JP2009206742A - Original holder and image reader - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an original holder which easily performs an operation that arranges and sets a plurality of originals in a small size on a platen, is easily stored and is not damaged while it is stored. <P>SOLUTION: In a holder body (56) provided with original attaching parts (57), such as pockets for holding a plurality of original sheets, the front surface side (55A) of the holder body (56) is formed to be a flat surface of uniform optical characteristics, which covers original sheets placed and set on the platen (3) from the above, and the original attaching parts (57) such as the pockets for holding the plurality of original sheets are formed on the rear surface side (55B). The holder body (56) is configured so as to select the front surface side and a rear surface side to be locked so that the front surface side or the rear surface side of a platen cover (5) of an image reader can be brought into contact with a platen surface. A surface/rear face identification mark SM is formed on at least either the front surface or the rear surface. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a document holder in an image reading apparatus that optically reads an image on a document sheet such as a copying machine, a facsimile machine, and a scanner, and relates to an improvement of a holder mechanism that places and sets a plurality of document sheets on a platen.

  In general, this type of image reading apparatus is widely used in various optical instruments as an apparatus for placing and setting a document on a platen and optically reading the document image with a photoelectric conversion element. The platen is composed of a transparent glass plate or the like on which a document sheet is set stationary.

  Conventionally, when a document is set on this type of platen, a reference plate for forming a step is provided on the periphery of the platen in order to accurately position the original. Normally, a document sheet is placed and set following this reference plate, and then this sheet is covered with a platen cover (document pressing plate). For this reason, the platen cover is attached to the platen glass so as to be freely opened and closed by a hinge or the like, and the document pressing surface in contact with the platen glass is formed of a white plate or the like.

  For example, Patent Document 1 proposes using a document holder when a relatively small document sheet such as a business card, a photograph, or a card is set on such a platen. In the conventional document holder, as disclosed in the same document, a plurality of pockets are arranged in a plurality of upper and lower stages or a plurality of rows on the left and right sides, and a document sheet of a predetermined size is stored in the pockets. For this reason, the pocket for storing the document is formed of a transparent sheet. Patent Document 2 also discloses a similar document holder.

  It is known that by arranging an original sheet on such an original holder and reading an image, a plurality of sheets can be arranged and set on the platen at the same time, and a small-size original or a curled original can be easily set.

Conventionally, this type of document holder is detachably attached to the flange portion of the platen glass as disclosed in Patent Document 1, or separated from the platen or the platen cover as disclosed in Patent Document 2. Either method is used as a sheet.
Japanese Patent Laying-Open No. 2003-78714 (FIG. 1) Japanese Patent Laid-Open No. 10-13607 (FIG. 2)

  As described above, it is known that when a document is set on a platen, a plurality of document sheets are arranged and set on a document holder. Conventionally, when this document holder is stored and used as a sheet separated from the platen or the platen cover (the method described in Patent Document 2), and when this document holder is detachably attached to the flange portion of the platen (described above). The method of Patent Document 1) is known.

  When the former is separated from the former platen, there is a problem that the original holder is lost or is distorted during storage. That is, usually, a standard-size original sheet is set on the platen and image reading is executed, and an original holder is used when reading an image of an irregular small-size original such as a card. In such a case, a problem occurs in storing the document holder.

  Even in the case where the latter document holder is detachably attached to the flange portion of the platen, there are problems that the document holder is lost and the document setting operation is troublesome. That is, in the method disclosed in Patent Document 1, the platen cover is attached to the flange portion of the platen glass by a hinge member so as to be opened and closed, and the document holder is detachably attached to a flange portion different from the cover attachment portion. When using this, the manuscript sheet is mounted separately from the flange mounting portion of the platen, and then the holder is attached to the flange portion, set on the platen, and covered with the platen cover from above. The Therefore, the document setting operation when using the document holder becomes troublesome. On the other hand, when reading an image without using a document holder, the document holder is stored separately from the platen because the setting operation becomes troublesome when the document holder is installed on the flange mounting portion. Will occur.

  As described above, the configuration of the conventional document holder is stored separately from the platen or the platen cover, so there is a problem of loss or loss during storage. Even when using this, the document holder is set on the platen. After that, the set operation is troublesome because it is covered with a platen cover.

  Therefore, the present inventor has solved the problem of storage and disposal when the holder is not used by attaching the original holder to the platen cover integrally. At this time, the original holder is mounted on the platen cover upside down. I came up with the idea to prevent shadows such as pockets from being reflected on the manuscript.

  As described above, when the document holder is integrated with the platen cover, there is a problem in detecting the reading area of the document set on the platen. That is, in a configuration in which the size (area) of the document set during the operation of covering the platen with the platen cover is detected, the size of the document set on the holder cannot be detected. Therefore, the present inventor has come up with a simple structure for determining whether a document is set on a platen or a holder integrated with a cover.

The present invention makes it easy to arrange and set a plurality of small-size originals when setting an original sheet on a platen, and can easily store the originals in the image reading apparatus that does not lose during storage. The main issue is the provision of holders.
Another object of the present invention is to provide a document holder in an image reading apparatus in which shadows such as pockets are not reflected when a fixed-size document that does not use a holder pocket is set and read.

  In order to achieve the above object, according to the present invention, a holder main body (56) having a document mounting portion (57) such as a pocket for holding a plurality of document sheets is mounted on the platen (3) with its front surface side (55A). The set original document sheet is formed on a flat surface having uniform optical characteristics to cover from above, and an original mounting portion (57) such as a pocket for holding a plurality of original sheets is formed on the back surface (55B). The holder main body (56) is configured so that the front or back is selected and locked so that the front or back surface of the platen cover (5) of the image reading apparatus is in contact with the platen surface. A back surface identification mark (SM) is formed. The configuration will be described in detail below.

  A document holder (55) for positioning and setting a plurality of document sheets in a predetermined posture on a platen (3) having a platen cover (5) that can be freely opened and closed, and formed in a shape covering the platen (3) The holder main body (56) and a fastening portion (58) provided on the holder main body (56) and detachably locked to the platen cover (5). The front surface side of the holder main body (56) is formed with a flat surface having uniform optical characteristics covering the original sheet set on the platen (3) from above, and a plurality of original sheets are held on the rear side. A document mounting portion (57) such as a pocket to be formed is formed. Further, the fastening portion (58) is configured to be able to be reversed and locked to the platen cover (5) so that the front surface or the back surface is in contact with the platen surface. Front and back identification means are formed on at least one of the front and back surfaces of the holder body (56).

  The surface side of the holder body (56) is formed of a white material. Further, the front and back identification means is constituted by an optically detectable front and back identification mark (SM). Further, a document area mark for identifying whether or not a document sheet is mounted is formed on the document mounting portion (57) formed on the back side of the holder body (56).

  The document mounting portion (57) forms a plurality of document storage pockets with a white back sheet on the holder body (56) and a transparent sheet attached to the back sheet in a bag shape with a transparent sheet. The document storage pockets are formed in a plurality of upper and lower steps and / or a plurality of left and right rows.

  An image reading apparatus according to the present invention includes a platen (3) for placing and setting an original sheet, an optical reading means (8) for reading an original image on the platen, and a platen for covering the original sheet placed on the platen. A cover (5) and a document holder (55) for positioning and setting a plurality of document sheets on the platen (3) are provided. The document holder (55) includes a sheet-like holder body (56) formed to cover the platen (3), and the platen (3) of the platen cover (5) provided on the holder body (56). ) And a fastening portion (58) that is detachably locked to the contact surface. At this time, the front surface side of the holder main body (56) is formed on a flat surface with uniform optical characteristics covering the original sheet set on the platen (3) from above, and on the back surface side of the holder main body (56). Then, a document mounting portion (57) such as a pocket for holding a plurality of document sheets is formed. The fastening portion (58) is configured to be able to be reversed and locked to the platen cover (5) so that the front or back surface of the holder body (56) contacts the platen surface. Front and back identification marks (SM) are formed on at least one of the front and back surfaces of the main body (56). Therefore, the set information of the original sheet is identified based on the detection signal from the reading sensor (SS) of the front and back identification mark (SM).

  The document sheet set information includes (1) information for determining whether the document set on the platen (3) is a plurality of sheets or a single sheet, and / or (2) an effective reading area of the document. It is information for discriminating.

  The document holder (55) is composed of a plurality of holder bodies (56) having different document sheet sizes, arrangement order, etc., and holder identification marks (HM) are formed on the plurality of holder bodies (56). Therefore, the effective reading area of the original set on the platen (3) is determined based on the detection signal from the reading sensor of the holder identification mark (HM).

  According to the present invention, the holder main body is turned upside down on the platen cover of the image reading apparatus and is detachably locked, and the surface side of the holder main body has a uniform optical characteristic that covers the document sheet placed on the platen from above. It is formed on a flat surface, and a document mounting portion such as a pocket for holding a plurality of document sheets is formed on the back surface thereof, and front and back identification marks are formed on at least one of the front and back surfaces. Play.

  The holder body is fixed integrally with the platen cover when not in use, and the surface (front surface) is formed on a flat surface having uniform optical characteristics (for example, white) covering the document placed on the platen. No shadows are reflected on the screen. In particular, even when the original sheet is a translucent film sheet (OHP sheet or the like), it is not affected by a background such as a shadow.

  Further, since the holder body is held integrally with the platen cover when not in use, there is no risk of loss compared to the conventional case where the holder body is separated and stored, and there is no problem of loss such as distortion during storage. At the same time, when the pocket portion (fastening portion) of the holder main body is not used, an opening / closing operation of placing the document sheet on the platen glass and covering the platen cover with the platen cover as in the normal setting operation is possible. Even when used, the holder body can be set at a predetermined position in a predetermined posture by separating the holder main body from the platen cover and attaching the original sheet to the holder body and then fixing the holder body to the platen cover.

  Further, according to the present invention, the front and back surfaces of the holder body mounted on the platen cover are provided with front and back identification marks on one of them, so that an effective image area can be determined by reading this mark with an image reading device. It is also possible to warn the user of a mistake in mounting the front and back surfaces.

  In this case, when the effective reading area of the original sheet set on the platen is determined, the original sheet placed on the platen is directly detected (at the front surface) based on the detection result of the identification mark, or in advance. It is easy to set the image reading area such that the set area is the effective reading area (in the case of the back side). Similarly, when pre-scanning with the image reading apparatus, it can be easily configured to discriminate and warn that the front and back surfaces of the holder body are not appropriate.

  The present invention will be described in detail below based on the preferred embodiments shown in the drawings. FIG. 1 is a perspective explanatory view showing the entire configuration of an image reading apparatus according to the present invention, and FIG. 2 is a longitudinal explanatory view thereof. FIG. 3 is an explanatory view of a cross section of a main part for feeding a document sheet to the platen.

  The image reading apparatus shown in FIG. 1 includes a scanner unit A and a document transport unit B. The document transport unit B is installed on the scanner unit A. In the scanner unit A, as shown in the drawing, a document traveling platen (hereinafter referred to as “first platen”) 2 and a document fixing platen (hereinafter referred to as “second platen”) 3 are arranged in parallel on the upper surface of an outer casing (housing) 1. Has been placed. The document conveying unit B includes a feeder mechanism 4 that feeds a document sheet to the first platen 2 and a platen cover 5 that covers the document on the second platen. As shown in FIG. It is connected so that it can be opened and closed in 1h. Each configuration will be described in detail below.

[Configuration of scanner unit]
The scanner unit A includes the first platen 2 and the second platen 3 described above in the exterior casing 1, and an image reading mechanism is built in the casing. The image reading mechanism shown in FIG. 2 will be described. Inside the outer casing 1, a carriage 6 that reciprocates along the first and second platens 2, 3, a condenser lens 7, and a photoelectric conversion element (image reading means; The same applies hereinafter) 8 is arranged. The illustrated apparatus irradiates light on a document on a platen from a light source lamp 9 mounted on a carriage 6, guides the reflected light to a condenser lens 7 by a plurality of mirrors 10, and electrically reads the light by a photoelectric conversion element 8. The system is shown. Therefore, the carriage 6 is supported by the guide rail 12 and is configured to reciprocate along the second platen 3. Accordingly, the carriage 6 scans the document set on the second platen 3 in the process of moving along the second platen 3 and reads an image by the photoelectric conversion element (line sensor) 8. At the same time, the carriage 6 moves from the second platen 3 to a position immediately below the first platen 2, and is configured to read an image of a document moving on the first platen 2 at a predetermined speed while still in this position. Yes.

  The reading optical system shown in the figure is a reduction optical system that moves the carriage 6 on which the light source is mounted and fixes the condenser lens 7 and the photoelectric conversion element 8 to the apparatus frame. Needless to say, the optical system may be configured by an equal-magnification optical system that is mounted on a carriage and moves. In this case, a contact sensor in which a light source, a lens, and a photoelectric conversion element are integrated may be used.

[Configuration of Document Feed Unit]
As shown in FIG. 2, the document conveying unit B is disposed above the first and second platens 2 and 3 so as to cover the first and second platens 2 and 3. A guide member 21 and a carry-out roller 22 for scooping up an original sheet from one platen 2 are provided. Further, on the upstream side of the read roller 20, a paper feed stacker 23 for stacking and storing original sheets, a paper feed roller 24 for stacking and feeding the sheets one by one on the paper feed stacker 23, and a separate feed. A pair of registration rollers 25 for correcting the skew of the leading edge of the sheet is disposed. 26 is a paper feed path for guiding a document sheet from the paper feed stacker 23 to the first platen 2, and S1 is a lead sensor for detecting the leading edge of the document reaching the platen.

  In the illustrated apparatus, a backup roller 27 for guiding a document sheet is disposed above the first platen 2. This backup roller 27 rotates at the same peripheral speed as the lead roller 20 so as to fit the original sheet on the first platen 2. A backup guide may be arranged above the platen without providing the backup roller 27.

  A paper discharge roller 28 and a paper discharge stacker 29 are disposed on the downstream side of the carry-out roller 22. As shown in FIG. 2, the paper discharge stacker 29 is arranged vertically below the paper feed stacker 23, and a platen cover 5 for pressing and supporting the original sheet on the second platen 3 is provided at the bottom. Yes.

  The document transport unit B configured as described above is installed on the upper housing (exterior casing) 1 of the scanner unit A so as to be freely opened and closed by a hinge member 1h (see FIG. 1). The document sheet is placed and set with the second platen 3 opened, and the document is covered with the platen cover 5 of the document transport unit B. On the other hand, the frame of the document transport unit B is attached to the first platen 2 so that the distance (document transport gap) between the first platen 2 and the backup roller (or backup guide) 27 does not change when the document transport unit B is opened and closed. A positioning protrusion (stopper member; not shown) is provided.

[Configuration of the second platen]
Therefore, the above-described second platen 3 will be described. The second platen 3 (hereinafter simply referred to as “platen 3”) is configured by attaching a transparent plate such as glass to the upper plane of the outer casing 1. The platen 3 is normally formed on a flat surface, and is configured such that a sheet document or a book document is placed on the upper surface (platen surface) 3a. The platen 3 is formed in a shape (area) on which the maximum original sheet can be placed, and a positioning member (hereinafter referred to as “original scale”) 3S is provided at the edge. The document scale 3S is disposed on at least one side of the platen 3, and is formed with a stepped surface that abuts and regulates the edge of the document. As shown in FIG. 1, the illustrated apparatus is provided with document scales 3 </ b> S on the two sides of the platen 3 on the X and Y sides shown in the drawing.

“Configuration of the platen cover”
The platen 3 described above is provided with a platen cover 5 that holds the placed document so as to optically cover it. The platen cover 5 is installed on the flange portion of the platen 3 so as to be openable and closable. With the platen cover 5 open, a document sheet is placed on the platen and then pressed and held so as to cover the document sheet from above. Therefore, the platen cover 5 includes a pressing plate 51 that covers substantially the entire platen 3, an elastic pad 52 that backs up the pressing plate 51, and a base frame 53. As shown in FIG. 2, the illustrated base frame 53 is formed of a bottom plate that forms the paper discharge stacker 29 described above. The base frame 53 is made of synthetic resin and has an appropriate mechanical strength, and is attached to the platen 3 so as to be openable and closable by the hinge member 1h (see FIG. 1). A pressing plate 51 is attached to the base frame 53 via an elastic pad 52 such as sponge or soft rubber. The illustrated pressing plate 51 is formed of a film-like resin plate and is colored white.

[Document Holder Configuration]
The present invention is characterized in that the following document holder 55 is detachably attached to the platen cover 5 described above. The document holder 55 has the following configuration for placing and setting a small-size document such as a card on the platen 3 described above. The document holder 55 is configured, for example, in a JIS standard A4 size or A3 size sheet shape, and a sheet-like holder body 56 that covers the platen 3 and a document such as a pocket that is provided in the holder body 56 and holds a plurality of document sheets. The mounting portion 57 and a fastening portion 58 that is detachably locked to the platen contact surface of the platen cover 5 are configured.

  The holder body 56 is provided with a document mounting portion 57. As shown in FIG. 4B, the holder main body 56 is composed of a back plate 56a and a transparent front plate 56b superimposed on the plate, and the two superimposed plates are stitched (for example, heat welding seam), As shown in FIG. 4A, a document mounting portion 57 formed of a plurality of pockets P1, P2,... Pn is formed. Each pocket is provided with an opening 56c for inserting a document sheet. Therefore, a small document such as a card is inserted and held in the plurality of document mounting portions 57 formed.

  The surface 55A of the back plate 56a shown in FIG. 5A is formed on a flat surface having uniform optical characteristics, and is formed in white that is substantially the same as the original color. Therefore, if the front surface side 55A is attached to the platen cover 5 so as to contact the platen surface 3a, the document sheet placed on the platen 3 is covered from above, and shadows and the like are not reflected on the read image. Further, if the back surface side 55B provided with the document mounting portion (pocket P) 57 is attached to the platen cover 5 so as to contact the platen surface 3a, the document sheet inserted into the pocket can be set on the platen 3. .

  The above-mentioned holder main body 56 is provided with a fastening portion 58 that is detachably attached to the platen cover 5. The fixing portion 58 is configured to be able to be fixed by reversing the front and back so that the front surface side 55A contacts the platen surface 3a or the back surface side 55B contacts the platen surface 3a. The fastening portion 58 shown in the figure is provided with locking claws 58 a on four sides of the pressing plate 51 of the platen cover 5. As shown in FIG. 4C, the locking claw 58a is formed of a claw piece provided on the pressing plate 51 of the platen cover 5, and is elastically deformed by the action of the elastic pad 52 described above, thereby back of the holder main body 56. The plate 56a is clamped and supported. Therefore, the engagement claw 58a is selectively selected from the state shown in FIG. 5A where the front side 55A of the document holder 55 abuts against the platen surface 3a and the state shown in FIG. 5B where the back side 55B abuts. It becomes possible to attach to.

  As described above, the present invention is characterized in that the original holder 55 is selected on the front and back of the pressing plate 51 of the platen cover 5 and is detachably mounted. This is because when a special document such as a card is mounted on the document holder 55 and an image is read (hereinafter referred to as “special document reading”), the pressing plate is arranged so that the back side 55B of the document holder 55 comes into contact with the platen surface 3a. Fasten to 51. Further, when an ordinary document such as a standard size sheet is placed on the platen 3 to read an image (hereinafter referred to as “ordinary document reading”), the surface side 55A of the document holder 55 is pressed so as to contact the platen surface 3a. Secure to the plate 51.

  By fixing the document holder 55 to the platen cover 5 in this way, it becomes possible to solve the storage of the document holder 55 and the problem of loss such as bending during storage. In this case, when reading a normal document, the surface side 55A of the document holder 55 faces the platen surface 3a in the state shown in FIG. In the case of reading a special document, the back side 55B of the document holder 55 faces the platen surface 3a in the state shown in FIG. Accordingly, when reading a normal document, the surface side 55A of the document holder 55 presses the document sheet placed and set on the platen 3, and the surface side 55A is an optically uniform flat surface (for example, a white flat surface). Because it is composed of, shadows etc. will not be reflected. In the case of reading a special document, a document sheet is mounted on a document mounting portion 57 such as a pocket P formed on the back surface 55B of the document holder 55, and the cover is covered with the document holder 55 fixed to the platen cover 5. When closed (closed), the platen surface 3a is set.

[Original Size Detection]
In the configuration of the platen cover 5 configured as described above, the size detection of an original for reading an image is configured as follows. This document size detection is used to set an effective reading area when the image reading means 8 reads an image. Hereinafter, “effective reading area setting in normal document reading” and “effective reading area setting in special document reading” will be described in this order.

“Effective reading area setting for normal document scanning”
The second platen 3 is provided with a size detection sensor SS that detects the size of the placed document, and a size determination unit (not shown) that determines the document size based on a signal from the size detection sensor SS. As shown in FIG. 6A, the size detection sensor SS is arranged below the platen 3 in the outer casing 1 and is configured to detect an edge of a document placed and set on the upper platen 3. Yes. The illustrated size detection sensor SS is constituted by, for example, a plurality of sensor arrays so as to detect a document having a predetermined standard size. A size detection sensor SS is disposed so as to detect the document edge in the sub-scanning direction (FIG. 6 (a) left-right direction) of the platen 3 with the document scale 3S as a base point.

  Further, although the above-described size discrimination means is not shown, for example, the control CPU of the image reading apparatus is configured as follows. The platen cover 5 is provided with an opening / closing sensor 55 for detecting the opening / closing movement as shown in FIG. The open / close sensor 55 detects the state in which the platen cover 5 covers the second platen 3. Therefore, the control CPU executes the document size discrimination from the detection signal of the size detection sensor SS immediately before (the document is covered with the platen cover) by the ON signal of the open / close sensor 55. This is because, when the size detection sensor SS detects the length position in the sub-scanning direction of the document placed on the platen, the document is covered with the platen cover 5 and then the document is the same color on the surface side of the document holder 55. It is covered with 55A and the edge detection becomes impossible. Thus, the detection signal of the size detection sensor SS is stored, and the platen cover 5 is closed, and the document size is determined based on the detection signal stored immediately before by the ON signal from the open / close sensor 55.

"Effective reading area setting for special document scanning"
In the configuration of the size discriminating means as described above, the following problem occurs when the document holder 55 with the document sheet mounted on the platen cover 5 is fixed. That is, when the platen cover 5 is closed, there is no document sheet on the platen 3, and it is impossible to detect the document edge by the size detection sensor SS. Therefore, the following “front / back surface identification mark SM” and “original area mark AM” are provided on the original holder 55.

  The front / back surface identification mark SM is disposed on the platen cover 5 as front / back surface identification means for determining whether the document holder 55 faces the platen surface 3a so that the front surface side 55A faces the back surface side 55B. . The front / back surface identification mark SM is formed of an optically detectable mark, and a front / back surface detection sensor St (see FIG. 6B) for determining the identification mark SM is provided on the platen 3 side. Accordingly, it is possible to determine whether the document holder 55 is in contact with the platen cover 5 and whether the front surface side 55A contacts the platen surface 3a or the back surface side 55B. Therefore, the above-described size discriminating means is operated by a detection signal from the front / back detection sensor St. That is, when the front side 55A of the document holder 55 faces the platen, the above-described “effective reading area setting in normal document reading” is executed.

  Therefore, the effective reading area for special document reading is set by one of the following methods. In the first method, the size of the document holder 55 is set in advance, and when the back side 55B comes into contact with the platen surface 3a by the front and back detection sensor St, the preset size is set as an effective reading area. In the second method, a document area mark AM is applied to the document mounting portion 57 of the document holder 55, and this area mark is read, for example, when the image reading means 8 is pre-scanned to set an effective reading area. For this reason, as shown in FIG. 4A, the document holder 55 is provided with document area marks AM1... AMn that can be detected optically in a plurality of pockets P, and these area marks AM are placed in the pockets in the document sheet. When the document sheet is stored, it is concealed, and when there is no document sheet, it is exposed.

  Accordingly, by detecting the document area mark AM provided in the pocket P by the optical reading means 8, it is possible to recognize in which pocket P the document sheet is present. That is, when original sheets are accommodated in the original area marks AM1 to AM3 shown in FIG. 4A, when original sheets are accommodated in the original area marks AM1 to AM6, and originals are included in the original area marks AM1 to AM9. The scanning area of the image reading unit 8 can be made different depending on whether the sheet is accommodated.

[Different Embodiments of Document Holder]
Although the document holder 55 described above is composed of a single sheet, FIG. 7 shows a case where the document holder 55 is composed of a plurality of sheets. FIG. 4A illustrates the case where the pockets P are formed in the upper and lower four stages, and FIG. 5B illustrates the case where the pockets P are formed in the upper and lower five stages and the left and right 25 rows. is doing. These document holders 55 are formed with fastening portions 58 similar to those described above, and are latched and supported by latching claws 58 a formed on the platen cover 5.

  A holder identification mark HM is provided at the edge of each document holder 55. By detecting this mark with a holder determination sensor (not shown), it is possible to determine the document storage pattern of the document holder 55 mounted on the platen cover 5. As described above, the document holder 55 is provided with the front / back surface identification mark SM for identifying the front and back surfaces and the holder identification mark HM for identifying the holder sheet having a different document mounting pattern. Therefore, the effective reading area is determined based on the signal from the sensor that detects the holder identification mark HM.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 2 is a longitudinal explanatory view of the apparatus of FIG. 1. Sectional explanatory drawing of the principal part which feeds an original sheet to a platen. 2A and 2B are configuration explanatory views of a document holder according to the present invention, in which FIG. 1A is a plan view, FIG. 2B is a cross-sectional shape, and FIG. 3C is a ZZ cross section shown in FIG. 5A and 5B are explanatory views of a cross-sectional configuration of the document holder of FIG. 4, in which FIG. 4A shows a state in which the holder surface faces the platen, and FIG. 5B shows a state in which the holder back surface faces the platen. 2A and 2B are explanatory diagrams of a state where an original is set on a platen in the apparatus of FIG. 1, where FIG. Explanatory drawing which shows each different form of the document holder concerning this invention.

Explanation of symbols

3 Second platen 3a Platen surface 3S Positioning member (original scale)
5 Platen cover 8 Image reading means 51 Press plate 52 Elastic pad 53 Base frame 55 Document holder 55A Front side 55B Back side 56 Holder body 56a Back plate 56b Front plate 56c Opening 57 Document mounting part 58 Fastening part P1, P2. Pn Pocket AM Document area mark SM Front / back identification mark HM Holder identification mark SS Size detection sensor St Front / back detection sensor A Scanner unit

Claims (8)

A document holder for positioning and setting a plurality of document sheets in a predetermined posture on a platen provided with a platen cover that can be freely opened and closed,
A sheet-like holder body formed in a shape covering the platen;
A fastening portion provided in the holder body and detachably locked to the platen cover;
And consists of
The front surface side of the holder body is formed on a flat surface with uniform optical characteristics that covers the original sheet set on the platen from above,
On the back side of the holder body, a document mounting portion such as a pocket for holding a plurality of document sheets is formed,
The fastening portion is configured to be able to be reversed and locked to the platen cover so that the front surface or the back surface is in contact with the platen surface,
A document holder in an image reading apparatus, wherein at least one of front and back surfaces of the holder body is formed with front and back surface identification means. The document holder in the image reading apparatus according to claim 1, wherein a surface side of the holder main body is formed of a white material. The document holder according to claim 1, wherein the front / back surface identification means is an optically detectable front / back surface identification mark. 2. The image reading apparatus according to claim 1, wherein a document area mark for identifying whether or not a document sheet is mounted is formed on a document mounting portion formed on the back side of the holder body. Document holder in. The document mounting portion is composed of a plurality of document storage pockets,
The holder body is composed of a white back sheet and a transparent sheet attached to the back sheet in a bag shape with a transparent sheet,
2. The document holder according to claim 1, wherein the document storage pocket is formed in a plurality of upper and lower stages and / or a plurality of left and right rows. A platen on which a document sheet is placed and set;
Optical reading means for reading a document image on the platen;
A platen cover that covers a document sheet placed on the platen;
A document holder for positioning and setting a plurality of document sheets on the platen;
With
The document holder is
A sheet-like holder body formed in a shape covering the platen;
A fastening portion provided in the holder body and detachably locked to a platen contact surface of the platen cover;
Consisting of
The front surface side of the holder body is formed on a flat surface with uniform optical characteristics that covers the original sheet set on the platen from above,
On the back side of the holder body, a document mounting portion such as a pocket for holding a plurality of document sheets is formed,
The fastening portion is configured to be able to be reversed and locked to the platen cover so that the front or back surface of the holder main body is in contact with the platen surface,
Front and back identification marks are formed on at least one of the front and back surfaces of the holder body,
An image reading apparatus for identifying set information of an original sheet based on a detection signal from a reading sensor for the front and back identification marks. The document sheet set information is:
(1) Information for determining whether a document set on the platen is a plurality of sheets or a single sheet, and / or (2) Information for determining an effective reading area of the document. The image reading apparatus according to claim 6. The document holder is composed of a plurality of holder bodies having different document sheet sizes, arrangement orders, and the like.
A holder identification mark is formed on the plurality of holder bodies,
7. The image reading apparatus according to claim 6, wherein an effective reading area of a document set on a platen is determined based on a detection signal from a reading sensor for the holder identification mark.

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