JPS5918689B2 - Shooting method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for photographing an object illuminated by an illumination light source on a photoconductor, which corrects uneven exposure in a device to obtain uniform exposure illuminance on the surface of the photoconductor. be.

In general, a camera that illuminates a subject (original) such as a document, book, or drawing with an illumination light source and exposes a photoreceptor with the reflected light;
In photographic devices such as copying machines, it is difficult to make the amount of light reaching the photoreceptor uniform, and the center is usually brighter than the periphery.

Furthermore, if a plurality of illumination light sources are used, unevenness in the amount of light caused by this also becomes a problem. The present invention adjusts this unevenness in light amount,
An object of the present invention is to provide a photographing method that can obtain constant and uniform exposure illuminance on an image forming surface, that is, on a photoreceptor surface.

Hereinafter, the present invention will be explained with reference to the drawings.

Figure 1 shows a method camera to which the present invention is applied.
11 is a support stand, 12 is an arm fixed to the support stand 11, 1
3 is a lighting device provided at the tip of the arm 12.

The lighting device 13 has a lamp such as a fluorescent lamp and a reflective shade,
An original 15 such as a drawing or a document placed on the original placing plane of the support stand 11 is illuminated by light emitted from the illumination device 13 .

Reference numeral 15 indicates a column installed on the support base 11, 16 indicates a camera body which is arranged on the column 15 so as to be movable in the vertical direction and is held at an arbitrary height position, and IT indicates a column between the camera body 16 and the document placement plane. An exposure adjustment member is placed between the two.

The camera body 16 has a photographing lens, a film, etc. The reflected light from the original 14 is projected onto the film in the camera body 16 through the adjustment member IT. The exposure amount adjustment member IT adjusts the illumination unevenness of the document caused by the illumination device 13, and
The basic structure is an electrochromic material layer that has the property of changing the amount of light transmitted when a voltage is applied, and a photoconductive layer.

Electrochromic substances are substances that develop or change color as a result of changes in their light absorption characteristics when energized, and that reversibly disappear or return to their original color by energization with the opposite polarity to the energization, heating, or a combination of both. It has the property of exhibiting a phenomenon (electrochromy phenomenon) that depends on electrical polarity.

The degree of color development or discoloration reaches a certain range where it reaches saturation.
It depends on the amount of electrical energy when energized.

The mechanism that causes the electrochromy phenomenon is not necessarily single, but in many cases it is considered to be a so-called redox reaction between an electrolyte and a coloring substance. In this case, the electrolyte and the coloring substance are not necessarily distinguished from each other in terms of materials. The same substance can be a color-forming substance and an electrolyte at the same time. Another view is that the change in light absorption characteristics is due to the injection of injected electrons into the color center, as in the case of photochromy, and in reality, the electrochromy phenomenon occurs as a result of a combination of these factors. It is understood that Since the electrochromy phenomenon electrically changes the inherent color of a material, the combinations of colors are diverse.

Also, whether a material can transmit, reflect, or scatter light does not depend on the properties of the material itself, but rather on the method of forming the electrochromic layer. These configurations and the aforementioned diversity, as well as the ability to remember that color development lasts until it is erased from the time it occurs, and the fact that there are also materials whose color development changes in response to the applied voltage value, are diverse. Due to its potential applications, research has been actively conducted in recent years.

Materials exhibiting electrochromic phenomena exist in a wide range of organic and inorganic substances.

Among these, any transparent material can be used in the present invention. 2A to 2D show various embodiments of the exposure amount adjustment member, and in the same figure, 1, 1'
is a transparent substrate, and 2 and 2f are transparent electrodes made of In2O3, SnO2, etc.

3 is a transparent optical semiconductor layer, and 4 is an electrochromic material layer, which is made of a transition metal compound such as WO3 or TiO2, and is transparent.

Reference numeral 5 denotes a transparent electrolyte layer called a resistor necessary for returning the electrochromic material layer 4, which has developed a color due to the electrochromic phenomenon, to its original transparent state.

3″ is a transparent layer made of a uniform mixture of optical semiconductor and electrolytic tube;
4'' is a transparent layer in which an electrochromic substance and an optical semiconductor are uniformly mixed.

This adjustment member 17 is transparent when no voltage is applied between the electrodes 2 and 2'', but when a voltage is applied between the transparent electrodes 2 and 2'', the adjustment member 17 When the light pattern is irradiated, the electrochromic material layers 4 and 1 are energized in accordance with the light pattern, and the electrochromic material layer develops or changes color in accordance with the light pattern.Next, a voltage of opposite polarity to the above is applied. When light is applied to the entire surface of the optical semiconductor layers 3, 3'', and 4'' while being applied between the transparent electrodes 2 and 2', the electrochromic substance layer is decolored and returns to its original transparent state.First In the device shown in the figure, on the document placement surface of the support stand 11,
When a piece of paper whose entire surface has a uniform reflectance is placed and the illumination device 13 is turned on, bright and dark areas are created on the paper surface due to external light and the illumination device 13, and the line A in FIG. 3A is formed on the paper surface. The illuminance distribution shown in is shown.

With such an illuminance distribution generated, an appropriate voltage is applied between the transparent electrodes 2 and 2' of the adjustment member 17, and this adjustment member 1
When 7 is exposed to light reflected from the paper surface, the optical semiconductor layers 3, 3
The resistance values of ' and 4' change depending on the amount of exposure. As a result, the electrochromic material layers 4, 4'' develop a color in accordance with the illuminance distribution on the paper surface.The density distribution of the colored adjustment member 17 becomes as shown by line B in FIG. 3B.Therefore, the color develops. The transparency of the adjustment member 17 changes depending on the illuminance distribution on the paper surface, and the distribution of the amount of light reflected from the paper surface after passing through the adjustment member 17 becomes uniform. If the camera body 16 takes a picture through the adjustment member 17 whose transparency has been changed, it will be equivalent to taking a picture with the document uniformly illuminated, and the exposure amount on the film surface will be uniform. If you want to erase the color,
By applying a voltage of opposite polarity to the above voltage between the transparent electrodes 2 and 2' to illuminate the entire surface of the adjustment member, the original transparent state can be restored.

In addition, if the illumination unevenness on the document surface changes due to deterioration in the lamp capacity of the illumination device 13 or partial replacement of the lamp, the adjustment member 7 should be decolored to return to the original transparent state. If the adjustment member is colored again to correct new illumination unevenness in the same manner as described above, the amount of exposure to the film can be made constant and uniform.

FIG. 4 shows an embodiment in which the adjustment member is placed overlapping the document. The transparent substrate 1 or the transparent electrode 2
is a substantially transparent filter that blocks the wavelength region of the spectral sensitivity of the photoconductive layer 3, and the transparent substrate is further subjected to nano-glare treatment.

In the first embodiment, a sheet of paper with a uniform reflectance is placed on the document placement surface, and then the adjustment member is colored in accordance with the illuminance distribution on the sheet surface. Instead of using paper with a uniform reflectance, an original having image information is used to cause the adjustment member to develop color so as to correct uneven illumination.

This is because the photoconductive layer 3 is sensitive only to a specific wavelength range of the light emission wavelength range of the illumination device 13, and although the light of this specific wavelength is not irradiated onto the surface of the document, the photoconductive layer surface is sensitive to the light emission wavelength range (camera). Since the illuminance distribution of the inner film (which has spectral sensitivity in this wavelength range) and that of the aforementioned specific wavelength range are relatively constant, the adjustment member 7 develops color to correct the unevenness of illumination.

In FIG. 5, the adjustment member 17 used in FIG.
This shows an example in which the lens is placed on the front side of the film in the lens, that is, between the lens and the film.

L is a lens for photographing the original 14. According to this embodiment, it is possible to correct the effect of the COs θ4 of the lens and the unevenness of illumination, thereby obtaining a uniform exposure distribution on the film surface. FIG. 6 shows a rotary camera, in which an original 14 having image information on both the front and back sides is fed between a pair of adjustment members 17, and images on both sides of the original are synchronized with the original through a reflecting mirror 20. Photographs are taken on moving microfilm.

Reference numeral 13 denotes an illumination device that illuminates both sides of the document 14.

The illumination device 13 includes a plurality of lamps arranged in a direction perpendicular to the document feeding direction. In the embodiments of FIGS. 5 and 6, the method of causing the adjustment member 17 to develop color so as to correct the unevenness of the exposure distribution is the same as described above. Note that instead of a reflective object, a transparent or translucent object may be used, light is irradiated from the back of the object, and the object is photographed through the adjustment member.

[Brief explanation of the drawing]

Fig. 1 is a schematic configuration diagram of a flat-bed camera using the present invention, Figs. 2 A-D are configuration diagrams of the exposure amount adjustment member, Figs. Figures 6 through 6 are schematic configuration diagrams showing other embodiments of the present invention. 13...Lighting device, 16...Camera body, 17...Exposure adjustment member.

Claims (1)

[Claims] 1. An exposure amount adjusting member whose basic structure is a photoconductive layer and a material layer that changes the amount of light transmitted when a voltage is applied is placed between the subject and the photoreceptor, and the amount of light is adjusted according to the unevenness of exposure on the surface of the photoreceptor. A photographing method characterized in that the amount of exposure is made uniform by changing the amount of light transmitted through an adjustment member and projecting light from a subject onto a photoreceptor through the adjustment member.