An optical head having a rotating mirror

Details An optical head having a rotating mirror An optical head having a rotating mirror

1994-09-19

1996-09-24

Epps, Georgia Y.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 4423, 369119, 369116, 369 4441, G11B 700

Patent

active

055597831

ABSTRACT:
An optical head device for irradiating a light beam onto a recording medium to optically reproduce information recorded on the recording medium, the device includes a light source for generating a light beam to project onto the recording medium, a detector for detecting the light beam reflected from the recording medium, and an optical system for leading the light beam from the light source to the recording medium along a first optical axis and leading the light beam reflected from the recording medium along the first optical axis to the detector. The device further includes a half mirror arranged between the optical system and the recording medium, for reflecting a part of the light beam led to the recording medium toward the optical system to lead the part of the light beam onto the detector. The half mirror is tilted at a prescribed angle against the first optical axis to lead the part of the light beam reflected along a second optical axis differ from the first optical axis to the detector.

REFERENCES:
patent: 4198657 (1980-04-01), Kanamaru
patent: 4782474 (1988-11-01), Arai et al.
patent: 5105407 (1992-04-01), Ishika
patent: 5218524 (1993-06-01), Kasahara et al.
patent: 5313447 (1994-05-01), Takeshita et al.
patent: 5357102 (1994-10-01), Ishika
patent: 5365504 (1994-11-01), Noguchi
patent: 5420848 (1995-05-01), Date et al.

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