JP2008059712A - Pickup device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To properly radiate heat generated at a heated part of a pickup device used for recording or reproducing an optical disk. <P>SOLUTION: The pickup device 5 equipped with a light source for illuminating a laser beam comprises a driving means 102 for driving the light source, a connecting means 121 extending in the longitudinal direction having terminals to be electrically connected to external devices of the driving means and pickup device, and a radiating means 131 thermally coupled with the driving means and disposed on the connecting means in the longitudinal direction. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to the technical field of a pickup apparatus used for recording or reproducing one or a plurality of types of optical discs such as CD (Compact Disc: CD), DVD, and BD (Blu-ray Disc).

  In order to ensure the operational stability of this type of pickup device, for example, it is necessary to suppress the temperature rise of a heat generating part such as a drive circuit for driving a laser light source body.

  In order to meet such a demand, a technique of providing a heat sink on a circuit board can be adopted. In this technique, the heat generated in the heat generating portion is conducted to the heat radiating plate, and the conducted heat is conducted to the gas around the heat radiating plate, thereby suppressing the temperature rise of the heat generating portion. That is, the heat generated from the heat generating part is radiated from the heat radiating plate, thereby suppressing the temperature rise of the heat generating part.

JP 7-45922 A

  Due to the development of technology in recent years, the amount of heat generated at the heat generating portion has increased due to factors such as the complicated circuit configuration of the drive circuit. In this case, by increasing the thickness of the heat radiating plate, for example, by combining a plurality of sheet metals (in other words, cannot be configured with one sheet metal), by adopting a complicated shape of the heat radiating plate, A method of promoting heat dissipation by the heat sink can be considered. Such a complicated shape may lead to an increase in cost when manufacturing the heat sink. On the other hand, if the thickness of the heat radiating plate is kept thin, the heat radiating plate is deformed by the external pressure, and as a result, there is a risk of short-circuiting with the terminals on the circuit board.

  The present invention has been made in view of, for example, the above-described conventional problems, and an object of the present invention is to provide a pickup device that can suitably dissipate heat generated in, for example, a heat generating portion.

  In order to solve the above-described problem, the pickup device according to claim 1 is a pickup device including a light source that emits laser light, the driving unit driving the light source, the driving unit, and the outside of the pickup device. A connecting means that has a terminal electrically connected to at least one of them and extends in the long side direction, and is thermally connected to the driving means, and the connecting means along the long side direction of the connecting means And a heat dissipating means arranged on the top.

  The operation and other advantages of the present invention will become apparent from the embodiments described below.

  Hereinafter, as the best mode for carrying out the invention, description will be given of an embodiment according to a pickup device of the present invention.

  An embodiment of the pickup device of the present invention is a pickup device that includes a light source that emits laser light, and is electrically connected to a drive unit that drives the light source, and at least one of the drive unit and the outside of the pickup device. A connecting means having a terminal to be connected and extending in the long side direction, and a heat radiating means thermally connected to the driving means and disposed on the connecting means along the long side direction of the connecting means With.

  According to the embodiment of the pickup device of the present invention, the light source such as a laser diode is driven by the operation of a drive circuit such as a driver IC. Thereby, a laser beam is irradiated from a light source. As a result, for example, a recording operation and a reproducing operation for an optical disc such as a CD, a DVD, and a BD can be performed.

  In particular, the pickup device according to the present embodiment includes connection means such as a connection connector, which will be described later, on a circuit board on which, for example, drive means is arranged. The connecting means has a shape that extends in the long side direction. The term “extends in the long side direction” means a shape in which one side constituting the connecting means is longer than the other side adjacent to the one side and extends along the one side. It shows that it has. More specifically, the connection means has a rectangular shape or the like in cross section.

  On the connecting means, a heat radiating means thermally connected to the driving means is arranged along the long side direction of the connecting means. More specifically, the heat dissipating means has a shape that extends in the long side direction of the connecting means, and is disposed on the connecting means so as to follow the long side direction of the connecting means. Here, “thermally connected” means a state in which heat can be transferred directly or indirectly through a medium such as a heat conductive gel.

  According to the pickup device having such a configuration, the shape or area of the heat dissipation means can be relatively increased. For this reason, the heat generated in the driving means can be suitably radiated to the heat radiating means. As a result, the temperature rise of the drive means can be suitably suppressed.

  Furthermore, since the heat radiating means is disposed on the connection means, the strength of the heat radiating means (particularly, the strength against bending and twisting of the heat radiating means) can be ensured. That is, since the heat dissipating means is disposed on the connecting means, the heat dissipating means is supported by the connecting means, and as a result, the strength of the heat dissipating means can be ensured. Along with this, since the thickness of the heat radiating means can be reduced (that is, made thinner), the cost for manufacturing the heat radiating means can also be relatively reduced.

  In addition, if the heat dissipating means is arranged on the connecting means so that the terminal of the connecting means and the circuit board around the connecting means are covered with the heat dissipating means, the person who handles the pickup device may The inconvenience of coming into contact with the upper terminal or electronic component can also be suitably prevented. Thereby, it is possible to suitably prevent damage or short-circuiting (that is, short-circuiting) of the terminals of the connecting means, the terminals on the circuit board, or the electronic components. Furthermore, it is possible to suitably prevent a short circuit of the terminal of the connection means, the terminal on the circuit board, or the electronic component due to the adhesion of dust or dust.

  In one aspect of the embodiment of the pickup device of the present invention, the heat dissipating means is formed with at least one or a plurality of uneven portions (specifically, for example, a drawing by drawing).

  According to this aspect, the surface area can be increased by one or more concavo-convex portions as compared with the heat dissipation means in which the concavo-convex portions are not formed. For this reason, the heat radiation from the heat radiation means to the surrounding gas can be further promoted. Thereby, the heat generated in the driving unit can be more preferably radiated to the heat radiating unit, and the temperature rise of the driving unit can be more preferably suppressed.

  In the aspect of the pickup device including one or more uneven portions as described above, the one or more uneven portions are formed such that the one or more uneven portions extend along the long side direction of the connection means. ing.

  If comprised in this way, the presence of an uneven | corrugated | grooved part can ensure the intensity | strength (especially the intensity | strength with respect to the bending and the twist in the long side direction of a connection means) larger.

  In another aspect of the embodiment of the pickup device of the present invention, the heat radiating means includes the driving means, the connecting means, a portion between the light source and the connecting means, and between the driving means and the connecting means. It arrange | positions so that at least one part of this part may be covered.

  According to this aspect, a part of the circuit board between the light source and the connection means and a part of the circuit board between the drive means and the connection means are covered with the heat dissipation means. For this reason, the inconvenience that the person who handles the said pick-up apparatus contacts the terminal or electronic component on a circuit board can also be prevented suitably. Thereby, breakage or a short circuit (that is, short circuit) of terminals or electronic components on the circuit board can be suitably prevented. Furthermore, it is possible to suitably prevent a short circuit of a terminal or an electronic component on the circuit board due to adhesion of dust or dust.

  In another aspect of the embodiment of the pickup device of the present invention, the heat dissipating means is formed from a single plate member.

  According to this aspect, the heat radiating means can be formed by cutting or drawing on a single plate member. Thereby, the cost concerning manufacture of a thermal radiation means can be reduced relatively.

  Such an operation and other advantages of the present embodiment will be further clarified from examples described below.

  As described above, according to the embodiment of the pickup device of the present invention, the drive means, the connection means extending in the long side direction, the thermal connection with the drive means, and the long side direction of the connection means And a heat dissipating means disposed on the connecting means. Therefore, it is possible to suitably dissipate heat generated in the heat generating part such as the driving means.

  Embodiments of the present invention will be described below with reference to the drawings.

(1) Configuration of Disc Device First, the configuration of a disc device provided with a pickup device according to the present embodiment will be described with reference to FIG. FIG. 1 is an exploded perspective view of the disk device provided with the pickup device according to this embodiment.

  In FIG. 1, a disk device 1 is a disk device that reproduces information recorded on an optical disk 41 such as a DVD or a CD or records information on an optical disk 41, and includes an outer case 21 and an inner part of the outer case 21. An inner case 25 installed on the inner case 25, a disc tray 29 on which an optical disc 41 as an optical recording medium is provided so as to be able to advance and retreat relative to the inner case 25, and A main body 32 that performs reproduction or recording and a control board 40 that includes electronic components that control the operation of the main body 32 are configured.

  The outer case 21 includes an upper case 22 having an open lower surface and a front surface in FIG. 1, a lower case 23 that closes the lower surface of the upper case 22, and a decorative plate 24 that closes the front surface of the upper case 22. The overall shape is a flat rectangular parallelepiped.

  The inner case 25 has a bottom surface 26 having an upper surface and a front surface that are open and having a hole 261 at a substantially center, and a side surface 27 that is erected from the bottom surface 26.

  The disc tray 29 has a mounting recess 30 on which the optical disc 41 is mounted in a circular concave shape having an approximately plate shape and a diameter increasing upward. The disc tray 29 has a substantially rectangular opening 31 at a substantially central portion. The disk tray 29 is advanced and retracted by a tray driving means 28 provided in the inner case 25.

  The main body 32 includes a pedestal 33 having a hole 331 at the center and installed in the inner case 25, a rotation drive unit 34 provided on the pedestal 33 for rotating the optical disc 41, and a hole 331 of the pedestal 33. A pickup device 5 that moves from one edge to the other edge and irradiates the recording unit provided on the lower surface side of the optical disc 41 and detects reflected light, and a moving means 37 that moves the pickup device 5 forward and backward. It is prepared for. Here, the pedestal portion 33 is formed in a flat frame shape, and is installed such that the hole portion 331 of the pedestal portion 33 overlaps the hole portion 261 of the inner case 25. The rotation drive means 34 includes a turntable 35 that rotates with the optical disk 41 mounted thereon, and a spindle motor (not shown) as a power source that rotates the turntable 35. The turntable 35 includes a rotating shaft 351 that is inserted into the center hole 411 of the optical disc 41, and a flange portion 352 that protrudes in a flange shape on the outer peripheral surface of the rotating shaft 351 and on which the periphery of the shaft hole of the optical disc 41 is placed. ing. When the optical disc 41 is placed on the disc tray 29 and moved to the inside of the inner case 25, the optical disc 41 is placed on the turntable 35, and the upper surface of the optical disc 41 is on the side surface 27 of the inner case 25. It is pressed by a rotor 361 that is rotatably provided on the bridged support member 36. The optical disk 41 is rotated by the driving force of the spindle motor while being sandwiched between the turntable 35 and the rotor 361. The pickup device 5 will be described later with reference to FIG. The moving means 37 includes a pair of guide shafts 38 and a moving motor 39. Each of the guide shafts 38 is disposed so as to have an axial direction from one edge to the other edge of the hole portion 331 of the pedestal portion 33. A guide shaft 38 is inserted or engaged with the pickup device 5. The pickup device 5 is moved from one edge of the pedestal 33 to the other edge by the driving force of the moving motor 39.

  The control board 40 is provided below the pickup device 5 with a predetermined interval from the pickup device 5. The circuit board 40 has electronic components that perform rotation control of the moving motor 39 and the spindle motor.

(2) Reading Information Information reading of information on the optical disc 41 by the disc apparatus 1 having the above configuration will be described. First, the user pulls the disc tray 29 out of the outer case 21 and the inner case 25 and places the optical disc 41 on the disc tray 29. The disc tray 29 on which the optical disc 41 is placed is accommodated in the inner case 25. Then, the optical disk 41 is sandwiched between the turntable 35 and the rotor 361, and the optical disk 41 is rotated by the rotation of the turntable 35. At this time, laser light is emitted from the pickup device 5 toward the optical disc 41, and reflected light from the optical disc 41 is detected by the pickup device 5. Information is read from the optical disc 41 by detecting the reflected light. Further, the pickup device 5 irradiates a predetermined portion of the optical disc 41 with laser light by movement by the moving means 37. Then, predetermined information is sequentially read from the optical disc 41.

(3) Configuration of Pickup Device Next, the configuration of the pickup device 5 will be described with reference to FIG. FIG. 2 is a sectional view conceptually showing a section in the direction II in FIG. 1 of the pickup device according to the present embodiment. The same components as those already described are denoted by the same reference numerals, and the description thereof is omitted as appropriate.

  In FIG. 2, the pickup device 5 includes a pickup base 51 as a casing, a laser light source body 61 as a light source that is disposed on the pickup base 51 and irradiates a light beam onto an optical disk 41, and a laser emitted from the laser light source body 61. And an optical component 82 for guiding the light toward the optical disk 41.

  The pickup base 51 has a substantially thick plate shape, and one edge side is formed in an arc shape 52 (see a top view of FIG. 3) in accordance with the circular shape of the spindle motor 341. The pickup base 51 is made of synthetic resin or the like. The pickup base 51 is provided with an insertion hole 53 through which one guide shaft 38 is inserted, and an engagement portion 54 that has a substantially U-shaped cross section and sandwiches the other guide shaft 38 inside the U-shape. It is provided at the end. The pickup base 51 has a laser light source 61 and optical components on one side (lower side in FIG. 2). On the other hand, a laser emitting portion 57 that emits laser light toward the optical disc 41 is provided on the other surface side (upper side in FIG. 2).

  One end surface of the laser light source body 61 faces the outside from the laser light source body housing portion, and has a connector pin to which a power cable (not shown) or the like is connected. The laser light source 61 includes a DVD laser chip that outputs a laser beam for reproducing a DVD and a CD laser chip that outputs a laser beam for reproducing a CD, and outputs laser beams having two different wavelengths. Can do.

  The optical component 82 guides the laser light emitted from the laser light source body 61 toward the optical disc 41. As an optical component 82, a half mirror 821 that reflects laser light from the laser light source 61 at a right angle and parallel to one surface side of the pickup base 51, and a reflected light from the half mirror 821 at a right angle and the other surface of the pickup base 51 A reflection mirror 822 that reflects toward the side is provided. The laser beam reflected by the reflecting mirror 822 to the other surface side of the pickup base 51 is irradiated from the laser emitting unit 57 toward the optical disc 41. The optical component 82 also includes a PD (Photo Detector) that detects reflected light from the optical disc 41.

(4) Detailed Configuration of Pickup Device Next, a more detailed configuration of the pickup device 5 according to the present embodiment will be described with reference to FIGS. 3 to 5. 3 is a top view conceptually showing the top surface of the pickup device according to the present embodiment when the pickup device is observed from the z-axis direction of FIG. 1, and FIG. 4 is a top view of A in FIG. FIG. 5 is a side view conceptually showing a side surface of the pickup device according to the present embodiment when observed from the direction, and FIG. 5 is a view of the pickup device according to the present embodiment when observed from the direction B in FIG. It is a side view which shows a side conceptually.

  As shown in FIG. 3, the pickup device 5 according to the present embodiment is configured by arranging the above-described various configurations on a pickup base 51 and a circuit board 101.

  In particular, an LDD (laser diode driver) 102 for driving the laser light source 61 and a connection connector 121 for connecting the pickup device 5 and the control board 40 by, for example, flexible printed wiring are provided on the circuit board 101. Has been placed.

  The LDD 102 constitutes one specific example of the “driving means” in the present invention, and a laser light source body at a desired power and a desired timing based on a control signal output from the control board 40 via the connection connector 121. The laser light source body 61 is driven so that the laser light is output from 61. The LDD 102 is composed of an integrated circuit such as an IC.

  The connection connector 121 constitutes a specific example of “connection means” in the present invention, and is a connector to which a flexible printed wiring having one end connected to the control board 40 is connected. The connection connector 121 is made of resin or the like and has a rectangular parallelepiped shape, for example. The connection connector 121 has several to several tens of metal pins inside, and the corresponding terminals of the flexible printed wiring are connected to the metal pins to control between the control board 40 and the connector. Signals can be input and output.

  In the present embodiment, in particular, the heat dissipation plate 131 that covers the LDD 102 and has a shape extending in the direction along the long side of the connection connector 121 (in this embodiment, an L-shaped shape) includes the circuit board 101, the LDD 102, It is arranged on the connection connector 121. The heat radiating plate 131 constitutes a specific example of “heat radiating means” in the present invention.

  In particular, as shown in FIG. 4, the heat radiating plate 131 is bonded to the LDD 102 by a heat conducting gel 132 and is screwed to the circuit board 101. A part of the heat radiating plate 131 (specifically, a part having a shape extending in the direction along the long side of the connection connector 121) is arranged on the connection connector 121 as shown in FIG. . At this time, the heat radiating plate 131 is preferably arranged so as to cover at least a part of the circuit board 101 around the connection connector 121 and the terminal 122 for connecting the connection connector 121 and the circuit board 101. In addition, you may comprise so that the connection connector 121 and the heat sink 131 may closely_contact | adhere, or it may comprise so that it may adjoin with a predetermined space | interval.

  Further, as shown in FIG. 3, the heat sink 131 is dented from the surface of the heat sink 131 along the long side direction of the connection connector 121 by the drawing process (that is, the back of FIG. 3). Alternatively, two diaphragms 133 having a swollen shape (that is, swollen to the near side in FIG. 3) are formed.

  Furthermore, the heat sink 131 is formed of iron, stainless steel, aluminum, copper, or other metal materials. In particular, in the present embodiment, the heat radiating plate 131 is formed from a single plate-like metal material using cutting or drawing.

  The heat radiation from the LDD 102 performed using the heat radiation plate 131 will be described. When laser light is emitted from the laser light source 61, the LDD 102 for driving the laser light source 61 generates heat. The heat generated from the LDD 102 is transmitted from one end surface of the LDD 102 to the heat conducting gel 132 and further conducted to the heat radiating plate 131. This heat is eventually transferred to the entire heat radiating plate 131 and is radiated from the portion of the heat radiating plate 131 that touches the outside air to the outside air.

  In particular, since the heat sink 131 can be disposed along the connection connector 121, the surface area of the heat sink 131 can be relatively large. For this reason, the heat generated in the LDD 102 can be suitably radiated to the heat radiating plate 131. As a result, the temperature rise of the LDD 102 can be suitably suppressed.

  Furthermore, the surface area of the heat sink 131 can be further increased by the aperture 133 formed on the heat sink 131. For this reason, the heat dissipation from the heat sink 131 to the outside air can be further promoted. Thereby, the heat generated in the LDD 102 can be radiated to the heat radiating plate 131 more suitably, and as a result, the temperature rise of the LDD 102 can be more suitably suppressed.

  In addition, since the heat radiating plate 131 is disposed on the connection connector 121, the strength of the heat radiating plate 131 (particularly, the strength against bending or twisting in the long side direction of the connection connector 121) can be suitably ensured. That is, since the heat sink 131 is disposed on the connection connector 121, the heat sink 131 is supported by the connection connector 121, and as a result, the strength of the heat sink 131 can be ensured. Along with this, the thickness of the heat radiating plate 131 can be reduced (that is, made thinner), and thus the cost for manufacturing the heat radiating plate 131 can be relatively reduced.

  In addition, the terminals for connecting the connection connector 121 and the circuit board 101, the terminals on the circuit board 101 around the connection connector 121, and various electronic components are covered with the heat sink 131. Thereby, a person who handles the pickup device 5 (for example, a manufacturer, a repairer, or a user of a manufacturer) connects the connection connector 121 and the circuit board 101, a terminal on the circuit board 101, The inconvenience of contacting the electronic component can also be suitably prevented. Thereby, the terminal for connecting the connection connector 121 and the circuit board 101, the terminal on the circuit board 101, or the electronic component can be suitably prevented from being damaged or short-circuited (that is, short-circuited). Furthermore, it is possible to suitably prevent a short circuit between a terminal for connecting the connector 121 and the circuit board 101, a terminal on the circuit board 101, or an electronic component due to adhesion of dust or dust.

  In addition, since the heat radiating plate 131 can be formed from a single plate-like metal material, the cost for manufacturing the heat radiating plate 131 can be relatively reduced.

  In the above-described embodiment, the example in which the two diaphragms 132 are formed on the heat radiating plate 131 has been described. Of course, one diaphragm 133 may be provided, or three or more diaphragms 133 may be provided. The diaphragm 133 may not be provided. Even with this configuration, the heat generated in the LDD 102 can be dissipated. Further, the diaphragm 133 may not be along the long side direction of the connection connector 121. Even if comprised in this way, the surface area of the heat sink 131 can be increased relatively.

  Further, in addition to or instead of the aperture 133, a configuration in which the surface area of the heat radiating plate 131 is relatively increased (for example, uneven portions such as dents and protrusions) may be formed in the heat radiating plate 131. Even if comprised in this way, the surface area of the heat sink 131 can be increased relatively.

  Further, the heat radiating plate 131 may not be formed from a single plate-like metal material. For example, it may be formed from a multi-layered plate-like or massive metal material. Moreover, the processing method (that is, the manufacturing method of the heat sink 131) may be any method. In addition, the heat radiating plate 131 may be formed of various materials other than the metal material.

  The present invention is not limited to the above-described embodiments, and can be appropriately changed without departing from the gist or concept of the invention that can be read from the claims and the entire specification, and a pickup device with such a change Is also included in the technical scope of the present invention.

It is a disassembled perspective view of the disc apparatus provided with the pick-up apparatus based on a present Example. It is sectional drawing which shows notionally the cross section in the direction of II in FIG. 1 of the pick-up apparatus based on a present Example. It is a top view which shows notionally the upper surface of the pick-up apparatus based on a present Example at the time of observing a pick-up apparatus from the z-axis direction of FIG. It is a side view which shows notionally the side surface of the pick-up apparatus based on a present Example at the time of observing from the direction of A in FIG. It is a side view which shows notionally the side surface of the pick-up apparatus based on a present Example at the time of observing from the direction of B in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Disc apparatus 5 Pickup apparatus 41 Optical disk 51 Pickup base 61 Laser light source body 101 Circuit board 102 LDD
121 connector 131 heat sink 132 heat conduction gel 133 squeezing

Claims (5)

A pickup device including a light source that emits laser light,
Driving means for driving the light source;
A connecting means having a terminal electrically connected to at least one of the driving means and the outside of the pickup device, and extending in a long side direction;
A pickup device comprising: a heat dissipating means thermally connected to the driving means and disposed on the connecting means along a long side direction of the connecting means.   The pickup device according to claim 1, wherein the heat dissipating means has one or a plurality of uneven portions.   3. The pickup device according to claim 2, wherein the one or more uneven portions are formed such that the one or more uneven portions extend along a long side direction of the connecting means.   The heat dissipating means is arranged to cover at least a part of the driving means, the connecting means, a portion between the light source and the connecting means, and a portion between the driving means and the connecting means. The pickup device according to claim 1, wherein   The pickup device according to claim 1, wherein the heat dissipating means is formed from a single plate member.

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