An ultra-wide angle eyepiece

Abstract

The utility model discloses a kind of super wide-angle eyepieces, in turn are provided with eyepiece first lens, eyepiece second lens, eyepiece third lens, eyepiece fourth lens, eyepiece fifth lens, eyepiece sixth lens along optical axis direction;Eyepiece first lens and eyepiece second lens constitute cemented lens, eyepiece first lens is double-concave lens, eyepiece second lens is double-convex lens, eyepiece third lens is double-convex lens, eyepiece fourth lens is concave-convex lens, convex surface is towards object side, eyepiece fifth lens and eyepiece sixth lens constitute cemented lens, eyepiece fifth lens is double-concave lens, eyepiece sixth lens is double-convex lens, the focal length of eyepiece is 28mm, exit pupil distance is 15mm, field angle is 82 °.

Description

Technical Field

[0001] This utility model belongs to the field of lens manufacturing and processing technology, and specifically relates to an ultra-wide-angle eyepiece. Background Technology

[0002] As is well known, an astronomical telescope consists of an objective lens and an eyepiece. The objective lens and eyepiece are made into interchangeable standard components. By combining different objective lens groups and eyepiece groups, astronomical telescopes with different magnifications can be constructed to meet different observation purposes. The apparent magnification of an astronomical telescope is equal to the ratio of the focal lengths of the objective lens group and the eyepiece group. The object-side field of view of the entire telescope is equal to the image-side field of view of the eyepiece divided by the apparent magnification of the telescope. Currently, most ultra-wide-angle eyepieces on the market are not ideal. Utility Model Content

[0003] The purpose of this invention is to provide an ultra-wide-angle eyepiece for existing devices, in order to solve the problems mentioned in the background art.

[0004] To solve the above-mentioned technical problems, this utility model provides the following technical solution: an ultra-wide-angle eyepiece, wherein an eyepiece first lens, an eyepiece second lens, an eyepiece third lens, an eyepiece fourth lens, an eyepiece fifth lens, and an eyepiece sixth lens are arranged sequentially along the optical axis. The first and second eyepiece lenses form a cemented lens. The first eyepiece lens is a biconcave lens, the second eyepiece lens is a biconvex lens, the third eyepiece lens is a biconvex lens, and the fourth eyepiece lens is a concave-convex lens with the convex surface facing the object side. The fifth and sixth eyepiece lenses form a cemented lens. The fifth eyepiece lens is a biconcave lens, and the sixth eyepiece lens is a biconvex lens.

[0005] Preferably, the center thickness of the first eyepiece lens along the optical axis is 1.8 mm, the center thickness of the second eyepiece lens is 4.2 mm, the center thickness of the third eyepiece lens is 2.3 mm, the center thickness of the fourth eyepiece lens is 2.6 mm, the center thickness of the fifth eyepiece lens is 1.6 mm, and the center thickness of the sixth eyepiece lens is 2.4 mm.

[0006] Preferably, the distance between the second and third eyepiece lenses along the optical axis is 0.3 mm, the distance between the third and fourth eyepiece lenses is 0.3 mm, and the distance between the fourth and fifth eyepiece lenses is 13.8 mm.

[0007] Compared with the prior art, the beneficial effects achieved by this utility model are: the focal length of the eyepiece is 28mm, the exit pupil distance is 15mm, the field of view is 82°, the glass structure uses 6 pieces in 4 groups, and the socket size is 2 inches. Attached Figure Description

[0008] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the structure of this utility model. Detailed Implementation

[0009] The following detailed, non-limiting description of the present invention, in conjunction with preferred embodiments and accompanying drawings, is provided. Obviously, the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0010] like Figure 1 As shown, an ultra-wide-angle eyepiece has a first eyepiece lens 1, a second eyepiece lens 2, a third eyepiece lens 3, a fourth eyepiece lens 4, a fifth eyepiece lens 5, and a sixth eyepiece lens 6 arranged sequentially along the optical axis. Eyepiece 1 and eyepiece 2 form a cemented lens. Eyepiece 1 is a biconcave lens, eyepiece 2 is a biconvex lens, eyepiece 3 is a biconvex lens, and eyepiece 4 is a concave-convex lens with the convex surface facing the object side. Eyepiece 5 and eyepiece 6 form a cemented lens. Eyepiece 5 is a biconcave lens, and eyepiece 6 is a biconvex lens. Along the optical axis, the center thickness of eyepiece 1 is 1.8 mm, the center thickness of eyepiece 2 is 4.2 mm, the center thickness of eyepiece 3 is 2.3 mm, the center thickness of eyepiece 4 is 2.6 mm, and the center thickness of eyepiece 5 is... The optical magnification is 1.6mm, the center thickness of the sixth eyepiece lens 6 is 2.4mm, the distance between the second eyepiece lens 2 and the third eyepiece lens 3 along the optical axis is 0.3mm, the distance between the third eyepiece lens 3 and the fourth eyepiece lens 4 is 0.3mm, the distance between the fourth eyepiece lens 4 and the fifth eyepiece lens 5 is 13.8mm, the focal length of the eyepiece is 28mm, the exit pupil distance is 15mm, the field of view is 82°, the glass structure uses 6 elements in 4 groups, the socket size is 2 inches, and two sets of cemented lenses are used to effectively shorten the optical length of the entire eyepiece. By using the combination of the first eyepiece lens 1 and the second eyepiece lens 2, the requirement of low distortion at high magnification can be met.

[0011] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0012] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. An ultra-wide-angle eyepiece, wherein a first eyepiece lens (1), a second eyepiece lens (2), a third eyepiece lens (3), a fourth eyepiece lens (4), a fifth eyepiece lens (5), and a sixth eyepiece lens (6) are arranged sequentially along the optical axis. The first eyepiece lens (1) and the second eyepiece lens (2) form a cemented lens. The first eyepiece lens (1) is a biconcave lens, the second eyepiece lens (2) is a biconvex lens, the third eyepiece lens (3) is a biconvex lens, and the fourth eyepiece lens (4) is a concave-convex lens with the convex surface facing the object side. The fifth eyepiece lens (5) and the sixth eyepiece lens (6) form a cemented lens. The fifth eyepiece lens (5) is a biconcave lens, and the sixth eyepiece lens (6) is a biconvex lens.

2. The ultra-wide-angle eyepiece according to claim 1, characterized in that: Along the optical axis, the center thickness of the first eyepiece lens (1) is 1.8 mm, the center thickness of the second eyepiece lens (2) is 4.2 mm, the center thickness of the third eyepiece lens (3) is 2.3 mm, the center thickness of the fourth eyepiece lens (4) is 2.6 mm, the center thickness of the fifth eyepiece lens (5) is 1.6 mm, and the center thickness of the sixth eyepiece lens (6) is 2.4 mm.

3. The ultra-wide-angle eyepiece according to claim 1, characterized in that: The distance between the second eyepiece (2) and the third eyepiece (3) along the optical axis is 0.3 mm, the distance between the third eyepiece (3) and the fourth eyepiece (4) is 0.3 mm, and the distance between the fourth eyepiece (4) and the fifth eyepiece (5) is 13.8 mm.

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