JPH0447617A - Key input device - Google Patents

Abstract

PURPOSE:To prevent error pusshing of a key switch or simultaneous pushing of neighboring switches by a method wherein respective resistors and key switches are unitized respectively, the respective units are made free separable by unit, the units are made able to be arranged in an optionable order to the key input device and the resistors inside the respective units are in series connected at the time of arrangement. CONSTITUTION:A key unit 20A is provided with a key switch 22A with and a resistor 24A in parallel further being provided with the terminals 26A, 28A connected thereto. The key unit 20B to 20F are similarly constituted to the key unit 20A while the resistors 24A to 24F are set at different resistance values respectively. A recessed part (key switch housing part) 32A is formed on the key input device main body 32 so as to enable the key unit 20A to 20F to be arranged in optional positions also to enable resistors inside the respective units to be in series connected. Accordingly, since the key switches can be changed to a convenient arrangement for a user, an error pushing and simultaneous pushing of neighboring other key switches can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a key input device, and particularly to a key input device in which key switches for operation are arranged, such as a punch phone or a remote control device.

[Conventional technology]

Conventional remote control devices include resistors 1 with different resistance values corresponding to key inputs IOA to 10F, as shown in FIG.
There is one in which 2A to 12F are arranged in series. Therefore, for example, the key switch IO of this remote control device 14
When A is pressed, current flows around the resistor 12A and the voltage drops by an amount corresponding to the resistor 12A, so that the determination circuit 16 determines that the pressed key switch is IOA.

The arrangement of the key switches of the remote control device 14 configured in this manner is preset, and the arrangement cannot be arbitrarily changed by the user.

[Problem to be solved by the invention]

However, since the usage status of the remote control device 14 differs from user to user, frequently used key switches are not necessarily arranged in positions that are easy for users to press.

Therefore, if a frequently used key switch is located in a position that is difficult to press, problems may occur such as pressing the key switch incorrectly or pressing other adjacent key switches at the same time.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a key input device that can prevent pressing the wrong key switch or pressing other adjacent key switches at the same time.

[Means to solve problems]

In order to achieve the above object, the present invention includes a plurality of resistors each having a different resistance value and connected in series, a plurality of key switches connected in parallel to each resistor, and a key switch that is pressed. In a key input device having a circuit for determining which key switch has been pressed based on a voltage change when the key switch is pressed, each resistor and key switch are each made into a unit so that each unit can be freely separated, and the unit is connected to the key input device. They are characterized in that they can be arranged in any order, and that the resistors in each unit are connected in series when arranged.

[Effect]

According to the present invention, since the key switch of the key input device and the resistor corresponding to the key switch are formed into a unit, the arrangement of the individual units can be changed arbitrarily. Therefore,
For example, since frequently used key switches and less frequently used key switches can be arranged separately, the key switches can be arranged in a manner that is convenient for the user.

〔Example〕

Preferred embodiments of the key input device according to the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1A shows a key unit 20 used in a key input device related to the present invention.

The key unit 2OA has a key switch 22A and a resistor 24.
A are provided in parallel, and terminals 26A and 28A connected to these are further provided.

FIG. 1 (8) shows the key unit 20A in the key input device 30.
This shows a state in which 20F to 20F are arranged.

Here, key units) 20B to 20F are key units) 2
It is configured similarly to OA. However, key unit) 2O
The resistors 24Δ to 24F of A to 20F are set to different resistance values, respectively. Therefore, assuming that the resistance values of the resistors 24A to 24F are R1 to R6, when the key switches 22A to 22F of the key input device 30 are not pressed, VO-10(R1+R2+R3+R4+R5+R6)(
A voltage vO of IO=current) is applied. For example, when the key switch 22A is pressed, V1=I l (R2+R3+R4+R5+R6)(
(1) A voltage V1 (current) is applied. Therefore, since the voltage changes from VO to vl, the determination circuit 31 determines that the key switch 22A has been pressed. Similarly, key switch 22B
The pressed key switch among 22F to 22F can be determined.

FIGS. 2A and 2B show a first embodiment of the key input device. A recess R (key switch housing portion) 32A is formed in the key input device main body 32, and the key units 7) 2OA to 20F can be placed at arbitrary positions within the recess 32A. Therefore, the key units 7) 2OA to 20F can be arranged at desired positions. After that, cover with the lid 34 and fix the key units 7) 2OA to 20F (second
Figure (B)). In this way, each key unit is attached to the lid 34.
Since it is fixed independently, it is possible to remove keyswitches that are not in use.

FIG. 3 is a perspective view of a key unit 40A used in a second embodiment of the key input device according to the present invention. Figure 3 (A
), there are recesses 44 on two sides of the key unit 40A.
A is formed, and convex portions 46A, 46A are formed on the other two sides as shown in FIG. 3(B). The convex portion 46A is fitted into the concave portion 44A and is formed to slide within the concave portion 44Δ. 3(A) and 3(B), 42A is a key switch, and the key unit 40A is constructed in the same manner as the key unit 2OA in FIG. 1(A).

Therefore, when the convex portion and the concave portion of each of the key units 40A to IOE are engaged, the key units 40A to 40E are assembled as shown in FIG. 4(A). On the other hand, since the convex portion and the concave portion of these key units slide, the key units 40Δ to 40E can slide within the concave portion 52 of the key input device main body 50 as shown in FIG. 4(B).

Therefore, the arrangement of the key units 4OA to 40E can be changed arbitrarily.

Further, as shown in FIG. 4(B), after arranging the key units 42A to 42E at desired positions, a dummy key 54 is placed in the space of the recess 52 of the key input device main body 50 to fix the key units 4OA to 40E. do. Incidentally, the dummy key 54 is connected to the terminal 5 having no resistance as shown in FIG. 4(C).
4A and 54B, the circuits of key units 40A to 40E can be connected.

〔Effect of the invention〕

As described above, according to the key input device according to the present invention, the user can easily use the key switch.
・Key input device body.

Since the arrangement can be changed to a different arrangement, it is possible to prevent pressing the wrong key switch or pressing other adjacent key switches at the same time.

[Brief explanation of drawings]

FIG. 1(A) shows a key unit y of a key input device according to the present invention.
), FIG. 1(B) is a schematic diagram showing its arrangement state, FIGS. 2(A) and (B) are overall perspective views showing one embodiment of the key input device according to the present invention, Figure 3 (A), (B
) is a perspective view showing a key unit used in another embodiment of the key input device according to the present invention, and FIG.
A>, FIG. 4(B) is a plan view showing a state in which the key units shown in FIG. 4(B) are combined, FIG. (B) is a schematic diagram of a dummy switch used in another embodiment, and FIG. 5 is a schematic diagram showing the relationship between a key switch and a resistor of a conventional remote control device.

Claims (1)

[Scope of Claims] A plurality of resistors each having a different resistance value and connected in series, a plurality of key switches connected in parallel to each resistor, and a voltage change when the key switch is pressed. In a key input device having a circuit for determining which key switch is pressed by a key input device, each resistor and key switch are formed into units, each unit is freely separable, and the units are arranged in an arbitrary order with respect to the key input device. A key input device characterized in that the key input device is configured so that the resistors in each unit are connected in series when arranged.