Telephoto type super-large image plane high definition lens and installation method thereof

Abstract

The invention relates to a telephoto type super-large image plane high definition lens and an installation method thereof. The mechanical structure of the lens comprises a main lens barrel, a rear lens barrel and a CCD assembly, which are sequentially disposed on a base plate from left to right. The main lens barrel and the rear lens barrel are connected via a diaphragm stand. An optical system of the lens comprises a front fixed unit A with positive focal power focal, a focusing unit B with negative focal power, a variable diaphragm C and a rear fixed unit D with positive focal power, which are disposed along an optical path in an incident direction from left to right. The front fixed unit A and the focusing unit B are disposed in the main lens barrel, and the rear fixed unit D is disposed in the rear lens barrel. The ratio of the optical overall length of the lens to the system focal length is less than 0.56, and is far smaller than that of a general telephoto type refraction system. The telephoto type super-large image plane high definition lens overcomes the disadvantages that a telephoto type structure has off axis aberration that is difficult to correct and cannot adapt to large target surface imaging. The imaging target surface of the lens reaches 44mm, so the optical information collection capability of the lens is substantially enhances. The lens has the characteristics of large light quantity and high resolution, and can match a high-definition camera.

Description

technical field [0001] The invention relates to a telephoto ultra-large image surface high-definition lens and an installation method thereof, belonging to the field of optoelectronic technology. Background technique [0002] Due to its unique compact structure, telephoto optical system has been widely used in occasions that impose strict geometrical restrictions on the system. However, this system also has inherent disadvantages. For example, the main focal power of the system is concentrated in the front part of the system, which increases the difficulty of correcting axial aberrations such as spherical aberration, chromatic aberration, and especially secondary spectrum; Off-axis aberrations, especially vertical axis chromatic aberration, distortion, etc. severely limit the field of view of telephoto systems, making it difficult to apply in systems with large target surfaces; when a large amount of light is required, the ratio of the total optical length to the focal lengt...

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Problems solved by technology

However, this system also has inherent disadvantages. For example, the main focal power of the system is concentrated in the front part of the system, which increases the difficulty of correcting axial aberrations such as spherical aberration, chromatic aberration, and especially secondary spectrum; Off-axis aberrations, especially vertical axis chromatic aberration, distortion, etc. severely limit the field of view of telephoto systems, making it difficult to apply in systems with large target surfaces; when a large amount of light is required, the ratio of the total optical length to the focal length of the system is also difficult to improve. The ratio of the general telephoto refraction system is about 0.75~0.85; especially when this type of system is required to be adapted to a high-definition camera, the design difficulty is increased

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