JP2010151514A - Vehicular meter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicular meter capable of suppressing a rise in temperature in an accommodation section, particularly, having a small heat capacity in a vehicular meter provided with a plurality of display means. <P>SOLUTION: The vehicular meter includes a first display means 1 for displaying a measurement value on the basis of various information from a vehicle, a first circuit board 2 mounted with electronic components for driving and controlling the first display means 1, a first accommodation section 3 for accommodating the first display means 1 and the first circuit board 2, a second display means 4 for displaying a measurement value having a kind different from that of the first display means 1, a second circuit board 5 mounted with electronic components for driving and controlling the second display means 4, and a second accommodation section 6 that accommodates the second display means 4 and the second circuit board 5 at a portion outside the first accommodation section 3 and has an accommodating volume smaller than that of the first accommodation section 3. The vehicular meter further includes a constant voltage circuit 7 that is mounted to the first circuit board 2, converts a voltage inputted from a power source of the vehicle into a drive voltage for the electronic components of the second circuit board 5 so as to supply it thereto. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a vehicle instrument that is mounted on a vehicle and displays measured values based on various information, and is particularly suitable for a vehicle instrument that separately stores a plurality of display units.

As a conventional vehicle instrument, a plurality of instruments comprising a storage body (storage part) for storing display means for displaying a measured value of a vehicle and a circuit board on which electronic parts for driving and controlling the display means are mounted. For example, it is disclosed in Patent Document 1.
JP 2004-177361 A

  In these vehicular instruments, the heat generated by the electronic component is trapped in the storage body. Therefore, particularly when the storage volume (storage space) of the storage body is small, the heat resistance temperature of the electronic component or the display means is exceeded. Therefore, measures such as providing new parts such as a heat dissipation structure and a heat sink are necessary.

  However, with regard to these countermeasures, particularly in a small instrument, there is a problem that not only the storage capacity serving as the heat capacity is small, but it is also difficult to secure a space for providing heat dissipation components.

  Accordingly, an object of the present invention is to pay attention to the above-described problem, and in a vehicle instrument provided with a plurality of display means, a vehicle instrument that can reduce a temperature rise particularly in a storage portion having a small heat capacity. Is to provide.

  The vehicle meter according to the present invention includes, as described in claim 1, a first display unit that displays a measurement value based on various information from a vehicle, and an electronic device that drives and controls the first display unit. A first circuit board on which components are mounted, a first storage section for storing the first display means and the first circuit board, and different types of measurement values from the first display means. Second display means for displaying, a second circuit board on which an electronic component for driving and controlling the second display means is mounted, and the second display means outside the first storage portion The second circuit board is housed and mounted on the first circuit board, the second housing part having a smaller storage volume than the first housing part, and the voltage from the power source of the vehicle is A constant voltage that is input and converted into a drive voltage to be supplied to an electronic component of the second circuit board It becomes provided with a road, the.

  Further, as described in claim 2, in the vehicle meter according to claim 1, the first storage portion and the second storage portion are integrally formed via a connecting portion. A wiring for supplying a driving voltage from the first circuit board to the second circuit board is provided in the connecting portion.

  According to a third aspect of the present invention, in the vehicular instrument according to the second aspect, the storage space of the first storage portion and the storage space of the second storage portion are communicated in the connection portion. The communication part which provides is characterized by being provided.

  The present invention relates to a vehicular instrument that separately stores a plurality of display units, and can particularly reduce temperature rise in a storage unit having a small heat capacity.

  Hereinafter, an embodiment to which the present invention is applied will be described as an example with reference to the accompanying drawings.

  As shown in FIGS. 1 and 2, the vehicle instrument includes a first display unit 1, a first circuit board 2, a first storage unit 3, a second display unit 4, and a second circuit. A substrate 5, a second storage part 6, a constant voltage circuit 7, and a connecting part 8 are provided.

  The 1st display means 1 is provided so that a user can visually recognize in the instrument panel of a vehicle, and displays a measured value based on the various information from a vehicle. In this case, the first display means 1 includes a pointer-type display unit 11 for indicating and displaying the travel speed of the vehicle and a liquid crystal display panel 12 for displaying the accumulated travel distance. The display unit 11 is compared with a pointer 11b that rotates according to a measured value using the motor 11a as a drive source, and a dial plate 11c that is provided with an index unit such as a scale or a numerical value that is indicated by the pointer. Possible so-called analog instruments can be applied.

  The first circuit board 2 is a wiring for inputting a voltage generated from a power source including a battery or a generator mounted on the vehicle, a wiring for inputting detection signals from various sensors of the vehicle as various information, and the like. Connected to wiring from an external device (not shown). Further, the first circuit board 2 includes a microcomputer 21 that performs arithmetic processing of a control signal for controlling the first display unit 1 according to various information, and a motor 11a for rotationally driving a pointer of the display unit 11. And an electronic component such as a light source 22 for illuminating the liquid crystal display panel 12 and the dial.

  The first storage unit 3 stores the first display means 1 and the first circuit board 2. In this case, the first storage portion 3 is made of a synthetic resin material, and has a transparent window portion 31 made of acrylic or the like so that the display output from the first display means 1 can be seen from the vehicle user, and a light shielding property. It is provided so as to be surrounded by the cases 32 and 33, and is configured so that the first display means 1 and the first circuit board 2 can be held and stored in the storage space S1.

  The second display unit 4 displays different information (different types of measurement values) from the first display unit 1, and in this case, using the liquid crystal display panel, the engine speed, remaining fuel amount, fuel consumption Displays information, outside temperature, etc. by switching screens.

  The second circuit board 5 is connected via a connection member such as a microcomputer 51 that performs arithmetic processing of a control signal for controlling the second display means 4 according to various information, and an anisotropic conductive film. Electronic components such as the second display means 4 (liquid crystal display panel) 4 and the light source 52 that illuminates as the backlight of the second display means 4 are mounted. Further, the second circuit board 5 is provided with a communication line for communicating various information from the vehicle via the first circuit board 2 and a flexible wiring for inputting a driving voltage for the electronic component. The wiring board 9 and the connector 53 are connected.

  The second storage unit 6 stores the second display means 4 and the second circuit board 5. In this case, the second storage unit 6 is provided integrally with the cases 32 and 33 of the first storage unit 3 together with the connecting unit 8. The second storage unit 6 is provided by providing a cutout window 61 so that the display output from the second display means 2 can be seen from the vehicle user, and surrounding the light shielding cases 32 and 33. The second display means 4 and the second circuit board 5 are held and stored in the storage space S2. Further, the storage space S <b> 2 of the second storage unit 6 has a storage volume smaller than the storage space S <b> 1 of the first storage unit 3.

  The constant voltage circuit 7 is mounted on the first circuit board 2, inputs a voltage generated from a power source mounted on the vehicle, and provides a driving voltage for electronic components mounted on the second circuit board 5. is there. In this case, the constant voltage circuit 7 converts the voltage (usually 12 to 14 V) from the power source through a circuit such as a linear regulator into a power source voltage (5 V) for operating electronic components such as the microcomputer 51 and the light source 52. It is supplied with a reduced pressure.

  The connecting portion 8 has the first storage portion 3 and the second storage portion 6 interposed therebetween. In this case, the connection portion 8 is integrally formed with the cases 32 and 33. The connecting portion is provided with a flexible wiring board 9 for connection to the first circuit board 2 and the second circuit board between the case 32 and the case 33, and A communication portion 81 that communicates between the storage space S1 and the storage space S2 of the second storage portion 6 is provided. With this communication portion 81, the flexible wiring board 9 can be wired without being exposed, and the heated air in the narrow storage space S2 can flow toward the storage space S2.

  Such a vehicular instrument is provided with a first display means 1 for displaying measured values based on various information from the vehicle, and a first electronic component for driving and controlling the first display means 1. The circuit board 2, the first display unit 1 for storing the first display unit 1 and the first circuit board 2, and the second display unit for displaying different types of measurement values from the first display unit 1. 4, a second circuit board 5 on which electronic parts for driving and controlling the second display means 4 are mounted, and the second display means 4 and the second circuit board outside the first storage portion 3. 5 is mounted on the first circuit board 2 and the second storage unit 6 having a storage capacity smaller than that of the first storage unit 3, and the voltage from the power source of the vehicle is input. And a constant voltage circuit 7 that converts and supplies the drive voltage to the electronic components on the circuit board 5.

  Therefore, in a vehicle meter provided with a plurality of display means, a constant voltage circuit that is particularly likely to generate heat is disposed on the side of the first storage unit 3 having a large storage volume, and heat generation in the second storage unit 6 having a small storage volume. Therefore, the temperature rise in the storage portion can be reduced without providing a large space for heat dissipation.

  In the first storage part 3 having a relatively large storage capacity in order to store analog instruments as in the above-described embodiment and to provide the thickness of the pointer 11b and the motor 11a and the rotation range of the pointer 11b, the Since the heat capacity is large with respect to the heat generated by the voltage circuit 7 and the electronic components, a rapid temperature rise can be suppressed, and a sufficient space for providing a heat dissipation structure such as a heat sink can be secured.

  Although the vehicular instrument of the present invention has been described as an example in the configuration of the above-described embodiment, the present invention is not limited to this, and other configurations depart from the gist of the present invention. It goes without saying that various improvements and design changes can be made without departing from the scope. For example, the first storage unit 3 and the second storage unit 6 may be provided separately via wiring for electrical connection.

The block diagram which shows the structure of embodiment of this invention. The figure which shows the principal part of embodiment same as the above in a partial cross section.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 1st display means 2 1st circuit board 3 1st accommodating part 4 2nd display means 5 2nd circuit board 6 2nd accommodating part 7 Constant voltage circuit

Claims (3)

First display means for displaying measured values based on various information from the vehicle;
A first circuit board on which an electronic component for driving and controlling the first display means is mounted;
A first storage portion for storing the first display means and the first circuit board;
Second display means for displaying different types of measurement values from the first display means;
A second circuit board on which an electronic component for driving and controlling the second display means is mounted;
A second storage section for storing the second display means and the second circuit board outside the first storage section, and having a storage volume smaller than that of the first storage section;
A constant voltage circuit that is mounted on the first circuit board, inputs a voltage from a power source of the vehicle, converts the voltage into a drive voltage to be supplied to an electronic component of the second circuit board, and
An instrument for a vehicle, comprising: The first storage part and the second storage part are integrally formed via a connecting part,
The vehicular instrument according to claim 1, wherein a wiring for supplying a driving voltage from the first circuit board to the second circuit board is provided in the connecting portion.   The vehicular instrument according to claim 2, wherein a communication portion that connects the storage space of the first storage portion and the storage space of the second storage portion is provided in the connection portion. .

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