JPS6012595B2 - electronic clock - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electronic watch, particularly an electronic wristwatch, having an alarm function.

SUMMARY OF THE INVENTION An object of the present invention is to provide a highly accurate and portable digital electronic timepiece by adding a self-awareness function to the electronic timepiece.

Another object of the present invention is to provide an electronic wristwatch with a self-awareness function using a low power consumption sounding device without increasing the battery capacity. Still another object of the present invention is to provide an electronic timepiece that generates an intermittent sound by effectively using a signal in the middle of a frequency divider circuit in order to further ensure the awareness function. Most conventional electronic watches do not have a self-awareness function, and even if they do, they use commercial AC power and consume relatively large amounts of power.

In addition, the main sound generation means are electromagnetic vibration of a vibrating piece powered by an AC power source or a small electromagnetic speaker, with the exception of a contact type buzzer. These sound generating means have poor electro-mechanical conversion efficiency, and therefore cannot be used in portable devices, especially wristwatches, which consume a large amount of power and have limited power supplies. The present invention provides an electronic wristwatch that solves all of these drawbacks, and will be described in detail with reference to the drawings.

FIG. 1 is a diagram showing the principle of a solid piezoelectric element buzzer, which is the sounding means of the present invention.
rTi)03) Other piezoelectric element electrodes, 2 is a diaphragm, and 3 is an alternating current or pulse power source.

The resonance frequency of this piezoelectric buzzer is determined by the materials, sizes, bonding methods, etc. of the piezoelectric element 1 and the diaphragm 2, and any frequency can be obtained. If the frequency of the power source 3 is set to a value equal to this resonant frequency, the Q (quality factor) of this speaker will be large, so it will produce sound with very low power. Therefore,
It is preferable to drive with a power source having a frequency equal to this resonant frequency. At this time, the vibration mode N performs bending vibration as shown by the dotted line in FIG. 1, and generates an audible sound. FIG. 2 shows an example of the piezoelectric buzzer drive circuit of the present invention. Constants are determined so that the transistor Trl, the voltage buzzer 4, and R and C oscillate at the resonant frequency. Transistor Tr
2 is a switching element whose control terminal is NANDed with the output signal A from the coincidence detection circuit and the signal B of an appropriate period output from the middle stage of the frequency divider circuit of the clock, which is an intermittent signal.
It is input through a gate and is turned on and off repeatedly at the cycle of signal B, generating an intermittent sound at a preset time. The intermittent tone is easier to hear than the continuous tone, and does not cause discomfort to the user. If you want to manually stop the piezoelectric buzzer drive circuit, you can do so by opening the switch 6. Even when you are not using the clock as a reminder, you can open this switch and no sound will be emitted. The block diagram of the digital electronic watch used is shown, and S is a standard pulse generator, which includes a crystal oscillator or a metal tuning fork oscillator.
Alternatively, it may function as a 60Hz pulse generator.

y' Well, this shows a case where a frequency divider that outputs a signal to generate a sound cutoff for a piezoelectric buzzer takes out a signal with a period of 1 second, for example.This signal is not limited to a period of 1 second. It can be made longer or shorter depending on the purpose of use, and any signal that is in the process of being divided into time display signals is sufficient. shows.

Reference numeral 9 denotes a setting circuit for setting the time at which the piezoelectric buzzer sounds, and is set by, for example, a digital switch or an electronic circuit storage device.

10 is a coincidence detection circuit between the time signal 8 and the signal from the time setting circuit 9, and 11' is a piezoelectric buzzer and a piezoelectric buzzer drive circuit shown in FIG.

2 is a decoder and display drive circuit for driving the display device 3 from the time signal. As the display device 13, various display devices such as a liquid crystal display, a light emitting diode or other solid state display device, a filament display, a tonic display, a total light display tube, etc. are used. For wristwatches with limited power supply capacity, liquid crystal display devices with low power consumption are preferable. Here, a crystal oscillator (16384Hz input circuits 6 and 7) is used as a standard pulse generator.
, 8, 10, and 12, the power consumption when a digital switch is used to set the CMOSt time and a liquid crystal display is used for the display is as follows. When it is activated, oscillation: 1 frequency A Frequency division 1 frequency A Matching circuit 3 frequency A Display related 10〃A Total 15 frequency A Fully aware of the buzzer relationship, 1.5V, 100
Since the water flows through the water, if you draw two sands per day, the amount of sand for one year is 730, which is about 2 hours per year.

Therefore, assuming 200〆AH, the average for one year is 0.02
The amount of power consumed is A, which is a power consumption that can be ignored compared to the above-mentioned total of 15 μA. Batteries used in regular watches are 1.5V.
Since it is 160 kites AH, the average current that can be passed for one year is 1
The total current of 15 peaks A can be used for a full year, making it suitable for use as a self-aware wristwatch.

Note that there is no particular need to use CMOS for table clocks with large battery capacities or clocks that use AC power. As mentioned above, the present invention makes it possible to add a self-awareness device to all electronic watches, including wristwatches, with low power consumption, and by making effective use of circuits, it is possible to provide a reliable self-awareness function, and the effect is Very large.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing the principle of a piezoelectric buzzer, where 1 is a solid piezoelectric element and 2 is a diaphragm. Fig. 2 shows an example of a piezoelectric buzzer drive circuit, and 4 is a Shoden buzzer. Fig. 3 1 is a block diagram of the digital electronic clock of the present invention, 1 is a sounding and driving device; 1 is a digital display device; FIG.

Claims (1)

[Claims] 1. A time standard pulse generator with a relatively high frequency, frequency dividing means for dividing the output signal of the time standard pulse generator into a frequency suitable for time display, and a predetermined resonance frequency that generates sound at a preset time. a sounding means consisting of a solid piezoelectric element buzzer, a setting means for setting the time at which the sounding means is operated, a coincidence detection means for comparing the time signal output from the frequency dividing means and the time set by the setting means; The apparatus comprises a driving means and a display means for driving the sounding means intermittently at a cycle of approximately 1 second to generate an intermittent sound using a signal outputted from an arbitrary intermediate stage of the frequency dividing means in accordance with the output of the coincidence detecting means. An electronic clock that is characterized by: