Zhejiang Sunny Optical Co., Ltd

Zhejiang Sunny Optics Co., Ltd.

Yinfang Jin

Litong Song

Fujian Dai

Lingwei Chen

Qing Zhao

The present disclosure provides a TO-CAN cap. The TO-CAN cap includes a casing, the casing has a hollow cylindrical structure, and an inner wall of the casing has a protrusion portion at a first end portion in an axial direction of the casing; and an optical lens, the optical lens has an optical portion for refracting light and a rib portion at a periphery of the optical portion, a side surface of the rib portion having a concave portion complementary to the protrusion portion, where the casing and the optical lens are connected to each other through the protrusion portion and the concave portion.

TO-CAN cap

The present disclosure provides an ocular assembly. The ocular assembly including sequentially along an optical axis from an object side to an image side: a first lens with a positive refractive power has a convex object-side surface, and a second lens has a concave image-side surface, wherein at least one of the object-side surface of the first lens, an image-side surface of the first lens, an object-side surface of the second lens, and an image-side surface of the second lens is a Fresnel structure surface, wherein half of a maximal field-of-view HFOV of the ocular assembly satisfies: HFOV&#x3e;40&#xb0;, an axial distance TTL of the object-side surface of the first lens to the image plane and a total effective focal length f of the ocular assembly satisfy 1&#x3c;TTL/f&#x3c;1.5.

Oculars and display devices including the same

The present invention provides an eyepiece. The eyepiece is composed of one lens, which comprises a first surface and a second surface that are opposite, wherein, the first surface is a curved surface, and the second surface is a Fresnel structure surface; the Fresnel structure surface is formed by a plurality of annular zones that are sequentially arranged, to form a sawtooth surface, and each of the annular zones is formed by a working surface and a non-working surface, the working surface is an aspheric surface, and the non-working surface is a straight bevel; and the eyepiece satisfies the following conditional expression: 85&#xb0;&#x3c;FOV&#x3c;130&#xb0;, and 0&#xb0;&#x2264;&#x3b8;i&#x2264;5&#xb0;; wherein, FOV is a maximum angle of view of the eyepiece, and &#x3b8;i is the angle between the non-working surface of the ith annular zone and the optical axis.

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Ningbo, China

Yinfang Jin