JPH0113464Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to an input device.

The purpose of the present invention is to improve the accurate function of input devices such as electronic watches and the time adjustment function derived therefrom.

In recent years, electronic clocks using complementary field-effect transistors have been put into practical use, and various additional devices associated with them have been attracting attention, but input devices are essential when equipped with additional devices and controlling them. The value is extremely high. In particular, the time set mechanism or reset mechanism for time correction is important because it directly affects the accuracy of the timepiece. As an example,
The configuration of a reset mechanism of a conventional electronic timepiece is shown in FIG. In FIG. 1, 1 represents the gate of the reset input and 2 is its output. When a reset input is applied, an H input is applied, and the output side becomes L.
Further, to release the reset, 1 is opened and the output side of 2 is set to H. Figure 2 shows the ideal gate side 1 and output side 2 when using this reset device.
This shows the potential change when a reset is applied. When this reset device is used as an electronic watch, since the reset input device is usually a mechanical type, a chattering phenomenon occurs in the mechanical contacts as shown in Figures 3 and 4 when resetting or releasing the reset, respectively. . Not only reset devices but also conventional input devices of the type shown in FIG. 1 have this common drawback.

In other words, when these input devices are used to control the time of an electronic watch, for example, to adjust the time, the time may fluctuate due to chattering due to an unexpected impact on the mechanical contacts, in addition to chattering during the control intended by the user. movement occurs.

In view of this, the present invention is characterized in that the chattering that occurs at the input terminal when an input is applied, either inevitably or unexpectedly, is removed by a certain predetermined clock delay, and conversely, when the input is released, it immediately returns to the restored state. The purpose of this invention is to provide an input device that can perform the following functions.
The reason why the input return state occurs immediately when the input is canceled is because, for example, if the electronic circuit does not operate at normal time immediately after the time setting is completed, correct time setting will be impaired.

Embodiments of the present invention will be described with reference to the drawings. Figure 9,
11 and 13 are examples of the present invention, and FIGS. 10 and 12 are time charts of FIGS. 9 and 11, respectively. Below, examples and fifth
The input device of the present invention will be explained in detail by comparing it with the comparative example shown in FIGS. FIG. 5 shows an input device using a one-stage set/reset flip-flop 3, which removes chattering at the time of input entering the tb period as shown in the time chart of FIG.
The input is accurately input at the rising edge of the ta period, and the recovery state is immediately restored if 1 is released during the tb period. Set input 4 cl is ta
A slight clock in the period is assumed. If it is inconvenient for the chatter to enter the ta period, this can be achieved by cascading two stages of set/reset flip-flops as shown in FIG. That is, if the period of one chattering cycle is tc<td, the recovery is performed immediately at the rising edge of the input signal in any state as shown in FIG. Furthermore, since the return is performed immediately, no chattering accompanies the return. In that sense, it can be said to be a more complete input device than the method shown in FIG.

By the way, in the method shown in FIG. 5, the method shown in FIG. 9 according to the present invention is even more effective in that it does not necessarily require a minute clock with a period of ta. That is, set
Since the reset flip-flop set timings 3 and 5 are out of phase by 180 degrees, if one period of chattering does not occur in the transition period 6 of cl ₃ , the input will be at cl ₃ as shown in Figure 10. It outputs exactly 2 at the falling edge. Further, recovery is performed immediately under any condition. On the other hand, even in the method shown in FIG. 7, the method shown in FIG. 11 of the present invention is more effective in that it does not necessarily require minute impulse-like clocks of ta and te. In other words, the timing of set/reset/flip/flop is 3 and 5.
and 7 are out of phase by 180 degrees, so even if one period of chattering occurs at the rising or falling edge of cl ₃ , the recovery occurs immediately at the falling edge of the input signal as shown in Figure 12, so at least 2 unless the input signal is longer than half a period of cl ₃ .
Since no output is generated from the signal and the return occurs immediately, no chattering accompanies the return. As described above, since the methods shown in FIGS. 9 and 11 of the present invention do not necessarily require an impulse clock, it is possible, for example, to take the set input from the output of an arbitrary frequency dividing stage that divides the standard signal of an electronic clock as necessary. can.

Furthermore, as an input device according to the present invention that does not require an impulse-like clock, an input device with two or three stages of set/reset/flip-flip has been proposed, but as shown in Fig. 13, input devices with three or more stages or four or more stages may also be used. Of course, it can also be implemented. Figure 13 of the present invention uses Cl ₃ of the same phase as the set input, and sequentially inputs 9 and 10 from the first stage.
Either connect 2m stages and add an inverter to the final stage 11 and 9 to make output 2, or connect 2m + 1 stage sequentially and add an inverter to the final stage.
11 is 10.

By the way, in electronic watches, depending on the local internal state of the watch, it may be desirable to prohibit input from input terminals. For example, in extreme conditions where the battery voltage detection circuit used to display the battery life of an electronic watch is in the detection state, the time display element
If you want to prohibit cases where the current consumption is large, such as when lighting an LED, and the battery voltage becomes low even though it is normally high, indicating that the battery is low, you can reset it at the time of the detection signal and stabilize it with a sufficient detection signal width. This is a case where you want to prevent damage to voltage detection. In the input device of the present invention, the fourteenth
A case where a prohibition gate is provided in at least one arbitrary stage m in FIG. 13 as shown in the figure or FIG. 15 is also included as an embodiment of the present invention. Figures 14 and 15
The figure shows that input is inhibited when I=H.

The input device according to the present invention described above eliminates the drawbacks associated with chattering, and can be applied not only to electronic watches but also as an input device for preventing chattering in response to inevitable or unnecessary inputs of other mechanical types.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a conventional electronic watch reset device. FIG. 2 is a diagram showing potential changes at the input/output section of the reset device in an ideal case. FIG. 3 is a diagram showing potential changes when applying reset when chattering is added. FIG. 4 is a diagram showing potential changes upon release of reset. FIG. 5 and FIG. 7 are diagrams showing comparative examples for explaining the present invention. FIG. 9, FIG. 11, and FIG. 13 are diagrams showing an input device as an embodiment of the present invention. Figure 6 is a time chart of Figure 5. Figure 8 is the time chart of Figure 7. Figure 10 shows the time of Figure 9.
Chart. Figure 12 is the time chart of Figure 11. FIGS. 14 and 15 are diagrams for explaining an input device with a prohibition gate, which is an embodiment of the present invention.

Claims (1)

[Scope of utility model registration request] In an input device comprising a first flip-flop constituted by two two-input NOR gates and a second flip-flop constituted by two two-input NAND gates, a first input terminal of the first flip-flop includes chattering. a second input signal of the first flip-flop;
A periodic clock signal is input to the input terminal of the flip-flop, the output of the first flip-flop is input to the first input terminal of the second flip-flop, and the output of the first flip-flop is input to the second input terminal of the second flip-flop. A clock signal is input, the first flip-flop and the second flip-flop are connected in cascade, and when the input signal is applied, the output of the second flip-flop is inverted in synchronization with the clock signal, and the output of the second flip-flop is inverted in synchronization with the clock signal. An input device characterized in that, when released, the output of the second flip-flop is inverted in synchronization with the release of the input signal, regardless of the clock signal.