Egami (translated) spotted another patent filed by Canon, this time for a ring flash with a prism for an uniform distribution of the light.

• Patent Publication No. 2014-13350
  • Publication date 2014.1.23
  • Filing date 2012.7.5
• Existing ring strobe
  • Xenon tube
  • Process to bend the arc shaped glass tube cylindrical difficult
• Canon patents
  • There are two areas in light of the strobe
  • Light flux from the first region is subject to direct
  • Toward the object light beam from the second zone enters the prism, and then reflected inside
  • Provided with a step stepped on the reflecting surface, by changing the pitch of the step, it is possible to adjust the distance between the emission point

More after the break.

Egami (translated) spotted another patent filed by Canon (we had more Canon patents lately: 1 | 2 | 3).

The patent refers to the implementation of a curved diaphragm. I guess this could be very useful for miniaturization purposes. Is there another super-small DSLR like the Rebel Sl1 (price & specs) coming?

• Patent Publication No. 2014-13363,2014-13365
  • Publication date 2014.1.23
  • Filing date 2012.6.6
• Canon patents
  • The iris of the dome-shaped

Egami (translated) spotted a patent filed by Canon for an 11-24mm f/4 wide-angle lens for full-frame sensors.

• Patent Publication No. 2014-10286
  • Publication date 2014.1.20
  • Filing date 2012.6.29
• Example 1
  • Zoom ratio 2.06
  • Focal length f = 11.30-18.00-23.30mm
  • Fno. 4.10
  • Half angle ω = 62.42-50.24-42.88mm
  • Image height Y = 21.64mm
  • 172.19-161.28-162.86mm overall length of the lens
  • BF 38.82-52.31-63.15mm

Egami (translated) spotted more patents filed by Canon. This time for image stabilized 85mm f/1.8, 100mm f/2, and 135mm f/2.8 lenses.

• Patent Publication No. 2014-10283
  • Publication date 2014.1.20
  • Filing date 2012.6.29
• Example 1
  • Focal length f = 85.56mm
  • Fno. 1.86
  • Angle of view 2ω = 28.4 °
  • Image height Y = 21.635mm
• Example 2
  • Focal length f = 102.06mm
  • Fno. 2.00
  • Angle of view 2ω = 23.9 °
  • Image height Y = 21.635mm
• Example 3
  • Focal length f = 131.00mm
  • Fno. 2.80
  • Angle of view 2ω = 18.8 °
  • Image height Y = 21.635mm
• Canon patents
  • Positive and negative positive
  • Inner Focus (group 2)
  • (Part of the third group) anti vibration

Source: Egami (translated)

Canon filed a patent for automatic auto-focus microadjustement of lenses. Pretty cool feature that I would like to see on my DSLRs.

Patent description:

• Patent Publication No. 2013-254194
  • Publication date 2013.12.19
  • Filing date 2012.5.11
• Issues surrounding the AF adjustment
  • The looseness of the phase difference AF sensor, because the AF accuracy is worse, need AF adjustment
  • It is not done correctly the AF adjustment in your environment
  • Necessary facilities such as service center
• Canon patents
  • Automation of the AF adjustment
  • Procedure
    • Let me be the difference adjusted value of the phase difference AF and contrast AF
    • To determine the reliability