Patent: Improved Detection of AF Errors

[Canon Rumors]

A patent showing an improved AF accuracy concept has appeared, and <a href="http://www.northlight-images.co.uk/rumours.html">Northlight has shed some light</a> on what it’s all about.</p>
<blockquote>
<p class="p1">It’s a way of improving detection of AF errors without changing the lens focus, as in the ‘hunting’ that Contrast AF does. Uses polarising filters on a plate in front of the pixels. More a concept than practical design here.</p>
</blockquote>
<p class="p1"><a href="http://egami.blog.so-net.ne.jp/2016-07-11">Patent Publication No. 2016-24391</a> (Google Translated)</p>
<ul>
<li class="p1">Published 2016.2.8</li>
<li class="p1">Filing date 2014.7.23</li>
<li class="p1">When placed near squeezed retarder phase difference changes toward the periphery from the center, and a linearly polarized light having a vertical plane of vibration, the focus position of the direct polarized light having a horizontal oscillation plane deviates</li>
<li class="p1">Place the linear polarizer between the optical system and the imaging device, and polarization selection means</li>
</ul>
<p class="p1">We’re still looking for patents to shed some light on Canon’s mirrorless future, especially how they’re going to make EF lenses “native” with a future full frame mirrorless body.</p>
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[CincyFlyer]

"More of a concept ..." shouldn't get a patent. The original idea of a patent - now long forgotten - is to protect an actual implementation of an idea. If it cannot be produced at the time of the patent, the patent shouldn't be granted.

 

[keithcooper]

"More of a concept ..." shouldn't get a patent. The original idea of a patent - now long forgotten - is to protect an actual implementation of an idea. If it cannot be produced at the time of the patent, the patent shouldn't be granted.

That was partly a quote from myself and as much as anything pointing to the machine translated patent info, which is notoriously difficult to read through.

The actual patent may well have detailed implementation examples - my knowledge of Japanese and Japanese patent practices are not that strong...

 

[Fatoldsun]

As almost all my Canon gear has AF problems, this concept would be really welcomed !!