Abstract: A method of treating a disc plate. has the following operations of: molding a mold disc plate through an injection molding; and spinning the mold disc plate at a high spin speed. The spinning operation has at least one of the following two sub-operations of: reducing a warp of the mold disc plate with a centrifugal force caused during the spinning operation, and reducing a temperature of the mold disc plate during the spinning operation. Moreover, an apparatus of treating a disc plate has: a conveyer for conveying a mold disc plate obtained through an injection molding; a disc bench for receiving the mold disc plate conveyed with the conveyer; and a spin driver for spinning the disc bench when a temperature of the mold disc plate is higher than 90° C., to thereby spin the mold disc plate.

Abstract: An energy accumulating capacitor such as an excimer laser is prevented from being overcharged by stored energy in a resonance inductance device. In a resonant capacitor charging circuit, when it is forecast that an energy accumulating capacitor can be charged to a target charge voltage by the magnetic energy of a resonant inductance device after a first semiconductor switch is switched off, the first semiconductor switch is switched off, and when actually reaching the target charge voltage, a second semiconductor switch is switched on or off, in order to charge with high accuracy.

Abstract: A capacitor charger is provided that can control charging voltage with high accuracy, and repeat a process of increasing it to a target charging voltage at high speed. In a first step, an ac voltage is generated in a resonant type inverter section by fixed frequency driving pulses, the ac voltage is converted to a dc voltage, a load capacitor is charged by the dc voltage, a calculation pulse in the driving pulse has a predetermined, fixed driving pulse width, and the load capacitor is charged by &Dgr;Vn each pulse. In a second step, when the charging voltage V1 of the load capacitor and the target voltage V2 satisfy an inequality relationship “V2>V1>V2−&Dgr;Vn”, charging is performed by a single or a plurality of final pulses having a driving pulse width W2 (W1>W2) as required to step up the voltage by “V2−V1”.

Abstract: A heat roller for a fixing device included in an image forming apparatus has an insulation layer and a conductive layer sequentially formed on the inner periphery thereof. To form each of the insulation layer and conductive layer, a spray gun is inserted into the heat roller. Subsequently, paint, which is a liquid for forming the insulation layer or the conductive layer, is fed under pressure to the spray gun. The paint is radially jetted via the holes of the spray gun and evenly deposits on the inner surface of the heat roller. In this condition, the spray gun is moved in a preselected direction in order to coat the entire inner periphery of the heat roller. After the insulation layer has been formed and then sintered, the conductive layer is formed on the insulation layer and then sintered. The two layers can be formed in a short period of time and provides the heat roller with high quality at low cost. A method of producing the heat roller is also disclosed.

Abstract: A molded disc substrate obtained by injection molding is rotated at high speed before the molded disc substrate has solidified, and a gas is also made to flow in an outward radial direction along a bottom surface of the molded disc substrate while the molded disc substrate is rotating, and the rotation is stopped after the molded disc substrate has solidified. Thus, a disc substrate with little warping is obtained in a short time.

Abstract: An energy accumulating capacitor such as an excimer laser is prevented from being overcharged by stored energy in a resonance inductance device. In a resonant capacitor charging circuit, when it is forecast that an energy accumulating capacitor can be charged to a target charge voltage by the magnetic energy of a resonant inductance device after a first semiconductor switch is switched off, the first semiconductor switch is switched off, and when actually reaching the target charge voltage, a second semiconductor switch is switched on or off, in order to charge with high accuracy.

Abstract: A method and apparatus for manufacturing an optical disc, a transparent disc substrate having two relatively wide-area surfaces thereof on at least one of which an information is recorded and a first reflective film is formed onto a dummy disc having similar relatively wide-area surfaces thereof on at least one which another information is recorded and a second reflective film having a light semi-transmissive characteristic is formed are bonded via an adhesive layer and, thereafter, an external force is applied between the dummy disc and the disc substrate through an integrated center hole penetrated through the dummy disc and the disc substrate at center positions thereof to peel off the dummy disc at a first interface between the dummy disc and the second reflective film thereof In a preferred embodiment, a partial peeling off of the dummy disc from the second reflective film is carried out through a mechanical force and a complete peeling off of the dummy disc from the second reflective film is carried out

Abstract: A method of treating a disc plate. has the following operations of: molding a mold disc plate through an injection molding; and spinning the mold disc plate at a high spin speed. The spinning operation has at least one of the following two sub-operations of: reducing a warp of the mold disc plate with a centrifugal force caused during the spinning operation, and reducing a temperature of the mold disc plate during the spinning operation. Moreover, an apparatus of treating a disc plate has: a conveyer for conveying a mold disc plate obtained through an injection molding; a disc bench for receiving the mold disc plate conveyed with the conveyer; and a spin driver for spinning the disc bench when a temperature of the mold disc plate is higher than 90° C., to thereby spin the mold disc plate.

Abstract: In a plate bonding system for bonding first and second substrate discs (or other plates) with adhesive, there are provided a first section for bringing the first and second substrate discs closer to each other with the interposition of adhesive, and a second section for producing an electric field in the interspace between the first and second substrate discs. The second section produces the field and thereby deforms the adhesive into a tapered shape to minimize the initial contact area and thereby prevent voids from being involved in the adhesive.

Abstract: The charging apparatus charges a load capacitor to a predetermined voltage, and comprises an inverter which is connected to a dc power, a transformer which is connected to the ac side of the inverter, and an inductance which is connected in series to the primary and secondary windings of the transformer and comprises leakage inductance of the transformer, a rectifier which is connected to the secondary side of the transformer, and a switch element which is provided on the secondary side of the transformer. The inverter comprises a switching semiconductor element, connected to the dc power, and a feedback diode, connected in reverse parallel to the switching semiconductor element. The switching element short-circuits the output of the inductance when the charge voltage of the load capacitor has reached a predetermined value, preventing an inertial current, generated by energy which has accumulated in the inductance, from flowing to the load capacitor.

Abstract: The charging apparatus charges a load capacitor to a predetermined voltage, and comprises an inverter which is connected to a dc power, a transformer which is connected to the ac side of the inverter, and an inductance which is connected in series to the primary and secondary windings of the transformer and comprises leakage inductance of the transformer, a rectifier which is connected to the secondary side of the transformer, and a switch element which is provided on the secondary side of the transformer. The inverter comprises a switching semiconductor element, connected to the dc power, and a feedback diode, connected in reverse parallel to the switching semiconductor element. The switching element short-circuits the output of the inductance when the charge voltage of the load capacitor has reached a predetermined value, preventing an inertial current, generated by energy which has accumulated in the inductance, from flowing to the load capacitor.

Abstract: The object of the present invention is to significantly inhibit the formation of voids between substrates bonded together when a liquid adhesive is supplied onto an optical disc substrate or when the optical disc substrate is bonded to another optical disc substrate. Accordingly, the present invention discloses a method for bonding two optical disc substrates together which comprises the steps of joining the optical disc substrates together with an adhesive and curing the adhesive, wherein the adhesive is supplied onto the optical disc substrate by an electric field formed between the adhesive-supplying nozzle, for supplying the adhesive onto the optical disc substrate, and the optical disc substrate, and the two optical disc substrates are then joined together and subjected to spun by a spinning process.

Abstract: A disk bonding system or method comprises a first element for forming an annular adhesive layer on an upwardly facing joint surface of a lower side disk, and a second element for forming a dotted adhesive layer on a downwardly facing joint surface of an upper side disk. Then, a third element sets the upper and lower side disks in a confronting state, and reduces the spacing between the upper and lower side disks until the annular adhesive layer and the dotted adhesive layer are sandwiched between the upper and lower side disks. During this, the annular adhesive layer and the dotted adhesive layer are brought into contact with each other, and the contact region expands in a manner to prevent occurrence of bubbles.

Abstract: The present invention relates to a surface-coated plastic product which has excellent durability such as weatherability, scratch resistance and thermal stability.The present invention relates to, for example, a surface-coated plastic product of a resin selected from the group composed of a polycarbonate resin, an ABS resin, an acrylic resin, a polyvinyl chloride resin, a polyamide resin, a polyphenylene oxide resin or a resin alloy containing these, coated with a coating composed of a curable resin composition containing 100 parts by weight of an acrylic resin of a weight average molecular weight of 2,000 to 30,000, 0.01 to 10 parts in weight of an organometallic compound, 0.01 to 10 parts in weight of a silicon compound containing a silanol group or capable of forming a silanol group by heating or photo-irradiation and 0.01 to 10 parts by weight of a UV absorbent.

Abstract: A method of reforming the surface of a plastic article to provide a leather-like touch to the plastic article surface. In this method, a two-liquid type polyurethane paint is prepared and coated on the surface of the plastic article so as to form a coated film having a thickness ranging from 20 to 150 micrometers and having an elongation percentage ranging from 60 to 180% at 20.degree. C., a coefficient of friction ranging from 0.5 to 0.8, and an initial modulus of elasticity ranging from 60 to 150 kg/cm.sup.2.

Abstract: A system for fabricating a bonded disk, comprises an adhesive supplying section for supplying a liquid adhesive on a first disk, a disk handling section for mating the first disk with a second disk, a spin coating section for spreading the adhesive between the first and second disks and a curing section for curing the adhesive. The disk handling section comprises a disk transfer mechanism for arranging the first and second disks in a confronting state in which the first and second disks confront each other and the adhesive supplied to the first disk is interposed between the first and second disks, and for transferring the first and second disks to the spin coating section so that the first and second disks remain in the confronting state.

Abstract: A switching power supply system comprises a semiconductor switching device for selectively opening and closing a current path from a dc power source to a load, an inductive component connected in series with the switching device, a series combination of a first diode and a voltage clamp, and a control circuit for controlling the switching device. The series combination is connected in parallel to the switching device or the inductive component such as a transformer or an inductor. The first diode has a carrier lifetime equal to or longer than the switching period of the switching device. A discharge circuit is connected between one terminal of the dc power source and a branch point between the first diode and the voltage clamp, and arranged to regulate an amount of energy returned from the voltage clamp to the dc power source.

Abstract: To improve the reliability, operating speed, size of equipment and economy, a disk coating system for forming a coating on a disk such as a compact disk is arranged to transfer disks to and from a pair of spinners with first and second disk transfer mechanisms. The coating system further has an intermittently rotating turntable, an apparatus for supplying a coating material to each disk on the turntable at a predetermined position, and a system for curing a coating layer on each disk. The spinners for removing an excess amount of the coating material are placed between the turntable and the curing system. The first transfer mechanism is for transferring disks from the turntable to the spinners, and the second transfer mechanism is for transferring disks from the spinners to the curing system. The two spinners are substantially equidistant from a predetermined disk position on the turntable. The first transfer mechanism has two arms extending in two directions diverging from a pivot at a predetermined angle.

Abstract: A resonant forward converter comprises a saturable inductor connected in series to a primary winding of a transformer and a switching device. The saturable inductor has a predetermined value of inductance in a light current region and a small value of inductance at a predetermined integral voltage due to magnetic saturation.

Abstract: A high power factor AC/DC converter is disclosed. In the AC/DC converter in which a rectifying circuit RC1 rectifies a commercially available AC power supply Ei, a switching device turns on and off so that the rectified voltage is applied across the primary winding n1 of the transformer Tr1 to provide a high frequency voltage across the secondary winding n2, and the high frequency voltage is rectified by means of a rectifying circuit connected across the secondary winding so as to generate a predetermined DC output, a choke coil (L1) and a diode (D1) are interposed between the rectifying circuit (RC1) and a smoothing capacitor (C1) and a capacitor (C3) is interposed between a first junction and a second junction. The first junction connects the choke coil (L1) to the diode (D1) and the second junction connected the switching device (Q1) to the primary winding (n1) of the transformer (Tr1).