JPS58163933A - Composite variable power exposing method of photoreceptor - Google Patents

Abstract

PURPOSE:To obtain a large longitudinal and lateral variable power ratio, and also to obtain a titled photoreceptor by simple constitution only, by using an anamorphic lens in combination with an image forming lens system. CONSTITUTION:In an exposure optical path by an image forming lens system L, an anamorphic lens 6 having a distortion image effect of unmagnification in one direction and m' times in its orthogonal direction is provided so that the unmagnification direction corresponds to the lengthwise direction of a slit exposure part. Subsequently, a speed ratio of a scanning speed for slit-scanning an original and an exposing speed for slit-exposing a photoreceptor is decided in accordance with magnification (m) of the image forming lens system and magnification (m') of the anamorphic lens 6, and on the photoreceptor, a latent image corresponding to the original is formed by varying its magnification to (m) times in the lengthwise direction of the slit exposure part, and mxm' times in its orthogonal direction.

Description

[Detailed description of the invention] The present invention relates to a compound variable magnification exposure method for a photoreceptor.

A combination of slit exposure methods is well known.

The slit exposure method scans the original with a slit,
This is an exposure method in which an image of a slit-shaped portion of a document is formed and projected onto a photoreceptor using an imaging element system, and the photoreceptor is exposed to light.
A compound variable magnification exposure method has been proposed in which the copying magnification is made different in the longitudinal direction of the slit exposure section and in the direction orthogonal to this longitudinal direction (Japanese Patent Application Laid-Open No. 56-46277).

When such a compound variable magnification exposure method is used, for example, when the copying magnification set by the imaging lens system is set to 1:1, the width direction of the document is set at 1:1, and the length direction is: This can be reduced or enlarged and copied. In other words, in the case of an original document having square-shaped information, the information can be converted into vertically or horizontally long rectangular information when copying.

By performing copying using such a compound variable magnification exposure method, a novel feel can be given to the copied image. Furthermore, when copying a legal size original onto A4 size 8-paper recording paper, the image on the original can be copied to an appropriate thickness corresponding to the aspect ratio r (r) of the recording paper.

By the way, in the composite variable magnification exposure method disclosed in the above-mentioned Japanese Patent Application Laid-open No. 56-46267, the difference Δm between the magnification in the longitudinal direction of the slit exposure section and the magnification in the direction orthogonal to this longitudinal direction is at most Δm= Approximately +0.1: W, and when 6 m becomes larger, there is a problem in that it is difficult to apply.

Therefore, the present invention solves these problems, allows a large vertical/horizontal zoom ratio, and can be realized with a simple device.
The purpose of this invention is to provide a new composite scaling N-element method.

The present invention will be explained below.

The main feature of the present invention is the use of an anamorphic lens in combination with an imaging lens system.

This anamorphic lens has a distorted image effect of a magnification of C in one direction and a magnification of m' in a direction perpendicular to this, and the direction of the same magnification corresponds to the longitudinal direction of the slit exposure section. , gft by an imaging lens system, placed in the optical path.

The speed ratio between the scanning speed for scanning the document with the slit and the exposure speed for exposing the photoreceptor to the slit is the magnification m of the imaging lens system.
and the magnification m' of the anamorphic lens. As a result, the size of the latent image formed on the photoreceptor is equal to the size of the original.

It is multiplied by m in the longitudinal direction of the slit exposure section, and multiplied by mm' in the direction perpendicular to this.

Hereinafter, specific examples will be explained with reference to the drawings.

FIG. 1 schematically shows only the parts necessary for explanation of an example of a copying apparatus embodying the present invention. In the figure, numeral 1 is the document placement glass, numeral I4 lamp, numeral 2゜3.4.5 is the mirror, numeral numeral is the imaging lens, numeral 7 is the photoreceptor, numeral 8 is the charger, and numeral 9 is the current "1". ″′”OId-Tk;'F;
f −, -9 “-・73”1) Cleaner, code 1
2 indicates a snow blower.

Further, the reference numeral O indicates an original, the reference numeral S indicates a recording paper, and the reference numeral 6 indicates an anamorphic lens group, which is one of the features of the present invention.

Among the mirrors 2, 3, 4.5, the mirror 5 is fixed, and the other mirrors 2, 3.4 are movable and can reciprocate in the left and right directions in the drawing. A lamp LP is integrated into mirror 2, and mirrors 3 and 4 are integrated with each other with respect to their movement.

Further, this copying apparatus is variable magnification, and is capable of variable magnification, reduction magnification, and enlargement magnification, and furthermore, two types of compound magnification can be combined for each of these magnifications. The imaging lens system occupies the position indicated by the symbol L1 at the same magnification. In addition, at the time of reduction magnification and enlargement magnification, the code L2 is used, respectively.
．． Occupy the position indicated by L3. Accordingly, mirror 3, 4
The starting positions are the positions 31 and 41 for the same magnification, the positions 32 and 42 for the reduced magnification, and the positions 33 and 43 for the enlarged magnification.

Before proceeding with the explanation of the features of the present invention, the outline of the copying process by the apparatus shown in FIG. 1 will be briefly explained.

When the original O is placed on the original placing glass 1 and the device is operated, the photoreceptor 7 starts rotating in the direction of the arrow, and the charger 8 uniformly covers the photoconductive layer surface of the photoreceptor 7. to be charged. During this time, the lamp LP emits light, and when the light emitting state becomes stable, the mirror 2 moves together with the lamp LP in the direction of the arrow to scan the document 0 through the slit. At the same time, mirror 3
and 4 move together in the direction of the arrow at a speed 1/2 of the moving speed of mirror 2.

The reflected light from the original O is reflected by mirrors 2, 3, 4 . The imaging lens system L1 passes through the mirror 5 and is placed on the photoreceptor 7, and an image of the slit-shaped portion of the document is formed on the photoreceptor 7 by the imaging action of the imaging lens system. The imaging section for the slit-shaped document partial image is a slit exposure section, and the longitudinal direction of this slit exposure section is a direction perpendicular to the drawing. Therefore, the direction perpendicular to the longitudinal direction is the moving direction of the circumferential surface of the photoreceptor 70. Note that since the source of the image forming on the slit exposure area is only the light reflected by the mirror 2, the width of the slit exposure area is regulated by the mirror 2.

By this slit exposure, the electrostatic latent image formed on the photoreceptor 7 is developed by the developing device #9, and the resulting visible image is transferred onto the recording paper S by the transfer charger IO. . The recording paper S to which the visible image has been transferred undergoes fixation of the visible image in a fixing device (not shown), and is then discharged from the apparatus as a copy. After the visible image has been transferred, the photoreceptor 7 has residual toner removed by a cleaner 7, and then static electricity is removed by a static eliminator 12.

On the other hand, the mirrors 2, 3.4 return to their starting positions after scanning the slit of the document. The copying process is thus completed.

Now, as shown in FIG. 2, the anamorphic lens group 6 mainly consists of three parts.

That is, the portion 60 is a flat plate-like portion, and is a portion where the optical bus is to be adjusted when compound magnification change is not performed.

The portion 61id is a cylindrical lens, and is an anamorphic lens having a unidirectional reduction distortion image effect. The portion 62 is a concave anamorphic lens and has a unidirectional magnifying distorted image effect. That is, the anamorphic lens group 6 includes an anamorphic lens 61 having a reduction distortion image effect and an anamorphic lens 62 having an enlargement distortion image effect. anamorphic lens 61
．． 62, their longitudinal magnification is, needless to say, the same magnification. This anamorphic lens group 6 is
This can be easily integrally molded from plastic.

The anamorphic lens group 6 is arranged so that its longitudinal direction corresponds to the longitudinal direction of the exposure portion, that is, in this example, parallel to the longitudinal direction.

As shown in FIG. 3, when compound magnification is not performed, the flat plate portion 60 is placed in the exposure path (FIG. 3 (■)), and when compound magnification is performed, the anamorphic lens 61 or 62 is placed at 11 in the optical path. (Figure 3 (II), (III)). When the anamorphic lens 6e is used, the aspect ratio of the image on the copy is reduced in the slit scanning direction of the original with respect to that of the image on the original. Conversely, when the anamorphic lens 62 is used, the aspect ratio of the image on the copy is enlarged in the slit scanning direction relative to that of the image on the original. Of course, the magnification in the longitudinal direction of the slit exposure length is the magnification of the imaging lens system.

Returning to FIG. 3 again, one end of the anamorphic lens group 6 is supported by the frame 70 by two link members 50 and 60. Code 51, 52゜61,
62 indicates an engaging means. The state of the retaining portion by these engaging means is rotatable.

Link members 50, 60. Frame 70. The anamorphic lens group 6 thus forms a parallel link mechanism.

A compressible spring 71 is hooked between one end of the link mechanism 60 and the frame 7o.

The bent portion 53 in the link member 50 is connected to the solenoid 5O.
The bent portion 63 of the link member 6o faces the solenoid 5OL2. The link members 50, 60 are magnetic, and when the solenoid 5OLI is energized, the bent portion 53 of the link member 50 is attracted to the solenoid 5OLI. At this time, anamorphic lens group 6
is moved in parallel to the side where the solenoid 5OLI is located, and the anamorphic lens 61 is placed in the exposure optical path (the third
Figure (■)). Conversely, when the solenoid 5QL2 is energized, the bending Vi563 of the link member 60
By being pulled by the OL2, the anamorphic lens 62 is placed in the exposure path (third concave dish). Solenoid 5OLI.

When both 5OL2 are not energized, the flat plate portion 60 is placed in the exposure optical path by the action of the spring 71a (FIG. 3(I)).

Now, let us say that the copying magnification set by the imaging lens system is ml for the same magnification, m2 for the reduction magnification, m3 for the maximum magnification, and the non-life magnification of the anamorphic lens 61. , respectively m1′.

Let's call it m2'. Then, in the case of this copying apparatus, the copying magnification in the direction in which the circumferential surface of the photoreceptor 7 moves, that is, in the direction corresponding to the slit scanning direction of the document, is 3 of ml, m2, and m3 when compound magnification is not performed. In addition to seeds, (m1]・(ml), (m
2)・(ml') r (m3)(ml'),
(ml) (m2').

(m2)・(m2'), (rn3)・(m2')
Since there are 6 types, there are 9 types of magnification.

As is well known, in order to properly perform slit exposure of the photoreceptor, it is necessary to appropriately determine the ratio between the slit exposure speed and the slit scanning speed of the document depending on the magnification.

This device example is designed so that the moving speed [V] of the circumferential surface of the photoreceptor 7 is constant.

Then, for each of the above nine cases, the manuscript ■ It is.

(m3) (m2) In this way, the slit scanning speed of the original is determined by whether compound magnification is to be performed, and if so, what is the magnification of the amorphous lens, and by the imaging lens system. Since it is uniquely determined by the magnification, the nine types of copying modes mentioned above can be selected, and the nine types of scanning speeds mentioned above can be stored in a microcomputer, etc., and the corresponding speed can be adjusted according to the selection of the copying mode. What is necessary is to read out the scanning speed to control the slit scanning of the document.

FIG. 4 schematically shows an example of a mechanism for moving the mirrors 2, 3.4. In the figure, symbols PI, P2, P3, P
4.

P5 is a pulley, W is a wire, Ml, M
2 indicates a motor. Pulley PI, P2
, P4 and P5 are arranged at fixed positions in the device space, but the boo IJ-P3 is movable in the left and right directions in the figure.

The wire W has one end fixed to the drive shaft of the motor M1, and is then wound around the drive shaft a necessary number of times, and the wire W is connected to the drive shaft of the motor M1.
-P1, then wrapped around the right peripheral surface of Boo IJ-P3, and further wrapped around the left peripheral surface of Boo IJ-P4. Furthermore, it is wound around the shaft of the motor M2 a necessary number of times and is fixed to the shaft of the motor M2. Then Boo IJ-P
5, it wrapped around the left circumferential surface of pulley P3 and boom! After passing through J-P2, the other end is fixed to the shaft of motor M1.

2 mirrors are fixed to wire 2. On the other hand, the supports for the mirrors 3 and 4 that move in one piece are
It is integrated into the 3rd axis.

To displace the mirrors 3 and 4 when switching the copying magnification set by the imaging lens system, the axial movement of the motor Ml is completely fixed, and the motor M2 is driven, thereby moving the pulley P3. This can be done by displacing it in the left-right direction as shown in FIG. At this time, mirror 2 does not move.

- When scanning a document, it is sufficient to fix the shaft of the motor M2 and drive the motor Ml. Then, mirror 2 moves left and right in FIG. 4, and mirrors 3 and 4 move as shown in FIG.
It moves at a speed of 172 times the moving speed of mirror 2. The motor M1 is a servo motor, and its rotational speed is controlled according to the nine types of scanning speeds described above.

In the above example, the amorphous lens is arranged on the object side of the imaging lens system, but it is also possible to arrange it on the object side of the imaging lens system.

[Brief explanation of drawings]

FIG. 1 is a front view schematically showing only the main parts of an example of a copying apparatus to which the present invention is applied, FIG. 2 is a perspective view showing the shape of an amorphous lens group and its displacement mechanism, and FIG. FIG. 4 is a front view showing an example of a mechanism for performing slit scanning of an original. L: Imaging lens system, 6: Amorphous lens group, 7: Photoreceptor.

Claims (1)

[Claims of Claims] In a slit exposure copying system, an anamorphic lens that has a distorted image effect of equal magnification in one direction and m' times in a direction perpendicular to this is installed in the exposure optical path by the imaging lens system. , arranged so that the direction of the same magnification corresponds to the longitudinal direction of the slit exposure section, and the rapid electric current ratio of the scanning stray electricity that scans the original with the slit and the exposure stray electricity that moves the photoreceptor through the slit N is imaged. Lens system magnification m
and the magnification m' of the anamorphic lens and the magnification m' of the lens, and the latent image corresponding to the document is placed on the photoconductor by m times in the longitudinal direction of the slit exposure section and mm' in the direction perpendicular to this.
A compound variable magnification exposure method for a photoreceptor, which is characterized by forming the photoconductor by varying the magnification.