Optical pick-up device with convergent light diffraction for...

Details Optical pick-up device with convergent light diffraction for... Optical pick-up device with convergent light diffraction for...

2005-01-18

2005-01-18

Young, W. R. (Department: 2652)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112140, C369S112280

Reexamination Certificate

active

06845077

ABSTRACT:
An optical pick-up device for recording/reading an optical recording medium is provided, which can efficiently utilize light emitted from the laser light source. The optical pick-up device includes a light source, an optical system, a quarter-wave plate, a diffraction component, and a photodetector unit. The photodetector unit may further include a transmitting portion for transmitting the light beam emitted from the light source, and may be disposed opposite the light source in a vicinity of the light source so that light emitted from the light source is transmitted through the transmitting portion. The transmitting portion may be an aperture provided in the photodetector unit. Alternatively, the optical pick-up device may further include an optical path separator for separating the diffracted returning light beam from the light beam that passes from the light source to the diffraction component.

REFERENCES:
patent: 4733065 (1988-03-01), Hoshi et al.
patent: 4823335 (1989-04-01), Shikama et al.
patent: 5172368 (1992-12-01), Lehureau
patent: 5477386 (1995-12-01), Okuda et al.
patent: 5541906 (1996-07-01), Kobayashi
patent: 5608708 (1997-03-01), Ophey
patent: 5621716 (1997-04-01), Kojima et al.
patent: 5627806 (1997-05-01), Kobayashi
patent: 5694385 (1997-12-01), Takahashi et al.
patent: 5712841 (1998-01-01), Opheij et al.
patent: 5923636 (1999-07-01), Haruguchi et al.
patent: 6278681 (2001-08-01), Nagano
patent: 6584060 (2003-06-01), Oohchida et al.
patent: 3-225636 (1991-10-01), None

Affiliated with

Also associated with

Rating

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3414638