Middle-low magnification binocular telescope with ultra-large field of view

Abstract

The utility model provides a low-magnification binocular telescope in an ultra-large view field. The low-magnification binocular telescope comprises a left side lens barrel, a right side lens barrel and a middle shaft assembly 8, the left side lens cone and the right side lens cone are composed of a positive image assembly 1, an objective lens assembly 4, a focusing mechanism 5 and an eyepiece assembly 6, the objective lens assembly 4 and the eyepiece assembly 6 jointly form a traditional Kepler optical system, the positive image assembly 1 is used for converting an inverted image obtained by the Kepler optical system into a positive image, and the focusing mechanism 5 is used for focusing the positive image. The focusing mechanism 5 is used for adjusting the distance between the objective lens assembly 4 and the eyepiece assembly 6; the left side lens cone and the right side lens cone are integrated together through the middle shaft assembly 8, so that the optical axes of the left side lens cone and the right side lens cone are approximately kept parallel, and a light inlet 2 is formed in the positive image assembly 1. The binocular telescope gives consideration to the moderate amplification factor, achieves the ultra-large TFOV, and brings a stronger immersive feeling to an observer. In addition, a 5-10 times medium-high magnification binocular telescope with an ultra-large field of view can be realized.

Description

Technical Field

[0001] The present invention belongs to the field of optical telescopes, and particularly relates to a binocular telescope with an ultra-large field of view and medium-low magnification. When an observer observes the night sky with this system, it will bring a strong sense of immersion and an experience of roaming in the starry sky. Background Art

[0002] For a scene observer, especially a starry sky observer, the larger the apparent field of view (FOV) and the true field of view (TFOV) of a binocular telescope are, the larger the field of view subjectively felt by the human eye is, and the larger the range of the true field of view seen is, which will bring a stronger immersive experience. However, the FOV of common handheld binocular telescopes is <85°, and the TFOV is <12°. Only constellation telescopes with a magnification as low as 2 - 3 times can achieve a TFOV ≥ 20°; common handheld binocular telescopes generally have a Kepler structure, and the magnification is mostly between 5 - 15 times, while constellation telescopes (generally with a Galileo structure) have a magnification mostly between 2 - 3 times, and the magnification between 3 - 5 times is relatively rare. The above binocular telescopes either have a relatively high magnification and it is difficult to achieve a TFOV ≥ 20°, or have a relatively low magnification and it is difficult to present sufficient details. There is even a blank for binocular telescopes that can simultaneously achieve a TFOV ≥ 20° and a magnification of 3 - 5 times.

[0003] The ultra-large field of view and medium-low magnification binocular telescope proposed by the present invention takes into account the ultra-large TFOV index, appropriate magnification, and relatively large exit pupil diameter, bringing an immersive sense of high-brightness starry sky roaming to the observer, and making it more convenient to observe the galactic arm structure, constellations, meteors, etc. Summary of the Invention

[0004] To solve the problems existing in the prior art, the present invention provides a large-field-of-view medium-low magnification binocular telescope, which includes a left barrel, a right barrel and a central axis assembly 8; the left barrel and the right barrel are composed of an erecting assembly 1, an objective lens assembly 4, a focusing mechanism 5, and an eyepiece assembly 6. Among them, the objective lens assembly 4 and the eyepiece assembly 6 together form a traditional Kepler optical system. The erecting assembly 1 is used to convert the inverted image obtained by the Kepler optical system into an erect image, and the focusing mechanism 5 is used to adjust the distance between the objective lens assembly 4 and the eyepiece assembly 6; the central axis assembly 8 integrates the left barrel and the right barrel, making the optical axes of the left barrel and the right barrel approximately parallel, enabling the imaging of the left barrel and the right barrel to be combined, and having the function of adjusting the interpupillary distance to adapt to users with different interpupillary distances; an incident light port 2 is provided on the erecting assembly 1; a parallel holding mechanism 7 is provided on the erecting assembly 1 to keep the erecting assembly 1 connected to the left barrel and the right barrel parallel. The parallel holding mechanism 7 consists of a guide rail 9 and two sliders 10. The two sliders 10 are the same and translate along the length direction of the guide rail 9. The two sliders 10 are respectively fixedly connected to the left barrel and the right barrel.

[0005] Further, a rotating mechanism 3 is provided between the objective lens assembly 4 and the erecting assembly 1 for adjusting the relative angle between the erecting assembly 1 and the objective lens assembly 4.

[0006] The present invention provides a large-field-of-view medium-low magnification binocular telescope, which takes into account a moderate magnification factor and at the same time achieves a large TFOV, bringing a stronger sense of immersion to the observer. In addition, the present invention can also implement a large-field-of-view, 5-10 times medium-high magnification binocular telescope. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 Structural schematic diagram of a large-field-of-view medium-low magnification binocular telescope.

[0008] Figure 2 Schematic diagram of the parallel holding mechanism.

[0009] The specific markings in the figure are: 1 - erecting assembly; 2 - incident light port; 3 - rotating mechanism; 4 - objective lens assembly; 5 - focusing mechanism; 6 - eyepiece assembly; 7 - parallel holding mechanism; 8 - central axis assembly; 9 - guide rail; 10 - slider. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0010] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0011] Combined with Figure 1 , the specific implementation manners of the present invention are described as follows.

[0012] Implementation manner of the left barrel: The objective lens assembly 4 and the eyepiece assembly 6 together form a traditional Kepler optical system. The focusing mechanism 5 is installed between the objective lens assembly 4 and the eyepiece assembly 6 and is used to adjust the distance between the objective lens assembly 4 and the eyepiece assembly 6. The erecting assembly 1 is installed in front of the objective lens.

[0013] Implementation manner of the right barrel: The objective lens assembly 4 and the eyepiece assembly 6 together form a traditional Kepler optical system. The focusing mechanism 5 is installed between the objective lens assembly 4 and the eyepiece assembly 6 and is used to adjust the distance between the objective lens assembly 4 and the eyepiece assembly 6. The erecting assembly 1 is installed in front of the objective lens.

[0014] The central axis assembly 8 integrates the left barrel and the right barrel together, keeps the optical axes of the left barrel and the right barrel approximately parallel, and at the same time can adjust the distance between the left barrel and the right barrel.

[0015] When the FOV is fixed, a smaller magnification (such as 2 - 3 times) will bring a larger TFOV, but too small a magnification is difficult to balance the magnification of details; when the FOV is fixed, a larger magnification (such as more than 6 times) is beneficial to the observation of details, but it is impossible to achieve an extremely large TFOV. Therefore, taking a magnification of 3 - 5 times as an example, the specific implementation manners are described, and the selection of each component is described as follows.

[0016] 1. The objective lens assembly 4 can select a high-quality objective lens with a smaller focal ratio (objective lens focal length / objective lens aperture), such as an objective lens with an aperture of 32 mm and a focal length of 60 mm. However, it should be noted that the outer diameter of the objective lens assembly 4 cannot exceed the interpupillary distance of a person's eyes, otherwise binocular observation is difficult to achieve.

[0017] 2. The eyepiece assembly 6 should select an eyepiece with a larger FOV, such as an eyepiece with a focal length = 13 mm and an FOV = 100°. The specifications of the assembled telescope are 4.6×32 (i.e., the magnification is about 4.6 times and the aperture is 32 mm), and the TFOV is about 21.7°, far exceeding the common TFOV = 6 - 12° of binocular telescopes; in addition, the exit pupil diameter can also reach about 7 mm, which is the maximum diameter that an ordinary person's eye pupil can reach in the dark environment, and is beneficial to observing fainter targets under the night sky with less light pollution.

[0018] 3. The erecting assembly 1 can be an Amici roof prism, a roof prism, a Porro prism, etc. Its clear aperture should not be less than the diameter of the objective lens. Considering that the Amici roof prism belongs to a right-angle turning prism and can deflect light by 90°, for stargazers, they can observe the zenith target by looking straight ahead without having to raise their heads forcefully, which can bring a more comfortable experience. In this embodiment, the Amici roof prism is preferably used as the erecting assembly.

[0019] However, using the Amici roof prism will introduce a new problem. That is, when the central axis assembly 8 is adjusted to change the distance between the left barrel and the right barrel to adapt to the interpupillary distance of different users, the optical axes of the left barrel and the right barrel no longer remain parallel, and the two optical axes show an "inward V" or "outward V" effect, resulting in the inability of the left barrel and the right barrel to form an image. Therefore, the present invention introduces a parallelism maintaining mechanism 7 to keep the two erecting assemblies 1 parallel when the central axis assembly 8 is adjusted.

[0020] As Figure 2 shown, the parallelism maintaining mechanism 7 consists of a guide rail 9 and sliders 10. Among them, the two sliders 10 are the same and can only translate along the length direction of the guide rail 9, without being able to produce translation in other directions and rotation in any direction. Therefore, the two sliders 10 always maintain a parallel relationship during translation. Specifically, during implementation, the two sliders 10 are respectively rigidly connected to the two erecting assemblies 1. When the telescope user adjusts the interpupillary distance by adjusting the central axis assembly 8, the central axis assembly 8 drives the two objective lens assemblies 4 to move. The two objective lens assemblies 4 respectively drive the two erecting assemblies 1 to produce relative movement, making the optical axes closer or farther apart, so as to achieve the adjustment of the interpupillary distance. Due to the existence of the parallelism maintaining mechanism 7, the two erecting assemblies 1 always remain parallel, that is, the optical axes of the left barrel and the right barrel always remain parallel. During the adjustment of the interpupillary distance, relative rotation is bound to occur between the erecting assembly 1 and the objective lens assembly 4, and this relative rotation is realized by the rotating mechanism 3.

[0021] At the same time, a rotating mechanism 3 is installed between the erecting assembly 1 and the objective lens assembly 4 to make the erecting assembly 1 and the objective lens assembly 4 produce natural relative rotation when the central axis assembly 8 is adjusted. The final effect is that the user can conveniently adjust the interpupillary distance of a large-field-of-view, medium-low magnification binocular telescope, and the optical systems on both sides still maintain parallel optical axes. The user can focus on the observation experience and does not have to spend time and effort adjusting the parallelism of the two erecting assemblies 1 every time the distance between the left barrel and the right barrel is adjusted.

[0022] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A low-magnification binoculars with a large field of view, characterized in that It comprises a left lens barrel, a right lens barrel and a central axis assembly (8); The left lens barrel and the right lens barrel are composed of an erecting assembly (1), an objective lens assembly (4), a focusing mechanism (5), and an eyepiece assembly (6), wherein the objective lens assembly (4) and the eyepiece assembly (6) together form a traditional Kepler optical system, the erecting assembly (1) is used to convert an inverted image obtained by the Kepler optical system into an erect image, and the focusing mechanism (5) is used to adjust the distance between the objective lens assembly (4) and the eyepiece assembly (6); The central axis assembly (8) integrates the left lens barrel and the right lens barrel together, so that the optical axes of the left lens barrel and the right lens barrel are approximately parallel, so that the left lens barrel and the right lens barrel form a combined image, and has the function of adjusting the pupil distance to accommodate users with different pupil distances; The erecting component (1) is provided with a light entrance (2); A parallel holding mechanism (7) is arranged on the erecting assembly (1) to keep the erecting assembly (1) connected to the left lens barrel and the right lens barrel parallel to each other. The parallel holding mechanism (7) is composed of a guide rail (9) and two sliders (10). The two sliders (10) are identical and move in a longitudinal direction of the guide rail (9). The two sliders (10) are fixedly connected to the left lens barrel and the right lens barrel, respectively.

2. The ultra-large field of view low-power binoculars according to claim 1, characterized in that A rotating mechanism (3) is provided between the objective lens assembly (4) and the erecting image assembly (1) for adjusting the relative angle between the erecting image assembly (1) and the objective lens assembly (4).

Images