JPS6261215A - Key input unit - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a key input device using a pressure-sensitive anisotropic conductive member.

(Summary of the Disclosure) A pair of contacts on a printed circuit board is divided into two parts corresponding to the pair of contacts via a pressure-sensitive anisotropic conductive member, and bridging connections are made by bridging contacts connected by a detour pattern.

(Prior Art) Conventionally, in this type of key input device, the contact pattern in one button area located on both sides of the pressure-sensitive anisotropic conductive sheet has two contact patterns on the first surface as shown in FIG. one contact pattern b,
c, 1 on the second side in the form of straddling the two patterns of t51
Two bridging contact patterns f are formed.

(Problems to be Solved by the Invention) In such an input device, it is conceivable to arrange another pattern between the pair of contact patterns b and c, for example, in order to complicate the pattern of the printed circuit board. If it is arranged like this, this pattern will come into contact with the bridging contact pattern, which is inconvenient.

(Means for solving the problem) A structure is adopted in which a bridging contact for bridging a pair of contacts is divided into two parts corresponding to the pair of contacts, and these are connected by a detour pattern.

(Function) When the bridge A8 contact, which is divided into two parts and connected by a detour pattern, is pressed, the anisotropic conductive member in the pressed part conducts, electrically connecting the bridge contact and the corresponding pair of contacts. At this time, the bridging contacts are connected by a detour pattern, so the pair of contacts are bridgingly connected. Furthermore, even if another pattern exists between a pair of contacts, the other pattern will not be connected to the bridging contact because the bridging contact side does not have a portion that faces this other pattern.

(Example) FIG. 1 shows an embodiment of the present invention. Here a.

e is a patterned surface of the flexible printed circuit board, b and c are a pair of fixed contacts, and g and h are fixed contacts.

Bridging movable contacts corresponding to C, i are contacts g and h
A detour pattern that makes conductive, k is a contact point.

This is a pattern of a different system from the switch circuit that passes between C and C. j is the range of area that can be pressed at once. Note that a pressure-sensitive anisotropic conductive structure exists between pattern surfaces a and e. Further, FIG. 2 shows a sectional view of the contact portion of the embodiment shown in FIG. 1. Now, when the 5th part of the push button part is pressed, the contact gf! l:B, 11 and C are electrically connected, and contacts g and h are electrically electrically connected by the detour pattern i, so contacts S and C are bridge-connected and further contact.

The terminals d connected to C respectively become conductive. Furthermore, a pattern k of a different system from the push-button key switch circuit can exist between c and c that are in contact at the same time.

FIG. 3 shows another embodiment of the present invention, in which the conventional example shown in FIG. 4 is laminated in the thickness direction of the embodiment shown in FIG. A pair of rigid T-contact sentences.

b and pattern are formed on the front surface of a flexible printed circuit board m, and furthermore, on the back surface of this printed circuit board m, a bridging 11T moving contact n for configuring a second switch is formed. A second anisotropic conductive film 0 is attached to the lower surface side of the printed circuit board m, and further below this anisotropic conductive film,
A printed circuit board P having a pair of fixed contacts is arranged.

According to the above embodiment, two independent circuit switches can be closed with one operation.

Furthermore, in the independent detour patterns in this embodiment, a plurality of detour patterns may be arranged by changing the shape, number of divisions, and area of the contact points.

(Effects) As explained above, according to the present invention, in a key input device using a pressure-sensitive anisotropic conductive member, a pattern of a different system can be arranged between a pair of fixed contacts, and the pattern can be improved. At the same time, it becomes possible to design even higher-density patterns.

[Brief explanation of the drawing]

FIG. 1 is a detailed explanatory diagram of the present invention, FIG. 2 is a sectional view of FIG. 1, FIG. 3 is a sectional diagram of another embodiment, and FIG. 4 is an explanatory diagram of a conventional example. a, e---printed pattern face, c----one fixed contact g+h-m-bridging movable contact d
---m 7- Pattern k--Pattern i of another system---Detour pattern j--Area pattern that can be pressed by one operation---Pressure-sensitive anisotropic conductive film

Claims (2)

[Claims] (1) In a key input device that performs key input by short-circuiting a pair of contacts on a printed circuit board by a bridging contact with a sexually anisotropic conductive member interposed, the bridging contact corresponds to the pair of contacts. A key input device characterized by having a structure in which the key input device is divided into two parts and connected by a pattern that bypasses the bridging contact point of the two parts. (2) The key input device according to claim 1, wherein a pattern is arranged between the pair of contacts of the printed circuit board.