JPS6231902A - Manuscript lighting apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a document illumination device including an illumination lamp and a metal mirror.

[Prior art]

For example, in a copying apparatus such as an electrophotographic copying machine, a document illumination device is required to illuminate a copy document. An example of such an original illumination device is configured to mainly include a rod-shaped lamp and a condensing mirror to form an illumination area in the form of a long and narrow strip extending in the width direction of a document table made of transparent glass. By moving and scanning the table relative to the longitudinal direction, an optical image of the entire area of the copy document is projected onto the photoreceptor via the projection optical mechanism.

Conventionally, this type of document illumination device includes a partially emissive filament in which coiled light emitting parts and linear non-emissive parts are alternately arranged within a tubular enclosure made of, for example, quartz glass. It is constructed by disposing a long rod-shaped lamp, for example, facing a gutter-shaped condensing mirror so as to extend in its length direction.

[Problem that the invention seeks to solve]

Copied originals come in a variety of colors, such as black, blue, and red, and therefore a copying machine can produce good copied images with no difference in shading for all of these colors. However, due to the spectral characteristics of the rod-shaped lamp, optical lens system, photoreceptor, etc., generally speaking, the density of the copied image area corresponding to the blue-based or red-based part of the original is higher than that of the copied image area corresponding to the black-based part. Since the density tends to be considerably lower than the density, in conventional copying machines, the color can be adjusted by inserting an appropriate filter in the light path from the rod-shaped lamp to the photoreceptor to modify the spectral characteristics of the document illumination light. The correction is performed to compensate for the lack of density in the copied image portion corresponding to the blue-colored or red-colored portion of the original.

However, such filters are prone to dust and scratches, so they require great care when handling, and they require a holder, making assembly of the device cumbersome.
In addition, this type of filter usually has a multilayer structure, which is expensive and increases the manufacturing cost of the device, and furthermore, there are problems in that it has poor heat resistance.

[Purpose of the invention]

The present invention was made based on the circumstances such as INJ-, and its purpose is to provide an original illumination device that can correct the spectral characteristics of original illumination light and perform color correction with a simple and inexpensive configuration. It's about doing.

[Means for solving problems]

A document illuminating device of the present invention is a document illuminating device comprising an illumination lamp and a metal mirror, the mirror being a first
It consists of a reflective part and a second reflective part, the reflected light of the light projected onto the first reflective part from the illumination lamp is directed directly toward the document, and the reflected light of the light projected from the illumination lamp to the second reflective part The first reflective portion and the second reflective portion are fixed in position with respect to the illumination lamp so that the light is projected onto the first reflective portion, reflected, and then directed toward the document, and the first reflective portion has at least one of its reflective surfaces. It is characterized by having a layer made of a color correction film in part.

According to such a configuration, the metal mirror is made up of a first reflective part and a second reflective part, and further has a layer of a color correction film on at least a part of the reflective surface of the first reflective part, Of the light from the illumination lamp, the light directed toward the first reflection portion is reflected from this and then projected onto the document, and among the light from the illumination lamp, light directed toward the second reflection portion is reflected from this and then projected onto the document. Since the positional relationship between the mirror and the illumination lamp is defined so that the light is projected onto the first reflective part, reflected again, and then projected onto the original, the light illuminating the original is corrected by the layer made of the color correction film. Moreover, since the layer made of the color correction film is formed on one of the first reflective parts, the illumination light is lower than when the layer made of the color correction film is also formed on the second reflection part. As a result, the spectral characteristics of the document illumination light can be corrected by a simple and inexpensive structure in which a layer of a color correction film is formed on at least part of the reflective surface of the first reflective part. You can perform color correction using

Since the color correction film is provided on a metal mirror used in combination with an illumination lamp, the light from this metal mirror illuminates the original, allowing the desired image to be achieved without impairing the clarity of the original light image. Color correction can be achieved. On the other hand, when a mirror is provided to reflect the original optical image and a color correction film is provided thereon, the clarity of the original optical image is reduced due to the roughness of the color correction film.

〔Example〕

The present invention will be described in detail below with reference to the drawings.

FIG. 1 is an explanatory diagram showing an outline of an embodiment in which a document illumination device according to the present invention is applied to a copying machine, in which 1 is a charging mechanism, 2 is a document illumination device, 3 is a projection optical mechanism, and 4 5 is a developing mechanism, 5 is a transfer mechanism, 6 is a fixing mechanism, 7 is a static elimination mechanism,
8 is a cleaning mechanism, 9 is a transparent glass document table, 1
0 is a rotating drum-shaped photoreceptor.

The document illumination device 2 includes, for example, a rod-shaped illumination lamp 11;
For example, it consists of a gutter-shaped metal mirror 12 that is condensing. As shown in FIG. 2, the illumination lamp 11 includes a coil-shaped light-emitting part 14 made of, for example, tungsten, and a linear non-light-emitting part in a long rod-shaped tube-shaped enclosure 13 made of, for example, quartz glass. 15 are arranged alternately, and filament assemblies 16 are arranged so as to extend along a tube axis 17. 18.19 are internal wires 18.+9, one end of which is connected to both ends of the filament assembly 16, and the other end of which is connected to a metal foil 2, which will be described later.
0, 2] is connected to the inner end side. Reference numerals 20 and 21 denote metal foils made of, for example, molybdenum that are sealed within the flat end sealing portion, and the inside of the tube-shaped sealing body 13 is hermetically sealed with these metal foils 20 and 21. Reference numerals 22 and 23 denote external lead rods, and one end of each of these external lead rods 22 and 23 is connected to the metal foil 20.21, and the other end extends outwardly from the end sealing portion 24.25. ing.

26 is a supporter, 27 and 28 are end sealing parts 24, respectively.
, 25 are contacts held by adhesive inside the tubes of the heses 27 and 2B, respectively, and electrically connected to the external lead rods 22 and 23.

The mirror 12 includes, for example, a lower first reflective portion 31 and an upper second reflective portion 32 that are formed in one direction, and as schematically shown in FIG. The reflected light of the light projected onto the portion 31 is directed directly to the illumination area 40 of the document table 9 and from the lamp 11 to the second
The reflected light of the light projected onto the reflective portion 32 is projected onto the first reflective portion 31 and reflected, and then illuminated by the illumination area 40 of the document table 9.
The first reflective portion 31 and the second reflective portion 32 are fixed in position relative to the lamp 11 so as to face the lamp 11 . That is, the first reflective portion 31 has its central axis aligned with the lamp 11, for example.
an arcuate surface portion 33 whose cross section is approximately 1/4 arc, an elliptical surface portion 34 which extends from the edge of the arcuate surface portion 33 and whose cross section forms part of an ellipse; Surface part 3
4 and a planar flat portion 35 extending toward the document table 9 from the edge of the document plate 9 . The second reflective portion 32 has, for example, a center axis that coincides with the tube axis 17 of the lamp 11, a cross section of about 174 arcs, and a substantially semicircular arc shape due to the arcuate surface portion 33 of the first reflective portion 31. Arc surface portion 3 forming a surface
6, and a planar first portion extending from the edge of this circular arc surface portion 36.
, and a second planar portion 38 extending from the edge of the first planar portion 37 toward the document table 9 . The main material of the reflective surfaces of these first reflective portions 31 and second reflective portions 32 is, for example, aluminum or aluminum alloy, and for example, the entire reflective surface of one of the first reflective portions 31 is coated with a material for color correction. A layer 50 made of a film (hereinafter also simply referred to as a "color correction film layer") is formed.

The color correction film layer 50 may be formed by any means, and is not particularly limited. For example, the color correction film layer 50 may be formed by coloring aluminum or an aluminum alloy, which is the main material of the reflective surface, using an anodizing method. Obtainable. Specifically, alloy coloring methods using alloy components; natural coloring methods such as electrolytic solution coloring methods using electrolytes; dyeing methods that color the anodic oxide film with organic or inorganic dyes; An appropriate method such as an AC electrolytic coloring method in which the anodic oxide film is colored by AC electrolysis in an electrolytic solution containing an intermediate treatment, or a DC electrolytic coloring method in which the anodic oxide film is intermediately treated and then colored by DC electrolysis in an electrolytic solution containing a metal salt; can be formed by For example, in order to obtain a high-density copied image even when copying an original with a blue tone, the color tone of the color correction film layer 50 should be yellow, which is a complementary color to the blue tone. Therefore, when forming the color correction film layer 50 having a yellow color tone, for example, using an Al-Mn alloy (aluminum-manganese alloy) as the main material, as described in -L. A method can be used in which the first reflective portion 31 formed into a shape is anodized in an aqueous sulfuric acid solution.

41 and 42 are light-shielding plates, and these light-shielding plates 4L42 are fixedly provided to the copying apparatus main body (not shown) between the light projection opening 39 of the mirror 12 and the document table 9, and in this example, one side is A light shielding plate 41 extends deeply into the light projection opening 39 of the mirror 12 so as to block the light from the lamp 11 that is directed directly toward the illumination area 40 of the document table 9. By blocking the light from the lamp 11 that goes directly toward the illumination area 40 of the document table 9, substantially all of the light illuminating the illumination area 40 of the document table 9 is of the color of the first reflective portion 31. Since the light is reflected from the correction film layer 50, the color correction effect by the color correction film layer 50 becomes even more reliable.

Reference numeral 43 designates a metal lamp holder, which holds the lamp 11 under pressure from both ends via contacts 29 and 30, and supplies power from the power source to the lamp II via the lamp holder 43. . Reference numeral 44 denotes a holder fixed to the main body of the copying apparatus, and the mirror 12 is held and fixed on the side of the holder 44, and a lamp holder 43 is fixed to the holder 44 through an insulating material. , and the projection optical mechanism 3 is attached to this holder 44. 45 is a temperature fuse.

According to the embodiment described above, in the document illumination device 2, the metal mirror 12 is composed of the first reflective portion 31 and the second reflective portion 32, and the entire reflective surface of the first reflective portion 31 is provided with a color correction portion. A coating layer 50 is formed, and the light from the lamp 11 directed downward toward the first reflective portion 31 is reflected from the coating layer 50 and then projected onto the illumination area 40 of the document table 9. The mirror 12 and the lamp are arranged so that the light directed toward the upper second reflective section 32 is reflected from the second reflective section 32 and then projected onto the lower first reflective section 31, reflected again, and then projected onto the illumination area 40 of the document table 9. 11, and in addition, the light shielding plate is configured to block light from the lamp 11 that is directly directed toward the illumination area 40, so that all of the light illuminating the illumination area 40 of the document table 9 is The light is substantially reflected through the color correction coating layer 50 and is not adversely affected by the direct light from the lamp 11, so that the light illuminating the illuminated area 40 has the color tone of the color correction coating layer 50. Accordingly, it has spectral characteristics that are clearly corrected by 6, and in addition, the color correction film layer 50
Since it is formed on one of the first reflective portions 31, the attenuation of the amount of illumination light is smaller than when the color correction film layer is also formed on the second reflective portion 32. With a simple and inexpensive structure of forming the color correction film layer 50, such density can be obtained even when forming a copy image of an original having a color system such as a blue system, a red system, etc. that is likely to be accompanied by insufficient density. The original can be illuminated in such a way that a copy image of sufficient density can be formed without any deficiency.

Then, the color correction film layer 50 is formed by an anodizing method.
In this case, the color correction film layer 5o has excellent thermal durability and can stably exhibit color correction performance over a long period of time.

〔Effect of the invention〕

As described in detail below, according to the document illumination device of the present invention, the metal mirror includes a first reflective portion and a second reflective portion, and at least a portion of the reflective surface of the first reflective portion is It has a layer made of a color correction film, and the light from the illumination lamp directed toward the first reflection part is reflected from this and then projected onto the document, and the light from the illumination lamp is reflected from the second reflection part. The positional relationship between the mirror and the illumination lamp is defined so that the light directed toward the area is reflected from this area, projected onto the first reflecting area, reflected again, and then projected onto the original, so that the light illuminating the original is has the spectral characteristics corrected by the layer made of the color correction film, and since the layer made of the color correction film is formed on one of the first reflective parts, the second
Compared to the case where a layer made of a color correction film is also formed on the reflective part, the attenuation of the amount of illumination light is small, and as a result, at least a part of the reflective surface of the first reflection part is made of a color correction film. Color correction can be performed by modifying the spectral characteristics of document illumination light using a simple and inexpensive structure of forming layers. Therefore, even when forming a copy image of an original having a color system such as a blue system, a red system, etc. that is likely to be accompanied by insufficient density, it is possible to form a copy image with sufficient density without causing such insufficient density. becomes.

Since the color correction film is provided on a metal mirror used in combination with an illumination lamp, the light from this metal mirror illuminates the original, allowing the desired image to be achieved without impairing the clarity of the original light image. Color correction can be achieved. On the other hand, when a mirror is provided to reflect the original optical image and a color correction film is provided thereon, the clarity of the original optical image is reduced due to the roughness of the color correction film.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing an outline of an embodiment in which the document illumination device according to the present invention is applied to a copying machine, FIG. 2 is an explanatory cross-sectional view showing an example of an illumination lamp, and FIG. 3 is a metal FIG. 3 is an explanatory diagram schematically showing the direction in which light is projected by a manufactured mirror.

Claims (1)

[Scope of Claims] 1) An original illumination device comprising an illumination lamp and a metal mirror, wherein the mirror includes a first reflection part and a second reflection part, and the first reflection part is smaller than the illumination lamp. The reflected light of the light projected onto the second reflecting portion from the illumination lamp is directed directly toward the original, and the reflected light of the light projected onto the second reflecting portion from the illumination lamp is projected onto the first reflecting portion, reflected, and then directed toward the original. the first reflective portion and the second reflective portion are fixed in position with respect to the illumination lamp;
A document illuminating device, wherein the first reflective portion has a layer made of a color correction film on at least a portion of its reflective surface.