Telescope optical system and telescope

Abstract

The utility model discloses a telescope optical system and a telescope, and the telescope optical system is used for measuring stars, and comprises an objective lens group, a focusing lens group, a beam splitter prism, a reticle, an eyepiece group, a band-pass color filter, and an infrared camera. The objective lens group, the focusing lens group, the beam splitter prism, the reticle and the eyepiece group are sequentially arranged from an object plane to an image plane along a first direction, the infrared camera, the band-pass color filter and the beam splitter prism are sequentially arranged along a second direction, and the first direction is perpendicular to the second direction. A beam splitting film of the beam splitting prism reflects an infrared part and cuts off visible light, a transmission part of the beam splitting prism penetrates through the visible light and cuts off an infrared band, and optical positions of the reticle and the infrared camera are in the same focus. The telescope optical system can be used for measuring stars, and the optical system is compact in structure and small in size, so that the telescope can be integrated on a theodolite for astronomical positioning measurement.

Description

TECHNICAL FIELD

[0001] The utility model relates to optical instrument technical field, concretely relates to a telescope optical system and telescope. BACKGROUND

[0002] In prior art, part telescopes can only collect visible light, and this kind of telescope cannot be used for measuring stars. The astronomical telescope for observing celestial bodies and capturing celestial body information has multiple structure forms with the continuous updating of technology, but these astronomical telescopes all have the problems of large structure volume and inconvenience for carrying, and this kind of telescope also cannot be integrated on the theodolite for use. SUMMARY

[0003] The utility model aims at the deficiency in prior art, and provides a telescope optical system capable of measuring stars and small in structure volume.

[0004] To achieve the above-mentioned purpose, the utility model adopts the technical scheme of:

[0005] A telescope optical system for measuring stars, comprising an objective lens group, a focusing lens group, a light-splitting prism, a graticule, an eyepiece group, a band-pass filter and an infrared camera, wherein the objective lens group, the focusing lens group, the light-splitting prism, the graticule and the eyepiece group are sequentially arranged along a first direction from an object plane to an image plane, the infrared camera, the band-pass filter and the light-splitting prism are sequentially arranged along a second direction, the first direction is perpendicular to the second direction, a light-splitting film of the light-splitting prism reflects an infrared part and cuts off visible light, a transmission part of the light-splitting prism transmits visible light and cuts off an infrared waveband, and the graticule and the infrared camera are in optical focus.

[0006] In some embodiments, the objective lens group comprises an objective lens first lens, an objective lens second lens, an objective lens third lens and an objective lens fourth lens sequentially arranged along a first direction from an object plane to an image plane; the object side surface of the objective lens first lens is in concave or plane structure, and the image side surface thereof is in concave structure; the object side surface of the objective lens second lens is in convex structure, and the image side surface thereof is in convex structure; the object side surface of the objective lens third lens is in convex structure, and the image side surface thereof is in concave structure; and the object side surface of the objective lens fourth lens is in concave structure, and the image side surface thereof is in concave structure.

[0007] In some embodiments, the objective lens first lens and the objective lens second lens form a cemented lens, and / or the objective lens third lens and the objective lens fourth lens form a cemented lens.

[0008] In some embodiments, the focusing lens group comprises, sequentially arranged along a first direction from an object plane to an image plane, a focusing first lens, a focusing second lens and a focusing third lens, the object side surface of the focusing first lens is convex or planar, and the image side surface of the focusing first lens is convex; the object side surface of the focusing second lens is concave, and the image side surface of the focusing second lens is concave or planar; and the object side surface of the focusing third lens is convex, and the image side surface of the focusing third lens is convex or planar.

[0009] In some embodiments, the focusing first lens and the focusing second lens form a cemented lens.

[0010] In some embodiments, the eyepiece lens group comprises, sequentially arranged along a first direction from an object plane to an image plane, an eyepiece first lens, an eyepiece second lens, an eyepiece third lens, an eyepiece fourth lens and an eyepiece fifth lens; the object side surface of the eyepiece first lens is convex or planar, and the image side surface of the eyepiece first lens is concave; the object side surface of the eyepiece second lens is convex, and the image side surface of the eyepiece second lens is convex; the object side surface of the eyepiece third lens is convex, and the image side surface of the eyepiece third lens is convex; the object side surface of the eyepiece fourth lens is concave, and the image side surface of the eyepiece fourth lens is convex or planar; and the object side surface of the eyepiece fifth lens is convex, and the image side surface of the eyepiece fifth lens is convex.

[0011] In some embodiments, the eyepiece first lens and the eyepiece second lens form a cemented lens, and / or the eyepiece third lens and the eyepiece fourth lens form a cemented lens.

[0012] In some embodiments, the clear aperture of the optical system is not less than 50 mm, the magnification of the optical system is not less than 30 times, and the overall infrared transmittance of the optical system is greater than 80%.

[0013] The utility model also provides a telescope with the optical system as claimed in any one of the preceding embodiments.

[0014] In some embodiments, the telescope further comprises a lens barrel, and the optical system is arranged in the lens barrel.

[0015] The telescope further comprises a light shield cover arranged outside the objective lens group, and the light shield cover is fixedly arranged on the lens barrel.

[0016] The focusing lens group can be moved to adjust the position along the first direction, and the telescope further comprises two Hall sensors arranged in the lens barrel to monitor the position of the focusing lens group, one Hall sensor is arranged close to the objective lens group, and the other Hall sensor is arranged close to the beam-splitting prism.

[0017] With the technical scheme, the telescope optical system can be used for star measurement, and the optical system has compact structure and small volume, so that the telescope can be integrated on the theodolite for astronomical positioning measurement. BRIEF DESCRIPTION OF DRAWINGS

[0018] ATTACHMENT Figure 1 The figure is a perspective view of the telescope optical system of the embodiment after removing part of the structure.

[0019] 1, objective lens group; 11, objective lens first lens; 12, objective lens second lens; 13, objective lens third lens; 14, objective lens fourth lens; 2, focusing lens group; 21, focusing first lens; 22, focusing second lens; 23, focusing third lens; 3, light splitting prism; 4, reticle; 5, eyepiece lens group; 51, eyepiece first lens; 52, eyepiece second lens; 53, eyepiece third lens; 54, eyepiece fourth lens; 55, eyepiece fifth lens; 6, band-pass filter; 7, infrared camera; S1, object side of the objective lens first lens; S2, image side of the objective lens first lens; S3, object side of the objective lens second lens; S4, image side of the objective lens second lens; S5, object side of the objective lens third lens; S6, image side of the objective lens third lens; S7, object side of the objective lens fourth lens; S8, image side of the objective lens fourth lens; S9, object side of the focusing first lens; S10, image side of the focusing first lens; S11, object side of the focusing second lens; S12, image side of the focusing second lens; S13, object side of the focusing third lens; S14, image side of the focusing third lens; S15, object side of the eyepiece first lens; S16, image side of the eyepiece first lens; S17, object side of the eyepiece second lens; S18, image side of the eyepiece second lens; S19, object side of the eyepiece third lens; S20, image side of the eyepiece third lens; S21, object side of the eyepiece fourth lens; S22, image side of the eyepiece fourth lens; S23, object side of the eyepiece fifth lens; S24, image side of the eyepiece fifth lens. DETAILED DESCRIPTION

[0020] The technical scheme of the utility model will be described clearly and completely below in combination with the drawings, obviously, the described embodiment is a part of the embodiment of the utility model, rather than all the embodiment. Based on the embodiment in the utility model, all other embodiments obtained by the person skilled in the art without making the creative labor belong to the scope of protection of the utility model.

[0021] The telescope of the utility model is used for measuring stars, and the telescope comprises a lens barrel and an optical system arranged in the lens barrel.

[0022] As Figure 1As shown, the telescope optical system comprises an objective lens group 1, a focusing lens group 2, a light splitting prism 3, a reticle 4, an eyepiece lens group 5, a band-pass filter 6 and an infrared camera 7.

[0023] The objective lens group 1, the focusing lens group 2, the light splitting prism 3, the reticle 4 and the eyepiece lens group 5 are sequentially arranged along a first direction from an object plane to an image plane, the infrared camera 7 and the band-pass filter 6 are sequentially arranged along a second direction, and the first direction is perpendicular to the second direction. The infrared camera 7 and the band-pass filter 6 are located in a reflection path of the light splitting prism 3, a light splitting film of the light splitting prism 3 reflects an infrared part and cuts off visible light, a transmission part of the light splitting prism 3 transmits visible light and cuts off an infrared waveband, and the reticle 4 and the infrared camera 7 are in optical focus. In the optical path system, all the optical components except the light splitting prism 3 are designed to have wideband antireflection from visible light to near infrared.

[0024] The objective lens group 1 comprises an objective lens first lens 11, an objective lens second lens 12, an objective lens third lens 13 and an objective lens fourth lens 14 sequentially arranged along the first direction from the object plane to the image plane.

[0025] The object side S1 of the objective lens first lens 11 is in a concave or plane structure, and the image side S2 thereof is in a concave structure.

[0026] The object side S3 of the objective lens second lens 12 is in a convex structure, and the image side S4 thereof is in a convex structure.

[0027] The object side S5 of the objective lens third lens 13 is in a convex structure, and the image side S6 thereof is in a concave structure.

[0028] The object side S7 of the objective lens fourth lens 14 is in a concave structure, and the image side S8 thereof is in a concave structure.

[0029] The objective lens first lens 11 and the objective lens second lens 12 form a cemented lens, and / or the objective lens third lens 13 and the objective lens fourth lens 14 form a cemented lens. The formation of the double cemented lens can reduce or eliminate chromatic aberration, improve imaging quality, and also improve the transmittance of the lens, reduce assembly difficulty, reduce the length of the telescope, and thus reduce the structural volume.

[0030] The focusing lens group 2 comprises a focusing lens first lens 21, a focusing lens second lens 22 and a focusing lens third lens 23 sequentially arranged along the first direction from the object plane to the image plane.

[0031] The object side S9 of the focusing lens first lens 21 is in a convex or plane structure, and the image side S10 thereof is in a convex structure.

[0032] The object side S11 of the focusing lens second lens 22 is in a concave structure, and the image side S12 thereof is in a concave or plane structure.

[0033] The object side S13 of the focusing third lens 23 is convex, and the image side S14 is convex or flat.

[0034] The focusing first lens 21 and the focusing second lens 22 form a cemented lens. The chromatic aberration can be reduced or eliminated, the imaging quality can be improved, the transmittance of the lens can be improved, the assembly difficulty can be reduced, and the structure size can be reduced.

[0035] The eyepiece group 5 includes, in the first direction from the object plane to the image plane, an eyepiece first lens 51, an eyepiece second lens 52, an eyepiece third lens 53, an eyepiece fourth lens 54, and an eyepiece fifth lens 55.

[0036] The object side S15 of the eyepiece first lens 51 is convex or flat, and the image side S16 is concave.

[0037] The object side S17 of the eyepiece second lens 52 is convex, and the image side S18 is convex.

[0038] The object side S19 of the eyepiece third lens 53 is convex, and the image side S20 is convex.

[0039] The object side S21 of the eyepiece fourth lens 54 is concave, and the image side S22 is convex or flat.

[0040] The object side S23 of the eyepiece fifth lens 55 is convex, and the image side S24 is convex.

[0041] The eyepiece first lens 51 and the eyepiece second lens 52 form a cemented lens, and / or the eyepiece third lens 53 and the eyepiece fourth lens 54 form a cemented lens. The chromatic aberration can be reduced or eliminated, the imaging quality can be improved, the transmittance of the lens can be improved, the assembly difficulty can be reduced, and the structure size can be reduced.

[0042] A band-pass filter 6 is added in the infrared part, which can further reduce the influence of stray light and background noise.

[0043] The maximum clear aperture of the optical system, i.e., the object side S1 of the first lens 11, is not less than 50 mm, the magnification of the optical system is not less than 30 times, and the overall infrared transmittance of the optical system is greater than 80%.

[0044] Since the telescope optical system can realize all-day star measurement, the stray light elimination measure needs to be considered for daytime star measurement. The telescope further includes a light shield, which is irradiated on the outside of the objective lens group 1, and the signal-to-noise ratio of the telescope optical system is improved through the light shield. The lens barrel is provided with a mounting interface at the position of the objective lens group 1, and the light shield is mounted to the mounting interface.

[0045] The focusing lens group 2 can move along the first direction to adjust the position so as to adjust the focal length, since the telescope optical system works in the infinite position when measuring stars and works in the finite position when observing ground targets, in order to facilitate the rapid focusing and the consistency with the calibration parameters of the infrared camera 7, the telescope further comprises Hall sensors, the positions of the focusing lens group 2 are monitored through the Hall sensors, and the Hall sensors are used for the rapid positioning of the focusing lens group 2. The Hall sensors are provided with two, and the two Hall sensors are both arranged in the lens barrel. One Hall sensor is arranged close to the objective lens group 1 and is used for monitoring the infinite position. The other Hall sensor is arranged close to the light splitting prism 3 and is used for monitoring the nearest focusing position.

[0046] The working principle of the telescope optical system is as follows:

[0047] When the telescope optical system works, external light enters the lens barrel of the telescope from the objective lens group 1, visible light passes through the objective lens group 1, the focusing lens group 2 and the light splitting prism 3 and is finally imaged on the graticule 4 for the observation of the human eye. Infrared light also passes through the objective lens group 1, the focusing lens group 2, is split by the light splitting prism 3 and is imaged on the infrared camera 7 after passing through the band-pass filter 6.

[0048] The above embodiment is only for describing the technical concept and characteristics of the utility model, the purpose is to enable the person skilled in the art to understand the content of the utility model and implement it, and cannot limit the protection scope of the utility model. Any equivalent change or modification according to the spirit and essence of the utility model should be covered in the protection scope of the utility model.

Claims

1. A telescope optical system for star measurement, characterized by: The optical system comprises an objective lens group, a focusing lens group, a light-splitting prism, a reticle, an eyepiece lens group, a band-pass filter and an infrared camera, the objective lens group, the focusing lens group, the light-splitting prism and the reticle are sequentially arranged along a first direction from an object plane to an image plane, the infrared camera and the band-pass filter are sequentially arranged along a second direction, the first direction is perpendicular to the second direction, a light-splitting film of the light-splitting prism reflects an infrared part and cuts off visible light, a transmission part of the light-splitting prism transmits visible light and cuts off an infrared waveband, the reticle and the infrared camera are in optical focus.

2. The telescope optical system of claim 1, wherein: The objective lens group comprises an objective lens first lens, an objective lens second lens, an objective lens third lens and an objective lens fourth lens sequentially arranged along the first direction from the object plane to the image plane; the object side surface of the objective lens first lens is in a concave or plane structure, and the image side surface thereof is in a concave structure; the object side surface of the objective lens second lens is in a convex structure, and the image side surface thereof is in a convex structure; the object side surface of the objective lens third lens is in a convex structure, and the image side surface thereof is in a concave structure; and the object side surface of the objective lens fourth lens is in a concave structure, and the image side surface thereof is in a concave structure.

3. The telescope optical system of claim 2, wherein: The objective lens first lens and the objective lens second lens form a cemented lens, and / or the objective lens third lens and the objective lens fourth lens form a cemented lens.

4. The telescope optical system of claim 1, wherein: The focusing lens group comprises a focusing lens first lens, a focusing lens second lens and a focusing lens third lens sequentially arranged along the first direction from the object plane to the image plane, the object side surface of the focusing lens first lens is in a convex or plane structure, and the image side surface thereof is in a convex structure; the object side surface of the focusing lens second lens is in a concave structure, and the image side surface thereof is in a concave or plane structure; and the object side surface of the focusing lens third lens is in a convex structure, and the image side surface thereof is in a convex or plane structure.

5. The telescope optical system of claim 4, wherein: The focusing lens first lens and the focusing lens second lens form a cemented lens.

6. The telescope optical system of claim 1, wherein: The eyepiece lens group comprises an eyepiece lens first lens, an eyepiece lens second lens, an eyepiece lens third lens, an eyepiece lens fourth lens and an eyepiece lens fifth lens sequentially arranged along the first direction from the object plane to the image plane; the object side surface of the eyepiece lens first lens is in a convex or plane structure, and the image side surface thereof is in a concave structure; the object side surface of the eyepiece lens second lens is in a convex structure, and the image side surface thereof is in a convex structure; the object side surface of the eyepiece lens third lens is in a convex structure, and the image side surface thereof is in a convex structure; the object side surface of the eyepiece lens fourth lens is in a concave structure, and the image side surface thereof is in a convex or plane structure; and the object side surface of the eyepiece lens fifth lens is in a convex structure, and the image side surface thereof is in a convex structure.

7. The telescope optical system of claim 6, wherein: The eyepiece lens first lens and the eyepiece lens second lens form a cemented lens, and / or the eyepiece lens third lens and the eyepiece lens fourth lens form a cemented lens.

8. The telescope optical system of claim 1, wherein: The clear aperture of the optical system is not less than 50 mm, the magnification of the optical system is not less than 30 times, and the overall infrared transmittance of the optical system is greater than 80%.

9. A telescope characterized by: The optical system has any one of claims 1-8.

10. The telescope of claim 9, wherein: The telescope further comprises a lens barrel, and the optical system is arranged in the lens barrel. The telescope further comprises a light shield cover arranged outside the objective lens group, and the light shield cover is fixedly arranged on the lens barrel. The telescope further comprises a light shield cover arranged outside the objective lens group, and the light shield cover is fixedly arranged on the lens barrel. The focus lens group is capable of moving along a first direction to adjust a position, the telescope further comprises two Hall sensors arranged in the lens barrel to monitor the position of the focus lens group, one Hall sensor is arranged close to the objective lens group, and the other Hall sensor is arranged close to the beam splitter prism.

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