Electronic watch having a water depth measuring function

Details Electronic watch having a water depth measuring function Electronic watch having a water depth measuring function

1997-06-27

1998-05-19

Dombroske, George M.

Measuring and testing

Human stress limit

12820127, 340626, 364558, G04B 4706

Patent

active

057538336

ABSTRACT:
The present invention is aimed to propose a method for minimizing erroneous shift to a water depth measurement mode by judging whether shift to a water depth measurement mode is caused by normal operation or erroneous detection and for automatically getting out of the water depth measurement mode even in the case of erroneous shift to the water depth measurement mode. Instantaneous shift to a water depth measurement mode is prevented when the water depth judging circuit 5 judges that a water depth value Ddpt from the measurement arithmetic processing circuit exceeds a predetermined value and that the water detection switch 6 detects no water contact, and a time information display mode is automatically returned even in the case of erroneous shift to a water depth measurement mode. Instantaneous shift to a water depth measurement mode is prevented when the water detection switch is on under conditions other than diving, and an original mode is automatically returned by judging the situation precisely even in the case of unexpected shift to a water depth measurement mode.

REFERENCES:
patent: 4188825 (1980-02-01), Farrar
patent: 4307449 (1981-12-01), Strubin
patent: 4658358 (1987-04-01), Leach et al.
patent: 4783722 (1988-11-01), Umemoto et al.
patent: 5031160 (1991-07-01), Koizumi et al.
patent: 5148376 (1992-09-01), Sato
patent: 5457284 (1995-10-01), Ferguson
patent: 5519671 (1996-05-01), Murakami et al.

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