# US 5,347,415 A · Head height adjustment method including a synchronized rotating laser beam optical axis

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- Number: US 5,347,415 A
- Document ID: US5347415A
- Status: Granted
- Kind: A
- Application number: 08/044,775
- Filed: 1993-04-12
- Granted: 1994-09-13
- Earliest claimed: 1992-04-15
- Assignees: Matsushita Electric Industrial Co., Ltd.
- Inventors: Akio Murata; Takaaki Maegawa; Hideaki Mukae; Masaru Higashionji
- Web page: https://patentgrep.com/patent/US5347415A

## CPC

- G11B 5/53: Disposition or mounting of heads on rotating support
- 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 a magnetic recording and/or reproducing apparatus, it is necessary to adjust the height of each of a plurality of magnetic heads carried by a rotary cylinder for movement together therewith. This adjustment is accomplished by rotating an optical axis of a laser beam emitted from a laser oscillator in synchronism with the rotary cylinder so that the optical axis is always maintained stationary relative to the magnetic head. The laser beam is subsequently irradiated to a head base in the proximity of a head chip secured to the head base, thereby adjusting the head height during rotation of the rotary cylinder.

## Claims

### Claim 1

A method of adjusting the height of a magnetic head secured to a head base accommodated in a rotary cylinder, said method comprising the steps of:
rotating an optical axis of a laser beam in synchronism with the rotary cylinder so that the optical axis is always maintained stationary relative to the magnetic head; and
irradiating the laser beam to a portion of the head base in the proximity of a head chip secured to the head base, thereby adjusting the head height during rotation of the rotary cylinder.

### Claim 2 (depends on 1)

The method according to claim 1, wherein the optical axis of the laser beam passes through the center of a hollow motor.