Abstract: The present invention provides a zoom lens system comprising, in order from the object side, a first lens unit G1 having a positive refracting power; a second lens unit G2 including a front subunit having at least one negative lens and a rear subunit having at least one negative lens and at least two positive lenses located more closely to the image side than said negative lens and having a positive refracting power as a whole, said front and rear subunits having a positive composite power; and a third lens unit G3 having a negative refracting power; said first, second and third lens units including gaps between them, which are variable for zooming from the wide to tele position.

Abstract: A zoom lens includes sequentially from an object side toward an image surface side a fixed first lens group, a movable second lens group, a fixed third lens group, and a movable fourth lens group. The fixed first lens group is constituted by a first concave lens, a first convexo-convex lens, a second concave lens, a second convexo-convex lens and a meniscus convex lens. The movable second lens group is constituted by a meniscus concave lens, a concavo-concave lens and a convex lens. The fixed third lens group is constituted by a single lens having at least one aspherical surface. The movable fourth lens group is constituted by a concave lens and a convex lens, at least one of which has at least one aspherical surface.

Abstract: The article includes an eyeglass frame (12) and two lenses (14, 16). Each lens has a film (18,20) on one surface thereof which is changeable between an opaque condition and a transparent condition, controlled by an electrical circuit (22).

Abstract: A lamp projecting a high-intensity optical beam of spectral radiation, with an IR-extracting (cooling) array including an IR-dissipating "black-box" arranged to receive IR and convert it to box-heat, plus an IR-diverting "hot-mirror" interposed along the beam to divert (only) the IR to this "black-box".

Abstract: A scanner comprised of an upper shell connected to a bottom shell to hold an intermediate plate, a scanning lens assembly, a reflector, a LED assembly, and a plurality of printed circuit boards, wherein said scanning lens assembly and said reflector are mounted on said intermediate plate held in between said upper shell and said bottom shell, and said LED assembly is supported on said intermediate plate at a front edge thereof, and therefore said scanning lens assembly, said reflector and said LED assembly are retained in place when said upper and bottom shells are squeezed to deform.

Abstract: A sideview mirror includes a housing having an inner tubular member and an outer tubular member. The housing has a main pipe and a branching pipe extending laterally from a center portion of the main pipe. An object lens system is arranged in a rearward portion of the main pipe, and an eye lens system is arranged in the branching pipe. A blowing device is provided in the forward portion of the main pipe. The main pipe further includes a reflecting member in its center portion to form a predetermined angle with respect to an optical axis of the eye lens system. The blowing device includes a cover plate which has through holes as air apertures and a movable plate having air apertures. The air apertures of the cover plate and the movable plate may be selectively aligned to allow air to enter the mirror. An air guider is provided to guide the entering air to the object lens system and the eye lens system.

Abstract: Methods of making gradient property refractive elements such as gradient index lens blanks. The spatial distributions of constituents achieved by subjecting various starting assemblages to various diffusion conditions are predicted. Each such predicted spatial distribution of constituents is converted to a spatial distribution of the graded property. The property distribution which best approximates a desired distribution is selected, to thereby select one starting assemblage and one set of diffusion conditions. That assemblage and set of conditions are used in fabrication of the element.

Abstract: A viewing device for installation on a wall or door includes a housing projecting from the front surface of the door and defining a plurality of surveillance ports disposed axially, and non-axially relative to the axis of the housing. By means of a knob extending outwardly from the rear door surface and defining a viewing port axially aligned with the axial surveillance port, the user is able to move a mirror between a first orientation intersecting the housing axis at an acute angle and a second orientation parallel to and spaced from the housing axis. Rotation of the knob relative to the housing causes rotation and pivoting of the mirror so that, when the mirror is in the first orientation, a line of sight is defined at different times from the viewing port through each of the non-axial surveillance ports via the mirror and, when the mirror is in the second orientation, a line of sight is defined from the viewing port directly through the axial surveillance port.

Abstract: In an optical isolator, first, second and third birefringent crystals shaped in a flat plate are arranged in order in a forward direction in which a light beam advances and formed in ratios 1:1:1 in thickness. One magneto-optical member is interposed between the first and second birefringent crystals and another magneto-optical member may be arbitrarily disposed between the second and third birefringent crystals. Since the birefringent crystals are equal in thickness, the optical isolator can be readily produced with a high accuracy without much labor.

Abstract: A method for converting a 2-D image into a hologram is set forth. An optical scanner system which measures the primary color intensity of a selected pixel and forms an indication thereof is disclosed. The location of the pixel is output as XY coordinate data. The location and color data is stored in memory, and the memory is thereafter retrieved. A pixel is located on a blank, and a laser beam split into four equal segments is focused along four separate pathways to the pixel location. Interference fringes formed at the point of convergence on the blank enables transfer of a single pixel, and multiple pixels are transferred so that the entire image is reproduced.

Abstract: An optical apparatus having a mount molded of plastic comprises a mount sliding surface formed on the mount and providing a fiducial surface in the direction of the optic axis, and a depression formed in the area of a parting line during molding on the mount sliding surface.

Abstract: A laser optics device comprises a semiconductor laser and a lens system spaced in a defined distance from each other. The semiconductor laser and the lens system are aligned along an optical axis. To keep the laser and lens system fixed and adjusted with the optical axis in spite of thermal expansions, the semiconductor and the lens system are supported within a sleeve having axial slots. The slots extend along a substantial part of the length of the sleeve. Compressible rings are provided for radial elastic compression of the sleeve in the area of the slots. The lens system and the semiconductor laser thereby are clamped elastically in a centered position within the sleeve which is mounted within the cylindric bore of a housing member.

Abstract: Disclosed is a photo-deviometer by which accurate and reproducible measurements and photographs are obtained on a wide range of patients of all ages and ethnic background affected by strabismus.

Abstract: A multicomponent, multilayered, highly reflective polymeric body which is thermoformable and capable of being fabricated into films, sheets and a variety of parts while maintaining a uniform reflective appearance is provided. The reflective polymeric body includes at least first, second, and third diverse polymeric materials having a sufficient number of alternating layers of the polymeric materials such that a portion of the light incident on the body is reflected. A sufficient number of the individual layers of the body have optical thicknesses of not more than 0.09 micrometers or not less than 0.45 micrometers, such that there is an absence of visibly perceived color in the body. The polymeric materials having the highest and lowest refractive indices differ from each other in refractive index by at least about 0.03. The reflective body may be fabricated into mirrors, noncorroding metallic appearing articles and parts, reflectors, reflective lenses, and the like.

Abstract: A device for microscopic sectioning and imaging of an object specimen illuminated with light comprises an objective lens, a diaphragm, and a pixel filter array. The objective lens focuses light from the object specimen to an image focal plane. The diaphragm blocks a portion of the focused light from the objective lens thereby creating a shadow. Each pixel filter in the pixel filter array has an axis and is arranged so as to cooperate with the shadow so that light from an object focal plane and parallel to the pixel filter axes reaches an output image plane.

Abstract: A method and apparatus for producing temporally coherent, full color holograms is disclosed whereby a linear array of stereographically positioned cameras are simultaneously triggered to obtain a temporally coherent sequence of full color exposures. The exposures are then sequentially exposed upon an H1 plate using multiple wavelength, "white" laser light to obtain a virtual full color hologram image in a single step operation.

Abstract: A pair of non-prescription eyeglasses is mounted on a cantilevered support by a hanger that includes an element constructed of relatively stiff resilient plastic material. Such element includes a relatively wide main section having an aperture which receives the support arm, and a relatively narrow extension. The latter passes through the nose gap of the eyeglasses and is reversely bent to form a loop that surrounds the eyeglass frame bridge. In a first embodiment of this invention a rivet maintains the loop closed and prevents casual removal of the hanger from the eyeglasses. In a second embodiment a snap-type device holds the loop closed. This snap-type closure cannot be opened casually, at least for the first opening thereof.

Abstract: An illuminating optical system for use in a microfilm reader/printer or the like for illuminating a film comprises an axially symmetric lens system and an anamorphic lens system. The anamorphic lens system includes a condenser lens opposed to a light source. A microfilm reader/printer having such an illuminating optical system causes the axially symmetric lens system to illuminate the microfilm during a reading operation, and the anamorphic lens system to illuminate the film during a printing operation.

Abstract: An electrochromic system. It comprises layers of solid/materials deposited on glass or another substrate. The solids function in an atmosphere that can be dry. One layer is preferably Li.sub.3 AlF.sub.6 and conducts positive lithium ions. Another layer is a counterelectrode. The counterelectrode is improved to the extent that it can reversibly accept ions from and donate them to the ion conductor while remaining extensively transparent. The counterelectrode can be Li.sub.x TiO.sub.y, (Li.sub.2 O).sub.m (WO.sub.3).sub.n (Sb.sub.2 O.sub.3), or (Li.sub.2 O).sub.m (WO.sub.3).sub.n (CeO.sub.2).sub.o.

Abstract: A large-aperture single lens with aspherical surfaces to be used as a pickup lens for video disks, especially for tracking the video disk by directly moving the pickup lens. It is preferable that the single lens is made of plastic material in order to make it compact and light in weight. Both refractive surfaces of the single lens are arranged to have positive refractive powers in order to make the working distance of the lens long. Spherical aberration of the single lens is corrected to the degree that the diameter of the circle of confusion thereof is decided approximately by diffraction of light. Both refractive surfaces of the single lens are formed as aspherical surfaces and the shapes of the refractive surfaces are determined so as to correct aberrations including the sine condition to the required range, by taking the error to be caused at the time of manufacture into consideration.