JPH0366074A - Servo track writer - Google Patents

Abstract

PURPOSE:To simplify the structure and handling by using a pulse motor so as to allow the servo head to be in turning motion and using a rotary encoder so as to detect a rotating angle. CONSTITUTION:A pulse motor 5 applies rotary motion and a reducer mechanism 4 delivers the rotary motion of the pulse motor 5 to a positioner 2. A head 1 is fitted to the positioner 2 to be moved in the direction of circular-arc and a rotary encoder 3 measures the rotating angle at the turning center of the positioner 2. Thus, the conversion of rotary motion rotary motion is enough to allow the head 1 to make rotary motion, the structure is simplified, and since a measured data is used directly without the conversion of the measured data by the rotary encoder 3, the operating time is reduced and the handling is simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a servo track writer, and more particularly to a servo track writer having a head positioning mechanism for writing servo information on a disk.

[Conventional technology]

FIG. 2 is a diagram showing an example of a conventional servo track writer.

The servo track writer shown in FIG. 2 includes a head 6 provided for writing servo information on a disk, a positioner 7 that operates the head 6 in the radial direction of the disk around a certain fulcrum, and a straight line of the positioner 7. It is configured to include a linear position measuring device 8 for measuring the amount of directional movement, and a linear actuator 9 for transmitting rotational motion to the positioner 7.

Here, the linear actuator 9 moves in a linear direction to operate the positioner 7. The head 6 is attached to a positioner 7 and moves in an arc direction. The linear position measuring device 8 measures the amount of linear movement of the positioner 7.

[Problem to be solved by the invention]

The conventional servo track writer described above uses a linear actuator to cause the servo head to perform rotational motion, so a mechanism for converting linear motion to rotational motion is required, resulting in a complicated structure. In addition, since a linear position measuring device is used, it is necessary to convert the amount of linear movement into a rotation angle, which increases the calculation time including trigonometric functions and increases the burden on the software for calculation. There were drawbacks.

[Means to solve the problem]

The servo track writer of the present invention includes a head for writing servo information on a disk, a positioner that operates the head in the radial direction of the disk around a fulcrum, and a rotation angle of the positioner around the fulcrum. It is configured to include a rotary encoder for detection, a deceleration mechanism for transmitting rotational motion to the positioner, and a motor for transmitting rotational motion to the deceleration mechanism.

〔Example〕

Next, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a diagram showing an embodiment of the present invention.

The servo track writer shown in FIG. 1 includes a head 1 provided for writing servo information on a disk, a positioner 2 that operates the head 1 in the radial direction of the disk around a certain fulcrum, and a rotation of the positioner 2. It is configured to include a rotary encoder 3 for detecting a rotation angle at the center, a deceleration mechanism 4 for transmitting rotational motion to the positioner 2, and a pulse motor 5 for transmitting rotational motion to the deceleration mechanism 4.

Here, the pulse motor 5 performs rotational movement, and the reduction mechanism 4
transmits this rotational movement to the positioner 2. The head 1 is attached to a positioner 2 and moves in an arcuate direction. The rotary encoder 3 measures the rotation angle at the rotation center of the positioner 2.

〔Effect of the invention〕

Since the servo track writer of the present invention uses a pulse motor to cause the servo head to perform rotational motion, it is sufficient to convert the rotational motion to rotational motion, resulting in a simple structure. Furthermore, since a rotary encoder is used, the measured data can be used directly without being converted, which has the effect of shortening operating time and simplifying handling.

[Brief explanation of drawings]

FIG. 1 is a plan view showing an embodiment of the present invention, and FIG. 2 is a plan view showing a conventional servo track writer. 1...Head, 2...Positioner, 3...Rotary encoder, 4...Deceleration mechanism, 5...Pulse motor, 6...Head, 7...Positioner, 8...Linear Type position measuring instrument, 9...Linear type actuator.

Claims (1)

[Claims] a head for writing servo information on the disk;
a positioner that operates the head in the radial direction of the disk around a fulcrum, a rotary encoder for detecting a rotation angle of the positioner around the fulcrum, and a deceleration mechanism for transmitting rotational motion to the positioner; A servo track writer comprising: a motor for transmitting rotational motion to the speed reduction mechanism.