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Canon patent for augmented Optical Viewfinder (OVF)

canon patent

Another Canon patent for an optical viewfinder able to display all sorts of information. This is not the first patent of this kind, or that refers to viewfinder technology: 1 | 2 | 3

  • Patent publication number 2016 – 191759
    • Release date 2016.11.10
    • Application date 2015.3.31
  • Canon patent
    • Provide the variable reflectance mirror in the optical path of the finder optical system
    • In-screen information display is superimposed and displayed via reflectance variable mirror

canon patent

Excerpt from the patent literature:

[Claim(s)] [Claim 1] In a finder internal display which displays an information display in a screen on an object image in a finder in piles via a variable reflectance mirror,
A camera, wherein the aforementioned variable reflectance mirror has a finder internal display which can change reflectance and transmissivity arbitrarily.
[Claim 2] The camera according to claim 1 provided with a finder which has an optical system which observes an image formed on a focusing plate with a taking lens via an image inversion optical system and an ocular optical system.
[Claim 3] The camera comprising according to claim 2:
A photometry optical system which measures a luminosity of an image formed on the aforementioned focusing plate.
A finder optical system setting up transmissivity and reflectance of the aforementioned variable reflectance mirror from an output of the aforementioned photometry optical system.

[Claim 4] It has an amount setting-out means of information display light in a screen to set a light volume ratio of the aforementioned information display in a screen to an object image in the aforementioned finder, The camera according to claim 3 provided with a finder optical system setting up transmissivity and reflectance of the aforementioned variable reflectance mirror from a preset value of the aforementioned amount setting-out means of information display light in a screen.
[Claim 5] The camera according to claim 2 providing the aforementioned camera with line of sight detection equipment which detects the direction of a look of an observer whom a finder observes, and setting up transmissivity and reflectance of the aforementioned variable reflectance mirror from a result of the aforementioned line of sight detection equipment.

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