CN108717226B - Laser medical f-theta optical lens - Google Patents
Laser medical f-theta optical lens Download PDFInfo
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- CN108717226B CN108717226B CN201810898889.8A CN201810898889A CN108717226B CN 108717226 B CN108717226 B CN 108717226B CN 201810898889 A CN201810898889 A CN 201810898889A CN 108717226 B CN108717226 B CN 108717226B
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- 230000003287 optical effect Effects 0.000 title claims abstract description 54
- 230000005540 biological transmission Effects 0.000 claims abstract description 8
- 210000001747 pupil Anatomy 0.000 claims abstract description 4
- 239000000463 material Substances 0.000 claims description 12
- 239000005308 flint glass Substances 0.000 claims description 8
- 229910052746 lanthanum Inorganic materials 0.000 claims description 8
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 claims description 8
- 239000005331 crown glasses (windows) Substances 0.000 claims description 4
- 206010040925 Skin striae Diseases 0.000 abstract description 6
- 231100000241 scar Toxicity 0.000 abstract description 6
- 230000003796 beauty Effects 0.000 abstract description 5
- 230000037303 wrinkles Effects 0.000 abstract description 4
- 206010052428 Wound Diseases 0.000 abstract description 3
- 208000027418 Wounds and injury Diseases 0.000 abstract description 3
- 230000004075 alteration Effects 0.000 description 3
- 238000012937 correction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 238000003384 imaging method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000013307 optical fiber Substances 0.000 description 2
- 230000001225 therapeutic effect Effects 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 235000002673 Dioscorea communis Nutrition 0.000 description 1
- 241000544230 Dioscorea communis Species 0.000 description 1
- 208000008589 Obesity Diseases 0.000 description 1
- 208000035753 Periorbital contusion Diseases 0.000 description 1
- 206010039580 Scar Diseases 0.000 description 1
- 208000031439 Striae Distensae Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 210000003128 head Anatomy 0.000 description 1
- 238000012886 linear function Methods 0.000 description 1
- 235000020824 obesity Nutrition 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000035935 pregnancy Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/0005—Optical objectives specially designed for the purposes specified below having F-Theta characteristic
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
- A61B18/18—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by applying electromagnetic radiation, e.g. microwaves
- A61B18/20—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by applying electromagnetic radiation, e.g. microwaves using laser
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
- G02B19/0004—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed
- G02B19/0009—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed having refractive surfaces only
- G02B19/0014—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed having refractive surfaces only at least one surface having optical power
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
- A61B18/18—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by applying electromagnetic radiation, e.g. microwaves
- A61B18/20—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by applying electromagnetic radiation, e.g. microwaves using laser
- A61B2018/2035—Beam shaping or redirecting; Optical components therefor
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
- A61B18/18—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by applying electromagnetic radiation, e.g. microwaves
- A61B18/20—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by applying electromagnetic radiation, e.g. microwaves using laser
- A61B2018/2035—Beam shaping or redirecting; Optical components therefor
- A61B2018/20553—Beam shaping or redirecting; Optical components therefor with special lens or reflector arrangement
Landscapes
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Surgery (AREA)
- Heart & Thoracic Surgery (AREA)
- Otolaryngology (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Medical Informatics (AREA)
- Molecular Biology (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Radiation-Therapy Devices (AREA)
Abstract
The invention relates to a laser medical f-theta optical lens, which comprises a first lens, a second lens and a third lens which are sequentially arranged along the transmission direction of incident light, wherein the first lens is a concave-convex negative lens, the second lens is a concave-convex positive lens, the third lens is a biconvex positive lens, and the light incident surface and the light emergent surface of the first lens and the third lens are both bent towards the transmission direction of the light; the field angle 2ω=50° of the f-theta optical lens has an entrance pupil diameter of not more than 6mm and a scanning range of 51mm×51mm. The invention can solve the problems of low treatment speed, wound treatment and the like caused by overlarge spot diameter at a treatment focus due to small scanning area in the current noninvasive laser beauty industry, such as striae gravidarum repair, scar repair, skin tendering, wrinkle removal and the like, thereby meeting the requirements of noninvasive skin replacement and scar repair in the laser beauty industry.
Description
Technical Field
The invention belongs to the technical field of optical lenses, and relates to a laser medical f-theta optical lens.
Background
With the development of laser technology, a brand-new application discipline, namely laser medicine, is gradually formed, and the unique advantages of laser solve a plurality of problems which cannot be solved in basic research and clinical application of traditional medicine, and pay attention to medical circles at home and abroad. In the field of laser skin cosmetology, in particular to striae gravidarum repair; scar repair (caesarean scar, burn scar, etc.); stretch marks (striae gravidarum, striae obesity, etc.) are improved; tendering skin and removing wrinkles (aged wrinkles, large pores, rough skin, etc.); for the treatment of removing pigment such as black eye, it is common to use a non-stripped 1550nm optical fiber lattice laser therapeutic apparatus. The treatment head of the therapeutic apparatus is a handheld scanner; the scanner comprises an f-theta optical lens besides a scanning vibrating mirror.
The f-theta optical lens is an optical lens with controllable laser scanning speed by introducing negative distortion to realize that light rays move at a constant speed, namely, the scanning rotation angle and the movement of an image point on an imaging surface are in linear function relation. Because the scanner needs to be held for a long time to treat the skin of an affected part of a human body, compared with the industry, the scanner has the advantages that the clear aperture of an optical lens is smaller, the weight is lighter, and the scanning range is smaller. The f-theta optical lens for 1550nm lattice laser has the advantages that the maximum scanning range for treatment is small, the scanning range of the f-theta optical lens for medical laser on the market is limited, the f-theta optical lens with the scanning range exceeding 50mm multiplied by 50mm is not available, large-area rapid treatment is difficult to realize, and the scanning linearity is poor due to the adoption of a larger scanning range. In addition, the diameter of a scanning light spot of the 1550nm optical fiber lattice laser at a focal point is generally larger, so that wounds are easily caused to the treated skin, and recovery is not facilitated; the requirements of rapid and noninvasive treatment cannot be met.
Disclosure of Invention
The invention aims to overcome the defects, and provides a laser medical f-theta optical lens which can solve the problems of slow treatment speed, treatment wounds and the like caused by small treatment areas such as striae of pregnancy, scar repair, skin tendering, wrinkle removal and the like in the existing noninvasive laser beauty industry, and can meet the requirements of noninvasive skin replacement and scar repair in the laser beauty industry.
In order to achieve the above purpose, the present invention provides the following technical solutions:
The f-theta optical lens comprises a first lens, a second lens and a third lens which are sequentially arranged along the transmission direction of incident light, wherein the first lens is a concave-convex negative lens, the second lens is a concave-convex positive lens, the third lens is a biconvex positive lens, and the light incident surface and the light emergent surface of the first lens and the third lens are bent to the transmission direction of the light; the field angle 2ω=50° of the f-theta optical lens is not larger than 6mm in entrance pupil diameter, and the scanning range is 51mm×51mm.
Further, the focal length of each lens is respectively as follows with the system focal length of the f-theta optical lens:
-0.7＜f1/f＜-0.5
0.7＜f2/f＜0.9
1.0＜f3/f＜1.1
Wherein f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, and f is the system focal length of the f-theta optical lens.
Further, the focal length of each lens and the system focal length of the f-theta optical lens respectively meet f 1/f= -0.572; f2/f=0.737; f3/f=1.077.
Further, in the above-mentioned laser medical f-theta optical lens, the first lens includes a first curved surface and a second curved surface, wherein the radius of curvature of the first curved surface is-19.7 mm, and the radius of curvature of the second curved surface is-112.15 mm; the center thickness of the first lens is 2.1mm.
Further, in the above-mentioned laser medical f-theta optical lens, the second lens includes a third curved surface and a fourth curved surface, wherein the radius of curvature of the third curved surface is-72.6 mm, and the radius of curvature of the fourth curved surface is-30.22 mm; the center thickness of the second lens was 7.48mm.
Further, in the above-mentioned laser medical f-theta optical lens, the third lens includes a fifth curved surface and a sixth curved surface, wherein a radius of curvature of the fifth curved surface is 1940.88mm, and a radius of curvature of the sixth curved surface is-72.72 mm; the center thickness of the third lens is 9.54mm.
Further, in the above-mentioned laser medical f-theta optical lens, the material of the first lens is crown glass, and the refractive index of the first lens is 1.52; the material of the second lens is lanthanum flint glass, and the refractive index of the second lens is 1.80; the material of the third lens is lanthanum flint glass, and the refractive index of the third lens is 1.80.
Further, in the above-mentioned laser medical f-theta optical lens, the distance between the first lens and the laser scanning galvanometer is between 16mm and 24 mm.
Further, in the above-mentioned laser medical f-theta optical lens, a distance between the first lens and the second lens on the optical axis is 1.25mm; the distance between the second lens and the third lens on the optical axis is 1.30mm.
Further, the laser has a wavelength of 1550 nm.
The invention has the beneficial effects that: the invention adopts three-piece f-theta optical lens design, and well corrects aberration. The laser-assisted X/Y scanning galvanometer is matched with the laser-assisted beauty treatment X/Y scanning galvanometer to realize the linear scanning of a half field angle of 0-25 degrees, the scanning area is large, and the light spot at the focus reaches the diffraction limit; realizing large-area, small-focus light spot and rapid noninvasive treatment.
Drawings
FIG. 1 is a schematic structural view of a laser medical f-theta optical lens of the present invention.
FIG. 2 is a ray trace of the laser medical f-theta optical lens of the present invention.
FIG. 3 is a plot of diffuse flare for a laser medical f-theta optical lens of the present invention.
FIG. 4 is a graph of the curvature of field and distortion of a laser medical f-theta optical lens of the present invention.
FIG. 5 is a graph showing the MTF curve of the optical transfer function of the laser medical f-theta optical lens of the present invention.
Detailed Description
Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a medical f-theta optical lens of the present invention, in which a first lens L1, a second lens L2 and a third lens L3 are sequentially disposed along an incident light transmission direction, where the first lens L1 is a concave-convex negative lens, the second lens L2 is a concave-convex positive lens, the third lens L3 is a biconvex positive lens, and light incident surfaces and light emergent surfaces of the first lens L1 and the third lens L3 are both bent toward the light transmission direction; the field angle 2ω=50° of the f-theta optical lens has an entrance pupil diameter of 6mm and a scanning range of 51mm×51mm, and the laser light may be a laser light having a wavelength around 1550 nm.
In this embodiment, the focal length of each lens and the focal length of the f-theta optical lens respectively satisfy:
-0.7＜f1/f＜-0.5
0.7＜f2/f＜0.9
1.0＜f3/f＜1.1
Wherein f1 is the focal length of the first lens L1, f2 is the focal length of the second lens L2, f3 is the focal length of the third lens L3, and f is the system focal length of the f-theta optical lens. The focal length of each lens preferentially meets the f 1/f= -0.572 with the system focal length of the f-theta optical lens respectively; f2/f=0.737; f3/f=1.077.
The first lens L1 comprises a first curved surface S1 and a second curved surface S2, wherein the curvature radius of the first curved surface S1 is-19.7 mm, and the curvature radius of the second curved surface S2 is-112.15 mm; the center thickness d1 of the first lens L1 is 2.1mm.
The second lens L2 comprises a third curved surface S3 and a fourth curved surface S4, wherein the curvature radius of the third curved surface S3 is 72.6mm below zero, and the curvature radius of the fourth curved surface S4 is 30.22mm below zero; the center thickness d3 of the second lens L2 is 7.48mm.
The third lens L3 comprises a fifth curved surface S5 and a sixth curved surface S6, wherein the curvature radius of the fifth curved surface S5 is 1940.88mm, and the curvature radius of the sixth curved surface S6 is 72.72mm below zero; the center thickness d5 of the third lens L3 is 9.54mm.
The material of the first lens L1 is crown glass, and the refractive index of the first lens L1 is 1.52; the material of the second lens L2 is lanthanum flint glass, and the refractive index of the second lens L2 is 1.80; the material of the third lens L3 is lanthanum flint glass, and the refractive index of the third lens L3 is 1.80.
It should be noted that, as a preferred embodiment, in this embodiment, the material of the first lens L1 is selected to be H-K9L in crown glass; selecting a material of the second lens L2 as H-ZLAF E in heavy lanthanum flint glass; and selecting a material of the third lens L3 to be H-ZLAF E in heavy lanthanum flint glass.
The distance between the first lens L1 and the laser scanning galvanometer is 16-24 mm, and the distance d2 between the first lens L1 and the second lens L2 on the optical axis is 1.25mm; a distance d4 between the second lens L2 and the third lens L3 on the optical axis is 1.30mm; the distance d6 between the third lens L3 and the imaging surface on the optical axis is 101.3mm.
The specific structural parameters are shown in the following table:
FIG. 2 is a ray trace of the laser medical f-theta optical lens of the present invention. The laser scan radius r in the figure is 36.6mm, so that the scan range can reach a diameter range of phi 72mm, and since the laser beam is generally required to be perpendicular to the skin area to be treated, the scannable effective diameter is 73×0.707=51 mm, and the scannable effective range is 51mm×51mm.
FIG. 3 is a schematic view of diffuse flare of the laser medical f-theta optical lens of the present invention. As shown in the figure, the dispersed light spots of each view field are all in the Airy spot, and the aberration correction reaches the diffraction limit, so that the aberration correction is well corrected.
FIG. 4 is a schematic diagram of the curvature of field and distortion of the laser medical f-theta optical lens of the present invention. As shown in the figure, the maximum curvature of field is within 0.3mm, and the distortion is less than 0.01%.
FIG. 5 is a schematic view of MTF curve of the laser medical f-theta optical lens of the present invention. As shown, the optical transfer function MTF at 1550nm is near the diffraction limit.
While the foregoing is directed to a preferred embodiment of the present invention, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the principles of the invention, and such changes and modifications are intended to be included within the scope of the invention.
Claims (3)
1. The f-theta optical lens is characterized by comprising a first lens, a second lens and a third lens which are sequentially arranged along the transmission direction of incident light, wherein the first lens is a concave-convex negative lens, the second lens is a concave-convex positive lens, the third lens is a biconvex positive lens, and the light incident surface and the light emergent surface of the first lens and the third lens are bent to the transmission direction of the light; the field angle 2ω=50° of the f-theta optical lens, the entrance pupil diameter is not more than 6mm, the scanning range is 51mm×51mm, and the focal length of each lens and the system focal length of the f-theta optical lens respectively satisfy f1/f= -0.572; f2/f=0.737; f3/f=1.077, the first lens comprises a first curved surface and a second curved surface, wherein the radius of curvature of the first curved surface is-19.7 mm, and the radius of curvature of the second curved surface is-112.15 mm; the center thickness of the first lens is 2.1mm, the second lens comprises a third curved surface and a fourth curved surface, wherein the radius of curvature of the third curved surface is 72.6mm below zero, and the radius of curvature of the fourth curved surface is 30.22mm below zero; the center thickness of the second lens is 7.48mm, the third lens comprises a fifth curved surface and a sixth curved surface, wherein the curvature radius of the fifth curved surface is 1940.88mm, and the curvature radius of the sixth curved surface is-72.72 mm; the center thickness of the third lens is 9.54mm, and the distance between the first lens and the second lens on the optical axis is 1.25mm; the distance between the second lens and the third lens on the optical axis is 1.30mm, the material of the first lens is crown glass, and the refractive index of the first lens is 1.52; the material of the second lens is lanthanum flint glass, and the refractive index of the second lens is 1.80; the material of the third lens is lanthanum flint glass, and the refractive index of the third lens is 1.80.
2. The laser medical f-theta optical lens of claim 1, wherein the distance between the first lens and the laser scanning galvanometer is between 16mm and 24 mm.
3. The laser medical f-theta optical lens according to claim 1 or 2, wherein the laser has a wavelength of 1550 nm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810898889.8A CN108717226B (en) | 2018-08-08 | 2018-08-08 | Laser medical f-theta optical lens |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810898889.8A CN108717226B (en) | 2018-08-08 | 2018-08-08 | Laser medical f-theta optical lens |
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| Publication Number | Publication Date |
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| CN108717226A CN108717226A (en) | 2018-10-30 |
| CN108717226B true CN108717226B (en) | 2024-07-26 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114326055B (en) * | 2021-12-30 | 2024-01-12 | 深圳市韵腾激光科技有限公司 | Infrared field lens with large scanning angle |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101369047A (en) * | 2008-04-28 | 2009-02-18 | 深圳市大族激光科技股份有限公司 | Optical lens |
| CN208636554U (en) * | 2018-08-08 | 2019-03-22 | 深圳市吉斯迪科技有限公司 | A kind of medical F-theta optical lens of laser |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2673591B2 (en) * | 1989-12-20 | 1997-11-05 | キヤノン株式会社 | fθ lens and laser scanning optical system using the same |
| US6123425A (en) * | 1996-04-26 | 2000-09-26 | Minolta Co., Ltd. | Projecting optical system |
| JP2004029416A (en) * | 2002-06-26 | 2004-01-29 | Dainippon Screen Mfg Co Ltd | Optical scanner |
| CN101881875B (en) * | 2010-06-22 | 2011-09-28 | 深圳市大族激光科技股份有限公司 | F-theta optical lens |
| CN104570285B (en) * | 2015-02-05 | 2017-01-18 | 大族激光科技产业集团股份有限公司 | F-theta optical lens and laser processing system |
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- 2018-08-08 CN CN201810898889.8A patent/CN108717226B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101369047A (en) * | 2008-04-28 | 2009-02-18 | 深圳市大族激光科技股份有限公司 | Optical lens |
| CN208636554U (en) * | 2018-08-08 | 2019-03-22 | 深圳市吉斯迪科技有限公司 | A kind of medical F-theta optical lens of laser |
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