CN110531495A - A kind of single-lens reflex camera camera lens - Google Patents
A kind of single-lens reflex camera camera lens Download PDFInfo
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- CN110531495A CN110531495A CN201910786154.0A CN201910786154A CN110531495A CN 110531495 A CN110531495 A CN 110531495A CN 201910786154 A CN201910786154 A CN 201910786154A CN 110531495 A CN110531495 A CN 110531495A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/005—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having spherical lenses only
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
- G02B13/006—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element at least one element being a compound optical element, e.g. cemented elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
- G02B13/0075—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element having an element with variable optical properties
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Abstract
The invention discloses a kind of single-lens reflex camera camera lens, including iris S, the first lens set of positive focal length and negative lens G4 positioned at the side iris S；Negative lens G4 is between the first lens set and iris S；It further include the second lens set of negative focal length and positive focal length third lens set positioned at the other side iris S, the second lens set is between iris S and third lens set.Wherein, third lens set is a three balsaming lens groups.For the present invention when focal length is 35mm, maximum ring can reach F/1.5 or so, can be widely applied in the shooting process of digital camera, especially portrait.Due to using multi-disc spherical lens to be applied in combination, compared to the prior art aperture increases, and has significant technical effect.In addition, the present invention does not use non-spherical lens, cost is reduced.And due to the symmetry of three balsaming lens groups, processing and assembly cost are further reduced, the market competition of product is conducive to.
Description
Technical field
The present invention relates to the field of optical lens for photography, more particularly, to a kind of single-lens reflex camera camera lens.
Background technique
Slr camera refers to that light is irradiated on reflective mirror by single-lens, passes through the camera of Reflecting view-finding.Slr camera
Middle aperture is an extremely important index parameter.Aperture is the component for controlling lens opening size, to control the depth of field, mirror
Head imaging quality and with shutter Collaborative Control light-inletting quantity.
In general, aperture size is indicated with F value, for the camera lens manufactured, it cannot arbitrarily change the diameter of camera lens, but
Be can be by being added polygon or round inside camera lens, and the poroid grating of variable area is logical to reach control camera lens
Light quantity, this device are just called aperture, aperture F value=camera lens focal length/aperture bore.Aperture F value is smaller, i.e. expression aperture mouth
Diameter is bigger, and the light-inletting quantity within the same unit time is just more, i.e., aperture is bigger, and light-inletting quantity is more, and the depth of field is smaller, and picture compares
It is bright；Aperture is smaller, and light-inletting quantity is smaller, and the depth of field is bigger, and picture is than darker.
Single-lens reflex camera camera lens is used to need the depth of field of very little when shooting close up view, and a mode for reducing the depth of field is exactly to increase light
Circle.But large aperture can lead to the problem of senior aberration, so as to cause image quality decline.Therefore it for the single-lens reflex camera camera lens of large aperture, needs
Senior aberration is corrected.It can be very good correction senior aberration using non-spherical lens in the prior art, to obtain
Preferable image quality, but non-spherical lens price is high, causes the cost of single-lens reflex camera camera lens very high.
Summary of the invention
In view of this, the present invention provides a kind of single-lens reflex camera camera lens, maximum ring F/1.5, which does not use aspherical
Lens.
To achieve the above object, the present invention provides the following technical scheme that
A kind of single-lens reflex camera camera lens, including iris S, positioned at the first lens set of positive focal length of the side iris S and negative saturating
Mirror G4；Negative lens G4 is between the first lens set and iris S；
It further include the second lens set of negative focal length and positive focal length third lens set positioned at the other side iris S, the second mirror
Piece group is between iris S and third lens set.
As further scheme of the invention: the combined focal length of first lens set meets the following conditions:
fG1+G2+G3≤30mm
Wherein fG1+G2+G3Indicate the combined focal length of the first lens set.
As further scheme of the invention: first lens set includes positive lens G1, positive lens G2, and just saturating
Mirror G3, meets the following conditions:
fG1>=90mm, VG1≥50
fG2>=70mm, VG2≥40
fG3>=80mm, VG3≥60
Wherein: fG1And VG1Respectively indicate the focal length and abbe number of positive lens G1；fG2And VG2Respectively indicate positive lens G2's
Focal length and abbe number；fG3And VG3Respectively indicate the focal length and abbe number of positive lens G3.
As further scheme of the invention: the negative lens G4 meets condition: | fG4|≤30mm, VG4≤26；Wherein
fG4And VG4Respectively indicate the focal length and abbe number of positive lens G4.
As further scheme of the invention: second lens set is a double agglutination lens group, described double glued
Lens group includes negative lens G5 and positive lens G6, meets the following conditions:
|fG5|≤40mm, VG5≤26
fG6≤ 20mm, VG6≥40
Wherein: fG5And VG5Respectively indicate the focal length and abbe number of negative lens G5；fG6And VG6Respectively indicate positive lens G6's
Focal length and abbe number.
As further scheme of the invention: the negative lens G5 is bent moon negative lens, and the positive lens G6 is biconvex
Positive lens.
As further scheme of the invention: the third lens set is a three balsaming lens groups, and described three is glued
Lens group includes positive lens G7, negative lens G8, positive lens G9, and a combination thereof focal length meets the following conditions:
fG7+G8+G9≤31mm
Wherein fG7+G8+G9Indicate the combined focal length of third lens set.
As further scheme of the invention: the positive lens G7, negative lens G8, positive lens G9 meet the following conditions:
nG7=nG9
VG7=VG9
RG7A=| RG9B|
|RG7B|=| RG8A|=RG8B=RG9A
Wherein nG7And VG7Respectively indicate the refractive index and abbe number of positive lens G7, nG9And VG9Respectively indicate positive lens G9
Refractive index and abbe number, RG7A、RG8AAnd RG9APositive lens G7, negative lens G8 and positive lens G9 are respectively indicated close to object side table
The radius in face, RG7B、RG8BAnd RG9BPositive lens G7, negative lens G8 and positive lens G9 are respectively indicated close to the radius on image side surface.
As further scheme of the invention: the positive lens G7 is biconvex positive lens, and the negative lens G8 is concave-concave
Negative lens, the positive lens G9 are biconvex positive lens.
Beneficial effects of the present invention include but is not limited to:
(1) for single-lens reflex camera camera lens provided by the invention when focal length is 35mm, maximum ring can reach F/1.5 or so, object distance 3
Depth of field when rice is less than or equal to 10mm, and the depth of field is shallower, can be widely applied in the shooting process of digital camera, especially people
As shooting.Due to using multi-disc spherical lens to be applied in combination, compared to the prior art aperture increases, and has significant technology effect
Fruit.In addition, the present invention does not use non-spherical lens, cost is reduced, and application is more extensive.
(2) it is compared with the conventional senior aberration for correcting large aperture generation using non-spherical lens, the present invention uses three
Balsaming lens group reduces the senior aberration generated when larger by aperture.Simultaneously because the symmetry of three balsaming lens groups, subtracts
Small processing and assembly cost, are conducive to the market competition of product.
(3) single-lens reflex camera camera lens provided by the present invention, full filed angle are 42 ° or so, and relative illumination is more than or equal to 0.3, distortion
Less than or equal to 1%, purple boundary ratio chromatism, is less than or equal to 20 μm, and the transmission function of the 30lp/mm of 0.7 visual field is more than or equal to 0.5, as
Matter is higher.
Detailed description of the invention
Fig. 1 is a kind of optical system diagram of single-lens reflex camera camera lens provided by the invention；
Fig. 2 is modulation transfer function figure of the single-lens reflex camera camera lens of the offer of the embodiment of the present invention 1 at 60lp/mm, wherein T1 table
Show that meridian direction, S1 indicate sagitta of arc direction；
Fig. 3 is ratio chromatism, of the single-lens reflex camera camera lens of the offer of the embodiment of the present invention 1 in 0.45 μm of -0.65 μ m wavelength range
Figure；
Fig. 4 is the distortion figure for the single-lens reflex camera camera lens that the embodiment of the present invention 1 provides；
Fig. 5 is the relative illumination figure for the single-lens reflex camera camera lens that the embodiment of the present invention 1 provides；
Fig. 6 is the defocus transmission function figure for the single-lens reflex camera camera lens that the embodiment of the present invention 1 provides；
Fig. 7 is the actual imaging effect picture for the single-lens reflex camera camera lens that the embodiment of the present invention 1 provides.
Specific embodiment
The present invention is described in detail below with reference to embodiment, but the invention is not limited to these embodiments.
Fig. 1 is the optical system diagram of single-lens reflex camera camera lens provided by the invention, as shown in Figure 1, the single-lens reflex camera camera lens includes can darkening
Column S, the first lens set of positive focal length and negative lens G4 positioned at the side iris S；Negative lens G4 be located at the first lens set and
Between iris S；
It further include the second lens set of negative focal length and positive focal length third lens set positioned at the other side iris S, the second mirror
Piece group is between iris S and third lens set.
Reduce spherical aberration and color difference, method of the present invention using separation focal power, setting first while in order to converge light
Lens set is three eyeglasses, which is respectively: positive lens G1, positive lens G2, just
Lens G3.The combined focal length of first lens set meets the following conditions: fG1+G2+G3≤30mm.Three eyeglasses meet the following conditions:
fG1>=90mm, VG1≥50
fG2>=70mm, VG2≥40
fG3>=80mm, VG3≥60
Wherein: fG1+G2+G3Indicate the combined focal length of the first lens set；fG1And VG1Respectively indicate the focal length and color of positive lens G1
Dissipate coefficient；fG2And VG2Respectively indicate the focal length and abbe number of positive lens G2；fG3And VG3Respectively indicate positive lens G3 focal length and
Abbe number.
In order to reduce the color difference of first three positive lens of lens set generation, the present invention is arranged negative lens G4 and meets following item
Part: | fG4|≤30mm, VG4≤26；Wherein fG4And VG4Respectively indicate the focal length and abbe number of positive lens G4.
Second lens set includes two eyeglasses, which is respectively: negative lens
G5, positive lens G6 constitute a double agglutination lens group.Negative lens G5 can correct what positive lens behind the curvature of field and this lens generated
Color difference, positive lens G6 can converge the divergent rays that negative lens G4 and negative lens G5 is generated.Two eyeglasses meet following respectively
Condition:
|fG5|≤40mm, VG5≤26
fG6≤ 20mm, VG6≥40
Wherein: fG5And VG5Respectively indicate the focal length and abbe number of negative lens G5；fG6And VG6Respectively indicate positive lens G6's
Focal length and abbe number.
Third lens set is a three balsaming lens groups, is made of the both sides that two positive lens are glued at negative lens respectively.
The sequence of three eyeglasses from object side to image planes side is respectively: positive lens G7, negative lens G8, positive lens G9.Three gluing is thoroughly
Microscope group can converge to light image planes, while correct the senior aberration of large aperture generation.A combination thereof focal length meets the following conditions:
fG7+G8+G9≤31mm
Wherein fG7+G8+G9Indicate the combined focal length of third lens set.
In the present embodiment, in order to reduce processing cost, which meets the following conditions:
nG7=nG9
VG7=VG9
RG7A=| RG9B|
|RG7B|=| RG8A|=RG8B=RG9A
Wherein nG7And VG7Respectively indicate the refractive index and abbe number of positive lens G7, nG9And VG9Respectively indicate positive lens G9
Refractive index and abbe number, RG7A、RG8AAnd RG9APositive lens G7, negative lens G8 and positive lens G9 are respectively indicated close to object side table
The radius in face, RG7B、RG8BAnd RG9BPositive lens G7, negative lens G8 and positive lens G9 are respectively indicated close to the radius on image side surface.
Under above-mentioned condition, although the camera lens needs 9 eyeglasses, positive lens G7 and positive lens G9 are the same, therefore
As long as being equivalent to 8 sets of eyeglasses of processing.Moreover, again because of RG7A=| RG9B| and | RG8A|=RG8B, so the three glued part is in group
Without the concern for front and back sides when dress, assembling cost is reduced.
When single-lens reflex camera lens focus provided by the invention is 35mm, maximum ring can reach F/1.5 or so, can widely answer
For in the shooting process of digital camera, especially portrait, solve lens aperture in the prior art it is small, using aspherical
Glass lens bring problem at high cost, and the present invention uses three balsaming lens groups, utilizes the symmetrical of three balsaming lens groups
Property, further reduce processing and assembly cost.
Embodiment 1:
The combined focal length of the first lens set is 29.8mm in the present embodiment, and wherein positive lens G1 is plano-convex positive lens, just thoroughly
Mirror G2 is crescent moon positive lens, and positive lens G3 is crescent moon positive lens.Plano-convex positive lens G1, crescent moon positive lens G2 and crescent moon are just saturating
The specific value of mirror G3 is as follows:
fG1=106.3mm, VG1=53.9
fG2=76.1mm, VG2=42.7
fG3=91.2mm, VG3=68.6
Negative lens G4 is bent moon negative lens, and value is as follows:
|fG4|=28.9mm, VG4=25.7
Negative lens G5 in second lens set is bent moon negative lens, and focal length and abbe number be respectively | fG5|=
17.9mm VG5=25.0；Positive lens G6 is biconvex positive lens, and focal length and abbe number are respectively fG6=19.9mm, VG6=
40.8。
Positive lens G7 in third lens set is biconvex positive lens, and negative lens G8 is double-concave negative lens, and positive lens G9 is double
Convex positive lens, the combined focal length of third lens set are fG7+G8+G9=30.2mm, RG7A=| RG9B|=111.09, | RG7B|=| RG8A|
=RG8B=RG9A=33.146.
In the present embodiment, the airspace between plano-convex positive lens G1 and crescent moon positive lens G2 is 0.10mm；Crescent moon is just saturating
Airspace between mirror G2 and crescent moon positive lens G3 is 0.10mm；Air between crescent moon positive lens G3 and bent moon negative lens G4
Between be divided into 2.08mm；Airspace between bent moon negative lens G4 and iris S is 4.80mm；Iris S and bent moon are negative
Airspace between lens G5 is 6.51mm；Airspace between biconvex positive lens G6 and biconvex positive lens G7 is 0.1mm.
In the present embodiment, the parameter of each eyeglass is as shown in table 1.
The parameter of each eyeglass of 1 embodiment of table 1
Fig. 2-Fig. 7 is the parameter of the present embodiment single-lens reflex camera camera lens, logical using optical design software ZEMAX, CODEV or SIGMA
It crosses after Ray tracing and to generate.As seen from Figure 2,0.7 visual field meridian T1 and transmission function of the sagitta of arc S1 in 30lp/mm are all big
In 0.65, the tolerance of actual assembled camera lens is less than 0.15, therefore transmission function of the real lens in the 30lp/mm of 0.7 visual field is big
In equal to 0.5；As seen from Figure 3, the ratio chromatism, of full filed is less than 20 μm, the purple boundary very little of camera lens under the conditions of this；By
Fig. 4 can be seen that the distortion of full filed less than 1%, and rule of thumb, tolerance has little influence on distortion, therefore real lens is abnormal
Become again smaller than 1%；The relative illumination of full filed is greater than 30% as seen from Figure 5, and slowly reduces with visual field, such case
Under, phase chance autobalance exposes brightness, the case where being not in dark angle；As seen from Figure 6, depth of focus is about 0.1mm (In
Here the definition of depth of focus is that 30lp/mm transmission function drops to 0.2 range), to the magnifying powers of 3 meters of object distances be focal length/object distance=
0.012, therefore the depth of field is 0.1mm/0.012=8.33mm, meets design requirement.As seen from Figure 7, actual photographed effect
The depth of field is not it is obvious that the same object for being placed in 50mm behind subject sees Chu completely.
When single-lens reflex camera lens focus provided by the invention is 35mm, maximum ring can reach F/1.5 or so, can widely answer
For in the shooting process of digital camera, especially portrait, solve lens aperture in the prior art it is small, using aspherical
Glass lens bring problem at high cost, and the present invention uses three balsaming lens groups, utilizes the symmetrical of three balsaming lens groups
Property, further reduce processing and assembly cost.
Embodiment 2:
The combined focal length of the first lens set is 30.0mm in the present embodiment, and wherein positive lens G1 is plano-convex positive lens, just thoroughly
Mirror G2 is crescent moon positive lens, and positive lens G3 is crescent moon positive lens.Plano-convex positive lens G1, crescent moon positive lens G2 and crescent moon are just saturating
The specific value of mirror G3 is as follows:
fG1=99.1mm, VG1=53.9
fG2=84.9mm, VG2=42.7
fG3=87.7mm, VG3=68.6
Negative lens G4 is bent moon negative lens, and value is as follows:
|fG4|=28.9mm, VG4=25.7
Negative lens G5 in second lens set is bent moon negative lens, and focal length and abbe number be respectively | fG5|=
32.8mm VG5=25.0；Positive lens G6 is biconvex positive lens, and focal length and abbe number are respectively fG6=19.7mm, VG6=
40.8。
Positive lens G7 in third lens set is biconvex positive lens, and negative lens G8 is double-concave negative lens, and positive lens G9 is double
Convex positive lens, the combined focal length of third lens set are fG7+G8+G9=30.4mm, RG7A=| RG9B|=100.82, | RG7B|=| RG8A|
=RG8B=RG9A=36.90.
In the present embodiment, the airspace between plano-convex positive lens G1 and crescent moon positive lens G2 is 0.10mm；Crescent moon is just saturating
Airspace between mirror G2 and crescent moon positive lens G3 is 0.10mm；Air between crescent moon positive lens G3 and bent moon negative lens G4
Between be divided into 2.56mm；Airspace between bent moon negative lens G4 and iris S is 4.82mm；Iris S and bent moon are negative
Airspace between lens G5 is 6.61mm；Airspace between biconvex positive lens G6 and biconvex positive lens G7 is
0.15mm。
In the present embodiment, the parameter of each eyeglass is as shown in table 2.
The parameter of each eyeglass of 2 embodiment of table 2
When single-lens reflex camera lens focus provided by the invention is 35mm, maximum ring can reach F/1.5 or so, can widely answer
For in the shooting process of digital camera, especially portrait, solve lens aperture in the prior art it is small, using aspherical
Glass lens bring problem at high cost, and the present invention uses three balsaming lens groups, utilizes the symmetrical of three balsaming lens groups
Property, further reduce processing and assembly cost.
Embodiment 3:
The combined focal length of the first lens set is 30.0mm in the present embodiment, and wherein positive lens G1 is plano-convex positive lens, just thoroughly
Mirror G2 is crescent moon positive lens, and positive lens G3 is crescent moon positive lens.Plano-convex positive lens G1, crescent moon positive lens G2 and crescent moon are just saturating
The specific value of mirror G3 is as follows:
fG1=97.4mm, VG1=53.9
fG2=85.3mm, VG2=42.7
fG3=88.45mm, VG3=68.6
Negative lens G4 is bent moon negative lens, and value is as follows:
|fG4|=28.9mm, VG4=25.7
Negative lens G5 in second lens set is bent moon negative lens, and focal length and abbe number be respectively | fG5|=
32.9mm VG5=25.0；Positive lens G6 is biconvex positive lens, and focal length and abbe number are respectively fG6=19.7mm, VG6=
40.8。
Positive lens G7 in third lens set is biconvex positive lens, and negative lens G8 is double-concave negative lens, and positive lens G9 is double
Convex positive lens, the combined focal length of third lens set are fG7+G8+G9=30.4mm, RG7A=| RG9B|=101.57, | RG7B|=| RG8A|
=RG8B=RG9A=36.68.
In the present embodiment, the airspace between plano-convex positive lens G1 and crescent moon positive lens G2 is 0.10mm；Crescent moon is just saturating
Airspace between mirror G2 and crescent moon positive lens G3 is 0.10mm；Air between crescent moon positive lens G3 and bent moon negative lens G4
Between be divided into 2.57mm；Airspace between bent moon negative lens G4 and iris S is 4.81mm；Iris S and bent moon are negative
Airspace between lens G5 is 6.61mm；Airspace between biconvex positive lens G6 and biconvex positive lens G7 is 0.1mm.
In the present embodiment, the parameter of each eyeglass is as shown in table 3.
The parameter of each eyeglass of 3 embodiment of table 3
When single-lens reflex camera lens focus provided by the invention is 35mm, maximum ring can reach F/1.5 or so, can widely answer
For in the shooting process of digital camera, especially portrait, solve lens aperture in the prior art it is small, using aspherical
Glass lens bring problem at high cost, and the present invention uses three balsaming lens groups, utilizes the symmetrical of three balsaming lens groups
Property, further reduce processing and assembly cost.
The above is only several embodiments of the present invention, not any type of limitation is done to the present invention, although this hair
It is bright to be disclosed as above with preferred embodiment, however be not intended to limit the invention, any person skilled in the art, it is not taking off
In the range of technical solution of the present invention, a little variation or modification are made using the technology contents of the disclosure above and is equal to
Case study on implementation is imitated, is belonged in technical proposal scope.
Claims (9)
1. a kind of single-lens reflex camera camera lens, which is characterized in that the first eyeglass of positive focal length including iris S, positioned at the side iris S
Group and negative lens G4；Negative lens G4 is between the first lens set and iris S；
It further include the second lens set of negative focal length and positive focal length third lens set positioned at the other side iris S, the second lens set
Between iris S and third lens set.
2. single-lens reflex camera camera lens according to claim 1, which is characterized in that the combined focal length of first lens set, meet with
Lower condition:
fG1+G2+G3≤30mm
Wherein fG1+G2+G3Indicate the combined focal length of the first lens set.
3. single-lens reflex camera camera lens according to claim 1, which is characterized in that first lens set includes positive lens G1, just thoroughly
Mirror G2 and positive lens G3, meets the following conditions:
fG1>=90mm, VG1≥50
fG2>=70mm, VG2≥40
fG3>=80mm, VG3≥60
Wherein: fG1And VG1Respectively indicate the focal length and abbe number of positive lens G1；fG2And VG2Respectively indicate the focal length of positive lens G2
And abbe number；fG3And VG3Respectively indicate the focal length and abbe number of positive lens G3.
4. single-lens reflex camera camera lens according to claim 1, which is characterized in that the negative lens G4 meets condition: | fG4|≤30mm,
VG4≤26；Wherein fG4And VG4Respectively indicate the focal length and abbe number of positive lens G4.
5. single-lens reflex camera camera lens according to claim 1, which is characterized in that second lens set is a cemented doublet
Group, the double agglutination lens group include negative lens G5 and positive lens G6, meet the following conditions:
|fG5|≤40mm, VG5≤26
fG6≤ 20mm, VG6≥40
Wherein: fG5And VG5Respectively indicate the focal length and abbe number of negative lens G5；fG6And VG6Respectively indicate the focal length of positive lens G6
And abbe number.
6. single-lens reflex camera camera lens according to claim 5, which is characterized in that the negative lens G5 be bent moon negative lens, it is described just
Lens G6 is biconvex positive lens.
7. single-lens reflex camera camera lens according to claim 1, which is characterized in that the third lens set is three balsaming lens
Group, the three balsaming lens group include positive lens G7, negative lens G8, positive lens G9, and a combination thereof focal length meets the following conditions:
fG7+G8+G9≤31mm
Wherein fG7+G8+G9Indicate the combined focal length of third lens set.
8. single-lens reflex camera camera lens according to claim 7, which is characterized in that the positive lens G7, negative lens G8, positive lens G9 are full
Sufficient the following conditions:
nG7=nG9
VG7=VG9
RG7A=| RG9B|
|RG7B|=| RG8A|=RG8B=RG9A
Wherein nG7And VG7Respectively indicate the refractive index and abbe number of positive lens G7, nG9And VG9Respectively indicate the folding of positive lens G9
Penetrate rate and abbe number, RG7A、RG8AAnd RG9APositive lens G7, negative lens G8 and positive lens G9 are respectively indicated close to object side surface
Radius, RG7B、RG8BAnd RG9BPositive lens G7, negative lens G8 and positive lens G9 are respectively indicated close to the radius on image side surface.
9. single-lens reflex camera camera lens according to claim 8, which is characterized in that the positive lens G7 is biconvex positive lens, described negative
Lens G8 is double-concave negative lens, and the positive lens G9 is biconvex positive lens.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910786154.0A CN110531495B (en) | 2019-08-23 | 2019-08-23 | Single lens reflex |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910786154.0A CN110531495B (en) | 2019-08-23 | 2019-08-23 | Single lens reflex |
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| Publication Number | Publication Date |
|---|---|
| CN110531495A true CN110531495A (en) | 2019-12-03 |
| CN110531495B CN110531495B (en) | 2020-07-31 |
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| CN201910786154.0A Active CN110531495B (en) | 2019-08-23 | 2019-08-23 | Single lens reflex |
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