Optical head

Abstract

Abstract PURPOSE:To make an access control highly accurate by accurately detecting the current position of an objective lens by making the light beam for position detection fed via an optical path converting means from an optical system incident. CONSTITUTION:An optical system 100 is made to project the light beams 100a, 100b for detecting a position toward an optical path converting means 403 and arranges as well by fixing along a guide member 300 the position detector 600 detecting the position of a mobile member 400 by detecting the light beam 100a, 100b detecting the position from this optical path converting means 403. The optical path converting means is made to bend the light beam 100a, 100b for position detection in about orthogonal direction with its progressing direction and a position detector 600 is made by a semiconductor position detector as well. The present position of an objective lens 406 can thus be detected accurately without enlarging the weight and volume of a mobile part and the higher accuracy in the access control is realized thereby.

Inventors

• 👤 Isamu Nose
• 👤 Yutaka Mazaki

Bibliographic Details