JPH08166643A - Light source device - Google Patents

Abstract

PURPOSE: To prevent the cracking of an infrared absorption filter caused by heating by arranging a thermal conductive member brought into contact with the infrared absorption filter. CONSTITUTION: A light source 162 is arranged upward at the inside of a reflector 166, and the infrared absorption filter(IR filter) 168 for cutting infrared ray and protecting a light transmissible original T from a damage caused by heat so as to separate a space where the light source 162 is arranged from a lower space is arranged in the inside of the reflector 166 on the downstream side of the light source 162. In this case, a film scanning unit 18 is laid on the light source device, and a heat-resistant glass 200 which is the same size as the IR filter 168 is arranged as the thermal conductive member so as to be placed on the upper surface of the IR filter 168. Thus, both are brought into contact with each other by placing the heat-resistant glass 200 on the upper surface of the IR filter 168, so that the heat(hatched line) of the IR filter 168 heated by the absorption of the infrared ray is transmitted and is consequently absorbed by the heat-resistant glass 200.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light source device for irradiating an original in order to form transmitted light or reflected light of an original for image recording or image reading in an image recording apparatus or an image reading apparatus. .

[0002]

2. Description of the Related Art In an image recording apparatus such as a copying machine or a printer, or an image reading apparatus such as a scanner, the target original image is usually a reflection original such as a printed matter or a photograph. However, with the recent diversification of image information recording, in addition to reflective originals such as printed matter, slides, proofs,
An image recording apparatus and an image reading apparatus capable of using a transparent original such as a microfilm or a negative film as an original image have been put into practical use.

In an image recording (reading) apparatus for a reflected original such as a printed matter, the reflected original is irradiated with light emitted from a light source, and the reflected light carrying the original image reflected by the original is recorded on a recording material such as a photosensitive material. An image of the original is recorded by forming an image on and exposing the original, or an image of the original is read by forming an image on a line sensor such as a CCD sensor and photoelectrically reading the image. On the other hand, in an image recording (reading) device for a transparent original such as a negative film, light emitted from a light source is incident on the transparent original, and the photosensitive material is similarly exposed by the transmitted light carrying the original image transmitted through the original. Then, the image is recorded or the image is read using a CCD sensor or the like.

In such an image recording (reading) device, in order to carry out highly accurate image recording (reading) and stably obtain an appropriate image (print), a photosensitive material to be used, a CCD sensor, etc. The image receiving element, a light source having a sufficient amount of light according to the type of the original, the state of the image, etc. are required, and a large amount of light such as a halogen lamp is usually used. However, these light sources generally generate a large amount of heat, that is, emit infrared rays, and damage of the document due to this heat often poses a problem.

In particular, when a negative film such as a negative film or a negative original plate is used as an original document, since the images taken by a large number of unspecified general users are targeted, the photographing state of the original document is not constant and the exposure amount is excessive. Many negative films are also used as manuscripts. Therefore, in a device that can use a negative film as a document, a light source with a large amount of light is used so that sufficient color / density correction can be performed and stable and proper printing can be obtained even from a negative film with an excessive amount of exposure. Protecting the original from heat as it emerges from the light source is a serious problem, in addition to the need for, and the fact that films are generally heat sensitive.

[0006]

In order to solve such a problem, in a conventional image recording (reading) apparatus, an infrared reflection filter or an infrared absorption filter is arranged between a light source and an original, and the infrared rays are incident on the original. Infrared is cut. The infrared reflection filter is generally an infrared interference filter using a dichroic film, but since the dichroic film is used, the light reflection efficiency depends on the incident angle,
There are many infrared rays that pass through, and there is a problem that infrared rays cannot be cut well. Moreover, ordinary infrared reflection filters cannot cut far infrared rays having a wavelength of about 1.5 to 3 μm. Affects the document temperature.

On the other hand, since the infrared absorption filter absorbs infrared rays internally, it has the advantages that the absorption efficiency does not depend on the incident angle and far infrared rays can also be absorbed appropriately.
However, since the infrared absorption filter itself is heated by absorbing infrared rays, especially in a device using a light source with a large amount of light such as the above-mentioned negative film used as a document, the infrared absorption filter easily breaks beyond the heat resistant temperature. However, there is a problem that it cannot be used.

An object of the present invention is to solve the above-mentioned problems of the prior art, and is a light source device used in an image recording device or an image reading device, in order to prevent the document from being damaged by heat from the light source. In a device in which an infrared absorption filter is arranged between a document and a light source, the heat resistance of the infrared absorption filter is significantly improved, and even if the device uses a large amount of light source, the infrared absorption filter is cracked by heat. Another object of the present invention is to provide a light source device that prevents the above-mentioned problem and enables safe use.

[0009]

In order to achieve the above-mentioned object, the present invention is used for an apparatus for recording or reading an image by forming an image of transmitted light or reflected light of an original on an image receiving element. A light source device for irradiating light for recording or reading an image on a light source, an infrared absorption filter arranged between the light source and a document, and the infrared absorption filter arranged in contact with the infrared absorption filter. Provided is a light source device comprising a light-transmitting heat conductive member made of a material different from that of the filter.

Further, it is preferable that the heat conductive member is arranged closer to the light source than the infrared filter.

[0011]

The light source device of the present invention is for irradiating a document with light in an image recording device or an image reading device to form transmitted light or reflected light which carries a document image for image recording or reading. In the above light source device, an infrared absorption filter is arranged between the document and the light source, and a light-transmitting heat conductive member made of a material different from the infrared filter such as heat-resistant glass is arranged in contact with the infrared absorption filter. To do.

As described above, in the light source device, the infrared absorption filter is used to protect the original from the heat of the light source. However, the infrared absorption filter does not depend on the incident angle in its absorption characteristics, and far infrared rays are also suitable. However, in an apparatus using a light source with a large amount of light, the infrared absorption filter easily breaks beyond the heat-resistant temperature and cannot be used.

On the other hand, in the light source device of the present invention, since the heat conductive member such as heat-resistant glass is arranged in contact with the infrared absorption filter, the heat of the infrared absorption filter is conducted to the heat conductive member to be absorbed. The temperature of the infrared absorption filter can be lowered. In particular, by disposing the heat conductive member on the light source side, the heat conductive member can be brought into contact with the portion of the infrared absorption filter where the heat generation amount is high to absorb heat. Can be prevented. Therefore, according to the light source device of the present invention, it is possible to significantly improve the heat resistance of the infrared absorption filter and prevent cracking due to heating, and even if the device uses a large capacity light source, the infrared absorption filter Can be used.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The light source device of the present invention will be described below in detail with reference to the preferred embodiments shown in the accompanying drawings.

FIG. 1 is an external perspective view of an embodiment of an image recording apparatus using the light source device of the present invention, FIG. 2 is a schematic diagrammatic sectional view of the internal structure, and FIG. 3 is its slit scanning exposure apparatus. And Figure 2 shows a schematic schematic cross section of a film scanning unit. The image recording apparatus of the illustrated example is an apparatus that uses a photothermographic material that requires a heat development step as a recording material and that transfers an image to an image receiving material having an image receiving layer in the presence of an image forming solvent such as water. Yes, not only reflective originals such as printed matter and photographs and transparent positive originals such as 135-size slides and proofs, but also original images of transparent negative originals such as negative films are positive-positive photosensitive materials and negatives corresponding to the originals. A device capable of recording an image on a positive photosensitive material.

The image recording apparatus 10 has a box shape as a whole, and a front door 14 and a side door 16 are attached to the apparatus body 12. The inside of the apparatus main body 12 can be exposed by opening each door. Note that each door is provided with a safety device by a so-called interlock mechanism (not shown) so that the power of a predetermined portion can be turned off at the same time when the door is opened.

A platen cover 17 for pressing an original placed on a platen (original plate) is detachably attached to the upper portion (left side in the drawing) of the main body 12 of the image recording apparatus 10. In addition, at the upper part (right side in the figure) of the device main body 12,
A film scanning unit 18 for copying small transparent originals such as 5 size negative films and slides is detachably mounted. This film scanning unit 18
The light source device of the present invention is used. Also, 4 × 5
When copying a relatively large transparent document such as a size slide, proof, or sleeve, the platen cover 17 is removed or opened, and a light source unit for copying a transparent document is placed at a predetermined position on the upper surface that covers the platen. Placed.
Further, behind the film scanning unit 18, above the apparatus main body 12 of the image recording apparatus 10, a monitor 19 for displaying an original image read by a line sensor 160 described later prior to exposure to the photothermographic material. Are placed.

A device body 1 of the image recording device 10 shown in FIG.
2 inside, the photosensitive material magazine 20 is located below the central portion.
And a photosensitive material roll 22 in which the photothermographic material A is wound in a roll shape is housed inside. The photothermographic material A is wound and housed so that its photosensitive (exposure) surface faces downward when pulled out. A drawing port for the photothermographic material A is formed in the upper right portion of the photosensitive material magazine 20 in the drawing, and a pair of drawing rollers 24 for drawing and conveying the photothermographic material A from the photosensitive material magazine 20 are arranged in the vicinity thereof. ing.

Photothermographic material A of pull-out roller pair 24
The cutter 2 is provided downstream (hereinafter simply referred to as “downstream”) in the conveying direction of the sheet.
6 is arranged to cut the photothermographic material A drawn from the photosensitive material magazine 20 into a predetermined length. The cutter 26 is composed of, for example, a fixed blade and a movable blade, and cuts the photothermographic material A by moving the movable blade up and down by a known means such as a cam to engage with the fixed blade. After the operation of the cutter 26, the pull-out roller pair 24 is rotated in the reverse direction so that the photothermographic material A is fed back to the extent that the leading end is slightly sandwiched by the pull-out roller pair 24. Further, after the reverse feeding, the nip of the photothermographic material A by the pull-out roller pair 24 may be released to prevent damage to the tip portion.

On the downstream side of the cutter 26, a pair of conveying rollers 28 and 3 are arranged so as to convey the photothermographic material A upward.
No. 0, conveyance guide plates 32, 34 and 36 are arranged to convey the photothermographic material A to the exposure section 38. The exposure unit 38 is set between the pair of transport rollers 38a and 38b, and an exposure device 40 is provided on the upper portion. In the image recording apparatus 10 of the illustrated example, the photothermographic material A is exposed in the exposure unit 38 while being conveyed while being defined at a predetermined position by the conveyance roller pairs 38a and 38b in the exposure unit 38.
Alternatively, slit scanning exposure is performed by the slit light carrying the document image information from the film scanning unit 18.
The exposure device 40 and the film scanning unit 18 will be described in detail later.

A conveyance guide plate 42 is provided on the side of the exposure section 38.
a and a switchback unit 4 having a transport roller pair 44
2 is provided, and a water coating section 46 is installed below the exposure section 38. The photothermographic material A, which is drawn out from the photosensitive material magazine 20 and conveyed, and exposed imagewise in the exposure section 38, is once carried into the switchback section 42 by the conveying roller pair 44 and the like, and then the conveying roller pair 44 is reversed. Is discharged from the switchback unit 42, guided by the conveyance guide plate 48, and conveyed to the water application unit 46.

The water coating section 46 has a coating tank 50 filled with an image forming solvent, and a guide member 52 arranged so as to face the coating tank 50. In addition, the water application section 4
The photothermographic material A at the upstream end of the coating tank 50 of No. 6
A supply roller 54 for carrying the toner into the coating tank 50, and a squeeze roller pair 56 for removing excess water from the photothermographic material A are arranged at the downstream end thereof. The photothermographic material A exposed in the exposure unit 38 is supplied to the supply roller 5
4, the water as the image forming solvent is applied by passing between the application tank 50 and the guide member 52, and is sandwiched and conveyed by the squeeze roller pair 56 to remove excess water.

On the bottom surface of the coating tank 50, that is, on the surface of the photothermographic material A facing the exposed surface, a plurality of rows of ribs are formed so as to be inclined with respect to the conveying direction of the photothermographic material A. The frictional resistance when the photosensitive material A passes is reduced, and at the same time, the heat-developable photosensitive material A is prevented from being scratched at a certain position. The guide member 52 is made of a metal material such as aluminum, is rotatably supported coaxially with the supply roller 54, and is configured to be contactable with and separable from the coating tank 50.

A thermal development transfer section 58 is arranged downstream of the water application section, and the photothermographic material A from which excess water has been removed by the application of water and the squeeze roller pair 56 is fed.

On the other hand, an image receiving material magazine 60 is arranged on the right side of the photosensitive material magazine 20 in the drawing, and an image receiving material roll 62, in which the image receiving material B is wound in a roll shape, is housed inside. The image receiving material B is wound and stored so that the image transfer surface of the image receiving material B faces upward. Further, the image receiving material B is formed to have a smaller dimension in the width direction (direction orthogonal to the transport direction) than the photothermographic material A in order to facilitate peeling after thermal development described later. An outlet for the image receiving material B is formed in the lower left portion of the image receiving material magazine 20 in the figure, and a pull-out roller pair 64 that pulls out and conveys the image receiving material B from the image receiving material magazine 60 is arranged in the vicinity thereof. After the image receiving material B is pulled out by the pull-out roller pair 64, the pull-out roller pair 64 releases the holding of the image receiving material B and prevents the tip portion from being damaged.

A cutter 6 is provided downstream of the pair of pull-out rollers 64.
6 is arranged and the image receiving material B pulled out from the image receiving material magazine 60 is cut into a predetermined length. Cutter 66
Is composed of, for example, a fixed blade and a movable blade, and the movable blade is moved up and down by a known means such as a cam to engage with the fixed blade to cut the image receiving material B. The image receiving material B is cut into a shorter length than the photothermographic material A in order to facilitate peeling after the heat development described later.

Downstream of the cutter 66, a pair of conveying rollers 6 is provided.
8, 70 and 72 and conveyance guide plates 774, 76 and 78 are arranged, and the image receiving material B cut into a predetermined length is conveyed upward from below the photosensitive material magazine 20 and is carried into the heat development transfer section 58. Here, the pair of conveying rollers 72 also serves as a registration roller for correcting so-called skew of the conveyed image receiving material B, whereby the image receiving material B has its skew corrected and the thermal development transfer portion 58.
Be delivered to.

A laminating roller 80 for laminating the photothermographic material A and the image receiving material B is arranged downstream of the squeeze roller pair 56 and the conveying roller pair 72.
The bonding roller 80 is a roller whose outer peripheral surface is covered with silicon rubber (for example, wall thickness 2.53 mm, hardness about 40 degrees), and is urged by a predetermined force (for example, about 9 kg) at both ends in the axial direction. It is pressed against the heating drum 82 of the heat development transfer section 58. The laminating roller 80 is connected to the drum motor 84 by a known driving force transmission system (not shown), and the driving force of the drum motor 84 is transmitted to rotate the laminating roller 80. In the copying machine 10 of the illustrated example, the photothermographic material A and the image receiving material B by the bonding roller 80 are used.
The conveyance speed by the squeeze roller pair 56 and the conveyance roller pair 72 is slightly (for example, about 2%) with respect to the conveyance speed of
The photothermographic material A and the image receiving material B are set to be late, and are conveyed by the bonding roller 80 while receiving a slight back tension.

The photothermographic material A comprises a squeeze roller pair 8
6 is carried in between the laminating roller 80 and the heating drum 82, while the image receiving material B is the photothermographic material A.
After the heat-developable photosensitive material A is carried in by a predetermined length in advance, the heat-developable photosensitive material A is carried in between the bonding roller 80 and the heating drum 82, and both are superposed. As described above, the photothermographic material A has a size slightly longer than the image receiving material B in both the width direction and the longitudinal direction (conveying direction). The image receiving material B is projected.

A cam 86 and a filler 88 are fixed to the side surface of the heating drum 82 of the heat development transfer section 58.
The cam 86 is configured to be engageable with peeling claws 90 and 92 of the heating drum 82, which will be described later, and is sequentially engaged with the peeling claws 90 and 92 and rotated by the rotation of the heating drum 82. The filler 88 is used to detect the alignment of the heating drum 82 with the photothermographic material A and the image receiving material B.

Inside the heating drum 82, a pair of halogen lamps 82a and 82b are arranged. The halogen lamps 82a and 82b are each, for example, 400
It has outputs of W and 450 W, and raises the surface of the heating drum 82 to a predetermined temperature (for example, 82 ° C.). In the image recording apparatus 10 of the illustrated example, both halogen lamps 82a and 82b are used when the temperature of the heating drum 82 is raised,
In normal operation after the heating drum 82 reaches a predetermined temperature,
Only the halogen lamp 82a is used.

A roller 94 is provided around the heating drum 82.
An endless belt 96 stretched around five rollers a, 94b, 94c, 94d and 94e is pressed against the rollers. The endless belt 96 has a structure in which a woven fabric material is covered with rubber.
The rollers 94a, 94b, 94c and 94d are each made of stainless steel, and the roller 94e is made of rubber.
The outer side of the endless belt 96 between 4a and 94e is pressed against the outer circumference of the heating drum 82. Further, the roller 94c is
Both ends in the axial direction have a shape in which the diameter gradually increases toward the outside of the axis, and the heating drum 82 is provided at both ends in the axial direction.
It is urged by a force of about 2 kg in a direction away from.
As a result, the endless belt 96 is kept at a constant tension to maintain the pressure contact force to the heating drum 82, and the endless belt 96 is prevented from being biased due to rotation.

As described above, the roller 94e is a rubber roller and is connected to the drum motor 84 by a known driving force transmission system (not shown). That is, the copying apparatus 1 in the illustrated example
At 0, the endless belt 96 is rotated by the rotation of the roller 94e, the rotational force is transmitted by the frictional force between the endless belt 96 and the heating drum 82, and the heating drum 82 is driven.

The drum motor 84 has a plurality of driving parts, that is, a driving force transmission system (not shown), which is known in the art.
The roller 94e, the laminating roller 80, the squeeze roller pair 56, and the bending guide roller 97, the peeling roller 98, the photosensitive material discharging roller pairs 100 and 102, the image receiving material discharging roller pairs 104, 106 and 108, which will be described later, are driven together. ing.

The heat-developable photosensitive material A and the image receiving material B adhered by the adhering roller 80 are kept in the superposed state and are spread over almost 2/3 of the heating drum 82 (between the rollers 94a and 94e). , Heating drum 8
2 and the endless belt 96 are nipped and conveyed. In the apparatus 10 of the illustrated example, the heating drum 82 rotates (that is, the roller 94 in the state where the photothermographic material A and the image receiving material B are completely housed between the heating drum 82 and the endless belt 96).
(rotation of e) is stopped, and the photothermographic material A and the image receiving material B are heated for a predetermined time. In the image formation of the illustrated example,
The photothermographic material A releases a movable dye by being heated, and at the same time, the dye is transferred to the dye fixing layer of the image receiving material B, and a visible image is formed on the image receiving surface of the image receiving material B. .

A bending guide roller 97 is arranged downstream of the roller 94e in the rotation direction of the heating drum 82. The bending guide roller 97 is a roller made of silicone rubber, and is pressed against the outer peripheral surface of the heating drum 82 with a predetermined force, so that the photothermographic material A and the image receiving material B conveyed by the heating drum 82 and the endless belt 96 are transferred. Further convey.

The peeling claw 9 is provided downstream of the bending guide roller 97.
0 and pinch roller 110 are arranged. The peeling claw 90 is rotatably supported at its central portion, and is rotated by the action of the above-described cam 86, so that the heating drum 82 is rotated.
It is possible to approach and separate from the surface of. Also, pinch roller 1
Normally, 10 is abutted against the bending guide roller 97 with a predetermined pressure, and when the peeling claw 90 comes into contact with the heating drum 82 according to the rotation of the peeling claw 90, it is separated from the bending guide roller 97. Composed.

When the photothermographic material A and the image receiving material B are conveyed to the position of the peeling claw 90, the peeling claw 90 is brought into contact with the heating drum 82 by the action of the cam 86, and they are superposed on each other by a predetermined length in advance. The tip of the photothermographic material A is engaged with the peeling claw 90 to heat the photothermographic material A to the heating drum 82.
Peel from. When the predetermined length of the tip of the photothermographic material A is peeled from the heating drum 82, the peeling claw 90 is separated from the heating drum 82 by the action of the cam 86, and at the same time, the pinch roller 110 is brought into contact with the bending guide roller 97. The peeled end of the heat-developable photosensitive material A to the pinch roller 1
It is sandwiched by 10 and the bending guide roller 97. Therefore, the photothermographic material A separated from the heating drum 82
Is pinched and conveyed downward by the pinch roller 110 and the bending guide roller 97.

Downstream of the pinch roller 110 and the bending guide roller 97, a pair of photosensitive material discharge rollers 100 and 1 are provided.
02, a plurality of guide rollers 112, a conveyance guide plate 114
Is arranged, and the photothermographic material A separated from the heating drum 82 is conveyed downward, and further conveyed leftward in the drawing,
It is configured to be accumulated in the waste photosensitive material storage box 116. Here, the pair of photosensitive material discharge rollers 100 and 102
Is 1 to 1 than the peripheral speed of rotation of the heating drum 82.
The heat-developable photosensitive material A is set so as to be delayed by about 3% so as not to apply an excessive tension to the photothermographic material A. Further, a drying fan 124 is arranged near the transport guide plate 114 to accelerate the drying of the photothermographic material A.

A peeling roller 98 and a peeling claw 92 are arranged downstream of the bending guide roller 97 and the peeling claw 90 in the rotation direction of the heating drum 82. The peeling roller 98 is a roller made of silicon rubber having a surface roughness of 25 S or more, is brought into contact with the outer periphery of the heating drum 82 with a predetermined pressure, and is rotated by the action of the drum motor 84 as described above. On the other hand, the peeling claw 92
Is rotated by the action of the cam 86 described above, and is configured to be able to come into contact with and separate from the outer peripheral surface of the heating drum 82. When the photothermographic material A is peeled off and only the image receiving material B is conveyed by the heating drum 82, the peeling claw 92 is caused by the action of the cam 86.
Comes into contact with the heating drum 82 to peel off the front end of the image receiving material B, and also comes into contact with the heating drum 82 at the peeling roller 98.
And the peeling claws 92 bend and guide the image receiving material B downward.
Transport.

Downstream of the peeling roller 98, a pair of image receiving material discharging rollers 104, 106 and 108, and a conveyance guide plate 1 are provided.
17 and 118 are arranged, and the image receiving material B separated from the heating drum 82 is conveyed further downward and leftward in the drawing,
The sheet is discharged onto a tray 126 fixed to the left side surface of the apparatus body 12. Here, the drum fan 120 is disposed near the transport guide plate 117, and accelerates the drying of the image receiving material B together with the heating by the heating drum 82. It should be noted that the drum fan 120 operates only when necessary in accordance with the atmospheric conditions in order to make the temperature distribution of the heating drum 82 uniform. Further, a ceramic heater 122 is arranged on the transport guide plate 118 to further accelerate the drying of the image receiving material B.
The temperature of the ceramic heater 122 is around 70 ° C.

The heat-development transfer section 5 having the above structure.
8 is configured as one unit as a whole, and is configured to be rotatable with respect to the apparatus main body 12 in the direction opposite to the water application section 46. Therefore, after the side door 16 of the apparatus main body 12 is opened, the heat development transfer portion 58 is moved to be opened so that the jamming process and the like can be easily performed.

Next, referring to FIG. 3, the image recording apparatus 10
The exposure device 40 and the film scanning unit 18 will be described. The exposure device 40 is basically an exposure optical system used when copying a reflective original such as a printed matter or a photograph, and copying an image of a relatively large transparent original such as a proof or a sleeve. As shown in FIG. 3, on the upper surface of the main body 12 of the image recording apparatus 10, a platen (original plate) 130 such as transparent glass for placing a reflective original and a reflective original are fixed to the original table 130. A detachable platen cover (original pressure plate) 17 is arranged. Also,
When copying an image of a relatively large transparent original such as a proof or a sleeve, the platen cover 17 is removed, and a transparent original light source unit for illuminating the transparent original placed on the original table 130 from above is predetermined. Placed in the position.

Below the document table 130, a light source 134 for exposure when copying an image of a reflection document and a reflector 13 are provided.
6 and the mirror 138 are integrally arranged in the light source unit. In the apparatus of the illustrated example, the reflector 136 also serves as a slit that regulates the width in the scanning direction of the reflected light (or the transmitted light of the transmissive original) reflected by the reflective original emitted by the light source 134. The light source unit moves the lower surface of the document table 130 in the scanning direction indicated by the arrow a, and irradiates the reflection document with the light source 134. When copying a large transparent original using the transparent original light source unit, the light source unit scans the lower surface of the original table 130 without turning on the light source 134, and the transmitted light of the transparent original passes through the slit. .

The reflected light emitted from the light source 134, reflected by the reflective original, passed through the slit and reflected in the predetermined direction by the mirror 138, is then reflected by the two mirrors 140a.
And 140b are incident on a mirror unit configured integrally, and are reflected in a predetermined direction along the optical path L. This mirror unit is configured to move in the same direction as the above-mentioned light source unit at a speed of 1/2.

At the downstream of the mirror unit in the optical path L, there is arranged a lens unit 142 in which an imaging lens and a variable diaphragm for adjusting the amount of light (that is, density) are integrally formed. The variable diaphragm is composed of, for example, two light-shielding plates that are arranged so as to face each other in a direction orthogonal to the optical path L and can be inserted into the optical path. By adjusting the gap between both light-shielding plates, the amount of reflected light can be adjusted. adjust.

A color filter unit is arranged downstream of the lens unit 142. The color filter unit includes, for example, a Y (yellow) filter 144Y, an M (magenta) filter 144M, and a C (cyan) filter 144Y.
The color balance of the reflected light is adjusted by adjusting the insertion amount of each color filter plate into the optical path L.

Downstream of the color filter unit in the optical path L,
Mirrors 146, 148 and 150 that reflect the reflected light in a predetermined direction are arranged. The reflected light traveling along the optical path L is reflected by each of these mirrors in a predetermined direction,
And the image is formed on the photothermographic material A, which is scanned and conveyed in the exposure section 38, for exposure. Here, the mirror 148 is configured to be rotatable, and in image recording of a reflective original and a large transparent original using the exposure device 40, FIG.
In image recording of a small transparent original T such as a color negative film using the film scanning unit 18, it is moved to the position shown by the dotted line in FIG.

Further, the exposure device 40 is provided with an image sensor (not shown) for measuring the amount of reflected light for each of red (R), green (G), and blue (B), and a document image is prescanned to obtain an original image. After reading, the variable diaphragm of the lens unit and the insertion amount of each color filter plate of the color filter unit into the optical path L are determined.

The image recording apparatus 10 of the illustrated example is an apparatus capable of recording an image of a small transparent original such as a negative film or a slide, and an image of the transparent original T is shown on the upper right side of the apparatus main body 12 in the figure. A film scanning unit 18 constituting a slit scanning exposure optical system for copying is detachably mounted, and a zoom lens constituting a slit scanning exposure optical system of a transparent original T is provided inside an exposure device 40 below the film scanning unit 18. A moving mirror 156, an image forming lens 158, and a line sensor 160 for measuring the light amount, the color, and the like of the transmitted light of the transparent original T are arranged.

The film scanning unit 18 includes a light source 162.
Is emitted to the transparent original T that moves in synchronization with the conveyance of the photothermographic material A, and the transmitted light that has passed through the transparent original T and passed through the slit 164 is reduced to 200% to 850% by the zoom lens 152. By enlarging and projecting on the photothermographic material A, the photothermographic material A is exposed by the transmitted light of the transmissive original T, and the image of the transmissive original T is copied.

The light source 162 may be any color light source such as a halogen lamp or a flash lamp. Further, a light source 162 is inserted inside, and a reflector 166 for reflecting the light from the light source 162 to the transparent original T side is arranged to improve the light efficiency. In addition, the reflector 166 is
An opening for passing light is formed at the lower end, and an opening for inserting the color filter of the filter portion is formed on the left side surface in the drawing.

As shown in FIG. 3, the light source 162 is arranged above the reflector 166, and inside the reflector 166 downstream of the light source 162, the space where the light source 162 is arranged and the space below are separated. An infrared absorption filter (hereinafter referred to as an IR filter) 168 for cutting infrared rays to protect the transparent original T from heat damage is arranged. Here, the film scanning unit 18 is related to the light source device of the present invention, and includes the IR filter 16
The IR filter 168 is mounted on the upper surface of
A heat-resistant glass 200 having almost the same size as the above is arranged as a heat conductive member.

As described above, the transparent original T
In a device that can use a negative film as the light source 16
It is necessary to use a large amount of light as 2, but in a light source device using such a large amount of light, the IR filter 168 can easily be used at a heat resistant temperature (for example, HA50 manufactured by HOYA Glass Co., Ltd.).
In that case, it will crack above 585 ° C). On the other hand, in the film scanning unit 18 according to the present invention, by placing the heat resistant glass 200 on the upper surface of the IR filter 168 and bringing them into contact with each other, as schematically shown in FIG. The heat (hatched line) of the IR filter 168 heated by absorption of infrared rays is transmitted to the heat-resistant glass 200 to be absorbed, and the heat is dispersed,
The temperature of the IR filter 168 can be lowered. That is, in the present invention, by disposing the heat-resistant glass 200 in contact with the IR filter 168, the heat capacity of the IR filter 168 can be increased, and the same effect as that of greatly improving the heat resistance can be obtained. Even in a device using a light source with a large amount of light as shown in the figure, the IR filter 1
It is possible to prevent the 68 from breaking beyond the heat resistant temperature.

As an example, in the light source device having the same structure as the film scanning unit 18 in the illustrated example except that the heat resistant glass 200 is not arranged, the above-mentioned H as the IR filter 168 is used.
When A50 (95 mm x 36 mm x 2 mm heat-resistant product) is used, if a 300 W halogen lamp is used as the light source 162, the IR filter 168 will break in about 10 seconds. On the other hand, the heat-resistant glass (95
If the film scanning unit 18 according to the present invention on which a Pyrex) 200 mm × 32 mm × 2 mm is mounted, the light source 1
Even if a 300 W halogen lamp is used as 62, IR
The filter 168 did not crack. According to the experiments by the present inventors as described above, by using the light source device of the present invention, the same effect as improving the heat resistance of the IR filter 168 by about 1.5 times can be obtained.

In the light source device of the present invention, the heat resistant glass 2
The arrangement position of 00 is not particularly limited, and the IR filter 16
It may be arranged so as to be in contact with 8. However, the normal I
The R filter 168 internally absorbs and cuts infrared rays, and therefore, as schematically shown in FIG.
The incident position (surface) is heated most, and the temperature becomes lower toward the downstream side in the light traveling direction. A major cause of cracking of the IR filter 168 is strain caused by a difference in thermal expansion due to a partial temperature difference. Therefore, the heat-resistant glass 20
It is preferable that 0 is arranged in contact with the position where the IR filter 168 is heated most, and the light source 162 is closer to the IR filter 168 than the IR filter 168, that is, in the illustrated example
Most preferably, it is mounted on the upper surface of 8.

As described above, in the present invention, the temperature of the IR filter 168 is lowered by transferring the heat of the IR filter 168 to the heat resistant glass 200. Therefore, it is preferable that the heat-resistant glass 200 and the IR filter 168 be in contact with each other as close as possible with no gap. Here, the heat resistant glass 200 and the IR filter 168 are
In order to avoid diffuse reflection of light, it is usually used after being both surface-polished, but it is impossible to completely contact both surfaces, and it is usually a gap of several tens of μm at maximum. Will occur. However, if the gap is within this range, heat conduction from the IR filter 168 to the heat resistant glass 200 is not significantly disturbed, and a sufficient heat resistance improving effect of the IR filter 168 can be obtained. In the above-mentioned experiment by the present inventor, it was confirmed from the appearance state of Newton's rings on the contact surface between the IR filter 168 and the heat-resistant glass 200 that a maximum gap of several tens of μm was present between them. This point is also confirmed from the fact that the IR filter 168 did not crack and showed a sufficient heat resistance improving effect as described above.

In the present invention, if the IR filter 168 satisfies the optical characteristics, the above-mentioned HA50 is used.
All known infrared absorption filters such as the above can be used. As the heat-resistant glass 200, various commercially available heat-resistant glasses such as Pyrex can be used. As the heat conductive member, other than the heat resistant glass 200, quartz glass, organic glass, etc. may be used as long as they are materials different from the IR filter 168 and satisfy optical characteristics and have sufficient heat resistance. Although all the materials described above can be used, heat resistant glass such as Pyrex is usually used in view of heat resistance, specific heat, optical characteristics, cost and the like. The size of the heat-resistant glass 200 is not limited, but the larger the contact surface is, the better the effect is. Therefore, the IR filter 16 is usually used.
It may be about the same size as 8.

In the present invention, an infrared reflecting film for reflecting at least a part of infrared rays may be formed on one surface of the heat resistant glass 200. With such a configuration, it is possible to more reliably prevent damage to the IR filter 168 due to heat. As the infrared reflecting film, a known one such as a dichroic film can be used. Further, with such a configuration, since a part of infrared rays is reflected by the light source 162, when a halogen lamp or the like is used as the light source 162, the filament temperature is improved to improve the luminous efficiency of the lamp. The structure can be improved, and a structure similar to a so-called cool lamp in which an infrared reflection film is formed on the surface of a halogen lamp can be obtained.

The heat-resistant glass 200 was not used, and the IR
The heat resistance of the IR filter 168 can be improved even if an infrared reflecting film is formed on the filter 168. However, if the infrared reflecting film is mistakenly placed on the lower (downstream) surface of the IR filter 168, the heat resistance of the IR filter 168 is completely reduced. There is a problem that the improvement effect cannot be obtained, and the present invention using the heat-resistant glass 200 is better in terms of the heat resistance improvement effect. Also,
In the present invention using the heat-resistant glass 200, an infrared reflecting film may be formed on the IR filter 168, but the inconvenience when the upper and lower surfaces are mistaken remains.

Downstream of the IR filter 168, the light near the optical axis of the zoom lens 152 is condensed to improve the light collection efficiency, and the light incident on the transparent original T and the diffusion glass 182 described later in the vertical direction. Lens 20 for increasing
2 is arranged, and further downstream thereof, a filter unit for adjusting the color balance of the light illuminating the transparent original T and adjusting the color balance of the formed image is arranged. The filter unit includes a Y filter 174Y, an M filter 174M, and a C filter 17
4C 3 color filter plates, and each filter to the optical path L
and a driving device 176 to be inserted at t. The driving device 176 is composed of a driving source such as a pulse motor and a known moving (transmitting) means such as a rack and pinion. When the image forming conditions are set, the color adjustment amount by the user, the exposure correction condition of the transparent original T, and the like are set. According to the color adjustment amount, each color filter is inserted in the optical path Lt by the set insertion amount. In this way, the color balance of the light irradiating the transparent original T, that is, the light exposing the photothermographic material A is adjusted by each color filter, and the color balance of the formed image is adjusted.

A variable diaphragm 184 for adjusting the light quantity (light intensity) of the light illuminating the transparent original T is arranged downstream of the opening of the reflector 166. The variable diaphragm 184 is provided with a driving device 186. . The variable diaphragm 184 is composed of a light-shielding plate, an ND filter having a density gradient, etc., and in the apparatus of the illustrated example, the driving device 186 adjusts the amount of light by adjusting the amount of insertion of the variable diaphragm 184 into the optical path Lt. To do. The drive unit 186 is the drive unit 17
The configuration is the same as that of 6, and the variable diaphragm 184 is moved according to the density adjustment amount such as the exposure correction condition of the transparent original T to adjust the insertion amount in the optical path. In this way, the exposure amount of the photothermographic material A, that is, the density of the formed image is adjusted. The amount of insertion of each filter into the optical path by the driving device 176 and the amount of insertion of the variable stop 184 into the optical path by the driving device 186 are determined by the control device 178.

Downstream of the variable aperture 184, a UV cut filter 170 for cutting ultraviolet rays, and a BG notch filter 172 for separating blue light and green light are provided.
Diffusing glass 180 for diffusing and mixing the light whose color is adjusted by the filter unit and whose light amount (density) is adjusted by the variable diaphragm 184, and which is vertically incident on the transparent original T as uniform light without color unevenness or illumination unevenness. And a Fresnel lens 182 is arranged.

The transparent original T is loaded on the scan table 188 arranged downstream of the Fresnel lens 182.
The scan table 188 scans the transparent document T by holding the transparent document T at a predetermined position and transporting the transparent document T in the arrow direction in the figure in synchronization with the transport of the photosensitive material A in the exposure device 40. To do. The method of moving the transparent original T by the scan table 188 is not particularly limited, and any known conveying means such as screw transmission, winding transmission, rack and pinion, etc. can be used. Also,
The moving speed of the transparent original T is 1 / n when the conveying speed of the photosensitive material A is 1 and the copying magnification by the film scanning unit 18 is n.

The transmitted light that has passed through the transparent original T passes through the slit 164 that determines the width of the exposure slit for the photothermographic material A, travels along the optical path Lt, and enters the zoom lens 152 disposed in the exposure device 40. Incident. Zoom lens 15
2 enlarges the transmitted light of the transparent original T which has passed through the slit 164 to 200% to 850% and forms an image at the exposure position of the exposure unit 38.

The transmitted light of the transparent original T which has passed through the Zumm lens 152 is deflected by about 90 ° in the optical path by the mirror 154, and is incident on the mirror 150 while the optical path L of the reflected light from the reflective original is aligned with the optical path. As described above, when the image of the transparent original T is copied using the film scanning unit 18, the mirror 148 is rotated to the position shown by the dotted line in the figure.

The transmitted light of the transparent original T which is incident on the mirror 150 and reflected downward is similar to the reflected light from the reflective original, and is a predetermined portion of the photothermographic material A that is scanned and conveyed by the conveying roller pairs 38a and 38b. An image is formed at the exposure position of, and this is subjected to slit scanning exposure. Here, the transparent original T moves by the scan table 188 in synchronization with the scanning and conveying speed of the photothermographic material A, that is, when the enlargement magnification of the projection optical system is n, it is 1 / n of the photosensitive conveying speed. Therefore, the transparent original T moves over the entire image area, so that the entire image of the transparent original T is scanned and exposed on the photothermographic material A.

The apparatus of the illustrated example reads the image of the transparent original T by performing a prescan before the image recording of the transparent original T, and the exposure amount at the time of image recording, that is, the Y filter 174Y, the M filter 174M in the filter portion, and the Optical path Lt of three color filter plates of C filter 174C
To the optical path Lt of the variable diaphragm 184 is determined.

As shown in FIG. 3, the zoom lens 1
Upstream of 52, the mirror 1 that can be inserted into the optical path Lt
56 are arranged. The mirror 156 is inserted in the optical path Lt as shown by the dotted line in the drawing during pre-scanning, and deflects the transmitted light of the transparent original T by 90 °. Mirror 15
The transmitted light whose optical path is deflected by 6 is the photometric lens 15
The focus is adjusted by 8, and the line sensor 160 is made incident and forms an image.

The line sensor 160 is composed of three rows of line sensors, that is, a line sensor having an R filter, a line sensor having a G filter, and a line sensor having a B filter. Each line sensor is, for example, a 256-pixel MOS (NMOS or CMOS) line sensor, and an image of the transparent original T is displayed with a resolution of 256 pixels per line for each color of R, G, and B. Can be read.

The image data signal output of the line sensor 160 is transferred to the control device 178, and the control device 178 uses the image signal read by the line sensor 160 to display a reproduced image on the monitor 19 and to display these images. The image feature amount is obtained from the signal, the appropriate exposure condition is obtained, the image feature amount of the designated main part is obtained as necessary, the exposure condition is corrected, and these exposure condition and the corrected exposure condition Determine the exposure conditions with manual adjustment of color and / or density added to. The controller 178
Then, the adjustment amount of color and / or density according to the obtained exposure condition, modified exposure condition or manually adjusted exposure condition, that is, color filters 174C, 174M, 174Y.
And / or the amount of insertion of each variable aperture 184 into the optical path Lt is calculated, and the information signals of these insertion amounts are supplied to the driving device 176 of the color filter 174 and the driving device 1 of the variable aperture 184.
In addition to the drive of the scan table 188, the drive control of the image recording apparatus of the illustrated example is performed.

The image recording apparatus 10 of the present invention is basically constructed as described above, and the operation will be described below by taking a typical example when copying the image of the transparent original T. The operator first loads the transparent original T on the scan table 188, sets the copy magnification, and then presses the start button. Then, the light source 162 is turned on, the scanning of the transparent original T is started by the scan table 188, and the prescan is started.

The light emitted from the light source 162 passes through the IR filter 168 to be cut into infrared rays, and the light in the vicinity of the optical axis is condensed by the condenser lens 202, and the UV cut filter 170 and the BG notch filter 172. After passing through the diffusion glass 180 and the Fresnel lens 182, the light enters the transparent original T and becomes the transmitted light that carries the image information of the transparent original T and passes through the slit 164. According to the filter scanning unit 18 of the light source device of the present invention,
Due to the action of the IR filter 168, the transparent original T due to heat is applied.
As described above, the IR filter 168 is preferably prevented from being heated. In addition,
At this time, the color filters 174Y to 174C and the variable diaphragm 184 are retracted from the optical path Lt. In addition,
These may be inserted in the optical path Lt according to the standard exposure conditions of the transparent original T.

The transmitted light passing through the slit 164 is shown in FIG.
Is deflected by 90 ° by a moving mirror inserted in the optical path Lt as indicated by a dotted line in FIG. 1, imaged on the line sensor 160 by the imaging lens 156, and photometry is performed for each color of R, G, and B. , The image of the transparent original T is separated into each color of R, G and B, and the image of the transparent original T is read with a resolution of 256 pixels per line.

The output from the line sensor 160 is transferred to the control device 178, and the control device 178 processes this output as described above, performs correction processing by, for example, LATD, and reproduces the original image read on the monitor 19. It is displayed as an image (a positive image if the transparent original T is a negative film). The operator observes the image displayed on the monitor and designates a main portion by a main portion designating means such as a mouse as necessary. The control device 178 has a designated main part and LAT.
Various image feature amounts are determined from D, and the exposure conditions, that is, the amount of each color filter plate 174Y to 174C inserted into the optical path Lt and the amount of the variable diaphragm 184 inserted into the optical path Lt are determined from the image feature amount. It determines and directs the drives 176 and 186.

In accordance with the exposure conditions thus determined, the driving devices 176 and 186 cause the color filter plates 174Y to 174C and the variable stop 184 to move the optical path L.
When t is inserted, the moving mirror 156 moves to the position shown by the solid line in the drawing and retracts from the optical path Lt, and the light source 162
Is turned on and scanning of the transparent original T is started, and main scanning, that is, image exposure of the transparent original T is started. As described above, the scanning speed at this time depends on the scanning speed of the photothermographic material A in the exposure section 38 and the image recording magnification.

The light emitted from the light source 162 passes through the IR filter 168, and the light in the vicinity of the optical axis is the condenser lens 2
No. 02, the UV cut filter 170 and the BG notch filter 172 are adjusted in color and density (light amount) by the color filters 174Y to 174C and the variable diaphragm 184 that are inserted according to the exposure conditions as described above. , Diffusion glass 180 and Fresnel lens 182
The light passes through the slit 164 and enters the transparent original T, becomes transmitted light that carries image information of the transparent original T, and passes through the slit 164.
As described above, in this device according to the present invention, the transparent original T is not adversely affected by heat, and the IR filter 16 is used.
The heating of 8 is also suitably prevented. The light that has passed through the slit 164 is magnified to a set magnification by the zoom lens 152 and reflected by the mirror 154. Here, as described above, when the image of the transparent original T is recorded, the mirror 14 is used.
Since 8 is rotated to the position shown by the dotted line in FIG. 3, the transmitted light is reflected by the mirror 150, extracted from the photothermographic material magazine 20 in time with the above operation, and cut into a predetermined length. Then, an image is formed on the photothermographic material A conveyed by the exposure section 38, and this is subjected to slit scanning exposure.

Photothermographic material A subjected to slit scanning exposure
Is once conveyed to the switchback unit 42, then conveyed in the opposite direction and then conveyed to the water application unit 46, and after being coated with water as an image forming solvent in the water application unit 46, the above operation and timing are adjusted. The image receiving material B, which has been pulled out from the image receiving material magazine 60, cut into a predetermined length, and conveyed, is attached to the image receiving material B by the attaching roller 80, and is carried into the heat development transfer section 58. The photothermographic material A and the image receiving material B, which have been conveyed by being nipped and conveyed by the endless belt 96 and the heating drum 82, are first peeled from the heating drum 82 by the peeling claw 90, Next, the image receiving material B on which the image is transferred is peeled off from the heating drum 82 by the peeling claw 92. The peeled photothermographic material A is guided by the transport guide plate 114 or the like and carried into the waste photosensitive material storage box 116, while the image receiving material B on which the image is transferred is guided by the transport guide plate 118 or the like. Tray 1
It is discharged to 26 and made into a hard copy.

The above description is an example in which the light source device of the present invention is used in the film scanning unit 18 for copying a small transparent original such as a negative film. However, the present invention is not limited to this and the reflection is performed. The light source device of the present invention can be suitably used for an optical exposure device 40 for copying an original or the like, or for the above-mentioned transparent original light source unit that is used by being placed on an original table when copying a large transparent original. Further, not only the direct exposure type copying apparatus as shown in the drawing but also an image reading apparatus such as a scanner or a reading unit of a digital copying apparatus can be suitably used.

Although the light source device of the present invention has been described above in detail, the present invention is not limited to the above examples, and various improvements and changes may be made without departing from the scope of the present invention. Of course.

[0081]

As described above in detail, according to the present invention, since the heat conductive member such as heat resistant glass is arranged in contact with the infrared absorption filter, the heat capacity of the infrared absorption filter can be increased. A device that uses a large amount of light source that can obtain the same effect, can significantly improve the heat resistance of the infrared absorption filter, can prevent cracking due to heating, and can use a negative film as a document. Also, it becomes possible to safely use the infrared absorption filter.

[Brief description of drawings]

FIG. 1 is a schematic perspective view of an embodiment of an image forming apparatus of the present invention.

FIG. 2 is a schematic cross-sectional view showing an internal configuration of the image recording apparatus shown in FIG.

FIG. 3 is a schematic cross-sectional view showing an internal configuration of an exposure device and a film scanning unit of the image recording device shown in FIG.

FIG. 4 is a diagram schematically showing the action of a heat conductive member in the light source device of the present invention.

[Explanation of symbols]

 10 Image Recording Device 12 Device Main Body 18 Film Scanning Unit 19 Monitor 38 Exposure Section 40 Exposure Device 42 Switchback Section 46 Water Application Section 58 Heat Development Transfer Section 80 Bonding Roller 82 Heating Drum 90, 92 Peeling Claw 96 Endless Belt 134, 162 Light source 152 Zoom lens 156 Moving mirror 158 Imaging lens 160 Line sensor 164 Slit 168 IR (infrared absorption) filter 174C Cyan filter 174M Magenta filter 174Y Yellow filter 176,186 Driving device 184 Variable aperture 188 Scan table 200 Heat-resistant glass 202 Condensing lens A photothermographic material B image receiving material

Claims (2)

[Claims] 1. A light source device for irradiating the original with light for image recording or reading, which is used in an apparatus for image recording or image reading by forming transmitted light or reflected light of the original on an image receiving element. A light source, an infrared absorption filter arranged between the light source and the original, and a light-transmitting heat conductive member made of a material different from the infrared filter arranged in contact with the infrared absorption filter. A light source device having. 2. The light source device according to claim 1, wherein the heat conductive member is arranged closer to the light source than the infrared filter.