Recording/reproducing optical head apparatus compatible with dif

Details Recording/reproducing optical head apparatus compatible with dif Recording/reproducing optical head apparatus compatible with dif

1995-03-10

1999-07-27

Young, W. R.

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369112, G11B 700

Patent

active

059302143

ABSTRACT:
An optical head apparatus includes a stationary optical system having a light source and a detector for detecting light reflected by a recording medium, which stationary optical system is arranged at a position fixed to the recording medium. Plural objective lenses for focusing/irradiating light emitted from the light source onto the recording medium are arranged on a rotating blade which is provided to be rotatable in a direction parallel to the recording medium. By controlling the waveform of a current to be supplied to a tracking coil, the blade is rotated and a desired one of the objective lenses is located on an optical axis of the light irradiated onto the recording medium.

REFERENCES:
patent: 5157555 (1992-10-01), Reno
patent: 5446565 (1995-08-01), Komma et al.
patent: 5541900 (1996-07-01), Ito et al.

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