JP2503482B2 - Rotating polygon mirror device polygon mirror support device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary polygon mirror device of a laser recording device for recording information contained in a laser beam as a hard copy, and particularly to a polygon mirror of this polygon mirror device. The present invention relates to a supporting device that supports a.

[Conventional technology]

Generally, in a laser recording device (for example, a laser printer or a digital copying machine) that records information contained in a laser beam as a hard copy, a device that deflects the laser beam containing information to a photoconductor and performs main scanning on the photoconductor surface. A rotary polygon mirror device is used as the device.

Such a rotary polygon mirror device 1 has a plurality of (six) reflecting surfaces 3a for the laser light 2 formed on the peripheral surface thereof, as shown in the top view of FIG. 5 and the sectional view of the main part of FIG. The polygonal mirror 3 has a flat regular hexagonal shape, and a motor 4 for rotating the polygonal mirror 3 at high speed.

By the way, in the laser recording apparatus using the rotary polygon mirror device 1, the polygon mirror 3 must be rotated at a high speed in order to achieve high-speed output of information. Therefore, the motor 4 for rotating the polygon mirror 3 is usually 10000 to It is rotating at a specific speed between 40,000 rpm. On the other hand, the polygon mirror 3 rotates while the laser beam 2
Since the polygon mirror 3 is reflected and deflected, when the polygonal mirror 3 vibrates during rotation or the mounting position is displaced, the traveling direction of the reflected light with respect to the incident light is largely changed, which makes it impossible to record information accurately. . Therefore, conventionally, as shown in FIGS. 5 and 6, the polygon mirror 3 is attached to the polygon mirror mounting device 5
It is attached to the rotary shaft 6 of the motor 4 via. The polygonal mirror mounting device 5 is composed of a disk-shaped flange 7 and a disk-shaped leaf spring 8 that function as a flywheel, and the flange 7 fixed to the rotary shaft 6 of the motor 4 and the rotary shaft 6 are provided. The polygonal mirror 3 is held between the disk-shaped leaf spring 8 whose center is supported by the tip 6a, thereby preventing vibration and displacement of the polygonal mirror 3 due to high-speed rotation of the polygonal mirror 3. . A groove 7b having a rectangular cross section is formed along the circumferential direction of the upper surface 7a of the flange 7, and an appropriate amount of the weight 10 is provided in the groove 7b by using a jig such as tweezers 9. Insert it and fix it, which allows the polygon mirror 3
The delicate wheel balance associated with the high-speed rotation of the polygon mirror 3 is ensured, and the more stable rotation of the polygon mirror 3 is maintained.
In the conventional mounting device 5 shown in FIGS. 5 and 6, the disc-shaped leaf spring 8 is prevented from coming off from the rotating shaft 6,
The pressing force on the polygonal mirror 3 is generated by a removable snap ring 11 fitted in a groove 6b formed at the tip of the rotary shaft 6. Further, in another conventional supporting device 12 shown in FIGS. 7 and 8, a tongue piece 8b formed at the center of the disk-shaped leaf spring 8 is fitted and engaged in the groove 6b of the rotary shaft 6, The leaf spring 8 is prevented from coming off and a pressing force is generated.

[Problems to be solved by the invention]

By the way, in the rotary polygon mirror device 1, it is necessary to mount the polygon mirror 3 without damaging the polygon mirror 3. However, according to the above-mentioned conventional polygon mirror mounting devices 5 and 12, the reflection surface 3a of the polygon mirror 3 is Since the groove 7b for balancing the wheel of the rotating system is formed immediately below the front, when using a jig such as tweezers 9 to attach the weight 10 to the groove 7b to balance the wheel, The tool may contact the reflecting surface 3a of the polygon mirror 3 and damage the polygon mirror 3. Also,
Since the groove 7b is formed on the upper surface 7a of the flange 7 by machining, there is a problem that the machining cost is high and the rotary polygon mirror device 1 itself is expensive.

[Means and Actions for Solving Problems]

In view of the above-mentioned problems, the present invention provides a polygon mirror that deflects laser light containing information between an upper surface of a flange fixed to a rotation shaft of a motor and a leaf spring supported by the rotation shaft of the motor. In a polygon mirror support device for a rotary polygon mirror device, a plate-shaped plate integrally formed with a rising portion for attaching a weight for rotation system balance adjustment to an outer peripheral edge of the plate spring, and the motor. It is composed of a tongue piece that presses against the upper surface of the polygon mirror when it is supported by the rotation axis of the polygon mirror, and a weight is attached to the inner peripheral surface of the rising portion from above the polygon mirror using a jig to rotate the polygon mirror. The rotation system balance adjustment work of the polygon mirror device is executed so that the jig is not positioned in front of the reflection surface during the rotation system balance adjustment work.

〔Example〕

An embodiment of the polygon mirror mounting device according to the present invention will be described in detail below.

1 and 2 are a top view and a sectional view of a main part of a rotary polygon mirror apparatus 1 to which a polygon mirror mounting apparatus 20 according to the present invention is applied, and the same portions as those in FIGS. .

The polygon mirror attaching device 20 of the rotary polygon mirror device 1 is
As shown in the figure, a disk-shaped flange 21 fixed to the rotary shaft 6 of the motor 4 and a disk-shaped leaf spring 22 supported by the tip 6a of the rotary shaft 6 located on the upper surface 21a side of the flange 21. The polygonal mirror 3 has a hole formed at the center thereof inserted into the small diameter portion 21a of the flange 21,
It is held between the flange portion 21 and the leaf spring 22. Of these, the leaf spring 22 is composed of a disc-shaped plate 22a, and a rising portion 22b is integrally formed on the outer peripheral edge of the plate 22a along the circumferential direction. Also,
On the plate surface 22c of the plate 22a, three tongue pieces 22d are radially integrally formed by punching such as pressing (FIG. 1). The tongue piece 22d is the upper surface 3b of the polygon mirror 3.
It is bent toward the (Fig. 2) side, and when it is fixed to the rotary shaft 6 of the motor 4, it comes into pressure contact with the upper surface 3b of the polygon mirror 3. In the embodiment shown in FIGS. 1 and 2, the leaf spring 22 is fixed to the tip of the rotary shaft 6 via the screw 23 and the spacer 24 as shown in FIG. Has been done. As described above, when the polygonal mirror 3 is fixed to the rotary shaft 6 while being gradually tightened by the screw 23, the upper surface 3a of the polygonal mirror 3 is not accidentally damaged when the polygonal mirror 3 is attached.

Next, the operation of the polygon mirror support device 22 described above will be described, and the configuration will be described in more detail.

Rotating polygon mirror device 1 having the polygon mirror supporting device 22 described above
When adjusting the delicate wheel balance of, use a jig such as tweezers 9 to attach the weight 10 to the rising portion 22 of the leaf spring 22.
It adheres to the inner peripheral surface of b (Fig. 1). In this way leaf spring 22
When attaching the weight 10 to the rising portion 22b of the polygonal mirror 3, the tweezers 9 may be moved above the polygonal mirror 3, so that the tip of the tweezers 9 is not located in front of the anti-slope 3a of the polygonal mirror 3. , Therefore the tweezers 9 and the reflecting surface of the polygon mirror 3
There is almost no risk of contact with 3a.

In the above embodiment, the leaf spring 22 is replaced with the screw 23 and the spacer.
The leaf spring 22 is easily attached to and detached from the rotary shaft 6 of the motor 4 via the shaft 24 and the rotary shaft 6 of the motor 4, but the present invention is not limited to the above embodiment. No. 3, the same parts as in FIGS. 1 and 2 are designated by the same reference numerals.
As shown in the top view of the figure and the sectional view of FIG.
A plurality of tongue pieces 22e (FIG. 3) punched out at the center of the plate 22a are fixed to the plate spring 22 without using the screw 23 and the spacer 24, and the groove 6b formed at the tip 6a of the rotary shaft 6 is formed. The leaf spring 22 may be fixed to the rotary shaft 6 by being fitted and engaged with (FIG. 4).

〔The invention's effect〕

According to the invention, since the rising portion for attaching the weight for adjusting the wheel balance of the rotation system is formed on the leaf spring of the polygon mirror supporting device for supporting the polygon mirror, when performing the wheel balance adjustment work, Since a jig such as tweezers is not located in front of the polygonal mirror reflecting surface, it is possible to reduce the possibility that the reflecting surface of the polygonal mirror is damaged. Further, since the rising portion to which the weight for adjusting the wheel balance of the rotating system is attached is integrally formed with the leaf spring by press molding or the like, the processing cost is low, and therefore the rotary polygon mirror device can be provided at low cost. You can also

[Brief description of drawings]

1 and 2 show an embodiment of a polygonal mirror support device according to the present invention, a top view and a sectional view, FIG. 3 and FIG.
FIG. 7 is a top view and a sectional view of a polygon mirror supporting device showing another embodiment, FIGS. 5 and 6 are top views and sectional views showing a conventional polygon mirror supporting device, and FIGS. It is a top view and a sectional view showing another polygon mirror support device. 1 ... Rotating polygon mirror device, 2 ... Laser light, 3 ... Polygon mirror, 4 ... Motor, 6 ... Rotation axis, 10 ... Weight, 20 ... Polyhedral support device, 21 ... Flange, 22 ...... Leaf spring, 22b ...
… Rise part, 22c …… plate surface, 22d …… tongue piece.

Claims (1)

(57) [Claims] 1. A polygon mirror for deflecting laser light containing information is held between an upper surface of a disk-shaped flange fixed to a rotation shaft of a motor and a leaf spring supported by the rotation shaft of the motor. In the polygon mirror supporting device of the rotary polygon mirror device, the leaf spring is a disk-shaped plate integrally formed with a rising portion for attaching a weight for rotation system balance adjustment to an outer peripheral edge, and a plate of the plate. Formed integrally with the surface,
A polygonal mirror supporting device for a rotary polygonal mirror device, comprising: a tongue piece that is pressed against the upper surface of the polygonal mirror when being supported by the rotating shaft of the motor.