Canon patent for curved sensor design (to suppress vignetting)

canon patent

Canon’s labs working on a curved sensor design? At least a new patent suggests it.

The patent refers to a curved sensor design with should suppress vignetting artefacts to a large degree.

  • Patent publication number 2016 – 197663
    • Release date 2016.11.24
    • Application date 2015.4.3
  • Canon¬†patent
    • Make the central part flat in shape where light falloff is not noticeable
    • The surrounding portion where the drop in light quantity is conspicuous is defined as a curved shape

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Excerpt from the patent literature:

[Claim(s)] [Claim 1] It has an imaging surface which carries out light reception of the light from an object imaged with a lens,
An image sensor, wherein the aforementioned imaging surface has a flat shape part and a curved shape section.
[Claim 2] The image sensor according to claim 1 having made a central part of the aforementioned imaging surface into a flat shape part, and making a periphery of the aforementioned imaging surface into the aforementioned curved shape section.
[Claim 3] The image sensor according to claim 2, wherein a position of a boundary between said flat shape part and the aforementioned curved shape section is set as the same distance to one reference point on the aforementioned imaging surface.
[Claim 4] The image sensor according to claim 3, wherein the aforementioned imaging surface has a picture element region where a unit pixel is arranged at matrix form.
[Claim 5] The image sensor according to claim 4 which is provided with the following and characterized by the aforementioned valid pixel area comprising said flat shape part and an aforementioned curved shape section.
A valid pixel area which outputs a signal [ picture element region / aforementioned ] according to light income.
A black reference picture element region which outputs a black reference signal.

[Claim 6] The image sensor according to claim 5, wherein the aforementioned reference point is placed at the center of the aforementioned valid pixel area.
[Claim 7] The aforementioned black reference picture element region adjoins the aforementioned valid pixel area, and is arranged, and, in the aforementioned black reference picture element region, the part or whole serves as a curved shape section, The image sensor according to claim 5 or 6, wherein curvature of a curved shape section of the aforementioned black reference picture element region differs from curvature of a curved shape section of the aforementioned valid pixel area.
[Claim 8] The image sensor according to claim 7, wherein curvature of a curved shape section of the aforementioned black reference picture element region is smaller than curvature of a curved shape section of the aforementioned valid pixel area.
[Claim 9] An image sensor of a description in any 1 item of Claims 5-8, wherein the aforementioned black reference picture element region comprises a shaded unit pixel provided with a photoelectric conversion part.
[Claim 10] An image sensor of a description in any 1 item of Claims 5-8, wherein the aforementioned black reference picture element region comprises a unit pixel without a photoelectric conversion part.
[Claim 11] An image sensor of a description in any 1 item of Claims 1-10,
The aforementioned lens,
An imaging device characterized by preparation ******.
[Claim 12] The imaging device according to claim 11, wherein the aforementioned reference point is placed on an optic axis of the aforementioned lens.

[via Egami]
  • animalsbybarry

    Canon has yet to build FF mirrorless cameras.
    A problem unique to mirrorless is that the short lens to film distance results in greater angle of incidence than SLR’S.
    Some sort of curved desighn sensor may be highly advantageous to FF mirrorless particularly the flat center desighn
    Since lenses have not yet been desighned for thier new system the may be working on a new series of highlyptoprietary lenses.

    I find the fact that interchangeable lens systems are so proprietary to be highly objectionable and believe this is contributing to the decline of the ILC industry.

    For example… I like the Sony E mount cameras currently being made…but not a single supertelephoto lens is available in native E mount, and not a single adapted supertelephoto lens works well.

    I do not want to buy SLR cameras by Nikon or Canon but cannot shoot wildlife without Canikon mount lenses.

    I firmly believe as a consumer we deserve a universal lensmount
    I want to choose the best available product, not the best available product that is compatable with my system.

    I am sick and tired of buying stuff I do not want and prematurely stop using just because camera companies want to screw us by only making proprietary products that lock us into thier own system.

    Thanks to new and easier alteenatives, such as cellphones, the I LC camera market is in a state of free fall decline, while cellphone camera sales are skyrocketing

    I cannot think of any industry that deserves to fail more than the camera industry

    So while part of me wants the newest best cameras and lenses…another part of me would like to see the camera market totally fail as they deserve

    • szielinski

      I’m sure Canon would not mind if the EF joined the PL mount as the industry standard.

      • animalsbybarry

        As the first and best established FF mirrorless mount E mount is the most obvious choice for a universal mount
        And Sony has opened the E mount system
        I expect Canon however will continue thier proprietary route and continue the loss of sales they deserve for it
        Yes the entire industry is declining. Perhaps Nikon and Sony might wisely decide to all use E mount to better compete against Canon
        I am unfortunately not expecting the industry to adapt a single standard….but I am sure if consumers were allowed to vote they would overwhelmingly vote yes.

        New Achromatic Metastructure ( flat lens ) technology is finally ready for market and as this article describes they have “applied for patents and are actively seeking commercial opportunities”

        http://www.opli.net/opli_magazine/eo/2016/metalens-works-in-the-visible-spectrum-sees-smaller-than-a-wavelength-of-light-june-news?spot_im_comment_id=sp_AZk7b0Kj_11474_c_ZpH9Kx

        If , as many expect, this tech will revolutionize the lens industry it may level the playing field for Canon vs everyone else

        So I would still like to see the ILC industry transformed into a more consumer friendly industry where interchangeable lenses are actually interchangeable

        While there is still an ILC industry to transform…. otherwise they totally deserve to fail