# US 5,351,264 A · Optical apparatus for emitting light and automatic adjustment apparatus therefor

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- Number: US 5,351,264 A
- Document ID: US5351264A
- Status: Granted
- Kind: A
- Application number: 08/016,288
- Filed: 1993-02-11
- Granted: 1994-09-27
- Earliest claimed: 1992-02-14
- Assignees: Canon Kabushiki Kaisha
- Inventors: Masatoshi Kato; Yozo Tobo; Fumio Ichikawa; Jun Azuma; Hideaki Uemura
- Web page: https://patentgrep.com/patent/US5351264A

## CPC

- G11B 7/22: Apparatus or processes for the manufacture of optical heads, e.g. assembly
- G11B 7/125: Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces
- 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 apparatus (23) for emitting light is constituted by a fixation holder (8) fixed to a predetermined positioning fixation jig via a fixation plate (8a), a lens-barrel (10), fitted on a cylindrical portion of the fixation holder (8) via an annular gap (19), and formed of a transparent material, for holding a collimator lens (2), and a semi-conductor laser light source (1) fitted under pressure in the fixation holder (8). An ultraviolet curing adhesive (18) is uniformly filled in the gap (19). Before the ultraviolet curing adhesive (18) is cured, the lens-barrel (10) is movable in an optical axis direction (Z) and in two-dimensional directions (directions of arrows X and Y) on a plane perpendicular to the optical axis direction (Z) with respect to the fixation holder (8).

## Claims

### Claim 1

An optical apparatus for emitting light, comprising:
a holder on which a semi-conductor laser light source is mounted; and
a lens-barrel in which a collimator lens for collimating a laser light emitted from the semi-conductor laser light source is mounted,
wherein said holder and said lens-barrel are fixed by adhering after a relative position therebetween has been adjusted spatially.

### Claim 2

An optical apparatus for emitting light, comprising:
a semi-conductor laser light source;
a fixation holder for holding said semi-conductor laser light source;
a collimator lens for collimating a laser beam emitted from said semi-conductor laser light source; and
a lens-barrel being a substantially hollow member formed of a transparent material, for incorporating and holding said collimator lens, having collars on an outer surface thereof, being formed with slits extending in an optical axis direction on a portion opposite to said collimator lens with respect to said collars, and being fitted onto said fixation holder via a predetermined gap at the portion where the slits are formed so that said lens-barrel is movable in the optical axis direction and in two-dimensional directions on a plane perpendicular to the optical axis direction,
wherein said lens-barrel is positioned and fixed to said fixation holder by curing an adhesive filled in the gap in the fitting portion between said lens-barrel and said fixation holder.

### Claim 3 (depends on 2)

An apparatus according to claim 2, wherein said lens-barrel and the portion of said fixation holder onto which said lens-barrel is fitted, each have a substantially cylindrical shape.

### Claim 4 (depends on 2, 3)

An automatic adjustment apparatus for adjusting focusing and irradiating positions of an optical apparatus according to claim 2 or 3, comprising:
positioning fixation means for positioning and fixing said fixation holder;
clamp means for holding said collars of said lens-barrel;
a three-dimensional positioning mechanism, mounting said clamp means, for moving and positioning said lens-barrel held by said clamp means in the optical axis direction and in two-dimensional directions on a plane perpendicular to the optical axis direction;
first position detection means for detecting a coarse irradiating position in the two-dimensional directions of a laser beam transmitted through said collimator lens;
second position detection means for detecting an outer diameter and a central position in the two-dimensional directions of the laser beam transmitted through said collimator lens;
control means for determining based on the input irradiating position detected by said first position detection means whether the irradiating position is located within a specified range or not, for controlling said three-dimensional positioning mechanism so as to move said lens-barrel to a position where said second position detection means detects that the outer diameter and the central position in the two-dimensional directions of the laser beam are respectively a minimum value and a proper position if the irradiating position falls within the specified range, and controlling said three-dimensional positioning mechanism so as to move said lens-barrel to a position where the irradiating position falls within the specified range if the irradiating position falls outside the specified range, thereafter, controlling said three-dimensional positioning mechanism so as to move said lens-barrel to the position where said second position detection means detects that the outer diameter and the central position in the two-dimensional directions of the laser beam are respectively a minimum value and a proper position; and
an ultraviolet ray radiating device for curing the adhesive after said positioning.

### Claim 5 (depends on 2, 3)

An automatic adjustment apparatus for adjusting focusing and irradiating positions of an optical apparatus according to claim 2 or 3, comprising:
positioning fixation means for positioning and fixing said fixation holder;
clamp means for holding said collars of said lens-barrel;
a three-dimensional positioning mechanism, mounting said clamp means, for moving and positioning said lens-barrel held by said clamp means in the optical axis direction and in two-dimensional directions on a plane perpendicular to the optical axis direction;
first position detection means for detecting a coarse irradiating position in the two-dimensional directions of a laser beam transmitted through said collimator lens;
second position detection means for detecting a peak value of a light amount and a central position in the two-dimensional directions of the laser beam transmitted through said collimator lens;
control means for determining based on the input irradiating position detected by said first position detection means whether the irradiating position is located within a specified range or not, for controlling said three-dimensional positioning mechanism so as to move said lens-barrel to a position where said second position detection means detects that the peak value of the light amount and the central position in the two-dimensional directions of the laser beam are respectively a maximum value and a proper position if the irradiating position falls within the specified range, and controlling said three-dimensional positioning mechanism so as to move said lens-barrel to a position where the irradiating position falls within the specified range if the irradiating position falls outside the specified range, thereafter, controlling said three-dimensional positioning mechanism so as to move said lens-barrel to the position where said second position detection means detects that the peak value of the light amount and the central position in the two-dimensional directions of the laser beam are respectively a maximum value and a proper position; and
an ultraviolet ray radiating device for curing the adhesive after said positioning.