JPH048335Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention is for storing a circuit board with electrical components assembled in a protective cover, and attaching this protective cover to the outside of an instrument housing such as a vehicle instrument. It concerns fixed structures.

[Conventional technology]

Generally, the instrument housing includes a speedometer with a speed alarm function, an engine tachometer, and a fuel gauge.
Instruments that indicate vehicle driving conditions, such as a water temperature gauge, or central warning devices that centrally display various vehicle conditions, such as oil pressure status, door opening/closing status, handbrake operation status, and headlight lighting status. These electric meters, display devices such as central warning devices, lighting lamps, etc. are supplied with power from the vehicle's battery via electrical cords.

In that case, a flexible printed wiring board on which a predetermined conductive circuit pattern is formed is attached to the back surface of the meter housing, the electrical cord is electrically connected to the flexible printed wiring board, and the electrical meter is connected from the flexible printed wiring board to the flexible printed wiring board. It is electrically connected to lighting equipment such as display equipment and lamps.

Furthermore, on the back side of the instrument case, for example, a circuit board that drives a speed alarm function provided in a speedometer, that is, a speed alarm device assembled with electrical parts, is fixed. In order to protect the circuit board from external contact and impact, the circuit board is sealed inside a protective cover, or the circuit board is stored inside a bowl-shaped protective cover that is open at the bottom. This protective cover is attached and fixed to the instrument housing.

[Problem that the invention attempts to solve]

By the way, a protective cover is usually installed on the back side of the instrument housing and fixed by tightening with screws or the like that serve as fixing parts. Therefore, assembly is time consuming and workability is difficult.

In addition, when a flexible printed wiring board is routed and arranged on the back side of the instrument housing, it must be routed and placed according to the level difference in the instrument housing, and it may float due to the level difference in the instrument housing. The raised flexible printed wiring board may bend locally or come into contact with other equipment and break the wire, causing inconvenience.

[Means for solving problems]

This idea solves the above problem by routing and arranging a flexible printed wiring board with a predetermined conductive circuit pattern formed on the back side of the instrument housing, and connecting the circuit board with electrical components to a synthetic resin board. The housing is housed in a protective cover, and the protective cover is fixed to the outside of the instrument housing, wherein a locking pin is integrally provided on the meter housing and is positioned to fit into the locking pin. A hole is provided in the flexible printed wiring board, and a positioning hole is provided in the protective cover to regulate the attachment position of the protective cover, and the positioning hole provided in the flexible printed wiring board is inserted into the locking pin to regulate the position. In addition, the protective cover is characterized in that the position is set by inserting a position setting hole provided in the protective cover into the locking pin.

〔Example〕

An embodiment based on the above characteristics will be described with reference to the accompanying drawings.

Figures 1 to 3 show an embodiment of this invention, in which instruments such as a speedometer, tachometer, fuel gauge, water temperature gauge, etc. (not shown) are installed in an instrument housing 1 made of synthetic resin to indicate the vehicle operating status. Instruments are housed, and a flexible printed wiring board 2 is installed on the back side of the instrument housing 1, and a locking pin 3 provided integrally with the instrument housing 1 is connected to the flexible printed wiring board 2. The provided positioning hole 4 is inserted to position the printed wiring board 2 and prevent it from rising. In this case, a conductive circuit pattern is formed on the flexible printed wiring board 2 to be electrically connected to connection terminals of instruments, instrument lighting lamps, etc. (not shown), and from this conductive circuit pattern side to the vehicle battery side. It is electrically connected to.

Further, in this embodiment, an electric cord 5 that connects a sensor section attached to a speedometer or the like to the outside is drawn out and formed on the back side of the instrument housing 1, and a signal from this electric cord 5 and the sensor section is used. A protective cover 7 made of synthetic resin is fitted around the circuit board 6 on which electrical components that operate when the electric components are assembled are mounted, and this protective cover 7 has a position setting hole 8 for setting the mounting position with the instrument housing 1. The mounting position of the protective cover 7 is set by aligning the position setting hole 8 of the protective cover 7 with the locking pin 3 formed on the instrument housing 1, and the protective cover 7 is attached and fixed to the instrument housing 1 with screws 9. are doing.

Therefore, the positioning hole 4 of the flexible printed wiring board 2 is aligned with the locking pin 3 provided integrally in the instrument housing 1, and the positioning hole 4 of the protective cover 7 is aligned with the locking pin 3, and then the positioning hole 8 of the protective cover 7 is inserted into the locking pin 3. After setting the installation position of the protective cover 7 along the
The protective cover 7 can be easily attached to the instrument housing 1 by
It can be tightened and fixed.

At this time, since the flexible printed wiring board 2 is disposed between the protective cover 7 and the instrument housing 1, lifting of the flexible printed wiring board 2 can be suppressed.

In the embodiment described above, the position setting hole 8 provided in the protective cover 7 is connected to the locking pin 3 of the instrument housing 1.
The mounting position of the protective cover 7 is set according to the above, and the protective cover 7 is fixedly held on the instrument housing 1 using the screws 9. The protective cover 7 may be fixedly held by press-fitting the position setting hole 8 portion of the protective cover 7 .

[Effect of idea]

As described in detail above, by routing and arranging the flexible printed wiring board on the back side of the instrument housing, and attaching and fixing the protective cover containing the circuit board to the outside of the instrument housing, the flexible printed wiring board The flexible printed wiring board can be sandwiched and supported between the protective cover and the instrument housing, and has the excellent effect of suppressing lifting of the flexible printed wiring board due to external disturbances such as external vibrations and temperature changes.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the main parts showing an embodiment of this invention, Fig. 2 is a sectional view showing the main parts of Fig. 1, and Fig. 3 is an exploded perspective view showing the main parts of Fig. 2. . Instrument housing...1, Flexible printed wiring board...2, Locking pin...3, Positioning hole...
…4, Electrical cord…5, Circuit board…6, Protective cover…7, Position setting hole…8.

Claims (1)

[Scope of utility model registration request] A flexible printed wiring board with a predetermined conductive circuit pattern formed on the back side of the instrument housing is routed and arranged, and the circuit board with electrical components assembled is housed in a protective cover made of synthetic resin, and this protective cover is attached to the instrument housing. In the instrument housing, a locking pin is integrally protruded from the instrument housing, a positioning hole for fitting the locking pin is provided in the flexible printed wiring board, and the protective A positioning hole is provided in the protective cover to regulate the installation position of the cover, and the positioning hole provided in the flexible printed wiring board is inserted into the locking pin to regulate the position, and the positioning hole provided in the protective cover is A fixing structure for an external electrical component, characterized in that the position is set by inserting it into the locking pin.