JP2013187357A - Reflection light sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem that, even when a groove defined by two side surfaces vertical to a luminous surface is formed between a light-emitting element and a light-receiving element, the amount of light directly incident on the light-receiving element through a resin layer among the light emitted from the light-emitting element is still large, and that, therefore, the S/N ratio of a reflection light sensor is small.SOLUTION: A light-emitting element 1 and a light-receiving element 2 are mounted on a wiring board 3, which are further encapsulated by a light permeable (visible rays cut) resin layer 4. An ∠-shaped groove 5 is formed whose side surface S1 on the light-emitting element 1 side is perpendicular to a luminous surface and whose side surface S2' of the light-receiving element 2 side is inclined to the light-receiving element 2 side relative to the luminous surface. The incident angle relative to the side surface S2' of light L1 from the light-emitting element 1 passing through the vertical side surface S1 and arriving at the side surface S2' via the air (groove 5) increases. As a result, the amount of light L1 reflected at the side surface S2' becomes large, which results in the amount of light entering the light-receiving element 2 directly from the light-emitting element 1 being reduced. Thus, the S/N ratio of a reflection light sensor can be improved.

Description

  The present invention relates to a surface mount type reflected light sensor.

  In general, a reflected light sensor includes a light emitting element and a light receiving element, irradiates a detected object with light emitted from the light emitting element, and receives the reflected light by the light receiving element, thereby detecting the presence or absence of the detected object.

  14A and 14B show a conventional reflected light sensor, where FIG. 14A is a top view and FIG. 14B is a cross-sectional view taken along the line BB of FIG. In FIG. 14, the light-emitting element 101 and the light-receiving element 102 are sealed with a light-transmitting resin layer 103, and both side surfaces S1 and S2 are formed on the resin layer 103 between the light-emitting element 101 and the light-receiving element 102 with respect to the light-emitting surface. Is provided with a vertical groove 104 (see: FIG. 4 of Patent Document 1 and FIG. 1 of Patent Document 2). This prevents light emitted from the light emitting element 101 from directly entering the light receiving element 102 through the resin layer 103, thereby improving the signal / noise (S / N) ratio of the reflected light sensor. Reference numerals 103 a and 103 b denote lenses for the light emitting element 101 and the light receiving element 102 formed by the resin layer 103.

JP 59-56779 A Japanese Patent Laid-Open No. 62-132377

  However, in the above-described conventional reflected light sensor, the amount of light directly incident on the light receiving element 102 through the resin layer 103 and the groove 104 out of the light emitted from the light emitting element 101 is still large, and accordingly, the S / N ratio of the light sensor. There was still the problem of being small.

  That is, in general, on the side surfaces S1 and S2 where the refractive index changes, light is refracted and reflected according to Snell's law of refraction and reflection. At this time, the reflection of light increases as the incident angles θ11 and θ12; θ21 and θ22 increase. While the amount increases, the amount of light refraction decreases. On the side surface S1, light is totally reflected only when the incident angle is equal to or greater than the critical angle.

  Accordingly, in FIGS. 14A and 14B, light L1 and L2 that have obliquely reached the side surface S1 from the light emitting element 101 through the resin layer 103 are reflected by the side surface S1, and the amount of reflection is incident on the side surface S1. The amount of light L1 and L2 is refracted at the side surface S1 and transmitted through the air (groove 104) and reaches the side surface S2 obliquely on the side surface S2. The amount of reflection is an amount corresponding to the incident angles θ12 and θ22 with respect to the side surface S2. Therefore, the light quantity of the light L1 and L2 that is refracted at the side surface S2 and enters the resin layer 103 again becomes small. However, the light L3 that reaches the side surface S1 at right angles from the light emitting element 101 in FIG. 14A through the resin layer 103 has an incident angle of about 0 ° with respect to the side surface S1, so that almost all the light amount of the light L3 is on the side surface. In S1, the light is refracted and passes through the air (groove 104) to reach the side surface S2. Also at this time, since the incident angle of the light L3 with respect to the side surface S2 is substantially 0 °, almost the entire light amount of the light L3 is refracted by the side surface S2 and enters the resin layer 103 again. The entry of the light L3 becomes a problem in terms of the S / N ratio. In this way, even if the groove portion 104 formed of the side surfaces S1 and S2 is provided between the light emitting element 101 and the light receiving element 102 with respect to the light emitting surface, the light that has entered the resin layer 103 again on the inner wall of the resin layer 103. The decrease in the amount of light reflected and directly incident on the light receiving element 102 from the light emitting element 101 is still small, and thus the S / N ratio of the reflected light sensor is still small.

  In order to solve the above-described problems, a reflected light sensor according to the present invention includes a light emitting element and a light receiving element formed on a substrate, and a reflective resin layer that seals the light emitting element and the light receiving element. In the optical sensor, the light-transmitting resin layer has a groove formed between the light emitting element and the light receiving element, and has a first surface facing the light emitting element constituting the groove and a second surface facing the light receiving element. At least one of the surfaces is characterized in that in the cross section of the groove portion, the surface is inclined toward the light receiving element side so that the distance from the light emitting element increases toward the upper side of the groove portion. Thereby, the incident angle with respect to this inclined surface of the light which reached the inclined surface from the light emitting element becomes large.

  Further, at least one of the first surface and the second surface described above is inclined with respect to a surface perpendicular to a line connecting the center of the light emitting element and the center of the light receiving element when viewed from above the groove. An inclined region is formed. The inclined region is formed to be curved so as to protrude from the light receiving element toward the light emitting element when viewed from above the groove. Alternatively, the inclined region is formed as two surfaces protruding from the light receiving element toward the light emitting element when viewed from above the groove. Alternatively, the inclined region is formed as a plane that obliquely intersects with a line connecting the center of the light emitting element and the center of the light receiving element when viewed from above the groove.

  Further, the light emitting element and the light receiving element described above are mounted on the substrate so that one side surface of the light emitting element and one side surface of the light receiving element face each other, and the light emitting element and the light receiving element are provided on at least one of the first surface and the second surface. Is formed with an inclined region that is inclined with respect to the side surface of the light emitting element facing the light receiving element when viewed from above. The inclined region is formed as an inclined curved surface that protrudes from the light receiving element toward the light emitting element when viewed from above the groove. Alternatively, the inclined region is formed as two inclined surfaces that protrude from the light receiving element toward the light emitting element when viewed from above the groove. Alternatively, the inclined region is formed as an inclined surface that obliquely intersects with a line connecting the center of the light emitting element and the center of the light receiving element when viewed from above the groove.

  Further, the above-described inclined region is formed in a partial region intersecting with a line connecting the center of the light emitting element and the center of the light receiving element when viewed from above the groove. In this case, the groove portion is inclined with respect to this line in a partial region intersecting with a line connecting the center of the light emitting element and the center of the light receiving element when viewed from above the substrate, and the groove portion extends to this line in a region outside the partial region. It is perpendicular to it.

  According to the present invention, since the incident angle with respect to at least one of the first and second surfaces constituting the groove portion of the light from the light emitting element is increased, reflection on at least one of the first and second surfaces is performed. The amount of light increases, and as a result, the amount of light directly incident on the light receiving element from the light emitting element decreases, and therefore the S / N ratio of reflected light can be improved.

1A and 1B show a first embodiment of a reflected light sensor according to the present invention, in which FIG. 3A is a perspective view, FIG. 3B is a top view, and FIG. The 2nd Embodiment of the reflected light sensor which concerns on this invention is shown, (A) is a perspective view, (B) is a top view, (C) is CC sectional view taken on the line of (B). 3A and 3B show a third embodiment of a reflected light sensor according to the present invention, in which FIG. 3A is a perspective view, FIG. 3B is a top view, and FIG. 4A and 4B show a reflected light sensor according to a fourth embodiment of the present invention, in which FIG. 5A is a perspective view, FIG. 5B is a top view, and FIG. 5 shows a fifth embodiment of a reflected light sensor according to the present invention, (A) is a perspective view, (B) is a top view, and (C) is a sectional view taken along the line CC of (B). FIG. 6 shows a sixth embodiment of the reflected light sensor according to the present invention, wherein (A) is a perspective view, (B) is a top view, and (C) is a cross-sectional view taken along the line CC of (B). FIG. 7 shows a reflected light sensor according to a seventh embodiment of the present invention, in which (A) is a perspective view, (B) is a top view, and (C) is a sectional view taken along the line CC of (B). FIG. FIG. 8 shows an eighth embodiment of the reflected light sensor according to the present invention, in which (A) is a perspective view, (B) is a top view, and (C) is a sectional view taken along the line CC of (B). The 9th Embodiment of the reflected light sensor which concerns on this invention is shown, (A) is a perspective view, (B) is a top view, (C) is CC sectional view taken on the line of (B). The 10th Embodiment of the reflected light sensor which concerns on this invention is shown, (A) is a perspective view, (B) is a top view, (C) is CC sectional view taken on the line of (B). 11 shows an eleventh embodiment of a reflected light sensor according to the present invention, in which (A) is a perspective view, (B) is a top view, and (C) is a sectional view taken along the line CC of (B). FIG. The 12th Embodiment of the reflected light sensor which concerns on this invention is shown, (A) is a perspective view, (B) is a top view, (C) is CC sectional view taken on the line of (B). It is a top view which shows the example of a change of (B) of FIG. The conventional reflected light sensor is shown, (A) is a top view, (B) is the BB sectional drawing of (A).

  1A and 1B show a first embodiment of a reflected light sensor according to the present invention, in which FIG. 1A is a perspective view, FIG. 1B is a top view, and FIG. 1C is a sectional view taken along the line CC of FIG. .

  In FIG. 1, a light-emitting element 1 and a light-receiving element 2 are mounted on a wiring board 3, and further, a light-transmitting resin (a visible light cut is preferable when the light-emitting wavelength of the light-emitting element 1 is in the infrared region). Sealed with layer 4. Further, instead of the groove portion 104 in FIG. 14, the side surface S1 on the light emitting element 1 side is perpendicular to the upper surface of the light emitting element 1 (parallel to the side surface on the light receiving element 2 side of the light emitting element 1). S2 ′ is a cross-sectionally-shaped groove portion 5 which is an inclined surface inclined so that the distance from the side surface to the light receiving element 2 side of the light emitting element 1 on the light receiving element 2 side increases toward the upper side of the groove portion 5. Is provided. The groove portion 5 is formed between the light emitting element 1 and the light receiving element 2 of the resin layer 4 from the upper surface of the resin layer 4 toward the wiring substrate 3. The letter-shaped groove 5 may be formed by a mold when the resin layer 4 is transfer molded, or may be formed by laser processing after transfer molding. In the case of this laser processing, when the laser processed surface is blackened (carbonized), the light shielding property is increased, and therefore high power laser processing such as a carbon dioxide laser is suitable. The bottom of the groove 5 preferably reaches a position lower than the upper surface of the light emitting element 1, and preferably reaches a position lower than the upper surface of the light receiving element 2. Further, the groove 5 may reach the wiring board 3.

  In FIG. 1, the light emitting element 1 is an infrared light emitting diode (LED) element, the light receiving element 2 is a photodiode element, a phototransistor element, etc., and the wiring board 3 is based on a glass epoxy substrate or the like. A wiring pattern (not shown) for supplying power to the battery is formed. The resin layer 4 is made of an epoxy resin, a silicone resin, or the like. Reference numeral 6 denotes a light-shielding die attach material layer containing a light-shielding material such as carbon black, and 7 denotes a metal layer that covers the upper surface from the side surface of the light receiving element 2. The light-shielding die attach material layer 6 prevents stray light entering the resin layer 4 on the light receiving element 2 side and light entering the resin layer 4 deeper than the groove 5 from entering the light receiving element 2. The metal layer 7 is for shielding incident light from other than the upper surface of the light receiving element 2, and is useful for improving the S / N ratio. Note that the metal layer 7 is prevented from cracking by mesa-etching the shoulder portion of the light receiving element 2 forming the metal layer 7. Further, the electrodes of the light emitting element 1 and the light receiving element 2 and the wiring pattern of the wiring board 3 are connected by a bonding wire made of a wire such as gold, silver, or copper (not shown).

  As shown in FIG. 1C, the incident angle with respect to the side surface S2 ′ of the light L1 that has reached the side surface S2 ′ from the light emitting element 1 through the side surface S1 through the air (groove 5) is as shown in FIG. It becomes larger than the incident angle with respect to the side surface S2 of the light L1. Here, the light L1 passes through the side surface S1 on the light emitting element 1 side of the groove portion 5 from the light emitting element 1 and reaches the side surface S2 ′ on the light receiving element 2 side of the groove portion 5 and is parallel to the upper surface of the wiring board 3. The light emitted upward from the light emitting element 1 than the light is shown. As a result, the amount of reflected light on the side surface S2 ′ of the light L1 is larger than the amount of reflected light on the side surface S2 of the light L1 in FIG. 14B. As a result, the light directly incident on the light receiving element 2 from the light emitting element 1 The amount of light decreases, and therefore the S / N ratio of the reflected light sensor can be improved.

  2A and 2B show a second embodiment of a reflected light sensor according to the present invention, in which FIG. 2A is a perspective view, FIG. 2B is a top view, and FIG. 2C is a sectional view taken along the line CC of FIG. .

  In FIG. 2, instead of the groove 104 in FIG. 14, the side surface S1 ′ on the light emitting element 1 side is closer to the light receiving element 2 side than the side surface on the light receiving element 2 side of the light emitting element 1 (the light receiving element side of the light emitting element). The side surface S2 on the light receiving element 2 side is perpendicular to the upper surface of the light emitting element 1 (the light receiving element of the light emitting element 1). A cross-sectional groove-shaped groove portion 5 ′ that is parallel to the side surface on the second side is provided. The groove 5 ′ is formed between the light emitting element 1 and the light receiving element 2 of the resin layer 4 from the upper surface of the resin layer 4 toward the wiring substrate 3. The m-shaped groove 5 'is formed by laser processing after the resin layer 4 is transfer molded. In the case of this laser processing, when the laser processed surface is blackened (carbonized), the light shielding property is increased, and therefore high power laser processing such as a carbon dioxide laser is suitable.

  As shown in FIG. 2C, the incident angle of the light L1 reaching the side surface S1 'from the light emitting element 1 with respect to the side surface S1' is larger than the incident angle of the light L1 with respect to the side surface S1 in FIG. As a result, the amount of reflected light on the side surface S1 ′ of the light L1 becomes larger than the amount of reflected light on the side surface S1 of the light L1 in FIG. 14B, and as a result, the light L1 directly enters the light receiving element 2. The amount of light is reduced, and therefore the S / N ratio of the reflected light sensor can be improved.

  3A and 3B show a third embodiment of the reflected light sensor according to the present invention, in which FIG. 3A is a perspective view, FIG. 3B is a top view, and FIG. 3C is a sectional view taken along the line CC of FIG. .

  In FIG. 3, instead of the groove 104 in FIG. 14, the side surface S1 ′ on the light emitting element 1 side and the side surface S2 ′ on the light receiving element 2 side are both on the light receiving element 2 side with respect to the side surface on the light receiving element 2 side. A groove portion 5 ″ that is an inclined side surface is provided so that the distance from the side surface (the side surface of the light emitting element 1 on the light receiving element 2 side) increases toward the upper side of the groove portion 5 ″. The groove portion 5 ″ is formed between the light emitting element 1 and the light receiving element 2 of the resin layer 4 from the upper surface of the resin layer 4 toward the wiring substrate 3. The groove portion 5 ″ is formed by transfer molding the resin layer 4. In the case of laser processing, if the laser processing surface is blackened (carbonized), the light shielding property is increased. High power laser processing such as gas laser is suitable.

  As shown in FIG. 3C, the incident angle of the light L1 reaching the side surface S1 ′ from the light emitting element 1 with respect to the side surface S1 ′ is larger than the incident angle of the light L1 with respect to the side surface S1 in FIG. The incident angle of the light L1 that has reached the side surface S2 ′ through the side surface S1 ′ through the air (groove 5 ″) with respect to the side surface S2 ′ is also larger than the incident angle of the light L1 with respect to the side surface S2 in FIG. As a result, the amount of reflected light on the side surfaces S1 ′ and S2 ′ of the light L1 is greater than the amount of reflected light on the side surfaces S1 and S2 of the light L1 in FIG. The amount of light directly incident on 2 is reduced, so that the S / N ratio of the reflected light sensor can be improved.

  4A and 4B show a fourth embodiment of a reflected light sensor according to the present invention, in which FIG. 4A is a perspective view, FIG. 4B is a top view, and FIG. 4C is a cross-sectional view taken along the line CC of FIG. . The side surface S <b> 2 ′ of the fourth embodiment is formed so that the side surface S <b> 2 ′ of the reflected light sensor of the first embodiment has an R shape surrounding the light receiving element 2. The side surface S <b> 2 ′ is formed as a curved surface that projects from the light receiving element 2 side toward the light emitting element 1 side when observed from above the wiring board 3. In the present embodiment, the side surface S2 'is formed as a surface that is inclined with respect to the side surface of the light emitting element 1 on the light receiving element 2 side and the side surface S1 of the groove 5 on the light emitting element 1 side. The shape of the side surface S2 'of the groove 5 in the fourth embodiment can also be applied to the side surface S2 and the side surface S2' of the reflected light sensor of FIGS.

  As shown in FIG. 4B, the incident angle with respect to the side surface S2 ′ of the light L2 that has reached the side surface S2 ′ from the light emitting element 1 through the side surface S1 through the air (groove portion 5) is as shown in FIG. It becomes larger than the incident angle with respect to the side surface S2 of the light L2. Here, the light L2 passes through the side surface of the groove portion 5 from the light emitting element 1 on the light emitting element 1 side and reaches the side surface of the groove portion 5 on the light receiving element 2 side as viewed from above the resin layer 4 (upper surface). FIG. 4B shows light incident on a side surface S2 ′ that is incident on a region inclined with respect to a plane perpendicular to a line connecting the center of the light emitting element 1 and the center of the light receiving element 2. As a result, the amount of reflected light on the side surface S2 ′ of the light L2 is greater than the amount of reflected light on the side surface S2 of the light L2 in FIG. 14A. As a result, the light directly incident on the light receiving element 2 from the light emitting element 1 The amount of light decreases, and therefore the S / N ratio of the reflected light sensor can be improved.

  As in the first embodiment shown in FIG. 1, the side surface S <b> 2 ′ on the light receiving element 2 side that forms the groove 5 is located on the light receiving element 2 side with respect to the side surface on the light receiving element 2 side. The distance is inclined so as to increase toward the upper side of the groove portion 5. Therefore, compared with the case where the light emitting element 1 is parallel to the side surface on the light receiving element 2 side, the incident angle of the light emitted from the light emitting element 1 and incident on the side surface S2 ′ through the side surface S1 is larger. Therefore, the amount of reflected light at the side surface S2 ′ increases, the amount of incident light on the light receiving element 2 decreases, and the S / N ratio of the reflected light sensor can be improved.

  Further, the side surface S2 ′ on the light receiving element 2 side is a plane perpendicular to a line connecting the center of the light emitting element 1 and the center of the light receiving element 2 when the groove 5 is observed from above (see FIG. 4B). It has a region inclined with respect to it. That is, the side surface S2 'on the light receiving element 2 side is formed with a region inclined with respect to the side surface S1 on the light emitting element 1 side. Therefore, as in the prior art (FIG. 14A) and the first embodiment (FIG. 1B), the side surface S2 ′ on the light receiving element 2 side connects the center of the light emitting element 1 and the center of the light receiving element 2. Compared with the case of being perpendicular to the line, the light emitted from the light emitting element 1 passes through the side surface S1 and the inclined region (the center of the light emitting element 1 and the center of the light receiving element 2) on the side surface S2 ′. Since the incident angle of light incident on the region inclined with respect to the plane perpendicular to the line connecting the two increases, the amount of reflected light on the side surface S2 ′ increases, the amount of incident light on the light receiving element 2 decreases, and the reflected light sensor The S / N ratio can be improved.

  5A and 5B show a fifth embodiment of the reflected light sensor according to the present invention, in which FIG. 5A is a perspective view, FIG. 5B is a top view, and FIG. 5C is a cross-sectional view taken along the line CC of FIG. . Note that the side surface S2 'of the groove portion 5 of the fifth embodiment is formed by forming the side surface S2' of the reflected light sensor of FIG. The side surface S <b> 2 ′ is formed from two inclined surfaces so as to project from the light receiving element 2 side toward the light emitting element 1 side when observed from above the wiring substrate 3. In the present embodiment, the side surface S2 'is formed as a surface that is inclined with respect to the side surface of the light emitting element 1 on the light receiving element 2 side and the side surface S1 of the groove 5 on the light emitting element 1 side. In addition, the groove width of the groove part 5 is formed so as to increase from the center toward the outside. The shape of the side surface S2 'of the groove 5 in the fifth embodiment can also be applied to the side surface S2 and the side surface S2' of the reflected light sensor of FIGS.

  As shown in FIG. 5C, the incident angle with respect to the side surface S2 ′ of the light L2 that has reached the side surface S2 ′ from the light emitting element 1 through the side surface S1 through the air (groove portion 5) is as shown in FIG. It becomes larger than the incident angle with respect to the side surface S2 of the light L2. Here, the light L2 passes from the light emitting element 1 through the side surface S1 on the light emitting element 1 side of the groove portion 5 and reaches the side surface S2 ′ on the light receiving element 2 side of the groove portion 5 when viewed from above the resin layer 4. (Top view, in FIG. 5B) shows light incident on a region inclined with respect to a plane perpendicular to a line connecting the center of the light emitting element 1 and the center of the light receiving element 2 on the side surface S2 ′. As a result, the amount of reflected light on the side surface S2 ′ of the light L2 is greater than the amount of reflected light on the side surface S2 of the light L2 in FIG. 14A. As a result, the light directly incident on the light receiving element 2 from the light emitting element 1 The amount of light decreases, and therefore the S / N ratio of the reflected light sensor can be improved.

  As in the first embodiment shown in FIG. 1, the side surface S <b> 2 ′ on the light receiving element 2 side that forms the groove 5 is located on the light receiving element 2 side with respect to the side surface on the light receiving element 2 side. The distance is inclined so as to increase toward the upper side of the groove portion 5. Therefore, compared with the case where the light emitting element 1 is parallel to the side surface on the light receiving element 2 side, the incident angle of the light emitted from the light emitting element 1 and incident on the side surface S2 ′ through the side surface S1 is larger. Therefore, the amount of reflected light on the side surface S2 ′ increases, the amount of incident light on the light receiving element 2 decreases, and the S / N ratio of the reflected light sensor can be improved.

  Further, the side surface S2 ′ on the light receiving element 2 side is a plane perpendicular to the line connecting the center of the light emitting element 1 and the center of the light receiving element 2 when the groove 5 is observed from above (see FIG. 5B). It is inclined with respect to it. That is, the side surface S2 'on the light receiving element 2 side is inclined with respect to the side surface S1 on the light emitting element 1 side. Therefore, the side surface S2 ′ on the light receiving element 2 side is centered on the center of the light emitting element 1 and the center of the light receiving element 2 as in the prior art (FIG. 14A) and the first embodiment (FIG. 1B). Compared with the case where the light is perpendicular to the connecting line, the incident angle of the light emitted from the light emitting element 1 and incident on the side surface S2 ′ through the side surface S1 is increased. The amount of reflected light increases, the amount of incident light on the light receiving element 2 decreases, and the S / N ratio of the reflected light sensor can be improved.

6A and 6B show a sixth embodiment of the reflected light sensor according to the present invention, in which FIG. 6A is a perspective view, FIG. 6B is a top view, and FIG. 6C is a sectional view taken along the line CC of FIG. . 6 is perpendicular to a line connecting the center of the light-emitting element 1 and the center of the light-receiving element 2 when viewed from above the wiring board 3 in the center portion facing the light-emitting element 1 on the side surface S2 ′ of the reflected light sensor of FIG. A region inclined with respect to the surface is formed. In the present embodiment, a region inclined with respect to the side surface on the light receiving element 2 side of the light emitting element 1 and the side surface S1 on the light emitting element 1 side of the groove portion 5 is formed in the central portion. The shape of the side surface S2 ′ of the groove 5 in the sixth embodiment can also be applied to the side surface S2 and the side surface S2 ′ of the reflected light sensor of FIGS.

  As shown in FIGS. 6B and 6C, the light L3 that has reached the side surface S1 from the light-emitting element 1 through the resin layer 4 has an incident angle of about 0 with respect to the side surface S1, and therefore almost the total amount of light L3. Is refracted at the side surface S1, passes through the air (groove 5), and reaches the side surface S2 ′. However, at this time, since the incident angle of the light L3 with respect to the side surface S2 'is large, the amount of light L3 reflected by the side surface S2' and entering the resin layer 4 is reduced. Here, the light L3 passes from the light emitting element 1 through the side surface of the groove portion 5 on the light emitting element 1 side and reaches the side surface S2 ′ of the groove portion 5 on the light receiving element 2 side as viewed from above the resin layer 4 (upper surface). FIG. 6 (B) shows light emitted from the light emitting element 1 substantially parallel to a line connecting the center of the light emitting element 1 and the center of the light receiving element 2. As a result, the amount of light directly incident on the light receiving element 2 from the light emitting element 1 is reduced, and therefore the S / N ratio of the reflected light sensor can be improved. Reduction of the amount of light L3 entering is effective for improving the S / N ratio.

  As in the first embodiment shown in FIG. 1, the side surface S <b> 2 ′ on the light receiving element 2 side that forms the groove 5 is located on the light receiving element 2 side with respect to the side surface on the light receiving element 2 side. The distance is inclined so as to increase toward the upper side of the groove portion 5. Therefore, compared with the case where the light emitting element 1 is parallel to the side surface on the light receiving element 2 side, the incident angle of the light emitted from the light emitting element 1 and incident on the side surface S2 ′ through the side surface S1 is larger. Therefore, the amount of reflected light at the side surface S2 ′ increases, the amount of incident light on the light receiving element 2 decreases, and the S / N ratio of the reflected light sensor can be improved.

  Further, the side surface S2 ′ on the light receiving element 2 side is a plane perpendicular to the line connecting the center of the light emitting element 1 and the center of the light receiving element 2 when the groove 5 is observed from above (see FIG. 6B). It has a region inclined with respect to it. That is, the side surface S2 'on the light receiving element 2 side is formed with a region inclined with respect to the side surface S1 on the light emitting element 1 side. Therefore, the side surface S2 ′ on the light receiving element 2 side is centered on the center of the light emitting element 1 and the center of the light receiving element 2 as in the prior art (FIG. 14A) and the first embodiment (FIG. 1B). Compared to the case where the light is emitted from the light emitting element 1, the inclined region (the center of the light emitting element 1 and the center of the light receiving element 2) on the side surface S2 ′ of the light emitted from the light emitting element 1 through the side surface S1 is compared with the case where the light is emitted from the light emitting element 1. Since the incident angle of light incident on a region inclined with respect to a plane perpendicular to the line connecting the two increases, the amount of reflected light on the side surface S2 ′ increases, the amount of incident light on the light receiving element 2 decreases, and the reflected light sensor The S / N ratio can be improved. In particular, the inclined region (a region inclined with respect to a plane perpendicular to the line connecting the center of the light emitting element 1 and the center of the light receiving element 2) is oblique to the line connecting the center of the light emitting element 1 and the center of the light receiving element 2. Therefore, the amount of reflected light at the side surface S2 ′ is efficiently increased, and the S / N ratio of the reflected light sensor can be improved efficiently.

  7A and 7B show a seventh embodiment of the reflected light sensor according to the present invention, in which FIG. 7A is a perspective view, FIG. 7B is a top view, and FIG. 7C is a sectional view taken along the line CC of FIG. . The side surface S 1 ′ of the seventh embodiment is formed such that the side surface S 1 ′ of the reflected light sensor of the second embodiment has an R shape surrounding the light receiving element 2. The side surface S <b> 1 ′ is formed as a curved surface that projects from the light receiving element 2 side toward the light emitting element 1 side when observed from above the wiring substrate 3. In the present embodiment, the side surface S1 ′ is formed as a surface inclined from the side surface on the light receiving element 2 side of the light emitting element 1 and the side surface S2 on the light emitting element 2 side of the groove portion when observed from above the wiring substrate 3. Yes. The shape of the side surface S1 'of the groove 5' in the seventh embodiment can also be applied to the side surface S1 and the side surface S1 'of the reflected light sensor of FIGS.

  As shown in FIG. 7B, the incident angle of the light L2 reaching the side surface S1 'from the light emitting element 1 with respect to the side surface S1' is larger than the incident angle of the light L2 with respect to the side surface S1 in FIG. As a result, the amount of reflected light on the side surface S1 ′ of the light L2 is larger than the amount of reflected light on the side surface S1 of the light L2 in FIG. 14A. As a result, the light directly incident on the light receiving element 2 from the light emitting element 1 The amount of light decreases, and therefore the S / N ratio of the reflected light sensor can be improved.

  As in the second embodiment shown in FIG. 2, the side surface S1 ′ on the light emitting element 1 side forming the groove 5 ′ is located on the light receiving element 2 side with respect to the side surface on the light receiving element 2 side. Is inclined so as to increase toward the upper side of the groove 5 ′. Therefore, the light emitted from the light emitting element 1 is incident on the side surface S1 ′ as compared with the case where the light emitting element 1 is parallel to the side surface on the light receiving element 2 side like the conventional light reflection sensor shown in FIG. Since the incident angle of light increases, the amount of reflected light on the side surface S1 ′ increases, the amount of incident light on the light receiving element 2 decreases, and the S / N ratio of the reflected light sensor can be improved.

  Further, the side surface S1 ′ on the light receiving element 1 side is a surface perpendicular to a line connecting the center of the light emitting element 1 and the center of the light receiving element 2 when the groove 5 ′ is observed from above (see FIG. 7B). With an inclined region. Therefore, as in the prior art (FIG. 14A) and the second embodiment (FIG. 2B), the side surface S1 ′ on the light emitting element 1 side is the center of the light emitting element 1 and the center of the light receiving element 2. Compared with the case of being perpendicular to the connecting line, of the light emitted from the light emitting element 1, the inclined region in the side surface S 1 ′ (perpendicular to the line connecting the center of the light emitting element 1 and the center of the light receiving element 2). Since the incident angle of light incident on the region inclined with respect to the surface increases, the amount of reflected light on the side surface S1 ′ increases, the amount of incident light on the light receiving element 2 decreases, and the S / N ratio of the reflected light sensor is increased. Can be improved.

  8A and 8B show an eighth embodiment of the reflected light sensor according to the present invention, in which FIG. 8A is a perspective view, FIG. 8B is a top view, and FIG. 8C is a sectional view taken along the line CC of FIG. . The side surface S 1 ′ of the eighth embodiment is formed by forming the inclined surface S 1 ′ of the reflected light sensor of the second embodiment as an inclined surface surrounding the light receiving element 2. The side surface S <b> 1 ′ is formed from two inclined surfaces so as to project from the light receiving element 2 side toward the light emitting element 1 side when observed from above the wiring substrate 3. In the present embodiment, the side surface S1 ′ is formed as a surface inclined from the side surface on the light receiving element 2 side of the light emitting element 1 and the side surface S2 on the light emitting element 2 side of the groove when observed from above the wiring board 3. ing. The groove width of the groove 5 'is formed so as to decrease from the center toward the outside. The shape of the side surface S1 'of the groove 5' in the eighth embodiment can also be applied to the vertical surface S1 and the inclined surface S1 'of the reflected light sensor of FIGS.

  As shown in FIG. 8B, the incident angle of the light L2 reaching the side surface S1 'from the light emitting element 1 with respect to the side surface S1' is larger than the incident angle of the light L2 with respect to the side surface S1 in FIG. As a result, the amount of reflected light on the side surface S1 ′ of the light L2 is larger than the amount of reflected light on the side surface S1 of the light L2 in FIG. 14A. As a result, the light directly incident on the light receiving element 2 from the light emitting element 1 The amount of light decreases, and therefore the S / N ratio of the reflected light sensor can be improved.

  As in the second embodiment shown in FIG. 2, the side surface S1 ′ on the light emitting element 1 side forming the groove 5 ′ is located on the light receiving element 2 side with respect to the side surface on the light receiving element 2 side. Is inclined so as to increase toward the upper side of the groove 5 ′. Therefore, the light emitted from the light emitting element 1 is incident on the side surface S1 ′ as compared with the case where the light emitting element 1 is parallel to the side surface on the light receiving element 2 side like the conventional light reflection sensor shown in FIG. Since the incident angle of light increases, the amount of reflected light on the side surface S1 ′ increases, the amount of incident light on the light receiving element 2 decreases, and the S / N ratio of the reflected light sensor can be improved.

  Further, the side surface S1 ′ on the light emitting element 1 side is a surface perpendicular to the line connecting the center of the light emitting element 1 and the center of the light receiving element 2 when the groove 5 ′ is observed from above (see FIG. 8B). It is inclined with respect to. Therefore, as in the conventional case (FIG. 14A) and the second embodiment (FIG. 2B), the side surface S1 ′ on the light emitting element 1 side is the center of the light emitting element 1 and the center of the light receiving element 2. Compared with the case of being perpendicular to the connecting line, the incident angle of the light incident on the side surface S1 ′ out of the light emitted from the light emitting element 1 is increased, so that the amount of reflected light on the side surface S1 ′ increases. The amount of light incident on the light receiving element 2 is reduced, and the S / N ratio of the reflected light sensor can be improved.

  9A and 9B show a ninth embodiment of the reflected light sensor according to the present invention, in which FIG. 9A is a perspective view, FIG. 9B is a top view, and FIG. 9C is a sectional view taken along the line CC of FIG. . FIG. 9 shows an area inclined with respect to a plane perpendicular to a line connecting the center of the light emitting element 1 and the center of the light receiving element 2 on the side surface S1 'of the reflected light sensor of FIG. In the present embodiment, a region inclined with respect to the side surface of the light emitting element 1 on the light receiving element 2 side and the side surface S2 of the groove 5 ′ on the light receiving element 2 side is formed in the central portion. The shape of the side surface S1 'of the groove 5' in the ninth embodiment can also be applied to the side surface S1 and the side surface S1 'of the reflected light sensor of FIGS.

  As shown in FIGS. 9B and 9C, the light L3 that has reached the side surface S1 ′ from the light emitting element 1 through the resin layer 4 has a large incident angle with respect to the side surface S1 ′. Most of the light is reflected by the side surface S1 ′, and the amount of light that passes through the air (groove 5 ′) and enters the resin layer 4 is reduced. As a result, the amount of light directly incident on the light receiving element 2 from the light emitting element 1 is reduced, and therefore the S / N ratio of the reflected light sensor can be improved.

  Similar to the second embodiment shown in FIG. 2, the side surface S1 ′ on the light receiving element 1 side forming the groove 5 ′ is located on the light receiving element 2 side with respect to the side surface on the light receiving element 2 side. Is inclined so as to increase toward the upper side of the groove 5 ′. Therefore, compared with the case where the side surface of the light emitting element 1 is parallel to the side surface on the light receiving element 2 side, the incident angle of the light incident on the side surface S1 ′ out of the light emitted from the light emitting element 1 is increased. The amount of reflected light at 'increases, the amount of incident light on the light receiving element 2 decreases, and the S / N ratio of the reflected light sensor can be improved.

  Further, the side surface S1 ′ on the light emitting element 1 side is a surface perpendicular to a line connecting the center of the light emitting element 1 and the center of the light receiving element 2 when the groove 5 ′ is observed from above (see FIG. 9B). It is inclined with respect to. Therefore, as in the prior art (FIG. 14A) and the second embodiment (FIG. 2B), the side surface S1 ′ on the light emitting element 1 side is the center of the light emitting element 1 and the center of the light receiving element 2. Compared with the case of being perpendicular to the connecting line, of the light emitted from the light emitting element 1, the inclined region in the side surface S 1 ′ (perpendicular to the line connecting the center of the light emitting element 1 and the center of the light receiving element 2). Since the incident angle of light incident on the region inclined with respect to the surface increases, the amount of reflected light on the side surface S1 ′ increases, the amount of incident light on the light receiving element 2 decreases, and the S / N ratio of the reflected light sensor is increased. Can be improved. In particular, the inclined region (region inclined with respect to a plane perpendicular to the line connecting the center of the light emitting element 1 and the center of the light receiving element 2) intersects the line connecting the center of the light emitting element 1 and the center of the light receiving element 2. Therefore, the amount of reflected light at the side surface S1 ′ can be increased efficiently, and the S / N ratio of the reflected light sensor can be improved efficiently.

  10A and 10B show a reflected light sensor according to a tenth embodiment of the present invention, in which FIG. 10A is a perspective view, FIG. 10B is a top view, and FIG. 10C is a sectional view taken along the line CC of FIG. . The side surfaces S1 ′ and S2 ′ of the tenth embodiment are formed so as to have an R shape surrounding the light receiving element 2 on the side surfaces S1 ′ and S2 ′ of the reflected light sensor of the third embodiment. Is. The side surface S <b> 1 ′ is formed as a curved surface that projects from the light receiving element 2 side toward the light emitting element 1 side when observed from above the wiring substrate 3. In the present embodiment, the side surfaces S <b> 1 ′ and S <b> 2 ′ of the groove 5 ″ are formed as surfaces that are inclined with respect to the side surface of the light emitting element 1 on the light receiving element 2 side. The shapes of the side surfaces S1 'and S2' of the groove portion 5 in the tenth embodiment can also be applied to the side surfaces S1 and S1 'of the reflected light sensor of FIGS.

  As shown in FIG. 10B, the incident angle of the light L2 reaching the side surface S1 'from the light emitting element 1 with respect to the side surface S1' is larger than the incident angle of the light L2 with respect to the side surface S1 in FIG. As a result, the amount of reflected light on the side surface S1 'of the light L2 is greater than the amount of reflected light on the side surface S1 of the light L2 in FIG. Further, the incident angle of the light L2 that has reached the side surface S2 ′ through the side surface S1 ′ through the air (groove 5 ″) with respect to the side surface S2 ′ is also greater than the incident angle of the light L2 with respect to the side surface S2 ′ in FIG. As a result, the amount of light reflected by the side surface S2 of the light L2 is larger than the amount of light reflected by the side surface S2 of the light L2 in FIG. The amount of light is reduced, and therefore the S / N ratio of the reflected light sensor can be improved.

  As in the third embodiment shown in FIG. 3, the side surfaces S1 ′ and S2 ′ constituting the groove 5 ″ are both on the light receiving element 2 side with respect to the side surface on the light receiving element 2 side of the light emitting element 1. Is inclined so as to increase toward the upper side of the groove portion 5 ″. Therefore, compared with the case where the side surface S1 ′ and the side surface S2 ′ are parallel to the side surface of the light emitting element 1 on the light receiving element 2 side, the light incident on the side surface S1 ′ and the side surface S1 out of the light emitted from the light emitting element 1 are compared. Since the incident angle of the light passing through 'and entering the side surface S2' increases, the amount of reflected light on the side surface S1 'and side surface S2' increases, the amount of incident light on the light receiving element 2 decreases, and the reflected light sensor S / The N ratio can be improved.

  Further, the side surface S1 ′ and the side surface S2 ′ are surfaces perpendicular to a line connecting the center of the light emitting element 1 and the center of the light receiving element 2 when the groove 5 ″ is observed from above (see FIG. 10B). With an inclined region. Therefore, as in the prior art (FIG. 14A and the third embodiment (FIG. 3B)), the side surface S1 ′ and the side surface S2 ′ connect the center of the light emitting element 1 and the center of the light receiving element 2. Compared to the case where the light is emitted from the light emitting element 1, the inclined region (the line connecting the center of the light emitting element 1 and the center of the light receiving element 2) on the side surface S 1 ′ and the side surface S 2 ′ is compared. Since the incident angle of light incident on the region inclined with respect to the vertical surface increases, the amount of reflected light on the side surface S1 ′ and side surface S2 ′ increases, the amount of incident light on the light receiving element 2 decreases, and the reflected light sensor The S / N ratio can be improved.

  11A and 11B show an eleventh embodiment of a reflected light sensor according to the present invention, in which FIG. 11A is a perspective view, FIG. 11B is a top view, and FIG. 11C is a sectional view taken along line CC in FIG. . The side surface S1 ′ and the side surface S2 ′ of the eleventh embodiment are formed as inclined surfaces surrounding the light receiving element 2 with the side surface S1 ′ and the side surface S2 ′ of the reflected light sensor of the third embodiment. It is. The side surface S1 'and the side surface S2' are formed from two inclined surfaces so as to protrude from the light receiving element 2 side toward the light emitting element 1 side when observed from above the wiring board 3. In the present embodiment, the side surface S <b> 1 ′ and the side surface S <b> 2 ′ are formed as surfaces that are inclined with respect to the side surface of the light emitting element 1 on the light receiving element 2 side. The shapes of the side surface S1 'and the side surface S2' of the groove 5 "in the eleventh embodiment can also be applied to the side surface S1 and the side surface S1 'of the reflected light sensor of FIGS.

  As shown in FIG. 11B, the incident angle of the light L2 reaching the side surface S1 'from the light emitting element 1 with respect to the side surface S1' is larger than the incident angle of the light L2 with respect to the side surface S1 in FIG. As a result, the amount of reflected light on the side surface S1 'of the light L2 is greater than the amount of reflected light on the side surface S1 of the light L2 in FIG. Further, the incident angle of the light L2 that has reached the side surface S2 ′ through the side surface S1 ′ through the air (groove 5 ″) with respect to the side surface S2 ′ is also larger than the incident angle of the light L2 with respect to the side surface S2 in FIG. As a result, the amount of light reflected by the side surface S2 ′ of the light L2 is greater than the amount of light reflected by the side surface S2 of the light L2 in FIG. The amount of light is reduced, and therefore the S / N ratio of the reflected light sensor can be improved.

  As in the third embodiment shown in FIG. 3, the side surfaces S1 ′ and S2 ′ constituting the groove 5 ″ are both on the light receiving element 2 side with respect to the side surface on the light receiving element 2 side of the light emitting element 1. Is inclined so as to increase toward the upper side of the groove portion 5 ″. Therefore, compared with the case where the side surface S1 ′ and the side surface S2 ′ are parallel to the side surface of the light emitting element 1 on the light receiving element 2 side, the light incident on the side surface S1 ′ and the side surface S1 out of the light emitted from the light emitting element 1 are compared. Since the incident angle of the light passing through 'and entering the side surface S2' increases, the amount of reflected light on the side surface S1 'and side surface S2' increases, the amount of incident light on the light receiving element 2 decreases, and the reflected light sensor S / The N ratio can be improved.

  Furthermore, the side surface S1 ′ and the side surface S2 ′ are perpendicular to the line connecting the center of the light emitting element 1 and the center of the light receiving element 2 when the groove 5 ′ is observed from above (see FIG. 11B). It has a region inclined with respect to it. Therefore, as in the prior art (FIG. 14A) and the third embodiment (FIG. 3B), the side surface S1 ′ and the side surface S2 ′ connect the center of the light emitting element 1 and the center of the light receiving element 2. Compared with the case of being perpendicular to the line, of the light emitted from the light emitting element 1, the inclined regions (the line connecting the center of the light emitting element 1 and the center of the light receiving element 2) on the side surface S 1 ′ and the side surface S 2 ′. Since the incident angle of light incident on the region inclined with respect to the surface perpendicular to the surface increases, the amount of reflected light on the side surface S1 ′ and side surface S2 ′ increases, the amount of incident light on the light receiving element 2 decreases, and the reflected light The S / N ratio of the sensor can be improved.

  12A and 12B show a reflected light sensor according to a twelfth embodiment of the present invention. FIG. 12A is a perspective view, FIG. 12B is a top view, and FIG. 12C is a sectional view taken along the line CC of FIG. . Note that the side surface S1 ′ and the side surface S2 ′ of the groove portion of the twelfth embodiment are arranged on the wiring substrate at the center portion facing the light emitting element 1 of the side surface S1 ′ and the side surface S2 ′ of the reflected light sensor of the third embodiment. 3, a region inclined with respect to a plane perpendicular to a line connecting the center of the light emitting element 1 and the center of the light receiving element 2 is formed. In the present embodiment, the side surface S 1 ′ and the side surface S 2 ′ are formed in the center with a region inclined with respect to the side surface of the light emitting element 1 on the light receiving element 2 side. The shape of the side surface S2 'of the groove 5 "in the twelfth embodiment can also be applied to the side surface S1, side surface S2'; side surface S1 ', side surface S2 of the reflected light sensor of FIGS.

  As shown in FIGS. 12B and 12C, since the incident angle of the light L3 that has reached the side surface S1 ′ from the light emitting element 1 through the resin layer 4 with respect to the side surface S1 ′ is large, most of the light L3 has a side surface S1. The amount of light reflected by 'and transmitted through the air (groove portion 5 ") and entering the resin layer 4 is reduced. Light that has passed through the side surface S1' and reached the side surface S2 'through the air (groove portion 5") The incident angle with respect to the side surface S2 ′ of L3 is also larger than the incident angle with respect to the side surface S2 of the light L3 in FIG. As a result, the amount of light directly incident on the light receiving element 2 from the light emitting element 1 is reduced, and therefore the S / N ratio of the reflected light sensor can be improved. Reduction of the amount of light L3 entering is effective for improving the S / N ratio.

  Similarly to the third embodiment shown in FIG. 3, the side surface S1 ′ and the side surface S2 ′ constituting the groove 5 ″ are both closer to the light receiving element 2 side than the side surface of the light emitting element 1 on the light receiving element 2 side. It is inclined so that the distance from the side surface increases toward the upper side of the groove 5 ″. Therefore, compared with the case where the side surface S1 ′ and the side surface S2 ′ are parallel to the side surface of the light emitting element 1 on the light receiving element 2 side, the light incident on the side surface S1 ′ and the side surface S1 out of the light emitted from the light emitting element 1 are compared. Since the incident angle of the light passing through 'and entering the side surface S2' increases, the amount of reflected light on the side surface S1 'and side surface S2' increases, the amount of incident light on the light receiving element 2 decreases, and the reflected light sensor S / The N ratio can be improved.

  Further, the side surface S1 ′ and the side surface S2 ′ are surfaces perpendicular to a line connecting the center of the light emitting element 1 and the center of the light receiving element 2 when the groove 5 ″ is observed from above (see FIG. 12B). With an inclined region. Therefore, as in the prior art (FIG. 14A) and the third embodiment (FIG. 3B), the side surface S1 ′ and the side surface S2 ′ connect the center of the light emitting element 1 and the center of the light receiving element 2. Compared with the case where the light is emitted from the light emitting element 1, the inclined region (a surface perpendicular to the line connecting the center of the light emitting element 1 and the center of the light receiving element 2) in the side surface S 1 ′ of the light emitted from the light emitting element 1. Since the incident angle of light incident on the region inclined with respect to the side surface S1 ′ and the side surface S2 ′ increases, the amount of incident light on the light receiving element 2 decreases, and the S / of the reflected light sensor decreases. The N ratio can be improved. In particular, the inclined region (region inclined with respect to a plane perpendicular to the line connecting the center of the light emitting element 1 and the center of the light receiving element 2) intersects the line connecting the center of the light emitting element 1 and the center of the light receiving element 2. Therefore, the amount of reflected light at the side surface S1 ′ and the side surface S2 ′ can be increased efficiently, and therefore the S / N ratio of the reflected light sensor can be improved efficiently.

  That is, in the first to twelfth embodiments, at least one of the side surface of the groove portion on the light emitting element 1 side and the side surface of the light receiving element 2 side has a distance from the light emitting element 1 in the cross section (sectional view) of the groove portion. It inclines to the light receiving element 2 side so that it may become large upwards of a groove part.

  In the fourth to twelfth embodiments, at least one of the side surface on the light emitting element 1 side and the side surface on the light receiving element 2 side of the groove portion is the center of the light emitting element 1 and the light receiving element as viewed from above the groove portion. An inclined region inclined with respect to a plane perpendicular to the line connecting the centers of the two is formed. And it is mounted on the substrate so that one side surface of the light emitting element 1 and one side surface of the light receiving element 2 face each other, and at least one of the side surface on the light emitting element 1 side and the side surface on the light receiving element 2 side has a groove portion. When viewed from above, an inclined region inclined with respect to the side surface of the light emitting element 1 facing the light receiving element 2 is formed.

  Furthermore, in the fourth, fifth, seventh, eighth, tenth and eleventh embodiments, at least one of the side surface of the groove portion on the light emitting element 1 side and the side surface of the light receiving element 2 side is viewed from above the groove portion. It has a shape that protrudes toward one light receiving element 2, for example, a curved surface or two inclined surfaces, and the inclined region is formed in almost the entire region of the groove in the major axis direction.

  Further, in the sixth, ninth and twelfth embodiments, the inclined region is formed in a partial region intersecting a line connecting the center of the light emitting element 1 and the center of the light receiving element 2 when viewed from above the groove. .

  The selection of the side surface of the groove portion to be inclined toward the light receiving element 2 side in the cross section of the groove portion and the inclined region are the light distribution characteristics of the light emitting element 1 mounted on the substrate and the positions of the light emitting element 1 and the light receiving element 2 on the substrate. This is performed according to the relationship and the size of the reflected light sensor.

  In addition, as shown in FIG. 13, the light receiving element 2 can be mounted by being rotated by 90 ° with respect to the direction of the light emitting element 1, thereby reducing the light incident from the side surface of the light receiving element 2. The amount of light directly incident on the light receiving element 2 from the light emitting element 1 is reduced, so that the S / N ratio of the reflected light sensor can be improved.

1: Light emitting device
2: Light receiving element
3: Wiring substrate 4: Resin layer 5: L-shaped groove 5 ': M-shaped groove 5 ": Groove 6: Light-shielding die attach material layer 7: Metal layer
101: Light emitting element 102: Light receiving element 103: Light transmissive resin layer
103a, 103b: Lens
104: Groove
L1, L2, L3: Light S1, S2: Side S1 ′, S2 ′: Side

Claims (5)

A light emitting element and a light receiving element formed on the substrate;
A reflected light sensor comprising: a light-transmitting resin layer that seals the light-emitting element and the light-receiving element;
The light transmissive resin layer has a groove formed between the light emitting element and the light receiving element,
At least one of the first surface that faces the light emitting element and the second surface that faces the light receiving element that form the groove is at a distance from the light emitting element above the groove in the cross section of the groove. The reflected light sensor is inclined toward the light receiving element so as to become larger toward the light receiving element. At least one of the first surface and the second surface includes
2. The reflected light sensor according to claim 1, wherein an inclined region inclined with respect to a plane perpendicular to a line connecting the center of the light emitting element and the center of the light receiving element is formed when viewed from above the groove. The light emitting element and the light receiving element are mounted on the substrate such that one side surface of the light emitting element and one side surface of the light receiving element face each other.
At least one of the first surface and the second surface includes
2. The reflected light sensor according to claim 1, wherein an inclined region inclined with respect to a side surface of the light emitting element facing the light receiving element is formed when the groove is viewed from above. The inclined region is
4. The reflected light sensor according to claim 2, wherein the reflected light sensor is formed in a partial region intersecting a line connecting the center of the light emitting element and the center of the light receiving element when viewed from above the groove. The groove is
When viewed from above the substrate, the partial area intersecting a line connecting the center of the light emitting element and the center of the light receiving element is inclined with respect to the line, and the area outside the partial area is relative to the line. The reflected light sensor according to claim 4, wherein the reflected light sensor is vertical.

Images