Photography – With data recording – Optical
Patent
1997-05-21
1998-07-07
Metjahic, Safet
Photography
With data recording
Optical
396301, 396303, G03B 1724, G03B 300
Patent
active
057782660
ABSTRACT:
A data transcribing device for a camera includes structure to adjust the threshold voltage of an external display to be higher than the threshold voltage of the transcribing structure to easily check the battery voltage through the external data display and to prevent data transcription failures when the battery voltage drops. The data transcribing device includes a battery power source, a data transcribing display, and an external display powered by the battery power source. When the data transcribing display includes a light emitting source powered by the battery power source and a component other than the light emitting source that is not powered by the battery power source, or when the data transcribing display consists of only the light emitting source (such as, e.g., an LED), the driving threshold level of the external display is set to be higher than the driving threshold level of the light emitting source. When the data transcribing display includes the light emitting source and a component powered by the battery power source (such as, e.g., a transcribing LCD), the driving threshold level of the external display is set to be higher than the driving threshold levels of the component and of the light emitting source.
REFERENCES:
patent: 4074294 (1978-02-01), Fujita et al.
patent: 5119119 (1992-06-01), Amano et al.
patent: 5245373 (1993-09-01), Ogawa et al.
patent: 5382993 (1995-01-01), Hozumi et al.
patent: 5398088 (1995-03-01), Yamazaki et al.
Metjahic Safet
Nikon Corporation
Tuccillo Nicholas J.
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