KR100194347B1 - Friction Coefficient Measuring Device for Rotating Shaft for Shaft Perturbation Actuator - Google Patents

Abstract

The present invention relates to a friction coefficient measuring device for selecting a rotating shaft having a large friction by measuring the friction coefficient of the rotating shaft for the axis perturbation actuator.

According to the present invention, a driving jig 50 for detachably fixing the rotation shaft 65 to the yoke plate 52 and inserting the testing lens holder 58 into the rotation shaft 65 and the testing of the driving jig 50 is tested. The laser beam is irradiated to the signal generator 40 for applying driving power to the lens holder 58 and the objective lens 60 fixed to the testing lens holder 58 with the optical head 72, and the reflected light is collected. A signal detection that converts the amount of speed of the optical actuator 70 that is received as 74 and measures the driving speed of the objective lens 60 and the objective lens 60 transmitted from the optical actuator 70 and converts it into a displacement amount. A microcomputer 90 which calculates a difference as a friction coefficient and compares the displacement amount transmitted from the signal detection converter 80 with a value proportional to a reference voltage and controls the power supply of the signal generator 40; , Coefficient of friction transmitted from the microcomputer (90) It consists of a signal to the recognizable character as a time to the display driver 100 to output the LCD (102).

The present invention has an effect that the poor manufacturing rate of the actuator can be reduced by easily selecting the rotating shaft 65 having a large friction.

Description

Friction Coefficient Measuring Device for Rotating Shaft for Shaft Perturbation Actuator

The present invention relates to a friction coefficient measuring device of a rotating shaft for a shaft perturbation actuator, and in particular, by fixing the rotating shaft of the shaft perturbation actuator and driving a testing lens holder around the rotating shaft to calculate the friction coefficient of the rotating shaft, The present invention relates to an apparatus for measuring a friction coefficient of a rotating shaft of an axial perturbation actuator for inspecting a manufactured state of the rotating shaft.

In general, an optical pickup device is installed in a disc player to irradiate a disc with laser light and to receive light reflected from the disc to reproduce the recording contents of the disc. And an objective lens for focusing the laser light emitted from the hologram element on the disk surface. The objective lens must continuously move in the optical axis direction and the tracking direction while correcting the error value to form the focus of the laser light on the disk. The actuator is used to move the objective lens in the optical axis and tracking direction.

Among the actuators, the lens holder fixing the objective lens moves in the optical axis and the tracking direction about the rotation axis. As shown in FIG. 1, the objective lens 12 is mounted on the rotation shaft 22 provided in the yoke plate 20. The lens holder 10 fixed thereto is rotatably installed, and a pair of tracking coils 14 are wound and bonded to both sides of the lens holder 10 to be fixed to the guide 24 formed on the yoke plate 20. The magnetic flux of the magnet 26 moves the lens holder 10 in the tracking direction about the rotational axis 22 to correct the tracking error with respect to the focus of the laser light formed on the disk in the objective lens 12. In addition, a focusing coil (not shown) is wound around the rotation axis 22 around the lens holder 10 in a circular shape, so that the magnetic flux of the magnet 30 fixed to the guide 28 of the yoke plate 20 may be reduced. As a result, the lens holder 10 is moved along the rotation axis 22 along the optical axis to correct focusing errors with respect to the focus of the laser light formed by the objective lens 12.

On the other hand, since the lens holder 10 is rotated by being fitted to the rotary shaft 22, unless the rotary shaft 22 is precisely processed, the friction generated by the lens holder 10 becomes large, and thus the driving force of the lens holder 10 is reduced. In the objective lens 12 fixed to the lens holder 10, the laser light cannot be quickly focused on the disk. Therefore, the rotary shaft 22 is precisely processed and then coated with Teflon on the surface to minimize the friction to ensure the driving sensitivity of the lens holder 10.

However, if mass production of the rotary shaft 22 produces a product with a high friction, such products are to be screened and processed to prevent the assembly of the actuator by the poor processing, but the finely processed defects of the rotating shaft are visually identified. There is a problem that is difficult to do.

The present invention has been made in order to improve the conventional problems, an object of the present invention is to measure the friction coefficient of the rotating shaft for the axis perturbation actuator to be manufactured poorly to select the rotating shaft having a large friction.

The above objects include a driving jig for detachably fixing the rotating shaft to the yoke plate and driving the test lens holder by fitting the rotating shaft to the rotating shaft, a signal generator for applying driving power to the testing lens holder of the driving jig, and the testing lens. Displacement amount by integrating the speed of the optical actuator which measures the driving speed of the objective lens by irradiating laser light with the optical head to the objective lens fixed to the holder and receiving the reflected light as a condenser, and the objective lens transmitted from the optical actuator A signal detector and a microcomputer that calculates a difference as a friction coefficient and controls the power supply of the signal generator by comparing the displacement transmitted from the signal detector and a value proportional to the reference voltage, and the friction transmitted from the microcomputer. The letters of the count are displayed on the LCD as visually recognizable characters. By providing chukseop dynamic friction coefficient measuring device of the actuator for the rotating shaft is configured to display driver which can be achieved.

1 is a perspective view showing a general axial perturbation actuator.

Figure 2 is a block diagram showing a rotating shaft friction coefficient measuring apparatus according to the present invention.

〈Description of the symbols for the main parts of the drawings〉

40: signal generator 50: drive jig

52: yoke plate 54, 56: magnet

58: testing lens holder 60: objective lens

70: optical actuator 72: optical head

74: condenser 80: signal detection converter

90: microcomputer 100: display driver

102: LCD

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

First, as shown in FIG. 2, the configuration of the present embodiment is such that the rotating shaft 65 for the axial perturbation actuator is detachably fixed to the yoke plate 52 and the test lens holder 58 is driven by driving the rotating shaft 65. Light is applied to the driving jig 50, the signal generator 40 for applying driving power to the testing lens holder 58 of the driving jig 50, and the objective lens 60 fixed to the testing lens holder 58. An optical actuator 70 for irradiating laser light to the head 72 and receiving the reflected light with the light collector 74 to measure the driving speed of the objective lens 60, and the objective lens transmitted from the optical actuator 70. The difference is calculated as a friction coefficient by comparing the signal detection transducer 80 that integrates the speed amount of 60 and converts it into a displacement amount, and the displacement amount transmitted from the signal detection transducer 80 with a value proportional to the reference voltage. Power supply of generator 40 It consists of the control microcomputer 90 and the microcomputer display driver 100 for outputting (90) a signal recognizable character as a time of the friction coefficient transmitted from the LCD 102.

The driving jig 50 has a connection end 64 to which the power applied from the signal generator 40 is connected to the yoke plate 52, and a connection end of the yoke plate 52 to the testing lens holder 58. A tracking coil 62 connected to a 64 and a focusing coil (not shown) are adhered to each other to drive the lens holder in the tracking direction and the optical axis direction by the magnetic flux of the magnets 56 and 54 fixed to the yoke plate 52. To do that.

Hereinafter, the operation of the rotating shaft friction coefficient measuring device having the configuration as described above.

After rotating the shaft 65 for shaft perturbation actuator precisely and applying Teflon coating on the surface, the friction coefficient for each product is measured, and a product with a large friction is selected for defective treatment.

For this operation, the rotating shaft 65 having the Teflon coating is fitted to the testing lens holder 58 of the driving jig 50 and fixed to the yoke plate 52, and the microcomputer 90 is controlled to signal the signal generator 40. The power is applied to the connection end 64 of the yoke plate 52 of the driving jig 50 by transmitting. Accordingly, power is applied to the tracking coil 62 and the focusing coil connected to the connecting end 64 and attached to the testing lens holder 58 to the magnetic flux of the magnets 56 and 54 fixed to the yoke plate 52. By driving the testing lens holder 58 in the tracking direction and the optical axis direction, the objective lens 60 fixed to the testing lens holder 58 is also driven.

At this time, the microcomputer 90 transmits a signal to the optical actuator 70 to irradiate the laser light to the objective lens 60 of the testing lens holder 58 with the optical head 72, and collects the reflected light. The drive speed of the objective lens 60 is measured. The driving speed of the objective lens 60 measured by the optical actuator 70 is transmitted to the signal detection transducer 80. In this signal detection transducer 80, the driving speed is integrated to calculate the displacement of the objective lens 60. Transfer to the microcomputer (90). In the microcomputer 90, a difference value is calculated as a friction coefficient of the rotation shaft 65 by comparing the displacement amount transmitted from the signal detection converter 80 with the displacement amount proportional to the reference voltage.

Subsequently, the friction coefficient value of the rotation shaft 65 calculated by the microcomputer 90 is transmitted to the display driver 100. In the display driver 100, the LCD 102 is driven to visually display the friction coefficient value of the rotation shaft 65. Display as recognizable characters.

Therefore, the operator recognizes the friction coefficient of the rotating shaft 65 through the characters displayed on the LCD 102 of the display driving unit 100, and selects the rotating shaft 65 having a large friction to perform poor processing, thereby causing a poor rotating shaft. Prevents 65 from being assembled to the actuator.

After the inspection of one rotary shaft 65, the rotary shaft 65 is separated from the yoke plate 52 of the driving jig 50, and the other rotary shaft 65 is fixed to the yoke plate 52 in the manner described above. Continue to inspect.

As described in the above embodiments, the present invention measures the drive speed of the testing lens holder 58 by installing the axis perturbation actuator rotary shaft 65 in the driving jig 50 under the same conditions as the actual actuator. An apparatus for calculating the coefficient of friction of the rotary shaft 65, which is capable of reducing the defective manufacturing rate of the actuator by preventing the poorly manufactured rotary shaft 65 from being easily picked up and assembled into the actuator.

Claims (2)

In the friction coefficient measuring device of the rotating shaft 65 for the shaft perturbation actuator installed in the disc player, A driving jig 50 for detachably fixing the rotation shaft 65 to the yoke plate 52 and inserting and driving a testing lens holder 58 to the rotation shaft 65, and a testing lens holder of the driving jig 50; The laser beam is irradiated to the signal generator 40 for applying driving power to the 58 and the objective lens 60 fixed to the testing lens holder 58 by the optical head 72, and the reflected light is collected. A signal detection converter converting an optical actuator 70 for measuring the driving speed of the objective lens 60 and the speed of the objective lens 60 transmitted from the optical actuator 70 and converting it into a displacement amount 80) and a microcomputer 90 for comparing the displacement amount transmitted from the signal detection converter 80 with a value proportional to a reference voltage, calculating a difference as a friction coefficient, and controlling the power supply of the signal generator 40; Scene of friction coefficient transmitted from microcomputer 90 Chukseop the dynamic friction coefficient measuring device of the actuator for the rotating shaft, characterized in that consisting of a display driving unit 100 for output to the recognizable character as a time on the LCD 102. The 2. The driving jig 50 is provided with a connection end 64 to which the power applied from the signal generator 40 is connected to the yoke plate 52, and the yoke plate (38) is provided on the testing lens holder 58. The tracking coil 62 is connected to the connection end 64 of the 52 to drive the testing lens holder 58 in the tracking direction and the optical axis direction by the magnetic flux of the magnets 56 and 54 fixed to the yoke plate 52. And a friction coefficient measuring device for a rotating shaft for a shaft perturbation actuator, wherein the focusing coil and the focusing coil are bonded to each other.