KR100556749B1 - Heat diffusion system of optical pick-up device of optical disk drive and a method thereof - Google Patents

Abstract

The present invention relates to a heat dissipation system of an optical pickup device of an optical disc drive and a heat dissipation method thereof, comprising: a light emitting device for generating light irradiated onto an optical disc; A temperature sensor for sensing a temperature of the light emitting device; A structure in which the light emitting element is installed; A heat sink formed to efficiently dissipate heat; Heat sink contact means for contacting the heat sink and the structure; The present invention provides a heat dissipation system of an optical pickup device of an optical disk drive, which can realize stable light emitting device performance by effectively dissipating heat generated from a light emitting device of a pickup optical system of the optical disk drive.

Optical pickup, heat sink, forced heat

Description

Heat dissipation system of optical pickup device of optical disk drive and heat dissipation method {HEAT DIFFUSION SYSTEM OF OPTICAL PICK-UP DEVICE OF OPTICAL DISK DRIVE AND A METHOD THEREOF}

1 is a plan view of a conventional slad optical disk drive

FIG. 2 is a schematic diagram showing the configuration of an actuator of the optical pickup device of FIG.

3 is a schematic diagram showing the configuration of an optical system of the optical pickup device of FIG.

Figure 4 is a perspective view showing the configuration of an optical pickup device of another conventional swingarm type optical disk drive

5 to 7 relate to a heat dissipation system of an optical pickup apparatus of an optical disc drive according to an embodiment of the present invention.

FIG. 5 is a diagram showing the configuration of a heat dissipation system of an optical pickup device of a slad optical disk drive; FIG.

6 is an enlarged perspective view illustrating an enlarged portion A of FIG. 5;

7 is a graph showing a temperature curve of a light emitting device according to a heat dissipation state;

** Description of symbols for the main parts of the drawing **

10: pickup transport motor 20: lead screw

30: rack gear 40: optical pickup device

41: objective lens 46: temperature sensor

50: pickup base 51: light emitting element

59: leaf spring 80: deck

81: heat sink

The present invention relates to a heat dissipation system of an optical pickup device of an optical disk drive and a heat dissipation method thereof, and more particularly, to a heat dissipation system of an optical pickup device of an optical disk drive configured to effectively dissipate heat generated from a light emitting device of a pickup optical system of the optical disk drive. And a heat dissipation method thereof.

In general, the optical pickup system reads the data of the optical disk by the reflected light by scanning the light on the surface of the optical disk, and maintains the size of the focus constant even from external shocks for recording and reproducing more accurate data. A focusing servo for tracking the data track, a tracking servo for tracking the data track well, a light emitting device for generating light, and a light receiving device for receiving the reflected light for position control of the head portion.

FIG. 1 is a plan view of a conventional slad type optical disk drive. As shown in FIG. 1, a conventional optical disk drive includes a pickup transport motor 10 and a pickup transport motor for driving the transport of the optical pickup device 40. Lead screw 20 connected to the rotary shaft of the 10, the rack gear 30 is installed to engage the screw bone of the lead screw 20, the guide feeder 31 to which the rack gear 30 is coupled, the guide feeder 31 ) Is coupled to the optical pickup device 40, the pickup feed shaft 21 for reciprocating the guide feeder 31, and the pickup feed shaft 21 on the opposite side to move the optical pickup device 50. It consists of a main shaft 22 to guide the.

As shown in FIG. 2, the actuator of the optical disk drive optical pickup device 40 is equipped with an objective lens 41 to perform focusing and tracking motion so that a certain size of focus is formed on the optical disk to write and read data. And a lens holder 42 for fixing the objective lens, a focusing coil 43 and a tracking coil 44 for generating a magnetic force to move the lens holder 42, and the lens holder with an elastic body 47. It has a fixed frame 45 to support through.

A pickup base 50 supporting the actuator on the bottom of the actuator of the optical disc drive optical pickup device 40 and incorporating a pickup optical system is configured as shown in FIG. The pickup optical system includes a light emitting element 51 made of a laser diode or the like so as to irradiate light, such as a laser beam, onto the optical disc 70, and a collimating lens for allowing the light emitted from the light emitting element 51 to be parallel after transmission. 52, an orthopedic prism 53 for transmitting transmitted light to a desired shape, a polarization beam splitter (PBS) 54 for selectively transmitting or reflecting incident light, and an optical disc 70 And a light receiving element 58 which receives the light reflected from the light beam and transmitted through the polarization beam splitter and is detected by the focusing lens 57.

Further, a λ / 4 plate (Quarter Wave Plate (QWP)) 55 is provided between the objective lens 49 and the optical disk 70 in front of the polarization beam splitter 54 along the traveling direction of the irradiated light.

In the optical pickup device configured as described above, the temperature of the light emitting element 51 gradually increases due to heat generated from the light emitting element 51 formed of the laser diode, and thus, the wavelength of light emitted from the laser diode is not effectively radiated. Since the chromatic aberration increases due to this change, there is a problem in that the performance of the optical pickup device is greatly reduced.

To solve this problem, the temperature sensor 46 is attached near the laser diode to adjust the output of the laser diode based on the temperature sensed by the temperature sensor 46 to prevent degradation of the recording signal. It also had a problem that the above problem is reproduced when the heat generation amount is large according to the user's use state without considering the limit.

On the other hand, the swing-arm type optical pickup device shown in Figure 4 is a VSI (VCM) actuator (5) hinged by a horizontal hinge (1) so as to rotate in a horizontal direction to the drive body, and the VSI A swing arm 2 hinged to the actuator 5 so as to rotate in a vertical direction, and a focusing actuator 6 for driving the swing arm 2 in a vertical direction, that is, a focusing direction.

Here, the swing arm 2 includes an optical system 3 configured as shown in FIG. 3 for recording and reproducing an optical disk, and an objective lens 4 provided at the end of the swing arm 2, The focusing actuator 6 is formed by winding a coil, a focusing coil 62 installed on the swing arm 2, and a permanent magnet 61 fixed to a drive body below the focusing coil 62. .

Similar to the slad type optical pickup device 40 shown in FIGS. 1 to 3, the swing arm type optical pickup device shown in FIG. 4 also changes the wavelength of light emitted from the laser diode due to heat generated from the light emitting element of the optical system. In addition, chromatic aberration is large, and the performance of the optical pickup device is greatly reduced.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and the heat dissipation system and the heat dissipation of the optical pickup device of the optical disk drive capable of realizing stable light emitting device performance by effectively dissipating heat generated in the light emitting device of the pickup optical system of the optical disk drive Its purpose is to provide a method.

In order to achieve the above object, the present invention provides an optical pickup device for an optical disc drive, comprising: a light emitting element for generating light irradiated onto the optical disc; A temperature sensor for sensing a temperature of the light emitting device; A structure in which the light emitting element is installed; A heat sink formed to efficiently dissipate heat; Heat sink contact means for contacting the heat sink and the structure; It provides a heat dissipation system of the optical pickup device of the optical disk drive, characterized in that configured to include.

This is to achieve stable light emitting device performance by effectively dissipating heat generated from the light emitting device of the pickup optical system of the optical disk drive.

Here, the structure is a pickup base of the slad optical pickup device, the heat sink contact means, the guide feeder to move integrally with the optical pickup device; A lead screw rotated in engagement with the rack gear coupled to the guide feeder; Including, it is effective that the optical pickup device is configured to move in contact with the heat sink according to the rotation of the lead screw.

The structure may be a swing arm of a swing arm type optical pickup device.

In addition, the contact between the heat sink and the structure is preferably made through a plate spring formed of a high thermal conductivity material. At this time, the leaf spring is effectively formed in the structure around the light emitting element.

On the other hand, according to another field of the invention, the present invention includes a temperature sensing step of detecting the temperature of the light emitting device for generating light irradiated to the optical disk; A heat sink contact step of contacting the optical pickup device with a heat sink having high thermal conductivity when the sensed temperature is equal to or higher than a predetermined temperature; It provides a heat radiation method of the optical pickup device of the optical disk drive, characterized in that for controlling the temperature of the light emitting device.

The heat sink contacting step may be performed by contacting the heat sink by moving the optical pickup device when the detected temperature reaches a predetermined temperature or more.

The method may further include storing operation information of the optical pickup device between the temperature sensing step and the heat sink contacting step.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

However, in describing the present invention, a detailed description of known functions or configurations will be omitted to clarify the gist of the present invention.

5 to 7 relate to a heat dissipation system of an optical pickup device of an optical disc drive according to an embodiment of the present invention, Figure 5 is a view showing the configuration of a heat dissipation system of an optical pickup device of a slad type optical disc drive, Fig. 6 5 is an enlarged perspective view of an enlarged portion A of FIG. 5, and FIG. 7 is a graph illustrating a temperature curve of a light emitting device according to a heat dissipation state.

As shown in FIG. 5, the heat dissipation system of the optical pickup apparatus of the optical disc drive according to the embodiment of the present invention includes a light emitting element 51 formed of a laser diode to generate light irradiated to the optical disc 70; The temperature sensor 46 installed around the light emitting element 51 to sense the temperature of the light emitting element 51, and the pickup base 50 around the light emitting element 51 to efficiently discharge heat from the high temperature light emitting element 51. A plate spring 59 formed of a material having high thermal conductivity, a heat sink 81 formed on the deck 80 to move the optical pickup device 40 in contact with the plate spring 59 to perform a heat dissipation function, and a pickup. It comprises a heat sink contact means for moving the base 50 in close contact with the heat sink 81 or the deck 80.

Here, the deck 80 is a member for forming a structure such as a case of an optical disk drive, and is formed of a material having high thermal conductivity to form the bottom surface of the heat sink 81 and to increase the heat radiation efficiency.

Further, the heat sink contact means is made by transfer mechanisms for transporting the optical pickup device. That is, as shown in Figure 1, the lead screw 20 rotated by the pickup transport motor 10, the rack gear 30 is installed to engage the screw bone of the lead screw 20, and the rack gear 30 Is coupled to constitute a guide feeder 31 integrally formed to transport the optical pickup device.

Further, the pickup base 50 may further include a memory such as a microcomputer (not shown) so as to store the work state in progress before the pickup base 50 moves toward the heat sink 81 for heat dissipation during the reproduction and recording of the optical disk. Effective in terms of continuity of work.

Hereinafter, the operating principle of one embodiment of the present invention will be described in detail.

When a user excessively continuously reproduces or records data using the optical disk drive, heat is continuously generated from the laser diode, which is the light emitting element 51, so that the temperature of the light emitting element 51 rises, and the temperature sensor 46 ) Detects the high temperature of the light emitting element 51, and when the detected temperature exceeds the set temperature T1, the heat dissipation circuit section stops the recording and reproducing operation in progress and stores the working state in the memory. The rotation of the pickup transport motor 10 is instructed. As a result, the optical pickup device 40 is moved through the lead screw 20 and the rack gear 30 in accordance with the rotation of the pickup transport motor 10 to allow the leaf spring 59 and the deck 80 of the pickup base 50 to move. ) Are in close contact with each other to allow heat exchange.

In a state where the leaf spring 59 and the deck 80 are in close contact with each other, the plurality of cooling parts are sequentially passed from the light emitting element 51 through the pickup base 50, the leaf spring 59 of the pickup base 50, and the deck 80. Heat is transferred to the heat sink 81 formed of fins. Heat is released through the heat sink 81 by conduction or convection to the outside. At this time, forced blowing to the heat sink (81) is preferable in terms of increasing the heat transfer rate.

Here, the leaf spring 59 formed in the pickup base 50 is installed to be in close contact with the deck 80 without precisely controlling the optical pickup device 40.

In general, the temperature change of the laser diode used in the optical pickup device 40 is as follows. As shown in FIG. 7A, when the heat dissipation is not performed smoothly, even if the user does not use it for a long time, the temperature of the light emitting device 51 rapidly increases from the beginning of use, and thus the wavelength range of the emitted light is increased. The allowance is exceeded, and the recording and reproducing performance of data is not properly implemented. And, as shown in Figure 7 (b), even in a heat dissipation system where the heat dissipation of the light emitting element 51 is weak, the time required to move out of the allowable temperature range is somewhat delayed, but eventually performs the function of the light emitting element 51 properly It is difficult to do.

The temperature of the light emitting element 51 of the effective heat dissipation system should be as shown in Fig. 7 (c), but according to the design constraints and the user's use condition according to the trend of miniaturization and light weight of the optical pickup device, It is very difficult to design with a stable tendency as in c). Therefore, by adopting the forced heat dissipation method as in the present invention, as shown in Figure 7 (d), if the temperature of the laser diode exceeds a predetermined temperature (T1) to force the heat dissipation to lower to a lower temperature (T2) to operate again This makes it possible to ensure stable performance of the light emitting element 51.

Meanwhile, in one embodiment of the present invention, the leaf spring 59 and the deck 80 formed on the pickup base 50 around the light emitting device 51 are configured to contact each other, but the pickup base 50 and the deck 80 are in contact with each other. May be in direct contact, and the contact surface is preferably in close contact to minimize the possible heat transfer resistance. For example, one surface of the pickup base 50 and one surface of the deck 80 may be precisely engaged, and may be formed as a contact surface having high surface roughness.

In addition, the heat sink contact means described above as an embodiment of the present invention to contact the heat sink 81 using the transfer mechanism of the optical pickup device 40 for its simple configuration, but to ensure the continuity of the operation of the optical pickup device The heat sink may be configured to be movable to be in contact with the pickup base 50. For example, it may be composed of a separate lead screw and the like that can transfer the heat sink (81).

The present invention is not limited to the above-described optical pickup apparatus of the slad optical disk drive, but can also be applied to the optical pickup apparatus of the swingarm type optical disk drive shown in FIG. That is, the swing arm is rotated to dissipate heat through the heat sink 81 installed on the deck 80 so that the side 3a of the portion where the optical system 3 is installed is in contact with the deck 80 to efficiently release heat. You can do it.

Although the preferred embodiments of the present invention have been described above by way of example, the scope of the present invention is not limited to these specific embodiments, and may be appropriately changed within the scope described in the claims.

As described above, the present invention provides a light emitting device for generating light irradiated onto an optical disk; A temperature sensor for sensing a temperature of the light emitting device; A structure in which the light emitting element is installed; A heat sink formed to efficiently dissipate heat; Heat sink contact means for contacting the heat sink and the structure; The present invention provides a heat dissipation system of an optical pickup device of an optical disk drive, which can realize stable light emitting device performance by effectively dissipating heat generated from a light emitting device of a pickup optical system of the optical disk drive.

Claims (12)

delete delete delete delete An optical pickup apparatus for an optical disc drive, A light emitting device for generating light irradiated onto the optical disk; A temperature sensor for sensing a temperature of the light emitting device; A structure in which the light emitting element is installed; A heat sink formed to efficiently dissipate heat; Heat sink contact means for contacting the heat sink and the structure; Including, The heat sink contact means may include: a guide feeder moving integrally with the heat sink; A lead screw engaged with the rack gear coupled to the guide feeder to rotate; The heat dissipation system of an optical pickup device of claim 1, wherein the heat sink is moved in contact with the optical pickup device as the lead screw rotates. The method of claim 5, And the structure is a pickup base of the optical pickup device. delete delete The method of claim 5, The structure is a heat dissipation system of the optical pickup device of the optical disk drive, characterized in that the swing arm of the optical pickup device. The method of claim 5, The heat dissipation system of the optical pickup device of the optical disk drive, characterized in that the contact between the heat sink and the structure is made through a leaf spring formed of a high thermal conductivity material. The method of claim 10, And the leaf spring is formed in the structure around the light emitting element. The method of claim 5, And a blower forcibly blown toward the heat sink, wherein the heat dissipation system of the optical pickup device of the optical disc drive.

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