JPH075657Y2 - Electrical circuit connection structure - Google Patents

Description

The present invention relates to a structure for electrically connecting a printed circuit board to another printed circuit board or component in an electronic device in an electric circuit manner.

(B) Conventional technology As a method for electrically connecting printed circuit boards to each other or to printed circuit boards and other components in the electrical circuit, in the case of a flexible printed circuit board, a predetermined part of the conductor pattern of the printed circuit board is matched with the corresponding conductor pattern of the other party Then, there is a method of stacking the printed circuit board on the counterpart component or the printed circuit board and fixing the both. A conventional structure for carrying out this method was as shown in FIG. In this figure, 5 and 6 are flexible printed circuit boards electrically connected to each other, and conductor patterns connected to each other are formed on the lower surface of the upper printed circuit board 5 and the upper surface of the lower printed circuit board 6, respectively. The printed circuit boards 5 and 6 are superposed on each other by combining the conductor patterns thereof, and the rubber plate 7 made of cushion material is placed on the printed circuit boards 5 and 6, and these three are mounted on the base plate 8
It is sandwiched between the push plate and the push plate 9 and the push plate is fastened to the base plate with two screws 10 to fix the two printed circuit boards and to secure the contact pressure between the conductor patterns. There is.

(C) Problems to be solved by the invention In the above-described conventional configuration, two or more screws are required to connect the printed circuit boards, and therefore the screwing work during assembly is increased and the contact pressure between the conductor patterns is applied to the screws. It is necessary to tighten the screws fairly strongly in order to obtain sufficient pressure at the place where the contact pressure is the smallest, because it becomes non-uniform at near and far places, and the machine of the base plate 8 and the push plate 9 Since they are required to have high mechanical strength, they become thick and thick, which is disadvantageous in terms of parts cost and structural space. To connect two printed boards, the conductors of both boards are connected by soldering, and the boards are connected by screws.However, when there are multiple pairs of conductors to connect, Since each of them was soldered one by one and the boards were joined together with screws, the number of operations was large and inefficient.

The present invention is intended to solve the above problems.

D. Means for Solving the Problem The present invention is
These were arranged around a predetermined center, they were sandwiched by the sandwiching parts, and at the center, the sandwiching parts were fastened with a single screw.

E action Since the conductor pattern is arranged around the center and the printed circuit board is tightened at the center of its circumference, the tightening pressure of each conductor becomes almost uniform even if tightened with a single screw.

F. Embodiment The illustrated embodiment is one in which the present invention is applied to a camera. In FIG. 2, 1 is a camera body, and 2 and 3 are switch push buttons provided on the upper surface of the camera body. The push button 2 is, for example, a switch operation button for changing the film sensitivity data set in the exposure control circuit of the camera.
The push button 3 is a switch push button for switching the set value of the exposure correction value. Reference numeral 4 denotes an upper cover of the camera, and the push button described above is attached to this upper cover. When the upper cover 4 is removed, the flexible printed circuit board appears along the inner surface of the upper cover. The printed circuit boards are stacked in two layers, and an electrical circuit connection is made between the two printed circuit boards. The present invention relates to this electrical circuit connection, and in this embodiment, the above-mentioned electrical circuit is connected. The upper and lower covers 4 of the above-mentioned printed circuit boards are simultaneously connected by the structure
It also has a structure to be fixed to.

FIG. 1 shows the structure around the switch operated by the push buttons 2 and 3 in the above-mentioned camera. Reference numerals 5 and 6 are flexible printed circuit boards, and 8 is a base plate. The printed circuit boards 5 and 6 and the base plate 8 are provided with through holes 5a, 6a and 8a, respectively, and although not shown in FIG. 1, the lower surface of the printed circuit board 5 and the upper surface of 6 are concentric with the holes 5a and 6a. Print pattern connecting portions which are to be brought into contact with each other are formed. The states of these print patterns are shown in FIG. 3 and will be described in detail later. 7 is a rubber washer. The printed circuit boards 5 and 6 and the base plate 8 are overlapped with the through holes 5a, 6a and 8a aligned with each other, and the rubber washer 7 is further stacked thereon with the center hole thereof aligned with the through holes 5a, 6a and 8a. 11
Is a push plate, and a boss portion that fits through holes 5a, 6a, 8a, etc. is provided on the lower surface of the push plate, and this boss portion is provided from above the rubber washer 7 to the base plate 8
Through the through holes 5a, 6a, 8a, and then screw 12 from the upper surface of the camera upper cover 4 into the center hole of the boss portion of the pressing plate 11.
11a, and a nut 13 is screwed from the lower surface of the base plate 8 to the tip of the screw 12 to connect the printed circuit boards 5 and 6 in an electric circuit manner and to be fixed to the inner surface of the upper cover of the camera (fourth).
See figure).

FIG. 3 shows print patterns on the printed circuit boards 5 and 6.
The printed patterns 5b to 5i on the printed circuit board 5 are connected to the printed patterns 6b to 6i on the printed circuit board 6, and the printed patterns having the same alphabetic suffix on both printed circuit boards are in contact with each other. As described above, these print patterns are arranged on the circumference concentric with the through holes 5a and 6a.

FIG. 4 is a longitudinal sectional view taken along a plane including the center line of the screw 12 shown in FIG. A protrusion 11b is formed on the lower surface of the push plate 11 at a position directly above the print patterns 5b, 6b, etc. of the printed circuit board. This protrusion presses the print patterns 5b, 6b to 5i, 6i of the printed circuit board from above the rubber washer 7, but the pressing force is higher than that of the entire lower face of the pressing plate 11 without pressing the entire upper face of the rubber washer 7. Since they are concentrated on 5b, 6b, etc., sufficient contact pressure between the print patterns can be easily obtained. Two corners 11c, 11c are provided on the upper surface of the push plate 11 so that the protrusion 11b of the push plate can be accurately positioned on each print pattern. It is designed to be inserted into 4a (see also Fig. 1). Further, a locking portion 11d is formed downward from the push plate 11 so as to be locked in the engaging holes 5k, 6k of the printed circuit boards 5, 6. With these configurations, the direction of the push plate 11 with respect to the camera upper cover and the printed boards 5 and 6 is determined.

Returning to FIG. 1, a supplementary explanation will be given. A decorative plate 14 covers the heads of the screws 12 exposed on the camera upper cover 4. Push plate
The wing pieces 11e are integrally formed on the front and rear of the camera 11, and the lower surfaces of the push buttons 2 and 3 contact the upper surfaces of these wing pieces, and the lower surfaces of these wing pieces are attached to the printed circuit board 6. When the push button 2 or 3 is pressed against the corresponding switch leaf springs 15a and 15b, the switch leaf springs 15a or 15b thereunder are pressed via the blade 11e. The leaf springs 15a and 15b are dish-shaped and have an upward convex shape. The switch leaf springs 15a and 15b are bridge portions 1
It is a single plate member connected by 5c, the tongue piece 15d is connected to the printed pattern 6l shown in FIG. 3 by screws, and the printed circuit board 6 is provided under the leaf springs 15a, 15b. The print patterns 6m and 6n are provided on the upper side, and the leaf springs 15a and 15b are disc-shaped having an upward convex shape. Therefore, the leaf springs 15a and 15b are usually separated from the print patterns 6m and 6n. When the leaf springs 15a or 15b are bent back, the leaf springs and the printed patterns 6m and 6n are electrically connected.

The arrangement of the conductor parts to be connected to each other is not limited to a single circumference centered on one point. It goes without saying that they may be arranged, for example, as shown in FIG. 5, such as a regular polygon centered on one point (FIG. 5A) or concentric circles (FIG. 5B). This P is a connecting conductor, and a screw is passed through the central hole H. In short, the object of the present invention is achieved by arranging the conductor portion around the single screw for fastening the printed circuit board. That is, an irregular arrangement as shown in FIG. 5C may be used.

The present invention is configured as described above, and the conductor portion to be interconnected is arranged around one tightening screw. Therefore, only one screw is used to connect the boards to each other and to conduct the conductor without soldering work. Since they can be connected to each other and each conductor pair can be pressed against each other with a substantially uniform pressure, excessive tightening as a whole in order to obtain sufficient contact pressure in the conductor pair with the lowest contact pressure as in the past. It eliminates the problem that it requires force, so there is no need to increase the strength of the base plate, push plate, etc., and since only one screw is required, the number of screw tightening operations can be reduced and the product cost can be reduced. It is a big advantage. As described in the section of the embodiment, by forming the projection on the lower surface of the pressing plate, it becomes easier to secure the contact pressure of the conductor connecting portion.

[Brief description of drawings]

1 is an exploded perspective view of an embodiment of the present invention, FIG. 2 is a rear view of a camera to which the same embodiment is applied, FIG. 3A is a printed circuit board 5, and FIG. 3B is a printed circuit board 6. Top view, 4th
The figure is a vertical cross-sectional view including the center line of the screw 12 in FIG. 1, FIGS. 5A, B, and C are plan views showing arrangement examples of conductor portions to be connected to the counterpart, and FIG. 6 is a vertical cross-sectional view of a conventional example. It is a figure. 5a, 6a …… Center, 5b, 5c, 5d, 5e, 5f, 5g, 5h, 5i, 6b, 6c, 6d, 6
e, 6f, 6g, 6h, 6i …… conductor, H …… center, P …… conductor, 12
...... Screw, 8,11 …… Clamping part.

Claims (1)

[Scope of utility model registration request] 1. A plurality of conductors centered on a predetermined point on one printed circuit board and arranged around the center, and superposed in a state of facing and paired with the conductors on another printed circuit board. A plurality of other conductors arranged as described above, and the two printed circuit boards on which the pair of conductors are stacked so as to face each other, the conductors forming a pair at a predetermined point. An electrical circuit connection structure that consists of screws that are clamped and clamped so that they are pressed into contact with.