JP2019191026A - Optical sensor and electronic apparatus - Google Patents

Abstract

Provided is an optical sensor capable of improving detection accuracy. An optical sensor includes a light emitting element that emits light toward a detection target, a light receiving element that receives reflected light, and a housing that houses the light emitting element and the light receiving element. Prepare The light receiving element 20 includes a first light receiving section 21 which detects the reflected light from the panel 60 provided facing the light emitting element 10 with the origin as a reference, and a second light receiving section which detects the reflected light from the detection object 70 as signal light. And a light receiving section 22. In the case 40, the light emitting element 10 and the light receiving element 20 are optically separated. [Selection diagram] Figure 1

Description

  The present invention relates to an optical sensor and an electronic device that measure a flight time of light.

  2. Description of the Related Art Conventionally, in a mobile phone terminal such as a smartphone, a proximity sensor that detects the amount of reflected light is provided on the front side having a display screen for the purpose of turning off the screen during a call (see, for example, Patent Document 1). In recent years, in order to perform face authentication and iris authentication, a form in which a TOF (Time Of Flight) sensor capable of detecting a long distance by detecting an object from light propagation time is replaced with a proximity sensor has been spreading. (For example, refer to Patent Document 2 and Patent Document 3).

JP 2017-126686 A International Publication No. 2017/094279 JP 2014-142283 A

  The proximity sensor described in Patent Document 1 includes a light emitting unit and a first light receiving unit that detects whether light has returned, and the first light receiving unit has enhanced directivity in a direction perpendicular to the light receiving surface. ing. The proximity sensor radiates light from the light emitting part through an opening window (corresponding to a smartphone panel) which is a translucent member, and reflects light reflected from the opening window and reflected light from the detection target. In order to detect them separately, a slit for selectively guiding light is provided. In the proximity sensor, the detection distance is calculated from the magnitude of the reflected light amount from the detection target. However, since the light amount separation only by the slit is incomplete, the light receiving circuit performs subtraction processing to detect the signal. In the light quantity detection described above, accurate distance detection cannot be performed due to the influence of the reflectance of the object, and the cost of providing a slit is also necessary.

  The optical sensor described in Patent Document 2 is a light emitting element that emits light toward an object to be detected, and an optical member that transmits part of the light emitted from the light emitting element and reflects the other part of the light. And a light receiving element having a first light receiving portion and a second light receiving portion that receive the reflected light, and a reflected light guide member that reflects the reflected light from the optical member and guides it to the second light receiving portion.

  FIG. 10 is a schematic configuration diagram schematically showing a conventional optical sensor.

  The optical sensor 201 includes a light emitting element 211, an emission side window glass 212, an incident side window glass 213, a light receiving element 214, a substrate 215, and a lid 216. The light emitting element 211 and the light receiving element 214 are mounted on the substrate 215 so as to be adjacent to each other. The exit side window glass 212 is disposed on the optical path between the light emitting element 211 and the object 250 to be detected. The light receiving element 214 includes a first light receiving unit 214a that receives reflected light from the detection object 250 and a second light receiving unit 214b. The reflected light from the detection object 250 enters the first light receiving part 214a through the incident side window glass 213. Of the light emitted from the light emitting element 211, the light reflected without passing through the emission side window glass 212 is further reflected a plurality of times and enters the second light receiving unit 214b. The substrate 215 is formed in a flat plate shape, and the lid 216 is attached to the upper surface of the substrate 215 and covers most of the upper surface of the substrate 215. The exit side window glass 212 and the entrance side window glass 213 are attached to the lid 216 according to the positions of the light emitting element 211 and the light receiving element 214. The lid 216 includes a partition wall 216a that is a part of the upper surface of the light receiving element 214 and abuts on a portion between the first light receiving portion 214a and the second light receiving portion 214b. As a result, the first light guide 231 through which the reflected light from the detection object 250 toward the first light receiving part 214a passes and the reflected light from the emission side window glass 212 toward the second light receiving part 214b pass through the optical sensor 201. 2 light guides 232 are provided. That is, the lid 216 and the substrate 215 correspond to the reflected light guide member.

  In the optical sensor 201 described above, the first light receiving portion 214a and the second light receiving portion 214b provided in the same light receiving element 214 are separated by the partition wall portion 216a, but the light receiving element 214 itself is separated. However, there is a risk of light leaking. The reflected light guide member is provided with a first light guide 231 through which light traveling toward the first light receiving unit 214a passes and a second light guide 232 through which light traveling toward the second light receiving unit 214b passes. The first light guide 231 and the second light guide 232 must be separated. And since the shape of a reflected light guide member is determined according to the positional relationship of the light emitting element 211 and the light receiving element 214, there exists a subject that arrangement | positioning of each part is restrict | limited.

  The water droplet detection device described in Patent Document 3 includes a light emitting member that makes a pulse light substantially perpendicularly incident on a reflecting member provided on the inner surface of the glass, a reference light receiving member that receives the pulse light reflected substantially vertically by the reflecting member, and A detection light-receiving member that receives pulsed light that is substantially vertically reflected by glass, and a phase comparison unit that compares the phases of output signals from the reference light-receiving member and the detection light-receiving member are provided. In the water droplet detection apparatus described above, a light emitting member is provided between the reference light receiving member and the detection light receiving member to separate them. In the TOF sensor, in order to cope with the speed of light, time resolution in a minute unit (for example, picosecond order) is required. However, if the light receiving member is separated, the processing circuit for calculating the distance requires time resolution on the order of picoseconds, but a large time delay error occurs due to the parasitic capacitance caused by the wiring necessary for connecting the members. There is a problem that it ends up.

  SUMMARY An advantage of some aspects of the invention is that it provides an optical sensor and an electronic device that can improve detection accuracy.

  An optical sensor according to the present invention includes a light emitting element that emits light toward an object to be detected, a light receiving element that receives reflected light, and a housing that houses the light emitting element and the light receiving element. An optical sensor for measuring time, wherein the light receiving element includes a first light receiving unit that detects reflected light from a panel provided facing the light emitting element as a reference, and reflected light from the detection target. And a light receiving element that is optically separated from each other and mounted.

  In the optical sensor according to the present invention, the housing may have a configuration in which a light shielding portion that blocks light is provided between the light emitting element and the light receiving element.

  In the optical sensor according to the present invention, the second light receiving unit may be disposed closer to the light emitting element than the first light receiving unit.

  In the optical sensor according to the present invention, the housing may have a light receiving opening that opens directly above the second light receiving portion.

  In the optical sensor according to the present invention, the second light receiving unit may be disposed farther than the first light receiving unit with respect to the light emitting element.

  In the optical sensor according to the present invention, the first light receiving unit may be divided into a plurality of light receiving regions, and among the plurality of light receiving regions, a light receiving region reflected in a detection result may be set in advance. .

  The optical sensor according to the present invention may include a histogram circuit that detects a time distribution of the reflected light, and may output a distance from the detection object based on a detection result of the histogram circuit.

  In the optical sensor according to the present invention, the histogram circuit may be configured to select a component of the reflected light as a reference for the origin based on a peak value in the time distribution of the reflected light.

  An electronic apparatus according to the present invention includes the optical sensor according to the present invention.

  The electronic apparatus according to the present invention may include a panel provided to face the optical sensor, and the panel may include a light receiving window that transmits light.

  According to the present invention, since the light emitted from the light emitting element is prevented from directly entering the light receiving element, the panel surface can be the origin by using the reflected light from the panel as the origin reference, Detection accuracy can be improved.

1 is a schematic cross-sectional view schematically showing an optical sensor according to a first embodiment of the present invention. It is a circuit diagram which shows the avalanche photodiode connected so that it might become Geiger mode. It is a schematic cross section which shows typically the optical sensor which concerns on 2nd Embodiment of this invention. FIG. 4 is a schematic top view of the photosensor shown in FIG. 3. It is a schematic top view which shows the 1st light-receiving part which has a some light reception area | region. It is a block diagram which shows schematic structure of an optical sensor. It is a block diagram which shows the modification of schematic structure of an optical sensor. It is a characteristic view which shows an example of the time histogram of a received light signal. FIG. 9 is a characteristic diagram illustrating a state where an origin reference is selected in the time histogram of FIG. 8. It is a schematic block diagram which shows the conventional optical sensor typically.

(First embodiment)
Hereinafter, an optical sensor according to a first embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic cross-sectional view schematically showing an optical sensor according to the first embodiment of the present invention.

  The optical sensor 1 according to the first embodiment of the present invention includes a light emitting element 10, a light receiving element 20, a substrate 30, and a housing 40. FIG. 1 schematically shows a cross section of the optical sensor 1, and hatching is omitted in consideration of easy viewing of the drawing.

  The light emitting element 10 is mounted on the upper surface (front side of the optical sensor 1) of the substrate 30 and emits light (emitted light L1 in FIG. 1) toward the detection target. The light emitting element 10 is, for example, a VCSEL (surface emitting laser) or an LED (light emitting diode). In the present embodiment, the wire 11 for electrically connecting the light emitting element 10 and the substrate 30 is provided, but a connection may be made without providing the wire 11.

  The light receiving element 20 is mounted on the upper surface of the substrate 30 so as to be separated from the light emitting element 10 in the lateral direction A along the upper surface of the substrate 30. The light receiving element 20 includes a first light receiving unit 21 that detects reflected light from the panel 60 provided facing the light emitting element 10 (reference reflected light L2 in FIG. 1) as an origin reference, and a detection target 70. And a second light receiving unit 22 that detects the reflected light (detected reflected light L3 in FIG. 1) as signal light. The light receiving element 20 is, for example, an avalanche photodiode that is highly sensitive to light.

  The housing 40 covers a part of the front side of the optical sensor 1 so as to accommodate the light emitting element 10 and the light receiving element 20. In the present embodiment, the light emitting element 10 is covered with a light emitting sealing portion 51 formed of a transparent resin (translucent resin), and the light receiving element 20 is a light receiving sealing portion 52 formed of a transparent resin. Covered with. By the light emitting sealing portion 51 and the light receiving sealing portion 52, secondary molding is performed with the housing 40 formed of black resin (light-shielding resin) with respect to the state where the light emitting element 10 and the light receiving element 20 are primarily molded. Thus, the light emitting element 10 and the light receiving element 20 are optically separated.

  A portion of the housing 40 that is provided between the light emitting element 10 and the light receiving element 20 is a light shielding portion 41 that blocks light. Thus, by providing the light shielding part 41 and separating the light emitting element 10 and the light receiving element 20, light leakage can be reliably prevented.

  The housing 40 is provided with a light emitting opening 42 that exposes a part of the light emitting sealing portion 51 (particularly immediately above the light emitting element 10), and the emitted light L <b> 1 passes through the light emitting opening 42. It is emitted to the outside. In addition, the housing 40 is provided with a light receiving opening 43 that exposes a part of the light receiving sealing portion 52 (particularly, directly above the first light receiving portion 21 and the second light receiving portion 22). The light L <b> 2 and the detected reflected light L <b> 3 enter the light receiving element 20 through the light receiving opening 43.

  In the configuration shown in FIG. 1, the second light receiving unit 22 is disposed farther than the first light receiving unit 21 with respect to the light emitting element 10. As described above, by disposing the second light receiving unit 22 as far as possible from the light emitting element 10, it is possible to reduce the possibility that unintended light enters the second light receiving unit 22.

  The optical sensor 1 according to the present embodiment is housed inside an electronic device such as a smartphone, a robot cleaner, and a sanitary device, and is provided with a panel 60 that faces the front side. The panel 60 is provided with a light receiving window 61 that transmits the outgoing light L1 and reflects a part thereof. The light receiving window 61 is located at a portion facing the light emitting opening 42 and the light receiving opening 43. Hereinafter, for the sake of explanation, the direction in which the optical sensor 1 and the panel 60 face each other may be referred to as an irradiation direction B. When the detection target 70 is present at a position facing in the irradiation direction B, the optical sensor 1 measures the flight time of light and calculates the distance to the detection target 70.

  In practical examples in optical communication and time-of-flight measurement, avalanche photodiodes are used because weak light is detected at high speed using the avalanche amplification (avalanche) effect of photodiodes. When the avalanche photodiode is operated at a breakdown voltage (breakdown voltage) or lower with respect to the reverse bias voltage, the avalanche photodiode is in a linear mode in which the output current fluctuates following the amount of received light. . An avalanche photodiode in the Geiger mode is called a single photon avalanche diode (SPAD) because an avalanche phenomenon occurs even when a single photon is incident and a large output current can be obtained.

  Next, a circuit when the avalanche photodiode is used in the Geiger mode will be described with reference to the drawings.

  FIG. 2 is a circuit diagram showing an avalanche photodiode connected in a Geiger mode.

  An avalanche photodiode (hereinafter abbreviated as a photodiode 81) is connected in series to a quenching resistor 82. The gate of the transistor 83 is connected between the photodiode 81 and the quenching resistor 82. When a certain current or more flows through the photodiode 81, the voltage applied to the photodiode 81 decreases, and the avalanche phenomenon stops.

  The first light receiving unit 21 and the second light receiving unit 22 can operate at high speed by using the circuit described above. In the optical sensor 1, the detection timing at the first light receiving unit 21 is set as a starting point (origin reference), and the time t until the second light receiving unit 22 detects the distance L to the detection target 70 is expressed as “L = C (speed of light) × t ÷ 2 ”. The detection method using the optical sensor 1 will be described in detail with reference to FIG.

  As described above, since the light emitted from the light emitting element 10 is prevented from directly entering the light receiving element 20, the reflected light from the panel 60 is used as a reference for the origin so that the panel surface is the origin. And detection accuracy can be improved. That is, since the light-emitting element 10 and the light-receiving element 20 are optically reliably blocked, an avalanche photodiode can be employed for the light-receiving element 20 without fear of erroneous detection.

(Second Embodiment)
Next, an optical sensor according to a second embodiment of the present invention will be described with reference to the drawings.

  FIG. 3 is a schematic cross-sectional view schematically showing an optical sensor according to the second embodiment of the present invention, and FIG. 4 is a schematic top view of the optical sensor shown in FIG.

  In 2nd Embodiment, arrangement | positioning in the light receiving element 20 differs with respect to 1st Embodiment. Specifically, the second light receiving unit 22 is disposed closer to the light emitting element 10 than the first light receiving unit 21. That is, in the second embodiment, the positions of the first light receiving unit 21 and the second light receiving unit 22 are interchanged with respect to the first embodiment. The optical sensor 1 can measure the flight time more accurately by detecting the signal light with high accuracy. Therefore, by making the light emitting element 10 and the second light receiving unit 22 as close as possible, the inclination of the light incident on the second light receiving unit 22 can be reduced and light can be received efficiently.

  Further, in the present embodiment, the light receiving opening 43 is mainly provided so as to expose the immediately upper portion of the second light receiving portion 22, and the width of the opening is horizontal compared to the first embodiment. Narrow in direction A. As the light receiving opening 43 is narrowed, the light receiving window 61 of the panel 60 is also narrowed in the lateral direction A. As described above, since the first light receiving unit 21 is covered with the light-shielding material, the erroneous operation due to the incidence of disturbance light can be reduced.

  About the 2nd light-receiving part 22, it is preferable that it is set as the structure where the reflected light (detection reflected light L3) from the detection target 70 which exists far in the irradiation direction B is easy to inject, and the upper part is exposed. It is preferable. On the other hand, in the 1st light-receiving part 21, the reflected light (reference | standard reflected light L2) from the panel 60 (especially the light-receiving window 61) which exists in the irradiation direction B should just inject. That is, since the reference reflected light L2 is reflected light on the panel 60 that exists in the vicinity of the detection target 70, even if it is inclined with respect to the irradiation direction B from the detected reflected light L3, it passes through the light receiving opening 43, The light enters the first light receiving unit 21.

  In the panel 60, since the light receiving window 61 is formed of a material that transmits light (for example, infrared light), the color may be different from the panel 60 as a whole. Therefore, by making the light receiving window 61 as small as possible, it can be made inconspicuous and the design can be improved.

  Next, a modified example in which the first light receiving unit 21 is provided with a plurality of light receiving regions ZR will be described with reference to the drawings.

  FIG. 5 is a schematic top view showing a first light receiving unit having a plurality of light receiving regions.

  The first light receiving unit 21 in the modification is divided into a plurality of light receiving regions ZR. Although FIG. 5 shows a configuration divided into six light receiving regions ZR, the present invention is not limited to this, and the number of divisions may be changed, or the size may be different in each light receiving region ZR. Among the plurality of light receiving areas ZR, the light receiving area ZR reflected in the detection result is set in advance by the user. Any one or a plurality of light receiving regions ZR reflected in the detection result may be selected. According to this configuration, by providing a plurality of light receiving regions ZR in the first light receiving unit 21, it is possible to appropriately set so that an appropriate light receiving region ZR is selected. In other words, the optical sensor 1 can detect the reflected light appropriately by selecting the light receiving region ZR at the optimum position, because the positional relationship with respect to the panel 60 or the like varies depending on the product to be attached. Moreover, the light quantity required for the detection of reflected light can be obtained by setting together the some light reception area | region ZR.

(Block Diagram)
Next, a schematic configuration of the optical sensor 1 will be described with reference to FIG.

  FIG. 6 is a block diagram showing a schematic configuration of the optical sensor.

  At the subsequent stage of the high voltage source circuit 101, a detection side light receiving array unit 102A and a reference side light receiving array unit 102B are provided in parallel. The detection-side light receiving array unit 102 </ b> A corresponds to the second light receiving unit 22, and the reference-side light receiving array unit 102 </ b> B corresponds to the first light receiving unit 21. A detection-side array connection portion 103A is provided downstream of the detection-side light reception array portion 102A, and a reference-side array connection portion 103B is provided downstream of the reference-side light reception array portion 102B. A delay-lock loop circuit 106 and a detection-side pulse counter circuit 107A are provided in parallel at the subsequent stage of the detection-side array connection unit 103A. Further, a delay locked loop circuit 106 and a reference side pulse counter circuit 107B are provided in parallel at the subsequent stage of the reference side array connection section 103B. That is, the delay lock loop circuit 106 is connected to both the detection-side array connection unit 103A and the reference-side array connection unit 103B, and the range counter circuit 108 is provided in the subsequent stage. The delay lock loop circuit 106 and the range counter circuit 108 are connected to the transmitter 104 via the phase lock loop circuit 105. Further, an I2C circuit 109 is provided following the detection side pulse counter circuit 107A, the reference side pulse counter circuit 107B, and the range counter circuit 108. An input / output circuit 112 is provided following the I2C circuit 109, and the input / output terminal 112 is connected to the terminal path 120. In FIG. 6, the number of input / output terminals ST is one. However, the present invention is not limited to this, and a plurality of contacts with the terminal path 120 may be provided in accordance with signals input / output from the input / output circuit 112. Good.

  An emitter driver 110 is connected to the terminal path 120 via a first emitter terminal ET1, a second emitter terminal ET2, a third emitter terminal ET3, and a fourth emitter terminal ET4. The anode terminal of the light emitting element 111 (corresponding to the light emitting element 10 in FIG. 1) is connected to the second emitter terminal ET2, and the cathode terminal of the light emitting element 111 is connected to the third emitter terminal ET3. The terminal path 120 is provided with a power supply terminal VT and a ground terminal GT.

  In the optical sensor 1, the light emitting element 111 is pulse-driven by the emitter driver 110. The optical signal emitted from the light emitting element 111 is received by the detection side light receiving array unit 102A and the reference side light receiving array unit 102B to which a high voltage is applied. Here, the time difference between the detection signal of the detection-side light-receiving array unit 102A and the detection signal of the reference-side light-receiving array unit 102B is averaged by the delay lock loop circuit 106 for approximately 10,000 pulses. Thereafter, the number of pulse signals depending on the time difference is detected by the range counter circuit 108 and output as a distance value by the I2C circuit 109. Thus, since the distance value is calculated by comparing the detection signal of the detection-side light-receiving array unit 102A and the detection signal of the reference-side light-receiving array unit 102B, the detection-side light-receiving array unit 102A and the reference-side light-receiving array unit 102B With the same characteristics, it becomes easy to achieve consistency of the detection signal.

  Next, a modification of the schematic configuration of the optical sensor 1 will be described with reference to FIG.

  FIG. 7 is a block diagram showing a modification of the schematic configuration of the optical sensor.

  In the modification, the configuration from the detection side array connection unit 103A and the reference side array connection unit 103B to the I2C circuit 109 is different from the configuration shown in FIG. Specifically, a first TDC (Time to Digital Converter) circuit 113A and a second TDC circuit 113B are provided in parallel at the subsequent stage of the detection-side array connection unit 103A. Further, a first TDC circuit 113A and a second TDC circuit 113B are provided in parallel at the subsequent stage of the reference side array connection unit 103B. That is, the detection signal of the detection-side light receiving array unit 102A and the detection signal of the reference-side light receiving array unit 102B are input to the first TDC circuit 113A and the second TDC circuit 113B, respectively. A multiplexer 114 (MUX) is provided at the subsequent stage of the first TDC circuit 113A and the second TDC circuit 113B. A histogram circuit 115, a distance calculation circuit 116, and an I2C circuit 109 are sequentially connected to the subsequent stage of the multiplexer 114.

  In the modification, the first TDC circuit 113A and the second TDC circuit 113B detect the time difference between the detection signal of the detection-side light-receiving array unit 102A and the detection signal of the reference-side light-receiving array unit 102B. Output as a highly accurate distance value. In the method shown in FIG. 6, all average outputs of detection signals are obtained. In the modification, for example, a plurality of positions can be detected at a position where the amount of reflected light is large.

  FIG. 8 is a characteristic diagram showing an example of a time histogram of the received light signal.

  In FIG. 8, the horizontal axis indicates the passage of time, the vertical axis indicates the number of detected pulses, and is a graph showing the fluctuation of the number of detected pulses in the second light receiving unit 22 with the passage of time. Since some disturbance light is incident on the optical sensor 1, a certain number of pulses are always detected (corresponding to the disturbance light component BS). In the time histogram shown in FIG. 8, there are three peaks where the number of detected pulses is greater than the disturbance light component BS. The first reflected light component HS1 confirmed at the earliest time has a detection pulse number of less than 200, and the second reflected light component HS2 confirmed at the earliest time has a detection pulse number of less than 400. The third reflected light component HS3 confirmed at the latest time has about 150 detection pulses. Of the three peaks, the first reflected light component HS1 corresponds to the multiple reflected light component incident after the regular reflection component on the panel 60. What is necessary is just to discriminate | determine whether it is the reflected light in the detection target object 70 or the multiple reflected light in the panel 60 by the time when the pulse was detected, etc.

  As described above, the configuration shown in FIG. 7 includes the histogram circuit 115 that detects the time distribution of the reflected light, and outputs the distance from the detection object based on the detection result of the histogram circuit 115. In this way, a more accurate result can be output by detecting the time distribution of the reflected light. That is, even when reflected light from a plurality of objects is received, the distance can be individually output based on the time of receiving each.

  Further, the histogram circuit 115 may select a component of reflected light as a reference for the origin based on the peak value in the time distribution of the reflected light. Next, with respect to the time histogram, processing when selecting a reflected light component as the origin reference will be described with reference to the drawings.

  FIG. 9 is a characteristic diagram showing a state in which the origin reference is selected in the time histogram of FIG.

  The histogram circuit 115 uses the first reflected light component HS1 as a reference for the time histogram shown in FIG. As a result, processing is performed to output a distance value based on the peaks detected after the first reflected light component HS1, and the first reflected light component HS1 is calculated when the distance value is calculated as shown in FIG. Ignored. As described above, not only light directly reflected by the object but also light unnecessary for distance measurement, such as light delayed by multiple reflections, may enter the light receiving element 20. Therefore, by setting an appropriate reflected light component based on the origin based on the peak value in the time distribution, unnecessary components can be ignored and erroneous measurement can be avoided.

  It should be noted that the embodiment disclosed herein is illustrative in all respects and does not serve as a basis for limited interpretation. Therefore, the technical scope of the present invention is not interpreted only by the above-described embodiment, but is defined based on the description of the scope of claims. Moreover, all the changes within the meaning and range equivalent to a claim are included.

DESCRIPTION OF SYMBOLS 1 Optical sensor 10 Light emitting element 11 Wire 20 Light receiving element 21 1st light-receiving part 22 2nd light-receiving part 30 Board | substrate 40 Case 41 Light-shielding part 42 Light-emitting opening part 43 Light-receiving opening part 51 Light-emitting sealing part 52 Light-receiving sealing part 60 Panel 61 Light receiving window 70 Object to be detected A Horizontal direction B Irradiation direction

Claims (10)

A light emitting element that emits light toward the detection target;
A light receiving element for receiving the reflected light;
An optical sensor comprising a housing for housing the light emitting element and the light receiving element, and measuring a flight time of light,
The light receiving element includes a first light receiving unit that detects reflected light from a panel provided facing the light emitting element with reference to an origin, and a second light receiving unit that detects reflected light from the detection object as signal light. And
The light sensor, wherein the light receiving element and the light receiving element are optically separated and mounted. The optical sensor according to claim 1,
The optical sensor according to claim 1, wherein the casing is provided with a light blocking portion that blocks light between the light emitting element and the light receiving element. The optical sensor according to claim 1 or 2,
The second light receiving unit is disposed closer to the light emitting element than the first light receiving unit. The optical sensor according to claim 3,
The optical sensor according to claim 1, wherein the housing includes a light receiving opening having an opening directly above the second light receiving portion. The optical sensor according to claim 1 or 2,
The second light receiving unit is disposed farther than the first light receiving unit with respect to the light emitting element. An optical sensor according to any one of claims 1 to 5,
The first light receiving unit is divided into a plurality of light receiving regions, and among the plurality of light receiving regions, a light receiving region that reflects a detection result is set in advance. An optical sensor according to any one of claims 1 to 6,
A histogram circuit for detecting a time distribution of the reflected light;
An optical sensor that outputs a distance from the detection target based on a detection result of the histogram circuit. The optical sensor according to claim 7,
The optical sensor, wherein the histogram circuit selects a reflected light component based on an origin based on a peak value in a time distribution of the reflected light.   The electronic device provided with the optical sensor of any one of Claim 1- Claim 8. The electronic device according to claim 9,
A panel provided opposite to the photosensor;
The panel includes a light receiving window that transmits light.

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