JPH0543250U - Key input device - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a key input device capable of reducing the space of a keyboard portion and downsizing the entire device. [Composition] When the cover member 1a is closed, the contact of the detection switch 6 is turned off, the LSI 7 does not output the keyboard switching signal S, the gate G1 is open, and the gate G2 is closed. In this state, the first keyboard 4 can be operated, but the key operation on the second keyboard 5 is invalid. Further, when the cover member 1a is opened, the contact of the detection switch 6 is turned on, and the LSI 7 causes the keyboard switching signal S
, The gate G1 is closed and the gate G2 is opened. In this state, the second keyboard 5 can be operated,
The key operation on the first keyboard 4 becomes invalid.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This invention relates to a key input device.

[0002]

[Prior Art]

 An electronic notebook that can store schedules, telephone numbers, etc. is equipped with a large number of keys for entering alphabetic characters and Kana characters.

[0003]

[Problems to be solved by the device]

 Therefore, the space for the keyboard in which the above-mentioned many keys are arranged is large, and the entire device becomes large, which is inconvenient to carry. The present invention has been made to solve the above problems, and an object of the present invention is to provide a key input device capable of reducing the space of the keyboard portion and downsizing the entire device.

[0004]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the present invention has a cover member that is openable and closable with respect to the main body, a first key input means that allows the cover member to be operated in a folded state, and the cover member is opened. It is characterized by comprising a second key input means that can be operated in a state and a switch means that switches one of the first and second key input means so that either one can be operated.

[0005]

[Action]

 The operation of this device is as follows. The first key input means is used with the cover member closed, and when the cover member is opened, at the same time, the switch means for switching between the first key input means and the second key input means is actuated to activate the second key input means. The key input means of can be operated.

[0006]

【Example】

 An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a front view showing the external configuration of a small electronic computer to which the present invention is applied. As shown in the figure, a display section 2 and a switch section 3 are provided on the upper half of the main body 1. Further, a cover member 1a is provided on the lower half of the main body 1 so as to be openable and closable by a hinge portion 1b described later. A first keyboard 4 is provided on the front surface side of the cover member 1a. The first keyboard 4 has ten keys "0" to "9", four arithmetic operation keys "+" to "÷", and memory operation keys "MC" to "M +".

FIG. 2 is a front view showing a state in which the cover member 1a is opened. As shown in the figure, when the cover member 1a is opened, a second keyboard 5 is provided on the lower half of the main body 1 and on the back surface side of the cover member 1a. That is, the first keyboard 4 is provided on the front surface side of the cover member 1a, and the second keyboard 5 is provided on the rear surface side. Further, the main body 1 is provided with a detection switch 6 for detecting opening / closing of the cover member 1a.

FIG. 3 is a sectional view taken along line XX in FIG. As shown in the figure, the cover member 1a is provided so as to be openable and closable with respect to the main body 1 by a hinge portion 1b. The detection switch 6 is configured such that when the cover member 1a is opened, the rod 6a projects above the main body 1 to turn on the contact, and when the cover member 1a is closed, the rod 6a is pushed by the cover member 1a to turn off the contact. There is.

FIG. 4 is a block diagram showing a circuit configuration of a small electronic computer. The detection switch 6 is turned on when the cover member 1a is opened to supply the voltage VDD to the LSI 7. The LSI 7 outputs a key output signal KO to the first keyboard 4 and the second keyboard 5 to perform key sampling. When a key operation is performed, the key input signal KI1 output from the first keyboard 4 is input to the LSI 7 via the gate G1, and the key input signal KI2 output from the second keyboard 5 is input to the gate G2. Is input to the LSI 7 via. The keyboard switching signal S is output from the LSI 7 to the gate G2, and the keyboard switching signal S is output to the gate G1 via the inverter 8. The keyboard switching signal S is a signal output from the LSI 7 when the detection switch 6 is in the ON state. Further, the LSI 7 outputs a display drive signal to the display unit 2.

Next, the operation of the above embodiment will be described. As shown in FIG. 1, when the cover member 1a is closed, the rod 6a of the detection switch 6 is pushed by the cover member 1a and the contact is turned off. Therefore, the voltage VDD is not supplied from the detection switch 6 to the LSI 7, and the LSI 7 does not output the keyboard switching signal S but outputs the "0" level. Therefore, the gate G1 is supplied with the inverted "1" level by the inverter 8 to open the gate, and the gate G2 is supplied with the "0" level to close the gate. In this state, the key input signal KI1 output from the first keyboard 4 is taken into the LSI 7 via the gate G1, so that the first keyboard 4 can be operated. However, the key input signal KI2 output from the second keyboard 5 is not input to LSI7 because the gate G2 is closed, and the key operation on the second keyboard 5 becomes invalid.

Further, as shown in FIG. 2, when the cover member 1a is opened, the rod 6a of the detection switch 6 projects above the main body 1 to turn on the contact. Therefore, the voltage VDD is supplied from the detection switch 6 to the LSI 7, and the LSI 7 outputs the "1" level keyboard switching signal S. Therefore, the gate G1 is supplied with the "0" level inverted by the inverter 8 to close the gate, and the gate G2 is supplied with the "1" level keyboard switching signal S to open the gate. In this state, the key input signal KI2 output from the second keyboard 5 is taken into the LSI 7 via the gate G2, so that the second keyboard 5 can be operated. However, the key input signal KI1 output from the first keyboard 4 is not input to the LSI 7 because the gate G1 is closed, and the key operation on the first keyboard 4 becomes invalid. That is, even if the first keyboard 4 is erroneously operated in the state shown in FIG. 2, the key operation becomes invalid, so there is no problem.

[0012]

[Effect of the device]

 According to this invention, it is possible to provide a key input device in which the space of the keyboard portion is reduced and the entire device can be downsized.

[Brief description of drawings]

FIG. 1 is a front view showing the appearance of a small electronic calculator.

FIG. 2 is a front view showing an appearance of a small electronic calculator.

FIG. 3 is a sectional view taken along line XX in FIG.

FIG. 4 is a block diagram showing a circuit configuration of a small electronic calculator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Main body 2 ... Display part 3 ... Switch part 4 ... 1st keyboard 5 ... 2nd keyboard 6 ... Detection switch 7 ... LSI

Claims (2)

[Scope of utility model registration request] 1. A cover member that is provided so as to be openable and closable with respect to a main body, a first key input means that allows the cover member to be operated in a folded state, and a first key input means that allows the cover member to be operated in an open state. A key input device comprising: two key input means; and a switch means for switching one of the first and second key input means so that either one can be operated. 2. The key input device according to claim 1, wherein the first key input means and a part of the second key input means are back to back.