JPS6252513A - Laser optical device - Google Patents

Abstract

PURPOSE:To adjust spot parallel light and perform its maintenance easily and securely by providing a spring member which is energized in an optical-axis direction and a small eccentric screw radially between the 1st and the 2nd cylindrical members and adjusting and holding the position relation between a laser light source and a collimator lens. CONSTITUTION:A screw hole 114 for the small eccentric screw 16 is bored in the 1st cylindrical member 11 and a groove 143 which engages the diameter part of a projection 162 is made in the 2nd cylindrical member 14. The slot 163 of the head of the small eccentric screw 16 is turned by using a screwdriver to adjust the gap between the laser light source and collimator lens CL within a range 2XDELTAH. In this adjustment, the clearance between the groove 143 and the projection 162 of the small eccentric screw 16 and the fitting play between the screw hole 114 and the thread part 161 of the small eccentric screw 16 are absorbed by the spring member 15. Thus, the adjustment is made stably with high precision.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a laser optical device used in a laser copying machine and the like that performs electrostatic recording by scanning laser light, and in particular uses a laser semiconductor element as a light source and uses a collimator lens to obtain a spot of light. The present invention relates to an improvement of a laser optical device as described above.

[Conventional technology]

A laser semiconductor light-emitting device emits laser light in a completely destroyed form from its PN junction, so a collimator lens is installed in front of it to create a spot-like parallel laser beam, and then it is transmitted through a cylindrical lens, an f-theta lens, a polygon, etc. Recording is performed on a photoreceptor by obtaining a scanning laser beam. If the laser beam is not completely parallelized by the collimator lens, the light will gradually spread and the photoreceptor will not be scanned by the pre-designed spot light, resulting in the characters and images being formed. Significantly lower quality. The relative position between the laser light source and the collimator lens needs to be within an adjustment range of several microns. Conventionally, for example, the adjustment and adjustment between the laser light source and the collimator lens was performed as shown in Figure 3.
It was maintained. That is, a male screw 31A is provided on the inside of the cylinder 31 that holds the laser semiconductor packageno LP that is a light source, and a male screw 32A is provided on the outside of the cylinder 3 that holds the collimator lens CL.
The cylinder 32 is rotated, and the gap between the laser light source LP and the collimator lens rcL is adjusted using this threaded part. Then, once the adjustment has been made, the set screw 33 operates in the radial direction.
was screwed in from the side to fix the relative positions of the cylinders 31 and 32.

[Problems to be solved by the invention]

The relative position of the conventional laser light source and collimator lens shown in FIG. 3 is W4! !・The way to hold it is that there is play in the screw fittings of the threaded parts 31A and 32A to be adjusted, making it difficult to make delicate adjustments, and even if it is properly adjusted, it is necessary to fix it with the set screw 33 first. There was a problem in that it would move when the set screw 33 was tightened from the 14-fold position. The present invention aims to provide a laser optical system in which the relative position 111g between the laser light source and the collimator lens is easily and delicately set, and no deviation from the adjusted position occurs even when the adjustment is completed and fixed. purpose.

[Means to solve the problem]

The above purpose is to provide a first support for the laser semiconductor package.
The cylindrical member and the second cylindrical member supporting the collimator lens are fitted together, and a spring member biased in the optical axis direction and an eccentric machine screw in the radial direction are inserted between the first cylindrical member and the m2 cylindrical member. This is achieved by a laser optical device characterized in that the laser light source and the collimator lens are arranged in such a way that the relative position between the laser light source and the collimator lens is adjusted and maintained.

【Example】

FIG. 1(a) is a cross-sectional view showing one embodiment of the present invention. A laser semiconductor element housed in a metal package emits laser light from its PN junction. In order to improve heat dissipation, a step part of the package of the laser semiconductor packageno LP is fastened at the rear end position on the central axis of the first cylindrical member 11 made of metal or the like with good thermal conductivity using a locking ring 12 having a threaded part. The attachment is fixed. Further, the first cylindrical member 11 has its outer edge portion 111 mounted on the main body mounting frame 20,
It is attached to the main body by a nut 21. On the other hand, the lens frame 13 to which the colliterator lens CL is fixed by caulking or the like is fixed by screws, adhesive, etc. so that the lens optical axis is on the central axis of the second cylindrical member 14. The point of this embodiment is that the relative position between the laser semiconductor banquet LP having a light emitting part fixed to the first cylindrical member 11 attached to the main body and the collimator lens CL fixed to the second cylindrical member 14 is The positional relationship between the first cylindrical member 11 and the second cylindrical member 14 is replaced, and the adjustment and holding thereof can be performed accurately and fixed without going out of order after adjustment. The inner diameter 112 of the first cylindrical member 11 and the outer diameter 141 of the second cylindrical member 14 are in a slidably fitted state. In addition, a stepped portion 113 provided on the inner surface of the first cylindrical member 11 and a step portion 113 provided on the inner surface of the first cylindrical member 11
A helical spring member 15 biased in the direction of the optical axis is provided at the opening between the stepped portion 142 provided on the outer surface of the lens 4. Furthermore, an eccentric machine screw 16 having an axis in the radial direction is engaged between the first cylindrical member 11 and the second cylindrical member 14, and the eccentric machine screw 16 is a screw provided on the circumferential surface of the head. There is a protrusion 162 that protrudes eccentrically at the portion 161 and the tip. As shown in FIG. 1(b), the eccentric machine screw 16 is a machine screw that is centered on its axis and has an eccentricity of ΔH. Eccentricity ΔH absorbs errors such as variations in the position of the light source from the designed value in each lens, mechanical component, and laser semiconductor bacceno LP, and is set, for example, between 0.1 and 0.51. The first circle frB member 11 has a screw hole 1 for an eccentric machine screw 16.
14 is provided, and the m2 cylindrical member 14 is provided with a protrusion 162.
A groove 143 is provided to fit the diameter of the laser light source and the collimator lens C.
The distance from L is adjusted within the range of 2×ΔH. In this adjustment, the groove 143 and the protrusion 162 of the eccentric machine screw 16 should be adjusted, and the screw hole 114 and the threaded part 16 of the eccentric machine screw 16 should be adjusted.
The fitting play of No. 1 is absorbed by the biased spring member 15, allowing stable and highly accurate adjustment. Furthermore, in this embodiment, tJS1 yen #1 yen phase 1 member 1
A groove 115 for applying adhesive is provided in 1 hole 114,
Similarly, since the through hole portion 116 is provided in the first cylindrical member 11 so that the adhesive can be injected between the first cylindrical member 11 and the second cylindrical member 14, the groove By injecting adhesive into the holes 115 and 116, the adjusted state can be maintained as is. #S2 figure shows an example of a laser copying machine using the laser optical device shown in vS1 figure. Laser optical device 1 according to the present invention, in which the laser light source and collimator lens are adjusted and held as one unit. After passing through a cylindrical lens 2 for illumination adjustment, the spot parallel light is reflected by a reflecting mirror 3, and is converted into a scanning light by a regular polygon 4 that rotates at a constant speed in one direction. fθ lens 5 so that scanning is performed at the scanning speed.
After the correction is performed, characters and images are formed by scanning on an electrophotographic photoreceptor (not shown) which is positioned below and moves by a reflecting mirror 6. In the laser copying machine shown in FIG.
! Arrangements will be made. Although the embodiment shown in FIG. 1 has been described above, the present invention is not limited thereto. It is also possible to configure it so that it is inscribed in , and is included in the present invention. Furthermore, regarding the adhesive used in the laser beam marking device of the present invention, it is not necessarily limited to instant adhesive. It is used. [Effects of the Invention] As explained above, in the laser beam marking device according to the present invention, the y! 4 adjustment and its maintenance can be done easily and reliably, so when applied to the laser optical system shown in Fig. 2, for example, it can be easily adjusted with a screwdriver, and by appropriately setting the eccentricity △H, the driver The position where the best parallel laser beam can be obtained within the rotation angle can be determined, and by injecting the adhesive at that position, the best conditions can now be maintained.6

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of the present invention.
) is a side sectional view, and FIG. 1(b) shows an eccentric screw portion. FIG. 2 shows an example of a laser optical system to which the present invention is applied. FIG. 3 is a sectional view showing the prior art. 11...First circle #1 member 12...Stop ring 1
3... Lens frame 14... Second cylindrical member 15.
... Spring member 16 ... Eccentricity screw LP ... Laser semiconductor package CL ... Cylindrical lens ΔH ... Eccentricity Applicant Konishiroku Photo Industry Co., Ltd. Figure 2

Claims (1)

[Claims] a first cylindrical member supporting a laser semiconductor package;
A second cylindrical member supporting the collimator lens is fitted, and a spring member biased in the optical axis direction and an eccentric machine screw in the radial direction are provided between the first cylindrical member and the second cylindrical member,
Adjust the relative position between the laser light source and the collimator lens.
A laser optical device characterized in that the laser optical device is adapted to be held.