JPH0373956B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an optical system for recording or reproducing information by condensing a laser as a light source onto a recording track formed on a disk-shaped recording medium (hereinafter referred to as a disk). The present invention relates to a locking device for an optical head transfer table used in a recording/reproducing apparatus.

Conventional configuration and its problems When transporting an optical recording/reproducing device, if the transfer table is not locked, the optical head attached to the transfer table will move through its movable range due to vibrations, causing the optical recording/reproducing device to be fixed. Conventionally, a locking device for an optical head transfer table has been regarded as important because it can damage the optical system or cause its adjustment to go out of order.

Hereinafter, a conventional locking device for an optical head transfer table will be explained with reference to FIG.

FIGS. 1A and 1B are plan views of a conventional locking device for an optical head transfer table. In FIG. 1, direction A is the radial direction of the disk. Reference numeral 1 denotes an optical head that focuses light onto a disk (not shown) to record or reproduce information. Reference numeral 2 denotes a transfer table, on which the optical head 1 is attached, and is adhesively fixed to a moving coil (not shown) of a linear motor (not shown) that generates thrust in the radial direction A of the disk. 3 is a shaft whose axis is parallel to A in the radial direction of the disk. A roller 4 is attached to the transfer table 2, rotates on the shaft 3, and guides the transfer table 2 and thus the optical head 1 in the disk radial direction A. Reference numeral 5 denotes a stopper, at which the optical head 1 abuts against the transfer table 2 at a position beyond the recording/reproducing area of the disk;
It is an elastic thing that regulates its movement. Reference numeral 6 denotes a locking member, which has a hole slightly larger in diameter than the diameter of the shaft 3, is inserted into the shaft 3, and is movable in the disk radial direction A. 7 is a metal part of the lock member 6. Reference numeral 8 denotes a female thread, which is bored in the metal portion 7 of the locking member 6 in order to screw and fix the locking member 6 to the main body of the optical recording/reproducing apparatus (not shown). Reference numeral 9 denotes an elastic portion of the locking member 6, which is adhesively fixed to the metal portion 7 of the locking member 6 and comes into contact with the transfer table 2 when the locking member is locked. Reference numeral 10 denotes a side plate to which the shaft 3 is fixed, a protrusion is provided on the side of the locking member 6, and a stopper 5 is adhesively fixed to the protrusion and a position opposite to the protrusion, and is fixed to the main body of the optical recording/reproducing apparatus.

In the above configuration, FIG. 1A shows the state of the locking device of the optical head transfer table when the optical recording/reproducing device is not being transported, and the locking member 6 is in contact with the side plate 10 when the optical recording/reproducing device is not transported. The optical head 1 is fixed to the main body of the reproducing apparatus with screws 8, and is in a state in which it can freely move within the recording/reproducing area of the disk.

On the other hand, FIG.
The transfer table 2 is brought into contact with a stopper 5 fixed to a side plate 10 without a protrusion, and the lock member 6 is fixed to the main body of the optical recording/reproducing apparatus with a female screw 8 at a position where it is brought into contact with the transfer table 2. The optical head 1 is therefore in a locked state.

Incidentally, recently there has been a strong tendency for optical recording and reproducing devices to have a sealed structure to prevent dust. However, with the above configuration, the optical recording/reproducing device is opened before and after transportation, and there is a high risk that dust will enter the inside.

Furthermore, in order to make it ready for transport or use, the optical recording/reproducing device is opened, the screws of the locking member are removed, the locking member or the transfer table is moved to a predetermined position, and the locking member is placed into the optical recording/reproducing device. It was necessary to perform the troublesome operation of screwing the optical recording and reproducing device back into the sealed state by screwing it into the main body of the device.

Purpose of the Invention The present invention has been made in view of the above-mentioned prior art, and is capable of locking and unlocking the transfer table at any position in conjunction with the power supply of the optical recording/reproducing device. Since the optical recording and reproducing device can be made into a sealed structure, it is possible to prevent dust from entering the optical recording and reproducing device during transportation, and furthermore, it eliminates the need to lock or unlock the transfer platform during transportation. The present invention provides a locking device for an optical head transfer table that can be used to transport an optical head.

Structure of the Invention A locking device for an optical head transfer table according to the present invention includes a transfer table on which an optical head is disposed, a transfer means for transferring the transfer table in the disk radial direction, and one lock pin provided on the transfer table. The lock lever includes a lock lever having a plurality of concave portions continuous in the disk radial direction that can be locked with the lock pin, and a lock lever driving means for moving the lock lever between the locked state and the non-locked state of the lock lever and the lock pin. Ru.

By interlocking this lock lever drive means with the power supply of the optical recording and reproducing device at any position on the transfer table, and setting it in the locked state when the power is OFF and in the unlocked state when the power is ON, the optical recording and reproducing device can be made into a sealed structure. Therefore, it is possible to prevent dust from entering the optical recording/reproducing apparatus during transportation, and also to eliminate the need to lock or unlock the transfer platform.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 2 and 3.

2 and 3 are perspective views of a locking device for an optical head transfer table according to an embodiment of the present invention, with FIG. 2 showing the locked state and FIG. 3 showing the unlocked state. In FIGS. 2 and 3, the B direction is the disk radial direction. The C direction is a direction perpendicular to the B direction. Reference numeral 11 denotes a transfer table, which is equipped with an optical head (not shown) and is adhesively fixed to a moving coil (not shown) of a linear motor (not shown). (not shown) and a shaft (not shown) in the direction B. Reference numeral 12 denotes a lock pin, and only one pin engages with a hole provided in the transfer table 11 and is fixed by adhesive. Reference numeral 13 denotes a lock lever, which is provided with a plurality of V-shaped grooves that can be engaged with the lock pin 12 and are continuously provided in the B direction. 14 is a lock lever guide, and a portion 14a in the figure is press-fitted into a hole provided in the main body of the optical recording/reproducing apparatus (not shown). Reference numeral 15 denotes a lock lever guide elongated hole, which is provided in the lock lever 13 so as to engage with a portion 14b in the figure of the lock lever guide 14 so that the lock lever 13 can move in the C direction. Reference numeral 16 denotes a lever drive pin elongated hole, which is provided in the lock lever 13 so that the lock lever 13 can move in the B direction. Reference numeral 17 denotes a solenoid body, which is fixed to the main body of the optical recording/reproducing device. Reference numeral 18 denotes a solenoid core, which has a groove provided in the radial direction on its end face, and a through hole provided perpendicularly to the groove. 19 is a lever drive arm, which is L-shaped. Reference numeral 20 denotes a solenoid pin elongated hole, which is provided in the C direction of the lever drive arm 19. Reference numeral 21 designates a solenoid pin, and when the part of the lever drive arm 19 with the solenoid pin elongated hole 20 is inserted into the groove of the solenoid core 18, the solenoid pin elongated hole 20 of the lever drive arm 19 is inserted into the through hole provided in the solenoid core 18 and the solenoid pin elongated hole of the lever drive arm 19. 2
0 and is fixed to the solenoid core 18. Reference numeral 22 denotes a lever drive pin, and a portion 22a in the figure is engaged and fixed in a hole provided in the lever drive arm 19, and a portion 22b in the figure is engaged with the elongated lever drive pin hole 16 of the lock lever 13. Reference numeral 23 denotes a lever drive shaft, a portion 23a in the figure is rotatably inserted into the main body of the optical recording/reproducing device, and a portion 23b in the figure is fixed to a hole provided in the lever drive arm 19. A solenoid return spring 24 is inserted into the solenoid core 18 to return the solenoid core 18 to its original state (locked state) when the power to the solenoid body 17 is turned off.

The operation of the locking device for the optical head transfer table constructed as described above will be explained below.

First, when the power to the solenoid main body 17 is turned off (see FIG. 2), the solenoid pin 21 is located on the D side of the solenoid pin elongated hole 20 of the lever drive arm 19 in the figure, and the lever drive pin 22 is located on the side D in the figure of the solenoid pin long hole 20 of the lever drive arm 19. The three lock lever guides 14 are located on the F side in the figure of the lever drive pin elongated hole 16, and the three lock lever guides 14 are located on the three lock lever guide elongated holes 15 of the lock lever 13.
It is located on the E side in the figure. In this state, the V-shaped groove of the lock lever 13 and the lock pin 12 are in a locked state, and the transfer table 11 is locked.

Next, when the power of the solenoid body 17 is turned on (see FIG. 3), the solenoid core 18 is struck by the force of the solenoid return spring 24 and the solenoid body 1
7 is attracted. For this reason, lever drive arm 1
9 rotates slightly around the lever drive shaft 23 as a fulcrum;
As a result, the solenoid pin 21 is located on the E side of the solenoid pin elongated hole 20 of the lever drive arm 19 in the drawing. At the same time, the lever drive pin 22 becomes the G side in the figure of the lever drive pin long hole 16 of the lock lever 13, and the three lock lever guides 14 become the D side of the three lock lever guide long holes 15 of the lock lever 13 in the figure. So, the lock lever 13 moves,
V-shaped groove of lock lever 13 and lock pin 12
and separate. In other words, the lock is released.

Then, when the power to the solenoid body 17 is turned off again, the restoring force of the solenoid return spring 24 causes the state shown in FIG. 3 (unlocked state) to return to the state shown in FIG. 2 (locked state).

The V-shaped groove provided in the lock lever 13 is provided over the entire movable range of the optical head (transfer table 11), so that the optical head can be locked at any position.

Further, the power source of the solenoid body 17 is linked to the power source of the optical recording/reproducing device body.

As described above, according to this embodiment, the optical recording and reproducing device can be made into a sealed structure, which prevents dust from entering the optical recording and reproducing device during transportation, and furthermore, locks the transfer platform during transportation. This eliminates the need for operations such as unlocking or unlocking. In addition, in order to speed up the operation of moving the optical head in the radial direction of the disk in order to record or reproduce information at a desired position on the disk, it is necessary to reduce the weight of the movable parts such as the optical head and the transfer stage. It is very important to improve vibration characteristics.

However, if the structure of the moving parts such as the transfer table is complicated in order to lock and unlock the transfer table, the mass of the moving parts becomes significantly large and the vibration characteristics of the moving parts deteriorate significantly. Resulting in.

However, in this embodiment, since only one pin is provided in the movable part, the structure of the movable part is hardly complicated, and therefore, it hardly causes an increase in the mass of the movable part or deterioration of the vibration characteristics. You can lock and unlock the transfer platform without having to worry about it.

In this embodiment, the recess that can be engaged with the lopping pin is a V-shaped groove, but the same effect can be obtained by using a U-shaped groove, for example.

Effects of the Invention As described above, the locking device for the optical head transfer table according to the present invention locks the lock lever, which has a plurality of concave portions continuous in the disk radial direction, which can lock with the lock pin provided on the transfer table. The optical recording and reproducing device can be driven in both the locked state and the unlocked state, and can be locked at any position on the transfer stage, and furthermore, by interlocking this lock lever driving means with the power supply of the optical recording and reproducing device main body. Since the structure can be sealed, it is possible to prevent dust from entering the optical recording/reproducing apparatus during transportation, and furthermore, it is possible to eliminate the need for locking and unlocking the transfer platform. Furthermore, since only one pin is provided on the movable part, the structure of the movable part is hardly complicated. can be locked or unlocked.

[Brief explanation of drawings]

1 is a plan view of a locking device of a conventional optical head transfer stand (A is an unlocked state, B is a locked state), and FIG. 2 is a plan view of a locking device of an optical head transfer stand in an embodiment of the present invention. FIG. 3 is a perspective view of the device in the locked state, and FIG. 3 is a perspective view of the device in the unlocked state. 11...transfer table, 12...lock pin, 13...
…Lots Clever.

Claims (1)

[Claims] 1. A transfer table provided with an optical head for recording or reproducing information signals on a disk-shaped recording medium, a transfer means for transferring the transfer table in the radial direction of the disk-shaped recording medium, and a transfer table provided on the transfer table. A lock lever including one lock pin and a plurality of recesses that can be engaged with the lock pin continuously provided in the radial direction of the disk-shaped recording medium, and a lock lever that allows the lock lever and the lock pin to be in both a locked state and an unlatched state. 1. A locking device for an optical head transfer table, comprising: a locking lever driving means for moving the locking lever in the locked state.