Pickup controller

Abstract

Abstract PURPOSE: To reduce components in number and also to miniaturize a controller by providing mechanisms for focusing control and track control to one controller and then by enabling one elastic body to perform control operation. CONSTITUTION: Laser beam 14 emitted by semiconductor laser 12 is focused by condenser lens 13 and photo detector 15 detects the variation in the quantity of reflected light from disk 7. In body tube 20 containing this optical system, coils 16 and 17 are arranged in magnetic flux provided by magnets 19 and 18. Then, body tube 20, rotatable on a C-C axis, moves in a light axial direction and is also supported by plate-shape elastic body 21 which can operate in a track intersection direction perpendicular to it. Then, two axes can be controlled by one elastic body by flowing a current needed for displacement operation in a focus control direction and that for the displacement in a track control direction through coils 16 and 17 respectively. Therefore, the components can be reduced in number while the unit is miniaturized. COPYRIGHT: (C)1980,JPO&Japio

Inventors

• 👤 Kenjiro Kime
• 👤 Kazuo Okada
• 👤 Mitsushige Kondo

Bibliographic Details