JP3736239B2 - Cap pressurizing jig - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cap pressurizing jig used when a shielding cap for covering an electronic component is bonded to a circuit board on which the electronic component such as a piezoelectric element is arranged.
[0002]
[Prior art]
Conventionally, a circuit board having a relatively small size is manufactured by a method in which a collective board in which a plurality of predetermined circuits are formed on a standard size printed board is cut for each circuit by a processing machine such as a dicer. Also, when the circuit board is applied to an electrical appliance, it may malfunction due to the influence of electromagnetic waves emitted from other circuits placed nearby, or it may cause other circuits to malfunction by emitting electromagnetic waves. In order to prevent this, an electronic component such as a piezoelectric element arranged on a circuit board may be covered with a metal cap and shielded. In the case of a circuit board having a relatively small size, the cap is attached before the board is cut. In the step of adhering the cap to the substrate, a cap pressing jig for pressing the top surface of the cap is set on the collective substrate so that the cap does not shift with respect to the substrate when the adhesive is cured. The adhesive was cured while the top surface of the cap was pressurized.
[0003]
Conventional cap pressurizing jigs include those shown in FIGS. A cap pressurizing jig 15 shown in FIG. 4 is obtained by attaching a rubber 16 having a flat surface to a metallic plate 17. In the figure, 10 is a collective substrate, 11 is a printed circuit board (hereinafter simply referred to as substrate 11), and 12 is a metal cap that adheres to the substrate 11. The cap pressurizing jig 15 can be set in a state where the top surface of the cap 12 is pressed by bringing the surface of the rubber 16 into contact with the top surface of the cap 12 with a setting tool (not shown).
[0004]
5 has a configuration in which a pin 21 slidably attached is biased by a spring 22. Note that FIG. 5B is an internal cross-sectional view of a portion surrounded by a broken line in FIG. The cap pressing jig 20 can also be set in a state in which the top surface of the cap 12 is pressed by bringing the tip of the pin 21 into contact with the top surface of the cap 12 with a setting tool (not shown).
[0005]
The collective substrate 10 on which the cap pressurizing jig 15 (or 20) was set was put into a curing furnace to cure the adhesive, and the cap 12 was adhered to the substrate 11.
[0006]
[Problems to be solved by the invention]
However, in the conventional cap pressurizing jig 15 shown in FIG. 4, since the surface of the rubber 16 in contact with the top surface of the cap 12 is flat, the dent marks of the cap 12 are formed on the surface of the rubber 16 over time. Will be attached. When the cap pressing jig 15 having the dent mark on the rubber 16 is set on the collective substrate 10, there is a problem that the cap 12 is displaced with respect to the dent mark on the rubber 16 with respect to the substrate 11. For this reason, the cap pressurizing jig 15 shown in FIG. 4 has to replace the rubber 16 when the dent mark is formed on the rubber 16, and the labor cost for replacing the rubber 16 and the replacement of the rubber 16 to be replaced. There has been a problem that the cost for maintenance and management of the cap pressurizing jig 15 including cost and the like increases.
[0007]
Further, the conventional cap pressurizing jig 20 shown in FIG. 5 has a relatively complicated structure for pressurizing the top surface of the cap 12, and thus the jig itself is expensive. Further, it is inevitable that an adhesive or the like adheres to the sliding portion of the pin 21 during repeated use, and the sliding portion of the pin 21 must be periodically cleaned. For this reason, the maintenance and management of the cap pressurizing jig 20 are labor-intensive, and there is a problem that the cost for maintaining and managing the cap pressurizing jig 20 increases.
[0008]
An object of the present invention is to provide a cap pressurizing jig that can reduce the manufacturing cost of the main body and can reduce the labor and cost for maintenance and management.
[0009]
[Means for Solving the Problems]
The cap pressurizing jig of the present invention has the following configuration in order to solve the above problems.
[0010]
(1) When a cap that covers an electronic component placed on a circuit board is bonded, the pressure member includes a pressure member that presses the top surface of the cap, and the pressure member is formed of an elastic member having an appropriate elastic force. In other words, protrusions smaller than the top surface of the cap are formed on the surface .
[0011]
In the above configuration, which is an elastic member having a pressure member suitable elastic force is formed, since the surface shape was a shape having a smaller protrusion than the top surface of the cap, simple and inexpensive pressure member When the protrusion is brought into contact with the top surface of the cap and pressurized, the protrusion does not protrude from the top surface of the cap. Therefore, since the dent mark on the top surface of the cap is not formed on the pressure member, the problem that the cap is displaced from the circuit board due to the influence of the dent mark on the pressure member as in the prior art does not occur. In addition, since the pressure member does not have a dent mark on the cap, the life of the jig body is extended, and the labor and cost for maintenance and management can be reduced.
[0014]
(2) The pressure member is formed of rubber.
[0015]
In this configuration, since the pressure member is a rubber molded product, the manufacturing cost of the jig body can be further reduced.
[0016]
(3) A plurality of the protrusions are formed on the pressure member.
[0017]
In this configuration, since a plurality of protrusions are formed, it can be used as a cap pressurizing jig when a cap is attached to each circuit on a collective substrate on which a plurality of circuits are formed on a printed circuit board.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a cap pressurizing jig according to an embodiment of the present invention will be described. The cap pressurization jig of this embodiment is a cap pressurization jig that is used when a shield cap is attached to each circuit on an assembly board in which a plurality of predetermined circuits are formed on a printed circuit board. . As shown in FIG. 1, the collective substrate 1 is obtained by dividing a printed circuit board 2 (hereinafter simply referred to as a substrate 2) into a plurality of regions, and a predetermined circuit is formed for each of the divided regions. FIG. 1 shows an aggregate substrate 1 in which a substrate 2 is divided into m × n (m and n are positive integers) regions, and a predetermined circuit is formed in each of a plurality of divided regions (m × n). Yes. Reference numeral 3 shown in FIG. 1 denotes a cap that covers a predetermined circuit formed for each region. Although not shown, electronic components such as piezoelectric elements are arranged inside the cap 3. Thus, a predetermined circuit is formed. Note that the collective substrate 1 shown in FIG. 1 is used as a plurality of circuit boards by being cut along broken lines shown in the figure.
[0019]
2A and 2B are views showing a cap pressurizing jig according to an embodiment of the present invention. FIG. 2A is a plan view of the cap pressurizing jig, and FIG. 2B is a side view. The cap pressing jig 5 of this embodiment is used in the process of bonding the cap 3 covering a predetermined circuit to the substrate 2, which is one of the manufacturing processes of the collective substrate 1 shown in FIG. . As shown in FIG. 2, the cap pressurizing jig 5 is obtained by attaching a rubber 7 having an appropriate elastic force to a plate 6. The rubber 7 is formed by molding a plurality of protrusions 7a on the surface. As described above, the cap pressing jig 5 of this embodiment is used when the cap 3 covering a predetermined circuit is bonded and fixed to the substrate 2 in the manufacturing process of the collective substrate 1 shown in FIG. Thus, there are a plurality (m × n) of protrusions 7 a formed on the surface of the rubber 7, and the positions where the protrusions 7 a are formed are the attachment positions where the cap 3 is attached on the collective substrate 1. It corresponds. Further, the vertical and horizontal lengths of the protrusions 7a are shorter than the vertical and horizontal lengths of the top surface of the cap 3, respectively. The plate 6 is a metallic plate.
[0020]
Next, a method of using the cap pressing jig 5 of this embodiment will be described with reference to FIG. The collective substrate 1 is provided with a cap 3 for each predetermined circuit formed. At this time, the adhesive applied to the adhesive surface between the cap 3 and the substrate 2 is not cured. The operator sets the cap pressing jig 5 on the collective substrate 1 in this state. At this time, the operator positions the cap pressing jig 5 with respect to the collective substrate 1 so that each protrusion 7a of the rubber 7 abuts on the top surface of the corresponding cap 3, and sets a set tool (not shown). Each projection 7a is set to a state where the top surface of the cap 3 is pressurized (the state shown in FIG. 3). The set tool holds the state in which the top surface of the cap 3 is pressurized by the protrusions 7a. When the setting of the cap pressurizing jig 5 to the collective substrate 1 is completed, the operator puts it into a curing furnace and cures the adhesive applied to the adhesive surface between the cap 3 and the substrate 2.
[0021]
Here, since the vertical and horizontal lengths of the protrusions 7a are shorter than the vertical and horizontal lengths of the top surface of the cap 3, respectively, the protrusions protrude from the top surface of the cap 3 when set in the state shown in FIG. The part 7a does not protrude. Therefore, even if the use of the cap pressurizing jig 5 is repeated, the dent mark of the cap 3 is not formed on the protruding portion 7a. Therefore, the replacement frequency of the rubber 7 in the cap pressurizing jig 5 can be reduced, the cost for maintenance and management of the cap pressurizing jig 5 can be suppressed, and the indentation as in the conventional jig is performed. The problem that the mark moves the cap 3 does not occur. The replacement work of the rubber 7 is an operation of peeling off the rubber 7 bonded to the plate 6 and bonding a new rubber 7 to the plate 6. Further, the rubber 7 having the projection 7a used in the cap pressurizing jig 5 of this embodiment can be easily molded and the cost is low, so that the manufacturing cost of the jig body can be reduced. .
[0022]
What is necessary is just to determine the magnitude | size of the protrusion part 7a shape | molded on the surface of the rubber | gum 7 in the cap pressurization jig | tool 5, a position, a number, etc. according to the aggregate substrate 1 which adhere | attaches the cap 3. FIG. Further, it is desirable that the size of the protruding portion 7a is about 70 to 80% of the size of the top surface of the cap 3.
[0023]
Finally, the results of cost comparison between the conventional cap mounting jig shown in FIG. 5 and the cap mounting jig of the above embodiment are shown.
(1) The manufacturing cost of the jig body can be significantly reduced to about 56% of the conventional jig shown in FIG.
(2) The material and labor costs for jig maintenance and management are about 2% (material cost) and 6% (labor cost) for the conventional jig shown in Fig. 5, respectively. The reduction effect was obtained.
[0024]
【The invention's effect】
As described above, according to the present invention, since the shape of the pressure member formed by the elastic member having an appropriate elastic force is a shape having a protrusion smaller than the top surface of the cap, There is no dent mark on the top of the cap. Therefore, there is no problem that the dent mark on the top surface of the cap on the pressing member shifts the cap, and the cost for maintaining and managing the cap pressing jig can be greatly reduced. Furthermore, since the pressing member can be easily manufactured by molding rubber, the manufacturing cost of the jig body is also reduced.
[Brief description of the drawings]
FIG. 1 is a view showing a collective substrate.
FIG. 2 is a view showing a cap pressing jig according to an embodiment of the present invention.
FIG. 3 is a view showing a state in which a cap pressing jig according to an embodiment of the present invention is set on a collective substrate.
FIG. 4 is a view showing a conventional cap pressing jig.
FIG. 5 is a view showing a conventional cap pressing jig.
[Explanation of symbols]
1-Assembly board 2-Printed circuit board (board)
3-cap 5-cap pressurizing jig 6-plate 7-rubber 7a-projection

Claims (3)

A pressure member that pressurizes the top surface of the cap when bonding a cap that covers the electronic component disposed on the circuit board;
The pressurizing member is a cap pressurizing jig in which an elastic member having an appropriate elastic force is formed, and a protrusion smaller than the top surface of the cap is formed on the surface. The cap pressing jig according to claim 1 , wherein the pressing member is formed by molding rubber. The cap pressing jig according to claim 1, wherein a plurality of the protrusions are formed on the pressing member.

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