JPS5969745A - Projecting device - Google Patents

Abstract

PURPOSE:To simplify the constitution of a titled device and also to make it small-sized by providing in one body lens array optical systems for unimagnified image projection and variable power image projection so as to be freely rotatable, and constituting so that one of them is positioned seletively on an optical path and executes a projection. CONSTITUTION:An original placing plate 11 is moved in the direction as indicated with an arrow (b) in a state that an unmagnified image projecting lens array optical system 13 is positioned on an optical path prescribed in advance between the original placing plate 11 and a photosensitive drum 12, also the photosensitive drum 12 is rotated in the direction as indicated with an arrow (a), and when an original on the original platen 11 is illuminated by an illuminating lamp 21 and a reflector 22, an unmagnified image can be projected onto the photosensitive drum 12. When a holding plate 16 is half-rotated in the direction as indicated with an arrow (c) centering around a revolving shaft 15 from this state, a reduced image projecting lens array optical system 14 is positioned on the optical path 17, therefore, in this state, a reduced image of the original can be projected on the photosensitive drum 12.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a projection device capable of selectively projecting a constant-magnification image and a variable-magnification image.

Such a projection device is applied, for example, to an electrophotographic copying machine, but such conventional copying machines capable of full-size copying and variable-magnification copying are larger and more complex than copying machines that can only perform full-size copying. There are drawbacks to doing so.

A projection device applied to a copying machine will be briefly described below.

FIG. 1A shows a principle diagram of a scanning exposure device for document images using a conventionally known spherical lens, in which a document on a document table 1 made of glass or the like is illuminated by an illuminating device 2 in the width direction of the document. A projection lens 8 consisting of a spherical lens projects an image of a band-shaped area extending over the area.
The image is projected onto a drum-shaped or belt-shaped photoreceptor 4 rotating in the direction of arrow a for exposure. in this case,
For scanning exposure of the original, the illumination device 2 and the projection lens 8 are fixed and the document table 1 is moved in the direction of the arrow, or the photoreceptor 4 is made flat like a belt, the document table 1 is fixed and the projection lens 8 is moved. This can be done by moving the mirror in the direction of arrow C, or by arranging a scanning mirror and moving it and the projection lens.

FIG. 1B shows an exposure device that selectively projects a full-sized image and a reduced image. In this exposure apparatus, when projecting a same-magnification image, the mirrors 5, 6.7 and the in-mirror type projection lens 8 are arranged at the positions shown by solid lines,
When projecting a reduced image, the mirror 6 and the in-mirror type projection lens 8 are moved to the positions shown by the broken lines to lengthen the optical path length from the projection lens 8 to the document table 1, and to The optical path length to the body 4 is shortened. In addition, for scanning exposure of an original, the optical system is fixed to the photoconductor 4 rotating in the direction of arrow a, and the original table l is moved in the direction of the arrow. Alternatively, the original table 1 is fixed and the mirrors 5 and 6 are This is done by moving in the direction of arrow C so that the optical path length up to the projection lens 8 is constant. In this way, when the projection lens 8 is used for projecting a same-magnification image and a variable-magnification image, it is necessary to arrange the projection lens 8 and the reflecting mirror 6 movably, and maintain high precision in their positioning. It is difficult to do so, and the device is large and complicated.

FIG. 1C shows another example of an exposure device that projects a same-magnification image, and is known as a SELFOC lens array (product name: manufactured by Nippon Sheet Glass Co., Ltd.) between an original table l and a photoreceptor 4. A lens array 9 is arranged, such as a gradient index rod lens array, or a microlens array, which is an array of an erect orthogonal image projection lens system constructed by combining two stages of small-diameter spherical lenses. If such a lens array 9 is used, the optical device can be significantly downsized and simplified. For example, when using a cell 7 lens array, the distance between the document table 1 and the photoreceptor 4 can be set between 50 and 80 mm. I can do it.

The above has explained the projection device applied to copying machines, but as is clear from the above explanation, in order to make the exposure device smaller and simpler, it is necessary to use a cell 7 lens array or micro It is preferable to use a lens array such as a lens array. However, such a lens array uses a plurality of erect orthogonal image projection lens systems in parallel to form a projection image with a wide field width that cannot be covered by a single lens system. A good projected image can be obtained by overlapping the images projected by the lens system without any deviation, but when projecting a variable magnification image such as a reduced or enlarged image, simply changing the object distance and image distance will cause the difference between each projected image. Since the overlapping of the images is shifted and a good projected image cannot be obtained, it was used exclusively for the purpose of projecting a life-sized image.

FIGS. 2A and 2B show how a projected image is formed by such a lens array.

Figure 2A shows the same magnification erect orthogonal image projection lens system La, LbL.
The image forming situation is shown when the optical axes of the lenses x, x' are the optical axes of the projection lens system La, and y, y' are the projection lens systems. The optical axes of each are shown. 0□ is a document whose leading edge and trailing edge are in contact with the optical axes X and y. ■□ is the original O□ by the projection lens system La
The leading edge of the original O□, which is located at least on the optical axis X in the projected image, is located on the optical axis The rear end of 0□ is also on the optical axis y' in the projection imager □. Projection lens system. Since the rear end of the original O0 is in contact with the optical axis y', the projection imager □' is a projection imager, since the rear end of the original O0 is in contact with the optical axis y', and since it is a same-size image, the leading edge of the original O is tangent to the optical axis X'. In other words, since the projection images ′ and □ are formed at the same position, they are recognized as a single image even if they are superimposed.
On the other hand, Figure 2B shows a situation when a reduced image is projected using a similar lens array, but in this case, the original 0□ is
Compared to Figure A, the projection lens systems La, L.

The image plane is located at a position farther from the document-side end surface of the projection lens system La, Lo, and the image plane is formed closer to the projection image-side end surface of the projection lens system La, Lo. The tip of the original O8 that is in contact with the optical axis X is the optical axis X in the projection image processing 2 using the projection lens system La.
' and the rear end of the original 02, which is in contact with the optical axis y, is the projection lens thread. The projection imager, ′, is also tangent to the optical axis y′. However, since the image projection magnification is a reduced image of 1 or less, the projected images I, , I,' by the projection lens system LaLo do not overlap as shown, and a normal reduced image is not formed. Such a problem similarly occurs when an enlarged projected image of an erect normal image is obtained.

In this way, when using a lens array in which a plurality of erect orthogonal image projection lens systems that cannot cover the maximum document width by themselves are arranged in parallel so that their optical axes are parallel to each other,
Even if a same-size orthogonal image can be formed normally, a variable-magnification erect orthogonal image cannot be formed normally. For this reason, a variable magnification optical image projection device has conventionally been constructed using a set of spherical lenses that cover the entire screen, but this device has the drawbacks of being complicated in construction and large in size.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned drawbacks and to provide a projection device that is appropriately constructed and arranged so that it can selectively project a same-magnification image and a variable-magnification image with a simple and compact configuration.

The projection device of the present invention includes a lens array optical system for projecting a 1-magnification image of an object on the object surface onto the receiving surface between a predetermined object plane and an image-receiving surface, and a variable-magnification image projection system. A lens array for projecting a variable magnification image to be projected is rotatably provided, and by rotating these, one of the lens array optical systems is positioned on a predetermined optical path. The present invention is characterized in that it is configured to be able to selectively project a variable magnification image and a variable magnification image.

The present invention will be described in detail below with reference to the drawings.

8A, B, and C are diagrams for explaining the principle of the lens array optical system for variable magnification image projection used in the projection device of the present invention, and La and Lo are erect normal images similar to those in FIG. 2. A projection lens system is shown, with its respective optical axis designated x, x' and y, y'. p and p' are light beam deflection elements,
In the illustrated example, a prism is used. These prisms p
, p' is the projection lens system.

is placed close to the end face of the lens, and acts to tilt the optical axis at a predetermined angle. 0. indicates a document, the leading and trailing ends of which are in contact with the optical axes X and y, respectively.

In FIG. 8A, prisms p and p' are used as a projection lens system. are placed close to each end face of the

Here, the projection image processing of the original 02 by the projection lens system La is performed.
has its tip in contact with the optical axis X', and its length is determined by the projection reduction ratio. Also, the rear end of the document O3 is a projection lens system. This projection lens system is tangent to the optical axis y. The rear end of the projection imager 2' is in contact with the optical axis y', and its length is the same as that of the projection imager formed by the projection lens system La. Therefore prisms p, p'
Select the angle or refractive index of each projection imager 2 and 2
′ are set so that they overlap completely □, a normal reduced projection image without any shift in image weight can be obtained.

It should be noted that an enlarged image can be obtained using exactly the same principle if the projection imager 2 in FIG. 3A is considered to be an original and the original 02 is considered to be a projected image.

In Figure 8A, the projection lens system is shown. Although light beam deflection elements p and p' were interposed on both the original disaster side and the projected image side,
The projection lens system is shown in FIGS. 3B and 3C, respectively. Even if the light beam deflecting element p or p' is interposed only on one side of the lens, it is possible to obtain a variable magnification projection image without any shift in image weight, as in FIG. 8A. That is, in FIG. 8B, the projection lens system (Selfoc lens) La, L
The length of o is lengthened by ΔL on the projection image side to create a reduced image, and the light beam of lens Lo (7) is deflected by prism p' to form lens La. The respective reduction image processes and process 2' are superimposed on each other. In addition, in FIG. 8G, as explained in FIG. 1C, the self-occurrence La,
The lengths of I and o are shortened by ΔL at the end on the document side, and the document position is moved away to form a reduced image of the document 08, and a prism p is placed on the document side end surface of the cell 7 cleaning lens L0. Lens L. Byoru projected image 1. It is constructed so that I overlaps the projection imager 8 formed by the lens La.

FIG. 4 is a diagram showing the configuration of an example of a variable magnification image projection lens array optical system used in the projection apparatus of the present invention based on the principle explained in FIG. 8. In FIG. 4, Lal −
----I L, l ----t LnG; [The erecting orthogonal image projection lens systems are arranged in parallel so that their respective optical axes are parallel, and the cell 7 lens array or It constitutes a microlens array L. p,
p' is a light beam deflection plate, and in this example, a prism plate constructed by arranging a large number of prisms is used. The angle of each prism is configured so that the deflection angle increases from the center to the end in order to satisfy the conditions explained in FIG. It is located. 0. indicates the original, ■ indicates the projected image, and
.

'y, z, v, w and x/, y/, z/,
v/, w/ are for each lens system, *IJl+8 +
Optical axes of L/+6 + L and +g + LH are shown.

The distance between the center lens system Ln and the outermost lens system Ln is 11. The optical axis W of Ln is taken relative to the original surface, and the length connecting the point where the optical axis X intersects with the optical axis W is l. , the optical axis W of Ln with respect to the image plane
Let li be the length connecting the points where the optical axis X' and the optical axis X' of L7 intersect, and lo-, 1-1a, ! -11-1b. The projection magnification is li/lo, the inclinations of the optical axis of the outermost lens system Ln are α and β, and the vertical distances from the beam deflectors p and p' to the document surface and the image surface are h and h', respectively. , tanα-ta7h.

tanβ-7b/h'. The smaller α and β are, the easier it is to manufacture the prism, and the occurrence of various aberrations due to bending of the optical axis can be suppressed, which is advantageous. In order to reduce α and β, la and lb may be reduced, or h and h' may be increased. la and lb are the scales at which the enlargement or reduction ratio of the projected image is large, and the document screen width l. As la and IB become larger, it becomes larger, so if la and IB are thick, it is preferable to set the lens system so that b' becomes large as much as possible.

The light beam deflection plates p and p' are a collection of micro prisms,
It can be manufactured commercially by molding optical materials such as plastic, glass, etc. Examples of optical plastic materials that can be used include styrene resin, methyl methacrylate, cyclohexyl methacrylate, and allyl diglycol carbonate, with methyl methacrylate and cyclohexyl methacrylate being particularly superior as materials with little chromatic aberration.

As a molding method, a casting method, a compression molding method, an injection molding method, etc. can be applied. With regard to optical glass, recent technological advances have made it possible to obtain processing accuracy comparable to conventional polishing methods by molding, and there is a track record of commercialization, making it applicable as the above-mentioned light beam deflection plate. As can be understood from the description of FIGS. 8B and 8, the present invention can be carried out using only one of the light beam deflecting plates p and p'. In this case, the angle α or β is approximately twice as large as that shown in FIG.
This method can be suitably put to practical use when h' is long and the values of α and β are small. In addition, for the SELFOC lens array that is in practical use, in which multiple rows of SELFOC lenses are closely packed, in order to correct the deviation of image overlap in the thickness direction of the array, It is preferable to use a 7 renel lens or the like as the light beam deflection plate. In this case, a plurality of SELFOC lenses can be made to correspond to one 7-Lesnel lens.

5A and 5B are diagrams showing the configuration of an example of the projection device of the present invention, which is applied to a playback photocopying machine.

In this example, a lens array optical system 13 for equal-magnification image projection and a lens array optical system 14 for reduced image projection are connected between the document table 11 and the photosensitive drum 12 by half a rotation in forward and reverse directions about a rotation axis 15. By attaching the holding plate 16 parallel to the holding plate 16 so as to sandwich the rotating shaft 16, and rotating the holding plate 16 by half a rotation in the forward and reverse directions about the rotating shaft 16, it is possible to predetermine which one of the lens array optical systems is connected to the other lens array optical system. It is arranged so that it is located in the optical path 17. The lens array optical system 18 for same-magnification image projection includes a lens array 18 such as a conventionally known SELFOC lens array or microlens array, and the lens array optical system 14 for reduced image projection includes the lens array 18 and its both end surfaces. The light beam deflecting plates 19 and 20 are arranged in the same direction. In this example, the rotating wheel 15 is provided on a plane that includes the optical center of the optical path 17 and is orthogonal to the optical path 17. Here, the optical center is the center of the optical path length of the optical path 17, and when an optical member with a refractive index n and a thickness d, such as the document table 11, is interposed in this optical path 17, its equivalent optical path length is nd
However, there is no need to consider the lens array optical system, and this part is regarded as space. Therefore, in this example, the rotation axis 15 is located on a plane perpendicular to the optical axis including the center of each lens length of the lens array 18 for the same-magnification image projection lens 7, and the reduced image For the projection lens array optical system 14, if the light beam deflection plate 19 side is the incident side, the lens array 18
It is located on a plane perpendicular to the optical axis shifted toward the light beam deflection plate 19 from the center of each lens length.

In FIG. 5A, since the same-magnification image projection lens array optical system 18 is located on the optical path 17, in this state, the document table 11 is moved in the direction of the arrow, and the photosensitive drum 12 is rotated in the direction of the arrow a. The illumination lamp 21 and reflector 2
By illuminating an original (not shown) placed on the original platen IJ by means of 2, a life-size image of the original can be projected onto the photosensitive drum 12. Also, from the state shown in FIG. 5A, the rotation shaft 15
If the holding plate 16 is rotated half a turn in the direction shown by the arrow C, the small image projection lens array optical system]4 is located in the optical path 17, as shown in FIG. 5B. A reduced image of the document placed on the document table 11 is transferred to the photosensitive drum 12.
can be projected onto.

In this way, according to this embodiment, both lens array optical system 1
8 and 14 are held on the holding plate 16, and this is attached to the rotation shaft 15.
It is possible to selectively project a full-size image and a reduced image using an extremely simple, compact, and inexpensive configuration in which the image is rotated by half a rotation around the center. In addition, both lens array optical systems 18 and 1
Since the same magnification image and the reduced image are selected by rotating 4 by half a rotation, the amount of movement of the optical system is small, and therefore positioning can be performed easily and with high precision.

As described above, according to the present invention, an extremely small projection device can be realized. However, if the rotation shaft 15 is provided on a plane that includes the optical center of the optical path 17 and is orthogonal to the optical path 17 as in the embodiment described above, the space on the document table 11 side is occupied by a drive for moving the document table 11. A mechanism, an illumination lamp 21, a reflecting mirror 22, etc. are arranged, and the photosensitive drum 1
In the space on the second side, a corona charger for uniformly charging the photosensitive drum 12, a trimming lamp for eliminating the charge on the non-image area on the photosensitive drum 12, etc. are arranged, so the structure of the electrophotographic apparatus is The above-mentioned various members disposed on the upper document table 11 side or the photosensitive drum 12 side may interfere with the rotation spaces of both lens array optical systems 18 and 14.

FIGS. 6A and 6B show an embodiment for solving this problem, and the same reference numerals as those shown in FIGS. 5A and 5B represent components having the same function.

In this example, the rotation axis 15 is moved a distance *d from a plane perpendicular to the optical path 17 including the optical center of the optical path 17 to the photosensitive drum 12 side.
The lens array optical systems 18 and 14 are placed at a shifted position to form a wide space on the document table 11 side that does not interfere with the rotation of both lens array optical systems 18 and 14. , and FIG. 6B respectively show the projection state of the reduced image.

Comparing Fig. 6 A, B with Fig. 5 A, B, the optical path 17
The lens array optical systems located in FIG. . This is because the rotating shaft 15 is moved closer to the photosensitive drum 12 in FIGS. 6A and 6H, and as a result, a wide space can be secured on the document table 11 side. Therefore, in FIGS. 6A and 6B, the reflecting mirror 22
In addition, the illumination lamp 21 can be placed further away from the document table 11, thereby balancing the illumination system and improving the overall illumination efficiency. can.

FIGS. 7A, B and 0 show still other embodiments of the present invention. In this example, a lens array optical system 18 for projecting an equal-magnification image and a lens array optical system 24 for projecting a variable-magnification image are installed between the document table 11 and the photosensitive drum 12 in forward and reverse directions about a rotation axis 15. It is attached in parallel to a holding plate 25 that is semi-rotatable and movable in a direction perpendicular to the rotation axis 15 and a predetermined optical path 17, and selectively projects a life-sized image, a reduced image, and an enlarged image. It is something to do. The variable magnification image projection lens array optical system z4 is constructed of a lens array 18 and light beam deflection plates 19 and 20 disposed on both end surfaces thereof, similar to the above-mentioned reduced image projection lens array optical system 14.

That is, in this example, as shown in FIG. 7A, the same-magnification image is projected onto the photosensitive drum 12 with the same-magnification image projection lens array optical system 18 positioned on the optical path 17. Then, the holding plate 25 is rotated half a turn in the direction shown by the arrow C around the rotation axis 15, and the variable magnification image projection lens array optical system 24 is positioned in the optical path 17 as shown in FIG. 7B. A reduced image is projected onto the drum 12, and from the state shown in FIG. 7A, the holding plate 25 is moved in parallel to the right in the figure to form the variable magnification image projection lens array as shown in FIG. 7C. An enlarged image is projected onto the photosensitive drum 12 with the optical system 24 positioned in the optical path 17. In order to satisfy the imaging condition of selectively projecting an enlarged image and a reduced image by one variable magnification image projection lens array optical system 24, the variable magnification image projection lens array optical system 24 must be connected to the optical path 17. , the distance from each end surface to the document table 11 and the photosensitive drum 12 is the same as when obtaining an enlarged image.
It is necessary to use the opposite combination when obtaining a reduced image. Therefore, in this example, the rotation axis 15 is provided on a plane that includes the optical center of the optical path 17 and is orthogonal to the optical path 17, as in the case of FIGS. 5A and 5B.

In this way, according to this embodiment, both lens array optical system 18
and 24 are held on a holding plate 25, which can be rotated by a half around the rotation axis 15, and which can be moved in a direction perpendicular to the optical path 17.The extremely simple, compact, and inexpensive structure enables the same magnification. Images, reduced images and enlarged images can be selectively projected. Also in this case, since the amount of movement of the optical system is small, positioning can be performed easily and with high precision.

Note that the present invention is not limited to the above-mentioned example, and can be modified or changed in many ways.

For example, in the above-mentioned examples, the two lens array optical systems are rotated half a rotation to selectively obtain the same magnification image and the reduced image. It can also be configured. Furthermore, the two lens array optical systems do not necessarily need to be rotated half a turn; they can be mounted on a holding plate at any angle on a predetermined optical path so that they do not interfere with each other, and rotated at any angle. It can also be configured to be selectively positioned in the optical path. In this way, in addition to the lens array optical system for projecting a constant magnification image, a plurality of lens array optical systems for variable magnification image projection having different magnification ratios can be attached. Furthermore, in the present invention, the lens array optical systems for projecting the same-magnification image and the variable-magnification image are rotated together to selectively position them on a predetermined optical path. It is also possible to position the system on a predetermined optical path by simply shifting the system in parallel, thereby selectively projecting the same-magnification image and the variable-magnification image. Also,
In the embodiment shown in FIG. 7, by rotating the holding plate 25 by half a rotation, the same size image and the reduced image are selected, and by moving the holding plate 25 in parallel, the same size image and the enlarged image are selected. may be the opposite. Furthermore, in FIG. 7, in addition to the lens array optical system for projecting a constant magnification image, a plurality of lens array optical systems for projecting a variable magnification image, for example, two lens array optical systems having different magnification ratios, are installed in parallel, and by half rotation and parallel movement, It is also possible to select five types of projection images: a life-sized image, two types of reduced images, and two types of enlarged images. Furthermore, the light beam deflecting plate may be arranged only on either the incident end side or the outgoing end side of the lens array, and its deflection effect does not occur at one end of the lens array, but from one end to the other. It can also be configured to increase sequentially toward the ends. Furthermore, the lens length can be sequentially shortened on one side or both sides in accordance with the deflection action of the light beam deflection plate, thereby correcting deviations in imaging conditions due to the deflection action. Furthermore, as mentioned above, when a light beam deflection plate is used, its chromatic aberration deteriorates the resolution when reproducing black and white images, and causes color shift when reproducing color images, but this problem can be solved. To solve this problem, the lens array may be provided with chromatic aberration so as to correct the chromatic aberration of the light beam deflection plate. In this case, for example, the lens array may have a light beam deflection plate corresponding to each lens system that constitutes the lens array. If the lens array has a chromatic aberration that corrects the chromatic aberration, or if the light beam deflection plate is configured so that there is no deflection effect at the center of the lens array, but the deflection effect increases sequentially from the center to the edges. All lens systems constituting the lens array have chromatic aberration that corrects the chromatic aberration of the light beam deflection plate corresponding to the lens system located approximately midway between the center and end of the lens array, or The lens array is formed into n groups (n≧2) between its center and end, and a light beam deflection plate is attached to all lens systems in each group, corresponding to the lens system located approximately in the middle of the group. It can be constructed by providing chromatic aberration to correct chromatic aberration. In addition, as a method of imparting chromatic aberration to a lens array in this way, for example, when using a Selfoc lens, the refractive index and Atsube number in the radial direction of the lens are controlled by selecting ions, and when using a microlens, A desired chromatic aberration can be easily provided by controlling the refractive index and Abbe's number of a plurality of lenses constituting one projection optical system.

As described above, in the present invention, by rotating the lens array optical system for equal-magnification image projection and the lens array optical system for variable-magnification image projection, one of the lens array optical systems can be set to a predetermined optical path. Since it selectively projects the same-magnification image and variable-magnification image by positioning the device at Furthermore, positioning can be performed with high precision. In addition, by deviating the rotation #J axis of the lens array optical system for equal-magnification image projection and the lens array optical system for variable-magnification image projection toward the object plane side or the image receiving plane side, it is possible to It is possible to intentionally secure a wide space, thereby making it easy to arrange necessary members. Furthermore, in addition to projecting a 1-magnification image using a 1-magnification image projection lens array optical system, by configuring a variable-magnification image projection lens array optical system to selectively project a reduced image and an enlarged image, etc. A double image, a reduced image, and an enlarged image can be selectively projected using two lens array optical systems, and therefore with a small and simple configuration.

[Brief explanation of the drawing]

Figures 1A to 1G are diagrams showing eight examples of projection devices applied to copying machines, and Figures 2A and B are modes of forming a projected image by a lens array in which a plurality of erect orthogonal image projection lens systems are arranged. Figures 3A, B and C are diagrams for explaining the principle of the variable magnification image projection lens array optical system used in the projection device of the present invention, and Figure 4 is a diagram used in the projection device of the present invention. A diagram showing the configuration of an example of a lens array optical system for variable magnification image projection. It is a line diagram showing a composition. 11... Original table 12... Photosensitive drum 1
8... Lens array optical system for equal-magnification image projection 14... Lens array optical system for reduced image projection 15... Rotation axis
16... Holding plate 17... Light M
1s...Lens array 19, 20 - light beam deflection plate
21...Illumination lamp 22...Reflector 24...Lens array optical system for variable magnification image projection 25...
holding plate. Patent applicant: Olympus Optical Industry Co., Ltd. Figure 8 Figure 5 Figure 1 (Figure A 6 Figure 1

Claims (1)

[Scope of Claims] L A lens array optical system for projecting a 1-magnification image, which projects a 1-magnification image of an object on the object plane onto the image-receiving plane, between a predetermined object plane and an image-receiving plane, and a variable-magnification image projection. A variable magnification image projection lens array optical system and a variable magnification image projection lens array optical system are provided so as to be rotatable, and by rotating these, one of the lens array optical systems is positioned on a predetermined optical path. A projection device characterized in that it is configured to selectively project an image and a variable magnification image. λ The lens array optical system for equal-magnification image projection and the lens array optical system for variable-magnification image projection are provided in parallel with a rotation axis in between, and the rotation axis includes the optical center of the optical path defined by the front handle. A wide space is provided on the image receiving surface side or the object surface side that does not interfere with the rotation of both the lens array optical systems by providing the lens array so as to be rotatable by a half on the object surface side or the image receiving surface side with respect to the plane perpendicular to the optical path. The projection device according to claim 1, characterized in that the projection device is configured to obtain n#. & The lens array optical system for equal-magnification image projection and the lens array optical system for variable-magnification image projection are provided in parallel with the rotation axis in between, and the optical center of the optical path predetermined by the front handle is set at the rotation axis. with a fast rotation iJ function on a plane perpendicular to the optical path including,
and is provided so as to be movable in a direction orthogonal to the rotational axis integrally with both of the lens array optical systems, so that a reduced image and an enlarged image can be selectively projected with one variable magnification image projection lens array optical system. The first claim characterized in that
Projection device described in Section 2.