JPH0820668B2 - Micro reader - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Industrial Application" The present invention relates to microreaders. That is, the present invention relates to a microreader such as a reader for enlarging and projecting an image on a microfilm with a projection lens for viewing, and a reader / printer for further printing.

"Prior Art" In this type of micro reader, the projection lens can usually be replaced with a single focus lens and a zoom lens. When the set projection lens is a zoom lens, become.

When the magnification of the zoom lens is changed by zooming, it is necessary to grasp the magnification and feed it back to various controls.

This relationship will be described first in a conventional example relating to feedback to a movable condenser lens, which is a particularly remarkable case.

That is, when the magnification is changed by zooming the zoom lens, the illuminance distribution and the illuminance on the image receptor surface correspondingly change. Therefore, in order to obtain a high-quality image, it is necessary to change the relative position with respect to the light source, such as moving the condenser lens to a position where unevenness in illuminance and reduction in illuminance do not occur at each magnification change.

Therefore, zoom lenses have been conventionally handled as follows, for example.

First of all, when setting the zoom lens in the main body of the apparatus, the minimum magnification has been adjusted. This is when you set the zoom lens with different magnification,
This is because it becomes difficult to grasp the magnification after zooming.

Then, the condenser lens moved to the position corresponding to the minimum magnification or the like is also accurately grasped the magnification of the zoom lens by the posterior zooming, so that the condenser lens is moved to the position corresponding to the magnification change.

On the other hand, secondly, a predetermined bar code or resistance volume is attached to the zoom lens side, and the magnification is detected based on the read value, voltage value, etc. that change in correspondence with zooming, and thus the condenser is used as described above. It was also considered to feed back to the lens. According to this method, it is not necessary to adjust the zoom lens to the minimum magnification when setting it.

For example, a conventional example relating to feedback to a movable condenser lens is as described above.

“Problems to be Solved by the Invention” As described above, when the magnification of the zoom lens is variously changed by zooming, it is usually not easy to grasp the corresponding magnification first. Therefore, it is not easy to accurately grasp and display the magnification, and to accurately perform various feedback controls based on the magnification.

In particular, the following problems have been pointed out in the above-mentioned conventional example relating to feedback to the movable condenser lens.

First, in the method of adjusting to the minimum magnification etc. of the prior art example 1, it is necessary to adjust to the minimum magnification etc. every time the zoom lens is set in the main body, which is very troublesome and has a problem in operability. In other words, when changing the lens to the zoom lens, it is necessary to manually zoom at the variable magnification end of either the maximum magnification or the minimum magnification of the replaced zoom lens, which is troublesome and complicated, and operability The problem was pointed out. In addition, there are many cases where the adjustment is forgotten, which causes uneven illuminance on the surface of the image receptor and a decrease in illuminance, resulting in deterioration of image quality and miscopy.

On the other hand, in the method of attaching the bar code, the resistance volume, etc. of the conventional example 2, the configuration around the zoom lens becomes complicated due to the attachment, the control thereof is complicated, and there is a difficulty in reliability. There have been fatal problems in terms of optics, performance, and cost, since many adjustments are required.

 The above problems have been pointed out in conventional examples.

The present invention has been made in view of the above circumstances in order to solve the problems of the above-mentioned conventional examples, and the detection means,
When it is detected that the zoom lens has been set, the zoom drive mechanism is driven by the control means, and the zoom lens is automatically zoomed to the maximum or minimum magnification change end. ing. Therefore, it is possible to set the zoom lens at any magnification, and the operability is improved, and it is possible to accurately grasp the magnification, so that a high quality image can be obtained, and the optical surface, the performance surface, and the cost surface are excellent. , Aim to propose a microleader.

"Means for Solving Problems" The technical means of the present invention for achieving this object are as follows.

This microreader is a microreader in which a projection lens for enlarging and projecting an image on a microfilm can be replaced with a single focus lens and a zoom lens, and a detection means for detecting the type of the set projection lens, A zoom drive mechanism of the zoom lens and a control means for controlling the drive of the zoom drive mechanism are provided. When the detecting unit detects that the zoom lens is set, the control unit controls the zoom driving mechanism so that the zoom lens is zoomed to the zooming end. To do.

"Operation" Since the microreader of the present invention comprises such means, it operates as follows. That is, this leader,
In a micro reader such as a reader printer, the image on the micro film is enlarged and projected by a projection lens.
This projection lens can be replaced with a single focus lens, that is, a single lens and a zoom lens. Then, when the projection lens is set, the detecting means first detects whether the type of the projection lens set is a single lens or a zoom lens. Therefore, when the detection means detects that the zoom lens is set, the zoom drive mechanism is driven by the control means including, for example, a microcomputer, and the zoom lens is set to either the maximum magnification or the minimum magnification from the magnification at the time of setting. Zooming is automatically performed until the zooming end.

After that, the zoom lens is scaled to the operator's desired magnification from such a magnification end,
The magnification can also be accurately grasped. Therefore, it is possible to display the magnification of the zoom lens accurately, and it is also possible to easily and accurately feed back the magnification of the zoom lens to various controls.

That is, especially in the case of the movable condenser lens, it is moved to a position corresponding to the zooming of the zoom lens, and accordingly, the illuminance distribution and the illuminance on the image receiving surface are appropriately adjusted, and a high-quality image is always obtained. It will be.

The zoom lens may be set at any magnification, which improves operability and simplifies the configuration and control.

[Examples] The present invention will be described in detail below based on the examples shown in the drawings.

First of all, regarding the configuration, reader printer overview, projection lens, lens box, overview of each drive mechanism, operation panel, control by magnification instruction means, zoom lens and zoom drive mechanism, specific control example, related control, C lens drive The mechanism will be described in order.

The outline of a reader printer, which is an example of a micro reader, is as follows.

FIG. 8 is a perspective view of an optical system of the example, and FIG. 9 is a front view of the same.

Light from the light source such as the exposure lamp 1 is condensed by the condenser lens 2 and the fixed condenser lens 3,
Irradiate the original such as microfilm 4 from below,
It reaches the projection lens 5. Therefore, the image on the microfilm 4 is enlarged and projected by the projection lens 5.

Then, in the reader mode, the image from the projection lens 5 is bent by the reader first mirror 6 and the fixed reader second mirror 7 at the reader position, and enlarged on the screen 8 which is an image receiver arranged on the upper front surface of the main body. Projected. During this time, the printer first mirror 9 moves to the retracted position on the right side in the figure and assumes a folding posture, and the print third mirror 10 also moves to the retracted position on the front side in the figure and retracts out of the formed leader optical path. ing.

Next, in the print mode, first the reader first mirror 6
Moves upward from the leader position and retracts outside the optical path of the formed printer. Instead, the print first mirror 9 and the print third mirror 10 are synchronously moved from the retracted position to the left and rear scanning start positions in the drawing, respectively, and then the right and front scanning is performed from the respective scanning start positions. Scan and move toward the end position. In this way, the image from the projection lens 5 is bent by the print first mirror 9, the fixed print second mirror 11, the print third mirror 10, and the fixed print fourth mirror 12 to form a slit (not shown). Through the projection) onto the surface of the photoconductor 13 which is a rotary drum image receptor. Then, an image is formed by a known process and is copied on the copy paper 14.

In the figure, reference numeral 15 is a roll film carrier in which the microfilm 4 is loaded, 16 is a reflection mirror arranged behind the exposure lamp 1, and 17 is a mirror for bending light upward.

 The reader printer is like this.

 Next, the projection lens 5 and the like will be described.

FIG. 1 is a perspective explanatory view showing the projection lens 5, a lens box, which will be described later, each drive mechanism and the like.

The types of the projection lens 5 are a single lens 18 and a zoom lens 19
And one of them is selected and used.

As the single lens 18, a desired one is selected and used from a plurality of single lenses having different magnifications. The single lens 18 is held in the lens barrel 20, and the lens barrel 20 is loosely inserted and held in the opening 22 of the handle plate 21. Further, a focus gear 23 is attached to the outer periphery of the lens barrel 20 so as to be independently rotatable, and a helicoid screw or the like is provided so that the single lens 18 can be vertically moved by the rotation of the focus gear 23.

Similarly, the zoom lens 19 is also held in the lens barrel 24, and the lens barrel 24 is loosely inserted and held in the opening 26 of the handle plate 25.
A focus gear is attached to the outer circumference of the lens barrel 24 so that it can be independently rotated.
27 is attached, and a cam ring, a pin and the like are attached so that the zoom lens 19 can be moved up and down by the rotation of the focus gear 27. Further, a zoom gear 28 is attached to the outer periphery of the lens barrel 24 so as to be independently rotatable, and the rotation of the zoom gear 28 changes the distance between the lens balls in the zoom lens 19 so that zooming can be performed. There is. The zoom gear 28 is not rotatable endlessly, but is configured to stop at a position corresponding to the maximum magnification and the minimum magnification of the zoom lens 19 and not rotate further or more. A bent portion 29 for detection, which will be described later, is provided upright at the right corner of the handle plate 25 in the figure.

Reference numeral 30 is a prism, and this prism 30 is for optical image rotation, that is, for rotating the projection image and appropriately adjusting the orientation of the image.
And this prism 30 is held in the lens barrel 31,
A prism gear 32 is attached to the outer periphery of 31 so as to be independently rotatable, and the prism 30 is internally configured so that the prism 30 is rotated by the rotation of the prism gear 32. In use, the lens barrel 31 of the prism 30 is fitted and seated on the lens barrel 20 or 24 of the single lens 18 or the zoom lens 19 which is the projection lens 5.

 The projection lens 5 and the like are configured in this way.

 Next, the lens box 33 and the like will be described.

The lens box 33 has a box shape, and is attached and fixed to an intermediate base 34 of a device body such as a reader printer. Then, in the lens box 33, the selected single lens 18 or zoom lens 19 which is the projection lens 5 is set. That is, the handle plate 21 or 25 is inserted and placed in the lens box 33, and the single lens 18 or the zoom lens
19 is positioned in a notch 35 formed in the center of the bottom plate of the lens box 33.

In the lower left and right corners of the lens box 33, the zoom lens
Detecting means 36 for setting 19 is provided.
As the detection means 36, for example, a photo sensor is used in the illustrated example, and the positional relationship is such that the bent portion 29 of the handle plate 25 of the set zoom lens 19 is inserted between the light emitting portion and the light receiving portion. Is set. Folding part involved
The setting of the zoom lens 19 is detected by the light blocking by 29.

Further, in the illustrated zoom lens 19, a bent portion 29 is formed at the right corner of the handle plate 25 in the figure, and this is detected by the detection means 36 arranged at the right corner of the lens box 33 in the figure. ing. Therefore, in another zoom lens 19 different in magnification and the like from this zoom lens 19, a bent portion is formed in the left corner of the handle plate 25, and this is detected at the left corner in the figure of the lens box 33. By detecting by the means 36, it is possible not only to detect the set of the zoom lens 19 but also to determine the type of the set zoom lens 19. Further, by changing the shape, position, etc. of the bent portion 29 and the like and disposing the detecting means 36 correspondingly, it is possible to discriminate between the three or more types of zoom lenses 19.

 The lens box 33 and the like have such a configuration.

 Next, the outline of each drive mechanism will be described.

First, the zoom drive mechanism 37 is as follows. That is, the zoom drive mechanism 37 includes a pulse motor, which is a zoom motor 38 provided in the stationary portion of the main body, a torque limiter 39 whose input side is connected to a rotation shaft of the zoom motor 38, and an output side of the torque limiter 39. In order to interlock the timing pulley 40 connected to the timing pulley 40 with the other timing pulley 41, the endless timing belt 42 stretched between the timing pulley 40 and the other timing pulley 41, and the timing pulley 41 are fixed to one end. And a drive shaft 43. The drive shaft 43 is inserted and held in the lens box 33 via a bearing (not shown) provided in the intermediate base 34, and the other end is in a bearing 44 provided on the bottom plate of the lens box 33. Supported by the lens box
A drive gear 45 is fixedly provided in the 33. In this way, the drive of the zoom motor 38 is transmitted to the drive gear 45. The zoom gear 28 of the zoom lens 19 set in the lens box 33 is positioned so as to mesh with the drive gear 45. The zoom drive mechanism 37 has such a structure.

Next, the focus drive mechanism 46 is the zoom drive mechanism described above.
Configured according to 37. That is, the focus drive mechanism 46 includes a pulse motor 47, which is a focus motor 47 provided in a stationary portion of the main body, and a focus motor 47.
A timing pulley 49 connected to the torque pulley 48 via a torque limiter 48, a timing pulley 51 linked to the timing pulley 49 by a timing belt 50, and a drive shaft 52 having the timing pulley 51 fixed to one end. are doing. The drive shaft 52 is pierced and held in the lens box 33 via a bearing (not shown), and the other end is supported by a bearing 53 provided on the bottom plate of the lens box 33. A drive gear 54 is fixedly provided in the 33. In this way, the drive of the focusing motor 47 is transmitted to the drive gear 54. The focus gear 23 or 27 of the single lens 18 or the zoom lens 19 that is the projection lens 5 set in the lens box 33 is
The drive gear 54 is positioned so as to mesh with it. The focus drive mechanism 46 has such a structure.

The prism drive mechanism 55 is configured according to the zoom drive mechanism 37 and the focus drive mechanism 46 described above.
That is, the same prism motor as described above (not shown), the timing belt 56, and the timing pulley 5
It has a drive shaft 58, a bearing 59, a drive gear 60 and the like. The prism gear 32 of the prism 30 set together with the projection lens 5 in the lens box 33 is positioned so as to mesh with the drive gear 60. The prism drive mechanism 55 has such a structure.

 The outline of each drive mechanism is as described above.

 Next, the operation panel will be described.

FIG. 2 shows an operation panel provided on the front side of the reader printer.

In the figure, 61 is a zoom key, 62 is an image rotation key, and 63 is a focus key. Each of the zoom key 61, the image rotation key 62, and the focus key 63 is a seesaw key that can be pressed in both the left and right directions, and is a two-stage key that can be switched in both directions, and is provided opposite each other. The switch is also a two-stage switch.

Therefore, if you press the zoom key 61 to the right,
When pressed to the left, each zoom signal to the low-magnification side is output as a low-speed signal for fine adjustment when lightly pressed, and as a high-speed signal for feed when strongly pressed, as shown in Fig. 10. , Is input to the control means such as the microcomputer 65 via the port 64. Then, from the microcomputer 65, the corresponding drive signal is sent to the port 64,
The zoom motor of the zoom drive mechanism 37 via the drive circuit 66.
It is output to 38. Therefore, the zoom drive mechanism 37 is driven,
Corresponding zooming will be performed by the zoom lens 19.

Similarly, pressing the focus key 63 to the right or left outputs focus signals in both directions, a light press to output as a low-speed signal for fine adjustment, and a hard press to output as a high-speed signal to feed, respectively. Input to the microcomputer 65. Then, from the microcomputer 65, the corresponding drive signal is sent to the focus drive mechanism 46.
Is output to the focusing motor 47, and the corresponding focusing is performed by the projection lens 5.

The operation of the image rotation key 62 is also the same. 67 is a print key, 68 is a numeric keypad, 69 is a lamp key for turning on and off the exposure lamp 1, and 70 is a clear key.

 The operation panel is like this.

 Next, the control by the magnification instruction means will be described.

First, as the magnification instructing means for the single lens 18 which is the projection lens 5, the one shown in FIG. 3 is used in this embodiment. That is, a magnification instruction key 72 is provided on the peripheral frame 71 of the screen 8 of the reader printer, and when the magnification instruction key 72 is pressed, the magnification instruction sections A, B, C and D, which are light emitting diodes for instructing each magnification, are sequentially arranged. Flashes everywhere. That is, the operator turns on the corresponding magnification instruction section A, B, C or D by pressing the magnification instruction key 72 for the single lens 18 having the desired magnification set in the lens box 33. Then, the magnification signal corresponding to the illuminated magnification instruction section A, B, C or D is input to the control means such as the microcomputer 65 as shown in FIG.

The magnification instructing means for the single lens 18 is not limited to the manual input method shown in FIG. 3, but may be the automatic detection method shown in FIG. 4, for example. That is, each the rear end of the handle plate 21 of the single lens 18, the protruding portion 73 ₁ was different in position by the magnification of the single lens 18, 73 ₂ are formed, the projecting portions 73 _1, 73 ₂ is a single When the lens 18 is set in the lens box 33, the position and size are set so as to be projected rearward from the opening 74 formed in the back plate of the lens box 33. Therefore, corresponding micro switches on the back respectively
75 ₁ and 75 ₂ are arranged, and the protruding portion 73 ₁ or 73 ₂ of the set single lens 18 is detected by the micro switch 75 ₁ or 75 ₂ , and the corresponding magnification signal is input to the microcomputer 65 or the like. Will be done. Although FIG. 4 shows two types of magnifications, it is of course possible to use three or more types of magnifications. The other reference numerals in FIG. 4 are the same as those in FIG.

On the other hand, the magnification instruction means of the zoom lens 19, which is the projection lens 5, is as follows. The magnification instructing means of the zoom lens 19 may be of a manual input type according to the description of the single lens 18 described above, but in this embodiment, an automatic detection type is used. That is,
By depressing the zoom key 61, the zoom motor 38 of the zoom drive mechanism 37 is driven, so that the zoom lens 19 is zoomed from a reference magnification described later to a desired magnification. Therefore, by counting the number of drive pulses during pressing ON / OFF of the zoom key 61, that is, during driving ON / OFF of the zoom motor 38, a corresponding magnification signal is input to the microcomputer 65 or the like.

The magnification instructing means for the single lens 18 and the zoom lens 19 is as described above. Then, the magnification is set based on the magnification instruction, and the following control is performed.

That is, when such a magnification signal is input to the microcomputer 65 or the like to set a magnification, first, the position corresponding to this magnification set is set for the condenser lens 2, and the moving direction and the moving amount to the position are set. Are calculated, and the corresponding drive signal is output to the C lens motor (described later) of the C lens drive mechanism.

Secondly, the speed for fine adjustment in the focus of the projection lens 5 is controlled. That is, since the depth of focus is different for each magnification, the focus drive mechanism 46 suitable for focusing is used.
The driving speed of the above, that is, the rotation speed of the focusing motor 47 is also different. Therefore, corresponding to the magnification setting, the rotational speed is calculated such that the higher the magnification is, the higher the magnification is, and the higher the magnification is, the slower the rotation speed is set.

It should be noted that a constant relational expression holds between the magnification of the projection lens 5, that is, the depth of focus, and the drive speed of the focus drive mechanism 46 suitable for this, and the calculation is performed as described above. Although this relational expression is established without any individual difference, the driving speed more suitable for each person varies proportionally due to the difference in individual sense when viewed for each magnification and depth of focus.
Therefore, based on the above relational expression, it is preferable that the entire level of the driving speed can be adjusted faster or slower.

 The control by the magnification instruction means is performed in this way.

Next, the zoom lens 19 and the zoom drive mechanism 37 will be described in detail.

The zoom lens 19 is supposed to be zoomed to a certain reference magnification, which is a reference for subsequent zooming and the like, by driving the drive mechanism 37 based on the set detection of the detection means 36. The zoom lens 19 is not of an endless zooming mechanism, but is of a type in which zooming is performed between the maximum and minimum zooming ends, and the reference magnification is either of these zooming ends. Is set in advance.

Further, the zoom drive mechanism 37 is an amount necessary to eliminate the tilt of the zoom lens 19 from the posture at all times when the zooming end reaches at least one of the zooming ends due to zooming, and reverse rotation in the direction opposite to that during zooming. Driven.

The zoom lens 19 and the zoom drive mechanism 37 are configured as described above.

 Next, a specific control example will be described with reference to FIG.

θ is the maximum rotation angle of the zoom gear 28, which corresponds to the maximum zoom range between the maximum magnification and the minimum magnification of the zoom lens 19. The maximum rotation angle θ is set to the maximum value among a plurality of zoom lenses 19 having different magnifications and the like, and the detection unit 36 determines the type of each zoom lens 19. If the zoom lens 19 has been selected, it may be set to the one of the determined zoom lens 19. φ is a target rotation angle of the zoom gear 28, which is set to be slightly larger than the maximum rotation angle θ. φ ′ is the actual rotation angle of the corresponding zoom gear 28 starting from the set magnification of the zoom lens 19 to the reference magnification. The reference magnification is set to the minimum magnification.

The set detection signal of the zoom lens 19 by the detection means 36 is input to the microcomputer 65 as shown in FIG. 10, and the drive signal for rotating the zoom gear 28 in the reference magnification direction by the target rotation angle φ is used for the zoom of the zoom drive mechanism 37. motor
Output to 38. Then, the zoom gear 28 starts to rotate by the target rotation angle φ from the set magnification corresponding position, but stops at the reference magnification corresponding position on the way, and the zoom lens 19 is first surely zoomed to the reference magnification.

Since the actual rotation angle φ ′ of this zoom gear 28 is smaller than the target rotation angle φ, the zoom motor 28 that has been stopped is applied with a biasing force to further rotate it in the zooming direction by the zoom motor 38. Then, the zoom gear 28 and the drive gear 45 that meshes with the zoom gear 28 tend to twist, and the zoom lens 19 also tries to tilt from the normal posture facing the glass surfaces of the microfilm 4 and the roll film carrier 15.

Now, when a predetermined load is reached, the drive amount of the zoom motor 38 corresponding to the difference between the target rotation angle φ of the zoom gear 28 and the actual rotation angle φ ′ is absorbed by the torque limiter 39. At the same time, the zoom motor 38 is driven in the reverse direction by a predetermined amount required to eliminate the twist of the zoom gear 28 and the like, and the tilt of the zoom lens 19, so that the zoom gear 28 is also rotated by the necessary angle in the reverse direction, so that the zoom lens 19 also keeps its normal posture. Will be maintained.

Regarding the stop of the zoom gear 28, regardless of the above,
The detection means is provided on the side of the lowest magnification that is the reference magnification, and based on the detection signal of the detection means, the drive itself of the start motor 38 started under the target rotation angle φ is immediately stopped, and thus the zoom gear 28 A method of stopping the rotation is also possible. And even under such a method, the problem of twisting of the zoom gear 28 and drive gear 45 and tilting of the zoom lens 19 occurs based on the urging force that attempts to rotate in the zooming direction so far, in accordance with the above. To do. Therefore, in the same manner as described above, the predetermined amount of zoom motor 38 required for eliminating these is driven in reverse.

 The specific control of FIG. 5 is performed in this way.

 Next, related control will be described.

The reference magnification, that is, either the maximum magnification or the minimum magnification which is the variable magnification end, is used for the subsequent zooming, and further, the movement of the condenser lens 2 and the projection lens 5 as described above.
It is a reference for control in the speed for fine adjustment in the focus. That is, since the posterior zoom lens 19 is zoomed to this reference magnification or the desired magnification,
The magnification of the zoom lens 19 is determined and set based on the drive amount of the zoom motor 38 during that time. Zoom motor
In the present embodiment in which a pulse motor is used as 38, by counting the number of drive pulses of the pulse motor, and when another DC motor is used, the pulse of the encoder attached for synchronization is used. By counting the number, the magnification is set, the condenser lens 2 is moved based on the number of pulses, and the speed for fine adjustment of the focus of the projection lens 5 is set.

Further, since the maximum rotation angle θ of the zoom gear 28 is given, the zoom motor 38 is controlled so that the rotation of the zoom gear 28 is surely stopped on the other variable magnification end side, that is, just before the maximum magnification. Note that, regardless of such control, detection means is provided on the other side of the maximum magnification, which is the zooming end side, and the drive of the zoom motor 38, that is, the rotation of the zoom gear 28 is stopped based on the detection signal of the detection means. As described above, the zoom motor 38 is driven so that it can be driven in the reverse direction by the required amount.
May be controlled.

Further, in the present embodiment, a pulse motor is used as the zoom motor 38 of the zoom drive mechanism 37, and the torque limiter 39 is also used, but when another DC motor is used as the zoom motor 38, Zooming to the standard magnification is performed as described below, regardless of the above. That is, while zooming the zoom lens 19 from the set magnification to the reference magnification side, the rotation speed of the encoder attached to synchronize with the DC motor that is the zoom motor 38 is monitored,
At the zooming end, which is the reference magnification, a load is applied to the zoom motor 38, which slows down the rotation speed of the encoder, and the DC motor that is the zoom motor 38 is stopped by the detection.

When a pulse motor is used as the zoom motor 38 as in this embodiment, the torque is relatively weak, so
It is necessary to make the torque limiter 39 function with a smaller torque than the step out, and the adjustment of the torque limiter 39 becomes strict.

The control related to the zoom lens 19 and the zoom drive mechanism 37 is performed in this way.

 Next, the C lens driving mechanism 76 will be described.

FIG. 6 is a plan view of the C lens driving mechanism 76, and FIG. 7 is a front view of the same. The C lens driving mechanism 76 is of a system in which the condenser lens 2 is moved to change its relative position to the light source such as the exposure lamp 1. A method of moving the exposure lamp 1 side is also possible.

The C lens driving mechanism 76 has a C lens motor 77 such as a pulse motor, a pinion gear 79 mounted on the motor shaft 78, and a rack 80 meshing with the pinion gear 79. The rack 80 is fixed to a holder 81 holding the condenser lens 2 via a support member 82. Further, one side of the holder 81 is slidably supported by a slide bearing 83 on a corresponding operation shaft 84 via a support member 82. The other side of the holder 81 is allowed to travel on the plane of the main body immovable portion by the runner 86 via the support member 85.

Therefore, the condenser lens 2 held by the holder 81 is driven by a predetermined amount of forward and reverse rotation of the C lens motor 77.
Is moved forward and backward by a predetermined distance.

 The C lens drive mechanism 76 has such a structure.

 The above is the description of the configuration and the like.

 Next, the operation and the like will be described.

11 and 12 are flow charts showing the control of the embodiment, FIG. 11 shows the basic control, and FIG. 12 each shows a subroutine. The operation and the like will be described below with reference to these drawings.

First, the operator operates the projection lens 5, that is, the desired single lens.
18 or the zoom lens 19 is set in the lens box 33 of the main body of the reader printer.

Then, in step, after setting the reference position of the condenser lens 2 and other necessary initial settings, it is determined in step that the print key 67 is on. If it is on, the print mode is set in step, and after the printing operation is performed, the process returns. If the print key 67 is off in step, the reader mode is maintained, and the process proceeds to step to determine whether the detecting means 36 of the zoom lens 19 is on. In the illustrated example, whether or not the zoom lens 19 is set is determined by whether or not the bent portion 29 of the handle plate 21 shields the light between the light emitting portion and the light receiving portion of the photo sensor serving as the detecting means 36.

The type of projection lens 5 set in this way is
The single lens 18 or the zoom lens 19 is discriminated, and the detection means 36
If is not on but single lens 18, step,
, ... That is, in steps, ...
The magnification of the single lens 18 is determined by looking at the magnification signals corresponding to the magnification instruction sections A, B, ... Based on the depression of the magnification instruction key 72, which is the magnification instruction means, and the corresponding magnification set is obtained in step. Done. In this step, ... Magnification set, the condenser lens 2 for each magnification
The optimum position is set and the distance a from the reference position to the optimum position and the number of pulses to the pulse motor which is the C lens motor 77 corresponding to the distance a are set and stored.

If the type of the projection lens 5 that is set is determined to be the zoom lens 19 by turning on the detection means 36 in step, the process proceeds to zoom 1 in step. FIG. 12 (1) shows this zoom 1 routine.

In the zoom 1 routine, the zoom motor 38 of the zoom drive mechanism 37 is driven in order to rotate the zoom gear 28 of the zoom lens 19 in the reference magnification direction by the target rotation angle φ in steps. Therefore, in reality, the zoom lens 19 is rotated by the rotation angle φ ′ and stopped, and the zoom lens 19 is zoomed to the reference magnification.

Here, the zoom gear 28 and the drive gear 45 are likely to twist, and the zoom lens 19 always tries to tilt from the posture. Here, the torque limiter 39 functions, and in the next step, the zoom motor 38 is reversely driven by two pulses,
The zoom gear 28 is also reverse-rotated by a required angle in the direction opposite to the zooming direction so far, so that the twist and tilt are eliminated, and the zoom lens 19 can be accurately floated on the glass surface of the roll film carrier 15.

Further, as described above, even if the zoom lens 19 is set at any magnification, it is first zoomed to the reference magnification that becomes the reference thereafter, that is, the maximum magnification or the minimum magnification which is the variable magnification end. Operability is significantly improved.

Next, in step, ..., the type of zoom lens 19 is 1
.., etc. are discriminated by the detecting means 36, and the moving amount coefficient of the condenser lens 2 corresponding to the type of the zoom lens 19 is calculated in corresponding steps ,. The standard magnification is set. With the magnification set, the condenser lens 2 is also used as in the single lens 18 described above.
About the distance from the reference position to the optimum position for that magnification a,
The number of pulses to the corresponding C lens motor 77 is set.

The zoom 1 routine of FIG. 12 (1) is as described above.

Then, the flow returns to FIG. 11, and the condenser lens 2 is moved in step. FIG. 12 (2) shows the movement routine of the condenser lens 2. First, in step, the moving direction and the moving amount of the condenser lens corresponding to each magnification set up to now are calculated. That is, in the case of the single lens 18, the above steps, ...
In the case of the zoom lens 19, the magnification is set in the steps described above, ... And the steps described later. The distance b from the reference position of the condenser lens 2 in the magnification state before the magnification setting is stored, This distance b
Is subtracted from the distance a from the reference position, which is set and stored for that magnification set. The positive / negative of the subtracted value determines the forward / reverse rotation direction of the pulse motor that is the C lens motor 77, that is, the moving direction of the condenser lens 2, and the value determines the number of pulses to the C lens motor 77, that is, the movement of the condenser lens 2. The quantity is determined. Note that in the case of the zoom lens 19, such calculation is performed based on the moving amount coefficient in the above step.

Then, in step S, the C lens motor 77 is turned on,
When the movement of the required movement amount of the condenser lens 2 as calculated, that is, the rotation of the C lens motor 77 is confirmed in step, the drive of the C lens motor 77 is turned off in step. In this way, the condenser lens 2 is moved to the position corresponding to each magnification set. Accordingly, the illuminance distribution and the illuminance are appropriately adjusted on the image receiving surface such as the screen 8 and the photoconductor 13 which are the effective image areas, the illuminance unevenness and the illuminance decrease are eliminated, and a high-quality image is always obtained.

The movement routine of the condenser lens 2 in FIG. 12 (2) is as described above.

Now, the flow returns to Fig. 11, and in steps, press the zoom key.
It is determined that 61 is on, and if it is on, the process proceeds to the zoom 2 routine in step. This zoom 2 is shown in Fig. 12 (3).
Indicates a routine.

In other words, the zoom key which is a seesaw key at the step
For example, it is determined whether the pressed state of 61 is rightward. Then, in step, the direction flag is set or reset corresponding to the direction, and in step, the zoom drive mechanism is set.
The pulse motor, which is the zoom motor 38 of 37, starts driving in that direction, and the zoom key 61 is turned off in step and the zoom motor 38 is stopped in step until the drive is stopped.
The number of drive pulses of is counted. When the zoom key 61 is turned off and released in step, the flow returns to FIG.

In this way, the operator zooms the zoom lens 19 to a desired magnification.

The zoom 2 routine in FIG. 12 (3) is as described above.

Now, returning to FIG. 11, the flow sets the magnification of the zoom lens 19 when the zoom key 61 is turned off in the above step. And the above steps,
, And step ,, the distance a from the reference position to the position suitable for the magnification of the condenser lens 2 and the corresponding pulse number to the C lens motor 77 are set and stored.

Then, the flow returns to the above-mentioned step, that is, the routine for moving the condenser lens 2 in FIG. 12 (2), and thereafter, the above-described steps are repeated.

When the zoom key 61 is turned off and released in step, the process proceeds to step and the state of the focus key 63 is determined. Then, if the focus key 63 is not pressed and is off, the flow returns to the step, and the above is repeated thereafter.

When the focus key 63 is pressed and turned on in step, the process proceeds to focus in step. First
FIG. 12 (4) shows this focus routine.

That is, in the focus routine, first in step, the drive speed of the focus drive mechanism 46 corresponding to the set magnification of the projection lens 5 is calculated. That is, the single lens 18
In the case of, the set magnification in steps, ..., In the case of the zoom lens 19, the set magnification in steps or the set magnification in steps ,. Therefore, based on this, at least the rotation speed of the focusing motor 47 for fine adjustment in focusing, and the frequency of the pulse given in the case of a pulse motor are calculated.

Then, in the next step, it is determined whether or not the pressed state of the focus key 63, which is a seesaw key, is in the right direction, for example.
Then, in step, the direction flag is set or reset corresponding to that direction, and in step, the focusing motor 47 of the focus drive mechanism 46 moves in that direction in step, at the speed given in step. It is driven until the key 63 is turned off and stopped in steps.

In this way, the fine adjustment of the focus is performed in accordance with the magnification when the magnification is low and the depth of focus is large, and when the magnification is high and the depth of focus is small, it is slow. Accordingly, the focus speed at the time of fine adjustment, that is, the moving speed of the projection lens 5 becomes appropriate, and the focus becomes smooth and easy.

The flow returns to FIG. 1 when the focusing motor 47 is stopped and turned off in step.

The focus routine of FIG. 12 (4) is as described above.

Then, the flow returns to the step of FIG.
After that, the above-mentioned place is repeated.

 The above is the description of the operation and the like.

[Advantages of the Invention] In the microreader such as the reader and the reader / printer according to the present invention, as described above, when the detection unit detects that the zoom lens is set, the zoom drive mechanism is driven by the control unit, The zoom lens is automatically zoomed at the variable magnification end of either the highest magnification or the lowest magnification.

Therefore, the zoom lens may be set at any magnification, and the operability is improved. In other words, when replacing the lens with a zoom lens, it is not necessary to manually zoom the replaced zoom lens to the variable magnification end of the maximum magnification or the minimum magnification, and the zoom lens automatically It is zoomed to the variable magnification end. Therefore, operability is greatly improved by saving labor and eliminating complexity.

Along with this, the situation of forgetting to zoom to such a zoom end will not occur. Therefore, accurate magnification display and feedback to various controls based on the scaled magnification become easy and accurate, and especially the control of the movable condenser lens becomes accurate, and there is no miscopy due to forgetting to adjust it. A good quality image can be obtained. Further, its configuration and control are also simplified and easy, and reliability is high, and it is excellent in optical surface, performance surface, and cost surface, and the problems existing in this kind of conventional example are eliminated. There is a remarkable and great thing.

[Brief description of drawings]

FIG. 1 is a perspective explanatory view of an essential part showing an embodiment of a micro reader according to the present invention. FIG. 2 is a front view of the operation pulse. 3 and 4 each show an example of a single lens magnification instruction means,
FIG. 3 is a front view of a magnification instruction key or the like by a manual input method, and FIG. 4 is a perspective explanatory view of a protrusion, a micro switch, etc. by an automatic detection method. FIG. 5 is an explanatory diagram showing a specific control example of the zoom lens and the like. 6 and 7 show C lens driving, FIG. 6 is a plan view thereof, and FIG. 7 is a front view thereof. 8 and 9 show a reader printer, FIG. 8 is a perspective view of the optical system thereof, and FIG. 9 is a front view thereof. FIG. 10 is a block diagram showing the control means according to the above embodiment. FIG. 11 and FIG. 12 are flowcharts of the control according to the above embodiment, FIG. 11 shows the basic control, FIG. 12 shows each routine thereof, and FIG. FIG. 2 (2) shows a condenser lens moving routine, FIG. 3 (3) shows a zoom 2 routine, and FIG. 4 (4) shows a focus routine. 4 …… Micro film 5 …… Projection lens 18 …… Single lens (single focus lens) 19 …… Zoom lens 36 …… Detecting means 37 …… Zoom drive mechanism 65 …… Microcomputer (control means)

Claims (1)

[Claims] 1. A microreader in which a projection lens for magnifying and projecting an image on a microfilm can be replaced with a single focus lens and a zoom lens. And a control means for controlling the drive of the zoom drive mechanism, the control means, when the detection means detects that the zoom lens is set, the zoom lens A micro reader characterized in that the zoom drive mechanism is controlled so that the zoom lens is zoomed to the zoom end.