JPH0722758Y2 - Disc player - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a disc reproducing apparatus in which a plurality of discs are set on a rotary table and the trays are ejected during reproduction so that the discs can be exchanged. It is intended to prevent a track jump or the like from being inadvertently generated when the tray is ejected or stored while the disc is being reproduced.

[Prior Art] Conventionally, there is known a disc reproducing apparatus in which a rotary table is placed on a tray and a plurality of discs are simultaneously set so that continuous reproduction can be performed. In this type of conventional disc reproducing apparatus, a rotary table is rotatably mounted on a tray, and when the tray is stored in the reproducing apparatus main body with a disc placed on the rotary table,
The rotary table rotates and one disc holding portion is positioned on the turntable. Then, the turntable and the reproducing head are raised and the disc is pulled up from the disc holding portion by the turntable and clamped. In this state, the disc can be rotated and reproduced by the reproducing head. In the case of continuous reproduction, when the reproduction of one disc is completed, the turntable is lowered, the disc is returned to the disc holding portion on the turn disc, and the rotary table is rotated to position the disc on the next disc holding portion. The disc held there is set on the turntable and similarly reproduced.

According to this conventional disc reproducing apparatus, the reproduction must be stopped when the disc is exchanged, and the disc cannot be exchanged by ejecting the tray while reproducing the disc.

Therefore, as a disc reproducing apparatus which solves such a problem and enables the disc to be exchanged by ejecting the tray while reproducing the disc, a description is given in Japanese Patent Application No. 1-124681. Disc playback devices have been proposed.

This is a tray that moves with respect to the main body of the apparatus to be stored and ejected, a rotary table that is rotatably attached to the tray, and a plurality of disk holding units that are formed around the rotary shaft on the rotary table. A turntable, a disc clamper, and a reproducing head provided separately from the tray in the main body of the apparatus, a notch in which the disc holding portion is formed so that the turntable and the reproducing head can be inserted, and the tray. A disk holding mechanism for setting a disk held in one of the disk holding portions on the turntable in a state where the disk is housed in the apparatus main body and clamping the disk by the disk clamper; An opening formed in the tray so as to communicate with the cutout of the portion,
When the discharge operation of the tray is performed in the disc reproducing state, the turntable and the reproducing head can be removed through the notch of the disc holding portion and the opening portion of the tray so that the tray can be ejected.

According to this, when the tray ejection operation is performed in the disc playback state, the tray can be ejected by removing the turntable and the playback head through the notch of the disc holding portion and the opening of the tray. The tray can be ejected and the disc can be replaced while performing.

[Problems to be Solved by the Invention] In the disc reproducing apparatus capable of disc conversion in the disc reproducing state, the tune being played may cause a track jump due to the impact of the tray discharging and storing operations.

This invention solves the above-mentioned drawbacks of the prior art, and provides a disc reproducing apparatus which prevents a song being played from causing a track jump or the like due to an impact at the time of ejecting or storing a tray. .

[Means for Solving the Problems]

This invention is designed to increase the pickup servo loop gain when the tray is stored or ejected in a disc reproducing state.

[Action]

According to this invention, the pickup servo loop gain is increased when the tray is stored or ejected in the disc reproducing state, so that the music being played is affected by the impact of the disc storing or ejecting operation. Can be prevented from causing a track jump or the like.

Note that if the pickup servo loop gain is constantly increased, the amount of heat generated by the coil may increase, the mechanical noise of the actuator may become loud, or the actuator drive current may be disturbed, which may affect the music signal. In the present invention, since the loop gain is increased when the tray is stored or ejected, such inconvenience can be minimized because the normal loop gain is restored during normal reproduction.

〔Example〕

An embodiment of this invention will be described below. First, FIG. 2 shows an example of a mechanical portion of a disc reproducing apparatus to which the present invention is applied, which is described in Japanese Patent Application No. 1-124681. The tray 26 is moved in the direction of arrow A by the motor drive with respect to the reproducing apparatus main body 28, and is accommodated and discharged. Tray 26
A rotary table 30 is mounted on the upper part of the table so as to be rotatable in the direction of arrow B by a motor drive. On the rotary table 30, a plurality of (five in this case) disk holding portions 34 for holding the disks 1 are formed around a rotation center 32. Here, the disc holding portion 34 has a groove 34a for a 12 cm CD and a groove 34 for an 8 cm CD.
It has b. A notch 36 for inserting a turntable and a reproducing head is formed in the disc holding portion 34 toward the outer peripheral direction of the rotary table 30. An opening 38 is formed at the center of the rear end of the disc tray 26, and the turntable and the reproducing head are pulled out from the tray 26 while communicating with the notch 36 of the disc holding portion 34 at that position and in the reproducing state. Enables the discharge of.

At the center of the rear end of the mechanical chassis 40 in the playback device body 28, a sub-chassis 42 equipped with a turntable 72 and a playback head (not shown) is driven by a motor under the tray 26 as shown by an arrow C. It is rotatably supported about a rotary shaft 44. A disc clamper 46 is fixedly installed on the mechanical chassis 40 above the tray 26 so as to face the turntable 72.

When the sub-chassis 42 rotates upward with the tray 26 housed in the reproducing device main body 28, the turntable 72 and the reproducing head rise and are inserted into the notches 36 of the disc holding portion 34. As a result, the disc 1 is placed on the turntable 72, pulled up from the disc holding portion 34, and clamped by the disc clamper 46. In this state, the reproducing head can reproduce.

When the sub-chassis 42 is rotated downward while the tray 26 is housed in the reproducing device main body 28, the disc 1 is returned to the disc holding portion 34, and the turntable 72 and the reproducing head are notched.
Pulled down from 36.

When the disc is ejected from the reproducing state, the turntable 72 and the reproducing head are pulled out horizontally from the notch 36 and the opening 38, so that the tray 26 can be pulled out from the reproducing device main body 28 to exchange the disc while continuing the reproduction. it can.

When the disc 26 is replaced and the tray 26 is housed in the reproducing apparatus main body 28, the turntable 72 and the reproducing head are opened.
Inserted in 38 and notch 36. In this way, the disc can be replaced without stopping the reproduction.

Next, FIG. 1 shows an embodiment in which the present invention is applied to the servo device of the disk reproducing device of FIG. The reproducing head 74 is supported by a motor shaft (screw shaft) 78 of a feed motor 76 installed on the sub chassis 42 so as to be movable in the radial direction of the disc 1.

The reproducing head 74 irradiates the disk 1 with the laser light 82 emitted from the laser diode 80 through the beam splitter 84 and the objective lens 86, and reflects the reflected light from the objective lens 86 through the beam splitter 84 into the four-division photodiode 88.
To receive light.

The light reception signal of the four-division photodiode 88 is input to the matrix circuit 92 via the amplifier 90, and an RF signal, a tracking error signal, and a focus error signal are generated respectively. The focus error signal is the focus control circuit 94
To the focus coil 98 in the reproducing head 74 via the servo amplifier 96.
And the focus control is realized.

The tracking error signal is sent to the tracking control circuit 100.
A tracking servo signal is input to the tracking coil 104 in the reproducing head 74 via the servo amplifier 102, and tracking control is realized.

The tracking error signal is also input to the feed control circuit 106 to generate a feed servo signal, which is supplied to the feed motor 76 via the servo amplifier 108 to realize the feed servo.

The focus and tracking servo amplifier 96,102
The variable gain is used. The system controller 110 detects the storage operation and the discharge operation of the tray 26 (the storage command and the discharge command may be detected) and increases the gain of the servo amplifiers 96 and 102. This allows the tray 26
Even if the disk reproducing apparatus receives an impact such as a vibration due to the operation described above, it is possible to prevent the focus servo and the tracking servo from being accidentally disengaged, causing a track jump, or temporarily being in a reproduction disabled state.

When the tray 26 is housed in the reproducing apparatus main body 28 again, the servo loop gain is returned to the normal value.

In addition, if the servo loop gain is increased even when the tray 26 is stopped in the ejected state, a track jump or the like may occur even if the tray 26 is hit by the hand during disc replacement. It becomes difficult to wake up.

[Effect of device]

As described above, according to the present invention, the pickup servo loop gain is increased when the tray is stored or ejected in the disc reproducing state. It is possible to prevent a song being played from causing a track jump due to an impact.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a servo device to which the present invention is applied. FIG. 2 is a perspective view showing an example of a mechanical portion of a disc reproducing apparatus to which the present invention is applied. 1 …… disc, 26 …… tray, 28 …… playback device body,
30 ... Rotary table, 32 ... Rotation center, 34 ... Disc holding part, 36 ... Notch, 38 ... Opening part, 46 ... Disc clamper, 70 ... Disc motor, 72 ... Turntable, 74 ... Playback head, 94 Focus control circuit, 10
0 …… Tracking control circuit, 96,102 …… Variable gain servo amplifier.

Claims (1)

[Scope of utility model registration request] 1. A tray which is moved with respect to the main body of the apparatus to be stored and discharged, a rotary table rotatably attached to the tray, and a plurality of disks formed around a rotary shaft on the rotary table. A holding part, a turntable provided separately from the tray in the main body of the apparatus, a disc clamper and a reproducing head, and a notch formed in the disc holding part so that the turntable and the reproducing head can be inserted, A disk mounting mechanism for setting a disk held in one of the disk holding portions on the turntable in a state where the tray is housed in the main body of the apparatus and clamping the disk by the disk clamper, and A disc playback unit having an opening formed in the tray so as to communicate with the notch of the disc holding unit. In a disc reproducing apparatus capable of ejecting the tray by removing the turntable and the reproducing head through the notch of the disc holding portion and the opening of the tray when the tray is ejected in the state, A disc reproducing apparatus in which a pickup servo loop gain is increased when the tray is stored or ejected in a reproducing state.