CN1844969A - F-THETA lens for laser scanning - Google Patents
F-THETA lens for laser scanning Download PDFInfo
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- CN1844969A CN1844969A CN 200610013649 CN200610013649A CN1844969A CN 1844969 A CN1844969 A CN 1844969A CN 200610013649 CN200610013649 CN 200610013649 CN 200610013649 A CN200610013649 A CN 200610013649A CN 1844969 A CN1844969 A CN 1844969A
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- lens
- laser scanning
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- theta
- aspheric surface
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Abstract
The invention discloses an F-THETA lens of six-prism laser scanner. Wherein, from object to image, there are first lens and second lens which are made from plastics. The invention can be used in the digital image laser output system with A3 size, as laser printer, etc. the invention has better optical property, high image quality and lower cost.
Description
Technical field
The present invention is a kind of F-THETA lens system that is used for six prism laser beam flyings, be applicable to the digital image laser output system of multiple use six prisms scanning, as: laser printer, digital duplicating machine, medical imaging equipment and other digital image devices etc.
Background technology
The polygon prism laser scanning system, utilize the polygon prism of high speed rotating, reflection through ovennodulation, comprising view data and view data laser beam along with the time linear expansion, through one group of F-THETA camera lens, focus on the photosensitive surface of Image Sensor after the correction and form line scanning, simultaneously, utilize the machinery perpendicular to direction of line scan of photosensitive surface to move, view data is recovered at the photosensitive surface of Image Sensor with the form of laser spots, reproduced original image.The Image Sensor here is exactly a sensitive film in the modern medical service image documentation equipment, is exactly photosensitive drums in laser printer, digital duplicating machine.
The polygon prism laser scanning system is the digital image output system of the indispensability of modern digital image device, and what it adopted is modern state-of-the-art, unique digital image laser way of output, also can replace without any other modes at present.
The polygon prism laser scanning system comprise low speed, at a high speed, single laser beam, multi-laser beam, black and white, colour etc., its most frequently used resolution is 600DPI, and higher resolution can also be provided certainly, is the vitals of various digital image device indispensabilities.
At the tens million of cover polygon prism of China's year demand laser scanning system, dependence on import always.
Therefore, developing a kind of good in optical property, image quality height, compact conformation and polygon prism laser scanning system with low cost is very important.
Summary of the invention
The object of the present invention is to provide six prism laser scanning system F-THETA camera lenses of a kind of good in optical property, image quality height, compact conformation and low cost of manufacture.
Another object of the present invention is to provide the six prism laser scanning system modules of using this F-THETA camera lens.
The present invention is a kind of six prism laser scanning system F-THETA camera lenses, and it comprises one first lens, one second lens successively from object space to picture side.First lens be two-sided Y to aspheric surface, X to cylinder combinatorial surface lens, comprise a Y to aspheric surface and X to cylinder combinatorial surface and the 2nd Y to aspheric surface and X to the cylinder combinatorial surface, its material is a plastic cement, second lens be two-sided Y to aspheric surface, X to cylinder combinatorial surface lens, comprise the 3rd Y to aspheric surface and X to cylinder combinatorial surface and the 4th Y to aspheric surface and X to the cylinder combinatorial surface, its material is a plastic cement.First lens, second lens be all Y to rotational symmetry and X to axisymmetric rectangle eyeglass.
F-THETA lens for laser scanning of the present invention, adopt two Y to aspheric surface and X plastic lens to the cylinder combinatorial surface, guaranteed its logical preferably optical property, and optimization by asphericity coefficient, revised various aberrations, thereby not only simplified the structure, shortened total mark, improved image quality but also improved resolution; The six prism F-THETA lens for laser scanning design of this high resolving power, A3 (297 millimeters) sweep length, its total mark is less than 247 millimeters, its module length can be less than 160 millimeters, make it both applicable to small-sized digital image device, as laser printer, satisfied the requirement of miniaturization preferably, again applicable to large-scale digital image device, as medical imaging equipment, easier certainly installation in large space; Owing to adopt plastic lens, but jet modling process in enormous quantities, cut down finished cost.
Description of drawings
Fig. 1 is the structural representation of F-THETA lens for laser scanning of the present invention;
Fig. 2 is the diffraction image analysis chart of F-THETA lens for laser scanning of the present invention.
Embodiment
With reference to Fig. 1, it comprises one first lens, 1, one second lens 2 successively from object space to picture side F-THETA lens for laser scanning of the present invention 50.The primary optical axis of its center line AB representative shot 50, A represents object space, and B represents picture side.This F-THETA lens for laser scanning also comprises and being positioned on the object space position, place six prisms 4 before first lens 1, place beam shaping lens 5 before six prisms 4, place the light hurdle 6 before the beam shaping lens 5 and be positioned at the image aspect and put, place the Image Sensor 3 behind second lens 2, this Image Sensor 3 comprises an imaging surface 31.
Six prisms 4 are positioned on the object space position, before placing first lens 1, comprise six mirror surfaces, utilize its rotation, reflection incident light 7 backs form the incident field angle θ of F-THETA lens for laser scanning 50 of the present invention, and the scanning at θ angle also finally forms the line scanning of data spot on imaging surface 31.Place the beam shaping lens 5 before six prisms 4, the beam shape of incident light 7 can be carried out pre-shaping.Place the light hurdle 6 before the beam shaping lens 5, can utilize size and the shape adjustments light-inletting quantity and the diffraction pattern in Guang Lan hole.Being positioned at the image aspect and putting, place the Image Sensor 3 behind second lens 2, comprise an imaging surface 31, can be sensitive film, sensitization band, photosensitive drums and so on photosensitive device usually.
With reference to table 1, the related parameter values of F-THETA lens for laser scanning optical system of the present invention, it is described from the fourth face 22 of first 11 to second lens 2 of first lens 1 successively, wherein radius of curvature R x and the Ry X that is respectively each face and primary optical axis AB surface of intersection to Y to radius-of-curvature; Spacing is for to begin the distance of front with respect to the back along primary optical axis AB direction by object space A; Effectively clear aperture Dx and Dy are respectively the directions X of each face and the maximum effectively clear aperture of Y direction.Wherein Dx can artificially set according to the needs of optics and structure.
| Label | The surface | Radius-of-curvature (mm) | Spacing (mm) | Effective clear aperture (mm) | Material | ||
| Rx | Ry | Dx | Dy | ||||
| 11 | First | -51.669507 | -83.093245 | 14.817637 | - | 72.720606 | PMMA |
| 12 | Second | -33.947194 | -50.096064 | 17.071168 | - | 81.693966 | |
| 21 | The 3rd | -111.015017 | 122.101531 | 17.000008 | - | 155.536312 | PMMA |
| 22 | Fourth face | -26.371605 | 149.519917 | - | - | 161.535078 | |
Table 1
f(y)＝(Y
2/Ry)/{1+[1-(1+k)×(Y/Ry)
2]
1/2}+aY
2+bY
4+cY
6+dY
8+eY
10
F in the formula (y) is the distance of the Y direction aspheric surface intersection point of light and each face 11,12,21,22 in primary optical axis AB direction; Y is the distance of the Y direction aspheric surface intersection point of light and each face 11,12,21,22 in the Y direction; Ry is a Y directional curvature radius; K is the circular cone coefficient; A, b, c, d, e are respectively secondary, four times, six times, eight times and ten offset term coefficients.The aspheric shape of Y direction of each face 11,12,21,22 all determines that by above-mentioned equation its radius of curvature R y value is explained in table 1, the numerical value of circular cone coefficient k and offset term coefficient a, b, c, d, e is explained in table 2.
| Label | The surface | The circular cone coefficient k | a | b | | d | e | |
| 11 | First | -2.526973 | 0 | 1.543808E-06 | -1.107422E-10 | -4.201144E-13 | -3.599955E-17 | |
| 12 | Second | 0.192615 | 0 | 2.523073E-06 | -2.120370E-10 | 2.451530E-13 | -1.002434 |
|
| 21 | The 3rd | -4.230829 | 0 | -1.911010E-07 | 2.295452E-11 | -4.831438E-15 | 3.574323 |
|
| 22 | Fourth face | -32.097121 | 0 | -1.498845E-07 | 2.602388E-11 | -5.604006E-15 | 3.451953E-19 |
Table 2
It is 0 diffraction image analysis when spending at incident field angle θ that Fig. 2 has described F-THETA lens for laser scanning 50 of the present invention.
The maximum incident field angle θ of F-THETA lens for laser scanning 50 of the present invention can reach ± 51 degree, can form the line scanning width that surpasses 297 millimeters (A3 width) at imaging surface 31, and can reach higher optical resolution, its module total length comprises that six prisms can be less than 160 millimeters, the digital image laser output system that is fit to very much the A3 breadth is as the digital duplicating machine of A3 breadth and the medical imaging equipment of A3 breadth etc.
Be appreciated that, F-THETA lens for laser scanning die set of the present invention is in the unit box of a special use, after second lens 2, can increase the dustproof glass of sheet glass between second lens 2 and the imaging surface 31, and can not influence final image quality on imaging surface 31 as unit box.
Be appreciated that and consider computational accuracy that the parameters value of describing of F-THETA lens for laser scanning of the present invention still belongs to scope of the present invention after accepting or rejecting through rounding up and so in table 1 and table 2.
Be appreciated that F-THETA lens for laser scanning of the present invention in actual applications, the actual bore numerical value of its each eyeglass should be bigger slightly than effective clear aperture numerical value of describing in the table 1, should still belong to scope of the present invention.
Be appreciated that F-THETA lens for laser scanning module of the present invention in actual applications, six prisms can be replaced by eight prisms or 12 prisms etc., to obtain the line scanning of different demands.
Be appreciated that F-THETA lens for laser scanning of the present invention can be applied to multiple digital image laser scanning output system, as laser printer, digital duplicating machine, digital X-ray apparatus, CT scanner, nuclear magnetic resonane scanne etc.
Claims (8)
1, a kind of F-THETA lens for laser scanning, it comprises one first lens, one second lens successively from object space to picture side.It is characterized in that: these first lens be two-sided Y to aspheric surface, X to cylinder combinatorial surface lens, comprise a Y to aspheric surface and X to cylinder combinatorial surface and the 2nd Y to aspheric surface and X to the cylinder combinatorial surface, this eyeglass is made by plastic cement material; These second lens be two-sided Y to aspheric surface, X to cylinder combinatorial surface lens, comprise the 3rd Y to aspheric surface and X to cylinder combinatorial surface and the 4th Y to aspheric surface and X to the cylinder combinatorial surface, this eyeglass is made by plastic cement material.
2, F-THETA lens for laser scanning as claimed in claim 1 is characterized in that: these first lens, second lens be Y to rotational symmetry and X to axisymmetric rectangle eyeglass.
3, F-THETA lens for laser scanning as claimed in claim 1 is characterized in that: the refractive index of these first lens, second lens is all greater than 1.47 less than 1.55, its chromatic dispersion all greater than 50 less than 60.
4, F-THETA lens for laser scanning as claimed in claim 1 is characterized in that: this F-THETA lens for laser scanning further comprises one or six prisms, and it places the front of first lens.
5, F-THETA lens for laser scanning as claimed in claim 1 is characterized in that: this F-THETA lens for laser scanning further comprises a beam shaping lens, and it places the front of six prisms.
6, F-THETA lens for laser scanning as claimed in claim 1 is characterized in that: this F-THETA lens for laser scanning further comprises Yi Guanglan, and it places the front of beam shaping lens.
7, a kind of application rights requires the laser scanning system module of 1 described F-THETA lens for laser scanning, it comprises: Yi Guanglan, one beam shaping lens, one or six prisms, one F-THETA lens for laser scanning, one Image Sensor, this Image Sensor has an imaging surface, it is characterized in that: this F-THETA lens for laser scanning, it comprises one first lens successively from object space to picture side, one second lens, these first lens are that two-sided Y is to aspheric surface, X is to cylinder combinatorial surface lens, comprise a Y to aspheric surface and X to cylinder combinatorial surface and the 2nd Y to aspheric surface and X to the cylinder combinatorial surface; These second lens be two-sided Y to aspheric surface, X to cylinder combinatorial surface lens, comprise the 3rd Y to aspheric surface and X to cylinder combinatorial surface and the 4th Y to aspheric surface and X to the cylinder combinatorial surface; Described F-THETA lens for laser scanning parameter is
Label The surface Radius-of-curvature (mm) Spacing (mm) Effective clear aperture (mm) Material
Rx Ry Dx Dy
11 First -51.669507 -83.093245 14.817637 - 72.720606 PMMA
12 Second -33.947194 -50.096064 17.071168 - 81.693966
21 The 3rd -111.015017 122.101531 17.000008 - 155.536312 PMMA
22 Fourth face -26.371605 149.519917 - - 161.535078
。
8, F-THETA lens for laser scanning as claimed in claim 7 is characterized in that: the numerical value of its circular cone coefficient k and offset term coefficient a, b, c, d, e is
Label The surface The circular cone coefficient k a b c d e
11 First -2.526973 0 1.543808E-06 -1.107422E-10 -4.201144E-13 -3.599955E-17
12 Second 0.192615 0 2.523073E-06 -2.120370E-10 2.451530E-13 -1.002434E-16
21 The 3rd -4.230829 0 -1.911010E-07 2.295452E-11 -4.831438E-15 3.574323E-19
22 Fourth face -32.097121 0 -1.498845E-07 2.602388E-11 -5.604006E-15 3.451953E-19
。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610013649 CN1844969A (en) | 2006-05-11 | 2006-05-11 | F-THETA lens for laser scanning |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610013649 CN1844969A (en) | 2006-05-11 | 2006-05-11 | F-THETA lens for laser scanning |
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| Publication Number | Publication Date |
|---|---|
| CN1844969A true CN1844969A (en) | 2006-10-11 |
Family
ID=37063911
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200610013649 Pending CN1844969A (en) | 2006-05-11 | 2006-05-11 | F-THETA lens for laser scanning |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101937130A (en) * | 2009-06-30 | 2011-01-05 | 佳能株式会社 | Optical scanning apparatus |
| CN101650476B (en) * | 2008-08-15 | 2012-03-21 | 一品光学工业股份有限公司 | Two-element ftheta lens for MEMS laser scanning unit |
| CN102759789A (en) * | 2011-04-27 | 2012-10-31 | 天津复印技术研究所 | Fine laser scanning f-theta lens |
| CN109407258A (en) * | 2017-08-17 | 2019-03-01 | 信泰光学(深圳)有限公司 | Lens assembly |
-
2006
- 2006-05-11 CN CN 200610013649 patent/CN1844969A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101650476B (en) * | 2008-08-15 | 2012-03-21 | 一品光学工业股份有限公司 | Two-element ftheta lens for MEMS laser scanning unit |
| CN101937130A (en) * | 2009-06-30 | 2011-01-05 | 佳能株式会社 | Optical scanning apparatus |
| CN102759789A (en) * | 2011-04-27 | 2012-10-31 | 天津复印技术研究所 | Fine laser scanning f-theta lens |
| CN109407258A (en) * | 2017-08-17 | 2019-03-01 | 信泰光学(深圳)有限公司 | Lens assembly |
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