CN101372179A - Line head and image forming apparatus using the same - Google Patents

Line head and image forming apparatus using the same Download PDF

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Publication number
CN101372179A
CN101372179A CNA2008102110744A CN200810211074A CN101372179A CN 101372179 A CN101372179 A CN 101372179A CN A2008102110744 A CNA2008102110744 A CN A2008102110744A CN 200810211074 A CN200810211074 A CN 200810211074A CN 101372179 A CN101372179 A CN 101372179A
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CN
China
Prior art keywords
lens
light
positive lens
line head
face
Prior art date
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Granted
Application number
CNA2008102110744A
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Chinese (zh)
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CN101372179B (en
Inventor
宗和健
野村雄二郎
小泉龙太
井熊健
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Seiko Epson Corp
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Seiko Epson Corp
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Publication date
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Publication of CN101372179A publication Critical patent/CN101372179A/en
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Publication of CN101372179B publication Critical patent/CN101372179B/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/435—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material
    • B41J2/447—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material using arrays of radiation sources
    • B41J2/45—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material using arrays of radiation sources using light-emitting diode [LED] or laser arrays
    • B41J2/451—Special optical means therefor, e.g. lenses, mirrors, focusing means
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
    • H04N1/12—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using the sheet-feed movement or the medium-advance or the drum-rotation movement as the slow scanning component, e.g. arrangements for the main-scanning
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
    • H04N1/19—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using multi-element arrays
    • H04N1/191—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using multi-element arrays the array comprising a one-dimensional array, or a combination of one-dimensional arrays, or a substantially one-dimensional array, e.g. an array of staggered elements
    • H04N1/1911—Simultaneously or substantially simultaneously scanning picture elements on more than one main scanning line, e.g. scanning in swaths
    • H04N1/1912—Scanning main scanning lines which are spaced apart from one another in the sub-scanning direction
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N2201/00—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof
    • H04N2201/0077—Types of the still picture apparatus
    • H04N2201/0082—Image hardcopy reproducer

Abstract

The invention provides a line scanning head including: a positive lens system (5) having two lenses (L1,L2) with positive refractive power; a lens array in which a plurality of the positive lens systems (5) are arrayed in a first direction; a light emitter array in which a plurality of light-emitting elements are arrayed on an object side of the lens array so as to correspond to the one positive lens system (5); and an aperture plate (11) that forms an aperture diaphragm at the position of an object-side focal point of the positive lens system (5). An object-side surface of an object-side lens (L1) of the positive lens system (5) is positioned close to the object-side focal point. Thereby unevenness caused by positional deviation of light-emitting dot images does not occur in an optical writing line scanning head, in which a plurality of light-emitting elements are arrayed in rows corresponding to each lens of a plurality of positive lens arrayed in a line shape, and concentration unevenness, which is caused by shading, between imaging spots formed by each lens does not occur neither.

Description

Line head and the image processing system that uses it
Technical field
The image processing system that the present invention relates to line head and use it particularly, relates to and uses microlens array that columns of light elements is projected to plane of illumination with line head that forms the imaging facula row and the image processing system that uses it.
Background technology
In the past, patent documentation 1 has proposed a kind of smooth writing line probe, it disposes a plurality of led array chips on the led array direction, the positive lens that disposes with the led array of corresponding each led array chip amplifies and projection on photoreceptor, on photoreceptor, make adjacent led array chip the end luminous point picture each other with the picture of the luminous point of same led array chip between the identical adjacent and imaging of spacing of spacing, and make the opposite light of its light path read line head.
In addition, patent documentation 2 has proposed with the configuration as patent documentation 1, constitutes positive lens with 2 pieces of lens, makes the depth of focus darker according to the mode that makes projected light near directional light.
In addition, patent documentation 3 has proposed a kind of smooth writing line probe, it is across gap configuration 2 row led array chips, make its phase shifting half period repeatedly, make each led array chip dispose 2 row positive lens arrays, thereby make the picture of the luminous point array on the photoreceptor become 1 row corresponding to each positive lens.
Patent documentation 1: 2-No. 4546 communiques of Japanese kokai publication hei
Patent documentation 2: 6-No. 344596 communiques of Japanese kokai publication hei
Patent documentation 3: 6-No. 278314 communiques of Japanese kokai publication hei
In these prior aries, even on the resonable imagination face, be equidistantly consistent between the picture of luminous point array, but if make image planes move forward and backward at the optical axis direction of lens because of the vibration of photoreceptor etc., then the position of the luminous point on the photoreceptor produces and to depart from, and can produce uneven (the spacing inequality of main scanning direction) in the luminous point array relatively moves spacing between the scan line that scans along sub scanning direction.
And then, if the visual angle of each positive lens increases, then follow cosine 4 power rules, light quantity on every side reduces and becomes big (shade: シ ェ-デ ィ Application グ).Though for the density unevenness of the lettering image that prevents to cause the light quantity of each pixel (luminous point picture) of image planes is fixed, like this, must proofread and correct shade in the light quantity that each luminous point changes light source (luminous point) by this shade.But, because the luminous intensity of light source pixel (luminous point) can have influence on life characteristic, so, initially obtain uniform image planes light quantity even when the shade of optical system becomes big, each luminous point is adjusted light quantity, but As time goes on, can produce the light quantity inequality of luminous point spacing, form the image color inequality.
Summary of the invention
The present invention proposes in view of such problem of the prior art just, its purpose is, in the light writing line probe of a plurality of light-emitting components of and configuring arrange shape corresponding with each positive lens of a plurality of positive lens that dispose with array-like, even the face that writes in the optical axis direction change, can not produce the inequality based on the position deviation of luminous point picture yet.Another object of the present invention is between the imaging facula based on each lens, prevents to produce the density unevenness that is caused by shade.
In addition, the object of the present invention is to provide a kind of image processing system that uses such light writing line probe and make the light of its light path contrary read line head.
Reach the line head of the present invention of above-mentioned purpose, possess: the positive lens system, it has the lens of two positive refracting powers; Lens arra, it disposes a plurality of described positive lens system in the 1st direction; Luminous body array, its object side at described lens arra has a plurality of light-emitting components with respect to 1 described positive lens system configuration; And aperture plate, it forms the aperture diaphragm of position of the object side focus of described positive lens system, and the face of the object side of the lens of the object side of described positive lens system is positioned at the position of approaching described object side focus.
By such formation,, can not produce inhomogeneous based on the position deviation of luminous point picture even the face that writes changes at optical axis direction yet, in addition, can reduce to reduce the influence of shade, and can prevent the deterioration of the image that forms from the visual angle of a plurality of light-emitting components to the incident of positive lens system.
In addition, be preferably, the face of the object side of the lens of the object side of described positive lens system, with respect to described object side focus, be positioned at described positive lens system synthetic focal length ± 10% scope.
By such formation,, can essence do not produce inhomogeneous based on the position deviation of luminous point picture even the face that writes changes at optical axis direction yet, in addition, can reduce to reduce the influence of shade, and can prevent the deterioration of the image that forms from the visual angle of a plurality of light-emitting components to the incident of positive lens system.
In addition, described lens can be made of set of lenses.
By such formation, not only the manufacturing transfiguration of each lens arra is easy, carries out aberration correction and also becomes easy.
In addition, also can, in described two lens, the face as side of the lens of object side is made of the plane.
By such formation,,, can further reduce the influence of shade so can further dwindle the visual angle owing to further enlarged interarea from the front side of the lens of picture side to the interval of the back survey interarea of the lens of object side.In addition, compare with the lens of curvature, have only 1 because the formation of the curved surface of the lens of object side becomes, so advantage easy to manufacture is arranged compared with the two sides.
In addition, also can be, the face of the object side of the lens of the object side of described at least positive lens system be made of convex surface, and the part that comprises the face top of this convex surface is absorbed in the aperture of described aperture plate and disposes.
By such formation,,, can further reduce the influence of shade so can further dwindle the visual angle owing to further enlarged interarea from the front side of the lens of picture side to the interval of the back survey interarea of the lens of object side.
In this case, can be on the face of the object side of described lens arra, to form the light-proofness parts and constitute described aperture plate.
By such formation, by at the integrally formed aperture plate of lens surface, the position of aperture plate determines that assembling becomes easily, in addition, can suppress the center of diaphragm and departing from of lens axis based on thermal expansion.
In addition, be preferably, the face as side as the lens of side of described at least positive lens system is made of the plane.
By such formation, can make the exit facet from the nearest lens of image planes is the plane, and can clean the foreign matter of the ash that is attached to this exit facet or toner etc. simply, has improved spatter property.
In addition, be preferably, the shape of described aperture diaphragm is the shape that at least aperture of described the 1st direction is limited.
By such formation, the position deviation that can tackle at least the outer imaging facula of axle becomes the main scanning direction of problem.
In addition, be preferably, described a plurality of light-emitting components form the described columns of light elements of arranging a plurality ofly on the 2nd direction vertical with the 1st direction.
By such formation, can form corresponding with the higher image of the density of imaging facula.
In addition, be preferably, the mode across illuminator group at interval disposes described a plurality of light-emitting components on the 1st direction to be formed on.
By such formation, can form corresponding with the higher image of the density of imaging facula.In addition, can avoid the picture of the end luminous point in each a plurality of light-emitting component because the influence of ケ ラ レ causes the light quantity reduction.
In addition, be preferably, described light-emitting component is made of organic EL.
By such formation, can form corresponding with uniform image in the face.
In addition, be preferably, described light-emitting component is made of LED.
By such formation, also can be corresponding with use led array line head.
In addition, can constitute a kind of image processing system, it carries the image that is provided with at least more than 2 of holding body on every side at picture and forms platform, forming platform configuration at described image has charged mechanism, above such these each images of line head, developing mechanism and transfer means to form the unit of usefulness, offset medium carries out image with series system thus and forms by each platform.
By such formation, can constitute image processing systems such as printer small-sized, that resolution ratio is high, the deterioration of image is less.
The present invention also comprises following line head, possesses:
The positive lens system, it has two lens of positive refractive power;
Lens arra, it disposes a plurality of described positive lens system in the 1st direction;
The photoreceptor array, it has a plurality of photo detectors as side with respect to 1 described positive lens system configuration described lens arra; And
Aperture plate, it forms the aperture diaphragm of position of the picture side focus of described positive lens system;
The face as side as the lens of side of described positive lens system is positioned at the position of approaching described picture side focus.
By such formation, read in the line head at light, even producing at optical axis direction, the position of reading face departs from, can not produce yet and read uneven position deviation, in addition, can dwindle from photo detector to the visual angle of positive lens system, reduce the influence of shade, can prevent the deterioration of reading images with the incident of backlight road.
In addition, each the positive lens system that constitutes lens arra also can have 2 lens groups of positive refractive power to constitute, and forms the synthetic lens combination that these 2 lens groups of serving as reasons constitute.
Description of drawings
Fig. 1 is the stereogram with 1 corresponding part of lenticule of the related line head of an embodiment of the invention.
Fig. 2 is the stereogram with 1 corresponding part of lenticule of the related line head of an embodiment of the invention.
Fig. 3 is the stereogram with 1 corresponding part of lenticule of the related line head of an embodiment of the invention.
Fig. 4 is the related luminous body array of expression 1 embodiment of the present invention and the optics multiplying power key diagram for negative lenticular corresponding relation.
Fig. 5 is the key diagram of example of storage list of the row buffer (line buffer) of expression storing image data.
Fig. 6 is the key diagram that is illustrated in the situation that main scanning direction forms at same column based on the imaging facula of the light-emitting component of odd indexed and even number sequence number.
Fig. 7 is the key diagram of expression as the summary of the example of the luminous body array of line head use.
Fig. 8 is illustrated in the formation of Fig. 7 by the output light of each light-emitting component to shine the key diagram that picture carries the image space under the situation of the plane of exposure of holding body by lenticule.
Fig. 9 is the key diagram that is illustrated in the state of sub scanning direction formation imaging facula among Fig. 8.
Figure 10 is under the lenticular situation of a plurality of arrangements of expression, carries the key diagram that the main scanning direction upset of holding body forms the example of imaging facula at picture.
Figure 11 schematically shows the sectional view of use based on the integral body formation of an embodiment of the image processing system of electrophotographic processes of the present invention (プ ロ セ ス).
Figure 12 is the figure that is used to illustrate basic principle of the present invention.
Figure 13 is the figure of definition of the symbol of each parameter of expression.
Figure 14 is the figure at the visual angle of the end light-emitting component of lens combination when the picture side heart far away that be made of the 1st positive lens and the 2nd positive lens of expression.
Figure 15 is that expression constitutes the figure based on the formation of the situation of optical system of the present invention by thin (thin meat) lens combination.
Figure 16 is the stereogram that the part of the formation of the light writing line probe of expression an embodiment of the invention is cut off.
Figure 17 is the sectional view of obtaining along the sub scanning direction of Figure 16.
Figure 18 is the vertical view of the configuration of the luminous body array of situation of expression Figure 16 and microlens array.
Figure 19 is the figure of the corresponding relation of 1 lenticule of expression and the illuminator module corresponding with it.
Figure 20 be the diaphragm that disposes corresponding to the illuminator module of luminous body array (
Figure A200810211074D0009154553QIETU
り) the vertical view of plate.
Figure 21 is the figure in the corresponding aperture of aperture plate of expression and 1 illuminator module.
Figure 22 is configured to the long line shape with light-emitting component at main scanning direction, by a part is wherein carried out light emitting control when constituting the illuminator module with the corresponding figure of Figure 18.
Figure 23 carries the overlapping example that exposes in end that is listed in of holding the imaging facula that makes adjacent illuminator module on the body to the quantity that increases the light-emitting component that constitutes the illuminator module at picture to carry out illustrated figure.
Figure 24 is the sectional view of obtaining along main scanning direction when constituting microlens array by 2 pieces microlens array.
Figure 25 is corresponding to the main scanning direction of 1 lenticular optical system of embodiment 1, the sectional view of sub scanning direction.
Figure 26 is corresponding to the main scanning direction of 1 lenticular optical system of embodiment 2, the sectional view of sub scanning direction.
Figure 27 is corresponding to the main scanning direction of 1 lenticular optical system of embodiment 3, the sectional view of sub scanning direction.
Figure 28 is the sectional view of obtaining along main scanning direction that constitutes the example that forms diaphragm on the face of object side of the 1st microlens array of lenticular lens arra in embodiment 3.
Figure 29 is and the main scanning direction of 1 corresponding optical system of lenticule of embodiment 4, the sectional view of sub scanning direction.
Figure 30 is in the optical system of smooth writing line probe of the present invention, separates the sectional view of obtaining along main scanning direction of the example of other solar flare (the Off レ ア) aperture plate of configuration with aperture plate.
Among the figure: O-O '-lens axis, F-lenticular front side focus, 1-luminous body array, 2-light-emitting component, 2x-end light-emitting component or end photo detector, 2 '-light-emitting component relevant with the formation of imaging facula, 2 "-not make its luminous light-emitting component; 2a-at picture carries and to hold light-emitting component on the body that imaging facula is overlapping; 3-columns of light elements; 3 '-in the columns of light elements of the continuous long line shape of main scanning direction; 4-illuminator module; 5-lenticule, 6-microlens array, 8,8a, 8b-imaging facula, the imaging facula of 8x-end light-emitting component, the position of the imaging facula of the end light-emitting component of 8x '-when photoreceptor departs from, 8x " the position of the imaging facula of the end light-emitting component when-light-emitting component configuration plane departs from; 10-storage list; 11-aperture diaphragm; 12-chief ray; 20-glass substrate; 21-rectangular housing, 22-receiving orifice, 23-lining lid, 24-standing finish, 25-alignment pin, 26-patchhole, 27-containment member, 30-aperture plate (diaphragm), the aperture of 31-aperture plate, 32-solar flare (Off レ ア) aperture plate, the aperture of 33-flare aperture plate, 34-glass substrate, 35-lens face, 41-photoreceptor (holding body) or reading face as carrying, 41 '-deviation position of photoreceptor (holding body) as carrying, 41 (K, C, M, Y)-and photoconductor drum (holding body) as carrying, 42 (K, C, M, Y)-and charged mechanism (corona charging device), 44 (K, C, M, Y)-developing apparatus, 45 (K, C, M, Y)-the primary transfer roller, 50-intermediate transfer belt, 51-driven roller, 52-driven voller, 53-jockey pulley, 55-light-emitting component configuration plane, 55 '-deviation position of light-emitting component configuration plane, 61-the 1 microlens array, 62-the 2 microlens array, 66-secondary transfer roller, 71-the 1 liner, 72-the 2 liner, 73-the 3 liner, 101,101K, 101C, 101M, 101Y-line head (light writing line probe), L1-the 1st (just) lens, L2-the 2nd (just) lens
The specific embodiment
Describe in detail line head of the present invention (ラ イ Application ヘ Star De) give optical system before, earlier the configuration and the luminous moment that this light-emitting component is described described.
Fig. 4 is the related luminous body array 1 of expression 1 embodiment of the present invention and the optics multiplying power key diagram for the corresponding relation of negative lenticule 5.In the line head of this embodiment, the light-emitting component of 1 lenticule 5 corresponding 2 row.But, because lenticule 5 is optics multiplying power image-forming components for negative (handstand imaging), so the position of light-emitting component is in main scanning direction and sub scanning direction upset.Promptly in the formation of Fig. 1, the upstream side (the 1st row) that carries the moving direction of holding body at picture is arranged the light-emitting component (8,6,4,2) of even number sequence number, and its downstream (the 2nd row) arrange the light-emitting component (7,5,3,1) of odd indexed.In addition, arrange the bigger light-emitting component of sequence number in the side foremost of main scanning direction.
Fig. 1～Fig. 3 is 1 the corresponding stereogram of lenticular part with the line head of this embodiment.As shown in Figure 2, carry the imaging facula 8a that holds body 41, be formed at position in the main scanning direction upset with the light-emitting component 2 corresponding pictures that are arranged in as the odd indexed of carrying the downstream of holding body 41.R carries the moving direction of holding body 41 for picture.In addition as shown in Figure 3, carry the imaging facula 8b that holds body 41, be formed at position in the downstream of sub scanning direction upset with the light-emitting component 2 corresponding pictures that are arranged in as the even number sequence number of carrying the upstream side (the 1st row) of holding body 41.But, on main scanning direction, from the sequence number of the corresponding light-emitting component 1～8 of sequence of positions of the imaging facula of side foremost.Therefore, as can be known in this example,, can form imaging facula at same column at main scanning direction by adjusting the moment that picture carries the imaging facula formation of the sub scanning direction of holding body.
Fig. 5 is the key diagram of example of storage list 10 of the row buffer of expression storing image data.The storage list 10 of Fig. 5 is stored at main scanning direction turningly with respect to the sequence number of the light-emitting component of Fig. 4.In Fig. 5, from the view data of the storage list 10 that is stored in row buffer, at first, read the 1st view data (1,3,5,7) that corresponding picture carries the light-emitting component of the upstream side (the 1st row) of holding body 41, make light-emitting component luminous.Then, after the time, read corresponding stored, make it luminous in the 2nd view data (2,4,6,8) that the picture of memory address carries the light-emitting component in the downstream (the 2nd row) of holding body 41 at T.Like this, shown in 8 position among Fig. 6, be formed at same row with the 2nd imaging facula that is listed as at main scanning direction as carrying the imaging facula of holding the row of the 1st on the body.
Fig. 1 is the stereogram that the example that forms imaging facula in the moment of Fig. 5 reads image data is conceptually represented.As the explanation of reference Fig. 5, the light-emitting component of the upstream side (the 1st row) that picture is carried hold body 41 is luminous, carries at picture and is holding body 41 and form imaging faculas.Then, behind the moment T through regulation, the illuminator machine of the odd indexed in the downstream (the 2nd row) that picture is carried hold body 41 is luminous, carries at picture and is holding body and form imaging facula.At this moment, the imaging facula that is produced by the light-emitting component of odd indexed is in the position of the 8a of Fig. 2 explanation, as shown in Figure 6, is formed at 8 position at the main scanning direction same column.
Fig. 7 is the key diagram of expression as the summary of the example of the luminous body array of line head use.In Fig. 7, at luminous body array 1, will be provided with a plurality ofly at sub scanning direction in the columns of light elements 3 of a plurality of arrangement light-emitting components 2 of main scanning direction, and form illuminator module 4 (with reference to Fig. 4).In the example of Fig. 7,, on sub scanning direction, form 2 row (with reference to Fig. 4) in the columns of light elements 3 of arranging 4 light-emitting components 2 on the main scanning direction about illuminator module 4.Should a plurality of illuminator modules 4 be disposed at luminous body array 1, each illuminator module 4 corresponding lenticule 5 disposes.
A plurality of lenticules 5 are arranged at the main scanning direction and the sub scanning direction of luminous body array 1, form microlens array (MLA) 6.Make this MLA6 on sub scanning direction, stagger main scanning direction position foremost and arrange.The arrangement of such MLA6 is with light-emitting component is arranged to staggered situation on luminous body array 1 corresponding.In the example of Fig. 7, though MLA6 at sub scanning direction configuration 3 row, for the facility that illustrates, will divide into group A, group B, group C with the corresponding constituent parts modules 4 in each position of 3 row of the sub scanning direction of MLA6.
As above-mentioned, in being the lenticule of bearing 5, the optics multiplying power disposes a plurality of light-emitting components 2, and, at these lens under the situation of a plurality of configurations on the sub scanning direction, form the imaging facula that forms a line in order to carry the main scanning direction of holding body 41 at picture, need following view data control: the upset of (1) sub scanning direction, the upset of (2) main scanning direction, (3) the luminous moment of the multiple row light-emitting component in the lens is adjusted, and the luminous moment of the light-emitting component between (4) group is adjusted.
Fig. 8 is illustrated in the output light that utilizes each light-emitting component 2 in the formation of Fig. 7 to shine the key diagram that picture carries the image space under the situation of the plane of exposure of holding body by lenticule 5.In Fig. 8,,, dispose the single-bit module 4 of dividing into group A, group B, group C at luminous body array 1 as in Fig. 7 explanation.Each columns of light elements of organizing the single-bit module 4 of A, group B, group C is divided into picture carries upstream side (the 1st is listed as) and downstream (the 2nd row) of holding body 41, distribute the light-emitting component of even number sequence number at the 1st row, at the light-emitting component of the 2nd row distribution odd indexed.
For group A, by make each light-emitting component 2 action as Fig. 1～Fig. 3 explanation, carry at picture and hold body 41, form imaging facula in the position of main scanning direction and sub scanning direction upset.Like this, carry at picture and to hold on the body 41, form imaging facula with 1～8 order in the same column of main scanning direction.Below, picture is carried hold body 41 mobile official hour on sub scanning direction, the processing of the B of execution group similarly.And then, hold body 41 mobile official hour on sub scanning direction by picture is carried, the processing of execution group C, in the same column of main scanning direction with 1～24 ... order, form imaging facula based on the view data of input.
Fig. 9 is in Fig. 8, the key diagram of the state that the imaging facula of vice scanning direction forms.S is that picture carries the translational speed of holding body, d1 is the 1st row of group A and the interval of the 2nd light-emitting component that is listed as, d2 is the 2nd light-emitting component that is listed as of group A and the interval of organizing the 2nd row light-emitting component of B, d3 is the interval of the light-emitting component of the 2nd light-emitting component that is listed as of group B and the 2nd row of organizing C, T1 be the luminous back of the 2nd row light-emitting component of group A to the light-emitting component of the 1st row the time till luminous, the image space of light-emitting component that T2 is based on the 2nd row of group A moves to time of image space of light-emitting component of the 2nd row of group B, and the image space of light-emitting component that T3 is based on the 2nd row of group A moves to time of image space of the light-emitting component of group C.
T1 can try to achieve as following.For T2, T3, by d1 being replaced to d2, d3, equally can in the hope of.
T1＝|(d1×β)/S|
Here, each parameter is as follows.
D1: the distance of the sub scanning direction of light-emitting component;
S: the translational speed of imaging surface (holding body) as carrying;
β: the multiplying power of lens.
In Fig. 9, at the T2 of luminous time of light-emitting component of the 2nd row of group A after the time, make the light-emitting component of the 2nd row of group B luminous.And then, beginning from T2 to T3 after the time, make the 2nd light-emitting component that is listed as of group C luminous.Light-emitting component of the 1st row of each group is in that luminous to play T1 luminous after the time from the light-emitting component of the 2nd row.By such processing, as shown in Figure 8, can make imaging facula form row on the body as carrying to hold based on the illuminator of two-dimensional arrangement on luminous body array 1.Figure 10 is arranging under the situation of a plurality of lenticules 5, to carry the key diagram that example that the main scanning direction upset of holding body forms imaging facula is represented at picture.
Can utilize as above line head comes composing images to form device.In an one embodiment, with 4 line heads 4 photoreceptors are exposed, form the image of 4 looks simultaneously, can use as above line head at the tandem color printer (image processing system) of an endless intermediate transfer belt (intermediate transfer medium) transfer printing.Figure 11 is that expression uses organic EL to form the vertical disconnected sectional view of 1 example of device as the tandem type image of light-emitting component.This image processing system is disposed at 4 photosensitive drums (holding body as carrying) 41K, the 41C with corresponding same formation, the exposure position of 41M, 41Y respectively with 4 line head 101K, 101C, 101M, the 101Y of same formation, as the image processing system formation of series system.
As shown in figure 11, this image processing system is provided with driven roller 51, driven voller 52 and jockey pulley 53, apply tension force and open by jockey pulley 53 and establish (Zhang frame), have the intermediate transfer belt (intermediate transfer medium) 50 that drives to the diagram direction of arrow (counterclockwise) circulation.As carrying the outer peripheral face of holding body with 4 pictures of arranged spaced of regulation, dispose photoreceptor 41K, 41C, 41M, 41Y with photosensitive layer with respect to intermediate transfer belt 50.
Additional K, C, M, Y means black, blue or green (シ ア Application), pinkish red (マ ゼ Application ), Huang respectively behind above-mentioned symbol, represents photoreceptor black, blue or green, pinkish red, yellow usefulness respectively.Member for other is also identical.Make the driving of photoreceptor 41K, 41C, 41M, 41Y and intermediate transfer belt 50 synchronous, drive to the illustrated direction of arrow (clockwise) rotation.Around each photoreceptor (K, C, M, Y), be provided with: the similarly charged charged mechanism (corona charging device) 42 (K, C, M, Y) of outer peripheral face that makes each photoreceptor 41 (K, C, M, Y): and the of the present invention above-mentioned line head 101 (K, C, M, Y) that similarly charged outer peripheral face carries out line scanning to utilizing this charged mechanism 42 (K, C, M, Y) synchronously and successively with the rotation of photoreceptor 41 (K, C, M, Y).
In addition, have: developing apparatus 44 (K, C, M, Y), its to the electrostatic latent image that forms by this line head 101 (K, C, M, Y) invest as developer toner (toner) but and form video (toner picture); Primary transfer roller 45 (K, C, M, Y), it is the transfer means of intermediate transfer belt 50 transfer printings to the primary transfer object as the toner picture that will be developed by this developing apparatus 44 (K, C, M, Y) successively; And cleaning device 46 (K, C, M, Y), the cleaning mechanism that it is removed as the toner that will residue in the surface of photoreceptor 41 (K, C, M, Y) after transfer printing.
Here, each line head 101 (K, C, M, Y) is provided with according to the array direction of line head 101 (K, C, M, the Y) mode along the bus of photoconductor drum 41 (K, C, M, Y).And, set with the roughly consistent mode of sensitivity peaks wavelength of photoreceptor 41 (K, C, M, Y) according to the luminous energy peak wavelength of each line head 101 (K, C, M, Y).
Developing apparatus 44 (K, C, M, Y), owing to for example use non magnetic composition toner to be used as developer, so the developer of this a kind of composition is for example carried to developer roll by donor rollers, can be by wing (Block レ-De: blade) limit the thickness of the developer that is attached to the developer roll surface, by making this developer roll contact or compressing (giving as security thick) to photoreceptor 41 (K, C, M, Y), utilize the potential level of photoreceptor 41 (K, C, M, Y) that developer is adhered to, thereby develop as the toner picture.
(ス テ-シ ョ Application: what station) form is black will to be formed platform by the monotone toner picture of 4 such looks, blue or green, pinkish red, each yellow toner picture, by putting on primary transfer roller 45 (K, C, M, Y) primary transfer bias voltage, and be transferred on the intermediate transfer belt 50 in turn once, overlapping successively and become panchromatic toner picture on intermediate transfer belt 50, in secondary transfer roller 66, arrived with recording medium P such as paper by secondary transfer printing, by fixing roller 61 photographic fixing on recording medium P as photographic fixing portion,, discharge on the discharge tray that is formed at device top (ト レ イ) 68 62 by exit roller.
In addition, among Figure 11, the 63rd, with the carton of giving of many pieces the stacked maintenances of recording medium P, the 64th, to carton with one piece of one piece of pick-up roller that ground is given of recording medium P, the 65th, the braking club that the supply of the supply recording medium P of secondary transfer printing portion of subtend secondary transfer roller 66 is stipulated constantly is right, the 66th, secondary transfer roller, its as and intermediate transfer belt 50 between form the secondary transfer printing mechanism of secondary transfer printing portion, the 67th, cleaning doctor, it is as the cleaning mechanism that the toner that residues in the surface of intermediate transfer belt 50 behind the secondary transfer printing is removed.
Like this, the present invention relates to the optical system of line head (light writing line probe) as described above.At first, begin explanation from its principle.
Figure 12 is the figure that is used to illustrate basic principle of the present invention.Figure 12 is illustrated in the line head, the figure of the relation between the photoreceptor (holding body) 41 of the end light-emitting component 2x of row shape luminous element disposed row and the lenticule 5 of this columns of light elements of projection and the projection of this columns of light elements institute as carrying, (a) being situation of the present invention, (b) is the situation of conventional example.In the conventional example of Figure 12 (b), owing to generally limit the empty footpath of lenticule 5 with its profile, so imaging facula 8x imaging on the straight line at the center of passing through end light-emitting component 2x and lenticule 5 as the picture on the photoreceptor 41 of end light-emitting component 2x, so if cause that by the vibration of photoreceptor etc. image planes are that the face of photoreceptor 41 moves forward and backward in lens axis O-O ' direction, and move to the position of 41 of figure ', then become the position 8x ' on this straight line in the position of the imaging facula 8x on the photoreceptor 41, produce the position deviation of imaging facula, relatively move and describe to produce uneven (the spacing inequality of the imaging facula of main scanning direction) in the spacing between the scan line of (retouching く) along sub scanning direction at this imaging facula 8x.
Therefore, in the present invention, shown in Figure 12 (a), in the position of the front side of lenticule 5 focal point F, with aperture (Open mouth) diaphragm 11 and optical axis O-O ' arranged coaxial.If such aperture diaphragm 11 is disposed at the focal point F position, front side of lenticule 5, then pass through the center of aperture diaphragm 11 from the chief ray 12 of end light-emitting component 2x, be refracted at lenticule 5, advance with optical axis O-O ' is parallel, even photoreceptor 41 move to 41 of optical axis O-O ' direction ' the position, the position of imaging facula 8x on the photoreceptor 41 still can become the position 8x ' by the chief ray 12 after lenticule 5 refractions, even the position porpoise of photoreceptor 41 also can not produce the position deviation of imaging facula 8x.Therefore, can not produce spacing inequality, move and describe at sub scanning direction at imaging facula 8x and do not produce inequality in the spacing between the scan line of (retouching く) as the imaging facula 8x of existing main scanning direction.
Promptly, the present invention disposes a plurality of light-emitting components at main scanning direction with the row shape, dispose 1 positive lens system corresponding to this light-emitting component, form in the line head of image projecting on the perspective plane (photoreceptor) by picture (array of imaging facula) with the row of this light-emitting component, by making this projection optical system in the so-called formation that becomes the heart far away (テ レ セ Application ト リ Star Network) as side, make perspective plane (photoreceptor) even the position produce at optical axis direction and depart from the position deviation that also can not produce imaging facula, prevent the deterioration of the image that forms.
And, function as aperture diaphragm 11, owing to be at least the position deviation of the outer imaging facula of axle to be become the shape that limit in the aperture of the direction (main scanning direction) of problem, so, as conventional example (patent documentation 1,3), with respect to 1 positive lens system, under the situation of the array of the light-emitting component of configuration 1 row, can be the shape that only limits the aperture of main scanning direction.In addition, as above-mentioned embodiment of the present invention,, can be the shape in the aperture of restriction main scanning direction even very closely dispose at sub scanning direction under the situation of arrays of 2 row (Fig. 4), can certainly be shape as the aperture of restriction sub scanning direction.Therefore, can be the aperture shape arbitrarily of circular, oval or rectangle.
But, in the explanation of Figure 12, though be to constitute prerequisite by 1 positive lens with lenticule 5, the side that the lens combination of the positive refractive power that is formed by 2 pieces of positive lens of arranged coaxial constitutes, from the viewpoint of free degree of aberration correction etc., more preferred.
In this case, 2 pieces of positive lens that consider to constitute lenticule 5 are thin lens, to from investigating at the visual angle of its light of emitting as the end light-emitting component 2x of the lens combination of the side heart far away.
At first, for the symbol of each parameter, define as Figure 13.Promptly, the angle θ that records from optical axis O-O ' with right week (right all り) for just, more than the image height that records from optical axis O-O ' for just, the distance of the optical axis O-O ' direction that records from thin lens with the right side for just, small character behind the symbol " o " expectation is shown the parameter of object side, the parameter of the small character behind the symbol " i " expression image planes side.
Because by the lens combination (lenticule) the 5th that the 1st positive lens L1 and the 2nd positive lens L2 constitute, the picture side heart far away is so dispose diaphragm 11 according to the mode that makes entrance pupil be positioned at the focal position, front side of lens combination 5.Therefore, establishing the synthetic focal length of lens combination is f Total, establishing light source (luminous body array 1) is S with respect to the position of lens combination object side interarea o, the light emitting device group width of establishing between the end light-emitting component 2x in the illuminator module 4 (overall with) is W o, with reference to Figure 14, then the visual angle ω of end light-emitting component 2x is represented by following formula (1).
ω＝(W o/2)/(—S o—f total) …(1)
Here, the picture of establishing the end light-emitting component 2x of sensitization dignity (image planes) 41 is that the imaging facula group width (overall with) between imaging hot spot 8x is W i, establishing horizontal magnification is β, establishing with respect to lens combination is S as the image planes position of side interarea i, W then oAnd S oUse as shown in the formula (2) and represent.
W o＝—W i/β＝—W i·S o/S i …(2)
Then write as according to the paraxial imagery formula
1/S i＝1/S o+1/f total …(3)
If for S oFind the solution, then become
S o＝S i·f total/(f total—S i) …(4)
If, then write as with formula (1) substitution formula (2), (4) and arrangement
ω＝W i/(2 ftotal) …(5)
Here, be f if establish the focal length of the 1st positive lens L1 1, the focal length of the 2nd positive lens L2 is f 2, the distance of establishing between the 1st positive lens L1 and the 2nd positive lens L2 is d 1, then synthetic focal distance f TotalRepresent as shown in the formula (6).
f total＝f 1·f 2/(f 1+f 2—d 1) …(6)
Formula (5) substitution formula (6) is then become
ω＝W i(f 1+f 2—d 1)/(2f 1·f 2) …(7)
Be conceived to the d of formula (7) 1, then at (f 1+ f 2) ≧ d 1In, make d 1Become as far as possible big one can so that ω diminish.Because the restriction etc. of structure is restricted under the situation than the more close object side of the 1st positive lens L1 the configuration of diaphragm 11, in order to reach the picture side heart far away, lens d1 such as following formula (8) at interval are limited.
0≦d 1≦f 2 (8)
Scope in formula (8), as much as possible little in order to make by the visual angle ω of formula (7) expression, make d 1Getting bigger value as much as possible is exactly with d 1Be made as far as possible near f 2Value.At this moment, the interval of diaphragm 11 and the 1st positive lens L1 approaches 0.If with d 1=f 2Substitution formula (6) and arrangement then become f Total=f 2(Figure 15)
According to more than, to diaphragm 11 being disposed in the research than the thin lens of 2 pieces of positive lens optical systems 5 of more close luminous body array 1 side of the 1st positive lens L1, because the picture side heart far away, for the light quantity that reduces as far as possible around making according to cosine 4 powers (cos4 ?The) rule reduces the shade phenomenon that becomes big, in order to reduce the visual angle of this optical system, be desirably in by 2 pieces of positive lens L1, focal plane, front side (focus face) the configuration diaphragm 11 of the lens combination 5 that L2 constitutes, make the 1st positive lens L1 approach diaphragm 11 and dispose, at this moment, diaphragm 11 and the 1st positive lens L1 as shown in figure 15, near the focal plane, front side of the 2nd positive lens L2.
More than be research, but further study for situation about constituting by the actual thick lens system that constitutes this as thin lens.
In diaphragm 11 is disposed at lens combination 5 than the more close front of the 1st positive lens L1 (object side), even 2 pieces of positive lens L1, L2 are made under the situation of thick lens, in order to make lens combination 5 at the picture side heart far away, the focal position, front side that diaphragm 11 is disposed at the combining optical of 2 pieces of positive lens L1, L2 gets final product.And then, according to above-mentioned result of study,, can reduce the visual angle by making the 1st positive lens L1 and diaphragm 11 near configuration as thin lens, reduce the influence of shade.The embodiment 1 of concrete numerical example described later, establish the face of diaphragm 11 and the 1st positive lens L1 object side face be spaced apart 0.
And then, in thick lens, though the magnifying power by the plane of incidence (object side), exit facet (image planes side) (パ-ワ-: power) distribute, principal plane locations changes, but owing to being that the plane of incidence is protruding protruding straight and even lens by making the 1st positive lens L1, compare with the biconvex positive lens, the 1st positive lens L1 back principle face is shifted to plane of incidence side, so, can enlarge the interval of the 1st positive lens L1 back principle face and the 2nd positive lens L2 front principle face more.In addition, in this case, it is 1 that the lens of the 1st positive lens L1 form face (curved surface), and advantage easy to manufacture is arranged.With respect to embodiment 1, the embodiment 2 of concrete numerical example described later makes the 1st positive lens L1 keep focal length, and is protruding straight and even lens, and maximum visual angle is littler than the situation of embodiment 1.
And then, be under the situation of convex surface at the plane of incidence of the 1st positive lens L1, being absorbed in (Shi い Write む according to the plane of incidence of the 1st positive lens L1) mode in the aperture of diaphragm 11 disposes the 1st positive lens L1.Promptly by the summit of the plane of incidence of the 1st positive lens L1 is disposed according to the mode compared with the more close object side of face of diaphragm 11, can further enlarge the interval (embodiment 3) of the front principle face of the back principle face of the 1st positive lens L1 and the 2nd positive lens L2.In addition, in this case, though the allocation position of diaphragm 11 is focal positions, front side of the combining optical of positive lens L1, L2, but this front side focus slips among the 1st positive lens L1, under the situation of picture side incident directional light, after this optically focused in the 1st positive lens L1 become the diverging light of dispersing from this focal point, the plane of incidence angle of divergence at the 1st positive lens L1 is weakened, and penetrates to object side.Though the picture of seeing from the object side of this focal point (diverging light) is the virtual image, the face that this virtual image exists is the focal plane, front side of lens combination integral body.Therefore, by at this front side focal plane configuration diaphragm 11, become formation at the picture side heart far away.
In addition, even diaphragm 11 is not the plane of incidence position of the 1st positive lens L1, in addition, mode in the aperture that is absorbed in diaphragm 11 according to the plane of incidence and disposing with the 1st positive lens L1, but be disposed near the utmost point of the plane of incidence of the 1st positive lens L1, need only the focal plane, front side that diaphragm 11 is disposed at the lens combination 5 that constitutes by 2 pieces of positive lens L1, L2, just can reduce the visual angle of this optical system, and can reduce shade phenomenon (embodiment 4) based on cosine 4 power rules.
As described above, as lenticule 5, the lens combination of the positive refractive power that is formed by 2 pieces of positive lens of arranged coaxial constitutes, make the front side focus of this combining optical be positioned near the plane of incidence of the 1st positive lens L1 position, by aperture diaphragm 11 being disposed at this focal position, front side, become formation at the picture side heart far away, even producing at optical axis direction, the position of perspective plane (photoreceptor) 41 departs from, also can not produce the position deviation of imaging facula, in addition, that can do one's utmost to reduce lens makes the light quantity of periphery reduce the shade phenomenon that becomes big according to cosine 4 power rules, is difficult to produce at the density unevenness of the imaging facula 8 of luminous body array 1 luminous element disposed row to go shape.
Therefore, if will be used for light writing line probe based on the optical system of above line head of the present invention, then be difficult in the past the spacing of imaging facula 8 of main scanning direction uneven just can not produce, in sub scanning direction moves spacing between the scan line of describing, can not produce inequality at imaging facula 8.
In addition, be difficult for producing based on the density unevenness of 8 of the imaging faculas of the shade of existing lenticule 5, imaging facula 8 moves and density unevenness between the scan line described also is difficult for producing at sub scanning direction.
In addition, more than, though make the focal position, front side of the combining optical of positive lens L1, L2 be positioned at position, in the present invention, the plane of incidence of the 1st positive lens L1 be positioned at the synthetic focal distance f of combining optical near the plane of incidence (nearby) of (closely connecing) the 1st positive lens L1 Total± 10% with interior situation, as near or be positioned near the position.
But, the optical system of line head be above such only in the picture side along under the situation of the formation of the lenticule 5 of the heart far away of main scanning direction configuration 1 row, is imaging hot spot 8x based on specific lenticule 5 to go the picture of end light-emitting component 2x of shape luminous element disposed row in order to make, with interval based on the 8x of the adjacent imaging facula of adjacent lenticule 5, with identical by the spacing of the imaging facula of 1 lenticule 5 imaging row, the light quantity of the imaging facula of other during the imaging facula 8x of the picture of end light-emitting component 2x is listed as compared with imaging facula, because the influence of ケ ラ レ can reduce inevitably.For this is avoided, as Fig. 1～shown in Figure 10, by disposing illuminator module 4 across the interval at main scanning direction, and make illuminator module 4 become the formation of a plurality of arrangements at sub scanning direction, and, to arrangement that should illuminator module 4, microlens array 6 also is the two-dimensional array that disposes lenticule 5 at main scanning direction and sub scanning direction, can solve the problem that the light quantity of imaging facula 8x of the picture of such end light-emitting component 2x reduces.
As described above, the present invention disposes a plurality of light-emitting components at main scanning direction row shape, to should a plurality of light-emitting components, dispose 1 positive lens system, project on the perspective plane (photoreceptor) at picture (array of imaging facula) and to form in the line head of image the row of this light-emitting component, constitute this projection optical system with 2 pieces of positive lens, make it at the picture side heart far away, the plane of incidence of the positive lens of object side is disposed near aperture diaphragm as much as possible, thus, even producing at optical axis direction, the position of perspective plane (photoreceptor) departs from, also can not produce the position deviation of imaging facula, in addition, by reducing the density unevenness between imaging facula, can prevent the deterioration of the image that forms.
And, function as aperture diaphragm 11, owing to get final product so long as at least the position deviation of the outer imaging facula of axle is become the shape that the aperture of the direction (main scanning direction) of problem limits, so, for as conventional example (patent documentation 1,3) at the situation of the array of the light-emitting component of 1 positive lens system configuration 1 row, also can be the shape that only limits the aperture of main scanning direction.In addition, as above-mentioned embodiment of the present invention, even very closely dispose at sub scanning direction under the situation of arrays of 2 row (Fig. 4), also can be the shape in the aperture of restriction main scanning direction, can certainly be shape such as the aperture of also limiting sub scanning direction.Therefore, can be the aperture shape arbitrarily of circular, oval or rectangle.
But, in the explanation of Figure 15, constitute by 1 piece of lens though constitute each positive lens L1, the L2 of lenticule 5, also can constitute by the lens combination of the positive refractive power that forms by the lens of arranged coaxial more than 2 pieces.
In addition, in the above description, lenticule 5 is a prerequisite with the consistent axisymmetric lens combination in focal length, the focal position of main scanning direction and sub scanning direction, but the lens combination that constitutes lenticule 5 also can be made of distortion (ア Na モ Off ィ Star Network) lens combination, uses the focal length system different with multiplying power of main scanning direction and sub scanning direction.In this case, also can constitute: in main scanning direction (main scanning cross section), dispose aperture diaphragm 11, and the face of close object side of combining optical is positioned near this aperture diaphragm 11 (focal position, front side of the main scanning direction of combining optical) according to the mode that becomes as the side heart far away.
In addition, though more than be the optical system of light writing line probe, but for making the light path contrary, and dispose a plurality of photo detectors at main scanning direction row shape, and it is corresponding with these a plurality of photo detectors and dispose a positive lens, and by projecting to reading face and the situation of the line head of reading images with the picture (reading the array of hot spot) of the row of this photo detector is contrary, also can realize constituting this projection optical system with 2 pieces of positive lens, make it at the object side heart far away, the plane of incidence of the positive lens of image planes side is disposed near aperture diaphragm as much as possible, thus, depart from even the position of reading face produces at optical axis direction, also can not produce the position deviation that reads hot spot, in addition, density unevenness between reading is dwindled, and prevent the deterioration of the reading images that forms.In this case, in Figure 12 (a), Figure 15, symbol 41 becomes reading face, and symbol 2x becomes the end photo detector, and its principle is identical with the optical system of light writing line probe.
Then, the light writing line probe to 1 embodiment using such principle of the present invention describes.
Figure 16 is the stereogram after the part of the formation of the light writing line probe of this embodiment of expression is dissectd, and Figure 17 is the sectional view of obtaining along its sub scanning direction.In addition, Figure 18 be represent in this case luminous body array and the vertical view of the configuration of microlens array.And then Figure 19 is the figure of the corresponding relation of 1 lenticule of expression and the illuminator module corresponding with it.
In the present embodiment, identical with the situation of Fig. 4, Fig. 7, to arrange the columns of light elements 3 of 4 light-emitting components 2 that constitute by organic EL in this example at main scanning direction, form two row at sub scanning direction and be used as illuminator module 4, a plurality of these illuminator modules 4 are set and form luminous body array 1 at main scanning direction and sub scanning direction, illuminator module 4 staggers the position foremost of main scanning direction on sub scanning direction, and is arranged in staggered.In the example of Figure 16, dispose 3 row illuminator modules 4 at sub scanning direction.Such luminous body array 1 is formed at the back side (Li face of glass substrate 20), drive by the drive circuit on the back side that is formed at same glass substrate 20.In addition, sealed member 27 sealings of the organic EL at the back side of glass substrate 20 (light-emitting component 2).
Glass substrate 20 embeds to be located in the receiving orifice 22 of rectangular housing 21, lining lid 23 is covered, and fixing by standing finish (gold utensil) 24.The pilot pin 25 that makes the two ends of being located at rectangular housing 21 is embedded the locating hole of the image forming device body of facing mutually, and, the screw patchhole 26 at the two ends by being located at rectangular housing 21, fixed screw is screwed into the screw hole of image forming device body and fixes, thus, light writing line probe 101 is fixed on the position of regulation.
In addition, face side at the glass substrate 20 of housing 21, (ス ペ-サ) 71 by the 1st liner, dispose according to the mode of (permutation) of aligning of the center with each illuminator module 4 of luminous body array 1 and to be provided with aperture 31 (Figure 20, aperture plate 30 Figure 21), thereon across the 2nd liner 72, be configured to the 1st microlens array 61 that this positive lens L1 is an inscape according to the center of each illuminator module 4 of luminous body array 1 and the mode of positive lens L1 alignment (permutation), and then, across the 3rd liner 73, fixing according to the mode of the center of each illuminator module 4 of luminous body array 1 and positive lens L2 alignment is the 2nd microlens array 62 of inscape with this positive lens L2.
Like this, the columns of light elements of each light-emitting device module 4 is carried out the lens arra of the lenticule 5 of projection, constituted by the combination of the 1st lenticule 61 and the 2nd lenticule 62.
In addition, according to the present invention, with with the positive lens L1 that constitutes the 1st microlens array 61 with constitute the consistent mode in object side (front side) focal position of synthetic lens combination of positive lens L2 of the 2nd lenticule 62 and dispose aperture plate 30, and, according to the object side focus mode consistent even approaching of lenticule 5 (positive lens L1+ positive lens L2), set the thickness of the 1st liner the 71, the 2nd liner 72 and the 3rd liner 73 with the face of the object side of positive lens L1.Represent the detailed of aperture plate 30 at Figure 20, Figure 21.Figure 20 is corresponding with the illuminator module 4 of luminous body array 1 and the vertical view of the aperture plate 30 of configuration, and Figure 21 is the figure of expression with respect to the aperture 31 of 1 illuminator module 4 aperture plate 30.Make each center (optical axis) of the lenticule 5 that constitutes by positive lens L1 and positive lens L2 and the center-aligned (permutation) of illuminator module 4 that aperture 31 is set at aperture plate 30, in this embodiment, the shape in each aperture 31 constitutes, the substantially elliptical of the shape that more than sub scanning direction, the aperture of the main scanning direction in each aperture 31 is limited, as above-mentioned, also can be circular, oval, rectangle equal aperture shape.
In above embodiment, use the back side (Li face of being located at glass substrate 20 as light-emitting component 2) organic EL, be the light writing line probe 101 that utilizes so-called end emission (bottom emission) configuration of the light that sends in the face side of this glass substrate 20, but also can use EL element or the LED that has disposed light-emitting component 2 in the face side of substrate.
But, in the above description, luminous body array 1 is as Fig. 7, shown in Figure 180,1 row is set or multiple row is arranged the columns of light elements 3 that a plurality of light-emitting components 2 form at main scanning direction at sub scanning direction, thereby form illuminator module 4, corresponding with each illuminator module 4 and dispose lenticule 5.But, light-emitting component 2 is become long row shape with fine arranged spaced on main scanning direction, control according to the mode that only makes the light-emitting component mass-sending light corresponding wherein with illuminator module 4, by according to the illumination mode between the light-emitting component group is controlled, can the formation illuminator module 4 identical with the situation of Fig. 7, Figure 18.Figure 22 represents the figure corresponding with Figure 18 of this situation.Promptly as luminous body array 1, make light-emitting component 2 at main scanning direction, as with fine uniformly-spaced and the columns of light elements 3 of continuous long line shape, and arrange, only the group of passing through lenticule 5 light-emitting component 2 relevant with the formation of imaging facula 8 ' (representing with zero) is wherein carried out light emitting control, do not make be present in this light-emitting component 2 ' group between light-emitting component 2 " group of (using ● expression) is not luminous, can constitute the each several part of illuminator module 4 thus.Under the situation of Figure 22, dispose 3 row lenticules 5 at main scanning direction, and with each row of lenticule 5 accordingly sub scanning direction with 2 row form the columns of light elements 3 of 2 row ', make the columns of light elements 3 of this 2 row ' in light-emitting component 2 become staggered configuration, and with only make each columns of light elements 3 ' in 4 light-emitting components 2 ' luminous, these 4 light-emitting components 2 ' 8 light-emitting components 2 " non-luminous mode is controlled.
In addition, in the above description, under situation about all light-emitting components 2,2 in all illuminator modules 4 ' adjustment being lighted constantly for 1 the straight line that is depicted in the main scanning direction extension, carry to hold at picture and arrange (And ぶ on the body 41) imaging facula 8, with 4 of illuminator modules suitably (
Figure A200810211074D0023154947QIETU
Not enough な く) adjacent and mode side by side constitutes.But, also can according to the light-emitting component 2,2 that constitutes illuminator module 4 ', carry the mode of holding overlapping imaging hot spot 8 on the body 41 at picture, have redundancy ground set the light-emitting component 2,2 that constitutes illuminator module 4 ' quantity and position.Thus, though for example near the light-emitting component the end of illuminator module 42,2 ' picture be to produce density unevenness in the imaging hot spot 8, also can be by making its overlapped correction.
Figure 23 is the figure that illustrates as the following example of an one example, be under the situation of formation of Figure 22 promptly at luminous body array 1, make the light-emitting component 2 ' increase by 1 (light-emitting component 2a) that constitutes each illuminator module 4 become 4 * 2, carry the row hold on the body 41 imaging facula 8 side by side by adjacent lenticule 5 at picture, the overlapping and example of exposure with 1 imaging facula 8 mutually in the end.But though Figure 23 illustrates in luminous body array 1 side, light-emitting component 2a is overlapping (light-emitting component between dotted line) in the end of the opposition side of adjacent illuminator module 4, and when the imaging multiplying power of lenticule 5 was-1 times, this figure was correct.
But, employed microlens array 61,62 can use any formation of known technology in the smooth writing line probe 101 of the present invention, at Figure 24, represented to make up the sectional view of obtaining along main scanning direction that the 1st microlens array 61 and the 2nd microlens array 62 constitute the situation (Figure 16, Figure 17) of the array of lenticule 5 according to the mode that makes lenticule L1, L2 co-axially align.In this embodiment, arrange, constitute each lenticule L1, L2 with lens that are made of transparent resin facial 35 are integrally formed in the one side (object side) of the glass substrate 34 of each microlens array 61,62.In this case, because to make the face as side of the 2nd microlens array 62 is the plane, even for example improved when the microlens array as the line head of image processing system uses toner because of the developer spatter property that the plane that is attached to microlens array also can clean simply that disperses.
Then, the concrete numerical example of the employed optical system of above-mentioned embodiment is represented as embodiment 1～4.
Figure 25 (a), (b) be with 1 lenticule 5 corresponding optical system of embodiment 1 respectively at main scanning direction, the sectional view of sub scanning direction, be the example of following lenticule 5: promptly the exiting side at light-emitting component 2 does not dispose glass substrate, lenticule 5 is as the synthetic lens combination that is made of biconvex positive lens L1 and biconvex positive lens L2, aperture plate 30 is disposed at object side (front side) focus of the synthetic lens combination that constitutes by biconvex positive lens L1 and biconvex positive lens L2, becoming the heart far away as side, and the face top of the lens face (convex surface) of the object side of the biconvex positive lens L1 of this object side is consistent with this object side focus.
The numeric data that makes this embodiment is as shown in following: from illuminator module 4 side direction photoreceptors (image planes) 41 sides successively: r 1, r 2Be the radius of curvature (mm) of each optical surface, d 1, d 2Be the interval between each optical surface (mm), n D1, n D2Be the refractive index of the d line of each transparent medium, υ D1, υ D2Abbe number for each transparent medium.In addition, r 1, r 2Also represent optical surface, optical surface r 1Be illuminator module (object plane) 4, optical surface r 2Be the aperture 31 of aperture plate 30, r 3, r 4For the face of the object side of biconvex positive lens L1, as the face of side, optical surface r 5, r 6For the face of the object side of biconvex positive lens L, as the face of side, optical surface r 7It is photoreceptor (image planes) 41.In addition, the face of the object side of biconvex positive lens L1 is an aspheric surface, about aspherical shape, establishing distance from optical axis when being r, uses
Figure A200810211074D00241
Represent.Wherein, c is the curvature (1/r) on the optical axis, and K is circular cone (コ-ニ Star Network) coefficient, and A is 4 times a aspheric surface.In following numeric data, K 3, A 3Being each circular cone coefficient of the face of the object side of biconvex positive lens L1, is 4 times asphericity coefficient.
Figure 26 (a), (b) be with 1 lenticule 5 corresponding optical system of embodiment 2 respectively at main scanning direction, the sectional view of sub scanning direction, be the example of following such lenticule 5: promptly the exiting side at light-emitting component 2 does not dispose glass substrate, lenticule 5 is the synthetic lens combinations that are made of protruding straight and even lens L1 and biconvex positive lens L2, aperture plate 30 is disposed at object side (front side) focus of the synthetic lens combination that is made of protruding positive lens L1 and the straight and even lens L2 of biconvex and is becoming the heart far away as side, and the face top of the lens face of the object side of this protruding straight and even lens L1 (convex surface) is consistent with this object side focus.
This embodiment is with respect to embodiment 1, and making the 1st positive lens L1 under the situation that keeps focal length is protruding straight and even lens, and maximum visual angle is littler than embodiment 1.In addition, adjust from illuminator module 4 to aperture plate the distance till 30, thereby improve the image formation state of image planes.
Like this, be protruding straight and even lens by making the 1st positive lens L1, can make as the 1st microlens array 61 and the lens formation face that forms becomes only single face (unilateral), have the easy advantage that becomes in the manufacturing.
The numeric data that makes this embodiment is as shown in following, from illuminator module 4 sides to photoreceptor (image planes) 41 sides successively: r 1, r 2Be the radius of curvature (mm) of each optical surface, d 1, d 2Be the interval between each optical surface (mm), n D1, n D2Be the refractive index of the d line of each transparent medium, υ D1, υ D2Abbe number for each transparent medium.In addition, r 1, r 2Also represent optical surface, optical surface r 1Be illuminator module (object plane) 4, optical surface r 2Be the aperture 31 of aperture plate 30, r 3, r 4For the face of the object side of protruding straight and even lens L1, as the face of side, optical surface r 5, r 6For the face of the object side of the straight and even lens L of biconvex, as the face of side, optical surface r 7It is photoreceptor (image planes) 41.In addition, the face of the object side of protruding straight and even lens L1 is an aspheric surface, and aspherical shape is used establishing distance from optical axis when being r
Figure A200810211074D00251
Represent.Wherein, c is the curvature (1/r) on the optical axis, and K is the circular cone coefficient, and A is 4 times a aspheric surface.In following numeric data, K 3, A 3Being the circular cone coefficient separately of the face of the object side of protruding straight and even lens L1, is 4 times asphericity coefficient.
Figure 27 (a), (b) be with 1 lenticule 5 corresponding optical system of embodiment 3 respectively at main scanning direction, the sectional view of sub scanning direction, be the example of following such lenticule 5: promptly the exiting side at light-emitting component 2 does not dispose glass substrate, lenticule 5 is as the synthetic lens combination that is made of protruding straight and even lens L1 and biconvex positive lens L2, aperture plate 30 is disposed at object side (front side) focus of the synthetic lens combination that constitutes by protruding straight and even lens L1 and biconvex positive lens L2, becoming the heart far away as side, and the convex surface of the object side of this protruding straight and even lens L1 is absorbed in the aperture 31 of aperture plate 30.
That is, the summit of the plane of incidence (convex surface) by making protruding straight and even lens L1 disposes according to the mode than the more close object side of face of aperture plate 30, can further enlarge the interval of the front principle face of the back principle face of protruding straight and even lens L1 and biconvex positive lens L2.In addition, in this case, the focal position, front side of the synthetic lens combination that though the allocation position of aperture plate 30 is protruding straight and even lens L1 and biconvex positive lens L2 to be constituted, but this front side focus slips among the protruding straight and even lens L1, under the situation of picture side incident directional light, optically focused in protruding straight and even lens L1 becomes the diverging light of dispersing from this focal point afterwards, the plane of incidence (convex surface) at protruding straight and even lens L1 weakens the angle of divergence, penetrates to object side.Though the picture of seeing from the object side of this focal point (diverging light) is the virtual image, the face that this virtual image exists is the focal plane, front side of lens combination integral body.Therefore, by at this front side focal plane configuration aperture plate 30, and become formation at the picture side heart far away.
The numeric data that makes this embodiment has to photoreceptor (image planes) 41 sides from illuminator module 4 sides: r successively as shown in following 1, r 2Be the radius of curvature (mm) of each optical surface, d 1, d 2Be the interval (mm) of each optical surface, n D1, n D2Be the refractive index of the d line of each transparent medium, υ D1, υ D2Abbe number for each transparent medium.In addition, r 1, r 2Also represent optical surface, optical surface r 1Be illuminator module (object plane) 4, optical surface r 2Be the aperture 31 of aperture plate 30, r 3, r 4For the face of the object side of protruding straight and even lens L1, as the face of side, optical surface r 5, r 6For the face of the object side of biconvex positive lens L, as the face of side, optical surface r 7Make photoreceptor (image planes) 41.In addition, the face of the object side of protruding straight and even lens L1 is an aspheric surface, and aspherical shape is being established the distance of leaving optical axis when being r, uses
Represent.But c is the curvature (1/r) on the optical axis, and K is the circular cone coefficient, and A is 4 times a aspheric surface.In following numeric data, K 3, A 3Being each circular cone coefficient of the face of the object side of protruding straight and even lens L1, is 4 times asphericity coefficient.
In addition, for embodiment 3, even at the inner aperture diaphragm that forms of lens L1 comparatively under the situation of difficult, also can be on the face around the convex surface of the plane of incidence of the 1st positive lens L1 integrally formed diaphragm 30.Promptly as shown in figure 28, at lens arra (Figure 16 by the lenticule that constitutes 5 of the 1st microlens array 61 and the 2nd microlens array 62, Figure 17, Figure 24), by for example optionally applying the light-proofness film along the edge (full front of a Chinese gown) portion (paddy portion) between the convex surface of the plane of incidence of the 1st positive lens L1 of the object side of the 1st microlens array 61, can be at the 1st microlens array 61 integrally formed diaphragms 30, in addition, this embodiment can separate the distance between the front principle face of the back principle face of the 1st positive lens L1 and the 2nd positive lens L2 as far as possible, we can say that this is even more ideal on the one hand further dwindling the visual angle.
Figure 29 (a), (b) be 1 lenticule 5 corresponding with embodiment 4 optical system respectively at main scanning direction, the sectional view of sub scanning direction, be the example of following such lenticule 5: promptly the exiting side at light-emitting component 2 does not dispose glass substrate, lenticule 5 is the synthetic lens combinations that are made of protruding straight and even lens L1 and protruding straight and even lens L2, aperture plate 30 is disposed at object side (front side) focus of the synthetic lens combination that constitutes by protruding straight and even lens L1 and protruding straight and even lens L2, becoming the heart far away as side, and the convex surface of the object side of this protruding straight and even lens L1 is positioned at the position of leaving object side from aperture plate 30 a little.
As this embodiment (embodiment 3 is also identical), in the present invention, object side focus about the synthetic lens combination that constitutes by the 1st positive lens L1 and the 2nd positive lens L2, not only the face of the face of the object side of the 1st positive lens L1 top is consistent with this object side focus, even be positioned near the position it, all can realize doing one's utmost reducing making the light quantity of periphery reduce the shade phenomenon that becomes big, be difficult for producing at the density unevenness of the imaging facula 8 of luminous body array 1 row shape luminous element disposed row according to cosine 4 power rules.
In addition, as this embodiment, the face as side by making the 2nd positive lens L2 is the plane, can make that the face of picture side of the 2nd microlens array 62 of the lens arra that constitutes lenticule 5 is whole to be to have improved following such spatter property in the plane: even promptly for example as the microlens array use of the line head of image processing system the time, also can clean simply because of the toner of the developer plane that is attached to microlens array of dispersing.
The numeric data that makes this embodiment has to photoreceptor (image planes) 41 sides from illuminator module 4 sides: r successively as shown in following 1, r 2Be the radius of curvature (mm) of each optical surface, d 1, d 2Be the interval between each optical surface (mm), n D1, n D2Be the refractive index of the d line of each transparent medium, υ D1, υ D2Abbe number for each transparent medium.In addition, r 1, r 2Also represent optical surface, optical surface r 1Be illuminator module (object plane) 4, optical surface r 2Be the aperture 31 of aperture plate 30, r 3, r 4For the face of the object side of protruding straight and even lens L1, as the face of side, optical surface r 5, r 6For the face of the object side of biconvex positive lens L, as the face of side, optical surface r 7It is photoreceptor (image planes) 41.In addition, the face of the object side of protruding straight and even lens L1 is an aspheric surface, and aspherical shape is used establishing distance from optical axis when being r
Figure A200810211074D00271
Represent.But c is the curvature (1/r) on the optical axis, and K is the circular cone coefficient, and A is 4 times a aspheric surface.In following numeric data, K 3, A 3Being each circular cone coefficient of the face of the object side of protruding straight and even lens L1, is 4 times asphericity coefficient.
Embodiment 1
r 1=∞ (object plane) d 1=6.6460 r 2=∞ (diaphragm) d 2=0.0000
r 3=3.4613 (aspheric surface) d 3=1.0000 n D1=1.5168 υ D1=64.2
K 3＝0.0
A 3＝—0.0195
r 4＝—3.4613 d 4＝2.4564 r 5＝3.3896 d 5＝1.0000
n D2=1.5168 υ D2=64.2 r 6=-3.3896 d 6=1.5000 r 7=∞ (image planes)
Use wavelength 632.5nm
The 1st focal length of lens 3.5333mm
The 2nd focal length of lens 3.4639mm
Imaging facula group width (overall with) 0.4mm
The 1st lens back principle face～the 2nd lens front principle face is apart from 3.1512mm
3.608 ° at maximum visual angle
Embodiment 2
r 1=∞ (object plane) d 1=6.9201 r 2=∞ (diaphragm) d 2=0.0000
r 3=1.8200 (aspheric surface) d 3=1.0000 n D1=1.5168 υ D1=64.2
K 3＝0.0
A 3＝—0.03493
r 4＝∞ d 4＝2.4564 r 5＝3.3896 d 5＝1.0000
n D2=1.5168 υ D2=64.2 r 6=-3.3896 d 6=1.5000 r 7=∞ (image planes)
Use wavelength 632.5nm
The 1st focal length of lens 3.5333mm
The 2nd focal length of lens 3.4639mm
Imaging facula group width (overall with) 0.4mm
The 1st lens back principle face～the 2nd lens front principle face is apart from 3.4639mm
3.308 ° at maximum visual angle
Embodiment 3
r 1=∞ (object plane) d 1=7.0578 r 2=∞ (diaphragm) d 2=-0.1300
r 3=1.8200 (aspheric surface) d 3=1.0000 n D1=1.5168 υ D1=64.2
K 3＝0.0
A 3＝—0.0420
r 4＝∞ d 4＝2.5499 r 5＝3.3896 d 5＝1.0000
n D2=1.5168 υ D2=64.2 r 6=-3.3896 d 6=1.5000 r 7=∞ (image planes)
Use wavelength 632.5nm
The 1st focal length of lens 3.5333mm
The 2nd focal length of lens 3.4639mm
Imaging facula group width (overall with) 0.4mm
The 1st lens back principle face～the 2nd lens front principle face is apart from 3.5740mm
3.201 ° at maximum visual angle
Embodiment 4
r 1=∞ (object plane) d 1=5.1280 r 2=∞ (diaphragm) d 2=0.1817
r 3=1.3472 (aspheric surface) d 3=1.0000 n D1=1.5168 υ D1=64.2
K 3＝0.0000
A 3＝—0.04946
r 4=∞ d 4=1.9000 r 5=1.4225 (aspheric surface) d 5=0.8500
n d2＝1.5168 υ d2＝64.2
K 3＝0.0000
A 3＝—0.1123
r 6=∞ d 6=0.7500 r 7=∞ (image planes)
Use wavelength 632.5nm
The 1st focal length of lens 2.6154mm
The 2nd focal length of lens 2.7616mm
Imaging facula group width (overall with) 0.4mm
The 1st lens back principle face～the 2nd lens front principle face is apart from 2.5600mm
4.46 ° at maximum visual angle
But, as above optical system based on smooth writing line probe of the present invention in, enter for the light 5 incidents of specific lenticule, that come self-luminous body module 4 that prevents to incide microlens array in the light path of adjacent lenticule 5 and produce solar flare (Off レ ア), be desirably in the flare aperture plate of 1 piece of configuration between luminous body array 1 and the aperture plate 30 or many pieces.The sectional view of obtaining along main scanning direction of representing an example of this situation at Figure 30.In this case, with 6 pieces of solar flare aperture plates (Off レ ア
Figure A200810211074D0030155625QIETU
The り plate) 32 across interval and aperture plate 30 configured in parallel, and each flare aperture plate 32 is provided with the 31 corresponding apertures 33, aperture with aperture plate 30.The aperture diaphragm of indication of the present invention refers to the aperture 31 of aperture plate 30, the aperture 33 of the such flare aperture plate 32 that is not meant.
More than, to based on line head of the present invention and the image processing system that uses it, be illustrated according to its principle and embodiment, but the present invention is not limited to these embodiment, various distortion can be arranged.

Claims (14)

1. line head, wherein,
Possess:
The positive lens system, it has the lens of two positive refracting powers;
Lens arra, it disposes a plurality of described positive lens system in the 1st direction;
Luminous body array, its object side at described lens arra has a plurality of light-emitting components with respect to 1 described positive lens system configuration; And
Aperture plate, it forms the aperture diaphragm of position of the object side focus of described positive lens system,
The face of the object side of the lens of the object side of described positive lens system is positioned at the position of approaching described object side focus.
2. line head according to claim 1 is characterized in that,
The face of the object side of the lens of the object side of described positive lens system, with respect to described object side focus, be positioned at described positive lens system synthetic focal length ± 10% scope.
3. line head according to claim 1 and 2 is characterized in that,
Described lens are made of lens group.
4. line head according to claim 3 is characterized in that,
In described two lens, the face as side of the lens of object side is made of the plane.
5. according to any described line head in the claim 1 to 4, it is characterized in that,
The face of the object side of the lens of the object side of described at least positive lens system is made of convex surface, and the part that comprises the face top of this convex surface is absorbed in the aperture of described aperture plate and disposes.
6. line head according to claim 5 is characterized in that,
On the face of the object side of described lens arra, form the light-proofness parts and constitute described aperture plate.
7. according to any described line head in the claim 1 to 6, it is characterized in that,
The face as side as the lens of side of described at least positive lens system is made of the plane.
8. according to any described line head in the claim 1 to 7, it is characterized in that,
The shape of described aperture diaphragm is the shape that at least aperture of described the 1st direction is limited.
9. according to any described line head in the claim 1 to 8, it is characterized in that,
Described a plurality of light-emitting component forms the described columns of light elements of arranging a plurality ofly on the 2nd direction vertical with the 1st direction.
10. according to any described line head in the claim 1 to 9, it is characterized in that,
The mode across illuminator group at interval disposes described a plurality of light-emitting component on the 1st direction to be formed on.
11. according to any described line head in the claim 1 to 10, it is characterized in that,
Described light-emitting component is made of organic EL.
12. according to any described line head in the claim 1 to 10, it is characterized in that,
Described light-emitting component is made of LED.
13. image processing system, carry the image that is provided with at least more than 2 of holding body on every side at picture and form platform, form the unit that platform configuration has these each images formation usefulness of line head, developing mechanism and transfer means of any record in charged mechanism, the claim 1 to 12 at described image, offset medium carries out image with series system thus and forms by each platform.
14. a line head, wherein,
Possess:
The positive lens system, it has two lens of positive refractive power;
Lens arra, it disposes a plurality of described positive lens system in the 1st direction;
The photoreceptor array, it has a plurality of photo detectors as side with respect to 1 described positive lens system configuration described lens arra; And
Aperture plate, it forms the aperture diaphragm of position of the picture side focus of described positive lens system;
The face as side as the lens of side of described positive lens system is positioned at the position of approaching described picture side focus.
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