JP4423686B2 - Camera and development system - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a camera using a flash light emitter or a developing system for developing a film photographed by the camera.
[0002]
[Prior art]
Conventionally, as a device for correcting a change in color temperature due to a difference in light emission time of a flash light emitter (hereinafter referred to as SB), there are devices as shown in Japanese Patent No. 2668984 and Japanese Patent Laid-Open No. 7-123423. . The former apparatus relates to white balance adjustment of an electronic camera, and includes a light control strobe 101, an integration circuit 102, and a white balance correction unit 103 as shown in FIG. The operation is that the integration circuit 102 obtains a voltage value proportional to the real time that the light control strobe 101 emits light during photographing, and the white balance correction unit 103 corrects the white balance of the photographed image according to the output. is there.
[0003]
The latter device relates to a strobe device that controls the color temperature of the strobe light. As shown in FIG. 14, the configuration includes a pre-light emission unit 201, a color temperature detection unit 202, a reflected light amount detection unit 203, a main light emission amount calculation unit 204, a color temperature conversion unit 205, and a main light emission unit 206. The pre-emission unit 201 performs pre-emission prior to shooting, the reflected light is detected by the reflected light amount detection unit 203, and the main emission amount calculation unit 204 calculates the main emission amount based on the information. . On the other hand, the color temperature detection means 202 detects the color temperature of ambient light in the object scene. Then, the color temperature conversion unit 205 performs correction so that the emission color temperature during main light emission is equal to the color temperature of ambient light, and the main light emission unit 206 is caused to emit light during photographing.
[0004]
Here, the white balance and the color balance will be briefly described. White balance is a technology that adjusts the color balance so that a white subject appears white in an electronic image (mainly electrically). “In detail, when a white object illuminated by a light source of a certain color temperature is imaged, The camera encoder output for this must be in the state of subcarrier zero (electrically achromatic), which means adjusting the gain of each channel so that the subcarrier is zero for various color temperature light sources. The imaging means is limited to an electronic image.
[0005]
On the other hand, color balance literally refers to the overall technology for adjusting the color balance of the imaging means. “In detail, in color reproduction such as color photography, color printing, etc. The imaging means is not limited to an electronic image, saying that the color balance is good when the achromatic color is reproduced almost faithfully.
[0006]
[Problems to be solved by the invention]
However, in the apparatus shown in FIG. 13, the white balance correction unit 103 corrects the white balance after the light control strobe 101 has finished emitting light. There is a disadvantage that can not be. Further, the apparatus shown in FIG. 14 of HYPERLINK “IMG000016” has a drawback that it requires a complicated mechanism such as SB capable of pre-emission and color temperature detection means.
[0007]
Accordingly, the present invention provides a camera having a color balance correction function that does not require a complicated mechanism and can be applied to any camera, and a developing system for developing a film photographed by the camera. With the goal.
[0008]
[Means for Solving the Problems]
The above object is achieved by the following means. A light emission time forming unit that forms a signal according to a flash light emission time with a set issuance amount ; and a color temperature of the flash light emission that changes according to the light emission time based on output information of the light emission time formation unit In order to match the color temperature of the recording medium, by selectively inserting and removing a color balance correction filter in the photographic optical path and behind the photographic lens, the photographic light captures the color balance of the photographic light. A correction unit that corrects the light before entering the sensor; detection means for detecting that the filter has been inserted / removed; timer means for starting a predetermined time by pressing the release switch halfway; Determining means for determining whether or not the release switch has been operated after the insertion; the determining means determines that the release switch has been fully pressed; If it is determined that the release switch is not fully depressed, it is determined whether or not the predetermined time by the timer means has passed without performing the exposure control. Exposure control means for waiting for an output from the light emission time forming unit when the predetermined time has not elapsed, and ending a series of processing when the predetermined time has elapsed.
[0009]
According to a second aspect of the present invention, a light emission time forming unit that forms a signal according to a flash light emission time with a set issuance amount ; and a color balance of the photographing light according to an output of the light emission time forming unit is set in the photographing light path. A correction unit that includes a liquid crystal filter for color balance correction at the rear of the photographing lens, changes the liquid crystal density of the liquid crystal filter, and continuously changes the color temperature conversion value; Determining means for determining whether or not the release switch has been operated after the liquid crystal density has been changed; timer means for starting a predetermined time by pressing the release switch halfway; and determining the release by the determining means. When it is determined that the switch is fully pressed, exposure control is performed, but it is determined that the release switch is not fully pressed. If the predetermined time by the timer means is further determined without performing the exposure control, if the predetermined time has not elapsed, waiting for the output from the light emission time forming unit, Exposure control means for ending a series of processing when the predetermined time has elapsed.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of a camera according to an embodiment of the present invention. The flash light emitting unit 10 is a flash device capable of changing the light emission amount by changing the light emission time in multiple stages, and the light emission amount is set by the setting unit 12 attached to the camera body or the flash device body. In the setting unit 12, the light emission amount of the flash light emitting unit can be set in four stages of full light emission, 1/2 light emission, 1/4 light emission, and 1/8 light emission. Is output. The light emission time forming unit 13 calculates the light emission time of the flash light emitting unit 10 from the light emission amount set by the setting unit 12, and the flash light emitting unit 10 controls the light emission amount according to the information. Further, the filter insertion unit 11 selects an optimum color filter for matching the color temperature of the SB light, which changes depending on the light emission time, with the color temperature of the film used based on the information from the light emission time forming unit 13. Insert in the optical path. The recording unit 14 magnetically records the SB light emission time information on the film based on the information from the light emission time forming unit 13.
[0012]
FIG. 2 is a diagram showing an optical system according to the embodiment of the present invention. The light beam that has passed through the photographic lens 1 is bent by the quick return mirror 2 and once forms an image on the diffusing screen 3. The luminous flux further passes through the condenser lens 4, the pentaprism 5, and the eyepiece lens 6 and reaches the photographer's eye. At the time of shooting, the quick return mirror 2 is flipped up, and at the same time, the diaphragm 7 is narrowed down to the set value, and the shutter 8 is opened only for the set seconds, and the film 9 is exposed. In addition, the flash light emitting unit 10 emits light in the set light emission time in synchronization with the shutter 8 being fully opened. The filter insertion unit 11 selects and inserts an optimum filter corresponding to the flash emission time set by the flash emission unit 10 prior to imaging into the imaging optical path. When the photographing is completed, the flash emission time is magnetically recorded on the film 9 by the recording unit 14.
[0013]
FIG. 3 is a diagram showing the relationship between the SB emission time and the color temperature of the SB light. As shown in the figure, the color temperature of the SB light increases as the light emission time decreases.
FIG. 4 is a diagram showing the relationship between the light emission time and the light emission intensity of SB. As shown in the figure, the first emission intensity increases with time, and after passing the peak, it decreases this time and finally disappears. In the case of full light emission, light is emitted until the electric charge charged in the capacitor (not shown) is completely discharged, but in the case of 1/2 light emission, 1/4 light emission, and 1/8 light emission, the light emission is halfway. The amount of light emission is controlled by interrupting at. The interruption time differs for each SB individual and also for the same individual depending on the charging voltage of the capacitor immediately before light emission. The light emission time for each light emission amount may be stored in the memory with individual differences of SB and charging voltage as parameters, or stopped when the light emission amount reaches a predetermined value while monitoring by providing a separate monitor element. May be.
[0014]
FIG. 5 is a diagram illustrating an example in which the filter insertion unit 11 operates in the camera. As shown in the figure, a filter insertion mechanism 11a slidable by, for example, a rack and pinion mechanism is provided behind the mount of the single-lens reflex camera. A plurality of filters are stored at the position A so as to overlap in the optical axis direction so that a plurality of different color temperature conversions are possible. In use, an optimum filter is selected according to the color temperature conversion value, and is slid to the position B. When each of the plurality of filters slides to the B position, insertion of each filter is detected by turning on each detection switch. This makes it possible to detect what filter has been selected and inserted.
[0015]
FIG. 6 is a diagram illustrating a place where the filter insertion mechanism 11 a is inserted between the photographing lens 1 and the film 9.
FIG. 7 is an explanatory diagram of the rotary filter insertion mechanism 11b. As shown in the figure, a filter with a plurality of different color temperature conversion values is provided in the disc, and when used, the optimum filter is selected by rotating the disc on the optical axis according to the color temperature conversion value. insert. The rotational position of the disc is detected by an encoder. This makes it possible to detect what filter has been selected and inserted. The place where the filter insertion mechanism 11b is provided may be behind the mount as shown in FIG.
[0016]
FIG. 8 is an explanatory diagram of a liquid crystal type filter insertion mechanism 11c. As shown in FIG. 9, the liquid crystal density changes according to the voltage value applied to the liquid crystal, and the color temperature conversion value changes continuously. Usually, the standard color temperature of SB is 5500 ° K which is the standard color temperature of the daylight film, but becomes higher as the light emission time becomes shorter. Therefore, the color of the liquid crystal may be colored in an amber system in which the color temperature is lowered, and the density may be controlled according to the color temperature conversion value. Furthermore, if the blue liquid crystal and the amber liquid crystal are stacked, the color temperature can be corrected from a colorless state to a higher or lower color temperature.
[0017]
FIG. 10 is a diagram showing a part where the recording unit 14 records the light emission time information. In the film 9, 9a is a portion where an image is optically recorded, and 9b is a portion where information is magnetically recorded. The light emission time information is magnetically recorded as a digital signal in the 9b portion by the magnetic head provided in the recording unit 14. Furthermore, if information on whether or not the color temperature has been converted by the filter insertion unit 11 is also recorded, it is possible to prevent the color temperature from being corrected twice during the subsequent development processing.
[0018]
FIG. 11 is a flowchart showing the operation of the camera according to the embodiment of the present invention. When the release switch of a camera (not shown) is pressed halfway, the camera is turned on and this flowchart is executed. First, the light emission mode set in the setting unit 12 in step S101 is read. In this case, there are four types of emission modes: full emission, 1/2 emission, 1/4 emission, and 1/8 emission. Next, in step S102, it is determined whether or not it is the full light emission mode. If so, the time value t0 shown in FIG. 4 is substituted into the variable t indicating the light emission time in step S103. If it is not full light emission, it is determined in step S104 whether it is half light emission, and if so, t = t1 is substituted in step S105. If not, it is determined in step S106 whether the light emission is 1/4, and if so, t = t2 is substituted in step S107. If it is not 1/4 light emission, it is 1/8 light emission, so t = t3 is substituted in step S108. Next, an optimum filter corresponding to the light emission mode set in step S109 is selected and inserted into the photographing optical system by the filter insertion unit 11. In step S110, it is determined whether or not the release switch has been fully pressed. If the release switch has been fully pressed, exposure control to the film is performed in step S111, and then magnetic recording on the film by the recording unit 14 is performed in step S112. The information to be recorded is the SB emission time and the inserted filter information. In step S113, it is determined whether the half-press timer started at the time of half-press activation has elapsed. If the predetermined time has not yet elapsed, the process returns to step S101 to repeat the process. finish.
[0019]
FIG. 12 is a block diagram showing the configuration of the development processing system. The reading unit 15 reads the SB light emission time information magnetically recorded on the photographed film and the inserted filter information. The correction value calculation unit 16 calculates a color temperature conversion value to be corrected at the time of print printing from the color temperature information obtained from the SB emission time as shown in FIG. 3 and the inserted color temperature conversion filter information. The exposure unit 17 performs a color printing process by performing a color temperature conversion process based on the calculated correction value.
[0020]
【The invention's effect】
As described above in detail, according to the present invention, by providing a correction unit that corrects the color balance according to the light emission time of the flash device, it is possible to satisfactorily correct the difference in the color temperature of the flash light emission due to the difference in the light emission time. Is possible. In addition, it is possible to satisfactorily correct the color balance of a recording medium shot with a camera capable of recording the light emission time of the flash device.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of a camera of the present invention.
FIG. 2 is a diagram illustrating an optical system of an example.
FIG. 3 is a diagram illustrating a relationship between a light emission time of SB and a color temperature.
FIG. 4 is a diagram showing a relationship between SB emission time and emission intensity.
FIG. 5 is a diagram showing the operation of the filter insertion unit of the embodiment in an easy-to-understand manner.
FIG. 6 is a diagram illustrating a filter insertion portion of the embodiment.
FIG. 7 is a diagram illustrating a filter insertion portion of the embodiment.
FIG. 8 is a diagram illustrating a filter insertion portion of the embodiment.
FIG. 9 is a graph showing the relationship between the voltage of the liquid crystal and the concentration.
FIG. 10 is a diagram showing a recording portion on a film.
FIG. 11 is a flowchart showing the operation of the embodiment.
FIG. 12 is a block diagram showing a configuration of a developing system of the present invention.
FIG. 13 is a diagram showing a conventional technique.
FIG. 14 is a diagram showing a conventional technique.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Shooting lens 2 Quick return mirror 3 Diffusion screen 4 Condenser lens 5 Penta prism 6 Eyepiece 7 Aperture 8 Shutter 9 Film 10 Flash light emission part 11 Filter insertion part 12 Setting part 13 Light emission time formation part 14 Recording part 15 Reading part 16 Correction value Calculation unit 17 Exposure unit 101 Dimming strobe 102 Integration circuit 103 White balance correction unit 201 Pre-light emission unit 202 Color temperature detection unit 203 Reflected light amount detection unit 204 Main light emission amount calculation unit 205 Color temperature conversion unit 206 Main light emission unit
Four

Claims (2)

A light emission time forming unit for forming a signal corresponding to a flash light emission time with a set issuance amount ; and based on output information of the light emission time formation unit, the color temperature of the flash light emission that changes according to the light emission time In order to match the temperature, the color balance correction filter is selectively inserted and removed in the imaging optical path and behind the imaging lens, so that the color balance of the imaging light is made before the imaging light enters the imaging unit. A correction unit to be corrected;
Detection means for detecting that the filter has been inserted and removed;
Timer means for starting a predetermined time by pressing the release switch halfway;
Determining means for determining whether or not a release switch has been operated after the filter has been inserted;
When it is determined by the determining means that the release switch has been fully pressed, exposure control is performed. However, when it is determined that the release switch has not been fully pressed, the exposure control is not performed and the exposure control is further performed. It is determined whether or not the predetermined time has elapsed by the timer means. When the predetermined time has not elapsed, the output from the light emission time forming unit is waited. When the predetermined time has elapsed, a series of processing is performed. An exposure control means for terminating the camera. A light emission time forming unit for forming a signal corresponding to the flash light emission time with a set issuance amount ; and a color balance of the photographing light according to the output of the light emission time forming unit in the photographing optical path and behind the photographing lens A correction unit that includes a liquid crystal filter for color balance correction, changes the liquid crystal density of the liquid crystal filter, and continuously changes the color temperature conversion value;
Determining means for determining whether or not a release switch has been operated after the liquid crystal density of the liquid crystal filter has been changed;
Timer means for starting a predetermined time by pressing the release switch halfway;
When it is determined by the determining means that the release switch has been fully pressed, exposure control is performed. However, when it is determined that the release switch has not been fully pressed, the exposure control is not performed and the exposure control is further performed. It is determined whether or not the predetermined time has elapsed by the timer means. When the predetermined time has not elapsed, the output from the light emission time forming unit is waited. When the predetermined time has elapsed, a series of processing is performed. An exposure control means for terminating the camera.

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