JP2000012113A - Earth spring device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an earth spring device which can be deformed to be contacted along a contact surface of an upper case to improve the contact condition, and by which the undesired deformation and fracture of an earth spring in the mounting and demounting of the case can be prevented. SOLUTION: An end of an earth spring body 1 is located approximately in parallel with an upper case when the upper case 2 is loaded on a lower case 4 by providing the earth spring body 1 with a first and second inclination parts 1b, 1c, whereby the separation of the conductive coating applied on the upper case 2 can be reduced. Further by mounting a locking portion 1d to the end of the earth spring body 1, the locking portion 1d is contacted with a rear surface of a printed board 3 when the upper case 2 is removed, whereby, the undesired deformation and fracture of the earth spring body 1 can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ground spring device used for video and audio equipment such as a video tape recorder and a stereo, and information equipment such as a printer.

[0002]

2. Description of the Related Art Conventionally, various ground springs and the like have been used in audiovisual equipment and information equipment.

[0003] A conventional earth spring will be described below. FIG. 4 is a cross-sectional view of an electronic device using the conventional earth spring device, and FIG. 5 is a plan view showing the vicinity of the earth spring in the conventional earth spring device shown in FIG. FIG. 6 is a perspective view showing the configuration of a conventional earth spring alone. In the figure, 3 is a printed circuit board on which various components are mounted, 2 and 4 are an upper case and a lower case forming the outer shape of the electronic device body,
It is made of resin material and its surface is coated with conductive paint such as aluminum. 2a is a rib provided at the lower end of the upper case 2 so as to engage with the lower case 4, and 1 is a ground spring main body connected to the ground pattern of the printed circuit board 3 and grounded to the case 2, as shown in FIG. Elastically deformed in the direction of arrow A from the appropriate state. 1a is an inclined portion of the ground spring main body 1, and 5 is a grounded main body 1 of the printed circuit board 3.
It is a screw for fixing to.

The operation of the conventional earth spring device configured as described above will be described below.

First, on the printed circuit board 3 provided in the lower case 4, an earth spring main body 1 shown in FIG. 6 is fixed with screws 5 so as to make electrical contact with a ground pattern (not shown). At this time, the inclined portion 1a of the earth spring body 1
Fix it so that it faces outward as shown in.

Next, when the upper case 2 is inserted from above,
The rib 2a provided at the lower end of the upper case 2 comes into contact with the inclined portion 1a of the ground spring body 1, but the upper case 2
The earth spring main body 1 is elastically deformed as shown by an arrow A in FIG. 6, and the rib 2a rides over the earth spring main body 1 and engages with the end of the lower case 4 as shown in FIG. At this time, the earth spring body 1 and the upper case 2
As shown in FIG. 5, the contact state between the upper case 2 and the end of the earth spring main body 1 is in contact with the upper case 2.
Since the upper case 2 is coated with a conductive coating, a ground current from the printed circuit board 3 via the ground spring main body 1 is transmitted to the upper case 2 and the lower case 4 and grounded.

[0007]

However, when the conductive coating is applied to the resin surface of the upper case 2 as in the above-mentioned conventional configuration, the end of the ground spring main body 1 contacts as shown in FIG. Therefore, there has been a problem that the painted conductive paint is shaved by the end of the earth spring body 1 having a substantially right-angled shape, resulting in incomplete conduction. When removing the upper case 2 from the lower case 4, the rib 2a
However, there is a problem that the end face of the earth spring body 1 is pushed up and the contact portion of the earth spring is deformed, resulting in poor contact and damage to the earth spring.

The present invention solves the above-mentioned conventional problems. The present invention can improve the contact state by deforming the contact along the contact surface of the upper case, and also prevents unnecessary deformation and breakage of the ground spring when attaching and detaching the case. It is an object of the present invention to provide a ground spring device.

[0009]

In order to achieve this object, an earth spring device according to the present invention is an earth spring device which is connected to an earth portion of various circuits and transmits an earth current to a case coated with conductive paint. An elastically deformable earth spring, and an opening provided in a bent portion near a fixing portion of the earth spring, wherein the earth spring is deformed near the opening so as to contact in parallel with the case. is there.

[0010] With such a configuration, the shape of the earth spring main body is provided with the first and second inclined portions so that when the upper case is mounted on the lower case, the end of the earth spring main body and the upper case are substantially parallel. Therefore, the contact area can be increased, and the peeling of the conductive coating applied to the upper case can be reduced.

Also, a printed circuit board provided with various circuits and a ground pattern, a second case to which the printed circuit board is fixed, and a second case which is engaged with the second case and has a surface coated with conductive paint. A first case, an earth spring which is electrically fixed to the printed circuit board and is elastically deformed and capable of contacting the first case; and the printed circuit board provided integrally with the earth spring when the first case is detached. And a locking portion that abuts against the back surface of the grounding member to regulate the deformation of the ground spring.

With such a configuration, by providing the locking portion at the end of the ground spring main body, the locking portion comes into contact with the back surface of the printed circuit board when the upper case is detached, so that unnecessary deformation or damage of the ground spring main body is performed. Can be prevented.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is an earth spring device which is connected to an earth portion of various circuits and transmits an earth current to a case coated with conductive paint, wherein the spring device is elastically deformable. An earth spring, and an opening provided in a bent portion near a fixing portion of the earth spring, wherein the earth spring is deformed near the opening so as to contact in parallel with the case. By providing the first and second inclined portions with the configuration of the earth spring main body, when the upper case is mounted on the lower case, the end of the earth spring main body and the upper case are substantially parallel to each other. The area can be increased, and the peeling of the conductive coating applied to the upper case can be reduced.

According to a second aspect of the present invention, there is provided a printed circuit board provided with various circuits and a ground pattern, a second case to which the printed circuit board is fixed, a second case which is engaged with the second case, and has a surface. A first case coated with a conductive coating, a ground spring that is electrically fixed to the printed circuit board and elastically deformable to be able to contact the first case, and the first spring provided integrally with the ground spring. A locking portion that comes into contact with the back surface of the printed circuit board when the case is detached and restricts deformation of the ground spring.With such a configuration, the locking portion is provided at the end of the ground spring main body. When the upper case is detached, the locking portion comes into contact with the back surface of the printed circuit board, so that unnecessary deformation and breakage of the ground spring body can be prevented.

An embodiment of the present invention will be described below with reference to the drawings. (Embodiment 1) FIG. 1 is a cross-sectional view showing the configuration of an electronic device using the earth spring device of the present embodiment, FIG. 2 is a plan view showing a state near the earth spring in the state shown in FIG. 1, and FIG.
FIG. 2 is a perspective view showing a configuration of a single earth spring of the present embodiment.

In FIG. 1, reference numeral 3 denotes a printed circuit board on which various components are mounted, and reference numerals 2 and 4 denote an upper case and a lower case, which are first and second cases for forming the outer shape of the electronic device body. The surface is coated with a conductive material such as aluminum. 2a is a rib provided at the lower end of the upper case 2 so as to engage with the lower case 4, and 1 is a ground spring main body connected to the ground pattern of the printed circuit board 3 and grounded to the case 2, as shown in FIG. Elastically deformed in the direction of arrow A from the appropriate state. 1a is a first inclined portion of the ground spring main body 1, 1b is an opening provided in a bent portion of the ground spring main body 1, 1c is a second integrally provided substantially at a right angle to the first inclined portion 1a. The inclined portion 1d is provided integrally with an end portion of the second inclined portion 1c, and is a locking portion formed by being bent upward, and 5 is a screw for fixing the earth spring main body 1 to the printed circuit board 3.

The operation of the earth spring device of the present embodiment configured as described above will be described below.

First, the ground spring main body 1 shown in FIG. 6 is fixed to the printed board 3 provided in the lower case 4 with screws 5 so as to make electrical contact with a ground pattern (not shown). At this time, the first inclined portion 1a of the ground spring body 1
Is fixed to face outward as shown in FIG.

Next, when the upper case 2 is inserted from above,
The rib 2a provided at the lower end of the upper case 2 comes into contact with the first inclined portion 1a of the ground spring main body 1. By moving the upper case 2 as it is, the ground spring main body 1 is moved as shown by the arrow B in FIG. The rib 2a passes over the earth spring main body 1 and the lower case 4 as shown in FIG.
With the end of the At this time, the state of the ground spring main body 1 is deformed so that the contact portion of the ground spring main body 1 is parallel to the upper case 2 near the opening 1b as shown in FIG. Therefore, the contact area between the earth spring main body 1 and the upper case 2 can be increased.

When removing the upper case 2 from the lower case 4, the upper case 2 is moved upward. At this time, the rib 2a comes into contact with the second slope 1c and pushes up. However, since the locking portion 1d abuts on the back surface of the printed circuit board 3 and the deformation is regulated, the ground spring main body 1 is not unnecessarily deformed or damaged.

As described above, according to the present embodiment, the shape of the earth spring body 1 is changed to the first and second shapes as shown in FIG.
By providing the inclined portions 1b and 1c of the upper case 2,
When the is attached to the lower case 4, the end of the earth spring main body 1 and the upper case 2 are substantially parallel, so that the contact area can be increased and the peeling of the conductive paint applied to the upper case 2 is reduced. You can do it.

A locking portion 1 is attached to the end of the ground spring body 1.
When the upper case 2 is provided, the locking portion 1d comes into contact with the back surface of the printed circuit board 3 when the upper case 2 is detached, so that unnecessary deformation and breakage of the ground spring main body 1 can be prevented.

[0023]

As described above, according to the present invention, since the conductive coating applied to the case can be prevented from peeling off, reliable grounding can be achieved, and unnecessary deformation and breakage of the earth spring body can be prevented. It has an effect.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating an example in which an earth spring device according to an embodiment of the present invention is used in an electronic device.

FIG. 2 is a plan view showing a contact state between an earth spring main body and an upper case in the embodiment.

FIG. 3 is a perspective view showing a configuration of a single earth spring in the embodiment.

FIG. 4 is a cross-sectional view showing a configuration in which a conventional earth spring device is used for an electronic device.

FIG. 5 is a plan view showing a state of contact between a conventional earth spring main body and an upper case.

FIG. 6 is a perspective view showing the configuration of a conventional earth spring alone.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Earth spring main body 1a 1st inclined part 1b Opening 1c 2nd inclined part 1d Locking part 2 Upper case 2a Rib 3 Printed circuit board 4 Lower case 5 Screw

Claims (2)

[Claims] 1. An earth spring device connected to an earth portion of various circuits and transmitting an earth current to a case coated with a conductive coating, wherein the earth spring is provided in an elastically deformable earth spring and a bent portion near a fixing portion of the earth spring. An earthed spring, wherein the earth spring is deformed in the vicinity of the opening so as to contact in parallel with the case. 2. A printed circuit board on which various circuits and an earth pattern are provided, and a second circuit board to which the printed circuit board is fixed.
And a first case engaged with the second case and having a conductive coating applied to the surface, and electrically fixed to the printed circuit board to be elastically deformable and capable of contacting the first case. A ground spring integrated with the ground spring, and a locking portion that comes into contact with the back surface of the printed circuit board when the first case is detached and restricts deformation of the ground spring. .