New Canon Patent Discovered For a Curved Sensor

Egami, the Japanese photography blog has uncovered a new Canon patent for a curved image sensor. According to translated patent literature :

"an optical system which makes an object image image on an imaging surface of the image sensor. A driving means which incurvates an imaging surface of the aforementioned image sensor, a control means which controls the aforementioned driving means and incurvates the aforementioned image sensor so that it may become the curvature according to curvature-of-field aberration and a photographing condition of the aforementioned optical system."

Patent Publication No. 2016-173496

• Published 2016.9.29
• Filing date 2015.3.17
• However, generally a dark current is generated by the image sensor, especially since the time of or during long exposure sensitivity is sometimes noise due to dark current are noticeable, various noise reduction process is performed. On the other hand, the imaging surface imaging element is curved in the imaging element curved dark current generated by the imaging device is known to be reduced by the tensile stress.

Canon patent

• Curving the imaging surface drive means
• Driving means magnetic force

Curvature

• Curvature of dark current noise is reduced
• Curvature priority to the correction of the curvature of field aberration

Canon Patent Improves Detection of Auto Focus Errors

New Canon patent uncovered by Egami aims to enhance Auto-Focus accuracy by improving the detection of errors and reducing 'AF hunting.' The method is in its experimental stage and involves adding polarizing filters in front of the sensor.

Currently, Canon's most advanced AF system is found on the EOS-1D X Mark II camera. Since May, I have taken delivery of the new DSLR and have traveled to global locations, ranging from the Amazon to the high Arctic, testing the new features and functions of this body in real world environment. You can read my review here. Recently, DXOMark also tested the camera and gave it one of its highest ranking.


Patent Publication No. 2016-24391

• Published 2016.2.8
• Filing date 2014.7.23
• Example 1
• Zoom ratio 1.00
• Focal length 293.46
• F-number 2.93
• Half angle of view (degrees) 4.22
• Image height 21.63
• Overall length of the lens 274.0
• BF 59.13
• 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
• Place the linear polarizer between the optical system and the imaging device, and polarization selection means

Canon Files Patent For New Auto-Focus System

A new patent from Canon involving a new type of auto-focus system has been uncovered by Egami, the Japanese photography blog. Canon is a huge conglomerate and is one of the most prolific companies in research and development. Many patents are filed to protect their intellectual properties and may never end up as a marketable product or technology in the end.

Explanation self interpretation of patent literature

• Patent Publication No. 2015-22264
• Published 2015.2.2
• Filing date 2013.7.23 

Canon patent

• Phase difference detection method to be received by the AF sensor can be reflected incident light from the imaging lens
• The phase difference detection by the image plane phase difference AF
• The phase difference detection by external light AF sensor