Abstract: A welder's helmet (1) provided with a fast filter (3) which is controlled by welding light and through which the wearer of the helmet can see clearly in the absence of welding light. In accordance with the invention, the helmet is complemented with side windows (4) operative to filter out IR and UV radiation and having a moderate filter effect for visible light.

Abstract: An optical information reading apparatus for optically reading information recorded on a recording medium with a laser light beam emitted from a light source. The apparatus comprises a hologram device for receiving at its center portion a laser light beam. The hologram diffracts the received light so as to produce a first diffracted light beam and is arranged to receive at its entire surface light to be reflected from the recording medium and to diffract the received light so as to produce a second diffracted light beam. This hologram device is arranged to be driven by a motor so as to move the first diffracted light beam for a scanning operation. Also included in the reading apparatus is a reflection assembly for reflecting the first diffracted light beam from the hologram device toward the recording medium and further for reflecting light reflected from the recording medium toward substantially the entire surface of the hologram device whereby the hologram device produces the second diffracted light beam.

Abstract: A mirror is mounted to the roof of a vehicle by a pivot arm assembly for pivotally coupling the mirror to a vehicle for movement from side to side and for movement between a raised stored position and a lowered use position. In a preferred embodiment, the pivot arm has one end pivotally mounted to a housing for storably receiving the mirror and an opposite end coupled to the mirror using both a hinge and a ball joint to allow compact storage of the mirror in the housing and full adjustability for use.

Abstract: A pair of specified metal glasses for displaying removable magnetic printed matter includes a frame for supporting the lens of the pair of glasses. The frame is of a predetermined thickness for displaying removable printed matter thereon. Temples are provided for extending from the frame for supporting the glasses relative to a wearer's ears. The temples are of a predetermined thickness for displaying removable printed matter thereon. A retaining member is provided for temporarily retaining printed matter relative to at least the frame or the temples for predominantly displaying the printed matter for viewing by others. The retaining member may include a plurality of grooves disposed within a thickness of the frame and temples for mating with corresponding projections extending from the removable printed matter. The retaining member may include a plurality of projections extending from the frame and temples for mating with corresponding grooves disposed within a thickness of the removable printed matter.

Abstract: A plastic lens having an anti-reflecting and hard coat layer is provided. The anti-reflecting layer is formed by coating a lens with a hard coat solution containing at least one oxide sol, hardening the coated solution to give a hard coat layer and immersing the lens into an acidic or alkaline solution to dissolve the oxide particles contained in the hard coat layer so as to make the layer ununiform. The anti-reflecting effect of the formed layer is equivalent to that of a conventional anti-reflecting film consisting of three or more than three layers.

Abstract: A thin film, light absorbing coating comprises an analog structure fabricated by the simultaneous codeposition of absorbing and non-absorbing material. The two materials may comprise a non-absorbing dielectric material, such as silicon monoxide, and a metal, such as chromium, that is absorbing over the desired wavelength range. Individual evaporation rates for the two materials are adjusted during the codeposition process to achieve a continuously graded quintic transition between the absorbing material and the non-absorbing material. The continuous grading of the composition allows good light absorption properties to be maintained over a wide range of wavelengths. The total design thickness of the absorbing coating is on the order of a full wavelength of light. All wavelengths of incident light shorter than the design wavelength are absorbed into the coating. The coating is useful as a broad band light absorbing layer between a substrate and a spectrally selective reflective surface layer.

Abstract: An aerodynamic vehicle side mirror head of the vertically elongated rectangular type commonly used on large vehicles such as trucks includes an aerodynamically shaped mirror housing having a reflecting surface mounted to a rearward facing surface thereof and a set of cambered, airfoil-shaped, turning vanes with an upstream vane located along the leading vertical edge of the mirror housing on the side thereof closest to the vehicle can and having an outlet disposed to direct airflow exiting therefrom laterally onto the mirror surface and a downstream vane located along the trailing vertical edge on the opposite side of the mirror housing and having an outlet disposed to direct air flowing therethrough in a substantially downstream direction.

Abstract: A manually operated remote control type door mirror having a base unit and a bracket unit which are separate from each other and can be assembled integrally, wherein the base unit comprises an attaching stay to be attached on the side of a vehicle body, a base extended from the attaching stay, a manipulation lever supported turnably to the attaching stay with one end being protruded to the inside of the vehicle body and with the other end being exposed to the inside of a recess formed in the base, and the bracket unit comprises a cylindrical member having one end to be combined with the recess of the base and a shaft having one end extended from the cylindrical member a bracket supported to the cylindrical member and a mirror tiltably held to the bracket and connected by way of a link mechanism to the mirror and the other end.

Abstract: A mirror for a motor vehicle sun visor has a reflective member having a reflective surface; a frame having a frame portion for the reflective member and a U-shaped extension having inner facing surfaces and extending substantially perpendicularly to a longitudinal axis of the frame portion; a hinged cover for concealing the reflective surface of the reflective member; elements for retaining and pivoting the hinged cover provided in the U-shaped extension and including two projections extending from the inner facing surfaces, the projections having longitudinal axes aligned with one another; and other elements for coupled the hinged cover with the frame including U-shaped clamps extending substantially obliquely from the hinged cover and having an external contour corresponding to a contour of the projections, so that when the clamps and the projections engage with each other the hinged cover can pivot and occupy a plurality of positions.

Abstract: A mirror for use in a shower or other location which is formed of a thin sheet of impact-resistant material having a reflective front surface and a smooth back surface. The sheet of material is light in weight relative to its area. It is temporarily adhered to a smooth, substantially vertical, flat support surface, such as a shower wall, in a stable position by a liquid film applied to either the mirror or the wall. A method of mounting a mirror in the form of a thin, lightweight sheet having a reflective front surface to a smooth, flat wall including the steps of wetting either the mirror or wall, and adhering the mirror to the wall by pressing the mirror against the wall to form a liquid film behind the mirror is described.

Abstract: An optical system which contains multiple images comprised of two or more images at varying focal distances, which when viewed consecutively and in repetition will exercise the ciliary muscle of the eyes. The optical system may have its own power to illuminate said images. The shifting of conditions of the viewer to alternate the viewing of one image and then the other, may involve the physical movement of the user's head, the system may contain a motor coupled to rotate said system, or the configuration of the lighting source(s) shall illuminate one image and then another. The system may include a clock-timer and control of the variable speed of illumination between one optical image to another. The system may include a sound alarm to remind the viewer to utilize the holographic system.

Abstract: A three dimensional display system includes a laser for generating a laser light signal. The signal is expanded and collimated using a traditional lens system and is directed to an acousto-optic modulator wherein it is modulated to generate a three dimensional image such as a holographic image. The modulation signal for the modulator is provided by a data processing system. The data processing system applies signals to the modulator that encode a diffraction pattern. The diffraction pattern is realized by the modulator upon application of the signals and the three dimensional image is produced by the modulated light signals. The image is demagnified by a demagnifier, and subsequently, imaged by a viewing lens. A horizontal scanner continuously multiplexes segments of the holographic image and compensates for the motion of segments across the modulator. A vertical scanner is provided to properly vertically position horizontal lines of the holographic image.

Abstract: A hologram scanner includes a reproducing light source for generating a collimated reproducing light beam, a hologram disk being adapted to rotate, and a hologram disposed on the hologram disk for deflecting the reproducing light beam by diffraction so as to scan an image surface by the deflected reproducing light beam during a rotation of the hologram disk. The hologram has interference fringes recorded by a mutual interference of an object light of divergent spherical wave and a reference light of divergent spherical wave. The object light is generated by an object light source positioned at a first position apart from a hologram recording plane of the hologram disk, on which the hologram is to be recorded, by a first distance. The reference light is generated by a reference light source positioned at a second position apart from the hologram recording plane by a second distance.

Abstract: This invention relates to a rear side mirror for vehicles and in particular to one including a front side with a flat surface and a rear side having a first planar surface gradually decreased in width from an inner edge to a vertical lateral edge, a second surface concaving from a vertical outer edge towards the first planar surface, and a third surface concaving from a lower edge towards the first planar surface.

Abstract: In order to coat a substrate by a transparent coating of a medium refractivity, consisting substantially of at least one metal oxide mixture a coating of an at least substantially homogenous mixture of up to about 80 percent by weight praseodymium oxide and the balance aluminum oxide is used. The coating includes 20 to 88 percent by weight, preferably 30 to 80 percent by weight praseodymium oxide. This reflection reducing transparent reflection reducing transparent coating having at least one metal oxide mixture is specifically suitable for the coating of optical substrates.

Abstract: A diagnostic system for support of laser ocular surgery, for example, solves a problem of competition for light which is often encountered when a series of different detectors are used to receive and detect features of a target reflecting an illuminating light beam. The intensity of an illuminating beam, particularly in eye surgery, is limited to a level above which damage to the eye can occur. In a system wherein a plurality of successive beam splitters are used, each reflecting a portion of the light intensity and transmitting the remaining light intensity, the series of detecting devices compete for adequate light intensity for the particular functions being served. The system of the invention solves this problem and increases the effective quantity of light useful from a given input intensity by dividing the light spectrally after its reflection from the eye, thereby making use of a different spectral range of the light at each of the plurality of different detecting devices.

Abstract: A dish reflector and method for concentrating moderate solar flux uniformly on a target plane on a solar cell array, the dish having a stepped reflective surface that is characterized by a plurality of ring-like segments arranged about a common axis, and each segment having a concave spherical configuration.

Abstract: A compact, self-contained monolith hologram display apparatus includes a laser diode mounted on an edge of a solid glass plate having a front surface with a hologram mounted thereon. The beam is expanded within the glass plate and is reflected off an opposing mirrored contoured edge surface that collimates the beam and directs it onto an angled reflection grating. The reflection grating is mounted onto an edge which is canted with respect to the front surface. The reflected beam diffracts from the grating and impinges upon the hologram to provide for reconstructed image that has achromatic properties.

Abstract: An optical beam scanner incorporating an array of beam deflection elements commonly controlled to steer an optical beam impingent on the array is described. The beam steering elements are arranged in the array as individually controlled elements and the deflection of the beam is accomplished by setting the phase tilt and the phase offset of each element according to a calculation which removes modulo 2.pi. phase shift from the required position relative to a flat plane. Thus, the array elements can be thin and need only supply about 2 radians of phase shift. These elements may be incorporated in a planar array using beam deflection elements such as liquid crystal beam deflectors by choosing a drive scheme representing either a blazed array or a flat piston array.

Abstract: An optical system particularly for a laser beam printer comprising a semiconductor laser, a collimating lens, a cylindrical lens having curvature in the sub-scanning cross section, a deflector and anamorphic scanning lens system concentrating the light on a scanning plane. The anamorphic scanning lens system may have one to four lenses but has one lens with a convex toric surface facing the scanning plane. The anamorphic scanning lens system has stronger power in the sub-scanning cross section than in the main scanning cross section.