JP6956317B2 - Infrared sensor module - Google Patents

Description

The present invention relates to an infrared sensor module that detects the temperature of a person or the like in a non-contact manner.

As a diagnostic function of the conventional infrared sensor module, a temperature detection function diagnostic device provided in the temperature sensor is known. The conventional temperature detection function diagnostic device diagnoses the temperature detection function of the temperature sensor, determines the abnormality of the infrared sensor by a majority decision, etc., and when the abnormality of the infrared sensor is determined, the temperature detection circuit or the infrared sensor detects overtemperature. I was switching functions. (Patent Document 1)

Japanese Unexamined Patent Publication No. 2016-206040

However, the conventional infrared sensor module has a problem that the operation of the entire infrared sensor system must be stopped when an abnormality occurs in only a part of the infrared sensor.

The present invention solves the above-mentioned problems, and by changing the operation of the infrared sensor module according to the state of the memory that records the adjustment value of the infrared sensor, the infrared ray that can respond to the abnormality of the memory according to the state of the memory. It is an object of the present invention to provide a sensor module.

In order to solve the above problems, the present invention uses an infrared sensor that detects infrared rays to be measured, a first processing circuit that processes the output signal of the infrared sensor, and an output signal of the first processing circuit. A determination to determine the state of the memory by comparing the second processing circuit for signal processing, at least three or more memories for recording the output value of the second processing circuit, and the value recorded in the memory with each other. It has a unit and a change unit that changes a value recorded in the memory, and at least one of the memory is provided in each of the first processing circuit and the second processing circuit, and the determination unit records. When it is determined that there is at least one memory in which an abnormal value is recorded whose value does not match any other value in the memory, the change unit determines the value of the memory in which the abnormal value is recorded. The configuration was such that the normal value was changed to the value of the recorded memory.

In another aspect, an infrared sensor that detects infrared rays to be measured, a first processing circuit that processes the output signal of the infrared sensor, and a first processing circuit that processes the output signal of the first processing circuit. It has two processing circuits, at least three or more memories for recording the output values of the second processing circuit, and a determination unit for determining the state of the memories by comparing the values recorded in the memories with each other. , The memory is provided at least one in each of the first processing circuit and the second processing circuit, and the determination unit has an abnormal value in which the recorded value does not match the value of any other memory. When it is determined that at least one of the recorded memories exists, the first processing circuit and the second processing circuit are configured so as not to refer to the value of the memory in which an abnormal value is recorded.

In another aspect, an infrared sensor that detects infrared rays to be measured, a first processing circuit that processes the output signal of the infrared sensor, and a first processing circuit that processes the output signal of the first processing circuit. The processing circuit of 2, at least three or more memories for recording the output value of the second processing circuit, a determination unit for determining the state of the memory by comparing the values recorded in the memory with each other, and the above. It has an output terminal for outputting the determination result of the determination unit, and at least one of the memories is provided in each of the first processing circuit and the second processing circuit. When it is determined that there is at least one memory in which an abnormal value that does not match the value of the memory of the throat is recorded, the determination unit is configured to output a signal from the output terminal.

The infrared sensor module of the present invention changes the value of the memory when an abnormality occurs in the memory provided in the infrared sensor and the detection circuit, if all the memories provided in the infrared sensor do not have an abnormality. This makes it possible to restore the memory value to a normal value.

Another aspect of the infrared sensor module is an infrared sensor module that refers to an abnormal memory value by not referring to the memory in which the abnormality has occurred when an abnormality occurs in the memory provided in the infrared sensor and the detection circuit. Output abnormality can be prevented.

In another aspect of the infrared sensor module, when an abnormality occurs in the infrared sensor and the memory provided in the detection circuit, the occurrence of the abnormality can be output to the outside.

The figure which shows the structure of the infrared sensor module of Embodiment 1. The figure which shows the structure of the infrared sensor module of Embodiment 2. The figure which shows the structure of the infrared sensor module of Embodiment 3. The figure which shows the structure of the infrared sensor module of Embodiment 4.

Hereinafter, the infrared sensor module according to the embodiment will be described with reference to the drawings. In each drawing, the same reference numerals are given to the same configurations, and the description thereof will be omitted. Moreover, each component in each embodiment may be arbitrarily combined as long as there is no contradiction.

(Embodiment 1)
Hereinafter, the infrared sensor module according to the first embodiment will be described with reference to the drawings.

FIG. 1 is a diagram showing the configuration of the infrared sensor module of the first embodiment, and FIG. 2 is a side sectional view of the infrared sensor.

The infrared sensor module 1 signals the infrared sensor 2 that detects the infrared ray to be measured, the first processing circuit 3 that processes the output signal of the infrared sensor 2, and the output signal of the first processing circuit 3. A determination to determine the state of the memory 5 by comparing the second processing circuit 4, the plurality of memories 5 for recording the output values of the second processing circuit 4, and the values recorded in the memory 5 with the other memories 5. It has a unit 6 and a change unit 7 for changing the value recorded in the memory 5. The infrared sensor module 1 detects the infrared rays of the object to be measured by the infrared sensor 2 and processes them by the first processing circuit 3 and the second processing circuit 4, thereby detecting the temperature of the object to be measured and feeling warm and cold. Can be guessed. The external device can be controlled by detecting the temperature of the object to be measured such as a person or food and inputting the output signal of the infrared sensor module 1 to the external device such as an air conditioner, a microwave oven, or a multifunction device.

The infrared sensor 2 has a thermal infrared detector in which a temperature sensitive portion is embedded, and the temperature sensitive portion is composed of a thermopile that converts thermal energy from infrared rays emitted from a detected object into electrical energy. A thermoelectric conversion unit is used. Further, in the infrared sensor 2, a × b pixel portions (non-contact infrared detection elements) having a temperature sensitive portion and a MOS transistor for extracting the output voltage of the temperature sensitive portion are a on one surface side of the semiconductor substrate. It is arranged in a two-dimensional array in rows and columns b, and the infrared sensor 2 has a pixel portion of 8 × 8. The pixel portion is not limited to 8 × 8, and may be configured as, for example, 16 × 4. Further, although the resolution of the thermal image that can be acquired by the infrared sensor 2 can be improved by arranging the pixel portions in an array, the configuration may be such that only one pixel portion is arranged.

An ASIC (Application Specific Integrated Circuit) is used in the first processing circuit 3, but the first processing circuit 3 is not limited to this. The first processing circuit 3 converts the output of the infrared sensor 2 into voltage information. A microcomputer is used in the second processing circuit 4, but it is not limited to this. The second processing circuit 4 converts the output signal of the first processing circuit 3 into temperature information. The output signal of the second processing circuit 4 is output to the outside from the sensor signal output terminal 8. At least one memory 5 is provided in each of the first processing circuit 3 and the second processing circuit 4. The memory 5 contains a ROM (Read Only).
Memory) is used, but it is not limited to this. Information for controlling the infrared sensor 2 is recorded in the memory 5 provided in the first processing circuit 3. The memory 5 provided in the second processing circuit 4 records information for controlling the second processing circuit 4 and information for controlling the external member when the infrared sensor module 1 is connected to the external member. Has been done. The output signal of the second processing circuit 4 is recorded as an output value of the second processing circuit 4 in the memory 5 provided in the first processing circuit 3 and the second processing circuit 4. Although the first processing circuit 3 converts the output signal of the infrared sensor 2 into voltage information and the second processing circuit 4 converts it into temperature information, the operation is not limited to this. For example, when the infrared sensor module 1 outputs the estimation information of the feeling of temperature and coldness of the object to be measured, the first processing circuit 3 converts it into temperature information, and the second processing circuit 4 converts the temperature and cooling of the object to be measured. You may estimate the feeling. Further, for example, when scanning the infrared sensor 2 using an external member such as a motor, the first processing circuit 3 may convert the infrared sensor 2 into temperature information, and the second processing circuit 4 may control the external member. .. As described above, the operations of the first processing circuit 3 and the second processing circuit 4 can be appropriately changed according to the application of the infrared sensor module 1 and the like.

The determination unit 6 is provided separately from the first processing circuit 3 and the second processing circuit 4. However, the determination unit 6 may be provided integrally with the first processing circuit 3 or the second processing circuit 4. The determination unit 6 compares the values of the memories 5 provided in the first processing circuit 3 and the second processing circuit 4, and determines the state of the memory 5. The same value is recorded in the memory 5 that is operating normally. Therefore, when there are a plurality of memories 5 that are operating normally, there are a plurality of other memories 5 having matching values. The matching referred to here is not limited to the case where the values are completely matching, and an error that does not cause a problem when using the infrared sensor module 1 is allowed. In the memory 5 having the same symbol, the recorded values match. Since the same value is recorded in all of the first to third memories, when there are a plurality of normal memories 5, the values of the plurality of memories 5 match, and the value of the memory 5 in which the abnormality occurs is the value of the memory 5. It does not match the normal memory 5. Therefore, when there are a plurality of memories 5 having matching values, the determination unit 6 determines that the plurality of memories 5 are normal and that the memory 5 in which different values are recorded has an abnormality.

Since information for controlling the infrared sensor 2 is recorded in the memory 5 provided in the first processing circuit 3, when an abnormality occurs in all of the memories 5 provided in the first processing circuit 3. It becomes impossible to accurately detect the temperature of the object to be measured. If an external device such as an air conditioner is controlled in this state, the external device may perform an unexpected operation by the user. Therefore, all of the memories 5 provided in the first processing circuit 3 have an abnormality. When it occurs, the determination unit 6 stops the operation of the infrared sensor module 1 in order to improve the safety of the external device.

The change unit 7 is a circuit provided separately from the infrared sensor 2 and the processing circuit. The changing unit 7 may be provided integrally with the first processing circuit 3, the second processing circuit 4, and the determination unit 6. The changing unit 7 can change the value of the memory 5.

The abnormality detection of the memory 5 will be described. Here, an example will be described in which three memories 5 are provided in accordance with the first processing circuit 3 and the second processing circuit 4.

First, a case where one memory 5 is provided in the first processing circuit 3 and two memories 5 are provided in the second processing circuit 4 will be described. The memory 5 provided in the first processing circuit 3 will be described as a first memory, and the memory 5 provided in the second processing circuit 4 will be described as a second memory and a third memory. Table 1 describes the operation of the infrared sensor module 1 in each pattern in which the values of the first to third memories change. In Table 1, the values of the first to third memories are indicated by the symbols “◯”, “×”, and “Δ”.

In the pattern 1-1, since the values of the first to third memories are all “◯”, all the first to third memories match. Therefore, the determination unit 6 determines that all the first to third memories are normal. In this case, the infrared sensor module 1 maintains the same operation.

In pattern 1-2, the value of the first memory is “x”, the value of the second memory and the value of the third memory are “◯”. In this case, it is determined that an abnormality has occurred in the first memory and the second memory and the third memory are normal. At this time, since an abnormality has occurred in the first memory provided only once in the first processing circuit 3, the operation of the infrared sensor 2 is stopped by the first processing circuit 3.

In patterns 1-3, the value of the second memory is “x”, the value of the first memory and the value of the third memory are “◯”. In this case, it is determined that an abnormality has occurred in the second memory and the first memory and the third memory are normal. At this time, since the first memory is normal, the change unit 7 changes the value of the second memory to the same “◯” as the first memory and the third memory.

In patterns 1-4, the value of the third memory is “x”, the value of the first memory and the value of the second memory are “◯”. In this case, it is determined that an abnormality has occurred in the third memory and the first memory and the second memory are normal. At this time, since the first memory is normal, the changing unit 7 changes the value of the third memory to the same “◯” as the first memory and the second memory.

In patterns 1-5, the value of the first memory is “◯”, the value of the second memory is “x”, and the value of the third memory is “Δ”. Since all the values of the first to third memories are different, it can be seen that at least two of the first to third memories have an abnormality. However, since the normal memory 5 cannot be determined, the determination unit 6 determines that the normal memory 5 cannot be determined. At this time, since the value of the memory 5 in which the abnormality has occurred cannot be changed, the operation of the infrared sensor 2 is stopped by the first processing circuit 3.

Next, a case where two memories 5 are provided in the first processing circuit 3 and one memory 5 is provided in the second processing circuit 4 will be described. The memory 5 provided in the first processing circuit 3 will be referred to as a first memory and a second memory, and the memory 5 provided in the second processing circuit 4 will be referred to as a third memory. Table 2 describes the operation of the infrared sensor module 1 in each pattern in which the values of the first to third memories change.

In the pattern 2-1 because the values of the first to third memories are all “◯”, all the first to third memories match. Therefore, the determination unit 6 determines that all the first to third memories are normal. In this case, the infrared sensor module 1 maintains the same operation.

In pattern 2-2, the value of the first memory is “x”, the value of the second memory and the value of the third memory are “◯”. In this case, it is determined that an abnormality has occurred in the first memory and the second memory and the third memory are normal. At this time, since the second memory of the memory 5 provided in the first processing circuit 3 is normal, the value of the first memory is changed to the value of the second memory and the value of the third memory by the changing unit 7. change.

In patterns 2-3, the value of the second memory is “x”, the value of the first memory and the value of the third memory are “◯”. In this case, it is determined that an abnormality has occurred in the second memory and the first memory and the third memory are normal. At this time, since the first memory of the memory 5 provided in the first processing circuit 3 is normal, the value of the second memory is changed to the value of the first memory and the value of the third memory by the changing unit 7. change.

In patterns 2-4, the value of the third memory is “x”, the value of the first memory and the value of the second memory are “◯”. In this case, it is determined that an abnormality has occurred in the third memory and the first memory and the second memory are normal. At this time, since the first and second memories of the memory 5 provided in the first processing circuit 3 are normal, the value of the first memory is changed to the second memory and the third memory by the changing unit 7. Change to the value of.

In pattern 2-5, the value of the first memory is “◯”, the value of the second memory is “x”, and the value of the third memory is “Δ”. Since all the values of the first to third memories are different, at least two of the first to third memories have an abnormality. At this time, the operation of the infrared sensor 2 is stopped by the first processing circuit 3.

In this way, when all the memories 5 provided in the first processing circuit 3 have abnormal values and when all three memories 5 have different values, the operation of the infrared sensor module 1 is stopped and the first processing is performed. When at least one of the memories 5 provided in the circuit 3 is normal and there is another abnormal memory 5, the value of the memory 5 in which the abnormal value is recorded is changed. As a result, it is possible to increase the situation in which the infrared sensor module 1 can be used normally because it can be dealt with only by changing the value of the memory 5 in which an abnormality has occurred depending on the situation.

In the first embodiment, the case where a total of three memories 5 are provided has been described, but the situation where the infrared sensor module 1 is normally used can be determined by taking the same measures even when the number of memories 5 is four or more. Can be increased. Even in this case, if all the memories 5 provided in the first processing circuit 3 have abnormal values and if all three memories 5 have different values, the operation of the infrared sensor module 1 is stopped and the first processing is performed. When at least one of the memories 5 provided in the circuit 3 is normal and there is another abnormal memory 5, the value of the memory 5 in which the abnormal value is recorded may be changed. As a result, the same effect as in the case where the memory 5 described above is three can be obtained.

(Embodiment 2)
The infrared sensor module of the second embodiment will be described below.

FIG. 2 is a diagram showing the configuration of the infrared sensor module of the second embodiment.

The infrared sensor module 11 signals the infrared sensor 2 that detects the infrared ray to be measured, the first processing circuit 3 that processes the output signal of the infrared sensor 2, and the output signal of the first processing circuit 3. A determination to determine the state of the memory 5 by comparing the second processing circuit 4, the plurality of memories 5 for recording the output values of the second processing circuit 4, and the values recorded in the memory 5 with the other memories 5. It has a part 6.

In the infrared sensor module 11 of the second embodiment, the value of the memory 5 in which the abnormality has occurred is not referred to. When all the memories 5 provided in the first processing circuit 3 have abnormal values and when all three memories 5 have different values, the operation of the infrared sensor module 11 is stopped and the first processing circuit 3 is provided. When at least one of the stored memories 5 is normal and there is another abnormal memory 5, the value of the memory 5 in which the abnormal value is recorded is not referred to after the abnormality is detected.

As described above, in the infrared sensor module 11 of the second embodiment, the infrared sensor module 11 is controlled by referring only to the normal memory 5 without referring to the value of the memory 5 in which the abnormality has occurred after the abnormality has occurred. As a result, it is possible to increase the situation in which the infrared sensor module 11 can be used normally without stopping the operation of the infrared sensor 2.

(Embodiment 3)
The infrared sensor module of the third embodiment will be described below.

FIG. 3 is a diagram showing the configuration of the infrared sensor module of the third embodiment.

The infrared sensor module 21 signals the infrared sensor 2 that detects the infrared ray to be measured, the first processing circuit 3 that processes the output signal of the infrared sensor 2, and the output signal of the first processing circuit 3. A determination to determine the state of the memory 5 by comparing the second processing circuit 4, the plurality of memories 5 for recording the output values of the second processing circuit 4, and the values recorded in the memory 5 with the other memories 5. The unit 6 has an output terminal 22 for outputting the determination result of the determination unit 6. Further, the output terminal 22 is connected to a power supply control unit 23 that controls a power source that supplies electric power to the infrared sensor module 21.

In the infrared sensor module 21 of the third embodiment, when an abnormality in the memory 5 is detected, the power of the infrared sensor module 21 is turned off and then turned on again. When all the memories 5 provided in the first processing circuit 3 have abnormal values and when all three memories 5 have different values, the operation of the infrared sensor module 21 is stopped and the first processing circuit 3 is provided. If at least one of the stored memories 5 is normal and there is another abnormal memory 5, the power supply is reset.

As described above, in the infrared sensor module 21 of the third embodiment, the value of the memory 5 in which the abnormality has occurred is reset by resetting the power supply, and when the abnormality in the memory 5 is mild, it can be used as it is. It can be so. As a result, it is possible to increase the situation in which the infrared sensor module 21 can be used normally without stopping the operation of the infrared sensor 2.

(Embodiment 4)
The infrared sensor module of the fourth embodiment will be described below.

FIG. 4 is a diagram showing the configuration of the infrared sensor module of the third embodiment.

The infrared sensor module 31 signals the infrared sensor 2 that detects the infrared ray to be measured, the first processing circuit 3 that processes the output signal of the infrared sensor 2, and the output signal of the first processing circuit 3. A determination to determine the state of the memory 5 by comparing the second processing circuit 4, the plurality of memories 5 for recording the output values of the second processing circuit 4, and the values recorded in the memory 5 with the other memories 5. The unit 6 has an output terminal 22 for outputting the determination result of the determination unit 6. The output terminal 22 is connected to the notification unit 32.

The notification unit 32 uses a member that can notify by voice such as a speaker. When an abnormality occurs in the memory 5, the user can be notified of the occurrence of the abnormality. The infrared sensor module 31 may be connected to an external device having a display via an output terminal, the external device may be used as a notification unit, and the display of the external device may be notified of an abnormality in the memory 5.

In the infrared sensor module 31 of the second embodiment, when an abnormality in the memory 5 is detected, the infrared sensor module 31 notifies that the abnormality has occurred in the memory 5. Here, the notification method may be divided according to importance. In this case, when all the memories 5 provided in the first processing circuit 3 have abnormal values and when all three memories 5 have different values, it is notified that a serious abnormality has occurred in the memory 5 and the second is notified. When at least one of the memories 5 provided in the processing circuit 3 of 1 is normal and there is another abnormal memory 5, the abnormality of the memory 5 is notified by a normal notification method. In this way, by changing the notification method according to the importance of the abnormality, the user can know the situation in detail, so that the abnormality of the memory 5 can be flexibly dealt with.

As described above, in the infrared sensor module 31 of the fourth embodiment, the user can be notified of the abnormality by notifying when the abnormality occurs. Further, as in the first to third embodiments, the value of the memory 5 in which the abnormality has occurred may be changed, the memory 5 in which the abnormality has occurred may not be referred to, or the power supply may be reset. In this way, by combining the correspondence of the first to third embodiments and the notification, the user can know that an abnormality has occurred in the memory 5 while using the infrared sensor module 31.

The present disclosure is useful for temperature detection in air-conditioning equipment and the like because it is possible to respond according to the state of the memory when an abnormality occurs in the memories provided in the first processing circuit and the second processing circuit.

1, 11, 21, 31 Infrared sensor module 2 Infrared sensor 3 First processing circuit 4 Second processing circuit 5 Memory 6 Judgment unit 7 Change unit 8 Sensor signal output terminal 22 Output terminal 23 Power supply control unit 32 Notification unit

Claims (7)

An infrared sensor that detects infrared rays to be measured and
A first processing circuit that processes the output signal of the infrared sensor, and
A second processing circuit that processes the output signal of the first processing circuit, and
At least three or more memories for recording the output value of the second processing circuit, and
A determination unit that determines the state of the memory by comparing the values recorded in the memory with each other.
It has a change part that changes the value recorded in the memory.
At least one memory is provided in each of the first processing circuit and the second processing circuit.
When the determination unit determines that there is at least one memory in which an abnormal value in which the recorded value does not match the value of any other memory is recorded, the change unit records the abnormal value. An infrared sensor module that changes the value of the memory to the value of the memory in which a normal value is recorded. An infrared sensor that detects infrared rays to be measured and
A first processing circuit that processes the output signal of the infrared sensor, and
A second processing circuit that processes the output signal of the first processing circuit, and
At least three or more memories for recording the output value of the second processing circuit, and
It has a determination unit that determines the state of the memory by comparing the values recorded in the memory with each other.
At least one memory is provided in each of the first processing circuit and the second processing circuit.
When the determination unit determines that there is at least one memory in which an abnormal value in which the recorded value does not match the value of any other memory is recorded, the first processing circuit and the second processing circuit are used. The processing circuit of is an infrared sensor module that does not refer to the value of the memory in which an abnormal value is recorded. An infrared sensor that detects infrared rays to be measured and
A first processing circuit that processes the output signal of the infrared sensor, and
A second processing circuit that processes the output signal of the first processing circuit, and
At least three or more memories for recording the output value of the second processing circuit, and
A determination unit that determines the state of the memory by comparing the values recorded in the memory with each other.
It has an output terminal that outputs the judgment result of the judgment unit.
At least one memory is provided in each of the first processing circuit and the second processing circuit.
When the determination unit determines that there is at least one memory in which an abnormal value in which the recorded value does not match the value of any other memory is recorded, the determination unit outputs a signal from the output terminal. Infrared sensor module to output. Further having a notification unit connected to the output terminal and notifying the state of the memory,
The infrared sensor module according to claim 3, wherein the notification unit notifies an abnormality of the memory when an abnormal value is recorded in the memory. It further has a power supply control unit connected to the output terminal that controls the power supply that supplies power to the infrared sensor module.
The infrared sensor module according to claim 3 or 4, wherein the power supply control unit resets the power supply when an abnormal value is recorded in the memory. The infrared sensor module according to any one of claims 1 to 5, wherein when the determination unit determines that an abnormal value is recorded in a majority of the memory, the operation of the infrared sensor is stopped. The infrared sensor module according to any one of claims 1 to 5, wherein when the determination unit determines that all the values of the memories provided in the infrared sensor are abnormal values, the operation of the infrared sensor is stopped. ..

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