JPS59135390A - Electronic stopwatch - Google Patents

Abstract

PURPOSE:To reduce the burden on a circuit by dispensing with the counting circuit for a lap time, by calculating the lap time by the operation from a split time without using the counting circuit. CONSTITUTION:A counting circuit begins to count by the input of a start switch. The content of the counting circuit 14 is latched on the basis of the switch input of lap by a latch 1 shown by the numeral 15 and, at the same time, the content of the latch 1 shown by the numeral 15 is latched by a latch 2. The counting circuit 14 stops counting by the switch input of stop. An operation circuit 17 outputs the value calculated by subtracting the valve of the latch 1 shown by the numeral from the value of the latch 2 shown by the numeral 16 to a display circuit 18 as a lap time. The value of the counting circuit 14 is outputted to the display circuit 18 as a stopwatch time while the value of the latch 1 shown by the numeral 15 outputs thereto as a split time. The display circuit 18 displays respective values to a display apparatus 19.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a calculation method for an electronic stopwatch.

As an electronic stopwatch, it has ρ functions such as start, stop, and reset! Basically, this is done at #F, but when the stopwatch is running, it can be used to display the split time, which represents the cumulative time since the start, or the time between the previous split time and the current subIJ::/ time 1. An electronic stopwatch that can also measure lap times and other information has also been commercialized. Traditionally, this kind of product is
To calculate the lap time, there is a counting circuit for the lap time separate from the counting circuit for the stopwatch time, and it displays all data for each lap input and uses the counting circuit 't IJ.
Once set, measurement of the next lap time will begin.
However, it had the disadvantage of requiring two systems of counting circuits. A block diagram of a conventional one-shot embodiment is shown in FIG. 1 is an oscillation divider circuit that oscillates a reference signal source, divides the frequency of the signal, and supplies necessary signals to each part; 2 is a push button switch that is an external operating member; and 6 controls all parts according to the switch input. 9 is a control circuit; 4 is an endurance circuit for the stopwatch; 5 is a counting circuit for lap time; 2; 6 is a latch circuit for split time; 1.7 is a latch circuit for lap time; 8 is a display circuit; is a display device such as a liquid crystal display device. By inputting the start switch of the stopwatch, counting circuits 4 and 5 start counting. Lap manually ((by), latch the values of slip circuits 4 and 5 in latch circuits 6 and 7, respectively, and reset all 50'#Tg circuits 2. Counting circuits 4 and 5 (by stopping manually) The contents of the old number mark 1 are displayed as the stopwatch time, the contents of the latch 1 as the split time, and the Okaya of the latch 2 as the lap time on the display device 9 by the display circuit 8. In this way. Conventional products had two systems of counting circuits, which placed a heavy burden on the circuit.

The object of the invention is to provide a new circuit arrangement which completely eliminates these drawbacks.

In the present invention, the lap time is calculated by calculation from the split time without using a counting circuit.

A block diagram of an embodiment of the invention is shown in FIG.

Reference numeral 11 is an oscillation frequency dividing circuit that oscillates the entire reference signal source, divides the frequency of the signal, and supplies necessary signals to each part; 12 is a push button switch which is an external operating member; and 16 controls all parts according to switch input. A control circuit, 14 is a counting circuit for a stopwatch, 15 and 16 are latch circuits for split time, 17 is an arithmetic circuit, 18 is a display circuit, and 19 is a display device such as a liquid crystal display device. The operation is controlled manually by pressing the start switch and the counting circuit is fully opened. The contents of the 14 elbow number circuits are latched to the 15 latches ILL, and at the same time, the contents of the 15 latch 1 are latched to the latch 2 by the human power of the lap switch. The 14 elbow number circuits are completely stopped by the human power of the stop switch. The 17th arithmetic circuit subtracts the value of the 15th latch 1 from the value of the 16th latch 2 and outputs the value as the full lap time to the 18th display circuit. 1
The value of the counting circuit 4 is 15 as the stopwatch time.
The value of latch 1 is output to the 18 display circuits as the split time. The display circuit displays all of the respective values on 19 display devices. As described above, according to the present invention, the lap time is not counted by the counting circuit, but the difference between the Sgerritt times is calculated by the arithmetic circuit, thereby eliminating the need for a counting circuit for the lap time and reducing the burden on the circuit.

Figure 3 shows 91 lol 21i using uninvention! This is an example of a device that can store a plurality of split times and lap times using a plurality of memories.

21 is an oscillation frequency dividing circuit similar to 11 in FIG. 2, 22 is a switch similar to 12 in FIG. 2, and 26 is a control circuit similar to 16 in FIG. 24 is an elbow number circuit for a stopwatch, and 25 is a storage circuit that can store a plurality of values of the sha/ebi circuit. 26 is an arithmetic circuit, 27 is a display circuit, 2
8 (For example, a display device such as a liquid crystal panel. Note 25 is a circuit that stores the value of the Vc24 memory path for each lap switch manually ((more than one split time can be stored). 1. It is possible to subtract the previous split time from a certain split time in the storage circuit using the 26 arithmetic circuits. In the case of storing all the split times and lap times in the conventional configuration, it was necessary to memorize the split times and lap times in the circuit, but with this embodiment, the split times and lap times Since it is possible to completely eliminate the lap time by storing only the time, only half the memory circuit is required compared to the conventional example.

As described above, according to the present invention, there is no need for an elbow number circuit for lap times, and the load on the circuit is extremely reduced.Furthermore, the burden on the memory circuit for storing split times and lap times is also reduced. It has many great features such as being halved.

4. Brief explanation of the drawings Fig. 1 OX A conventional Yushisha stopwatch that can display the conventional split time and lap time.

Figures 2 and 3 show an example of an electronic stopwatch using the invention.

that's all Applicant: Suwa Seikosha Co., Ltd. Agent: Patent Attorney Mogami

Claims (1)

[Claims] (1) At least the reference multiplier 9 external operating member 9 oscillates the reference code source, the oscillation frequency dividing circuit that completely divides the signal, and the human power Vc of the external operating member! A control circuit that supplies all the 100 numbers necessary for each part, a counting circuit for a stopwatch that resists the signal of the oscillation frequency dividing circuit, a memory circuit that stores the value of the counting circuit as a split time, and a memory circuit that stores the value of the counting circuit as a split time. This electronic stopwatch is comprised of an arithmetic circuit that calculates lap times, a display circuit, a display device, and a power supply device.