JPH068919U - Rotary polygon mirror drive - Google Patents

Abstract

(57) [Abstract] [Purpose] In a rotary polygon mirror driving device, in order to improve the runout amount of the rotary polygon mirror mounting surface on the rotating member, it is possible to prevent machining scraps from remaining on the mounting surface when the rotary polygon mirror is mounted. Prevent an increase in the amount of trouble. [Structure] By providing at least one groove 17 radially from the rotating shaft 1 on the rotary polygon mirror mounting surface of the rotary member 4, it is possible to prevent machining scraps from remaining on the rotary polygon mirror mounting surface, and to reduce the amount of dynamic surface tilt. To reduce.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a rotary polygon mirror driving device used for laser scanning such as a laser beam printer.

[0002]

[Prior art]

 2. Description of the Related Art In recent years, polygon mirrors that rotate at high speed have been widely used as scanning means for laser beams such as laser beam printers and facsimiles. Since high image quality and high resolution are required for these devices, it is necessary to minimize the amount of dynamic surface tilt of the polygonal mirror during rotation.

FIG. 2 shows the configuration of a conventional rotary polygon mirror driving device. In FIG. 2, a magnet 2, a yoke 3, and a rotary member 4 for mounting a rotary polygon mirror are fixed to a rotary shaft 1, and a rotary polygon mirror 5 is fixed to the rotary member 4 via a spring 6 and a holding plate 7. It is attached with a retaining ring 8. A bearing 10 is fitted in the bracket 9, the rotary shaft 1 is rotatably supported, and a preload is applied by a preload spring 11, a washer 12, and a retaining ring 13. A winding 15 and a position detecting element 16 are attached to the printed board 14 and fixed to the bracket 9.

The operation of the rotary polygon mirror driving device configured as described above will be described. When an electric current flows through the winding 15, a driving force is generated between the winding 2 and the magnet 2, the rotating shaft 1 starts rotating, the rotating polygon mirror 5 rotates, and the laser beam (not shown) irradiated on the rotating polygon mirror surface. To scan. At this time, if the amount of dynamic surface tilt of the rotary polygon mirror 5 is large, the print image will have a light and shade, and the print quality will deteriorate. Usually, the rotating member 4 is rotated by external driving or self-driving, the surface on which the rotary polygon mirror 5 is mounted is cut or polished, and the amount of shake of the mounting surface is suppressed to reduce the amount of dynamic surface tilt.

[0005]

[Problems to be Solved by the Invention] However, in the above-described conventional configuration, processing scraps during cutting or polishing are likely to remain on the mounting surface, and the rotary polygon mirror may be mounted through the processing scraps. In addition, there is a problem that the amount of dynamic collapse is increased. The present invention solves the above-mentioned conventional problems, and an object thereof is to provide a rotary polygon mirror driving device in which no machining waste remains on the mounting surface when the rotary polygon mirror is attached and the amount of dynamic surface tilt is small. To do.

[0006]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention provides a rotary polygon mirror driving device in which at least one groove is provided radially on the rotary shaft on the surface of the rotary member on which the rotary polygon mirror is mounted. .

[0007]

[Action]

 Therefore, according to the present invention, the machining waste generated when machining the rotary polygon mirror mounting surface of the rotary member remains in the radial groove and does not remain on the mounting surface even if not all are discharged by centrifugal force during machining. Therefore, it is not necessary to attach the rotary polygon mirror through the processing scrap, and the amount of dynamic surface tilt is small and stable.

[0008]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. It should be noted that description of the same parts and the same configurations as those of the conventional example will be omitted. FIG. 1 shows the structure of a rotary polygon mirror driving device in one embodiment of the present invention. In FIG. 1, the difference from the configuration of the conventional example is that grooves 17 are radially provided on the surface of the rotary member 4 on which the rotary polygon mirror is mounted.

By providing the groove as described above, the rotary member 4 can be rotated by an external drive or a self drive, and when processing the mounting surface of the rotary polygon mirror, all the processing waste can be eliminated by centrifugal force during processing. Even if it does not exist, it will remain in the grooves radially provided and will not remain on the surface of the rotary polygon mirror to be mounted. Therefore, it is possible to prevent an increase in the amount of dynamic surface tilt due to the remains of machining waste when the rotary polygon mirror is mounted. There are no particular restrictions on the size, shape, depth, etc. of the grooves, and when two or more grooves are provided, they need not be arranged at equal intervals.

[0010]

[Effect of device]

 As is apparent from the above-described embodiment, the present invention prevents at least one machining groove on the mounting surface from moving by providing at least one groove radially on the rotating shaft on the surface of the rotary member on which the rotary polygon mirror is mounted. This has the effect of realizing a rotary polygon mirror drive device that does not increase the amount of surface tilt.

[Brief description of drawings]

FIG. 1 is a sectional view and a partially enlarged view of a rotary polygon mirror driving device according to an embodiment of the present invention.

FIG. 2 is a sectional view and a partially enlarged view of a conventional rotary polygon mirror driving device.

[Explanation of symbols]

1 ... Rotation axis, 2 ... Magnet, 3 ... Yoke, 4 ...
Rotating member, 5 ... Rotating polygon mirror, 6 ... Spring, 7 ... Holding plate, 8, 13 ... Retaining ring, 9 ... Bracket, 10 ... Bearing, 11 ... Preload spring, 12 ... Washer, 14 ... Printed circuit board, 15 ... Winding Line, 16 ... Position detection element, 17 ... Groove.

Claims (1)

[Scope of utility model registration request] 1. A rotary polygon mirror driving device, comprising: a rotary member to which a rotary polygon mirror is attached, wherein at least one groove is radially provided on a mounting surface of the rotary polygon mirror of the rotary member. .