JP2878948B2 - Document 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 a document reading apparatus,
In particular, the present invention relates to a document reading apparatus capable of reading various types of documents such as a cassette type document.

Most of the originals to be read by the original reading apparatus represent black and white images on paper (cut sheets). In recent years, originals in the form of film or originals (color images) (In the case of a document reading apparatus) is often read.

[0003]

2. Description of the Related Art Document reading methods in a document reading apparatus are roughly classified into two types: a fixed document type and a movable document type.

In the reading method for a fixed original, the originals are placed (fixed) one by one on a platen glass (for a fixed original).
It is a method to do. Document supply and alignment in this method are performed manually. Therefore, manual reading is required without manual intervention, but there is no damage because the document does not come into contact with rollers or the like.

The method of reading a moving document is a method of automatically moving a plurality of documents stacked on a hopper onto a platen glass (for a moving document) in sequence. Document supply and alignment in this manner are performed automatically. Therefore, although the supply of the original does not need to be performed manually, the original may be damaged by contact with the rollers or the like.

When the original to be read is a film or a color original, it does not matter which method is used, but it is often difficult to recover this type of original when it is damaged. Is usually based on a reading method for fixed originals.

[0007]

As described above, when a fixed original is used for a film or a color original,
The document is not damaged, but the supply of the document must be performed manually, which is troublesome.

Therefore, it is conceivable that a plurality of films or the like are placed on a hopper with a cassette or a thick sheet interposed therebetween, and the cassettes and the like are automatically moved on a platen glass in order and read. According to this method, the supply of the film or the like does not need to be performed manually, and the film or the like is not damaged.

However, according to the study of the present inventor,
It has been found that this method has the following problems. That is, when focusing on the state of the film or the like placed on the platen glass for reading, the surface to be read of the film or the like is separated from the contact surface of the platen glass by the thickness of the cassette or the like. . On the other hand, the focus at the time of reading is on the surface of the platen glass. Therefore, the surface to be read, such as a film, is shifted from the focal point by the thickness of the cassette or the like.
For this reason, it is impossible to faithfully read a document such as a film.

An object of the present invention is to provide an original reading apparatus capable of reading various forms of an original such as a cassette type original. Another object of the present invention is to provide a document reading apparatus capable of correcting an optical path and reading a document faithfully when a cassette type document or the like is read by a reading method for a moving document.

[0011]

FIG. 1 is a block diagram showing the principle of the present invention, and shows a main part of a document reading apparatus according to the present invention. An original reading apparatus shown in FIG. 1 includes an original and a cassette 1 sandwiching the original.
A document reading device for automatically feeding the document 4 to a predetermined moving document reading position and reading the document when the document is supplied to a predetermined moving document reading position. The optical path 1 (indicated by a dotted line in the figure) is an optical path for reading the cassette 14 sandwiching the original when the cassette 14 is supplied to a predetermined reading position for a movable original, and is different from the first optical path 1. A second optical path 2 (shown by a solid line in the figure);
A second optical path having a predetermined refractive index and being inserted into the second optical path 2 and correcting the apparent optical path length of the second optical path 2 to be equal to the apparent optical path length of the first optical path 1. And an optical path length correction block 42 (4).

[0012]

The document reading device reads a document along the first optical path. Therefore, the apparent optical path length of the first optical path 1 is set to a.

The document reading device reads a document in the cassette 14 through the second optical path 2. An optical path length correction block 42 (4) for the second optical path is inserted into the second optical path 2. Therefore, the apparent optical path length of the second optical path 2 is:

[0014]

(Equation 1)

## EQU1 ## Here, t ₁ is the cassette 14
Transparent body of the document holding portion 142, 143 (141) thickness, t ₂ is the thickness of the optical path length correction block 42. n ₁
And n ₂ are the refractive index of the transparent body (141) and the optical path length correction block 42, respectively.

Equation (1) indicates that the apparent length of the optical path is different from the geometrical length of the light wave with respect to the material on the optical path (transparent body (141), optical path length correction block). 42)
Utilizing the fact that it varies depending on the refractive index.

Here, since t ₁ , t ₂ and n can be determined in advance, for example, it is assumed that n ₁ = n _{2 、} n, and the relation between them is

[0018]

(Equation 2)

## EQU1 ## Thereby, the first optical path 1 and the second optical path 1
The apparent optical path length of the optical path 2 can be made equal.
Thus, the apparent optical path length of the second optical path 2 is “a”. On the other hand, the focus at the time of reading matches the first optical path 1, that is, the optical path length a. Therefore, in the case of using the second optical path 2, even if the transparent body (141) of the cassette 14 is in the optical path, it is possible to focus the reading on the original in the cassette 14 and read it faithfully.

[0020]

FIG. 2 is an explanatory view of an embodiment, showing a document reading apparatus. The document reading apparatus shown in FIG. 2 has a moving document reading function of automatically feeding a document and a cassette 14 sandwiching the document to a predetermined reading position for moving document (on the platen glass 11) by a paper feeding system to read the moving document. And a fixed document reading function for reading a fixed document previously placed at a predetermined fixed document reading position (on the platen glass 12). The document reading apparatus shown in FIG. 2 transmits light from the light source 18 through the document (located on the platen glass 11) to read the document, and transmits light from the light source (not shown) to the document (not shown). A reflection reading function of reading the original by reflecting the original on the original (located on the platen glass 12).

The moving document is automatically fed by the feeding system. The hopper 13 places a document (cut sheet) for automatic paper feeding or a cassette 14 (hereinafter, referred to as a cassette 14 or the like) sandwiching the document thereon. The upper surface of the loaded cassette 14 or the like is, as shown in FIG.
Is abutted. Therefore, the bottom surface 13 of the hopper 13
One (compression coil) spring 132 is provided below.

Whether an object to be supplied is a document or a cassette 14 is specified by, for example, an operator's switch input from an operation panel (not shown). The pick roller 1
An optical sensor may be provided in the vicinity of 5 to detect whether the original and the cassette 14 are different. In this case, the optical sensor detects the supply of the cassette 14 because its optical path is blocked by the thickness of the cassette 14.

The pick roller 15 picks one cassette 14 or the like on the hopper 13 and conveys it to the feed roller 16 side. The feed roller 16 comprises a pair of upper and lower rollers, between which the cassette 1 from the pick roller 15 is fed.
4 and the like are fed onto the platen glass 11 and further conveyed to the discharge roller 17. At this time, the cassette 14 and the like move according to the paper guide 19.

The platen glass 11 determines a reading position for a moving original. The cassette 14 and the like are read while being placed on the platen glass 11. The discharge roller 17 is composed of a pair of upper and lower rollers. The discharge roller 17 holds the cassette 14 and the like between the rollers and transports the cassette 14 from above the platen glass 11 to the outside of the apparatus. Also at this time, the cassette 14 and the like move according to the paper guide 19. Note that the cassette 14 and the like on the platen glass 11 after reading are pushed by the subsequent cassette 14 and the like supplied from the feed roller 16 and reach below the discharge roller 17.

Here, the cassette 14 shown in FIGS.
Will be described. FIG. 4 is a side view of the cassette 14 of FIG. 3 as viewed from the direction of arrow X in the figure. Cassette 14
As shown in FIG. 4, there are two upper and lower flat plate-shaped document holding portions 142 and 143 which are openable and closable on one side thereof and connected at the left end in the drawing. As shown in FIG. 3, the document holding units 142 and 143 are formed of rectangular plates, and hold the document tightly between them. The held document is, for example, a film, a color document, or the like.

Document holders 142 and 143 of cassette 14
Have the same thickness t at substantially the center thereof as shown in FIG.₁
Of the transparent body 141. The transparent body 141 transmits the original.
For reading, the light from the light source 18
Transparent and has a predetermined refractive index n ₁Having.

Document holders 142 and 143 of cassette 14
As shown in FIG. 3, the width of each pair of rollers 15, 1
It is slightly smaller than the outer dimensions of 6 and 17. Thereby, the supply of the cassette 14 can be sent straight in the movement direction.

As shown in FIG. 3, the width of the transparent body 141 is made slightly smaller than the interval between the pair of rollers 15, 16 and 17 on the left and right so that the rollers 15 to 17 are not touched. Thus, when the cassette 14 is supplied, the transparent member 141 is supplied.
Can be prevented from being contaminated by the rollers 15, 16 and 17, thereby preventing transmission reading from being obstructed.

Document holders 142 and 143 of cassette 14
Is made of plastic, for example, and the transparent body 141 is made of a transparent thin plate made of, for example, hard acrylic. Cassette 1
The thickness of 4 is, for example, about 3 mm. It is preferable that the cassette 14 is not allowed to be bent or the like in order to protect the original inside.

Here, the supply of the cassette 14 and the like will be further described with reference to FIG. The feed roller 16 is shown in FIG.
As can be seen from FIG. 3 and FIG. 3, a total of four feed rollers are provided in the upper, lower, left and right directions.
A color roller 161 is provided on the inner side (shown in FIG. 5) by projecting this. Similarly, a color roller 171 is provided for the discharge roller 17.

Color roller 161 and color roller 171
And a paper guide 19 is provided between them. The paper guide 19 is bent such that both ends 191 and 192 are substantially semicircular as shown in FIG. 5 so as to substantially follow the color rollers 161 and 171. Thus, the paper guide 19 is fixed and held by the color rollers 161 and 171 and follows the movement of the color rollers 161 and 171.

As shown in FIG. 5, an area 193 of the paper guide 19 under the light source (lamp) 18 is opened so that the entire area of the transparent body 141 can directly receive the light from the light source 18, for example. You. Note that the light source 18 is fixed to a socket 194 provided in a part of the paper guide 19.

The lower 2 of the four feed rollers 16
The individual is fixed, for example, to the housing 20 of the device (see FIG. 2). On the other hand, the upper two rollers of the feed roller 16 are fixed to the housing 20 of the apparatus via a (compression coil) spring 162. The same applies to the discharge roller 17.

When the cassette 14 is sent from the pick roller 15, the upper feed roller 16
, And the spring 162 absorbs it. Therefore, the cassette 14 has the feed roller 16
, And are conveyed.

At this time, the right end 191 of the paper guide 19 also rises as the color roller 161 rises. Thereby, the cassette 14 is easily transported along the paper guide 19.

Further, as the cassette 14 is transported, the left end 192 of the paper guide 19 rises.
The color roller 171 also rises, and the spring 172 absorbs this. As a result, the cassette 14 can easily be mounted on the discharge roller 1.
7 and is conveyed.

When a document (cut sheet) is conveyed, the upper rollers of the rollers 16 and 17 are not pushed up, and their weights and springs 162 and 17 are not pushed up.
2. The original is tightly clamped by the force determined by (2).

The moving original which is automatically fed as described above is transmitted and read by the first optical path 1 and the second optical path 2 shown in FIGS. Imaging device (CCD)
Reference numeral 5 denotes a cassette 1 on the upper surface of the platen glass 11 via the lens system 6, mirrors 7, 8 and 9, and the platen glass 11.
4 is read. For this reading, a light source 18 is provided above the platen glass 11 and illuminates the back side of the cassette 14 and the like. The CCD 5 reads light transmitted through the cassette 14 and the like.

The mirrors 7, 8 and 9 respectively assume a first position indicated by a dotted line in the drawing and a second position indicated by a solid line in the drawing.
The first position and the second position are positions when the first optical path 1 and the second optical path 2 are configured, respectively.

Which of the first optical path 1 and the second optical path 2 is to be constituted is instructed, for example, by an operator's switch input from an operation panel. That is, an instruction input indicating whether the supplied object is a document or a cassette 14 is an instruction signal of the optical path configuration. Therefore, the cassette 14 may be detected by a sensor and used as the instruction signal.

As shown by a dotted line in FIG. 1, the first optical path 1 passes through the lens system 6 from the upper surface of the platen glass 11 via mirrors 9, 8 and 7 at the first position, and passes through the CC.
D5 and up to these elements. First
Is an optical path for reading an original (cut sheet) when it is supplied.

As shown by the solid line in FIG. 1, the second optical path 2 takes into account the thickness t ₁ of the document holding portion 142 or 143 (preferably 143) of the cassette 14 and
3 through the platen glass 11 from the upper surface (the inner surface) of the (transparent body 141), the mirrors 9, 8 and 7 at the second position.
Through the optical path length correction block 42 having a thickness t ₂ between the mirrors 8 and 7, the lens system 6, and the CCD 5.
Up to and composed of these elements. The second optical path 2 is an optical path for reading a document held in the cassette 14 when the cassette 14 is supplied.

The apparent optical path length "a" of the first optical path 1 is the length that has been traced from the upper surface of the platen glass 11 to the CCD 5 as described above. The apparent optical path length of the second optical path 2 is, as described above, a length that travels from the upper surface of the document holding unit 143 to the CCD 5, and is expressed by Expression (1) using a.

Here, the transparent body 141 of the document holding unit 143
By selecting the refractive index n ₁ of the refractive index n ₂ of the optical path length correction block 42 to be equal to, the thickness t ₁ (transparent body 141 of the transparent body 141 so as to satisfy the relationship of formula (2) with a thickness equal t ₁ and the document holding portion 143) and setting the thickness t ₂ of the optical path length correction block 42, the optical path length of the second optical path 2 apparent that "a" be able to.

The optical path length correction block 42 is inserted into the housing 20 of the device below the hopper 13 as shown in FIG. The optical path length correction block 42 has a thickness t in the second optical path 2 direction of t.
₂ and a cube.

The optical path length correction block 42 is made of, for example, the same material as the transparent body 141, that is, hard acrylic. In this case, it is possible to easily set n ₁ = n ₂ . The optical path length correction block 42 may be made of glass. In this case, if the equation (1) is rearranged to be equal to a, n ₁
As ≠ n ₂ , n ₁ , n ₂ , t ₁ , t ₁ in place of equation (2)
_The relationship to be satisfied in ₂ can be easily found. Thus, by setting n ₁ , n ₂ , t ₁ , and t ₂ according to this relationship, the apparent optical path length of the second optical path 2 can be made equal to “a”.

As described above, by correcting the apparent optical path length of the second optical path 2 to be equal to the apparent optical path length a of the first optical path 1, the cassette 14 as a moving original is corrected.
, The original in the cassette 14 can be read correctly.

The mirrors 7 to 9 are usually located at a position forming the first optical path 1, that is, at a first position indicated by a dotted line in the figure.
When the second optical path 2 is configured, the optical path is moved from the first position to a second position indicated by a solid line in the drawing. This movement is performed by moving means (not shown) such as a motor and a belt. The first position and the second position may be provided with two sets of mirrors 7 to 9 so that the optical path may be moved from the second position to the first position. You may make it retreat so that it may not become.

Here, the mirror 7 facing in the shape of "C" is used.
And a second position of 8, the second optical path 2 is an optical path length correction block 42 vertically (in the thickness t ₂ direction) transverse position. Then, the first positions of the mirrors 7 and 8 are set to positions away from the first optical path 1 so that the first optical path 1 does not cross the optical path length correction block 42.

The movement of the mirrors 7 to 9 is performed in the horizontal direction in the drawing, and when the mirror 9 moves by the distance "1", the mirrors 7 and 8 always move by the distance "0.5". You. As a result, the relationship of the above equation (1) is maintained.

As shown, the position where the cassette 14 and the like are placed on the platen glass 11 differs between the case where the reading is performed by the first optical path 1 and the case that the reading is performed by the second optical path 2. In the case of using the second optical path 2, the center position of the reading is substantially directly below the light source 18 (the position where the second optical path 2 intersects the upper surface of the platen glass 11). Accordingly, the cassette 14 is positioned substantially directly below the light source 18 when reading. This allows
It is possible to prevent the document holders 142 and 143 having a predetermined thickness from obstructing reading of the document inside the document holders 142 and 143.

In the case of the first optical path 1, the central position of the reading is a position slightly shifted from directly below the light source 18 toward the discharge roller 17 (the position where the first optical path 1 intersects the upper surface of the platen glass 11). Therefore, the original (cut sheet) is positioned at a position shifted from immediately below the light source 18 at the time of reading.

However, for the original, the original holder 14
There is no obstacle like 2,143. Also, Paper Guide 1
9, a light guide 195 formed to be directed to the light source 18 is provided, so that the light from the light source 18 irradiates the entire original. Therefore, there is no problem in reading the document.

In addition to the above-mentioned moving document, a fixed document is fed by an operator. The platen glass 12 determines a reading position for a fixed original. An original (cut sheet) is placed on the platen glass 12 by an operator before reading.

The fixed original is subjected to reflection reading by the third optical path 3 shown by a dashed line in FIG. The third optical path 3 extends from the upper surface of the platen glass 12 to the mirror 1.
Through 0, 8 and 7, through the lens system 6 and up to the CCD 5, it is constituted by these elements. Third optical path 3
Is an optical path for reading a fixed original placed on the platen glass 12.

The apparent optical path length of the third optical path 3 is, for example, equal to the apparent optical path length a of the first optical path 1. For this reason, the thickness of the platen glass 12 and the position of the upper surface are the same as those of the platen glass 11. Also, the mirror 10
Actually, it is obtained by moving the mirror 9 in the left horizontal direction in the figure. Along with this, the mirrors 7 and 8 are also moved in the left horizontal direction. When the moving distance of the mirror 9 is "1", as described above, the moving distance of the mirrors 7 and 8 is "0.5".
It is said.

The mirrors 7 to 9 are usually located at the first position, and are moved to the third position when forming the third optical path 3. This movement is performed by an instruction input from an operation panel of the operator or by detecting a document on the platen glass 12 using a sensor. Note that the mirror may be moved from the third position to the first and second positions, or three sets of mirrors 7 to 9 may be provided at the first to third positions. As described above, the mirrors 7 to 9 are moved by, for example, an operator's instruction input from the operation panel.

The light source for reflection reading is mirror 1
0 (not shown). This light source is actually provided near the mirror 9 and moves together with the mirror 9 near the third position.

FIG. 6 is a block diagram of another embodiment, corresponding to FIG. In this embodiment, the optical path length correction block 4
In addition to the optical path length correction block 42, the first optical path 1
The optical path length correction block 41 is provided. The optical path length correction block 41 has a predetermined refractive index n ₄ , is inserted into the first optical path 1, and has an apparent optical path length equal to the apparent optical path length a of the third optical path 3. Correct so that

As can be seen from the above, in the present embodiment, the third
The apparent optical path length of the optical path 3 is “a” as in the above-described embodiment, but the apparent optical path length of the first optical path 1 is increased by the distance t ₃ as shown in the figure. (The reason will be described later). Accordingly, the apparent optical path length of the first optical path 1 is corrected by the optical path length correction block 41 so as to be the same as the apparent optical path length a of the third optical path 3, and the original is faithfully read even by the first optical path 1. Have to be able to.

Accordingly, in this embodiment, the second
The apparent optical path length of the optical path 2 is also adjusted by the optical path length correction block 42.
Thus, the correction is made to be the same as the apparent optical path length a of the third optical path 3 so that the original in the cassette 14 can be faithfully read. Therefore, unlike the previous embodiment, the optical path length compensation block 42 has a refractive index n _5.

The optical path length correction block 41 may be made of the same material as the optical path length correction block 42, such as hard acrylic or glass, or may be made of a different material. Therefore, the refractive index n ₄ may be the same or different from n ₅ . The thickness of the optical path length correction block 41 in the direction of the first optical path 1 is t ₄ , and the thickness of the optical path length correction block 42 in the direction of the second optical path 2 is t ₅ . The optical path length correction blocks 41 and 42 are cubic,
It is formed integrally or individually and inserted into the housing 20 of the device as shown in FIG.

By making the apparent optical path length of the first optical path 1 and the like longer than the apparent optical path length a of the third optical path 3 by t ₃ , more cassettes 14 can be automatically fed. It is possible to supply the cassette 14 or the like from both directions (left and right directions in the figure).

That is, as described above, it is not preferable to bend the cassette 14. If bending is allowed, the cassette 14 becomes extremely expensive, and the bending may damage the internal film and the like. Therefore, as shown in FIG.
Are formed on substantially the same surface, and the cassette 14 needs to be supplied from the hopper 13 substantially horizontally. On the other hand, each roller 15
The mirrors 7 to 9 are provided below the optical path lengths 17 to 17, and the optical path length correction block 4 is further provided. For this reason, the position of the hopper 13 cannot be lowered much. For the above reasons, as shown in FIG. 2, only a few cassettes 14 can be placed on the hopper 13 and the number of cassettes is small, which may be inconvenient.

Therefore, the positions of the rollers 15 to 17, the platen glass 11 and the like (the position of the housing of the device) are maintained while the positions of the mirrors 7 to 9, the hopper 13, and the optical path length correction block 4 (the positions with respect to the housing 20 of the device) are kept. Position relative to body 20)
Is changed upward (only by t ₃ ), it is possible to place more cassettes 14 on the hopper 13 and supply them automatically. Note that t ₃ is actually the cassette 14
Large enough for the thickness of the.

Further, by this change, a second hopper (not shown) can be attached above the platen glass 12 on the discharge roller 17 side. This second hopper is
If it is detachable, it does not hinder the setting of the fixed document. In this case, the discharge roller 17 functions as a pick roller and a feed roller, and the feed roller 16 and the pick roller 15 function as a discharge roller.

The change in the apparent optical path length due to the change in the position of the platen glass 11 or the like is corrected as follows. Regarding the first optical path 1, an optical path length correction block 41 having a refractive index n ₄ and a thickness t ₄ ,

[0068]

(Equation 3)

The correction is made as follows. The apparent optical path length of the first optical path 1 is represented by Expression (3). Here, for simplicity, assuming that n ₁ = n ₄ = n ₅ ≡n and equation (3) is equal to “a”, equation (4) is obtained. When n and t ₃ are determined, the apparent optical path length of the first optical path 1 is corrected to be equal to “a” by using the optical path length correction block 41 having the thickness t ₄ according to the equation (4). it can.

For the second optical path 2, an optical path length correction block 42 having a refractive index n ₅ and a thickness t ₅ provides:

[0071]

(Equation 4)

The correction is made as follows. The apparent optical path length of the second optical path 2 is represented by Expression (5). Here, similarly to the above, if n ₁ = n ₄ = n ₅ ≡n and equation (4) is equal to “a”, equation (6) is obtained. When n and t ₃ are determined, by using the optical path length correction block 42 having the thickness t ₅ according to the equation (6), the apparent optical path length of the second optical path 2 is corrected to be equal to “a”. it can.

[0073]

As described above, according to the present invention,
In an original reading apparatus, an optical path length correction block is inserted into an optical path for reading when a cassette for protecting an original such as a film is supplied as a moving original, so that an apparent optical path length of the reading optical path is set in the cassette. Can be corrected to be equal to the apparent optical path length of the reading optical path when not used, so that even if a cassette is supplied as a moving original, the internal document can be read faithfully and the film etc. will be damaged. And can be automatically fed as a moving document.

[Brief description of the drawings]

FIG. 1 is a principle configuration diagram of the present invention.

FIG. 2 is an explanatory view of an embodiment.

FIG. 3 is an explanatory diagram of a cassette.

FIG. 4 is an explanatory diagram of a cassette.

FIG. 5 is an explanatory diagram of a paper guide.

FIG. 6 is an explanatory view of another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 1st optical path 2 2nd optical path 3 3rd optical path 4,41,42 Optical path length correction block 5 CCD 6 Lens system 7-10 Mirror 11,12 Platen glass 13 Hopper 14 Cassette 15 Pick roller 16 Feed roller 17 Discharge Roller 18 Lamp (light source) 19 Paper guide 20 Housing

Claims (2)

(57) [Claims] An original and a cassette (14) sandwiching the original.
A first type of original reading for automatically supplying a predetermined moving original reading position and reading the original, and a predetermined fixed original
For reading a document previously placed at the reading position for
A first optical path (1) for reading when the original is supplied to a predetermined moving original reading position, and a cassette that sandwiches the original. (14) is an optical path for reading when it is supplied to a predetermined reading position for a moving document, the second optical path (2) different from the first optical path (1), and a predetermined fixed path. Scans the original placed at the original reading position.
A first optical path (1).
A third optical path (3) having a predetermined refractive index and being inserted into the second optical path (2), and setting an apparent optical path length of the second optical path (2) to the first optical path (2).
The optical path of (1) the optical path length for the second optical path to correct so as to be equal to the optical path length of the apparent correction block (42) and the small of
And an apparent optical path length of the first optical path (1);
An apparent optical path length of the optical path (2) and the third optical path (3);
A document reading apparatus wherein the apparent optical path lengths are set to be equal to each other . 2. A plurality of rollers (15, 16, 17) for transporting a cassette (14) sandwiching the document, wherein the cassette (1) sandwiches the document during transport.
2. The document reading apparatus according to claim 1, further comprising rollers (15, 16, 17) having a shape that does not contact the transparent body (141) at the center of (4).