Focusing device of fixed-focus camera

Abstract

The invention discloses a focusing device of a fixed-focus camera. The focusing device comprises a lens bracket, a lens shield, a lens and a lens retainer, the lens support is provided with a first light-transmitting hole, the lens shield is suitable for being in threaded connection in the first light-transmitting hole, a limiting screw is arranged on the hole wall of the first light-transmitting hole, and the limiting screw is suitable for locking the lens shield; the lens shield is provided with a second light-transmitting hole, a flange is arranged on the hole wall of the second light-transmitting hole, an elastic piece is arranged on the side, away from the lens support, of the flange, and the bottom of the lens is suitable for abutting against the elastic piece; the lens retainer is provided with three adjusting pieces, and the included angle between every two adjacent adjusting pieces is larger than 60 degrees. The adjusting piece is connected with the flange along the optical axis direction of the lens so as to limit the lens between the lens retainer and the flange; the adjusting member can move along the optical axis direction of the lens. According to the focusing device of the fixed-focus camera, the perfect focusing effect can be achieved under the condition that the requirement for the machining precision of structural accessories is not high.

Description

technical field [0001] The invention relates to the technical field of camera focusing, in particular to a focusing device for a fixed-focus camera. Background technique [0002] UAV aerial survey is a powerful supplement to traditional aerial photogrammetry. It has the characteristics of flexible, efficient and fast, precise and accurate, low operating cost, wide application range, short production cycle, etc.; and UAV aerial survey is difficult in small areas and difficult to fly The region has obvious advantages; with the development of UAV and digital camera technology, digital aerial photography technology based on UAV platform has shown its unique advantages. The combination of UAV and aerial photogrammetry makes UAV digital Low-altitude remote sensing has become a new development direction in the field of aerial remote sensing. UAV aerial photography can be widely used in disaster emergency and treatment of major national engineering construction, land supervision, re...

AI Technical Summary

Problems solved by technology

[0005] The biggest disadvantage of the above-mentioned method is that the machining accuracy of the structural accessories is required to be very high, that is, the lens 3 should only move along the optical axis in the lens holder 1, and cannot move away from the optical axis; thus, it will bring production efficiency low, high scrap rate of finished products, high unit price of accessories, poor stability and other issues, which pose a great challenge to the batchability and market acceptance of products

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