JPS6154759A - Original reader - Google Patents

Abstract

PURPOSE:To reduce the cost by making a readout scan on a reflective original and a transmissive original with the same illumination light source, and providing an optical path for a reflection read and an optical path for a transmission read as different systems and guiding light to a common CCD line image sensor. CONSTITUTION:When the reflective original is read out through a movable mirror 10, the light source 3 irradiate the reflective original on an original moving table 2 along a readout line A and reflected light is made incident on the CCD line image sensor 7 through the optical path of a reflected mirror 5, the movable mirror 10, and a readout lens 6. A light scattering plate 12 places on the original moving table 2, an original holder 13, and a unit 11 forming an optical path to the sensor 7 are used to read the transmissive original. When the transmissive original 1 is read, light from the lighr source 4 is transmitted through the original moving table 2 to strike the light scattering plate 12, and then scattered to pass through the original 1 and a film cover 14. Light reflected by reflecting mirrors 8, 9, and 10 reaches the sensor 7 through the readout lens 6.

Description

[Detailed Description of the Invention] Technical Field> The present invention relates to reflection reading in which an illumination light source illuminates a document and reads document information from the reflected light, and reflection reading in which an illumination light source transmits through the document and reads document information from the transmitted light. The present invention relates to a document reading device that has both functions of transparent reading.

More specifically, rather than a drum-type reading device in which the original is attached to the surface of a cylindrical drum and the cylindrical drum is rotated to read the document, the original is placed on a flat document table like in a general copier. The present invention relates to a flat-type reflective original and transparent original reading device.

<Prior art> In a flat document reading device, reflection reading J&, 11
) and a transmission reading function, a device having the configuration shown in FIG. 4 is generally known.

To explain the apparatus shown in FIG. 1, the document moving table 2
When the original 1 to be read is placed on top and reading is started, the original moving table 2 is moved in the direction of the arrow B at a predetermined timing by the original moving table driving device (not shown).

As for the original l, a reflective original is used for reflective reading, and a transparent original (in the form of a film) is used for transparent reading. The document moving table 2 is generally made of reinforced transparent plate glass. First, during reflective reading, the reflective illumination light source 3 illuminates the portion of the document 1 that is above the reading line A.

Information about the document 1 on the reading line A is transmitted onto the elements of the CCD line image sensor 7 by the reflecting mirror 5 and the reading lens 6. That is, an image of the reading line A is created by the reading lens 6 on the element of the CCD line image sensor 7. The original l moves in the direction of the arrow B at a predetermined timing, and the CCD line image is created in synchronization with the timing. The original is read by the sensor 7 reading the information on the original (■).

On the other hand, when reading a transparent original, the transparent reading light source 4
Use. At this time, the light from the transmission reading light source 4 is transmitted to the light scattering plate 4.
The light is scattered by the AK and provides uniform illumination to the transparent original l.

The light transmitted through the original 1 passes through the same optical path as the reflection reading, that is, the light passes through the reflection mirror 5. CCD via reading lens 6
It reaches the line image sensor 7. Then, the information on the transparent original is read in the same manner as above.

In this way, in an apparatus having both reflective reading and transmissive reading functions, a reflective reading light source 3 is required when reading a reflective original, and a separate light source 4 for transparent reading is required when reading a transparent original. Therefore, two types of light sources are required.

For this reason, the conventional device has a problem in that the cost of the device increases significantly because it is equipped with two types of illumination light sources dedicated to each type.

<Objective> The present invention provides an original reading device that can irradiate with a common illumination light source both when reading a reflective original and when reading a transparent original.

That is, an apparatus is provided in which a reflective original and a transparent original are read and scanned using the same illumination light source, but the optical path for reflective reading and the optical path for transparent reading are separated and guided to a common CCD line image sensor. This is an attempt to solve the high cost problem associated with conventional devices.

<Embodiment> The overall configuration of the apparatus of the present invention is shown in FIG. 1, and the same parts as in FIG. 4 described above are indicated by the same symbols.

That is, l is the original, 2 is the original moving table, 3 is the illumination light source, and 5
6 is a reflecting mirror, 6 is a reading lens, 7 is a CCD line image sensor, and A is a reading line of the illumination light source 3. The illumination light source 3 is arranged in the main body of the apparatus directly below the document moving table 2, and serves as a common light source used for both reflective and transparent documents.

In addition, a movable mirror 10 is arranged inside the main body of the apparatus, and when reading a reflective original, an illumination light source 3 illuminates the reflective original placed directly on the original moving table 2 with a reading line A, and the reflected original is illuminated with a reading line A. The reflected light from the original is reflected by a reflection mirror 5. Movable mirror 10. The light is incident on a CCD line image sensor 7 via an optical path leading to a reading lens 6 .

On the other hand, the light scattering plate 12 and the document holder 13 placed on the document moving table 2 and the unit 11 forming an optical path to the CCD line image sensor 7 are for reading a transparent document.

When reading the transparent original, a light scattering plate 12 made of milky white glass is placed on the original carriage 2. A transparent original 1 is placed on the light scattering plate 12 while being held by an original holder 13 shown in FIG.

The document holder 13 has a cutout portion 13B approximately equal to the size of the transparent document 1, and is made of an opaque film +3 having a predetermined size and having a thickness approximately equal to the thickness of the transparent document 1.
It is composed of A. Further, a long hole 13C for detecting the reading start timing and the reading end timing is formed along one side of the cutout portion 13B of the film IIA. This elongated hole 13c is set to have a length equal to the length of the transparent original. Incidentally, the long hole 13C portion may not be formed into a hole, and only this portion may be transparently formed with the film +3A.

Further, a transparent film cover 14 having one end attached to the light scattering plate 12 is provided, and the transparent original is
The original 1 placed in the cutout part 13B of the original holder 13 is brought into close contact with the light scattering plate I2 so that the original 1 maintains its flatness. The film cover 14 is preferably formed of a soft methyl methacrylate resin film with excellent transparency.

As shown in FIG.
is placed at a predetermined position on the document moving table 2 as shown in FIG.

That is, positioning plates 2A and 2B are provided on the document moving table 2 to regulate the front and rear of the light scattering plate 12, and the light scattering plate 12 is placed between the front and rear positioning plates 2A and 2B.

On the other hand, a unit 11 that forms an optical path for transmission reading is arranged above the moving path of the document moving table 2 from the position to the reading line, and is attached to the main body of the apparatus so as to be integrated with the document moving table 2. does not move.

This unit IIK is the transparent original located on the reading line A from the light source 3! a first reflecting mirror 8 that horizontally reflects the light that has passed through the first reflecting mirror 8; Two reflecting mirrors 9 are provided.

This unit 11 is detachably attached to the main body of the apparatus, and is installed in the main body of the apparatus when reading a transparent original. (22) When the I+ is installed, although not particularly shown, the link mechanism responds to the installation of the unit 11 and moves the movable mirror IO from the normal position shown by the solid line to the position shown by the broken line.

Furthermore, when the unit) I+ is removed, the movable mirror 10 is returned to the position shown by the solid line in response. These mechanisms can be easily achieved using the link mechanisms described above.

As a result, the light from the light source 3 that has passed through the transparent original is reflected by the reflection mirrors 8, 9, and 10, and an optical path for transparent reading is formed that reaches the reading lens 6° and the CCD line image sensor 7. The total length of this optical path is the same as the optical path length of the reflective reading optical path.

Therefore, when reading the transparent original 1, the light from the illumination light source 4 passes through the original moving table 2 and enters the light scattering plate 12. The light is scattered by the light scattering plate 12, passes through the original 1, and then passes through the film cover 14. The light reflected by the reflecting mirrors 8, 9, and 10 passes through the reading lens 6 and reaches the CCD line image sensor 7.

The original moving table 2 on which the transparent original l is placed moves in the direction indicated by B at a predetermined timing. In synchronization with this timing, the CCD line image sensor 7 reads the information of the document 1 on the reading line A, and by repeating this, transparent reading is performed.

On the other hand, in the case of reflective reading, the original 1 is placed directly on the original moving table 2 as described above, and the original 1 is brought into close contact with the original moving table 2 by a document presser (not shown). In this case, the unit 11 for transmission reading to which the reflection mirror 8.9 is attached is removed, and the movable mirror is attached accordingly! 0 indicates that the attachment indicated by a broken line is at a corner, and the attachment indicated by a solid line returns to a corner.

As a result, the light from the illumination light source 3 is reflected by the reflective original l, further reflected by the reflective mirror 5.10, passes through the reading lens 6, and is sent to the CC.
It reaches the D line image sensor 7. Original moving table 2Vi
Move in the direction of the arrow shown by B at a predetermined timing,
In synchronization with this timing, the CCD line image sensor 7 sequentially reads information on the reading line A of the original 1, thereby reading the reflective original 1.

Effects> As described above, in the document reading device of the present invention, when reading a reflective document and a transparent document, a common illumination light source is used during both reading operations to improve optical illumination of the document. Features include the ability to scan, there is no need to separately equip each dedicated illumination light source as in the past, and the optical path for reading transparent originals can be formed with a simple means, greatly reducing the cost of the entire device. has.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the overall configuration of the device of the present invention, FIG. 2 is a diagram showing the configuration of the holding portion for a transparent original in the same device, and FIG. 3 is a diagram showing the document moving table surface when reading a transparent original in the same device. 4 are diagrams showing the configuration of a conventional device. 1: Original, 2: Original moving table, 3: Illumination light source, 5: Reflective mirror, 6: Reading lens 7: CCD light image sensor, 8 and 9: Reflective mirror, IO: Movable mirror, 11: Unit, +2=light scattering plate, 13: transparent original holder, 14: film cover.

Claims (1)

[Scope of Claims] 1. In an original reading device having both reading functions of reading transparent originals and reading reflective originals, in the main body of the apparatus below the original moving table on which the transparent original or the reflective original is placed. a common illumination light source for a transmissive original and a reflective original disposed in the apparatus; and when the illumination light source illuminates the reflective original, the reflected light from the reflective original is guided to an image sensor for reading in the main body of the apparatus. a first optical system provided within the apparatus main body; and a first optical system that guides light transmitted through the transparent original from outside the apparatus main body to the image sensor inside the apparatus main body when the illumination light source illuminates the transparent original. and a second optical system provided for the reflection original and the transmission original provided in the apparatus main body, into which the light from the first optical system and the light from the second optical system are incident. A document reading device equipped with a common image sensor. 2. A patent claim in which the optical system means of the part located outside the device body constituting the second optical system is configured as a unit provided on one frame, and the unit is detachably attached to the device body. The document reading device according to item 1.