Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1995-12-29
1997-09-02
Epps, Georgia Y.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369122, 369116, 369120, 372 98, 372102, 372 50, G11B 700, H01S 308
Patent
active
056639449
ABSTRACT:
There is provided a device for monitoring the light output of a VCSEL and a recording and reproducing optical pick-up adopting the device. The device for monitoring the light output of a VCSEL has a half mirror positioned in front of a VCSEL, for reflecting a portion of the light emitted from the VCSEL, and a monitoring optical detector positioned behind the VCSEL, for detecting the light reflected from the half mirror. The recording and reproducing optical pick-up employing the device includes a VCSEL having a light-emitting surface for emitting light vertically from the light-emitting surface, a light output monitor for monitoring the light output of the VCSEL, an objective lens for concentrating incident light on an optical recording medium to form an optical spot thereon, a light path changer for changing a path of the light reflected from the optical recording medium, and a first optical detector for receiving the reflected light and detecting an error signal and an information signal. The light output monitor comprises a half mirror positioned in front of the VCSEL, for reflecting a portion of the light emitted from the VCSEL, and a second monitoring optical detector positioned behind the VCSEL, for detecting the light reflected from the half mirror.
REFERENCES:
patent: 5132982 (1992-07-01), Chan et al.
patent: 5136603 (1992-08-01), Hasnain et al.
patent: 5285466 (1994-02-01), Tabatabaie
patent: 5295147 (1994-03-01), Jewell et al.
patent: 5475701 (1995-12-01), Hibbs-Brenner
Chu Kim-Kwok
Epps Georgia Y.
Samsung Electronics Co,. Ltd.
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