JP3114285B2 - Illumination device for transparent documents - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art A reflection original such as a printed matter on
Japanese Patent Application Laid-Open No. 63-2 is an image input apparatus capable of reading both originals by mounting a transparent original such as a positive film.
As shown in 76363, a light source for a reflection original, a photoelectric conversion unit and a driving unit therefor, and a driving unit for a transmission original are also built in the main body, and only the transmission light source is exposed to be connected through the connection opening of the main body. It discloses a configuration and a configuration in which both a transmission light source and a driving unit are incorporated in a cover that can be rotated and opened in the main body.

[0003]

However, in the prior art, the former configuration requires an opening in the main body to connect the transmission driving means in the main body and the transmission light source, and when a commercial power supply is built in, the dust and metal It is unreasonable that general users who do not need to read a special original, such as a transparent original, also purchase a light source and a driving means for the transparent original because there is a danger of a piece entering and there is no danger.

In the case of the latter configuration, the light source and the driving means are incorporated in the openable and closable transmission unit, so that the transmission unit becomes heavy, so that the opening and closing mechanism becomes large. There is also irrationality for users who do not need it.

[0005]

SUMMARY OF THE INVENTION Accordingly, the present invention provides an original platen.
The first light source that irradiates light from below to the original placed on
And photoelectric conversion means for reading light reflected from the original,
Driving means for moving at least the first light source in the sub-scanning direction
To read a transparent original in an image input device having
Illuminating device for transparent originals, placed on an original platen
Built-in second light source that irradiates light from above
Light source unit and the second light source in the sub-scanning direction.
Drive unit, and the drive unit
It can be attached to and detached from the device, and the light source unit can be rotated.
It is characterized by supporting .

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the embodiments shown in the drawings. FIG. 1 is an external view showing the general concept of the present invention, and FIG.
Is a side view with a partial cross section. FIG. 3 is a partial cross-sectional view in a direction orthogonal to FIG. A transparent document table 2 is provided on the upper surface of the main body 1 of the image input apparatus, and a first light source 3 for irradiating a reflective document with light and a reflected light from the first light source 3 are received on an inner surface of the document table 2. The carriage 5 mainly composed of the photoelectric conversion unit 4 for main scanning can be reciprocated in the sub-scanning direction A of the photoelectric conversion unit 4 by the first driving unit 8 composed of the motor 6, the driving belt 7, and the like. Configuration. Further, the first light source 3 is constituted by an RGB three-color light source for color reading. Further, a transparent reading window 9 having the same height and thickness as the document table 2 is provided at a position of a non-reading section separately from the document table 2. Main body 1 in sub-scanning direction A
The openable and closable reflective document cover 10 is provided in such a size that the document table 2 can be covered, with the end on the upstream side as a supporting point. On the document table 2 side of the reflection document cover 10, a white reflector 11 for diffusing and reflecting light is attached. Naturally, the reflective original cover 10 is used to cover the original platen when reading a reflective original, and rotates and retracts from the original platen 2 when reading a transparent original so that it does not interfere with the second light source 12 described later. I have. The inner surface of the member between the platen 2 and the reading window 9 is a white reflecting surface, which reflects the light of the first light source 3 and is read by the photoelectric conversion means 4 to obtain reference data for shading correction for the reflected document. Is done.

On the other hand, a second light source 12 for irradiating light to the transparent original is built in a position orthogonal to the reflective original cover 10 in a plane, that is, 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 supporting the light source unit 19 movably in the sub-scanning direction A is fixed to the main body 1 so as to be detachable. The transparent original reading unit including the driving unit 14 and the light source unit 19 is formed to have a substantially T-shape in a plan view. The second light source 12 has the same R as the first light source 3 for color reading.
The original is covered with a three-color light source of GB, and the original side is covered with a white translucent diffusion plate 15. The second driving means 13 includes a motor 16,
The carriage 5 includes a drive belt 17, a guide shaft 18, and the like, and is driven so that the carriage 5 having the first light source 3 and the second light source 12 can move in synchronization with each other in the sub-scanning direction. Further, as shown in FIG. 3, the light source unit 19 is rotatably held about a guide shaft 18 as a fulcrum with respect to a drive unit 14 including the second drive means 13 as shown by a two-dot chain line in the figure. The connecting member 24 fixed to the drive belt 17 and moving the light source unit 19 does not rotate. It is configured to be able to retreat from the document table 2 when reading a reflected document. In addition, the light source unit 19 is
The document is supported by the guide shaft 18 and the projection 20 so that the document can be irradiated with a stable light amount while maintaining an appropriate distance from the document table 2 when the document is tilted. As described above, 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, so that the light source unit 19 is lightweight and compact, and the drive unit 14 is It is fixed to the main body 1 without rotating,
There is no worry about damage. The reference data for shading correction for the transparent original is such that the light from the second light source 12
It is configured to be obtained by being guided to the photoelectric conversion means 4 through the reading window 9 so as to be able to perform both the reflection original transmission original and the original on the original table 2 at the time of reading the reference data without any trouble.

The operation of reading each document will be further described. First, when reading a reflective original, the light source unit 19 having the second light source 12 is rotated and retracted so that the reflective original cover 10 is
After the document B is placed on the upper surface of the document table 2 by rotating and retracting, the reflective 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 document 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. To read the image of the entire original. At this time, the second light source 12 and the second driving means 13 are both turned off and not driven by the switching means. Next, when reading a transparent original, the reflective original cover 10,
The document B is placed on the upper surface of the document table 2 while the light source unit 19 having the second light source 12 is also 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 unit, the second light source 12 is turned on, the transmitted light from the transmissive document is received and read by the photoelectric conversion unit 4, and the first driving unit 8 and the second driving unit 13 are synchronized. The light source unit 19 having the second light source 12 and the carriage 5 are driven in the sub-scanning direction A.
To read the image of the entire document. Of course, the light source unit 19 does not cover the entire document B, but covers only the reading position. Since the second light source 12 emits light at a position sufficiently close to the document B, the light source unit 19 does not affect the image. Reading is possible.

FIG. 4 shows another embodiment in which an automatic document feeder 20 (hereinafter, abbreviated as ADF) that can be rotated and opened similarly is mounted in place of the reflective original cover 10 using the same opening and closing support portion. The ADF includes a paper feed stacker 21 and a paper feeder 22.
The paper ejection stacker 23 is schematically configured. A white reflector is attached to the lower surface of the paper discharge stacker 23 in the same manner as the reflective document cover 10, and the ADF 20 can be opened to place a reflective document on the document table 2. When reading a plurality of reflection originals continuously, the originals are placed on the paper feed stacker 21 and passed through the paper feed unit 22 while pressing the originals against the reading window 9 to pass the first light source 3.
The reflected light from is read by the photoelectric conversion means 4. At this time, the carriage 5 stops, and the sub-scan is performed by feeding the paper of the ADF 20. When reading a transparent original, the ADF 20 is rotated and retracted, and is read in the same manner as in the above-described embodiment. The reading window 9 is configured to be able to serve both as a document table for reading an image of the ADF 20 and for reading shading correction data for a transparent document.

As described above , according to the present embodiment, the opening for connecting to the main body required in the former of the prior art is required.
Is not necessary, since space is also unnecessary that the second light source is a planar manner retracted from platen, an image input device can also be small
You . Also , for users who do not need to read transparent documents,
In other words , there is no need to purchase an illumination device for transparent documents ,
There is no unnecessary cost burden. Further, in the present invention, the light source unit
Since the Tsu bets are to be rotated, it can be easily performed lamp replacement.

In the latter configuration of the prior art, since the transmission light source and the driving means are incorporated in the transmission unit , the transmission unit becomes heavy, and the mechanism of the opening and closing section of the unit is inevitably strong and large . requiring, but the light source Uni in the present invention
Since Tsu preparative only rotating, opening and closing mechanism becomes lighter becomes well as simple and compact.

[0012]

【The invention's effect】 As described above, according to the present invention, the image
No opening is required to connect to the input device,
There is no need for space for the tray to retreat flat from the platen.
Therefore, the size of the image input device can be reduced. Also, when reading a transparent manuscript
For users who do not need to trim,
There is no need to purchase an
No. Furthermore, since the light source unit is rotatable,
Pump replacement is also easy. Also, rotate only the light source unit.
Because it is made to move, the rotating part is lightweight and opens and closes
The mechanism is simple and compact.

[Brief description of the drawings]

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

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

FIG. 3 is a sectional view in a direction orthogonal to FIG. 2;

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

[Explanation of symbols]

 2 Document table 3 First light source 4 Photoelectric conversion means 5 Carriage 8 First driving means 9 Reading window 10 Reflecting document cover 12 Second light source 13 Second driving means 14 Drive unit 19 Light source unit 20 Automatic document feeder (ADF) A Sub-scanning direction B Original

Continuation of the front page (56) References JP-A-63-252062 (JP, A) JP-A-63-276363 (JP, A) JP-A-2-1577781 (JP, A) JP-A-3-85867 (JP) JP-A-3-91364 (JP, A) JP-A-3-91367 (JP, A) JP-A-4-156167 (JP, A) JP-A-5-41774 (JP, A) 3-82967 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) H04N 1/04-1/207

Claims (1)

(57) [Claims] A light source for applying light to a document placed on the document table from below;
A first light source to irradiate and read reflected light from the original
Sub-scanning at least the first light source
Driving means for moving in the direction,
Illuminator for transparent originals to read transparent originals
And illuminates the transparent original placed on the platen from above.
A light source unit incorporating a second light source for emitting light,
And a drive unit that moves the light source in the sub-scanning direction.
The drive unit is detachable from the image input device.
And rotatably supporting the light source unit.
Characteristic irradiation device for transparent originals.