Abstract: In a means for holding a stamper plate in a molding metal die so that the stamper plate can be easily mounted on and dismounted from the surface of a disc cavity plate, the means comprises the stamper plate having a hole at the center thereof and composed of a ferromagnetic substance, a stamper plate bush having an engaging shaft portion to be engaged with the center hole of the stamper plate in a molding cavity and disposed at the center of the disc cavity plate on the side where the stamper plate is mounted, a magnetic flux generating means disposed in a ring shape around the outer periphery of the engaging shaft portion of the stamper plate bush in the disc cavity plate for generating magnetic flux in a direction vertical to the surface of the stamper plate coupled with the engaging shaft portion, a vacuum hole defined to the disc cavity plate in correspondence to the portion of the stamper plate where no information is recorded for vacuuming the rear surface of the stamper plate, and an air passage define

Abstract: A polishing disc of spherical polishing device for polishing optical end surface capable of minimizing optical loss due to reflection in a returning direction. With this polishing disc of polishing device for polishing a spherical surface on optical fiber end surface, a tip end of a ferrule supporting an optical fiber is pressed against a surface of the polishing disc and a relative movement for polishing is caused between the ferrule tip end and the polishing disc surface to polish a tip end of the optical fiber into a spherical surface. The polishing disc A is constituted by a flat plate made of an elastic material and a soft plastic film which is provided on said flat plate as a film surface without containing abrasive and which has rugged patterns having a surface roughness of several microns or less. The surface of the soft plastic film is preferably a rough surface having rugged patterns of a surface roughness of 2 .mu.m or less.

Abstract: An optical fiber interface for coupling input light power from a light source to an optical fiber. The optical fiber has an optical axis, an incident end face extending transverse to the optical axis, a core region having a predetermined diameter, and a clad region surrounding the core region. The end face comprises a first surface portion having the shape of an element of a sphere. The sphere has a center on the optical axis and a diameter not greater than the diameter of the core region. The first surface portion of the end face is symmetrical with respect to the optical axis and extends from the optical axis along the core region toward the clad region. The end face also comprises a second surface portion having the shape of an element of a cone extending from the first surface portion of the end face along the clad region, the second surface portion being tangential to the first surface portion of the end face.

Abstract: A light coupling device for coupling a light source to an optical fiber. The device includes a first cylindrical sleeve carrying a GRIN lens and a ferrule. The ferrule receives the optical fiber. Movability of the ferrule along the optical axis of a first through-hole in the first sleeve allows a determination of a focal length between the GRIN lens and an incident end face of the optical fiber. A first setting means sets a relative position of the ferrule with respect to the first sleeve for holding the two in position with respect to one another when the GRIN lens and the incident end face of the optical fiber are separated by a distance equal to the focal length therebetween. The device further includes a second cylindrical sleeve. The first sleeve is coaxially disposed within a second through-hole of the second sleeve, and a light source unit is concentrically disposed within the second through-hole.

Abstract: An optical fiber end-surface polishing device has an improved ferrule fixing device allowing ferrules with optical fibers to be attached to or detached from a holder plate for polishing by a simple operation. The optical fiber end-surface polishing device, having a ferrule fixing device, simultaneously polishes the end surfaces of a plurality of ferrules with optical fibers fixed to and supported by a holder plate. The device includes ferrule accommodating sockets provided on the holder plate and having through holes for accommodating ferrules; and ferrule presser levers supported by stationary shafts substantially parallel to the through holes and biased toward descent by biasing devices, wherein each of the ferrule presser levers is movable between an angular position where the ferrules inserted into the associated ferrule accommodating sockets are downwardly pressed and an angular position where the polished ferrules can be detached.

Abstract: An optical fiber light coupling interface effective for feeding and propagating light power dispersed from a light source, and a method of forming the interface. The interface includes an optical fiber having an optical axis, a core, and a clad surrounding the core, the core and the clad having respective radii. The optical fiber further includes an enlarged input end face where the respective radii of the core and the clad assume respective first values, the respective radii of the core and the clad decreasing in a direction away from the input end face along the optical fiber to respective second values at a first transitional region of the optical fiber, the respective second values being less than the respective first values. The input end face is formed by applying a compressive stress to the optical fiber for enlarging the respective radii of the core and the clad at a part of the optical fiber while fusing that part by heating.

Abstract: To produce base boards each usable for an information recording medium such as a photoelectromagnetic disc or the like by employing an injection molding process, an injection molding die of the type comprising a die half on the stationary side and a die half on the movable side includes a cylindrical supporting member on the stationary side, a die assembly on the stationary side arranged in the cylindrical supporting member, a cylindrical supporting member on the movable side, a die assembly on the movable side arranged in the cylindrical supporting member, a cylindrical guide member located between both the cylindrical members, a first driving unit for displacing the die half on the movable side, and a second driving unit for actuating an ejector sleeve.

Abstract: To injection-mold a base board for an optical disc or the like, an injection molding die includes a stamper plate attaching/detaching device installed therein. The stamper attaching/detaching device includes as essential components a stamper plate attaching/detaching bush adapted to be fitted into a tapered bush fitting hole formed in a die half on the movable side together with a stamper plate to be firmly placed on a die cavity, an actuating rod having a pinion gear formed at the fore end part thereof to mesh with a rack formed at the lower end part of the stamper plate attaching/detaching bush, and a lock nut for immovably hold the actuating rod during a series of molding operations. The stamper plate is removably fitted around the outer periphery of a flange portion of the stamper plate attaching/detaching bush.

Abstract: An optical demultiplexing/multiplexing device made with a few stable components by easy fabrication processes, which provides a flat response over the specified frequency range.

Abstract: An injection molding die for simultaneously molding a plurality of optical disc base boards. The die has a stationary die assembly portion that includes a first base plate having a first center axis, and a plurality of first cavities each having a respective center axis. The first cavities are arranged in an equally spaced relationship along a circumference of a circle coaxial with the first center axis. The die also has a movable die assembly portion that includes a second base plate having a second center axis, and a plurality of second cavities each having a respective center axis. Each second cavity positionally corresponds to a respective first cavity. The first center axis is aligned with the second center axis using a guide rod fixedly secured to the first base plate and that extends along the first center axis, and by using a guide member that extends along the second center axis to be positionally coincident with the first center axis.

Abstract: A pedestal 11 is attached to a circuit substrate 1 having a component placement area 4 when clamping portions 12 and 12 of the pedestal 11 clamp both side portions 5 and 5 of the component placement area 4. It is possible to stand the hybrid integrated circuit device on a parent circuit substrate a by itself before the hybrid integrated circuit device is soldered to the parent circuit substrate a. Since the bottom surfaces of the clamping portions 12 and 12 are flat. The circuit substrates 1, 1, . . . do not overlap one another when the hybrid integrated circuit devices are accommodated in and arranged vertically in a stick since the thickness of the clamping portions 12 and 12 of the pedestal 11 is thicker than the circuit substrate 1. Accordingly, the hybrid integrated circuit device is liable to vertically stand on the parent circuit substrate a by itself and it is easily accommodated in and taken out from the stick.

Abstract: An apparatus for grinding end surfaces of ferrules together with optical fibers each firmly received therein includes as essential components a platform serving as a base for the apparatus, a grinding board assembly rotationally driven such that a grinding board is displaced along a horizontal reference plane as it is rotated, a ferrule holder for holding the ferrules each of whose foremost end to be ground is oriented toward the grinding board, a ferrule holder supporting member for bringing the ferrule holder to a surface position to be assumed by the ferrule holder on completion of a grinding operation while supporting the ferrule holder, and a thrusting unit for normally thrusting the ferrule holder toward the grinding board. It is desirable that the center of the grinding board assembly be positionally offset from the center of the ferrule holder supporting member.

Abstract: To connect one ribbon-shaped optical fiber cord to an opponent ribbon-shaped optical fiber cord while making reliable optical connection therebetween, an optical fiber splicer is used. The optical fiber splicer includes as essential components an aligning member and a cover member, and the cover member is fitted into the aligning member to build an integral structure without an optical fiber using an adhesive. In practical use, after the adhesive is hardened, both the ribbon-shaped optical fiber cords are inserted into the integral structure from both sides of the optical fiber splicer so that sheathless optical fibers of both ribbon-shaped optical fiber cords are firmly received in V-shaped aligning grooves on the aligning member in a face to-face relationship.

Abstract: An optical attenuator comprising an optical fiber and at least a light attenuating portion disposed on the optical fiber. The light attenuating portion is formed such that a part of the optical fiber is heated by an opposing pair of discharge electrodes or gas burners and then compressed in the axial direction to provide a spherically contoured light attenuating portion or pulled in the axial direction to provide a light attenuating portion having a reduced diameter. In addition, a method and an apparatus for producing an optical fiber of the foregoing type are disclosed. The method is practiced by way of the steps of heating a part of an optical fiber and then physically deforming the heated part to serve as a light attenuating portion by compressing or pulling it in the axial direction.

Abstract: A moving course data collection system for use in a large-scale store such as a supermarket or the like in which a portable scanner is provided to customers which allows customers to input article code data for articles in the store customers wish to purchase. The display location of all articles in the store is stored. Thus, every time a customer inputs article code data, the time and an approximation of the customer's position in the store is determined from the article code data input by the customer and the display location of that article in the store. This information is sequentially recorded, thereby collecting data on the customer's moving course through the store.

Abstract: Two types of structural elements each employable for a light diverging/converging device are disclosed. One is a double circuit diverging ferrule which comprises a first semicylindrical ferrule element, a second semicylindrical ferrule element and a cylindrical bushing through which both the ferrule elements are press-fitted. The other is a single circuit converging ferrule which comprises a first semicylindrical ferrule element, a second solid semicylindrical ferrule and a cylindrical bushing through which both the ferrule elements are press-fitted. Three types of light diverging/converging devices, i.e., a diverging ratio variable type 1.times.2 circuit light diverging/converging device, a diverging ratio variable type 2.times.2 circuit light diverging/converging device and a 1.times.2 circuit light diverging/converging device having a constant diverging ratio each of which is constructed by using the aforementioned structural elements are also disclosed. A 2.times.

Abstract: A printing apparatus for printing an identification display such as schema numerals, symbols or the like for a wire material on the outer peripheral surface of the wire materials such as an electric wire cord is disclosed. The printing apparatus for the wire material is provided with a selection and drive unit for feeding, respectively, plural kinds of wire materials and selecting a wire material corresponding to a wire material to be printed and with a movable printing unit to be moved to a position corresponding to the wire material fed from the selection and drive unit to perform the printing operation.

Abstract: A light attenuating element comprising a ferrule and two optical fibers inserted through the ferrule along an optical axis thereof is disclosed. The inner ends of both the optical fibers are cut with a predetermined inclination angle and spaced from each other with a predetermined distance therebetween to obtain a required light attenuation value. A light attenuating element including an alignment sleeve into which two ferrules each having an optical fiber inserted therethrough are fitted with a predetermined distance being maintained between the foremost ends thereof is also disclosed.

Abstract: A method of grinding ferrules for ribbon type optical fibers wherein the method comprises the steps of locating the end surfaces of the ferrules with respect to a grinding surface of a grinding member, reciprocatingly turnably displacing the ferrules along an arched locus, and grinding the end surfaces of the ferrules with the grinding wheel. To practice the method, an apparatus including a ferrule holding member, a supporting member having the ferrule holding member turnably supported thereon, a driving unit in form of an electric motor including a reduction gear, a connecting rod bridged between the driving unit and the ferrule holding member to reciprocably turn the ferrule holding member, a grinding member mounted on a frame of the apparatus, a grinding position adjusting unit, a compression spring for normally biasing the supporting member in the upward direction, and a base board mounted on the frame of the apparatus for turning the supporting member about an intermediate position thereof.

Abstract: On an optical connector plug main body 3 whose transverse section is a trapezoid, a groove 6 of rectangular transverse section is provided, at a bottom of which a plurality of alignment V grooves 7 are formed. In a plate member 9 of rectangular transverse section has a receiving groove 10 of also rectangular transverse section, the groove 10 being connected with the bottom of the plate member 9. An alignment sleeve 12 has an alignment groove 14 of wedge head shape. The plate member 9 is engaged with the groove 6 of the connector plug main body 3, and protrusions 11 of the plate member 9 is ultrasonic bonded into recesses 8 provided in the connector plug main body 3. A ribbon type optical fiber to which an adhesive is applied is inserted from the groove 6 to complete the connector plug. Thus assembled connector plugs are inserted in the state whose ends are faced with each other into the groove 14 of the alignment sleeve 12 to make the connection of the ribbon type optical fiber.