JP2012009093A - Optical pickup device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical pickup device capable of simplifying the manufacture of a base and an optical component fixed to the base and easily positioning and fixing the optical component with respect to the base.
A plurality of projecting portions 18 are provided on an inner peripheral portion 17 of the base 12 and project in a plurality of different directions. The plurality of directions go inward of the recess 16. The optical component 11 is disposed in the recess 16 by being inserted in a predetermined direction. The optical component 11 has an outer peripheral portion 19, and the outer peripheral portion 19 faces the inner peripheral portion 17 of the base 12. The outer peripheral portion 19 is formed in a shape different from a circle when viewed in the predetermined direction. The outer peripheral portion 19 is pressed by the plurality of protrusions 18.
[Selection] Figure 1

Description

  The present invention provides light that irradiates and reflects light on a recording surface of an optical recording medium when any one or more of information reproduction, recording, erasing, and rewriting is performed on the optical recording medium. The present invention relates to an optical pickup device that receives light.

  As an optical pickup device according to a first conventional technique, an optical head including a light receiving element holder that holds a light receiving element, a slide base in which an insertion hole is formed, and a position adjusting member is known. The position adjusting member has a cylindrical portion, and a light receiving element holder that is one of optical components is bonded thereto. The cylindrical portion is inserted into the insertion hole of the slide base that becomes the base. After the cylindrical portion of the position adjusting member is inserted through the insertion hole of the slide base, positioning is performed. After the positioning is completed, the cylindrical portion is mechanically locked to the slide base. Thereafter, an adhesive is disposed and the adhesive is solidified to fix the cylindrical portion and the slide base, and the fixing of the light receiving element to the slide base is completed (see, for example, Patent Document 1).

  2. Description of the Related Art As an optical pickup device according to a second conventional technique, an optical pickup provided with a light emitting unit having a package containing a laser diode and a holder for supporting the package is known. This package, which is one of the optical components, is formed with a cylindrical collar, and a positioning recess is formed on the outer periphery of the collar. A holder serving as a base is formed with a circular fitting hole therethrough, and a positioning projection is formed on the inner periphery thereof. The circumferential dimension of the positioning protrusion is set equal to or slightly larger than the circumferential dimension of the positioning recess. The flange portion of the package is fitted into the fitting hole of the holder by pressing the positioning protrusion into the positioning recess (see, for example, Patent Document 2).

JP 2003-59066 A JP 2009-158023 A

  In the first prior art, a step of inserting the cylindrical portion of the position adjustment member into the insertion hole of the slide base, a step of locking the position adjustment member with respect to the slide base, a step of positioning, and an adhesion There is a problem that the step of arranging the agent and the step of solidifying the adhesive are required, and the step of fixing the light receiving element to the slide base is complicated. In addition, as the adhesive is solidified, the positions of the light receiving element and the slide base may change.

  In the second prior art, since the positioning and fixing of the package with respect to the holder can be performed by press-fitting the positioning protrusion of the holder with respect to the positioning recess of the package, positioning and fixing can be performed in one step. Therefore, there is a problem in that both the package and the holder need to be processed to form a portion to be press-fitted.

  An object of the present invention is to provide an optical pickup device that can simplify the manufacture of a base and optical parts fixed to the base, and can easily perform positioning and fixing of the optical parts with respect to the base. It is.

The present invention is a base on which a recess is formed,
A base having a plurality of protrusions provided in an inner peripheral portion defining the recess and protruding in a plurality of different directions toward the inside of the recess;
An optical component that is inserted and arranged in a predetermined direction in the recess,
Having an outer periphery facing the inner periphery,
The outer peripheral portion is formed in a shape different from a circle when viewed in the predetermined direction,
The outer peripheral portion includes an optical component pressed by the plurality of protrusions.

Further, in the present invention, the outer peripheral portion has a plurality of pressed portions that are pressed by the plurality of protruding portions,
A flat flat surface perpendicular to the direction in which each pressed portion is pressed against each projection is formed on each portion of the outer peripheral portion opposite to the pressed portion. .

In the present invention, at least two of the plurality of flat surfaces are adjacent to each other via a boundary line,
The inner peripheral portion is separated from a corner portion of the outer peripheral portion in the vicinity of the boundary line.

In the present invention, the optical component is inserted toward the base in one of the predetermined directions,
The base has a displacement prevention part for preventing displacement of the optical component to the one side,
The displacement prevention portion is formed with a displacement prevention surface that faces the other of the predetermined directions and contacts the optical component.

In the present invention, the optical component comprises:
A light receiving portion for receiving incident light;
An output unit that includes a substrate and that performs output in accordance with the amount of light incident on the light receiving unit;
The outer peripheral portion is made of a resin having a softening temperature lower than that of the material forming the substrate.

  According to the present invention, the plurality of protrusions are provided on the inner peripheral portion of the base and protrude in a plurality of different directions. Multiple orientations go inward of the recess. The optical component is inserted and disposed in the recess in a predetermined direction. The optical component has an outer peripheral portion, and the outer peripheral portion faces the inner peripheral portion of the base. The outer peripheral portion is formed in a shape different from a circle when viewed in the predetermined direction. Moreover, an outer peripheral part is pressed by several protrusion part.

  As a result, the outer peripheral portion of the optical component is pressed by the plurality of protrusions, so that the optical component can be fixed to the base. Since the optical component is formed in a non-circular shape, and the plurality of protrusions press the optical component in a plurality of different directions, the optical component can be positioned. Further, since the optical component can be arranged by press fitting, the arrangement, positioning and fixing of the optical component with respect to the base can be easily performed. Moreover, since an optical component is pressed by the some protrusion part, a part of inner peripheral part of a base and a part of outer peripheral part of an optical component can be spaced apart. Therefore, compared with the case where the whole outer peripheral part of an optical component contacts the whole inner peripheral part of a base, press injection of the optical component with respect to a base can be made easy. Moreover, since it is not necessary to form the site | part for positioning an optical component with respect to a base in an optical component, manufacture of an optical component can be made easy.

  According to the invention, the outer peripheral portion has a plurality of pressed portions, and the plurality of pressed portions are pressed by the plurality of protruding portions. A flat flat surface is formed on each portion of the outer peripheral portion opposite to each pressed portion. The planar flat surface is perpendicular to the direction in which each pressed portion is pressed by each protrusion. Thereby, it becomes possible to arrange | position an optical component in the state in which the some flat surface contacted the base. Therefore, the optical component can be reliably positioned with respect to the base.

  According to the invention, at least two of the plurality of flat surfaces are adjacent to each other via a boundary line. The inner peripheral portion is separated from the corner portion of the outer peripheral portion near the boundary line. Thereby, an optical component can be arrange | positioned in a desired position. If two planar surfaces are formed adjacent to each other on the inner periphery corresponding to the two flat surfaces of the optical component, two adjacent surfaces are adjacent to each other at the corner near the boundary between the two planar surfaces. One surface cannot be ideally formed, and a smoothly continuous curved surface is formed on these two surfaces. On the other hand, in the vicinity of the corner portion formed by the two flat surfaces, the inner peripheral portion is formed away from the corner portion, so even if a curved surface is formed on the inner peripheral portion, the corner portion of the optical component Can be prevented from being displaced from the ideal position.

  According to the invention, the optical component is inserted toward the base in one of the predetermined directions. The base has a displacement prevention part, and the displacement prevention part prevents displacement of the optical component to the one side. A displacement prevention surface is formed in the displacement prevention part. The displacement prevention surface faces the other of the predetermined directions, and the displacement prevention surface contacts the optical component. Accordingly, the optical component can be positioned by surface contact in a predetermined direction in which the optical component is inserted.

  According to the invention, the optical component further includes a light receiving unit and an output unit, and the light receiving unit receives incident light. The output unit is formed including a substrate and performs output in accordance with the amount of light incident on the light receiving unit. The outer peripheral portion is made of a resin having a softening temperature lower than that of the material forming the substrate. Thus, annealing can be performed at a temperature that is equal to or higher than the softening temperature of the resin forming the outer peripheral portion and lower than the softening temperature of the material forming the substrate included in the optical component. Therefore, the protrusion formed on the base can be bitten into the outer peripheral portion of the optical component, and the contact area between the protrusion and the outer peripheral portion can be increased. As a result, the optical component can be mechanically strengthened relative to the base as compared to the case where annealing is not performed.

It is a figure which shows the optical component 11 and the base 12 in one Embodiment of this invention, Fig.1 (a) is a top view of the optical component 11, FIG.1 (b) is the base 12 which has arrange | positioned the optical component 11. FIG. FIG. It is a perspective view of the base 12 in one Embodiment of this invention. It is a figure which shows the base 12 in one Embodiment of this invention, Fig.3 (a) is a top view of the base 12, FIG.3 (b) cuts the base 12 shown to Fig.3 (a) in a cut surface. It is sectional drawing seen from line S1-S1. It is a figure showing the structure of the optical pick-up apparatus 10 in one Embodiment of this invention. It is sectional drawing which looked at the base 12 and the photodetector 21 in one Embodiment of this invention from the side. It is a flowchart showing the assembly method of the optical pick-up apparatus 10 which concerns on one Embodiment of this invention.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. The embodiments described below are illustrated for embodying the technology according to the present invention, and do not limit the technical scope of the present invention. The technical contents according to the present invention can be variously modified within the technical scope described in the claims. The following description also includes a description of the optical pickup device 10 and a method for manufacturing the optical pickup device 10.

  FIG. 1 is a plan view of an optical component 11 and a base 12 according to an embodiment of the present invention. FIG. 1A is a plan view of the optical component 11, and FIG. 1B is a plan view of the base 12 on which the optical component 11 is arranged. FIG. 2 is a perspective view of the base 12 in one embodiment of the present invention. FIG. 3 is a diagram showing the base 12 in one embodiment of the present invention. FIG. 3A is a plan view of the base 12, and FIG. 3B is a cross-sectional view of the base 12 shown in FIG. 3A as viewed from the cutting plane line S1-S1. FIG. 4 is a diagram illustrating the configuration of the optical pickup device 10 according to an embodiment of the present invention.

  In the present embodiment, the optical pickup device 10 irradiates the recording surface of the optical recording medium 13 with light when any one or more of information reproduction, recording, erasing, and rewriting is performed on the optical recording medium 13. And a device that receives light reflected from the recording surface. Examples of the optical recording medium 13 include a compact disk (abbreviated as “CD”), a digital versatile disk (abbreviated as “DVD”), and a Blu-ray disc (abbreviated as “BD”: registered trademark). Can be mentioned.

  The optical pickup device 10 includes a base 12 and an optical component 11. The base 12 has a recess 16 and has an inner peripheral portion 17 and a plurality of protruding portions 18. The inner peripheral portion 17 defines the recess 16. The plurality of protrusions 18 are provided on the inner peripheral portion 17 and protrude in a plurality of different directions. The plurality of directions go inward of the recess 16. The optical component 11 is disposed in the recess 16 by being inserted in a predetermined direction. The optical component 11 has an outer peripheral portion 19, and the outer peripheral portion 19 faces the inner peripheral portion 17 of the base 12. The outer peripheral portion 19 is formed in a shape different from a circle when viewed in the predetermined direction. The outer peripheral portion 19 is pressed by the plurality of protrusions 18.

  In the present embodiment, the optical component 11 is the photodetector 21 and is arranged in a predetermined posture at a predetermined position in the optical pickup device 10. The optical pickup device 10 includes a housing 22, and the housing 22 integrally holds almost all the components of the optical pickup device 10 except for wiring. The base 12 is attached to the housing 22 and holds the photodetector 21. The base 12 is a holder for fixing and holding the photodetector 21, and is attached to the housing 22 at a predetermined position in a predetermined posture. Accordingly, the photodetector 21 is attached to the housing 22 via the base 12. This also fixes the photodetector 21 in the optical pickup device 10. In the present embodiment, the position adjustment of the photodetector 21 with respect to the base 12 and the position adjustment of the base 12 with respect to the housing 22 are not necessary.

  The optical recording medium 13 is irradiated with a light beam traveling in a direction perpendicular to the recording surface. When the direction perpendicular to the recording surface of the optical recording medium 13 arranged with respect to the optical pickup device 10 is referred to as an “irradiation direction” (X), FIG. 4A shows the optical pickup device 10 in the irradiation direction X. It is a figure showing the structure of the optical pick-up apparatus 10 when it sees. FIG. 4B is a diagram illustrating a configuration of the optical pickup device 10 when the optical pickup device 10 is viewed in a direction perpendicular to the irradiation direction X.

  As shown in FIGS. 4A and 4B, the optical pickup device 10 further includes a light source 24, a beam splitter 26, a collimator lens 27, a rising mirror 28, and an objective lens 32. Composed. The light source 24 is realized including a semiconductor laser element and emits light. The light beam immediately after being emitted from the light source 24 is divergent light. The beam splitter 26 transmits the light incident from the light source 24 side and advances the light to the collimating lens 27. The light source 24, the beam splitter 26, and the collimating lens 27 are arranged side by side along the optical axis L1 of the light beam emitted from the light source 24.

  When the optical axis direction of the light emitted from the light source 24 is referred to as an “emission direction” (Y), both the optical pickup device 10 is oriented in a direction perpendicular to the emission direction Y in FIGS. FIG. The collimating lens 27 converts the divergent light incident from the light source 24 side through the beam splitter 26 into parallel light and makes it incident on the rising mirror 28. The divergent light has a positive divergence angle.

  The rising mirror 28 reflects the light beam incident from the light source 24 side through the collimator lens 27, changes the traveling direction of the incident light beam, and advances the collimated light beam to the objective lens 32 as it is. The objective lens 32 condenses the parallel light incident after being reflected by the rising mirror 28 on the recording surface of the optical recording medium 13. A light bundle emitted from the light source 24 and reaching the recording surface of the optical recording medium 13 is referred to as “outgoing light” (33). The light after reaching the optical recording medium 13 and reflected on the recording surface is referred to as “return light” (34).

  The backward light 34 travels in the same optical path as the forward light 33 in the opposite direction to the forward light 33 until at least the collimating lens 27. The return light 34 incident on the collimator lens 27 as parallel light enters the beam splitter 26 as convergent light. The convergent light has a negative divergence angle. The return light 34 incident on the beam splitter 26 travels toward the photodetector 21 by being reflected and enters the photodetector 21. In addition to these components, the optical pickup device 10 may further include, for example, a λ / 4 wavelength plate, a hologram diffraction element, and the like. Further, if the optical path from the light source 24 to the optical recording medium 13 can be defined, the position of each component arranged in the middle of the optical path does not have to be this way, and the arrangement position can be changed.

  The optical component 11 further includes a light receiving unit 36 and an output unit, and the light receiving unit 36 receives incident light. The output unit performs output corresponding to the amount of light incident on the light receiving unit 36. In the present embodiment, the light receiving unit 36 included in the photodetector 21 has a planar light receiving surface, and the light receiving surface includes a plurality of light receiving regions. As shown in FIG. 1A, the light receiving surface is arranged at a part of the center of the photodetector 21. The photodetector 21 outputs a plurality of output values in accordance with the amount of light incident on each light receiving region. The direction perpendicular to the light receiving surface is a direction perpendicular to the irradiation direction X and the emission direction Y. When the direction perpendicular to the light receiving surface is referred to as a “light receiving direction” (Z), FIG. 4B is a diagram of the optical pickup device 10 viewed in the light receiving direction Z.

  Although the optical axis direction of the return light 34 that is reflected by the beam splitter 26 and travels toward the photodetector 21 may be not parallel to the light receiving direction Z but may form an angle, in this embodiment, the light from the beam splitter 26 The light beam traveling toward the detector 21 travels in the light receiving direction Z. The light detector 21 is formed in a rectangular shape when viewed in the light receiving direction Z in a state of being arranged with respect to the base 12. The photodetector 21 is formed in a rectangular parallelepiped, and the thickness dimension in the light receiving direction Z is set smaller than the dimension in the other direction. That is, the photodetector 21 is a flat plate-like member that is rectangular when viewed in the light receiving direction Z.

  The base 12 is generally formed in a flat plate shape, and is arranged with its thickness direction aligned with the light receiving direction Z. The base 12 has a rectangular outer shape when viewed in the light receiving direction Z, and a recess 16 is formed in the center. When the photodetector 21 is disposed on the base 12, the photodetector 21 is inserted into the recess 16 of the base 12 by moving in a predetermined direction. This predetermined direction coincides with the light receiving direction Z. The direction of movement with respect to the base 12 when the photodetector 21 is disposed is the light receiving direction one Z1. In other words, the more the photodetector 21 moves in the light receiving direction Z1 with respect to the base 12, the deeper the position of the photodetector 21 relative to the base 12 is located in the recess 16.

  Of the recesses 16 formed in the base 12, the shape of the light receiving direction one Z1 of the base 12 and the shape of the other light receiving direction Z2 are different from each other. Of the recesses 16, the shape of the other light receiving direction Z <b> 2 is substantially rectangular when viewed in the light receiving direction Z. A part of the light receiving direction one Z1 in the photodetector 21 is arranged in the space of the other light receiving direction Z2 in the recess 16. The space in the other light receiving direction Z2 formed in a rectangle is referred to as “light receiving direction other space” (39).

  The light receiving direction other space 39 is formed in an approximately rectangular shape when viewed in the light receiving direction Z, and the portions forming the respective sides are referred to as first to fourth side portions 41 to 44. The first side portion 41 faces the third side portion 43, and the second side portion 42 faces the fourth side portion 44. As shown in FIG. 1, when the first side portion 41 is arranged on the upper side and the third side portion 43 is arranged on the lower side, and the base 12 is viewed in the light receiving direction Z1, the second side portion 42 is located on the left side. The fourth side portion 44 is disposed on the right side.

  A protruding portion 18 that protrudes from the first side portion 41 toward the third side portion 43 is formed. The direction in which the first side portion 41 extends long is referred to as “first direction” (W1), and the direction in which the second side portion extends long is referred to as “second direction” (W2). 18 protrudes in the second direction W2 from approximately the center of the first side portion 41 in the first direction W1. The protrusion 18 provided in the first side portion 41 may be referred to as a “first protrusion” (46). From the second side portion 42, a protruding portion 18 that protrudes toward the fourth side portion 44 is formed. The protrusion 18 in the second side portion 42 protrudes in the first direction W1 from approximately the center in the second direction W2 of the second side portion 42. The protrusion 18 provided on the second side portion 42 may be referred to as a “second protrusion” (48).

  The dimension of the first side part 41 in the first direction W1 is about 3 mm, and the dimension of the second side part 42 in the second direction W2 is also about 3 mm. The dimension of the first protrusion 46 in the second direction W2, that is, the protrusion amount is set to approximately 100 μm. The dimension of the second protrusion 48 in the first direction W1, that is, the protrusion amount is set to about 100 μm. The dimension of the first protrusion 46 in the first direction W1, that is, the width dimension is set to about 300 μm, and the dimension of the second protrusion 48 in the second direction W2, that is, the width dimension is set to 300 μm.

  The outer peripheral portion 19 has a plurality of pressed portions 49, and the plurality of pressed portions 49 are pressed by the plurality of protruding portions 18. A flat flat surface 51 is formed on each portion of the outer peripheral portion 19 on the side opposite to each pressed portion 49. The flat flat surface 51 is perpendicular to the direction in which each pressed portion 49 is pressed against each protrusion 18. At least two of the plurality of flat surfaces 51 are adjacent to each other via a boundary line. The inner peripheral portion 17 is separated from the corner portion of the outer peripheral portion 19 in the vicinity of the boundary line. In FIG. 2, a portion of the inner peripheral portion 17 that is in contact with the flat surface 51 of the photodetector 21 is indicated by hatching.

  A flat surface 51 perpendicular to the second direction W2 is formed in an intermediate portion excluding both ends in the first direction W1 of the third side portion 43, and an intermediate portion excluding both ends in the second direction W2 of the fourth side portion 44. In the portion, a flat surface 51 perpendicular to the first direction W1 is formed. The photodetector 21 is sandwiched between the first projecting portion 46 and the flat portion of the third side portion 43, and relative displacement in the second direction W2 with respect to the base 12 is prevented. The photodetector 21 is sandwiched between the second projecting portion 48 and the flat portion of the fourth side portion 44, and relative displacement in the first direction W1 with respect to the base 12 is prevented.

  Therefore, the photodetector 21 is fixed to the base 12 by an interference fit, and when the light detection unit is disposed in the recess 16 of the base 12, the light detection unit is inserted into the light receiving direction one Z1 by press-fitting. Arranged. In addition, the relative angular displacement of the light detection unit with respect to the base 12 is prevented from being angularly displaced about the axis in any direction. Although a part of the outer peripheral portion 19 of the photodetector 21 is disposed close to the first side portion 41 in the vicinity, the first projecting portion 46 is in contact with the photodetector 21. Is slightly separated from the outer peripheral portion 19 of the photodetector 21. In addition, a part of the outer peripheral portion 19 of the photodetector 21 is disposed close to the second side portion 42, but the second protruding portion 48 contacts the photodetector 21, so that the second side portion 42 is slightly separated from the outer peripheral portion 19 of the photodetector 21.

  The flat surface 51 of the third side portion 43 and the flat surface 51 of the fourth side portion 44 are arranged in contact with the outer peripheral portion 19 of the photodetector 21. On the other hand, a part of the inner peripheral portion 17 that defines the light receiving direction other space 39 of the third side portion 43 in the vicinity of both ends in the first direction W1 is an outer peripheral portion of the photodetector 21 disposed in the recess 16. Separated from 19. That is, the surface that defines the corner space sandwiched between the second side portion 42 and the third side portion 43 from the third side portion 43 side is second than the flat surface 51 formed on the third side portion 43. It is formed by slightly retracting in the direction toward the third side portion 43 in the direction W2. Further, the surface defining the corner space between the third side portion 43 and the fourth side portion 44 from the third side portion 43 side is in the second direction than the flat surface 51 formed in the third side portion 43. It is formed by slightly retracting in the direction toward the third side portion 43 of W2.

  A part of the inner peripheral portion 17 that defines the other light receiving direction space 39 of the fourth side portion 44 is separated from the outer peripheral portion 19 of the photodetector 21 disposed in the recess 16 in the vicinity of both ends in the second direction W2. To do. That is, the surface that defines the corner space between the first side portion 41 and the fourth side portion 44 from the fourth side portion 44 side is first than the flat surface 51 formed on the fourth side portion 44. It is formed by being slightly retracted in the direction toward the fourth side portion 44 in the direction W1. Further, the surface defining the corner space between the third side portion 43 and the fourth side portion 44 from the fourth side portion 44 side is in the first direction than the flat surface 51 formed on the fourth side portion 44. It is formed by slightly retracting in the direction toward the fourth side portion 44 of W1.

  As a result, the portion defining the corner space between the flat surface 51 and the flat surface 51 is separated in a direction perpendicular to the light receiving direction Z with respect to a part near the corner of the outer peripheral surface of the photodetector 21. And a non-contact portion is formed with respect to the outer peripheral surface. In the portion of the base 12 that forms the corner of the recess 16, for example, when two planes are adjacent to each other at a right angle, if they are formed by punching, a curved surface that smoothly connects the two planes is formed. In many cases, it is formed inside the corner.

  If a curved portion is formed on the inner side of the corner and the base 12 is formed, if the corner of the right-angle photodetecting portion is arranged in accordance with the corner, the corner is ideally placed in the corner. Cannot be arranged, and the two planes of the base 12 are separated from the light detection unit. By forming the corner near the corner as a recess 16 that is large enough to be separated from the corner, the flat surface 51 of the light detection portion is prevented from being disposed away from the inner peripheral portion 17 of the base 12. can do. In the present embodiment, the base 12 can be formed by a technique such as cutting.

  For example, in another embodiment, by chamfering the corner of the light detection unit, the corner of the recess 16 of the base 12 is not formed into a shape that can be separated from the corner, and the light detection unit is 12 can be arranged at a desired position. Such an embodiment is also possible. However, if the shape of the base 12 is processed into the shape as described above at the corner of the base 12, it is possible to omit a chamfering operation step in the light detection unit, which is preferable.

  The optical component 11 is inserted into the base 12 in one of the predetermined directions, that is, in the light receiving direction one Z1. The base 12 has a displacement prevention part 52, and the displacement prevention part 52 prevents the optical component 11 from being displaced in the light receiving direction Z1. A displacement prevention surface 54 is formed in the displacement prevention portion 52. The displacement prevention surface 54 faces the other light receiving direction Z2, and the displacement prevention surface 54 contacts the optical component 11.

  A part of the other light receiving direction space 39 is defined by the displacement preventing portion 52 from the one light receiving direction Z1 side. In the present embodiment, a plurality of displacement prevention portions 52 are provided in the light receiving direction one Z1 of the base 12 rather than the light receiving direction other space 39. Four each of the displacement blocking portions 52 are provided facing the corner space in the other light receiving direction space 39. That is, each displacement prevention part 52 is formed continuously with two parts adjacent to each other across the corner among the first to fourth side parts 41 to 44. Each displacement prevention part 52 prescribes | regulates the depth of the light reception direction Z of the other space 39 of a light reception direction, and all the displacement prevention parts 52 are formed in the same depth. This depth defined by the displacement prevention portion 52 is referred to as “recess depth” (D1).

  A through-hole penetrating in the light receiving direction Z is formed in the remaining region excluding the displacement blocking portion 52 when the base 12 on the one light receiving direction Z1 side than the light receiving direction other side space 39 is seen in the light receiving direction Z. Of the area on the Z1 side of the light receiving direction from the recess 16, the remaining area excluding the displacement prevention portion 52 only needs to be deeper in the light receiving direction Z than the recess depth D1. Thus, by making it a through-hole, manufacture of the base 12 by cutting can be facilitated.

  The light detector 21 formed in a rectangular shape when viewed in the light receiving direction Z is inserted into the base 12 in a predetermined posture. That is, the part directed to one side Z1 in the light receiving direction is distinguished from the part directed to the other side Z2 in the light receiving direction, the part facing the first side part 41 is distinguished from the part facing the third side part 43, and the second The portion facing the side portion 42 is distinguished from the portion facing the fourth side portion 44.

  Therefore, the pressed portion to be pressed by the first protruding portion 46 and the pressed portion to be pressed by the second protruding portion 48 are respectively determined in advance on the outer peripheral portion 19. The portions of the outer peripheral portion 19 facing the third and fourth side portions 43 and 44 are each formed as a flat surface 51, and these flat surfaces 51 are adjacent to each other with a boundary line therebetween. In the present embodiment, these flat surfaces 51 are formed at right angles. The right angle corner is disposed away from the third and fourth side portions 43 and 44.

  FIG. 5 is a cross-sectional view of the base 12 and the photodetector 21 as viewed from the side according to an embodiment of the present invention. The outer peripheral portion 19 of the light detection portion facing the inner peripheral portion 17 of the base 12 is a portion in the light receiving direction Z1 of the light detection portion, and is formed of resin. Of the light detection part, the other part excluding the outer peripheral part 19 of the light receiving direction one Z1, for example, the part of the other light receiving direction Z2, including the outer surface, is not necessarily made of resin, For example, it may be formed of a transparent resin.

  The dimension D2 in the light receiving direction Z of the portion of the light detecting portion Z1 in the light receiving direction, the surface portion of which is made of resin, is set to a dimension equal to or greater than the recess depth D1. Therefore, the portion of the light detection portion in the light receiving direction Z1 whose surface portion is made of resin may coincide with the outer peripheral portion 19 and includes the outer peripheral portion 19 and further has a larger dimension in the light receiving direction Z. May be. In other words, a part of the other light receiving direction Z <b> 2 of the light detection unit is arranged to protrude from the recess 16 of the base 12 toward the other light receiving direction Z <b> 2.

  The output portion is formed including a substrate, and the outer peripheral portion 19 is made of a resin having a softening temperature lower than that of the material forming the substrate. The resin constituting the surface portion including the outer peripheral portion 19 is a material that softens at a predetermined annealing temperature. The softening temperature is set to any temperature between 70 ° C. and 100 ° C., for example, 80 ° C. On the other hand, the board | substrate contained in a photon detection part consists of epoxy resins, for example, The softening temperature is set higher than 100 degreeC.

  FIG. 6 is a flowchart showing an assembling method of the optical pickup device 10 according to the embodiment of the present invention. This process is started in a state where the manufacture of the photodetector 21, the base 12, and other optical components is completed. After the start of this process, the process proceeds to step a1, and the photodetector 21 is fixed to the base 12. In step a1, the photodetector 21 is placed and fixed by press-fitting the photodetector 21 into the base 12.

  Next, the process proceeds to step a2, and the photodetector 21 and the base 12 are annealed at a temperature equal to or higher than the softening temperature of the resin forming the outer peripheral portion 19 and lower than the softening temperature of the resin forming the substrate. Thereby, the resin constituting the outer peripheral portion 19 bites into the protruding portion 18, and the light detecting portion can be stably fixed to the base 12 without using an adhesive.

  Step a3 is performed in parallel with at least one of steps a1 and a2. In step a3, other optical components are fixed to the housing 22. After steps a2 and a3, the process proceeds to step a4, and the base 12 on which the photodetector 21 is attached is fixed to the housing 22 on which other optical components are attached. This is done, for example, by a screw member. Thereafter, this process is terminated.

  According to the present embodiment, the plurality of protrusions 18 are provided on the inner peripheral portion 17 of the base 12 and protrude in a plurality of different directions. The plurality of directions go inward of the recess 16. The optical component 11 is disposed in the recess 16 by being inserted in a predetermined direction. The optical component 11 has an outer peripheral portion 19, and the outer peripheral portion 19 faces the inner peripheral portion 17 of the base 12. The outer peripheral portion 19 is formed in a shape different from a circle when viewed in the predetermined direction. The outer peripheral portion 19 is pressed by the plurality of protrusions 18.

  As a result, the outer peripheral portion 19 of the optical component 11 is pressed by the plurality of projecting portions 18, so that the optical component 11 can be fixed to the base 12. The optical component 11 is formed in a non-circular shape, and the plurality of protrusions 18 press the optical component 11 in a plurality of different directions, so that the optical component 11 can be positioned. Moreover, since the optical component 11 can be arrange | positioned by press injection, arrangement | positioning, positioning, and fixing of the optical component 11 with respect to the base 12 can be performed easily.

  Moreover, since the optical component 11 is pressed by the some protrusion part 18, a part of inner peripheral part 17 of the base 12 and a part of outer peripheral part 19 of the optical component 11 can be spaced apart. Therefore, compared with the case where the entire outer peripheral portion 19 of the optical component 11 is in contact with the entire inner peripheral portion 17 of the base 12, the press-fitting of the optical component 11 into the base 12 can be facilitated. Moreover, since it is not necessary to form the site | part for positioning the optical component 11 with respect to the base 12 in the optical component 11, manufacture of the optical component 11 can be made easy.

  Further, according to the present embodiment, the outer peripheral portion 19 has a plurality of pressed portions 49, and the plurality of pressed portions 49 are pressed by the plurality of protruding portions 18. A flat flat surface 51 is formed on each portion of the outer peripheral portion 19 on the side opposite to each pressed portion 49. The flat flat surface 51 is perpendicular to the direction in which each pressed portion 49 is pressed against each protrusion 18. As a result, the optical component 11 can be arranged in a state where the plurality of flat surfaces 51 are in contact with the base 12. Therefore, the optical component 11 can be reliably positioned with respect to the base 12.

  According to the present embodiment, at least two of the plurality of flat surfaces 51 are adjacent to each other via the boundary line. The inner peripheral portion 17 is separated from the corner portion of the outer peripheral portion 19 in the vicinity of the boundary line. Thereby, the optical component 11 can be arranged at a desired position. If two planar surfaces are formed adjacent to each other on the inner peripheral portion 17 corresponding to the two flat surfaces 51 of the optical component 11, at the corners near the boundary between the two planar surfaces, Two adjacent surfaces cannot be ideally formed, and a smoothly continuous curved surface is formed on these two surfaces. On the other hand, in the vicinity of the corner portion formed by the two flat surfaces 51, the inner peripheral portion 17 is formed away from the corner portion, so that even if a curved surface is formed on the inner peripheral portion 17, the optical component It is possible to prevent the eleven corners from being displaced from the ideal position.

  According to the present embodiment, the optical component 11 is inserted into the base 12 in one of the predetermined directions, that is, toward the light receiving direction Z1. The base 12 has a displacement prevention part 52, and the displacement prevention part 52 prevents the optical component 11 from being displaced in the light receiving direction Z1. A displacement prevention surface 54 is formed in the displacement prevention portion 52. The displacement prevention surface 54 faces the other light receiving direction Z2, and the displacement prevention surface 54 contacts the optical component 11. Thus, the optical component 11 can be positioned by surface contact in the predetermined light receiving direction Z in which the optical component 11 is inserted.

  According to the present embodiment, the optical component 11 further includes the light receiving unit 36 and the output unit, and the light receiving unit 36 receives incident light. The output unit is formed to include a substrate, and outputs a detection signal corresponding to the amount of received light incident on the light receiving unit 36. The outer peripheral portion 19 is made of a resin having a softening temperature lower than that of the material forming the substrate. Thus, annealing can be performed at a temperature not lower than the softening temperature of the resin forming the outer peripheral portion 19 and lower than the softening temperature of the material forming the substrate included in the optical component 11.

  Therefore, the protruding portion 18 formed on the base 12 can be bitten into the outer peripheral portion 19 of the optical component 11, and the contact area between the protruding portion 18 and the outer peripheral portion 19 can be increased. Thus, the optical component 11 can be firmly fixed to the base 12 without bonding the optical component 11 and the base 12 with an adhesive. Therefore, it is possible to omit work steps related to application, positioning, and solidification of the adhesive, and to improve the efficiency of the assembly work of the optical pickup device 10.

  In the above embodiment, the optical component 11 is the photodetector 21, but the optical component 11 is not limited to the photodetector 21. In the optical pickup device 10, the optical component 11 may be another optical component that is fixedly attached to the housing 22.

DESCRIPTION OF SYMBOLS 10 Optical pick-up apparatus 11 Optical component 12 Base 13 Optical recording medium 16 Recess 17 Inner peripheral part 18 Protrusion part 19 Outer peripheral part 21 Photo detector 22 Housing 36 Light receiving part 49 Pressed part 51 Flat surface 52 Displacement prevention part

Claims (5)

A base on which a recess is formed, the base including a plurality of protrusions provided in an inner peripheral portion defining the recess and protruding in a plurality of different directions toward the inside of the recess When,
An optical component that is inserted and arranged in a predetermined direction in the recess,
Having an outer periphery facing the inner periphery,
The outer peripheral portion is formed in a shape different from a circle when viewed in the predetermined direction,
The optical pickup apparatus, wherein the outer peripheral portion includes an optical component pressed by the plurality of protrusions. The outer peripheral portion has a plurality of pressed portions that are pressed by the plurality of protrusions,
A flat flat surface perpendicular to the direction in which each pressed portion is pressed against each projection is formed on each portion of the outer peripheral portion opposite to the pressed portion. The optical pickup device according to claim 1. At least two of the plurality of flat surfaces are adjacent to each other via a boundary line;
The optical pickup device according to claim 2, wherein the inner peripheral portion is separated from a corner portion of the outer peripheral portion in the vicinity of the boundary line. The optical component is inserted toward the base in one of the predetermined directions,
The base has a displacement prevention part for preventing displacement of the optical component to the one side,
The optical pickup according to any one of claims 1 to 3, wherein the displacement prevention unit is formed with a displacement prevention surface that faces the other of the predetermined directions and contacts the optical component. apparatus. The optical component is
A light receiving portion for receiving incident light;
An output unit that includes a substrate and that performs output in accordance with the amount of light incident on the light receiving unit;
The optical pickup device according to claim 1, wherein the outer peripheral portion is made of a resin having a softening temperature lower than that of the material forming the substrate.

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