JPH06230481A - Image exposure device - Google Patents

Abstract

PURPOSE:To erase a dot without changing the size of a copied image in the case of copying the dot picture of printed matter, and to realize the same dot erasing effect without depending on variable power rate in the case of copying the image by variable power by setting the defocusing amount of a focus and adjusting the positions of an image-formation lens and a conjugate length adjusting means so that the focus is defocused. CONSTITUTION:In an image exposure device by slit scanning where a fixed focus image-formation lens 25 is used; the focus is defocused by calculating each optical path length in a state where the focal distance of the lens 25 is not set to (f) but set to f+ DELTAf which is different by DELTAf in the case of copying the image by erasing the dot. Namely, the optical path length and the conjugate length to the lens 25 from an original G are given as shown by figure (b). Provided (m) means the variable power rate. A CPU calculates the optical path length of reflected light in such a way and transmits it to each moving means. The variable power rate of the copied image is decided according to the ratio of a distance from the original G to the lens 25 to a distance from the lens 25 to an image surface, so that only the focus is defocused without changing the variable power rate.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a copying apparatus, a printer,
An image exposure apparatus having a variable magnification mechanism used in an image recording apparatus such as a printing plate control apparatus, which can obtain an output image without a halftone dot when a halftone image of a printed matter or the like is used as a document. Regarding

[0002]

2. Description of the Related Art Conventionally, an image recording apparatus such as a copying machine, a printer or a printing plate making apparatus, which exposes and records an original image on a recording material such as a photosensitive material to obtain a reproduced image as a hard copy, has been used. In such an image recording apparatus, the slit scanning exposure type image exposure apparatus is often used because the exposure optical system can be downsized and inexpensive even when the size of the reproduced image is large. In this slit scanning exposure type image exposure apparatus, by moving the scanner, which emits the reading light extending in the one-dimensional direction, in a direction substantially orthogonal to the one-dimensional direction,
A document placed at a predetermined position on the document table is two-dimensionally scanned by the reading light, and reflected light from the document is imaged at a predetermined position on a recording material such as a photosensitive material by an imaging lens. .

Further, in an image recording apparatus using such an image exposure apparatus, not only the original image is reproduced as it is at the same magnification, but also the original image is enlarged to obtain a large-sized reproduced image or reduce it. It has a variable magnification function to obtain a small size reproduced image. Such a zoom function is capable of moving along the optical path of the reflected light from the document to the recording material along this optical path, and at the same time, the focal length of the zoom lens can be changed without changing the optical path length of the reflected light. A variable power mechanism that uses an imaging lens composed of, a fixed-focus imaging lens that can move on the optical path of reflected light, and a conjugate length mirror that can change the optical path length (conjugate length) from the document to the recording material. A variable power mechanism using is known.

In these variable power mechanisms, variable power exposure (recording) is performed.
At this time, the optical path length (distance) between the original and the imaging lens and the optical path length between the imaging lens and the image plane on the recording material are changed according to the magnification change ratio. Although the focal length is changed to make the overall optical path length invariable, in the latter case, since the focal length of the imaging lens is constant, it is necessary to adjust the overall optical path length by using the conjugate length adjusting means.

FIG. 3 conceptually shows an example in which, of the slit scanning image exposure apparatuses equipped with such a variable power mechanism, an image exposure apparatus using a fixed focus imaging lens is used in a copying machine. The image exposure apparatus 200 shown in FIG. 3 basically includes a scanning unit (scanner) 202 which is a scanning element.
A mirror unit 204, a lens unit 206 including an imaging lens 205, and a conjugate length adjusting unit 208 including a conjugate length mirror 207. In such an image exposure apparatus 200, the image of the document G placed at a predetermined position on the document table 212 is irradiated by a light source in the scanning unit 202 while moving and scanning the scanning unit 202, and the reflected light is reflected by a lens. Imaging lens 2 of unit 206
By forming an image on the photosensitive material A that moves in synchronization with the scanning unit 202 by 05, the photosensitive material A is exposed by slit scanning exposure and is reproduced.

Here, in the image exposure apparatus 200 using the fixed-focus imaging lens 205, the image copying by the variable magnification is performed by moving the lens unit 206 in the direction of arrow a along the optical axis of the reflected light L. Imaging lens 20 from G
The adjustment of the optical path length of the reflected light L up to 5 and the adjustment of the total optical path length (conjugate length) of the reflected light L by moving the conjugate length adjusting unit 208 in the direction of the arrow a, and the scanning unit 202 or the photosensitive material A or the same. This is done by adjusting both moving speeds.

That is, by adjusting the ratio of the optical path length from the original G to the imaging lens 205 and the optical path length from the imaging lens 205 to the photosensitive surface (image surface) of the photosensitive material A, the reflected light L is exposed. By adjusting the image forming magnification on the material A and changing the scanning speed of the original by the scanning unit 202 and the scanning speed of the photosensitive material A by the reflected light L relatively, image copying by variable magnification is realized. . That is, in the image exposure apparatus using the fixed focus image forming lens as shown in FIG. 3, the image forming lens 205 (lens unit 206) and the conjugate length mirror 207 are moved by a predetermined moving amount in accordance with the magnification change when changing the magnification. The (conjugate length adjustment unit 208) is moved.

[0008]

A wide variety of originals are used as the originals of such an image exposure apparatus, and various printed matters are one of the frequently used originals. As is well known, many printed materials are halftone dot images that represent characters and images with many small dots. When this image is faithfully reproduced using this as an original, the obtained image is naturally also a halftone dot image. Become. However, when a halftone image is copied by the image exposure apparatus as described above, so-called moire or the like in which streaky unevenness occurs in the copied image occurs, and a high quality image (hard copy) may not be obtained. Therefore, when copying a halftone image, it is desired to record a copied image with halftone erased.

In such an image exposure apparatus, when a halftone image is used as a document, a method of erasing halftone dots of a copied image is intentionally changed by moving the optical path length adjusting unit or the image forming lens described above. There is known a method in which the optical path length is adjusted so as to be different from the focal length and the image exposure is performed in a so-called out-of-focus state. However, when the image exposure is performed by using this method with halftone dots erased, the image formation magnification of the image also changes due to the focus shift, and a copy image of a desired size cannot be obtained.

Further, in the fixed-focus image exposure apparatus shown in FIG. 3, when the image is copied with a variable magnification, the depth of focus of the optical system itself changes, so that the copy image corresponding to the defocused amount is displayed. The amount of blurring of the focus changes, resulting in a copied image having a different halftone elimination effect for each magnification.

An object of the present invention is to solve the above-mentioned problems of the prior art. In an image exposure apparatus utilizing slit scanning exposure, halftone dot erasing when copying a halftone dot image of a printed matter or the like is copied. To provide an image exposure apparatus that can be performed without changing the size of an image and can realize the same halftone dot erasing effect regardless of the scaling factor when copying an image by scaling (enlarging / reducing). It is in.

[0012]

In order to achieve the above object, a first aspect of the present invention is to provide an imaging lens movable along an optical path of reflected light of an original and an optical path length of the reflected light. An image exposure apparatus capable of variable-magnification recording having a conjugate length adjusting means for changing, wherein means for setting a blur amount of a reflected light image for proper image formation by the imaging lens on an output image surface, and the setting Adjusting means for adjusting the positions of the imaging lens and the conjugate length adjusting means so as to blur the reflected light image by a set amount without changing the magnification of the reflected light image with respect to the blur amount. An image exposure apparatus is provided.

Further, in the image exposure apparatus according to the first aspect of the present invention, the adjusting means has a constant blur amount when the blur amount of the reflected light image on the output image surface is converted into an original. Thus, it is preferable to adjust the positions of the imaging lens and the conjugate length adjusting means.

Further, in the image exposure apparatus according to the first aspect of the present invention, the adjusting means adjusts the imaging lens and the conjugate length so that the blur amount of the reflected light image on the output image surface becomes constant. It is preferable to adjust the position of the adjusting means.

Further, the second aspect of the present invention is a variable magnification recording having an imaging lens movable along the optical path of the reflected light of the document and a conjugate length adjusting means for changing the optical path length of the reflected light. An image exposure apparatus capable of setting a blur amount of a reflected light image for proper image formation by the image forming lens on an output image surface, and changing the recording with respect to the set blur amount. Adjusting means for adjusting the positions of the imaging lens and conjugate length adjusting means so as to blur the reflected light image by a set amount without changing the magnification, and the adjusting means,
The positions of the imaging lens and the conjugate length adjusting means are adjusted so that the blur amount when the blur amount of the reflected light image on the output image surface is converted into a document becomes constant, or on the output image surface. The image exposure apparatus is provided with means for selecting whether or not to adjust the positions of the imaging lens and the conjugate length adjusting means so that the blur amount of the reflected light image in is constant.

[0016]

The present invention relates to an image exposure apparatus by slit scanning using an imaging lens with a fixed focus, and a reflection for proper image formation by the imaging lens on an output image surface (that is, a photosensitive material). A means for setting the amount of blur of the light image, that is, a means for setting the amount of blur of the reflected light image formed on the photosensitive material, and the size (magnification) of the copy image with respect to the set amount of blur of the focus. Without changing, blurring the image formed on the photosensitive material by the set amount,
That is, it has means for adjusting the positions of the imaging lens and the conjugate length adjusting means so as to defocus by the set amount.

As described above, when copying a halftone image,
As a method of erasing halftone dots from a copied image to obtain a moire-free copied image, there is known a method of intentionally shifting the focus to form reflected light of an original on a photosensitive material in a so-called out-of-focus state. In this method, the image formation magnification of the reflected light changes depending on the amount of focus deviation, and the size of the copied image becomes incorrect. Further, in the case of image copying with a magnification change, the amount of focus blur on the actual copy image with respect to the set amount of focus blur changes, and the copy image has different halftone dot elimination effects for each magnification. There is also a problem that ends up.

On the other hand, in the image exposure apparatus of the present invention, when copying the halftone image as described above, the means for setting the amount of blurring of the focus, and the amount of blurring of the focus that has been set, And a means for adjusting the positions of the imaging lens and the conjugate length adjusting means so as to defocus by a set amount without changing the magnification. Therefore, according to the image exposure apparatus of the present invention, the blur amount of the focus is arbitrarily set according to the halftone dot density of the original document and the magnification of the copy image, and according to the set value of the blur amount. By adjusting the positions of the image forming lens and the conjugate length adjusting means by adjusting the distance from the original to the image forming lens and the distance from the image forming lens to the image surface (photosensitive material), the copy image (reflected light image By adjusting the amount of blur in () to a set amount, it is possible to obtain a high-quality copy image with good elimination of halftone dots and to set the size (magnification) of the copy image to a predetermined size. it can.

[0019]

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

FIG. 1 is a diagram conceptually showing one embodiment of the image exposure apparatus of the present invention. As shown in the figure, the image exposure device 10 (hereinafter referred to as the exposure device 10) has a scanning unit 18 for scanning the original G, and mirrors 20 and 22, and is half the scanning speed of the scanning unit 18. A mirror unit 24 that moves in the same direction at a speed, a lens unit 26 that includes an imaging lens 25 that accurately forms an image of the reflected light L on the photosensitive material A, and a zoom unit or an image copy with halftone dots erased. A conjugate length adjusting unit 32 that adjusts the optical path length (conjugate length) of the reflected light L, a reflecting mirror 34 that directs the reflected light L onto the photosensitive material A, a moving device 36 of the lens unit 26, and a conjugate length adjusting unit 32. The moving amount of the moving device 38, the lens unit 26, and the conjugate length adjusting unit 32 are calculated,
It has an arithmetic processing unit (CPU) 40 for inputting to each of the moving devices 36 and 38, and an operation panel 42 having a scaling key, the number of copies, a start key for starting copying, and the like. Further, although not shown, the exposure apparatus 10 has a moving unit for the scanning unit 18 and the mirror unit 24, and a sub-scanning conveying unit for the photosensitive material A.

Further, when the halftone image of a printed matter or the like is copied as the original G, the exposure apparatus 10 of the illustrated example is exposed to the proper image formation by the image forming lens 25 on the photosensitive material A which is the image surface. By eliminating the reflected light image of the original on the material, that is, by defocusing the reflected light image on the photosensitive material A, the halftone dots are erased from the copied image formed on the photosensitive material A (hereinafter, referred to as the halftone dot). The operation panel 42 is a device having a function capable of performing image copying by erasing, and the operation panel 42 also serves as a unit for setting an image copying instruction by halftone erasing and a focus blur amount at that time.
Reference numeral 42 calculates the amount of movement of the lens unit 26 and conjugate length adjustment unit 32 according to the set blur amount (and magnification), and drives the moving devices 36 and 38.

In the exposure apparatus 10 of the present invention, the original G is placed at a predetermined position on an original plate (platen) 12 made of a transparent glass plate or the like with the image surface of the original facing downward, and fixed by a platen cover (not shown) or the like. And is scanned by (light from) the scanning unit 18. The scanning unit 18 reflects the light source 14 that illuminates the document G placed on the document table 12, a slit (not shown) that regulates the width of the reflected light L from the document G, and the reflected light L that has passed through this slit. And a mirror 16.

The light source 14 of the scanning unit 18 is a rod-shaped light source extending in a one-dimensional direction (direction perpendicular to the plane of the drawing),
The reading light emitted by the light source 14 and reflected by the document G becomes a slit-shaped reflected light L having a predetermined width by a slit (not shown) and enters the mirror 16 directly below. Here, the scanning unit 18 two-dimensionally scans the document G by moving at a predetermined scanning speed in the direction of an arrow a in the drawing, which is substantially orthogonal to the direction in which the slit extends. The reflected light L incident on the mirror 16 is directed to the mirror 20 of the mirror unit 24.

The mirror unit 24 includes mirrors 20 and 2 for reflecting the reflected light L in parallel with the document placement surface of the document table 12.
2 has a light beam that enters the mirror unit 24.
0 and 22 and reflected in the direction of arrow a (document table 1
The optical path L of the reflected light is formed in a direction (parallel to 2) and directed to the imaging lens 25 of the lens unit 26. Here, the mirror unit 24 moves in the same direction at a speed half the scanning speed of the scanning unit 18, and the optical path length from the original G to the imaging lens 25 of the lens unit 26 during scanning and reading of the original by the scanning unit 18. Is immutable.

The lens unit 26 is constructed by combining a diaphragm, a color filter and the like in addition to the image forming lens 25, and forms an image of the reflected light L on the photosensitive material A at a predetermined magnification. The color and density of the reflected light L are adjusted. Note that this lens unit 26 performs both of them at the same time according to the set blur amount during image copying by halftone erasing and according to the set magnification during variable magnification copying. In accordance with the set blur amount and the scaling ratio, the distance between the image surface of the document G and the imaging lens 25 is changed by moving back and forth along the optical path L (direction of arrow a).
The optical path of the reflected light in the meantime is adjusted or corrected.

Here, the movement of the lens unit 26 at the time of copying an image with halftone dots erased is performed by a moving device 36 including a traveling nut fixed to the lens unit 26 and a drive screw driven by a motor or the like. The movement amount is calculated by the CPU 40 as described later according to the input blur amount and the scaling factor.

Reflected light L that has passed through the lens unit 26
Then enters the conjugate length adjustment unit 32. The conjugate length adjusting unit 32 has two mirrors that respectively reflect the optical path of the reflected light L at a right angle. Like the lens unit 26, the conjugate length adjusting unit 32 moves back and forth along the optical path L during image copying or variable-magnification copying with halftone dot elimination, and the total optical path length of the reflected light L, Therefore, the distance from the imaging lens 25 to the image plane of the photosensitive material A is adjusted or corrected. The position (moving amount) of the conjugate length adjusting unit 32 is calculated by the CPU according to the set blur amount and the scaling factor, and is moved by the moving device 38 by the calculated moving amount.

The reflected light L reflected in a predetermined direction by the conjugate length adjusting unit 32 is then reflected downward by the reflection mirror 34 and forms an image at a predetermined exposure position on the photosensitive material A. Here, since the photosensitive material A is transported at a predetermined scanning transport speed by a transporting means (not shown) in synchronization with the movement of the scanning unit 18 (scanning of the reading light), the photosensitive material A consequently has a slit shape. Two-dimensional scanning is performed by the reflected light L, and the image of the document G is subjected to slit scanning exposure.

The arithmetic processing unit (CPU) 40, when copying an image by halftone erasing and / or copying an image by scaling, changes the lens unit 26 (imaging lens 25) and the lens unit 26 (imaging lens 25) according to the set blur amount and scaling factor. Conjugate length adjustment unit 3
2 calculates the movement amount of the conjugate length mirrors 28 and 30,
To mobile devices 36 and 38, respectively.

When the CPU 40 is connected to a memory for storing a table of the movement amounts of both units 26 and 32 according to the amount of blur and the magnification, the CPU 40 uses the lens unit when copying an image by erasing halftone dots. 26 and the movement amount of the conjugate length adjustment unit 32 are read from the memory 40, and interpolation or the like is performed as necessary (for example, when the movement amount according to the required scaling factor is not stored, interpolation is performed from a close value). It is also possible to calculate the accurate movement amount of both units 26 and 32 according to the set blur amount and the magnification change ratio. Further, when the memory stores the relational expression of the set blur amount or the scaling factor and the movement amount of both units 26 and 32, the CPU 40 uses the relational expression stored in the memory and follows the required program. An accurate amount of movement may be calculated according to the scaling factor.

Both units 26 and 3 thus obtained
The movement amount of 2 is calculated by the CPU 40 from the movement devices 36 and 3
8 is transmitted to the control unit 8 and the moving devices 36 and 38 are moved to the lens unit 26 according to the moving amount data.
Then, the conjugate length adjusting unit 32 is moved by a predetermined amount, and the imaging lens 25 and the conjugate length mirrors 28 and 30 are moved.
Stop at the position according to the set magnification. Thus, the distance from the document G to the imaging lens 25 (optical path length) and the distance from the imaging lens 25 to the image surface of the photosensitive material A (optical path length) depend on the set blur amount and the set magnification. It becomes the optical path length, and accurate image copying is possible.

Here, when the halftone image of a printed matter or the like is copied, the exposure apparatus 10 of the illustrated example intentionally forms the reflected light L on the photosensitive material A in an out-of-focus state to form a halftone dot. It is a device that can form a copied image without erased moire.
In the conventional exposure apparatus, when the image is copied by such halftone erasing, the image is exposed by simply shifting the focus.
As described above, the size of the copied image varies depending on the amount of out-of-focus. On the other hand, in the exposure apparatus 10 according to the present invention, the amount of defocusing is arbitrarily set according to the type of halftone image by the operation panel 42, and the imaging lens 25 and By adjusting the position of the conjugate length adjusting unit 32, the distance from the document G to the imaging lens 25 and the distance from the imaging lens 25 to the photosensitive material A are adjusted, and the blur amount of the copied image is adjusted to the set amount. In addition, the size of the copied image can be set to a predetermined size.

There is no particular limitation on the method of determining the amount of blurring, and the halftone dot density of the original image (5 lines / mm, 10 lines / mm
Etc.) and the scaling factor of the copied image, etc. For example, if you copy a document of 5 lines / mm at a magnification of 200%, the copied image will be 2.5 lines / mm, and if you copy at a magnification of 50%, the copy image will be 10 lines / mm. The amount of blurring at which the halftone dots of the copied image disappear well may be selected as appropriate.

As described above, such an imaging lens 25
The CPU 40 sets the position of the conjugate length adjustment unit 32, that is, the movement amount of the lens unit 26 and the conjugate length adjustment unit 32 by the moving means 36 and 38 is calculated.
The following method is specifically exemplified.

As described above, in the exposure apparatus 10 having the magnification changing function, the lens unit 26 and the conjugate length adjusting unit 32 are moved (positions are adjusted) in accordance with the set magnification and the original G is combined. The distance to the image lens 25 and the conjugate length are adjusted. These movement amounts are calculated (or set and stored in a table) by the CPU 40 according to the focal length of the imaging lens 25 used, but in the exposure apparatus 10, when the image is copied by halftone erasing. Depending on the set blur amount, it is considered that an imaging lens having a focal length different from that of the imaging lens 25 is used, and the movement amounts of both units are calculated.

That is, as shown in FIG.
When the focal length of the imaging lens 25 is f, the magnification change m
The optical path length from the document G to the imaging lens 25 when performing the image copying is given by the following formula [1+ (1 / m)] × f 2, while the optical path from the document G to the photosensitive material A (image surface) The length, that is, the conjugate length is given by the following formula [(1 + m) ² / m] × f.

Here, in the above-described method, when copying an image by halftone dot elimination, the focal length of the imaging lens 25 is not f but "f + Δf" which is different only by Δf, and each optical path length is calculated and focused. Blur. That is, as shown in FIG. 2B, when copying an image by halftone dot elimination, the optical path length from the document G to the imaging lens 25 is calculated by [1+ (1 / m)] × (f + Δf). The conjugate length is calculated as [(1 + m) ² / m] × (f + Δf). In this way, the CPU 40 calculates the optical path length of the reflected light L, further calculates the amount of movement of the lens unit 26 and the conjugate length adjusting unit 32 in accordance with the optical path length, and transmits it to each moving means.

The scaling ratio of the copy image in the exposure apparatus 10 as described above is the distance from the document G to the imaging lens 25,
It is determined by the ratio with the distance from the imaging lens 25 to the image surface (photosensitive material A). Therefore, according to the above method of giving Δf to the focal length f of the imaging lens 25, the entire conjugate length can be adjusted without changing the optical path ratio, so that the size (magnification) of the copied image is changed. Without doing so, it is possible to obtain a copied image in which halftone dots are erased by blurring only the focus. Further, the blur amount can be adjusted to a predetermined amount by appropriately setting Δf.

Further, by adding the following method, it is possible to more accurately adjust and control the amount of out-of-focus, and it is easier and more stable regardless of the mesh density of the document and the scaling factor. It is possible to realize excellent halftone dot elimination of a copied image.

That is, FIG. 2 in which the focal length f is given by Δf
In the example shown in (b), the blur amount δ on the surface of the photosensitive material A is calculated by the following equation from the image formation equation. δ = [(1 + m) / F] × Δf [F: Brightness of lens] Therefore, Δf can be calculated by the following formula 1. Δf = [F / (1 + m)] × δ (Formula 1) By calculating Δf by keeping δ constant according to Expression 1 (or by having such an adjustment table), the blur amount of the image in the copy image is controlled to be constant (or the blur amount on the surface of the photosensitive material A). It is possible to realize halftone dot image copying (by setting δ).

Further, the blur amount of the document (the blur amount when the blur amount of the image actually obtained at the time of copying by scaling is converted to 100% of the scaling factor, that is, the blur amount when converted to the document)
δ ′ can be obtained by δ ′ = δ / m because the blur amount δ of the actual copy image can be divided by the scaling factor. Therefore, Δf at this time can be calculated by the following Expression 2. Δf = [(mF) / (1 + m)] × δ ′ (Equation 2) That is, in the CPU 40, according to Equation 2 above, δ ′
By calculating Δf with constant (or having such an adjustment table), halftone dot-erasing image copying in which the amount of blurring of the original document is constant, that is, the copy image is actually obtained, regardless of the scaling factor It is possible to realize halftone-erased image copying in which the ratio of blurring of the generated image is controlled to be constant (or the blur amount δ ′ of the original G is set).

Further, in the exposure apparatus of the present invention, the halftone-erasing image copying to be carried out is not limited to either one, and the halftone-erasing image copying in which the blur amount of the copied image is constant. , And the function of copying halftone images with a fixed amount of blur of the original, and any halftone function may be selectable according to the application of the copy image to be formed. .

Although the image exposure apparatus of the present invention has been described above in detail, the present invention is not limited to the above-described embodiments, and various improvements and changes may be made without departing from the gist of the present invention. .

[0044]

As described in detail above, according to the image exposure apparatus of the present invention, the amount of defocusing can be arbitrarily set according to the kind of halftone image and the magnification of the copy image, and the predetermined amount can be set. It is possible to obtain a high-quality copied image with good erasing of halftone dots and no moire at the image size.

[Brief description of drawings]

FIG. 1 is a diagram conceptually showing an example of an image exposure apparatus of the present invention.

FIG. 2 is a conceptual diagram for explaining an example of halftone erasing of a copied image by the image exposure apparatus of the present invention.

FIG. 3 is a diagram conceptually showing a conventional image exposure apparatus.

[Explanation of symbols]

 10 image exposure device 12 document table 14 light source 16, 20, 22, 34 mirror 18 scanning unit 24 mirror unit 25 imaging lens 26 lens unit 28, 30 conjugate length mirror 32 conjugate length adjusting unit 36, 38 moving device 40 arithmetic processing unit (CPU) 42 Operation panel A Photosensitive material G Original L Reflected light

Claims (4)

[Claims] 1. An image exposure apparatus capable of variable magnification recording, comprising an imaging lens movable along an optical path of reflected light of an original, and conjugate length adjusting means for changing the optical path length of the reflected light. Means for setting the blur amount of the reflected light image for proper image formation by the imaging lens on the output image surface, and the reflected light image without changing the magnification of the reflected light image with respect to the set blur amount. And an adjusting unit that adjusts the positions of the imaging lens and the conjugate length adjusting unit so as to blur the set amount. 2. The adjusting means adjusts the positions of the imaging lens and the conjugate length adjusting means so that the blur amount when the blur amount of the reflected light image on the output image surface is converted into an original becomes constant. The image exposure apparatus according to claim 1, which is adjusted. 3. The image according to claim 1, wherein the adjusting means adjusts the positions of the imaging lens and the conjugate length adjusting means so that the blur amount of the reflected light image on the output image surface becomes constant. Exposure equipment. 4. An image exposure apparatus capable of variable magnification recording, comprising an imaging lens movable along an optical path of reflected light of an original, and conjugate length adjusting means for changing an optical path length of the reflected light, Means for setting the blur amount of the reflected light image for proper image formation by the imaging lens on the output image surface, and the reflected light without changing the magnification of the recording with respect to the set blur amount. Adjusting means for adjusting the positions of the imaging lens and the conjugate length adjusting means so as to blur the image by a set amount; and when the adjusting means converts the blur amount of the reflected light image on the output image surface into a document. The positions of the imaging lens and the conjugate length adjusting means are adjusted so that the amount of blur of the image is constant, or the amount of blur of the reflected light image on the output image surface is constant. Conjugate length adjustment means Image exposure apparatus characterized by comprising means for selecting whether to adjust the position.