JP2005092905A - Pickup unit and optical disk device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pickup unit capable of efficiently discharging heat generated by the power consumption of a mounted module. <P>SOLUTION: The pickup unit 2 for writing information in a disk (optical disk) 1 and reading information from the disk 1 is provided with a carriage 3 and an actuator base 4, wherein as a heat discharging means, a plurality of fins (linear fins) 5 are formed on the upper surface of the carriage 3 in the tangential direction of the disk 1. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a pickup unit and an optical disc apparatus.

A pickup unit for high-speed recording / reproduction basically tends to increase power consumption. Naturally, it is necessary to save labor in consideration of environmental issues when designing an actual product. However, apart from this effort, it is necessary to cope with an increase in power from the actual required specifications. The reason for this is as follows.
First, in order to converge a sufficient energy density on the medium in the case of high-speed recording / reproduction, a light source having a higher power than that of the conventional device is required on the pickup, and it is similarly mounted on the pickup for SN reasons. The power of the control driver IC is also increased.
Second, since the medium rotates at a high speed during high-speed recording / reproduction, the surface blur and eccentric acceleration increase compared to those at a low speed. In terms of the dynamic principle of the rigid body, the acceleration increases in proportion to the square of the frequency, so that the power consumption of the actuator that follows this increases.

For this reason, an increase in power consumption of the module on the pickup is inevitable unless recording / reproduction quality and media following capability are sacrificed. However, since the pickup itself is also a movable body, its mass, volume, and dimensions are limited, and as a result, it is difficult to dramatically improve heat dissipation and heat resistance.
However, since it is indispensable to reduce costs for providing high-performance products at low cost, it is also necessary to cover, for example, expensive optical parts with molded resin material parts. This produces an effect of reducing the mass of the movable part of the actuator, and an effect of reducing the power consumption by increasing the sensitivity of the actuator can also be expected. However, since the resin lens has lower heat resistance than glass, the countermeasure against heat becomes strict when it is mounted on the actuator moving part on the pickup.
In addition, even if the heat generated by the motor coil of the actuator moving part is unavoidable for the lens mounted on the moving part, it is difficult to cope with further speedup in the future unless heat countermeasures are taken into consideration for the entire pickup. is there.
An object of the present invention is to provide a pickup unit and an optical disc apparatus that can efficiently dissipate heat generated by power consumption of a mounted module.

In order to achieve the above object, according to the first aspect of the present invention, in the pickup unit including the carriage and the actuator base, the carriage is characterized by the pickup unit having the heat radiating means as the main feature.
The invention according to claim 2 is characterized in that the heat radiating means is a plurality of fins provided on the upper surface of the carriage.
The invention according to claim 3 is characterized in that the plurality of fins are formed in the tangential direction of the disk, and the pickup unit according to claim 2 is a main feature.
The invention according to claim 4 is characterized in that the plurality of fins are formed in the circumferential direction of the disk.
The invention according to claim 5 is characterized in that the heat radiating means is a plurality of fins provided on the upper surface of the actuator base.
The invention according to claim 6 is mainly characterized by the pickup unit according to claim 5 in which the plurality of fins are formed in the tangential direction of the disk.
The invention according to claim 7 is characterized in that the plurality of fins are formed in the circumferential direction of the disk.
The invention according to claim 8 is characterized in that the optical disk device on which the pickup unit according to claim 1 or 5 is mounted is the main feature.

  According to the present invention, since the plurality of fins for heat dissipation are provided on the carriage or the actuator base, the pickup unit can efficiently dissipate heat.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIGS. 1A and 1B are top views of the pickup unit of the optical disc apparatus according to the first embodiment of the present invention. A pickup unit 2 that optically writes information on a disk (optical disk) 1 and reads information from the disk 1 includes a carriage 3 and an actuator base 4.
In the present embodiment, a plurality of fins (linear fins) 5 formed in the tangential direction of the disk 1 are provided on the upper surface of the carriage 3 as a heat radiating means. The fins 5 may be formed on the actuator base 4.
In the present invention, since the plurality of fins for heat dissipation are provided on the carriage or the actuator base, the pickup unit can efficiently dissipate heat.
The fin 5 may have a planar shape extending linearly or a shape extending in the circumferential direction of the disk. In the case of a linear fin, the tangential direction of the outer periphery of the disk may be set in the extending direction.
FIG. 2 is a top view of the pickup unit of the optical disc apparatus according to the second embodiment of the present invention. In the present embodiment, the pickup unit 2 is provided at two locations on the inner peripheral portion and the outer peripheral portion of the disk 1, and a plurality of fins (arc-shaped fins) formed in the circumferential direction of the disk 1 on the upper surface of each carriage 3. 6 is provided. Of course, the linear fin 5 as shown in FIG.
FIG. 3 is a top view of the pickup unit of the optical disc apparatus according to the third embodiment of the present invention. In the present embodiment, there are pickup units 2 at two locations on the inner periphery and the outer periphery of the disk 1. The actuator base 4 of the inner pickup unit 2 is provided with a plurality of linear fins 5, and the outer pickup unit 2 The actuator base 4 is provided with a plurality of arc-shaped fins 6. Both actuator bases 4 may be linear fins 5, or conversely arcuate fins 6.

1 is a top view of a pickup unit of an optical disc apparatus according to a first embodiment of the present invention. FIG. 6 is a top view of a pickup unit of an optical disc device according to a second embodiment of the present invention. FIG. 10 is a top view of a pickup unit of an optical disc device according to a third embodiment of the present invention.

Explanation of symbols

  1 disc, 2 pickup unit, 3 carriage, 4 actuator base, 5 fin

Claims (8)

  A pickup unit comprising a carriage and an actuator base, wherein the carriage has a heat radiating means.   2. The pickup unit according to claim 1, wherein the heat dissipating means is a plurality of fins provided on the upper surface of the carriage.   3. The pickup unit according to claim 2, wherein the plurality of fins are formed in a tangential direction of the disk.   3. The pickup unit according to claim 2, wherein the plurality of fins are formed in a circumferential direction of the disk.   2. The pickup unit according to claim 1, wherein the heat dissipating means is a plurality of fins provided on the upper surface of the actuator base.   6. The pickup unit according to claim 5, wherein the plurality of fins are formed in a tangential direction of the disk.   6. The pickup unit according to claim 5, wherein the plurality of fins are formed in a circumferential direction of the disk.   6. An optical disk device on which the pickup unit according to claim 1 is mounted.

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