JP6537948B2 - Proximity sensor and electronic device - Google Patents

Description

  The present invention relates to a proximity sensor and an electronic device provided with a light emitting unit and a light receiving unit.

  BACKGROUND In recent years, electronic devices such as smartphones are provided with a proximity sensor. As disclosed in Patent Document 1, the proximity sensor includes a light emitting unit and a light receiving unit, and the detection light emitted from the light emitting unit is reflected by an object, that is, an object to be detected, and is incident on the light receiving unit. Proximity sensor, ie, for detecting the proximity of an object to an electronic device. FIG. 9 is a longitudinal sectional view showing the structure of a conventional general proximity sensor.

  As shown in FIG. 9, the proximity sensor 111 includes a proximity sensor module 121, a shielding member 122, and a window member 123. The proximity sensor module 121 includes a substrate 131, a shielding resin layer 132, a light emitting unit 133, a light receiving unit 134, and a light transmission. A resin layer 135 and a permeable resin layer 136 are provided. The light emitting portion 133 is embedded in the transmitting resin layer 135 in the light emitting portion arranging region 132 a of the shielding resin layer 132, and the light receiving portion 134 is embedded in the transmitting resin layer 136 in the light receiving portion arranging region 132 b of the shielding resin layer 132. There is.

  The detection light 133 a emitted from the light emitting unit 133 passes through the light emission passage hole 122 a of the shielding member 122, passes through the window member 123, and is emitted to the outside from the top surface 123 c of the window member 123. The reflected light of the detection light 133a reflected by the object to be detected, that is, the incident light 134a enters the window member 123 from the top surface 123c of the window member 123, passes through the window member 123, and passes through the light receiving passage hole 122b of the shielding member 122. It passes through and is incident on the light receiving unit 134.

  In the proximity sensor 111 shown in FIG. 9, the surface of the window member 123 from which the detection light 133a emitted from the light emitting unit 133 is emitted to the outside and the surface of the window member 123 on which the incident light 134a to the light receiving unit 134 is flat are flat. It is only the top surface 123c.

International Publication No. 2015/025591

  The above-described conventional proximity sensor 111 is required to be miniaturized, for example, when mounted on a smartphone. FIG. 10 is a longitudinal sectional view showing the configuration of the proximity sensor 112 obtained by miniaturizing the proximity sensor 111 shown in FIG.

  As shown in FIG. 10, in the proximity sensor 112, the window member 124 serves as an outer peripheral surface, a side surface 124a vertically rising forward from the shielding member 122, and an intermediate surface 124b inclined toward the center of the window member 124 from the side surface And a top surface 124 c parallel to the bottom surface of the window member 124. The intermediate surface 124b is a surface generated by deburring after forming the window member 124. When deburring is simply performed, the inclination angle of the intermediate surface 124b with respect to the bottom surface of the window member 124 is 45 °.

In such a proximity sensor 112, the detection light 133a emitted by the light emitting unit 133 is incident on the side surface 124a, the intermediate surface 124b, and the top surface 124c of the window member 124 by downsizing. Here, when the window member 124 is generally made of, for example, acrylic, the incident angle at which light is totally reflected on the outer peripheral surface of the window member 124 is 43 °. Therefore, when the inclination angle of the intermediate surface 124b is 45 ° as described above, a part of the detection light 133a incident on the intermediate surface 124b is the intermediate surface 124b first incident as shown by the arrow in FIG. The light is totally reflected and travels in the window member 124 and is totally reflected by the intermediate surface 124 b on the opposite side, and then enters the light receiving unit 134. Therefore, the proximity sensor 112 has a problem that crosstalk increases and it becomes difficult to perform accurate detection operation.

  Therefore, an object of the present invention is to provide a proximity sensor and an electronic device capable of suppressing an increase in crosstalk even when miniaturized.

  In order to solve the above-mentioned subject, the proximity sensor concerning one mode of the present invention is provided with the window member ahead of the light emission part and the light reception part, and the detection light which the light emission part emitted is emitted outside from the window member On the other hand, in the proximity sensor in which the reflected light of the detection light from the object to be detected enters from the window member and enters the light receiving unit, the window member has a shape projecting forward of the light emitting unit and the light receiving unit The outer peripheral surface includes a side surface rising forward from the light emitting unit side, a top surface located at the center of the window member, and an intermediate surface located between the top surface and the side surface, The detection light incident on the top surface and the intermediate surface is emitted from the top surface and the intermediate surface to the outside without being totally reflected by the top surface and the intermediate surface. There is.

  According to one aspect of the present invention, it is possible to suppress a situation in which the detection light totally reflected on the outer peripheral surface of the window member is incident on the light receiving section, and to reduce crosstalk.

It is a longitudinal cross-sectional view which shows the structure of the proximity sensor of the reference example of this invention. It is a disassembled perspective view of the proximity sensor shown in FIG. (A) of FIG. 3 is a plan view of the proximity sensor module shown in FIG. 1, (b) of FIG. 3 is a cross-sectional view taken along line X1-X1 in (a) of FIG. 3, (c) of FIG. 3 is a cross-sectional view taken along line Y1-Y1 in (a) of FIG. (A) of FIG. 4 is a plan view of the shielding member shown in FIG. 1, (b) of FIG. 4 is a cross-sectional view taken along line X2-X2 in (a) of FIG. 4, (c) of FIG. It is Y2-Y2 arrow sectional drawing in (a) of FIG. (A) of FIG. 5 is a plan view of the window member shown in FIG. 1, (b) of FIG. 5 is an X3-X3 arrow sectional view in (a) of FIG. 5, (c) of FIG. It is Y3-Y3 arrow sectional drawing in (a) of FIG. It is a longitudinal cross-sectional view which shows the structure of the proximity sensor of the other reference example of this invention. It is a longitudinal cross-sectional view which shows the structure of the proximity sensor of embodiment of this invention. It is a longitudinal cross-sectional view which shows the structure of the proximity sensor of other embodiment of this invention. It is a longitudinal cross-sectional view which shows the structure of the conventional common proximity sensor. It is a longitudinal cross-sectional view which shows the structure of the proximity sensor which miniaturized the proximity sensor shown in FIG.

[Reference Example 1]
Reference examples of the present invention will be described below based on the drawings. FIG. 1 is a longitudinal sectional view showing the configuration of a proximity sensor according to a reference example of the present invention. FIG. 2 is an exploded perspective view of the proximity sensor shown in FIG. (A) of FIG. 3 is a plan view of the proximity sensor module shown in FIG. 1, (b) of FIG. 3 is a cross-sectional view taken along line X1-X1 in (a) of FIG. 3, (c) of FIG. , Y1-Y in FIG.
It is 1 arrow sectional drawing. (A) of FIG. 4 is a plan view of the shielding member shown in FIG. 1, (b) of FIG. 4 is a cross-sectional view taken along line X2-X2 in (a) of FIG. 4, (c) of FIG. It is Y2-Y2 arrow sectional drawing in (a) of FIG. (A) of FIG. 5 is a plan view of the window member shown in FIG. 1, (b) of FIG. 5 is an X3-X3 arrow sectional view in (a) of FIG. 5, (c) of FIG. It is Y3-Y3 arrow sectional drawing in (a) of FIG.

  As shown in FIGS. 1 to 5, the proximity sensor 11 includes a proximity sensor module 21, a shielding member 22 and a window member 23.

(Proximity sensor module 21)
The proximity sensor module 21 includes a substrate 31, a shielding resin layer 32, a light emitting unit 33, a light receiving unit 34, a transmitting resin layer 35, and a transmitting resin layer 36.

  The shielding resin layer 32 is fixed on the substrate 31 and has a light emitting portion disposition region 32 a and a light receiving portion disposition region 32 b. The light emitting portion disposition area 32a and the light receiving portion disposition area 32b are respectively formed by through holes penetrating the shielding resin layer 32 in the vertical direction, and are arranged at predetermined intervals. The light emitting portion 33 is disposed in the light emitting portion disposition area 32a, and the light receiving portion 34 is disposed in the light receiving portion disposition area 32b. In the present embodiment, the diameter of the light emitting portion disposition area 32a is smaller than the diameter of the light receiving portion disposition area 32b in accordance with the diameter of the light emitting portion 33 smaller than the diameter of the light receiving portion 34. However, the present invention is not limited to this, and the light emitting portion 33 and the light receiving portion 34 may have the same diameter, and the diameter of the light emitting portion disposition region 32a may be the same as the diameter of the light receiving portion disposition region 32b. Alternatively, the light emitting portion 33 may have a diameter larger than that of the light receiving portion 34, and the diameter of the light emitting portion arranging region 32a may be larger than the diameter of the light receiving portion arranging region 32b.

  The light emitting unit 33 has a light emitting element, and emits detection light 33a (see FIG. 1) forward. The detection light 33a is, for example, an infrared ray. The detection light 33a may be other commonly used light other than infrared light, and may be, for example, visible light. The light receiving unit 34 includes a light receiving element, and detects incident light 34 a on the proximity sensor 11 by reflected light or the like of the detection light 33 a. The area of the detection light 33a and the area of the incident light 34a are as shown in FIG.

  The height of the shielding resin layer 32 is higher than the height of the light emitting portion 33 and the light receiving portion 34, and the transmitting resin layer 35 is provided on and around the light emitting portion 33 of the light emitting portion disposition region 32a. A transparent resin layer 36 is provided on and around the light receiving portion 34 of the region 32 b. Thus, the light emitting portion 33 is embedded in the transmission resin layer 35, and the light receiving portion 34 is embedded in the transmission resin layer 36. The upper surfaces of the permeable resin layers 35 and 36 are curved in a convex shape.

(Shield member 22)
The shielding member 22 is formed in a plate shape in the example of FIGS. 1 and 2 and is fixed on the shielding resin layer 32. A light emission passage hole 22 a and a light reception passage hole 22 b which are through holes are formed in the shielding member 22 at positions corresponding to the light emission unit arrangement region 32 a and the light reception unit arrangement region 32 b. The light emission passage hole 22a regulates the range in which the detection light 33a emitted from the light emitting unit 33 spreads, that is, the range of the outer peripheral surface of the window member 23 where the detection light 33a enters from the inside of the window member 23. The light receiving passage hole 22 b regulates the range of the incident light 34 a incident on the light receiving unit 34. In FIG. 1, the diameter of the light emission passage hole 22a is smaller than the diameter of the light emission portion arrangement region 32a of the shielding resin layer 32, and similarly, the light reception passage hole 22b passes through the light reception portion arrangement region 32b of the shielding resin layer 32. The case where it is smaller than the diameter is shown as an example. However, it is not necessary to limit to this, The shielding member 22 should just have a function which each restrict | limits the range of the detection light 32a, and the range of the incident light 34a.

(Window member 23)
In this embodiment, the window member 23 has a rectangular bottom whose bottom surface is long in the direction in which the light emission passage holes 22a and the light reception passage holes 22b are aligned, that is, in the arrangement direction of the light emission portion 33 and the light reception portion 34. However, it is not necessary to limit to this, and window member 23 should just be formed on shielding member 22 so that light emission passage hole 22a and light reception passage hole 22b may be closed from the upper surface.

  The window member 23 has a shape projecting forward from the shielding member 22. As the outer peripheral surface, a side surface 23a vertically rising from the shielding member 22 vertically, an intermediate surface 23b inclined from the side surface toward the center of the window member 23, It has a top surface 23 c parallel to the bottom surface of the window member 23. The intermediate surface 23 b and the top surface 23 c are central side surfaces located closer to the center of the window member 23 than the side surfaces 23 a. The intermediate surface 23 b is usually a surface generated by deburring after the window member 23 is formed. In the proximity sensor 11, the inclination angle of the intermediate surface 23b with respect to the bottom surface of the window member 23 is larger than 45 °.

(Incidence of detection light 33a on the outer peripheral surface of the window member 23)
In the proximity sensor 11, the detection light 33a emitted from the light emitting unit 33 is incident on the side surface 23a, the intermediate surface 23b, and the top surface 23c of the window member 23 by downsizing. The light of the optical axis of the detection light 33a is incident on the top surface 23c and is emitted from the top surface 23c to the outside. The incident angle of the detection light 33a to the side surface 23a and the incident angle of the detection light 33a to the intermediate surface 23b (θ1 shown in FIG. 1) are determined by the refractive index of the window member 23. The side surface 23a and the intermediate surface 23b It is equal to or more than the angle at which the detection light 33a is totally reflected. The detection light 33a totally reflected to the inside of the window member 23 by the side surface 23a and the intermediate surface 23b is emitted from the top surface 23c to the outside. Further, the detection light 33a directly incident on the top surface 23c is emitted from the top surface 23c to the outside.

  In such a configuration, the relative positional relationship between the light emitting portion 33 and the light emission passage hole 22a (the positional relationship between the two in the front-rear direction (the thickness of the shielding resin layer 32 and the shielding member 22), and the lateral direction of the both Positional relationship, the opening diameter of the light emission passage hole 22a, the position of the side surface 23a and the intermediate surface 23b of the window member 23 in the arrangement direction of the light emitting portion 33 and the light receiving portion 34, the height of the side surface 23a and the intermediate surface 23b, the window member It can be obtained by adjusting one or more of the conditions such as the thickness 23 and the inclination angle of the intermediate surface 23b.

  If the positional relationship between the light emitting portion 33 and the light emission passage hole 22a in the front-rear direction is restricted due to the structure of the device to which the proximity sensor 11 is attached, the other conditions may be adjusted.

  In addition, the substrate 31, the shielding resin layer 32, the transmitting resin layers 35, 36, the shielding member 22 and the window member 23 described above can be formed of a conventionally used material such as a resin material.

(Operation of proximity sensor 11)
In the above configuration, the detection light 33a emitted from the light emitting unit 33 passes through the transmission resin layer 35, is restricted by the light emission passage hole 22a of the shielding member 22 and spreads, and enters the outer peripheral surface from the inside of the window member 23. Among these, the detection light 33a (indicated by a solid line in FIG. 1) incident on the side surface 23a of the window member 23 is totally reflected by the side surface 23a, and then enters the top surface 23c and exits from the top surface 23c. . The detection light 33a (indicated by a broken line in FIG. 1) incident on the intermediate surface 23b is similarly totally reflected by the intermediate surface 23b and then emitted from the top surface 23c to the outside. The detection light 33a that has entered the top surface 23c is emitted from the top surface 23c to the outside.

On the other hand, when an object to be detected exists near the proximity sensor 11, the detection light 33a emitted to the outside from the window member 23 is reflected by the object to be detected, and the inside of the window member 23 from the outer peripheral surface of the window member 23 The light beam passes through the light receiving passage hole 22b, passes through the light transmitting resin layer 36, and enters the light receiving unit 34.
Thereby, the proximity sensor 11 can detect the presence of an object near the proximity sensor 11.

(Advantages of proximity sensor 11)
In the proximity sensor 11, of the detection light 33a emitted by the light emitting unit 33, the detection light 33a incident on the side surface 23a and the intermediate surface 23b of the window member 23 is totally reflected by the side surface 23a and the intermediate surface 23b, respectively. The light is emitted from the surface 23c to the outside. The detection light 33a that has entered the top surface 23c is emitted from the top surface 23c to the outside. Therefore, in the proximity sensor 11, the detection light 33a reflected to the inside of the window member 23 on the outer peripheral surface of the window member 23 is prevented from entering the light receiving unit 34 without being emitted from the window member 23 to the outside. The occurrence of talk can be reduced.

  In addition, light incident on the side surface 23a and the intermediate surface 23b of the window member 23 is totally reflected by the side surface 23a and the intermediate surface 23b and is not emitted to the outside, so for example, a proximity sensor near the outside of the side surface 23a or the intermediate surface 23b Even when there is a case of the device to which 11 is attached, the occurrence of crosstalk due to the reflected light of the detection light 33 a from the case can be prevented.

Reference Example 2
Other reference examples of the present invention will be described below based on the drawings. In addition, about the member which has the same function as the member mentioned above for convenience of explanation, the same code | symbol is appended and the description is abbreviate | omitted.

(Configuration of proximity sensor 12)
FIG. 6 is a longitudinal sectional view showing the configuration of a proximity sensor according to another reference example of the present invention. The outline of the structure of each part of the proximity sensor 12 shown in FIG. 6 is as described above based on FIG. 2 to FIG. Hereinafter, portions of the proximity sensor 12 different from the proximity sensor 11 will be described.

  The proximity sensor 12 is miniaturized so that the detection light 33a emitted from the light emitting unit 33 is incident on the side surface 23a, the intermediate surface 23b and the top surface 23c of the window member 23. In detail, in the proximity sensor 12, compared with the proximity sensor 11, the side surface 23a and the intermediate surface 23b are long, and the top surface 23c is short. Accordingly, the light of the optical axis of the detection light 33a emitted by the light emitting unit 33 is incident on the intermediate surface 23b and emitted from the intermediate surface 23b to the outside. That is, the incident angle of the light to the intermediate surface 23b is smaller than the angle at which the light is totally reflected at the intermediate surface 23b, which is determined by the refractive index of the window member 23.

  Further, the thicknesses of the shielding resin layer 32 and the shielding member 22 of the proximity sensor 12 are thinner than the thicknesses of the shielding resin layer 32 and the shielding member 22 of the proximity sensor 11. Further, the center of the light emission passage hole 22 a of the shielding member 22 is offset from the center of the light emitting portion 33 to the outside in the direction in which the light emitting portion 33 and the light receiving portion 34 are aligned.

(Operation of proximity sensor 12)
The thicknesses of the shielding resin layer 32 and the shielding member 22 of the proximity sensor 12, the positional relationship between the center of the light emission passage hole 22a of the shielding member 22 and the center of the light emitting portion 33, and the height of the side surface 23a of the window member 23 are as described above. As a result, among the detection light 33a emitted by the light emitting unit 33, the detection light 33a (indicated by a two-dot chain line in FIG. 6) incident on the lower part of the side surface 23a of the window member 23 is directed to the side surface 23a. The incident angle is smaller than the total reflection incident angle, and the light is emitted from the side surface 23a to the outside. The detection light 33a (denoted by a broken line in FIG. 6) incident on the upper portion of the side surface 23a of the window member 23 has an incident angle to the side surface 23a equal to or more than the total reflection angle, and is totally reflected on the side surface 23a. The detection light 33a totally reflected on the side surface 23a is emitted from the intermediate surface 23b to the outside. That is, the intermediate surface 23 b is set to an inclination angle at which the incident angle of the detection light 33 a which is totally reflected by the side surface 23 a and incident is smaller than the incident angle at which the reflected light is totally reflected.

  On the other hand, among the detection light 33a emitted by the light emitting unit 33, the detection light 33a (indicated by a solid line in FIG. 6) incident on the intermediate surface 23b of the window member 23 and the detection light 33a incident on the top surface 23c The light is emitted to the outside from 23 b and the top surface 23 c.

(Advantages of proximity sensor 12)
In the proximity sensor 12, the detection light 33a that has entered the lower portion of the side surface 23a of the window member 23 is emitted from the side surface 23a to the outside. The detection light 33a incident on the upper portion of the side surface 23a of the window member 23 is totally reflected by the side surface 23a and then emitted from the intermediate surface 23b to the outside. The detection light 33a incident on the intermediate surface 23b of the window member 23 and the detection light 33a incident on the top surface 23c are emitted to the outside from the intermediate surface 23b and the top surface 23c. Therefore, in the proximity sensor 12, the detection light 33 a reflected to the inside of the window member 23 on the outer peripheral surface of the window member 23 is prevented from entering the light receiving unit 34 without exiting from the window member 23. The occurrence can be reduced.

  Further, in the proximity sensor 12, the detection light 33 a also emits to the outside from the lower part of the side surface 23 a of the window member 23. Therefore, the proximity sensor 12 has a wide detection area. Specifically, in a state where the proximity sensor 12 is also arranged to detect an object to be detected on the side of the window member 23, a state in which the object to be detected is close to the side of the window member 23 may be detected. it can.

  The configurations of the proximity sensors 11 and 12 shown in the above reference examples can be expressed as follows.

  A shielding member 22 is provided between the light emitting unit 33 and the window member 23 and the window member 23, and the shielding member 22 is a light emission passage hole 22a through which the detection light 33a from the shielding member 22 passes, and A straight line connecting the light emitting point of the light emitting portion 33 and the end of the light emitting hole 22a has the light receiving passage hole 22b through which incident light to the light receiving portion 34 passes, and the side surface 23a of the window member 23 The side surface 23a has at least a region in which the incident angle formed by the perpendicular line of the side surface 23a and the straight line at the first intersection point is larger than the total reflection angle determined by the refractive index of the window member 23 Further, a line extending from the first point to the central side surface (the top surface 23c or the intermediate surface 23b) of the window member 23 at the same angle as the incident angle across the perpendicular from the first point forms a perpendicular to the central side. Degrees so that a smaller angle than the total reflection angle, by adjusting the positions of the side surface 23a and the dimensions of the light emitting apertures 22a, the components of the proximity sensor is positioned. Thus, the detection light 33a emitted from the light emitting unit 33 is totally reflected by the side surface 23a, and the reflected light is not totally reflected by the central side surface (the top surface 23c and the intermediate surface 23b), thereby preventing crosstalk.

First Embodiment
Embodiments of the present invention will be described below based on the drawings. In addition, about the member which has the same function as the member mentioned above for convenience of explanation, the same code | symbol is appended and the description is abbreviate | omitted. Also in each of the following embodiments, the intermediate surface 23 b and the top surface 23 c are central side surfaces located closer to the center of the window member 23 than the side surfaces 23 a.

(Configuration of proximity sensor 13)
FIG. 7 is a longitudinal sectional view showing the configuration of the proximity sensor according to the embodiment of the present invention. The outline of the structure of each part of the proximity sensor 13 shown in FIG. 7 is as described above based on FIG. 2 to FIG. Hereinafter, portions of the proximity sensor 13 different from the proximity sensor 11 will be described.

The proximity sensor 13 is miniaturized so that the detection light 33a emitted from the light emitting unit 33 is incident on the side surface 23a, the intermediate surface 23b and the top surface 23c of the window member 23. In detail, the proximity sensor 13 has a thinner thickness of the window member 23, a shorter side surface 23a, a longer intermediate surface 23b, and a shorter top surface 23c, as compared with the proximity sensor 11. Accordingly, the light of the optical axis of the detection light 33a emitted by the light emitting unit 33 is incident on the intermediate surface 23b. The incident angle of the light to the intermediate surface 23b in this case is smaller than the angle at which the light is totally reflected at the intermediate surface 23b, which is determined by the refractive index of the window member 23.

  Further, the thicknesses of the shielding resin layer 32 and the shielding member 22 of the proximity sensor 13 are thinner than the thicknesses of the shielding resin layer 32 and the shielding member 22 of the proximity sensor 11. Further, the center of the light emission passage hole 22 a of the shielding member 22 is offset from the center of the light emitting portion 33 to the outside in the direction in which the light emitting portion 33 and the light receiving portion 34 are aligned.

(Operation of proximity sensor 13)
The thicknesses of the shielding resin layer 32 and the shielding member 22 of the proximity sensor 13, the positional relationship between the center of the light emission passage hole 22a of the shielding member 22 and the center of the light emitting portion 33, and the height of the side surface 23a of the window member 23 are as described above. Thus, among the detection light 33a emitted by the light emitting unit 33, the detection light 33a (indicated by a two-dot chain line in FIG. 7) incident on the side surface 23a of the window member 23 has an incident angle to the side surface 23a. Becomes smaller than the incident angle at which the light is totally reflected, and the light is emitted from the side surface 23a to the outside.

  Further, among the detection light 33a emitted by the light emitting unit 33, the detection light 33a (indicated by a solid line in FIG. 7) incident on the intermediate surface 23b of the window member 23 and the detection light 33a incident on the top surface 23c have incident angles Is smaller than the incident angle at which total reflection is performed, and the light is emitted from the intermediate surface 23 b and the top surface 23 c to the outside.

(Advantage of proximity sensor 13)
In the proximity sensor 13, the detection light 33a incident on the side surface 23a, the intermediate surface 23b and the top surface 23c of the window member 23 is emitted from the side surface 23a, the intermediate surface 23b and the top surface 23c to the outside without being totally reflected. Therefore, the detection light 33a reflected to the inside of the window member 23 on the outer peripheral surface of the window member 23 is prevented from entering the light receiving unit 34 without being emitted from the window member 23 to the outside, thereby reducing the occurrence of crosstalk. can do.

  Further, in the proximity sensor 13, the detection light 33 a is also emitted to the outside from the side surface 23 a of the window member 23. Therefore, the proximity sensor 13 has a wide detection area. Specifically, in a state where the proximity sensor 13 is also arranged to detect an object to be detected on the side of the window member 23, a state in which the object to be detected is close to the side of the window member 23 may be detected. it can.

Second Embodiment
Another embodiment of the present invention will be described below based on the drawings. In addition, about the member which has the same function as the member mentioned above for convenience of explanation, the same code | symbol is appended and the description is abbreviate | omitted.

(Configuration of proximity sensor 14)
FIG. 8 is a longitudinal sectional view showing the configuration of a proximity sensor according to another embodiment of the present invention. The outline of the structure of each part of the proximity sensor 14 shown in FIG. 8 is as described above based on FIG. 2 to FIG. Hereinafter, portions of the proximity sensor 14 different from the proximity sensor 11 will be described.

  The proximity sensor 14 is miniaturized as compared to the conventional proximity sensor 111. The proximity sensor 14 has a thickness of the window member 23 thinner than that of the proximity sensor 11, a short side surface 23a, a long intermediate surface 23b, and a short top surface 23c. Accordingly, the light of the optical axis of the detection light 33a emitted by the light emitting unit 33 is incident on the intermediate surface 23b.

Further, the thicknesses of the shielding resin layer 32 and the shielding member 22 of the proximity sensor 14 are thinner than the thicknesses of the shielding resin layer 32 and the shielding member 22 of the proximity sensor 11. Further, by adjusting the positional relationship between the light emitting portion 33 and the light emitting passage hole 22a of the shielding member 22 and the diameter of the light emitting passage hole 22a, the detection light 33a emitted by the light emitting portion 33 is directed to the side surface 23a of the window member 23. It does not inject, but it injects into the middle surface 23b and the top surface 23c. The incident angle of the detection light 33a to the intermediate surface 23b and the top surface 23c in this case is smaller than the incident angle at which the detection light 33a is totally reflected.

(Operation of proximity sensor 14)
The detection light 33a emitted from the light emitting unit 33 of the proximity sensor 14 does not enter the side surface 23a of the window member 23, but enters the intermediate surface 23b and the top surface 23c. In this case, the incident angle of the detection light 33a to the intermediate surface 23b and the top surface 23c is smaller than the incident angle at which the detection light 33a is totally reflected. Therefore, the detection light 33a incident on the intermediate surface 23b and the top surface 23c is emitted to the outside from the intermediate surface 23b and the top surface 23c.

(Advantage of proximity sensor 14)
In the proximity sensor 14, the detection light 33a emitted from the light emitting unit 33 does not enter the side surface 23a of the window member 23, but enters the intermediate surface 23b and the top surface 23c, and exits from the intermediate surface 23b and the top surface 23c to the outside Do. Therefore, the detection light 33a reflected to the inside of the window member 23 on the outer peripheral surface of the window member 23 is prevented from entering the light receiving unit 34 without being emitted from the window member 23, and the occurrence of crosstalk is reduced. Can.

  Further, in the proximity sensor 14, the detection light 33 a emitted from the light emitting unit 33 is not incident on the side surface 23 a of the window member 23, so a case of an apparatus in which the proximity sensor 11 is mounted is present near the outside of the side surface 23 a. Even in this case, the occurrence of crosstalk due to the reflected light of the detection light 33a from the housing can be prevented.

Third Embodiment
Further embodiments of the present invention will be described below.

  In the proximity sensors 11 and 12 described above, the outer peripheral surface of the window member 23 has a side surface 23a, an intermediate surface 23b, and a top surface 23c, and each is a flat surface. However, the shape of the outer peripheral surface of the window member 23 is not limited to this. For example, it may be configured to have a plurality of intermediate surfaces 23b having different inclination angles. Alternatively, it may be dome-shaped (each surface is a curved surface) in which the central side surface is formed by a convex curved surface. In this case, for example, a range corresponding to a tangent perpendicular to the bottom surface of the window member 23 circumscribing the dome shape is regarded as the side surface 23a, and a range corresponding to the tangent parallel to the bottom surface of the window member 23 is regarded as the top surface 23c. A range corresponding to a tangent connecting the tangent perpendicular to the bottom and the tangent parallel to the bottom may be regarded as the intermediate surface 23b.

[Summary]
In the proximity sensor according to aspect 1 of the present invention, the window member 23 is provided in front of the light emitting unit 33 and the light receiving unit 34, and the detection light 33a emitted from the light emitting unit 33 is emitted from the window member 23 to the outside In the proximity sensor in which the reflected light of the detection light 33 a from the object to be detected enters from the window member 23 and enters the light receiving unit 34, the window member 23 moves forward of the light emitting unit 33 and the light receiving unit 34 It has a projecting shape, and has, as an outer peripheral surface, a side surface 23a which rises forward from the light emitting portion 33 side, and a central side surface (intermediate surface 23b, top surface 23c) closer to the center of the window member 23 than the side surface 23a. The detection light 33a incident on the central side surface is emitted from the central side surface to the outside without being totally reflected by the central side surface.

According to the above configuration, the detection light 33 a emitted from the light emitting unit 33 is emitted from the window member 23 to the outside, while the reflected light of the detection light 33 a from the object to be detected is incident from the window member 23 to the light receiving unit 34. It will be incident. The window member 23 has a shape projecting forward of the light emitting unit 33 and the light receiving unit 34, and as the outer peripheral surface, the side surface 23a which rises from the light emitting unit 33 side and the center on the center side of the window member 23 than the side surface 23a. It has a side surface (intermediate surface 23b, top surface 23c). The detection light 33a incident on the central side surface is emitted from the central side surface to the outside without being totally reflected by the central side surface.

  Thereby, even if the central side surface is present in the incident area of the detection light 33a emitted from the light emitting unit 33 on the outer peripheral surface of the window member 23, the detection light 33a totally reflected on the central side surface is received It is possible to suppress the incident to the part 34 and to reduce the crosstalk.

  In the proximity sensor according to aspect 2 of the present invention, in the above aspect 1, the detection light 33a is incident on the side surface 23a and emitted from the side surface 23a to the outside without being totally reflected by the side surface 23a. ing.

  According to the above configuration, the detection light 33a emitted from the light emitting unit 33 and incident on the side surface 23a is emitted from the side surface 23a to the outside without being totally reflected by the side surface 23a.

  Thereby, the detection light 33a emitted from the light emitting unit 33 can be totally reflected on the outer peripheral surface of the window member 23, and can be prevented from being incident on the light receiving unit 34, and crosstalk can be reduced.

  In the proximity sensor according to aspect 3 of the present invention, in the above aspect 1, the detection light 33a is not incident on the side surface 23a but is incident only on the central side surface.

  According to the above configuration, the detection light 33a emitted from the light emitting unit 33 is not incident on the side surface 23a but is incident only on the central side surface, and is totally reflected from the central side surface without being totally reflected from the central side surface. Emit to

  Thereby, the detection light 33a emitted from the light emitting unit 33 can be totally reflected on the outer peripheral surface of the window member 23, and can be prevented from being incident on the light receiving unit 34, and crosstalk can be reduced.

  In the proximity sensor according to aspect 4 of the present invention, the shielding member 22 is provided between the light emitting portion 33 and the light receiving portion 34 and the window member 23 in any of the aspects 1 to 3, and the shielding member 22 The light emission passage hole 22a through which the detection light 33a from the light emission unit 33 passes and the light reception passage hole 22b through which the incident light 34a to the light reception unit 34 passes.

  According to the above configuration, the detection light 33a emitted from the light emitting unit 33 passes through the light emission passage hole 22a of the shielding member 22, enters the outer peripheral surface of the window member 23, and enters from the window member 23. The light 34 a passes through the light receiving passage 22 b and is incident on the light receiver 34.

  Thus, by adjusting the positional relationship between the light emitting portion 33 and the light emission passage hole 22a, the diameter of the light emission passage hole 22a, or the height of the side surface 23a, the incident region of the detection light 33a to the outer peripheral surface of the window member 23 is It can be easily set.

In the proximity sensor according to aspect 5 of the present invention, in the above aspect 1, a shielding member 22 is provided between the light emitting portion 33 and the light receiving portion 34 and the window member 23, and the shielding member 22 is the light emitting portion A light emission passage hole 22a through which the detection light 33a from 33 passes and a light reception passage hole 22b through which incident light to the light reception unit 34 passes, and the light emission point of the light emission unit 33 and the end of the light emission passage hole 22a From the total reflection angle determined by the refractive index of the window member 23 at the first point where the straight line connecting the parts intersects with the side surface 23a of the window member 23 The height of the side surface 23a is limited by the height at which the angle is also small, and a straight line extending from the light emitting point of the light emitting portion 33 to the central side surface (the top surface 23c, the intermediate surface 23b) and a vertical line of the central side surface Eggplant Degree is such that an angle smaller than the total reflection angle determined by the refractive index of the window member 23, the position of the center side is determined.

  According to the above configuration, the detection light 33a emitted from the light emitting portion 33 is emitted from the side surface 23a to the outside without being totally reflected by the side surface 23a of the window member 23. Further, the detection light 33a incident on the central side surface is emitted from the central side surface to the outside without being totally reflected. As a result, the detection light 33a emitted from the light emitting unit 33 can be totally reflected on the outer peripheral surface of the window member 23, and can be prevented from being incident on the light receiving unit 34, and crosstalk can be reduced.

  In the proximity sensor according to aspect 6 of the present invention, in the above aspect 1, a shielding member 22 is provided between the light emitting portion 33 and the light receiving portion 34 and the window member 23, and the shielding member 22 is the light emitting portion A light emission passage hole 22a through which the detection light 33a from 33 passes and a light reception passage hole 22b through which incident light to the light reception unit 34 passes, and the light emission point of the light emission unit 33 and the end of the light emission passage hole 22a And the height of the side face 23a is set so that a straight line connecting the light emitting part and the side face 23a of the window member 23 does not intersect with the side face 23a of the window member 23. The angle between the straight line extending from the point to the central side surface (the top surface 23c and the intermediate surface 23b) and the vertical line of the central side is smaller than the total reflection angle determined by the refractive index of the window member 23 Position of the serial center side is determined.

  According to the above configuration, the detection light 33a emitted from the light emitting unit 33 is not incident on the side surface 23a of the window member 23, but is incident only on the central side surface and emitted from the central side surface to the outside. As a result, the detection light 33a emitted from the light emitting unit 33 can be totally reflected on the outer peripheral surface of the window member 23, and can be prevented from being incident on the light receiving unit 34, and crosstalk can be reduced.

  The electronic device according to aspect 7 of the present invention includes the proximity sensor according to any one of aspects 1 to 6, so that the proximity sensor can perform a detection operation with less crosstalk.

  The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the claims. The present invention can be obtained by appropriately combining the technical means disclosed in the different embodiments. The embodiments are also included in the technical scope of the present invention. Furthermore, new technical features can be formed by combining the technical means disclosed in each of the embodiments.

11 to 14 Proximity sensor 21 Proximity sensor module 22 Shielding member 22a Light emission passage hole 22b Light reception passage hole 23 Window member 23a Side surface 23b Intermediate surface 23c Top surface 31 Substrate 32 Shielding resin layer 32a Light emitting portion placement region 32b Light receiving portion placement region 33 Light emitting portion 33a detection light 34 light receiving unit 35 transmission resin layer 36 transmission resin layer

Claims (3)

A window member is provided in front of the light emitting portion and the light receiving portion, and the detection light emitted from the light emitting portion is emitted from the window member to the outside, while the reflected light of the detection light from the detection object is incident from the window member In the proximity sensor that is incident on the light receiving unit,
The window member has a shape projecting forward of the light emitting unit and the light receiving unit, and as an outer peripheral surface, a side surface rising forward from the light emitting unit side, and a center side surface of the window member on the center side of the side surface Have
The detection light incident on the central side surface is configured to be emitted from the central side surface to the outside without being totally reflected by the central side surface ,
A shielding member is provided between the light emitting unit and the light receiving unit and the window member,
The shielding member has a light emission passage hole through which the detection light from the light emission unit passes, and a light reception passage hole through which incident light to the light reception unit passes.
At a first point where a straight line connecting a light emitting point of the light emitting portion and an end of the light emission passage hole intersects the side surface of the window member, an incident angle formed by a perpendicular of the side surface and the straight line is the window member The height of the side is limited to a height that is smaller than the total reflection angle determined by the refractive index of
The central side surface of the light emitting unit is formed such that an angle formed by a straight line extending from the light emitting point to the central side surface and a vertical line of the central side surface is smaller than a total reflection angle determined by the refractive index of the window member. A proximity sensor characterized in that the position is determined . A window member is provided in front of the light emitting portion and the light receiving portion, and the detection light emitted from the light emitting portion is emitted from the window member to the outside, while the reflected light of the detection light from the detection object is incident from the window member In the proximity sensor that is incident on the light receiving unit,
The window member has a shape projecting forward of the light emitting unit and the light receiving unit, and as an outer peripheral surface, a side surface rising forward from the light emitting unit side, and a center side surface of the window member on the center side of the side surface Have
The detection light incident on the central side surface is configured to be emitted from the central side surface to the outside without being totally reflected by the central side surface,
A shielding member is provided between the light emitting unit and the light receiving unit and the window member,
The shielding member has a light emission passage hole through which the detection light from the light emission unit passes, and a light reception passage hole through which incident light to the light reception unit passes.
The size of the opening of the light emission passage hole and the height of the side surface are set so that a straight line connecting the light emission point of the light emission unit and the end of the light emission passage hole does not intersect the side surface of the window member. And
The central side surface of the light emitting unit is formed such that an angle formed by a straight line extending from the light emitting point to the central side surface and a vertical line of the central side surface is smaller than a total reflection angle determined by the refractive index of the window member. A proximity sensor characterized in that the position is determined. Electronic apparatus, characterized in that it comprises a proximity sensor according to claim 1 or 2.

Images