JPH07319085A - Image forming device and method of exposure thereof - Google Patents

Abstract

PURPOSE:To scan a recording material at low cost through exposure to the proper amount of light. CONSTITUTION:Light dimmed by a dimming filter is transmitted through a light-reducing filter 54 prior to application to a document moved. The filter 54 includes areas 54A1, 54A2, 564A3,... with a fixed transmission and an area 54B with the same transmission as these areas. The light applied to the document has its transmitted region adjusted on the areas 54A1, 54A2, 54A3,... by moving the filter 54, so that the amount of light applied to the document corresponds to the requirement for exposure. If the amount of light corresponding to the exposure requirement is at its minimum, the filter 54 is moved so that the light passes through the area 54B. The light transmitted through the document in motion is slit through a slit and made to form an image on a recording material by an image-forming lens, and the recording material is scanned through exposure to the light.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus and an exposure method for the image forming apparatus, and more particularly to an image forming apparatus and an image forming apparatus for scanning and exposing an image of an original on a photosensitive material to form the image. The present invention relates to an exposure method for an apparatus.

[0002]

2. Description of the Related Art Conventionally, there has been known an image forming apparatus which records an image of an original on a recording material by slit exposure with a slit light. Such an image forming apparatus includes a light source such as a halogen lamp, a dimming filter for dimming the light from the light source according to the color of the image recorded on the document, and the light from the light source and the dimming filter. A lamp unit including a reflector that collects the light modulated by the light and irradiates the original is provided, the lamp unit and the film original are relatively moved, and the film original is formed by the light condensed by the reflector. Scan. Then, the light transmitted through the film original is made into slit light, and the slit transfer light scans and exposes the intermediate transfer medium or the recording material to record an image.

[0003]

However, when the film original is scanned and the slit light transmitted through the film original is scanned and exposed on the intermediate transfer medium or the like, the original illuminates a large amount of light and is recorded on the original. In some cases, the amount of exposure may be larger than the appropriate amount of exposure of the recording material for the image. Therefore, the intermediate transfer medium or the like cannot be scanned and exposed with an appropriate exposure amount, and an appropriate image may not be obtained.

In view of such a fact, for example, two light shield plates are provided between the light control filter and the original, and the light shield plates are moved forward and backward with respect to the optical axis to illuminate the recording material. The recording material is exposed by narrowing the irradiation range of the slit light. In this case, if the light blocking plate is inserted into the optical axis, the irradiation range of the slit light is narrowed over the longitudinal direction of the irradiation range of the slit light, so that the recording material is illuminated with respect to the unit movement amount of the light blocking plate. The rate of change in which the irradiation range of the slit light is reduced is large. Therefore, in order to expose the recording material with an appropriate amount of light, it is necessary to precisely control the movement of the light shielding plate. However, even if the light shielding plate is moved by a pulse motor or the like,
It is not possible to move the light shield plate precisely enough to expose the recording material with an appropriate amount of light. Therefore, the recording material cannot be exposed with an appropriate amount of light, and an appropriate recorded image cannot be obtained.

On the other hand, instead of the above-mentioned light-shielding plate, a predetermined dielectric or metal (chrome, silver, aluminum, etc.) is vapor-deposited on a glass flat plate so that the amount of transmitted light is continuously reduced from one end to the other end. It is conceivable that a filter is provided, the filter is moved forward and backward with respect to the optical axis, and the recording material is exposed with an appropriate amount of light, but such a filter has a high manufacturing cost and is not realistic. .

The present invention has been made in consideration of the above facts, and provides an image forming apparatus capable of scanning and exposing a recording material at a low cost with an appropriate light amount, and an exposure method for the image forming apparatus. With the goal.

[0007]

To achieve the above object, the invention according to claim 1 adjusts the light source for illuminating a document and the light from the light source according to the color of the image recorded on the document. A dimming filter for illuminating, an irradiating means for condensing and irradiating an original with at least one of the light from the light source and the light dimmed by the dimming filter;
A moving unit that relatively moves the light control filter and the irradiation unit and the document, and a light that is provided between the irradiation unit and the document and is movable in the relative movement direction and that illuminates the document. And a filter provided with a dimming region having a constant transmittance, the area of which gradually increases in the relative movement direction, and a filter moving means for moving the filter so that the light amount of the light irradiated on the document becomes a target light amount. An image forming lens for forming an image of light transmitted through the original on a recording material, and a slit extending in a direction intersecting the relative movement direction in which the light formed by the image forming lens on the recording material is slit light. , Is included.

According to a second aspect of the present invention, a light source for illuminating a document, a dimming filter including a plurality of movable filters for dimming light from the light source, and a dimming filter for dimming the light are provided. An irradiation unit that collects the emitted light from the light source and irradiates the document, a light source, the dimming filter, and a moving unit that relatively moves the irradiation unit and the document, the irradiation unit and the document. A dimming filter having a constant dimming region which is provided between the two, is movable in the relative movement direction, diminishes the light irradiated on the document, and has a constant transmittance, the area of which gradually increases in the relative movement direction. An image forming lens for forming an image of the light transmitted through the document on the recording material, and a light extending on the recording material by the image forming lens as a slit light and extending in a direction intersecting the relative movement direction. A slit that, the light quantity of the slit light includes a filter moving means for moving the light control filter and the neutral density filter so that the target light amount corresponding to the color of the image recorded on the document.

According to a third aspect of the invention, in the second aspect of the invention, the filter moving means reduces the light from the light source by the light control filter according to the color of the image recorded on the original. Moving the dimming filter and the dimming filter such that all or part of the dimming amount dimmed by all of the plurality of filters is dimmed by the dimming filter. I have to.

According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the transmittance of a light reducing plate having a constant transmittance for reducing the light radiated on the document is constant. The area of the dimming region of the dimming filter is gradually increased in the relative movement direction by providing a large number of regions having a transmittance higher than that of the dimming plate.

According to a fifth aspect of the invention, in the invention according to any one of the first to third aspects, the width in the direction intersecting the relative movement direction increases from the distal end toward the proximal end, and The maximum number of widths is shorter than the diameter of the circle of confusion on the surface of the dimming filter formed by the imaging lens, and a large number of sharp portions having a constant transmittance for dimming the light irradiated on the original are arranged in the relative movement direction. By doing so, the dimming region of the dimming filter is constituted.

According to a sixth aspect of the present invention, in the invention according to any one of the first to third aspects, the slit light imaged on the recording material at each position in the direction intersecting with the relative movement direction. The light-reducing filter light-reducing area is determined such that each of the sums of the amounts of light applied to the document corresponding to the above-mentioned lines on the document extending in the relative movement direction falls within a predetermined range.

According to a seventh aspect of the invention, in the invention according to any one of the first to third aspects, the width in the direction intersecting the relative movement direction increases from the distal end toward the proximal end, and The maximum number of widths is shorter than the diameter of the circle of confusion on the surface of the dimming filter formed by the imaging lens, and a large number of sharp portions having a constant transmittance for dimming the light irradiated on the original are arranged in the relative movement direction. In addition, a sharp portion in which a large number of rectangular portions having the same transmittance as that of the sharp portion for dimming the light radiated to the original in a region corresponding to the region where the slit light is focused on the recording material are dimmed are arranged. By continuously providing the light reduction area, the light reduction area of the light reduction filter is formed.

According to an eighth aspect of the present invention, a light source for illuminating a document, a dimming filter including a plurality of movable filters for dimming the light from the light source, and a dimming filter for adjusting the light are provided. An irradiation unit that collects the emitted light from the light source and irradiates the document, a light source, the dimming filter, and a moving unit that relatively moves the irradiation unit and the document, the irradiation unit and the document. A dimming filter having a constant dimming region which is provided between the two, is movable in the relative movement direction, diminishes the light irradiated on the document, and has a constant transmittance, the area of which gradually increases in the relative movement direction. An image forming lens for forming an image of the light transmitted through the document on the recording material, and a light extending on the recording material by the image forming lens as a slit light and extending in a direction intersecting the relative movement direction. A slit exposure method for an image forming apparatus comprising: a slit, the slit light quantity of the light imaged on the recording material is a target light quantity corresponding to a color of an image recorded on a document. The dimming filter and the dimming filter are moved.

According to a ninth aspect of the present invention, in the eighth aspect of the present invention, the dimming filter reduces the light amount from the light source in accordance with the color of the image recorded on the document. The dimming filter and the dimming filter are moved so that all or part of the dimming amount dimmed by all of the plurality of filters is dimmed by the dimming filter.

[0016]

According to the first aspect of the invention, all or part of the light from the light source for illuminating the original passes through the dimming filter. The light transmitted through the light control filter is controlled according to the color of the image recorded on the document. The moving unit relatively moves the light source, the light control filter, the irradiation unit, and the document. In addition, in the mode in which the light source, the light control filter and the irradiation means and the document are relatively moved, the first mode in which the document is moved with respect to the light source, the light control filter and the irradiation means, the light source, the light control filter and the irradiation means. There is a second mode in which the document is moved and a third mode in which both the light source, the light control filter, the irradiation unit and the document are moved.

In any one of the first to third aspects, in a state where the light source, the light control filter and the irradiation means and the document are relatively moved, the irradiation means controls the light from the light source and the adjustment means. At least one of the lights adjusted by the optical filter, that is, the light from the light source adjusted by the light control filter is condensed and applied to the document. The light collected by the irradiation unit passes through a dimming filter provided between the irradiation unit and the document before being irradiated on the document.

The dimming filter is provided with a dimming region that is movable in the relative movement direction, diminishes the light irradiated on the document, and has a constant transmittance that gradually increases in area in the relative movement direction. There is.

The light-reducing filter moving means moves the light-reducing filter so that the amount of light that passes through the light-reducing filter and is applied to the document becomes a target light amount. Then, the light transmitted through the original passes through a slit extending in a direction intersecting with the relative movement direction to become slit light, and this slit light is imaged on a recording material by an imaging lens. As described above, since the moving means relatively moves the light source, the light control filter, the irradiating means and the document, the recording material is scanned and exposed by the slit light. As a result, an image corresponding to the original is recorded on the recording material.

As described above, since the dimming area provided in the dimming filter is gradually increased in the relative movement direction, the change rate of the dimming amount of the light illuminating the document with respect to the unit moving amount of the dimming filter is changed. It is possible to make it small, and it is possible to finely control the dimming amount of the light illuminating the document.
This makes it possible to irradiate the original with an appropriate amount of light, expose the recording material with an appropriate amount of light that has passed through the original, and obtain an appropriate image.

Further, since the dimming region provided in the dimming filter has a constant transmittance, a predetermined dielectric or metal is vapor-deposited so that the transmittance gradually increases in the relative movement direction. Compared with a filter, it can be manufactured at a lower cost, and as a result, an image forming apparatus can be manufactured at a lower cost.

According to the second aspect of the invention, the light from the light source is dimmed by the dimming filter including a plurality of movable filters. That is, the light from the light source is dimmed according to the amount of movement by the dimming filter moved by the filter moving means described later. The irradiation unit condenses the light from the light source, which is adjusted by the light control filter, and irradiates the original with the light.

Here, the moving means relatively moves the light source, the light control filter, the irradiation means and the document. In addition, there are the above-described first to third modes in the mode in which the light source, the light control filter, the irradiation unit, and the document are relatively moved.

The light collected by the irradiating means is transmitted through a dimming filter which is provided between the irradiating means and the original and is moved by a filter moving means which will be described later, before the original is irradiated.

The dimming filter is provided with a dimming region which is movable in the relative movement direction, diminishes the light irradiated on the original, and has a constant transmittance in which the area gradually increases in the relative movement direction. .

The light transmitted through the dimming filter is transmitted through the document. The imaging lens allows the light transmitted through the document to be imaged on the recording material. The light imaged on the recording material by the imaging lens is made into slit light by the slit extending in the direction intersecting the relative movement direction.

Here, the filter moving means moves the dimming filter and the dimming filter so that the light amount of the slit light becomes the target light amount according to the color of the image recorded on the original.

According to the third aspect of the present invention, the filter moving means includes a plurality of dimming filters for dimming the light from the light source according to the color of the image recorded on the document. The dimming filter and the dimming filter are moved so that all or part of the dimming amount dimmed by all the filters is dimmed by the dimming filter.

As described above, since the light source, the dimming filter, the irradiation means and the original are relatively moved by the moving means, the recording material is scanned and exposed by the slit light. As a result, an image corresponding to the original is recorded on the recording material.

As described above, since the dimming filter and the dimming filter are moved so that the light amount of the slit light becomes the target light amount corresponding to the color of the image recorded on the original, the amount of movement of the dimming filter is set. The amount can be reduced, and the recording material can be scanned and exposed with an appropriate amount of light.

The actions and effects of the invention described in claims 8 and 9 are similar to the actions and effects of the invention described in claims 2 and 3, respectively. The description of the effect is omitted.

In order to increase the area of the dimming region of the dimming filter in the relative movement direction, the invention described in claim 4 provides a dimming plate for dimming the light applied to the original. , A large number of regions having a transmittance higher than that of the dimming plate are provided. That is, the light-reducing plate is provided with a number of regions having a transmittance higher than that of the light-reducing plate, for example, a plurality of circular regions whose diameters gradually increase or decrease in the relative movement direction. Alternatively, a large number of circular regions whose diameters do not change are provided so that the density becomes high or low in the relative equal directions.

Here, the dimming region of the dimming filter may be constructed as follows. That is, in the invention of claim 5, the width in the direction intersecting the relative movement direction increases from the front end to the base end, and the maximum length of the width is the confusion on the dimming filter surface by the imaging lens. A large number of sharp portions having a constant transmittance which is shorter than the diameter of the circle and diminishes the light irradiated on the original are arranged in the relative movement direction.

As described above, the maximum length of the width extending in the direction intersecting the relative movement direction from the tip end to the base end is shorter than the diameter of the circle of confusion on the dimming filter surface formed by the imaging lens. Therefore, the light transmitted through the area other than the sharp portion is diffracted at the boundary of the sharp portion area, and the shade portion of the sharp portion of the dimming filter is illuminated, and the shade becomes uneven illumination. Can be prevented from appearing on the recording material.

Further, in the invention according to claim 6, the relative movement of the light quantity of the light irradiated to the original corresponding to the slit light imaged on the recording material at each position in the direction intersecting the relative movement direction. The dimming filter dimming area is determined so that each of the sums on the lines extending in the direction falls within a predetermined range.

As described above, in the invention according to the sixth aspect, the light amount of the light radiated to the original corresponding to the slit light imaged on the recording material at each position in the direction intersecting the relative movement direction is described. Since each of the sums of the lines on the original extending in the relative movement direction is set within a predetermined range, the difference in the amount of light emitted between the respective positions on the original in the direction intersecting the relative movement direction is within an allowable range. The unevenness of illumination on the original can be suppressed within an allowable range, and an appropriate image can be obtained.

Further, in the invention according to claim 7, the width in the direction intersecting the relative movement direction is widened from the front end to the base end, and the maximum length of the width is the dimming filter surface formed by the imaging lens. A large number of sharp portions with a constant transmittance, which is smaller than the diameter of the circle of confusion and which diminishes the light emitted to the original, are arranged in the relative movement direction, and corresponds to the area where the slit light forms an image on the recording material. A rectangular portion having the same transmittance as that of the sharpened portion that diminishes the light radiated to the original in a region equal to or larger than the region to be formed is continuously provided to the sharpened portion in which the large numbers are arranged.

As described above, according to the seventh aspect of the invention, when the light quantity of the light irradiating the original document is set to the minimum light quantity, the light irradiating the original document is continuously provided on the sharp portions arranged in a large number. If the slit light is transmitted through a rectangular portion having the same transmittance as that of the sharpened portion that diminishes the light irradiated to the original in the area corresponding to the area where the slit light is focused on the recording material or more, the slit light is transmitted. It is possible to secure a wide range of exposure of the recording material, and even if dust or the like adheres to the dimming filter, the light from the region other than the region on the dimming filter where the dust adheres is diffracted, and the recording is performed. Since the shadow of dust on the material is irradiated, the shadow of dust becomes uneven illumination and can be prevented from appearing on the recording material.

[0039]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 shows an image recording apparatus 10 as an image forming apparatus according to the present invention. Image recording device 1
The machine base 12 of No. 0 is configured in a box shape as a whole, and a mounting table 12 for mounting a paper document 13 on the upper surface of the machine base 12.
A is provided. The holding table 12B is attached to the mounting table 12A so as to be openable and closable with the side on the back side of the apparatus as an axis. A transparent glass plate 12C (see FIG. 2) is attached to the mounting table 12A.
The paper document 13 is placed on the top. The paper original 13 placed on the transparent glass plate 12C is held at a predetermined position by closing the pressing cover 12B.

Inside the machine base 12 of the image recording apparatus 10, there is arranged a photosensitive material magazine 14 for storing the photosensitive material 16 wound into a roll. The photosensitive material magazine 14 exposes (exposes) the photosensitive material 16 extracted from the photosensitive material magazine 14.
The surface is set so that it faces the bottom of the device. A nip roller 18 and a cutter 20 are arranged near the photosensitive material take-out port of the photosensitive material magazine 14. Photosensitive material 16
After being pulled out from the photosensitive material magazine 14 by a predetermined length, it is cut by the cutter 20. A plurality of transport rollers 19, 21, 23, 24, 26 are sequentially arranged on the side of the cutter 20, and a guide plate 27 is disposed between the transport rollers. The photosensitive material 16 cut into a predetermined length is
The carrying rollers 19, 21, 23, 24, 26 and the guide plate 27 carry the sheet to the exposure unit 22 provided between the carrying rollers 23, 24.

A first scanning device 38 is provided in the space above the exposure section 22 and below the transparent glass plate 12C. The first scanning device 38 guides the light emitted from the halogen lamp 38A and the mirror unit 38B, the lens unit 38C, and the lens unit 38C that move below the transparent glass plate 12C along the transparent glass plate 12C to the exposure unit 22. The mirror unit 39 (mirrors 39A, 39B, 39C), a filter and a diaphragm (not shown) are provided. The driving circuit 38D (see FIG. 10) for moving the halogen lamp 38A and the mirror unit 38B of the first scanning device 38 is connected to the control device 250 and is operated in response to an instruction from the control device 250.

As shown in FIG. 2, in this embodiment, the mirror unit 39 is composed of three mirrors 39A, 39B and 39C, and the light emitted from the lens unit 38B in a substantially horizontal direction is substantially reflected by the mirror 39A. The exposure section 2 is reflected by being reflected at a right angle (downward direction), by being reflected by the mirror 39B substantially vertically (horizontal direction), and further by being reflected by the mirror 39C substantially vertically (downward direction).
Guide the light to 2. The mirror 39B is moved by a driver 39D connected to the control device 250 according to an instruction from the control device 250. That is, the mirror 3
9B is moved to the position shown by the solid line in FIG. 2 or the position shown by the imaginary line in FIG.

A second scanning device 34 is provided on the side of the first scanning device 38. Second scanning device 3
4 includes a light source unit 44 disposed above the machine base 12. Inside the casing 44A of the light source unit 44, a lamp 48 as a light source of the present invention and a reflector 46 as an irradiation means of the present invention are provided. On the light emitting side of the lamp 48, C (cyan), M (magenta),
A dimming filter section 50 including Y (yellow) filters and a driver for moving these filters is arranged. In this embodiment, as will be described later, since a negative film is used, a dimming filter section 50 for dimming the light from the lamp 48 is provided. Each filter of the dimming filter section 50 is adapted to be moved from the reference position with respect to the optical axis of the lamp 48 in response to an instruction from the control device 250. Reflector 4
6 collects at least one of the light from the lamp 48 and the light transmitted through the dimming filter section 50.

The spectral characteristics of each filter of the dimming filter section 50 will be described with reference to FIG. As shown in FIG. 9A, the spectral characteristic of the C (cyan) filter is approximately 400 in the transmission wavelength region where the transmittance is 90% or more.
The transmission wavelength of about 570 [nm] and the transmittance of 50 [%] is about 5
The wavelength range of 80 [nm] and the transmittance of 1 [%] or less is about 62.
It is 0 to 770 [nm].

The spectral characteristics of the M (magenta) filter are as follows:
As shown in FIG. 9B, the transmission wavelength region having a transmittance of 90% or more is approximately 400 to 490 [nm] and approximately 600 to
A transmission wavelength of 770 [nm] and a transmittance of 50 [%] is about 50.
The wavelength range of 0 and 590 [nm] and the transmittance of 1% or less is approximately 510 to 580 [nm].

The spectral characteristics of the Y (yellow) filter are as follows:
As shown in FIG. 9C, the transmission wavelength region where the transmittance is 90% or more is approximately 530 to 770 nm, and the transmittance is 50.
The transmission wavelength of [%] is approximately 520 [nm], and the transmittance is 1 [%].
The following wavelength region is approximately 400 to 490 [nm].

A dimming filter 54 as the dimming filter of the present invention is disposed below the dimming filter section 50 and between the film original 59 (see also FIG. 3). The dimming filter 54 is mounted on the driver 5 from the reference position.
4A (see FIG. 10) moves with respect to the optical axis. The driver 54A is connected to the control device 250, and moves the dimming filter 54 forward and backward in the direction of arrow A in FIG. 2 in response to an instruction from the control device 250.

A scan table 58 is provided below the light source unit 44. A film original 59 such as a negative film or a reversal film is set on the scan table 58. With the movement of the scan table 58 in the direction of arrow A in FIG. 2 (corresponding to the relative movement direction of the present invention) by the drive circuit 58A connected to the control device 250, the film original 59 set on the scan table 58 is moved. The irradiation site of the light condensed by the reflector 46 moves.

A slit 57 as a slit of the present invention is provided below the scan table 58, and the light transmitted through the film original 59 is incident on the film photometric unit 60 as slit light by the slit 57.

The film photometric unit 60 has a mirror 64. The mirror 64 is moved according to an instruction from the control device 250 by a driver 64A connected to the control device 250. That is, the mirror 64 is on the optical path of the slit light that has passed through the site where the scan table 58 is provided (see FIG.
To a position indicated by a solid line, a photometric position), or a position retracted from the optical path (a position indicated by a broken line in FIG. 2, referred to as a retracted position).

Further, the mirror 64 moved on the optical path.
A lens 68 and a line sensor 70 are sequentially arranged on the slit light emitting side. The lens 68 is configured to form an image of the incident slit light on the light receiving surface of the line sensor 70. The line sensor 70 includes a large number of light receiving elements arranged in three rows. Each row of light receiving elements is provided with a filter that transmits only light of R, G, and B wavelengths, and each light receiving element row transmits an area corresponding to one pixel row of the image of the film original. The light amounts of the R, G, and B component color lights are measured. The line sensor 70 is connected to the control device 250, and the measurement result is sent to the control device 25.
Output to 0.

Below the mirror 64, a zoom lens 72 as an image forming lens of the present invention is arranged. A mirror 74 that reflects the light emitted from the zoom lens 72 to the mirror 39B side is arranged on the light emission side of the zoom lens 72. The light reflected by the mirror 74 is reflected by the mirror 39.
When B is moved to the position shown by the imaginary line in FIG. 2, it is incident on the mirror 39C and is reflected by the mirror 39C to the exposure unit 22. The magnification of the zoom lens 72 is changed, and the incident slit light is imaged at the exposure position of the exposure unit 22. The image of the film original 59 is enlarged and exposed on the photosensitive material 16 by the zoom lens 72.

On the other hand, a switchback section 40 is provided beside the exposure section 22, and a water coating section 62 is provided below the exposure section 22. The photosensitive material 16 which has been raised to the side of the photosensitive material magazine 14 and whose image has been exposed in the exposure section 22 is once fed to the switchback section 40 and then moved downward to the exposure section 22 by the reverse rotation of the transport roller 26. It is sent to the water application unit 62 through the provided transport path. A plurality of pipes are connected to the water application unit 62, and water is supplied through the pipes. A heat development transfer section 104 is disposed on the side of the water application section 62, and the photosensitive material 16 applied with water is sent to the heat development transfer section 104.

The machine base 12 on the side of the photosensitive material magazine 14
Inside, a receiving material magazine 106 for storing the image receiving material 108 wound in a roll shape is arranged. Image receiving material 10
The image forming surface of No. 8 is coated with a dye fixing material having a mordant.
The image forming surface of the image receiving material 108 pulled out from the sheet 6 is set to face the upper side of the apparatus. Receiving magazine 1
A nip roller 110 and a cutter 112 are sequentially arranged in the vicinity of the take-out port of the image receiving material 108 of No. 06. The image receiving material 108 is pulled out from the receiving material magazine 106 by a predetermined length and then cut by the cutter 112. Cutter 11
An image receiving material transport unit 180 including transport rollers 186, 190, 114 and a guide plate 182 is provided on the side of the sheet 2. The image receiving material 108 cut into a predetermined length is conveyed by each conveying roller of the image receiving material conveying section 180 and the guide plate 182.
Is conveyed to the heat development transfer section 104.

The photosensitive material 16 conveyed to the heat development transfer section 104 is sent between the bonding roller 120 and the heating drum 116. Further, the image receiving material 108 is sent between the bonding roller 120 and the heating drum 116 in a state where the photosensitive material 16 is advanced by a predetermined length in synchronization with the conveyance of the photosensitive material 16, so that the image receiving material 108 is superposed on the photosensitive material 16. It has become. Inside the heating drum 116, a pair of halogen lamps 132A and 132B are arranged.
The halogen lamps 132A and 132B heat the surface of the heating drum 116. Five winding rollers 134, 135, 13 are provided on the outer peripheral side of the heating drum 116.
6, 138, 140 are arranged, and the winding roller 1
An endless pressure welding belt 118 is wound around 34 to 140. The endless pressure contact belt 118 is provided around the winding roller 13.
The endless outer side between the winding roller 140 and the winding roller 140 is pressed against the outer circumference of the heating drum 116.

A bending guide roller 142 is provided below the heating drum 116 downstream of the endless pressure contact belt 118 in the material supply direction.
Are arranged. A peeling claw 154 is rotatably supported by a shaft below the heating drum 116 on the downstream side of the bending guide roller 142 in the material supply direction. Peeling claw 154
Removes only the photosensitive material 16 superposed with the image receiving material 108 by a predetermined length from the outer peripheral surface of the heating drum 116. The photosensitive material 16 peeled by the peeling claw 154 is wound around the bending guide roller 142, and is discharged by the discharge roller 160 to the waste photosensitive material storage box 17
Collected in 8.

In the vicinity of the heating drum 116 on the side of the bending guide roller 142, the peeling roller 174 and the peeling claw 1 are provided.
76 are arranged. Peeling roller 174 and peeling claw 1
76 peels off the image receiving material 108 which is not peeled off by the peeling claw 154 from the outer peripheral surface of the heating drum 116. Below the peeling roller 174 and the peeling claw 176, receiving material discharging rollers 172, 173, and 175 are sequentially arranged, and a receiving material guide 170 is arranged between the discharging rollers.
The image receiving material 108 peeled by the peeling roller 174 and the peeling claw 176 is guided and conveyed, and is discharged into the tray 177.

Next, referring to FIG. 3, the dimming filter 54
Will be explained. As shown in FIG. 3, the dimming filter 54 is
By depositing a predetermined dielectric on a transparent flat plate, for example, a glass flat plate, regions 54A1, 54A2, 564A3 as sharp portions having a constant transmittance, which is the dimming region of the present invention,
... and areas 54A1 and 54A which are the dimming areas of the present invention
Areas 54B as rectangular portions having the same transmittance as 2, 564A3, ... Are formed. The area 54A1, 5
4A2, 54A3, ... And the predetermined dielectric material deposited on the regions 54B, the regions 54A1, 54A2, 54A.
.. and the amount of light transmitted through the region 54B are set to, for example, 10% of a predetermined target amount of light (minimum amount of light), that is, the amount of light condensed by the reflector 46. Further, on one end side of the dimming filter 54, there is a predetermined region (width R0) where the above-mentioned dielectric is not deposited. It should be noted that the regions 54A1, 54A2, 5A5,
4A3, ... And the amount of transmitted light in the area 54B can be arbitrarily changed.

Areas 54A1, 54A2, 564A3, ...
··· indicates that the width in the direction perpendicular to the arrow A direction is linearly widened in a direction intersecting the arrow A direction from the tip end to the base end in the moving direction of the scan table 58 (arrow A direction). There is. The direction intersecting with the arrow A direction may be a direction perpendicular to the arrow A direction or a direction substantially perpendicular to the arrow A direction. In addition, the areas 54A1 and 54A
2, 564A3, ...
The height in the direction of the arrow A is an isosceles triangle with R1. Further, the areas 54A1, 54A2, 54A3, ...
The maximum width L1 is smaller than the diameter L0 of the circle of confusion C on the surface of the dimming filter 54 by the zoom lens 72.

The area 54B is the area 54A1,
54A2, 564A3, ... From the base end to the other end of the dimming filter 54 (length R2), a dimming region, which corresponds to a region where the slit light forms an image on the photosensitive material 16. It is a wider area.

Next, the control device 250 will be described. As shown in FIG. 10, the control device 250 is configured by a microcomputer, and includes a CPU 252, a ROM 254, an R
It has an AM 256 and an input / output port 258, which are
They are connected to each other by a bus 260.

A control routine to be described later is stored in the ROM 254, and in the RAM 256, the movement amount of the dimming filter 54 with respect to the transmission amount is used as a map (see FIG. 12), and the movement of each CMY filter with respect to the transmission amount is moved. The amount is stored as a map (see FIGS. 13 to 15). Instead of such a map, an arithmetic expression of the movement amount of the dimming filter 54 with respect to the transmission amount and an arithmetic expression of the movement amount of each CMY filter with respect to the transmission amount may be stored.

The halogen lamp 38 is connected to the input / output port 258 through the dimming filter 50 and the drive circuit 38D.
A and a mirror unit 38B are connected. The input / output port 258 is connected to the dimming filter 54 via the driver 54A and the scan table 58 via the drive circuit 58A. In addition, the input / output port 25
8, a mirror 64 via a driver 64A, a mirror 39B via a driver 39D, and a line sensor 7
0 is connected. The input / output port 258 has
Other components, such as the photosensitive material 16 and the image receiving material 108.
Although components and the like for transporting are also connected, these are omitted for convenience of description. Next, as an operation of this embodiment, a process of scanning and exposing the image of the paper document 13 on the photosensitive material 16 will be described. When the paper original 13 is placed on the transparent glass plate 12C, the mirror 39B is moved to the position shown by the solid line in FIG. 2, and the photosensitive material 16 is conveyed to the exposure section as described later in detail. Next, halogen lamp 38
A is turned on, and the halogen lamp 38A and the mirror unit 38B are moved along the transparent glass plate 12C.

As a result, the light emitted from the halogen lamp 38A and reflected by the paper original 13 is reflected by the mirror unit 38B, transmitted through the lens unit 38C, reflected by the mirror unit 39 and applied to the photosensitive material 16. It As a result, the image on the paper document 13 is scanned and exposed on the photosensitive material 16.

Next, the image on the film original 59 is transferred to the photosensitive material 1
The process of scanning and exposing 6 will be described. When a film original is set on the scan table 58 and an instruction to expose the image of the film original on the photosensitive material 16 is input, first, the lamp 48 is turned on and the mirror 64 is moved to the photometric position. Further, the scan table 58 is moved to the initial position. In addition, this initial position is the light source unit 4
This is the position where the light emitted from No. 4 is applied to the edge of the image of the film original 59. As a result, the film original 59
The light that has passed through the edge portion of the image becomes slit light by the slit 57, is reflected by the mirror 64, is transmitted through the lens 68, and is imaged on the light receiving surface of the line sensor 70. The light intensity of each of the R, G, and B component color lights that have passed through each of the pixels configuring the above is measured by the line sensor 70.

Next, the measurement data output from the line sensor 70 is captured, and the measurement data representing the light amount of each component color light captured from the line sensor 70 is collected for each component color of each pixel forming one pixel row. It is converted into density data representing the density of and stored. Then, it is determined whether or not the image reading is completed. When the reading of the image is not completed, the scan table 58 is moved by a predetermined amount corresponding to the interval of the pixel columns. Therefore, the above processing is repeated until the scanning of the image is completed.
(And the film original 59) is gradually moved in the direction of arrow A in FIG. 2, whereby the amount of light transmitted through the image of the film original 59 is measured by the line sensor 70 for each pixel and for each R, G, B. , The measurement data is sequentially converted into the density data and stored.

When the reading of the image is completed, the exposure condition is determined based on the stored density data of each pixel and each color of the film original 59. Various methods can be applied to determine the exposure condition. For example, as described in JP-A-61-137145, the characteristic information of the image of the film original 59 is determined based on the density data. To calculate the density and color correction amounts for the exposure conditions, display the image corrected by the correction amount on a display means such as a monitor, and display the density and color at a predetermined position on the display image designated by the designating means. It is possible to modify the correction amount so that becomes a predetermined value, and determine the exposure condition based on the corrected correction amount. This makes it possible to easily obtain appropriate exposure conditions without performing test exposure or the like.

When the exposure conditions are determined as described above, the image of the film original 59 is exposed on the photosensitive material 16. That is, the scan table 58 is moved to the initial position again, the nip roller 18 is actuated, and the photosensitive material 16 is pulled out from the photosensitive material magazine 14.
Is pulled out by a predetermined length, the cutter 20 is operated to cut the photosensitive material 16 into a predetermined length. Then, the cut photosensitive material 16 is conveyed to the exposure position of the exposure unit 22. Mirror 64
To the retracted position. Further, the mirror 39B is moved to the position shown by the imaginary line in FIG. As a result, the light that has passed through the film original 59 and becomes slit light by the slit 57 is guided to the exposure unit 22.

Next, the respective filters of the dimming filter section 50 are moved according to the determined exposure conditions, and
The dimming filter 54 is moved so that the photosensitive material 16 is exposed by passing through the film original 59 by the light amount corresponding to the exposure condition.

This process is performed by the flow chart shown in FIG.
It will be described with reference to FIG. In step 202, the exposure control
According to the algorithm, each CMY file according to the exposure condition
Transmission amount T_C, T_M, T_YTo calculate. For example, C
After passing through the filter, the film original 59 is irradiated and
Then, the photosensitive material 16 is exposed through the film original 59.
The exposure dose is E_CAnd similarly for each MY filter
The corresponding exposure amount is E_M, E_Y, Then
Transmission amount T of each CMY filter _C, T_M, T_YIs next
It is obtained from equations (1) to (3).

[0071]

[Equation 1] T _C = logE _C · 1000 (1)

[0072]

[Equation 2] T _M = logE _M · 1000 (2)

[0073]

(3) T _Y = logE _Y · 1000 (3) In step 204, the target transmission amount T of the dimming filter 54 is calculated.
Calculate ₀ . Target transmission amount T ₀ is permeability of T _C of each of the CMY filter, T _M, the minimum value T _{mi n} in T _Y 1
It is calculated by subtracting 00. In this way, the target transmission amount T ₀ of the extinction filter 54 is calculated by subtracting 100 from the minimum value T _min among the transmission amounts T _C , T _M , and T _Y of the CMY filters. However, the present invention is not limited to this, and the minimum value T _min of the transmission amounts T _C , T _M , and T _Y of each CMY filter is 10 _min.
It may be calculated by subtracting a number other than 0 (for example, 80, 50, 30 etc.), or the minimum value T among the transmission amounts T _C , T _M and T _Y of each filter of CMY.
_min may be determined as the target transmission amount T ₀ of the dimming filter 54.

At step 206, the target transmission amount T calculated by calculating the transmission amount of the slit light transmitted through the dimming filter 54.
_The amount of movement of the dimming filter 54 from the reference position to achieve ₀ is calculated from the map (see FIG. 12). When an arithmetic expression is stored instead of the map, the calculation is performed from the arithmetic expression.

In step 208, the target transmission amounts T _C0 , T _M0 and T _Y0 of the CMY _filters are calculated. That is,
The target transmission amount T _C0 of the C filter, the target transmission amount T _M0 of the M filter, and the target transmission amount T _Y0 of the Y filter are calculated from the following equations (4) to (6).

[0076]

[Equation 4] T _C0 = T _C −T ₀ (4)

[0077]

[ _Equation 5] T _M0 = T _M −T ₀ (5)

[0078]

## _EQU6 ## T _Y0 = T _Y −T ₀ (6) In step 210, the transmission amount of each CMY filter is
The amount of movement of each CMY filter from the reference position to obtain the target transmission amounts T _C0 , T _M0 , and T _Y0 is calculated from the map (see FIGS. 13 to 15). When an arithmetic expression is stored instead of the map, the calculation is performed from the arithmetic expression.

In step 212, the dimming filter is moved by the amount of movement calculated in step 206, and step 21
In step 4, the CMY filters are moved by the amount of movement calculated in step 210, and this control is ended.

For example, the transmission amount T _C of the C filter is 13
00, the transmission amount T _M of the M filter is 1410, and the transmission amount T _Y of the Y filter is 1520, the minimum value T _min among the transmission amounts T _C , T _M , and T _Y is 13
Since it is 00, the target transmission amount T ₀ of the dimming filter 54 is _0.
(= T _min -100) becomes 1200, the target transmission amount T _C0 of the C filter becomes 100, the target transmission amount T _M0 of the M filter becomes 210, and the target transmission amount T _Y0 of the Y filter becomes 320.

Then, the respective filters of the calculated movement amount CMY and the dimming filter 54 are moved so as to obtain the respective calculated transmission amounts.

When the minimum value T _min among the transmission amounts T _C , T _M , and T _Y of each CMY filter needs to be reduced to a value (1300) or more that can be reduced by the dimming filter 54. In the [region C (see FIG. 16)], the light is reduced to the maximum by the light-reducing filter 54, and the amount of light that cannot be reduced by the light-reducing filter 54 is reduced by each of the CMY filters.

Further, CMY is determined by the exposure control algorithm.
When the transmission amount of each filter is less than 100 [area A
(See FIG. 16)], dimming control may be performed only by each of the CMY filters without using the dimming filter 54.

Area B (transmission amount is 100 to 1300)
Range, see FIG. 16) is a dimming filter 54 and CM.
Use each Y filter.

Along with the movement processing of the dimming filter and the CMY filter, the scan table 58 and the photosensitive material 16 are moved in synchronization. As a result, the image on the film original 59 is sequentially exposed on the photosensitive material 16 for each pixel row under the exposure conditions determined above. When the image is exposed,
The photosensitive material 16 is conveyed from the exposure section 22, sent to the switchback section 40, and the lamp 48 is turned off.

As described above, the amount of transmission T of each CMY filter according to the exposure condition is calculated by the exposure control algorithm.
_{From C} , T _M , and T _Y , the target transmission amount T of the dimming filter 54
₀ is calculated, and the target transmission amount T ₀ of the dimming filter 54 and the transmission amounts T _C , T _M , and T _{Y of the} CMY filters are calculated.
From, the target transmission amount T _C0 of each CMY filter,
Since T _M0 and T _Y0 are calculated and the CMY filters and the dimming filters are moved so that the calculated transmission amounts are obtained, light adjustment and exposure according to the exposure conditions are possible.

Further, a value obtained by subtracting the target transmission amount T ₀ of the dimming filter 54 from the transmission amounts T _C , T _M , and T _Y of each CMY filter is determined as the target transmission amount of each CMY filter. CM to achieve the target transmission amount
Since each Y filter is moved, the movement amount of each CMY filter can be reduced.

Further, conventionally, even if the light is dimmed by all the CMY filters, as shown in FIG.
The constant region including the wavelength of 00 [nm] and the wavelength region are 600
Although a certain area including [nm] was not dimmed to a desired amount, in the present embodiment, since the light is dimmed by the dimming filter, as shown in FIG. 18, all wavelength regions are covered. A desired amount of light can be dimmed, and uneven exposure of the photosensitive material can be prevented.

The transfer formation of the image exposed on the photosensitive material 16 by the above-mentioned processing onto the image receiving material 108 is performed as follows. That is, the photosensitive material 16 once fed to the switchback unit 40 is fed to the water applying unit 62 by the reverse rotation of the conveying roller 26, water as an image forming solvent is applied thereto, and further excess water is applied by the squeeze roller 68. Are removed and sent to the heat development transfer unit 104. Further, in synchronization with the exposure of the photosensitive material 16 described above, the image receiving material 108 is pulled out from the receiving material magazine 106 by the nip roller 110, and when the image receiving material 108 is pulled out by a predetermined length, the cutter 112 operates. Thus, the image receiving material 108 is cut into a predetermined length. The cut image receiving material 108 is conveyed by the conveying rollers 190, 186, 114 while being guided by the guide plate 182, and is in a standby state immediately before the thermal development transfer section 104.

In the heat development transfer section 104, when it is detected that the photosensitive material 16 has been fed between the outer periphery of the heating drum 116 and the bonding roller 120 by the squeeze roller 68, the conveyance of the image receiving material 108 is restarted. The heating drum 116 is operated while being fed to the bonding roller 120. The laminating roller 120 and the water application unit 6
A guide plate 122 is disposed between the two squeeze rollers 68, and the photosensitive material 16 sent from the squeeze rollers 68 is reliably guided by the guide plate 122 to the laminating roller 120.

The photosensitive material 16 and the image receiving material 108 superposed by the laminating roller 120 remain in the superposed state, and the heating drum 116 and the endless pressure contact belt 11 are kept.
It is sandwiched between the heating drum 116 and the heating drum 116, and approximately 2/3 of the circumference (between the winding roller 134 and the winding roller 140).
Is transported over. As a result, the photosensitive material 16 and the image receiving material 108 are heated to release the movable dye, and at the same time, the dye is transferred to the dye fixing layer of the image receiving material 108 to obtain an image.

When the photosensitive material 16 and the image receiving material 108 reach the lower portion of the heating drum 116, the peeling claw 154 is moved by the cam 130, and the leading end portion of the photosensitive material 16 is conveyed ahead of the image receiving material 108 by a predetermined length. Peeling nail 154
Engage to separate the tip of the photosensitive material 16 from the outer periphery of the heating drum 116. Further, the pinch roller 157 presses the photosensitive material 16 by the returning movement of the peeling claw 154, and thus the photosensitive material 16 is wound around the bending guide roller 142 while being pressed by the pinch roller 157, and is moved downward to accommodate the discarded photosensitive material. Collected in box 178.

On the other hand, the heating drum 1 is separated from the photosensitive material 16.
The image receiving material 108 that moves while being in close contact with 16.
Is sent to the peeling roller 174 and peeled. Peeling nail 1
The image receiving material 108 peeled from the outer periphery of the heating drum 116 by 76 is moved downward while being wrapped around the peeling roller 174, and is conveyed by the material receiving discharge rollers 172, 173, and 175 while being guided by the material receiving guide 170. The sheet is discharged to the tray 177, and the processing ends.

Now, the relationship between the amount of movement of the dimming filter 54 and the amount of reduction of the transmitted light amount of the dimming filter 54 will be described.

As shown in FIG. 4, the dimming filter 54
Are moved in the same direction as the moving direction of the scan table 58 (direction of arrow A). Therefore, when the dimming filter 54 is moved by the distance K from the initial position of the dimming filter 54 shown in FIG. 4A (see FIG. 4B), the film original 59 corresponding to the slit light is irradiated. Light (hereinafter,
The irradiation range T of (corresponding slit light) relatively reaches the above-mentioned areas 54A1, 54A2, 54A3, ... And the corresponding slit light transmitted through the areas 54A1, 54A2, 54A3 ,. , 54A2, 5
It is dimmed by 4A3. The amount by which the corresponding slit light is reduced by the areas 54A1, 54A2, 54A3, ... Is the areas 54A1, 54A2, 54A3 ,.
・ Corresponds to the area of the corresponding slit light that passes through. Here, as shown in FIG. 5 in which the area 54A4 is enlarged, the area 5
The area S of the corresponding slit light passing through 4A4 is as follows. That is, the movement amount of the dimming filter 54 is x,
When the half angle of the isosceles triangle of the region 54A4 is θ and the width of the slit light is M, the area S is obtained from the following equation (7).

[0096]

[Equation 7] S = (2M · tan θ) · x + M ² · tan θ (7) Then, the regions 54A1, 54A2, 54A3, ... 5
The area S _n of the corresponding slit light that transmits the entire 4An (assuming that n regions that are sharp portions are provided) is obtained from the following equation (8).

[0097]

[Equation 8] S _n = (2n · M · tan θ) · x + n · M ² · tan θ (8) As can be understood from this equation (8), the area S _n is
Since n, M, and tan θ are constants, they are linear functions of the movement amount x of the extinction filter 54. Therefore, it is understood that the reduction amount of the corresponding slit light amount is a linear function of the movement amount x of the dimming filter 54.

On the other hand, in the method of reducing the irradiation range T of the corresponding slit light shown in FIG.
Assuming that the movement amount of the light shielding plate is x, the area S ′ where the slit light is shielded is that the distance in the longitudinal direction of the irradiation range T of the corresponding slit light is n · L1 (= n · 2R1 · tan θ). Considering that there are two light shields, the following formula (9)
Obtained from

[0099]

## EQU9 ## S '= (4n.R1.tan.theta.). X (9) As can be understood from the formula (9), the reduction amount of the corresponding slit light amount is also the movement of the light shielding plate in this case. It is understood that it is a linear function of the quantity x.

Comparing the above equations (8) and (9), the reduction amount of the corresponding slit light amount with respect to the movement amount x of the dimming filter 54 or the light shielding plate is reduced by two light shielding plates. From this, it is understood that the case of this embodiment is smaller (M <R1).

Here, in the method of moving the two light-shielding plates, the irradiation range T of the corresponding slit light is narrowed by the two light-shielding plates, so that the movement amount x of the light-shielding plate is equal to the irradiation range T of the corresponding slit light. The width is smaller than the width M, and the reduction amount of the corresponding slit light amount is large with respect to the movement amount x of the light shielding plate. Therefore, it is understood that it is difficult to obtain an appropriate exposure amount.

On the other hand, in this embodiment, instead of narrowing the irradiation range T of the corresponding slit light, the dimming filter 54 is used.
Therefore, the amount of movement of the dimming filter 54 is large, and the amount of reduction of the corresponding slit light amount is small relative to the amount of movement x of the dimming filter 54. Therefore, in this embodiment, it is possible to finely control the reduction amount of the corresponding slit light amount, whereby the photosensitive material can be exposed with an appropriate light amount and a proper image can be obtained.

Further, the areas 54A1, 54A2, 54A
Since the maximum width L1 of 3, ... Is shorter than the diameter L0 of the circle of confusion on the surface of the dimming filter 54 by the zoom lens 72, the regions 54A1, 54A2, 54A3 ,.
..Light transmitted through areas other than areas 54A1 and 54A
, 54A3, ... Diffracts at the boundary, and the corresponding areas 54A1, 5A of the dimming filter 54 by the corresponding slit light.
The shaded portions of 4A2, 54A3, ... Are illuminated, and the shades can be prevented from appearing on the photosensitive material 16 as uneven illumination.

Here, as shown in FIG. 6A, in the example of using the light shielding plate, when the film original 59 is irradiated with the minimum light amount and the photosensitive material 16 is exposed with the minimum exposure amount, two light shielding plates are used. The irradiation range T of the corresponding slit light is narrowed by 100A and 100B. Therefore, for example, when the dust 200 adheres to the irradiation range t of the narrowed corresponding slit light,
Since the irradiation range T of the corresponding slit light becomes narrow (irradiation range t), the shadow of the dust becomes uneven illumination 300 and is reflected on the photosensitive material 16. On the other hand, in the present embodiment, when the film original 59 is irradiated with the minimum amount of light, the dimming filter 54 is moved so that the corresponding slit light passes through the region 54B in which the predetermined dielectric is deposited. . Thereby, the light amount of the corresponding slit light is set to the minimum light amount, and the irradiation range T of the corresponding slit light is secured wide. Therefore, light from an area other than the area on the light-reducing filter 54 to which dust is attached diffracts and irradiates the shadow portion of the dust 200 on the photosensitive material 16, which causes uneven illumination. It is possible to prevent it from being reflected on the photosensitive material 16.

Further, as compared with the case where a filter is manufactured by depositing a predetermined dielectric material on the entire surface of the flat plate so that the amount of transmitted light continuously decreases from one end to the other end of the transparent flat plate instead of the light shielding plate. In this embodiment, the dimming filter 54 is
Since the predetermined dielectric is vapor-deposited in the regions 54A1, 54A2, 564A3, ... And the region 54B so that the transmittance is constant, the dimming filter 54 can be manufactured at low cost, and as a result, the image can be obtained. The forming apparatus can be manufactured at low cost.

The above-mentioned filter is constructed such that the sharp portion, which is a dimming region composed of isosceles triangles, extends in the forward / backward movement direction of the filter, but the invention is not limited to this. As shown in FIG. 7, sharp portions 54A1 and 54A, which are dimming regions formed of isosceles triangles.
2, 54A3, 54A4, ... May extend in a direction having a predetermined angle, for example, 30 ° to 45 ° from the forward / backward movement direction of the filter. In this way, the sharp portions 54A1, 54A2, 54A3, 54A4, ...
. Extends from the forward / backward movement direction of the filter in a direction having an angle of 30 ° to 45 °, the film document 59 extending in the forward / backward movement direction of the corresponding slit light quantity at each position in the direction perpendicular to the forward / backward movement direction. Each of the sums on the line above can be within a predetermined range. Thus, the difference in the amount of light emitted between the respective positions on the film document 59 in the direction intersecting the forward / backward movement direction can be set within the allowable range, and the uneven illumination on the film document 59 can be suppressed within the allowable range. Therefore, a proper image can be obtained.

Further, the pointed portion 54 of the filter described above is used.
A1, 54A2, 54A3, 54A4, ... (FIG. 3,
In FIG. 7), the two sides are straight lines, but the present invention is not limited to this. For example, as shown in FIGS. 8A and 8B, as a convex curve E or a concave curve F, Good. In addition, as shown in FIG. 8D, the width of the sharp portion may be gradually increased. In this case, the sharp portion having the convex curve E shown in FIG. 8A has a light intensity of the corresponding slit light with respect to the moving amount of the filter that is greater than the sharp portion having the concave curve F shown in FIG. 8B. The rate of decrease is large. Therefore, the concentration of the dielectric substance deposited on the sharp portion having the concave curve F may be made smaller than the concentration of the dielectric substance deposited on the sharp portion having the concave curve F.

As described above, in the examples shown in FIGS. 8A, 8B and 8D, since the dimming area provided for the filter is gradually increased in the advancing / retreating direction, the unit moving amount of the filter is increased. It is possible to reduce the rate of change of the light reduction amount of the light irradiating the film original 59 with respect to the film. As a result, the light reduction amount of the light irradiating the film original 59 can be finely controlled. Can be exposed to light and an appropriate image can be obtained, which is the same effect as in the above-described embodiment. In addition, if the maximum width L1 of the pointed portion is made shorter than the diameter L0 of the circle of confusion on the filter surface formed by the zoom lens, the shadow of the pointed portion caused by the light illuminating the film original 59 becomes uneven illumination and is reflected on the photosensitive material. You can avoid it. Furthermore, if the filter is moved so that the corresponding slit light is transmitted through the region D where a predetermined dielectric is vapor-deposited on the entire irradiation area of the corresponding slit light, even if the transmitted light amount is the minimum light amount,
It is possible to prevent dust from adhering to the irradiation area of the corresponding slit light on the filter, and the shadow of the dust causes uneven illumination and is not reflected on the photosensitive material. Also, the dimming filter 54
Since a predetermined dielectric is vapor-deposited so that the transmittance is constant, it can be manufactured at low cost.

8 (a), 8 (b) and 8
The sharp portion of (d) is configured to extend in the forward / backward movement direction of the filter, but is not limited to this. For example, as shown in FIG. 7, the forward / backward movement direction of the filter is changed. Predetermined angle, for example, 30 ° to 45
You may comprise so that it may extend in the direction which has (degree). As a result, the film original 59 in the direction intersecting the forward / backward movement direction is formed.
The difference in the amount of light emitted between the above positions can be within the allowable range, the uneven illumination on the film original 59 can be suppressed within the allowable range, and a proper image can be obtained.

Further, as shown in FIG. 8C, the dimming plate 5
In 4C, a dielectric is not deposited on a region where the amount of transmitted light is less than the amount of transmitted light of the dimming plate 54C, for example, a large number of circular regions d, and a predetermined dielectric is deposited on the other regions. Alternatively, the dimming region of the filter may be formed. In the example shown in FIG. 8C, the diameter of the circular shape is defined as the moving direction of the filter (see FIG.
Although the length is increased in the arrow direction B) in (c), the present invention is not limited to this, and the diameter of the circle may be decreased in the moving direction of the filter. In this case, the density of providing the circular areas in the moving direction of the filter may be increased. Further, the density of the circular areas may be increased in the moving direction of the filter without changing the diameter of the circular shape. Further, although the predetermined dielectric is not vapor-deposited on the circular area, the present invention is not limited to this, and the predetermined dielectric is vapor-deposited on the entire surface of the transparent flat plate to correspond to the circular area. A hole may be formed in the flat plate.

In various examples including the example shown in FIG. 8C described here, the same effect as the above-described embodiment, that is, the film original 59 with respect to the unit movement amount of the filter is obtained.
It is possible to reduce the rate of change in the extinction amount of the light irradiating the film, and to finely control the extinction amount of the light irradiating the film original 59.

As a result, the film original 59 can be irradiated with an appropriate amount of light, the photosensitive material can be exposed with an appropriate exposure amount, and an appropriate image can be obtained. Also, the maximum length L1 of the distance between the circular areas d
Is smaller than the diameter L0 of the circle of confusion on the filter surface formed by the zoom lens, it is possible to prevent the shadow of the dimmed region d caused by the corresponding slit light from becoming uneven illumination and not appearing on the photosensitive material. Further, when the transmitted light amount is set to the minimum light amount, the filter is set so that the corresponding slit light passes through the region where the predetermined dielectric is vapor-deposited over the entire region corresponding to the irradiation range of the corresponding slit light. By moving the dust, even if dust adheres to the irradiation area of the corresponding slit light on the filter, the shadow of the dust causes uneven illumination so that it is not reflected on the photosensitive material. Also,
The filter can be manufactured at low cost because it can be manufactured simply by vapor-depositing a predetermined dielectric at a similar concentration. Furthermore, by adjusting the formation position of the circular area d, the difference in the amount of light irradiated between the respective positions on the film original 59 in the direction intersecting the forward / backward movement direction can be kept within the allowable range, The uneven illumination on the original 59 can be suppressed within an allowable range, and an appropriate image can be obtained.

Further, in the various filters described above, the flat plate shape is formed by depositing a predetermined dielectric, but the present invention is not limited to this, and only the portion where the predetermined dielectric is deposited may be formed. Even in this case, the effects described above can be obtained. Also, an example in which a predetermined dielectric is vapor-deposited in a flat plate shape has been described, but the present invention is not limited to this, and a predetermined metal (chrome, silver, aluminum, etc.) may be vapor-deposited. Even in this case, the effects described above can be obtained.

The light-sensitive material that can be used in the above-mentioned embodiments is a diffusion transfer type heat-developable color light-sensitive material consisting of a light-sensitive element and an image-receiving element. Fuji Photo Film Co., Ltd.] filed on October 31, 1994 (reference number 874940)
28) in the embodiment of the photosensitive material No. It was produced by the method described in No. 101, and had blue, green and red spectral sensitivities. The wavelength showing the maximum value of the spectral sensitivity is
About 465 [nm], about 550 [nm], about 71, respectively
It was 0 [nm]. Further, in the gradation of the green photosensitive layer in 0.1 [S] exposure, the gamma at a density of about 1.0 was about 2.5. The image receiving paper is PICROSTAT 200/300 S manufactured by Fuji Photo Film Co., Ltd.
ERIPSPS PAPER PS-SG was used.

As the light-sensitive material which can be used in the various embodiments described above, a visible image can be obtained by subjecting a latent image obtained by imagewise exposure to a predetermined visualization process. Any material may be used, for example, a color photographic light-sensitive material such as a negative film, a reversal film, a color printing paper, a color diffusion transfer light-sensitive material, a color heat development light-sensitive material or a color light-sensitive pressure-sensitive material.
When a positive original is used, a so-called positive-positive type photosensitive material is used for each of the above-mentioned photosensitive materials, and when a positive original is recorded using a negative original, a so-called negative-poi type photosensitive material is used. .

[0116]

As described above, according to the inventions of claims 1 and 4, since the dimming area provided in the filter is gradually increased in the relative movement direction, the original document per unit movement amount of the filter is increased. It is possible to reduce the rate of change in the extinction amount of the light that illuminates, and to finely control the extinction amount of the light that illuminates the document, and to illuminate the document with an appropriate amount of light and transmit the document. The recording material can be exposed with an appropriate amount of light, and an appropriate image can be obtained, and since the dimming region provided in the filter has a constant transmittance, the transmittance in the relative movement direction is When compared with a filter configured by vapor deposition of a predetermined dielectric so that the value becomes gradually larger, the manufacturing cost thereof can be manufactured at low cost, and the image forming apparatus can be manufactured at low cost. With a cormorant effect.

According to the second, third, eighth and ninth aspects of the present invention, the light control filter and the light control filter are provided so that the light quantity of the slit light becomes a target light quantity corresponding to the color of the image recorded on the original. Since the dimming filter is moved, it is possible to reduce the amount of moving the dimming filter,
This has the effect that the recording material can be scanned and exposed with an appropriate amount of light.

According to the fifth aspect of the present invention, the maximum length of the width of the sharp portion extending from the tip to the base end in the direction intersecting the relative movement direction is defined by the circle of confusion on the filter surface by the imaging lens. Since the diameter is shorter than the diameter, the light transmitted through the area other than the sharp portion is diffracted at the boundary of the sharp portion area and illuminates the shadow portion of the sharp portion of the filter, and the shadow is illuminated. There is an effect that unevenness can be prevented from appearing on the recording material.

According to a sixth aspect of the present invention, in the relative movement direction of the light amount of the light irradiated to the original corresponding to the slit light imaged on the recording material at each position in the direction intersecting the relative movement direction, Since each of the sums of the lines on the extending original document falls within a predetermined range, the difference in the amount of light emitted between the respective positions on the original document in the direction intersecting the relative movement direction should be within the allowable range. Therefore, it is possible to suppress uneven illumination on the original document within an allowable range and obtain an appropriate image.

According to the seventh aspect of the present invention, when the light amount of the light irradiating the document is set to the minimum light amount, the light irradiating the document is transmitted through the rectangular portions continuously provided in the sharp portions in which the plurality are arranged. By doing so, it is possible to secure a wide range of exposing the recording material with the slit light, and even if dust or the like adheres to the filter, the light from the area other than the portion on the filter where the dust adheres is diffracted. Therefore, it is possible to irradiate the portion of the dust on the recording material, which prevents the dust from being reflected on the recording material as uneven illumination.
Has the effect.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of an image recording apparatus according to an embodiment.

FIG. 2 is a schematic configuration diagram of an optical system of the image recording apparatus.

FIG. 3 is a schematic view of a filter.

FIG. 4 shows the initial position of the filter and the distance K from the initial position.
It is the figure which showed the relationship between the said filter and the position of the irradiation range of a corresponding slit light when only it moved.

FIG. 5 is an enlarged view of one sharp portion of the filter through which the corresponding slit light is transmitted.

6A is an illumination unevenness reflected on a photosensitive material when dust adheres to a corresponding slit light irradiation range narrowed by two light shielding plates, and FIG. 6B is a corresponding slit light irradiation. FIG. 7 is a diagram showing a state in which the photosensitive material is exposed when dust adheres to the filter in a range.

FIG. 7 is a schematic view of a filter in which a sharp portion is obliquely extended.

FIG. 8 is a diagram showing an outline of various filters.

FIG. 9 is a diagram showing spectral characteristics of CMY filters.

FIG. 10 is a block diagram of a control device.

FIG. 11 is a flowchart of a movement control routine of the dimming filter and the dimming filter.

FIG. 12 is a diagram showing a map of a movement amount of a dimming filter with respect to a transmission amount stored in a RAM.

FIG. 13 is a diagram showing a map of the movement amount of the C filter with respect to the transmission amount stored in the RAM.

FIG. 14 is a diagram showing a map of the movement amount of the M filter with respect to the transmission amount stored in the RAM.

FIG. 15 is a diagram showing a map of a movement amount of a Y filter with respect to a transmission amount stored in a RAM.

FIG. 16 is a diagram showing a range of a transmission amount using only each CMY filter and a range of a transmission amount using only a dimming filter and each CMY filter.

FIG. 17 is a diagram showing the relationship between the wavelength and the transmittance when light is dimmed by all the CMY filters.

FIG. 18 is a diagram showing the relationship between the wavelength and the transmittance of all of the CMY filters and the light transmittance when light is reduced by the dark filter.

[Explanation of symbols]

 10 Image Recording Device 16 Photosensitive Material 22 Exposure Section 30 Control Device 34 Second Scanning Device 38 First Scanning Device 46 Reflector 48 Lamp 50 Light Control Filter 54 Filter 57 Slit 59 Film Document 70 Line Sensor 72 Zoom Lens

Claims (9)

[Claims] 1. A light source for illuminating an original, a dimming filter for dimming the light from the light source according to the color of an image recorded on the original, and the light from the light source and the dimming filter. An irradiation unit that collects and irradiates at least one of the lights adjusted by an optical filter onto a document, a moving unit that relatively moves the light source, the light adjustment filter, and the irradiation unit and the document, and the irradiation. A light-reducing region that is provided between the means and the document, is movable in the relative movement direction, diminishes the light illuminating the document, and gradually increases in area in the relative movement direction and has a constant transmittance. And a dimming filter, a dimming filter moving means for moving the dimming filter so that the amount of light applied to the document becomes a target amount of light, and an image of the light transmitted through the document is recorded on a recording material. An image forming apparatus comprising: an image forming lens; and a slit extending in a direction intersecting the relative movement direction in which light imaged on the recording material by the image forming lens is slit light. 2. A light source for illuminating a document, a dimming filter including a plurality of movable filters for dimming light from the light source, and the light source dimmed by the dimming filter. An irradiation unit that collects light from the source and irradiates the document, a moving unit that relatively moves the light source, the light control filter, and the irradiation unit and the document, and are provided between the irradiation unit and the document. And a dimming filter that is movable in the relative movement direction and that diminishes the light emitted to the document and that includes a dimming region with a constant transmittance that gradually increases in area in the relative movement direction, and the document. An imaging lens that forms an image of the transmitted light on a recording material, and a slit that extends in a direction intersecting the relative movement direction in which the light imaged on the recording material by the imaging lens is a slit light. An image forming apparatus including: a moving unit for moving the dimming filter and the dimming filter so that the amount of the slit light becomes a target amount of light corresponding to a color of an image recorded on a document. 3. The filter moving means controls all of the plurality of filters out of an amount of light reduced by the light control filter according to a color of an image recorded on the document. The image forming apparatus according to claim 2, wherein the dimming filter and the dimming filter are moved so that all or part of the dimming amount to be dimmed is dimmed by the dimming filter. 4. The dimming area of the dimming filter is provided by providing a dimming plate having a constant transmissivity for dimming light applied to an original with a large number of regions having a transmissivity higher than that of the dimming filter. The image forming apparatus according to claim 1, wherein the area is gradually increased in the relative movement direction. 5. A width in a direction intersecting the relative movement direction increases from a front end to a base end, and a maximum length of the width is shorter than a diameter of a circle of confusion on the dimming filter surface formed by the imaging lens. 4. The dimming region of the dimming filter is configured by arranging a large number of sharp portions having a constant transmittance for dimming the light emitted to the original in the relative movement direction. 2. The image forming apparatus according to item 1. 6. A line on a document extending in the relative movement direction of a light amount of the light irradiated to the document corresponding to the slit light imaged on the recording material at each position in a direction intersecting the relative movement direction. 4. The image forming apparatus according to claim 1, wherein the dimming filter dimming region is determined so that each of the sums falls within a predetermined range. 7. A width in a direction intersecting with the relative movement direction increases from a tip end to a base end, and a maximum length of the width is shorter than a diameter of a circle of confusion on the dimming filter surface formed by the imaging lens. In addition, a large number of sharp portions with a constant transmittance for dimming the light radiated to the original are arranged in the relative movement direction, and the original of the area larger than the area corresponding to the area where the slit light is imaged on the recording material is formed. The light-reducing region of the light-reducing filter is formed by continuously providing a rectangular portion having the same transmittance as the sharp portion for dimming the emitted light to the arranged sharp portions. Item 4. The image forming apparatus according to any one of items 3. 8. A light source for illuminating a document, a dimming filter including a plurality of movable filters for dimming light from the light source, and the light source dimmed by the dimming filter. An irradiation unit that collects light from the source and irradiates the document, a moving unit that relatively moves the light source, the light control filter, and the irradiation unit and the document, and are provided between the irradiation unit and the document. And a dimming filter that is movable in the relative movement direction and that diminishes the light emitted to the document and that includes a dimming region with a constant transmittance that gradually increases in area in the relative movement direction, and the document. An imaging lens that forms an image of the transmitted light on a recording material, and a slit that extends in a direction intersecting the relative movement direction in which the light imaged on the recording material by the imaging lens is a slit light. An exposure method for an image forming apparatus comprising: the dimming so that the light amount of the slit light of the light imaged on the recording material becomes a target light amount according to the color of the image recorded on the document. A filter and an exposure method of an image forming apparatus for moving the dimming filter. 9. A dimming amount of the light from the light source which is dimmed by all of the plurality of filters by the dimming filter according to a color of an image recorded on the document. 9. The dimming filter and the dimming filter are moved so that all or part of the dimming filter is dimmed by the dimming filter.
An exposure method for an image forming apparatus as described above.