JP2640064B2 - Disk player disk detector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video disk and a CD disk which are displaceably provided between a mounting / dismounting position for performing a disk mounting / dismounting operation and a reproducing position for performing a disk reproducing operation. The present invention relates to a disc player provided with a tray in which a disc mounting portion is formed concentrically, and particularly to a disc detecting device.

[0002]

2. Description of the Related Art Recently, disc players capable of reproducing both optical video discs and CD discs have become widespread. Such a video disc and a CD disc differ not only in outer diameter but also in a position where signal recording content is recorded, that is, a position called a lead-in area.

[0003] Further, such a disc player is provided so as to be displaceable between a mounting / dismounting position at which a disk mounting / dismounting operation is performed and a reproducing position at which a disk reproducing operation is performed, and a video disk and a CD disk are mounted thereon. The disc mounting section includes a tray formed concentrically. Such video disks include large-diameter disks and small-diameter disks, and CD disks include large-diameter disks and small-diameter disks. Therefore, the concentric disk mounting portions formed on the tray are provided with four mounting portions having different diameters.

In a disc player capable of reproducing both a video disc and a CD disc, when a tray is displaced to a reproduction position and a disc clamping operation is performed, a lead-in area provided on each disc is provided. The operation of reading out the signal recorded in the device by the pickup is performed.

Therefore, in such a disc player,
The type of the disk is detected during the operation of mounting the disk, and the pickup is moved to a position corresponding to the type of the disk based on the detection operation. As a technique for detecting the type of such a disc, for example, there is a technique disclosed in Japanese Utility Model Laid-Open Publication No. 4-49357.

Further, such a disk player is provided with a circuit for detecting the inclination of the video disk and accurately maintaining the positional relationship between the pickup and the video disk, that is, a tilt servo circuit when reproducing the video disk. As a means for detecting the inclination of the video disk, a tilt sensor is used as is well known, and the tilt sensor is provided so as to move together with the pickup.

[0007]

The above-described technology for detecting the type of a disk is configured to detect the type of the disk by a photo sensor. In such a technology, the type of the disk is detected by disturbance light or the like. Sometimes I made a mistake. An object of the present invention is to provide a disk detecting device which improves such a point.

[0008]

According to the disk detecting device of the present invention, a tray provided so as to be displaceable between a loading / unloading position for performing a loading / unloading operation of a disk and a playing position for performing a playing operation of the disk is located at the playing position. When the disk is moved and clamped, the presence / absence of the disk is detected by a tilt sensor that moves together with the pickup.

[0009]

According to the present invention, when a disc clamping operation is performed, the presence / absence of the disc is determined by a tilt sensor provided on a pickup that moves to a predetermined position on the disc.
This is to detect nothing.

[0010]

FIG. 1 is a flow chart for explaining the detection operation of the present invention. FIG. 2 is a plan view of a main part showing a state where a tray is at a first position displaced from a detachable position toward a reproduction position. FIG. 4 is a plan view of an essential part showing a state where the tray is further displaced in the direction of the reproduction position, and FIG. 4 is a side view of the essential part showing a relationship between the tray and the switch when it is in the first position. It is a side view of the principal part which shows the relationship between a tray and a switch at the time of 2 positions.

In FIG. 1, reference numeral 1 denotes a main body of a disc player, and 2 denotes a turntable provided on the main body 1 of the disc player. When the disc is at a reproducing position, the disc is operated by a clamp member (not shown). And has the function of driving the disk to rotate. Reference numeral 3 denotes a tray which is provided so as to be displaceable between a loading / unloading position at which a disk is loaded / unloaded and a playback position at which the disk is played back by a rotating force of a motor or the like, and on which a large-diameter video disk is placed. A first video disk mounting portion 4, a second video disk mounting portion 5 on which a small-diameter video disk is mounted, a first CD disk mounting portion 6 on which a large-diameter CD disk is mounted, and a small-diameter CD
A second CD disk mounting portion 7 on which a disk is mounted is formed concentrically and a cutout 8 is formed.

Reference numeral 9 denotes a photosensor fixed to the disc player main body 1 and arranged in the moving path of all discs to detect the presence / absence of discs placed on the tray 3. ing. Reference numeral 10 denotes a switch that is opened and closed by the displacement operation of the tray 3,
Arrow A which is the direction of the reproduction position from the attachment / detachment position (not shown)
2 is closed when it is displaced to the first position displaced in the direction, that is, the position shown in FIG. 2, and is opened when it is displaced to the second position displaced further in the direction of arrow A, that is, the position shown in FIG. Have been.

FIGS. 4 and 5 show an opening / closing mechanism of the switch 10 described above. The switch 10 has a first contact piece 10a and a second contact piece 10b and the first contact piece 10b. The contact portion 10c is formed on the piece 10a. 1
1 is a rib formed on the lower surface of the tray 3,
When the tray 3 is between the first position and the second position, the tray 3 has a function of pressing the contact portion 10c of the switch 10 and bringing the first contact piece 10a into contact with the second contact piece 10b. ing.

In such a configuration, the relationship between the position of the photosensor 9 and the opening / closing operation of the switch 10 is as follows. When the tray 3 is displaced from the attachment / detachment position to the first position, the switch 10 is closed as described above. At this time, the photo sensor 9 detects the disc placed on the second video disc It is at the position where the presence or absence of the disk is detected. When the tray 3 is displaced from the first position to the second position, the switch 10 is opened as described above. At this time, the photo sensor 9 detects the disc placed on the second CD disc It is at the position where the presence or absence of the disk is detected.

In this configuration, the operation of detecting the presence / absence of a disk by the photo sensor 9 is performed when the switch 10 is switched, that is, when the switch is switched from the open state to the closed state, and when the switch is closed. It is configured to be performed when the state is switched from the formed state to the opened state.

Reference numeral 12 denotes a pickup for reading out a signal recorded on the disk, and is configured to be displaced in the directions of arrows A and B by the rotating force of the electric motor. Reference numeral 13 denotes a tilt sensor attached to the pickup 12 so as to move together with the pickup 12, and has a function of detecting a tilt of the video disk during a reproducing operation and performing a tilt servo operation. The tilt sensor 13 is configured to function as a sensor for detecting the presence / absence of the disk when the disk is clamped on the turntable 2.

In the above-described configuration, while the tray 3 is displaced from the attachment / detachment position to the reproduction position, an operation of discriminating the disc type, that is, whether the disc is a video disc or a CD disc, is performed. It is configured to move to a predetermined position of each disk, that is, a position of a lead-in area.

The disk detecting device of the present invention is constructed as described above. Next, the detecting operation will be described with reference to the flowchart shown in FIG.

In a state where the tray 3 is displaced to a mounting / dismounting position where the disk is mounted / dismounted, a video disk or a CD disk is mounted on the disk mounting portions 4, 5, 6 or 7 formed on the tray 3. . In such a state, when the operation of displacing the tray 3 to the reproduction position where the reproduction operation is performed is performed, the tray 3 is moved in the direction of the arrow A by the rotating force of the electric motor or the like (step A).

When the tray 3 moves in the direction of arrow A, as shown in FIG.
4, the rib 11 formed on the tray 3 comes into contact with the contact portion 10c of the first contact piece 10a constituting the switch 10 as shown in FIG.
The switch 10 is closed (Step B) in order to displace 0c.

When the switch 10 is closed, the operation of detecting the presence / absence of a disk is performed by the photo sensor 9 (step C). Here, if it is detected that there is a disc, the photo sensor 9 detects that there is a disc in the second video disc mounting portion 5, so that the disc placed on the tray 3 is either a large-diameter video disc or a small-diameter video disc. It is determined that the disc is a video disc, that is, a video disc.

When it is determined that the disk placed on the tray 3 is a video disk, the pickup 12 is moved to a predetermined position of the video disk, that is, the position of the lead-in area (step D). Such a pickup 1
When the moving operation of No. 2 is performed, the moving operation of the tray 3 to the reproduction position is continuously performed.

When the tray 3 is displaced to the reproduction position, the disk is clamped on the turntable 2 by the clamping operation of the clamp member (step E). When the disk is clamped on the turntable, the pickup 12 is moved to a predetermined position on the video disk, and the presence / absence of the disk is detected by the tilt sensor 13 attached to the pickup 12. (Step F).

If it is detected that a disk is present, it is determined that the operation of discriminating the type of the disk has been correctly performed, and the operation of reading a signal recorded on the disk is started (step G).

If it is determined in step F that there is no disk, it is determined that the operation of determining the type of the disk has been performed erroneously, and the pickup 12 is moved to a predetermined position of the CD disk, that is, the position of the lead-in area. (Step H).

When the moving operation of the pickup 12 is completed, the presence / absence of the disk is detected by the tilt sensor 13 (step I). If it is detected that there is a disc, the disc placed on the tray 3 is determined to be a CD disc, and the operation of reading a signal recorded on the disc is started (step J).

If it is determined in step I that there is no disk, it is determined that all the disks are not placed on the tray 3 (step K). Therefore, in this case, since there is no disk, the rotation driving operation of the turntable 2 and the signal reading operation by the pickup 12 are not performed.

The operation when the presence of a disk is detected in step C is performed as described above. Next, the operation when the absence of a disk is detected will be described.

When the tray 3 moves in the direction of arrow A from the position shown in FIG. 2 and is displaced to the second position shown in FIG.
As shown in FIG. 7, the rib 11 formed on the tray 3 is separated from the contact portion 10c of the first contact piece 10a constituting the switch 10, so that the switch 10 is opened (step L).

When the opening operation of the switch 10 is performed, the operation of detecting the presence / absence of the disk by the photo sensor 9 is performed (step M). Here, if it is detected that there is a disk, the photo sensor 9 detects that there is a disk in the second CD disk mounting portion 7, and the disk mounted on the tray 3 is either a large-diameter CD disk or a small-diameter CD.
It is determined that the disk is a D disk, that is, a CD disk.

The disc placed on the tray 3 is a CD
If it is determined that the disc is a disc, the pickup 12 is inserted into a CD.
The disc is moved to a predetermined position, that is, the position of the lead-in area (step N). When the movement of the pickup 12 is performed, the movement of the tray 3 to the reproduction position is continuously performed.

When the tray 3 is displaced to the reproduction position, the disk is clamped on the turntable 2 by the clamping operation of the clamp member (Step O). When the disk is clamped on the turntable, the pickup 12 is moved to a predetermined position on the CD disk, and the operation of detecting the presence / absence of the disk by the tilt sensor 13 attached to the pickup 12 is performed. (Step P).

If it is detected that a disc is present, it is determined that the disc type discriminating operation has been correctly performed, and the reading operation recorded on the disc is started (step J).

If it is determined in step P that there is no disc, it is determined that the disc type discrimination operation has been performed erroneously, and the pickup 12 is moved to a predetermined position on the video disc (step Q).

When the movement of the pickup 12 is completed, the presence / absence of the disc is detected by the tilt sensor 13 (step R). Here, if it is detected that there is a disk, it is determined that the disk placed on the tray 3 is a video disk, and a reading operation of a signal recorded on the disk is started (step G).

If it is determined in step R that there is no disk, it is determined that all the disks are not placed on the tray 3 (step S). Therefore, in this case, since there is no disk, the rotation driving operation of the turntable 2 and the signal reading operation by the pickup 12 are not performed.

The operation when the presence of a disk is detected in step M is performed as described above. Next, the operation when the absence of a disk is detected will be described.

When it is detected that there is no disk when the tray 3 is at the second position shown in FIG. 3, it is determined that all the disks are not placed on the tray 3 (step T). Therefore, in this case, the tray 3 is displaced to the reproduction position, but since there is no disk, the turntable 2 is displaced.
, The moving operation of the pickup 12, and the signal reading operation by the pickup 12 are not performed.

In this embodiment, when the tray 3 is located between the first position shown in FIG. 2 and the second position shown in FIG.
Although the switch 10 is configured to be in the closed state, the switch 10 may be configured to be in the open state. Also,
When the tray 3 is displaced from the mounting position to the first position, the switch 10 is closed and when the tray 3 is displaced to the second position, the switch 10 is opened. Each of the projections is provided so that when the tray 3 is displaced to the first position and the second position, the switching operation of the switch 10, that is, the opening-closing-opening operation or the closing-opening-closing operation is performed. You can also.

[0040]

The disc detecting device of the present invention switches between the first position and the second position when the tray on which the disc mounting portion on which the disc is mounted is formed is displaced from the loading / unloading position to the reproduction position. A switch for performing the operation and a photo sensor for detecting the presence or absence of the disk when the switch is switched are provided, and the type of the disk is determined by the detection operation by the photo sensor while the tray is displaced from the mounting position to the reproducing position. Since the pickup is moved to a predetermined position of the disc detected when the disc is clamped at the reproduction position, and the presence or absence of the disc is detected by a tilt sensor provided to move with the pickup, It is possible to quickly detect whether or not the disc type has been correctly determined. In addition, the present invention performs the operation of detecting the presence or absence of a disc by a tilt sensor by moving the pickup to a predetermined position of the detected disc when the disc is clamped at the playback position, and determining that there is no disc. In this case, the pickup is moved to a predetermined position of a different type of disk, and the operation of detecting the presence or absence of the disk by the tilt sensor is performed again. Therefore, even if the operation of determining the type of the disk is not performed correctly, the disk can be reproduced. Not only can the operation be performed promptly, but also the operation for useless reproduction can be prevented.

[0041]

[0042]

[Brief description of the drawings]

FIG. 1 is a flowchart for explaining a disk detection operation of the present invention.

FIG. 2 is a plan view of a main part showing a state in which a tray is at a first position displaced from a detachable position toward a reproduction position.

FIG. 3 is a plan view of a main part showing a state where a tray is at a second position displaced from a first position toward a reproduction position.

FIG. 4 is a side view of a main part showing a relationship between the tray and a switch when the tray is at a first position.

FIG. 5 is a side view of a main part showing a relationship between the tray and a switch when the tray is at a second position.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Disc player body 2 Turntable 3 Tray 9 Photosensor 10 Switch 12 Pickup 13 Tilt sensor

Claims (2)

(57) [Claims] 1. A disk mounting portion which is provided so as to be displaceable between a mounting / dismounting position at which a disk mounting / dismounting operation is performed and a reproducing position at which a disk reproducing operation is performed, and wherein a disk mounting portion on which a video disk and a CD disk are mounted is concentric. comprising a tray formed in Jo, and in the disc player with a tilt sensor that moves with pickup for reading a signal recorded on the disc, the tray is worn
A first position displaced from the release position toward the reproduction position and the first position;
From the position to the second position which is further displaced toward the playback position.
Switch that performs the switching operation when the
Is installed in the movement path of all the disks
When the switching operation of the switches is performed,
And a photo sensor that detects the presence or absence of
When the ray is displaced from the attach / detach position to the playback position,
On the tray by the detection signal obtained from the sensor.
Detects the type of disc that is
The disc moves to the playback position with the displacement of the ray to the playback position.
Predetermined position of disc detected when clamped to
Wherein the pickup is moved to detect the presence / absence of the disk by the tilt sensor. 2. A disk mounting portion which is provided so as to be displaceable between a mounting / dismounting position for performing a disk mounting / dismounting operation and a reproducing position for performing a disk reproducing operation, and wherein a disk mounting portion on which a video disk and a CD disk are mounted is concentric. comprising a tray formed in Jo, and in the disc player with a tilt sensor that moves with pickup for reading a signal recorded on the disc, the tray is worn
A first position displaced from the release position toward the reproduction position and the first position;
From the position to the second position which is further displaced toward the playback position.
Switch that performs the switching operation when the
Is installed in the movement path of all the disks
When the switching operation of the switches is performed,
And a photo sensor that detects the presence or absence of
When the ray is displaced from the attach / detach position to the playback position,
On the tray by the detection signal obtained from the sensor.
Detects the type of disc that is
The disc moves to the playback position with the displacement of the ray to the playback position.
Predetermined position of disc detected when clamped to
Moved the pickup, the I more than Chirutose
The presence / absence of a disc with a sensor
When the pickup is detected, the pickup is
To the predetermined position on the disc and the tilt
A disc detecting device for a disc player, wherein the presence / absence of a disc is detected again by a sensor.