JPH0664753B2 - Drive - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a drive device, and more particularly to a reproducing device or a reproducing device for controlling track deviation and focus deviation of a light spot focused on an information recording surface of an optical disc. The present invention relates to an optical device driving device of a recording / reproducing device.

[Conventional technology]

Conventionally, as a driving device for optical means, there is one shown in FIGS. 4 to 6.

In the figure, reference numeral 1 is an objective lens, 2 is a counter weight, 3 is a lens holder having a cylindrical movable bearing 3a,
Reference numeral 4 denotes a spindle, on which the movable bearing 3a is fitted so as to be rotatable in the circumferential direction and slidable in the longitudinal direction. 5 is a supporting rubber for holding the lens holder 3, 6a, 6b are permanent magnets, 7a, 7b, 8
Is a yoke, 9 is a fixed holder, 10 is a focus control coil, 11
a, 11b are track control coils, 12a, 12b are fixing screws, 13
Is a cover, 14 is a coil holder, 15a, 15b, 15c and 15d are lead wires, and 16a, 16b, 16c and 16d are substrates for drawing out coils.

In the drive device having the above-mentioned structure, since the cylindrical movable bearing 3a is fitted on the support shaft 4, the lens holder 3 is slidably supported in the longitudinal direction of the support shaft 4, that is, as shown by an arrow A in FIG. At the same time, it is held rotatably around the support shaft 4 as shown by an arrow B in FIG. Here, focus control can be performed by moving the lens holder 3 in the direction of arrow A by applying a desired current to the focus control coil 10, and the objective lens 1 can be separated from the support shaft 4 by a certain distance and the objective lens 1 can be moved to the coil holder 14. Since it is fixed to, the track control can be performed by causing a desired current to flow through the track control coils 11a and 11b to rotate the objective lens 1 in the arrow B direction.

[Problems to be solved by the invention]

However, according to the conventional drive device, the lead wires 15a to 15d for supplying the current to the focus control coil 10 and the track control coils 11a and 11b are set to the movement amount based on the sliding and rotating of the lens holder 3. It is necessary to lengthen the lead wires 15a to 15d by a corresponding length so that the lead wires 15a to 15d are not caught or fully extended during the controlled movement of the lens holder 3.
Therefore, there is a problem that the lead wires 15a to 15d affect the movement of the lens holder 3 and hinder the control of the lens holder 3.

In addition, since the lead wires 15a to 15d are long, the lead wires 15a to 15d enter the lower side of the objective lens 1 and block a light beam (not shown) to adversely affect reproduction. Alternatively, there is a problem in that the upper yokes 7a, 7b and the like are cut to cause a failure.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a driving device that does not affect the operation of the driving device that controls the lens holder and that does not block the light beam. .

[Means for solving problems]

The feature of the drive device according to the present invention for achieving the above object is that current is supplied to electromagnetic coils such as focus control and track control coils via a conductor integrated with a support shaft. is there.

[Action]

With the above-described configuration, it is possible to supply a current from the outside to the electromagnetic coil through the conductor integrated in the support shaft.

As described above, the operation of the driving device for controlling the lens holder is not disturbed and the light beam is not blocked, which adversely affects the reproducing function of the reproducing device or the recording / reproducing device. In addition, no failure such as cutting of the lead wire occurs.

〔Example〕

Hereinafter, embodiments of a drive device according to the present invention will be described in detail with reference to the drawings. 1 to 3 are for explaining one embodiment of the present invention. FIG. 1 is a plan view showing a driving device, FIG. 2 is a sectional view taken along line II of FIG.
FIG. 3 is also an enlarged plan view of the support shaft. The same reference numerals as those in FIGS. 4 to 6 denote the same or corresponding members.

In the figure, a lens holder 3 having an objective lens 1 and a counter-weight 2 mounted thereon is attached to a fixed holder 9 by a support rubber 5 having a flat plate shape. The lens holder 3
Is held by a support shaft 17 via a cylindrical movable bearing 3a, and is mounted so as to be rotatable and vertically movable. The yoke 8 is integrated with the yokes 7a and 7b via the permanent magnets 6a and 6b. A coil holder 14 is fixed to the lower side of the lens holder 3, and the coil holder 14 has a focus control coil 10
And an electromagnetic coil such as the track control coil 11a is wound. The support rubber 5 is fixed to the fixed holder 9 by fixing screws 12a and 12b, and the upper part of the support rubber 5 is covered with a cover.
13 are provided. The support shaft 17 is made of an insulating synthetic resin. Inside the support shaft 17, conductors 19a to 19d are integrated along the longitudinal direction of the support shaft 17, and the conductors 19a to 19d are drawn out. Substrate 16a via lines 18a-18d
Through 16d, and this substrate is connected as a relay to the electromagnetic coil.

The operation of the drive device having the above configuration will be described with reference to the drawings. First, magnetic flux is generated between the inner yoke 8 and the outer yokes 7a and 7b by the permanent magnets 6a and 6b.
For this magnetic flux, the focus control coil 10, the track control coils 11a to 11d, the conductors 19a to 19d, and the lead wires 18a to 18
By supplying an electric current through d, the lens holder 3 is rotated and vertically moved as shown by an arrow B in FIG. 1 and an arrow A in FIG. 2 by an electromagnetic force, and the track of the light beam passing through the objective lens 1 is tracked. Control and focus control can be performed.

〔The invention's effect〕

As described above in detail, the drive device according to the present invention has the following effects.

First, since the lead wire is not used to supply a current to the electromagnetic coil of the driving device, but the conductor integrated with the support shaft is used, the operation of the movable portion is not disturbed by the lead wire.

Further, since the lead wire or the like does not block the light beam, it is possible to improve the normal operation of the reproducing apparatus, and the lead wire is not rubbed against the movable part to be disconnected. You can expect stable performance.
Further, since the pull-out position is close to the center of rotation, the amount of movement of the pull-out line when the lens holder is rotated by the same angle can be saved.

[Brief description of drawings]

1 to 3 are for explaining one embodiment of a driving device according to the present invention. FIG. 1 is a plan view of the device, and FIG. 2 is a sectional view taken along line II of FIG. 3 is an enlarged plan view of the support shaft. Further, FIG. 4 is an exploded perspective view showing an example of a conventional drive device, FIG. 5 is a sectional view of the same device, and FIG. 6 is a plan view of the same lens holder. In addition, the same reference numerals in the drawings denote the same or corresponding members. 1 ... Objective lens, 3 ... Lens holder, 3a ... Movable bearing, 9 ... Fixed holder, 10 ... Focus control coil, 11a
To 11d …… Track control coil, 17 …… Spindle, 19…
…conductor.

Claims (2)

[Claims] 1. A support shaft, a cylindrical movable bearing fitted to the support shaft so as to be slidable in the longitudinal direction and rotatable in the circumferential direction, and fixed to the movable bearing. A holder for holding a lens having an optical axis parallel to the longitudinal direction and a driving means for driving the holder in the longitudinal direction and the circumferential direction of the support shaft are provided, and the lens is transmitted by driving the holder. In the driving device for correcting the focus shift and the track shift of the light spot condensed on the optical disk, the current is applied to the driving means via the conductor integrated with the spindle. A drive device characterized by. 2. The drive device according to claim 1, wherein the support shaft is formed of an insulating resin integrated with the conductor.