CN101420502A - Light source for image reading device and image reading device - Google Patents

Abstract

The invention provides a light source of an image reading device and an image reading device. The light source using electroluminescent body as the light medium is related to the position, especially the position in the long direction, for various important reasons. Therefore, the present invention provides a light source using an electroluminescent layer whose luminance is independent of position by adjusting the width and film thickness of the electroluminescent layer. Again, when red, green, and blue light are used as the optical medium of the color light source, in order to make the luminous brightness of each color electroluminescent body become the luminous luminance obtained for each color, the present invention provides an electroluminescent Layer width and film thickness are adjusted for the light source.

Description

Light source of image reading device and image reading device

This application is a divisional application of the patent application with the application number 02105116.X, the filing date is February 22, 2002, and the invention title is "Light source and image reading device for image reading device".

technical field

The present invention relates to a light source, and in particular to a light source for an image reading device.

Background technique

Copiers, scanners, printers and facsimile functions, or multi-function printers such as facsimile machines, copiers and printers, etc., equipped with images for reading the shape and position of characters and patterns drawn on paper, etc. ( Hereinafter referred to as the original) image reading device.

As the light source of the above-mentioned image reading device, a reduction optical method (reduction CCD method) has been known in the past, but this configuration has the advantage of being able to obtain a clear image even when the original is in a state where the original is separated from the original surface due to the large depth of focus of the lens. advantage. However, since the light source using the reduction optical method becomes large, it is necessary to consider the miniaturization and thinning of the light source. As shown in FIG. .

That is, the LED array 112 as a light source is arranged bilaterally symmetrically above the document surface 106 with respect to the rod lens array 121 , and the rod lens array 121 receives light irradiated on the document surface 106 . The LED array 112 has a configuration in which, for example, a plurality of LED elements 125 are arranged on a substrate 124 along the main scanning direction as shown in FIG. 31 . The overall length of the above-mentioned rod lens array 121 is the same as the overall length of the above-mentioned LED array 112. The rod lens array 121, for example, as shown in FIG. The substrate 124 is sandwiched.

Since such a configuration can reduce the distance between the document surface 106 and the rod lens 122 compared with the reduction optical method (reduction CCD method), the image reading device as a whole can be reduced in size.

Also, in order to reduce the focal length of the above-mentioned rod lens array 121 (rod lens 122), the diameter of the rod lens 122 can be reduced, but there is crosstalk between the rod lenses 122 when the diameter of the rod lens 122 is reduced. There is a disadvantage that the image projected on the sensor 108 is blurred due to the increase of optical noise such as effect and spot light. Therefore, the applicant of the present patent application proposed a configuration of a rod lens array (described later) with less optical noise than in Patent Application 2000-224156.

Further, since the above-mentioned LED array 112 is a collection of point light sources, a certain distance cannot be maintained between the document surface 106 and the LED array 112 and uniformity of illumination on the document surface 106 cannot be ensured. Due to this point, there is a limit to the thinning and miniaturization of the device using the above-mentioned attachment method of the LED array 112 . Therefore, the applicant of this patent application proposed using an electroluminescent light source for the purpose of thinning and miniaturization in patent application 2000-217561 and the like.

Such a configuration is shown, for example, in FIG. 33 . That is, a transparent electrode layer 103 is formed on a long transparent substrate 102 such as a glass substrate or transparent resin along the scanning direction, an electroluminescent layer 101 as an optical medium is formed on the transparent electrode layer 103, and an electroluminescent layer 101 is further formed on the transparent electrode layer 103. A metal electrode layer 104 is stacked on top. Then, the lead wires 111a, 111b are connected to the transparent electrode layer 103 and the metal electrode layer 104 .

Also, as a structure for realizing the color light source using the above-mentioned electroluminescent body, as shown in FIG. The composition of the electroluminescent layers 101r, 101g, 101b. In the case of a color light source, as shown in FIG. 34, either the transparent electrode layer 103 or the metal electrode layer 104 is used as a common electrode of the electroluminescent layers 101r, 101g, and 101b of each color. On the other hand, three individual electrodes corresponding to the respective electroluminescent layers 101r, 101g, and 101b constitute the other. Moreover, each lead wire is connected to the common electrode and each individual electrode, respectively.

In addition, the above electroluminescent layer 101 may be formed not only by vapor coating or the like used for general thin film formation, but also by printing, coating or the like.

Contents of the invention

According to the present invention, a light source for an image reading device is provided, in which a film layer is formed on a transparent substrate in the order of a transparent electrode layer, an electroluminescent layer, and a metal electrode layer, and light is emitted by applying a predetermined voltage to the above two electrode layers. , The light source of the image reading device is characterized in that: the width of the electroluminescent layer is a width corresponding to the distance from the connection point between the transparent electrode layer and the lead wire.

According to the present invention, a light source for an image reading device is provided, in which a film layer is formed on a transparent substrate in the order of a transparent electrode layer, an electroluminescence layer, and a metal electrode layer, and a predetermined voltage is applied to the above two electrode layers to perform the process. The light source of the image reading device is characterized in that a plurality of connection points between the transparent electrode layer and the lead wire are provided, and the electroluminescent layer is formed on the transparent electrode and the lead wire with a constant film thickness and width.

According to the present invention, a light source for an image reading device is provided, in which a film layer is formed on a transparent substrate in the order of a transparent electrode layer, an electroluminescence layer, and a metal electrode layer, and a predetermined voltage is applied to the above two electrode layers to perform the process. The light source of the image reading device is characterized in that at least a part of the outer peripheral portion of the transparent electrode layer is connected to a lead, and the electroluminescence is formed on the transparent electrode and the lead with a constant film thickness and width. layer.

According to the present invention, a light source for an image reading device is provided, in which a film layer is formed on a transparent substrate in the order of a transparent electrode layer, an electroluminescence layer, and a metal electrode layer, and a predetermined voltage is applied to the above two electrode layers to perform the process. Light emission, the light source of the image reading device is characterized in that: the R (red), G (green), B (blue) light emitting R, G, B electroluminescent body of each color constituting the above-mentioned electroluminescent layer The area is the area corresponding to the luminous ability of each color electroluminescent body and the necessary illuminance required to read an image.

According to the present invention, a light source for an image reading device is provided, in which a film layer is formed on a transparent substrate in the order of a transparent electrode layer, an electroluminescence layer, and a metal electrode layer, and a predetermined voltage is applied to the above two electrode layers to perform the process. Light emission, the light source of the image reading device is characterized in that: the R (red), G (green), B (blue) light emitting R, G, B electroluminescent body of each color constituting the above-mentioned electroluminescent layer The arrangement is an arrangement corresponding to the luminescence capability of each color electroluminescent body and the necessary illuminance required for reading an image.

According to the present invention, there is provided a light source for an image reading device. A luminescent layer is formed on a transparent substrate, and light is emitted from the surface and inside of the luminescent layer by applying a voltage. The light source of the image reading device is characterized in that: Two light source sheets forming the above-mentioned light-emitting layer are joined together as a light source.

According to the present invention, there is provided a light source for an image reading device, which is characterized in that: the light sources formed by joining together a plurality of light source sheets are arranged on the left and right sides of the lens, and the above-mentioned light sources arranged left and right are formed at different positions in the longitudinal direction of the lens joint of the piece.

As mentioned above, the electroluminescent body is used as the light source of the optical medium, and the luminous brightness is related to the position, especially the position in the long direction of the light source, due to various important reasons. One of these important reasons is the resistance of the electrode layer (particularly, the transparent electrode layer 103). Therefore, the luminescence brightness of the electroluminescent body at the part far away from the connection point P between the lead wire 111a and the transparent electrode layer 3, or the lead wire 111b and the metal electrode layer 4 is smaller than that of the electroluminescent body near the connection point P. In this way, when the luminance of the light source is not uniform, uniform illuminance cannot be obtained on the document surface 106, so the image density read by the sensor 108 is related to the position of the document.

Also, when using a colored light source to read images of various colors at equal concentrations, the luminous brightness required for each color electroluminescent body is different. For example, the material of the hole transport layer is TPD (Triphenyl-diamine, triphenyldiamine) , the material of the light-emitting layer is A1q3 (8-Hydroxyquinoline Aluminum, Hydroxyquinoline Al), and the luminance of each color of the electroluminescent body is G>R>B. Also, the luminance of the electroluminescent bodies of each color differs depending on the material of the electroluminescent bodies.

In this way, in order to make the electroluminescent bodies of each color emit light with the light emission brightness required for reading the image, electrical adjustment is necessary, but this requires additional hardware or software to the light source, which increases the cost of the light source.

In addition, as an important reason that the luminance of the light source depends on the position, we can also consider that the thickness of the electroluminescent body is scattered. This is because the luminous brightness is inversely proportional to the distance between the electrodes, that is, the distance between the transparent electrode layer 103 and the metal electrode layer 104 . Therefore, by using an electroluminescent body with a uniform thickness on the light source, the problem of scattered luminance can be solved. However, it is difficult to manufacture an electroluminescent body with a uniform thickness.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a light source using an electroluminescent body which makes the luminance of light emission uniform or the illuminance uniform on the surface of a document placed at a predetermined distance from the light source.

In the invention of the present application, with a light source using an electroluminescent body, in order to make the illuminance uniform on the original surface placed at a predetermined distance from the light source, as shown in Fig. 2 (a) and Fig. 3 (a), the The longer the distance between the lead wire and the connection point P of the transparent electrode layer or the metal electrode layer, the wider the electroluminescent body will be. Also, as another configuration for making the light source emit uniform luminance, the thickness of the electroluminescence layer becomes thinner as the distance from the connection point P becomes longer, and the connection point P is provided at a plurality of places on the light source. A structure in which leads are laminated on the outer periphery of the transparent electrode layer.

Also, when using a colored light source to read images of each color at equal concentrations, the luminescence capabilities of the electroluminescent layers of each color of the light of R (red), G (green), and B (blue) and the necessary illuminance required for reading images Accordingly, the areas of the electroluminescent layers of the three colors are increased or decreased.

This increase or decrease of the area is performed by adjusting the width of each electroluminescent layer of the three colors according to the luminous ability and required illuminance of the strip-shaped three-color electroluminescent layers having the same length in the longitudinal direction. For example, as shown in FIG. 12(a), three-color electroluminescent layers whose width and length are adjusted are arranged in parallel along the short direction, and as shown in FIG. A method for adjusting the length of the short direction of the 3-color electroluminescent body. Furthermore, by not only increasing or decreasing the area of the three-color electroluminescent bodies, but also adjusting the arrangement of the respective electroluminescent bodies, the illuminance on the document surface can be adjusted to the illuminance necessary for image reading.

Furthermore, manufacturing costs can be reduced by joining the light source sheets as shown in FIG. 14( a ) to manufacture a light source having a certain length or more.

Since the electroluminescent layer is not laminated on the end face of the light source sheet as shown in FIG. 14(a) for the sealing process, the luminance distribution of the light source formed by bonding the light source sheets is significantly reduced at the bonding portion. Therefore, by widening the width of the electroluminescence layer in the vicinity of the light source sheet bonding portion and reducing the film thickness, the emission luminance of the light source chip bonding portion is compensated.

Description of drawings

Fig. 1 is a cross-sectional view of a light source of the present invention.

Fig. 2 is a plan view showing a light source in which the width of the electroluminescent layer increases as the distance from the connection point increases.

Fig. 3 is a plan view showing a light source in which connection points are provided on both sides of an electroluminescent layer.

Fig. 4 is a diagram showing a light source in which the film thickness of the electroluminescent layer becomes thinner as the distance from the connection point becomes longer.

Fig. 5 is a diagram showing a light source in which connection points are provided on both sides of an electroluminescent layer.

Fig. 6 is a diagram showing a light source provided with a plurality of connection points.

Fig. 7 is a diagram showing a light source in which leads are laminated on the outer peripheral portion of the transparent electrode.

FIG. 8 is a graph showing the emission luminance distribution of a light source.

Fig. 9 is a diagram showing a light source in which a transparent electrode layer and a lead wire are connected at one point.

Fig. 10 is a diagram showing a light source in which leads are laminated on the outer peripheral portion of the transparent electrode.

FIG. 11 is a diagram showing a light source in which leads are laminated on the outer peripheral portion of the transparent electrode layer.

Fig. 12 is a diagram showing a light source in which the electroluminescent layers of each color have an area corresponding to the required luminance.

Fig. 13 is a plan view showing a light source in which electroluminescent layers of respective colors are repeatedly arranged along the longitudinal direction.

Fig. 14 is a diagram showing a light source constructed by joining light source sheets.

Fig. 15 is a diagram showing a partial cross section of a light source sheet.

Fig. 16 is a diagram showing a light source in which the width of the electroluminescent layer is large near the end face.

Fig. 17 is a diagram showing a light source whose end surface is inclined with respect to the short direction of the light source.

FIG. 18 is a diagram showing a light source composed of a substantially L-shaped light source sheet.

Fig. 19 is a cross-sectional view showing a light source sheet in which the film thickness of the electroluminescent layer is thin in the vicinity of the end face.

Fig. 20 is a diagram showing the structure of a light source sheet provided with a light-emitting layer at the center and light-emitting layers at the edges.

Fig. 21 is a diagram showing a light source device.

22 is a plan view of a light source device and a diagram showing an illuminance distribution at a reading position.

Fig. 23 is a plan view of a light source device and a diagram showing an illuminance distribution at a reading position.

Fig. 24 is a perspective view of a fiber lens.

Fig. 25 is a perspective view of an optical fiber constituting a fiber lens.

Fig. 26 is an X-X sectional view of the fiber lens.

Fig. 27 is a perspective view of a fiber lens.

Fig. 28 is a configuration diagram of a copier that performs double-sided reading.

Fig. 29 is a diagram showing an example of correction performed by the γ value of the reading correction device.

Fig. 30 is a block diagram of a conventional sealed image reading device.

Fig. 31 is a perspective view of a light source provided in a conventional sealed image reading device.

Fig. 32 is a perspective view of a rod lens array provided in a conventional sealed image reading device.

Fig. 33 is a perspective view of a conventional light source using an electroluminescent film.

Fig. 34 is a perspective view of a conventional light source using R, G, B three-color electroluminescent films.

Detailed ways

As shown in Fig. 1 and Fig. 2 (a), a transparent electrode layer 3 is stacked on a long transparent substrate 2 (such as a glass substrate and a film-like substrate) along the scanning direction, and the upper layer of the transparent electrode layer 3 The electroluminescence layer 1 used as an optical medium, and the metal electrode layer 4 laminated on the electroluminescence layer 1 are the same as conventional ones. Furthermore, the connection point P between the lead wires 10a, 10b and the transparent electrode layer 3 and the metal electrode layer 4 is provided at one end of the transparent electrode layer 3 and the metal electrode layer 4 in the longitudinal direction, which is also the same as the conventional one.

The width of the electroluminescent layer 1 of the present invention becomes wider as the distance from the connection point P increases as shown in FIG. 2( a ). That is, as the distance from the connection point P increases, the resistance of the electrode (especially the resistance of the transparent electrode layer 3) increases, and when the width of the electroluminescent layer 1 is made constant, the distance from the above-mentioned connection point P increases. , the brightness becomes smaller (the electric field strength between the electrodes becomes smaller). Therefore, in order to make the illuminance on the document surface uniform, the above configuration can be adopted.

For example, the above-mentioned transparent electrode layer 3 is formed by an ITO (Indium Tin Oxide, indium tin oxide) electrode with a thickness of 0.15 μm, and the above-mentioned electroluminescence layer 1 is composed of a TPD layer (thickness is 0.05 μm) and a layer as a hole transport layer. An Alq3 layer (0.05 μm in thickness) as a light-emitting layer deposited on the TPD layer was formed, and the metal electrode layer 4 was formed of an Al-Li alloy with a thickness of 0.15 μm.

In this configuration, the connection point P is provided at one end in the longitudinal direction of the above-mentioned transparent electrode layer 3 and the metal electrode layer 4, and in the case where the length in the long direction (scanning direction) of the above-mentioned electroluminescent layer 1 is 160 mm When making the narrow direction width of the electroluminescent layer 1 be 2mm, and when the width direction width is 6mm, the illuminance of the manuscript surface is independent of the position of the long direction of the light source 5 when it is placed at a predetermined distance away from the above-mentioned transparent substrate 2.

Also, as the structure of the light source 5 of the present invention, as shown in FIG. For example, when connecting point P is arranged on two transparent electrode layers 3, when the end portion side of the long direction of transparent substrate 2 of metal electrode layer 4, as shown in Fig. 3 (a), along with approaching transparent substrate In the central portion of the sheet 2 in the longitudinal direction, the two electroluminescent layers 1 have a shape in which the width increases. Therefore, the illuminance of the document surface placed at a predetermined distance from the above-mentioned transparent substrate 2 has nothing to do with the position of the light source 5 in the longitudinal direction.

In this structure, when the above-mentioned connection point P is arranged on the two transparent electrode layers 3, the ends of the long direction of the transparent substrate 2 on the metal electrode layer 4, the long direction of the two above-mentioned electroluminescent layers 1 When the length is 80mm, by making the width of the above-mentioned electroluminescent layer 1 of the narrow side be 2mm, the width of the wide side (central part of the transparent substrate 2) is 4mm, can make to be placed on the predetermined distance from the above-mentioned transparent substrate 2. The illuminance of the document surface at the position of is independent of the position of the light source 5 in the longitudinal direction.

Furthermore, as a structure for preventing the above-mentioned decrease in luminance, a structure in which the electroluminescence layer 1 becomes thinner as the distance from the connection point P increases as shown in FIG. 4( a ) may be considered. That is, since the electric field intensity decreases according to the distance from the above-mentioned connection point P, when the film thickness is reduced corresponding to the decrease of the electric field intensity, the electric field intensity applied between the transparent electrode layer 3 and the metal electrode layer 4 can be kept uniform. , so that it is possible to prevent a decrease in luminous brightness.

In the structure shown in Fig. 4 (a), for example, the transparent electrode layer 3 is formed by an ITO electrode with a thickness of 0.15 μm, and the electroluminescent layer 1 is formed by an ITO electrode whose thickness is 0.3 μm on the thick side and 0.1 μm on the thin side. The luminescent body is formed, and the metal electrode layer 4 is formed of Al-Li alloy with a thickness of 0.15 μm.

In this structure, the connection point P is arranged on the transparent electrode layer 3, one end of the long direction of the metal electrode layer 4, when the length of the long direction of the above-mentioned electroluminescent layer 1 is 160mm, the luminous brightness and long direction can be obtained. A position-independent light source.

Again, as shown in Figure 5 (a), when laminating two transparent electrode layers 3 on the transparent substrate 2, the electroluminescent layer 1 and the metal electrode layer 4, the above-mentioned connection point P is arranged on each transparent electrode layer 3, The film thicknesses of the two electroluminescent layers 1 become thinner toward the center of the transparent substrate 2 in the longitudinal direction on the metal electrode layer 4 at the end in the longitudinal direction of the transparent substrate 2 .

In this structure, when the length of the longitudinal direction of the above-mentioned electroluminescent layer 1 is 160 mm, by setting the thickness of the thick side to 0.2 μm and the thickness of the thin side to 0.1 μm, the luminous brightness can be obtained regardless of the distance in the long direction. light source.

Also, the film thicknesses of the hole transport layer (TPD layer) and the light-emitting layer (Alq3 layer) of the electroluminescent layer 1 shown in FIG. 4(a) and FIG. 5(a) have the same thickness in any part. .

Fig. 6(a) is a plan view showing another embodiment of the present invention. The configuration shown in FIG. 6( a ) is a configuration in which not only the connection points P are provided at the ends of the transparent electrode layer 3 and the metal electrode layer 4 in the longitudinal direction as described above, but also a plurality of connection points P are provided. Therefore, even without adjusting the film thickness and width of the electroluminescent layer 1 as described above, it is possible to obtain a light source whose emission luminance is independent of the position in the longitudinal direction.

Further, from this point of view, the configurations shown in Fig. 7(a), (b) may also be considered. A plurality of transparent electrode layers 3 of 3 mm in the long direction and 2.5 mm in the short direction are laminated on the transparent substrate 2 , and lead wires 10 a are laminated on the entire outer peripheral portion of each transparent electrode layer 3 . Further, it is also conceivable to layer an insulating film 12 such as polyimide on the side of the electroluminescent layer 1 where the lead 10a is laminated, to layer the electroluminescent layer 1 on the transparent electrode layer 3 and the insulating film 12, and further On this electroluminescent layer 1, the metal electrode layer 4 common to all the electroluminescent layers 1 to be laminated is laminated.

In this configuration, since the lead wire 10a is connected to the entire outer peripheral portion of the transparent electrode layer 3, the electric field caused by the transparent electrode layer 3 can be greatly reduced compared with the configurations in FIGS. decrease in strength. Again, the insulation between the lead wire 10a and the electroluminescent layer 1 is because, even if the electroluminescent layer 1 in the upper portion of the lead wire 10a on FIG. The chip 2 runs to the outside, and no current flows in the upper portion of the lead 10a.

In the structure shown in FIG. 7(a), for example, the transparent electrode layer 3 is formed of an ITO electrode with a thickness of 0.15 μm, and the electroluminescence layer 1 is formed of a TPD layer (0.05 μm in thickness) as a hole transport layer and a laminated layer. An Alq3 layer (0.05 μm in thickness) as a light emitting layer was formed on the hole transport layer, and the metal electrode layer 4 was formed of an Al—Li alloy with a thickness of 0.15 μm. In the case where the length in the longitudinal direction of the above-mentioned electroluminescent layer 1 is 160 mm, the emission luminance distribution of the electroluminescent layer 1 is formed such that the outer peripheral portion of the electroluminescent layer 1 is higher and the central portion is lower as shown in FIG. 8( a). state.

Also, as shown in FIG. 9, the luminous brightness distribution when the above-mentioned transparent electrode layer 3 and the lead wire 10a are connected through a connection point P is higher as shown in FIG. Decreases as the distance increases.

Fig. 8 (a), the B area shown in (b), C area, D area, E area, F area, the electroluminescent body in the G area compares with the luminous brightness of the electroluminescent body of place A, low 0% to -0.5%, -0.5% to -1.0%, -1.0% to -2.0%, -2.0% to -4.0%, -4.0% to -7.0%, -7.0% to -10%. Therefore, as shown in Fig. 8(a) and (b), when the lead 10a is laminated on the entire outer peripheral portion of the transparent electrode layer 3, the variation in the luminance of the electroluminescent layer 1 can be reduced.

In the above description, we have described the case where the lead wire 10a is laminated on the entire outer peripheral portion of the transparent electrode layer 3 as shown in FIG. . The distribution of the emission luminance of the electroluminescence layer 1 at this time is as shown in FIG. 8(c).

Again, when sending out R (red), G (green), B (blue) each color electroluminescent layer 1r of light, 1g, 1b when being used as optical media, make 3 color electroluminescent layer 1r, 1g, 1b and transparent substrate The sheets 2 are stacked on the transparent electrode layer 3 so that they are arranged side by side in the short direction. The configurations when the electroluminescent layers 1r, 1g, and 1b are used as the optical medium of the light source shown in FIGS. 2(a) to 6(a) are shown in each (b) of FIGS. 2 to 6. Also, in the configuration with the electroluminescence layer 1r, 1g, and 1b, the configuration becomes the above-mentioned shape of the electroluminescence layer 1 and the connection state of the lead wires 10a, 10b and the transparent electrode layer 3 and the metal electrode layer 4. With the same configuration as above, it is possible to compensate the decrease in the luminance of each color electroluminescent layer 1r, 1g, 1b, or to make the illuminance uniform on the surface of a document placed at a predetermined distance from the light source.

In addition, the arrangement of the electroluminescent layers 1r, 1g, and 1b may not be as shown in FIGS. 2(b) to 6(b). Also, in the structure shown in FIG. 7(a), when using the above-mentioned three-color electroluminescent layers 1r, 1g, and 1b, for example, as shown in FIG. 3 are laminated multiple times in the long direction of the transparent substrate 2, on the plurality of transparent electrode layers 3, therefore, on the multi-layered transparent electrode layers 3, in order to alternately arrange various colors in the long direction of the transparent substrate 2 Electroluminescent Layers 1r, 1g, 1b The electroluminescent layers 1r, 1g, 1b of the respective colors are laminated in the longitudinal direction of the transparent substrate 2. FIG.

(Embodiment 2)

The colored light source 5 with electroluminescent body has for example shown in Fig. 12 (a), (b) on transparent substrate 2 lamination transparent electrode layer 3, on transparent electrode layer 3 lamination electroluminescent layer 1r, 1g, 1b , further stacking the metal electrode layer 4 on the electroluminescence layer. Again, the electrode is to use the transparent electrode layer 3, any one of the metal electrode layer 4 as the common electrode of the electroluminescent layer 1r, 1g, 1b, and use the other as the common electrode of each electroluminescent layer 1r, 1g, 1b. Electrode constitutes a single electrode. Also, lead wires 11, 11r, 11g, and 11b are connected to the common electrode and the individual electrodes. In addition, in this embodiment, the transparent electrode layer 3 is used as an individual electrode, and the metal electrode layer 4 is used as a common electrode.

Here, the electroluminescent layers 1r, 1g, and 1b are laminated side by side in the short direction as shown in FIG. The illuminance on the document surface necessary for image reading determines the width of the electroluminescent layers 1r, 1g, 1b.

For example, in an image reading device in which the illuminance on the original surface necessary for reading an image is R: 900cd/m ² , G: 2000cd/m ² , and B: 500cd/m ² , the luminous brightness is R: 400cd/m 2 . m ² , G: 2000cd/m ² , B: 400cd/m ² electroluminescent layers 1r, 1g, 1b, theoretically, the ratio of the width (light emitting area) of the electroluminescent layers 1r, 1g, 1b of each color is the most Preferably 1r:1g:1b=2.25:1:1.25.

However, because of various important reasons, the width of the light source is not proportional to the illuminance at a position at a predetermined distance from the light source, so the ratio of the width of the electroluminescent layer 1r, 1g, 1b is 1r:1g:1b=2.8:1: 1.5.

For example, when using a thickness of 0.1 μm and a length of 160 mm in the longitudinal direction, the R, G, and B color electroluminescent layers 1r, 1g, and 1b are used as the light source of the image reading device, and the R, G, and B color electroluminescent layers The widths of 1r, 1g, and 1b are R=2.8mm: G=1.0mm: B=1.5mm.

In the configuration shown in FIG. 12(a)(b), the strip-shaped electroluminescent layers 1r, 1g, and 1b of each color are stacked side by side on the transparent electrode layer 3 in the short direction, but as shown in FIG. A plurality of electroluminescent layers 1r, 1g, 1b of respective colors having the same length in the long direction of the transparent substrate 2 are laminated on the long direction of the transparent substrate 2.

For example, in the light source of an image reading device whose illuminance on the original surface necessary for reading an image is R: 900cd/m ² , G: 2000cd/m ² , and B: 500cd/m ² , use the In the case of a light source, when the luminance of the electroluminescent layer 1 of each color of the light source is R: 400cd/m ² , G: 2000cd/m ² , and B: 400cd/m ² , the above-mentioned electroluminescent layers 1r, 1g, The ratio of the length in the short direction of the transparent substrate 2 of 1b is 1r:1g:1b=2.8:1:1.5.

In the structure shown in Fig. 13, for example, make each electroluminescence layer 1r, 1g, the length of 1b in the long direction of transparent substrate 2 be 0.3 mm, the thickness is 0.1 μ m, in the short direction 1r=2.8mm: 1g = 1.0mm: 1b = 1.5mm, these electroluminescent layers 1r, 1g, 1b of each color are arranged alternately in the longitudinal direction of the transparent substrate 2, so that the total length of the electroluminescent layer 1 is 160mm.

By adjusting the light emitting areas of the electroluminescent layers 1r, 1g, and 1b of the R, G, and B colors as described above, it is possible to obtain the illuminances of the R, G, and B colors necessary for reading an image on the document surface.

Again, because the luminous brightness of each color electroluminescent layer 1r, 1g, 1b is related to the material of the electroluminescent layer 1, it is different, so the ratio of the width (light emitting area) of the above-mentioned electroluminescent layer 1r, 1g, 1b to the material Related is different.

(Embodiment 3)

It is technically difficult to manufacture an electroluminescent body having a uniform thickness over a certain length. Therefore, the light source sheets 50 shown in Fig. 14(a) and (b) are joined to form a long light source 5 using electroluminescence as an optical medium.

As shown in Fig. 14(a), (b), the above-mentioned light source sheet 50α, 50β.... has an upper layer that divides the length of the long direction of the light source 5 into a plurality of long transparent substrates 52α, 52β.... Lay transparent electrode layers 3α, 3β...., laminate electroluminescent layers 1α, 1β.... on them, and further laminate metal electrode layers 4α, 4β.... on the electroluminescent layer constitute.

Further, the leads 10a are connected to the transparent electrode layers 3α, 3β... of the light source sheets 50α, 50β..., and the leads 10b are connected to the metal electrode layers 4α, 4β....

However, because the electroluminescent body used above is easily affected by humidity, sealing treatment is required to prevent moisture from entering the light source sheets 50α, 50β, . . . , and to further prevent the electroluminescent body from being physically damaged. That is, the light source sheets 50α, 50β, . . . are fabricated as follows.

As shown in FIG. 15 , first, apart from the sealing portion 7α which is 0.3 to 0.5 mm away from the end face of the transparent substrate 52α, as mentioned above, the above-mentioned transparent electrode layer 3α, the electroluminescent layer 1α, and the metal electrode layer 4α are laminated. . Next, an adhesive resin 8 such as epoxy resin for sealing treatment is applied to the sealing treatment portion 7α. Finally, sealing glass 9α is coated on metal electrode layer 4α and epoxy resin 8 .

The light source sheets 50α, 50β, . Therefore, the transparent electrode layers 3α, 3β..., the metal electrode layers 4α, 4β... or the electroluminescent layers 1α, 1β... The length (approximately 80 mm) of the longitudinal direction of each light source sheet 50α, 50β ... within the limit of the light source 5 can be placed on the original surface at a predetermined distance from the light source regardless of the length of the light source. Uniform illuminance .

(Embodiment 4)

However, the shape of the electroluminescent layers 1α, 1β.... of the light source sheets 50α, 50β.... of FIG. The short directions of the light source sheets 50α, 50β, . . . are parallel. Therefore, when the light source sheets 50α, 50β, . Therefore, the luminance distribution of the light source 5 in which the light source sheets 50α, 50β, . Therefore, in the present embodiment, it is configured by compensating for such attenuation of emission luminance as follows.

Fig. 16 is a diagram showing this embodiment. The width of the electroluminescence layer 1 within 10 mm from the end portion 56 of each light source sheet 50α, 50β, . . . is wider than that of other portions.

Therefore, by making the width of the electroluminescent layers 1α, 1β, ... smaller at the central portion of the light source sheet 50α, 50β, ..., and larger at the end, the light source sheets 50α, 50β, ... The attenuation of the luminous brightness near the end face 56 is compensated.

(Embodiment 5)

Fig. 17 is a structural diagram showing yet another embodiment of the present invention. In the embodiment, since the shape of the electroluminescent layer 1 of the light source sheet 50 is rectangular, the luminance near the end face 56 is almost zero. Therefore, when the end surface 56 is configured to have a certain angle with respect to the short direction of the transparent substrate 52, the above disadvantage can be alleviated. That is, as shown in Fig. 17, the shapes of the light source sheets 50α, 50β, ... and the electroluminescent layers 1α, 1β, ... are parallelograms. For example, when the light source sheets 50α and 50β are joined together, the light source sheet 50α and the light source sheet 50β are overlapped in the short direction. Since the sealed portions 7α, 7β constituting the above-mentioned electroluminescent layers 1α, 1β form a distribution extending in the longitudinal direction, it is possible to prevent the sealed portions 7 from concentrating on a specific portion.

Again, because the luminous brightness of the light source 5 joined by such parallelogram-shaped light source sheets 50α, 50β.... The overlapping length Q of the layers 1β is at least 5 times the distance I between the electroluminescent layers 1α, 1β (the length of the missing portion 40). In addition, it is desirable that the width W of the electroluminescent layers 1α, 1β is not more than 1.7 times the overlapping length Q.

In addition, as shown in FIG. 18 , the light source sheet 50 may have a substantially L-shaped configuration. In such a configuration, the width of the light source is also wider at the overlapping portion J where the electroluminescent layer 1α of the light source sheet 50α and the electroluminescent layer 1β of the light source sheet 50β overlap. By enlarging the width of the light source 5, the width of the electroluminescent layer 1 at the overlapping portion J can be increased.

In the configuration shown in FIG. 18 , in order to obtain a light source whose luminance is independent of the longitudinal direction, it is desirable that the length M of the longitudinal direction of the light source 5 where the electroluminescent layer 1α and the electroluminescent layer 1β overlap is between the electroluminescent layers 1α and 1β. More than 5 times the distance K between them.

Further, in order to reduce the reduction of the luminous brightness of the joint portion, it is desirable to have, for example, as shown in FIG. The center of the light source 5 in the short direction is decentered. When the missing portion 40 is decentered, it is desirable to make the width S of the convex portion formed at one end of the light source sheet 50α, 50β, .

(Embodiment 6)

The luminous brightness of the light source sheets 50α, 50β. . . also varies with the electric field intensity of the electroluminescent layers 1α, 1β. . That is, on the basis of the same potential between the electrodes, as the film thickness of the electroluminescent layer 1 becomes thinner, the electric field intensity becomes larger, and the luminance of the electroluminescent layers 1α, 1β, . . . increases. Therefore, as shown in FIG. 19, the object of the present invention can be achieved if the film thickness of the electroluminescent layer 1 within 10 mm from the end face 56 is thinner than the central part.

(Embodiment 7)

Furthermore, in order to compensate the luminance of the junction portion, as shown in FIG. 20, the electroluminescence layer 1 may be composed of end emission layers 12 and central emission layers 11 made of electroluminescent material.

For example, within 5mm away from the sealed portion 7 of the transparent substrate 52, the transparent electrode layer 32 of the above-mentioned end light-emitting layer 12 is laminated, the end light-emitting layer 12 is laminated on the transparent electrode layer 32, and the end light-emitting layer is further formed. The metal electrode layer 42 of the end light emitting layer 12 is laminated on the 12 . Also, from the above-mentioned end light-emitting layer 12 to the inside of the transparent substrate 52, the transparent electrode layer 31 of the above-mentioned central part of the light-emitting layer 11 is laminated, the central part of the light-emitting layer 11 is laminated on the transparent electrode layer 31, and further on the central part of the light-emitting layer. The metal electrode layer 41 of the light-emitting layer 11 in the center is laminated on the metal electrode 11. In addition, the above-mentioned transparent electrode layers 31, 32 are connected to the lead wire 10a, and the above-mentioned metal electrode layers 41, 42 are connected to the lead wire 10b.

Here, in order to obtain a certain luminous brightness at the joint portion, the light emission control device H that controls the light emission of the central light emitting layer 11 and the end light emitting layer 12 is connected to the transparent electrode layer 32 of the end light emitting layer 12 through the lead wires 10a, 10b. A higher voltage is applied between the transparent electrode layer 31 and the metal electrode layer 42 than between the transparent electrode layer 31 and the metal electrode layer 42 of the light-emitting layer 11 in the central portion. Therefore, even if the light emitting luminance of the end light emitting layer 12 is increased to form the light source 5 by bonding such light source sheets 50 , the light emitting luminance of the light source 5 does not depend on the longitudinal direction.

Furthermore, in order to obtain the light source 5 that emits light with uniform brightness along the longitudinal direction, the light emitting layer 12 at the end portion may be thinner than the light emitting layer 11 at the central portion.

(Embodiment 8)

When the light source 5 configured as above is used as the light sources 5a and 5b of the image reading device described below, usually, R, G, and B are sequentially illuminated to read the image data of each color, and finally the read color data synthesized. As a special usage method, there is also a usage method in which reading processing is performed by lighting a specific color, and image reading of the specific color is not performed. The specific color at this time may be any one of R, G, and B described above, or may be a combination of R, G, and B colors.

When the light source 5 configured as above is used as a light source of an image reading device such as a copier, for example, as shown in FIG. In addition, the fiber lens 14 described later is arranged above the reading position Pa in the vertical direction.

In this structure, because the light sources 5a and 5b related to the invention of this patent application are surface-emitting, even if the light sources are brought close to the reading position Pa, the illuminance on the reading position Pa is also the same as the longitudinal direction of the light sources 5a and 5b. irrelevant. By bringing the light sources 5a, 5b close to the reading position Pa, it is possible to reduce the size of the light source device 15 composed of the light sources 5a, 5b and the fiber lens 14 . Furthermore, by reducing the size of the light source device 15, the image reading device as a whole can also be reduced in size.

Therefore, in the case where the LED array 112 ( FIG. 21 ) is used for the light sources 5a, 5b of the light source device 15, when the distance between the central portion O of the LED element 125 and the reading position Pa is 7mm or less, at the reading position Pa , can not get a uniform illuminance. However, when the light source 5 of the present invention is used, even if the distance between the central portion O and the reading position Pa is close to 1 mm, it has been confirmed by experiments that uniform illuminance can be obtained.

21, the smaller the angle θ formed by the line L connecting the central portion O of each electroluminescent layer 1 of the light source 5a, 5b and the reading position Pa and the original document surface 6 is, the lower the reading position Pa will be. The lower the illuminance is, and the larger the angle θ is, the larger the proportion of spot light is in the light incident on the fiber lens 14, and the image becomes less vivid.

When the angle θ is 40° to 55°, the illuminance at the reading position Pa is relatively high, and the amount of reflected light incident on the fiber lens 14 is relatively small. Therefore, by arranging the light sources 5a and 5b such that the angle θ is 40° to 55°, the illuminance and the MTF (modulation transfer function) value at the reading position Pa are relatively high. Also, the MTF value is called the resolution of the sensor.

Therefore, when using colored light sources as the light sources 5a, 5b, it is preferable to make the angle θ formed by the straight line L connecting the central part O of each electroluminescent layer 1r, 1g, 1b and the reading position Pa and the original surface 6 be 40°. The light source 5 is arranged so that it is ˜55°.

Also, it is particularly preferable to connect the electroluminescent layer 1 of the color requiring the largest light emitting area from the above-mentioned relationship between the luminance of light emission and the illuminance on the original surface necessary for reading the image, in the above case, the field of red. The light source 5 is arranged such that the angle θ formed by the straight line L between the central point O of the luminescent layer 1r and the reading position Pa and the document surface 6 is 40° to 55°.

In addition, when the angle θ formed by the straight line L connecting the central part O of the electroluminescent layer 1r and the reading position Pa and the document surface 6 is 40° to 55°, it is desirable to laminate the electroluminescent layer 1r on the In the central portion of the transparent substrate 2, the electroluminescent layers 1g and 1b are laminated so as to be adjacent to the electroluminescent layer 1r in the short direction of the electroluminescent layer 1r.

In addition, the amount of reflected light incident on the fiber lens 14 depends not only on the angle θ but also on the material of the document.

(Embodiment 9)

In the light source 5 shown in FIGS. 14 to 20 , the missing portion 40 is formed at the joint portion of the light source sheet 50 . When the light source 5 shown in FIGS. 14 to 20 is used as the light source 5a, 5b of the light source device 15, as shown in FIG. At the same position in the longitudinal direction, for example, the light source 5 a is arranged such that the light source 5 a is displaced by a certain distance in the longitudinal direction of the fiber lens 14 . At this time, when the total length of the light sources 5a, 5b is 320mm, and the length of the missing parts 40a, 40b of the light sources 5a, 5b is 1 mm, it is preferable to separate the missing parts 40a, 40b by more than 2 mm in the longitudinal direction of the fiber lens 14.

By arranging in this way, as shown in FIG. 23( a), the light sources 5a, 5b are arranged in such a way that the missing parts 40a, 40b are at the same position in the longitudinal direction of the fiber lens 14, and the missing part 40a , 40b causes the smallest drop in illuminance at the reading position Pa.

Fig. 22(b) and Fig. 23(b) show the illuminance distribution at the reading position Pa when the light source is arranged as shown in Fig. 22(a) and Fig. 23(a).

Also, as a configuration in which the missing portion 40a and the missing portion 40b are disposed at positions separated from each other in the longitudinal direction of the fiber lens 14, in addition to the configuration in which the light sources 5a, 5b are moved away as described above, there is also a light source sheet that will be smaller than other light source sheets. The 50 short light source sheet 50 is used as the light source sheet 50 at both ends of the light source 5a or the light source 5b.

(Embodiment 10)

In the configuration of FIG. 21 , in order to keep the depth of focus of the fiber lens 14 deep, in order to bring the fiber lens 14 close to the reading position Pa, it is necessary to make the diameter of the optical fiber constituting the fiber lens 14 smaller than that of the existing rod. The diameter is small, or the distance (conjugate length) T between the document surface 6 and the sensor 8 shown in FIG. 21 is lengthened. In the existing rod lens, since the reduction in diameter is limited, the depth of focus can be kept deep by increasing the conjugate length T. However, when the conjugate length T is increased in this way, it violates the In order to achieve the purpose of thinning and miniaturizing the image reading device.

Therefore, as shown in FIG. 24, the fiber lens 14 is constituted by bundling optical fibers 140 having a thin diameter, that is, 0.5 mm or less. Therefore, the focal length of the fiber lens 14 can be shortened and the depth of focus can be deepened, the overall optical path length can be suppressed, and the image reading device can be made thinner and smaller. Waiting for the phenomenon to become obvious. Therefore, as shown in FIG. 25, a light absorbing layer 143 is formed on the outer periphery of each monomer of the optical fiber 140 of a predetermined length, or as shown in FIG. A light absorbing layer 141 is formed on the outer periphery to constitute an optical fiber bundle 144 .

Here, in order to prevent the above-mentioned phenomenon of intermodulation and light spots, the above-mentioned optical fiber bundle 144 satisfies the following relationship. That is, as shown in FIG. 26 , the value ratio obtained by dividing the length (outer diameter) Y of one side of the optical fiber bundle 144 by the length N of the optical fiber 140 is the opening of the angle between the central axis Z of the optical fiber 140 and the incident light V. The outer diameter Y, the length N, and the opening angle ω are set such that the tangent of the angle ω is small.

A plurality of such optical fibers 140 forming the light absorbing layer 143 or a plurality of optical fiber bundles 144 forming the light absorbing layer 141 are filled in parallel in the radial direction with the longitudinal direction of the optical fibers 140 facing up and down, into a predetermined shape that is open up and down. In the molding frame, the gaps between the optical fibers 140 are filled with adhesive and cured, and then the frame is removed. The predetermined shape of the forming frame is a shape required for the original function of an image reading device such as a copying machine using the fiber lens 14, and is usually formed in a long strip shape at right angles to the document conveyance direction. Further, as shown in FIG. 27, if needed in molding, the above-mentioned optical fiber 140 monomer or optical fiber bundle 144 can also be put into the above-mentioned molding frame, and clamped with a substrate 142 such as opaque glass or resin, and the above-mentioned method can be used to The substrate 142 and the above-mentioned optical fiber 140 are bonded to each other alone or the substrate 142 and the optical fiber bundle 144 are bonded to each other.

In addition, there are also a plurality of optical fibers 140 forming the light absorbing layer 143 or a plurality of optical fiber bundles 144 forming the light absorbing layer 141, for example, closely arranged side by side in the radial direction along the length direction of the optical fibers 140, and using an adhesive A method of filling the gap, sandwiching two opaque glass or resin substrates 142 of a predetermined shape, and curing the adhesive by thermocompression bonding (not shown in the figure).

The refractive index of the above-mentioned optical fiber 140 gradually decreases toward the outer periphery in a direction perpendicular to the axis. Even without the above-mentioned light-absorbing layer 141·143, the light will converge toward the center in principle. However, as a practical problem, when the diameter becomes thinner , the phenomena such as the above-mentioned intermodulation effect and light spot become remarkable, and it is necessary to form the above-mentioned light absorbing layer 141·143.

In addition, the above-mentioned light absorbing layers 141·143 can be formed by coating, impregnating or evaporating black resin. Again, the adhesive used to fill the optical fiber 140 monomer or the optical fiber bundle 144 into the above-mentioned molding frame can also be an existing adhesive, but it is best to use the adhesive that can prevent the above-mentioned intermodulation and A black or other adhesive that causes a phenomenon such as a flare to form the above-mentioned light-absorbing layer 141 . Here, when the above-mentioned black adhesive is also used as the light-absorbing layer, the adhesive is formed on the outer periphery of the above-mentioned optical fiber 140 single body or optical fiber bundle 144, and a molding frame of a predetermined shape that is open up and down can be used as above. The above-mentioned fiber lens 14 is manufactured by a method of sandwiching two substrates 142 and performing thermocompression bonding. Of course, in this manufacture, the above-mentioned black adhesive or the like is formed on the entire periphery of the optical fiber 140 single body or the optical fiber bundle 144 . As the above-mentioned binder, for example, glass or resin with a low softening point can be used, but this softening point must be lower than the softening point of the materials of the optical fiber 140 and the substrate 142 constituting the above-mentioned optical fiber lens 14 .

Here again, when the diameter of the optical fiber 140 provided by the above-mentioned optical fiber lens 14 is about 0.1mm of 1/6 of the diameter of the existing rod lens, and the length of the optical fiber 140 is about 4.0mm of 1/6 of the length of the rod lens, FIG. The reading devices 120a and 120b shown at 28 have a thickness in the direction perpendicular to the surface of the document 9 which is about 10 mm, 1/6 of that of a conventional sealed image reading device.

Fig. 28 is a diagram showing an image reading device to which the invention of the present application is applied, and in this case, it is configured to be able to read both sides of the front and back. Of course, such an image reading device can be used in both facsimile machines and copiers.

As in the prior art, the document 9 introduced into the device by the pickup roller 151 constituting the document conveying unit 162 is sent into the horizontal conveyance path 133 by the upper and lower feed rollers 152a·152b. On this transport path 133, a belt pulley 164 is provided to transport the original document backward after receiving the original document 9 from the upper and lower feed rollers 152a·152b.

Two upper and lower reading devices 120a·120b are arranged near the front end of the horizontal conveyance path 133, and both sides of the original 9 are simultaneously read at the upper and lower reading positions Pa·Pb when the original 9 is conveyed.

Here, the lower reading device 120 b is used to read a document protruding from the document surface 136 , such as a book in an open state, and requires a deep depth of focus. Therefore, by using the fiber lens 14 shown in FIG. 24 and the light source 5 of the present invention for the lower reading device 120b, the entire reading device can be designed to be considerably thinner. Of course, by using the fiber optic lens 14 shown in FIG. 24 and the light source 5 of the present invention for the reading devices 120a and 120b on the upper and lower sides, it is possible to further reduce the thickness of the image reading device.

As described above, when the images on both sides of the original document 9 are read, when the irradiation lights from the light sources of the reading devices 120a and 120b on the upper and lower sides irradiate the same upper and lower positions, the irradiation lights interfere with each other. Therefore, the arrangement of the reading devices 120a and 120b is separated from each other within the limit that the irradiation light from each light source of the reading devices 120a and 120b does not irradiate the same position up and down to prevent the above-mentioned interference.

The above-mentioned reading devices 120a and 120b have reading characteristics such as gamma value (density vs. sensor output value) affecting each piece of read information obtained by reading images on both sides of the document 9, and gradation characteristics. Here, we hope that the printed image quality of the image printed on both sides of the paper provided by the above-mentioned copier is the same. For this purpose, the information read from the upper side of the reading device 120a and the information read from the lower side of the reading device 120a are required. The information read by 120b is the same. Therefore, the above-mentioned copying machine has a configuration in which the reading correction device 132 is provided, and the reading characteristics of the above-mentioned reading devices 120a and 120b are corrected to make them the same.

For example, FIG. 29 shows the relationship between the output of the sensor device and the γ value of the amount of light reflected from the original 9 at the above-mentioned γ value (the total amount of light beams at a predetermined time), and it is generally γ>1, γ=1, or γ <1 curve. Here, when any light quantity value a sensor output increases, the reading correction device 132 corrects the γ value so that γ>1. Similarly, by performing correction to γ=1 or γ<1 by the reading correction device 132, the light intensity and the sensor output value are adjusted so that the reading information of the reading devices 120a and 120b on the upper and lower sides are the same.

In addition, among the reading devices 120a·120b on the upper and lower sides of the above-mentioned copying machine, the reading device 120a on the upper side may be fixed and the reading device 120b on the lower side may be moved, or it may be used, for example, in combination with existing reading devices. The reduction optical method (reduction CCD method) is the same as the moving method.

In the image reading operation at this time, the document 9 inserted in the document transport device 162 is first transported to the transport section 133 by the pickup roller 151 and the feed-in rollers 152a·152b. Therefore, while the original 9 is read by the above-mentioned fixed reading device 120a, the original 9 is sent into the horizontal transport path 133, but a reading table made of glass (not shown in the figure) is arranged on the lower side of the transport path 133. ), when the pulley 164 is stopped while the original document 9 is placed on the reading table, the above-mentioned fluorescent lamp (that is, the reading position Pb) as a light source moves. After that, the reading by the reading device 120b is completed, and the pulley 164 is further operated to convey the original 9 out.

In this way, by making the reading device 120b on the lower side a mobile type using a reduction optical method (reduction CCD method), it has the same configuration as that of a conventional copier that can place the original 9 from above on the above-mentioned glass original table. , it is also possible to handle and read originals such as books that cannot be fed by the original conveying device 162 .

Of course, the reading device 120b on the lower side of the reduction optical method (reduction CCD method) may not move as described above, and the fluorescent lamp is fixed at a predetermined position to deal with and read the original document 9 conveyed by the pulley 164.

What has been described above is the case where the image reading device using the light source of the present invention is applied to a copying machine, but it can also be applied to others, a facsimile machine and an image reading device, or a multifunction printer or the like.

Claims (19)

1. the light source of an image read-out, with transparent electrode layer, electroluminescent layer, the order of metal electrode layer forms rete on transparent substrate, undertaken luminously by the voltage that applies regulation on above-mentioned two electrode layers, the light source of described image read-out is characterised in that:

Along with the distance from the tie point of above-mentioned transparent electrode layer and lead-in wire increases, according to the resistance of the tie point of this transparent electrode layer certainly, the width of the above-mentioned electroluminescent layer of broadening makes the illumination on the original copy face even.

2. the light source of an image read-out, with transparent electrode layer, electroluminescent layer, the order of metal electrode layer forms rete on transparent substrate, undertaken luminously by the voltage that applies regulation on above-mentioned two electrode layers, the light source of described image read-out is characterised in that:

According to the resistance of the tie point of this transparent electrode layer certainly, the tie point of a plurality of above-mentioned transparent electrode layers and lead-in wire is set, on above-mentioned transparency electrode and this lead-in wire, form above-mentioned electroluminescent layer with certain thickness and width, make the illumination on the original copy face even.

3. the light source of an image read-out, with transparent electrode layer, electroluminescent layer, the order of metal electrode layer forms rete on transparent substrate, undertaken luminously by the voltage that applies regulation on above-mentioned two electrode layers, the light source of described image read-out is characterised in that:

On the periphery of above-mentioned transparent electrode layer, be arranged on the peripheral part that connects lead-in wire at least a portion of this periphery, on above-mentioned transparency electrode and this lead-in wire, form above-mentioned electroluminescent layer with certain thickness and width, make the illumination on the original copy face even.

4. the light source of the image read-out of putting down in writing according to claim 3 is characterized in that:

Insulate with dielectric film between above-mentioned electroluminescent layer and the lead-in wire.

5. the light source of an image read-out, with transparent electrode layer, electroluminescent layer, the order of metal electrode layer forms rete on transparent substrate, undertaken luminously by the voltage that applies regulation on above-mentioned two electrode layers, the light source of described image read-out is characterised in that:

The area of the electroluminescent body that R, the G, the B that send R (red), G (green), B (indigo plant) light that constitute above-mentioned electroluminescent layer is of all kinds as with the luminosity ability of electroluminescent body of all kinds and reading images are desired must the corresponding area of illumination, make the illumination on the original copy face even.

6. the light source of the image read-out of putting down in writing according to claim 5 is characterized in that:

Above-mentioned R, G, B electroluminescent body of all kinds are banded, and the width of the short direction of this R, G, B electroluminescent body is and above-mentioned luminous power and essential illumination corresponding width.

7. the light source of the image read-out of putting down in writing according to claim 5 is characterized in that:

On the length direction of above-mentioned transparent substrate, arrange a plurality of above-mentioned R, G, B electroluminescent body of all kinds.

8. the light source of an image read-out, with transparent electrode layer, electroluminescent layer, the order of metal electrode layer forms rete on transparent substrate, undertaken luminously by the voltage that applies regulation on above-mentioned two electrode layers, the light source of described image read-out is characterised in that:

The configuration of the electroluminescent body that R, the G, the B that send R (red), G (green), B (indigo plant) light that constitute above-mentioned electroluminescent layer is of all kinds makes the illumination on the original copy face even as with the luminosity ability of electroluminescent body of all kinds with reading images is desired must illumination dispose accordingly.

9. the light source of an image read-out forms luminescent layer on transparent substrate, and luminous from the surface and the inside of this luminescent layer by applying voltage, the light source of described image read-out is characterised in that:

The thickness that will form above-mentioned luminescent layer and its luminescent layer on than the short transparent substrate of the length of light source is being joined together on the length direction with as the even length of necessity of illumination that makes on the original copy face for a plurality of light source sheets of the same thickness of regulation.

10. the light source of the image read-out of putting down in writing according to claim 9 is characterized in that:

A plurality of light source sheets of the end width of the luminescent layer of above-mentioned each light source sheet being wider than central width are joined together on length direction, so that the illumination on the original copy face is even.

11. the light source of the image read-out of putting down in writing according to claim 9 is characterized in that:

The end face of the length direction of above-mentioned light source sheet is joined together on length direction with respect to tilt a plurality of light source sheets of angle of regulation of the short direction of above-mentioned light source, so that the illumination on the original copy face is even.

12. the light source of the image read-out of putting down in writing according to claim 9 is characterized in that:

The a plurality of light source sheets that the end thickness of the luminescent layer of above-mentioned each light source sheet are thinner than central thickness are joined together on length direction, so that the illumination on the original copy face is even.

13. the light source of the image read-out of putting down in writing according to claim 9 is characterized in that:

The luminescent layer of above-mentioned each light source sheet is joined together on length direction by a plurality of light source sheets that make the central luminous middle body luminescent layer of luminescent layer and the luminous end luminescent layer in luminescent layer end is constituted, so that the illumination on the original copy face is even.

14. the light source of the image read-out of putting down in writing according to claim 13 is characterized in that:

The thickness of above-mentioned end luminescent layer is thinner than above-mentioned middle body luminescent layer.

15. the light source of the image read-out of putting down in writing according to claim 13 is characterized in that comprising:

Emission control device is controlled the voltage that is applied on above-mentioned end luminescent layer and the above-mentioned middle body luminescent layer.

16. the light source of the image read-out of putting down in writing according to claim 9 is characterized in that:

Roughly become a plurality of light source sheets of L font on length direction, to be joined together the end face of the length direction of above-mentioned light source sheet, so that the illumination on the original copy face is even.

17. the light source of the image read-out of putting down in writing according to claim 16 is characterized in that:

Above-mentioned end face is eccentric to the middle body of the short direction of light source sheet.

18. the light source of the image read-out of putting down in writing according to claim 9 is characterized in that:

With above-mentioned luminescent layer is to be joined together on length direction by the light source sheet that the electroluminescent body constitutes, so that the illumination on the original copy face is even.

19. the light source of an image read-out is characterized in that:

The light source that the thickness of luminescent layer is got up to form for a plurality of light source chip bondings of the same thickness of regulation be configured in lens about, the bonding part of each light source sheet of configuration about formation on the diverse location of lens length direction is above-mentioned is so that the illumination on the original copy face is even.

Images