JPH06225082A - Solid object picture reader - Google Patents

Abstract

PURPOSE:To provide the solid object picture reader which vividly reads even the picture of a solid object having ruggedness. CONSTITUTION:In the solid object picture reader provided with illuminating systems 5a and 5b illuminating a document and an optical system which forms the image of reflected light from the document on a CCD image sensor 12, a stop is provided in the optical path to the CCD image sensor 12, and the diameter of the stop and angles of reflectors of illuminating systems 5a and 5b are changed in accordance with selection of the normal document read mode or the solid document read mode to increase the focal depth, and the quantity of light of illuminating systems 5a and 5b, the scanning speed of a scanner, the shift gate gap to the CCD image sensor 12, the clock period, etc., are changed by a varying means 26.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a three-dimensional object image reading apparatus capable of reading an image of a three-dimensional object having irregularities.

[0002]

2. Description of the Related Art Up to now, in order to increase the depth of focus when copying a three-dimensional object, as described in Japanese Utility Model Laid-Open No. 2-116169, the contact glass is moved in a direction perpendicular to the front and back surfaces to obtain a high resolution. There is one in which the center position is located above the contact glass surface.
In addition, JP-A-59-214842 and JP-A-56
As described in Japanese Patent Laid-Open No. -74276, there is one in which a diaphragm is operated to correct the light amount at the time of zooming and the angle of a reflector of an illumination system is changed.

[0003]

In the current copying machine, since a flat object that is in close contact with the contact glass is the object of copying, when the image of an uneven object is read, the read image is blurred or the read image is lost. When the image is copied, the image becomes dark or has a shadow, and the desired copy cannot be obtained.

An object of the present invention is to provide an apparatus for clearly copying a three-dimensional object having irregularities. Furthermore, the user can select the amount of depth of focus according to the unevenness of the document to clearly copy a three-dimensional object having unevenness, and even when the three-dimensional document reading mode is selected, it is possible to prevent the copy speed from decreasing. An object image reading apparatus is provided.

[0005]

The invention according to claim 1 is
An illumination system for illuminating an original and a CCD for reflecting light from the original
In a three-dimensional object image reading apparatus including an optical system for forming an image on an image sensor, a diaphragm is provided in an optical path between the original and the CCD image sensor to select a normal original reading mode and a three-dimensional original reading mode. According to the above, variable means for changing the diaphragm diameter of the diaphragm, the angle of the reflector of the illumination system and the light amount of the illumination system are provided.

According to a second aspect of the present invention, in the three-dimensional object image reading apparatus including an illumination system for illuminating a document and an optical system for forming reflected light from the document on a CCD image sensor, the document and the document are read. An aperture is provided in the optical path between the CCD image sensor and the CCD, and the aperture diameter of the aperture, the angle of the reflector of the illumination system, the scanning speed of the scanner, and the CCD are selected according to the selection between the normal document reading mode and the three-dimensional document reading mode. The variable means for changing the shift gate interval and the clock period for the image sensor is provided.

According to a third aspect of the invention, there is provided a three-dimensional object image reading apparatus including an illumination system for illuminating a document and an optical system for forming reflected light from the document on a CCD image sensor. A diaphragm is provided in the optical path between the CCD image sensor and the aperture diameter of the diaphragm, the angle of the reflector of the illumination system, the light amount of the illumination system, and the scanner according to the selection between the normal document reading mode and the three-dimensional document reading mode. Variable means for changing the scanning speed, the shift gate interval for the CCD image sensor, and the clock cycle.

According to the invention described in claim 4, the diaphragm diameter of the diaphragm and the angle of the reflector of the illumination system can be arbitrarily changed.

According to a fifth aspect of the invention, a frame memory for storing the image data read by the CCD image sensor is provided.

According to a sixth aspect of the present invention, a frame memory is provided in which the diaphragm diameter of the diaphragm and the angle of the illumination system are changed each time and the image data read by the CCD image sensor is added and stored.

[0011]

According to the first aspect of the present invention, the aperture diameter of the aperture is adjusted to maintain the in-focus state even at a position away from the contact glass, and the accuracy of the reflector is changed to maximize the area above the contact glass surface. By setting the illuminance distribution so that the light amount of the illumination system is increased to compensate for the decrease in the light amount to the CCD image sensor, it is possible to clearly read an image of a three-dimensional object having irregularities.

According to a second aspect of the present invention, the aperture diameter of the aperture is adjusted to maintain the in-focus state even at a position away from the contact glass, and the accuracy of the reflector is changed to maximize the area above the contact glass surface. The illuminance distribution should be set, and at that time, the scanning speed of the scanner should be reduced to CC.
By compensating for the decrease in the amount of light to the CCD image sensor by lengthening the accumulation time of the D image sensor, it is possible to clearly read even a three-dimensional object having irregularities.

According to the third aspect of the present invention, the aperture amount is increased to maintain the in-focus state even at a position where the distance from the contact glass is large, and the accuracy of the reflector is changed to change the accuracy from the contact glass surface. The maximum illuminance distribution is located at a considerable distance above, at which time the light amount of the illumination system is increased and the scanning speed of the scanner is slowed to increase the accumulation time of the CCD image sensor.
By compensating for the decrease in the amount of light to the CD image sensor,
Even a three-dimensional object with irregularities can be clearly copied.

According to the fourth aspect of the invention, the user can select the amount of depth of focus by arbitrarily changing the aperture diameter of the diaphragm and the angle of the reflector of the illumination system, so that a natural shadow matching the unevenness of the copy is produced. You can get a copy.

According to the fifth aspect of the present invention, even when the scanning speed of the scanner is slowed down by narrowing down the diaphragm, the data once stored in the frame memory can be output from the printer. At the speed of
It is possible to make a clear copy of a three-dimensional object having irregularities.

According to the sixth aspect of the present invention, by changing the accuracy of the reflector and repeating the scanning a plurality of times, even when the aperture is narrowed down to a very small size, it is possible to read with a uniform brightness from a portion close to the contact glass to a portion far from the contact glass. It can be carried out. In addition, since the data once stored in the frame memory can be output from the printer, it is possible to make a clear copy of a three-dimensional object having irregularities at the same speed of the printer as during normal copying.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 3 is a front view showing a schematic configuration of a three-dimensional object image reading apparatus used in a digital copying machine according to the present invention, and FIG. 4 is a configuration diagram showing a configuration of a printer section using a laser.

First, the three-dimensional object image reading apparatus shown in FIG. 3 will be described. A contact glass 2 on which an original is placed is provided on the upper surface of the scanner body 1. Below the contact glass 2, a first scanner 3 and a second scanner 4 as scanners are provided so as to be horizontally movable (movable in the sub-scanning direction). The first scanner 3 has a pair of light sources (halogen lamps) 5a and 5b as an illumination system, and a mirror 6 located below the light sources 5a and 5b. The second scanner 4 sequentially scans the light from the mirror 6 by 90
It has mirrors 7 and 8 for reflecting each time. Further, below the movement path of the second scanner 4, a mirror 9 for reflecting the light from the mirror 8 downward and a mirror 10 for reflecting the light from the mirror 9 are provided. Mirror 10
A lens 11 as an optical system for image formation is arranged in the outgoing optical path of the line, and a line type CCD image sensor 12 is arranged at the focus position thereof.

As shown in FIG. 5, the lens 11 has a built-in diaphragm 13 for changing the diaphragm diameter. A gear 16 driven by a diaphragm driving stepping motor 15 is meshed with a gear 14 formed on the outer periphery of the diaphragm 13. Normally, the diaphragm 13 is opened to the maximum so as to satisfy the characteristics of the lens 11.

As shown in FIG. 6, the angles of the reflectors 17a and 17b of the light sources 5a and 5b can be changed so that the maximum light amount portion can be brought on the document surface, or the maximum light amount portion can be provided at a portion distant from the document surface. You can also bring That is,
The reflectors 17a and 17b are link mechanisms 18a and 18b.
It is connected to the plungers 20a and 20b of the reflector driving solenoid 19 via. Usually reflector 1
The angles 7a and 17b are set so that the maximum light amount portion is on the document surface.

Next, the circuit configuration of the electric system will be described with reference to FIG. The image signal read by the CCD image sensor 12 is a VPU (video processing unit) 21.
Is given an appropriate gain, A / D converted, and output as 8-bit digital data DATA0 to DATA7 synchronized with ck1. As shown in FIG. 2, for the VPU 21, CCDSTN that determines the read timing of the CCD image sensor 12 and ck1 that is a clock of 10 MHz.
Is sent from an IPU (image processing unit) 22.

The IPU 22 performs black offset correction, shading correction, MTF correction, electrical scaling in the main scanning direction, and then performs γ correction and image quality processing such as dithering and error diffusion. The black offset correction is a correction for subtracting the black level of the dark current of the CCD image sensor 12 from the image data. The shading correction is performed by the light source 5 in the main scanning direction.
In order to eliminate the unevenness of the light amount of a and 5b and the unevenness due to the difference in sensitivity between the pixels of the CCD image sensor 12, a white plate (not shown) having a uniform density is read before the scanning of the original, and the data is stored for each pixel. Then, the correction is performed by dividing the image data during the reading of the document by the read data of the stored white plate for each pixel. The MTF correction is to correct optical frequency characteristic deterioration and the like with a two-dimensional spatial filter (not shown). Various corrected data SDT0
7 is sent to the GAVD (gate array video circuit) 23. The GAVD 23 performs speed conversion of this image data to 8.7 MHz in order to convert to the writing speed of the printer. LD (laser diode) modulator 24
Then, the pulse width and the amount of current supplied to the semiconductor laser 25 are controlled according to the 8-bit 256-tone image data.

The main control board 26 has a CPU 27
And fixed data such as program data is written in R
An OM 28 and a RAM 29 to which variable data is written are provided, and these and the IPU 22 share an address bus and a data bus, and communication is performed via this.
The main control plate 26 includes the aperture driving stepping motor 15, the reflector driving solenoid 19, the scanner driving motor 30 for driving the first and second scanners 3 and 4, the light sources 5a and 5b, and the printer. A drive motor 31, a polygon drive motor 32, other actuators and various clutches (not shown) are connected. The printer driving motor 31, the polygon driving motor 32, etc. are used for the operation of the printer unit shown in FIG.

As shown in FIG. 5, the printer unit includes a laser generator 33, an optical system 34 for focusing the laser light from the laser generator 33 at a predetermined position, and a reflection for reflecting the output light of the optical system 34. A mirror 35, a photosensitive drum 36 irradiated with a beam from the reflecting mirror 35, a charger 37 for uniformly charging the photosensitive drum 36 before exposure, and a developing device for developing an electrostatic latent image by exposure with toner. 38, a registration roller 39 that feeds the transfer sheet to the transfer position at a timing, a plurality of sheet feed cassettes 40 and 41 in which transfer sheets of different sizes are set, and one sheet is transferred from these sheet feed cassettes 40 and 41 A transfer charger that transfers the toner image on the photosensitive drum 36 to the transfer paper that is sent from the paper feed rollers 42 and 43 that sends out the paper and the registration roller 39. 4, a separation charger 45 for separating the transfer end portion of the transfer paper from the photosensitive drum 36, a conveyor belt 46 for conveying the separated transfer paper, and a toner image attached to the transfer paper conveyed by the conveyor belt 46. The fixing device 47 for fixing and the cleaning device 4 for removing the residual toner adhering to the surface of the photosensitive drum 36.
8 and a discharge tray 49 for accommodating the transfer paper from the fixing device 47. The laser generator 33
Is for deflecting laser light emitted from the semiconductor laser 25 by a polygon mirror (not shown), and this polygon mirror is driven by the polygon driving motor 32.

In FIG. 5, the photosensitive drum 36 is charged in advance by the charging charger 37. Then, the laser generator 33 is modulated and driven according to the read image information, and the beam output from the laser generator 33 is transmitted to the optical system 3.
4. A latent image is formed by irradiating the photosensitive drum 36 through the reflecting mirror 35. This latent image is on the photosensitive drum 3.
The image is developed by the developing device 38 according to the rotation of 6. The transfer paper sent from the paper feed cassette 40 or 41 is fed by the registration roller 39 at the timing when the visible image by toner development reaches the transfer position, and is transferred by the transfer roller 44 at the transfer position by the photosensitive drum. The toner image on 36 is attracted to the transfer paper. The transfer paper that has been transferred is separated from the leading edge of the transfer charger 4 by
It is peeled off by 5 and sent out onto the conveyor belt 46. The transfer sheet on the conveyor belt 46 is carried into the fixing device 47, where heat and pressure are applied to fix the toner image on the transfer sheet. The transfer sheet on which the fixing is completed is sent to the discharge tray 49.

With such a structure, when an image is read in the normal original reading mode, the original is set on the contact glass 2 with the image side down and the start button is pressed. As a result, the CPU 27 issues an SSCAN to the IPU 22, and FGATEN indicating the effective image range in the sub-scanning direction becomes ACTIVE. The first scanner 3 and the second scanner 4 start moving to the left in the figure, and the sub-scanning of the document is performed. At this time, the second scanner 4
Moves at half the speed of the first scanner 3. Light source 5
Reflected light from the document illuminated by a and b (reading light)
Reaches the CCD image sensor 12 through the mirror 6, the mirror 7, the mirror 8, the mirror 9, the mirror 10, and the lens 11 in this order. The CCD image sensor 12 converts the incident light into an electric signal and sends it to the processing circuit. In normal copying, DSCAN is used by CPU2 at the same time as SSCAN.
DGAT of the operation start signal of the printer section issued from 7
EN becomes ACTIVE, and writing is performed by the printer unit in FIG.

The above is the copy operation in the normal mode.
Next, the operation of the three-dimensional object document reading mode in the embodiment corresponding to each claim will be described.

An embodiment of the invention described in claim 1 will be described. When the three-dimensional document reading mode is designated from the operation unit (not shown), the aperture 1 attached to the lens 11
Reference numeral 3 denotes an aperture driving stepping motor 15 controlled by the main control plate 26 so as to reduce the aperture to a predetermined aperture diameter (see FIG. 3), and reflectors 17a and 17b are controlled by the reflector driving solenoid 19 controlled by the main control plate 26. 10m from 2 sides of contact glass
The angle can be changed so that the maximum illuminance distribution is above m.
Along with this, in order to compensate for the decrease in the amount of light on the CCD image sensor 12, the amount of current flowing through the light sources 5a and 5b is increased. By narrowing down the diaphragm 13, the depth of focus of the lens 11 is deepened, and the contact glasses 2 to 1
The in-focus state is maintained even at a position about 0 mm away. At this time, the angles of the reflectors 17a and 17b are changed so that the maximum illuminance distribution is 10 mm above the contact glass 2 surface, so that even at a position distant from the contact glass 2 surface, the same illuminance on the contact glass 2 surface can be obtained. can get. In this way, since the light amount equivalent to that in normal copying is controlled by the main control plate 26 and reading is performed with the diaphragm diameter of the diaphragm 13 reduced, it is possible to read clearly even a three-dimensional object having irregularities.

Next, an embodiment of the invention described in claim 2 will be described. The diaphragm operation of the diaphragm 13 and the angle change of the reflectors 17a and 17b by the main control plate 26 are the same as those of the embodiment of the invention described in claim 1, and the description thereof is omitted (the same applies hereinafter). When the 3D original reading mode is specified, the diaphragm 13 is narrowed down to 10 mm from the contact glass surface.
Reflector 17 so that the maximum illuminance distribution is above mm
The angles of a and 17b can be changed. Along with this, in order to compensate for the decrease in the amount of light on the CCD image sensor 12, the scanner drive motor 30 is controlled by the main control plate 26 so that the scanning speed of the scanners 3 and 4 becomes 1/4 of the normal speed. The clock generation circuit in the IPU 22 is switched by a command from the main control board 26 so that the shift gate interval for the CCD image sensor 12 and the clock cycle are four times as long as usual.

In this three-dimensional object reading mode, I
Not only the data inside the PU 22 but also the polygon driving motor 32 and the printer driving motor 31 are operated at a speed of 1/4 so that the magnification in the sub-scanning direction does not change. Even when the diaphragm 13 is thus narrowed, the scanning speeds of the scanners 3 and 4 are changed so that the same amount of light as in normal copying can be obtained, so that clear reading can be performed even on a three-dimensional object having irregularities. it can.

Further, an embodiment of the invention described in claim 3 will be described. The control of the scanning speed of the scanners 3 and 4, the shift gate interval for the CCD image sensor 12, and the control of the clock cycle are the same as those in the embodiment of the invention described in claim 2, and the description thereof will be omitted. When the three-dimensional document reading mode is designated, the diaphragm 13 is narrowed down to a predetermined diaphragm diameter, and the angles of the reflectors 17a and 17b can be changed so that the maximum illuminance distribution is 20 mm above the contact glass surface. Along with this, in order to compensate for the decrease in the amount of light on the CCD image sensor 12, the amount of current flowing through the light sources 5a and 5b is increased, and the scanning speed of the scanners 3 and 4 is 1/4 of the normal speed.
The clock generation circuit in the IPU 22 is switched by a command from the main control board 26 so that the shift gate interval and the clock period for the CCD image sensor 12 become four times as long as usual. It is composed.

In this three-dimensional object original reading mode, I
Not only the data inside the PU 22 but also the polygon driving motor 32 and the printer driving motor 31 are operated at a speed of 1/4 so that the magnification in the sub-scanning direction does not change. In this way, even when the diaphragm 13 is further narrowed down, the light amounts of the light sources 5a and 5b are increased and the scanning speeds of the scanners 3 and 4 are changed so that the light amount equivalent to that at the time of normal copying is obtained. It is possible to read clearly even with a three-dimensional object.

Further, an embodiment of the invention described in claim 4 will be described. Specify the 3D original scanning mode. Then, the user determines the depth of the unevenness of the three-dimensional object and sets the depth of focus from the operation unit. The diaphragm 13 is narrowed down to a predetermined diaphragm diameter as described above, and the angles of the reflectors 17a and 17b are changed so that the reflectors 17a and 17b can be illuminated uniformly upward by an amount corresponding to the extension of the depth of focus. Along with this, in order to compensate for the decrease in the amount of light on the CCD image sensor 12, the amount of current flowing through the light sources 5a and 5b is increased, and the scanning speed of the scanners 3 and 4 is controlled to be 1/4 of the normal speed. The clock generation circuit in the IPU 22 is switched by a command from the main control board 26 so that the shift gate interval and the clock period for the CCD image sensor 12 become four times the normal one.

In this three-dimensional object original reading mode, I
Not only the data inside the PU 22 but also the polygon driving motor 32 and the printer driving motor 31 are operated at a speed of 1/4 so that the magnification in the sub-scanning direction does not change. Since the user can select the amount of depth of focus in this manner, it is possible to obtain a copy with natural shading that matches the unevenness of the original surface of the three-dimensional object.

Further, an embodiment of the invention described in claim 5 will be described. When the three-dimensional document reading mode is designated, the diaphragm 13 is narrowed down to a predetermined diaphragm diameter, and the reflector 17
The angles of a and 17b can be changed so that the maximum illuminance distribution is 10 mm above the contact glass surface. Along with this, in order to compensate for the decrease in the amount of light on the CCD image sensor 12, the scanner drive motor 30 is controlled so that the scanning speed of the scanners 3 and 4 becomes 1/4 of the normal speed, and the CCD image sensor 12 is accordingly driven. The clock generation circuit in the IPU 22 is switched by a command from the main control board 26 so that the shift gate interval and the clock cycle are four times as long as usual.
However, when the speed of the printer unit is not changed, the read data is temporarily stored in the frame memory 50 (see FIG. 7) in this embodiment in order to prevent the change of the magnification due to the operation speed in the sub-scanning direction becoming ¼. It is configured to do. In this embodiment, the reduction of the light amount is compensated only by slowing the scanning speed of the scanners 3 and 4.
As shown in the embodiment of the invention described in claim 3, the light source 5
You may combine the structure which increases the light quantity of a and 5b.

FIG. 6 shows the structure of the frame memory 50.
The data after shading in the IPU 22 is input to M_IN0 to 7 of the frame memory 50. As shown in the time chart of FIG. 8, the CPU 27 of the main control board 26
As a result, R / W = L and EN = L (active) are output prior to scanning. After that, following the scan, FGA
TEN and LGATEN are output, and the data MEM_IN0 to 7 are written in the frame memory 50. The clock ck1 at this time is 2.5 MHz, which is four times as long as the normal cycle.
z clock. When the scanning ends, EN = H is set and the writing ends.

At the time of printout, as shown in the time chart of FIG. 9, R / W = H is set before DFGATEN, then EN = L, and it is normally set by DFGATEN and LGATEN which are sub-scanning effective signals for the printer. The reading is performed in synchronization with the 10-MHz clock ck1 of the cycle. The read data M_OUT0 to M_OUT0 to 7 are returned to the IPU 22 again, subjected to predetermined processing, and output to the printer unit.

In this way, the diaphragm 13 is narrowed down and the scanner 3,
Since the data is temporarily stored in the frame memory 50 even when the scanning speed of 4 is slowed down, it is possible to make a clear copy of a three-dimensional object having irregularities at the same speed as the printer unit during normal copying. it can.

Further, an embodiment of the invention described in claim 6 will be described. If you specify the 3D original scanning mode,
During the first scanning of the original, the diaphragm 13 is narrowed down to a predetermined diaphragm diameter, and the reflectors 17a and 17b can be changed in angle so that the reflectors 17a and 17b can be illuminated uniformly upward by an amount corresponding to an increase in the depth of focus. Along with this, in order to compensate for the decrease in the amount of light on the CCD image sensor 12, the scanner drive motor 30 is controlled so that the scanning speed of the scanners 3 and 4 becomes 1/4 of the normal speed, and the CCD image sensor 12 is accordingly driven. The clock generation circuit in the IPU 22 is switched by a command from the main control board 26 so that the shift gate interval and the clock cycle are four times as long as usual. However, when the speed of the printer unit is not changed, the read data is temporarily stored in the frame memory 51 (see FIG. 10) in this embodiment in order to prevent a change in the magnification due to the operation speed in the sub-scanning direction becoming ¼. It is configured to do. In this embodiment, the scanners 3, 4
The configuration is such that the decrease in the light amount is compensated only by slowing the scanning speed of 1. However, as shown in the embodiment of the invention described in claim 3, a configuration in which the light amounts of the light sources 5a and 5b are increased may be combined. .

FIG. 10 shows the structure of the frame memory 51. The data after shading in the IPU 22 is input to M_IN0 to 7 of the frame memory. The input data is always added to the read data of the same address and taken into the frame memory 51. As shown in the time chart of FIG. 8, R / W = L and EN = L (active) are output from the CPU 27 of the main control board 26 prior to scanning. After that, along with the scan, FGATE
N and LGATEN are output and the data M_IN0 to 7 + M_OUT0 to 7 are written in the frame memory 51. The clock ck1 at this time is a 2.5 MHz clock having a cycle four times that of the normal clock. When the scan ends, EN = H, and the writing ends.

When RES is set to L while EN = H, all bits can be cleared to 0 by hardware, so that the frame memory 51 is reset before the first reading.

During the second scanning of the original, scanning is performed in the same manner as during the first scanning, but the reflectors 17a and 17b are used.
The angle can be changed by the reflector driving solenoid 19 so that the maximum illuminance distribution is above the first scanning. The read data is added to the first scan data and stored in the frame memory 51. By repeating such scanning a plurality of times, even when the diaphragm 13 is narrowed down to an extremely small size, it is possible to read with a uniform brightness from a portion near the contact glass 2 to a portion far from the contact glass 2. Further, since the data is temporarily stored in the frame memory 51, it is possible to make a clear copy of a three-dimensional object having irregularities at the same speed as the printer unit during normal copying.

As can be understood from the above embodiments, the main control plate 26 has the aperture diameter of the diaphragm 13 and the reflectors 17a of the illumination system depending on the selection between the normal document reading mode and the three-dimensional document reading mode. 17b angle,
Light intensity of illumination system, scanning speed of scanners 3 and 4, CCD
It functions as a variable unit that changes the shift gate interval for the image sensor 12 and the clock cycle.

The aperture driving stepping motor 15
Instead of the above, as shown in FIG.
The aperture diameter of the aperture 13 may be reduced by 2. In this case, the plunger 5 of the diaphragm driving solenoid 52
3 and the diaphragm 13 may be connected by a rod 54. Also,
Instead of the solenoid 19 for driving the reflector, a motor for driving the reflector may change the angles of the reflectors 17a and 17b.

[0045]

According to the first aspect of the invention, a diaphragm is provided in the optical path between the document and the CCD image sensor, and the diaphragm diameter of the diaphragm and the illumination are selected according to the selection between the normal document reading mode and the three-dimensional document reading mode. Since the variable means for changing the angle of the reflector of the system and the light amount of the illumination system is provided, the diaphragm diameter of the diaphragm is adjusted to maintain the in-focus state even at a position away from the contact glass, By changing the accuracy so that the maximum illuminance distribution is above the contact glass surface, and at that time, increasing the light quantity of the illumination system to compensate for the decrease in the light quantity to the CCD image sensor, the three-dimensional object Even images can be read clearly.

According to a second aspect of the present invention, a diaphragm is provided in the optical path between the document and the CCD image sensor, and the diaphragm diameter of the diaphragm and the illumination system are changed according to the selection between the normal document reading mode and the three-dimensional document reading mode. Since the variable means for changing the angle of the reflector, the scanning speed of the scanner, the shift gate interval with respect to the CCD image sensor, and the clock cycle was provided, the aperture diameter of the aperture was adjusted to bring the focus into focus even at a position away from the contact glass. The maximum illuminance distribution is maintained above the contact glass surface by maintaining the above-mentioned state and changing the accuracy of the reflector. At that time, the scanning speed of the scanner is slowed to increase the accumulation time of the CCD image sensor. By compensating for the decrease in the amount of light to the image sensor, it is possible to read clearly even a three-dimensional object having irregularities.

According to the third aspect of the present invention, a diaphragm is provided in the optical path between the original and the CCD image sensor, and the diaphragm diameter of the diaphragm and the illumination system are adjusted according to the selection between the normal original reading mode and the three-dimensional original reading mode. Since the variable means for changing the angle of the reflector, the light amount of the illumination system, the scanning speed of the scanner, the shift gate interval for the CCD image sensor, and the clock cycle is provided, the diaphragm amount of the diaphragm is increased and the separation distance from the contact glass is increased. Keeps in focus even at a large position, and changes the accuracy of the reflector so that the maximum illuminance distribution is above the contact glass surface, and at that time, increases the light intensity of the illumination system. Along with this, the scanning speed of the scanner is slowed down and the accumulation time of the CCD image sensor is lengthened to reduce the amount of light on the CCD image sensor. By supplementing the bottom, it is possible to perform clear copy even three-dimensional object having irregularities.

According to the fourth aspect of the invention, since the aperture diameter of the diaphragm and the angle of the reflector of the illumination system can be arbitrarily changed, the user can select the amount of depth of focus. It is possible to obtain a copy with a natural shading that matches the.

According to the fifth aspect of the present invention, since the CCD image sensor is provided with the frame memory for storing the read image data, even if the scanning speed of the scanner is slowed down by narrowing the diaphragm, the data once stored in the frame memory. Is output from the printer, it is possible to make a clear copy of a three-dimensional object having irregularities at the same speed as the printer during normal copying.

According to the sixth aspect of the present invention, since the frame memory for accumulating the image data read by the CCD image sensor while adding the image data for each time by changing the aperture diameter of the diaphragm and the angle of the illumination system is added, the accuracy of the reflector is improved. By repeating the scanning several times with different apertures, it is possible to read with uniform brightness from the part near the contact glass to the part far from the contact glass even when the aperture is narrowed down to a very small value. Is output from the printer, it is possible to make a clear copy of a three-dimensional object having irregularities at the same speed as the printer during normal copying.

[Brief description of drawings]

FIG. 1 is a block diagram of an electric system according to an embodiment of the present invention.

FIG. 2 is a timing chart showing an output of a signal for determining reading of the CCD image sensor.

FIG. 3 is a front view showing a schematic configuration of a stereoscopic image reading apparatus of a digital copying machine.

FIG. 4 is a front view showing a schematic configuration of a printer unit of a digital copying machine.

FIG. 5 is a perspective view showing a driving structure of a diaphragm.

FIG. 6 is a perspective view showing a driving structure of a reflector.

FIG. 7 is a schematic diagram showing a frame memory according to an embodiment of the present invention.

FIG. 8 is a timing chart for a frame memory.

FIG. 9 is a timing chart for a frame memory.

FIG. 10 is a schematic diagram showing a frame memory according to an embodiment of the invention as set forth in claim 6;

FIG. 11 is a perspective view showing another example of the driving structure of the diaphragm.

[Explanation of symbols]

 3, 4 Scanner 5a, 5b Illumination system 11 Optical system 12 CCD image sensor 13 Aperture 17a, 17b Reflector 26 Variable means 51, 52 Frame memory

Claims (6)

[Claims] 1. A three-dimensional object image reading device comprising an illumination system for illuminating a document and an optical system for forming reflected light from the document on a CCD image sensor, wherein the document image is read between the document and the CCD image sensor. And a variable means for changing the aperture diameter of the diaphragm, the angle of the reflector of the illumination system, and the amount of light of the illumination system according to the selection between the normal document reading mode and the three-dimensional document reading mode. A three-dimensional object image reading device characterized in that 2. A three-dimensional object image reading device comprising an illumination system for illuminating a document and an optical system for forming reflected light from the document on a CCD image sensor, wherein the document image is read between the document and the CCD image sensor. A diaphragm is provided in the optical path of the scanner, and the diaphragm diameter of the diaphragm, the angle of the reflector of the illumination system, the scanning speed of the scanner, and the shift gate interval with respect to the CCD image sensor according to the selection between the normal document reading mode and the three-dimensional document reading mode. And a three-dimensional object image reading device, which is provided with variable means for changing the clock period. 3. A three-dimensional object image reading apparatus comprising an illumination system for illuminating a document and an optical system for forming reflected light from the document on a CCD image sensor, wherein the document is between the document and the CCD image sensor. An aperture is provided in the optical path of the aperture, and the aperture diameter of the aperture, the angle of the reflector of the illumination system, the light amount of the illumination system, the scanning speed of the scanner, and the CCD according to the selection between the normal document reading mode and the three-dimensional document reading mode. A three-dimensional object image reading apparatus comprising variable means for changing a shift gate interval and a clock cycle for an image sensor. 4. The three-dimensional object image reading apparatus according to claim 1, wherein the diaphragm diameter of the diaphragm and the angle of the reflector of the illumination system can be arbitrarily changed. 5. The three-dimensional object image reading device according to claim 1, wherein the CCD image sensor is provided with a frame memory for storing the read image data. 6. A frame memory for accumulating while accumulating the image data read by the CCD image sensor by changing the diaphragm diameter of the diaphragm and the angle of the illumination system each time, and storing the frame memory. The three-dimensional object image reading device according to 3 or 4.