JP4360940B2 - Image reading device - Google Patents

Description

  The present invention relates to an image reading apparatus that is used in a scanner, an image input device, a copying machine, and the like, reads an image recorded on a document, and obtains an image signal representing the image.

  Conventionally, when an image recorded on a document is read and an image signal is acquired and the acquired image signal is converted into electronic data of a predetermined format, or when an image recorded on a document is read and a copy image is created The image signal representing the image recorded on the document is acquired using the image reading apparatus.

  In that case, the reading surface of the original is placed on a flat platen glass, light is irradiated to the reading surface from a light source moving at a certain distance below the platen glass, and reflected light reflected from the reading surface. The image signal is obtained by forming an equal-magnification erect image by the image sensor on the light receiving surface of the image sensor, or the original is placed on an automatic sending device, for example, and fed out one by one, and from a light source fixed at a predetermined position In general, an image signal representing an image recorded on a passing document is acquired by reflected light of light applied to the reading surface.

  Further, in creating a copy image, it is necessary to accurately read the original with a high-resolution image sensor because of a request to faithfully reproduce the original on which high-definition characters are recorded.

  However, when an image signal is obtained by reading an image recorded in a book in which a plurality of pages of originals are bound, the book is turned over and the reading surface is brought into close contact with the platen glass, and the like on the light receiving surface of the image sensor. It is necessary to form a double erect image. Further, when reading over a plurality of pages, it is necessary to turn over the reading surface after turning the pages one by one, so that the reading efficiency is poor and the book may be damaged. Furthermore, for thick books, it is difficult to read even if they are pressed strongly against the platen glass, and the reproduced image reproduced by the acquired image signal is black in the vicinity of the binding portion or the image is distorted and difficult to see. There is.

  In view of this, a method for reading a document with its reading surface facing upward has been proposed.

  For example, an area sensor such as a two-dimensional CCD is mounted so as to be able to swing freely, a document surface to be read is divided into a plurality of areas, and an image of the entire document is obtained by joining the divided captured images. Are known. However, since it is impossible to focus the entire photographed image when the original surface is taken close-up, the original surface is divided into a plurality of areas, and based on the positional relationship between the imaging optical system and the original image. Among the divided areas, a proposal has been made to obtain a focused usable area, cut out the usable area from the photographed image, and paste it together to improve the joining accuracy and ensure good image quality ( Patent Document 1).

  In addition, in an image reading apparatus that shoots with the document facing upward, the cutout area is externally set to enable the image to be zoomed out by specifying the read area or to check the image when the layout is changed and pasted. There is one that can output to an apparatus (see Patent Document 2).

  Further, when photographing a plurality of subjects at different distances using an electronic camera, a method of focusing by performing so-called tilt correction, in which the optical axis on the image plane of the film and the optical axis of the imaging lens are shifted. In this case, it is possible to check which part of the imaging range is in focus by processing the image data by electronically correcting the tilt (see Patent Document 3). ).

  On the other hand, in video conferencing systems that perform video communication, etc., when sending and receiving still images such as documents at the same time as video, it is difficult to recognize characters because of the low resolution. Has improved operability and versatility by using an I / O device for still images (see Patent Document 4).

In addition, since it is difficult to capture an A4 size document at a time with a digital camera, there is a fax signal processing circuit that can capture text data and can transmit and receive facsimile data. (See Patent Document 5).
JP-A-10-210272 Japanese Patent Laid-Open No. 10-327312 JP 2000-13665 A JP-A-7-111644 Japanese Patent Laid-Open No. 10-257364

As described above, when reading with the document surface facing upward, a method using an area sensor or an electronic camera with a built-in area sensor is generally employed.

  As the area sensor, the number of pixels in one line cannot be increased so much as compared with the linear sensor, and therefore, those having hundreds of thousands to millions of pixels are often used. For this reason, a high resolution can be obtained when the shooting area is small. On the other hand, when the shooting area is widened, the roughness of the pixels is conspicuous, and the resolution cannot be improved even if the data is supplemented electronically.

  On the other hand, an area sensor is effective in capturing an entire image of a large subject and grasping its outline.

Therefore, in order to shoot a still image such as a document and a person or a moving image using only the area sensor, the document is divided into an appropriate size to obtain a predetermined resolution, and the divided areas can be compared with each other. It is necessary to secure the resolution for the document by pasting them together. For this reason, in the methods disclosed in Patent Literature 1 and Patent Literature 2, software is required when pasting the segmented regions that are photographed by dividing the region, so that the pasting process takes time. There is a drawback that the resolution is not so good due to the use of the area sensor. Further, the method disclosed in Patent Document 2 requires a table on which a document is placed and a device overlooking the reading surface, and the size of the entire device is too large to read the document by placing the device on a desk. There are difficulties. Furthermore, if the technique disclosed in Patent Document 3 is used, the entire apparatus can be reduced in size. However, with this technique, even if the reading surface is divided and each area is sequentially focused, Since processing for pasting image data obtained each time by software processing remains, the processing takes time and image quality deterioration factors caused by pasting cannot be completely eliminated.
On the other hand, the method using the facsimile for improving the resolution is effective for a material capable of disassembling the original one by one, but when the image described on the predetermined page of the book is captured, the page is copied. A similar problem arises in doing so and cannot be a solution.

  In view of the above circumstances, the present invention uses an area sensor and a linear sensor separately to increase the resolution at the time of reading a document, shorten the reading time, and can shoot a general subject such as a person, and is portable. It is another object of the present invention to provide an image reading apparatus that can be read and photographed on a desk and can be used as a communication tool.

An image reading apparatus of the present invention that achieves the above object is an image reading apparatus that has an interface with the outside and obtains an image signal by capturing a light image representing a document or a subject with a solid-state image sensor.
A document reading unit that scans light irradiating the document and captures an image signal reflected by the document with a one-dimensional solid-state imaging device;
A subject imaging unit that captures a light image of a subject with a two-dimensional solid-state imaging device to obtain an image signal;
The document reading / reading unit measures the height of each position of the document scanned by the light in response to the non-planar being selected by an operator for selecting whether the document is planar or non-planar. The optical image is focused on the basis of the height of each position of the original document, and is picked up by the one-dimensional solid-state image sensor.
An image reading apparatus of the present invention includes a document reading unit that scans light on a document and obtains a high-resolution image signal by a linear sensor, and a digital camera that captures an image of a general subject instantaneously by an area sensor. Since it is provided, it can be used for a wide range of applications with a single unit by properly using it according to the purpose. In addition, an image signal read by providing a detachable memory or an image display unit can be stored in the memory, displayed on a monitor, and input / output with an external device can be performed. Further, the document reading unit measures the height of the reading surface of the non-planar book that is opened upward, and automatically adjusts the optical system based on the height of the reading surface to obtain a focused optical image on the one-dimensional image sensor. Since the image is formed, the book opened upward can be read as it is to obtain an image signal. The image distortion generated in that case can be corrected by moving an aspherical mirror having different reflection characteristics depending on the reflection position in accordance with the scanning of the reading light.
An image reading apparatus of the present invention that achieves the above object is an image reading apparatus that has an interface with the outside and obtains an image signal by capturing a light image representing a document or a subject with a solid-state image sensor.
A vertical wall surface having a window at the top, and a housing having a side surface that intersects with the wall surface and has a width smaller than the height of the wall surface;
A subject imaging unit that is slidably supported and movably supported in the housing, and obtains an image signal by capturing a light image of the subject with a two-dimensional solid-state imaging device;
A document reading unit that is housed in the housing and scans the light irradiated on the document and captures an optical image reflected by the document with a one-dimensional solid-state imaging device to obtain an image signal;
An audio unit that is housed in the housing and has audio input means for converting audio into electrical signals; and audio output means for converting electrical signals into audio; and
An image display that is slidably supported in the housing and is movably supported, performs image processing on any one of the image signals obtained by the document reading unit and the subject imaging unit, and displays the document or the subject on a monitor. And a section.

  In the image reading apparatus of the present invention, an original reading unit having a linear sensor is accommodated in a casing having a vertical wall surface having a window portion on the upper side and a side surface having a small width, so that the image reading device can be placed anywhere. The document can be carried or read on a desk, and the read document can be displayed on a monitor. In addition, a person image or the like can be taken and displayed on a monitor screen from a camera having an area sensor and a photographing lens that is freely movable, and audio can be sent from a speaker. In addition, the distortion of the optical image that occurs when light is emitted obliquely from the window on the wall surface, the scanning light is scanned on the original, and the reflected light is received by the linear sensor to obtain an image signal is reflected depending on the position. By moving the aspherical mirror whose characteristics change in accordance with the scanning of the reading light, reading with low image distortion and high resolution is possible. Prior to scanning with reading light, the height of each position on the reading surface is measured, so that the reading surface is not only a flat original but also a curved original with a binding portion like a book. However, it is possible to read with the curved surface facing upward. In addition, by using an input / output terminal connected to an external device or the like, a removable memory, an interface with a network, etc., it can be used as a communication tool for remote places or a recording tool such as an image.

  The image reading apparatus according to the present invention includes a document reading unit having a linear sensor, a subject imaging unit having an area sensor, and the like, which can be used properly according to the object to be read and can be used at the same time. Image signals can be obtained. Further, since the original scans the original with the light emitted from the oblique direction, the book opened upward can be read by measuring the height of the reading surface in advance.

  In addition, since the document reading unit is housed in a casing having a vertical wall surface and a side surface having a small width, the entire image reading apparatus can be configured to be thin, so that it can be placed on a desk and placed on a desk. It can be read from the side of a book or carried to a required place.

  Furthermore, by using an input / output terminal connected to an external device or the like, a detachable memory, an interface with a network, etc., it can be used as a communication tool for remote places and a recording tool such as an image.

  Embodiments of an image reading method of the present invention and an image reading apparatus of the present invention will be described below. Since the image reading method of the present invention is used in the embodiment of the image reading apparatus of the present invention, the embodiment of the image reading method of the present invention will be described together with the embodiment of the image reading apparatus of the present invention. To do.

  FIG. 1 is a schematic external view showing an embodiment of an image reading apparatus of the present invention.

  The image reading apparatus according to this embodiment shown in FIG. 1 is accommodated in a box-shaped housing 1 having a small thickness. The housing 1 includes a wall surface 2 that forms a front surface and a back surface, both side surfaces 3 that intersect the wall surface 2 at a right angle, an upper surface 4, and a bottom surface 5. In the present embodiment, the wall surface 2 and both side surfaces 3 of the housing 1 are perpendicular to the document reading surface, but at least the front wall surface 2 is perpendicular to the side of the document because it is necessary to be arranged parallel to the document. The rear wall surface and both side surfaces 3 are not necessarily perpendicular to the document reading surface.

  Further, the housing 1 of the image reading apparatus according to the present embodiment is configured to be thin by reducing the width of the side surface 3 so that it can be used on a desk or carried. The width of the wall surface 2 can be arbitrarily set according to the purpose, but it is an A4 size horizontally placed manuscript or book (or A3 size vertically placed manuscript or book. However, in the case of a book, a binding portion is used. Is preferably arranged so as to be parallel to the wall surface 2.

  A corner where the front wall surface 2 and the upper surface 4 intersect has a notch portion, and a digital camera (corresponding to a subject imaging unit of the present invention) 12 fitted to the notch portion is movable on the upper surface 4. It is supported freely.

  An upper portion of the front wall surface 2 is provided with a window portion (opening) 6 through which reading light for reading a document is emitted and reading light reflected by the reading surface is incident. It is covered with glass to protect the dust from entering and the optical equipment that is housed. Further, the front wall surface 2 and the upper right part are provided with a window part 7 from which measurement light is emitted, and the central upper part is provided with an AE sensor window part 8 for detecting the brightness of the reading surface of the document. In the lower left part, a speaker for outputting sound is provided.

  A reading light source 20 and a rotating mirror 21 are provided at a position visible from the window inside the housing.

  Further, the image reading apparatus of the present embodiment includes an image display unit 9 configured by a liquid crystal panel that displays on a monitor an image recorded on the document read by the document reading unit.

Furthermore, operation buttons 10 that are operated by an operator in image reading by the image reading apparatus of the present embodiment are provided on the lower and upper portions of the image display unit 9 and the side surface 3 of the housing 1. Is provided with a microphone 14 for converting sound into an electrical signal.
As the operation buttons 10, a document selection button for selecting whether the document to be read is a flat reading surface or an uneven book, a designation button for designating the size of the document, and an aspherical mirror are set at the reading start position. There is an initial setting button.
Since the image display unit 9 is fixed to the side surface 3 through a hinge, when not in use, the image display unit 9 is pressed against the wall surface 2 and stored, and when reading a document, the display unit 9 is caused as shown in FIG. Can be monitored.

Note that there are a plurality of openings on the side surface 3 and the back surface that do not appear in the drawing of the image reading apparatus, and in the openings, a memory interface for attaching / detaching a memory for storing an image signal, an electric signal converted by a microphone, and the like. An output terminal, an input terminal for inputting an electrical signal for audio from the outside, an input terminal for an image signal, and an output terminal are provided.
The image reading apparatus according to the present embodiment is a digital camera that captures an image of a general subject and obtains an image signal, as well as an original having a flat reading surface and a binding portion such as a book and having an uneven surface. In any case, an original reading unit is provided that optically reads an image recorded on the reading surface and obtains an image signal representing the image with the reading surface facing upward.
Therefore, pick up and record the sound when the subject is photographed with a digital camera with a microphone, display the photographed subject and the image of the reading surface on the image display unit, and output the externally input sound signal from the speaker. In addition, an externally input image signal can be displayed on the monitor on the image display unit.
It also has a vertical wall surface and side surfaces so that it can be placed on a desk to shoot a portrait and read a document placed aside, so that the wall surface is parallel to the document. An image reading apparatus is disposed, and the document is irradiated with reading light from obliquely above, and the image is read by scanning the reading light. Furthermore, the width dimension of the side surface of the housing can be made smaller than the height dimension of the wall surface so that the entire image reading apparatus can be made thin.
Further, the document reading unit of the present embodiment selects whether to read a flat document such as a document or a non-planar document with a book opened upward by operating the operation button 10. When a flat document is selected, the lens position in the imaging optical system is programmed in advance in accordance with the document size and the reflection position of the scanned reading light. On the other hand, when a non-planar document is selected, a slit-shaped measurement light source is irradiated so as to cross the document in the scanning direction, and the height from the reference plane at each position in the scanning direction is measured. Based on the above, the pre-programmed lens position is corrected. In addition, general image distortion caused by scanning oblique light on a document is caused by moving an aspherical mirror having different reflection characteristics depending on each position in the scanning direction in accordance with the scanning of oblique light, and moving the aspherical mirror to a predetermined position. The image distortion is optically corrected by reflecting the image, and for a non-planar document, distortion correction is performed on the read image signal according to the result of measuring the height of each position in the scanning direction of the document.
2 and 3 are schematic views showing the digital camera of the present embodiment.

  As shown in FIG. 2, the digital camera 12 according to the present embodiment includes an arm 12d and a support portion 12a, and the arm 12d is pivotally supported at a corner cutout portion 4a where the front wall surface 2 and the upper surface 4 intersect. Has been. The support portion 12a supports the photographing lens 12b and the strobe 12c, and is locked to the arm 12d so as to be rotatable in the arrow A direction and the B direction.

  Therefore, when the digital camera 12 is used, the arm 12d can be pulled out from the cutout portion 4a and the support portion 12a can be rotated to direct the photographing lens 12b and the flash 12c in a predetermined direction. A predetermined subject can be photographed simultaneously with reading the document. Further, when not in use, the support portion 12a is returned to its original state, and the arm 12d can be fitted into the cutout portion 4a and stored in the housing 1, so that it is easy to carry.

  FIG. 4 is a schematic view showing a document reading unit housed in a housing when the image reading apparatus of the present embodiment is viewed from the side.

  As shown in FIG. 4, the document reading unit of the present embodiment is housed in a housing 1, and the housing 1 is provided with a window 6 on the side of a document 100 arranged with the reading surface facing upward. The front wall surface 2 is arranged in parallel with one side of the reading surface of the document. Note that the window 6 has an opening large enough to allow light reflected at a position closest to the wall surface 2 of the reading surface of the document 100 to enter the housing 1.

  In the housing 1, an original reading unit is configured in the order of the reading light source 20, the rotating mirror 21, the aspherical mirror 22, the reflecting mirror 23, the lens 24, and the one-dimensional solid-state imaging device 25 from the upper side of the housing 1. The reading light source 20 and the rotary mirror 21 are arranged at positions that can be seen from any position on the reading surface of the document 100.

  For example, the reading light source 20 has light emitting elements arranged in a line and emits elongated reading light in the width direction of the wall surface 2 from the oblique direction through the condenser lens. Is supported by a rotary shaft 20a provided horizontally. Accordingly, the reading light is irradiated in the width direction of the reading surface from the window portion 6 toward the reading surface, while the reading surface is line-sequentially formed by the long and narrow reading light irradiated with the rotation of the rotating shaft 20a. For example, it is possible to scan in the arrow X direction.

  Here, when the document is a book, the reading light is made the same in the width direction of the reading surface by arranging the housing 1 so that the binding portion of the book and the wall surface 2 of the housing 1 are parallel to each other. Irradiation can be performed under conditions.

  The rotating mirror 21 is a planar reflecting mirror, and is pivotally supported on both side surfaces of the housing 1 by a rotating shaft (not shown) provided below the rotating shaft 20a of the reading light source and in parallel with the rotating shaft 20a. . Since the reading light source 20 is configured to rotate in accordance with the rotation, when the reading surface is scanned by the reading light, it is irregularly reflected at each position of the scanned reading surface and from the window portion 6. The direction of the reading light incident on the rotating mirror 21 at a predetermined angle can be changed downward in the wall surface 2. Accordingly, the one-dimensional imaging element 25 can capture reflected light corresponding to the image recorded at each position, which is reflected at each position on the reading surface by scanning the reading light.

  The aspherical mirror 22 has a role of optically avoiding image distortion due to a difference in distance until the reading light reflected at each position on the reading surface is reflected by the rotating mirror 21.

  The reading light source 20 of the present embodiment is configured to irradiate light from an oblique direction with respect to the reading surface and scan the irradiated light. Accordingly, as shown in FIG. 5A, the reading light 110 is irradiated from the oblique direction of the rectangular document surface AB, and the reading light 120 reflected by the document surface AB is rotated in the vicinity of the reading light emission position. After being reflected by the mirror 21, the optical image captured by the one-dimensional imaging device 25 after being focused by the lens 24 through the aspherical mirror 22 has different shooting distances on the front side B and the hand side A of the document surface. . For this reason, the image magnification is different between the front side B and the hand side A of the document surface, and the rectangular document surface AB shown by the solid line shown in FIG. 5B is distorted as shown by the broken line in the figure. It is caught by. That is, when the shooting distance is long, the one-dimensional image sensor 25 captures the image as a reduced image.

  Therefore, the aspherical mirror 22 of the present embodiment is designed to be installed on the wall surface 2 of the housing 1 so as to be movable up and down and to change the reflection characteristics in the vertical direction.

  That is, since it is necessary to enlarge when the shooting distance is long, a concave surface is formed, and when the shooting distance is short, a convex surface is formed on the contrary. Then, the reflection position of the reading light reflected by the rotating mirror 21 and incident on the aspherical mirror 22 moves according to the reflection position of the reading light on the reading surface, and the image distortion is corrected. 22 is configured to move up and down in accordance with the rotation of the rotating mirror 21. A mechanism for interlocking the rotating mirror 21 and the aspherical mirror 22 will be described later.

  Here, although one aspherical mirror 22 that moves up and down is used, the number of aspherical mirrors 22 is not necessarily one, and a plurality of aspherical mirrors 22 may be used. Further, the aspherical mirror 22 is not necessarily limited to correcting the image magnification, and may be used to correct distortion due to other factors.

  The lens 24 forms an optical image of the reading light reflected by the aspherical mirror 22 on the light receiving surface of the one-dimensional solid-state image sensor 25.

Here, the lens 24 of the present embodiment is normally programmed so that the lens position is focused in conjunction with the rotating mirror 21 and the aspherical mirror 22. And when reading a book with irregularities on the reading surface upward, a lens that is programmed based on the height of each position of the reading surface obtained by the height measuring unit described later, which is performed prior to reading the document. The position is corrected. The lens 24 can be configured by a zoom lens having a variable focal length, and the zoom magnification can be set in a plurality of stages.
However, in that case, if the focal length of the lens is out of the predetermined range, the image distortion cannot be corrected with only the aspherical mirror 22, so that the image signal obtained by imaging with the one-dimensional solid-state imaging device is used. A predetermined distortion correction is performed by an image processing circuit to be described later.

  The one-dimensional solid-state imaging device 25 outputs an image signal according to an optical image (light quantity distribution) of an image formed by the lens 24 and recorded at each position on the reading surface.

  Here, as the one-dimensional solid-state imaging device 15, for example, a linear CCD or a line sensor in which a photosensitive portion and a transfer portion are arranged in a line can be used.

  Thereby, it is possible to obtain a higher resolution image signal than in the case of using an area sensor.

  When the operation button 10 provided on the side surface 3 of the casing of the image reading apparatus according to the present embodiment is pressed, light is emitted from the reading light source 20 and is read by the narrow reading light 110 that extends in the width direction of the wall surface of the casing. While the reading surface is irradiated, the irradiated reading light is scanned in the arrow X direction. The reading light 120 reflected by the reading surface is incident on the rotating mirror 21 and further reflected by a portion having a predetermined reflection characteristic of the aspherical mirror 22, and the fluctuation and linearity of the image magnification due to the reflection position of the reading light are corrected, The light enters the lens 24. Since the lens 24 is set in advance so that the lens 24 is focused in accordance with the scanning of the reading light, the optical image of the reading light reflected by the reading surface is focused on the one-dimensional solid-state imaging device 25. Received light.

  FIG. 6 is a schematic functional block diagram of the image reading apparatus according to the present embodiment.

  As shown in FIG. 6, the image reading apparatus according to the present embodiment reads an original on which a scanning light scanned on the original is imaged on a one-dimensional solid-state imaging device (one-dimensional CCD) by an imaging optical system. A digital camera 12 that obtains an image signal by forming a light image of a subject on a two-dimensional imaging device (two-dimensional CCD) with a photographing lens, a microphone 14 that inputs sound, and a reading light source to scan scanning light In addition, a scan motor (corresponding to the drive unit of the present invention) 31 that drives the rotating mirror and the aspherical mirror in accordance with the scanning, a scan motor drive circuit 32 that controls the rotation of the scan motor 31, and an aspherical mirror A sensor 28 that detects the movement position of the attached cam and transmits it to the motor drive circuit 32, a reading light source 20 that emits reading light, and a reading light source driving circuit 33 that rotates the reading light source 20. A lens mechanism 34 for freely changing the lens position of the image forming optical system, a zoom / AF motor drive circuit 35 for moving the zoom lens by driving the lens mechanism 34, or focusing according to a program, an image forming optical system The one-dimensional CCD element (in this case, a one-dimensional CCD element is used as a one-dimensional solid-state imaging element) 25 and the electric charge based on the optical image by the photographing lens are accumulated. Two-dimensional CCD element (here, a two-dimensional CCD element is used as a two-dimensional solid-state imaging element) 25, a one-dimensional CCD element, and a CCD drive circuit 36 that reads out charges accumulated in the two-dimensional CCD element at a predetermined timing. Performs gain control and band compression / expansion of image signals read from 1D and 2D CCD elements An image processing circuit 37 (corresponding to an image processing unit of the present invention) 37, an image signal processed by the image processing circuit 37, and a fixed memory 38a for storing in-focus positions of the imaging optical system at each position on the reading surface; The image signal band-compressed by the circuit 37 or the image signal band-compressed by an external device is stored. The detachable mobile memory 38b and the electric signal obtained by the microphone 14 are amplified and noise-removed. A voice processing circuit 43, an AF floodlight lamp (corresponding to a height measuring unit of the present invention) 39 that measures the height of each position on the reading surface from the reference surface, and an AE light receiving element (this book) that measures the brightness of the reading surface (Corresponding to the photometric part of the invention).

Further, the image processing circuit 37 includes a document image processing circuit 37 a that performs processing such as gamma correction and edge enhancement on the image signal obtained by the document reading unit 18, and gamma correction on the image signal obtained by the digital camera 12. A camera image processing circuit 37b for performing color adjustment and the like.
Further, the operation panel 41 for sending a predetermined command to the image reading device by operating the operation button 10, the image signal for capturing the subject, the image signal for capturing the original, or the externally input signal or the movement memory 38b. An image display unit 9 that monitors and displays an image signal whose band is expanded by the image processing circuit 37, a speaker 13 that outputs sound, and an audio electrical signal obtained by the microphone 14 are output to the outside, or the image processing unit 37 An external output terminal 42a for outputting the processed image signal, an external input terminal 42b for inputting an image signal obtained by an external device or an electrical signal of sound, and an image signal to be displayed on the image display unit 9 on an external monitor screen In addition to having an external monitor terminal 45 for display, it has a built-in modem and DSU, and is band-compressed with an external device via a network And a communication interface 46 for transmitting and receiving electrical signals of the image signals and audio.
Here, the external input terminal 42b and the external output terminal 42a may be USB (Universal Serial Bus) or SCSI (Small Computer System Interface).
Each circuit and each mechanism are controlled by the CPU 50.
Here, the reading light source 20 can adjust and output the intensity of the reading light based on the measurement result by the AE light receiving element 40. Further, according to each position in the scanning direction on the reading surface, for example, the AF light projection lamp 39 is turned on so that the average brightness at the time of imaging with the one-dimensional CCD element 25 is made uniform. Based on the electrical signal acquired by the one-dimensional CCD element 25 at the time of measurement, the intensity of the read light to be emitted can be adjusted and the scanning speed of the read light can be adjusted.
The image processing circuit 37 has a correspondence table between zoom magnifications and correction constants of the zoom lens in the lens mechanism 34. When the focal length deviates from a predetermined range depending on the setting of the zoom magnification, the image processing circuit 37 is a one-dimensional CCD element. The distortion correction can be performed on the electrical signal acquired by imaging at 25 using the correspondence table. Further, based on the height obtained by the height measurement, the electrical signal obtained by imaging with the one-dimensional CCD element 25 is corrected.
Further, the operation panel 41 has buttons 10a for turning on / off image signals and audio electrical signals input / output from / to the external output terminal 42a and the external input terminal 42b, and turning on / off the document reading unit 18 and the digital camera 12. , A button 10b for switching between the image display unit 9 and the external monitor terminal 45 to display an image signal on one of them, a selection button 10c for selecting whether a document read by the document reading unit is in a flat state or a non-planar state, an aspherical mirror Are set at the reading start position, a button 10e for designating an image capturing range, a shutter button 10f for photographing a still image of a subject or a document, and other buttons for various settings.
When photographing a subject such as a person image with the digital camera 12, the digital camera 12 is turned on by the button 10 a of the operation panel 41. A subject photographed by the photographing lens of the digital camera 12 is imaged by the two-dimensional CCD element 25, read by the CCD drive circuit 36, and displayed on the image display unit 9. The image signal that has been band-compressed by the image processing circuit 37 and temporarily stored in the fixed memory 38a can be transmitted from the communication interface to an external device via a network. If necessary, when the shutter button 10f is pressed, the image signal that has been subjected to image processing at that timing and subjected to band compression is stored in the moving memory 38b. In this case, the subject is displayed on the external monitor by switching to the external monitor terminal 45 instead of the image display unit 9 by the button 10b.

  Next, when one side of the document is placed in parallel on the wall surface of the housing, the document reading unit 18 is turned on by the button 10a, and the plane state is selected by the selection button 10c, the CPU 50 turns on the reading light source 20, The scanning motor 31 is driven to rotate and scans the original with reading light, and the reading method reflected at each position on the reading surface of the original is linked to the one-dimensional CCD element by linking the rotation of the rotary mirror and the movement of the aspherical mirror. Make an image. The image signal obtained by the one-dimensional CCD element is subjected to image processing by the image processing circuit 37 and temporarily stored in the fixed memory 38a. In this case, the monitor of the digital camera can be turned off and the monitor image of the document can be displayed on the image display unit 9. In addition, the original can be copied onto a sheet by a copying machine connected to the external output terminal. Further, it can be transmitted from the communication interface to an external device via a network.

  Further, in the case of a book or the like in which a document to be read is opened upward, when a non-planar state is selected by the selection button 10c, a measurement light source (AF flood lamp) 39 for measuring the height is turned on, and a rotating mirror, The aspherical mirror and the imaging lens perform predetermined operations, the reflected light at each position of the reading surface by the measurement light source 39 is received, and a reference position (for example, the reading surface when the reading surface is flat) (for example, the reading surface) Deviations from the position where the measurement light is obliquely traversing the reading surface is irradiated on the reference surface), and the height of each position on the reading surface is obtained based on the deviation. In that case, the scan motor drive circuit 32 drives the scan motor at a predetermined rotational speed. The zoom / AF motor drive circuit 35 drives the lens mechanism 34 as programmed in advance. On the other hand, the CCD drive circuit 36 drives the one-dimensional CCD element 25, and the image processing circuit 37 accumulates an image signal read from the one-dimensional CCD element 25 in a memory at a predetermined timing.

  Based on the height of each position of the reading surface thus detected, the CPU 50 corrects the lens position programmed in advance. Then, based on the lens position corrected by the CPU 50, charges from the reading light irradiated and scanned from the reading light source 20 are accumulated in the one-dimensional CCD element 25. The accumulated charge is read out, and the acquired image signal is subjected to predetermined image processing by the image processing circuit 37 and stored in the memory 38a. The image processing circuit 37 performs a predetermined correction on the image signal stored in the memory 38a based on the height of each position on the reading surface measured by turning on the AF floodlight 39.

  As for the corrected image signal, the monitor image of the document can be displayed on the image display unit 9 as in the case where the plane state is selected by the button 10c. In addition, the original can be copied onto a sheet by a copying machine connected to the external output terminal. Further, it can be transmitted from the communication interface to an external device via a network.

  FIG. 7 is a diagram illustrating a usage example of the image reading apparatus of the present embodiment.

In the image reading apparatus shown in FIG. 7, a personal computer (hereinafter abbreviated as “PC”) 100 is connected to an external output terminal. An original is placed parallel to the wall surface 2 of the housing, and the arm 12d of the digital camera 12 is pulled out until it is perpendicular to the wall surface 2, and the support lens 12b is rotated in the direction of arrow A so that the photographic lens 12b is positioned on the side surface. It is oriented in three directions.
The document reading unit and the digital camera 12 are turned on by a button 10a on the operation panel. A person photographed by the digital camera 12 is displayed on the image display unit 9, and an image read by the document reading unit is displayed on the PC 100 connected to the external output terminal. The state of the displayed image can be confirmed and stored in the moving memory.
Although a human image is taken with the digital camera 12 here, it is also possible to take a photograph or graphic posted on a part of the document with the photographing lens 12b of the support portion 12a facing downward.
Accordingly, the original reading unit is used for black and white images, the digital camera 12 is used for color images, and the color images are captured by the digital camera 12 and stored in the memory. Aside from the black and white document image read by the reading unit, it can be connected to a PC to perform color reproduction, and color printing can be performed by a color printer connected to the PC.
Next, an example will be described in which two image reading apparatuses are used to explain the contents described in a document to a person at a remote place.
An electrical communication line is connected to each of the communication interfaces of the first and second image reading apparatuses placed at remote locations, and the document reading unit and the digital camera 12 are turned on by a button 10a on the operation panel of the first image reading apparatus. To. Further, a PC is connected to the external output terminal of the second image reading apparatus, and the digital camera 12 is turned on by the button 10a on the operation panel.
On the first image reading device side, an original is placed in parallel with the wall surface of the housing, and the read image signal is transmitted to the second image reading device through an electric communication line and displayed on the PC connected to the external output terminal. . On the other hand, the person image taken by the digital camera 12 of the second image reading device is displayed on the monitor on the image display unit of the first image reading device.
Therefore, the presenter on the first image reading apparatus side explains the material with the microphone while checking the state of the person receiving the explanation on the second image reading apparatus side, and the second image reading apparatus side displays it on the PC. You can listen to the explanations from the speakers while checking the recorded materials.

  Details of the imaging optical system of the document reading unit of this embodiment will be described below.

  FIG. 8 is an explanatory diagram of a mechanism in which the rotating mirror and the aspherical mirror perform a cooperative operation.

  As shown in FIG. 8, the rotary mirror 21 is pivotally supported by a rotary shaft 21a locked to both side surfaces 3 of the housing, and the rotation of the rotary shaft 21a allows the reading light incident from the window portion 6 to enter. The angle is adjusted, and the reflected reading light is directed to a certain height of the wall surface 2. Then, the aspherical mirror 22 is moved up and down in accordance with the reflection position of the reading light on the reading surface, and the position having a predetermined reflection characteristic on the aspherical mirror 22 is adjusted to the position of the certain height, thereby obtaining an image. Can correct the distortion.

  Protrusions 22a and 22b are provided at both ends of the aspherical mirror 22, and one projecting part 22a has a through hole with a thread groove. And the guide shaft 60 perpendicular | vertical to the reading surface in which the thread 60a was cut | engaged meshes with the through-hole. The other protrusion 22b has a relatively large through hole 22d that is not engraved with a screw groove. A guide shaft 61 that is not engraved with a thread and is perpendicular to the reading surface passes through the through hole 22d with play. As a result, the aspherical mirror 22 is pivotally supported by the two guide shafts 60 and 61 perpendicular to the reading surface. On the other hand, when the guide shaft 60 engraved with the thread 60a rotates, the aspherical mirror 22 moves in the direction of the arrow A accordingly. Moving.

  The guide shaft 60 meshes with a screw 62 having a spiral groove, and the screw 62 is rotationally driven by the motor 31 via a gear 63. Accordingly, the aspherical mirror 22 moves up and down in the direction of arrow A and in the opposite direction.

  Further, a tapered cam 64 is provided in the vertical direction at one end of the aspherical mirror 22. On the other hand, a first cam follower 65 (corresponding to the cam detection unit of the present invention) and a second cam follower 66 are pivotally attached to one end of the rotating shaft 21a of the rotating mirror 21, and the second cam follower 66 is The first cam follower 65 rotates integrally with the rotating shaft 21 a and is biased by a spring 67 in the direction opposite to the arrow B direction. The first cam follower 65 has an elliptical shape, and a rod-like portion 65a is attached to an oval portion. The rod-like portion 65a abuts on a tapered cam 64 provided at one end of the aspherical mirror 22, and when the aspherical mirror 22 moves in the direction of arrow A, the first cam follower 65 is rotated in the direction of arrow B. .

  Accordingly, the first cam follower 65 rotates in the direction of arrow B in accordance with the movement of the aspherical mirror 22 in the direction of arrow A, and the rotating shaft 21a of the rotating mirror 21 rotates in accordance with the movement, so the rotating mirror 21 also rotates. Since the angle of the reading light incident from the window changes, the reflected light of the rotating mirror 21 can be directed to the portion of the aspherical mirror 22 having a predetermined reflection characteristic.

  Here, the aspherical mirror 22 of the present embodiment is configured to rotate up and down by being driven by a motor 31, and the rotational axis 21 a of the rotating mirror 21 is rotated by the vertical movement of the aspherical mirror 22. The rotating shaft 20a of the reading light source 20 may be further rotated by the driving force of the motor 31.

  Next, the measurement principle for measuring the height of each position on the reading surface by the height measuring unit of the present embodiment will be described.

  FIG. 9 is an explanatory diagram of the principle of measuring the height of the reading surface when the book is opened upward and the image is read in the image reading apparatus of the present embodiment. FIG. FIG. 9B is an exploded view of the AF floodlight lamp, showing the relationship with the binding portion of the book.

  As shown in FIG. 9A, the image reading apparatus of the present embodiment reads by arranging the wall surface 2 of the housing 1 so as to be parallel to the binding portion 101 when the page of the book is opened. The surface 100 can be read. The narrow reading light is irradiated in parallel to the binding unit 101, and an image recorded on the reading surface 100 is read while being scanned line-sequentially in the scanning direction intersecting the binding unit 101 at the same height portion of the reading surface 100. It is done. Note that a book whose pages are opened can be read on both sides at once, or can be read page by page.

  With this configuration, one page is divided into small areas, the periphery of the small areas is overlapped and shot, and these are pasted together to create one copy image. Unnaturalness by combining can be solved.

  As shown in FIG. 9A, the height of each position on the reading surface by the height measuring unit is measured by obliquely crossing the reading surface 100 with the AF floodlight 39 from the window 7 provided in the upper right part of the wall surface 2. Thus, the slit-shaped measurement light 130 is irradiated between, for example, AB. When the reading surface is flat, the slit-shaped measurement light is a straight line, but in the case of a book with unevenness on the reading surface, it becomes a curve as shown in the figure.

  As shown in FIG. 9B, the AF floodlight is composed of a condenser lens 39a, a diaphragm 39b provided with a slit-like opening, a light emitting element 39c, and a reflector plate 39d. . For example, the light emitted from the light emitting element 39c made of LED is narrowed by the diaphragm 39b, becomes a slit shape, and can irradiate the reading surface with high brightness measurement light without being scattered by the action of the condenser lens 39a. .

  FIG. 10 is a diagram illustrating, as an example, each positional relationship when the original light is irradiated with measurement light from the AF floodlight.

  As shown in FIG. 10, the wall surface 2 of the housing 1 of the image reading apparatus according to the present embodiment is disposed at a predetermined interval on the side of the original reading surface ABCD 100, and the height H is located at the upper right portion of the wall surface 2. The slit 7 is irradiated between the reading surfaces BC with the slit-shaped measuring light 130 so as to cross the reading surface 100 obliquely from the window 7 provided in the AF.

  The distance between the wall surface 2 of the housing 1 and the reading surface 100 is y2, and the size of the reading surface 100 is x1 between AB and y1 between AC, and the distance from the window portion to one end of the reading surface is x2.

  11 is an orthographic view of the reading surface ABCD shown in FIG. 10, FIG. 11 (a) is a plan view seen from directly above, FIG. 11 (b) is a right side view seen from the x direction, FIG.11 (c) is the front view seen from the y direction.

  In the figure, BC represents slit-shaped measurement light, and EB and EC represent optical paths of measurement light emitted from the AF floodlight.

  Now, for convenience of explanation, let us consider a state where the reading surface ABCD is lifted by h. Then, the intersections B and C between the light beam emitted from the AF projection lamp and the reading surface are B ′, B ″, C ′, and C ″ in the right side view and the front view, and B in the plan view. ', C'.

  That is, when the reading surface is lifted by h, the line segment BC in the plan view is shifted to the line segment B'C ', which means that the shift is shifted to the right as h increases.

  Therefore, the position (x3, y3) on the line segment BC in the reading light l at a distance y3 from the front on the reading surface is K1, and the position (x4, y4) on the line segment B′C ′ is K2, h and , And the relationship with the distance between K1 and K2.

Now, if CD is the X coordinate and AC is the Y coordinate, the slit-shaped measurement light BC is
Y = (y1 / x1) * X.

The slit-shaped measuring light B′C ′ is
Y + (y2 * h / H) = (y1 / x1) * {X− (x2 * h / H)}
X = (x1 / y1) * {Y + (y2 * h / H)} + (x2 * h / H).

Therefore, if (x4-x3) is xm,
The relationship h = xm * H * {y1 / (y2 * x1 + x2 * y1)} is obtained.

  Therefore, if the reference position of the slit-shaped measurement light BC in a state where the reading surface is flat is stored and the difference from the actually measured position is obtained, the height (lift amount) at each position on the reading surface is obtained. be able to.

  FIG. 12 is an explanatory diagram of an AE light receiving element that measures the brightness of the reading surface.

  As shown in FIG. 12, an AE light receiving element 40 including a light receiving lens 40 a and a light receiving sensor 40 b is installed on the upper surface of the wall surface 2 of the housing 1. Since the reading surface 100 is normally illuminated by indoor illumination, the degree of brightness is measured, and the brightness of the reading light source is adjusted so that an appropriate amount of light can be obtained for reading.

  In this case, although the measurement accuracy is not so important, the light receiving lens 40a is configured to collect the reflected light from the entire reading surface 100 so that the average brightness of the reading surface 100 can be measured. Yes.

  FIG. 13 is an explanatory diagram of an image display unit having a monitor screen.

  As shown in FIG. 13, the image display unit 9 has a monitor screen composed of a liquid crystal panel, and the monitor screen is movably fixed to the side surface 3 of the housing 1 by a hinge 9 b. Therefore, when not in use, as shown in FIG. 13 (a), it is rotated in the direction of arrow C and pressed against the wall surface for storage, and when used, as shown in FIG. 13 (b), from wall surface 2 in the direction of arrow D. Thus, the image data stored in the memory can be displayed on the monitor screen.

  The image display unit 9 also has a display range designation button 9a for designating a range of an image to be displayed on the monitor. For example, the range selected on the entire monitor screen by selecting one page, two pages, or half page. The image read in can be displayed.

  FIG. 14 is a flowchart illustrating a procedure for reading a document by the document reading unit of the present embodiment.

  As shown in FIG. 14, the procedure for reading an image recorded from the upward reading surface of the document using the image reading apparatus of the present embodiment is set on the operation panel by the operator (S1) to (S4). Steps (S5) to (S9) when reading a flat document, and steps (S10) to (S16) when reading a document such as an uneven book. It is divided.

When an image recorded on an original is read by the image reading apparatus, it is necessary to turn on the power and perform scanning (scanning) with reading light (S1).
When the power is turned on, the reading light source is turned on, and the approximate brightness of the reading surface is measured by the AE light receiving element (photometry unit) (S2). Then, the scanning speed of the reading light is adjusted according to the measured brightness level, thereby adjusting the reading time of the reading surface (S3).
Here, the reading time of the reading surface may be set to three stages of “fast”, “normal”, and “slow” according to the measured exposure, or set to two stages of “normal” and “slow”. Alternatively, the adjustment of the reading time can be omitted by adjusting the brightness of the reading light source.

Although the manual setting is performed here, automatic setting may be performed.
Furthermore, instead of adjusting the scanning speed of the reading light based on the measurement result by the AE light receiving element, the intensity of the reading light may be adjusted and emitted.

  Next, the type of document to be read is set (S4).

  When the document is a sheet, reading is performed by automatically focusing the lens position in accordance with a program determined in advance according to the size of the document and the irradiation position of the reading light.

  First, the angle of the rotating mirror is adjusted so that the reading light reflected from the reading surface and incident from the window is incident at a predetermined incident angle, and the starting position of the rotating mirror is set (S5).

  Next, the mirror motor that moves the aspherical mirror up and down is driven to move the aspherical mirror and the rotating mirror to the reading start position where the reading light scans the reading surface (S6, S7).

When the aspherical mirror and the rotating mirror are set at the reading start position, the reading light source rotates, and the reading light scans the reading surface line-sequentially in the scanning direction. Then, the CPU controls the motor to move the aspherical mirror upward in accordance with the rotation of the reading light source, and to rotate the rotating mirror in conjunction with the movement. Thereby, the reading light reflected at each position on the reading surface and incident from the window portion is guided to a predetermined optical path. In addition, image distortion due to a difference in shooting distance in the scanning direction is corrected. Then, a light image is formed on the light receiving surface of the one-dimensional CCD by a lens that is pre-programmed and automatically focused, and an electric signal is acquired (S8).
Thereafter, this operation is continued to the reading end position (S9).

  On the other hand, when a book with an uneven surface is set as a document (S4), the height of the uneven surface from the reference surface must be measured to correct the lens position and the like. Therefore, the measurement light source is turned on, and the reading surface is irradiated with slit-shaped measurement light that obliquely crosses the reading surface. Then, the aspherical mirror and the rotating mirror are moved or rotated from the reading start position to the reading end position, and an electrical signal from each position on the reading surface is acquired by the one-dimensional CCD. As a result, a deviation amount between the position of the slit-shaped measurement light actually irradiated on the reading surface and the reference position irradiated with the measurement light when the reading surface is flat is obtained, and the uneven reading is performed from the deviation amount. An AF scan for obtaining the height of each position on the surface is performed (S10).

  Next, as in the case where the document is a sheet, the angle of the rotating mirror is adjusted so that the reading light reflected from the reading surface and incident from the window portion is incident at a predetermined incident angle. A starting position is set (S11). Then, the motor for moving the aspherical mirror up and down is driven to move the aspherical mirror and the rotating mirror to the reading start position where the reading light scans the reading surface (S12, S13).

  When the aspherical mirror and the rotating mirror are set at the reading start position, the reading light source rotates, and the reading light scans the reading surface line-sequentially in the scanning direction. Then, the motor moves the aspherical mirror upward in accordance with the rotation of the reading light source, and the rotating mirror rotates clockwise in conjunction with it, so that it reflects at each position on the reading surface and enters from the window. The reading light to be guided is guided to a predetermined optical path.

The focal position of the lens is corrected based on the previously measured height at each position on the reading surface, and is adjusted in focus by the zoom and AF motor drive circuit (S14). ).
Then, an electrical signal is obtained from a light image formed on the one-dimensional CCD element by the focused lens (S15).
Thereafter, this operation is continued to the reading end position (S16).
In this case, image distortion that cannot be corrected by the aspherical mirror is corrected by the image processing circuit on the electrical signal obtained by imaging with the one-dimensional CCD element based on the height measured by the AF scan. The

1 is a schematic external view showing an embodiment of an image reading apparatus of the present invention. It is the schematic which shows the digital camera of this embodiment. It is the schematic which shows the digital camera of this embodiment. FIG. 2 is a schematic diagram illustrating a document reading unit housed in a housing when the image reading apparatus of the present embodiment is viewed from the side. It is a schematic diagram which shows the relationship between the image caught by the one-dimensional image sensor with reading light, and a reading surface. It is a schematic functional block diagram in the image reading apparatus of this embodiment. It is a figure which shows the usage example of the image reading apparatus of this embodiment. It is explanatory drawing of the mechanism in which a rotation mirror and an aspherical mirror perform cooperation operation | movement. It is explanatory drawing of the principle which measures the height of the reading surface, when opening the page of a book and reading an image in the image reading apparatus of this embodiment. It is a figure which shows each positional relationship as an example when the measurement light by AF floodlight is irradiated to a document surface. It is a projection view of the reading surface ABCD. It is explanatory drawing of the AE light receiving element which measures the brightness of a reading surface. It is explanatory drawing of the display part which has a monitor screen. 6 is a flowchart illustrating a procedure for reading a document using the image reading apparatus according to the embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Case 2 Wall surface 3 Side surface 4 Upper surface 5 Bottom surface 6-8 Window part 9 Display part 9a Display range designation button 9b Hinge 10 Operation button 10a Original selection button 10b Specification button 10c Initial setting button 12 Digital camera 12a Support part 12b Shooting lens 12c Strobe 12d Arm 13 Speaker 14 Microphone 18 Original reading unit 20 Reading light source 20a, 21a Rotating shaft 21 Rotating mirror 22 Aspherical mirror 22a, 22b Protruding part 22d Through-hole 23 Reflecting mirror 24 Lens 25 One-dimensional solid-state image sensor (one-dimensional CCD element) ) 2D solid-state imaging device (2D CCD)
28 Sensor 30 Mirror drive mechanism 31 Scan motor 32 Scan motor drive circuit 33 Reading light source drive circuit 34 Lens mechanism 35 Zoom, AF motor drive circuit 36 CCD drive circuit 37, 37a, 37b Image processing circuit 38, 38a, 38b Memory 39 AF projection Ramp (height measurement part)
39a Condensing lens 39b Slit-shaped stop 39c Light emitting element 39d Reflector 40 AE light receiving element (photometric part)
40a Light receiving lens 40b Light receiving sensor 41 Operation panel 42a External output
42b External input 45 External monitor 50CPU
60, 61 Guide shaft 60a Thread 62 Screw 63 Gear 64 Cam 65 First cam follower 65a Rod-like portion 66 Second cam follower 67 Spring
100 PC
101 Binding Section 110 Reading Light 120 Reflected Reading Light 130 Measuring Light

Claims (20)

In an image reading apparatus that has an interface with the outside and obtains an image signal by capturing a light image representing a document or a subject with a solid-state image sensor,
A document reading unit that scans light irradiating the document and captures an image signal reflected by the document with a one-dimensional solid-state imaging device;
A subject imaging unit that captures a light image of a subject with a two-dimensional solid-state imaging device to obtain an image signal;
The document reading unit
A reading light source that emits light from above the original out of the normal projection range of the original and scans the reading light irradiated on both sides of the original in a scanning direction intersecting the reading light;
The reading light scanned on the original and reflected by the original is directed in a predetermined direction, and the lens position is automatically adjusted in accordance with the reflection position of the reading light on the original. An imaging optical system for focusing the optical image,
The imaging optical system is
A rotating mirror that is disposed adjacent to the reading light source and changes the incident angle of the reading light reflected at the reflection position by rotating in accordance with the scanning of the reading light;
An aspherical mirror that moves in accordance with the rotation of the rotating mirror and corrects distortion of the optical image caused by the difference in the reflection position of the reading light reflected by the rotating mirror;
A drive unit that rotates the rotating mirror and moves the aspherical mirror;
The document reading / reading unit measures the height of each position of the document scanned by the light in response to the non-planar being selected by an operator for selecting whether the document is planar or non-planar. An image reading apparatus characterized in that the optical image is focused on the basis of the height of each position of the original document and is picked up by the one-dimensional solid-state image sensor.   The image reading apparatus according to claim 1, wherein a movable memory for storing image signals obtained by the document reading unit and the subject imaging unit has a detachable interface. An audio input unit that converts audio into an electrical signal; and an audio unit that includes audio output means that converts an electrical signal into audio; and
An image display unit that receives an operation of a predetermined operator, performs image processing on any one of the image signals obtained by the document reading unit and the subject imaging unit, and displays the document or the monitor image of the subject on the screen The image reading apparatus according to claim 1, further comprising: An audio interface for outputting an audio electrical signal obtained by the audio input means to the outside, and inputting an audio electrical signal from the outside to the audio output means;
An image interface for outputting each image signal obtained by the document reading unit and the subject imaging unit to the outside, and inputting the image signal from the outside to the image display unit;
4. The image reading apparatus according to claim 3, further comprising a communication interface that transmits and receives the audio electrical signal and the image signal to and from a network. The document reading unit
In response to the selection that the document is non-planar, a height measuring unit that obtains the height from the reference surface of each of the reflection positions is provided.
The imaging optical system automatically adjusts the lens position set in advance according to each reflection position based on the height of each reflection position obtained by the height measuring unit. the image reading apparatus according to claim 1, wherein the focusing said light image. The document reading unit
A photometric unit for measuring the average brightness of the original;
The reading light source, an image reading apparatus according to claim 1, wherein the emitting light intensity is adjusted according to the measurement result by the light measuring unit. The imaging optical system includes a zoom lens having a variable focal length,
An image processing unit is provided that performs predetermined distortion correction on the image signal obtained by imaging with the one-dimensional solid-state imaging device when the focal length of the zoom lens is out of a predetermined range. The image reading apparatus according to claim 1 . In an image reading apparatus that has an interface with the outside and obtains an image signal by capturing a light image representing a document or a subject with a solid-state image sensor,
A vertical wall surface having a window at the top, and a housing having a side surface that intersects with the wall surface and has a width smaller than the height of the wall surface;
A subject imaging unit that is slidably supported in the housing and is movably supported, and obtains an image signal by capturing a light image of the subject with a two-dimensional solid-state imaging device;
A document reading unit that is housed in the housing and scans the light applied to the document and captures a light image reflected by the document with a one-dimensional solid-state imaging device to obtain an image signal;
An audio unit housed in the housing and having audio input means for converting sound into an electric signal; and audio output means for converting the electric signal into sound;
An image display that is slidably supported in the housing and is movably supported, performs image processing on any one of the image signals obtained by the document reading unit and the subject imaging unit, and displays the document or the subject on a monitor comprises a part, the,
The housing is arranged so that the wall surface is parallel to one side of the document,
The document reading unit
The shaft is pivotally supported on the upper side of the housing, emits light obliquely downward from the window, irradiates the original with reading light extending in the width direction of the housing wall, and scans in the scanning direction intersecting the wall. A reading light source,
A rotating mirror that is pivotally supported on the lower side of the side surface of the housing from the reading light source, and reflects the reading light incident on the window portion by being reflected by the document; and
The reading light directed downward by the rotating mirror is reflected at a predetermined position by being pivotally supported by the housing and moving in the vertical direction, and is caused by a difference in reflection position of the reading light on the document. An aspherical mirror that corrects the distortion of the optical image;
A lens that adjusts the amount of feeding and forms a focused optical image of the reading light reflected at the predetermined position of the aspherical mirror on the light receiving surface of the one-dimensional solid-state imaging device;
The rotating mirror is rotated in accordance with the scanning of the reading light by the reading light source so that the reading light directed downward by the rotating mirror is reflected at the predetermined position of the aspherical mirror, and A drive unit for moving the aspherical mirror;
A measurement light source that emits light obliquely downward from the window and irradiates the original with measurement light extending in the scanning direction;
An image reading apparatus comprising: a height measuring unit that obtains a height at each position in the scanning direction of measurement light emitted from the measurement light source . The housing has a plurality of openings,
A memory interface that is supported by any one of the plurality of openings and that is detachable from a movable memory that stores an image signal obtained by the document reading unit and the subject imaging unit;
An audio interface for outputting an audio electric signal obtained by the audio input means to the outside, and inputting an audio electric signal from the outside to the audio output means;
Each of the image signals obtained by the document reading unit and the subject imaging unit is output to the outside, the image interface for inputting the image signal from the outside to the image display unit, and the electrical signal of the audio between the network and the network 9. The image reading apparatus according to claim 8, further comprising a communication interface for transmitting and receiving the image signal. The subject imaging unit according to claim 8, characterized in that it comprises a support for supporting an illumination portion emitting flash rotatably when taking the subject by the photographing lens and the photographic lens for photographing said object The image reading apparatus described. The document reading unit
A photometric unit for measuring the average brightness of the original;
The image reading apparatus according to claim 8 , wherein the reading light source emits light whose intensity is adjusted in a diagonally downward direction from the window portion based on a measurement result by the photometry unit. The image reading apparatus according to claim 8 , wherein the image display unit includes an operator for designating a range of an image to be displayed on a monitor. An operator for selecting whether the document is flat or non-planar;
When a non-planar is selected by the operation element, the measurement light source is turned on and the height is obtained by the height measurement unit. After the height is obtained, the reading light source is turned on and the drive unit is turned on. 9. The image reading apparatus according to claim 8, further comprising a control unit for driving. An image processing unit that performs predetermined correction on the image signal obtained by imaging with the one-dimensional solid-state imaging device based on the height obtained by the height measuring unit. 9. The image reading apparatus according to 8 . The reading light source emits the reading light adjusted so that an average brightness at the time of imaging with the one-dimensional solid-state imaging device is uniform according to a position in the scanning direction on the reading surface. The image reading apparatus according to claim 8 . The aspherical mirror is pivotally supported by a guide shaft perpendicular to the reading surface provided along the side surface, and is disposed below the reflecting surface of the rotating mirror,
8. The drive unit, characterized in that for reflecting the reading light reflected by said rotary mirror aspherical mirror is vertically moved by rotating the guide shaft at the predetermined position of the non-spherical mirror The image reading apparatus described. The aspherical mirror has a cam that moves up and down in accordance with the vertical movement of the aspherical mirror,
The image reading apparatus according to claim 16 , wherein the rotating mirror is mounted with a rotating mechanism that detects a moving position of the cam and rotates a shaft of the rotating mirror. The measurement light source has a light emitting element, a slit-shaped aperture stop, a condenser lens, and irradiates slit-shaped measurement light that traverses the document in the scanning direction with the emitted measurement light,
The height measuring unit rotates the rotating mirror by the driving unit and moves the aspherical mirror, and the focused light image of the measurement light reflected at each position in the scanning direction of the original is the one-dimensional image. An image signal obtained by imaging with a solid-state imaging device and a reference image signal obtained by imaging a focused optical image of the measurement light reflected at each position in the scanning direction of the reference plane with the one-dimensional solid-state imaging device The image reading apparatus according to claim 8 , wherein the height from the reference surface of each position in the scanning direction is obtained based on a difference between the image reading position and the position in the scanning direction. The lens position is set in advance according to the reflection position of the reading light on the original, and the lens position is adjusted in accordance with the scanning of the reading light to reflect the lens at a predetermined position of the aspherical mirror. When the height of each position in the scanning direction is determined by the height measuring unit, the focused light image by the reading light is formed, based on the determined height, The image reading apparatus according to claim 18 , wherein the lens position is corrected and focusing is performed at the corrected lens position. The reading light source, the Hakataka unit based on the image signal obtained by the scanning direction each position of the original by, according to claim 18, wherein the freely adjusted the intensity of the light emitted Image reading device.

Images