An underwater wide-angle lens imaging system

Abstract

The present invention provides an underwater wide-angle lens imaging system, which includes a first lens group, a diaphragm and a second lens group in sequence from the object side to the imaging side; the first lens group includes a a first lens with a negative power and a plane facing the object side and a concave surface facing the stop, a second lens having a negative power and a concave surface facing the stop, a third lens having a negative power; the The second lens group includes a fourth lens with positive refractive power and a fifth lens with positive refractive power from the imaging side to the diaphragm; the fifth lens is a biconvex lens. Through the limitation of the first lens and the fifth lens, as well as the reasonable focal power distribution of other lenses, when using the first lens with one end as a flat surface as a waterproof cover, the lens can achieve a field of view angle of more than 140° underwater, and at the same time Realize high-definition imaging in the temperature range of 0°C to 85°C.

Description

technical field [0001] The invention relates to the technical field of cameras, in particular to an underwater wide-angle lens imaging system. Background technique [0002] With the continuous development of science and technology, the field of photography has been continuously expanded. In the field of measurement or consumption, motion cameras, unmanned aircraft, and unmanned ships have gradually entered the public eye. In recent years, underwater photography has also received more and more attention, and equipment dedicated to underwater photography, such as underwater drones, has also begun to emerge. [0003] At present, there are few lenses specially used for underwater photography on the market. Most terminal companies use the lens used in the air to install it on the underwater camera equipment, and cover the lens with a spherical or flat waterproof cover. During the underwater movement of the camera equipment, the spherical cover is convex and is easily scratched b...

AI Technical Summary

Problems solved by technology

During the underwater movement of the camera equipment, the spherical cover is raised and is easily scratched by suspended objects in the water. Therefore, equipment companies often prefer to use flat covers

However, there are obvious disadvantages in the current combination of the plane cover and the lens used in the air: ①Since the medium on the object side changes from air to water, the medium between the plane cover and the lens is air, and we know that light changes from optically dense water to optically sparse When the air propagates, full emission will occur. Due to the limitation of the critical angle, the maximum full field of view in water can only reach about 97.5°; 50% of the field of view will become very large, so it is difficult to obtain good imaging effects outside the axis; ③When shooting underwater, the camera module will also heat up, causing the lens to go out of focus

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