Eyepiece structure for long eye relief large display

Abstract

The utility model discloses an eyepiece structure of long pupil distance big display screen, including lens barrel (1), eyepiece one (2) and cemented lens (3), eyepiece one (2) and cemented lens (3) install in lens barrel (1) inside, eyepiece one (2) and cemented lens (3) are arranged along the optical axis L in order from the eye side to the image side, the cemented lens (3) is made of eyepiece two (31) and eyepiece three (32) cemented, the focal length of whole eyepiece is 51 1mm, and the magnification is 5 0.2 times, and the pupil distance is 65 1mm, and the image side can place 1.1 inch display screen. It pupil distance is long, and the eye does not have to close eyepiece to see the whole field of view, reduces the eye tiredness, secondly, the image side can place 1.1 inch display screen, and the screen membrane size is big and the magnification is low, and the image of watching is more clear, and the distortion is small.

Description

Technical Field

[0001] This utility model relates to an eyepiece structure for a large display screen with an extended pupil distance, and particularly to the field of telescope rangefinders. Background Technology

[0002] Existing laser rangefinding telescope systems (or rangefinders) generally include an objective lens assembly, an inverted image prism assembly, a display screen, an eyepiece assembly, a laser emitting assembly, and a laser receiving assembly. For details, see patent number CN202221921053, entitled "A Binocular Telescope Rangefinding System," where the eyepiece system is a crucial component of the laser rangefinder. The specific optical path diagram of the rangefinder is shown below. Figure 1 As shown, the eyepiece systems in existing rangefinders on the market have an exit pupil distance of about 30mm, a magnification of 15x, and a 0.39-inch display screen. If the exit pupil distance is too short, the eye must be very close to the eyepiece to see the entire field of view, which will cause eye strain. The 15x magnification combined with a 0.39-inch display screen will result in poor image clarity and blurring, leading to a poor user experience. Summary of the Invention

[0003] This utility model provides an eyepiece structure for a large display screen with a long exit pupil distance, which solves the technical problems in the prior art where the exit pupil distance of the eyepiece system is about 30mm, the magnification is 15x, and the matching display screen is 0.39 inches, which means that the eyes must be close to the eyepiece to see the entire field of view, which will cause the eyes to be very tired; and the small display screen and large magnification will result in poor image clarity and blurring, which will lead to a poor user experience.

[0004] The technical solution of this utility model is implemented as follows:

[0005] An eyepiece structure for a large display screen with an extended interpupillary distance includes a lens barrel, an eyepiece one, and a cemented lens. The eyepiece one and the cemented lens are installed inside the lens barrel. The eyepiece one and the cemented lens are arranged alternately along the optical axis L from the eye side to the image plane side. The cemented lens is formed by cementing together an eyepiece two and an eyepiece three. Its characteristic is that:

[0006] The eyepiece is a positive lens with a first flat surface and a first convex surface. The flat surface faces the eye side and the convex surface faces the image plane side. The focal length is 84.3±1mm.

[0007] The second eyepiece is a positive lens with a second convex surface and a third convex surface;

[0008] The third eyepiece is a negative lens with a second concave surface and a first concave surface. The first concave surface is cemented to the third convex surface, and the second concave surface faces the image plane.

[0009] The focal length of the cemented lens is 136±1mm;

[0010] The focal length of the entire eyepiece is 51±1mm, the magnification is 5±0.2x, and the exit pupil distance is 65±1mm.

[0011] A 1.1-inch display can be placed on the front side.

[0012] Preferably, the eyepiece and the cemented lens are separated by a spacer, and a lens locking ring is threaded onto one end of the lens barrel to lock the eyepiece and the cemented lens.

[0013] Preferably, an external thread is provided on the outer side of one end of the lens barrel.

[0014] Compared with the prior art, this utility model has the following advantages:

[0015] 1. The eyepiece of this utility model is a positive lens with a focal length of 84.3±1mm; the cemented lens has a focal length of 136±1mm; the total focal length of the eyepiece is 51±1mm, the magnification is 5±0.2x, and the exit pupil distance is 65±1mm; a 1.1-inch display screen can be placed on the image side. The long exit pupil distance means the eye does not need to be close to the eyepiece to see the entire field of view, reducing eye strain. Furthermore, the 1.1-inch display screen on the image side, with its large screen size and low magnification, provides a clearer image with less distortion.

[0016] 2. Other advantages of this utility model are described in detail in the embodiments section. Attached Figure Description

[0017] Figure 1 This is the optical path diagram of a rangefinder in the prior art;

[0018] Figure 2 This is a perspective view of the present invention from one angle;

[0019] Figure 3 This is a perspective view of the present invention from another angle;

[0020] Figure 4 This is an exploded view of the present invention;

[0021] Figure 5 This is a cross-sectional view of the present invention. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0023] like Figures 2 to 5 As shown, this embodiment provides an eyepiece structure for a large display screen with a long interpupillary distance, including a lens barrel 1, an eyepiece 2, and a cemented lens 3. The eyepiece 2 and the cemented lens 3 are installed inside the lens barrel 1. The eyepiece 2 and the cemented lens 3 are arranged alternately along the optical axis L from the eye side to the image plane side. The cemented lens 3 is formed by cementing together an eyepiece 2 31 and an eyepiece 32. Its characteristic is that:

[0024] The eyepiece 2 is a positive lens with a first plane 21 and a first convex surface 22. The plane 21 faces the eye side and the convex surface 22 faces the image plane side. The focal length is 84.3±1mm.

[0025] The second eyepiece 31 is a positive lens with a second convex surface 311 and a third convex surface 312;

[0026] The eyepiece 32 is a negative lens with a second concave surface 321 and a first concave surface 322. The first concave surface 322 is cemented to the third convex surface 312, and the second concave surface 321 faces the image plane.

[0027] The focal length of cemented lens 3 is 136±1mm;

[0028] The focal length of the entire eyepiece is 51±1mm, the magnification is 5±0.2x, and the exit pupil distance is 65±1mm.

[0029] A 1.1-inch display can be placed on the front side.

[0030] Preferably, the eyepiece 2 and the cemented lens 3 are separated by a spacer 4, and the lens locking ring 5 is threaded onto one end of the lens barrel 1 and locks the eyepiece 2 and the cemented lens 3.

[0031] Preferably, an external thread 11 is provided on the outer side of one end of the lens barrel 1.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not 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 eyepiece structure for a large display screen with an extended interpupillary distance, comprising a lens barrel (1), an eyepiece one (2), and a cemented lens (3), wherein the eyepiece one (2) and the cemented lens (3) are installed inside the lens barrel (1), and the eyepiece one (2) and the cemented lens (3) are arranged alternately along the optical axis L from the eye side to the image plane side, wherein the cemented lens (3) is formed by cementing together an eyepiece two (31) and an eyepiece three (32), characterized in that: The eyepiece 1 (2) is a positive lens with a first plane (21) and a first convex surface (22). The plane (21) faces the eye side and the convex surface (22) faces the image plane side. The focal length is 84.3±1mm. The second eyepiece (31) is a positive lens with a second convex surface (311) and a third convex surface (312); The eyepiece three (32) is a negative lens with a second concave surface (321) and a first concave surface (322). The first concave surface (322) is cemented to the third convex surface (312), and the second concave surface (321) faces the image plane. The focal length of the cemented lens (3) is 136±1mm; The focal length of the entire eyepiece is 51±1mm, the magnification is 5±0.2x, and the exit pupil distance is 65±1mm. A 1.1-inch display can be placed on the front side.

2. The eyepiece structure for a large display screen with an extended interpupillary distance according to claim 1, characterized in that: Eyepiece 1 (2) and cemented lens (3) are separated by spacer ring (4), and lens locking ring (5) is threaded to one end of lens barrel (1) and locks eyepiece 1 (2) and cemented lens (3).

3. The eyepiece structure for a large display screen with an extended interpupillary distance according to claim 1 or 2, characterized in that: An external thread (11) is provided on the outer side of one end of the lens tube (1).

Images