JPH0521226U - Mirror angle adjustment device - Google Patents

Abstract

(57) [Abstract] [Purpose] A mirror angle adjusting device capable of firmly fixing a mirror holder without rattling, improving reliability, and performing smooth angle adjustment. provide. A mirror holder 23 for holding a mirror 19 and a base body for mounting the mirror holder are provided. The mirror holder 23 is provided with abutting portions 28, and both sides of the abutting portions 28 are screwed to the base body to project. The abutment portion 28 can be tilted, and the attachment angle of the mirror 19 can be adjusted by adjusting the angle of the mirror holder 23 with an adjusting screw provided at a position different from the screws on both sides of the abutment portion 28.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a mirror angle adjusting device that can be used, for example, in a synchronizing signal detecting optical system in an optical scanning device.

[0002]

[Prior Art]

 A mirror for bending the optical path is used in various optical systems, but it is necessary to use a device for adjusting the angle of the mirror in order to accurately guide the incident light to a predetermined position. FIG. 9 shows an example of a conventional mirror angle adjusting device. In FIG. 9, the mirror indicated by reference numeral 50 is attached to the surface of the mirror holder 51, and the adjusting screws 53, 54, and 55 are inserted through the three insertion holes formed in the mirror holder 51, respectively, and these adjustments are made. The mirror holder 51 is supported by the base 52 by screwing the screws 53, 54, 55 into the base 52. A coil spring is interposed between the base 52 and the mirror holder 51 around each adjusting screw 53, 54, 55, and the mirror holder 51 is separated from the base 52 by the elasticity of these coil springs. It is biased in the direction.

The adjusting screws 53 and 54 are arranged at a predetermined interval along one side edge of the mirror holder 51, and the adjusting screws 54 and 55 are arranged at a predetermined interval along the other side edge of the mirror holder 51. It is arranged with. The arrangement direction of the adjusting screws 53 and 54 and the arrangement direction of the adjusting screws 54 and 55 are orthogonal to each other. Therefore, for example, if the adjusting screw 53 is adjusted, the mirror holder 51 and the mirror 50 rotate centering on the line connecting the adjusting screws 54 and 55, and the inclination in the arrow a direction can be adjusted. If the adjustment is performed, the mirror holder 51 and the mirror 50 rotate with the line connecting the adjusting screws 53 and 54 as the center, and the tilt in the direction of the arrow b can be adjusted. Further, by adjusting the adjusting screw 54, it is possible to perform the adjustment in the direction in which the arrow a direction and the arrow b direction are combined.

[0004]

[Problems to be solved by the device]

 According to the above-mentioned conventional mirror angle adjusting device, the adjusting screws 53, 54, 55 are inserted through the insertion holes of the mirror holder 51, and the mirror holder 51 is separated by springs provided around the adjusting screws 53, 54, 55. Since the adjustment screws 53, 54, 55 are only pressed against the head, the mirror holder 51 cannot be firmly fixed, and the vibration causes the mirror holder to resonate or shift, which is unreliable. There was a difficulty.

The present invention has been made in order to solve the above-mentioned problems of the conventional technology, and can firmly fix the mirror holder without rattling and improving reliability. It is an object of the present invention to provide a mirror angle adjusting device capable of performing a smooth angle adjustment.

[0006]

[Means for Solving the Problems]

 The present invention has a mirror holder that holds a mirror and a base body to which the mirror holder is attached.The mirror holder is provided with abutting portions, and both sides of the abutting portions are screwed to the base body to secure the abutting portions. The feature is that it can be tilted as a fulcrum, and that the mounting angle of the mirror can be adjusted by adjusting the angle of the mirror holder with adjusting screws provided at positions different from the screws on both sides of the abutting part.

[0007]

[Action]

 By screwing both sides of the abutting portion of the mirror holder to the base body, the abutting portion comes into contact with the base body, and there is no rattling of the mirror holder. By adjusting the screws on both sides of the abutting portion, the mirror holder tilts about the abutting portion as a fulcrum, and the mirror angle can be adjusted in one direction. By adjusting the adjusting screws provided at positions different from the screws on both sides of the abutting part, the mirror holder tilts in the other direction with the abutting part as a fulcrum, and the mirror angle can be adjusted in the other direction.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A mirror angle adjusting device according to the present invention will be described below with reference to the drawings. The illustrated embodiment is a mirror angle adjusting device for a sync signal detecting optical system of an optical scanning device. Therefore, first, an example of the optical scanning device and its synchronizing signal detecting optical system will be schematically described.

In FIGS. 6 and 7, a laser light source 12 made of a semiconductor laser or the like is fixed to one side portion of a chassis 11 having a peripheral wall, and a cylindrical lens 13 is provided in a path of a laser beam emitted from the laser light source 12. And a polygon mirror 15 which is driven to rotate by a motor 14 is further arranged. The rotation of the polygon mirror 15 causes the laser beam from the laser light source 12 to be deflected within a certain angle range. The laser beam deflected by the polygon mirror 15 passes through the fθ lens 16 arranged in the vicinity of the polygon mirror 15, and is reflected by the first scanning reflection mirror 17 arranged at the upper edge of the chassis 11 in FIG. It As shown in FIG. 7, the first scanning reflection mirror 17 reflects the laser beam in a folded shape at an acute angle, and the reflected light is further used for the second scanning arranged on the inner bottom of the chassis 11. The reflection mirror 18 reflects the light toward the outside of the chassis 11.

As shown in FIG. 8, there is a photoconductor (not shown) or the like on the path of the light reflected by the second scanning reflection mirror 18, and the scanning line 21 is formed on the photoconductive surface of the photoconductor or the like. Draw. In FIG. 8, when the scanning direction of the scanning line 21 is from right to left as indicated by the arrow, a part of the beam reflected by the second scanning reflection mirror 18 is reflected to the right side which is the scanning start side. A mirror 19 is arranged for this purpose. A light receiving element 20 is arranged on the path of the reflected beam by the mirror 19. As shown in FIG. 6, the light receiving element 20 is fixed to the chassis 11 between the fθ lens 16 and the second reflection mirror 18 for scanning so as not to hinder the progress of the laser beam passing through the fθ lens 16. Has been done. In order to guide a part of the laser beam to the light receiving element 20, the mirror 19 is attached at a predetermined inclination angle as shown in FIG.

As can be seen from the positional relationship between the mirror 19, the light receiving element 20 and the second scanning reflection mirror 18 described above, the light receiving element 20 detects the scanning start position of the laser beam. Therefore, when a synchronization signal is generated after a certain time from the detection signal output by the light receiving element 20 and the laser light source 12 is started to be driven by the recording information signal in synchronization with this synchronization signal, the laser is generated according to the recording information signal. The beam is modulated to form a latent image on the photosensitive surface of the photoconductor.

As described above, since the mirror 19 is for guiding the laser beam to the light receiving element 20 for detecting the synchronizing signal, the tilt angle of the mirror 19 needs to be adjusted accurately, and the adjustment accuracy is high. If it is not good, the laser beam will not be correctly incident on the light receiving element 20, and the recorded information signal will be out of synchronization and an image will not be formed correctly. Therefore, in the illustrated embodiment, a mirror angle adjusting device for accurately adjusting the tilt angle of the mirror 19 is adopted. 1 to 5 show specific examples of the mirror angle adjusting device.

In FIGS. 1 to 5, the mirror 19 is mounted on the surface of the mirror holder 23. The mirror holder 23 has bent portions 24, 24 each having a surface in a direction orthogonal to each other at an outer edge portion. Two side surfaces of the mirror 19 which are perpendicular to each other are pressed against these bent portions 24 and 24, and two positioning projections 25 and 25 which are solid-implanted or projected on the mirror holder 23 make the mirror 19 orthogonal to each other. The mirror 19 is positioned at a predetermined position of the mirror holder 23 by positioning the other two side surfaces. Then, in this state, the mirror 19 is attached to the mirror holder 23 by adhering a plurality of places with an adhesive 26.

An abutting portion 28 is formed on the mirror holder 23 by bending one side edge portion thereof in the same direction as the bending portions 24, 24. Circular insertion holes 29, 29 are formed in the mirror holder 23 at the edge portion where the abutting portion 28 is formed and on both sides of the abutting portion 28. The abutting portion 28 is formed on a straight line connecting the centers of the insertion holes 29, 29. The mirror holder 23 also has an elongated hole 27 formed at a position different from the insertion holes 29 1, 29 2. With respect to the straight line connecting the centers of the two insertion holes 29, 29, the insertion holes 29, 29 and the elongated hole 27 are arranged so that the straight line connecting one of the insertion holes 29 and the center of the elongated hole 27 is orthogonal to each other. Are arranged.

The mirror holder 23 is attached to the base body 30. The base body 30 has screw holes at positions corresponding to the two insertion holes 29, 29 and the long hole 27 of the mirror holder 23, and the screws 31, 31 and 31 inserted into the two insertion holes 29, 29 are provided. The adjusting screws 32 inserted into the elongated holes 27 are respectively screwed into the screw holes of the base body 30. By screwing the two screws 31 and 31 into the base body 30, the tip of the abutting portion 28 of the mirror holder 23 abuts on the base body 30 as shown in FIG. 2, and as shown in FIG. By screwing 32 into the base 30, the mirror holder 23 is firmly attached to the base 30 without rattling. A leaf spring 33 is interposed between the base body 30 and the mirror holder 23 to urge the base body 30 and the mirror holder 23 in a direction to separate them from each other.

By adjusting the screws 31, 31 on both sides of the mirror holder 23 and the mirror 19 integrated therewith, the abutting portion 28 is in contact with the base body 30 by adjusting the screws 31, 31 on both sides thereof. The tilt angle of the mirror 19 in one direction can be adjusted by tilting the mirror 19 in the left-right direction. Since this adjustment is performed by abutting the abutting portion 28 on the base body 30 and using the abutting portion 28 as a fulcrum, the mirror holder 23 is firmly attached to the base body 30 even after the adjustment and the optical scanning unit vibrates. Even if it does, the mirror holder 23 does not resonate, and the detection output waveform of the light receiving element 20 does not fluctuate. Therefore, a highly reliable mirror angle adjusting device can be obtained.

Further, by adjusting the adjusting screw 32, the mirror holder 23 and the mirror 19 integrated with the mirror holder 23 with the abutting portion 28 as a fulcrum are moved in the left and right direction in FIG. 4, that is, the tilting direction of the mirror 19 by the screws 31 and 31. It is possible to adjust the tilt angle of the mirror 19 in the other direction by tilting the mirror 19 in a direction orthogonal to the direction. In this case, the leaf spring 33 also contributes to the tilt angle adjustment, but since the angle is adjusted with the abutting portion 28 of the mirror holder 23 abutting on the base body 30 as a fulcrum, the mirror spring is also adjusted. The holder 23 is firmly attached to the base body 30 without rattling, and a highly reliable mirror angle adjusting device can be obtained.

After adjusting the inclination in each direction in this way, as shown in FIG. 4, an adhesive 35 is applied between the screws 31 and 32 and the base body 30, and the screws 31 and 32 and the mirror holder are attached. It is preferable to apply an adhesive 36 between the mirror holder 23 and the base 23 to more firmly and surely integrate the mirror holder 23 and the base body 30.

According to the illustrated embodiment, in addition to the above-described effects, the abutting portion 28 formed on the straight line connecting the centers of the pair of screws 31 and 31 is used as a fulcrum to support the screw 31. , 31 to adjust the angle in one direction, and similarly, using the butting portion 28 as a fulcrum to adjust the adjusting screw 32, the angle in the other direction orthogonal to the one direction can be adjusted. Therefore, the angle adjustment in one direction and the angle adjustment in the other direction orthogonal to this can be separated and independently performed, and the angle adjustment in one direction affects the adjustment in the other direction. It also has the advantage of facilitating mirror angle adjustment.

The mirror angle adjusting device according to the present invention is applicable not only to the optical scanning device as shown in the drawing but also to any optical device.

[0021]

[Effect of the device]

 According to the present invention, since the abutting portion formed on the mirror holder is abutted against the base body, the angle of the mirror can be adjusted by using this abutting portion as a fulcrum. It is possible to obtain a highly reliable mirror angle adjusting device that is firmly mounted without rattling due to vibration.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of a mirror angle adjusting device according to the present invention, excluding a base.

FIG. 2 is a left side view showing the same embodiment with a base added.

FIG. 3 is a rear view of the same.

FIG. 4 is a plan view of the same.

FIG. 5 is a front view of the same.

FIG. 6 is a plan view showing an example of an optical scanning device to which the mirror angle adjusting device is applied.

FIG. 7 is a sectional side view of the same.

FIG. 8 is a perspective view showing an arrangement relationship between a mirror and a light receiving element of the optical scanning device.

FIG. 9 is a perspective view showing an example of a conventional mirror angle adjusting device.

[Explanation of symbols]

 19 mirror 20 light receiving element 23 mirror holder 28 abutting portion 30 base 31 screw 32 adjusting screw

Claims (1)

[Scope of utility model registration request] 1. A device for adjusting a mounting angle of a mirror for reflecting a part of a laser beam to guide it to a light receiving element, comprising a mirror holder for holding the mirror and a base body for mounting the mirror holder. The mirror holder is provided with an abutting part, and both sides of the abutting part are screwed to the base body to allow tilting with the abutting part as a fulcrum. A mirror angle adjusting device that can adjust the mounting angle of the mirror by adjusting the angle of the mirror holder with the adjusting screw.