JP2536617Y2 - Optical pickup fixing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial application field The present invention is to fix an optical pickup used to read out a signal from a disk in order to protect the optical pickup from shock during transportation. Related to the device.

(B) Conventional technology An optical disk player records light on a disk by irradiating a signal surface of the disk with a light beam projected from an optical pickup and detecting a light beam reflected from the signal surface with a photodetector. It is configured to perform a reading operation of the signal that has been performed. The optical pickup described above is supported by two guide rails provided on a chassis so as to be capable of sliding displacement in the radial direction of the disc, and detects displacement of light reflected from the disc surface. It is configured to be slid on the guide rail by a controlled linear motor or the like.

In the operation of reading a signal recorded on a disk by an optical pickup, it is necessary to accurately irradiate a light beam emitted from the optical pickup onto a track recorded on the disk. In order to perform such an operation, the optical pickup is configured such that the displacement of the objective lens incorporated in the optical pickup is controlled in the direction of the disk surface and in the direction of following the track of the disk.

In such an optical disc player, there is a problem that the optical pickup is damaged when subjected to a shock during transportation of the product. Therefore, the optical pickup is fixed at the time of transportation. -140425
Is described in Japanese Patent Application Publication No. According to such a technique, an optical pickup is fixed by providing a lock member having a tapered portion formed at the distal end portion rotatably on a chassis, and abutting the distal end portion of the lock member on a support member supporting the optical pickup. It is configured to be.

(C) Problems to be Solved by the Invention As described above, in the prior art, the tip of the abutment is brought into contact with the support member, the support member is displaced upward, and the locking piece and the guide rail are brought into contact with each other to make the light The pickup is fixed. Therefore, the lock member must be rotated by hand to fix the optical pickup during transportation, and the lock member must be rotated in the opposite direction during use, which is troublesome.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned drawbacks, and provides an optical pickup fixing device which is automatically locked when a power switch is turned off for transportation or the like.

(D) Means for Solving the Problems The fixing device of the present invention comprises an optical pickup which is moved in a direction crossing a track formed on a disk by a driving operation of a linear motor, and a power switch which is turned on. A charging / discharging circuit that supplies a drive current to the linear motor to move the optical pickup to a predetermined position when the switch is switched to an off state in a charged state, and the optical pickup moves to the predetermined position. When it is moved, it is constituted by a solenoid which is excited by a drive current supplied from the charge / discharge circuit and moves a lock pin for locking the optical pickup at a predetermined position to a lock position.

(E) Function In the present invention, when the power switch is switched from the on state to the off state, the optical pickup is moved to a predetermined position, and the optical pickup is automatically locked and fixed by the movement of the lock pin by the excitation of the solenoid. It is something to do.

(F) Embodiment An embodiment of the optical pickup fixing device of the present invention will be described with reference to the drawings.

In the figure, (1) is a linear motor and an outer yoke (2)
Is provided with a magnet (3) inside thereof, and a coil (5) is slidably mounted on the inner yoke (4). (6) a supporting member for supporting the optical pickup (7), which is connected to the coil (5) by a connecting rod (8) and slidably mounted on guide rails (9) (9) arranged in parallel. Further, a lock hole (10) is formed in the support member (6). (11) is an open / close switch which is turned on by contacting the support member (6) when the optical pickup (7) is positioned on the innermost track of a disk (not shown), and (12) is the lock This is a bistable solenoid having a lock pin (13) fitted in the hole (10), and is provided in a case (14) as shown in FIG.
A set of coils (15), (15), a magnetic body (16) provided to be slid in the coils (15), (15) and having the lock pin (13) attached thereto, and a case (14) Permanent magnets (17) and (18) provided opposite to the magnetic body (16) at both ends
And

FIG. 4 is a circuit diagram for controlling the movement operation of the pickup (7) and the operation of the solenoid (12) which constitute the present invention. In the figure, reference numeral (19) denotes a motor drive signal generation circuit which generates a motor drive signal for slidingly displacing the optical pickup (7) based on a signal obtained by a signal reading operation by the optical pickup (7). It is configured as follows. (20) is a low-pass filter for removing high-frequency components of the motor drive signal, the output of which is applied to the coil (5) of the linear motor (1). (twenty one)
Is a charge / discharge circuit. When the power switch (22) linked to the main switch is turned on, the voltage from the battery (23) is charged. When the power switch (22) is turned off, the battery is discharged. Is supplied to the coil (5). (2
4) a switch circuit connected to the charging / discharging circuit (21) via an open / close switch (11); a first transistor (25) turned on by a discharging voltage of the charging / discharging circuit (21);
It is turned on by the transistor (25) and the third transistor (2
And 7) a second transistor (26) for turning on.
(28) is a release signal generation circuit that generates a release signal when the main switch is turned on.

Next, the operation of the optical pickup fixing device of the present invention will be described.

When the main switch is turned on to put the disk player into an operating state, a release signal is generated from the release signal generation circuit (28), and a drive current is supplied to the coils (15) and (15) constituting the solenoid (12). , Magnetic material (1
6) is excited as shown in FIG. As is apparent from FIG. 3, when the magnetic body (16) is excited, the N pole of the permanent magnet (17) and the N pole of the magnetic body (16) face each other.
The magnetic body (16) receives the repulsive force and is displaced in the direction of arrow A. When the magnetic body (16) is displaced in the direction of arrow A, the N pole of the permanent magnet (18) and the S pole of the magnetic body (16) face each other. Upon receiving the force, it is displaced in the direction of arrow A and is held in a state displaced to the opposite side of the state shown in the figure. As a result of this operation, the lock pin (13) to which the magnetic body (16) is attached is displaced from the lock position where the lock hole (10) is fitted to the non-lock position which is the non-fit position. The support member (6) is slidable, that is, free. When the support member (6) is released,
A light beam emitted from the optical pickup (7) and reflected by the disk is detected by a photodetector, and a motor is provided according to the difference between the current address of the optical pickup (7) and the address of the target track. A motor drive signal is generated from a drive signal generation circuit (19), and the motor drive signal is applied to a coil (5) of the linear motor (1) and is applied between a current flowing through the coil (5) and the magnet (3). The generated magnetic force moves the coil (5) in the direction of the arrow (C), whereby the support member (6) connected to the coil (5) by the connecting rod (8) moves from the inner circumference to the outer circumference of the disk. Move. When the support member (6) moves and the optical pickup (7) is positioned on the target track, a small signal is taken out from the motor drive signal generation circuit (19), and the small signal is output to the optical pickup (7). A tracking coil is applied to track the light beam so as to accurately irradiate the target track. In this way, during reproduction, the lock pin (13) is not locked in the lock hole (10) of the support member (6), and the optical pickup (7) is freely moved in the radial direction of the disk by the linear motor (1). You.

When the main switch is turned off in order to transport the CD player, the power switch (22) is turned off, whereby the charge previously charged in the charge / discharge circuit (21) is discharged, and the coil (5) of the linear motor (1) is discharged. ) To forcibly move the coil (5) in the direction of the arrow (D) to position the optical pickup (7) on the innermost track. When the optical pickup (7) is positioned on the innermost track, the support member (6) hits the open / close switch (11), and the open / close switch (11) is turned on. When the open / close switch (11) is turned on, the discharge voltage of the charge / discharge circuit (21) is supplied to the base of the first transistor (25) via the open / close switch (11) to turn on the first transistor (25). When the first transistor (25) is turned on, the second transistor (26) and the third transistor (27) are turned on, and the discharge voltage of the charge / discharge circuit (21) is changed to the third transistor (27).
Are applied to the coils (15) and (15) through the emitter and collector. Since the polarity of the discharge voltage is opposite to the voltage supplied to the coils (15) and (15) during the release operation described above, the magnetic body (16) is excited to the polarity opposite to the polarity shown in FIG. That is, the magnetic body (16) receives a repulsive force from the permanent magnet (18) and is displaced in the direction of arrow B. When the magnetic body (16) is displaced in the direction of arrow B, the magnetic body (16) is attracted by the permanent magnet (17), so that the magnetic body (16) is displaced and held at the position shown in FIG. . As a result of this operation, the lock pin (13) to which the magnetic body (16) is attached is displaced to the lock position where the lock pin (10) is fitted to the lock pin (10), and the support member (6)
Is locked.

After the magnetic body (16) is displaced to the position where the support member (6) is locked and held, the discharge voltage supplied from the charging / discharging circuit (21) disappears. 3), the lock pin (13) is held at the position shown in FIG.
The optical pickup (7) can be locked and held at a predetermined position without coming off from the lock hole (10).

(G) Effect of the Invention In the present invention, when the power switch is turned off, the optical pickup is displaced to a predetermined position and then locked, so that a special locking operation is performed when the disc player is moved. It is very convenient without having to do.

The present invention also provides a charging / discharging circuit which is charged when the power switch is on, and when the power switch is turned off, the discharge voltage of the charging / discharging circuit causes the optical pickup to move to a predetermined position. The drive operation of the solenoid that performs the displacement operation of the optical pickup and the lock operation of the optical pickup is performed, so that the lock operation can be reliably performed even in a disc player that uses a battery as a power supply.

[Brief description of the drawings]

FIG. 1 is a plan view of an optical pickup fixing device of the present invention,
FIG. 2 is a perspective view of the fixing device of the present invention, FIG. 3 is a sectional view of the plunger used in the present invention, and FIG. 4 is a circuit diagram used in the present invention. Description of main drawing numbers (1) ... linear motor, (6) ... support member, (7)
…… Optical pickup, (10)… Lock hole, (11) ……
Open / close switch, (12) Solenoid, (21) Charge / discharge circuit, (22) Power switch.

Claims (1)

(57) [Scope of request for utility model registration] 1. A linear motor provided so that a mover moves straight, an optical pickup moved in a direction crossing a track formed on a disk by a driving operation of the linear motor, and a power switch turned on. A charging / discharging circuit that supplies a drive current to the linear motor to move the optical pickup to a predetermined position when the power switch is turned off and the power pickup is moved to a predetermined position when the power switch is turned off; An open / close switch that is turned on when moved to a predetermined position, and a lock pin that is excited by a drive current supplied from the charge / discharge circuit when the open / close switch is turned on and locks the optical pickup at a predetermined position. An optical pickup fixing device consisting of a solenoid that moves to the lock position.