JPH01195437A - Exposing device - Google Patents

Abstract

PURPOSE:To perform optional color correction by moving an original and a photosensitive recording medium to an image-formation means, varying the insertion quantity of a filter at the time of performing exposure all over the original and varying the mean value of the spectral characteristic of light which arrives at the photosensitive recording medium. CONSTITUTION:When an image formed on a color developing paper 24 is tinged with blue in case of comparing it with the image of an original 15, a yellow filter 28 is inserted into an optical path 31. At such a time, supposing that the slit width of a slit hole 13 is W, the insertion quantity of the yellow filter 28 into the optical path is (x) and the moving velocity of an original platen 11 is (v), the photosensitive pressure sensitive paper 19 is exposed by a time x/v with reflected light through the yellow filter 28 if the yellow filter 28 is closely brought into contact with the slit hole 13. Thereafter, it is exposed by a time (W-x)/v not through the yellow filter 28. The above is equivalent to the exposure which is performed by a time W/v with red light and green light and performed by the time x/v to blue light. Thus, only exposure to the blue light is suppressed, so that the optional color correction can be performed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an exposure apparatus such as a copying machine, and more particularly to a color correction mechanism thereof.

[Prior Art 1] In the exposure 1'tWi of a conventional copying machine using photosensitive paper, color correction is performed by uniformly covering the surface of the document or the exposed surface of the photosensitive paper with a color correction filter.

However, this method does not allow continuous adjustment of the degree of color correction and requires replacing a large number of color correction filters. Therefore, as shown in the specification and drawings of Utility Model Application No. 62-162974, a device has been conceived in which the degree of color correction can be adjusted by partially inserting a filter between the principal points of the lens group. There is.

[Problems to be Solved by the Inventionffl] However, when inserting a filter between the principal points of a lens, an opening for inserting the filter must be provided in the lens housing, and a space between the principal points of the lens must be provided. is determined by the characteristics of the lens, so there is no free space for the filter.

For this reason, depending on the type of lens, it may be difficult to insert the filter.

The present invention has been made to solve the above problems,
The purpose is to provide an exposure device that can perform arbitrary color correction without being restricted by lens characteristics or the like.

[Means for Solving the Problems 1] In order to solve the above-mentioned problems, the present invention provides an image forming means for forming an image of light from an original onto a photosensitive recording medium, and an image forming means for forming an image of light from an original onto a photosensitive recording medium, and a first moving means for moving the photosensitive recording medium relative to the imaging means in synchronization with the movement of the document; and a second moving means for moving the photosensitive recording medium relative to the imaging means, perpendicular to the moving direction of the photosensitive recording medium. and a filter arranged so as to be insertable in an optical path from the document to the photosensitive recording medium except between the principal points of the image forming means, so as to have filtering characteristics similar to that in the direction of This is a characteristic feature.

[Function 1] In the present invention having the above-mentioned VT, light from an original is imaged on a photosensitive recording medium via an imaging means. The original and the photosensitive recording medium are moved relative to the imaging means, and the entire surface of the original is exposed. At this time, if the insertion amount of the filter is changed, the average value of the spectral characteristics of the light that reaches the photosensitive recording medium changes.

[Example] An example embodying the present invention will be described below with reference to the drawings.

In FIG. 2, there is a transparent I! on which the original 15 is placed on the upper surface of the main body. An X document table 11 and a document table cover 12 that covers the document table 11 are provided. This document table 11 is moved by arrows A and B in FIG. 2 by driving a document drive unit (not shown).
is configured to move in the direction of This document drive section corresponds to the first moving means.

A slit hole 13 whose longitudinal direction is perpendicular to the moving direction of the document table 11 is provided on the upper surface of the main body. The slit hole 13 is located at the lower right of this slit hole 13.
A light source 16 is provided which illuminates the document 15 placed on the document table 11 through the document table 11 . An exposure table 17 is installed at a position where the light reflected from the original 15 is imaged by the lens 14, and a photosensitive pressure sensitive paper 19 wound up from a photosensitive pressure sensitive paper roll 18 is placed thereon. This photosensitive pressure sensitive paper 19 is proposed in Japanese Patent Application Laid-Open No. 58-88739. This photosensitive pressure sensitive paper 19 is
After passing through the control roller 21 and the control roller 21, it is wound up on a take-up roll 22. This developing section 20 includes a color developing paper cassette 2
The latent image formed on the photosensitive pressure sensitive paper 19 is transferred to the developing paper 24 taken out from the photosensitive pressure sensitive paper 19 to form a developed image. Further, the winding roll 22 is urged to rotate in the direction of arrow C shown in FIG. 2, and winds up the photosensitive pressure sensitive paper 19 sent out by the control row 221.

Therefore, the moving speed of the photosensitive pressure sensitive paper 19 depends on the rotational speed of the control roller 21. This control row 221 corresponds to the second moving means.

A filter unit 25 is arranged on the back side of the upper part of the main body. As shown in FIGS. 2 and 13, there are three yellow, magenta, and cyan transmission filters (yellow filter 28, magenta filter 29, respectively) inside the filter case 26.
A cyan filter 30) is arranged.

This filter unit 25 is provided inside a filter case 26 or is connected to a hole 2 provided on the left side of the filter case 26 in FIG. 2 by a near stepping motor.
7, each of the filters can be partially inserted into the optical path of the reflected light below the slit hole 13. A linear stepping motor is attached to each filter, as shown in FIG. These linear stepping motors 33 are operated by a CPU (central processing unit).
The control unit 34 is connected to a control unit 34 having a core. This control section 3
4 sends control signals to these linear stepping motors 33 to freely control the displacement of the movable parts of these linear stepping motors 33. This control section 34 is connected to an operation panel 35 that functions as a man-machine interface with an operator, and the operator moves the position of each filter via this operation panel 35. The filter, as shown in FIG.
In a cross section 31 taken horizontally through the optical path of the light that is imaged upward (the shape of the entry lift hole and the shape of the gap between the paths), the slits are inserted uniformly in the same direction as the longitudinal direction of the slit hole 13. Ru. Although FIG. 4 shows an example in which only the yellow filter 28 is inserted into the optical path, the magenta filter 29 and the cyan filter 30 can also be inserted in the same manner.

The operation of this embodiment configured as above will be explained below.

The original f1%15 is placed facing downward between the document table 11 and the document table cover 12. The document table 11 moves in the direction of arrow A in FIG. Move in direction B. In synchronization with this, the control roller 21 rotates, and the photosensitive pressure sensitive paper 19 is wound around the winding roll 22 at a constant speed. The circumferential speed of the control roller 21 is a value obtained by multiplying the moving speed of the document table 11 by the magnification of the image formed by the lens with respect to the document, and the light and pressure sensitive paper 19 is moved to the exposure table 11 at the same speed.
Move on 7.

The light emitted from the light source 16 is transmitted through the slit hole 13.
It is reflected by the original 15 passing above.

This reflected light forms an image on photosensitive pressure sensitive paper 19 by lens 14, as shown in FIG. Original M15 is slit hole 1
The speed at which the photosensitive and pressure sensitive paper 19 passes over the image 15 on the original 15 corresponds to the speed of the photosensitive pressure sensitive paper 19 as described above.
A reversed image of a is formed as a latent image on one photosensitive pressure sensitive paper. This latent image 19a is transferred onto developer paper 24 by the developing section 20.

Next, we will explain the method of color correction. For example, color developer paper 24
If the image formed on the original 15 has a bluish tinge compared to both images 15a of the original 15, it is necessary to remove some of the blue light component from the reflected light. In this case, the yellow filter 27 is inserted into the optical path 31 as shown in FIG. 4 by operating the processing panel 35. At this time, if the slit width of the slit hole 13 is W1, and the insertion amount of the yellow filter 28 into the optical path is X, and the moving speed of the document table 11 is V, then the yellow filter 28 is fully inserted into the slit hole 1.
3, the photosensitive pressure sensitive paper 19 is exposed to the reflected light via the yellow filter 28 for a time x/v, and then exposed to light for a time x/v without passing through the yellow filter 28.
W-x)/v will be exposed. This is equivalent to being exposed to red and green light for a time W/v and to blue light for a time x/v.

Therefore, only exposure to blue light is suppressed, resulting in color correction. Although only the suppression of the blue component has been described here, any color correction is possible by changing the insertion amounts of the yellow filter 28, magenta filter 29, and cyan filter 30, respectively.

Note that the present invention is not limited to the above-mentioned embodiments, and various modifications are possible.1 For example, the insertion position of each filter does not need to be directly below the slit hole, but may be inserted on the optical path other than between the principal points of the lens. It can be in any position. Further, the slit 13 is not necessarily necessary, and direct exposure without using the slit 13 is also possible by uniformizing the amount of irradiation light using a +77 rector or the like.

[Effects of the Invention 1] As is clear from the detailed description above, according to the present invention, arbitrary color correction can be performed at low cost without modifying the lens housing and regardless of the type of lens.

[Brief explanation of the drawing]

Figures 1 to 3 show an embodiment embodying the present invention; Figure 1 is a perspective view showing the optical system of this embodiment;
The figure is a sectional view showing the configuration of this embodiment, Figure 3 is a perspective view showing the configuration of the filter unit, Figure 4 is a diagram explaining the action of the filter, and Figure 5 is a block diagram showing the mechanism for controlling the filter unit.・It is a diagram. 14... Lens corresponding to the imaging means, 15... Document, 21... Control roller corresponding to the second moving means, 2
5... Filter unit that corresponds to the filter.

Claims (1)

[Scope of Claims] 1. Imaging means for forming an image of light from an original onto a photosensitive recording medium; and a first imaging means for moving the original relative to the imaging means.
a second moving means for moving the photosensitive recording medium relative to the imaging means in synchronization with the movement of the document; an exposure apparatus characterized by having a filter that is insertably arranged in an optical path from the original to the photosensitive recording medium except between the principal points of the image forming means so as to have uniform filtering characteristics. .