Optical pick-up device

Details Optical pick-up device Optical pick-up device

1992-05-26

1993-03-09

Hannaher, Constantine

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369131, G11B 785

Patent

active

051930838

ABSTRACT:
An optical pick-up device comprises a light source, a light beam switching unit, a light intensity change unit and a signal detection unit including photodiodes.
A light beam emitted from the light source and irradiated on an information recording medium has a wavelength for recording information and a wavelength, different from the former, for the reproducing information. The light beam switching unit carries out switching between a light having the wavelength for recording information and a light having the wavelength for reproducing information.
The light intensity change unit transmits or reflects the light beam having the wavelength for recording information with attenuation to prevent a saturation of the photodiodes and transmits or reflects the light beam having the wavelength for reproducing information without attenuation. The light beam thus produced is detected by the signal detecting unit, and the servo control such as focusing servo, etc. is carried out on the basis of the detected signal.

REFERENCES:
patent: 5042020 (1991-08-01), Endo

Affiliated with

Also associated with

Rating

Optical pick-up device does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Optical pick-up device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical pick-up device will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-214555