JPH0386966A - Disk loading device - Google Patents

Abstract

PURPOSE:To shorten time until a start to read the information of a disk by sending out a driving signal to a tray driving device by a disk loading detection signal from a disk detecting means. CONSTITUTION:When the disk is loaded on a tray 1, such a state is detected by disk detectors S1-S5 and a signal is sent out to a control circuit 3. The control circuit 3 receiving this signal drives a tray driving device 8 and starts to pull-in the tray 1. The size of the disk to be loaded on the tray 1 is detected by the disk detecting means S1-S5 and a signal is sent out to the control circuit 3. The control circuit 3 drives a pickup driving device 9 and sends out a signal so that a pickup can be moved to the inner peripheral recording part of the disk. Thus, reading operation can be started simultaneously with the end of loading and the time until the reading start of the disk information can be shortened.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a disc loading device that automatically pulls in a tray and loads a disc when a disc is placed on the tray in an open state.

[Conventional technology]

In conventional disc players, after placing a disc on the tray, the tray can be pulled in by operating an operation button (provided on the player itself or on the remote controller) or by lightly pushing the front of the tray. As a result, the tray retraction drive means is driven to pull in the tray, and then the turntable is raised or the tray is lowered to place the disc on the turntable, and the clamper is driven to turn the disc. It is held between the table and the clamper. When the disk is loaded in this manner, the pickup moves to the recording area on the inner circumference of the disk and then starts moving from the inner circumference toward the outer circumference of the disk to read information.

[Problem to be solved by the invention]

By the way, in the conventional disc loading device described above, loading the disc is troublesome because it is necessary to operate an operation button or push the tray after placing the disc on the tray. There was a problem.

In addition, multiple types of disks with different diameters (for example, 12
To start reading a disc on a so-called compatible disc player, which can play C11 compact discs and optical video discs with a diameter of 30 cm, after loading the disc, the pickup first selects a compact disc with a diameter of 12 cm. After moving to the outer periphery of the video disc, it is detected whether or not the focus servo can be set. If the focus servo is set, it is determined that the disc is a video disc, and the disc is moved to the inner periphery information surface of the video disc and starts reading. If it is determined that the focus servo cannot be set, the pickup is moved to the inner circumference of the compact disc, and then it is detected whether or not the focus servo can be set. If the focus servo is set, it is determined that the disc is a compact disc, and Since the device moves to the circumferential information surface and starts reading, there is also the problem that it takes time to start playback.

The present invention aims to solve the above-mentioned problems, and its purpose is to automatically load the disc when it is placed on the tray, thereby eliminating the need for any loading operation. Also, when a disc is placed on the tray, the size of the disc is automatically detected, the pickup automatically moves to the inner recording area according to the disc size, and the reading operation begins as soon as loading is completed. Therefore, it is an object of the present invention to provide a disc loading device that can shorten the time it takes to start reading information from a disc.

[Means to solve the problem]

The disk loading device of the present invention is intended to achieve the above-mentioned object, and includes a disk detection means that is attached to a tray and detects that a disk is placed thereon, and a disk detection means that is attached to a tray and detects that a disk is placed on the tray, and and a control circuit that sends a drive signal to the tray drive device in response to a signal from the disk detection means that detects that a disk is placed.

Further, a disk detection means attached to the tray detects the size of the disk placed on the tray, and a tray drive device that pulls in the tray in an open state.
a pickup moving device that moves a pickup that reads information on the disc on the tray from an inner circumferential information portion of the disk toward an outer circumferential information portion; and a pickup moving device that moves a pickup that reads information on the disk on the tray from an inner circumferential information portion to an outer circumferential information portion, and a signal that detects the size of the disk from the disk detecting device to the tray drive device. and a control circuit that sends a drive signal to a pickup moving device that moves the pickup to an inner circumferential information portion corresponding to the size of the disk.

[For production]

In the disk loading device of the present invention configured as described above, when a disk is placed on the tray, the disk detection device detects this and sends a signal to the control circuit,
The control circuit that receives this signal drives the tray drive device to start pulling in the tray. Further, the disk detection means detects the size of the disk placed on the tray and sends a signal to the control circuit, and upon receiving this signal, the control circuit drives the tray drive device to start pulling in the tray. and a signal that drives the pickup moving device to move the pickup to the inner recording area of the disc placed on the tray, and immediately starts reading information on the disc when loading the disc. be.

[Embodiment of the Invention] Hereinafter, an embodiment of a disk loading device according to the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view of the tray 1, and FIG. 2 is a cross-sectional view of the tray 1. The tray 1 has a stepped portion 1a on which a 30 cm video disc is placed, and a stepped portion 1b on which a 20 cm video disk is placed. A stepped portion IC on which a 12 cm compact disc is placed and a stepped portion 1d on which an 8 cm single compact disc is placed are formed, and the respective stepped portions 1a are formed.
Sensors S1 to S4, which are photocouplers or mechanical switches, are attached to 1d, and a sensor S5 is also attached to the outermost peripheral portion 1e of the tray 1.

Lead wires 2 from the respective sensors S1 to S5 are routed along the bottom surface of the tray 1 and connected to a control circuit 3 in FIG. 3, which will be described later.
connected to.

FIG. 3 shows a block diagram for controlling the retracting operation of the tray 1 and the movement of the pickup based on the sensor outputs from the sensors S1 to S5, and numeral 3 denotes a control circuit that performs the operations shown in FIG. 4, and 4 5 is a tray open switch that is turned on when tray 1 is in an open state, 5 is a tray close switch that is turned on when tray I is in a closed state, and 6 is a tray that receives outputs from the sensors S1 to S5 and is placed on tray 1. 31 to S inputted via the control circuit 3 as a RAM for determining the size of the disk placed on the disk.
Judgment is made based on the ON signal of 5. That is, sensor S1
In the case where ~55 is a sensor such as a mechanical switch, if sensor S1 is on, it is determined that it is an 8-inch single compact disc, and if sensor S2 is on, it is determined that it is a 12 cm single compact disc.
sensor S8. If sensor S4 is on, it is determined that it is a 20cm video disc, and if sensor S4 is on, it is determined that it is a 30cm video disc, and if any of sensors S1 to S5 are off, it is determined that there is no disc. It makes a judgment and sends out the respective output.

In addition, if sensors S1 to S5 are optical sensors such as photocouplers, if only sensor S1 is on, it is determined that it is an 8 cm single compact disc, and sensor S
If 1+32 is on, it is determined that it is a 12cm compact disc, and if sensors S and -3a are on, it is determined that it is a 12cm compact disc.
Furthermore, if sensors S1 to S4 are on, it is determined to be a 30 cm video disc, and if any of sensors S1 to S5 are off, it is determined that there is no disc. These outputs are sent out respectively.

Note that the sensor S5 is provided especially for the sensors S1 to S4.
In the case of an optical sensor, the sensor is designed to prevent malfunction when external light such as lighting is turned off, and is placed in a position where it is not blocked by the disk.

7 is a ROM; 8 is a tray drive device that draws in and pulls out the tray 1 in response to a command signal from the control circuit 3; 9 is a tray drive device that operates according to the size of the disk placed on the tray l in response to a command signal from the control circuit 3; A pickup moving device 10 moves the pickup to a starting position, and 10 is an alarm device that issues an alarm in response to a signal detected by the control circuit 3 that two or more disks of different sizes are placed.

Next, the operation will be explained based on the above-described configuration with reference to the flowchart shown in FIG.

Note that an optical sensor such as a photocoupler is used as the sensor 5t-35.

First, the control circuit 3 determines whether the tray l is in the open state using the tray open switch 4 or the tray close switch 5 (step SO), and if it is in the closed state, waits until an eject command is issued by the eject operation (step SO). S1) When an eject command is issued, a signal is sent to the tray drive device 8 to pull out the tray 1, and the tray 1 is pulled out (step S2).

In this way, when tray 1 is pulled out in step SO or step S2, there are cases where a disk is already placed on tray 1 that has been pulled out, and cases where there is no disk placed on it. Circuit 3 is sensor S
1 to S4 are in the previous state, that is, sensors S1 to
It is monitored whether there is a change in the state of S4 (step S3).

Then, there was a change (without disc, with disc,
When detecting the presence of a disk (or the case where a large-diameter disk is stacked on a small-diameter disk), the control circuit 3 monitors whether all of the sensors S1 to S4 are off (step S6).

In this state, the control circuit 3 controls all sensors S1 to S4.
If it detects that it is off, it means that some disk was removed from the first place, so
The disk flag indicating that there is no disk is turned off (steer knob S7), and the loading command in step S4 is waited for (step S7).

While waiting for loading in step S4, if there is no loading command and one of the sensors S1 to S4 sends out a signal indicating that a disk has been detected, it is detected in step S3 that there has been a change from the previous state, so step S6 The process goes to step S8 via . In this step S8, it is monitored whether the disk flag is off, and if the disk flag is off, the timer is reset (step S9), and it is monitored whether the timer has elapsed for a predetermined time (step 5IO). ). Then, when no change occurs in the sensors S1 to S4 within the time set by the timer and the time has elapsed, the disk flag is turned on and a disk size detection signal is output (step 511). Since this output is sent to the tray drive device 8, the retraction of the tray 1 is started (step S5
), and after the pull-in is completed, the pickup moving device 9 operates according to the disk size signal to move the pickup to the start position corresponding to the disk placed on the tray 1 (step 318), and moves the pickup to the start position corresponding to the disk placed on the tray 1. Start reading the information.

On the other hand, within the timer time in step SIO described above, since it is monitored in step 312 whether the sensor 5t-34 is in the immediately previous state, the sensor S1
~ When a change occurs in S4 (when a disk is removed or when a large diameter disk is placed on a small diameter disk), in step 513, it is monitored whether all sensors S1 to S4 are off, If it is off, the routine returns to step S4, and if it is not off (when a large diameter disc is placed on a small diameter disc), the process advances to step S15.

In this step 315, if it is determined that the disk flag is not off in step S8 (this is a case where a large diameter disk is stacked on top of a small diameter disk originally placed on tray l), Step 33
, from step S13 through S6,
An output is sent to the alarm device 10. Therefore, the alarm device 10 operates to issue an alarm or display a warning (step 515). After that, the control circuit 3
Step 516) to monitor whether all S4s are off.
When it is detected that all the sensors S1 to S4 are turned off, the disk flag is turned off and the process returns to the routine of step S4.

Next, the operation will be explained with reference to the flowchart shown in FIG.

In this embodiment, the difference from the operation in FIG. 4 described above is that step SO or step S2 is changed to step S.
In contrast, if the tray 1 is in the open state in step SO or step S2, it is monitored whether all the sensors S1 to S4 are off or not. If it is off, turn off the disk flag (step 520), and if it is on, turn on the disk flag (step 521), and then go to step Sa in FIG. Since the operation other than the progress is exactly the same as the operation shown in FIG. 4, a detailed explanation of the operation will not be given.

In the above-mentioned embodiment, it is not possible to detect overlapping of a small-diameter disk when a small-diameter disk is placed on a large-diameter disk, but normally, if a large-diameter disk is placed, the disk guide step is not detected. Since the disc is hidden, there is no possibility of placing a large-diameter disc on top of it, so there is no need to detect that a small-diameter disc is placed on top of a large-diameter disc. .

Furthermore, in the above-mentioned embodiment, the sensors St to S4 were explained using optical sensors, but this sensor S
If mechanical switches 1 to S4 are used, there is no need for a disk flag to detect overlapping disks, and if two or more of the switches are turned on, it can be simply determined that disks are overlapping disks. It is something.

Further, in step S16, all the stacked disks are removed before proceeding to step S17, but it is determined that only the stacked disks are removed and only the bottom disk is present. Then, the process may proceed to step S9.

Furthermore, although a predetermined time is measured in step SIO,
If there is a manual command to close tray l within this time, it goes without saying that this command will be given priority.

[Effects of the Invention] As described above, in the present invention, when a disk is placed on the tray, the disk detection device detects this and sends a signal to the control circuit, and the control circuit that receives this signal starts driving the tray. Since retraction of the tray is started by driving the means, the effort of loading operation is not required at all and the operability is improved. Further, the disk detection means detects the size of the disk placed on the tray, sends a signal to the control circuit, drives the pickup moving means, and moves the pickup to the inner recording area of the disk placed on the tray. Since the reading operation is started at the same time as the loading is completed, it is possible to shorten the time it takes to start reading information from the disc.

[Brief explanation of drawings]

Fig. 1 is a perspective view of the tray portion, Fig. 2 is a sectional view of the same as above, Fig. 3 is a block diagram, Fig. 4 is a flowchart of the first embodiment, and Fig. 5 is a flowchart of the second embodiment.
It is a flowchart figure of an Example. DESCRIPTION OF SYMBOLS 1... Tray, S1-S5... Disk detection sensor, 3... Control circuit, 8... Tray drive device, 9...
・Pickup moving device.

Claims (2)

[Claims] (1) A disk detection means attached to the tray to detect that a disk has been placed; a tray drive device that pulls in the tray in an open state; and a disk detection means to detect that a disk has been placed from the disk detection means. 1. A disk loading device comprising: a control circuit that sends a drive signal to the tray drive device based on a detected signal. (2) a disk detection means attached to the tray and detecting the size of the disk placed on the tray; and a tray drive device that pulls in the tray in an open state;
a pickup moving device that moves a pickup that reads information on the disc on the tray from an inner circumferential information area of the disk toward an outer circumferential information area, and a signal that detects the size of the disk from the disk detecting means to the tray driving device. What is claimed is: 1. A disk loading device comprising: a drive signal; and a control circuit that sends a drive signal to a pickup moving device that moves the pickup to an inner circumferential information portion corresponding to the size of the disk.