Abstract: In an ocular lens system for use with a penta-mirror, an ocular lens includes a positive meniscus lens whose concave surface is directed to the pupil side and whose convex surface is directed to the object. The concave and convex surfaces of the positive meniscus lens are aspherical. The two surface are shifted to the pupil side from reference spherical surfaces defined by paraxial radii of curvature.

Abstract: A reading lens for a scanner to read an original in a reduced magnification, the lens comprising six lenses, i.e., from a first lens to a sixth lens in order on an optical axis. The first lens is a positive lens having a first lens-surface and a second lens-surface. The second lens is a negative lens disposed in contact with the first lens and has the second lens-surface in common with the first lens and a third lens-surface. The third lens is a meniscus lens and has a fourth lens-surface and a fifth lens-surface. The fourth lens is a meniscus lens and has a sixth lens-surface and a seventh lens-surface. The fifth lens is a negative lens and has a eighth lens-surface and a ninth lens-surface. The sixth lens is a positive lens disposed in contact with the fifth lens and has the ninth lens-surface in common with the fifth lens and a tenth lens-surface. At least one of the ten lens-surfaces is formed as an aspherical surface.

Abstract: In a telescope according to the present invention, defocus amount of an optical system constituting the telescope is calculated; whether or not the defocus amount is within a predetermined in-focus range obtained from a focal point adjusting ability of human eye is discriminated; and when the defocus amount exceeds the in-focus range as a result of the above discrimination, the optical system is driven. The optical system is driven in a shorter time than a time required for removing a defocus by human eye.

Abstract: A fixed-focal-length lens system includes first and second lens groups arranged in order from front to rear. The first lens group consists of a plurality of lenses and has a negative refracting power and the second lens group consists of a plurality of lenses and has a positive refracting power. The fixed-focal-length lens system satisfies the following conditions0.58<.vertline.f.sub.1 /f.vertline.<0.95 (1)0.50<.vertline.f.sub.1 /f.sub.2 .vertline.<1.0 (2)1.6<Bf/f<2.9 (3)1.1<f.sub.2 /f<1.45 (4)wherein f represents the focal length of the fixed-focal-length lens system, f.sub.1 represents the focal length of the first lens group, f.sub.2 represents the focal length of the second lens group and Bf represents the back focus of the lens system.

Abstract: An optical correlator system having a plurality of reflective optical components, both active and passive, positioned (1) between a source of electromagnetic radiation, such as a visible beam of coherent light, and an output detector array, and (2) around an asymmetrical perimeter of a planar support body to develop an asymmetrically folded optical axis or path wholly within the body where the path is traversed by the beam SO THAT information processed by the active optical components along the optical path and imparted to the optical beam enable the optical detection of an unknown object at the detector array which is then subject to an identification process.

Abstract: An optical system is described for combining separate deformable mirror device images into a single image. The resulting image is a single continuous image comprising left and right halves corresponding to the original individual images. The system is particularly useful for presenting spatial light modulator images to the printing drum of a xerographic process for letter quality documents. The combined image width allows a substantially greater printing width than was previously possible.

Abstract: The present invention provides an optical device according to this invention comprising a light transmitting optical member of a high molecular material containing mobile ions, and a pair of electrodes formed on surfaces of the optical member, a required potential difference being provided between the electrodes so as to cause ion conduction in the optical member and to reversibly vary a refractive index of the optical member. According to this invention, a refractive index is reversibly varied due to ion conduction, whereby the modulation of a transmitted beam or a reflected beam by the optical device can be reversibly controlled.

Abstract: A laser light show device and method produces a surface projected or suspended holographic image, and includes multiple image projectors. One image projector provides the object image information representing the primary subject. For surface projections, additional background image projectors provide background image information generated using a wobbler plate-reflected beam diffracted through a spherical lens, a beam unidimensionally diffracted through a rotating cylindrical amorphic dipolyhedral lens, and a beam diffracted through multiple diffraction gratings. A suspended holographic image is produced by parabolically focusing multiple images projected onto a spherical image screen.

Abstract: An optical target system is provided for facilitating a vehicle operator's effecting alignment of the respective hitch assembly components of a towing vehicle and a towed vehicle. The system includes first and second targets that are removably positionable in referencing relationship to respective ones of the hitch assembly components and a viewing mirror that is removably positionable on the towed vehicle to provide the vehicle operator positioned in the towing vehicle with a reflected view of the two targets. Each of the two targets includes a longitudinal guidance element that is disposed in alignment with the longitudinal axis of its respective vehicle and a transverse guidance element that is transversely oriented to the respective longitudinal guidance element and located above the hitch assembly component to provide a visual reference to a vertical axis extending through those components.

Abstract: An eye-moistening device comprising spectacles includes a pair of side covers for covering at least left and right sides of eyes, and an eye-moistening member provided on the inner surface of the side cover. This eye-moistening member is adapted to be impregnated with water or medicine. This impregnated water or medicine can be slowly evaporated thereby wetting or soaking the eyes with water or medicine when the spectacles are put on one's face.

Abstract: A system for producing a three-dimensional image of a surface, such as a surface of a cornea, includes a laser beam that passes through a beamsplitter and an objective lens to produce a spherical wavefront that impinges on the cornea and is reflected by the cornea as a return beam back through the objective lens. The return beam is reflected by the beamsplitter through an imaging lens that focuses the return beam onto an imaging screen, through a dual phase plate, and onto a photosensitive array. The dual phase plate includes two sets of spaced periodic refractive features spaced along orthogonal directions. The phase plate is modulated by incrementing it at a 45 degree angle relative to the first and second directions, thereby simultaneously producing phase shear along the two orthogonal directions.

Abstract: A mirror surface for mounting onto an exterior front fender of a vehicle. The mirror surface is a portion of a convex surface ellipsoid with a plurality of radii of curvature. The mirror provides the driver of the vehicle with a field-of-view that is greater than the reflection angle about the vertical axis. The reflective surface has a generally convex shape throughout. The reflective surface a viewing center point that is in general alignment to the geometric center of the reflective surface. The reflective surface is generally symmetrical about a vertical plane passing through the viewing center point and about a horizontal plane passing through the viewing center point.

Abstract: An illuminating optical apparatus comprises a stable resonator type laser equipped with a wavelength selecting element and a device for vibrating the beam one-dimensionally in a direction crossing the longer direction of the beam cross section at at least one of the entrance side and exit side of a fly's eye lens or optical integrator.

Abstract: We describe a device for aligning optical beams that uses either an elliptically curved or a parabolically curved mirror arranged in the reflected beam path between a rotatable mirror, which is placed at the focus of the curved mirror, and the desired target. With the elliptical mirror, the device provides variable angle, fixed position of incidence of the reflected beam upon a target placed at the second focus of the ellipse. With the parabolic mirror, the device provides variable position, fixed angle of incidence of the reflected beam upon a target. Combinations of these devices may be used to solve a variety of beam steering and/or beam alignment problems. These devices are particularly useful for experiments and applications involving ultrashort optical pulses since the time of flight through either of these devices is a constant independent of the angle of incidence and the position of incidence.

Abstract: A mirror apparatus comprising a frame adapted to be rotatably mounted on the side of a vehcile body, a first case secured to one side of the frame for defining a first space therebetween, a mirror movably mounted on the first case and rotatable about a central pivot point and an adjusting mechanism that is mounted in the first space for adjusting the position of the mirror.

Abstract: The present invention is an image intensifier assembly that includes a Generation III image intensifier tube and an inverter lens arrangement, such that the present invention image intensifier assembly can be substituted for a Generation II image intensifier tube in a given application. The inverter lens arrangement is adjustably positionable relative to the Generation III image intensifier tube so the image relayed can be focused to optimize the resolution of the complete tube assembly.

Abstract: An illumination system and method for providing real-time 3-D viewing and increased resolution, sharpness, depth of field, and perception of depth for a transmitted light microscope including a condenser lens having an optical axis, objective lens having an optical axis, and an eye piece, wherein a light beam path shift device enables two or more separate light beams to be directed onto the condenser along paths that are not coincident with the condenser lens optical axis and that produce beam exit paths from the condenser lens which are at maximum oblique angles relative to the objective lens axis which are within the objective lens aperture.

Abstract: A color filter in accordance with the present invention comprises an activated film layer (2) arranged on a transparent substrate (1), said activated film layer (2) having a color pattern formed thereon by permeating a dye thereinto, and a thin metal film pattern (3) formed on a portion, of said activated film layer (2), which requires the formation of a black mask. Accordingly, the color filter integrated into various display devices such as a liquid crystal display is capable of displaying an image having a high contrast.

Abstract: A polarizer, a Faraday rotator and an analyzer are fixed by fused glass applied on an outer periphery of the polarizer to be contacted with the Faraday rotator and on an outer periphery of the analyzer to be contacted with the Faraday rotator. No adhesive exists between contact planes of the polarizer and the Faraday rotator and those of the Faraday rotator and the analyzer.

Abstract: A virtual image display system for displaying a relatively large virtual image to a user derived from a relatively small image source. A lens group is provided for amplifying an image provided by the image source. A plurality of reflecting elements are provided for magnifying the image provided by the lens group and for displaying the relatively large virtual image. Several embodiments are provided that include on-axis and off-axis reflecting versions, and a holographic virtual image version. Conventional lenses and reflecting optics are used to provide the on- and off-axis versions of the system, while a holographic reflecting element is used to provide a holographic virtual image. A window element may also be employed to minimize ambient reflection viewed by the user and eliminates ambient reflection to reduce the user's eye fatigue. The display system improves a user's viewing comfort by positioning the image at a distance matching the visual requirements of the user's eye.