JP2007015457A - Thermal insulation construction of car-mounted apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To protect a car-mounted apparatus installed in the condition close to a windshield effectively against heat detriment as well during the engine being in operation as at a standstill. <P>SOLUTION: The upper part of the inner surface of the windshield 50 is subjected to a heat insulating process using a heat insulating member 70 consisting of a ceramic material. The heat rays T from solar beams incident to the upper part of the windshield 50 are reflected by the heat insulating member 70, so that a car-mounted camera 100 confronting the upper back face of the windshield 50 can be protected effectively against heat detriment even in case the vehicle is left under the blazing sun. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a heat insulation structure for an in-vehicle device that suppresses a temperature rise of the in-vehicle device that is exposed in the vicinity of the upper portion of a windshield.

  Generally, an in-vehicle camera is known as an in-vehicle device disposed near the upper portion of a windshield in a vehicle interior. This in-vehicle camera is often set so that the upper end of the viewing angle is the upper edge of the wiper wiping area so that a good visual field can be secured even in rainy weather.

  The angle of view of a conventional in-vehicle camera is relatively narrow. Therefore, when the angle of view is adjusted to the upper end of the wiper wiping area, the in-vehicle camera is placed relatively behind the vehicle body, so that the in-vehicle camera is directly irradiated with sunlight. There is little to be done.

  However, conventional in-vehicle cameras with a narrow angle of view have limitations in the recognition of preceding vehicles in tight corners and the accuracy of pedestrian recognition on ordinary roads including nighttime. It tends to be adopted to improve the forward recognition performance.

  When the angle of view of the in-vehicle camera is widened, when trying to match this angle of view with the upper end of the wiper wiping area, the mounting position is inevitably moved downward from the mounting position of the conventional in-vehicle camera, or Although it is necessary to make it close to the windshield side, when the vehicle-mounted camera is moved downward, it gives a feeling of pressure to the passenger, so it is arranged at a position close to the upper part of the windshield.

  However, when the in-vehicle camera is arranged close to the top of the windshield, especially when the windshield is greatly inclined in a vehicle such as a passenger car type, it is easy to directly irradiate the in-vehicle camera with sunlight. Become. When sunlight is directly applied to the in-vehicle camera, a temperature increase due to an infrared ray (heat ray) effect included in the sun rays causes an adverse effect on the in-vehicle camera due to heat damage.

As a countermeasure against this, the applicant of Patent Document 1 (Japanese Patent No. 31484949) opens a vent hole in the cover of the in-vehicle camera and takes in the conditioned air flowing along the windshield from the defroster side. We proposed a technology that cools electronic components such as CCD inside the cover and protects the in-vehicle camera from heat damage by arranging it at an easy position.
Japanese Patent No. 3148749

  However, in the technique disclosed in the above-mentioned document, while the engine is running, the air-conditioned air is supplied from the defroster to the in-vehicle camera, thereby ventilating the in-vehicle camera and preventing the temperature rise. If the vehicle is left in the sun, such as when it is parked in a space, sunlight is likely to be directly applied to the in-vehicle camera, and thus the in-vehicle camera cannot be effectively protected from heat damage.

  Since the CCD built in the vehicle-mounted camera is likely to be mixed with noise when the temperature is raised, the function is temporarily stopped when the temperature rises above a certain guaranteed operating temperature.

  When a vehicle parked in hot weather is restarted, the temperature of the in-vehicle camera is the guaranteed operating temperature even if the air-conditioning air is supplied to the in-vehicle camera because the in-vehicle camera is already hot. Therefore, it does not immediately decrease to the following, and therefore it takes time until the in-vehicle camera returns to a normal operating state, which causes inconvenience to the driver. In addition, when the in-vehicle camera is frequently damaged by heat, deterioration of electronic components represented by a CCD built in the in-vehicle camera is promoted, which is not preferable.

  Such heat damage occurs not only in the in-vehicle camera but also in in-vehicle devices (such as a monitor and a watch) disposed in the vicinity of the windshield.

  In view of the above circumstances, the present invention effectively protects an in-vehicle device disposed in the state of being close to the windshield even when the engine is stopped as well as when the engine is stopped from being built in. It is an object of the present invention to provide a heat insulation structure for an in-vehicle device that can suppress deterioration of an electronic component that has been promoted and can obtain high reliability.

  In order to achieve the above object, according to a first aspect of the present invention, an in-vehicle device is disposed at a position close to the windshield above the windshield in a vehicle interior, and at least heat rays from sunlight on the windshield are incident on the in-vehicle device. A heat shielding member is disposed at a position where the heat shielding is performed.

  According to a second aspect of the present invention, an in-vehicle device is disposed in a position close to the windshield above the windshield in a vehicle interior, and at least heat rays from sunlight between the windshield and the in-vehicle device are incident on the in-vehicle device. A heat shielding member is disposed at a position where the heat shielding is performed.

  The third invention is characterized in that a heat shield member is provided around an electronic component provided in an in-vehicle device provided in a position close to the windshield above the windshield in the vehicle interior.

  According to a fourth aspect of the present invention, an in-vehicle device is disposed at a position close to the windshield above the windshield in a vehicle interior, and at least heat rays from sunlight between the windshield and the in-vehicle device are incident on the in-vehicle device. A heat insulating layer is formed on the surface to be formed.

  According to the present invention, since the heat shield member and the heat insulating layer are provided on the windshield, or between the windshield and the on-vehicle equipment, or on the on-vehicle equipment, even if left in the sun, it is directly affected by the heat damage caused by sunlight. Therefore, even when the engine is in operation, even when the engine is stopped, the in-vehicle devices that are arranged close to the windshield are effectively protected from heat damage, and the built-in electronics It is possible to suppress the deterioration of components and to obtain high reliability.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
1 to 3 show a first embodiment of the present invention. FIG. 1 shows an exploded perspective view of an in-vehicle camera attached to the vehicle. An arrow F in the figure indicates the front of the vehicle body.

  An in-vehicle camera 100 that is an example of an in-vehicle device is fixed to a front rail 40 that is a vehicle body structural member that extends in the vehicle width direction and is provided in a front part of a vehicle interior of the vehicle 1. Reference numeral 1r denotes a roof and 50 denotes a windshield.

  The in-vehicle camera 100 employed in this embodiment is a stereo camera composed of a pair of cameras, and as shown in FIG. 3, a pair of camera units 20a and 20b are disposed on both the left and right sides with the room mirror 91 interposed therebetween.

  As shown in FIG. 1, the camera units 20a and 20b are fixed to the left and right sides of a chassis 10 as a base, and a mounting seat 11 having a predetermined height provided at the center of the chassis 10 is a bracket. The bracket 12 is fixed to the front rail 40. Further, a cover member 14 that covers the entire chassis 10 from below is attached to the chassis 10.

  The cover member 14 is divided into a front cover 14a and a rear cover 14b, and both are connected by a fixing means 82. Each of the camera units 20a and 20b employed in this embodiment includes a lens 21 and a CCD unit 22 that is disposed behind the lens 21 and is representative of electronic components.

  The lens 21 employs a wide-angle lens, and therefore has a relatively wide angle of view, as shown by a one-dot chain line in FIG. Incidentally, when setting the mounting position of the in-vehicle camera 100, it is necessary to set the upper end of the angle of view to be the upper edge of the wiper wiping area in order to ensure a good field of view even in rainy weather. . Accordingly, as the angle of view becomes wider, the camera units 20a and 20b themselves are inevitably disposed at positions close to the upper inner surface side of the windshield 50.

  When the camera units 20a and 20b are brought close to the upper inner surface of the windshield 50, the entire vehicle-mounted camera 100 faces the upper lower side of the windshield 50, so that the bracket 12 is relatively near the rear portion 12b. It is fixed to the front rail 40 via a fixing means 81 such as a bolt.

  The front half 12f in the front-rear direction of the bracket 12 is relatively opposed to the inner surface 50i of the windshield 50, and the gap 61 between the inner surface 50i and the front half 12f of the bracket 12 serves as a heat insulating layer. An air layer is formed.

  Further, the mounting seat 11 formed at the center of the chassis 10 has a predetermined height (plate thickness), and therefore, between the upper surface of the surrounding chassis 10 and the back surface 12r of the bracket 12. An air layer as a heat insulating layer is formed in the gap 60.

  In addition, heat treatment using the heat shielding member 70 is applied to at least the heat shielding region 50ir on the opposite surface of the upper inner surface 50i of the windshield 50 that is exposed to the windshield 50 side of the in-vehicle camera 100. The heat shield member 70 is a ceramic material such as black ceramic having a light shielding property, for example. After the ceramic material is printed on the heat shield region 50ir of the inner surface 50i of the windshield 50, the heat shield member 70 is heat treated and fired. Is given.

  In this case, as shown in FIG. 3, the region coated with the heat shield member (ceramic print) 70 may be a region W slightly wider than the entire width of the in-vehicle camera 100, but the upper outer edge of the windshield 50 May be printed along the entire area in the vehicle width direction. By coating the entire area of the windshield 50 in the vehicle width direction, it is possible to prevent the in-vehicle camera 100 from being directly irradiated with the heat rays T from sunlight even when sunlight is incident obliquely from the front of the vehicle body.

  In addition, the line S1 shown with a dashed-two dotted line in the figure shows the lower end of the general black ceramic printed along the periphery of the windshield 50, and the line S2 shows the lower end of the heat insulation member 70. Is. When the conventional black ceramic has a heat shielding property, or when the black ceramic is provided with a heat shielding property, the black ceramic may be extended to the line S2 to function as the heat shielding member 70.

  In this case, the heat shield member 70 may be a ceramic sheet. When the heat shield member 70 is a ceramic sheet, heat treatment is performed by directly attaching the ceramic sheet to the heat shield region 50ir of the inner surface 50i of the windshield 50.

  Next, the operation of the embodiment configured as described above will be described. For example, when the vehicle 1 is left in the direction in which sunlight enters from the windshield 50 under hot weather, the heat rays T from sunlight are incident on the windshield 50 as shown in FIG. Since the heat shield member 70 made of a ceramic print or a ceramic sheet is disposed on the upper inner surface of the windshield 50, the heat ray T incident on this portion is reflected by the heat shield member 70. The in-vehicle camera 100 disposed on the vehicle interior side of the heat shield member 70 is not directly irradiated with the heat ray T and heated.

  In addition, an air layer is formed in the gap 61 between the inner surface 50 i of the windshield 50 and the bracket 12 of the in-vehicle camera 100 and the gap 60 between the rear surface 12 r of the bracket 12 and the periphery of the mounting seat 11 of the chassis 10. Therefore, the radiant heat from the heat ray T with respect to the vehicle-mounted camera 100 can be shielded more effectively.

  That is, the thermal conductivity of air (0.0241 [W / m · K]) is the thermal conductivity of other materials (eg BS resin: 0.18 [W / m · K], glass: 1 [W / m · K]). , Iron: 84 [W / m · K], aluminum: 236 [W / m · K]), and can efficiently block the transmission of radiant heat without any inclusions.

  Accordingly, even when the vehicle 1 is left in the direction in which sunlight is incident from the windshield 50 under the hot sun, the heat shielding effect by the heat shielding member 70 and the gaps 60 and 61 are formed. The heat insulation effect by the air layer can effectively prevent the heat damage received by the in-vehicle camera 100 and suppress the high temperature. As a result, it is possible to improve the durability of an electronic component typified by a CCD built in the in-vehicle camera 100.

  On the other hand, after starting the engine from a state where it is left in the hot sun, for example, when a general auto air conditioner is operated, the conditioned air is first blown out from the outlet of the defroster for several seconds. The conditioned air blown out from the defroster rises along the inner surface of the windshield 50, a part of which passes through the inside from the open ends of the gaps 60 and 61 as indicated by arrows C1 and C2, and others. A part of the air flows directly into the cover member 14 and is forcedly convected.

  As described above, since the in-vehicle camera 100 is effectively protected from heat damage even when left in the hot sun, the internal temperature of the in-vehicle camera 100 is sufficiently reduced by forced convection by conditioned air from the defroster. Therefore, the in-vehicle camera 100 can be operated immediately. As a result, the vehicle-mounted camera 100 can be operated satisfactorily without restricting its function immediately after the engine is started.

  After that, when the bench mode is entered and the conditioned air adjusted based on the room temperature, the outside air temperature, and the solar radiation information is supplied to the vehicle interior and the vehicle interior temperature is lowered, the heat H in the cover member 14 is caused by natural convection. Heat is dissipated. Therefore, the internal heat generated by the operation of the camera units 20a and 20b can also be efficiently radiated.

  As described above, in this embodiment, the heat shield region 70ir is applied to the heat shield region 50ir of the inner surface 50i of the windshield 50, the gap 61 between the windshield 50 and the bracket 12, and the bracket. Since an air layer is formed in the gap 60 between the chassis 12 and the chassis 10, they exhibit heat shielding and heat insulation effects, and effectively make the vehicle-mounted camera 100 effective from the heat damage caused by the solar heat rays T. Can be protected.

  FIG. 4 shows a cross-sectional view of a main part of a windshield according to the second embodiment of the present invention. Generally, a laminated glass in which an intermediate film 50b made of a transparent resin sheet is sandwiched between two glasses 50a is used as the windshield 50.

  In the present embodiment, a material having a heat shielding property is kneaded into a portion corresponding to the heat shield region 50ir shown in the first form of the intermediate film 50b, and a part of the intermediate film 50b is used as the heat shield member 70. is there.

  By integrally forming the heat shield member 70 on the intermediate film 50b, it is not necessary to perform a heat shield after the windshield 50 is manufactured, and the manufacturing process can be simplified.

  5 and 6 show a third embodiment of the present invention. In each embodiment described above, the windshield 50 is subjected to a heat shield to reflect the heat rays T. However, in this embodiment, the heat shield plate 170 as a heat shield member is provided between the windshield 50 and the in-vehicle camera 100. It is something that interposes. In addition, since the structure of the vehicle-mounted camera 100 is the same as the 1st form mentioned above, the same code | symbol is attached | subjected to the same component and description is abbreviate | omitted.

  The heat shield plate 170 is made of a material having low thermal conductivity such as resin, and is disposed on the upper surface of the front half 12f of the bracket 12 so as to cover at least the camera units 20a and 20b from above. Yes. Locking portions 170 a are formed at both ends of the heat shield plate 170. The center portion of the heat shield plate 170 is fixed to the bracket 12, and both ends of the heat shield plate 170 are hooked on the upper surface of the cover member 14 via locking portions 170 a overhanging the bracket 12.

  In this embodiment, the heat shield plate 170 is disposed on the upper surface of the bracket 12 and the heat shield plate 170 reflects the heat rays T from sunlight. Therefore, the windshield 50 may be a conventional standard product. Thus, production efficiency is improved. The heat shield plate 170 is not limited to resin, but may be made of ceramic, glass fiber, or rubber.

  Of course, in this case, the vehicle-mounted camera 100 can be more effectively protected from heat damage if the windshield 50 is subjected to heat shielding as in the first embodiment or the second embodiment.

  FIG. 7 is a sectional view corresponding to FIG. 2 according to the fourth embodiment of the present invention. In the third embodiment described above, the heat shield plate 170 is disposed on the bracket 12, but in this embodiment, the lens 21 and the CCD unit 22 provided in each of the camera units 20a and 20b that are most susceptible to thermal damage. A heat shield sheet 171 as an example of a heat shield member is pasted on the upper surface of the lens to shield the radiant heat from the heat ray T transmitted to the upper surfaces of the lens 21 and the CCD unit 22.

  The material of the heat shielding sheet 171 is not limited to resin as long as it has a low thermal conductivity, is flexible, and has good workability, and is made of ceramic, glass fiber, rubber, etc., as in the third embodiment described above. There may be.

  In this embodiment, since the heat shield sheet 171 is directly attached to the CCD unit 22, the heat shield sheet 171 can be attached in advance to the CCD unit 22 before the in-vehicle camera 100 is assembled. The manufacturing process is not complicated, parts management is easy, and handling is good.

  Even in this case, if the windshield 50 is subjected to heat-shielding as in the first or second form described above, and the heat-shielding plate 170 of the third form is provided if necessary, the vehicle is mounted on the vehicle. The camera 100 can be more reliably protected from heat damage.

  FIG. 8 is a sectional view corresponding to FIG. 2 according to the fifth embodiment of the present invention. In each of the embodiments described above, one of the windshield 50 or the in-vehicle camera 100 is subjected to a heat-shielding process. However, in this embodiment, a large number of the cover member 14, particularly the portions where the camera units 20 a and 20 b are disposed. A ventilation hole 150 is formed.

  By providing a large number of vent holes 150 in the cover member 14, the heat dissipation effect by natural convection can be enhanced. In this case, some of the air holes 150 are opened along the inner surface of the windshield 50 at positions where air-conditioned air blown from the blow-out port 210 of the defroster can be easily taken in. When this is done, a portion of the conditioned air that is blown out from the defroster first can flow into the cover member 14 as shown by the arrow C3 from the vent hole 150 and can be dissipated by forced convection.

  Also in this case, as in the case described above, the heat shields shown in the respective embodiments may be appropriately combined and employed.

  The present invention can be applied not only to the in-vehicle camera 100 but also to various in-vehicle devices that incorporate electronic components such as a monitor and a watch as long as the in-vehicle device is disposed in the vicinity of the windshield.

The disassembled perspective view of the vehicle-mounted camera attached to the vehicle by the 1st form Same as above, sectional side view of the part where the camera unit of the in-vehicle camera is installed Same as above, illustration of the windshield viewed from the passenger compartment Sectional drawing of the main part of the windshield upper part by 2nd form The disassembled perspective view of the vehicle-mounted camera attached to the vehicle by the 3rd form Sectional view equivalent to FIG. Sectional drawing equivalent to FIG. 2 by 4th form Sectional drawing equivalent to FIG. 2 by 5th form

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Vehicle 10 ... Chassis 12 ... Bracket 14 ... Cover member 20 ... Windshield 20a, 20b ... Camera unit 22 ... CCD unit 50 ... Windshield 50b ... Intermediate film 50ir ... Heat insulation area 60, 61 ... Gap 70 ... Heat insulation Member 100 ... In-vehicle camera 150 ... Vent hole 170 ... Heat shield plate 171 ... Heat shield sheet T ... Heat ray

Claims (6)

An in-vehicle device is arranged at a position near the windshield at the top of the windshield in the vehicle interior,
A heat insulating structure for an in-vehicle device, wherein a heat shield member is disposed at a position where at least heat rays from sunlight on the windshield are incident on the in-vehicle device. An in-vehicle device is arranged at a position near the windshield at the top of the windshield in the vehicle interior,
A heat insulating structure for an in-vehicle device, wherein a heat shield member is disposed at a position where at least heat rays from sunlight between the windshield and the in-vehicle device are incident on the in-vehicle device.   A heat insulation structure for an on-vehicle device, characterized in that a heat shield member is disposed around an electronic component provided in the on-vehicle device disposed at a position close to the windshield above the windshield in a vehicle interior. . An in-vehicle device is arranged at a position near the windshield at the top of the windshield in the vehicle interior,
A heat insulating structure for an in-vehicle device, wherein a heat insulating layer is formed on a surface where at least heat rays from sunlight between the windshield and the in-vehicle device are incident on the in-vehicle device.   5. The heat insulation layer is an air layer, and an upstream side of the air layer is opened in a direction for taking in conditioned air blown from a defroster provided on a lower side of the windshield. Thermal insulation structure for in-vehicle equipment.   The heat insulation structure for an in-vehicle device according to any one of claims 1 to 5, wherein a vent hole is formed in the cover of the in-vehicle device.

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