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Patent US4163935A successfully refreshed from Google Patents.
US4163935A
Expired / Lapsed
US
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Apparatus for checking a battery voltage
Assignee: Canon Inc
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Filing: 1978-02-17
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Granted: 1979-08-07
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Expires: 1998-02-17
Abstract
Abstract An apparatus for checking the voltage of a power source battery in a photographic camera is disclosed. In simple form, this apparatus comprises first and second series circuits connected in parallel with each other to the battery, the first one of which has a luminous diode and a resistor, and the second one of which has two luminous diodes and a resistor, the characteristics of the luminous diodes and resistors being so selected that, when the actual voltage is dropped from a predetermined level, a difference between the brightnesses of the luminous diodes of the first and second circuits results to apprise the camera operator of the drop in battery voltage.
Inventors
- 👤 Nobuaki Sakurada
- 👤 Yukio Mashimo
- 👤 Tadashi Ito
- 👤 Fumio Ito
- 👤 Nobuhiko Shinoda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:20
CPC Classifications
G; G03; G03B; G03B43/00; G01; G01R; G01R19/00; G01R19/165; G01R19/16533; G01R19/16538; G01R19/16542; G01R31/00; G01R31/36; G01R31/3644; G01R31/3646; G01R31/3648; G01R31/382; G01R31/3835
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
180 words
An apparatus for checking the driving voltage of a battery in a digital display device comprising: (a) a digital display device including in addition to the battery whose output voltage is to be checked: (1) a first means for producing a control signal corresponding to a normal pattern to be displayed; (2) a plurality of series circuits connected in parallel with one another to said battery, each circuit having at least one light emitting diode which forms at least one part of said normal pattern and also having a driving means which controls illumination of the light emitting diode in response to the control signal from said first means; and (b) diode means connected in series between at least one of said light emitting diodes and said driving means for controlling the illumination of the light emitting diode provided in said circuit so as to assure that the output of said battery, when its terminal voltage is below a predetermined value, makes the pattern into a special symbol different from the normal pattern provided in accordance with the control signal.
Claim 2
Independent Claim
180 words
An apparatus for checking the driving voltage of a battery in a digital display device comprising: (a) a digital display device including in addition to the battery whose output voltage is to be checked: (1) a first means for producing a control signal corresponding to a normal pattern to be displayed; (2) a plurality of series circuits connected in parallel with one another to said battery, each circuit having at least one light emitting diode which forms at least one part of said normal pattern and also having a driving means which controls illumination of the light emitting diode in response to the control signal from said first means; and (b) diode means connected in series between at least one of said light emitting diodes and said driving means for controlling the illumination of the light emitting diode provided in said circuit so as to assure that the output of said battery, when its terminal voltage is below a predetermined value, makes the pattern into a special symbol different from the normal pattern provided in accordance with the control signal.
Claim 3
Independent Claim
182 words
An apparatus for checking the driving voltage of a battery in a digital display device comprising: (a) a digital display device including in addition to the battery whose output voltage is to be checked: (1) a first means for producing a control signal corresponding to a normal pattern to be displayed; (2) a plurality of series circuits connected in parallel with one another to said battery, each circuit having at least one light emitting diode which forms at least one part of said normal pattern and also having a driving means which controls illumination of the light emitting diode in response to the control signal from said first means; and (b) light emitting diode means connected in series between at least one of said light emitting diodes and said driving means for controlling the illumination of the light emitting diode provided in said circuit so as to assure that the output of said battery, when its terminal voltage is below a predetermined value, makes the pattern into a special symbol different from the normal pattern provided in accordance with the control signal.
Claim 4
Independent Claim
182 words
An apparatus for checking the driving voltage of a battery in a digital display device comprising: (a) a digital display device including in addition to the battery whose output voltage is to be checked: (1) a first means for producing a control signal corresponding to a normal pattern to be displayed; (2) a plurality of series circuits connected in parallel with one another to said battery, each circuit having at least one light emitting diode which forms at least one part of said normal pattern and also having a driving means which controls illumination of the light emitting diode in response to the control signal from said first means; and (b) light emitting diode means connected in series between at least one of said light emitting diodes and said driving means for controlling the illumination of the light emitting diode provided in said circuit so as to assure that the output of said battery, when its terminal voltage is below a predetermined value, makes the pattern into a special symbol different from the normal pattern provided in accordance with the control signal.
Claim 5
Dependent Claim
24 words
An apparatus according to claim 2, wherein said diode means includes a semiconductor switching means having an output terminal connected to said diode means.
Claim 6
Dependent Claim
15 words
An apparatus according to claim 3, wherein said semiconductor switching means consists of a transistor.
Claim 7
Dependent Claim
19 words
An apparatus according to claim 4, wherein the transistor of said semiconductor switching means consists of an npn transistor.
Claim 8
Dependent Claim
15 words
An apparatus according to claim 2, wherein said plurality of circuits comprises seven said circuits.
Claim 9
Independent Claim
156 words
An apparatus for checking the output voltage of a battery in a digital display device comprising: (a) register means for storing a control signal corresponding to a normal pattern to be displayed; (b) decoder means connected to said register means; (c) a plurality of series circuits connected in parallel with one another to the battery, each circuit having at least one light emitting diode which forms a part of said normal pattern and the light emitting diode of each circuit being controlled by a signal from said decoder means; and (d) diode means connected in series with at least one of said light emitting diodes for controlling the illumination of the light emitting diode provided in said circuit so as to assure that the output of the battery, when its terminal voltage is below a predetermined value, makes the pattern into a special symbol different from the normal pattern provided in accordance with the control signal.
Claim 10
Independent Claim
156 words
An apparatus for checking the output voltage of a battery in a digital display device comprising: (a) register means for storing a control signal corresponding to a normal pattern to be displayed; (b) decoder means connected to said register means; (c) a plurality of series circuits connected in parallel with one another to the battery, each circuit having at least one light emitting diode which forms a part of said normal pattern and the light emitting diode of each circuit being controlled by a signal from said decoder means; and (d) diode means connected in series with at least one of said light emitting diodes for controlling the illumination of the light emitting diode provided in said circuit so as to assure that the output of the battery, when its terminal voltage is below a predetermined value, makes the pattern into a special symbol different from the normal pattern provided in accordance with the control signal.
References Cited (Backward Citations)
US3534354A
Cited
US3755806A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-08-06 | 1983-02-05 | 1983-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-08-06 | 1987-02-05 | 1987-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-08-06 | 1991-02-05 | 1991-08-07 | $7700.00 | Window Closed / Lapsed |