Optical pickup device

Details Optical pickup device Optical pickup device

1997-04-09

1998-08-11

Chan, Eddie P.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 4423, 369 4437, 369 94, 369 4424, 369118, G11B 700

Patent

active

057937346

ABSTRACT:
To reduce a weight of an optical pickup device that may reproduce information recorded in a plurality of kinds of optical discs having different use wavelengths, a laser beam light source 1 and a hologram optical unit 14 are provided as light sources for emitting light to reproduce the information of the optical discs having different use wavelength. In order to introduce the light into recording layers of the optical discs 2a and 2b, an actuator moving area 7 is disposed in the emission space of the light. The actuator moving area 7 is composed of a numerical-aperture-controlling filter 8 and an objective lens 9. Due to the change of the focusing position of the objective lens 9 by the numerical-aperture-controlling filter 8 in response to a kind of the optical discs 2a and 2b, the light beam is optimally converged to the recording layers of the optical discs 2a and 2b, respectively.

REFERENCES:
patent: 5625613 (1997-04-01), Kato et al
patent: 5638353 (1997-06-01), Takahashi
patent: 5659533 (1997-08-01), Chen et al.

Affiliated with

Also associated with

Rating

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-396864