Below is another patent for a multi-layer related sensor patent from Canon has come to light. This is the third one that has appeared in the last month or so.
Keith over at Northlight breaks it down in a way that’s easy to understand. “The issue addressed, is light of the ‘wrong’ colour being reflected from one layer into another, which reduces the ability of different layers to respond to photons of only a particular range of colours. This has the potential to greatly improve the colour accuracy and fidelity of such stacked sensor designs.”
Patent Publication No. 2014-130890 (Google Translated)
- Publication date 2014.7.10
- Filing date 2012.12.28
- Multilayer sensor drawback of
- G is light, the image quality is degraded and reflected by the surface of the layer between the G and B layer, re-enters the B layer
- Canon patents
- The provision of the dielectric film and the insulating film as an anti-reflection film
- First insulating layer, B layer, a dielectric film, insulating film, dielectric film, G layer, a dielectric film, insulating film, insulating film, dielectric film, the R layer
- By increasing the thickness of the dielectric film, to suppress the multiple reflection
- The dielectric film is between the G layer and B layer, the reflectance with respect to G is lower than B
Source: [EG] via [NL]
We’re told that Canon is working to implement depth of field control in upcoming PowerShot and Rebel DSLRs. The idea sounds like what Lytro is doing, or more recently what Google introduced for the Android camera.
There’s no mention of which camera(s) this would be introduced in, but it seems like a logical next step feature.
We’re told by a new source that a new generation of full-frame CMOS sensors slated for both a forthcoming mirrorless camera as well as updated versions of the current range of prosumer DLSR models.
The new full frame sensors are said to have lower production costs. Yields have improved for these sensors when compared to their predecessors, and that has probably lead to the cost reduction in production. There was also a bit of information about the new sensors having Foveon like technology, we’ve asked for clarification on this.
New source, so a big grain of salt for this one is required.
Canon still working on Foveon Technology
Canon has been working on 3 layer Foveon sensor technology for a while now, it still hasn’t appeared in a camera and we haven’t heard anything to say it will. However, the fact they continue to spend resources on it, tells us there is definitely a good application for the technology.
Patent Publication No. 2013-93553 (Google Translated)
- Publication date 2013.5.16
- Filing date 2011.10.4
Imaging element of three-layer structure
- Photodiode deep layer (hereinafter, PD) in the charge is diffused into the substrate
- Thus sensitivity is poor red
- I as a photonic crystal of irregular shape, the boundary surface of the PD of red or green,
- In the periodic structure of uneven spacing, less than twice the 1/4 times or more the wavelength of light, or I shall be two times or less 1/2 times or more
- Irregular shape has the properties to be spatially-localized or resonant light
- The incident light is diffracted, it combines with the light of the boundary plane, the resonant
- Prolonged exists than normal, the light becomes easy to be absorbed by the PD Thus
TOKYO, March 4, 2013—Canon Inc. announced today that the company has successfully developed a high-sensitivity 35 mm full-frame CMOS sensor exclusively for video recording. Delivering high-sensitivity, low-noise imaging performance, the new Canon 35 mm CMOS sensor*1 enables the capture of Full HD video even in exceptionally low-light environments.
The newly developed CMOS sensor features pixels measuring 19 microns square in size, which is more than 7.5-times the surface area of the pixels on the CMOS sensor incorporated in Canon’s top-of-the-line EOS-1D X and other digital SLR cameras. In addition, the sensor’s pixels and readout circuitry employ new technologies that reduce noise, which tends to increase as pixel size increases. Thanks to these technologies, the sensor facilitates the shooting of clearly visible video images even in dimly lit environments with as little as 0.03 lux of illumination, or approximately the brightness of a crescent moon—a level of brightness in which it is difficult for the naked eye to perceive objects. When recording video of astral bodies, while an electron-multiplying CCD,*2 which realizes approximately the same level of perception as the naked eye, can capture magnitude-6 stars, Canon’s newly developed CMOS sensor is capable of recording faint stars with a magnitude of 8.5 and above.*3
Using a prototype camera employing the newly developed sensor, Canon successfully captured a wide range of test video,*4 such as footage recorded in a room illuminated only by the light from burning incense sticks (approximately 0.05–0.01 lux) and video of the Geminid meteor shower. The company is looking to such future applications for the new sensor as astronomical and natural observation, support for medical research, and use in surveillance and security equipment. Through the further development of innovative CMOS sensors, Canon aims to expand the world of new imaging expression.
Canon Marketing Japan Inc. will be exhibiting a prototype camera that incorporates the newly developed 35 mm full-frame CMOS sensor and sample footage captured with the camera at SECURITY SHOW 2013, which will be held from Tuesday, March 5, to Friday, March 8, at the Tokyo International Exhibition Center in Tokyo, Japan.
- An imaging element (aspect ratio: 16:9) that supports the largest image circle size possible when shooting with a Canon EF lens.
- A CCD sensor with a readout mechanism that multiplies electrons after being converted from light. Applications include nighttime surveillance and the capture of astral bodies and nighttime nature scenes.
- The brightness of a star decreases 2.5-times with each 1 magnitude increase.
- Recording of test video footage was made possible through cooperation from ZERO Corporation.