Claims
- 1. A white balance adjusting device for use in a camera having at least a single photographic mode in which, when a shutter release operation is performed, an image of a field is picked up by a single frame and a video signal representing the still image thereof is formed and a sequential photographic mode in which, while said shutter release operation is being performed, the images of said field are picked up sequentially for every predetermined period of time and video signals respectively representing the still images thereof are formed, said white balance adjusting device comprising:
- single/sequential photographic mode setting mode setting means for setting said single photographic mode and said sequential photographic mode;
- operation means for performing said shutter release operation;
- color temperature detecting means for detecting a color temperature of said field and outputting a color temperature signal representing said color temperature; and
- control means for adjusting a white balance of said video signal in response to color temperature data that is obtained from said color temperature signal, said control means receiving a set output from said single/sequential photographic mode setting means and an output signal from said operation means and prohibiting said color temperature data that is used for adjusting said white balance from being updated when a sequential photographic operation is being performed.
- 2. A white balance adjusting device for use in a camera as set forth in claim 1, wherein said color temperature detecting means comprises:
- a color temperature detection element for outputting a first photocurrent signal corresponding to an R component of an incident light from said field and a second photocurrent signal corresponding to a B component of said incident light;
- a logarithmic conversion circuit for receiving a detection output from said color temperature detection element, compressing said detection output logarithmically and outputting an R signal and a B signal respectively corresponding to said R and B components of said incident light;
- a subtraction circuit for calculating a difference between said R and B signals output from said logarithmic conversion circuit; and
- an amplifier for amplifying a subtraction output signal from said subtraction circuit up to a predetermined level.
- 3. A white balance adjusting device for use in a camera as set forth in claim 2, wherein said color temperature detection element comprises a first photo diode for receiving only said R component of said incident light from said field and a second photo diode for receiving only said B component of said incident light, wherein said first and second photo diodes are connected in series to each other in such a manner that the respective cathodes thereof are directly connected to each other for allowing said first and second photo diodes to have mutually opposite polarities.
- 4. A white balance adjusting device for use in a camera in which a field is photographed and a video signal representing said field is formed, said device comprising:
- photographic mode setting means for setting a still mode for photographing said field as a still image and a movie mode for photographing said field as a moving image;
- color temperature detecting means for detecting a color temperature of said field and outputting a color temperature signal representing said color temperature; and
- control means for adjusting a white balance of said video signal in response to color temperature data that is obtained from said color temperature signal, said control means receiving a set output from said photographic mode setting means and adjusting said white balance of said video signal at a shorter cycle as compared with said movie mode when said camera is set in said still mode.
- 5. A white balance adjusting device for use in a camera as set forth in claim 4, wherein said color temperature detecting means comprises;
- a color temperature detection element for outputting a first photocurrent signal corresponding to an R component of an incident light from said field and a second photo current signal corresponding to a B component of said incident light;
- a logarithmic conversion circuit for receiving a detection output from said color temperature detection element, compressing said detection output logarithmically and outputting an R signal and a B signal respectively corresponding to said R and B components of said incident light;
- a subtraction circuit for calculating a difference between said R and B signals output from said logarithmic ocnversion circuit; and
- an amplifier for amplifying a subtraction output signal of said subtraction circuit up to a predetermined level.
- 6. A white balance adjusting device for use in a camera as set forth in claim 5, wherein said color temperature detection element comprises a first photo diode for receiving only said R component of said incident light from said field and a second photo diode for receiving only said B component of said incident light, wherein said first and second photo diodes are connected in series to each other in such a manner that the respective cathodes thereof are directly connected to each other for allowing said first and second photo diodes to have mutually opposite polarities.
Priority Claims (2)
Number |
Date |
Country |
Kind |
62-214382 |
Aug 1987 |
JPX |
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62-214383 |
Aug 1987 |
JPX |
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Parent Case Info
This application is a continuation of application Ser. No. 236,992, filed on Aug. 26, 1988.
US Referenced Citations (15)
Foreign Referenced Citations (4)
Number |
Date |
Country |
55-30265 |
Mar 1980 |
JPX |
56-4993 |
Jan 1981 |
JPX |
60-254980 |
Dec 1985 |
JPX |
61-240790 |
Jan 1986 |
JPX |
Continuations (1)
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Number |
Date |
Country |
Parent |
236992 |
Aug 1988 |
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