JP2600685B2 - Pickup actuator - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an actuator used for a pickup device of a device for reproducing information from a disk-shaped record carrier (hereinafter referred to as a disk).

2. Description of the Related Art In recent years, playback devices using optical technology, such as a CD player and a video disk player, have begun to be widely used.

The above-described conventional pickup actuator will be described with reference to the drawings.

FIG. 2 shows an embodiment of a conventional pickup actuator. In FIG. 2, reference numeral 12 denotes a main shaft, one end of which is fixed. Reference numeral 2 denotes a driven bobbin as a driven tube, on which an objective lens is mounted, and which can slide (focusing operation) and rotate (tracking operation) with respect to the main shaft 12. The driven bobbin 2 is provided with two types of electromagnetic coils (a focusing coil 7 and a tracking coil 6). The driven bobbin 2 is provided with a sliding force and a rotating force by the repulsive and attractive force generated between the electromagnetic coil, the magnet, and the yoke.

An objective lens 5 is attached to the driven bobbin 2, and although not shown, the laser beam is focused on the disk surface.

Problems to be Solved by the Invention However, in the above-described configuration, the clearance between the main shaft 12 and the driven bobbin 2 requires a clearance (play). A large disturbance noise occurs in the control signal due to the collision occurring between the two, and the tracking operation becomes unstable. When the clearance increases, the vibration resistance extremely deteriorates.

The present invention has been made in view of the above problems, and provides a pickup actuator capable of reducing impact vibration accompanying a collision generated between a main shaft and a sliding bobbin, realizing a stable control operation and improving earthquake resistance. The purpose is to provide.

Means for Solving the Problems In order to solve the above problems, the pickup actuator of the present invention is provided with support means for elastically supporting the main shaft.

Function The present invention, by the above-described configuration, reduces shock vibration caused by a collision between the main shaft and the driven bobbin when disturbance is applied in the tracking direction, and reduces disturbance noise generated in the control signal. As a result, seismic resistance can be significantly improved.

Embodiment Hereinafter, a pickup actuator according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows an embodiment of the present invention. In the drawing, 1 is a main shaft, and 2 is a driven bobbin as a driven tube inserted into the main shaft 1. Reference numeral 3 denotes an arm that supports the main shaft 1, and is fixed via an elastic member 4 (a viscoelastic member such as rubber). The other components are in accordance with the conventional example, and the description thereof is omitted here.

According to the above configuration, the impact vibration caused by the collision between the main shaft 1 and the driven bobbin 2 generated when a disturbance is applied in the tracking operation direction is absorbed and collided by the elastic member 4, and the disturbance signal generated in the control signal is suppressed. The tracking operation can be improved in stability and vibration resistance. The elastic member 4 also functions as a cushioning material in directions other than the tracking operation direction, so that the vibration resistance in all directions is improved.

As described above, according to the present embodiment, the spindle 1 and the spindle 1
By providing the driven bobbin 2 inserted in the main body, the arm 3 supporting the main shaft 1, and the elastic member 4 supporting the arm 3, it is possible to suppress the impact vibration of the actuator due to a disturbance applied to the reproducing apparatus.

Effect of the Invention As described above, the present invention provides a stable playback device by providing a main shaft, a driven tube slidably and rotatably disposed with respect to the main shaft, and a support means for elastically supporting the main shaft. Control operation and improvement of earthquake resistance can be realized.

[Brief description of the drawings]

FIG. 1 is a plan view and a front sectional view showing a pickup actuator according to an embodiment of the present invention, and FIG. 2 is a plan view and a front sectional view showing a pickup actuator according to a conventional example. 1 ... spindle, 2 ... driven bobbin, 3 ... arm, 4 ...
Elastic member.

Claims (1)

(57) [Claims] An objective lens, a main shaft for slidingly and rotatably guiding a driven tube on which the objective lens is mounted, an arm supporting both ends of the main shaft, and supporting the arm via an elastic member. An actuator for pickup, comprising: an arm fixing member.