JP2010102874A - Ground connecting elastic member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve assembling work efficiency in connection of a ground spring with a capacitor while ensuring its compactness. <P>SOLUTION: The ground spring formed of a linear metallic elastic body includes a circular part to be electrically connected to a metallic casing of the capacitor mounted on an electronic circuit board by elastic engagement, and a chip connection part to be electrically connected by being inserted to a spring connection part formed on the electronic circuit board, which is provided at one end thereof. An opening part of the ground spring is formed so as not to be located on the side of the electronic circuit board when it is held on the capacitor, whereby the ground spring can be prevented from flying out during inserting operation. Thus, the assembling workability can be improved while ensuring the compactness. A projection-like bent part is formed in the middle of the circular part, and the bent part is disposed at a corner formed by the capacitor and the electronic circuit board, whereby the assembling workability is further improved while ensuring the compactness. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an earth connection elastic member used for an electronic apparatus.

Video cameras and digital still cameras are often equipped with flash light emitting devices that are used when taking still images.
For flash emission, it is necessary to mount a large-capacity capacitor, but the metal casing may not be securely connected to the negative pole of the capacitor inside.
In that case, it is necessary to secure a predetermined distance from the metal casing to the surface of the outer casing in order to prevent an electric shock accident from the metal casing. However, it has become difficult to secure this distance in recent miniaturization, and there is a method for miniaturization by connecting the metal casing to the negative pole by another means as a countermeasure.
Conventionally, as a specific means, there is a method of connecting a metal casing of a capacitor and a negative pole of an electronic circuit using an earth connection spring formed of a metal spring material.
A conventional ground connection spring will be described below.

4 to 6 show a conventional ground connection spring.
In FIG. 4, the capacitor 2 is provided with a negative electrode terminal 2b and a positive electrode terminal 2c for connection to the electronic circuit board 1.
A flash light emitting circuit (not shown) is mounted on the electronic circuit board 1, and a negative pole connecting portion 1b and a plus portion, which are openings in which copper foil lands for connecting the capacitor 2 by soldering are formed. A pole connection 1c is provided.
The negative electrode connecting portion 1b and the metal frame (not shown) are electrically connected and grounded via a copper foil pattern.
A constricted portion 2 d is formed in the metal housing 2 a of the capacitor 2.
The ground connection spring 3 is formed with a tip connection portion 3a, a circular arc portion 3b, and a tip R portion 3c, one of which opens to form an opening 3e. A holding portion 3d bent in a U shape is formed in the middle of the arc portion 3b.
The bending radius of the arc portion 3b is smaller than the radius of the constricted portion 2d of the capacitor 2.
The electronic circuit board 1 is provided with a spring connection part 1a which is an opening in which a copper foil land is formed. The spring connection part 1a and the negative electrode connection part 1b are formed of a copper foil pattern of the electronic circuit board 1. Electrically connected.
About the conventional earth connection spring comprised as mentioned above, the operation | movement is demonstrated using FIGS. 4-6.
As shown in FIG. 4, the holding part 3d of the ground connection spring 3 is first pinched with a finger and inserted into the constricted part 2d of the capacitor 2 from the opening 3e. At this time, the negative electrode terminal 2b and the positive electrode terminal 2c are inserted so that the direction of the tip connection part 3a is substantially the same.
Since there is the tip R portion 3c, the ground spring 3 is smoothly inserted without being caught.
Since the bending radius of the circular arc portion 3b is formed in advance smaller than the radius of the constricted portion 2d of the capacitor 2, the ground spring 3 is elastically biased to the metal casing 2a of the capacitor 2 in the inserted state, and is electrically Secure continuity.
Further, the direction of the minus pole terminal 2b and the plus pole terminal 2c and the direction of the tip connection portion 3a are held substantially in the same direction by the frictional force due to the bias.
Next, the capacitor 2 is attached to the electronic circuit board 1 in this state.
The tip connection part 3a, the negative electrode terminal 2b and the positive electrode terminal 2c are inserted into the respective openings of the spring connection part 1a, the negative electrode connection part 1b and the positive electrode connection part 1c, and these three parts are connected by soldering. To do. (State of FIG. 6)
In this state, the metal housing 2a of the capacitor 2 is electrically connected to the negative electrode connection portion 1b of the electronic circuit board 1 through the ground connection spring 3, and a metal frame (not shown) through the copper foil pattern. Are electrically connected and grounded to complete the assembly.
Note that there are the following documents related to the present invention (see Patent Document 1).
JP-A-9-135523

Conventionally, it is a very difficult operation to simultaneously insert two terminals provided on the capacitor 2 and a total of three terminals of the ground connection spring 3 into the three openings of the electronic circuit board 1. . For this reason, when one of the tips is sometimes pressed against the electronic circuit board 1 without entering the opening, the position is often finely adjusted.
However, in the conventional configuration, when the tip connection portion 3a of the ground connection spring 3 is pushed into the electronic circuit board 1 without being inserted into the spring connection portion 1a, the ground connection spring 3 is pushed up as shown in FIG. There was a risk that it would fly away from the condenser 2 and the workability was poor.
Also, even if the ground connection spring 3 does not come off, the ground connection spring 3 and the condenser 2 rotate against the frictional force so that the phase is shifted and the insertion is further difficult. It was necessary to perform the insertion work again.

Therefore, in order to be able to insert each terminal of the capacitor 2 after the tip connecting part 3a is securely inserted into the spring connecting part 1a first, the tip connecting part 3a is connected to each terminal of the capacitor as shown in FIG. However, it is necessary to intentionally lengthen only the dimension A, which has a problem of hindering miniaturization.
In addition, a holding part bent in a U-shape for pinching with a finger is also required only for the dimension B as shown in FIG.
As a result, the dimension C, which is required only by the dimension A and the dimension B, is a major obstacle to miniaturization.
This invention solves the said subject, and it aims at improving assembly workability | operativity, protecting size reduction.

In order to achieve this object, the ground connection elastic member of the present invention is an arc-shaped ground connection elastic member that engages with a cylindrical electronic component, and includes an opening and a projecting connection portion at the tip. The insertion direction of the connection terminal of the electronic component to the printed circuit board to which the electronic component is connected and the insertion direction of the protruding connection portion of the ground connection elastic member to the printed circuit board are engaged so as to be substantially in the same direction. In this case, the opening is not located on the printed circuit board side.
That is, an arcuate portion that is elastically fitted to a metal housing of a cylindrical electronic component that is attached to a printed circuit board and electrically connected thereto is formed, and is electrically connected by being inserted into a connection hole formed in the printed circuit board. An earth connection elastic member formed of a linear metal elastic body provided at one end with a connecting portion to be opened so that the opening is not located on the printed circuit board side when held by the columnar electronic component. It has the structure characterized by having formed.

The present invention forms an arc-shaped portion that is elastically fitted to a metal casing of a capacitor to be attached to a printed circuit board and electrically connected thereto, and is electrically connected by being inserted into a spring connecting portion formed on the printed circuit board. An earth connection spring formed of a linear metal elastic body with a tip connection part at one end, and its opening is formed so that it is not located on the printed circuit board side when held by a capacitor. Since it is possible to prevent the ground connection spring from coming off and flying during work, assembly workability can be improved while keeping downsizing.
In addition, a protruding bent part is formed in the middle of the arc-shaped part, and the bent part is arranged at the corner formed by the capacitor and the printed circuit board to further improve the assembly workability while keeping the size small. Can do.
In this manner, the present invention can greatly improve workability without sacrificing downsizing.

The present invention
An arc-shaped portion that is elastically fitted to a metal housing of a cylindrical electronic component to be attached to a printed circuit board and electrically connected thereto, and is electrically connected by being inserted into a connection hole formed in the printed circuit board An earth connection elastic member formed of a linear metal elastic body provided at one end, and formed so that the opening is not located on the printed circuit board side when held by the cylindrical electronic component. As a result, assembly workability can be improved while keeping downsizing.
(Embodiment)
Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 3. 1 to 3 show the ground connection elastic member of the present embodiment.
In FIG. 1, a capacitor 102 that is a cylindrical electronic component is provided with a negative electrode terminal 102 b and a positive electrode terminal 102 c that are connection terminals for connection to an electronic circuit board 101 that is a printed circuit board to which the electronic component is connected. Has been.
A flash light emitting circuit (not shown) is mounted on the electronic circuit board 101, and a negative pole connecting portion 101b and a plus portion, which are openings formed with copper foil lands for connecting the capacitor 102 by soldering. A pole connection part 101c is provided.
The negative electrode connecting portion 101b and the metal frame (not shown) are electrically connected and grounded via a copper foil pattern.
In addition, the electronic circuit board 101 is provided with a storage opening 101 d that is an opening for storing the capacitor 102.
The metal casing 102a of the capacitor 102 is made of an aluminum material and has a constricted portion 102d.
The earth connection spring 103, which is an arc-shaped earth connection elastic member, is formed of Ni-plated spring steel wire.
A tip connection portion 103a that is a protruding connection portion that is electrically connected, an arc portion 103b that is an arc-shaped portion that is electrically connected by elastically fitting to a metal housing of a cylindrical electronic component, and a tip R Part 103c is formed, and one part is opened to form an opening part 103e. The arc portion 103b is formed with a holding portion 103d that is a restriction bending portion.
In a state where the direction of the tip connection portion 103a and the directions of the negative electrode terminal 102b and the positive electrode terminal 102c are arranged in substantially the same direction, the opening 103e is not positioned on the electronic circuit board 101 side ( Next to the capacitor 102).
Similarly, in this state, the holding portion 103d is formed so as to be located on the opposite side of the capacitor 102 and in the vicinity of both the capacitor 102 and the electronic circuit board 101 as shown in FIG. ing.
The bending radius of the arc portion 103b is smaller than the radius of the constricted portion 102d of the capacitor 102.
The electronic circuit board 101 is provided with a spring connection part 101a which is an opening in which a copper foil land is formed. The spring connection part 101a and the negative electrode connection part 101b are electrically connected with the copper foil pattern of the electronic circuit board 101. Connected.
The operation of the ground connection spring of the present embodiment configured as described above will be described with reference to FIGS.
As shown in FIG. 1, the holding portion 103d of the ground connection spring 103 is first pinched with a finger and inserted into the constricted portion 102d of the capacitor 102. At this time, the negative electrode terminal 102b and the positive electrode terminal 102c are inserted so that the direction of the tip connection part 103a is substantially the same.
Since there is the tip R portion 103c, the ground connection spring 103 can be smoothly inserted without being caught.
Since the bend radius of the arc portion 103b is formed in advance smaller than the radius of the constricted portion 102d of the capacitor 102, the ground connection spring 103 is elastically biased to the metal casing 102a of the capacitor 102 in the inserted state, Continuity is ensured.
In addition, the direction of the negative electrode terminal 102b and the positive electrode terminal 102c and the direction of the tip connection part 103a can be held with substantially the same direction by the frictional force due to the bias.
Next, the capacitor 102 is attached to the electronic circuit board 101 in this state.
The tip connection part 103a, the negative pole terminal 102b, and the positive pole terminal 102c are inserted into the openings of the spring connection part 101a, the negative pole connection part 101b, and the positive pole connection part 101c, respectively.
At this time, the capacitor 102 is accommodated in the accommodation opening 101 d of the electronic circuit board 101.
After the insertion as described above, the metal housing 102a of the capacitor 102 is connected to the negative electrode connection portion 101b of the electronic circuit board 101 via the ground connection spring 103 by connecting the three places by soldering as shown in FIG. Is electrically connected to and grounded with a metal frame (not shown) through a copper foil pattern, and the assembly is completed.
As shown in FIG. 2, when inserting, if the tip connection part 103a does not enter the hole of the spring connection part 101a well, the opening part 103e is not located on the electronic circuit board 101 side. Since it is formed, there is no possibility that the ground connection spring 103 will fly off from the capacitor 102 as in the conventional example, so that the assembly workability is improved. Therefore, in the conventional example, the tip connection portion 3a is made longer by the dimension A as a countermeasure, but this is not necessary in the present embodiment.
Further, as shown in FIG. 6, the holding portion 103d is formed so as to be disposed on the opposite side of the capacitor 102 from the tip connection portion 103a, in the vicinity of the capacitor 102, and in the vicinity of the electronic circuit board 101. Since it is arranged behind the curvature of the electronic circuit board 101 and the capacitor 102, it does not pop out by the dimension B as in the conventional example, so that miniaturization is not hindered.
For this reason, since the dimension A and the dimension B which were necessary in the conventional example are not necessary, the present embodiment can be downsized accordingly.
Further, in the present embodiment, the capacitor 102 is accommodated in the housing opening 101d of the electronic circuit board 101, so that the dimension D can be significantly reduced as compared with the dimension C required in the conventional example.
Further, since the holding portion 103d hits the electronic circuit board 101, the ground connection spring 103 and the capacitor 102 are against the frictional force even when the tip connection portion 103a does not enter the hole of the spring connection portion 101a. It is possible to prevent the rotation and the phase from deviating greatly.
In the present embodiment, the ground connection spring 103 is formed of a Ni-plated spring steel wire, but the same effect can be obtained as long as the elastic body has a conductive surface.
For example, a metal material that is not plated may be used, or a resin material that has been subjected to conductive treatment may be used.
Moreover, it does not necessarily need to be a wire, and may be a leaf spring shape.
Further, it is not always necessary to use a spring, and an elastic member having a shape that gives elasticity by cutting out a part of the case holding the condenser may be used. For example, the same effect can be obtained if the case is made of metal, or if the capacitor holding case using a resin as a base material is provided with conductivity by metal plating or metal insert molding.

Since the ground connection elastic member according to the present invention can prevent the ground connection elastic member from coming off and flying at the time of insertion into the printed circuit board, the assembly workability can be improved while keeping downsizing. It can be widely applied not only to cameras but also to printed circuit boards for various devices.

The perspective view of the earth connection elastic member of embodiment of this invention Effect explanatory drawing of the ground connection elastic member of embodiment of this invention The side view of the earth connection elastic member of embodiment of this invention A perspective view of a conventional ground connection elastic member Explanatory diagram of conventional ground connection elastic member Side view of a conventional ground connection elastic member

Explanation of symbols

DESCRIPTION OF SYMBOLS 101 Electronic circuit board 101a Spring connection part 101b Positive terminal connection part 101c Negative terminal connection part 101d Storage opening part 102 Capacitor 102a Metal housing 102b Negative terminal 102c Positive terminal 102d Constriction part 103 Earth connection spring 103a Tip connection part 103b Arc part 103c Tip Connection part 103d Holding part 103e Opening part

Claims (2)

An arc-shaped ground connection elastic member that engages with a cylindrical electronic component,
Provided with an opening and a projecting connection portion at the tip,
When the insertion direction of the connection terminal of the electronic component to the printed circuit board to which the electronic component is connected and the insertion direction of the protruding connection portion of the ground connection elastic member to the printed circuit board are substantially directed in the same direction. The opening is not located on the printed circuit board side. Further comprising a regulation bending portion formed at a predetermined distance from the protruding connection portion,
2. The protruding connection portion and the restriction bending portion abut on / regulate the printed circuit board at a position where the electronic component engaged with the ground connection elastic member is inserted into the printed circuit board. The ground connection elastic member as described in 2.

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