With Dichroic Layer Or Air Gap Between Prism Sections Patents (Class 348/338)
  • Patent number: 10809539
    Abstract: An illumination apparatus includes first and second laser light source units, each of which is configured by juxtaposing a plurality of laser light sources in an array, and which are provided to oppose each other. The illumination apparatus further includes first and second reflecting members. The second reflecting member has a first gap and is divided into first and second reflecting portions, and the first reflecting member is disposed so as to pass through the first gap. A second outgoing light beam transmitted through a transmitting region of the first reflecting member and a fourth outgoing light beam transmitted through a transmitting region of the second reflecting member are reflected in an output light direction by a reflecting region of the second reflecting member and a reflecting region of the first reflecting member, respectively.
    Type: Grant
    Filed: April 4, 2019
    Date of Patent: October 20, 2020
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Shigekazu Yamagishi, Yuki Yamagata
  • Patent number: 10663849
    Abstract: A polarization beam splitter includes: a first prism; a second prism; a polarization beam split portion in contact with the second prism; a substrate provided between the polarization beam split portion and the first prism; a first adhesive portion provided between the first prism and the substrate; and a second adhesive portion provided between the polarization beam split portion and the substrate.
    Type: Grant
    Filed: September 25, 2018
    Date of Patent: May 26, 2020
    Assignee: CANON KABUSHIKI KAISHA
    Inventor: Yuuki Maeda
  • Patent number: 10018553
    Abstract: The present set of embodiments relate to a system, method, and apparatus for an optical configuration in a flow cytometer that allows for independent adjustment of focusing for each light source. Such systems, methods, and apparatuses require a final focusing element to be moved near the beginning of the optical train and for each optical element coming after the final focusing element to be configured to accommodate converging light beams while minimizing the introduction of aberrations into those beams.
    Type: Grant
    Filed: June 26, 2017
    Date of Patent: July 10, 2018
    Assignee: LIFE TECHNOLOGIES CORPORATION
    Inventors: Gregory Kaduchak, Wesley Smith, Michael Ward
  • Patent number: 9885873
    Abstract: The present invention provides a color separation optical system which separates an entrance ray into at least three rays of a first color light, a second color light, and a third color light being different color lights and which guides the three rays respectively to solid-state image pickup elements disposed on different optical paths, the system including a first prism, a second prism, a third prism, and an absorption filter disposed between a second exit surface of the second prism and a third entrance surface of the third prism and configured to absorb the second color light. The third entrance surface of the third prism or a surface of the absorption filter facing the third entrance surface is provided with a second dichroic film which reflects the second color light and transmits the third color light.
    Type: Grant
    Filed: August 2, 2016
    Date of Patent: February 6, 2018
    Assignee: CANON KABUSHIKI KAISHA
    Inventor: Ryuji Ohmuro
  • Patent number: 9696554
    Abstract: A color separation optical assembly (3) of an image capture device (1) includes, in order from a light incidence side, a first prism (10) which has a first dichroic film (D1) and extracts blue light (LB) reflected by the first dichroic film, a second prism (20) which has a second dichroic film (D2) and extracts red light (LR) transmitted through the first dichroic film and reflected by the second dichroic film, and a third prism (30) which extracts green light (LG) transmitted through the first and second dichroic films. The first dichroic film is a multiband dichroic film which reflects light of an infrared region from a long wavelength side of a red region.
    Type: Grant
    Filed: February 26, 2016
    Date of Patent: July 4, 2017
    Assignees: FUJIFILM Corporation, JAPAN BROADCASTING CORPORATION, IKEGAMI TSUSHINKI CO., LTD.
    Inventors: Arihiro Saita, Yuichi Sawahata, Kenichiro Masaoka, Yukihiro Nishida, Osamu Ozawa
  • Patent number: 9022580
    Abstract: This invention realizes an illumination optical system with a small etendue that has a longer lifetime and a high degree of brightness. The invention includes: a laser light source that generates excitation light; a phosphor that generates a fluorescent light by means of the excitation light; a light tunnel that projects the excitation light that is incident at one end towards the phosphor from another end, and projects a fluorescent light generated with the phosphor from the one end; and a dichroic mirror that is provided between the laser light source and the light tunnel, and that allows the fluorescent light or the excitation light to pass through, and reflects the remaining excitation or fluorescent light.
    Type: Grant
    Filed: January 29, 2010
    Date of Patent: May 5, 2015
    Assignee: NEC Display Solutions, Ltd.
    Inventors: Hiroyuki Saitou, Atsushi Katou, Motoyasu Utsunomiya, Akihiro Osaka, Masateru Matsubara
  • Patent number: 8982210
    Abstract: A vehicle including a scanning imaging system includes a vehicle body having an outer surface, a propulsion source, and an optical window secured to the outer surface of the vehicle positioned on an optical axis for transmitting electromagnetic radiation received from a portion of an area of interest to the scanning imaging system. The scanning imaging system includes a first achromatic prism pair having prisms with different materials that have different refractive properties, and a second achromatic prism pair having prisms with different materials that have different refractive properties, both positioned on the optical axis. A camera fixed in location is optically coupled to form images from the electromagnetic radiation after being bent by the achromatic prism pairs. A motor including a controller independently rotates the first and second achromatic prism pairs about the optical axis for scanning within the area of interest.
    Type: Grant
    Filed: June 30, 2010
    Date of Patent: March 17, 2015
    Assignee: Lockheed Martin Corporation
    Inventors: James A. Fry, William H. Barrow, Robert J. Murphy
  • Patent number: 8310765
    Abstract: A color separating optical system including first to third prisms for separating incident light from an objective lens into three primary color light components, so as to project three color-separated images of a subject onto first to third image sensors, respectively. In order to prevent ghosts from being superposed on a center area of an image frame, the color separating optical system satisfies the condition: ??(?m+?m+1)/2, wherein “?” represents a tilt angle of a second dichroic film on the second prism to a perpendicular plane to an optical axis of the objective lens, and “?m” a diffraction angle of the second light component diffractively reflected from the second image sensor and reentering the second prism.
    Type: Grant
    Filed: July 20, 2011
    Date of Patent: November 13, 2012
    Assignee: Fujifilm Corporation
    Inventor: Arihiro Saita
  • Patent number: 8144237
    Abstract: An image pickup optical system including: a first prism including: a first incident surface where subject beam enters; a division surface for dividing the beam from the first incident surface into image-pickup beam and focus-detection beam; and a first exit surface from which reflection beam reflected on the division surface, the image-pickup beam or the focus-detection beam, exits; and a second prism including: a second incident surface on which transmission beam passing through the division surface, the image-pickup beam or focus-detection beam, enters; and a second exit surface from which the transmission beam exits, wherein the reflection beam is reflected on the division surface, reflected on the first incident surface, and reflected on the division surface to reach the first exit surface, and satisfying 0.1<DA/DB<0.5, where DA and DB indicate beam diameters of beams toward the image pickup elements for focus detection and for image pickup.
    Type: Grant
    Filed: January 27, 2010
    Date of Patent: March 27, 2012
    Assignee: Canon Kabushiki Kaisha
    Inventors: Yu Inomoto, Ryuji Ohmuro
  • Patent number: 8057048
    Abstract: A projector includes an optical arrangement and a cooling arrangement. The optical arrangement includes a light source, a filtering component, a light modulation component and a projection lens. The filtering component filters the light emitted by the light source. The light modulation component modulates the light filtered by the filtering component to form an image. The projection lens projects the image formed by the light modulation component. The cooling arrangement is arranged relative to the optical arrangement to cool the optical arrangement. The cooling arrangement includes a blower, an air duct and a heat sink. The blower blows cooling air. The air duct guides the cooling air from the blower to the filtering component along an cooling air path. The heat sink is disposed in the cooling air path within the air duct and fixedly attached to the light modulation component to thermally contact with the light modulation component.
    Type: Grant
    Filed: November 20, 2008
    Date of Patent: November 15, 2011
    Assignee: Funai Electric Co., Ltd.
    Inventor: Masakazu Suzuki
  • Patent number: 8040611
    Abstract: It is disclosed that a color separation optical system improves color reproducibility by obtaining a characteristic which approximates an ideal spectral characteristic in view of influence of polarization separation caused according to the magnitude of an incidence angle. In the color separation optical system, a curve representing a characteristic of a green-reflecting dichroic film DG has a shape along the characteristic curve representing an ideal spectral characteristic corresponding to green light. Further, the characteristic of the blue-reflecting dichroic film DB is associated with that of the green-reflecting dichroic film DG. A part, in which the transmittance of the blue-reflecting dichroic film DB changes from a low transmittance to a high transmittance, in the transmittance characteristic curve representing the characteristic of the blue-reflecting dichroic film DB is included in a predetermined wavelength region associated with the characteristic of the green-reflecting dichroic film DG.
    Type: Grant
    Filed: September 11, 2008
    Date of Patent: October 18, 2011
    Assignee: Fujinon Corporation
    Inventors: Arihiro Saita, Shuji Akiya
  • Patent number: 7967443
    Abstract: A projection system comprising a first imaging component, at least a second imaging component, and a color combiner. The first and second imaging components each comprise an imager and a reflective polarizer that is configured to at least partially separate a light beam from the imager into a first portion and second portion, where the first portion and the second portion have substantially orthogonal polarization states. The first portions of the light beams are directed in the same direction above or below a plane defined by the second portions of the light beams. The color combiner is configured to combine the second portions of the light beams, where the second portions of the light beams have substantially orthogonal polarization states prior to entering the color combiner.
    Type: Grant
    Filed: January 21, 2010
    Date of Patent: June 28, 2011
    Assignee: 3M Innovative Properties Company
    Inventors: Jiaying Ma, Gregory E. Gilligan
  • Patent number: 7916203
    Abstract: An image capture apparatus is provided. The image capture apparatus includes a prism that separates light incident through a lens into at least two color components of light to be output and an image capture device that converts light separated by and output from the prism into a captured image signal. The image capture apparatus includes a fixing plate attached to the image capture device mounted on a substrate. In addition, the image capture apparatus includes a plurality of fixing members for fixing an unattached surface of the fixing plate, which is unattached to the image capture device, on a side surface of the prism through an adhesive.
    Type: Grant
    Filed: October 11, 2007
    Date of Patent: March 29, 2011
    Assignee: Sony Corporation
    Inventors: Kiyoshi Harada, Shinji Takemoto, Masahito Kikuchi, Shohei Abe
  • Patent number: 7839571
    Abstract: A curve representing a characteristic of a blue-light reflecting dichroic film DB and a curve representing a characteristic of a red-light reflecting dichroic film DR are configured to have shapes that track an ideal spectral characteristic of green. Accordingly, it is possible to obtain a characteristic approximated to the ideal spectral characteristic without using a trimming filter having a dichroic film in an exiting surface of a prism. Since it is not necessary to use the trimming filter having the dichroic film, it is possible to prevent ghost and flare from occurring due to the dichroic film of the trimming filter. Accordingly, it is possible to embody an imaging apparatus having the ideal spectral characteristic with ghost and flare being reduced.
    Type: Grant
    Filed: March 17, 2008
    Date of Patent: November 23, 2010
    Assignee: Fujinon Corporation
    Inventors: Arihiro Saita, Shuji Akiya, Etsuo Terayama
  • Patent number: 7839428
    Abstract: Spectral Band Separation (SBS) modules including at least one dichroic element for imaging at least two different still or video images along non co-directional lines of sight for imaging purposes including inter alia displaying multiple 2D images, displaying Extended Field Of View (EFOV) images, stereoscopic imaging, 3D image rendering, and the like. The SBS modules can be implemented as discrete optical attachments for mounting on a color camera module or alternatively can be integrally formed therewith.
    Type: Grant
    Filed: January 29, 2006
    Date of Patent: November 23, 2010
    Inventor: Uri Neta
  • Patent number: 7697056
    Abstract: An exemplary digital camera module (200) includes a lens module (20), a chip package (30) and a focusing structure (40). The lens module includes a holder (24) and a barrel slidably received in the holder. At least one lens element (222) is fixed in the barrel. The holder has several channels (246) defined therein. Each channel respectively has an enlarged end opening (2468) and receives a corresponding wire (28) therein. The focusing structure is attached to the holder. Several pads (36) are formed on the surface of the chip package. Each wire electrically connects with a given pad using a conductive adhesive (52), and, via such a connection, the chip package is able to control the focusing structure to drive movement of the barrel. The respective enlarged end openings serve to help retain the corresponding conductive adhesive proximate/adjacent a given pad.
    Type: Grant
    Filed: March 16, 2007
    Date of Patent: April 13, 2010
    Assignee: Hon Hai Precision Industry Co., Ltd.
    Inventor: Shih-Lung Huang
  • Patent number: 7673993
    Abstract: A projection system comprising a first imaging component, at least a second imaging component, and a color combiner. The first and second imaging components each comprise an imager and a reflective polarizer that is configured to at least partially separate a light beam from the imager into a first portion and second portion, where the first portion and the second portion have substantially orthogonal polarization states. The first portions of the light beams are directed in the same direction above or below a plane defined by the second portions of the light beams. The color combiner is configured to combine the second portions of the light beams, where the second portions of the light beams have substantially orthogonal polarization states prior to entering the color combiner.
    Type: Grant
    Filed: December 22, 2005
    Date of Patent: March 9, 2010
    Assignee: 3M Innovative Properties Company
    Inventors: Jiaying Ma, Gregory E. Gilligan
  • Patent number: 7641346
    Abstract: A transmissive LCD is placed in optical series with pixels of an image. The transmissive LCD is set to full transmissivity when bright pixels of the image pass through the transmissive LCD. Transmissivity is decreased where pixels darker than a darkening threshold pass through the transmissive LCD. A darkening curve representative of an amount of darkening performed by the transmissive LCD provides an amount of darkening to be performed on each pixel. Preferably, the darkening curve gradually darkens pixels more as the pixels themselves are darker. The darkening curve may be implemented as a formula or a look-up table in software or drive electronics that energize the transmissive LCD. Both the darkening threshold and the darkening curve may be user selectable.
    Type: Grant
    Filed: January 22, 2007
    Date of Patent: January 5, 2010
    Assignee: LightMaster Systems, Inc.
    Inventor: Arthur Berman
  • Patent number: 7612822
    Abstract: A multispectral image capturing apparatus has different spectral sensitivity characteristics of at least four bands. Three primary bands of the at least four bands have spectral sensitivity characteristics of standard RGB. At least one auxiliary band of the rest of the at least four bands excluding the three primary bands has a spectral sensitivity characteristic of a narrower bandwidth than bandwidths of the RGB.
    Type: Grant
    Filed: May 3, 2006
    Date of Patent: November 3, 2009
    Assignee: Olympus Corporation
    Inventors: Takeyuki Ajito, Toru Wada, Yasuhiro Komiya
  • Patent number: 7575325
    Abstract: An image displaying apparatus is capable of maintaining the contrast ratios of displayed images even if the f-value of an optical system of the apparatus is lowered to provide bright images, efficiently utilizing a beam from a light source, minimizing the size and weight of the optical system, and being easy to manufacture. The image displaying apparatus includes first to third reflective polarizing plates (120, 121, 122) provided for first to third reflective spatial light modulators (130, 131, 132), respectively. The reflective polarizing plates polarize and separate beams to be injected into the reflective spatial light modulators. In the image displaying apparatus, a color separating optical system has a larger effective diameter than a color composition prism (140).
    Type: Grant
    Filed: February 1, 2007
    Date of Patent: August 18, 2009
    Assignee: Victor Company of Japan, Limited
    Inventors: Tetsuji Suzuki, Satoru Moriya
  • Patent number: 7553025
    Abstract: A polarization splitting section has a structure in that a polarization splitting layer is formed of a light reflecting grid member which is arranged in a grid-shaped pattern on an optically-transparent substrate, and an optically-transparent medium is filled between the grid member and the substrate in contact with the grid member surface and the substrate surface, and the grid member and the filled optically-transparent medium are bonded to the substrate with another adhesive agent or tackiness agent formed of an optically-transparent medium interposed. The polarization splitting layer is partly protruded externally from the surfaces of prism materials.
    Type: Grant
    Filed: April 20, 2006
    Date of Patent: June 30, 2009
    Assignee: Hitachi, Ltd.
    Inventors: Koji Hirata, Masahiko Yatsu
  • Patent number: 7515194
    Abstract: An image pickup optical system includes, in order from the object side, a front unit having at least one reflecting surface with power that is rotationally asymmetrical, an aperture stop, and a rear unit having at least one reflecting surface with power that is rotationally asymmetrical. In this case, F-numbers in two directions perpendicular to each other on a plane perpendicular to the optical axis are different. Decentration takes place in one of the two directions and the F-number in a direction perpendicular to a decentering direction is smaller than that in the decentering direction. When the F-number in the decentering direction is represented by FNY and the F-number in the direction perpendicular to the decentering direction is represented by FNX, the optical system satisfies the following condition: 1.1<FNY/FNX<2.0.
    Type: Grant
    Filed: July 30, 2004
    Date of Patent: April 7, 2009
    Assignee: Olympus Corporation
    Inventors: Tetsuo Nagata, Tomoko Sato, Akihiro Sakurai, Tetsuya Ishii, Takeshi Takahashi, Kazuhiro Matsumoto
  • Patent number: 7411734
    Abstract: A color-splitting optical element is disclosed that includes a first prism having a first transmissive curved outer side, a second transmissive curved outer side and an inner side. The color-splitting optical element also includes a second prism having a first transmissive curved outer side, a second side and an inner side. A dichroic element is disposed between the inner side of the first prism and the inner side of the second prism. The first transmissive curved outer side of the first prism is disposed generally opposite the first transmissive curved outer side of the second prism along a first direction and the second transmissive curved outer side of the first prism is disposed generally opposite the second side of the second prism along a second direction. Also disclosed are optical systems utilizing such color-splitting optical elements.
    Type: Grant
    Filed: November 10, 2005
    Date of Patent: August 12, 2008
    Assignee: 3M Innovative Properties Company
    Inventors: Simon Magarill, Stephen K. Eckhardt
  • Patent number: 7400452
    Abstract: Frames are used to hold and/or position components in precise positions in a prism assembly. The frames may be constructed using any of side caps, air gaps, recesses, and hold either a single or multiple planar components. The frames are, for example, immersed in liquid filled channels between adjacent faces of beamsplitters in the prism assembly. The planar components themselves may include waveplates, optical flats, spacer glasses, retarders, Color Selects, substrates, or any other components of the optical device. The planar components may themselves include multiple layers (e.g., polarizers, dichroics, etc). In one embodiment, a polarizer and an air gap are provided. The invention increases precision, lowers cost, and improves quality (e.g., contrast ratio) of any number of devices, but is particularly applicable to Liquid Crystal on Silicon (LCOS) and other microdisplay based projection systems such as High Definition (HD) Rear Projection Televisions (RPTVs).
    Type: Grant
    Filed: October 18, 2005
    Date of Patent: July 15, 2008
    Assignee: LightMaster Systems, Inc.
    Inventors: Mike Detro, Ken Bradley, Arthur Berman
  • Patent number: 7271961
    Abstract: A cross dichroic prism color-synthesizes a plurality of color lights having entered therein separately and emits color-synthesized light to a projection lens. The cross dichroic prism includes a first dichroic film; and a second dichroic film intersecting the first dichroic film so as to pass through the first dichroic film. The cross dichroic prism is configured so that a color light having entered the cross dichroic prism and having become diffracted at a gap created in the first dichroic film over an area where the second dichroic film passes through the first dichroic film is not projected through the projection lens.
    Type: Grant
    Filed: March 17, 2006
    Date of Patent: September 18, 2007
    Assignee: Nikon Corporation
    Inventors: Yuji Manabe, Kiyoshi Numazaki, Hisao Oozeki, Tomoko Hattori, legal representative, Tetsuo Hattori, deceased
  • Patent number: 7267443
    Abstract: Exemplary embodiments of the invention provide a projector that can readily correct for chromatic aberration caused by, for example, a projecting lens without having to give a cross dichroic prism, for example, a special preliminary process. Illumination-light components modulated by corresponding liquid-crystal light valves are synthesized in a cross dichroic prism (27) to form image light. The image light enters a projecting lens (29) from which the image light is projected onto a screen, which is not shown in the drawings. In the cross dichroic prism (27) used to synthesize light components, a first prism element (P1) has a refractive index higher than that of remaining prism elements (P2, P3 and P4). This allows a width of a red projection-image component to be made larger than widths of projection-image components of remaining colors, whereby the chromatic aberration in the projecting lens can be readily corrected.
    Type: Grant
    Filed: February 28, 2005
    Date of Patent: September 11, 2007
    Assignee: Seiko Epson Corporation
    Inventors: Hidemasa Yamakawa, Akitaka Yajima
  • Patent number: 7137705
    Abstract: A cross dichroic prism as a color-combining optical device and optical modulators constituting an optical device body are fixed with insulating pins being interposed. The optical device body includes a base and reinforcing members, supporting surfaces for supporting and fixing the reinforcing members are formed at a heat conductive member constituting the base. The reinforcing members are supported by the supporting surfaces of the heat conductive member, and also support and fix the optical modulators so as to enhance fixing state of the optical modulators relative to the cross dichroic prism. With this arrangement, an optical device as well as a projector, in which the connecting state of the optical modulators relative to the color-combining optical device can be strengthened so as to form a fine optical image without pixel deviation, can be provided.
    Type: Grant
    Filed: August 24, 2004
    Date of Patent: November 21, 2006
    Assignee: Seiko Epson Corporation
    Inventor: Masashi Kitabayashi
  • Patent number: 6956551
    Abstract: Device comprising: matrices of reflecting elements which can be electrically driven, and means for deconstructing a beam of polychromatic light and means for reconstructing complementary reflected beams, comprising two dichroic filters with a gradient where, for at least one of these filters, the direction of the gradient HOG, H?OG? makes an angle of inclination of non-zero gradient ?, ?? with a plane (DOE, D?OE?) orthogonal to the reflecting surfaces of the matrices. By virtue of the inclination of the gradient, the chromatic performance of the device is substantially improved.
    Type: Grant
    Filed: July 25, 2002
    Date of Patent: October 18, 2005
    Assignee: Thomson Licensing
    Inventors: Jean-Jacques Sacre, Nicolas Pitaval
  • Patent number: 6923545
    Abstract: A measurement light (X) is introduced on either one of reflection surfaces (501, 502, 511, 512) to detect a returned light (Y) reflected by the reflection surfaces (501, 502, 511, 512), reflected by a reflecting device and again reflected by the reflection surfaces (501, 502, 511, 512) by an autocollimator (620) to conduct image-processing and calculation by a processor (628), where a position adjuster (690) adjusts an attitude of a cross dichroic prism (45) relative to a fixing plate (447) to eliminate deviation between a position of the measurement light (X) and the returned light (Y) based on the result of the processing, thereby producing a highly accurate prism unit (50).
    Type: Grant
    Filed: March 11, 2003
    Date of Patent: August 2, 2005
    Assignee: Seiko Epson Corporation
    Inventor: Masashi Kitabayashi
  • Patent number: 6909556
    Abstract: Kernels are designed in different configurations based on design properties of an enclosure or other requirements. A prism assembly having various types of filters, waveplates, beam splitters (e.g., path length matched beam splitters) and/or other optical components are provided to selectively direct light beams to each of red, green, and blue microdisplays that manipulate the light and then combine the manipulated lights into an output image. The prism assembly includes an input face, an output face, and other faces on which the microdisplays are attached in a number of different configurations. Requirements and exact placement of optical components varies depending on which microdisplay is attached to which face. The components of the prism assembly may be arranged in path length matched positions.
    Type: Grant
    Filed: January 13, 2003
    Date of Patent: June 21, 2005
    Assignee: LightMaster Systems, Inc.
    Inventors: Arthur Berman, Michael Detro
  • Patent number: 6903774
    Abstract: A thin viewfinder device includes, in order an object side to a viewing eye side, a first prism, and a second prism disposed separately from the first prim across an air gap. The first prism, the air gap and the second prism are arranged in such a manner that an object light flux obtained within a viewing field passes through the first prism, the air gap and the second prism so as to reach the viewing eye, while an object light flux obtained outside the viewing field is totally reflected by surfaces of the first prism so as to be prevented from reaching the viewing eye.
    Type: Grant
    Filed: March 14, 2001
    Date of Patent: June 7, 2005
    Assignee: Canon Kabushiki Kaisha
    Inventor: Yasuo Suda
  • Patent number: 6671101
    Abstract: Provided are a color combining optical element capable of forming a good projected image on a screen surface while permitting scaling-down of entire apparatus and a projection image display apparatus using it.
    Type: Grant
    Filed: April 6, 2001
    Date of Patent: December 30, 2003
    Assignee: Canon Kabushiki Kaisha
    Inventor: Saburo Sugawara
  • Patent number: 6667656
    Abstract: In a color separating optical system, a first filter adapted to eliminate from light emitted from a red light exit face a light component in a wavelength range longer than a longer-wavelength-side boundary wavelength of a red visible light wavelength region is disposed at a prism surface in an optical path for guiding red region light, whereas a second filter adapted to reflect a light component in a wavelength range longer than a reference wavelength which is longer than the longer-wavelength-side boundary wavelength by a predetermined wavelength but transmit therethrough a light component in a wavelength region shorter than the reference wavelength is placed at the red light exit face.
    Type: Grant
    Filed: May 24, 2002
    Date of Patent: December 23, 2003
    Assignee: Fuji Photo Optical Co., Ltd.
    Inventor: Arihiro Saita
  • Patent number: 6549338
    Abstract: A color splitting prism assembly (100) comprised of three prisms. Each a dichroic filter at an interface (112) between a first and second of the three prisms reflects a first primary color component of a white light beam passing through the prism assembly. The first primary color component is directed to a first modulator (118). The remaining portions of the white light beam enter a second prism (108) and strike a second dichroic filter at the interface between (124) the second and third prisms. The second dichroic filter separates a second primary color component from the white light beam leaving a third primary color component to travel through the third prism (110) to a third modulator. The second primary color component of the white light beam is directed to a second modulator (128).
    Type: Grant
    Filed: November 7, 2000
    Date of Patent: April 15, 2003
    Assignee: Texas Instruments Incorporated
    Inventors: Gary Wolverton, Duane Scott Dewald, N. Jack Gregory, Roger Carver
  • Patent number: 6542193
    Abstract: In a TV camera main body, a still-image-luminous-flux-decomposing prism is disposed adjacent to a color-decomposing prism of a TV-image-capturing system, whereby still images whose aberration is favorably corrected as with TV images are obtained in a simple and compact configuration. A mechanical shutter is disposed in an optical path of the still-image-capturing system, so as to prevent image blurring and smear from occurring due to temporal shifts between field images. A four-block color-decomposing prism 11A, in which each glass prism has a form identical to a color-decomposing prism of a dual green type, is constituted by a still-image-capturing prism 2d, and a TV-image-capturing three-color-decomposing prism system comprising a prism for blue 2a, a prism for red 2b, and a prism for green 2c. A mechanical shutter 34 is disposed between the light exit end face 7d of the still-image-capturing prism 2d and its cover glass 6d.
    Type: Grant
    Filed: January 15, 1999
    Date of Patent: April 1, 2003
    Assignee: Fuji Photo Optical Co., Ltd.
    Inventors: Kazuo Yoshikawa, Takami Hasegawa
  • Patent number: 6342980
    Abstract: A beam splitting prism system includes, at least, a first prism for extracting a first light beam along an advancing direction of a light beam coming from an objective lens, an air separation, and a second prism having a predetermined apical angle and having a reflecting surface for extracting a second light beam, wherein the second prism is arranged to cause the second light beam reflected by the reflecting surface to be totally reflected by a surface of the second prism adjacent to the air separation and then exit from the second prism, and the apical angle of the second prism is set such that interference fringes which occur due to reflection of the second light beam by a solid-state image sensor disposed within the optical path of the second light beam do not overlap in a central portion of an image plane of the solid-state image sensor disposed within the optical path of the second light beam.
    Type: Grant
    Filed: March 16, 2000
    Date of Patent: January 29, 2002
    Assignee: Canon Kabushiki Kaisha
    Inventor: Ryuji Omuro
  • Publication number: 20020008770
    Abstract: A color separation beam splitter for projectors is provided, which comprises a plurality of prisms connected with each other and three optical interference filters having different wavelength ranges respectively formed on side surfaces of the plurality of prisms. The three optical interference filters include a yellow color reflective dichroic mirror, a red color reflective dichroic mirror, and a blue color reflective dichroic mirror to filter out the yellow light and provide three primary color lights with high color purity. Moreover, by reflecting a light beam twice, the number of layers of dichroic mirror can be reduced. The color purity of the light is increased after reflected twice by the dichroic mirrors. Moreover, configuration of a liquid crystal projector by use of this prism assembly as color separation unit is also disclosed.
    Type: Application
    Filed: December 28, 2000
    Publication date: January 24, 2002
    Inventors: Fang Chuan Ho, Cheng-Wei Chu
  • Patent number: 6330113
    Abstract: A color-separation prism assembly comprises first, second and third prisms. The first and second prisms have entrance surfaces, exit surfaces, and partially-reflecting surfaces, wherein the entrance surface of the second prism is separated by an air gap from the partially-reflecting surface of the first prism. The third prism has an entrance surface and an exit surface, wherein the entrance surface of the third prism is adjacent to the partially-reflecting surface of the second prism. The first prism has a cut-out serving as a flare-stop stop, and providing relief so as to allow the entrance surface of the third prism to slide across a plane disposed over the cut-out into a volume defined by the cut-out. The plane is formed as an extension of the partially-reflecting surface of the first prism. An optical axis passes through the first, second and third prisms. The optical axis passes at normal angles through the entrance surface of the first prism, and the exit surfaces of the first, second and third prisms.
    Type: Grant
    Filed: September 28, 2000
    Date of Patent: December 11, 2001
    Assignee: Foveon, Inc.
    Inventors: Timothy M. Slagle, Richard F. Lyon, Mitchell C. Ruda, Tilman W. Stuhlinger
  • Patent number: 6144498
    Abstract: A color separation device useful in information display systems is assembled from three prisms in an arrangement that provides for air equivalent thickness adjustment for each color. The air equivalent thickness adjustment provides for the correction of deviations in any of the three prisms, as well as providing a method to correct for the chromatic aberration arising from other optical elements in the information display system. The color separation device improves image quality and provides opportunities to lower the display system cost by using low tolerance components and/or plastic optical components normally having a high chromatic aberration.
    Type: Grant
    Filed: May 27, 1999
    Date of Patent: November 7, 2000
    Assignee: Optical Coating Laboratory, Inc.
    Inventors: Brett J. Bryars, Blain J. Hendrix
  • Patent number: 5777674
    Abstract: A color separation prism in which are arranged, in the order according to the direction in which the light from the objective travels: a first prism which extracts a predetermined wavelength component; a first air gap; a second prism which extracts a predetermined wavelength component; a second air gap; and third and fourth prisms that are joined to each other, wherein, in particular, a light reflected by the joint plane is totally reflected by a surface adjacent the second air gap and guided to an image pickup device.
    Type: Grant
    Filed: April 10, 1995
    Date of Patent: July 7, 1998
    Assignee: Canon Kabushiki Kaisha
    Inventor: Ryuji Ohmuro
  • Patent number: 5760832
    Abstract: An image forming optical system comprises interchangeable lens 14 of a single lens reflex camera and reduction relay optical system 15. A three-color separating prism 16 that separates the photo image into two green photo images (G1 and G2) and a red/blue photo image (R/B) is located behind the image forming optical system, and CCDs 19 through 17 that perform image sensing as to RB, G2 and G1 photo images are located behind the transparent surfaces of prisms 16a through 16c, respectively. G1 CCD 17 and RB CCD 19 perform image sensing for the same photo image area while G2 CCD 18 performs image sensing for a photo image area which is offset by distance .sqroot. {(PH/2).sup.2 +(PV/2).sup.2 } (PH: lateral pixel pitch, PV: vertical pixel pitch) in the lower right direction relative to G1 CCD 17.
    Type: Grant
    Filed: December 11, 1995
    Date of Patent: June 2, 1998
    Assignee: Minolta Co., Ltd.
    Inventors: Mutsuhiro Yamanaka, Kazuchika Sato
  • Patent number: 5726709
    Abstract: An imaging apparatus comprises: a color separation optical system for separating an image ray into blue, green, and red image rays, image sensors, having pixels vertically and horizontally arranged, for receiving the image rays and producing blue, red, and green signals wherein at least one of image sensors for blue and red signals has a vertical relative offset against the image sensor for green signal to have a relative interlace relation with the image sensor for blue or red color signal, to produce a screen to be produced, having a higher resolution than these image sensors. A vertical high frequency component is operated from the blue and red signals and is added to the green color signal to produce a second green signal indicative of a green luminance value at a position corresponding to each pixel of the image sensors for blue and red color signals to increase the vertical resolution of the screen.
    Type: Grant
    Filed: December 30, 1996
    Date of Patent: March 10, 1998
    Assignee: Victor Company of Japan, Ltd.
    Inventors: Kosuke Kinoshita, Takashi Shinozaki, Takuya Tsushima, Masaji Yoshida, Hiroyuki Kitamura, Tetsuya Suwa
  • Patent number: 5640206
    Abstract: An imaging apparatus comprises: a color separation optical system for separating an image ray into blue, green, and red image rays, image sensors, having pixels vertically and horizontally arranged, for receiving the image rays and producing blue, red, and green signals wherein at least one of image sensors for blue and red signals has a vertical relative offset against the image sensor for green signal to have a relative interlace relation with the image sensor for blue or red color signal, to produce a screen to be produced, having a higher resolution than these image sensors. A vertical high frequency component is operated from the blue and red signals and is added to the green color signal to produce a second green signal indicative of is a green luminance value at a position corresponding to each pixel of the image sensors for blue and red color signals to increase the vertical resolution of the screen.
    Type: Grant
    Filed: May 30, 1995
    Date of Patent: June 17, 1997
    Assignee: Victor Company of Japan, Ltd.
    Inventors: Kosuke Kinoshita, Takashi Shinozaki, Takuya Tsushima, Masaji Yoshida, Hiroyuki Kitamura, Tetsuya Suwa
  • Patent number: 5313288
    Abstract: A recording medium has first and second transparent electrodes, a photoconductive layer member and a photomodulation member. The recordingmedium also has a first lamination member having a first substrate on which the first transparent electrode and the photoconductive layer member are laminated in order, a second lamination member having a second transparent substrate on which the second transparent electrode and the photomodulation layer member are laminated in order and coupling members for unifying the first and second lamination members together with a gap of specific width in such a manner that the photoconductive and photomodulation layer members face each other.
    Type: Grant
    Filed: March 4, 1992
    Date of Patent: May 17, 1994
    Assignee: Victor Company of Japan, Ltd.
    Inventors: Itsuo Takanashi, Shintaro Nakagaki, Tsutou Asakura, Masato Furuya, Yoshihisa Koyama, Yuji Uchiyama
  • Patent number: RE38740
    Abstract: The invention provides a dichroic prism capable of reducing displacements of projection pixels of colors caused by chromatic aberration of magnification. A dichroic prism is formed in the shape of a quadrangular prism as a whole by joining four rectangular prisms together. A red reflecting dichroic plane and a blue reflecting dichroic plane intersect to form substantially an X shape along junction surfaces of the prisms. The red reflecting dichroic plane is convex-shaped by partly changing the thickness of an adhesive layer for connecting the rectangular prisms together. Accordingly, since a red beam can be guided to a projection optical system while being enlarged, it is possible to reduce a projection image of the red beam to be projected onto a projection plane via the projection optical system. This makes it possible to reduce relative displacements of projection pixels of color beams caused by chromatic aberration of magnification.
    Type: Grant
    Filed: June 6, 2002
    Date of Patent: June 7, 2005
    Assignee: Seiko Epson Corporation
    Inventors: Toshiaki Hashizume, Akitaka Yajima