JPH0557502A - Polygon mirror machining device - Google Patents

Abstract

PURPOSE:To provide a polygon mirror machining device in which runout and dislocation of a machining jig fitted with a cutting tool is not caused while it is turned, and in which the machining accuracy of the polygon mirror surface is not reduced by vibration. CONSTITUTION:A machining jig 2 to which a cutting tool 1 has been fitted is integrally constructed with the moving element of an ultrasonic motor, and the surface of a polygon mirror 8 is machined by turning the vibrator 3 of the ultrasonic motor.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polygon mirror machining apparatus for machining the surface of a mirror by rotating a machining jig equipped with a cutting tool in the process of machining a cylindrical polygon mirror.

[0002]

2. Description of the Related Art A conventional cylindrical polygon mirror machining apparatus employs a method of machining the surface of a polygon mirror by rotating a machining jig having a cutting tool such as a diamond cutter attached thereto by a spindle. The configuration of the processing jig and the processing process in this case will be described with reference to FIGS. In FIG. 3, 1 is a cutting tool, 5 is a jig body, and 7 is a spindle. Here, these are collectively referred to as a processing jig. This processing jig is installed in the processing apparatus main body 9 as shown in FIG. 4, and rotates the cutting tool 1 together with the spindle at, for example, several hundreds of revolutions per minute to process the surface of the polygon mirror 8 supported by the holder 6. The jig main body may be a rod type as shown in FIGS. 3 and 4 or a disc type 10 as shown in FIG. 5, but both have the same function.

[0003]

However, when the polygon mirror is processed with the above configuration, the following problems occur. In order to achieve the required cutting speed in machining and due to problems with the weight of the spindle, the radius of the spindle is the turning radius of the cutting tool, that is, the length of the jig body in the case of a rod jig, and the length of the jig body in the case of a disc jig. Is a small fraction of the radius of the disk. For this reason, when a shake or displacement occurs at the center of rotation during rotation, the amount of the shake or displacement is amplified at the cutting tool position, which reduces machining accuracy.

Further, in order to reduce the torque required to rotate the processing jig, it is necessary to reduce the total weight of the processing jig as much as possible. However, since the weight of the spindle itself cannot be changed significantly, the jig main body must be made lighter, which lowers the rigidity of the jig main body and causes vibration during rotation, which lowers the machining accuracy.

In view of the above circumstances, according to the present invention, the processing accuracy of the surface of the polygon mirror is not deteriorated because the processing jig attached with the cutting tool is shaken or displaced during rotation, or vibrates. An object is to provide a mirror processing device.

[0006]

Means for Solving the Problems The technical means of the present invention for solving the above-mentioned problems is characterized in that a machining jig having a cutting tool attached thereto is rotated by an ultrasonic motor.

[0007]

The function of this technical means is as follows.
The jig main body for processing is integrated with the moving element of the disk type ultrasonic motor, and the cutting tool is attached to the outer periphery of this jig main body, so that the turning radius of the cutting tool and the radius of the moving element of the ultrasonic motor can be adjusted. Can be almost matched. Also,
Since it is not necessary to use a spindle, the weight can be used to improve the rigidity of the jig body, which makes the jig lighter and more rigid when considered as a whole processing jig. Furthermore, the excellent responsiveness of the ultrasonic motor enables highly accurate position control. From the above, it is possible to prevent the positional deviation of the processing jig and the deterioration of the processing accuracy due to vibration.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows the structure of the processing jig. In FIG. 1, 1 is a cutting tool, 2 is a jig body integrated with a moving element of a disc type ultrasonic motor, and 3 is an ultrasonic motor vibrator for rotating a processing jig. Here, the case where two cutting tools 1 are attached to the jig body 2 is shown, but the cutting tool 1 attached to the jig body 2
It goes without saying that the number of can be any number as long as it does not greatly change the rigidity of the processing jig or the balance of rotation. The ultrasonic motors 2 and 3 used here are those described in Japanese Patent Application No. 59-28986.

A process for processing the polygon mirror in the above description will be described with reference to FIG. In FIG. 2, 1 is a cutting tool, 2 is a jig body integrated with an ultrasonic motor mover, 3 is an ultrasonic motor oscillator, 4 is a processing apparatus body, 5 is a polygon mirror holder, and 8 is a polygon. It is a mirror. An ultrasonic motor vibrator 3 attached to the processing apparatus main body causes a rotational driving force to be applied to the jig main body 2 to which the cutting tool 1 is attached, so that the jig main body 2 makes a rotational movement, and the cutting tool 1 is a polygon mirror. The surface of No. 8 is processed. When the processing is performed by this method, the shape accuracy of the surface of the polygon mirror is about 10 to 100 times better than that when processed by the conventional method.

The same effect can be obtained even if the jig main body shape and the cutting tool attachment method are different from each other as long as the rotation accuracy of the ultrasonic motor is not affected.

[0011]

As described above, according to the present invention, the position of the cutting tool at the time of rotation is rotated by rotating the processing jig having the cutting tool of the polygon mirror processing device as an integral structure with the moving element of the ultrasonic motor. It is possible to eliminate the blurring and improve the processing accuracy. Furthermore, since no spindle is used, the processing jig can be made lightweight and highly rigid,
It is possible to prevent a reduction in processing accuracy due to vibration of the jig and the cutting tool. Further, it is possible to perform highly accurate processing because of the good positional accuracy of the ultrasonic motor.

[Brief description of drawings]

FIG. 1 is a simplified perspective view showing a main part of a processing jig according to an embodiment of the present invention.

FIG. 2 is a simplified perspective view showing a main part of a processing jig using a rod-shaped jig body of a conventional processing apparatus.

FIG. 3 is a simplified perspective view showing a processing process of a conventional processing apparatus.

FIG. 4 is a simplified perspective view showing a main part of a processing jig using a disk-shaped jig body of a conventional processing apparatus.

FIG. 5 is a perspective view showing a main part of a processing jig using a disk-shaped jig body of another conventional processing apparatus.

[Explanation of symbols]

 1 Cutting Tool 2 Jig Body (Ultrasonic Motor Mover) 3 Ultrasonic Motor Oscillator 4 Machining Machine Body 5 Bar Jig Body 6 Polygon Mirror Holder 7 Spindle 8 Polygon Mirror 9 Machining Machine Standard 10 Disc Jig Body

Claims (1)

[Claims] 1. A polygon mirror machining apparatus for machining a cylindrical polygon mirror by rotating a machining jig having a cutting tool attached thereto, wherein the machining jig is rotated by an ultrasonic motor. ..