JPH05241241A - Mobile mechanism for condenser lens, and image forming device - Google Patents

Abstract

PURPOSE:To provide a mobile mechanism for a condenser lens, which, first, finely and sufficiently adjusts absolute illuminance and unevenness in illumination, and when adjusts the illumination without causing its unevenness, even the number of interchangeable projection lenses is increased, for instance, to four kinds, second, further, has an easy operation for the adjustment, and third, is excel lent in cost without making the size of the whole of a device large, and further, an image forming device which can not take an image forming action, when the condenser lens is not at a fixed position, and surely attain the action, operation, etc., of the whole of the device. CONSTITUTION:In the mobile mechanism 19, the lever main body 28 of a lever for movement 24, is rockingly displaced in the first direction of A, to move a concave lens 20 via a first holding member 21, etc., and in the second direction of B, to move a convex lens 22 via a rocking lever 29, a second holding member 23, etc. Moreover, in the image forming device, when it is detected and discriminated that the condenser lens 6 is not at each fixed position, a printing action, etc., can not be taken.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a condenser lens moving mechanism and an image forming apparatus. That is, a microreader for projecting and viewing microfilm images on a screen, a reader printer for further copying,
Further, the present invention relates to a microscanner for making a CCD as a solid-state image pickup device read, other image forming apparatus, and a moving mechanism for a plurality of condenser lenses used in such an image forming apparatus.

[0002]

2. Description of the Related Art In an image forming apparatus such as a reader printer, light from a light source is emitted through a condenser lens group and an image is projected through a projection lens. Then, several kinds of projection lenses with different magnifications can be attached to change the projection magnification, and the adjustment of absolute illuminance and illuminance unevenness according to these projection lenses is performed by adjusting the positions of the condenser lens group and the light source that are the illumination system. It is done by changing relationships. So, in the prior art, first, a method of fixing the light source and integrally enabling the condenser lens group, a method of moving the light source and fixing the condenser lens group, and a part of the condenser lens group (for example, 1 A method in which only one convex lens) is movable and the other part (for example, a concave lens) is fixed, and the like have been adopted. In this way, conventionally, first, a method of manually moving only a part of the illumination system with one moving lever is adopted, and by changing the positional relationship between them,
The absolute illuminance and illuminance unevenness were adjusted according to the projection lens.

On the other hand, recently, not only a part of the illumination system but also a plurality of parts are independently movable, and by moving them to change the positional relationship between them, the absolute illuminance and the illuminance unevenness according to the projection lens are adjusted. The method of doing was also developed. In this method, in order to save the user's adjustment work in consideration of the fact that it is troublesome to move a plurality of parts by using respective moving levers, the convex lens and the concave lens of the condenser lens group are respectively separated. A technology is adopted in which the drive motor can be moved independently, or the plate on which the convex lens and the concave lens are placed can be moved by the drive motor, and the holding member for the convex lens can be moved by another drive motor on the plate. These drive motors were controlled by using a microcomputer.

[0004]

By the way, the following problems have been pointed out in such a conventional example. First, in the former case, that is, in the conventional example in which only a part of the illumination system is moved, it is difficult to finely adjust the absolute illuminance and the illuminance unevenness, and there is a limit, so that the adjustment is insufficient. That is, when the number of replaceable projection lenses is small, for example, about two kinds, the problem is small. However, when the number of replaceable projection lenses is large, for example, four kinds, the image forming point of the light is formed only by moving a part of the illumination system. The amount of light passing through the peripheral portion of the projection lens becomes less than the amount of light passing through the central portion of the image, and the peripheral portion of the image projected on the screen becomes darker, etc. It has been pointed out that uneven illumination is likely to occur.
On the other hand, in the latter case, that is, in the conventional example in which a plurality of parts of the illumination system are independently moved, the absolute illuminance and the illuminance unevenness can be finely and sufficiently adjusted, but the entire device is enlarged. There was also a cost disadvantage. That is, the number of replaceable projection lenses is four, for example.
Even if the number of types increases, it is possible to arrange the concave and convex lenses of the condenser lens at optimum combination positions, for example, four types for each projection lens, and adjust the illuminance without shifting the image forming point from the image principal point of the projection lens. While the absolute illuminance can be satisfied and the illuminance unevenness can be prevented, the size of the entire device is increased due to the need for a space for disposing the drive motor, and an expensive drive motor,
Since a microcomputer or the like is used, it has been pointed out that the cost is large as compared with the method of using a manual moving lever.

In view of such circumstances, the present invention has been made to solve the problems of the above-mentioned conventional example.
First, by using the moving lever that moves the first lens through the first holding member by the displacement in the direction, and moves the second lens through the second holding member by the displacement in the second direction, , The first lens and the second lens can be moved independently of each other, and the illuminance can be adjusted without causing the illuminance unevenness for each projection lens. Secondly, the adjustment operation is simple and easy. It is an object of the present invention to propose a condenser lens moving mechanism that is excellent in cost without increasing the size of the entire apparatus. Further, by providing the detection means and the control means for disabling the image forming operation when the first lens and the second lens are not at the predetermined positions, an image in which the operation, operation, etc. are ensured It is also an object to propose a forming device.

[0006]

[Means for Solving the Problems] Claim 1 is as follows. That is, the condenser lens moving mechanism relates to a plurality of condenser lens moving mechanisms used in an image forming apparatus that projects an image through a projection lens. A first holding member that holds the first lens of the condenser lens and is movable between predetermined positions; and a second holding member that holds the second lens of the condenser lens and is movable between predetermined positions; And a moving lever connected to the first holding member and the second holding member. The moving lever is displaceable in a first direction and a second direction, the displacement in the first direction moves the first holding member, and the displacement in the second direction causes the second holding member to move. Is designed to be moved. Claim 2 is as follows. That is, this image forming apparatus includes a detecting unit that detects the position of the first holding member, the second holding member, the moving lever, or the like in the condenser lens moving mechanism according to claim 1, and the detection result of the detecting unit. And a control unit for disabling the image forming operation when the first lens and the second lens are not at the predetermined positions.

[0007]

In the image forming apparatus, light is emitted through the plurality of condenser lenses and the image is projected through the projection lens. The condenser lens moving mechanism according to claim 1 moves the first lens through the first holding member by displacement in the first direction, and moves the second lens by displacement in the second direction.
A moving lever that moves the second lens via the holding member is used. Therefore, firstly, the absolute illuminance and the illuminance unevenness can be finely and sufficiently adjusted. That is, even when the number of replaceable projection lenses having different magnifications is large, the first lens and the second lens are independently moved to predetermined positions individually by appropriately displacing the moving lever, and the projection lens is projected. The optimum combination position for the lens can be set. Therefore, the illuminance can be adjusted without shifting the image forming point from the image principal point of the projection lens, the absolute illuminance can be satisfied, and the illuminance unevenness can be prevented. Secondly, as described above, the adjustment operation of the absolute illuminance and the illuminance unevenness can be easily and easily performed by one moving lever. Thirdly, since a predetermined moving lever is used and a drive motor, a microcomputer, etc. are not used, the size of the entire apparatus is not increased and the cost is excellent. Further, in the image forming apparatus according to claim 2, when it is further determined that the first lens and the second lens are not in the respective predetermined positions corresponding to the projection lens based on the detection result of the detection means, the control means Since the image forming operation is disabled, the operation and the operation are ensured.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below based on the embodiments shown in the drawings. 7 and 8 show a microfilm reader printer which is an example of an image forming apparatus that projects an image through a projection lens. FIG. 7 is an external perspective view thereof, and FIG. 8 is a perspective explanatory view of its optical system. is there. First, the outline of the reader printer will be described with reference to these drawings.

In this reader printer, a screen box 2 is provided on a housing 1, a work table 3 is horizontally provided on the front surface of the housing 1, and an operation board 4 mounted on the work table 3 is provided. By the key operation of, the frame information of the image to be searched on the microfilm F is commanded. In the illumination system provided in the housing 1, light from a light source 5 such as a lamp is condensed by a plurality of condenser lenses 6 and then reflected by a condenser mirror 7 to be loaded on a film carrier Z. The image directed to the film F and recorded on the microfilm F is irradiated from below to reach the projection lens 8. Therefore, the image of the microfilm F is enlarged and projected by the projection lens 8, and the projection lens 8 can be attached with several different magnifications in order to change the projection magnification. Then, there are four types of the 7.5 × single focus projection lens 8, the 13 × to 27 × zoom projection lens 8, the 9 × to 16 × zoom projection lens 8 and the 20 × to 50 × zoom projection lens 8. Various types are appropriately selected and used in exchange.

The optical system of the reader / printer is of a system in which the reader optical path R and the printer optical path P are switched and selectively used. First, in the reader mode, the reader optical path R is formed as indicated by the one-dot chain line in FIG. That is, the light from the projection lens 8 is reflected to the rear side by the first reader mirror 9 provided in the upper part of the screen box 2, and then further forwarded to the front side by the second reader mirror 10 provided in the rear part. It is reflected and goes toward the screen 11 provided on the front surface of the screen box 2. As a result, the image of the microfilm F is enlarged and projected on the screen 11 for viewing.

Next, in the print mode, the printer optical path P is formed as indicated by the chain double-dashed line in FIG. That is, first, the first printing mirror 12 enters from the retracted position (the position shown by the solid line in the figure) outside the reader optical path R in the reader mode toward the switching position (the position shown by the broken line in the figure) on the back surface of the screen 11. To do. Therefore, the light from the projection lens 8 is reflected to the left side by the first printing mirror 12 at such a switching position, and is reflected to the rear side by the second printing mirror 13 provided on the side portion of the screen box 2. After that, the light is further reflected by the third printing mirror 14 provided at the rear portion and goes toward the photosensitive drum 16 incorporated in the housing 1 through the fourth printing mirror 15. Accordingly, the image on the microfilm F is magnified and projected onto the rotating photosensitive drum 16 through the slit, and image formation processing is performed by a known process. From the paper feed cassette 17 mounted on the front surface of the housing 1. The recording paper K printed on the supplied recording paper K and having the image printed thereon is ejected onto the paper ejection tray 18 formed on the front surface of the housing 1.
Is discharged to. In this print mode, the image is scanned by moving the microfilm F or swinging or linearly moving a specific mirror.

Next, FIGS. 1 and 2 show an embodiment of the present invention, FIG. 1 is a bottom explanatory view, and FIG. 2 is a front view. The moving mechanism 19 of the condenser lens 6 according to this example will be described below. The moving mechanism 19 is used in an image forming apparatus such as a reader printer that projects an image of the microfilm F through the projection lens 8 and moves a plurality of condenser lenses 6. Then, the concave lens 20 which is the first lens of the condenser lens 6 is held, and the first holding member 21 which is movable between predetermined positions and the convex lens 22 which is the second lens of the condenser lens 6 are held and between the predetermined positions. The movable second holding member 23, and the first holding member 21 and the second holding member 23.
And a moving lever 24 connected to the holding member 23. The moving lever 24 is displaceable in the first direction A and the second direction B, the displacement in the first direction A moves the first holding member 21, and the displacement in the second direction B causes the second lever 24 to move.
The holding member 23 is moved.

More specifically, reference numeral 25 is a lens box for the condenser lens 6, and this box-shaped lens box 25 is attachable to and detachable from the main body of the apparatus. Horizontal slot 25
A is formed, and a substantially Z-shaped bent hole 25b and a vertical hole 25c are sequentially formed in the vertical direction in FIG. The concave lens 20 is held in an upright state by a bent plate-shaped first holding member 21 as shown in FIG. 2, and the first holding member 21 has two step screws 26 and step screws 26, respectively. The collar 27 and the like fitted therein are slidably attached to the right portion in the lateral elongated hole 25a of the lens box 25 in the drawing, and are supported by the bottom surface of the lens box 25 and regulated by the lateral elongated hole 25a. It can be moved to the left and right above. Also, the convex lens 2
2 is also held in an upright state by a bent plate-shaped second holding member 23 as shown in FIG. 2, and the second holding member 23 has two step screws 26 'and a step screw. The lens box 25 is slidably attached to the left portion of the laterally long hole 25a of the lens box 25 in the drawing by means of a collar 27 'into which the lens box 25 is fitted.
While being supported on the bottom surface of the device, it is regulated by the laterally long hole 25a and is movable in the left-right direction in the drawing.

Next, the moving lever 24 of the moving mechanism 19 of the condenser lens 6 comprises a lever body 28 and a swing lever 29. The lever body 28 is arranged vertically in FIG. 1, and is provided with an elongated hole 30, a caulking shaft 31, a caulking shaft 32, a knob T, and the like in order from the upper end side to the lower end side. First, the step screw 26 and the collar 27 of the first holding member 21 described above are slidably connected to the elongated hole 30, and the lever body 28 is
In FIG. 1, the first holding member 21 can be linearly moved in the left-right direction by swinging displacement in the left-right first direction A, and can also be linearly displaced in the upper-lower second direction B. There is. The upper crimp shaft 31 crimped to the lever body 28 is slidably mounted in the bending hole 25b of the lens box 25 described above, and the lever body 28 is moved in the first direction A on the left and right by the crimp shaft 31. And the amount of linear displacement in the up and down second direction B are regulated along the substantially Z-shaped bending hole 25b. On the other hand, the lower caulking shaft 32, which is caulked to the lever body 28, is slidably attached to the vertical hole 25c of the lens box 25 described above, and since the vertical hole 25c functions as a fulcrum restricting member as described later, the caulking shaft 32 As a result, the lever main body 28 is swingably displaced in the first direction A on the left and right, and
It is linearly displaceable in the up and down second direction B through the vertical hole 25c. The knob T is attached to the lower end of the lever body 28 and is located outside the lens box 25, and the knob T operates the lever body 28 and the moving mechanism 19.

Now, the swing lever 29 of the moving lever 24 of the moving mechanism 19 has a substantially V shape, and has elongated holes 3 at both ends.
A round hole 35 is formed in each of the central portions 3 and 34. First, the stepped screw 26 'and the collar 27' of the second holding member 23 described above are slidably connected to the elongated hole 33 at one end. To the second holding member 2 by swinging displacement to
3 can be moved linearly in the left-right direction. Round hole 3
5 is attached to the bottom surface of the lens box 25 with a mounting pin 36 or the like.
9 is swingable in the left-right direction. Further, the caulking shaft 32 of the lever body 28 described above is slidably connected to the elongated hole 34 at the other end, so that the swing lever 29 can move the swing lever 29 up and down in the second direction. Following the linear displacement to B, the rocking displacement is made to the left and right.

Therefore, when the knob T of the moving mechanism 19 is operated to apply a force in the first direction A to the force point C of the lever main body 28 of the moving lever 24, the lever main body 28
Oscillates in the first direction A on the left and right around a fulcrum D near the caulking shaft 32. Then, the force is transmitted to the first holding member 21 via the step screw 26, the collar 27, etc., with the vicinity of the contact portion of the elongated hole 30 of the lever body 28 with the step screw 26, the collar 27, etc. as an action point E. .. At that time, the force that is regulated by the laterally long hole 25a of the lens box 25 and swingably displaces the lever main body 28 is changed to a force that linearly moves the first holding member 21 in the left-right direction, and eventually the concave lens 20 moves left and right. Is moved linearly in the direction. When the lever body 28 is swung, the caulking shaft 31 is restricted by the upper side or the lower side of the bending hole 25b of the lens box 25, so that the fulcrum D of the lever body 28 does not move up and down. Since the fulcrum D of the lever body 28 is not displaced in the vertical direction, the swing lever 29, the second holding member 23, the convex lens 22 and the like do not perform swing displacement, linear movement in the horizontal direction, or the like.

On the other hand, when the knob T of the moving mechanism 19 is operated to apply a force in the second direction B to the force point C of the lever main body 28 of the moving lever 24, the lever main body 28
Is a slot 30 along the step screw 26 and collar 27,
Also, the caulking shaft 31 is the bent hole 25b of the lens box 25.
Is regulated by the vertical portion, and the caulking shaft 32 is further regulated by the vertical hole 25c of the lens box 25, and is linearly displaced in the up and down second direction B. Then, the swing lever 29 connected to the caulking shaft 32 has its force point F in the vicinity of the contact portion of the oblong hole 34 with the caulking shaft 32, its vicinity in the round hole 35 as its fulcrum G, and the stepped screw 26 of the oblong hole 33. ′, The collar 27 ′, and the like are oscillated and displaced in the left-right direction with the vicinity of the contact portion as the point of action H. As described above, the swing lever 29 swings and displaces in the left and right direction following the linear displacement of the lever main body 28 in the second direction B up and down, so that the force is applied from the point of action H to the step screw 26.
′, Collar 27 ′, etc., and is transmitted to the second holding member 23. At that time, the force of the rocking displacement of the rocking lever 29, which is regulated by the laterally long hole 25a of the lens box 25, is changed to the force of linearly moving the second holding member 23 in the left-right direction, and the convex lens 22 is eventually moved. It is moved linearly in the left-right direction. In this case, the first holding member 21, the concave lens 20, and the like are not moved in the left-right direction at all because the lever body 28 does not swing and displace in the first direction A.

Next, FIGS. 3, 4, 5, and 6 are explanatory views of the bottom of the same embodiment, FIG. 3 showing the time when the 7.5 × single focus projection lens 8 is attached, and FIG. When the zoom projection lens 8 of 13 times to 27 times is attached, FIG. 5 shows the time when the zoom projection lens 8 of 9 times to 16 times is attached, and FIG.
Each time when the double zoom projection lens 8 is attached is shown.
Although FIGS. 3, 4, 5, and 6 show the bottom surface of the lens box 25 as seen from the outside, in order to facilitate understanding of the drawings, the lever located on the front side of the bottom surface of the lens box 25. Moving lever 2 such as main body 28 and swing lever 29
4 is indicated by a broken line for convenience, and the lens box 25
The condenser lens 6 such as the concave lens 20 and the convex lens 22 behind the bottom surface of FIG.

Now, as shown in these drawings, the concave lens 20 and the convex lens 22 of the condenser lens 6 are appropriately moved by the moving lever 24 of the moving mechanism 19 and each predetermined according to the type of the projection lens 8. In the case of the 7.5 × single focus projection lens 8 of FIG. 3, both the concave lens 20 and the convex lens 22 are positioned at the left position J,
In the case of the zoom projection lens 8 of 13 times to 27 times in FIG. 4, the concave lens 20 is at the central position L in the drawing, and the convex lens 22 is at the left position K, and further 9 times to 16 times in FIG. In the case of the zoom projection lens 8, the concave lens 20 is at the central position L in the drawing, the convex lens 22 is also at the central position M, and FIG.
In the case of the 20 × to 50 × zoom projection lens 8, the concave lens 20 is positioned at the right position N and the convex lens 22 is positioned at the central position M in the drawing.

By the way, in each of these figures including FIG. 1 and FIG. 2, 37 is a detection plate, and this detection plate 37 is the first plate.
The base end is fixed to the holding member 21 and extends rightward in the drawing, and a plurality of detection notches 38 are formed in a groove shape. On the bottom surface of the lens box 25, two sensors 39 and 40 are arranged side by side so as to correspond to the detection plate 37. The sensors 39 and 40 are set, for example, to ON when the detection plate 37 is not detected (including the case where the detection notch 38 is positioned corresponding to the sensors 39 and 40), and OFF when the detection plate 37 is detected. There is. Further, reference numeral 41 in the drawing denotes a detection piece, and this detection piece 41 is provided so as to project from one end portion of the swing lever 29 of the moving lever 24, and the corresponding position can be provided on the bottom surface of the lens box 25. A sensor 42 is provided. The sensor 42 is, for example, set to ON when the detection piece 41 is not detected and set to OFF when the detection piece 41 is detected.

Then, these detection plate 37 and detection notch 3
8, the relationship between the sensors 39 and 40, and the relationship between the detection piece 41 and the sensor 42 are set as follows. That is, first, in the case of the 7.5 × single focus projection lens 8 in FIG. 3, the concave lens 20 is at the predetermined left position J, and the detection plate 37
Is not detected by the sensor 39 at the detection notch 38 and is not detected by the sensor 40.
Both 40 are on, the convex lens 22 is at a predetermined left position K, the detection piece 41 is detected by the sensor 42, and the sensor 42 is turned off. Next, in the case of the 13 × to 27 × zoom projection lens 8 in FIG. 4, the concave lens 20 is at the predetermined center position L, and the detection plate 37 is not detected by the sensor 39 at the detection notch 38, but is detected by the sensor 40. Sensor 39 is on and sensor 40 is off, convex lens 22 is at a predetermined left position K, detection piece 41 is detected by sensor 42, and sensor 42 is off. There is.

Further, in the case of the 9 × to 16 × zoom projection lens 8 of FIG. 5, the concave lens 20 is at a predetermined center position L, and the detection plate 37 is not detected by the sensor 39 at the detection notch 38. Since it is detected by the sensor 40, the sensor 39 is on and the sensor 40 is off, the convex lens 22 is at the predetermined center position M, the detection piece 41 is not detected by the sensor 42, and the sensor 42 is on. Becomes Furthermore,
In the case of the 20 × to 50 × zoom projection lens 8 in FIG. 6, the concave lens 20 is at the predetermined right position N, and the detection plate 37
Is not detected by the sensors 39, 40 at the detection notch 38, the sensors 39, 40 are on, the convex lens 22 is at a predetermined center position M, and the detection piece 41 is not detected by the sensor 42. The sensor 42 is also turned on.

It should be noted that the moving mechanism 19 moves from the mounting state of the 7.5 × single focus projection lens 8 in FIG. 3 to the mounting state of the 13 × to 27 × zoom projection lens 8 in FIG. The lever 24 for operation is in the middle of operating in the left direction in the drawing in the first direction A (the state indicated by the one-dot chain line in FIG. 3), that is, the convex lens 22 remains in the left position K and the concave lens 20 remains in the left position. J
In the state of being moved from to the central position L, it is as follows. That is, the detection plate 37 is detected by the sensor 39 but not by the sensor 40, the sensor 39 is off and the sensor 40 is on, and the detection piece 41 continues to be detected by the sensor 42 and the sensor 42 is It is off.

Next, the moving mechanism 19 moves from the mounting state of the 13 × to 27 × zoom projection lens 8 in FIG. 4 to the mounting state of the 9 × to 16 × zoom projection lens 8 in FIG.
Is in the middle of operating the moving lever 24 in the second direction B downward in the drawing (the state shown by the dashed line in FIG. 4), that is, the concave lens 20 remains in the center position L and the convex lens 22
In the state of moving from the left position K to the central position M, the following occurs. That is, the detection plate 37 has the sensors 39, 40.
Detected by sensors 39 and 40 are both off,
Further, the detection piece 41 also continues to be detected by the sensor 42 and the sensor 4
2 is also off.

Further, for moving the moving mechanism 19 from the mounting state of the 9 × to 16 × zoom projection lens 8 in FIG. 5 to the mounting state of the 20 × to 50 × zoom projection lens 8 in FIG. The lever 24 is in the middle of operation in the left direction of the drawing in the first direction A (the state indicated by the dashed line in FIG. 5), that is, the convex lens 22 remains in the center position M and the concave lens 20 remains in the center position. When moving from L to the right position N, the following occurs. That is, the detection plate 37 is detected by the sensors 39 and 40, both the sensors 39 and 40 are off, and
The detection piece 41 is not detected by the sensor 42, and the sensor 42 is on.

In this way, the sensors 39, 40, 42
It is determined whether or not the concave lens 20 and the convex lens 22 are in a combination of four types of predetermined positions according to the projection lens 8 based on the ON / OFF state of. In this way, this reader printer detects the position of the first holding member 21, the second holding member 23 of the moving mechanism 19 of the condenser lens 6 or the position of the moving lever 24, and the detection result of this detecting means. The control means for disabling the image forming operation when it is determined that the concave lens 20 and the convex lens 22 are not in their respective predetermined positions on the basis of the above. That is, the reader printer in the illustrated example detects the positions of the detection plate 37 provided on the first holding member 21 and provided with the detection notch 38, and the detection piece 41 provided on the swing lever 29 of the moving lever 24, respectively. Sensors 39, 40, which are detection means for
42 is included. Then, the sensors 39, 40, 4
Although the detection result of No. 2 is input to the control means such as a microcomputer, the concave lens 20 and the convex lens 22 are shown in FIG.
As shown in FIGS. 4, 5 and 6, when it is determined that the predetermined position corresponding to the projection lens 8 is not present (that is, when the sensor 39 is off), for example, a signal for prohibiting the printing operation is issued. It is output to the necessary places.

The present invention has been described in detail above. Then it becomes as follows. In the reader printer which is an example of the image forming apparatus, as shown in FIG. 8, the light from the light source 5 irradiates the microfilm F through the concave lens 20 and the convex lens 22, that is, the plurality of condenser lenses 6, and the image is displayed. An image forming operation is performed such that the image is projected through the projection lens 8 and is enlarged and projected on the screen 11 or the photoconductor drum 16 for viewing or printing. The projection lens 8 can be attached with several kinds of different magnifications in order to change the projection magnification. In the illustrated example, a 7.5x single focus projection lens 8 and a 13x to 27x zoom projection lens are provided. The lens 8, the 9 × to 16 × zoom projection lens 8 and the 20 × to 50 × zoom projection lens 8 are appropriately selected and used in exchange.

In the moving mechanism 19 of the condenser lens 6 as described above, the lever main body 28 of the moving lever 24 is displaced by the operation of the knob T as shown in FIGS. , The first lens of the condenser lens 6, that is, the concave lens 20 is linearly moved in the left-right direction via the first holding member 21 and the like by swinging displacement in the left-right first direction A, and the left position J, the center The second lens of the condenser lens 6, that is, the second lens of the condenser lens 6, is moved through the swing lever 29, the second holding member 23, etc. By moving the convex lens 22 linearly in the left-right direction,
Positioning is performed at predetermined positions of the left position K and the central position M. Therefore, when the moving mechanism 19 for the condenser lens 6 is used, the following first, second, and third aspects are obtained.

First, the adjustment of the absolute illuminance and the illuminance unevenness of each projection lens 8 which is selected, exchanged, and mounted is performed by moving the lever body 28 of the moving lever 24 of the moving mechanism 19 in the first direction A.
Then, by appropriately displacing in the second direction B, the concave lens 20 and the convex lens 22 of the condenser lens 6 are independently moved to their respective predetermined positions. That is, when the 7.5 × single focus projection lens 8 of FIG. 3 is mounted, both the concave lens 20 and the convex lens 22 are located at the left positions J and K in the drawing, and the 13 × to 27 × zoom projection lens 8 of FIG. When the lens is attached, the concave lens 20 is at the central position L in the drawing, the convex lens 22 is at the left position K, and
When the 9 × to 16 × zoom projection lens 8 of FIG. 5 is mounted, the concave lens 20 is located at the central position L in the drawing and is convex.
2 is also located at the center position M, and when the 20 × to 50 × zoom projection lens 8 in FIG. 6 is mounted, the concave lens 20 is located at the right position N and the convex lens 22 is located at the center position M in the drawing.

Therefore, even when the number of replaceable projection lenses 8 is large, for example, four, the projection lens 8 can be formed by combining the predetermined positions J, K, L, M and N of the concave lens 20 and the convex lens 22. It is possible to arrange the concave lens 20 and the convex lens 22 at four optimum combination positions, so that the absolute illuminance and the illuminance unevenness can be finely and sufficiently adjusted. Therefore, the illuminance can be adjusted without shifting the image forming point of the light from the light source 5 from the image principal point of the projection lens 8. For example, the amount of light passing through the peripheral portion of the projection lens 8 becomes smaller than the amount of light passing through the central portion. Therefore, the absolute illuminance can be satisfied and the illuminance unevenness can be prevented. That is, the adjustment of absolute illuminance and illuminance unevenness does not become insufficient unlike the conventional example of this type in which only a part of the illumination system is moved.

Secondly, in this moving mechanism 19, by sequentially displacing one moving lever 24 in the first direction A and the second direction B, both the concave lens 20 and the convex lens 22 of the condenser lens 6 are moved. It can move to each predetermined position, the absolute illuminance according to the projection lens 8,
Since the uneven illuminance is adjusted, the adjusting operation is easy and easy. In other words, although the moving mechanism 19 is of a system that moves a plurality of parts of the illumination system, its operation is easily and easily realized by operating a single moving lever 24 instead of operating each of the plurality of levers. To be done. Moreover, thirdly, such a moving mechanism 19 is provided in the predetermined lever main body 2
8 and a moving lever 24 provided with a swing lever 29,
Unlike the conventional example of this type in which a plurality of parts of the illumination system are moved, a drive motor, a microcomputer, etc. are not used, so that the size of the entire device is not increased and the cost is excellent.

Further, in this reader printer, the detection results of the sensors 39, 40, 42 which are detection means for detecting the positions of the first holding member 21, the second holding member 23 of the moving mechanism 19, the moving lever 24, etc. On the basis of the above, if it is determined that the concave lens 20 and the convex lens 22 of the condenser lens 6 are not in the respective predetermined positions corresponding to the projection lens 8, the control means such as a microcomputer performs an image forming operation such as a printing operation. It is supposed to be impossible. Therefore, the operation and operation of the entire device are ensured.

First, in the above-described embodiment, both the first holding member 21 and the second holding member 23 hold one concave lens 20 and one convex lens 22, respectively, but the present invention is not limited to this. However, each of the first holding member 21 and the second holding member 23 has a plurality of concave lenses 20 or a plurality of concave lenses 20.
The convex lens 22 may be held. Secondly,
In the above-described embodiment, the concave lens 20 of the condenser lens 6 is based on the detection results of the sensors 39, 40, 42.
When it is determined that the convex lens 22 is not in the predetermined position, the image forming operation such as the printing operation is disabled. However, a sensor for detecting the type of the projection lens 8 is additionally provided, and the sensor is controlled by the control unit. The type of the projection lens 8 detected by the concave lens 20 detected by the above
If it is determined that the respective predetermined positions of the convex lens 22 do not correspond to each other, the image forming operation such as the print operation may be disabled or a warning to that effect may be given.

[0034]

According to the condenser lens moving mechanism of the first aspect of the present invention, the first lens is moved through the first holding member by the displacement in the first direction, and the second lens is held by the displacement in the second direction. The following effects are exhibited by using the moving lever that moves the second lens through the member. First, even if the number of replaceable projection lenses is increased to, for example, four, the absolute illuminance and the illuminance unevenness can be finely and sufficiently adjusted to satisfy the absolute illuminance and prevent the illuminance unevenness.
For example, the illuminance can be adjusted without causing unevenness in the illuminance such that the peripheral portion of the image projected on the screen becomes dark. Secondly, both the first lens and the second lens can be moved to their respective predetermined positions by operating one moving lever, and the adjustment operation is simple and easy, and the operation on the user side is easy and easy. Thirdly, since the drive motor, the microcomputer, etc. are not used, the size of the entire apparatus is not increased, and the cost is not increased, which is excellent in cost.

The image forming apparatus according to claim 2 of the present invention is
Further, when the first lens and the second lens are not in the predetermined positions, by including a detection means and a control means for disabling an image forming operation such as a printing operation, the operation of the entire apparatus Operations etc. are ensured.

[Brief description of drawings]

FIG. 1 is an explanatory bottom view showing an embodiment of a moving mechanism of a condenser lens according to the present invention.

FIG. 2 is a front view of the embodiment.

FIG. 3 is a bottom view for explaining a case where a 7.5 × single focus projection lens is mounted in the same embodiment.

FIG. 4 is a bottom view of the same embodiment when a 13 × to 27 × zoom projection lens is attached.

FIG. 5 is a bottom view for explaining a case where a 9 × to 16 × zoom projection lens is mounted in the same embodiment.

FIG. 6 is a bottom view for explaining a case where a 20 × to 50 × zoom projection lens is mounted in the example.

FIG. 7 is an external perspective view of a reader printer.

FIG. 8 is a perspective explanatory view of an optical system of the reader printer.

[Explanation of symbols]

 6 Condenser Lens 8 Projection Lens 19 Moving Mechanism 20 Concave Lens (First Lens) 21 First Holding Member 22 Convex Lens (Second Lens) 23 Second Holding Member 24 Moving Lever 39 Sensor (Detecting Means) 40 Sensor (Detecting Means) 42 Sensor (Detector) A First direction B Second direction J Left position (predetermined position) K Left position (predetermined position) L Center position (predetermined position) M Center position (predetermined position) N Right position (predetermined position)

Claims (2)

[Claims] 1. A moving mechanism for a plurality of condenser lenses used in an image forming apparatus for projecting an image through a projection lens, wherein the first condenser lens holds the first lens of the condenser lens and is movable between predetermined positions. A holding member, a second holding member that holds the second lens of the condenser lens and is movable between predetermined positions, and a moving lever connected to the first holding member and the second holding member,
The moving lever is displaceable in a first direction and a second direction, the displacement in the first direction moves the first holding member, and the displacement in the second direction displaces the second holding member. A moving mechanism of a condenser lens characterized by moving. 2. A detecting means for detecting the position of the first holding member, the second holding member, a moving lever or the like in the moving mechanism of the condenser lens according to claim 1, and the detecting means based on the detection result of the detecting means. An image forming apparatus comprising: a control unit that disables an image forming operation when the first lens and the second lens are not in predetermined positions.