CN1297968C

CN1297968C - Read-write head having heat sink

Info

Publication number: CN1297968C
Application number: CNB031458645A
Authority: CN
Inventors: 陈俊明
Original assignee: Asustek Computer Inc
Current assignee: Pegatron Corp
Priority date: 2003-07-11
Filing date: 2003-07-11
Publication date: 2007-01-31
Anticipated expiration: 2023-07-11
Also published as: CN1571037A

Abstract

The present invention relates to a read-write head with a heat dissipation device, which comprises a heat dissipation plate arranged on the upper surface of the read-write head on the inner side of an optical disc drive, wherein a surface structure which is raised upward is formed on the upper surface of the heat dissipation plate and is used for increasing the wind striking area of the heat dissipation plate, and the heat radiation efficiency is raised.

Description

Read/write head with heat abstractor

(1) technical field

The present invention is relevant with the read/write head (pick-up head) in a kind of CD drive, particularly about a kind of read/write head with heat sink, significantly to promote the read/write head radiating efficiency.

(2) background technology

Along with the fast development of PC, the computer peripheral product is also grown up fast and is maked rapid progress.As computer peripheral products such as hard disk drive, CD drive, scanner, printers has been the instrument of modern offices indispensability, and along with the reduction of product price, the computer peripheral product also has been popularized for family from office.Wherein, CD drive is a storing media very convenient at present and widespread usage, except because discs has the great storage volume, and more because stored data can comprise music and picture format, and can long preservation.Particularly, along with digital video disk of new generation (Digital Versatile Disc; DVD) development, owing to have up to the capacity of 17GB and more high-quality output characteristics, and make that the application of CD drive is more extensive.

Please refer to Fig. 1, this figure has shown the dependency structure of bearing assembly (traverse module) 5 in the CD drive.As shown in FIG., the disc bearing mechanism (disk loader) 12 that has comprised a Spindle Motor (spindlemotor) 10 and be installed on Spindle Motor 10 upper limbs in CD drive bearing assembly 5 is in order to the rotation discs that the consumer inserted.In addition, one optical read/write head (pickup head) 14 is to comprise a glide base (carriage) 15, and this glide base 15 is subjected to the driving of drive motor (sled motor) 18, can slide along guide rail 17 front and back, move horizontally with the card of optical read/write head 14 in passing along discs.In optical read/write head 14 and have an a voice coil motor (voice coil motor; Do not show among the figure), carry out the upper and lower displacement of vertical direction in order to adjust optical read/write head 14, laser light energy is focused on the discs accurately.Like this, when discs is positioned in the disc bearing mechanism 12, just can adjust the front and back and the upper-lower position of optical read/write head 14 respectively, to read the data on the discs by drive motor and voice coil motor.

It should be noted that, along with the multiple of CD drive reading of data or burning data constantly promotes, to such an extent as to above-mentioned Spindle Motor 10, drive motor voice coil motor, the rotating speed or the frequency of operating also significantly increase, and make CD drive produce overheated problem easily.In known CD drive design, in order to address this problem, tend to cooling fan is set in CD drive inside, with air-flow, strengthen the radiating effect of CD drive by quick disturbance.

Even now, but for the read/write head 15 of having installed optical read/write head 14, the radiating effect that said fans produced is still very limited.Main cause is, can assemble the element of heating easily such as the IC chip of voice coil motor, CD-ROM drive motor and laser diode, optical element on the present read/write head 15 simultaneously.In case these elements are when the operation of carrying out the high speed programming or reading, the IC chip need be handled a large amount of drive signals, and by voice coil motor, optical read/write head can be moved fast.Under this kind situation, these elements tend to be absorbed in too high operating temperature, and make whole read/write head 15 casings hot easily, and cause the read-write/fetch program to be made a mistake.Particularly, when optical read/write head 14 when carrying out the action of programming owing to can use laser beam, come the recording layer on the discs is carried out data burning with higher-wattage, the therefore heat dissipation problem of whole read/write head 15, it is more serious to become.

Therefore, how effectively to improve the heat dissipation problem of read/write head,, become high multiple CD drive/CD writers exploitation and the important topic that designs to reduce IC chip or other elements owing to the overheated chance that breaks down.

(3) summary of the invention

The invention provides a kind of read/write head, can before and after the slide rail of CD drive inboard, slide with heat abstractor.This read/write head comprises following assembly at least: an optical read/write head, can carry out the action of data read or burning with laser beam to discs; One voice coil motor is in order to adjust the upper and lower displacement that this optical read/write head carries out vertical direction; One control chip is in order to drive the operation of this voice coil motor and this optical read/write head; In addition, a heat sink is attached on this control chip, and this heat sink has the surface structure that raises up, and hits the wind area in order to what increase this heat sink, promotes radiating efficiency.

In addition, this heat sink also has several holes, to the double-screw bolt in should the read/write head pedestal, this heat sink can be fixed on the double-screw bolt of this read/write head pedestal so that pass the screw of these holes respectively.

The surface structure of above-mentioned heat radiator can be a plurality of fins that upwards start.These fins can have square type outward appearance or have circular-arc outward appearance, and are by heat sink being carried out the cutting of " ㄇ " font or " U " font, the part after will cut more upwards bend form.In addition, the surface structure of heat radiator also can be the wavy surface structure of dense arrangement.

(4) description of drawings

By detailed description below in conjunction with accompanying drawing, can understand foregoing and plurality of advantages of the present invention easily, wherein:

The associated component structure of bearing assembly in Fig. 1 display light disk drive;

Fig. 2 shows the modular construction of read/write head that first embodiment of the invention provides, and wherein heat sink has the fin that upwards starts;

Fig. 3 shows the modular construction of read/write head that second embodiment of the invention provides, and wherein heat sink has folding roof type structure; And

Fig. 4 shows the side view of read/write head that first embodiment of the invention provides.

(5) embodiment

The invention provides a kind of heat sink (heat sink) that is installed in CD drive read/write head upside, by making the surface structure raise up or start at the heat sink upper surface, hit the wind area with what increase heat sink, and then promote its radiating efficiency.Relevant of the present invention be described in detail as follows described.

Please refer to Fig. 2, this figure has shown by read/write head 20 provided by the present invention.This read/write head 20 is to be assembled in the CD drive, and by the sliding sleeve 201 of read/write head 20 sides, is set on the slide rail 30 in the CD drive, and this read/write head 20 can be moved forward and backward along slide rail.This read/write head 20 has comprised a pedestal (carriage) 200, an optical element (not shown), laser diode (not shown), a voice coil motor 202, a control chip 203, stiffening plate 204 and flexible circuit board (FPC) 205.Wherein, pedestal 200 is in order to carrying or holds optical element, laser diode, voice coil motor 202 and control chip 203.Laser diode is to be installed in the pedestal 200, can carry out data read or burning program to discs with laser beam.Be installed on pedestal 200 belows as for 202 of voice coil motors, the optical element that is used for adjusting optical read/write head carries out moving of horizontal or vertical direction, to adjust the angle of optical read/write head outgoing beam.

For control chip 203 assemblings are soldered on the flexible circuit board 205, between pedestal 200 surfaces and flexible circuit board (FPC) 205 of read/write head 20, can set up a stiffening plate 204 earlier.This piece stiffening plate 204 is made of plastic material, so that when using surface mount technology (SMT) to be assembled in control chip 203 on the flexible circuit board 205, provide enough bracing forces.This piece flexible circuit board 205 is to be wound on the surface of whole pedestal 200, and by the upper surface of pedestal 200, extends downwards to be distributed in the sidewall and the lower surface of pedestal 200, so that make relevant element can produce electrically connect.At the upper surface of flexible circuit 205, then has control chip 203 with the assembling of SMT processing procedure.

In addition, attached a heat sink 206 at control chip 203 upper surfaces.This piece heat sink 206 has the surface structure that is raised up or started by pedestal 200, and what can be used for increasing heat sink 206 hits the wind area, and then promotes its radiating efficiency, and helps to reduce the temperature of control chip 203.In preferred embodiment, heat sink 206 its surface structures that raise up as shown in Figure 2, are the fin 206a that upwards starts for a plurality of.These fins 206a has square type outward appearance, and its production method is to be formed by punching press, or by heat sink 206 being carried out " ㄇ " font cutting action, the part after will cutting again makes progress bending and forms the fin 206a that starts.So, when the air-flow of CD drive internal disturbance, during by heat sink 206 upper surfaces,, and help the lifting of radiating efficiency because these fin 206a that upwards start can produce the effect of hitting wind.

For the ease of understanding, and please refer to Fig. 4, show above-mentioned read/write head 20, control chip 203 and heat sink 206 among the figure with fin 206a.As aforementioned, stiffening plate (showing among this figure) be installed up to read/write head 20 upper surfaces, and after twining last flexible circuit board (also showing among this figure), control chip 203 can be assembled to read/write head 20 tops.Then, again heat sink 206 is attached at control chip 203 upper surfaces, as shown in FIG., on heat radiator 206, is formed with the fin 206a that upwards starts.What particularly point out is that the fin 206a that herein upwards starts also can be made into the circular-arc outward appearance with " U " font except the square type outward appearance with " ㄇ " font.

Except the above-mentioned mode that is made into fin 206a, in another embodiment of the present invention, please refer to Fig. 3, also can on heat sink 206 surfaces, make wavy surface structure 206b.By these wavy structure 206b, can further increase the area of dissipation of entire heat dissipation plate 206 and hit the wind area, and help to reduce the temperature of control chip 203.In addition, what particularly point out is, on above-mentioned heat sink 206 and be provided with several holes 206c, corresponds respectively to the double-screw bolt on the pedestal 200, so that by screw this heat sink is fixed on this pedestal 200, and makes heat sink be attached at control chip 203 upper surfaces.

What particularly point out is that although in Fig. 2, heat sink 206 its fin 206a that upwards start all start towards same direction.But in actual applications, these fins start direction, can adjust along with the trend of rough air around the read/write head 20.In other words, can make each fin, start towards different orientation respectively, hit the wind effect and strengthen it.

Because the heat sink that is disclosed among the present invention, has the bigger wind area that hits, to such an extent as to so heat of the whole read/write head of the more effective eliminating control chip of energy, reducing the working temperature of above-mentioned optical read/write head, voice coil motor and control chip, and make CD drive can keep the state of normal running.

Though the present invention illustrates as above with preferred embodiments, yet it is not in order to limit spirit of the present invention and scope of patent protection.Therefore, the modification of being done in not breaking away from spirit of the present invention and scope all should be included in the following claim institute restricted portion.

Claims

1. read/write head with heat abstractor comprises at least:

One pedestal; And

One heat sink is positioned on this pedestal, and this heat sink has a plurality of fins that upwards start.

2. the read/write head with heat abstractor as claimed in claim 1 is characterized in that described fin forms wavy.

3. the read/write head with heat abstractor as claimed in claim 1 is characterized in that described heat sink is with impact briquetting.

4. the read/write head with heat abstractor as claimed in claim 1 is characterized in that, described read/write head with heat abstractor also comprises control chip, places described pedestal.

5. the read/write head with heat abstractor as claimed in claim 4 is characterized in that, described heat sink is to be attached at this control chip upper surface.

6. read/write head with heat abstractor comprises:

One control chip; And

A heat sink is attached on this control chip, and this heat sink has the fin that upwards starts.

7. the read/write head with heat abstractor as claimed in claim 6 is characterized in that, described read/write head with heat abstractor also has a pedestal, and wherein said heat sink has hole, and this hole is to the double-screw bolt in should pedestal.

8. the read/write head with heat abstractor as claimed in claim 6 is characterized in that described heat sink is with impact briquetting.

9. the read/write head with heat abstractor as claimed in claim 6 is characterized in that, described fin has square type outward appearance, and is by this heat sink being carried out " ㄇ " font cutting, and the part after will cut more upwards bends and forms.

10. the read/write head with heat abstractor as claimed in claim 6 is characterized in that, described read/write head with heat abstractor can slide before and after the slide rail of this CD drive inside, to adjust the front and back position of this read/write head.

11. the read/write head with heat abstractor as claimed in claim 6 is characterized in that, described read/write head with heat abstractor also comprises a stiffening plate, and this stiffening plate places between described control chip and the described pedestal to provide support strength.