Lens assembly for wireless optical communication reception

Abstract

The invention provides a lens assembly used for wireless optical communication receiving. The lens assembly comprises a negative lens assembly, a diaphragm, and a positive lens assembly, which are sequentially arranged; the negative lens assembly comprises at least one negative lens; the positive lens assembly comprises at least one positive lens; the optical axis of the negative lens, the optical axis of the positive lens, and the center of the diaphragm are disposed on the same straight line; when the negative lens assembly comprises one negative lens, the negative lens is used to receive optical signals, and is used to reduce the included angle between the incident light and the optical axis; the diaphragm is used to control the through-put capacities of the optical signals; when the positive lens assembly comprises one positive lens, the positive lens is used to collect the optical signals on a target surface. The lens assembly provided by the invention is advantageous in that the ultra-wide visual field optical receiving can be realized, the high imaging quality can be provided, and the structure is simple.

Description

technical field [0001] The invention relates to the field of optical signal reception, in particular to a lens assembly applied to wireless optical communication reception. Background technique [0002] Most of the indoor wireless optical communication systems work under direct light conditions. When there are people walking in the room or there are obstacles on the direct path, a "shadow" effect will be formed on the receiver, which will affect the communication performance and even cause communication blind spots. Communication cannot continue. The wide-angle optical receiving system with a large field of view can solve this contradiction. Its large field of view can ensure that direct and scattered light signals are received at the same time, thus avoiding the occurrence of "shadow" and "blind spots". At the same time, the indoor wireless optical communication system adopts MIMO technology, which requires the receiver to be able to receive the optical signal sent by the ...

AI Technical Summary

Problems solved by technology

[0004] Angle-diversity array optical reception consists of multiple optical systems with smaller fields of view arranged in a certain spatial order to form an optical array structure and obtain a large field of view coverage capability. The disadvantages are: the structure is more complex and requires high mechanical fixation

However, the fisheye lens itself is designed as an imaging lens. In order to achieve high imaging quality, more than a dozen lenses are usually required to strictly correct the aberration. Therefore, its luminous flux is small and the light transmittance is low. It is contrary to the communication system's requirement for large received energy

In addition, due to the complex structure and high cost of the fisheye lens, it is not suitable for direct use in the actual wireless optical communication system

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