JPH0226468A - Reader - Google Patents

Abstract

PURPOSE:To attain low cost and high resolution reading by moving a high density reading part to read an original at higher density than a reading part in a main scanning direction and positioning. CONSTITUTION:A high density reading part 9 of a high density reading unit 90 is moved to a main scanning direction to set it to the reading starting position of a picture by the fact that the position of a light box 6, that is, the position of the reading position in a reader side is detected by a phototypewriter. When it is finished and a light source 70 of a reading head 7 is lighted, after putting out it, a light source 61 of the light box 6 is lighted, the picture is lighted, the action of the reading of a transmitted light image is started by the high density reading part 9. Thus, cost rising is suppressed, and reading without lowering resolution to the reading on purpose to enlarge is attained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a reading device for reading a document in an image forming apparatus such as a copying machine.

[Prior Art] In recent years, digital copying machines that can read a document using an image reader and store and process the image information as electrical signals have become popular. A system has been developed that allows for partial enlargement to obtain considerably larger copies.

[Problem to be solved by the invention]

By the way, when obtaining a large-sized copy as mentioned above, it is enlarged by signal processing or read using an enlarging optical system, but when the enlargement ratio is large, the resolution of the image decreases. Put it away.

This is because the reading section only has a reading density that does not interfere with normal reading, and to prevent the resolution from decreasing when enlarged, use a reading section with a high reading density. There is a need. However, reading for the purpose of enlarging is not performed very often, and replacing the reading unit with one with a higher reading density just for that purpose may result in unnecessary cost increase, which is not preferable.

The present invention has been made in view of the above circumstances, and provides a reading device that suppresses high costs by using existing equipment and enables reading for the purpose of enlarging without reducing resolution. With the goal.

(Means for Solving the Problems) A reading device according to the present invention includes a reading section having a predetermined reading width in the main scanning direction in order to read a document in a raster scan manner. A raster scan type high-density reading section that has a smaller reading width in the main scanning direction and reads the document at a higher density than the reading section, and a cough high-density reading section are moved and positioned in the main scanning direction. It is characterized by comprising means.

[Effect]

The high-density reading section is moved and positioned in the main scanning direction, and reads the document at a higher density than a normal reading section.

[Example] The reading device according to the present invention (hereinafter referred to as the present invention device) is
Equipped with four reading modes depending on the type of document.
First, in mode 1, a normal opaque original is irradiated with light and an image is read using the reflected light. Mode 2 is a mode related to the main part of the present invention, and like mode 1, it reads an opaque original, but it reads at a higher density than mode 1, so when the read image is enlarged, This also prevents the image resolution from decreasing. Mode 3 is for reading a relatively large transparent original, such as a transparent sheet for 0IIP, and its reading density is equivalent to mode 1. Mode 4 is
By using the method of reading an opaque original in mode 2 at high density, a small transparent original, that is, a photographic film, is read at high density.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below based on drawings showing embodiments thereof. 1 and 2 are external perspective views of the apparatus of the present invention, in which the main body 1 of the reading apparatus is provided with a document table glass 2 on the upper surface, an operation panel 3 on the front side thereof, and a photograph of mode 4 on the left side. Opening 4 used when reading the film
(See FIG. 2), and the rectangular opening 4 has a longitudinal direction extending along the depth direction of the original platen glass 2.
That is, it is provided to match the depth direction of the reading device main body 1. In the opening 4, a seat plate 40 for mounting the film holder 5 and light box 6 shown in FIG. Is this the manuscript glass? Holes 41 and 41 are bored near a portion of both of the closer corners. Further, on the left side edge of the opening 4, a plurality of photo-interchangers 42 for detecting the position of the light box 6, which will be described later, are arranged side by side at equal intervals.

When the film holder 5 and light box 6 are not attached, that is, when mode 4 reading is not performed, the opening 4 is sealed with a lid (not shown) to prevent operations in other reading modes. It is configured so that it does not become

FIG. 3 is a perspective view showing the internal structure of the reader main body 1. At the inner bottom of this is a pair of rails 10a having a length slightly shorter than the width of the reader main body 1.

The rails 10b are arranged opposite to each other with their longitudinal directions aligned with the width direction of the reader main body 1.

On 10b, a rectangular parallelepiped-shaped reading head 7 having a depth slightly shorter than the depth of the reading device main body l is placed in a straddling state with its longitudinal depth direction orthogonal to the extending direction of each of the rails. ! ! pulleys lla and llb provided on the rails 10a and 10b so as to be driven by a motor 13, and a wire 12a stretched over these;
12b, it moves on the rails 10a, 10b in the width direction of the reader main body 1, that is, in the left-right direction.

FIG. 4 is a longitudinal cross-sectional view of the reading head 7 taken in a direction perpendicular to the depth direction and viewed from the front, and FIG. 5 is a perspective view showing the internal structure of the reading head 7. The reading head 7 has an opening formed in the center of its upper surface over the entire length in the depth direction, and a glass plate 74 is sealed in the opening. low density reading section 8,
Furthermore, a high-density reading section 9 used in modes 2 and 4 is provided respectively, and is made of, for example, an aperture-type fluorescent lamp located near the glass plate 74 with its axial length direction being the depth direction of the reading head 7. A light source 70 is arranged. The light source 7
0 has a length substantially equal to the length in the depth direction of the original platen glass 2, and is mounted so as to face the lower surface of the original platen glass 2 through a glass plate 74, as shown in FIG. 6, which will be described later. It can be rotated in the circumferential direction by a drive mechanism.

The low-density reading section 8 is disposed on the right side of the light source 70, and the low-density reading section 8 includes an imaging element (lens) 81 and a solid-state imaging element 8, each having approximately the same length as the light source 70.
2, the light incident side of the imaging element 81 is placed facing the glass plate 74, and the solid-state image sensor 82 is placed oppositely below the light output side. In other words, the low density reading section 8
is configured so that the longitudinal direction of the document is aligned with the depth direction of the document table glass 2 to perform main scanning on the document.

The left side of the light source 70 has a reading width of 115 to 1/10 of the reading width of the low-density reading section 8, and its longitudinal direction is parallel to the longitudinal direction of the low-density reading section 8, that is, the document platen glass. A high-density reading section 9 is arranged in the main scanning direction of No. 2, and the high-density reading section 9 is composed of a reading lens 91 and a solid-state image sensor 92. Similarly, the incident side of the reading lens 91 is connected to a glass plate. 74, and a solid-state image pickup device 92 is placed oppositely below the emission side. Reading lens 91
For example, a convergent rod lens is used, and this is because solid-state imaging devices for high-density reading have lower sensitivity than those for low-density reading. /N ratio. The high-density reading unit 9 is a rectangular box-shaped high-density reading unit 90 whose one end is inserted through a shaft 73 that is disposed parallel to the axial direction of the light source 70 over the entire length of the reading head 7 in the depth direction. It is equipped inside,
The high-density reading unit 90 is provided with a roller 93 on the side surface opposite to the insertion portion of the shaft 73 so that its rotation axis is perpendicular to the longitudinal direction of the shaft 73, and is provided in the reading head 7. The pulleys 71a and 71b driven by a stepping motor 72 and a wire 75 stretched between them are configured to move in the longitudinal direction of the shaft 73, that is, in the depth direction of the reading head 7, and to position it.

FIG. 6 is a longitudinal cross-sectional view showing an example of a drive mechanism that rotates the light source 70 in the circumferential direction.
The rack teeth of the light source 70 are meshed with the teeth 76 formed on a part of the peripheral surface of the light source 70, and the aperture 0a of the light source 70 is moved in the direction of the position A when the rack 77 is protruded, and when it is retracted. In this case, the irradiation direction can be switched to either of the two directions A and B.

Now, in the above configuration, reading operations in modes 1.2 and 3 will be explained. First, when reading an opaque original in mode 1 at low density, the aperture 0a of the light source 70 is
Set the direction so that the light is projected to position A. Then, the light source 7 illuminates the lower surface of the opaque original placed on the original platen glass 2.
0 light is emitted, and this diffusely reflected light is imaged on the solid-state imaging element 82 by the imaging element 81 of the low-density reading section 8, and main scanning is performed by electrically scanning, and one line of image information is obtained. get. Furthermore, by driving the motor 13,
By moving the reading head 7 in the width direction of the reading device main body 1, sub-scanning of the original image is performed. Here, the image reading density by the low-density reading section 8 is 10 to 20 pixels/pixel.

Next, if you want to read the reflective original in mode 2 at high density, first move the high density reading unit 90 to the stepping motor 72.
is moved to a desired position of the opaque original on the original table glass 2 in the main scanning direction. The aperture 0a of the light source 70 is oriented so as to project light to the position B, and similarly, by irradiating the light from the light source 70, an image at the position B is formed by the reading lens 91 onto the solid-state image sensor 92. The image is imaged to perform main scanning, and the motor 13 is driven to perform sub-scanning. The image reading density by this high-density reading section 9 is 50 to 200 pixels/III,
When compared with the low-density reading section 8, the resolution does not decrease even if the read image is enlarged.

When reading a large transparent original at low density in mode 3, a light hood shown in FIG. 7 is used. Figure 7 shows
FIG. 3 is a longitudinal cross-sectional view showing a state in which the light hood is attached to the reading device main body (2). The light hood 10 placed on the document table glass 2 of the reading device main body l has a square pyramid shape, and is equipped with a light source 11 at the top of the light hood 10, and a heat-insulating filter arranged below the light hood 10 to direct the light from the light source 11. 12 to diffuse irradiation to the bottom side. A Fresnel lens 13 and a transmission diffusion plate 14 are arranged in a laminated manner at the bottom.
The lower surface side of the document is placed opposite to a transparent original (not shown) placed on the original platen glass 2. The transmission diffuser plate 14 is provided to alleviate illumination unevenness such as an annular shadow of the Fresnel lens 13. Reading of the transparent original is performed by the low-density reading section 8 in the same manner as in mode I.

As described above, in all modes 1 to 3, an original is placed on the original platen glass 2 and the original image is scanned.

Next, the structure of the film holder 5 and light box 6 for reading photographic film in mode 4 will be explained. 8 and 9 are external perspective views showing the structure of the film holder 5, and the reader main body 1.
The long plate-shaped film holder 5 to be fitted into the opening 4 has a presser holder 5a and a rectangular opening 50a, 50b, each having a rectangular opening 50a, 50b having a short side having a length substantially equal to the image width of the film in the center thereof. It is constructed by integrally bonding the substrate 5b, and by changing the way these are bonded, it is possible to interpose and hold both a slide film and a normal negative film between the two members.

FIG. 8 shows a case where a slide mount on which a slide film is mounted is held, and the substrate 5b has a recess 51b on the upper surface of which the slide mount is inserted and placed.
, 51b are formed at two locations each on the side edge portion in the length direction of the opening 50b, that is, for two pieces, a total of four locations. The depth of the recess 51b is determined so that the height of the top surface is lower than the top surface of the substrate 5b. The substrate 5b is
There are pins 58.5 near both corners on the front side of the top surface of this.
8, and also pins 59 near both corners on the back side of the bottom surface.
．． 59 (see Fig. 9) are provided in a protruding manner. The presser plate 5a has convex portions 51a that fit into the recesses 51b of the substrate 5b at four locations (see FIG. 9) on the lower surface thereof, and on the side edges in the length direction of the opening 50a. , the protrusion height of this convex portion 5La from the lower surface of the holding plate 5a is approximately equal to the length from the upper surface of the slide mount to the upper surface of the substrate 5b when the slide mount is inserted and placed in the recess 51b of the substrate 5b. It is the norm. At positions between the convex portion 51a and both longitudinal edges of the presser plate 5a, there are elongated holes that are slightly shorter than the length of the presser plate 5a and whose longitudinal direction coincides with the lengthwise direction of the presser plate 5a. A shaped guide hole 52, 52 is formed to penetrate in the thickness direction. A groove 550 whose longitudinal direction coincides with the longitudinal direction of the holding plate 5a is formed on the front side surface in the longitudinal direction of the holding plate 5a, and the liquid groove 550 has recessed holes 55, 55 having a hole diameter larger than the groove width. ．． ... are drilled at equal intervals. There is a board 5 near both corners on the front side.
A hole 53.53 into which the pin 58.58 of b is inserted is formed to penetrate in the thickness direction.

When holding a slide mount with the film holder 5 configured as described above, first, the slide mount (not shown) is inserted and placed in the recesses 51b, 51b of the substrate 5b. Then, the convex portions 51a, 51a of the presser plate 5a are fitted into the recesses 51b, 51b, and the pins 58, 58 of the substrate 5b are fitted into the holes 53,53 of the presser plate 5a, thereby connecting the presser plate 5a and the substrate 5b. Combine with. As a result, the slide mount is held at its side edges,
Openings 50a and 50b are located in a direction perpendicular to the screen of the image portion of the slide film, so that both sides of the image are exposed to the outside.

Figure 9 shows a case in which a negative film, that is, a film piece cut into a predetermined number (usually 5 frames) of a single film to be stored in a storage case, is held. 5a and the substrate 5b, the surfaces opposite to the surfaces shown in FIG. 8 are used. The substrate 5b has an opening 50 in the center of its upper surface (lower surface in FIG. 8) in the width direction.
A recessed portion 57b having a bottom portion having a width substantially equal to the film width is formed over the entire length of the substrate 5b in the longitudinal direction.

The same pins 59 and 59 are protruded near both corners on the front side of the upper surface as described above.
A convex portion 56a, which is fitted into the recess 57b, is formed on the lower surface (the upper surface in FIG. 8) of the presser plate 5a, extending along the entire length of the holding plate 5a. A groove 560 and a recessed hole 56, 56, . ...is formed.

Holes 54, 54 into which the pins 59, 59 of the board 5b are inserted are provided near a portion of both corners on the front side, that is, near a portion of the corner where the holes 53, 53 are formed and a portion of the corner on the opposite side.
is formed by penetrating it in the thickness direction.

When holding a film piece with the film holder 5 configured as described above, the film piece is held in the recess 5 of the substrate 5b.
7b and place it there. And a convex portion 56a of the presser plate 5a
is fitted into the recess 57b, and the pin 59 of the board 5b is fitted into the recess 57b.
．． 59 are fitted into the holes 54, 54 of the holding plate 5a to connect the holding plate 5a and the substrate 5b. As a result, the film piece is sandwiched at its winding hole portion and both ends in the length direction, and the openings 50a and 50b are located in the direction perpendicular to the screen of the image portion of the film, so that both sides of each image are exposed to the outside. Let them come to you.

FIG. 10 is an external perspective view showing how the light box 6 is attached to the film holder 5, and FIG. 11 is a longitudinal section of the main body 1 of the reading device including a longitudinal section taken along the line XI-XI showing its internal structure.
FIG. 2 is a vertical cross-sectional view of a main part showing a state in which the film holder 5 is attached to the camera, and shows a state in which the film holder 5 holds a slide mount.

The light box 6 has a rectangular parallelepiped shape with a bottom that is approximately the same size as the slide film 00 held in the film holder 5, and has pedestals 68a and 68b extending from both ends of the bottom in the depth direction. Each pedestal 68a,
The protrusions 68c and 68d provided on the lower surface of the film holder 5 are connected to the guide hole 52 formed in the holding plate 5a of the film holder 5.
52 and is movable in the longitudinal direction of the film holder 5. Further, when holding a slide film or a piece of film, a recess 69 that engages with the projection 57a or both of the projection 51a located on the upper surface of the presser plate 5a is provided at the bottom for the entire length in the width direction, that is, in the moving direction. It was formed over a period of time.

A positioning plate 66 for selecting a film image to be illuminated and a light shielding plate 67 used for detecting the position of the light box 6 on the film holder 5 are attached to the pedestal 68a. The positioning plate 66 is bent like a leaf spring from the upper surface of the pedestal 68a to the lower side of the light box 6, and a hemispherical protrusion provided at the center of the positioning plate 66 is engaged with a groove 550 formed on the side surface of the holding plate 5a. It is designed to slide as the light box 6 moves,
The film image is positioned by fitting it into the recessed hole 55 provided based on the longitudinal arrangement position of the film holder 5 of the slide mount 100 and the arrangement interval of each frame of the negative film. The light shielding plate 67 protrudes forward from the upper surface of the pedestal 68a, and when the light box 6 and the film holder 5 are installed in the opening 4 of the reader body The position of the light box 6 on the film holder 5 is detected by intervening in the optical path provided in the vertical direction and blocking light.

As shown in FIG. 10, the inside of the light box 6 includes a light source 61 for film illumination on the top thereof, a heat shield filter 62 on the bottom side thereof, and a cooling fan 65 on the negative side. A collimator lens 63 and a transmission diffusion plate 64 are arranged in a laminated manner at the bottom, and the lower surface of the transmission diffusion plate 64 is configured to face the film of the film holder 5.

The operation of reading an image on a photographic film using the film holder 5 and light box 6 constructed as described above will now be described. First, the operator holds either the slide mount or the film piece with the film holder 5 as described above, attaches the light box 6 to this, and then
Or, if you want to install it later, please use the reader body 1 as is.
It is installed in the opening 4 of the This attachment is performed using pins 58.5B located on the lower surface side of the substrate 5b, depending on the film held.
or 59.59 by fitting into the hole 41.41 provided in the seat plate 40 in the opening 4.

Then, by moving the light box 6 attached to the film holder 5 in the longitudinal direction of the film holder, the light box 6 is positioned over a desired image. Here, it is also possible to confirm the image more clearly by turning on the light source 70 of the reading head 7.

On the reading device side, the position of the light box 6, that is, the position of the image to be read, is detected by the photointerrupter 42, so that the high-density reading section 9 of the high-density reading unit 90 reads the image as shown in FIG. It moves in the main scanning direction to set it to the reading start position. When this is finished, if the light source 70 of the reading head 7 is lit,
After turning off the light, the light source 61 of the light box 6 is turned on to illuminate the image, and the high-density reading section 9 starts reading the transmitted light image.

In this embodiment, the film holder is configured to be mounted with an opening provided on the left side of the top surface of the reader with the longitudinal direction of the film holder aligned with the main scanning direction of the reader. It is also possible to configure the sensor to be mounted, for example, on the front portion of the upper surface of the reading device so as to match the sub-scanning direction. In this embodiment, an aperture-type fluorescent lamp is used as the light source when reading a reflective original, but instead of this, a structure may be used in which the direction of the reflective shade of a halogen lamp is changed, and a reflective original can be read at a high density. If the illuminance of the light source is insufficient for reading, an auxiliary light source may be provided. Further, in this embodiment, a convergent rod lens is used in the high-density reading section, but if the amount of light is sufficient, a through lens may be used to configure the zoom optical system.

Furthermore, although a photo-interchanger is used to detect the position of the light box on the film holder, the present invention is not limited to this, and a micro switch or the like may also be used. In addition, in this embodiment, the number of slide mounts that can be held in parallel on the film holder is two, but it goes without saying that a structure that can hold two or more sheets may also be used.

(Effects) As described above, in the reading device according to the present invention, when normally reading a document, the existing low-density reading section is used,
When reading a document for the purpose of enlarging it, a separately provided high-density reading section is used. As a result, when an image read by the high-density reading section is enlarged, the resolution does not decrease, and a high-resolution read image can be obtained. In addition, the high-density reading section has a reading width in the main scanning direction that is smaller than that of the low-density reading section in order to reduce the cost of reading equipment such as solid-state image sensors and signal processing circuits. Instead, by configuring the high-density reading section so that it can move in the main scanning direction of the document table, it is possible to read the desired position of the image, and of course this can be used to divide the entire image. It is possible to obtain large-sized copies by enlarging the images and reading them, and similarly obtain clear images with high resolution. Furthermore, the high-density reading section can be installed in the same reading head along with the existing low-density reading section, which allows the drive system required for sub-scanning to be shared, minimizing the increase in parts. , it is possible to suppress cost increases. In addition, the high-density reading section can read small transparent originals such as photographic film with high density by using a small light box, etc. As a result, conventionally, film images can be read using a projector etc. The present invention is advantageous in that it is no longer necessary to secure a large space for the optical path for enlarging and projecting the film, and reading with high resolution can be easily performed even in a limited space. It has a great effect.

[Brief explanation of the drawing]

1 and 2 are external perspective views of a reading device according to the present invention, FIG. 3 is a perspective view showing its internal structure, FIG. 4 is a vertical sectional view of the reading head, and FIG. 5 is a perspective view of its internal structure. A perspective view showing,
FIG. 6 is a longitudinal cross-sectional view showing the drive mechanism for switching the irradiation direction of the light source, FIG. 7 is a vertical cross-sectional view showing the light hood installed, and FIGS. 8 and 9 are external perspective views of the film holder. FIG. 10 is an external perspective view showing how the light box is attached to the film holder, and FIG. 11 is a longitudinal cross-sectional view of essential parts showing how the light box and film holder are attached to the main body of the reading device. ■...Reading device body 2...Original table glass 4...
・Opening portion 5...Film holder 6...Light box 7...Reading head 8...Low density reading section 9
...High-density reading section

Claims (1)

[Scope of Claims] 1. In an apparatus equipped with a reading section having a predetermined reading width in the main scanning direction in order to read a document using a raster scan method, a reading width smaller than the reading width of the reading section in the main scanning direction is provided. , comprising: a raster scan type high-density reading section that reads a document at a higher density than the reading section; and means for moving and positioning the high-density reading section in the main scanning direction. reading device.