Claims
- 1. An optical disc apparatus for driving an optical disc in which a plurality of sectors on which an information signal is recorded are physically provided in spiral tracks, the optical disc apparatus comprising:
- a spindle motor having a spindle for rotating the optical disc;
- rotation detecting means for detecting a rotation of the spindle of the spindle motor and, responsive thereto, outputting a control signal with each complete rotation of the spindle of the spindle motor;
- an optical pickup disposed in an opposing relation to a disc surface of the optical disc for moving a reproducing light beam in the radial direction of the optical disc; and
- driving means for driving the optical pickup so that the control signal directly causes the optical pickup to move the light beam by one track in the radial direction of the optical disc so that the light beam retraces the same track
- wherein:
- the optical pickup includes an objective lens for causing the light beam to be focused on the disc surface, the optical pickup including a tracking means for moving the objective lens in the radial direction of the optical disc, the movement of the light beam by one track in the radial direction of the optical disc being accomplished by the driving means actuating the tracking means so that the objective lens is moved in the radial direction; and
- the rotation detecting means includes an encoder for generating a plurality of pulses per rotation of the spindle of the spindle motor so that each pulse of the plurality of pulses is generated in response to the rotation of the spindle motor, a counter for counting pulses from the encoder and comparing means for comparing count data from the counter with reference data, and the rotation detecting means detects one rotation of the spindle motor when the comparing means detects that the count data and the reference data become coincident with each other.
- 2. In combination, an optical disc and an apparatus for driving the optical disc comprising:
- an optical disc in which a plurality of sectors in which an information signal is recorded are provided in spiral tracks, each spiral track having the same number of sectors which are equal in length taken in a circumferential direction;
- a spindle motor having a spindle for rotating the optical disc;
- rotation detecting means for detecting a rotation of the spindle motor and, responsive thereto, outputting a control signal with each complete rotation of the spindle of the spindle motor;
- an optical pickup disposed in an opposing relation to a disc surface of the optical disc for moving a reproducing light beam in the radial direction of the optical disc; and
- driving means supplied with the control signal for driving the optical pickup so that the control signal directly causes the optical pickup to move the light beam by one track in the radial direction of the optical disc so that the light beam retraces the same track.
Priority Claims (1)
Number |
Date |
Country |
Kind |
4-096830 |
Apr 1992 |
JPX |
|
Parent Case Info
This is a continuation of application Ser. No. 08/047,231, filed on Apr. 14, 1993, now abandoned.
US Referenced Citations (6)
Foreign Referenced Citations (3)
Number |
Date |
Country |
2083266A |
Mar 1982 |
GBX |
2088088A |
Mar 1982 |
GBX |
2103864A |
Feb 1983 |
GBX |
Non-Patent Literature Citations (2)
Entry |
Patent Abstracts of Japan vol. 010 No. 035 (E-380), 12 Feb. 1986 & JP-A-60 191595 (Nippon Hoso Kyokai; Others: 01) 30 Sep. 1985. |
Patent Abstracts of Japan vol. 006 192 (P-145), 30 Sep. 1982 & JP-A-57 103165 2 (Pioneer Electronic Corp; Others: 01) 26 Jun. 1982. |
Continuations (1)
|
Number |
Date |
Country |
Parent |
47231 |
Apr 1993 |
|