JP2022029506A - Human body part detection device and three-dimensional input device - Google Patents

Abstract

To provide a human body part detection device and a three-dimensional input device capable of reliably detecting that a human body part has been inserted into a detection space and a projection space area with a pyroelectric infrared sensor regardless of the rise or fall of the environmental temperature.SOLUTION: A human body part detection device for detecting that a human body part has been inserted into a detection space, includes: a pyroelectric infrared sensor that receives infrared light radiated from the detection space side and can measure the temperature of the detection space; temperature adjusting means that can adjust the temperature in the detection space; and a control unit that controls the temperature adjusting means based on the result of detection by the pyroelectric infrared sensor, so that the temperature of the detection space maintains a constant set temperature range that does not overlap with the normal temperature range for human. The control unit recognizes that the human body part is inserted into the detection space based on the change in the temperature of the detection space detected by the pyroelectric infrared sensor.SELECTED DRAWING: Figure 1

Description

The present invention relates to a human body part detecting device capable of detecting that a human body part such as a human finger or a hand is inserted into the detection space. Further, the present invention causes an image or video of an input terminal to be displayed in a projection space area set in the detection space, and detects the insertion of a human body portion in the image or video of the input terminal displayed in the projection space area. The present invention relates to a three-dimensional input device capable of inputting information corresponding to an image or video of an input terminal.

Various devices for detecting the insertion of a human body part such as a human finger into a predetermined detection space have been proposed. As a device using a pyroelectric infrared sensor, for example, the shutter control described in Patent Document 1 is described. Equipment is mentioned. In this device, a sensor that detects far infrared rays emitted from the human body is placed near the opening of the operation room where the transaction object is entered and exited, and the shutter closing operation is stopped according to the detection value from the sensor. Is being controlled.

Further, there are various types of three-dimensional input devices in the past, and for example, as shown in Patent Document 2 below, there is a type in which a floating image corresponding to an input terminal is displayed in space.

As a non-contact input device, the spread of such a three-dimensional input device is urgently needed due to virus infection prevention measures, and the applicant has just started to develop a reliable and high-performance three-dimensional input device.

Japanese Unexamined Patent Publication No. 63-76096 Japanese Patent No. 5036875

Under such circumstances, the applicant causes the image or video of the input terminal to be displayed in the projection space region in the three-dimensional input device, and inserts the human body part into the image or video of the input terminal displayed in the projection space region. A pyroelectric infrared sensor was adopted as a means for detection, and a device was developed in which the projection space area was set in the detection space of this sensor. When a human body part is inserted into the projection space region, the thermoelectric infrared sensor detects the body temperature of the human body part (for example, 35 ° C to 37 ° C) with the sensor, and the human body is inserted into the projection space region. We have just developed a device that displays the image or video of the input terminal and enables input of information corresponding to the image or video of the input terminal. That is, by adopting such a thermoelectric infrared sensor, it is possible to recognize that the human body part is truly inserted into the projection space region, and for example, an insect (fly, mosquito) or the like invades and mistakenly recognizes the projection space region. It is possible to display the image or video of the input terminal on the screen and prevent a malfunction in which the information corresponding to the image or video of the input terminal is erroneously input.

However, when the focal infrared sensor detects the insertion of a human body part consisting of a human finger or hand into the projection space region, when the temperature in the summer projection space region reaches 35 ° C or higher near the body temperature, the projection space region Even if a human body part is inserted into the human body part, it may be difficult to accurately detect the temperature change due to infrared rays emitted from the human body part. We have just developed a detection device and a three-dimensional input device.

The present invention has been made in view of the above points, and it is found that the human body part is inserted into the detection space and the projection space region by the pyroelectric infrared sensor without being affected by the rise or fall of the environmental temperature. It is an object of the present invention to provide a human body part detection device and a three-dimensional input device capable of reliable detection.

In order to solve the above problems, the human body part detection device of the present invention is a human body part detection device that detects that a human body part has been inserted into the detection space, and receives infrared light radiated from the detection space side. The temperature of the detection space is based on the results of the detection by the thermoelectric infrared sensor that can measure the temperature of the detection space, the temperature adjustment means that can adjust the temperature in the detection space, and the thermoelectric infrared sensor. The control unit is provided with a control unit that controls the temperature adjusting means so as to maintain a constant set temperature range that does not overlap the normal temperature range of the person, and the control unit is the temperature of the detection space detected by the charcoal-type infrared sensor. It is characterized by recognizing that a human body part has been inserted into the detection space based on the change.

In the human body part detecting device of the present invention, it is preferable that the temperature adjusting means is arranged so as to face the pyroelectric infrared sensor with the detection space interposed therebetween.

In the human body part detection device of the present invention, the normal temperature range is in the range of 35 ° C to 37 ° C, and when the first temperature range exceeding 37 ° C is set as the set temperature range, the heater is used as the temperature adjusting means. When the second temperature region is arranged and the set temperature region is set to less than 35 ° C, it is preferable that the cooling body is arranged as the temperature adjusting means.

The three-dimensional input device of the present invention causes an image or video of an input terminal to be displayed in a projection space region, and the image or video of the input terminal displayed in the projection space region is a human body part composed of a human finger or a hand. It is a three-dimensional input device that can detect insertion and input information corresponding to the image or video of the input terminal, and can receive infrared light emitted from the projection space region side and measure the temperature in the projection space region. Based on the results of detection by the charcoal-type infrared sensor, the temperature control means that can adjust the temperature in the projection space region, and the charcoal-type infrared sensor, the temperature in the projection space region is within the normal temperature range of humans. A control unit that controls the temperature adjusting means so as to maintain a constant set temperature range that does not overlap is provided, and the control unit is a detection space based on a change in the temperature of the detection space detected by the pyroelectric infrared sensor. When the insertion of the human body part is recognized, the three-dimensional input device causes the image or video of the input terminal to be displayed in the projection space area and is displayed in the projection space area. It is characterized by further comprising a detection input means capable of inputting a target signal by detecting the contact of a human body part with the image or video of the input terminal.

In the three-dimensional input device of the present invention, the normal temperature range is in the range of 35 ° C to 37 ° C, and the set temperature range is the first temperature range exceeding 37 ° C or the second temperature below 35 ° C. It is preferably a region.

In the three-dimensional input device of the present invention, the set temperature region is the first temperature region exceeding 37 ° C. In the detection input means, the temperature of the projection space region detected by the pyroelectric infrared sensor is the first temperature region. When the temperature is lower than that, it is possible to drive a heater as a temperature adjusting means arranged directly under the projection space region to set the temperature of the projection space region to the temperature of the first temperature region or higher. preferable.
The heater is preferably either a heating plate or a thermistor.

In the three-dimensional input device of the present invention, the set temperature region is the second temperature region of less than 35 ° C, and in the detection input means, the temperature of the projection space region detected by the pyroelectric infrared sensor is the second temperature region. When the temperature is higher than that, the cooling body as a temperature adjusting means arranged directly under the projection space region is driven to set the temperature of the projection space region to the temperature of the second temperature region or lower. Is preferable.
The cooling body is preferably a Pelche element.

According to the present invention, it is possible to reliably detect that a human body part has been inserted into the detection space or the projection space area with a pyroelectric infrared sensor regardless of the rise or fall of the environmental temperature of the installation location. It is possible to provide a human body part detection device and a three-dimensional input device.

It is a perspective view which shows the whole structure of the human body part detection apparatus place which concerns on 1st Embodiment. It is sectional drawing which follows the II plane of FIG. It is a functional block diagram of the human body part detection apparatus shown in FIGS. 1 and 2. It is a flowchart which shows the process flow of the human body part detection apparatus of 1st Embodiment. It is a graph which shows the temperature change example and a heater drive region in 1st Embodiment. It is a graph which shows the temperature change example and the cooling body drive region in the modification of 1st Embodiment. It is a perspective view which shows the whole structure of the 3D input device which concerns on 2nd Embodiment. 6 is a cross-sectional view taken along the VIII plane of FIG. 6 is a functional block diagram of the three-dimensional input device shown in FIGS. 6 and 7. (A) and (B) are monitor diagrams showing an image example of an input terminal displayed in a projective space region, respectively. It is a flowchart which shows the flow of operation of the 3D input device of 2nd Embodiment. It is a flowchart which shows the flow of operation of the 3D input device of 3rd Embodiment.

Hereinafter, the human body part detection device and the three-dimensional input device including the human body part detection device according to the embodiment of the present invention will be described in detail with reference to the drawings.

<First Embodiment>
As shown in FIG. 1 or 2, the human body part detecting device 10 according to the present embodiment includes a device main body 11, a pyroelectric infrared sensor 20 provided on the device main body 11, and a heater as a temperature adjusting means. 40 and. Further, as shown in FIG. 3, the human body part detection device 10 includes a temperature calculation unit 21 and a control unit 50 that also has a function as a recognition unit.

The apparatus main body 11 includes a mounting portion 12, a support portion 13, and an upper housing portion 14. The mounting portion 12 is mounted on a fixed table or the like and has a plate-like shape. The upper housing portion 14 is provided on the upper portion of the support portion 13 extending upward from the mounting portion 12, and is arranged so as to face each other with the mounting portion 12. A detection space 15 is formed between the mounting portion 12 and the upper housing portion 14.

A pyroelectric infrared sensor 20 is provided on the upper housing portion 14. The pyroelectric infrared sensor 20 receives infrared light IR incident from the detection space 15 side, so that the electrical properties of the light receiving element change. Examples of the light receiving element used in the pyroelectric infrared sensor 20 include a thermoelectric element, a pyroelectric element, and a bolometer.

Changes in the electrical properties of the light receiving element of the pyroelectric infrared sensor 20, for example, changes in the current value due to the generation of electromotive force are output to the temperature calculation unit 21, where the amount of change in temperature is calculated. The calculated temperature change amount is output to the control unit 50.

Based on the temperature detected by the charcoal-type infrared sensor 20, the control unit 50 does not overlap the temperature of the detection space 15 with the normal temperature range of a person, and has a temperature range higher than the normal temperature range (set temperature range). ) Is output to the heater drive unit 41 to control the drive of the heater 40 as the temperature adjusting means. Here, the normal temperature range of a person is, for example, 35 ° C to 37 ° C (35 ° C or more and 37 ° C or less), but the lower limit temperature can be set to a temperature higher than 35 ° C, and the upper limit temperature can be set. Can also be at temperatures below or above 37 ° C.

The heater 40 is provided in the mounting portion 12 at a position directly below the detection space 15 so as to face the pyroelectric infrared sensor 20. The heater 40 is composed of, for example, a heating plate or a thermistor.

The set temperature range is a temperature range higher than the normal temperature range of a person, and can be set to any range. This set temperature region may be, for example, the entire temperature range above 37 ° C, but the upper limit may be set to, for example, 50 ° C or less. If the lower limit of the set temperature range is set to a temperature slightly higher than the upper limit of the normal temperature range, for example, when the upper limit of the normal temperature range is 37 ° C, the lower limit of the set temperature range is 37.5. When set to ° C, it becomes easy to prevent erroneous detection when a finger of a person having a slightly high heat is inserted into the detection space 15. In the example shown in FIG. 5, the set temperature region is set to a temperature exceeding 37 ° C (first temperature region), and the temperature of the detection space 15 changes with the passage of time to 37 ° C or less. The heater 40 is driven in the region (heater drive region) at the time when the temperature becomes, and the temperature is recovered to exceed 37 ° C. at the subsequent time.

When the set temperature region is set in this way and the temperature of the detection space 15 is controlled to maintain the set temperature region, a human body part having a temperature lower than the set temperature region, such as fingers, hands, toes, and feet, is used. Is inserted into the detection space 15, the focal infrared sensor 20 can detect the far infrared rays emitted from the human body part, and the control unit 50 as a recognition unit is based on the temperature change of the detection space 15. Recognizes the insertion of a human body part. On the other hand, when the insect temporarily invades the detection space 15, the insect passes through the air directly under the pyroelectric infrared sensor 20 for a moment, so that the far-infrared radiation caused by this passage is extremely small. Since it is an amount, it is not detected by the pyroelectric infrared sensor 20, and the invasion of insects is not recognized. Further, even if insects stop on the surfaces of the mounting portion 12, the support portion 13, and the upper housing portion 14 constituting the detection space 15, they are not directly under the pyroelectric infrared sensor 20. Since far-infrared light is not detected, there is no risk of erroneous detection as an insertion of a human body part.

The processing flow of the human body part detecting apparatus 10 will be described with reference to FIG.
When the power-on signal is input (step S11), the control unit 50 starts operation, operates the pyroelectric infrared sensor 20 (presence sensor) and the temperature calculation unit 21, and changes the temperature in the detection space 15. The measurement is started (step S12). The power-on signal is generated by the operation of the user, and is given when the elevator is started, for example, when the human body part detecting device 10 is installed in the elevator.

The detection result by the pyroelectric infrared sensor 20 is output to the temperature calculation unit 21 at a predetermined time interval (for example, every 0.5 seconds), and the temperature calculated by the temperature calculation unit 21 is given to the control unit 50. Be done.

Each time the calculated temperature is given by the temperature calculation unit 21, the control unit 50 compares with a set temperature region previously stored in a storage unit (not shown) (step S13).

When the control unit 50 determines in step S3 that the temperature of the detection space 15 is lower than the set temperature region, the control unit 50 outputs a drive signal to the heater drive unit 41 so as to drive the heater 40 (step S17). .. After that, the control unit 50 continues the comparison between the temperature of the detection space 15 and the set temperature region (step S13), and continues to drive the heater 40 while the temperature is lower than the set temperature region. Here, when the temperature of the place where the human body part detection device 10 is installed is equal to or lower than the normal temperature range of the human body, it is preferable to constantly drive the heater 40. On the other hand, the operable temperature range of the heater 40 can be limited from the viewpoint of power saving and the like. For example, it can be set so that the heater 40 can generate heat at 25 ° C. or higher. When such a setting is made, when the environmental temperature is less than 25 ° C, heating by the heater 40 is not possible, so an error display or a display recommending replacement with a device using a cooling body instead of the heater 40. It is preferable to do such things.
Through the above steps, the temperature of the detection space 15 is maintained in the set temperature region (detection space temperature setting step).

When the control unit 50 determines that the temperature of the detection space 15 is higher than the set temperature region in step S3, the control unit 50 detects a change in the temperature of the detection space 15 based on the calculated temperature given by the temperature calculation unit 21. Execute (step S14).

Further, the control unit 50 determines whether or not the detected temperature is within the normal temperature range (body temperature region) of the human body (step S15). The normal heat temperature range is set to, for example, 35 ° C or higher and 37 ° C or lower. The determination in step S15 is that, for example, when the human body part detection device 10 is installed in the elevator, the elevator door is opened or the user enters the elevator room. Starts when detected by the sensor.

In step S15, while the temperature of the detection space 15 has not dropped into the normal temperature range (body temperature region), the temperature detection of the detection space 15 (step S14) and the comparison between the normal temperature range (step S15) are repeated. ..

On the other hand, when the temperature of the detection space 15 falls within the normal heat temperature range, the control unit 50 recognizes that the human body portion is inserted into the detection space 15 as a recognition unit. As described above, in steps S14 to S16, the temperature change when the human body part is inserted into the detection space 15 is detected (human body part insertion detection step).

Here, when an external device is connected to the human body part detection device 10, an instruction signal indicating that the human body part has been inserted is output to the external device. For example, when a display device or a light emitting device is connected as an external device, a display indicating that a human body part has been inserted or light emission is performed.

Further, the control unit 50 has a case where the temperature of the detection space 15 gradually decreases due to the influence of the temperature of the place where the human body part detection device 10 is installed, and a case where the human body part such as a finger is inserted into the detection space 15 and the temperature is steep. It is preferable to have a threshold value for discriminating the speed of temperature change in order to distinguish from the case where the temperature changes. This threshold value can be arbitrarily set according to the temperature of the installation location, the output of the heater 40, etc., but for example, when the temperature drops by 3 ° C or more in a time of 3 seconds or less, the human body part is inserted. The above threshold value can be set so as to recognize the object.

Based on the above configuration, according to the human body part detection device 10 of the first embodiment, the pyroelectric infrared sensor is not affected by the rise or fall of the temperature in the environment in which the human body part detection device 10 is placed. At 20, it becomes possible to reliably detect that a finger F or the like, which is a human body part, has been inserted into the detection space 15. Then, the human body part detection device 10 can be operated more accurately than before without being affected by the invasion of insects, etc., and is a non-contact, high-performance human body part detection device effective for infection prevention measures, for example, by a virus. Can be provided.

Here, a modified example of the first embodiment will be described.
In the first embodiment, the heater 40 is used as the temperature adjusting means, and the temperature is raised when the human body part detection device 10 is arranged in an environment where the temperature of the detection space 15 is equal to or lower than the normal temperature range of the human body. rice field. On the other hand, in the modified example, the temperature of the detection space 15 is used as a temperature adjusting means in case the human body part detection device 10 is placed in an environment where the environmental temperature is higher than the normal temperature range of the human body. A cooling body is provided to reduce the temperature. As the cooling body, for example, a Pelche element is used. Instead of the heater 40, the cooling body is provided in the mounting portion 12 at a position directly below the detection space 15 so as to face the pyroelectric infrared sensor 20.

In this modification, the control unit 50 is a temperature adjusting means so that the temperature of the detection space 15 does not overlap with the normal temperature range of a person and maintains a temperature range (set temperature range) lower than the normal temperature range. The cooling body is driven and controlled.

The set temperature range in this case is a temperature range lower than the normal temperature range of a person, and can be set to any range. This set temperature range can be, for example, the entire temperature range below 35 ° C. In the example shown in FIG. 6, the set temperature region is set to a temperature region below 35 ° C (second temperature region below 35 ° C), and the temperature of the detection space 15 changes with the passage of time. Then, the cooling body is driven in the region (cooling body driving region) at the time when the temperature becomes 35 ° C or higher, and the temperature is restored to the temperature not exceeding 35 ° C at the subsequent time.

When the set temperature region is set in this way and the temperature of the detection space 15 is controlled to maintain the set temperature region, when a human body part having a temperature higher than the set temperature region, for example, a finger, is inserted into the detection space 15. The focal infrared sensor 20 can detect the far infrared rays radiated from the human body part, and the control unit 50 as the recognition unit recognizes the insertion of the human body part based on the temperature change of the detection space 15.

<Second Embodiment>
As shown in FIG. 7 or 8, the three-dimensional input device 110 according to the second embodiment includes a device main body 111, a pyroelectric infrared sensor 120 provided on the device main body 111, an image display unit 130, and an image display unit 130. A heater 140 is provided. Further, as shown in FIG. 9, the three-dimensional input device 110 includes a temperature calculation unit 121, an image generation unit 131, a heater drive unit 141, and a control unit 150.

The apparatus main body 111 includes a mounting portion 112, a support portion 113, and an upper housing portion 114. The mounting portion 112 is mounted on a fixed table or the like and has a plate-like shape. The upper housing portion 114 is provided on the upper portion of the support portion 113 extending upward from the mounting portion 112, and is arranged so as to face each other with the mounting portion 112. A detection space 115 is formed between the mounting portion 112 and the upper housing portion 114. The detection space 115 has a projection space region AP described later.

A pyroelectric infrared sensor 120 is provided on the upper housing portion 114. The pyroelectric infrared sensor 120 receives the infrared light IR incident from the detection space 115, so that the electrical properties of the light receiving element change. Examples of the light receiving element used in the pyroelectric infrared sensor 120 include a thermoelectric element, a pyroelectric element, and a bolometer.

Changes in the electrical properties of the light receiving element of the pyroelectric infrared sensor 120, for example, changes in the current value due to the generation of electromotive force, are output to the temperature calculation unit 121, where the amount of change in temperature is calculated. The calculated temperature rise amount is output to the control unit 150.

The image display unit 130 is, for example, lenticular, and projects (displays) a predetermined image on the projection space area AP directly below the pyroelectric infrared sensor 120 in the detection space 115. This image is an image that can be visually recognized by the user of the device with the eye E, and as shown in FIGS. 10A and 10B, in a plurality of constituent images, for example, FIG. 10A. The image or video of the switch (input terminal) between "OPEN open" and "CLOSE closed" and the image (video) of the switch (input terminal) with numbers 0 to 9 in FIG. 10B can be distinguished from each other. It is displayed in the state of. The video signal of the displayed video is stored in the video generation unit 131 in advance, and the control unit 150 displays the control signal for selecting the video according to the usage status of the device and the operation status of the device by the user. Output to the generation unit 131. The video generation unit 131 selects a video signal according to the control signal received from the control unit 150 and outputs the video signal to the video display unit 130, and the video corresponding to the video signal is displayed by the video display unit 130.

Since the pyroelectric infrared sensor 120 is arranged above the projection space region AP, the electrical properties of the light receiving element change according to the temperature of the projection space region AP.

Similar to the control unit 50 in the first embodiment, the control unit 150 does not overlap the temperature of the detection space 115 with the normal temperature range of a person based on the temperature detected by the charcoal-type infrared sensor 120. A drive signal is output to the heater drive unit 141 so as to maintain a temperature region (set temperature region) higher than the normal temperature range, thereby controlling the drive of the heater 140 as a temperature adjusting means. Here, the normal temperature range of a person is, for example, 35 ° C to 37 ° C (35 ° C or more and 37 ° C or less), but the lower limit temperature can be set to a temperature higher than 35 ° C, and the upper limit temperature can be set. Can also be at temperatures below or above 37 ° C.

The heater 140 is provided in the mounting portion 112 so as to face the pyroelectric infrared sensor 120 at a position directly below the projection space region AP. The heater 140 is composed of, for example, a heating plate or a thermistor.

The set temperature region is the same as that of the first embodiment, is a temperature region higher than the normal heat temperature range of a person, and can be set to any range. This set temperature region may be, for example, the entire temperature range above 37 ° C, but the upper limit may be set to, for example, 50 ° C or less. If the lower limit of the set temperature range is set to a temperature slightly higher than the upper limit of the normal temperature range, for example, when the upper limit of the normal temperature range is 37 ° C, the lower limit of the set temperature range is 37.5. When set to ° C, it becomes easy to prevent false detection when a finger of a person having a slightly high heat is inserted into the projection space area AP. In the example shown in FIG. 5, the set temperature region is set to a temperature region (first temperature region) exceeding 37 ° C, and the temperature of the projection space region AP (detection space 115) changes with the passage of time. Among them, the heater 140 is driven in the region (heater drive region) at the time when the temperature becomes 37 ° C or less, and the temperature recovers to the temperature exceeding 37 ° C at the subsequent time.

When the set temperature region is set in this way and the temperature of the projection space region AP is controlled to maintain the set temperature region, a human body part having a temperature lower than the set temperature region, for example, a finger, is inserted into the projection space region AP. Then, the focal infrared sensor 120 can detect the far infrared rays radiated from the human body part, and the control unit 150 as the recognition unit recognizes the insertion of the human body part based on the temperature change of the detection space 115. do. On the other hand, when an insect temporarily invades the detection space 115, the insect passes through the air directly under the pyroelectric infrared sensor 120 for a moment, so the radiation of far infrared rays due to this passage is extremely small. Since it is an amount, it is not detected by the pyroelectric infrared sensor 120, and the invasion of insects is not recognized, as in the first embodiment.

With reference to FIG. 11, the processing flow of the three-dimensional input device 110 of the second embodiment will be described.
When the power-on signal is input (step S21), the control unit 150 starts operation, operates the pyroelectric infrared sensor 120 (presence sensor) and the temperature calculation unit 121, and changes the temperature in the projection space region AP. (Step S22). The power-on signal is generated by the operation of the user, and is given when the elevator is started, for example, when the three-dimensional input device 110 is installed in the elevator.

The detection result by the pyroelectric infrared sensor 120 is output to the temperature calculation unit 121 at a predetermined time interval (for example, every 0.5 seconds), and the temperature calculated by the temperature calculation unit 121 is given to the control unit 150. Be done.

Each time the calculated temperature is given by the temperature calculation unit 121, the control unit 150 compares it with a set temperature region previously stored in a storage unit (not shown) (step S23).

When the control unit 150 determines in step S23 that the temperature of the projection space region AP is lower than the set temperature region, the control unit 150 outputs a drive signal to the heater drive unit 141 so as to drive the heater 140 (step S28). ). After that, the control unit 150 continues the comparison between the temperature of the projection space region AP and the set temperature region (step S23), and continues to drive the heater 140 while the temperature is lower than the set temperature region. Here, when the temperature of the place where the three-dimensional input device 110 is installed is equal to or lower than the normal temperature range of the human body, it is preferable to constantly drive the heater 140.
Through the above steps, the temperature of the projective space region AP is maintained in the set temperature region (detection space temperature setting step).

When the control unit 150 determines that the temperature of the projection space region AP is higher than the set temperature region in step S23, the control unit 150 changes the temperature of the projection space region AP based on the calculated temperature given by the temperature calculation unit 121. The detection is executed (step S24).

Further, the control unit 150 determines whether or not the detected temperature is within the normal temperature range (body temperature region) of the human body (step S25). The normal heat temperature range is set to, for example, 35 ° C or higher and 37 ° C or lower. The determination in step S25 is that, for example, when the three-dimensional input device 110 is installed in the elevator, the elevator door is opened or the user enters the elevator room. Starts when detected by the sensor.

In step S25, while the temperature of the projection space region AP has not dropped into the normal temperature range (body temperature region), the image is not displayed in the projection space region AP and is not displayed at regular time intervals (for example, 0.5). Every second), the determination in step S25 is continued.

On the other hand, when the temperature of the projective space region AP falls within the normal heat temperature range, the control unit 150 recognizes that the human body portion is inserted into the projective space region AP as a recognition unit. As described above, in steps S24 to S25, the temperature change when the human body part is inserted into the projective space region AP is detected (human body part insertion detection step).

When it is determined in step S25 that it is in the body temperature region, the control unit 150 outputs an instruction signal to the image generation unit 131 so that the image display unit 130 displays the image. The video generation unit 131 outputs the video signal of the corresponding video to the video display unit 130 according to the control signal given from the control unit 150, whereby the video is displayed in the projection space region AP (step S26). When the user performs a contact operation with respect to the image (input terminal) displayed in the projection space area AP, the target input signal is transmitted to the device corresponding to the input terminal (step S27). Here, the image display unit 130, the pyroelectric infrared sensor 120, the temperature calculation unit 121, and the control unit 150 are. When the insertion of the human body part into the projection space region AP is recognized, the projection space region AP displays the image or video of the input terminal, and the human body with respect to the image or video of the input terminal displayed in the projection space region AP. It functions as a detection input means that detects contact between parts and enables input of a target signal.

Since it is configured as described above, according to the three-dimensional input device 110 of the second embodiment, the pyroelectric infrared sensor 120 is not affected by the temperature change in the environment in which the three-dimensional input device 110 is placed. , It is possible to reliably detect that a finger F or the like, which is a human body part, has been inserted into the projection space region AP. Then, the three-dimensional input device 110 can be operated more accurately than before, and it becomes possible to provide a high-performance three-dimensional input device that is non-contact and effective for infection prevention measures due to, for example, a virus.

<Third Embodiment>
In the second embodiment, the heater 140 is used as the temperature adjusting means so that the temperature of the projection space region AP is maintained higher than the normal temperature range of the human body, whereas in the third embodiment shown in FIG. In the embodiment, the temperature is such that the temperature of the projected space region AP can be maintained in a temperature region below the normal temperature range of the human body, for example, in a second temperature region below 35 ° C. as shown in FIG. As the adjusting means, instead of the heater 140 of the second embodiment, a cooling body for lowering the temperature of the projected space region AP is provided. The cooling body is driven by a drive signal from the cooling body driving unit, and the cooling body driving unit is driven by a control signal from the control unit 150. Since the other configurations are the same as those of the second embodiment, detailed description thereof will be omitted.

As the cooling body, for example, a Pelche element is used. Instead of the heater 140 in the second embodiment, the cooling body is provided in the mounting portion 112 at a position directly below the projection space region AP so as to face the pyroelectric infrared sensor 120.

Here, if the temperature of the projection space region AP can be adjusted, the air conditioner provided at the installation location of the three-dimensional input device 110 is used as the cooling body and the cooling body driving unit, and is connected to the control unit 150 to connect the air conditioner. The operation may be controlled.

With reference to FIG. 12, the processing flow of the three-dimensional input device 110 according to the third embodiment will be described. Detailed description of the same processing as in the second embodiment may be omitted.

When the power-on signal is input (step S31), the control unit 150 starts operation, operates the pyroelectric infrared sensor 120 (presence sensor) and the temperature calculation unit 121, and changes the temperature in the projection space region AP. (Step S32). The generation of the power-on signal is the same as that of the second embodiment.

The detection result by the pyroelectric infrared sensor 120 is output to the temperature calculation unit 121 at a predetermined time interval (for example, every 0.5 seconds), and the temperature calculated by the temperature calculation unit 121 is given to the control unit 150. Be done.

Each time the calculated temperature is given by the temperature calculation unit 121, the control unit 150 compares the temperature with the set temperature stored in advance in the storage unit (not shown) (step S33).

When the control unit 150 determines in step S33 that the temperature of the projection space region AP is higher than the set temperature region in step S33, the control unit 150 outputs a drive signal to the cooling body driving unit so as to drive the cooling body. (Step S38). After that, the control unit 150 continues the comparison between the temperature of the projection space region AP and the set temperature region (step S33), and continues to drive the cooling body while the temperature is higher than the set temperature region. Here, when the temperature of the place where the three-dimensional input device 110 is installed is equal to or higher than the normal temperature range of the human body, it is preferable to keep the cooling body always driven. On the other hand, the operable temperature of the cooling body can be limited from the viewpoint of power saving and the like. For example, cooling by a cooling body can be set so as to be possible in a temperature range of 25 ° C. or higher.
Through the above steps, the temperature of the projective space region AP is maintained in the set temperature region (detection space temperature setting step).

When the control unit 150 determines that the temperature of the projection space region AP is lower than the set temperature region in step S33, the change in the temperature of the projection space region AP is based on the calculated temperature given by the temperature calculation unit 121. The detection is executed (step S34).

Further, the control unit 150 determines whether or not the detected temperature is within the normal temperature range (body temperature region) of the human body (step S35). The determination in step S35 is that, for example, when the three-dimensional input device 110 is installed in the elevator, the elevator door is opened or the user enters the elevator room. Starts when detected by the sensor.

In step S35, while the temperature of the projection space region AP has not risen within the normal heat temperature range (body temperature region), the image is not displayed in the projection space region AP, and the image is not displayed every integrated time (for example, 0.5). Every second), the determination in step S35 is continued.

On the other hand, when the temperature of the projective space region AP falls within the normal heat temperature range, the control unit 150 recognizes that the human body portion is inserted into the projective space region AP as a recognition unit. As described above, in steps S34 to S35, the temperature change when the human body part is inserted into the projective space region AP is detected (human body part insertion detection step).

When it is determined in step S35 that it is in the body temperature region, the control unit 150 outputs an instruction signal to the image generation unit 131 so that the image display unit 130 displays the image. The video generation unit 131 outputs the video signal of the corresponding video to the video display unit 130 according to the control signal given from the control unit 150, whereby the video is displayed in the projection space region AP (step S36). When the user performs an operation on the image (input terminal) displayed in the projection space area AP, the target input signal is transmitted to the device corresponding to the input terminal (step S37).
Although the present invention has been described with reference to the above embodiments, the present invention is not limited to the above embodiments, and can be improved or modified within the scope of the purpose of improvement or the idea of the present invention.

10 Human body part detection device 11 Device body 12 Mounting part 13 Support part 14 Upper housing part 15 Detection space 20 Pyroelectric infrared sensor 21 Temperature calculation unit 40 Heater (temperature adjusting means)
41 Heater drive unit 50 Control unit (recognition unit)
110 Three-dimensional input device 111 Device main body 112 Mounting part 113 Support part 114 Upper housing part 115 Detection space 120 Pyroelectric infrared sensor 121 Temperature calculation unit 130 Image display unit 131 Image generation unit 140 Heater (temperature adjusting means)
141 Heater drive unit 150 Control unit (recognition unit)
AP Projective space area E Eye F Finger (human body part)
IR infrared

Claims (9)

It is a human body part detection device that detects that a human body part has been inserted into the detection space.
A charcoal-type infrared sensor that receives infrared light radiated from the detection space side and can measure the temperature of the detection space.
A temperature adjusting means that can adjust the temperature in the detection space,
Based on the result of detection by the pyroelectric infrared sensor, a control unit that controls the temperature adjusting means so as to maintain a constant set temperature range in which the temperature of the detection space does not overlap with the normal temperature range of a person. Equipped with
The control unit is a human body part detection device, characterized in that it recognizes that the human body part is inserted into the detection space based on a change in temperature of the detection space detected by the pyroelectric infrared sensor. The human body part detection device according to claim 1, wherein the temperature adjusting means is arranged so as to face the pyroelectric infrared sensor with the detection space interposed therebetween. The normal heat temperature range is in the range of 35 ° C to 37 ° C.
When a first temperature region exceeding 37 ° C is set as the set temperature region, a heater is arranged as the temperature adjusting means, and a second temperature region less than 35 ° C is set as the set temperature region. The human body part detecting device according to claim 2, wherein a cooling body is arranged as the temperature adjusting means. The image or video of the input terminal is displayed in the projection space area, and the insertion of the human body part consisting of a human finger or hand is detected in the image or video of the input terminal displayed in the projection space area, and the input terminal is displayed. A three-dimensional input device that enables input of information corresponding to images or videos.
A pyroelectric infrared sensor that receives infrared light radiated from the projection space region side and can measure the temperature of the projection space region.
A temperature adjusting means that can adjust the temperature in the projective space region,
Based on the result of detection by the pyroelectric infrared sensor, a control unit that controls the temperature adjusting means so as to maintain a constant set temperature region in which the temperature of the projected space region does not overlap with the normal temperature range of a person. , Equipped with
The control unit recognizes that the human body portion is inserted into the detection space based on the change in temperature of the detection space detected by the pyroelectric infrared sensor.
When the insertion of the human body portion is recognized, the three-dimensional input device causes the image or video of the input terminal to be displayed in the projection space region, and the image of the input terminal displayed in the projection space region. Alternatively, a three-dimensional input device further comprising a detection input means capable of detecting a contact of the human body part with an image and inputting a target signal. According to claim 4, the normal temperature range is in the range of 35 ° C to 37 ° C, and the set temperature range is a first temperature range exceeding 37 ° C or a second temperature range of less than 35 ° C. The described three-dimensional input device. The set temperature region is the first temperature region exceeding 37 ° C.
The detection input means is arranged at a position directly below the projection space region when the temperature of the projection space region detected by the focal infrared sensor is lower than the temperature of the first temperature region. The three-dimensional input device according to claim 5, wherein a heater as a temperature adjusting means is driven to set the temperature of the projected space region to a temperature of the first temperature region or higher. The three-dimensional input device according to claim 6, wherein the heater is either a heating plate or a thermistor. The set temperature region is the second temperature region of less than 35 ° C.
The detection input means is arranged at a position directly below the projection space region when the temperature of the projection space region detected by the focal infrared sensor is higher than the temperature of the second temperature region. The three-dimensional input device according to claim 5, wherein a cooling body as a temperature adjusting means is driven so that the temperature in the projected space region is set to a temperature in the second temperature region or lower. The three-dimensional input device according to claim 8, wherein the cooling body is a Pelche element.

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