Disc-clamping mechanism and disc driving apparatus
View Patent ↗A simplified disc-clamping mechanism is provided to decrease the number of parts and processes of the assembly of a disc-clamping mechanism. The disc-clamping mechanism has a clamping plate sandwiching a disc by cooperating with a turntable, and a clamp base rotatably holding the clamping plate. The clamping plate has a surface plate pressing a disc toward the turntable, a small-radius body portion having an outer diameter smaller than that of the surface plate portion, and a flange portion protruding more than an end portion in an axial direction of the small-radius body portion and being parallel to the surface plate portion. The clamp base is integrally formed while including a thin-plate shaped holding portion, a stopper piece, and a bent portion which extends from the holding portion.
1. A disc-clamping mechanism comprising:
a clamping plate sandwiching a disc by cooperating with a rotatable turntable; and
a clamp base which rotatably holds the clamping plate, allowing movement between a clamp-position where the clamping plate contacts with the disc on the turntable, and a clamp-released position where the clamping plate is isolated from the disc,
wherein the clamping plate comprises
a surface plate portion pressing the disc toward the turntable when the clamp base is in the clamp-position,
a small-radius body portion placed concentrically with the surface plate portion and having an outer diameter smaller than that of the surface plate portion, and
a flange portion being parallel to the surface plate portion and protruding more than an end portion in an axial direction of the small-radius body portion,
wherein the clamp base is integrally formed while including
a thin-plate shaped holding portion interposed between the surface plate portion and the flange portion on the clamping plate,
a stopper piece facing an end surface of the flange portion in the clamp-position, and
a bent portion extending from the holding portion and having an elongated hole through which the flange portion is passed from the stopper piece side to the holding portion side in a diameter direction of the flange portion,
wherein the holding portion has a cut hole which receives the small-radius body portion, the cut hole being adjacent to the elongated hole of the bent portion.
2. The disc-clamping mechanism according to claim 1 ,
wherein the thickness of the holding portion is smaller than any other part of the clamp base.
3. The disc-clamping mechanism according to claim 2 ,
wherein, when the clamp base is in the clamp-released position, the disc-clamping mechanism comprises a lock means that limits a movement of the clamping plate, and
the lock means comprises
a first lock means that limits a movement in the axial direction of the clamping plate by pressing the clamping plate toward the turntable and
a second lock means that limits a movement in a diameter direction of the clamping plate by closely contacting the outer-edge of the clamping plate.
4. A disc driving apparatus comprising:
a disc-clamping mechanism according to claim 2 .
5. The disc-clamping mechanism according to claim 1 ,
wherein, when the clamp base is in the clamp-released position, the disc-clamping mechanism comprises a lock means that limits a movement of the clamping plate, and
the lock means comprises
a first lock means that limits a movement in axial direction of the clamping plate by pressing the clamping plate toward the turntable and a second lock means that limits a movement in a diameter direction of the clamping plate by closely contacting the outer-edge of the clamping plate.
6. A disc driving apparatus comprising:
a disc-clamping mechanism according to claim 5 .
7. A disc driving apparatus comprising:
a disc-clamping mechanism according to claim 1 .