JPH0718064Y2 - Disk playback device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial field of application) The present invention relates to a disc reproducing apparatus for reproducing a compact disc, a video disc, etc., and particularly, an improved function for obtaining an adjustment mode of the device. It is a thing.

(Conventional example) In a device for reproducing a compact disc, a video disc, or the like, tracking adjustment of a pickup is necessary. In a device that obtains a tracking error signal by using a laser, a tracking signal is picked up by using a photodiode, but since there are variations in the photodiode when it is finally commercialized,
It is necessary to adjust the output level and balance. In order to make this adjustment, it is necessary to obtain a tracking error signal, but if this signal is supplied to the tracking servo means, an error signal to be adjusted cannot be obtained. For this reason, it is necessary to turn off the tracking servo means provided in the device. Further, when the tracking servo means is turned off, it usually affects the servo means of the pickup feed motor that controls the feed position of the pickup by the output of the tracking servo means. Therefore, it is necessary to turn off the pickup feed motor servo means. There is. The focus servo is turned on. The state of such a device is hereinafter referred to as a tracking error signal adjustment mode.

In order to obtain the above tracking error signal adjustment mode, the conventional device is switched as shown in FIG.

In the figure, 11 is a pickup device using a laser, the signal detected here is amplified by an amplifier 12, and the tracking error signal is supplied to a system control circuit 13. Although not shown, a reproduction signal such as original audio information or video information is supplied to the reproduction processing circuit.

A tracking servo means A and a feed motor servo means B act on the pickup device 11. The tracking servo means A receives a control signal from the system control circuit 13 to perform tracking control, and its control information is made based on the tracking error signal. The tracking servo means A is composed of an amplifier 15, an output amplifier 16, a drive coil 17, etc., and a connector SW1 for turning off the operation of this servo means.
Is provided. The servo means B of the feed motor is composed of an amplifier 18, an output amplifier 19, a servo motor 20 and the like, and this servo means is also provided with a connector SW2 for turning off the operation. The microcomputer 21 is used for controlling the operation of the system control circuit 13, setting the operation mode of the device, determining external input, error correction processing of signals, and the like.

(Problems to be Solved by the Invention) In the above device, when the tracking error signal adjustment mode is set, it is necessary to turn off the tracking servo means A and the feed motor servo means B. Therefore, in the conventional device, the connectors SW1 and SW2 provided in each servo means are turned off. Then, after the adjustment is completed, the connectors SW1 and SW2 are respectively connected again so that the servo operation can be obtained.

Therefore, the conventional device requires the connectors SW1 and SW2, which increases the cost. Further, there is a problem that the work to be performed before and after the adjustment work increases, and the entire adjustment time becomes long.

Therefore, an object of the present invention is to provide a disc reproducing apparatus which can form a tracking error signal adjustment mode by a simple operation without requiring the conventional connector as described above and which can be easily released.

[Configuration of Device] (Means for Solving Problems) This device has a mounting detection signal output terminal and a non-mounting detection signal output terminal in order to detect whether or not a disc is mounted inside the device. When a detection signal is obtained from both the disc mounting state detection switch and the mounting detection signal output terminal and the non-mounting detection signal output terminal of the disc mounting state detection switch, the signal obtained from the pickup is processed. The tracking error signal to the tracking servo means by turning off the switch, and the output signal of the tracking servo means as a control signal to the feed motor servo means of the pickup is turned off to switch the line switch from the pickup. A controller that uses the playback output to put the device into tracking error signal adjustment mode. And an operation switch for canceling the tracking adjustment mode of the apparatus are provided, and normally, for example, a detection signal can be obtained from both the mounting detection signal output terminal and the non-mounting detection signal output terminal of the disk mounting state detection switch This is so that the adjustment mode can be obtained when it is impossible.

(Operation) By the above means, the adjustment mode can be easily obtained by intentionally short-circuiting the non-device detection signal output terminal and outputting the detection signal while the disc is mounted.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention, 31 is a pickup device using a laser, and the signal detected here is
The tracking error signal amplified by the amplifier 32 is supplied to the system control circuit 33. Although not shown, the reproduction signal of the original audio information or video information,
It is supplied to the reproduction processing circuit.

A is a tracking servo means, and B is a feed motor servo means. In this invention, the tracking servo means A receives a control signal from the system control circuit 33 to perform tracking control, and the control information is made based on the tracking error signal. The tracking servo means A includes an amplifier 35, an output amplifier 36, a drive coil 37.
A switch swa for turning off the operation of the servo means is provided inside the system control circuit 33. The servo means B of the feed motor is composed of an amplifier 38, an output amplifier 39, a servo motor 40, etc., and this servo means is also provided with a switch swb for turning off the operation. This switch swb also has the above system control circuit. It is provided inside 33.

The system control circuit 33 is formed of a large-scale integrated circuit, and can be controlled by the microcomputer 41 in various ways. That is, the microcomputer 41 can turn on or off the switches swa and swb.

Further, the microcomputer 41 is supplied with the output signal of the disk mounting state detection switch swc which detects whether or not a disk is mounted in the device. The disk mounting state detection switch awc has a mounting detection signal output terminal X and an unmounted detection signal output terminal Y. The switch swc is driven by a tray that conveys a disk and can be inserted into and removed from the inside and outside of the apparatus. The terminal Y is short-circuited when the tray is open, and the terminal X is short-circuited when the tray is closed. .

The state shown in the figure shows a state in which the terminal X is short-circuited and a disc is mounted. If the device is set to the tracking error signal adjustment mode, the terminal Y may be short-circuited by a metal pin or a driver in the illustrated state.

Then, in the microcomputer 41, a program as shown in FIG. 2 is activated and the device can be put into the adjustment mode.

Description will be given with reference to FIG. When the terminals X and Y are short-circuited and a low level signal is input to the microcomputer 41, this information is judged in steps s1 and s2, and the adjustment mode is set (step s3). At this time, the microcomputer 41 turns off the switches swa and swb, and deactivates the tracking servo means A and the feed motor servo means B. In this state, work for adjusting the output level and balance of the tracking error signal is performed.

When adjustment is completed, for example, when the stop button is operated,
This is detected in step s4, and the process proceeds to step s2. In step s2, if only one of the terminals X and Y is short-circuited, the normal mode is set (step s5).

As described above, according to the present invention, for example, when both of the terminals X and Y for detecting the opening and closing of the tray are short-circuited (which cannot be the normal state of using the device), the adjustment or test mode is automatically performed. It is configured to migrate. The microcomputer 41 controls the servo means switches swa and swb. Therefore, it is not necessary to detach the connector of the servo means or connect the servo means after the adjustment in order to enter the adjustment mode as in the conventional case. Although a dedicated switch may be provided as a switch for canceling the adjustment mode in step s4, the cancel operation can be obtained by the output of an operation switch such as stop and play that has been conventionally used. It is advantageous in terms of price and space.

[Effects of the Invention] As described above, the present invention provides a disc reproducing apparatus that does not require a conventional connector, can form a tracking error signal adjustment mode with a simple operation, and can easily cancel the mode. You can

[Brief description of drawings]

FIG. 1 is a configuration explanatory view showing an embodiment of the present invention, FIG. 2 is a flow chart for explaining the operation of the present invention, and FIG. 3 is a diagram for explaining the configuration of a conventional disc reproducing apparatus. . 31 ... Pickup device, 32 ... Amplifier, 33 ... System control circuit, 35, 38 ... Amplifier, 36, 39 ... Output amplifier, 37 ... Tracking coil, 40 ... Motor, 41 ... Microcomputer, swa, swb, swc ... Switch.

Claims (3)

[Scope of utility model registration request] 1. A tracking servo means for tracking a pickup along a track spirally recorded on a disk surface, and a servo means of a feed motor for moving the pickup in a radial direction of the disk. And a disc mounting state detection switch having a mounting detection signal output terminal and a non-mounting detection signal output terminal for detecting whether or not the disc is mounted inside the device. When a detection signal is obtained from both the attachment detection signal output terminal and the non-attachment detection signal output terminal of the attachment state detection switch, the signal obtained from the pickup is processed and a tracking error signal is supplied to the tracking servo means. Switch off the line to Control means for turning off the switch of the line supplying the servo means of the feed motor as a control signal with the output signal of the servo control means and shifting the apparatus to the tracking error signal adjustment mode using the reproduction output from the pickup; A disc reproducing apparatus comprising: an operation switch for canceling the tracking adjustment mode. 2. The utility model registration claim, wherein the disk mounting state detection switch is a tray switch for detecting the position of a tray on which a disk is placed and which can be inserted into and removed from the apparatus. The disc reproducing apparatus according to item 1. 3. The utility model registration claim, wherein the operation switch for releasing the tracking adjustment mode is also used as an operation switch for stopping, reproducing, etc., which is operated to obtain a normal operation of the apparatus. The disc reproducing apparatus according to the first item.