Canon Patent: Internal Liquid Cooling Device For Mirrorless Cameras

Canon Patent

Remember the Canon EOS R5 overheating soap opera? Maybe this Canon patent application comes from this hysteria.

Canon patent application 20220264767 (USA) discusses technology and methods for an active cooling system with magnetic fluid. The patent abstract:

This is pretty cool, me thinks: magnetic cooling fluid pumped by use of a magnetic field. The magnetic fluid is pumped through the camera body using magnets. Will we see it soon on a new Canon mirrorless camera?

More Canon patent applications are listed here. Some particularly interesting patent applications we think might get into production are these:

[via NL]

Canon Patent: 30-90mm f/1.5, 18-45mm f/1.5, 70-210mm f/2.5 Cinema Lenses

Canon Patent

A new Canon patent and for once it doesn’t refer to RF mount lenses but for Cinema optics: 30-90mm f/1.5, 18-45mm f/1.5, 70-210mm f/2.5.

Canon patent application 2022119007 (Japan) discusses optical formulas for three lenses we think are Cinema or broadcasting lenses:

  • 30-90mm f/1.5
  • 18-45mm f/1.5
  • 70-210mm f/2.5

From the patent literature:

To provide a zoom lens that is advantageous in terms of, for example, a large aperture, small size and light weight, and high optical performance over the entire zoom range.

The lens diameter of the lens group closest to the object side in the first lens group is determined by the off-axis ray at the wide-angle end, and the lens diameter of the lens group closest to the image side in the first lens group is determined by the on-axis ray at the telephoto end. Therefore, if the first lens group is thickened, the size of the lens will increase if the aperture is to be further increased. In the zoom lens of Patent Literature 1, since the first lens group is thick, the zoom lens may become large if it is intended to accommodate a large-format sensor such as a Super 35 format or a full-frame format while maintaining the F-number.

Example 1

  • Focal length: 31.20-89.85
  • F-value: 1.51
  • Half angle of view: 25.38-9.35
  • Total length: 284.23
  • Back focus: 39.00

Example 2

  • Focal length: 21.00-80.57
  • F-value: 1.51
  • Half angle of view: 35.17-10.41
  • Total length: 288.03
  • Back focus: 39.00

Example 3

  • Focal length: 18.01-45.01
  • F-value: 1.51
  • Half angle of view: 39.422-18.20
  • Total length: 308.88
  • Back focus: 39.00

More Canon patent applications are listed here. Some particularly interesting patent applications we think might get into production are these:

[via asobinet]

Canon Patent: Eye Control Autofocus For Mirrorless Cameras

Canon Patent

A new Canon patent application about eye controlled autofocus. Two patent applications, to be precise.

Cannon patent application 20220247904 (US) refers to a bigger sized mirrorless camera (like the EOS R3) and Canon patent application 20220247933 (US) to a smaller one. Here is the abstract for the former patent application:

And the abstract for the latter patent application:

More Canon patent applications are listed here. Some particularly interesting patent applications we think might get into production are these:

[via NL]

Canon Patent: RF 16-28mm Lens That Might Be f/2.8 or f/2.8-4 or f/4

Canon Patent

Here is a Canon patent application for a lens that might hit the shelves, sooner or later: RF 16-28mm.

Canon patent application 2022112179 (Japan) discusses optical formulas for an RF 16-28mm lens. Three optical formulas are discussed in the patent literature:

  • RF 16-28mm f/2.8
  • RF 16-28mm f/2.8-4
  • RF 16-28mm f/4

From the patent literature:

A zoom lens that is compact and has a wide angle of view while achieving high optical performance with little variation in aberration during zooming, and an imaging device and an imaging system having the zoom lens.

A photographing lens with a half angle of view exceeding 35 degrees is called a wide-angle lens, and is suitable for photographing a vast landscape by taking advantage of the wide angle of view. A wide-angle lens needs to satisfactorily correct distortion and curvature of field, which worsen as the half angle of view increases.

SUMMARY OF THE INVENTION

It is an object of the present invention to provide a zoom lens which is compact and has a wide angle of view, and which can obtain high optical performance with little aberration fluctuation during zooming, and an image pickup apparatus having the zoom lens.

Example 1

  • Focal length: 16.45-27.50
  • F-value: 2.88
  • Half angle of view: 52.70-39.08
  • Image height: 19.00-21.64
  • Total length: 138.01-127.30
  • Back focus: 14.00

Example 2

  • Focal length: 16.45-27.50
  • F-value: 2.88-4.00
  • Half angle of view: 52.740-38.91
  • Image height: 19.00-21.64
  • Overall length: 121.56-117.50
  • Back focus: 14.21

Example 3

  • Focal length: 16.45-27.50
  • F-value: 4.10
  • Half angle of view: 52.69-39.09
  • Image height: 19.00-21.64
  • Overall length: 124.60-121.49
  • Back focus: 14.08

More Canon patent applications are listed here. Some particularly interesting patent applications we think might get into production are these:

[via asobinet]

Canon Patent: RF 150-600mm f/8-11 Zoom Lens For EOS R System

Canon Patent

A new Canon patent, for a RF 150-600mm f/8-11 zoom lens.

Canon patent application 2022106401 (Japan) discusses optical formulas for a 150-600mm f/8-11 zoom lens for the RF mount.

PROBLEM TO BE SOLVED: To provide a compact and lightweight zoom lens having high optical performance in the entire zoom range.

Example 1

  • Focal length: 103.00-387.89
  • F value: 5.82-8.24
  • Half angle of view: 11.86-3.19
  • Image height: 21.64
  • Overall length: 183.21-258.38
  • Back focus: 39.88-81.93

Example 2

  • Focal length: 153.00-581.90
  • F value: 8.00-11.31
  • Half angle of view: 8.05-2.13
  • Image height: 21.64
  • Overall length: 274.81-354.89
  • Back focus: 68.40-126.51

More Canon patent applications are listed here. Some particularly interesting patent applications we think might get into production are these:

[via asobinet]

Canon Patent To Improve AF In Lenses With Reflective Optics

Canon Patent

A new Canon patent was spotted. Autofocus improvement for mirror lenses, i.e. lenses with a reflective optical system.

Canon patent application 2022103610 (Japan) discusses methods and technologies to improve autofocus on mirror lenses.

PROBLEM TO BE SOLVED: To provide a lens device capable of detecting an accurate defocus amount when a reflective optical system is used.

However, in the configurations disclosed in Patent Documents 1 and 2, when the central portion of the light flux is shielded by the reflective telephoto lens (catadioptric system), the image signal corresponds to the change in the vignetting direction of the AF light flux. The correction and the calculation of the conversion coefficient are not performed, and a focus detection error occurs.

Therefore, it is an object of the present invention to provide a lens device, an image pickup device, a control method of the lens device, and a program capable of detecting an accurate defocus amount when a reflective optical system is used.

More Canon patent applications are listed here. Some particularly interesting patent applications we think might get into production are these:

[via asobinet]