JP2015026400A - Fitting structure of optical element, and optical pickup device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fitting structure of an optical element by which the optical element can be easily and properly attached to an installation member, and to provide an optical pickup device using the fitting structure.SOLUTION: A housing H is provided with two inclined surfaces H11, H21 and wall surfaces H13, H23, H42, H43 which are perpendicular to an X-axis. A PBS 103 is embedded into a hollow H1 from an upper side, and a leaf spring P is inserted between a transmission surface 103b and the wall surface H42 of the PBS 103. This allows two under surfaces 103e, 103f of the PBS 103 to be supported by the inclined surfaces H11, H21 in a Y-axis positive direction, an incidence surface 103a of the PBS 103 to be supported by the wall surfaces H13, H23, H43 in an X-axis negative direction, and the transmission surface 103b of the PBS 103 to be pressed by a leaf spring P to an X-axis positive direction.

Description

  The present invention relates to an optical element mounting structure and an optical pickup device using the same.

  Conventionally, various optical elements such as a half mirror and a polarization beam splitter are installed in an optical pickup device. These optical elements need to be accurately attached to the housing of the optical pickup device. In this case, the optical element is installed such that the bottom surface is placed on the housing. For example, when a rectangular half mirror is installed in a housing, a method of adhering and fixing the half mirror to the housing while pressing one side surface of the half mirror against the installation surface of the housing is used (for example, Patent Document 1).

JP 2006-40399 A

  However, according to the above method, when fixing the half mirror, it is necessary to perform a complicated operation of performing adhesion while pressing the half mirror against the installation surface.

  The present invention has been made to solve such a problem, and provides an optical element mounting structure capable of simply and appropriately mounting an optical element to an installation member, and an optical pickup device using the same. Objective.

  A first aspect of the present invention relates to an attachment structure for attaching an optical element to an installation member. The mounting structure according to this aspect includes an elastic member interposed between the optical element and the installation member. The installation member includes two slopes that are inclined by a predetermined angle so that the outside is displaced in the same direction with respect to one horizontal plane, a first wall surface that is formed behind the slope and is perpendicular to the slope, A second wall surface formed in front of the slope and facing the first wall surface. The optical element includes two lower surfaces that are respectively placed on the two inclined surfaces. The elastic member is inserted between the second wall surface and the front surface of the optical element in a state where the two lower surfaces are placed on the two inclined surfaces, and the optical element is elastically generated by the elastic member. Is pressed against the first wall surface.

  According to this aspect, the optical element is positioned in the in-plane direction perpendicular to the front-rear direction only by placing the lower surface of the optical element on the slope. Further, the optical element is positioned in the front-rear direction by inserting an elastic member between the second wall surface and the front surface of the optical element. Therefore, the optical element can be easily and properly attached to the installation member.

  In this aspect, the elastic member may be a plate-like spring bent so that two plate-like portions face each other at a predetermined interval. In this case, the interval between the two plate-like portions is reduced from a predetermined interval, and the two plate-like portions are inserted between the second wall surface and the front surface of the optical element.

In this configuration, one plate-like portion of the spring has a curved convex surface that comes into contact with the front surface of the optical element when the two plate-like portions are interposed between the second wall surface and the front surface of the optical element. It is desirable to be done. In this way, the spring can be smoothly pushed between the second wall surface and the front surface of the optical element.

  In addition, an engaging portion extending in a direction away from the one plate-like portion is extended on the upper portion of the other plate-like portion of the spring, and an abutting surface that comes into contact with this engaging portion is on the upper side of the second wall portion. Preferably, the spring is attached to the installation member by pushing the two plate-like portions between the second wall surface and the front surface of the optical element until the locking portion comes into contact with the contact surface. If it carries out like this, a spring can be attached to an installation member only by pushing in between two plate-shaped parts between a 2nd wall surface and the front surface of an optical element.

  Further, on both sides in the width direction of the slope, gap generating portions are formed for securing a gap between both ends in the width direction of the lower surface when the lower surface of the optical element is placed on the slope. Is desirable. This prevents the burr from coming into contact with the installation member and tilting the optical element even when a burr is attached to the lower surface of the optical element when the optical element is cut out. Therefore, the positioning accuracy of the optical element can be increased.

  In this case, when the two slopes are formed so as to face each other, the installation member has a clearance surface on the first wall surface side of the slope that is one step lower than the slope and parallel to the slope. Can be formed as And when a 1st wall surface is provided with three wall surface parts arrange | positioned on the same plane, two of these three wall surface parts are extended in the upward direction from the said escape surface. If it carries out like this, when forming an installation member with a metal mold | die, it can suppress that a wall surface part becomes difficult to pull out from a metal mold | die, and when a metal mold | die is pulled out from an installation member, it suppresses that a crack etc. arise in a wall surface part. Can do.

  The elastic member is provided between the second wall surface and the front surface of the optical element so that an elastic force is applied to the center of gravity of the triangle whose apex is the contact position between the three wall surface portions and the back surface of the optical element. It is desirable to be inserted in. If it carries out like this, the back surface of an optical element can be equally pressed on three wall surface parts.

  Further, it is desirable that the installation member is formed with an escape portion that prevents the corner portion of the boundary between the two lower surfaces from coming into contact with the installation member when the lower surface of the optical element is placed on the slope. In this case, when the lower surface of the optical element is placed on the slope, the corner portion abuts on the installation member, and the optical element can be prevented from being inclined, and the positional accuracy of the optical element can be improved.

  A second aspect of the present invention relates to an optical pickup device. An optical pickup device according to the present aspect includes an optical element mounting structure according to the first aspect, an optical system for irradiating a disk with laser light emitted from a laser light source, and the optical system installed therein. And a housing as an installation member. And at least 1 optical element which comprises an optical system is attached to a housing by the said attachment structure.

  According to this aspect, the same effect as the first aspect can be achieved.

  As described above, according to the present invention, it is possible to provide an optical element mounting structure capable of simply and appropriately mounting an optical element on an installation member, and an optical pickup device using the same.

  The features of the present invention will be further clarified by the embodiments described below. However, the following embodiment is merely one embodiment of the present invention, and the meaning of the term of the present invention or each constituent element is not limited at all by the following embodiment.

It is a figure which shows the optical system of the optical pick-up apparatus which concerns on embodiment. It is a figure which shows the structure of the optical pick-up apparatus which concerns on embodiment. It is a figure which shows the structure of the optical pick-up apparatus which concerns on embodiment. It is a figure which shows the housing in the vicinity of the installation position of PBS which concerns on embodiment, the figure which shows PBS, and the figure which shows a leaf | plate spring. It is a figure explaining that PBS which concerns on embodiment is attached to a housing. The figure which shows the state where PBS which concerns on embodiment was attached to the housing, the figure which shows the position where PBS is supported, the figure which shows the state in which the lower surface of PBS is contacting the slope, and the wall surface of a hollow is formed easily It is a figure explaining what can be done. It is a figure explaining the attachment structure of PBS which concerns on the example of a change of embodiment.

  In this embodiment, the present invention is applied to an optical pickup device that irradiates a BD (Blu-ray Disc), a CD (Compact Disc), and a DVD (Digital Versatile Disc) with laser light.

  1A and 1B show an optical system of an optical pickup device 1 according to an embodiment. 1A is a top view of the optical system, FIG. 1B is an internal perspective view of the peripheral portion of the objective lens actuator viewed from the side, and FIG. 1C shows the arrangement of laser elements in the semiconductor laser 101. FIG.

  Referring to FIG. 1A, an optical pickup device 1 includes a semiconductor laser 101, a diffraction grating 102, a flat polarizing beam splitter (PBS) 103, a λ / 4 plate 104, a collimator lens 105, A lens actuator 106, a rising mirror 107, an objective lens 108, a diffractive optical element 109, and a photodetector 110 are provided.

  The semiconductor laser 101 includes a laser beam with a wavelength of about 400 nm (hereinafter referred to as “BD light”), a laser beam with a wavelength of about 650 nm (hereinafter referred to as “DVD light”), and a laser beam with a wavelength of about 780 nm (hereinafter referred to as “CD light”). Light)) in the same direction.

  As shown in FIG. 1B, the semiconductor laser 101 includes laser elements 101a, 101b, and 101c that emit BD light, DVD light, and CD light, respectively, in one CAN. The laser elements 101b and 101c are integrally formed so that the interval between the light emitting points is w2, and the laser element 101a has an interval between the light emitting point and the light emitting point of the laser element 101b as w1 (w1> w2). It is formed as follows. The laser elements 101a, 101b, and 101c are formed so that the light emitting points are aligned on a straight line. The optical system after the semiconductor laser 101 is adjusted so that its optical axis matches the optical axis of the DVD light.

  The diffraction grating 102 splits only the BD light out of the BD light, DVD light, and CD light emitted from the semiconductor laser 101 into a main beam and two sub beams. DVD light and CD light are also diffracted by the diffraction grating 102, but the intensity of sub-beams of these lights is extremely small.

  The PBS 103 reflects the laser light incident from the diffraction grating 102 side. The PBS 103 is a thin plate-like parallel flat plate, and a polarizing film is formed on the incident surface thereof. The semiconductor laser 101 is arranged so that the polarization directions of the BD light, DVD light, and CD light are S-polarized with respect to the PBS 103.

  The λ / 4 plate 104 converts the laser light reflected by the PBS 103 into circularly polarized light, and converts the reflected light from the disk into linearly polarized light that is orthogonal to the polarization direction toward the disk. As a result, the laser light reflected by the disk passes through the PBS 103 and is guided to the photodetector 110.

  The collimator lens 105 converts the laser light reflected by the PBS 103 into parallel light. The lens actuator 106 drives the λ / 4 plate 104 and the collimator lens 105 in the optical axis direction of the collimator lens 105.

  The lens actuator 106 includes a moving member 106a, a shaft 106b, a gear 106c, and a motor 106d. The moving member 106 a holds the λ / 4 plate 104 and the collimator lens 105. The moving member 106 a is supported by the shaft 106 b so as to be movable in the optical axis direction of the collimator lens 105. Further, a gear (not shown) is disposed on the moving member 106a, and this gear meshes with the gear 106c. The gear 106c is connected to the drive shaft of the motor 106d. When the motor 106 d is driven, the collimator lens 105 held by the moving member 106 a moves together with the λ / 4 plate 104. Thus, the aberration generated in the laser light is corrected by moving the collimator lens 105 according to the control signal.

  The rising mirror 107 reflects the laser beam incident through the collimator lens 105 in a direction toward the objective lens 108. The objective lens 108 is held by a holder 121, and the holder 121 is driven in a focus direction and a tracking direction by an objective lens actuator 122. By driving the holder 121 in this way, the objective lens 108 is driven in the focus direction and the tracking direction.

  The reflected light from the disk is converted by the λ / 4 plate 104 into linearly polarized light that becomes P-polarized light with respect to the PBS 103. As a result, the reflected light from the disk passes through the PBS 103. The PBS 103 is disposed so as to be inclined by 45 degrees with respect to the optical axes of the BD light, DVD light, and CD light. For this reason, when BD light, DVD light, and CD light are transmitted through the PBS 103 in a converged state, astigmatism is introduced into these lights.

  The diffractive optical element 109 diffracts BD light, DVD light, and CD light. The diffractive optical element 109 is designed so that the + 1st order diffraction efficiency is high for BD light and the 0th order diffraction efficiency is high for DVD light and CD light. The + 1st order diffracted light of the BD light is bent in a direction approaching the optical axis of the DVD light by the diffractive optical element 109 and is irradiated on the light receiving surface of the photodetector 110 at the irradiation position of the DVD light.

  The photodetector 110 is provided with a four-divided sensor at a position where zero-order diffracted light of DVD light and CD light is irradiated. The main beam of BD light (+ 1st order diffracted light) is diffracted by the diffractive optical element 109 as described above, and is irradiated to the quadrant sensor that receives DVD light. Further, the photodetector 110 is provided with a four-divided sensor at a position where two sub beams (+ 1st order diffracted light) of BD light are irradiated. The sensor layout of the photodetector 110 is set so that a reproduction RF signal, a focus error signal, and a tracking error signal are generated by the output from each sensor.

  FIG. 2 is a perspective view of the optical pickup device 1 as viewed from above. FIG. 2 shows the objective lens 108, the holder 121, and the objective lens actuator 122 among the configurations shown in FIGS. 1 (a) and 1 (b). Other optical systems are mounted on the back surface of the housing H. Further, FIG. 2 shows an opening H41 and a leaf spring P described later. The housing H is made of PPS (polyphenylene sulfide).

  FIG. 3 is a perspective view of the optical pickup device 1 as viewed from the back side. FIG. 3 shows a semiconductor laser 101, a diffraction grating 102, a PBS 103, a λ / 4 plate 104, a moving member 106a, a shaft 106b, a gear 106c, a motor 106d, A raising mirror 107 is shown. As shown in FIG. 3, a receiving portion for installing each member of the optical system is formed on the rear surface of the housing H. Each member of the optical system is installed in a corresponding receiving portion directly or in a state of being accommodated in a holder.

  FIG. 4A is a diagram illustrating the housing H in the vicinity of the installation position of the PBS 103. FIG. 4A shows the same coordinates as those shown in FIG. FIG. 4A also shows the x axis and the y axis that form an angle of 45 degrees with respect to the X axis and the Z axis in the XZ plane (horizontal plane). The x axis and the y axis are perpendicular to each other.

  In the vicinity of the installation position of the PBS 103 in the housing H, a recess H1 is formed. In the depression H1, slopes H11 and H12 and wall surfaces H13 are formed on the y-axis positive direction (left rear) side, and slopes H21, H22 and wall surface H23 are formed on the y-axis negative direction (right front) side. Yes. Further, in the recess H1, a plane H31 is formed on the x-axis negative direction (left front) side, and an opening H41 and wall surfaces H42 and H43 are formed on the center X-axis positive direction (downward) side. . In addition, the hollow for a laser beam to pass is formed in the back of the hollow H1, the right direction, and the left direction, and the hollow H1 is connected with these hollows.

  The inclined surfaces H11 and H21 are inclined so that the opening H41 side is lowered from a state parallel to the XZ plane (horizontal plane). On both sides of the slope H11, slopes H12 that are one step lower than the slope H11 and parallel to the slope H11 are formed. Similarly, slopes H22 that are one step lower than the slope H21 and parallel to the slope H21 are formed on both sides of the slope H21. Furthermore, wall surfaces H13 and H23 perpendicular to the x-axis direction are extended upward from the inclined surfaces H12 and H22 on the positive side of the x-axis (Y-axis positive direction). The inclined surfaces H12 and H22 are connected to the opening H41, and the inclined surfaces H12 and H22 on the positive side of the x-axis are connected to the wall surface H43 perpendicular to the x-axis direction. The wall surface H43 is one inner surface of the opening H41. The opening H41 has a substantially rectangular outline in a top view, and the long side and the short side of the rectangle are parallel to the x-axis direction and the y-axis direction, respectively. The opening H41 extends further to the x-axis negative side than the x-axis negative side edge of the slopes H12 and H22 on the x-axis negative side. The surface on the negative side of the x-axis of the opening H41 is perpendicular to the x-axis and is connected to the wall surface H42 that is also perpendicular to the x-axis in the same plane. The upper end of the wall surface H42 is connected to the plane H31. The boundary portion between the wall surface H42 and the plane H31 is chamfered.

  The depression H1 is configured to have a symmetrical shape with respect to a plane that passes through the center of the opening H41 and is perpendicular to the y-axis direction. The slopes H11, H12, H21, and H22 are surfaces that form an angle of 45 degrees with the XZ plane (horizontal plane), and the slopes H11 and H21 are on the Y axis positive direction (upward) side of the slopes H12 and H22, respectively. It protrudes. The plane H31 is a plane parallel to the horizontal plane, and the opening H41 is a hole that penetrates the housing H in the vertical direction. Wall surfaces H13, H23, H42, and H43 are surfaces perpendicular to the x-axis. The wall surfaces H13, H23, and H43 are positioned on the same plane. Further, the surface accuracy of the wall surfaces H13, H23, and H43 is enhanced by applying mirror finish to the regions corresponding to the wall surfaces H13, H23, and H43 of the mold forming the housing H. The PBS 103 is fitted into the depression H1 from the upper side to the lower side in FIG.

  FIG. 4B is a diagram showing the PBS 103. In FIG. 4 (b), coordinates similar to the coordinates shown in FIG. 4 (a) are also shown.

  The PBS 103 has a rectangular parallelepiped shape, and has an incident surface 103a, a transmission surface 103b, upper surfaces 103c and 103d, and lower surfaces 103e and 103f on the surface. The incident surface 103a and the transmission surface 103b have a square shape. In FIG. 4B, the PBS 103 has an upper surface 103c and a lower surface 103f that are parallel to a horizontal plane (XZ plane), and the incident surface 103a and the transmission surface 103b are perpendicular to the x axis. As shown in FIG.

  In this state, the PBS 103 tilted as shown in FIG. 4B is fitted into the recess H1 in FIG. 4A from above. At this time, the lower surface 103e is in contact with the inclined surface H11, the lower surface 103f is in contact with the inclined surface H21, and the corner 103g at the boundary between the lower surfaces 103e and 103f is positioned in the opening H41 so as not to contact the housing H. Further, the PBS 103 is fitted into the recess H1 so that the incident surface 103a contacts the wall surfaces H13, H23, and H43.

  The inclined surfaces H11 and H21 are surfaces that form an angle of 45 degrees with the XZ plane (horizontal plane), and the angle formed by the inclined surfaces H11 and H21 is 90 degrees. Further, since the PBS 103 is a rectangular parallelepiped, the angle formed by the lower surfaces 103e and 103f is 90 degrees. Therefore, when the PBS 103 is inserted into the recess H1, if the lower surfaces 103e and 103f of the PBS 103 are placed on the inclined surfaces H11 and H21, both the lower surfaces 103e and 103f are brought into contact with the corresponding inclined surfaces H11 and H21 by the weight of the PBS 103, respectively. It moves to the position where it contacts, and the PBS 103 is positioned at that position. Further, even if the PBS 103 is moved in the x-axis direction in this state, the position of the PBS 103 in the in-plane direction of the plane perpendicular to the x-axis is maintained.

  FIG. 5A is a view showing a state in which the PBS 103 shown in FIG. 4B is fitted in the recess H1 shown in FIG. 4A and the incident surface 103a is in contact with the wall surfaces H13, H23, and H43. is there. At this time, a gap is formed between the transmission surface 103b and the wall surface H42, and a later-described leaf spring P is inserted into the gap.

  FIG. 4C shows the leaf spring P. In FIG. 4C, coordinate axes similar to the Y-axis, x-axis, and y-axis shown in FIG. 4A are also shown.

  The leaf spring P is made of a metal material and has an intermediate part P10, a bent part P20, a flange part P30, and a flat part P40. The bent part P20 is connected to the lower end of the intermediate part P10. A support surface P21 made of a curved projection is formed at the upper end of the bent portion P20. The collar part P30 is connected to the upper end of the intermediate part P10 via the plane part P40. The lower surface of the plane part P40 is parallel to the horizontal plane.

The flat surface portion P40 is connected so as to be bent approximately 90 degrees in a curved shape from the end in the Y axis positive direction of the intermediate portion P10, and further, approximately 90 in a curved shape from the end in the x axis negative direction of the intermediate portion P10. The buttocks P30 are connected so as to be bent each time. Further, the bent portion P20 is connected so as to be bent at an acute angle in a curved shape from the end portion in the Y-axis negative direction of the intermediate portion P10. The bent part P20 is bent in a direction away from the intermediate part P10 at a slightly higher position (first bent position) from the bottom. The bent portion P20 has a width that gradually decreases in the y-axis direction as it goes in the positive direction of the Y-axis, but a portion having substantially the same width in the y-axis direction is provided at the tip. At a position close to the tip of the portion having the same width (second bending position), the bent portion P20 is bent again in a curved shape in a direction approaching the intermediate portion P10, and the tip of the bent portion P20 is turned to the intermediate portion P10. It is close to a parallel state. A support surface P21 is provided at a portion where the width of the tip of the bent portion P20 is the same. When the leaf spring P is viewed in the negative x-axis direction, the support surface P21 has a contour obtained by rounding all apex angles of an isosceles triangle whose base is parallel to the y-axis direction. The support surface P21 becomes narrower as the width in the y-axis direction goes in the Y-axis direction. The support surface P21 is disposed such that the upper portion thereof is engaged with the second bending position. The support surface P21 is curved so that the center portion thereof is higher, and the highest portion of the support surface P21 is slightly below the second folding position (Y-axis negative side). Further, the corner of the bent portion P20 in the y-axis direction at the tip is chamfered into a curved surface.

  FIG. 5B is a diagram illustrating a state in which the leaf spring P is inserted between the transmission surface 103b and the wall surface H42 in the state illustrated in FIG. At this time, the intermediate portion P10 is in contact with the wall surface H42, the support surface P21 of the bent portion P20 is in contact with the transmission surface 103b of the PBS 103, and the lower surface of the flat surface portion P40 is in contact with the flat surface H31 of the housing H. ing. The width of the leaf spring P in the y-axis direction is substantially the same as the width of the plane H31 and the wall surface H42 in the y-axis direction.

  Fig.6 (a) is a side view which shows the state of FIG.5 (b). In FIG. 6A, coordinate axes similar to the Y-axis, x-axis, and y-axis shown in FIG. 5B are also shown.

  When the leaf spring P is inserted between the transmission surface 103b and the wall surface H42, the intermediate portion P10 contacts the wall surface H42, and the support surface P21 of the bent portion P20 contacts the transmission surface 103b. At this time, the bent portion P20 is bent in the direction indicated by the dashed arrow. In a state where the bent portion P20 is bent, the leaf spring P is inserted downward (Y-axis negative direction) until the lower surface of the flat portion P40 contacts the flat surface H31. At this time, the PBS 103 is urged in the positive x-axis direction by the leaf spring P by the restoring force of the leaf spring P. Against this bias, the incident surface 103a is supported in the negative x-axis direction by the wall surfaces H13, H23, and H43, and the transmissive surface 103b is pressed in the positive x-axis direction by the support surface P21. When the insertion of the leaf spring P is completed, as shown in FIG. 5B, an adhesive is applied to the boundary between the upper surface 103c and the inclined surface H11 and the boundary between the upper surface 103d and the inclined surface H21. Thus, the attachment of the PBS 103 to the housing H is completed.

  FIG. 6B is a diagram when the state of FIG. 6A is viewed in the negative x-axis direction.

  When the PBS 103 is fixed, the wall surfaces H13, H23, and H43 support the positions p1 to p3 on the incident surface 103a, respectively, and the support surface P21 is in contact with the position p4 on the transmission surface 103b.

  At this time, as shown in FIG. 5B, the width in the y-axis direction of the leaf spring P is substantially the same as the width of the plane H31 and the wall surface H42, and as shown in FIG. A leaf spring P is inserted so that the lower surface of the plate abuts against the plane H31. As a result, the position p4 where the support surface P21 of the leaf spring P abuts the transmission surface 103b is substantially the same position on the transmission surface 103b. In the present embodiment, the position p4 is positioned at the center of gravity of a triangle having apexes at the positions p1, p2, and p3, as shown in FIG. 6B. By setting the position p4 in this way, the PBS 103 is evenly pressed against the wall surfaces H13, H23, and H43. Further, the laser light incident on the PBS 103 from the diffraction grating 102 side and the λ / 4 plate 104 side is irradiated on the position of the broken circle on the incident surface 103a. Therefore, even if the position p4 is set in this way, the leaf spring P is not applied to the laser beam.

  FIG. 6C is a diagram illustrating a state in which the lower surface 103e of the PBS 103 is in contact with the inclined surface H11.

  The thickness of the PBS 103 (the width in the thickness direction of the lower surface 103e) is smaller than the width from the left end of the left slope H12 to the right end of the right slope H12. As a result, when the PBS 103 is fitted into the recess H1, even if the thickness of the PBS 103 varies, the PBS 103 can be properly placed on the slope H11.

Further, the lower surface 103e may have a burr as shown in FIG. 6C when the PBS 103 is cut out. The slopes H11 and H12 are formed so that the height difference w3 between the slope H11 and the slope H12 is larger than the assumed burr height. Accordingly, when the PBS 103 is fitted into the recess H1, the burr does not hit the slope H12, and the lower surface 103e can be reliably placed on the slope H11. Therefore, the PBS 103 is prevented from being tilted by the burr, and the PBS 103 can be installed with high accuracy. The slopes H21 and H22 are the same as the slopes H11 and H12.

<Effect of Embodiment>
According to the present embodiment, the following effects can be achieved.

  After the PBS 103 is fitted in the recess H1 as shown in FIG. 5A, the plate spring P is inserted as shown in FIGS. 5B and 6A, so that the PBS 103 is attached to the housing H. Therefore, a complicated operation of applying an adhesive while pressing the PBS 103 against the surface is not necessary, and the PBS 103 can be easily attached to the housing H.

  By simply placing the lower surfaces 103e and 103f of the PBS 103 on the inclined surfaces H11 and H21, the PBS 103 is positioned in the in-plane direction perpendicular to the x-axis direction, and the leaf spring P is pushed between the transmission surface 103b and the wall surface H42. As a result, the PBS 103 is positioned in the x-axis direction. Therefore, the PBS 103 can be easily and properly attached to the recess H1 on the installation member.

  As shown in FIG. 4C, since the curved support surface P21 that contacts the incident surface 103a is formed in the bent portion P20 of the leaf spring P, a plate is formed between the wall surface H42 and the transmission surface 103b. The spring P can be pushed in smoothly.

  As shown in FIG. 4C, since the flat portion P40 that abuts against the plane H31 of the housing H is formed on the leaf spring P, the leaf spring P is connected to the wall surface H42 until the plane portion P40 abuts against the plane H31. The leaf spring P can be attached to the housing H simply by pushing between the transmitting surface 103b.

  As shown in FIG. 6C, the slopes H11 and H12 are formed so that the width from the left end of the left slope H12 to the right end of the right slope H12 is larger than the thickness of the PBS 103. Even if there is variation, the PBS 103 can be properly placed on the slope H11. Further, as shown in FIG. 6C, a slope H12 that is one step lower than the slope H11 is formed, and the height difference w3 between the slope H11 and the slope H12 is larger than the expected burr height. Even when the burrs are attached to the PBS 103, the burrs abut against the housing H to prevent the PBS 103 from tilting. Therefore, the positioning accuracy of the PBS 103 can be increased.

  As shown in FIG. 4A, since the opening H41 is formed in the recess H1 and the corner 103g of the boundary between the lower surfaces 103e and 103f does not hit the housing H by the opening H41, the lower surfaces 103e and 103f of the PBS 103 are inclined to the inclined surfaces H11, When mounting on H21, it can be avoided that the corner 103g of the PBS 103 contacts the housing H and the PBS 103 is inclined. Therefore, the PBS 103 can be accurately attached to the housing H.

  As shown in FIG. 4A, the wall surfaces H13 and H23 are formed so as to extend upward from the inclined surfaces H12 and H22. Therefore, when the housing H is formed by a mold, the wall surfaces H13 and H23 are molds. It will not get caught in.

FIG.6 (d) is a figure which shows the formation state of wall surface H51-H53 in a comparative example. In the comparative example, the bottom surface of the PBS 130 is placed on the installation surface on the housing H. In this case, if the back surface of the PBS 130 is to be supported at three locations, lower surfaces H51a and H52a are formed on the wall surfaces H51 and H52 as shown in FIG. 6 (d). For this reason, when the mold is pulled upward from the housing H, the lower surfaces H51a and H52a may be caught by the mold and the wall surfaces H51 and H52 may be damaged.

  On the other hand, according to the present embodiment, as shown in FIG. 6 (e), since the wall surfaces H13 and H23 are continuously formed from the slopes H12 and H22, the bottom surfaces are not generated on the wall surfaces H13 and H23. For this reason, the mold can be smoothly pulled out from the housing H in the upward direction. Accordingly, the wall surfaces H13 and H23 can be appropriately formed without causing defects or the like on the wall surfaces H13 and H23.

  As shown in FIG. 6B, the leaf spring P is provided with an elastic force at the center of gravity of the triangle whose apex is the contact position between the three wall surfaces H13, H23, H43 and the incident surface 103a of the PBS 103. In addition, since it is inserted between the wall surface H42 and the transmission surface 103b, the transmission surface 103b of the PBS 103 can be pressed evenly against the three wall surfaces H13, H23, and H43.

  In the present embodiment, since the PBS 103 is fixed to the housing H with a certain degree of strength by the leaf spring P, an adhesive is used to reinforce the fixing of the PBS 103. Therefore, in the present embodiment, the adhesive can be omitted as appropriate, and even when the adhesive is used, the displacement of the PBS 103 due to the deterioration of the adhesive is suppressed.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications other than those described above can be made to the embodiments of the present invention.

  For example, in the above-described embodiment, an example in which the present invention is applied to the mounting structure of the PBS 103 has been shown. However, the present invention is not limited to the PBS 103, and other optical elements (half mirror, diffraction grating 102) in the optical pickup device. The diffractive optical element 109 and the like can also be applied as appropriate.

  Moreover, in the said embodiment, although the entrance surface 103a and transmission surface 103b of PBS103 were made into square shape, not only this but another shape may be sufficient. For example, the entrance surface 103a and the transmission surface 103b of the PBS 103 may be rectangular, or may be a pentagon as shown in FIG. 7A or a shape partially including an arc as shown in FIG. 7B. There may be.

  In the above embodiment, since the PBS 103 has a rectangular shape, the angle formed by the lower surfaces 103e and 103f is 90 degrees. However, the angle is not limited to this, and the angle formed by the lower surfaces 103e and 103f is other than 90 degrees. May be. In this case, it is desirable that the angle formed by the slopes H11 and H21 is set in accordance with the angle formed by the lower surfaces 103e and 103f. For example, the angle θ formed by the lower surfaces 103e and 103f and the angle θ formed by the inclined surfaces H11 and H21 may exceed 90 degrees as shown in FIG. 7C, or less than 90 degrees as shown in FIG. It may be.

  In the above embodiment, the slopes H11 and H21 are formed in a V shape with the outer side displaced upward, that is, so as to face each other, but in an inverted V shape with the outer side displaced downward, The slopes H11 and H21 may be formed so as not to face each other. In this case, the lower surface of the PBS 103 also needs to be formed to be an inverted V-shaped slope so as to be placed on the slopes H11 and H21. The inclined surfaces H11 and H21 may have any shape as long as the PBS 103 is positioned in the in-plane direction of the PBS 103 by placing the PBS 103 thereon.

In the above embodiment, the incident surface 103a of the PBS 103 has three wall surfaces H13 and H13.
However, the present invention is not limited to this and may be supported by one wall surface.

  Further, in the above embodiment, by providing a step between the boundary between the slope H11 and the slope H12 and the boundary between the slope H21 and the slope H22, a gap for releasing the burr as shown in FIG. However, the present invention is not limited to this, and the slope H11 and the slope H12 may be connected to the slope H21 and the slope H22 by a plane or a curved surface that gradually approaches the slope H12 and the slope H22 from the boundary between the slope H11 and the slope H21. . In other words, as long as a clearance for escaping burr is secured, the shapes on both sides of the slope H11 and the slope H21 may be shapes other than those in the above-described embodiment, and instead of the slopes H12 and H22, a plane parallel to the horizontal plane. It may be. However, as described with reference to FIGS. 6D and 6E, the slopes H12 and H22 are provided on the side of the wall surfaces H13 and H23 of the slopes H11 and H21 in order to easily remove the mold. It is desirable to extend the wall surfaces H13 and H23 from these slopes H12 and H22.

  If the PBS 103 has no burr, the slopes H12 and H22 may be omitted. When the corner 103g of the PBS 103 is chamfered, the opening H41 does not have to be formed on the housing H side, and the slopes H11 and H21 are extended until the slopes H11 and H21 intersect. good.

  In the above embodiment, the opening H41 is formed to allow the corner 103g of the PBS 103 to escape, but a recess may be formed in place of the opening H41 so that the corner 103g of the PBS 103 is allowed to escape. Further, instead of forming an opening or a recess on the housing H side, the corner 103g may be cut out so that the corner 103g of the PBS 103 does not hit the housing H.

  In addition, the embodiment of the present invention can be variously modified as appropriate within the scope of the technical idea shown in the claims.

DESCRIPTION OF SYMBOLS 1 ... Optical pick-up apparatus 103 ... PBS (optical element)
103a: Incident surface (rear surface)
103b ... Transmission surface (front surface)
103e, 103f ... lower surface 103g ... corner H ... housing (installation member)
H11, H21 ... slope H12 ... slope (gap generation part, relief surface)
H22 ... Slope (gap generating part, relief surface)
H13, H23, H43 ... Wall surface (first wall surface, wall surface portion)
H31 ... Flat surface (contact surface)
H42 ... Wall surface (second wall surface)
P ... leaf spring (elastic member)
P10: Intermediate part (plate-like part, other plate-like part)
P20 ... Bent part (plate-like part, one plate-like part)
P21 ... Support surface (convex surface)
P40 ... Flat part (locking part)
P41 ... Opening (relief part)

Claims (9)

In the mounting structure for mounting the optical element to the installation member,
An elastic member interposed between the optical element and the installation member;
The installation member is
Two slopes inclined at a predetermined angle so that the outside is displaced in the same direction with respect to one horizontal plane;
A first wall formed behind the slope and perpendicular to the slope;
A second wall surface formed in front of the slope and facing the first wall surface,
The optical element includes two lower surfaces respectively placed on the two inclined surfaces,
The elastic member is inserted between the second wall surface and the front surface of the optical element in a state where the two lower surfaces are placed on the two inclined surfaces, and the optical element is elastically generated by the elastic member. The back surface of is pressed against the first wall surface,
An optical element mounting structure characterized by that. In the mounting structure of the optical element according to claim 1,
The elastic member is a plate-like spring bent so that two plate-like portions face each other at a predetermined interval,
The interval between the two plate-like portions is reduced from the predetermined interval, and the two plate-like portions are interposed between the second wall surface and the front surface of the optical element.
An optical element mounting structure characterized by that. In the mounting structure of the optical element according to claim 2,
One plate-like portion of the spring has a curved shape that comes into contact with the front surface of the optical element when the two plate-like portions are interposed between the second wall surface and the front surface of the optical element. A convex surface is formed,
An optical element mounting structure characterized by that. In the mounting structure of the optical element according to claim 3,
A locking portion extending in a direction away from the one plate-like portion is provided on the upper portion of the other plate-like portion of the spring,
The installation member is formed with a contact surface on the upper side of the second wall portion with which the locking portion contacts,
The two plate-like portions are pushed between the second wall surface and the front surface of the optical element until the locking portion comes into contact with the contact surface.
An optical element mounting structure characterized by that. In the mounting structure of the optical element according to any one of claims 1 to 4,
On both sides in the width direction of the slope, gap generating portions are formed for securing a gap between both ends in the width direction of the lower surface when the lower surface is placed on the slope.
An optical element mounting structure characterized by that. In the optical element mounting structure according to claim 5,
The two slopes are formed to face each other,
In the installation member, on the first wall surface side of the slope, a relief surface that is one step lower than the slope and parallel to the slope is formed as the gap generating portion,
The first wall surface includes three wall surface portions arranged on the same plane,
Two of the three wall surface portions are extended upward from the escape surface,
An optical element mounting structure characterized by that. In the mounting structure of the optical element according to claim 6,
The elastic member includes the second wall surface and the optical element so that the elastic force is applied to a center of gravity of a triangle whose apex is a contact position between the three wall surface portions and the back surface of the optical element. Inserted between the front of the
An optical element mounting structure characterized by that. In the optical element mounting structure according to any one of claims 1 to 7,
The installation member is formed with a relief portion that prevents a corner portion of the boundary between the two lower surfaces from coming into contact with the installation member when the lower surface is placed on the slope.
An optical element mounting structure characterized by that. The optical element mounting structure according to any one of claims 1 to 8,
An optical system for irradiating the disk with laser light emitted from a laser light source;
A housing as the installation member on which the optical system is installed, and
At least one optical element constituting the optical system is attached to the housing by the attachment structure.
An optical pickup device characterized by that.

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