Optical reading-writing apparatus having a moving unit

Details Optical reading-writing apparatus having a moving unit Optical reading-writing apparatus having a moving unit

1990-12-03

1992-06-30

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

369 4423, H01J 314

Patent

active

051265630

ABSTRACT:
In an optical reading-writing apparatus, moving unit (14) has only a mirror (21) for reflecting a horizontal laser beam in vertical direction, an objective lens (22) for converting the laser beam on a recording face of an optical disc (11) and an objective lens driving device (23), and the moving unit (14) is slidably driven in radial direction by a moving unit driving device (24) and the other optical elements such as a semiconductor laser (15), a collimator lens (16), a mirror (17), a beam splitter (18), a photo-sensor (19) and a signal detecting device (20) are fixed on a base member (13).

REFERENCES:
patent: 4293944 (1981-10-01), Izumita
patent: 4296316 (1981-10-01), Tsuji
patent: 4607157 (1986-08-01), Millar
patent: 4764815 (1988-08-01), Landsman
patent: 4779255 (1988-10-01), Sugiyama et al.
patent: 4850673 (1989-07-01), Velzel et al.
patent: 4918679 (1990-04-01), Opheij et al.
patent: 5012354 (1991-04-01), Tsuchiya

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