JPH09107446A - Picture input device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the influence of trash and dust, so that maintenance to remove the trash and the dust is made unnecessary by detecting the output adjustment (shading correction) and the focus origin position of a reading means at the outside of a stage. SOLUTION: At the time of the shading correction, a carriage 15 and a rack carriage 16 move to a carriage return position, and they are turned into a state not to block an optical axis. The shading correction is executed by utilizing space at the rear end part of this carriage 15 and the rack carriage 16. At the time of detecting the focus origin position, the carriage 15 and the rack carriage 16 move slightly from the shading correction, and an edge detecting part installed at the rack carriage 16 is turned into the state to obstruct the optical axis. The edge detecting part is provided with two edge parts formed into a slope inclined by about 45 deg. toward a focusing direction. Origin detection is executed by using a part of this edge.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image input apparatus for reading an image original such as a photographic film by transillumination, and more particularly to output adjustment (shading correction) of image reading means.

[0002]

2. Description of the Related Art An image input device is roughly divided into an illuminating section as an illuminating means for guiding illuminating light onto a transparent original, a scanning section having a carriage as a holding means for holding and moving a transparent original, and an original. It is composed of a projection unit as a reading unit for forming an image of the transmitted light of the above on a line sensor (CCD). The light from the illuminating unit is condensed into a linear shape on the transparent original, and after passing through the original, an image is formed on the CCD, which is read as one line data. After the reading of one line is completed, the scanning unit moves by one line to change the position of the transparent original, and the reading is performed again. Scanning for one screen is performed by repeating such reading and movement a plurality of times.

As a conventional image input apparatus having the above-mentioned structure, as described in Japanese Patent Laid-Open No. 3-145881, a film insertion opening into which a film as a transparent original is inserted is formed on the surface. A configuration is known that includes a support, a conveying unit that conveys a film in a reciprocating manner from the film insertion opening to the back, and an optical reading unit that has at least a part having an optical axis orthogonal to the conveying direction of the conveying unit. is there.

In this conventional image input device, as shown in FIG. 5, a transmission window 36 is provided in the conveying means, and the read light is passed through the transmission window 36 to adjust the output of the reading means (shading correction). I am trying.

[0005]

By the way, in the conventional example in which the transmission window is provided in the shape of a slit, the transmission window is often blocked by the adhesion of dust or dirt. In this case, when an output adjustment (shading correction) is performed by the reading unit, if dust or dust is present on the optical axis, the light is diffusely reflected and an appropriate amount of light cannot reach the image reading unit. Therefore, if shading correction is performed in this state, there is a problem in that proper adjustment cannot be performed. Therefore, when dust or dust adheres to the transmission window, the casing must be disassembled and then the dust or dust adhered to the transmission window must be removed.

Further, in the image reading apparatus having the autofocus function, the focus origin position is detected when the power is turned on, but the detection unit is a position where dust or dirt is unlikely to adhere and the original is not blocked. There was a need. The present invention
In order to solve such a problem, the output adjustment (shading correction) of the reading unit and the detection of the focus origin position are performed outside the stage to eliminate the influence of dust and dirt, and to achieve good output adjustment and focus. The purpose is to obtain the origin position accuracy and achieve maintenance-free operation against dust and dirt.

[0007]

According to a first aspect of the present invention, a light irradiation optical system for irradiating a film original for reading an image with light and an image of the light transmitted through the film original are formed. Image reading means for reading an image of the film original, a film original moving means for linearly reciprocating while holding the film original, and a guide means for guiding the linear reciprocating movement by the film original moving means. In the apparatus, the original moving means has an opening portion having an edge portion that is used for adjusting the output by the image reading means, allows the light transmitted through the film original to pass therethrough, and determines the origin of the autofocus operation. It is characterized by having.

According to a second aspect of the present invention, in the image input apparatus according to the first aspect, the film original moving means is the film original moving means to the position where the film original is held. It is characterized in that it is provided with an inserting means for inserting a document. According to a third aspect of the invention, in the image input device according to the first aspect,
The opening is provided in a place other than a film original reading area for reading the film original in the film original moving unit.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing an embodiment of an image input device according to the present invention. FIG. 2 is a sectional view showing an embodiment of the image input device according to the present invention. In FIG. 1, the main body of the image input device includes an illumination optical unit as an illumination unit that guides illumination light onto a film original, and a scanning unit that moves a carriage as a holding unit that holds the film original to scan the film original. , A projection optical unit for reading the image of the film original by forming an image of light transmitted through the film original on the CCD.

As shown in FIG. 2, the housing in which the illumination optical unit, the scanning unit, and the photographing optical unit are housed.
It is composed of a FRP body 1, an aluminum upper cover 2 that covers the upper portion of the body 1, and a polycarbonate front panel 3 that covers the front surface of the body 1. A mechanical body 4 for accommodating an image reading system including a scanning section, an illumination optical section and a projection optical section and a main board 5 are screwed to the body 1. Further, the front side of the upper cover 2 is locked to the front panel 3, and the rear side is fixed to the body 1 with a screw (not shown). The upper cover 2 and the front panel 3 cover the image reading system.

In FIG. 2, the main board 5 and the mechanical body 4 are connected by four sets of harnesses 6, and the front panel 3 has an insertion opening 7 for inserting a film mount and an LED for displaying an operation state. A window (not shown) is provided.
A part of the outer periphery of the manual focus cam 27 projects from the front panel 3 so that the focusing operation can be performed from the front panel. The eject button 19 projects from the front panel 3 so that the film mount inserted in the insertion slot 7 can be ejected. Further, the surface of the body 1 on the opposite side (back side) from the front panel 3 has a large opening, and can be connected to various connectors provided on the main board 5.

The scanning section is composed of a carriage section having a film mount holding and moving mechanism and a film focus adjusting mechanism, and a motor section having a power transmission mechanism for transmitting a motor driving force to the carriage section. The motor section is composed of a step motor 11 (FIG. 1) and a reduction gear 14a (integrated with the pinion gear 14) that reduces the rotation of the step motor 11, and is fixed to a motor mounting plate (not shown). . The motor mounting plate is screwed to the mechanical body 4.

The step motor 11 rotates the motor gear 13 press-fitted into the motor shaft, and rotates the pinion gear 14 via the reduction gear 14a. Here, the step motor 11 rotates 0.9 degrees per step corresponding to one line of the image. The carriage portion is composed of a carriage 15 and a rack carriage 16 that are integrally opposed to each other with a predetermined gap therebetween, one end of which is the mechanical body 4.
The other end of the guide block 17 is movable by being guided by a pair of parallel guide bars 17 fitted in the focus block 25. Further, two film pressing springs 18 are fixed to both ends of the facing surfaces of the carriage 15 and the rack carriage 16, and the film mounts inserted between the carriages 15 and 16 come into contact with each other.
By balancing the urging force of the film pressing spring 18, the film mount is always positioned in the center between the carriage 15 and the rack carriage 16 even if film mounts having different thicknesses are inserted between the carriages 15 and 16. . Carriage 15 and rack carriage 16
Since the center of is the optical focus position, if the emulsion surface of the film is located at the center of the mount even if the mount thickness is different, the focus adjustment can be omitted.

The rack carriage 16 is integrally formed with a beveled tooth rack 16a of, for example, a module 0.3 in parallel with the moving direction. The pinion gear 14 is fitted to the beveled tooth rack 16a, and the step motor 11 Driving force is transmitted, and thereby the carriage 15 and the rack carriage 16 are moved. Next, the film mount removing mechanism will be described.

As shown in FIG. 2, the front panel 3 has a film mount insertion opening 7 which is hollowed from the vertical direction to a position where the film mount can be picked up with a finger. The carriage portion of the film mount storage portion is always returned to the carriage return position III (FIG. 2) when the film is inserted and after the image data is read. As shown in FIG. 2, the shape of the film mount insertion opening 7 of the front panel 3 is such that at the carriage return position III, the front panel 3 is pierced deeper than the leading end position of the carriage portion to mount the film mount without an eject mechanism. You can take it out with your finger.

By making the gouging shape of the front panel 3 in conformity with the shape of the finger, the gouging shape can be made small and the internal space can be effectively used. In addition, as shown in FIG. 2, even if the insertion opening 7 cannot be gouged up and down due to the internal space, one of the top and bottom should be gouged to the back and the other should be gotten to the position where the film mount touches. You can easily remove the film mount with your fingers.

As shown in FIG. 2, the illumination optical section includes an illumination base 36, an LED block 37, and a toric mirror 3.
It is composed of an 8 and 40 degree mirror 29 and an illumination system lid 40. The entire illumination optical section is screwed to the mechanical body 4 with a screw. The LED block 37, which is a light source, is fixed on the illumination base 36 via an insulating sheet with an insulating collar and screws. The toric mirror 38 is rotatably attached to the illumination base 36 about a cylindrical protrusion provided on the side surface, and is fixed with a screw after adjusting the angle. The 40-degree mirror 29 is adhesively fixed to a bent portion formed on the illumination base 36. The illumination system lid 40 includes an LED block 37, a toric mirror 38,
And the 40-degree mirror 29 are fixed via two locking portions formed on the illumination base 36 so as to cover the mirror 29. Further, a slit for allowing the illumination light to pass toward the film mount is provided above the 40-degree mirror 29. It should be noted that the illumination system lid 40 blocks external light entering the interior of the illumination optical system.

As shown in FIG. 2, the projection optical section is composed of a 45-degree reflection mirror 41, a projection lens 42, a CCD 43, and a projection system lid 44, and the mechanical center body 4 is divided into three parts by a wall at the bottom center. It is located in the designated area. 4
The 5 degree reflection mirror 41 is fixed to the mechanical body 4 by adhesion. The projection lens 42 is composed of 6 lenses in 4 groups and is symmetrical, and is fixed to the lens chamber by a separation ring and a pressing ring, and the lens chamber is fixed to the mechanical body 4 by a set screw. The CCD board 45 on which the CCD 43 is mounted is
It is screwed to the mechanical body 4 via the CCD holder 46. Further, a projection system lid 44 is screwed to the outer periphery of the part partitioned by the wall.

The light passing through the film original has its optical path converted by 90 degrees by the 45-degree reflection mirror 41, and thereafter is imaged on the CCD 43 by the projection lens 42. Also, C
The CD holder 46 also functions as a light shield and a dust proof. Further, the projection system lid 44 also plays a role of shielding light and dust from the entire projection optical section, and guide bar 17 of the scanning section.
Also serves as a presser foot.

Next, the shading correction will be described. As shown in FIG. 3, the carriage 15 and the rack carriage 16 move to the carriage return position during shading correction, and the optical axis is not blocked. FIG. 4 is an enlarged view of this state. The inner limit of the film mount is limited by hitting the eject plate 12. Further, when the eject plate 22 is not required, the carriage 15 or the rack carriage 16 may be fixedly fixed. That is, even when the film mount is completely inserted into the carriage 15 and the rack carriage 16, the film mount does not block the optical axis located outside the carriage 15 and the rack carriage 16.

Shading correction is performed at the carriage return position. Since the rear end portions of the carriage 15 and the rack carriage 16 do not have a slit-shaped transparent window, dust and dirt are unlikely to adhere, and even if they adhere, the optical axis is unlikely to be blocked. By performing the shading correction using the space 34 at the rear end of the carriage 15 and the rack carriage 16, the shading correction can be surely performed without being affected by dust or dust during the shading correction. . Also, when reading a color original, for example, red, green, and blue light are sequentially illuminated,
At this time, the space 34 can be used to measure the light amount level of each illumination light to match the color balance and the like.

Next, the detection of the focus origin position will be described. As shown in FIG. 5, the carriage 15 and the rack carriage 16 move slightly from the shading correction when the focus origin position is detected.
The edge detection unit 32 provided in 6 blocks the optical axis. FIG. 6 is an enlarged view of this state.

The edge detecting portion 32 has two edge portions each having a slope of about 45 degrees in the focusing direction, and is attached to the carriage by integral molding. Origin detection is performed using the edge portion. The height of the edge portion in the focusing direction is located at the center of the carriages 15 and 16.
The principle of origin detection will be described below.

First, the carriage portion is moved to a position where the edge portion of the edge detecting portion 32 can be almost read by the CCD 43. Next, the AF motor 31 is rotated to move the carriages 15 and 16 up and down in the focus direction to capture one line data. The edge image obtained by this operation is as shown in FIG. Two edge intervals are calculated from this edge image.
As a calculation method, for example, a position where the output data exceeds a predetermined threshold value may be detected. When the step motor is moved and the focus cam 27 is rotated once, the edge interval at each focus position changes as shown in FIG. 8 according to the focus position. This is because the imaging magnification changes according to the focus position. The origin is detected by catching the change in the imaging magnification.

As described above, the shading correction is performed in the space at the rear end portion of the carriage 15 and the rack carriage 16, so that maintenance for removing dust and the like becomes unnecessary.

[0026]

As described above, according to the present invention, the reading light is passed through a portion where dust and dirt are unlikely to adhere,
Since the output adjustment of the reading means is performed, accurate shading correction that is unlikely to be affected by dust and dirt can be performed, and maintenance for removing dust and dirt is unnecessary.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of an image input device according to the present invention.

FIG. 2 is a side sectional view showing an embodiment of the image input device according to the present invention.

FIG. 3 is a top view showing an embodiment of the image input device according to the present invention.

FIG. 4 is a perspective view showing an embodiment of an image input device according to the present invention.

FIG. 5 is a perspective view showing an example of a conventional image input device.

6 is a diagram showing a cross section AA in FIG.

FIG. 7 shows an edge image of 1-line data read by a CCD.

FIG. 8 shows edge intervals at respective focus positions when the focus cam is rotated once.

[Explanation of symbols]

 1 Body 2 Top Cover 3 Front Panel 4 Mechanical Body 5 Main Board 6 Harness 7 Insertion Slot 11 Step Motor 13 Motor Gear 14 Pinion Gear 14a Reduction Gear 15 Carriage 15a Opening 16 Rack Carriage 16a Beveled Rack 17a Guide Bar 17b Guide Bar 18a Spring 18b Spring 19 Eject button 22 Eject plate 25 Focus block 27 Focus cam 29 40 degree mirror 31 AF motor 32 Edge detection section 34 Space 36 Lighting base 37 LED block 38 Toric mirror 39 40 degree mirror 40 Illumination system lid 41 45 degree reflection mirror 42 Projection lens 43 CCD 44 Projection system lid 45 CCD substrate 46 CCD holder

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display location H04N 5/16 H04N 1/10 5/253

Claims (3)

[Claims] 1. A light irradiation optical system for irradiating a film original for reading an image with light, and an image reading unit for forming an image of the light transmitted through the film original to read an image of the film original. An image input device comprising: a film original moving unit that linearly reciprocates while holding the film original; and a guide unit that guides the linear reciprocating movement of the film original moving unit, wherein the original moving unit is the image reading unit. The image input device, which is used to adjust the output, has an opening portion having an edge portion for allowing the light transmitted through the film original to pass therethrough and for determining the origin of the autofocus operation. 2. The image input device according to claim 1, wherein the film original moving unit inserts the film original to a position where the film original is held in the film original moving unit. An image input device comprising means. 3. The image input device according to claim 1, wherein the opening is provided in a place other than a film original reading area for reading the film original in the film original moving unit. Image input device.