US4914469A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power supply system for a camera
Assignee: Minolta Co Ltd
•
Filing: 1989-05-15
•
Granted: 1990-04-03
•
Expires: 2009-05-15
Abstract
Abstract A power supply system for a camera supplies electrical power to a light measuring circuit, a display circuit and others. During a hold state before the camera turns into a standby state, the power supply system supplies a boosted electrical power intermittently to the light measuring circuit, the display circuit and others, so that photographic information such as shutter speed and aperture value based on the measurement of the light measuring circuit are displayed on a display and power consumption in the hold state can be made small.
Inventors
- 👤 Toshihiko Ishimura
- 👤 Reiji Seki
- 👤 Hirokazu Kuroda
- 👤 Shuji Izumi
- 👤 Akira Okuno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:36
CPC Classifications
G; G03; G03B; G03B7/00; G03B7/26
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
95 words
An electrical power supply system in a camera having an electrical circuit, comprising: (a) a power source; (b) power supply means for supplying electrical power of said power source to said electrical circuit; (c) switching means having a first state and a second state and arranged to be operable manually; and (d) control means for controlling said power supply means to supply the electrical power continuously to said electrical circuit when said switching means is in the first state and to supply the electrical power intermittently when said switching means is in the second state.
Claim 2
Dependent Claim
95 words
An electrical power supply system in a camera having an electrical circuit, comprising: (a) a power source; (b) power supply means for supplying electrical power of said power source to said electrical circuit; (c) switching means having a first state and a second state and arranged to be operable manually; and (d) control means for controlling said power supply means to supply the electrical power continuously to said electrical circuit when said switching means is in the first state and to supply the electrical power intermittently when said switching means is in the second state.
Claim 3
Dependent Claim
64 words
An electrical power supply system as claimed in claim 1, further comprising: (e) timer means for counting a predetermined period in response to the fact that a state of said switching means changes into the second state from the first state; wherein said control means controls said power supply means to supply the electrical power intermittently to the electrical circuit during the predetermined period.
Claim 4
Dependent Claim
34 words
An electrical power supply system as claimed in claim 2, wherein said control means stops said power supply means supplying the electrical power to said electrical circuit after a lapse of the predetermined period.
Claim 5
Dependent Claim
37 words
An electrical power supply system as claimed in claim 3, wherein said power source is a battery and said power supply means is a DC/DC converter which converts a voltage of said battery into a predetermined voltage.
Claim 6
Dependent Claim
19 words
An electrical power supply system as claimed in claim 3, wherein said electrical circuit is a light measuring circuit.
Claim 7
Dependent Claim
107 words
An electrical power supply system in a camera having an electrical circuit, comprising: (a) a power source (b) power supply means for supplying electrical power of said power source to said electrical circuit; (c) switching means having a first state and a second state and arranged to be operable manually; and (d) control means for controlling said power supply means to supply the electrical power continuously to said electrical circuit when said switching means is in the first state and to supply the electrical power intermittently in response to the fact that a state of said switching means changes into the second state from the first state.
Claim 8
Dependent Claim
107 words
An electrical power supply system in a camera having an electrical circuit, comprising: (a) a power source (b) power supply means for supplying electrical power of said power source to said electrical circuit; (c) switching means having a first state and a second state and arranged to be operable manually; and (d) control means for controlling said power supply means to supply the electrical power continuously to said electrical circuit when said switching means is in the first state and to supply the electrical power intermittently in response to the fact that a state of said switching means changes into the second state from the first state.
References Cited (Backward Citations)
US4126874A
Cited
US4522480A
Cited
US4429974A
Cited
US4553140A
Cited
JPS6078431A
Cited
JPS6078430A
Cited
JPS6078429A
Cited
US4636056A
Cited
JPS60140326A
Cited
US4645326A
Cited
US4724456A
Cited
US4855781A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-04-02 | 1993-10-02 | 1994-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-04-02 | 1997-10-02 | 1998-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-04-02 | 2001-10-02 | 2002-04-03 | $7700.00 | Window Closed / Lapsed |