JPS5814633B2 - How to adjust the time on a digital electronic clock - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for adjusting the time of a digital electronic timepiece using an electronic display device such as a light emitting diode or liquid crystal.

This type of watch can take advantage of its display functions to display calendar functions such as hours, minutes, and seconds, or months, days, and days of the week, either simultaneously or sequentially.

However, as the number of display functions increases, the complexity of modifying display content increases.

In particular, in the case of minute correction, day correction, etc., since these corrections are conventionally performed only by adding counters, it may be necessary to add a number close to 60 or 30.

In other words, when correcting the progress of 1 minute or the progress of 1 day, it is 59 minutes, 30 days, or 29 minutes, respectively.
Requires date correction.

Therefore, a subtraction function is added to the counter in addition to the addition function, and switching between addition and subtraction is performed by operating an external switch.

By doing so, it is possible to eliminate the trouble of making corrections like in the Joki.

However, in this case, a dedicated switch for switching between addition and subtraction is required.

An increase in the number of switches is undesirable, especially in wristwatches.

This is because it not only increases cost and reduces reliability due to moisture-proofing and waterproofing, but also has a drawback in terms of simplicity in design.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a time adjustment method that can perform addition/subtraction switching without requiring a dedicated switch. explain.

When a correction switch (not shown) is operated, an external control signal is applied to the control circuit 1 and a correction command signal is applied to the gate 2, and the gate 2 opens and the clock signal source 3
This clock signal is supplied to the counter 4, and the counting result of the counter 4 is converted into a signal by the decoder 5, so that the display on the display device 6 changes in fast forward mode, and this point is the same as the conventional one. .

The output of the decoder 5 is applied to an odd-even judgment circuit 7, where it is judged whether the number currently displayed on the display device 6 is an odd number or an even number, and the judgment result is always sent to the control circuit 1. It has become.

The counter 4 is an up-down counter, that is, it is equipped with a subtraction circuit in addition to an addition circuit, and performs an addition operation when an addition command signal is input, and a subtraction operation when a subtraction command signal is input. It has become.

Therefore, when the correction switch is operated, the control circuit 1 applies an addition command signal or a subtraction command signal to the counter 4 according to the determination result from the odd-even determination circuit 7. Whether to add or subtract is determined depending on whether the displayed number is odd or even.

For example, when the displayed number is an even number, operating the correction switch performs addition, and when the display number is odd, operating the correction switch performs subtraction.

In the above, the addition and subtraction of the counter was switched by determining whether the number displayed was odd or even, but if the display of the display device repeats blinking at a certain period of 1 or 2 seconds, it is necessary to determine whether the light is on or off. For example, when the correction switch is operated when the light is on, addition may be performed, and when the correction switch is operated when the light is off, it may be subtracted.This is also an embodiment of the present invention. .

In this case, the configuration is such that the determination is made only when the correction switch is operated, and thereafter switching between addition and subtraction is prohibited while the correction continues.

As described above, the time adjustment method of the present invention determines whether the displayed number is odd or even, or whether the display format is blinking, etc., and adds or subtracts the counter depending on the result of the determination when the switch is operated. There is no need for a dedicated switch to switch between adding and subtracting the counter, and the display can be corrected both additively and subtractively using only the correction switch, making time correction extremely convenient. Cost increases and design problems can be avoided.

[Brief explanation of the drawing]

The drawing is a block diagram for explaining one embodiment of the present invention. 1...Control circuit, 4...Counter,
5...Decoder, 6...Display device, 7
・・・・・・Odd-even judgment circuit.

Claims (1)

[Claims] 1. An odd-even judgment circuit is provided in the control circuit that can control the count of the counter circuit to add or subtract, and this odd-even judgment circuit detects the difference in the number of displayed counter outputs, whether odd or even, or the difference in the blinking of the output. When the time adjustment switch is operated, the count of the counter can be added or subtracted based on the determination result of the odd-even determination circuit at the time of operation, so that the time adjustment iF on the display device is the same. A method for adjusting the time of a digital electronic watch, characterized in that the time can be adjusted by the same operation using a switch.