JPS5815753B2 - Digital alarm density key - Google Patents

Description

Detailed Description of the Invention The present invention uses a relatively high frequency oscillator such as a crystal oscillator as a time standard, uses a complementary field effect transistor with low power consumption as an electronic circuit, and uses a fully electronic system with an alarm function. The present invention relates to a method of notifying a user of the alarm time when the alarm time has arrived in a digital alarm clock.

Conventional alarm clocks, when the alarm set time arrives,
This system uses a sounding mechanism such as a buzzer to notify the user's hearing, and is very convenient when used as an alarm clock.

However, there are many cases where you do not want the ringing mechanism to ring in quiet places such as during meetings or lectures.

On the other hand, a large amount of energy is required to make a sounding device such as a buzzer sound, and when using a small battery such as in a wristwatch, the battery life is shortened and the user must replace the battery frequently. , which has the disadvantage of being extremely troublesome for the user.

Therefore, it would be convenient if a sounding device such as a buzzer could be sounded to the user, and if the alarm time could be notified by visually appealing to the user.

From the above point of view, the present invention provides a digital alarm clock in which, when the alarm time arrives, if the time display is always on, the time display blinks, and vice versa, the time display always blinks. The present invention aims to provide a system that notifies the user by stopping the flashing when the flashing occurs.

The present invention will be described in detail below based on the drawings.

FIG. 1 is a basic block diagram of the digital alarm electronic timepiece of the present invention, and parts not directly related to the present invention are omitted for the sake of simplification of the drawing.

In actuality, a time adjustment mechanism, an operation switch, a calendar function, an alarm time setting mechanism, etc., are added to the product as a clock, but these are omitted because they are not directly related to the present invention.

In FIG. 1, 1 is a time reference pulse generator, and a crystal oscillator is usually used.

The signal from the pulse generator is frequency-divided by a frequency dividing circuit 2 to an appropriate frequency.

3 is a clock circuit that performs frequency division necessary for time display; 4 is a decoder; 5 is a driver 7 that drives digital display means 6; OR gate; 8 is a comparison circuit that stores information in a memory circuit 9 that stores alarm time and clocks This is a circuit that emits a signal when the information in the circuit 3 matches, 11 is a sound generating means such as a buzzer and a driving circuit, and 10 is a switch.

In FIG. 2, 12 indicates the signal waveform from the frequency divider circuit 2 to the OR gate 1, and 13 indicates the output waveform from the comparator circuit 8.

14 shows the output waveform from the OR gate 7.

15 shows the output waveform from the OR gate 7 when the signal 13 is negated (ie, inverted).

Next, the operation of this circuit will be explained.

If no signal comes from the comparison circuit 8 to the OR gate 7, that is, at time T in FIG.

The time period from to T1 is the output waveform 1 from OR gate 7.
4 is High and is input to the driver.

If the circuit configuration of the driver 5 is such that the display means 6 is always turned on when receiving a high input signal, the display means 6 will turn on the time according to the signal from the decoder 4.

Next, when a signal is output from the comparator circuit 8, that is, from time T1 to time T2 in FIG. 2, it becomes a periodic pulse waveform and is input to the driver as shown by waveform 14. The display means 6 starts blinking.

At time T2, the signal from 8 is turned off manually or by circuitry.
This is the time when f.

The time period from time T2 to time T3 is time T.

In the same way as the operation from to time T1, the display means 6 returns to the state where the display is always lit.

Next, if the signal from the comparator circuit 8 does not come to the OR gate 7, the signal becomes 10w1, and if the signal comes to the OR gate 7, it becomes High, that is, if the waveform of 13 is reversed, the display means 6 will show that the alarm time has arrived, contrary to what was described above. You can make the display that was blinking when it stops blinking.

As described above, according to the present invention, when the alarm time arrives, if the time display is always lit, the time display is made to blink, and conversely, if the time display is always blinking, it is made to blink. It is possible to notify the user by stopping the alarm, which has great utility as a digital alarm clock.

[Brief explanation of the drawing]

FIG. 1 is a basic block diagram of an embodiment of the digital alarm clock of the present invention, and FIG. 2 is a waveform diagram of each part. 1... Vibrator, 2... Frequency dividing circuit, 3... Timing circuit, 4...
...Decoder, 5...Driver, 6...Bale indicating means,
7...OR gate, 8...Comparison circuit, 9...Memory circuit,
10...Switch, 11...Alarm drive circuit and means, 1
2...Output signal of frequency dividing circuit 2, 13...Output signal of comparison circuit 8, 14...Output signal of OR gate 7, 15...O
Output signal of R gate 7.

Claims (1)

[Claims] 1. In a digital alarm electronic clock that has a digital display means for displaying the time using an electro-optic display element such as a liquid crystal or a light emitting diode, and an alarm time setting means, there are two types: continuous lighting and intermittent lighting, that is, blinking. It is characterized by comprising means for switching the drive mode of the digital display means from one of the drive modes to the other, and configured to switch the drive mode of the digital display means when an alarm setting time is reached. A digital alarm electronic clock.