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CN-224232023-U - Four-piece type refraction telescope

CN224232023UCN 224232023 UCN224232023 UCN 224232023UCN-224232023-U

Abstract

The utility model discloses a four-piece type refraction telescope which comprises a lens barrel, a front objective lens group and a rear objective lens group, wherein the front objective lens group is axially arranged at one end in the lens barrel and comprises a first lens and a second lens which are coaxially arranged, the rear objective lens group is axially arranged at the other end in the lens barrel and comprises a third lens and a fourth lens which are coaxially arranged, and the distance between the third lens and the fourth lens is larger than the distance between the first lens and the second lens. In the four-piece type refraction telescope, the distance between the two lenses at the image side is far greater than the distance between the two lenses at the object side, so that the sensitivity of the hardware of the post-objective lens group is reduced, the processing requirement is reduced although the whole precision is unchanged, the yield and the output are improved, and the production efficiency is further improved.

Inventors

  • Jiang Piqiang

Assignees

  • 江苏以太光学科技有限公司

Dates

Publication Date
20260512
Application Date
20250721

Claims (10)

  1. 1. A four-piece refractive telescope comprising: a lens barrel; the front objective lens group is axially arranged at one end in the lens barrel along the lens barrel and comprises a first lens and a second lens which are coaxially arranged; The post-objective lens group is axially arranged at the other end in the lens barrel and comprises a third lens and a fourth lens which are coaxially arranged, and the distance between the third lens and the fourth lens is larger than that between the first lens and the second lens.
  2. 2. The four-piece refractive telescope of claim 1, wherein the front and rear objective lens assemblies comprise front and rear lens mounts, respectively, the first and second lenses being secured to the front lens mount, the third and fourth lenses being secured to the rear lens mount.
  3. 3. The four-piece refractive telescope of claim 1, wherein the barrel comprises a main barrel and a connecting barrel coaxial with and movably connected to the main barrel, the front and rear objective lens groups being mounted within the connecting barrel and main barrel, respectively.
  4. 4. A four-piece refractive telescope according to claim 3, wherein a star-finding lens mount is provided on the outer wall of said primary lens barrel.
  5. 5. The four-piece refractive telescope of claim 4, wherein a plurality of said star-finding lens holders are disposed on an outer wall of said main lens barrel.
  6. 6. A four-piece refractive telescope according to claim 3, wherein a flat field lens is provided in said main barrel, said flat field lens being located on a side of said rear objective mount facing away from said front objective mount.
  7. 7. A four-piece refractive telescope according to claim 3, wherein said barrel further comprises a corner mirror or camera joint mounted to an end of said main barrel facing away from the connecting barrel.
  8. 8. The four-piece refractive telescope of claim 7, wherein the angle at which the camera joint connects to one end of the camera is adjustable.
  9. 9. The four-piece refractive telescope of claim 7, wherein the fixed positions of the camera joint and the corner mirror are adjustable.
  10. 10. A four-piece refractive telescope according to claim 3, wherein said main barrel and said connecting barrel are connected by a rack, and a knob connected to and driving said rack to move is fixed to an outer wall of said main barrel.

Description

Four-piece type refraction telescope Technical Field The utility model belongs to the technical field of telescopes, and particularly relates to an improved four-piece type refraction telescope. Background The refractive telescope (REFRACTING TELESCOPE) is a telescope using a lens as an objective lens, using refractive imaging, with a wide field of view, high contrast and good sharpness. The appearance of the thin-wall long tube structure of the refraction telescope is not greatly different from the galilean age in century, and the refraction telescope is a popular design for people who want simple mechanical design, high reliability and convenient use. The refraction telescope is internally provided with a plurality of lenses in a lens group mode, but the distance between adjacent lenses in the lens group is usually smaller, which puts high requirements on the process and increases the production cost. The information disclosed in this background section is only for enhancement of understanding of the general background of the utility model and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person of ordinary skill in the art. Disclosure of utility model The utility model aims to provide an improved four-piece type refraction telescope which is used for solving the problem of high production cost. In order to achieve the above objective, a specific embodiment of the present utility model provides a four-piece refractive telescope, including a lens barrel, a front objective lens group and a rear objective lens group, wherein the front objective lens group is axially disposed at one end of the lens barrel and includes a first lens and a second lens coaxially disposed, the rear objective lens group is axially disposed at the other end of the lens barrel and includes a third lens and a fourth lens coaxially disposed, and a distance between the third lens and the fourth lens is greater than a distance between the first lens and the second lens. In one or more embodiments of the present utility model, the front objective lens group and the rear objective lens group respectively include a front lens holder and a rear lens holder, the first lens and the second lens are fixed on the front lens holder, and the third lens and the fourth lens are fixed on the rear lens holder. In one or more embodiments of the present utility model, the lens barrel includes a main lens barrel and a connection barrel coaxially and movably connected thereto, and the front and rear objective lens groups are installed in the connection barrel and the main lens barrel, respectively. In one or more embodiments of the present utility model, a star finding lens base is disposed on an outer wall of the main lens barrel. In one or more embodiments of the present utility model, the outer wall of the main lens barrel is provided with a plurality of star-finding lens bases. In one or more embodiments of the present utility model, a flat field lens is disposed in the main lens barrel, and the flat field lens is located on a side of the rear objective lens base away from the front objective lens base. In one or more embodiments of the utility model, the lens barrel further comprises a corner mirror or camera joint mounted to an end of the main barrel facing away from the connecting barrel. In one or more embodiments of the present utility model, an angle at which the camera lens is connected to one end of the camera is adjustable. In one or more embodiments of the utility model, the camera joint and the fixed position of the corner mirror are adjustable. In one or more embodiments of the present utility model, the main barrel and the connection barrel are connected through a rack, and a knob connected to and driving the rack to move is fixed on an outer wall of the main barrel. Compared with the prior art, in the four-piece type refraction telescope, the distance between the two lenses at the image side is far greater than the distance between the two lenses at the object side, so that the sensitivity of the hardware of the post-objective lens group is reduced, the whole precision is unchanged, but the processing requirement is reduced, thereby improving the yield and the output, and further improving the production efficiency. Drawings In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present utility model, and other drawings may be obtained according to the drawings without inventive effort to those skilled in the art. FIG. 1 is a schematic view of a four-piece refractive telescope according to an embodiment of the present utility model; FIG. 2 is a cross-sec