Battery check device

• US 4,389,609 A
• Filed: 11/25/1981
• Issued: 06/21/1983
• Est. Priority Date: 12/03/1980
• Status: Expired due to Term

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Kawamura, Masaharu
• Primary Examiner(s): Shoop, William M.
• Assistant Examiner(s): Ault, Anita M.
• Application Number:
  US06/324,808
• Time in Patent Office: 573 Days
• Field of Search: 320/43, 320/48, 340/636
• US Class Current: 340/636.12
• CPC Class Codes: G01R 19/16542 for batteries charge condition monitoring in G01R31/36
• CPC Class Codes: Y10S 320/21 State of charge of battery

Abstract

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.

Claims

1. A battery check device comprising:

(a) display means, said means including a first and a second terminal for carrying out a display with colors in accordance with the level of the signals delivered to the respective terminals;

(b) first signal forming means for decreasing the output signal in accordance with the decrease of the power source voltage, the output signal of said means being delivered to the first terminal of the display means; and

(c) second signal forming means for increasing the output signal in accordance with the decrease of the power source voltage, the output signal of said means being delivered to the second terminal of the display means;

whereby the display means carries out the display with colors corresponding to the state of the power source voltage in accordance with the output signals from the first and the second signal forming means.

2. A battery check device in accordance with claim 1, wherein the display means emit the light of the first color with the level corresponding to the signal delivered to the first terminal and the light of the second color with the level corresponding to the signal delivered to the second terminal, whereby the display is carried out with the sum of the first color level and the second color level.

3. A battery check device comprising:

(a) display means, said means including a first and a second terminal carrying out the display with colors corresponding to the value of the current delivered to the respective terminals; and

(b) a current control circuit for delivering the output current corresponding to the power source voltage, said circuit including first means for decreasing the output current in accordance with the decrease of the power source voltage and second means for increasing the output current in accordance with the decrease of the power source voltage;

whereby the output current from the first means is delivered to the first terminal and the output current from the second means is delivered to the second terminal carrying out the display with the color in accordance with the state of the power source voltage.

4. A battery check device comprising:

(a) display means, said means including a first and a second terminal carrying out the display with the color corresponding to the amount of the signals delivered to the respective terminals per unit time;

(b) first signal forming means for decreasing the amount of the output signal in accordance with the decrease of the power source voltage, the output signal from said means being delivered to the first terminal of the display means; and

(c) second signal forming means for increasing the amount of the output signal in accordance with the decrease of the power source voltage, the output signal from said means being delivered to the first terminal of the display means;

whereby the display means carries out the display with the color corresponding to the state of the power source voltage in accordance with the amount of the output signals from the first and the second signal forming means.

5. A battery check device comprising:

(a) display means, said means including a first and a second terminal for carrying out the display with the color corresponding to the duty cycle of the pulses delivered to the respective terminals;

(b) first pulse means for decreasing the duty cycle of the pulses in accordance with the decrease of the power source voltage, the pulses from said means being delivered to the first terminal of the display means; and

(c) second pulse means for increasing the duty cycle of the pulses in accordance with the decrease of the power source voltage, the pulses from said means being delivered to the second terminal of the display means;

whereby the display means carries out the display with the color corresponding to the state of the power source voltage in accordance with the pulses from the first and the second pulse means.