JPH07128738A - Image reader - Google Patents

Abstract

PURPOSE:To simplify the reading work of a transmissive type original by reading the transmissive type original without necessitating an enlarging and projecting device having large-scale constitution. CONSTITUTION:A transmissive type original presentation part 32 for presenting the transmissive type original DT such as 35mm film is set at a specified position on an original platen 31. The original DT is illuminated by a projection unit 70 from the outside of a device main body 30. In the case of reading the original DT, an auxiliary scanner 50 is allowed to intervene to cut into an optical path at the time of reading an ordinary original. Light from the original DT is guided to the light receiving surface of an image sensor 40 after the optical path of the light is bent by the scanner 50. When a rotary plane mirror 53 installed in the scanner 50 is angularly displaced, the area of an image made incident on the light receiving surface of the image sensor 40 is changed. Thus, the scanning of the original DT according to the read d object area of the image sensor 40 is realized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image reading device capable of reading images of normal originals and transmissive originals. A normal original is an original on which an image is formed on a light-shielding carrier, and a transmissive original is an original on which an image is formed on a transparent carrier such as 35 mm film.

[0002]

2. Description of the Related Art A typical prior art is shown in FIG. The configuration shown in FIG. 10 is for reading an image of 35 mm film by using a digital copying machine. Specifically, the magnifying projection device 3 is installed on the upper surface of the main body 1 of the digital copying machine. The magnifying projection device 3 has a projection device body 5 and a mirror unit 6. The projection device body 5 has a light source 7, a condenser lens 8, a film holder 9 and a projection lens 10. The mirror unit 6 reflects the light from the projection device body 5 into the copying machine body 1.
It has a mirror 11 arranged so as to be able to reflect toward it and a Fresnel lens 12 for focusing the light from this mirror 11 on a document table 15 on the upper surface of the copying machine main body 1. The Fresnel lens 12 also has a function as a diffusion plate.

With such a structure, the film holder 9
When the 35 mm film 16 is held on and the light source 7 is turned on, an optical image of the 35 mm film is formed on the document table 15. The document table 15 is a transparent plate on which a normal document to be copied is placed when the normal document is copied. This manuscript table 15
Below the scanner, there is a scanner unit 1 for reading a document.
7 are arranged. The scanner unit 17 includes an optical system 20 including a light source 21 including a halogen lamp and C
Image sensor 19 including a CD (charge coupled device) or the like
And have. The optical system 20 includes reflecting mirrors 22, 23, and 24 for guiding the light, which is generated from the light source 21 and is reflected by the normal document on the document table 15, to the image sensor 19, and further, an optical image of the document is formed. A lens 25 for forming an image on the image sensor 19 is provided. The reflecting mirror 22 is reciprocally displaced together with the light source 21 in the direction of arrow 26, and
3, 24 are displaced in the same direction as the light source 21 at half the speed thereof.

With this structure, the normal document on the platen 15 is scanned by the optical system 20 at a constant speed, so that the reading of the normal document is achieved. By reading the optical image of the 35 mm film 16 projected on the document table 15 by the same operation as the normal document reading operation, the image carried on the 35 mm film 16 can be read. At this time, the light source 21 is turned off.

[0005]

SUMMARY OF THE INVENTION In the above prior art,
It is necessary to magnify and project the 35 mm film 16 on the document table 15. Therefore, a large-scale magnifying projection device 3 including a large reflecting mirror and a diffusing plate must be installed on the copying machine main body 1. Therefore, the work for reading the image on the 35 mm film 16 becomes complicated, and the magnifying projection device 3
There is a problem that a large storage space is required when is not used.

Therefore, an object of the present invention is to solve the above technical problems and to provide an image reading apparatus capable of reading an image of a transmissive original by a simple operation.

[0007]

An image reading apparatus of the present invention for achieving the above object comprises an apparatus main body,
A normal manuscript presenting part provided on the outer surface of the device body for presenting a normal manuscript, which is a manuscript having an image formed on a light-shielding carrier, and a translucent material provided on the outer surface of the device body. A transparent original presenting section for presenting a transparent original having an image formed on the carrier, a reading unit provided in the apparatus body for reading an optical image incident on a light receiving surface, and the apparatus. The light source is provided inside the main body and includes a light source for illuminating the original presented to the normal original presentation section, and the original is scanned by moving the light source and the original relative to each other. Illumination scanning means for guiding the reflected light from the presented document to the light receiving surface of the reading means, and arranged in relation to the transmissive document presenting part when reading the transmissive document, and presented to the transmissive document presenting part. Transparent original Illumination means for illuminating the outside of the apparatus main body, provided in the apparatus main body, the light from the transmission-type original presentation unit and guides the light receiving surface of said reading means,
And an auxiliary scanning unit for changing the image area incident on the light-receiving surface to scan the transparent original presented on the transparent original presenting unit by the reading target area of the reading unit. .

When reading a transparent original, the transparent original is presented to a transparent original presenting section provided on the outer surface of the apparatus body. Further, an illuminating unit is arranged in association with the transmissive document presenting section, and the transmissive document is illuminated from outside the apparatus main body by the illuminating unit. Auxiliary scanning means is provided in the main body of the apparatus. The auxiliary scanning means causes the light emitted from the illuminating means and transmitted through the transmissive document to enter the light receiving surface of the reading means. At this time, the auxiliary scanning means changes the image area incident on the light receiving surface of the reading means. As a result, the scanning of the transparent original by the reading target area of the reading means is achieved, and as a result, the reading of the transparent original is achieved.

It is preferable that the auxiliary scanning means can be interposed at a predetermined position in the optical path from the normal document presenting section to the light receiving surface of the reading means when reading a transmissive document ( Claim 2). By adopting this configuration, a part of the configuration of the illumination scanning unit for reading a normal document can be used for reading a transmissive document.

Specifically, the auxiliary scanning means includes a reflecting mirror for bending the optical path of the light from the transmission type document presenting section toward the light receiving surface of the reading means, and the transmission type document presenting section. This can be realized by a configuration including a driving unit for angularly displacing the reflecting mirror along a plane including an optical path reaching the reading unit (claim 3).

[0011]

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. 1 is a simplified sectional view showing the configuration of an image reading apparatus according to an embodiment of the present invention.
(a) shows the configuration when reading a transmissive original, and Fig. 1 (b)
Shows a configuration for reading a normal document.

This image reading apparatus is used in combination with, for example, a digital copying machine, and reads an image of a document presented on a document table 31 as a normal document presenting section made of a transparent plate and corresponds to the document. It is for outputting the electric signal. The predetermined area of the document table 31
It is used as the transparent document presenting section 32. A transparent original DT such as a 35 mm film is presented to the transparent original presenting section 32.

The original table 31 is provided on the upper surface of the apparatus main body 30, and below the original table 31 is an optical system 3 as an illumination scanning means.
3 are arranged. The optical system 33 includes a light source 35 for illuminating the surface of the normal document D presented on the document table 31, a first reflecting mirror 36 for guiding reflected light from the normal document D to an image sensor 40 as a reading unit, A second reflecting mirror 37, a third reflecting mirror 38, and a lens 39 for forming an optical image of a document on the light receiving surface of the image sensor 40 are provided. The first reflecting mirror 36 is provided with the light source 35 and an arrow 41.
Is displaced back and forth along the second and third reflecting mirrors 37, 38.
Is displaced in the same direction as the light source 35 at half the speed. As a result, when the light source 35 is moved to perform illumination scanning of the normal document D, the optical path length from the light source 35 to the image sensor 40 is kept constant from beginning to end.

The image sensor 40 is composed of a one-dimensional CCD (charge coupled device) or the like, and outputs an electric signal corresponding to the optical image formed on its light receiving surface. The output signal of the image sensor 40 is input to the image processing circuit 45, subjected to predetermined image processing, and then input to an image forming unit (not shown) as image data. As the image forming unit, a unit that forms an image according to, for example, an electrophotographic process is applied. Such an image forming unit includes, for example, a photoconductor, a laser scanning unit for forming an electrostatic latent image corresponding to image data by scanning the surface of the photoconductor with laser light, and the electrostatic latent image as a toner image. Developing device for developing on, a transfer device for transferring a toner image onto recording paper,
A fixing device for fixing the toner on the recording sheet, a sheet conveying mechanism, and the like are provided.

The image reading apparatus of this embodiment includes the apparatus main body 3
An auxiliary scanning device 50 is provided in the optical axis 0 so as to be freely inserted into and removed from the optical path between the third reflecting mirror 38 and the lens 39. When the normal document D is presented on the document table 31 and is read, the auxiliary scanning device 50 is retracted to the retracted position 50A as shown in FIG. 1 (b). Reference numeral 47 is a document holder provided on the upper surface of the apparatus main body 30 so as to be openable and closable, and is not shown in FIG. 1 (a).

Transparent original DT such as 35 mm film
In reading the image, the auxiliary scanning device 50 moves to the use position 50B in response to a predetermined key input operation. This state is shown in FIG. 1 (a). Further, when reading the transmissive document DT, a projection unit 70 as an illumination unit is arranged on the transmissive document presenting section 32.
The projection unit 70 illuminates the transmissive document DT from the outside of the device body 30.

FIG. 2 is a perspective view showing the appearance of the projection unit 70. The projection unit 70 includes a horn-shaped main body 71.
And a film carrier 72 that can be slidably inserted into the main body 71. Figure 3
4 is a sectional view of the projection unit 70 along the longitudinal direction of the film carrier 72, and FIG. 4 is a sectional view of the projection unit 70 along the lateral direction of the film carrier 72. An illumination light source 74 for illuminating the transmissive document DT is arranged above the internal space of the main body 71, and a reflecting mirror 75 is attached behind it. Further, a condenser lens 76 and a sensitivity correction filter 77 are provided between the illumination light source 74 and the film carrier 72.
The condenser lens 76 condenses the light generated from the illumination light source 74 and efficiently illuminates the transmissive document DT. The sensitivity correction filter 77 is a filter for removing the characteristics of the transmissive original DT. For example, when the transmissive original DT is a 35 mm color negative film, a cyan filter or the like for removing the orange color is used.

A collar portion 71a is formed in the lower portion of the main body portion 71, and a protective glass 78 is attached to the collar portion 71a by a mounting member 79. FIG. 5A is a perspective view showing the external appearance of the film carrier 72.
(b) is an exploded perspective view thereof. Film carrier 72
Has an upper member 72U and a lower member 72D for holding the transparent original DT. The lower member 72D has a window 81
Is formed, and a diffusion plate 82 is fitted in the window 81. Further, protrusions 86, 87 for aligning the upper and lower members 72U, 72D are provided at both ends of the lower member 72D by fitting into holes 84, 85 formed at both ends of the upper member 72U. Has been. Upper member 7
In 2U, a plurality of windows 88 corresponding to each top of 35 mm are formed. Instead of fitting the diffusion plate 82 into the window 81 of the lower member 72D, the protective glass 78 described above is used.
You may use what was given the diffusion process as.

FIG. 6 is a diagram showing the structure of the auxiliary scanning device 50. FIG. 6 (a) is a front view showing a part of the structure seen from the lens 39 side of FIG. b) is a left side view showing the internal structure by cutting out, FIG. 6C is a right side view, FIG.
(d) is a plan view showing the internal structure. Auxiliary scanning device 50
In the main body 51, a rotary plane mirror 53 as a reflecting mirror for bending the optical path of the light from the transmission type document presenting section 32 toward the light receiving surface of the image sensor 40 is rotatably provided. An fθ lens 55 and a correction lens 56 (not shown in FIG. 6D) are arranged at a position facing the rotary plane mirror 53. The rotating plane mirror 53 is supported by a supporting member 57. Shafts 58 and 59 are fixed to both ends of the support member 57. The axes of these axes 58 and 59 lie in a plane including the surface of the rotating plane mirror 53. One shaft 58 is rotatably attached to the main body 51. The other shaft 59 is rotatably inserted through the main body 51, and a pulley 60 is attached to the tip end thereof. The rotating force of the plane mirror rotation motor 61 is transmitted to the pulley 60 via the pulley 62 and the belt 63. As described above, the plane mirror rotation motor 61, the pulleys 60 and 62, and the belt 63 form a drive unit for angularly displacing the plane mirror 53.

The fθ lens 55 and the correction lens 56 are attached to attachment members 64 and 65 (not shown in FIG. 6D) fixed to the inner surface of the main body 51. A magnification correction lens 66 is fixed at a position facing the lens 39 (see FIG. 1A) in the main body 51. The magnification correction lens 66 cooperates with the lens 39 to form an image of appropriate magnification on the light receiving surface of the image sensor 40. Therefore, for example, when an image of an appropriate size can be formed on the light receiving surface of the image sensor 40 by moving the lens 39 along its optical axis, it is not necessary to provide the magnification correction lens 60.

The main body 51 is connected to the shaft 68 via a pair of connecting portions 67. The shaft 68 is rotatably supported by the device body 30 of the image reading device. A drive gear 69 for inserting and removing the device is fixed to the shaft 68. The drive gear 69 meshes with a motor gear 49 attached to the drive shaft of the insertion / removal motor 48 as shown in FIG. In the above configuration, the auxiliary scanning device 50 can be angularly displaced about the shaft 68 by rotating the insertion / removal motor 48 in the forward / reverse direction. Therefore, the auxiliary device 50 can be inserted into and removed from the optical path between the third reflecting mirror 38 and the lens 39. By rotating the plane mirror rotation motor 61, the rotary plane mirror 53 is angularly displaced about the shafts 58 and 59. That is, the rotary plane mirror 53 is angularly displaced along a plane including the optical path from the transmissive original DT to the image sensor 40. As a result, the transparent original D on the plane including the light receiving surface of the image sensor 40.
The position of the optical image of T changes in the vertical direction of FIG. On the other hand, since the image sensor 40 is fixedly arranged, the image area incident on the light receiving surface of the image sensor 40 changes. As a result, scanning of the transmissive original DT by the reading target area of the image sensor 40 is achieved.

FIG. 7 is a view for explaining the optical arrangement when the normal document D is read in the state of FIG. 1 (b). The document reading area length RLN corresponds to the width of the document table 31 (the length in the direction perpendicular to the paper surface of FIG. 1), and is set to 305 mm so as to cover the short side of the Japanese Industrial Standard A row 3, for example. At this time, the lens 39 causes the line segment of 305 mm on the platen 31 to have the entire width WR (for example, 6 mm) of the light receiving surface of the image sensor 40.
7 mm).

FIG. 8 is a view for explaining the optical arrangement in the state of FIG. 1 (a). The reading area length RLT of the transmissive original DT is assumed to be 41 mm, which can sufficiently cover a 35 mm film, for example. And
The lens 39 is arranged at a position where a 41 mm line segment on the document table 31 can be projected on the entire width WR of the light receiving surface of the image sensor 40. In determining the arrangement of the lens 39, the influences of the fθ lens 55, the correction lens 56, and the magnification correction lens 66 are considered. By taking the optical arrangement as described above, the image can be read with the maximum resolution. Note that, in FIG. 8, the optical path and the arrangement of the lens 39 in the state of FIG. 1B are indicated by a two-dot chain line.

FIG. 9 is a block diagram showing a simplified electrical structure of the image reading apparatus of this embodiment. The control unit 90 including a microcomputer inside has an operation panel 91,
Light source drive unit 9 for controlling lighting of the light source 35 of the optical system 33
2, an optical motor drive unit 94 for driving the optical motor 93 for driving the optical system 33, a lens motor drive unit 96 for driving the lens drive motor 95 for displacing the lens 39 along its optical axis, and an image sensor 40. The sensor driving unit 97 for driving and the image processing circuit 45 are connected. The control unit 90 further includes an auxiliary scanning device 50.
The insertion / removal motor drive unit 98 for driving the insertion / removal motor 48 for inserting / removing the flat mirror and the flat mirror motor drive unit 99 corresponding to the flat mirror rotation motor 61 for driving the rotary flat mirror 53 in the auxiliary scanning device 50 are provided. It is connected.

When the normal document D is read in the state shown in FIG. 1B, the control section 90 turns on the light source 35, drives the optical motor 93, and causes the lens 39 to move optically as shown in FIG. The light source drive unit 92, the optical motor drive unit 94, and the lens motor drive unit 96 are controlled so that the light source drive unit 92 and the lens motor drive unit 96 are arranged at positions satisfying the arrangement. At this time, the insertion / removal motor 48 is controlled so that the auxiliary scanning device 50 is located at the retracted position 50A. Further, the plane mirror rotation motor 61 is held stationary.

On the other hand, when the operation panel 91 issues an instruction to read the transparent original DT, the light source 35 is turned off and the optical motor 93 is held in a stopped state.
The light source drive unit 92 and the optical motor drive unit 94 are arranged so that the lens 39 is arranged at a position satisfying the optical arrangement shown in FIG.
And the lens motor drive unit 96 is controlled. further,
The control unit 90 controls the insertion / removal motor drive unit 98 to energize the insertion / removal motor 48 so that the auxiliary scanning device 50 is moved to the position shown in FIG.
It is angularly displaced to the use position 50B shown in. This allows
The auxiliary scanning device 50 is provided on the optical path between the third reflecting mirror 38 and the lens 39. Further, the plane mirror motor drive unit 99 is controlled, and the rotary plane mirror 53 is reciprocally angularly displaced within a predetermined amplitude (for example, 29 degrees) range. As a result, the image area incident on the light receiving surface of the image sensor 40 changes, and the scanning of the transmissive original DT by the reading target area of the image sensor 40 is substantially achieved.
Is read. At this time, the projection unit 70 is arranged in the transmissive document presenting section 32 and illuminates the transmissive document DT from the outside of the apparatus body 30.

As described above, according to this embodiment, by providing the auxiliary scanning device 50 in the main body 30 of the image reading device, a large-scale projection device for enlarging and projecting an image on the document table 31 is installed. The image of a transmissive original can be read without performing the above operation. Therefore, the image of the transmissive original DT can be read by an extremely simple operation. Moreover,
The projection unit 70 used for reading the image of the transmissive original DT does not include a configuration for magnifying projection,
As can be seen from FIGS. 2, 3 and 4, the structure is extremely simple. Therefore, since it is relatively small, it does not require a large space for its storage.

Further, in the structure of this embodiment, the optical path length from the original to the light receiving surface of the image sensor 40 is shorter when the transmissive original DT is read than when the normal original D is read. Therefore, a clear optical image of the transmissive original DT can be formed on the light receiving surface of the image sensor 40, so that highly accurate image reading can be performed. Further, since the auxiliary scanning device 50 is interposed so as to interrupt the middle of the optical path when reading the normal document D when reading the transmissive document DT, a part of the optical system 33 for reading the normal document D is provided. The structure can also be used for reading the transparent original DT. As a result, simplification of the configuration and cost reduction are achieved.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments. For example, in the above-described embodiment, when reading the normal document D, the document D is held stationary and the optical system 33 is used.
The scanning of the document D is achieved by driving the. However, the present invention can also be applied to an apparatus having a configuration in which an optical system for reading an image is held stationary and an original is conveyed to scan the original. Such an apparatus generally includes a slit-shaped document presenting section, and an optical system is fixedly arranged in relation to the document presenting section. When the present invention is applied to such an apparatus, a transparent document presenting section is provided on the outer surface of the apparatus body separately from the ordinary document presenting section, and the transparent document presenting section is provided inside the apparatus body. It is sufficient to provide an auxiliary scanning unit that guides light to the light receiving surface of the reading unit such as an image sensor and changes the image area every second to scan the transmissive original by the reading target region of the reading unit.

Further, in the above-mentioned embodiment, the structure using the rotary reflecting mirror which bends the optical path of the light from the transmission type document presenting section is adopted as the auxiliary scanning means, but the auxiliary scanning device having another structure is adopted. It may be used. For example, a rotating prism can be used instead of the rotating reflecting mirror. Further, it is possible to adopt a configuration in which a holding member for holding the transmissive original is provided and the image area incident on the light receiving surface of the reading unit is changed by displacing the holding member.

Further, in the above embodiment, the structure in which the image is read by the image sensor and the image data is generated has been described. However, the present invention is applicable to an analog copying machine which is not provided with the image sensor or the structure for generating the image data. Can be applied. That is, in the case of an analog copying machine, the light to be incident on the image sensor is guided to the photoconductor to directly form an electrostatic latent image on the photoconductor. In this case, the photoconductor and the structure related thereto correspond to the reading unit.

In addition, various design changes can be made without changing the gist of the present invention.

[0033]

As described above, according to the image reading apparatus of the present invention, the transparent original is presented to the transparent original presenting section provided on the outer surface of the apparatus main body, and the transparent original presenting section is provided. By arranging the illumination means, it is possible to read a transmissive original. That is, a large-scale projection device for projecting a magnified image of the transmissive document is not required, and the illumination unit having a very simple structure may be arranged in the transmissive document presenting section.

Thus, the transparent original can be read by a simple operation. In addition, since the lighting means can have a simple structure, it does not increase in size. Therefore, no large storage space is required for the lighting means. Further, if the auxiliary scanning means can be arranged at a predetermined position in the optical path from the normal document presenting section to the light receiving surface of the reading means when reading the transmissive document, the illumination for reading the normal document is provided. A part of the structure of the scanning means can be used for reading a transparent original. Thereby, the configuration can be simplified and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a sectional view showing a simplified internal configuration of an image reading apparatus according to an embodiment of the present invention. (a) shows the configuration when reading a transparent original, and (b) shows the configuration when reading a normal original.

FIG. 2 is a perspective view showing an appearance of a projection unit.

FIG. 3 is a vertical sectional view of a projection unit.

FIG. 4 is a cross-sectional view of the projection unit.

FIG. 5 is a perspective view showing a configuration of a film carrier.
(a) is a perspective view showing the external appearance, and (b) is an exploded perspective view.

6A and 6B are diagrams showing a configuration of an auxiliary scanning device, in which FIG. 6A is a front view showing a partial cutaway of the internal configuration, FIG. 6B is a right side view showing a partial cutaway of the internal configuration, and FIG. ) Is a left side view, and (d) is a plan view showing the internal structure.

FIG. 7 is a diagram for explaining an optical arrangement when reading a normal document.

FIG. 8 is a diagram for explaining an optical arrangement when reading a transmissive original.

FIG. 9 is a block diagram showing an electrical configuration of the image reading apparatus.

FIG. 10 is a simplified cross-sectional view showing a typical prior art configuration.

[Explanation of symbols]

 30 Device Main Body 31 Document Plate 32 Transmissive Document Presenting Unit 33 Optical System 35 Light Source 39 Lens 40 Image Sensor 45 Image Processing Circuit 48 Insertion / Extraction Motor 50 Auxiliary Scanning Device 53 Rotating Plane Mirror 61 Plane Mirror Rotation Motor 69 Insertion / Extraction Drive Gear 70 Projection Unit

Claims (3)

[Claims] 1. An apparatus main body, a normal document presenting section provided on an outer surface of the apparatus main body for presenting a normal original, which is an original having an image formed on a light-shielding carrier, and the apparatus main body. A transmissive original document presenting section for presenting a transmissive original document, which is an original document having an image formed on a translucent carrier, is provided on the outer surface, and an optical element which is provided inside the apparatus body and is incident on the light receiving surface. A reading unit for reading an image and a light source provided in the main body of the apparatus for illuminating a document presented to the normal document presenting section are included, and the document is scanned by moving the light source and the document relatively. In addition, an illumination scanning unit that guides the reflected light from the document presented to the normal document presenting unit to the light receiving surface of the reading unit, and is arranged in association with the transmissive document presenting unit when reading the transmissive document, Presentation of the transparent manuscript And an illumination means for illuminating the transparent original presented from above from the outside of the apparatus main body, and a light provided from inside the apparatus main body for guiding the light from the transparent original presenting section to the light receiving surface of the reading means. An image including: an auxiliary scanning unit that achieves scanning of the transmissive document presented in the transmissive document presenting unit by the reading target region of the reading unit by changing the image region incident on the light receiving surface. Reader. 2. The auxiliary scanning means can be interposed at a predetermined position in the optical path from the normal document presenting section to the light receiving surface of the reading means when reading a transmissive document. The image reading device according to claim 1. 3. The auxiliary scanning means includes a reflecting mirror for bending an optical path of light from the transmissive document presenting section toward a light receiving surface of the reading means, and the transmissive document presenting section to the reading means. 3. The image reading apparatus according to claim 1, further comprising drive means for angularly displacing the reflecting mirror along a plane including an optical path to reach.