Abstract: An optical lens is described. The optical lens comprises a barrel, a first lens and a second lens. The barrel has a light incident opening, and a receiving space, wherein the receiving space is successive to the light incident opening. Additionally, the first lens is disposed in the receiving space, and the first lens is partially exposed by the light incident opening, wherein the first lens has a first annular conical surface at the outer rim of the first lens. Further, the second lens is disposed in the receiving space, and embedded with the first lens. The second lens has a second annular conical surface on outer rim of the second lens, and the first annular conical surface is embedded with the second annular conical surface. Accordingly, the optical lens has better alignment accuracy and assembly performance.

Abstract: An optical lens is described. The optical lens comprises a barrel, a first lens and a second lens. The barrel has a light incident opening, and a receiving space, wherein the receiving space is successive to the light incident opening. Additionally, the first lens is disposed in the receiving space, and the first lens is partially exposed by the light incident opening, wherein the first lens has a first annular conical surface at the outer rim of the first lens. Further, the second lens is disposed in the receiving space, and embedded with the first lens. The second lens has a second annular conical surface on outer rim of the second lens, and the first annular conical surface is embedded with the second annular conical surface. Accordingly, the optical lens has better alignment accuracy and assembly performance.

Abstract: A prism for a portable optical device is provided. The optical device is used for producing a wide-angle big-size virtual image of a picture from a mini-size high-resolution display and is usually used at an eye relief of only a few centimeters by wearing it on eyes or held closely to eyes with a hand. With the prism of the optical device, a magnified virtual image of the picture on the small display is projected onto a position beyond a distance of distinct vision of the user, so that the user could utilize a mini-size display and other video and audio instruments carried along the user to enjoy a picture on a wide-angle and big-size screen.