JPH06290993A - Electronic component - Google Patents

Abstract

PURPOSE:To provide an electronic device, such as acceleration sensor or pressure sensor, in which a noise suppresser element and a base member are integrally formed to simplify its structure and adequately absorb external noises. CONSTITUTION:An acceleration sensor 8 (electronic device) comprises a circuit housed in a space between a base plate 1 and a cap cover. The base plate is fitted with a lead pin 2 through which the circuit is connected to an external member. A coaxial capacitor 6 (noise suppresser) is fixed integrally with that part of the base plate where the lead pin is fitted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a noise prevention element mounting structure for suppressing malfunction of an electronic element due to external noise.

[0002]

2. Description of the Related Art A conventional electronic device will be described by taking an acceleration sensor as an example.

As shown in FIG. 4, the acceleration sensor (electronic element) 8 is a base plate (a plate having a plurality of holes 1a formed by plating nickel (Ni) on an iron-based material such as SPC steel plate or SOS304. A printed circuit board on which components such as HIC and chip components (not shown) are mounted is disposed on the base member 1 except the holes 1a, and nickel plating is applied to the amount of iron-based material such as SPC steel plate and SOS304. The cap cover (cover member) 4 applied is welded to the base plate 1 by projection welding or the like in order to isolate the hole 1a and the constituent members from the outside. In order to electrically lead the constituent members out to the outside, a lead pin 2 made of a 50Ni—Fe alloy or the like in which nickel is plated in the hole 1a of the base plate 1
Is hermetically sealed through a high melting point glass 3 made of soda lime type, soda barium type, etc., and is drawn out to the back surface of the base plate 1. The lead pins 2 and the constituent members are electrically connected to each other on the base plate 1 by means such as wire bonding.

On the other hand, a mounting structure of a noise prevention element for suppressing external noise is disclosed in Japanese Patent Application Laid-Open No. 1-15205, and as shown in FIG. 5, a mounting member made of a shield material obtained by nickel-plating an SPC steel plate or the like. 5 has a plurality of holes 5a for inserting the lead pins 2 shown in FIG. 4 and a plurality of holes 5b for setting a feedthrough capacitor described later. The feedthrough capacitor 6, which is the noise prevention element, is set, the lead wire 7 of nickel-plated 50Ni—Fe alloy is inserted into the hole 6a of the feedthrough capacitor 6, and the hole 5 of the mounting member 5 is inserted.
Feedthrough capacitor 6 and feedthrough capacitor 6 set in b
The lead wire 7 inserted into the hole 6a is fixed by solder or the like (not shown).

As shown in FIG. 6, such a mounting member 5 has a lead pin 2 inserted into the hole 5a and welded thereto by means such as spot welding, and the lead pin 2 and the lead wire 7 are fixed by solder or the like (not shown). Thus, the acceleration sensor 8 to which the feedthrough capacitor 6 is externally attached is configured.

According to this structure, when the feedthrough capacitor 6 is attached to the acceleration sensor 8, the attachment member 5 and the lead wire 7 are attached.
However, the number of parts is increased, the structure is complicated, and the number of welding points such as soldering is increased, which is disadvantageous in the process and has a problem in reliability.

[0007]

According to the present invention, a physical quantity detection sensor and / or a constituent member composed of a circuit component is housed in a space defined by a base member and a cover member, and the above-mentioned external member is provided outside the base member. In an electronic element having a lead pin that is connected to a constituent member and led out, a noise prevention element that suppresses external noise to the constituent member is integrally fixed to a location of the base member to which the lead pin is fixed. To do.

[0008]

By integrally forming the base member and the noise prevention element, the number of components such as the mounting member is reduced and the structure is simplified.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described with reference to FIGS. 1 and 2 as to the mounting structure of a noise prevention element in an acceleration sensor in the same manner as in the conventional example. The detailed explanation is excluded.

The base plate 1 has a plurality of holes 1a 'for setting through capacitors which will be described later.
A feedthrough capacitor 6 for suppressing external noise to a component made up of a circuit component is set in a ', and a lead pin 2 is inserted into a hole 6a of the feedthrough capacitor 6 to melt a lead-based glass, which has a low softening point (sealing temperature). The base plate 1, the feedthrough capacitor 6, and the lead pin 2 are integrally fixed to each other to form an acceleration sensor 8 by sealing with a sealing glass 9 made of about 520 ° C.).

Next, a method of integrally fixing the base plate 1, the feedthrough capacitor 6 and the lead pin 2 of this embodiment will be described with reference to FIG.

The jig 10 made of carbon (C) having a plurality of escape holes 10a for the lead pins 2 is attached to the hole 1 of the base plate 1.
Set so that a ′ and the escape hole 10a of the jig 10 face each other. Then, the feedthrough capacitor 6 coated with the low melting point glass 9 is set in the hole 1 a ′ of the base plate 1, and the lead pin 2 is inserted into the hole 6 a of the feedthrough capacitor 6. Then, place this jig 10 on a stainless steel tray and heat it to about 520 ° C.
Through the electric furnace set at
The glass for sealing coated on the side surface 6b is melted to seal the base plate 1, the feedthrough capacitor 6 and the lead pin 2.

In addition to the above-described method, the base plate 1, the feedthrough capacitor 6 and the lead pin 2 are sequentially arranged on the jig 10, and a glass hole (not shown) is inserted into the lead pin 2 of the feedthrough capacitor 6. 6a, the base plate 1 and the feedthrough capacitor 6 may be poured and fixed in a gap (not shown).

As described above, the base plate 1 and the feedthrough capacitor 6 are provided.
Although the method for integrally fixing the lead pin 2 and the lead pin 2 has been shown, it goes without saying that the fixing member 5, the lead wire 7 and the like as shown in FIG. As a whole, the manufacturing process is simplified and the number of welding points such as soldering is reduced, so reliability is also improved.

FIG. 3 shows the result of examination of the electromagnetic wave resistance characteristics (influence of external noise) of the acceleration sensor 8 of the present invention. In FIG. 3, a shows that the base plate 1 of the present invention and the feedthrough capacitor 5 are integrated. The acceleration sensors 8 and 8 shown in FIG. 6 represent changes in the output voltage (Vout) of the conventional acceleration sensor 8 and C shown in FIG. 6, respectively.

Each of the acceleration sensors 8 described above is placed in an electromagnetic wave generation tank, and the radio wave types are carry wave (CW) and 80.
% AM modulated wave, electric field strength 10V / m, frequency 2 to 400
As a result of setting an arbitrary frequency of MHz, it became clear that the present invention most effectively suppresses external noise. This is because the feedthrough capacitor 6 is located on the base plate 1 as compared with the conventional acceleration sensor 8 (FIGS. 4 and 6), and thus external noise is less likely to enter along the way from the feedthrough capacitor 6 to the constituent members.

[0017]

According to the present invention, a constituent member composed of a physical quantity detection sensor and / or a circuit component is housed in a space defined by a base member and a cover member, and the constituent member is provided outside the base member. In an electronic device having a lead pin connected and led out, a noise prevention device for suppressing external noise to the constituent member is integrally fixed to a position of the base member to which the lead pin is fixed. In addition to the fact that parts such as mounting members and lead wires are not required compared to the past, not only the number of parts and manufacturing man-hours are reduced, but also the structure is simple and the number of welding points is reduced. improves. Further, since the feedthrough capacitor can be provided at a position closer to the constituent component including the circuit component, external noise can be sufficiently suppressed.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part of an embodiment of the present invention.

FIG. 2 is an exploded cross-sectional view of an essential part of the above embodiment.

FIG. 3 is an explanatory diagram showing an influence of external noise in the embodiment and the conventional example.

FIG. 4 is a perspective view of an acceleration sensor showing a conventional example.

FIG. 5 is a perspective view showing a mounting member in the conventional example.

FIG. 6 is a perspective view in which the mounting member in the conventional example is assembled to the acceleration sensor.

[Explanation of symbols]

 1 base plate (base member) 2 lead pin 4 cap cover (cover member) 6 feedthrough capacitor (noise prevention element) 8 acceleration sensor (electronic element) 9 sealing glass 1a 'hole 6a hole

Claims (1)

[Claims] 1. A constituent member including a physical quantity detection sensor and / or a circuit component is housed in a space formed by a base member and a cover member, and is connected to the outside of the base member and led out. In the electronic element having the lead pin, a noise prevention element that suppresses external noise to the constituent member is integrally fixed to a location of the base member to which the lead pin is fixed.