JP2007035134A - Traverse device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical information recording/reproducing device which can efficiently dissipate heat generated from a light source, is small in the number of components, and is excellent in assemblability and adjustability. <P>SOLUTION: The optical information device 29 is provided with an optical pickup 16 constituted of a light source 1 for emitting optical beams and a light source unit 2 having the light source 1 mounted thereon, and a traverse mechanism having main and sub spindles as guide shafts for transferring the optical pickup 16 to the inner and outer peripheries of an optical information recording medium. An opposite surface 21 facing the emitting direction opposite surface of the optical beams of the light source 1 is formed in the traverse mechanism, and an infrared ray absorbing material 30 is deposited on the light source 1 side of the opposite surface 21. Thus, the heat generated by emitting optical beams from the light source 1 is absorbed into the traverse mechanism, thereby efficiently dissipating the heat. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a traverse apparatus that moves an optical pickup that transmits and receives an information signal to an information layer of a disc-shaped information medium (hereinafter referred to as an optical disc) in the radial direction of the optical disc.

As a conventional traverse apparatus, Patent Document 1 proposes a configuration including an elastic member that supports and fixes a light source unit to a base and conducts heat generated from a laser element mounted on the light source unit to the base. Has been. FIG. 8 is a diagram schematically showing the optical pickup disclosed in Patent Document 1. As shown in FIG. In FIG. 8, a laser element 101 that emits a light beam 107 is mounted on a heat sink 103 and constitutes a light source unit 104. A light beam 107 emitted from the laser element 101 is irradiated onto an optical disk board (not shown) by the objective lens 102. The light source unit 104 is supported and fixed to the base 105 by the spring property of the elastic member 106. The heat generated when the laser element 101 built in the light source unit 104 emits the light beam 107 has a function of conducting to the base 105 via the heat sink 103 and the elastic member 106.
Japanese Unexamined Patent Publication No. 2002-15451 (paragraph numbers 0018 and 0019 and FIG. 1)

  However, in the configuration disclosed in Patent Document 1, the attachment of the light source unit 104 and the base 105 is a spring biasing force between the concave portion 106a of the elastic member 106 and the pair of crotch portions 106b. After adjusting the optical axis of the light beam 107 and the objective lens 102 emitted from the unit 104, if the light source unit 104 is fixed to the base 105 with the elastic member 106, the adjusted optical axis is likely to be displaced, and the concave portion 106a and the crotch portion 106b is connected by a flat portion 106c, and the back surface of the light source unit 104 and the crotch portion 106b are engaged in a planar shape. Therefore, even if the optical axis is adjusted again after being sandwiched between the elastic members 106, the optical axis Since the movement of only the unit 104 is virtually impossible, there is a problem that the mounting variation is large and the heat dissipation effect varies. In addition, since heat is radiated from the back surface of the light source unit 104 to the base 105 via the crotch portion 106b and the concave portion 106a of the elastic member 106, the contact area of the heat conducting portion is reduced and heat cannot be radiated efficiently. There was also a problem. As described above, in order to solve the problem of the heat dissipation configuration disclosed in Patent Document 1, it is necessary to increase the contact area and volume of the heat sink 103 and the elastic member 106 to efficiently dissipate the heat generated from the light source unit 104. Therefore, there is a problem that the size of the light source unit 104 is increased, and as a result, the optical pickup is also increased in size.

  The present invention solves the above-described conventional problems, and forms a facing surface on the traverse mechanism that faces a surface opposite to the light beam emission direction of a laser light source, and an infrared absorbing material on the laser light source side of the facing surface It is an object of the present invention to provide an optical information recording / reproducing apparatus that efficiently dissipates heat generated from a laser light source, has a small number of parts, and is excellent in assemblability.

  In order to solve the conventional problems, a traverse apparatus according to the present invention includes an optical pickup having a light source that emits a light beam and an objective lens that focuses the light beam on an information layer of a disc-shaped information medium. A traverse device including a shaft member for guiding the movement of the information medium in the radial direction, the traverse device being in a direction orthogonal to the shaft member, and an emission center direction in which the light beam is emitted from the light source; An infrared absorbing member is provided in parallel with the back surface within a range in which the back surface moves along the shaft member with respect to the back surface on the opposite side.

  In addition, a traverse apparatus according to the present invention for solving the conventional problems is an optical pickup having a light source that emits a light beam and an objective lens that focuses the light beam onto an information layer of a disc-shaped information medium. A traverse device including a shaft member for guiding the movement of the information medium in the radial direction, the traverse device being in a direction orthogonal to the shaft member, and an emission center direction in which the light beam is emitted from the light source; An infrared radiation member is provided on the reverse side of the opposite side.

  Moreover, it is preferable to comprise so that the said infrared absorption member and the said infrared radiation member in the said traverse apparatus may oppose each other.

  Since the traverse device of the present invention has the above-described configuration, the infrared ray absorbing member efficiently absorbs and / or the infrared ray radiating member efficiently emits infrared rays generated due to the light source emitting a light beam. In addition, the light source can be stably operated even in a high temperature environment. Further, since the traverse apparatus of the present invention has a small number of parts and is excellent in assemblability, when applied to an information apparatus for recording and reproducing a user information signal with respect to an information layer of an information medium, an inexpensive and high-performance information apparatus can be obtained. Can be realized.

  According to a first aspect of the traverse apparatus of the present invention, the light beam is emitted from the light source in a direction orthogonal to a shaft member that guides the optical pickup including the light source in the radial direction of the information medium. In the range where the back surface moves along the shaft member with respect to the back surface opposite to the central direction, the infrared light absorbing member is provided in parallel with the back surface, so that the infrared absorbing member is from a light source caused by light beam radiation. The infrared rays can be efficiently absorbed, that is, the heat generated from the light source can be absorbed. As a result, heat generated from the light source can be transmitted to the traverse device having a large heat capacity, the life of the light source can be extended, and stable light source driving can be realized even in a high temperature environment.

  According to a second aspect of the traverse apparatus of the present invention, the light beam is emitted from the light source in a direction orthogonal to a shaft member that guides the optical pickup including the light source in the radial direction of the information medium. Since the infrared radiation member is provided on the back surface opposite to the central direction, the infrared rays generated by the light source can be efficiently emitted through the infrared radiation member, that is, the heat generated from the light source can be radiated. As a result, it is possible to realize a configuration in which the infrared radiation member promotes the heat radiation efficiency of the heat radiating member that radiates the heat generated by the light source, extends the life of the light source, and realizes stable driving of the light source even in a high temperature environment. be able to.

  Further, in the traverse device of the present invention described above, according to a preferred configuration in which the infrared ray absorbing member is provided in the traverse device, the infrared ray radiating member is provided in the heat radiating member, and the infrared ray absorbing member and the infrared ray radiating member are provided to face each other. In combination, the cooling efficiency of the heat generated from the light source can be further increased.

  In addition, as a material provided to the above-described infrared absorbing member and infrared emitting member, platinum, platinum-containing material, carbon, nickel, nickel alloy, etc. are raised, and can be applied alone or in a laminated or mixed form as necessary. Furthermore, it is preferable to apply the same material as both because the number of types of materials can be reduced.

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the traverse apparatus according to the present invention will be described below in detail with reference to the drawings (Embodiment 1)
FIG. 1 is a schematic diagram showing the configuration of an embodiment of the traverse apparatus of the present invention, and FIG. 2 is a partially enlarged view of the same embodiment. 1 and 2, a light source 1 such as a semiconductor laser is mounted on a light source unit 2. The light source unit 2 is soldered to the flexible printed circuit board 3. The light source 1 is adjusted and held on the base 7 together with the light source unit 2 so as to be optically optimal. The flexible printed circuit board 3 is connected to an optical pickup circuit unit (not shown). This optical pickup circuit unit is a signal for operating the objective lens driving device 12 for controlling the objective lens 11 to a desired position in order to cause the light source 1 to emit light or project a light spot on an optical disk board (not shown). And is connected to a main circuit (not shown) for controlling the optical pickup 16.

  The traverse mechanism is equipped with a main shaft 23 and a sub shaft 24 which are shaft members for mounting the optical pickup 16, and guides the movement of the optical disc in the radial direction. The spindle motor 22 is for rotating an optical disk (not shown) and is attached to a traverse mechanism. Further, in order to move the optical pickup 16 along the main shaft 23 and the sub shaft 24 to an inner peripheral position and an outer peripheral position of an optical disc (not shown), a transport mechanism is constituted by the transport motor 25, the transport shaft 26, and the transport member 27. . The spindle motor 22 and the transfer motor 25 are connected to a driving means (not shown), and the driving means is connected to a main circuit (not shown) in the same manner as the optical pickup 16 is connected to constitute an optical information device 29. ing.

  Here, the traverse mechanism is formed with a facing surface 21 that faces the surface opposite to the light beam emission direction (that is, the back surface) of the laser light source 1 of the optical pickup 16. An infrared absorbing member 30 is formed on the facing surface 21. Further, the facing surface 21 is formed with a sufficiently large area so that the optical pickup 16 always faces the light source unit 2 (that is, the back surface) with the same distance relationship even when the optical pickup 16 moves to the inner and outer peripheral positions of the optical disk. Yes. And as a material to be used for the infrared radiation absorbing member 30, platinum, platinum-containing material, carbon, nickel, nickel alloy, etc. are realized so that the effect of heat absorption can be realized in the temperature range near the actual use operation guarantee temperature of the light source 1. A material having a high heat absorption rate is preferred.

  Next, the operation of the optical information recording / reproducing apparatus 29 will be described. The light beam emitted from the light source 1 provided in the optical pickup 16 is condensed by the objective lens 11 through an optical component (not shown) attached to the base 7 to form a spot on the optical disc board surface. The information signal recorded on the optical disc is detected as a light signal by a light receiving element (not shown). The detected optical signal controls the optical pickup 16 and the optical information device 29 from a main circuit (not shown), and the optical pickup 16 and the optical information device 29 are transferred to the inner peripheral position or the outer peripheral position of the optical disc by the feed mechanism mounted on the traverse mechanism. The part on which the 12 objective lenses 11 are mounted is made to follow the optical disc surface or decentering with respect to the optical disc, the recording power is controlled by controlling the emission power of the light beam emitted from the light source 1, and the reproduction operation Or do.

  Here, when a light beam is emitted from the light source 1, heat is generated. The heat generated from the light source 1 is conducted and conducted to the base 7 having a large volume, and the volume is increased by the infrared absorbing member 30 formed on the opposing surface 21 of the opposing traverse mechanism (that is, the heat capacity). The heat of the light source 1 can be efficiently radiated by absorbing and transferring heat to the traverse mechanism. Even if the optical pickup 16 moves to the inner peripheral position or the outer peripheral position, the light source unit 2 and the facing surface 21 of the traverse mechanism always face each other at the same distance. Regardless of the outer circumference, the heat resulting from the emission of the light beam can be radiated and absorbed by the traverse mechanism to move the heat. Since the facing surface 21 has a sufficiently large area, even if the mounting variation occurs when the light source unit 2 including the light source 1 is optically optimally adjusted and fixed, the facing surface 21 and the light source unit 2 are opposed. If the predetermined gap d is effectively 0.5 mm to 3 mm, the optical pickup 16 and the traverse mechanism can be kept in contact with each other without being in contact with each other, and a stable heat radiation effect can be obtained. it can.

  According to such a configuration, the number of components can be reduced, and the heat radiation efficiency can be increased even if there is a fixed variation due to adjustment. Therefore, the life of the light source 1 is extended, and the characteristics such as laser threshold shift due to heat even in a high temperature environment Deterioration can be prevented, the light source 1 can be operated stably, and stable laser control of the optical pickup can be performed.

(Embodiment 2)
Next, another embodiment according to the traverse apparatus of the present invention will be described in detail with reference to FIGS. 3 to 5 are schematic views showing the configuration of the traverse device in the present embodiment, FIG. 6 is an exploded perspective view of the traverse device in the same embodiment, and FIG. 7 is a partially enlarged view in the same embodiment. . The difference from the first embodiment is that the light source unit 2 on which the light source 1 is mounted is provided with a heat radiating member 13 on the back surface opposite to the emission direction of the light beam emitted from the light source 1. That is, the infrared radiation member 14 is formed on the surface 13a on the surface 21 side.

  The heat dissipating member 13 is formed of a material such as metal or a heat conductive resin, and the infrared radiation member 14 formed on the surface 13a on the facing surface 21 side converts the heat into infrared rays to radiate heat, thereby opposing the traverse. The heat of the light source 1 can be efficiently radiated by absorbing and transferring heat to a large-volume traverse mechanism by the infrared absorbing material 30 formed on the facing surface 21 of the mechanism. Even if the light source unit 2 including the light source 1 including the heat radiating member 13 is optically optimally adjusted and fixed, a predetermined gap d between the surface 13a and the opposing surface 21 is effectively maintained. If the distance is set to 0.5 mm to 3 mm, the optical pickup 16 and the traverse mechanism can be kept in contact with each other without being in contact with each other, and a stable heat radiation effect can be obtained.

  Even in such a configuration, the number of parts can be reduced, and the heat radiation efficiency can be increased even if there is a fixed variation due to adjustment. Therefore, the life of the light source 1 is extended, and the characteristic deterioration such as laser threshold shift due to heat even in a high temperature environment. Can be prevented, the light source 1 can be operated stably, and stable laser control of the optical pickup can be performed.

  As a material applicable to the infrared radiation member 14 of the present embodiment, platinum, a platinum-containing material, carbon, nickel, a nickel alloy, or the like can be used alone or in combination as in the infrared absorption member 30.

  In this embodiment, the example in which the infrared radiation member 14 is formed on the heat radiating member 13 has been described. However, the infrared radiation member 14 may be formed at the interface between the heat radiating member 13 and the light source unit 2. The radiating member 14 may be directly formed on the light source unit 2 (that is, the heat radiating member 13 itself is replaced with the infrared radiating member 14). Moreover, although the example which uses the infrared rays radiating member 14 and the infrared rays absorption member 30 together was given in this embodiment, this is a preferable example which raises the thermal radiation efficiency of the heat | fever generated with the light source 1, but the infrared rays radiating member 14 Of course, the heat dissipation efficiency can be improved even if a single material is applied.

  In each of the above-described embodiments, the infrared absorbing member 30 is provided on the opposing surface 21, but the infrared absorbing member 30 needs to maintain the mutual positional relationship even when the optical pickup 16 moves in the radial direction of the optical disc. Therefore, the optical pickup 16 is formed substantially along the main shaft 23 or the sub shaft 24 that guides in the radial direction of the optical disc, and the back surface of the light source 1 is in a parallel relationship with the main shaft 23 or the sub shaft 21. It is preferable to configure. However, in general, the main shaft 23 side has many mechanisms for transferring the optical pickup 16 such as the transfer motor 25, the transfer shaft 26, and the transfer member 27 as shown in the figure, whereas the sub shaft 24 side has a transfer mechanism. Therefore, it is suitable as a position where the infrared absorbing member 30 is formed. In the above-described embodiments, the opposing surface 21 is described as being configured along the sub-axis 24. However, the distance between the infrared absorbing member 30 and the back surface is constant within the range in which the optical pickup 16 moves in the radial direction of the optical disk. For example, since the effect of the infrared absorbing member of the present invention is exactly the same, it is not necessarily formed along the sub shaft 24.

  In the above-described embodiments, the configuration in which the back surface of the light source 1 of the optical pickup 16 protrudes to the opposite side of the main shaft 23 with respect to the sub shaft 24 has been described, but the traverse width (equivalently, the width of the information device 29). If the restrictions on the direction are not severe, a configuration in which the back surface of the light source 1 is provided on the main shaft 23 side with respect to the sub shaft 24 is possible. In such a configuration, the infrared absorbing member 30 is formed between the sub shaft 24 and the back surface. be able to.

  Further, in any of the above-described embodiments, the infrared absorbing member 30 is formed on the opposing surface 21 provided in the traverse mechanism. However, the opposing surface 21 may be the infrared absorbing member 30 as a matter of course.

  In the above-described embodiment, the infrared absorbing material 30 is formed on the opposite surface 21 of the traverse mechanism. However, instead of the film formation, the surface is roughened to be uneven, and the surface 13a of the heat radiation member 13 of the optical pickup 16 is provided. The heat radiation from the infrared radiation member 14 formed on the surface may be scattered by surface roughening and absorbed by the opposing surface 21 formed on the infrared absorbing material 30.

  Moreover, if the heat radiating member 13 is attached after adjusting the laser light source 1 and the light source unit 2 on which the laser light source 1 is placed to be optically optimal, the surface 13a and the opposing surface 21 can be set substantially parallel to each other. The heat dissipation effect can be obtained.

  Further, as is clear from the above-described embodiment, when the traverse device of the present invention is applied to the optical information device 29, the heat generated from the laser light source is efficiently absorbed and emitted by the infrared absorbing member 30 and / or the infrared emitting member 14. In addition, by conducting heat to the traverse mechanism, the life of the light source 1 such as a semiconductor laser can be extended, the light source 1 can be stably operated even in a high temperature environment, and the number of parts is small and the assembly is excellent. An optical information device can be provided.

  As described above, the optical information recording / reproducing apparatus according to the present invention is useful as an apparatus for recording or reproducing a plurality of types of optical information recording media having a high recording density, such as a DVD. Converts and radiates heat, absorbs heat and transfers heat to a large volume traverse mechanism, efficiently dissipates heat from the laser light source, extends the life of the laser light source, and performs stable laser control of the optical pickup Is suitable.

The block diagram which shows the principal part of one Embodiment in the optical information apparatus of this invention The principal part structure enlarged view of the traverse apparatus in the embodiment The block diagram which shows the principal part of other embodiment in the optical information apparatus of this invention The perspective view which shows the structure of the same embodiment Rear perspective view showing the configuration of the same embodiment Exploded perspective view showing the configuration of the same embodiment The principal part structure enlarged view of the traverse apparatus in the embodiment Schematic diagram showing the configuration of a conventional optical pickup

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Light source 2 Light source unit 3 Flexible printed circuit board 7 Base 11 Objective lens 12 Objective lens drive device 13 Heat radiation member 13a Surface of heat radiation member 14 Infrared radiation member 16 Optical pick-up 21 Opposing surface 22 Spindle motor 29 Optical information device 30 Infrared absorption member

Claims (5)

A shaft member that guides the movement of the information medium in the radial direction of an optical pickup having a light source that emits a light beam and an objective lens that focuses the light beam on an information layer of the disk-shaped information medium A traverse device comprising:
In a range perpendicular to the shaft member, the back surface moving along the shaft member with respect to the back surface opposite to the emission center direction in which the light beam is emitted from the light source, and the back surface A traverse device comprising an infrared absorbing member in parallel. A shaft member that guides the movement of the information medium in the radial direction of an optical pickup having a light source that emits a light beam and an objective lens that focuses the light beam on an information layer of the disk-shaped information medium A traverse device comprising:
A traverse apparatus comprising an infrared radiation member on a back surface in a direction orthogonal to the shaft member and opposite to an emission center direction in which the light beam is emitted from the light source. The traverse device according to claim 1, wherein the infrared absorbing member and the infrared radiation member are configured to face each other. 4. The optical information recording / reproducing apparatus according to claim 3, wherein a material provided for the infrared absorbing member and a material provided for the infrared radiation member are the same material. Rotating means for rotating a disk-shaped information medium at a predetermined rotation speed, a light source for emitting a light beam to the information layer of the information medium, and an objective lens for condensing a light spot on the information layer by the light beam emitted by the light source An optical information apparatus comprising: an optical pickup including: a traverse apparatus according to any one of claims 1 to 4;

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