JPH0611114U - Optical pickup device - Google Patents

Abstract

(57) [Abstract] [Purpose] To easily and inexpensively assemble a moving drive system, and to reduce the number of parts efficiently, while efficiently reducing the load on the drive motor. To provide an optical pickup device capable of performing. When an optical pickup 2 for reading information recorded on an optical disc H by a moving drive system 20 is moved in a radial direction of the optical disc H, a drive pulley 22 fixed to an output shaft 21 of a drive motor M and a feed screw. Rotation is transmitted from the drive motor M to the feed screw 9 by the power transmission belt 24 stretched between the driven pulleys 23 fixed between the drive pulleys 23, and the load of the drive motor M is absorbed by the tension of the belt 24. It

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an optical pickup device including an optical pickup for reading information recorded on an optical disc, and a movement drive system for moving the optical pickup in the radial direction of the optical disc.

[0002]

[Prior art]

 2. Description of the Related Art Conventionally, for example, as a vehicle-mounted acoustic device, there is a so-called CD player equipped with an optical pickup device.

As shown in FIGS. 3 and 4, such an optical pickup device A has an optical disc drive system 1, an optical pickup 2 as an optical disc reading device, and the optical pickup 2 as an optical disc H. An optical pickup transport system 3 that moves in the radial direction is provided.

The optical disk drive system 1 includes an optical disk drive motor 4 provided in the main body, and a turntable 5 fixed to the output shaft of the optical disk drive motor 4 to support the optical disk H.

The optical pickup 2 has a housing 6 and an optical system (not shown) including an objective lens 7 and the like provided in the housing 6, and a laser beam is applied to the reading surface of the optical disc H by this optical system. The laser beam reflected by the reading surface of the optical disk H is set so as to be captured.

The optical pickup transport system 3 is inserted into a bearing 2 a provided on one side of the optical pickup 2 to guide the optical pickup 2 in a semi-radial direction so as to guide the transport of the optical pickup 2. A shaft-shaped lead screw 9 which engages with the shaft 8 and a screw receiving portion 2b provided on the other side of the optical pickup 2 and extends in the radial direction of the optical disc H, and the feed screw 9 is moved. A drive motor M for rotationally driving the drive system 10 is provided.

The moving drive system 10 includes a drive gear 12 fixed to the output shaft 11 of the drive motor M, a large gear 13a meshing with the drive gear 12, and a small gear 13b provided coaxially with the large gear 13a. The reduction gear 13, a driven gear 14 which is coaxially fixed to the feed screw 9 and meshes with the small gear 13b, and a leaf spring 15 which is biased in a direction opposite to the thrust direction of the driven gear 14 are provided.

In the movement of the optical pickup 2 of the optical pickup device A configured as described above, the driving gear M, the reduction gear 13, and the driven gear 14 are transmitted in order by the drive of the drive motor M to rotate, The feed screw 9 rotates in response to the rotation of the driven gear 14, and the rotation causes the screw receiving portion 2b engaged with the feed screw 9 to be forcibly displaced, whereby the entire optical pickup 2 is shown in FIG. Move between the solid line position and the chain line position.

At this time, for example, when the movement of the optical pickup 2 in the direction of arrow A in the figure is obstructed by dust or the like attached to the guide shaft 8, the feed screw 9 resists the bias of the leaf spring 15. A slight increase in the load of the drive motor M can be prevented by slightly moving in the direction opposite to the arrow a.

In addition, play is set in the transmission system of the optical pickup transport system 3, that is, in the mesh of the feed screw 9 and the screw receiving portion 2b, the drive gear 12 and the large gear 13a, and the small gear 13b and the driven gear 14. Therefore, the load on the drive motor M at the time of cogging, which operates to position the optical axis of the objective lens 7 at the track position of the optical disc H in the state where the drive motor M is constantly rotating, is reduced.

[0011]

[Problems to be solved by the device]

 By the way, in the optical pickup device A configured as described above, it is necessary to cause cogging a plurality of times in a short time until the optical pickup 2 is moved to a predetermined position, and the optical disc H rotates. Since the cogging is repeated as long as it is in the playing state, there has been a problem that the factor that hinders the cogging directly causes a defect in the product.

Therefore, in particular, the precision of the reduction gear 13 itself and the accuracy of the mounting position and posture of the moving drive system 10 are required to be high, and this precision is required for the lubricating oil application work at the time of mounting. As a result, the parts cost and assembly cost for using precision parts have become high.

In view of the above situation, the present invention makes it possible to easily and inexpensively assemble a moving drive system and reduce the number of parts while reducing the load on the drive motor. It is an object of the present invention to provide an optical pickup device that can be efficiently reduced.

[0014]

[Means for Solving the Problems]

 In order to achieve the object, the present invention provides an optical pickup device including an optical pickup for reading information recorded on an optical disc and a movement drive system for moving the optical pickup in the radial direction of the optical disc. The moving drive system includes a drive motor, a shaft-shaped feed screw extending in the radial direction of the optical disc, and a belt transmission means arranged between the drive motor and the feed screw. It is what

[0015]

[Action]

 An optical pickup for reading the information recorded on the optical disk is moved in the radial direction of the optical disk by the moving drive system.

At this time, as for the rotation of the feed screw for moving the optical pickup, the power from the drive motor is transmitted by the power transmission belt stretched between the drive motor and the feed screw.

[0017]

【Example】

 Next, an embodiment of the optical pickup device of the present invention will be described with reference to FIGS.

FIG. 1 is a plan view of an optical pickup device of the present invention, and FIG. 2 is a schematic front view showing a main part of the optical pickup device of the present invention. 1 and 2, the same components as those of the above-mentioned conventional technique are designated by the same reference numerals and the description thereof will be omitted. For example, a guide rail is provided instead of the guide shaft 8 and The optical pick-up 2 is not limited to the configuration of the prior art, such as sliding.

In the figure, 20 is a moving drive system for transmitting the drive of the drive motor M to the feed screw 9. This moving drive system 20 includes a drive pulley 22 fixed to an output shaft 21 of a drive motor M, a driven pulley 23 fixed to a shaft-shaped feed screw 9 extending in the radial direction of an optical disk H, and a drive pulley 23. A belt 24 for power transmission stretched between a pulley 22 and a driven pulley 23 is provided.

When the drive pulley 22 is rotated by the drive of the drive motor M, the rotation causes the belt 24 to rotate between the drive pulley 22 and the driven pulley 23, and the rotation of the belt 24 causes the belt 24 to rotate. The driven pulley 23 is rotated and the feed screw 9 is rotated.

At this time, not only the load at the time of starting the motor is reduced as in the case of using the conventional gear due to slight slippage between the pulleys 22 and 23 and the belt 24, but also when the optical pickup 2 is moved. Even when the movement of the optical pickup 2 is hindered by dust or the like adhering to the guide shaft 8, similar sliding reduces the load on the motor.

Moreover, when the optical pickup device of the present invention is installed, for example, in an environment where the temperature difference inside the vehicle is large, such as a vehicle interior, by using a rubber belt 24, The decrease in the current value of the drive motor M and the excessive rotation speed are absorbed by the decrease in the tension due to the softening of the belt 24, and the increase of the current value and the decrease of the rotation speed of the drive motor M in the low temperature environment are Since it is absorbed by the increase in tension due to curing, it is possible to rotate the driven pulley 23 in a state close to the usage environment under a normal temperature environment. The moving drive system of the pickup may be configured by combining the gear transmission and the belt transmission.

[0023]

[Effect of device]

 According to the optical pickup device of the present invention, by configuring as described above, the moving drive system can be easily and inexpensively assembled and the number of parts can be reduced. However, the load on the drive motor can be efficiently reduced.

[Brief description of drawings]

FIG. 1 is a plan view of an optical pickup device of the present invention.

FIG. 2 is a schematic front view showing a main part of the optical pickup device of the present invention.

FIG. 3 is a plan view of a conventional optical pickup device.

FIG. 4 is a schematic front view showing a main part of a conventional optical pickup device.

[Explanation of symbols]

 H optical disk M drive motor 2 optical pickup 9 feed screw 20 moving drive system 21 output shaft 22 drive pulley 23 driven pulley 24 belt

Claims (1)

[Scope of utility model registration request] 1. An optical pickup device comprising an optical pickup for reading information recorded on an optical disc, and a movement drive system for moving the optical pickup in a radial direction of the optical disc, wherein the movement drive system is An optical pickup device comprising: a drive motor, a shaft-shaped feed screw extending in a radial direction of the optical disc, and a belt transmission unit arranged between the drive motor and the feed screw.