Telescope optical system

Abstract

The invention discloses a telescope optical system, which belongs to the technical field of telescope manufacturing and is characterized in that a first objective lens, a second objective lens, a third objective lens, a focusing lens, a semi-pentaprism, a roof prism, a first eyepiece lens, a second eyepiece lens, a third eyepiece lens and a fourth eyepiece lens are sequentially arranged from an object side to an image side, according to the fifth lens of the eyepiece, the imaging quality is improved by using multiple groups of balsaming lenses.

Description

Technical Field

[0001] The invention relates to the technical field of telescope manufacturing, in particular to a telescope optical system. Background Art

[0002] A telescope is a visual optical instrument used to observe distant objects. It can magnify the small angle of distant objects by a certain ratio, so that they have a larger angle in the image space, making objects that are originally impossible to see or distinguish with the naked eye become clear and distinguishable. Therefore, the telescope is an indispensable tool in astronomical and ground observation. It is an optical system that allows the incident parallel light beams to remain parallel through the objective lens and eyepiece.

[0003] However, due to the different optical path designs, the imaging quality of telescopes varies. Summary of the invention

[0004] The object of the present invention is to provide a telescope optical system to solve the problems raised in the above background technology.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: a telescope optical system, characterized in that: from the object side to the image side, an objective lens first lens, an objective lens second lens, an objective lens third lens, a focusing lens, a half pentaprism, a roof prism, an eyepiece first lens, an eyepiece second lens, an eyepiece third lens, an eyepiece fourth lens, and an eyepiece fifth lens are sequentially arranged; the objective lens first lens and the objective lens second lens form a cemented lens; the objective lens first lens is a biconvex lens, the objective lens second lens is a concave-convex lens with a concave surface facing the object side, the objective lens third lens is a concave-convex lens with a convex surface facing the object side, and the focusing lens is a concave-convex lens with a convex surface facing the object side; The first lens of the eyepiece is a double concave lens, the second lens of the eyepiece is a double convex lens, the first lens of the eyepiece and the second lens of the eyepiece form a cemented lens, the third lens of the eyepiece is a double convex lens, the fourth lens of the eyepiece is a concave-convex lens, with the concave surface facing the object side, the third lens of the eyepiece and the fourth lens of the eyepiece form a cemented lens, and the fifth lens of the eyepiece is a concave-convex lens, with the convex surface facing the object side.

[0006] As a preferred technical solution, the object side curvature radius of the first lens of the objective lens is 118.30mm, the image side curvature radius is -68.39mm, the center thickness is 7.5mm, the material is glass H-FK61, and the diameter is 44mm; the object side curvature radius of the second lens of the objective lens is 68.39mm, the image side curvature radius is -259.7mm, the center thickness is 3.6mm, the material is glass H-F1, and the diameter is 44mm; the object side curvature radius of the third lens of the objective lens is 55.72mm, the image side curvature radius is 117.76mm, the center thickness is 5mm, the material is glass H-K9L, and the diameter is 44mm; the object side curvature radius of the focusing lens is 66.68mm, the image side curvature radius is 38.9mm, the center thickness is 2.3mm, the material is glass H-K9L, and the diameter is 26mm; the object side curvature radius of the first lens of the eyepiece is -37.58mm, and the image side curvature radius is 20. 597mm, the center thickness is 3mm, the material is glass H-ZF88, and the diameter is 24mm; the object side curvature radius of the second lens of the eyepiece is -20.597mm, the image side curvature radius is 20.597mm, the center thickness is 9.5mm, the material is glass H-ZK9, and the diameter is 24mm; the object side curvature radius of the third lens of the eyepiece is 46.13mm, the image side curvature radius is -46.13mm, the center thickness is 5mm, the material is glass H-ZK9, and the diameter is 26mm; the object side curvature radius of the fourth lens of the eyepiece is 46.13mm, the image side curvature radius is -43.05mm, the center thickness is 2.3mm, the material is glass H-ZF7L, and the diameter is 26mm; the object side curvature radius of the fifth lens of the eyepiece is 20.597mm, the image side curvature radius is 202.3mm, the center thickness is 5.5mm, the material is glass H-ZK9, and the diameter is 26mm.

[0007] As an optimal technical solution, the length of the optical system is 135.3 mm, the distance between the second lens and the third lens of the objective lens along the optical axis direction is 2.5 mm, the distance between the third lens of the objective lens and the focusing lens is 31 mm, the distance between the focusing lens and the semi-penta prism is 20 mm, the distance between the roof prism and the first lens of the eyepiece is 12.5 mm, the distance between the second lens and the third lens of the eyepiece is 0.2 mm, and the distance between the fourth lens and the fifth lens of the eyepiece is 0.2 mm.

[0008] Compared with the prior art, the beneficial effects achieved by the present invention are: The optical system of the present application is a 10x lens with a field of view of 6.3 degrees, an exit pupil distance of 16.8 mm, and a close focus distance of 6 m. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings: Figure 1 is a schematic diagram of an optical system of the present invention; Figure 2 is a field curvature distortion diagram of the present invention; Figure 3 is an aberration diagram of the present invention; Figure 4 is a point diagram of the present invention; Figure 5 It is the center point brightness diagram of the present invention. DETAILED DESCRIPTION

[0010] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0011] like Figure 1 As shown, the present invention provides the following technical solutions: a telescope optical system, characterized in that: from the object side to the image side, an objective lens first lens 1, an objective lens second lens 2, an objective lens third lens 3, a focusing lens 4, a half pentaprism 5, a roof prism 6, an eyepiece first lens 7, an eyepiece second lens 8, an eyepiece third lens 9, an eyepiece fourth lens 10, and an eyepiece fifth lens 11 are sequentially arranged, the objective lens first lens 1 and the objective lens second lens 2 form a cemented lens, the objective lens first lens 1 is a biconvex lens, the objective lens second lens 2 is a concave-convex lens with a concave surface facing the object side, the objective lens third lens 3 is a concave-convex lens with a convex surface facing the object side, and the focusing lens 4 is a concave-convex lens with a convex surface facing the object side; The first lens 7 of the eyepiece is a double concave lens, the second lens 8 of the eyepiece is a double convex lens, the first lens 7 and the second lens 8 of the eyepiece form a cemented lens, the third lens 9 of the eyepiece is a double convex lens, the fourth lens 10 of the eyepiece is a concave-convex lens, with the concave surface facing the object side, the third lens 9 and the fourth lens 10 of the eyepiece form a cemented lens, and the fifth lens 11 of the eyepiece is a concave-convex lens, with the convex surface facing the object side.

[0012] As a preferred technical solution, the first lens 1 of the objective lens has an object side curvature radius of 118.30 mm, an image side curvature radius of -68.39 mm, a center thickness of 7.5 mm, a material of glass H-FK61, and a diameter of 44 mm; the second lens 2 of the objective lens has an object side curvature radius of 68.39 mm, an image side curvature radius of -259.7 mm, a center thickness of 3.6 mm, a material of glass H-F1, and a diameter of 44 mm; the third lens 3 of the objective lens The object side curvature radius is 55.72mm, the image side curvature radius is 117.76mm, the center thickness is 5mm, the material is glass H-K9L, and the diameter is 44mm; the object side curvature radius of the focusing lens 4 is 66.68mm, the image side curvature radius is 38.9mm, the center thickness is 2.3mm, the material is glass H-K9L, and the diameter is 26mm; the object side curvature radius of the eyepiece first lens 7 is -37.58mm, and the image side curvature radius is 20. 597mm, the center thickness is 3mm, the material is glass H-ZF88, the diameter is 24mm; the curvature radius of the object side of the second lens 8 of the eyepiece is -20.597mm, the curvature radius of the image side is 20.597mm, the center thickness is 9.5mm, the material is glass H-ZK9, the diameter is 24mm; the curvature radius of the object side of the third lens 9 of the eyepiece is 46.13mm, the curvature radius of the image side is -46.13mm, the center thickness is 5mm, the material is glass Glass H-ZK9 is used, with a diameter of 26mm; the object side curvature radius of the fourth lens 10 of the eyepiece is 46.13mm, the image side curvature radius is -43.05mm, the center thickness is 2.3mm, and the material is glass H-ZF7L, with a diameter of 26mm; the object side curvature radius of the fifth lens 11 of the eyepiece is 20.597mm, the image side curvature radius is 202.3mm, the center thickness is 5.5mm, and the material is glass H-ZK9, with a diameter of 26mm.

[0013] As a preferred technical solution, the length of the optical system is 135.3 mm, the distance between the second lens 2 of the objective lens and the third lens 3 of the objective lens along the optical axis direction is 2.5 mm, the distance between the third lens 3 of the objective lens and the focusing lens 4 is 31 mm, the distance between the focusing lens 4 and the semi-penta prism 5 is 20 mm, the distance between the roof prism 6 and the first lens 7 of the eyepiece is 12.5 mm, the distance between the second lens 8 of the eyepiece and the third lens 9 of the eyepiece is 0.2 mm, and the distance between the fourth lens 10 of the eyepiece and the fifth lens 11 of the eyepiece is 0.2 mm.

[0014] Figure 1 It is the optical path diagram of the patent of the present invention, which mainly shows the structure and positional relationship of the optical system of the present invention. The optical system of the present application is a 10x lens with a field of view angle of 6.3 degrees, an exit pupil distance of 16.8mm, and a close focus distance of 6m.

[0015] Figure 2It is the field curvature distortion diagram of the present invention application. Field curvature distortion is mainly used to describe the deformation of the edge of the image plane after imaging. The field curvature distortion diagram shows 4.09%, which is in good condition and the distortion is less than 5%. After the optical system sample of the present application is produced, there will be no obvious deformation at the edge after imaging.

[0016] Figure 3 It is the aberration diagram of the present application. The aberration diagram describes the field of view change curve from the center to the edge of the entire field of view. In principle, the more concentrated and overlapping the curves are, the better the imaging quality is. The present application selects the aberrations at four field of view points. Since the aberration diagram of the present application is a half-field of view curve, the field of view of the entire optical system is twice the half-field of view. The fields of view of the present application are 0°, 1.5°, 2.1°, and 3.15°, respectively, and the wavelengths are 0.486um, 0.588um, 0.656um, and 0.435um, respectively. It can be seen from the aberration diagram that in the same field of view at different wavelengths, the four curves have a high degree of overlap and the imaging quality is also good.

[0017] Figure 4 This is the spot diagram of the present invention. The wavelength of visible light is 400-700nm. The spot diagram selects the 587.562nm band to describe the imaging quality of the optical system. In principle, the more concentrated the spot, the more concentrated the display energy, and the higher the imaging quality. Figure 5 It is the center point brightness diagram of this application, which shows the brightness distribution of the object pointed by the telescope at the center of the telescope's field of view. It is used in the calibration and debugging process of the telescope to ensure that the telescope can accurately capture and focus the light from the target object, determine whether the telescope has achieved the expected accuracy and performance requirements, and make necessary adjustments and optimizations.

[0018] We Figure 1-Figure 5 From the overall analysis, we can conclude that the entire optical system has good imaging quality and low field curvature distortion. The entire telescope optical system further reduces the size of the telescope while maintaining the imaging quality. The product length is 144.5mm, which is a relatively good telescope optical system. It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A telescope optical system, characterized in that: An objective lens first lens (1), an objective lens second lens (2), an objective lens third lens (3), a focusing lens (4), a half pentaprism (5), a roof prism (6), an eyepiece first lens (7), an eyepiece second lens (8), an eyepiece third lens (9), an eyepiece fourth lens (10), and an eyepiece fifth lens (11) are sequentially arranged along the optical axis from the object side to the image side. The objective lens first lens (1) and the objective lens second lens (2) form a cemented lens. The objective lens first lens (1) is a biconvex lens, the objective lens second lens (2) is a concave-convex lens with its concave surface facing the object side, the objective lens third lens (3) is a concave-convex lens with its convex surface facing the object side, and the focusing lens (4) is a concave-convex lens with its convex surface facing the object side. The first eyepiece lens (7) is a biconcave lens, the second eyepiece lens (8) is a biconvex lens, the first eyepiece lens (7) and the second eyepiece lens (8) form a cemented lens, the third eyepiece lens (9) is a biconvex lens, the fourth eyepiece lens (10) is a concave-convex lens, the concave surface of the lens faces the object side, the third eyepiece lens (9) and the fourth eyepiece lens (10) form a cemented lens, and the fifth eyepiece lens (11) is a concave-convex lens, the convex surface of the lens faces the object side.

2. A telescope optical system according to claim 1, characterized in that: The first lens (1) of the objective lens has an object side curvature radius of 118.30 mm, an image side curvature radius of -68.39 mm, a center thickness of 7.5 mm, is made of glass H-FK61, and has a diameter of 44 mm; the second lens (2) of the objective lens has an object side curvature radius of 68.39 mm, an image side curvature radius of -259.7 mm, a center thickness of 3.6 mm, is made of glass H-F1, and has a diameter of 44 mm; the third lens (3) of the objective lens has an object side curvature radius of half The diameter is 55.72mm, the image side curvature radius is 117.76mm, the center thickness is 5mm, the material is glass H-K9L, and the diameter is 44mm; the object side curvature radius of the focusing lens (4) is 66.68mm, the image side curvature radius is 38.9mm, the center thickness is 2.3mm, the material is glass H-K9L, and the diameter is 26mm; the object side curvature radius of the first lens of the eyepiece (7) is -37.58mm, and the image side curvature radius is 20.597m m, with a center thickness of 3 mm, made of glass H-ZF88, and a diameter of 24 mm; the object side curvature radius of the eyepiece second lens (8) is -20.597 mm, the image side curvature radius is 20.597 mm, the center thickness is 9.5 mm, and the material is glass H-ZK9, with a diameter of 24 mm; the object side curvature radius of the eyepiece third lens (9) is 46.13 mm, the image side curvature radius is -46.13 mm, the center thickness is 5 mm, and the material is glass The object side curvature radius of the eyepiece fourth lens (10) is 46.13mm, the image side curvature radius is -43.05mm, the center thickness is 2.3mm, and the material is glass H-ZF7L, with a diameter of 26mm; the object side curvature radius of the eyepiece fifth lens (11) is 20.597mm, the image side curvature radius is 202.3mm, the center thickness is 5.5mm, and the material is glass H-ZK9, with a diameter of 26mm.

3. A telescope optical system according to claim 1, characterized in that: The length of the optical system is 135.3 mm, the distance between the objective lens second lens (2) and the objective lens third lens (3) along the optical axis direction is 2.5 mm, the distance between the objective lens third lens (3) and the focusing lens (4) is 31 mm, the distance between the focusing lens (4) and the semi-penta prism (5) is 20 mm, the distance between the roof prism (6) and the eyepiece first lens (7) is 12.5 mm, the distance between the eyepiece second lens (8) and the eyepiece third lens (9) is 0.2 mm, and the distance between the eyepiece fourth lens (10) and the eyepiece fifth lens (11) is 0.2 mm.

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