TW202212789A - Infrared sensing module and forehead thermometer - Google Patents

Abstract

An infrared sensing module and a forehead thermometer are provided. The infrared sensing module includes a light guiding structure and an infrared sensing element. An annular hollow area is formed inside the light guiding structure, and the annular hollow area penetrates the light guiding structure, and a first hole and a second hole are respectively opened on opposite sides of the light guiding structure. The aperture of the first hole is larger than the aperture of the second hole. The annular hollow area includes a light extinction area and a reflection area. The light extinction area has multiple serrations. Every serration extends from the first hole to the second hole. Multiple serrations are arranged parallel to each other. The reflection area is formed between the second hole and the extinction area. The infrared sensing element is arranged in the second hole. The forehead thermometer includes a housing, a circuit board, an infrared sensing module, and an operation switch. The infrared sensing module is arranged inside the housing.

Description

Infrared sensing module and forehead temperature measurement device

The invention relates to an infrared sensing module and a forehead temperature measuring device, in particular to an infrared sensing module and a forehead temperature measuring device with a light guide structure.

First of all, in the prior art, when using an infrared forehead thermometer to measure human body temperature, it is usually necessary to place the forehead thermometer 1 to 3 cm (or even closer) to the center of the forehead to avoid measuring infrared energy outside the center of the forehead to be accurate The body temperature is measured because the infrared sensing element used in the infrared forehead thermometer generally measures a viewing angle greater than 120 degrees. Therefore, when the infrared forehead thermometer is too far away from the human body, in addition to the infrared rays emitted from the center of the forehead of the human body will enter the forehead thermometer, the lower or higher infrared energy outside the center of the forehead may also enter the forehead thermometer and It is received by the infrared sensing element, causing the temperature value measured by the forehead thermometer to be distorted.

In addition, when the distance between the infrared forehead thermometer and the forehead of the human body is too far, even if the infrared rays emitted from the center of the forehead of the human body enter the interior of the forehead thermometer, some of the energy may be dissipated due to the long distance, resulting in the final infrared sensing element receiving The infrared signal and the converted signal are too weak to be clearly distinguished from the noise, which also distorts the temperature value measured by the forehead thermometer.

Therefore, through the improvement of the optical structure design, how to make the viewing angle of the forehead thermometer smaller and longer, and filter out unnecessary external light, at the same time, it can focus and amplify or at least maintain the energy of the infrared rays received by the infrared sensing element. , to overcome the above-mentioned defects, has become one of the important issues to be solved in this field.

The technical problem to be solved by the present invention is to provide an infrared sensing module, which includes a light guide structure and an infrared sensing element, in view of the deficiencies of the prior art. An annular hollow area is formed inside the light guide structure, the annular hollow area penetrates through the light guide structure, and a first opening and a second opening are respectively opened on opposite sides of the light guide structure. The diameter of the first opening is larger than the diameter of the second opening. The annular hollow area includes an extinction area and a reflection area. The matting region has a plurality of saw teeth. Each sawtooth portion extends from the first opening to the second opening. The reflection area is formed between the second opening and the extinction area. The infrared sensing element is disposed in the second opening.

In order to solve the above technical problems, one of the technical solutions adopted by the present invention is to provide a forehead temperature measurement device, which includes a casing, a circuit board, an infrared sensing module and an operation switch. The housing has an opening. The circuit board is arranged inside the casing. The infrared sensing module is arranged inside the casing, the infrared sensing module is electrically connected to the circuit board, and the first opening of the infrared sensing module is arranged at the opening. The operation switch is arranged on the casing, the operation switch is electrically connected to the circuit board, and the operation switch is electrically connected to the infrared sensing module through the circuit board. The infrared sensing module includes a light guide structure and an infrared sensing element. An annular hollow area is formed inside the light guide structure, the annular hollow area penetrates through the light guide structure, and a first opening and a second opening are respectively opened on opposite sides of the light guide structure. The diameter of the first opening is larger than the diameter of the second opening. The annular hollow area includes an extinction area and a reflection area. The matting region has a plurality of saw teeth. Each sawtooth portion extends from the first opening to the second opening. The reflection area is formed between the second opening and the extinction area. The infrared sensing element is disposed in the second opening.

One of the beneficial effects of the present invention is that the infrared sensing module and the forehead temperature measuring device provided by the present invention can pass through "the infrared sensing module includes a light guide structure and an infrared sensing element", "a light guide structure" An annular hollow area is formed inside, the annular hollow area penetrates the light guide structure, and a first opening and a second opening are respectively opened on opposite sides of the light guide structure", "The diameter of the first opening is larger than that of the second opening. Aperture”, “The annular hollow area includes an extinction area and a reflection area”, “The extinction area has a plurality of sawtooth parts, and each sawtooth part extends from the first opening to the second opening and is arranged in parallel with each other”, “The reflection area is formed by Between the second opening and the extinction area”, “The infrared sensing element is arranged in the second opening”, “The forehead temperature measurement device includes a casing, a circuit board, an infrared sensing module and an operation switch”, “The casing The body has an opening, and the first opening of the infrared sensing module is arranged in the opening”, “The circuit board and the infrared sensing module are arranged inside the casing” and “The operation switch is arranged in the casing, and the operation switch is electrically connected to the circuit board. , and the operation switch is electrically connected to the infrared sensing module through the circuit board” technical scheme, which can filter out unnecessary external light at a longer measurement distance, and at the same time amplify or at least maintain the received infrared sensing element. The energy of infrared rays improves the accuracy of the measured body temperature.

For a further understanding of the features and technical content of the present invention, please refer to the following detailed descriptions and drawings of the present invention. However, the drawings provided are only for reference and description, and are not intended to limit the present invention.

The following is a description of the implementation of the “infrared sensing module and the forehead temperature measurement device” disclosed in the present invention through specific specific examples. Those skilled in the art can understand the advantages and effects of the present invention from the content disclosed in this specification. . The present invention can be implemented or applied through other different specific embodiments, and various details in this specification can also be modified and changed based on different viewpoints and applications without departing from the concept of the present invention. In addition, the drawings of the present invention are merely schematic illustrations, and are not drawn according to the actual size, and are stated in advance. The following embodiments will further describe the related technical contents of the present invention in detail, but the disclosed contents are not intended to limit the protection scope of the present invention. Additionally, it should be understood that, although the terms "first," "second," "third," etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are primarily used to distinguish one element from another. In addition, the term "or", as used herein, should include any one or a combination of more of the associated listed items, as the case may be. In addition, the term "or", as used herein, should include any one or a combination of more of the associated listed items, as the case may be.

[First Embodiment]

Referring to FIGS. 1 to 4 , a first embodiment of the present invention provides an infrared sensing module, which includes a light guide structure 1 and an infrared sensing element 2 . An annular hollow area 10 is formed inside the light guide structure 1 . The annular hollow region 10 penetrates through the light guide structure 1 , and respectively defines a first opening 101 and a second opening 102 on opposite sides of the light guide structure 1 . It should be noted that the diameter of the first opening 101 is larger than the diameter of the second opening 102 .

Next, the light guide structure 1 will be specifically described. Referring to FIG. 1 and FIG. 4 , the annular hollow area 10 includes a light extinction area 103 and a reflection area 104 . The length L1 of the extinction area 103 is 1 to 3 times the length L2 of the reflection area 104 , and the inner diameter of the extinction area 103 is greater than or equal to the inner diameter of the reflection area 104 . The extinction region 103 has a plurality of sawtooth portions 105 , more specifically, the extinction region 103 has a plurality of sawtooth portions 105 connected with peaks and valleys. Each sawtooth portion 105 extends from the first opening 101 to the second opening 102 . More specifically, the tooth tips of each serration portion 105 extend from the first opening 101 to the second opening 102 , that is, along the axial direction of the annular hollow region 10 . The surface of the serrated portion 105 is rough, and the surface of the serrated portion 105 can be coated with a layer of black matte paint. The reflection area 104 is formed between the second opening 102 and the extinction area 103 . The surface of the reflection area 104 is a parabolic mirror, and the surface of the reflection area 104 is coated with a layer of metal with high infrared reflectivity such as nickel or gold, so that the surface of the reflection area 104 can reflect and focus infrared rays more.

The infrared sensing element 2 can be disposed in the second opening 102 . The infrared sensing element 2 can receive the infrared rays emitted from the center of the forehead of the human body, and then convert it into a signal that can be displayed in temperature units. Therefore, when the infrared ray emitted from the center of the human forehead enters the infrared sensing module M through the first opening 101 , it will pass through the extinction area 103 and the reflection area 104 in sequence, and is finally received by the infrared sensing element 2 .

However, since the infrared sensing module does not directly contact the forehead of the human body, it is inevitable that light B (including infrared rays) outside the center of the forehead will also enter the infrared sensing module through the first opening 101 . In detail, since the infrared sensing module is aimed at the center of the forehead of the human body for measurement, therefore, for two different light sources, the infrared light emitted from the center of the forehead of the human body and the light B outside the center of the forehead, the infrared light emitted from the center of the forehead of the human body. The angle of entering the infrared sensing module from the first opening 101 is relatively small, while the angle of the light B outside the center of the forehead entering the infrared sensing module from the first opening 101 is relatively large, as shown in FIG. 1 .

Continuing to refer to FIG. 1 , the infrared rays (not shown) emitted from the center of the forehead of the human body enter the annular hollow area 10 in the light guide structure 1 . Since the incident angle of the infrared rays emitted from the center of the forehead of the human body is small, it does not touch the extinction area 103, but touches the reflective area 104, and is focused by the surface reflection (single reflection or multiple reflections) of the reflective area 104. to the infrared sensing element 2. As mentioned above, since the reflection area 104 is a smooth mirror surface or a smooth surface plated with bright nickel, the infrared rays emitted from the center of the human forehead will not lose energy when reflected on the surface of the reflection area 104 . Therefore, the infrared sensing element 2 can receive the infrared rays emitted from the center of the forehead of a complete human body and convert it into a signal with sufficient strength, and will not be covered by noise because the signal is too weak.

On the other hand, the light rays B outside the center of the forehead enter the annular hollow area 10 in the light guide structure 1 at a large angle, so they will first contact the serrations 105 of the extinction area 103 . As mentioned above, since the structure of the sawtooth portion 105 itself extends along the axis of the annular hollow area 10, and the surface of the sawtooth portion 105 is rough or coated with a layer of black matte paint, the external light B contacts the sawtooth. The serrations 105 are continuously reflected between the surfaces of the plurality of sawtooth portions 105 . The energy of the external light B continuously reflected between the surfaces of the plurality of sawtooth portions 105 will be continuously lost and dissipated, and will not be received by the infrared sensing element 2 . Further, since the length L1 of the extinction area 103 is 1 to 3 times the length L2 of the reflection area 104, it can be ensured that the reflection path length of the light B outside the center of the forehead in the extinction area 103 is long enough, and the light B outside the center of the forehead can be greatly affected. probability of loss.

In this embodiment, the inner diameter of the extinction area 103 is gradually narrowed inward from the first opening 101 (towards the reflection area 104 ). In other words, the tooth tip lines of the plurality of serrations 105 form a conical structure. In addition, in this embodiment, the surface contour of the reflection area 104 is a paraboloid and the infrared sensing element is located at the focus of the paraboloid, so that the infrared rays emitted by the human body can be further concentrated by the surface reflection of the reflection area 104 and received by the infrared sensing element 2 , which further enhances the signal strength of the converted temperature signal. In other words, compared with the prior art, the light guide structure 1 provided by the present invention can reduce the infrared energy outside the center of the forehead and focus to increase the efficacy of the infrared energy in the center of the forehead at a longer measurement distance.

[Second Embodiment]

Referring to FIGS. 5 to 7 , FIGS. 5 to 7 are another embodiment of the light guide structure of the present invention. The surface characteristics of the extinction area 103 and the reflection area 104 and the uses of the extinction area 103 and the reflection area 104 in this embodiment are the same as those in the first embodiment, and will not be repeated here. The biggest difference between this embodiment and the first embodiment is that the tooth tip lines of the plurality of serrations 105 form a cylindrical structure, and the surface contour of the reflection area 104 is an isosceles trapezoid line.

In addition, in the present embodiment, the light guide structure 1 includes a first light guide structure 11 and a second light guide structure 12 that are joined to each other, the extinction area 103 is arranged inside the first light guide structure 11 , and the first opening is opened in the In the first light guide structure 11 , the reflection area is disposed inside the second light guide structure 12 , and the second opening is opened in the second light guide structure 12 . The first light guide structure 11 includes a third opening 111 , the second light guide structure 12 includes a fourth opening 121 , and the first light guide structure 11 passes through the third opening 111 and the fourth opening of the second light guide structure 12 . 121 are engaged, and the diameter of the third opening 111 is greater than or equal to the diameter of the fourth opening 121 .

In other words, the light guide structure 1 in the first embodiment is an integrally formed element, while in the second embodiment, the light guide structure 1 is a composite element that is mutually joined by the first light guide structure 11 and the second light guide structure 12 .

It is worth mentioning that although the surface contour of the reflection area 104 in the first embodiment is a paraboloid, and the surface contour of the reflection area 104 in the second embodiment is an isosceles trapezoid, the present invention is not limited thereto. In other embodiments, the surface profile of the reflection region 104 can also be an elliptical surface.

1, 8 to 10, the present invention provides a forehead temperature measuring device Z, which includes: a casing 3, a circuit board 4, an operation switch 5, a display panel 6 and the infrared sensing module of the present invention M. The infrared sensing module M is arranged inside the casing 3 . The infrared sensing module M is electrically connected to the circuit board 4 . The infrared sensing module M includes a light guide structure 1 and an infrared sensing element 2 .

The infrared sensing element 2 is electrically connected to the circuit board 4 . The light guide structure 1 has a connecting piece 13 , and the connecting piece 13 is arranged on the outer surface of the light guide structure 1 . The light guide structure 1 of the present invention is first connected to the fixing member 14 through the connecting member 13 , and then fixed to the circuit board 4 through the fixing member 14 . It should be noted that the type of the connecting member 13 and the connection manner thereof can also have other implementation forms, and the above-mentioned example is only one of the possible embodiments and is not intended to limit the present invention.

An annular hollow area 10 is formed inside the light guide structure 1 , the annular hollow area 10 penetrates through the light guide structure 1 , and respectively defines a first opening 101 and a second opening 102 on opposite sides of the light guide structure 1 . The diameter of the first opening 101 is larger than the diameter of the second opening 102 . The annular hollow area 10 includes an extinction area 103 and a reflection area 104 . The extinction region 103 has a plurality of sawtooth portions 105 , more specifically, the extinction region 103 has a plurality of sawtooth portions 105 connected with peaks and valleys. Each sawtooth portion 105 extends from the first opening 101 to the second opening 102 . The reflection area 104 is formed between the second opening 102 and the extinction area 103 , and the infrared sensing element 2 is disposed in the second opening 102 .

When the infrared sensing module M is disposed inside the casing 3 , the first opening 101 is disposed in the opening 30 . In other words, the first opening 10 and the opening 30 are arranged overlappingly, so that the infrared rays emitted from the center of the forehead of the human body or the light B outside the center of the forehead can enter the interior of the infrared sensing module M through the opening 30 (or the first opening 10 ). Received by the infrared sensing element 2 .

The operation switch 5 is disposed on the casing 3 , and the operation switch 5 is electrically connected to the circuit board 4 . The operation switch 5 is electrically connected to the infrared sensing module M through the circuit board 4 . The display panel 6 is disposed on the casing 3 , and the display panel 6 is electrically connected to the circuit board 4 . The user activates and controls the infrared sensing module M to measure the infrared temperature through the operation switch 5 , and the measured temperature value is displayed on the display panel 6 for the user to check.

[Advantageous effects of the embodiment]

One of the beneficial effects of the present invention is that the infrared sensing module M and the forehead temperature measuring device Z provided by the present invention can pass through "the infrared sensing module M includes a light guide structure 1 and an infrared sensing element 2" , "An annular hollow area 10 is formed inside the light guide structure 1, the annular hollow area 10 penetrates the light guide structure 1, and a first opening 101 and a second opening 102 are respectively opened on opposite sides of the light guide structure 1", " The aperture of the first opening 101 is larger than the aperture of the second opening 102 ”, “The annular hollow area 10 includes the extinction area 103 and the reflection area 104”, “The extinction area 103 has a plurality of sawtooth portions 105, and each sawtooth portion 105 is formed by the An opening 101 extends to the second opening 102 and is arranged in parallel with each other", "The reflective area 104 is formed between the second opening 102 and the extinction area 103", "The infrared sensing element 2 is arranged in the second opening 102" ”, “The forehead temperature measuring device Z includes a casing 3, a circuit board 4, an infrared sensing module M and an operation switch 5”, “The casing 3 has an opening 30, and the first opening 101 of the infrared sensing module M is arranged in the opening 30 ”, “the circuit board 4 and the infrared sensing module M are arranged inside the casing 3” and “the operation switch 5 is arranged in the casing 3, the operation switch 5 is electrically connected to the circuit board 4, and the operation switch 5 passes through the The circuit board 4 is electrically connected to the infrared sensing module M" to filter out unnecessary external light, and at the same time amplify or at least maintain the infrared energy received by the infrared sensing element, so as to improve the measured human body temperature accuracy.

Furthermore, since the external light B enters the infrared sensing module M of the present invention at a large angle, the infrared rays emitted from the center of the human forehead enter the infrared sensing module M of the present invention at a relatively small angle. Therefore, the present invention utilizes the extinction region 103 in the light guide structure 1 to filter out the external light B with a large angle, thereby improving the accuracy of the measured temperature. In addition, the present invention utilizes the reflection area 104 in the light guide structure 1 to reflect the infrared rays emitted from the center of the forehead of the human body to amplify or at least maintain the energy of the infrared rays emitted from the center of the forehead of the human body, so that the infrared rays emitted from the center of the forehead of the human body are When the infrared rays are received by the infrared sensing element 2, too much energy will not be dissipated, causing the converted temperature signal to be too weak. In other words, compared with the prior art, the light guide structure 1 provided by the present invention can reduce the infrared energy outside the center of the forehead and focus to increase the efficacy of the infrared energy in the center of the forehead at a longer measurement distance.

The contents disclosed above are only preferred feasible embodiments of the present invention, and are not intended to limit the scope of the present invention. Therefore, any equivalent technical changes made by using the contents of the description and drawings of the present invention are included in the application of the present invention. within the scope of the patent.

Z: Forehead temperature measuring device M: Infrared sensor module 1: Light guide structure 10: Annular hollow area 101: The first opening 102: Second opening 103: Extinction area 104: Reflection area 1041: Paraboloid 1042: Isosceles Trapezoid Line 105: Sawtooth 11: The first light guide structure 111: The third opening 12: Second light guide structure 121: Fourth opening 13: Connectors 14: Fixing parts 2: Infrared sensing element 3: Shell 30: Opening 31: Handle 4: circuit board 5: Operation switch 6: Display panel L1: The length of the extinction area L2: The length of the reflection area B: Light beyond the center of the forehead

FIG. 1 is a schematic three-dimensional cross-sectional view of an infrared sensing module according to a first embodiment of the present invention.

FIG. 2 is a three-dimensional schematic diagram of a light guide structure of an infrared sensing module according to a first embodiment of the present invention.

FIG. 3 is another perspective view of the light guide structure of the infrared sensing module according to the first embodiment of the present invention.

4 is a schematic cross-sectional view of the light guide structure of the infrared sensing module according to the first embodiment of the present invention.

5 is a schematic perspective view of a light guide structure of an infrared sensing module according to a second embodiment of the present invention.

6 is another perspective view of the light guide structure of the infrared sensing module according to the second embodiment of the present invention.

7 is a schematic cross-sectional view of a light guide structure of an infrared sensing module according to a second embodiment of the present invention.

FIG. 8 is a schematic perspective view of the forehead temperature measuring device of the present invention.

FIG. 9 is another three-dimensional schematic diagram of the forehead temperature measuring device of the present invention.

10 is a schematic three-dimensional cross-sectional view of the forehead temperature measurement device of the present invention.

B: Light beyond the center of the forehead

1: Light guide structure

10: Annular hollow area

101: The first opening

102: Second opening

103: Extinction area

104: Reflection area

105: Sawtooth

13: Connectors

2: Infrared sensing element

Claims (16)

An infrared sensing module, comprising: a light guide structure, an annular hollow area is formed inside the light guide structure, the annular hollow area penetrates the light guide structure, and a first opening and a The second opening, the diameter of the first opening is larger than the diameter of the second opening, the annular hollow area includes a light extinction area and a reflection area, the light extinction area has a plurality of sawtooth parts, each of the The sawtooth portion extends from the first opening to the second opening, and the reflective area is formed between the second opening and the extinction area; and An infrared sensing element is disposed in the second opening. The infrared sensing module according to claim 1, wherein the length of the extinction area is 1 to 3 times the length of the reflection area, and the inner diameter of the extinction area is greater than or equal to the reflection area the inner diameter. The infrared sensing module according to claim 1, wherein the surface of each of the serrations is a rough surface. The infrared sensing module according to claim 1, wherein the surface of each of the saw teeth is coated with a layer of black matte paint. The infrared sensing module according to claim 1, wherein the surface of the reflection area is a parabolic mirror surface. The infrared sensing module according to claim 1, wherein the surface of the reflection area is plated with a layer of nickel. The infrared sensing module according to claim 1, wherein the surface profile of the reflection area is a paraboloid, an isosceles trapezoid or an elliptical surface. The infrared sensing module of claim 1, wherein the light guide structure comprises a first light guide structure and a second light guide structure that are joined to each other, and the light extinction area is disposed on the first light guide Inside the structure, the first opening is opened in the first light guide structure, the reflection area is arranged inside the second light guide structure, and the second opening is opened in the second light guide structure structure. The infrared sensing module of claim 8, wherein the first light guide structure includes a third opening, the second light guide structure includes a fourth opening, and the first light guide structure The third opening is connected to the fourth opening of the second light guide structure, and the diameter of the third opening is greater than or equal to the diameter of the fourth opening. A forehead temperature measurement device, comprising: a shell having an opening; a circuit board, arranged inside the casing; An infrared sensing module is disposed inside the casing, and the infrared sensing module is electrically connected to the circuit board, the infrared sensing module includes a light guide structure and an infrared sensing element, An annular hollow area is formed inside the light guide structure, the annular hollow area penetrates the light guide structure, and a first opening and a second opening are respectively opened on opposite sides of the light guide structure, The aperture of the first opening is larger than the aperture of the second opening, the annular hollow area includes an extinction area and a reflection area, the extinction area has a plurality of sawtooth portions, and each of the sawtooth portions is formed by the The first opening extends toward the second opening, the reflection area is formed between the second opening and the extinction area, the infrared sensing element is disposed in the second opening, and Wherein, the first opening is arranged in the opening; an operation switch, disposed on the casing, the operation switch is electrically connected to the circuit board, and the operation switch is electrically connected to the infrared sensing module through the circuit board; and A display panel is disposed on the casing, and the display panel is electrically connected to the circuit board. The forehead temperature measurement device according to claim 10, wherein the length of the extinction area is 1 to 3 times the length of the reflection area, and the inner diameter of the extinction area is greater than or equal to the reflection area the inner diameter. The forehead temperature measurement device according to claim 10, wherein the surface of each of the saw tooth portions is a rough surface. The forehead temperature measuring device according to claim 10, wherein a layer of black matte paint is applied to the surface of each of the saw teeth. The forehead temperature measurement device according to claim 10, wherein the surface of the reflection area is a parabolic mirror. The forehead temperature measuring device according to claim 10, wherein the surface of the reflection area is plated with a layer of nickel. The forehead temperature measurement device according to claim 10, wherein the surface profile of the reflection area is a paraboloid, an isosceles trapezoid or an elliptical surface.

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