Exposing apparatus and image forming apparatus using organic electroluminescence element
First Claim
Patent Images
1. A light source comprising:
- a light emitting unit including a light emitting layer for electrically emitting a light; and
a waveguide for emitting a light irradiated from the light emitting unit into air through a light take-out surface formed on an end face, wherein an area of the light take-out surface of the waveguide is set to be smaller than that of the light emitting layer.
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Abstract
A light source includes a light emitting unit including a light emitting layer for electrically emitting a light, and a waveguide for emitting a light irradiated from the light emitting unit into air through a light take-out surface formed on an end face, wherein an area of the light take-out surface of the waveguide is set to be smaller than that of the light emitting layer. Thus, the light irradiated from the light emitting layer is emitted through the light take-out surface of the waveguide. Therefore, it is possible to freely determine the size of the light source by the size of the light take-out surface of the waveguide. Consequently, it is possible to easily obtain a very small light source.
91 Citations
82 Claims
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1. A light source comprising:
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a light emitting unit including a light emitting layer for electrically emitting a light; and
a waveguide for emitting a light irradiated from the light emitting unit into air through a light take-out surface formed on an end face, wherein an area of the light take-out surface of the waveguide is set to be smaller than that of the light emitting layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A light source comprising:
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a light emitting unit including a light emitting layer for electrically emitting a light; and
a waveguide for receiving a light irradiated from the light emitting unit onto a light incidence plane and emitting the light into air from a light emitting plane formed on a surface other than the light incidence plane, wherein the waveguide has an area of the light emitting plane which is smaller than that of the light incidence plane, and has a size decreased gradually from the light incidence plane toward the light emitting plane. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
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35. An exposing apparatus comprising:
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an organic electroluminescence element including an anode for injecting holes, a luminescent layer having a luminescent region and a cathode for injecting electrons, the organic electroluminescence element being formed on a board as a light source; and
a waveguide an end face in a sub scanning direction of which is made to constitute a light taking out face and light irradiated from the luminescent layer and incident on the wave guide and emitted from the light taking out face is used as exposure light. - View Dependent Claims (36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50)
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51. An exposing apparatus comprising:
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an organic electroluminescence element including;
an anode electrode for injecting holes;
a cathode electrode for injecting electrons; and
a luminescent layer formed between the anode and the cathode and having a luminescent region and a thickness of the luminescent layer is made to be thickened than a thickness of the electrode, the organic electroluminescence element being formed on a board as a light source; and
a waveguide an end face in a sub scanning direction of which is made to constitute a light taking out face wherein light irradiated from the organic electroluminescence element and incident on the waveguide and emitted from the light taking out face is used as exposure light.
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52. An exposing apparatus comprising:
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an organic electroluminescence element including;
an anode electrode for injecting holes;
a cathode electrode for injecting electrons; and
a luminescent layer on a side proximate to the anode having a luminescent region and disposed on the side of the anode and a luminescent layer on a side proximate to the cathode having a luminescent region disposed on the side of the cathode, which are respectively formed between the anode and the cathode, and charge generating layers formed between the luminescent layer on the side proximate to the anode and the luminescent layer on the side proximate to the cathode, for injecting electrons to the luminescent layer on the side proximate to the anode and injecting holes to the luminescent layer on the side proximate to the cathode, the organic electroluminescence element being formed on a board as a light source; and
a waveguide an end face in a sub scanning direction of which is made to constitute a light taking out face wherein light irradiated from the organic electroluminescence element and incident on the waveguide and emitted from the light taking out face is used as exposure light. - View Dependent Claims (53, 54)
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55. The exposing apparatus as described in claim 52, wherein a potential difference between an electron affinity of the luminescent layer on the side proximate to the anode and the charge generating layer and a potential difference between an ionization potential of the luminescent layer on the side proximate to the cathode and the charge generating layer is set to be equal to or smaller than 0.6 eV.
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56. The exposing apparatus as described claim 52, wherein the charge generating layers comprises:
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a first charge generating layer disposed on a side of the luminescent layer on the side proximate to the anode; and
a second charge generating layer disposed on a side of the luminescent layer on the side proximate to the cathode, wherein the first charge generating layer is set with an electron affinity lower than an electron affinity of the second charge generating layer, and the second charge generating layer is set to an ionization potential higher than the first charge generating layer.
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57. The exposing apparatus as described in claim 56, wherein an initially formed charge generating layer is formed by resistance heating.
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58. The exposing apparatus as described claim 52, wherein the charge generating layer comprises a dielectric substance and a specific inductive capacity of the charge generating layer is equal to or larger than specific inductive capacities of the luminescent layer on the side proximate to the anode and the luminescent layer on the side proximate to the cathode.
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59. The exposing apparatus as described in claim 52, wherein the luminescent layer on the side proximate to the anode and the luminescent layer on the side proximate to the cathode are formed by members the same as each other.
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60. An exposing apparatus comprising:
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an organic electroluminescence element including;
a plurality of anode electrodes for injecting holes;
a plurality of cathode electrodes arranged alternately with the anode electrodes for injecting electrons; and
a plurality of luminescent layers, each having a luminescent region defined between the anode electrode and the cathode electrode; and
a wave guide an end face in a sub scanning direction of which is made to constitute a light taking out face, wherein light irradiated from the organic electroluminescence element and incident on the wave guide and emitted from the light taking out face is used as exposure light.
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61. The exposing apparatus as described in claim 60, wherein the luminescent layers are constituted by members the same as each other.
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62. The exposing apparatus as described in claim 60, wherein a layer including the luminescent layer disposed between an initially formed electrode and a successively formed electrode comprises a polymer.
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63. An exposing apparatus comprising:
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an organic electroluminescence element including;
an anode electrode for injecting holes;
a cathode electrode for injecting electrons; and
a luminescent layer formed between the anode and the cathode and having a luminescent region, the organic electroluminescence element being formed on a board as a light source; and
a waveguide an end face in a sub scanning direction of which is made to constitute a light taking out face wherein light irradiated from the organic electroluminescence element and incident on the waveguide and emitted from the light taking out face is used as exposure light, and the luminescent layer is formed by a material capable of forming the luminescent layer at least by coating.
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64. An exposing apparatus comprising:
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an organic electroluminescence element including;
an anode electrode for injecting holes;
a cathode electrode for injecting electrons; and
a luminescent layer formed between the anode and the cathode and having a luminescent region, the organic electroluminescence element being formed on a board as a light source; and
a waveguide an end face in a sub scanning direction of which is made to constitute a light taking out face wherein light irradiated from the organic electroluminescence element and incident on the waveguide and emitted from the light taking out face is used as exposure light, and a stepped difference formed by the board and the electrode formed above the board is made to be equal to or smaller than a thickness of the luminescent layer.
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65. The exposing apparatus as described in claim 64 wherein a layer including the luminescent layer comprises a polymer.
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66. The exposing apparatus as described in claim 51, wherein the waveguide is integrated with the board.
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67. The exposing apparatus as described claims 51, wherein a plurality of pieces of the waveguides optically isolated in a main scanning direction for respective pixels are aligned in parallel with each other.
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68. The exposing apparatus as described in claim 51, wherein the waveguide includes a core having a predetermined refractive index and a clad formed at an outer periphery of the core and having a reflective index smaller than the refractive index of the core.
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69. The exposing apparatus as described in claim 68 wherein the core is provided with a refractive index smaller than a refractive index of the luminescent layer.
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70. The exposing apparatus as described in claim 68, wherein the refractive index of the core is larger than a value constituted by subtracting 0.3 from the refractive index of the luminescent layer.
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71. The exposing apparatus as described in claim 51, further comprising a light shielding layer or a reflecting layer between the waveguides contiguous to each other.
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72. The exposing apparatus as described in claim 51, wherein the light taking out face is constituted by a shape in correspondence with a shape of the pixel.
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73. The exposing apparatus as described in claim 51, wherein the wave guide is formed with an angle converting portion for guiding light incident on the wave guide from the luminescent layer to the light taking out face by converting an angle of the light.
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74. The exposing apparatus as described in claim 73 wherein the angle converting portion guides light in a direction other than the sub scanning direction to the light taking out face.
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75. The exposing apparatus as described in claim 73, wherein the angle converting portion converts the angle to a direction orthogonal to either of main scanning and sub scanning to guide the light to the light taking out face.
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76. The exposing apparatus as described claim 73, wherein the angle converting portion is formed at an interface between the core and the clad disposed on a side opposed to the luminescent layer.
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77. The exposing apparatus as described in claim 51, wherein the reflecting layer is formed at least at any face of a face of the wave guide opposed to the light taking out face and a face of the wave guide disposed on a side opposed to the light emitting layer.
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78. The exposing apparatus as described claim 51, wherein the light taking out face is formed with diffusion restraining means for restraining diffusion of light emitted from the light taking out face.
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79. The exposing apparatus as described in claim 51, wherein light emitted from the light taking out face is focused on a photosensitive member in an erected image at equal magnification.
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80. The exposing apparatus as described in claim 51, wherein the organic electroluminescence element is driven by an alternating current, an alternating current voltage or a pulse wave.
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81. The exposing apparatus as described in claim 51, wherein the organic electroluminescence element is applied with a negative voltage between the anode and the cathode when light is not emitted.
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82. An image forming apparatus including the exposing apparatus described in claim 51 and a photosensitive member formed with an electrostatic latent image by the exposing apparatus and the electrostatic latent image is property formed on the photosensitive member.
Specification