Horology: time measuring systems or devices – Displays or display device details – With luminous material
Patent
1990-06-21
1991-02-12
Miska, Vit W.
Horology: time measuring systems or devices
Displays or display device details
With luminous material
368238, G04B 1932
Patent
active
049930052
ABSTRACT:
A power supply system for luminous hands wherein an hour and a minute hand have electroluminescence elements and a second hand has a light-emitting diode. The power supply system comprises a drive signal generator for generating a mixed signal consisting of a high-frequency signal and a low-frequency signal. An hour hand brush conductor between a fixed member and the hour hand receives the mixed signal. An hour hand filter passes only the low-frequency signal and sends it to the electroluminescence element of the hour hand. A minute hand brush conductor device placed between the hour hand and the minute hand receives the mixed signal from said hour hand brush conductor device. A minute hand filter passes only the low-frequency signal of the mixed signal and sends the low-frequency signal to the electroluminescence element of the minute hand. A rotary transformer between the minute hand and the second hand transfers the mixed signal from the minute hand brush conductor device to the light-emitting diode of the second hand. When the second hand alternatively has an electro-luminescence element, a converter is provided to convert the high-frequency signal to a low-frequency signal and send this low-frequency signal to the electroluminescence element of the second hand.
REFERENCES:
patent: 2655783 (1953-10-01), Uschkamp
patent: 3079748 (1963-03-01), Hultquist
Miska Vit W.
Seikosha Co. Ltd.
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