Archive for: patent
A new tilt-shift related patent from Canon
A patent to help usability by changing the grind lines on the EVF or LCD when tilting, shifting and rotating. This is definitely something I could see being useful in a tilt-shift macro.
Patent Publication No. 2013-81129 (Google Translation)
- Publication date 2013.5.2
- Filing date 2011.10.5
Shooting assist functions suitable for tilt lens
- 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
Source: [NL] via [EG]
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Another DO patent
We haven’t seen a new DO lens in a long time, but the patents haven’t stopped. It looks like Canon is continuing the R&D, I’d love to see it go somewhere.
Interpretation and self-description of the patent literature
- 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
Source: [EG] | Canon EF 400 f/4 DO IS
Patent for wide angle fluorite concepts
Canon has filed patent for a wide angle fluorite concept. Such a patent could be part of a new ultra-wide zoom lens, perhaps a 14-24 or a replacement to the 16-35. Egami also thinks it’s possible this patent could be for the EF-M mount. It’s an interesting read, even when Google translated. Read the full patent here.
- Patent Publication No. 2013-37339
- 2013.2.21 Release Date
- Filing date 2011.7.12
- Example 1
- Zoom ratio 1.00
- Focal length f = 1.00mm
- Fno. 2.90
- Half angle of view ω = 56.66 °
- Image height Y = 1.52mm
- 9.51mm length lens
- BF 2.82mm
- 6 aspherical surfaces, the first surface 25
- Punctually
- Example 3
- Zoom ratio 2.06
- 2.06mm – f = 1.00 focal length
- Fno 2.79 -. 4.00
- Half angle of view ω = 51.27 – 32.82 °
- 1.33mm – Y = 1.25 image height
- 8.55mm – 8.79 length lens
- BF 2.41 – 3.46mm
- Aspheric first surface, the fifth surface, the first surface 26
- Positive and negative positive negative
- Example 6
- Zoom ratio 1.00
- Focal length f = 1.00mm
- Fno. 2.90
- Half angle of view ω = 87.35 °
- Image height Y = 21.60mm
- 9.51mm length lens
- BF 2.82mm
- 6 aspherical surfaces, the first surface 25
- Punctually
Source: [EG]
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A patent for APS-C?
Canon has filed a patent to reduce the noise and aliasing in small pixels.
This sort of patent could benefit higher megapixel APS-C cameras, like the EOS 7D Mark II.
Source: [EG]
EOS 7D Body at B&H Photo for $1199
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400mm, 600mm and 800mm DO Lenses
Patents have shown up showing new DO optical formulas with 2:1, 1:1 and 1:4 macro functions.
Adding macro functionality to super telephoto lenses would be a pretty cool feature. It’s also good to see DO patents continue to show up, it’d be nice to see new DO lenses.
Read the patent here
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A new Supertelephoto Zoom?
This is definitely a lens that Tamron would make. If you need length and you’re on a budget, this could be a one of a kind option if and when it comes to market.
Patent Publication No. 2012-208434
- Release Date 2012.10.25
- Filing date 2011.3.30
Example 1
- Focal length f = 152.3068-582.0002mm
- FNo. = 5.12-6.45
- 2ω = 16.30-4.23 ° angle of view
- 18 sheets 13 groups lens configuration
- 5-group configuration of positive and negative positive negative
- Inner Focus (the fourth group focus group)
- Stabilizer (front group of the fifth group of anti-vibration group)
- Reduce the size of the group of anti-vibration and focus group
- To shorten the focal length of the front group of the fifth group, reduce the amount of movement of the time the anti-vibration
- Joining the front group lens and the fifth group, when the spherical aberration correction of the anti-vibration, axial chromatic aberration and chromatic aberration of magnification
Source: [EG]
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New Coating
Below seems to be a patent for large protruding front elements, that will help with issues of reflection and cleaning. This could possibly appear in the much talked about EF 14-24 f/2.8L.
Patent Publication No. 2012-159723
- 2012.8.23 Release Date
- 2011.2.1 filing date
Example 1
- F = 14.3mm focal length
- Fno. = 2.89
- Half angle ω = 56.6 °
- 14 images in 10 groups lens configuration
- Existing coating roughness
- Will making cleaning the front element easier and possibly less destructive
Canon patent
- (Coating applied to one surface of a lens) thin film layer
- Having a plurality of tubular spaces are arranged parallel to the tube
- Maximum opening diameter of the tubular space below 400nm
- The inorganic oxide materials (silica, titania)
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More Patents
A couple of new lens formula patents which seems to address lowering chromatic aberrations in a new way
Patent Publication No. 2012-163746
- 2012.8.30 Release Date
- 2011.2.7 filing date
Example 4
- Zoom ratio 4.67
- 56.11 – - 131.85mm f = 28.21 focal length
- Fno 4.12 -. 4.89 – 5.77
- Half angle of view ω = 37.48 – 21.09 – 9.32deg.
- Image height 21.64mm
- 242.67 – - 266.43mm 224.00 overall length of the lens
- BF 55.79 – 70.40 – 82.95mm
- 20 sheets of 14 group lens configuration
- Two two-sided aspherical
- Three low-dispersion glass
- Four Super UD glass
- 102.40mm effective diameter of the first surface
- 5-group zoom negative positive negative
Example 5
- Zoom ratio 10.31
- 93.64 – - 307.06mm f = 29.77 focal length
- Fno 3.31 -. 4.71 – 5.85
- Half angle of view ω = 36.00 – 13.01 – 4.03deg.
- Image height 21.64mm
- 263.66 – - 304.01mm 209.34 overall length of the lens
- BF 61.72 – 89.40 – 106.84mm
- 18 sheets 12 groups lens configuration
- Three 3 aspherical surface
- Three low-dispersion glass
- 2 UD glass sheets
- 84.36mm effective diameter of the first surface
- 5-group zoom negative positive negative
- In the zoom lens of the positive lead type, reducing the chromatic aberration of magnification of the secondary
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New Patent
Canon has filed a patent for the optical formula of a new EF 300 f/4L IS II.
Patent Publication No. 2012-159726
- 2012.8.23 Release Date
- 2011.2.1 filing date
Example 3
- F = 300mm focal length
- Fno. 4.0
- Tele ratio 0.68
- Inner Focus
- φr = 68.8mm
- φg1 = 67.8mm
- φg2 = 70.2mm
Technical background
- When the miniaturization of the optical system, longitudinal chromatic aberration, chromatic aberration of magnification is remarkable
- As the focal length becomes longer, the telephoto lens system, chromatic aberration is noticeable
- There is a method of correcting the aberrations of a material having an anomalous dispersion resin, the resin is difficult to produce high-precision thick
- There is a method of sandwiching a thin glass resin material, the bonding peeling distortion problem bonding at high temperature
Canon patent
- Joining three or more optical elements
- The outer diameter of the resin is increased to reduce the distortion at the time of bonding
- Not adhere to each other resin outer glass element
- Between the optical element of the outside is gone, adhesive, the thickness of the adhesive distribution occurs
- Using a sealing agent to prevent change in shape of the resin and the refractive index change due to moisture absorption
- Do the black outer peripheral portion of the glass element
- Prevent flare and ghosting resin at the outer periphery
- Surface resin glue is not good
Source: [EG]
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You want IS?
A patent for an EF 24-70 f/2.8L IS has surfaced finally, this has been a lens that has been talked about and desired for a long time.
We mentioned some time back that there were 5 or 6 version of the new 24-70, and one of them had IS. Canon decided against an IS version for reasons to do with weight, size and cost from what I’m told.
Sadly for the ones that want an IS version of this lens, I have little faith that such a lens will be coming any time soon. Patents can sometimes appear after a product has been announced, and that’s probably what has happened here.
Canon EF 24-70 f/2.8L IS
Patent Publication No. 2012-123156
- 2012.6.28 Release Date
- 2010.12.8 filing date
Example 1
- Zoom ratio 2.46
- 68.99mm – f = 28.00 focal length
- Fno. 2.88
- 17.41 deg – 37.69 half angle of view.
- Image height 21.64mm
- 222.38mm – 192.25 full-length lens
- BF 39.98 – 53.68
- Effective diameter 74.47mm ball before
- Effective diameter aperture 31.23mm
- 19 sheets 12 group lens configuration
- Three three aspherical surface
- 2 UD glass sheet
Example 2
- Zoom ratio 2.86
- 68.70 – f = 24.00 focal length
- Fno. 2.88
- 17.48 deg – 42.03 half angle of view.
- Image height 21.64mm
- 224.86mm – 191.93 full-length lens
- BF 39.85 – 55.68mm
- Effective diameter 77.29mm ball before
- Effective diameter aperture 32.58mm
- Lens Construction 12 group 21 sheets
- Three three aspherical surface
- 2 UD glass sheet
- Five-group zoom positive and negative positive positive and negative
- (For Focusing group 2) Inner Focus
- (Part 1 of the fourth lens group, anti-vibration unit is L4a) image stabilization
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