WO2021049479A1

WO2021049479A1 - Screen heater system

Info

Publication number: WO2021049479A1
Application number: PCT/JP2020/033920
Authority: WO
Inventors: 利和永井; 弘人大高
Original assignee: 株式会社クラベ
Priority date: 2019-09-09
Filing date: 2020-09-08
Publication date: 2021-03-18
Also published as: JP2021044097A; JP7461121B2

Abstract

A screen heater system according to the present invention comprises: a heater element (21) that is attached to a sensor bracket to which a sensor (17) is attached; and a heating control circuit that controls a heating state of the sensor element (21). The sensor bracket includes a sensor detection range groove (10) for providing a space in a sensor detection range necessary for the sensor (17) to detect an external environment. The heat element (21) is attached to the sensor bracket such that, in at least a part of a sensor detection range groove bottom plate (11) and sensor bracket faces (13)-(16), an amount of heat released at a part of a region constituting a detection range screen (20), in a screen (18), belonging to the sensor detection range or to at least of a part of an area around the detection range screen (20) is locally greater than at the remaining region in the detection range screen (20).

Description

Screen heater system

The present invention relates to a screen heater system, for example, a screen heater system that heats a screen by the amount of heat released to the screen covering the sensor.

Systems using heaters have been proposed in various fields. One of the application examples of the heater is to remove the fogging of the screen (for example, the front window) provided in front of the headlight camera provided in the front window of the automobile. Examples of such a heater system are disclosed in Patent Documents 1 and 2.

The window glass provided with the heatable light transmission sensor array described in Patent Document 1 is a window glass provided with a heatable light transmission sensor array, and a) the window glass and b) at least on the surface of the window glass. One light-transmitting sensor array and c) at least one heatable film attached as a self-adhesive film or with a light-transmitting adhesive on the light-transmitting sensor array, at least c1. A support film containing polybutylene terephthalate, polycarbonate, polyethylene terephthalate, polyethylene naphthalate, polyvinyl butyral, and / or polyethylvinyl acetate, mixtures thereof, block polymers, and / or copolymers, and c2. At least one heatable film, including a heatable coating, a printed conductor, a mesh, and / or a heating wire on a support film, and d) at least one electrical contact mounted on the heatable coating and / or the heating wire. Means include at least e) a capsule encapsulation mounted on a light transmissive sensor array or on a heatable membrane, and a sensor mounted within the capsule encapsulation.

The vehicle anti-fog deicing device described in Patent Document 2 is provided on a vehicle windshield, a first heat generating portion provided on the windshield and generating heat by energization, and a thickness of the windshield provided on the windshield. A second heat generating portion, which is arranged on the indoor side of the vehicle with respect to the first heat generating portion in the vertical direction and is provided on the windshield to generate heat by energization, and the first heat generating portion in the thickness direction of the windshield. The heat insulating portion arranged between the heat generating portion and the second heat generating portion, switching between the energized state and the non-energized state of the first heat generating portion, and the energized state and the non-energized state of the second heat generating portion. It is necessary to have a switching means capable of switching to the state individually for the first heat generating portion and the second heat generating portion, and to eliminate the poor visibility via the windshield provided in the vehicle. A resolution request switch means that is operated at the time and is set to an ON state that is a status of a demand for resolution of poor visibility, and a cloud detection means that detects the presence or absence of cloudiness on the inner surface of the windshield on the indoor side. When the elimination request switching means is in the ON state, the switching means includes an energized state and a non-energized state of the first heat generating portion and the second heat generating portion according to the detection result of the fogging detecting means. It is a control means that performs switching control with the state, and the control means is said to be the first when the fogging detecting means detects fogging on the inner surface when the elimination request switching means is in the on state. 2 When the heat generating portion is set to the energized state and the fogging detecting means does not detect the fogging of the inner surface, the first heat generating portion is set to the energized state and the second heat generating portion is set to the non-energized state. It is characterized by setting.

Japanese Patent No. 5753164 Japanese Patent No. 6439471

However, the heaters described in Patent Documents 1 and 2 are attached to the screen covering the front surface of the sensor, and there is a problem that the visibility in the sensor detection direction may be obstructed depending on the type of the sensor.

One aspect of the screen heater system of the present invention includes a heater element attached to a sensor bracket that attaches a sensor that detects an external environment via a screen, and a heating control circuit that controls a heating state of the heater element. The sensor bracket has a sensor detection range groove for providing a space in the sensor detection range required for the sensor to detect the external environment, and the heater element is a surface of the surface forming the sensor detection range groove. At least a part of the sensor detection range groove bottom plate facing the screen and the sensor bracket surface having a surface facing the screen around the sensor detection range groove belongs to the sensor detection range of the screen. The sensor bracket is provided so that the amount of heat released to at least a part around the detection range screen or a part of the area constituting the detection range screen is locally larger than the other areas of the detection range screen. It is attached.

According to the screen heater system according to the present invention, it is possible to realize deicing and antifogging of the screen without obstructing the field of view in the sensor detection direction.

FIG. 5 is a schematic view of a sensor bracket to which the screen heater system according to the first embodiment is applied. It is sectional drawing in the state which attached the sensor bracket to the screen for demonstrating the arrangement of the heater element of the screen heater system which concerns on Embodiment 1. FIG. It is a figure explaining the shape of the heater element of the screen heater system which concerns on Embodiment 1. FIG. It is a block diagram of the heater control device which controls the heater element of the screen heater system which concerns on Embodiment 1. FIG. It is a figure explaining the 1st form example of the heater element of the screen heater system which concerns on Embodiment 2. FIG. It is a figure explaining the 2nd shape example of the heater element of the screen heater system which concerns on Embodiment 2. FIG. It is a figure explaining the heating wire pattern for adjusting the heat quantity of a heater element. It is a figure explaining the 1st form example of the heater element of the screen heater system which concerns on Embodiment 3. FIG. It is a figure explaining the 2nd shape example of the heater element of the screen heater system which concerns on Embodiment 3. FIG. It is a figure explaining the shape example of the heater element of the screen heater system which concerns on Embodiment 4. FIG. FIG. 5 is a schematic view of a sensor bracket to which the screen heater system according to the fifth embodiment is applied. It is sectional drawing in the state which attached the sensor bracket to the screen for demonstrating the 1st arrangement example of the heater element of the screen heater system which concerns on Embodiment 5. It is sectional drawing in the state which attached the sensor bracket to the screen for demonstrating the 2nd arrangement example of the heater element of the screen heater system which concerns on Embodiment 5. It is sectional drawing in the state which attached the sensor bracket to the screen for demonstrating the 3rd arrangement example of the heater element of the screen heater system which concerns on Embodiment 5. It is the schematic of the sensor bracket for demonstrating the arrangement of the heater element of the screen heater system which concerns on Embodiment 6. It is a figure explaining the shape example of the heater element of the screen heater system which concerns on Embodiment 7. It is a figure explaining the shape example of the heater element of the screen heater system which concerns on Embodiment 8.

Embodiment 1
In order to clarify the explanation, the following description and drawings have been omitted or simplified as appropriate. In addition, each element described in the drawing as a functional block that performs various processing can be composed of a CPU (Central Processing Unit), a memory, and other circuits in terms of hardware, and a memory in terms of software. It is realized by the program loaded in. Therefore, it is understood by those skilled in the art that these functional blocks can be realized in various forms by hardware only, software only, or a combination thereof, and is not limited to any of them. In each drawing, the same elements are designated by the same reference numerals, and duplicate explanations are omitted as necessary.

In addition, the above-mentioned programs can be stored and supplied to a computer using various types of non-transitory computer readable media. Non-temporary computer-readable media include various types of tangible storage media. Examples of non-temporary computer-readable media include magnetic recording media (eg, flexible disks, magnetic tapes, hard disk drives), magneto-optical recording media (eg, magneto-optical disks), CD-ROMs (Read Only Memory) CD-Rs, CDs. -R / W, including semiconductor memory (for example, mask ROM, PROM (Programmable ROM), EPROM (Erasable PROM), flash ROM, RAM (RandomAccessMemory)). The program may also be supplied to the computer by various types of temporary computer readable media. Examples of temporary computer-readable media include electrical, optical, and electromagnetic waves. The temporary computer-readable medium can supply the program to the computer via a wired communication path such as an electric wire and an optical fiber, or a wireless communication path.

In the embodiment described below, an optical camera that acquires an image of the environment beyond the sensor detection range is used as the sensor to be used. However, the sensor is not limited to an optical camera, and various sensors such as a radar and an infrared sensor can be used. In addition, the sensor and screen heater system shall be mounted on the windscreen located at the front of the vehicle.

First, FIG. 1 shows a schematic view of a sensor bracket 1 to which the screen heater system according to the first embodiment is applied. The sensor bracket 1 shown in FIG. 1 shows only a portion of the bracket having various other parts to which the sensor and the screen heater system according to the first embodiment are attached.

As shown in FIG. 1, the sensor bracket 1 is provided with a sensor hole 12 in which the lens of the camera is exposed at the back of the sensor detection range groove 10 provided on the bracket (the surface located on the upper side in the mounted state). .. Further, among the surfaces of the sensor detection range groove 10, the surface at a position opposite to the windscreen is designated as the sensor detection range groove bottom plate 11. Further, the sensor bracket 1 has a portion formed so as to surround the sensor detection range groove 10. In the example shown in FIG. 1, the portions formed so as to surround the sensor detection range groove 10 are the sensor lower outer peripheral bracket surface 13, the sensor upper outer peripheral bracket surface 14, the sensor right outer peripheral bracket surface 15, and the sensor left outer peripheral bracket surface 16. ..

In the screen heater system according to the first embodiment, the heater element is attached to the sensor bracket 1 shown in FIG. Therefore, the mounting position of the heater element in the screen heater system according to the first embodiment will be described. FIG. 2 shows a cross-sectional view of the screen heater system according to the first embodiment in a state where the sensor bracket is attached to the screen for explaining the arrangement of the heater elements.

As shown in FIG. 2, in the screen heater system according to the first embodiment, the heater element 21 is attached to the back surface of the sensor detection range groove bottom plate 11 of the sensor bracket 1 which is not facing the windscreen 18. Further, as shown in FIG. 2, in the screen heater system according to the first embodiment, the heater element 21 is arranged so that the amount of heat on the side of the sensor detection range groove bottom plate 11 that is closer to the windscreen 18 is increased. To do. Further, as shown in FIG. 2, the heater element 21 is arranged so as to exclude the sensor detection range that is the shooting range of the camera 17.

In the screen heater system according to the first embodiment, the sensor detection range groove bottom plate 11 facing the screen (for example, a wind screen) and the sensor detection range groove 10 among the surfaces on which the heater element 21 constitutes the sensor detection range groove 10 It is provided on at least a part of a sensor bracket surface having a surface facing the windscreen in the periphery. The example shown in FIG. 2 is an example in which the heater element 21 is provided on a part of the sensor detection range groove bottom plate 11 facing the screen (for example, a wind screen) among the surfaces forming the sensor detection range groove 10.

Then, the amount of heat released by the heater element 21 to at least a part of the wind screen around the detection range screen 20 belonging to the sensor detection range or a part of the region constituting the detection range screen 20 is the detection range screen 20. It is attached to the sensor bracket so that it is locally larger than the other areas. In the example shown in FIG. 2, the heater element 21 is arranged so that the amount of heat released to a part of the region constituting the detection range screen 20 is locally larger than that of the other region of the detection range screen 20. Is.

Subsequently, the shape of the heater element 21 adopted in the sensor bracket 1 according to the first embodiment will be described. Therefore, FIG. 3 shows a diagram illustrating the shape of the heater element of the screen heater system according to the first embodiment. In FIG. 3, the region to be the sensor detection range groove bottom plate 11 is shown by a broken line.

As shown in FIG. 3, in the first embodiment, the heater element 21 is arranged in the region of the sensor detection range groove bottom plate 11 on the side where the distance from the wind screen 18 is short, and the distance from the wind screen 18 is long. The heater element 21 is not arranged in the side region. Further, the heater element 21 has a shape in which a heating wire 22 made of foil or wire such as SUS (stainless steel) or copper is sandwiched between resin films such as polyimide. Further, as the heater element 21, a PTC (Positive Temperature Coefficient) heater can be used. As shown in FIG. 3, in the heater element 21, the heating wire 22 is formed so as to be a single stroke in a region requiring heat generation.

Subsequently, in the screen heater system according to the first embodiment, the heater control device 2 that controls the heater element 21 will be described. Therefore, FIG. 4 shows a block diagram of the heater control device 2 that controls the heater element 21 of the screen heater system according to the first embodiment. As shown in FIG. 4, the heater control device 2 includes a battery 30, a regulator circuit 31, a step-down circuit 32, a temperature control circuit 33, and a thermostat 34.

The heater control device 2 lowers the battery voltage Vbat output from the battery 30 and supplies electric power to the heater element 21. The step-down circuit 32 steps down the battery voltage Vbat and outputs the internal power supply iPWR. The voltage of the internal power supply iPWR is a power supply voltage for operating the temperature control circuit 33. The temperature control circuit 33 realizes the operation of the heater control device 2 in terms of hardware, or executes a program that realizes the operation of the heater control device 2 in the arithmetic unit. Further, the thermostat 34 detects the temperature of the heater element 21. Then, the temperature control circuit 33 controls the regulator circuit 31 to the heater element 21 so that the difference value between the temperature information obtained from the thermostat 34 and the target temperature given by the host system (not shown) becomes zero. Change the power supplied.

From the above description, in the screen heater system according to the first embodiment, the amount of heat for a part of the detection range screen 20 is higher than that in the other regions. Thereby, in the screen heater system according to the first embodiment, for example, the lower portion of snow or ice adhering to the region of the detection range screen 20 on the outside of the windscreen is melted. By melting the lower part of the snow or ice in this way, the snow or ice adhering to the region of the detection range screen 20 can be slid off.

Further, in the screen heater system according to the first embodiment, a high amount of heat is applied to a part of the area where the snow or ice is desired to be removed to melt the snow or ice, so that the amount of heat is less than applying heat to the entire target area. Snow or ice can be removed with electricity.

Further, in the screen heater system according to the first embodiment, since the wind screen 18 is heated by the heater element 21, fogging of the detection range screen 20 can be removed.

Embodiment 2
In the second embodiment, another embodiment of the heater element 21 according to the first embodiment will be described. Therefore, FIG. 5 shows a diagram illustrating a heater element 21a which is a first form example of the screen heater system according to the second embodiment. Further, FIG. 6 shows a diagram illustrating a heater element 21b which is a second form example of the screen heater system according to the second embodiment.

As shown in FIGS. 5 and 6, in each of the

heater elements

21a and 21b according to the second embodiment, the heater elements are arranged on substantially the entire surface of the sensor detection range groove bottom plate 11. In each of the

heater elements

21a and 21b according to the second embodiment, a high radiant heat region is formed on the side where the distance from the windscreen 18 is short, and the low radiant heat is formed on the side where the distance from the windscreen 18 is long. A region is formed.

The wiring pattern of the heating wire 22 is different between the high radiant heat region and the low radiant heat region. The high radiant heat region has a higher amount of heat per unit area on the heater element than the low radiant heat region. Therefore, the relationship between the difference in the wiring pattern and the difference in the amount of heat will be described below.

FIG. 7 shows a diagram illustrating a heating wire pattern for adjusting the amount of heat of the heater element. In the example shown in FIG. 7, the line width of the heating wire in the high radiant heat region is W1, the pitch between the heating wires is P1, and the gap between the heat transfer wires is G1. Then, in the first example of the low radiant heat region shown in FIG. 7, the line width W2 of the heating wire is wider than the line width W1 of the heating wire in the high radiant heat region, and the pitch P2 of the heating wire is high radiation. It is set wider than the pitch P1 of the heating wire in the thermal region. On the other hand, in the first example of the low radiant heat region, the gap of the heating wire is the same as that of the high radiant heat region. In this way, by increasing the line width of the heating wire, the resistance value of the heating wire decreases, so that the amount of heat generated by the heating wire is suppressed. Further, by making the gaps between the heating wires the same, the amount of heat per unit area on the heater element can be reduced.

Further, in the second example of the low radiant heat region shown in FIG. 7, the gap G2 of the heating wire is wider than the gap G1 of the heating wire in the high radiant heat region, and the pitch P2 of the heating wire is the high radiant heat region. It is set wider than the pitch P1 of the heating wire of. On the other hand, in the second example of the low radiant heat region, the line width of the heating wire is the same as that of the high radiant heat region. In this way, by increasing the gap between the heating wires and making the line widths between the heating wires the same, it is possible to reduce the amount of heat per unit area on the heater element.

In the second embodiment, the heater element is arranged even in the region where the heater element is not arranged in the first embodiment. At this time, by reducing the amount of heat of the heater element in the region where the distance from the windscreen 18 is large, the antifogging ability is higher than that of the first embodiment, and the deicing ability is the same as that of the first embodiment. can do.

Embodiment 3
In the third embodiment, another embodiment of the heater element 21 according to the first embodiment will be described. Therefore, FIG. 8 shows a diagram illustrating a heater element 21c which is a first form example of the screen heater system according to the third embodiment. Further, FIG. 9 shows a diagram illustrating a heater element 21d, which is a second form example of the screen heater system according to the third embodiment.

As shown in FIGS. 8 and 9, in each of the

heater elements

21c and 21d according to the third embodiment, the heater elements are arranged on substantially the entire surface of the sensor detection range groove bottom plate 11. In each of the

heater elements

21c and 21d according to the third embodiment, a high radiant heat region is formed on both the side closer to the windscreen 18 and the side farther away from the windscreen 18, and the

heater elements

21c and 21d are sandwiched between the upper and lower two high radiant heat regions. A low radiant heat region is formed in the region.

The difference in the wiring pattern of the heating wire 22 between the high radiant heat region and the low radiant heat region is the same as the difference between the high radiant heat region and the low radiant heat region described in the second embodiment.

In the third embodiment, the heater element is arranged even in the region where the heater element is not arranged in the first embodiment. At this time, in the third embodiment, the amount of heat of the heater element in the region on the side where the distance from the windscreen 18 is the largest is made higher than that in the middle region of the heater element. As a result, in the third embodiment, the amount of heat to the upper side of the detection range screen 20 in which the amount of heat to the detection area screen decreases is increased. In the third embodiment, the deicing ability can be made the same as that of the first embodiment while increasing the antifogging ability as compared with the screen heater system according to the second embodiment.

Embodiment 4
In the fourth embodiment, another embodiment of the heater element 21 according to the first embodiment will be described. Therefore, FIG. 10 shows a diagram illustrating the heater element 21e of the screen heater system according to the fourth embodiment.

As shown in FIG. 10, in the heater element 21e according to the fourth embodiment, the heater element is arranged on substantially the entire surface of the sensor detection range groove bottom plate 11. Then, in the heater element 21e according to the fourth embodiment, many heating wires 22 are wired in the lower region where the distance from the windscreen 18 is short, and also in the region along the periphery of the sensor detection range groove bottom plate 11. The heating wire 22 is wired.

In the fourth embodiment, by adopting such a wiring pattern of the heating wire 22, a high amount of heat can be given to the outer periphery of the detection range screen 20 as well. Thereby, in the screen heater system according to the fourth embodiment, the ability to melt the ice or the like icing on the windscreen 18 from the outer peripheral portion of the detection range screen 20 and remove it from the detection range screen 20 can be enhanced.

Embodiment 5
In the fifth embodiment, another embodiment of the arrangement of the heater elements according to the first embodiment will be described. Therefore, FIG. 11 shows a schematic view of the sensor bracket 3 to which the screen heater system according to the fifth embodiment is applied.

As shown in FIG. 11, in the screen heater system according to the fifth embodiment, the heater element is arranged so as to surround the sensor detection range groove 10 on the bracket surface on the outer periphery of the sensor detection range groove 10 of the sensor bracket 3. Specifically, in the sensor bracket 3, the heater element 23 is arranged on the sensor lower outer peripheral bracket surface 13, the heater element 24 is arranged on the sensor upper outer peripheral bracket surface 14, and the heater element 25 is arranged on the sensor right outer peripheral bracket surface 15. The heater element 26 is arranged on the outer peripheral bracket surface 16 on the left side of the sensor.

In the sensor bracket 3, it is not necessary to arrange all of the heater elements 23 to 25. For example, only the heater element 23, only the heater element 24, and only the

heater elements

23 and 24 may be arranged. Therefore, FIGS. 12 to 14 show a cross section in a state where the sensor bracket is attached to the screen for explaining the first to third arrangement examples of the heater elements of the screen heater system according to the fifth embodiment. The figure is shown.

In the first arrangement example shown in FIG. 12, only the heater element 23 is arranged, in the second arrangement example shown in FIG. 13, only the heater element 24 is arranged, and in the third arrangement example shown in FIG. 14, the heater is arranged. Both

elements

23 and 24 are arranged. Then, as shown in FIGS. 12 to 14, in the sensor bracket 3, the heater elements 23 to 26 are arranged so as to be sandwiched between the bracket surface and the windscreen 18.

From the above description, in the screen heater system according to the fourth embodiment, the heater element is arranged so as to surround the sensor detection range groove 10, and the heat released is directly applied to the wind screen 18 while avoiding the detection range screen 20. Can be done. Thereby, in the screen heater system according to the fourth embodiment, the deicing ability of the detection range screen 20 can be increased as compared with the other embodiments.

Embodiment 6
In the sixth embodiment, an example of arranging the heater element with respect to the sensor bracket to which a plurality of sensors are attached will be described. Therefore, FIG. 15 shows a schematic view of the sensor bracket for explaining the arrangement of the heater elements of the screen heater system according to the sixth embodiment.

As shown in FIG. 15, in the sixth embodiment, the

cameras

17a and 17b are provided at distant positions on the sensor bracket. Then, in the sixth embodiment, the

heater elements

21f and 21g are provided in the sensor detection range groove bottom plate 11 at a position located in front of the

cameras

17a and 17b on the side where the distance from the windscreen 18 is closer. More specifically, the heater element 21f is provided corresponding to the camera 17a, and the heater element 21g is provided corresponding to the camera 17b.

From the above description, in the screen heater system according to the sixth embodiment, by providing heater elements for each sensor detection range of the plurality of sensors, the wind screen 18 is efficiently deiced and antifogging while reducing power consumption. It can be performed.

Embodiment 7
In the seventh embodiment, another embodiment of the heater element according to the first embodiment will be described. Therefore, FIG. 16 shows a diagram illustrating a shape example of the heater element 21h of the screen heater system according to the seventh embodiment.

The heater element 21h according to the seventh embodiment has a shape in which two heater elements are overlapped with each other in a portion corresponding to a high radiation region. In FIG. 16, in order to express that two heater elements are overlapped with each other, a state in which the two heater elements are shifted is shown. Specifically, the heater element 21h is a heater element 21i that covers the entire sensor detection range groove bottom plate 11 and the heater element 21j is superposed on the heater element 21i so as to be located at a portion corresponding to a high radiation region.

From the above description, the heater element 21h according to the seventh embodiment can form a region corresponding to the

heater elements

21c and 21d according to the second embodiment as a high radiation region and a low radiation region. Further, the heater element 21h according to the seventh embodiment is composed of two heater elements, and the two heater elements are individually controlled. When the deicing function is not required, for example, the heater element 21j Power consumption can be suppressed by setting the non-energized state.

Embodiment 8
In the eighth embodiment, another embodiment of the heater element according to the first embodiment will be described. Therefore, FIG. 17 shows a diagram illustrating a shape example of the heater element 21k of the screen heater system according to the eighth embodiment.

In the heater element 21k according to the eighth embodiment,

heating wires

22c and 22d are formed on one sheet by different paths. The heating wire 22c and the heating wire 22d are individually controlled for heat generation. Thereby, in the heater element 21k according to the eighth embodiment, for example, the target temperature of the heater composed of the heating wire 22c can be made higher than the target temperature of the heater composed of the heating wire 22d.

From the above description, the heater element 21k according to the eighth embodiment forms a region corresponding to the heater element 21e according to the fourth embodiment, and a heater exhibiting an antifogging function is combined with a blank region of the heater element 21e. A heater element can be configured. Further, the heater element 21k according to the eighth embodiment constitutes two heating wire paths to individually control the two heater elements, and when the deicing function is not required, for example, the heating wire 22c. The heater element formed by the above can be put into a non-energized state to suppress power consumption.

The present invention is not limited to the above embodiment, and can be appropriately modified without departing from the spirit.

This application claims priority based on Japanese application Japanese Patent Application No. 2019-163688 filed on September 9, 2019, and incorporates all of its disclosures herein.

1, 3 Sensor bracket 2 Heater control device 10 Sensor detection range groove 11 Sensor detection range groove Bottom plate 12 Sensor hole 13 Sensor lower outer peripheral bracket surface 14 Sensor upper outer peripheral bracket surface 15 Sensor right outer peripheral bracket surface 16 Sensor left outer peripheral bracket surface 17 Camera 18 Wind screen 20 Detection range screen 21 Heater element 22 Heating wire 23-26 Heater element 30 Battery 31 Regulator circuit 32 Step-down circuit 33 Temperature control circuit 34 Thermostat

Claims

A heater element attached to the sensor bracket that attaches a sensor that detects the external environment through the screen,
It has a heating control circuit that controls the heating state of the heater element.
The sensor bracket has a sensor detection range groove for providing a space in the sensor detection range required for the sensor to detect the external environment.
The heater element is
Of the surfaces constituting the sensor detection range groove, at least a part of a sensor detection range groove bottom plate facing the screen and a sensor bracket surface having a surface facing the screen around the sensor detection range groove.
The amount of heat released to at least a part of the screen around the detection range screen belonging to the sensor detection range or a part of the area constituting the detection range screen is more local than the other areas of the detection range screen. A screen heater system that is attached to the sensor bracket so as to be large.
The screen heater system according to claim 1, wherein the heater element is attached to a back surface of the sensor detection range groove bottom plate located on a side not facing the screen.
The screen heater system according to claim 1 or 2, wherein the heater element is arranged with a heating wire so that the amount of heat for the screen on the side of the bottom plate of the groove bottom plate of the sensor detection range that is close to the screen is large.
Any of claims 1 to 3 in which the heater element is set so that the line width and pitch of the heating wire in the portion having a large amount of heat with respect to the screen is smaller than the line width and pitch of the heating wire in the portion having a small amount of heat with respect to the screen. Or the screen heater system according to item 1.
The heater element is claimed so that the pitch of the heating wire in the portion having a large amount of heat with respect to the screen and the gap between the heating wires are set smaller than the pitch of the heating wire in the portion having a small amount of heat with respect to the screen and the gap between the heating wires. Item 2. The screen heater system according to any one of Items 1 to 3.
The heater element includes a first heater element and a second heater element, and a portion having a large amount of heat with respect to the screen is formed by superimposing the first heater element and the second heater element with respect to the screen. The screen heater system according to any one of claims 1 to 3, wherein only one of the first heater element and the second heater element is arranged in a portion having a small amount of heat.
The screen heater system according to any one of claims 1 to 6, wherein the sensor is an optical camera that acquires an image of an environment beyond the sensor detection range.