JPH11134920A - Lighting system, and image reading device and information processing device using it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a bonding wire from forming a shadow that disturbs the directivity of the luminous flux emitted from a light source and stop the shadow from appearing along with the unevenness of the directivity. SOLUTION: This lighting system is equipped with a transparent member having a light incidence surface at its one end and a surface radiating incident luminous flux on one longitudinal surface different from this end, and a light source 1 formed so as to emit the incident luminous flux from the light incidence surface. In this case, the light source 1 has an emitting part and an electrode part that applies voltage to the emitting part to make it emit light and at least one part of the electrode part is an EL light source used as a transparent conductive layer; hence, the luminous flux that is produced at the emitting part and transmitted through the transparent conductive layer enters the light incidence surface. In addition, the light source 1 is an EL light source formed by laminating a transparent electrode layer and an emitting layer on a board 5 in the form of a thin film.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an illuminating device having a light guide made of a translucent member, an image reading device having the illuminating device for reading an image, and information using the illuminating device and the image reading device. It relates to a processing device.

[0002]

2. Description of the Related Art Conventionally, facsimile machines, electronic copiers,
Alternatively, as an illumination device of an image reading device of another information processing device, a discharge tube such as a fluorescent tube of a thin tube light source or an LED is used.
An LED array in which a large number of chips are arranged in a linear array is used. In particular, in recent years, facsimile apparatuses and the like have been increasingly used in homes, and there has been a demand for smaller and lower-priced products.

Further, in order to reduce costs by reducing the number of LED chips to be used, for example, Japanese Patent Laid-Open No. 6-2170
No. 84, the use of a lighting device combining a LED chip and a light guide made of a translucent member has also been used.

FIG. 10 shows such an image reading apparatus. In the drawing, each member has a structure that is long in the depth direction of the paper surface. In the drawing, reference numeral 91 denotes three RGB LED light emitting elements, 2 denotes a light guide for transmitting illumination light of the light emitting element 91,
Reference numeral 3 denotes an equal-magnification optical system for converging light reflected from the original, 4 denotes a light receiving element for reading the amount of reflected light from the equal-magnification optical system 3, and 6 denotes an original from which an image can be read.

In FIG. 10, the LED light emitting element 9
The light from 1 is irradiated on the original 6, and the reflected light from the original 6 is imaged on the light receiving element 4 through the 1 × optical system 3. FIG.
FIG. 10 shows the functions of the light guide 2 and the LED light emitting element 91 of FIG. In FIG. 11, reference numeral 2 denotes a light guide, and 12 denotes an LE of a light source.
The incident surface of the light from the D light emitting element 91, 13 is the area of the sawtooth reflection surface, 15 is the reflection surface in the reflection surface area 13, and 91 is an LED light emitting element which is a light source of three colors.
As shown in FIG. 11A, a part L of the light beam emitted from the light emitting source 91 enters the region 13 and is reflected by the reflection surface 15 of the region 13 to irradiate the irradiated surface of the original 6 with the document 6. .
Since the region 13 has a saw-tooth reflection surface, it does not substantially diffusely reflect. Therefore, the light incident on the reflecting surface is efficiently reflected on the irradiated surface side in the normal direction,
With such a configuration, a light beam having broad directivity emitted from the LED light emitting element 91 is converted into uniform linear illumination by the semicircular projection of the light guide 2.

The light source of the image reading apparatus for improving the color discrimination performance of a color original is such that an LED having a plurality of constant emission wavelength ranges is used as a light source, and a light beam from each LED element light source is emitted linearly. It is desired to do. As an example of an image reading apparatus provided with an illumination device using such an LED element as a light source, the one shown in FIG. 10 can be considered.

By the way, there are many types of LED light sources, and they cannot be described in general. However, in recent years, an LED chip called a surface mount type has been achieved which has been further downsized and is convenient for mounting. Are known. FIG. 12 shows this surface-mounted LED light source that is placed long in the depth direction on the paper. In FIG. 12, reference numeral 51 denotes an LED chip as a light emitting source; 52, a printed circuit board on which the LED chip 51 is mounted for electrical connection to the outside; 53, a reflective frame for preventing light emission to the outside; Translucent resins 55 and 56 that transmit the light flux are electrodes formed on the surface of the substrate 52. Such an LED light source has a size of the light source itself of 2 to 2.
The size is 3 mm or less and the height is 2 mm or less, and miniaturization is progressing. Further, since the electrodes 55 and 56 are drawn out to the rear surface via the side surfaces of the substrate 52, when mounting, simply overheat (reflow) through a reflow furnace on a mounting substrate on which cream solder is printed. And efficient mounting can be performed. Therefore, it is more desirable to use such an LED light source for use as a linear light source.

[0008]

However, in the conventional lighting device, the LED used as the light source has a structure in which a voltage for causing the element to emit light is applied through a bonding wire connected to an upper portion of the light emitting layer. Therefore, the luminous flux emitted from the light emitting layer is reflected by the bonding wire, and if three colors are required for the light source, the number of bonding wires increases accordingly, and the absolute amount of the luminous flux incident on the light guide incident end face decreases. . Also, the directivity of the luminous flux emitted from the LED element is disturbed due to the shadow of the bonding wire, and the way in which the luminous flux is obstructed differs between the part where the wire straddles the element in an arc and the other part does not. Appear with the non-uniformity of

As shown in FIG. 12, the directivity of light emission of such an LED chip is expected to be an isotropic directivity as shown by a solid line. It becomes a distorted thing as shown by.

[0010] Furthermore, the way of drawing the arc of the bonding wire is not always the same, and differs for each element.
The directivity as a light source also differs for each element, and this may give variation in the illuminance distribution.

[0011] In addition, in order to establish conduction using a bonding wire, a step of bonding one bonding wire for each LED chip is required, which has caused a cost increase.

[0012]

DISCLOSURE OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and does not use a bonding wire for an electrode for applying a voltage to a light source light emitting portion to emit light. This problem is solved by ensuring conduction through a transparent conductive film.
Further, in order to enable such a configuration, a light emitting layer laminated in a thin film shape is used as a light source instead of an LED.

A light-transmitting member having a light incident surface at an end and a surface for emitting a light beam incident on one surface in a longitudinal direction different from the end, and light incident from the light incident surface; In a lighting device including a light source provided to generate a light flux, the light source includes a light emitting unit and an electrode unit for applying voltage to the light emitting unit to cause the light emitting unit to emit light, and the electrode unit EL (ElectroLum) at least a part of which is a translucent conductive layer.
inescence: an electroluminescence effect light source, wherein a light flux generated in the light emitting portion and transmitted through the light transmitting conductive layer is incident on a light incident surface of the light transmitting member.

In the above-mentioned lighting device, the light source is:
An EL light source is formed by laminating a transparent electrode layer and a light emitting layer in a thin film shape on a substrate. Further, the light source is an organic EL device having an organic molecular layer as a light emitting layer. Further, the light source is a first light-transmitting substrate.
A light-transmitting conductive layer is formed thereon directly or through several thin film layers, and further directly thereon or through some thin film layers. EL with light emitting layer formed
It is a light source. The light source is provided on a first substrate.
A light-emitting layer is formed directly on the main surface or through several thin film layers, and further thereon a light-transmitting conductive layer is formed directly thereon or through some thin film layers Characterized in that it is an EL light source.

Further, a substrate having an electrode for supplying a voltage to be applied to the light emitting layer from the outside is provided on the first main surface of the light source substrate so as to cover at least a part of the light transmitting substrate. It is characterized by being. Further, a lead member for supplying a voltage applied to the organic layer from the outside is provided on the first main surface of the light source substrate, and both the lead and the light-transmitting substrate are integrally formed by a resin member covering these. Characterized in that it is fixed to

Further, in an information processing apparatus using a lighting device, a support portion for positioning and / or fixing the light guide is provided on a substrate having the electrodes covering the substrate. Further, the light source is an EL light source having a light-emitting portion and an electrode portion for applying voltage to the light-emitting portion to cause the light-emitting portion to emit light, at least a part of the electrode portion being a light-transmitting conductive layer, A luminous flux generated in the light emitting portion and transmitted through the light-transmitting conductive film is incident on a light incident surface of the light guide. The light source is an EL light source formed by laminating a transparent electrode layer and a light emitting layer in a thin film shape on a substrate. Further, a substrate having an electrode for supplying a voltage to be applied to the light emitting layer from the outside is provided on the first main surface of the light source substrate so as to cover at least a part of the light transmitting substrate. Features.

A light emitting source; a light guide for diffusing light from the light emitting source 1; an equal-magnification optical system for imaging reflected light from a document linearly irradiated from the light guide; In an image reading apparatus including a light receiving element for converting light transmitted through the equal-magnification optical system into an image signal, and a transparent substrate on which the light receiving element is mounted, the light emitting source is a light transmitting substrate; A photoconductive layer, a hole transport layer, a light emitting layer, an electron injection transport layer, and a cathode are sequentially laminated, and the light transmitting substrate is brought into contact with an end face of the light guide. Features. Further, in the image reading apparatus, the light guide has a region of a sawtooth reflection surface in a longitudinal direction by receiving light from the light transmitting substrate of the light emission source, and a region facing the region of the reflection surface. The reading member is irradiated from a semicircular reflected light emitting section to the reading member. Further, in an information processing apparatus using an image reading device, an image signal from the light receiving element is subjected to image signal processing and transmitted to a communication line.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION

[First Embodiment] FIG. 1 is a diagram showing a schematic configuration of a first embodiment of the present invention. In FIG. 1, reference numeral 1 denotes an EL element light emitting source, 2 denotes a light guide made of a translucent member for diffusing light from the EL element light emitting source 1, and 3 denotes an image of light reflected from a document on a light receiving element. 1x optical system for 4 and 1x optical system 3
A light receiving element for converting light passing through the light receiving element into an image signal, 5 is a printed circuit board on which the light receiving element 4 is mounted, and 6 is a document from which an image is read.

In FIG. 1, E which constitutes the optical unit
Light emitted from the L element light source 1 and guided and reflected in the longitudinal direction by the light guide 2 is emitted from the semicircular portion at the top of the light guide 2 to irradiate the original 6 in a line shape. Normally, the original 6 and the light guide 2 move relatively to irradiate in the sub-scanning direction to read an image. The reflected light from the original 6 is imaged by the equal-magnification optical system 3 on a line sensor 4 of a photoelectric conversion element in which a plurality of chips formed on a printed circuit board 5 are arranged in a line, and is converted into an image signal. .

Since the EL element light emitting source 1 can be formed by laminating a light-transmitting conductive layer and a light-emitting layer on the substrate 5 in a thin film form, conduction is ensured by the light-transmitting conductive layer without using a bonding wire. It is easy to do.

Next, the details of the EL element light emitting source 1 in this embodiment will be described. In general, the EL element light emitting source 1 includes an inorganic EL element using electroluminescence using an inorganic material and an organic EL element using current injection light emission using an organic material.

Although inorganic EL elements have been partially put to practical use in backlights of watches and the like, there is a problem that high-intensity blue light emission cannot be obtained and AC high voltage driving is required. An organic EL element capable of emitting various colors has attracted attention because it can be driven by a voltage and many organic compounds can be used as a luminescent center. Furthermore, organic EL
The element can have high luminance (10,000 cd / m ² or more) and high efficiency (10 lm / w or more). The EL element light source 1 used in the present embodiment is an organic EL using an organic EL.
L element. The use of the organic EL element enables driving at a low direct-current voltage, which is advantageous in terms of easiness of creation of a driving circuit and low noise.

The light emission principle of the organic EL device is called a charge injection type. By applying a DC voltage to the organic thin film, electrons and holes (holes) are respectively injected from the cathode and the anode, and the luminescence center is excited by their recombination. This reaction is chemically a reaction between a radical anion (electron injection) and a radical cation (hole injection). At the cathode-organic interface, electrons are given to organic molecules and reduced to radical anions. And oxidize to produce radical cations. The generation and recombination of carriers is a reaction between a radical anion and a radical cation,
The recombination produces a neutral ground state molecule and an excited state molecule. The exciton ideally emits light after free diffusion and returns to the ground state.

FIG. 2 is a sectional view of a typical organic EL device. In FIG. 2, 27 is a translucent substrate, 21 is a translucent conductive layer, 22 is a hole transport layer, 23 is a light emitting layer, 24 is an electron injection and transport layer, and 25 is a cathode. 2, a transparent conductive layer 21 made of ITO (Indium Tin Oxide) is formed on a transparent substrate 27, and a hole transport layer 22, a light emitting layer 23, an electron injection transport layer is formed on the transparent conductive layer 21. 24 and a cathode 25 are stacked.

The light-transmitting conductive layer 21 made of ITO
Is formed on the translucent substrate 27 by vacuum evaporation or sputtering. As the hole transport layer 22, for example, an aromatic diamine (TPD) is deposited. As the light emitting layer 23, for example, a tris (8-quinolinolato) aluminum complex (Alq) is formed by vacuum evaporation. For example, a 1,2,4-triazole derivative is deposited as the electron injection transport layer 24.

Alternatively, since Alq, which is the light emitting layer 23, also has a good electron transport layer, the Alq layer may serve as both the light emitting layer 23 and the electron transport layer. In addition, for the light emitting layer 23, and in some cases, the hole transport layer 22, the electron transport layer 24, and the like, an appropriate material can be selected according to a desired emission color. As the cathode 25, MgAg (for example, a weight ratio of 1
0: 1), MgIn or the like is deposited or sputtered.

In the structure shown in FIG. 2, a hole injection layer is provided between the light-transmissive conductive layer 21 as the anode and the hole transport layer 22 or an electron injection layer is provided between the cathode 25 and the electron transport layer 24. Even if a layer is provided, it has the same high emission characteristics, does not depend on the viewing angle, has a contrast of 100 or more, has a response speed of 1 μs or less, and has an excellent luminance half life of 5,000 hours or more. Has characteristics.

FIG. 3 shows a case where a polymer compound is used.
Shown in 3, reference numeral 27 denotes a light-transmitting substrate, 21 denotes a light-transmitting conductive layer, 28 denotes a hole transporting light-emitting layer, and 29 denotes a carrier block layer. As the hole transporting light emitting layer 28, for example, poly (N-vinyl carbazole) (PV
Use K). As the hole block layer 29, 1, 2,
Use 4-triazole. Further, by dispersing a fluorescent dye having an arbitrary emission color in the hole transporting light emitting layer 28, emission colors from blue to red can be obtained. Dip coating or spin coating is used for laminating the polymer compound.

By using the organic EL element as described above, a light source that can be driven at a low DC voltage can be achieved, and an image sensor that can be driven at a low DC voltage as a whole can be obtained.

Next, E according to the first embodiment of the present invention will be described.
The structure of the L element light emitting source 1 and the method of connecting the EL element light emitting source 1 and the light guide 2 will be described. FIG. 4 shows the light guide 2 and the EL element light source 1 in the image sensor of the present invention.
FIG. 3 is a schematic perspective view of FIG. In FIG. 4, 1 is an EL element light emitting source, 2 is a light guide, 21 is a translucent conductive layer, 25 is a cathode,
27 is a translucent substrate, 31 is a red light emitting layer, 32 is a green light emitting layer, 33 is a blue light emitting layer, 34 is a conductive adhesive, 35 is a flexible substrate, 36 is an electrode (external electrode) from the flexible substrate, 37 Is a protruding portion for fixing the flexible substrate 35, and 38 is an opening for passing the protruding portion 37.

In FIG. 4, a light-transmitting conductive layer 21 is formed on a light-transmitting substrate 27, and the light-transmitting conductive layer 21 as the transparent electrode is used as a common electrode, and red, green, blue, Organic light emitting layers (31, 32, 33) are laminated, and a cathode 25 is formed on each layer, and the cathode 25 and the translucent conductive layer 21 are attached to the electrode 36 from the flexible substrate 35 by the conductive adhesive 3
The EL element light emitting source 1 joined at 4 is formed.

The translucent substrate 27 of the above-mentioned organic EL element light emitting source 1 is arranged with the back surface opposite to the surface on which the organic layer is formed facing the light incident end surface of the light guide 2. .

In this embodiment, an air layer is interposed between the light transmitting substrate 27 and the light incident end face of the light guide 2.
This is generally advantageous for the uniformity of illumination by the light guide 2. However, needless to say, a structure may be employed in which the light-transmitting adhesive is used for bonding. In this case, it is possible to prevent loss due to light flux reflection at the interface between the translucent member and the air layer and the interface between the light guide light incident surface and the air layer, which is advantageous in terms of light quantity. The element light source 1 and the light guide 2 are positioned and joined by inserting the protrusion 37 provided on the light guide side into the opening 38 provided in the EL element light source 1.

FIG. 5 shows a cross-sectional view of the EL element light emitting source 1 of FIG. 4. FIG. 5A shows the EL element light emitting source 1 according to the first embodiment of the present invention in the x-axis direction in FIG. It is a typical sectional view. FIG. 5B is a schematic cross-sectional view of the EL element according to the first embodiment of the present invention in the y-axis direction in FIG.

In FIG. 5A, 21 is a light-transmitting conductive layer, 22 is a hole transport layer, 23 is a light emitting layer, 24 is an electron injection transport layer, 25 is a cathode, 34 is a conductive adhesive, and 36 is a conductive adhesive. Electrode from flexible board, 35 is flexible board, 3
Reference numeral 9 denotes an insulating and moisture-resistant adhesive. FIG.
In (b), 21 is a translucent conductive layer, 22 is a hole transport layer, 23 ′ is a red light emitting layer, 23 ″ is a green light emitting layer,
3 ″ ′ is a blue light emitting layer, 24 is an electron injection / transport layer, 25 is a cathode, 34 is a conductive adhesive, 36 is an electrode from a flexible substrate, 35 is a flexible substrate, and 39 is an insulating and moisture-resistant adhesive. 5A, a light-transmitting conductive layer 21 is formed on a light-transmitting substrate 27, and a hole-transporting layer 22, a light-emitting layer 23, and an electron-transporting layer are formed on the light-transmitting conductive layer 21. 24, a cathode 25 is laminated, and the cathode 25 has a structure having a portion slightly protruding from the lamination end surface in order to adhere to the external electrode 36 from the flexible substrate 35;
The overhanging portion 37 is bonded to the external electrode 36 via a conductive adhesive. The flexible substrate 35 and the cathode 2 other than the adhesive surface with the external electrode 36
5, the flexible substrate 35 and the translucent substrate 2
The adhesive 39 has an insulating property and a moisture resistance.
Glued by

Here, the light-transmitting conductive layer 21 is formed as shown in FIG.
As shown in (b), they are formed so as to become a common electrode, and a red light emitting layer 23 ′ and a green light emitting layer 2 are respectively formed thereon.
An EL element having the 3 ″ and blue light emitting layer 23 ″ ′ as the light emitting layer 23 in FIG. 5A is formed. When red is lit, the red reflected light of the document is read, when green is lit, the green reflected light of the document is read, and when blue is lit, the blue reflected light of the document is read, allowing color documents to be read become.

In this embodiment, an EL element capable of reading a color document is described as an embodiment. However, an EL element dedicated to monochrome reading may be used depending on the application. In that case, it is not necessary to provide a red light emitting layer, a green light emitting layer, and a blue light emitting layer, respectively, and only a single light emitting color light emitting layer may be provided.

Also, by making the conductive adhesive 34 and the insulating and moisture-resistant adhesive 39 have elasticity, they act as shock absorbers when the cathode 25 and the external electrode 36 and the flexible substrate 35 are bonded. Damage to the laminates 21 to 24 and the cathode 25 is reduced, the yield is improved, and a shock-absorbing effect is similarly obtained when the EL element light emitting source is connected to the light guide. In addition, since the EL element is sealed, oxidation of the electrode and deterioration of the organic layer can be prevented.

Further, by mixing the light-reflective resin with the insulating / moisture-resistant adhesive 39, the loss of light emission can be suppressed.

[Second Embodiment] FIG. 6 shows a second embodiment of the EL element structure according to the present invention.
This is an embodiment in which a lead frame is used instead of the flexible substrate in the element structure.

In FIG. 6, reference numeral 40 denotes a lead frame,
1 indicates a tie bar, and 42 indicates a reflective resin. The other parts are the same as those in FIG. FIG. 6 (a)
In the above, the lead frame 40 may be joined with the conductive adhesive 34, or the cathode 25 and the lead frame 40 may be pressed. Next, as shown in FIG.
And the lead frame 40 joined to the cathode 25 and the like are molded with a reflective resin. Thereafter, as shown in FIG. 6C, the tie bar 41 provided between the multiple leads after the molding is cut. As described above, since the EL elements 31 to 33 and the lead frame are molded on the translucent substrate 27, a medium E is applied as long as there is no impact enough to break the molding resin.
The L element is safe. Also, by selecting the molding material,
Moisture resistance can also be improved. Needless to say, if a large impact is not applied to the EL element during use or during assembly, no molding is necessary.

[Third Embodiment] FIG. 7 shows a third embodiment of the EL element structure according to the present invention. FIG.
, 43 is a lead frame, 44 is a tie bar, 4
5 is a package, 46 is a pin hole, 47 is a completed E
The opening for inserting the L element is shown. FIG.
7A, a tie bar 44 is provided on the lead frame 43 in order to suppress flapping of a portion serving as an electrode. As shown in FIG.
Package 4 having opening 38 for joining with light guide
5 is molded. Pins are fixed with pins in order to suppress flapping of the leads in the package 45 during molding. After molding, a pin hole 46 is formed at the place where the fixing pins are located. The cathode 47 and the lead frame 43 of the EL element having the red light emitting layer 31, the green light emitting layer 32, and the blue light emitting layer 33 formed on the light transmitting substrate 27 are electrically connected to the opening 47 formed in FIG. The adhesive is adhered via the conductive adhesive 34. Then, extra leads around the tie bar 44 and the package are cut.

In FIG. 7C, the life of the EL element can be extended by pouring an insulating or moisture-resistant resin or adhesive between the EL element portion and the package opening. Of course, the present invention is effective not only for organic EL devices but also for inorganic EL devices.

[Fourth Embodiment] Next, an example in which the lighting apparatus of the present invention is applied to an information processing apparatus will be described with reference to the drawings. FIG. 8 shows an example of an information processing device (for example, a facsimile) configured using the lighting device according to the present invention. Here, reference numeral 61 denotes a feeding roller for feeding the document toward the reading position, and reference numeral 62 denotes a separating piece for reliably separating and feeding the document one by one. A platen roller 63 is provided at the reading position of the photoelectric conversion device 60 as a sensor unit and regulates the surface to be read of the document PP and conveys the document. P is a recording medium in the form of a roll paper in the illustrated example, and forms image information read by the photoelectric conversion device 60 or image information transmitted from the outside in the case of a facsimile device or the like.

Reference numeral 64 denotes a recording head for forming the image, and various types such as a thermal head, an ink jet head, and a bubble jet recording head can be used. The recording head 64 may be a serial type or a line type. Also,
A platen roller 65 conveys a recording medium to a recording position of the recording head 64 and regulates a recording surface thereof. Reference numeral 66 denotes an operation panel provided with a display unit and the like for receiving an operation input. Reference numeral 67 denotes a system control board, which includes a control unit for controlling each unit, a drive circuit for the photoelectric conversion element 60, a processing unit for image information, a transmission / reception unit with a telephone line, and the like.
Reference numeral 68 denotes a power supply of the apparatus.

This apparatus is entirely controlled by a microcomputer on a system control circuit board 67. Further, the microcomputer is controlled by the above-described lighting device, that is, housed in the photoelectric conversion device 60. EL
The lighting control of the light emitting element 1 and the driving control of the light receiving element 4 are performed. The image signal read by the photoelectric conversion device 60 is
Processing for recording on the recording medium P or image processing for outputting to the outside is performed by the system control circuit board 6.
7 is performed by the signal processing circuit.

FIG. 9 shows an example of a block diagram of an information processing apparatus constituted by using the photoelectric conversion device 60 described in each of the above embodiments, in which an image reading device 70 incorporating the photoelectric conversion device 60 is connected to a personal computer 80. This is a configuration example in which the image information is read out and sent to a computer or a network.

In FIG. 9, reference numeral 71 denotes an image reading device 7;
CPU as first control means for controlling the entirety of 0, 7
Reference numeral 2 denotes a color image sensor serving as a reading unit for converting an image of a document into an image signal, which includes a light source of the EL element light emitting source and a CCD line sensor, and 73 denotes an analog image signal read and output from the color image sensor 72. Is an analog signal processing circuit that performs analog processing such as gain adjustment on the analog signal. An A / D converter 74 converts the output of the analog signal processing circuit 73 into a digital signal.
An image processing circuit that performs image processing such as shading correction processing, gamma conversion processing, and scaling processing on output data of the converter 74, and an interface 77 that externally outputs digital image data subjected to image processing by the image processing circuit 75. . The interface 77 is, for example, an interface conforming to a standard adopted by a personal computer such as SCSI or Bi-Centronics, and is connected to the personal computer 80. The analog signal processing circuit 73, the A / D converter 74, the image processing circuit 75, and the memory 76 constitute signal processing means. The personal computer 80, which is the second control means, is provided with a magneto-optical disk drive, a floppy disk drive, and the like as the external storage device or the auxiliary storage device 81. Reference numeral 82 denotes a display for displaying operations on the personal computer 80, and reference numeral 83 denotes a mouse / keyboard for inputting commands and the like to the personal computer 80. Also, 8
4 is a personal computer 80 and an image reading device 70
This is an interface for exchanging data, commands, and status information of the image reading apparatus with the printer. The personal computer 80 can input a reading instruction to the image reading device by using a mouse / keyboard 83.

In this information processing apparatus, when a read instruction is input by the mouse / keyboard 83, the CPU 85 transmits a read command to the image reading apparatus via the interface 84. Then, the personal computer 80 controls the image reading device according to the control program information stored in the ROM 86. The control program may be executed by the CPU 85 by reading a program stored in a storage medium such as a magneto-optical disk or a floppy disk loaded in the auxiliary storage device 81 into the personal computer 80. As described above, by using the above-described lighting device in the present device, it becomes highly practical and valuable.

[0050]

As described above in detail, according to the present invention, a light-transmitting conductive layer is used in place of a conventional bonding wire for an electrode for applying a voltage to a light-emitting portion of a light source to emit light. The illuminance due to the non-uniformity of the directivity due to the reduction of the absolute amount of the luminous flux due to the reflection of the bonding wire by the configuration in which the luminous flux transmitted through the translucent conductive layer is incident on the light incident surface of the light guide An illumination device with less variation in distribution can be obtained.

Further, an increase in cost due to the bonding step can be suppressed, and a cost reduction effect can be expected. Further, according to the present invention, by using an EL element light emitting source in which a thin film light emitting layer is laminated on a substrate as a light source, it becomes easy to use a translucent conductive layer as an electrode instead of a bonding wire. . Further, according to the present invention, by using an organic EL element having an organic molecular layer as a light emitting layer as a light emitting source of the EL element, direct current low voltage driving becomes possible and driving becomes easy. Further, according to the present invention, high reliability can be obtained by covering the light emitting layer with a substrate having an electrode for supplying a voltage from the outside.

In addition, in the EL device of the present invention, a lead member for supplying a voltage to be applied to the organic layer from the outside is provided, and both the lead and the light-transmitting substrate are integrally fixed by a resin member covering them. Therefore, an EL element having excellent durability can be obtained.

By applying the lighting device of the present invention to an information processing device, a highly practical and valuable device can be provided. It is needless to say that the present invention can be appropriately modified within the scope of the present invention.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view for explaining a first embodiment of the present invention.

FIG. 2 is a schematic sectional view of the EL device according to the first embodiment of the present invention.

FIG. 3 is a schematic cross-sectional view when a polymer compound of an EL device according to the first embodiment of the present invention is used.

FIG. 4 is a view for explaining connection between the EL element and the light guide shown in FIG. 1;

FIG. 5 is an external sectional view of an EL element structure according to a first embodiment of the present invention.

FIG. 6 is a manufacturing process diagram of a second embodiment of the EL element structure according to the present invention.

FIG. 7 is a manufacturing process diagram of a third embodiment of the EL element structure according to the present invention.

FIG. 8 is an example in which the lighting device according to the present invention is applied to an information processing device.

FIG. 9 is a configuration example of an information processing apparatus to which the lighting device according to the present invention is applied.

FIG. 10 is a diagram illustrating a conventional image reading apparatus.

FIG. 11 is a diagram showing functions of the light guide and the LED in FIG. 10;

FIG. 12 is a diagram showing a light emitting state of a surface mount type LED light source.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 light emitting source 2 light guide 4 light receiving element 5 substrate 6 original document 11 light transmitting member 12 incident surface 13 area 14 reflecting surface 15 reflecting surface of area 5 21 light transmitting conductive layer 22 hole transport layer 23 light emitting layer 23 ′ Red light emitting layer 23 "Green light emitting layer 23" 'Blue light emitting layer 24 Electron injecting and transporting layer 25 Cathode 27 Translucent substrate 28 Hole transporting light emitting layer 29 Hole blocking layer 31 Red light emitting layer 32 Green light emitting layer 33 Blue light emitting layer 34 Conductivity Adhesive 35 Flexible substrate 36 External electrode 37 Projection 38 Opening 39 Insulating / moisture resistant adhesive 40 Lead frame 41 Tie bar 42 Reflective resin 43 Lead frame 44 Tie bar 45 Package 46 Pin hole 47 Opening 51 LED chip 52 Substrate 53 Reflection frame 54 Translucent resin 55 Electrode 56 Electrode 60 Photoelectric conversion device 61 Feeding roller Roller 62 Separation piece 63 Platen roller 64 Recording head 65 Platen roller 66 Operation panel 67 System control board 68 Power supply 70 Image reading device 71 CPU 72 Color image sensor 73 Analog signal processing circuit 74 A / D converter 75 Image processing circuit 76 Memory 77 Interface 80 Personal Computer 81 Auxiliary Storage Device 82 Display 83 Mouse / Keyboard 84 Interface 86 ROM 87 RAM 91 LED Light Source

Claims (19)

[Claims] 1. A light-transmitting member having a light incident surface at an end, and having a surface for emitting a light beam incident on one surface in a longitudinal direction different from the end, and light incident from the light incident surface. A lighting device including a light source provided to generate a light beam, wherein the light source has a light emitting unit and an electrode unit for applying voltage to the light emitting unit to cause the light emitting unit to emit light, and the electrode unit Is an EL light source in which at least a part of the light-transmitting conductive layer is a light-transmitting conductive layer, and a light beam generated in the light-emitting portion and transmitted through the light-transmitting conductive layer is incident on a light incident surface of the light-transmitting member. Lighting equipment. 2. The lighting device according to claim 1, wherein the light source is an EL light source formed by laminating a transparent electrode layer and a light emitting layer in a thin film shape on a substrate. 3. The lighting device according to claim 2, wherein the light source is an organic EL element having an organic molecular layer as a light emitting layer. 4. The light source comprises a light-transmitting conductive layer formed directly on the first main surface of the light-transmitting substrate or through some thin film layers, and further directly on the light-transmitting substrate. 3. The lighting device according to claim 2, wherein the light source is an EL light source having a light emitting layer formed thereon or through a plurality of thin film layers. 5. The light source according to claim 1, wherein the light source forms a light emitting layer directly on the first main surface of the substrate or through some thin film layers, and further directly on the light emitting layer or on some of the thin film layers. 3. The lighting device according to claim 2, wherein the light source is an EL light source having a light-transmitting conductive layer formed thereon via a thin film layer. 6. A substrate having an electrode for supplying a voltage to be applied to a light emitting layer from outside is provided on a first main surface of the light source substrate so as to cover at least a part of the light transmitting substrate. The lighting device according to claim 4, wherein the lighting device is provided. 7. A lead member for supplying a voltage to be applied to an organic layer from the outside is provided on a first main surface of the light source substrate, and the lead and the light-transmitting substrate both cover the resin. The lighting device according to claim 4, wherein the lighting device is integrally fixed by a member. 8. The lighting device according to claim 7, further comprising a supporting portion for positioning and / or fixing the translucent member to the substrate having the electrode covering the substrate. 9. An EL light source comprising: a light emitting portion; and an electrode portion for applying a voltage to the light emitting portion to cause the light emitting portion to emit light, at least a part of the electrode portion being a translucent conductive layer. The information processing apparatus according to claim 1, wherein a light beam generated in the light emitting unit and transmitted through the light-transmitting conductive film is incident on a light incident surface of the light guide. . 10. The information processing apparatus according to claim 1, wherein the light source is an EL light source formed by laminating a transparent electrode layer and a light emitting layer on a substrate in a thin film shape. . 11. The information processing apparatus according to claim 2, wherein the light source is an organic EL element having an organic molecular layer as a light emitting layer. 12. The light source comprises a light-transmitting conductive layer formed directly on the first main surface of the light-transmitting substrate or through some thin film layers, and further directly on the light-transmitting substrate. 3. An information processing apparatus using an illumination device according to claim 2, wherein the light source is an EL light source having a light emitting layer formed thereon or through a plurality of thin film layers. 13. The light source may form a light emitting layer directly on the first main surface of the substrate or through some thin film layers, and may further directly form a light emitting layer on the first main surface of the substrate. The information processing apparatus using an illuminating device according to claim 2, wherein the light source is an EL light source having a light-transmitting conductive layer formed thereon via a thin film layer. 14. A substrate having an electrode for supplying a voltage to be applied to the light emitting layer from outside is provided on a first main surface of the light source substrate so as to cover at least a part of the light transmitting substrate. An information processing apparatus using the lighting device according to claim 4. 15. A lead member for supplying a voltage to be applied to an organic layer from the outside is provided on a first main surface of the light source substrate, and the lead and the light-transmitting substrate both cover the resin. The information processing apparatus using the lighting device according to claim 4, wherein the information processing device is integrally fixed by a member. 16. The lighting device according to claim 7, wherein the substrate having the electrode covering the substrate has a support for positioning and / or fixing the light guide. Information processing device. 17. A light-emitting source, a light guide for diffusing light from the light-emitting source 1, and an equal-magnification optical system for imaging reflected light from a document linearly irradiated from the light guide. An image reading apparatus comprising: a light receiving element for converting light having passed through the equal-magnification optical system into an image signal; and a transparent substrate on which the light receiving element is mounted, wherein the light emitting source is a light transmitting substrate; A photoconductive layer, a hole transport layer, a light emitting layer, an electron injection transport layer, and a cathode are sequentially laminated, and the light transmitting substrate is brought into contact with an end face of the light guide. Characteristic image reading device. 18. The image reading apparatus according to claim 17, wherein the light guide has a sawtooth-shaped reflection surface region in a longitudinal direction by receiving light from a light-transmitting substrate of the light emitting source. An image reading apparatus, wherein an area facing the area of the reflection surface is irradiated to a member to be read from a semicircular reflected light emitting section. 19. An information processing apparatus using the image reading device according to claim 17, wherein an image signal from the light receiving element is subjected to image signal processing and transmitted to a communication line. apparatus.