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<p><strong>UPDATE
</strong>This is what we’re told this patent actually is.</p>
<p><em>“This is not a focus drive patent, it’s a SPRINGLESS LEAF SHUTER mechanism. EF Leaf shutter lens that will allow a true 1/1000s are on the drawing board, they just can’t make the Cmos do a clear scan and dump faster than 1/250s no matter what they have tried , and HSS make you loose way too much power.”</em></p>
<p><strong>Original Post
</strong>A patent showing a dual motor autofocus for STM lenses has appeared. There is one motor for the STM and a secondary DCM motor. It looks like one motor assists starting the second motor for a faster and smoother operation. The patent information below is Google Translated. If anyone can clarify the patent, please do so in the forum thread associated with this post.</p>
<p><a href="http://www.canonrumors.com/wp-content/uploads/2014/09/newstm.png"><img class="alignnone size-full wp-image-17272" src="http://www.canonrumors.com/wp-content/uploads/2014/09/newstm.png" alt="newstm" width="219" height="426" /></a></p>
<ul style="color: #444444;">
<li><strong><span class="goog-text-highlight">Patent Publication No. 2014-164106</span></strong>
<ul>
<li>Published Date 2014.9.8</li>
<li>Filing date 2013.2.25</li>
</ul>
</li>
<li><strong>Example 1</strong>
<ul>
<li>Moving the aperture one two motors</li>
<li>Main motor STM</li>
<li>Auxiliary motor DCM</li>
<li>And then rotate the first auxiliary motor, to assist the acceleration of the main motor</li>
</ul>
</li>
</ul>
<p>Source: [<a href="http://egami.blog.so-net.ne.jp/2014-09-13" target="_blank">EG</a>]</p>
<p><strong><span style="color: #ff0000;">c</span>r</strong></p>