JP3476696B2 - Adhesive structure of adherend - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an adhesive structure for an adherend, and more particularly to an adhesive structure for an adherend capable of preventing an adhesive from entering the case-like adherend.

[0002]

2. Description of the Related Art Conventionally, an acceleration sensor for detecting acceleration by detecting a pressure change has been used. Figure 5
Shows a sectional view of the sensor showing the bonding structure of the package case and the lid in the acceleration sensor, and FIG. 6 shows a sectional view of the main part thereof.

The acceleration sensor 1 will be briefly described below.
As shown in FIG. 5, a cylindrical package case 3 is placed and fixed on the circuit board 2. A vent hole 4 is provided in the center of the circuit board 2 surrounded by the package case 3. A C-type diaphragm-type semiconductor pressure-sensitive sensor chip (hereinafter, simply referred to as a sensor chip) 5 is mounted in the package case 3 so as to close the ventilation hole 4.

The sensor chip 5 has a rectangular parallelepiped shape in which the bottom is hollowed out in a trapezoidal shape, and the hollowed out portion is a thin portion 5a. A diffusion strain gauge 5b made of a silicon semiconductor (PN junction element) is formed on the thin portion 5a, and the strain in the thin portion 5a (that is, the pressure applied to the thin portion 5a) is sensed and An electric signal corresponding to the pressure is output as a detection signal. The hollowed-out portion below the thin portion 5 a of the sensor chip 5 is open to the outside air through the ventilation hole 4.

The sensor chip 5 is a monolithic semiconductor chip in which a diffusion strain gauge 5b and an amplifier 5c are simultaneously formed on its upper surface. The amplifier 5c amplifies the detection signal output from the diffusion strain gauge 5b and outputs the detection signal to the outside via the bonding wire 6, the printed pattern on the circuit board 2 and the external terminal 11. Further, a silicon gel 8 having an appropriate density is housed in the package case 3 so as to cover the sensor chip 5. Further, the upper opening of the package case 3 is sealed by the cap 9 being adhered and fixed.

When acceleration is applied to the acceleration sensor 1 thus constructed, the sensor chip 5 immediately receives pressure through the silicon gel 8 inside the package case 3. Then, the thin portion 5a of the sensor chip 5 bends and vibrates. At this time, since the hollowed-out portion of the sensor chip 5 is open to the outside air through the ventilation hole 4,
Even if the volume of the hollow portion changes due to bending and vibration of the thin portion 5a, no pressure is applied from the hollow portion to the thin portion 5a side. The diffusion strain gauge 5b formed on the thin portion 5a senses bending and vibration of the thin portion 5a,
An electric signal corresponding to the bending of the thin portion 5a and the distortion due to vibration (that is, the pressure applied to the thin portion 5a) is output as a detection signal.

That is, the detection signal of the diffusion strain gauge 5b (sensor chip 5) corresponds to the acceleration applied to the acceleration sensor 50. The detection signal of the sensor chip 5 is amplified by the amplifier 5c and output to the outside via the bonding wire 6, the print pattern and the external terminal 11.

By the way, in the conventional acceleration sensor 1 configured as described above, the inner rib 12 and the outer rib 13 are provided along the circumferential direction on the bonding end surface of the periphery of the opening of the package case 3. And both ribs 12, 1
An engagement groove 14 is formed between the three. Engaging ribs 15 formed in the circumferential direction on the adhesive end surface of the cap 9.
Are engaged in the engaging groove 14. Then, when the cap 9 is bonded to the package case 3, the engagement rib 15 of the cap 9 is inserted into the engagement groove 14 of the package case 3 with the adhesive 16 pre-applied in the engagement groove 14.
It is locked inside and is fixed by adhesive in this state.

[0009]

However, conventionally, the structure shown in FIG. 6, that is, the engaging groove 14 is formed in a substantially U-shaped cross section, and the engaging rib 15 is also provided in the engaging groove 14. It has a square cross section so that it can be loosely fitted in. For this reason,
When the engagement rib 15 is engaged in the engagement groove 14, the engagement groove 14
The adhesive 16 therein may enter the package case 3. In this case, since the acceleration sensor 1 is sealed by the cap 9, if the adhesive 16 enters the space S (the space between the silicon gel 8 and the cap 9) inside the package case 3, the sensor sensitivity is increased. Could have an adverse effect on.

Bubbles may be mixed in the adhesive 16, and when the adhesive 16 enters the space S, the moisture in the bubbles easily enters the space S. Further, when the adhesive hardens while the air bubbles in the adhesive 16 are trapped between the cap 9 and the ribs of the package case 3, the adhesive force is reduced due to the existence of the air bubbles and the adhesion between the cap 9 and the package case 3 is reduced. There is a possibility that the performance (sealing property) deteriorates and the sensitivity and durability of the sensor are adversely affected.

The present invention has been made to solve the above problems, and an object thereof is to bond a lid-shaped adherend with an adhesive to the peripheral edge of the opening of the case-like adherend. In this case, it is an object of the present invention to provide an adhesive structure for an adherend, which prevents the adhesive from entering the case-like adherend and allows air bubbles to escape from the case-like adherent favorably.

[0012]

According to a first aspect of the present invention, there is provided a case-shaped adherend and a lid-like adherend fixed to the peripheral edge of an opening of the case-like adherend with an adhesive. in bonding structure, the adhesive end surface provided in the opening portion of the case-like adherend is a first rib of the opening close along the opening peripheral edge, spaced from the opening portion than the first rib A second rib is formed, a groove is formed between both ribs,
The bonding end face of the cap-like adherend engaged been engaged input rib is formed in the groove portion, the gap between the the same engagement incoming rib first rib
It is narrower than the gap between the engaging rib and the second rib ,
The height of the protrusion is higher than the height of the second rib.
Ri, the outer peripheral surface of the engagement input ribs disposed about the opening closer toward the distal end side, with respect to the inner peripheral surface of the first rib (12)
The gist of the invention is the adhesive structure of the adherends that are closely fitted .

[0013] The invention according to claim 2, in claim 1, before <br/> Symbol first rib, which the bonding structure of the adherend to wicking prevention portion of the adhesive is formed as gist Is.

The invention of claim 3 is the invention of claim 1 or claim 2.
In the above, the gist of the present invention is the adhesion structure of the adherend, in which the groove-side inner surface of the second rib is formed such that the distance from the outer peripheral surface of the engaging rib increases as it goes to the tip. .

Therefore, according to the first aspect of the invention, when the lid-like adherend is adhered to the case-like adherent, the engagement rib is inserted into the groove portion to which the adhesive is applied in advance. Insert into the groove.
At this time, since the outer peripheral surface of the engaging rib is arranged closer to the opening toward the tip side, the adhesive in the groove portion is moved outward by the outer peripheral surface of the engaging rib when the engaging rib moves into the groove portion. Since the adhesive is pressed, the adhesive is prevented from entering the opening.
Further, when the engaging ribs are engaged, the bubbles in the adhesive in the groove are also pressed outward together with the adhesive by the outer peripheral surface of the engaging ribs, so that the bubbles can be easily released. Furthermore, the height of the first rib
Is longer than the height of the second rib, so the engaging rib
The adhesive extruded by is extruded toward the second rib side.
It is easier to prevent the adhesive from entering the opening.
It

Further , since the engaging ribs are tightly fitted to the first ribs and the adhesive is narrow between the engaging ribs and the first ribs, the adhesive is further prevented from entering the opening. .

According to the second aspect of the present invention, the creeping-up preventing portion of the first rib traps (captures) the adhesive that has climbed up from the groove portion at this portion, and prevents the adhesive from entering the opening portion. .

According to the third aspect of the present invention, the inner surface of the second rib on the groove portion side is formed so that the distance from the outer peripheral surface of the engaging rib increases as it goes to the tip end portion. When the adhesive in the groove is pressed outward by the outer peripheral surface of the engaging rib due to the engagement, the adhesive is moved along the inner surface of the second rib on the groove side, so that bubbles can be favorably released.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) An embodiment in which the present invention is embodied in an acceleration sensor 1 will be described below with reference to the drawings.

In this embodiment, the same components as those of the conventional structure are designated by the same reference numerals, and detailed description thereof will be omitted. FIG. 1A shows a partially cutaway perspective view of the acceleration sensor 1 of the present embodiment. In addition, in FIG.
The sectional view on the AA line of (a) is shown. Further, FIG. 2 shows a cross-sectional view of a main part of a joint portion between the package case 3 of the acceleration sensor 1 and the cap 9.

In this embodiment, an inner rib 12 as a first rib and an outer rib 13 as a second rib are provided along the circumferential direction on the bonding end surface at the periphery of the opening of the package case 3. An engaging groove 14 as a groove is formed between the ribs 12 and 13. The package case 3 corresponds to the case-shaped adherend of the present invention, and the cap 9 corresponds to the lid-like adherend.

Engaging ribs 15 formed along the circumferential direction are engaged in the engaging groove 14 on the adhesive end surface of the cap 9. When the cap 9 is bonded to the package case 3, the engagement rib 15 of the cap 9 is inserted into the engagement groove 14 of the package case 3 while the adhesive 16 is applied in advance in the engagement groove 14. In this state, it is adhesively fixed.

The outer peripheral surface of the engaging rib 15 is arranged closer to the opening of the package case 3 as it goes to the front end side. That is, the outer peripheral surface is formed into a tapered surface 15a so that the wall thickness decreases toward the tip side. Further, the engagement rib 15 is tightly fitted to the inner rib 12. That is, the inner diameter of the engagement rib 15 is substantially the same as the outer diameter of the inner rib 12.

Further, as shown in FIG. 2, the distance between the tapered surface 15a of the engaging rib 15 and the inner peripheral surface of the outer rib 13 (the distance in the radial direction of the package case 3) is the narrowest distance α. Is longer than the distance β of the gap with the inner rib 12. Further, the protruding height of the engagement rib 15 is such that when the engagement rib 14 is engaged with the engagement groove 14,
The height is set so that it can contact the bottom surface of the.

When the engaging rib 15 is in contact with the bottom surface of the engaging groove 14, the end surface of the inner rib 12 (the upper end surface in FIG. 2) and the inner top surface of the cap 9 are close to each other. The height of the rib 12 is provided. On the other hand, in a state where the engagement rib 15 is in contact with the bottom surface of the engagement groove 14, the end surface of the outer rib 13 (the upper end surface in FIG. 2),
The distance γ between the joint end faces of the cap 9 facing the same end face is
The distance is larger than the distance between the end surface of the inner rib 12 (upper end surface in FIG. 2) and the inner top surface of the cap 9.

When the cap 9 is bonded to the package case 3 described above, the engaging rib 15 is provided with the engaging rib 15 with respect to the engaging groove 14 to which the adhesive 16 is applied in advance.
Enter within 4. At this time, since the tapered surface 15a of the engaging rib 15 is arranged closer to the opening toward the tip side, the adhesive 16 in the engaging groove 14 moves into the engaging groove 14 in the engaging rib 15. At that time, due to the tapered surface 15a,
Pressed outward. Therefore, the adhesive 16 is prevented from entering the opening of the package case 3.

Further, by engaging the engaging rib 15, the engaging groove 14 is formed.
Bubbles in the adhesive 16 inside are also pressed outward together with the adhesive 16 by the tapered surface 15a of the engaging rib 15.
Good escape of bubbles.

In this embodiment, the following unique effects are exhibited. (1) In the present embodiment, the inner rib 12 (first rib) and the outer rib 13 (on the outer peripheral edge of the package case 3 (case-shaped adherend) are provided along the peripheral edge of the opening provided on the peripheral edge of the opening. The second rib) is provided, and the engaging groove 14 (groove portion) is provided between the ribs 12 and 13. An engaging rib 15 engaged with the engaging groove 14 is formed on the adhesive end surface of the cap 9 (lid-shaped adherend) to narrow the gap between the engaging rib 15 and the inner rib 12 of the package case 3. (Shortened), then the rib 15
And the gap between the outer ribs 13 is increased. Furthermore, the engagement rib 1
The tapered surface 15a of No. 5 was arranged closer to the opening toward the tip side. As a result, when the cap 9 is bonded to the package case 3, the taper surface 15a of the engaging rib 15 is formed.
As a result, the adhesive 16 in the engagement groove 14 is pressed outward, so that it is possible to prevent the adhesive 16 from entering the opening.
Further, the engagement of the engagement rib 15 allows the adhesive 1 in the engagement groove 14 to be inserted.
The bubbles in 6 are also pushed outward together with the adhesive 16 by the tapered surface 15a of the engaging rib 15, so that the bubbles can be satisfactorily released.

(2) In the present embodiment, the engaging rib 15
Was tightly fitted to the inner rib 12. As a result, since the adhesive 16 is narrow between the engaging rib 15 and the inner rib 12, it is possible to further prevent the adhesive 16 from entering the opening.

(3) In this embodiment, the outer rib 1 is in the state where the engaging rib 15 is in contact with the bottom surface of the engaging groove 14.
The distance γ between the end face of the inner rib 12 (the upper end face in FIG. 2) and the joint end face of the cap 9 facing the end face is the distance between the end face of the inner rib 12 (the upper end face in FIG. 2) and the inner top face of the cap 9. Made bigger. Then, the portion of the adhesive end surface of the cap 9 and the adhesive end surface of the package case 3 which were separated by a distance γ was opened to the outside without being covered.

As a result, when the bubbles in the adhesive 16 face the portion open to the outside, the bubbles are broken in the same portion and the bubbles can be eliminated. (4) In this embodiment, the acceleration sensor 1 is embodied. As a result, the adhesive 16 can be prevented from entering the opening, and since the bubbles in the adhesive 16 do not enter the space S, moisture does not enter the space, and durability and detection sensitivity characteristics are improved. There is no adverse effect.

(Second Embodiment) Next, a second embodiment of the present invention will be described focusing on the points different from the first embodiment, and the same components as those in the first embodiment will be designated by the same reference numerals. And detailed description thereof will be omitted.

FIG. 3 shows a sectional view of the main part of the acceleration sensor 20 of this embodiment. As shown in the figure, in this embodiment, a notched corner portion 12a is formed on the outer peripheral surface of the tip of the inner rib 12. The notch corner portion 12a removes the adhesive 16 that creeps up a narrow gap between the engagement rib 15 and the inner rib 12 when the engagement rib 15 comes into contact with the bottom surface of the engagement groove 14. 12a, the inner surface of the engaging rib 15 and the inner top surface of the cap 9 are trapped in the space surrounded by the space and are prevented from further entering the opening.

Further, a tapered surface 13a is formed by obliquely cutting the inner peripheral surface of the outer rib 13. The distance surface (separation distance in the radial direction of the package case 3) between the taper surface 15 of the engaging rib 15a and the taper surface 13a of the outer rib 13 of the same surface 13a becomes longer toward the tip of the outer rib 13. The taper angle is set. Therefore, the adhesive 16 in the engaging groove 14 is not attached to the engaging rib 15.
When the tape is engaged in the engaging groove 14, both tapered surfaces 13
It is pushed out smoothly by a and 15a. Further, the bubbles in the adhesive 16 are smoothly guided by the tapered surface 13a, move to the tip side of the outer rib 13, and are discharged to the outside.

In this embodiment, the following unique effects are exhibited. (1) In the present embodiment, the outer surface of the tip of the inner rib 12 is
A notched corner portion 12a (a creeping-up prevention portion) is provided.
As a result, the notch corner portion 12a of the inner rib 12 traps (captures) the adhesive 16 that has climbed up from the engagement groove 14 at this portion, and thus it is possible to prevent the adhesive 16 from entering the opening.

(2) In this embodiment, the tapered surface 13
The taper surface 15 of the engaging rib 15 increases toward the tip of a.
The taper surface 13a of the outer rib 13 is formed so that the distance from it is large. As a result, when the engagement rib 15 is engaged, the adhesive 16 in the engagement groove 14 is pressed outward by the tapered surface 15a of the engagement rib 15, and thus the adhesive 1
The bubbles in 6 are also moved upward in FIG. 3 along the tapered surface 13a of the outer rib 13 so that the bubbles can be effectively removed.

(Third Embodiment) Next, a third embodiment will be described focusing on the points different from the first embodiment, and the same components as those in the first embodiment will be designated by the same reference numerals and detailed description thereof will be given. The description is omitted.

FIG. 4 shows a sectional view of the main part of the acceleration sensor 20 of this embodiment. As shown in the figure, in this embodiment, instead of the dater surface 15a of the first embodiment, the step-like pressing surface 15b is formed so that the outer peripheral surface of the engaging rib 15 becomes thinner toward the tip side. Is formed in. Therefore, when the cap 9 is bonded to the package case 3, the adhesive 16 in the engagement groove 14 can be pressed outward against the pressing surface 15b.

Therefore, also in this embodiment, the same operational effects as (1) and (2) of the first embodiment can be realized. The present invention can be embodied as follows.

(1) In the second embodiment, the notch corner portion 12a is formed on the outer peripheral surface of the tip of the inner rib 12 as the creep-up prevention portion, but instead of the tip outer surface of the inner rib 12, the creep-up prevention portion is formed. A peripheral groove may be provided on the outer peripheral surface of the central portion of the inner rib 12, or a peripheral groove may be provided on the lower outer peripheral surface. Further, the cutout corner portion 12a is not provided alone, but the combination of the peripheral groove of the central outer peripheral surface and the cutout corner portion 12a, the combination of the peripheral groove of the lower peripheral surface and the cutout corner portion 12a, or the central portion outer circumference It may be a combination of the peripheral groove of the surface and the peripheral groove of the lower outer peripheral surface. Further, the number of the circumferential grooves may be three or more, and the effect of preventing the adhesive 16 from creeping up can be improved as the number of the circumferential grooves increases.

(2) Instead of the tapered surfaces 13a and 15a, the surfaces may be formed so as to bulge outward or have an arcuate cross section, or may be formed so as to be inwardly concave and have an arcuate cross section. (3) In the above embodiment, the bonding structure of the package case 3 and the cap 9 of the acceleration sensor 1 is embodied, but it may be embodied as another sensor or a package structure other than the sensor. Even in this case, since the adhesive does not enter the package case and bubbles easily escape,
It is possible to prevent an adverse effect due to the invasion of the adhesive or the invasion of bubbles in the adhesive.

Although the respective embodiments of the present invention have been described above, technical ideas other than the claims which can be understood from the respective embodiments will be described below together with their effects. 1) crawling have up prevention unit, the adhesion structure of the adherend is a cutaway Corner portion provided at a tip end outer surface of the first rib. By doing so, the adhesive can be captured at the notched corner portion, and the adhesive can be prevented from entering the opening.

[0043] 2) the outer peripheral surface of the front Symbol engagement input ribs adhesion structure of the adherend which has a tapered. By tapering the outer peripheral surface of the engaging rib, when the lid-shaped adherend is adhered to the case-like adherent, the adhesive in the groove may be pushed outward and the adhesive may enter the opening. Disappear.

3) The height of the second rib is lower than that of the first rib, and the distance between the bonding end surfaces of the second rib and the lid-shaped adherend is the same as that of the first rib and the lid-shaped adherend. The bonded structure of an adherend is characterized in that it is longer than the distance between the bonded end faces of.
With this configuration, since the distance between the bonding end surfaces of the second rib and the lid-shaped adherend is longer than the distance between the bonding end surfaces of the first rib and the lid-like adherend, the ribs are extruded into the engaging ribs. The adhesive is more easily extruded to the second rib side, and the adhesive does not enter the opening. When the facing portion of the bonding end surface of the lid-shaped bonded body is opened without being covered, the bubbles can disappear at this portion.

[0045] 4) case-like adherend is adhered structure Ah Ru adherend in the package case for housing a sensor. By doing so, the adhesive does not enter the package case accommodating the sensor, so that adverse effects due to the intrusion of the adhesive or the invasion of bubbles in the adhesive can be prevented.

5) In the technical idea of 4) above, the sensor is a pressure sensor, and an adhesion structure of an adherend in which the acceleration transmission medium (8) is sealed in the package case. By doing so, air bubbles escape from the adhesive, and the adhesive force does not decrease due to the presence of air bubbles, and the adhesion (sealing property) between the lid-shaped adherend and the case-like adherend deteriorates. There is no adverse effect on the sensitivity and durability of the sensor. In the above embodiment, the silicon gel 8 corresponds to the acceleration transmission medium, and the sensor chip 5 corresponds to the pressure sensor.

[0047]

As described above in detail, according to the present invention, according to the inventions of claims 1 to 3 , it is possible to prevent the adhesive from entering the case-shaped adherend and to prevent bubbles from being generated. It is possible to favorably remove the case-like adherend.

According to the first aspect of the present invention, the engagement rib is tightly fitted to the first rib, and the space between the engagement rib and the first rib is narrowed by the adhesive. It is possible to prevent the agent from entering.

According to the second aspect of the present invention, the creeping-up preventing portion of the first rib allows the adhesive that has climbed up from the groove portion to be trapped (captured) at this portion, so that the adhesive agent can be prevented from entering the opening portion.

According to the third aspect of the present invention, the inner surface of the second rib on the groove side is formed such that the distance from the outer peripheral surface of the engaging rib increases as it goes to the tip. When the ribs are engaged, bubbles in the adhesive in the groove are also pushed outward together with the adhesive by the outer peripheral surface of the engaging ribs, so that the bubbles can be satisfactorily released.

[Brief description of drawings]

1A is a partially cutaway perspective view of an acceleration sensor according to a first embodiment of the present invention, and FIG. 1B is a sectional view.

FIG. 2 is a sectional view of the same main part.

FIG. 3 is a cross-sectional view of a main part of the second embodiment.

FIG. 4 is a sectional view of an essential part of a third embodiment.

FIG. 5 is a sectional view of a conventional acceleration sensor showing a bonding structure between a package case and a lid.

FIG. 6 is a sectional view of an essential part showing a conventional bonding structure.

[Description of Reference Signs] 1 ... Acceleration sensor, 3 ... Package case (constituting case-shaped adherend), 9 ... Cap (constituting lid-like adherend), 12 ... Inner rib (first rib) , 13 ... Outside ribs (constituting second ribs), 1
3a ... Tapered surface, 14 ... Engaging groove (constituting groove portion) 15 ... Engaging rib, 15a ... Tapered surface, 15b ... Notched corner (constituting creeping-up preventing portion), 16 ... Adhesive agent, S ... space.

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-9-199864 (JP, A) JP-A-7-237267 (JP, A) JP-A-6-64045 (JP, A) JP-A-9- 315058 (JP, A) JP-A-8-152374 (JP, A) JP-A-6-186104 (JP, A) JP-A-6-21660 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) G01P 15/08 G01L 19/14

Claims (3)

(57) [Claims] 1. An adhesion structure of a case-shaped adherend (3) and a lid-shaped adherend adhered to an opening peripheral edge of the case-shaped adherend (3) by an adhesive, wherein: Jo adherend and the first rib in the bonding end surface provided in the opening peripheral edge of the opening portion closer along the periphery of the opening of (3) (12), the opening portion than the first rib (12) Second ribs (13) spaced apart from each other are formed, a groove (14) is formed between both ribs, and an engaging rib (15) engaged with the groove (14) is formed on the adhesive end surface of the lid-shaped adherend. ) is formed, the gap between the the same engaging inlet ribs (15) first ribs (12)
Than the gap between the engaging inlet ribs (15) and the second rib (13)
The height of the first rib (12) is narrower than that of the second rib (13).
The engaging rib (15) is formed to be higher than the height, and the outer peripheral surface of the engaging rib (15) is arranged closer to the opening toward the tip side, and the inner peripheral surface of the engaging rib (15) faces the first rib (12).
An adhesive structure for adherends, which is characterized by being closely fitted . 2. The first rib (12) has an adhesive crawler.
It is characterized in that a rising prevention portion (12a) is formed.
The adhesive structure for an adherend according to claim 1. 3. The groove-side inner surface (1) of the second rib (13)
3a) is outside the engaging rib (15) as it goes to the tip.
The adhesive structure for an adherend according to claim 1 or 2, wherein the adhesive structure is formed so as to have a large distance from the peripheral surface .