Very interesting patent for 15-43mm f/2-4 lens for APS-C sensors that may point to the upcoming Canon Powershot G1 X Mark III camera, rumored to have an APS-C sensor.
Zoom ratio: 2.74
Focal length: 15.65 29.18 42.90
F No.: 2.06 2.99 4.00
Half angle: 41.12 25.09 17.66
Image height: 13.66 13.66 13.66
Back focus: 8.52 8.01 7.20
Patent literature is hard to grasp. Any help is welcome.
In a zoom lens from which an interval of a lens group which comprises the 1st lens group of negative refracting power, the 2nd lens group of positive refracting power, the 3rd lens group of positive refracting power, the 4th lens group of negative refracting power, and the 5th lens group of positive refracting power, and is adjacent to on the occasion of zooming arranged in order from the object side to the image side changes, between said 2nd lens group and the 3rd lens group, have an aperture diaphragm and said 4th lens group moves on the occasion of focusing — said 4th lens group — most — a curvature radius of a lens surface on the object side — a time of setting a curvature radius of a lens surface on the image side to R4b most of R4a and said 4th lens group, 0.2<(R4b+R4a)/(R4b-R4a)<3.0 A zoom lens satisfying a becoming conditional expression.
Interesting Canon patent to reduce flare in difrractive optical elements. Let’s start with the abstract:
Basically, this means that an aluminium coating is applied to diffractive lens elements, in order to reduce light scattering. The aluminium layer is applied with an angle (you see it in the pictures), and is then partially oxidised so that the aluminium coating becomes transparent. According to the patents claim, flare is massively reduced (up to eight times).
Canon patent to improve off-axis AF when using Dual Pixel AF. Offset microlenses and unequal pixel size improve off axis Dual Pixel AF performance. The patent’s abstract:
Canon patent for an optical formula for a 12-60mm f/2-4 lens for 1.5″ sensors. This resolves to 24-105mm on 35mm equivalent. The PowerShot G1 X Mark II has an 1.5″ sensor, and a similar lens. Does this patent refer to the Powershot G1 X Mark III?
Patent publication number 2016-212248
Release date 2016.12.15
Application date 2015.5.8
Example
Zoom ratio 4.72
Focal length 12.84 20.16 60.62
F number 2.06 3.50 4.02
Half angle of view (degree) 41.74 28.80 10.33
Image height 9.22 10.23 11.25
Lens total length 83.06 84.07 101.55
BF 8.02 12.32 13.44
Is this patent referring the next iteration of the PowerShot G1 X series?
Excerpt for the patent literature (machine translated):
[Claim(s)]
[Claim 1]
In order, it comprises an object side to the image side from a rear group which has the 1st lens group of positive refracting power, the 2nd lens group of negative refracting power, the 3rd lens group of positive refracting power, and one or more lens groups,
It is a zoom lens from which an interval of said 1st lens group and said 2nd lens group spreads on the occasion of zooming from a wide angle end to telephoto end, and an interval of a lens group in which an interval of said 2nd lens group and said 3rd lens group is adjacent to on the occasion of narrowing and zooming changes,
Said 1st lens group has a positive lens and a negative lens,
When an Abbe number of material of a positive lens contained in said 1st lens group is set to nu1p and relative partial dispersion is set to thetagF1p, it is said 1st lens group,
nu1p<60.0
1.571×10 -5xnu1p2-3.437×10 -3xnu1p+6.976×10 -1<thetagF1p
It has the positive lens G1p with which it is satisfied of a becoming conditional expression,
When an Abbe number of material of a negative lens contained in said 1st lens group is set to nu1n and relative partial dispersion is set to thetagF1n, it is said 1st lens group,
nu1n<27.0
thetagF1n<-2.750×10 -3xnu1n+6.820×10 -1
It has the negative lens G1n with which it is satisfied of a becoming conditional expression,
When setting a focal distance of the whole system [ in / for a focal distance of the aforementioned positive lens G1p / f1p and a wide angle end ] to fw,
2.6<f1p/fw<30.0
A zoom lens satisfying a becoming conditional expression.
[Claim 2]
When setting an aforementioned negative lens [ G1n ] focal distance to f1n,
-50.0<f1n/fw<-6.0
The zoom lens according to claim 1 satisfying a becoming conditional expression.
[Claim 3]
When setting a focal distance of d1n and said 1st lens group to f1 for aforementioned negative lens [ G1n ] center thickness,
0.005<d1n/f1<0.050
The zoom lens according to claim 1 or 2 satisfying a becoming conditional expression.
[Claim 4]
When setting a focal distance of d1p and said 1st lens group to f1 for center thickness of the aforementioned positive lens G1p,
0.030<d1p/f1<0.200
A zoom lens of a description in any 1 item of Claims 1-3 satisfying a becoming conditional expression.
[Claim 5]
When the aforementioned positive lens G1p is arranged at the aforementioned negative lens [ G1n ] image side and a focal distance of d1a and said 1st lens group is set to f1 for distance on an optic axis from a lens surface on the image side which is the aforementioned negative lens G1n to a lens surface on the object side of the aforementioned positive lens G1p,
0.002<d1a/f1<0.070
A zoom lens of a description in any 1 item of Claims 1-4 satisfying a becoming conditional expression.
[Claim 6]
In a zoom lens of a description in any 1 item of Claims 1-5,
-0.002<(thetagF1n-thetagF1p)/(nu1 n-nu 1p) <0.002
A zoom lens satisfying a becoming conditional expression.
[Claim 7]
When setting a refractive index of aforementioned negative lens [ G1n ] material to N1n,
1.77<N1n
A zoom lens of a description in any 1 item of Claims 1-6 satisfying a becoming conditional expression.
[Claim 8]
When setting a focal distance of said 1st lens group to f1,
3.0<f1/fw<50.0
A zoom lens of a description in any 1 item of Claims 1-7 satisfying a becoming conditional expression.
[Claim 9]
When setting a focal distance of said 2nd lens group to f2,
-5.0<f2/fw<-0.5
A zoom lens of a description in any 1 item of Claims 1-8 satisfying a becoming conditional expression.
[Claim 10]
When setting a focal distance of said 3rd lens group to f3,
1.3<f3/fw<8.0
A zoom lens of a description in any 1 item of Claims 1-9 satisfying a becoming conditional expression.
[Claim 11]
When setting movement magnitude of said 1st lens group for zooming from a wide angle end to telephoto end to M1,
-20.0<M1/fw<-0.7
A zoom lens of a description in any 1 item of Claims 1-10 satisfying a becoming conditional expression.
[Claim 12]
When setting movement magnitude of said 3rd lens group for zooming from a wide angle end to telephoto end to M3,
-6.0<M3/fw<-0.1
A zoom lens of a description in any 1 item of Claims 1-11 satisfying a becoming conditional expression.
[Claim 13]
A zoom lens of a description in any 1 item of Claims 1-12, wherein the aforementioned rear group comprises an object side in order to the image side from the 4th lens group of negative refracting power, and the 5th lens group of positive refracting power.
[Claim 14]
A zoom lens of a description in any 1 item of Claims 1-12, wherein the aforementioned rear group comprises the 4th lens group of positive refracting power.
[Claim 15]
A zoom lens of a description in any 1 item of Claims 1-12, wherein the aforementioned rear group comprises an object side in order to the image side from the 4th lens group of positive refracting power, the 5th lens group of negative refracting power, and the 6th lens group of positive refracting power.
[Claim 16]
A zoom lens of a description in any 1 item of Claims 1-12, wherein the aforementioned rear group comprises an object side in order to the image side from the 4th lens group of positive refracting power, and the 5th lens group of negative refracting power.
[Claim 17]
An imaging device comprising:
A zoom lens of a description in any 1 item of Claims 1-16.
An optoelectric transducer which carries out light reception of the image formed by the zoom lens.
[via Egami]
Interesting Canon patent for a 3.6-255mm f/2.8-7 lens for PowerShot cameras. The interesting fact: the lens has a built-in extender. With the extender, this lens becomes a 1000mm f/10 (35mm equivalent).
Patent publication number 2016-212210
Publication date 2016.12.15
Application date 2015.5.7
Example 1
Zoom ratio 66.07
Focal length 3.71 10.16 245.00
F number 2.90 4.99 7.07
Half angle of view (degree) 40.59 20.88 0.91
Lens total length 94.31 86.88 150.26
BF 9.45 16.24 9.56
Lens construction 11 groups 14 pieces
Aspheric surface 3 surfaces 2 pieces
UD 2
Super UD 1
Super telephoto (D)
Focal length 359.99
F number 10.39
Half angle of view (degree) 0.62
Lens total length 150.26
BF 3.56
Lens composition 13 groups 17 sheets
Aspheric surface 3 surfaces 2 pieces
UD 3
Super UD 1
Excerpt from the patent literature (note: machine translated):
[Claim(s)]
[Claim 1]
They are a main lens system which has a focus lens system which moves on the occasion of focusing, and an optical system which has a converter lens system which expands a focal distance of the whole system,
The aforementioned converter lens system is removable to space formed when the aforementioned focus lens system moves on the occasion of focusing,
When the aforementioned converter lens system has the lens part Gn of negative refracting power, and the lens part Gp of positive refracting power from the object side in order to the image side bordering on the widest air spacing in optical axis direction and a focal distance of fN and the aforementioned lens part Gp is set to fP for a focal distance of the aforementioned lens part Gn,
-9.3<fP/fN<-1.0
An optical system satisfying a becoming conditional expression.
[Claim 2]
When [ of the aforementioned converter lens system ] setting a curvature radius of a lens surface on the object side to Rf and setting to Rr a curvature radius which is a lens surface on the image side most most,
2.0<(Rf+Rr)/(Rf-Rr)<100.0
The optical system according to claim 1 satisfying a becoming conditional expression.
[Claim 3]
the aforementioned lens part Gn — most — a curvature radius of a lens surface on the image side — a time of setting a curvature radius of a lens surface on the object side to Rpf most of Rnr and the aforementioned lens part Gp,
-600.0<(Rnr+Rpf)/(Rnr-Rpf)<0.0
The optical system according to claim 1 or 2 satisfying a becoming conditional expression.
[Claim 4]
An optical system of a description in any 1 item of Claims 1-3 characterized by comprising the following.
A positive lens of meniscus shape in which the aforementioned lens part Gn turned a concave surface to the image side in order from the object side at the object side.
Both lens surfaces comprise a cemented lens which joined a negative lens of concave shape, and, as for the aforementioned lens part Gp, the image side is a positive lens of a convex configuration.
[Claim 5]
The aforementioned optical system is Sk about distance of the aforementioned converter lens system when it consists of zoom lenses and equips with the aforementioned converter lens system on an optic axis which it is most on an optic axis from a lens surface on the image side to the image surface. When [ of the aforementioned main lens system when the aforementioned main lens system is not equipped with the aforementioned converter lens system in telephoto end ] setting distance on an optic axis from a lens surface on the object side to the image surface to TD most,
0.005<Sk/TD<0.060
An optical system of a description in any 1 item of Claims 1-4 satisfying a becoming conditional expression.
[Claim 6]
When [ of the aforementioned focus lens system / in / the aforementioned optical system consists of zoom lenses, and / telephoto end ] setting thickness on an optic axis of SSk and the aforementioned converter lens system to CTD for distance on an optic axis from a lens surface on the image side to the image surface most,
0.50<SSk/CTD<1.40
An optical system of a description in any 1 item of Claims 1-5 satisfying a becoming conditional expression.
[Claim 7]
When setting thickness on an optic axis of M and the aforementioned converter lens system to CTD for movement magnitude of the aforementioned focus lens system when the aforementioned optical system consists of zoom lenses and it equips with the aforementioned converter lens system on an optic axis in telephoto end,
0.50<M/CTD<1.40
An optical system of a description in any 1 item of Claims 1-6 satisfying a becoming conditional expression.
[Claim 8]
The aforementioned optical system is TD most about distance on an optic axis from a lens surface on the object side to the image surface, when it consists of zoom lenses and is not equipped with the aforementioned converter lens system on an optic axis in telephoto end. It is TD/TDA=1.0, when it equips with the aforementioned converter lens system on an optic axis and distance on an optic axis from a lens surface on the object side to the image surface is most set to TDA.
An optical system of a description in any 1 item of Claims 1-7 satisfying a becoming conditional expression.
[Claim 9]
It is a zoom lens provided with a focus lens system which the aforementioned main lens system has a plurality of lens groups, and an interval of a lens group which is adjacent to on the occasion of zooming changes, and moves on the occasion of focusing,
An optical system of a description in any 1 item of Claims 1-8, wherein space formed when the aforementioned focus lens system moves in telephoto end is equipped with the aforementioned converter lens system.
[Claim 10]
To order, the aforementioned main lens system is the 1st lens group of positive refracting power from the object side to the image side. The 2nd lens group of negative refracting power, the 3rd lens group of positive refracting power, the 4th lens group of negative refracting power, It is a zoom lens from which an interval of a lens group which comprises the 5th lens group of positive refracting power, and is adjacent to on the occasion of zooming changes, An optical system of a description in any 1 item of Claims 1-8, wherein space which said 5th lens group is the aforementioned focus lens system, and is formed when said 5th lens group moves in telephoto end is equipped with the aforementioned converter lens system.
[Claim 11]
To order, the aforementioned main lens system is the 1st lens group of positive refracting power from the object side to the image side. The 2nd lens group of negative refracting power, the 3rd lens group of positive refracting power, the 4th lens group of negative refracting power, It comprises the 5th lens group of positive refracting power, and the 6th lens group of positive refracting power, It is a zoom lens from which an interval of a lens group which is adjacent to on the occasion of zooming changes, An optical system of a description in any 1 item of Claims 1-8, wherein space which said 5th lens group is the aforementioned focus lens system, and is formed when said 5th lens group moves in telephoto end is equipped with the aforementioned converter lens system.
[Claim 12]
An imaging device having a solid state image pickup device which carries out light reception of the image formed by Claim 1 thru/or an optical system and the optical system of a description in any 1 item of Claim 11.
[via Egami]
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