CN105988194A - Projection lens - Google Patents
Projection lens Download PDFInfo
- Publication number
- CN105988194A CN105988194A CN201510050345.2A CN201510050345A CN105988194A CN 105988194 A CN105988194 A CN 105988194A CN 201510050345 A CN201510050345 A CN 201510050345A CN 105988194 A CN105988194 A CN 105988194A
- Authority
- CN
- China
- Prior art keywords
- lens
- projection
- focal length
- effective focal
- refractive power
- 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.)
- Granted
Links
Landscapes
- Lenses (AREA)
Abstract
A projection lens sequentially comprises a first lens group with positive refractive power and a second lens group with positive refractive power along an optical axis from a projection side to an image source side. The second lens group sequentially comprises a third lens with negative refractive power, a fourth lens with positive refractive power, a fifth lens with positive refractive power and a sixth lens with positive refractive power along the optical axis from the projection side to the image source side. The third lens and the fourth lens are glued into a doublet lens which has negative refractive power. The third lens meets the following condition: -0.579<=f3/f<=-0.4, wherein f3 is the effective focal length of the third lens, and f is the effective focal length of the projection lens.
Description
Technical field
The present invention is related to a kind of projection lens.
Background technology
The volume of conventional projectors is relatively big, is not easy to carry, and scialyscope carries for convenience in recent years, by
Gradually move towards Miniaturization Design so that the projection lens used in it also needs and then miniaturization.Additionally, in order to
Promoting the brightness of scialyscope, projection lens need to possess relatively large aperture.On the other hand, in order to short projection away from
From projecting large-size picture, projection lens need to possess bigger projection ratio.So traditional projection lens
Head cannot meet the projection lens demand of miniaturization projecting camera, it is desirable to have a kind of new projection lens has simultaneously
Standby miniaturization, large aperture and bigger projection ratio, could meet the demand of miniaturization projecting camera.
Summary of the invention
The technical problem to be solved in the present invention is, can not be provided simultaneously with for projection lens of the prior art
The defect of miniaturization, large aperture and bigger projection ratio, it is provided that a kind of projection lens, possesses miniaturization, big light
Enclose and bigger projection ratio, but still there is good optical property and resolution.
The present invention solves that its technical problem be employed technical scheme comprise that, it is provided that a kind of projection lens is along light
Axle sequentially includes first lens group with positive refractive power from projection side to image source and has positive refractive power
The second lens group.Second lens group sequentially includes having negative dioptric along optical axis from projection side to image source
3rd lens of power, there are the 4th lens of positive refractive power, there are the 5th lens of positive refractive power and just have
6th lens of refractive power.3rd lens and the 4th lens glue synthesis balsaming lens, this balsaming lens has negative
Refractive power.3rd lens meet following condition :-0.579≤f3/ f≤-0.4, wherein f3It is having of the 3rd lens
Effect focal length, f is the effective focal length of projection lens.
Wherein the first lens group sequentially includes first lens and second from projection side to image source along optical axis
Lens, the first lens have negative refractive power, and the second lens have positive refractive power.
Wherein projection lens meets following condition: 0.0094≤BFL/TTL≤0.118；
IMGH/TTL≤0.148；0.268≤f/TTL≤0.31；Wherein, BFL be the image side surface of the 6th lens extremely
One image comes from the distance on optical axis, TTL be thing side to the image of the first lens come from optical axis away from
From, IMGH is the image height of projection lens, and f is the effective focal length of projection lens.
Wherein the first lens meet following condition :-8≤f1/f≤-3.444；Wherein, f1It is having of the first lens
Effect focal length, f is the effective focal length of projection lens.
Wherein the second lens meet following condition: 2.093≤f2/f≤2.988；Wherein, f2It is the second lens
Effective focal length, f is the effective focal length of projection lens.
Wherein each lens at least one side of the first lens, the second lens, the 5th lens and the 6th lens is non-
Spherical face or two faces are all non-spherical surface.
Wherein the first lens, the 5th lens and the 6th lens are made up of plastic material.
Wherein the 3rd lens and the 4th lens meet following condition: 0.849≤f4/f≤1.1365；
-2.7≤f34/f≤-1.4；Wherein, f4It is the effective focal length of the 4th lens, f34It is the 3rd lens and the 4th saturating
The combination effective focal length of mirror, f is the effective focal length of projection lens.
Wherein the 5th lens meet following condition: 0.33≤f5/f≤1.255；Wherein, f5It is the 5th lens
Effective focal length, f is the effective focal length of projection lens.
Wherein the 6th lens meet following condition: 2.07≤f6/f≤2.78；Wherein, f6It is having of the 6th lens
Effect focal length, f is the effective focal length of projection lens.
Wherein the 3rd lens are made up of glass material.
The projection lens of the present invention can further include aperture, is arranged between the first lens group and the second lens group.
Implement the projection lens of the present invention, have the advantages that possess miniaturization, large aperture with bigger
Projection ratio, but still there is good optical property and resolution.
Accompanying drawing explanation
For making the above-mentioned purpose of the present invention, feature and advantage to become apparent, preferable enforcement cited below particularly
Example also coordinates accompanying drawing to elaborate.
Fig. 1 is based on lens configuration and the light path schematic diagram of the first embodiment of the projection lens of the present invention.
Fig. 2 A is the curvature of field figure of the projection lens of Fig. 1.
Fig. 2 B is the distortion figure of the projection lens of Fig. 1.
Fig. 2 C is the lateral chromatic aberration figure of the projection lens of Fig. 1.
Fig. 2 D is the modulation transfer function figure of the projection lens of Fig. 1.
Fig. 3 is based on lens configuration and the light path schematic diagram of the second embodiment of the projection lens of the present invention.
Fig. 4 A is the curvature of field figure of the projection lens of Fig. 3.
Fig. 4 B is the distortion figure of the projection lens of Fig. 3.
Fig. 4 C is the lateral chromatic aberration figure of the projection lens of Fig. 3.
Fig. 4 D is the modulation transfer function figure of the projection lens of Fig. 3.
Fig. 5 is based on lens configuration and the light path schematic diagram of the 3rd embodiment of the projection lens of the present invention.
Fig. 6 A is the curvature of field figure of the projection lens of Fig. 5.
Fig. 6 B is the distortion figure of the projection lens of Fig. 5.
Fig. 6 C is the lateral chromatic aberration figure of the projection lens of Fig. 5.
Fig. 6 D is the modulation transfer function figure of the projection lens of Fig. 5.
Fig. 7 is based on lens configuration and the light path schematic diagram of the 4th embodiment of the projection lens of the present invention.
Fig. 8 A is the curvature of field figure of the projection lens of Fig. 7.
Fig. 8 B is the distortion figure of the projection lens of Fig. 7.
Fig. 8 C is the lateral chromatic aberration figure of the projection lens of Fig. 7.
Fig. 8 D is the modulation transfer function figure of the projection lens of Fig. 7.
Detailed description of the invention
Refer to Fig. 1, Fig. 1 and be based on the lens configuration of first embodiment of projection lens and the light of the present invention
Road schematic diagram.During projection, the light from image source IS1 is finally projected on projection side.Projection lens 1
The first lens group G11, aperture ST1 and second is sequentially included from projection side to image source along optical axis OA1
Lens group G12.First lens group G11 has positive refractive power, the first lens group G11 along optical axis OA1 from
Projection side to image source sequentially includes the first lens L11 and the second lens L12.First lens L11 is convex
Concavees lens have negative refractive power and are made up of plastic material, and its projection side S11 is convex surface, image source side
S12 is concave surface, and projection side S11 and image source side S12 is all non-spherical surface.Second lens L12
Having positive refractive power for convexoconcave lens to be made up of glass material, its projection side S13 is convex surface, image source
Face S14 is concave surface, and projection side S13 and image source side S14 is all non-spherical surface.Second lens group
G12 has positive refractive power, and the second lens group G12 sequentially wraps to image source along optical axis OA1 from projection side
Include the 3rd lens L13, the 4th lens L14, the 5th lens L15 and the 6th lens L16.3rd lens L13
Having negative refractive power for planoconcave lens to be made up of glass material, its projection side S16 is concave surface and is sphere table
Face.4th lens L14 is that planoconvex lens has positive refractive power and is made up of glass material, its image source side
S18 is convex surface and is spherical face.3rd lens L13 and the 4th lens L14 composes balsaming lens, this
Balsaming lens has negative refractive power.5th lens L15 is that biconvex lens has positive refractive power by plastic material system
Becoming, its projection side S19 and image source side S110 is all non-spherical surface.6th lens L16 is double
Convex lens has positive refractive power and is made up of plastic material, its projection side S111 and image source side S112
It is all non-spherical surface.
Prism P1 is arranged between the second lens group G12 and image source IS1, and plate glass CG1 is arranged at
Between prism P1 and image source IS1.Face S113, face S114, face S115 and face S116 are all plane.
It addition, for making the projection lens of the present invention can keep good optical property, the throwing in first embodiment
Shadow camera lens 1 need to meet beneath ten conditions:
-0.579≤f13/f1≤-0.4 (1)
0.0094≤BFL1/TTL1≤0.118 (2)
IMGH1/TTL1≤0.148 (3)
0.268≤f1/TTL1≤0.31 (4)
-8≤f11/f1≤-3.444 (5)
2.093≤f12/f1≤2.988 (6)
0.849≤f14/f1≤1.1365 (7)
-2.7≤f134/f1≤-1.4 (8)
0.33≤f15/f1≤1.255 (9)
2.07≤f16/f1≤2.78 (10)
Wherein, f13Being the effective focal length of the 3rd lens L13, f1 is the effective focal length of projection lens 1, BFL1
Being the image side surface S112 to image source IS1 of the 6th lens L16 distance on optical axis OA1, TTL1 is
The thing side S11 to image source IS1 of one lens L11 distance on optical axis OA1, IMGH1 is projection lens
The image height of 1, f11It is the effective focal length of the first lens L11, f12It is the effective focal length of the second lens L12,
f14It is the effective focal length of the 4th lens L14, f134It is that the combination of the 3rd lens L13 and the 4th lens L14 has
Effect focal length, f15It is the effective focal length of the 5th lens L15, f16It it is the effective focal length of the 6th lens L16.
Utilize the design of said lens and aperture ST1 so that projection lens 1 can effectively shorten camera lens overall length
Degree, stop down value, increase projection ratio, effectively revise aberration, promote resolution of lens.
Table one is the relevant parameter table of each lens of projection lens 1 in Fig. 1, and table one data show that first implements
The effective focal length of the projection lens 1 of example equal to 11.4mm, f-number equal to 1.85, projection than equal to 1.65,
Camera lens total length is equal to 36.8124mm.
Table one
Obtained by table one, the non-spherical surface depression degree z of each lens is by following equation:
Z=ch2/{1+[1-(k+1)c2h2]1/2}+Ah4+Bh6+Ch8+Dh10+Eh12
Wherein:
C: curvature；
H: the vertical dimension of lens surface any point to optical axis；
K: circular cone coefficient；
A～E: asphericity coefficient.
Table two is the relevant parameter table of the non-spherical surface of each lens in table one, and wherein k is circular cone coefficient
(Conic Constant), A～E are asphericity coefficient.
Table two
Effective focal length f1 of its 3rd lens L13 of projection lens 1 of first embodiment3=-4.552mm, throws
Effective focal length f1=11.4mm of shadow camera lens 1, the image side surface S112 of the 6th lens L16 to image source IS1
Distance BFL1=0.4mm on optical axis OA1, the thing side S11 to image source IS1 of the first lens L11
Distance TTL1=36.8124mm on optical axis OA1, the image height IMGH1=5.45mm of projection lens 1,
Effective focal length f1 of the first lens L111=-91.104mm, effective focal length f1 of the second lens L122=23.862
Mm, effective focal length f1 of the 4th lens L144=9.67mm, the 3rd lens L13's and the 4th lens L14
Combination effective focal length f134=-16mm, effective focal length f1 of the 5th lens L155=13.678mm, the 6th is saturating
Effective focal length f1 of mirror L166=26.972mm, be can get f1 by above-mentioned data3/ f1=-0.4,
BFL1/TTL1=0.0109, IMGH1/TTL1=0.148, f1/TTL1=0.31, f11/ f1=-8,
f12/ f1=2.093, f14/ f1=0.849, f134/ f1=-1.4, f15/ f1=1.2, f16/ f1=2.366 all can
Meet above-mentioned condition (1) to the requirement of condition (10).
It addition, the optical property of the projection lens 1 of first embodiment also can reach requirement, this can be from Fig. 2 A
Find out to Fig. 2 D.Shown in Fig. 2 A, it is the curvature of field (Field of the projection lens 1 of first embodiment
Curvature) figure.Shown in Fig. 2 B, it it is the distortion (Distortion) of the projection lens 1 of first embodiment
Figure.Shown in Fig. 2 C, it it is the lateral chromatic aberration (Lateral Color) of the projection lens 1 of first embodiment
Figure.Shown in Fig. 2 D, it is the modulation transfer function (Modulation of the projection lens 1 of first embodiment
Transfer Function) figure.
Be can be seen that by Fig. 2 A, the projection lens 1 of first embodiment is 0.465 μm, 0.550 μ to wavelength
M, the light of 0.625 μm, in meridian (Tangential) direction and the sagitta of arc (Sagittal) the direction curvature of field
Between-0.04 to 0.06.Be can be seen that by Fig. 2 B, the projection lens 1 of first embodiment is right
Wavelength be 0.465 μm, 0.550 μm, 0.625 μm the produced distortion of light between-1.4% to
Between 0.6%.Be can be seen that by Fig. 2 C, the projection lens 1 of first embodiment to wavelength be 0.465 μm,
0.550 μm, 0.625 μm light in lateral chromatism difference produced by different field height between 0.0 μ
Between m to 3.5 μm.Be can be seen that by Fig. 2 D, wave-length coverage is situated between by the projection lens 1 of first embodiment
In the light of 0.465 μm to 0.625 μm, respectively at meridian (Tangential) direction and the sagitta of arc
(Sagittal) direction, field height is respectively 0.0000mm ,-3.7800mm ,-5.4500mm, empty
Between frequency between 0lp/mm to 92.6lp/mm, its modulation transfer function value is between 0.50 to 1.0.
The curvature of field of projection lens 1 of obvious first embodiment, distortion, lateral chromatic aberration can effectively be revised, camera lens
Resolution also can meet requirement, thus obtains preferably optical property.
Refer to Fig. 3, Fig. 3 and be based on the lens configuration of the second embodiment of projection lens and the light of the present invention
Road schematic diagram.During projection, the light from image source IS2 is finally projected on projection side.Projection lens 2
The first lens group G21, aperture ST2 and second is sequentially included from projection side to image source along optical axis OA2
Lens group G22.First lens group G21 has positive refractive power, the first lens group G21 along optical axis OA2 from
Projection side to image source sequentially includes the first lens L21 and the second lens L22.First lens L21 is convex
Concavees lens have negative refractive power and are made up of plastic material, and its projection side S21 is convex surface, image source side
S22 is concave surface, and projection side S21 and image source side S22 is all non-spherical surface.Second lens L22
Having positive refractive power for convexoconcave lens to be made up of glass material, its projection side S23 is convex surface, image source
Face S24 is concave surface, and projection side S23 and image source side S24 is all non-spherical surface.Second lens group
G22 has positive refractive power, and the second lens group G22 sequentially wraps to image source along optical axis OA2 from projection side
Include the 3rd lens L23, the 4th lens L24, the 5th lens L25 and the 6th lens L26.3rd lens L23
Having negative refractive power for biconcave lens to be made up of glass material, its projection side S26 is spherical face.4th
Lens L24 is that biconvex lens has positive refractive power and is made up of glass material, and its image source side S28 is sphere
Surface.3rd lens L23 and the 4th lens L24 composes balsaming lens, and this balsaming lens has negative dioptric
Power.5th lens L25 is that biconvex lens has positive refractive power and is made up of plastic material, and it projects side S29
It is all non-spherical surface with image source side S210.6th lens L26 is that biconvex lens has positive refractive power
Being made up of plastic material, its projection side S211 and image source side S212 is all non-spherical surface.
Prism P2 is arranged between the second lens group G22 and image source IS2, and plate glass CG2 is arranged at
Between prism P2 and image source IS2.Face S213, face S214, face S215 and face S216 are all plane.
It addition, for making the projection lens of the present invention can keep good optical property, the throwing in the second embodiment
Shadow camera lens 2 need to meet beneath ten conditions:
-0.579≤f23/f2≤-0.4 (11)
0.0094≤BFL2/TTL2≤0.118 (12)
IMGH2/TTL2≤0.148 (13)
0.268≤f2/TTL2≤0.31 (14)
-8≤f21/f2≤-3.444 (15)
2.093≤f22/f2≤2.988 (16)
0.849≤f24/f2≤1.1365 (17)
-2.7≤f234/f2≤-1.4 (18)
0.33≤f25/f2≤1.255 (19)
2.07≤f26/f2≤2.78 (20)
Wherein, f23Being the effective focal length of the 3rd lens L23, f2 is the effective focal length of projection lens 2, BFL2
Being the image side surface S212 to image source IS2 of the 6th lens L26 distance on optical axis OA2, TTL2 is
The thing side S21 to image source IS2 of one lens L21 distance on optical axis OA2, IMGH2 is projection lens
The image height of 2, f21It is the effective focal length of the first lens L21, f22It is the effective focal length of the second lens L22,
f24It is the effective focal length of the 4th lens L24, f234It is that the combination of the 3rd lens L23 and the 4th lens L24 has
Effect focal length, f25It is the effective focal length of the 5th lens L25, f26It it is the effective focal length of the 6th lens L26.
Utilize the design of said lens and aperture ST2 so that projection lens 2 can effectively shorten camera lens overall length
Degree, stop down value, increase projection ratio, effectively revise aberration, promote resolution of lens.
Table three is the relevant parameter table of each lens of projection lens 2 in Fig. 3, and table three data show that second implements
The effective focal length of the projection lens 2 of example equal to 11.4mm, f-number equal to 1.65, projection than equal to 1.65,
Camera lens total length is equal to 40.8706mm.
Table three
Obtained by table three, the non-spherical surface depression degree z of each lens is by following equation:
Z=ch2/{1+[1-(k+1)c2h2]1/2}+Ah4+Bh6+Ch8+Dh10+Eh12
Wherein:
C: curvature；
H: the vertical dimension of lens surface any point to optical axis；
K: circular cone coefficient；
A～E: asphericity coefficient.
Table four is the relevant parameter table of the non-spherical surface of each lens in table three, and wherein k is circular cone coefficient
(Conic Constant), A～E are asphericity coefficient.
Table four
Effective focal length f2 of its 3rd lens L23 of projection lens 2 of the second embodiment3=-5.717mm, throws
Effective focal length f2=11.4mm of shadow camera lens 2, the image side surface S212 of the 6th lens L26 to image source IS2
Distance BFL2=0.4mm on optical axis OA2, the thing side S21 to image source IS2 of the first lens L21
Distance TTL2=40.8706mm on optical axis OA2, the image height IMGH2=5.45mm of projection lens 2,
Effective focal length f2 of the first lens L211=-51.384mm, effective focal length f2 of the second lens L222=30.29
Mm, effective focal length f2 of the 4th lens L244=10.488mm, the 3rd lens L23 and the 4th lens L24
Combination effective focal length f234=-25.644mm, effective focal length f2 of the 5th lens L255=14.021mm,
Effective focal length f2 of the 6th lens L266=31.39mm, be can get f2 by above-mentioned data3/ f2=-0.515,
BFL2/TTL2=0.00979, IMGH2/TTL2=0.1333, f2/TTL2=0.279, f21/ f2=-4.507,
f22/ f2=2.657, f24/ f2=0.92, f234/ f2=-2.25, f25/ f2=1.23, f26/ f2=2.754 is all
Above-mentioned condition (11) can be met to the requirement of condition (20).
It addition, the optical property of the projection lens 2 of the second embodiment also can reach requirement, this can be from Fig. 4 A
Find out to Fig. 4 D.Shown in Fig. 4 A, it is the curvature of field (Field of the projection lens 2 of the second embodiment
Curvature) figure.Shown in Fig. 4 B, it it is the distortion (Distortion) of the projection lens 2 of the second embodiment
Figure.Shown in Fig. 4 C, it it is the lateral chromatic aberration (Lateral Color) of the projection lens 2 of the second embodiment
Figure.Shown in Fig. 4 D, it is the modulation transfer function (Modulation of the projection lens 2 of the second embodiment
Transfer Function) figure.
Be can be seen that by Fig. 4 A, the projection lens 2 of the second embodiment is 0.465 μm, 0.550 μ to wavelength
M, the light of 0.625 μm, in meridian (Tangential) direction and the sagitta of arc (Sagittal) the direction curvature of field
Between-0.04 to 0.06.By Fig. 4 B, (three lines in figure almost overlap, so that having seen
Carry out only one line) can be seen that, the projection lens 2 of the second embodiment to wavelength be 0.465 μm, 0.550
μm, 0.625 μm the produced distortion of light between-1.2% to 1.2%.Be can be seen that by Fig. 4 C,
The projection lens 2 of the second embodiment is 0.465 μm, 0.550 μm, the light of 0.625 μm to wavelength
In lateral chromatism difference produced by different field height between 0.0 μm to 3.5 μm.By Fig. 4 D
Can be seen that, the projection lens 2 of the second embodiment to wave-length coverage between 0.465 μm to 0.625 μm
Light, respectively at meridian (Tangential) direction and the sagitta of arc (Sagittal) direction, field height is respectively
For 0.0000mm ,-3.7800mm ,-5.4500mm, spatial frequency between 0lp/mm to 92.6lp/mm,
Its modulation transfer function value is between 0.46 to 1.0.The field of the projection lens 2 of obvious second embodiment
Song, distortion, lateral chromatic aberration can effectively be revised, and resolution of lens also can meet requirement, thus obtains relatively
Good optical property.
Refer to Fig. 5, Fig. 5 and be based on the lens configuration of the 3rd embodiment of projection lens and the light of the present invention
Road schematic diagram.During projection, the light from image source IS3 is finally projected on projection side.Projection lens 3
The first lens group G31, aperture ST3 and second is sequentially included from projection side to image source along optical axis OA3
Lens group G32.First lens group G31 has positive refractive power, the first lens group G31 along optical axis OA3 from
Projection side to image source sequentially includes the first lens L31 and the second lens L32.First lens L31 is convex
Concavees lens have negative refractive power and are made up of plastic material, and its projection side S31 is convex surface, image source side
S32 is concave surface, and projection side S31 and image source side S32 is all non-spherical surface.Second lens L32
Having positive refractive power for convexoconcave lens to be made up of plastic material, its projection side S33 is convex surface, image source
Face S34 is concave surface, and projection side S33 and image source side S34 is all non-spherical surface.Second lens group
G32 has positive refractive power, and the second lens group G32 sequentially wraps to image source along optical axis OA3 from projection side
Include the 3rd lens L33, the 4th lens L34, the 5th lens L35 and the 6th lens L36.3rd lens L33
Having negative refractive power for biconcave lens to be made up of glass material, its projection side S36 is concave surface and is sphere table
Face.4th lens L34 is that biconvex lens has positive refractive power and is made up of glass material, its image source side
S38 is convex surface and is spherical face.3rd lens L33 and the 4th lens L34 composes balsaming lens, this
Balsaming lens has negative refractive power.5th lens L35 is that biconvex lens has positive refractive power by plastic material system
Becoming, its projection side S39 and image source side S310 is all non-spherical surface.6th lens L36 is convex
Concavees lens have positive refractive power and are made up of plastic material, and its projection side S311 is convex surface, image source side
S312 is concave surface, and projection side S311 and image source side S312 is all non-spherical surface.
Prism P3 is arranged between the second lens group G32 and image source IS3, and plate glass CG3 is arranged at
Between prism P3 and image source IS3.Face S313, face S314, face S315 and face S316 are all plane.
It addition, for making the projection lens of the present invention can keep good optical property, the throwing in the 3rd embodiment
Shadow camera lens 3 need to meet beneath ten conditions:
-0.579≤f33/f3≤-0.4 (21)
0.0094≤BFL3/TTL3≤0.118 (22)
IMGH3/TTL3≤0.148 (23)
0.268≤f3/TTL3≤0.31 (24)
-8≤f31/f3≤-3.444 (25)
2.093≤f32/f3≤2.988 (26)
0.849≤f34/f3≤1.1365 (27)
-2.7≤f334/f3≤-1.4 (28)
0.33≤f35/f3≤1.255 (29)
2.07≤f36/f3≤2.78 (30)
Wherein, f33Being the effective focal length of the 3rd lens L33, f3 is the effective focal length of projection lens 3, BFL3
Being the image side surface S312 to image source IS3 of the 6th lens L36 distance on optical axis OA3, TTL3 is
The thing side S31 to image source IS3 of one lens L31 distance on optical axis OA3, IMGH3 is projection lens
The image height of 3, f31It is the effective focal length of the first lens L31, f32It is the effective focal length of the second lens L32,
f34It is the effective focal length of the 4th lens L34, f334It is that the combination of the 3rd lens L33 and the 4th lens L34 has
Effect focal length, f35It is the effective focal length of the 5th lens L35, f36It it is the effective focal length of the 6th lens L36.
Utilize the design of said lens and aperture ST3 so that projection lens 3 can effectively shorten camera lens overall length
Degree, stop down value, increase projection ratio, effectively revise aberration, promote resolution of lens.
Table five is the relevant parameter table of each lens of projection lens 3 in Fig. 5, and table five data show that the 3rd implements
The effective focal length of the projection lens 3 of example equal to 11.4mm, f-number equal to 1.55, projection than equal to 1.65,
Camera lens total length is equal to 42.5339mm.
Table five
Obtained by table five, the non-spherical surface depression degree z of each lens is by following equation:
Z=ch2/{1+[1-(k+1)c2h2]1/2}+Ah4+Bh6+Ch8+Dh10+Eh12
Wherein:
C: curvature；
H: the vertical dimension of lens surface any point to optical axis；
K: circular cone coefficient；
A～E: asphericity coefficient.
Table six is the relevant parameter table of the non-spherical surface of each lens in table five, and wherein k is circular cone coefficient
(Conic Constant), A～E are asphericity coefficient.
Table six
Effective focal length f3 of its 3rd lens L33 of projection lens 3 of the 3rd embodiment3=-6.5977mm, throws
Effective focal length f3=11.4mm of shadow camera lens 3, the image side surface S312 of the 6th lens L36 to image source IS3
Distance BFL3=0.5mm on optical axis OA3, the thing side S31 to image source IS3 of the first lens L31
Distance TTL3=42.5339mm on optical axis OA3, the image height IMGH3=5.45mm of projection lens 3,
Effective focal length f3 of the first lens L311=-62.015mm, the effective focal length of the second lens L32
f32=34.0668mm, effective focal length f3 of the 4th lens L344=12.9565mm, the 3rd lens L33 and
Combination effective focal length f3 of the 4th lens L3434=-22.246mm, the effective focal length of the 5th lens L35
f35=3.766mm, effective focal length f3 of the 6th lens L366=23.63mm, be can get by above-mentioned data
f33/ f3=-0.579, BFL3/TTL3=0.0118, IMGH3/TTL3=0.129, f3/TTL3=0.269,
f31/ f3=-5.44, f32/ f3=2.988, f34/ f3=1.1365, f334/ f3=-1.951, f35/ f3=0.33,
f36/ f3=2.07 all can meet above-mentioned condition (21) to the requirement of condition (30).
It addition, the optical property of the projection lens 3 of the 3rd embodiment also can reach requirement, this can be from Fig. 6 A
Find out to Fig. 6 D.Shown in Fig. 6 A, it is the curvature of field (Field of the projection lens 3 of the 3rd embodiment
Curvature) figure.Shown in Fig. 6 B, it it is the distortion (Distortion) of the projection lens 3 of the 3rd embodiment
Figure.Shown in Fig. 6 C, it it is the lateral chromatic aberration (Lateral Color) of the projection lens 3 of the 3rd embodiment
Figure.Shown in Fig. 6 D, it is the modulation transfer function (Modulation of the projection lens 3 of the 3rd embodiment
Transfer Function) figure.
Be can be seen that by Fig. 6 A, the projection lens 3 of the 3rd embodiment is 0.465 μm, 0.550 μ to wavelength
M, the light of 0.625 μm, in meridian (Tangential) direction and the sagitta of arc (Sagittal) the direction curvature of field
Between-0.07 to 0.07.Be can be seen that by Fig. 6 B, the projection lens 3 of the 3rd embodiment is right
Wavelength be 0.465 μm, 0.550 μm, 0.625 μm the produced distortion of light between 0.0% to
Between 1.9%.Be can be seen that by Fig. 6 C, the projection lens 3 of the 3rd embodiment to wavelength be 0.465 μm,
0.550 μm, 0.625 μm light in lateral chromatism difference produced by different field height between 0.0 μ
Between m to 3.5 μm.Be can be seen that by Fig. 6 D, wave-length coverage is situated between by the projection lens 3 of the 3rd embodiment
In the light of 0.465 μm to 0.625 μm, respectively at meridian (Tangential) direction and the sagitta of arc
(Sagittal) direction, field height is respectively 0.0000mm ,-3.7800mm ,-5.4500mm, empty
Between frequency between 0lp/mm to 92.6lp/mm, its modulation transfer function value is between 0.47 to 1.0.
The curvature of field of projection lens 3 of obvious 3rd embodiment, distortion, lateral chromatic aberration can effectively be revised, camera lens
Resolution also can meet requirement, thus obtains preferably optical property.
Refer to Fig. 7, Fig. 7 and be based on the lens configuration of the 4th embodiment of projection lens and the light of the present invention
Road schematic diagram.During projection, the light from image source IS4 is finally projected on projection side.Projection lens 4
The first lens group G41, aperture ST4 and second is sequentially included from projection side to image source along optical axis OA4
Lens group G42.First lens group G41 has positive refractive power, the first lens group G41 along optical axis OA4 from
Projection side to image source sequentially includes the first lens L41 and the second lens L42.First lens L41 is convex
Concavees lens have negative refractive power and are made up of plastic material, and its projection side S41 is convex surface, image source side
S42 is concave surface, and projection side S41 and image source side S42 is all non-spherical surface.Second lens L42
Having positive refractive power for convexoconcave lens to be made up of glass material, its projection side S43 is convex surface, image source
Face S44 is concave surface, and projection side S43 and image source side S44 is all non-spherical surface.Second lens group
G42 has positive refractive power, and the second lens group G42 sequentially wraps to image source along optical axis OA4 from projection side
Include the 3rd lens L43, the 4th lens L44, the 5th lens L45 and the 6th lens L46.3rd lens L43
Having negative refractive power for biconcave lens to be made up of glass material, its projection side S46 is concave surface and is sphere table
Face.4th lens L44 is that biconvex lens has positive refractive power and is made up of glass material, its image source side
S48 is convex surface and is spherical face.3rd lens L43 and the 4th lens L44 composes balsaming lens, this
Balsaming lens has negative refractive power.5th lens L45 is that biconvex lens has positive refractive power by plastic material system
Becoming, its projection side S49 and image source side S410 is all non-spherical surface.6th lens L46 is convex
Concavees lens have positive refractive power and are made up of plastic material, and its projection side S411 is convex surface, image source side
S412 is concave surface, and projection side S411 and image source side S412 is all non-spherical surface.
Prism P4 is arranged between the second lens group G42 and image source IS4, and plate glass CG4 is arranged at
Between prism P4 and image source IS4.Face S413, face S414, face S415 and face S416 are all plane.
It addition, for making the projection lens of the present invention can keep good optical property, the throwing in the 4th embodiment
Shadow camera lens 4 need to meet beneath ten conditions:
-0.579≤f43/f4≤-0.4 (31)
0.0094≤BFL4/TTL4≤0.118 (32)
IMGH4/TTL4≤0.148 (33)
0.268≤f4/TTL4≤0.31 (34)
-8≤f41/f4≤-3.444 (35)
2.093≤f42/f4≤2.988 (36)
0.849≤f44/f4≤1.1365 (37)
-2.7≤f434/f4≤-1.4 (38)
0.33≤f45/f4≤1.255 (39)
2.07≤f46/f4≤2.78 (40)
Wherein, f43Being the effective focal length of the 3rd lens L43, f4 is the effective focal length of projection lens 4, BFL4
Being the image side surface S412 to image source IS4 of the 6th lens L46 distance on optical axis OA4, TTL4 is
The thing side S41 to image source IS4 of one lens L41 distance on optical axis OA4, IMGH4 is projection lens
The image height of 4, f41It is the effective focal length of the first lens L41, f42It is the effective focal length of the second lens L42,
f44It is the effective focal length of the 4th lens L44, f434It is that the combination of the 3rd lens L43 and the 4th lens L44 has
Effect focal length, f45It is the effective focal length of the 5th lens L45, f46It it is the effective focal length of the 6th lens L46.
Utilize the design of said lens and aperture ST4 so that projection lens 4 can effectively shorten camera lens overall length
Degree, stop down value, increase projection ratio, effectively revise aberration, promote resolution of lens.
Table seven is the relevant parameter table of each lens of projection lens 4 in Fig. 7, and table seven data show that the 4th implements
The effective focal length of the projection lens 4 of example equal to 11.4mm, f-number equal to 1.55, projection than equal to 1.65,
Camera lens total length is equal to 42.542mm.
Table seven
Obtained by table seven, the non-spherical surface depression degree z of each lens is by following equation:
Z=ch2/{1+[1-(k+1)c2h2]1/2}+Ah4+Bh6+Ch8+Dh10+Eh12
Wherein:
C: curvature；
H: the vertical dimension of lens surface any point to optical axis；
K: circular cone coefficient；
A～E: asphericity coefficient.
Table eight is the relevant parameter table of the non-spherical surface of each lens in table seven, and wherein k is circular cone coefficient
(Conic Constant), A～E are asphericity coefficient.
Table eight
Effective focal length f4 of its 3rd lens L43 of projection lens 4 of the 4th embodiment3=-6.248mm, throws
Effective focal length f4=11.4mm of shadow camera lens 4, the image side surface S412 of the 6th lens L46 to image source IS4
Distance BFL4=0.4mm on optical axis OA4, the thing side S41 to image source IS4 of the first lens L41
Distance TTL4=42.542mm on optical axis OA4, the image height IMGH4=5.45mm of projection lens 4, the
Effective focal length f4 of one lens L411=-39.263mm, effective focal length f4 of the second lens L422=28.956
Mm, effective focal length f4 of the 4th lens L444=10.593mm, the 3rd lens L43 and the 4th lens L44
Combination effective focal length f434=-30.812mm, effective focal length f4 of the 5th lens L455=14.3116mm,
Effective focal length f4 of the 6th lens L466=31.69mm, be can get f4 by above-mentioned data3/ f4=-0.548,
BFL4/TTL4=0.0094, IMGH4/TTL4=0.128, f4/TTL4=0.268, f41/ f4=-3.444,
f42/ f4=2.54, f44/ f4=0.93, f434/ f4=-2.7, f45/ f4=1.255, f46/ f4=2.78 all can
Meet above-mentioned condition (31) to the requirement of condition (40).
It addition, the optical property of the projection lens 4 of the 4th embodiment also can reach requirement, this can be from Fig. 8 A
Find out to Fig. 8 D.Shown in Fig. 8 A, it is the curvature of field (Field of the projection lens 4 of the 4th embodiment
Curvature) figure.Shown in Fig. 8 B, it it is the distortion (Distortion) of the projection lens 4 of the 4th embodiment
Figure.Shown in Fig. 8 C, it it is the lateral chromatic aberration (Lateral Color) of the projection lens 4 of the 4th embodiment
Figure.Shown in Fig. 8 D, it is the modulation transfer function (Modulation of the projection lens 4 of the 4th embodiment
Transfer Function) figure.
Be can be seen that by Fig. 8 A, the projection lens 4 of the 4th embodiment is 0.465 μm, 0.550 μ to wavelength
M, the light of 0.625 μm, in meridian (Tangential) direction and the sagitta of arc (Sagittal) the direction curvature of field
Between-0.04 to 0.05.Be can be seen that by Fig. 8 B, the projection lens 4 of the 4th embodiment is right
Wavelength be 0.465 μm, 0.550 μm, 0.625 μm the produced distortion of light between-0.6% to
Between 1.3%.Be can be seen that by Fig. 8 C, the projection lens 4 of the 4th embodiment to wavelength be 0.465 μm,
0.550 μm, 0.625 μm light in lateral chromatism difference produced by different field height between-0.5 μ
Between m to 3.5 μm.Be can be seen that by Fig. 8 D, wave-length coverage is situated between by the projection lens 4 of the 4th embodiment
In the light of 0.465 μm to 0.625 μm, respectively at meridian (Tangential) direction and the sagitta of arc
(Sagittal) direction, field height is respectively 0.0000mm ,-3.7800mm ,-5.4500mm, empty
Between frequency between 0lp/mm to 92.5lp/mm, its modulation transfer function value is between 0.51 to 1.0.
The curvature of field of projection lens 4 of obvious 4th embodiment, distortion, lateral chromatic aberration can effectively be revised, camera lens
Resolution also can meet requirement, thus obtains preferably optical property.
Although the present invention is disclosed above with preferred embodiment, but it is not limited to the present invention, this area
Technical staff, without departing from the spirit and scope of the present invention, still can make a little change and retouching, because of
This protection scope of the present invention is when being as the criterion depending on as defined in claim.
Claims (12)
1. a projection lens, it is characterised in that sequentially include to image source from projection side along optical axis:
First lens group, this first lens group has positive refractive power；And
Second lens group, this second lens group has positive refractive power, this second lens group along this optical axis from this
Projection side sequentially includes the 3rd lens, the 4th lens, the 5th lens and the 6th lens to this image source,
3rd lens have negative refractive power, and the 4th lens have positive refractive power, and the 5th lens have positive dioptric
Power, the 6th lens have positive refractive power；
Wherein the 3rd lens and the 4th lens glue synthesis balsaming lens, this balsaming lens has negative dioptric
Power；
Wherein the 3rd lens meet following condition:
-0.579≤f3/f≤-0.4
Wherein, f3For the effective focal length of the 3rd lens, f is the effective focal length of this projection lens.
2. projection lens as claimed in claim 1, it is characterised in that this first lens group is along this light
Axle sequentially includes the first lens and the second lens from this projection side to this image source, and these first lens have
Negative refractive power, these second lens have positive refractive power.
3. projection lens as claimed in claim 2, it is characterised in that this projection lens meets following bar
Part:
0.0094≤BFL/TTL≤0.118
IMGH/TTL≤0.148
0.268≤f/TTL≤0.31
Wherein, BFL is that image side surface to the image of the 6th lens comes from the distance on this optical axis, and TTL is
The thing side of these the first lens comes from the distance on this optical axis to this image, and IMGH is the picture of this projection lens
Height, f is the effective focal length of this projection lens.
4. projection lens as claimed in claim 2, it is characterised in that these first lens meet following bar
Part:
-8≤f1/f≤-3.444
Wherein, f1For the effective focal length of these the first lens, f is the effective focal length of this projection lens.
5. projection lens as claimed in claim 2, it is characterised in that these second lens meet following bar
Part:
2.093≤f2/f≤2.988
Wherein, f2For the effective focal length of these the second lens, f is the effective focal length of this projection lens.
6. projection lens as claimed in claim 2, it is characterised in that these first lens, this is second saturating
Each lens at least one side of mirror, the 5th lens and the 6th lens be non-spherical surface or two faces all
For non-spherical surface.
7. projection lens as claimed in claim 2, it is characterised in that these first lens, the 5th saturating
Mirror and the 6th lens are made up of plastic material.
8. projection lens as claimed in claim 1, it is characterised in that the 3rd lens and the 4th
Lens meet following condition:
0.849≤f4/f≤1.1365
-2.7≤f34/f≤-1.4
Wherein, f4For the effective focal length of the 4th lens, f34For the 3rd lens and the 4th lens
Combination effective focal length, f is the effective focal length of this projection lens.
9. projection lens as claimed in claim 1, it is characterised in that the 5th lens meet following article
Part:
0.33≤f5/f≤1.255
Wherein, f5For the effective focal length of the 5th lens, f is the effective focal length of this projection lens.
10. projection lens as claimed in claim 1, it is characterised in that the 6th lens meet following article
Part:
2.07≤f6/f≤2.78
Wherein, f6For the effective focal length of the 6th lens, f is the effective focal length of this projection lens.
11. projection lens as claimed in claim 1, it is characterised in that the 3rd lens are by glass material
Matter is made.
12. projection lens as claimed in claim 1, it is characterised in that it further includes aperture, is arranged at
Between this first lens group and this second lens group.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510050345.2A CN105988194B (en) | 2015-01-30 | 2015-01-30 | Projection lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510050345.2A CN105988194B (en) | 2015-01-30 | 2015-01-30 | Projection lens |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105988194A true CN105988194A (en) | 2016-10-05 |
| CN105988194B CN105988194B (en) | 2019-03-15 |
Family
ID=57035558
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510050345.2A Expired - Fee Related CN105988194B (en) | 2015-01-30 | 2015-01-30 | Projection lens |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105988194B (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109283774A (en) * | 2018-11-09 | 2019-01-29 | 广景视睿科技（深圳）有限公司 | A kind of projection lens and optical projection system |
| CN110646928A (en) * | 2018-06-27 | 2020-01-03 | 宁波舜宇车载光学技术有限公司 | Optical lens |
| CN111965824A (en) * | 2020-08-26 | 2020-11-20 | 北京耐德佳显示技术有限公司 | Optical lens group and near-to-eye display system using same |
| CN113589496A (en) * | 2021-07-27 | 2021-11-02 | 深圳市凯润智能照明有限公司 | Optical system for film projection and projection equipment |
| CN114296219A (en) * | 2021-12-29 | 2022-04-08 | 歌尔股份有限公司 | Projection lens and projector |
| WO2023070810A1 (en) * | 2021-10-29 | 2023-05-04 | 歌尔光学科技有限公司 | Projection lens and projection device |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06230280A (en) * | 1993-02-02 | 1994-08-19 | Canon Inc | Two group zoom lens |
| EP1571479A3 (en) * | 2004-02-24 | 2006-01-04 | Samsung Electronics Co., Ltd. | Retrofocus type projection optical system |
| US20070058267A1 (en) * | 2005-09-14 | 2007-03-15 | Fujinon Corporation | Two-group zoom projection lens and projection display |
| CN101398531A (en) * | 2007-09-24 | 2009-04-01 | 鸿富锦精密工业（深圳）有限公司 | Zooming projection lens |
| TW201135343A (en) * | 2010-04-01 | 2011-10-16 | Hon Hai Prec Ind Co Ltd | Projection lens |
| CN102645724A (en) * | 2011-02-21 | 2012-08-22 | 中强光电股份有限公司 | Fixed focal lens |
| TW201248237A (en) * | 2011-05-27 | 2012-12-01 | Asia Optical Co Inc | Projection lens with fixed focal length |
| US20130100544A1 (en) * | 2011-10-19 | 2013-04-25 | Hon Hai Precision Industry Co., Ltd. | Projection lens system with high resolution and compact size |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6230280B2 (en) * | 2013-06-10 | 2017-11-15 | ユニキャリア株式会社 | Work vehicle rear periphery monitoring device |
-
2015
- 2015-01-30 CN CN201510050345.2A patent/CN105988194B/en not_active Expired - Fee Related
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06230280A (en) * | 1993-02-02 | 1994-08-19 | Canon Inc | Two group zoom lens |
| EP1571479A3 (en) * | 2004-02-24 | 2006-01-04 | Samsung Electronics Co., Ltd. | Retrofocus type projection optical system |
| US20070058267A1 (en) * | 2005-09-14 | 2007-03-15 | Fujinon Corporation | Two-group zoom projection lens and projection display |
| CN101398531A (en) * | 2007-09-24 | 2009-04-01 | 鸿富锦精密工业（深圳）有限公司 | Zooming projection lens |
| TW201135343A (en) * | 2010-04-01 | 2011-10-16 | Hon Hai Prec Ind Co Ltd | Projection lens |
| CN102645724A (en) * | 2011-02-21 | 2012-08-22 | 中强光电股份有限公司 | Fixed focal lens |
| TW201248237A (en) * | 2011-05-27 | 2012-12-01 | Asia Optical Co Inc | Projection lens with fixed focal length |
| US20130100544A1 (en) * | 2011-10-19 | 2013-04-25 | Hon Hai Precision Industry Co., Ltd. | Projection lens system with high resolution and compact size |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110646928A (en) * | 2018-06-27 | 2020-01-03 | 宁波舜宇车载光学技术有限公司 | Optical lens |
| CN110646928B (en) * | 2018-06-27 | 2022-01-21 | 宁波舜宇车载光学技术有限公司 | Optical lens |
| CN109283774A (en) * | 2018-11-09 | 2019-01-29 | 广景视睿科技（深圳）有限公司 | A kind of projection lens and optical projection system |
| CN111965824A (en) * | 2020-08-26 | 2020-11-20 | 北京耐德佳显示技术有限公司 | Optical lens group and near-to-eye display system using same |
| CN113589496A (en) * | 2021-07-27 | 2021-11-02 | 深圳市凯润智能照明有限公司 | Optical system for film projection and projection equipment |
| WO2023070810A1 (en) * | 2021-10-29 | 2023-05-04 | 歌尔光学科技有限公司 | Projection lens and projection device |
| CN114296219A (en) * | 2021-12-29 | 2022-04-08 | 歌尔股份有限公司 | Projection lens and projector |
| CN114296219B (en) * | 2021-12-29 | 2023-09-12 | 歌尔光学科技有限公司 | Projection lens and projector |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105988194B (en) | 2019-03-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| TWI534462B (en) | Projection lens | |
| TWI534471B (en) | Wide-angle lens | |
| CN106291886B (en) | Wide-angle lens | |
| CN105988194B (en) | Projection lens | |
| TWI542902B (en) | Wide-angle lens | |
| CN107132643A (en) | Wide-angle lens | |
| CN103777317B (en) | Slim camera lens | |
| CN105572839B (en) | Imaging lens | |
| CN108802976B (en) | imaging lens | |
| JP2014066993A (en) | Slim lens assembly | |
| CN106371197A (en) | Imaging lens | |
| CN107436474A (en) | Projection lens | |
| CN108957709A (en) | Wide-angle lens | |
| CN104155744B (en) | Zoom lens | |
| TWI480576B (en) | Wide-angle lens | |
| CN110058385A (en) | Wide-angle lens | |
| TW201730619A (en) | Wide-angle lens | |
| CN108957713A (en) | projection lens | |
| TWI491913B (en) | Lens assembly | |
| TWI676819B (en) | Camera device | |
| CN108345086A (en) | Imaging lens | |
| CN110231706A (en) | Imaging lens | |
| CN105759399B (en) | Imaging lens | |
| TW201544841A (en) | Wide-angle lens | |
| TWI735653B (en) | Lens assembly |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190315 Termination date: 20220130 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |