JP2912515B2 - Document cassette - 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 cassette used for loading various reading documents carrying image information into an image reading apparatus.

[0002]

2. Description of the Related Art In the field of printing and plate making, an image scanning reading and reproducing system for electrically processing image information carried on a document to create a film original plate for the purpose of streamlining work processes, improving image quality, and the like. Used.

In this case, in an image reading apparatus constituting the system, a reading document positioned and accommodated in a document cassette is transported to a reading section, and the reading section transports the document cassette in a sub-scanning direction while transmitting illumination light in a main scanning direction. Irradiates the image information two-dimensionally.

When illuminating the reading original with illumination light through the original cassette, light incident from the periphery of the reading original forms a flare as a photoelectric conversion element, for example, a CC.
D may be introduced. In this case, it may be difficult to read an accurate image.

Therefore, as a countermeasure, the flare is prevented by mounting a light-shielding mask on the glass plate of the document cassette to block light from around the document.

However, in the above-described conventional technique, it is necessary that the size of the flare preventing mask be different if the size of the read document is different. Therefore, there is a problem that both the manufacturer and the user have to prepare various types of document cassettes according to the type of the document to be read.

Therefore, the present applicant can use the original cassette body in common for reading originals of different sizes by configuring the glass plate on which the mask is formed or the mask itself to be replaceable with respect to the original cassette. (See Japanese Patent Application No. 3-71234).

[0008]

However, even in the above-mentioned original cassette, glass plates having masks of various shapes or the mask itself must be prepared for originals of different sizes. Leads to an increase in

SUMMARY OF THE INVENTION The present invention has been made to solve this kind of problem, and in a document cassette on which a document to be read is set, flare prevention is realized with a small number of parts for documents of various sizes. It is an object of the present invention to provide a manuscript cassette which can be used.

[0010]

In order to achieve the above object, the present invention provides a document cassette which holds a document to be read and which is loaded into an image reading apparatus. And a light-transmitting portion printed on the support member or the cover member and defined by an inner ring portion positioned inside the outer shape of the predetermined read document, and illuminating light from around the predetermined read document. A light-shielding mask,
Positioned and sandwiched between the support member and the cover member,
The light-shielded portion of the light transmitting portion of the mask, and a mask sheet that form the light-shielding portion corresponding to the small read document than a size of the predetermined document reading, the mask sheet
A reading member held between the supporting member and the cover member.
Cut lines that can be cut according to the type of
Fine size of the document and said that you have been printed.

[0011]

In the original cassette according to the present invention, a mask is printed on a supporting member or a cover member corresponding to a predetermined original to be read. By holding a mask sheet cut to a predetermined size at a predetermined position between a support member and a cover member, flare is prevented by the mask and the mask sheet. On this occasion,
There is no need to prepare masks of various sizes or cover members on which masks are printed, depending on the size of the original,
The mask sheet may be cut to an appropriate size and the mask sheet may be sandwiched between the support member and the cover member, so that the number of parts can be reduced.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the document cassette according to the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 1, the original cassette 10
A frame 12 formed in a substantially rectangular shape and a rectangular opening 14 defined in the center of the frame 12 are mounted on the frame 12, and the flare corresponding to a maximum size of 6 cm × 9 cm original in a brownie film. It has a supporting glass plate 16 on which a mask 15 for prevention is deposited on the lower surface, and a cover glass plate 20 which is attached to the frame 12 via a hinge member 18 and which can open or close the opening 14. ing.

As shown in FIG. 2, when the cover glass plate 20 closes the opening 14, the cover glass plate 20 and the support glass plate 16 face each other in a substantially parallel posture, The document S abutted on a mask sheet described later is held between the glass plates 16 and 20. The glass plate 16,
The opposite surfaces of 20 are subjected to a nanglare treatment.

The document cassette 10 is provided with a cassette identification section 22 and V-shaped grooves 23a and 23b on its side.

In view of this, two register pins 24a and 24b as projections are provided on the frame 12 at predetermined positions in the width direction orthogonal to the direction of the arrow A which is the conveyance direction. In this case, the register pins 24a and 24b are set at positions where they respectively engage with the two holes 32a and 32b defined in the extremely thin film-like mask sheet 30 shown in FIG. The shape of the register pins 24a, 24b is engaged with the holes 32a, 32b of the mask sheet 30, and
Needless to say, as long as 0 can avoid displacement in the document cassette 10, it can be cylindrical, prismatic, elliptical, or any other shape. For example,
As shown in FIG. 3, the hole 32a has a circular shape, while the hole 32b has an oval shape. This is because, after the register pin 24a is inserted into the hole 32a, the other register pin 24b is easily inserted into the hole 32b.

On the other hand, the mask sheet 30 is formed of a light-impermeable black film base or the like, and the thickness of the original S
Although it is thinner than that, it may be the same thickness. On the upper surface of the mask sheet 30, for example, when two sheets of Brownie film are set in the same original cassette 10, the type of the original S positioned in the original cassette 10 on the mask sheet 30 as shown in FIG. The cutting line and the document size are printed so as to be cut correspondingly.

Next, the original cassette 10 according to this embodiment is
An image reading apparatus to which is mounted will be described.

In FIG. 4, reference numeral 80 denotes an image reading device. A cassette attaching / detaching portion 84 is provided at one upper end side of a housing 82 constituting the image reading device 80. The document cassette 10 is introduced into the housing 82 and the document cassette 10 is drawn out from the housing 82.

A cassette insertion port 86 is provided near the cassette attaching / detaching portion 84, and one end of a transport mechanism 100 is disposed near the cassette insertion port 86. The other end of the transport mechanism 100 will be described later. It extends to above the turntable. The transport mechanism 100 includes a frame 102,
A plurality of guide rollers 106 are supported on the frame 102 via a rod 104 along the transport direction. The outer peripheral surface of the guide roller 106 has an arc-shaped cross section, and the outer peripheral surface is engaged with the inner wall surface defining the V-shaped grooves 23a and 23b of the document cassette 10 by point contact.

A plurality of transport rollers 132 are supported on the frame 102 via rods 130 along the transport direction. The transport roller 132 is in contact with the frame 12 of the document cassette 10 and is driven to rotate by the rotation drive source 114.

An original table 200 is provided below the transport mechanism 100.
Is in the sub-scanning direction (direction of arrow A) via the sub-scanning mechanism 202
It is arranged to be able to move forward and backward. The sub-scanning mechanism 202 includes a rotary drive source 204, and the document table 200 is displaced in the direction of arrow A by a ball screw 206 connected to the rotary drive source 204.

The document cassette 10 is trimmed on the document table 200 in the trimming direction, that is, the sub-scanning direction (the direction of arrow A).
Trimming mechanism 250 that moves forward and backward in a direction orthogonal to
Is provided. The trimming mechanism 250 is mounted on the platen 20.
0, and one end of a ball screw 254 is connected to the rotary drive source 252. The ball screw 254 extends in the trimming direction, is fitted to a nut member (not shown) provided on the trim base 256, and the other end is supported by the original table 200.

A rotating mechanism 300 for rotating the original cassette 10 on the trim stand 256 by a predetermined angle;
The document cassette 10 is placed on the turntable 302 constituting
And a positioning mechanism 400 for positioning and holding the position.

The positioning mechanism 400 includes a rotary drive source 402 fixed to the lower surface side of the trim base 256, and rotates the locking plate 414 via a cam plate 404 which is engaged with a rotary shaft of the rotary drive source 402. By doing so, the positioning of the original cassette 10 is fixed.

A light source 450 constituting a transmission illumination mechanism is provided in the housing 82 so as to extend in the main scanning direction substantially orthogonal to the direction of arrow A. Below the light source 450, the light source 450 is led out of the light source 450. An image reading unit 500 that photoelectrically reads the illumination light L to be emitted is provided. The image reading unit 500 includes an imaging lens 516 that can move forward and backward in the optical axis direction under the driving action of the rotation driving source 506, and a photoelectric conversion that can move forward and backward with respect to the imaging lens 516 under the driving action of the rotation driving source 522. Part 52
8 is provided. The photoelectric conversion unit 528 includes CCDs 530a to 530c, and each of the CCDs 530a to 530c photoelectrically reads the color image information carried on the document S as image information corresponding to each color of RGB.

The original cassette 10 and the image reading apparatus 80 in which the original cassette 10 is loaded are basically constructed as described above, and the operation thereof will be described below.

First, the mask sheet 30 is cut in accordance with the size of the document S of the brownie film set in the document cassette 10. For example, if the sizes of the originals S1 and S2 are 6 cm × 6 cm and 4.5 cm × 6 cm, respectively,
Cutting is performed along a cut line 31 (see a thick broken line portion in FIG. 3) in which this size is described. In the mask sheet 30a thus obtained (see FIGS. 1 and 5), the holes 32a and 32b are inserted into the register pins 24a and 24b, and the mask sheet 30a is positioned on the supporting glass plate 16. Subsequently, on the supporting glass plate 16, the document S
1, S2 is positioned by contacting the end surfaces 34a, 34b of the mask sheet 30a.

In this state, the cover glass plate 20 is closed to prepare the document cassette 10.

When the original cassette 10 is inserted into the cassette insertion slot 86 from the cassette attaching / detaching portion 84 of the image reading device 80, the original cassette 10 is moved by the guide roller 106 under the action of the rotary drive source 114 constituting the transport mechanism 100. The sheet is transported to the rotary table 302 by the transport rollers 132.

When the original cassette 10 is conveyed to a predetermined position on the rotary table 302, the rotation drive source 402 constituting the positioning mechanism 400 is driven, and the locking plate 414 is moved by the cam plate 404 so that the end face of the original cassette 10 is moved. Press to position.

Next, in order to adjust the angular position of the document S held in the document cassette 10, the rotating mechanism 300 is driven as necessary. Further, the trimming mechanism 250 is driven as necessary to trim the document S.

On the other hand, the original cassette 1
After the positioning of the document table 200, the rotation drive source 204 constituting the sub-scanning mechanism 202 is driven, and the document table 200 is conveyed in the sub-scanning direction (the direction of arrow A) by the rotation of the ball screw 206, and the light source 450 is activated. Accordingly, when the illumination light L derived from the light source 450 passes through the document S in the main scanning direction, the color image information carried on each document S is extracted as an optical signal, and the image information as the optical signal is obtained. Is irradiated on each of the CCDs 530a to 530c via a predetermined imaging lens 516 arranged on the optical axis. As a result, the color image information as the optical signal corresponds to each of the RGB colors and the CCD 530a.
Through 530c. During this time, the document table 200 is conveyed in the sub-scanning direction in the direction of arrow A, and each document S is illuminated two-dimensionally by the illumination light L to extract its color image information.
0c means that all are read.

When an image is read in this manner, the original cassette 10 includes the mask 15 and the mask sheet 30a of the supporting glass plate 16 except for the originals S1 and S2.
Since the light is masked and shielded from light, no flare is generated. Also, the mask sheet 30 is
The document S is configured to be cut according to the size of the original S.
It is not necessary to prepare various mask sheets corresponding to the sizes of the above, which leads to a reduction in the number of parts. Further, the holes 32a and 32b of the mask sheet 30a are
The mask sheet 30a is accurately positioned with respect to the document cassette 10 because the mask sheet 30a is engaged with the mask cassettes 30a and 24b. The document S is placed on the end surfaces 34a and 34b of the mask sheet 30a.
Since one side of S1 and S2 is brought into contact, the positioning of the originals S1 and S2 on the supporting glass plate 16 becomes easy.

In this embodiment, the mask 15 is provided on the lower surface of the supporting glass plate 16, but the mask 1 is provided on the upper surface of the supporting glass plate 16 or the upper or lower surface of the cover glass plate 20.
5 may be provided. The method of forming the mask 15 is as follows.
Other than vapor deposition, for example, silk printing may be used. Further, when positioning the originals S1 and S2 on the supporting glass plate 16, the originals S1 and S2 are placed on the end surface 34 of the mask sheet 30a.
However, the end surfaces of the originals S1 and S2 may be covered with the end surfaces 34a and 34b of the mask sheet 30a.

In the case of a document other than a Broni, for example, a 135 document, a mask sheet 40 sandwiched between the supporting glass plate 16 and the cover glass plate 20 is formed as shown in FIG. That is, the holes 42a to 42f are formed in the mask sheet 40, and the positioning auxiliary lines 44 are formed beside the holes 42a to 42f. The mask sheet 40 is positioned on the supporting glass plate 16, and the holes 42 are formed.
The document is positioned inside the a-42f via the positioning auxiliary line 44.

Further, for example, the mask sheet 30 (see FIG. 3) or the mask sheet 30b (see FIG. 7) is placed in a document cassette 50 in which a 4 inch × 5 inch document mask 15a is provided on the supporting glass plate 16. Mask sheet 3
By cutting as shown in FIG. 8C (see FIG. 8), flare is prevented during the image reading process of the original cassette 50 loaded with one or two originals S3 made of brownie film.

As described above, in the original cassette according to the present embodiment, the mask 15 for the specific original S is placed on the supporting glass 16.
Is formed, and in the case of an original having a size smaller than the original S, the difference between the set original S and the positioned original S is shielded by the mask sheet 30. Since it is only necessary to prepare a plurality of mask sheets and cut them in accordance with the size of the document S to be set, mask sheets of various sizes or glass plates 1 on which masks are printed are prepared.
It is not necessary to prepare 6, 20, etc., and the number of parts can be reduced. Further, the mask sheet 30 is accurately positioned because the holes 32a and 32b are inserted into the register pins 24a and 24b provided in the document cassette 10.

[0039]

According to the original cassette according to the present invention, the following effects can be obtained.

That is, a mask is printed on a supporting member or a cover member corresponding to a predetermined reading original, and when a reading original smaller than the predetermined reading original size is positioned in the original cassette, a predetermined size is set. By holding the cut mask sheet at a predetermined position between the support member and the cover member, flare is prevented by the mask and the mask sheet. At this time, it is not necessary to prepare masks of various sizes or cover members on which the masks are printed according to the size of the original, and cut the mask sheet into an appropriate size, and place the mask sheet between the support member and the cover member. The number of parts can be reduced because the mask sheet may be held.

In the document cassette according to the present invention, a hole is formed in the mask sheet, and a protrusion provided on the document cassette is engaged with the hole so that the mask sheet can be accurately positioned with respect to the document cassette. Positioning is performed, and light shielding for portions other than the document is performed more accurately.

[Brief description of the drawings]

FIG. 1 is an explanatory perspective view of a document cassette according to the present invention.

FIG. 2 is an explanatory sectional view of a document cassette according to the present invention.

FIG. 3 is an explanatory plan view of a mask sheet inserted into a document cassette according to the present invention.

FIG. 4 is an explanatory sectional view of an image reading apparatus in which a document cassette according to the present invention is loaded.

FIG. 5 is an explanatory plan view of a mask state in the original cassette according to the present invention.

FIG. 6 is an explanatory plan view of a mask sheet inserted into a document cassette according to the present invention.

FIG. 7 is an explanatory plan view of a mask state in the document cassette according to the present invention.

FIG. 8 is an explanatory plan view of a mask state in the document cassette according to the present invention.

[Explanation of symbols]

 10, 50: Document cassette 15, 15a: Mask 16: Support glass plate 20: Cover glass plate 24a, 24b: Register pin 30, 30, 30a, 30b, 30c, 40: Mask sheet 32a, 32b: Hole

Claims (2)

(57) [Claims] An original cassette for holding an original to be read and loaded in an image reading apparatus, a transparent support member and a cover member for sandwiching the original to be read, and a predetermined printing original printed on the support member or the cover member. A mask that has a light-transmitting portion defined by an inner ring portion located inside the outer shape and blocks illumination light from around the predetermined read document; positioning and holding the mask between the support member and the cover member And
Light-shielded portion of the light transmitting portion of the mask, and a mask sheet that form the light-shielding portion corresponding to the small read document than a size of the predetermined document reading, the support member in the mask sheet And cover part
Cutting according to the type of document to be scanned sandwiched between materials
A document cassette on which a cutout line and a document size that can be printed are printed . 2. The original cassette according to claim 1, wherein the mask sheet has a hole that engages with a projection provided on the original cassette, and the mask sheet is positioned with respect to the original cassette. A document cassette characterized by the following.