A kind of Fresnel lens and virtual reality device
A Fresnel lens and base surface technology, applied in the field of virtual reality imaging optics, can solve the problems of large VR lens size and unfavorable thinning of VR equipment
Active Publication Date: 2019-03-26
SUPERD CO LTD
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Problems solved by technology
[0006] The invention provides a Fresnel lens and a virtual reality device, which are used to solve the problem in the prior art that when the VR lens ensures a large viewing angle, the size of the VR lens is relatively large, which is not conducive to the thinning and thinning of VR equipment
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[0030] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention clearer, the preferred embodiments of the present invention will be described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described here are only used to illustrate and explain the present invention. Invention is not intended to limit the present invention. And in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.
[0031] In order to ensure the quality of the image, the focal length of the optical lens used in the virtual reality device should not be too small, generally greater than 35mm, and the thickness of the lens is also very thick, about 10-20mm. The vertical size is still relatively large, and the excessive volume brings a very bad user experience. In order to improve user experience, miniaturizatio...
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The invention discloses a Fresnel lens and a virtual reality device, and aims to reduce the size of a Fresnel lens on premise that a short focus is met. The Fresnel lens disclosed by the invention comprises a base surface and a Fresnel surface, wherein the base surface is covered with the Fresnel surface; a plurality of sequentially connected sawtooth concentric rings are arranged on the Fresnel surface; the focal length of the Fresnel surface is greater than 30mm, so that the focal length of the Fresnel lens is smaller than 30mm. As the focal length of the Fresnel surface is greater than 30mm, the focal length of the base surface can be reduced as much as possible, that is, the focal power of the base surface can be improved, and furthermore the overall focal length of the Fresnel lens can be reduced to be within 30mm. As the Fresnel surface can be still very thin in case of the short focus, the overall thickness of the Fresnel lens can be reduced, and the purposes that the Fresnel lens has a short focus and a small size simultaneously can be achieved. On the basis, the Fresnel lens can be used in the virtual reality device, and the purposes of lightening and thinning the virtual reality device can be achieved.
Description
technical field [0001] Embodiments of the present invention relate to the technical field of virtual reality imaging optics, in particular to a Fresnel lens and a virtual reality device. Background technique [0002] In recent years, virtual reality (Virtual Reality, referred to as VR) technology is a computer-generated information interaction based on a visual virtual environment with a certain sense of immersion. , so that a stereoscopic image can be seen. [0003] The principle of VR equipment is to pull the near image generated by the display to the distance through the optical system to enlarge it, almost filling the human field of vision, thereby creating a sense of immersion. Since the field of view of the human eye is very wide, in order to ensure a sufficient viewing angle, it can be known from y=f*tan(w / 2) (where y is the object height, w is the viewing angle, and f is the focal length) that at the object height y (screen size) remains unchanged, the combined foc...
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IPC IPC(8): G02B3/08G02B27/01
CPCG02B3/08G02B27/0172
Inventor 陈贵喜左惟涵郭福忠宋磊
Owner SUPERD CO LTD