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
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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