JP7093332B2 - Vehicle detection heater device - Google Patents

Description

The present invention relates to a vehicle detection heater device.

Conventionally, a vehicle passage detection system including a heater unit for preventing ice and snow from adhering to a light receiving window portion is known (see, for example, Patent Document 1).
Patent Document 1 Japanese Unexamined Patent Publication No. 2016-72202

In the vehicle detection heater device, it is preferable to prevent ice and snow from adhering to the light receiving window portion of the vehicle detection device while reducing power consumption.

In the first aspect of the present invention, a vehicle detection heater device is provided. The vehicle detection heater device is provided on the back surface side of the first heater, the first heat insulating material provided on the back surface of the first heater, and the back surface side of the first heat insulating material, and the first heater moves from the first heater to the first heat insulating material. A support portion arranged apart from the first heat insulating material and a holding portion provided in a space between the back surface of the first heat insulating material and the support portion are provided in the direction. The holding portion is in contact with a part of the back surface of the first heat insulating material and is in contact with a part of the supporting portion.

The holding portion may be in line contact with a part of the back surface of the first heat insulating material.

In the second direction intersecting the first direction, the holding portion may be in line contact at two points on the back surface of the first heat insulating material. In the surface of the back surface of the first heat insulating material, the two contact lines in which the holding portion is in line contact may be arranged side by side.

One of the two contact lines may face the back surface of the first heater in the first direction.

The vehicle detection heater device may further include a first heat transfer plate. A glass plate may be provided on the front surface side of the first heater. The first heat transfer plate may be provided between the front surface of the first heater and the back surface of the glass plate.

The vehicle detection heater device may further include a second heat insulating material arranged side by side with the first heater in the second direction. The first heat insulating material and the first heat transfer plate may be stretched in the second direction. The second heat insulating material may be provided between the front surface of the first heat insulating material and the back surface of the first heat transfer plate in the first direction.

The other of the two contact lines may face the back surface of the second insulation in the first direction.

The vehicle detection heater device may further include a second heater arranged side by side with the first heater in the second direction. In the second direction, the second heat insulating material and the second heater may be arranged on one side and the other side of the first heater, respectively. In the second direction, the second heater may be disposed away from the first heater.

The vehicle detection heater device may further include a second heat transfer plate. The second heat transfer plate may be provided between the front surface of the second heater and the back surface of the glass plate.

The vehicle detection heater device may further include a third heater and a third heat transfer plate. The first heater and the second heater may extend in a third direction that intersects the first direction and intersects the second direction. One end of the first heater in the third direction may be connected to one end of the third heater. One end of the second heater in the third direction may be connected to the other end of the third heater. The first heat transfer plate and the second heat transfer plate may be stretched in the third direction. One end of the first heat transfer plate in the third direction may be connected to one side of the third heat transfer plate in the second direction. One end of the second heat transfer plate in the third direction may be connected to the other side of the third heat transfer plate in the second direction. At least a part of the third heater and at least a part of the third heat transfer plate may face each other in the first direction.

The thickness of the third heat transfer plate in the first direction may be larger than the thickness of the first heat transfer plate in the first direction, and may be larger than the thickness of the second heat transfer plate in the first direction.

Between the first heater and the second heater in the second direction, at least a part of the back surface of the glass plate may be in contact with the space between the first heater and the second heater.

The vehicle detection heater device may further include a heat transfer material provided on the front surface of the glass plate.

The vehicle detection heater device may further include a third heat insulating material provided between the holding portion and the supporting portion in the first direction. The holding portion may be in contact with a part of the front surface of the third heat insulating material.

The thermal resistance of the holding portion may be larger than the thermal resistance of the supporting portion.

The Young's modulus of the holding portion may be larger than the Young's modulus of the first heat insulating material.

The Young's modulus of the holding portion may be smaller than the Young's modulus of the first heat insulating material.

The bulk modulus of the holding portion may be smaller than the bulk modulus of the first heat insulating material.

The holding portion may have a curved surface. At least a part of the curved surface of the holding portion may be in contact with the back surface of the first heat insulating material.

The holding portion may be columnar. The central axis of the columnar holding portion may be parallel to the back surface of the first heat insulating material.

The outline of the above invention does not list all the necessary features of the present invention. A subcombination of these feature groups can also be an invention.

It is a figure which shows an example of the installation of the vehicle detection apparatus 300 which concerns on one Embodiment of this invention. It is a figure which shows an example of the vehicle detection apparatus 300 which concerns on one Embodiment of this invention. It is a figure which shows an example of the cross section of AA' in FIG. FIG. 3 is an enlarged view of the vehicle detection heater device 100 in FIG. It is a figure which shows the vehicle detection device 200 of the comparative example. It is a figure which shows an example of the vehicle detection apparatus 300 which concerns on one Embodiment of this invention. It is a figure which shows an example of the BB' cross section in FIG. It is a figure which shows an example of the elapsed time dependence of the temperature difference Δt between the measured temperature and the ambient temperature at the position S1, the position S4, the position S7 and the position S8 in FIG. It is a figure which shows an example of the relationship between the position in the 3rd direction (Z axis direction) of each measurement point, and the equilibrium arrival temperature Δtt. It is a figure which shows another example of the heater device 100 for vehicle detection which concerns on one Embodiment of this invention. It is a figure which shows another example of the heater device 100 for vehicle detection which concerns on one Embodiment of this invention.

Hereinafter, the present invention will be described through embodiments of the invention, but the following embodiments do not limit the invention within the scope of the claims. Also, not all combinations of features described in the embodiments are essential to the means of solving the invention.

FIG. 1 is a diagram showing an example of installation of a vehicle detection device 300 according to an embodiment of the present invention. The vehicle detection device 300-1 and the vehicle detection device 300-2 are arranged so as to face each other so as to sandwich the road 402 through which the vehicle or the like passes. In this example, the vehicle detection device 300-1 is a light emitting side device, and the vehicle detection device 300-2 is a light receiving side device. The vehicle detection device 300 is, for example, an ETC vehicle detection device.

Road 402 is an outdoor road through which vehicles and the like pass, for example, at interchanges and smart interchanges. However, the road 402 on which the vehicle detection device 300 is installed is not limited to the road.

In this example, the vehicle detection device 300-1 and the vehicle detection device 300-2 are installed on high-altitude portions 400 arranged on both sides of the road 402. The installation surface on which the vehicle detection device 300-1 and the vehicle detection device 300-2 are installed in the high place portion 400 is arranged at a position higher than the passing surface through which the vehicle or the like passes on the road 402. The high place portion 400 may be provided in a band shape along the road 402, and may be provided in an island shape in the vicinity of each of the vehicle detection device 300-1 and the vehicle detection device 300-2.

The high place portion 400 is made of concrete or the like. The high place portion 400 is fixed to the road 402. By providing the vehicle detection device 300-1 and the vehicle detection device 300-2 in the high place portion 400, the vehicle or the like is less likely to come into contact with the vehicle detection device 300-1 and the vehicle detection device 300-2.

The vehicle detection device 300 includes a fixing plate 70 and a glass plate 50. The glass plate 50 is fixed to the fixing plate 70. The vehicle detection device 300-1 and the vehicle detection device 300-2 are installed so that the glass plate 50 of the vehicle detection device 300-1 and the glass plate 50 of the vehicle detection device 300-2 face each other across the road 402. ing.

A light source and a light receiving unit are installed in the vehicle detection device 300-1 and the vehicle detection device 300-2, respectively. The light receiving unit of the vehicle detection device 300-2 receives the luminous flux 98 from the light source of the vehicle detection device 300-1. When a vehicle or the like passes through the road 402, the luminous flux 98 is temporarily blocked. The vehicle detection device 300 detects the vehicle by detecting this temporary interruption of the luminous flux 98.

FIG. 2 is a diagram showing an example of a vehicle detection device 300 according to an embodiment of the present invention. FIG. 2 is a view of the vehicle detection device 300 as viewed from the front (from the road 402 side). The vehicle detection device 300 includes a fixing plate 70, a glass plate 50, a first fixing portion 33, a second fixing portion 36, and a fixing member 74. The glass plate 50 is fixed to the fixing plate 70 by the second fixing portion 36. The second fixing portion 36 is fixed to the fixing plate 70 by the fixing member 74.

In the present specification, technical matters may be described using orthogonal coordinate axes of X-axis, Y-axis, and Z-axis. The Z axis may be parallel to the direction of gravity. The XY plane may be a horizontal plane. In the present specification, the plane parallel to the planes of the glass plate 50 and the fixed plate 70 is defined as the XZ plane, and the direction perpendicular to the planes of the glass plate 50 and the fixed plate 70 is defined as the Y axis.

In the present specification, the front side in the X-axis direction of FIG. 2 is referred to as a front surface side, and the back surface side is referred to as a back surface side. In the description of each configuration in the present specification, the front surface is referred to as a front surface, and the back surface is referred to as a back surface.

The glass plate 50 and the fixing plate 70 may be plate-shaped members having a plane parallel to the XZ plane. The fixing plate 70, the first fixing portion 33 and the second fixing portion 36 may be made of metal. The fixing plate 70 may be made of stainless steel. The fixing plate 70 of this example is made of SUS304.

A heat transfer material 66 may be provided on the front surface of the glass plate 50. The heat transfer material 66 may be a member having a plane parallel to the XZ plane. The heat transfer material 66 may be a sheet-shaped heat transfer material. The heat transfer material 66 may be formed of Al (aluminum).

A plurality of heat transfer materials 66 may be provided on the front surface of the glass plate 50. In this example, three heat transfer materials 66 (heat transfer material 66-1, heat transfer material 66-2, and heat transfer material 66-3) are provided on the front surface of the glass plate 50. The heat transfer material 66-1 and the heat transfer material 66-2 may be stretched in the Z-axis direction. The heat transfer material 66-3 may be stretched in the X-axis direction. The heat transfer material 66-1, the heat transfer material 66-2, and the heat transfer material 66-3 may be one heat transfer material 66 integrally formed.

The vehicle detection device 300 may include a plurality of first fixing portions 33 and a plurality of second fixing portions 36. The vehicle detection device 300 of this example includes four first fixing portions 33 and four second fixing portions 36. In this example, the glass plate 50 is fixed to the fixing plate 70 by the second fixing portion 36-1 and the second fixing portion 36-3 on one side in the X-axis direction, and is fixed to the fixing plate 70 on the other side in the X-axis direction. It is fixed to the fixing plate 70 by the portion 36-2 and the second fixing portion 36-4. In this example, the glass plate 50 is fixed to the fixing plate 70 by the second fixing portion 36-3 and the second fixing portion 36-4 on one side in the Z-axis direction, and is fixed to the fixing plate 70 on the other side in the Z-axis direction. It is fixed to the fixing plate 70 by the portion 36-1 and the second fixing portion 36-2.

FIG. 3 is a diagram showing an example of a cross section taken along the line AA in FIG. The AA'cross section is an XY cross section passing through the first fixing portion 33, the second fixing portion 36, the glass plate 50, the fixing plate 70 and the fixing member 74. FIG. 3 is a cross-sectional view of the vehicle detection device 300 in FIG. 2 as viewed from above the fixing plate 70.

The vehicle detection device 300 includes a vehicle detection heater device 100. In FIG. 3, the range of the vehicle detection heater device 100 is shown by a thick alternate long and short dash line frame.

The vehicle detection heater device 100 includes a first heater 10, a first heat insulating material 20, a support portion 30, and a holding portion 40. The first heat insulating material 20 is provided on the back surface 12 of the first heater 10. The support portion 30 is provided on the back surface 23 side of the first heat insulating material 20. The pressing portion 40 is provided in the space 80 between the back surface 23 of the first heat insulating material 20 and the supporting portion 30.

The holding portion 40 is in contact with a part of the supporting portion 30. The fact that the pressing portion 40 is in contact with a part of the supporting portion 30 means that the pressing portion 40 is in direct or indirect contact with a part of the supporting portion 30. In this example, the fact that the pressing portion 40 is indirectly in contact with a part of the supporting portion 30 means a state in which a heat insulating material is sandwiched between the pressing portion 40 and the supporting portion 30. In this example, the fifth heat insulating material 24 (described later) is sandwiched between the pressing portion 40 and the supporting portion 30.

In the present specification, the direction from the first heater 10 to the first heat insulating material 20 is defined as the first direction. In the present specification, the direction intersecting the first direction is referred to as the second direction. In the present specification, the direction that intersects with the first direction and intersects with the second direction is referred to as the third direction. The first direction, the second direction, and the third direction are, for example, the Y-axis direction, the X-axis direction, and the Z-axis direction, respectively. Hereinafter, in the present specification, technical matters will be described with the first direction, the second direction, and the third direction as the Y-axis direction, the X-axis direction, and the Z-axis direction, respectively.

A plurality of first heat insulating materials 20 may be provided on the back surface 12 of the first heater 10. The plurality of first heat insulating materials 20 may be laminated in the first direction (Y-axis direction). In this example, two first heat insulating materials 20 are provided on the back surface 12 of the first heater 10. In this example, the back surface 12 of the first heater 10 is provided with the first heat insulating material 20-1, and the back surface of the first heat insulating material 20-1 is provided with the first heat insulating material 20-2.

In this example, the front surface 21 and the back surface 23 are the front surface of the first heat insulating material 20-1 and the back surface of the first heat insulating material 20-2, respectively. The back surface 12 of the first heater 10 has a first heat insulating material 20 having a total thickness of the first heat insulating material 20-1 and the first heat insulating material 20-2 in the first direction (Y-axis direction). It may be provided.

The first heater 10 may be made of a material containing any of copper, iron and stainless steel. The first heater 10 may be a heater that generates heat by supplying an electric current. A covering material such as silicon rubber may be provided on the surface of the first heater 10.

The first heat insulating material 20 may be glass wool or rock wool. Glass wool is a cotton-like material made of glass fiber. Rock wool is, for example, an artificial mineral fiber produced by dissolving a mixture of basalt and lime. The first heat insulating material 20 may be a rubber material or a foamed resin. The first heat insulating material 20 is, for example, EPDM (ethylene propylene diene rubber).

The first heater 10 and the first heat insulating material 20 may have a plane parallel to the XZ plane. The first heater 10 and the first heat insulating material 20 may be extended in the third direction (Z-axis direction). The first heater 10 may be a so-called belt heater. When the first heater 10 is a belt heater, the stretching direction of the belt heater may be the Z-axis direction.

The vehicle detection heater device 100 may include a plurality of support portions 30. The vehicle detection heater device 100 of this example includes two support portions 30 (support portion 30-1 and support portion 30-2). In this example, the support portion 30-1 is provided on the back surface 12 side of the first heater 10, and the support portion 30-2 is provided on the back surface 16 (described later) side of the second heater 14 (described later).

The support portion 30 is arranged apart from the first heat insulating material 20 in the first direction (Y-axis direction). The support portion 30 may be a metal member. The support portion 30-1 may have a stretched portion 31-1 extending in the X-axis direction and a stretched portion 32-1 extending in the Y-axis direction in the XY cross section. The support portion 30-2 may have a stretched portion 31-2 extending in the X-axis direction and a stretched portion 32-2 extending in the Y-axis direction in the XY cross section. The support portion 30 may have an L-shape in the XY cross section.

The vehicle detection heater device 100 may include a plurality of holding portions 40. The vehicle detection heater device 100 of this example includes two pressing portions 40 (pressing portion 40-1 and pressing portion 40-2). In this example, the holding portion 40-1 is provided in the space 80 between the back surface 23 of the first heat insulating material 20-2 and the supporting portion 30-1, and the holding portion 40-2 is the first heat insulating material 20-3 ( It is provided in the space 80 between the back surface 42 (described later) and the support portion 30-2 (described later).

The pressing portion 40 may be extended in the third direction (Z-axis direction). The holding portion 40 may be a metal member and may be formed of a resin. The details of the holding portion will be described later.

The pressing portion 40 is in contact with a part of the back surface 23 of the first heat insulating material 20. The back surface 23 of this example is parallel to the XZ plane. The pressing portion 40 is in contact with a part of the back surface 23 of the first heat insulating material 20 when the pressing portion 40 is at least in the second direction (X-axis direction) and the third direction (Z-axis direction) on the back surface 23. In part, it refers to a state in which it is in contact with the back surface 23 of the first heat insulating material 20.

The vehicle detection heater device 100 may further include a second heat insulating material 22. The second heat insulating material 22 may have a plane parallel to the XZ plane and may be extended in the third direction (Z-axis direction). The second heat insulating material 22 may be made of the same material as the first heat insulating material 20.

The vehicle detection heater device 100 may further include a second heater 14. The second heater 14 may be arranged side by side with the first heater 10 in the second direction (X-axis direction). In the second direction (X-axis direction), the second heat insulating material 22 and the second heater 14 may be arranged on one side and the other side of the first heater 10, respectively. In the second direction (X-axis direction), the second heater 14 may be arranged apart from the first heater 10. In this example, the second heater 14 is arranged apart from the first heater 10 in the width W2 (described later) in the second direction (X-axis direction).

A plurality of first heat insulating materials 20 may be provided on the back surface 16 of the second heater 14. The plurality of first heat insulating materials 20 may be laminated in the first direction (Y-axis direction). In this example, two first heat insulating materials 20 are provided on the back surface 16 of the second heater 14. In this example, the back surface 16 of the second heater 14 is provided with the first heat insulating material 20-3, and the back surface of the first heat insulating material 20-3 is provided with the first heat insulating material 20-4. In this example, the front surface 41 and the back surface 42 are the front surface of the first heat insulating material 20-3 and the back surface of the first heat insulating material 20-4, respectively.

In this example, the support portion 30-1 and the support portion 30-2 are arranged apart from the first heat insulating material 20-2 and the first heat insulating material 20-4 in the first direction (Y-axis direction), respectively. .. A pressing portion 40-1 is provided in the space 80 between the back surface 23 of the first heat insulating material 20-2 and the supporting portion 30-1. A pressing portion 40-2 is provided in the space 80 between the back surface 42 of the first heat insulating material 20-3 and the supporting portion 30-2. The pressing portion 40-1 is in contact with a part of the back surface 23 of the first heat insulating material 20-2. The pressing portion 40-2 is in contact with a part of the back surface 42 of the first heat insulating material 20-4. The pressing portion 40-1 is in contact with a part of the supporting portion 30-1. The pressing portion 40-2 is in contact with a part of the supporting portion 30-2.

The vehicle detection heater device 100 may further include a first heat transfer plate 60 and a second heat transfer plate 62. The first heat transfer plate 60 and the second heat transfer plate 62 may be plate-shaped members having a plane parallel to the XZ plane. The first heat transfer plate 60 and the second heat transfer plate 62 may be extended in the third direction (Z-axis direction). The first heat transfer plate 60 and the second heat transfer plate 62 may be made of metal. The first heat transfer plate 60 and the second heat transfer plate 62 of this example are made of Al (aluminum).

In this example, the glass plate 50 is provided on the front surface 11 side of the first heater 10 and the front surface 15 side of the second heater 14. In this example, the first heat transfer plate 60 is provided between the front surface 11 of the first heater 10 and the back surface 52 of the glass plate 50. In this example, the second heat transfer plate 62 is provided between the front surface 15 of the second heater 14 and the back surface 52 of the glass plate 50.

The front surface of the first heat transfer plate 60 and the front surface of the second heat transfer plate 62 may be in contact with the back surface 52 of the glass plate 50. The back surface of the first heat transfer plate 60 and the back surface of the second heat transfer plate 62 may be in contact with the front surface 11 of the first heater 10 and the front surface 15 of the second heater 14, respectively.

The pressing portion 40-1 applies stress to the first heat insulating material 20, the first heater 10, and the first heat transfer plate 60 in the direction from the first heater 10 to the glass plate 50. By applying the stress to the first heat insulating material 20, the first heater 10, and the first heat transfer plate 60, the adhesion between the first heater 10 and the first heat transfer plate 60, and the first heat transfer plate The adhesion between the 60 and the glass plate 50 is likely to be improved. As a result, the heat from the first heater 10 is easily propagated to the glass plate 50.

The pressing portion 40-2 applies stress to the first heat insulating material 20, the second heater 14, and the second heat transfer plate 62 in the direction from the second heater 14 to the glass plate 50. By applying the stress to the first heat insulating material 20, the second heater 14, and the second heat transfer plate 62, the adhesion between the second heater 14 and the second heat transfer plate 62 and the second heat transfer plate 62 are achieved. The adhesion between the 62 and the glass plate 50 is likely to be improved. As a result, the heat from the second heater 14 is easily propagated to the glass plate 50.

The vehicle detection device 300 further includes a light source 90. The light source 90 may be provided on the back surface 52 side of the glass plate 50 in the XY cross section. The light source 90 may be arranged between the first heater 10 and the second heater 14 in the second direction (X-axis direction). In FIG. 3, the optical axis 92 of the luminous flux 98 emitted from the light source 90 is shown by a thick solid line. The vehicle detection device 300-1 in FIG. 1 may be provided with a light source 90, and the vehicle detection device 300-2 may be provided with a light receiving unit at a position of the light source 90 in the XY cross section.

In the second direction (X-axis direction), the space between the first heater 10 and the second heater 14 is defined as a space 82. In the second direction (X-axis direction), at least a part of the glass plate 50 in contact with the space 82 is a window portion 54. A first heater 10 is arranged on one side of the window portion 54 in the second direction (X-axis direction), and a second heater 14 is arranged on the other side. In this example, the width of the window portion 54 in the second direction (X-axis direction) is equal to the width W2 (described later).

After passing through the space 82, the luminous flux 98 penetrates the glass plate 50 from the back surface 52 to the front surface 51. The luminous flux 98 penetrates the window portion 54 of the glass plate 50. After penetrating the window portion 54, the luminous flux 98 travels in the first direction (Y-axis direction) with respect to the glass plate 50 on the opposite side of the light source 90 and in the direction of the arrow indicated by the broken line.

The pressing portion 40-1 and the pressing portion 40-2 are provided with a temperature measuring point TpL and a temperature measuring point TpR in the space 80, respectively. The back surface 52 of the glass plate 50 is provided with a temperature measurement point TpC in the space 82. The temperature measurement point TpC may be arranged at a position that does not interfere with the control of the direction of the optical axis 92 and the control of heat generation from the first heater 10 and the second heater 14. The temperature measurement point TpL, the temperature measurement point TpR, and the temperature measurement point TpC will be described later.

In the vehicle detection heater device 100 of this example, the first heat insulating material 20 is provided on the back surface 12 of the first heater 10, and the pressing portion 40 is between the back surface 23 of the first heat insulating material 20 and the support portion 30. The holding portion 40 is provided in the space 80 and is in contact with a part of the back surface 23 of the first heat insulating material 20. Therefore, in the vehicle detection heater device 100 of this example, heat dissipation of the first heater 10 from the back surface 12 of the first heater 10 toward the support portion 30 can be suppressed. Further, in the vehicle detection heater device 100 of this example, the adhesion between the first heater 10 and the first heat insulating material 20 is improved by applying the above-mentioned stress to the first heat insulating material 20 and the first heater 10. It will be easier to improve. Therefore, the heat of the first heater 10 is likely to propagate from the front surface 11 of the first heater 10 toward the glass plate 50. Therefore, the vehicle detection heater device 100 of this example can easily reduce the power consumption associated with the heat generation of the first heater 10. Similarly, the vehicle detection heater device 100 of this example can easily reduce the power consumption associated with the heat generation of the second heater 14.

The vehicle detection device 300 is, for example, an ETC vehicle detection device. When the vehicle detection device 300 is an ETC vehicle detection device, the ETC vehicle detection device may be installed in a cold region. In cold regions, there are many cases of snowfall in winter, and the temperature in winter tends to be below freezing. Therefore, the snow that has fallen tends to adhere to the ETC vehicle detection device. Further, when the temperature is below the freezing point, the snow adhering to the ETC vehicle detection device tends to freeze.

The ETC vehicle detection device detects a vehicle by irradiating light. Therefore, when snow adheres to the ETC vehicle detection device, the light from the light source may be blocked by the snow. When the light from the light source is blocked, it becomes difficult for the ETC vehicle detection device to detect the vehicle.

In the vehicle detection heater device 100 of this example, as described above, the heat of the first heater 10 is likely to be dissipated from the front surface 11 of the first heater 10 toward the glass plate 50. Therefore, in the vehicle detection device 300 of this example, even if snow adheres to the glass plate 50, the snow is likely to melt due to the heat from the first heater 10. Therefore, the vehicle detection device 300 of this example can easily detect a vehicle even in a snowfall environment and a temperature environment below freezing point.

In this example, since the first heater 10 is arranged on one side of the window portion 54 in the second direction (X-axis direction) and the second heater 14 is arranged on the other side, they adhere to the window portion 54. The snow is easily heated by the first heater 10 and the second heater 14. Therefore, the snow adhering to the window portion 54 is easily melted by the heat from the first heater 10 and the second heater 14. Therefore, the optical path of the luminous flux 98 is likely to be secured in the window portion 54. Therefore, the vehicle detection device 300 of this example can easily detect a vehicle even in a snowfall environment and a temperature environment below freezing point.

In this example, the heat transfer material 66-1 and the heat transfer material 66-2 are provided on the front surface 51 of the glass plate 50. In this example, the heat transfer material 66-1 and the heat transfer material 66-2 are arranged at positions facing the first heater 10 and the second heater 14 in the first direction (Y-axis direction), respectively. In this example, the heat transfer material 66-1 and the heat transfer material 66-2 are provided so as to sandwich the window portion 54 in the second direction (X-axis direction). When the heat transfer material 66 is provided on the front surface 51 of the glass plate 50, the heat of the first heater 10 is higher than that when the heat transfer material 66 is not provided on the front surface of the first heater 10. It becomes easier to propagate from the surface 11 toward the glass plate 50.

The thickness of the glass plate 50 is defined as the thickness Tg. The thickness of the heat transfer material 66 is defined as the thickness Ts. The thickness Tg and the thickness Ts will be described later.

The vehicle detection device 300 may further include a plurality of first fixing portions 33. The vehicle detection device 300 of this example further includes two first fixing portions 33 (first fixing portion 33-1 and first fixing portion 33-2). The first heater 10, the second heater 14, the first heat insulating material 20, the support portion 30, the holding portion 40, the glass plate 50, the first heat transfer plate 60, the second heat transfer plate 62, and the heat transfer material 66 are second. It may be arranged between the first fixed portion 33-1 and the first fixed portion 33-2 in the direction (X-axis direction).

The first fixing portion 33-1 may have a stretched portion 34-1 extending in the second direction (X-axis direction) and a stretched portion 35-1 extending in the first direction (Y-axis direction). The first fixing portion 33-2 may have a stretched portion 34-2 extending in the second direction (X-axis direction) and a stretched portion 35-2 extending in the first direction (Y-axis direction). The first fixing portion 33 may have an L-shape in the XY cross section.

The vehicle detection device 300 may further include a plurality of second fixing portions 36. The vehicle detection device 300 of this example includes two second fixing portions 36 (second fixing portion 36-1 and second fixing portion 36-2). The first heater 10, the second heater 14, the first heat insulating material 20, at least a part of the support portion 30 in the second direction (X-axis direction), the holding portion 40, and the glass plate 50 in the second direction (X-axis direction). At least a part of the first heat transfer plate 60, the second heat transfer plate 62 and the heat transfer material 66 have the second fixing portion 36-1 and the second fixing portion 36-2 in the second direction (X-axis direction). It may be placed in between.

The second fixing portion 36-1 includes a stretched portion 37-1 and a stretched portion 38-1 extending in the second direction (X-axis direction), and a stretched portion 39-1 extending in the first direction (Y-axis direction). May have. The second fixing portion 36-2 includes a stretched portion 37-2 and a stretched portion 38-2 extending in the second direction (X-axis direction), and a stretched portion 39-2 extending in the first direction (Y-axis direction). May have. The second fixed portion 36-1 has a crank shape in which the stretched portion 37-1 and the stretched portion 38-1 are connected to both ends of the stretched portion 39-1 in the first direction (Y-axis direction) in the XY cross section. May have. The second fixed portion 36-2 has a crank shape in which the stretched portion 37-2 and the stretched portion 38-2 are connected to both ends of the stretched portion 39-2 in the first direction (Y-axis direction) in the XY cross section. May have.

The stretched portion 35-1 in the first fixed portion 33-1 may face the stretched portion 32-1 of the support portion 30-1. The stretched portion 35-2 in the first fixed portion 33-2 may face the stretched portion 32-2 of the support portion 30-2. The first fixing portion 33 and the supporting portion 30 may be fixed by the fixing member 72. In this example, the stretched portion 35-1 and the stretched portion 32-1 are fixed by the fixing member 72-1, and the stretched portion 35-2 and the stretched portion 32-2 are fixed by the fixing member 72-2. ..

The fixing plate 70-1 and the fixing plate 70-2 are the fixing plates 70 on the first fixing portion 33-1 side and the first fixing portion 33-2 side in the XY cross section, respectively. The fixing plate 70 is provided with an opening 69. In the XY cross section, the opening 69 is a region between the fixing plate 70-1 and the fixing plate 70-2 in the second direction (X-axis direction). The opening 69 will be described later.

The first heater 10, the second heater 14, the first heat insulating material 20, at least a part of the support portion 30 in the second direction (X-axis direction), the holding portion 40, and the glass plate 50 in the second direction (X-axis direction). At least a part of the first heat transfer plate 60, the second heat transfer plate 62 and the heat transfer material 66 are arranged between the fixing plate 70-1 and the fixing plate 70-2 in the second direction (X-axis direction). It's okay.

The fixing plate 70 and the first fixing portion 33 may be fixed by a fixing member 73. The fixing plate 70 and the second fixing portion 36 may be fixed by a fixing member 74. In this example, the fixing plate 70 and the stretched portion 34-1 are fixed by the fixing member 73-1, and the fixing plate 70 and the stretched portion 34-2 are fixed by the fixing member 73-2. In this example, the fixing plate 70 and the stretched portion 37-1 are fixed by the fixing member 74-1, and the fixing plate 70 and the stretched portion 37-2 are fixed by the fixing member 74-2.

Between the first heat insulating material 20-2 and the first fixing portion 33-1 in the second direction (X-axis direction), and between the fixing plate 70-1 and the supporting portion 30-1 in the first direction (Y-axis direction). The space between and is referred to as space 91. Between the first heat insulating material 20-4 and the first fixing portion 33-2 in the second direction (X-axis direction), and between the fixing plate 70-2 and the supporting portion 30-2 in the first direction (Y-axis direction). The space between and is referred to as space 97. The space 91 may communicate with the space 80 between the back surface 23 of the first heat insulating material 20-2 and the support portion 30-1. The space 97 may communicate with the space 80 between the back surface 42 of the first heat insulating material 20-4 and the support portion 30-2. Space 91 and space 97 will be described later.

The vehicle detection device 300 may further include a plurality of third heat insulating materials 26 and a plurality of fourth heat insulating materials 28. The vehicle detection device 300 of this example further includes two third heat insulating materials 26 (third heat insulating material 26-1 and third heat insulating material 26-2). The vehicle detection device 300 of this example further includes two fourth heat insulating materials 28 (fourth heat insulating material 28-1 and fourth heat insulating material 28-2). The third heat insulating material 26 and the fourth heat insulating material 28 may be stretched in the third direction (Z-axis direction). The third heat insulating material 26 and the fourth heat insulating material 28 may be made of the same material as the first heat insulating material 20.

The first heater 10, the second heater 14, the first heat insulating material 20, at least a part of the support portion 30 in the second direction (X-axis direction), the holding portion 40, and the glass plate 50 in the second direction (X-axis direction). At least a part of the first heat transfer plate 60, the second heat transfer plate 62 and the heat transfer material 66 are the third heat insulating material 26-1 and the third heat insulating material 26-2 in the second direction (X-axis direction). It may be arranged in between and between the fourth heat insulating material 28-1 and the fourth heat insulating material 28-2.

The third heat insulating material 26-1 may be sandwiched between the glass plate 50 and the fixing plate 70-1 in the first direction (Y-axis direction). The third heat insulating material 26-1 may be in contact with the back surface 52 of the glass plate 50 and the front surface of the fixing plate 70-1. The third heat insulating material 26-1 may be provided at the end portion of the glass plate 50 on the first fixing portion 33-1 side in the second direction (X-axis direction). The third heat insulating material 26-1 may be provided at the end portion of the fixing plate 70-1 on the first fixing portion 33-2 side in the second direction (X-axis direction).

The third heat insulating material 26-2 may be sandwiched between the glass plate 50 and the fixing plate 70-2 in the first direction (Y-axis direction). The third heat insulating material 26-2 may be in contact with the back surface 52 of the glass plate 50 and the front surface of the fixing plate 70-2. The third heat insulating material 26-2 may be provided at the end portion of the glass plate 50 on the first fixing portion 33-2 side in the second direction (X-axis direction). The third heat insulating material 26-2 may be provided at the end portion of the fixing plate 70-2 on the first fixing portion 33-1 side in the second direction (X-axis direction).

The fourth heat insulating material 28-1 may be sandwiched between the glass plate 50 and the stretched portion 38-1 of the second fixing portion 36-1 in the first direction (Y-axis direction). The fourth heat insulating material 28-1 may be in contact with the front surface 51 of the glass plate 50 and the back surface of the stretched portion 38-1. The fourth heat insulating material 28-1 may be provided at the end portion of the glass plate 50 on the first fixing portion 33-1 side in the second direction (X-axis direction). The fourth heat insulating material 28-1 may be provided at the end portion of the stretched portion 38-1 on the first fixing portion 33-2 side in the second direction (X-axis direction).

The fourth heat insulating material 28-2 may be sandwiched between the glass plate 50 and the stretched portion 38-2 of the second fixing portion 36-2 in the first direction (Y-axis direction). The fourth heat insulating material 28-2 may be in contact with the front surface 51 of the glass plate 50 and the back surface of the stretched portion 38-2. The fourth heat insulating material 28-2 may be provided at the end portion of the glass plate 50 on the first fixing portion 33-2 side in the second direction (X-axis direction). The fourth heat insulating material 28-2 may be provided at the end of the stretched portion 38-2 on the first fixing portion 33-1 side in the second direction (X-axis direction).

The vehicle detection heater device 100 may further include a fifth heat insulating material 24 provided between the pressing portion 40 and the supporting portion 30 in the first direction (Y-axis direction). The vehicle detection heater device 100 may further include a plurality of fifth heat insulating materials 24. The vehicle detection heater device 100 of this example includes two fifth heat insulating materials 24 (fifth heat insulating material 24-1 and fifth heat insulating material 24-2). In this example, the fifth heat insulating material 24-1 and the fifth heat insulating material 24-2 are placed between the holding portion 40-1 and the supporting portion 30-1 and in the holding portion in the first direction (Y-axis direction). It is provided between 40-2 and the support portion 30-2, respectively. The fifth heat insulating material 24 may have a plane parallel to the XZ plane and may be extended in the third direction (Z-axis direction). The fifth heat insulating material 24 may be made of the same material as the first heat insulating material 20.

Since the vehicle detection heater device 100 of this example further includes a fifth heat insulating material 24-1 provided between the pressing portion 40-1 and the supporting portion 30-1 in the first direction (Y-axis direction). The heat propagated from the first heater 10 to the pressing portion 40-1 is less likely to propagate to the supporting portion 30-1 than in the case where the fifth heat insulating material 24-1 is not provided. Therefore, in the vehicle detection heater device 100 of this example, the heat of the first heater 10 tends to propagate from the front surface 11 of the first heater 10 toward the glass plate 50.

In the second direction (X-axis direction), the end position on the window portion 54 side and the end position on the first fixing portion 33 side of the fifth heat insulating material 24 are the end position on the window portion 54 side and the end position on the support portion 30. It may coincide with the end position on the first fixed portion 33 side. The back surface 77 of the fifth heat insulating material 24-1 may be in contact with the stretched portion 31-1 of the support portion 30-1. The back surface 79 of the fifth heat insulating material 24-2 may be in contact with the stretched portion 31-2 of the support portion 30-2.

FIG. 4 is an enlarged view of the vehicle detection heater device 100 in FIG. In the second direction (X-axis direction), the first fixing portion 33-1 (FIG. 3) in the first heat insulating material 20-1, the first heat insulating material 20-2, the first heat transfer plate 60 and the heat transfer material 66-1. 3) The position of each end on the side is defined as the position P1. In the second direction (X-axis direction), the end position on the first fixed portion 33-2 (see FIG. 3) side of the first heater 10 is defined as the position P2. In the second direction (X-axis direction), the position of each end of the second heater 14 on the side of the first fixed portion 33-1 (see FIG. 3) is defined as the position P3. In the second direction (X-axis direction), the first fixing portion 33-2 in the first heat insulating material 20-3, the first heat insulating material 20-4, the second heat transfer plate 62 and the heat transfer material 66-2 (FIG. 3) The end position on the side is the position P4.

In the second direction (X-axis direction), the width between the positions P1 and P2, the width between the positions P2 and P3, and the width between the positions P3 and P4 are the widths W1 and P4, respectively. The width W2 and the width W1'. The width W1'may be equal to or different from the width W1. The width W2 may be smaller than the width W1 and may be equal to the width W1. The width W2 may be smaller than the width W1'and may be equal to the width W1'.

The width W1 and the width W1'may be 1.0 times or more and 3.0 times or less of the width W2, 1.0 times or more and 2.0 times or less of the width W2, and 1.0 of the width W2. It may be double or more and 1.5 times or less. The width W2 may be 10 mm or more and 30 mm or less. The width W2 is, for example, 20 mm. The width W1 and the width W1'may be 20 mm or more and 40 mm or less. The width W1 and the width W1'are, for example, 27.5 mm.

The thickness of the first heater 10 and the second heater 14 is defined as the thickness Th. The thickness of the first heat insulating material 20 is defined as the thickness Ti. The thickness of the first heat transfer plate 60 and the second heat transfer plate 62 is defined as the thickness Tr. The width of the holding portion 40 in the first direction (Y-axis direction) is defined as the width Wp. The width of the space 80 in the first direction (Y-axis direction) is equal to the width Wp.

The thickness Ti may be determined based on the temperature of the back surface 12 when the first heater 10 generates heat and the temperature of the back surface 16 when the second heater 14 generates heat. The larger the thickness Ti, the smaller the amount of heat propagated from the front surface 21 to the back surface 23 of the first heat insulating material 20. Therefore, the larger the thickness Ti, the lower the temperature on the back surface 23 of the first heat insulating material 20 can be.

The thickness Ti may be 1.2 times or more and 3.0 times or less of the thickness Th, and may be 1.5 times or more and 2.0 times or less. The thickness Tr may be 0.05 times or more and 0.2 times or less of the thickness Th, and may be 0.08 times or more and 0.15 times or less. The thickness Th, the thickness Ti and the thickness Tr are, for example, 3.8 mm, 6.0 mm and 0.3 mm, respectively.

The thickness Tg of the glass plate 50 (see FIG. 3) may be 0.4 times or more and 1.2 times or less of the thickness Th, and may be 0.6 times or more and 1.0 times or less. The thickness Ts of the heat transfer material 66 (see FIG. 3) may be 0.01 times or more and 0.2 times or less of the thickness Ti, and may be 0.02 times or more and 0.1 times or less. The thickness Tg and the thickness Ts are, for example, 3.0 mm and 0.08 mm, respectively.

The width Wp of the space 80 may be 1.0 times or more and 3.0 times or less of the thickness Th, and may be 1.4 times or more and 2.0 times or less. The width Wp is, for example, 7.0 mm.

The back surface 52 (see FIG. 3) of the glass plate 50 (see FIG. 3) between the first heater 10 and the second heater 14 (that is, between the positions P2 and P3) in the second direction (X-axis direction). At least a part of the space 82 may be in contact with the space 82. In this example, between the positions P2 and the positions P3 in the second direction (X-axis direction), all of the back surface 52 of the glass plate 50 is in contact with the space 82. The space 82 and the space 80 may communicate with each other.

In the second direction (X-axis direction), the first fixing portion 33-2 in the first heat insulating material 20-1, the first heat insulating material 20-2, the first heat transfer plate 60 and the heat transfer material 66-1 (FIG. The end position on the side (see 3) may be equal to the position P2. In the second direction (X-axis direction), the first fixing portion 33-1 (FIG. 3) in the first heat insulating material 20-3, the first heat insulating material 20-4, the second heat transfer plate 62 and the heat transfer material 66-2. The end position on the side (see 3) may be equal to the position P3.

In the first direction (Y-axis direction), the distance from the back surface 52 of the glass plate 50 to the back surface 23 of the first heat insulating material 20-1 is defined as the distance D. The distance D is equal to the sum of the thickness Tr, the thickness Th, and the thickness Ti. When the thickness Tr, the thickness Th, and the thickness Ti are 0.3 mm, 3.8 mm, and 6.0 mm, respectively, the distance D is 10.1 mm.

In the XY plane, the optical axis 92 (see FIG. 3) of the luminous flux 98 (see FIG. 3) and the back surface 52 of the glass plate 50 form a predetermined angle. The angle may change depending on the relative positional relationship between the light source 90 and the vehicle detected by the vehicle detection heater device 100. The permissible range of the angle may be determined by the assumed relative positional relationship between the light source 90 and the vehicle. The permissible range of the angle may be 80 degrees or more and 100 degrees or less, and may be 86 degrees or more and 104 degrees or less. In the example of FIG. 3, the angle is 90 degrees. The width W2 may be determined based on the allowable range of the angle formed by the optical axis 92 and the back surface 52, the distance D, and the predetermined intensity of the light penetrating the glass plate 50.

The width W2 may be 0.6 times or more and 4.0 times or less of the distance D, and may be 1.0 times or more and 3.0 times or less. The width W2 may be 1.98 times the distance D.

The pressing portion 40 may be in line contact with a part of the back surface 23 of the first heat insulating material 20. In this example, the pressing portion 40-1 and the pressing portion 40-2 are in line contact with a part of the back surface 23 of the first heat insulating material 20-2 and a part of the back surface 42 of the first heat insulating material 20-4, respectively. .. In this example, the contact line 46 between the pressing portion 40-1 and a part of the back surface 23 and the contact line 47 between the pressing portion 40-2 and a part of the back surface 42 are in the third direction (Z-axis direction). It is stretched to.

The widths of the pressing portion 40-1 and the pressing portion 40-2 in the second direction (X-axis direction) are defined as the width W3 and the width W3', respectively. The width W3 and the width W3'may be equal or different. The width W3 and the width W3'may be 10 mm or more and 20 mm or less. The width W3 and the width W3'are, for example, 14 mm.

In this example, the fact that the pressing portion 40-1 and a part of the back surface 23 are in line contact means that the width of the contact line 46 in the second direction (X-axis direction) is 1/10 or less of the width W3. Point to. In the present specification, the contact state between the pressing portion 40-1 and a part of the back surface 23 when the width of the contact line 46 in the second direction (X-axis direction) is larger than 1/10 of the width W3 is described as a surface. Defined as contact.

Air exists in the space 80. The heat insulating property of air is higher than the heat insulating property of the holding portion 40. The contact area between the back surface 23 and the space 80 when the pressing portion 40-1 and a part of the back surface 23 are in line contact is when the pressing portion 40-1 and a part of the back surface 23 are in surface contact. It is larger than the contact area between the back surface 23 and the space 80 in. In this example, since the pressing portion 40-1 is in line contact with a part of the back surface 23, the first heater 10 is more than in the case where the pressing portion 40-1 and a part of the back surface 23 are in surface contact. It is possible to suppress heat dissipation from the first heater 10 in the direction of the support portion 30 from the back surface 12 of the above. Therefore, in the vehicle detection heater device 100 of this example, the heat of the first heater 10 tends to propagate from the front surface 11 of the first heater 10 toward the glass plate 50 (see FIG. 3).

Air exists in the space 91 and the space 97. Due to the presence of the space 91, heat dissipation of the first heater 10 from the back surface 12 of the first heater 10 toward the support portion 30 can be further suppressed. Due to the presence of the space 97, heat dissipation of the second heater 14 from the back surface 16 of the second heater 14 toward the support portion 30 can be further suppressed.

The pressing portion 40-1 may be in line contact at a plurality of positions on the back surface 23 of the first heat insulating material 20 in the second direction (X-axis direction). In this example, the pressing portion 40-1 is in line contact at two points on the back surface 23 of the first heat insulating material 20-2 in the second direction (X-axis direction). Therefore, the pressing portion 40-1 presses the back surface 23 more evenly in the first direction (Y-axis direction) than in the case where the back surface 23 is in line contact at one position in the second direction (X-axis direction). It will be easier. Therefore, the adhesion between the first heater 10 and the first heat transfer plate 60 is higher than that in the case where the pressing portion 40-1 is in line contact at one point on the back surface 23 in the second direction (X-axis direction). 1 The adhesion between the heat transfer plate 60 and the glass plate 50 and the adhesion between the first heater 10 and the first heat insulating material 20 are likely to be improved. In this example, the pressing portion 40-2 is in line contact at two points on the back surface 42 of the first heat insulating material 20-4 in the second direction (X-axis direction).

In the second direction (X-axis direction), the end position on the first fixed portion 33-1 (see FIG. 3) side of the first heater 10 is defined as the position P5. In the second direction (X-axis direction), the end position on the first fixed portion 33-2 (see FIG. 3) side of the second heater 14 is defined as the position P6.

In the second direction (X-axis direction), the positions of the two contact lines 46 where the pressing portion 40-1 and the back surface 23 of the first heat insulating material 20 are in line contact are defined as position Q1 and position Q2, respectively. In the second direction (X-axis direction), the position Q2 is located closer to the window portion 54 than the position Q1. The contact lines 46 at positions Q1 and Q2 are referred to as contact lines 46-2 and contact lines 46-1, respectively.

The contact line 46-1 may face the back surface 12 of the first heater 10 in the first direction (Y-axis direction). The contact line 46-2 does not have to face the back surface 12 of the first heater 10 in the first direction (X-axis direction).

The heat of the first heater 10 propagating from the back surface 12 of the first heater 10 tends to propagate in the first direction (Y-axis direction). Therefore, in the first direction (Y-axis direction), one of the two contact lines 46 (contact line 46-1) faces the back surface 12 of the first heater 10, and the other (contact line 46-2) is the first. By not facing the back surface 12 of the 1 heater 10, heat dissipation from the first heat insulating material 20 to the holding portion 40-1 is suppressed as compared with the case where both of the two contact lines 46 face the back surface 12 of the first heater 10. It becomes easy to be done.

In the second direction (X-axis direction), the positions of the two contact lines 47 where the holding portion 40-2 and the back surface 42 of the first heat insulating material 20 are in line contact are defined as positions Q3 and Q4, respectively. In the second direction (X-axis direction), the position Q3 is located closer to the window portion 54 than the position Q4. The contact lines 47 at the positions Q3 and Q4 are referred to as contact lines 47-2 and contact lines 47-1, respectively.

The contact line 47-1 may face the back surface 16 of the second heater 14 in the first direction (Y-axis direction). The contact line 47-2 does not have to face the back surface 16 of the second heater 14 in the first direction (X-axis direction).

In the second direction (X-axis direction), the second heat insulating material 22 provided on the first heater 10 side and the second heater 14 side of the window portion 54 is provided with the second heat insulating material 22-1 and the second heat insulating material 22, respectively. Let it be -2. The second heat insulating material 22-1 may be arranged side by side with the first heater 10 in the second direction (X-axis direction). The second heat insulating material 22-1 may be arranged side by side with the first heater 10 on the outside of the first heater 10 (between the position P1 and the position P5) in the second direction (X-axis direction). The first heat insulating material 20-1, the first heat insulating material 20-2, the first heat transfer plate 60, and the heat transfer material 66-1 may be stretched in the second direction (X-axis direction). The second heat insulating material 22-1 has a front surface 21 of the first heat insulating material 20 and a back surface 63 of the first heat transfer plate 60 on the outside of the first heater 10 (between the positions P1 and P5). It may be provided between the first direction (Y-axis direction).

The second heat insulating material 22-1 may be in contact with the first heater 10 at the position P5. In the second direction (X-axis direction), the end position on the first fixing portion 33-1 (see FIG. 3) side of the second heat insulating material 22-1 may be equal to the position P1. The front surface 56 of the second heat insulating material 22-1 may be in contact with the back surface 63 of the first heat transfer plate 60. The back surface 57 of the second heat insulating material 22-1 may be in contact with the front surface 21 of the first heat insulating material 20-1. The thickness of the second heat insulating material 22 may be equal to the thickness Th.

The second heat insulating material 22-2 may be arranged side by side with the second heater 14 in the second direction (X-axis direction). The second heat insulating material 22-2 may be arranged side by side with the second heater 14 on the outside (between the position P6 and the position P4) of the second heater 14 in the second direction (X-axis direction). The first heat insulating material 20-3, the first heat insulating material 20-4, the second heat transfer plate 62, and the heat transfer material 66-2 may be stretched in the second direction (X-axis direction). The second heat insulating material 22-2 is located on the outside of the second heater 14 (between the positions P6 and P4), the front surface 41 of the first heat insulating material 20-3 and the back surface 65 of the second heat transfer plate 62. It may be provided between and in the first direction (Y-axis direction).

The second heat insulating material 22-2 may be in contact with the second heater 14 at the position P6. In the second direction (X-axis direction), the end position on the first fixing portion 33-2 (see FIG. 3) side of the second heat insulating material 22-2 may be equal to the position P4. The front surface 58 of the second heat insulating material 22-2 may be in contact with the back surface 65 of the second heat transfer plate 62. The back surface 59 of the second heat insulating material 22-2 may be in contact with the front surface 41 of the first heat insulating material 20-3.

In the vehicle detection heater device 100 of this example, the first heat insulating material 20-1 and the first heat insulating material 20-2, and the first heat transfer plate 60 are extended in the second direction (X-axis direction), and The second heat insulating material 22-1 is located outside the first heater 10 in the first direction (Y-axis direction) of the front surface 21 of the first heat insulating material 20-1 and the back surface 63 of the first heat transfer plate 60. It is provided in between. Therefore, the heat from the first heater 10 tends to propagate in the second direction (X-axis direction) of the first heat transfer plate 60 and in the direction from the first heater 10 to the second heat insulating material 22-1. Therefore, the heat from the first heater 10 is likely to propagate between the position P1 and the position P2 on the front surface 51 (see FIG. 3) side of the glass plate 50 (see FIG. 3).

In the vehicle detection heater device 100 of this example, the first heat insulating material 20-3, the first heat insulating material 20-4, and the second heat transfer plate 62 are extended in the second direction (X-axis direction), and The second heat insulating material 22-2 is provided on the outside of the second heater 14 in the first direction (Y-axis direction) between the front surface 41 of the first heat insulating material 20-3 and the back surface 65 of the second heat transfer plate 62. It is provided in between. Therefore, the heat from the second heater 14 tends to propagate in the second direction (X-axis direction) of the second heat transfer plate 62 and in the direction from the second heater 14 to the second heat insulating material 22-2. Therefore, the heat from the second heater 14 is likely to propagate between the position P3 and the position P4 on the front surface 51 (see FIG. 3) side of the glass plate 50 (see FIG. 3).

As described above, in the vehicle detection heater device 100 of this example, the heat from the first heater 10 is likely to propagate in the direction toward the second heat insulating 22-1, and the heat from the second heater 14 is the second. 2 Easy to propagate in the direction of the heat insulating material 22-2. Therefore, in the vehicle detection device 300 (see FIG. 3) of this example, snow is unlikely to accumulate on the front surface 51 of the window portion 54 of the glass plate 50 even in a snowfall environment and a temperature environment below freezing point.

The other side of the two contact lines 46 (contact line 46-2) may face the back surface 57 of the second heat insulating material 22-1 in the first direction (Y-axis direction). The contact line 46-1 may face the back surface 12 of the first heater 10 in the first direction (Y-axis direction). As a result, the stress in the first direction (Y-axis direction) from the holding portion 40-1 is applied between the positions P1 and P5 in the first heat transfer plate 60 and between the positions P5 and P2. Will be done. As a result, the adhesion between the front surface 61 of the first heat transfer plate 60 and the back surface 52 (see FIG. 3) of the glass plate 50 (see FIG. 3) is likely to be improved between the positions P1 and P2. Become. Therefore, the heat from the first heater 10 is likely to propagate between the positions P1 and P2 on the glass plate 50.

The other of the two contact lines 47 (contact line 47-2) may face the back surface 59 of the second heat insulating material 22-2 in the first direction (Y-axis direction). The contact line 47-1 may face the back surface 16 of the second heater 14 in the first direction (Y-axis direction). As a result, the stress in the first direction (Y-axis direction) from the holding portion 40-2 is applied between the positions P3 and P6 in the second heat transfer plate 62 and between the positions P6 and P4. Will be done. As a result, the adhesion between the front surface 64 of the second heat transfer plate 62 and the back surface 52 (see FIG. 3) of the glass plate 50 (see FIG. 3) is likely to be improved between the positions P3 and P4. Become. Therefore, the heat from the second heater 14 is likely to propagate between the positions P3 and P4 on the glass plate 50.

The pressing portion 40-1 may be in contact with a part of the front surface 76 of the fifth heat insulating material 24-1. The pressing portion 40-1 may be in line contact with a part of the front surface 76 of the fifth heat insulating material 24-1. The pressing portion 40-2 may be in contact with a part of the front surface 78 of the fifth heat insulating material 24-2. The pressing portion 40-2 may be in line contact with a part of the front surface 78 of the fifth heat insulating material 24-2. In this example, the contact line 48 between the pressing portion 40-1 and a part of the front surface 76 and the contact line 49 between the pressing portion 40-2 and a part of the front surface 78 are in the third direction ( It extends in the Z-axis direction).

In the vehicle detection heater device 100 of this example, the holding portion 40-1 is in line contact with a part of the front surface 76 of the fifth heat insulating material 24-1, so that the holding portion 40-1 is mainly used. The heat propagated from the first heater 10 to the pressing portion 40-1 is less likely to propagate to the supporting portion 30-1 than in the case where the surface is in surface contact with a part of the surface 76. Therefore, the heat of the first heater 10 is more from the front surface 11 of the first heater 10 to the glass plate 50 (than when the pressing portion 40-1 is in surface contact with a part of the front surface 76. It becomes easier to propagate in the direction (see FIG. 3).

The thermal resistance of the holding portion 40 may be larger than the thermal resistance of the supporting portion 30. When the thermal resistance of the holding portion 40 is larger than the thermal resistance of the supporting portion 30, the heat propagated from the first heater 10 to the holding portion 40 is larger than when the thermal resistance of the holding portion 40 is smaller than the thermal resistance of the supporting portion 30. However, it is difficult to propagate to the support portion 30. Therefore, the heat of the first heater 10 tends to propagate from the front surface 11 of the first heater 10 toward the glass plate 50 (see FIG. 3).

The Young's modulus of the holding portion 40 may be larger than the Young's modulus of the first heat insulating material 20. When the Young's modulus of the holding portion 40 is larger than the Young's modulus of the first heat insulating material 20, the Young's modulus of the holding portion 40 is smaller than the Young's modulus of the first heat insulating material 20, the first heater 10 and the first transmission. The adhesion to the heat plate 60 and the adhesion between the first heat transfer plate 60 and the glass plate 50 (see FIG. 3) are likely to be improved. Therefore, the heat of the first heater 10 tends to propagate from the front surface 11 of the first heater 10 toward the glass plate 50 (see FIG. 3).

The Young's modulus of the holding portion 40 may be smaller than the Young's modulus of the first heat insulating material 20. When the Young's modulus of the holding portion 40 is smaller than the Young's modulus of the first heat insulating material 20, the first heat insulating material 20 is deformed more than when the Young's modulus of the holding portion 40 is larger than the Young's modulus of the first heat insulating material 20. It becomes difficult. Therefore, the stress from the holding portion 40 is evenly distributed in the XZ plane on the front surface 61 of the first heat transfer plate 60 and the back surface 52 (see FIG. 3) of the glass plate 50 (see FIG. 3). It becomes easy to apply. Therefore, the heat of the first heater 10 tends to be evenly propagated in the XZ plane from the front surface 11 of the first heater 10 toward the glass plate 50 (see FIG. 3).

The bulk modulus of the holding portion 40 may be smaller than the bulk modulus of the first heat insulating material 20. When the bulk modulus of the holding portion 40 is smaller than the bulk modulus of the first heat insulating material 20, the first direction of the holding portion 40 when the stress from the holding portion 40 is applied in the first direction (Y-axis direction). The amount of deformation in the (Y-axis direction) is larger than the amount of deformation in the first direction (Y-axis direction) of the first heat insulating material 20. Therefore, the stress from the holding portion 40 is evenly distributed in the XZ plane on the front surface 61 of the first heat transfer plate 60 and the back surface 52 (see FIG. 3) of the glass plate 50 (see FIG. 3). It becomes easy to apply.

FIG. 5 is a diagram showing a vehicle detection device 200 of a comparative example. In the vehicle detection device 200, the widths of the first heat transfer plate 160 and the second heat transfer plate 162 in the second direction (X-axis direction) are the second directions (X-axis direction) of the first heater 10 and the second heater 14, respectively. Equal to the width of the direction). In the vehicle detection device 200, the width of the heat transfer material 166-1 and the heat transfer material 166-2 in the second direction (X-axis direction) is the second direction (X-axis direction) of the first heater 10 and the second heater 14, respectively. Equal to the width of the direction).

Further, in the vehicle detection device 200, in the second direction (X-axis direction), the positions of both ends of the first heat transfer plate 160 and the heat transfer material 166-1 are equal to the positions of both ends of the first heater 10, and the second. The positions of both ends of the heat transfer plate 162 and the heat transfer material 166-2 are equal to the positions of both ends of the second heater 14. Further, in the vehicle detection device 200, the thickness of the second heat insulating material 122 in the first direction (Y-axis direction) is equal to the sum of the thickness Th (see FIG. 4) and the thickness Tr (see FIG. 4). ..

The vehicle detection device 200 is different from the vehicle detection device 300 shown in FIG. 3 in the above points. In other words, in the vehicle detection device 300, the first heat transfer plate 160 and the heat transfer material 166-1 do not extend in the second direction (X-axis direction) and are second in the first direction (Y-axis direction). The heat insulating material 122-1 is provided between the front surface 21 of the first heat insulating material 20-1 and the back surface 52 of the glass plate 50. Further, in the vehicle detection device 200, the second heat transfer plate 162 and the heat transfer material 166-2 do not extend in the second direction (X-axis direction), and the second heat insulation is performed in the first direction (Y-axis direction). The material 122-2 is provided between the front surface 41 of the first heat insulating material 20-3 and the back surface 52 of the glass plate 50.

The vehicle detection device 200 is, for example, an ETC vehicle detection device. When the ETC vehicle detection device is installed in a cold region, in the vehicle detection device 200, the first heat transfer plate 160, the second heat transfer plate 162, and the heat transfer material 166 extend in the second direction (X-axis direction). Therefore, the snow 120 that has fallen easily adheres to the region of the front surface 51 of the glass plate 50 that faces the second heat insulating material 122 in the first direction (Y-axis direction).

In FIG. 5, step (a) is a diagram schematically showing the snow 120 on the front surface 51 at the stage when the snow 120 starts to adhere to the front surface 51 of the glass plate 50. When the vehicle detection device 200 is installed in a cold region, when the snow 120 starts to adhere to the front surface 51, the snow 120 freezes, and the snow 120 is more likely to adhere starting from the frozen snow 120. Step (b) in FIG. 5 schematically shows a case where snow 120 is further attached to snow 120 in step (a).

When the snow 120 further adheres to the snow 120 in the step (b) of FIG. 5, the snow 120-1 and the snow 120-2 attached with the window portion 54 sandwiched in the second direction (X-axis direction) are attached to the window portion 54. And may be connected at a position facing the first direction (Y-axis direction). Step (c) in FIG. 5 schematically shows a case where the snow 120-1 and the snow 120-2 in the step (b) are connected in this way. When the snow 120-1 and the snow 120-2 are connected in this way, the optical path of the light irradiated from the light source 90 and passing through the window portion 54 is blocked by the snow 120.

Returning to FIG. 4, in the vehicle detection heater device 100, the first heat transfer plate 60, the second heat transfer plate 62, and the heat transfer material 66 are extended in the second direction (X-axis direction). Therefore, returning to FIG. 3, the snowfall 120 is unlikely to adhere to the region of the front surface 51 of the glass plate 50 facing the second heat insulating material 22 in the first direction (Y-axis direction). Therefore, in the vehicle detection heater device 100, the optical path of the light emitted from the light source 90 and passing through the window portion 54 is difficult to be blocked by the snow 120.

FIG. 6 is a diagram showing an example of the vehicle detection device 300 according to one embodiment of the present invention. FIG. 6 omits the glass plate 50 in FIG. In FIG. 6, the position of the glass plate 50 in the XZ plane is indicated by a thick broken line.

The fixing plate 70 of this example has an opening 69. The opening 69 penetrates from the front surface to the back surface of the fixing plate 70. In FIG. 6, the outer edge of the opening 69 on the XZ plane is shown by a thick line. The glass plate 50 may be provided so as to include the opening 69 when viewed from the first direction (Y-axis direction).

In the XZ cross section, the first heater 10 and the second heater 14 may be provided inside the opening 69. In FIG. 6, the first heater 10 and the second heater 14 are shown by hatching inside the opening 69. The first heater 10 and the second heater 14 of this example extend in the third direction (Z-axis direction).

In the XZ cross section, the first heat transfer plate 60 and the second heat transfer plate 62 may be provided inside the opening 69. The first heat transfer plate 60 and the second heat transfer plate 62 of this example are extended in the third direction (Z-axis direction).

In the third direction (Z-axis direction), the positions of one end and the other end of the opening 69 are defined as the position S1 and the position S2, respectively. In the present specification, the position S1 side in the third direction (Z-axis direction) is referred to as "up", and the position S2 side is referred to as "down". In the third direction (Z-axis direction), the position of the lower end of the fixing plate 70 is defined as the position S3. In the third direction (Z-axis direction), the position of the lower end of the first heater 10 and the second heater 14 is defined as the position S4.

The vehicle detection heater device 100 may further include a third heater 18. In this example, the third heater 18 is provided inside the opening 69. In FIG. 6, the third heater 18 is hatched inside the opening 69. The third heater 18 may have a rectangular shape having a long side in the X-axis direction and a short side in the Z-axis direction in the XZ cross section. The positions of the two short sides in the second direction (X-axis direction) may be equal to the positions P5 and P6, respectively.

In the third direction (Z-axis direction), one end and the other end of the first heater 10 are referred to as an end H11 and an end H12, respectively. In the third direction (Z-axis direction), one end and the other end of the second heater 14 are referred to as an end H21 and an end H22, respectively. The positions of the end H11 and the end H21 in the third direction (Z-axis direction) may be equal to the position S1.

In the second direction (X-axis direction), one end and the other end of the third heater 18 are referred to as an end H31 and an end H32, respectively. In this example, the end portion H31 refers to the portion of one of the two long sides of the third heater 18 that is closest to the position P5. In this example, the end portion H32 refers to the portion of the long side that is closest to the position P6.

In the third direction (Z-axis direction), the positions of the end H31 and the end H32 may be equal to the position S4. The position of the other of the two long sides of the third heater 18 is defined as the position S5. The position S5 may be the lower end position of the third heater 18 in the vertical direction.

The end H12 may be connected to the end H31. The end H22 may be connected to the end H32. The first heater 10, the second heater 14, and the third heater 18 may be integrally formed. The first heater 10, the second heater 14, and the third heater 18 may be an integrally formed belt heater.

In the third direction (Z-axis direction), one end and the other end of the first heat transfer plate 60 are referred to as an end portion C11 and an end portion C12, respectively. In the third direction (Z-axis direction), one end and the other end of the second heat transfer plate 62 are referred to as an end portion C21 and an end portion C22, respectively. The positions of the end C11 and the end C21 in the Z-axis direction may be equal to the position S1.

The positions of the ends C12 and the ends C22 in the third direction (Z-axis direction) may be equal to the position S4. The position S4 may be the lower end position of the first heat transfer plate 60 and the second heat transfer plate 62 in the vertical direction. The first heat transfer plate 60 and the second heat transfer plate 62 of this example extend from the position S1 to the position S4 in the third direction (Z-axis direction).

The vehicle detection heater device 100 may further include a third heat transfer plate 67. In this example, the third heat transfer plate 67 is provided inside the opening 69.

The window portion 54 (see FIG. 3) of the glass plate 50 is a region from the position S1 to the position S4 in the third direction (Z-axis direction) and from the position P2 to the position P3 in the second direction (X-axis direction). It is an area. The third heat transfer plate 67 may be provided below the window portion 54.

The third heat transfer plate 67 may have a rectangular shape having a long side in the X-axis direction and a short side in the Z-axis direction in the XZ cross section. The positions of the two short sides in the X-axis direction may be equal to positions P1 and P4, respectively.

In the second direction (X-axis direction), one end and the other end of the third heat transfer plate 67 are referred to as an end portion C31 and an end portion C32, respectively. In this example, the end portion C31 refers to the portion of one of the two long sides of the third heat transfer plate 67 that is closest to the position P1. In this example, the end portion C32 refers to the portion of the long side that is closest to the position P4.

In the third direction (Z-axis direction), the positions of the end C31 and the end C32 in the third direction (Z-axis direction) may be equal to the position S4. The position of the other of the two long sides on the third heat transfer plate 67 is defined as the position S6. The position S6 may be the lower end position of the third heat transfer plate 67 in the vertical direction.

The end C12 may be connected to the end C31. The end C22 may be connected to the end C32. The first heat transfer plate 60, the second heat transfer plate 62, and the third heat transfer plate 67 may be integrally formed. On the back surface 52 side of the glass plate 50, the third heat insulating material 26 and the fourth heat insulating material 28 (see FIG. 3 above) may extend from the third direction (Z-axis direction) position S1 to the position S6.

In the third direction (Z-axis direction), the distance from the position S1 to the position S4 is defined as the distance L. In the third direction (Z-axis direction), the position separated by (1/3) L from the position S4 on the position S1 side is defined as the position S8, and the position separated from the position S8 on the position S1 side by (1/3) L is defined as the position S8. The position is S7. In the third direction (Z-axis direction), the distance between the position S7 and the position S1 is equal to (1/3) L. The position S7 and the position S8 will be described later.

On the back surface 52 (see FIG. 3) side of the glass plate 50, the holding portion 40, the first heat insulating material 20, the second heat insulating material 22 and the fifth heat insulating material 24 (see FIG. 3 above) are in the third direction (Z-axis direction). ) May be extended from position S1 to position S5, and may be extended from position S1 to position S6. The contact line 46-1 and the contact line 46-2 between the pressing portion 40-1 and the back surface 23 (see FIG. 4) of the first heat insulating material 20-2 may extend from the position S1 to the position S5, and may extend from the position S1 to the position S5. It may be extended from S1 to the position S6. The contact line 47-1 and the contact line 47-2 between the pressing portion 40-1 and the back surface 42 (see FIG. 4) of the first heat insulating material 20-4 may extend from the position S1 to the position S5, and may extend from the position S1 to the position S5. It may be extended from the position S6 to the position S6. In FIG. 6, the contact lines 46 (positions Q1 and Q2) and the contact lines 47 (positions Q3 and Q4) are shown by thin alternate long and short dash lines.

The contact lines 46-1 and the contact lines 46-2 may be aligned in the plane of the back surface 23 (see FIG. 4) of the first heat insulating material 20-2. The contact lines 46-1 and the contact lines 46-2 may be arranged in parallel with each other in the third direction (Z-axis direction), or may be arranged in non-parallel directions. The contact lines 46-1 and the contact lines 46-2 do not have to intersect between the positions S1 and S5 in the third direction (Z-axis direction), and may intersect.

The contact lines 47-1 and the contact lines 47.2 may be aligned in the plane of the back surface 42 (see FIG. 4) of the first heat insulating material 20-4. The contact lines 47-1 and the contact lines 47.2 may be arranged in parallel with each other in the third direction (Z-axis direction), or may be arranged in non-parallel directions. The contact lines 47-1 and the contact lines 47.2 do not have to intersect between the positions S1 and S5 in the third direction (Z-axis direction), and may intersect.

FIG. 7 is a diagram showing an example of a BB'cross section in FIG. The BB'cross section includes a first fixing portion 33-3, a first fixing portion 33-4, a second fixing portion 36-3, a second fixing portion 36-4, a glass plate 50, a fixing plate 70, and a fixing member 73. -3 and an XY cross section passing through the fixing member 73-4. In FIG. 7, the range of the vehicle detection heater device 100 is shown by a thick alternate long and short dash line frame.

The third heat transfer plate 67 may be provided from the second fixing portion 36-1 side to the second fixing portion 36-2 side of the window portion 54 (see FIG. 3) in the second direction (X-axis direction). The third heat transfer plate 67 of this example extends from the position P1 to the position P4 in the second direction (X-axis direction). In this example, the front surface 93 of the third heat transfer plate 67 is in contact with the back surface 52 of the glass plate 50 from the position P1 to the position P4 in the second direction (X-axis direction).

At least a part of the third heater 18 and at least a part of the third heat transfer plate 67 may face each other in the first direction (Y-axis direction). The third heater 18 may be provided from the second fixed portion 36-1 side to the second fixed portion 36-2 side of the window portion 54 (see FIG. 3) in the second direction (X-axis direction). The third heater 18 of this example extends from the position P5 to the position P6 in the second direction (X-axis direction). That is, in this example, the entire third heater 18 in the second direction (X-axis direction) and a part of the third heat transfer plate 67 in the second direction (X-axis direction) are in the first direction (Y-axis direction). (Direction) facing each other.

In this example, the front surface 94 of the third heater 18 is in contact with the back surface 95 of the third heat transfer plate 67 in the second direction (X-axis direction) from the position P5 to the position P6. The first heat insulating material 20-1 and the first heat insulating material 20-2, and the first heat insulating material 20-3 and the first heat insulating material 20 on the back surface 96 side of the third heater 18 and in the second direction (X-axis direction). Insulation material may not be provided in the region between -4 and -4, and heat insulating material may be provided.

A heat transfer material 66-3 may be provided on the front surface 51 of the glass plate 50. The heat transfer material 66-3 may be provided from the second fixing portion 36-1 side to the second fixing portion 36-2 side of the window portion 54 in the second direction (X-axis direction). The heat transfer plate 66-3 of this example extends from the position P1 to the position P4 in the second direction (X-axis direction). In this example, the heat transfer plate 66-3 is in contact with the front surface 51 of the glass plate 50 in the second direction (X-axis direction) from the position P1 to the position P4.

The thickness of the third heat transfer plate 67 in the first direction (Y-axis direction) is defined as the thickness Tr'. The thickness Tr'may be larger than the thickness Tr (see FIG. 4) in the first direction (Y-axis direction) of the first heat transfer plate 60 and the second heat transfer plate 62. When the vehicle detection device 300 is installed in a cold region, the air temperature on the position S3 side of the lower end of the fixing plate 70 in the vertical direction tends to be lower than the air temperature on the position S1 side. Further, in a snowfall environment, snow on the ground tends to come into contact with the position S3 side of the vehicle detection device 300.

In the vehicle detection heater device 100 of this example, the thickness Tr of the third heat transfer plate 67 is larger than the thickness Tr of the first heat transfer plate 60 and the second heat transfer plate 62, so that the vehicle detection heater The device 100 transfers the amount of heat propagated from the third heat transfer plate 67 to the front surface 51 of the glass plate 50 from the first heat transfer plate 60 and the second heat transfer plate 62 to the front surface 51 of the glass plate 50. It is easy to make it larger than the amount of heat that propagates. Therefore, in the vehicle detection device 300 of this example, even if snow adheres to the front surface 51 side of the glass plate 50 at the position of the third heater 18 in the third direction (Z-axis direction). The snow is easily melted by the heat from the third heater 18.

The thickness of the heat transfer material 66-3 in the first direction (Y-axis direction) is defined as the thickness Ts'. The thickness Ts'may be larger than the thickness Ts of the heat transfer material 66-1 and the heat transfer material 66-2 in the first direction (Y-axis direction). In the vehicle detection device 300 of this example, the thickness Ts'of the heat transfer material 66-3 is larger than the thickness Ts of the heat transfer material 66-1 and the heat transfer material 66-2. The amount of heat retained in the heat transfer material 66-3 is likely to be larger than the amount of heat retained in each of the heat transfer material 66-1 and the heat transfer material 66-2. Therefore, even if snow adheres to the front surface 51 side of the glass plate 50, the snow is likely to melt due to the heat from the third heater 18.

FIG. 8 is a diagram showing an example of the elapsed time dependence of the temperature difference Δt between the measured temperature and the ambient temperature at the positions S1, S4, S7, and S8 in FIG. In FIG. 8, the ambient temperature refers to the ambient temperature of the vehicle detection device 300. The ambient temperature may be the air temperature at the place where the vehicle detection device 300 is installed. The measurement point TpL, the measurement point TpR, and the measurement point TpC in FIG. 8 refer to the measurement point TpL, the measurement point TpR, and the measurement point TpC shown in FIG. 3, respectively.

FIG. 8 shows the relationship between the elapsed time and the temperature difference Δt when the first heater 10 and the second heater 14 are turned on and the temperature rise is started at the elapsed time of 0. The ambient temperature is constant between the elapsed time 0 and the elapsed time T. The temperature difference Δt at each measurement point increases with the elapsed time and then converges to a constant value at the elapsed time T.

FIG. 9 is a diagram showing an example of the relationship between the position of each measurement point in the third direction (Z-axis direction) and the equilibrium arrival temperature Δtc. The equilibrium reached temperature Δtc is the temperature difference Δt reached at the elapsed time T. As is clear from FIG. 9, according to the vehicle detection heater device 100 of this example, the temperature difference Δt is larger than 40 ° C. at any measurement position.

The vehicle detection device 300 may be installed in a cold region where the temperature reaches 30 ° C. below freezing point. In the vehicle detection device 300 of this example, since the temperature difference Δt is larger than 40 ° C., even when the vehicle detection device 300 is installed in a cold region of 30 ° C. below the freezing point, the vehicle detection device 300 measures each measurement. The temperature at points (position S1, position S4, position S7 and position S8) can be greater than 10 ° C. Therefore, in the vehicle detection device 300 of this example, even if snow adheres to the glass plate 50, the snow is likely to melt. Therefore, the vehicle detection device 300 of this example can easily detect a vehicle even in a snowfall environment and a temperature environment below freezing point.

FIG. 10 is a diagram showing another example of the vehicle detection heater device 100 according to one embodiment of the present invention. In the vehicle detection heater device 100 of this example, the shape of the holding portion 40 is different from the shape of the holding portion 40 in the example shown in FIG. The holding portion 40 of this example has a curved surface in the XY cross section. At least a part of the curved surface of the holding portion 40 may be in contact with the first heat insulating material 20 and the fifth heat insulating material 24.

The holding portion 40 may be a columnar shape having a third direction (Z-axis direction) as a central axis. When the holding portion 40 is columnar, the central axis may be parallel to the back surface 23 of the first heat insulating material 20.

The holding portion 40-1 of this example is in line contact with the back surface 23 of the first heat insulating material 20-2 and the front surface 76 of the fifth heat insulating material 24-1 at the position U1 in the second direction (X-axis direction). is doing. The in-plane contact line 86 of the back surface 23 and the in-plane contact line 88 of the front surface 76 may extend in the third direction (Z-axis direction).

The holding portion 40-2 of this example is in line contact with the back surface 42 of the first heat insulating material 20-4 and the front surface 78 of the fifth heat insulating material 24-2 at the position U2 in the second direction (X-axis direction). is doing. The in-plane contact line 87 of the back surface 42 and the in-plane contact line 89 of the front surface 78 may extend in the third direction (Z-axis direction).

FIG. 11 is a diagram showing another example of the vehicle detection heater device 100 according to one embodiment of the present invention. In the vehicle detection heater device 100 of this example, the shape of the holding portion 40 is different from the shape of the holding portion 40 in the example shown in FIG. The holding portion 40 of this example has a curved surface in the XY cross section. At least a part of the curved surface of the holding portion 40 may be in contact with the first heat insulating material 20 and the fifth heat insulating material 24.

The holding portion 40 of this example has a shape in which a part of each of two circles arranged in the second direction (X-axis direction) overlaps in the second direction (X-axis direction) in the XY cross section. The pressing portion 40 may be a rod-shaped member extending in the third direction (Z-axis direction).

The holding portion 40-1 of this example has a back surface 23 of the first heat insulating material 20-2 and a front surface 76 of the fifth heat insulating material 24-1 at positions U3 and U4 in the second direction (X-axis direction). Is in line contact with. The in-plane contact line 81 of the back surface 23 and the in-plane contact line 83 of the front surface 76 may extend in the third direction (Z-axis direction).

The contact line 81-1 and the contact line 84-1 may face the back surface 12 of the first heater 10 in the first direction (Y-axis direction). The contact line 81-2 and the contact line 84-2 do not have to face the back surface 12 of the first heater 10 in the first direction (X-axis direction). The contact line 81-2 and the contact line 84-2 may face the back surface 57 of the second heat insulating material 22-1 in the first direction (X-axis direction).

In the vehicle detection heater device 100 of this example, the contact line 81-1 and the contact line 84-1 face the back surface 12 of the first heater 10 in the first direction (Y-axis direction), and the contact line 81. -2 and the contact line 84-2 face the back surface 57 of the second heat insulating material 22-1. Therefore, the stress in the first direction (Y-axis direction) from the holding portion 40-1 is applied between the positions P5 and P2 in the first heat transfer plate 60 and between the positions P1 and P5. Will be done. Therefore, the pressing portion 40-1 is more likely to press the back surface 23 of the first heat insulating material 20 evenly in the first direction (Y-axis direction) than when the contact line 84 is one. As a result, the adhesion between the front surface 61 of the first heat transfer plate 60 and the back surface 52 (see FIG. 3) of the glass plate 50 (see FIG. 3) is likely to be improved between the positions P1 and P2. Become. Therefore, the heat from the first heater 10 is likely to propagate between the positions P1 and P2 on the glass plate 50.

The holding portion 40-2 of this example has a back surface 42 of the first heat insulating material 20-4 and a front surface 78 of the fifth heat insulating material 24-2 at positions U5 and U6 in the second direction (X-axis direction). Is in line contact with. The in-plane contact line 83 of the back surface 42 and the in-plane contact line 85 of the front surface 78 may extend in the third direction (Z-axis direction).

The contact line 83-1 and the contact line 85-1 may face the back surface 16 of the second heater 14 in the first direction (Y-axis direction). The contact line 83-2 and the contact line 85-2 do not have to face the back surface 16 of the second heater 14 in the first direction (X-axis direction). The contact line 83-2 and the contact line 85-2 may face the back surface 59 of the second heat insulating material 22-2 in the first direction (X-axis direction).

In the vehicle detection heater device 100 of this example, the contact line 83-1 and the contact line 85-1 face the back surface 16 of the second heater 14 in the first direction (Y-axis direction), and the contact line 83. -2 and the contact line 85-2 face the back surface 59 of the second heat insulating material 22-2. Therefore, the stress in the first direction (Y-axis direction) from the holding portion 40-2 is applied between the positions P3 and P6 in the second heat transfer plate 62 and between the positions P6 and P4. Will be done. As a result, the adhesion between the front surface 64 of the second heat transfer plate 62 and the back surface 52 (see FIG. 3) of the glass plate 50 (see FIG. 3) is likely to be improved between the positions P3 and P4. Become. Therefore, the heat from the second heater 14 is likely to propagate between the positions P3 and P4 on the glass plate 50.

In the vehicle detection heater device 100 shown in FIGS. 10 and 11, the pressing portion 40-1 is in line contact with a part of the back surface 23 and is in line contact with the front surface 76. Therefore, the pressing portion 40-1 and a part of the back surface 23 are in surface contact with each other, and the front surface 76 is in surface contact with the front surface 76. The heat dissipation of the first heater 10 can be suppressed. Therefore, in the vehicle detection heater device 100 of this example, the heat of the first heater 10 tends to propagate from the front surface 11 of the first heater 10 toward the glass plate 50 (see FIG. 3).

In the vehicle detection heater device 100 shown in FIGS. 10 and 11, the pressing portion 40-2 is in line contact with a part of the back surface 42 and is in line contact with the front surface 78. Therefore, the pressing portion 40-1 and a part of the back surface 42 are in surface contact with each other, and the front surface 78 is in surface contact with the other, so that the back surface 16 of the second heater is in surface contact with the support portion 30. The heat dissipation of the second heater 14 can be suppressed. Therefore, in the vehicle detection heater device 100 of this example, the heat of the second heater 14 tends to propagate from the front surface 15 of the second heater 14 toward the glass plate 50 (see FIG. 3).

Although the present invention has been described above using the embodiments, the technical scope of the present invention is not limited to the scope described in the above embodiments. It will be apparent to those skilled in the art that various changes or improvements can be made to the above embodiments. It is clear from the description of the claims that the form with such changes or improvements may be included in the technical scope of the present invention.

The order of execution of each process such as operation, procedure, step, and step in the apparatus, system, program, and method shown in the claims, specification, and drawings is particularly "before" and "prior to". It should be noted that it can be realized in any order unless the output of the previous process is used in the subsequent process. Even if the scope of claims, the specification, and the operation flow in the drawings are explained using "first", "next", etc. for convenience, it means that it is essential to carry out in this order. It's not a thing.

10 ... 1st heater, 11 ... front side, 12 ... back side, 14 ... second heater, 15 ... front side, 16 ... back side, 18 ... 3rd heater, 20 ... 1st heat insulating material, 21 ... front surface, 22 ... 2nd heat insulating material, 23 ... back surface, 24 ... 5th heat insulating material, 26 ... 3rd heat insulating material, 28 ... 4th heat insulating material, 30 ... Support part, 31 ... Stretched part, 32 ... Stretched part, 33 ... 1st fixed part, 34 ... Stretched part , 35 ... Stretched portion, 36 ... Second fixed portion, 37 ... Stretched portion, 38 ... Stretched portion, 39 ... Stretched portion, 40 ... Pressing portion, 41 ... Front surface, 42 ... back surface, 46 ... contact line, 47 ... contact line, 48 ... contact line, 49 ... contact line, 50 ... glass plate, 51 ... Front side, 52 ... back side, 54 ... window part, 56 ... front side, 57 ... back side, 58 ... front side, 59 ... back side, 60 ... 1st heat transfer plate, 61 ... front surface, 62 ... 2nd heat transfer plate, 63 ... back surface, 64 ... front surface, 65 ... back surface, 66 ... -Heat transfer material, 67 ... 3rd heat transfer plate, 69 ... opening, 70 ... fixing plate, 72 ... fixing member, 73 ... fixing member, 74 ... fixing member, 76 ... front surface, 77 ... back surface, 78 ... front surface, 79 ... back surface, 80 ... space, 81 ... contact line, 82 ... space, 83. Contact line, 84 ... Contact line, 85 ... Contact line, 86 ... Contact line, 87 ... Contact line, 88 ... Contact line, 89 ... Contact line, 90 ... Light source, 91 ... space, 92 ... optical axis, 93 ... front surface, 94 ... front surface, 95 ... back surface, 96 ... back surface, 97 ... Space, 98 ... light beam, 100 ... vehicle detection heater device, 120 ... snow, 122 ... second heat insulating material, 160 ... first heat transfer plate, 162 ... second transfer Heat plate, 166 ... Heat transfer material, 200 ... Vehicle detection device, 300 ... Vehicle detection device, 400 ... High place, 402 ... Road

Claims (20)

With the first heater
The first heat insulating material provided on the back surface of the first heater and
A support portion provided on the back surface side of the first heat insulating material and arranged apart from the first heat insulating material in the first direction from the first heater toward the first heat insulating material.
A holding portion provided in the space between the back surface of the first heat insulating material and the supporting portion, and
Equipped with
The holding portion is in contact with a part of the back surface of the first heat insulating material and is in contact with a part of the supporting portion.
Vehicle detection heater device. The vehicle detection heater device according to claim 1, wherein the holding portion is in line contact with a part of the back surface of the first heat insulating material. In the second direction intersecting the first direction, the holding portion is in line contact at two points on the back surface of the first heat insulating material.
The vehicle detection heater device according to claim 2, wherein two contact lines in which the holding portion is in line contact are arranged in the surface of the back surface of the first heat insulating material. The vehicle detection heater device according to claim 3, wherein one of the two contact lines faces the back surface of the first heater in the first direction. Further equipped with a first heat transfer plate,
A glass plate is provided on the front surface side of the first heater.
The first heat transfer plate is provided between the front surface of the first heater and the back surface of the glass plate.
The vehicle detection heater device according to claim 4. A second heat insulating material arranged side by side with the first heater is further provided in the second direction.
The first heat insulating material and the first heat transfer plate are stretched in the second direction.
The second heat insulating material is provided between the front surface of the first heat insulating material and the back surface of the first heat transfer plate in the first direction.
The vehicle detection heater device according to claim 5. The vehicle detection heater device according to claim 6, wherein the other of the two contact lines faces the back surface of the second heat insulating material in the first direction. A second heater arranged side by side with the first heater in the second direction is further provided.
In the second direction, the second heat insulating material and the second heater are arranged on one side and the other side of the first heater, respectively.
In the second direction, the second heater is disposed away from the first heater.
The vehicle detection heater device according to claim 6 or 7. With a second heat transfer plate
The second heat transfer plate is provided between the front surface of the second heater and the back surface of the glass plate.
The vehicle detection heater device according to claim 8. Further equipped with a third heater and a third heat transfer plate,
The first heater and the second heater extend in a third direction that intersects the first direction and intersects the second direction.
One end of the first heater in the third direction is connected to one end of the third heater.
One end of the second heater in the third direction is connected to the other end of the third heater.
The first heat transfer plate and the second heat transfer plate are stretched in the third direction.
One end of the first heat transfer plate in the third direction is connected to one side of the third heat transfer plate in the second direction.
One end of the second heat transfer plate in the third direction is connected to the other side of the third heat transfer plate in the second direction.
At least a part of the third heater and at least a part of the third heat transfer plate face each other in the first direction.
The vehicle detection heater device according to claim 9. The thickness of the third heat transfer plate in the first direction is larger than the thickness of the first heat transfer plate in the first direction, and is larger than the thickness of the second heat transfer plate in the first direction. The large vehicle detection heater device according to claim 10. Claim that at least a part of the back surface of the glass plate is in contact with the space between the first heater and the second heater between the first heater and the second heater in the second direction. Item 6. The vehicle detection heater device according to any one of Items 8 to 11. The vehicle detection heater device according to any one of claims 5 to 12, wherein a heat transfer material is provided on the front surface of the glass plate. Further, in the first direction, a third heat insulating material provided between the holding portion and the supporting portion is further provided.
The holding portion is in contact with a part of the front surface of the third heat insulating material.
The vehicle detection heater device according to any one of claims 4 to 13. The vehicle detection heater device according to any one of claims 1 to 14, wherein the thermal resistance of the holding portion is larger than the thermal resistance of the supporting portion. The vehicle detection heater device according to any one of claims 1 to 15, wherein the Young's modulus of the holding portion is larger than the Young's modulus of the first heat insulating material. The vehicle detection heater device according to any one of claims 1 to 15, wherein the Young's modulus of the holding portion is smaller than the Young's modulus of the first heat insulating material. The vehicle detection heater device according to any one of claims 1 to 17, wherein the bulk modulus of the holding portion is smaller than the bulk modulus of the first heat insulating material. The holding portion has a curved surface and has a curved surface.
At least a part of the curved surface of the holding portion is in contact with the back surface of the first heat insulating material.
The vehicle detection heater device according to any one of claims 1 to 18. The holding portion is cylindrical and has a columnar shape.
The central axis of the columnar holding portion is parallel to the back surface of the first heat insulating material.
The vehicle detection heater device according to claim 1 or 2.

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