JPH0537736A - Picture reader - Google Patents

Abstract

PURPOSE:To realize the picture reader of a small size in which a picture of all sizes is read by providing a transparent original scanning mode means and a back light mode means to the reader. CONSTITUTION:A film 21 of 35mm size is lighted via a slit of a slit plate 28 with an optical system 25 in the film scan mode in a projection section to project a transmission original and an optical image is projected to a projection plate 31 on the original platen 11 by a reflecting mirror 30. Furthermore, in the back light mode, the reflecting mirror 30 and the slit plate 28 are set to the back light mode and a picture of a film whose size is 35mm or over is read. Thus, the transmission original scanning mode or the back light mode is selected depending on the size of the transmission original to read the picture of the transmission original and the small sized picture reader is realized, in which the picture of a film of all sizes is read with high accuracy.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an original reading device capable of reading an image of a transparent original.

[0002]

2. Description of the Related Art Conventionally, as an original reading apparatus capable of reading an image of a transparent original, the placement of the film is changed depending on the size of the transparent original (hereinafter referred to as film), that is, for a 35 mm negative film or positive film. The image is projected to a certain size on the platen and other 4'x5 'film is placed on the platen, the film is illuminated from the back, and the image is scanned by moving the carriage. There is a method of reading.

Further, in JP-A-2-170765 and JP-A-2-174462, the film is illuminated from the back by a back light device and the image thereof is projected through a slit onto a document table to sub-film the film. A method is described in which the projected light image is read while the carriage is fixed while scanning in the scanning direction.

[0004]

In the above-mentioned image reading apparatus, a 35 mm film projects its image on the original table to a certain size, and other 4'x5 'films are projected on the original table. The device (optical system) becomes large because it is placed and the film is illuminated from behind and the image is scanned and read. In addition, the focus adjustment is difficult (the focus adjustment cannot be performed well even with the automatic focusing device), and the unevenness of the light amount is large especially in the film of 35 mm, and the image on the film cannot be read accurately.

Further, in the above-mentioned image reading apparatus, the film is illuminated from the back by the backlight unit, the image is projected onto the document table through the slit, and the projected light image is projected on the carriage while scanning the film in the sub-scanning direction. Since it will be read while it is fixed, when the film size increases,
The device becomes large, the mechanism becomes complicated, the reading accuracy of the film image deteriorates, and in reality, the size at which the image of the film can be read cannot be expanded to the film size of the overhead projector (OHP). Therefore, in order to be able to read an image on a film having a wide size, the backlight device is required in addition to the above-mentioned one, and the operability is deteriorated and the cost is increased.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a document reading device which is small in size, inexpensive, and capable of accurately reading images of films of all sizes, by solving the above drawbacks.

[0007]

In order to achieve the above object, the invention of claim 1 is a projection unit for projecting an image of a transparent original, and an image sensor for reading a projected light image of the transparent original by the projection unit. And an A / D conversion means for converting an image signal from the image sensor into a digital multi-valued signal, an image reading apparatus scans a projected light image of a transparent original in a transparent original scanning mode and reads it by the image sensor. And a backlight mode means for scanning the transparent original in a backlight mode so that the image sensor reads the transparent original. In the image reading apparatus, the transparent original scanning mode means and the backlight mode means use different mirror units. Ri, the invention of claim 3, claim 1
In the image reading device described above, the projection unit is provided with slit width varying means for projecting an image of a transparent original through a slit and changing the width of the slit between the transparent original scanning mode and the backlight mode. According to a fourth aspect of the present invention, in the image reading apparatus according to the first aspect, the transparent document scanning mode, the backlight mode, and the light amount varying means for varying the light amount according to the size of the transparent document are provided. According to a fifth aspect of the present invention, in the image reading apparatus according to the second aspect, there is provided mirror unit changing means for changing the size of the mirror unit used by the backlight mode means according to the size of the transparent original.

[0008]

According to the present invention, in the transparent original scanning mode, the transparent original scanning mode means scans the projected light image of the transparent original and the image sensor reads it. In the backlight mode, the backlight original means transmits the transparent original. Is scanned and read by the image sensor.

According to a second aspect of the present invention, in the image reading apparatus according to the first aspect, mirror units having different transparent original scanning mode means and backlight mode means are used.

According to a third aspect of the present invention, in the image reading apparatus according to the first aspect, the projection unit projects the image of the transparent original through the slit, and the width of the slit is changed to the transparent original scanning mode by the slit width varying means. It can be changed with the backlight mode.

According to a fourth aspect of the present invention, in the image reading apparatus according to the first aspect, the light amount changing means changes the light amount according to the transparent original scanning mode, the backlight mode and the size of the transparent original.

According to the fifth aspect of the invention, in the image reading apparatus according to the second aspect, the size of the mirror unit used by the backlight mode means can be changed by the mirror unit changing means according to the size of the transparent original.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a film scan mode state of an embodiment of the present invention, and FIG. 2 shows a part thereof. This embodiment is an image reading apparatus for reading a film image in either a transparent original scanning mode (hereinafter referred to as a film scanning mode) or a backlight mode according to the size of a film and a reflective original. Is. In this embodiment, in consideration of the function, the size of the apparatus, the reading accuracy, and the cost, the negative film of 35 mm size and the positive film read the image in the film scan mode, and the size larger than that (4 ′ × 5 ′, 6 ′). X4 ', OHP size, etc.) images are read in the backlight mode. A user can select from the film scan mode and the backlight mode to read the image on the film by the operation unit depending on the size of the film. Basically, this embodiment is roughly divided into a projection unit (hereinafter referred to as a slide projector: SPU) for projecting a document image and a reading unit for reading a document. The reading unit has a frame 13, a printed circuit board 14 for analog signal processing, and a printed circuit board 15 for digital signal processing.

In the traveling body 10, a light source 16 composed of a fluorescent lamp for illuminating a reflection original on the original table 11, a converging light transmission body 17, a photoelectric conversion element 18, and a photoelectric conversion element 18 are provided.
Color correction filter 19 for correcting the color sensitivity balance of
Is held, and the photoelectric conversion element 18 is composed of an image sensor including a CCD. When reading the reflective original, the reflective original placed on the original placing table 11 is the light source 1.
6 and the reflected light image thereof is convergent light transmission body 17
Is imaged on the CCD 18 through the color correction filter 19 and photoelectrically converted into color image signals of three colors (R: red, G: green, B: blue). Although not shown, the traveling body 1
In 0, a substrate for driving the CCD 18 and C
A printed circuit board having an amplifier circuit for amplifying the output signal of the CD 18 is held, and the printed circuit board and the like are electrically connected to the printed circuit boards 14 and 15 via a cable 20.

When the reading section reads the reflection original,
When the operator turns on the start switch, the light source 16 is turned on to illuminate the film 21, and the traveling body 10 travels along the guide rod 12 by the drive source and the drive system including a motor (not shown) and the document table 11 Top film 2
1 is scanned in the sub-scanning direction at a speed according to the magnification. Then, the light image from the film 21 is formed on the CCD 18a via the converging light transmission body 17 and the color correction filter 19a to form a color image signal of three colors (R: red, G: green, B: blue). It is photoelectrically converted and read. The image signal from the CCD 18a is processed as described later. When the reading of the film 21 is completed, the light source 16 is turned off, and the traveling body 10 is returned to the home position by the motor.

On the other hand, in the SPU for projecting a transparent original, in the film scan mode, the 35 mm-sized film 21 held in the film cassette is set and pressed by the pressing glass 23 against the reference surface of the reference glass 22. Be held and held. The film 21 is an optical system 25 having a light source 24, which is a halogen lamp.
The illumination is performed by the light amount correction member 26, the color correction filter 27, and the slit 28a provided in parallel with the main scanning direction on the slit plate 28. The color correction filter 27 is for matching with the reading optical system. The optical image transmitted through the film 21 is enlarged by the projection lens 29.
Is magnified by and is folded back by the folding mirror 30. The optical image from the folding mirror 30 is the original table 11
It is projected on a projection plate 31 which is placed on top and has a diffusing surface on the lower surface, and is imaged on the CCD 18 through the document table 11, the converging light transmission body 17 and the color correction filter 19 to form R, G,
The B color image signal is photoelectrically converted. At this time, the traveling body 10 in the reading unit is stopped at a predetermined position, and the film 21 is moved along with the reference glass 22 and the holding glass 23 at a predetermined speed by the drive source 32 including the original film scanning motor to form an image. Are sequentially read line by line.

6 and 7 in the light mode.
As shown in FIG. 3, the mirror unit 33 including the folding mirror 30, the projection plate 31, the converging light transmission body 17, the color correction filter 19, and the CCD 18 in the film scan mode has a larger folding mirror 30a, converging light transmission body 17a, Color correction filter 19a and CCD1
8a, the slit plate 28 in the film scan mode is switched to the mirror unit 33a, and the slit 34a is larger than the slit 28a of the slit plate 28.
To the slit plate 34. If the user uses only the size up to 4'x5 ', the mirror unit 33a can use a slightly smaller size. Further, since the slit plate 34 having the large slit 34a and the large mirror unit 33a are used, a large amount of light of the light source 24 can be switched. Then, the film 21a having a size of 35 mm or more and sizes up to A4 size is used for the document table 11
It is placed at a predetermined position with the back side up. When the operator turns on the start switch, the light source 24 is turned on, and the film 21a is provided in parallel with the main scanning direction on the light amount correction member 26, the color correction filter 27, and the slit plate 34 by the optical system 25 having the light source 24 and the like. Slit 3
4a, the magnifying projection lens 29, and the folding mirror 30a to illuminate from the back side. Then, while the traveling body 10 travels along the guide rod 12 by a driving source and a driving system including a motor (not shown), the film 21a placed on the document table 11 is scanned in the sub-scanning direction at a speed according to the magnification. Then, the optical image from the film 21a is convergent in the optical transmission body 1.
7. An image is formed on the CCD 18a via the color correction filter 19a and photoelectrically converted into a color image signal of three colors (R: red, G: green, B: blue) to be read. CCD
The image signal from 18a is processed as in the film scan mode. When the reading of the film 21a is completed, the light source 24 is turned off, and the traveling body 10 is returned to the home position by the motor.

FIG. 3 shows the circuit configuration of this embodiment. SP
U is an SP centered on a microcomputer (CPU)
The U control unit 35, the driving source 31 including a document film scanning motor, the color correction filter 27 switching motor, the mechanical driving unit 36 including a light amount correction member 26 driving motor and a cooling fan, and the halogen lamp 24 are turned on. It has a lamp lighting circuit 37 for turning on, and a sensor section 38 including a sensor for detecting the film running bodies 21 to 23 at the home position and a cassette detecting sensor for detecting the film cassette.

The reading unit includes a scanner control unit 39 having a CPU as a center, a mechanical drive unit 40 including a motor and a cooling fan for driving the traveling body 10, a lamp lighting circuit 41 for driving the fluorescent lamp 16, and a traveling body. The sensor unit 42 includes a home position sensor that detects 10 at the home position and a sensor for detecting the wall temperature of the fluorescent lamp 16.

Further, in this embodiment, the image signal system including the printed circuit board has a CCD 18, a CCD 18a, an analog processing section 43, a shading correction circuit 44, and a digital processing section 45.

Films 21 and 21a or original placing table 1
The light image from the reflection original on 1 is CCD 18 or CCD 1.
It is photoelectrically converted into an analog image signal by 8a, is subjected to predetermined processing by the analog processing unit 43, and is output to the shading correction circuit 44. The shading correction circuit 44 reads the reference original and corrects the variations in the light amount distributions of the light sources 16, 24 and 24a and the sensitivities of the pixels of the CCDs 18 and 18a for each mode, and reads the analog processing unit 43.
The data obtained from the above is stored in the memory as shading correction data, and when the actual document is read, the shading correction data is read from the memory and the image signal is corrected from the analog processing unit 43 by this shading correction data. The digital processing unit 44 subjects the image signal from the shading correction circuit 44 to image processing such as scaling processing, γ conversion, and color conversion, and outputs the image signal to a printer unit or the like. Here, the digital processing unit 45 is a film, particularly 35.
When reading an image on a mm film, the image signal is converted into a signal equivalent to the image signal for the reflection original by gamma conversion and color conversion by a gamma conversion circuit.

The respective parts 18, 18a of these image signal systems,
43-45 operate by receiving a timing signal from the scanner control unit 39. An interface between the SPU control unit 35 and the scanner control unit 39 exchanges commands, statuses, and data by serial communication using an optical fiber. The SPU control unit 35 controls the operation of the entire SPU in response to a command from the scanner control unit 39, that is, controls the mechanical drive unit 36 and the lamp lighting circuit 37 while referring to the detection signal from the sensor unit 38 to read the reflection original. The operation is performed as described above. Further, the scanner control unit 39 controls the mechanical drive unit 40 and the lamp lighting circuit 41 based on the detection signal from the sensor unit 42 and the signal from the operation unit to perform the reading operation on the transparent original as described above, and Image signal system components 18, 18
a, 43 to 45 are controlled.

5 and 6 show the operation flow of this embodiment. This operation flow is divided into the following four steps (1) to (5). (1) The set-up operator selects one of the SPU mode (bullight mode, film scan mode) for reading the film and the reflection original mode by the operation unit, and the scanner control unit 39 selects which mode. Whether it is high or not is determined by an operation signal from the operation unit. Then, when the SPU mode is selected, the scanner control unit 39 issues a command to issue the SP
The power of U is turned on, the SPU is initialized, and each load is set to the initial state. In this case, in the SPU, the slit 28a of the slit plate 28 and the mirror unit 33 are set to be used in the film scan mode, and the slit 34a and the mirror unit 33a of the slit plate 34 are set to be used in the barite mode.

(2) Negative / Positive Select Next, the operator sets the positive mode or the negative mode according to the kind of film to be read by the operation section, and sets the positive color filter in the color correction filter 19 in the positive mode. In negative mode, set the color filter for negative.

(3) Shading data correct The operator does not set anything on the film holding members 22 and 23 in the positive mode according to the mode, and sets the negative orange base film on the film holding members 22 and 23 in the negative mode. To do.

After that, the operator gives an instruction to start the operation with the shading start key by the operation section, and the scanner control section 39 moves the traveling body 10 to the transparent original reading position. Next, the SPU control unit 35 causes the lamp lighting circuit 37 to light the light source 24 at the initial light amount value in response to a command from the scanner control unit 39, drives the original film, and moves the film drivers 21 to 23 to scan the shading data. When it is sent from the control unit 39 to the SPU control unit 35, the light amount correction member 26 is controlled so that the light amount from the light source 24 becomes an appropriate light amount. Then, the scanner control unit 39 causes the shading correction circuit 44 to store the output signal of the analog processing unit 43 in the memory as shading correction data. After that, the SPU control unit 35 makes the scanner control unit 3
In response to a command from 9, the light source 24 is turned off by the lamp lighting circuit 37, and the SPU control unit 35 is set to the film running bodies 21 to 25.
Is reversely scanned to move to the home position (HP).

(4) Prescan The film to be read is set on the film holding members 22 and 23 by the operator in the film scan mode and is pressed against the reference surface of the reference glass 22 by the pressing glass 23. 11 is set at a predetermined position. In the film scan mode, the SPU control unit 35 receives a command from the scanner control unit 39 in response to a command from the operation unit, and the lamp lighting circuit 37 receives the light source 2
After turning on 4, the original film scanning motor 31 is driven to move the film running bodies 21 to 23 to scan (prescan) the film 21. At this time, the SPU control unit 35 controls the light amount correction member 26 to set the light amount from the light source 24 to an appropriate light amount. Also, SP
In the backlight mode, the U control unit 35 causes the lamp lighting circuit 41 to turn on the light source 16 by receiving a command from the scanner control unit 39 in response to an instruction from the operation unit, and then drives the traveling body 10 by driving (not shown). Film 2
The scan (pre-scan) of 1a is performed. At this time, the SPU control unit 35 controls the light amount correction member 26 to set the light amount from the light source 24 to an appropriate light amount.

(5) Scanning Scan Next, in the film scan mode, the SPU control unit 35 drives the original film scanning motor 31 at a speed corresponding to the magnification set by the operation unit to drive the film running body 21.
Scan film 21 by moving ~ 23,
The projected image is read by the CCD 18 line by line.
The analog image signal from the CCD 18 is subjected to predetermined processing by the analog processing unit 43 and output to the shading correction circuit 44. The shading correction circuit 44 reads the shading correction data from the memory and uses the shading correction data to perform the analog processing unit 43. The image signal is calculated for each pixel to perform shading correction. The digital processing unit 45 is the shading correction circuit 4
Image processing such as scaling processing, γ conversion, and color conversion is performed on the image signal from 4 and output to a printer unit or the like. Further, in the backlight mode, by driving (not shown) the moving body 10 to scan the film 21a, and the projected image is read by the CCD 18a line by line. This CC
The analog image signal from D18a is the analog processing unit 43.
Predetermined processing is performed by the shading correction circuit 44.
Is output to the shading correction circuit 44, and the shading correction data is read from the memory and the image signal is calculated in pixel units from the analog processing unit 43 based on the shading correction data to perform shading correction.
The digital processing unit 45 subjects the image signal from the shading correction circuit 44 to image processing such as scaling processing, γ conversion, and color conversion, and outputs the image signal to a printer unit or the like.

The scanner control unit 39 causes the above-described reading operation for the transparent original film to be repeated that number of times when two or more reading operations (repeats) for the same transparent original film are set by the operation unit. Next, when the operator controls the scanner control unit 39 to set a film of the same type (whether the transparent original film is negative or positive) different from the read film and gives an instruction to read the same from the operation unit. Returns to the (4) prescan and causes the film image to be read in the same manner. Further, the scanner control unit 39 performs the above (2) Negative / Positive Select when the operator sets a different type of film (different film is negative or positive) from the operating unit and the reading is instructed. Return to read the manuscript.

When the operator sets the reflection original mode, the scanner control unit 39 causes the scanner control unit 39 to read the reflection original on the original table 11 as described above.
In this case, the scanner control unit 39 causes the lamp lighting circuit 37 to turn on the fluorescent lamp 16 and causes the motor to move the traveling body 10 to scan the reflection original, and the projected image thereof is scanned by the CCD 1.
8 reads one line at a time.

FIG. 8 shows a slit device according to another embodiment of the present invention. In this embodiment, instead of using the slit plates 28 and 34 in the above embodiment, a slit device as shown in FIG. 8 is used. A fixing plate 47 is fixed to the base 46, and the slit plate 48 has an opening 48.
a is movably fitted to the fixed plate 47 so that the guide rods 49, 5
It is attached so that it can move up and down. The slit plate 48 is provided integrally with the rack 51, and the pinion 52 is meshed with the rack 51, and the pinion 52 is connected to the motor 54 via a transmission mechanism having a belt 53. The slit plate 46 is moved to the belt 5 by the motor 54.
3 is driven in the vertical direction via a transmission mechanism having three, a pinion 52, and a rack 51, and an opening 48a of the slit plate 48 is formed.
The size of the slit formed by the non-closed part of the opening 48a of the slit plate 48 is changed by changing the part closed by the fixing plate 47. The size of this slit is the same as the size of the slit 28a of the slit plate 28 in the film scan mode by the motor 54 being controlled by the scanner control unit 39, and the size of the slit 34a of the slit plate 34 in the backlight mode. Will be the same.

FIG. 9 shows the structure of a folding mirror in another embodiment of the present invention. In this embodiment, a folding mirror 55 as shown in FIG. 9 is used instead of the folding mirror 30 in the above embodiment. This folding mirror has two mirrors 55, 5 with two mirror bodies.
6 is configured to be foldable by a hinge 57. Depending on whether the mirrors 55 and 56 are folded into one large mirror or the mirror 56 is folded and only the mirror 55 is used as a small mirror. It can be changed. The size of the folding mirror can be changed by the scanner controller 39 according to the size of the film. This folding mirror is mirror 5
When 6 is folded, it becomes smaller and takes up less space. The folding mirror may be slid to change its size.

[0033]

As described above, according to the present invention, the projection unit for projecting the image of the transparent original, the image sensor for reading the projected light image of the transparent original by the projection unit, and the image from the image sensor. An image reading apparatus having an A / D conversion unit for converting a signal into a digital multi-valued signal, and a transparent original scanning mode means for scanning a projected light image of a transparent original in a transparent original scanning mode and causing the image sensor to read the image. Since the backlight mode is provided for scanning the transparent original in the backlight mode and causing the image sensor to read the transparent original, the transparent original scanning mode and the backlight mode are selected according to the size of the transparent original. The image of the original can be read, and the image of all sizes of films can be read accurately with a small size and at low cost.

[Brief description of drawings]

FIG. 1 is a sectional view showing a film scan mode state of an embodiment of the present invention.

FIG. 2 is a perspective view showing a part of a film scan mode state of the embodiment.

FIG. 3 is a block diagram showing a circuit configuration of the embodiment.

FIG. 4 is a flowchart showing a part of an operation flow of the embodiment.

FIG. 5 is a flowchart showing another part of the operation flow of the embodiment.

FIG. 6 is a sectional view showing a barite mode state of the embodiment.

FIG. 7 is a perspective view showing a part of a backlight mode state of the embodiment.

FIG. 8 is a perspective view showing a slit device according to another embodiment of the present invention.

FIG. 9 is a perspective view showing the structure of a folding mirror according to another embodiment of the present invention.

[Explanation of symbols]

10 running bodies 11 Platen 16,24 light source 19 Image sensor 21,21a film 31 Projection board 33, 33a Mirror unit 47 fixed plate 48 slit plate 54 motor 55,56 mirror 57 hinge

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Hiroshi Shijo             1-3-3 Nakamagome, Ota-ku, Tokyo, stock             Company Ricoh

Claims (5)

[Claims] 1. A projection unit for projecting an image of a transparent original, an image sensor for reading a projected light image of the transparent original by the projection unit, and an image signal A from the image sensor for converting the image signal from the image sensor into a digital multilevel signal. In an image reading apparatus having an A / D conversion means, a transparent original scanning mode means for scanning a projected light image of a transparent original in a transparent original scanning mode and causing the image sensor to read the image, and a transparent original in the backlight mode. And a backlight mode unit for causing the image sensor to read the image sensor. 2. The image reading apparatus according to claim 1, wherein the transparent original scanning mode means and the backlight mode means use different mirror units. 3. The image reading apparatus according to claim 1, wherein the projection unit projects an image of a transparent original through a slit, and a width of the slit is changed between the transparent original scanning mode and the backlight mode. An image reading apparatus comprising a width varying means. 4. The image reading apparatus according to claim 1, further comprising a light amount changing means for changing a light amount according to the transparent original scanning mode, the backlight mode, and the size of the transparent original. apparatus. 5. The image reading apparatus according to claim 2, further comprising mirror unit changing means for changing the size of the mirror unit used by the backlight mode means according to the size of the transparent original. .