JP2009223981A - Optical pickup device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical pickup device having simplified constitution and reduced number of parts of mechanism for adjusting a position and a direction of a semiconductor laser element. <P>SOLUTION: A pair of projections 45 having circular-arc shape parts with a common center axis is provided at a holder 32 holding a semiconductor laser element 31, and V-grooves 34 corresponding to the projections are formed in an optical base 33. A direction of the semiconductor laser element is adjusted by pressing the projections of the holder to the V-groove of the optical base and rotating the holder. The same effect is obtained by performing tilt adjustment of a rising mirror 35 without providing mechanism for position adjustment of the semiconductor laser element. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an optical pickup device, and more particularly to an optical pickup device in which a position / angle adjustment mechanism of a semiconductor laser element is simplified.

  As shown in FIG. 1, the conventional optical pickup device includes an optical base 11, a semiconductor laser diode (LD) 12, a first holder 13 to which the LD 12 is fixed, and the first holder 13 as the optical base 11. A second holder 14 to be fixed and a spring 15 for attaching the first holder 13 to the second holder 14 are provided.

  The LD 12 is fixed to the first holder 13.

  The first holder 13 has a pair of cylindrical protrusions on both side surfaces, and the second holder 14 is attached to the second holder 14 by a spring 15 so that these cylindrical protrusions are positioned in a semicircular groove formed in the second holder 14. It is attached. The first holder 13 is rotatable with respect to the second holder 14 with the cylindrical protrusion as the center of rotation.

  The second holder 14 is screwed to the optical base 11. The second holder 14 is movable in at least one direction along the mounting surface of the optical base 11 in a state where the screw is loosened.

  The optical pickup device shown in FIG. 1 is assembled as follows.

  First, the LD 12 is attached to the first holder 13 and fixed with an adhesive or the like. Next, the first holder 13 is attached to the second holder 14, and the spring 15 is further attached to the second holder. As a result, the first holder 13 is held by the second holder 14. Next, the second holder 14 is attached to the optical base 11 and lightly screwed. Subsequently, the position of the LD 12 is adjusted by moving the second holder 14. Further, the first holder 13 is rotated with respect to the second holder 14 to adjust the direction of the LD 12. After adjustment, the position and orientation of the LD 12 are fixed with a fixing resin. FIG. 2 shows a state after assembly.

  As another conventional optical pickup device, the laser diode holder is pressed against the laser diode holder receiver provided on the optical base by using the first and second pressing plates, so that the position and orientation of the semiconductor laser can be adjusted. Some of them can be adjusted (see, for example, Patent Document 1).

  As another conventional optical pickup device, there is an optical pickup device in which only the direction of the semiconductor laser element can be adjusted, and the cylindrical portion formed in the holder is engaged with the groove surface formed in the receiver. (For example, refer to Patent Document 2).

JP 2007-102927 A JP 2003-45041 A

  Since the conventional optical pickup device can adjust the position and orientation of the semiconductor laser diode by combining two holders, there is a problem that the number of parts is large and the configuration is complicated. This is a problem common to the optical pickup device described in Patent Document 1. The optical pickup device described in Patent Document 2 also has a similar problem because it requires a receiver and a spring.

  Accordingly, an object of the present invention is to provide an optical pickup device in which the number of parts of a mechanism for adjusting the position and orientation of a semiconductor laser element is reduced and the configuration thereof is simplified.

  The optical pickup device of the present invention includes an optical base (33) and a holder (32) for holding the semiconductor laser element (31) for attaching the semiconductor laser element (31) to the optical base. The optical base includes a pair of V-shaped grooves (34) corresponding to the pair of cylindrical surface portions, and the pair of cylindrical surfaces is the pair of V-shaped. The holder can be rotated with respect to the optical base with the central axis as the center of rotation in a state where the holder is pressed against the groove.

  The optical pickup device of the present invention further includes a rising mirror (35) attached to the optical base, and the mounting angle of the rising mirror with respect to the optical base can be adjusted.

  The reference numerals in the parentheses are for the purpose of facilitating the understanding of the present invention and do not limit the present invention.

  According to the present invention, the holder for holding the semiconductor laser element includes a pair of cylindrical surface portions having a common central axis, and the optical base includes a pair of V-shaped grooves corresponding to the pair of cylindrical surface portions of the holder. The holder can be rotated with respect to the optical base with the pair of cylindrical surfaces pressed against the pair of V-shaped grooves of the optical base, thereby reducing the number of parts, simplifying the configuration, and reducing the cost. Can be reduced.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 3 shows a schematic configuration diagram of an optical pickup device according to an embodiment of the present invention.

  The optical pickup apparatus of FIG. 3 includes a semiconductor laser element (LD) 31, a holder 32 that holds the LD 31, and an optical base 33 to which the holder 32 is attached.

  A space for receiving the holder 32 is formed in the holder mounting portion of the optical base 33, and a pair of V-shaped grooves 34 are formed in the space. In addition to the LD 31, the optical base 33 is mounted with optical elements such as a rising mirror 35, light receiving elements, and the like.

  As shown in FIG. 4, the holder 32 has a frame shape and includes a large frame portion 41 and a small frame portion 42 having a smaller outer shape. At the four corners of the large frame portion 41, cutout portions 43 into which jigs used when the holder 32 is attached to the optical base 33 are inserted. A pair of protrusions 45 having a cylindrical surface portion 44 having a common central axis extending in the vertical direction in the figure are formed on the upper and lower surfaces of the small frame portion 42. The holder 32 is made of metal excellent in heat conduction in consideration of heat radiation of the LD 31.

  The LD 31 is inserted into the holder 32 from the large frame portion 41 side toward the small frame portion 42 side, and is fixed to the holder 32. The holder 32 to which the LD 31 is inserted and fixed is attached to the optical base 33 with the small frame portion 42 facing the optical base 33. The pair of V-shaped grooves 34 formed in the optical base 33 correspond to the protrusions 45 of the holder 32, and receive the protrusions 45 when the holder 32 is inserted into a space in the optical base.

  The void formed in the portion where the holder 32 of the optical base 33 is attached can be rotated within a certain range in a state where the projection 45 of the holder 32 is pressed against these V-shaped grooves 34. Moreover, it is slightly larger than the size of the insertion portion of the holder 32.

  By rotating the holder 32 in a direction inclined left and right about the central axis of the cylindrical surface portion 44 of the protrusion 45, the direction (exiting direction) of the LD 31 is adjusted, and the holder 32 is fixed to the optical base 33 with a fixing resin. The fixing resin is filled in the recess 51 shown in FIG. 5 and fixes both sides of the holder 32 to the optical base 33.

  In the optical pickup device according to the present embodiment, the mounting position of the LD 31 with respect to the optical base 33 cannot be adjusted. Therefore, the mounting angle of the rising mirror can be adjusted so that the same effect as that obtained by adjusting the position of the LD 31 can be obtained. Specifically, the rising mirror receiving portion of the optical element is configured to be slightly larger than the size of the rising mirror 35, the angle of the rising mirror is spatially adjusted, and then fixed to the optical holder 33 using a fixing resin. I am doing so.

  According to the present embodiment, since the semiconductor laser element is attached to the optical base using a single holder, the number of parts can be reduced and the configuration can be simplified.

  Further, since the holder and the optical base are in contact with each other, the heat dissipation is excellent.

  Although the present invention has been described with reference to one embodiment, the present invention is not limited to the above embodiment, and various improvements and modifications can be made within the scope of the present invention.

  For example, in the above embodiment, the V-shaped groove for receiving the protrusion of the holder is formed on the optical base. However, other shapes such as a semicircle may be used as long as the holder can be rotated with respect to the optical base. But you can.

It is a disassembled perspective view for demonstrating the conventional optical pick-up apparatus. It is a perspective view which shows the state after the assembly of the optical pick-up apparatus of FIG. It is a disassembled perspective view of the optical pick-up apparatus of this invention. It is an expansion perspective view of the holder used for the optical pick-up apparatus of FIG. It is the elements on larger scale of the optical pick-up apparatus of FIG. 3 for demonstrating the filling position of fixing resin.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Optical base 12 Semiconductor laser diode 13 1st holder 14 2nd holder 15 Spring 31 Semiconductor laser element 32 Holder 33 Optical base 34 V-shaped groove 35 Raising mirror 41 Large frame part 42 Small frame part 43 Cut part 44 Cylindrical surface part 45 Protrusion 51 Recess

Claims (4)

An optical base;
A holder for holding the semiconductor laser element to attach the semiconductor laser element to the optical base,
The holder includes a pair of cylindrical surface portions having a common central axis,
The optical base includes a pair of V-shaped grooves corresponding to the pair of cylindrical surface portions,
An optical pickup apparatus characterized in that the holder can be rotated with respect to the optical base with the central axis as a center of rotation in a state where the pair of cylindrical surfaces are pressed against the pair of V-shaped grooves, respectively. .   2. The optical pickup device according to claim 1, wherein the holder is fixed to the optical base with a resin in a state in which the mounting angle of the holder with respect to the optical base is adjusted.   The optical pickup device according to claim 1, further comprising a rising mirror attached to the optical base, wherein an attachment angle of the rising mirror with respect to the optical base is adjustable.   The optical pickup device according to claim 3, wherein the rising mirror is fixed to the optical base with a resin in a state in which the mounting angle of the rising mirror with respect to the optical base is adjusted.

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