Optical write/read unit with selective-transparency cover

Details Optical write/read unit with selective-transparency cover Optical write/read unit with selective-transparency cover

1983-05-12

1985-12-24

McElheny, Jr., Donald

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369284, 369291, G11B 700

Patent

active

045610860

ABSTRACT:
An optical write/read unit includes a support, an overlying record layer that is constructed for writing or reading with a predetermined light wavelength(s) and is absorptive to light of other wavelengths and a protective cover means that is selectively transparent to light of at least one of said predetermined wavelength(s). In one embodiment the disc unit is adapted for writing and reading with the same light wavelength and the cover means blocks other light wavelengths. In another embodiment the disc unit is adapted to reading with light of wavelength substantially different than the writing wavelength and the cover means selectively transmits the operative (write and read) wavelengths and selectively blocks a large proportion of other light wavelengths. In another embodiment the cover means is selectively transmissive to the reading wavelength and is displaceable to permit writing light onto the record layer.

REFERENCES:
patent: 3689768 (1972-09-01), Sato et al.
patent: 3906510 (1975-09-01), Hattori et al.
patent: 4038663 (1977-07-01), Day et al.
patent: 4039764 (1977-08-01), Bricot et al.
patent: 4074282 (1978-02-01), Balas, Jr. et al.
patent: 4090031 (1978-05-01), Russell
patent: 4340959 (1982-07-01), Levin
patent: 4360908 (1982-11-01), Howe et al.
patent: 4365258 (1982-12-01), Geyer et al.
patent: 4394661 (1983-07-01), Peeters
patent: 4404656 (1983-09-01), Cornet
patent: 4412231 (1983-10-01), Namba et al.

Affiliated with

Also associated with

Rating

Optical write/read unit with selective-transparency cover 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 write/read unit with selective-transparency cover, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical write/read unit with selective-transparency cover will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1483686