Focus detector which serves to split off a portion of a detected

Details Focus detector which serves to split off a portion of a detected Focus detector which serves to split off a portion of a detected

1991-10-16

1993-07-27

Young, W. R.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

2502015, 369 4442, 369112, G11B 7095

Patent

active

052316211

ABSTRACT:
The present invention is directed to a focus detector, one embodiment of which includes a light source, a collimator lens, a beam splitter and an objective lens. The light emitted by the light source is collimated by the collimator lens and subsequently passed through the beam splitter. The objective lens focuses the light passing through the beam splitter on a rotating disk. The light reflected by the disk passes through the beam splitter and is directed to a sensor lens. The sensor lens directs the light beam to an optical element arranged in a light path adjacent a refocus point of the light beam. The optical element is so arranged that the light beam is split only when it is not refocused at the expected refocus point.

REFERENCES:
patent: 3953863 (1976-04-01), Lang
patent: 3997715 (1976-12-01), Elliott
patent: 4079248 (1978-03-01), Lehureau et al.
patent: 4083056 (1978-04-01), Nakamura et al.
patent: 4533826 (1985-08-01), van Alem
patent: 4631397 (1986-12-01), Ohsato et al.
patent: 4654839 (1987-03-01), Endo
patent: 4660955 (1987-04-01), Ishida et al.
patent: 4670869 (1987-06-01), Chen
patent: 4682315 (1987-07-01), Uejima
patent: 4682316 (1987-07-01), Tateoka et al.
patent: 4683559 (1987-07-01), Emoto et al.
patent: 4694443 (1987-09-01), Ando
patent: 4701604 (1987-10-01), Ando
patent: 4705941 (1987-11-01), Yamada et al.

Affiliated with

Also associated with

Rating

Focus detector which serves to split off a portion of a detected does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Focus detector which serves to split off a portion of a detected, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Focus detector which serves to split off a portion of a detected will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2347256