JP2018198143A - Heating device - Google Patents

Abstract

To provide a heating device capable of warming such that the temperature of a windshield in front of an imaging apparatus becomes uniform while a heating portion has a simple structure.SOLUTION: A heating device for warming a glass surface of a vehicle included in a photographing range of an imaging apparatus that photographs the outside of the vehicle includes: a body portion having an opening that opens in a photographing direction of the imaging apparatus; and a planar heating portion arranged on a side opposite to a side where there is the glass surface with respect to the body portion, uniformly heating in a plane, and supplying heat to the bottom of the body portion. The bottom of the body portion has a first region on a side close to the imaging apparatus and a second region on a side far from the imaging apparatus. The calorific value per unit area radiated via the first region in plan view is larger than the calorific value per unit area radiated via the second region in plan view.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a heat generating device.

  Currently, the number of vehicles equipped with image recording devices is increasing. Some image recording apparatuses for vehicles are attached to the windshield from inside the vehicle.

  In the image recording apparatus attached to the windshield from inside the vehicle, if the windshield in front of the photographing camera becomes clouded due to condensation or the like, the image of the photographing camera becomes unclear.

  Therefore, there is an image recording apparatus provided with a foil heater. The image recording apparatus warms the windshield in front of the photographing apparatus with a foil heater to prevent fogging, and performs photographing and image recording in front of the vehicle.

  In order to record a uniform image in an image recording apparatus, it is important to uniformly remove the fog on the windshield in front of the photographing apparatus. In order to uniformly remove the fog on the windshield in front of the photographing apparatus, it is important to uniformly warm the windshield in front of the photographing apparatus.

  In Patent Document 1, a foil heater is formed so that the heat radiation output for each unit area of two different surface areas or length areas is different, the heat radiation output of the foil heater far from the windshield is increased, and from the windshield. The heat radiation output of the near foil heater is made small. In this way, Patent Literature 1 reduces the temperature difference between the windshield portion that is far from the foil heater and the windshield portion that is near from the foil heater.

International Publication No. 2012/069115

  However, if the thickness and thickness of the heater wires are changed or the interval between the heater wires is changed in order to make the heat generation amount of the foil heater non-uniform, the structure of the foil heater becomes complicated and the cost increases.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a heat generating device capable of warming the temperature of the windshield in front of the photographing device to be uniform while making the heat generating portion a simple structure.

  The heat generating device of the present invention is a heat generating device that warms the glass surface of the vehicle included in the image capturing range of the image capturing device that captures the outside of the vehicle, and a main body having an opening that opens in the image capturing direction of the image capturing device. , Disposed on the side opposite to the side where the glass surface is present with respect to the main body, and includes a sheet-like heat generating portion that uniformly generates heat in the surface and supplies heat to the bottom of the main body, The bottom portion of the main body has a first region on the side closer to the imaging device and a second region on the side far from the imaging device, and is a plan view that radiates through the first region. The amount of heat per unit area at is greater than the amount of heat per unit area in plan view radiating through the second region.

  According to the present invention, it is possible to warm the temperature of the windshield in front of the photographing apparatus to be uniform while making the heat generating portion a simple structure.

It is a figure when the image recording apparatus carrying the heat generating apparatus which concerns on 1st Embodiment is attached to the vehicle. It is a perspective view of the heat generating device which an image recording device has. It is the perspective view which looked at the diffuser cover from the back side (vehicle inside of a vehicle). It is the figure which showed the heat generating part attached to the back side of the bottom part of a diffuser cover. It is AA arrow sectional drawing of FIG. It is AA arrow sectional drawing of FIG. It is AA arrow sectional drawing of FIG. 4 which concerns on 2nd Embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[First Embodiment]
FIG. 1 is a view when an image recording apparatus equipped with a heat generating apparatus according to the first embodiment is attached to a vehicle. FIG. 1 shows a vehicle 1 and an image recording device 2. FIG. 1 shows a part of the vehicle 1 in a perspective view from the front.

  The vehicle 1 has a windshield 1a. The image recording device 2 is attached to the windshield 1a from the inside of the vehicle 1.

  The image recording apparatus 2 includes a photographing camera and photographs the front of the vehicle 1. The image recording device 2 stores the image data taken by the photographing camera in a storage device such as an HDD (Hard Disk Drive).

  FIG. 2 is a perspective view of the heat generating device 10 included in the image recording apparatus 2. As shown in FIG. 2, the heating device 10 has a main body 11. The main body 11 is made of plastic, for example. As will be described later, the heat generating device 10 has a heat generating portion, and warms the windshield 1a included in the photographing range of a photographing camera that photographs the outside of the vehicle 1 (see, for example, the photographing camera 41 in FIG. 6). In addition, arrow A3 of FIG. 2 has shown the imaging | photography direction of the imaging camera fixed to the back part 16 mentioned later.

  The main body 11 has a fixed part 12, a bottom part 13, side parts 14 and 15, and a back part 16.

  The fixed part 12 has a planar shape. The fixing portion 12 is fixed to the windshield 1a from the inside of the vehicle 1 (see, for example, FIG. 6). The fixing part 12 is fixed to the windshield 1a with, for example, a double-sided tape.

  The bottom part 13 has a planar shape. The width of the bottom portion 13 indicated by the double-headed arrow A1 in FIG. 2 is formed so as to gradually increase as it goes in the direction of the arrowhead of the arrow A3. That is, the width of the bottom portion 13 is formed so as to gradually increase toward the shooting direction of the shooting camera.

  The side parts 14 and 15 have a planar shape. The side portions 14 and 15 extend from the bottom portion 13 toward the fixed portion 12. The heights of the side portions 14 and 15 indicated by the double-headed arrow A2 in FIG. 2 are formed so as to be gradually lowered in the direction of the arrow tip of the arrow A3. That is, the heights of the side portions 14 and 15 are formed so as to gradually decrease toward the shooting direction of the shooting camera.

  The back part 16 has a planar shape. The back portion 16 extends from the bottom portion 13 toward the fixed portion 12. The back portion 16 has an opening X1, and a lens portion of the photographing camera is inserted into the opening X1 (see, for example, FIG. 6).

  The main body 11 has a concave opening X <b> 2 surrounded by the bottom portion 13, the side portions 14 and 15, and the back portion 16. That is, the main body 11 has an opening X2 that opens in the shooting direction of the shooting camera.

  The bottom portion 13, the side portions 14 and 15, and the back portion 16 may be integrally formed and can be detached from the main body portion 11. The bottom 13, sides 14, 15 and back 16 are also referred to as a diffuse cover or hood. Below, the bottom part 13, the side parts 14 and 15, and the back part 16 are called a diffused cover. The diffuser cover suppresses the diffused light from the vehicle from entering the photographing camera.

  FIG. 3 is a perspective view of the diffuser cover 21 as viewed from the back side (the inside of the vehicle 1). In FIG. 3, the same components as those in FIG. As shown in FIG. 3, the diffuser cover 21 is formed by a bottom portion 13, side portions 14 and 15, and a back portion 16.

  A heat generating portion 31 is provided on the back side of the bottom portion 13 of the diffuser cover 21 as indicated by hatching. The heat generating portion 31 is, for example, a foil heater, and is attached to the back side of the bottom portion 13 of the diffuser cover 21 with a double-sided tape.

  FIG. 4 is a view showing the heat generating portion 31 attached to the back side of the bottom portion 13 of the diffuser cover 21. 4, the same components as those in FIG. 3 are denoted by the same reference numerals. An arrow A11 illustrated in FIG. 4 indicates the shooting direction of the shooting camera.

  The heat generating portion 31 (portion indicated by a dotted frame) is formed by, for example, a planar heating resistor. As shown in FIG. 4, the heater wire of the heat generating portion 31 is formed to meander.

  Further, the heat generating portion 31 is formed to have a constant width in the shooting direction of the shooting camera. For example, the heat generating portion 31 is formed to have a constant width as indicated by a double arrow A12 in FIG.

  The thickness and thickness of the heater wire of the heat generating portion 31 are formed uniformly. In addition, the heating portion 31 is formed with a uniform spacing between the heater wires. Therefore, the heat generation part 31 has a uniform amount of heat generation in the plane (within the dotted frame).

  Although not shown in FIG. 4, power is supplied to the heat generating unit 31 from the power supply unit. The heat generating part 31 generates heat by power supplied from the power supply part.

  5 is a cross-sectional view taken along the line AA in FIG. In FIG. 5, the same components as those in FIG. 4 are denoted by the same reference numerals.

  The bottom portion 13 has a first region on the side close to the photographing camera (see, for example, the photographing camera 41 in FIG. 6) and a second region on the side far from the photographing apparatus camera. For example, a double-headed arrow A21 in FIG. 5 indicates a first region on the side close to the photographing camera, and a double-headed arrow A22 indicates a second region on the side far from the photographing camera.

  Irregularities are formed on the surface of the first region of the bottom portion 13. Further, the surface of the second region of the bottom 13 is a flat surface. In addition, in the bottom part 13 shown in FIG. 2, the illustration of the unevenness | corrugation of the surface is abbreviate | omitted.

  As described with reference to FIG. 4, the heat generating portion 31 has a uniform amount of heat generated in the plane. However, the unit surface area of the bottom 13 is larger in the first region than in the second region. For this reason, the calorific value per unit area in the plan view radiated through the first region of the bottom portion 13 is larger than the calorific value per unit area in the plan view radiated through the second region. growing.

  6 is a cross-sectional view taken along the line AA in FIG. In FIG. 6, the same components as those in FIG. 6 shows a cross section taken along the line AA when the heating device 10 of FIG. 2 is attached to the windshield 1a of the vehicle 1, and also shows a part of the windshield 1a of the vehicle 1. FIG. .

  FIG. 6 shows a photographing camera 41 fixed to the opening X1 of the back portion 16. An arrow A31 illustrated in FIG. 6 indicates the shooting direction of the shooting camera 41. The arrow A3 shown in FIG. 2 corresponds to the arrow A31 in FIG. Moreover, arrow A32 shown in FIG. 6 has shown the emitted-heat amount of the heat | fever radiated | emitted from the bottom part 13, and has shown that it is so large that the length of arrow A32 is long.

  As described with reference to FIG. 5, the amount of heat generated in the surface of the heat generating portion 31 is uniform. However, the surface area of the bottom 13 is larger in the first region closer to the photographing camera 41 than in the second region farther from the photographing camera 41. For this reason, the calorific value per unit area in the plan view radiated through the first region of the bottom portion 13 is larger than the calorific value per unit area in the plan view radiated through the second region. growing.

  Here, it is assumed that the entire surface of the bottom portion 13 is formed in a flat shape, and uniform heat is radiated. In this case, the temperature of the portion of the windshield 1a that is far from the bottom 13 is lower than the portion of the windshield 1a that is close to the bottom 13. For example, the temperature of the portion of the windshield 1a indicated by the arrow A33a in FIG. 6 is lower than that of the portion of the windshield 1a indicated by the arrow A33b.

  However, as indicated by an arrow A32, the amount of heat generated per unit area in the plan view radiated through the first region of the bottom portion 13 is the unit area in the plan view radiated through the second region. It is larger than the amount of heat generated per hit. Thereby, the windshield 1a of the vehicle 1 included in the photographing range of the photographing camera 41 is warmed so that the temperature becomes uniform.

  As described above, the heating device 10 that warms the windshield 1a included in the shooting range of the shooting camera 41 that shots the outside of the vehicle 1 includes the main body 11 having the opening X2 that opens in the shooting direction of the shooting camera 41. The main body part 11 is disposed on the side opposite to the side where the windshield 1a is located, and generates heat uniformly in the surface and supplies heat to the bottom part 13 of the main body part 11, Is provided. And the bottom part 13 of the main-body part 11 has the 1st area | region in the side near the imaging | photography camera 41, and the 2nd area | region in the side far from the imaging | photography camera 41, and radiates | emits via a 1st area | region. The amount of heat per unit area in plan view is larger than the amount of heat per unit area in plan view radiated through the second region. Thereby, the heat generating apparatus 10 can warm up the temperature of the windshield 1a, making the heat generating part 31 a simple structure.

  In addition, irregularities are formed on the surface of the first region of the bottom 13, and the surface of the second region is flat. Thereby, the heat generating apparatus 10 can warm up the temperature of the windshield 1a, making the heat generating part 31 a simple structure.

  Further, the heat generating portion 31 can uniformly form the heater wire thickness, the heater wire thickness, and the heater wire interval. Therefore, the heat generating device 10 is easier than the heat generating device that uniformly heats the windshield 1a by forming the heater wire thickness, heater wire thickness, or heater wire interval in the heat generating portion non-uniformly. Can be manufactured. In addition, the design of the heat generating portion 31 is facilitated. Furthermore, the cost of the heat generating device 10 can be reduced.

  In addition, the uneven | corrugated shape of the surface of the bottom part 13 is not restricted to the shape shown in FIG. For example, the shape is not limited to the shape shown in FIG. 5 as long as the surface area of the first region is increased.

  In FIG. 5, the area of the bottom portion 13 is divided into two areas of the first area and the second area, but the number of areas is not limited to this. For example, the bottom 13 may have two or more regions, and unevenness may be formed so that the surface area of each region becomes smaller as the distance from the imaging camera 41 increases.

  Further, the shape of the heat generating portion 31 shown in FIG. 4 is not limited to the shape of FIG. The width of the heat generating portion 31 indicated by the double arrow A12 in FIG. 4 may be formed so as to become narrower in the photographing direction indicated by the arrow A11.

  Moreover, although the main-body part 11 was formed with resin, such as a plastics, for example, the diffuser cover 21 may be formed with a metal so that the thermal radiation of the heat-emitting part 31 may become good.

[Second Embodiment]
In the first embodiment, the amount of heat per unit area radiated from the surface of the bottom portion 13 is changed by the unevenness of the surface of the bottom portion 13. In the second embodiment, the thickness of the bottom 13 is changed to change the amount of heat per unit area radiated from the surface of the bottom 13. Below, a different part from 1st Embodiment is demonstrated.

  FIG. 7 is a cross-sectional view taken along line AA in FIG. 4 according to the second embodiment. In FIG. 7, the same components as those in FIG.

  Unlike the bottom 13 shown in FIG. 5, the bottom 51 shown in FIG. 7 has a flat surface in the first region indicated by the double arrow A21. However, in the bottom 51 shown in FIG. 7, the thickness of the first region is thinner than the thickness of the second region.

  As described with reference to FIG. 4, the heat generation amount per unit area of the heat generating portion 31 is uniform. However, the thickness of the bottom portion 13 is thinner in the first region than in the second region. For this reason, the calorific value per unit area in the plan view radiated through the first region of the bottom portion 13 is larger than the calorific value per unit area in the plan view radiated through the second region. large. Therefore, the heat generating apparatus 10 can also be warmed so that the temperature of the windshield 1a of the vehicle 1 becomes uniform even when it has the bottom 51 shown in FIG.

  As described above, the thickness of the first region of the bottom 51 is smaller than the thickness of the second region. Thereby, the heat generating apparatus 10 can warm up the temperature of the windshield 1a, making the heat generating part 31 a simple structure.

  In FIG. 7, the area of the bottom 51 is described as being divided into two areas of the first area and the second area, but the number of areas is not limited thereto. For example, the bottom 51 may be formed such that there are two or more regions, and the thickness of each region increases as the distance from the photographing camera 41 increases.

DESCRIPTION OF SYMBOLS 1 Vehicle 1a Windshield 2 Image recording apparatus 10 Heat generating apparatus 11 Main body part 12 Fixed part 13,51 Bottom part 14,15 Side part 16 Back part X1, X2 Opening part 21 Diffuse cover 31 Heat generating part 41 Shooting camera

Claims (3)

A heating device for heating the glass surface of the vehicle included in the imaging range of the imaging device for imaging the outside of the vehicle,
A main body having an opening that opens in the photographing direction of the photographing device;
A sheet-like heat generating part that is disposed on the side opposite to the side where the glass surface is present with respect to the main body part, generates heat uniformly in the surface, and supplies heat to the bottom of the main body part;
With
The bottom portion of the main body has a first region on the side closer to the imaging device and a second region on the side far from the imaging device, and is a plan view that radiates through the first region. The amount of heat per unit area at is greater than the amount of heat per unit area in plan view radiating through the second region,
Heating device.   The heat generating device according to claim 1, wherein unevenness is formed on a surface of the first region, and a surface of the second region is a flat surface.   The heat generating device according to claim 1, wherein a thickness of the first region is smaller than a thickness of the second region.

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