CN102401979B - Image reading lens, image reading device using the same and image forming device - Google Patents
Image reading lens, image reading device using the same and image forming device Download PDFInfo
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- CN102401979B CN102401979B CN201110269163.6A CN201110269163A CN102401979B CN 102401979 B CN102401979 B CN 102401979B CN 201110269163 A CN201110269163 A CN 201110269163A CN 102401979 B CN102401979 B CN 102401979B
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Abstract
To provide an image reading lens for reducing and imaging image information in a document on an imaging element formed by arraying elements linearly, and reading the image information by the imaging element. In this image reading lens, a first group 1 is a meniscus lens having a convex face facing the object side; a second group 2 is a biconvex lens, a third group 3 is a cemented lens constituted of a plurality of lenses, wherein the face closest to the object side has a convex face on the object side, and the face closest to the image side has a convex face on the image side; and a fourth group 4 is a meniscus lens having a concave face facing the object side. When the focal length of the whole system of the image reading lens is f, the thickness of the whole system of the image reading lens is [Sigma]d, the thickness of the cemented lens of the third group is d<SB>3g</SB>, the following conditions: (5) 0.6f<d<[Sigma]d<0.9f, and (6) 0.4<d3g/[Sigma]d<0.6 are satisfied.
Description
Technical field
The present invention relates to image reading lens, image read-out and imaging device, be specifically related to for the image reading lens in the imaging device such as digital copier or facsimile recorder, this image reading lens reads reduced being imaged onto with the image information of the original image on the imaging apparatus of linear array, and forms image according to the image information read.
Background technology
In the imaging device such as digital copier or facsimile recorder, image reading unit or image analyzer image reading lens reduce the image needing to read, and carry out imaging and signal transacting for imaging apparatuss such as CCD.
In order to read colored original, such as utilize so-called three line CCD, namely arranging on one piece of substrate respectively with three row imaging apparatuss of red, green, blue filtrator, image is imaged onto on each imaging apparatus face, being then converted to signal being decomposed into trichromatic colored original.
In the image planes and imaging apparatus of above-mentioned image reading lens, not only require, in high spatial frequency region, there is high-contrast, and need the aperture efficiency of image peripheral to reach close to 100%.
And then, in order to read colored original well, needing the assorted image space at optical axis direction of red, green, blue consistent, must carry out colors good Chromatically compensated for this reason.
Moreover, in order to realize image read-out miniaturization, reduce image read-out cost, require that composing images reads the eyeglass miniaturization of camera lens and reduces number of lenses.
To this, the image reading lens of prior art, in order to obtain high quality graphic, adopts Gaussian to read camera lens.
Gaussian reads camera lens can obtain good curvature of the image compensation, even if bore also can suppress comet hot spot (comatic flare) comparatively greatly within half angle of view scope 20 °.But, Gauss reads camera lens and substantially adopts convex, recessed, concave, convex four groups of structures, is generally the distressed structure utilizing this basic structure, for this reason, diameter of lens becomes large, is an impediment to image reading lens and uses the miniaturization of image read-out and the reduction of cost of this image reading lens.
For the problems referred to above, prior art adopts the four group of four chip architecture telephong type camera lens not only having reduced eyeglass number but also can maintain high image quality, and this camera lens is configured to arrange convex surface from object one side towards the positive falcate first arrangement of mirrors sheet of object, bi-concave second arrangement of mirrors sheet, biconvex the 3rd arrangement of mirrors sheet and concave surface towards negative meniscus the 4th arrangement of mirrors sheet of object.
Patent documentation 1 (TOHKEMY 2008-275783 publication) etc. discloses telephong type image reading lens, and the f-number of four lens structures is wherein F6, is difficult to the optical properties such as the visual angle obtaining sufficient brightness and broadness.
In addition, patent documentation 2 (TOHKEMY 2005-234068 publication), patent documentation 3 (TOHKEMY 2005-266771 publication) etc. also disclose the camera lens of reading with great visual angle formed with five eyeglasses, but the lightness of these camera lenses is also F6, as broad as long with the reading camera lens of four lens structures in lightness.
Summary of the invention
In view of above-mentioned problem, the present invention is for the purpose of the image reading lens providing a kind of 3rd arrangement of mirrors sheet and formed by multi-disc eyeglass, although this camera lens has with great visual angle, f-number is about 5, brighter, can obtain good optical property.
Technical scheme of the present invention is specific as follows.
(1) first, the invention provides a kind of image reading lens, wherein set gradually from object one side: the first arrangement of mirrors sheet with positive refractive power, the second arrangement of mirrors sheet with negative refractive power, aperture, there is the 3rd arrangement of mirrors sheet of positive refractive power and there is the 4th arrangement of mirrors sheet of negative refractive power, it is characterized in that, described first arrangement of mirrors sheet is the meniscus shaped lens of convex surface towards object one side; Described second arrangement of mirrors sheet is biconcave lens; Described 3rd arrangement of mirrors sheet is the cemented doublet formed with many pieces of eyeglasses, and the face closest to object one side is the convex surface towards object one side; Described 4th arrangement of mirrors sheet is the meniscus shaped lens of concave surface towards object one side, the whole focal length f of described image reading lens, the integral thickness of described image reading lens and total length ∑ d and, the cemented doublet thickness d of described 3rd arrangement of mirrors sheet
3gbetween satisfy the following conditional expression (5) and (6),
(5)0.6f＜∑d＜0.9f
(6)0.4＜d
3g/∑d＜0.6。
Above-mentioned conditional (6) defines the scope of the 3rd group of lens thickness and the ratio of image reading lens total length.If this ratio is less than the lower limit of this scope, then need between the 3rd arrangement of mirrors sheet and the 4th arrangement of mirrors sheet, to arrange interval to compensate meridianal image surface, be difficult to the diameter shortening camera lens total length and reduce lens for this reason.Otherwise, if this ratio is greater than the upper limit of above-mentioned scope, is then difficult to the aberration compensation ability of the lens set beyond guarantee the 3rd arrangement of mirrors sheet, sufficient aberration compensation cannot be kept.
Above-mentioned conditional (5) defines image reading lens total length.If this total length is less than the lower limit of specialized range, then need the refracting power strengthening each eyeglass, be difficult to carry out good image planes for this reason and compensate.Otherwise if exceed higher limit, then the effective diameter of camera lens total length and camera lens all becomes large, is difficult to the miniaturization realizing image reading lens.
Therefore, meeting conditional of the present invention (5) and (6) is the necessary condition realizing image reading lens miniaturization, obtain high image quality.
In addition, between the second arrangement of mirrors sheet and the 3rd arrangement of mirrors sheet, arrange aperture is conducive to compensating well crooked.(2) the present invention also provides based on the image reading lens described in above-mentioned (1), it is characterized in that, described 3rd arrangement of mirrors sheet and the described 4th spacing d of arrangement of mirrors sheet on optical axis
3g-4gbetween satisfy the following conditional expression (7),
(7)0.08＜d
3g-4g/∑d＜0.2。
Above-mentioned conditional (7) defines the scope of the spacing size between the 3rd arrangement of mirrors sheet and the 4th arrangement of mirrors sheet.If the lower limit of the scope that this spacing less-than condition formula specifies, then light beam can be needed with larger incident angles the 4th lens because spacing is narrow between the 3rd lens and the 4th lens, marginal ray is difficult to obtain good compensation for this reason.And image reading lens total length can be increased, be unfavorable for the miniaturization of camera lens.
Otherwise if be greater than the higher limit of specialized range, then owing to being the direction that height that axle outer light beam enters the 4th arrangement of mirrors sheet increases, therefore the lens diameter of the 4th arrangement of mirrors sheet increases, and is difficult to the miniaturization realizing image reading lens.And image reading lens total length reduces, and not easily carries out aberration compensation.
(3) the present invention also provides based on the image reading lens described in above-mentioned (1), it is characterized in that, with the front arrangement of mirrors sheet that described first arrangement of mirrors sheet and described second arrangement of mirrors sheet are formed, there is negative refractive power, with the rear arrangement of mirrors sheet that described 3rd arrangement of mirrors sheet and described 4th arrangement of mirrors sheet are formed, there is positive refractive power, the achromatism condition sum ∑ 1/f v of described front arrangement of mirrors sheet
fg, described rear arrangement of mirrors sheet achromatism condition sum ∑ 1/f v
bg, and the summation ∑ 1/f v of achromatism condition of described image reading lens entirety
allbetween satisfy the following conditional expression (8) and (9)
(8) 0.8＜|∑1/fv
fg/∑1/fv
all|＜2
(9) 0＜|∑1/fv
bg/∑1/fv
all|＜1。
Conditional (8) and (9) define the scope of the ratio shared by aberration of front arrangement of mirrors sheet in the achromatism condition of image reading lens entirety and the ratio shared by aberration of rear arrangement of mirrors sheet.
If conditional (8) is close to lower limit, then Chromatically compensated in order to carry out in whole camera lens, the achromatism condition of rear arrangement of mirrors sheet also will be tending towards reducing, that is conditional (9) will be infinitely close to 0, for this reason, if conditional (8) is less than lower limit, then arrangement of mirrors sheet in rear cannot carry out Chromatically compensated.And if greater than condition formula (8) higher limit, then will there is larger aberration in front arrangement of mirrors sheet, thus when making to carry out Chromatically compensated in the arrangement of mirrors sheet of rear occur difficulty.The formula that satisfies condition (8) and (9), can lightness be about in the image reading lens of F5 carry out Chromatically compensated fully.
(4) the present invention also provides based on the image reading lens described in above-mentioned (3), it is characterized in that, the achromatism condition sum ∑ 1/fv of described front arrangement of mirrors sheet
fgwith the achromatism condition sum ∑ 1/fv of described rear arrangement of mirrors sheet
bgbetween to meet lower condition (10),
(10) -0.5＜∑1/fv
bg/∑1/fv
fg＜0
Conditional (10) reads the achromatism conditional relationship between front arrangement of mirrors head in camera lens and rear arrangement of mirrors head for specified image together with conditional (8) and (9).
Identical with conditional (8) and (9), if within the scope that the ratio of rear arrangement of mirrors sheet and the achromatism condition of front arrangement of mirrors sheet specifies in above-mentioned conditional (6), between the image space of often kind of color of the eyeglass then in image reading lens, deviation is less, can obtain good Chromatically compensated.
(5) the present invention also provides based on the image reading lens described in above-mentioned (1), it is characterized in that, the rearmost radius-of-curvature r of described 3rd arrangement of mirrors sheet
3glwith the radius-of-curvature r of the foremost of described 4th arrangement of mirrors sheet
4gfbetween meet the following conditions (11),
(11) 2＜1/r
3gl-1/r
4gf＜5
Conditional (11) defines the relation between the radius-of-curvature of the rearmost radius-of-curvature of the 3rd arrangement of mirrors sheet and the foremost of described 4th arrangement of mirrors sheet.If the lower limit that less-than condition formula (11) specifies, then comet aberration compensation is not enough, and if be greater than higher limit, then comet aberration compensation can be caused superfluous.And then, if exceed the scope of conditional (11), even if the formula of satisfying condition (5) and (6), be also difficult to obtain high image quality at periphery.
(6) the present invention also provides based on the image reading lens described in above-mentioned (1), it is characterized in that, described 3rd arrangement of mirrors head is the balsaming lens formed towards the negative lens of object one side with biconvex lens and concave surface.
3rd arrangement of mirrors has the large biconvex head mirror of positive refractive power, not only can reduce the total length of image reading lens, and can coordinate formation the 3rd arrangement of mirrors sheet with the lens with large negative refractive power, makes image reading lens have good aberration compensation effect.
(7) the present invention also provides based on the image reading lens described in above-mentioned (6), it is characterized in that, the d line refractive index nd of the first lens
1, the 5th lens d line refractive index nd
5, the first lens Abbe number vd
1, the negative lens of the 3rd arrangement of mirrors sheet and the Abbe number of the 5th lens mean value vd
45between meet the following conditions (12) and (13),
(12) -0.2＜nd
1-nd
5＜-0.08
(13) 8＜vd
1-vd
45＜32
Conditional (12) defines the scope of the first lens and the refringence of last eyeglass that is between the 5th lens.If this refringence is less than the lower limit that above-mentioned conditional (8) specifies, then the bending increase of image planes peripheral part, is difficult to make near optical axis and peripheral part image space is in the direction of the optical axis consistent.On the contrary, if be greater than above-mentioned conditional (8) set upper limit value, then comet aberration becomes serious, and periphery is difficult to obtain good imaging performance.
Conditional (13) define the positive lens i.e. Abbe number of the first lens in the arrangement of mirrors sheet of front, with the negative lens i.e. mean value vd of the Abbe number of the 4th lens and the 5th lens in the arrangement of mirrors sheet of rear
45between difference scope.If this Abbe number differ from the lower limit being less than above-mentioned conditional (13) and specifying, then the comet aberration of short wavelength one side will occur significantly to depart from compared to the comet aberration of other wavelength, thus makes short wavelength one side cannot obtain good imaging performance.Otherwise if be greater than higher limit, then generation significantly departs from by the same coma aberration long wavelength one side, cannot obtain good imaging performance.
(8) the present invention also provides based on the image reading lens described in above-mentioned (6), it is characterized in that, the eyeglass effective diameter of biconvex lens forming described 3rd arrangement of mirrors sheet is less than 1.2 with the ratio of lens thickness.
It is over half that the thickness of the 3rd arrangement of mirrors sheet needs for camera lens total length, but for the ease of processing, can also glue together the many pieces of eyeglasses of more than three pieces, obtain biconvex lens i.e. the 3rd arrangement of mirrors sheet with positive refractive power.
(9) the present invention also provides based on the image reading lens described in above-mentioned (1), and it is characterized in that, the eyeglass in this image reading lens is glass lens, and not containing comprising arsenic, plumbous objectionable impurities in this eyeglass.
All not containing the objectionable impurities comprising lead, arsenic in the glass material of all eyeglasses, like this, the material of image reading lens can recycling, and processing-waste can not occur causes water pollution, is conducive to environmental protection.
(10) the present invention also provides based on the image reading lens described in above-mentioned (1), it is characterized in that, has at least the profile of one piece of eyeglass to be non-circular.
In eyeglass in image reading lens, especially the 4th arrangement of mirrors sheet, in order to obtain high image quality, its lens diameter is larger.But, with according to any direction arrangement photoelectric conversion part as the line wiping sensor formed using CCD as imaging apparatus time, for image reading lens, only need to guarantee that the orientation that namely a direction is parallel to photo-electric conversion element has sufficient width, so that light beam passes through.And on the direction arranged perpendicular to photo-electric conversion element, lens height can be less than lens diameter.For this reason, can reduce, perpendicular to the size on the direction of line wiping sensor orientation, to realize image reading lens miniaturization.
(11) secondly, the invention provides a kind of image read-out, it reads original copy information with illuminator and image reading lens, this illuminator is placed on original copy arranges original copy on surface for irradiating, this image reading lens is for being subject to the original copy information imaging of this illuminator irradiation to linear imaging apparatus, it is characterized in that, described image reading lens is the image reading lens in claim 1 ~ 10 described in any one.
Image reading lens of the present invention is used in image read-out, can implement device miniaturization while maintenance high quality graphic.
(12) the present invention also provides based on the image read-out described in above-mentioned (11), it is characterized in that, at least there is one piece of catoptron, this catoptron is composing images reading unit together with described illuminator, described image reading lens and described imaging apparatus, this image fetching unit along Manuscript scanner, to read described original copy information.
By being integrally formed image fetching unit, not only can make image read-out miniaturization further, and can one mobile image reading unit, hydraulic performance decline when avoiding image fetching unit to move.
(13) moreover, the invention provides a kind of imaging device, its original copy information read according to image read-out, image carrier surface is exposed, form image, it is characterized in that, described image read-out is the image read-out described in above-mentioned (11) or (12).
Image read-out of the present invention is used for imaging device, can implement device miniaturization while maintenance high quality graphic.
Effect of the present invention is as follows.
Invention according to above-mentioned (1), can implement device miniaturization while maintenance high quality graphic.
Invention according to above-mentioned (2), wide angle picture reads the miniaturization that also can realize image reading lens in camera lens when not increasing lens external diameter.
Invention according to above-mentioned (3), wide angle picture reads the miniaturization that also can realize image reading lens in camera lens when not increasing lens total length.
Invention according to above-mentioned (4), can obtain high-contrast near optical axis, meanwhile, makes near optical axis and periphery image space is in the direction of the optical axis consistent, and then, can carry out good Chromatically compensated, obtain high image quality.
Invention according to above-mentioned (1), can implement device miniaturization while maintenance high quality graphic.
Invention according to above-mentioned (2), wide angle picture reads the miniaturization that also can realize image reading lens in camera lens when not increasing lens external diameter.
Invention according to above-mentioned (3), can realize the little and image reading lens that lightness is large of aberration.
Invention according to above-mentioned (4), can realize the good image reading lens that effectively image space deviation that is Chromatically compensated and often kind of color is less further.
Invention according to above-mentioned (5), can realize compensating comet aberration and from the image reading lens all to periphery near optical axis with good imaging performance.
Invention according to above-mentioned (6), can realize small-sized and bright image reading lens.
Invention according to above-mentioned (7), can realize the image reading lens look comet aberration of periphery being carried out to good compensation.
Invention according to above-mentioned (8), can realize being convenient to process the image reading lens that cutter has good imaging performance.
Invention according to above-mentioned (9), camera lens material can recycling, and processing-waste polluted water can not occur, and can contribute to environmental protection.
Invention according to above-mentioned (10), can reduce, perpendicular to the size of the image reading lens on the direction of line wiping sensor orientation, to realize image reading lens miniaturization.
Invention according to above-mentioned (11), is used for image read-out by image reading lens of the present invention, can realize the miniaturization of image read-out.
Invention according to above-mentioned (12), image reading unit in image read-out described in (11) is configured to unit, number of elements can be reduced, be embodied as picture equipment miniaturization, all parts assembly error in image reading unit can also be suppressed simultaneously, obtain good image reading quality.
Invention according to above-mentioned (13), can obtain under any environment for use, to keep having good picture quality when duplicating, realize the miniaturization of imaging device simultaneously.
Accompanying drawing explanation
Fig. 1 is the optical design figure showing image reading lens embodiment of the present invention.
Fig. 2 is the aberration diagram of image reading lens embodiment 1 of the present invention.
Fig. 3 is the aberration diagram of image reading lens embodiment 2 of the present invention.
Fig. 4 is the aberration diagram of image reading lens embodiment 3 of the present invention.
Fig. 5 is the aberration diagram of image reading lens embodiment 4 of the present invention.
Fig. 6 is the optical design figure that display image reading lens of the present invention implements 5.
Fig. 7 is the aberration diagram of the image reading lens of Fig. 6.
Fig. 8 is the optical design figure that display image reading lens of the present invention implements 6.
Fig. 9 is the aberration diagram of the image reading lens of Fig. 8.
Figure 10 is the optical design figure that display image reading lens of the present invention implements 7.
Figure 11 is the aberration diagram of the image reading lens of Figure 10.
Figure 12 is the optical design figure that display image reading lens of the present invention implements 8.
Figure 13 is the aberration diagram of the image reading lens of Figure 12.
Figure 14 is the optical design figure that display image reading lens of the present invention implements 9.
Figure 15 is the aberration diagram of the image reading lens of Figure 14.
Figure 16 is the optical design figure that display image reading lens of the present invention implements 10.
Figure 17 is the aberration diagram of the image reading lens of Figure 16.
Figure 18 is the optical design figure that display image reading lens of the present invention implements 11.
Figure 19 is the aberration diagram of the image reading lens of Figure 18.
Figure 20 is the optical design figure that display image reading lens of the present invention implements 12.
Figure 21 is the aberration diagram of the image reading lens of Figure 20.
Figure 22 is the optical design figure that display image reading lens of the present invention implements 13.
Figure 23 is the aberration diagram of the image reading lens of Figure 22.
Figure 24 is the exploded view of display using non-circular lens as the image reading lens of the 4th arrangement of mirrors sheet.
Figure 25 A and Figure 25 B is respectively front elevation and the side view of the lens barrel adopting non-circular lens.
Figure 26 is the cut-open view of image read-out embodiment.
Figure 27 is the cut-open view of another embodiment of image read-out.
Figure 28 is the cut-open view of imaging device embodiment.
Description of symbols
1 first arrangement of mirrors sheet, 2 second arrangement of mirrors sheets, 3 the 3rd arrangement of mirrors sheets, 4 the 4th arrangement of mirrors sheets
Embodiment
Below illustrate and relate to image reading lens of the present invention and use the image read-out of this image reading lens and the embodiment of imaging device.
As shown in Figure 1, image reading lens of the present invention is the telephong type lens system arranging optical element from object one side towards image planes one side in the following order.
First arrangement of mirrors sheet 1 is that convex surface has a positive meniscus shaped lens of positive refractive power towards object one side; Second arrangement of mirrors sheet 2 has bi-concave negative lens; 3rd arrangement of mirrors sheet 3 has convexo-convex positive lens and concave surface towards object one side and the meniscus shaped lens with negative refractive power glues together the lens formed; 4th arrangement of mirrors sheet 4 is that concave surface has negative meniscus lens of negative refractive power towards object one side; Between the second arrangement of mirrors sheet 2 and the 3rd arrangement of mirrors sheet 3, there is aperture.
Below exemplify concrete numerical value of the present invention.The meaning that symbol in each embodiment represents is as follows.
F: the synthesis focal length of whole system
FNo: f-number
M: minification
ω: half angle of view (degree)
Y: object height
R: lens material radius-of-curvature
D: interplanar distance
Nd: the refractive index of lens material
V d: the Abbe number of lens material
The refractive index temperature variation factor of dn/dt:d line
∑ dn/dt (convex): the refractive index temperature variation factor with the d line of the lens of positive refractive power
∑ dn/dt (recessed): the refractive index temperature variation factor with the d line of the lens of negative refractive power
The numeral of above-mentioned each mark afterbody arranges order, for distinguishing each numerical value from object one side.In the form of each embodiment, " j " represents said sequence.
[embodiment 1]
f：22.7、FNo＝5.3、m＝0.124、Y＝108
[table 1]
| j | r | d | n d | v d | Effective diameter | Title material (manufacturer) |
| C1 | ∞ | 3.20 | 1.51633 | 64.1 | S-BSL7(OHARA) | |
| C2 | ∞ | |||||
| 1 | 7.791 | 1.62 | 1.61800 | 63.4 | 4.8 | S-PHM52(OHARA) |
| 2 | 24.000 | 0.68 | 3.9 | |||
| 3 | -33.582 | 1.07 | 1.69895 | 30.1 | 3.8 | STIM35(OHARA) |
| 4 | 10.338 | 0.30 | 4.4 | |||
| 5 | 0.000 | 0.20 | 7.8 | |||
| 6 | 12.117 | 8.40 | 1.88300 | 40.8 | 8.4 | S-LAH58(OHARA) |
| 7 | -9.811 | 1.32 | 1.48749 | 70.2 | 8.6 | S-FSL5(OHARA) |
| 8 | -59.999 | 1.99 | 10.7 | |||
| 9 | -5.847 | 1.42 | 1.76182 | 26.5 | 4.8 | S-TIH14(OHARA) |
| 10 | -11.558 | 3.9 | ||||
| C3 | ∞ | 0.70 | 1.51633 | 64.1 | S-BSL7(OHARA) | |
| C4 | ∞ |
Fig. 2 is the aberration diagram of embodiment 1.
[embodiment 2]
f：22.7、FNo＝5、m＝0.124
[table 2]
| j | r | d | n d | v d | Effective diameter | Title material (manufacturer) |
| C1 | ∞ | 3.20 | 1.51633 | 64.1 | S-BSL7(OHARA) | |
| C2 | ∞ | |||||
| 1 | 7.401 | 1.60 | 1.61800 | 63.4 | 5 | S-PHM52(OHARA) |
| 2 | 20.992 | 0.52 | 4.2 | |||
| 3 | -38.635 | 0.80 | 1.68893 | 31.1 | 4 | S-TIM28(OHARA) |
| 4 | 9.378 | 0.40 | 4.5 | |||
| 5 | 0.000 | 0.10 | 8.1 | |||
| 6 | 11.503 | 9.34 | 1.88300 | 40.8 | 8.6 | S-LAH58(OHARA) |
| 7 | -10.056 | 0.80 | 1.51633 | 64.1 | 8.7 | S-BSL7(OHARA) |
| 8 | -55.158 | 2.14 | 10.8 | |||
| 9 | -5.857 | 1.30 | 1.76182 | 26.5 | 5 | S-TIH14(OHARA) |
| -11.432 | 4.2 | |||||
| C3 | ∞ | 0.70 | 1.51633 | 64.1 | S-BSL7(OHARA) | |
| C4 | ∞ |
Fig. 3 is the aberration diagram of embodiment 2.
[embodiment 3]
f：22.4、FNo＝5.5、m＝0.124、Y＝108
[table 3]
| j | r | d | n d | v d | Effective diameter | Title material (X manufacturer) |
| C1 | ∞ | 3.20 | 1.51633 | 64.1 | S-BSL7(OHARA) | |
| C2 | ∞ | |||||
| 1 | 7.778 | 1.60 | 1.61800 | 63.4 | 4.9 | S-PHM52(OHARA) |
| 2 | 23.107 | 0.57 | 3.8 | |||
| -33.162 | 1.25 | 1.69895 | 30.1 | 3.6 | S-TIM35(OHARA) | |
| 4 | 10.561 | 0.40 | 4.0 | |||
| 5 | 0.000 | 0.10 | 7.4 | |||
| 6 | 11.848 | 8.32 | 1.88300 | 40.8 | 8.1 | S-LAH58(OHARA) |
| 7 | -9.975 | 1.43 | 1.48749 | 70.2 | 8.3 | S-FSL5(OHARA) |
| 8 | -41.499 | 1.90 | 10.4 | |||
| 9 | -5.805 | 1.43 | 1.76182 | 26.5 | 4.9 | S-TIH14(OHARA) |
| 10 | -12.569 | |||||
| C3 | ∞ | 0.70 | 1.51633 | 64.1 | S-BSL7(OHARA) | |
| C4 | ∞ |
Fig. 4 is the aberration diagram of embodiment 3.
[embodiment 4]
f：22.8、FNo＝5.5、m＝0.124、Y＝108
[table 4]
| j | r | d | nd | vd | Effective diameter | Title material (manufacturer) |
| C1 | ∞ | 3.20 | 1.51633 | 64.1 | S-BSL7(OHARA) | |
| C2 | ∞ | |||||
| 1 | 6.730 | 1.53 | 1.61800 | 63.4 | 4.8 | S-PHM52(OHARA) |
| 2 | 17.743 | 0.29 | 3.7 | |||
| 3 | -49.658 | 1.15 | 1.64769 | 33.8 | 3.6 | S-TIM22(OHARA) |
| 4 | 7.771 | 0.27 | 4.1 | |||
| 5 | 0.000 | 0.05 | 7.2 | |||
| 6 | 9.367 | 7.99 | 1.79952 | 42.2 | 7.8 | S-LAH52(OHARA) |
| 7 | -7.721 | 0.80 | 1.56384 | 60.7 | 7.9 | S-BAL41(OHARA) |
| 8 | -41.776 | 1.85 | 10.7 | |||
| 9 | -5.235 | 2.08 | 1.80518 | 25.4 | 4.8 | S-TIH6(OHARA) |
| 10 | -10.011 | 3.7 | ||||
| C3 | ∞ | 0.70 | 1.51633 | 64.1 | S-BSL7(OHARA) | |
| C4 | ∞ |
Fig. 5 is the aberration diagram of embodiment 4.
The conditional (1) of above-described embodiment 1 to 4 is as follows to the result of calculation of (4).
(value of the conditional of embodiment 1 to 4)
[table 5]
| Conditional (1) | Conditional (2) | Conditional (3) | Conditional (4) | |
| Embodiment 1 | 0.57 | 0.75f | 0.12 | 3.5 |
| Embodiment 2 | 0.60 | 0.75f | 0.13 | 3.5 |
| Embodiment 3 | 0.57 | 0.76f | 0.11 | 3.3 |
| Embodiment 4 | 0.55 | 0.70f | 0.12 | 3.8 |
The eyeglass effective diameter of the biconvex lens of the 3rd arrangement of mirrors sheet is as follows with the ratio of lens thickness.
[table 6]
| Effective diameter/the lens thickness of biconvex lens | |
| Embodiment 1 | 8.6/8.4＝1.02 |
| Embodiment 2 | 8.7/9.34＝0.93 |
| Embodiment 3 | 8.3/8.32＝1.00 |
| Embodiment .4 | 7.9/7.99＝0.99 |
[embodiment 5]
f：22.7、FNo＝5.2、m＝0.124、Y＝108
[table 7]
| j | r | d | nd | vd | Effective diameter | Title material (manufacturer) |
| C1 | ∞ | 3.20 | 1.51633 | 64.1 | S-BSL7(OHARA) | |
| C2 | ∞ | |||||
| 1 | 7.791 | 1.62 | 1.61800 | 63.4 | 6.6 | S-PHM52(OHARA) |
| 2 | 24.000 | 0.68 | 5.5 | |||
| 3 | -33.582 | 1.07 | 1.69895 | 30.1 | 4.8 | S-TIM35(OHARA) |
| 4 | 10.338 | 0.30 | 3.9 | |||
| 5 | Aperture | 0.20 | 3.78 | |||
| 6 | 12.117 | 8.40 | 1.88300 | 40.8 | 4.4 | S-LAH58(OHARA) |
| 7 | -9.811 | 1.32 | 1.48749 | 70.2 | 7.7 | S-FSL5(OHARA) |
| 8 | -59.999 | 1.99 | 8.4 | |||
| 9 | -5.847 | 1.42 | 1.76182 | 26.5 | 8.6 | S-TIH14(OHARA) |
| 10 | -11.558 | 10.7 | ||||
| C3 | ∞ | 0.70 | 1.51633 | 64.1 | S-BSL7(OHARA) | |
| C4 | ∞ |
Fig. 6 is the index path of embodiment 5.The structure of the embodiment 1 shown in its basic structure with Fig. 1 is identical.Fig. 7 is the aberration diagram of embodiment 5.
[embodiment 6]
f：22.7、FNo＝5.3、m＝0.124、Y＝108
[table 8]
| j | r | d | nd | vd | Effective diameter | Title material (manufacturer) |
| C1 | ∞ | 3.20 | 1.51633 | 64.1 | S-BSL7(OHARA) | |
| C2 | ∞ | |||||
| 1 | 7.252 | 1.71 | 1.60300 | 65.44 | 6.7 | S-PHM53(OHARA) |
| 2 | 25.209 | 0.66 | 5.6 | |||
| 3 | -39.765 | 1.01 | 1.68893 | 31.07 | 4.9 | S-TIM28(OHARA) |
| 4 | 8.689 | 0.40 | 3.9 | |||
| 5 | Aperture | 0.1 | 3.70 | |||
| 6 | 10.561 | 8.24 | 1.83400 | 37.16 | 4.2 | S-LAH60(OHARA) |
| 7 | -7.359 | 0.80 | 1.57501 | 41.50 | 7.5 | S-TIL27(OHARA) |
| 8 | -29.474 | 1.73 | 8.0 | |||
| 9 | -5.720 | 2.35 | 1.76182 | 26.52 | 8.2 | S-TIH14(OHARA) |
| 10 | -13.484 | 11.1 | ||||
| C3 | ∞ | 0.70 | 1.51633 | 64.1 | S-BSL7(OHARA) | |
| C4 | ∞ |
Fig. 8 is the index path of embodiment 6, and shown in its basic structure with Fig. 1, structure is identical.Fig. 9 is the aberration diagram of embodiment 6.
[embodiment 7]
f：22.8、FNo＝5.5、m＝0.124、Y＝108
[table 9]
| j | r | d | nd | vd | Effective diameter | Title material (manufacturer) |
| C1 | ∞ | 3.20 | 1.51633 | 64.1 | S-BSL7(OHARA) | |
| C2 | ∞ | |||||
| 1 | 7.522 | 1.67 | 1.61800 | 63.33 | 6.6 | S-PHM52(OHARA) |
| 2 | 22.637 | 0.77 | 5.5 | |||
| 3 | -33.69 | 0.95 | 1.69895 | 30.13 | 4.7 | S-TIM35(OHARA) |
| 4 | 9.325 | 0.40 | 3.8 | |||
| 5 | Aperture | 0.10 | 3.60 | |||
| 6 | 12.237 | 7.51 | 1.88300 | 40.76 | 4.0 | S-LAH58(OHARA) |
| 7 | -9.892 | 0.80 | 1.51633 | 64.14 | 7.3 | S-BSL7(OHARA) |
| 8 | -141.129 | 3.05 | 7.9 | |||
| 9 | -5.686 | 1.05 | 1.80809 | 22.76 | 8.6 | S-NPH1(OHARA) |
| 10 | -8.546 | 10.7 | ||||
| C3 | ∞ | 0.70 | 1.51633 | 64.1 | S-BSL7(OHARA) | |
| C4 | ∞ |
Figure 10 is the index path of embodiment 7, and shown in its basic structure with Fig. 1, structure is identical.Figure 11 is the aberration diagram of embodiment 7.
[embodiment 8]
f：22.6、FNo＝5.3、m＝0.124、Y＝108
[table 10]
| j | r | d | nd | vd | Effective diameter | Title material (manufacturer) |
| C1 | ∞ | 3.20 | 1.51633 | 64.1 | S-BSL7(OHARA) | |
| C2 | ∞ | |||||
| 1 | 7.039 | 1.79 | 1.57135 | 52.95 | 6.5 | S-BAL3(OHARA) |
| 2 | 21.259 | 0.41 | 5.3 | |||
| 3 | -36.072 | 1.28 | 1.69895 | 30.13 | 5.0 | S-TIM35(OHARA) |
| 4 | 8.993 | 0.40 | 3.9 | |||
| 5 | Aperture | 0.10 | 3.74 | |||
| 6 | 10.643 | 8.93 | 1.88300 | 40.76 | 4.2 | S-LAH58(OHARA) |
| 7 | -6.992 | 0.80 | 1.67270 | 32.10 | 7.6 | S-TIM25(OHARA) |
| 8 | -21.378 | 1.43 | 8.2 | |||
| 9 | -5.909 | 1.17 | 1.72000 | 46.02 | 8.2 | S-LAM61(OHARA) |
| 10 | -16.777 | 10.1 | ||||
| C3 | ∞ | 0.70 | 1.51633 | 64.1 | S-BSL7(OHARA) | |
| C4 | ∞ |
Figure 12 is the index path of embodiment 8, and shown in its basic structure with Fig. 1, structure is identical.Figure 13 is the aberration diagram of embodiment 8.
[embodiment 9]
f：22.8、FNo＝4.9、m＝0.124、Y＝108
[table 11]
| j | r | d | nd | vd | Effective diameter | Title material (manufacturer) |
| C1 | ∞ | 3.20 | 1.51633 | 64.1 | S-BSL7(OHARA) | |
| C2 | ∞ | |||||
| 1 | 8.060 | 1.64 | 1.69350 | 50.81 | 7.1 | S-LAL58(OHARA) |
| 2 | 23.760 | 0.62 | 6.1 | |||
| 3 | -40.719 | 1.58 | 1.75520 | 27.51 | 5.5 | S-TIH4(OHARA) |
| 4 | 10.737 | 0.40 | 4.2 | |||
| 5 | Aperture | 0.10 | 4.00 | |||
| 6 | 13.691 | 7.00 | 1.88300 | 40.76 | 4.4 | S-LAH58(OHARA) |
| 7 | -8.929 | 1.68 | 1.51742 | 52.43 | 7.3 | S-NSL36(OHARA) |
| 8 | -446.513 | 2.18 | 8.3 | |||
| 9 | -5.532 | 1.11 | 1.78470 | 26.29 | 8.4 | S-TIH23(OHARA) |
| 10 | -8.584 | 10.2 | ||||
| C3 | ∞ | 0.70 | 1.51633 | 64.1 | S-BSL7(OHARA) | |
| C4 | ∞ |
Figure 14 is the index path of embodiment 9, and shown in its basic structure with Fig. 1, structure is identical.Figure 15 is the aberration diagram of embodiment 9.
[embodiment 10]
f：22.9、FNo＝5.4、m＝0.124、Y＝108
[table 12]
| j | r | d | nd | vd | Effective diameter | Title material (manufacturer) |
| C1 | ∞ | 3.20 | 1.51633 | 64.1 | S-BSL7(OHARA) | |
| C2 | ∞ | |||||
| 1 | 6.920 | 1.73 | 1.62299 | 58.16 | 6.7 | S-BSM15(OHARA) |
| 2 | 17.662 | 0.39 | 5.5 | |||
| 3 | -44.486 | 1.88 | 1.71736 | 29.52 | 5.4 | S-TIH1(OHARA) |
| 4 | 10.829 | 0.40 | 3.8 | |||
| 5 | Aperture | 0.10 | 3.58 | |||
| 6 | 13.909 | 6.08 | 1.88300 | 40.76 | 3.9 | S-LAH58(OHARA) |
| 7 | -8.788 | 0.80 | 1.56732 | 42.82 | 6.6 | S-TIL26(OHARA) |
| 8 | 675.839 | 2.10 | 7.2 | |||
| 9 | -4.849 | 0.82 | 1.71736 | 29.52 | 7.4 | S-TIH1(OHARA) |
| 10 | -6.940 | 8.7 | ||||
| C3 | ∞ | 0.70 | 1.51633 | 64.1 | S-BSL7(OHARA) | |
| C4 | ∞ |
Figure 16 is the index path of embodiment 10, and shown in its basic structure with Fig. 1, structure is identical.Figure 17 is the aberration diagram of embodiment 10.
[embodiment 11]
f：22.6、FNo＝4.8、m＝0.124、Y＝108
[table 13]
| j | r | d | nd | vd | Effective diameter | Title material (manufacturer) |
| C1 | ∞ | 3.20 | 1.51633 | 64.1 | S-BSL7(OHARA) | |
| C2 | ∞ | |||||
| 1 | 7.525 | 2.20 | 1.61800 | 63.33 | 6.9 | S-PHM52(OHARA) |
| 2 | 22.844 | 0.41 | 5.4 | |||
| 3 | -48.885 | 0.80 | 1.66680 | 33.05 | 5.1 | S-TIM39(OHARA) |
| 4 | 8.994 | 0.40 | 4.2 | |||
| 5 | Aperture | 0.10 | 4.04 | |||
| 6 | 10.585 | 9.04 | 1.88300 | 40.76 | 4.6 | S-LAH58(OHARA) |
| 7 | -16.706 | 1.02 | 1.54072 | 47.23 | 8.0 | S-TIL2(OHARA) |
| 8 | -21.378 | 1.64 | 8.5 | |||
| 9 | -5.864 | 4.25 | 1.75520 | 27.51 | 8.6 | S-TIH4(OHARA) |
| 10 | -15.658 | 13.4 | ||||
| C3 | ∞ | 0.70 | 1.51633 | 64.1 | S-BSL7(OHARA) | |
| C4 | ∞ |
Figure 18 is the index path of embodiment 11, and shown in its basic structure with Fig. 1, structure is identical.Figure 19 is the aberration diagram of embodiment 11.
[embodiment 12]
f：22.9、FNo＝5.5、m＝0.124、Y＝108
[table 14]
| j | r | d | nd | vd | Effective diameter | Title material (manufacturer) |
| C1 | ∞ | 3.20 | 1.51633 | 64.1 | S-BSL7(OHARA) | |
| C2 | ∞ | |||||
| 1 | 7.298 | 1.72 | 1.62299 | 58.16 | 6.7 | S-BSM15(OHARA) |
| 2 | 20.923 | 0.47 | 5.6 | |||
| 3 | -32.882 | 1.86 | 1.71736 | 29.52 | 5.3 | S-TIH1(OHARA) |
| 4 | 11.128 | 0.40 | 3.8 | |||
| 5 | Aperture | 0.10 | 3.58 | |||
| 6 | 14.324 | 5.20 | 1.88300 | 40.76 | 3.9 | S-LAH58(OHARA) |
| 7 | -8.291 | 0.80 | 1.56732 | 42.82 | 6.2 | S-TIL26(OHARA) |
| 8 | -603.102 | 2.79 | 6.8 | |||
| 9 | -4.915 | 0.96 | 1.71736 | 29.52 | 7.5 | S-TIH1(OHARA) |
| 10 | -7.041 | 9.0 | ||||
| C3 | ∞ | 0.70 | 1.51633 | 64.1 | S-BSL7(OHARA) | |
| C4 | ∞ |
Figure 20 is the index path of embodiment 12, and shown in its basic structure with Fig. 1, structure is identical.Figure 21 is the aberration diagram of embodiment 12.
[embodiment 13]
f：22.8、FNo＝5.0、m＝0.124、Y＝108
[table 15]
| j | r | d | nd | vd | Effective diameter | Title material (manufacturer) |
| C1 | ∞ | 3.20 | 1.51633 | 64.1 | S-BSL7(OHARA) | |
| C2 | ∞ | |||||
| 1 | 8.371 | 1.64 | 1.73400 | 51.47 | 7.3 | S-LAL59(OHARA) |
| 2 | 24.605 | 1.03 | 6.3 | |||
| 3 | -77.838 | 0.88 | 1.80000 | 29.84 | 4.9 | S-NBH55(OHARA) |
| 4 | 10.032 | 0.40 | 4.0 | |||
| 5 | Aperture | 0.10 | 3.84 | |||
| 6 | 11.471 | 9.28 | 1.88300 | 40.76 | 4.3 | S-LAH58(OHARA) |
| 7 | -10.003 | 0.80 | 1.56873 | 63.16 | 8.1 | S-BAL22(OHARA) |
| 8 | -72.025 | 2.22 | 8.7 | |||
| 9 | -5.716 | 2.96 | 1.92286 | 18.90 | 8.8 | S-NPH2(OHARA) |
| 10 | -10.084 | 12.5 | ||||
| C3 | ∞ | 0.70 | 1.51633 | 64.1 | S-BSL7(OHARA) | |
| C4 | ∞ |
Figure 22 is the index path of embodiment 13, and shown in its basic structure with Fig. 1, structure is identical.Figure 23 is the aberration diagram of embodiment 13.
The conditional (5) of above-described embodiment 5 to 13 is as follows to the result of calculation of (13).
(value of the conditional of embodiment 5 to 13)
[table 16]
| (5) | (6) | (7) | (8) | (9) | (10) | (11) | (12) | (13) | |
| Embodiment 5 | 0.749 | 0.572 | 0.117 | 1.336 | 0.336 | -0.251 | 3.505 | -0.144 | 14.956 |
| Embodiment 6 | 0.755 | 0.531 | 0.102 | 1.155 | 0.155 | -0.134 | 3.177 | -0.152 | 30.934 |
| Embodiment 7 | 0.715 | 0.510 | 0.187 | 1.559 | 0.559 | -0.359 | 3.852 | -0.190 | 19.882 |
| Embodiment 8 | 0.720 | 0.597 | 0.088 | 1.162 | 0.162 | -0.139 | 2.771 | -0.149 | 13.890 |
| Embodiment 9 | 0.716 | 0.532 | 0.134 | 1.534 | 0.534 | -0.348 | 4.068 | -0.091 | 11.450 |
| Embodiment 10 | 0.625 | 0.481 | 0.147 | 1.658 | 0.658 | -0.397 | 4.754 | -0.094 | 21.998 |
| Embodiment 11 | 0.878 | 0.507 | 0.083 | 1.210 | 0.210 | -0.173 | 2.799 | -0.137 | 25.964 |
| Embodiment 12 | 0.623 | 0.420 | 0.195 | 1.828 | 0.828 | -0.453 | 4.633 | -0.094 | 21.998 |
| Embodiment 13 | 0.846 | 0.523 | 0.115 | 0.980 | 0.020 | 0.020 | 3.672 | -0.189 | 10.469 |
The eyeglass effective diameter of the biconvex lens of the 3rd arrangement of mirrors sheet is as follows with the ratio of lens thickness.
[table 17]
| Ratio | |
| Embodiment 5 | 1.091 |
| Embodiment 6 | 1.099 |
| Embodiment 7 | 1.029 |
| Embodiment 8 | 1.175 |
| Embodiment 9 | 0.959 |
| Embodiment 10 | 0.921 |
| Embodiment 11 | 1.130 |
| Embodiment 12 | 0.839 |
| Embodiment 13 | 1.146 |
Figure 24 shows an example and adopts non-circular eyeglass as the image reading lens of its feature using the 4th arrangement of mirrors sheet.This image reading lens sets gradually from object one side: the first arrangement of mirrors sheet 1, for convex surface is towards the positive meniscus shaped lens of object one side; Second arrangement of mirrors sheet 2 is double-concave negative lens; 3rd arrangement of mirrors sheet 3, the balsaming lens that positive lens and negative meniscus lens bonding for biconvex are formed; And the 4th arrangement of mirrors sheet 4, concave surface is towards the negative meniscus lens of object one side.Not shown aperture is provided with between second arrangement of mirrors sheet 2 and the 3rd arrangement of mirrors sheet 3.On the direction of the photo-electric conversion element orientation perpendicular to CCD line wiping sensor, as long as the size of the 4th arrangement of mirrors sheet 4 can convey the light beam of other eyeglass equal extent by just can, for this reason, as shown in the figure, 4th arrangement of mirrors sheet 4 is formed the non-circular eyeglass removing top and the bottom, achieves the miniaturization of image reading lens.
Figure 25 A and Figure 25 B shows the embodiment of the lens barrel of above-mentioned non-circular lens respectively with front elevation and side view.Transverse direction (orientation of the photo-electric conversion element) length of lens barrel 21 is greater than longitudinal length, is rectangle.There is in the present embodiment jut 21a ~ 21i, for the location between lens barrel and each lens set (1 ~ 4 of Figure 24), in this jut, be pressed into each lens set, for precision fixing len well.In illustrated example, the 4th arrangement of mirrors sheet 4 is set as non-circular unit structure, for this reason, is provided with three juts for the first lens set 1 to the three lens set 3 location, and is provided with 6 juts of locating for the 4th lens set 4.At least need the jut arranging more than three, correctly can draw lens position.
Figure 26 shows the first embodiment of image read-out of the present invention.Mark 31 in this figure and represent original copy mounting glass, mark 33 represents the first running body, and mark 34 represents the second running body, and mark 35 represents image reading lens, and mark 36 represents imaging apparatus.
Be placed on needing the original copy 32 read on the upper surface of original copy mounting glass 33.First running body 33 with perpendicular to figure surface direction for long side direction, and catoptron 33c is remained tilt 45 degree relative to the original copy mounting surface of original copy mounting glass 31, with certain speed V along the direction perpendicular to above-mentioned long side direction, move to position, mark 33 ' shown position from position shown in the mark 33 Figure 26.
First running body 33 also keeps lighting device, and this lighting device comprises length perpendicular to the long fluorescent light 33a and the catoptron 33b that scheme surface.Fluorescent light 33a is luminous when the first running body 33 moves to the right of Figure 26, irradiates the original copy 32 on original copy mounting glass 31.For this reason, in during the first running body 33 moves to the movement of the shown position of mark 33 ', original copy 32 is subject to irradiating scanning.
About the fluorescent light 33a of the first running body 33, the spots such as Halogen lamp LED, xenon lamp, cold-cathode tube can be utilized or utilize the linear light source being formed a line by the pointolites such as LED and form or the linear light source utilizing light conductor pointolite being converted to line source and then the face illuminating source that can also be representative in order to organic EL etc.
Second running body 34 is with the direction perpendicular to plan for long side direction, and wherein keep a pair minute surface mutually perpendicular catoptron 34a, 34b, this second running body 34 is synchronous with the first running body 33, moves to the shown position of mark 34 ' with certain speed V/2.
When original copy 32 is subject to scanning illumination, by the light of the illuminated portion reflection of original copy 32 after the catoptron 33c of the first running body 33 is reflected, and then catoptron 34a, 34b of being subject to the second running body 34 reflect successively, become imaging beam, incide image reading lens 35.Now, the velocity ratio of the first running body 33 and the second running body 34 is 2: 1, and thus, the illuminated portion of original copy is kept certain to the optical path length of image reading lens 35.
The imaging beam of incident image reading camera lens 35 is subject to the imaging effect of image reading lens 35, forms the reduced image of original copy 32 at the sensitive surface of imaging apparatus 36.Imaging apparatus 36 is ccd linear sensor, wherein closely arranges small photoelectric conversion part along the direction perpendicular to figure surface.Along with original copy 32 is subject to scanning illumination, original image is converted to electric signal with pixel unit and exports by this imaging apparatus 36.
Image look is decomposed into red, green, blue three kinds of colors and reads look information by imaging apparatus 36, and synthesizes the electric signal of each photoelectric conversion part conversion, to read coloured image.
Image reading lens 35 shown in Figure 26 adopts image reading lens of the present invention, is expected to the miniaturization realizing image reading lens.
Figure 27 shows the second embodiment of image read-out of the present invention.Mark 41 represents original copy mounting glass, and mark 43 represents image fetching unit, and mark 44 represents image reading lens, and mark 45 represents imaging apparatus.
The upper surface of original copy mounting glass 41 lays the original copy 42 needing to read.Image fetching unit 43 with perpendicular to figure surface direction for long side direction, wherein keep catoptron 43e, 43f, 43g of being obliquely installed relative to the original copy mounting surface of original copy mounting glass 41, in Figure 27, this original reading unit 43 moves to the shown position of mark 43 ' with certain speed V from position shown in mark 43.
Keep in image fetching unit 43 perpendicular to scheming long fluorescent light 43a, 43c and catoptron 43b, 43d that surperficial direction is length direction.When image fetching unit 43 moves to the right of Figure 27, fluorescent light 43a and 43c is luminous, irradiates the original copy 42 on original copy mounting glass 41.For this reason, original copy 42 is during image fetching unit 43 moves to the 43 ' shown position from position shown in mark 43, and original copy 42 is subject to scanning illumination.
When original copy 42 is subject to scanning illumination, the reflected light in the illuminated portion of original copy 42 reads camera lens 44 as imaging beam incident image after being subject to catoptron 43e, 43f, 43g reflection successively.Now because all catoptrons are subject to the one maintenance of image fetching unit, therefore, the optical path length from the illuminated portion of original copy to image reading lens 44 keeps certain.
The imaging beam of incident image reading camera lens 44 is subject to the imaging effect of image reading lens 44, forms the reduced image of original copy 32 at the sensitive surface of imaging apparatus 36.After this, in the mode identical with the embodiment of previous image read-out, original image is converted to electric signal, reads original copy thus.Above-mentioned image reading lens of the present invention is used at this image reading lens 44.
Figure 28 shows the embodiment of imaging device of the present invention.This imaging device comprises the image read-out 200 being positioned at device top and the imaging section 100 being positioned at this image read-out 200 bottom.Various piece in part this image read-out 200 identical with the embodiment shown in Figure 26 of image read-out 200 also adopts the mark of Figure 26.In addition, this image read-out 200 also can adopt the image read-out shown in Figure 27.
The picture signal that three line ccd line sensors in image read-out 200 and line sensor (imaging apparatus) 36 export is sent to signal processing part 120, processed in this signal processing part 120, be converted into write signal, i.e. the assorted write signal of yellow, redness, cyan, black.
There is in imaging section 100 the cylindrical shape photoconductivity photoreceptor 110 as sub-image bearing member, around this photoreceptor 110, be provided with charging roller 111, wheeled developing apparatus 113, transfer belt 114, cleaning device 115 as charging device.With corona charging device as charging device, charging roller 111 can be replaced.
Based on the write signal of signal processing part 120, light scanning apparatus 117 carries out photoscanning between charging roller 111 and developing apparatus 113, carries out the write on photoreceptor 110.
Mark 116 represents fixing device, and mark 118 represents paper feeding cassette, and mark 119 represents a pair registration roller, and mark 122 represents paper feed roller, and mark 121 represents ADF dish, and mark S represents the transfer paper as recording medium.
During imaging, photoreceptor 110 constant velocity rotation in the direction of the clock, its surface is subject to charging roller 111 and charges and uniform charged, is then subject to the laser light write exposure based on light scanning apparatus 117 and forms electrostatic latent image.This electrostatic latent image machine is done negative sub-image, and image section is exposed.
Along with the rotation of photoreceptor 110, write-once yellow image, red image, cyan image, black image, carry out the light write of image.Each developing cell Y (developing with Yellow toner), M (developing with red toner), C (developing with cyan toner), the K (developing with black toner) of wheeled aobvious hidden device 113 develop to electrostatic latent image bounce-back successively, form positive image, make electrostatic latent image visual, the assorted toner image obtained thus applies roller 114A by means of transfer voltage and is transferred in transfer belt 114 successively, these assorted toner images are overlapped by transfer belt 114, form coloured image.
Paper feeding cassette 118 for receiving transfer paper S can load and unload on imaging device main frame, and under illustrated installment state, picked up and paper supply by paper feed roller 122 for uppermost one of the transfer paper S in paper feeding cassette 118, its leading section is clamped by a pair registration roller 119.
A pair registration roller 119 coordinates toner color image to move to moment in transfer belt 114 transfer position, and transfer paper S is sent to transfer section.In transfer section, the transfer paper S be admitted to is overlapping with color image, under the effect of transfer roll 114B, and static printing coloured image.Transfer paper S is pressed onto on coloured image when transfer printing by transfer roll 114B.
Transfer paper S is admitted to fixing device 116 in transfer printing after coloured image, and in fixing device 116, coloured image is fixed, and is then sent to transfer passage by not shown guiding element, be discharged on ADF dish 121 by a pair not shown exit roller.After assorted toner image transfer printing, cleaning device 115 clean feel body of light 110 surface, removes remaining toner and paper powder etc.
Imaging device, except above-mentioned color image forming apparatus, can also be the imaging device carrying out forming monochrome image.In addition, imaging device is except the wheeled developing apparatus in the imaging device shown in Figure 28, can also be corresponding colored serial arrangement imaging device, this imaging device comprises the imaging section that the processing unit around with the corresponding assorted photoreceptor as red, green, blue or green, black four looks of difference and this photoreceptor is formed.
Claims (12)
1. an image reading lens, wherein sets gradually from object one side:
There is the first arrangement of mirrors sheet of positive refractive power;
There is the second arrangement of mirrors sheet of negative refractive power;
Aperture;
There is the 3rd arrangement of mirrors sheet of positive refractive power; And,
There is the 4th arrangement of mirrors sheet of negative refractive power,
It is characterized in that,
Described first arrangement of mirrors sheet is the meniscus shaped lens of convex surface towards object one side;
Described second arrangement of mirrors sheet is biconcave lens;
Described 3rd arrangement of mirrors sheet is the cemented doublet formed with many pieces of eyeglasses, and the face closest to object one side is the convex surface towards object one side;
Described 4th arrangement of mirrors sheet is the meniscus shaped lens of concave surface towards object one side,
The cemented doublet thickness d of the whole focal length f of described image reading lens, the integral thickness of described image reading lens and total length ∑ d and described 3rd arrangement of mirrors sheet
3gbetween satisfy the following conditional expression (5) and (6),
(5)0.6f＜∑d＜0.9f
(6)0.4＜d
3g/∑d＜0.6，
The d line refractive index nd of the first lens
1, the 5th lens d line refractive index nd
5, the first lens Abbe number vd
1, and the mean value vd of the negative lens of the 3rd arrangement of mirrors sheet and the Abbe number of the 5th lens
45between satisfy the following conditional expression (12) and (13),
(12)-0.2＜nd
1-nd
5＜-0.08
(13)8＜vd
1-vd
45＜32。
2. image reading lens according to claim 1, is characterized in that, described 3rd arrangement of mirrors sheet and the described 4th spacing d of arrangement of mirrors sheet on optical axis
3g-4gbetween satisfy the following conditional expression (7),
(7)0.08＜d
3g-4g/∑d＜0.2。
3. image reading lens according to claim 1, is characterized in that,
With the front arrangement of mirrors sheet that described first arrangement of mirrors sheet and described second arrangement of mirrors sheet are formed, there is negative refractive power, and with the rear arrangement of mirrors sheet that described 3rd arrangement of mirrors sheet and described 4th arrangement of mirrors sheet are formed, there is positive refractive power,
The achromatism condition sum ∑ 1/f v of described front arrangement of mirrors sheet
fg, described rear arrangement of mirrors sheet achromatism condition sum ∑ 1/f v
bg, and the summation ∑ 1/f v of achromatism condition of described image reading lens entirety
allbetween satisfy the following conditional expression (8) and (9)
(8)0.8＜|∑1/f v
fg/∑1/f v
all|＜2
(9)0＜|∑1/f v
bg/∑1/f v
all|＜1。
4. image reading lens according to claim 3, is characterized in that, the achromatism condition sum ∑ 1/f v of described front arrangement of mirrors sheet
fgwith the achromatism condition sum ∑ 1/f v of described rear arrangement of mirrors sheet
bgbetween meet lower conditional (10),
(10)-0.5＜∑1/f v
bg/∑1/f v
fg＜0。
5. image reading lens according to claim 1, is characterized in that, the rearmost radius-of-curvature r of described 3rd arrangement of mirrors sheet
3glwith the radius-of-curvature r of the foremost of described 4th arrangement of mirrors sheet
4gfbetween satisfy the following conditional expression (11),
(11)2＜1/r
3gl-1/r
4gf＜5。
6. image reading lens according to claim 1, is characterized in that, described 3rd arrangement of mirrors head is the balsaming lens formed towards the negative lens of object one side with biconvex lens and concave surface.
7. image reading lens according to claim 6, is characterized in that, the eyeglass effective diameter of biconvex lens forming described 3rd arrangement of mirrors sheet is less than 1.2 with the ratio of lens thickness.
8. image reading lens according to claim 1, is characterized in that, the eyeglass in this image reading lens is glass lens, and not containing arsenic and lead in this eyeglass.
9. image reading lens according to claim 1, is characterized in that, has at least the profile of one piece of eyeglass to be non-circular.
10. an image read-out, it reads original copy information with illuminator and image reading lens, this illuminator is placed on original copy arranges original copy on surface for irradiating, this image reading lens is for being subject to the original copy information imaging of this illuminator irradiation to linear imaging apparatus, it is characterized in that, described image reading lens is the image reading lens in claim 1 ~ 9 described in any one.
11. image read-outs according to claim 10, it is characterized in that, at least there is one piece of catoptron, this catoptron is composing images reading unit together with described illuminator, described image reading lens and described imaging apparatus, this image fetching unit along Manuscript scanner, to read described original copy information.
12. 1 kinds of imaging devices, its original copy information read according to image read-out, exposes image carrier surface, and form image, it is characterized in that, described image read-out is the image read-out described in claim 10 or 11.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2010-204473 | 2010-09-13 | ||
| JP2010204473A JP5574176B2 (en) | 2009-09-14 | 2010-09-13 | Image reading lens, image reading apparatus using the same, and image forming apparatus |
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| Publication Number | Publication Date |
|---|---|
| CN102401979A CN102401979A (en) | 2012-04-04 |
| CN102401979B true CN102401979B (en) | 2015-04-15 |
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| CN (1) | CN102401979B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2552026Y (en) * | 2002-06-17 | 2003-05-21 | 力捷电脑(中国)有限公司 | Short optical path lens |
| JP2007218947A (en) * | 2006-02-14 | 2007-08-30 | Seiko Epson Corp | Image reading lens and image reader |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58132712A (en) * | 1982-02-02 | 1983-08-08 | Minolta Camera Co Ltd | Photographic lens whose total length is short |
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- 2011-09-13 CN CN201110269163.6A patent/CN102401979B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2552026Y (en) * | 2002-06-17 | 2003-05-21 | 力捷电脑(中国)有限公司 | Short optical path lens |
| JP2007218947A (en) * | 2006-02-14 | 2007-08-30 | Seiko Epson Corp | Image reading lens and image reader |
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| CN102401979A (en) | 2012-04-04 |
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