JPS594316Y2 - Electronic clock input switching circuit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a circuit for preventing malfunctions caused by sleeve operation time setting operations in electronic watches.

In recent years, the integration of electronic circuits has progressed, and at the same time, with the development of numeric display devices using light emitting diodes and liquid crystals, electronic clocks that operate in synchronization with a crystal oscillator or commercial power supply and display the time on a digital display have become popular. It has become widely used, and devices with functions such as a sleeve and an alarm in addition to a time display are now available.

However, in many of these electronic watches, the electronic circuits perform operations on a time-sharing basis to perform multiple functions.

Therefore, when operating an appropriate input device such as a push button switch to set the sleeve operating time, the operating mode of the electronic circuit may not immediately switch to the mode for setting the sleeve time, and the operating mode remains in that state. If you set it, there is a risk that the time display will be messed up.

This will be explained regarding the conventional electronic timepiece shown in FIG.

In this figure, 1 is a clock integrated circuit, 2 is a numeric display device, and 3 is a switch for setting sleeve time.

This switch 3 consists of a movable contact a and spring contacts S and C that close sequentially when contact a is pressed.

4 is a capacitor, and 5 is a resistor. In this electronic watch, when switch 3 is pressed when necessary, contacts a and b are closed, and voltage VDD is applied to the sleeve switching input of integrated circuit 1.
is applied to switch the operating mode of the circuit 1, and when the time is displayed on the numeric display device 2, only minutes are displayed, indicating that the sleeve has been switched.

Therefore, when switch 3 is pressed further, contact C is closed in addition to contacts a and b, and all contacts a, b, and c are connected to the voltage VDD.
, and the voltage ■ is also applied to the time set input of integrated circuit 1.

D is applied to set the time.

Therefore, when switch 3 is released when the predetermined time is displayed, contact C is first opened, the application of voltage VDD to the time set input is removed, the time set operation is stopped, and then contact A is removed from contact A. However, at this time, the charge stored in the capacitor 4 is applied to the sleeve switching input via the resistor 5, and the capacitor 4 and the resistor 5
Since the voltage is removed from the sleeve switching input after a delay of a time constant determined by , after the delay time determined by this time constant, the integrated circuit 1 returns from the sleeve set mode to the time display mode, and the numeric display device 2 again displays the time. .

However, as mentioned above, since the timepiece integrated circuit 1 operates in a time division mode, even if the switch 3 is pressed to close the contacts a and b, it may not immediately switch to the sleeve state.

The switching time delay at this time is 1 of the time division operation.
Although it is determined by the cycle time and is quite short, if switch 3 is pressed quickly, contact a will make contact immediately.
In such a case, the voltage VDD is applied to the time cell 1 input before the circuit 1 is switched to the sleeve set state, and the time display changes due to the time set input until the circuit 1 is switched to the sleeve set state. Sometimes things can change.

Conventionally, in order to prevent this, the switch 3 was connected to the movable contact a.
and spring contacts S and C, so that when switch 3 is pressed, these contacts A, B, and C close sequentially with a delay,
Although the integrated circuit 1 is sufficiently switched during the delay time, as mentioned above, this is insufficient.

An object of the present invention is to provide an input switching circuit for an electronic timepiece that eliminates the drawbacks of the prior art described above and allows the sleeve time to be set correctly regardless of whether the sleeve time setting switch is operated or not.

To achieve this objective, the present invention is characterized in that it utilizes the display change of the numeric display device when the operation of the electronic circuit is switched to the sleeve setting state.

Hereinafter, one embodiment of the present invention will be described in detail with reference to FIGS. 2 and 3.

In these figures, a watch integrated circuit 1, a numeric display device 2
, switch 3, capacitor 4, and resistor 5 are the same as in the conventional example shown in FIG. 1, but the numeric display device 2 is composed of segment display elements.

Also, 6 is a capacitor, 7 to 9 are diodes, and 10 to 9 are diodes.
14 is a resistor, and 15j6 is an NPNl transistor.

Next, its operation will be explained.

When switch 3 is not pressed, resistance 10.11
．． The voltage VSS is supplied to the base of the transistor 15 via the diode 7 and the resistor 12, and the transistor 15 is in a conductive state, so that its collector potential is equal to the voltage VD.
Since it is approximately equal to D, the transistor 16 is cut off and no voltage VDD is applied to the time set input of the integrated circuit 1 and, of course, no voltage is applied to the sleeve switching force.

Further, at this time, the numeric display device 2 is displaying the time, and since the voltage Vss is supplied to either segment 1 or 2 of the element that displays the time of the first digit, the transistor 15 is The base is supplied with base current from the conductors to these segments 1, 2 via diodes 8, 9 and resistor 13.12, so that transistor 15
is also maintained in a conductive state by this current.

Here, when switch 3 is pressed to set the sleeve time, contacts a and b close, voltage VDo is applied to the sleeve switching input of integrated circuit 1, and switching is performed.

Following this, contact C closes and voltage VDD is applied to the connection point of resistors 10 and 11, so that resistors 10, 11 . The current supplied to the base of the transistor 15 via the diode 7 and the resistor 12 disappears, but until the operation of the circuit 1 is switched to the sleeve setting operation, that is, while it is in the time display operation, the current supplied to the base of the transistor 15 through the diode 7 and the resistor 12 disappears. Since the current from segments 1 and 2 of the display element is supplied through both the transistor 15 and the current from the display element segments 1 and 2, the transistor 15 remains conductive, and since the voltage VDD is not applied to the time set input, the time display cannot be changed. There is no risk of it happening.

Eventually, when the operation of the integrated circuit 1 is switched to the sleeve set after a predetermined period of time due to the application of the voltage VDD to the sleeve switching input, the display state of the numeric display device 2 changes as shown in FIG. 3.

That is, since the sleeve operating time is generally set to a maximum of 59 minutes, the display element that displays the hours disappears and only displays the minutes.

Therefore, the base current supplied from the diodes 8 and 9 also disappears, so the transistor 15 is cut off, and the transistor 16 becomes conductive.
D is supplied and the sleeve time set state is entered.

As a result, regardless of the operating state of the switch 3, the voltage VDD is not applied to the time set input until the operation of the integrated circuit 1 is switched to the sleeve time set.
It is possible to completely eliminate the situation where the time display is changed depending on how the switch 3 is pressed as in the conventional case.

Furthermore, when the switch 3 is operated and the contact C chattering occurs, the capacitor 6 prevents the transistor 15 from malfunctioning.

Therefore, if the switch 3 is released when a predetermined time is displayed depending on the display state of the display device 2, the contact C opens and the resistance 1
0,11. The base current is supplied again through the diode 7 and the resistor 12, and the transistor 15 becomes conductive, thereby turning off the transistor 16 and ending the setting of the sleeve time.

At this time, the capacitor 4 and resistor 5 provide an appropriate delay time for switching the integrated circuit 1, as in the case of FIG.

Note that the integrated circuits necessary for carrying out the present invention include, for example, MK-50366N and MK-
50365N is known, and it is obvious that any integrated circuit similar to this may be used.

As described above, according to the present invention, no matter how the sleeve setting switch 3 is operated, the signal is applied to the sleeve switching of the integrated circuit 1 until the integrated circuit 1 is actually switched. Since no signal is applied to the time set input, there is no risk of malfunction in the time display even if there is a delay in the switching operation of the integrated circuit 1 due to time division operation, and the user can It is possible to provide an electronic watch that anyone can easily use without requiring special operations.

[Brief explanation of the drawing]

Figure 1 is a wiring diagram of an input switching circuit in a conventional electronic watch, Figure 2 is a wiring diagram of an input switching circuit in an electronic watch according to an embodiment of the present invention, and Figure 3 shows the display state when setting the sleeve time. It is an explanatory diagram showing an example. 1...Clock integrated circuit, 2...Numeric display device, 3...Sleeve time setting switch.

Claims (1)

[Scope of utility model registration request] An electronic circuit that has functions such as a sleeve and an alarm in addition to a time display function, and is configured to perform these functions by time-division operation, and a sleeve time setting device that is connected to the sleeve switching input terminal of this electronic circuit. a switch and a first group of segments for indicating hours and a second group of segments for indicating minutes coupled to a display output of the electronic circuit;
When the above switch is in the first mode (open), the hours and minutes are displayed, and when the above switch is switched from the first mode to the second mode, the display contents change to hours and minutes after a predetermined delay. An electronic timepiece comprising a display device, the switch being coupled to the first segment group and a time set input of the electronic circuit, the switch being coupled to a time set input of the electronic circuit when the switch is in a first mode or when the display is in hour and minute display. circuit means are provided for cutting off the voltage coupled to the time set input of the electronic circuit and supplying a voltage to the time set input when the switch is in the second mode and the display is in minutes; is connected to a first segment group of the switch, and detects a time display voltage that is supplied to the first segment group for the predetermined time period when the switch is in a second mode and the first segment group is displaying the hour. a detection circuit, the detection means being coupled to a time set input terminal of the electronic circuit, for blocking the supply of a time set voltage to the time set input terminal when the hour display voltage is detected;
An input switching circuit for an electronic timepiece, comprising a control circuit that supplies a time set voltage to the time set input terminal to control the electronic circuit to a time set mode when the time display voltage disappears.