JPS6024562A - Color copying machine - Google Patents

Abstract

PURPOSE:To adjust the tone of a color of a copying picture by a simple constitution without using a filter, by varying a relative quantity of a luminous flux reaching an original surface of plural light sources having a different spectrum. CONSTITUTION:A reflected light from an original surface 5 irradiated by light sources 1, 2 is reflected by a mirror 6, passes through a lens 7, reflected by a mirror 8 and forms an image on the surface of a photosensitive drum 9. In this case, the image formed on the photosensitive drum 9 becomes an image of a color corresponding to a light emitting spectrum of the light sources 1, 2 and a reflection characteristic of the original surface 5. In a standard position of a knob 12 of a light quantity controller, a radiation illuminance on the original surface by the light sources 1, 2 becomes a characteristic curve 15, and when the knob 12 is turned to the R side, an input to the light source from the light source 1 becomes large relatively, and the radiation illuminance of the original surface becomes a characteristic curve 16. In this case, an image formed on the photosensitive drum 9 becomes an image whose red tint is more than that of a standard case, and a red tint can be increased on a copy picture. When the knob 12 is turned in reverse, a cyan tint can be increased comparing with a standard case.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a color copying machine that inputs an optical image obtained from a document and obtains a copied image by electrophotography or other methods.

Conventional configuration and its problems In conventional color copying machines, the light source has a fixed spectrum. Various filters were installed between the original and the imaging unit to absorb specific wavelengths. In the method of obtaining a color copy image by repeating the exposure and development process three or four times (hereinafter referred to as the three-shot method), in order to adjust the hue, in addition to three or four types of filters corresponding to the number of exposures, In addition, a color adjustment filter was provided and replaced, or the illuminance of the document surface by the light source was changed for each exposure.

On the other hand, in the one-shot method, in which a color copy image is obtained by one exposure and development, the color tone is adjusted by changing the type of filter inserted between the document surface and the imaging unit. Among these methods, the three-shot method, which uses a filter to adjust the hue, or the one-shot method, which conventionally required the use of a filter, requires an extra filter to adjust the hue, which only increases costs. However, the structure of the filter replacement reservoir was complicated, and the copying speed was reduced due to loss of light amount.

OBJECTS OF THE INVENTION The present invention provides a color copying machine that overcomes the drawbacks of the three-shot method, which performs color adjustment using filters, or the seven-shot method, in which color adjustment using filters is conventionally essential. The purpose is to

DESCRIPTION OF THE INVENTION The color copying machine of the present invention is characterized by comprising a plurality of light sources having different spectra and means for changing the relative amount of light flux reaching the document surface from each light source. The relative amount of this luminous flux can be changed by changing the input of the light source, moving the light source, rotating the light source, or moving the slit provided between the light source and the document surface. The color tone of the copied image is adjusted by changing the color tone.

DESCRIPTION OF THE EMBODIMENTS FIG. 1 shows an embodiment in which the present invention is applied to a one-shot type color copying machine. Reference numeral 1 denotes a first light source, and its light-emitting sgoctor has characteristics as shown in FIG. 2 is a second light source, and its emission spectrum has characteristics as shown in FIG.

In FIGS. 2 and 3, the horizontal axis shows the wavelength of light, and the vertical axis shows the radiant flux per unit wavelength.

Reference numeral 3 denotes a document, which is placed on a document table 4 with the side to be copied facing down. The light sources 1 and 2 have a cylindrical shape extending in the direction perpendicular to the plane of the paper. Original surface 5 illuminated by light sources 1 and 2
The reflected light is reflected by the mirror 6, passes through the lens 7, is reflected by the mirror 8, and forms an image on the surface of the photosensitive drum 9.

The image formed on the photosensitive drum at this time is an image of a color corresponding to the emission spectrum of the light source 1.degree.2 and the reflection characteristics of the document surface 5. 10 is a power supply source for the light sources 1 and 2, and 11 is a light amount adjuster that adjusts the relative amount of input supplied to the light sources 1 and 2.

In the standard position of the light amount adjuster knob 12, light sources 1 and 2 are
The irradiance on the document surface has the characteristics as shown in 15 in Figure 4.When knob 12 is turned to the R side, the input to the light source becomes relatively larger than that of light source 1, and the irradiance on the document surface becomes The characteristics are as shown in 16 in FIG. At this time, the image formed on the photosensitive drum has a reddish tint more than that in the standard case, and the reddish tint can be increased in the copied image. By turning knob 12 in the opposite direction, you can increase the cyan flavor even in the standard case.

As described above, in the collar embodiment, the hue of the copied image is adjusted by adjusting the relative outputs of light sources with different emission spectra.

FIG. 6 shows another embodiment in which light sources 17 and 18 have emission spectra as shown in FIGS. 2 and 3, respectively, and are supported by supports 19 and 20, respectively. The supports 19 and 20 have fixed shafts 21 and 22, respectively.
It is rotatably supported on the holder and is engaged with the adjustment frame 25 through pins 23 and 24 installed in each case.

In FIG. 6, the light sources 17, 18 are in standard positions, symmetrical with respect to the optical path center 26 of the reflected light.

By moving the adjustment frame 25 in the direction of the arrow 27, the positions of the respective light sources become as shown in FIG.
The irradiance on the document surface is relatively higher due to the light source 17. Therefore, the resulting copy image has more cyan tinge than in the standard case. If the adjustment frame is moved in the opposite direction, an image with a lot of red will be obtained.

FIG. 7 shows a light source section of another embodiment.

The light sources 30 and 31 each have the emission spectra shown in FIGS. 2 and 3 as before, and each has a fixed axis 32.
．． 33 so as to be rotatable.

Furthermore, fan-shaped gears 34 and 36 are fixed to the light sources 30 and 31, respectively, and are rotatable in conjunction with gears 4 degrees through gears 38 and 39 that are respectively supported by fixed shafts 36 and 37. Therefore, the knob 41 fixed to the gear 4°
By rotating the light sources 30, 31, the light sources 30, 31 are rotated in opposite directions. On the other hand, the light sources 30 and 31 have a partially shielding part 4 on the outer periphery.
It is composed of a fluorescent lamp covered with 26 and 42b, and has a light distribution characteristic as shown in FIG. 8 with respect to its radiation direction. 8th
In the figure, 43a to 43d represent the magnitude of luminous intensity in that direction by length. Therefore, when the knob 41 is turned as described above, the irradiance of each light source on the document surface changes, and the tone of the copied image can be adjusted as before.

FIG. 9 shows a light source section of still another embodiment. Light source 44.
45 is composed of a fluorescent lamp having the emission spectrum as shown in FIG. 2 and FIG.
It is fixed at 8.47.

The side plates 48,49 are each rotatably supported by a pin 50,61 implanted in the support 46,47, and are engaged with each other through a pin 52 implanted in the side plate 48. A slit 54 covering the outer periphery of the light source 44 is fixed to the side plate 48, leaving an opening 63. Side plate 4
Similarly, a slit 66 is fixed to 9 with an opening 55 left, but a sector-shaped gear 57 is further provided in a part thereof and engages with a gear 58. By turning a knob 59 fixed to the gear 68, the sulins 66 and 54 are rotated through their respective retaining portions. Therefore, the irradiance on the document surface due to each light source changes, and
Similarly, you can adjust the color tone of the copied image.

In the above embodiment, an example was shown in which the present invention was applied to a one-shot method, but the same configuration can be applied to a three-shot method by using three or more light sources with different spectra. In that case, one type of light source is turned on for each exposure, but the hue can be adjusted in the same manner as described above.

Effects of the Invention As described above, the present invention makes it possible to adjust the tone of a copied image without using a filter and with a simple configuration, and provides the following effects.

(1) Compared to the method of replacing filters, the color tone can be adjusted with a very simple □ configuration.

(2) Since the loss of light amount due to color adjustment is much smaller than in the method using a filter, the copying speed can be increased.

(3) Cost is reduced because no expensive filter is used.

(4) Continuous and minute adjustments are possible, whereas adjustments using filters require step-by-step adjustments based on the number of filters used.

[Brief explanation of the drawing]

Fig. 1 is a side view showing the schematic configuration of a color copying machine according to an embodiment of the present invention, Figs. 2 and 3 are diagrams showing the emission spectrum of its light source, and Fig. 4 shows documents at standard and adjustment times. A diagram showing a surface irradiance spectrum, FIG. 6 is a side view of a light source section of another embodiment, and FIG. 6 is a side view showing its operating state.
FIG. 7 is a side view of the light source section of another embodiment, FIG. 8 is a diagram showing the light source and its light distribution characteristics, and FIG. 9 is a side view of the light source section of still another embodiment. 1.2, 17, 18, 30, 31.44.45...
...Light source, 3...-Original, 4...Document stand, 6
, 8...Mirror, 7...Lens, 9...-
Photosensitive drum, 11... Light amount adjuster, 12, 41.
59...Knob, 16...Document surface irradiance spectrum at standard time, 16...Document surface irradiance spectrum during adjustment, 25...Adjustment frame, 42a, 42b.
...Shielding part, 64°56...Slit. 3 Name of agent Patent attorney Satoshi Nakao and one other person Figure 2, 5 Branch manager (run) Figure 3) Branch L (n-town, Figure 4, Figure 5 @

Claims (1)

[Claims:] A color copying machine, characterized in that it is equipped with means for copying. (2) The light source and the original are moved relative to each other while irradiating the original in a slit shape, and the original is irradiated with two types of light sources with different spectra from both sides of the optical path where light reflected from the original goes toward the lens. 2. A color copying machine according to claim 1, wherein the relative amount of light beam reaching the document from the light source can be changed. (3) A color copying machine according to claim 1 or 2, wherein the position of at least one light source relative to the document surface is movable. (4) A color copying machine according to claim 1 or 2, wherein at least one light source has different luminous intensities in the radiation direction and is configured to be rotatable. (6) A color copying machine according to claim 1 or 2, wherein a movable slit is provided between at least one light source and the document surface, and the light flux passing through the slit and reaching the document surface can be changed. .