Battery level warning device
First Claim
1. An electronic system for driving display means and a load means comprising:
- a battery;
a battery check circuit for detecting the drop of the power-supply voltage from said battery to a comparatively low value above the lower limit of the operation voltage of said electronic system and for detecting the drop of said power-supply voltage from said battery to said lower limit;
a sequence control circuit coupled to the electronic system and controlled by a first and a second switch and by the output of said battery check circuit; and
a power switching means connected between said battery and said battery check circuit,wherein said first switch is set to the ON condition so as to start a first operation of said electronic system, wherein said second switch is thereafter set to the ON condition so as to start a second operation of said electronic system, wherein said power switching means is set to the ON condition by the ON condition of said first switch so that said battery check circuit is supplied with said power-supply voltage from said battery and said battery check circuit starts to detect said power-supply voltage, wherein said display means is controlled by said battery check circuit and said sequence control circuit to indicate internal information of said electronic system and battery-level warning information during said first operation of said electronic system based on the ON condition of said first switch when said power-supply voltage through said power switching means is lower than said comparatively low value, wherein said internal information is inherently derived by the function of said electronic system when the power supply voltage is higher than said lower limit, wherein said load means is driven by said electronic system in said second operation of said electronic system based upon the ON condition of said second switch when said power-supply voltage is higher than said lower limit, and wherein said battery check circuit prohibits said sequence control circuit from starting the second operation of said electronic system when said power-supply voltage from said power switching means is lower than said lower limit.
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Accused Products
Abstract
Battery voltage level warning is made according to the output signals of two detecting circuits. A first detecting circuit detects the power supply voltage having lowered to a value somewhat above the lower limit of the operation power supply voltage of an electronic system. The output thereof supplies weak battery warning. The second detecting circuit detects the power supply voltage having lowered to the lower limit level of said operation power-supply voltage. The output thereof prohibits the operation of said electronic system. Thereby, desirable battery-replacement times becomes clarified and the malfunction of said electronic system is prevented.
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Citations
12 Claims
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1. An electronic system for driving display means and a load means comprising:
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a battery; a battery check circuit for detecting the drop of the power-supply voltage from said battery to a comparatively low value above the lower limit of the operation voltage of said electronic system and for detecting the drop of said power-supply voltage from said battery to said lower limit; a sequence control circuit coupled to the electronic system and controlled by a first and a second switch and by the output of said battery check circuit; and a power switching means connected between said battery and said battery check circuit, wherein said first switch is set to the ON condition so as to start a first operation of said electronic system, wherein said second switch is thereafter set to the ON condition so as to start a second operation of said electronic system, wherein said power switching means is set to the ON condition by the ON condition of said first switch so that said battery check circuit is supplied with said power-supply voltage from said battery and said battery check circuit starts to detect said power-supply voltage, wherein said display means is controlled by said battery check circuit and said sequence control circuit to indicate internal information of said electronic system and battery-level warning information during said first operation of said electronic system based on the ON condition of said first switch when said power-supply voltage through said power switching means is lower than said comparatively low value, wherein said internal information is inherently derived by the function of said electronic system when the power supply voltage is higher than said lower limit, wherein said load means is driven by said electronic system in said second operation of said electronic system based upon the ON condition of said second switch when said power-supply voltage is higher than said lower limit, and wherein said battery check circuit prohibits said sequence control circuit from starting the second operation of said electronic system when said power-supply voltage from said power switching means is lower than said lower limit. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An electronic camera comprising:
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a battery; a first and a second release switch respectively interlocked with a release button of said electronic camera and successively set to the ON conditions by the depressing of said release button; a shutter mechanism; display means; an electronic system which includes a photo sensing circuit, an arithmetic unit for computing optimum information for obtaining a proper photograph based upon the output of said photo sensing circuit, wherein said display means indicates information based upon said optimum information output of said arithmetic unit; a battery check circuit for detecting the drop of the power supply voltage from said battery to a comparatively low value above the lower limit of the operation voltage of said electronic system and for detecting the drop of said power supply voltage from said battery to said lower limit; a control circuit coupled to said electronic system which is controlled by said battery check circuit and by said first and said second release switch; and a power switching means connected between said battery and said battery check circuit, wherein said power switching means is set to the ON condition by the ON condition of said first release switch so that said battery check circuit is supplied with a power-supply voltage from said battery and said battery check circuit starts to detect said power-supply voltage, wherein said display means are controlled by said battery check circuit and said control circuit so as to indicate said information based upon said optimum information and battery-level warning information during the ON condition of said first release switch when said power-supply voltage from said power switch means is lower than said comparatively low value, wherein said shutter mechanism is controlled by said control circuit so as to commence the photographic operation based upon the ON condition of said second release switch, and wherein said battery check circuit prohibits said control circuit from starting the operation of said electronic system when said power-supply voltage from said power switching means is lower than said lower limit. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification