JPH0686013A - Unit for reading picture - Google Patents

Abstract

PURPOSE:To miniaturize an unit for reading and also to reduce the attaching man-hour of reflection mirrors by arranging at least one of the plural reflection mirrors housed in the unit for reading so as to reflect light reflected at an original or the like for plural times in different directions. CONSTITUTION:The reflection mirror 50 within the reflection mirrors 44, 46, 48, 50 and 52 housed inside the main body 42 of the unit for reading is attached in a size and an angle capable of reflecting the light reflected by the reflection mirror 48 towards the reflection mirror 52 and reflecting the light reflected by the reflection mirror 52 towards an image forming lens 26. In such a manner, since the above-mentioned light is reflected for two times in the different directions by the reflection mirror 50, the number of the reflection mirrors can be reduced compared with the unit for reading of a conventional copying machine for attaching the reflection mirrors by the number of times of reflection. Thus, the unit for reading can be miniaturized and the attaching man-hour of the reflection mirrors can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image reading unit, and more particularly to an image reading unit in which a plurality of reflecting mirrors, solid-state image pickup devices and the like are housed in the reading unit.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 3, an image reading unit of this type has a light source 12, 12, in a reading unit body (case) 10 formed of a light shielding member.
The reflecting mirrors 14, 16, 18, 20, 22, 24, the imaging lens 26, and the solid-state image sensor (CCD) 28 are housed and configured.

This reading unit uses the light source 1 when reading the original 32 placed on the platen glass 30.
While irradiating light from 2 and 12 toward the original 32, the original 30 is scanned by moving in the direction of arrow A along the guide shaft 34, and the scanned light is reflected by the reflection mirrors 14 to 24 a plurality of times to be combined. The light is condensed by the image lens 26, and the condensed light beam 36 is imaged on the solid-state image sensor 26.

[0004]

However, since the conventional image reading unit is provided with the reflection mirrors 14 to 24 as many times as the number of times that the light scanned by the original 32 is reflected, the size of the reflection mirror becomes large and the reflection mirror is large. However, there is a drawback that the number of mounting steps increases. The present invention has been made in view of such circumstances, and an object thereof is to provide an image reading unit that can be downsized and can reduce the number of reflection mirror mounting steps.

[0005]

In order to achieve the above-mentioned object, the present invention provides a light source for irradiating a document placed on a platen glass with light and a plurality of light sources for reflecting the light reflected by the document a plurality of times. A reflecting mirror, an image forming lens for forming an image of the light reflected by the reflecting mirror arranged at the last stage of the plurality of reflecting mirrors, and an image pickup section arranged in the image forming section of the image forming lens. In the image reading unit,
At least one reflection mirror among the plurality of reflection mirrors of the reading unit reflects light reflected by the document or the like a plurality of times in different directions and guides the light to the imaging lens.

[0006]

According to the present invention, of the plurality of reflection mirrors housed in the reading unit, at least one reflection mirror reflects the light reflected by the original or the like a plurality of times in different directions and guides it to the imaging lens. I did it. As a result, the number of reflecting mirrors can be reduced as compared with the conventional image reading unit in which the reflecting mirrors are provided only for the number of times of reflecting light, so that the size can be reduced.
Further, the number of man-hours for mounting the reflection mirror can be reduced.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of an image reading unit according to the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 shows a first embodiment in which an image reading unit 40 according to the present invention is applied to a copying machine, and the same or similar members as those in the conventional example shown in FIG. And explain.

The reading unit 40 shown in FIG. 1 has a reading unit main body 42 formed of a light shielding member.
A pair of illumination lamps 12, 12, reflecting mirrors 44, 46,
The components 48, 50, 52, the imaging lens 26, the solid-state image sensor 28, and the like are housed. The reading unit 40 includes a document 32 placed on the platen glass 30.
When copying, the light from the illumination lamps 12 and 12 is applied to the original 3
The original 32 is scanned while moving in the direction of arrow A along the guide shaft 34 while irradiating toward the document 2. Then, the scanned light is reflected six times in the order of the reflection mirror 44, the reflection mirror 46, the reflection mirror 48, the reflection mirror 50, the reflection mirror 52, and the reflection mirror 50, so that the optical path length is extended by the imaging lens 26. The light flux 36 is condensed and imaged on the solid-state image sensor 28.

The image forming lens 26 is held by the lens barrel 54 and can move along the optical axis in the directions of arrows B and C along with the lens barrel 54 according to the copy magnification. In addition, the solid-state image sensor 28 includes a driver substrate 56 for the solid-state image sensor 28.
Are connected. On the other hand, the reflection mirror 50 has a size that allows the light reflected by the reflection mirror 48 to be reflected toward the reflection mirror 52 and reflects the light reflected by the reflection mirror 52 toward the imaging lens 26. , And is attached at a reflective angle.

According to the reading unit 40 thus constructed, one of the reflecting mirrors 44 to 52 is provided with the light reflected by the reflecting mirror 48 and the reflecting mirror 52 side. Since the light reflected by 52 is attached to the imaging lens 26 side so as to be reflected twice, the number of reflection mirrors is reduced as compared with the conventional image reading unit in which the reflection mirror is attached for the number of times of reflection. it can.

Therefore, according to the present embodiment, the size can be reduced as compared with the conventional reading unit, and the number of man-hours for mounting the reflecting mirror can be reduced. In addition, in the first embodiment, one reflection mirror 50 is attached so as to reflect twice in different directions. However, the present invention is not limited to this, and a plurality of reflection mirrors may be used for multiple reflections. good. As a result, the reading unit 40 can be further downsized, and the number of steps for mounting the reflection mirror can be further reduced.

FIG. 2 shows a second embodiment of the image reading unit 58 according to the present invention. The same or similar members as those in the first embodiment shown in FIG. 1 are designated by the same reference numerals. The description is omitted. In the reading unit body 42 shown in FIG. 2, reflection mirrors 60, 62, 64, 6 are provided.
6 are stored in the reflection mirrors 60 to 66, and the reflection mirrors 60 to 66 reflect the light reflected from the original 32 to the reflection mirror 60 → reflection mirror 62 → reflection mirror 64 → reflection mirror 66 → reflection mirror 6
It is arranged such that the light is reflected six times in the order of 4 → reflection mirror 62 and is condensed by the imaging lens 26. That is, the two reflection mirrors 62 and 64 are attached with a size capable of reflecting the light twice in different directions and at an angle capable of reflecting the light twice.

According to the reading unit 58 thus constructed, the two reflecting mirrors 62 and 64 of the reflecting mirrors 60 to 66 are attached so as to reflect twice in different directions. The number of reflecting mirrors can be significantly reduced compared to the conventional image reading unit in which the reflecting mirrors are mounted by the amount. Therefore,
According to the present embodiment, the size can be reduced as compared with the conventional reading unit, and the number of mounting steps of the reflection mirror can be reduced.

Further, as compared with the first embodiment (see FIG. 1) in which one reflection mirror 50 reflects twice, the number of reflection mirrors can be reduced by one, so that the other purpose space 68 is provided in the reading unit 42. Can be formed. In the second embodiment, the two reflecting mirrors 62 and 64 are moved in different directions.
Although it is mounted so as to be reflected once, it is not limited to this, and it may be reflected plural times by three or more reflection mirrors. This makes it possible to further reduce the size of the reading unit and further reduce the number of reflection mirror mounting steps.

Further, in the present embodiment, the case where the present invention is applied to a copying machine has been described, but the present invention can also be applied to reading an image of a FAX or a computer.

[0016]

As described above, according to the image reading unit of the present invention, the light reflected by the original or the like is reflected by at least one of the plurality of reflecting mirrors housed in the reading unit. Is reflected multiple times in different directions and guided to the imaging lens. As a result, the number of reflection mirrors can be reduced as compared with the conventional image reading unit in which the reflection mirrors are provided as many times as the number of times the light is reflected, so that the size can be reduced and the size of the reflection mirrors can be reduced. The number of mounting steps can be reduced.

[Brief description of drawings]

FIG. 1 is a first image reading unit according to the present invention.
Sectional view showing an embodiment

FIG. 2 is a second image reading unit according to the present invention.
Sectional view showing an embodiment

FIG. 3 is a sectional view showing an embodiment of a conventional image reading unit.

[Explanation of symbols]

12 ... Illumination lamp 26 ... Imaging lens 28 ... Solid-state imaging device 30 ... Platen glass 32 ... Original document 40, 58 ... Reading unit 44, 46, 48, 50, 52, 60, 62, 64, 6
6 ... Reflective mirror

Claims (1)

[Claims] 1. A light source for irradiating a document placed on a platen glass with light, a plurality of reflection mirrors for reflecting the light reflected by the document a plurality of times, and a plurality of reflection mirrors arranged at the last stage. In an image reading unit in which an imaging lens that forms an image of the light reflected by a reflection mirror and an imaging unit that is arranged in the imaging unit of the imaging lens are housed, An image reading unit, wherein at least one of the plurality of reflecting mirrors reflects the light reflected by the document or the like a plurality of times in different directions and guides the light to the imaging lens.