JPS5810335A - Device for preventing erroneous operation of touch switch - 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 The present invention provides a touch switch malfunction prevention device, in particular, when a correct touch operation is not performed, the output of the operating touch switch is disabled, and an erroneous operation signal is sent to the device to which the touch switch is connected. The present invention relates to a malfunction prevention device that can prevent supply.

2. Description of the Related Art Touch switches capable of outputting desired control signals through touch operations with a user's finger or the like are well known and have been put into practical use in various devices. These touch switches are suitable as on/off switches for electrical control equipment, and keyboard switches for clocks, calculators, etc.
It has the advantage that a control signal can be reliably obtained with a small amount of operating force, and it has excellent durability. Normally, this type of touch switch has a structure in which adjacent electrodes are covered with an insulator, and both electrodes are electrically connected by the user's finger, but of course, any other switch structure can be used. can be taken.

As mentioned above, the touch switch is suitable as a frequently used switch, and has the advantage that the device can be made smaller by using the touch operation section as the case frame or display surface of the device.

In particular, in watches, etc., by placing a transparent touch switch on the time display surface, the touch switch is hidden in the normal time indication state, but when necessary, its position can be indicated using a liquid crystal display, etc. It can be used as a display and as a time adjustment switch, etc., and its range of use is extremely wide.

However, with conventional touch switches, a control signal is output simply when the user's finger or the like touches the switch, and even if the user does not intend to operate the switch, for example, when carrying the device or accidentally touching the device, the control signal is output. Even in such a case, a control signal is output, and if the control signal is used as a correction switch in a clock or the like, the indicated time may be adjusted unnecessarily, causing erroneous operation.

FIG. 1 shows a conventional device incorporating a touch switch for adjusting the time of a digital display clock e, and a desired time adjustment effect can be obtained by touching a touch switch 12 for adjusting the time provided on the display surface 10. However, as shown in Figure 1, if the user's finger touches the touch switch 12 carelessly while carrying the watch or otherwise, the time indicated by the watch will be incorrectly corrected.

This type of erroneous operation can cause calculation errors not only in watches but also in calculators, etc., and on/off switches, which are often used in many devices, can turn the device on and off against the user's will. This caused problems such as

The present invention has been made in view of the above-mentioned conventional problems, and its purpose is to provide an improved malfunction of a touch switch that reliably prevents erroneous operation contrary to the user's intention and does not output an erroneous control signal. The object of the present invention is to provide a prevention device.

In order to achieve the above object, the present invention arranges a touch switch for detecting an erroneous operation in proximity to a touch switch for operation, and when the touch switch for detecting an erroneous operation is touched when the touch switch for operation is operated. It is characterized by disabling the output of the operating touch switch.

Preferred embodiments of the present invention will be described below based on the drawings.

FIG. 2 shows a first embodiment of the invention, in which a touch switch is provided for correcting a liquid crystal display clock.

The clock's time instruction signal is generated by an oscillation circuit 1 including a crystal oscillator, etc.
After this oscillation signal is divided into a desired frequency by a frequency dividing circuit 16, it is counted by a minute counter 18 and an hour counter 20, and this is converted into a time indication signal by a decoder driver 22. and displayed on the liquid crystal panel 24.

A cover glass 26 is arranged in front of the liquid crystal panel 24, and the time indicated on the liquid crystal panel 24 can be read by looking through the cover glass 26. In this embodiment, this cover glass 26 is provided with a cover glass 26 for adjusting the time. switch is incorporated as a touch switch. That is, an operating touch switch 28 for selecting a correction mode is provided at the center of the right end of the cover glass 26, and an hour correction touch switch 30 and a minute correction touch switch 32 are arranged at the lower end of the cover glass 26. Further, a touch switch 34 for canceling correction is arranged above the right end. Therefore, by touching the operation touch switch 28, the watch enters the time correction mode, and both correction touch switches 30 and 32 become effective, and by touching them any number of times or continuously for any time, the desired value can be set. A corrective effect can be obtained. Then, by touching the correction release touch switch 34, the timepiece returns from the time adjustment state to the normal time indication state.

Each of the touch switches 28, 30, 32 and 34 is made of a transparent electrode in the embodiment, and its position cannot be recognized from the outside, so that the display surface of the liquid crystal panel 24 can have a neat design. can. The liquid crystal panel 24 is provided with switch position indicators 36, 38, 40, and 42 at positions corresponding to the touch switches 28, 30, 32, and 34, respectively, to display the position of each switch as necessary. can do. That is, in FIG. 3, the normal pJI display state is shown, and only the switch position display 36 is shown, thereby making it easy to know the position of the operating touch switch 28 for selecting the correction mode. can. When the operating touch switch 28 is touched and the time adjustment mode is selected, switch position displays 3B, 40, and 42 are displayed on the display screen as shown in FIG. , a month touch switch 30 for hour correction, a touch switch 32 for minute correction, and a touch switch 3 for canceling correction, respectively.
It becomes possible to indicate the position of 4.

A characteristic feature of the present invention is that an erroneous operation detection touch switch 44 is disposed close to the operation touch switch 28. In the embodiment, the erroneous operation detection touch switch 44 is an operation touch switch. 28
With this structure, in order to perform a normal touch operation, it is necessary to touch only the operating touch switch 28 without touching the erroneous operation detection touch switch 44. The touch operation must be performed correctly, and any other case where the erroneous operation detection touch switch 44 is touched is recognized as an erroneous operation, and in the case of such an erroneous operation, the output of the operation touch switch 28 is invalidated.

In order to distinguish between normal operation and erroneous operation based on the signals from both touch switches 28 and 44, an operation discrimination circuit 46 is provided in FIG.
includes a delay circuit 48 for delaying the output of the operating touch switch 28 and a frits-free (hereinafter referred to as FF) 50 controlled by the output of the delay circuit 48;
F50 is reset via the or-dart 52 by the output from the touch switch 44 for detecting erroneous operation.

The output of the operation determination circuit 46 switches the display mode of the clock from normal time indication to time correction, and at this time, the position display of the touch switch is switched. That is, the Q output of the FF50 of the operation determination circuit 46 is supplied to the clock input of the FF54, the Q output of the FF54 opens the UNDATES 56.58, and the outputs from the two correction touch switches 30.32 are ORDATED 60.62. are supplied to the hour counter 20 and minute counter 18, respectively, to enable desired time adjustment, and at this time, the Q output of the FF 54 is used to display the position display 3 of the correction touch switch 30, 32.
8.40 Then, the position display 42 of the touch switch 34 for canceling the correction is set to the display state.

Furthermore, the Q output of the FF 54 is outputted by the inverter 64.
The display of the position display 36 of the operating touch switch 28 is stopped. Note that the output of the touch switch 34 for canceling correction is supplied to the reset inputs of both the FFs 50 and 54 via the FFs 52 and 66.

Furthermore, in this embodiment, a circuit is provided which automatically returns to the normal time indication mode if no correction action is performed for a predetermined period of time after the correction mode has been selected, and this circuit is connected to a 30-decimal counter 68. The IHz count input is supplied through an AND dart 70 which is opened by the Q output of the FF 54, and the Q output thereof is supplied to the reset input of each of the FFs 50.54 through an OACT 52.66. Therefore, when the Q output of the FF 54 becomes rHJ as determined by the normal operation determination by the operation determination circuit 46, the 30-decimal counter 68 continues counting for 30 seconds, and if no corrective operation is performed during this period, both FF
50 and 54 are reset, and the clock returns to its normal time indicating state. The reset input of the 30-decimal counter 68 is supplied with the Q output of the FF 54 and the outputs of the correction touch switches 30 and 32 via the or-dart 72. Each time this occurs, the 30-decimal counter 68 is reset and the correction mode can be maintained.

The first embodiment of the present invention has the above configuration, and the fifth embodiment is as follows.
The effects of each operating state will be explained based on FIGS.

FIG. 5 shows a normal operating state, in which the user must touch only the correction touch switch 28 without touching the erroneous operation detection touch switch 44.

In the case of the operation state shown in FIG. 5, the output of the operation touch switch 28 is delayed by a predetermined time in the delay circuit 48 and is supplied to the clock input of the FF5Q, but at this time there is no output from the erroneous operation detection touch switch 44. Because it is not supplied,
Immediately after the delay time elapses, FF5Q supplies a Q output rHJ to the clock input of FF54, and as a result, FF54
Since the Q output rHJ is obtained, the output of the correction touch switch 30.32 is enabled, the desired time correction effect is possible, and each touch switch 30.32.3
It is possible to display the position 4 and at the same time turn off the display of the operating touch switch 28.

FIG. 6 shows an erroneous operation state in which both the operation touch switch 28 and the erroneous operation detection touch switch 44 are touched at the same time. At this time, the output from the erroneous operation detection touch switch 44 is transmitted through the or dirt 52 to
' 50 is reset, even if the output from the operating touch switch 28 is supplied to the clock input of FF 50, I! ' The Q output of F'56 can maintain rIJ and disable touch operation.

7A and 7B show an erroneous operation state in which the user first touches the erroneous operation detection touch switch 44 and then touches the operating touch switch 28. In this case as well, F F' 50 is reset. Since the state continues, the output of the operation touch switch 28 is invalidated.

First of all, in Figures 8A and 8B, it is the same as in normal times, but
Immediately following this, an erroneous operation state in which the erroneous operation detection touch switch 44 provided around the erroneous operation detection touch switch 44 is operated is shown, and both touch switches 2 at the time of such an erroneous operation are shown.
The operation interval of 8.44 is relatively short, and in this embodiment, the delay time of the delay circuit 48 is set larger than such a normal operation interval. Therefore, even in the case of an erroneous operation as shown in FIG. 8, the output of the erroneous operation detection touch switch 44 resets the FF 50 before the output of the operation touch switch 28 is supplied from the delay circuit 48 to the FF 50, and the respective Operation discrimination circuit 4 as in the case of erroneous operation
No clock input is provided from 6 to FP54.

As described above, according to the first embodiment of the present invention, various erroneous operations can be reliably detected and the output of the operating touch switch can be invalidated.

FIG. 9 shows a second embodiment of the malfunction prevention device according to the present invention, and the same members as those in FIG. 2 are given the same reference numerals and their explanations will be omitted.

In the second embodiment, operating touch switches 74 and 76 are used to adjust the hours and minutes of the digital display clock, and unlike the first embodiment, the clock is in a state where the time can be adjusted at all times, so both touch switches In order to reliably prevent erroneous operation of the touch switches 74 and 76, a partially cut-out ring-shaped touch switch 78 and 80 for detecting erroneous operation is provided around both touch switches 74 and 76. At the position corresponding to the operation touch switch 74, 76, there is a liquid crystal display panel 24.
A switch position display 82, 84 is provided at , and the position of each operating touch switch 74, 76 is displayed at all times. The outputs of the respective touch switches 74 and 76 are supplied to an hour correction operation determination circuit 86 and a minute correction operation determination circuit 88, and only correct operation signals are taken out, and the AND gates 90 and 92 are opened, respectively, during this correction signal output period. In other words, during the period when a normal touch operation is performed, ic 2
A correction signal of H2 can be supplied from each AND gate 90.92 and an orderer 60.62 to each counter 20.18 to effect a desired hour and minute time correction.

The operation determination circuits 86 and 88 have the same configuration.The time adjustment circuit 86 will be explained below with reference to FIG.

The discrimination circuit 86 in FIG. 10 is similar to the discrimination circuit 46 in the first embodiment, and the same members are given the same reference numerals and explanations are omitted. In addition, in the second embodiment, correction operation is always possible. The counter that maintains the correction state is composed of a ternary counter 68a, which returns to the normal time indicating state when the correction operation is stopped for 3 seconds.

A characteristic feature of this embodiment is that the output from the touch switch 78 (80) for detecting an erroneous operation is transmitted through the FF94.
F50 and the reset input of the counter 68a, and this FF94 is reset by the delay signal of the erroneous operation detection signal, and therefore the delay circuit 9
6 is provided.

That is, according to the combination of the FF 94 and the delay circuit 96, even if the erroneous operation detection signal is once output and the FF 94 outputs the Q signal rHJ, when the erroneous operation detection signal disappears, the FF' is output after a predetermined delay time. 94 Q
The output returns to "L" and normal signal output can be performed. Normally, the delay time of the delay circuit 96 is set longer than the delay time of the delay circuit 48 for processing the output of the operating touch switch.

As described above, according to the second embodiment, the output of the touch switches is enabled when only the operating touch switches 74 and 76 are operated, and the touch switch for error detection +11 is enabled, as in the first embodiment described above. When operating the switch 78 or 80, the touch switch output can be invalidated as an erroneous operation.

Further, according to the second embodiment, the erroneous operation detection signal is transmitted to the FF94.
and the delay circuit 96, for example, the 11th A
As shown in the figure, when the erroneous operation detection touch switch 78 is touched by mistake for the first time, the 11'
17' 94, it is possible to achieve a reliable malfunction prevention effect by disabling the output of the operating touch switch 74, and furthermore, after touching this erroneous operation detecting touch switch 78, the correct operating touch switch is activated as shown in FIG. 11B. If only an operation is performed, this output can be made valid after a delay time of +1 iJ'r has elapsed.

FIG. 12 shows a third embodiment of the present invention, which is an improvement on the second embodiment shown in FIG. 9, in which touch switches 78 and 80 for detecting erroneous operation are electrically connected in common. Except for this, the other configurations and operations are completely the same as in the second embodiment.

Further, FIG. 13 shows a fourth embodiment in which the malfunction prevention device according to the present invention is applied to an on/off switch of a calculator or the like.

An input signal obtained from the keyboard 98 of the calculator is subjected to a desired calculation by an arithmetic circuit 100 and then displayed on a display section 102. In order to operate each of the circuits, a power source 104 such as a battery is provided, and a key is placed on the keypad 98.
An operation touch switch 106 is provided for turning on, and its output is determined by an operation discrimination circuit 108 as either normal operation or abnormal operation, and during normal operation, the power supply voltage is transmitted from the power supply 104 to each part by the discrimination circuit 108. supplied through the In order to determine the operation state of the Afj touch switch 106, an erroneous operation detection touch switch 110 is arranged around the touch switch 106, thereby preventing the power from being turned on unnecessarily in the event of an erroneous operation. . The determination circuit 108 is supplied with the output of the touch switch 112 of the key yl+"- key 98,
It is possible to forcibly turn off the power as in the conventional case.

Note that the power supply voltage is constantly supplied from the power supply 104 to the oscillation circuit 114, and the output of the oscillation circuit 114 is supplied to the arithmetic circuit 100.

FIG. 14 shows the internal configuration of the operation determination circuit 108,
As in each of the embodiments described above, when only the operation touch switch 106 is touched, the output of the delay circuit 4B, FF 50, and ORDART 52 can be made valid, and this output causes the MOS) run source 116 to be activated. When turned on, voltage is supplied from the power supply 104 to each part.

As explained above, according to the present invention, even if a touch switch is accidentally touched while carrying the device,
By reliably detecting such erroneous operations and disabling the output of the touch switch, it is possible to reliably prevent equipment malfunctions.

[Brief explanation of drawings]

FIG. 1 is an external perspective view of a timepiece incorporating a conventional operating touch switch; FIG. 2 is an explanatory diagram showing a first embodiment in which a malfunction prevention device according to the present invention is incorporated into a digital optical indicator timepiece; Figure 4 is an explanatory diagram showing the time indication mode and time adjustment mode of the first embodiment, Figures 5.6.7A, 7B, 8A, and 8B are explanatory diagrams of the operation of the first embodiment, respectively. An explanatory diagram showing the second embodiment of the invention, FIG. 10 is a discrimination circuit diagram of FIG. 9, FIGS. 11A and IIB are action explanatory diagrams of the second embodiment,
The figure is an explanatory diagram showing a third embodiment of the present invention which is similar to the second embodiment. Figure 13 is an explanatory diagram of main parts showing a fourth embodiment of the present invention in which a malfunction prevention device according to the present invention is incorporated into a calculator. , FIG. 14 is a circuit diagram showing the operation determination circuit of the fourth embodiment. 28... Touch switch for operation, 44... Touch switch for detecting erroneous operation, 46... Operation discrimination circuit, 48... Delay circuit, 50... Flip float switch, 74.76... For operation Touch switch, 78.80・
...Touch switch for detecting erroneous operation, 86... Hour correction operation discrimination circuit, 88... Minute correction operation discrimination circuit, 106... Operation touch switch, 108... Operation discrimination circuit, 110... Erroneous operation Touch switch for detection. Figure 1 Figure 6 Figure 7A Figure 78 Figure 11A Figure 12

Claims (1)

[Claims] (1) A touch switch for detecting erroneous operation is arranged in close proximity to the touch switch for operation, and when the touch switch for detecting erroneous operation is touched while operating the touch switch for operation, the output of the touch switch for operation is disabled. A touch switch malfunction prevention device characterized by: