Tdk Corporation

Sanshin Kogyo Kabushiki Kaisha

Takashi Namioka

Haruo Shiba

Masatoshi Okamura

Hideki Hirata

Yasufumi Takasugi

Giichi Shibuya

Kazuki Suzawa

Toshikazu Hosobuchi

Kazuo Fukunaga

Takateru Satoh

Tsutomu Kotani

Takayuki Kohama

It is an object of the present invention is to provide an apparatus for discriminating an optical recording medium and a method for discriminating an optical recording medium which can reliably discriminate the kind of an optical recording medium even in the case where the optical recording medium to be discriminated is formed with periodical undulation in the circumferential direction thereof. The apparatus for discriminating an optical recording medium according to the present invention includes a first electrode, a second electrode, an alternate current signal generation circuitfor applying an alternate current A to the first electrode, a detection circuitfor detecting a level of an alternate current B appearing at the second electrode, and a control circuitfor controlling the operations of the alternate current signal generation circuitand the detection circuit

Apparatus for discriminating optical recording medium and method for discriminating optical recording medium

The present invention provides a method and an apparatus for discriminating the type of an optical recording medium and the number of recording layers in the medium. The apparatus includes a first electrode and a second electrode placed in the vicinity of a light transmission layer of the recording medium, an alternating current signal generation circuit for applying an alternating current A to the first electrode, a detection circuit for detecting the level of an alternating current B appearing at the second electrode, and a control circuit for controlling the operations of the alternating current signal generation circuit and the detection circuit, and a table provided in the control circuit.

It is an object of the present invention to provide an apparatus for discriminating an optical recording medium which can reliably discriminate the kind of an optical recording medium even in the case where the optical recording medium to be discriminated is warped and formed with periodical undulation in the circumferential direction thereof. The apparatusfor discriminating an optical recording medium according to the present invention includes a first electrodea second electrodea third electrodea fourth electrodean alternating current signal generation circuitfor applying an alternating current signal A to the first electrodeand the third electrodea detection circuitfor detecting the level of an alternating current signal Bappearing at the second electrodeand the level of an alternating current signal Bappearing at the fourth electrodea supporting mechanismfor supporting the first electrodeand the second electrodea supporting mechanismfor supporting the third electrodeand the fourth electrodea driving mechanismfor vertically moving the supporting mechanisma driving mechanismfor vertically moving the supporting mechanismand a control circuitfor controlling the operations of the alternating current signal generation circuitthe detection circuitthe driving mechanismand the driving mechanismand a tableis provided in the control circuit

It is an object of the present invention to provide an apparatus for discriminating an optical recording medium and a method for discriminating an optical recording medium which can reliably discriminate the kind of an optical recording medium even in the case where the optical recording medium to be discriminated is warped. The apparatus for discriminating an optical recording medium according to the present invention includes a first electrode, a second electrode, an alternating current signal generation circuitfor applying an alternating current signal A to the first electrode, a detection circuitfor detecting the level of an alternating current signal B appearing at the second electrode, a supporting mechanismfor supporting the first electrodeand the second electrode, a driving mechanismfor vertically moving the supporting mechanism, and a control circuitfor controlling the operations of the alternating current signal generation circuitand the detection circuitand the driving mechanism

A tape cassette capable of permitting a reel spring to be readily and accurately positioned on a casing for its mounting to highly improve workability and productivity in manufacturing of the tape cassette. The tape cassette includes a reel spring which is abutted against tape reels for elastically holding them. The reel spring comprises a spring body formed at an intermediate portion thereof in a longitudinal direction thereof with a plurality of mounting holes through which the reel spring is mounted on an inner surface of an upper casing member. The spring body is provided on each of both sides thereof in the longitudinal direction with one or two positioning recesses, each of which is positioned adjacent to each of the mounting holes.

Tape casette and reel spring therefor

A cartridge for receiving therein a recording/reproducing medium has a casing having a label area in which a label is disposed. A transparent cover covers the label and is attached to the casing via a projection and a recess so as to be opened and closed.

Cartridge for a recording/reproducing medium having a transparent or

A tape cassette capable of ensuring smooth and positive traveling of a magnetic tape in a casing. Sheet elements each are formed with a pair of apertures aligned with hub holes and a strip-like projection projecting toward the inner surface of a casing, which is formed on each of the upper and lower inner surfaces thereof with a land of a width larger than the diameter of the hub hole in a manner to face the projection of the sheet element. The casing is also formed on each of the upper and lower inner surfaces thereof with a pair of recesses in a manner to interpose the land therebetween and the sheet elements each have a pair of end edges extending in the longitudinal direction thereof, which are arranged so as to overhang the recesses of the casing.

Tape cassette casing having biasing element for improved traveling and

A tape cassette comprises a cassette casing composed of upper and lower halves, wherein fixed tape guides each having a partially or completely cylindrical configuration are disposed along a tape transportation path defined within the casing. Each of the tape guides is secured fixedly by press-fitting it onto a continuous or discontinuous polygonal supporting rib dimensioned to be circumscribed by the tape guide.

Structures for fixedly supporting tape guides in a magnetic tape cassette

A magnetic tape cassette capable of highly improving workability and productivity in its manufacturing while ensuring its satisfactory function. The cassette includes a spring for constantly urging each of hub braking levers in a direction of engaging the lever with a reel hub to selectively lock the reel hub. The spring is formed so as to have a substantially straightly extending or flat shape when it is unloaded or in a free state and arranged in a casing in a manner to be constantly kept deflected by cooperation of an urging element and a support element each provided on the hub braking lever and a holding element provided on the casing and constantly abuttedly held at one end thereof on a contact element provided on the hub braking lever.

Magnetic tape cassette

Tape guides for a magnetic tape cassette comprise a half of cylindrical tube each adapted to fit securely over a support post within the housing of the cassette. The method of manufacturing the guides consists of forming thin-walled portions as grooves on at least the inner or outer side of a tube, with or without inwardly protruding ribs, which facilitate the division and provide a tight fit of the half piece to the post, and then dividing the tube along the plane into two halves. The tube is made of a metal, particularly brass or stainless steel, or plastics and formed by drawing or other irregular-shape forming technique, with polishing, plating, and/or precision polishing before division.

Growing community of inventors

Saku, Japan

Takashi Namioka