HTML:
<div name="googleone_share_1" style="position:relative;z-index:5;float: right; /*margin: 70px 0 0 0;*/ top:70px; right:120px; width:0;"><g:plusone size="tall" count="1" href="http://www.canonrumors.com/2012/01/patents-24mm-f2-8-50mm-f1-2-300mm-f4/"></g:plusone></div><div id="fb_share_1" style="float: right; margin: 0 0px 0 10px;"><a name="fb_share" type="box_count" share_url="http://www.canonrumors.com/2012/01/patents-24mm-f2-8-50mm-f1-2-300mm-f4/" href="http://www.facebook.com/sharer.php">Share</a></div><div><script src="http://static.ak.fbcdn.net/connect.php/js/FB.Share" type="text/javascript"></script></div><div class="tweetmeme_button" style="float: right; margin-left: 10px; margin-bottom: 70px;"><a class="tm_button" rel="&style=normal&b=2" href="http://www.canonrumors.com/2012/01/patents-24mm-f2-8-50mm-f1-2-300mm-f4/"></a></div>
<strong>New Optical Formula Patents</strong>
A new patent showcasing 3 different focal lengths has come to light.</p>
<ul>
<li><strong>Patent Publication No. 2012-8352</strong>
<ul>
<li><span><span>2012.1.12 Release Date</span></span></li>
<li><span><span>Filing date 2010.6.25</span></span></li>
</ul>
</li>
<li><strong>Example 1</strong>
<ul>
<li><span><span>Focal length f = 294.0mm</span></span></li>
<li><span><span>Fno = 4.14</span></span></li>
<li><span><span>= 8.42deg angle.</span></span></li>
<li><span><span>15 sheets 11 groups configured</span></span></li>
<li><span><span>One element radial refractive index profile</span></span></li>
<li><span><span>Bowen ratio 0.78</span></span></li>
<li><span><span>Inner</span></span><span><span> Focus (the second lens group for focusing)</span></span></li>
</ul>
</li>
<li><strong>Example 3</strong>
<ul>
<li><span><span>Focal length f = 51.5mm</span></span></li>
<li><span><span>Fno = 1.25</span></span></li>
<li><span><span>= 45.6deg angle.</span></span></li>
<li><span><span>Configuration 6 each group 10</span></span></li>
<li><span><span>Two elements radial refractive index profile</span></span></li>
<li><span><span>One aspherical surface 1</span></span></li>
</ul>
</li>
<li><strong>Example 4</strong>
<ul>
<li><span><span>Focal length f = 24.7mm</span></span></li>
<li><span><span>Fno = 2.86</span></span></li>
<li><span><span>= 82.4deg angle.</span></span></li>
<li><span><span>Configure each group 11 10</span></span></li>
<li><span><span>One element radial refractive index profile</span></span></li>
<li><span><span>Rear focus (the third lens group and the second lens for focusing)</span></span></li>
</ul>
</li>
<li><strong>The principle cause chromatic aberration</strong>
<ul>
<li><span><span>Light is refracted at the interface of the lens</span></span></li>
<li><span><span>Within the lens are not refracted rays</span></span></li>
<li><span><span>The refractive index is different for each wavelength</span></span></li>
</ul>
</li>
<li><strong>Element and the axial refractive-index distribution is</strong>
<ul>
<li><span><span>Refractive index change in the direction of optical axis</span></span></li>
<li><span><span>This patented technology is not used (as introduced)</span></span></li>
</ul>
</li>
<li><strong>Element and the radial refractive index profile is</strong>
<ul>
<li><span><span>Refractive index change in a direction perpendicular to the optical axis</span></span></li>
<li><span><span>Rays are refracted at the boundary and both the lens in the lens (chromatic aberration occurs).</span></span></li>
<li><span><span>Chromatic aberration can be corrected if appropriate refractive index profile</span></span></li>
<li><span><span>Rather than spherical or aspherical, planar (flat glass), but I (easy processing)</span></span></li>
</ul>
</li>
<li><strong>Canon’s patented</strong>
<ul>
<li><span><span>Elements to create a radial refractive index profile optimized for each wavelength the refractive index profile is difficult</span></span></li>
<li><span><span>Patented technology, the characteristics of chromatic dispersion (Abbe number, a partial dispersion ratio) to optimize, to compensate for chromatic aberration</span></span></li>
<li><span><span>Optimize the calculation, line d, line C, line F, to compensate for chromatic aberration of four wavelengths simultaneously in the g-line</span></span></li>
<li><span><span>Create a radial refractive index profile element as a mixture of resin</span></span></li>
</ul>
</li>
</ul>
<p><strong> Source: [<a href="http://egami.blog.so-net.ne.jp/2012-01-16">EG</a>]</strong></p>
<p><strong><span style="color: #ff0000;">c</span>r</strong></p>
