CN101866044B

CN101866044B - Optical lens

Info

Publication number: CN101866044B
Application number: CN2010101854237A
Authority: CN
Inventors: 李家英; 周朝明; 高云峰
Original assignee: Shenzhen Hans Laser Technology Co Ltd
Current assignee: Han s Laser Technology Industry Group Co Ltd
Priority date: 2010-05-27
Filing date: 2010-05-27
Publication date: 2011-12-07
Anticipated expiration: 2030-05-27
Also published as: CN101866044A

Abstract

The invention relates to an optical lens applying ultraviolet laser, which comprises a first lens, a second lens and a third lens sequentially lined in the incidence direction of a light beam; the first lens is a double-concave lens; the second lens is a meniscus-shaped lens, and the curved surface thereof bends towards the incidence direction of the light; the third lens is a double-convex lens; and wherein the optical lens is used for the ultraviolet laser with the focal length of 160mm and the wavelength of 355nm, and a processing area with the processing scope of 100*100*90mm<3> and the processing depth of 157 to 67mm. The optical lens can carry out plane or three-dimensional imaging marking on the surface of or inside a medium, so that carved points are finer, clearer, more uniform and do not deform, thereby not only improving the quality of internally carved products but also improving the working efficiency.

Description

A kind of optical lens

[technical field]

The present invention relates to the optical lens that carving is used in a kind of Ultra-Violet Laser.

[background technology]

In the past few years we have solved the use of various interior carving optical lens in various occasions, and along with the continuous development of body laser inner carving processing, the point that need carve out is finer and smoother, clear now.Chang Yong laser wavelength lambda=532nm can not satisfy the requirement of these processing in the past.The ultraviolet light UV f θ optical lens that comes out newly developed is developed for this processing request.Because the laser of this wavelength X=355nm, it is except the amplification that can adapt to some special media absorbs, and also because of the laser of this shortwave has the resolution of littler blur circle and Geng Gao compared with 1064nm, 532nm, its principle formula is shown below:

Rayleigh disk diameter δ=2.44 λ f/D

As can be seen from the above equation, when using the optical lens of identical f/D, when using laser wavelength lambda=355nm, can make the point of Rayleigh disk thinner to 1/3-1/1.5.So no matter be cutting, line, effect can be meticulousr.The laser of this wavelength is applied in the interior carving processing, can carry out fast in the surface and the inside of handicraft, depiction accurately, the point that carves out also can be finer and smoother, clear, even, make handicraft elegant in appearance, not only improved the quality of interior carving product, but also, therefore higher working (machining) efficiency is just arranged also because the shortwave machining energy is more concentrated.The image that carves out is because its immortal characteristics have collection, appreciate and commemorate value.

The optical material of the λ=355nm that is to locate high permeability of present deficiency, these descriptions of materials are few, also brought very big difficulty to Design for optical system.

Fig. 1 is a kind of typical f θ mirror optical system, and light beam through two

galvanometers

1,2 around x axle and the rotation of y axle, focuses on the imaging surface 4 by f θ mirror 3 in turn at last, forms image by vibration mirror scanning.F θ camera lens 3 is focus lamps of a kind of flattened field, when mark, requires on imaging surface the scanning angle θ of image height η and X galvanometer 1 and Y galvanometer 2 linear, that is: η=f θ (Sr).Wherein, f is the focal length of f θ camera lens 3, and θ is the scanning angle (unit is a radian) of galvanometer.

In view of the high permeability ultraviolet optical material can be arranged, have only fused quartz and a few light flint material, and their refractive index is all very low, certainly will cause all lens radius to diminish, thereby caused aberration to be difficult for proofreading and correct, particularly senior aberration is difficult to control, though can solve this difficulty by increasing the lens number, yet can increase the volume of optical lens so again, and reduce the transmitance of light beam.For this reason, the notion that we have adopted senior aberration to compensate mutually in aberration correction, thus obtained effect preferably.

[summary of the invention]

The optical lens that the object of the invention is to provide a kind of Ultra-Violet Laser to use, being intended to solve existing camera lens influence Ultra-Violet Laser focusing, and the product that processes is meticulous inadequately, problem clearly.

The technical solution adopted in the present invention is: the optical lens that a kind of Ultra-Violet Laser is used comprises: be positioned at first, second, third lens that the incident direction of light beam is arranged in regular turn, first lens are the double concave type lens; Second lens are meniscus lens, and curved surface is towards the incident direction bending of light; The 3rd lens are lenticular lens; Wherein, to be used for focal length be that 160mm, wavelength are that Ultra-Violet Laser, the range of work of 355nm is 100*100*90mm to this optical lens ³, working depth is the 157-67mm machining area.

Wherein, the field angle of described camera lens is 50 °.

Wherein, the entrance pupil diameter of described camera lens is 12mm.

Wherein, two curved surface S1 of described first lens, S2 radius-of-curvature are respectively R1=-36mm, R2=270mm, the center thickness d1=3mm on its optical axis; Two curved surface S3 of second lens, S4 radius-of-curvature are respectively R3=-140mm, R4=-56mm, the center thickness d3=6mm on its optical axis; Two curved surface S5 of the 3rd lens, S6 radius-of-curvature are respectively R5=310mm, R6=-60mm, and the center thickness d5=12mm on its optical axis, wherein, the margin tolerance of all lens radius of curvature is 5%.

Wherein, the material of described first lens is that Nd1: Vd1 is 1.5/70, and the material of described second lens is that Nd3: Vd3 is 1.6/41, and the material of described the 3rd lens is that Nd5: Vd5 is 1.6/41, and its margin tolerance is 5%.

Wherein, described first lens and the spacing of second lens on optical axis are 4mm, and second lens and the spacing of the 3rd lens on optical axis are d4=0.1mm, and its margin tolerance is 5%.

Wherein, the 3rd lens are d6=97mm-156mm with first spacing on optical axis of being carved medium, and its margin tolerance is 5%

Carving f-θ camera lens in the Ultra-Violet Laser of the present invention, the focus point behind the aberration correction is little, has improved the encircled energy of focus point widely, and it is finer and smoother, clear, even to undercut the point that comes in making, and image is trickleer, has good stereoscopic sensation and texture.

[description of drawings]

The invention will be further described in conjunction with example with reference to the accompanying drawings:

Fig. 1 is that a kind of typical laser is used f θ lens optical system;

Fig. 2 is the optical system structure synoptic diagram of camera lens of the present invention;

Fig. 3 is the disc of confusion figure in the camera lens preferred embodiment of the present invention;

Fig. 4 is astigmatism, the curvature of field, distortion figure in the camera lens preferred embodiment of the present invention;

Fig. 5 is the figure of the optical transfer function MTF in the camera lens preferred embodiment of the present invention.

[embodiment]

Be illustrated in figure 2 as the structural representation of optical lens of the present invention, the present invention is made of three lens altogether, it is the first lens L1, the second lens L2, the 3rd lens L3 that described three lens sort successively according to the incident ray direction of light, and wherein, the first lens L1 is the double concave type lens; The second lens L2 is a meniscus lens, and curved surface is all towards the bending of light incident direction; The 3rd lens L3 is a lenticular lens.Light beam through two

galvanometers

1,2 around x axle and the rotation of y axle, is being carved on the medium by described three lens focuss in turn at last.

The concrete structure of described three lens and parameter are: the first lens L1 is that two curved surface S1, the S2 of R1, R2 constitute by radius-of-curvature respectively, and the center thickness d1 on its optical axis, material are Nd1: Vd1; The second lens L2 is that two curved surface S3, the S4 of R3, R4 constitute by radius-of-curvature respectively, and the center thickness d3 on its optical axis, material are Nd3: Vd3; The 3rd lens L3 is R5 by radius-of-curvature respectively, and two curved surface S5, the S6 of R6 constitute, and the center thickness d5 on its optical axis, material are Nd5: Vd5; The first lens L1 and the spacing of the second lens L2 on optical axis are d2, and the second lens L2 and the spacing of the 3rd lens L3 on optical axis are d4, and the 3rd lens L3 is d6 with first spacing on optical axis of being carved medium, and the thickness of being carved medium is d7.

In conjunction with above parameter, we have designed a camera lens, and its concrete data are as follows respectively:

Example:

The first lens L1 is that two curved surface S1, the S2 of R1=-36mm, R2=270mm constitute by radius-of-curvature respectively, and the center thickness d1=3mm on its optical axis, material are that Nd1: Vd1 is 1.5/70; The second lens L2 is that two curved surface S3, the S4 of R3=-140mm, R4=-56mm constitute by radius-of-curvature respectively, and the center thickness d3=6mm on its optical axis, material are Nd 3: Vd3=1.6/41; The 3rd lens L3 is R5=310mm by radius-of-curvature respectively, and two curved surface S5, the S6 of R6=-60mm constitute, and the center thickness d5=12mm on its optical axis, material are Nd5: Vd5=1.6/41; The first lens L1 and the spacing of the second lens L2 on optical axis are d2=4mm, the second lens L2 and the spacing of the 3rd lens L3 on optical axis are d4=0.1mm, the 3rd lens L3 is d6=97-156mm with first spacing on optical axis of being carved medium, and the thickness of being carved medium is d7=67mm-157mm mm.

Be listed as follows:

Curved surface S	Curvature R (mm)	Face is d (mm) at interval	Material Nd/Vd
				1	-36	3	1.5/70
2	270	4
				3	-140	6	1.6/41
4	-56	0.1
				5	310	12	1.6/41
6	-60	d6
					0	d7

Example:

f＝160mm D＝12mm 2ω＝50° A＝100*100*90mm ³

λ＝355nm d6＝97-156mm d7＝157-67mm

Wherein f is the focal length of camera lens, and D is the entrance pupil diameter,

λ is a wavelength, and 2 ω are field angle, and A is three-dimensional interior carving scope,

D6 is lens L3 and first spacing on optical axis of being carved medium,

D7 is by the thickness of engraving medium.

The parameter area of present embodiment is as follows:

1)R1-R6 ΔR _1-5≤±5％(R1-R6)

2)d1-d5 Δd _1-5≤±5％(d1-d5)

3)Nd1/Vd1-Nd5/Vd5 ΔNd _1-5/ΔVd _1-5≤±5％(Nd _1-5/Vd _1-5)

Optical lens of the present invention is used wavelength and is the Ultra-Violet Laser of 355nm, when focal distance f=160mm, can glass or quartzy in depths 157-67mm, scope be 100*100*90mm ³, can carry out plane or three-dimensional imaging mark at dielectric surface or inside, make the point that carves out finer and smoother, clear, even, indeformable, not only improve the quality of interior carving product, and also had higher work efficiency.

Fig. 3 shows that for the disc of confusion figure in the beam-expanding system preferred embodiment of the present invention image quality is very high; Fig. 4 has been corrected to optimum condition for the spherical aberration figure in the beam-expanding system preferred embodiment of the present invention; Fig. 5 shows that for the figure of the optical transfer function MTF in the beam-expanding system preferred embodiment of the present invention the resolution of this beam-expanding system is high, has reached perfect condition.

Claims

1. the optical lens that carving is used in the Ultra-Violet Laser is characterized in that, comprising: be positioned at first, second, third lens that the incident direction of light beam is arranged in regular turn, first lens are the double concave type lens; Second lens are meniscus lens, and curved surface is towards the incident direction bending of light; The 3rd lens are lenticular lens; Two curved surface S1 of described first lens, S2 radius-of-curvature are respectively R1=-36mm, R2=270mm, the center thickness d1=3mm on its optical axis; Two curved surface S3 of second lens, S4 radius-of-curvature are respectively R3=-140mm, R4=-56mm, the center thickness d3=6mm on its optical axis; Two curved surface S5 of the 3rd lens, S6 radius-of-curvature are respectively R5=310mm, R6=-60mm, and the center thickness d5=12mm on its optical axis, wherein, the margin tolerance of all lens radius of curvature is 5%; Wherein, to be used for focal length be that 160mm, wavelength are that Ultra-Violet Laser, the range of work of 355nm is 100*100*90mm to this optical lens ³, working depth is the 157-67mm machining area.

2. optical lens as claimed in claim 1 is characterized in that: the field angle of described camera lens is 50 °.

3. optical lens as claimed in claim 1 is characterized in that: the entrance pupil diameter of described camera lens is 12mm.

4. optical lens as claimed in claim 1, it is characterized in that: the material of described first lens is that Nd1:Vd1 is 1.5/70, the material of described second lens is that Nd3:Vd3 is 1.6/41, the material of described the 3rd lens is that Nd5:Vd5 is 1.6/41, wherein, the margin tolerance of Nd1:Vd1, Nd3:Vd3 and Nd5:Vd5 is 5%.

5. optical lens as claimed in claim 1 is characterized in that: described first lens and the spacing of second lens on optical axis are d2=4mm, and second lens and the spacing of the 3rd lens on optical axis are d4=0.1mm, and wherein, the margin tolerance of d2 and d4 is 5%.

6. optical lens as claimed in claim 1 is characterized in that: the 3rd lens are d6=97mm-156mm with first spacing on optical axis of being carved medium, and its margin tolerance is 5%.