JP2755629B2 - Image information reading device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial application field) The present invention relates to an image information reading apparatus used for, for example, a printer or a facsimile, and more specifically, to reflected light or transmitted light according to the type of a document. The present invention relates to an image information reading apparatus that can read image information on a document by using light.

(Prior Art) As an image information reading apparatus capable of reading image information on an original using reflected light or transmitted light according to the type of the original, for example, an apparatus as shown in FIG. 2 has been proposed. ing.

According to this apparatus, a carriage 20 having a light source (fluorescent lamp) 21 for transmitted light is placed above a document table 10 made of a transparent glass plate or the like by a first driving mechanism 40.
A carriage 30 equipped to scan over the document A of 10 and equipped with a light source (fluorescent lamp) 31 for reflected light is provided below the document table 10 by a second drive mechanism 50.
To scan the original A.

Here, in addition to the light source 31 for reflected light, the carriage 30 includes a photoelectric conversion element 32 composed of a CCD that receives light from the light source 21 transmitted through the document A and light from the light source 31 reflected from the document A, and A printed circuit board (not shown) equipped with an amplifier circuit for amplifying the output of the photoelectric conversion element 32 is provided. The first drive mechanism 40 includes a guide rail 41 located on one side of the carriage 20 and disposed in parallel with the document table 10.
A first support means 40a comprising a rail shaft 42, a guide 41, a motor 43 as a drive source disposed at one end of the rail shaft 42, and a motor 43 disposed at one end of the rail shaft 42 and driven by the motor 43. An endless annular timing belt 46 wound around a driven pulley 45 disposed at the other end of the rail shaft 42. The carriage 20 is fixed to the timing belt 46. Further, the second driving mechanism 50 is a guide that is located on both sides of the carriage 30 and that is disposed in parallel with the original table 10.
51, a second support means 50a comprising a rail shaft 52,
A motor 53 as a drive source disposed at one end of the rail shaft 52, a drive pulley 54 disposed at one end of the rail shaft 52 and driven by the motor 53, and disposed at the other end of the rail shaft 52. And an endless annular timing belt 56 wound around a driven pulley 55,
The carriage 30 is fixed to the timing belt 56.

In the image information reading device, the light source 31 is turned on,
When the motor 53 is operated, the carriage 30 scans over the document A, the light of the light source 31 irradiates the document A, and the light reflected by the document A is imaged on the photoelectric conversion element 32. Also, when the light source 21 is turned on and the motor 43 and the motor 53 are operated,
The carriage 20 scans over the document A, the light of the light source 21 is irradiated on the document A, and the transmitted light transmitted through the document A is transmitted to the carriage 20.
An image is formed on the photoelectric conversion element 32 of the carriage 30 that moves in synchronization with the image. That is, it is possible to read image information with reflected light reflected by the document A, or to read image information with transmitted light transmitted through the document A.

(Problems to be Solved by the Invention) However, according to the image information reading device, the motor 43 for driving the carriage 20 and the motor 53 for driving the carriage 30 are separate, and the control becomes complicated. Was likely to occur. That is, the carriage 20 (the light source 21 for transmitted light) and the carriage 30 (the photoelectric conversion element 32) are not synchronized with each other, and there is a possibility that image information cannot be read favorably with transmitted light. In addition, since the motor 43 and the motor 53 are provided, there are problems such as a complicated structure of the device, an increase in the weight of the entire device, and an increase in cost.

Therefore, the present invention can read image information using reflected light and transmitted light, and can read image information well with transmitted light, and furthermore, the structure of the device is simple and the weight of the device is small. It is an object of the present invention to provide an image information reading apparatus capable of reducing the weight and further reducing the cost.

[Configuration of the invention]

(Means for Solving the Problems) In order to achieve the above object, according to the invention of claim (1), an image placed on a document table is scanned to read image information on the document. In the apparatus, a first light source for transmitting light for irradiating the document with light from above the document table and a first light source for supporting the light source for transmitted light movably in a predetermined direction along the document table. Supporting means, a light source for reflected light for irradiating the original from below the document table, and a light source for reflected light provided on the same side of the document table as the light source for reflected light. A photoelectric conversion element for receiving reflected light emitted from the light source and reflected by the original document or transmitted light emitted from the light source for the transmitted light and transmitted through the original document to read image information, and a light source for the reflected light And the photoelectric conversion element A second supporting means movably supporting the original supporting means in the same direction as the first supporting means along the document table; a light source for the transmitted light supported by the first supporting means; And a drive mechanism for synchronously moving the light source for reflected light and the photoelectric conversion element supported by the support means along the document table by the same drive source.

In the invention according to claim (2), the drive mechanism turns on the light source for the transmitted light, turns off the light source for the reflected light, and drives the drive source when the original is for transmission. Controlling to move the light source for the transmitted light and the photoelectric conversion element in synchronization with the original placing table,
When the document is for reflection, the light source for reflected light is turned on and the light source for transmitted light is turned off, and the light source for reflected light and the photoelectric conversion element are moved along the document table. This is a configuration having control means for performing such control.

(Function) In the invention of claim (1), the same driving source is driven to operate each driving unit, and the light source for transmitted light, the light source for reflected light, and the photoelectric conversion element are synchronously moved. Then, the document on the document table is scanned.

In the invention of claim (2), when the original is for transmitted light, the control means turns on the light source for transmitted light and turns off the light source for reflected light to scan the original, and the original is scanned by the photoelectric conversion element. The transmitted light transmitted through is received. If the original is for reflection, the control unit turns on the light source for reflected light,
The original is scanned by turning off the light source for transmitted light, and the reflected light reflected by the original is received by the photoelectric conversion element.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing one embodiment of the present invention. In the figure, the same components as those shown in FIG.
The same reference numerals are given and the detailed description is omitted.

The image information reading device E of the present embodiment is
A scanning light source 21 for scanning the original document A placed on the upper surface and reading image information on the original document A, irradiating the original document A with light from above the original table 10.
A first support means 40 for supporting the light source 21 for transmitted light so as to be movable in predetermined directions B and C along the document table 10.
a, a light source 31 for reflected light that irradiates light to the document A from below the document table 10, and the light source 31 for reflected light is provided on the document table 10 on the same side as the light source 31 for reflected light. A photoelectric conversion element 32 that receives reflected light radiated from the light source 31 for reflected light and reflected by the document A or transmitted light radiated from the light source 21 for transmitted light and transmitted through the document A to read image information and read image information A second support for supporting the reflected light source 31 and the photoelectric conversion element 32 movably along the document table 10 in the same directions B and C as the first support means 40a.
Support means 50a, the transmitted light source 21 supported by the first support means 40a, the reflected light source 31 and the photoelectric conversion element 32 supported by the second support means 50a, And a drive mechanism 70 for moving the same along the original table 10 by the same drive source 53 in synchronization with each other. That is, the light source 21 and the photoelectric conversion element are
By driving the drive units 32 and moving them in synchronization with each other, it is possible to read good image information.

Further, the drive mechanism 70 of the present embodiment turns on the light source 21 for transmitted light and turns off the light source 31 for reflected light when the original A is for transmission, and drives the drive source 53. Then, the light source 21 for the transmitted light and the photoelectric conversion element 32 are controlled so as to be synchronously moved along the document table 10, and the light source for the reflected light is used when the document A is for reflection. 31.Control means for turning on the light source 31, turning off the light source 21 for the transmitted light, and controlling the light source 31 for the reflected light and the photoelectric conversion element 32 to move along the document table 10. And

Hereinafter, mainly the drive mechanism 70 will be described in detail,
Light source 21 for transmitted light, carriage 20, first support means
40a, light source 31 for reflected light, photoelectric conversion element 32, carriage 3
The structure of the second support means 50a is the same as that of the conventional example shown in FIG.

The drive mechanism 70 has a first drive means 40b for moving the carriage 20 along the first support means 40a, and a drive source 53 provided opposite to the first drive means 40b. A second drive means 50b for moving the carriage 30 along the second support means 50a by the operation of the source 53, and a third drive means 65 for transmitting the rotation of the drive means 50b to the first drive means 40b; And control means for controlling the operation of each of these drive means 40b, 50b, 65 and controlling the turning on and off of each light source as described later.

More specifically, the drive pulley 54
Drive pulley driven by motor 53 on the same axis as
A driving connection pulley 61 is provided coaxially with the driving pulley 44 on the driving pulley 44 side. Have been.

That is, the motor 43 (the second
(See the figure) and remove the driving side connection pulley 60, the connection belt 62, and the first drive means 40b and the second drive means 50b.
By providing the driven-side connection pulley 61, the rotation of the motor 53 is transmitted to the carriage 20 side.

Therefore, when the motor 53 is operated, the driving pulley 54
Rotates, the driving side connection pulley 60, the connection belt 6
2. The rotation of the motor 53 is also transmitted to the drive pulley 44 via the driven side connection pulley 61, and the drive pulley 44 rotates.

When the image information of the document A is read by the transmitted light, the motor 53 is operated by the control means (not shown) to turn on the light source 21. As a result, the drive pulleys 54 and 44 rotate, the timing belts 56 and 46 run in the directions of arrows B and C shown in FIG. 1, and the carriage 20 (light source 21) and the carriage 30 (photoelectric conversion element 32) are synchronized. Then, the original A is scanned. During this scanning, light from the light source 21 passes through the document A, and the transmitted light enters the photoelectric conversion element 32 (image formation). In this case, the light source
31 is kept off by the control means.

When reading the image information of the document A with the reflected light, the motor 53 is operated and the light source 31 is turned on. As a result, the carriage 30 (light source 31, photoelectric conversion element 32)
The upper side is scanned, and during this scanning, light from the light source 31 is reflected by the original A, and the reflected light is incident (images) on the photoelectric conversion element 32. In this case, the light source 21 is kept off.

When the carriage 20 and the carriage 30 are driven by the same drive source (motor 53) in this manner, their control is simplified, and therefore, the synchronization between the carriage 20 and the carriage 30 is easily achieved, and the reading of image information with transmitted light is performed. Can be performed well.

In addition, since only one motor 53 is required, the structure is simplified, so that the weight can be reduced and the cost can be reduced.

The positions of the light source 21 and the light source 31 can be adjusted in the carriages 20 and 30, respectively.

〔The invention's effect〕

As described above, according to the present invention, image information can be read using reflected light and transmitted light, and the light source for transmitted light and the photoelectric conversion element are moved by the same drive source. As a result, the two can be accurately driven synchronously, and can read image information with transmitted light satisfactorily. In addition, the structure of the device is simple, the weight of the device is reduced, and the cost can be reduced. Further, according to the invention of claim (2), unnecessary light sources are turned off, so that better reading can be performed.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention, and FIG. 2 is a perspective view showing a conventional technique. A Document 10 Document placement table 21 Light source for transmitted light 31 Light source for reflected light 32 Photoelectric conversion element 40a First support means 50a Second support means 53 … Drive source (motor) 70 …… Drive means

Claims (2)

(57) [Claims] An image information reading apparatus that scans a document placed on a document table and reads image information on the document, irradiating the document with light from above the document table. A light source for transmitted light; first support means for supporting the light source for transmitted light so as to be movable in a predetermined direction along the document table; and transmitting light to the document from below the document table. A light source for reflected light to be radiated; and a light source for reflected light or transmitted light that is provided from the light source for reflected light and is reflected from the light source for reflected light provided on the same side as the light source for reflected light with respect to the document table. A photoelectric conversion element that receives transmitted light emitted from a light source and transmitted through the document to read image information, and a light source for the reflected light and the photoelectric conversion element that are supported along the document table by the first support. Moveable in the same direction as the means A light source for transmitted light supported by the first support means, a light source for reflected light supported by the second support means, and the photoelectric conversion element. A drive mechanism for synchronously moving along the original table by the same drive source. And a drive mechanism for turning on the light source for transmitted light, turning off the light source for reflected light, and driving the drive source when the original is for transmission, thereby driving the drive source for the transmitted light. The light source and the photoelectric conversion element are controlled to move synchronously along the document table, and when the document is for reflection, the light source for reflected light is turned on and the light source for transmitted light is turned off. 2. The image information reading apparatus according to claim 1, further comprising control means for controlling the light source for reflected light and the photoelectric conversion element to move along the document table.