Projection Light Sources Patents (Class 352/198)
  • Patent number: 11240464
    Abstract: Dual or multi-modulation display systems comprising a first modulator and a second modulator are disclosed. The first modulator may comprise a plurality of analog mirrors (e.g. MEMS array) and the second modulator may comprise a plurality of mirrors (e.g., DMD array). The display system may further comprise a controller that sends control signals to the first and second modulator. The display system may render highlight features within a projected image by affecting a time multiplexing scheme. In one embodiment, the first modulator may be switched on a sub-frame basis such that a desired proportion of the available light may be focused or directed onto the second modulator to form the highlight feature on a sub-frame rendering basis.
    Type: Grant
    Filed: April 13, 2020
    Date of Patent: February 1, 2022
    Assignee: Dolby Laboratories Licensing Corporation
    Inventor: Martin J. Richards
  • Patent number: 10969674
    Abstract: A display system includes: a light source, a light modulator, a recovery device, and a light intensity adjustment device. The light source emits original light that is incident to the light modulator. The light modulator modulates, on the basis of image data of an image to be displayed, the light incident thereto so as to form image light and non-image light. The recovery device recovers the non-image light, and the recovered non-image light is incident to the light modulator. The light intensity adjustment device adjusts, on the basis of the intensity of the non-image light corresponding to the currently modulated image to be displayed, the intensity of the original light emitted by the light source, thus allowing total intensity of the original light and the recovered non-image light that are incident to the light modulator to be kept consistent in modulation periods for different images to be displayed.
    Type: Grant
    Filed: November 3, 2017
    Date of Patent: April 6, 2021
    Assignee: Appotronics Corporation Limited
    Inventors: Zuqiang Guo, Fei Hu, Yi Li
  • Patent number: 10768407
    Abstract: In one aspect, a light module is disclosed, which includes a housing providing a hollow chamber extending from a proximal end to a distal end, and a lens positioned in the hollow chamber, where the lens has a lens body comprising an input surface for receiving light from a light source and an output surface through which light exits the lens body, said lens further comprising a collar at least partially encircling said lens body. The light module further includes at least one shoulder on which the lens collar can be seated for positioning the lens within the housing. A light source, e.g., an LED, is coupled to the hollow chamber, e.g., at its proximal end, for providing light to the lens.
    Type: Grant
    Filed: November 18, 2019
    Date of Patent: September 8, 2020
    Assignee: Acera, LLC
    Inventors: Thomas V. Root, Thomas Davis, Michael Cook, Carlton Jones, David Leo, Michael S. Epstein
  • Patent number: 10216092
    Abstract: A light source apparatus including a light source configured to emit a light flux from an emission region having a predetermined size and a rotationally symmetrical emission intensity distribution; and a condenser configured to condense the light flux to allow the light flux to exit to the outside. The condenser is rotationally symmetrical about an optical axis and is disposed to surround the emission region, and has four or more reflection mirrors each having a reflecting surface for reflecting the light flux emitted from the emission region. The reflection mirrors include elliptical surface reflection mirrors where the reflecting surface is elliptical and spherical surface reflection mirrors where the reflecting surface is spherical, and are alternately arranged in the direction of the optical axis, and a light flux reflected by one spherical surface reflection mirror is further reflected by one elliptical surface reflection mirror oppositely disposed across the emission region.
    Type: Grant
    Filed: January 6, 2017
    Date of Patent: February 26, 2019
    Assignee: CANON KABUSHIKI KAISHA
    Inventor: Haruna Kawashima
  • Patent number: 10113706
    Abstract: A lighting device with a laser light source, a deflecting reflector positioned at an angle to the laser light source, and a lens for focusing light from the laser light source to the deflecting reflector. In another embodiment, the lighting device includes only the laser light source and a lens arranged in the main radiation direction in front of the laser light source.
    Type: Grant
    Filed: August 13, 2014
    Date of Patent: October 30, 2018
    Assignee: Hella GmbH & Co. KGaA
    Inventor: Martin Mügge
  • Patent number: 10088638
    Abstract: An optical fiber connection mechanism includes a pair of connectors and a split sleeve that are used in an endoscope. The connectors include respective ferrules, an end of a single-mode optical fiber and a collimator lens is mounted in each ferrule, and the collimator lens is disposed at the tip of the single-mode optical fiber. The optical fiber connection mechanism is configured so that when the ferrules are inserted into ends of the split sleeve, the collimator lenses face each other with a gap therebetween and the single-mode optical fibers are optically connected to each other. The ferrules are loosely fit in the corresponding connectors to be displaceable within a predetermined range in the direction along the optical axis of the single-mode optical fibers.
    Type: Grant
    Filed: May 23, 2017
    Date of Patent: October 2, 2018
    Assignee: OLYMPUS CORPORATION
    Inventor: Hiroyoshi Yajima
  • Patent number: 9447931
    Abstract: Methods and apparatus related to an LED-based lighting unit (10, 110) having an optical component for mixing light output from a plurality of LEDs (34, 134). In some embodiments the optical component may include at least one reflective surface interiorly thereof and the LEDs (34, 134) may be vertically arranged about the reflective surface. At least some of the LEDs (34, 34) may generate a light output generally directed toward the reflective surface. The reflective surface may be configured to direct at least some of the light output directly incident thereon through a light output opening (25, 125) of the optical component.
    Type: Grant
    Filed: June 19, 2012
    Date of Patent: September 20, 2016
    Assignee: KONINKLIJKE PHILIPS N.V.
    Inventors: Brian Roberge, Eric Anthony Roth, Dirk Fieberg, Joseph Henri Aubin
  • Patent number: 8953095
    Abstract: The invention provides a flash light device, which includes a light source, a light diffuser and a light diffuser's driving unit. The light diffuser's driving unit provides the light diffuser with a required driving voltage according to a voltage information, in which the voltage information is determined according to an original image without light-complementing of the light source and a pre-flash image with light-complementing of the light source.
    Type: Grant
    Filed: June 21, 2012
    Date of Patent: February 10, 2015
    Assignee: Altek Corporation
    Inventor: Ming-Jiun Liaw
  • Patent number: 8558480
    Abstract: A driving method for a light source apparatus for a projector using a single plate, comprises a step of supplying lamp current at a predetermined frequency to an extra-high pressure mercury lamp, a step of reversing a polarity of the lamp current to be supplied to the extra-high pressure mercury lamp, when one of boundaries between color areas of the color wheel is located at a light condensing area, and a step of supplying a low frequency current to the extra-high pressure mercury lamp at predetermined intervals, wherein the low frequency current starts to be supplied when a boundary from which a color area is changed to a predetermined color area is located at the light condensing area, and wherein the low frequency current continues to be supplied for a duration corresponding to the integer number of color areas of the color wheel.
    Type: Grant
    Filed: March 6, 2009
    Date of Patent: October 15, 2013
    Assignee: Ushio Denki Kabushiki Kaisha
    Inventor: Katsumi Sugaya
  • Publication number: 20090251667
    Abstract: A color adjusting method is applied to a projector. The projector has a light emitting element and a color wheel. The light emitting element supplies light, and makes the light pass through the color wheel so as to generate a plurality of different color lights. These different color lights are used to form a color image. The color adjusting method includes the steps of providing a plurality of driving waveforms which is dynamically switched for driving the light emitting element; defining a major color light of the color image, which is selected from the different color lights; and switching to one of these driving waveforms when the major color light is generated by the light passing through the color wheel. Thus, the light energy of the major color light is enhanced by means of driving the light emitting element through the switched driving waveform.
    Type: Application
    Filed: March 5, 2009
    Publication date: October 8, 2009
    Applicant: Coretronic Corporation
    Inventors: Hsin-Chi Chen, Chih-Heng Fan Chiang, Yen-Hsiang Hung
  • Patent number: 7158207
    Abstract: A motion picture film projector including a lamp house section having a lamp bulb and a reflector; a head section located in front of the lamp house section; and an optical member located proximate a junction between the lamp house section and the head section. The optical member has infrared filtering coatings on both a front side and a rear side of the optical member. The reflector has a rear aperture with a portion of the lamp bulb extending therethrough. The rear aperture is larger than a center outer diameter of the lamp bulb. The lamp bulb and the reflector are sized and shaped such that an operator looking rearward from a front side of the lamp bulb and reflector can see a general ring shaped gap between the reflector and the lamp bulb when the lamp bulb is aligned relative to the reflector.
    Type: Grant
    Filed: February 27, 2004
    Date of Patent: January 2, 2007
    Inventor: Robert R Miniaci
  • Patent number: 6999071
    Abstract: The invention relates to a method for displaying three-dimensional images. In the method light beams (Le) are associated to several different screen points (P) of a screen (20). The light beams (Le) produce different views associated to different emission directions (E). The emission directions (E) are associated to the individual screen points (P). The light beams (Le) are generated by projecting light beams (Ld), according to the angle of the adjacent emitting directions. According to the invention, light beams (Le) without viewing direction information are generated, essentially simultaneously, with pixels (Cd) having different co-ordinates. These pixels (Cd) are pixels of a two-dimension display (50), and they are associated to different emitting directions (E) of the appropriate screen points (P).
    Type: Grant
    Filed: May 18, 2001
    Date of Patent: February 14, 2006
    Inventor: Tibor Balogh
  • Patent number: 6980276
    Abstract: A photosensor detecting light-emission quantity from a light-emission lamp is set up, in order to regulate the current supplied with the light-emission lamp from a power according to a light-quantity detecting signal from the photosensor, so as to make the light-emission quantity from the light-emission lamp constant. Projected light-quantity onto a movie film is regulated and an image obtained from a shooting section becomes an image having a good quality with a little flicker.
    Type: Grant
    Filed: March 16, 2005
    Date of Patent: December 27, 2005
    Assignee: Sony Corporation
    Inventors: Tadashi Okano, Kunika Hashimoto
  • Patent number: 6909489
    Abstract: A luminous source apparatus, an image projecting apparatus, and an image projection converting apparatus to prevent a projected image, or an electronic image obtained through electronization of the projected image from intensity variations. A photosensor detects the light-emission quantity from a light-emission lamp in order to regulate the current supplied with the light-emission lamp according to a light-quantity detecting signal from the photosensor, so as to make the light-emission quantity from the light-emission lamp constant. Projected light-quantity onto a movie film is regulated and an image obtained from a shooting section becomes an image having a good quality with a little flicker.
    Type: Grant
    Filed: July 23, 2003
    Date of Patent: June 21, 2005
    Assignee: Sony Corporation
    Inventors: Tadashi Okano, Kunika Hashimoto
  • Patent number: 6885428
    Abstract: A projection television has a unit for reflecting OFF light not advancing toward a screen of light emitted by a reflection type light modulating element and a unit for controlling the amount of the reflecting OFF light and returns the OFF light which has not been used in a conventional device to the light source to reuse the OFF light. This configuration increases the utilization efficiency of the light and, as a result, can realize a powerful projection television having a bright projection image.
    Type: Grant
    Filed: February 26, 2002
    Date of Patent: April 26, 2005
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Taketoshi Hibi, Akihisa Miyata
  • Patent number: 6501530
    Abstract: A motion picture film projector illumination system (100) for minimizing film buckle comprises a light source (405) for producing a beam of light (416). Beam shaping optics (411) focus the light beam onto a film through an aperture (408) having an aperture opening (410) corresponding to a film frame (324). A secondary beam steering optics (465) directs stray light around edges of the aperture to illuminate film edge to frame edge areas (446).
    Type: Grant
    Filed: November 30, 2000
    Date of Patent: December 31, 2002
    Assignee: Eastman Kodak Company
    Inventors: Andrew F. Kurtz, Joshua M. Cobb, Kenneth J. Repich
  • Publication number: 20020171807
    Abstract: A projection television has a unit for reflecting OFF light not advancing toward a screen of light emitted by a reflection type light modulating element and a unit for controlling the amount of the reflecting OFF light and returns the OFF light which has not been used in a conventional device to the light source to reuse the OFF light. This configuration increases the utilization efficiency of the light and, as a result, can realize a powerful projection television having a bright projection image.
    Type: Application
    Filed: February 26, 2002
    Publication date: November 21, 2002
    Inventors: Taketoshi Hibi, Akihisa Miyata
  • Publication number: 20020145703
    Abstract: Aluminous source apparatus, an image projecting apparatus, and an image projection converting apparatus are provided, so as to prevent a projected image, or an electronic image obtained through electronization of the projected image from intensity variations.
    Type: Application
    Filed: June 3, 2002
    Publication date: October 10, 2002
    Applicant: SONY CORPORATION
    Inventors: Tadashi Okano, Kunika Hashimoto
  • Patent number: 6412972
    Abstract: There is provided a digital light projection apparatus for projecting digitally selected light beams onto a stage display to create the effect of a continuously moving image. The apparatus has a fixed housing with a luminaire and a deformable micromirror device and a rotatable housing with a fixed mirror and a rotatable mirror. The deformable micromirror device directs selected light beams generated by the luminaire to the fixed and rotatable mirrors for projection to a stage display. Color may be achieved by use of color wheels, chromatic prisms, and/or lasers.
    Type: Grant
    Filed: December 10, 1999
    Date of Patent: July 2, 2002
    Assignee: Altman Stage Lighting Company
    Inventors: Roger A. Pujol, Thomas P. Tyler
  • Patent number: 6038361
    Abstract: A light guide support mechanism to minimize light transmission loss to the extent possible that houses a light guide in hollow cones such that each of the two end surfaces of the light guide protrudes from the windows of cover members fixed to either external end of the pair of hollow cones that are linked along their axis and that suspend the light guide in the empty spaces in the cones in a suspended state by means of relative rotation of the hollow cones such that the ridges of the light guide are in contact with the edges of the windows in the covers in a point-to-surface or edge-to-surface fashion.
    Type: Grant
    Filed: December 24, 1997
    Date of Patent: March 14, 2000
    Assignee: Minolta Co., Ltd.
    Inventors: Tsutomu Yoshikawa, Hideki Nagata
  • Patent number: 5386257
    Abstract: Apparatus for aligning the optical systems of a lamphouse and a movie projector in the form of a laser alignment tool having a single beam laser with a diffraction grating to split the beam into multiple beams and the laser diode module is housed in a cylindrical casing. The diffraction grating splits the single laser into a specific number of beams of equal intensity, consisting of a center beam and each of the beams to either side of it at equal angles. The laser alignment tool has a geared motor with an adjustable speed which rotates the diffraction grating so that each angled beam sweeps a concentric circle with respect to the other beams. The diffraction grating is interchangeable so that the laser alignment tool can be used for lamphouse systems with varying focal lengths or for other applications such as reflector inspection. The motor may be turned on or off while the laser is kept on. The speed of rotation of the beams is controlled by varying the voltage to the motor.
    Type: Grant
    Filed: September 27, 1993
    Date of Patent: January 31, 1995
    Inventor: Troy Swartwood
  • Patent number: 5208891
    Abstract: A viewgraph projector having a light above the transparency receiver and jecting downward through the transparency is provided. The projected image is received below the transparency by a condenser lens and further transmitted by a flexible fiber-optic cable. A projecting lens is provided at the output end of the fiber-optic cable for projecting the images to a screen. Structurally associated with the projecting lens is a device or means which enables removably affixing the projecting lens relative to a suitable support in a conference room environment, which device may for example constitute a clip, hooking means, clamp, or weights. This enables a subset of the aforesaid elements comprising the light source, transparency receiver, and condenser lens to be located independently of the projecting lens, as for example, to locations where they do not obstruct the audience's field of view or where backscattered illumination from the light source does not annoy the audience.
    Type: Grant
    Filed: October 7, 1991
    Date of Patent: May 4, 1993
    Assignee: The United State of America as represented by the Secretary of the Navy
    Inventor: William J. Prysner
  • Patent number: 5151725
    Abstract: A film editing table includes a light source mounted away from the editor's sitting position, with a light guide transmitting the light to the film editing table's optics to produce images on the table's rear projection screen with a brightness and color temperature substantially the same as the images displayed in commercial theatres such that accurate color judgments can be made for animation film. The editing table can also be used to edit dailies of live action motion picture films. The light source is preferably a Xenon light source and the light guide is preferably a liquid light guide. The end of the guide from which the light emanates is movable along three axes, producing the brightest image possible.
    Type: Grant
    Filed: January 8, 1991
    Date of Patent: September 29, 1992
    Assignee: The Walt Disney Company
    Inventors: Gordon E. Liljegren, David S. Inglish
  • Patent number: 5054909
    Abstract: A lamp housing for a motion picture projector which provides for moving the projection lamp forward and backward, up and down, and side to side, for changing the position of the lamp with respect to the focusing reflector and the film aperture. A control for automatically setting the lamp at two preselected focusing locations. Manual adjustment for moving the lamp in all three directions and remote electrical control means for moving the lamp in all three directions.
    Type: Grant
    Filed: November 26, 1990
    Date of Patent: October 8, 1991
    Assignee: Christie Electric Corp.
    Inventor: Steinar A. Larsen
  • Patent number: 5015088
    Abstract: In an illuminating apparatus for projection purposes, in particular a film projector or television image projector by the eidophor system, four condensers are located around a source of light in a cube-shaped housing, the condensers reproducing via the use of deflecting mirrors, an image of the light source on several, spatially adjacent imaging mirror segments, which in turn reproduce the condenser images superimposed upon one another, via an output mirror, on an image aperture of the projection optics.
    Type: Grant
    Filed: August 30, 1990
    Date of Patent: May 14, 1991
    Assignee: Gretag Aktiengesellschaft
    Inventors: Bruno Rhomberg, Beat Frick
  • Patent number: 4916485
    Abstract: A film projector has side-by-side lamphouses each containing a xenon light source, light beam reflectors and a condensor lens for reshaping the reflected circular light beams into horizontal ellipsoidal light beams flattened by masking for the projection of stereo images by a pair of projection lenses having their optical axes coincident with diagonally related images of a stereoscopic image pair. Non-stereo images may likewise be selectively projected.
    Type: Grant
    Filed: July 18, 1989
    Date of Patent: April 10, 1990
    Assignee: Parallex Company, Inc.
    Inventors: Stanislaw Loth, Anthony Petitto
  • Patent number: 4645318
    Abstract: An apparatus is described for projecting a motion picture image on a screen that extends 360.degree. around the viewers, by moving a film past a slit through which light shines, forming an image of the slit on the screen, and rapidly revolving the slit image around the screen. The film moves rapidly enough to permit the projected slit image to rotate around the screen at a rate of at least about 50 rotations per second. The film, which moves continuously, can be free of sprocket holes and can be driven by a capstan drive, and the film can have a thickness less than half the thickness of present film stock so that a roll of film of moderate diameter can last several minutes.
    Type: Grant
    Filed: August 2, 1985
    Date of Patent: February 24, 1987
    Assignee: Showscan Film Corporation
    Inventor: Douglas Trumbull
  • Patent number: 4596451
    Abstract: In a 3D motion picture projection system using polarized light, a light source and a reflector for imaging a convergent beam of light onto a film gate, a film with right and left stereo images at the gate, and means for projecting, polarizing and overlapping said stereo images onto a metallized screen; the improvement comprising an optical device for pre-polarizing the convergent light beam, a double refracting crystal located to transmit the convergent light beam, whereby two adjacent orthogonally polarized images, respectively vertical and horizontal, are placed onto the said right and left stereo images at the film gate with substantially no light loss; and polarized viewers having orthogonally polarized filters with their polarizing axes respectively vertical and horizontal, worn by the observer to separate the 3D images, whereby the light efficiency of the system is doubled.
    Type: Grant
    Filed: June 23, 1983
    Date of Patent: June 24, 1986
    Inventor: Alvin M. Marks
  • Patent number: 4560260
    Abstract: A method is described for producing and projecting a theater quality entertainment motion picture, by photographing and then projecting the motion picture on a screen, which creates an unusually vivid impression of realism. The film frames have a resolution of over 40 line pairs per milimeter, and each frame has an area of at least 0.36 square inch, which creates more than 10 million pixels per frame on the film and on the screen. The illumination level on the screen is at least 15 foot lamberts. The film frames are photographed and projected at a predetermined constant rate of more than 50 frames per second, such as 60 fps. The high resolution and light level, combined with the unusually high frame rate, has been found to produce an unusually vivid impression of realism.
    Type: Grant
    Filed: October 10, 1984
    Date of Patent: December 24, 1985
    Assignee: Showscan Film Corporation
    Inventor: Douglas Trumbull
  • Patent number: 4477160
    Abstract: A method is described for producing and projecting a theater quality entertainment motion picture, by photographing and then projecting the motion picture on a screen, which creates an unusually vivid impression of realism. The film frames have a resolution of over 40 line pairs per milimeter, and each frame has an area of at least 0.36 square inch, which creates more then 10 million pixels per frame on the film and on the screen. The illumination level on the screen is at least 15 foot lamberts. The film frames are photographed and projected at a predetermined constant rate of more than 50 frames per second, such as 60 fps. The high resolution and light level, combined with the unusually high frame rate, has been found to produce an unusually vivid impression of realism.
    Type: Grant
    Filed: August 26, 1982
    Date of Patent: October 16, 1984
    Assignee: Showscan Film Corporation
    Inventor: Douglas Trumbull
  • Patent number: 4414608
    Abstract: An endoscope with an adapter used in combination with a light source unit including a socket having an electrical contact and a light source for illumination. The adapter includes a main body portion having a first connecting portion capable of being removably fitted with a connector of an endoscope and a second connecting portion capable of being removably attached to the socket, first electrical contacts disposed at the first connecting portion to be electrically connected with electrical contacts of the connector, second electrical contacts disposed at the second connecting portion connected to the first electrical contacts so as to be electrically connected with the electrical contact of the socket and a bore optically connecting a light guide in a projected pipe of the endoscope with the illuminating light source of the light source unit.
    Type: Grant
    Filed: July 30, 1981
    Date of Patent: November 8, 1983
    Assignee: Olympus Optical Co., Ltd.
    Inventor: Hiroyuki Furihata
  • Patent number: 4405218
    Abstract: A shutterless optical system for viewing motion pictures, especially suitable for an 8 mm viewer, is disclosed in which the film moves continuously in a circular path around the optical center of a lens. The motion of the film is compensated by a rotating mirror wheel--a disk or wheel of outward-facing flat mirrored surfaces. The error in one dimension ordinarily resulting from the curvature of the film path is avoided by use of a line light source and a lens between the source and the film.
    Type: Grant
    Filed: July 30, 1981
    Date of Patent: September 20, 1983
    Inventor: John L. Wirth
  • Patent number: 4372656
    Abstract: This invention provides a high efficiency polarized light source and system for the projection of 3D motion pictures adaptable to a standard motion picture projector device. The projected light beam is compressed into a shape more nearly approximating the aperture shape so that substantially less than 40% of the light is lost at the gate.
    Type: Grant
    Filed: May 15, 1981
    Date of Patent: February 8, 1983
    Inventors: Alvin M. Marks, Mortimer Marks
  • Patent number: 4350417
    Abstract: An apparatus for controlling the light intensity output from an arc lamp for use with an arc lamp-illuminated projector includes a light valve to control the projector output light intensity by the selective positioning of the light valve in all or a portion of the light path between the arc lamp and the projector output. The light valve is operatively coupled to the output of a magnetically coupled clutch, the input of the clutch being continuously driven by a motor. A programmer applies a voltage proportional to the desired light intensity to the clutch for controlling the degree of magnetic coupling, and therefore the position of the light valve. The variable torque applied through the clutch to the light valve may be countered by a variable counter-torque produced as by a spring to establish the desired continuous range of equilibrium positions of the light valve.
    Type: Grant
    Filed: March 6, 1981
    Date of Patent: September 21, 1982
    Assignee: Strong Electric Corporation
    Inventor: Robert S. Freeman
  • Patent number: 4202611
    Abstract: One or more remote control arrangements are provided for interconnection to projector apparatus including local controls. Each of the remote control arrangements includes momentary actuated push-button controls for independently controlling the forward, reverse and stop drive modes and the on and off lamp status of the projection apparatus. Each of the remote control arrangements and the local control arrangement generate or synthesize a predetermined control signal corresponding to each of the drive modes and lamp status conditions from a signal waveform inputted to the remote control arrangements from the projection apparatus over one conductor of the interconnection cable between the projection apparatus and each of the remote control arrangements.
    Type: Grant
    Filed: January 8, 1979
    Date of Patent: May 13, 1980
    Assignee: Bell & Howell Company
    Inventor: Robert R. Parker
  • Patent number: 4185899
    Abstract: A combination viewer and projector having a housing with a rear-lighted viewing screen mounted therein. The housing is adapted to receive a magazine having a length of film therein which can be advanced past an aperture in the magazine. A source of light is provided in the housing and is then directed into the magazine to form an image from the film in the aperture. Means is provided in the housing for receiving the image and for directing it onto a rear-lighted screen or alternatively through a projection opening in the housing.
    Type: Grant
    Filed: June 1, 1976
    Date of Patent: January 29, 1980
    Assignee: Action Films, Inc.
    Inventors: Hugh P. Sherlock, Edwin E. Ewry, Werner E. Sandvoss, Werner W. Ciupke, Glenn E. Brown, William T. Link
  • Patent number: 4093366
    Abstract: A motion picture projector is provided with a high intensity projection arrangement for improved image projection that also provides a projection lamp having a longer operating life. The projector is interconnected to a power supply unit by a multiconductor umbilical cable to supply all voltage and power requirements of the projector.The power supply unit is enabled to supply a high voltage starting pulse to the high intensity projection lamp only upon the occurrence of predetermined conditions to prevent shock hazards. The enabling control of the power supply is accomplished by the use of a standard projector control switch and a housing interlock switch on the projection lamp arrangement. Further, the power supply unit is enabled only when the umbilical cable is properly connected between the projector and the power supply unit by means of a return path continuity detector.
    Type: Grant
    Filed: March 14, 1977
    Date of Patent: June 6, 1978
    Assignee: Bell & Howell Company
    Inventor: Kenyon A. Hapke
  • Patent number: 4077705
    Abstract: A motion picture projection apparatus capable of selective use of two types of films with an open reel assembly and a film cartridge having mounted therein a pressure plate associated with a reflecting mirror. The apparatus is provided with a displaceable member carrying a pressure plate associated with a light reflecting element for use with a film strip fed from the open reel assembly. The displaceable member is arranged in the projection station of the apparatus to be displaced to a projection position where the film of open reel type is in alignment with the optical axis of the projection system and to an idle position where the film of open reel type is out of alignment with the projection system in automatic response to a removal and an insertion, respectively, of the film cartridge from and into the projection position. This is a continuation of application Ser. No. 472,416 filed May 22, 1974, now abandoned.
    Type: Grant
    Filed: October 22, 1975
    Date of Patent: March 7, 1978
    Assignee: Canon Kabushiki Kaisha
    Inventor: Kuniyoshi Suzaki
  • Patent number: 4061911
    Abstract: A lamp system for a light projector for continuous light projection upon burn-out of a main lamp. A main lamp with a highly directional light pattern is mounted to the frame for light pattern alignment with the optical axis of the projection lens. A spare lamp is mounted at a location remote from the optical axis. Electronic circuitry detects failure of the main lamp and energizes the spare lamp. A mirror pivots about a point remote from the optical axis for positioning the mirror between the first position which does not effect nor obstruct light transmission between the main lamp and the projection lens and between a second position where the mirror reflects light from the automatically energized spare lamp along the optical axis of the projection lens upon failure of the main lamp.
    Type: Grant
    Filed: April 14, 1976
    Date of Patent: December 6, 1977
    Assignee: Audio Visual Innovators Corporation
    Inventor: Thomas L. Krasin
  • Patent number: 4023893
    Abstract: A retrofit assembly for replacing a lens-containing lamp in an overhead projector. The assembly comprises a quartz-halogen lamp, having an internal reflector and an enlarged base removably mounted in the projector, and a lens holding bracket removably mounted in the projector in alignment with the lamp. The bracket is resiliently pivoted toward the lamp and has a tab for striking the lamp base to retain the lens at a predetermined distance from the lamp.
    Type: Grant
    Filed: June 28, 1976
    Date of Patent: May 17, 1977
    Assignee: GTE Sylvania Incorporated
    Inventors: Roger T. Hebert, John A. Pappas, Richard J. Shea
  • Patent number: 3998532
    Abstract: The invention utilizes a vertically positioned arc lamp and associated lamp ollector-reflector in conjunction with depending associated secondary and projection mirrors, the projection mirror being convex and centrally apertured to form an exit pupil closely adjacent and above the head of an observer and in the center of a curved projection screen to minimize perspective distortion of image as seen by the viewer. The invention further provides an elimination of shadow effect by the depending relationship of the apparatus and by the recessing of arc lamp electrode through an aperture in the lamp reflector. An adaption of image spacing by recessed fitting of image on film to adapt the film to intended projector image width is also an aspect of the invention.
    Type: Grant
    Filed: April 8, 1974
    Date of Patent: December 21, 1976
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventor: Wiley V. Dykes
  • Patent number: 3995153
    Abstract: Optical projectors of the kind which supply a beam of radiation whose total ngular field 2.rho.' is determined in at least one reference plane, the angular field containing all the radiant flux, the projector also incorporating a source of radiation associated with a reflecting optical collector system, a conoid or pyramidoid mirror which has at least the reference plane as a plane of symmetry and the minor base of which in conjunction with the reflecting optical collector system, entirely contains optically the source of radiation. The mirror is made to conform to the following dimensional relationships which apply to each cross-section of the mirror through a plane of symmetry: ##EQU1## WHERE D and d are respectively the cross-sectional lengths of the major and minor bases of the mirror in the cross-sectional plane in question, .gamma. is half the mean apex angle of the mirror in the cross-sectional plane in question, and .theta.
    Type: Grant
    Filed: March 25, 1974
    Date of Patent: November 30, 1976
    Assignee: Ste de Recherche et de Promotion d'Activities Nouvelles ACNO
    Inventor: Pierre Malifaud
  • Patent number: 3937567
    Abstract: A continuous motion picture projection apparatus for use with a film strip having two side by side data tracks each comprising a photographic image track and a synchronized sound track. The first half of the program is carried by one data track and the other half by the second data track. The apparatus includes a main drive assembly which moves the film strip through the unit alternately in a forward and reverse direction and further comprises an illumination system, a projection lens system and a sound track sensor system. These systems are movable between a first position in alignment with the first data track and a second position in alignment with the second data track. Mechanisms associated with each of the systems are operably coupled with the main drive assembly and serve to automatically move the systems between their first and second positions upon reversal of the drive assembly.
    Type: Grant
    Filed: March 29, 1974
    Date of Patent: February 10, 1976
    Assignees: Betty Thomas, Helen Hansen
    Inventors: Richard Thomas, deceased, by Betty M. Thomas, executrix