FOCUS ADJUSTMENT DEVICE, IMAGE FORMING DEVICE AND LENS Russian patent published in 2021 - IPC G02B7/28 G02B7/38 G03B13/36 H04N5/232 

FIELD: optical systems.

SUBSTANCE: replaceable lens is attached to a camera case, and it contains an optical system containing a focus adjustment lens, a drive for its movement, a detection unit for detecting the position of the focus adjustment lens, and a transmitter made with the possibility to transmit the first value and the second value. The first value changes in accordance with the position of the focus adjustment lens, and it is a coefficient of movement of an image plane corresponding to the amount of movement of the image plane relatively to the amount of movement of the focus adjustment lens at the position of the focus adjustment lens. The second value is the coefficient of movement of the image plane, while the amount of movement of the image plane relatively to the amount of movement of the focus adjustment lens becomes minimal in the range of movement of the focus adjustment lens. The transmitter transmits the first value after receiving the first signal from the camera case and transmits the second value after receiving the second signal.

EFFECT: technical result is the provision of tracking the state of the focus adjustment of the optical system.

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