Abstract: This disclosure is concerned with providing a marker strip for attachment to roadways and other surfaces, comprising an upper layer of spaced transverse prisms and a lower layer of retroreflective sheeting, providing direction color discrimination, where desired, and substantially constant brightness of light retroreflection with distance over wide angles of incident light upon the strip.

Abstract: An optical system has an objective lens for focussing on a dotted information carrying video disc the light emitted from a light source of semiconductor laser whose radiant region has different longitudinal and lateral dimensions, and a coupling lens disposed between the objective lens and the laser source for condensing the light from the laser source. The coupling lens has a magnification factor of not greater than 7.

Abstract: A combined motor and rotational cell for use in an apparatus for measuring components in a gas colorimeter, smoke meter, etc. by utilizing light absorption or fluorescence. The combined motor and rotational cell has a motor with a plurality of magnetic poles around the periphery of thereof, at least one diametrically extending partition wall extending across the hollow interior for defining at least two compartments in the rotor, and optically transparent windows on the outside of the motor closing the compartments. A plate-shaped chopper is provided on one side of the rotor having a plurality of apertures therein equidistantly spaced around the chopper. A casing surrounds the rotor and supports the rotor shaft in bearings and has a plurality of coils around the inside of the peripheral wall opposed to the magnetic poles on the rotor. Apertures are provided in the opposite end walls of the casing aligned with the compartments in the rotor for passing light through the casing and the rotor.

Abstract: A reflector useful in dental surgical lighting systems has been developed, which reflector is derived from at least one base ellipsoid surface which has been divided into sections, each section being rotated outward so as to provide the cumulative effect of several ellipsoidal segments to produce a beam pattern of desired width.

Abstract: An illumination system for bright field/dark field microscopy has a swinging deflector which is normally positioned on the optical axis when bright field microscopy is used and which is swung off the optical axis when dark field microscopy is used. When the deflector is swung off the optical axis an alternate illumination axis is utilized to provide a reduced portion of the observation axis having coaxial counterflowing light passing there along.

Abstract: This invention consists of a light reflecting sign for attachment to railway cars for the prevention of accidents when such cars are stalled or parked across minor, poorly lit country roads. It is in the shape of a horizontal "X" resembling a "railway crossing" sign the face of which is lined primarily with red flat plastic light-reflecting strips which are tipped at the ends of the sign with small yellow angular surface reflectors.

Abstract: An assembly for baffling an associated optical system from off-axis radiation and, at the same time, reducing the thermal load by minimizing radiation absorption within the assembly. In its most basic embodiment, the assembly comprises: a rectangularly-shaped box-like housing having a specular internal surface; and, specular baffles that are sections of surfaces of hollow elliptic cylinders and that are positioned within the housing in spaced-apart relationship to each other and in a one-behind-the-other arrangement, and also are perpendicular to the sides of the housing.

Abstract: A defogging system for eye glasses comprising an electrical circuit means associated with the frame of the eye glasses. A first electrical contact is positioned on one side of each of the rims thereof so as to be in contact with the lens when in position in the rim, and a corresponding second electrical contact, not contacting the first, is located on the opposite side of each rim so as to be in contact with the lens when in position in the rim. An electrical circuit means is provided to carry current from a power source positioned in the frame to the first electrical contacts in the rims and from the second electrical contacts in the rims back to the power source. Appropriate on-off switch means are provided. The rims of the eye glasses are provided with lenses coated with a conductive transparent film, the film being in electrical contact with the first and second electrical contacts.

Abstract: A target is disclosed for intended use with light-emitting, including laser-emitting, electronic distance measuring equipment. The target includes a body having a substantially spherical surface to which a plurality of discrete multi-faceted return reflective elements are fixed. A plurality of guard pegs are interspaced between the reflective elements and extend outward from the surface of the body substantially beyond the outer surface of the reflective elements for protecting the reflecting surfaces from abrasion.

Abstract: A collapsible lens shade comprises a foldable bellows connected between front and second plate-like members. A track member is pivotally connected to one of the front and rear plate-like members, preferably the front member, and locking means is provided for locking the track in a position extending from the member to which it is pivotally connected. Slide means is coupled to the other of the front and rear members to permit same to slide along the length of the track member when the track member is in its extended, locked position, and second locking means is provided for locking the slide means at selected positions along the length of the track means. Replaceable adaptors are preferably provided to enable the lens shade to be used with lenses of various barrel diameters. Also, means for inserting filters or other special effect plates is provided, as well as a flash or accessory shoe.

Abstract: Retroreflective sheeting having a plurality of retroreflective cube corner prisms distributed over one of its surfaces is described. The prisms are disposed in a planar array having a plurality of zones of prisms having differing angular orientations such that the zones have differing retroreflective brightness when illuminated by a light beam at a high angle of incidence. The zones are small enough to be substantially unresolvable by the unaided human eye at the expected viewing distances, so that the sheeting appears to have uniform retroreflective brightness when viewed at a high angle of incidence.

Abstract: This invention provides a reflector adapted to be mounted on the spokes of a spokewise bicycle wheel or the like, such reflector including a plate-like reflector body having reflective surfaces each provided with reflective zones capable of reflecting incident light in generally parallel relation thereto. This reflector further comprises a through hole relative to said reflective surfaces, a nut portion which is coaxially movable in the through hole, a hook member, a bolt portion affixed to said nut portion, a fixing means and a rotation-restraining means. The hook member is integrally formed with one end face of said nut portion and extends therefrom in the axial direction. The bolt portion is provided for firmly pressing a spoke against the inside face of said hook member.

Abstract: The invention relates to illuminating spectacles with variable magnifying power, essentially comprising, in combination, a frame 1, provided with removable illuminating means, particularly by cold light, composed of light conduits 8,9 resiliently engaged in grooves 10,11 provided on the top of the frame and on the inner edges of the frame on either side of the nose, and spectacle lenses each separately provided with a small "zoom" lens 4,5 the illuminating end of said illuminating means being substantially in the axis of vision of the working field. These spectacles are useful in endoscopic micrurgy, various medical fields, in jewelry, electronics, dentistry, and for making precision assemblies and the like.

Abstract: Mirror construction formed of a wedge of plastic having two planar surfaces with a reflecting mirror formed on one of the surfaces and an abrasion resistant coating formed on the other of said surfaces.Method for injection molding a mirror in which the core portion of the mirror is molded from plastic and simultaneously there is laminated thereon on one side a plastic film carrying an abrasion resistant coating and on the opposite side a plastic film carrying a reflective surface so that after curing of the core, the three separate parts can be removed as an integral unit.

Abstract: A display collimator system comprising a cathode-ray tube for displaying electronically generated data and a standby reticle arrangement to be operated in case of failure of the tube. The standby reticle arrangement comprises at least a movable reticle produced statically by means of a plurality of n elements juxtaposed according the intended direction of shift, each element comprising a light source to represent, when supplied, a one and same common shape, and a supply control circuit having n switching positions to supply the n elements separately.

Abstract: An eyeglass construction in which the separate lenses thereof are directly attached to a laterally extending brow bar includes a pair of rearwardly extending threaded posts adapted to pass through spaced openings in the upper peripheral portion of each lens whereby the lenses and brow bar are affixed to each other by nuts engaging said threaded posts, said openings and posts extending substantially perpendicular to the rear plane of each lens. Each of the posts is adapted to extend through a spacing bushing disposed between the opposed lens and brow bar surfaces such that the lenses and the brow bar are spaced away from each other, thus providing clearance between the lens and the brow bar, even at the point of maximum curvature of the lens. The length of the bushings may be modified such that varying lens curvatures may be facilitated and still maintained out of contact with the brow bar.

Abstract: A head-up display optical projector using a Petzval type collimating optical system wherein a secondary image is injected through an optically flat peripheral surface of a lens included in the Petzval lens group closer to the main image display surface of the projector, the lens incorporating an interior flat dichroic film for combining the main and secondary images.

Abstract: In a color separation prism system for a color television camera, a bias light source is located at a position substantially displaced from one or the other of the two intersections of (i) a plane including the optical axis of the taking lens of the camera and perpendicular to the plane including the optical axes of the three color light beams incident to the pick up tubes and (ii) the two parallel edges of a prism block formed by the entrance face thereof to which the light from the taking lens of the camera is incident and the upper and lower parallel faces of the prism block parallel to the plane including the optical axes of the three color light beams. The color separation prism system is particularly suitable for use in a system in which the refractive index of the glass constituting the prism blocks is as high as 1.7.

Abstract: A golfing aid for limiting the horizontal movement of the eyes and/or head of a golfer during the swing. The aid comprises a pair of glasses having two frame mounted lenses, each being opaque except for a full height vertically elongated clear section generally centrally of each lens.

Abstract: An overlay for use on a transmission screen is disclosed which reduces front face glare by providing a plurality of inclined surfaces on the front surface thereof to deflect ambient light away from the viewing area. A coating of opaque material is applied to the peaks of the inclined surfaces to substantially eliminate "echos" of the image being viewed.