# US 5,350,917 A · Opto-magnetic recording polarization optical apparatus including a laser diode and a light absorbing film

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- Number: US 5,350,917 A
- Document ID: US5350917A
- Status: Granted
- Kind: A
- Application number: 07/996,149
- Filed: 1992-12-23
- Granted: 1994-09-27
- Earliest claimed: 1991-12-27
- Assignees: Sony Corporation
- Inventors: Tadashi Taniguchi; Chiaki Kojima
- Web page: https://patentgrep.com/patent/US5350917A

## CPC

- G11B 7/1381: Non-lens elements for altering the properties of the beam, e.g. knife edges, slits, filters or stops (G11B7/1353 - G11B7/1369 take precedence)
- G11B 7/123: Integrated head arrangements, e.g. with source and detectors mounted on the same substrate
- G11B 11/10543: {using optical beam of radiation}
- G11B 11/10595: {Control of operating function}
- G11B 7/0912: {by push-pull method}
- G11B: INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER (recording measured values in a way that does not require playback through a transducer G01D9/00; recording or playback apparatus using mechanically marked tape, e.g. punched paper tape, or using unit records, e.g. punched or magnetically marked cards G06K; transferring data from one type of record carrier to another G06K1/18; circuits for coupling output of reproducer to radio receiver H04B1/20; gramophone pick-ups or like acoustic electromechanical transducers or circuits therefor H04R)

## Abstract

In an optical apparatus according to the present invention, a light-absorbing film is formed between a light-receiving element and an optical semitransparent film formed on the light-receiving element to cause the light-receiving element to partially receive incident light. In addition, in an optomagnetic recording polarization optical apparatus according to the present invention, a prism for guiding a reflected light component from an optomagnetic recording medium to a light-receiving element and the light-receiving element are arranged on the same substrate.

## Claims

### Claim 1

An optical apparatus comprising a structure in which a plurality of light-receiving elements are mounted on a substrate, a prism mounted on said plurality of light-receiving elements, and an optical semitransparent film mounted between said light-receiving elements and said prism, and
a light-absorbing film mounted between said light-receiving element and said optical semitransparent film.

### Claim 2

An optical apparatus comprising a structure in which a plurality of light-receiving elements are mounted on a substrate, a prism mounted on said plurality of light-receiving elements with an adhesive layer, an optical semitransparent film and
a light-absorbing film mounted between said light-receiving element and said optical semitransparent film.

### Claim 3

An optical apparatus comprising a structure in which a plurality of light-receiving elements are mounted on a substrate, a prism mounted on said plurality of light-receiving elements with an adhesive layer, an optical semitransparent film mounted between at least one of said light-receiving elements and said prism, and
said adhesive layer which is interposed between said light-receiving elements and said optical semitransparent film is light absorbent.

### Claim 4 (depends on 3)

An apparatus according to claim 3,
wherein said adhesive layer which is interposed between said light-receiving elements and said optical semitransparent film contains a dye capable of absorbing light.