Horology: time measuring systems or devices – Combined with disparate device
Reexamination Certificate
2000-03-01
2001-06-26
Miska, Vit (Department: 2859)
Horology: time measuring systems or devices
Combined with disparate device
C368S011000, C368S014000
Reexamination Certificate
active
06252824
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an electronic timepiece, such as a wrist watch, with a bearing detector and, more particularly, to an electronic watch with a bearing detector for performing of starting and ending operations bearing measurement.
2. Description of the Prior Art
A conventional electronic wrist watch with a bearing detector, as shown, for example comprise by a block diagram in
FIG. 7
, comprise a microprocessor (CPU)
10
, a memory (ROM)
11
for storing a system program, processing program and the like for the CPU
10
, a memory (RAM)
12
for storing processing data and the like, an oscillation circuit
13
for providing a clock signal to the CPU
10
, a display circuit
14
driven by the CPU
10
for performing time display, bearing measurement value display and the like, a bearing detection circuit
15
controlled by the CPU
10
for performing bearing measurement, a frequency-dividing circuit
16
for frequency-dividing an oscillation frequency of the oscillation circuit
13
and generating a 1-Hz timing signal, a push button
17
for starting bearing measurement and an interrupt circuit
18
.
Although the electronic wrist watch with a bearing detector is usually utilized by wearing on the arm, a wearer has been required to press a measurement push button
17
when starting bearing measurement. The wearer fully understands that measurement with the electronic wrist watch with a bearing detector positioned in a horizontal state is suited for bearing measurement. However, there are often cases that the push button
17
is pressed in a state that the electronic wrist watch with an bearing detector is not horizontal but inclined. If bearing measurement is made by the electronic wrist watch with a bearing detector in such an inclined state, there is a problem that the measurement accuracy is decreased.
The problem that the present invention is to solve is to improve bearing measurement accuracy by automatically starting bearing measurement when an electronic wrist watch with a bearing detector becomes is positioned a horizontal state.
SUMMARY OF THE INVENTION
In order to solve the above problem in the conventional art, an electronic watch with a bearing detector comprises a microprocessor, a memory for storing a processing program, processing data and the like for the microprocessor, an oscillation circuit for providing a clock signal to the microprocessor, a display circuit driven by the microprocessor to perform time display, bearing measurement value display and the like, and a bearing detection circuit controlled by the microprocessor to perform bearing measurement, wherein when a horizontal detection circuit detects a horizontal state of the electronic wrist watch with a bearing detector, bearing measurement and bearing measurement value display are performed.
According to the present invention, bearing measurement is started by detecting a horizontal state of the electronic wrist watch with a bearing detector relative to a ground reference by the horizontal detection circuit and is continued until a measurement stop signal is inputted. Further, the measurement stop signal can be inputted manually by pressing a push button or automatically after counted a predetermined time period counted by a timer has elapsed.
REFERENCES:
patent: 4337530 (1982-06-01), Toft
patent: 4482255 (1984-11-01), Gygax et al.
patent: 5175936 (1993-01-01), Sato
patent: 5216816 (1993-06-01), Ida
patent: 5600611 (1997-02-01), Kamens
patent: 5883861 (1999-03-01), Moser et al.
Adams & Wilks
Miska Vit
Seiko Instruments Inc.
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