Light beam expanding optical structure

An optical structure and beam expansion technology, applied in the field of beam expansion optical structure, can solve the problems of luminous flux loss, limited practical application, large aberration, etc., and achieve the effects of reducing mechanical length, increasing exit pupil, and increasing effective optical path.

Inactive Publication Date: 2019-12-31
平行现实(杭州)科技有限公司
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  • Abstract
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Problems solved by technology

However, it is difficult for a single beam splitter to expand the light into multiple beams of parallel light, and the loss of luminous flux after beam splitting is serious, which greatly limits the practical application
When the semi-transparent and semi-reflective film system is applied to the near-eye optical system, because the near-eye optical system requires optical components to be miniaturized and lightweight, a smaller optical focal length is required to ensure that the total length of the optical components is within 15mm, but the small focal length will cause large aberrations

Method used

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Embodiment Construction

[0018] The present invention will be described in detail below with reference to the accompanying drawings and preferred embodiments, and the purpose and effect of the present invention will become clearer. It should be understood that the specific embodiments described here are only used to explain the present invention and are not intended to limit the present invention.

[0019] Such as figure 1 As shown, for a single microstructure, figure 1 Among them, 1 is the incident beam, 21 is the surface of the first microlens, 22 is the surface of the second microlens, 31 is the first part of the outgoing light, 32 is the second part of the outgoing light, and 41 is the third part of the outgoing light. Both the first microlens surface 21 and the second microlens surface 22 are coated with a film layer with a certain reflectivity. Here, the reflectivity is 0.5, that is, the transmittance is 0.5, and the property of the film system is transflective. The incident light beam 1 is ver...

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Abstract

The invention discloses a light beam expanding optical structure comprising a lens array formed by a plurality of stacked micro lenses and triangular prisms arranged at the two ends of the lens array.Each micro lens has a parallelogram structure; two parallel micro lens surfaces of the micro lens are plated with film layers with the reflectivity being 10% to 90%; and film-plated optical surfacesof each micro lens and the triangular prisms are stacked and glued successively to form the optical structure. On the basis of the optical structure, the light path turning-back is realized and the effective light path of an optical system is increased in limited space, so that the mechanical length of the whole system is reduced.

Description

technical field [0001] The invention relates to the field of near-eye optics, in particular to a light beam expanding optical structure. Background technique [0002] In the process of designing and building the optical path, it is often necessary to expand one beam of light into an optical structure of multiple beams of parallel light, so as to realize the function of adding beams and achieve the purpose of creating a new optical path or expanding the optical path. The core device to solve this optical problem is the beam splitter, which is commonly used in interferometers and is usually composed of a metal film or a dielectric film to realize the semi-reflection function of the beam. However, it is difficult for a single beam splitter to expand the light into multiple beams of parallel light, and the loss of luminous flux after beam splitting is serious, which greatly limits the practical application. When the semi-transparent and semi-reflective film system is applied to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B27/01G02B27/00
CPCG02B27/0081G02B27/0101
Inventor 鲍鹏飞
Owner 平行现实(杭州)科技有限公司
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