CN102759789A - Fine laser scanning f-theta lens - Google Patents
Fine laser scanning f-theta lens Download PDFInfo
- Publication number
- CN102759789A CN102759789A CN2011101063818A CN201110106381A CN102759789A CN 102759789 A CN102759789 A CN 102759789A CN 2011101063818 A CN2011101063818 A CN 2011101063818A CN 201110106381 A CN201110106381 A CN 201110106381A CN 102759789 A CN102759789 A CN 102759789A
- Authority
- CN
- China
- Prior art keywords
- lens
- cylinder
- laser scanning
- combinatorial
- aspheric surface
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Lenses (AREA)
Abstract
The invention relates to a high-precision scanning reflector laser scanning system F-THETA lens, which sequentially comprises a first lens and a second lens from the object space to the image space, is made of glass, and is suitable for high-precision A3-breadth numeral image laser outputting systems, such as laser printers, medical treatment image equipment and the like. The laser scanning F-THETA lens is good in optical property, high in imaging quality, compact in structure and low in manufacturing cost.
Description
Technical field
The present invention is a kind of F-THETA lens combination that is used for the scanning of scanning reflection mirror high-precision laser bundle; Be applicable to the high resolving power digital image laser output system of multiple use scanning reflection mirror scanning, as: laser printer, digital duplicating machine, medical imaging equipment and other digital image devices etc.
Background technology
The polygon prism laser scanning system utilizes 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 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 point, reproduced original image.The Image Sensor here is exactly a sensitive film in the medical imaging equipment in modern times, in laser printer, digital duplicating machine, is exactly photosensitive drums.
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 has no other modes to replace 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 optical resolution is 600DPI; Higher optical resolution can reach more than the 1200DPI, is the indispensable vitals of various digital image devices.
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 the scanning reflection mirror high-precision laser scanning system F-THETA lens of a kind of good in optical property, image quality height, compact conformation and low cost of manufacture.
The present invention is a kind of scanning reflection mirror high-precision laser scanning system F-THETA lens, 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 glass; 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 glass.First lens, second lens be all Y to rotational symmetry and X to axisymmetric rectangle eyeglass.
Laser scanning F-THETA lens of the present invention; Adopt two Y to aspheric surface and X glass mirror to the cylinder combinatorial surface; Guaranteed the logical optical property that it is fabulous; And through the optimization of asphericity coefficient, revised various aberrations, thereby not only simplified the structure, shortened total mark, improved image quality but also improved resolution; The scanning reflection mirror laser scanning F-THETA lens design of this high resolving power, A3 (297 millimeters) sweep length, its total mark is less than 247 millimeters, and its module length can be less than 160 millimeters; Make it both applicable to small-sized digital image device; Like laser printer, satisfied the requirement of miniaturization preferably, again applicable to large-scale digital image device; Like medical imaging equipment, easy mounting more certainly in large space.
Description of drawings
Fig. 1 is the structural representation of laser scanning F-THETA lens of the present invention;
Fig. 2 is the modulation transfer function figure of laser scanning F-THETA lens of the present invention;
Fig. 3 is the diffraction image analysis chart of laser scanning F-THETA lens 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 laser scanning F-THETA lens of the present invention 55.Its center line AB represents the primary optical axis of lens 55, and A represents object space, and B represents picture side.This laser scanning F-THETA lens also comprise and being positioned on the object space position; Place scanning reflection mirror 4 before first lens 1, place beam shaping lens 5 before the scanning reflection mirror 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.
First lens 1 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 11 and the 2nd Y to aspheric surface and X to cylinder combinatorial surface 12; Second lens 2 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 21 and the 4th Y to aspheric surface and X to cylinder combinatorial surface 22.First lens 1, second lens 2 be all with primary optical axis AB serve as axle respectively Y to rotational symmetry and X to axisymmetric rectangle eyeglass.
First lens 1 adopt optical glass material, and following condition: 1.47＜n＜1.55,55＜v＜65 are satisfied in its refractive index and chromatic dispersion.First lens, 1 material adopts BK7, and its refractive index and chromatic dispersion are respectively n
1=1.517, v
1=64.163.
Scanning reflection mirror 4 is positioned on the object space position; Before placing first lens 1; Comprise a plurality of mirror surfaces; Utilize its rotation, reflecting incident light 7 backs form the incident field angle θ of laser scanning F-THETA lens 55 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 the scanning reflection mirror 4, can the beam shape of incident light 7 be carried out preparatory shaping.Place the light hurdle 6 before the beam shaping lens 5, the size in Guang Lan capable of using hole and shape adjustments light-inletting quantity and diffraction pattern.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 laser scanning F-THETA lens 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 beginning 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 smallest effective clear aperture of Y direction.Wherein Dx can artificially set according to the needs of optics and structure.
Table 1
First lens 1 of laser scanning F-THETA lens of the present invention and second lens 2 are all with primary optical axis AB, and to serve as axle non-ly ask face and at the axisymmetric cylinder combinatorial surface of directions X lens, following aspheric surface equation is satisfied in the aspheric design of its Y direction in that the Y direction is axisymmetric:
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 confirms that through 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 | 2.550037 | 0 | 1.797858E-06 | -1.873701E-10 | -2.670220E-13 | 1.507357E-17 | |
| 12 | Second | 0.347544 | 0 | 2.067658E-06 | -2.469478E-10 | 1.457786E-13 | -5.505589E-17 | |
| 21 | The 3rd | -2.088212 | 0 | -2.952311E-07 | 3.750209E-11 | -5.025617E-15 | 3.078641 |
|
| 22 | Fourth face | -28.524025 | 0 | -1.518090E-07 | 2.964610E-11 | -5.102060E-15 | 3.104760E-19 |
Table 2
It is 18 modulation transfer function MTF when spending at incident field angle θ that Fig. 2 has described laser scanning F-THETA lens 55 of the present invention.It is 18 diffraction patterns when spending at incident field angle θ that Fig. 3 has described laser scanning F-THETA lens 55 of the present invention.
The maximum incident field angle θ of laser scanning F-THETA lens 55 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 scanning reflection mirror can be fit to the digital image laser output system of A3 breadth, like the digital duplicating machine of A3 breadth and the medical imaging equipment of A3 breadth etc. less than 160 millimeters very much.
Be appreciated that; Laser scanning F-THETA lens 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 in table 1 and table 2, describing of laser scanning F-THETA lens of the present invention still belongs to scope of the present invention after accepting or rejecting through rounding up and so on.
Be appreciated that laser scanning F-THETA lens of the present invention in practical application, 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 laser scanning F-THETA lens of the present invention can be applied to multiple digital image laser scanning output system, like laser printer, digital duplicating machine, digital X-ray apparatus, CT scanner, nuclear magnetic resonane scanne etc.
Claims (2)
1. meticulous laser scanning F-THETA lens, 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 processed by glass 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 processed by glass material; 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 55 less than 65; These first lens, second lens be Y to rotational symmetry and X to axisymmetric rectangle eyeglass.
2. meticulous laser scanning F-THETA lens as claimed in claim 1; It is characterized in that: this laser scanning F-THETA lens; It comprises one first lens successively from object space to picture side; One second lens, 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; 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; Following aspheric surface equation is satisfied in the aspheric design of its Y direction:
f(y)＝(Y
2/Ry)/{1+[1-(1+k)×(Y/Ry)
2]
1/2}+aY
2+bY
4+cY
6+dY
8+eY
10
The said laser scanning F-THETA of claim 1 lens parameter is (wherein Dx desirable about 10)
The described laser scanning F-THETA of claim 1 lens, the numerical value of its circular cone coefficient k and offset term coefficient a, b, c, d, e is
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101063818A CN102759789A (en) | 2011-04-27 | 2011-04-27 | Fine laser scanning f-theta lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101063818A CN102759789A (en) | 2011-04-27 | 2011-04-27 | Fine laser scanning f-theta lens |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102759789A true CN102759789A (en) | 2012-10-31 |
Family
ID=47054293
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011101063818A Pending CN102759789A (en) | 2011-04-27 | 2011-04-27 | Fine laser scanning f-theta lens |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102759789A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107577044A (en) * | 2017-09-05 | 2018-01-12 | 大族激光科技产业集团股份有限公司 | Lens group, optical lens assembly and laser cleaning hand-held set |
| CN116449536A (en) * | 2023-06-08 | 2023-07-18 | 深圳市格镭激光科技有限公司 | F-theta optical lens and laser processing system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1844969A (en) * | 2006-05-11 | 2006-10-11 | 王路 | F-THETA lens for laser scanning |
| CN102022977A (en) * | 2010-10-26 | 2011-04-20 | 中国航天科工集团第三研究院第八三五八研究所 | Double-shaft MEMS scanning-based heterodyne interference system and method |
| CN202119964U (en) * | 2011-04-27 | 2012-01-18 | 天津复印技术研究所 | Fine laser scanning f-theta lens |
-
2011
- 2011-04-27 CN CN2011101063818A patent/CN102759789A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1844969A (en) * | 2006-05-11 | 2006-10-11 | 王路 | F-THETA lens for laser scanning |
| CN102022977A (en) * | 2010-10-26 | 2011-04-20 | 中国航天科工集团第三研究院第八三五八研究所 | Double-shaft MEMS scanning-based heterodyne interference system and method |
| CN202119964U (en) * | 2011-04-27 | 2012-01-18 | 天津复印技术研究所 | Fine laser scanning f-theta lens |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107577044A (en) * | 2017-09-05 | 2018-01-12 | 大族激光科技产业集团股份有限公司 | Lens group, optical lens assembly and laser cleaning hand-held set |
| CN116449536A (en) * | 2023-06-08 | 2023-07-18 | 深圳市格镭激光科技有限公司 | F-theta optical lens and laser processing system |
| CN116449536B (en) * | 2023-06-08 | 2023-08-11 | 深圳市格镭激光科技有限公司 | F-theta optical lens and laser processing system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US20200241252A1 (en) | Photographing module and electronic device | |
| JP4560558B2 (en) | Image reading apparatus and image forming apparatus | |
| JPWO2009011153A1 (en) | Image reading device | |
| JPH10232346A (en) | Scanning optical device | |
| JP2010134430A (en) | Scanning optical apparatus and image forming apparatus using the same | |
| CN202119964U (en) | Fine laser scanning f-theta lens | |
| TW460712B (en) | Optical imaging system | |
| US8749864B2 (en) | Image reading optical system and image reading apparatus | |
| WO2013031163A1 (en) | Upright unit-magnification lens array unit, image reading device and image forming device | |
| CN102759789A (en) | Fine laser scanning f-theta lens | |
| CN1844969A (en) | F-THETA lens for laser scanning | |
| JPH11249013A (en) | Image forming lens and optical device using the same | |
| WO2011135771A1 (en) | Two-dimensional scanner | |
| CN202018538U (en) | F-THETA laser scanning system module | |
| JPH0643361A (en) | Image reading lens | |
| US8274716B2 (en) | Image reading apparatus and method of controlling the same | |
| US7286274B2 (en) | Optical scanner and image forming apparatus using the same | |
| CN102062931A (en) | Laser scanning lens | |
| JP2000249914A (en) | Lens for reading image and image reader | |
| JP2001281603A (en) | Collimator lens and optical scanner using the same | |
| JP2011166568A (en) | Adjustment reference chart for image reader and optical evaluation method employing the same | |
| JP5683130B2 (en) | Image reading apparatus using image reading lens | |
| WO2014132644A1 (en) | Upright equal magnification lens array unit, image reading device, and image forming device | |
| Lei et al. | Design of a compact and high-resolution image scanner with large depth-of-field based on compound eye system | |
| JP4163449B2 (en) | Reading lens and image reading apparatus |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20121031 |