JP2015081875A - In-vehicle device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an in-vehicle device for achieving space saving, cost reduction and the improvement of the degree of freedom in a mounting position.SOLUTION: A driver recorder 1 includes: a driver recorder internal circuit 122 mounted on a vehicle; a power transmission coil 112 for supplying power; and a power reception coil 123 for receiving power in a non-contact state from the power transmission coil 112, and for supplying power to the driver recorder internal circuit 122. The power reception coil 123 is configured of a movable coil which is displaced in the collision of the vehicle. A collision detection device 121 which detects the collision by detecting the position displacement of the power reception coil 123 is disposed separately from the drive recorder internal circuit 122.

Description

  The present invention relates to a vehicle-mounted device, and more particularly to a vehicle-mounted device including a collision detection unit that detects a collision of a vehicle and an electronic device that operates according to a detection result of the collision detection unit.

  2. Description of the Related Art Conventionally, a drive recorder that stores an image captured by a camera when a vehicle collision is detected is known as an on-vehicle device described above (for example, Patent Document 1). This drive recorder has a problem that it is necessary to provide an acceleration sensor in order to detect the collision of the vehicle, and the cost is high and the area occupied by the apparatus is large.

  In addition, the drive recorder has a problem that the mounting position is limited because power is supplied by wire.

JP2013-140409A

  Therefore, an object of the present invention is to provide an in-vehicle device that saves space, reduces costs, and improves the degree of freedom of attachment position.

  The invention according to claim 1 for solving the above-described problem is an electronic device mounted on a vehicle, a power transmission coil for supplying power, and power received from the power transmission coil in a non-contact manner and supplied to the electronic device. A power receiving coil, wherein the power transmission coil or the power receiving coil is composed of a movable coil that is misaligned when the vehicle collides, and a collision is detected by detecting the misalignment of the movable coil. The vehicle-mounted device is characterized in that a collision detecting means for detecting the above is provided separately from the electronic device.

  The invention according to claim 2 resides in the in-vehicle device according to claim 1, wherein the electronic device is a device that performs an operation according to a detection result of the collision detection means.

  A third aspect of the invention resides in the in-vehicle apparatus according to the first or second aspect, wherein the collision detection means detects a collision based on a current or voltage of the movable coil.

  The invention according to claim 4 is characterized in that the power receiving coil is constituted by the movable coil, and the collision detecting means operates by receiving power supply from the power receiving coil. It exists in the vehicle-mounted apparatus of description.

  The invention according to claim 5 includes a case for housing the movable coil, and an elastic member that connects the movable coil and the case and supports the movable coil to the case so that the movable coil can be displaced. It exists in the vehicle-mounted apparatus of any one of Claims 1-4 characterized by the above-mentioned.

  According to a sixth aspect of the present invention, there is provided a first case that accommodates the movable coil, a second case that accommodates the first case, and a magnet that is provided in each of the first case and the second case. It exists in the vehicle-mounted apparatus of any one of Claims 1-4 characterized by the above-mentioned.

  As described above, according to the first aspect of the present invention, it is not necessary to provide an acceleration sensor in order to detect a collision by detecting a displacement of a movable coil for non-contact power transmission to an electronic device. Space saving and cost reduction can be achieved. Moreover, since power transmission can be performed without contact between the power transmission coil and the power reception coil, the degree of freedom of the mounting position is improved.

  According to the second aspect of the invention, since the electronic device is a device that performs an operation according to the detection result of the collision detection means, the detection result by the collision detection means can be easily transmitted.

  According to the invention described in claim 3, since the collision detection means detects the collision based on the current or voltage of the movable coil, it is possible to easily detect the positional deviation without using a special device.

  According to the fourth aspect of the present invention, the detection result by the collision detection means can be easily transmitted to the electronic device.

  According to the fifth aspect of the present invention, since the movable coil and the case are connected by the elastic member, the elastic member is deformed when the impact due to the collision is applied, the movable coil is displaced, and then the elastic member is By restoring, the movable coil can be returned to its original position.

  According to the sixth aspect of the present invention, since the magnets are provided in the first case and the second case, an impact exceeding the attractive force of the magnets provided in the first case and the second case is applied by the collision. Then, the first case is displaced, the movable coil is displaced, and thereafter, the movable coil can be returned to the original position by the attractive force of the magnets respectively provided in the first case and the second case.

It is a figure which shows one Embodiment of the drive recorder as a vehicle-mounted apparatus of this invention. It is a figure which shows the drive recorder shown in FIG. 1 at the time of a collision. FIG. 2 is a top view around the power receiving coil shown in FIG. 1, and FIG. FIG. 6 is a top view around the power receiving coil shown in FIG. 1 in another embodiment. (A) is a top view around the power receiving coil shown in FIG. 1 in another embodiment, and (B) is a cross-sectional view taken along the line II-II. (A) is a top view around the power receiving coil shown in FIG. 1 in another embodiment, and (B) is a cross-sectional view taken along line III-III. (A) is a top view of the periphery of the power receiving coil shown in FIG. 1 in another embodiment, and (B) is a sectional view taken along line IV-IV in (A).

  Hereinafter, a drive recorder as an in-vehicle device of the present invention will be described with reference to FIGS. A drive recorder 1 shown in FIG. 1 is mounted on a vehicle, and stores an image photographed by a camera in a temporary memory in response to the ignition being turned on. At this time, when the capacity of the temporary memory is full, the new image is overwritten in the area where the old image is stored. Further, when a vehicle collision is detected, the drive recorder 1 moves an image several seconds before the collision detection from the temporary memory to the non-volatile memory so that it does not disappear.

  As shown in FIG. 1, the drive recorder 1 includes a power transmission unit 11 and a drive recorder main body 12 that receives power supply from the power transmission unit 11. The power transmission unit 11 is disposed in the dashboard 2, for example. The power transmission unit 11 includes a power transmission power circuit 111 that supplies high-frequency power, a power transmission coil 112 that is supplied with high-frequency power from the power transmission power circuit 111, and a power transmission capacitor 113 that adjusts the resonance frequency. Yes.

  The power transmission power circuit 111 generates a high frequency power by converting a direct current power source from a vehicle battery (not shown) into an alternating current, and supplies it to the power transmission coil 112. The power transmission power circuit 111 supplies high-frequency power having a frequency equal to the resonance frequency of a resonance circuit including a power transmission coil 112 and a power transmission capacitor 113, which will be described later, and a resonance circuit including a power reception coil 123 and a power reception capacitor 124. Is provided.

  The power transmission coil 112 is configured, for example, by winding a conductive wire in a spiral shape. The power transmission capacitor 113 is connected in parallel to the power transmission coil 112, and forms a resonance circuit together with the power transmission coil 112. In this embodiment, the power transmission capacitor 113 is connected in parallel to the power transmission coil 112, but may be connected in series.

  The drive recorder main body 12 is disposed on the dashboard 2, for example. The drive recorder main body 12 includes a collision detection device 121 as a collision detection means provided separately from the drive recorder internal circuit 122 that detects a vehicle collision, an electronic device that operates according to the detection result of the collision detection device 121, and And a drive recorder internal circuit 122 as a drive recorder device.

  The drive recorder main body 12 receives power from the power transmission coil 112 in a non-contact manner and supplies the power to the drive recorder internal circuit 122 and the collision detection device 121. The power reception capacitor 124 for adjusting the resonance frequency; A power receiving power circuit 125 that converts the power received by the power receiving coil 123 into a power source for the drive recorder internal circuit 122 and the collision detection device 121, and a housing case (not shown) that houses these components are provided. .

  First, the power receiving coil 123, the power receiving capacitor 124, the power receiving power circuit 125, and the housing case (not shown) will be described before describing the collision detection device 121 and the drive recorder internal circuit 122. The power receiving coil 123 is provided, for example, in the same size and shape as the power transmitting coil 112, and is configured by winding a conducting wire in a spiral shape. The power receiving coil 123 is disposed so as to be coaxially separated from the power transmitting coil 112 when the housing case of the drive recorder main body 12 is disposed on the dashboard 2. In the present embodiment, the power transmission coil 112 and the power reception coil 123 are arranged so that the central axes thereof are along the vertical direction.

  The power receiving capacitor 124 is connected in parallel with the power receiving coil 123 and forms a resonance circuit together with the power receiving coil 123. In the present embodiment, the power receiving capacitor 124 is connected in parallel to the power receiving coil 123, but may be connected in series. Accordingly, when high-frequency power from the power transmission power circuit 111 is supplied to the power transmission coil 112, the power reception coil resonates with the resonance circuit composed of the power transmission coil 112 and the power transmission capacitor 113 and the resonance circuit composed of the power reception coil 123 and the power reception capacitor 124. 123 receives high-frequency power in a contactless manner.

  The power received by the power receiving coil 123 is supplied to a power receiving power circuit 125 through a collision detection device 121 described later. The power receiving power supply circuit 125 converts the supplied power into a voltage suitable for the drive recorder internal circuit 122 and the collision detection device 121 and then supplies the voltage to the drive recorder internal circuit 122 and the collision detection device 121.

  The power receiving coil 123 is arranged so as to be coaxial with the power transmission coil 112 as shown in FIG. On the other hand, when the vehicle collides, due to the impact (inertial force), the power receiving coil 123 as the movable coil moves and is displaced (axially displaced) with respect to the power transmitting coil 112 as shown in FIG. When the impact disappears, it returns to its original position.

  In order to shift the power receiving coil 123 in this way, the drive recorder main body 12 connects the power receiving coil 123, the power receiving coil 123, and the case 126, as shown in FIG. And a spring 127 </ b> A as an elastic member that supports the case 126 so that the position can be displaced. The power receiving coil 123 is accommodated in the resin case 128. The resin case 128 is formed by a resin mold and is provided on a flat plate having a square shape in plan view.

  The case 126 includes a bottom wall 126A and a standing wall 126B standing from the bottom wall 126A. Four standing walls 126B are provided in the front, rear, left, and right, and are provided in a rectangular tube shape. The space surrounded by the four standing walls 126 </ b> B is slightly larger than the plane of the resin case 128. Four springs 127A are provided, one end is fixed to the side surface of each standing wall 126B, and the other end is fixed to the side surface of the resin case 128. With the above configuration, when the vehicle collides and the impact is applied to the power receiving coil 123, the spring 127A is deformed, and the power receiving coil 123 moves back and forth and right and left. Thereafter, the power receiving coil 123 returns to the original position by the restoring force of the spring 127A (that is, the power receiving coil 123 and the power transmitting coil 112 are coaxial).

  As described above, when the power receiving coil 123 moves and the positional deviation between the power receiving coil 123 and the power transmitting coil 112 occurs, the degree of coupling between the power transmitting coil 112 and the power receiving coil 123 changes, so the current or voltage of the power receiving coil 123 changes. To do. Therefore, the collision detection device 121 detects a vehicle collision by detecting a positional shift of the power receiving coil 123 from a change in current or voltage of the power receiving coil 123. When collision detection device 121 detects a vehicle collision, it transmits a detection signal to drive recorder internal circuit 122. When the drive recorder internal circuit 122 receives the detection signal from the collision detection device 121, the drive recorder internal circuit 122 moves the image several seconds before the collision detection stored in the temporary memory to the nonvolatile memory.

  According to the above-described embodiment, it is not necessary to provide an acceleration sensor to detect a collision by detecting a positional deviation of the power receiving coil 123 for performing non-contact power transmission to the drive recorder internal circuit 122, and thus space saving. In addition, the cost can be reduced. Moreover, since power transmission can be performed between the power transmission coil 112 and the power reception coil 123 in a non-contact manner, the degree of freedom of the attachment position is improved. Further, the drive recorder main body 12 can be easily carried, and convenience is improved.

  Further, according to the above-described embodiment, since the electronic device is the drive recorder internal circuit 122 that performs an operation according to the detection result of the collision detection device 121, the detection result by the collision detection device 121 can be easily transmitted. it can.

  In addition, according to the above-described embodiment, the collision detection device 121 operates by receiving power supply from the power receiving coil 123, so that the detection result by the collision detection device 121 can be easily transmitted to the drive recorder internal circuit 122. it can.

  Further, according to the above-described embodiment, the power receiving coil 123 and the case 126 are connected by the spring 127A. Therefore, when an impact due to a collision is applied, the spring 127A is deformed and the power receiving coil 123 is displaced, and then The spring 127A is restored, and the power receiving coil 123 can be returned to the original position.

  Note that, according to the above-described embodiment, the spring 127A and the power supply line drawn from both ends of the power receiving coil 123 are provided separately, but the present invention is not limited to this. For example, as shown in FIG. 4, two of the four springs 127 </ b> A may be provided on the power supply line 127 </ b> B of the power receiving coil 123. Thereby, the connection of the power line 127B and the installation of the spring 127A can be performed collectively.

  Further, according to the above-described embodiment, the power receiving coil 123 is supported in the case 126 using the spring 127A. However, the present invention is not limited to this. For example, as shown in FIG. 5, it is conceivable to support the power receiving coil 123. In the example shown in FIG. 5, the power line 127 </ b> B drawn from both ends of the power receiving coil 123 is used as an elastic member, the power line 127 </ b> B is fixed to the upper surface of the standing wall 126 </ b> B of the case 126, and the power receiving coil 123 is supported on the case 126. doing. The power receiving coil 123 is not covered with the resin case 128.

  The power line 127B has a certain degree of rigidity to support the power receiving coil 123, but is deformed when a large impact such as a vehicle collision is applied. Thereby, the power receiving coil 123 is displaced, and thereafter, the power line 127B is restored, and the power receiving coil 123 can be returned to the original position. In this case, it is not necessary to separately provide the spring 127A or the like, and the power receiving coil 123 can be held in the case 126 so as to be misaligned with an inexpensive configuration.

  It is also conceivable to support the power receiving coil 123 as shown in FIG. In the example shown in FIG. 6, an elastic shaft 127C is used as the elastic member. The power receiving coil 123 is covered with a resin case 128. The elastic shaft 127 </ b> C connects the bottom surface of the resin case 128 and the bottom wall 126 </ b> A of the case 126. In this case, the power receiving coil 123 can be displaced from front to back and from side to side without providing four springs 127A.

  It is also conceivable to support the power receiving coil 123 as shown in FIG. As shown in the figure, the power receiving coil 123 is covered with a resin case 128 which is a first case. A case 126 as a second case accommodates the resin case 128. Magnets 129 are provided between the resin case 128 and the case 126, respectively. The magnet 129 provided in the resin case 128 and the magnet 129 provided in the case 126 attract each other.

  As a result, when an impact exceeding the attractive force of the magnets 129 provided on the resin case 128 and the case 126 is applied due to the collision, the resin case 128 is displaced, the power receiving coil 123 is displaced, and then the resin case 128 The power receiving coil 123 can be returned to the original position by the attractive force of the magnets provided on the case 126.

  Further, according to the above-described embodiment, the power receiving coil 123 is displaced due to an impact, but the present invention is not limited to this. It is also conceivable that the power transmission coil 112 is displaced due to impact.

  Further, according to the above-described embodiment, the collision detection device 121 detects a collision based on the current or voltage of the power receiving coil 123 that is displaced due to the collision. However, the present invention is not limited to this. When the power receiving coil 123 is displaced due to a collision, the current or voltage of the power transmission coil 112 as well as the power receiving coil 123 that has been misaligned changes, so that the collision may be detected based on the current or voltage of the power transmission coil 112. .

  Further, according to the above-described embodiment, the electronic device is a device used for a drive recorder, but is not limited thereto. Any electronic device may be used as long as it performs an operation in accordance with vehicle collision detection. For example, the electronic device may be a device for inflating an airbag. In that case, the collision detection device 121 may be provided on the power transmission side, and a collision may be detected based on the current or voltage of the power transmission coil 112.

  Further, according to the above-described embodiment, the electronic apparatus performs an operation corresponding to collision detection such as an airbag or a drive recorder, but is not limited thereto. Any electronic device may be used as long as it is provided separately from the collision detection device 121 and has a function other than the collision detection, and is supplied with power without contact by the power transmission coil 112 and the power reception coil 123.

  Further, according to the above-described embodiment, the collision detection device 121 detects a collision based on the current or voltage of the power receiving coil 123, but the present invention is not limited to this. For example, the position of the power receiving coil 123 may be detected using a position sensor such as an infrared sensor.

  Further, the above-described embodiments are merely representative forms of the present invention, and the present invention is not limited to the embodiments. That is, various modifications can be made without departing from the scope of the present invention.

1 Drive recorder (vehicle equipment)
112 Power transmission coil 121 Collision detection device (collision detection means)
122 Drive recorder internal circuit (electronic equipment, drive recorder equipment)
123 Power receiving coil 126 Case (first case)
127A Spring (elastic member)
127B Power line (elastic member)
127C Elastic shaft (elastic member)
128 Resin case (second case)
129 magnet

Claims (6)

An on-vehicle device comprising: an electronic device mounted on a vehicle; a power transmission coil that supplies power; and a power reception coil that receives power from the power transmission coil in a contactless manner and supplies the power to the electronic device,
The power transmission coil or the power reception coil is composed of a movable coil that is displaced when the vehicle collides,
A vehicle-mounted device, wherein a collision detection means for detecting a collision by detecting a displacement of the movable coil is provided separately from the electronic device. The in-vehicle device according to claim 1, wherein the electronic device is a device that performs an operation according to a detection result of the collision detection unit. The in-vehicle device according to claim 1, wherein the collision detection unit detects a collision based on a current or voltage of the movable coil. The power receiving coil is composed of the movable coil,
The in-vehicle device according to any one of claims 1 to 3, wherein the collision detection unit operates by receiving power supply from the power receiving coil. A case for accommodating the movable coil;
An elastic member that connects the movable coil and the case, and supports the movable coil to the case so that the movable coil can be displaced;
The in-vehicle device according to any one of claims 1 to 4, further comprising: A first case that houses the movable coil;
A second case for accommodating the first case;
A magnet provided in each of the first case and the second case;
The in-vehicle device according to any one of claims 1 to 4, further comprising:

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