US4989093A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Camera automatically operable in a flash photographic mode for providing color-balanced images
Assignee: Fujifilm Corp
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Filing: 1989-01-24
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Granted: 1991-01-29
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Expires: 2009-01-24
Abstract
Abstract A camera changeable between an ordinary photographic mode and a flash photographic mode includes a light source identifying device for identifying the illumination light provided from a fluorescent lamp based on an output from a light measuring device. The light source identifying device is detects ripple components of the output from the light measuring device to provide a flash control signal if the detected ripple components are higher than a predetermined level. The camera is changed into a flash photographic mode in response to the presence of the flash control signal in spite of the brightness of the subject field.
Inventors
- 👤 Kiyotaka Kaneko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:44
CPC Classifications
H; H04; H04N; H04N23/00; H04N23/80; H04N23/84; H04N23/88
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
75 words
A camera changeable to a flash photographic mode, comprising: photoelectric means for detecting light from a subject field to provide a photoelectric output proportional to the quantity of said light detected therefrom; means for deciding if said light detected by said photoelectric means is fluorescent light based on said photoelectric output to provide a signal; and means for automatically changing said camera to said flash photographic mode in response to the presence of said signal.
Claim 2
Dependent Claim
75 words
A camera changeable to a flash photographic mode, comprising: photoelectric means for detecting light from a subject field to provide a photoelectric output proportional to the quantity of said light detected therefrom; means for deciding if said light detected by said photoelectric means is fluorescent light based on said photoelectric output to provide a signal; and means for automatically changing said camera to said flash photographic mode in response to the presence of said signal.
Claim 3
Dependent Claim
43 words
A camera as defined in claim 1, wherein said camera has an image sensor disposed in a focal plane of a taking lens of said camera for providing image signals of an image focused thereon of three primary colors, blue, green and red.
Claim 4
Dependent Claim
27 words
A camera as defined in claim 2, further comprising amplifiers for respectively amplifying said blue and red image signals to be recorded by an electronic recording means.
Claim 5
Dependent Claim
48 words
A camera as defined in claim 3, further comprising color temperature detecting means for providing control signals representive of blue and red color temperatures of said light detected by said photoelectric means to control said amplifiers to change their gain according to said blue and red color temperature.
Claim 6
Dependent Claim
37 words
A camera as defined in claim 4, wherein said means for deciding is a ripple detecting means for detecting ripple components contained in said photoelectric output which are larger than a predetermined level indicative of fluorescent light.
Claim 7
Dependent Claim
34 words
A camera as defined in claim 5, wherein said ripple detecting means controls said color temperature detecting means to disregard said photoelectric outputs and to provide a predetermined level of a specific color temperature.
Claim 8
Dependent Claim
17 words
A camera as defined in claim 6, wherein said specific color temperature is approximately 5,500 degrees K.
Claim 9
Dependent Claim
86 words
A camera changeable between a natural light photographic mode and a flash light photographic mode, comprising: photoelectric means for detecting light from a subject field to provide a photoelectric output proportional to the quantity of said light detected therefrom; ripple detecting means for detecting ripple components contained in said photoelectric output which are larger than a predetermined level to provide a control signal; and mode changing means for automatically changing said camera to said flash photographic mode in response to the presence of said control signal.
Claim 10
Dependent Claim
86 words
A camera changeable between a natural light photographic mode and a flash light photographic mode, comprising: photoelectric means for detecting light from a subject field to provide a photoelectric output proportional to the quantity of said light detected therefrom; ripple detecting means for detecting ripple components contained in said photoelectric output which are larger than a predetermined level to provide a control signal; and mode changing means for automatically changing said camera to said flash photographic mode in response to the presence of said control signal.
Claim 11
Dependent Claim
34 words
A camera as defined in claim 8, wherein said mode changing means includes an automatic exposure control means for automatically controlling an exposure means including at least a shutter and electronic flash triggering means.
Claim 12
Dependent Claim
26 words
A camera as defined in claim 9, wherein said automatic exposure control means is changeable between said natural light photographic mode and said flash photographic mode.
Claim 13
Dependent Claim
29 words
A camera as defined in claim 10, wherein said automatic exposure control means is changed to said flash photographic mode in response to the presence of said control signal.
Claim 14
Dependent Claim
27 words
A camera as defined in claim 10, wherein said exposure control means is changed to said natural light photographic mode in the absence of said control signal.
Claim 15
Dependent Claim
48 words
A camera as defined in any one of claims 8 to 12, wherein said camera has an image sensor disposed in a focal plane of a taking lens of said camera for providing image signals of an image focused thereon of three primary colors, blue, green and red.
Claim 16
Dependent Claim
27 words
A camera as defined in claim 13, further comprising amplifiers for respectively amplifying said blue and red image signals to be recorded by an electronic recording means.
Claim 17
Dependent Claim
48 words
A camera as defined in claim 14, further comprising color temperature detecting means for providing control signals representative of blue and red color temperatures of said light detected by said photoelectric means to control said amplifiers to change their gain according to said blue and red color temperatures.
Claim 18
Dependent Claim
41 words
A camera as defined in claim 15, wherein said ripple detecting means controls said color temperature detecting means to disregard said photoelectric outputs and to provide a predetermined level of control signal which is equivalently representive of a specific color temperature.
Claim 19
Dependent Claim
17 words
A camera as defined in claim 16, wherein said specific color temperature is approximately 5,500 degrees K.
Claim 20
Independent Claim
82 words
A method of changing a camera to a flash photographic mode, comprising the steps of: detecting light from a subject field with a photoelectric means to provide a photoelectric output proportional to the quantity of said light detected therefrom; deciding, in a decision means, if said light detected by said photoelectric means is fluorescent light based on said photoelectric output to provide a signal; and automatically changing said camera to said flash photographic mode in response to the presence of said signal.
Claim 21
Independent Claim
82 words
A method of changing a camera to a flash photographic mode, comprising the steps of: detecting light from a subject field with a photoelectric means to provide a photoelectric output proportional to the quantity of said light detected therefrom; deciding, in a decision means, if said light detected by said photoelectric means is fluorescent light based on said photoelectric output to provide a signal; and automatically changing said camera to said flash photographic mode in response to the presence of said signal.
Claim 22
Independent Claim
87 words
A method of changing a camera between a natural light photographic mode and a flash light photographic mode, comprising: detecting light from a subject field with a photoelectric means to provide a photoelectric output proportional to the quantity of said light detected therefrom; detecting ripple components contained in said photoelectric output, in a ripple detecting means, which are larger than a predetermined level to provide a control signal; and automatically changing said camera to said flash photographic mode in response to the presence of said control signal.
Claim 23
Independent Claim
87 words
A method of changing a camera between a natural light photographic mode and a flash light photographic mode, comprising: detecting light from a subject field with a photoelectric means to provide a photoelectric output proportional to the quantity of said light detected therefrom; detecting ripple components contained in said photoelectric output, in a ripple detecting means, which are larger than a predetermined level to provide a control signal; and automatically changing said camera to said flash photographic mode in response to the presence of said control signal.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-01-28 | 1994-07-30 | 1995-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-01-28 | 1998-07-30 | 1999-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-01-28 | 2002-07-30 | 2003-01-29 | $7700.00 | Window Closed / Lapsed |