Canon has filed patent application # 2019-234718 in Japan, which describes a mechanism built into the camera to protect the shutter and image sensor of mirrorless cameras from dust and other debris when the lens is not attached to the camera.
What’s interesting about this mechanism is that it is completely passive, that is, it does not contain an electric motor or solenoid. The mechanism automatically opens when the lens is rotated in the mount during installation, and closes when it is operated in the opposite direction. For this, its design has several levers and springs.
The inventors propose to place the mechanism behind the lens mount, between the electrical contacts and the image sensor. The application does not mention what material the “curtains” will be made of.
Of course, a shutter can be used (and some cameras already use) a shutter to protect the sensor, but the method described in the application has several advantages. For example, unlike a shutter, the protective mechanism operates without power. In addition, it is suitable for cameras that only have an electronic shutter.
Unfortunately, as always in such cases, it is not known whether the idea described in the application will ever be implemented in practice.
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