Optical recording and reproducing apparatus with separated high and low frequency servo signals
US5247503A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 29, 1992 |
| Grant date | Sep 21, 1993 |
| Priority date | — |
| Expiry date | Apr 29, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/0901
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A fixed section of an optical recording and reproducing apparatus is provided with an actuator for optically controlling the fine tracking of a laser beam to be held at a predetermined position, by moving a diverging convex lens of a relay lens in a direction perpendicular to that of the optical axis; first and second filter circuits for separating a tracking error signal outputted from a differential amplifier connected to a two-split light-receiving element into a high-frequency-side signal and a low-frequency-side signal respectively; a first driving control circuit for controlling the driving of a linear motor for moving a movable section of the apparatus on the basis of the low-frequency-side signal separated by the first filter circuit; and a second driving control circuit for controlling the driving of the actuator on the basis of the high-frequency-side signal separated by the second filter circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.