JP2006252690A - Optical pickup - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical pickup which efficiently radiates heat generated from a light source, with less number of components and is also excellent in assembling performance and adjusting performance. <P>SOLUTION: The optical pickup is constituted of: a laser light source 1 which emits optical beams; a light source unit 2 on which the laser light source 1 is loaded; a holding member 13 which holds the light source unit 2; and a base 7 on which the holding member 13 and optical components are loaded, wherein an infrared radiation film 13 which converts heat into infrared rays so as to perform thermal radiation is formed on the surface of the holding member 13, thereby performing the thermal radiation of the heat generated by the laser light source 1 to the surroundings, so that the heat is efficiently radiated. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an optical pickup for optically recording and reproducing information on an information layer of an optical information recording medium (hereinafter referred to as an optical disk).

As a conventional optical pickup, 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 is disclosed in, for example, Patent Literature 1 is proposed. FIG. 4 is a diagram schematically showing a conventional optical pickup 90 described in Patent Document 1. As shown in FIG. In the figure, 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. Since such an elastic member 106 has a compact shape and the light source unit 104 can be attached to the base 105, the elastic member 106 having such a shape is widely applied to optical pickups.
Japanese Patent Laid-Open No. 2002-15451 (paragraph numbers 0018 to 0019, FIG. 1)

  However, the configuration disclosed in Patent Document 1 has the following problems. FIG. 5 is a perspective view of the elastic member 106, in which a convex portion 106a and a pair of crotch portions 106b are connected by a flat portion 106c. Attachment is performed by holding the light source unit 104 and the base 105 with a biasing force between the convex portion 106a and the pair of crotch portions 106b. Thus, since the light source unit 104 and the base 105 are sandwiched by the biasing force of the elastic member 106, for example, after adjusting the light beam 107 emitted from the light source unit 104 and the optical axis of the objective lens 102, the optical unit 104 is adjusted. If the light source unit 104 is sandwiched between the elastic member 106 and the base member 105 with the elastic member 106 that carries the generated heat to the base 105, the light source unit 104 is inevitably displaced at the time of clamping, and the light source unit 104 and the objective with the folding angle adjusted. There has been a problem that the optical axis with respect to the lens 102 is likely to be displaced.

  In addition, the pair of crotch portions 106b and the convex portion 106a are connected by the flat portion 106c, and the pair of crotch portions 106b and the back surface of the light source unit 104 are engaged in a planar shape, so that they are held between the elastic members 106. After that, even if an attempt is made to adjust the optical axis again for the deviation that has occurred during clamping by the elastic member 106, the movement of only the optical axis unit 104 is virtually impossible, and there is a problem that the mounting variation is large.

  Furthermore, since heat is radiated from the back surface of the light source unit 104 to the base 105 via the pair of crotch portions 106b and the convex portions 106a of the elastic member 106, the back surface of the light source unit 104, which is a heating element, and the pair of crotch portions. In addition to the small contact area with the portion 106b and the contact area between the base 105 and the elastic member 106 being the convex portion 106a, the fact that the contact area is small is a true bearer of heat dissipation from the light source unit 104 of the heating element. The contact area of the heat conducting portion to the base 105 is reduced, and there is a problem that heat cannot be efficiently radiated.

  An object of the present invention is to solve the above-described conventional problems, and to provide an optical pickup that efficiently dissipates heat generated from a laser light source and is excellent in optical axis adjustment.

  In order to solve the conventional problems, an optical pickup according to the present invention includes a laser light source that emits a light beam, a light source unit on which the laser light source is mounted, a holding member that holds the light source unit, the holding member, and And an infrared radiation film in which an infrared radiation material is formed on the surface of the holding member.

  An optical pickup according to the present invention includes a laser light source that emits a light beam, a light source unit on which the laser light source is mounted, a holding member that holds the light source unit, and a base on which the holding member and optical components are mounted. And an infrared radiation film in which an infrared radiation material is formed on the surface of the base.

  The infrared radiation material in the optical pickup preferably has a configuration in which the infrared radiation temperature range is effectively 100 ° C. or less.

  According to the configuration of the present invention, by forming an infrared radiation material that converts heat into infrared rays on the surface of the holding member or base that holds the light source unit, in addition to heat conduction to the holding member, Thermal radiation efficiently dissipates the heat generated from the laser light source, extends the life of the laser light source such as a semiconductor laser, enables stable operation of the laser light source even in high-temperature environments, and assembles with fewer parts It is possible to provide an optical pickup that is excellent in performance and adjustability.

  In the optical pickup according to the present embodiment, in addition to conducting heat generated from the laser light source to the holding member or the surface of the holding member or the base, the heat is further converted into infrared rays to emit heat. Because it has an infrared radiation film to conduct heat, it conducts heat from a laser light source to a large volume member such as a holding member or a base, and has a function of efficiently radiating heat by radiating heat to the periphery. ing. As a result, the lifetime of the laser light source can be extended and the laser light source can be stably operated even in a high temperature environment. Moreover, by providing the infrared radiation film on the holding member, base, etc., the infrared radiation film can radiate heat generated by the laser light source, and the conventional elastic member can be used when adjusting the optical axis between the laser light source and the objective lens. Even if it is not used, since the laser light source and the base can be fixed so that the optical axis is not shifted, the number of parts is small and excellent assemblability and adjustability can be obtained.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an exploded perspective view of an optical pickup according to the present embodiment, and FIG. 2 is a waist plan view of the optical pickup. 1 and 2, a laser light source 1 such as a semiconductor laser is mounted on a light source unit 2. The light source unit 2 is held by a holding member 13 and soldered to the flexible printed circuit board 3. The holding member 13 is adjusted and held on the base 7 through the adjustment member 17 so as to be optically optimal. The flexible printed circuit board 3 is connected to an optical pickup circuit unit (not shown). The optical pickup circuit unit emits the laser light source 1 and controls the optical pickup 16 that operates the objective lens driving device 12 (not shown). Connected to the main circuit.

  As shown in FIG. 3, the holding member 13 formed of a material such as metal or resin is formed with infrared radiation materials 13a and 13b that convert heat into infrared rays and radiate heat. As the infrared radiation materials 13a and 13b, for example, a material such as platinum, a platinum-containing material, or carbon is applied so that an effect of thermal radiation can be realized in a temperature range near the operation guarantee temperature of the laser light source 1. In addition, it is preferable that it is a material whose infrared radiation temperature range is 100 degrees C or less effectively.

  In addition, a deflecting mirror 8 that deflects the light beam emitted from the laser light source 1, a collimator lens 9 that condenses the divergent light of the light beam into parallel light, and a light beam that has been collimated by the collimator lens 9 are illustrated. The rising mirrors 10 that are vertically deflected with respect to the optical disk that is not to be mounted are mounted on the base 7. An objective lens driving device 12 equipped with an objective lens 11 that focuses a light beam on an optical disk board (not shown) and projects a light spot is mounted on the base 7 by adjusting the optical axis center of the laser light source 1. . The optical pickup 16 is constituted by these components.

  Next, the operation of the optical pickup 16 will be described. The light beam emitted from the laser light source 1 is guided to the collimating lens 9 by the deflecting mirror 8 to be condensed, becomes parallel light, and is vertically deflected by the rising mirror 10 with respect to the optical disk (not shown), and the objective lens 11. Is condensed to form a spot on the optical disc surface. The information signal recorded on the optical disc becomes an optical signal and is detected by the light receiving element 15. Depending on the detected optical signal, the optical pickup 16 is controlled from a main circuit (not shown), and the part on which the objective lens 11 of the objective lens driving device 12 is mounted is caused to follow the optical disc and decentering, The recording operation is performed by controlling the emission power of the light beam emitted from the laser light source 1, and the reproducing operation is performed.

  Here, when a light beam is emitted from the laser light source 1, heat is generated. Heat generated from the laser light source 1 is conducted through the holding member 13 and the adjusting member 17 to the base 7 having a large volume. Further, the heat accumulated in the holding member 13 is conducted to the adjusting member 17 and the base 7, and the infrared radiation films 13 a and 13 b formed on the surface of the holding member 13 generate infrared heat from the laser light source 1. Since the heat is radiated to the periphery of the optical pickup 16 by converting the light into heat and radiating heat, the heat can be efficiently radiated.

  According to such a configuration, when the elastic member is fixed to the base after the optical axis adjustment as in the conventional configuration, it is possible to suppress a problem that the optical axis adjusted at the folding angle is displaced, and from the holding member 13. Since the heat is directly radiated, the number of components can be reduced, and the optical axis adjustability can be dramatically improved. In addition, since the heat accumulated in the laser light source 1 can be reduced by actively dissipating heat as infrared rays by the infrared radiation films 13a and 13b, the life of the laser light source 1 can be extended and the laser of the heat caused by heat can be increased even in a high temperature environment. Characteristic deterioration such as threshold deviation can be prevented, the laser light source 1 can be operated stably, and stable laser control of the optical pickup 16 can be performed.

  When applied to a recordable optical disk, the high frequency module 4 is mounted on the flexible printed circuit board 3 in the vicinity of the laser light source 1 as is well known, but unnecessary radiation increases if the ground of the high frequency module 4 is weak. To do. In this embodiment, the material of the holding member 13 is a resin, and the material of the infrared radiation film 13a is formed on the holding member 13 by applying a material that can be soldered, such as platinum containing platinum or zinc. If the ground portion of the high frequency module 4 of the substrate 3 and the infrared material 13a of the holding member 13 can be soldered, the ground becomes stronger and unnecessary radiation generated from the high frequency module 4 can be reduced.

  In the present embodiment, the configuration in which the infrared radiation films 13a and 13b are provided on the entire surface of the holding member 13 on the adjustment member 17 side has been described, but for example, only the outer periphery of the laser light holding member 13 or only the outer periphery of the upper surface of the holding member 13 ( The configuration provided in 13a) of FIG.

  The infrared radiation film applied to the optical pickup 16 of the present invention is preferably provided in a member arranged as close as possible to the laser light source 1 that is a heating element. For example, in response to an improvement in recording density and a request for high-speed recording. The film may be formed on the adjusting member 17 and the base 7 having a surface area larger than that of the holding member 13. FIG. 6 is a perspective view of the base 7 applied to the optical pickup 16 in another embodiment of the present invention. As shown in the figure, an infrared radiation film 7a may be provided on the side surface of the base 7, an infrared radiation film may be provided on the upper surface 7b of the base 7, or both the side surface and the upper surface may be provided. . According to this configuration, the heat generated by the laser light source 1 is transferred to the base 7 by fixing the holding member 13 and the laser light source 1 to the base 7, and the infrared radiation film 7 a provided in the base 7. Etc. are converted into infrared rays and radiated to the outside of the base 7. Since the surface area of the base 7 is overwhelmingly larger than that of the holding member 13, for example, an optical pickup 16 with high heat dissipation efficiency can be provided. FIG. 7 is a perspective view of an adjustment member 17 applied to the optical pickup 16 in another embodiment of the present invention. Although the infrared radiation film 17 a is provided on the upper surface of the adjustment member 17, the heat radiation efficiency is high because the surface area is larger than that of the holding member 13 in this embodiment, and the heat radiation is closer to the laser light source 1 than the base 7. The conductivity is good, and the infrared radiation film 17a enables heat dissipation at a high rate.

  In the above embodiment, the example in which the holding member 13, the adjustment member 17, and the base 7 are each provided with an infrared radiation film has been described. However, the infrared radiation film is not limited to being provided in a single member. It goes without saying that the members constituting the pickup 16 and / or the objective lens driving device 12 can be selectively provided.

  As described above, the optical pickup 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, and in particular, converts the heat of a laser light source into infrared rays. By radiating heat to the periphery, the heat of the laser light source is efficiently radiated, the life of the laser light source is extended, and it is suitable for stable laser control of the optical pickup.

1 is an exploded perspective view of an embodiment of an optical pickup according to the present invention. The top view which shows the structure of the same embodiment The perspective view of the holding | maintenance part of the embodiment (A) is a plan view of a conventional optical pickup, (b) is a side view in the X direction, and (c) is a side view in the Hawaii direction. Perspective view of elastic member The perspective view of the base in other embodiment of this invention The perspective view of the adjustment member in another embodiment of this invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Laser light source 2 Light source unit 3 Flexible printed circuit board 4 High frequency module 7 Base 8 Deflection mirror 9 Collimating lens 10 Raising mirror 11 Objective lens 12 Objective lens drive device 13 Holding member 13a Infrared radiation film 16 Optical pick-up 17 Adjustment member

Claims (3)

A laser light source that emits a light beam;
A light source unit on which the laser light source is mounted;
A holding member for holding the light source unit;
A base on which the holding member and the optical component are placed;
An optical pickup comprising an infrared radiation film in which an infrared radiation material is formed on the surface of the holding member. A laser light source that emits a light beam;
A light source unit on which the laser light source is mounted;
A holding member for holding the light source unit;
A base on which the holding member and the optical component are placed;
An optical pickup comprising an infrared radiation film in which an infrared radiation material is formed on the surface of the base. An optical pickup characterized in that an infrared radiation temperature range of the infrared radiation material is effectively 100 ° C. or less.

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