KR100201931B1 - Detecting and adjusting system for cd deck - Google Patents

Abstract

The present invention relates to a compact disc deck inspection / adjustment system which operates automatically and is composed of one system to secure the reliability of the inspection / adjustment process and improves the performance of the product, and shortens the working time. 110, the measuring unit 120 for checking the signal and state of the deck A, the analog-to-digital (A / D) converter 130, and the state of the deck (A) is determined and the result is displayed on the screen. A computer 140 and an adjusting unit 150 are displayed on the display unit 120. The measuring unit 120 includes a jitter measuring unit 121 measuring an RF signal, a noise measuring unit 122 measuring an FEO signal, and an RF signal. An envelope detector 123 for detecting the level of the signal and measuring the TE signal, and a level shift circuit 124 for measuring the FE signal, the adjustment unit 150 is the focus bias variable resistor of the deck (A) in accordance with the operation And motors for changing variable balance and tracking balance (15) 1), a motor driver 152, and a digital input / output unit 153 for operating the motor driver 152 according to the inspection result of the computer 140.

Description

Compact Disc (CD) Deck Inspection / Adjustment System

The present invention relates to a compact disc (CD) deck inspection / adjustment system, and in particular, to a compact disc deck inspection / adjustment system capable of automatically checking and adjusting the signal status and mechanism of the deck in the production line of a CD-ROM drive. It is about.

In general, the production line of the CD-ROM drive performs the process of checking and adjusting the signal status and mechanism of the deck as a final step before shipment of the product.

1 is a view showing the configuration of a compact disc deck inspection / adjustment system according to the prior art.

Referring to FIG. 1, conventionally, a first oscilloscope 11 measuring and displaying a tracking balance of a deck A, and a second oscilloscope 12 measuring and displaying a radio frequency (RF) level of a deck (A). And a control box for controlling the system according to output results of the first and second oscilloscopes 11 and 12 and the jitter measuring device 13, which display the radio frequency level and the amount of jitter. (control box) 14, a work jig 15 for holding and supporting the deck A, and a power meter 16 for supplying power necessary for inspection and adjustment operations.

The operation of the conventional compact disc deck inspection system constructed as described above will be described with reference to the flowchart attached to FIG. 2.

First, in step S11, each measuring instrument, that is, the first oscilloscope 11, the second oscilloscope 12, and the jitter measuring instrument 13 are connected to the control box 14.

In step S12, the deck A is placed on the work jig 15, and the power meter 16 is turned on. In this case, the first oscilloscope 11 measures and displays the tracking balance of the deck A, and the second oscilloscope 12 measures and displays the radio frequency (RF) level of the deck A. FIG.

In step S13, the operator visually observes the radio frequency level and jitter amount displayed by the jitter measuring unit 13 to determine whether the signal and the scale are correct. In step S14, the operator determines whether the control box ( 14) to adjust the volume.

At this time, the adjustment of the radio frequency level is a tracking error after pressing the skip switch once in the test mode state, and the tracking motor is paused, and pressing the skip switch once again becomes a normal radio frequency. . At this time, the focus offset variable resistor (focus offset VR) is adjusted so that the pattern is the clearest and the amplitude is the largest.

In addition, the radio frequency level and jitter amount inspection of the jitter measurer 13 adjusts a focus offset variable resistor in a test mode state so that the radio frequency level and jitter are optimal. The skip switch is then pressed to check for jitter and level at the outer periphery with the pick up moved outward.

In addition, the tracking balance signal is adjusted using a tracking offset VR so that the negative signal and the positive signal are made equal with respect to the ground (0V) in the test mode state.

After the above process is completed, turn off the test mode and press the skip switch once. Then, the pickup moves to the inner circumference, rotates at 8 times speed, and is automatically ejected after repeatedly moving from the inner circumference to the outer circumference. .

In the conventional compact disc deck inspection / adjustment system as described above, since the operator reads the measuring device with the naked eye and adjusts the offset value, a large dispersion of the error and a long inspection time occur, which causes a large number of workers.

In addition, there is a concern that the operator may have a wrong operation of the volume due to the noise inflow of the measurement signal, thereby reducing the reliability of the inspection and adjustment operations.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems of the prior art, and its object is to provide a compact disc deck inspection / adjustment system that can be performed quickly and automatically by modularizing the signal and mechanism inspection and adjustment of the compact disc deck. To provide.

1 is a block diagram showing the configuration of the prior art;

2 is a flowchart showing a conventional operation;

3 is a block diagram showing a configuration of the present invention;

4 is a circuit diagram showing the configuration of an envelope detector according to the present invention;

5 is a flowchart illustrating the operation of the present invention.

Explanation of symbols for main parts of the drawings

110: power supply 120: measuring unit

121 jitter meter 122 noise meter

123: envelope detector 124: level shift circuit

130: analog / digital (A / D) converter 140: computer

150: adjusting unit 151: motor

152: motor driver 153: digital input and output

161: non-inverting amplifier circuit 162A, 162B: RC differential

163A, 163B: Half-wave rectifier circuit 164: Differential amplifier

In order to achieve the above object, the present invention provides a power supply unit for supplying driving power to a system, a measurement unit inspecting a signal and a state of a deck, and an analog / digital (A) converting an output signal of the measurement unit into a digital signal. Compact disc deck inspection, characterized in that it comprises a converter, an inspection unit for determining the state by receiving the output signal of the analog / digital converter, and an adjustment unit for adjusting according to the determination result of the inspection unit / Provide a coordination system.

According to an embodiment of the present invention, the measuring unit includes a jitter measuring unit, a noise measuring unit, an envelope detector, and a level shift circuit.

Hereinafter, a preferred embodiment of the compact disc deck inspection / adjustment system according to the present invention will be described in detail with reference to the accompanying drawings.

3 is a block diagram showing the configuration of the present invention, and FIG. 4 is a circuit diagram showing the configuration of the envelope detector of the present invention.

Referring to FIG. 3, the compact disc deck inspection / adjustment system of the present invention is a power supply (POWER SUPPLY) 110 for supplying driving power to the deck (A), and the measurement to check the signal and state of the deck (A) The unit 120 and an analog / digital converter (hereinafter referred to as A / D) converter 130 for converting the output signal of the measurement unit 120 into a digital signal, and the output signal of the A / D converter 130. It is composed of a computer 140 that receives the input and determines the status and displays the result on the screen, and the adjustment unit 150 for performing the adjustment according to the determination result of the computer 140.

The measurement unit 120 detects a level of an RF signal by detecting a level of an RF signal, a jitter measuring unit 121 measuring a radio frequency (RF) signal, a noise measuring unit 122 measuring a focus error offset (FEO) signal, an envelope detector 123 for measuring an error) signal and a level shift circuit 124 for measuring a focus error (FE) signal.

The adjusting unit 150 may include a motor 151 for changing the focus bias variable resistor and a tracking balance variable resistor of the deck A, a motor driver 152 for determining the operation of the motor 151, and the The digital input / output unit 153 is configured to receive a control signal and operate the motor driver 152 according to the inspection result of the computer 140.

Referring to FIG. 4, the envelope detector 123 is connected to an input terminal to compensate for an input bias current, and an index when the amplification voltage output from the non-inverting amplifier circuit 161 is changed. RC differentiators 162A and 162B having capacitors charged with charge, half-wave rectifier circuits 163A and 163B to receive the output signals of the RC differentiators 162A and 162B, and the highest and lowest values of RF are inputted. It consists of a differential amplifier 164 that outputs the desired level.

The operation of the present invention configured as described above will be described with reference to the flowchart attached to FIG. 5.

In step S101, the CD-ROM deck is mounted on the work jig. In step S102, the radio frequency (RF) is turned on while the focus, tracking, sled, and spindle servos are turned on. Measure the jitter amount and level with a signal source.

In step S103, with the envelope detector turned on, the focus and spindle servos are turned on, and the tracking and sled servos are turned off. Measure the equality of the minimums.

In step S104, the S-curve is measured using a level shift circuit with the spindle servo on and the focus, tracking, and sled servo off. Therefore, double speed test and noise test are performed. In this case, the reason for using the level shift circuit is to level up the negative value with respect to ground because the focus error signal is displayed before the servo is applied.

The signals measured by the above operation are converted into digital signals by the A / D converter 130 and displayed on the computer 140 in step S105.

In step S106, the inspection standard specification (SPEC) is compared with the A / D converted data, and if it is different from the standard, step S107 performs input / output of a digital signal, and in step S108, a control signal is output to the motor driver 152. In step S109, the focus bias variable resistor and the tracking balance variable resistor are adjusted according to the control signal.

As described above, the compact disc deck inspection system of the present invention operates automatically, and because it is configured as a single system, the operation is performed accurately, thereby ensuring the reliability of the inspection / adjustment process and improving the performance of the product. As a result, the working time is shortened, thereby reducing the number of workers.

Claims (4)

A power supply unit for supplying driving power to the system, a measurement unit for checking signals and status of the deck, an analog / digital (A / D) converter for converting the output signal of the measurement unit into a digital signal, and the analog / digital converter And an adjusting unit configured to receive an output signal and determine a state thereof, and an adjusting unit configured to perform adjustment according to the determination result of the inspecting unit. The method of claim 1, The measuring unit includes a jitter measuring instrument measuring a radio frequency (RF) signal, a noise measuring instrument measuring a focus error offset (FEO) signal, an envelope detector detecting a level of the RF signal and measuring a tracking error (TE) signal, Compact disc deck inspection / adjustment system, characterized in that it consists of a level shift circuit for measuring a focus error (FE) signal. The method of claim 2, The envelope detector includes a non-inverting amplifier circuit connected to an input terminal to compensate an input bias current, an RC differentiator having a capacitor that is exponentially charged when the amplification voltage output from the non-inverting amplifier circuit changes, and the RC differentiator. A compact disc deck inspection / adjustment system, comprising: a half-wave rectifier circuit that receives an output signal, and a differential amplifier that outputs a desired level by inputting the highest and lowest RF values. The method of claim 1, The adjusting unit may include a motor for changing the deck's focus bias variable resistor and a tracking balance variable resistor according to an operation, a motor driver for determining the operation of the motor, and a control signal according to a test result of the computer. Compact disc deck inspection / adjustment system comprising a digital input / output unit for operation.