JPH05316286A - Picture reader - Google Patents

Abstract

PURPOSE:To simplify the structure without moving a light receiving surface and to minimize the entire device by providing means for varying power to make an automatic variable power according to the size of originals and corresponding to the variable power width. CONSTITUTION:An original image 11 is focused on a light receiving surface 112 through a projection lens 15. A scan mirror 12 is provided between the original 112 and the lens 15 to scan the image 11. Further, a means detecting the size of the original 11 and a reflection means are provided. The reflection means is located between the lens 15 and the light receiving surface 112, changing the light path length by switching the number of mirrors 16, 17, and 18 reflecting the projection light. Based on the detection signal of the detection means, the number of using mirrors of the reflection means is changed. Then the variable power according to the size of the original 11 can be performed, simplifying the structure and minimizing the entire device. Accordingly, the change can be automatically performed by the size of the original and no special operation by a user is required, resulting in preventing errors due to a misoperation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image reading device,
More specifically, the present invention relates to an image reading apparatus having a scanning mirror for forming an image of a document on a light receiving surface via a projection lens and scanning the document image between the document and the projection lens.

[0002]

2. Description of the Related Art An image reading apparatus of this type is disclosed in Japanese Patent Laid-Open No.
There is one disclosed in JP-A-246965 (conventional example 1). This one has multiple mirrors in front of the projection lens,
By arranging one of the mirrors on the optical path or retracting it from the optical path, the optical path length in front of the projection lens is changed according to the size of the original, and the projection magnification is switched. Further, by changing the projection magnification, two scanning means provided in front of the projection lens are switched and used.

Further, Japanese Laid-Open Patent Publication No. 60-96068 discloses an image reading magazine according to the size of the film to be read, and the type of the magazine is detected to read the image. A device in which the scanning length and the like are switched is disclosed (conventional example 2).

[0004]

When the original is a film, there are various sizes such as a 35 mm plate film, a 6 cm plate film, and a 4 × 5 in plate film.

To read these images, a one-dimensional illumination system is adopted, and an image of an illuminated original is formed on the entire surface of the image pickup device with a variable magnification operation of the optical system regardless of the film size. It is conceivable to read it.

As a result, the image pickup device can be effectively used for any size film.

In this case, it is necessary to change the scanning length of the scanning mirror depending on the size of the film, and at the same time, the scaling operation is required. Can be satisfied.

However, a large variable magnification width is required to cope with the various film sizes.

Further, when a manuscript of various sizes is recorded as an image of a required size by a copying machine or the like, it is desired to have a larger magnification.

In this respect, the prior art example 1 is suitable only for a small magnification range of reduction to a uniform size, and when a large-sized original is read, the original image is scanned by the mirror at the time of projection magnification, and the small-sized original is read. At the time of projection magnification when reading an original, the original image is scanned by the lens and the light receiving surface for image reading, and two scanning means must be selectively used for variable magnification, so the structure and control are complicated. .. Further, increasing the variable magnification width causes further complication and size increase of the structure, and is not suitable for a device for reading a film image which is a relatively small original. Further, the movement of the light-receiving surface leads to the lead wire connected thereto, which makes mechanical design difficult.

In addition, it is troublesome for the user to perform each operation in accordance with the size of the original in order to perform the above-mentioned scaling, and it sometimes happens that an image reading failure is caused by an erroneous operation. However, this is solved. Things have not been provided previously.

Therefore, according to the present invention, by changing the method of changing the number of mirrors used, it is possible to automatically change the magnification in accordance with the size of the original, and to cope with a large variation width without moving the light receiving surface. It is an object of the present invention to provide an image reading device which can be made simple and can be simplified in structure and downsized.

[0013]

In order to achieve the above object, the present invention forms an image of a document on a light receiving surface through a projection lens and scans the document image between the document and the projection lens. In an image reading apparatus having a scanning mirror for scanning, a reflection means for changing the optical path length by switching the number of original size detecting means and the number of mirrors arranged between the projection lens and the light receiving surface for reflecting the projection light. And a means for switching the number of used mirrors of the reflecting means based on the detection signal of the detecting means.

The reflecting means includes a first mirror that scans the original document, second and third mirrors that move at a speed of V / 2 with respect to the scanning speed V of the first mirror, and these first to first mirrors. 3 mirrors, and 4th and 5th mirrors that reflect the light that has passed through the projection lens, and 6th mirror that guides the light from the 5th mirror to the light receiving surface. Each mirror of 6 is on one movable unit, and the movement of this unit can direct the light from the fourth mirror directly to the light receiving surface.

Further, the scanning speed of the first mirror can be changed according to the size of the original, and the scanning speed of the first mirror can be automatically changed by a detection signal from the detecting means.

[0016]

According to the above construction of the present invention, the switching means performs the variable magnification operation for switching the number of mirrors used in the reflecting means in accordance with the original size detection signal from the detecting means, so that the image of the original is received by the projection lens. The projection magnification when the image is read by projecting it onto the surface can be automatically switched according to the size of the original.

The reflecting means is arranged between the projection lens and the light-receiving surface to switch the number of mirrors used to reflect the projection light, and change the optical path length in the optical path without the scanning mirror to change the magnification. As a result, the optical path length from the projection lens to the light receiving surface can be increased with a small number of mirrors and a small space by forming a free optical path that is not affected by the reflecting means and the scanning mirror on the light receiving surface. The change in length is also increased to obtain a large variable width, and an image can be read without moving the light receiving surface.

The reflecting means includes a first mirror for scanning the original document, second and third mirrors for moving at a speed of V / 2 with respect to the scanning speed V of the first mirror, and these first to first mirrors. And a fourth mirror for reflecting the light passing through the projection lens, and a sixth mirror for guiding the light from the fifth mirror to the light receiving surface. Three kinds of projection magnifications can be obtained by two kinds of positions of the lens and two kinds of positions of the fourth and sixth mirrors, and the optical switching efficiency for the magnification change is improved. Each mirror of 6 is on one movable unit, and when the movement of this unit allows the light from the fourth mirror to be directly guided to the light receiving surface, the projection light is directly guided from the fourth mirror to the light receiving surface. In the case of moving the fourth mirror to a predetermined position and throwing the sixth mirror. And retracted from the optical path it can be performed on homologues manner.

Further, if the scanning speed of the first mirror is changed according to the document size, the scanning time, that is, the image reading time can be made constant even if the scanning length corresponding to the document size is different.

Further, the change of the scanning speed of the first mirror is
If the detection signal from the detection means is used, the manual operation can be dispensed with.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings.

The present embodiment shows the case of a color image reading apparatus adapted to read an image on a color film. The image reading data is variously processed and inputted to an external device such as a digital copying machine, and based on the above-mentioned processing. It is used for obtaining various copied images.

FIG. 1 shows a schematic configuration of the apparatus of this embodiment as seen from the front. As shown in FIG. 1, a color CRT 2 for displaying a read image and performing various processing operations is provided on an upper part of an apparatus main body 1 for reading an image and processing a signal.

The film 11 to be used for image reading is held on the film carrier 3 and loaded in the film carrier holder 611 shown in FIG. 1 in the direction of arrow a to be used for image reading.

The film carrier holder 611 can be movable together with the film carrier 3 in the direction of arrow b. As a result, the film 11 is 35 mm
A predetermined frame in the case of a continuous film of a plate can be aligned on the projection optical path for image reading.

The lamp unit 41 for illuminating the image on the film 11 includes a front door 62 of the apparatus body 1.
1 is opened and inserted into the apparatus main body 1 from the front side to the back side so as to be replaceably mounted.

The opening / closing of the front door 621 is detected by a switch 622, and the switch 622 is turned off when the front door 621 is opened. As a result, the power of the apparatus main body 1 is turned off.

FIG. 2 shows a schematic structure of the image reading apparatus when the apparatus body 1 is viewed from above. In the image reading apparatus of this embodiment, a film 11 for reading an image and a color CCD sensor 112 for reading a film image are fixed 1.
Dimensional line lighting system is adopted.

Therefore, in order to read the data in the sub-scanning direction, the illumination unit 113 and the first, second and third mirrors 12, 13 and 14 reciprocate.

In FIG. 2, the illumination unit 113 and the first, second, and
Each third mirror 12, 13, 14 is shown in solid line at the scan start position.

The color image reading apparatus according to this embodiment also illuminates films 11 having different sizes and projects the transmitted light onto a predetermined size portion of the color CCD sensor 112,
In order to read an image by utilizing the resolution of the color CCD sensor 112, the color C of the optical system is changed depending on the film size.
The image forming magnification on the CD sensor 112 is changed so that an image of any size is formed on the entire area of the color CCD sensor 112.

Specifically, in the case of a 35 mm plate film, x
2.550, x 0.947 for 6 cm film
In the case of a 4 × 4 × 5 inch film, it is × 0.5734.

However, this is the case where the short side direction of the film 11 is the main scanning direction of the color CCD sensor 112.

The projection magnification is changed by changing the conjugate length. This is done by changing the positions of the second and third mirrors 13 and 14, the imaging lens 15, and the lens rearview mirrors 16 and 17.

Unlike the change of the optical magnification, the data scaling process is performed by making the scan speed variable in the sub-scanning direction and electrically processing the data in the main scanning direction.

The relationship between the film 11 and the positions of various components will be described. The illumination unit 113 and the first mirror 12 are reciprocally driven by a scanner motor 632 which is a stepping motor so that the illumination slider 113 and the first mirror 12 can be moved together by the scanning slider 631, and the forward movement is performed. Sometimes the image on film 11 is scanned and color C
The images are sequentially projected onto the CD sensor 112.

SH0 is the illumination unit 113 and the first mirror 1.
2 is a photo sensor for detecting the home position of No. 2.

The first mirror 12 is held by a first mirror unit 701 as shown in FIG. 3, which is fixed to a scanning slider 631 attached to a wire 702 driven by the scanner motor 632 with a screw 704.
The scanning becomes possible.

Further, the scanning slider 631 has a pin 705, which is fitted in the hole of the passive piece 706 of the illumination unit 703 of the illumination unit 113 and holds the first mirror 12 as a unit to illuminate. The unit 113 can be moved together with the scanning of the first mirror 12. However, these specific support structures can be modified in various ways. For example, the first mirror 12 and the illumination unit 703 can be directly supported by the scanning slider 631.

The second and third mirrors 13 and 14 are shown in FIG.
The wire 702 is integrally held by the mirror slider 633 attached to the movable pulleys 707 and 708 around which the wire 702 is wound, and is synchronized with the scanning by the first mirror 12 with respect to this scanning speed V. It is moved at a speed of V / 2 to prevent a change in the optical path length during the scanning.

Wire 702 is endless and is shown in FIG.
As shown in FIG. 7, the drive pulley 709 directly connected to the scanner motor 632 is partially wound around the driven pulley 709.
11, 712 and the conjugate length correction pulley 713 connected to the conjugate length correction motor 634 and the movable pulleys 707, 7
It is also wound on 08.

When the wire 702 is driven by the drive pulley 709, the wire 702 is circularly moved at a speed V, and the scanning slider 631 is moved together with the wire 702, so that the first mirror 12 and the illumination unit 113 are moved at a speed V. The scanning is performed by moving.

At the same time, the movable pulleys 707 and 708 are moved together with the mirror slider 633 at a speed of V / 2, and the second and third mirrors 1 are moved during the scanning by the first mirror 12.
3 and 14 can be moved at the speed of V / 2 as described above.

Further, the wire 702 is the conjugate length correction pulley 71.
Since the drive pulley 709 does not rotate when driven by the wire 3, the wire 702 partially moves along with the movement of the movable pulleys 707 and 708, and the second and third mirrors 13,
Only 14 is moved to correct the conjugate length associated with zooming.

The wire 702 has a spring 7 between both ends.
They are connected by 14.

As shown in FIG. 2, the positions of the second and third mirrors 13 and 14 at the start of scanning due to the above-mentioned zooming for each film size are, as shown in FIG. The position of the one-dot chain line in the case of the plate film is the position of the two-dot chain line in the case of the 4 × 5 in plate film, and FIG. 5 shows the state of the optical system in the case of the 35 mm plate film. The state of the optical system in the case of the film is shown, and the state of the optical system in the case of the 4 × 5 in plate film is shown by a virtual line in FIG.

Each of these positions is connected to the photo sensor SH35,
It is detected by SH60 and SH45, respectively.

The imaging lens 15 is held by a lens slider 635, and a lens motor 63 which is a stepping motor.
It is reciprocally driven by 6 to perform the magnification change. Positioning control of the imaging lens 15 includes a 35 mm plate film and 6
The same position shown by the solid line in FIG. 2 may be used for the cm plate film, and the position shown by the alternate long and short dash line is set only for the 4 × 5 in plate film.

The respective positions of the projection lens 15 are detected by photosensors SL35 and SL45.

The lens rearview mirrors 16 and 17 are integrally held by a mirror stider 637 and reciprocally driven by a mirror motor 638 which is a stepping motor.

The lens rear-view mirrors 16 and 17 are 35 m
For the m-plate film, the position shown by the solid line in FIG. 2 is set so as to cooperate with the lens back fixed mirror 18, and 6c
For m plate and 4 x 5 in film,
It is located at the position indicated by the alternate long and short dash line so as to operate independently of the fixed mirror 18.

For this reason, the lens back fixed mirror 18 used for image reading of the 35 mm plate film is fixed at the position shown by the solid line in FIG. Located in its optical path, but with a 6 cm plate film and 4x
The lens rear-view mirrors 16 and 17 that have reached the position indicated by the alternate long and short dash line in the 5-inch film reading are deviated from the optical path.

The control positions of these lens rearview mirrors 16 and 17 are detected by photosensors SM35 and SM45.

According to the optical system as described above, it is possible to deal with the variable magnification according to the size of the original with a large variable width without the movement of the light receiving surface, so that the structure of the image reading apparatus can be simplified and downsized. Can be planned.

Further, two kinds of positions of the projection lens 15 and
The three types of projection magnifications can be obtained by the two types of positions of the lens rearview mirrors 16 and 17 which are the fourth and sixth, and the optical switching efficiency for zooming is improved. Is on one movable mirror slider 637, and when the movement of this mirror slider 637 allows the light from the lens rearview mirror 16 which is the fourth mirror to be directly guided onto the color CCD sensor 112 which is the light receiving surface, When the projection light is directly guided from the lens rearview mirror 16 onto the color CCD sensor 112, the movement of the lens rearview mirror 16 to a predetermined position and the withdrawal of the lens rearview mirror 17 from the projection optical path can be performed together.

In FIG. 2, when the projection lens 15 and the mirror slider 637 having the lens rear-view mirrors 16 and 17 take two types of positions, the movement amount of the projection lens 15 is l ₁ and the movement amount of the mirror slider 637 is l. _{If 2} ,
The optical path length L behind the projection lens 15 is L ₁ = l ₁ + 2l ₂ + A L ₂ = l ₁ + A L ₃ = 2l ₂ + A L ₄ = A where A: constant, A =
Four types of optical path lengths, a ₁ + a ₂ + a ₄ , can be selected.

[0057] However L _1, when determining the _{L 2 ~L 4 L 1 = l} 1 + 2l 2 + A = (L 2 -L 4) + (L 3 -L 4) + L 4 = L 2 + L 3 -L 4 Since it is automatically determined, there are three types of magnification that can be actually designed.

Therefore, when the optical path length behind the projection lens is determined from the magnification and the focal length of the projection lens 15, by considering the above settings of l ₁ , l ₂ and A,
3 types of magnification can be freely designed.

Projection lens 15 and lens slider 6
By using only two positions of 37 positions, as shown in FIG. 6, it is only necessary to move to the position where the stoppers 721 and 722 come into contact, and the position control becomes easy.

The optical path length in front of the projection lens 15 can be freely set by the mechanism of this embodiment, and the position (optical path length) of each of the second and third mirrors 13 and 14 is determined by the photosensor SH35, It is detected and controlled by SH60 and SH45.

If three or more types of magnification are applicable,
The position of the projection lens 15 may be set to three or more types, and the position determination in this case may be performed by using a known zoom mechanism or the like.

The focal length of the projection lens 15 is f = 102 m.
An example of the case of m is as shown in FIG. 17, and L ₁ = l ₁ + 2l ₂ + A = 343 mm (in the case of 35 mm plate film) L ₂ = l ₁ + A = 183 mm (in the case of 6 cm plate film) L ₄ = A = 145 mm (in the case of 4 × 5 inch film).

Therefore, A = 145 mm l ₁ = 38 mm l ₂ = 80 mm.

The movement of the projection lens 15 is performed because there are three types of magnification changes. However, when performing two types of magnification changes, the mirror is moved and the mirror behind the projection lens 15 is moved. It can be handled sufficiently by switching the number of sheets used.

Just before the color CCD sensor 112, 4
A filter unit 25 equipped with types of filters 21, 22, 23, 24 is provided.

The filter section 25 is provided with a quantity of light to the color CCD sensor 112, R,
It has the function of matching the balance of G and B.

The filter 21 is a filter inserted during an actual operation of reading an image on a negative film, and is, for example, L
B100 or the like is used.

The filter 22 is a filter inserted during an actual operation of reading an image on a positive film, and is, for example, N.
A D filter or the like is used.

The filter 23 is a filter inserted when the shading correction data of the negative film is fetched.

The filter 24 is a filter inserted when the shading correction data of the positive film is fetched.

The reason why the filter is divided between the actual operation and the time of capturing the shading correction data is that there is no film at the time of capturing the shading correction data.
This is because the amount of light and the balance are different because the film is present during actual operation, and this is corrected.

The filter switching operation of the filter section 25 is performed by a stepping motor (not shown) in the same manner as in the case of the mirror or the like.

As an auxiliary mechanism for this, a photo sensor 26 for detecting the right limit position and a photo sensor 27 for detecting the left limit position of the filter portion moving range are provided.

When the filter section 25 is provided in front of the color CCD sensor 112, the filters 21, 22, 23 and 24 are made to have a minimum size substantially equal to that of the color CCD sensor 112, and a margin necessary for this is provided. The filter unit 25 can be small.

As shown in FIGS. 2, 3 and 7, the illuminating section 113 includes a replaceable lamp unit 41, an optical path folding mirror 42, a heat insulating filter 43 shown in FIG. And a lens-shaped lens 44 having a surface.

With the above structure, the film carrier 3 is mounted on the film carrier holder 611 located between the illumination unit 113 and the moving parts of the first, second and third mirrors 12, 13 and 14. The light from the lamp unit 41 is guided to the formed film 11 to illuminate it, and the image of the film 11 is colored C by the imaging lens 15.
An image is formed on the CD sensor 112.

The folding mirror 42 is a halogen lamp 45 which is set in the lamp unit 41 in a horizontal posture.
Is provided to guide the illumination light from the film to the film vertically arranged at a position higher than the lamp installation position.

The kamaboko lens 44 is provided to improve the light-collecting property, and compensates for the fact that the distance between the halogen lamp 45 and the film 11 is increased by the folding mechanism insertion by the folding mirror 42 and the light amount is reduced. Further, the diffusing surface is for making dust and the like attached to be inconspicuous on the projected image.

The lamp unit 41 has a box shape as shown in FIG. 8, and a light projecting window 46 is provided on the upper surface. This projection window 46 opens when the lamp 45 is attached,
A shutter 47 that closes when the lamp 45 is not attached is provided.

As shown in FIGS. 8 and 9, the lamp unit 41 includes a reflection shade 48 for directing light from the lamp 45 to the light projecting window 46, a temperature fuse 49, and the lamp unit 41.
Short line 50 with the ground to determine the type of
It has a connector 51 for making an electrical connection with the device body 1 when the lamp unit 41 is attached to the device body 1, and the appearance is common except for the connector 51.

The short line 50 has a 2-bit code set in advance. The CPU 200 shown in FIG. 13 shows the connection state of the two short lines 50 by the parallel I / O port 2.
From 06, data is taken in and identified.

FIG. 1 shows the types of the lamp unit 41.
Lamp 45a for 35 mm plate film shown in 0 (a)
Mounted with the lamp 45b for the 6 cm plate film shown in FIG. 7B, 4 × shown in FIG.
3 of those equipped with a lamp 45c for 5 inch film
There are types, and they are exchanged as needed.

These lamps 45a to 45c are used for the film 1
As the size of No. 1 becomes larger, the effective light emitting section 45d becomes longer.

By the way, if the lamps 45 are used in common, a huge number of W lamps 45 are required, and power is consumed more than necessary when projecting a small-sized film 11. This is a particular problem when using the film 11 which has a low tolerance to temperature.

By changing the kind of the lamp 45 according to the size of the film 11 as described above, such a problem can be solved. However, each lamp 45a-4
5c is properly selected according to the size of the film 11,
Must be used.

In order to guarantee this, the type of the lamp unit 41 mounted on the apparatus body 1 is automatically detected and dealt with as described above.

The film carrier 3 is a film carrier 3a for 4 × 5 in plate film shown in FIG.
A film carrier 3b for a 6 cm plate film shown in FIG. 6B, a film carrier 3c for a 35 mm plate continuous film shown in FIG. 7C, and a film carrier 3d for a 35 mm plate mount film shown in FIG. There are four types.

The film carrier 3b for 6 cm plate film has a 6 × 9 mm plate projection window 3e, and the size of the 6 cm plate film is 6 × 4.5, 6 × 6,
There are various types such as 6x7 and 6x9 so that they can be dealt with.

Each of the film carriers 3a to 3d has a front side 2
A single holding plate is opened and closed with an upper hinge connection portion as a fulcrum so that the film 11 can be sandwiched and pulled out.

The film carriers 3a to 3d have the same outer dimensions, and the receiving conditions on the apparatus main body 1 side are unified to simplify the configuration on the apparatus main body 1 side and the attaching / detaching operation thereof.

There is a distinction between the film carriers 3a to 3d in which the positions and the number of the type detecting holes 61 are different from those in which the holes 61 are not provided. The type is detected optically.

Further, the film carriers 3a to 3d include
Corresponding to each film projection window 3e, a set detection hole 62 for detecting each proper set position of the film carrier 3 is provided, and each film carrier 3a to 3d.
It is possible to optically detect that the film 11 held by is properly set on the projection optical path.

As shown in FIG. 12, the film carrier holder 611 for holding the film carrier 3 has transmission type photosensors 162 and 163 for detecting the type of the film carriers 3a to 3d, and film carriers 3a to 3d. The transmission type photo sensor 164 for detecting whether or not the film carrier holder 61 is attached.
The film carriers 3a to 3d mounted on the No. 1 are incorporated in such a manner as to sandwich them.

Further, in the vicinity of the position where the film carrier holder 611 of the apparatus main body 1 moves, the film carriers 3a to 3a mounted on the film carrier holder 611 are attached.
A transmissive photosensor 165 for detecting the set position state of d is provided so as to sandwich the film carrier holder 611.

As shown in FIG. 13, the color CRT 2 is a monitor display section 71 for displaying an image read from the film 11, setting a copy mode, and setting a trimming area.
In addition to the operation panel 72 for instructing the printing operation, it has an internal panel (not shown).

The monitor display section 71 mainly has the following display sections.

Image display area 81: The read film image is displayed.

Message display section 82; a warning when the size of the loaded film does not correspond to the type of the lamp unit 41, replacement of the lamp unit 41, necessary type of the lamp unit 41, film carrier 3 types, messages such as shading correction data acquisition display, film carrier pull-out display, etc. are displayed, and the type of film and output paper size are displayed.

The operation panel 72 mainly includes the following operation members.

Stop key 95: Instruct to interrupt copying or image input.

Image input key 96: Instructs to read a film image and display it on the color CRT 2.

Print key 97: Instruct to start copying.

FIG. 14 shows a block diagram of a circuit diagram around the CPU 200. CPU200 is program RO
The entire device is controlled based on the contents of the program stored in M201.

The following are mainly connected to the periphery of the CPU 200 by a CPU address bus and a CPU data bus.

EEPROM 202: Stores parameters for adjusting variations of each device, for example, set voltage for each type of the lamp unit 41 corresponding to each film size. It is electrically readable and writable.

RAM 203: Stores variables necessary for executing the program.

Communication port 205; exchanges information with external devices.

Parallel I / O port 206: Outputs a control signal for controlling the peripheral device and inputs a status signal of the peripheral device.

Input image memory 207; color CC
The image data read by the D sensor 112 is input through the image processing circuit 651, directly written, and stored.

AGDC 210: Controls the display of the color CRT 2 by controlling the contents of the VRAM 211.

The followings are connected around the AGDC 210 by an AGDC bus and an AGDC data bus.

VRAM 211: Stores data relating to display control of the color CRT 2.

Kanji ROM 212: Generates kanji character data from kanji code.

Work RAM 213; VRAM 21
It is used as a work area when controlling the contents of 1.

The CPU address bus and the AGDC address bus, and the CPU data bus and the AGDC data bus are connected to each other via the AGDC 210.

FIG. 15 shows the main signal input / output unit centering on the parallel I / O port 206. The scanner motor drive circuit 301, the lamp control circuit 305, the lamp unit 41, the lens drive circuit 306, and the operation panel. 72,
The mirror driving unit 308 is connected.

The scanner motor drive circuit 301 is a CPU
A circuit for moving the first, second, and third mirrors 12, 13, 14 and the illumination unit 113 at a predetermined speed in accordance with an instruction from the scanner 200, and a scanner motor 632,
The conjugation length correcting motor 634 is controlled to drive the ramp slider 631 and the mirror slider 633. For position control at this time, the photosensors SH0, S0
The H35, SH60 and SH456 are connected so that position information can be obtained.

The scanner is controlled by the following signals.
Since it is a known one, its explanation is omitted.

Motor drive signal: Instructing the motor feed speed.

Forward / reverse rotation signal: Instructs the rotation direction of the motor.

Scan home position detection signal: Indicates that the scanner is at the home position.

Regarding the film carrier detection, the type of the film carriers 3a to 3d is discriminated and the presence or absence of the film carrier 3 is detected, and the following signals are mainly used.

Carrier set signal: Indicates that the film carrier 3 is attached to the apparatus main body 1.

Film type detection signals 1 and 2; Film 1 depending on the difference between the film carriers 3a to 3d set by the combination of the photo sensors 161 and 162
The type of 1 is determined.

The combination of the film type detection signals 1 and 2 and the type of the film 11 designated by the combination are shown in Table 1.

[0126]

[Table 1]

The lamp control circuit 305 controls the light amount and lighting of the lamp 45. The DC voltage applied from the lamp control circuit 305 to the lamp 45 is the lamp unit 4
1 is supplied.

The signals used for this control are as follows.

Output voltage setting signal: a signal for setting the voltage applied to the lamp 45, which is given as a 5-bit signal.

Lamp on / off signal; lamp 45
Controls turning on / off of.

Abnormality detection signal: An abnormality such as lamp burnout or abnormal lighting is detected.

The lamp unit 41 needs to be selected and used according to the type of the film 11. For this reason, the lamp unit type detection signals 1 and 2 have been described above.

Is used.

Here, the lamp unit type detection signals 1, 2
Table 2 shows the relationship between the combination of No. 1 and the type of lamp unit 41 and the presence / absence of attachment.

[0135]

[Table 2]

The lens driving circuit 305 includes an imaging lens 15
The position is switched depending on the size of the film 11 used, and the lens position is controlled by the following signals.

Therefore, the lens driving circuit 305 is connected to the lens motor 635 and the photosensors SL35 and SL45 for detecting the lens position.

Positioning is based on management of the number of driving steps from the signal from the reference position detection sensor.

Driving signal: Controls driving and stopping of the lens driving motor.

Forward / reverse rotation signal: Designates the driving direction of the lens drive motor.

Position detection signal: Indicates that the lens is at the reference position.

The mirror driving unit 308 changes the positions of the lens rearview mirrors 16 and 17 in order to change the image forming magnification of the optical system according to the size of the film 11, and the positions of the lens rearview mirrors 16 and 17 are as follows. It is controlled by the following signals.

For this reason, the mirror driving unit 307 is connected to the mirror motor 638 and the photosensors SM35 and SM45 for detecting the mirror position.

Positioning of the lens rear-view mirrors 16 and 17 is performed by managing the number of driving steps from the signals of the respective reference position sensors.

Lens rear-view mirror drive signal: The lens rear-view mirrors 16 and 17 are driven and stopped.

Position detection signal: Indicates that the lens rearview mirrors 16 and 17 are at the reference position.

Forward / reverse rotation signal: Instructing forward / reverse rotation of the lens rearview mirrors 16 and 17 parts.

The parallel I / O port 206 has input / output signals for exchanging signals with the digital copying machine.

As the image processing circuit, although not shown, the following signals are exchanged with the copier other than the communication line to transmit the image data.

Power-on signal: Indicates the power-on / off state of the printer unit.

Image data request signal: Shows the transmission timing of the image signal.

Horizontal effective area signal: Indicates a printable area in the horizontal direction.

Vertical effective area signal: Indicates the printable area in the vertical direction.

Print wait signal: Indicates a state in which the image signal cannot be transmitted.

Selector switching signal: Instructs switching of the image signal in the image processing circuit.

By the way, if the lamp unit 41 is not attached, even if the image on the film 11 is read, it may be a black solid image, and the reading becomes useless, whether the image on the film 11 is black or illuminating. It is not clear whether the system or other causes are the cause, and it is difficult to use and inconvenient to use.

Also, the lamp unit 41 installed
If the type does not correspond to the size of the mounted film 11, the halogen lamp 45 provided in the lamp unit 41 may have an excess or deficiency in the effective light emission length or the total light emission amount, which may cause a problem in reading the film 11. The illumination light is wasted.

Therefore, in this embodiment, it is possible to cope with the case where the type is different, and when the film size is specified, the magnification of the optical system is automatically changed so as to obtain the projection magnification corresponding to this. ing. As a result, the scaling according to the film size is achieved without any special operation by the user, which is convenient for use. In addition, image reading failure due to erroneous operation is eliminated.

This control will be described with reference to the subroutine of the relation processing between the lamp unit and the film carrier shown in FIG.

First, in step # 1, a state check is executed. When the state is 0, it is checked in step # 2 whether the lamp unit 41 is present.

Here, the state is initialized to 0 immediately after the power of the apparatus main body 1 is turned on.

When the lamp unit 41 is replaced, the power source is necessarily turned off by hardware due to the off state of the switch 622 when the front door 621 is opened. Therefore, the state is initialized to 0 in this case as well.

When it is determined in step # 2 that the lamp unit 41 is not present, the process proceeds to step # 4 and it is determined whether or not the film carrier 3 is present. Here, when the film carrier 3 is not present, that is, when the lamp unit 41 and the film carrier 3 are not present when the power is turned on,
In step # 8, the message display section 82 of the color CRT 2 displays so that the lamp unit 41 should be mounted,
This subroutine ends.

If it is determined in step # 4 that there is the film carrier 3, the process proceeds to step # 5 to identify the type of the film carrier 3, that is, the film size,
In the next step # 6, switching control to an optical system suitable for the film size is executed.

Specifically, the imaging magnification of the color CCD sensor 112 of the optical system is changed in accordance with the size of the mounted film (the movement of the second and third mirrors 14 and 15, the imaging lens). Movement of 15, lens rearview mirror 16,
17 movements) are performed.

Subsequently, the process proceeds to step # 7, and since there is no lamp unit 41, it is necessary to mount the lamp unit 41 suitable for the film carrier 3 in the color CR.
The message is displayed on the message display portion 82 of T2, and this subroutine is finished.

When it is determined in step # 2 that the lamp unit 41 is present, it is determined in step # 2a whether or not the film carrier 3 is present. If the film carrier 3 is not present, the type of the mounted lamp unit 41 is identified in step # 2b, and the optical system suitable for the lamp unit 41 is switched in step # 2c.

Next, at step # 2d, the film carrier 3 suitable for the lamp unit 41 is displayed on the message display portion 82 of the color CRT 2, and at step # 3 the state is set to 1 and this subroutine is finished.

If the film carrier 3 is present in step # 2a, the process proceeds to step # 31, in which the message display section 82 displays a message requesting that the film carrier be pulled out.
To do. This is because it is necessary to capture data for shading correction when the power is turned on, and if the film carrier 3 is present at that time, normal data cannot be obtained.

Next, the type of the film carrier 3 set in step # 32 is identified, and step # 33
Then, switching to an optical system suitable for the film carrier 3 is performed.

Then, in step # 34, the lamp unit 41 suitable for the film carrier 3 is displayed on the message display portion 82 of the color CRT 2, and this subroutine is finished.

If the state is 1 in step # 1, the process proceeds to step # 11, in which the message indicating that the shading correction data is being fetched is displayed on the message display section 82 of the color CRT 2 and the film is displayed in step # 12. It is determined whether there is a carrier 3.

If it is determined that the film carrier 3 has been mounted, a request for pulling out the film carrier 3 is displayed on the message display section 82 in step # 18, and step # 18
After executing the cancel processing of the data fetched so far in 19, the present salve routine is ended.

When it is determined in step # 12 that the film carrier 3 is not present, the process proceeds to step # 13, in which the switching control of the filter is performed so as to take in the negative data and the positive data when the power is turned on.

Next, in step # 14, it is judged whether or not the data acquisition is completed, and if not, step # 1
Returning to step 1, the control up to step # 13 is repeated, and when the data acquisition is completed, the display during the shading correction data acquisition is canceled in step # 15, and the analysis processing of the data acquired is performed in step # 16. The analysis result is stored in the memory, the step #state is set to 2, and this subroutine is finished.

When the state check in step # 1 is 2, the process proceeds to step # 21 and it is determined whether or not the film carrier 3 is present.

If there is no film carrier 3, the process proceeds to step # 26 and a message requesting the mounting of the film carrier 3 that matches the lamp unit 41 is displayed on the message display portion 82 of the color CRT 2 and this subroutine is finished.

When the film carrier 3 is present in step # 21, the process proceeds to step # 22 and the type of the film carrier 3 is identified.

Then, in step # 23, it is determined whether the type of the film carrier 3 and the type of the lamp unit 41 match.

If the type does not match, a request to mount the lamp unit 41 suitable for the film carrier 3 is displayed on the message display portion 82 of the color CRT 2 in step # 25, and this subroutine is finished.

If the types are the same, the process proceeds to step # 24 to create a signal for permitting the transition process such as image data fetching, and this subroutine is finished.

As described above, when the film carrier 3 and the lamp unit 41 are present and their types are different from each other, the film carrier 3 is prioritized. This corresponds to that the user's intention to use the film carrier 3 is prioritized.

Further, the switching control of the magnification of the optical system is executed at the discrimination timing of the type when only one of the lamp unit 41 and the film carrier 3 is provided. If both are present, the type of film carrier 3 is adopted and switching is executed.

Control such as image data fetching is possible only when both the lamp unit 41 and the film carrier 3 are mounted and their types match.

As a result, the image on the film 11 is properly read without excess or deficiency in the effective light emission length or the total light emission amount of the lamp unit 41, and the light amount is not wasted.

Although only the initial state is described in the above description, the same applies to the subsequent states.

When the power is turned on, the shading correction data is taken in with the lamp unit 41 and without the film carrier 3, and the correction data suitable for the type of the lamp unit 41 is taken. At this time, the positive film data and the negative film data are fetched, and the data to be used is switched when the negative / positive is specified in the subsequent processing.

However, the default is negative in the case of a film carrier for continuous 35 mm plates, which is 3
It is set to be positive in the case of a film carrier for a 5 mm plate mount film. This is determined based on the degree of use of the film, but is not limited to this.

The operating speed is determined according to the size of the lamp unit 41 or the film carrier 3 detected in step # 24. The scanning speed of the first mirror 12 in each size is as follows: 35 mm plate film, 19.187 mm / s 6 cm plate film, 50.731 mm / s, 4 × 5 in plate film, 83.815 mm / s s.

Although the present embodiment has described only the film image reading apparatus, a mechanism for changing the magnification of the optical system and an optical system for switching the projection magnification according to the size of the original document from which the image is read, and The control can be similarly applied to a copying machine or the like that records an image by projecting an image of a document on a photoconductor.

[0191]

According to the present invention, since the switching means performs the variable power operation for switching the number of mirrors used in the reflecting means in accordance with the original size detection signal from the detecting means, the image of the original is projected onto the light receiving surface by the projection lens. The projection magnification when projecting the image upward and reading the image can be automatically switched according to the size of the document, and it is convenient for use because the user does not have to perform any special operation. Read failures are avoided.

The reflecting means switches the number of used mirrors arranged between the projection lens and the light receiving surface to reflect the projection light, and changes the optical path length in the optical path without the scanning mirror, thereby changing the magnification. By increasing the optical path length from the projection lens to the light receiving surface with a small number of mirrors and a small space by forming a free optical path that is not affected by the reflecting means and the scanning mirror on the light receiving surface, and changing the number of mirrors used Of the image can be read without moving the light-receiving surface. Therefore, it is possible to read a wide variety of images with sufficient magnification, and the structure and control It has an advantage that it is simple and can be provided at low cost because the lead wire is not laid around due to the movement of the light receiving surface and the machine design is easy, and the device is downsized. It becomes suitable to small yet read the cover images sizes such Irumu.

The reflecting means includes a first mirror for scanning the original document, second and third mirrors for moving at a speed of V / 2 with respect to the scanning speed V of the first mirror, and the first to the first mirrors. And a fourth mirror for reflecting the light passing through the projection lens, and a sixth mirror for guiding the light from the fifth mirror to the light receiving surface. Three kinds of projection magnifications can be obtained by two kinds of positions of the lens and two kinds of positions of the fourth and sixth mirrors, which is particularly advantageous when there are many kinds of sizes, and the magnification change Therefore, there is also an advantage that the optical switching efficiency is improved and the control and operation are simplified.

The fourth and sixth mirrors are movable by 1
It is on one unit, and this unit moves to
When the light from the mirror of can be guided directly to the light receiving surface,
When the projection light is directly guided from the fourth mirror to the light receiving surface, the movement of the fourth mirror to the predetermined position and the withdrawal of the sixth mirror from the projection light path can be performed together, so that the optical switching control and The operation can be further simplified, and the structure and control can be further simplified.

Further, if the scanning speed of the first mirror is changed according to the document size, the scanning time, that is, the image reading time can be made constant even if there is a difference in the scanning length corresponding to the document size. It is possible to prevent variations from occurring.

Further, changing the scanning speed of the first mirror
If it is automatically performed by the detection signal from the detection means, it is possible to eliminate the need for manual operation, which is convenient for use, and the trouble due to erroneous operation is reduced.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a color image reading apparatus as seen from the front, showing an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of an apparatus main body viewed from above.

FIG. 3 is a perspective view showing a connection state between a first mirror and a drive wire of an illumination unit.

FIG. 4 is a perspective view showing a drive mechanism including drive wires for a first mirror and an illuminating section, and second and third mirrors.

5 is a perspective view showing a projection state in the case of the 35 mm plate film of the optical system of FIG.

6 is a 6 cm plate film and 4 × 5 of the optical system of FIG.
It is a perspective view which shows the projection state in the case of an in-plate film.

FIG. 7 is a side view showing a schematic configuration of a ramp unit.

FIG. 8 is a perspective view of a lamp unit.

FIG. 9 is a conceptual diagram showing an internal configuration of a lamp unit.

FIG. 10 is a diagram showing types of lamps.

FIG. 11 is a front view of the film carrier.

FIG. 12 is a front view of the type detection unit of the film carrier.

FIG. 13 is a front view showing a color CRT, an operation panel, and an internal panel.

FIG. 14 is a block diagram of a CPU and its peripheral devices.

FIG. 15 is a block diagram of a parallel I / O and a circuit connected thereto.

FIG. 16 is a flowchart of a relationship processing subroutine for a lamp unit and a film carrier.

FIG. 17 is a reference diagram showing a positional relationship according to various film sizes in an actual optical system.

[Explanation of symbols]

 1 Device Main Body 2 Color CRT 3 Film Carrier 113 Illuminator 12-14, 16-18 Mirror 15 Projection Lens 41 Lamp Unit 45 Halogen Lamp 50 Short Wire 61 Hole 112 Color CCD Sensor 161, 162, 164 Photo Sensor 200 CPU 632 Scanner Motor 634 Conjugate length correction motor 636 Lens motor 638 Mirror motor

Claims (4)

[Claims] 1. An image reading apparatus which forms a document image on a light receiving surface through a projection lens and has a scanning mirror for scanning the document image between the document and the projection lens, and detects the size of the document. Means, reflecting means for changing the optical path length by switching the number of mirrors arranged between the projection lens and the light receiving surface for reflecting the projection light, and the number of mirrors used for the reflecting means based on the detection signal of the detecting means. And an image reading device provided with a means for switching between. 2. The reflecting means comprises a first mirror for scanning an original, second and third mirrors for moving at a speed of V / 2 with respect to a scanning speed V of the first mirror, and these first mirrors. A third mirror, fourth and fifth mirrors that reflect light that has passed through the projection lens, and a sixth mirror that guides the light from the fifth mirror to the light receiving surface. The image reading apparatus according to claim 1, wherein each of the sixth and sixth mirrors is on one movable unit, and the light from the fourth mirror can be directly guided to the light receiving surface by the movement of this unit. 3. The image reading device according to claim 1, wherein the scanning speed of the first mirror is changed according to the size of the original. 4. The scanning speed of the first mirror is automatically changed by a detection signal from the detection means.
An image reader according to any one of 1.