JP2004273043A - Optical disk drive device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To perform high density recording having high reliability by suppressing the rise of temperature of surrounding of a laser source and a laser drive circuit. <P>SOLUTION: In an optical disk drive device for recording and reproducing data for an optical disk 3, an optical pickup 1 is formed by mounting the laser source 5 and the laser drive circuit 6 to a housing. The housing has a slant plate 7 protruding to a slant lower direction from a mounting position of the laser drive circuit 6. The laser drive circuit 6 is cooled by using a wind stream caused by the slant plate 7 when the housing is moved in the horizontal direction. Air stream can be caused in accordance with movement of the optical pickup by providing the slant plate protruding to a slant lower direction from a lower side of the mounting position of the laser drive circuit or a projection part for the housing of the pickup. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an optical disk drive, and more particularly to a recording type optical disk drive having a feature in a cooling mechanism of an optical pickup.
[0002]
[Prior art]
In a conventional optical disk drive, a laser light source is mounted in an optical pickup, and a laser drive circuit is mounted on a circuit board. The optical pickup and the circuit board are connected by a flexible circuit member such as an FPC.
[0003]
A conventional general optical disk drive will be described with reference to FIG. FIG. 6 is a schematic diagram showing a schematic configuration of a conventional optical disk drive device.
[0004]
As shown in FIG. 6, a conventional optical disk drive device 15 includes an optical pickup driving mechanism (not shown), an optical pickup 1, a spindle motor 2 for controlling the rotation of the optical disk 3, and a circuit board 16. ing. The laser drive circuit 6 is mounted on a circuit board 16, and the optical pickup 1 and the laser drive circuit 6 are connected by an FPC 18. Further, a fan 17 is mounted on the side surface of the housing to radiate heat inside the device.
[0005]
In recent years, optical disks of the phase change type and the organic dye type have appeared. In these recording methods, when one pit (data) is formed on a specific track on a disk, it is necessary to perform recording without affecting adjacent tracks. Further, as the density increases, it is necessary to sharply change the pit forming portion and the non-forming portion.
[0006]
Under such circumstances, a recording method called a so-called multi-pulse method is employed. In order to ensure the reliability of data, it is necessary to raise or lower the laser light source from reproduction power to recordable high power in nanoseconds (normally 1 to 3 nanoseconds). As this value is smaller, more reliable data recording becomes possible, and further high-density recording becomes possible.
[0007]
[Problems to be solved by the invention]
However, in a method of connecting a laser light source and a laser driving circuit using an FPC or the like as in the conventional technology, a stray capacitance in an intermediate circuit member made of an FPC or the like becomes a problem, and the rise and fall of a desired laser light source may be reduced. It is extremely difficult to obtain.
For this reason, a method of attaching the laser drive circuit to a place near the laser light source, that is, a housing of the optical pickup has been adopted.
[0008]
As described above, the high power and high speed startup of the laser light source results in high current and high speed switching from the viewpoint of the drive circuit, and the heat generated by the drive circuit causes the temperature of the optical pickup and the laser light source to rise, resulting in deterioration of the laser light source. It is a big problem. For this reason, a heat generation preventing means and a heat radiating means by an air cooling fan are provided, but it is still not enough to suppress a rise in temperature around the laser light source and the laser driving circuit.
[0009]
SUMMARY OF THE INVENTION The present invention has been proposed in view of the above circumstances, and has as its object to provide an optical disk drive device capable of performing high-reliability, high-density recording by suppressing a rise in temperature around a laser light source and a laser drive circuit. And
[0010]
[Means for Solving the Problems]
An optical disk drive device according to the present invention has a laser light source for irradiating a desired optical beam spot on an optical disk, and an optical system including an objective lens for focusing, tracking, and recording / reproducing of user data. Then, the light beam emitted from the laser light source passes through the optical system and is condensed by the objective lens to form a light beam spot, and after being focused on the reproducing / recording layer of the optical disk, becomes a reflected light. And returns to the light receiving element divided into a plurality of light receiving elements through the objective lens and the optical system, and focuses, tracks, and records user data of the light beam spot according to a light amount difference and a phase difference between the light receiving elements. -In an optical disk drive device having an optical pickup whose reproduction is controlled,
The optical pickup is formed by mounting the laser light source and the laser drive circuit on a housing, the housing has an oblique plate projecting obliquely downward from a mounting position of the laser drive circuit, and The laser drive circuit is cooled by using a flow of wind caused by the oblique plate when moving in a horizontal direction.
[0011]
In this case, it is preferable that both ends of the diagonal plate in the width direction are bent upward and inward.
[0012]
In addition, the diagonal plate has an opening substantially at the center of the base end side, and on the lower surface side of the diagonal plate and more distally than the opening, in a direction opposite to the direction in which the diagonal plate protrudes. It is preferable that a protruding auxiliary diagonal plate is provided, and the laser drive circuit is cooled using a flow of wind caused by the diagonal plate and the auxiliary diagonal plate when the housing moves in the horizontal direction.
[0013]
The optical pickup is formed by mounting the laser light source and the laser driving circuit on a housing, and the housing has a protruding portion in which the lower side of the mounting position of the laser driving circuit protrudes obliquely downward. The laser drive circuit may be configured to cool the laser drive circuit by using a flow of wind caused by the protrusion when the housing moves in the horizontal direction.
[0014]
Further, when the optical pickup is not moving and is in a servo-on state, the moving means of the optical pickup is forcibly intermittently driven to move the optical pickup from the inner side to the outer side and the outer side. , The laser drive circuit mounted on the optical pickup can be forcibly moved intermittently toward the inner peripheral side to cool the laser drive circuit.
[0015]
As described above, in the optical disk drive device according to the present invention, the laser drive circuit is insulated and mounted near the laser light source of the optical pickup housing containing the laser light source. Then, the flow of air (flow of wind) to the optical pickup generated when the optical pickup moves horizontally can be guided to the laser drive circuit section more effectively, and the laser drive circuit can be actively cooled.
Further, the optical disk drive device according to the present invention can cool the laser drive circuit section without providing an air cooling fan, so that the manufacturing cost can be reduced.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of an optical disk drive device according to the present invention will be described with reference to the drawings.
[0017]
<Cooling of laser drive circuit>
In order to start up the laser light source at a high speed by the laser drive circuit, the laser drive circuit must be as close as possible to the optical pickup in which the laser light source is provided, and the stray capacitance due to the wiring between the laser light source and the laser drive circuit must be suppressed. is important. However, since the laser drive circuit is also a heat source, it is indispensable to take measures for heat radiation in order to suppress the deterioration of the laser light source due to the heat generation.
[0018]
Therefore, in the optical disk drive device according to the embodiment of the present invention, a cooling unit is provided in the housing of the optical pickup in order to suppress the deterioration of the laser light source due to a rise in temperature and to start up the laser light source at high speed.
[0019]
<Example 1>
FIG. 1 is a schematic configuration diagram of the optical disk drive device according to the first embodiment of the present invention when viewed from the side.
[0020]
In the optical disc drive according to the first embodiment, as shown in FIG. 1, a laser light source 5 is attached to an optical pickup 1 so as to satisfy optical conditions, and a laser drive circuit 6 is provided near the optical pickup 1. It is mounted in an insulated state with respect to one housing.
[0021]
In this optical disk drive, a light beam emitted from a laser light source 5 is condensed by passing through an optical system 8 including an objective lens to become a spot-like light beam 4 and is focused on a reproduction / recording layer of the optical disk 3. After that, the light becomes reflected light, passes through the optical system 8 including the objective lens, returns to the light receiving element (not shown) divided into a plurality of light receiving elements, and spots according to the light amount difference and the phase difference between the light receiving elements. Focusing, tracking, and recording / reproduction of user data of the light beam 4 are controlled. The optical disk 3 is driven to rotate by the spindle motor 2.
[0022]
The housing of the optical pickup 1 has an oblique plate 7 projecting obliquely downward from the mounting position of the laser drive circuit 6. The diagonal plate 7 generates an air flow (indicated by the symbol a in FIG. 1) when the optical pickup 1 moves horizontally (left and right in FIG. 1) by an optical pickup driving mechanism (not shown). And serves to guide the laser drive circuit 6.
[0023]
The optical pickup 1 moves about 60 mm in 0.1 to 0.3 milliseconds. That is, when converted, an air flow of about 60 to 2100 m / h is generated. This flow of air allows the laser drive circuit 6 to radiate heat.
[0024]
Although FIG. 1 shows only the air flow (a) when the optical pickup 1 moves rightward on the paper for the sake of simplicity, the air directly hitting the laser drive circuit 6 is naturally shown. There is also a cooling effect. Due to the oblique plate 7, the heat of the laser drive circuit 6 flows upward, spreads due to the rotation of the optical disc 3, and a local rise in temperature is suppressed.
[0025]
<Example 2>
FIG. 2 is a perspective view of the optical pickup of the optical disk drive according to the second embodiment of the present invention.
[0026]
The optical disc drive according to the second embodiment further enhances the cooling effect of the oblique plate as compared with the optical disc drive according to the first embodiment. That is, as shown in FIG. 2, the housing of the optical pickup 1 according to the second embodiment has an oblique plate 9 projecting obliquely downward from the mounting position of the laser drive circuit 6. The slanted plate 9 has a bent portion 10 in which both ends in the width direction are bent upward and inward, and collects the air hitting the slanted plate 9 at the center to more effectively operate the laser driving circuit 6. It can be cooled.
[0027]
<Example 3>
FIG. 3 is a perspective view of the optical pickup of the optical disk drive according to the third embodiment of the present invention.
[0028]
The optical disk drive according to the third embodiment has a cooling effect further enhanced by the oblique plates, as compared with the optical disk drive according to the first and second embodiments. That is, as shown in FIG. 3, the housing of the optical pickup 1 according to the third embodiment has the oblique plate 11 protruding obliquely downward from the mounting position of the laser drive circuit 6. The diagonal plate 11 has an opening 12 substantially at the center on the base end side, and is located on the lower surface side of the diagonal plate 11 and on the tip side of the opening 12 in a direction opposite to the direction in which the diagonal plate 11 protrudes. A projecting auxiliary diagonal plate 13 is provided. The shape of the opening 12 may be any shape such as a square shape and a round shape.
[0029]
In the optical disk drive device according to the third embodiment, even when the optical pickup 1 moves left or right, the flow of air (indicated by reference numerals a and b in FIG. 3) is generated via the oblique plate 11 and the auxiliary oblique plate 13. The generated laser drive circuit 6 can be air-cooled.
[0030]
<Example 4>
FIG. 4 is a side view of an optical pickup of an optical disk drive according to Embodiment 4 of the present invention.
[0031]
The optical disk drive device according to the fourth embodiment is different from the optical disk drive devices according to the first to third embodiments in that a projection having the same function as the oblique plate is provided. That is, as shown in FIG. 4, the housing of the optical pickup 1 according to the fourth embodiment has the protrusion 14 in which the lower side of the mounting position of the laser drive circuit 6 projects obliquely downward. The protrusion 14 has a wedge shape, and generates a flow of air (indicated by a in FIG. 4) when the optical pickup 1 moves to the right.
[0032]
<Forced cooling of optical pickup>
The above-described oblique plates 7, 9, 11 and the protruding portion 14 are used to cool the laser drive circuit 6 by using the optical pickup 1 that moves at a high speed during use of the optical disk drive device and the air flow resulting therefrom. is there.
[0033]
However, in a state where the same track of the optical disk 3 is followed by the light beam 4 while the power is turned on, that is, in a standby state such as a so-called user command wait state, the optical pickup 1 hardly moves. In this case, the laser driving circuit 6 is also in the reproducing state and generates very little heat. However, there is a period in which the laser driving circuit 6 is in the recording state before that, and it is conceivable that the heat of the laser driving circuit 6 remains.
[0034]
The procedure for forcibly cooling the optical pickup 1 in such a case will be described with reference to FIG. FIG. 5 is a flowchart showing a procedure for forcibly cooling the optical pickup.
[0035]
That is, as shown in FIG. 5, it is determined whether or not the optical disk drive is in a standby state (S1). While the optical disk drive is being driven, the oblique plates 7, 9, 11, or the projection The flow of air is generated by the unit 14 to cool the laser drive circuit 6 and the like (S2).
[0036]
On the other hand, while the optical disk drive is on standby, the optical pickup 1 is forcibly moved intermittently to cool the laser drive circuit 6 and the like (S3).
[0037]
【The invention's effect】
As described above, in the optical disc drive device according to the present invention, the optical pickup housing is provided with an oblique plate or a projecting portion that projects obliquely downward from below the mounting position of the laser drive circuit. The air flow accompanying the movement of the pickup can be generated.
[0038]
Accordingly, the laser light source and the laser driving circuit can be cooled by the flow of the air, so that an optical disk drive device which is highly reliable and capable of high-density recording can be realized.
[0039]
Further, there is a possibility that a fan used for heat radiation of the optical disk drive may be omitted, which can contribute to cost reduction.
[0040]
Further, by bending both ends in the width direction of the oblique plate upward and inward, the flow of air by the oblique plate is increased, and the laser light source and the laser drive circuit can be more efficiently cooled.
[0041]
In addition, an opening is provided substantially at the center of the base end side of the diagonal plate, and an auxiliary diagonal plate that projects in a direction opposite to the direction in which the diagonal plate protrudes from the lower surface side of the diagonal plate to the distal end side of the opening. Is provided, it is possible to cool the laser light source and the laser drive circuit more efficiently.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of an optical disc drive device according to a first embodiment of the present invention when viewed from a side.
FIG. 2 is a perspective view of an optical pickup of the optical disk drive according to the second embodiment of the present invention.
FIG. 3 is a perspective view of an optical pickup of an optical disk drive according to a third embodiment of the present invention.
FIG. 4 is a side view of an optical pickup of an optical disk drive according to Embodiment 4 of the present invention.
FIG. 5 is a flowchart showing a procedure of forced cooling of the optical pickup.
FIG. 6 is a schematic diagram showing a schematic configuration of a conventional optical disk drive device.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 optical pickup 2 spindle motor 3 optical disk 4 light beam 5 laser light source 6 laser drive circuit 7 diagonal plate (Example 1)
8 Optical system 9 Oblique plate (Example 2)
10 Folded part 11 Slanted plate (Example 3)
12 Opening 13 Auxiliary diagonal plate 14 Projection 15 Optical disk drive 16 Circuit board 17 Fan 18 FPC

Claims (5)

A laser light source for irradiating a desired light beam spot on the optical disc, and an optical system including an objective lens for performing focusing, tracking, and recording / reproduction of user data,
The light beam emitted from the laser light source passes through the optical system and is condensed by the objective lens to become a light beam spot.After being focused on the reproduction / recording layer of the optical disc, the light beam becomes reflected light. After passing through the objective lens and the optical system, the light returns to the light receiving element divided into a plurality of light receiving elements, and the focusing and tracking of the light beam spot and the recording / reproducing of user data are performed according to the light amount difference and the phase difference between the light receiving elements. In an optical disc drive device having an optical pickup controlled by
The optical pickup is formed by mounting the laser light source and the laser drive circuit on a housing,
The housing has an oblique plate projecting obliquely downward from the mounting position of the laser drive circuit,
An optical disk drive device, wherein the laser drive circuit is cooled by using a flow of wind caused by the oblique plate when the housing moves in a horizontal direction. 2. The optical disk drive device according to claim 1, wherein both ends of the oblique plate in the width direction are bent upward and inward. The diagonal plate has an opening at substantially the center on the base end side, and protrudes in a direction opposite to the direction in which the diagonal plate protrudes, on the lower surface side of the diagonal plate and more distally than the opening. Provide an auxiliary diagonal plate,
3. The optical disk drive device according to claim 1, wherein the laser drive circuit is cooled by using a flow of wind generated by the diagonal plate and the auxiliary diagonal plate when the housing moves in the horizontal direction. A laser light source for irradiating a desired light beam spot on the optical disc, and an optical system including an objective lens for performing focusing, tracking, and recording / reproduction of user data,
The light beam emitted from the laser light source passes through the optical system and is condensed by the objective lens to become a light beam spot.After being focused on the reproduction / recording layer of the optical disc, the light beam becomes reflected light. After passing through the objective lens and the optical system, the light returns to the light receiving element divided into a plurality of light receiving elements, and the focusing and tracking of the light beam spot and the recording / reproducing of user data are performed according to the light amount difference and the phase difference between the light receiving elements. In an optical disc drive device having an optical pickup controlled by
The optical pickup is formed by mounting the laser light source and the laser drive circuit on a housing,
The housing has a projecting portion in which the lower side of the mounting position of the laser drive circuit projects obliquely downward,
An optical disk drive device, wherein the laser drive circuit is cooled using a flow of wind caused by the protrusion when the housing moves in a horizontal direction. By forcibly driving the moving means of the optical pickup when the optical pickup is waiting in a servo-on state where the optical pickup is not moving, the optical pickup is moved from the inner peripheral side to the outer peripheral side and from the outer peripheral side to the inner side. 5. The optical disk drive device according to claim 1, wherein the laser drive circuit mounted on the optical pickup is cooled by forcibly moving the laser drive circuit toward the peripheral side.

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