Abstract: A scanner system includes a light source for producing a light beam and a multifaceted polygon for scanning the light beam in a scan plane along a scan line a predetermined distance from the polygon, such as at the surface of a photoreceptor or a document to be read. The system also includes a post-facet lens system that includes first and second elements configured to compensate for field curvature and wobble without compensating for scanner non-linearity. Preferably, the first element and second elements are so disposed that the light beam passes first through the first element and then through the second element. In addition, the first element preferably includes first and second surfaces such that the light beam passes from the first surface to the second surface, the first surface being spherical and the second surface being cylindrical with curvature in the scan plane and essential no curvature in the cross-scan plane.

Abstract: In an optical scanner, a light beam emitted from a semiconductor laser is changed to a parallel light beam by a collimator lens and the parallel light beam is formed by a first optical system as a linear image extending in a main scan-corresponding direction. The image-formed parallel light beam is deflected at an equal angular velocity by a rotary polygon mirror having a deflection reflecting face in the vicinity of the linear image. The deflected light beam is formed as a light spot on a scanned face by a second optical system to perform an optical scanning operation. An f.theta. lens in the optical scanner is used as the second optical system. The f.theta. lens has an f.theta. function in the main scan-corresponding direction and a function for setting the scanned face and a deflecting start point on the deflection reflecting face in an approximately conjugate relation in geometrical optics in a cross scan-corresponding direction. The f.theta.

Abstract: A thin plastic sheet having a reflective material on one surface. Sandwiching the reflective layer is an environmental protective coating of plastic resin. In the preferred embodiment, this protective coating also functions as an adhesive for face bonding the film to a mirror frame. In an alternate embodiment, the protective coating is positioned at the reflective surface and an additional adhesive is preferred. This film construction provides a first surface mirror without the disadvantages of prior mirrors. A method of making a mirror is also disclosed.

Abstract: The fundus camera of this invention for taking photographs by fluorescence comprises an exciter filter 7 in an illuminating optical system 1, and a barrier filter 16 in a photographic optical system 2. A member 11 for eliminating harmful reflected light from an objective lens 13 is also provided in the illuminating optical system 1. This member 11 for eliminating harmful reflected light comprises dark spots 21, 22, which transmit light below a lower wavelength limit, and cut out light above the lower wavelength limit, of the barrier filter 16.

Abstract: A light system comprising a light source adapted to illuminate an area and at least two refracting substantially transparent and coextensive films juxtaposed with one another and interposed between the source and the area, the films having mutually confronting patterns of refracting rises formed on respective surfaces of the films, the rises being separated by intervening recesses and the rises and recesses being so oriented as to form diversely distributed light-refraction paths across the films, the patterns being selected so that gaps are provided between the films and to effect diffusion of light from the source cast upon the area.

Abstract: The optical filter device comprises a stack of thin layers exhibiting a sequences h and g which defines a fractal organization. This device makes it possible to obtain spectrum lines which are extremely fine and very well resolved.

Abstract: A line-code reader having a deflection instrument with a laser, from which light in a laser-sweep pattern from an electrically controllable reflecting device is transmitted towards a rotating mirror, and via additional stationary mirrors the light is thrown down towards a product with a line-code label which is to be read. The light reflected from the line-code label is scanned by means of a photocell. The controllable reflecting device in the deflection instrument is supplied with electrical signals or voltages of a frequency or modulated with a frequency of or in the vicinity of the resonant frequency or harmonics hereof for the mechanical oscillation system of which the mirror forms a part.

Abstract: An optical interconnect network has four stages (S.sub.4 to S.sub.7) each formed from two-dimensional perfect shuffle interconnect stage (6) and a two-dimensional array of processing modules (8) each of which has a two-dimensional array of inputs and outputs. The use of two-dimensional modules provides an increase in optical channels which can be processed compared to the equivalent one-dimensional modules. The modules can perform switching functions.

Abstract: A zoom lens barrel has first and second groups of lenses supported by respective lens frames and a cam mechanism which controls the axial position of at least one of the lens groups. The cam mechanism comprises a guide pin which is provided on the lens frame of the associated lens group to be controlled by the cam mechanism, a cam ring which is provided on its one end face with a cam surface with which the guide pin comes into contact, and a cam ring rotating mechanism which rotates the cam ring.

Abstract: A laser beam scanning apparatus having a laser beam generating section generating first and second laser beams, a rotatable polygonal mirror for deflecting the first and second laser beams to form scanning lines each extending in a main scanning direction on a beam receiving surface and an optical system for imaging the first and second laser beams deflected by the polygonal mirror on the beam receiving surface. Each of the first and second laser beams impinges on the reflective face of the polygonal mirror at an angle with respect to an optical axis in a sub-scanning direction perpendicular to the main scanning direction. The following condition is satisfied:.vertline..beta..times.tan.theta.a.vertline..ltoreq.(5/3).times.Pi.vertline..beta..times.tan.theta.b.vertline..ltoreq.(5/3).times.Pi.vertline..theta.a.vertline.+.vertline..theta.b.vertline..gtoreq..vertline. .psi.a.vertline.+.vertline..psi.b.vertline.where .beta. is a magnification of the optical system in the sub-scanning direction, .theta.a and .theta.

Abstract: An optical scanner and beam printer using the optical scanner are disclosed in which the optical scanner includes a scanning element supporting a mirror surface, a support element for freely supporting at one end the scanning element and at another end a vibrating element, and a drive source for inducing vibrations in the vibrating element. The support element may be a shaft having two modes of elastic deformation upon vibration or a torsional spring which undergoes deformation upon vibration. Vibrations received by the vibrating element are applied to the scanning element by the support element to cause optical scanning movement by the scanning element.

Abstract: An anti-reflective coating employing Si.sub.1-x H.sub.x as a high refractive index material in a film pair together with SiO.sub.2 as a low refractive index material is found to be substantially transparent to visible light and to provide good anti-reflectance where the Si.sub.1-x H.sub.x film is ultra-thin, preferably less than about 80 Angstroms, and the thickness of the SiO.sub.2 film is matched to that of the Si.sub.1-x H.sub.x film. Laminated glazing units having such anti-reflective film can be used, for example, even in applications requiring high transmittance of visible light, such as motor vehicle windshields, in view of the substantial transparency of the coating.

Abstract: A real image type finder optical system comprising, in order from the object side, an objective lens, a reticle, a condenser lens and an eyepiece lens. The reticle has a surface of incidence which is located in the vicinity of a plane on which a primary image is to be formed by the objective lens and is configured so as to diffuse a light bundle in different directions by central portion and marginal portion thereof. This finder optical system is capable of forming a sharp image with distortion favorably corrected, has high accuracy for detecting a focused condition and can be composed compactly.

Abstract: Applicant has discovered a method for microembossing reflector surfaces with controlled reflecting patterns too small to be resolved by the unaided eye but capable of providing controlled reflection characteristics superior to uncontrolled random deformation. The result is a microtextured reflector of having dispersion characteristics of enhanced uniformity and a display device which can be read over an enhanced range of viewing angles. Specifically, a reflector in accordance with the invention comprises a base plane and a pattern of microelements having maximum lateral dimensions less than 125 micrometers and smooth, continuous mold-formed surfaces arising from the base plane. Such a reflector surface can be made using a master formed by covering a substrate with photoresist, exposing the resist to define a pattern of microelements having maximum lateral dimensions less than about 125 micrometers and heating the substrate to partially melt the resist elements thereby obtaining smooth-surfaced microelements.

Abstract: Disclosed is an outside rearview mirror for a vehicle which has a mirror base adapted to be mounted to a car body, and a mirror housing mounted to a support plate. The support plate is fastened foldably to the mirror base by a joint. The mirror housing has the form of a frame surrounding a mirror glass which is mounted by an adjustment device to the rearward face of the support plate. A cap is detachably clamped to the front face of the support plate and continues the outer contour of the mirror housing. Thereby the transfer of vibrations from the mirror housing to the mirror glass is cut down to a minimum and shifted to a frequency range which does not influence the perception of the image the mirror glass is presenting to the driver of the car.

Abstract: The present invention is a mount for optical instruments, and particularly, for a Berek compensator having a birefringent crystal, which can be both tiled and rotated by structure of adjustment rings which are concentric to the optical path of the device.

Abstract: A nonimaging radiant energy device may include a hyperbolically shaped reflective element with a radiant energy inlet and a radiant energy outlet. A convex lens is provided at the radiant energy inlet and a concave lens is provided at the radiant energy outlet. Due to the provision of the lenses and the shape of the walls of the reflective element, the radiant energy incident at the radiant energy inlet within a predetermined angle of acceptance is emitted from the radiant energy outlet exclusively within an acute exit angle. In another embodiment, the radiant energy device may include two interconnected hyperbolically shaped reflective elements with a respective convex lens being provided at each aperture of the device.

Abstract: A wide angle objective lens has, in succession from the object side, a first lens component which is a positive meniscus lens having its convex surface facing the object side, a second lens component which is a cemented meniscus lens comprising a negative lens and a positive lens cemented together and having its concave surface facing the object side and having positive refractive power, a third lens component which is a cemented meniscus lens comprising a negative lens and a positive lens cemented together and having its concave surface facing the object side and having positive refractive power, and a fourth lens component which is a negative meniscus lens having its concave surface facing the object side, and has a stop between the second lens component and the third lens component, and satisfies various predetermined conditions.

Abstract: A bicycle signalling assembly comprises a seat body having two cylinders constructed in such a manner that a circuit board can be fastened securely to cylinders without using a hand tool.

Abstract: An electrochromic variable transmission glazing comprising first and second glass sheets substrates which are joined by an organic polymer whose proton conductivity is greater than or equal to 10.sup.-5 ohm.sup.-1 cm.sup.-1 at 20.degree. C. The glass sheets are coated on their joining faces with transparent electroconductive layers. The first transparent substrate further comprises a layer of electrochromic material, such as tungsten oxide, in contact with the proton conductive polymer. The glazing is characterized by an iridium oxide layer on the second transparent substrate which is interposed between the layer of electroconductive material and the organic polymer. The glazing further comprises a pair of current leads attached to the electroconductive layer which connect the glazing to a generator.