External connection control device for manual iris lens

Abstract

The invention discloses an external connection control device for a manual iris lens. The manual iris lens comprises a lens body and an iris regulating ring which can be rotated relative to the lens body. The external connection control device comprises a fixed clamp hoop, a stepper motor, a pinion, a movable clamp hoop, an outer gear ring and a cable joint, wherein the fixed clamp hoop is fixedly sleeved outside the lens body; the stepper motor is fixed on the clamp hoop; the pinion is arranged on an output shaft of the stepper motor; the movable clamp hoop is fixedly sleeved outside the iris regulating ring; the outer gear ring is fixed on the circumference of the movable clamp hoop and engaged with the pinion; and the cable joint is connected with the stepper motor. The external connection control device can be used for conveniently converting various manual iris lenses into lenses capable of automatically regulating the irises, so that the selection range of camera lenses is enlarged, and the conditions that the sizes of automatic iris lenses are too small and automatic iris lenses with proper specifications are difficult to find are greatly improved; and meanwhile, the external connection control device has the advantages of good generality and precise control.

Description

technical field [0001] The invention relates to the aperture control of a camera or video camera lens, in particular to a device for automatically controlling the aperture of a manual aperture lens. Background technique [0002] The general C-mount fixed-focus lens is equipped with a manual aperture, which requires the user to manually adjust the aperture size and focus, but in the case of automatic monitoring, the user needs to automatically control the change of the lens aperture through the camera. [0003] Generally speaking, in order to automatically control the aperture, the user needs to choose to purchase an automatic aperture lens, and control the change of the aperture through a standard automatic aperture interface. However, the automatic aperture lens has the following disadvantages: [0004] 1. The lens size is small. Due to the addition of an automatic aperture adjustment mechanism, the size of the lens is generally 1 / 3 inch or 1 / 2 inch. In a 2 / 3 inch or larg...

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

[0006] 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.

Images