JPH09219769A - Illumination device, and original reader and reproducer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To evenly illuminate an original with high illuminance and to prevent occurrence of shadows of the original by diffusing and reflecting the luminous flux sent from a light source and illuminating the original from a point set right under it by means of a cylindrical member having a diffusion/reflection film. SOLUTION: The luminous flux sent from a light source 7 is led into a cylinder 2 from a reflector 8 through a 1st opening 4 for illumination of the interior of the cylinder 2. Then the luminous flux is repetitively diffused and reflected in the cylinder 2 via a diffusion/reflection film 3 after illumination of the inner wall of the cylinder 2, and the luminous flux is partly emitted through the openings 4 to 6 of the cylinder 2. The luminous flux emitted through the 2nd opening 5 is made incident on an original put on the contact glass 1. The 2nd and 3rd openings 5 and 6 are placed opposite to each other, and the information recorded on the original surface can be read by a reading optical system through the opening 6. The opening 5 is set at a position right under and very close to a reading position R. Furthermore, the even illumination is secured through the proper adjustment of width of the opening 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an illuminating device which is suitable for use as an illuminating technique for an original reading device in a scanner, a copying machine or the like, and an original reading / reproducing device including the illuminating device.

[0002]

2. Description of the Related Art As a conventional one of this type, Japanese Patent Publication Sho 6
The thing disclosed in the 3-33192 publication is known. The one disclosed in Japanese Patent Publication No. 63-33192 shows a structure for condensing a light beam from a linear or point light source to a reading position by using a plurality of elliptical or plane reflecting mirrors. Is. Currently, the illumination unit of a scanner using a linear light source such as a halogen lamp on the market has a configuration in which a plurality of elliptical mirrors are combined,
The basic idea has not changed.

[0003]

The features and problems of the document illumination system in the document reading apparatus will be described below. (1) Manuscript Illumination Method Using Fluorescent Lamp FIG. 33 shows a configuration example of an illumination system using a fluorescent lamp.
Fluorescent lamps have low power consumption, are inexpensive, and are the light sources used in most image reading devices. However, it is difficult to illuminate only the reading position efficiently because of the large fluctuation of the light quantity and the diffuse illumination. When the illuminance distribution on the document surface is measured, the area directly above the aperture (opening) of the fluorescent lamp is the brightest, and the illuminance is considerably reduced at the actual reading position, resulting in poor illumination efficiency. FIG.
In 3, 3, 30 is a fluorescent lamp, 31 is a document, 32 is a first traveling body mirror, 33 is a counter reflection plate, and 34 is a contact glass.

(2) Original Document Illumination Method Using Halogen Lamp FIG. 34 shows an example of the configuration of an illumination system using a halogen lamp. Although the halogen lamp 35 consumes a large amount of power, it is stable and can obtain a high illuminance on the original surface. Since the halogen lamp 35 is a linear light source, linear illumination is possible by using a reflector (reflecting plate) 36.
However, in reality, when the light flux is excessively narrowed, there are problems that the contact glass 34 as the document mounting means is cracked by heat and that high accuracy is required for installing the illumination system.

Further, since the reflector 36 is formed by bending a member made of high-brightness aluminum or the like, the influence of a shape error is reduced. Therefore, the design of the illumination system intentionally widens the illumination light and considerably lowers the illumination efficiency. is the current situation. If the capacity of the halogen lamp 35 is increased in order to increase the illuminance of the document surface by the amount of reduced illumination efficiency, damage such as damage to the document 31 due to generated heat occurs. Therefore, if the halogen lamp 35 is used to perform highly efficient illumination, the component cost and the installation cost are high. Also in FIG. 34, 32 is the first traveling body mirror,
Reference numeral 33 indicates a counter reflecting plate.

Further, what is common to both the fluorescent lamp and the halogen lamp is that the illuminating device is not directly below the reading position but in the sub-scanning direction so that the illuminating device does not interfere with the reading of the image by the imaging optical system. It had to be placed on that side. This means that the distance between the light source and the reading position must be increased, and the illumination efficiency is reduced, and if the reading position is illuminated from only one side in the sub-scanning direction, a shadow will occur when a document with a pasting is read. Therefore, in many document reading apparatuses, it is necessary to dispose a light source on one side as shown in FIGS. 33 and 34 and to dispose a mirror surface member called a counter reflection plate on the other side, which reduces cost. It also caused problems such as increasing the number.

The present invention has been made in view of the above circumstances, and in the illuminating device according to the first aspect, it is possible to illuminate the surface of the original uniformly and with high illuminance, and to prevent the shadow of the original from occurring. The purpose is to do.

Further, in the illuminating device according to the second aspect of the invention, it is an object of the present invention to reduce the mixing of diffused light from the inner surface of the cylinder into the image-forming light beam to enable high-quality reading.

Further, in the illuminating device according to the third aspect, it is possible to perform high-quality reading by reducing the mixing of diffused light from the inner surface of the cylinder in the image forming light beam to increase the illumination intensity of the original document and narrowing the illumination width. The purpose is to do.

Further, in the illuminating device according to the fourth aspect, the width of the opening on the side of the original which is not necessary to remove the diffused light or the width of the non-coated portion of the diffuse reflection film is minimized. By increasing the illuminance of the document surface, it is intended to enable high-quality reading.

Further, in the illuminating device according to the fifth aspect of the invention, it is an object to reduce the light flux that reflects from the document surface to the inside of the cylinder and illuminates the document surface again, thereby making it possible to perform high-quality reading. is there.

Further, in the illuminating device according to the sixth aspect, a part of the luminous flux emitted from the inside of the cylinder and illuminating the original surface illuminating a position apart from the reading position is reflected again toward the reading position. The purpose of this is to increase the illuminance at the reading position and enable high-quality document reading.

The illumination device according to a seventh aspect of the present invention has an object to increase the illuminance of the original surface to enable high-quality original reading.

Further, in the illuminating device according to the eighth aspect, it is possible to prevent unnecessary flare light from being generated and to use the light flux as a light flux which contributes to the illumination of the original, thereby enabling high-quality original reading. The purpose is.

Further, in the illumination device according to the ninth aspect, it is an object of the present invention to minimize the absorption of the light flux transmitted through the diffuse reflection film to increase the illuminance of the document surface and to enable high-quality document reading. To do.

In the illuminating device according to claim 1, wherein the second opening and the third opening are cylinders opposed to each other, when the distance between the illuminating device and the document surface is changed, the illuminance at the reading position is largely changed. To do. However, in order to suppress the variation in the distance between the illuminating device and the document surface, it is necessary to make the mounting accuracy and the structure of the device strong, resulting in high cost. Therefore, it is an object of the invention according to claim 10 to provide a lighting device which solves the problems of the lighting device according to claim 1.

In the illumination device according to the tenth aspect, when the reading is performed in an oblique direction and the opening for removing the specularly reflected light is newly provided on the cylinder, the loss of the light amount becomes large, and therefore the original document is increased. There is a problem that the amount of light that illuminates the surface decreases. Therefore, it is an object of the invention according to claim 11 to provide a lighting device which solves the problems of the lighting device according to claim 10.

It is an object of the invention of claim 12 to provide an illuminating device for which glossiness of a document is required.

It is known that when reproducing the color of an original document by a device such as a color copying machine, the optimum conversion from the read color signal to the output color signal differs depending on the original document type. Optimum color signal conversion is performed by the user specifying the type of document to be read.
Of course, a method for automatically discriminating the document type has been developed and put into practical use. However, in this case, whether the original type is determined has a continuous tone like a photograph, is a halftone image like printing, or has only two tones like letters. It was a judgment at the level. However, in future color copiers,
When it becomes necessary to copy a document more faithfully, it becomes necessary to faithfully reproduce even the glossiness of the document. That is, a glossy pattern must be read as glossy. Therefore, it is necessary to read the glossiness of the document as one of the document information.

However, in the illumination system generally used in the document reading apparatus at present, since the specular reflection light component from the document surface cannot be taken in, the glossiness cannot be obtained. Therefore, it is an object of the present invention to provide an illuminating device capable of obtaining the glossiness of a document.

Generally, it is well known that the impression when looking at a design differs depending on whether the design has gloss or not. However, no conventional copying machine faithfully reproduces the glossiness of the original. Therefore, it is an object of the present invention to provide a document reading / reproducing apparatus capable of executing an appropriate process according to the glossiness by obtaining the glossiness of the document and its distribution.

The glossiness is calculated for each pixel read,
When processing is performed according to glossiness, if the required glossiness varies from pixel to pixel due to stains on the surface of the document, stains on the contact glass, etc., the process will switch from pixel to pixel. There are times when you cannot obtain a good image. Therefore, it is an object of the present invention to provide an original reading / reproducing apparatus capable of high-quality image reading and image reproduction.

[0023]

To achieve the above object, the present invention (Claim 1) comprises a cylinder and an external light source, wherein the cylinder has a first opening through which light from the light source enters. A diffuse reflection film for diffusing and reflecting the light entering from the first opening, and a second opening for emitting the light diffused and reflected by the diffuse reflecting film to a document reading position on the document mounting means,
A third opening for emitting light to a reading optical system for reading the information written on the surface of the original is provided so as to face the second opening.

The width b of the second opening and the width a of the third opening are set such that b ≧ a.

In the width b of the second opening, the width a of the third opening, and the width c of the regions on both sides sandwiching the second opening and having no diffuse reflection film, c ≧ a> It is characterized in that it is set to be b.

Further, it is characterized in that light-shielding plates having a thickness and a height that do not interfere with image formation and document illumination are provided on both end faces of the third opening.

Further, the invention is characterized in that the inner surface of the cylinder is formed in a groove shape in the circumferential direction.

Further, a pair of reflectors is provided on both sides of the second opening so that diffused light emitted from the second opening and moving away from the original reading position is folded back toward the original reading position. It is a thing.

Further, a diffuse reflection film consisting of a cylinder and an internal light source, in which the cylinder diffuses and reflects the light from the light source, and the light diffused and reflected by this diffuse reflection film is placed on the original document mounting means. It has a first opening for emitting light to a reading position, and a second opening for emitting light to a reading optical system which is provided so as to face the first opening and reads information written on the document surface. It is characterized by that.

Further, a light shielding plate is provided on the light source so that direct light from the light source does not pass through the first opening and the second opening. Further, a mirror surface for suppressing absorption of a light beam is provided between the diffuse reflection film and the material surface of the cylinder.

With the above-mentioned structure, the light flux from the light source is diffused and reflected by the cylindrical member having the diffuse reflection film inside and the original is illuminated from directly below, so that the original surface is uniformly illuminated with high illuminance. can do. Also, the shadow of the original is not generated.

Furthermore, an illumination device according to claim 10 which solves the problems of the illumination device according to claim 1 comprises a cylinder and an external light source, and the cylinder has a first opening through which light from the light source enters. A diffuse reflection film for diffusing and reflecting the light entering from the first opening, a second opening for emitting the light diffused and reflected by the diffuse reflecting film to a document reading position on the document mounting means, and A third opening which is arranged at a position inclined from the position facing the second opening in the sub-scanning direction by a certain angle and emits light to a reading optical system for reading the information written on the original surface. The corresponding portion on the cylinder that is specularly reflected on the surface of the document mounting means and directly generates the light mixed in the light flux imaged by the reading optical system is the fourth opening or the non-reflecting member. It is a feature.

Furthermore, the illumination device according to claim 11 is characterized in that, in claim 10, the third or fourth opening is also used as a first opening for allowing light from a light source to enter the cylinder. And

Furthermore, an illumination device according to a twelfth aspect is characterized in that in the tenth aspect, the fourth opening can be opened and closed.

Furthermore, a thirteenth aspect of the present invention is a document reading / reproducing apparatus having the illuminating device according to the twelfth aspect, which is obtained by reading a document by closing the fourth opening of the illuminating device. No. 1 reading result, a second reading result obtained by opening the fourth opening of the illuminating device to read the original document, and a fourth reading result of the illuminating device closing the original document on the original document mounting means. It is characterized in that it has a glossiness calculating means for calculating the glossiness of the original from the third reading result obtained by reading in the unprotected state, and performs different processing for the parts having different glossiness.

Further, the invention according to claim 14 is an original reading / reproducing apparatus having the illuminating device according to claim 12, which is obtained by reading the original by closing the fourth opening of the illuminating device. No. 1 reading result, a second reading result obtained by opening the fourth opening of the illuminating device to read the original document, and a fourth reading result of the illuminating device closing the original document on the original document mounting means. The glossiness calculating means for calculating the glossiness of the original from the third reading result obtained by reading in the unprotected state, and the processing method to be executed are selected based on the glossiness obtained by the glossiness calculating means. The first processing method selecting unit and peripheral pixels adjacent to the target pixel are determined to perform the same processing as the target pixel by the first processing method selecting unit, and form a continuous region including a predetermined number of pixels or more. The same processing area presence determining means determines whether to, the selection of the processing method performed performed based on the result by the presence determining means of the same processing region 2
And a processing method selecting means of.

[0037]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment according to the present invention will be described below with reference to the drawings. FIG. 1 is a diagram for explaining the first embodiment, and shows an illuminating device and a document mounting means in a document reading device. Reference numeral 2 in the drawing is a cylinder having openings 4, 5, and 6, and a white diffuse reflection film 3 having high diffusivity and reflectance is formed on the inner surface thereof by means of coating or the like. The light flux emitted from the light source 7 is guided by the reflector 8 through the first opening 4 into the inside of the cylinder 2 to illuminate the inside. The light beam illuminating the inner wall of the cylinder 2 is repeatedly diffused and reflected inside the cylinder by the diffuse reflection film 3, and a part of the light beam is emitted from the openings 4, 5, 6 of the cylinder 2. Reference numeral 9 in the figure denotes a light shielding plate for preventing the light flux from the light source from directly illuminating the original surface.

The light flux emitted from the second opening 5 illuminates a document placed on the contact glass 1 as a document mounting means. The second opening 5 and the third opening 6 are arranged so as to face each other, and the information written on the document surface is read through the third opening 6 by a reading optical system not shown in the drawing. You can For convenience of explanation, the width of the opening is drawn larger than the size of the cylinder 2, but originally, by setting the area of the opening portion as narrow as possible compared to the area of the diffusion surface inside the cylinder, the opening portion is opened. The brightness at can be made higher.

Further, by using a diffuse reflection film 3 having a characteristic close to that of a perfect diffusion surface, the illuminance in the cylinder can be made uniform. Therefore, although there is no light flux from the first opening 4 and the third opening 6 on the end face of the second opening 5, a uniform illuminance distribution is created. Next,
Consider the illuminance distribution created on the document surface by the light flux emitted from the second opening 5. The light flux emitted from the second opening 5 is diffused light, and since there is no light flux component from the third opening 6 as described above, at the document reading position R in FIG. Maximum values having an illuminance higher than the illuminance are generated on both sides of the reading position R. This tendency becomes larger in proportion to the distance between the second opening 5 and the document surface, and becomes more remarkable as the width of the second opening 5 becomes narrower.

However, the second opening can be installed immediately below the reading position R and in a very close position, and by appropriately adjusting the width of the second opening 5,
It is possible to easily perform uniform illumination to the extent that reading accuracy is not a problem. A major feature of the present invention is that a substantial light source for illuminating the original can be regarded as being placed at the position of the second opening 5. That is, in the conventional illumination method, the light sources have to be arranged before and after the reading position so as not to interfere with the image formation. Therefore, the light source and the reading position are separated from each other, and the illumination efficiency is reduced. This was particularly noticeable in the case of fluorescent lighting.

If the original illuminating device of the present invention is used, the second opening 5 which is a substantial illumination light source can be arranged immediately below the reading position R on the original surface and in a very close position. Therefore, it is possible to illuminate a certain width uniformly with a high illuminance around the reading position, and it is possible to read a pasted document without causing a shadow.

FIG. 2 shows a case in which the first embodiment is applied to a moving document reading apparatus, and a light beam from a light source is guided to a cylinder 2 by using an optical fiber 10. In FIG. 2, 11 is a pressure roller and 12 is a document feeding roller. FIG. 3 is a sketch of a part of the cylinder 2 in this embodiment.

FIG. 4 illustrates a second embodiment different from the first embodiment shown in FIGS. When reading the information of the original through the second opening 5 and the third opening 6, the luminous flux emitted from the third opening 6 includes the luminous flux reflected from the original surface and the diffused light multiply reflected in the cylinder 2.

In order to read a high-quality image, it is necessary to take in only the light flux reflected from the document surface into the imaging lens without including the diffused light multiply reflected in the cylinder 2 and to form an image on the photoelectric conversion element. There is. Also, the second opening 5 and the third
The minimum aperture width required for the aperture 6 is a width that does not prevent the lens from capturing reflected light from the document. In this sense, the minimum width of the second opening 5 near the document surface is narrower than that of the third opening 6. Therefore, considering the case of b <a, a part of the light beam reflected by the inner wall of the cylinder 2 adjacent to the second opening 5 is partially or parallel to the optical axis of the imaging optical system at an angle of the third light beam. There is a light beam that passes through the aperture 6.
Such a light flux is almost difficult to separate from the light flux from the document to be read, and deteriorates the read image quality as flare light (flare light having an angle with respect to the optical axis has a slit or the like installed in the optical path. It can be removed).

Therefore, the second embodiment is characterized in that the opening width b of the second opening 5 is made wider than the width a of the third opening 6, thereby reducing the above-mentioned flare light. It becomes possible.

FIGS. 5 and 6 are for explaining a third embodiment different from the second embodiment described with reference to FIG.
In the second embodiment, the flare light is reduced by making the width of the second opening 5 wider than that of the third opening 6. However, by increasing the width b of the second opening 5, The brightness in the second opening 5 decreases. On the other hand, the optimization of the illuminance and its distribution on the document surface depends on the distance between the document surface and the cylinder 2, as described above. Here, consider a case where the first embodiment is applied to the original moving type reading apparatus shown in FIG. In this case, since the original and the second opening 5 are in contact with each other, the most uniform and high illuminance proof can be performed.
In order to perform high-quality reading, it is ideal to illuminate only the reading position R with high illuminance and not certify other than the reading position. This can be realized by narrowing the width of the second opening 5. is there. However, as described in the second embodiment, when the width b of the second opening 5 becomes narrower than the width a of the third opening 6 (b <a), the flare light deteriorates the reading quality.

In FIG. 5, the second opening 5 (width b) is the third
The opening 6 is narrower than the opening 6 (width a). But,
By forming a region (c> a) having a width c on both sides of the second opening 5 with the diffuse reflection film 3 not applied,
As in the second embodiment, it is possible to prevent flare light from being mixed into the image forming light beam. As a result, in the document moving type document reading apparatus shown in FIG. 2, the illumination width can be narrowed and high illuminance illumination can be performed.

FIG. 6 shows that a light shield having an opening width b (b <a) narrower than the third opening made of a separate member is provided directly above the second opening 5 having a width wider than the third opening 6. The same effect can be obtained by installing the plate 13 and setting the substantial width of the second opening 5 to b. At this time, the portion 14 where the diffuse reflection film 3 is not applied is subjected to black treatment so as to hardly reflect light, or such a black member is applied or adhered, thereby further suppressing flare light generation. Can be increased.

7 and 8 are for explaining the fourth embodiment. In the second and third embodiments described above, as a method of reducing flare light in the illumination system of the first embodiment, the width of the second opening 5 is widened or a diffuse reflection film is partially applied. It was not. If the effective area of the diffuse reflection film inside the cylinder 2 is excessively reduced by these methods, the average reflectance inside the cylinder decreases and the light amount loss increases, so that the illuminance on the document surface decreases.

In order to avoid this, the width of the second opening 5 shown in the second and third embodiments, or the non-coated area of the diffuse reflection film 3 on the inner wall of the cylinder that sandwiches the second opening 5 is formed. The width is set to be equal to or slightly wider than the width of the third opening 6, and the light shielding plate 15 in FIG. It is possible to remove flare light components having a close angle. As a result, a reduction in the illuminance on the original surface can be suppressed to a minimum, and flare light components that are difficult to remove even if a slit or the like is installed in the optical path can be reduced, so that higher-quality original reading can be performed.

The shaded portion 103 in the figure is the second opening 5
From the point A on the diffusion surface of the inner wall of the cylinder closest to
The components of the light flux passing through the opening 6 are blocked by the light shielding plate 15. The straight line A-B is the light beam having the slowest angle (close to the optical axis) among the light beams passing through the opening 6 when there is no light shielding plate, and the straight line A-C passes through the opening 6 when the light shielding plate is installed. It is a light beam with the slowest angle (close to the optical axis) among the light beams. Further, the surface sandwiched between the pair of light-shielding plates 15 is subjected to black treatment so as to reduce the reflection of light, and a diffuse reflection film is provided on the surface opposite to the black-treated surface inside the cylinder. By applying the same reflection film as in No. 3, it is possible to prevent the reduction of the illuminance of the original surface. The same applies to FIG.

FIG. 9, FIG. 10 and FIG. 11 explain the fifth embodiment. When original illumination is performed by multiple diffuse reflection on the inner surface of the cylinder according to the first embodiment, the light flux diffused and reflected on the original surface may be diffusely reflected on the inner surface of the cylinder and may illuminate the original surface again. Such luminous flux will be referred to as retroreflected light here. If there are too many retroreflected light components, the output level of the black line in a solid white will be higher than it actually is, or the output level of the white line in a solid black will be lower than it actually is, and the read quality will be greatly reduced. .
When focusing on one point in the main scanning direction, in order to reduce the influence of the retroreflected light at this point, it is necessary to prevent the retroreflected light from the area other than the illuminated target point. The purpose of the fifth embodiment is to suppress the generation of such retroreflected light components and perform high-quality reading.

That is, FIG. 10 is an enlarged view of a part D of the inner wall of the cylinder 2 used in the first to fourth embodiments.
As shown in FIG. 10, a fine groove-like structure having irregularities in the circumferential direction of the cylinder 2 is formed. The shape of the concave and convex grooves is shown as a shape in which the edges of the groove are right angles (FIG. 10) and a trapezoidal shape (FIG. 11), but is not limited to this. Also,
The depth of the groove and the pitch of the unevenness should be optimized in consideration of the distance from the document surface, the width of the opening, the required document surface illuminance, and the amount of retroreflected light to be suppressed.

Due to the groove on the inner wall of the cylinder, a part of the reflection component in the main scanning direction of the light beam which first enters the cylinder through the first opening 4 and is diffused and reflected by the concave portion of the groove is blocked by the convex portion. Also, while this repeats reflection, one
Most of the light flux that illuminates a point exists in a cross section that passes through one point of interest and is perpendicular to the main scanning direction. Since a general document is not a perfect diffusing surface, the light flux reflected on the document surface in the main scanning direction decreases depending on the illumination direction.

When the light beam reflected on the original surface in the main scanning direction is also reflected on the cylindrical surface, a part of the reflection component in the main scanning direction of the light beam diffused and reflected by the concave portion of the groove is similar to the above. Since it is hindered by the convex portion, the retroreflected light component is further reduced. The groove-like structure of this embodiment includes a microscopic pattern that is generally called a grating from a groove as shown in a macroscopically microscopic manner, and the gist of the invention is a cylinder oriented in the circumferential direction. It is intended to regulate the diffusion direction on the inner surface of the cylinder within the cross section of the cylinder by the pattern repeated in the longitudinal direction.

FIG. 12 illustrates the sixth embodiment. The illuminance distribution in the main scanning direction on the document surface tends to be high at the center and low at both ends. This is because the illumination light flux exists from both sides in the main scanning direction near the center,
This is because there is only one side near both ends. Even if shading correction is performed, the illuminance distribution on the document surface causes a decrease in S / N. Therefore, uniform illumination in the main scanning direction as much as possible is important for high-quality reading. . FIG. 12 shows any of the openings 4, 5, and 6 provided in the cylinder 2 shown in FIG. 1 so that the illuminance distribution on the sensor that performs photoelectric conversion when reading a document having a uniform density distribution becomes uniform. This is an example in which a part of the illumination light flux or the imaging light flux is shielded, and the shape is set narrow at the central portion and wide at both end portions.

13 and 14 relate to a method of manufacturing the cylinder 2 having a groove on the inner wall. Forming concentric circular grooves on the inner surface of a cylindrical member is difficult in processing and increases the cost of parts. Then, the manufacturing method is shown below.
First, the cylinder 2 used in the first to sixth embodiments is divided into three members p1, p2, p3 divided by three openings. The members p1, p2, and p3 may actually be divided cylinders or may be made of different members, and the present invention is not limited thereto. Next, a groove is formed by cutting on the side surface corresponding to the inner wall of the cylinder of each member p1, p2, p3. The members p1, p2, p3 having the grooves are formed on the inner wall of the diffuse reflection film 3 by means such as coating, and then the members p1, p2, p2, The p3 is fixed so as to have the same shape as the cylindrical member 2. In FIG. 13, the cylindrical member 51 and the members p1, p2, p3 are provided with screw holes so as to be fixed by screws. In this example, the fixing method is not limited, but in addition to fixing by screws, fixing may be performed by adhesion. FIG.
Shows the state of the inner surface of the member p1 in which the groove is formed.

The following will describe another manufacturing method. The problem of the method of manufacturing the cylinder 2 having the groove on the inner wall is that the number of parts is large. A spiral groove is formed on the inner wall of a cylinder (not shown). Generally, the spiral groove is exactly the same as when cutting a screw, it is easy to process, and the processing cost is low. After that, the reflection film on the inner surface is applied and the openings are formed. This manufacturing method is characterized in that a spiral groove is formed on the inner surface of the cylinder, and the order of other steps is not particularly specified.

15 and 16 are for explaining the seventh embodiment. Most of the light flux traveling from the second opening 5 toward the document surface is a light flux diverging in the front-back direction of the sub-scan with respect to the reading position R. By installing a pair of reflecting plates 16 on both sides of the second opening 5, the diffused light which is emitted from the second opening 5 and moves away from the document reading position R can be folded back toward the document reading position R, so that reading can be performed. It is possible to illuminate the vicinity of the position with higher illuminance. FIG.
6 is an example in which the reflector 16 is used in combination with the light shield plate 13 for substantially narrowing the width of the second opening 5 described in FIG.

17 and 18 are for explaining the eighth embodiment. In FIG. 17, since the light source 7 is installed inside the cylinder 2, only the first opening 21 and the second opening 22 are provided and the opening 4 is not provided. As a result, it is possible to eliminate the light amount loss due to the opening 4 and the light amount loss that occurs when the light flux from the light source 7 is guided to the inside of the cylinder 2, so that it is possible to perform illumination with higher illuminance. The light source 7 must be arranged at a position that does not obstruct the optical path of the imaging optical system. The type of the light source 7 is not limited to this embodiment, but may be a linear light source extending in the main scanning direction or a plurality of single light sources arranged in the main scanning direction. Moreover, a plurality of linear light sources may be installed as shown in FIG.

FIG. 19 illustrates the ninth embodiment. When the light source 7 is arranged inside the cylinder 2 in the eighth embodiment, the direct light from the light source 7 illuminates a position on the document surface which is not related to reading, and extra flare light is generated or an image is formed. There may be a problem that light is directly mixed into the optical system. In order to avoid this, the light shielding plate 17 is installed on the side of the first opening 21 and the second opening 22 with respect to the light source 7, and the direct light from the light source 7 causes the first opening 21 and the second opening 22 to pass. I did not let it pass. By coating the surface of the light shielding plate 17 with the diffuse reflection film 3, it is possible to prevent the reduction of the illuminance of the document surface due to the light shielding plate 17.

FIG. 20 illustrates the tenth embodiment. By setting the back surface of the diffuse reflection film 3 formed on the inner wall of the cylinder 2 described in the first to ninth embodiments by means of coating or the like, that is, the portion sandwiched between the reflection film 3 and the cylinder 2 as the mirror surface 18, The light flux transmitted through the diffuse reflection film 3 and absorbed by the cylinder 2 can be minimized. As a result, it is possible to minimize the light amount loss inside the cylinder, and it is possible to perform illumination with higher illuminance. Thereby, it is not necessary to make the diffuse reflection film 3 thicker than necessary, and the absorption by the diffuse reflection film 3 itself can be minimized.

A halogen lamp is often used as a light source for illuminating a document because it can obtain a high light amount, but most of its spectral components are in the infrared region, and the heat generation is large and the document is greatly damaged. In order to avoid this, by mixing powder of a medium that absorbs visible light, such as heat absorbing glass, and absorbs infrared light into the diffuse reflection film 3, the infrared component of the light flux that illuminates the document surface. To reduce
It is possible to prevent the document from being damaged by heat. Of course, as for the spectral reflectance characteristic of the diffuse reflection film 3 itself, it is desirable to select a member having a small absorption in the visible region and a large absorption in the infrared region.

FIG. 21 is for explaining the eleventh embodiment and shows an illuminating device and a document mounting means in the document reading device. In the figure, 2 is a first opening 4, a second opening 5, a third opening 6, and a fourth opening 6.
It is a cylinder having a, and a white diffuse reflection film 3 having high diffusivity and reflectance is formed on its inner surface by means such as coating.

The light beam emitted from the light source 7 is guided by the reflector 8 into the cylinder 2 through the first opening 4 and illuminates the inside. The light flux illuminating the inner wall of the cylinder 2 is repeatedly diffused and reflected by the diffuse reflection film 3 inside the cylinder 2, and a part of the light flux is emitted from the openings 4, 5, 6, 6a. Second opening 5
The light flux emitted from illuminates the document placed on the contact glass 1 as the document placing means. The second opening 5 and the third opening 6 are arranged at a position inclined by a predetermined angle θ from the facing position. Through this third opening 6,
Information written on the document surface can be read by a reading optical system (not shown).

The fourth opening 6a corresponds to the contact glass mixed with the image-forming light beam and the cylindrical inner surface portion for generating the specular reflection light component on the original surface. By making this portion an opening, By removing the reflected light component, the document information can be read correctly. Therefore, at the installation position of the opening 6a, the angle 6 formed by the optical axis of the light flux imaged by the reading optical system with respect to the perpendicular line drawn from the reading position with respect to the document surface and the same angle θ with respect to the perpendicular line are set. And the opening 6a
The aperture width of is determined by the angle of view η of the imaging light flux.

FIG. 22 shows the effect of the eleventh embodiment (FIG. 21) in comparison with the problem of the first embodiment (see FIG. 1) shown in FIG. In FIG. 22, the position of the document surface is A
3 shows a relative illuminance distribution on the document surface when the distance between the illumination device including the cylinder 2 and the light source 7 and the document surface changes from B to B. In contrast, FIG. 23 shows
The third opening 6 for reading the information written on the document surface by the reading optical system was provided at a position facing the second opening 5, and the distance between the illumination device and the document surface in the illumination system changed. In this case, the relative illuminance distribution on the document surface is shown. The illuminance distribution indicated by the dotted line in FIG. 23 shows the illuminance distribution created on the document surface by the light beams from the right and left portions of the cylinder with the reading position in the figure as the boundary.

In the case of the illuminating device shown in FIG. 23, since the openings 5 and 6 exist immediately below the document reading position, there is no illumination light beam from the direction directly below, and the reading position is from the inside of the left and right cylinders in the figure. Illuminated by diffusely reflected light. Therefore, in the illuminance distribution created by the left and right parts of the cylinder on the document surface, the peak position of the illuminance moves laterally as the distance between the illumination device and the document surface increases, as indicated by the dotted line. Therefore, there is a problem that the document reading position becomes a valley of the illuminance distribution.

On the other hand, in the document illuminating device shown in FIG. 21, the diffusely reflected light flux from the cylindrical portion surrounded by the openings 6 and 6a illuminates the document reading position most directly below. Therefore, as shown in FIG. 22, even if the distance between the illuminating device and the document surface changes, the peak position of the illuminance does not change, and the reading position can always be illuminated with high illuminance. .

FIG. 24 is a diagram for explaining the twelfth embodiment. In this embodiment, in order to prevent the light flux emitted from the fourth opening 6a from becoming stray light and being mixed into the imaging optical system, the trap 6b having an inner wall made of a black member is formed in the opening 6b.
It is provided outside a. The reason why the opening 6a is provided is to prevent the specularly reflected light components from the contact glass and the document surface from being mixed in the image forming light beam, so that the opening 6a is not necessarily provided in the cylinder 2. That is, the cylinder 2
It is possible to employ a means such as not forming a diffuse reflection film at a position corresponding to the opening 6a of the inner wall of, or forming a thin film made of a black member having a low reflectance at the above position. The effect is obtained.

FIG. 25 is a diagram for explaining the thirteenth embodiment. In this embodiment, the light flux from the light source 7 is guided into the cylinder 2 through the opening 6a by the reflector 8.
Illuminate the interior. The light beam illuminating the inner wall of the cylinder 2 is repeatedly diffused and reflected inside the cylinder by the diffuse reflection film 3, and a part of the light beam is emitted from the openings 5, 6, 6a. The light flux emitted from the second opening 5 illuminates the document placed on the contact glass 1 as the document mounting means. The second opening 5 and the third opening 6 have a predetermined angle θ from the position where they face each other.
It is arranged only at the inclined position. The information written on the document surface can be read through the third opening 6 by a reading optical system not shown in FIG.

FIG. 26 is a diagram for explaining the 14th embodiment. In this embodiment, the incidence of light inside the cylinder 2 is
This is done through the opening 6.

In the embodiment of FIG. 21, four openings are provided in the inner wall of the cylinder 2, and in the embodiment of FIG. 24, three openings and a non-reflective member having the same effect as the openings are provided in the inner wall of the cylinder 2. Therefore, as compared with an illuminating device having only three openings on a cylinder as shown in FIG. 23, the loss of light is large, and the amount of light illuminating the document surface is reduced after all. On the other hand, FIGS.
In the embodiment shown in FIG. 6, the number of openings formed in the cylinder is the same as that of the illumination device of FIG. 23, and therefore, it is possible to obtain the same document surface illuminance as that of the illumination device of FIG.

FIG. 27 is a diagram for explaining the fifteenth embodiment. In this embodiment, the luminous flux from the light source 7 is made incident on the inside of the cylinder 2 via the reflector 8 so that the illumination device does not become too large.

28 and 29 are views for explaining the 16th embodiment. The openings 6 and 6a have the same role as the openings 6 and 6a in FIG. That is, the opening 6 is for reading the information of the original by the reading optical system, and the opening 6a is for preventing the specular reflection light from the contact glass and the original surface from being mixed in the light flux imaged by the reading optical system. Is. A lid 19 that closes the opening 6a and that can be opened and closed is attached to the opening 6a. Like the cylinder 2, the diffuse reflection film 3 is formed on the inner surface side of the cylinder of the lid 19 by means such as coating.

Now, let Io be the output value when the document is read with the lid 19 open (FIG. 28). This is a value that does not include the specularly reflected light components from the contact glass and the original. Next, the output value when the lid 19 is closed (FIG. 29) and the same document is read is set to Is. Is is Io
Can be considered as the sum of the specular reflection light component Ic from the contact glass and the specular reflection light component Ig from the document.
That is, it can be expressed as Is = Io + Ic + Ig.

Since Ic is constant regardless of the original, it is measured and stored in advance. The value obtained by subtracting the above Ic from the value Is read with the lid 19 closed is Io + Ig.
Becomes Ig changes depending on the glossiness of the document surface. Therefore, the glossiness of the original can be known by obtaining the ratio of Io and (Io + Ig). By knowing the glossiness of the document to be scanned and how it changes, whether the document is a photo, if it is a photo is glossy or semi-glossy, and even if the photo is partially pasted on a normal document You can get information such as whether it is rare.

FIG. 30 shows a seventeenth embodiment (reading a document,
28 and 29 are diagrams for explaining the reproduction device).
6 is a flowchart in the case where the glossiness T of the document is detected by using the document illumination device and the different processing is performed depending on the glossiness T. First, the lid 19 is closed and the first reading scan is performed to read the value Is including the specular reflection light component. The read result is temporarily stored in the memory. Subsequently, the lid 19 is opened and the second reading scan is performed. The value read at this time is Io. Separately, the read value Ic when the document is not placed on the document mounting means (contact glass) and the lid 19 is closed is measured and stored. Using the above Is, Io, and Ic, the glossiness T is T = (Is-I
c) / Io.

In FIG. 30, the value of T is an appropriate set value N1,
Three cases depending on N2: T <N1, N1 ≦ T
≦ N2, T> N2, and different processing (processing 1, processing 2, processing 3) is performed according to each class. It should be noted that although FIG. 30 classifies into three cases, the present invention is not limited to this.

FIG. 31 shows the eighteenth embodiment (original reading /
28 and 29 are diagrams for explaining the reproduction device).
6 is a flowchart in the case where the glossiness T of the document is detected by using the document illumination device and the different processing is performed depending on the glossiness T. In the document reading / reproducing apparatus shown in FIG. 30, which calculates the glossiness for each pixel read and performs processing according to the glossiness, the calculated glossiness is determined by the stains on the surface of the document or the contact glass. If it changes for each pixel, the process may switch for each pixel, and an appropriate image may not be obtained. The embodiment shown in FIG. 31 eliminates this problem.

That is, in FIG. 31, when the processing is varied according to the glossiness obtained for each pixel, the processing when the glossiness falls within a specific range (N1 ≦ T ≦ N2 in FIG. 31) is the standard processing. (Processing 2 in FIG. 31). When the glossiness of the pixel of interest does not fall within the above range (T <N1, T> N2 in FIG. 31), the glossiness of the pixels around the pixel of interest is searched for, and the class of the pixel in the same category as the pixel of interest is searched. It is determined whether or not the divided pixels are continuous and have an area equal to or larger than a predetermined number of pixels, and if they are, the processing unique to each class described above (processing 1 and processing 3 in FIG. 31) is performed. , Otherwise, standard processing (see FIG.
Then, process 2) is performed.

FIG. 32 relates to the embodiment of FIG. 31 and shows the areas where the processes 1, 2, and 3 are to be discriminated from the glossiness of the read original according to the flowchart of FIG.

In the embodiment shown in FIG. 30 and the embodiment shown in FIG. 31, the processing is varied depending on the glossiness, but the following processing can be considered in this case. That is, (1) various originals with different gloss [for example,
A different color conversion matrix is created for photographs (gloss / semi-gloss / silk) and printing (coated paper, newspaper, etc.), and these are switched according to the gloss level to perform color conversion, (2) A process such as partially laminating (for example, laminating process 1 and process 3 in FIG. 32) according to the glossiness can be performed.

[0084]

As described above, according to the illumination device of the first aspect of the present invention, the luminous flux from the light source is diffused and reflected by the cylindrical member having the diffuse reflection film inside, and the original document is directly below. Since it is illuminated from above, it is possible to illuminate the document surface uniformly and with high illuminance, and also to prevent the shadow of the document from occurring.

According to the illumination device of the second aspect of the present invention, if the opening width on the side for illuminating the original is set wider than the opening width on the lens side, the image-forming light beam is diffused from the inner surface of the cylinder. Can be reduced and high-quality reading can be performed.

According to the illumination device of the third aspect of the present invention, the width of the opening on the side of illuminating the document surface is set narrower than the opening width on the lens side, and the lens side is centered on the opening on the document surface side. Since a diffuse reflection film is not formed over a range wider than the aperture width of, the mixture of diffused light from the inner surface of the cylinder can be reduced in the image-forming light flux, and the illuminance of the original document can be increased and the illumination width can be narrowed down. Various readings are possible.

Further, according to the illuminating device of the fourth aspect of the present invention, since the light shielding plate is provided at the aperture on the imaging lens side to shield a part of the diffused light entering the lens from the inside of the cylindrical member, It is possible to minimize the width of the opening on the document surface side that is required to remove the diffused light more than necessary or the width of the non-coated portion of the diffuse reflection film, and increase the illuminance of the document surface. It enables high-quality reading.

According to the illuminating device of the fifth aspect of the present invention, since the inner surface of the cylindrical member is formed in a groove-like structure in the circumferential direction, it is reflected from the document surface to the inside of the cylinder and again the document surface. It is possible to reduce the luminous flux that illuminates, and it is possible to read with high quality.

Further, according to the illuminating device of the sixth aspect of the present invention, since the reflecting plates are installed on both sides of the opening for illuminating the original of the cylindrical member, the luminous flux which is emitted from the inside of the cylinder and illuminates the original surface. A part of the light flux that illuminates a position apart from the reading position can be reflected again toward the reading position, and the illuminance at the reading position can be increased and high-quality document reading can be performed.

Further, according to the illumination device of the seventh aspect of the present invention, since the light source is installed inside the cylinder, the illuminance on the original surface can be increased and high-quality original reading can be performed.

According to the eighth aspect of the present invention, among the light fluxes from the light source placed inside the cylinder,
Since a plate that blocks the light flux that directly passes through the aperture from the light source that does not contribute to the document illumination and image formation is disposed, it is possible to prevent the generation of unnecessary flare light and to make those light fluxes that contribute to the document illumination. Therefore, high-quality document reading can be performed.

Further, according to the illumination device of the ninth aspect of the present invention, since the back surface of the diffuse reflection film formed on the inner surface of the cylinder is a mirror surface, absorption of the light flux transmitted through the diffuse reflection film is minimized. Therefore, the illuminance of the document surface can be increased, and high-quality document reading can be performed.

Further, according to the illuminating device of the tenth aspect of the present invention, in the illuminating device of the first aspect, the third opening for reading the document by the reading optical system is located immediately below the document reading position. Is placed at a predetermined angle from just below the original reading position so that the original can be read from an oblique direction, and further on the original mounting means mixed in the reading light beam or the portion on the cylinder where the regular reflection light from the original surface is generated. Since the opening is provided or the cylindrical upper portion is formed of a member that does not diffuse and reflect light, the original reading portion is illuminated from directly below, so that even if the distance between the original surface and the illuminating device fluctuates, the reading position can be changed. It is possible to suppress fluctuations in illuminance to a low level and solve the problem of the lighting device according to the first aspect. Therefore, a high-performance document reading device can be obtained at low cost.

Further, according to the illumination device of the eleventh aspect of the present invention, the opening for allowing the light beam from the light source to enter the inside of the cylinder is the third opening for reading the original by the reading optical system, or the reading. The fourth opening for preventing the specular reflection light from being mixed into the light flux is also used, so that it is possible to reduce the loss of the amount of light that is emitted from the inside of the cylinder and illuminates the document surface. The original can be illuminated with a higher illuminance than that of the illumination device, and therefore, it is possible to perform higher-quality original reading.

Further, according to the illuminating device of the twelfth aspect of the present invention, since the fourth opening of the cylinder can be opened and closed by the lid, the original document is read without using a light source and a sensor different from those for reading the original document. The glossiness of can be obtained. Therefore, by using this illuminating device, you can read originals with high fidelity and high quality including the glossiness of the originals.
It can be reproduced.

Further, according to the document reading / reproducing apparatus of the thirteenth aspect of the present invention, since the processing is made different depending on the calculated glossiness, the image reproduction optimum for the glossiness of the document can be performed. This enables faithful and high-quality document reading and reproduction, including the glossiness of.

Further, according to the document reading / reproducing apparatus of the fourteenth aspect of the present invention, the standard processing is performed only when the pixels having the glossiness within the predetermined range have a continuous area consisting of a predetermined number of pixels or more. Since it is configured to perform processing different from that described above, stable processing resistant to noise such as dirt can be performed, and high-quality document reading / reproduction is possible.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a first embodiment (illumination device) according to the present invention.

FIG. 2 is an explanatory diagram when the first embodiment is applied to a mobile reading device.

FIG. 3 is a perspective view of the first embodiment.

FIG. 4 is an explanatory diagram of a second embodiment (illumination device) according to the present invention.

FIG. 5 is an explanatory view of a third embodiment (illumination device).

FIG. 6 is an explanatory view of a modification of the third embodiment.

FIG. 7 is an explanatory diagram of a fourth embodiment (illumination device).

FIG. 8 is an explanatory view of a modification of the fourth embodiment.

FIG. 9 is a perspective view of a cylinder for explaining the fifth embodiment (illumination device).

FIG. 10 is an explanatory view of the main part of the fifth embodiment.

FIG. 11 is an explanatory diagram of a main part of a modified example of the fifth embodiment.

FIG. 12 is also an explanatory diagram of a sixth embodiment (illumination device).

FIG. 13 is a perspective view showing a method for manufacturing the same cylinder.

FIG. 14 is a perspective view of a cylindrical member of the same.

FIG. 15 is also an explanatory diagram of a seventh embodiment (illumination device).

FIG. 16 is an explanatory view of a modified example of the seventh embodiment.

FIG. 17 is an explanatory diagram of an eighth embodiment (illumination device).

FIG. 18 is an explanatory view of a modified example of the eighth embodiment.

FIG. 19 is also an explanatory diagram of a ninth embodiment (illumination device).

FIG. 20 is an explanatory view of a tenth embodiment (illumination device).

FIG. 21 is also an explanatory diagram of the eleventh embodiment (illumination device).

FIG. 22 is an explanatory diagram of effects of the eleventh embodiment.

FIG. 23 is a diagram illustrating a problem of the first embodiment (FIG. 1).

FIG. 24 is an explanatory diagram of a twelfth embodiment (illumination device) according to the present invention.

FIG. 25 is an explanatory diagram of a thirteenth embodiment.

FIG. 26 is an explanatory view of the fourteenth embodiment.

FIG. 27 is an explanatory view of the fifteenth embodiment.

FIG. 28 is an explanatory diagram of a 16th embodiment of the present invention.

FIG. 29 is likewise an explanatory view of the 16th embodiment.

FIG. 30 is a flowchart for explaining the seventeenth embodiment (original reading / reproducing device).

FIG. 31 is a flow chart for explaining the eighteenth embodiment (original reading / reproducing apparatus).

FIG. 32 is an explanatory diagram of Example 18 similarly.

FIG. 33 is an explanatory diagram according to a conventional technique.

FIG. 34 is an explanatory diagram according to another conventional technique.

[Explanation of symbols]

 1 Contact Glass 2 Cylinder 3 Diffuse Reflecting Film 4 First Opening 5 Second Opening 6 Third Opening 6a Fourth Opening 6b Trap 7 Light Source 8 Reflector 9 Light Shielding Plate 10 Optical Fiber 11 Pressure Roller 12 Original Feeding Roller 13 Light-shielding plate 14 Area where no reflection film is applied 15 Light-shielding plate 16 Reflecting plate 17 Light-shielding plate 18 Mirror surface 19 Lid 21 First opening 22 Second opening a, b, c Aperture width R Original reading position θ angle η Imaging light flux Angle of view

Claims (14)

[Claims] 1. A first opening formed of a cylinder and an external light source, wherein the cylinder receives light from the light source, and a diffuse reflection film for diffusing and reflecting the light entering from the first opening, A second opening for emitting the light diffused and reflected by the diffuse reflection film to the original reading position on the original mounting means, and for reading the information written on the original surface provided opposite to the second opening. And a third opening for emitting light to the reading optical system. 2. The lighting device according to claim 1, wherein the width b of the second opening and the width a of the third opening are set such that b ≧ a. 3. In the width b of the second opening, the width a of the third opening, and the width c of the regions on both sides sandwiching the second opening and having no diffuse reflection film, c ≧ a> The lighting device according to claim 1, wherein the lighting device is set to be b. 4. A light-shielding plate having a thickness and a height that do not interfere with image formation and document illumination, is provided on both end faces of the third opening. The lighting device according to. 5. The lighting device according to claim 1, wherein the inner surface of the cylinder is formed in a groove shape in a circumferential direction. 6. A pair of reflectors are provided on both sides of the second opening, and the diffused light emitted from the second opening and moving away from the original reading position is folded back toward the original reading position. The lighting device according to claim 1. 7. A diffuse reflection film comprising a cylinder and an internal light source, wherein the cylinder diffuses and reflects light from the light source,
A first opening for emitting the light diffused and reflected by the diffuse reflection film to the original reading position on the original mounting means, and for reading the information written on the original surface provided opposite to the first opening. And a second opening for emitting light to the reading optical system. 8. The lighting device according to claim 7, wherein the light source is provided with a light shielding plate so that direct light from the light source does not pass through the first opening and the second opening. 9. The lighting device according to claim 1, wherein a mirror surface for suppressing absorption of a light beam is provided between the diffuse reflection film and the material surface of the cylinder. 10. A first opening, which comprises a cylinder and an external light source, wherein the cylinder is provided with a first opening through which light from the light source enters.
The diffuse reflection film for diffusing and reflecting the light entered from the opening of the second opening, the second opening for emitting the light diffused and reflected by the diffuse reflection film to the original reading position on the original mounting means, and the second opening A third opening which is disposed at a position inclined by a certain angle in the sub-scanning direction from the facing position, and which emits light to a reading optical system for reading the information written on the document surface,
The corresponding portion on the cylinder that is specularly reflected on the surface of the document mounting means and directly generates the light mixed in the light flux imaged by the reading optical system is the fourth opening or the non-reflecting member. Lighting equipment. 11. The illumination device according to claim 10, wherein the third or fourth opening is also used as a first opening for allowing light to enter the cylinder from a light source. 12. The lighting device according to claim 10, wherein the fourth opening can be opened and closed. 13. A document reading / reproducing apparatus having the illumination device according to claim 12, wherein a first reading result obtained by reading a document by closing a fourth opening of the illumination device, and the illumination. The second reading result obtained by opening the fourth opening of the apparatus and reading the original, and the second reading result obtained by closing the fourth opening of the illuminating apparatus and reading the original without placing the original on the original mounting means. An original reading / reproducing apparatus having glossiness calculating means for calculating the glossiness of a document from the third read result, and performing different processing on a portion having a different glossiness. 14. A document reading / reproducing apparatus having the illumination device according to claim 12, wherein a first reading result obtained by reading a document by closing a fourth opening of the illumination device, and the illumination. The second reading result obtained by opening the fourth opening of the apparatus and reading the original, and the second reading result obtained by closing the fourth opening of the illuminating apparatus and reading the original without placing the original on the original mounting means. Glossiness calculating means for calculating the glossiness of the original from the third read result,
First processing method selecting means for selecting a processing method to be executed based on the glossiness obtained by the glossiness calculating means, and peripheral pixels adjacent to the target pixel are selected as the target pixel by the first processing method selecting means. It is determined that the same processing is performed, and
Secondly, the same processing area presence / absence determining means for determining whether or not to form a continuous area having a predetermined number of pixels or more, and the processing method to be executed are selected based on the result of the same processing area presence / absence determining means. An original reading / reproducing device, comprising: