JPH104473A - Document illumination device and image reading device using the same - Google Patents

Abstract

(57) [Problem] To provide an original illuminating device capable of illuminating an original which is not affected by the reflection density of the original while improving the illumination efficiency, and an image reading apparatus using the same. A document illuminating device for illuminating a reading area (6) of a document surface placed on a document table glass (5) in a slit shape with a light beam emitted from a light source (9) having a long axis cylindrical shape, Fluorescent resin plates 11 and 12 in which a fluorescent dye is dissolved in a transparent resin are disposed in the vicinity of the glass, and the reading area of the document surface is illuminated by using a light beam passing through the fluorescent resin plates.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an original illuminating apparatus and an image reading apparatus using the same, and more particularly, to an original placed on an original table using a fluorescent resin plate obtained by dissolving a fluorescent dye in a transparent resin. This is suitable for an apparatus such as a copying machine, for example, which efficiently illuminates a reading area (document reading area) on the surface in a slit shape.

[0002]

2. Description of the Related Art FIG. 20 is a sectional view of a main part of a fluorescent lamp used as a light source of a document illuminating device.

The fluorescent lamp 9 shown in FIG.
A gas containing mercury is sealed in a cylindrical transparent glass tube 1 having a length of about m, and an AC voltage of several hundred volts is applied to both ends (not shown) of the glass tube 1 to cause discharge. When the electrons flowing by this discharge pass through the inside of the glass tube 1, they collide with mercury atoms inside the glass tube 1 and generate ultraviolet rays. When the ultraviolet rays irradiate the fluorescent paint (fluorescent paint application portion) 2 applied to the inner peripheral surface of the glass tube 1, the fluorescent substance inside the fluorescent paint 2 is excited to emit visible light. This visible light is radiated from the opening 3 (the portion without the fluorescent paint) 3 to the outside of the fluorescent lamp 9.

A commonly used fluorescent lamp used in a copying machine capable of copying an A3-size original is 6 to 26 m in diameter.
In many cases, a glass tube of about m is used. This fluorescent lamp has lower luminance than the halogen lamp, but has a large area of a portion that emits visible light, so that the amount of emitted light is large and the luminous efficiency with respect to power consumption is high. Since the amount of emitted light is substantially proportional to the area on which the fluorescent coating is applied, increasing the diameter of the glass tube and applying the fluorescent coating more widely increases the amount of emitted light. The light beam radiated from the opening of the fluorescent lamp to the outside illuminates the reading area (document illumination unit) on the document surface via the reflector.

FIGS. 21 and 22 are a perspective view and a schematic view of a main part of a main part of a conventional document illuminating device when the above-mentioned fluorescent lamp is used as a light source for illuminating a document.

In FIG. 21 and FIG. 22, the ultraviolet light generated inside the glass tube 1 becomes visible light in a fluorescent paint application section 2 applied to the inner peripheral surface of the glass tube 1, and the visible light is The glass tube 1 is released from the opening (window) 3 where the paint is not applied.

The emitted light beam irradiates a reading area (original illumination unit) 106 on the surface of the original 111 placed on the original table glass 105 via the reflector 104 in a slit shape.
The reflected light beam from the document illumination unit 106 is directed to a scanning mirror and an image forming lens (not shown) provided below the document table glass 105, and is read as image information by a reading unit.

[0008]

The above-mentioned conventional document illuminating device has the following problems.

Since the fluorescent lamp has a low luminance and a large light-emitting area, it is difficult to efficiently converge the emitted light flux on the original illumination unit. For example, as shown in FIG. 22, a light beam (unnecessary light beam) 1 that cannot be irradiated on the document illumination unit 106.
08 etc. will occur. For this reason, when a larger amount of illumination light is required, it is necessary to use a fluorescent lamp having a larger diameter and a larger light emitting area. Therefore, for example, when a fluorescent lamp having a large diameter is incorporated in a copying machine, there is a problem that the entire copying machine becomes large.

Since a large area other than the document illuminating unit 106 is illuminated, the amount of light reflected from the surface of the document 111 is large. As a result, this reflected light flux is reflected by the reflection shade 104 and the fluorescent lamp 9.
Then, the surface of the original 111 is irradiated again via the device. When the amount of the reflected light beam is large, the amount of illumination changes depending on the density of the document. For example, there is a problem that a document having a low density has a lower density and a document having a high density has a higher density.

A first object of the present invention is to increase the illumination efficiency of a fluorescent lamp as a light source by disposing a fluorescent resin plate obtained by dissolving a fluorescent dye in a transparent resin in the vicinity of the platen glass. Document illumination device that can perform

A second object of the present invention is to dispose a fluorescent resin plate obtained by dissolving a fluorescent dye in a transparent resin near the platen glass, and to read an image from the original surface between the original surface and the fluorescent resin plate. It is an object of the present invention to provide an image reading apparatus which is provided with a light blocking member for blocking unnecessary light flux which does not contribute to the image reading, thereby improving the illumination efficiency and not being affected by the reflection density of the document.

[0013]

According to the present invention, there is provided a document illuminating apparatus comprising: (1) a reading area of a document surface placed on a document table glass by a light beam radiated from a light source having a long-axis cylindrical shape; An original illuminating device, wherein a fluorescent resin plate obtained by dissolving a fluorescent dye in a transparent resin is disposed near the original platen glass, and reading of the original surface is performed using a light beam passing through the fluorescent resin plate. It is characterized in that the area is illuminated.

In particular, (1-1) the fluorescent resin plate is arranged at a position other than the reading area on the original surface, and one end of the fluorescent resin plate in the short direction is in the vicinity of the reading region on the original surface. And (1-2) of the luminous flux emitted from the light source, the luminous flux that is not directly incident on the reading area of the document surface is incident on the fluorescent resin plate, A part of the light beam emitted from the end portion and a light beam of the light beam emitted from the light source, which is directly incident on the reading region of the document surface, are used to illuminate the reading region of the document surface. (1-3) When the fluorescent resin plate is disposed near the platen glass, reflection processing is performed on an end surface other than near the reading area of the document surface and on a surface other than a surface on which a light beam from the light source is incident. Or (1-4) the fluorescent resin plate opposite to the reading area side of the original surface A reflecting member is disposed near the end, and the reflecting member reflects a light beam of the light beam emitted from the light source, which is not directly incident on the reading area of the document surface, toward the fluorescent resin plate, and reflects the light onto the fluorescent resin plate. The light flux that is incident and reaches the end of the original surface opposite to the reading region side inside the fluorescent resin plate and that is not directly incident on the reading region of the original surface is reflected to the fluorescent resin plate side, 5) One end of the fluorescent resin plate in the short direction is bent toward the reading area side of the original surface, or (1-6) the transmission diffusion process is performed on one end surface of the fluorescent resin plate in the short direction. Or (1-7) bending one end in the short direction of the fluorescent resin plate toward the reading area side of the document surface, and performing a transmission diffusion process on the surface of the end, (1-8) contributes to image reading of the light flux reflected on the original surface between the fluorescent resin plate and the original platen glass And to the arrangement of the light-shielding member for shielding no unnecessary light beam,
(1-9) One end face in the short direction of the fluorescent resin plate is inclined with respect to the platen glass surface, or (1-10) between the fluorescent resin plate and the platen glass A light-shielding member for shielding unnecessary light fluxes not contributing to image reading among the light fluxes reflected on the document surface, and one end face of the fluorescent resin plate in the short direction is inclined with respect to the glass surface of the document table. And (1-11) the fluorescent resin plate has a platen glass such that an end surface of the document surface on the reading area side is inclined with respect to the platen glass surface. Or (1-12) an optical member having a roof-shaped unevenness is disposed near a flat surface of the fluorescent resin plate on the platen glass side, and the fluorescent resin of the optical member is disposed. The surface on the plate side is composed of a specular reflection surface or a diffuse reflection surface, and the surface on the platen glass side is shaded. That and that has been applied, (1-1
3) The fluorescent resin plate is disposed so as to be inclined with respect to the original platen glass surface such that an end surface of the original surface on the reading area side is inclined with respect to the original platen glass surface. An optical member having a roof-shaped unevenness is arranged near a flat surface on the base glass side, and the surface of the optical member on the fluorescent resin plate side comprises a specular reflection surface or a diffuse reflection surface, and the surface on the platen glass side is light-shielded. The processing is performed, and (1-14) the fluorescent resin plate has a slit opening in a part thereof, and reads the original surface out of the luminous flux emitted from the light source from the slit opening. Illuminating the reading area of the document surface by passing the light beam directly incident on the area, and of the light flux emitted from the light source, the light beam not directly incident on the reading area of the document surface is incident on the fluorescent resin plate, Emitted from the cross section of the slit opening of the fluorescent resin plate And (1-15) the fluorescent resin plate has an end surface other than the cross section of the slit opening and the surface other than the surface on which the light beam from the light source is incident. And (1-16) both ends in the longitudinal direction of the fluorescent resin plate are bent.

(2) A document illuminating device for illuminating a reading area of a document surface placed on a document table glass in a slit shape with a light beam emitted from a light source having a long axis cylindrical shape,
A spiral fluorescent resin plate obtained by dissolving a fluorescent dye in a transparent resin so as to surround a part of the outer peripheral portion of the light source is positioned such that one end of the fluorescent resin plate is located near the reading area of the document surface. And a spiral reflector that surrounds the fluorescent resin plate on the outer peripheral portion of the fluorescent resin plate and reflects a part of the light beam emitted from the light source toward the reading area side of the document surface. And a light-shielding process is performed on a surface of the reflection plate where the reflection plate and the platen glass face each other.

In particular, (2-1) a reflecting member is disposed in front of the light source to reflect a light beam which does not directly enter the reading area on the document surface toward the reading area on the document surface.

(3) A document illuminating device for illuminating a reading area of a document surface placed on a document table glass in a slit shape with a light beam emitted from a light source having a long axis cylindrical shape,
A fluorescent resin plate obtained by dissolving a fluorescent dye in a transparent resin is cut into two first and second fluorescent resin plates in the vicinity of the platen glass and at a position other than the reading area on the original surface, and the fluorescent resin plates are arranged respectively. The reading area of the document surface is illuminated using a light beam passing through the two fluorescent resin plates.

In particular, (3-1) the cut surfaces of the first and second two fluorescent resin plates are arranged so as to be located in the vicinity of the reading area of the document surface, and (3-2) the light source Out of the luminous flux radiated from the scanner, the luminous flux directly incident on the reading area on the original surface is directed to the reading area on the original surface through the opening formed by the first and second fluorescent resin plates cut into two. Of the light flux emitted from the light source, the light flux not directly incident on the reading area of the original surface is incident on the first and second two fluorescent resin plates, and the light flux of the first and second two fluorescent resin plates is (3-3) that the first and second two fluorescent resin plates are other than the respective cut surfaces; And that the end surface other than the surface on which the light beam from the light source is incident is subjected to reflection processing, and (3-4) the first, 2, a reflecting member is disposed near an end of the first fluorescent resin plate opposite to the reading area side of the original surface of the first fluorescent resin plate, and the reflecting member is configured to emit light emitted from the light source. The light flux not directly incident on the reading area of the original surface is reflected to the first fluorescent resin plate side, and is incident on the first fluorescent resin plate, and the light of the original surface is reflected inside the first fluorescent resin plate. (3-5) reflecting the light flux that has not reached the reading area on the original surface that has reached the end opposite to the reading area side directly to the first fluorescent resin plate side; (3-6) the end portions of the two fluorescent resin plates on the cut surface side are respectively bent toward the reading area side of the document surface, and (3-6) the light passes through the cut surfaces of the first and second fluorescent resin plates. (3-7) The end of the first and second two fluorescent resin plates on the cut surface side is placed on the reading area side of the document surface. (3-8) that each of the first and second fluorescent resin plates is subjected to transmission diffusion processing on the cut surface thereof, and that (3-8) the first fluorescent resin plate and the platen glass (3-9) The light-shielding member that shields unnecessary light fluxes that do not contribute to image reading among the light fluxes reflected on the document surface is disposed, and (3-9) the cut surfaces of the first and second two fluorescent resin plates are (3-10) that the first platen is inclined with respect to the platen glass surface;
And a light-shielding member that blocks unnecessary light flux not contributing to image reading out of the light flux reflected on the document surface between the fluorescent resin plate and the platen glass, and the first and second two light-shielding members. (3-11) The first and second two fluorescent resin plates are provided such that the cut surface of the fluorescent resin plate is inclined with respect to the platen glass surface, and the cut surface is subjected to transmission diffusion processing. And (3-12) the first and second two fluorescent resins are arranged so as to be inclined with respect to the platen glass surface so that the cut surface thereof is inclined with respect to the platen glass surface. An optical member having a roof-shaped unevenness is disposed near a plane of the first fluorescent resin plate on the platen glass side of the first fluorescent resin plate, and a surface of the optical member on the first fluorescent resin plate side is specularly reflected. Surface or a diffuse reflection surface, and the surface on the platen glass side is subjected to light shielding processing, (3-13) The first and second two fluorescent resin plates are arranged so as to be inclined with respect to the platen glass surface such that the cut surfaces thereof are inclined with respect to the platen glass surface. Of the first and second two fluorescent resin plates, an optical member having a roof-shaped unevenness is arranged in the vicinity of a plane of the first fluorescent resin plate on the platen glass side; Is characterized in that the surface on the side of the fluorescent resin plate comprises a specular reflection surface or a diffusion reflection surface, and the surface on the platen glass side is subjected to a light shielding treatment.

The image reading apparatus of the present invention comprises: (4) The above (1), (1-1) to (1-16), (2), (2-1), (3), (3-1) ~ (3
13. The document illuminating device according to any one of -13), wherein the image information of the document illuminated by the document illuminating device is read by a reading means.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First, a fluorescent resin plate used in the present invention will be described in advance.

As the fluorescent dye of the fluorescent resin plate used in the present invention, for example, diaminostilbene, uranine, thioflavin T, eosin, rhodamine B, or the like is dissolved in a transparent resin, for example, an alkyd resin, an acrylic resin, an acrylic emulsion, or a vinyl emulsion. Put in. This is formed into, for example, a plate having a thickness of about 0.3 mm to 5 mm sandwiched between flat surfaces, and the flat portion is processed into a mirror surface.

When ultraviolet light or visible light enters the mirror-finished flat portion of the fluorescent resin plate from outside, the fluorescent dye inside the fluorescent resin plate is excited to emit fluorescent light as visible light. Most of the luminous flux emitted by the fluorescence is directed to the end of the fluorescent resin plate while being totally reflected by the mirror surface inside the resin, and is emitted to the outside there. The amount of light emitted from the end is proportional to the amount of light incident on the fluorescent resin plate.

Specific products of the fluorescent resin plate include Acrylite (registered trademark) Fluorescent Green 993 and Fluorescent Pink 994 of Mitsubishi Rayon Co., Ltd., and SUMIPEX (registered trademark) and Fluorescent Green of Sumitomo Chemical Co., Ltd. 65, fluorescent pink 451 and the like.

Next, each embodiment of the present invention will be described in order.

FIG. 1 is a perspective view of a main part of a first embodiment of the present invention.
FIG. 2 is a schematic view of a main part when viewed from the direction of arrow A in FIG. 1, and FIG. 3 is an enlarged explanatory view around the fluorescent resin plate of FIG.

In the figure, reference numeral 9 denotes a light source, which comprises a fluorescent lamp having a long axis cylindrical shape shown in FIG. Reference numeral 4 denotes a first reflection shade, which condenses a light beam emitted from the fluorescent lamp 9 and condenses it on a reading area (original illumination unit) 6 on the original surface.
Reference numeral 5 denotes a platen glass on which a document (not shown) is placed.

Reference numerals 11 and 12 respectively denote the above-mentioned fluorescent resin plates.
First and second fluorescent resin plates formed of a flat plate (a rectangular parallelepiped) cut into two pieces. In the present embodiment, the first and second fluorescent resin plates 11 and 12 are arranged near the original platen glass 5 and in parallel with the surface of the original platen glass 5 and at positions other than the original illuminating section 6, respectively. The first and second fluorescent resin plates 11 and 12 are arranged opposite to each other with the original illuminating section 6 interposed therebetween so that the cut surfaces (end faces) 11 a and 12 a of the second fluorescent resin plates 11 and 12 are located near the original illuminating section 6. 10 is a first and second two fluorescent resin plates 11, 1
2 (slit opening).

In this embodiment, the light beam emitted from the fluorescent lamp 9 is condensed by the first reflection shade 4, and the reading area of the original surface placed on the original platen glass 5 through the slit opening 10 (original illumination) (Part) 6 in a slit shape. At this time, a light beam (unnecessary light beam) 8 that does not directly enter the reading area of the document surface is incident on the first and second fluorescent resin plates 11 and 12 directly or via the first reflector 4. After the unnecessary light beam 8 enters the first and second fluorescent resin plates 11 and 12, a part of the light beam is removed from the first and second fluorescent resin plates 11 and 12.
Penetrates through the first and second fluorescent resin plates 11 and 12, and a part of the light flux collides with the fluorescent dye 20 inside the first and second fluorescent resin plates 11 and 12 to emit visible light as described above. ,
The light is emitted from the ends (end faces) of the first and second fluorescent resin plates 11 and 12, respectively. Some of the emitted light fluxes emitted toward the slit opening 10 are part of the end faces 11a, 1
The light is diffused at 2a, and a part of the light beam illuminates the document illumination unit 6. Thus, in the present embodiment, the light flux (effective light flux) 7 directly entering the reading area of the document surface and the end faces 11a and 12
The illumination efficiency is increased by irradiating the original illumination unit 6 with the light flux emitted from the light source a.

As described above, in this embodiment, as described above, a fluorescent resin plate obtained by dissolving a fluorescent dye in a transparent resin is provided between the fluorescent lamp 9 and the document table glass 5 and at a position other than the document illuminating section 6. It is cut into two and placed in parallel with the platen glass 5, and the cut surfaces 1 of the two fluorescent resin plates 11 and 12 are cut.
By arranging 1a and 12a so as to be located in the vicinity of the original illuminating section 6, a part of the luminous flux (unnecessary luminous flux 8) which has not been condensed on the original illuminating section 6 in the past can be reduced to the two fluorescent resin plates 1.
Lighting efficiency is enhanced by utilizing the light flux condensed at 1 and 12 and emitted from the end portions (end surfaces) of the two fluorescent resin plates 11 and 12 toward the document illumination section 6. In the present embodiment, the space for this purpose is increased.
The thickness of about 2 is very small.

Further, in the present embodiment, the first and second 2
If the two fluorescent resin plates 11 and 12 are formed so as to perform reflection processing on the end surfaces other than the vicinity of the slit opening 10 and the surface on which the light beam from the fluorescent lamp 9 is incident, the first and second two fluorescent resin plates are provided. Ends 11 near slit openings 10 of 11 and 12
a, 12a, it is possible to increase the light amount of the light flux, and thereby, it is possible to further enhance the illumination efficiency of the document illumination unit 6.

In the present embodiment, the fluorescent resin plate is cut into a plurality of pieces and the plurality of pieces are arranged in the vicinity of the document illuminating section 6. However, a plurality of independent fluorescent resin plates may be arranged without cutting. However, the present invention can obtain substantially the same effects as those of the first embodiment even with one fluorescent resin plate. The same can be said for each of Embodiments 2 to 5 described later.

FIG. 4 is a schematic view of a main part of a second embodiment of the present invention,
FIG. 5 is an enlarged explanatory view around the fluorescent resin plate shown in FIG. 4 and 5, the same elements as those shown in FIG. 2 are denoted by the same reference numerals.

The present embodiment differs from the first embodiment in that a second reflection shade 24 as reflection means is provided on the opposite side of the fluorescent lamp 9 with the slit opening 10 interposed therebetween.
A reflection mirror 17 is provided near the end of the first fluorescent resin plate 11 on the side opposite to the slit opening 10 side. Other configurations and optical functions are substantially the same as those of the first embodiment, and thus the same effects are obtained.

That is, in the figure, reference numeral 24 denotes a second reflector, which is disposed at a position opposite to the fluorescent lamp 9 with the slit opening 10 interposed therebetween. A part of the unnecessary light beam (unnecessary light beam) 8 that does not directly enter the reading area of the surface is reflected toward the document illumination unit 6 side. 1
A reflecting mirror 7 is provided near the end of the first fluorescent resin plate 11 on the side opposite to the slit opening 10 side, and is provided with a fluorescent lamp 9.
A part of the unnecessary light flux (unnecessary light flux) 8 out of the light flux emitted from the first fluorescent resin plate 11 is reflected on the first fluorescent resin plate 11 side and is incident on the first fluorescent resin plate 11. Unnecessary luminous flux 8 incident on the first fluorescent resin plate 11 and reaching the end opposite to the slit opening 10 side inside the first fluorescent resin plate 11 is directed to the first fluorescent resin plate side 11. The light is reflected and is incident on the first fluorescent resin plate 11 again. Thereby, the light flux incident on the first fluorescent resin plate 11 is further increased as compared with the first embodiment.

In this embodiment, the reflection means such as the reflection shade 24 and the reflection mirror 17 are provided in the vicinity of the first fluorescent resin plate 11 as described above, so that the first fluorescent resin plate 11 is further provided in comparison with the first embodiment. Can be increased, whereby the illumination efficiency of the document illumination unit 6 can be further increased as compared with the first embodiment.

FIG. 6 is a schematic view of a main part of a third embodiment of the present invention.
FIG. 7 is an enlarged explanatory view around the end portion of the first fluorescent resin plate shown in FIG. 6 and 7, the same elements as those shown in FIGS. 2 and 3 are denoted by the same reference numerals.

The present embodiment differs from the first embodiment in that the cut surfaces 31a and 32a of the first and second two fluorescent resin plates 31 and 32 face the document illuminating section 6 (original lighting). End portions of the first and second fluorescent resin plates 31 and 32 on the side of the slit opening 10 are slightly bent toward the original illuminating portion 6 so as to face each other. That is, transmission diffusion processing is performed on 31a and 32a. Other configurations and optical functions are substantially the same as those of the first embodiment, and thus the same effects are obtained.

That is, in the figure, reference numerals 31 and 32 denote first and second fluorescent resin plates, respectively, and the cut surfaces 31a and 32a of the first and second fluorescent resin plates 31 and 32 illuminate the original. Facing the document 6 (facing the document illumination 6)
In addition, the first and second fluorescent resin plates 31 and 32 are formed by slightly bending the ends on the slit opening 10 side, and the cut surfaces 31a and 32a are subjected to transmission diffusion processing.

In this embodiment, as a method of bending the end portion of the fluorescent resin plate, for example, a method of deforming by heating from a flat plate, a method of forming a shape bent at the time of molding, or the like is used. As the diffusion processing, a matte processing or a mat processing is used.

In this embodiment, as described above, the first and second 2
Cut surface (end surface) 31 of each of two fluorescent resin plates 31 and 32
The ends of the first and second fluorescent resin plates 31 and 32 on the side of the slit opening 10 are slightly bent so that the first and second fluorescent resin plates 31 and 32 are directed toward the original illuminating section 6 so as to be viewed from the original illuminating section 6. It is possible to increase the apparent light-emitting area of the cut surfaces 31a and 32a, which are light-emitting surfaces, and to perform a diffusion process on each of the cut surfaces 31a and 32a, thereby minimizing the surface of the cut surfaces 31a and 32a. The unevenness of the light amount due to the unevenness and deformation is effectively prevented. As described above, in the present embodiment, the illumination efficiency is further improved than in the first embodiment by appropriately configuring each element.

FIG. 8 is a schematic view of a main part of a fourth embodiment of the present invention.
FIG. 9 is an enlarged explanatory view around the first fluorescent resin plate shown in FIG. 8 and 9, the same elements as those shown in FIGS. 2 and 3 are denoted by the same reference numerals.

The present embodiment is different from the first embodiment in that a flat member (light-shielded) having a light-shielding process on one surface is provided between the first fluorescent resin plate 41 and the platen glass 5 (original surface). 25) and the cut surfaces 41a, 42a of the first and second fluorescent resin plates 41, 42 are formed so as to be approximately 45 ° with respect to the platen glass 5 surface (document surface). And that the cut surfaces 41a and 42a are subjected to transmission diffusion processing. Other configurations and optical functions are substantially the same as those of the first embodiment, and thus the same effects are obtained.

That is, in the figure, reference numeral 25 denotes a flat member (light-shielding member). The surface 16 of the flat member 25 on the platen glass 5 side is subjected to a black light-shielding process with a low reflectivity. The surface 19 on the side opposite to the fifth side is subjected to a white diffusion process, and is disposed close to the upper portion of the first fluorescent resin plate 41 with the air layer interposed therebetween, and is reflected from the original surface (not shown). Unnecessary light fluxes 26 that do not contribute to reading of the incoming image are prevented from re-entering the first fluorescent resin plate 41.

Each of the cut surfaces 41a and 42a of the first and second fluorescent resin plates 41 and 42 is placed on the original platen glass 5 (original surface).
, And each of the cut surfaces 41a and 42a is subjected to a transmission diffusion process. The platen glass 5 of each of the cut surfaces 41a and 42a
The inclination angle with respect to the surface is arbitrary.

In this embodiment, as shown in FIGS. 8 and 9, the unnecessary light flux 8 which is directly incident on the first fluorescent resin plate 41 from the fluorescent lamp 9 and transmitted therethrough is used as the surface 19 of the flat member 25 on which the white diffusion processing is performed. Then, the incident light is re-incident on the first fluorescent resin plate 41, and the re-incident light beam is used as a diffused light beam, so that the incident angle range incident on the first fluorescent resin plate 41 is widened. The optical path length when passing through the fluorescent resin plate 41 is increased. In the present embodiment, the unnecessary light flux 26 not contributing to the reading of the image reflected from the document surface (not shown) is used as the flat member 2.
By shielding the light on the surface 16 subjected to the light-shielding process of No. 5,
The first fluorescent resin plate 41 is prevented from being re-entered. Further, in the present embodiment, the first and second fluorescent resin plates 41,
42 are formed so as to be approximately 45 ° with respect to the surface of the platen glass 5 and
By performing the diffusion process on 1a and 42a, efficient illumination is performed.

As described above, in the present embodiment, the first
The light flux transmitted without colliding with the fluorescent dye 20 inside the fluorescent resin plate 41 is reflected by the flat member (light shielding member) 25 and is incident on the first fluorescent resin plate 41 again, so that the fluorescence is efficiently increased. The unnecessary reflected light flux that does not contribute to image reading from the document surface is shielded (disappeared) by the light shielding portion of the flat member 25, so that the light beam illuminating the document surface reflects the reflected light beam from the document surface again. The surface is not illuminated. This enables illumination that is not affected by document density. Further, the first and second fluorescent resin plates 4
The cutting surfaces 41a and 42a are formed so as to be approximately 45 ° with respect to the surface of the platen glass 5, and the cut surfaces 41a and 42a are subjected to diffusion processing to thereby obtain the respective cutting surfaces 41a and 42a. , 42a are also increased, thereby increasing the illumination efficiency of the document illumination unit 6.

Incidentally, a member similar to the above-described light shielding member 25 may be provided between the second fluorescent resin plate 42 and the document table glass 5.

FIG. 10 is a schematic view of a main part of a fifth embodiment of the present invention, and FIG. 11 is an enlarged explanatory view around the fluorescent resin plate shown in FIG. 10 and 11, the same elements as those shown in FIGS. 2 and 3 are denoted by the same reference numerals.

The present embodiment is different from the first embodiment in that the cut surfaces 51a and 52a of the first and second two fluorescent resin plates 51 and 52 are directed toward the original illuminating section 6 (original platen). The first, not perpendicular to the lower surface of the glass 5)
The second fluorescent resin plates 51 and 52 are arranged at a predetermined angle with respect to the surface of the platen glass 5, and the first fluorescent resin plate 51 is provided with a roof-shaped unevenness near the plane of the platen glass 5 side. That is, the reflecting mirror 15 constituted by the reflecting surface is arranged along the plane. Other configurations and optical functions are substantially the same as those of the first embodiment, and thus the same effects are obtained.

That is, in the figure, reference numerals 51 and 52 denote first and second fluorescent resin plates, respectively, in order to make the first and second fluorescent resin plates 51 and 52 parallel to the surface of the platen glass 5. The cut surfaces 51a and 5 of the respective fluorescent resin plates 51 and 52
2a is inclined at a predetermined angle so as to face the original illuminating unit 6 (not perpendicular to the lower surface of the original table glass 5). Reference numeral 15 denotes a reflecting mirror as an optical member, which is disposed in the vicinity of a flat surface of the first fluorescent resin plate 51 on the platen glass 5 side, and has a roof-shaped uneven reflecting surface on the first fluorescent resin plate 5 side. (A specular reflection surface or a diffuse reflection surface), and a light shielding process is applied to the back surface 16 of the reflection mirror 15 to prevent reflection and transmission of a light beam.

In the present embodiment, unnecessary light fluxes 8 that do not directly enter the reading area of the document surface transmitted through the first fluorescent resin plate 51
Is reflected by the reflecting mirror 15 and is again incident on the fluorescent resin plate 51 to increase the fluorescence, and unnecessary light flux not contributing to image reading reflected from a document surface (not shown) is not reflected by the reflecting mirror 15. The light is shielded by the back surface 16 of the first fluorescent resin plate 51 so as not to re-enter the first fluorescent resin plate 51.

As described above, in the present embodiment, as described above, the first and second two fluorescent resin plates 51 and 52 are arranged at a predetermined angle with respect to the surface of the original platen glass 5 so that
The first and second fluorescent resin plates 5 without deforming the fluorescent resin plate.
1 and 52, the cut surfaces 51a and 52a
And the first fluorescent resin plate 5
By arranging the reflecting mirror 15 having a roof-shaped uneven reflecting surface in the vicinity of the flat surface on the side of the original platen glass 5, substantially the same effect as in the third and fourth embodiments described above is obtained.
In the present embodiment, the inclination angles of the first and second fluorescent resin plates 51 and 52 with respect to the surface of the platen glass 5 are arbitrary.

FIG. 12 is a schematic view of a main part of a sixth embodiment of the present invention. In the figure, the same elements as those shown in FIG. 2 are denoted by the same reference numerals.

In the figure, reference numeral 22 denotes a spiral fluorescent resin plate, which is arranged so as to surround the outer peripheral portion of the fluorescent lamp 29 on the side opposite to the original illuminating portion 6 side.
Are arranged such that one end 22a of the document is located near the document illumination section 6. Reference numeral 23 denotes a spiral reflecting plate (reflecting mirror), which is disposed so as to surround the outer peripheral surface of the fluorescent resin plate 22, and near the original table glass 5, near the original table glass 5.
A light-shielding process is performed on the surface 18 facing the surface, and a part of a light beam emitted from the fluorescent lamp 29 is reflected toward the original illuminating unit 6. Reference numeral 17 denotes a reflector made of a parallel flat plate, which is disposed in front of the fluorescent lamp 29 and illuminates a part of a light beam (unnecessary light beam) 8 radiated from the fluorescent lamp 29 and not directly incident on the reading area of the document surface. The light is reflected on the part 6 side.
It should be noted that the fluorescent lamp 29 in this embodiment is different from the fluorescent lamp 9 having the opening (window) used in the above-described embodiment in that the luminous flux is radiated from the entire area of the outer peripheral surface of the fluorescent lamp 29. Made up of

In this embodiment, of the luminous flux emitted from the fluorescent lamp 29, the luminous flux directed to the side opposite to the original illuminating section 6 is made incident on the spiral fluorescent resin plate 22 and transmitted through the fluorescent resin plate 22. The light flux is again incident on the fluorescent resin plate 22 by the spiral reflecting plate 23, and the end portion 22 of the fluorescent resin plate 22 is
The light amount of the light beam emitted from a is increased. Thereby, in this embodiment, the light flux emitted from the end 22a is
The illumination efficiency is increased by illuminating the original illumination unit 6 using the light beam reflected by the spiral reflecting plate 23 and the light beam reflected by the parallel plate reflecting plate 17.

Further, in this embodiment, since the thin glass tube 1 constituting the fluorescent lamp 29 is surrounded by the spiral fluorescent resin plate 22, it is possible to prevent the fluorescent lamp 29 from being cracked by an external impact of the illumination system. Even if the glass tube 1 is broken, the glass fragments can be made hard to scatter around, so that in this case, the effect that the cleaning becomes easy can be obtained.

FIGS. 13A and 13B are an explanatory view when the fluorescent resin plate of Embodiment 7 of the present invention is viewed from above and an enlarged explanatory view of a part thereof. FIG. 14 is a schematic view of a main part of a main part when the fluorescent resin plate shown in FIG. 13 is incorporated in a document illumination device. Although the original table glass is not shown in the figure, it is arranged above the fluorescent resin plate. FIG.
FIG. 15 is an enlarged sectional view around a longitudinal end of the fluorescent resin plate shown in FIG. 14. FIG. 3 shows a state of a light beam emitted from a plurality of cross sections (cut surfaces) of the slit opening and a light beam emitted from a fluorescent lamp. 13, 14, and 15, the same elements as those shown in FIGS. 1 and 2 are denoted by the same reference numerals.

This embodiment is different from the first embodiment in that a slit opening 26 is provided in the center of a single fluorescent resin plate 13 without cutting the fluorescent resin plate, and the fluorescent lamp 9 emits light. The light beam (effective light beam) of the light beam directly incident on the reading area on the document surface illuminates the document illumination unit through the slit opening 26 and the light beam emitted from the fluorescent lamp 9 directly enters the reading region on the document surface. An unrequired light beam (unnecessary light beam) is made to enter the fluorescent resin plate 13, and the original illuminating portion is illuminated by using the light beams emitted from the plurality of cut surfaces 26 a of the slit openings 26 of the fluorescent resin plate 13. That is what we did. Other configurations and optical functions are substantially the same as those of the first embodiment, and thus the same effects are obtained.

That is, in the figure, reference numeral 13 denotes a fluorescent resin plate composed of a single flat plate, and a slit opening 26 is provided at the center of the flat plate 13 (near the document illumination unit 6). Reflection processing is performed on the end surfaces other than the plurality of cross sections (cut surfaces) 26a and the surfaces on which the light flux from the fluorescent lamp 9 is incident.

In the first to fifth embodiments, the first and second two fluorescent resin plates are arranged at two positions with the slit opening interposed therebetween, and the effective light beam passing through the slit opening and the slit opening are provided. The document illuminating section is illuminated with the light beams from both sides in the longitudinal direction of the original.
The slit opening 26 is provided at the center of the fluorescent resin plate 13 and the effective light beam passing through the slit opening 26 is incident on the fluorescent resin plate 13 and emitted from the plurality of cut surfaces 26 a of the slit opening 26 of the fluorescent resin plate 13. The light source illuminates the document illumination unit.

As described above, in the present embodiment, by providing the slit opening 26 at the center of the fluorescent resin plate 13 as described above, the amount of light at both ends in the longitudinal direction of the slit opening 26 can be increased. As a result, the lighting efficiency can be improved. Also, in the present embodiment, the above-described first to first embodiments are used.
Unlike FIG. 5, only one fluorescent resin plate 13 is required, so that the assembling work can be facilitated.

FIGS. 16A and 16B are an explanatory view when the fluorescent resin plate of the eighth embodiment of the present invention is viewed from above and an enlarged explanatory view of a part thereof. FIG. 17 is a schematic view of a main part of a main part when the fluorescent resin plate shown in FIG. 16 is incorporated in a document illumination device. Although the original table glass is not shown in the figure, it is arranged above the fluorescent resin plate. FIG.
FIG. 17 is an enlarged cross-sectional view around a longitudinal end of the fluorescent resin plate shown in FIG. 16. FIG. 3 shows the state of a light beam emitted from a cross section (cut surface) of the slit opening and a light beam emitted from a fluorescent lamp. 16, 17, and 18, the same elements as those shown in FIGS. 13, 14, and 15 are denoted by the same reference numerals.

The present embodiment is different from the above-described seventh embodiment in that the longitudinal end portions 14a of the fluorescent resin plate 14 are slightly bent, so that the cut surface 26a of the slit opening 26 at each end portion 14a can be used as a document. That is, it is inclined to the surface side. Other configurations and optical functions are substantially the same as those in the above-described seventh embodiment, and thus, similar effects are obtained.

That is, in the figure, reference numeral 14 denotes a fluorescent resin plate composed of a single flat plate, and both ends 14a in the longitudinal direction are slightly bent so as to approach both ends of the fluorescent lamp 9, and the both ends 14a are formed. The cut surface 26a of the slit opening 26 is shown in FIG.
As shown in the figure, the sheet is formed so as to be inclined toward the original illumination section. 9a is a fluorescent lamp base.

As described above, in the present embodiment, as described above, both ends 14 a in the longitudinal direction of the fluorescent resin plate 14 are slightly bent, and the both ends 14 a are arranged close to both ends of the fluorescent lamp 9. At both ends of the fluorescent lamp 9, more luminous flux can be efficiently incident on the fluorescent resin plate 14,
In addition, since the cut surface 26a, which is the light emitting surface, faces the document illuminating section, the apparent light emitting area seen from the document illuminating section can be increased, and the light amount at both ends can also be improved. Thereby, the lighting efficiency can be further improved.

If the document illuminating device of each embodiment described above is incorporated in an image reading device such as a copying machine, an image reading device with high illumination efficiency and not affected by the reflection density of the document can be obtained. be able to. FIG. 20 is a schematic view of a main part when the document illuminating device according to the fourth embodiment is incorporated in an image reading apparatus. In the figure, the image information of the original 60 illuminated by the illuminating means including the light source 9, the reflection shade 4, the fluorescent resin plates 11, 12 and the light-shielding members (plane members) 25, etc. is transferred to a plurality of scanning mirrors 61, 62, 63. An image is formed on a surface of reading means 65 such as a line sensor by an imaging lens (imaging means) 64 through the
0 is read with high precision.

[0067]

According to the present invention, as described above, the reading area (original illuminating section) of the original surface placed on the original platen glass using the fluorescent resin plate obtained by dissolving the fluorescent dye in the transparent resin is used. A document illuminating device capable of reliably improving illumination efficiency with a simple configuration by efficiently illuminating in a slit shape, and performing document illumination unaffected by the reflection density of a document, and an image reading apparatus using the same. The device can be achieved.

In particular, according to the first embodiment, by disposing the two cut fluorescent resin plates in the vicinity of the original illuminating section, the light flux (unnecessary luminous flux) which was not directed to the original illuminating section and was wasted in the past. ), A part of the light beam can be directed to the original illuminating section, whereby the illumination efficiency can be increased, and an increase in the space therefor can be made very small as much as the thickness of the fluorescent resin plate.

According to the second embodiment, of the first and second two fluorescent resin plates cut into two, a reflecting means such as a reflective shade or a reflecting mirror is provided near one of the first fluorescent resin plates. Is provided, the light flux incident on the first fluorescent resin plate can be further increased than in the first embodiment, whereby the illumination efficiency to the original illumination section can be further improved.

According to the third embodiment, the ends of the first and second fluorescent resin plates in the short direction are bent so that the cut surfaces of the first and second fluorescent resin plates face the original illuminating section side, so that they can be viewed from the original illuminating section. Thus, the apparent light emitting area can be increased, thereby improving the lighting efficiency.

According to the fourth embodiment, a flat member (light-shielding member) having one surface subjected to light-shielding processing is provided above the first fluorescent resin plate, and the flat member does not contribute to image reading from the original surface. By blocking (eliminating) the unnecessary reflected light beam, it is possible to prevent the unnecessary reflected light beam from irradiating the original surface again, thereby enabling illumination which is not affected by the original density. Further, the light flux transmitted without colliding with the fluorescent dye inside the first fluorescent resin plate is reflected by the flat member, and is again incident on each fluorescent resin plate.
Fluorescence can be efficiently increased, whereby the luminous flux emitted from the cut surface of the first fluorescent resin plate further increases, and the illumination efficiency to the document illumination section can be improved. Further, the cut surfaces of the first and second fluorescent resin plates are formed to be inclined with respect to the glass surface of the document table, and the cut surfaces are subjected to a diffusion process, so that the luminous flux radiated from the cut surfaces is also increased. The lighting efficiency for the lighting unit 6 can be further increased.

According to the fifth embodiment, the first and second two fluorescent resin plates are arranged to be inclined with respect to the platen glass, and the reflection of the roof-shaped unevenness near the end face of the first fluorescent resin plate. By providing a reflecting mirror composed of surfaces, the cut surfaces of the first and second two fluorescent resin plates can be directed toward the original illuminating unit without deforming the first and second two fluorescent resin plates. Accordingly, the same effect as in the above-described third and fourth embodiments can be obtained.

According to the sixth embodiment, the spiral fluorescent resin plate is arranged so as to surround a part of the outer peripheral portion of the fluorescent lamp, and the spiral reflector plate is arranged so as to surround the outer peripheral portion of the fluorescent resin plate. By arranging, among the light beams radiated around the fluorescent lamp, the light beam directed to the side opposite to the original illuminating unit side is made incident on the fluorescent resin plate, and the light beam passing through the fluorescent resin plate is reflected by the reflector plate. The light is reflected by the light source and made incident on the fluorescent resin plate again, so that the amount of light emitted from the end of the fluorescent resin plate can be increased. In addition, since the fluorescent glass plate surrounds the thin glass tube that composes the fluorescent lamp, it can be hardly broken by the impact from the outside of the lighting system, and even if the glass tube breaks, the glass shards scatter around. In this case, cleaning can be facilitated.

According to the seventh embodiment, the slit opening is provided at the center of the fluorescent resin plate composed of one flat plate,
The amount of light at the end in the longitudinal direction of the original illuminating section can be increased, whereby the illumination efficiency can be increased. Further, the number of fluorescent resin plates (the number of parts) is one sheet compared to each of the above-described first to fifth embodiments. The assembly work can be facilitated.

According to the eighth embodiment, a slit opening is provided in the center of a fluorescent resin plate made of one flat plate, and both ends in the longitudinal direction of the fluorescent resin plate are bent. With this arrangement, more light flux can be efficiently incident on the fluorescent resin plate at both ends, and the cut surface of the slit opening, which is the light emitting surface, faces the document illumination unit side. It is possible to increase the apparent light-emitting area seen from the part and also to improve the light quantity at both ends, thereby improving the illumination efficiency.

[Brief description of the drawings]

FIG. 1 is a perspective view of a main part of a first embodiment of the present invention.

FIG. 2 is a schematic view of a main part when viewed from the direction of arrow A in FIG. 1;

FIG. 3 is an enlarged explanatory view around the fluorescent resin plate of FIG. 2;

FIG. 4 is a schematic diagram of a main part of a second embodiment of the present invention.

FIG. 5 is an enlarged explanatory view around the fluorescent resin plate shown in FIG. 4;

FIG. 6 is a schematic diagram of a main part of a third embodiment of the present invention.

FIG. 7 is an enlarged explanatory view around an end of the first fluorescent resin plate shown in FIG. 6;

FIG. 8 is a schematic diagram of a main part of a fourth embodiment of the present invention.

FIG. 9 is an enlarged explanatory view around the first fluorescent resin plate shown in FIG. 8;

FIG. 10 is a schematic diagram of a main part of a fifth embodiment of the present invention.

FIG. 11 is an enlarged explanatory view around the fluorescent resin plate shown in FIG. 10;

FIG. 12 is a schematic diagram of a main part of a sixth embodiment of the present invention.

FIG. 13 is an explanatory view when the fluorescent resin plate of Embodiment 7 of the present invention is viewed from above and an enlarged explanatory view of a part thereof.

14 is a schematic diagram of a main part of a main part when the fluorescent resin plate shown in FIG. 13 is incorporated in a document illumination device.

15 is an enlarged cross-sectional view around a longitudinal end of the fluorescent resin plate shown in FIG. 14;

FIG. 16 is an explanatory view of the fluorescent resin plate according to the eighth embodiment of the present invention viewed from above, and an enlarged explanatory view of a part thereof.

17 is a schematic view of a main part of a main part when the fluorescent resin plate shown in FIG. 16 is incorporated in a document illumination device.

18 is an enlarged cross-sectional view around a longitudinal end of the fluorescent resin plate shown in FIG.

FIG. 19 is a schematic view of a main part of the image reading apparatus of the present invention.

FIG. 20 is a sectional view of a main part of a fluorescent lamp.

FIG. 21 is a perspective view of a main part of a main part of a conventional document illumination device.

FIG. 22 is a schematic diagram of a main part of a main part of a conventional document illumination device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Glass tube 2 Fluorescent paint application part 3 Opening part (window part) 4 First reflection shade 5 Original table glass 6 Original illumination part 7 Effective illumination light beam 8 Unnecessary light beam 9, 29 Light source (fluorescent lamp) 9a Fluorescent lamp base 10 Slit Openings 11, 31, 41, 51 First fluorescent resin plate 12, 32, 42, 52 Second fluorescent resin plate 13 Fluorescent resin plate with slit 14 Bent fluorescent resin plate with slit 15 Optical member (irregular reflection mirror) 16 Shielding part 17 Reflecting member 20 Fluorescent dye particles 21 Document 22 Spiral fluorescent resin plate 23 Spiral reflecting shade 25 Flat member (light shielding member)

Claims (34)

[Claims] 1. A document illuminating device for illuminating a reading area on a document surface placed on a document table glass in a slit shape with a light beam emitted from a light source having a long axis cylindrical shape, wherein the document illuminating device includes: A fluorescent resin plate obtained by dissolving a fluorescent dye in a transparent resin, and illuminating a reading area on the original surface using a light beam passing through the fluorescent resin plate. 2. The method according to claim 1, wherein the fluorescent resin plate is arranged at a position other than a reading area on the document surface, and one end of the fluorescent resin plate in a lateral direction is located near a reading region on the document surface. 2. The document illumination device according to claim 1, wherein the document illumination device is arranged. 3. A part of the light beam emitted from the light source, which is not directly incident on the reading area of the document surface, is incident on the fluorescent resin plate, and a part of the light beam emitted from an end of the fluorescent resin plate. 2. A reading area on the document surface is illuminated by using a light flux emitted from the light source and directly entering the reading area on the document surface.
Or the document illumination device of 2. 4. When the fluorescent resin plate is disposed near the platen glass, reflection processing is performed on an end surface other than near a reading area of the document surface and on a surface other than a surface on which a light beam from the light source is incident. 4. The method according to claim 1, wherein
Document illumination device. 5. A reading member is disposed near an end of the fluorescent resin plate on a side opposite to a reading region of the document surface, and the reflecting member is provided in the reading region of the document surface in light flux emitted from the light source. The light flux not directly incident on the original is reflected to the fluorescent resin plate side, and the reading of the original surface which is incident on the fluorescent resin plate and reaches the end opposite to the reading area side of the original surface inside the fluorescent resin plate is performed. 2. The original illuminating device according to claim 1, wherein a light beam that does not directly enter the region is reflected toward the fluorescent resin plate. 6. The original illuminating apparatus according to claim 1, wherein one end of the fluorescent resin plate in the short side direction is bent toward the reading area of the original surface. 7. The original illuminating apparatus according to claim 1, wherein a transmission diffusion process is performed on one end face of the fluorescent resin plate in the short direction. 8. The method according to claim 1, wherein one end of the fluorescent resin plate in the short side direction is bent toward the reading area of the document surface, and the end surface is subjected to transmission diffusion processing. Document illumination device. 9. A light shielding member for intercepting unnecessary light flux not contributing to image reading among light fluxes reflected on the document surface between the fluorescent resin plate and the document table glass. Item 2. The document illumination device according to Item 1. 10. The original illuminating device according to claim 1, wherein one end surface of the fluorescent resin plate in the short direction is inclined with respect to the original platen glass surface. 11. A light shielding member for intercepting unnecessary light flux not contributing to image reading out of the light flux reflected on the original surface between the fluorescent resin plate and the platen glass, and the fluorescent resin plate is provided. 2. The original illuminating apparatus according to claim 1, wherein one end face in the short side direction is inclined with respect to the glass surface of the original table, and the end face is subjected to transmission diffusion processing. 12. The image forming apparatus according to claim 11, wherein the fluorescent resin plate is arranged to be inclined with respect to the original platen glass surface such that an end surface of the original surface on the reading area side is inclined with respect to the original platen glass surface. The document illumination device according to claim 1. 13. An optical member having roof-shaped irregularities is arranged near a plane of the fluorescent resin plate on the platen glass side;
2. The original illuminating device according to claim 1, wherein a surface of the optical member on the side of the fluorescent resin plate is formed of a specular reflection surface or a diffuse reflection surface, and a surface of the original platen glass is light-shielded. 14. The fluorescent resin plate, wherein the fluorescent resin plate is disposed so as to be inclined with respect to the original platen glass surface such that an end surface of the original surface on the reading area side is inclined with respect to the original platen glass surface. An optical member having a roof-shaped unevenness is arranged near a plane on the platen glass side of the platen, and the surface of the optical member on the fluorescent resin plate side is formed of a specular reflection surface or a diffuse reflection surface, and the surface of the platen glass side 2. The original illuminating device according to claim 1, wherein a light-shielding process is performed on the surface. 15. The fluorescent resin plate has a slit opening in a part thereof, and allows a light flux of the light flux emitted from the light source through the slit opening, which is directly incident on the reading area of the document surface, to pass therethrough. Illuminating the reading area of the original surface, and of the light flux emitted from the light source, a light flux that is not directly incident on the reading area of the original surface is made to enter the fluorescent resin plate, and a slit opening of the fluorescent resin plate is formed. 2. The original illuminating device according to claim 1, wherein the reading area on the original surface is illuminated using a light beam emitted from a cross section. 16. The fluorescent resin plate according to claim 1, wherein an end surface other than a cross section of the slit opening and an end surface other than a surface on which a light beam from the light source is incident are subjected to reflection processing.
5. Document illumination device. 17. The document illuminating apparatus according to claim 15, wherein both ends in the longitudinal direction of said fluorescent resin plate are bent. 18. A document illuminator for illuminating a reading area of a document surface placed on a document table glass in a slit shape with a light beam emitted from a light source having a long-axis cylindrical shape, wherein an outer peripheral portion of the light source is provided. A spiral fluorescent resin plate obtained by dissolving a fluorescent dye in a transparent resin so as to surround a part of the fluorescent resin plate is disposed such that one end of the fluorescent resin plate is located near the reading area of the document surface. A spiral reflector surrounding the fluorescent resin plate and reflecting a part of a light beam radiated from the light source toward the reading area of the document surface; A document illuminating device, wherein a light-shielding process is performed on a surface of the reflection plate where the plate and the platen glass face each other. 19. A reflection member disposed in front of said light source to reflect a light beam that does not directly enter the reading area of said document surface to the reading area side of said document surface.
8. Document illumination device. 20. A document illuminating device for illuminating a reading area of a document surface placed on a document table glass in a slit shape with a light beam radiated from a light source having a long axis cylindrical shape, wherein the document illuminator includes And a fluorescent resin plate obtained by dissolving a fluorescent dye in a transparent resin at a position other than the reading area of the document surface, is cut into two first and second fluorescent resin plates, and each is disposed. A document illuminating device, wherein a reading area on the document surface is illuminated using a light beam passing through a resin plate. 21. The original illuminating device according to claim 20, wherein the cut surfaces of the first and second two fluorescent resin plates are arranged so as to be located near a reading area of the original surface. 22. A light beam emitted from the light source, which is directly incident on a reading area of the document surface, is passed through openings formed by the first and second fluorescent resin plates cut into the two portions, and the document surface is exposed. Of the luminous flux emitted from the light source and not directly incident on the reading area of the original surface, is incident on the first and second two fluorescent resin plates, and the first and second 21. The original illuminating device according to claim 20, wherein a part of the light flux emitted from the end portions of the two fluorescent resin plates is directed to a reading area on the original surface. 23. The first and second two fluorescent resin plates are subjected to a reflection process on an end surface other than a cut surface and an end surface other than a surface on which a light beam from the light source is incident. Item 21. The document illumination device according to Item 20. 24. A reflection member is disposed near an end of the first and second fluorescent resin plates opposite to a reading area side of the original surface of the first fluorescent resin plate, The reflecting member reflects the light flux of the light flux emitted from the light source, which is not directly incident on the reading area on the original surface, to the first fluorescent resin plate side, and is incident on the first fluorescent resin plate and the first fluorescent resin plate. The light flux that does not directly enter the reading area of the original surface and reaches the end of the original surface opposite to the reading area side inside the fluorescent resin plate is
3. The light is reflected to the side of the fluorescent resin plate.
0 document illumination device. 25. The original illuminating device according to claim 20, wherein the end portions of the first and second fluorescent resin plates on the cut surface side are each bent toward the reading area side of the original surface. 26. The document illuminating apparatus according to claim 20, wherein the cut surfaces of the first and second fluorescent resin plates are each subjected to transmission diffusion processing. 27. The end of the first and second two fluorescent resin plates on the cut surface side is bent toward the reading area side of the document surface, and the first and second two fluorescent resin plates are cut. 21. The original illuminating device according to claim 20, wherein the surfaces are subjected to transmission diffusion processing. 28. A light shielding member for intercepting an unnecessary light flux not contributing to image reading out of the light flux reflected on the document surface between the first fluorescent resin plate and the document platen glass. 21. The document illumination device according to claim 20, wherein: 29. The original illuminating apparatus according to claim 20, wherein cut surfaces of the first and second two fluorescent resin plates are respectively inclined with respect to the original platen glass surface. 30. A light-blocking member for blocking unnecessary light flux not contributing to image reading among light fluxes reflected on the document surface between the first fluorescent resin plate and the document table glass, 21. The original illuminating apparatus according to claim 20, wherein the cut surfaces of the first and second two fluorescent resin plates are respectively inclined with respect to the glass surface of the original table, and the cut surfaces are each subjected to transmission diffusion processing. . 31. The apparatus according to claim 31, wherein the first and second two fluorescent resin plates are arranged so as to be inclined with respect to the platen glass surface such that the cut surfaces thereof are inclined with respect to the platen glass surface. 21. The original illuminating device according to claim 20, wherein: 32. An optical member having a roof-shaped unevenness is arranged near a plane of the first fluorescent resin plate on the platen glass side of the first and second fluorescent resin plates, 21. The original illumination as claimed in claim 20, wherein a surface of the optical member on the first fluorescent resin plate side comprises a specular reflection surface or a diffuse reflection surface, and a surface on the platen glass side is light-shielded. apparatus. 33. The first and second two fluorescent resin plates are arranged so as to be inclined with respect to the platen glass surface so that the cut surface thereof is inclined with respect to the platen glass surface.
Of the first and second two fluorescent resin plates, an optical member having a roof-shaped unevenness is disposed in the vicinity of a flat surface of the first fluorescent resin plate on the platen glass side; 21. The original illuminating apparatus according to claim 20, wherein the surface on the side of the fluorescent resin plate of 1 is made of a specular reflection surface or a diffuse reflection surface, and the surface on the original platen glass side is subjected to a light shielding process. 34. An image using the document illuminating device according to claim 1, wherein image information of a document illuminated by the document illuminating device is read by a reading unit. Reader.