A continuous zoom gunsight mirror with stable exit pupil plane and wide field of view

Abstract

This invention discloses a continuous zoom rifle sight with a stable exit pupil and a wide field of view. Along the optical axis from object to image, it comprises: a front fixed group, a zoom group, a compensation group, a rear fixed group, and an eyepiece. When the zoom group is furthest from the front fixed group, the rifle sight is at its lowest magnification and maximum field of view; when the zoom group is closest to the front fixed group, the rifle sight is at its highest magnification and smallest field of view. The rifle sight has an exit pupil distance of 90mm, an exit pupil diameter of 3mm, a field of view range of 2.3-23 degrees, and a zoom magnification range of 1-10x. This invention achieves stable exit pupil position, constant exit pupil diameter, and a high zoom ratio with a wide field of view for target observation and aiming, facilitating rapid target detection and locking.

Description

Technical Field

[0001] This invention belongs to the field of optical design and manufacturing, and specifically relates to a continuous zoom gun sight with a stable exit pupil and a wide field of view. Background Technology

[0002] With advancements in science and technology, rifle scopes are evolving towards higher magnification ratios (up to 10x), wider fields of view (over 20 degrees), miniaturization, and higher image quality. Currently, commercially available rifle scopes typically have magnification ratios of 3-5x and fields of view of 8-12 degrees, but their exit pupil position and aperture cannot be kept stable. A small field of view hinders the detection and tracking of fast-moving targets; the unstable exit pupil position and aperture also impede rapid target locking. Therefore, designing rifle scopes with high magnification ratios, wide fields of view, and stable exit pupils is essential. Currently, there are no rifle scopes with a field of view exceeding 20 degrees. Summary of the Invention

[0003] Purpose of the invention: In order to overcome the shortcomings of the prior art, the present invention provides a continuous zoom gun sight with a stable exit pupil and a wide field of view.

[0004] Technical solution: A continuous zoom gun sight with a stable exit pupil and a wide field of view, wherein the continuous zoom gun sight has an exit pupil distance of 90mm, an exit pupil diameter of 3mm, a field of view of 2.3-23 degrees, and a zoom magnification range of 1-10x.

[0005] As an optimization: the continuous zoom gun sight is provided with the following components along the optical axis from the object side to the image side: a front fixed lens group, a zoom lens group, a compensation lens group, a rear fixed lens group, and an eyepiece.

[0006] The zoom lens and the compensation lens move axially along the optical axis to change the field of view and magnification. During zooming, the zoom lens and the compensation lens always move towards the front fixed group. When the zoom lens is farthest from the front fixed group lens, the rifle sight is at the lowest magnification and the maximum field of view; when the zoom lens is closest to the front fixed group lens, the rifle sight is at the highest magnification and the minimum field of view.

[0007] As an optimization: the front fixed lens group consists of 6 mirrors, with the last single lens acting as a field lens, and the structure of the first 5 mirrors is single-single + double-single; the focal length of the front fixed lens group is positive.

[0008] As an optimization: the zoom lens is a cemented doublet structure; the focal length of the zoom lens is positive.

[0009] As an optimization: the compensation lens group is a double-single structure; the focal length of the compensation lens group is positive.

[0010] As an optimization: the rear fixed lens group also functions as a field lens, and its structure is a double-single + single structure; the focal length of the rear fixed lens group is negative.

[0011] As an optimization: the eyepiece is a double-single-single-single structure.

[0012] As an optimization: all lenses are spherical lenses.

[0013] Beneficial effects: This invention achieves stable exit pupil position, constant exit pupil diameter, and high magnification ratio with a large field of view for observation and aiming at targets, facilitating rapid target detection and locking. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the gun sight structure of the present invention with 1x zoom and a field of view of 23 degrees;

[0015] Figure 2 This is a schematic diagram of the MTF curve during 1x zoom of the present invention;

[0016] Figure 3 This is a schematic diagram of the MTF curve during 2x zoom of the present invention;

[0017] Figure 4 This is a schematic diagram of the MTF curve at 5x zoom according to the present invention;

[0018] Figure 5 This is a schematic diagram of the MTF curve when the present invention is zoomed 10x. Detailed Implementation

[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below, so that those skilled in the art can better understand the advantages and features of the present invention, thereby making a clearer definition of the scope of protection of the present invention. The embodiments described in this invention are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0020] Example

[0021] like Figure 1 As shown, a continuous zoom gun sight with a stable exit pupil and a wide field of view is described. The continuous zoom gun sight has an exit pupil distance of 90mm, an exit pupil diameter of 3mm, a field of view of 2.3-23 degrees, and a zoom magnification range of 1-10x.

[0022] The continuous zoom rifle sight is provided with the following components arranged sequentially from the object side to the image side along the optical axis: a front fixed lens group, a zoom lens group, a compensation lens group, a rear fixed lens group, and an eyepiece. The zoom lens group and the compensation lens group move axially along the optical axis to change the field of view and magnification. During zooming, the zoom lens group and the compensation lens group always move towards the front fixed lens group. When the zoom lens group is furthest from the front fixed lens group, the rifle sight is at its lowest magnification and maximum field of view; when the zoom lens group is closest to the front fixed lens group, the rifle sight is at its highest magnification and minimum field of view.

[0023] In this embodiment, the front fixed lens group consists of six mirrors, with the last single lens acting as a field lens. The first five mirrors have a single-single + double-single structure; the focal length of the front fixed lens group is positive. The zoom lens group has a cemented doublet structure; its focal length is positive. The compensation lens group has a double-single structure; its focal length is positive. The rear fixed lens group also functions as a field lens, with a double-single + single structure; its focal length is negative. The eyepiece has a double-single-single-single structure. All lenses are spherical lenses.

[0024] Figure 1 This is a structural diagram of the gun sight of the present invention with 1x zoom and a field of view of 23 degrees. The eye distance is 90mm. Specific structural parameters are shown in Table 1, and zoom amount is shown in Table 2.

[0025] Table 1. Structural parameters of the gun sight (unit: mm)

[0026]

[0027]

[0028] Table 2 Zoom of Gun Scopes

[0029]

[0030] Figures 2-5 This is an MTF curve observed by the human eye at the exit pupil. The graph shows that the MTF across the entire field of view is better than 0.3 at a zoom range of 1-5x and a frequency of 40 lp / mm; and at a maximum zoom of 10x and a frequency of 20 lp / mm, the MTF value across the entire field of view is also better than 0.3. The system exhibits excellent image quality and meets the requirements for use with visual optical instruments.

[0031] This invention achieves stable exit pupil position, constant exit pupil diameter, and high magnification ratio with a large field of view for target observation and aiming, facilitating rapid target detection and locking.

Claims

1. A continuous zoom rifle sight with a stable exit pupil and a wide field of view, characterized in that: The continuous zoom gun sight has an exit pupil distance of 90mm, an exit pupil diameter of 3mm, a field of view of 2.3-23 degrees, and a zoom magnification range of 1-10x. The continuous zoom gun sight is provided with the following components along the optical axis from the object side to the image side: a front fixed lens group, a zoom lens group, a compensation lens group, a rear fixed lens group, and an eyepiece. The zoom lens and the compensation lens move axially along the optical axis to change the field of view and magnification. During zooming, the zoom lens and the compensation lens always move towards the front fixed lens. When the zoom lens is farthest from the front fixed lens, the rifle sight is at the lowest magnification and the maximum field of view; when the zoom lens is closest to the front fixed lens, the rifle sight is at the highest magnification and the minimum field of view. The front fixed lens group consists of 6 mirrors, with the last single lens acting as a field lens. The structure of the first 5 mirrors is single-single + double-single. The focal length of the front fixed lens group is positive. The zoom lens is a cemented doublet structure; the focal length of the zoom lens is positive. The compensation lens group is a double-single structure; the focal length of the compensation lens group is positive. The rear fixed lens group also functions as a field lens, and its structure is a double-single + single structure; the focal length of the rear fixed lens group is negative. The eyepiece described is a double-single-single-single structure; All lenses are spherical lenses.

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