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]
