JPH0698085A - Image reader - Google Patents

Abstract

PURPOSE:To miniaturize an image reader and to remarkably reduce the lowering of picture quality affected on a photoelectric conversion element substrate by a LED. CONSTITUTION:In the image reader in which the optical axis of a rod lens array which forms an image of a picture on an original 11 on the photoelectrical conversion element substrate 19 as an unmagnified erected image is arranged in parallel with an original surface, a recessed part 20 is provided at the rear part of a first reflecting surface 15, and the light emitting surface of the LED 18 is arranged at the recessed part 20. Thereby, it is possible to remarkably reduce an adverse effect (increment of dark output) on the photoelectric conversion element substrate 19 due to the heating of the LED, and also, to prevent the picture quality from being lowered due to the leakage of light directly emitted from the LED 18 to the photoelectric conversion element substrate 19. In addition to that, no conventional light shielding member or no gap for original irradiation between the first reflecting surface and the lens array is required, which miniaturizes the reader.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image reading device.

[0002]

2. Description of the Related Art In recent years, various methods have been proposed for reducing the size of an image reading apparatus used for a facsimile or the like as an image reading apparatus unit along with the downsizing of the entire facsimile apparatus. FIG. 5 is a block diagram showing the outline of a conventional image reading apparatus, which is an image reading apparatus in which a rod lens array of a contact image sensor unit is arranged such that its optical axis is parallel to the document conveying direction.

In FIG. 5, reference numeral 1 is a document, and 2 is a platen roller for pressing and conveying the document 1. Reference numeral 3 denotes a main body housing of the image reading apparatus, which includes a reading glass plate 4, a first reflecting surface 5 arranged below the reading glass plate 4, and a second reflecting surface arranged opposite to the first reflecting surface 5. The original surface is illuminated through the reflecting surface 6, the rod lens array 7 arranged between the first and second reflecting surfaces 5 and 6 and having the optical axis parallel to the original surface, and the reading glass plate 4. LED8, second
The photoelectric conversion element substrate 9 provided with the photoelectric conversion element on which the light from the reflection surface 6 is incident, and the light shielding member 10 for cutting the light directly incident on the photoelectric conversion element substrate 9 apart from the regular optical path from the LED 8. Is stored.

Next, the operation of the image reading apparatus having the above conventional structure will be described. The original 1 set by the user of the apparatus is pressed and conveyed on the reading line by the platen roller 2. The image of the original document 1 conveyed on the reading line is illuminated by the LED 8 on the reading glass plate 4, and passes through the optical paths of the first reflecting surface 5, the rod lens array 7, and the second reflecting surface 6 to the photoelectric conversion element substrate 9. An image is read by forming an erect image of the same size. At this time, LE
The light directly incident from D8 is cut by the light blocking member 10.

[0005]

As described above, in the conventional image reading apparatus, the first problem is caused by the problem of adverse effect (increase in dark output) on the photoelectric conversion element substrate 9 due to the heat generation of the LED 8 and the document irradiation by the LED 8. In order to prevent the problem that a slight gap must be provided between the reflecting surface 5 of the LED and the rod lens array 7 and the deterioration of the image quality due to the light leakage from the LED 8 directly entering the photoelectric conversion element substrate 9, the light shielding member 1
There was a problem that 0 had to be set.

The present invention solves the above-mentioned problems and, while achieving miniaturization as compared with the prior art, the adverse effect on the photoelectric conversion element substrate due to the heat generation of the LED and the leakage of light directly entering the photoelectric conversion element substrate from the LED are prevented, and the image of the image is prevented. An object of the present invention is to provide an image reading device capable of reducing deterioration as much as possible.

[0007]

In order to achieve the above object, the present invention arranges a light emitting surface of an LED in a recess provided in a rear portion of a first reflecting surface, or disposes an LED and a photoelectric conversion element. First LED on the same flexible substrate
The structure is arranged on the flexible substrate bent at the rear portion of the first reflecting surface so that the original surface is irradiated with light from the rear surface of the reflecting surface.

[0008]

With the above structure, it is not necessary to provide a gap between the first reflecting surface and the rod lens array for irradiating the reading glass plate with light from the LED, and the LED directly enters the photoelectric conversion element. Since it is not necessary to provide a light shielding member for preventing light leakage, the size can be reduced more than before, and some adverse effects on the photoelectric conversion element can be eliminated.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An image reading apparatus according to an embodiment of the present invention will be described below with reference to the drawings. 1 and 2, in FIG.
Reference numeral 3 denotes a main body housing of the image reading device, which is a reading glass plate 1.
4, a first reflecting surface 15 arranged below the reading glass plate 14, a second reflecting surface 16 arranged so as to face the first reflecting surface 5, the first reflecting surface 15 and the first reflecting surface 15. A rod lens array 1 arranged between two reflecting surfaces 16 and having an optical axis parallel to the original conveying surface on the reading glass plate 14.
LED for illuminating the original surface through the reading glass plate 14
18, a photoelectric conversion element substrate 19 having a photoelectric conversion element on which light is incident from the second reflection surface 16 is housed. Two
Reference numeral 0 denotes a concave portion provided in the rear portion of the first reflecting surface 15, and the light emitting surface of the LED 18 that illuminates the original surface is arranged in the concave portion 20.

In FIG. 3, 11 is a main body housing 13.
Documents transported on the reading glass plate 14 of the document, 12 is a document 1
The image of the original 11 conveyed on the reading line is a platen roller that presses and conveys 1 on the reading line.
Is illuminated by. Next, the operation of the image reading apparatus of this embodiment will be described. Document 11 set by the device user
Is pressed and conveyed on the reading line by the platen roller 12. The image on the document 11 conveyed on the reading line is illuminated by the LED 18 arranged on the reading glass plate 14 in the recess 20 provided in the rear portion of the first reflecting surface 15, and the first reflecting surface 15 and the rod. Lens array 17, second
The image is read as an equal-magnification erect image on the photoelectric conversion element substrate 19 through the optical path of the reflecting surface 16. At this time, since the LED 18 irradiates from the rear surface of the first reflecting surface 15, it does not directly enter the photoelectric conversion element substrate 19, and therefore it is not necessary to cut the light by a light shielding member or the like, and the first Since it is not necessary to provide a gap for irradiating the original between the reflecting surface 15 and the rod lens array 17, the device can be downsized.

Next, another embodiment of the present invention will be described. In FIG. 4, 21 is a reading glass plate, 22 is a first reflecting surface, 23 is a second reflecting surface, and 24 is a rod lens array, which are the same as those in FIG. Reference numeral 25 denotes a flexible substrate, and the photoelectric conversion element 26 and the LED 27 are mounted on the flexible substrate 25.
The flexible substrate 25 is bent to the rear portion of the first reflecting surface 22 at the portion where the LED 27 is arranged so that 27 can illuminate the document 28 on the reading glass plate 21 from the rear surface of the first reflecting surface 22. . In this way, the photoelectric conversion element 26 and the LE mounted on the same flexible substrate 25
LED27 from the rear surface of the first reflecting surface 22 using D27
Since it is configured to irradiate the original surface, the above-mentioned problems can be overcome as in FIG.

[0012]

As described above, according to the present invention, the LED is arranged in the concave portion provided at the rear portion of the first reflecting surface,
A flexible substrate in which the ED and the photoelectric conversion element are formed on the same flexible substrate, and the LEDs are arranged at the rear of the first reflecting surface so that the LEDs are irradiated from the rear surface of the first reflecting surface to the original surface. Since it is arranged above, it is possible to minimize the adverse effect (increase in dark output) on the photoelectric conversion element substrate due to the heat generation of the LED, and it is possible to prevent the deterioration of the image quality due to the light leakage from the LED directly entering the photoelectric conversion element substrate. Moreover, it is not necessary to provide a light-shielding member as in the related art and it is not necessary to provide a gap for irradiating an original between the first reflecting surface and the rod lens array, so that the apparatus can be downsized.

[Brief description of drawings]

FIG. 1 is a sectional view showing a configuration of an image reading apparatus according to an embodiment of the present invention.

FIG. 2 is a perspective view in which a part of the image reading apparatus is cut away.

FIG. 3 is a cross-sectional view showing a usage state of the image reading apparatus.

FIG. 4 is a cross-sectional view showing a usage state of another image reading apparatus of the present invention.

FIG. 5 is a cross-sectional view showing the configuration of a conventional image reading device.

[Explanation of symbols]

 Reference numeral 11 original document 12 platen roller 13 main body housing 14 reading glass plate 15 first reflecting surface 16 second reflecting surface 17 rod lens array 18 LED 19 photoelectric conversion element substrate 20 recess 21 reading glass plate 22 first reflecting surface 23 second Reflective surface 24 Rod lens array 25 Flexible substrate 26 Photoelectric conversion element 27 LED 28 Original

Claims (2)

[Claims] 1. A reading glass plate, an LED for illuminating a document surface through the reading glass plate, a rod lens array having an optical axis arranged in parallel with the document surface, and arranged on an incident side and an emitting side of the rod lens array. An image reading apparatus comprising: a first reflective surface and a second reflective surface, and a photoelectric conversion element substrate on which light from the second reflective surface is incident,
An image reading apparatus, wherein a light emitting surface of the LED is arranged in a concave portion provided at a rear portion of the first reflecting surface. 2. The LED and the photoelectric conversion element are formed on the same flexible substrate, and the LED is bent at the rear portion of the first reflecting surface so that the LED is irradiated from the rear surface of the first reflecting surface to the original surface. The image reading device according to claim 1, wherein the image reading device is arranged on a flexible substrate.