JP5549278B2 - Vehicle switch - Google Patents

Description

  The present invention relates to a vehicular switch that is mainly used for controlling the extinction of a stop lamp when operating a brake pedal of an automobile.

  In recent years, a push-operated type vehicle switch is mainly used for controlling the stop lamp accompanying the operation of the brake pedal. The stop lamp is turned on when the brake pedal is depressed and turned off when the brake pedal is released. ing.

  Such a conventional vehicle switch will be described with reference to FIGS.

  FIG. 6 is a cross-sectional view of a conventional vehicle switch. In FIG. 6, reference numeral 1 denotes a substantially box-shaped case with an opening on the upper surface, and an insulating resin case. The magnet 3 is mounted on the lower right side of the operating body 2.

  Reference numeral 4 denotes a plurality of terminals made of conductive metal, 5 denotes a wiring board having a plurality of wiring patterns (not shown) formed on both sides, and the wiring board 5 is arranged on the right side wall of the case 1 and The upper ends of the terminals 4 are connected to the wiring pattern of the wiring board 5 by soldering or the like, and the lower ends of the terminals 4 protrude downward from the bottom surface of the case 1.

  Further, a detection means 6 such as a Hall element is formed on the surface of the wiring board 5 facing the magnet 3, and a control means 8 comprising an IC or the like in which a switching unit 8A such as a semiconductor switch is integrally formed is formed on the opposite surface. Has been.

  An electrode is provided on the lower surface of the control means 8, and this electrode abuts against the surface of the heat radiating plate 7 made of copper foil affixed to the right side surface of the facing wiring board 5 and extends from the side surface of the control means 8. The terminals (not shown) are soldered to the wiring pattern, and the control means 8 is mounted on the wiring board 5.

  Furthermore, various electronic components such as capacitors, resistors, and diodes are mounted on both surfaces of the wiring board 5, and the detection means 6, the control means 8, the terminal 4, and various electronic components are electrically connected via the wiring pattern.

  9 is a coiled return spring, 10 is an insulating resin cover that covers the opening on the upper surface of the case 1, and the return spring 9 is slightly bent between the lower surface of the operating body 2 and the bottom surface of the case 1. The vehicle switch 11 is configured by being mounted and biasing the operating body 2 upward, and the upper end of the operating body 2 projecting upward from the hollow cylindrical portion at the center of the upper surface of the cover 10.

  Further, as shown in the side view of the main part of FIG. 5, the vehicle switch 11 configured in this way is generally mounted in front of the brake pedal 30 of the automobile in a state where the tip of the operating body 2 is pressed by the arm 30A. At the same time, a plurality of terminals 4 protruding from the bottom surface of the case 1 are connected to a stop lamp 32, a battery 33, and an electronic circuit (not shown) made up of a plurality of light emitting diodes (hereinafter referred to as LEDs) by connectors 31 and lead wires. Etc.).

  That is, when the brake pedal 30 is not depressed, the operating body 2 is pressed downward while bending the return spring 9, and the magnet 3 mounted on the right side of the operating body 2 also moves downward. The center of the detection means 6 arranged opposite to the center is greatly separated, and the magnetism of the magnet 3 detected by the detection means 6 is weak.

  The detecting means 6 outputs an ON signal to the control means 8 when the magnetism is not less than a predetermined value depending on the strength of the detected magnetism, and the control means 8 closes the switching unit 8A in accordance with this output signal. On the other hand, when the magnetism is below a predetermined value, an OFF signal is output to the control means 8, and the control means 8 opens the switching portion 8A. In this state, the switching unit 8A is open and the stop lamp 32 is extinguished.

  When the brake pedal 30 is depressed, the arm 30A is separated from the tip of the operating body 2 and the pressing force is removed, so that the operating body 2 moves upward by the elastic return force of the return spring 9, as shown in FIG. At the same time, the magnet 3 attached to the operating body 2 also moves upward so that the magnet 3 and the detection means 6 face each other, and the magnetism of the magnet 3 detected by the detection means 6 becomes stronger. The part 8A is switched to the closed state, and the stop lamp 32 is lit.

  As described above, the operation body 2 of the vehicle switch 11 is moved up and down by the operation of the brake pedal 30, and the magnetism of the magnet 3 on the right side surface of the operation body 2 is detected by the detection means 6, and the output from the detection means 6 In response to the signal, the control unit 8 opens and closes the switching unit 8A to control the extinction of the stop lamp 32.

  When the stop lamp 32 is lit, the control means 8 is energized with a DC 12 V · 2-3 A current by the stop lamp 32 made up of a plurality of LEDs, etc., so that the control means 8 generates heat and has a temperature of 50-60 degrees. May rise.

  Therefore, for example, when the ambient temperature of the vehicle switch 11 becomes a high temperature state of 80 ° C. or more, the temperature of the control means 8 rises to 130 ° C. or more including heat generation, and the control means 8 itself or the opposite surface is raised. There is a possibility that a certain detecting means 6 becomes high temperature and troubles in these operations.

  Further, in order to suppress the temperature rise due to the heat generated by the control means 8, the heat dissipation can be improved by making the heat dissipation plate 7 in contact with the control means 8 to have a larger area. There is no space for expanding the heat sink 7 with a large number of electronic components mounted thereon, and when the entire wiring board 5 is further enlarged, the vehicle switch 11 becomes large.

  As prior art document information related to the invention of this application, for example, Patent Document 1 is known.

JP 2009-51274 A

  However, in the conventional vehicle switch 11, the heat radiation plate 7 provided on the wiring board 5 has a larger area in order to suppress the temperature rise due to the heat generated by the control means 8 when the stop lamp 32 is opened and closed. There is a problem that the vehicle switch 11 becomes large.

  The present invention solves such a conventional problem, and an object thereof is to provide a vehicle switch that is small in size, has good heat dissipation, and can reliably operate even at high temperatures.

In order to achieve the above object, according to the first aspect of the present invention, a wiring board provided with detection means and control means is formed of a multilayer board, and an external heat sink is provided on at least one of the front surface and the back surface of the wiring board. At the same time, an internal heat sink is provided between the substrates on which the wiring boards are stacked, and the external heat sink and the internal heat sink are connected to each other through the connection portion formed on the inner surface of the through hole that penetrates the wiring board. Is a switch for a vehicle provided with a cutout in a range larger than the projection range of the detection means , and wiring is provided by overlapping a plurality of heat sinks connected by connecting portions of through holes. Since the substrate can be made to have a larger heat dissipation area with a small area, the heat generated in the control means is radiated through a plurality of heat dissipation plates, and the temperature rise of the control means itself and the detection means is suppressed, Miniaturization is figure , Good heat dissipation of the circuit board, an effect that can be obtained a vehicle switch capable of reliable operation even at high temperatures.
Furthermore, since the internal heat sink is provided with a notch in a range larger than the projection range of the detection means, the internal heat sink does not overlap and is separated from the detection means directly below the detection means. The heat transmitted to the plate is difficult to be transmitted to the detection means via the second substrate or the third substrate by the notch, and the temperature rise of the detection means can be further suppressed.

  The invention according to claim 2 is the invention according to claim 1, wherein the upper surface opening of the substantially box-shaped case is covered with a cover, and an external heat radiating plate and a control means are provided on the surface opposite to the detection means of the wiring board, A holding portion is provided on the lower surface of the cover and the inner surface of the case, and the outer peripheral portion of the wiring board is held by the holding portion, and the control means mounted on the surface opposite to the detecting means is partitioned by the holding portion and the wiring board, Heat generated from the control means is radiated to the space on the control means side via the external heat sink or internal heat sink, but it is difficult to transmit to the detection means side, and the temperature rise of the detection means can be further suppressed, so that more reliable operation is possible. It has the effect that it can be made possible.

  As described above, according to the present invention, there is an advantageous effect that it is possible to realize a vehicle switch that is small in size, has good heat dissipation of the wiring board, and can operate reliably even at high temperatures.

Sectional drawing of the switch for vehicles by one embodiment of this invention Enlarged sectional view of the main part Exploded perspective view of the main part Sectional view according to another embodiment Side view of the main part of the brake pedal Sectional view of a conventional vehicle switch

  Embodiments of the present invention will be described below with reference to FIGS.

  In addition, the same code | symbol is attached | subjected to the part of the structure same as the structure demonstrated in the term of background art, and detailed description is simplified.

(Embodiment)
FIG. 1 is a cross-sectional view of a vehicle switch according to an embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a substantially box-shaped case having an upper surface opening, and a case made of an insulating resin such as polybutylene terephthalate. A magnet 3 is mounted on the lower right side of the actuating body 2 such as polyoxymethylene accommodated in a vertically movable manner.

  4 is a plurality of terminals made of a conductive metal such as a copper alloy, 15 is a wiring board which is a so-called multilayer board in which a plurality of wiring patterns (not shown) are formed on both surfaces, and a plurality of boards are laminated, The wiring board 15 is disposed on the right side wall of the case 1, the upper ends of the terminals 4 are connected to the wiring pattern of the wiring board 15 by soldering or the like, and the lower ends of the terminals 4 protrude downward from the bottom surface of the case 1. Yes.

  Here, the details of the wiring board 15 will be described with reference to a cross-sectional view of main parts in FIG. 2 and an exploded perspective view of main parts in FIG.

  That is, in the figure, 15A is a first substrate made of an insulating resin such as an epoxy resin containing glass, and is formed on a right side surface of the first substrate 15A by a conductive metal plate etched into a substantially rectangular shape such as a copper foil. A first external heat dissipation plate 16A is provided.

  15B is also a second substrate made of an insulating resin, and the right and left sides of the second substrate are made of a conductive metal plate and etched to form an approximately U-shaped notch. A first internal heat dissipating plate 16B and a second internal heat dissipating plate 16C are provided in which 16X and 16Y are formed to face each other.

  15C is also a third substrate made of insulating resin, and a second external heat radiation plate 16D made of a substantially rectangular conductive metal plate and etched is provided on the left side surface of the third substrate.

  Further, the second substrate 15B is fixed between the first substrate 15A and the third substrate 15C by an adhesive sheet, an adhesive, or the like, and between the first external heat dissipation plate 16A on the right side and the second external heat dissipation plate 16D on the left side. A plurality of through-holes 15D are formed, and connection portions 15E are formed on the inner surface of the through-hole 15D by copper plating, copper paste, or the like.

  The first external heat radiating plate 16A, the first internal heat radiating plate 16B, and the second external heat radiating plate 16D are connected to each other by the connecting portion 15E.

  In addition, a long hole 16Z whose inner periphery is spaced apart from the connecting portion 15E of the plurality of through holes 15D arranged in a row is provided at the lower part of the second internal heat radiating plate 16C. It is not directly connected to the connection unit 15E.

  The first and second internal heat sinks 16B and 16C have a larger area than the first and second external heat sinks 16A and 16D, and these heat sinks are arranged so as to overlap each other in the thickness direction of the wiring board 15, A substrate 15 is configured.

  Further, as shown in FIG. 1, the detection means 6 such as a Hall element is formed on the surface of the wiring board 15 facing the magnet 3, and the switching unit 8A such as a semiconductor switch is integrally formed on the opposite surface. Each of the control means 8 is formed.

  The first external heat sink 16A is connected to the power supply side pattern of the wiring board 15, and the second internal heat sink 16C is connected to the ground side pattern, and is provided on the lower surface of the control means 8 as shown in FIG. The electrode 8B is in contact with the first external heat radiating plate 16A of the opposing wiring board 15, and a plurality of terminals extending from the side surface of the control means 8 are soldered to the wiring pattern, so that the control means 8 is attached to the wiring board 15. Has been implemented.

  Furthermore, various electronic components such as capacitors, resistors, and diodes are mounted on both surfaces of the wiring board 15, and the detection means 6, the control means 8, the terminal 4, and various electronic components are electrically connected via the wiring pattern.

  9 is a coiled return spring, 10 is an insulating resin cover that covers the opening on the upper surface of the case 1, and the return spring 9 is slightly bent between the lower surface of the operating body 2 and the bottom surface of the case 1. The vehicle switch 21 is configured by being mounted and biasing the operating body 2 upward, and the upper end of the operating body 2 protruding upward from the hollow cylindrical portion at the center of the upper surface of the cover 10.

  Further, as shown in the side view of the main part of FIG. 5, the vehicular switch 21 thus configured is generally mounted in front of the brake pedal 30 of the automobile in a state where the tip of the operating body 2 is pressed by the arm 30A. At the same time, the plurality of terminals 4 protruding from the bottom surface of the case 1 are connected to a stop lamp 32, a battery 33, and an electronic circuit (not shown) of the vehicle by a connector 31 and a lead wire.

  A power source is connected from the battery 33 to the input side of the switching unit 8A of the control means 8 via the terminal 4, the wiring board 15, the first external heat sink 16A, the electrode 8B, etc., and the output side of the switching unit 8A is connected to the output side. The control lamp 8 is connected to the stop lamp 32 via a terminal extended to the side surface, the wiring board 15, the terminal 4, and the like.

  When the brake pedal 30 is not depressed, the operating body 2 is pressed downward while bending the return spring 9, and the magnet 3 mounted on the right side surface of the operating body 2 also moves downward. The center of the detection means 6 arranged opposite to the center is greatly separated, and the magnetism of the magnet 3 detected by the detection means 6 is weak.

  The control means 8 connected to the detection means 6 outputs an ON signal to the control means 8 when the magnetism is not less than a predetermined value due to the strength of the magnetism detected by the detection means 6. 8 closes the switching unit 8A in response to the output signal. On the other hand, if the magnetism is below a predetermined value, the control unit 8 outputs an OFF signal to the control unit 8, and the control unit 8 opens the switching unit 8A. Therefore, in a state where the operating body 2 is pressed, the switching unit 8A is in an open state, and the stop lamp 32 is turned off.

  When the brake pedal 30 is depressed, the arm 30A is separated from the tip of the operating body 2 and the pressing force is removed, so that the operating body 2 moves upward by the elastic return force of the return spring 9, as shown in FIG. At the same time, the magnet 3 attached to the operating body 2 also moves upward so that the magnet 3 and the detection means 6 face each other, and the magnetism of the magnet 3 detected by the detection means 6 becomes stronger, so that the control means 8 switches. The part 8A is switched to the closed state, and the stop lamp 32 is lit.

  In this way, by operating the brake pedal 30, the operating body 2 of the vehicle switch 21 is moved up and down, and the magnetism of the magnet 3 on the right side surface of the operating body 2 is detected by the detecting means 6, and the output from the detecting means 6 In response to the signal, the control unit 8 opens and closes the switching unit 8A to control the extinction of the stop lamp 32.

  When the stop lamp 32 is lit, the control means 8 is energized with a current of DC 12 V · 2 to 3 A by the stop lamp 32 composed of a plurality of LEDs, etc., and the control means 8 generates heat and has a temperature of several tens of degrees or more. To rise.

  However, at this time, the heat generated in the control means 8 is transmitted to the first external heat radiating plate 16A in contact with the lower surface of the control means 8, and the connection portions 15E provided in the plurality of through holes 15D penetrating the wiring board 15. Through the first internal heat radiation plate 16B and the second external heat radiation plate 16D on the opposite side of the control means 8, and dissipated from each heat radiation plate, the control means 8 itself and the surrounding temperature The rise is suppressed.

  That is, the control is performed by the heat sinks of the first and second external heat sinks 16A and 16D on the left and right side surfaces of the wiring board 15 and the first internal heat sink 16B between the stacked boards connected via the connection portion 15E. Since the heat generated by the means 8 is directly radiated, even when the vehicle switch 21 is used at a relatively high temperature, the control means 8 and the detecting means 6 are prevented from becoming excessively high temperature, and their normal operation Can be secured.

  Further, since the second internal heat dissipation plate 16C is connected to the ground and is not directly connected to the connection portion 15E, the second internal heat dissipation plate 16B and the second external heat dissipation plate 16D to the second substrate 15B and the third substrate 15C. Since the heat transmitted through the heat is dissipated by the second internal heat dissipating plate 16C, the heat dissipating property of the wiring board 15 can be improved.

  Further, the cutout portion 16X and the cutout portion 16Y provided in the first internal heat dissipation plate 16B and the second internal heat dissipation plate 16C are notches in a range larger than the projection range of the detection means 6 on the third substrate 15C. 6, the first and second internal heat dissipation plates 16B and 16C do not overlap and are separated from each other, so that the heat transmitted from the control means 8 to the first and second internal heat dissipation plates 16B and 16C is notched. 16X and 16Y are not easily transmitted to the detection means 6 via the second substrate 15B or the third substrate 15C, and the temperature rise of the detection means 6 can be further suppressed.

  Thus, according to the present embodiment, the wiring board 15 provided with the detecting means 6 and the control means 8 is formed of a multilayer board, and the first and second external heat radiation plates 16A and 16D are formed on both surfaces of the wiring board 15. The first internal heat dissipating plate 16B is provided between the substrates on which the wiring substrate 15 is laminated, and the first external heat dissipating plate 16A or the like is formed by the connecting portion 15E formed on the inner surface of the through hole 15D penetrating the wiring substrate 15. By connecting the first internal heat radiating plate 16B and the second external heat radiating plate 16D, a plurality of connected heat radiating plates are arranged so as to overlap each other, so that the wiring board 15 has a larger heat radiating area even if it has a small area. The heat generated in the control means 8 is dissipated through a plurality of heat radiating plates, and the temperature rise of the control means 8 itself and the detection means 6 is suppressed, so that the size can be reduced and the heat dissipation of the wiring board 15 can be achieved. Is good and smells under high temperature It is possible to realize a vehicle switch capable also reliable operation.

  In the above description, the wiring board 15 is a so-called multi-layer board of a so-called four-layer board in which the first to third boards 15A to 15C and four layers such as wiring patterns are provided on both outer surfaces and between the boards. As described above, the wiring board is a five-layer board or more, a heat sink is provided between both sides and the laminated board, a through-hole penetrating the wiring board and a connecting portion are formed on the inner surface thereof, By connecting the heat radiating plate, although it becomes somewhat expensive, the heat radiating plate is further increased and the heat radiating effect can be enhanced.

  Further, in the above description, the first and second external heat radiation plates 16A and 16D are provided on both surfaces of the wiring board 15, and the first internal heat radiation plate 16B is provided inside, and these 3 are formed by the connection portion 15E of the through hole 15D. Although it has been described that two heat sinks are connected, for example, when there is no space for disposing the heat sink on the left side surface of the wiring board 15, the heat dissipation is somewhat inferior, but the first external heat sink 16A and It is good also as a structure which provided the 1st internal heat sink 16B, respectively, and connected these two heat sinks by the connection part 15E.

  Further, as shown in the cross-sectional view of FIG. 4, a holding portion 22 </ b> A that protrudes downward in a substantially U-shape is integrally formed on the lower surface of the cover 10 that covers the upper surface opening of the case 1. A holding portion 22B having a substantially U-shaped cross section is provided on the inner side surface in the front-rear direction, the outer peripheral portion at the upper end of the wiring board 15 is held in the holding portion 22A, and the outer peripheral portions at the lower end and the front and rear ends are held in the holding portion 22B. 3 and the space on the left side surface of the wiring board 15 on which the detection means 6 is mounted and the space on the right side surface on which the control means 8 is mounted are made difficult to transmit heat generated by the control means 8 to the detection means 6. be able to.

  That is, on the right side surface, which is the opposite surface to the detection means 6 mounted on the wiring board 15, the first external heat radiating plate 16A and the first internal heat radiating plate 16B connected to this by the connecting portion 15E on the inner side surface of the through hole 15D. The control means 8 is mounted in contact with the first external heat radiating plate 16A, the outer peripheral portion of the wiring board 15 is held by the holding portions 22A and 22B made of insulating resin, and the wiring board 15 is attached to the left and right side surfaces. The heat generated by the control means 8 is radiated to the right side of the wiring board 15 by the first external heat radiating plate 16A and the first internal heat radiating plate 16B. Heat generated by the control means 8 is difficult to be transmitted to the space on the left side divided by the holding portions 22A and 22B, and heat transfer to the detection means 6 can be further reduced.

  Therefore, the control means 8 itself operates at a higher temperature than the control means 8 even when the stop lamp 32 is frequently turned on under high temperature conditions, for example, when driving in a traffic jam, and the temperature rises to around 130 degrees. For example, the detection means 6 that is likely to cause trouble is difficult to directly transmit the heat generated by the control means 8 and the temperature rise of the detection means 6 is further suppressed, so that the operation of the detection means 6 can be further ensured. .

  In the above description, the holding portion 22A is integrally provided on the lower surface of the cover 10, and the holding portion 22B is integrally provided on the bottom surface and the inner side surface of the case 1, so that the upper and lower and front and rear outer peripheral portions of the wiring board 15 are held. As described above, the holding portion 22A and the holding portion 22B are provided separately from the cover 10 and the case 1, and these are mounted on the outer peripheral portion of the wiring board 15, and the bottom surface of the cover 10, the bottom surface of the case 1, and the front and back inner surfaces It may be configured so as to partition the space on the left and right side surfaces of the wiring substrate 15 so as to be in contact with each other.

  The vehicle switch according to the present invention is small, has good heat dissipation of the wiring board, and can obtain a vehicle switch capable of reliable operation even at high temperatures, mainly for turning on / off control of an automobile stop lamp, etc. Useful as.

DESCRIPTION OF SYMBOLS 1 Case 2 Actuator 3 Magnet 4 Terminal 6 Detection means 8 Control means 8A Switching part 8B Electrode 9 Return spring 10 Cover 11, 21 Vehicle switch 15 Wiring board 15A First board 15B Second board 15C Third board 15D Through hole 15E Connection part 16A 1st external heat sink 16B 1st internal heat sink 16C 2nd internal heat sink 16D 2nd external heat sink 16X, 16Y Notch 16Z Long hole 21 Vehicle switch 22A, 22B Holding part 30 Brake pedal 30A Arm 31 Connector 32 Stop lamp 33 Battery

Claims (2)

A substantially box-shaped case, an operating body accommodated in the case so as to be movable up and down, a magnet mounted on the operating body, a wiring board disposed in the case, and a wiring board formed on the wiring board. A detecting means for detecting the magnetism of the magnet and a control means for opening and closing the switching unit in accordance with an output signal from the detecting means, wherein the wiring board is formed of a multilayer board, and the front and back surfaces of the wiring board An external heat sink is provided on at least one of the wiring boards, and an internal heat sink is provided between the substrates on which the wiring boards are stacked, and the external heat sink is formed by a connecting portion formed on an inner surface of a through-hole penetrating the wiring board. The internal heat dissipation plate is connected , and the internal heat dissipation plate is provided with a cutout in a range larger than the projection range of the detection means . The upper surface opening of the substantially box-shaped case is covered with a cover, an external heat radiation plate and a control means are provided on the surface opposite to the detection means of the wiring board, and a holding part is provided on the lower surface of the cover and the inner surface of the case. The vehicle switch according to claim 1, wherein an outer peripheral portion of the vehicle is held by the holding portion.

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