JPH1125557A - Disc loading mechanism - Google Patents

Abstract

(57) [Problem] To accurately detect the position of a disk tray based on a detection output of a single contact type tray position detection switch and a voltage application history of a loading motor. A tray position detection switch that is closed at a disc discharge position and a disc mounting position, respectively, and is opened at an intermediate position between both positions, on a cam gear driven by the rotational power of a loading motor that can be driven forward and reverse. 12
If the tray position detection switch 12 is closed when the power is turned on, a voltage having a drive polarity for conveying the disc in the disc ejection direction or the disc loading direction is applied to the loading motor 4. The output change of the tray position detection switch 12 at that time is monitored, and the position of the disk tray 2 is specified as one of the disk discharge position and the disk mounting position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk loading mechanism capable of detecting the position of a disk tray in accordance with a single tray position detection switch and a voltage application history of a loading motor.

[0002]

2. Description of the Related Art A CD-ROM device for reproducing a disk-shaped recording medium such as an optical disk has a disk loading mechanism for loading or unloading a disk by a disk tray which moves between a disk ejection position and a disk mounting position. I have. In this type of disc loading mechanism, it is necessary to identify the disc tray in one of three positions, an ejection position (EJECT position), a disc mounting position (IN position), and an intermediate position between the two positions. For example, a tray position detection switch having a first contact and a second contact that are closed at a disc ejection position and a disc mounting position, respectively, has been used.

FIGS. 6A and 6B are a plan view and a side view showing an example of a conventional disk loading mechanism.
The conventional disk loading mechanism 1 shown in FIG.
A disk tray 2 for mounting and transporting an optical disk such as a D-ROM is moved between a disk ejection position and a disk mounting position by a transport means provided on a chassis 3. The rotation power of the motor 4 is transmitted to the disk tray 2 via a transfer unit including the cam gear 5. The tray position detection switch 6 for detecting the position of the disc tray 2 is shown in FIG.
As shown in (A) to (C), the projection 5a protruding from the side surface of the cam gear 5 swings the contact actuator 6a of the tray position detection switch 6, and The contact 61 or the second contact 62 is driven to open and close. A tray operation switch 7 called an EJECT / IN switch is provided on a panel surface covering the front surface of the chassis 3 as a means for inputting an operation command for driving the disk tray 2. A control microprocessor 8 for controlling the drive issues a motor drive command in response to the opening / closing signal of the tray operation switch 7 and the tray position detection switch 6.
This motor drive command is supplied to the motor drive IC 9,
A predetermined voltage is applied to the loading motor 4 by the motor driving IC 9, and the loading motor 4 rotates forward and backward. Note that these control microprocessors 8
The motor drive IC 9 is mounted on a printed circuit board 10 disposed below the tray transport surface.

[0004] The tray position detection switch 6 is shown in FIG.
As shown in the figure, the first contact 61
Is closed, and the second contact 62 is closed at the disk mounting position as shown in FIG. 7 (C). At the intermediate position where the disk tray 2 is located between the disk discharge position and the disk mounting position, both the first contact 61 and the second contact 62 are opened as shown in FIG. 7B. The open / close state of the tray position detection switch 6 is determined by the control microprocessor 8 when the power is turned on, as shown in step (101) of FIG. Then, in the determination step (101), the first position of the tray position detection switch 6 is set.
If it is determined that the contact 61 is closed, the step (10)
In 2), it is determined that the disc tray 2 is at the disc ejection position. Further, in the judgment step (103) following the judgment step (101), if it is determined that the second contact 62 of the tray position detection switch 6 is closed,
In step (104), it is determined that the disc tray 2 is at the disc loading position. Furthermore, when it is determined that both the first contact 61 and the second contact 62 of the tray position detection switch 6 are open, a determination step (103)
In the step (106) following the step
Is determined to be at the intermediate position, and in step (107), the loading motor 4 is driven in the disc loading direction. As a result, the disk tray 2 is transported to the disk mounting position, and is in the disk mounting position when the loading motor 4 is stopped in step (108).

On the other hand, after turning on the power or resetting the control microprocessor 8 as described above,
When the tray operation switch 7 is pressed, in the judgment step (201) of FIG.
The tray position specified in (104) and (108) is determined. In this case, if the tray position is at the disk discharge position, in the following step (202), the loading motor 4 is driven in the disk mounting direction, and in the determination step (203), the tray position detection switch 6 is switched to the closed state. After confirming this, in step (204), the loading motor 4 stops, and the disc tray 2 stops at the disc mounting position.
On the other hand, if it is determined in the judgment step (201) that the tray position is at the disc ejection position, in the subsequent step (205), the loading motor 4
Is driven in the disc loading direction, and the judgment step (20)
In step 6), it is confirmed that the tray position detection switch 6 has been switched to the open state in step 6).
In, the loading motor 4 stops and the disc tray 2 stops at the disc ejection position.

[0006]

The above-mentioned conventional disk loading mechanism 1 uses a two-contact type tray position detection switch 6 having a first contact 61 and a second contact 62 to determine the position of the disk tray 2 at the disk discharge position. And the intermediate position and the disc mounting position are identified to control the conveyance of the disc tray 2. The two-contact type tray position detection switch 6 requires only a large switch body and requires space. However, the number of components including the peripheral wire is large, so that the manufacturing cost is high, and this causes a problem that the manufacturing cost of the entire mechanism is increased. Also, instead of such a two-contact type tray position detection switch 6, 1
A disc loading mechanism using two contact-type tray position detection switches for disc ejection position detection and disc mounting position detection has also been proposed. However, since a single contact-type tray position detection switch is provided at two locations, the switch is used. Two arrangement spaces are required, and the configuration of the apparatus is likely to be complicated, and there is a problem that the manufacturing cost is higher and the cost is higher than when a two-contact type tray position detection switch is used.

The present invention has solved the above-mentioned problem, and accurately detects the position of a disk tray based on the detection output of a single-contact type tray position detection switch and the voltage application history of a loading motor. The purpose is to do so.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a loading motor that can be driven forward and reverse, and a disk tray on which a rotating power of the loading motor is transmitted and a disk is placed. A disc tray conveying means for conveying the disc between a discharge position and a disc mounting position; and a disc tray conveying means provided on the disc tray conveying means. The disc tray is closed at the disc discharge position and the disc mounting position, and is opened at an intermediate position between the two positions. A tray position detection switch, and a voltage having a drive polarity for transporting to the loading motor in one of a disk discharging direction and a disk mounting direction when the tray position detection switch is closed when the power is turned on. And monitoring the output change of the tray position detection switch at that time,
Control means for specifying the position of the disk tray as one of a disk discharge position and a disk mounting position.

Further, the present invention is characterized in that, when the control means receives a tray operation command after turning on the power, based on the specified tray position, the disc is moved toward the tray position opposite to the tray position. A driving polarity voltage for transporting the tray is applied to the loading motor.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 (A) and (B)
FIG. 2 is a plan view and a side view of an embodiment of a disc loading mechanism according to the present invention. FIG. 2 is a plan view of the cam gear shown in FIG. 1, and FIGS. FIG. 4 is a side view showing the operation, FIG. 4 is a flowchart for explaining a tray position detection operation at the time of power-on,
FIG. 5 is a flowchart for explaining the tray position detection operation when the tray operation switch is operated.

The disk loading mechanism 11 shown in FIGS. 1A and 1B uses only one single-contact type tray position detection switch 12 and uses this tray position detection switch 1.
2, the position of the disc tray 2 is detected based on the detection output of No. 2 and the voltage application history of the loading motor 4. Therefore, the tray position detection switch 12
Although the correspondence between the cam gear 13 and a part of the conveying means and the operation software of the control microprocessor 14 have been modified, the other structures are almost the same as the conventional one. Here, the control microprocessor 14 and the motor drive IC 9 constitute a control unit.

The tray position detection switch 12 is of a single contact type. In this case, the tray position detection switch 12 is closed at two positions of a disk discharge position and a disk device position, and is opened at a position intermediate between the disk discharge position and the disk device position. A signal corresponding to each position is supplied to the control microprocessor 14. As shown in FIG. 2, a contact actuator 12a of the tray position detecting switch 12 is provided on the lower surface of the cam gear 13.
Are formed, and the contact actuator 12a is moved in accordance with the movement of the cam gear 13 which rotates as the disk tray 2 is loaded and unloaded, as shown in FIGS. 3 (A) to 3 (C). A pair of protrusions 13a, 1 on the uneven cam surface
The tray position detection switch 12 is opened or closed by being guided up and down by being guided by 3b. 3 (A),
(B) and (C) show that the tray position detection switch 12 is closed at the disk unloading position, opened at the intermediate position, respectively.
This shows a closed state at the disk device position.

First, the operation immediately after power-on or when the control microprocessor 14 is reset will be described. In this case, the control microprocessor 14 determines in step (301) of FIG.
Is determined. Tray position detection switch 12
Is closed, the disc tray 2 is at either the disc ejection position or the disc device position. Therefore, in order to confirm the tray position, the control microprocessor 14 applies a voltage to the loading motor 4 in a direction for discharging the disc tray 2 for a predetermined time, that is, a required transport time t, in a subsequent step (302). Is issued to the motor driving IC 9. Next, in a determination step (303), the open / closed state of the tray position detection switch 12 is determined. In this case, if the tray position detection switch 12 is kept in the closed state, it is clear that the loading motor 4 cannot rotate any more in the disc ejection direction. Therefore, in this case, the determination following the determination step (303) is made. Step (3
In step (04), after confirming that the voltage application time T to the disk tray 2 has exceeded the required transfer time t, in step (305), the driving of the loading motor 4 is stopped, and the disk tray 2 is moved to the disk discharge position. Stop at

On the other hand, when the loading motor 4 is rotated in the disk ejection direction by receiving a voltage, the cam gear 13 is rotated.
With the movement of 13b, the tray position detection switch 12 shifts from the closed state to the open state, and enters the intermediate position detection state. In this case, the disc tray 2 performs the determination step (3
In step (307) subsequent to step 03), it is determined that the disc is at the disk mounting position. Therefore, step (3)
In step 08), the loading motor 4 is driven in reverse until the disk tray 2 returns to the disk mounting position. Step (309) with returning to the disk mounting position
As shown in (1), the driving of the loading motor 4 is stopped, and the disc tray 2 stops at the disc mounting position.

In the determination step (301),
If it is determined that the tray position detection switch 12 is in the open state, it indicates that the disk tray 2 is at the intermediate position. Therefore, in this case, it is determined in step (310) that the disk tray 2 is at the intermediate position. Then, in step (311), the loading motor 4 is driven in the disk loading direction to move the disk tray 2 to the disk loading position. Finally, in step (312), the loading motor 4 is stopped, and the disk tray 2 is stopped. 2
To the disc loading position.

Also, after the power is turned on as described above,
Alternatively, if the tray operation switch 7 is operated after resetting the control microprocessor 14, in the determination step (401) shown in FIG. 5, the tray operation switch 7 is specified in the above-described steps (305), (309), and (312). The determined tray position is determined. Here, when the tray position is at the disk discharge position, the loading motor 4 is driven in the disk loading direction in the subsequent step (402). Further, in a subsequent determination step (403), it is determined whether or not the tray position detection switch 12 has been switched from the open state to the closed state, and it is determined that the tray position detection switch 12 has been opened. 4 stops, and the disc tray 2 stops at the disc mounting position.

On the other hand, if it is determined in the judging step (401) that the tray position is at the disc ejection position, the loading motor 4 is turned on by the following step (40).
In 5), it is driven in the disk mounting direction. further,
In the subsequent determination step (406), it is determined whether or not the tray position detection switch 12 has been switched from the closed state to the open state.
In step (407), the loading motor 4
Stops, and the disc tray 2 stops at the disc ejection position.

As described above, according to the disk loading mechanism 11, the cam gear 13 driven by the rotational power of the loading motor 4 that can be driven forward and reverse is closed at the disk discharge position and the disk mounting position, respectively.
Tray position detection switch 1 that opens at an intermediate position between both positions
2, and when the tray position detection switch 12 is closed when the power is turned on, a voltage having a driving polarity for conveying the disc in the disc ejection direction or the disc loading direction is applied to the loading motor 4. Then, the output change of the tray position detection switch 12 at that time is monitored, and the position of the disk tray 2 is specified as one of the disk discharge position and the disk mounting position. Therefore, the tray position detection switch 12 is opened. For example, in addition to the basic function of the tray position detection switch 12, the disk tray 2 is at the intermediate position, and if the tray position detection switch 12 is closed, it is known that the disk tray 2 is at the disk ejection position or the disk mounting position. If it is known that the disc is at either the disc ejection position or the disc loading position, for example, turn on the power. A voltage is applied to the disc discharging direction during relative loading motor 4, if the output of the tray position detecting switch 12 does not change, the disc tray 2
Is determined to be at the disc ejection position, and conversely, if the output of the tray position detection switch 12 changes,
By judging that the disc tray 2 is located at the disc mounting position, three types of tray positions can be accurately detected by using only the single contact type tray position detection switch 12, whereby the configuration of the entire mechanism is achieved. And at the same time also reduce the manufacturing costs.

When a tray operation command is received after the power is turned on, the drive polarity voltage for transporting the disk tray 2 toward the tray position opposite to the specified tray position based on the specified tray position. Is applied to the loading motor 2, when a tray operation command is received after the power is turned on, the tray position determined immediately after the power is turned on is referred to. When the disc tray 2 is at the disc ejection position, the tray operation is performed. Disc tray 2 in response to command
Applies a voltage to the loading motor 4 so that the disc tray 2 moves to the disc loading position, and when the disc tray 2 is at the disc loading position, the disc tray 2 moves to the disc ejection position in response to the tray operation command. As a result, a voltage can be applied to the loading motor 4 so that the disc tray 2 can be accurately conveyed and driven in a desired direction in accordance with a tray operation command.

[0020]

As described above, according to the present invention,
The disc tray conveying means driven by the rotational power of the loading motor that can be driven forward and reverse is provided with a tray position detection switch that closes at the disc discharge position and the disc mounting position, and opens at an intermediate position between both positions, If the tray position detection switch is closed when the power is turned on, a voltage having a drive polarity for transporting the disc in the disc ejection direction or disc loading direction is applied to the loading motor. By monitoring the output change of the position detection switch and specifying the position of the disk tray as one of the disk ejection position and the disk mounting position, the disk tray is at the intermediate position if the tray position detection switch is opened, If the tray position detection switch is closed, the disc tray is in the disc ejection position or the disc is loaded. In addition to the basic function of the tray position detection switch such that the disc is located at the position, if it is known that the disc is at either the disc ejection position or the disc mounting position, for example, when the power is turned on, If a voltage is applied in the ejection direction and the output of the tray position detection switch does not change, it is determined that the disc tray is at the disc ejection position, and conversely, if the output of the tray position detection switch has changed, It is possible to accurately detect three types of tray positions using only a single contact type tray position detection switch, such as judging that the disk tray was at the disk mounting position, thereby simplifying the configuration of the entire mechanism And
At the same time, excellent effects such as a reduction in manufacturing cost can be achieved.

When a tray operation command is received after the power is turned on, the drive polarity voltage for transporting the disk tray toward the tray position opposite to the specified tray position based on the specified tray position is changed. When the tray operation command is received after the power is turned on, the tray position is determined immediately after the power is turned on. In response, a voltage is applied to the loading motor so that the disc tray moves to the disc loading position, and if the disc tray is at the disc loading position, the disc tray responds to the tray operation command to move the disc tray to the disc ejection position. Voltage can be applied to the loading motor to move to What the effect of such a disc tray can be transported driven exactly to the intended direction.

[Brief description of the drawings]

FIGS. 1A and 1B are a plan view and a side view showing an embodiment of a disc loading mechanism of the present invention.

FIG. 2 is a plan view of the cam gear shown in FIG.

FIGS. 3A to 3C are side views showing the operation of a cam gear and a tray position detection switch.

FIG. 4 is a flowchart for explaining a tray position detection operation when power is turned on.

FIG. 5 is a flowchart illustrating a tray position detection operation when a tray operation switch is operated.

6 (A) and 6 (B) are a plan view and a side view showing an example of a conventional disk loading mechanism.

FIGS. 7A to 7C are side views showing the operation of a cam gear and a tray position detection switch.

FIG. 8 is a flowchart for explaining a tray position detection operation when the power is turned on.

FIG. 9 is a flowchart illustrating a tray position detection operation when a tray operation switch is operated.

[Explanation of symbols]

 1,11 Disk loading mechanism 2 Disk tray 3 Chassis 4 Loading motor 5,13 Cam gear 5a, 13a, 13b Projection 6,12 Tray position detection switch 6a, 12a Contact actuator 7 Tray operation switch 8,14 Control microprocessor 9 Motor drive IC 10 Printed circuit board

Claims (2)

[Claims] 1. A loading motor that can be driven forward and reverse, and a disk tray transporter that receives the rotational power of the loading motor and transports a disk tray loaded with a disk between a disk discharge position and a disk mounting position. Means, a tray position detecting switch provided on the disk tray transporting means, which is closed at the disk discharge position and the disk mounting position and opened at an intermediate position between the two positions, and the tray position detecting switch at power-on. When the motor is closed, a voltage having a drive polarity for conveying the disc in the disc discharging direction or the disc loading direction is applied to the loading motor, and the output change of the tray position detection switch at that time is applied. Monitor
Control means for specifying the position of the disk tray as one of a disk discharge position and a disk mounting position. 2. The control means, when receiving a tray operation command after turning on a power supply, transports the disk tray toward a tray position opposite to the tray position based on the specified tray position. 2. The disc loading mechanism according to claim 1, wherein a voltage having a driving polarity is applied to the loading motor.