Abstract: A compact dot sight is provided, in which the inner cylinder is eliminated and no structure protrudes from the left and right side walls of a lens barrel. The dot sight includes: a lens barrel; objective lenses fixed to a front opening of the lens barrel; an eyepiece lens fixed to a rear opening of the lens barrel; a light source for projecting a point image from an inside of the lens barrel to the objective lens; a power supply circuit for supplying power to the light source; and a dot adjustment mechanism that has a holder of the light source and can adjust the position of the point image projected on the objective lens by moving the holder vertically and horizontally.

Abstract: A head-mounted device mounted on a wearer's head has a first pressing unit to press against the wearer's head from a position of his/her medulla, a second pressing unit to press against the wearer's head in an opposite direction to a pressing direction of the first pressing unit, and a mounting unit to mount the head-mounted device on the wearer's head by adjusting at least one of the first pressing unit and the second pressing unit.

Abstract: A projection optical system including a projection lens, a first mirror that reflects a light from the projection lens, and a second mirror that widens an angle of a light from the first mirror by reflecting the light projects a light modulated according to an image signal from an optical engine unit. A third mirror reflects a light from the projection optical system. A screen transmits a light from the third mirror. An optical axis of the projection lens substantially matches an optical axis of the second mirror, and the light from the optical engine unit is shifted to a specific side from the optical axis of the projection lens.

Abstract: A projection apparatus (10) has an LC modulator panel (60) with photoresponsive layer (316), segmented into a first, second, and third portion, each spatially separated. An image writing section (120) forms a first, second, or third image within the corresponding portion of the LC modulator panel by scanning successive lines of image writing light to energize the photoresponsive layer. The image writing section has at least one grating electromechanical system for modulating a narrow-band light source (70) by providing diffracted and non-diffracted orders and a scanning element (98) for directing a line of light toward the LC modulator panel to energize the photoresponsive layer. An illumination section (130) directs the illumination beams for modulation by the LC modulator panel. Polarizing beamsplitter (24r, 24g, 24b), polarize and direct the illumination beams toward the LC modulator panel and directs modulated light toward projection lens (32).

Abstract: An optical channel monitor is provided that sequentially or selectively filters an optical channel(s) 11 of light from a (WDM) optical input signal 12 and senses predetermined parameters of the each filtered optical signal (e.g., channel power, channel presence, signal-noise-ratio). The OCM 10 is a free-space optical device that includes a collimator assembly 15, a diffraction grating 20 and a mirror 22. A launch pigtail emits into free space the input signal through the collimator assembly 15 and onto the diffraction grating 20, which separates spatially each of the optical channels 11 of the collimated light, and reflects the separated channels of light onto the mirror 22. A ?/4 plate 26 is disposed between the mirror 22 and the diffraction grating 20. The mirror reflects the separated light back through the ?/4 plate 26 to the diffraction grating 20, which reflects the channels of light back through the collimating lens 18.

Abstract: An image transferring device is disclosed having a support plate, a reflective plate and a core member adapted to support the support plate and reflective plate thereon. The core member includes an operative position stop member and a storage position stop member for each of the support plate and reflective plate. The support and reflective plates are angularly rotatably about the core member and each plate's angular rotation is restricted between the operative position stop member and the storage position stop member. In an operating configuration, the support plate is automatically positioned at a specified angle with respect to the reflective plate. In a storage configuration, the plates fold toward each other for easy storage.

Abstract: A scanning type display optical system which is small in size and can display images by two-dimensionally scanning light is disclosed. The scanning type display optical system scans light from a light source in a first direction by a first scanning device, and scans light from the first scanning device in a second direction by a second scanning device. Between the first scanning device and the second scanning device, a light guide optical system which includes at least one rotationally asymmetric reflective surface to guide light from the first scanning device to the second scanning device is provided.

Abstract: An apparatus for lettering or marking articles by means of a laser beam, comprising a laser to produce a laser beam and a focussing optical system to produce a larger radiation density on the surface of the article wherein a lens system is provided the focussing plane of which constitutes an area which is curved away from the lens system.

Abstract: An optical, image producing device of the Camera Lucidas type is provided wherein the panel on which the optical image is superimposed may be supported at different angles of inclination on a base, to which a mirror assembly carrying column is rigidly attached, so that the inclination of the panel can be adjusted allowing the device to be used tilted to observe an object at different elevations. The column has a viewing aperture which is wide enough for an image to be viewed simultaneously by both eyes to give a panoramic view.

Abstract: An ANVIS aid, such as an ANVIS goggles set, with a first optical filter is described. A second optical filter blocking light in an opposite sense from the first optical filter is placed at a color display, which may otherwise present offending light that would interfere with the ANVIS.

Abstract: There is provided an illumination system for lithography with wavelengths of ≦193 mn. The system comprises a first optical element, which is divided into first raster elements and lies in a first plane. The first plane defines an x-direction and a y-direction, the first raster elements each have an x-direction and a y-direction with an aspect ratio, and at least two of the first raster elements have aspect ratios of different magnitude.

Abstract: An apparatus for lettering or marking articles by means of a laser beam, comprising a laser to produce a laser beam and a focussing optical system to produce a larger radiation density on the surface of the article wherein a lens system is provided the focussing plane of which constitutes an area which is curved away from the lens system.

Abstract: Disclosed is a measuring system for measuring performance of an imaging optical system by use of an interferometer, which includes an interferometer arranged to measure transmission wavefronts separately or sequentially, in relation to at least one of plural measurement points defined along a plane perpendicular to an optical axis of the imaging optical system, wherein position coordinates of object side and image side imaging points of the plural measurement points are measured, and a computing unit being communicated with the interferometer, the computing unit being operable to calculate a wavefront as measured by the interferometer and at least one of a wavefront aberration and an imaging state of the imaging optical system, and the computing unit being operable to correct a measured value related to at least one of a wavefront aberration and an imaging state of the imaging optical system at another measurement point, while taking, as a reference, at least one of a wavefront aberration and an imaging state

Abstract: The invention relates to a three-dimensional optical memory medium capable of recording and reading a large quantity of information therein and therefrom and a process for producing the same. A recording pulsed laser beam is applied to an arbitrary position in a luminescent-ion-containing solid medium as the solid medium is three-dimensionally moved relative to a converging point of the pulsed laser beam.

Abstract: An optical virtual touch pad system wherein reflective optics are used to superimpose a virtual image of a television screen display onto a touch-sensitive digitizing surface being operatively contacted by a user-controlled contact member. Alternatively, the system uses reflective optics to superimpose an uninverted virtual image of the digitizing surface and the contact member operating thereon onto the surface of the display. The system thereby, for example, can be used as a user interface to control interactive content on a home television.

Abstract: A collimating apparatus that reduces ghost images in the field of view of a main image generated. The collimating apparatus includes a meniscus lens having a reflective concave surface; a cholesteric liquid crystal (CLC), aligned on an axis common with the meniscus lens, disposed on the concave side of the meniscus lens, positioned to reflect light onto the concave surface and having a tilt making the normal of the CLC different from the normal of the meniscus lens; and an image source, disposed on the convex side of the meniscus lens and having a tilt corresponding to the tilt of the CLC. The tilted pair of the meniscus and image source direct any ghost images produced by light leaking through the CLC away from the line of sight of an observer of the main image.

Abstract: There is disclosed a compact lens system having four injection-molded singlet lens elements with one of the singlet lens elements having a diffractive optical surface to control axial chromatic aberrations and another of the singlet lens elements having a flint-like plastic material to control lateral chromatic aberration. The lens system includes interdigitated flange features which provides interdigitated alignment between the lens elements. A plurality of light suppression elements are used to suppress stray light paths from reaching a detector array of the lens system. Moreover, the lens system includes an anti-aliasing surface on one of the lens elements for controlling aliasing effects.

Abstract: An optical apparatus includes a display for displaying image information, a display optical system having a plurality of reflection surfaces for guiding a light beam from the display to an eyeball of an observer, an image sensor, an image pickup optical system having a plurality of reflection surfaces for focusing a light beam from an external field to form an image on the image sensor, and an optical path separating surface for separating an optical path in the display optical system and an optical path in the image pickup optical system from each other in opposite directions. Thus, image information provided on the display can be viewed by the observer, and a scene in the external field can be taken in the image sensor.

Abstract: A low-cost high-speed device for correcting the marking position of a laser marker, which uses a smaller quantity of corrective data and a simplified arithmetic operations, wherein corrective values for design parameters for a lens are obtained on the basis of a production tolerance of the lens. The design parameters of the lens are corrected according to the corrective values, and the distance for the lens to move is calculated from the corrected design parameters of the lens and the distance to a desired marking position. A move command corresponding to the calculated distance is outputted to lens drive means, and a pattern of a divided image is marked in the desired position.

Abstract: A metallic oxide or halogen coated displaying cubicle is formed from two triangular-shaped portions forming a square cube such that a first imprinted, etched or otherwise permanently secured on the like image, such as a company logo, is positioned on one of the six faces is projected through another of the faces so that one may view one or both of the images separately or in combination with one another.

Abstract: An improved computer graphic work station is disclosed of the type that includes a digitizer for allowing an artist or other user to input a drawing into a computer, and an imaging device to produce an image of the drawing as it is being drawn. A beam splitter reflects at least a portion of the produced image to the eye of the user. The position and orientation of the beam splitter may be varied by a user relative to the imaging device in order to allow the user to align the workstation by causing the reflected image to appear, in the user's eye, to be substantially coincident with the drawing. Once aligned, the user may adjust the position and orientation of the digitizing surface without upsetting the alignment.

Abstract: A method and an apparatus for locating in the sky celestial objects, using a telescope, wherein two guide stars and the celestial object are represented, according to their respective locations, on a disc which is able to rotate with respect to the telescope around an axis, orthogonal to the telescope axis, and passing through the representation of the celestial objects. The images of the two guide stars are projected in the sky and the telescope and the disc are moved until the images of the guide stars are superposed with the respective actual guide stars in the sky.The guide stars form a triangle with the celestial object. The telescope is preferably provided with a alt-azimuth type mounting. The guide stars are represented on the disc by small holes. A light source placed under the disc creates light dots which are projected in the sky using a plano convex lens optically aligned with the disc rotation axis, and a semi-transparent mirror inclined at 45 degrees on the rotation axis.