JP2013148393A - Optical range-finding sensor and electronic apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical range-finding sensor that can prevent positional deviations between constituent members due to expansion upon heating and contraction upon cooling, and thereby prevent fluctuations in range-finding characteristics.SOLUTION: An optical range-finding sensor has a structure in which two flanks 15B and 15C of a metal-made lens plate 15 hold between them two side faces 7B and 7C of a first light intercepting mold resin part 7, and this structure can prevent the metal-made lens plate 15 from deviating in position in the direction of crossing the array direction of a light emitting side lens 16 and a light receiving side lens 18 relative to the first light intercepting mold resin part 7. A second light intercepting mold resin part 21 covers the two flanks 15B and 15C of the metal-made lens plate 15 and can thereby prevent the metal-made lens plate 15 from deviating in position in the direction of crossing the array direction relative to the first light intercepting mold resin part 7.

Description

  The present invention relates to an optical distance measuring sensor and an electronic apparatus for detecting a distance to an object existing in a certain range.

  Japanese Patent Application Laid-Open No. 2010-48606 discloses an optical distance measuring sensor. As shown in FIG. 4A, which is a top view, and FIG. 4B, which is a cross-sectional view taken along line AA of FIG. 4A, the optical distance measuring sensor of the first conventional example includes a light emitting element 502 and a light spot. A light receiving element 503 for detecting the position is mounted. The light receiving element 503 has a circuit (not shown) for processing the light receiving signal and driving the light emitting element 502 at a predetermined timing. The light emitting element 502 and the light receiving element 503 are individually sealed with a translucent resin body 505 and a translucent resin body 506, respectively.

In the optical distance measuring sensor of the first conventional example, a light-shielding resin body 507 is integrally formed so as to cover the lead frame 501 and the translucent resin bodies 505 and 506. The light-shielding resin body 507 exposes the portions 505A and 506A serving as the light windows of the light-transmitting resin bodies 505 and 506. In addition, this optical distance sensor
A light-emitting side lens 508 and a light-receiving side lens 510 are formed of thermoplastic resin (acrylic, polycarbonate, or the like). The light emitting side lens 508 and the light receiving side lens 510 are attached to a case 511 made of a thermoplastic resin such as ABS (acrylonitrile, butadiene, styrene). The case 511 is fitted to the light shielding resin body 507.

  The light emitting side, light receiving side lenses 508 and 510 and the case 511 are all made of thermoplastic resin, but since the resin materials are different from each other, they may be made by integral molding by injection molding called two-color molding. Many. The case 511 is formed of a conductive resin obtained by adding carbon to ABS or the like. A case 511 formed of this conductive resin is press-fitted into the light-shielding resin body 507 to be brought into contact with a GND (ground) portion 501A of the lead frame 501. This prevents the optical distance measuring sensor from being affected by external electromagnetic noise.

  Patent Document 2 (Japanese Patent Laid-Open No. 2011-43433) discloses an optical distance measuring sensor. As shown in FIG. 5A, which is a top view, and FIG. 5B, which is a cross-sectional view taken along the line AA of FIG. 5A, the optical distance measuring sensor of the second conventional example, An element 602, a light receiving element 609 that detects a light spot position, and a signal processing unit 610 that processes a light reception signal output from the light receiving element 609. Further, the light emitting element 602, the light receiving element 609, and the signal processing unit 610 are disposed on the substrate 608, the light emitting element 602 is sealed with a translucent resin body 611, and the light receiving element 609 and the signal processing unit 610 are provided. It is sealed with a translucent resin body 612. Further, a light-shielding resin body 613 is formed so as to cover the light-transmitting resin bodies 611 and 612 and the substrate 608. A metal lens plate 617 on which the light emitting side lens 615 and the light receiving side lens 616 are formed is fitted to the light shielding resin body 613 and the substrate 608.

  The light-shielding resin body 613 is provided in a region serving as a path for light incident on the light-receiving element 609 and a light-emitting side opening 613A provided in a region serving as a path for light emitted from the light-emitting element 602. And a light receiving side opening 613B. The lens plate 617 is fitted to the light shielding resin body 613 and the substrate 608 so that the light emitting side lens 615 faces the light emitting side opening 613A and the light receiving side lens 616 faces the light receiving side opening 613B. Has been attached.

JP 2010-48606 A JP 2011-43433 A

  By the way, in the optical distance measuring sensor of the first conventional example, the light emitting side lens 508 and the light receiving side lens 510 are made of a thermoplastic resin such as acrylic or polycarbonate, and the case 511 is made of a thermoplastic resin such as ABS. ing. For this reason, this optical distance measuring sensor has low heat resistance during mounting, and cannot be mounted by preheating (about 120 ° C., about 1 minute) or reflow (about 250 ° C.) during solder dipping.

  In the first conventional example, separately formed lenses 508 and 510 and a case 511 are fitted into a structure in which a light shielding resin body 507 is integrally formed with a lead frame 501 and a light transmitting resin body 505 and 506. It is a structure. For this reason, the thickness of the case 511 separately molded needs to be about 0.8 mm, and there is a problem that the size of the sensor becomes large.

  Further, in the first conventional example, since the lens has a structure in which the case 511 with an integrated lens is fitted to the structure, the internal structure of the lead frame 501, the translucent resin bodies 505 and 506, and the light-shielding resin body 507 is used. The positional relationship between the structural body and the lens-integrated case 511 is not securely fixed. For this reason, after the product is tested in the production process, a relative deviation occurs between the light emitting element 502 and the light receiving element 503, which are internal structures, and the light emitting side lens 508 and the light receiving side lens 510, thereby varying the product characteristics. It was happening.

  Furthermore, the first conventional example has a high manufacturing cost in terms of cost because there is a manual process of fitting a separately molded lens-integrated case 511 to the internal structure.

  On the other hand, in the optical distance measuring sensor of the second conventional example, since the lens plate 617 is made of metal, a case made of a conductive resin containing carbon as in the first conventional example is used. Compared with heat resistance, it can improve.

  However, in the second conventional example, the metal lens plate 617, the light-shielding resin body 613, and the light-transmitting resin bodies 611 and 612, which are package components, are caused by thermal expansion and contraction that occurs when the temperature returns to room temperature. There is a problem that the relative position change occurs between the internal devices (light emitting element, light receiving element) and the lens unit after the test, and the product characteristics vary.

  Accordingly, an object of the present invention is to prevent the positional displacement between the constituent members due to the expansion during heating and the contraction during cooling, to prevent variation in the distance measurement characteristics, and to provide an optical with good distance measurement accuracy. It is to provide a distance measuring sensor.

In order to solve the above problems, an optical distance measuring sensor of the present invention includes a light emitting element,
A light receiving element capable of detecting a spot position of incident light;
A signal processing unit for processing a signal output from the light receiving element;
A lead frame on which the light emitting element, the light receiving element, and the signal processing unit are mounted;
A first translucent resin portion for sealing the light emitting element;
A second translucent resin portion for sealing the light receiving element;
The light-transmitting side opening that exposes the window of the first light-transmitting resin portion and the light-receiving-side opening that exposes the window of the second light-transmitting resin portion and the first and second transparent portions are provided. A first light-shielding mold resin portion integrally molded with a light-shielding resin so as to cover the light-sensitive resin portion;
A light-emitting side lens on which light from the light-emitting element is incident;
A light receiving side lens for guiding incident light to the light receiving element;
The first light-shielding mold resin is mounted so that the light-emitting side lens and the light-receiving side lens are attached, and the light-emitting side lens is located in the light-emitting side opening and the light-receiving side lens is located in the light-receiving side opening. A metal lens plate attached to the part,
A second light-shielding mold resin portion integrally formed with the light-shielding resin so as to cover the first light-shielding mold resin portion,
The metal lens plate is
An upper part placed on the upper surface of the first light-shielding mold resin part;
A first side portion that covers the first side surface of both side surfaces of the first light-shielding mold resin portion that is continuous with the upper portion and extends in an arrangement direction in which the light receiving element and the light emitting element are arranged. When,
A second side portion continuous with the upper portion and covering a second side surface of the both side surfaces of the first light-shielding mold resin portion and continuous with the upper portion;
The second light-shielding mold resin portion is
An upper part covering the upper part of the lens plate;
A first side covering the first side of the lens plate;
A second side covering the second side of the lens plate;
It is characterized by detecting the distance to an object by a triangulation method.

  According to the optical distance measuring sensor of the present invention, the first and second light-transmitting resin portions for sealing the light-emitting element and the light-receiving element are covered with the first light-shielding mold resin portion. The upper surface and both side surfaces of the light-shielding mold resin portion are covered with the upper portion of the metal lens plate and the first and second side portions. Accordingly, the metal lens plate is arranged with respect to the first light-shielding mold resin portion with a structure in which both side surfaces of the first light-shielding mold resin portion are sandwiched between both sides of the metal lens plate. It is possible to prevent displacement in the direction intersecting the direction.

  Further, the upper part and the first and second side parts of the metallic lens plate are covered with the upper part and the first and second side parts of the second light-shielding mold resin part. Therefore, the second light-shielding mold resin portion can prevent the metal lens plate from being displaced in the direction intersecting the arrangement direction with respect to the first light-shielding mold resin portion.

  As described above, the metal lens plate has a structure in which both side surfaces of the first light-shielding mold resin portion are sandwiched between both side portions of the metal lens plate, and the metal lens plate is opposed to the first light-shielding mold resin portion. The metal lens plate can be prevented from being displaced in a direction intersecting the arrangement direction, and the metal lens plate covers the both sides of the metal lens plate by the second light-shielding mold resin portion. It is possible to prevent the light-shielding mold resin portion from being displaced in the direction intersecting the arrangement direction. Therefore, according to the present invention, the metal lens is used for the light emitting element and the light receiving element sealed with the first and second light-transmitting resin portions by expansion and contraction during heating and cooling. It is possible to prevent the light-emitting side lens and the light-receiving side lens provided on the plate from being displaced, to prevent variation in distance measurement characteristics, and to improve distance measurement accuracy.

In the optical distance measuring sensor of one embodiment, the second light-shielding mold resin portion is
A first end surface portion covering the first end surface portion of the first light-shielding mold resin portion in the arrangement direction and covering the first end portion of the lens plate in the arrangement direction;
And a second end surface portion covering the second end surface portion of the first light-shielding mold resin portion in the arrangement direction and covering the second end portion of the lens plate in the arrangement direction.

  According to the optical distance measuring sensor of this embodiment, the upper part and the first and second sides of the metallic lens plate at the upper part and the first and second side parts of the second light-shielding mold resin part. The first and second end surface portions of the second light-shielding mold resin portion are arranged in the direction in which the first and second end surface portions of the first light-shielding mold resin portion and the lens plate are arranged. Covers both ends. Therefore, the second light-shielding mold resin portion prevents the metal lens plate from being displaced with respect to the first light-shielding mold resin portion in the arrangement direction and the direction crossing the arrangement direction. it can.

In the optical distance measuring sensor of one embodiment, the metal lens plate is
A rectangular top,
Four through holes formed in the four corners of the upper part of the quadrangular shape;
Through holes formed in at least two locations on the first side of the lens plate;
Through holes formed in at least two places on the second side of the lens plate,
The first light-shielding mold resin portion is
Four holes having a predetermined depth and formed on the upper surface at positions corresponding to the four through holes in the upper part of the lens plate;
At least two holes having a predetermined depth and formed in the first side surface at positions corresponding to the through holes in the first side portion of the lens plate;
The second side surface is formed at a position corresponding to the through hole of the second side portion of the lens plate and has at least two holes of a predetermined depth,
The upper part of the second light-shielding mold resin part is
Having four protrusions protruding so as to fit into the four holes formed in the upper surface of the first light-shielding mold resin portion and fit into the four through holes in the upper portion of the lens plate;
The first side portion of the second light-shielding mold resin portion is:
At least two convex portions protruding so as to be fitted into the through holes in the first side portion of the lens plate and to be fitted into at least two holes on the first side surface of the first light-shielding mold resin portion. Have
The second side portion of the second light-shielding mold resin portion is
At least two convex portions protruding so as to be fitted into the through holes in the second side portion of the lens plate and to be fitted into at least two holes on the second side surface of the first light-shielding mold resin portion. Have.

  According to this embodiment, the upper four convex portions of the second light-shielding mold resin portion are fitted into the four through holes in the upper portion of the lens plate, and the upper surface of the first light-shielding mold resin portion. And at least two convex portions on the first and second side portions of the second light-shielding mold resin portion are the first and second projections of the lens plate. The first light-shielding mold resin part is fitted into at least two holes on the first and second side surfaces while being fitted into the through hole in the side part.

  As a result, the second light-shielding mold resin portion can more firmly fix the metal lens plate to the first light-shielding mold resin portion. Therefore, the light-emitting side lens provided on the metal lens plate In addition, it is possible to more reliably prevent the light receiving side lens from being displaced with respect to the light emitting element and the light receiving element.

Moreover, in the optical distance measuring sensor of one embodiment, through holes are formed at three locations on the first side portion of the lens plate,
Through holes are formed at three locations on the second side of the lens plate,
The first light-shielding mold resin portion is
Three holes formed in the first side surface at positions corresponding to the three through holes of the first side portion of the lens plate and having a predetermined depth;
The second side surface is formed at a position corresponding to the three through holes on the second side portion of the lens plate, and has three holes of a predetermined depth,
The first side portion of the second light-shielding mold resin portion is:
Three protrusions projecting so as to fit into the three through holes in the first side portion of the lens plate and to fit into the three holes in the first side surface of the first light-shielding mold resin portion. Have
The second side portion of the second light-shielding mold resin portion is
Three protrusions protruding so as to fit into the three through holes on the second side portion of the lens plate and to fit into the three holes on the second side surface of the first light-shielding mold resin portion Have.

  According to this embodiment, the three convex portions on the first and second side portions of the second light-shielding mold resin portion are fitted in the through holes on the first and second side portions of the lens plate. At the same time, it is fitted into three holes on the first and second side surfaces of the first light-shielding mold resin portion. Accordingly, the second light-shielding mold resin portion can more firmly fix the metal lens plate to the first light-shielding mold resin portion.

In the optical distance measuring sensor of one embodiment, the first light-shielding mold resin portion is
Having an intermediate wall between the light emitting side opening and the light receiving side opening;
Of the three holes formed on the first side surface of the first light-shielding mold resin portion, a central hole between two holes at both ends in the arrangement direction passes through the intermediate wall portion, Of the three holes formed in the second side surface of the first light-shielding mold resin portion, the hole reaches the center hole between the two holes at both ends in the arrangement direction.

  According to this embodiment, since the central hole of the first and second side surfaces penetrates the intermediate wall portion of the first light-shielding mold resin portion, the intermediate wall portion can be thinned. Due to this thinning, the first light-shielding mold resin part is prevented from being deformed by heat or moisture absorption by preventing the middle wall part from generating a cavity due to the shrinkage of the resin at the time of molding the resin. It is possible to stabilize the characteristics.

In the optical distance measuring sensor of one embodiment, the first light-shielding mold resin portion is
A first notch formed in a first corner between the upper surface and the first side surface;
A second notch formed at a second corner between the upper surface and the second side surface;

  According to this embodiment, since the first and second cutouts are formed in the first and second corners of the first light-shielding mold resin portion, the second light-shielding mold resin portion At the time of resin molding, the resin easily flows into the first and second cutouts, and the first and second cutouts can be filled with the resin. Thereby, the factor which makes the deformation | transformation of a package non-uniform | heterogenous by a heat | fever and moisture absorption reduces, the relative position shift of a structural member is suppressed, and a sensor with good ranging accuracy is realizable.

  When there is no notch, there is a slight space where the resin does not flow easily between the first and second corners of the first light-shielding mold resin portion and the metal lens plate. If this space remains as a gap, the deformation of the package due to heat and moisture absorption becomes non-uniform, which adversely affects the sensor characteristics.

  In one embodiment of the optical distance measuring sensor, at least one of the first light-shielding mold resin portion and the second light-shielding mold resin portion is made of a liquid crystal polymer. Yes.

  According to this embodiment, since the first and second light-shielding mold resin portions are made of a liquid crystal polymer, high heat resistance and a small linear expansion coefficient can be realized, and hygroscopicity is also higher than that of PPA (polyphthalamide). A small light-shielding mold resin part can be realized, and a sensor with good distance measurement accuracy can be realized.

  Moreover, in the electronic apparatus of the present invention, by mounting the optical distance measuring sensor of the present invention, it is possible to maintain stable distance measuring characteristics even when the environmental temperature changes, and to achieve a desired function based on accurate distance measuring. Can be achieved.

  According to the optical distance measuring sensor of the present invention, the metal lens plate has the structure in which both side surfaces of the first light-shielding mold resin portion are sandwiched between both side portions of the metal lens plate, and the metal lens plate has the first light-shielding property. It is possible to prevent the metallic mold resin portion from being displaced in a direction crossing the arrangement direction, and the second light-shielding mold resin portion covers both side portions of the metal lens plate and the metal. It is possible to prevent the manufactured lens plate from being displaced in the direction intersecting the arrangement direction with respect to the first light-shielding mold resin portion. Therefore, according to the present invention, the metal lens is used for the light emitting element and the light receiving element sealed with the first and second light-transmitting resin portions by expansion and contraction during heating and cooling. It is possible to prevent the light-emitting side lens and the light-receiving side lens provided on the plate from being displaced, to prevent variation in distance measurement characteristics, and to improve distance measurement accuracy.

It is a top view of an embodiment of an optical distance measuring sensor of the present invention. It is a side view of the said embodiment. It is BB sectional drawing of FIG. 1A. It is AA sectional drawing of FIG. 1A. It is the elements on larger scale of FIG. 1D which show a mode that the notch was formed in the corner | angular part of the 1st light-shielding mold resin part of the said embodiment. It is a top view of what removed the 2nd light-shielding mold resin part and the lens board from the said embodiment. It is a side view of what removed the 2nd light-shielding mold resin part and the lens board from the said embodiment. It is BB sectional drawing of FIG. 2A. It is a top view of the lens plate of the embodiment. It is a side view of the said lens board. It is an end view of the lens plate. It is a top view of the optical ranging sensor of the 1st prior art example. It is AA sectional drawing of FIG. 4A. It is a top view of the optical ranging sensor of the 2nd prior art example. It is AA sectional drawing of FIG. 5A.

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

  FIG. 1A is a top view of an embodiment of an optical distance measuring sensor according to the present invention, FIG. 1B is a side view of the above embodiment, FIG. 1C is a cross-sectional view along BB in FIG. 1A, and FIG. It is AA sectional drawing of FIG. 1A, FIG. 1E is the elements on larger scale of the corner | angular part of the 1st light-shielding mold resin part in which the notch was formed. FIG. 2A is a top view of the second embodiment from which the second light-shielding mold resin portion and the lens plate are removed, and FIG. 2B shows the second light-shielding mold resin portion and the lens plate from the embodiment. FIG. 2C is a cross-sectional view taken along the line BB of FIG. 2A.

  The optical distance measuring sensor of this embodiment includes a light emitting element 1, a CMOS image sensor 2 that constitutes a light receiving element and a signal processing unit, and a lead frame 3 on which the light emitting element 1 and the CMOS image sensor 2 are mounted.

  The light emitting element 1 is, for example, an infrared light emitting diode or an infrared surface emitting laser. In addition, the CMOS image sensor 2 includes, for example, a circuit for driving the light emitting element 1 at a desired timing, a memory unit, and the like in the same chip as the image sensor. The lead frame 3 is made of 42 alloy as an example.

  As shown in FIG. 1C, the light emitting element 1 is sealed with a first light transmissive resin portion 5 made of a light transmissive resin, and the CMOS image sensor 2 is made of a light transmissive resin. Sealed with the second translucent resin portion 6. The first and second translucent resin portions 5 and 6 form a primary mold portion. The first light-shielding mold resin portion 7 is integrally formed with the light-shielding resin so as to cover the first and second light-transmissive resin portions 5 and 6. The first light-shielding mold resin portion 7 includes a light emitting side opening portion 8 that exposes the window portion 5A of the first light-transmitting resin portion 5 and a window portion 6A of the second light-transmitting resin portion 6. And a light receiving side opening 10 to be exposed. The first light-shielding mold resin portion 7 is made of a highly heat-resistant light-shielding thermoplastic resin, and is integrally molded with, for example, polyphenylene sulfide (PPS) or polyphthalamide (PPA) containing about 40% glass fiber. (Secondary molding). As shown in FIGS. 2A to 2C, the first light-shielding mold resin portion 7 has a projection 7G for positioning when a lens plate 15 described later is covered.

  As shown in FIG. 2A, the lead frame 3 has a plurality of connection terminals 3A to the outside, and the connection terminals 3A protrude from the first light-shielding mold resin portion 7. Further, as shown in FIG. 2C, in the lead frame 3, one terminal 3 </ b> B connected to a GND (ground) terminal protrudes from the first light-shielding mold resin portion 7. The lead frame 3 may not have the terminal 3B.

  A metal lens plate 15 is placed on the upper surface 7A of the first light-shielding mold resin portion 7. A light-emitting side lens 16 and a light-receiving side lens 18 are attached to the metal lens plate 15. The lens plate 15 is formed on the first light-shielding mold resin portion 7 so that the light-emitting side lens 16 is located in the light-emitting side opening 8 and the light-receiving side lens 18 is located in the light-receiving side opening 10. It is attached.

  3A is a top view of the lens plate 15, FIG. 3B is a side view of the lens plate 15, and FIG. 3C is an end view of the lens plate 15. The lens plate 15 has a metal frame shape, and is formed with a hole 20 for outgoing light and a hole 22 for incident light. As an example, the lens plate 15 is made of the same 42 alloy as the lead frame 3. The metal frame-shaped lens plate 15 is inserted into a mold, and the light-emitting side lens 16 and the light-receiving side lens 18 are molded with a thermosetting resin (for example, epoxy resin).

  As shown in FIG. 1D, the metal lens plate 15 has an upper portion 15 </ b> A placed on the upper surface 7 </ b> A of the first light-shielding mold resin portion 7. The metallic lens plate 15 has first and second side portions 15B and 15C that are continuous with the upper portion 15A. The first side portion 15B covers the first side surface 7B of the first light-shielding mold resin portion 7. The second side portion 15 </ b> C covers the second side surface 7 </ b> C of the first light-shielding mold resin portion 7. The first and second side surfaces 7B and 7C of the first light-shielding mold resin portion 7 extend in the arrangement direction in which the CMOS image sensor 2 and the light emitting element 1 are arranged.

  Further, in this embodiment, as shown in FIGS. 1A to 1C, a second light-shielding mold resin portion 21 integrally formed with a light-shielding resin so as to cover the first light-shielding mold resin portion 7 is provided. Prepare. As shown in FIG. 1C, the second light shielding mold resin portion 21 has a light emitting side opening 31 in which the light emitting side lens 16 is disposed and a light receiving side opening 32 in which the light receiving side lens 18 is disposed. The second light-shielding mold resin portion 21 was covered with the first light-shielding mold resin portion 7 after the lens plate 15 was covered, and then sealed and molded (third mold) with a high heat-resistant light-shielding thermoplastic resin. Is. Here, the material of the second light-shielding mold resin portion 21 is the same as that of the first light-shielding mold resin portion 7, the expansion and contraction characteristics with respect to both heat are made equal, and the package is not uniform due to temperature changes. It is desirable to prevent deformation.

  Further, as shown in FIG. 1D, the second light-shielding mold resin portion 21 includes an upper portion 21A that covers the upper portion 15A of the lens plate 15 and a first side portion 15B that covers the first side portion 15B of the lens plate 15. It has a side portion 21B and a second side portion 21C that covers the second side portion 15C of the lens plate 15.

  Moreover, the said 2nd light-shielding mold resin part 21 has 1st end surface part 21D and 2nd end surface part 21E, as shown to FIG. 1C. The first end surface portion 21D covers the first end surface portion 7D of the first light-shielding mold resin portion 7 in the arrangement direction and covers the first end portion 15D of the lens plate 15 in the arrangement direction. . The second end surface portion 21 </ b> E covers the second end surface portion 7 </ b> E in the arrangement direction of the first light-shielding mold resin portion 7 and the second end portion 15 </ b> E in the arrangement direction of the lens plate 15. Cover.

  By using a conductive resin containing about 10 to 40% of carbon as the material of the second light-shielding mold resin portion 21, a part of the second light-shielding mold resin portion 21 is part of the lead frame 3. The structure is such that one terminal 3 </ b> B connected to the GND terminal is in contact with the inside of the package. As a result, the lens plate 15 and the second light-shielding mold resin portion 21 have an effect of shielding disturbance radio noise from the internal devices, so that the radio noise resistance of the sensor can be improved.

  Further, as shown in FIG. 3A, the upper portion 15A of the lens plate 15 has a quadrangular shape, and four through holes 35 to 38 are formed in the four corner portions 41 to 44, respectively. A positioning hole 15G that fits into the positioning protrusion 7G of the first light-shielding mold resin portion 7 is formed in the upper portion 15A of the lens plate 15.

  As shown in FIG. 3B, the first side portion 15B of the lens plate 15 has three through holes 46, 47, and 48 formed at both ends and the center portion in the arrangement direction. Further, in the second side portion 15C of the lens plate 15, three through holes (not shown) are arranged at positions facing the three through holes 46, 47, and 48 at both ends in the arrangement direction and the central portion. Is formed. The diameters of the through holes 35 to 38 and 46 to 48 are about 0.5 mm as an example.

  As shown in FIG. 2A, the first light-shielding mold resin portion 7 is formed with four holes 51, 52, 53, 54 having a predetermined depth (for example, 0.5 mm) on the upper surface 7A. Has been. These four holes 51, 52, 53, 54 are formed at the time of the secondary molding, and are formed at positions corresponding to the four through holes 35, 36, 37, 38 of the upper portion 15A of the lens plate 15. Further, as shown in FIG. 2B, the first light-shielding mold resin portion 7 has three holes 55, 56, 57 having a predetermined depth (for example, 0.5 mm) in the first side surface 7B. Is formed. The three holes 55, 56, 57 are formed at the time of the secondary molding, and are formed at positions corresponding to the three through holes 46, 47, 48 of the first side portion 15B of the lens plate 15. In the first light-shielding mold resin portion 7, three holes (not shown) having a predetermined depth are formed in the second side surface 7C. These three holes are formed at the time of the secondary molding, and are formed at positions corresponding to the three through holes (not shown) of the second side portion 15C of the lens plate 15. The diameter of each of the through holes 51 to 54, 55 to 57, etc. is, for example, about 0.5 mm.

  As shown in FIG. 1A, the upper portion 21A of the second light-shielding mold resin portion 21 has four convex portions 61, 62, 63, 64 formed during the sealing molding (tertiary molding). . The four convex portions 61, 62, 63, 64 are fitted into the four through holes 35, 36, 37, 38 of the upper portion 15A of the lens plate 15, and the upper surface 7A of the first light-shielding mold resin portion 7. It protrudes downward so as to fit into the four holes 51, 52, 53, 54 formed in.

  Further, as shown in FIG. 1B, the first side portion 21B of the second light-shielding mold resin portion 21 has three convex portions 65, 66, 67 formed during the sealing molding (tertiary molding). Have The three convex portions 65, 66, and 67 are fitted into the three through holes 46, 47, and 48 of the first side portion 15 </ b> B of the lens plate 15 and the first light-shielding mold resin portion 7. It protrudes inward in the side so as to fit into the three holes 55, 56, 57 of one side 7 </ b> B.

  The second side portion 21C of the second light-shielding mold resin portion 21 has three convex portions (not shown) at positions facing the three convex portions 65, 66, 67. These three convex portions are formed during the sealing molding (tertiary molding). The three convex portions are fitted into the three through holes (not shown) of the second side portion 15C of the lens plate 15, and are formed on the second side surface 7C of the first light-shielding mold resin portion 7. It protrudes to the inner side so as to fit in the three holes (not shown).

  As shown in FIG. 2C, the first light-shielding mold resin portion 7 has an intermediate wall portion 7 </ b> F between the light emitting side opening 8 and the light receiving side opening 10. A central hole 56 formed in the first side surface 7B of the first light-shielding mold resin portion 7 passes through the intermediate wall portion 7F, and the second hole of the first light-shielding mold resin portion 7 is formed. It reaches the central hole in the arrangement direction formed on the side surface 7C.

  Further, in this embodiment, as shown in FIGS. 1D and 1E, the first light-shielding mold resin portion 7 is formed on the first corner portion 71 between the upper surface 7A and the first side surface 7B. A first notch 73 is formed, and a second notch 74 is formed at a second corner 72 between the upper surface 7A and the second side surface 7C. As shown in FIG. 2A, the first and second notches 73 and 74 extend across both ends of the first and second side surfaces 7B and 7C in the arrangement direction.

  According to the optical distance measuring sensor having the above-described configuration, the light emitted from the light emitting element 1 is irradiated onto the object to be measured (not shown) through the light emitting side lens 16, and the light reflected by the object to be measured is received by the light receiving device. The light enters the CMOS image sensor 2 through the side lens 18. The CMOS image sensor 2 detects a spot position of incident light, and detects a distance to the object to be measured by a triangulation method based on the spot position.

  In the above embodiment, the first and second translucent resin portions 5 and 6 for sealing the light emitting element 1 and the CMOS image sensor 2 are covered with the first light-shielding mold resin portion 7, and this first The upper surface 7A and both side surfaces 7B, 7C of the light-shielding mold resin portion 7 are covered with the upper portion 15A of the metal lens plate 15 and the first and second side portions 15B, 15C. Therefore, the metal lens plate 15 has the structure in which both side surfaces 7B and 7C of the first light-shielding mold resin portion 7 are sandwiched between the both side portions 15B and 15C of the metal lens plate 15, and the metal lens plate 15 has the first light-shielding property. It is possible to prevent displacement of the conductive mold resin portion 7 in a direction crossing the arrangement direction.

  In this embodiment, the upper portion 21A of the second light-shielding mold resin portion 21 and the first and second side portions 21B and 21C are connected to the upper portion 15A of the metallic lens plate 15 and the first and second portions. The side portions 15B and 15C are covered, and the first and second end face portions 21D and 21E of the second light-shielding mold resin portion 21 are the first and second end portions of the first light-shielding mold resin portion 7, respectively. The end face portions 7D and 7E and the both end portions 15D and 15E of the lens plate 15 in the arrangement direction are covered. Therefore, the second light-shielding mold resin portion 21 causes the metal lens plate 15 to be displaced with respect to the first light-shielding mold resin portion 7 in the arrangement direction and the direction intersecting the arrangement direction. Can be prevented.

  Thus, the metal lens plate 15 has the structure in which both side surfaces 7B and 7C of the first light-shielding mold resin portion 7 are sandwiched between the both side portions 15B and 15C of the metal lens plate 15. The light-shielding mold resin portion 7 can be prevented from being displaced in a direction intersecting the arrangement direction, and the first light-shielding mold resin portion 7 can be prevented by the second light-shielding mold resin portion 21. The metal lens plate 15 covers the both side portions 15B, 15C and both end portions 15D, 15E of the metal lens plate 15, and the arrangement direction and the arrangement direction with respect to the first light-shielding mold resin portion 7. It is possible to prevent displacement in the direction intersecting with. Therefore, according to this embodiment, with respect to the light emitting element 1 and the CMOS image sensor 2 sealed with the first and second light-shielding mold resin portions 7 and 21 due to expansion and contraction during heating and cooling. Thus, it is possible to prevent the light-emitting side lens 16 and the light-receiving side lens 18 provided on the metal lens plate 15 from being displaced from each other, to prevent variation in the distance measurement characteristics, and to provide a distance measurement sensor with good distance measurement accuracy. realizable.

  Further, according to this embodiment, the four convex portions 61 to 64 of the upper portion 21A of the second light-shielding mold resin portion 21 are fitted into the four through holes 35 to 38 of the upper portion 15A of the lens plate 15. The first light-shielding mold resin portion 7 is fitted into the four holes 51 to 54 formed on the upper surface 7A. Further, the three convex portions 65 to 67 of the first and second side portions 21B and 21C of the second light-shielding mold resin portion 21 are the first and second side portions 15B and 15C of the lens plate 15, respectively. And the three holes 55 to 57 of the first and second side faces 7B and 7C of the first light-shielding mold resin portion 7.

  As a result, the second light-shielding mold resin portion 21 can fix the metal lens plate 15 to the first light-shielding mold resin portion 7 more firmly, and thus is provided on the metal lens plate 15. Further, it is possible to more reliably prevent the light emitting side lens 16 and the light receiving side lens 18 from being displaced with respect to the light emitting element 1 and the CMOS image sensor 2.

  Further, according to this embodiment, since the central hole 56 of the first and second side surfaces 7B and 7C passes through the intermediate wall portion 7F of the first light-shielding mold resin portion 7, the intermediate portion The wall 7F can be thinned. Due to this thinning, when the first light-shielding mold resin part 7 is resin-molded, the intermediate wall part 7F can be prevented from being deformed by shrinkage of the resin during molding, and deformation due to heat and moisture absorption can be prevented. The characteristics of the sensor can be stabilized.

  Further, according to this embodiment, the first and second cutouts 73 and 74 are formed in the first and second corner portions 71 and 72 of the first light-shielding mold resin portion 7. When the second light-shielding mold resin portion 21 is resin-molded, the resin easily flows into the first and second cutouts 73 and 74, and the first and second cutouts 73 and 74 are filled with resin. Can do. Thereby, the factor which makes the deformation | transformation of a package non-uniform | heterogenous by a heat | fever and moisture absorption reduces, the relative positional shift of a structural member is suppressed, and a sensor with a sufficient ranging accuracy is realizable.

  In the case where the notches 73 and 74 are not provided, the resin is provided between the first and second corner portions 71 and 72 of the first light-shielding mold resin portion 7 and the metal lens plate 15. If a small space that does not flow easily is formed and this space remains as a gap, the deformation of the package due to heat and moisture absorption may become uneven, and the sensor characteristics may be adversely affected.

  Further, as described above, the metal lens plate 15 is made of the same material as that of the lead frame 3 (for example, 42 alloy), so that the lens plate 15 can be attached to the lens plate 15 during reflow mounting or when the environmental temperature changes. The expansion or contraction dimension of the space between the light receiving and light emitting lenses 18 and 16 fixed and the space between the light receiving and light emitting elements fixed to the lead frame 3 are substantially the same. Thereby, the spot position irradiated to the light-receiving part of the CMOS image sensor 2 hardly changes due to temperature change, and a sensor with good distance measurement accuracy can be realized.

  Further, at least one of the resin material of the first light-shielding mold resin portion 7 by the secondary mold and the second light-shielding mold resin portion 21 by the tertiary mold has a high heat resistance, a low linear expansion coefficient, and a high moisture absorption rate. By using a liquid crystal polymer smaller than PPA (polyphthalamide), deformation of the package due to heat and moisture absorption can be suppressed, and a sensor with better distance measurement accuracy can be realized.

  In the above embodiment, the number of holes formed in the first and second side surfaces 7B and 7C of the first light-shielding mold resin portion 7 and the first and second side portions 15B and 15C of the lens plate 15 are defined. The number of through holes to be formed and the number of convex portions to be formed on the first and second side portions 21B and 21C of the second light-shielding mold resin portion 21 are three. The number may be two or four. Further, the hole, the through hole, and the convex portion are not necessarily formed. Further, holes 51 to 54 on the upper surface 7A of the first light-shielding mold resin portion 7; four through holes 35 to 38 in the upper portion 15A of the lens plate 15; and an upper portion 21A of the second light-shielding mold resin portion 21. The four convex portions 61 to 64 are not necessarily formed. Further, the central hole 56 of the first light-shielding mold resin portion 7 does not necessarily have to penetrate the intermediate wall portion 7F. Further, the first and second cutouts 73 and 74 of the first light-shielding mold resin portion 7 are not necessarily formed.

  In addition, when the optical distance measuring sensor is mounted on a camera-equipped mobile phone, the optical distance measuring sensor can measure the distance to the subject, and the camera focus can be adjusted automatically and at high speed. Accurate alignment (autofocus) function can be realized at low cost. Further, when the optical distance measuring sensor is mounted on a personal computer, the optical distance measuring sensor can accurately detect whether a person is in front of the personal computer. When you are away, you can save energy efficiently and cheaply by putting your personal computer in sleep mode.

  The optical distance measuring sensor is not limited to a personal computer and a camera-equipped mobile phone, and may be mounted on other electronic devices that require optical distance measurement results.

DESCRIPTION OF SYMBOLS 1 Light emitting element 2 CMOS image sensor 3 Lead frame 3A Connection terminal 3B Terminal 5 1st translucent resin part 5A Window part 6 2nd translucent resin part 6A Window part 7 1st light-shielding mold resin part 7A Upper surface 7B 1st side surface 7C 2nd side surface 7D 1st end surface part 7E 2nd end surface part 7F Intermediate wall part 7G Positioning protrusion 8 Light emission side opening part 10 Light reception side opening part 15 Metal lens plate 15A Upper part 15B First 1 side portion 15C second side portion 15G positioning hole 16 light emitting side lens 18 light receiving side lens 20 outgoing light hole 22 incident light hole 21 second light shielding mold resin portion 21A upper portion 21B first Side part 21C Second side part 21D First end face part 21E Second end face part 35-38, 46-48, Through hole 41-44 Corner part 51-54, 55-57 Hole 61-67 Convex part 71 First 1 corner 72 second Corner 73 first notch 74 second notch

Claims (8)

A light emitting element;
A light receiving element capable of detecting a spot position of incident light;
A signal processing unit for processing a signal output from the light receiving element;
A lead frame on which the light emitting element, the light receiving element, and the signal processing unit are mounted;
A first translucent resin portion for sealing the light emitting element;
A second translucent resin portion for sealing the light receiving element;
The light-transmitting side opening that exposes the window of the first light-transmitting resin portion and the light-receiving-side opening that exposes the window of the second light-transmitting resin portion and the first and second transparent portions are provided. A first light-shielding mold resin portion integrally molded with a light-shielding resin so as to cover the light-sensitive resin portion;
A light-emitting side lens on which light from the light-emitting element is incident;
A light receiving side lens for guiding incident light to the light receiving element;
The first light-shielding mold resin is mounted so that the light-emitting side lens and the light-receiving side lens are attached, and the light-emitting side lens is located in the light-emitting side opening and the light-receiving side lens is located in the light-receiving side opening. A metal lens plate attached to the part,
A second light-shielding mold resin portion integrally formed with the light-shielding resin so as to cover the first light-shielding mold resin portion,
The metal lens plate is
An upper part placed on the upper surface of the first light-shielding mold resin part;
A first side portion that covers the first side surface of both side surfaces of the first light-shielding mold resin portion that is continuous with the upper portion and extends in an arrangement direction in which the light receiving element and the light emitting element are arranged. When,
A second side portion continuous with the upper portion and covering a second side surface of the both side surfaces of the first light-shielding mold resin portion and continuous with the upper portion;
The second light-shielding mold resin portion is
An upper part covering the upper part of the lens plate;
A first side covering the first side of the lens plate;
A second side covering the second side of the lens plate;
An optical distance measuring sensor that detects a distance to an object by a triangulation method. The optical distance measuring sensor according to claim 1,
The second light-shielding mold resin portion is
A first end surface portion covering the first end surface portion of the first light-shielding mold resin portion in the arrangement direction and covering the first end portion of the lens plate in the arrangement direction;
And a second end surface portion that covers the second end surface portion of the first light-shielding mold resin portion in the arrangement direction and covers the second end portion of the lens plate in the arrangement direction. Optical distance measuring sensor. The optical distance measuring sensor according to claim 1 or 2,
The metal lens plate is
A rectangular top,
Four through holes formed in the four corners of the upper part of the quadrangular shape;
Through holes formed in at least two locations on the first side of the lens plate;
Through holes formed in at least two places on the second side of the lens plate,
The first light-shielding mold resin portion is
Four holes having a predetermined depth and formed on the upper surface at positions corresponding to the four through holes in the upper part of the lens plate;
At least two holes having a predetermined depth and formed in the first side surface at positions corresponding to the through holes in the first side portion of the lens plate;
The second side surface is formed at a position corresponding to the through hole of the second side portion of the lens plate and has at least two holes of a predetermined depth,
The upper part of the second light-shielding mold resin part is
Having four protrusions protruding so as to fit into the four holes formed in the upper surface of the first light-shielding mold resin portion and fit into the four through holes in the upper portion of the lens plate;
The first side portion of the second light-shielding mold resin portion is:
At least two convex portions protruding so as to be fitted into the through holes in the first side portion of the lens plate and to be fitted into at least two holes on the first side surface of the first light-shielding mold resin portion. Have
The second side portion of the second light-shielding mold resin portion is
At least two convex portions protruding so as to be fitted into the through holes in the second side portion of the lens plate and to be fitted into at least two holes on the second side surface of the first light-shielding mold resin portion. An optical distance measuring sensor comprising: The optical distance measuring sensor according to claim 3,
Through holes are formed at three locations on the first side of the lens plate,
Through holes are formed at three locations on the second side of the lens plate,
The first light-shielding mold resin portion is
Three holes formed in the first side surface at positions corresponding to the three through holes of the first side portion of the lens plate and having a predetermined depth;
The second side surface is formed at a position corresponding to the three through holes on the second side portion of the lens plate, and has three holes of a predetermined depth,
The first side portion of the second light-shielding mold resin portion is:
Three protrusions projecting so as to fit into the three through holes in the first side portion of the lens plate and to fit into the three holes in the first side surface of the first light-shielding mold resin portion. Have
The second side portion of the second light-shielding mold resin portion is
Three protrusions protruding so as to fit into the three through holes on the second side portion of the lens plate and to fit into the three holes on the second side surface of the first light-shielding mold resin portion An optical distance measuring sensor comprising: The optical distance measuring sensor according to claim 4,
The first light-shielding mold resin portion is
Having an intermediate wall between the light emitting side opening and the light receiving side opening;
Of the three holes formed on the first side surface of the first light-shielding mold resin portion, a central hole between two holes at both ends in the arrangement direction passes through the intermediate wall portion, An optical system characterized by reaching a central hole between two holes at both ends in the arrangement direction among the three holes formed in the second side surface of the first light-shielding mold resin portion. Ranging sensor. The optical distance measuring sensor according to any one of claims 1 to 5,
The first light-shielding mold resin portion is
A first notch formed in a first corner between the upper surface and the first side surface;
An optical distance measuring sensor having a second notch formed at a second corner between the upper surface and the second side surface. The optical distance measuring sensor according to any one of claims 1 to 6,
An optical distance measuring sensor, wherein at least one of the first light-shielding mold resin portion and the second light-shielding mold resin portion is made of a liquid crystal polymer.   An electronic device equipped with the optical distance measuring sensor according to claim 1.

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