JPH04123737A - Non-touch switch device - Google Patents

Abstract

PURPOSE:To prevent erroneous input by determining order of precedence in a predetermined direction to simultaneous input, and by judging that a non-touch switch of higher precedence is turned ON. CONSTITUTION:When a line is provided vertically from a non-touch switch 1, an order of precedence is determined from the upper part to the lower. Also, when the switch 1 is arranged in a matrix, an order of precedence is determined from the upper part to the lower, while an order of precedence is determined from the line on the far left hand side to the line on the right hand side. Even when a simultaneous input with a lower non-touch switch 1 occurs, control and judgement are carried out by a calculation control circuit 10, and an intended non-touch switch 1 of higher precedence is detected thereby, and an erroneous actuation to a normal finger tip approaching is thus eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a non-touch switch device that uses a flat capacitor and detects a change in capacitance of the flat capacitor.

[Prior Art] The basic patent for this type of non-touch switch is owned by InchLeft Electronics Limited of Australia. Patent number 41 PC knife/A11
It is 86100043.

Next, the configuration and basic operation of this non-touch switch will be explained. As shown in FIG. 4, it is formed of a flat plate capacitor consisting of an outer electrode plate 2 and a central electrode plate 4 disposed inside the outer electrode plate 2 with an insulator 3 interposed therebetween, indicated by diagonal lines. There is. As shown in No. 52, a square wave is inputted as a drive signal to the outer electrode plate 2, and a detection transistor Q1 is connected to the center electrode plate 4.

FIG. 7(a) shows the charge distribution state of the flat plate capacitor, and the 71st! (b) shows the state of charge distribution when the fingertip is brought close to the fingertip. That is, non-touch switch 1
When the fingertip approaches the switch surface of will be formed. For this reason, the electric charge between the electrodes is divided, and the capacitance between the electrode plates 2 and 4 is reduced compared to the normal state.
In the output waveform shown in a), the current flowing through one transistor Q1 decreases and the output pulse changes, as shown in FIG. 2B. Detects this change and turns on non-touch switch 1.
Determine off. Such n non-touch switches 1 are arranged in a &: matrix as shown in 812I.

On the other hand, to determine whether the non-touch switch 1 is on or off, σ is determined by storing a reference value derived from the peak value of the detected pulse when the power is turned on, and performing successive comparisons with the detected pulse signal σ peak value. hold level), the non-touch switch l is determined to be on.

The detection pulses are taken out at regular intervals, and comparison test 1 is repeated.

[Problems to be Solved by the Invention] However, since a large number of non-touch switches 1 are arranged adjacent to each other, the output pulses of the non-touch switches 1 around the non-touch switches 1 change as the fingertip approaches. In particular, when a non-touch switch is installed vertically, the non-touch switch below the non-touch switch intended by the person will be detected first. If a non-touch switch is installed horizontally, there is a problem in that the non-touch switch that is closer to the user's intended non-touch switch will be detected first.

The present invention has been provided in view of the above-mentioned points, and provides a non-touch switch device whose purpose is to set priorities for simultaneous inputs and prevent erroneous inputs.

[1! Means for Solving the Problem] The present invention provides a control determination means that prioritizes simultaneous inputs in a predetermined direction and determines that a non-touch switch with a higher priority has been turned on.

[Operation] The control determining means sets priorities in a predetermined direction for simultaneous inputs, and determines that a non-touch switch with a higher priority has been turned on.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings. Third
The figure shows a block diagram showing the signal system of the non-touch switch 1. Although only one non-touch switch 1 is shown, it is actually formed in a matrix.

A square wave key scan drive signal is scanned and inputted to each non-touch switch 1 from the arithmetic control circuit 10 consisting of a microcomputer as described above. The output of the non-touch switch 1 is detected by a transistor Q, and the DC component of the output of this transistor Q is removed by a DC component removal circuit 11. Then, the output signal amplified by the amplifier circuit 12 is peak-held by the peak hold circuit 13, compared with a reference value from the arithmetic control circuit 10 by the Sarani 5 comparator 14, and the output is inputted to the arithmetic control circuit 10. Further, the light emitting diode 7 is controlled by an on/off control signal in response to the output of the comparator 14 by the arithmetic control circuit 10, and furthermore, the light emitting diode 7 is dynamically illuminated by an LED scan signal.

In addition, when clarifying the on/off layer of the non-touch switch 1, 5th 41st! As shown in FIG. 1, a hole 6 is provided in the center of the center plate 4 and the substrate of the non-touch switch 1, and the light emitting diode 7 is placed within this hole 6.

Here, when the non-touch switches 1 are arranged in a row in the vertical direction as shown in FIG. If the buttons are pressed at almost the same time, there is a possibility that the keys will receive incorrect input and malfunction.

Therefore, in the present invention, as shown in FIG. 1(b), when five non-touch switches 1 are arranged in a row in the vertical direction, the non-touch switches 1 in FIG. The number indicates the priority.

Further, FIG. 1(e) shows a case where the non-touch switches 1 are arranged in a matrix, and in this case as well, the priorities are assigned from top to bottom, and the priorities are assigned in order from the leftmost column to the rightmost column. It is set up. 1st rI! The numbers 1(b) and (e) indicate the priority order. Therefore, even if a simultaneous input with the lower non-touch switch 1 occurs, the control judgment is made by the arithmetic control circuit 10, and the intended non-touch switch 1 with a higher priority is detected, preventing malfunctions due to normal fingertip approach. It is something that will disappear. Note that the arithmetic control circuit 10 constitutes a control determination means.

FIG. 2 shows another embodiment. When the non-touch switch 1 is installed horizontally, considering the structure of the human finger, the non-touch switch 1 on the front side of the intended non-touch switch 1 must be input at almost the same time, as shown in Figure 2 (a). This may result in malfunction. Therefore, as shown in FIG. 2(b), priority is given from far to near (in the illustrated example, from left to right). The same figure (e
) is a case where the non-touch switches 1 are arranged in a matrix, and in this case, the priority is assigned from the top row to the bottom row. Note that the numbers in (b) and (e) in the same figure indicate the priority order. Therefore, the non-touch switch in front
Even if simultaneous inputs occur, the arithmetic control circuit 10 makes a control decision and detects the intended non-touch switch 1 with a higher priority, eliminating normal malfunctions caused by the approach of the fingertip.

[Effects of the Invention] The present invention is provided with a control judgment means that sets priorities in a predetermined direction for simultaneous inputs and judges that a non-touch switch with a high priority is turned on. By setting priorities in a predetermined direction for simultaneous inputs, it can be determined that a non-touch switch with a higher priority has been turned on, and there is an effect that malfunctions due to normal fingertip approaches are eliminated.

In claim 2, when non-touch switches are arranged in a row in a vertical direction, priority is set from top to bottom, and when non-touch switches are arranged in a row in a horizontal direction, priority is set from far to near. By providing this, it is possible to determine that a high-priority non-touch switch has been turned on based on the priority set from top to bottom or from farthest to nearer for simultaneous inputs, and it can be determined that a non-touch switch with a higher priority has been turned on. This eliminates all malfunctions.

[Brief explanation of drawings]

1st rj! I(a) to (e) are detailed explanatory diagrams of the present invention,
FIGS. 2(a) to (c) are explanatory diagrams of other embodiments of the same as above, FIG. 3 is an overall block diagram of the same as above, and FIG. 4 is a plan view of a non-touch switch. Figure 5 is the same circuit diagram as above, Figure 6 (a
)(b) shows the output waveforms of the above, respectively, and FIG. 7(a)
(b) is an explanatory view of the same as above, and FIG. 8 is a plan view showing a state in which the non-touch switches of the above are arranged in a matrix. 1 is a non-touch switch. Agent Patent Attorney Ishi 1) Chief Figure 714 Figure 5 @ Figure 6 (a) (b) (0) Figure (b) (C) Written amendment to Figure 2 procedure (voluntary) November 24, 1990

Claims (2)

[Claims] (1) In a non-touch switch device in which a large number of non-touch switches that detect changes in the capacitance of a flat plate capacitor are installed adjacent to each other, priority is set in a predetermined direction for simultaneous input, and the non-touch switch with the highest priority is set. 1. A non-touch switch device characterized by comprising a control determination means for determining that the switch is turned on. (2) When non-touch switches are arranged in a row in a vertical direction, priority is set from top to bottom, and when non-touch switches are arranged in a row in a horizontal direction, priority is set from far to near. The non-touch switch device according to claim 1.