JP2821581B2 - Rotating mirror device for tracking - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tracking rotating mirror device used for causing an optical beam spot to follow a track on an optical disk, for example, in an optical head of an optical disk device. .

[Prior Art] FIG. 5 is a perspective view of a conventional rotating mirror device for tracking. A reflecting mirror 1 is supported by a thin leaf spring 3 via a mirror holding member 2 and a driving coil 4 fixed to the back surface thereof. It is rotationally driven by a magnetic force acting between the magnetic disk and the yoke 5. Here, the wiring member 6 to the drive coil 4 is introduced from a hole 5 a provided in the yoke 5. When a current flows through the drive coil 4 via the wiring member 6, the reflection mirror 1 slightly rotates in the vertical direction. The angle is thin leaf spring 3
And the magnetic force acting on the drive coil 4 is proportional to the magnitude of the current.

[Problems to be Solved by the Invention] However, in this conventional example, a space only for the wiring member 6 and a hole 5a are required for wiring to the driving coil 4 for rotation of the reflection mirror 1; In addition, there is a problem that a reaction force due to the elasticity or inertia of the wiring member 6 is transmitted to the reflection mirror 1 and adversely affects tracking frequency characteristics and neutrality.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and to provide a more accurate, more accurate, and smaller tracking turning mirror device.

Means for Solving the Problems In order to achieve the above-mentioned object, in a tracking turning mirror device according to the present invention, a tracking turning device for driving a light beam spot in a radial direction of an optical disk of an information recording medium is used. A mirror device, wherein a mirror holding member for holding a reflection mirror is rotatably supported by a thin plate spring, a flat portion of the thin plate spring is overlapped on a reflection surface of the reflection mirror, and the thin plate spring is combined with the flat portion. The twisted portion for the rotation is formed by constricting between the attachment portion to the thin leaf spring support member, and the thin leaf spring also serves as a wiring board to the movable coil for the rotation. Is what you do.

[Operation] In the tracking rotating mirror device having the above-described configuration, since the thin leaf spring also serves as the wiring board, unnecessary external force is not applied to the mirror holding member that holds the reflection mirror, and the rotation of the reflection mirror is stabilized. At the same time
Space for wiring is reduced, and downsizing can be achieved.

Embodiment The present invention will be described in detail based on an embodiment shown in FIGS.

FIG. 1 is a perspective view of the first embodiment, FIG. 2 is a sectional view thereof, FIG. 3 (a) is a perspective view of a driven portion, FIG. 3 (b) is a side view, and FIG. FIG. 3D is a plan view as a cross section, and FIG. The reflection mirror 10 is held by attaching the back surface of the reflection surface to a mirror holding member 11, and the mirror holding member 11 is suspended and held by a thin plate spring 12. A drive coil 13 is wound around the side surface of the mirror holding member 11, and the yokes are arranged on both sides of the drive coil 13 so as to sandwich the coil 13.
14. A relay yoke 15 is provided, and a permanent magnet 16 is interposed between the yokes 14 and 15. As shown in FIG. 3 (d), the thin plate spring 12 is
a, comprises two mounting portions 12b for supporting the thin leaf spring 12 and two torsion portions 12c for rotating the reflection mirror 10, and the torsion portion 12c is formed between the mounting portion 12a and the mounting portion 12b. The width of the torsion portion 12c and the thin plate spring 1
By changing the plate thickness of No. 2, it is possible to change the torsional rigidity and change the primary torsional resonance frequency. The rotation of the reflection mirror 10 is performed by a magnetic circuit including the yoke 14, the relay yoke 15, and the magnet 16, and the drive by the drive coil 13, and the two torsion portions 12c of the thin plate spring 12 become the center of rotation. The thin leaf spring 12 is a flexible printed wiring board based on a polymer material such as polyimide or polyester.
Through 2c, wiring patterns 17 are formed one by one on the left and right up to the attachment portion 12b to the thin plate spring support member, and the terminal 13a of the drive coil 13 is connected to the wiring pattern 17.

The rotation drive of the reflection mirror 10 is performed by two fixed mounting portions.
This is performed by passing a current between the wiring patterns 17 on 12b, and when a current is passed through the drive coil 13 via the terminal 13a, a force is generated in a direction perpendicular to the reflection surface of the reflection mirror 10, but this force is generated. Since the driving coil 13 is constrained by the thin plate spring 12 via the mirror holding member 11, the force is converted into a moment force about the torsion portion 12c of the thin plate spring 12, and the reflection mirror 10 is turned around the torsion portion 12c. Rotate.

4A and 4B show a second embodiment, in which FIG. 4A is a perspective view of a driven portion, FIG. 4B is a side view, FIG. 4C is a plan view with a partial cross section, and FIG. It is. In this embodiment, a thin plate spring
12 are divided into two, and are thin leaf springs 12 'and 12 "made of a metal spring material having high conductivity such as phosphor bronze and beryllium copper. The thin leaf springs 12' and 12" are arranged symmetrically,
Each mounting portion 12a is attached to the mirror holding member 11, the terminal 13a of the drive coil 13 is connected to the mounting portion 12a, and the thin plate spring 21 itself is used as a wiring material. Therefore, the mounting part 12
By supplying a current from b, a current can be supplied to the drive coil 13 via the terminal 13a.

In any of the embodiments, since the mirror holding member 11 receives elastic force only from the thin plate spring 12, control is easy,
Also, there is almost no need to consider the space for the wiring material.

[Effects of the Invention] As described above, in the tracking turning mirror device according to the present invention, the thin plate spring supporting the mirror also serves as a wiring material for the movable coil, thereby improving the rotation stability and increasing the speed. Is possible, and at the same time, the space for wiring is reduced and the size is reduced.

[Brief description of the drawings]

1 to 4 show an embodiment of a tracking rotating mirror device according to the present invention. FIG. 1 is a perspective view of the first embodiment, FIG. 2 is a sectional view thereof, and FIG. FIG. 4A is a perspective view of a driven portion, FIG. 4B is a side view, FIG. 4C is a plan view with a partial cross section, FIG. 5D is a rear view, and FIG. FIG. 5B is a perspective view of the driven portion, FIG. 5B is a side view, FIG. 5C is a rear view, and FIG. 5 is a perspective view of a conventional example. 10 is a mirror, 11 is a mirror holding member, 12, 12 ', 12 "
Is a thin plate spring, 13 is a drive coil, and 17 is a wiring pattern.

Claims (1)

(57) [Claims] 1. A tracking turning mirror device for driving a light beam spot in a radial direction of an optical disk of an information recording medium, wherein a mirror holding member for holding a reflection mirror is rotatably supported by a thin plate spring, A flat portion of the thin plate spring is superimposed on the reflection surface of the reflection mirror, and the thin plate spring is constricted between the flat portion and the mounting portion to the thin plate spring support member to form a torsion portion for the rotation. The tracking mirror device for tracking, wherein the thin plate spring also serves as a wiring board to a movable coil for rotation.