JPH0249475B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a timepiece having a timer function and a stopwatch function, and more particularly to a digital display electronic timepiece having a time measurement function used for special purposes such as yachting.

In recent years, digital display electronic watches have become more multi-functional, for example, they can be used to set any time in advance.
When started by an external switch, the timer function subtracts the set time and emits a warning sound when it reaches zero, and the stopwatch function that can measure elapsed time in units of 1/100 seconds are essential functions for functional watches. ing. These functions are mainly used by referees and spectators in sports competitions, with the timer function being used in sports such as basketball and soccer that compete within a set time, and the stopwatch function being used in sports such as track and field. Each one is helpful.

However, depending on the competition, the normal timer function or stopwatch function may not be sufficient. For example, there is a sailing competition. Let me briefly explain about sailing competitions. In sailing competitions, a start warning flag is displayed a certain amount of time (usually 10 minutes) before the start. Then, each yacht waits for the start without sailing behind the starting line. At the start time, the start flag is set and each yacht begins running towards the goal.
The first one to reach the goal wins. However, if a yacht that is already over the starting line is caught at the start, it will be considered a flying race and will be awarded 10 points.
It will restart in minutes. According to the above rules,
For sailing competitions, it would be convenient to have a watch with a repeat timer function and a stopwatch function. The timer function with repeat measures the time from the start notice to the start, and has a repeat function in case there is a flying event.
The stopwatch function measures the time from start to finish.

However, when trying to time a sailing competition using a watch with the above functions, the timer function is first called up, the time from the start notice to the start is set, and the timer starts subtraction at the same time as the start notice. Then, at the same time as time-up, the stopwatch function must be called to start the stopwatch. If there is a flying start, you will need to reset the stopwatch and call up the timer function again to prepare for time-up. This is not only complicated to operate, but also causes measurement errors because the stopwatch cannot be started immediately.

In order to eliminate the above-mentioned drawbacks, the present invention
By starting the stopwatch from zero based on the timer's time-up signal, and continuing to display the timer when there is a flight, and switching to the stopwatch display with a simple operation when there is no flight, this feature is useful for sailing competitions. It is an object of the present invention to provide a clock which is very convenient and which can also be used as a timer function and a stopwatch function in other applications without any trouble.

The present invention will be explained in detail below with reference to the drawings. 1st
Figures a to d are schematic diagrams of an electronic timepiece according to the invention. FIG. 1a shows a timer time setting display, and the timer time can be set by switch SW1. Subtraction of the timer time can be started by turning on switch SW2. Figure 1b shows the display while the timer time is being subtracted.
By turning SW4 ON, it is possible to shift to the stopwatch display. FIG. 1c shows a timer time-up display. When this state is reached, the set time is set again and subtraction continues. Incidentally, FIG. 1d shows a stopwatch counting display. Second
The figure is a block diagram of an implementation circuit of the present invention. Reference numeral 4 is a timer setting register, which can be set by switch SW1 by one feed when the switch starts up, and by fast forward if the switch is turned on for a certain period of time or more. 7 is a timer subtraction register, and preset input terminals DB1 to DBn are connected to output terminals QA1 to QAn of the timer setting register. Output terminal QB1 of timer subtraction register 7
QBn is Y1 of zero detection circuit 8 and switching circuit 15
Connected to Yn. Output terminals QC1 to QCn of the stopwatch register 11 are connected to X1 to Xn of the switching circuit 15, and when φ is at the "0" level, Y1 to Yn are output to the output terminal of the switching circuit 15, and when φ is In the case of the "1" level, X1 to Xn are output, and the signals are connected to the decoder 16. The output of the decoder 16 is connected to a driver 17, and the output of the driver 17 is connected to a display 18. The operating principle will now be explained based on FIG. When switch SW1 is turned on, the timer setting register becomes plus 1 via chattering prevention circuit 1, one-shot pulse generation circuit 2, and OR gate G3.
is set. If the switch SW1 is kept ON, the second input from the top of the inputs of the AND gate G1 becomes "H" level. Since the output of the switch timer 3 is at the "L" level, the third input from the top of the AND gate G1 becomes the "H" level via the inverter N2. Therefore AND
The input clock CL1 of the gate G1 is input to the CL terminal of the switch timer 3. switch timer 3
When a certain period of time has elapsed (usually about 1 second is appropriate), the output becomes "H" level, and the inverter N2
The third input of AND gate G1 is set to “L” through
level, and the clock CL1 is no longer input to the switch timer 3. Furthermore, AND gate G2
Since the second input from the top goes to "H" level, the fast forward clock CL2 is connected to the clock terminal CL of the timer setting register 4 via AND gate G2 and OR gate G3, and to the preset terminal of the timer subtraction register via OR gate G5. Entered into PRSET. Therefore, the timer setting register 4 is set to fast forward by the fast forward clock CL2, and the same contents as the timer setting register 4 are set in the timer subtraction register 7. Therefore, switch SW1
When turned OFF, the reset terminal R of the switch timer 3 becomes "H" level via the chattering prevention circuit 1 and inverter N1, and the switch timer is reset, and the second input of the AND gate G2 becomes "L" level. Fast forwarding of the timer setting register is stopped. At this time, since the output Q of the flip-flop (hereinafter referred to as FF) 14 is at the "L" level, the switching terminal φ of the switching circuit 15 is also at the "L" level.
The input, that is, the contents of the timer subtraction register 7 is output, and the signal passes through a decoder 16 and a driver 17, and a display 18 displays the timer setting time.

Next, when the switch SW2 is turned on, the output Q of the FF6 is inverted from the "L" level to the "H" level via the chattering prevention circuit 5. Then, the second input of AND gate G4 and the input connected to the output of FF14 become "H" level, so clock CL3 is input to clock terminal CL of timer subtraction register 7 via AND gate G4, and the timer Subtraction in the subtraction register 7 is started. At the same time, the input connected to the output Q of FF6 of AND gate G7 also goes to "H" level, so clock CL4 (100 Hz for 1/100 second display) is sent to the stopwatch register via AND gate G7. 11
The stopwatch also starts counting. Now if you turn on switch SW2 again
FF6 is inverted and FF6 of AND gates G4 and G7
Since the input connected to output Q of
The clock CL4 is no longer input to the stopwatch register 11. Therefore, both the timer and stopwatch are stopped. When switch SW3 is turned on in this state, a one shot pulse is input to AND gate G6 via chattering prevention circuit 9 and one shot pulse generation circuit 10. Since the input connected to the inverter N3 of the AND gate G6 is at the "H" level, the one shot pulse is connected to the reset terminal R of the stopwatch register 11 via the OR gate G8 and the OR
It is input to the preset terminal PRSET of the timer subtraction register 7 via the gate G5. Therefore, the timer is set to a set time and the stopwatch is reset.

Let us consider a case where the timer times out while the output Q of the FF6 is at the "H" level, that is, the timer and stopwatch are both measuring. When the zero detection circuit 8 detects the time-up of the timer subtraction register, the output of the zero detection circuit OUT
is the timer subtraction register 7 via OR gate G5.
The preset terminal PRSET of is set to "H" level to reset the set time in the timer subtraction register 7. Furthermore, the zero detection circuit 8 resets the stopwatch register via the OR gate G8. Both the timer subtraction register 7 and the stopwatch register 11 continue to measure even after being preset and reset. However, even in this state
Since the output Q of the FF 14 is at the "L" level and the switching terminal φ of the switching circuit 15 is also at the "L" level,
The contents of the timer subtraction register 7 are displayed on the display 18.

Next, when switch SW4 is turned on, the chattering prevention circuit 12 and one-shot pulse generation circuit 13 are activated.
A one shot pulse is input to the clock terminal CL of the FF14 via the AND gate G9. Then, the output Q of the FF 14 becomes "H" level, the switching terminal φ of the switching circuit 15 becomes "H" level, the switching circuit 15 outputs X1 to Xn, that is, the contents of the stopwatch register 11, and the decoder 16 and driver 17. After that, the stopwatch contents are displayed on the display 18.

To explain how to actually use it as a yacht timer, first set the start notice time with switch SW1, then turn on switch SW2 at the same time as the start notice. The race will start at the same time as the timer times up, but if there is a flying start, the next time will start without any action being taken. If there is no flying, switch
If SW4 is turned ON, the stopwatch will be displayed.
However, since this stopwatch starts from zero at the same time as time-up, accurate measurement values can be expected.

The above is the operating principle of the implementation circuit of the present invention.

As described above, according to the present invention, an electronic watch having a normal timer and stopwatch function can be used in yachting competitions by adding a circuit that resets the stopwatch based on the timer's time-up signal and a circuit that switches the display from the timer to the stopwatch. It has the effect of presenting a very convenient electronic clock. Furthermore, the additional function described above is a very simple circuit and can be ignored in terms of the overall circuitry of the electronic timepiece circuit, and the addition of this function does not pose any problem in using the timer and stopwatch individually.

[Brief explanation of the drawing]

FIGS. 1a to 1d are schematic diagrams of display modes of an electronic timepiece according to the present invention, respectively. FIG. 2 is an example of a circuit block diagram for implementing the present invention. 1, 5, 9, 12...Chattering prevention circuit,
2, 10, 13...One-shot pulse generation circuit, 3...Switch timer, 4...Timer setting register, 6...T-type flip-flop, 7...Timer subtraction register, 8...Zero detection circuit, 11...
... Stop watch register, 14 ... D-type flip-flop, 15 ... Switching circuit, 16 ... Decoder, 17 ... Driver, 18 ... Display body, G
1, G2, G4, G6, G7, G9...AND gate, G3, G5, G8...OR gate, N1,
N2, N3...Inverter.

Claims (1)

[Claims] 1. At least a set time storage means for storing a set time, a timer clock means for presetting and subtracting the set time stored in the set time storage means, and an input from an external operating member. a timer clock control means for controlling the operation of the timer clock means and the stop watch clock means; a zero detection means for generating a time-up signal when the timer clock means finishes counting; and a signal from the zero detection means to control the stop watch. The timer is automatically set to an initial state, and the stopwatch timer continues measurement from the initial state, and the timer is preset by the signal from the zero detection means, and the output of the timer timer is controlled by the timer. and a control means for switching and displaying the timing contents from the timer clocking means and the stopwatch clocking means and prohibiting the operation of the timer by input from an external operating member different from the external operating member; and a displaying means. A digital display electronic watch characterized by having: