JP5211118B2 - Optical pickup device - Google Patents

Description

  The present invention relates to an optical pickup device for recording and reproducing information on an optical disc.

  An optical pickup device is a device that is mounted on an optical disc device and controls laser light emitted when information is recorded on or read from the optical disc. Optical disc apparatuses are required to have an increased storage capacity, and in addition to conventional CDs (Compact Discs) and DVDs (Digital Versatile Discs), can support BDs (Blu-ray Discs) with improved recording density. It has been demanded. In recent years, optical disks having a higher recording capacity per sheet by forming a plurality of recording layers on one optical disk have been put into practical use.

  In such an optical disc having a plurality of recording layers, each recording layer has an intermediate layer for separating the signals so that the signals of the respective layers do not interfere when the optical pickup device reads or records information. Is formed between. As the number of layers increases, the number of intermediate layers increases, and the thickness from the optical disk surface to the recording layer changes, so that the influence of spherical aberration increases. This spherical aberration is caused when the amount of refraction of the light incident on the lens peripheral part away from the optical axis becomes excessive, and the focal length shifts closer to the lens. For this reason, it is known that the spherical aberration becomes more prominent as the numerical aperture of the lens increases and is generally proportional to the fourth power of the numerical aperture of the objective lens. In BD, in order to increase the recording density, it is necessary to reduce the diameter of the laser spot formed on the optical disc, and it is necessary to increase the numerical aperture. For example, while it was 0.45 for CD and 0.6 for DVD, it is 0.85 for BD, so spherical aberration is a big problem especially for BD.

  Therefore, in recent years, an optical pickup device equipped with a mechanism for correcting this spherical aberration has been proposed. As a typical mechanism, for example, by adding a collimator lens capable of changing the position in the optical axis direction in the optical path of the laser beam, the convergence and divergence state of the laser beam emitted from the laser element is controlled, A structure for correcting spherical aberration has been devised (Patent Document 1). However, such a mechanism requires a driving device such as a stepping motor for driving the collimator lens.

  Also, in an optical pickup device, many components that generate heat such as laser elements and electronic circuit components are mounted, and the temperature rise of the optical pickup device is a problem. In particular, the output characteristic of the laser element has a temperature characteristic that it deteriorates at a high temperature. Therefore, an excessive temperature rise leads to a decrease in the reliability of the optical pickup device, such as a decrease in information recording and reproduction accuracy and a breakage. For this reason, the optical pickup device is designed so that the laser element temperature is equal to or lower than the guaranteed temperature.

  Further, in an optical pickup device equipped with a mechanism for correcting spherical aberration, heat is generated when the stepping motor is driven to correct spherical aberration. At this time, since the laser element and the stepping motor are fixed on the same optical pickup housing, an excessive temperature rise of the stepping motor causes a temperature rise of the laser element.

  In particular, as the number of BD layers increases, the driving rate of the stepping motor increases and the amount of heat generation further increases. Therefore, an effective heat dissipation structure that prevents an excessive temperature rise of the stepping motor is essential.

  In order to solve this problem, in Patent Document 2, cooling is promoted by bending a part of the heat dissipation cover and bringing it into contact with the motor.

JP 2009-87382 A JP 2009-59457 A

  In the conventional structure, since the contact area between the motor and the heat dissipation cover is very small, it is necessary to further increase the heat dissipation amount in order to dissipate heat from the stepping motor in which the number of layers increases and the heat generation amount increases. From the viewpoint of cost and ease of assembly, a method of promoting cooling of the stepping motor by filling a fluidized heat-dissipating grease between the motor and the heat-dissipating cover so as to be thermally connected to the heat-dissipating cover is conceivable.

  And in order to improve the heat dissipation of the stepping motor that generates heat with the increase in the number of layers of the optical disk, it is necessary to increase the application area of the heat dissipation grease. However, if the application amount is increased in order to increase the application area, the fluid grease may leak to the movable part during assembly, and the movable part may be fixed, resulting in a problem that hinders driving of the motor. .

  Therefore, the present invention prevents the leakage of grease to the movable part without increasing the number of parts, thereby reducing the reliability of the device for correcting spherical aberration and reducing the accuracy of recording and reproducing information on the optical disk. An optical pickup device that solves the problem, and further an optical disk device are provided.

  In order to solve the above problems, for example, the configuration described in the claims is adopted. The present application includes a plurality of means for solving the above-described problems. For example, a laser element that is a laser light emitting unit, a laser light receiving unit, an optical element disposed on an optical axis, and the optical element Holding an optical element driving device for driving a laser, a heat dissipation cover thermally connected by the laser element, the optical element driving device and a heat conductive member, and an objective lens for condensing the laser light on an optical disk In the optical pickup device including the optical pickup housing, the optical element driving device includes a power source, the optical element, a support member that supports the optical element, and a guide member that is fixed in the optical axis direction of the optical element. A movable member that drives the support member in the optical axis direction along the guide member, and a fixed portion that fixes the movable member and the power source to the optical pickup housing It has the door, fixing surface for fixing the power source of the fixing member, characterized in that said are radiator cover abuts.

  Here, the laser element and the driving device may be thermally connected by filling a space with the heat radiation cover with, for example, fluid thermal conductive grease or adhesive. In the present invention, the power source may be a stepping motor, for example, and the optical element may be a collimator lens that changes the divergence or convergence state of the laser. The movable member may be a lead screw and a nut connected to the stepping motor.

  According to the present invention, in the optical pickup device having the optical element driving device, the heat dissipating grease filled in the space between the power source and the heat dissipating cover is moved by the lead screw and the nut by bringing the fixing member into contact with the heat dissipating cover. Therefore, it is possible to provide a highly reliable optical pickup device.

It is a schematic plan view which shows an example of schematic structure of an optical pick-up apparatus. It is a schematic perspective view of an example of the optical element drive device in the optical pickup device to which the first embodiment is applied. It is a schematic plan view which shows schematic structure at the time of seeing the optical pick-up apparatus shown in FIG. 1 from the back surface. It is a schematic sectional drawing of the optical element drive device to which 1st embodiment is applied when cut | disconnecting in the AA 'position of the optical pick-up apparatus shown in FIG. It is a schematic sectional drawing of the optical element drive device in the optical pick-up apparatus of a comparative example. It is the schematic sectional drawing which showed the structure of the optical element drive device in the optical pick-up apparatus to which 2nd embodiment was applied. It is a schematic sectional drawing which showed the structure of the optical element drive device in the optical pick-up apparatus to which 3rd embodiment is applied. It is the schematic sectional drawing which showed the structure of the optical element drive device in the optical pick-up apparatus to which 4th embodiment is applied. 1 is a schematic plan view showing a positional relationship between an optical disc device according to an embodiment of the present invention and an optical pickup device in the optical disc device. It is sectional drawing which shows the AA 'cross section in the said FIG. It is the top view which showed the external structure of the optical pick-up apparatus of FIG.

  Hereinafter, embodiments will be described with reference to the drawings.

(First embodiment)
FIG. 1A is a schematic plan view showing a schematic configuration of the optical pickup device 1, and FIG. 1B shows the optical pickup device 1 from which the heat dissipation cover 7a in FIG. It is a schematic plan view which shows the positional relationship of an apparatus. FIG. 2 is a schematic perspective view of the optical element driving device 20. FIG. 3 is a schematic plan view showing a schematic configuration when the optical pickup device 1 shown in FIG. 1 is viewed from the back surface. FIG. 4 is a schematic cross-sectional view of the optical element driving device 20 in the AA ′ cross section in the optical pickup device 1 shown in FIG. FIG. 5 is a schematic cross-sectional view of the optical element driving device 20 in the optical pickup device 1 of the comparative example.

  Details of the first embodiment will be described below with reference to the drawings.

  1A is a schematic plan view of the optical pickup device 1, and FIG. 1B is a schematic plan view showing a schematic configuration of the optical pickup device 1 from which the heat dissipation cover 7a in FIG. 1A is removed. is there. The optical pickup device 1 includes an optical pickup housing 6, a laser element 2 that is a laser emitting unit for recording and reproducing information on a rotating optical disk 9, and laser light 12 emitted from the laser element on the optical disk 9. A prism 11 and a mirror (not shown) for guiding, an objective lens 4 for condensing laser light on the optical disk 9, an objective lens driving device 5 for driving the objective lens 4, and a collimator disposed in the optical path of the laser light It has the lens 23, the optical element drive device 20 which drives the collimator lens 23, and the light receiving element 3 which detects a laser beam. Further, in order to dissipate heat generated from the laser element 2, a heat dissipation cover 7 a is attached to the optical pickup housing 6.

  FIG. 2 shows an example of the configuration of the optical element driving apparatus 20 to which the first embodiment is applied. The optical element driving device 20 includes a fixing member 25, a stepping motor 21 fixed to the fixing surface 25a of the stepping motor of the fixing member 25, a lead screw 21a connected to the stepping motor 21, a collimator lens 23, and a collimator A support member 22 that supports the lens 23, a nut 21 b that is joined to the support member 22 and screwed into the lead screw 21 a, and guide members 24 a and 24 b that are fixed to the optical pickup housing parallel to the optical axis direction of the collimator lens 23. Consists of. In the optical element driving device 20, the lead screw 21 a is rotated by the stepping motor 21. Accordingly, the nut 21b is driven, and the support member 22 is driven in the optical axis direction indicated by the arrow 12 along the guide members 24a and 24b in conjunction with the nut 21b, so that the collimator lens 23 can be driven.

  3 is a schematic plan view showing a schematic configuration when viewed from the back surface of the optical pickup device 1 shown in FIG. A heat radiating cover 7b is also mounted on the back surface of the optical pickup housing 6 in the same manner as the front surface.

  FIG. 4 shows a cross-section at the position AA ′ in the optical pickup device 1 shown in FIG. 3, and shows the configuration of the optical element driving device 20 to which the first embodiment is applied. The stepping motor 21 is fixed to the fixing surface 25 a of the fixing member 25, and is fixed to the optical pickup housing 6 by the adhesive 8 together with the fixing member 25. At this time, the fixing surface 25a bonded to the stepping motor 21 of the fixing member 25 is extended to substantially the same height as the heat dissipation cover 7b and is in contact with the heat dissipation cover 7b. Further, in order to thermally connect the stepping motor 21 and the heat radiating cover 7b, the heat radiating grease 30 is filled between the stepping motor 21 and the heat radiating cover 7b. The laser element 2 is bonded to the optical pickup housing 6 via a laser holder 2 a that holds the laser element 2. Similarly to the stepping motor 21, the laser element 2 is also filled with heat radiation grease 30 that is heat conduction grease in order to thermally connect the laser holder 2a and the heat radiation cover 7b. Thereby, the heat generated by driving the stepping motor 21 and the laser element 2 is transmitted to the heat radiating cover 7b and radiated from the heat radiating cover 7b to the atmosphere.

  As the material of each component, for example, magnesium die casting, zinc die casting, aluminum die casting, plastic or the like is used for the optical pickup housing 6 and the laser holder 2a. The fixing member 25 of the stepping motor 21 is made of an iron alloy or the like. Plastic is used for the support member 22 and the nut 21b. The heat radiating covers 7a and 7b are made of aluminum, copper, plated steel plate or the like. Further, the heat dissipating grease 30 may use a heat conductive adhesive or the like.

  Next, the principle of correcting the spherical aberration of the laser beam using the stepping motor 21 will be described with reference to FIG.

  Laser light 12 emitted from the laser element 2 is guided to the objective lens driving device 5 through a prism 11 and a mirror (not shown) fixed in the optical pickup device 1, and collected on the optical disk 9 by the objective lens 4. Lighted to form a spot. At this time, spherical aberration occurs when information is recorded on or read from the optical disk 9 having a different protective layer thickness or an optical disk 9 having a plurality of recording layers, and information recording / reproducing accuracy on the optical disk 9 is reduced. There is a problem of doing. Therefore, a collimator lens 23 for converting the diverging laser light into parallel light is arranged in the optical path of the laser light 12, and the collimator lens 23 is driven in the optical axis direction by the stepping motor 21, thereby converging and diverging the laser. And spherical aberration occurring on the optical disk 9 is corrected.

  On the other hand, when the number of layers is increased in order to improve the recording density of the optical disc 9, the driving rate of the device for correcting spherical aberration is improved. Along with this, the amount of heat generated by the stepping motor 21 increases, and the temperature rise of the stepping motor 21 becomes a problem. Therefore, it is necessary to improve the heat dissipation performance of the stepping motor 21.

  Here, heat dissipation of the stepping motor 21 will be described with reference to a schematic cross-sectional view of the optical element driving device 20 of the comparative example shown in FIG. When assembling the optical element driving device 20, first, the stepping motor 21 that rotates the lead screw 21 a is fixed to the fixing surface 25 a of the fixing member 25, and is fixed to the optical pickup housing 6 together with the fixing member 25 by the adhesive 8. . Next, the heat dissipation grease 30 having fluidity is applied to the stepping motor 21, and finally the heat dissipation cover 7b is attached. At this time, the stepping motor 21 that generates heat during driving and the heat radiation cover 7b are thermally connected by the heat radiation grease 30, and the heat of the stepping motor 21 is transmitted to the heat radiation cover 7b via the heat radiation grease 30 and is radiated. Therefore, in order to improve the heat dissipation performance of the stepping motor 21, it is necessary to increase the filling amount of the heat dissipation grease 30 and increase the application area. However, in the structure of the comparative example, when the filling amount of the heat dissipation grease 30 is increased, when the heat dissipation cover 7b is mounted, the stepping motor 21 part extends from the lead screw 21a and the nut 21b beyond the fixing surface 25a of the fixing member 25. The heat dissipating grease 30 is likely to leak into the movable part. If the heat dissipating grease 30 leaks to the movable part, it adheres to the lead screw 21a and the nut 21b, so that the lead screw 21a and the nut 21b cannot be driven and the spherical aberration cannot be corrected. Decreases.

  However, as shown in FIG. 4, in the optical element driving device 20 to which the first embodiment is applied, the fixing surface 25a of the stepping motor, which is a part of the fixing member 25, is extended to substantially the same height as the heat radiation cover 7b. In addition, since the fixed region 25a of the stepping motor that is in contact with the heat dissipation cover 7b separates the region filled with the heat dissipation grease 30 and the movable part composed of the lead screw 21a and the nut 21b, the heat dissipation cover 7b When incorporated in the pickup device 1, the heat-dissipating grease 30 is damped by the fixing surface 25 a of the stepping motor that is in contact with the heat-dissipating cover 7 b, thereby preventing the heat-dissipating grease 30 from leaking to the lead screw 21 a portion. It becomes possible.

  Further, by making the height of the fixing surface 25a of the stepping motor constant, the thickness filled with the heat radiation grease 30 can be kept constant when the heat radiation cover 7b is attached. Since the heat dissipating performance of the heat dissipating grease 30 is inversely proportional to the thickness, the heat dissipating performance of the stepping motor 21 at the time of assembly can be kept constant, and management at the time of assembly becomes easy.

  Further, by causing the fixing surface 25a of the stepping motor to come into contact with the heat radiating cover 7b, a path for radiating heat from the stepping motor 21 to the heat radiating cover 7b becomes a fixing member via the fixing surface 25a of the stepping motor in addition to the heat radiating grease 30. Since heat is also radiated from 25, the stepping motor 21 can be efficiently cooled. From the above, the heat-dissipating grease 30 leaks out to the lead screw 21a part, so that it is fixed to the movable part, preventing the correction of spherical aberration, and further, the heat-dissipating performance of the stepping motor 21 can be improved. It is possible to suppress a decrease in recording / reproducing accuracy of information on the optical disk 9.

(Second embodiment)
FIG. 6A is a schematic plan view of the optical pickup device 1 to which the second embodiment is applied as viewed from the back side, and FIG. 6B is an optical element drive at BB ′ in FIG. 2 is a schematic cross-sectional view of the device 20. FIG.

  As in the first embodiment (see FIGS. 1 and 2), the optical element driving device 20 includes a stepping motor 21, a lead screw 21a connected to the stepping motor 21, a collimator lens 23, and a collimator lens 23. And a nut 21b which is joined to the support member 22 and screwed into the lead screw 21a.

  At this time, the structure that separates the stepping motor 21 from the movable portion including the lead screw 21a and the nut 21b may not be formed by the fixing surface 25a of the stepping motor. For example, a part of the heat dissipation cover 7b may be part of the stepping motor 21. The bent portion 26a is bent toward the fixed surface 25a to form a refracting portion 26a, and the refracted portion 26a is brought into contact with the fixed surface 25a of the stepping motor 21 to fill the space between the stepping motor 21 and the heat dissipation cover 7b. The movable part composed of the heat dissipating grease 30, the lead screw 21a and the nut 21b may be separated. Thereby, when the optical pickup device 1 is assembled, it is possible to prevent the heat-dissipating grease 30 having fluidity from leaking out to the movable portion including the lead screw 21a and the nut 21b. Further, by bringing the heat dissipation cover 7b into contact with the fixing surface 25a of the stepping motor, the path for heat dissipation from the stepping motor 21 to the heat dissipation cover 7b is not limited to the path through the heat dissipation grease 30 but the fixing surface 25a of the stepping motor. Further, the number of paths that are transmitted to the heat dissipation cover 7b increases, and the stepping motor 21 can be efficiently cooled.

  Furthermore, since the contact area between the heat dissipation cover 7b and the heat dissipation grease 30 can be increased, the heat of the stepping motor 21 can be transmitted to the heat dissipation cover 7b more efficiently. From the above, the heat-dissipating grease 30 leaks out to the lead screw 21a part, so that it is fixed to the movable part, preventing the correction of spherical aberration, and further, the heat-dissipating performance of the stepping motor 21 can be improved. It is possible to suppress a decrease in recording / reproducing accuracy of information on the optical disk 9.

(Third embodiment)
FIG. 7 shows the optical element driving device 20 mounted on the optical pickup device 1 of the third embodiment, which is a modification based on the optical element driving device 20 mounted on the optical pickup device 1 of the first embodiment. Show.

  As in the first embodiment, the optical element driving device 20 includes a stepping motor 21, a lead screw 21 a connected to the stepping motor 21, a collimator lens 23, a support member 22 that supports the collimator lens 23, It consists of a nut 21b joined to the support member 22 and screwed into the lead screw 21a.

  Further, a part of the heat dissipation cover 7b is bent into a substantially L shape toward the fixed surface 25a of the stepping motor 21 to form a refracting portion 26a. By bringing the refracting portion 26a into contact with the fixed surface 25a of the stepping motor 21, the movable portion composed of the heat radiation grease 30, the lead screw 21a, and the nut 21b filled between the stepping motor 21 and the heat radiation cover 7b is separated. Thereby, when the optical pickup device 1 is assembled, it is possible to prevent the heat-dissipating grease 30 having fluidity from leaking out to the movable portion including the lead screw 21a and the nut 21b.

  Here, not only the refracting portion 26a of the radiating cover 7b and the fixing surface 25a of the stepping motor 21 of the fixing member 25 are brought into contact with each other, but also a protruding portion 25b is provided on the fixing surface 25a. A hole portion 26b of the heat dissipation cover may be provided in a portion corresponding to the protrusion portion 25b of the heat dissipation cover, and may be engaged so that the protrusion portion 25b of the fixed surface 25a is inserted. However, a hole may be provided in the fixed surface 25a, and a protrusion may be provided in a portion corresponding to the fixed surface 25a of the refracting portion 26a of the heat radiating cover which is a refracting portion of the heat radiating cover 7b.

  Further, by engaging the heat radiating cover 7b and the fixing member 25 of the stepping motor 21, the heat radiating path from the stepping motor 21 to the heat radiating cover 7b is not only the heat radiating grease 30 but also the heat radiating cover 7b via the fixing member 25. It can dissipate heat.

  Further, since the fixing surface 25a of the stepping motor and the heat dissipation cover 7b are engaged, the area where the heat dissipation cover 7b and the fixing surface 25a of the stepping motor are in contact increases, and the heat dissipation performance of the stepping motor 21 via the fixing member 25 is increased. Can be increased.

  Further, since the heat radiation cover 7b is engaged with the fixing member 25 when an impact such as dropping of the optical pickup device 1 is applied, the heat radiation cover 7b can be prevented from being lifted, and the heat radiation grease 30 and the heat radiation cover can be prevented. It can prevent that heat dissipation performance falls because the adhesiveness of 7b falls.

  From the above, the heat-dissipating grease 30 leaks out to the lead screw 21a part, so that it is fixed to the movable part, preventing the correction of spherical aberration, and further, the heat-dissipating performance of the stepping motor 21 can be improved. It is possible to suppress a decrease in recording / reproducing accuracy of information on the optical disk 9.

(Fourth embodiment)
FIG. 8 shows the optical element driving device 20 mounted on the optical pickup device 1 of the fourth embodiment, which is a modification based on the optical element driving device 20 mounted on the optical pickup device 1 of the first embodiment. Show.

  As in the first embodiment, the optical element driving device 20 includes a stepping motor 21, a lead screw 21 a connected to the stepping motor 21, a collimator lens 23, a support member 22 that supports the collimator lens 23, It consists of a nut 21b joined to the support member 22 and screwed into the lead screw 21a.

  At this time, the stepping motor 21 and the movable part composed of the lead screw 21a and the nut 21b do not have to be separated by the fixing surface 25a of the stepping motor 21 of the fixing member 25. 26 c may be formed, and the convex portion 26 c may be brought into contact with the fixing surface 25 a of the stepping motor 21 of the fixing member 25. Thereby, when the optical pickup device 1 is assembled, it is possible to prevent the heat-dissipating grease 30 having fluidity from leaking out to the movable portion including the lead screw 21a and the nut 21b.

  Further, the projection 26c formed on the heat radiation cover 7b is brought into contact with the stepping motor fixing surface 25a of the fixing member 25, so that the heat radiation path from the stepping motor 21 to the heat radiation cover 7b is only the path via the heat radiation grease 30. Instead, the heat is transmitted to the heat radiating cover 7b via the fixed surface 25a, and the stepping motor 21 can be efficiently radiated.

  At this time, the convex portion 26c formed on the heat dissipation cover 7b may be brought into contact with the stepping motor 21, and a path for heat dissipation from the stepping motor 21 to the heat dissipation cover 7b is formed, so that the stepping motor 21 is efficiently radiated. be able to.

  Further, the heat radiation cover 7b can be brought into contact with the fixed surface 25a of the stepping motor 21 without cutting out, and the heat radiation performance of the stepping motor 21 can be enhanced without reducing the strength of the heat radiation cover 7b.

  From the above, the heat-dissipating grease 30 leaks out to the lead screw 21a part, so that it is fixed to the movable part, preventing the correction of spherical aberration, and further, the heat-dissipating performance of the stepping motor 21 can be improved. It is possible to suppress a decrease in recording / reproducing accuracy of information on the optical disk 9.

(Fifth embodiment)
Next, an optical disk device including the above-described optical pickup device of the present invention will be described as a fifth embodiment of the present invention with reference to FIGS.

  FIG. 9 is a plan view showing an example of a schematic internal configuration of the optical disc device 121 on which the optical pickup device 101 is mounted. FIG. 10 is a plan view showing a schematic internal configuration of the optical disk device 121 on which the optical pickup device 101 is mounted. That is, FIG. 10 is a schematic view of the AA ′ cross section in FIG.

  As is apparent from these drawings, in the optical disc apparatus 121, the optical disc 107 loaded from the outside is rotated by the spindle motor 122 in the substantially box-shaped casing 100 (rotating direction 107a). The optical pickup device 101 is disposed under the mechanical cover 126 of the optical disc device 121. In the optical disc device 121, the air flow 108 is generated in the rotation direction of the optical disc 107 by the rotation of the optical disc 107, and flows through the gap 126 a between the optical disc 107 and the optical pickup device 101.

  FIG. 11 is a plan view showing a schematic internal configuration of the above-described optical pickup device 101. FIG. 11 shows the optical pickup device 101 on which the heat dissipation cover 112 and the objective lens driving device cover 106 are mounted. As is clear from FIG. 11, the optical pickup device 101 is movably supported by a main shaft 124 and a sub shaft 125 which are a pair of guide shafts. Then, by rotating the stepping motor 123, the lead screw 127 rotates, and the optical pickup device 101 connected to the member 128 engaged with the lead screw 127 moves in the radial direction of the optical disc 107. The objective lenses 133 and 134 of the optical pickup device 101 are supported by the objective lens support housing 132.

  In the optical disk apparatus 121 equipped with the optical pickup apparatus 101 described above, when performing a reproduction / recording operation, the optical disk 107 rotates in the direction of the arrow 107a (see FIG. 9 or FIG. 10). The rotational speed of the optical disk 7 reaches about 5500 rpm at the maximum in this example.

  According to the above, since a highly reliable optical pickup device is provided, a highly reliable optical disk device can be provided.

  In addition, this invention is not limited to an above-described Example, Various modifications are included. For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described. Further, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. Further, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment. Moreover, since the structure which attached | subjected the same code | symbol in each figure has the same function, those description may be abbreviate | omitted in another figure.

DESCRIPTION OF SYMBOLS 1,101 Optical pick-up apparatus 2 Laser element 2a Laser holder 3 Laser light receiving element 4 Objective lens 5 Objective lens drive apparatus 6 Optical pick-up housings 7a and 7b Radiation cover 8 Adhesive 9,107 Optical disk 11 Prism 12 Laser light 20 Optical element drive apparatus 21 Stepping motor 21a Lead screw 21b Nut 22 Support member 23 Collimator lenses 24a, 24b Guide member 25 Fixing member 25a Stepping motor fixing surface 25b Fixing protrusion 26a Radiation cover refracting portion 26b Heat dissipation cover hole 26c Convex 30 Thermal grease

Claims (6)

Laser element which is laser emitting part, laser receiving part, optical element arranged on optical axis, optical element driving device for driving optical element, laser element, optical element driving device and thermal conductivity In an optical pickup device having a heat dissipation cover thermally connected by a member, and an optical pickup housing that holds an objective lens for condensing the laser light on an optical disk,
The optical element driving device includes a power source, the optical element, a support member supporting the optical element, a guide member fixed in the optical axis direction of the optical element, and the support member along the guide member. A movable member that is driven in an optical axis direction; and a fixed member that fixes the movable member and the power source to the optical pickup housing,
An optical pickup device, wherein a fixing surface for fixing the power source of the fixing member is in contact with the heat radiating cover. The optical pickup device according to claim 1,
An optical pickup device, wherein a fixing surface for fixing the power source of the fixing member extends to substantially the same height as the heat radiating cover and is in contact with the heat radiating cover. The optical pickup device according to claim 1,
An optical pickup device, wherein a part of the heat dissipation cover is bent, and a tip thereof is in contact with the fixing member. The optical pickup device according to claim 1,
A part of the radiating cover has a refracting part, the refracting part has a hole, and the fixing member has a protrusion corresponding to the hole of the refracting part provided in the radiating cover, An optical pickup device, wherein the projection provided on the fixing member is inserted into the hole provided on the fixing member. The optical pickup device according to claim 1,
An optical pickup device, wherein a part of the heat radiating cover has a convex portion toward the fixing member, and a tip of the convex portion is in contact with the fixing member.   An optical disc device comprising the optical pickup device according to claim 1.

Images