JPH0590428U - Optical scanning device - Google Patents

Abstract

(57) [Abstract] [Purpose] The reflection mirror can be mounted without increasing the number of parts or the number of assembly steps, and does not require high mounting accuracy.
Further, an optical scanning device capable of simplifying the position adjustment work is provided. [Structure] A reflection mirror 15 that reflects a laser beam B for detecting a writing start position and guides it to a photo sensor 17 is attached to a substrate 18 on which a light source 12 and a control circuit 1201 for the light source 12 are mounted, and the substrate 18 is attached. Housing 1 with screws 30
1 is attached to the side wall portion 1110, and a light transmitting hole 1111 is provided in the side wall portion 1110 where the reflection mirror 15 faces. Then, in the head portion 21 of the adjusting screw 20 screwed to the side wall portion 1110, the driver insertion hole 180 of the substrate 18 is formed.
3 parts are pressed into contact, and the driver insertion hole 1803 part is the head part 2 of the adjusting screw 20 to the side wall part 1110.
The side wall portion 111 of the housing 11
It is configured to approach and separate from the 0 side.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an optical scanning device used in a laser beam printer or the like.

[0002]

[Prior Art]

 In some optical scanning devices used for laser beam printers, the light beam output from the light source and scanned and deflected by the optical deflector is reflected by the reflection mirror and is incident on the photosensor for writing position detection. There is something I did. In the conventional optical scanning device, a holding member or a holding member is used to mount the reflection mirror in the housing, and at this time, in order to make the optical path of the light beam reflected by the reflection mirror accurate, The mirror is attached to the housing with high accuracy, or the reflecting mirror is attached to the housing through a mechanism for adjusting the position so that the optical path can be adjusted.

[0003]

[Problems to be solved by the device]

 As described above, in the past, since a separate member such as a holding member and a holding member was required for mounting the reflection mirror, there was a problem that the number of parts and the number of assembling steps increased and the device cost increased. Also, when the reflection mirror is mounted on the housing with high mounting accuracy, the assembling work becomes complicated, and when the reflection mirror is mounted on the housing through a mechanism for position adjustment, the reflection mirror is normally housed in the housing. However, there was a problem that the housing had to be opened and the work performed each time the position was adjusted.

The present invention has been made in view of the above problems, and an object thereof is to provide an optical scanning device in which a reflection mirror can be attached without increasing the number of parts or the number of assembling steps. It is an object of the present invention to provide an optical scanning device that can simplify the position adjustment work without requiring the above.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention provides a housing, an optical deflector provided in the housing, a light source for outputting a light beam toward the optical deflector, and the housing provided with the light source and the light source. In an optical scanning device including a substrate on which a light source control circuit is mounted and a reflection mirror that reflects the scanning-polarized light beam, the reflection mirror is provided on the substrate. Further, according to the present invention, the substrate is attached to the outside of the housing so that the position of the substrate can be adjusted, and the housing is provided with a light transmitting hole for transmitting a light beam.

[0006]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory diagram showing a schematic configuration of an optical scanning device according to a first embodiment of the present invention. In this embodiment, a case where the optical scanning device is used in a laser beam printer will be described.

In FIG. 1, reference numeral 10 denotes an optical scanning device, and a housing 11 thereof houses a polygon mirror 13 as an optical deflector, an fθ lens 14, and a correction lens 16.

A substrate 18 is screwed to the outer surface of the side wall portion 1110 of the housing 11, and a light source 12 that outputs a laser beam toward a polygon mirror 13 and a light emission of the light source 12 are controlled on the substrate 18. And a control circuit 1201 for controlling. Further, a light transmission hole 1111 is formed in the side wall portion 1110 of the housing 11, and a reflection mirror 15 made of glass is adhered to the substrate 18 at a portion facing the light transmission hole 1111 as shown in FIG. It is attached by the agent 1501.

In FIG. 1, reference numeral 17 is a photosensor for detecting the writing start position, 19 is a substrate screwed to the outer surface of the side wall portion 1120 of the housing 11, and the substrate 19 includes the photosensor 17 and the photosensor 17. A signal output circuit (not shown) that outputs a detection signal when the photo sensor 17 detects light is mounted. Further, a light transmission hole 1121 is formed in the side wall portion 1120 where the photo sensor 17 faces.

Next, the operation of the optical scanning device 10 of this embodiment having such a configuration will be described. The laser light output from the light source 12 is a laser light for drawing which is modulated based on print information input to a control circuit (not shown), and is output prior to the laser light for drawing. There is a laser beam for detecting the writing start position, and the laser beam output for drawing is scanned and deflected by the polygon mirror 13 and then focused by the fθ lens 14 to irradiate a photosensitive drum (not shown). ..

On the other hand, the laser beam B output for detecting the writing start position is focused on the fθ lens 14 after being scan-deflected by the polygon mirror 13, and is an enlarged perspective view of a main part of the optical scanning device 10 of FIG. 1. As shown in FIG. 3, the light is transmitted through the light transmission hole 1111 provided in the side wall portion 1110 of the housing 11 to irradiate the reflection mirror 15. As shown in FIG. 3, the laser beam B reflected by the reflection mirror 15 is transmitted through the light transmission hole 1111 again, and is transmitted through the light transmission hole 1121 after the correction lens 16 corrects the optical path in the vertical direction. The photo sensor 17 is irradiated.

As described above, in the optical scanning device 10 of this embodiment, the light source 12 and its control circuit 1201 are mounted on the reflection mirror 15 that reflects the laser beam B for detecting the writing position and guides it to the photosensor 17. Since it is attached to the substrate 18 with the adhesive agent 1501, the member for attaching the reflection mirror 15 can be eliminated, and the number of parts and the number of assembling steps can be reduced.

Next, a second embodiment of the present invention will be described. FIG. 4 is an explanatory view showing a schematic structure of an optical scanning device according to a second embodiment of the present invention, and FIGS. 5 and 6 are enlarged perspective views of a main part of the optical scanning device of the second embodiment shown in FIG. 4 to 5, the same elements as those of FIGS. 1 and 3 are designated by the same reference numerals as those of FIGS. 1 and 3, and the description thereof will be omitted.

Then, in the optical scanning device 10 of the second embodiment, as shown in FIG. 5, a protrusion 1112 is provided on the outer surface of the side wall portion 1110 of the housing 11. As shown in FIG. 5, the surface 1112A of the protrusion 1112 facing the substrate 18 is an inclined surface having a short projection length from the side wall portion 1110 at the upper end portion and a long projection length at the lower end portion. Is provided with a screw hole 1113 into which the mounting screw 30 is screwed. An adjusting screw 20 is screwed on the side wall portion 1110 above the protrusion 1112. On the other hand, a through hole 1801 through which the mounting screw 30 is inserted is provided in the base plate 18 facing the screw hole 1113, and the base plate 18 where the head 21 of the adjusting screw 20 faces is provided with the adjusting screw. A driver insertion hole 1803 having a diameter smaller than that of the head portion 21 of 20 is provided.

Therefore, the mounting screw 30 is inserted into the through hole 1801 of the substrate 18 and screwed into the screw hole 1113 on the housing 11 side, and the substrate 18 is attached to the side wall of the protrusion 1112 of the housing 11 as shown in FIG. When attached to the portion 1110, the driver insertion hole 1803 portion of the substrate 18 faces the head portion 21 of the adjusting screw 20 screwed on the side wall portion 1110 above the protrusion 1112. Therefore, the plus groove 22 formed in the head portion 21 of the adjusting screw 20 faces the driver insertion hole 1803, and the tip of the driver (not shown) inserted in the driver insertion hole 1803 can be engaged with the plus groove 22. Becomes

In the optical scanning device 10 of the present embodiment having such a configuration, as in the first embodiment, the laser light B output for detecting the writing position is scan-deflected by the polygon mirror 13 and the fθ lens. After being focused at 14, the light is transmitted through the light transmission hole 1111 and is irradiated on the reflection mirror 15. As shown in FIG. 3, the laser beam B reflected by the reflection mirror 15 passes through the light transmission hole 1111 again, and after the optical path is corrected by the correction lens 16, passes through the light transmission hole 1121 and passes through the photo sensor 17. Is irradiated.

Here, the board 18 is pressed against the surface 1112A of the projection 1112 by tightening the mounting screw 30, and the driver insertion hole 1803 portion of the board 18 faces the head 21 of the adjustment screw 20. Therefore, the orientation of the substrate 18 at the portion where the reflection mirror 15 is attached with respect to the side wall portion 1110 of the housing changes depending on the tightening and loosening of the adjusting screw 20 and the mounting screw 30.

Therefore, the mounting screw 30 is sufficiently tightened, and the adjusting screw 20 is tightened by a driver (not shown) inserted in the driver inserting hole 1803 of the substrate 18, and the adjusting screw 20 is attached to the side wall portion 1110 of the housing 11. When it is completely screwed in, the driver insertion hole 1803 portion of the substrate 18 is pressed against the head portion 21 of the adjusting screw 20 and approaches the side wall portion 1110 side. Then, as shown in FIG. 7, the portion of the substrate 18 to which the reflection mirror 15 is attached tilts downward with respect to the side wall portion 1110 of the housing 11. Therefore, when the reflection mirror 15 is irradiated with the laser light B in the state of FIG. 7, the optical path of the laser light B reflected by the reflection mirror 15 is changed to the optical path of the laser light B irradiated on the reflection mirror 15. Is lower in the horizontal direction.

Further, when the tightening of the adjusting screw 20 is loosened from the state shown in FIG. 7 with a driver (not shown), the protruding length of the adjusting screw 20 from the side wall portion 1110 becomes long, and the head portion 21 of the adjusting screw 20 is increased. Is applied to the driver insertion hole 1803 portion, so that the distance between the substrate 18 of the driver insertion hole 1803 portion and the side wall portion 1110 of the housing 11 increases. Therefore, as shown in FIG. 8, the protrusion length from the side wall portion 1110 of the adjusting screw 20 is adjusted so that the substrate 18 and the reflection mirror 15 attached thereto are substantially parallel to the side wall portion 1110 of the housing 11. And the degree of tightening of the mounting screw 30 are adjusted appropriately, the optical path of the laser light B reflected by the reflection mirror 15 becomes the same in the horizontal direction as the optical path of the laser light B irradiated on the reflection mirror 15. Become.

Then, the adjusting screw 20 and the mounting screw 30 are further loosened from the state shown in FIG. 8 with a driver (not shown), and the protruding length of the adjusting screw 20 from the side wall portion 1110 is determined from the side wall portion 1110 of the protrusion 11 12. If the projection length is longer than the projection length, the portion of the substrate 18 to which the reflection mirror 15 is attached tilts upward with respect to the side wall portion 1110 of the housing 11 as shown in FIG. Therefore, in the state of FIG. 9, the optical path of the laser light B reflected by the reflection mirror 15 is higher than the optical path of the laser light B incident on the reflection mirror 15 in the horizontal direction.

As described above, in the optical scanning device 10 of the present embodiment, the driver insertion hole 1803 portion of the base plate 18 to which the reflection mirror 15 is attached changes the position of the head 21 of the adjusting screw 20. Since the configuration is such that the housing 11 is moved toward and away from the side wall portion 1110 of the housing 11, the optical path of the laser light B reflected by the reflection mirror 15 can be adjusted upward and downward. Therefore, it is not necessary to increase the mounting accuracy of the reflection mirror 15 and the substrate 11 to which the reflection mirror 15 is attached to the housing 11, and the correction lens 16 used in the first embodiment can be omitted.

Further, in the optical scanning device 10 of this embodiment, the substrate 18 is attached to the outer surface of the side wall portion 1110, and the plus groove 22 formed in the head 21 of the adjusting screw 20 is inserted into the driver of the substrate 18. Since it is configured to face the use hole 1803, the position adjustment work of the reflection mirror 15 can be performed from the outside of the housing 11 by using a driver (not shown). Therefore, when adjusting the optical path of the laser beam B reflected by the reflection mirror 15, the position adjustment work of the reflection mirror 15 can be performed without opening the housing 11, and the work can be simplified.

In the second embodiment described above, the configuration for adjusting the optical path of the laser beam B reflected by the reflection mirror 15 in the horizontal direction has been described, but the present invention is not limited to this. For example, the arrangement of the adjusting screw 20 and the mounting screw 30 on the substrate 18 is arranged along the scanning direction of the optical beam B, and the inclination of the reflection mirror 15 in the scanning direction of the laser beam B can be adjusted to reflect the reflection. The optical path of the laser light B reflected by the mirror 15 may be adjusted in the scanning direction.

Further, in the above-mentioned first and second embodiments, the reflection mirror 15 made of glass is attached to the substrate 18 by the adhesive 1501, but the present invention is not limited to this. For example, as shown in FIG. 10, the reflection mirror 15 may be formed on the pattern portion 1805 of the substrate 18 by vapor deposition, or as shown in FIG. 11, a copper foil 1807 for pattern formation on the substrate 18 may be used. The reflection mirror 15 may be formed. Further, when the reflection mirror 15 is made of metal, the reflection mirror 15 may be attached to the substrate 18 with solder 1503 as shown in FIG.

[0025]

[Effect of the device]

 As described above, according to the present invention, a light source, a substrate on which a control circuit for the light source is mounted, and an optical deflector for scanning and deflecting a light beam output from the light source are provided in a housing. In the scanning device, since the reflection mirror that reflects the light beam scanned and deflected by the light deflector is provided on the substrate, the light source and the reflection mirror can be unitized to simplify the configuration. Also, since the work of mounting on the housing and the work of adjusting the mounting position can be performed at the same time as the light source etc., the man-hours for assembly and adjustment work can be reduced, and the number of parts is reduced by eliminating the mounting member dedicated to the reflecting mirror. be able to. Further, according to the present invention, the substrate is attached to the outside of the housing so that the position of the substrate can be adjusted, and the housing is provided with a light transmitting hole for transmitting a light beam. The optical path of the generated light beam can be adjusted by adjusting the position of the substrate, and it is possible to eliminate the need for increasing the accuracy of mounting the reflection mirror. Furthermore, this allows the position adjustment work of the reflection mirror to adjust the optical path of the light beam reflected by the reflection mirror to be performed from the outside of the housing, eliminating the need to open the housing each time the adjustment work is performed. Can be simplified.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a schematic configuration of an optical scanning device according to a first embodiment of the present invention.

FIG. 2 is an enlarged perspective view of an essential part of a substrate showing a mounting state of the reflection mirror shown in FIG.

FIG. 3 is an enlarged perspective view of a main part of the optical scanning device in FIG.

FIG. 4 is an explanatory diagram showing a schematic configuration of an optical scanning device according to a second embodiment of the present invention.

5 is an enlarged perspective view of a main part of the optical scanning device of FIG.

6 is an enlarged perspective view of a main part of the optical scanning device of FIG.

7 is an explanatory diagram showing a position adjustment state of a substrate in the optical scanning device of FIG.

8 is an explanatory diagram showing a position adjustment state of a substrate in the optical scanning device of FIG.

9 is an explanatory diagram showing a position adjustment state of a substrate in the optical scanning device of FIG.

10 is an enlarged perspective view of an essential part of the substrate, showing another mounting state of the reflection mirror shown in FIGS. 1 and 4. FIG.

11 is an enlarged perspective view of a main part of the substrate, showing another mounting state of the reflection mirror shown in FIGS. 1 and 4. FIG.

12 is an enlarged perspective view of an essential part of the substrate, showing another mounting state of the reflection mirror shown in FIGS. 1 and 4. FIG.

[Explanation of symbols]

 10 Optical Scanning Device 11 Housing 1111 Light Transmission Hole 12 Light Source 1201 Control Circuit 13 Optical Deflector 15 Reflecting Mirror 18 Substrate B Light Beam

Claims (2)

[Scope of utility model registration request] 1. A housing, an optical deflector provided in the housing, a light source for outputting a light beam toward the optical deflector, a light source provided in the housing, and a control circuit for controlling the light source. An optical scanning device comprising: a mounted substrate; and a reflection mirror that reflects the scanning-deflected light beam, wherein the reflection mirror is provided on the substrate. 2. The optical scanning device according to claim 1, wherein the substrate is attached to the outside of the housing so that the position of the substrate can be adjusted, and the housing has a light transmission hole for transmitting a light beam.