Error detecting device for optical head

Details Error detecting device for optical head Error detecting device for optical head

1989-03-23

1993-03-16

Envall, Jr., Roy N.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4414, 369 4441, 369112, G11B 7085

Patent

active

051950723

ABSTRACT:
An error detecting device for an optical head detects a focussing error and a tracking error. The error detection device includes an optical structure for converting a reflected light of a light irradiating a surface to be irradiated into an astigmatic pencil of rays having a first focal point and a second focal point, the optical structure having a first focussing member for focussing the reflected light on the first focal point of the astigmatic pencil of rays, and a second focussing member for focussing the reflected light on the second focal point of the astigmatic pencil of rays, the first and the second focussing members being made integral, and a device for detecting errors of the light irradiating the surface to be irradiated, based on a detecting signal of a spot of the reflected light formed by the first focussing member, and a detecting signal of a spot of said reflected light formed by the second focussing member. The error detecting device can be small-sized and light, have a small astigmatic difference, easily to align optical elements.

REFERENCES:
patent: 4817074 (1989-03-01), Yamanaca
patent: 4895790 (1990-01-01), Swanson et al.
Patent Abstracts of Japan, vol. 9, No. 239 (P-391) (1962) Aug. 25, 1985, and JP-A-60 93643 (Toshiba K.K.) May 25, 1985.
Patent Abstracts of Japan, vol. 8, No. 129 (P-280) (1566) Jun. 15, 1984, and JP-A-59 33637 (Mitsubishi Denki K.K.) Feb. 23, 1984.

Affiliated with

Also associated with

Rating

Error detecting device for optical head does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Error detecting device for optical head, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Error detecting device for optical head will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-356007