JP2013163507A - Airbag starting electronic circuit device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To confirm a capacitor installed in a housing without spending time and giving the damage, even if there is no inspection device such as a checker or the like without detaching a back cover.SOLUTION: An airbag starting electronic circuit device includes: a resin housing 1 that has a mounting part 1a to a vehicle; an electronic circuit board 4 with a built-in control circuit; a capacitor 3 where electricity is saved; a back cover 5 installed in the housing 1 to isolate the electronic circuit board 4 installed in the housing 1, and a capacitor 3 from the external; and a connecting connector 2. An opening 1e is installed in the housing 1 to peep at the capacitor 3 from the external, and this opening 1e is covered with a resin sheet 6 that is better than the housing 1 in thermal conductivity. The visual inspection of the capacitor installed inside of the housing can be done from the opening. The heat originating from the capacitor is emitted from a resin member installed in the opening, and thermal deterioration of the capacitor can be improved.

Description

  The present invention relates to an airbag activation electronic circuit device that electrically controls activation of an airbag installed in an automobile as a safety device.

  The airbag device protects an occupant from an impact at the time of collision by ejecting gas at the time of collision and deploying the airbag. The airbag device is electrically controlled for activation by an airbag activation electronic circuit device.

  This airbag activation electronic circuit device has a configuration in which an electronic circuit board and a capacitor for storing electricity for supplying current to the squib of the inflator when the airbag is activated are mounted in the housing. The electronic circuit board incorporates a control circuit that determines a vehicle collision based on the acceleration or deceleration detected by the sensor, and outputs a control signal for deploying the airbag when the collision is determined.

  By the way, the conventional air bag activation electronic circuit device cannot see the inside of the housing as shown in FIG. 5 after the electronic circuit board and the capacitor are attached inside the housing and covered with the back cover (for example, patent Reference 1). In FIG. 5, 1 is a housing, and 2 is a connector for connecting to a wire harness.

  Therefore, when checking for assembly errors on the production line, such as whether you have forgotten to attach a capacitor to the housing, or whether there is a mistake in the installed capacitor, remove the back cover once and indicate the presence or absence of the capacitor. It is necessary to visually inspect identification characters such as the capacity and the withstand voltage value. Alternatively, it is necessary to perform an inspection by electrical continuity by connecting a checker or the like.

  However, when the back cover is reattached after removing the back cover and visually inspecting, the inspection time becomes long and there is a risk of damaging the product when the back plate is reattached. Further, the electrical continuity test requires a separate inspection device such as a checker.

JP 2003-260992 A

  A problem to be solved by the present invention is a method of visually inspecting a back cover when inspecting an assembly error on a production line, such as whether or not a capacitor is forgotten to be attached or whether an attached capacitor is correct. Is that the inspection time becomes longer and the product may be damaged when the back plate is attached. In addition, the electrical continuity test requires a separate inspection device such as a checker.

  Even if there is no inspection device such as a checker, the airbag start electronic circuit device of the present invention does not require a long time to check whether the capacitor is forgotten to be attached or whether the capacitor attached to the housing is correct. The purpose is to do without damaging.

That is, the airbag activation electronic circuit device of the present invention is
A resin housing having a mounting portion to the vehicle;
An electronic circuit board incorporating a control circuit that outputs a control signal for starting the airbag;
A capacitor that stores electricity to supply current to the inflator squib when the airbag is activated;
A back cover attached to the housing for isolating the electronic circuit board and the capacitor attached to the inside of the housing from the outside;
A connector for connecting to a wire harness;
Comprising
The main feature is that an opening is provided in the housing so that the capacitor attached to the inside of the housing can be seen from the outside, and a resin member having a higher thermal conductivity than the housing is provided in the opening. It is said.

  In the present invention, since the opening portion is provided in the housing so that the capacitor attached to the inside of the housing can be seen from the outside, the capacitor attached to the inside of the housing from the opening portion can be visually inspected. In addition, in the present invention, since the resin member having better thermal conductivity than the housing is provided in the opening, the heat generated from the capacitor is released from the resin member provided in the opening, thereby improving the thermal deterioration of the capacitor. Can do.

  The resin member is preferably a transparent material in order to look into the capacitor mounted inside the housing. Here, the term “transparency” means that it is possible to determine whether or not an object is barely present inside the housing from the one having a visible light transmittance that allows a person with normal vision to see the inside of the housing well. Including those that are of a degree of transparency.

  In the present invention, since the opening is provided in the housing so that the capacitor attached to the inside of the housing can be seen from the outside of the housing, the capacitor accommodated in the inside of the housing can be visually inspected from the opening. it can.

  In addition, in the present invention, since the resin member having better thermal conductivity than the housing is provided in the opening, the heat generated from the capacitor is released from the resin member provided in the opening, thereby improving the thermal deterioration of the capacitor. Can do.

It is the disassembled perspective view of the airbag starting electronic circuit apparatus of this invention which looked at the state which attached the capacitor | condenser inside the housing from the attachment side of the back cover. It is the perspective view which looked at the air bag starting electronic circuit device of the present invention from the top side. It is the perspective view which looked at the other example of the airbag starting electronic circuit device of this invention from the top | upper surface side. It is the perspective view which looked at the further another example of the airbag starting electronic circuit device of this invention from the top | upper surface side. It is the perspective view which looked at the conventional airbag starting electronic circuit device from the top side.

  The present invention enables the confirmation of the capacitor accommodated in the housing part without taking time and without damaging it without removing the back cover and without an inspection device such as a checker. It is intended.

  And the objective was implement | achieved by providing the opening part in a housing so that a capacitor | condenser can be seen from the exterior of a housing, and providing the resin member with better heat conductivity than this housing in this opening part.

Hereinafter, an embodiment for carrying out the present invention will be described with reference to FIGS.
Reference numeral 1 denotes a resin housing, which is formed in a box shape having an open bottom surface 1a and one side surface 1b. In the present invention, vehicle mounting portions 1c are provided at, for example, three corners on the outer peripheral side of the opening provided on the bottom surface 1a of the housing 1.

  A capacitor 3 for storing electricity for supplying a current to the squib of the inflator when the airbag is started is attached inside the housing 1. As shown in FIG. 1, the capacitor 3 is attached in contact with the housing 1 by ribs 1 d provided inside the housing 1.

  An electronic circuit board 4 is also accommodated in the housing 1 (see FIG. 1). The electronic circuit board 4 incorporates a control circuit that determines whether or not the vehicle has collided based on the acceleration or deceleration detected by the sensor, and outputs a control signal for deploying the airbag when it is determined to be a collision. Yes.

  After the electronic circuit board 4 and the capacitor 3 are accommodated in the housing 1, the connector 2 for connecting to the wire harness is attached to the opening of the one side surface 1 b (see FIG. 2), and the back cover 5 The opening of the bottom surface 1a of the housing 1 is covered. As a result, the electronic circuit board 4 and the capacitor 3 are isolated from the outside.

  In the present invention, openings 1e are provided at, for example, three locations on the top surface of the housing 1 located immediately above the position where the capacitor 3 is arranged so that the capacitor 3 inside the housing 1 can be seen from the outside. The color, capacity, and withstand voltage identification characters can be checked.

  In addition, in the present invention, these openings 1e are covered with a transparent resin sheet 6 from the outside of the top surface, for example. The resin sheet 6 may not be transparent or may be translucent as long as the capacitor 3 attached inside the housing 1 can be confirmed from the opening 1e.

  However, when the capacitor 3 is attached to the housing 1 as in the present invention example, heat is trapped inside the housing 1, so that the heat can be released to the outside through the opening 1e. A material having good thermal conductivity, for example, silicon is employed. The silicon resin sheet 6 can ensure a certain degree of rigidity.

  In the present invention having the above-described configuration, it is possible to check whether the capacitor 3 has been attached from the opening 1e provided in the housing 1 and to check the attached capacitor 3 without taking time, even without an inspection device such as a checker. Visual inspection can be performed without giving.

  In addition, in the present invention, since the opening 1e is covered with the resin sheet 6 having a heat conductivity higher than that of the housing 1, the heat generated from the capacitor 3 is released from the resin sheet 6 covering the opening 1e, and the capacitor 3 It is possible to improve the thermal deterioration of the resin and improve durability.

  Further, since a caution label is usually attached to the top surface of the housing 1 in the airbag start electronic circuit device, instead of the resin sheet 6, as shown in FIG. 3, the opening 1e is covered. For example, a transparent caution label 7 may be attached.

  The present invention is not limited to the above examples, and the embodiments may be appropriately changed as long as they are included in the scope of the technical idea described in each claim.

  That is, the airbag activation electronic circuit device described above is a preferable example of the present invention, and other embodiments can be implemented or performed by various methods. In particular, the present invention is not limited to the detailed shape, size, configuration, and the like of the components shown in the accompanying drawings unless otherwise specified in the present specification. In addition, expressions and terms used in the present specification are for the purpose of explanation, and are not limited thereto unless specifically limited.

  For example, in the above example, the opening 1e of the housing 1 is covered with the transparent resin sheet 6 or the transparent caution label 7. However, as shown in FIG. For example, the resin 8 having transparency may be embedded.

  Further, the transparent resin sheet 6 covering the opening 1e or the transparent caution label 7 and the transparent resin 8 embedded in the opening 1c, the transparent resin sheet 6, and the transparent caution label are provided. 7 and resin 8 may be provided.

  Further, in the above example, the openings 1e are provided at three positions so that the identification characters of the capacitance and the withstand voltage value can be confirmed in addition to the color of the capacitor 3. However, it is also possible to confirm these by one opening 1e. good.

  The present invention described above is not limited to a device that activates deployment of an airbag, but is effective for any device as long as it is a device that includes a resin housing 1 that houses a device that generates heat, such as a capacitor. is there.

DESCRIPTION OF SYMBOLS 1 Housing 1c Mounting part 1d Rib 1e Opening 2 Connector 3 Capacitor 4 Electronic circuit board 5 Back cover 6 Resin sheet 7 Caution label 8 Resin

Claims (8)

A resin housing having a mounting portion to the vehicle;
An electronic circuit board incorporating a control circuit that outputs a control signal for starting the airbag;
A capacitor that stores electricity to supply current to the inflator squib when the airbag is activated;
A back cover attached to the housing for isolating the electronic circuit board and the capacitor attached to the inside of the housing from the outside;
A connector for connecting to a wire harness;
Comprising
An air is provided with an opening in the housing so that the capacitor attached to the inside of the housing can be seen from the outside, and a resin member having a heat conductivity higher than that of the housing is provided in the opening. Bag activation electronic circuit device.   The air bag activation electronic circuit device according to claim 1, wherein the resin member is a transparent material.   The airbag activation electronic circuit device according to claim 1, wherein the resin member is a resin sheet that covers the opening.   4. The airbag activation electronic circuit device according to claim 3, wherein the resin sheet is a caution label.   The airbag activation electronic circuit device according to any one of claims 1 to 3, wherein a caution label is attached so as to cover the opening.   6. The airbag activation electronic circuit device according to claim 1, wherein a resin having a thermal conductivity higher than that of the housing is embedded in the opening.   The airbag activation electronic circuit device according to claim 6, wherein the resin is a transparent material.   The airbag activation electronic circuit device according to any one of claims 1 to 7, wherein the capacitor is attached to a rib provided inside the housing in contact with the housing.

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