JP2009146523A - Light receiving unit and its manufacturing method, optical pickup device, and electronic apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light receiving unit capable of reducing the displacement of a photodetector by a simplified operation, its manufacturing method, an optical pickup device, and an electronic apparatus. <P>SOLUTION: After a position of a photodetector attachment plate 13 supporting the photodetector 11 to an optical base plate 14 is adjusted so that an optical axis and a focus of reflected light 9 reflected by an optical recording medium are made coincident with a center position of a light receiving surface of the photodetector 11, the same quantities of adhesives 15 are injected into two recessed grooves 141 forming gaps between the photodetector attachment plate 13 and the optical base plate 14 in a state that the photodetector attachment plate 13 is made horizontal and the adhesives 15 are packed and applied into the two recessed grooves 141 to fix the photodetector attachment plate 13 to the optical base plate 14. Since application quantities and application shapes of the adhesives 15 applied to the respective recessed grooves 141 can be made uniform, a contraction amount generated when the adhesives are hardened and the change amount of expansion and contraction by a heat change are made uniform and the displacement of the photodetector can be reduced. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a light receiving unit used for reproducing an optical recording medium such as an optical disc, a method for manufacturing the same, an optical pickup device, and an electronic apparatus. The present invention also relates to a light receiving unit that receives the reflected light and optically reads information recorded on an optical recording medium, a manufacturing method thereof, an optical pickup device, and an electronic apparatus.

  A light receiving element used in the optical pickup device receives reflected light from an optical recording medium such as an optical disk, and converts an optical signal of the received light into an electrical signal. The light receiving element is attached to the light receiving element mounting plate, and the light receiving element mounting plate to which the light receiving element is attached is fixed to the frame of the optical pickup device with an adhesive.

FIG. 8 is a front view of the optical base 114 to which the light receiving element 111 is attached by a conventional technique, and FIG. 9 is a bottom view thereof. The light receiving element 111 is a flexible substrate (Flexible
(Printed Circuit; hereinafter referred to as “FPC”) 112. The FPC 112 on which the light receiving element 111 is mounted is fixed to the light receiving element mounting plate 113 with an adhesive. Four concave holes 1141 are formed in the optical base 114.

  The light receiving element mounting plate 113 is attached to the optical base 114 with an adhesive 115 applied to the four concave holes 1141. The light receiving element mounting plate 113 is formed with a reflected light hole 1131 for allowing the reflected light reflected by the optical recording medium to pass therethrough. In the light receiving element mounting plate 113, the position of the light receiving element 111 with respect to the optical axis of the reflected light passing through the reflected light hole 1131 is adjusted before the adhesive is cured. After the position of the light receiving element 111 is adjusted, the adhesive 115 applied to the four concave holes 1141 is cured by an ultraviolet irradiation device or the like.

  The optical pickup device described in Patent Document 1 adjusts the position of the light receiving element with respect to the frame, that is, the optical base so that the center of the light receiving surface of the light receiving element coincides with the optical axis and the focal point of the reflected light, and The four recessed holes to be formed are filled with an adhesive and cured, and the light receiving element mounting plate to which the light receiving elements are attached is fixed to the frame. Alternatively, as in the prior art shown in FIGS. 8 and 9, the four recessed holes formed in the frame are filled with an adhesive, and the light receiving element mounting plate to which the light receiving element is attached is adhered to the frame. Before the adhesive is cured, the position of the light receiving element with respect to the frame, that is, the optical base is adjusted so that the center of the light receiving surface of the light receiving element coincides with the optical axis and the focal point of the reflected light, and the adjusted adhesive is cured. .

  In the optical pickup device described in Patent Document 2, an optical element such as a light receiving element is fixed to a fixing member with an adhesive, and the fixing member is bonded and fixed to the frame in a state where the optical element is positioned at a predetermined position. The fixing member corresponds to the light receiving element mounting plate described above. Adhesives are formed in a plurality of positions so as to be point-symmetric or line-symmetric, and to form an elongated adhesive region along the outer peripheral edge of the fixing member, and the adhesive area of the adhesive at point-symmetrical or line-symmetrical positions And it apply | coats so that an application quantity may become equal. Since the gap between the fixing member and the frame is adhesively fixed after the position of the fixing member is adjusted, it becomes a variable element. Therefore, it is necessary to measure the dimension of the gap after the position adjustment and set the application amount of the adhesive based on the measurement data.

Japanese Patent Laid-Open No. 8-329511 JP 2005-38469 A

  In the conventional technique described above, since the adhesive is applied before the position of the light receiving element with respect to the optical axis of the reflected light is adjusted, workability is poor. Furthermore, by moving the position of the light receiving element mounting plate for adjustment, the shape of the surface on which the adhesive adheres to the light receiving element mounting plate changes, so there is a difference in the amount of shrinkage when the four adhesives are cured. There arises a problem that it occurs and causes a positional deviation after adjustment.

  As in the conventional technology described above and the optical pickup device described in Patent Document 1, when bonding is performed at four locations, if there is a difference in holding power between the four locations, the adhesive may change due to environmental changes and changes over time. When expanding and contracting, there is a problem that the light receiving element is misaligned and defocused. The positional deviation and defocusing of the light receiving element are factors that hinder reliability.

  The optical pickup device described in Patent Document 2 makes the bonding area and the application amount of the adhesive at a plurality of positions constant. After the position adjustment, the gap between the fixing member and the frame is adjusted. There is a problem that it is necessary to measure dimensions and workability is poor.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a light receiving unit, a method for manufacturing the same, an optical pickup device, and an electronic apparatus that can reduce the positional deviation of the light receiving element with a simplified operation.

The present invention includes a light receiving element that outputs an electrical signal corresponding to received light;
A support member for supporting the light receiving element;
A substrate to which the support member is fixed by an adhesive;
Including at least one of the support member and the base material, a groove portion formed in a region facing the support member and the base material, and extending in a predetermined direction;
The adhesive is a light-receiving unit that fills the groove and is provided between the groove and a portion facing at least one of the support member and the base material.

Moreover, the present invention is characterized in that the groove is formed only on the base material.
In the invention, it is preferable that the groove is formed only in the support member.

  According to the present invention, the support member is a portion bonded by an adhesive filled in the groove portion, and a through-hole penetrating the support member is formed in a central portion in a direction in which the groove portion extends. It is characterized by that.

  Further, according to the present invention, when the support member is fixed to the base material, the groove portion has two positions that are rotationally symmetric with respect to an axis passing through the center of the light receiving surface of the light receiving element supported by the support member. It is formed in this.

  According to the present invention, the groove formed in the base material is parallel and is the length of the portion of the support member that is bonded by the adhesive filled in the groove, and the groove extends. It is characterized in that it is longer than the length in the direction.

  In the invention, it is preferable that the support member has a length of a portion bonded by an adhesive filled in the groove portion, and a length in a direction in which the groove portion extends is a length of the light receiving element to be supported. The groove is shorter than the length in the extending direction.

  Further, the present invention is characterized in that the groove portions formed at the two positions are formed to a uniform depth in the entire region of the groove portions.

  Further, the present invention is characterized in that the grooves formed at the two positions have the same depth and the same width.

The present invention also includes the light receiving unit;
A light source that emits light;
And an optical unit that guides light emitted from the light source in the direction of the optical recording medium and guides light reflected from the optical recording medium to a light receiving element included in the light receiving unit.

In addition, the present invention is an electronic apparatus including the optical pickup device.
The present invention is also a method of manufacturing a light receiving unit including a light receiving element that outputs an electrical signal corresponding to received light, a support member that supports the light receiving element, and a base material to which the support member is fixed by an adhesive. And
An adjustment step of adjusting the position where the support member is fixed to the base material so that the center of the light receiving surface of the light receiving element coincides with the optical axis and the focal point of the light to be received;
After adjusting the position where the support member is fixed to the base material in the adjustment step, the adhesive is injected along the groove formed on the base material or the support member to fix the support member to the base material. And a step of manufacturing the light receiving unit.

The present invention is also a method of manufacturing a light receiving unit including a light receiving element that outputs an electrical signal corresponding to received light, a support member that supports the light receiving element, and a base material to which the support member is fixed by an adhesive. And
An adjustment step for adjusting the position where the support member is fixed to the base material so that the center of the light receiving surface of the light receiving element coincides with the optical axis and the focal point of the light to be received;
After adjusting the position at which the support member is fixed to the base material in the adjustment step, among the portions where the support member is adhered by an adhesive injected into the base material or a groove formed in the support member, A light receiving unit comprising: a fixing step of injecting an adhesive along the groove portion from a through hole formed in a central portion in a direction in which the groove portion extends to fix the support member to the base material. It is a manufacturing method.

In the present invention, the groove is formed in two places,
In the fixing step, an adhesive is injected into the two groove portions at the same time.

  According to the present invention, the light receiving element converts the received light into an electrical signal and outputs an electrical signal corresponding to the received light. The light receiving element is supported by a support member, and the support member is fixed to the substrate by an adhesive. At least one of the support member and the base material is formed with a groove portion that is formed in a region where the support member and the base material face and extends in a predetermined direction, and the groove portion is filled with an adhesive, And at least one of the support member and the base material, and the portion facing the groove, and the support member is fixed to the base material.

  By adopting such a configuration, it is possible to reduce variations in the area and amount of the adhesive applied to the support member at the time of manufacture, so that the difference in shrinkage when the adhesive is cured and changes due to thermal changes. The light receiving unit can be realized in which the amount is uniform and the positional deviation after adjustment is reduced, and the quality of the optical unit can be improved. In other words, since the variation in the adhesive area and application amount of the filled adhesive is reduced, the amount of change of the adhesive due to curing, thermal change and aging can be made uniform, and the positional deviation of the light receiving element is reduced, The quality of the light receiving unit can be improved. Furthermore, after the position is adjusted, it is not necessary to measure the dimension of the gap between the support member and the base material, and the operation can be simplified.

  According to the invention, the light receiving unit, the light source that emits light, the light emitted from the light source is guided in the direction of the optical recording medium, and the light reflected by the optical recording medium is applied to the light receiving element included in the light receiving unit. And an optical part for guiding. Therefore, since the light receiving unit with little positional deviation of the light receiving elements is used, a highly reliable and stable optical pickup device can be provided.

  Moreover, according to this invention, the said optical pick-up apparatus is included. Therefore, since the pickup device using the light receiving unit with a small positional deviation of the light receiving elements is used, a highly reliable and stable electronic device can be provided.

  Further, according to the present invention, in manufacturing a light receiving unit that includes a light receiving element that outputs an electrical signal according to received light, a support member that supports the light receiving element, and a base material to which the support member is fixed by an adhesive. In the adjustment step, the position at which the support member is fixed to the substrate is adjusted so that the center of the light receiving surface of the light receiving element coincides with the optical axis and focus of the light to be received. In the fixing step, after adjusting the position where the supporting member is fixed to the base material in the adjusting step, an adhesive is injected along the groove formed in the base material or the supporting member to fix the supporting member to the base material. .

  Therefore, the amount of adhesive is determined by the depth and width of the groove, and further, after the adjustment, the adhesive is injected and fixed, so it is necessary to consider the influence on the change in the state of the adhesive due to the work during adjustment. Therefore, it is possible to suppress a difference in the shrinkage amount of the adhesive at the time of curing, and to reduce the positional deviation of the light receiving element. Furthermore, since the operation of injecting and applying the adhesive into the gap between the base material and the support member is performed after the adjustment of the position where the light receiving element is arranged, the operation time can be shortened.

  Further, according to the present invention, in manufacturing a light receiving unit that includes a light receiving element that outputs an electrical signal according to received light, a support member that supports the light receiving element, and a base material to which the support member is fixed by an adhesive. In the adjustment step, the position at which the support member is fixed to the substrate is adjusted so that the center of the light receiving surface of the light receiving element coincides with the optical axis and focus of the light to be received. And in the fixing step, after adjusting the position where the supporting member is fixed to the base material in the adjusting step, among the portions where the supporting member is adhered by the adhesive injected into the groove portion formed in the base material or the supporting member, From the through hole formed at the center position in the direction in which the groove extends, an adhesive is injected along the groove to fix the support member to the substrate.

  Therefore, since the adhesive injected from the through hole is spread and applied uniformly toward both ends of the groove, the applied shape of the adhesive is stabilized, and the positional deviation of the light receiving element due to shrinkage during curing can be reduced. it can. In particular, when the support member is adjusted horizontally, the adhesive flow is not affected by gravity and spreads in the groove direction, so that a uniform stress is applied from the through hole toward both ends of the groove. It is possible to have an adhesive state. Furthermore, since the operation of injecting and applying the adhesive into the gap between the base material and the support member is performed after the adjustment of the position where the light receiving element is arranged, the operation time can be shortened.

  1 is a front view schematically showing the configuration of a light receiving unit 10 according to an embodiment of the present invention, FIG. 2 is a bottom view schematically showing the configuration of the light receiving unit 10, and FIG. 2 is a side view schematically showing the configuration of the light receiving unit 10. FIG. The light receiving unit manufacturing method according to the present invention is a manufacturing method for manufacturing the light receiving unit 10.

  The light receiving unit 10 includes a light receiving element 11, a flexible printed circuit (hereinafter referred to as “FPC”) 12, a light receiving element mounting plate 13 and an optical base 14. The light receiving element 11 is configured by, for example, a photodiode, receives reflected light from an optical recording medium such as an optical disk, converts an optical signal of the received light into an electrical signal, and outputs the electrical signal. The FPC 12 is formed with printed wiring, and transmits an electrical signal from the light receiving element 11 to be mounted to another part to which the FPC 12 is connected.

  The light receiving element mounting plate 13 which is a support member is made of, for example, an aluminum alloy plate, supports the light receiving element 11 by fixing the FPC 12 with an adhesive, and is fixed to the optical base 14 with the adhesive 15. The adhesive 15 is realized by, for example, an ultraviolet curable resin. The light receiving element mounting plate 13 supports the light receiving element 11 at the central portion of the light receiving element mounting plate 13, the arm portion extends on both sides of the central portion supporting the light receiving element 11, and the light receiving element mounting plate at the ends of both arm portions. A notch 131 for determining the position for gripping 13 as a predetermined position is formed.

  The optical base 14 that is a base is made of, for example, a zinc alloy, and the light receiving element mounting plate 13 is fixed by an adhesive 15. When the light receiving unit 10 is mounted on an optical pickup device or the like, the optical base 14 may be a frame of the optical pickup device. A concave groove 141 and a reflected light hole 142 are formed in the optical base 14.

  The concave groove 141 forming the groove portion is a groove for filling the adhesive 15 for fixing the light receiving element mounting plate 13, and is supported by the light receiving element mounting plate 13 when the light receiving element mounting plate 13 is fixed. The light receiving element 11 is formed in parallel to two positions that are rotationally symmetric with respect to an axis passing through the center of the light receiving surface. The concave groove 141 extends in a predetermined direction, and one end of the concave groove 141 in the extending direction is formed with an adhesive receiving portion for stopping the flow of the adhesive 15 to be filled, and the other end is the adhesive 15. In order to facilitate insertion of the needle of the dispenser for injecting the liquid into the concave groove 141, the needle is opened. The predetermined direction is a longitudinal direction in which the arm portion of the light receiving element mounting plate 13 extends and a direction perpendicular to the thickness direction of the light receiving element mounting plate 13.

  The depth of the concave groove 141 is uniform throughout the entire area of the concave groove 141. The length of the concave groove 141 is the length of the portion of the arm portion of the light receiving element mounting plate 13 that is adhered by the adhesive 15 filled in the concave groove 141 (hereinafter referred to as “adhesive portion”). 141 is longer than the length in the extending direction. The two concave grooves 141 are formed to have the same depth, the same width, and the same length. For example, the depth is 0.8 mm, the width is 1.6 mm, and the length is longer than the bonded portion. Both sides are longer by 0.8 mm. The adjustment of the holding force by the adhesive 15 can be performed by adjusting the width of the concave groove 141.

  As described above, the concave groove 141 is formed in the optical base 14. Since the optical base 14 so-called housing is generally cast by die casting, when the concave groove 141 is formed in the optical base 14, the concave groove 141 can be easily formed by a mold.

  Further, the concave groove 141 is rotationally symmetric with respect to an axis passing through the center of the light receiving surface of the light receiving element 11 supported by the light receiving element mounting plate 13 when the light receiving element mounting plate 13 is fixed to the optical base 14. Since it is formed at two positions, the difference in misalignment due to shrinkage and change over time is reduced by making the application amount and application area of the adhesive 15 to the two concave grooves 141 the same. it can.

  Further, the concave groove 141 formed on the optical base 14 is parallel and has a length of a portion bonded to the concave groove 141 by the adhesive 15 filled in the concave groove 141. 141 is longer than the length in the direction in which it extends, and by applying the adhesive 15 so as to protrude from the width of the light receiving element mounting plate 13, a stable adhesive in the gap between the light receiving element mounting plate 13 and the optical base 14 A coating amount of 15 can be ensured, and the amount of shrinkage during curing can be made constant.

  Further, since the concave grooves 141 formed at the two positions are formed to have a uniform depth in the entire area of the concave grooves 141, the gap between the light receiving element mounting plate 13 and the optical base 14 is parallel. Thus, the thickness of the adhesive 15 can be formed uniformly, and the adhesive holding force can be stabilized. Further, by adjusting the width of the concave groove 141, the adhesion holding force can be adjusted.

  Further, since the depths and widths of the concave grooves 141 formed at the two positions are the same, the shrinkage amount when the adhesive 15 is cured can be made the same amount and deviates from the adjustment range after bonding. Defects can be eliminated.

  The reflected light hole 142 is a through-hole penetrating the optical base 14 so as to pass the reflected light 9 reflected by the optical recording medium and guide it to the light receiving element 11 supported by the light receiving element mounting plate 13. It is formed. The length in the direction in which the concave groove 141 extends by the length of the adhesion portion of the light receiving element mounting plate 13 is longer than the length in the direction in which the concave groove 141 extends by the length of the light receiving element 11 supported by the light receiving element mounting plate 13. Also short. Since the length of the adhesion portion of the light receiving element mounting plate 13 is suppressed to a variation less than the tolerance of the components, the variation in the application area of the adhesive 15 is small, and the application area can be stabilized.

  As described above, the light receiving element mounting plate 13 is the length of the portion bonded by the adhesive 15 filled in the concave groove 141 and the length in the direction in which the concave groove 141 extends is the light receiving element 11 to be supported. Therefore, the insertion area of the dispenser needle for injecting the adhesive 15 can be secured, and workability can be improved. .

  The size of the light receiving element 11 used in the optical pickup device is determined by the optical design, and an appropriate size is required. The width of the light receiving element mounting plate 13 that supports the light receiving element 11 is limited by the size of the light receiving element 11. In particular, a thin optical pickup device is required to reduce the thickness as much as possible. The width of the light receiving element mounting plate 13 that supports the light receiving element 11 needs to match the size of the light receiving element 11, but the width of the bonding portion of the light receiving element mounting plate 13 is shorter than the width of the light receiving element 11. And can meet these limitations and requirements.

  In the embodiment described above, the concave groove 141 is formed in the optical base 14, but the concave groove 141 may be formed in the light receiving element mounting plate 13. As described above, when the concave groove 141 is formed in the optical element mounting plate 13, the length of the concave groove in the direction in which the concave groove 141 extends depends on the plate width of the light receiving element mounting plate 13 in the direction in which the concave groove 141 extends. Therefore, the accuracy of the length of the concave groove 141 formed in the light receiving element mounting plate 13 can be increased. The concave groove 141 may be formed on both the optical base 14 and the light receiving element mounting plate 13.

  FIG. 4 is a flowchart showing the processing procedure of the method for manufacturing the light receiving unit 10. When the FPC 12 mounted with the light receiving element 11 is fixed to the light receiving element mounting plate 13 with an adhesive, the process proceeds to Step A1.

  In step A1, which is an adjustment step, the position of the light receiving element mounting plate 13 that supports the light receiving element 11 is adjusted. That is, the position of the light receiving element mounting plate 13 with respect to the optical base 14 is the position of the center of the light receiving surface of the light receiving element 11 with respect to the optical axis and focal point of the reflected light 9 that is the light to be received reflected from the optical recording medium. Adjusted to match. This adjustment is performed using, for example, an adjustment device. The adjusting device grips the light receiving element mounting plate 13 with the notches 131 formed on both arms of the light receiving element mounting plate 13 and moves the position of the light receiving element mounting plate 13 relative to the optical base 14. The adjusting device adjusts the optical axis and the focal point of the reflected light 9 to coincide with the center position of the light receiving surface of the light receiving element 11 while observing the electric signal output from the light receiving element 11, and receives the light receiving element mounting plate 13. Determine the position to arrange and complete the adjustment.

  In step A2, which is a fixing step, when the adjustment is completed in step A1, the adhesive 15 is injected along the concave groove 141 to fix the light receiving element mounting plate 13 to the optical base 14. In the state where the light receiving element mounting plate 13 is horizontal, the dispenser has the same amount of adhesive from the dispenser needle into the two concave grooves 141 forming the gap between the light receiving element mounting plate 13 and the optical base 14. 15 is injected, and the adhesive 15 is filled in the two concave grooves 141 and applied to the light receiving element mounting plate 13 and the optical base 14, and the light receiving element mounting plate 13 is fixed to the optical base 14.

  The application amount of the adhesive 15 that fills the two concave grooves 141 and is applied to the light receiving element mounting plate 13 and the optical base 14 is such that the tip portion of the adhesive 15 slightly differs from the bonding portion of the light receiving element mounting plate 13. It is the amount that pops out. That is, the amount of the adhesive 15 is applied to at least the entire bonded portion of the light receiving element mounting plate 13.

  Thus, the light receiving element 11 receives the reflected light from the optical recording medium, the optical signal of the received light is converted into an electrical signal, the light receiving element mounting plate 13 supports the light receiving element 11, and the optical base The light receiving element mounting plate 13 is fixed by an adhesive 15 by the base 14, and the adhesive 15 is filled in the concave groove 141.

  Accordingly, the variation in the area and amount of the adhesive 15 applied to the light receiving element mounting plate 13 is reduced, so that the difference in shrinkage during curing and the amount of change due to thermal change are equalized, and the positional deviation after adjustment is reduced. In addition, the quality of the light receiving unit 10 can be improved. That is, since the variation in the adhesion area and the application amount of the applied adhesive 15 is reduced, the amount of change of the adhesive 15 due to curing, thermal change and aging can be made uniform, and the positional deviation of the light receiving element 11 can be reduced. Therefore, the quality of the light receiving unit 10 can be improved. Furthermore, after the position is adjusted, there is no need to measure the size of the gap between the light receiving element mounting plate 13 and the optical base 14, and the operation can be simplified.

  As described above, in the flowchart shown in FIG. 4, the light receiving element 11 that receives the reflected light from the optical recording medium and converts the optical signal of the received light into an electrical signal, and the light receiving element mounting plate 13 that supports the light receiving element 11. In manufacturing the light receiving unit including the optical base 14 to which the light receiving element mounting plate 13 is fixed by the adhesive 15, in step A 1, the position at which the light receiving element mounting plate 13 is fixed to the optical base 14 is set to the light receiving element 11. The center of the light receiving surface is adjusted so as to coincide with the optical axis and the focal point of the reflected light. In step A2, the position where the light receiving element mounting plate 13 is fixed to the optical base 14 is adjusted in the adjusting step, and then the adhesive is formed along the concave groove 141 formed in the optical base 14 or the light receiving element mounting plate 13. 15 is injected to fix the light receiving element mounting plate 13 to the optical base 14.

  Accordingly, the amount of the adhesive is determined by the depth and width of the concave groove 141, and further, after the adjustment, the adhesive is injected and fixed. Therefore, the influence on the change in the state of the adhesive due to the operation at the time of adjustment is considered. Therefore, it is possible to suppress the occurrence of a difference in the shrinkage amount of the adhesive at the time of curing, and to reduce the positional deviation of the light receiving element 11. Furthermore, since the work of injecting and applying the adhesive 15 into the gap between the light receiving element mounting plate 13 and the optical base 14 is performed after adjusting the position where the light receiving element 11 is arranged, the working time can be shortened. .

  FIG. 5 is a bottom view schematically showing a configuration of a light receiving unit 20 according to another embodiment of the present invention. The method for manufacturing a light receiving unit according to the present invention is a method for manufacturing the light receiving unit 20.

  The light receiving unit 20 includes a light receiving element 21, an FPC 22, a light receiving element mounting plate 23, and an optical base 24. The light receiving element 21 and the FPC 22 are the same as the light receiving element 11 and the FPC 12 shown in FIG. 1, respectively, and description thereof is omitted to avoid duplication.

  The light receiving element mounting plate 23 as a support member is the same as the light receiving element mounting plate 13 shown in FIG. 1 except that the adhesive injection hole 232 is formed. The description is omitted. The adhesive injection hole 232 is a through-hole penetrating the light receiving element mounting plate 23, and is an adhesive portion between both arms of the light receiving element mounting plate 23, and is formed in the central portion in the direction in which the groove 241 extends. The The adhesive 25 injected into the concave groove 241 that is two groove portions is injected from the respective adhesive injection holes 232.

  The optical base 24 which is a base material is the same as the optical base 14 shown in FIG. 1 except that adhesive receiving portions are formed at both ends of the concave groove 241 in the extending direction of the concave groove 241. The description of the same part is omitted to avoid duplication.

  Since the adhesive injection hole 232 is formed in the central portion of the adhesive portion of the light receiving element mounting plate 23, the injected adhesive 15 spreads toward both ends of the concave groove 241. Therefore, the time for filling the concave groove 241 with the adhesive 15 can be made shorter than in the case of the light receiving unit 10. Furthermore, since the length from the injection position of the adhesive 15 to the tip portion of the filled adhesive is shorter than that of the light receiving unit 10, the application shape can be stabilized.

  As described above, the light receiving element mounting plate 23 is a portion bonded by the adhesive 25 filled in the concave groove 241, and penetrates the light receiving element mounting plate 23 in the center in the direction in which the concave groove 241 extends. Since the adhesive injection hole 232, which is a through hole, is formed, the adhesive 25 injected from the adhesive injection hole 232 is uniformly spread toward both ends of the concave groove 241 and applied. The application area of the agent 25 is more stable, and the displacement due to the shrinkage of the adhesive 25 can be reduced.

  FIG. 6 is a flowchart showing the processing procedure of the method for manufacturing the light receiving unit 20. When the FPC 22 mounted with the light receiving element 21 is fixed to the light receiving element mounting plate 23 with an adhesive, the process proceeds to Step B1. Step B1, which is an adjustment step, is the same as step A1 in the flowchart shown in FIG. 4, and description thereof is omitted to avoid duplication.

  In step B2, which is a fixing step, when the adjustment is completed in step B1, the adhesive 25 is injected from the two adhesive injection holes 232 to fix the light receiving element mounting plate 23 to the optical base 24. The dispenser injects two adhesives from the needle of the dispenser into two concave grooves 241 that form a gap between the light receiving element mounting plate 23 and the optical base 24 in a state where the light receiving element mounting plate 23 is horizontal. The same amount of the adhesive 25 is injected into the hole 232, the adhesive 25 is filled in the two concave grooves 241 and applied to the light receiving element mounting plate 23 and the optical base 24, and the light receiving element mounting plate 23 is optically applied. Secure to the base 24.

  The application amount of the adhesive 25 filled in the two concave grooves 241 and applied to the light receiving element mounting plate 23 and the optical base 24 is slightly different from the adhesive portion of the light receiving element mounting plate 23 at the tip portion of the adhesive 25. It is the amount that pops out. That is, the amount of the adhesive 25 is applied to at least the bonded portion of the light receiving element mounting plate 23.

  As described above, in the flowchart shown in FIG. 6, the light receiving element 21 that receives the reflected light from the optical recording medium and converts the optical signal of the received light into an electric signal, and the light receiving element mounting plate 23 that supports the light receiving element 21. In manufacturing the light receiving unit including the optical base 24 to which the light receiving element mounting plate 23 is fixed by the adhesive 25, in step B1, the position at which the light receiving element mounting plate 23 is fixed to the optical base 24 is set to the light receiving element 21. The center of the light receiving surface is adjusted so as to coincide with the optical axis and the focal point of the reflected light. In step B2, the position where the light receiving element mounting plate 23 is fixed to the optical base 24 is adjusted in the adjusting step, and then the adhesive is injected into the groove 241 formed in the optical base 24 or the light receiving element mounting plate 23. In the portion where the light receiving element mounting plate 23 is bonded by the agent 25, the adhesive 25 is injected along the concave groove 241 from the adhesive injection hole 232 formed in the central portion in the direction in which the concave groove 241 extends. Then, the light receiving element mounting plate 23 is fixed to the optical base 24.

  Therefore, since the adhesive 25 injected from the adhesive injection hole 232 is spread and applied uniformly toward both ends of the concave groove 241, the application shape of the adhesive 25 is stabilized, and light reception due to shrinkage at the time of curing. The positional deviation of the element can be reduced. In particular, when the light receiving element mounting plate 23 is adjusted in a horizontally disposed state, the flow of the adhesive 25 is not influenced by gravity but spreads so as to flow in the groove direction of the concave groove 241. An adhesive state having a uniform stress from the hole 232 toward both ends of the concave groove 241 can be obtained. Furthermore, since the work of injecting and applying the adhesive 25 into the gap between the light receiving element mounting plate 23 and the optical base 24 is performed after the position where the light receiving element 21 is arranged, the working time can be shortened. .

  Further, the concave grooves 241 are formed at two locations, and in the step B2, the adhesive 25 is injected into the concave grooves 241 at the two locations at the same time, so that the application time can be shortened and each concave groove 241 The difference in coating time can be eliminated. Therefore, the difference in the application shape of the adhesive 25 can be reduced, the difference in shrinkage during curing is reduced, and the quality of the light receiving unit can be stabilized.

  The effect of the invention related to the light receiving unit 20 is that the adhesive injection hole 232 is formed in the light receiving element mounting plate 23 and the effect obtained by injecting the adhesive 15 from the adhesive injection hole 232 is excluded from the light receiving unit 10. This is the same as the effect of the invention.

  FIG. 7 is a diagram schematically showing the configuration of the optical pickup device 1 according to the embodiment of the present invention. The optical pickup device 1 is an optical pickup device used in an electronic device that can record and reproduce information on two types of optical recording media.

  The optical pickup device 1 includes a first laser light source 31, a second laser light source 32, a first collimating lens 33, a second collimating lens 34, a first prism 35, a second prism 36, and a first objective. Lens 37, second objective lens 38, actuator 39, condenser lens 40, light receiving element 41, light receiving element mounting plate 42, optical base 43, first laser light source mounting plate 44, and second laser light source mounting plate 45 It is comprised including.

  The first laser light source 31 is a first optical recording medium of two types of optical recording media, for example, a light source for CD (Compact Disk), and emits laser light having a wavelength for CD. The second laser light source 32 is a light source for a second optical recording medium that is different from the first optical recording medium of the two types of optical recording media, for example, a DVD (Digital Versatile Disk), and has a wavelength for DVD. The laser beam is emitted.

  The first collimating lens 33 transmits the laser light emitted from the first laser light source 31 as parallel light. The second collimating lens 34 transmits the laser light emitted from the second laser light source 32 as parallel light. The first prism 35 reflects the parallel light transmitted through the first collimating lens 33, changes the direction of the parallel light toward the first objective lens 37, and reflects it by the first optical recording medium. The reflected light is transmitted without being reflected, and further, the parallel light emitted from the second laser light source 32 and transmitted through the second collimating lens 34 and the second prism 36 is also transmitted without being reflected. To do.

  The second prism 36 transmits the parallel light transmitted through the second collimating lens 34 without reflecting, reflects the reflected light reflected by the first optical recording medium, and changes the direction of the reflected light. The direction is changed toward the condenser lens 40. The first objective lens 37 condenses the parallel light emitted from the first laser light source 31 and reflected by the first prism 35 on the recording surface of the first optical recording medium, and the first light. The reflected light reflected by the recording medium is assumed to be parallel light. The second objective lens 38 condenses the parallel light emitted from the second laser light source 32 and transmitted through the first prism 35 on the recording surface of the second optical recording medium, and the second light. The reflected light reflected by the recording medium is assumed to be parallel light.

  The actuator 39 is a drive unit that supports the first objective lens 37 and the second objective lens 38 and moves the first objective lens 37 and the second objective lens 38 so as to follow the track on the recording surface. is there. The condenser lens 40 condenses the reflected light reflected by the second prism 36 on the light receiving surface of the light receiving element 41. The light receiving element 41 is configured by, for example, a photodiode, receives reflected light collected by the condenser lens 40, converts an optical signal of the received light into an electrical signal, and outputs the electrical signal. The light receiving element mounting plate 42 supports the light receiving element 41.

  The optical base 43 includes a first collimating lens 33, a second collimating lens 34, a first prism 35, a second prism 36, an actuator 39, a condensing lens 40, a light receiving element mounting plate 42, and a first laser. This is a frame for fixing the light source mounting plate 44 and the second laser light source mounting plate 45. The first laser light source mounting plate 44 supports the first laser light source 31. The second laser light source mounting plate 45 supports the second laser light source 32.

  The light receiving element 41, the light receiving element mounting plate 42, and the optical base 43 constitute the light receiving unit 10 shown in FIG. 1 or the light receiving unit 20 shown in FIG. That is, the light receiving element 41, the light receiving element mounting plate 42, and the optical base 43 are the light receiving element 11, the light receiving element mounting plate 13, and the optical base 14 of the light receiving unit 10, or the light receiving element 21, of the light receiving unit 20, respectively. These are the light receiving element mounting plate 23 and the optical base 24.

  The optical pickup device 1 shown in FIG. 7 can record and reproduce information on two types of optical recording media, but can record and reproduce information on one or more types of optical recording media. It may be a thing. In the case of one type, the first collimating lens 33, the first prism 35, the first objective lens 37, the combination of the second objective lens 38 and the condenser lens 40, and the second collimating lens 34, the second Any combination of at least one of the combinations of the prism 36, the second objective lens 38, and the condenser lens 40 may be included.

  At least one of the first laser light source 31 and the second laser light source 32 is a light source. A combination of the first collimating lens 33, the first prism 35, the first objective lens 37, the second objective lens 38 and the condenser lens 40, and the second collimating lens 34, the second prism 36, the second At least one of the combinations of the objective lens 38 and the condenser lens 40 is an optical unit.

  As described above, the optical pickup device 1 includes the light receiving unit, at least one of the first laser light source 31 and the second laser light source 32 that emit light, the first laser light source 31 and the second laser light source. An optical unit that guides light emitted from at least one of 32 in the direction of the optical recording medium and guides light reflected by the optical recording medium to the light receiving element 41 included in the light receiving unit. The optical unit includes a first collimating lens 33, a first prism 35, a first objective lens 37, a combination of a second objective lens 38 and a condenser lens 40, and a second collimating lens 34, a second prism. 36, at least one combination of the second objective lens 38 and the condenser lens 40.

  Therefore, since the light receiving unit with a small positional deviation of the light receiving element 41 is used, a highly reliable and stable optical pickup device 1 can be provided.

  An optical pickup device using the light receiving unit 10 shown in FIG. 1 or the light receiving unit 20 shown in FIG. 5, for example, the optical pickup device 1 shown in FIG. 7, stores information on an optical recording medium such as a CD, DVD, or Blu-ray disc. The present invention can be applied to electronic equipment such as an information recording / reproducing apparatus for recording and reproducing.

  As described above, the electronic apparatus includes the optical pickup device. Therefore, since the pickup device using the light receiving unit with a small positional deviation of the light receiving elements is used, a highly reliable and stable electronic device can be provided.

  As described above, the groove for applying the adhesive is formed in the optical base or the light receiving element mounting plate at a position that is rotationally symmetric with respect to the axis passing through the center of the light receiving surface of the light receiving element. By applying the adhesive by injecting the adhesive into the groove while keeping the distance between the optical base and the optical base constant, the application amount and the application shape of the adhesive applied to each groove can be made uniform.

  Since the application amount and the application shape of the adhesive applied to each groove are uniform, the shrinkage amount when the adhesive is cured can be made the same, and the positional deviation of the light receiving element after adjustment can be reduced. it can. Furthermore, since the amount and shape of the adhesive applied to each groove are uniform, the amount of change in expansion and contraction due to thermal changes is uniform, and the position of the light receiving element is shifted even when the environment changes and changes over time. Can be reduced. Therefore, it is possible to manufacture and provide a light receiving unit with high reliability and stable quality, an optical pickup device using the light receiving unit, and an electronic apparatus using the optical pickup device.

It is a front view which shows typically the structure of the light reception unit 10 which is one Embodiment of this invention. 2 is a bottom view schematically showing a configuration of a light receiving unit 10. FIG. 2 is a side view schematically showing a configuration of a light receiving unit 10. FIG. 4 is a flowchart showing a processing procedure of a method for manufacturing the light receiving unit 10. It is a bottom view which shows typically the structure of the light-receiving unit 20 which is the other embodiment of this invention. 4 is a flowchart illustrating a processing procedure of a method for manufacturing the light receiving unit 20. It is a figure which shows typically the structure of the optical pick-up apparatus 1 which is one Embodiment of this invention. It is a front view of the optical base 114 with which the light receiving element 11 was attached by the prior art. It is a bottom view of the optical base 114 to which the light receiving element 11 was attached by the conventional technique.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Optical pick-up apparatus 9 Reflected light 10,20 Light receiving unit 11, 21, 41, 111 Light receiving element 12, 22, 112 FPC
13, 23, 42, 113 Light receiving element mounting plate 14, 24, 43, 114 Optical base 15, 25, 115 Adhesive 31 First laser light source 32 Second laser light source 33 First collimating lens 34 Second Collimating lens 35 First prism 36 Second prism 37 First objective lens 38 Second objective lens 39 Actuator 40 Condensing lens 44 First laser light source mounting plate 45 Second laser light source mounting plate 131, 231 Cutting Notch portion 141 concave groove 142, 1131 reflected light hole 232 adhesive injection hole 1141 concave hole

Claims (14)

A light receiving element that outputs an electrical signal corresponding to the received light;
A support member for supporting the light receiving element;
A substrate to which the support member is fixed by an adhesive;
Including at least one of the support member and the base material, a groove portion formed in a region facing the support member and the base material, and extending in a predetermined direction;
The adhesive is filled in the groove, and is provided between the groove and a portion of at least one of the support member and the base material that faces the groove.   The light receiving unit according to claim 1, wherein the groove is formed only on the base material.   The light receiving unit according to claim 1, wherein the groove is formed only in the support member.   The support member is a portion bonded by an adhesive filled in the groove portion, and a through hole penetrating the support member is formed in a central portion in a direction in which the groove portion extends. The light receiving unit according to claim 1.   The groove is formed at two positions that are rotationally symmetric with respect to an axis passing through the center of the light receiving surface of a light receiving element supported by the support member when the support member is fixed to the substrate. The light receiving unit according to claim 1.   The groove formed in the base material is parallel and is the length of the portion of the support member that is bonded by the adhesive filled in the groove, and the length in the direction in which the groove extends. The light receiving unit according to claim 2, wherein the light receiving unit is longer.   The support member is a length of a portion bonded by an adhesive filled in the groove portion, and a length in a direction in which the groove portion extends is a length of the light receiving element to be supported, and the groove portion The light receiving unit according to claim 2, wherein the light receiving unit is shorter than the length in the extending direction.   The light receiving unit according to claim 1, wherein the groove portions formed at the two positions are formed to have a uniform depth in the entire region of the groove portion.   The light receiving unit according to claim 5, wherein the groove portions formed at the two positions have the same depth and the same width. The light receiving unit according to any one of claims 1 to 9,
A light source that emits light;
An optical pickup device comprising: an optical unit that guides light emitted from a light source in a direction of the optical recording medium and guides light reflected by the optical recording medium to a light receiving element included in the light receiving unit.   An electronic apparatus comprising the optical pickup device according to claim 10. A method of manufacturing a light receiving unit including a light receiving element that outputs an electrical signal corresponding to received light, a support member that supports the light receiving element, and a base material to which the support member is fixed by an adhesive,
An adjustment step of adjusting the position where the support member is fixed to the base material so that the center of the light receiving surface of the light receiving element coincides with the optical axis and the focal point of the light to be received;
After adjusting the position where the support member is fixed to the base material in the adjustment step, the adhesive is injected along the groove formed on the base material or the support member to fix the support member to the base material. A step of manufacturing the light receiving unit. A method of manufacturing a light receiving unit including a light receiving element that outputs an electrical signal corresponding to received light, a support member that supports the light receiving element, and a base material to which the support member is fixed by an adhesive,
An adjustment step for adjusting the position where the support member is fixed to the base material so that the center of the light receiving surface of the light receiving element coincides with the optical axis and the focal point of the light to be received;
After adjusting the position at which the support member is fixed to the base material in the adjustment step, among the portions where the support member is adhered by an adhesive injected into the base material or a groove formed in the support member, A light receiving unit comprising: a fixing step of injecting an adhesive along the groove portion from a through hole formed in a central portion in a direction in which the groove portion extends to fix the support member to the base material. Manufacturing method. The groove is formed in two places,
The method for manufacturing a light receiving unit according to claim 13, wherein in the fixing step, an adhesive is simultaneously injected into the two groove portions.

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