Gas detector

Abstract

To provide a gas detector into which a person other than a subject in place of the subject is made difficult to blow breath.SOLUTION: A gas detector 10 is configured so that, when exhaled air is blown into an exhalation flow path 12 through a mouthpiece 30, a pressure sensor 15 detects a pressure above a predetermined pressure, enabling a controller that is a microcomputer 40, to perform detection using a gas sensor 16, and when the mouthpiece 30 is removed, a gap through which exhaled air leaks is created between a blow-in port 18 and a deflector 20, and exhaled air is then blown into the blow-in port 18, so that the pressure sensor 15 does not detect a pressure above the predetermined pressure, maintaining a state in which the controller cannot perform detection using the gas sensor 16.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a gas detector. [Background technology]

[0002] Conventionally, a gas detector as described in Patent Document 1 has been known as a type of bioinformation measuring device. The gas detector described in Patent Document 1 is used, for example, to detect the alcohol concentration in breath and test the degree of intoxication due to drinking. The gas detector in Patent Document 1 is structured so that when a subject blows breath into the mouth of the detector, the breath introduced through the mouth comes into contact with a gas sensor, thereby detecting the concentration of gas contained in the breath. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2022-22754 Summary of the Invention [Problem to be solved by the invention]

[0004] If a subject can correctly blow his / her breath into a gas detector and detect, for example, the alcohol concentration in the breath, the data from the gas detector can be used to manage the safety of the subject's work. However, it is known that a person other than the subject may blow his / her breath into a gas detector on behalf of the subject. For example, when the subject is aware that his / her breath contains alcohol, another person who has almost no alcohol in his / her breath may blow his / her breath into the gas detector instead, which is known as impersonation. In this type of impersonation, a large proportion of cases involve someone holding a straw different from the one the subject is holding in their mouth and blowing the breath of the other person into the gas detector through the straw that the other person is holding. If impersonation becomes widespread, it could lead to situations where, for example, people under the influence of alcohol are involved in work, making it difficult to ensure the safety of work involving subjects.

[0005] An object of the present invention is to provide a gas detector which makes it difficult for a person other than the subject to blow breath into the detector in place of the subject. [Means for solving the problem]

[0006] In the following, several aspects will be described as means for solving the problems. These aspects can be arbitrarily combined as necessary. The gas detector according to the first aspect includes an exhalation flow path, a sampling flow path, a deflector, a mouthpiece, a pressure sensor, a gas sensor, and a controller. The exhalation flow path has an inlet and an outlet, and is a flow path through which the exhalation flows from the inlet to the outlet by the pressure of the exhalation blown by the subject. The sampling flow path is a flow path that branches off from the exhalation flow path and takes in the exhalation from the exhalation flow path. The deflector is a member that is disposed in front of the inlet and deflects the airflow toward the inlet. The mouthpiece has a specific shape that is detachable from the exhalation flow path, and a blowing flow path that positions the deflector inside when attached, and has a structure that sends the exhalation to the blowing port by bypassing the deflector with the blowing flow path. The pressure sensor is a sensor that is disposed in the sampling flow path and detects the pressure of the air in the sampling flow path. The gas sensor is a sensor that is disposed in the sampling flow path and detects the concentration of a predetermined gas in the exhalation taken into the sampling flow path. The controller is connected to the pressure sensor and the gas sensor. The gas detector is configured so that when exhaled air is blown into the exhalation flow path through the mouthpiece, the pressure sensor detects a pressure above a predetermined pressure, enabling the controller to perform detection using the gas sensor, and when the mouthpiece is removed, a gap is created between the blowing opening and the deflector through which exhaled air can leak, and then exhaled air is blown into the blowing opening, so that the pressure sensor does not detect a pressure above the predetermined pressure, thereby maintaining a state in which the controller cannot perform detection using the gas sensor. In the gas detector of the first aspect, if the subject tries to blow breath into a tube such as a straw other than the mouthpiece having a specific shape, the mouthpiece is removed, and a gap through which the breath leaks is generated between the mouthpiece and the deflector, and the breath is blown into the mouthpiece in this state. As a result, the pressure sensor does not detect a pressure equal to or higher than the predetermined pressure, and the controller cannot perform detection by the gas sensor, so it becomes difficult for a person other than the subject to receive detection of the predetermined gas in the breath without using the mouthpiece.

[0007] The gas detector according to the second aspect is the gas detector according to the first aspect, in which the breath flow path has a rib extending from the blowing port toward the downstream of the breath flow path on the inner wall of the breath flow path. In the gas detector according to the second aspect thus configured, the rib prevents a cylinder such as a straw from being inserted into the breath flow path, so that a gap through which breath leaks is likely to be generated between the blowing port and the deflector. As a result, the pressure sensor is likely to fail to detect a pressure equal to or higher than a predetermined pressure, and the controller is likely to be unable to perform detection by the gas sensor, making it even more difficult for someone other than the subject to receive gas detection in place of the subject without using a mouthpiece. The gas detector according to the third aspect is configured such that, in the gas detector of the first or second aspect, it is provided with a support protrusion that extends to the deflector and supports the deflector, and the mouthpiece has a slit into which the support protrusion fits. In the gas detector of the third aspect thus configured, the periphery of the slit of the mouthpiece can be supported by the support protrusion, so that a gap is unlikely to form between the mouthpiece and the mouthpiece, and it becomes easier to realize a state in which the pressure sensor detects a pressure equal to or higher than a predetermined pressure and the controller can perform detection by the gas sensor.

[0008] The gas detector according to the fourth aspect is the gas detector according to any one of the first to third aspects, in which the deflector has an outer shape equal to or larger than that of the blow inlet when viewed in the direction in which the breath flow path extends from the blow inlet. In the gas detector according to the fourth aspect thus configured, the deflector prevents a cylinder such as a straw from being inserted into the breath flow path in the direction in which the breath flow path extends from the blow inlet, so that a gap through which the breath leaks is likely to be generated between the blow inlet and the deflector. As a result, the pressure sensor is likely to fail to detect a pressure equal to or higher than a predetermined pressure, and the controller is likely to be unable to perform detection by the gas sensor, making it even more difficult for a person other than the subject to receive gas detection in place of the subject without using a mouthpiece. Effect of the Invention

[0009] The gas detector according to the present invention makes it difficult for a person other than the subject to blow breath into the subject, and can prevent the subject from using the gas detector fraudulently. [Brief description of the drawings]

[0010] [Figure 1] FIG. 2 is a diagram for explaining use of a gas detector by a subject. [Diagram 2] FIG. 2 is a block diagram showing an example of equipment related to management using the gas detector according to the first embodiment. [Diagram 3] FIG. 2 is a conceptual diagram for explaining an exhalation flow path and a sampling flow path of the gas detector according to the first embodiment. [Figure 4] FIG. 2 is a side view of the gas detector. [Diagram 5] FIG. 5 is a side view of a flow path component having a mouthpiece attached to the gas detector of FIG. 4. [Figure 6] FIG. 5 is a plan view of a flow path component to which the mouthpiece of the gas detector of FIG. 4 is attached. [Figure 7] FIG. [Figure 8] FIG. 2 is a perspective view of the mouthpiece as viewed from the mouthpiece inlet. [Figure 9] FIG. 2 is a perspective view of the mouthpiece as viewed from the mouthpiece outlet. [Figure 10] 7 is a cross-sectional view of the mouthpiece and the flow path part taken along line II-II in FIG. 6. [Figure 11] 6 is a cross-sectional view of the mouthpiece and the flow path part taken along line II in FIG. 5. [Figure 12] FIG. [Figure 13] 13 is a cross-sectional view of the flow path component taken along line III-III in FIG. 12. [Figure 14] 11A and 11B are diagrams for explaining the airflow of exhaled air blown onto a flow path part using a straw. [Figure 15] FIG. 2 is a diagram for explaining the airflow of exhaled air blown into a mouthpiece. [Figure 16]FIG. 2 is an enlarged perspective view of a portion of a flow path component with a mouthpiece attached. [Figure 17] FIG. 2 is an enlarged perspective view of a portion of the flow path component with the mouthpiece removed. [Figure 18] FIG. 2 is an enlarged perspective view of a portion of the flow path component with the deflector removed. [Figure 19] 11 is a flowchart for explaining a management method using a gas detector. [Figure 20] FIG. 11 is a block diagram showing an example of equipment involved in management using a gas detector according to a second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] First Embodiment (1) Overview of gas detector management FIG. 1 shows a state in which the concentration of a predetermined gas in the exhaled breath of a subject 300 is being detected during management using a gas detector 10 and related equipment shown in FIG. For example, the subject 300 is managed using the gas detector 10, an external computer 50 which is a management device, and a certification device 60. The external computer 50 is a management device which manages the detection results of the gas detector. The certification device 60 has an imaging device 61 for photographing the gas detector 10, and a communication unit 62 which transmits an image photographed by the imaging device 61. The imaging device 61 is, for example, a camera or a video recorder. The communication unit 62 is configured to be able to communicate with the transmission / reception device 47 and the external computer 50. The certification device 60 can be configured using, for example, a smartphone, in which case the imaging device 61 is, for example, a camera of the smartphone, and the communication unit 62 is, for example, a mobile information terminal of the smartphone. The smartphone can transmit an image photographed in the state shown in FIG. 1, for example, by data communication (for example, mobile data, Wi-Fi (registered trademark)), a messaging application (for example, WhatsApp (registered trademark), Messenger (registered trademark), Line (registered trademark)), email, or cloud service.

[0012] (1-1) Overview of gas detectors As shown in Fig. 2, the gas detector 10 includes a microcomputer 40 as a controller. The microcomputer 40 is connected to a switch 42. The gas detector 10 is turned on by turning on the switch 42, and turned off by turning off the switch 42. The microcomputer 40 operates by receiving power from a power source 45. For example, a dry cell or an AC adapter is used as the power source 45. The microcomputer 40 is connected to a transmitting / receiving device 47. The transmitting / receiving device 47 can transmit a signal to the certification device 60 via a network. The certification device 60 can be configured using, for example, a smartphone. By starting an application installed on the smartphone, the smartphone can function as the certification device 60. Data for the certification device 60 to establish communication with the microcomputer 40 is incorporated in the application of the certification device 60. Networks used by the transmission / reception device 47 when transmitting include, for example, Pesticide Action Network International (PAN), local area network (LAN), and wide area network (WAN). Communication standards for PAN used by the transmission / reception device 47 include, for example, Bluetooth (registered trademark) and ZigBee (registered trademark). The microcomputer 40 is configured to be able to instruct the transmission / reception device 47 to transmit a trigger signal to the certification device 60.

[0013] The microcomputer 40 of the gas detector 10 is connected to the air pump 14, the pressure sensor 15, the gas sensor 16 and the temperature sensor 17. The microcomputer 40 receives data on the pressure of the air (exhaled breath) detected by the pressure sensor 15, data on the concentration of a predetermined gas detected by the gas sensor 16 and data on the temperature of the air (exhaled breath) detected by the temperature sensor 17. Since the gas sensor 16 is affected by the ambient temperature, the microcomputer 40 corrects the detection result of the gas sensor 16 based on the temperature detected by the temperature sensor 17 to calculate the concentration of the predetermined gas. The microcomputer 40 compares the air pressure detected by the pressure sensor 15 with a predetermined pressure and determines that the breath is continuing to be blown. If the pressure sensor 15 continues to detect a pressure equal to or higher than the predetermined pressure, the microcomputer 40 determines that the breath is continuing to be blown. If the pressure detected by the pressure sensor 15 falls below the predetermined pressure, the microcomputer 40 determines that the blowing has been interrupted and ends the detection of the breath. In response to a command from the microcomputer 40, the subject 300 who continues to blow is photographed. Therefore, in this gas detector 10, even if the pressure around the pressure sensor 15 increases for a very short time, the detection of the predetermined gas by the gas sensor 16 is not completed. When the microcomputer 40 detects that the breath is continuing to be blown by the pressure sensor 15, it drives the air pump 14 to collect the breath. The microcomputer 40 compares the concentration of a specific type of gas (predetermined gas) detected by the gas sensor 16 with a threshold value and determines that an alarm should be issued when the concentration of the gas exceeds the threshold value. If the gas detector 10 is a breathalyzer, the microcomputer 40 compares the alcohol concentration in the air detected by the gas sensor 16 with a threshold value. When the gas sensor 16 detects the concentration of gas, the microcomputer 40 corrects the concentration of gas detected by the temperature detected by the temperature sensor 17. The temperature sensor 17 can be, for example, a thermistor. The microcomputer 40 is connected to a display device 43. The microcomputer 40 transmits to the display device 43, for example, data for displaying the date and time and the detection result of the gas sensor 16. The microcomputer 40 is connected to an external computer 50, which is a management device. The microcomputer 40 can transmit data to the external computer 50, for example, via a bus 48 or a communication means. The microcomputer 40 transmits data to the external computer 50 for environment setting that enables communication between the certification device 60 and the external computer 50.

[0014] (1-2) Detailed configuration of the gas detector (1-2-1) Exhalation flow path and sampling flow path As shown in Figures 3 and 4, the gas detector 10 includes a main body 11 and a mouthpiece 30. The mouthpiece 30 is detachably attached to the main body 11. It is preferable that a mouthpiece 30 is prepared for each of the multiple subjects 300 in order to prevent infection with a disease caused by sharing the mouthpiece 30 among the multiple subjects 300. The mouthpiece 30 is made of, for example, resin. Examples of resins that can be used to make the mouthpiece 30 include polypropylene resin, polyethylene resin, ABS resin, acrylic resin, POM resin, PBT resin, and polyvinyl chloride. 3, the gas detector 10 includes an exhalation flow path 12 and a sampling flow path 13 in a main body 11. The exhalation flow path 12 has an inlet 18 and an outlet 19. The exhalation flow path 12 is configured such that the exhalation flows from the inlet 18 to the outlet 19 by the pressure of the exhaled breath blown in by the subject 300. In other words, the exhalation flow path 12 does not include any power device such as a fan or air pump for directing the exhaled breath from the inlet 18 to the outlet 19. The collection flow path 13 is a flow path branching off from the exhalation flow path 12. A pressure sensor 15 and a gas sensor 16 are disposed in the collection flow path 13. An air pump 14 is provided in the collection flow path 13. The air pump 14 operates when exhalation continues to flow through the exhalation flow path 12, and takes in the exhalation flowing through the exhalation flow path 12 into the collection flow path 13. A chamber CH that holds the exhalation is provided in the collection flow path 13, and the gas sensor 16 is configured to detect a predetermined gas in the exhalation filling the chamber CH.

[0015] (1-2-2) Mouthpiece For example, the subject 300 attaches a dedicated mouthpiece 30 to the mouth inlet 18 of the main body 11 when using the gas detector 10. 4 shows the gas detector 10 with the mouthpiece 30 attached, as viewed from the side. The mouthpiece 30 is attached, for example, at a predetermined angle with respect to the longitudinal direction in which the body 11 of the gas detector 10 extends. 5 and 6 show the mouthpiece 30 and a flow path part 70 in which the exhalation flow path 12 to which the mouthpiece 30 is attached is formed. The flow path part 70 is a part disposed inside the housing of the main body 11. When the flow path part 70 is attached to the main body 11, an outlet 71 of the flow path part 70 is connected to the exhaust port 19. The flow path part 70 is made of, for example, a resin. Examples of resins that can be used as the material for the flow path part 70 include polypropylene resin, polyethylene resin, ABS resin, acrylic resin, POM resin, PBT resin, and polyvinyl chloride. 7, 8 and 9 show the mouthpiece 30 alone. The mouthpiece 30 is a cylinder. The mouthpiece 30 has an airflow passage 31. An inlet 32 ​​of the airflow passage 31 is located in the mouth of the subject 300, and an outlet 33 of the airflow passage 31 is connected to the airflow inlet 18 of the main body 11. The inlet 32 ​​of the mouthpiece 30 is an elliptical opening. The outlet 33 of the mouthpiece 30 is basically square in shape. The corners of the outlet 33 are rounded. The airflow passage 31 has a narrowing portion from the inlet 32 ​​to the outlet 33. Two slits 34 are formed from the outlet 33 of the mouthpiece 30 toward the inlet 32.

[0016] (1-2-3) Deflector Fig. 10 shows a cross section of the mouthpiece 30 and the flow path part 70 taken along line II-II in Fig. 6. Fig. 11 shows a cross section of the mouthpiece 30 and the flow path part 70 taken along line II in Fig. 5. Fig. 12 shows the flow path part 70 alone. Fig. 13 shows a cross section of the flow path part 70 taken along line III-III in Fig. 12. The deflector 20 is disposed in front of the air inlet 18. The deflector 20 is molded into a shape that fits into the second rib portion 25b of the airflow part 70. The deflector 20 is fixed to the airflow part 70 by ultrasonic welding, for example. The deflector 20 is a member that deflects the airflow 410 toward the airflow part 18 (see FIG. 14). FIG. 14 shows a schematic diagram of a situation in which the exhaled air is blown toward the airflow part 18 with a straw 400 without the mouthpiece 30 attached. The straw 400 shown by the solid line and the straw 400 shown by the broken line blow the exhaled air toward the airflow part 18 from different directions. In both straws 400, the airflow is deflected by the deflector 20, and sufficient pressure cannot be generated in the exhaled air flow path 12. The deflector 20 has a rectangular parallelepiped space in the center of the cylinder and a groove on the outer periphery into which the second rib portion 25b fits. As shown in Fig. 10, when the mouthpiece 30 is attached to the main body 11, the deflector 20 is located in the blowing passage 31 of the mouthpiece 30. As shown in Fig. 15, the mouthpiece 30 has a structure in which the blowing passage 31 sends exhaled air to the blowing port 18 by bypassing the deflector 20.

[0017] (1-2-4) Ribs The rib 25 includes a first rib portion 25a formed on the inner wall of the exhalation flow path 12 and a second rib portion 25b extending outward from the blowing port 18 of the exhalation flow path 12. As shown in FIG. 11, two ribs 25 are provided on both sides of the deflector 20. Since the first rib portion 25a protrudes from the inner wall of the exhalation flow path 12, the space where the first rib portion 25a is provided is narrowed. This narrowing of the space makes it more difficult to insert the straw 400 into the exhalation flow path 12. The second rib portion 25b serves to fix the deflector 20 in front of the blowing port 18. The second rib portion 25b is a support protrusion that extends to the deflector 20 and supports the deflector 20. The second rib portion 25b fits into the slit 34 of the mouthpiece 30. The second rib portion 25b supports the periphery of the slit 34 and assists in fixing the mouthpiece 30. Although the number of ribs 25 is two in the embodiment shown here, the number of ribs 25 is not limited to two. The number of ribs 25 may be one, or three or more. In addition, all of the ribs 25 do not have to include both the first rib portion 25a and the second rib portion 25b, and a combination of ribs including either one may be used. 16, 17, and 18 show the same location on the upper part of the main body 11 as viewed from the same direction. Fig. 16 shows an enlarged view of a part of the flow path part 70 to which the mouthpiece 30 is attached. Fig. 17 shows an enlarged view of a part of the flow path part 70 from the state shown in Fig. 16 with the mouthpiece 30 removed. Fig. 18 shows an enlarged view of a part of the flow path part 70 from the state shown in Fig. 17 with the deflector 20 removed. 17 and 18, the deflector 20 has a larger outer shape than the blowing port 18 when viewed in the direction in which the blowing port 18 extends. Therefore, it becomes difficult to blow exhaled air into the blowing port 18 from the front of the blowing port 18 using a cylindrical body such as a straw 400 to cause the pressure sensor 15 to detect a predetermined pressure. Here, a case in which the deflector 20 has a larger outer shape than the blowing port 18 when viewed in the direction in which the blowing port 18 extends is taken as an example, but the deflector 20 may be the same size as the blowing port 18. When the deflector 20 is said to be the same size as the blowing port 18, this also includes a case in which the deflector 20 and the blowing port 18 are the same in terms of design but do not completely match due to manufacturing errors. A convex portion 72 having an outer periphery basically based on a square is provided around the mouth inlet 18. This convex portion 72 fits into the inner periphery of the outlet 33 of the mouthpiece 30. The outer periphery of this convex portion 72 fits tightly against the inner surface of the mouthpiece 30. This tight fit between the convex portion 72 and the mouthpiece 30 prevents exhaled air from leaking to the outside from the mouthpiece 30.

[0018] (2) Detection Operation of Gas Detector 10 In the gas detector 10, when the switch 42 is turned on, the microcomputer 40 performs a countdown, and when the countdown ends, the microcomputer 40 informs the subject 300 that the device is ready for detection, for example, by sound or light. The subject 300 blows breath into the breath flow path 12 through the mouthpiece 30 (see FIG. 4). At this time, in the gas detector 10, the pressure of the air around the pressure sensor 15 increases through the collection flow path 13 that is in communication with the breath flow path 12. When the pressure sensor 15 detects that the pressure of the air around the pressure sensor 15 exceeds a predetermined pressure, the microcomputer 40 determines that the blowing of breath into the breath flow path 12 has started and is continuing thereafter. When a predetermined time has elapsed since the start of blowing into the breath flow path 12, the microcomputer 40 drives the air pump 14 to draw breath from the breath flow path 12 into the chamber CH. Next, the microcomputer 40 causes the gas sensor 16 to detect the concentration of a specific gas at the appropriate air pressure.

[0019] (3) Example of a management method using a gas detector 19 shows an example of a management method using the gas detector 10. First, when the switch 42 of the gas detector 10 is turned on, the gas detector 10 is started (step ST1). When the switch 42 is turned on, the microcomputer 40 starts detection (step ST2). At this time, the application of the certification device 60 is started (step ST20). In the gas detector 10, the microcomputer 40 commands the transmitting / receiving device 47 to establish a wireless connection with the certification device 60 (step ST3). The certification device 60 establishes a wireless connection with the gas detector 10 (step ST21). To this end, the transmitting / receiving device 47 of the gas detector 10 and the certification device 60 transmit and receive signals to and from each other. The microcomputer 40 of the gas detector 10 performs a countdown after a wireless connection is established with the certification device 60. The microcomputer 40 commands the transmitting / receiving device 47 to transmit a countdown signal indicating that the countdown is being performed (step ST4). The certification device 60 receives the countdown signal via the communication unit 62 (step ST22). In the gas detector 10, when a preset countdown ends, the microcomputer 40 notifies the subject 300 that the countdown has ended (that detection preparation is complete). The subject 300, who has recognized that detection preparation is complete, blows breath into the breath flow path 12 through the dedicated mouthpiece 30. As the subject 300 continues to blow breath into the breath flow path 12 using the dedicated mouthpiece 30, the microcomputer 40 in the gas detector 10 detects the continuation of the breath blowing by the pressure sensor 15 (step ST5). The microcomputer 40, having detected the continuation of the breath blowing, commands the transmitting / receiving device 47 to transmit a breath blowing signal. The certificate device 60 receives the breath blowing signal transmitted by the transmitting / receiving device 47 through the communication unit 62 (step ST23).

[0020] In the gas detector 10, the gas sensor 16 detects the breath blown in, and the microcomputer 40 calculates the gas concentration (step ST6). When the detection of the gas concentration is completed, the microcomputer 40 displays the calculated detection result on the display device 43, and commands the light-emitting device to emit light in a color corresponding to the gas concentration, for example (step ST7). If the gas detector 10 is a breathalyzer, the microcomputer 40 causes the light device to emit light in blue when the person is allowed to perform the work, and in red when the person is not allowed to perform the work. The microcomputer 40 notifies the subject 300 that the detection result has been calculated, for example by using sound or light, in accordance with the timing of the display. The microcomputer 40 also commands the transmitting / receiving device 47 to transmit a trigger signal that provides the timing of photographing together with the data of the detection result. The certification device 60 receives the data of the detection result and the trigger signal by the communication unit 62 (step ST24). Upon receiving the trigger signal, the certification device 60 executes photographing or video shooting by the imaging device 61 (step ST24). When taking a photograph or video, the subject 300 faces the display screen 43a of the gas detector 10 and the front of his / her face towards the illumination device 60, as shown in Fig. 1. When taking a photograph or video with the display screen 43a of the gas detector 10 and the front of his / her face facing the illumination device 60 as shown in Fig. 1, the display screen 43a of the gas detector 10 and the front of the face of the subject 300 are captured in the image. The microcomputer 40 transmits data indicating the date and time of breath detection and the detection result of the gas sensor 16 to the external computer 50, and ends the measurement of the gas concentration (step ST8). In the gas detector 10, the switch 42 is turned off (step ST9). The illumination device 60 transmits the detection result data and the photo or video data from the communication unit 62 to the external computer 50 (step ST25). The external computer 50, which is a management device, stores the data sent from the gas detector 10 and the illumination device 60 in association with each other.

[0021] <Second embodiment> (4) Overview of gas detectors In the first embodiment, the mouthpiece 30 is made of, for example, resin. In the gas detector 10 of the second embodiment, the mouthpiece 30A shown in Fig. 20 is made of a conductive metal, an electrode 80 is embedded in the flow path part 70, and the mouthpiece 30A is configured to detect a change in capacitance caused by a person holding the mouthpiece in his / her mouth. The gas detector 10 of the second embodiment detects that the subject 300 is correctly attached and holds the mouthpiece 30A in his / her mouth. By detecting that the subject 300 holds the mouthpiece 30A in his / her mouth, the gas detector 10 of the second embodiment makes it difficult for the subject 300 to introduce exhaled air from anywhere other than the mouthpiece 30A. Except for the above-mentioned differences, the gas detector 10 of the second embodiment and the management method using the same can be configured in the same way as the gas detector 10 of the first embodiment and the management method using the same.

[0022] (5) Variations (5-1) Variation A In the above first and second embodiments, the deflector 20 has a shape having a rectangular parallelepiped space in the center of a cylinder and a groove on the outer periphery into which the second rib portion 25b fits. However, the shape of the deflector 20 is not limited to this shape. The deflector 20 may have, for example, a shape based on a plate, a shape based on a prism, or a shape based on a cone. (5-2) Variation B In the above first and second embodiments, the inlet 32 ​​of the mouthpiece 30 is described as having an elliptical shape, and the outlet 33 is basically a square shape (a square shape with rounded corners). However, the shapes of the inlet 32 ​​and the outlet 33 of the mouthpiece 30 are not limited to such shapes. For example, the inlet 32 ​​and the outlet 33 of the mouthpiece 30 may be circular or polygonal. (5-3) Variation C In the above first and second embodiments, the mouthpiece 30 has an outer shape that makes it easy to distinguish it from the cylindrical straw 400. However, the method of making the mouthpiece 30 easy to distinguish it from other cylindrical bodies (e.g., the straw 400) is not limited to making the outer shape different. For example, the method of making the distinction easy may be a method of putting a number, a symbol, or a pattern on the part of the mouthpiece 30 that is photographed. (5-4) Variation D In the above first and second embodiments, a case has been described in which the microcomputer 40 is configured to detect a predetermined gas by the gas sensor 16 when the pressure sensor 15 continues to detect a pressure equal to or greater than the predetermined pressure. However, the gas detector 10 may be configured to perform detection by the gas sensor 16 even if the gas sensor 16 does not continue to detect a pressure equal to or greater than the predetermined pressure as long as the gas detector 10 temporarily detects a pressure equal to or greater than the predetermined pressure.

[0023] (6) Features (6-1) As described in the first and second embodiments, the gas detector 10 includes an exhalation flow path 12, a sampling flow path 13, a deflector 20, a mouthpiece 30, a pressure sensor 15, a gas sensor 16, and a microcomputer as a controller. The exhalation flow path 12 has an inlet 18 and an outlet 19. The exhalation flow path 12 is a flow path through which the exhalation flows from the inlet to the outlet by the pressure of the exhalation blown in by the subject. The collection flow path 13 is a flow path branched from the exhalation flow path 12 and takes in the exhalation from the exhalation flow path 12. The deflector 20 is a member disposed in front of the inlet 18 and deflects the airflow toward the inlet 18. The mouthpiece 30 has a specific shape that is detachable from the exhalation flow path 12. The mouthpiece 30 also has an inlet flow path 31 that positions the deflector 20 inside when the mouthpiece 30 is attached to the body 11 of the gas detector 10. The mouthpiece 30 has a structure that sends the exhalation to the inlet 18 by bypassing the deflector 20 by the inlet flow path 31. In gas detector 10, pressure sensor 15 is disposed in sampling flow path 13 and is a sensor that detects the air pressure in sampling flow path 13. Gas sensor 16 is disposed in sampling flow path 13 and is a sensor that detects the concentration of a predetermined gas in the exhaled breath taken into sampling flow path 13. The microcomputer 40 as a controller is connected to the pressure sensor 15 and the gas sensor 16. When breath is blown into the breath flow path 12 through the mouthpiece 30, the pressure sensor 15 detects a pressure equal to or greater than a predetermined pressure, and the microcomputer 40 (controller) enters a state in which the gas sensor 16 can perform detection. On the other hand, the gas detector 10 is configured such that, when breath is blown into the breath inlet 18 in a state in which a gap through which breath leaks is generated between the breath inlet 18 and the deflector 20, the pressure sensor 15 does not detect a pressure equal to or greater than the predetermined pressure, and the microcomputer 40 (controller) maintains a state in which the gas sensor 16 cannot perform detection. In this way, in the gas detector 10, if one tries to blow breath into the mouthpiece 18 using a tube such as a straw 400 (see FIG. 14) other than the mouthpiece 30 having a specific shape, the mouthpiece 30 will be removed, and a gap through which the breath will leak will be created between the mouthpiece 18 and the deflector 20, and the breath will be blown into the mouthpiece 18 in this state. As a result, the pressure sensor 15 will not detect a pressure equal to or greater than the predetermined pressure, and the microcomputer 40 (controller) will not be able to perform detection using the gas sensor 16, making it difficult for the subject 300 (see FIG. 1) to have the predetermined gas detected in the breath by someone other than the subject 300 without using the mouthpiece 30. Although the microcomputer 40 is shown here as an example of the controller, the controller is not limited to a microcomputer. The controller may be, for example, a semiconductor integrated circuit having a control function, or an electronic board having a control function.

[0024] (6-2) As described in the first and second embodiments, in the gas detector 10, the exhalation flow path 12 has a rib 25 (particularly, a first rib portion 25a) on the inner wall of the exhalation flow path 12, which extends from the blowing port 18 toward the downstream of the exhalation flow path 12. In such a gas detector 10, the rib 25 prevents a cylinder such as a straw 400 (see FIG. 14) from being inserted into the exhalation flow path 12, so that a gap through which exhaled air leaks is likely to be generated between the blowing port 18 and the deflector 20. As a result, the pressure sensor 15 does not detect a pressure equal to or higher than a predetermined pressure, and the microcomputer 40 (controller) is likely to be unable to perform detection by the gas sensor 16, which makes it even more difficult for someone other than the subject 300 (see FIG. 1) to receive gas detection in place of the subject 300 without using the mouthpiece 30. (6-3) As described in the first and second embodiments, the gas detector 10 includes the rib 25 (particularly the second rib portion 25b) which is a support protrusion that extends to the deflector 20 and supports the deflector 20. The mouthpiece 30 has a slit 34 into which the second rib portion 25b (support protrusion) fits. In this gas detector 10, the periphery of the slit 34 of the mouthpiece 30 can be supported by the second rib portion 25b (support protrusion). As a result, a gap is unlikely to be formed between the mouthpiece 30 and the blowing port 18, and the pressure sensor 15 detects a pressure equal to or higher than a predetermined pressure, and the microcomputer 40 (controller) can perform detection by the gas sensor 16 by simply attaching the mouthpiece 30. Although the second rib portion 25b is shown as an example of the support protrusion, the support protrusion may be something other than the rib 25. The support protrusion may be, for example, a rod-shaped member protruding from the flow path component . (6-4) As described in the first and second embodiments, in the gas detector 10, the deflector 20 has an outer shape equal to or larger than that of the blow inlet 18 when viewed in the direction in which the breath flow path 12 extends from the blow inlet 18. In such a gas detector 10, the deflector 20 prevents a cylinder such as a straw 400 (see FIG. 14) from being inserted into the breath flow path in the direction in which the breath flow path 12 extends from the blow inlet 18 (see FIG. 17), so that a gap through which the breath leaks is likely to be generated between the blow inlet 18 and the deflector 20. As a result, the pressure sensor 15 does not detect a pressure equal to or higher than the predetermined pressure, and the microcomputer 40 (controller) is likely to be unable to perform detection by the gas sensor 16, and it becomes even more difficult for someone other than the subject 300 to receive gas detection in place of the subject 300 without using the mouthpiece 30. Although the first and second embodiments of the present invention have been described above, the present invention is not limited to the above-mentioned embodiments, and various modifications are possible without departing from the gist of the invention. In particular, the multiple embodiments and modifications described in this specification can be arbitrarily combined as necessary. [Explanation of symbols]

[0025] 10 Gas detector 12 Expiratory flow path 13 Collection channel 15 Pressure Sensor 16 Gas Sensor 18 Air inlet 19 Exhaust port 20 Deflector 25 Ribs 25a First rib section 25b Second rib part (example of support protrusion) 30,30A Mouthpiece 31 Blowing channel 34 Slit 40 Microcomputer (Example of a controller) 43 Display device 43a Display screen 50 External Computers (Examples of Management Devices) 60 Identification Device 61 Imaging Device 62 Communications Department

Claims

1. an exhalation flow path having an inlet and an exhaust port, the exhalation flowing from the inlet to the exhaust port by the pressure of the exhalation blown by the subject; A collection flow path that branches off from the exhalation flow path and takes in exhaled air from the exhalation flow path; A deflector disposed in front of the air inlet to deflect an airflow toward the air inlet; A mouthpiece having a specific shape that is detachable from the exhalation flow path, and a blow-in flow path that positions the deflector inside when the mouthpiece is attached, and a structure in which the blow-in flow path bypasses the deflector and sends exhaled air to the blow-in port; a pressure sensor disposed in the collection flow path and detecting an air pressure in the collection flow path; a gas sensor disposed in the collection flow path and configured to detect a concentration of a predetermined gas in the exhaled breath taken into the collection flow path; a controller connected to the pressure sensor and the gas sensor; Equipped with By blowing exhaled air into the exhalation flow path through the mouthpiece, the pressure sensor detects a pressure equal to or greater than a predetermined pressure, and the controller is ready to perform detection using the gas sensor. This gas detector is configured so that when the mouthpiece is removed to create a gap between the mouthpiece and the deflector through which exhaled air leaks, and exhaled air is blown into the mouthpiece, the pressure sensor does not detect a pressure equal to or greater than the predetermined pressure, and the controller maintains a state in which the gas sensor cannot perform detection.

2. The exhalation flow path has a rib extending from the blowing port toward a downstream of the exhalation flow path on an inner wall of the exhalation flow path.

2. The gas detector of claim 1.

3. a support protrusion extending to the deflector and supporting the deflector; The mouthpiece has a slit into which the support protrusion fits.

2. The gas detector of claim 1.

4. The deflector has an outer shape that is the same as or larger than the blowing port when viewed in a direction in which the exhalation flow path extends from the blowing port.

2. The gas detector of claim 1.

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