JPS632475B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pointer display stopwatch that displays a measured time using a pointer moved by a step motor.

As an alternative to the conventional mechanical stopwatch, a pointer display stopwatch has been devised in recent years that uses a crystal oscillator as a time reference source and displays the measured time by means of a pointer that is moved by a plurality of step motors. However, as is well known, even one step motor requires a large amount of power to operate, so in order to operate multiple step motors, a battery with a large capacity, or in other words, a large size, is required, resulting in a battery the size of a wristwatch. It was impossible to realize a miniaturized stopwatch with a pointer display.

The present invention eliminates such drawbacks, and its purpose is to reduce the electric power used to operate the step motor by operating the step motor and displaying the measured time only when it is desired to know the measured time.
To provide a stopwatch with a pointer display that is the same size as a wristwatch and allows the use of a small battery.

Hereinafter, the present invention will be explained in detail based on Examples.

In this example, the 1/10 second digit is displayed.
Equipped with a 10-second hand, a second hand that displays the seconds digit, and a minute hand that displays the minute digit, and each pointer is normally set to 0.
A pointer display stopwatch that waits at a certain position and indicates the measurement time in response to a time measurement stop command signal and an intermediate time display command signal (split signal Sp) will be described.

FIG. 1 is a block diagram of this embodiment. In Figure 1, 3, 4, 5, 6, 7, 8, 9, 10,
11 and 12 are components for displaying 1/10 second digits, and 13, 14, 15, 16, 17, 1
8, 19, 20, 21, 22 are components for displaying seconds digits, 23, 24, 25, 2
6, 27, 28, 29, 30, 31, and 32 are components for displaying minute digits. 34 is a 10 minute detection circuit that detects a predetermined time of 10 minutes after the start signal is input. The 10 minute detection circuit 34 is "L" for less than 10 minutes after the start of measurement and becomes "H" after 10 minutes.The signal 10min is sent to each drive control circuit 8, 18, 28.
is being entered.

1 is a time standard source, which is composed of a crystal resonator and an oscillation circuit, and generates a 32768 Hz reference signal. 2 is a frequency dividing and waveform shaping circuit that sequentially divides the 32768 Hz reference signal to form a 16 Hz signal φ16, which also serves as the reference for stopwatch time measurement.
A Hz signal φ10 is formed. Reference numeral 58 denotes a switch that is closed when a signal (start/stop signal) St output from the switch control circuit 33 for instructing the start and stop of time measurement is "H". Below, 1/1
The blocks necessary to display the 0 second digit will be explained. 3 is a decimal 1/10 second time counter whose states of α, β, γ, and δ change with the falling edge of the clock input to the clock terminal (Cp terminal), and a 10Hz signal φ1 that is the reference for time measurement of the stopwatch.
0 is counted and a signal (reset signal) Re output from the switch control circuit 33 to command the hammer.
It is reset by 4 is a signal (split signal) output from the switch control circuit 33 that is input to the Cp terminal and holds the data (D ₁ , D ₂ , D ₃ , D ₄ ) when Sp is “H”. However, it is a latch circuit that passes when it is "L". 5 is a coincidence detection circuit that compares the contents of the latch circuit 9 (θ ₁ , θ ₂ , θ ₃ , θ ₄ ) with the contents of the 1/10 second hand position counter (α, β, γ, δ), and determines whether the contents are correct. A match signal Ye1/10 of "H" is output when there is a match, and "L" when there is no match.
Reference numeral 6 denotes a 1/10 second hand position counter that stores the indicated position of the 1/10 second hand 12, and is constructed in exactly the same way as the 1/10 second time counter 3, and receives a motor drive signal φM1/10 for moving the 1/10 second hand. A signal for counting and changing the 0 position of the 1/10 second hand output from the switch control circuit 33 (1/10 second hand set signal)
When Se1/10 is input to the reset terminal (R terminal), it is reset. 7 is 1/10 second hand is 0 (zero)
This is a 1/10 second hand 0 position detection circuit that outputs a 1/10 second hand 0 position signal 0 1/10 which is "H" when the position is specified and "L" otherwise. 8 is a 1/10 second hand drive control circuit, which supplies a 10Hz signal φ10 to the step motor 10 and the 1/10 second hand position counter before the 10 minute detection circuit outputs the 10 minute detection signal;
When the minute detection signal 10min and the 0 position signal 01/10 are input, the supply of the 10Hz signal is stopped. At that time, when the start/stop signal St is "H", the split signal Sp is "L", and the 1/10 second hand 0 position signal is "L", the start/stop signal St is "L" or Split signal Sp
is “H” and the coincidence signal Ye1/10 is “L”, the 16Hz signal φ16 is used as the motor drive signal φM
Output as 1/10. Reference numeral 9 denotes a drive pulse shaping circuit which generates a step motor drive pulse PM1/10 for driving the step motor 10 in response to the input of the motor drive signal φM1/10 or the 1/10 second hand set signal Se1/10. Output. 10 is a step motor driven by a step motor drive pulse PM1/10.
11 is a gear train linked to step motor 10, 1/10
The second hand 12 is configured to rotate once in 10 steps. 12 is the 1/10 second hand that indicates the 1/10 second digit.

Next, the blocks necessary to display the seconds digits will be explained. In addition, the function of each block is 1/10
This block is similar to the one required to display seconds digits, so we will only explain it briefly. 13 is a sexagesimal second hand hour counter that counts the 1 Hz signal φsec output from the 1/10 second time counter 3. 1
4 is a latch circuit that passes and holds the contents of the seconds counter 13; 15 is latch circuit 1
4 and the contents of the second hand position counter 16 match. 16
is a sexagesimal second hand position counter that records the indicated position of the second hand 22. 17, the second hand 16 is 0 (zero)
Second hand position signal 0sec: “H” when indicating a position, “L” when indicating another position
This is a second hand 0 position detection circuit that outputs. 18 is 1/
This is a second drive control circuit configured in exactly the same way as the 10 second hand drive control circuit. Reference numeral 19 is a drive pulse shaping circuit configured in exactly the same manner as 9, and is a second hand drive control circuit 18.
Motor drive signal φMsec output from the switch control circuit 33 and second hand set signal output from the switch control circuit 33
Step motor drive pulse PMsec corresponding to Se
Output. 20 is a step motor. 21
The second hand 22 is configured to rotate once in 60 steps in the gear train.

Next, we will explain the blocks necessary to display the minute digits, but since each block is constructed exactly the same as the blocks necessary to display the seconds digits, we will only give a brief explanation. 23 is a sexagesimal minute counter that counts the 1/60 Hz signal φmin output from the second counter 13. 24 is a latch circuit. 26 is the minute hand 32
This is a minute hand position counter that stores the indicated position. 2 is a minute hand 0 position detection circuit that detects whether the minute hand has indicated the 0 (zero) position. Reference numeral 28 denotes a minute hand drive control circuit which controls the drive of the minute hand and is configured in exactly the same way as the 1/10 second hand drive control circuit 8 and the second hand drive control circuit 18. Reference numeral 29 denotes a drive pulse shaping circuit that outputs a step motor drive pulse PMmin in response to the motor drive signal φmin and the minute hand set signal Se. 30 is a step motor, 31 is a gear train, and 32 is a minute hand.

33 is external operation member 59, 60, 61, 62
This is a switch control circuit that outputs a start/stop signal St, a split signal Sp, a reset signal Re, a 1/10 second hand set signal Se1/10, a second hand set signal Sesec, and a minute hand set signal Semin in response to the operation. In this embodiment, the external operation member 59
When St is closed, the logic of the start/stop signal St changes to cyclic; when the external operating member 60 closes while St is "H", the logic of the split signal Sp changes to cyclic; when the external operating member 62 closes, the logic of the start/stop signal St changes to cyclic. becomes "H" and the external operating member 62 is closed, by operating the external operating member 59 and the external operating member 60 using the select/set method, the 1/10 second hand set signal Se is set.
The switch control circuit 33 is configured to generate 1/10, a second hand set signal Sesec, and a minute hand set signal Semin. It should be noted that other configuration methods for the switch control circuit 33 may be considered, but their explanation will be omitted here.

This concludes the explanation of FIG. 1, and next, FIG. 2 will be explained.

FIG. 2 shows a specific example of the configuration of the 10-minute detection circuit 34. In Figure 4, 43 is an OR gate, 44,
45 is a NOR gate, 46 is an inverter,
NOR gates 44 and 45 constitute an R-S flip-flop. The terminal I ₆ is connected to the α10 terminal of the minute counter 23, the terminal I ₇ is connected to the β10 terminal of the minute counter 23, the terminal I ₈ is connected to the γ10 terminal of the minute counter 23, and the terminal
A reset signal Re output from the switch control circuit 33 is input to _I9 .

In FIG. 2, when the measurement is completed and a signal (reset signal) Re for commanding the hammering of each hand is input to the terminal _I9 , the minute counter 23 in FIG. 1 is also reset by the reset signal Re. α10, β10,
Since both γ10 are at "L", the signal 10min output to terminal _O2 is always at "L". When 10 minutes have passed since the start of measurement and α10 becomes "H", the 10 minute detection signal 10min also becomes "H", and 10 minutes elapses until the reset signal Re is input to terminal _I9 again.
does not become “L”. Therefore, 10 minutes detection signal 10
min is “L” until the measurement time passes 10 minutes,
After 10 minutes, it becomes "H".

FIG. 3 shows a specific example of the configuration of the 1/10 second hand drive control circuit 8 shown in FIG. In Figure 3, 47, 48,
49, 50 are inverters, 51, 53, 54, 5
5 and 56 are AND gates, 52 is a NAND gate,
57 is a NOR gate. The terminal _I10 receives the start/stop signal St, the terminal _I11 receives the split signal Sp, and the terminal _I12 receives the 1/10 second hand 0 position detection signal 0.
1/10, terminal I ₁₄ has a 10 minute detection signal 10 min
However, the match signal Ye1/10 is at terminal _I15 , and the coincidence signal Ye1/10 is at terminal _I16.
A 10Hz signal φ10 is input to.

In FIG. 3, AND gates 53 and 54 are
This is to control the operation of the pointer 10 minutes after the start of measurement.

AND gates 55 and 56 are for controlling the operation of the pointer less than 10 minutes after the start of measurement, and when the coincidence signal Ye1/10 is "L", the 16Hz signal φ16 is selected as the motor drive signal φM1/10, When the coincidence signal Ye1/10 is "H" and the split signal Sp is "L", the 10 Hz signal φ10 is selected as the motor drive signal φM1/10. Therefore, within 10 minutes after starting measurement, pointer 1 in Figure 3 should be used.
2, when measurement starts, the hand moves at 10Hz, stops when the split time display is displayed, and when the split time display state is canceled, the hand moves fast forward at 16Hz, stops when the stop signal is received, and returns to the zero position at 16Hz during homewarding. It is fast-forwarded when heading to , and always indicates the measurement time.
After 10min becomes “H”, AND gate 53
Therefore, when the start/stop signal St is "H", the split signal Sp is "L", and the zero position detection signal 0 is "L", the 16 Hz signal φ16 is selected as the motor drive signal φM. Also, the start/stop signal St is set to “L” by the AND gate 54.
Alternatively, when the split signal Sp is "H" and the coincidence signal Ye is "L", the 16 Hz signal φ16 is selected as the motor drive signal φM. i.e.
After the 10min detection signal is output (even if St is “H”), a signal commanding to stop measurement (St is “L”) or a signal commanding display of the intermediate time (Sp is “H”) is output. The pointer will wait at the 0 position unless it is, and when either signal (St is “L” or Sp is “H”) is output, the indicated position of the pointer (the contents of the hand position counter) will match the contents of the latch circuit. The hands are moved at a speed of 16Hz until they match (until the match signal Ye becomes "H"). Also, when the signal commanding the intermediate time display is released (when Sp becomes “L”), AND
The gate 53 moves the pointer to the zero position at a rate of 16 Hz. Also, when a signal (St is "H") commanding the start of measurement is output again, the pointer moves at a rate of 16 Hz to the zero position. Also, after the measurement is completed,
When a signal instructing the pointer to point forward (reset signal Re is “H”), the time counters 3 and 1
Since the contents of 3 and 23 become 0 (zero) and the coincidence signal Ye becomes "L", the AND gate 54 causes the pointer to point to the 0 position (the contents of the hand position counter become 0 (zero)). The hands move at 16Hz until the match signal Ye becomes "H".

The second hand drive control circuit 18 and the minute hand drive control circuit 28 in FIG. 1 are also configured in exactly the same way as in FIG.
Enter 0sec and 0min instead of 1/10, and
Yesec and Yemin input instead of 1/10,
Input φsec and φmin instead of φ10, and φM
φMsec and φMmin are output instead of 1/10.

As is clear from FIGS. 1, 2, and 3, the step motors 10, 20, and 30 that drive the 1/10 second hand 12, second hand 22, and minute hand 32 do not display the split display within 10 minutes after the start of measurement. Other than the condition,
Although it is always driven, the pointer is driven when a stop signal or split signal is input after 10 minutes from the start of measurement, so the power required to drive the step motor becomes extremely small. In this case, all hands are activated for 10 minutes after the start of measurement, giving the user a sense of visual satisfaction.

In this embodiment, the 1/10 second hand drive control circuit 8, the second hand drive control circuit 18, and the minute hand drive control circuit 28 shown in FIG.
Although we have given an example in which all the hands wait at the 0 position after 10 minutes, when the battery has sufficient capacity, the second hand drive control circuit 18 and the minute hand are set so that the second hand 22 and minute hand 32 always indicate the measurement time. Drive circuit 28
can be configured.

In addition, in this example, the operating method of each pointer is changed between less than 10 minutes and after 10 minutes, but this time can be any time as long as it is appropriate for the capacity of the battery. It doesn't matter if there is.

Furthermore, although this embodiment does not describe a mechanism for indicating the hour digit, the hour digit can also be displayed by having the same configuration as the mechanism for indicating other digits. can.

As described above, the present invention has the excellent effect that the electric power required to drive the step motor is extremely small, the battery can be made small, and a stopwatch with a pointer display as small as a wristwatch can be realized. It has the following.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of this embodiment, and Fig. 2 is a block diagram of the first embodiment.
A specific example of the configuration of the 10 minute detection circuit 34 shown in the figure, and FIG. 3 is a specific example of the configuration of the 1/10 second hand drive control circuit 8 of FIG. 1. 3,13,23...Time counter, 4,1
4, 24... Latch circuit, 5, 15, 25... Coincidence detection circuit, 6, 16, 26... Hand position counter, 7, 17, 27... Pointer 0 position detection circuit,
8, 18, 28... Pointer drive control circuit, 9, 1
9, 29... Drive pulse shaping circuit, 10, 20,
30...Step motor, 11, 21, 31...
Wheel train, 12, 22, 32...pointer, 33...switch control circuit, 34...10 minute detection circuit.

Claims (1)

[Claims] 1 A frequency dividing circuit 2 that divides the output signal of the time standard source 1 to output a time unit signal, step motors 10, 20, 30 driven by a drive signal based on the output signal of the frequency dividing circuit, and the step motor A time counter 3, 13, 23 that starts counting the time unit signal when a start signal from an external operation switch is input, and the start signal a predetermined time detection circuit 34 that counts a predetermined time since input of the step motor and outputs a predetermined time detection signal; a hand position counter 6, 16, 26 that counts the number of drive signals supplied to the step motor; Coincidence detection circuits 5, 15, and 25 connected between the hand position counters to detect coincidence of count contents based on each count and output a coincidence signal, and output a zero position detection signal at the zero position of the pointer. Zero position detection circuits 7, 17, and 27 are connected between the frequency dividing circuit and the step motor, and are controlled by the external operation switch, the predetermined time detection circuit, the coincidence detection circuit, and the zero position detection circuit. means 56 for supplying a drive signal to the step motor in response to the start signal before outputting the predetermined time detection signal; and means 56 for supplying a drive signal to the step motor in response to the start signal; When the supply to the motor is stopped and the pointer is stopped at the zero position, and a stop signal from the external operation switch is input, the coincidence detection circuit detects the value of the pointer position counter and the time measured when the stop signal is input. A pointer display stopwatch comprising a second hand drive control circuit 8, 18, 28 comprising means 53, 54 for supplying a drive signal to the motor until coincidence of the contents of the counter is detected.