JPH05189782A - Tracking mirror device - Google Patents

Abstract

PURPOSE:To provide a miniaturizable tracking mirror device capable of suppressing harmful vibration caused to the mirror so as to accurately control the position of the mirror. CONSTITUTION:A support spring 5 is a thin sheet held between a mirror 2 and a mirror holder and fixed at the central part of a movable part 1 by allowing screws 8 to pierce through holes in a pressing plate 21 and the support spring 5 while holding the ends of the spring 5 between support spring fixing parts 7 and the pressing plate 21, screwing the screws 8 into screw holes in the fixing parts 7 and pressing the pressing plate 21 against the heads of the screws 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tracking mirror device for precise position control of a light spot in an optical disk drive device or the like.

[0002]

2. Description of the Related Art FIG. 4 is a perspective view showing an example of a conventional tracking mirror device.

The movable part 1 includes a mirror 2 and a mirror holder 3.
And a drive coil 4. The support spring 5 is
It is one smooth thin plate made of stainless steel or the like having through holes at both ends, sandwiched between the mirror 2 and the mirror holder 3, and fixed to the central portion of the movable portion 1 in the Y direction. The support spring 5 is pressed and fixed to the support spring fixing portion 7 provided on the base member 6 by the heads of the screws 8 penetrating through holes at both ends. A drive coil 4 having a rectangular hole 4a is fixed to both ends in the Y direction of a mirror holder 3 that supports the plate-shaped mirror 2. One end of a yoke 9 fixed to the base member 6 is inserted into the holes 4a of the drive coils 4 at both ends, and one side of the drive coil 4 is arranged in a magnetic gap formed by the magnet 10 and the yoke 9. ing.

The center line C of the support spring 5, which is arranged at the center of the movable portion 1 in the Y direction, becomes the center of rotation of the movable portion 1 when the support spring 5 is twisted. The drive coils 4 on both ends of the movable part 1 are arranged symmetrically with respect to the ZX plane including the center line C, and the yoke 9 and the magnet 10 are arranged.
Similarly, the same thing is arranged symmetrically.

If the direction of the current generated in the drive coil 4 is determined so that the direction of the force in the normal direction (Z direction) of the mirror 2 is opposite, the same amount of current is passed through the drive coils 4 at both ends. As a result, a force having opposite directions and the same magnitude, that is, a couple is generated at both ends of the movable portion 1, and the movable portion 1 is moved to the center line C.
Is driven as the center of rotation.

FIG. 5 is a perspective view showing another example of the support spring fixing portion in which the support spring is fixed by the pressing plate and the pin.

The support spring 5 rotatably supports the movable portion 1 similarly to the tracking mirror device shown in FIG. 4, and has through holes at both ends. The supporting spring 5 is sandwiched between a holding plate 11 having a width wider than the end of the supporting spring 5 and a supporting spring fixing portion, each member is bonded by an appropriate method, and further, a fixing pin 12 is fixed to the holding plate 11 for reinforcement. It is fixed by penetrating through the through hole of the support spring 5 and being driven into the support spring fixing portion.

[0008]

In the above tracking mirror device, as shown in FIG. 4, when the support spring 5 is fixed to the support spring fixing portion 7 by the screw 8, the support spring 5 is fixed to the head of the screw 8. Due to the pressing force and the frictional force of, it is fixed in a state in which a force such as bending or twisting is applied, and deformation or distortion occurs. For this reason, the position control of the mirror 2 cannot be performed with high accuracy, and harmful high-order resonance occurs in the movable portion 1 during tracking driving. Further, the support spring fixing portion 7
Must have high rigidity so as not to be deformed or distorted by the local pressing force of the screw 8 received via the support spring 5, and in order to increase the rigidity, it is necessary to make the thickness and width sufficiently large. Becomes Therefore, it is necessary to increase the size of the support spring fixing portion 7, which causes a problem of increasing the size of the device.

Further, as shown in FIG. 5, when the support spring 5 is clamped between the holding plate 11 and the support spring fixing portion 7 and each member is adhered and further fixed by the pin 12, the pressing force of the pin 12 is applied. Since it is dispersed by the holding plate 11, the deformation and distortion of the support spring 5 and the support spring fixing portion 7 can be suppressed, but the fixing by adhesion and pinning cannot fix the support spring 5 with high rigidity, and the tracking Due to the vibration during driving, the pin 12 and the pressing plate 11 resonate with the support spring fixing portion 7, and harmful vibration is also generated in the mirror 2.

An object of the present invention is to solve the above problems and to enable highly accurate position control of the mirror, so that harmful vibrations occurring in the mirror can be suppressed and the tracking can be reduced in size. It is to provide a mirror device.

[0011]

In order to solve the above-mentioned problems, the present invention provides a movable portion that holds a mirror and is rotatably supported by a plate-shaped support spring, and at least two of the support springs. At least two of the support springs are provided in a tracking mirror device having a fixing portion for fixing an end portion.
It is characterized in that one end portion is fixed in a state of being sandwiched by the fixing portion and the holding plate, and the holding plate is integrally formed.

Alternatively, in a state where at least two end portions of the support spring are held by the fixing portion and the pressing plate,
The pressing plate is integrally formed by fastening and fixing with a screw.

Alternatively, in a state where at least two end portions of the support spring are held by the fixing portion and the pressing plate,
It is characterized in that the support spring, the fixing portion, and the pressing plate are fixed by adhering, and the pressing plate is integrally formed.

[0014]

According to the above means, the support spring is fixed in a state of being sandwiched by the fixing portion and the holding plate, and the holding plate is integrally formed, so that the fixing portion is connected by the holding plate and the rigidity is increased. Therefore, the support spring can be fixed with high rigidity.

Further, since the support spring is clamped and fixed by a screw while being held between the fixing portion and the holding plate, and the holding plate is integrally formed, the pressing force of the screw is applied to the fixing portion and the supporting spring by the holding plate. Evenly distributed and applied, the frictional force of the screw head generated at the time of fastening is not applied to the support spring.

Further, the support spring, the fixing portion and the pressing plate are adhered and fixed in a state where the supporting spring is held between the fixing portion and the pressing plate, and the pressing plate is integrally formed. The width of the support spring can be increased, and the support spring can be fixed with high rigidity.

[0017]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing an embodiment of the present invention with a part thereof being a sectional view, and FIG. 2 is a sectional view of an essential part of this embodiment.

In FIGS. 1 and 2, members corresponding to the members described with reference to FIG. 4 are designated by the same reference numerals and the description thereof will be omitted.

The support spring 5 has its both ends clamped by the support spring fixing portion 7 and the holding plate 21, and the screw 8 holds the holding plate.
It is fixed by penetrating through the through hole of the support spring 5 and the screw hole provided in the support spring fixing portion 7, and pressing the pressing plate 21 against the head of the screw 8.

The pressing plate 21 is integrally formed so as to press the ends on both sides of the support spring 5, and the window portion 11 is located at a position facing the mirror 2 so as not to prevent the light flux from entering the mirror 2.
a is provided. Further, a gap is provided between the movable portion 1 and the pressing plate 21 so as to keep a certain distance or more so as not to interfere with the movement of the driven movable portion 1.

At two points on the rotary shaft of the movable part 1, the support spring 5 is provided.
Is clamped by the support spring fixing portion 7 and the pressing plate 21, and is fastened and fixed by the screw 8.
The support spring fixing portions 7 arranged on both sides of the base member 6 are connected by an integrally formed pressing plate 21 and have a rectangular cross section, and the base member 6 and the support spring fixing portion structurally are fixing portions of the device. 7. The rigidity of the pressing plate 21 can be increased, and the pressing force applied by the head of the screw 8 to the supporting spring fixing portion 7 and the supporting spring 5 is dispersed by the pressing plate 21. Since the rigidity of the fixed portion can be increased, it is possible to suppress vibration that is harmful to the position control of the mirror 2 during the tracking drive of the device. Further, by distributing the pressing force applied to the support spring fixing portion 7 by the pressing plate 21 and increasing the structural rigidity, the support spring fixing portion 7 and the base member 6 can be thinned, and Miniaturization is possible. Further, since the pressing force applied to the support spring 5 is dispersed and no local force is applied, the support spring 5 is not distorted or bent at the time of assembling the device, the assembling accuracy is improved, and the mirror 2 of the mirror 2 is driven at the time of tracking drive. Vibrations harmful to position control can be suppressed.

FIG. 3 is a cross-sectional view showing another example of a holding plate and a support spring fixing portion which holds a support spring.

The support spring 5 includes a support spring fixing portion 7 and a holding plate.
Each member is adhered and fixed by an adhesive or the like in a state of being sandwiched between and. Furthermore, for reinforcement, a pin 12 is driven into a hole provided in the support spring fixing portion 7 through a through hole provided in the pressing plate 21 and the support spring 5.

The presser plate 21 structurally makes the fixed portion highly rigid, further expands the adhesive area, and the support spring 5 can be highly rigidly fixed, so that the mirror 2 is harmful when the device is driven for tracking. Since it is possible to suppress various vibrations and structurally increase the rigidity, the support spring fixing portion 7 and the base member 6 can be made thin, and the device can be downsized.

[0026]

As described above, according to the present invention,
By fixing the support spring in a state of being sandwiched by the fixing portion and the holding plate, and integrally forming the holding plate, the fixing portion has a structurally high rigidity, and the supporting spring can be fixed with a high rigidity. It is possible to provide a tracking mirror device capable of reducing the thickness and downsizing, and suppressing vibration harmful to the position control of the mirror during tracking driving.

Further, since the supporting spring is clamped and fixed by the screw while being held between the fixing portion and the holding plate, no local force is applied to the fixing portion and the supporting spring, so that the fixing portion becomes thin. Since it is possible to reduce the size and prevent the deformation of the support spring, the assembly accuracy is improved.
A tracking mirror device capable of suppressing harmful vibration can be provided.

Further, since the support spring can be fixed with high rigidity by adhering and fixing the support spring to the fixing portion and the holding plate while the support spring is held between the fixing portion and the holding plate, harmful vibration can be suppressed. It is possible to provide a mirror tracking device capable of doing so.

[Brief description of drawings]

FIG. 1 is a perspective view, partly in section, showing an embodiment of the present invention.

FIG. 2 is a sectional view of a main part of this embodiment.

FIG. 3 is a cross-sectional view showing another example of a holding plate and a support spring fixing portion that holds a support spring.

FIG. 4 is a perspective view showing an example of a conventional tracking device.

FIG. 5 is a perspective view showing another example of the support spring fixing portion in which the support spring is fixed by the pressing plate and the pin.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Movable part, 2 ... Mirror, 5 ... Support spring, 6 ... Base member, 7 ... Support spring fixed part, 8 ... Screw, 11,
21 ... Presser plate, 12 ... Pin.

Claims (3)

[Claims] 1. A tracking mirror device comprising: a movable portion that holds a mirror and is rotatably supported by a plate-shaped support spring; and a fixed portion that fixes at least two end portions of the support spring. At least two of said support springs
A tracking mirror device, characterized in that one end is fixed in a state of being sandwiched by the fixing portion and a holding plate, and the holding plate is integrally formed. 2. The holding plate is integrally formed by fastening and fixing at least two end portions of the support spring with a screw in a state of being sandwiched between the fixing portion and the holding plate. Tracking mirror device. 3. The support spring is fixed by adhering the support spring, the fixing portion and the pressing plate in a state where at least two end portions of the supporting spring are held by the fixing portion and the pressing plate, and the pressing plate is fixed. The tracking mirror device according to claim 1, wherein the plate is integrally formed.