# US 5,710,672 A · Assembly for positioning the component parts of a laser detector grating unit (LDGU)

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 5,710,672 A
- Document ID: US5710672A
- Status: Granted
- Kind: A
- Application number: 08/723,177
- Filed: 1996-09-30
- Granted: 1998-01-20
- Earliest claimed: 1996-09-30
- Assignees: Eastman Kodak Company
- Inventors: David Anthony Roberts; John Charles Brazas, Jr.
- Web page: https://patentgrep.com/patent/US5710672A

## CPC

- G11B 7/22: Apparatus or processes for the manufacture of optical heads, e.g. assembly
- G11B 7/123: Integrated head arrangements, e.g. with source and detectors mounted on the same substrate
- 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

An optical system includes an LDGU having a grating beam splitter and an optical source with an effective aperture for generating a radiation beam to be applied to a data track of an optical storage medium, a detector array and a micro-lens. An LDGU mounting structure includes: a baseplate having a plurality of clearance holes and defining a registration groove; a plurality of contact pins which are aligned in the clearance holes of the baseplate; and a pedestal defining a plurality of surfaces for mounting the optical source, the detector array and the micro-lens. The mounting structure further includes: a cover including a transparent window fixedly secured to the baseplate to form a hermetic seal; and a grating support barrel for mounting the grating beam splitter which is aligned to the registration groove in the baseplate and which has an opening and a plurality of registration surfaces defined on its uppermost surface.

## Claims

### Claim 1

In an optical system including an LDGU having a grating beam splitter and an optical source with an effective aperture for generating a radiation beam to be applied to a data track of an optical storage medium, a detector array and a micro-lens, LDGU(Laser-Detector-Grating Unit) mounting means comprising:
a) a baseplate having a plurality of clearance holes and defining a registration groove;
b) a plurality of contact pins which are aligned in the clearance holes of the baseplate;
c) a pedestal defining a plurality of surfaces for mounting the optical source, the detector array and the micro-lens;
d) a cover including a transparent window fixedly secured to the baseplate to form a hermetic seal; and
e) a grating support barrel for mounting the grating beam splitter which is aligned to the registration groove in the baseplate and which has an opening and a plurality of registration surfaces defined on its uppermost surface.

### Claim 2 (depends on 1)

The invention of claim 1 further including fastening means which secure through selected ones of the clearance holes the LDGU to the optical system.