JP6953182B2 - Heat generator - Google Patents

Description

The present invention relates to a heat generating device.

Currently, vehicles are increasingly equipped with image recording devices. Some image recording devices for this vehicle are attached to the windshield from inside the vehicle.

In an image recording device attached to the windshield from inside the vehicle, if the windshield in front of the photographing camera becomes cloudy due to dew condensation or the like, the image of the photographing camera may become unclear.

Therefore, there is an image recording device provided with a foil heater. The image recording device heats the windshield in front of the photographing device with a foil heater to prevent fogging, and photographs and records images in front of the vehicle.

In order to record an even image in an image recording device, it is important to uniformly remove fogging on the windshield in front of the photographing device. In order to uniformly remove the fogging of the windshield in front of the photographing device, it is important to uniformly warm the windshield in front of the photographing device.

In Patent Document 1, the foil heater is formed so that the heat radiant output for each unit area of two different surface areas or length areas is different, and the heat radiant output of the foil heater far from the windshield is increased to increase the heat radiant output from the windshield. The heat radiant output of the nearby foil heater is reduced. In this way, Patent Document 1 reduces the temperature difference between the windshield portion that is far from the foil heater and the windshield portion that is close to the foil heater.

International Publication No. 2012/069115

However, if the thickness and thickness of the heater wires are changed or the intervals between the heater wires are 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.

Therefore, an object of the present invention is to provide a heat generating device capable of heating the windshield in front of the photographing device so that the temperature of the windshield becomes uniform while having a simple structure of the heat generating portion.

The heat generating device of the present invention is a heat generating device that warms the glass surface of the vehicle included in the photographing range of the photographing device that photographs the outside of the vehicle, and has an opening that opens in the photographing direction of the photographing device and the glass surface. It has a main body portion having a bottom portion which is arranged to face the bottom portion , and a surface which is located on the side opposite to the side where the glass surface is located with respect to the bottom portion and is arranged in a surface shape along the bottom portion. uniformly heating, pre SL includes a calling thermal unit you supply heat to the bottom, and the glass surface side of the surface of the front Symbol bottom, a first inclined surface inclined in the shooting direction, the It has a second slope that is inclined to the side opposite to the photographing direction, and the surface area of the second slope is larger than the surface area of the first slope.

According to the present invention, it is possible to heat the heat generating portion so that the temperature of the windshield in front of the photographing apparatus becomes uniform while having a simple structure.

It is a figure when the image recording apparatus equipped with the heat generating device which concerns on embodiment is attached to a vehicle. It is a perspective view of the heat generating device which an image recording apparatus has. It is a perspective view which looked at the diffused cover from the back side (the inside of a vehicle). It is a figure which showed the heat generating part attached to the back side of the bottom part. FIG. 4 is a cross-sectional view taken along the line AA of FIG. FIG. 2 is a cross-sectional view taken along the line AA of FIG.

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

FIG. 1 is a diagram when an image recording device equipped with a heat generating device according to an 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 device 2 includes a photographing camera and photographs the front of the vehicle 1. The image recording device 2 stores the image data captured by the photographing camera in a storage device such as an HDD (Hard Disk Drive), for example.

FIG. 2 is a perspective view of the heat generating device 10 included in the image recording device 2. As shown in FIG. 2, the heat generating device 10 has a main body portion 11. The main body 11 is made of, for example, plastic. As will be described later, the heat generating device 10 has a heat generating portion and heats the windshield 1a included in the shooting range of a shooting camera (see, for example, the shooting camera 41 of FIG. 6) that shoots the outside of the vehicle 1. The arrow A3 in FIG. 2 indicates the shooting direction of the shooting camera fixed to the back portion 16 described later.

The main body portion 11 has a fixing portion 12, a bottom portion 13, side portions 14, 15 and a back portion 16.

The fixing portion 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 portion 12 is fixed to the windshield 1a by, for example, double-sided tape.

The bottom portion 13 has a planar shape. The width of the bottom portion 13 shown by the double-headed arrow A1 in FIG. 2 is formed so as to gradually widen toward the arrow tip direction of the arrow A3. That is, the width of the bottom portion 13 is formed so as to gradually widen toward the shooting direction of the shooting camera.

The side portions 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 shown by the double-headed arrow A2 in FIG. 2 are formed so as to gradually decrease toward the arrow tip direction 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 portion 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 a photographing camera is inserted into the opening X1 (see, for example, FIG. 6).

The main body 11 has a concave opening X2 surrounded by a bottom 13, sides 14, 15 and a back 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, 15 and the back portion 16 may be integrally formed so as to be removable from the main body portion 11. The bottom 13, sides 14, 15 and back 16 are also referred to as diffuse covers or hoods. Hereinafter, the bottom portion 13, the side portions 14, 15 and the back portion 16 are referred to as a diffuser cover. The diffused cover suppresses the diffused light from the inside of the vehicle from entering the photographing camera.

FIG. 3 is a perspective view of the diffuser cover 21 as viewed from the back side (inside the vehicle 1). In FIG. 3, the same ones as those in FIG. 2 are designated by the same reference numerals. As shown in FIG. 3, the diffuser cover 21 is formed by a bottom portion 13, side portions 14, 15 and a back portion 16.

On the back side of the bottom 13 of the diffuser cover 21, a heat generating portion 31 is provided as shown by diagonal lines. 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 double-sided tape.

FIG. 4 is a diagram showing a heat generating portion 31 attached to the back side of the bottom portion 13. In FIG. 4, the same ones as those in FIGS. 2 and 3 are designated by the same reference numerals. The arrow A11 shown in FIG. 4 indicates the shooting direction of the shooting camera.

The heat generating portion 31 (the portion indicated by the dotted line frame) is formed by, for example, a planar heat generating 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 so that the width becomes constant in the shooting direction of the shooting camera. For example, the heat generating portion 31 is formed so that the width is constant as shown by the double-headed arrow A12 in FIG.

The thickness and thickness of the heater wire of the heat generating portion 31 are uniformly formed. Further, in the heat generating portion 31, the intervals between the heater wires are uniformly formed. Therefore, the heat generating portion 31 has a uniform amount of heat generated in the plane (inside the frame of the dotted line).

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

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

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

The surface of the first region of the bottom 13 is flat. A plurality of slopes are serrated on the surface of the second region of the bottom 13. In the bottom portion 13 shown in FIG. 2, the slope of the second region is not shown.

The slope of the second region of the bottom portion 13 has a first slope inclined toward the photographing direction (left direction in FIG. 5) and a second slope inclined toward the side opposite to the photographing direction. For example, the slopes shown by arrows A23 and A25 in FIG. 5 are first slopes that are inclined toward the photographing direction, and the slopes shown by arrows A24 and A26 are second slopes that are inclined toward the side opposite to the photographing direction.

The surface area of the second slope is formed to be larger than the surface area of the first slope. For example, the surface area of the second slope shown by arrows A24 and A26 is formed to be larger than the surface area of the first slope shown by arrows A23 and A25.

The slope of the second slope is smaller toward the shooting camera side (to the right in FIG. 5). For example, the second slope shown by arrow A26 is closer to the shooting camera side than the second slope shown by arrow A24. The second slope shown by the arrow A26 near the photographing camera side has a smaller slope than the second slope shown by the arrow A24.

FIG. 6 is a cross-sectional view taken along the line AA of FIG. In FIG. 6, the same ones as those in FIG. 2 are designated by the same reference numerals. Note that FIG. 6 shows a cross section taken along the line AA when the heat generating 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. ..

Further, FIG. 6 shows a photographing camera 41 fixed to the opening X1 of the back portion 16. The arrow A31 shown 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. Further, the arrows A32a to A32c shown in FIG. 6 indicate the heat radiated from the bottom portion 13, and the length thereof indicates the magnitude of the heat.

As described with reference to FIG. 4, the amount of heat generated in the plane of the heat generating portion 31 is uniform. However, as described with reference to FIG. 5, since the surface of the second region of the bottom 13 is formed in a sawtooth shape, the direction of heat radiated from the surface of the bottom 13 is inclined with respect to the bottom 13.

For example, the direction of heat radiated from the second slope is inclined toward the photographing camera 41. For example, the heat shown by the arrows A32a and A32c in FIG. 6 indicates the heat radiated from the second slope and is inclined toward the photographing camera 41. On the other hand, the direction of heat radiated from the first slope is inclined to the side opposite to that of the photographing camera 41. For example, the heat shown by the arrow A32b in FIG. 6 indicates the heat radiated from the first slope and is inclined to the opposite side of the photographing camera 41.

Further, as described with reference to FIG. 5, the surface area of the second slope is larger than the surface area of the first slope. Therefore, the heat released from the second slope is larger than the heat released from the first slope. For example, the heat released from the second slope shown by arrows A32a and A32c in FIG. 6 is larger than the heat released from the first slope shown by arrow A32b.

Further, as described with reference to FIG. 5, the slope of the second slope of the bottom portion 13 is smaller as the slope is closer to the photographing camera 41. Therefore, the heat radiated from the second slope of the bottom portion 13 becomes smaller in the radiating direction as it is closer to the photographing camera 41 side. For example, the heat radiated from the second slope shown by the arrow A32a in FIG. 6 has a smaller inclination with respect to the normal of the bottom 13 than the heat radiated from the second slope shown by the arrow A32c.

By changing the direction of the heat radiated from the bottom portion 13 in this way, the heat can be radiated to a specific portion of the windshield 1a. For example, the heat radiated from the bottom portion 13 can be radiated to the portion of the windshield 1a indicated by the arrow A33a.

Here, it is assumed that the entire surface of the bottom 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 portion 13 is lower than that of the portion of the windshield 1a that is close to the bottom portion 13. For example, the temperature of the portion of the windshield 1a shown by the arrow A33a in FIG. 6 is lower than that of the portion of the windshield 1a shown by the arrow A33b.

However, as described above, the direction of the heat radiated from the bottom 13 is inclined and directed to a specific portion of the windshield 1a. If the heat directed to this specific portion is radiated to the portion where the temperature of the windshield 1a becomes low, the windshield 1a can be uniformly heated. For example, if the heat radiated from the bottom portion 13 is radiated to the portion of the windshield 1a indicated by the arrow A33a, which is far from the bottom portion 13, as shown by the arrows A32a and 32c in FIG. It is warmed so that the temperature is uniform.

As described above, the heat generating device 10 for heating the windshield 1a of the vehicle 1 included in the shooting range of the shooting camera 41 that shoots the outside of the vehicle 1 is a main body having an opening X2 that opens in the shooting direction of the shooting camera 41. The surface-shaped heat generating portion 31 is arranged on the side opposite to the side where the windshield 1a is located with respect to the portion 11 and the main body portion 11, and generates heat uniformly in the surface and supplies heat to the bottom portion 13 of the main body portion 11. And. The surface of the bottom portion 13 of the main body 11 on the windshield 1a side has a first slope inclined toward the photographing direction and a second slope inclined toward the side opposite to the photographing direction. The surface area is larger than the surface area of the first slope. As a result, the heat generating device 10 can heat the windshield 1a so that the temperature of the windshield 1a becomes uniform while the heat generating portion 31 has a simple structure.

Further, there are a plurality of second slopes on the surface of the bottom portion 13, and among the plurality of second slopes, the slope closer to the photographing camera 41 has a smaller slope. As a result, the heat generating device 10 can heat the portion where the temperature of the windshield 1a becomes low, and can heat the windshield 1a so that the temperature becomes uniform.

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

In the above, the bottom portion 13 has a portion having an inclined surface and a flat portion, but the entire surface may be inclined.

Further, in the above, it is assumed that the slope of the second slope becomes smaller as it is closer to the photographing camera 41, but the slope is not limited to this. For example, the slope of the second slope may be constant.

Further, although the main body portion 11 is formed of, for example, a resin such as plastic, the diffuser cover 21 may be formed of a metal so as to improve the heat radiation of the heat generating portion 31.

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

Claims (3)

It is a heat generating device that warms the glass surface of the vehicle included in the shooting range of the shooting device that shoots the outside of the vehicle.
A main body having an opening that opens in the photographing direction of the photographing apparatus and a bottom portion that is arranged so as to face the glass surface.
Wherein located on the side opposite to the side where said glass surface with respect to the bottom, has the bottom surface to be disposed in a planar shape along, uniformly heating in the surface, the heat before Symbol bottom and outgoing heat part supply,
With
The glass surface side of the surface of the front Symbol bottom, a first inclined surface inclined in the shooting direction, and a second inclined surface inclined on the side opposite to the imaging direction, the surface area of the second slope Is greater than the surface area of the first slope,
Heat generator. The heat generating device according to claim 1, wherein there are a plurality of the second slopes, and among the plurality of the second slopes, the slope closer to the photographing device side has a smaller slope. The surface of the bottom on the glass surface side has a plane region in a first region on the side close to the photographing device, and includes the first slope and the second slope on the side far from the photographing device. The heat generating device according to claim 1, which has two regions.

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