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Battery-check-device

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Battery check device

Details

Inventors: Kawamura, Masaharu;
Assignee: Canon Kabushiki Kaisha (Tokyo, JP)
Primary Examiner: Shoop; William M.
Assistant Examiner: Ault; Anita M.
Attorney, Agent or Firm: Toren, McGeady and Stanger

The present invention relates to a battery check device particularly for displaying the state of the power source voltage with color. Until now, the battery checker for displaying the state of the power source voltage with color is provided with a plural number of color light emitting elements so as to display the state of the power source voltage with color by selectively driving the determined display element in accordance with the state of the power source voltage. However, by means of this conventional method, the state of the power source voltage can not be displayed continuously, which is inconvenient. In order to eliminate the above shortcoming, the present invention provides a battery checker for continuously displaying the change of the level of the power source voltage with color by continuously changing the color of the display means in accordance with the signal level corresponding to the state of the power source voltage.

DETAILED DESCRIPTION In order to eliminate the shortcomings of the conventional device, an object of the present invention is to provide a battery check device so designed that a current corresponding to the state of the power source voltage is applied to a light emitting display element having a first and a second terminal in such a manner that color light are emitted in accordance to the value of the currents delivered to respective terminals.
In this manner, the continuous change of the state of the power source voltage is displayed with the continuous change of the emitted color light, which is convenient and disadvantageous for the photographer to recognize the state of the power source voltage.
Another object of the present invention is to provide a battery check device so designed that a first and a second terminal are provided, while a light emitting display means emitting the color light in accordance to the level of the signals delivered to the respective terminals, a first signal forming means for decreasing the output signal in accordance with the decrease of the power source voltage and a second signal forming means for increasing the output signal in accordance with the decrease of the power source voltage are provided.
In this manner, the output signal from the first signal forming means is delivered to the first terminal, while the output signal from the second signal forming means is delivered to the second terminal in such a manner that the color light display is carried out in accordance with the change of the state of the power source voltage.
Further, another object of the present invention is to provide a battery check device so designed that the first and the second signal forming means are constituted of the current regulating means in such a manner that the currents with the values corresponding to the state of the power source voltage are delivered to the respective terminals in order to continuously display the change of the state of the power source voltage with the change of the color light

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