JPH1158829A - Laser beam source apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily adjust the pitch interval of spot beams on a photosensitive member. SOLUTION: A laser unit 30 is constituted of a semiconductor laser beam source 31, an iris 32, a holder 33 and a mirror cylinder 35 having a collimation lens 34 built therein. The iris 32 is fixed to the laser beam source 31 with respect to two beam emitting points of the semiconductor laser beam source 31 by an adhesive or the like so that the longitudinal direction of the aperture thereof becomes a predetermined angle. The mirror cylinder 35 is moved to predetermined positions in three directions of XYZ with respect to the holder 33 before bonded.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laser light source device used for optical writing in a laser printer, a digital copying machine or the like.

[0002]

2. Description of the Related Art In this type of conventional laser light source device,
For example, as shown in a perspective view of FIG. 4 and a cross-sectional view of FIG. 5, a semiconductor laser light source 2 having a plurality of light emitting points is used for a laser unit 1, and XYZ 3 is inserted into a fitting hole 4 provided in a holder 3. After the positioning in the direction is performed, it is fixed to the holder 3 by bonding or the like. The lens barrel 5 attached to the holder 3 contains a collimator lens 6 and a diaphragm 7 having a rectangular opening.

As shown in FIG. 6, when fixing a laser unit 1 to an optical box 10 containing optical components such as an fθ lens 8 and a rotary polygon mirror 9, as shown in FIG. In order to adjust the two spots S on the body to a predetermined pitch D in the sub-scanning direction, it is necessary to perform rotation adjustment in the AA ′ direction shown in FIG.

[0004] For example, the pitch interval D has a resolution of 600 DP.
About 42 μm in I (dot / inch), 1200DP
In I, it is necessary to adjust a very fine pitch interval of about 21 μm to about ± several μm.

[0005] The holder 3 is inserted into the mounting hole 11 of the optical box 10, and the optical box 1 is inserted through a long hole 14 provided in the holder 3.
After the male screw 15 is screwed into the female screw hole 9 provided in the housing 0, the male screw 15 is temporarily fixed, the holder 3 is rotationally adjusted in the AA 'direction, and then the male screw 15 is tightened to fix the laser unit 1 to the optical box 10. I do.

[0006]

However, in the above-mentioned conventional example, when the semiconductor laser light source 2 is fixed to the holder 3, if it is fixed casually, a rotational position error of about several degrees occurs. In this state, the aperture 7 having a rectangular opening is three-dimensionally adjusted in the XYZ directions with respect to the semiconductor laser light source 2, so that the rotational position error of the aperture 7 with respect to the laser light source 2 is not eliminated. Also, in the rotation adjustment of the laser unit 1, which is the adjustment of the pitch interval D in the sub-scanning direction, only the two light emitting points of the semiconductor laser light source 2 are adjusted to be at a predetermined angle θ with respect to the main scanning direction. However, the rotational position error of the diaphragm 7 is still not eliminated.

Therefore, the laser unit 1 is fixed to the optical box 10 while the stop 7 contains a rotational position error of about several degrees with respect to the main scanning direction, so that the spot diameter is rotated. And a good spot shape cannot be obtained, and a high quality image cannot be obtained.

An object of the present invention is to solve the above-mentioned problems,
An object of the present invention is to provide a laser light source device in which a pitch interval can be easily adjusted.

[0009]

A laser light source device according to the present invention for achieving the above object has a semiconductor laser light source having a plurality of light emitting points, a holder for holding the semiconductor laser light source, and a light emitting device. In a laser light source device comprising a collimator lens that converts a beam into substantially parallel light, an aperture having a rectangular opening for narrowing a beam to a plurality of light emitting point positions of the semiconductor laser light source is attached to the semiconductor laser light source at a predetermined angle. It is characterized by having done.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to the embodiments shown in FIGS. FIG. 1 is an exploded perspective view of the embodiment. A laser unit 30 includes a semiconductor laser light source 31, an aperture 32, a holder 33, and a collimator lens 34.
Is constructed from a lens barrel 35 having a built-in lens barrel. As shown in FIG. 2, two light emitting points 31 of the semiconductor laser light source 31
The aperture 32 is fixed to the laser light source 31 by an adhesive or the like so that the longitudinal direction of the aperture of the aperture 32 is at a predetermined angle θ with respect to a and 31b. At this time, the light emitting point 31a,
For the method 31b, a method of observing with a microscope or a magnifying glass and moving the stop 32 to a predetermined position is used.

Then, the semiconductor laser light source 31 is
2 and is fixed to the holder 33 by bonding or press-fitting. The lens barrel 35 is attached to the holder 33 by XYZ 3.
After being moved to a predetermined position in the direction, it is adhered.

When the laser unit 30 thus adjusted is mounted on the optical box 40, the fitting provided on the holder 33 is inserted into the fitting hole 41 provided on the optical box 40 as shown in FIG. The joint 36 is fitted.

The sub-scanning pitch is adjusted by rotating the laser unit 30 in the BB 'direction with respect to the optical box 41. For this rotation adjustment, the male screw 42 is loosely screwed into the female screw hole 43 provided in the optical box 40 via the fixing hole 37 provided in the holder 33 at a large size.
A rotation adjustment pin 51 provided on a rotation adjustment jig 50 is fitted into a rotation adjustment hole 38 provided on the holder 33,
The rotation adjustment jig 50 is rotated to perform the adjustment.

The rotation in the direction BB 'is adjusted so that the two light emitting points 31a and 31b of the semiconductor laser light source 31 are at a predetermined angle with respect to the main scanning direction of a scanning lens (not shown). In this case, the diameter of the fixing hole 37 is 4
Since it is formed larger than 2, the holder 33 can be slightly rotated. When the pitch corresponding to the DPI of the predetermined resolution is reached, the rotation adjustment is completed and the male screw 4
2 is tightened to fix the holder 33 to the optical box 40.

In the embodiment, the stop 32 is fixed to the semiconductor laser light source 31 as a separate member by a method such as bonding, but the stop 32 itself is formed on the cover glass of the semiconductor laser light source 31 by printing, vapor deposition, or the like. May be.
The same effect can be obtained even if the opening of the cap of the semiconductor laser light source 32 has an aperture shape.

[0016]

As described above, in the laser light source device according to the present invention, since the semiconductor laser light source and the stop are integrated, when the semiconductor laser light source is fixed to the holder, press-fitting can be performed without concern for the rotation angle with respect to the stop. Adhesion is possible, and subsequent two adjustments of three-dimensional adjustment of the semiconductor laser light source and the collimator lens in the XYZ directions and rotation adjustment as adjustment of the sub-scanning pitch of the laser unit can be performed by the same simple method as in the past.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of an embodiment.

FIG. 2 is a diagram showing a positional relationship between a semiconductor laser light source and an aperture.

FIG. 3 is an exploded perspective view when attached to an optical box.

FIG. 4 is a perspective view of a conventional laser unit.

FIG. 5 is a sectional view.

FIG. 6 is a perspective view of a conventional laser scanning device.

FIG. 7 is an explanatory diagram of a sub-scanning interval of a spot.

[Explanation of symbols]

 Reference Signs List 30 laser unit 31 semiconductor laser light source 32 aperture 33 holder 34 collimator lens 35 lens barrel 36 fitting portion 37 fixing hole 38 rotation adjusting hole 40 optical box 41 fitting hole 42 male screw 43 female screw hole 50 rotation adjusting jig

Claims (2)

[Claims] 1. A laser light source device comprising: a semiconductor laser light source having a plurality of light emitting points; a holder for holding the semiconductor laser light source; and a collimator lens for making the emitted beam substantially parallel light. A laser light source device, wherein an aperture having a rectangular aperture for narrowing a beam to a plurality of light emitting point positions is attached to the semiconductor laser light source at a predetermined angle. 2. The laser light source device according to claim 1, wherein said aperture also serves as a cover glass of said semiconductor laser light source.