Iris diaphragm device

Abstract

The invention relates to an iris diaphragm device, which comprises a body and a case, wherein the case is connected and fixed with the body, the back part of the body is provided with four guide shafts, a first blade and a second blade, a first guide rail and a second guide rail are correspondingly arranged on the first blade and the second blade, the first guide rail and the second guide rail are correspondingly sheathed on the guide shafts and slide along the guide shafts, a rotating hole is formed in the body, a rotating rod is arranged in the rotating hole, a first pulling post and a second pulling post are respectively arranged on the rotating rod, the end parts on the first blade and the second blade are respectively provided with a first guide hole and a second guide hole, and the first pulling post and the second pulling post are correspondingly inserted into the first guide hole and the second guide hole and drive the two blades to oppositely slide, so that the diaphragm size is controlled, a driving post is also arranged on the rotating rod, and the iris diaphragm device also comprises a top rod used for driving the driving post to rotate. The iris diaphragm device has the advantage that on the basis of meeting the same performance, the iris diaphragm device with the advantages that the use is convenient, and the use value of a zoom monitoring security camera is improved can be provided.

Description

【Technical field】 [0001] The invention relates to a variable aperture device. 【Background technique】 [0002] The current optical zoom monitoring security lens, in order to obtain a better picture image, usually uses a variable aperture device to control the size of the light hole of the lens under different magnifications of the lens, thereby controlling the amount of light passing through the lens, so that The imaging of the lens can not only obtain sufficient light intensity, but also avoid the entry of excess light, thereby preventing the glare of the picture. [0003] The variable aperture devices currently in use are all automatically controlled by electronic signals. Before use, the control program must be compiled first, and the compilation of the program must consider many conditions such as the surrounding environment, lens parameters, and chip parameters. Only program engineers who are very experienced in the camera industry can complete this work. Therefore, a...

AI Technical Summary

Problems solved by technology

Therefore, for small and medium-sized monitoring companies, there is another approach, which is to use a fixed aperture device with a suitable aperture to meet the picture effect of some major magnifications, but it cannot cover all magnifications.

Moreover, the automatic control of the variable aperture device must use some special electronic control components, and the cost is relatively high.

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