The latest patent reveals Canon working on an ultrawide range of RF Mount lenses. Japanese website spotted all the three lens patents that Canon is currently working on.
Applicant: Canon Inc.
Publication Number: P2022065512
Application Number: P 2020174139
Publication Date: 2022-04-27 Title
of Invention: Zoom Lens and Imaging Device
PROBLEM TO BE SOLVED: To suppress aberration fluctuation at the time of magnification change in a small and wide-angle zoom lens.
As a wide-angle zoom lens, Patent Document 1 and Patent Document 2 disclose a zoom lens that moves the first lens group on the most object side to perform scaling.
However, in the zoom lenses disclosed in Patent Documents 1 and 2, the length of the back focus increases the diameter of the first lens group, and the weight of the first lens group to be moved at the time of scaling increases. Moreover, since a wide-angle lens uses a plurality of large-diameter lenses to widen the angle and correct distortion, the weight of the first lens group tends to increase. As a result, it becomes difficult to suppress an increase in aberration due to eccentricity during the movement of the first lens group.
In the present invention, there is provided a compact zoom lens capable of suppressing aberration fluctuations at the time of scaling while having a wide angle.
Example 1 (9-18mm F4)
Focal length 9.28 13.05 17.45
F number 4.12 4.12 4.12
Half angle of view (°) 64.01 58.13 51.11
Image height 19.04 20.99 21.64
Lens overall length 130.93 130.93 130.93
Back focus 16.86 14.84 24.07
Example 2 (11-24mm F4)
Focal length 11.33 16.1 23.42
F number 4.12 4.12 4.12
Half angle of view (°) 59.84 52.13 42.73
Image height 19.5 20.7 21.64
Lens total length 154.86 154.86 154.86
Back focus 22 17.55 25.32
Example 3 (10-20mm F4)
Focal length 10.3 14.81 20
F number 4.12 4.12 4.12
Half angle of view (°) 62.16 54.43 47.25
Image height 19.5 20.7 21.64
Lens overall length 126.84 126.84 126.84
Back focus 20.24 18.24 32.59
Example 4 (10-20mm F4) Focal length 10.3 14.8 20
F number 4.12 4.12 4.12
Half angle of view (°) 62.16 54.44 47.25
Image height 19.5 20.7 21.64
Lens total length 129.57 129.57 129.57
Back focus 20 16.89 18.38
As usual, we know that a patent takes at least 2 years of time to become a real product. And at the same time, all the patents do not always get’s approved. So, here we are not so sure which of the three lenses will arrive as a real product in the market.
See more patent
Canon Patent Modular Assembly Camera
Canon Patent – Smart Band With Camera
Canon Patent – Working on a New Adapter
More Canon RF Lenses Patent Details
- Canon 85mm f/1.2,
- Canon 100mm f/1.4,
- Canon 24-70mm f/2.8, and
- Canon 28-85mm f/2-2.8
source digicameinfo
