JP2000162678A - Camera and developing system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain with a simple structure a color balance correcting function, capable of being applied to any camera by correcting the color balance of photographing light according to output from a flashing time forming part before the photographing light is made incident on an image pickup part. SOLUTION: A flash light emitting part 10 is a flashing device capable of changing its emitted light quantity by changing a flashing time to many stages, and the flashed light quantity is set by a setting part 12 attached to a camera main body or a flashing device main body. The flashing time forming part 13 calculates the flashing time of the flashing part 10 from the set emitted light quantity, and the flashing part 10 controls the emitted light quantity, in accordance with the obtained information. A filter insertion part 11 selects an optimum color filter for making the color temperature of SB light changed according to the light-emitting time to coincide with the color temperature of the used film, based on the information from the forming part 13 and inserts it in a photographing optical path. A recording part 14 magnetically records information on the flashing time of the SB on the film based on the information from the forming part 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera using a flash device or a developing system for developing a film photographed by the camera.

[0002]

2. Description of the Related Art Conventionally, as a device for correcting a change in color temperature due to a difference in light emission time of a flash light emitting device (hereinafter referred to as SB), Japanese Patent No. 2668984 and Japanese Patent Application Laid-Open No. 7-1234 are disclosed.
There was one as seen in Japanese Patent Publication No. 23. The former device 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 such that a voltage value proportional to the real time when the light control strobe 101 emits light at the time of shooting is obtained by the integration circuit 102, and the white balance correction unit 103 corrects the white balance of the shot image according to the output. is there.

The latter device relates to a strobe device for controlling the color temperature of strobe light. Its configuration is as shown in FIG.
02, 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 are provided.
The pre-emission unit 201 performs pre-emission before photographing, the reflected light is detected by the reflected light amount detection unit 203, and the main light emission amount calculation unit 204 calculates the main light emission amount based on the information. . On the other hand, the color temperature detecting means 20
2 detects the color temperature of the ambient light of the scene. Then, the color temperature conversion unit 205 performs correction so that the emission color temperature during the main light emission becomes equal to the color temperature of the ambient light, and causes the main light emission unit 206 to emit light during shooting.

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 object appears white in an electronic image (mainly electrically). "Specifically, when capturing a white object illuminated by a light source with a certain color temperature, The camera's encoder output must be zero subcarrier (electrically achromatic), which means adjusting the gain of each channel to achieve zero subcarrier for light sources of various color temperatures. " The imaging means is limited to an electronic image.

[0005] On the other hand, the color balance literally refers to a general technique for adjusting the color balance of the image pickup means. "Specifically, in color reproduction such as color photography and color printing, the relationship between light and darkness of each primary color image, and It refers to the fidelity of the reproduction of achromatic colors. It is said that the color balance is good when the achromatic colors are reproduced almost faithfully, "the imaging means is not limited to electronic images.

[0006]

However, FIG.
Since the white balance correction unit 103 corrects the white balance after the light control strobe 101 has finished emitting light, the device described in (1) has a drawback that color correction cannot be performed until after the strobe has finished emitting light. Since the apparatus shown in FIG. 13 is applied to an electronic camera, it is possible to correct the color balance even after shooting is completed. However, in the case of a silver halide camera, the color balance of the film cannot be corrected after shooting. Yes, this device cannot be applied. Further, the apparatus shown in FIG. 14 has a drawback that a complicated mechanism such as an SB capable of pre-emission and a color temperature detecting means is required.

Therefore, the present invention provides a camera having a color balance correction function applicable to any camera without requiring a complicated mechanism, and a developing system for developing a film photographed by the camera. The purpose is to provide.

[0008]

The above objects of the present invention are attained by the following means. According to a first aspect of the present invention, there is provided a light emitting time forming section for forming a signal corresponding to a flash light emitting time, and a correcting section for correcting a color balance according to an output of the light emitting time forming section.

According to a second aspect of the present invention, the correction section selectively inserts a color balance correction filter into the photographing optical path. According to a third aspect of the present invention, the correction section includes a liquid crystal filter for correcting color balance in a photographing optical path, and corrects color balance by changing a liquid crystal density of the liquid crystal filter.

According to a fourth aspect of the present invention, there is provided a light emitting time forming section for forming a signal corresponding to a flash light emitting time, and a recording section for recording an output of the light emitting time forming section on a recording medium. According to a fifth aspect of the present invention, there is provided a light emitting time reading section for reading a signal corresponding to a flash light emitting time recorded on a recording medium, and a correcting section for correcting a color balance based on information of the light emitting time reading section.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a camera according to one embodiment of the present invention. The flash light emitting unit 10 is a flash device whose light emission amount can be changed by changing the light emission time in multiple stages, and the light emission amount is set by a setting unit 12 attached to the camera body or the flash device body. The setting unit 12 can set the light emission amount of the flash light emitting unit to four levels of full light emission, 1/2 light emission, 1/4 light emission, and 1/8 light emission. Output to In the light emission time forming unit 13,
From the light emission amount set by the setting unit 12, the flash light emitting unit 1
The light emission time of 0 is calculated, and the flash light emitting unit 10 controls the light emission amount according to the information. Also, the filter insertion unit 11
Based on the information from the light emission time forming unit 13, an optimum color filter for matching the color temperature of the SB light that changes according to the light emission time with the color temperature of the used film is selected and inserted into the photographing optical path. The recording unit 14 magnetically records the SB emission time information on the film based on the information from the emission time formation unit 13.

FIG. 2 is a diagram showing an optical system according to an embodiment of the present invention. The light beam that has passed through the taking lens 1 is bent by the quick return mirror 2 and forms an image on the diffusion screen 3 once. The light beam further reaches the photographer's eye through the condenser lens 4, the pentaprism 5, and the eyepiece 6. At the time of photographing, the aperture 7 is stopped down to the set value at the same time as the quick return mirror 2 is flipped up, and the shutter 8 is opened only for the set time to expose the film 9. In addition, the flash light emitting unit 10 emits light for a set light emission time in synchronization with the full opening of the shutter 8. Prior to photographing, the filter insertion unit 11
An optimum filter corresponding to the flash emission time set by 0 is selected and inserted into the photographing optical path. When the photographing is completed, the flash emission time is magnetically recorded on the film 9 by the recording unit 14.

FIG. 3 is a diagram showing the relationship between the SB emission time and the color temperature of SB light. As shown in the figure, the shorter the light emission time, the higher the color temperature of the SB light. FIG.
FIG. 4 is a diagram showing a relationship between a light emission time and a light emission intensity of SB.
As shown in the figure, the emission intensity initially increases with time, decreases after the peak, and finally disappears.
In the case of full light emission, light emission is performed until the charge stored in the capacitor (not shown) is completely discharged.
In the case of light emission, 1/4 light emission, and 1/8 light emission, the light emission amount is controlled by interrupting the light emission on the way. The interruption time differs for each individual SB, and even for the same individual SB depending on the charging voltage of the capacitor immediately before light emission.
The light emission time at each light emission amount may be stored in a memory with the individual difference of SB and the charging voltage as a parameter, or may be stopped when a light emission amount reaches a predetermined value while monitoring by separately providing a monitor element. May be.

FIG. 5 is a view for explaining an example in which the filter insertion unit 11 operates in the camera. As shown, a filter insertion mechanism 11a slidable by, for example, a rack or a pinion mechanism is provided behind the mount of the single-lens reflex camera. A plurality of filters are stored at the position A so that a plurality of filters can overlap with each other in a different color temperature direction in the optical axis direction. At the time of use, an optimal filter is selected according to the color temperature conversion value, and the filter is slid to the position B. When each of the plurality of filters slides to the B position, the 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.

FIG. 6 is a view for explaining a place where the filter insertion mechanism 11a is inserted between the taking 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 having a plurality of different color temperature conversion values is provided in a disk, and when used, an optimum filter is selected by rotating the disk in accordance with the color temperature conversion value, and is placed on the optical axis. insert. The rotational position of the disk 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 at the rear of the mount as shown in FIG.

FIG. 8 shows a liquid crystal type filter insertion mechanism 11c.
FIG. 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. Normally, the color temperature of the SB is 5500 ° K, which is the standard color temperature of the daylight film, but it becomes higher as the light emission time becomes shorter.
Therefore, the color of the liquid crystal may be colored in an amber system in a direction of decreasing the color temperature, and the density may be controlled according to the color temperature conversion value. Further, if the blue liquid crystal and the amber liquid crystal are overlapped, the color temperature can be corrected from a colorless state to a higher or lower color temperature.

FIG. 10 is a diagram showing a portion where the recording section 14 records the light emission time information. In film 9, 9
a 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 a portion 9b by a magnetic head provided in the recording unit 14. Furthermore, the filter insertion unit 1
If information on whether or not the color temperature has been converted in step 1 is also recorded, it is possible to prevent the color temperature from being corrected twice in the subsequent development processing.

FIG. 11 is a flowchart showing the operation of the camera according to the embodiment of the present invention. When the release switch of the camera (not shown) is half-pressed, the power of 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 light emission modes: full light emission, 1/2 light emission, 1/4 light emission, and 1/8 light emission. Next, in step S102, it is determined whether the mode is the full light emission mode. If so, the time value t0 shown in FIG. 4 is substituted for 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 the light emission is ２, 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. If so, t = t2 in step S107.
Is assigned. If it is not 1/4 light emission, it is 1/8 light emission, so t = t3 is substituted in step S108. Next, an optimal filter according to the light emission mode set in step S109 is selected, and inserted into the photographing optical system by the filter insertion unit 11. Step S11
At 0, it is determined whether or not the release switch has been fully pressed. If the release switch has been fully pressed, exposure control on 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 half-press start time has passed a predetermined time. If the predetermined time has not passed yet, the process returns to step S101 to repeat the processing. finish.

FIG. 12 is a block diagram showing the configuration of the development processing system. The reading unit 15 reads the emission time information of the SB magnetically recorded on the photographed film and the inserted filter information. The correction value calculation unit 16 is configured as shown in FIG.
The color temperature conversion value to be corrected at the time of print printing is calculated from the color temperature information obtained from the SB emission time and the inserted color temperature conversion filter information. Exposure unit 1
7 performs print printing by performing a color temperature conversion process based on the calculated correction value.

[0020]

As described above in detail, according to the present invention, the correction unit for correcting the color balance according to the light emission time of the flash device is provided, so that the difference in the color temperature of the flash light emission due to the difference in the light emission time can be reduced. Good correction can be achieved. Further, the color balance of a film photographed by a camera capable of recording the light emission time of the flash device can be corrected well.

According to the first aspect, the corrector for correcting the color balance enables excellent color reproduction regardless of the light emission time of the flash device. According to the second aspect, by selectively inserting a filter for color balance correction, good color reproduction can be achieved even when the color temperature of flash light emission changes in a plurality of steps.

According to the third aspect, by changing the density of the liquid crystal filter for color balance correction, good color reproduction can be achieved even when the color temperature of flash light emission changes in a complicated manner. According to the fourth aspect, by recording the flash light emission time on the recording medium, the color temperature can be corrected in the subsequent development processing. According to the fifth aspect, by reading a signal corresponding to the flash emission time recorded on the recording medium and correcting the color balance, it is possible to correct a subtle color temperature deviation that could not be corrected at the time of photographing at the time of printing.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a camera according to the present invention.

FIG. 2 is a diagram illustrating an optical system according to an embodiment.

FIG. 3 is a diagram illustrating a relationship between a light emission time and a color temperature of SB.

FIG. 4 is a diagram showing the relationship between the light emission time and the light emission intensity of SB.

FIG. 5 is a diagram showing the operation of the filter insertion unit of the embodiment in an easily understandable manner.

FIG. 6 is a diagram illustrating a filter insertion unit according to the embodiment.

FIG. 7 is a diagram illustrating a filter insertion unit according to the embodiment.

FIG. 8 is a diagram illustrating a filter insertion unit according to the embodiment.

FIG. 9 is a diagram showing the relationship between the voltage of the liquid crystal and the density.

FIG. 10 is a diagram showing a portion recorded on a film.

FIG. 11 is a flowchart illustrating 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 Diffusing screen 4 Condenser lens 5 Penta prism 6 Eyepiece 7 Aperture 8 Shutter 9 Film 10 Flash light emitting unit 11 Filter insertion unit 12 Setting unit 13 Light emission time forming unit 14 Recording unit 15 Reading unit 16 Correction value Calculation unit 17 Exposure unit 101 Light control strobe 102 Integrator 103 White balance correction unit 201 Pre-light emission unit 202 Color temperature detection unit 203 Reflected light amount detection unit 204 Main emission amount calculation unit 205 Color temperature conversion unit 206 Main light emission unit 4

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G03B 17/50 G03B 17/50 Z 5C022 H04N 5/238 H04N 5/238 Z 5C065 9/04 9/04 B F-term (reference) 2H002 CD00 EB17 GA33 GA58 GA59 HA28 2H053 AA00 AD00 CA33 2H083 AA03 AA15 AA36 AA54 2H088 EA49 HA21 HA24 HA28 MA05 2H104 AA01 CE11 5C022 AA13 AB15 AC02 AC52 AC54 AC55 5C065 AA03 BB03 CC

Claims (5)

[Claims] An emission time forming unit for forming a signal corresponding to a flash emission time; correcting a color balance of the imaging light before the imaging light is incident on the imaging unit in accordance with an output of the emission time formation unit; A correction unit; 2. The camera according to claim 1, wherein the correction unit selectively inserts a color balance correction filter into a photographing optical path. 3. The camera according to claim 1, wherein the correction unit includes a liquid crystal filter for correcting color balance in a photographing optical path, and corrects color balance by changing a liquid crystal density of the liquid crystal filter. . 4. A camera, comprising: a light emission time forming unit that forms a signal corresponding to a flash light emission time; and a recording unit that records an output of the light emission time formation unit on a recording medium. 5. A light emitting time reading section for reading a signal corresponding to a flash light emitting time recorded on a recording medium; and a correcting section for correcting a color balance based on information of the light emitting time reading section. Development system.