Abstract: An optical system for recording and reading information on an optical information medium such as a video disk, a mini disk, a magneto-optical disk, and a phase change disk. The optical system includes: a light source for irradiating the optical information medium with a light beam through a coupling lens and a objective lens; the coupling lens which is a spherical single lens; and the objective lens which is a double-sided aspherical lens and provided movable along an optical axis of the light source; in which the light source is located between the coupling lens and a focal point, at a side of the light source, of the coupling lens. The optical system defines the number of a numerical aperture on the side of the optical information medium, and a lateral magnification ratio of the optical system.

Abstract: Automotive display apparatus in which a display image of the displayer is recognized from an eye range as a virtual image within a displaying range of a first reflector plate through a face plate which is disposed between the first reflector plate and the eye range.

Abstract: The apparatus is a laser transmitter and receiver unit with independent adjustment of the focus of each and preservation of precise parallel alignment between the two lines of sight. The transmitter laser and the receiver photodetector are each mounted in a precisely machined two part mounting assembly. The first part of both mounting assemblies includes an objective lens and is fitted against the same precise surface of a reference fixture. The second part of each mounting assembly, holding the laser or photodetector, is connected to the first part by means of precisely mated coaxial sliding cylinders, so that the laser or photodetector can be replaced on the fixture with high accuracy. Axial adjustment of the distance of the laser or photodetector from their respective objective lenses is furnished by spacer washers inserted between the two parts of the assemblies.

Abstract: Multilayers of low refractive index amorphous silicon nitride and high refractive index amorphous silicon are interleaved to construct a near-infrared optical filter. For an edge filter, the structure is transparent to near-infrared light and opaque to visible light. For a band-pass filter, the low-pass filter is superimposed with a high-pass filter. Anti-reflection coating can be added to improve the transmittance. These multilayers are deposited with Plasma Enhanced Chemical Vapor Deposition technique.

Abstract: This disclosure refers to the securing of lenses in an ophthalmic mounting having a split rim eyewire using a spring loaded connecting device.

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: Lead terminals of a plurality of motors disposed inside a drive unit casing are lead out through a plurality of elongated through-holes formed in the casing and connected to a plurality of power-supply sheathed wires by connecting terminals. A plurality of elongated concavities is formed adjoining to the corresponding through-holes on the outer surface of the casing. With the connecting terminals connected to the plurality of sheathed wires, the plurality of lead terminals extended from the motor are bent through a nearly right angle at the open ends of the through-holes along the outer surface of the casing and the connecting terminals are forcibly fitted on the side walls of the elongated concavities. Therefore, the electrical connection between the lead terminals extended from the plurality of motors and the plurality of power-supply sheathed wires needs no soldering.

Abstract: A method and an apparatus for making a hologram wherein interference patterns to be recorded on a hologram plate are prevented from travelling, thereby enabling a high quality hologram to be made.