JPH1055906A - Electronic components sealed structure - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To surely increase the waterproofness of a lid itself generated when insert molding a terminal without increasing the number of working steps. SOLUTION: A terminal 9 is insert-molded in a synthetic resin lid 6, and one end of the terminal 9 is used as a connecting portion 9a.
And the other end protrudes from the outer surface of the lid 6 as a lead-out portion 9b. The connecting portion 9a is the lid 6
Contacts the end of the resistor 11 formed on the inner surface of the
The lead-out portion 9 b protrudes into a cylindrical portion 10 integrally formed on the outer surface of the lid 6. A pin hole 6a corresponding to the shape of the holding pin is exposed inside the cylindrical portion 10, and the pin hole 6a reaches the plate surface of the connection portion 9a. The lid 6 configured as described above is attached to the open end of the storage chamber 1 formed in the housing 2, and the external connector 12 is inserted into the cylindrical portion 10, thereby ensuring the hermeticity inside the cylindrical portion 10. .

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing structure for electronic components such as a vehicle height sensor, and more particularly to a sealing structure suitable for an electronic component in which terminals are insert-molded in a lid for closing a housing chamber of a housing. Regarding the structure.

[0002]

2. Description of the Related Art As an example of this type of electronic component, a shaft having a slider piece has been incorporated in a storage chamber formed in a housing, as described in Japanese Utility Model Laid-Open No. 4-107802. Then, there is known a potentiometer in which the open end of the storage chamber is closed with a lid, and a resistor formed on the inner surface of the lid is brought into contact with the slider piece. In such a known potentiometer, a terminal made of a metal plate is insert-molded on a synthetic resin lid, one end of the terminal is connected to a resistor on the inner surface of the lid, and the other end of the terminal is a lid. Is derived from the outside. Therefore, by connecting an external connector to the lead-out end of the terminal, a change in resistance according to the rotation angle of the shaft is output from the potentiometer via the external connector.

[0003]

By the way, when the terminal is fixed to the lid by insert molding, unless the terminal is securely pressed and held in the molding die, the terminal fluctuates due to the resin pressure, and the terminal and the molding (not shown) are formed. The resin enters between the molds, and a resin film is formed on the surface of the terminal, and the resin film is interposed between the terminal and the resistor, and the reliability of the connection between the two is reduced. . For this reason, as shown in FIG. 7A, it is necessary to press and hold the terminal T with the pressing pin P of the molding die.
As shown in (b), a pin hole S corresponding to the shape of the holding pin P is formed on the surface of the lid. As a result, a small gap formed at the boundary surface between the lid and the terminal communicates with the pin hole S, and the airtightness of the lid itself is reduced by this communication path.

However, in the above-mentioned prior art, since the existence of such pin holes is not considered at all,
When the potentiometer is used in an environment that contains moisture and dust, such as a vehicle height sensor, foreign matter such as moisture and exhaust gas enter the housing chamber of the housing through the pin holes, and slide inside the housing chamber. There are problems such as corrosion of the moving piece.
Also, if the pin holes were to be closed with an adhesive after insert molding to improve the airtightness of the lid itself, a post-process of applying the adhesive would be required, increasing the number of work steps and increasing costs. Problem.

[0005]

SUMMARY OF THE INVENTION According to the present invention, a housing cylindrical portion for an external connector is integrally formed on an outer surface of a lid, and a terminal pressing portion for exposing a terminal into the cylindrical portion is exposed. And As described above, when the terminal holding portion required for insert molding is located inside the cylindrical portion, the airtightness in the cylindrical portion is secured by the external connector inserted into the cylindrical portion when the electronic component is used. Foreign matter such as exhaust gas can be prevented from entering the storage chamber of the housing through the terminal holding portion and the boundary surface between the lid and the terminal.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In an electronic component sealing structure according to the present invention, a housing having a storage chamber, an operating body supported by the housing, and a slider fixed to the operating body inside the storage chamber. A piece, a synthetic resin lid fixed to the housing so as to close the open end of the storage chamber, a conductor pattern formed on the inner surface of the lid, and the conductor pattern. A terminal for electrically leading out to the outer surface of the cover, and integrally forming a cylindrical portion for accommodating an external connector connectable to the lead-out end of the terminal on the outer surface of the lid, and inside the cylindrical portion. The terminal holding portion when the terminal was insert-molded was exposed.

As the conductor pattern, an appropriate one is used according to the type of electronic component. A resistor is used for a potentiometer (variable resistor), and a conductor such as silver paste is used for an encoder. Can be

When the terminal is subjected to insert molding, for example, a flat plate surface of the terminal can be pressed by a pressing pin of a molding die. In this case, the shape of the pressing pin is formed on the inner bottom surface of the cylindrical portion. Are formed, and the external surface of the terminal exposed in the pin hole serves as a terminal pressing portion.

Further, a wing piece may be formed in the terminal in advance, and the end face of the wing piece may be pressed by a molding die when insert molding this terminal. The end face of the wing piece exposed on the inner bottom surface serves as a terminal holding portion.

[0010]

Embodiments will be described with reference to the drawings.
FIG. 1 is a sectional view of a position sensor according to a first embodiment of the present invention,
FIG. 2 is a rear view of a lid provided in the position sensor, and FIG. 3 is a plan view of the lid.

The position sensor shown in FIG. 1 has a housing 2 made of a synthetic resin having a storage chamber 1 and a shaft (operating body) rotatably supported on the housing 2 via a bearing 3.
4, a rotating plate 5 fixed to the tip of the shaft 4,
A synthetic resin lid 6 is attached to the open end of the storage chamber 1 and a slider piece 7 is attached to the lower surface of the rotary plate 5. It is pressed against the inner surface of the lid 6. The lid 6 is fixed to the housing 2 by heat caulking or the like, and an airtight packing 8 is interposed on the joint surface between the lid 6 and the housing 2.

A terminal 9 obtained by bending a metal plate into a crank shape is insert-molded on the lid 6.
Is exposed on the inner surface of the lid 6 as a connecting portion 9a, and the other end protrudes on the outer surface of the lid 6 as a lead-out portion 9b. This terminal 9 is connected in a direction orthogonal to the plane of FIG.
In this arrangement, the terminals 9 are electrically independent of each other. Further, the cover 6 is formed with three pin holes 6a corresponding to the respective terminals 9, and each pin hole 6a extends from the outer surface of the cover 6 to the plate surface of the connection portion 9a. The pin hole 6a corresponds to the shape of the presser pin of a molding die (not shown).
The flat plate surface of each connection portion 9a is pressed against a molding die (not shown) by a pressing pin, so that the terminal 9 fluctuates due to the resin pressure and the resin enters between the terminal 9 and the molding die, and the connection portion 9a
Is prevented from forming a resin film on the surface thereof, and the connecting portion 9a is exposed so that an end portion of a resistor 11 described later reliably contacts the connecting portion 9a.

A cylindrical portion 10 is integrally formed on the outer surface of the lid 6, and the cylindrical portion 10 is formed in a track shape so as to surround the lead-out portion 9b of each terminal 9 as shown in FIG. Each pin hole 6a is exposed inside. As will be described later, the cylindrical portion 10 functions as a holding portion for accommodating an external connector.
a is formed. In addition, as shown in FIG.
A resistor 11 is printed on the inner side surface of the resistor 11 and the slider piece 7 is pressed against an annular portion of the resistor 11. The end of the resistor 11 is overlapped on each connecting portion 9 a, and the resistor 11 is led out to the outer surface of the lid 6 via each terminal 9.

The position sensor configured as described above is used as, for example, a vehicle height sensor for detecting a displacement amount of the vehicle height by mounting the housing 2 at a predetermined position of the vehicle body. At that time, as shown in FIG.
0, the external connector 12 is inserted into
b is connected to a contact (not shown) of the external connector 12.
The external connector 12 has a lock hole 12a for retaining the lock, and the lock hole 12a is fitted to a locking claw 10a of the cylindrical portion 10. An airtight packing 13 is mounted on the external connector 12.
3, the hermeticity in the cylindrical portion 10 is ensured. Therefore, each pin hole 6a formed at the time of insert molding of the terminal 8 is sealed when the external connector 12 is press-fitted into the cylindrical portion 10, and moisture, exhaust gas, and the like are removed from each pin hole 6a, the lid 6 and the terminal 9 There is no danger of intrusion into the storage room 1 through the boundary surface.

FIG. 5 is a sectional view of a main part of a position sensor according to a second embodiment of the present invention, and FIG. 6 is a perspective view of a terminal provided in the position sensor. The same reference numerals are given.

The second embodiment is different from the first embodiment in that the wing pieces 9c are bent on both sides of the connecting portion 9a of the terminal 9, and the terminal 9 is inserted into the lid 6. In molding, the end face of the wing piece 9c is directly pressed by a molding die, and the other configuration is basically the same. In this case, instead of forming the pin hole 6a after the insert molding, the end face of the wing piece 9c is exposed on the outer surface of the lid 6, and a slight gap is formed at the boundary surface between the lid 6 and the wing piece 9c. Occurs. Therefore, the end surface of the wing piece 9c is
When the external connector 12 is press-fitted into the cylindrical portion 10, moisture and exhaust gas are stored through the plate surface of the wing piece 9 c by ensuring airtightness in the cylindrical portion 10 when the external connector 12 is pressed into the cylindrical portion 10. The intrusion into the room 1 is prevented.

In the above embodiment, the resistor 11
Is directly overlaid on the connection portion 9a, but a conductive pattern may be interposed between them. Further, the present invention relates to E
The present invention can also be applied to a linear sliding type electric component such as a GR sensor.

[0018]

The present invention is embodied in the form described above and has the following effects.

When a cylindrical portion for accommodating an external connector is integrally formed on the outer surface of the lid and a terminal holding portion for exposing a terminal into the cylindrical portion is exposed, the cylindrical portion is inserted into the cylindrical portion when the electronic component is used. Since the airtightness in the cylindrical portion is ensured by the external connector, foreign matters such as moisture and exhaust gas can be prevented from entering the housing chamber of the housing through the terminal holding portion.

[Brief description of the drawings]

FIG. 1 is a sectional view of a position sensor according to a first embodiment of the present invention.

FIG. 2 is a rear view of a lid provided in the position sensor.

FIG. 3 is a plan view of the lid.

FIG. 4 is a sectional view of a main part showing a state where an external connector is connected to the position sensor of FIG. 1;

FIG. 5 is a sectional view of a main part of a position sensor according to a second embodiment of the present invention.

FIG. 6 is a perspective view of a terminal provided in the position sensor.

FIG. 7 is an explanatory view showing a terminal insert molding step.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Storage room 2 Housing 4 Shaft (operating body) 5 Rotating plate 6 Lid 6a Pin hole 7 Slider piece 8 Packing 9 Terminal 9a Connection part 9b Derivation part 9c Wing piece 10 Tubular part 11 Resistor 12 External connector 13 Packing

Claims (3)

[Claims] 1. A housing having a storage chamber, an operating body supported by the housing, a slider piece fixed to the operating body inside the storage chamber, and an open end of the storage chamber is closed. A synthetic resin lid fixed to the housing, a conductor pattern formed on the inner surface of the lid, and a terminal for electrically leading the conductor pattern to the outer surface of the lid. A cylindrical portion for accommodating an external connector connectable to the lead-out end of the terminal is integrally formed on the outer surface of the lid, and a terminal pressing portion for insert-molding the terminal in the cylindrical portion is provided. A sealed structure for electronic components, which is exposed. 2. The terminal according to claim 1, wherein the terminal pressing portion is an outer surface of the terminal, and a pin hole communicating with the terminal pressing portion is formed on an inner bottom surface of the cylindrical portion. Sealed structure for electronic components. 3. The electronic component hermetically sealed structure according to claim 1, wherein said terminal holding portion is an end surface of a wing piece bent and formed on said terminal.