Abstract: In a bonded optical disk comprising two base disks which are bonded together by UV-setting adhesive, one or two of the base disks are provided with a projection located inside the adhesive application starting position in order to maintain the distance between bonded surfaces of the base disks at a predetermined thickness for the adhesive layer. A mold for molding above base disks is also provided. The thickness of the UV-setting adhesive is easily held at a predetermined thickness by the projection located inside the starting position. Therefore steady mass production of bonded optical disks with uniform adhesive layer thickness is made possible with easier management of the adhesive layer thickness.

Abstract: In a bonded optical disk comprising two base disks which are bonded together by UV-setting adhesive, one or two of the base disks are provided with a projection located inside the adhesive application starting position in order to maintain the distance between bonded surfaces of the base disks at a predetermined thickness for the adhesive layer. A mold for molding above base disks is also provided. The thickness of the UV-setting adhesive is easily held at a predetermined thickness by the projection located inside the starting position. Therefore steady mass production of bonded optical disks with uniform adhesive layer thickness is made possible with easier management of the adhesive layer thickness.

Abstract: Indication members provided around a central hole in a disk does not adversely affect reference surfaces to be clamped, and clear, stable indication is maintained. For this purpose, first and second optical disks having annular light transmissive disk substrates with a common central hole, one surface of each of which light transmissive disk substrates is provided with a reflection film, are attached to each other as one body with an adhesive layer interposed therebetween, such that the reflection films opposed each other, thereby forming a compound optical disk. Label members are provided from the reflection film side by printing or attachment on flat portions surrounding the central hole.

Abstract: In an optical disk, a display area is formed between the circumference of a recorded area and the circumference of the maximum area to which a recorded area can be provided. A reflective layer is formed covering the recorded area 3 and covering the display area forming a transparent display area at least in part of the display area. And to the transparent display area, a print layer is provided. According to this composition, there is provided the transparent display area without the reflective layer in the optical disk with a recorded area of a small diameter. Therefore, discrimination of the size or diameter of a record area of 12 cm CDs is made easier, and the print layer provided to the transparent display area can be seen from both sides of the optical disk.

Abstract: The method and apparatus of making a bonded disk according to this invention is intended to produce bonded disks in a large number at low cost, wherein a bonding strength is not reduced when the inner bonding surface is recessed for title display, it is not deformed easily when stored or left at a high temperature for a long period of time, at least one disk of the paired one-sided disks is formed with a recess for title display where is connected to the stamper clamp groove, a title consisting of desired letters and patterns is printed with an ink on the recess of the one-sided disk, the bonding surface of at least one disk of the paired one-sided disks is applied with a thermoplastic bonding agent while a liquid type reaction setting bonding agent is applied to the recess and the stamper clamp groove of the one-sided disk, and the paired one-sided disks are stacked to bring their bonding surfaces in contact with each other and press them together to form a single bonded disk.

Abstract: A composite optical disk structure includes a first transparent disk plate having a first center hole, a first stamper clamp groove and a first information recording area on its one main surface; a second transparent disk plate having a second center hole having a diameter equal to that of the first center hole, a second stamper clamp groove and a second information recording area on its one main surface; a transparent adhesive sandwiched between the first and second transparent disk plates to bond the one main surfaces of them; and a mechanism formed between the one main surfaces for preventing the transparent adhesive from leaking our into the center holes.

Abstract: The method and apparatus of making a bonded disk according to this invention is intended to produce bonded disks in a large number at low cost, wherein a bonding strength is not reduced when the inner bonding surface is recessed for title display, it is not deformed easily when stored or left at a high temperature for a long period of time, at least one disk of the paired one-sided disks is formed with a recess for title display where is connected to the stamper clamp groove, a title consisting of desired letters and patterns is printed with an ink on the recess of the one-sided disk, the bonding surface of at least one disk of the paired one-sided disks is applied with a thermoplastic bonding agent while a liquid type reaction setting bonding agent is applied to the recess and the stamper clamp groove of the one-sided disk, and the paired one-sided disks are stacked to bring their bonding surfaces in contact with each other and press them together to form a single bonded disk.

Abstract: A disk case has a pocket-shaped case body for accommodating a disk. Tongue pieces are provided at one edge of the case body, at the centers of opposite halves of the periphery of a disk insertion inlet thereat. These tongue pieces are formed so that one end of each is aligned with a corresponding end of the other at a first position of the end of the disk insertion inlet, and overlap or cross each other on the outside of the periphery. The respective other ends of the tongue pieces coincide with a pair of opposite edges of the case body. Perforations are provided along the boundary between each of the tongue pieces and the case body. The tongue pieces can be torn at these perforations to be separated from the case body. The disk case thus formed has a simple structure, can be easily sealed and appended to a book, and prevents a disk from moving in the case after being placed therein.

Abstract: A manufacturing method for an ink jet printer head, includes the steps of: cutting a plurality of channels for forming a plurality of ink chambers, on the upper surface of a substrate composed of a plurality of layers including at least one piezoelectric member polarized across its thickness; forming a pattern resist film covering a portion of the upper surface of the substrate except electrode forming portions on the inner surfaces of the channels and wiring pattern forming portions on the substrate; performing a process for adsorption of Pd on the electrode forming portions and the wiring pattern forming portions after forming the pattern resist film, for example, by performing a sensitizing process of adsorbing Sn on the substrate and next substituting Pd for the Sn, or by performing a catalyzing process of adsorbing a complex compound of Pd on the substrate and next performing an accelerating process of metallizing the complex compound of Pd; separating the pattern resist film; immersing the substrate fro

Abstract: A manufacturing method for an ink jet printer head, includes the steps of cutting a plurality of channels for forming a plurality of ink chambers, on the upper surface of a substrate including at least one piezoelectric member polarized across its thickness; adsorbing Sn on the upper surface of the substrate including the inner surfaces of the channels; forming a pattern resist film on the upper surface of the substrate on which the Sn has been absorbed adsorbing Pd as a catalyst core for electroless plating on the electrode forming portions and the wiring pattern forming portions; separating the pattern resist film; immersing the substrate from which the pattern resist film has been separated into a plating liquid to deposit plating on the electrode forming portions and the wiring pattern forming portions; and mounting on the substrate a top plate for covering upper openings of the channels and a nozzle plate for covering front openings of the channels to form the above ink chambers.

Abstract: A method of producing a printer head wherein a substrate including at least one piezoelectric member polarized in its thickness direction is formed. A plurality of grooves and a plurality of posts are alternately defined in the substrate. A pre-processing solution is allowed to flow along the grooves at the following relative velocity so as to effect pre-processing when the velocity of the pre-processing solution for electroless plating relative to an object to be plated is V, the height of each of electrodes formed on the internal surfaces of the grooves is H, the width of each groove is W and a contact angle at which the pre-processing solution is brought into contact with the internal surfaces of the grooves is .theta..VW.sup.2 (1+cos.theta. )/H.sup.2 >0.6 mm/sThereafter, the substrate is immersed in an electroless plating solution to form the electrodes.

Abstract: In a radiographic apparatus, a source of radiation is arranged to scan a planar spread of radiation in a plane about the body of a patient being examined. A plurality of detector devices is arranged to provide data representing the absorption of the radiation along a plurality of paths within the spread, for different orientations in the plane, for processing to determine a distribution of absorption coefficients for a planar slice of the body. The arrangement is such that a predetermined number of the detector devices are irradiated by the spread of radiation at any time and the actual devices irradiated change progressively as the scan progresses.

Abstract: A method of making a humidity sensor comprises providing a host device constituted by a semi-conductor substrate (10) and a gate insulator (13) of an insulated gate field effect transistor, forming a layer (14) of poly (vinyl) alcohol (PVA) on the exposed surface of the insulator, heat treating the layer to crystallize and stabilize the PVA, and forming a gate electrode (15) on the PVA layer, so that the gate electrode is porous allowing ambient water vapor to be absorbed by the PVA which, in response, undergoes a change of bulk dielectric constant, thereby causing a change in gate capacitance of the transistor resulting in a detectable change of electrical conductivity in the drain source channel.

Abstract: A circuit (FIG. 1) for generating a current impulse comprises an avalanche transistor 2 which responds to a stimulus to apply an electrical impulse to the bases of a plurality of further avalanche transistors 3, 6. The further transistors respond to the impulse to discharge respective equal capacitors 9-12 through a laser diode 7. Further equal capacitors 22-25 connect the emitters of the transistors to the common junction of the transistor 2 and an impedance 21 to generate the electrical impulse when the transistor 2 responds to the stimulus. The arrangement of the further capacitors ensures that once one further transistor begins to conduct, the electrical stress on the others is increased, thus ensuring the further transistors simultaneously avalanche.

Abstract: A signal generator produces a spread-spectrum bandwidth signal in the frequency range 40 to 90 KHz for use in a domestic mains signalling system. In the generator, sixteen individual frequencies, equi-spaced in that range, pass to samplers operating at a clock frequency of 204.8 KHz and then to quantisers before storage. The resulting signals are then assembled in appropriate manner by selector switch before being filtered when (temporarily) in the frequency domain.The resultant signals duly reach catalogue store, whose output can be used for programming an EPROM in a mains signalling interface unit.

Abstract: A communication system utilizing the electrical-supply wiring of mains circuit has an interface unit for an intruder-sensor. Unit has a transmitter for sending FSK-modulated messages and a capacitor to store adequate energy to power transmitter only for the time-duration of a message. The system also has a interface unit for a temperature sensor.

Abstract: The signalling network has a main control unit which can communicate with any of a number of home units each associated with a separate household. Some home units have signal-repeater facilities. Each of the control units and the home units has an address identity unique in the network.When a signal is sent out targeted at a specific home unit, the main control unit monitors for acknowledgement of reaching its destination. If no such acknowledgement is received, the main control unit sends out the signal again, but re-routed via an intermediate home unit with a repeater facility.

Abstract: A signal generator produces a spread-spectrum bandwidth signal in the frequency range 40 to 90 KHz for use in a domestic mains signalling system. In the generator, sixteen individual frequencies, equi-spaced in that range, pass to samplers operating at a clock frequency of 204.8 KHz and then to quantizers before storage. The resultant signals are then assembled in appropriate manner by selector switch before being filtered when (temporarily) in the frequency domain.The resultant signals duly reach catalogue store, whose output can be used for programming an EPROM in a mains signalling interface unit.

Abstract: The IFF system uses basic identification codes which are transmitted between an interrogator and a responder. The basic codes are chosen in dependence upon the time and position of the interrogator or responder at the time of choice. In one version of the system, the lifetime of a code is less than or equal to the propagation time of a radio signal for a given maximum range between the interrogator or responder. Interactive interrogation may also take place using codes chosen in the same way as the basic codes. Local information may also be transmitted between the interrogator and transponder. An example of apparatus for performing these operations transmits basic or other codes together with a time code defining the time of production of the basic or other codes. It is not essential to transmit a time code in some circumstances. Position and time information may be gained from an external communications system.

Abstract: In a computer-assisted tomography (CAT) apparatus, in which a fan-shaped X-ray distribution is rotated about the patients body, it is possible to use a ring of stationary detectors disposed to receive the radiation after passage through the body. In this arrangement the ring of detectors is of smaller radius than the locus of motion of the radiation source. It would appear that this would cause the detectors to obscure the body from the radiation. An arrangement disclosed moves out of the radiation beam those detectors which would present an obstruction so that only those required to collect radiation lie in the beam.