Optical head with astigmatic reflecting element

Details Optical head with astigmatic reflecting element Optical head with astigmatic reflecting element

1988-03-17

1989-09-26

Richardson, Robert L.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 45, 369 46, 250201, G11B 700

Patent

active

048706329

ABSTRACT:
An optical head for reproducing optical recording medium (6) has reflection optical means, such as, a reflection type astigmatic optical Fresnel lens (7A, 7B) or reflection type light-beam dividing (into at least two beams) Fresnel lens (13), grating (18) or prism (19), on or above a surface of a beam splitter (4), so that reflect return light from the optical recording medium (6) travels in the beam splitter 4 to photo-detector means (8, 15) having at least two divided parts (8A, 8B, 8C, 8D or 15A, 15B, 15C, 15D); thereby size of the optical head is reduced by setting the optical path from the reflection optical means to the photo-detector inside the beam splitter (4).

REFERENCES:
patent: 4441175 (1984-04-01), Shuman
Hatakoshi et al, "Astigmatic Grating Lens", Extended Abstracts (The Autumn Meeting, 1983); The Japan Society of Applied Physics 26P-S-5.
Hatakoshi et al: "Manufacturing of and Experiment on Focus Detection Grating Lens", Extended Abstracts (The Spring Meeting, 1984); The Japan Society of Applied Physics 30a-K-1.
Okazaki: "Optical Pick-up with Reduced number of Components"; O plus E, 3/1986.

Affiliated with

Also associated with

Rating

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-192811