JPS60244149A - Image reading device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to an image reading device, and particularly to an image reading device that reads an image using a same-magnification sensor using transmitted light from a document. .

[Prior Art] Conventionally, this type of device has been widely used as an image reading device of a facsimile machine, etc.

Figure w41 shows the structure of this type of conventional image reading device.
In Fig. 1, what is indicated by the symbol l is a manuscript, and the manuscript 1
has image information to be read on its underside,
It is moved in the left (or right) direction in the figure by a predetermined scanning line width by a conveying means (not shown). The lower surface of the document l is illuminated by an LED array 2.3. The LED array 2.3 is made up of a plurality of LEDs mounted on an elongated water support member, and the irradiated light from the LED arrays 2 and 3 is transmitted through a glass rod 4.5 that functions as a lens and a contact glass 6. The light is focused on the reading position.

The reflected light from the original passes through the contact glass 6 again and is imaged on a 1-magnification sensor 8 using a CCD sensor or the like via a SELFOC lens array 7.

Normally, the SENFOC lens array 7 and the same-magnification sensor 8 are provided slightly longer than the width of the original 1 in the direction perpendicular to the drawing.

In this conventional configuration, the reading elements of the illumination means are placed on the same side of the document, so it is not possible to place the sensor in close contact with the document despite the use of a full-size sensor due to mounting space constraints. Therefore, it is necessary to use an imaging means such as the SELFOC lens array 7 shown in FIG. Therefore, glass rods 4 and 5 are required as light condensing means to compensate for the insufficient amount of light.

As described above, in the conventional example, it could not be constructed without using a condensing means and an imaging means which were originally unnecessary, so there was a drawback that the cost was high, the structure was complicated, and a large mounting space was required.

[Objective] The present invention has been made in order to eliminate the above-mentioned conventional drawbacks, and it is an object of the present invention to provide an image reading device that can be constructed easily and inexpensively and can be implemented in a small space.

[Example] Hereinafter, the present invention will be described in detail based on the example shown in the drawings.

[First example] FIGS. 2 and 3 (two show the first embodiment of the present invention).

FIG. 2 is a perspective view of the image reading apparatus of the present invention, in which a document l has image information on its lower surface (back surface).

The original 1 is exposed to the LED from above through the contact glass 10.
It is illuminated by array 11. The illumination light passes through the original 1 and directly enters the 1x sensor 12 arranged on the opposite side of the original 1 through the LED array 11 and the contact glass 10.

In the above configuration, as shown in the side view of FIG. 3, reading can be performed while moving the original l by the scanning line width to the left (or right). contact glass 1
By using means for bringing the original l into close contact with the same-size sensor 12, such as pressing the original l with its own weight, no imaging means is required between the upper side of the original l and the same-size sensor 12. . Furthermore, since the LED array 11 serving as illumination means is located on the opposite side from the equal-magnification sensor, it can be provided close to the original l, and no light condensing means is required. Or, if a light condensing means is provided, its location.

The refractive index, etc. can be set with a higher degree of freedom than in the past.

[Second Example] In the above example, an LED array was used as the lighting means.
As shown in FIG. 4, a fluorescent lamp 13 may be used as the illumination means.

In this case, since the fluorescent lamp 13 has a cylindrical shape and its surface is glass, it has very good sliding properties and can smoothly guide the document position without using a guide means such as a contact glass. Optical means and imaging means are not required, and an image reading device with a small mounting space can be easily realized at low cost.

[Effects] As is clear from the above description, according to the present invention, in an image reading device that reads an image of a document using a 1-size sensor, a light source for reading is provided on the side opposite to the 1-size sensor with respect to the document. Since it adopts a configuration in which a light source and a 1x sensor are placed close to a document, an excellent image reading device that is simple, inexpensive, and requires a small mounting space can be provided without using an imaging means or a condensing means. be able to.

[Brief explanation of drawings]

Figure 1 is a side view of a conventional image reading device, Figures 2 and 3 are
The figures show a first embodiment of the present invention, FIG. 2 is a top perspective view of the image reading device, FIG. 3 is a side view thereof, and FIG. 4 is a second embodiment of the image reading device of the present invention. It is a side view which shows an example. l... Original 10... Contact glass 11...
LED array 12...Same size sensor 13...Fluorescent lamp

Claims (1)

[Claims] What is claimed is: 1. An image reading device for reading an image of a document using a 1-size sensor, characterized in that a light source for reading is provided on the side of the document opposite to the 1-size sensor.