Illumination detecting and recording method and device therefor
First Claim
1. A method for detecting and recording a type of illumination employed in a camera, which comprises the steps of:
- (a) receiving light from the illumination with at least two light receiving means each of which has a peak value of spectral distribution of energy in a particular wave length of the light and which particular wave lengths are distributed in different ranges from each other;
(b) comparing the intensities of received light in particular wave lengths between the two light receiving means so as to detect spectral distribution of the light emitted from the illumination;
(c) detecting a flickering noise existing in the light received by at least one of two light receiving means so as to discriminate natural light having no flickering noise therein from artificial light having flickering noise therein due to alternating voltage of a commercial power supply;
(d) producing a signal indicative of the type of light from the illumination selectively from the point of the range of the wave length thereof, and also from the point of existence of the flickering noise therein;
(e) recording a mark on a frame of a film loaded in the camera for recording the type of light from the illumination received through the produced signal.
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Accused Products
Abstract
Conventionally, color films must be used with the light source or illumination for which it was designed, such as for natural daylight, fluorescent-light or tungsten-light or, if used with another light source, a suitable conversion filter must be placed over the camera lens. However, an improvement in the emulsion of the film provide an improved type of film with which good printed images are available through a mere correction during printing of the film. The present invention provides a method and a device for detecting and recording the type of illumination through detection of their spectral properties and detection of existence of a flickering noise due to an alternating voltage of the commercial power supply, and a system for an automatic film development.
56 Citations
10 Claims
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1. A method for detecting and recording a type of illumination employed in a camera, which comprises the steps of:
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(a) receiving light from the illumination with at least two light receiving means each of which has a peak value of spectral distribution of energy in a particular wave length of the light and which particular wave lengths are distributed in different ranges from each other; (b) comparing the intensities of received light in particular wave lengths between the two light receiving means so as to detect spectral distribution of the light emitted from the illumination; (c) detecting a flickering noise existing in the light received by at least one of two light receiving means so as to discriminate natural light having no flickering noise therein from artificial light having flickering noise therein due to alternating voltage of a commercial power supply; (d) producing a signal indicative of the type of light from the illumination selectively from the point of the range of the wave length thereof, and also from the point of existence of the flickering noise therein; (e) recording a mark on a frame of a film loaded in the camera for recording the type of light from the illumination received through the produced signal.
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- 2. A method for detecting and recording the type of illumination as claimed in claim 2, wherein said particular wave lengths of the two light receiving means exist in infrared region and in ultraviolet region, respectively.
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5. A device for detecting and recording a type of illumination employed in a camera comprising:
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(a) at least two light receiving means provided on the camera, having their sensitivity in different wave length regions from each other for receiving the light from a subject to be photographed, and for generating a signal from each of light receiving means in relation to the amount of the light received thereon; (b) a discriminating means provided in the camera for discriminating the type of illumination among the types of natural daylight type, fluorescent-light type and tungsten-light type, upon receipt of the signal from the light receiving means, and for generating a signal indicative of type of illumination; and (c) a recording means for recording a mark indicative of the type of illumination on a film in an exposure station upon receipt of the signal obtained from the discriminating means. - View Dependent Claims (6, 7, 8, 10)
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9. An automatic film processing system for automatically effecting development of an exposed film having marks on a non-image-receiving portion of each frame thereof, said marks being indicative of the type of illumination for each photograph taken, and for printing developed images on the exposed film onto a photosensitive paper, which comprises the combination of:
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(a) means for automatically developing the film; (b) means for reading out the marks on the non-image-receiving portion of each frame of the film to produce a read-out signal indicative of the marks on each frame; and (c) means for effecting the printing according to the read-out signal indicative of the type of the illumination.
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Specification