Horology: time measuring systems or devices – Controlled by a disparate device – Electrical device
Patent
1994-08-29
1996-03-19
Roskoski, Bernard
Horology: time measuring systems or devices
Controlled by a disparate device
Electrical device
368121, 368118, 368 89, 368107, G04F 800
Patent
active
055008348
ABSTRACT:
While the electric power source is turned on, capacitor 1 is charged to a voltage EO by a direct current constant voltage supplier through transistor 4. When the electric power is disconnected, transistor 4 is switched off to discharge capacitor 1 through resistor R1. When the power source is turned on, the voltage of capacitor 1 is read by A/D converter to be produced and stored in CPU 12 memory. Then transistor 4 is switched on to charge capacitor 1 to the voltage EO. Then transistor 4 is switched off and transistor 5 is switched on to discharge capacitor 1 through resistor R2 and a counter stars. When the voltage of capacitor 1 reduces to the same voltage stored in the memory, transistor 5 is switched off to stop the counter and to obtain the counted value t2. Then transistor 4 is switched on to prepare for the next operation. The time lapse t1 after the power source being turned off is obtained by a formula (R1/R2).times.t2.
REFERENCES:
patent: 3490890 (1974-02-01), Doittau et al.
patent: 3581196 (1974-05-01), Spaid
patent: 3854281 (1974-12-01), Reichert
patent: 4879647 (1989-11-01), Yazawa
Ogasawara Yoshimi
Sakaki Eihiro
Teshima Eiichiro
Canon Kabushiki Kaisha
Roskoski Bernard
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