JP2945183B2 - Deflection scanning device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deflection scanning device such as a laser beam printer using a rotating device supported by a ball bearing or the like.

[0002]

2. Description of the Related Art Conventionally, a precision ball bearing is used in a rotating device for performing high-speed or high-precision rotation, particularly in a laser beam printer or the like.

FIG. 5 shows a conventional example of a deflection scanning device of a laser beam printer. A flange 2 is press-fitted into the rotating shaft 1, a polygon mirror 3 is mounted on the flange 2, and a yoke 4 is fixed below the flange 2. Further, a driving magnet 5 is fixed to the inner surface of the yoke 4, and a driving motor is configured together with the stator coil 6 installed facing the driving magnet 5, and the rotating polygon mirror 3 is driven to rotate via the rotating shaft 1. The rotating shaft 1 is fitted into an inner ring of a ball bearing 8 pressed into a housing 7, and the housing 7 is fixed to an optical box 10 by screws 9.

[0004]

However, in the above-mentioned conventional example, since the screw 9 is used to fix the housing 7 to the optical box 10, the screw 9 is used so as not to hinder the rotation of the yoke 4. Are arranged outside the yoke 4. Accordingly, the size of the housing 7 increases, which causes an increase in weight or cost. Further, since 4 to 5 screws 9 are usually used, the number of parts, the number of steps, or the cost increases.

SUMMARY OF THE INVENTION An object of the present invention is to provide a lightweight and inexpensive deflection scanner by solving the above-mentioned problems and reducing the size of the housing by eliminating the use of screws.

[0006]

According to the present invention, there is provided a deflection scanning apparatus, comprising: a deflector for rotating a driving motor supported by a bearing to deflect and scan a light beam; In a deflection scanning device in which a unit for condensing light on a body is accommodated in an accommodation container, a housing of the drive motor is fixed to the accommodation container via an elastic member.

[0007]

In the deflection scanning device having the above-described structure, a housing containing a ball bearing is arranged in an optical box, and an elastic member is fitted into a recess provided below the housing to fix the housing and the optical box.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to the embodiments shown in FIGS. FIG. 1 is a sectional view showing the first embodiment. A flange 12 is press-fitted into the rotating shaft 11, and a rotary polygon mirror 13 as an example of a deflector is mounted on the flange 12, and a yoke 14 is fixed below the flange 12. Further, the driving magnet 1 is provided on the inner surface of the yoke 14.
5 is fixed, and the stator coil 16 placed below is mounted.
And a drive motor. Furthermore, the rotating shaft 1
1 is a ball bearing 1 press-fitted into a housing 17.
8 is fitted into the inner ring.

Usually, a metal member such as brass is used for the housing 17, and an upper flange 17a and a lower flange 17b are integrally formed. The housing 17 is fitted into a hole of the optical box 19, and a compression coil spring 20 is interposed between the optical box 19 and the lower part.

The compression coil spring 20 is provided on the lower flange 1.
7b is pressed in the direction A, the lower surface of the upper flange 17a is pressed against the optical box 19, and the housing 17 is fixed to the optical box 19. The outer diameter of the upper flange 17a and the lower flange 17b may be slightly larger than the body diameter B of the housing 17.

As described above, in this embodiment, the compression coil spring 20 is used to fix the housing 17 to the optical box 19.
Is used, the need for screwing is eliminated, and the housing 17 can be reduced in size, weight, or cost. Also, the number of parts and the number of steps can be reduced.

FIG. 2 is a sectional view showing a second embodiment.
Instead of the compression coil spring 20 of the first embodiment described above, a resilient sleeve 21 made of resin or rubber is used, and a certain degree of compression is applied between the optical box 19 and the lower flange 17b. Attached to. Sleeve 21
Presses the lower flange 17b in the direction A as in the first embodiment, so that the housing 17 is pressed and fixed to the optical box 19.

FIG. 3 is a sectional view showing a third embodiment.
An elastic projection 22 is formed integrally with the optical box 19 on the lower surface of the optical box 19 made of a mold. When the housing 17 is fixed to the optical box 19, the projections 22 bend while opening outward and press the lower flange 17b in the direction A while returning, so that the housing 17 is pressed and fixed to the optical box 19. .

In this embodiment, the same effects as those of the first and second embodiments can be obtained, and the elastic members such as the compression coil spring 20 and the sleeve 21 used in the previous embodiment can be omitted. Therefore, further cost reduction can be achieved.

FIG. 4 is a sectional view showing a fourth embodiment, and shows the lower flange 17b of the first to third embodiments.
Instead, the lower part of the housing 17 is molded integrally with the housing 17 and has a resilient foot 2.
3 are provided.

In this case, the elastic leg 23 bends,
Since these feet 23 press the housing 17 in the direction A,
The housing 17 is fixed to the optical box 19.

[0017]

As described above, in the deflection scanning device according to the present invention, as means for fixing the housing to the optical box,
Since an elastic member is used instead of the screw, the size of the housing can be reduced, the weight and the number of parts can be reduced, and the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a first embodiment.

FIG. 2 is a sectional view of a second embodiment.

FIG. 3 is a sectional view of a third embodiment.

FIG. 4 is a sectional view of a fourth embodiment.

FIG. 5 is a sectional view of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Rotation axis 13 Rotating polygon mirror 17 Housing 17a Upper flange 17b Lower flange 19 Optical box 20 Compression coil spring 21 Sleeve 22 Projection 23 Foot

Claims (6)

(57) [Claims] 1. A by the drive motor is supported by a bearing
A deflector for deflecting and scanning the rotating and the light beam, a light beam in the deflection scanning device to be accommodated in container and means for focusing onto the scanned object, the housing through an elastic member to the housing of the drive motor A deflection scanning device fixed to a container. 2. A deflection scanning apparatus according to claim 1 which is fixed to the container by member <br/> elastic member for supporting the bearing of the drive motor. 3. The deflection scanning device according to claim 1, wherein the elastic member is a coil spring. 4. The deflection scanning device according to claim 1, wherein the elastic member is formed of resin or rubber. 5. The deflection scanning device according to claim 1, wherein the elastic member is formed integrally with the container. 6. The deflection scanning device according to claim 1, wherein the elastic member is provided outside the storage container.