JPS5990077A - Electronic timepiece - Google Patents

Abstract

PURPOSE:To set an accurate alarm time by simple mechanism and easy operation by being constituted of the 1st electroric timepiece having a means of transmitting a time difference in the form of a digital signal and the 2nd analog electronic timepiece having a means of generating an alarm tone when counting operation is completed. CONSTITUTION:A voltage induced at an antenna coil 7 for reception is amplified and detected by a receiving circuit 18 and the time difference between the current time calculated by the 1st electronic timepiece and alarm time is inputted to a shift register 19. When the shift register 19 inputs all data, a presettable down counter 20 reads the data and starts subtraction, as a clock, the necessary frequency-division stage output of a frequency divider 14. When the counted value of the presettable down counter 20 decreases to zero, a speaker driving circuit 21 operates and a speaker 22 generates an alarm sound. Consequently, the 2nd electronic timepiece need not make the position of a hand driven by a stepping motor 16 coincide with the logical state of a logical circuit previously.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electronic watch, and more particularly to an electronic watch with an analog display and an alarm function.

Conventional analog display watches with an alarm function either have an alarm time display hand in addition to the normal time display hand, or the time display hand is electrically connected to the desired time when setting the alarm time. One of the methods of moving the hands and then returning them to the current time has been adopted. However, the former method has the drawback that the mechanism is complicated and the alarm time is not accurate, while the latter method has the drawback that it is cumbersome to operate.

In view of the above-mentioned points, the present invention aims to realize an electronic clock with an alarm function of an analog display type, which allows accurate alarm time setting with a simple mechanism and easy operation.

Next, the present invention will be explained in detail according to examples.

FIG. 1 is a block diagram of a first embodiment of an electronic timepiece according to the present invention. In FIG. 1, the output of an oscillation circuit 1 is frequency-divided by a frequency divider 2, and further counted by a time counter 3. The count contents of the time counter 3 are displayed on a display 4 and are inputted to a calculator 6 through a latch 5. On the other hand, when the alarm time is entered manually from the keyboard 7, the keyboard interface 8 gives the time information to the computing unit B through the latch 9. Arithmetic unit 6 subtracts the time set in latch 5 from the time set in latch 9, and outputs this difference to multiplexer 10. That is, the time difference obtained by subtracting the current time from the alarm function is added to the multiplexer 10. The time signal converted into a serial pulse signal by the multiplexer 10 is modulated by the driver 11.
The signal is amplified in width and transmitted from the transmitting antenna coil 12.

At this time, for example, if a carrier wave of about 10 KHz is amplitude modulated and transmitted, the receiving side can receive it with a simple circuit, and time information can be transmitted without contact.

Next, FIG. 2 is a block diagram of a second embodiment of an electronic timepiece according to the present invention, in which an oscillation circuit 169, a frequency divider 14. Motor driver 15. The step motor 16 has a configuration similar to that of a conventional analog display type electronic watch. Elements other than these or parts added for the purpose of the present invention, the voltage induced in the receiving antenna coil 17 is
The signal is amplified and detected at step B, and the time difference between the current time calculated by the first electronic clock and the alarm time is input to the shift register 19. When all the time data has been input to the shift register 19, the presettable down counter 20 reads this data and starts subtracting the necessary frequency division stage output of the frequency divider 14 as a clock. When the count of the presettable down counter 20 reaches zero, the speaker drive circuit 21 operates and the speaker 22 generates an alarm sound. In this way, in the second electronic clock, there is no need to match the position of the hand driven by the step motor 16 with the logic state of the logic circuit in advance, and even if the display is in 12-hour format, the alarm time fiCj can be used simply by increasing the number of bits in the presettable down counter 20, even if it is set in 24-hour format or, if necessary, several days in advance. Further, even if an electronic watch does not have a second hand, the alarm time can be set accurately in seconds.

As described above, the present invention has the effect of adding an alarm function that is easy to operate and has accurate operating time to an analog display type electronic timepiece whose mechanical structure remains the same as usual.

[Brief explanation of drawings]

Figure 1 is a block diagram of an embodiment of the first TIE slave clock.
The figure is a block diagram 1 of an embodiment of the second electronic watch.
...Oscillator circuit 2 ...... Frequency divider 3 ...... Time counter 4 ...... Display 5 ...... ...Latch 6......Calculator 7...Keyboard 8...Keyboard interface 9.
......Latch 10...Multiplexer 11...Driver 12...Transmission antenna coil 16...
- Oscillation circuit 14... Frequency divider 15... Motor driver 16... Step motor 17... Receiving antenna coil 18...
・Reception circuit 19...Shift register 20...Presettable down counter 21・
...Speaker drive circuit 22 ...Speaker and above Applicant Daini Seikosha Co., Ltd. Agent Patent attorney Tsutomu Mogami

Claims (1)

[Claims] A first electronic clock having means for setting an alarm time, means for calculating a time difference between the alarm time and the current time, and means for converting the time difference into a digital signal and transmitting it, and means for receiving the digital signal. An electronic timepiece with an alarm function, comprising: a second electronic timepiece of an analog display type having means for counting time by the content of the digital signal and means for generating an alarm sound when the counting is completed.