Canon Patent: Imaging Sensor Protection Mechanism

Canon Patent

Here is an interesting Canon patent: a mechanism to protect the sensor from dust and dirt while no lens is attached.

Canon patent application P2021-103248A discusses a technology able to protect the imaging sensor of a camera from dust and dirt when no lens is mounted (e.g. while changing lens). From the patent literature:

PROBLEM TO BE SOLVED: To provide an image pickup apparatus with a barrier mechanism capable of being arranged in a small space while avoiding interference with components other than the barrier mechanism.

When the interchangeable lens is removed from the interchangeable lens type image pickup device (camera), dust may enter the camera through the opening of the mount and adhere to the image pickup element. Therefore, the image pickup device may be equipped with a barrier mechanism that protects the image pickup element by closing the opening of the mount. Patent Document 1 discloses a barrier mechanism configured such that a barrier closes an opening of a mount when the lens is not attached and the barrier is opened by rotation when the lens is attached.

As asobinet.com rightfully notices, the patent is not for a “compact shutter unit”, as wrongfully stated by some sites:

Some overseas information sites misrepresent it as a “compact shutter unit”, but it is just a shutter mechanism for “sensor protection” and a technology to prevent dust from adhering to the sensor when changing lenses. is. The compact sensor barrier seems to be a space-saving design that suppresses interference with other parts.

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

Canon Patent For “Subject Blur Correction” (computational photography)

Cano Patent

Here is anew Canon patent application. Not for an RF mount lens for once but for computational photography.

Canon patent application 2021-96460 (Japan) discusses methods and algorithms to reduce the blur of a photographed subject. The technology automatically detects the subject and corrects blur. From the patent literature (machine translated):

To provide an image blur correction device capable of obtaining an image blur correction effect desired by a user. Since the amount of shake (direction and magnitude of shake) is generally different between “camera shake” and “subject shake”, it is not possible to completely correct both. Therefore, for example, [the patent] discloses a technique for correcting “subject shake” when a subject’s face is detected and correcting “camera shake” when a subject’s face is not detected.

The algorithm can differentiate between a moving subject and a not firmly hold camera, and correct the blur depending by the situation. The amount of correction can be set by the user. More form the Canon patent application:

It is considered that which of “camera shake” and “subject shake” should be corrected depends on the intention of the user (target of interest) in the shooting scene. For example, when the user pays attention to the background, it is desirable that the “camera shake”, which is the shake of the entire screen, is corrected. On the other hand, when the user is paying attention to the main subject, it is desirable that the “subject shake” is corrected. Therefore, it is necessary to appropriately control the shake correction target according to the user’s intention that changes with the shooting scene.

Interesting patent application. Expect this technology on your future Canon camera.

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

[via asobinet.com]

Canon Patent: RF 24mm f/1.2, RF 28mm f/1.2 and RF 35mm f/1.2 Lenses

Canon Patent

And yet another Canon patent for RF mount lenses, spotted by asobinet.com.

Canon patent application P2021-92694A (Japan) discusses optical formulas for RF 24mm f/1.2, RF 28mm f/1.2 and RF 35mm f/1.2 lenses for the Canon EOS R full frame mirrorless camera system. We think these patents might well go into production.

canon patent

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

Canon Patent For Zoom Lenses For The RF Mount And APS-C Sensor

Canon Patent

Here is an interesting Canon patent application spotted by asobinet.com.

The Canon patent application seems to discuss optical formulas for various zoom lenses for the RF mount, and for APS-C sensors.

Not sure what to think about this patent. Any idea?

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

Canon Patent: 83mm f/1.4 For The Canon RF Mount

Canon Patent

And here is another Canon patent for an RF mount lens.

Spotted by Hi Lows Note, Canon patent application 2021-81531A (Japan) discusses optical formulas for a 83mm f/1.4 lens for full frame mirrorless cameras, i.e. for the EOS R camera system.

Embodiment 1

  • Focal length (mm): 82.87
  • F number: 1.45
  • Half angle of view (degree): 14.63
  • Image height (mm): 21.64
  • Lens length (mm): 126.50
  • Back focus (mm): 13.00

Embodiment 2

  • Focal length (mm): 82.86
  • F number: 1.45
  • Half angle of view (degree): 14.63
  • Image height (mm): 21.64
  • Lens length (mm): 128.50
  • Back focus (mm): 17.13

Embodiment 3

  • Focal length (mm): 82.64
  • F number: 1.45
  • Half angle of view (degree): 14.67
  • Image height (mm): 21.64
  • Lens length (mm): 113.70
  • Back focus (mm): 18.16

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

Canon Patent: 19mm f/2.8 Lens For Full Frame Mirrorless Camera Systems

Canon Patent

Here is another Canon patent for an RF mount lens. And again it is for a lens for the RF mount.

Canon patent application P2021-67826A (Japan) discusses optical formulas for a 19mm f/2.8 lens or a full frame mirrorless camera, the EOS R. The patent was spotted by Hi Lows Note.

Embodiment 1

  • Focal length: 19.50 mm
  • F number: 2.88
  • Half angle of view (degree): 47.99
  • Image Height: 21.65 mm
  • Lens length: 96.33 mm
  • Back focus: 18.34 mm

Embodiment 5

  • Focal length: 19.29 mm
  • F number: 2.86
  • Half angle of view (degree): 48.30
  • Image Height: 21.65 mm
  • Lens length: 96.59 mm
  • Back focus: 18.43 mm