Abstract: A retroreflective marking material is disclosed comprising a sheet having at least some light-transmitting portions, a light-refracting surface on one side, and a plurality of trihedral light-reflecting units of three mutually perpendicular facets on the other side adapted to be adhered to a working site. The light-reflecting units are oriented to reflect light having relatively high angles of incidence with respect to the sheet. The marking material may be used as a tape for marking roads or as a vertical sign and is effective whether wet or dry. Optionally, the sheet or tape has light-receptors which rise above the tape and are spaced apart along one direction of the tape, and the trihedral light-reflecting units are substantially opposite the light-receptors. Preferably, the light-reflecting units have the shape of a triangular-based pyramid, and the marking material retroreflects light in two opposite directions.

Abstract: A two-dimensional scanning device constructed with first deflector to deflect a collimated beam, second deflector to deflect an incident beam in the direction orthogonally intersecting the deflecting direction of the first deflector, a scanning lens interposed between the first and second deflectors, a scanning plane to focus a scanning beam from the scanning lens through the second deflector, and an expedient to obtain a distortion-free two-dimensional scanning pattern on the scanning plane by rotating the scanning plane around a rotational axis in the direction orthogonally intersecting the deflecting direction of the second deflector in synchronism with rotation of the second deflector.

Abstract: A light diffusing surface structure is provided for a light guide in a passive information display wherein the surface geometry of regular texture is formed by portions of circular cylinders having their axes parallel to the general plane of the surface such cylinder portions intersecting one another at angles of 60.degree. or 90.degree. and producing a continuous diffusion at any angle of vision.

Abstract: Disclosed is apparatus for reflecting incident radiative energy back to a source. The apparatus features at least two planar reflecting facets which intersect at an angle and which are mounted for adjustment of the angle between the adjacent facets. The facets are oscillated in phase to sweep the angle between .pi./2 and .pi./2-.delta. radians. The angle .delta. is selected so that the plane of maximum areal energy density crosses the plane which includes the source. This apparatus thus compensates for the effects of dispersion with known retroreflectors.

Abstract: A light beam scanning device for scanning by a light beam a member to be scanned which is subjected to relative continuous feeding, comprising a main-scanning means for causing said light beam to scan said member to be scanned in a direction vertical to the direction in which it is fed, and a correcting sub-scanning means for causing said light beam to scan said member to be scanned in the direction in which it is fed, whereby the loci of scanning of said light beam on a surface to be scanned of said member become substantially parallel.

Abstract: A multiplanular image creating device includes a housing having a viewing port and primary and secondary image generation chambers therein. The primary chamber is divided into a plurality of cells, each of which contains an image source such as a portion of a video display tube surface or an actual physical object. A plurality of light transmissive two-way mirrors are disposed between the cells and the viewing port. The mirrors may be arranged to increase the perceived depth of field beyond the confines of the image source itself. The mirrors may be selectively movable relative to each other to provide the illusion of movement of a fixed image source. Variations in light intensity of the different images reaching the viewing port may be adjusted or equalized. Non-parallel two-way mirrors may be placed in the light travel path to create multiple images. The secondary image creation chamber contains fixed or movable shelves of varying widths.

Abstract: The present invention relates to a side piece for spectacle frame, adapted to take a normal position with slight horizontal clearance and a firm holding position in which the curved rear tip is applied against the ear, wherein said side piece is formed by a sheath in which slides a piece which is urged by a spring in the direction of the lens-bearing face and which is normally immobilised by a blade abutting against a fixed socket. A push button enables the piece to be released when desired. The invention is more particularly applicable to the spectacle or sunglasses industry.

Abstract: The invention relates to an improved spectacle frame in which a curved auxiliary bridge is provided below a bridge rigidly joining the rims of the spectacle lenses, this auxiliary bridge being turnably mounted between the rims in such wise as to freely adapt to the slope of the nose of the wearer.

Abstract: The reflectivity of a reflex reflector device comprising a reflex reflector element having corner cube reflecting elements on a rear surface thereof is improved, particularly at high entrance angles, by the provision of a second reflex reflector element behind the first reflex reflector element. The second reflex reflector element has corner cube reflecting elements which are on a rear surface thereof and which have a linear size five to ten times smaller than that of the corner cube reflecting elements of the first reflex reflector. Further improvements can be obtained if the corner cube reflecting elements of the second reflex reflector are angled relative to the front surface of the first reflex reflector.

Abstract: This invention relates to a device for splitting a light beam applicable to a light metering apparatus of a single lens reflex camera. Having a diffraction lattice structure built in the condenser lens, this device has both a beam splitting function and a light condensing function. More in detail, this device includes a condenser lens section and a transparent sheet having a diffraction lattice in one portion which are interconnect by having a lower index layer inbetween. One portion of the light that passes through the taking lens of the camera and is incident on said transparent sheet is diffracted by said diffraction lattice, and further the diffracted light is totally reflected at the boundary surface between said lower index layer and transparent sheet, and transmitted to the end surface of the transparent sheet when it is detected.

Abstract: A dimmable rearview mirror, particularly for motor vehicles comprising a reflective surface, two polarization filters spaced apart from each other and arranged in front of the reflective surface as seen in the direction of observation. A liquid crystal cell is disposed between the two polarization filters and includes cell glasses enclosing a liquid crystal substance. The cell glasses are provided with electrodes, the electrodes surfacewise covering essentially the entire surface of the reflective surface. A switchable and/or variable source of voltage is connected to the electrodes for adjusting the degree of reflection of the rearview mirror.

Abstract: An improved microscope stand of an extremely rigid, deep-throat, substantially c-shaped, hollow construction having an extremely high effective modulus of elasticity and stiffness of an extended microscope-optic-supporting upper cantilever arm relative to a lower base portion whereby to minimize any relative vertical displacement therebetween which might tend to produce a de-focusing action of such microscope optics and adapted to controllably positionally adjustably mount a large work stage in an intermediate focusing plane within a deep-throat portion of the stand, and providing controlling large magnitude movement thereof in mutually perpendicular, substantially horizontal, x and y directions, and with the hollow construction providing interior mounting of electrical and electronic accessory equipment and maximizing the strength-to-weight ratio of the entire stand.

Abstract: A rear view vision mirror attached to a pair of spectacles.

Abstract: The disclosure describes an enclosed area (19) between a beamsplinter (11) and a curved reflective surface (12), two end surfaces (20) and (21) and a top membrane (22). The space (19) is hermetically tight and encloses a suitable dry gas, such as nitrogen. With a device constructed in this manner positioned adjacent a suitable television tube, such as CRT (17), the device will function as is well known, but cleaning and damage to optically coated surfaces is eliminated completely.

Abstract: This is a corrugated light reflective ring made from thin flexible material and having a light reflective surface on both sides thereof and adapted to be intertwined between the spokes of a bicycle wheel. This invention also embodies the method of making a corrugated light reflective ring.

Abstract: A device for reading coded notches on keys, the device comprising a magnifier having parallel lines marked on one face, the lines being spaced apart in accordance with the code and each line being indicated by a coding index, the magnifier having a groove for the reception of a key and an abutment to locate the key in a correct position relative to the lines.

Abstract: This invention relates to safety fender trims mounted vertically on fender flanges at the motor vehicle wheel openings which not only perform improved water splash arrest and mud guard functions, but, with motor vehicles of increasingly varying widths on the roads, the trims primarily augment night driving safety particularly for the user, as well as others. Light reflective disc targets are bonded to fender trim extensions on the user car to reflect rearwardly, forwardly, or preferably both rearwardly and forwardly, the head light beams of other vehicles to pinpoint the presence of the user car in traffic, its width, and whether it is moving or parked.

Abstract: A pair of novelty eyeglasses includes a frame for supporting them on the wearer's head and a pair of transparent lenses. The frame includes a pair of support earpieces connected by hinges to the frames. Two light emitting diodes or LEDs are secured to the frame, one adjacent each lense and connected to a portable source of power, such as small batteries, mounted in one of the earpieces. A hinge switch, defined at one of the hinges connecting one of the earpieces to the frame, must be closed by moving the respective earpiece to the open position before the LEDs can be actuated. A manually actuatable switch is secured to the frame in series with the batteries and the light emitting diodes. The manually actuatable switch can be selectively closed by the user to energize the LEDs thereby creating a novel effect.

Abstract: A light beam scanning system in which deviations perpendicular to the scanning direction of the scan line due to parallelism deviations of a rotary multi-surfaced mirror are eliminated. A first linear image pattern is formed on the reflecting surface of the mirror parallel to the scanning direction by a connex cylindrical lens. The image is reflected to a first convergent lens which forms a second linear image perpendicular to the scanning direction then passes through a concave cylindrical lens which diverges the light in a direction perpendicular to the scanning direction. A second convergent lens converges the beam to form a point image on the scanned surface.

Abstract: A mirror assembly capable of providing an image of high or low brightness is pivotally supported by a housing or other stationary support, for movement between two operating positions to provide the high and low brightness images. For automatic actuation of the mirror assembly, a light sensitive element is provided which on sensing a change in the intensity of incident light, energizes an electromagnet or electromagnets affixed to either of the mirror assembly and the stationary support. The energized electromagnet or electromagnets attract and/or repel a permanent magnet or magnets affixed to the other of the mirror assembly and the stationary support. Normally, the core of the electromagnet or of one of the electromagnets is held attracted by the permanent magnet or by one of the permanent magnets to retain the mirror assembly in a selected one of the operating positions.