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| Number | Title | Issue Date |
| 4893913 | Steromicroscope having stabilizer for preventing tipping of eyepiece assemblies A stereo vision optical instrument having eyepieces which are rotatably mounted to the instrument by way of pivot plates includes apparatus coupled between the pivot plates to prevent binding of the eyepieces as they are rotated.... | 01/16/1990 |
| 4893887 | Holographic image transfer process A supported thin metal hologram is formed and mounted on a substrate using an adhesive. In a preferred aspect, the hologram is covered with a transparent resin which preferably is identical to the adhesive.... | 01/16/1990 |
| 4890904 | Zoom lens system capable of wide-angle viewing for high zoom ratio A zoom lens system capable of wide-angle viewing for a high zoom ratio has four lens groupss, all of which change the focal length of the overall system while the position of the image plane is held constant. The second lens group comprises a negative len... | 01/02/1990 |
| 4884857 | Scanner for use in multiple spot laser electrophotographic printer An image scanning apparatus for use on a laser electrophotographic printer provides improved imaging in both the scan and process direction in a printer using a multiple spot printhead.... | 12/05/1989 |
| 4880287 | Complex conjugate hologram display Aberration in an image reflected from a warped surface such as an automobile windshield is corrected by providing an image to the windshield which is predistorted to compensate for the aberration. The predistorted image is created and stored in a hologram... | 11/14/1989 |
| 4874215 | Tunable resonant mechanical system The natural resonant frequency (and phase) of a resonant mechanical system (having an spring structure that includes a material whose elastic properties change with temperature, e.g., by at least 0.05% per °C.) is tuned to a desired value by changing the... | 10/17/1989 |
| 4867533 | Friction lock for optical adjustment A lock ring prevents inadvertent rotation of a rotatable focusing eyepiece for an optical instrument. The ring is disposed on the device and is fixed against rotation. A face is provided on the ring which is adapted to frictionally engage the eyepiece to ... | 09/19/1989 |
| 4867514 | Systems for deviating and (optionally) converging radiation Such system can include, in the first plane, a first optical device for producing converging radiation from incident, substantially parallel radiation passing through the first optical device and, in a second plane, substantially parallel to the first pla... | 09/19/1989 |
| 4863250 | F.θ lens system An f.θ lens system which incorporates the advantages of a telecentric optical system and which is also achromatized so as to permit its use with a multi-mode laser. The lens system includes, in order from the light source side, of a first lens unit compo... | 09/05/1989 |
| 4859049 | Contact lens for oriented optical corrections The contact lens comprises a central optical zone and a peripheral zone for fastening the lens. For centering said lens the peripheral zone comprises two stabilizing bosses which are disposed on the horizontal stabilization axis of the lens. For large pal... | 08/22/1989 |
| 4859031 | Optical collimating apparatus An optical collimating apparatus employs a semi-reflective concave mirror and cholesteric liquid crystal element. In one embodiment, the optical collimating apparatus is used as a heads-up display device. Images in the line of sight of an observer substan... | 08/22/1989 |
| 4859039 | Light-polarizing film Highly durable, light-polarizing film having neutral gray as well as high polarizing coefficient is provided. The film comprises a uniaxially stretched base polymer film of, for example, polyvinyl alcohol or derivatives thereof and at least two dichroism ... | 08/22/1989 |
| 4856884 | Dynamically matched optical filtering in a multiple telescope imaging system A dynamically matched optical filter is formed within a multiple telescope optical imaging system. Entrance and exit pupil geometries, the phases and tilts of multiple imaging paths and system alignments are sensed and controlled to allow wide field of vi... | 08/15/1989 |
| 4856879 | Aiming device An aiming device (diopter) has an easily removable eyepiece with adjustable diaphragm mounted on one end of a housing portion which housing portion has a cavity eccentrically formed therein. A color filter disc and two polarizing filter discs are rotatabl... | 08/15/1989 |
| 4854687 | Beam steering mirror construction A beam steering mirror is mounted in a frame which is centrally supported by a two axis pivot point. Two torque motors are each connected to the frame with parallel diagonally opposed connecting members. The connecting members, when in the form of cables,... | 08/08/1989 |
| 4854670 | Wide angle optical filters A thin-film optical interference filter designed and manufactured to have high transmission of blue light and high reflectance of infrared light. The novel feature of this filter rests in the thin-film layer design at the top and bottom of a quarterwave s... | 08/08/1989 |
| 4852981 | Imaging lens system comprising a distributed index lens and a plano-convex lens An imaging lens system including a distributed index lens which has planar opposite end surfaces and in which the index gradient near the optic axis is substantially zero and the refractive index becomes progressively higher from the optic axis toward the... | 08/01/1989 |
| 4848881 | Variable lens and birefringence compensator Apparatus and method are disclosed for providing a variable lens and birefringence compensator (10) adapted to be used within the resonator cavity of a repetitively pulsed, variable rate, solid state laser. A cylindrical body of optical material (12) havi... | 07/18/1989 |
| 4848896 | Eye refractometer The present invention is directed to an eye refractometer, one embodiment of which, includes two-aperture stops positioned substantially conjugate with the pupil of the eye to be examined. Further, a two-dimensional light position detecting device is prov... | 07/18/1989 |
| 4846552 | Method of fabricating high efficiency binary planar optical elements The high diffraction efficiency regime of binary gratings occurs at periodicities on the order of a wavelength in order to produce grating which diffract radiation with efficiencies of greater than 90%, a fabrication procedure is disclosed which uses halo... | 07/11/1989 |
| 4846539 | Fθ lens system for use in light scanning device An fθ lens system is disposed between a rotating polygonal mirror for deflecting a light beam and a surface being scanned, for focusing the light beam deflected by the rotating polygonal mirror on the surface. The fθ lens system places the reflecting po... | 07/11/1989 |
| 4844584 | Semiconductor laser beam splitting device A semiconductor laser beam splitting device comprises a beam splitting optical system which is disposed on the optical path of light generated from a semiconductor laser and splits the light in a fixed proportion irrespective of the polarized light compon... | 07/04/1989 |
| 4842384 | Optical system of the Petzval type A catadioptric optical imaging system comprises a dioptric assembly (20) and a catoptric asembly (21), which are positioned with respect to each other to form an imaging system of long focal length. The dioptric assembly (20) comprises two confocal parabo... | 06/27/1989 |
| 4842353 | Diffraction apparatus with correcting grating and method of making A method of making a corrected plane holographic grating within one band of wavelengths, intended for use in a diffraction apparatus in which light emitted by an entry source (1) is collimated by a spherical mirror (2) to the grating (4), which reflects p... | 06/27/1989 |
| 4842370 | Optical spatial logic arrangement An arrangement for modifying an information carrying radiant energy beam array in which occurrences of a first prescribed pattern of radiant energy beams in the array are detected by producing images of said beam array and shifting the images relative to ... | 06/27/1989 |
| 4842385 | Zoom lens The disclosed zoom lens employs rear focusing with inclusion of two lens portions, or a varifocal portion and a focusing portion arranged respectively from front (object) to rear (image). The components of the varifocal and focusing portions are arranged ... | 06/27/1989 |
| 4842393 | Cuspated lens A cuspate lens is disclosed having a slope magnitude which decreases from a maximum at a central cusp to a minimum at the periphery. A radially symmetric version of the lens can focus light into a ring, or produce an annular beam. Also disclosed are a fib... | 06/27/1989 |
| 4840472 | Reflecting/refractive optical system A long focal length, super-large aperture ratio reflecting/refractive optical system employing easily workable spherical surfaces and which is suitable for use in an astrocamera or a super-telephoto lens system. The lens system includes four optical units... | 06/20/1989 |
| 4840455 | 3-dimensional optical viewing system An optical viewing system for producing a 3-dimensional effect is arranged to project two different and separated views of an object simultaneously along different optical paths onto opposite halves of a retina of a viewer's eye, or onto both eyes of a vi... | 06/20/1989 |
| 4839951 | Process for the installation of tubes in a steam generator The process comprises introducing the tubes in the form of horizontal layers (the generator can be positioned horizontally for this purpose), installing anti-vibratory bars on the layers, placing weights on the bars and checking the clearances between the... | 06/20/1989 |
| 4840478 | Method and article of manufacture for inserting contact lens The specification teaches a method of applying contact lenses to human eyes by sensitizing the fingers and applying the lenses to the eyes by sense of touch. Also taught are several preferred embodiments of means for sensitizing and cleaning the fingers w... | 06/20/1989 |
| 4840445 | System for locating an object in space A system for locating an object in latitude and longitude is disclosed. A rotating and oscillating mirror makes a laser beam deflect. A sensor fixed to the object indicates the locating instant. A screen that scatters and/or reflects towards a second sens... | 06/20/1989 |
| 4840474 | Furnace viewing system An optical adapter is installed between a standard lens tube and a television camera for inverting the image and for providing focus and intensity control. The adapter is provided with fittings which mate with both the standard lens tube and the camera. T... | 06/20/1989 |
| 4838647 | Display device with a dissociable structure, particularly for aircraft The invention provides a display device with dissociable structure, making t possible for a user to observe a synthetic light image superimposed in his natural field of vision, said device being formed as two dissociable modules, namely: an image generatin... | 06/13/1989 |
| 4838669 | Compact zoom lens system A zoom lens system having a short total length and a small outside diameter, comprising a front lens group having positive refractive power and a rear lens group having negative refractive power, and so designed as to change focal length by varying an air... | 06/13/1989 |
| 4838631 | Laser beam directing system A system for directing successive beam pulses of a pulsed laser into different optical fibers, for transmission therethrough, is disclosed. The system comprises at least one lens, a plurality of optical fibers with the tips thereof positioned proximate a ... | 06/13/1989 |
| 4838650 | Rear view mirror The present invention provides a rear view mirror for a motor vehicle which is automatically adjustable to prevent the effects of dazzle e.g. by a vehicle approaching from behind at night. The mirror comprises an adjustable mirror surface (2) housed in a ... | 06/13/1989 |
| 4838657 | Liquid crystal shutter A liquid crystal light shutter having means for stabilizing molecular orientation of a liquid crystal material is provided. In one embodiment of the invention, isolation electrodes are provided parallel to and between adjacent common electrodes on a subst... | 06/13/1989 |
| 4836665 | Objective lens An objective lens having a stop provided most adjacent to the image side comprises, in succession from the object side, a first lens which is a positive meniscus lens having its convex surface facing the object side, a second lens which is a biconcave len... | 06/06/1989 |
| 4836661 | Optical system of variable magnification power In the disclosed optical system of variable magnification power, at least one component A of two components A and B has its refractive power varied so that the focal length of the entire system can be continuously varied throughout a range while maintaini... | 06/06/1989 |
