JPH0220955B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a stop watch with a pointer display, and more particularly to the operation of a stop watch.

In conventional stop watches, the reset function is effective only when the stop watch is stopped (stop state).

For example, in a stop watch with a digital display, two switches are used for start/stop, split (intermediate elapsed time display function), and reset functions, making the switch dual-purpose, and the reset is valid only in the stop state.

The stop state is a state in which time measurement is stopped, but the display is also stopped in the split state (internally, time measurement continues), and the display is similarly stopped in the split/stop state. The display is stopped (in this state, time measurement is also stopped, but this is different from the stop state in the explanation). As explained above, there are various states in a stop watch, so even though they are called stop states, there are some states that cannot be distinguished just by looking at the display. For this reason, digital display products have traditionally employed a mode indicator to indicate the current status.

If this function is applied to a stop watch with a pointer display, it will be very difficult to use a mode indicator (although it is possible to display it digitally,
(Undesirable from the design point of view), it was not possible to adopt a method in which the reset was enabled in the stop state. Even with a stop watch with a pointer display,
For products with only start, stop, and reset functions, it is possible to distinguish the stop state, so there were some products whose reset function was effective in the stop state. However, this method could not be adopted for products with a split function. In other words, a stop watch with a pointer display cannot distinguish between a stop state and a split state.

The present invention has been improved in view of these points, and an object of the present invention is to provide a pointer display stop watch that is extremely easy to operate and easy to understand.

This will be explained in detail below using the drawings.

FIG. 1 is an electronic circuit diagram of a pointer display stop watch according to the present invention. Reference numeral 1 denotes an oscillation circuit, which generates a relatively high frequency signal that serves as a time standard. 2 is a frequency dividing circuit, and oscillation circuit 1
Divide the high frequency signal output from the device to the required low frequency signal. 3, 4, 5, and 6 are stop/watch counters, each representing 1/10 second/second/second.
Measures each digit of the minute and hour. 7, 8, 9, 10
is 3, 4, 5, 6 when performing split display.
12, 13, 14, and 15 are latch circuits for holding the counter data of 1/10 seconds.
The hand position counter 11 has data corresponding to the hand position of each digit of seconds, minutes, and hours.The hand position counter 11 checks whether the contents of the hand position counters 12 to 15 match the measured data of the stop watch. 16, 17, 18, 19 are drive circuits that drive each pointer; 21 is each operation switch; 20 is a switch chattering prevention circuit; 2
7, 28, and 29 are signal lines, and 30 is an AND gate.

In the present invention, the reset switch of the stop watch is constructed independently, and the reset function is effective no matter what measurement state the stop watch is in. In other words, even if the stop watch is started and measuring, stopped and stopped, or is in the split state, operating the reset switch will cancel the split, stop measurement (stop state), and reset each counter to its initial state. be done.

The operation of the pointer display stop watch shown in FIG. 1, which is an embodiment of the present invention, will now be described.

First, at the time of starting, the start/stop switch is operated and a start signal is inputted to the AND gate 30 as a logic "1" via the signal line 27. Then, the AND gate 30 opens and starts counting. At this time, the latch circuits 7 to 10 do not operate, and the drive circuits 16 to 16 drive each hand by comparing the output states of the stop watch measurement counters 3 to 6 and the output states of the hand position counters 12 to 15. 17. The hand position counters 12 to 15 indicate the position of each hand and have a one-to-one correspondence with each hand. In other words, when the contents of the stop-watch measurement counters 3-6 differ, each drive circuit 16-17 is controlled in order to move each hand so that the count value becomes the same. When the split state occurs, a split signal is input to each latch circuit via the signal line 28. Then, the contents of the stop/watch measurement counters 3 to 6 at that time are transferred to each latch circuit 7 to 6.
10 holds. As a result, each pointer is stopped, but measurement continues without stopping. However, when the split is released, the contents of the hand position counters 12-15 and the contents of the stop-watch measurement counters 3-6 naturally do not match, so each drive circuit 16-19 is controlled until they match. It moves the needle.

Up to this point, we have explained the operation of the stopwatch from the start of measurement, to the split state, and to the release of the split. However, this part has been well known for some time.

In other words, it is possible to operate the pointer display when the measurement contents and the pointer display are different, for example
It is described in Publication No. 103387.

In other words, from the 11th line in the upper right column to the 10th line in the lower left column on page 4 of Japanese Patent Application Laid-open No. 56-103387, the pointer which is stopped in the stopped state is reset to move it to the position where the normal time is displayed. is listed. Here, "counter 7" corresponds to the stop watch measurement counters 3 to 6 in the present invention, "counter 8" corresponds to the needle position counters 12 to 15 in the present invention, and "comparator 23" corresponds to the stop watch measurement counters 3 to 6 in the present invention. It corresponds to the coincidence detection circuit 11, and "the pulse forming circuit 4 and the motor (excitation) winding 3" correspond to the drive circuit in the present invention.

Further, the latch circuits 7 to 10 for holding the data of the counter during split display in the present invention are not new at all and are well known, but if I had to mention them, they were developed in Japanese Patent Application Laid-Open No.
It is described in Publication No. 54-52578.

This Japanese Patent Application Laid-Open No. 54-52578 also states that the pointer display is operated when the measurement content and the pointer display are different, from the 19th line in the upper left column on page 5 to the bottom line in the upper right column, and "Counter 43" These circuits substantially correspond to latch circuits 7 to 10 in the present invention.

In any case, the operations of the conventionally well-known stop watch described above, from the start of measurement to the split state and the release of the split, are not the most important points of the present invention, and are not important for understanding the present invention. It is simply a necessity.

That is, the most important point of the present invention lies in the operation of the reset switch, and in the present invention, in any of the above cases, by operating the reset switch, a reset signal is transmitted via the signal line 29 to each stop watch measurement. counter 3~6
At the same time, the output signal from the frequency divider circuit is stopped via the signal line 27, and the signal line 28 is reset.
The latch circuits 7-10 are reset via the latches 7-10. This brings the stop watch into its initial state.

FIG. 2 shows part of the control circuit. 22 is a switch signal corresponding to the start/stop switch, and every time this signal is input, the flip/stop switch is activated.
The output of flop 25 is inverted. If the output 27 is "1", it is a start signal to set the start state, and if it is "0", it is a stop signal to set the stop state. The steps up to this point correspond to the first control circuit. Reference numeral 23 indicates a signal corresponding to a split switch, and each time this signal is input, the output of the flip-flop 26 is inverted. When this output 28 is "1", it is a split signal, and the latch circuits 7, 8, 9, and 10 shown in FIG. 1 hold the contents of each counter and display the elapsed time, and when it is "0" is a split release signal, and the split is released and the measured time is displayed. The steps up to this point correspond to the second control circuit. 24 is a signal corresponding to a reset switch, and each counter is reset by this signal 24 or the reset signal 29 corresponding to it, and the flip-flops 25 and 26 are reset, and the split is released and the stop is stopped. state. The steps up to this point correspond to the third control circuit. As a result, even if you do not know what is currently being displayed on the stop watch with the pointer display, you can easily return it to its initial state by operating the reset switch. In particular, when replacing batteries, etc., the initial state may not always be reached. Even in such a case, the initial state can be easily returned by operating the reset switch.

By configuring the reset switch independently,
Although the number of switches increases by one, the operation becomes much easier for the user of a stop watch with a pointer display, and it is possible to provide a stop watch with a pointer display that is easy to understand and easy to use.

[Brief explanation of drawings]

Figure 1: Electronic circuit diagram, Figure 2: Control circuit diagram. 1... Oscillation circuit, 2... Frequency dividing circuit, 3, 4,
5, 6...Stop-watch measurement counter,
11... Match detection circuit, 12, 13, 14, 15
...Needle position counter, 16, 17, 18, 19
...Drive circuit, 20...Chattering prevention circuit,
21...Operation switch, 25, 26...Flip-flop, 27, 28, 29...Signal line, 3
0...and gate.

Claims (1)

[Claims] 1. In a stop watch with a pointer display, which has an independent reset switch in addition to a start/stop switch and a split switch,
An oscillation circuit that outputs a time standard signal, a frequency divider circuit that divides the frequency of the time standard signal from the oscillation circuit, and outputs a start signal that starts measurement and a stop signal that stops measurement in response to operation of the start/stop switch. a first control circuit that measures time by selectively inputting the output signal from the frequency dividing circuit based on the start signal and the stop signal; a measurement counter that measures time by selectively inputting the output signal from the frequency dividing circuit based on the start signal and the stop signal; a second control circuit that outputs a split signal for displaying the pointer of the elapsed time and a split release signal for canceling the pointer display of the intermediate elapsed time and displaying the measured time as a pointer; A latch circuit for storing memory, and on condition that a reset signal is inputted by operating the reset switch, causes the first control circuit to output the stop signal and causes the second control circuit to output the split release signal, and A pointer display stop watch, comprising a third control circuit for resetting the contents of the measurement counter to an initial state.