JPH05122454A - Picture input device - Google Patents

Abstract

PURPOSE:To provide the picture input device which can arbitraily and easily read transmission documents and reflection documents and is rational with respect to cost and size. CONSTITUTION:A carriage 5 consisting of a first light source 3 for reflection document and a photoelectric conversion means 4 and a first driving means 8 which subscans this carriage 5 are provided in a main body, and a reflection document cover 10 is turnably provided in the main body, and a second driving means for transmission document and a second light source 12 are divisionally constituted and are provided on the outside of the main body, and a driving unit 14 incorporating the second driving means is detachably fixed to the main body, and the second light source 12 is supported to the driving unit 14 so that it can be turned and removed from a platen 2. At the time of reading a reflection document, the first light source 3 is lit, and the carriage 5 is subscanned to read the image. At the time of reading a transmission document, the second light source 12 is lit, and the second driving means and the first driving means 8 are synchronously subscanned to read the image.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image input device for easily reading both reflection and transmission.

[0002]

2. Description of the Related Art Reflective originals such as printed matter are placed on the upper surface of an original table.
An image input device capable of reading both originals by placing a transparent original such as a positive film is disclosed in Japanese Patent Laid-Open No. 63-2.
As shown by reference numeral 76363, a light source for a reflective original, a photoelectric conversion means, and a driving means for the transparent original are also incorporated inside the main body, and only a light source for the transparent original is exposed to be connected through a connecting opening portion of the main body. It is disclosed that the light source for transmission and the driving means are both built in a cover that can be rotated and opened and closed in the main body.

[0003]

However, in the prior art, in the former configuration, an opening is required in the main body to connect the transmission driving means in the main body and the transmission light source, and a commercial power source is built-in. It is unreasonable that a light source and a driving means for a transparent original may be purchased even for a general user who does not require a special original reading as a transparent original because there is a risk that one piece may enter.

In the latter case, the light source and the driving means are built in the transmissive unit which can be opened and closed, and the transmissive unit becomes heavy, so that the mechanism for opening and closing becomes large, and the transmissive unit has the same structure as the former. There is also an absurdity for users who do not need it.

[0005]

SUMMARY OF THE INVENTION Therefore, according to the present invention, in an image input device for reading a document on a document table, a first light source for irradiating a reflected document from the inside of the document table, and a reflection from the first light source. A photoelectric conversion unit that reads light, a carriage that includes a first light source and a first driving unit that moves the photoelectric conversion unit in the sub-scanning direction, and a second light source that irradiates the transparent document with light from above the document table A light source unit and a drive unit having a second drive means for movably supporting the second light source in synchronism with the first light source are provided outside the main body, and the drive unit is detachably fixed to the main body The light source unit is rotatably supported by the drive unit, and when the light source unit is rotated and retracted from the document table, it covers the document table and can be rotated and retracted when the light source unit is on the document table. The reflective original cover provided, when the reflective original reading when the transparent original reading the primary light source illuminates, characterized in that the second light source lights up.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on the embodiments shown in the drawings. FIG. 1 is an external view showing the overall concept of the present invention, and FIG.
FIG. 3 is a side view with a part in section. FIG. 3 is a partial cross-sectional view in the direction orthogonal to FIG. A transparent manuscript table 2 is provided on an upper surface of a main body 1 of the image input device, and an inner surface of the manuscript table 2 receives a first light source 3 for irradiating a reflected manuscript with light and a reflected light from the first light source 3. The carriage 5 mainly composed of the photoelectric conversion means 4 for main scanning can reciprocate in the sub-scanning direction A of the photoelectric conversion means 4 by the first driving means 8 composed of the motor 6, the driving belt 7 and the like. It has become a structure. The first light source 3 is composed of RGB three-color light sources for color reading. Further, in addition to the document table 2, a transparent reading window 9 is arranged at the position of the non-reading portion with the same height and thickness as the document table 2. Main body 1 in sub-scanning direction A
A reflective original cover 10 that can be opened and closed is provided in such a size that it can cover the original table 2 with the upstream end thereof as a fulcrum. A white reflection plate 11 that diffuses and reflects light is attached to the document table 2 side of the reflection document cover 10. Naturally, the reflective original cover 10 is used by covering it on the original table when reading the reflective original, and pivots to retract from the original table 2 when reading the transparent original so as not to interfere with the second light source 12 described later. There is. The inner surface of the member between the original table 2 and the reading window 9 is a white reflecting surface, which reflects the light from the first light source 3 and is read by the photoelectric conversion means 4 to be used as reference data for shading correction for reflected originals. To be done.

On the other hand, a second light source 12 for irradiating a transparent original with light is built in at a position orthogonal to the reflective original cover 10 in a plane, that is, at a position not overlapping the reflective original cover 10 in the direction of the side surface of the main body 1. A drive unit 14 having a built-in second drive means 13 for movably supporting the light source unit 19 in the sub-scanning direction A is detachably fixed to the main body 1. The transparent original reading unit including the drive unit 14 and the light source unit 19 is formed to have a substantially C shape in a plan view. Also, the second light source 12 is the same as the first light source 3 for reading the color.
It is composed of a GB three-color light source, and the original side is covered with a white translucent diffusion plate 15. The second drive means 13 is a motor 16,
The drive belt 17, the guide shaft 18, and the like are configured to drive the carriage 5 having the first light source 3 and the second light source 12 so as to be movable in synchronization with each other in the sub-scanning direction. Further, as shown in FIG. 3, the light source unit 19 is rotatably held with a guide shaft 18 as a fulcrum with respect to a drive unit 14 having a second drive means 13 therein, as indicated by a chain double-dashed line in the figure. The connecting member 24, which is fixed to the drive belt 17 and moves the light source unit 19, does not rotate. It is configured so that it can be retracted from the document table 2 when reading a reflective document. The light source unit 19 is attached to the document table 2.
It is supported by a guide shaft 18 and a projection 20 so that when the document is tilted, a proper distance is maintained between the document table 2 and the document can be irradiated with a stable light amount. Since the transparent original reading unit is divided into the drive unit 14 and the light source unit 19 rotatably supported by the drive unit 14 as described above, the light source unit 19 is lightweight and compact, and the drive unit 14 is Fixed to the main body 1 without turning
There is no worry of damage. The reference data for the shading correction for the transparent original is the light from the second light source 12, the diffusion plate 15,
It is obtained by being guided to the photoelectric conversion means 4 through the reading window 9, and it is configured so that even if there is an original on the original table 2 at the time of reading the reference data, both the reflective original and the transparent original can be performed without any trouble.

The reading operation of each original will be further described. First, at the time of reading a reflective original, the light source unit 19 having the second light source 12 is pivoted and retracted to reflect the reflective original cover 10.
Also, the document B is placed on the upper surface of the document table 2 by rotating and retracting, and then the reflection document cover 10 is rotated to cover the document B on the document table 2.
Then, only the first light source 3 is turned on by the switching means (not shown), the reflected light from the original B is received and read by the photoelectric conversion means 4, and the carriage 5 is scanned in the sub-scanning direction A by the first driving means 8. The entire original image is read. At this time, the second light source 12 and the second driving means 13 are both non-lighted and non-driven by the switching means. Similarly, when the transparent original is read next time, the reflective original cover 10,
The original B is placed on the upper surface of the original table 2 with the light source unit 19 having the second light source 12 rotated and retracted. Then, the light source unit 19 having the second light source 12 is rotated toward the document table 2 to cover the document B. The first light source 3 is turned off by the switching means, the second light source 12 is turned on, the transmitted light from the transparent original is received and read by the photoelectric conversion means 4, and the first drive means 8 and the second drive means 13 are synchronized. The light source unit 19 having the second light source 12 driven by the carriage 5 and the carriage 5 are moved in the sub-scanning direction A.
You can read the image of the entire document by moving to. Of course, the light source unit 19 does not cover the entire document B, but covers only the reading position, and since the second light source 12 irradiates the document B at a position sufficiently close to the document B, the image of the image is not affected by external light. It is readable.

Further, FIG. 4 shows another embodiment in which an automatic document feeder 20 (hereinafter abbreviated as ADF), which can also be rotated and opened, is mounted instead of the reflective document cover 10 using the same opening / closing support part. This ADF includes a paper feed stacker 21 and a paper feed unit 22.
The sheet stacker 23 is generally configured. A white reflector is attached to the lower surface of the paper discharge stacker 23 as in the case of the reflection original cover 10, and the reflection original can be placed on the original table 2 by opening the ADF 20. When reading a number of reflective originals in succession, the originals are placed on the paper feed stacker 21 and the originals are passed through the paper feeding unit 22 while pressing the originals against the reading window 9 and the first light source 3
The reflected light from is read by the photoelectric conversion means 4. At this time, the carriage 5 is stopped and the sub-scanning is performed by the paper feed of the ADF 20. When reading the transparent original, the ADF 20 is rotated and retracted, and the original is read in the same manner as in the above-described embodiment. The reading window 9 is configured so that it can serve both as a document table for image reading of the ADF 20 and for reading shading correction data for transparent documents.

[0010]

As described above, according to this embodiment, the space for the second light source to retreat in a plane from the platen is not provided with an opening for connecting to the main body unlike the former configuration of the conventional example. Is unnecessary, and the image input device becomes small. Further, since it is not necessary for a user who does not need to read the transparent original to purchase the transparent second light source and the second driving means, there is no cost burden. Further, in the present invention, since only the second light source is rotatable, the lamp can be easily replaced.

In the latter construction of the conventional example, the transmissive light source and the driving means are built in the transmissive unit, and the transmissive unit becomes heavy, so that the mechanism of the opening / closing section of the unit is inevitably strong and large. In the present invention, since only the second light source is rotated, the weight is reduced and the opening / closing mechanism is simple and compact. Also, when reading a reflective original, it is necessary to open and close a heavy transparent original unit for each operation, which results in poor operability. However, if only the second light source is retracted, opening and closing the reflective original cover will improve operability.

Further, according to the present invention, since the opening / closing support portion of the reflection original cover is provided on the upstream side in the sub-scanning direction, the ADF can be used in place of the reflection original cover as shown in another embodiment. An image input device capable of reading various originals, such as placing the originals on the original table when reading the originals one by one, and using the ADF when continuously reading the originals. Become.

[Brief description of drawings]

FIG. 1 is an external view showing the overall concept of the present invention.

FIG. 2 is a side view showing a part of the present invention in section.

FIG. 3 is a cross-sectional view in a direction orthogonal to FIG.

FIG. 4 is a side view of another embodiment of the present invention.

[Explanation of symbols]

 2 Document Plate 3 First Light Source 4 Photoelectric Conversion Means 5 Carriage 8 First Driving Means 9 Reading Window 10 Reflective Document Cover 12 Second Light Source 13 Second Driving Means 14 Driving Unit 19 Light Source Unit 20 Automatic Document Feeding Device (ADF) A Sub-scanning direction B original

Claims (1)

[Claims] 1. An image input device for reading a document on a platen, comprising: a first light source for irradiating a reflected document from the inside of the platen; a photoelectric conversion unit for reading the reflected light from the first light source; A light source unit that includes a carriage that includes one light source and a first driving unit that moves the photoelectric conversion unit in the sub-scanning direction, and that includes a second light source that includes a second light source that irradiates the transparent document with light from above the document table is provided. A transmissive unit including a drive unit having a second drive means for movably supporting in synchronization with the first light source is provided outside the main body, and the drive unit is detachably fixed to the main body, and the light source unit is rotated to the drive unit. A reflective original cover is provided that movably supports and covers the original table when the light source unit is rotated and retracted from the original table and is rotatable and retracted when the light source unit is on the original table. An image input device characterized in that a first light source is turned on when reading and a second light source is turned on when reading a transparent original.