JPS59216115A - Variable power optical system - Google Patents

Abstract

PURPOSE:To obtain a compact optical system by arraying plural spherical lenses for power variation for respective image-forming unit elements specified by the angular apertures of respective lens elements constituting an equivalant lens array. CONSTITUTION:A life-size image forming array device 1 is formed by cutting numbers of convergent optical transmitter elements 2 which are equal in optical condition such as a refractive index distribution and diameter to some specific length and arranging them so that their incidence end surfaces 21 and projection end surfaces 22 are close to each other in parallel, and the elements form one, two, or three arrays. A partial image 4a of part 3a of an object 3 is formed on a group of every 2-3 (or 5-6) elements, and such partial images are put together to form the life-size image 4 of the object 3. Then, each partial image 4a is the composite image of partial images 4a-1, 4a-2, and 4a-3 formed on each element 2.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a D variable magnification optical system for optical equipment such as an electrophotographic copying machine or a printer applying electrophotographic technology, a facsimile, an OHP, a league for microfilm, and a printer. The present invention relates to a variable magnification optical system using a same-magnification forged array device having a large number of lens elements arranged in a row.

(Prior art) As a full-size textile play device, Utility Model No. 49-11223
A large number of transparent focusing light transmitting elements whose refractive index changes parabolically in the radial direction, as shown in Publication No. 9, etc., are arranged close to each other in a row with their light incident and output end surfaces parallel to each other. At least two lens pieces in which a large number of lens elements are arranged in rows are stacked at a constant interval as shown in Japanese Patent Publication No. 49-8893, etc.; Japanese Unexamined Patent Publication 1983-1983
A telese/torinocle/zuarey as shown in the υOI month publication, a prism lens array or a roof mirror lens array as shown in Japanese Patent Application Laid-Open No. 57-37325, etc. are known.

These φ) imaging optical systems are all compound eyes, and the portions 1& imaged by the individual lens elements are synthesized as a single image on the image plane, so there are other refracting lenses in front of one image plane. It was thought that if the optical system was installed, each elephant would be separated and not imaged as a single unit, and therefore it would be impossible to change the magnification using other refractive lenses. However, for some reason, the applicant of the present application had previously
In JP-A No. 4343 and JP-A No. 54-154344, magnification can be changed by placing one concave or convex lens having an aperture angle that allows the entire array to be seen in front or behind the converging light transmitter array. I made it clear for the first time. This is an extremely powerful fact backed up by experiments.

In the above-mentioned prior invention by the present applicant, a converging optical transmitter array is used as the equal-magnification condensing array device, and a single spherical lens or a spherical lens system is used as the variable-length lens. Through subsequent research by the inventor, it was found that variable magnification was also possible by using other same-magnification textile arrays and multiple variable-magnification lenses arranged in a row in the same direction as the zero-magnification array. .

(Object of the Invention) Therefore, the object of the present invention is to provide a novel variable magnification optical system using a same-magnification condenser array device.

The above object of the present invention is to provide a plurality of spherical lenses for each imaging unit element defined by the aperture angle of each lens element constituting the array on the entrance end face (ill) and/or exit end face side of the equal-magnification focusing array device. is achieved by arranging them along the length of this array.

In the most preferred practical example of this invention, the plurality of variable/double-use spherical lenses have a shape in which a single spherical lens/lens having an aperture angle that allows viewing the entire array is divided along the length of the array.

In another actual case of this invention, the spherical lenses for variable magnification each have an A1 homogeneous optical property, and therefore the image formed by these lenses for variable magnification is Although it is not combined into one image, there are as many variable-magnification lenses as there are variable-magnification lenses, and this method is suitable for making multiple variable-magnification copies at the same time from the same original.

Furthermore, in another example of the present invention, a lens for variable magnification is provided in the optical path so that it can move forward and backward or be detached, so that it is possible to switch between equal magnification and various variable magnifications.

Hereinafter, the configuration of the present invention will be explained with reference to the accompanying drawings.

(Structure of the Invention) The gist of the present invention is to arrange a plurality of variable magnification spherical lenses for each imaging unit element defined by the aperture angle of each lens element constituting the equal-magnification lens array. First, this will be explained with reference to FIG. The equal-magnification imaging array device 1 cuts a large number of convergent light transmitting elements 2 to a predetermined length under optical conditions such as refractive index distribution and having the same diameter (17'), and cuts the incident end face 21 and the outgoing end thereof rI'j 122 are arranged close to each other in a row so that they are parallel to each other. The elements 2 are usually arranged in one row or -2 to three rows. The refractive index distribution constants used in electrophotography u't as the focusing light transmitting element i are U, U146 (190~o, o1946zs,
Opening angle is 4° to 6°, diameter is 0.8 to 1.21nrn,
If the conjugate length is about 64 mm) [if heavily used, object 3
In order to visualize it by closing it with a good 4° erect steel,
In the case of the I-row array 'r), a minimum of 2 to 3 adjacent lens elements 2 (5 to 6 in the case of the stacked 2-row array D) are required.

In other words, the object 30 part 3a weaves a partial image 4a for each 2-3 (or 5-6) element group 7.
, these partial 1 images are combined to create the same size 1 corresponding to object 3
Elephant 4 is formed. Each partial opening f4a also has a portion (1) 4a-■ connected by each element 2.
, 4a-2, 4a-3 and are arranged with the optical member 6 in between, one elephant will form a unified variable magnification image even though it is separated. This element group is referred to as a unit element in this specification.

As shown in the above-mentioned prior invention, various types of lenses that function as concave lenses or convex lenses are used for the spherical lens 5 for zooming, and f) the arrangement position can be changed in various ways. By doing so, it is possible to reduce the size of the corps and perform jl beta. In Fig. 2, by arranging the concave lens 5 between the array l and the equal-magnification gap position, an enlarged one-zoom 4' of the object 3 is obtained behind the textile position of the same-magnification one-zoom 4.

]・In Figure 3, the concave lens 5 is connected to the object position and the array l.
The equal can edge 4' of the reduced erect virtual image 3', which is disposed between the two and formed in front of the concave/zip 5, is formed in front of the normal same-magnification imaging position. In Figure 4, the protrusion/end 5 is placed between the array l and its same-magnification imaging position and 0, and the object 30
A reduced size 4' is formed behind the same size weaving position. In Figure 5, the convex lens 5 is placed between the object position and the array l, and the equal-magnification image 4' of the enlarged erect virtual image 3' formed in front of the convex lens 5 is the normal equal-magnification image 4'. It is formed behind the keiko position W.

The outer shape of the variable power lens 5 does not necessarily have to be circular, and may be a strip having a constant width in the direction across the array 1. A preferred shape for variable magnification is a single 0-spherical lens having an aperture angle that allows the entire length of the array to be divided into the above-mentioned imaging unit elements. Examples include various types of 7 as shown in Figure 6.
These lenses are Lennel type lenses, and are formed to have a constant width in the direction across the array I, as shown in Figure 7. In these cases, the pitch P of the annular zone of each lens corresponds to the above-mentioned threshold unit element. When molded from resin such as acrylic, this type of Fresnel lens has a nearly constant overall wall thickness of 0, with little molding distortion, and when used in a copying machine, etc., it is suitable for lighting lamps. Since there is little thermal deformation caused by such factors, the decrease in MTF at the lens circumference is small.

In the above configuration, the curvature or refractive index of each lens is adjusted from the center of the array 1 toward both rows so that the multiple zoom lenses 5a, etc. function as a single 0 spherical lens as a whole. This is the same as changing it sequentially, but another way to obtain the same effect is to change it starting from the center of the array l.
The focal length may be gradually increased toward both outer sides, so that the lens as a whole functions as one spherical lens.

When the plurality of lenses 5a, etc. do not act as a spherical lens as a whole, and when the plurality of lenses 5a, etc. are not divided into image forming unit elements, the variable magnification images are not combined and are separated. They do not form a unified image. However, if a plurality of lenses 5a etc. are divided into image forming unit elements and have the same lens performance, the variable magnification images are not combined into one, but the variable magnification images are not combined into one, but the variable magnification images are composed of as many independent variables as the number of lenses 5a A double image is formed. By making good use of this property, it is possible to make multiple copies of a single original at one time.

Further, if a mechanism is provided that allows various magnification changing lenses 5 to be put in and taken out of the optical path of this optical system, it is possible to perform various magnification changes including the same magnification. At this time, as shown in Fig. 8, if a variable magnification lens 5.5' with the same performance O is placed at the equivalent position of the array l'7) both sides and elevations, the object image will be reduced by the lens 5. 3' is magnified by lens 5' at the same magnification, a regular 1-magnification lens is formed on the M plane, and therefore by moving either variable magnification lens in or out of the optical path, It is possible to perform the same magnification, reduction, and enlargement. In the example shown in this figure, a reduced image can be obtained by removing the variable magnification lens 5' on the exit side of the array (1g).
It will be equivalent to Fang 3. ), an enlarged image can be obtained by removing the lens 5 on the incident side (equivalent to the 2° view).

When changing the magnification, the optical path length changes, so it is necessary to move the object plane or image plane to compensate for this, but in the case of copying, this is usually done by moving or switching the mirror. . When the variable magnification image is reshaped in front of the normal equal magnification (8) position 0, the variable magnified image 4' is regarded as an object as shown in Fig. 9, and it is transferred to another equal magnified textile array. If the device 2' focuses the image at the regular same-magnification position, there is no need to move the position of the photoreceptor when copying.

(Effects of the Invention) As described above, according to the variable magnification optical system of the present invention, since variable magnification can be performed using a same-magnification array device, the entire optical system can be designed very compactly. be able to. Furthermore, if the variable magnification lens is composed of a plurality of lenses having the same lens performance, there is a unique effect that it is possible to obtain variable magnification images corresponding to the number of lenses.

[Brief explanation of drawings]

Figure 1 shows a weaving state diagram for detailed explanation of this invention.
Figures 2 to 5 are threshold state diagrams showing different practical examples of this invention, and Figure 6 is a Fresnel type used in the invention of this invention.'7) Various 0 variable power lenses D Partial cross section,
Figure 7 is a top view of the paddle shown in Figure 6', and Figures 8 and 9 are schematic diagrams showing still another example of the paddle of the present invention. DESCRIPTION OF SYMBOLS 1... Equal-magnification condensation array device, 2... Lens element, 3
...object, 4.image, 5.variable magnification lens, 6.
...Go to light-shielding member Figure G Figure 7 Figure 8 Figure f (, 3ε correction officer (voluntary) January 110, 1980 Commissioner of the Japan Patent Office Kazuo Wakasugi 1 Indication of the case 1988 Patent Application No. 90971, Name of the invention: Variable power optical system 3 Relationship with the person making the correction Case Name of patent applicant (G74) Ricoh Co., Ltd. 4th generation
Address: 4-5-4 Kyodo, Setagaya-ku, Tokyo "
The following sections of ``Claims'', ``Detailed Description of the Invention'', and ``Brief Description of Drawings'' and the claims in Figure 111s of Drawing (1) are corrected as shown in the attached sheet. (2) From the first line to the second line of page 5, "defined by the aperture angle of the element" is changed to "predetermined by the element." (3) Add "independent" next to "sokuzore" in line 10 of the 5th W. (4) On page 6, line 4, Q and line 5, "defined by the aperture angle of the element" is replaced by "predetermined by the element".
to press] (5) It may also be the item r listed on page 8, line 13. ” is effective for Surirami exposure copying machines. ” is corrected. (6) "Doing" at the beginning of the second line on page 9 is [doing], but even if this does not match, the image will not fall apart. ] to correct. (7) Delete [and the case where a plurality of lenses 5a, etc. are not divided into imaging unit elements] from lines 17 to 18 on page 9. 8) Delete "etc. ga" at the beginning of the first line of the same page 10 to "naiga," at the beginning of the third line, and replace it with "etc. independently have the same lens performance and as a whole. - When acting as a lens system, substitute ". (9) "It is possible" in the 6th line of page 10 of the same page should be changed to "It is possible to copy from one original to several damaged leaves in one cycle, and to make many copies simultaneously on slips, cards, etc." It is possible to make copies.” (10) At the beginning of line 8 on page 10, add ``turret style'' after ``rouchi ni''. (11) "Reduction and enlargement" in line 16 of page 10 is corrected to "reduction and or enlargement." (12) Add the following sentence after "It will disappear." at the end of line 10 on page 11. ``Also, although there is no example in conventional copying machines, if the document table, which is the object surface, is moved in the optical axis direction, a separate equal-magnification imaging array device 2' becomes unnecessary, so the optical system In addition, as shown in FIG. 10, when switching between equal magnification and variable magnification using the optical system shown in FIG. Sometimes, by arranging a transparent high refractive index plate material 7 on the output side of the array 1, it is possible to image the 1-magnification image 4 at the position of the variable-magnification image 4I when the lens 5 is present. , when switching between 1x and 18x copying machines,
Copying becomes possible without changing the position of the photoreceptor, which is the imaging surface. As the variable magnification increases, the moving distance rfiI of the variable magnification image 4I from the normal magnification image 4 also increases, but this moving distance can be absorbed by overlapping a number of high refractive index plates 7. I can do it. Such an effect can be similarly obtained even if the high refractive index plate material 7 is arranged on the incident side of the array 1. In an optical system in which the variable magnification image 41 is formed at a position outside the 1g image 4, such as the optical system shown in FIGS. 2, 4, and 5, such a high refractive index plate 7 is used. By inserting the variable magnification image 4I into either the exit side or the incidence side of the array 1 during magnification change, the variable magnification image 4I can be formed at the position of the same-magnification image 4. In this way,
An extremely practical optical system for a variable magnification copying machine that does not require changing the position or distance between the original surface and the photosensitive surface when switching between equal magnification and variable magnification can be obtained. (13) Same page 11, No. 1
At the end of the 6th line, after “Construction file, ba,”
Change your stance. 2 and 1, these lenses are 1
By exchanging a complete set, join ``. (14) Figure 9A is a front view of the variable power lens shown in Figure 9, and Figure 10 is a front view of the variable power lens shown in Figure 9. FIG. 3 is an imaging state diagram showing another embodiment of the invention. (15) At the beginning of the 9th line on page 12, after “material”, “, 7.
...Add high refractive index plate material. (1G) Figures 1 to 5, 23, and 9 of the drawings
Replace the diagram with the attached one. (17) Add attached Figures 9A and 10 to the drawings. Attachment Claim 1: A 1-magnification imaging array device having a large number of lens elements arranged in a row; A variable magnification optical system comprising a variable lens made of a plurality of spherical lenses arranged along the longitudinal direction of the array device on the end face side. 2. The plurality of spherical lenses are capable of synthesizing a single image on the image plane (a claim in which the curvature, refractive index, or focal length decoupling is sequentially different from the center of the array device toward the outside of the plane) The variable magnification optical system according to item 1. 3. The plurality of spherical lenses have a shape obtained by dividing a single spherical lens having a frontage angle that allows the entire length of the array device to be divided along the longitudinal direction of the array device. 4. The variable magnification optical system according to claim 2. 4. The scope of claim 4, wherein the plurality of spherical lenses have the same lens performance so as to image a plurality of elephants of the same size on the image plane. The variable magnification optical system according to claim 1. 5. The variable magnification optical system according to claim 1, in which the variable 1g lens can be inserted into and taken out from its optical path. 6. The variable magnification optical system according to claim 1, wherein the variable magnification lens can be inserted into and taken out from the optical path thereof. Claim 1 in which another equal-magnification imaging array device is interposed between the imaging positions.
Variable magnification optical system described in Section 2. Figure 10

Claims (1)

[Scope of Claims] 1. An equal-magnification condensation array device having a large number of lens elements arranged in a row, and a condensation unit element defined by an aperture angle of each of the lens elements. The array mounting portion φ is provided on the input end face side and/or the output end face side of the array arrangement.
) A variable power optical system including a variable power lens consisting of a plurality of spherical lenses arranged along the longitudinal direction. 2. Aif: A plurality of spherical lenses have different curvatures, refractive indexes, or distances in order from the center of the array device toward the outer sacrum in order to synthesize a single image in one quadrant. Claims: 1-door self-mounted variable magnification optical system. 6. The spherical lens is a single 0 spherical lens having an aperture angle that allows the entire length of the 1" array to fit into the eye 11.
The variable magnification optical system according to claim 7), which has a shape in which the lens is divided along the longitudinal direction of the array device. 4. The zero-variable magnification optical system as claimed in claim 1, wherein the plurality of spherical lenses have the same lens performance so as to weave a plurality of irons of the same size on the iron surface. 5. A 0-variable magnification optical system as described in Jy 1 (d), in which the front 81 magnification variable lens can be taken in and out of its optical path. 6. A variable magnification optical system in claim 1, ff+F, in which a magnification array device is interposed between the variable magnification iron weaving position and the same magnification iron weaving position housing.