Optical information recording and reproducing device

Abstract

Abstract PURPOSE:To attain quick retrieval of a track by providing a hole for fitting a sensor to a permanent magnet, fitting a sensor for setting position to the hole and providing a means preventing occurrence of vibration of an objective lens at the start and end of coarse retrieval through the use of the output of sensor. CONSTITUTION:A throughhole 58 provided to a permanent magnet 51 and a throughhole 59 provided to a permanent magnet 52 for mounting a sensor 41 are arranged so as not to be unsymmetrically to the right/left. In applying coarse retrieval, a signal pulse in matching with the number of tracks to which moving is requested is supplied to a feed motor moving the entire optical pickup 25, a carriage 24 is moved to exert acceleration to the pickup 25 and a moving member 55 is moved in a direction reverse to the moving direction of the carriage 24. A current flowing to a tracking coil 40 forms a magnetic flux distribution to part the moving member 55 from the sensor 41 so as to prevent the moving member from being moved thereby keeping it to be balanced position. Thus, accurate retrieval is attained without awaiting the vibration after coarse retrieval so as to complete the quick track retrieval.

Inventors

• 👤 Kunio Yamamiya
• 👤 国雄 山宮

Bibliographic Details