Nippon Gakki Seizo Kabushiki Kaisha

Yamaha Corporation

Kazuo Urata

Mikio Ogusu

Yasuhiko Kamoshita

Takuya Tamaru

Yasushi Hayashi

A pick-up angle adjustment apparatus in provided for adjusting an angle of an optical pick-up mounted in an optical disk apparatus. In the pick-up angle adjustment apparatus, a first guide shaft has a first length between a pair of ends thereof for guiding and supporting the optical pick-up. A second guide shaft has a second length between a pair of ends thereof for guiding and supporting the optical pick-up. A first adjustment member is operable for vertically moving one end of the first guide shaft so as to adjust the angle of the optical pick-up. The first adjustment member is capable of moving the one end of the first guide shaft by a first distance when the first adjustment member is operated by a given operation amount. A second adjustment member is operable for vertically moving one end of the second guide shaft so as to adjust the angle of the optical pick-up. The second adjustment member is capable of moving the one end of the second guide shaft by a second distance when the second adjustment member is operated by the same operation amount as applied to the first adjustment member. A distance ratio of the first distance and the second distance is set equal to a length ratio of the first length and the second length.

Pick-up angle adjustment mechanism for optical disk apparatus

An air flow generated during disk rotation is rectified to suppress disk vibrations and prevent the qualities of recorded and reproduced signals from being degraded. Notchesandare formed on top edges of right and left side wallsandof a frame. Opposite ends of a clamp holderalong its long side direction are fixedly mounted on the notchesand. Rectifiers of repetitive structuresandhaving a wave shape as viewed in plan are formed on the clamper holderon the plate portionsandon both sides of a clamperand at edges on the output side of an air flow generated during disk rotation.

Optical disk drive

In a disc playback device in which a disc cartridge case housing a disc is loaded in a disc cartridge case holder of a main body of the device and this holder is moved from a disc non-playback position to a disc playback position for playing back of the disc, a loading system for a disc cartridge case comprises a curved surface portion formed in a corner portion on the side of the disc cartridge case from which the case is inserted into the holder and an uncurved surface portion formed in a corner portion on the side opposite to the side from which the case is inserted into the holder. A case erroneous insertion blocking member having an engaging portion is provided on the holder. If the case in its correct insertion posture is inserted into the holder, the engaging portion of the blocking member cooperates with the curved surface portion of the case to permit the case to be inserted into the holder. If the case in an incorrect insertion posture is about to be inserted into the holder, the engaging portion of the blocking member cooperates with the uncurved portion of the case to prevent the case from being inserted into the inside of the holder.

Loading system for a disc cartridge case housing a disc in a disc

In a disc playback device of a type in which a disc or a disc cartridge case housing a disc is loaded in a holder and the disc is played back upon moving of this holder from a disc loading position to a disc playback position, magnetic attraction generating means is provided for attracting the holder and a chassis carrying a turntable to each other. The magnetic attraction generating means may be constructed by securing a magnet to either the chassis or the holder and forming the other with magnetic substance, or may be constructed by securing magnets to both the chassis and the holder. The holder is securely clamped in position when it has been moved to the disc playback position and anti-vibration characteristics of the holder are thereby improved.

Clamping device for a holder of a disc playback device

In a disc playback device of a type in which a turntable is connected to a disc motor shaft, a device for preventing vibration of the disc motor shaft comprises magnetic biasing means for generating a magnetic force biasing the disc motor shaft in an axial or radial direction of the shaft. The magnetic biasing means is constructed by securing one of magnetic substance and a magnet to the turntable and disposing the other below the turntable or securing one of two magnets to the turntable and disposing the other magnet below the turntable. For preventing vibration of the disc motor shaft in the radial direction, a yoke plate is fixed to the magnet in such a manner that a part of the yoke plate is positioned on the lateral side of the magnetic substance or the other magnet.

Device for preventing vibration of a disc motor shaft in a disc playback

In a disc playback device of a type in which a turntable is connected to a disc motor shaft, a disc centering device comprises at least three disc centering members provided in the turntable substantially concentrically with the disc motor shaft and separately moveably in the radial direction of the turntable, the centering members being capable of engaging a central opening of a disc, and urging means provided in the turntable for urging the centering members radially outwardly of the turntable. The centering members engaged in the central opening of the disc work in association with the urging means to position the disc concentrically with the disc motor shaft.

Disc centering device for a disc playback device

A disc loading device in a disc playback device comprises a turntable for rotating a disc thereon, a holder which is provided above this turntable for holding a disc or a case housing a disc and is capable of moving upwardly or downwardly with respect to the turntable and a carrier which is capable of moving horizontally with respect to the holder for loading the disc or the case into the holder or ejecting it from the holder. A cam is provided in the holder which cooperates with a hole formed in the carrier to move the holder upwardly or downwardly in loading and ejection of the disc or the case. A clamper may be provided on the holder for fixing the disc to the turntable.

Loading device in a disc playback device

A disc playback device comprises a loading device for transferring a disc or a case housing a disc between an eject position in which the disc or the disc case is inserted and ejected and a playback position in which the disc can be played, thereby performing loading and eject modes, a feed device for feeding a pickup head which reads data recorded on the disc in a playback mode in a radial direction of the disc set in the playback position, and a single drive source for driving both the loading device and feed device. The single drive source drives the feed device and the loading device is driven through the feed device. A carrier having a carrier rack moved by the drive source and a carrier pinion meshing with the carrier rack are provided in a drive system for a loading pinion meshing with a disc case rack and the loading pinion is connected to the carrier pinion through clutch means.

Disc playback device

A shutter plate control device in a disc playback device energizes a shutter plate in a disc magazine case with opening and closing members provided in a main body of the disc playback device. The opening member engages with a shutter lever provided on the shutter plate in loading of the disc magazine case to move the shutter plate in a direction for opening an aperture formed in the disc magazine case for exposing the disc to a pickup head to enable the pickup head to read date recorded on the disc. The closing member engages with the shutter lever in loading of the disc magazine case to be displaced by the shutter lever and thereby permit the shutter lever to pass by without moving the shutter plate while it engages with the shutter lever in ejecting of the disc magazine case to move the shutter plate in a direction for closing the aperture.

Shutter plate control device in a disc playback device

A braking device for providing a braking action to the horizontal swinging movement of a pickup arm of a record player and the like. The device comprises a brake for applying the braking action and an actuator for actuating the brake, when the pickup arm is in a non-playing mode, to provide the braking action.

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Hamamatsu, Japan

Kazuo Urata