JPS6039955Y2 - sheet keyboard - Google Patents

Description

[Detailed Description of the Invention] (1) Technical Field of the Invention The present invention relates to an improved structure of a sheet-like keyboard in which groups of conductor patterns in the X direction and the Y direction are arranged in a matrix.

(2) Technical Background With the advent of the recent OA era, the production volume of keyboards used for data input is increasing.

In addition, recent keyboards are required to be particularly thin sheet-like keyboards in order to be incorporated into various devices, but since the switch parts are housed within the thin shape, there is a problem in terms of contact reliability.
There is a demand for highly reliable products that are unlikely to cause poor contact.

(3) Prior Art and Problems FIG. 1 shows a part of a conventional sheet-like keyboard in a side sectional view.

In the figure, 1 is a double-sided printed wiring board with conductor patterns formed on both surfaces of a hard substrate such as a baking board, 2 is a conductor pattern in the X direction, 3 is a conductor pattern in the Y direction, and 4 is a spacer made of an elastic sheet such as a rubber material. , 5 is a circular dome-shaped disk spring made of a spring material made of conductive metal such as phosphor bronze, and 6 is a top sheet.

In this method, a spacer 4 having a through hole 4a is adhesively fixed to the front side of a wiring board 1 having conductor patterns 2 and 3 on the front and back sides, and a disk-shaped spring 5 is inserted into the through hole 4a, and a sheet 6 is placed on the surface of the spacer 4.
By pressing the sheet 6 in the through hole 4a portion and elastically deforming the upper part of the disc spring 5 to bring it into contact with the conductor pattern 3, the conductor pattern 3 is moved through the disc spring 5. It is connected to the conductor pattern 2.

In this conventional structure, when the spacer 4 is processed and bonded onto the printed board 1, the adhesive 7 attached to the spacer 4 protrudes into the through hole 4a, causing the disc spring 5 and the conductor pattern 2 to In some cases, this caused poor contact.

(4) Purpose of the invention The present invention solves the above-mentioned object, and provides a sheet-like keyboard that is less prone to such poor contact.

(5) Structure of the invention The purpose of the above invention is to connect multiple X-direction conductor patterns and
In a sheet-like keyboard in which directional conductor patterns are arranged in a matrix at intervals and a switch part is formed at each intersection, and the selected X and Y conductor patterns are electrically connected when the desired switch part is pressed, the X-direction conductor It consists of a hard first wiring board with a pattern formed on its surface and a thermosetting resin film, and the film is thermally deformed to provide circular recesses corresponding to each of the intersection points, and a through hole at the bottom of the recess. a second wiring board including a circular ring pattern portion surrounding the through hole, and a Y-direction conductor pattern formed on the opening side surface of the recess, the Y-direction conductor pattern comprising a line pattern portion connecting the ring pattern portion in the Y direction; , comprising at least a circular dome-shaped disc spring made of a conductive metal housed in the recess, and a film adhered to the surface of the second wiring board;
The second wiring board is fixed on the wiring board so that the opening side surface faces upward and the X-direction conductor pattern is located in the through hole, and the second wiring board is mounted on the ring pattern part in the through hole. This can be achieved by providing a sheet-like keyboard in which a disc-shaped spring is elastically deformed downward by pressure and is in contact with the X-direction conductor pattern.

(6) Examples of ideas An embodiment of the present invention is shown in FIGS. 2 and 3.

In the figure, 8 is a hard single-sided printed wiring board made of a baked board on which a plurality of parallel X-direction conductor patterns 9 are formed, and 10 is a flexible printed wiring board made of a thermosetting resin film such as epoxy resin. A flexible plastic sheet wiring board, 11 is a plurality of parallel Y-direction conductor patterns printed on the surface of the wiring board 10, 12 is a recess, 13 is a through hole, 14 is a dome-shaped disc spring, and 15 is a The flexible top sheet 16 is a presser.

FIG. 2 is a side sectional view partially showing the sheet-like keyboard of the present invention in an assembled state, and FIG. 3 is a perspective view showing the keyboard of FIG. 2 in an unfolded state.

As shown in the figure, the conductor pattern 9 has wide contact lands 9a at a predetermined pitch angle.

In the wiring board 10, a through hole 13 is formed in a plastic sheet, and a conductor pattern 11 consisting of a ring pattern portion 11a surrounding the through hole and a line pattern portion 11b connecting it is formed using photolithography technology or thick film printing technology. It is deposited and formed on the wiring board 10.

Thereafter, the wiring board 10 is heat-pressed to be thermally deformed as shown in FIG. 2, thereby forming a plurality of recesses 12 at predetermined pitch intervals.

The recess 12 is a circular ring projection consisting of a thermally deformed U-shaped bent portion 10a, and a through hole 13 and a ring pattern portion 11a are provided at the inner bottom of the recess 12.

Furthermore, a line pattern portion 11b connecting adjacent ring pattern portions 11a is attached to the surface of the bent portion 10d without being disconnected.

Furthermore, a key function display 15a is printed on the back side of the top sheet 15.

To assemble this keyboard, first, the wiring board 10 is adhesively fixed to the surface of the wiring board 8 with adhesive 17 so that the contact land 9a is located in the through hole 13 of each recess 12, and the X and Y conductor patterns 9 , 11 are arranged in a matrix.

Next, a disc spring 14 is placed on the ring pattern portion 11a in the recess 12 located at each intersection of the matrix, and the switch portion, the waist, and the top sheet 15 are adhesively fixed to the bent portion 10a, thereby manufacturing the present keyboard. .

Then, the top sheet 1
5 with a pusher 16 or the like, the disc spring 14 is reversed and becomes convex downward as shown in FIG. 2, and its lower surface contacts the conductor pattern 9 through the through hole 13. The conductor pattern 11 is electrically connected.

(7) In the sheet-like keyboard according to the present invention, which has more than the effects of the invention, the X and Y conductor patterns are formed on separate wiring boards, and the wiring board with the conductor pattern that supports the disc spring is placed on the back side of the keyboard. Since it is adhesively fixed to the wiring board, even if the bonding adhesive of both wiring boards is squeezed out due to pressure, it hardly gets into the contact area between the disk spring and the conductor pattern.

Therefore, according to the present invention, a highly reliable sheet-like keyboard exhibiting stable contact characteristics can be obtained.

[Brief explanation of drawings]

Fig. 1 is a side sectional view partially showing a conventional sheet-like keyboard, Fig. 2 is a side sectional view partially showing a sheet-like keyboard according to the present invention, and Fig. 3 is the keyboard of Fig. 2 in an expanded state. FIG. Explanation of symbols, 8, 10...Wiring board, 9, 11...
...Conductor pattern, 12...Recess, 13
...Through hole, 14... Disc spring, 15
...Top sheet, 17...Adhesive.

Claims (1)

[Scope of utility model registration request] A plurality of X-direction conductor patterns and Y-direction conductor patterns are arranged in a matrix at intervals, and a switch part is formed at each intersection, and when the desired switch part is pressed, the selected X and Y
A sheet-like keyboard to which a conductor pattern is electrically connected includes a first hard wiring board on which the X-direction conductor pattern is formed, and a thermosetting resin film, and the film is thermally deformed to determine the intersection points. A corresponding circular recess is provided, and a through hole and a circular ring pattern portion surrounding the through hole are provided at the lower part thereof, and a Y direction conductor pattern consisting of a line pattern portion connecting the ring pattern portion in the Y direction. a second wiring board formed on the opening side surface of the recess; a circular dome-shaped dish-shaped spring made of a conductive metal housed in the recess; and a film adhered to the surface of the second wiring board. The second wiring board is fixed on the first wiring board with the opening side surface facing upward and the X-direction conductor pattern is located in the through hole, and the ring pattern portion in the through hole The sheet-like keyboard is formed by the disk-shaped spring housed in the plate being elastically deformed downward by pressure and coming into contact with the X-direction conductor pattern.