Abstract: A compact wide angle rear view mirror mountable on a handlebars of a small vehicles includes a convex reflecting surface held in a frame having straps for fastening the frame to the handlebars.

Abstract: The invention is a window for transmitting infrared radiation for use with infrared systems, such as an infrared laser. In detail, the window comprises a polycrystalline silicon substrate doped with between 1.times.10.sup.14 and 1.times.10.sup.16 atoms per cubic centimeter of an n-type impurity. The impurities can be selected from the group consisting of Phosphorus, Arsenic, Antimony, Bismouth and Lithium. To reduce reflection, both sides of the sheet are coated with an antireflection coating. Sheet resistances of less than 25 ohms per square are obtainable while simultaneously providing excellent transmission in the infrared at both room and elevated temperatures. The internal heating produced by coupling the window to a source of electrical power can be used for deicing.

Abstract: A gradient index filter can be fabricated with integral antireflection properties without degrading the inband performance of the filter. The filter is for placement between an incident medium and a substrate to reflect incident electromagnetic energy having wavelengths within a predetermined band of wavelengths and to transmit incident electromagnetic energy having wavelengths outside of the reflection band. The filter includes an antireflecting portion having a nominal refractive index profile selected to reflect a minimum amount of electromagnetic energy from a theoretical interface between a first medium having a first predetermined refractive index and a second medium having a second predetermined refractive index. A band rejecting portion has a periodic refractive index profile whose periodicity and amplitude are selected to reflect a maximum amount of electromagnetic energy within the relfection band.

Abstract: A diffusion plate useful for capturing a real image in an optical system. The plate has a roughened semi-transparent surface for diffusing incident radiation. The surface is comprised of cones etched therein for form a roughness. The cones have a geometry and average center-to-center distances which are precisely predetermined to correspond with either a desired angle of divergence or with a desired diffusion intensity.

Abstract: A rotational polygon mirror and a method of manufacture thereof comprising a base member having a polygonal pole-like portion, the base member being formed of a relatively light-weight material which can be easily molded into a complicated shape, and a coating film which is provided on one or more side surfaces of the polygonal pole-like portion and on which a reflecting mirror surface is formed, the coating film being of at least one layer structure.

Abstract: A method of driving a liquid crystal display device by a voltage averaging method comprises the step of operating this device at a bias ratio which is larger than the theoretically optimum bias ratio for the device so that unevenness in contrast is reduced.

Abstract: A stereomicroscopic inspection system having low eyestrain features is disclosed. The system (10) includes an objective lens assembly (12) for forming an image of a viewed object (22). A prism mechanism (14) is positioned adjacent to the objective lens assembly (12) for orienting the image along a heads-up axis. A telephoto objective assembly (16) is positioned adjacent to the prism mechanism (16) for focusing the image transmitted through the prism mechanism (14). A reticle (18) is positioned adjacent to the telephoto objective assembly, and the image is focused (16) onto the reticle (18). An assembly (20) is positioned adjacent to the reticle (18) for enabling heads-up viewing of the object by the viewer, (22) said system projecting a virtual image at a predetermined distance from the viewer. This distance may be substantially equal to the eye's natural focusing distance to minimize eyestrain.

Abstract: A zoom lens system for use in microfilm projection apparatus in which the image projection is conducted in a condition of a definite object-image distance, the system comprising from the enlargement side to the reduction side, an aperture stop disposed fixedly, a first lens group of a positive refractive power located near the aperture stop at the longest focal length side, a second lens group of a negative refractive power, and a third lens group of a positive refractive power, wherein the first to third lens groups are moved along the optical axis while increasing a distance between the first and second lens groups and decreasing a distance between the second and third lens groups in an operation of zooming from the longest focal length side to the shortest focal length side.

Abstract: A projection objective with variable focal length is provided, consisting of a front member (F) with negative refractive power and a multiple-lens basic objective (G) with positive refractive power, between which a multiple-lens variator (V) displaceable in the direction of the optical axis and with positive refractive power is disposed, with said objective having seven self-contained lenses (L1-L7) separated from each other by air spaces and free of cemented surfaces, whereof the front member (F) consists of one single lens (1) with negative refractive power, the basic objective consists of a Cookes or Taylor lens (L5, L6, L7) and the variator (V) likewise consists of a Cookes or Taylor lens (L2, L3, L4).

Abstract: A light assembly for generating a narrow light beam of relatively uniform intensity for use in association with a light sensor for sensing variations in light intensity; the assembly includes a plurality of standard size aperture light bulbs positioned in a staggered arrangement in a housing with light extender members comprising alternating sheets of light transmissive material joined to form a common surface to generate the light beam.

Abstract: A lens barrel having a fixed outer tube, a distance scale window formed in the outer peripheral surface of the fixed outer tube, a focusing ring which is disposed inside of the fixed outer tube and which is capable of moving in the direction of the optical axis and rotatable about the same, a focusing mechanism for moving the focusing ring in the axial and peripheral directions, a distance scale ring facing the inner periphery of the distance scale window and supported such as to be only rotatable about the optical axis, the distance scale ring having distance scale marks formed on its outer peripheral surface, and an interconnecting mechanism for interconnecting the focusing ring with the distance scale ring. The interconnecting mechanism turns the distance scale ring in response to the turning movement of the focusing ring about the optical axis. Simultaneously, the focusing ring moves in the direction of the optical axis without axially moving the distance scale ring.

Abstract: Fixturing for repair of automobile radiators is disclosed, usable for recoring of either brass or plastic tank radiators, including clamping gates providing first and second sets of parallel side rails adjustably spaced to receive a radiator header with a pneumatic cylinder exerting clamping pressure on the tank top. The radiator sits atop the first set of side rails when resoldering conventional tanks and is recessed between the second set of side rails which are alternatively installed for decrimping and crimping of the header tabs of plastic tank radiators. Crimping and decrimping hand tools of special configuration are disclosed which cooperate with the second set of side rails to permit single handed operation.

Abstract: An illumination optical system for an endoscope comprising an illumination lens, which is provided on the object side of the light exiting end of a light projecting element and comprises at least one aspherical lens element, the illumination optical system for an endoscope being arranged to be applicable to a wide angle endoscope and, at the same time, being arranged to have a favorable light distribution characteristic, which ensures bright illumination up to the marginal portion of the field, and arranged that the loss in the intensity of light is small.

Abstract: A comapct zoom lens system for video camera is provided which comprises from the object side to the image side; a first lens group of a positive refractive power fixed on the optical axis of the lens system; a second group of a negative refractive power shiftable along the optical axis in the zooming operation; a third lens group of a negative refractive power shiftable in the zooming operation and in the focusing operation; a fourth lens group of a positive refractive power fixed on the optical axis and consisting of at most two positive lens components; an aperture diaphragm; and a fifth lens group including, a front lens unit consisting of a positive lens component having a stronger refractive surface on the object side and a negative lens component having a stronger refractive surface on the object side, and a rear lens unit of a positive refractive power consisting of a positive lens component, a negative meniscus lens component having an objective side surface convex to the object side and a positive le

Abstract: Apparatus for indicating the presence of a liquid on a member includes a substrate having a pattern thereon that is perceptibly visually modified by the presence of a liquid on the member.

Abstract: A rear viewing apparatus is provided having a convex mirror having a frame backing attached by rotatable hinges to a second frame having straps thereon for mounting onto a conventional truck mirror. The frame backing of the convex mirror is attached by rotatable hinges to the mounting frame having a larger and a smaller hinge providing for an approximate 15 degree angle between the convex mirror and the mounting frame. Thereby, a rear-view viewing angle of approximately 86 degrees is provided.

Abstract: An improved lens system for a projection television is described. The lens system is designed to be used with a cathode ray tube having a face glass with an aspheric surface having phosphor elements mounted thereto. The aspheric surface of the face glass has its maximum radius at the optical axis and is of lesser radius outwardly thereof. From the screen, the lens system companies a first aspheric lens of relatively weak power, a second biconvex lens of relatively high positive power, a third aspheric lens of weak positive power and a fourth lens having a concave face on its screen sider and of relatively large negative power.

Abstract: An optical processor includes a non-linear spatial light modulator defining an array of logic gates and having an output plane 10 ) and an input plane 12. The array is made up of a plurality of cells 14 each containing a plurality of logic gates 16. A lenslet array 18 comprising an array of lenslets 20 associated one with each cell 14 respectively focusses the oututs of the cells onto respective facets 22 of a holographic array 24. Each facet of the holographic array defines a predetermined mapping or routing configuration to map the respective cell onto the input plane 12. The cells may be mapped either precisely onto the predetermined cell of the input plane or in cell-shifted fashion. An optical processor is described which employs the arrangement illustrated in FIG. 1 to enable asembly of a plurality of similar interacting modules for implementing a regular algorithm such as a fast multiplier array.

Abstract: a Fresnel lens for use in rear projection screens wherein said lens has a plurality of facets facing away from the light source and each of said facets has an optimal riser angle, said riser angle varying from the center to the outer edge of said lens as a function of the focal length the refractive index, the angular subtense of the exit pupil and the radial distance from the center of the lens, thereby improving the efficiency of the Fresnel lens.

Abstract: An optical head apparatus for an optical disc player which stabilizes the servo action, enables high speed access, extends the drawing range of tracking servo action, and further enhances the servo stability. This is done by making the driving mechanism and movable parts for access common to those for tracking to reduce the weight, and moving the stand carrying the condenser lens and mirror in focusing, tracking and accessing in the direction of the optical axis to eliminate deviation of the optical path, and also fixing the tracking and access coils to the condenser lens.