JPH03130046U - - Google Patents

Description

[Brief explanation of the drawing]

Fig. 1a is a perspective view showing a centering mechanism of an optical disk according to an embodiment of this invention, Fig. 1b is a schematic plan view showing the same embodiment, and Fig. 1c is an angle of a turntable in the same embodiment. A diagram showing the detection pattern, FIG. 2 is a block diagram of the control circuit in the same embodiment,
FIG. 3a is a perspective view showing a conventional example of an optical disk centering mechanism, and FIG. 3b is a schematic plan view showing the same optical disk centering mechanism. 1... Spindle motor, 2... Rotating shaft, 3... Turntable, 4... Centering holder, 5... Clamper,
6... Optical sensor, 7... Optical pickup, 8... Optical disk, 9... Eccentricity detection circuit, 10... Clamper drive circuit, 11... Angle detection circuit, 12... Control circuit, 1
3...Spindle motor drive circuit.

Claims (1)

[Scope of utility model registration request] The optical disk is clamped on a turntable having a centering holder eccentric to the average eccentricity of the optical disk, the tracking servo is turned off, and the eccentricity of the optical disk track from the spindle motor rotation axis is detected from the traverse signal. After rotating the optical disk and turntable relative to each other so that the eccentricity of the optical disk and the eccentricity of the centering holder cancel each other out and the amount of eccentricity of the optical disk track from the spindle motor rotation axis is minimized, An optical disc centering mechanism in an optical disc recording and reproducing apparatus configured to play a disc.