WO2016017258A1 - センサ、センサ装置、および電子機器 - Google Patents
センサ、センサ装置、および電子機器 Download PDFInfo
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- WO2016017258A1 WO2016017258A1 PCT/JP2015/065233 JP2015065233W WO2016017258A1 WO 2016017258 A1 WO2016017258 A1 WO 2016017258A1 JP 2015065233 W JP2015065233 W JP 2015065233W WO 2016017258 A1 WO2016017258 A1 WO 2016017258A1
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- 238000012545 processing Methods 0.000 claims description 18
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- 238000000034 method Methods 0.000 description 3
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- 102000001554 Hemoglobins Human genes 0.000 description 1
- 108010054147 Hemoglobins Proteins 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
- A61B5/024—Detecting, measuring or recording pulse rate or heart rate
- A61B5/02416—Detecting, measuring or recording pulse rate or heart rate using photoplethysmograph signals, e.g. generated by infrared radiation
- A61B5/02427—Details of sensor
- A61B5/02433—Details of sensor for infrared radiation
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
- A61B5/6801—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be attached to or worn on the body surface
- A61B5/6813—Specially adapted to be attached to a specific body part
- A61B5/6825—Hand
- A61B5/6826—Finger
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/72—Signal processing specially adapted for physiological signals or for diagnostic purposes
- A61B5/7225—Details of analog processing, e.g. isolation amplifier, gain or sensitivity adjustment, filtering, baseline or drift compensation
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/72—Signal processing specially adapted for physiological signals or for diagnostic purposes
- A61B5/7235—Details of waveform analysis
- A61B5/725—Details of waveform analysis using specific filters therefor, e.g. Kalman or adaptive filters
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
- A61B5/024—Detecting, measuring or recording pulse rate or heart rate
- A61B5/02438—Detecting, measuring or recording pulse rate or heart rate with portable devices, e.g. worn by the patient
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/12—Analogue/digital converters
- H03M1/50—Analogue/digital converters with intermediate conversion to time interval
- H03M1/52—Input signal integrated with linear return to datum
Definitions
- the present invention relates to a sensor including a proximity sensor and a proximity illuminance sensor, a sensor device including the sensor and a light emitting element that emits light including infrared light, and an electronic apparatus including the proximity sensor and the proximity illuminance sensor. Is.
- an illuminance sensor is desired to be mounted in order to adjust the light emission amount according to the illuminance of external light (disturbance light).
- a proximity sensor be mounted so that the display unit can be turned off when the user's face approaches.
- Patent Document 1 since reflected light reflected by a human fingertip changes according to blood flow, light emitted by a light emitting diode is received by a photodiode, and the reflected light is reflected.
- the method of detecting the vein was used by detecting the change of the.
- Patent Document 2 discloses detecting a pulse using an integration type analog-digital conversion circuit.
- FIG. 15 shows an example of a conventional proximity illuminance sensor mounted on a mobile device such as a mobile phone or a smartphone.
- the proximity illuminance sensor 101 serves as a light-receiving element, an infrared light corresponding photodiode 102 having spectral characteristics in the infrared light region, and visible light to red having spectral properties in the visible light to infrared light region.
- analog-digital conversion circuits 104 and 105 for converting an input current, which is an analog value from each of the photodiodes 102 and 103, into a digital value.
- the function as the proximity sensor in the proximity illuminance sensor 101 is the same as the proximity sensor 107 described later, the description is omitted, and only the function as the illuminance sensor is described here.
- the current generated according to the amount of light received per unit time in the infrared light-corresponding photodiode 102 is defined as the input current 1 (Iin1), and the current generated according to the amount of light received per unit time in the visible light to infrared light-capable photodiode 103. Is the input current 2 (Iin2).
- the digital value output from the analog-digital conversion circuit 104 is ADCOUT1
- the input current 2 (Iin2) is converted by the analog-digital conversion circuit 105.
- the digital value output from the analog-digital conversion circuit 105 is ADCOUT2.
- the following illuminance result can be obtained as a digital value by performing an operation of multiplying ADCOUT1 by ⁇ and subtracting from ADCOUT2.
- FIG. 16 shows an example of a conventional proximity sensor mounted on a mobile device such as a mobile phone or a smartphone.
- the LED element 106 is a backlight that emits light including light of a predetermined wavelength received by the proximity sensor 107 and irradiates the display panel 109 with light in order to detect the degree of proximity of the detection object 110.
- the proximity sensor 107 includes a photodiode (not shown) as a light receiving element and an analog-digital conversion circuit (not shown).
- the lens 108 is provided on the photodiodes of the LED element 106 and the proximity sensor 107, and improves the light receiving efficiency and the light emitting efficiency.
- FIG. 17 shows an example of the control signal of the LED element shown in FIG. 16, the output value and the judgment value of the proximity sensor.
- FIG. 17A shows a case where the detection object 110 is close to the proximity sensor 107.
- the LED element 106 is caused to emit light
- the reflected light from the detection object 110 is large and the amount of light received by the photodiode of the proximity sensor 107 is also large. Therefore, the output value data of the proximity sensor 107 while the LED element 106 is in the light emission period is Data1
- the output value data of the proximity sensor 107 when the LED element 106 is in the non-light emission period is Data2.
- the difference between Data1 and Data2 is set as proximity data. If the proximity data is equal to or greater than a threshold value, it is determined that the detected object 110 is in a state of being in proximity to the proximity sensor 107 (proximity state). ing.
- FIG. 17B shows a case where the sensing object 110 is separated from the proximity sensor 107. Since the sensing object 110 is separated even when the LED element 106 is caused to emit light, the reflected light from the sensing object 110 is small, and the amount of light received by the photodiode of the proximity sensor 107 is also small. Therefore, the output value data of the proximity sensor 107 while the LED element 106 is in the light emission period is Data1, and the output value data of the proximity sensor 107 when the LED element 106 is in the non-light emission period is Data2. Then, the difference between Data1 and Data2 is set as proximity data, and since the proximity data is less than the threshold value, it is determined that the detection object 110 is in a state away from the proximity sensor 107 (non-proximity state). ing.
- the proximity illuminance sensor 101 and the proximity sensor 107 described above since it is determined whether or not the detected object is near the proximity illuminance sensor 101 or the proximity sensor 107, the detected object is near the proximity illuminance sensor 101 or the proximity sensor 107. Even if the output value of the analog-digital conversion circuit is saturated, the proximity determination of the detected object is not greatly affected.
- the output value of the analog-digital conversion circuit is saturated because the user's finger is measured close to the proximity illuminance sensor or proximity sensor. End up.
- An object of the present invention is to provide a sensor capable of detecting a user's pulse using a proximity illuminance sensor or a proximity sensor, a sensor device, and an electronic device.
- a sensor of the present invention includes a first light receiving element that receives infrared light, and an analog-to-digital conversion circuit that converts an analog output value of the first light receiving element into a digital output value.
- a sensor capable of detecting a user's pulse using a proximity illuminance sensor or a proximity sensor can be realized.
- a sensor device includes the sensor and a light emitting element that emits light including infrared light.
- a sensor device capable of detecting a user's pulse using a proximity illuminance sensor or a proximity sensor can be realized.
- an electronic device of the present invention includes a first light receiving element that receives infrared light, and an analog-to-digital conversion circuit that converts an analog output value of the first light receiving element into a digital output value.
- the digital output value is changed according to each value of the distance in at least a predetermined range of the distance between the first light receiving element and the sensing object.
- the digital output value is subjected to digital filter processing, and the period thereof is detected.
- an electronic device capable of detecting a user's pulse using a proximity illuminance sensor or a proximity sensor can be realized.
- a sensor that can detect a user's pulse using a proximity illuminance sensor or a proximity sensor, a sensor device, and an electronic device can be realized.
- FIG. 3 is a diagram illustrating an example of a drive signal of the analog-digital conversion circuit illustrated in FIG. 2. It is a figure which shows the output value from the analog-digital conversion circuit when the proximity illuminance sensor provided with the pulse detection function is used as the proximity sensor mode and when it is used as the pulse sensor mode.
- FIG. 1 It is a figure which shows schematic structure of the sensor apparatus provided with the infrared-light LED as a light emitting element, and the proximity sensor provided with the pulse detection function. It is a figure which shows schematic structure of the electronic device provided with infrared-light LED as a light emitting element, a proximity sensor, and CPU which performs a digital filter process. It is a figure which shows schematic structure of the light receiving element which can change spectral characteristics. It is a figure which shows schematic structure of the sensor apparatus provided with the infrared-light LED as a light emitting element, and the proximity illuminance sensor provided with the pulse detection function which has two light receiving elements which can change spectral characteristics.
- FIG. 17 shows an example of the control signal of the LED element shown in FIG. 16, the output value of the proximity sensor, and the determination value.
- FIGS. 1 to 14 Embodiments of the present invention will be described with reference to FIGS. 1 to 14 as follows.
- FIG. 1 is a diagram illustrating a schematic configuration of a sensor device 9 including an infrared LED 1 as a light emitting element and a proximity illuminance sensor 8 having a pulse detection function.
- the infrared light LED 1 is used as a light emitting element in consideration of the light receiving wavelength region of the proximity illuminance sensor 8 having a pulse detection function.
- the hemoglobin in the blood of the user's finger has a property of absorbing near infrared light well, and it is preferable to use a light emitting element that emits light including an infrared light region.
- Proximity illuminance sensor with pulse detection function As shown in FIG.
- a proximity illuminance sensor 8 having a pulse detection function includes, as a light receiving element, an infrared light-capable photodiode 2 having spectral characteristics in the infrared light region and a visible light to infrared light region. And a visible light to infrared light corresponding photodiode 3 having spectral characteristics.
- the proximity illuminance sensor 8 having a pulse detection function includes an analog-digital conversion circuit 4 for converting an input current that is an analog value from the photodiode 2 into a digital value, and a digital output value from the analog-digital conversion circuit 4.
- a count adjustment circuit 5 adjusts (ADCOUT1) so as to change according to each value of the distance in at least a predetermined range of the distance between the photodiode 2 and the sensing object (finger in the figure);
- a digital filter 6 for detecting the period of the digital output value (ADCOUT1) from the analog-digital conversion circuit 4, and an analog-digital conversion circuit 7 for converting the input current, which is an analog value from the photodiode 3, into a digital value.
- FIG. 2 is a diagram showing a schematic configuration of the integration type analog-digital conversion circuit and the count adjustment circuit.
- analog-digital conversion circuit 4 is an analog-digital conversion circuit that digitally converts the amount of input current and outputs it.
- a discharge circuit 11, a comparison circuit 12, and a control circuit 13 are analog-digital conversion circuits that digitally converts the amount of input current and outputs it.
- the charging circuit 10 includes a capacitor (C1) that stores electric charge according to an input current (Iin) from a photodiode 2 (not shown), and an operational amplifier (AMP1).
- C1 that stores electric charge according to an input current (Iin) from a photodiode 2 (not shown), and an operational amplifier (AMP1).
- the discharge circuit 11 is a circuit that discharges a predetermined amount of charge at a time via the switch 2 (SW2).
- the comparison circuit 12 opens and closes a comparator (CMP1) that compares the output voltage (vsig) of the charging circuit 10 with a reference voltage (vref) having a voltage V1, and the reference voltage (vref) and the output of the charging circuit 10 And a switch 1 (SW1).
- CMP1 comparator
- vref reference voltage
- SW1 switch 1
- the control circuit 13 includes a flip-flop (FF) and a counter, and outputs a digital value corresponding to the number of discharges of the discharge circuit 11 as an output value (ADCOUT1).
- FF flip-flop
- ADCOUT1 output value
- the count adjustment circuit 5 has a configuration similar to that of the discharge circuit 11, and is a circuit that discharges a predetermined amount of charge during the measurement period via the switch 3 (SW3), and has an offset value. Determines the number of discharges. That is, the switch 3 (SW3) becomes the Hi voltage for the number of times corresponding to the charge set by the offset, and the switch 3 (SW3) is closed and discharged at the Hi voltage.
- FIG. 3 is a diagram illustrating an example of a drive signal of the analog-digital conversion circuit 4 illustrated in FIG.
- the switch 1 (SW1) in the comparison circuit 12 is closed, the output voltage (vsig) of the charging circuit 10 is charged to the reference voltage (vref).
- the switch 1 (SW1) is opened, so that the input current (Iin) from the photodiode 2 (not shown) is charged to the capacitor (C1) of the charging circuit 10, and the analog ⁇ Digitally converted.
- the discharge circuit 11 performs a precharge operation for discharging a fixed charge (I1 ⁇ clock (t_clk)), and the output voltage (vsig) of the charging circuit 10 is lowered. Thereafter, the charging circuit 10 is charged by the input current (Iin) from the photodiode 2, and when the output voltage (vsig) of the charging circuit 10 exceeds the reference voltage (vref), the output value (comp) of the comparison circuit 12 is The control circuit 13 outputs a control signal (charge) for controlling the switch 2 (SW2) of the discharge circuit 11 one clock (t_clk) after the output value (comp) of the comparison circuit 12 becomes the Hi voltage. ) Is output.
- the amount of charge charged by the input current (Iin) from the photodiode 2 and the amount of charge discharged by I1 ⁇ clock (t_clk) are operated to be equal.
- the clock is t_clk
- the data charge time is t_conv
- the discharge time is counted
- the reference current amount is I1
- the charge charge amount is Iin ⁇ t_conv
- the discharge charge amount is I1 ⁇ t_clk ⁇ count.
- count (Iin ⁇ t_conv) / (I1 ⁇ t_clk) is established.
- the minimum resolution is determined by (I1 ⁇ t_clk).
- the count number (count) is a value corresponding to the input current Iin and is output in the range of 0 to 65535. Therefore, by providing such an analog-digital conversion circuit 4, analog-digital conversion with a wide dynamic range and high resolution becomes possible.
- the proximity illuminance sensor 8 shown in FIG. 1 includes an analog-digital conversion circuit 4 that is an integral type analog-digital conversion circuit, so that the proximity illuminance that can perform analog-digital conversion with a wide dynamic range and high resolution is possible.
- the sensor 8 can be realized.
- the analog-digital conversion circuit 4 of the proximity illuminance sensor 8 is provided with a counter adjustment circuit 5 (adjustment circuit) so that fluctuations in the pulse cycle can be easily detected.
- the count adjustment circuit 5 is a circuit that discharges a predetermined amount of charge during the measurement period via the switch 3 (SW3), and discharges according to an offset value. Since the number of times can be determined, the count of the output value (ADCOUT1) from the analog-digital conversion circuit 4 can be adjusted.
- count (Iin ⁇ t_conv) / (I1 ⁇ t_clk) ⁇ offset.
- count Iin / I1 ⁇ 2 n ⁇ offset, which is equal to the offset of the count number to be adjusted. The count can be shifted. Therefore, by using the count adjustment circuit 5, the output value (ADCOUT1) from the analog-digital conversion circuit 4 corresponds to each value of the distance in at least a predetermined range of the distance between the photodiode 2 and the sensing object. It can be adjusted to change.
- FIG. 4 shows an analog that changes depending on the distance between the photodiode 2 and the sensing object when the proximity illuminance sensor 8 having a pulse detection function is used as the proximity sensor mode and when it is used as the pulse sensor mode.
- FIG. 6 is a diagram showing an output value (ADCOUT1) from the digital conversion circuit 4;
- FIG. 4A shows a case where the proximity illuminance sensor 8 is used as a proximity sensor mode.
- the detection is performed for a distance of about 100 mm of a detection object.
- the output count which is an output value from the analog-digital conversion circuit 4 is saturated.
- the proximity sensor mode since it is only determined whether or not the detection object is near the photodiode 2, even if the output value of the analog-digital conversion circuit 4 is saturated, the detection object There is no significant effect on proximity determination.
- the output value of the analog-to-digital conversion circuit 4 is not saturated at a short distance of about 1 mm to 2 mm where the finger is placed. Must be set. At such a short distance of about 1 mm to 2 mm, the output value of the analog-digital conversion circuit 4 is generally saturated, but the proximity illuminance sensor 8 uses the count adjustment circuit 5 to output the analog-digital conversion circuit 4. The value is adjusted so as not to saturate in at least a predetermined range of the distance between the photodiode 2 and the detection object (for example, a short distance of about 1 mm to 1.6 mm where a finger is placed).
- FIG. 4B shows a case where the proximity illuminance sensor 8 is used as a pulse sensor mode.
- the analog-to-digital conversion circuit 4 has a short distance of about 1 mm to 1.6 mm where a finger is placed. Since the output value is not saturated, the pulse can be measured.
- the output value of the analog-to-digital conversion circuit 4 using the count adjustment circuit 5 is at least a predetermined range of the distance between the photodiode 2 and the sensing object (for example, a short distance of about 1 mm to 1.6 mm where a finger is placed) The reason why it can be used as the pulse sensor mode by adjusting so as not to saturate in) will be described.
- the photodiode 2 When the proximity illuminance sensor 8 is mounted on a portable device such as a smartphone, the photodiode 2 is generally provided at the lower part of the display panel or inside the display panel. Therefore, a gap is generated between the photodiode 2 and the surface of the display panel (contact surface of the user's finger). Therefore, even when the user's finger is completely in contact with the display panel, a distance of about 1 mm to 1.6 mm usually remains.
- the proximity illuminance sensor 8 uses the count adjustment circuit 5 so that the output value of the analog-digital conversion circuit 4 is at least a predetermined range of the distance between the photodiode 2 and the sensing object (for example, placing a finger) It is adjusted so as not to saturate at a short distance of about 1 mm to 1.6 mm) and used as a pulse sensor mode.
- the output of the analog / digital conversion circuit 4 is output using the count adjustment circuit 5. It is necessary to optimally adjust the value so as not to saturate at least in a predetermined range of the distance between the photodiode 2 and the sensing object, and to have a state where the count varies due to the pulse. (Light receiving element) FIG.
- FIG. 5 shows an infrared light compatible photodiode 2 having spectral characteristics in the infrared light region and a visible light to infrared light corresponding photodiode having spectral characteristics in the visible light to infrared light region provided in the proximity illuminance sensor 8.
- the proximity illuminance sensor 8 When the proximity illuminance sensor 8 operates as an illuminance sensor, the illuminance characteristics that match the visibility are subtracted from the output of the spectral characteristics of visible light to infrared light by multiplying the output of the spectral characteristics of infrared light by ⁇ . Can be realized.
- the proximity illuminance sensor 8 When the proximity illuminance sensor 8 operates as a proximity sensor, visible light can be reduced and noise such as a fluorescent lamp can be reduced by using the output of infrared spectral characteristics.
- FIG. 6 is a diagram for explaining the digital filter 4 provided in the proximity illuminance sensor 8.
- the digital filter 4 is an FIR (finite impulse response) filter, and includes a low-pass filter and a high-pass filter.
- the low pass filter can be configured with moving average processing, and the high pass filter can be configured with differential processing.
- FIG. 7 is a diagram showing pulse waveforms before and after processing the output value (ADCOUT1) of the analog-digital conversion circuit 4 using the digital filter 4 when the proximity illuminance sensor 8 is operated as a pulse sensor.
- FIGS. 7A and 7B show the pulse waveforms before and after the digital filter 4 processing in the case of the user A (person A).
- FIGS. 7C and 7D show the user B
- FIG. 7E and FIG. 7F show the pulse waveforms before and after the digital filter 4 processing in the case of the user C (person C). Is shown.
- the effect of a low-pass filter that smooths fine noise with a high frequency and the amount of reflected light by the user are reduced.
- the effect of a high-pass filter that removes the difference (DC level) can be obtained, and the pulse waveform after the digital filter 4 processing can obtain a pulse waveform having an amplitude centered at 0 regardless of the user. .
- the user's pulse cycle is detected. Can be easily detected.
- the digital filter 4 is an FIR (finite impulse response) filter
- the digital filter 4 may be an IIR (infinite impulse response) filter.
- FIG. 8 is a diagram illustrating an example of a digital filter configured with an IIR (infinite impulse response) filter.
- the sensor device including the proximity illuminance sensor having the pulse detection function has been described as an example.
- the proximity sensor having the pulse detection function is provided.
- the sensor device is different from the first embodiment in that the sensor device is described as an example.
- Other configurations are as described in the first embodiment.
- members having the same functions as those shown in the drawings of the first embodiment are given the same reference numerals, and descriptions thereof are omitted.
- FIG. 9 is a diagram showing a schematic configuration of a sensor device 15 including an infrared light LED 1 as a light emitting element and a proximity sensor 14 having a pulse detection function.
- the proximity sensor 14 having a pulse detection function includes an infrared light-capable photodiode 2 having spectral characteristics in an infrared light region, and an input current (Iin1) that is an analog value from the photodiode 2.
- a digital output value (ADCOUT1) from the analog-digital conversion circuit 4 is at least a predetermined range of the distance between the photodiode 2 and the sensing object (finger in the figure).
- the user's pulse can be detected using the proximity sensor.
- the pulse detection method in the proximity sensor 14 having the pulse detection function is as already described in the first embodiment, and the function as the proximity sensor has already been described with reference to FIGS. 16 and 17. Since they are as described above, their description is omitted here.
- the digital filter 6 that digitally processes the digital output value (ADCOUT1) from the analog-to-digital conversion circuit 4 is a proximity illuminance sensor having a pulse detection function or a proximity having a pulse detection function.
- the digital filter processing of the digital output value (ADCOUT1) from the analog-digital conversion circuit 4 is performed by software outside the proximity illuminance sensor or the proximity sensor. This is different from the above-described first and second embodiments in that it is processed automatically.
- Other configurations are as described in the first and second embodiments.
- members having the same functions as those shown in the drawings of Embodiments 1 and 2 are given the same reference numerals, and descriptions thereof are omitted.
- FIG. 10 is a diagram showing a schematic configuration of an electronic device 18 including an infrared LED 1 as a light emitting element, a proximity sensor 16, and a CPU.
- the proximity sensor 16 converts an infrared light-capable photodiode 2 having spectral characteristics in the infrared light region and an input current (Iin1) that is an analog value from the photodiode 2 into a digital value.
- the digital output value (ADCOUT1) from the analog-digital conversion circuit 4 for each of the above distances in at least a predetermined range of the distance between the photodiode 2 and the sensing object (finger in the figure)
- a count adjustment circuit 5 adjusts so as to change according to the value.
- the digital filter processing for detecting the cycle of the digital output value (ADCOUT1) from the analog-digital conversion circuit 4 is performed by software in the CPU of the electronic device 18.
- the electronic device 18 only needs to have a processing unit such as a CPU capable of performing digital filter processing, and examples thereof include a mobile phone, a smartphone, and a digital camera.
- a processing unit such as a CPU capable of performing digital filter processing
- examples thereof include a mobile phone, a smartphone, and a digital camera.
- An electronic device having such a configuration can detect a user's pulse using a proximity illuminance sensor or a proximity sensor, and by processing digital filter processing with software, the proximity illuminance sensor and proximity sensor can be analog digital. Since it can be configured up to the conversion circuit, the configuration is simple and low cost can be realized.
- Embodiment 4 Next, based on FIG. 11 and FIG. 12, Embodiment 4 of this invention is demonstrated.
- a light receiving element an infrared light-capable photodiode having spectral characteristics in the infrared light region and a visible light-to-infrared light corresponding photo diode having spectral characteristics in the visible light to infrared light region
- a diode is provided as an example
- the present embodiment is different from Embodiments 1 to 3 described above in that a light-receiving element capable of changing spectral characteristics is provided.
- Other configurations are as described in the first to third embodiments.
- members having the same functions as those shown in the drawings of Embodiments 1 to 3 are given the same reference numerals, and descriptions thereof are omitted.
- FIG. 11 is a diagram showing a schematic configuration of the light receiving element 21 capable of changing the spectral characteristics.
- the spectral characteristic changeable light receiving element 21 is a light receiving element having two or more PN junctions.
- the structure of the light-receiving element 21 capable of changing the spectral characteristics is configured by P substrate-N well-P diffusion in the stacking order, and the spectral characteristics can be changed by the switches 1 and 2.
- the spectral characteristic changeable light receiving element 21 includes a P substrate-N well photodiode 19 having spectral characteristics in the infrared light region and an N well-P diffusion photodiode 20 having spectral characteristics in the visible light region. I have.
- the switch 1 in the spectral characteristic changeable light receiving element 21 When the switch 1 in the spectral characteristic changeable light receiving element 21 is ON and the switch 2 is OFF, the P substrate-N well photodiode 19 is used, and the N well-P diffusion photodiode 20 is short-circuited. Therefore, the spectral characteristic changeable light-receiving element 21 has spectral characteristics in the infrared light region.
- the switch 1 in the spectral characteristic changeable light receiving element 21 is OFF and the switch 2 is ON, the P-substrate-N-well photodiode 19 is used and the N-well-P diffusion photodiode 20 is also used. Therefore, the spectral characteristic changeable light receiving element 21 has spectral characteristics in the visible light to infrared light region.
- FIG. 12 is a diagram showing a schematic configuration of a sensor device 23 including an infrared LED 1 as a light emitting element and a proximity illuminance sensor 22 having a pulse detecting function having two light receiving elements 21 that can change spectral characteristics. .
- the switch 1 is turned on and the switch 2 is turned off.
- the spectral characteristic with switch 1 turned off and switch 2 turned on A changeable light receiving element 21 is used.
- the spectral characteristic changeable light receiving element 21 having the same structure that is different only in the connection state of the switch can be used. Therefore, the light receiving element can be formed more efficiently than the light receiving elements having two different structures. Can do.
- Embodiment 5 Next, a fifth embodiment of the present invention will be described based on FIG.
- the light receiving portion (light receiving surface) of the light receiving element has been described as an example, but in the present embodiment, the light receiving portion of the light receiving element is described.
- the (light receiving surface) is divided into a plurality of parts.
- Other configurations are the same as those described in the first to fourth embodiments.
- members having the same functions as those shown in the drawings of Embodiments 1 to 4 are given the same reference numerals, and descriptions thereof are omitted.
- FIG. 13 is a diagram showing a schematic configuration of the light receiving element 24 in which the light receiving part (light receiving surface) is divided into a plurality of parts.
- the light receiving element 24 has a light receiving part (light receiving surface) divided into a plurality of parts.
- the light receiving part (light receiving surface) is divided into 16 matrixes, but the number of divisions and the divided shape are not particularly limited.
- all the light receiving parts that is, all the 16 light receiving surfaces PD00 to PD15 are used. This is because when operating as an illuminance sensor, it is preferable to use a large light-receiving area of the light-receiving element in order to increase sensitivity at low illuminance and improve directivity.
- the spot of reflected light emitted from the LED element 106 and reflected by the display panel 109 usually tends to shift to the opposite side of the LED element 106.
- the PD02, PD03, PD06, PD07, PD10, PD11, PD14, and PD15 are received in the light receiving area (designated aerial) among the 16 divided light receiving surfaces PD00 to PD15. It is preferable to select as. Thereby, the noise light quantity by the reflected light from the display panel in portable apparatuses etc. can be reduced.
- PD10, PD11, PD14, and PD15 are preferably selected as the light receiving area (designated aerial).
- Embodiment 6 of the present invention will be described with reference to FIG.
- a display panel such as a liquid crystal panel based on proximity determination data or illuminance data from a proximity illuminance sensor having a pulse detection function or a proximity sensor having a pulse detection function.
- the present embodiment is different from the first to fifth embodiments in that the brightness of the backlight is controlled.
- Other configurations are the same as those described in the first to fifth embodiments.
- members having the same functions as those shown in the drawings of Embodiments 1 to 5 are given the same reference numerals, and descriptions thereof are omitted.
- FIG. 14 is a diagram showing a schematic configuration of an electronic device 28 including a proximity illuminance sensor 8 having a pulse detection function, a backlight control unit 25, a backlight 26, and a liquid crystal panel 27.
- the luminance of the backlight is controlled via the backlight control unit 25 based on the proximity determination data and the illuminance data from the proximity illuminance sensor 8 having a pulse detection function.
- the illuminance data from the proximity illuminance sensor 8 having a pulse detection function varies depending on the situation where the electronic device 28 is placed, so that the luminance of the backlight is controlled by using the illuminance data, thereby the liquid crystal panel. 27 display quality can be maintained above a certain level.
- the electronic device 28 is a mobile phone, a smartphone, a digital camera, or the like
- control for reducing the luminance of the backlight may be performed.
- the electronic device is described as an example.
- the backlight corresponds to the light emitting element
- the backlight control unit corresponds to the light emitting element control unit.
- the light-emitting element may be included in a liquid crystal display panel or a backlight that emits light to the display panel.
- the light emitting element may be an organic EL light emitting element.
- a sensor is a sensor including a first light receiving element that receives infrared light, and an analog-digital conversion circuit that converts an analog output value of the first light receiving element into a digital output value, An adjustment circuit that adjusts the digital output value so as to change in accordance with each value of the distance in at least a predetermined range of the distance between the first light receiving element and the sensing object, and detects the cycle of the digital output value And a digital filter.
- a sensor capable of detecting a user's pulse using a proximity illuminance sensor or a proximity sensor can be realized.
- the sensor according to aspect 2 of the present invention preferably includes a second light receiving element that receives light in a region from visible light to infrared light.
- a sensor capable of detecting a user's pulse using a proximity illuminance sensor can be realized.
- each of the first light receiving element and the second light receiving element includes a light receiving element that receives infrared light and a light receiving element that receives visible light, and the first light receiving element.
- the element receives light using the light receiving element that receives the infrared light
- the second light receiving element receives light using the light receiving element that receives the infrared light and the light receiving element that receives the visible light. Preferably it is done.
- the first light receiving element and the second light receiving element can be formed with the same structure, the light receiving element can be formed more efficiently than when the light receiving elements having two different structures are formed.
- the digital filter is preferably composed of a low-pass filter and a high-pass filter.
- the digital filter has a pulse period as a passband.
- the sensor according to aspect 6 of the present invention it is preferable to detect the period of the digital output value using the maximum value or the minimum value of the output value from the digital filter.
- a period in which the output value from the digital filter is 0 is a period of the digital output value.
- the above configuration makes it easy to detect the user's pulse period.
- the first light receiving element preferably includes a plurality of divided light receiving parts, and preferably receives light using a light receiving part in a predetermined region among the plurality of light receiving parts. .
- the analog-to-digital conversion circuit integrates the current amount of the input current from the first light receiving element according to the amount of infrared light received for a predetermined time and outputs the integration.
- An analog-to-digital conversion circuit, and the integration-type analog-to-digital conversion circuit includes a charging circuit having a capacity for storing a charge amount according to the current amount, a discharge circuit for discharging a predetermined charge amount at a time, It is preferable to include a comparison circuit that compares the output voltage of the charging circuit and a reference voltage, and a control circuit that outputs the number of discharges of the discharge circuit based on the output value from the comparison circuit as a digital value. .
- the adjustment circuit may change the digital output value according to each value of the distance in at least a predetermined range of the distance between the first light receiving element and the sensing object. In addition, it is preferable to discharge a predetermined amount of charge during the measurement period.
- the sensor device includes the above-described sensor and a light emitting element that emits light including infrared light.
- a sensor device capable of detecting a user's pulse using a proximity illuminance sensor or a proximity sensor can be realized.
- the light emitting element it is preferable to control the light emitting element based on an output value from the sensor.
- the light emitting element may be included in a backlight that emits light to the liquid crystal display panel.
- the light emitting element may be an organic EL light emitting element.
- An electronic apparatus includes an electronic device including a sensor including a first light receiving element that receives infrared light and an analog-to-digital conversion circuit that converts an analog output value of the first light receiving element into a digital output value.
- An adjustment circuit that adjusts the sensor so that the digital output value changes according to each value of the distance in at least a predetermined range of the distance between the first light receiving element and the sensing object. The digital output value is digitally filtered and its period is detected.
- an electronic device capable of detecting a user's pulse using a proximity illuminance sensor or a proximity sensor can be realized.
- the present invention includes a sensor including a proximity sensor and a proximity illuminance sensor, a sensor device including the sensor and a light emitting element that emits light including infrared light, and an electronic device including the proximity sensor and the proximity illuminance sensor. It can be used suitably.
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Abstract
Description
図16は、携帯電話やスマートフォンなどの携帯機器に搭載されている従来の近接センサの一例を示す。
本発明の一実施形態について図1~図8に基づいて説明すれば、以下のとおりである。
(発光素子)
本実施の形態においては、脈拍検出機能を備えた近接照度センサ8の受光波長領域を考慮し、発光素子として赤外光LED1を用いている。ユーザの指の血液中のヘモグロビンには、近赤外光を良く吸収する性質があり、赤外光領域を含む光を出射する発光素子を用いることが好ましい。
(脈拍検出機能を備えた近接照度センサ)
図1に図示されているように、脈拍検出機能を備えた近接照度センサ8は、受光素子として、赤外光領域に分光特性を有する赤外光対応フォトダイオード2と可視光~赤外光領域に分光特性を有する可視光~赤外光対応フォトダイオード3とを備えている。
(積分型アナログデジタル変換回路およびカウント調整回路)
図2は、積分型アナログデジタル変換回路とカウント調整回路との概略構成を示す図である。
(受光素子)
図5は、近接照度センサ8に備えられた赤外光領域に分光特性を有する赤外光対応フォトダイオード2と可視光~赤外光領域に分光特性を有する可視光~赤外光対応フォトダイオード3との分光特性の一例を示す図である。
(デジタルフィルター)
図6は、近接照度センサ8に備えられたデジタルフィルター4を説明するための図である。
次に、図9に基づいて、本発明の実施の形態2について説明する。上述した実施の形態1においては、脈拍検出機能を備えた近接照度センサを備えたセンサ装置を例に挙げて説明したが、本実施の形態においては、脈拍検出機能を備えた近接センサを備えたセンサ装置を例に挙げて説明するという点において、上記の実施の形態1とは異なる。その他の構成については実施の形態1において説明したとおりである。説明の便宜上、上記の実施の形態1の図面に示した部材と同じ機能を有する部材については、同じ符号を付し、その説明を省略する。
次に、図10に基づいて、本発明の実施の形態3について説明する。上述した実施の形態1および2においては、アナログデジタル変換回路4からのデジタル出力値(ADCOUT1)をデジタルフィルター処理するデジタルフィルター6が脈拍検出機能を備えた近接照度センサや脈拍検出機能を備えた近接センサに備えられている場合を例に挙げて説明したが、本実施の形態においては、アナログデジタル変換回路4からのデジタル出力値(ADCOUT1)のデジタルフィルター処理が近接照度センサや近接センサ外でソフトウェア的に処理されるという点において、上記の実施の形態1および2とは異なる。その他の構成については実施の形態1および2において説明したとおりである。説明の便宜上、上記の実施の形態1および2の図面に示した部材と同じ機能を有する部材については、同じ符号を付し、その説明を省略する。
次に、図11および図12に基づいて、本発明の実施の形態4について説明する。上述した実施の形態1~3は、受光素子として、赤外光領域に分光特性を有する赤外光対応フォトダイオードや可視光~赤外光領域に分光特性を有する可視光~赤外光対応フォトダイオードを備えている場合を例に挙げて説明したが、本実施の形態においては、分光特性変更可能受光素子を備えているという点において、上記の実施の形態1~3とは異なる。その他の構成については実施の形態1~3において説明したとおりである。説明の便宜上、上記の実施の形態1~3の図面に示した部材と同じ機能を有する部材については、同じ符号を付し、その説明を省略する。
次に、図13に基づいて、本発明の実施の形態5について説明する。上述した実施の形態1~4は、受光素子の受光部(受光面)が面一状に形成されている場合を例に挙げて説明したが、本実施の形態においては、受光素子の受光部(受光面)が複数に分割されている点において、上記の実施の形態1~4とは異なる。その他の構成については実施の形態1~4において説明したとおりである。説明の便宜上、上記の実施の形態1~4の図面に示した部材と同じ機能を有する部材については、同じ符号を付し、その説明を省略する。
次に、図14に基づいて、本発明の実施の形態6について説明する。本実施の形態においては、脈拍検出機能を備えた近接照度センサや脈拍検出機能を備えた近接センサからの近接判断データまたは照度データに基づいて、例えば、液晶パネルなどの表示パネルに光を照射するバックライトの輝度を制御するという点において、上記の実施の形態1~5とは異なる。その他の構成については実施の形態1~5において説明したとおりである。説明の便宜上、上記の実施の形態1~5の図面に示した部材と同じ機能を有する部材については、同じ符号を付し、その説明を省略する。
本発明の態様1におけるセンサは、赤外光を受光する第1受光素子と、上記第1受光素子のアナログ出力値をデジタル出力値に変換するアナログデジタル変換回路とを備えたセンサであって、上記デジタル出力値が上記第1受光素子と検知物体との間の距離の少なくとも所定範囲において上記距離の各々の値に応じて変化するように調整する調整回路と、上記デジタル出力値の周期を検出するためのデジタルフィルターと、を備えたことを特徴としている。
2 赤外光対応フォトダイオード(第1受光素子)
3 可視光~赤外光対応フォトダイオード(第2受光素子)
4 アナログデジタル変換回路
5 カウント調整回路(調整回路)
6 デジタルフィルター
7 アナログデジタル変換回路
8 近接照度センサ(センサ)
9 センサ装置
10 充電回路
11 放電回路
12 比較回路
13 制御回路
14 近接センサ(センサ)
15 センサ装置
16 近接センサ
17 センサ装置
18 電子機器
19 P基板-Nウェルフォトダイオード
20 Nウェル-P拡散フォトダイオード
21 分光特性変更可能受光素子
22 近接照度センサ(センサ)
23 センサ装置
24 受光面が分割された受光素子
25 バックライト制御部
26 バックライト
27 液晶パネル(表示パネル)
28 電子機器
Claims (5)
- 赤外光を受光する第1受光素子と、上記第1受光素子のアナログ出力値をデジタル出力値に変換するアナログデジタル変換回路とを備えたセンサであって、
上記デジタル出力値が上記第1受光素子と検知物体との間の距離の少なくとも所定範囲において上記距離の各々の値に応じて変化するように調整する調整回路と、
上記デジタル出力値の周期を検出するためのデジタルフィルターと、を備えたことを特徴とするセンサ。 - 上記デジタルフィルターは、ローパスフィルターとハイパスフィルターとで構成されていることを特徴とする請求項1に記載のセンサ。
- 上記デジタルフィルターからの出力値の最大値または最小値を用いて、上記デジタル出力値の周期を検出することを特徴とする請求項1または2に記載のセンサ。
- 請求項1から3の何れか1項に記載のセンサと、赤外光を含む光を出射する発光素子とを備えたことを特徴とするセンサ装置。
- 赤外光を受光する第1受光素子と、上記第1受光素子のアナログ出力値をデジタル出力値に変換するアナログデジタル変換回路とを備えたセンサを含む電子機器であって、
上記センサには、上記デジタル出力値が上記第1受光素子と検知物体との間の距離の少なくとも所定範囲において上記距離の各々の値に応じて変化するように調整する調整回路が備えられており、
上記デジタル出力値はデジタルフィルター処理され、その周期が検出されることを特徴とする電子機器。
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