Canon Files Patent For High-Res Images Obtained By Pixel Shift

2013_74337_fig02

Image courtesy: Egami

Egami (translated) spotted a patent filed by Canon that appears to be for high resolution pictures that are obtained by combining different shots. Basically a continuous shooting situation where you build a final image based on the images that have been shot. Motion could obviously be a big problem.

  • Patent Publication No. 2013-74337
    • Publication date 2013.4.22
    • Filing date 2011.9.26
  • If there is misalignment of the sub-pixels, it can obtain a high resolution image from a low resolution image
  • Canon patent
    • By continuous shooting and combining pixel shift, I get a high-resolution image
    • Method of pixel shift, lens and image sensor shift of
    • By setting appropriately the displacement amount corresponding to the super-resolution magnification optimization

 

Rumor & Patent: Canon Working On New Tilt-Shift Lenses?

Canon

Canon

Canon

Just recently a rumor about new Canon tilt-shift lenses surfaced. 45mm and 90mm are possible candidates for a replacement. The new tilt-shifts could be announced at the end of 2013 and be released in early 2014.

Egami (translated) spotted a patent that fits well with the rumor above. It is not directly related to lens engineering, it considers a method to change the angle of the grid lines in the EVF and in live view mode depending by the amount of tilt that was set.

  • Patent Publication No. 2013-81129
    • Publication date 2013.5.2
    • Filing date 2011.10.5
  • Shooting assist functions suitable for tilt lens
  • I rotate display grid lines
    • The angle information of the tilt lens to determine the angle of the grid lines
    • To align in the direction of change of focus, the angle of the grating lines, easy to compose the picture

Canon Patent For 400mm f/4 DO Lens

Canon Patent

Canon Patent

Egami (translated) spotted another patent filed by Canon. It is for a 400mm f/4 lens with diffractive optical elements (to reduce flare).

Patent description (machine translated):

  • Patent Publication No. 2013-64858
    • 2013.4.11 Release Date
    • Filing date 2011.9.16
  • Example 1
    • Focal length f = 392.12mm
    • Fno. 4.12
    • Half angle of ω = 3.16 °
    • Image height Y = 21.64mm
    • 262.14mm length lens
    • BF 69.97mm
    • Two fluorite
  • Materials and anomalous partial dispersion DOE to use, reduce the chromatic aberration
  • Refractive power of the diffractive surface
    • Strong, but can reduce the chromatic aberration of the element itself, flare increases
    • The weaker, other optical element DOE play a role
  • Refractive optical unit
    • DOE anomalous partial dispersion and bonding materials
    • DOE aspherical surface on the opposite side of the
  • Vibration control
  • Inner Focus
[via Egami]

Canon Files Patent For New Primes (45mm, 50mm, 60mm)

50mm f/1.4
50mm f/1.2

Egami spotted another patent filed by Canon. The patent refers to s 50 mm F1.4 , 50 mm F1.2 , 45mm F1.6 and 60 mm F1.8 lenses, and describes an apochromatic design that aims to reduce chromatic aberration.

Patent description (machine translated):

  • Patent Publication No. 2013-57802
    • 2013.3.28 Release Date
    • 2011.9.8 filing date
  • Example
    Example
    Focal length Fno. Angle of view Focus
    One 51.7 1.45 45.4 Floating rear focusing +
    Two 51.7 1.45 45.4 Fed whole
    Three 51.7 1.25 45.4 Floating rear focusing +
    Four 51.7 1.25 45.4 Fed whole
    Five 45.0 1.6 51.4 Fed whole
    Six 60.0 1.85 39.7 Fed whole
  • In many large-diameter Gaussian secondary spectrum of axial chromatic aberration
    • This problem occurs when using glass and others with the same Abbe number, a lens that is different partial dispersion ratio
    • When used in a positive lens lanthanum flint glass small partial dispersion ratio
    • When used in a negative lens of flint glass titanium large partial dispersion ratio
  • Canon patent
    • Using a lens with a partial dispersion ratio appropriate correcting the axial chromatic aberration secondary spectrum
    • The concave lens surface adjacent to the aperture, coma aberration correction, the sagittal flare
[via egami]

Patent For New Canon 14mm f/2.8 With Improved Surface Coating

Canon 14mm f/2.8

Canon 14mm f/2.8

Egami (translated) found a patent filed by Canon for a 14mm f/2.8 lens with a new anti-reflective coating, Subwavelength Structure Coating. This method optimizes the refractive index and allows for a thinner anti-reflective film.

Appears as if Canon is working on a successor of the EF 14mm f/2.8L II USM lens (price & specs).

Patent specification (machine translated):

  • Patent Publication No. 2013-47780
    • 2013.3.7 Release Date
    • Filing date 2011.7.26
  • Example
    • F = 14.3mm focal length
    • Half angle ω = 56.6 °
    • Fno. 2.89
    • 14 images in 10 groups lens configuration
  • Canon patent
    • Antireflection film which is excellent in productivity and reflectance characteristics
    • The refractive index of the substrate (original surface of the lens) is 1.65 to 2.20
    • Consists of three layers, the ratio of the refractive index change with a three-layer
    • The third layer
      • Average roughness of less than 400nm pitch structure
      • By continuously varying the ratio of the space-filling structure uneven, changing the refractive index
      • After drying, the film is immersed in hot water and applied to the second layer solution (containing aluminum oxide) by spin coating, plate-like crystals deposited on the surface
    • If spin coating of the wet process, excellent in productivity can be realized a uniform thickness
    • Little change in the characteristics even if there is variation in thickness

 

Canon Patent For New Mount Type (non rotating elements when lens is not mounted)

Canon Patent For New Mount Type
Courtesy: Egami

Egami (translated) spotted an interesting patent filed by Canon. When mounting a lens on a camera body, and holding the lens, the rotating focus or zoom ring can make the operation more difficult. Imagine you have to switch lenses fast, the rotating elements of the lens can slow down the mounting of the lens. The Canon patent is for a new lens mount type that blocks all rotating elements of a lens when the lens is not mounted on a body, hence making mounting the lens easier (and faster). This is achieved by pins on the lens mount that block the rotating members inside the lens barrel. The new mount type is compatible with existing EOS mounts. That means lenses that will feature this new kind of mount can be used with existing EOS bodies.

Patent description (machine translated)

  • Patent Publication No. 2013-37090
    • 2013.2.21 Release Date
    • 2011.8.5 filing date
  • Rotatable operation unit: a rotating member
    • Ring, other zoom ring, focus ring, aperture
  • Canon patent
    • If you remove the lens from the camera, the rotation is restricted
      • Pins are provided on the surface of the lens mount
      • The boss is attached to (inside the lens barrel) end of the pin
      • Inside the lens barrel, the boss is brought into contact with the rotating member
      • Because of the boss, the rotating member is rotated never
    • When mounted on the camera lens, rotatable
      • Pin is provided on the mounting side of the body
        • Etc. F or mount EOS mount, mount a lot of this method
      • Body side pin, and push the pin on the lens, the position of boss will move
      • To the rotating member does not contact the boss, can be rotated