JP2902924B2 - Image reading device - 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 reading apparatus which employs a line image sensor for reading a transparent original placed on a platen, and more particularly to an image reading apparatus which realizes reading of a transparent original according to a small number of parts. It relates to a reading device.

An image reading device has a function of reading image information of a document using a line image sensor, and there is a demand for reading a transparent document such as an X-ray film.

In response to such a transparent document reading request,
It is necessary to build a configuration that allows reading of a transparent original according to a simple configuration.

[0004]

2. Description of the Related Art FIG. 6 shows a conventional configuration of an image reading apparatus for reading both a reflection original and a transmission original.

In the drawing, reference numeral 10 denotes a housing, 11 denotes a document table made of transparent glass, which is provided on the upper surface of the housing 10 and mounts a document to be read, and 12 denotes a rotation fulcrum shaft. A document holding cover that opens and closes around the document center, and has a diffusion plate 13 on a surface that comes into contact with the document table 11, and fixes the document placed on the document table 11 using the diffusion plate 13. Denotes an optical unit, and a line image sensor 1 for reading image information of a document placed on a document table 11.
5 and a reflection light source 1 for illuminating a document placed on a document table 11
6 and a lens / reflection mirror for forming an image of the document surface on the line image sensor 15.

Reference numeral 17 denotes a motor which moves the optical unit 14 in the sub-scanning direction (a direction orthogonal to the scanning direction of the line image sensor 15) by using a belt 18.
Reference numeral 19 denotes a carrier shaft which guides the movement of the optical unit 14, and reference numeral 20 denotes a transmission light source provided in the document holding cover 12,
Reference numeral 21 denotes a motor provided in the document holding cover 12 for moving the transmission light source 20 in the sub-scanning direction using the belt 22. Reference numeral 23 denotes a motor inside the document holding cover 12. And 24, a carrier shaft for guiding the movement of the transmission light source 20, and 24 a light source power source provided in the document pressing cover 12, for supplying power to the transmission light source 20.

In the conventional image reading apparatus constructed as described above, when a reflection original is placed on the original platen 11, the reflection light source 16 is turned on, and the motor 17 drives the optical unit 14 at a constant speed in the sub-scanning direction. In response to this movement processing, the line image sensor 15 performs processing to read the image information of the reflection original illuminated by the reflection light source 16.

When a transparent original is placed on the original platen 11, the transmission light source 20 is turned on, the motor 17 moves the optical unit 14 in the sub-scanning direction at a constant speed, and in synchronization with this movement. Then, the motor 21 moves the transmission light source 20 in the sub-scanning direction at the same speed, and in response to this movement processing, the line image sensor 15 performs processing to read the image information of the transmission original illuminated by the transmission light source 20. .

[0009]

However, according to such a conventional technique, in order to enable reading of a transparent original, the transmission light source 2 is provided in the original pressing cover 12.
Since the belt 22 and the carrier shaft 23 must be provided in addition to 0, there is a problem that the number of constituent parts increases, so that the entire image reading apparatus becomes large and expensive.

The present invention has been made in view of such circumstances, and has a configuration in which a transparent image placed on a document table is read using a line image sensor. It is an object of the present invention to provide a new image reading device that realizes reading.

[0011]

In order to achieve the above object, according to the present invention, a package is mounted inside a housing having a platen on an upper surface.
An optical unit for providing the line image sensors, magnetic <br/> and a document cover body interior over the light source to be provided to secure the document placed on the document platen, an optical unit By moving in the direction (sub-scanning direction) perpendicular to the scanning direction of the line image sensor while facing the transmission light source,
In images reader that reads the transparently document placed on the platen, provided in the interior of the original lid, a rack extending in a direction perpendicular to the scanning direction of the line image sensor, Toru <br/> It provided in unit to mount the over-light source, mounting a motor, a transmission light source having a pinion meshing with the rack
Provided in units, the unibody inside the document cover body
A slider member which enables smooth movement of Tsu bets, Toru
The rack is sandwiched between the pinion and the over-light source mounting unit.
In Mukoto, configured to include a guide member for holding the engagement between the pinion and the rack.

Here, the rack is provided at a substantially central position on the inner upper surface of the document cover or on a diffusion plate of the document cover. In addition, a unit for mounting the transmission light source is formed of a molding material, and the slider member and the guide member are formed in an integral structure. In addition, this unit has a socket for the transmission light source and a focusing of light emitted from the transmission light source. The unit that mounts the transmitted light source and adopts a configuration that forms the reflector to be integrated with the integrated structure,
In some cases, a printed circuit board is used as a base.

[0013]

According to the present invention, when the motor provided in the unit for mounting the transmission light source rotates, the pinion of the motor moves in the sub-scanning direction while using the rack formed inside the document cover as a guide rail. According to this movement process, the unit for mounting the transmission light source moves in the sub-scanning direction while sliding with the slider member. At this time, the guide member realizes the engagement between the pinion and the rack by the sandwiching structure with the pinion.

According to this movement process, the transmission light source moves in the sub-scanning direction while facing the optical unit, so that reading of the transmission original by the line image sensor of the optical unit is realized.

As described above, according to the present invention, the transmission light source can be moved without providing a belt or a carrier shaft for moving the transmission light source inside the document cover as in the prior art. Thus, the reading of the transparent original can be realized according to a smaller number of parts than in the prior art.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to embodiments. FIG. 1 shows an embodiment of an image processing apparatus provided with the present invention. In the figure, the same components as those described in FIG. 6 are indicated by the same symbols.

Reference numeral 25 denotes a rack provided on the inner upper surface of the document pressing cover 12, which is provided at a substantially central position of the document pressing cover 12 and has a rail having tooth grooves in the sub-scanning direction. This rack 25 is formed integrally with the document pressing cover 12 when the document pressing cover 12 is made of a molding material such as resin.
Reference numeral 26 denotes a self-propelled transmission unit on which the transmission light source 20 is mounted.

As can be seen from this figure, it is not necessary to provide the belt 22 and the carrier shaft 23 shown in FIG. 6 on the original cover 12 of the image processing apparatus of the present invention. FIG.
FIG. 2 is a sectional view of the image reading apparatus of the present invention shown in FIG. 1 when cut along a plane perpendicular to the sub-scanning direction.

In the figure, reference numeral 28 denotes a pinion provided on the rotating shaft of the motor 27, which meshes with the rack 25,
A device for converting the rotation operation of the motor 20 into a reciprocating operation on the rack 25. Reference numeral 29 denotes two guides protruding from the upper surface of the self-propelled transmission unit 26. The one that holds the engagement with the rack 25 and the four sliders 30 provided at both ends on the lower surface of the self-propelled transmission unit 26 enable the self-propelled transmission unit 26 to move smoothly. .

Reference numerals 31 denote slide plates formed at both ends of the diffusion plate 13, which are formed in the sub-scanning direction and serve as slide surfaces of the slider 30, and 32 denotes a rotation fulcrum provided on the housing 10. Reference numeral 33 denotes an elliptical hole provided in the document holding cover 12, and the opening and closing operation of the document holding cover 12 is realized by inserting a rotation fulcrum 32. . here,
The reason why the oval hole 33 is formed as an oval rather than a circle is to provide play so that the document table 11 and the diffusion plate 13 can securely sandwich the document.

Thus, the self-propelled transmission unit 26
As shown in FIG. 3, a transmission light source 20, a motor 27 having a pinion 28 meshing with a rack 25 on a rotation axis, a slider 30 for sliding a slide plate 31,
The configuration includes a guide 29 for holding the pinion 28 and the rack 25 in mesh with each other.

Self-propelled transmission unit 26 having this configuration
Can be integrally manufactured by using a molding material such as a resin. When such a manufacturing method is adopted, the socket of the transmission light source 20 can be integrally formed. As shown in (1), if the reflector 34 for converging the light emitted from the transmission light source 20 is also integrally formed, the number of parts can be further reduced.

Next, the operation processing of the image reading apparatus of the present invention configured as described above will be described. In the image reading apparatus of the present invention configured as described above, the reflection document is placed on the document table 1.
1, the reflection light source 16 is turned on, the motor 17 moves the optical unit 14 at a constant speed in the sub-scanning direction, and the line image sensor 15 is Processing is performed to read the image information of the illuminated reflection original.

On the other hand, when a transparent original is placed on the original platen 11, the transmission light source 20 is turned on, the motor 17 moves the optical unit 14 at a constant speed in the sub-scanning direction, and in synchronization with this movement. By driving the motor 27,
The self-propelled transmission unit 26 moves in the sub-scanning direction at the same speed as the optical unit 14 while using the rack 25 as a guide rail.

That is, when the motor 27 is driven,
The pinion 28 of the motor 27 receives the pressure from the guide 29 and moves in the sub-scanning direction while using the rack 25 as a guide rail. According to this moving process, the self-propelled transmission unit 26 slides on the slider 30 while sliding. It moves in the sub-scanning direction.

According to the moving process, the transmitted light source 20
Since the line image sensor 15 moves in the sub-scanning direction while facing the optical unit 14, the line image sensor 15 performs processing to read image information of a transmission original illuminated by the transmission light source 20.

In this manner, according to the present invention, as in the prior art, reading of a transparent original can be realized without providing a belt or a carrier shaft for moving the transmission light source 20 inside the original pressing cover 12. Become like

FIG. 5 shows another embodiment of the image reading apparatus provided with the present invention. In this embodiment, the configuration of the self-propelled transmission unit 26 that realizes simplification of wiring is provided by directly attaching the motor 27 and the transmission light source 20 to the printed circuit board 35 using the printed circuit board 35 as a base. I have.

In order to realize this configuration, the opaque printed circuit board 35 is disposed on the upper surface side of the document pressing cover 12, so that the rack 25 is provided on the diffusion plate 13. become. In this embodiment,
While using the socket 36 of the transmission light source 20 as the slider 30 on one side, a stopper 37 provided to define the position of the printed circuit board 35 on the upper surface of the rack 25 is provided.
It is used as the slider 30 on the other side.

Although the illustrated embodiment has been described, the present invention is not limited to this. For example, in the embodiment shown in FIG. 1, the configuration in which the rack 25 is provided at the approximate center position of the document pressing cover 12 to reduce the load on the motor 27 is disclosed, but the present invention is not limited to this. Absent. Further, in the embodiments, the present invention has been disclosed in accordance with the image reading apparatus for reading both the transparent original and the reflective original. However, the present invention is not limited to this. It may be.

[0031]

As described above, according to the present invention,
When adopting a configuration in which a transparent original placed on a platen is read using a line image sensor, reading of a transparent original can be realized according to a smaller number of parts than in the related art.

[Brief description of the drawings]

FIG. 1 is an embodiment of the present invention.

FIG. 2 is an embodiment of the present invention.

FIG. 3 is an embodiment of a self-propelled transmission unit.

FIG. 4 is an embodiment of a self-propelled transmission unit.

FIG. 5 is another embodiment of the self-propelled transmission unit.

FIG. 6 is an explanatory diagram of a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Case 11 Document stand 12 Document holding cover 13 Diffusing plate 14 Optical unit 15 Line image sensor 16 Reflection light source 17 Motor 18 Belt 19 Carrier shaft 20 Transmission light source 25 Rack 26 Self-propelled transmission unit 27 Motor

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H04N 1/04 H04N 1/10 H04N 1/00

Claims (5)

(57) [Claims] An electronic device mounted inside a housing having a document table on an upper surface.
An optical unit for providing the line image sensor,
And a document cover body interior a transparently light source that is provided to secure the document placed on the platen, while facing the optical unit and the transparent over the light source, the scanning direction of the line image sensor by moving in a direction perpendicular to the, to the platen
In images reader that read the mounted are transparently document, provided inside of the document cover body, and a rack extending in a direction perpendicular to the scanning direction of the line image sensor, to mount the transparently source provided in the unit, a motor having a pinion meshing with the upper <br/> Symbol rack, provided in the unit, the clamping structure between the upper Symbol pinion, this sandwiching the rack between the pinion
And in, and Turkey and a guide member for holding the engagement between the pinion and the rack, an image reading apparatus according to claim. 2. The image reading apparatus according to claim 1, wherein a rack is provided at a substantially central position on an inner upper surface of the document cover. 3. The image reading apparatus according to claim 1, wherein a rack is provided on an inner lower surface of the document cover. 4. The image reading apparatus according to claim 1, wherein, to constitute a unit for mounting the transmission source in the molding material, thereby forming an integral structure guide member, to the unit, the transmission source An image reading device, comprising: a socket for light transmission; and a reflector for converging light emitted from a transmission light source. 5. The image reading apparatus according to claim 1, wherein the unit for mounting the transmission light source is configured using a printed circuit board as a base.