Driving circuit and lens for multiplex control of digital camera (DC) diaphragm and stepping motor diaphragm

Abstract

The invention provides a driving circuit and a lens for multiplex control of a digital camera (DC) diaphragm and a stepping motor diaphragm. The driving circuit comprises a micro control unit, a stepping motor driving unit, a manual driving unit, a multiplexer, an interface unit and a direction control unit, wherein the micro control unit controls a diaphragm to operate in a stepping motor driving or manual driving operating mode; the stepping motor driving unit is connected with the micro control unit and drives a stepping motor to rotate; the manual driving unit is connected with the micro control unit and drives a DC diaphragm pre-selection ring; the multiplexer is connected with the micro control unit and optionally connected with the stepping motor driving unit or the manual driving unit; the interface unit is connected with the multiplexer; the direction control unit is connected with the interface unit and identifies the type of an external connection circuit of the interface unit; and an output end of the direction control unit is connected with the micro control unit. By the invention, the problem about compatibility of driving circuit interfaces of a DC diaphragm control lens and a stepping motor diaphragm control lens is solved, functions of the DC diaphragm control lens and the stepping motor diaphragm control lens are realized, and the addition of interfaces is not required.

Description

technical field [0001] The invention belongs to the technical field of cameras, and relates to a lens driving circuit, in particular to a driving circuit and lens multiplexed by a DC aperture and a stepping motor aperture control. Background technique [0002] The camera lens is the most important part of the camera, because its quality directly affects the quality of the captured image. At the same time, the lens is also one of the most important criteria for classifying camera types and grades. The aperture is a device used to control the amount of light that passes through the lens and enters the photosensitive surface of the camera body, which is usually inside the lens. For the manufactured lens, it is impossible for us to change the diameter of the lens at will, but we can control the amount of light passing through the lens by adding a polygonal or circular grating with a variable area inside the lens. This device is called the aperture. [0003] General C-mount fix...

AI Technical Summary

Problems solved by technology

Because of the need to design an additional circuit, it is impossible for the auto-iris lens to cover all specifications of fixed-focus lenses, making it difficult for users to choose a suitable lens when purchasing

[0007] 3. Inaccurate control

Most of the current popular lenses are DC auto-iris lenses, which are controlled by DC motors. It is impossible or difficult to precisely control the aperture size, and most of them can only control the opening and closing of the aperture.

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