Abstract: The distal end of a flange of a stator serving as a contact member is located on the outer peripheral side of one linear portion of an elastic member serving as a vibration member, and the inner peripheral side of this linear portion of the elastic member is located on the proximal side of the flange. The ratio of the response amplitude of the flange of the stator to the amplitude of the elastic member is kept almost constant in all areas of contact portions between the two members.

Abstract: A lens meter is provided which comprises a light source for generation of a measuring light beam and a pattern forming plate provided in an optical path of the measuring light beam. The pattern forming plate has a central pattern for measuring lens characteristics of a narrow area on an eyeglass lens and a plurality of peripheral patterns for measuring lens characteristics of a wide area on the eyeglass lens. The pattern forming plate can be switched between a normal measuring mode which receives the image of the central pattern based on the measuring light beam transmitted through the narrow area of the eyeglass lens and also measures the narrow area alone and displays the measured values and a wide-area measuring mode which receives a great number of images of the peripheral patterns based on the measuring light beam transmitted through the wide area of the eyeglass lens and also measures the wide area and performs mapping display.

Abstract: A lens meter is provided which includes a light source portion (20) with a first light source (21) for generating a lens-characteristic measuring light beam (P2) and a second light source (23) for generating a position specifying light beam (P1). A patterning plate (28) with lens-characteristic measuring patterns (28c) and position specifying patterns (28b) is disposed in an optical path (31) of the lens-characteristic measuring light beam (P2) and position specifying light beam (P1) generated by the light source portion (20). The measuring light beam (P2) is projected onto a subject lens (30) set in the optical path (31) so that the images (28c') of the lens-characteristic measuring pattern (28c) are received. The received images (28c') are analyzed, and the lens-characteristic mapping display of the subject lens (30) is performed. In this lens meter, the first and second light sources (21, 23) are separate from each other.

Abstract: A progressive power lens (L) is illuminated with a collimated light beam through an illuminating optical system (2) comprising an LED (5), a pinhole plate (6), and a collimator lens (7). The shadow of the hidden mark of the progressive power lens (L) is projected onto a screen (4) by the light beam transmitted through the progressive power lens (L).

Abstract: A lens meter is provided which includes a light source portion (1) which emits measuring light (P) having at least three different wavelengths; a light receiving portion (3) which receives the measuring light (P) which has passed through a to-be-inspected lens immersed in a liquid (12) as a medium; an in-medium optical characteristic measuring device for measuring an optical characteristic of the lens (13) in the medium about each wavelength, based on a deviated quantity of the measuring light detected by the light receiving portion (3); a refractive index calculating device for calculating a refractive index of material of the lens (13), based on a difference of the optical characteristic of the lens in the medium among the wavelengths; and a converting device for converting the optical characteristic of the lens (13) in the medium into an optical characteristic of the lens (13) in the air, based on the refractive index calculated by the refractive index calculating device.

Abstract: In a backlighting device for use with display panels that comprises a light conducting plate made of a light-transmissive material, one of the major faces of said light conducting plate being provided with a light diffusing capability and covered with a specular or light diffusing/reflecting plate, and a linear light source provided in proximity to the end portion of at least one side of said light conducting plate, the improvement wherein at least one sheet that is made of a light-transmissive material and that has a multiple of raised structures having straight ridgelines at minute intervals on the same side in such a manner that the ridgelines are substantially parallel to one another or at least one sheet that is made of a light-transmissive material and that has a multiple of pyramidal or conical projecting structures at minute intervals on the same side, said projecting structures having portions of such a shape that the vertical angles are substantially the same, is provided on the exit face of the lig

Abstract: A lens meter in which light from a measurement light source is passed though a lens to be measured into a photoelectric conversion element so as to find optical characteristics of the lens to be measured based on photoelectric conversion signals from the photoelectric conversion element. The measurement light source is capable of emitting at least two rays of light having different wavelengths. The lens meter includes computing device for calculating optical characteristics of the lens to be measured based on photoelectric conversion signals from the photoelectric conversion element in response to the two rays of light having different wavelengths. This configuration ensures an accurate measurement of optical characteristics of the lens to be measured whole optical characteristics are unknown.

Abstract: In a backlighting device for use with display panels that comprises a light conducting plate made of a light-transmissive material, one of the major faces of said light conducting plate being provided with a light diffusing capability and covered with a specular or light diffusing/reflecting plate, and a linear light source provided in proximity to the end portion of at least one side of said light conducting plate, the improvement wherein at least one sheet that is made of a light-transmissive material and that has a multiple of raised structures having straight ridgelines at minute intervals on the same side in such a manner that the ridgelines are substantially parallel to one another or at least one sheet that is made of a light-transmissive material and that has a multiple of pyramidal or conical projecting structures at minute intervals on the same side, said projecting structures having portions of such a shape that the vertical angles are substantially the same, is provided on the exit face of the lig

Abstract: Disclosed is feeding apparatus comprising a first vibration apparatus having projections provided with a predetermined distance therebetween, the first vibration apparatus producing a first travelling vibration wave in response to an electrical signal applied thereto, and a second vibration apparatus having projections located at the positions substantially corresponding to the projections of the first vibration apparatus, the second vibration apparatus producing a second travelling vibration wave proceeding in the same direction as the first travelling vibration wave in response to an electrical signal supplied thereto thereby the sheet inserted between the projections of the first vibration apparatus and the projections of the second vibration apparatus being fed by the first and second travelling vibration waves.

Abstract: An improved backlighting device for liquid-crystal display panels comprising a linear light source the length of which is equal to or less than the length of an end portion of a light conducting plate at which light is admitted from the linear light source placed adjacent to it, the linear light source being enclosed with a light diffusing reflector that has a slit formed in the surface through which incident light is admitted into the light conducting plate and which is provided in such a way as to form a clearance from the surface of the linear light source, one major surface of the light conducting plate being partially covered with a light diffusing material under specified conditions that has a higher refractive index than the material of which the light conducting plate is made, the major surface being further covered with a specular or light diffusing/reflecting plate, with a plurality of light diffusing plates being provided on the other major (light emerging) surface of the light conducting plate.

Abstract: There is disclosed a sheet feeding device having at least two vibration members pinching a sheet, which is frictionally driven by the travelling vibration waves generated in the vibration members. The device is further provided with a detector for detecting the state of vibration of the vibration members and generating a signal corresponding to the phase difference between the vibrations. The signal is used for correcting the vibration state of the vibrations members, thus significantly reducing the unevenness in the sheet feeding.

Abstract: A back lighting device for a liquid crystal display has a light scattering coating in the form of dots covering the light emitting surface of a photo-conductive plate. The coating covers 3-50% of the surface nearest an end thereof adjacent a linear light source and covers 80-100% of the surface farthest from the light source. The variation of the coating rate across the surface produces uniform distribution of emitted light from the back lighting device.