Abstract: An optical pickup has a base having a screw hole, a holder attached to the base, a laser diode held by the holder, a leaf spring, and an adjusting screw. The holder is formed of a substantially rectangular metal plate having short and long sides and is formed with a laser hole for fitting the laser diode through a center thereof. An angular fulcrum is formed at the center of a back surface of the holder along a direction parallel to the short side. The fulcrum is brought into abutment with the base via the leaf spring and one end of the holder is urged toward the base by the leaf spring. The holder is temporarily secured to the base by screwing the adjusting screw through an insertion hole formed at the other end of the holder into the screw hole of the base.

Abstract: There is provided an inexpensive fixing structure in which the fixing position of a spindle motor against a traverse chassis is fixed in the direction of the movement of an optical pickup (first direction), while can be adjusted sufficiently in the direction perpendicular thereto (second direction). In the bottom surface of the spindle motor 2, there are formed: an elongated reference hole 21, the longitudinal direction of which extends in the radial direction centering on the main shaft 4; and three screw holes 22A, 22B, and 22C spaced out in the circumferential direction centering on the main shaft 4, and in the traverse chassis 1, there are formed: a protrusion 31 adapted to be engaged with the reference hole 21 when the reference hole 21 is arranged in an elongated manner in the second direction; and elongated through holes 32A, 32B, and 32C elongated in the second direction at the positions corresponding to those of the respective screw holes 22A, 22B, and 22C.

Abstract: A first groove, a second groove, and a prepared hole are formed in a traverse chassis. The first groove restricts the downward movement of a printed circuit board as a lower edge portion of the board is slidably pinched in the first groove. The second groove restricts the sliding movement in one direction of the board as an edge portion on one side of both lateral sides of the board whose lower edge portion is nipped in the first groove is fitted in the second groove. The prepared hole vertically penetrates a portion of the traverse chassis defining the first groove and is disposed adjacent to an edge portion on another side of the both lateral sides of the board whose edge portion on the one side is fitted in the second groove.

Abstract: In an optical head according to the present invention, an act base on which an objective lens is arranged is formed in a rectangular shape with through holes formed in four corners thereof. A base on which a collimating lens is arranged has projections to engage with the through holes in correspondence with the through holes when the act base is arranged. With the through holes of the act base engaged with the projections of the base, an adhesive is injected to the through holes to thereby fix the act base to the base. This improves the accuracy in bonding between the base and the act base, and permits laser light of a more stable intensity accordingly to be irradiated to the optical disc, thus permitting suppressing failure involved in data recording or reading.

Abstract: There is provided an optical pickup capable of improving the vibration resistance without causing a reduction in assembling workability and thereby mass productivity or the servo performance thereof. An optical pickup is mounted astride a main shaft 101 and a secondary shaft 102. The travel of the optical pickup is adapted to be guided by the main shaft, where a secondary bearing part 3 adapted to slide relative to the secondary shaft 102 includes an overlapping sliding face 32 and an auxiliary overlapping face 36, and a clearance ? is formed between the auxiliary overlapping face 36 and the secondary shaft 102 to improve assembling workability. A control element 41 is mounted on a printed circuit board 4 mounted on a base member 1, and the control element is overlapped with a radiator plate 5.

Abstract: A reception apparatus and reception method for converting symbol data to a reception bit string efficiently with a small amount of calculation. A despreading section (110) despreads a received signal. A coherent detection section (120) carries out coherent detection of a despread signal obtained by despreading the received signal using a corrected channel estimate value output from an estimate value correction section (170). A RAKE combining section (130) RAKE-combines the signal subjected to coherent detection. A phase rotation section (140) adds phase rotation corresponding to a channelization code to the RAKE-combined signal. A QPSK demapping section (150) demodulates the signal output from the phase rotation section (140) and outputs a reception bit string. A channel estimation section (160) carries out channel estimation using the received signal. The estimate value correction section (170) adds (?/4) phase rotation to each channel estimate value output from the channel estimation section (160).

Abstract: A flexible printed board mounting structure includes a main body that has an attachment portion on its rear side surface, and a flexible printed board that is attached to the rear side surface and the attachment portion of the main body. The surface of the attachment portion is substantially perpendicular to the rear side surface. The flexible printed board includes a first area that is at least partially attached to the rear side surface of the main body, an attachment area to which a light-receiving IC is attached, the attachment area being attached to the attachment portion of the main body, and a connecting portion that is unitarily formed with the first area and the attachment area and connects the first area and the attachment area in a deflective manner. The position of the light-receiving IC can be easily adjusted relative to the attachment portion of the main body.

Abstract: In a processing section 4, allowable gain-value range defining unit 41 measures a gain value k corresponding to a level ratio between an MPP signal and an SPP signal generated by a tracking error signal generating circuit 3 to define an allowable range of the gain value, and eccentricity measuring unit 42 measures an eccentricity of an optical disk. If the eccentricity is determined to be greater than or equal to a predetermined value by eccentricity determining unit 43, gain-value defining unit 44 selects a minimum value of the gain value k to define the minimum value as a gain value k of an amplifier 37. On the other hand, if the eccentricity is determined to be less than the predetermined value, the gain-value defining unit 44 selects a central value of the gain value k to define the central value as the gain value k of the amplifier 37.

Abstract: This chucking apparatus 1 is an apparatus for holding a disk 5 which has been placed on a turntable 3 of a disk player, and includes a magnet 13, a chuck disk 11, a chuck arm 17, first engaging faces 13b and second engaging faces 25c. The chuck disk 11 is arranged so as to be faced with the turntable 3, and adapted to hold the magnet 13. The chuck disk 11 is a disc-like member which has a plurality of claws 25 formed around the magnet 13 which has been held and projecting toward the turntable 3, and engaging parts 25a provided at distal end portions 25a of the plurality of claws 25 to be engaged with an outer circumference of the magnet 13. The chuck arm 17 holds the chuck disk 11 rotatably. The first and the second engaging faces 13b and 25c restrict the engaging parts 25a of the claws 25 from deflecting in a direction away from the magnet.

Abstract: An optical pickup has a base having a screw hole, a holder attached to the base, a laser diode held by the holder, a leaf spring, and an adjusting screw. The holder is formed of a substantially rectangular metal plate having short and long sides and is formed with a laser hole for fitting the laser diode through a center thereof. An angular fulcrum is formed at the center of a back surface of the holder along a direction parallel to the short side. The fulcrum is brought into abutment with the base via the leaf spring and one end of the holder is urged toward the base by the leaf spring. The holder is temporarily secured to the base by screwing the adjusting screw through an insertion hole formed at the other end of the holder into the screw hole of the base.

Abstract: A disk player is configured so that a steel plate-made clamper plate 3 is bridged between wall parts 2a of both sides of a cabinet and is fixed and a disk D on a tray 1 is clamped by a turntable 7 and a clamper 5 and the disk D is rotated by the turntable 7 and information recorded on the disk D is read by an optical pickup, spiral reinforcement portions 3c are formed by closely folding both side edges of the clamper plate 3 in a manner of winding at least two times.

Abstract: A rotary tray having a plurality of disk mounting sections is pivotally supported by a central shaft arranged on a tray support face of a casing, a rim protruding from a lower face of the rotary tray is movably set on a sliding face block arranged in an outer circumferential section of the tray support face, and disk mounted on a desired disk mounting section is opposed to an optical pickup when the rotary tray is intermittently rotated by a predetermined angle, and the sliding face block is engaged in a space formed between a recess step circumferential face, which is formed along an inner edge of an outer circumferential section of the tray support face, and a support frame integrally formed in the outer circumferential section and being opposed to the recess step circumferential face.

Abstract: A turntable driving device has a spindle motor 5, a bearing 7, and a wire spring 9. The spindle motor 5 has a rotation shaft 11 which is to be coupled to the turntable 3. The bearing 7 is placed on the lateral side of the rotation shaft 11, and has a pair of inclined faces 7a that are opened in the side of the rotation shaft 11 so as to sandwich the rotation shaft 11, and that are formed to be abuttable against the rotation shaft 11. The wire spring 9 is a member for urging the bearing 7 toward the rotation shaft 11.

Abstract: Lead wires (10) are soldered at their one ends respectively to lands (120) on a wiring board (100) while the other ends of the lead wires are connected to an electrical part mounted on a movable member (200). A portion of each of the lead wires (10) is passed through a U-shaped notch (130) in the wiring board (100), and a loop portion (16), formed at another portion of each lead wire (10), is loosely fitted on a projected piece portion (140) of the wiring board (100).

Abstract: A chucking apparatus 1 includes a chuck disk 11 and a chuck arm 17. The disk 11 is a disk lockable with a turn table 3. The arm 17 has an opening 33 through which the chuck disk 11 is insertable, and a holding part 31 where the disk 11 is rotatably arranged, plural first hooks 35 projecting inwardly radially from an edge of the opening 33, and a second hook 37 provided at the edge of the opening 33 for preventing the disk 11 in the part 31 from escaping outward. The hooks 35 allow insertion of the disk 11 in the part 31 and support the disk 11 in the part 31. The second hook 37 is shaped to have rigidity against a force received when the disk 11 tends to escape from the holding part than that against a force received when the disk 11 is mounted.

Abstract: A rotary tray having a plurality of disk mounting sections is pivotally supported by a central shaft arranged on a tray support face of a casing, a rim protruding from a lower face of the rotary tray is movably set on a sliding face block arranged in an outer circumferential section of the tray support face, and disk mounted on a desired disk mounting section is opposed to an optical pickup when the rotary tray is intermittently rotated by a predetermined angle, and the sliding face block is engaged in a space formed between a recess step circumferential face, which is formed along an inner edge of an outer circumferential section of the tray support face, and a support frame integrally formed in the outer circumferential section and being opposed to the recess step circumferential face.

Abstract: A hydrogen-absorbing alloy electrode is prepared by reducing an oxide or hydroxide residing on the surface of a hydrogen-absorbing alloy particle while the alloy particle is held in an atmosphere of a hydrogen gas maintained at a temperature where absorbing of a hydrogen gas does not substantially occur; cooling the atmosphere from a temperature where absorbing of the hydrogen gas does not substantially occur to a temperature where the equilibrium hydrogen pressure of the hyrogen-absorbing alloy is equal to the hydrogen pressure in the atmosphere of the hydrogen gas and thereafter vacuum-evacuating and removing the hydrogen gas so that the hydrogen-absorbing alloy particle is cooled to room temperature while the hydrogen gas is exhausted; and thereafter introducing argon, nitrogen or carbon dioxide gas into the atmosphere, thereby returning the atmosphere to normal atmospheric pressure; and immersing the hydrogen-absorbing alloy particle so prepared in a solution containing an oxidation inhibiting agent.

Abstract: This chucking apparatus 1 is an apparatus for holding a disk 5 which has been placed on a turntable 3 of a disk player, and includes a magnet 13, a chuck disk 11, a chuck arm 17, first engaging faces 13b and second engaging faces 25c. The chuck disk 11 is arranged so as to be faced with the turntable 3, and adapted to hold the magnet 13. The chuck disk 11 is a disc-like member which has a plurality of claws 25 formed around the magnet 13 which has been held and projecting toward the turntable 3, and engaging parts 25a provided at distal end portions 25a of the plurality of claws 25 to be engaged with an outer circumference of the magnet 13. The chuck arm 17 holds the chuck disk 11 rotatably. The first and the second engaging faces 13b and 25c restrict the engaging parts 25a of the claws 25 from deflecting in a direction away from the magnet.

Abstract: A chucking apparatus 1 includes a chuck disk 11 and a chuck arm 17. The disk 11 is a disk lockable with a turn table 3. The arm 17 has an opening 33 through which the chuck disk 11 is insertable, and a holding part 31 where the disk 11 is rotatably arranged, plural first hooks 35 projecting inwardly radially from an edge of the opening 33, and a second hook 37 provided at the edge of the opening 33 for preventing the disk 11 in the part 31 from escaping outward. The hooks 35 allow insertion of the disk 11 in the part 31 and support the disk 11 in the part 31. The second hook 37 is shaped to have rigidity against a force received when the disk 11 tends to escape from the holding part than that against a force received when the disk 11 is mounted.

Abstract: A pickup device including a movable frame that holds a pickup, and a main shaft and a sub shaft that guide travelling of the movable frame. The other end portion of the main shaft, and one and the other portions of the sub shaft are attached to a support frame via tilt adjusting mechanisms, respectively. The tilt adjusting mechanisms each includes a rising end face, a spring member which always elastically urges the end portion of the shaft in an upward direction, a countersunk head screw, and a tapped hole into which the countersunk head screw is to be screwed.