US4855781A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Camera with battery check circuit
Assignee: Konica Minolta Inc
•
Filing: 1988-02-04
•
Granted: 1989-08-08
•
Expires: 2008-02-04
Abstract
Abstract A camera includes an LCD, a microcomputer for detecting the presence/absence of a main power supply battery so as to detect an exchange of the main power supply battery, and a battery check circuit for detecting a voltage state of the main power supply battery. When the microcomputer detects the exchange of the main power supply battery, the battery check circuit is started to cause the LCD to display the voltage state of the main power supply battery.
Inventors
- 👤 Yasushi Hoshino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:52
CPC Classifications
G; G01; G01R; G01R19/00; G01R19/165; G01R19/16533; G01R19/16538; G01R19/16542; G01R31/00; G01R31/36; G01R31/3644; G01R31/3646; G01R31/3648; G03; G03B; G03B7/00; G03B7/26
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
142 words
A camera battery check circuit, comprising: first detection means for detecting the presence or absence of a main power supply battery at first predetermined intervals and generating first and second signals in response to the detection of the presence or absence, respectively, of the main power supply battery; second detection means for detecting the voltage level of said main power supply battery in response to said first signal and thereafter detecting said voltage state at second predetermined intervals, said second predetermined intervals being longer than said first predetermined intervals; display means for displaying the voltage level of said main power supply battery and for indicating the presence or absence of said main power supply battery in response to said first and second signals, respectively; and a sub power supply battery for supplying power to said display means and said first detection means.
Claim 2
Dependent Claim
142 words
A camera battery check circuit, comprising: first detection means for detecting the presence or absence of a main power supply battery at first predetermined intervals and generating first and second signals in response to the detection of the presence or absence, respectively, of the main power supply battery; second detection means for detecting the voltage level of said main power supply battery in response to said first signal and thereafter detecting said voltage state at second predetermined intervals, said second predetermined intervals being longer than said first predetermined intervals; display means for displaying the voltage level of said main power supply battery and for indicating the presence or absence of said main power supply battery in response to said first and second signals, respectively; and a sub power supply battery for supplying power to said display means and said first detection means.
Claim 3
Dependent Claim
43 words
A battery circuit according to claim 1, further including a release button, for generating an enabling signal when the release button is operated, said second detection means detecting said voltage level of said main power supply battery in response to said enabling signal.
Claim 4
Dependent Claim
58 words
A battery check circuit according to claim 1, further comprising means for establishing a threshold voltage, wherein said first detection means generates said first signal when the voltage of said main power supply battery exceeds said threshold voltage and generates said second signal when the voltage of said main power supply battery is less than said threshold voltage.
Claim 5
Dependent Claim
26 words
A battery check circuit according to claim 1, wherein the first predetermined interval is about one second and said second predetermined interval is about 24 hours.
References Cited (Backward Citations)
US4269494A
Cited
JPS5846332A
Cited
US4525055A
Cited
JPS6048025A
Cited
US4716433A
Cited
US4662736A
Cited
US4751546A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-08-07 | 1993-02-06 | 1993-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-07 | 1997-02-06 | 1997-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-07 | 2001-02-06 | 2001-08-08 | $7700.00 | Window Closed / Lapsed |