An optical fiber panel-based ultra-short focal length red dot sight optical path system and a red dot sight

Abstract

The utility model relates to a kind of super short focal length red dot sighting telescope optical path system and red dot sighting telescope based on optical fiber panel, including light source, partial reflection optical element and optical fiber panel;Light source is used to project reflection image to partial reflection optical element;Partial reflection optical element, is set back to lean, reflection and collimation reflection image;Optical fiber panel is placed between light source and partial reflection optical element and is adjacent to light source, to transmit reflection image to the reflection surface of partial reflection optical element;The light exit end surface of optical fiber panel towards partial reflection optical element is same with the focal plane of partial reflection optical element.Spherical end surface of optical fiber panel can accurately aim at the focal plane of reflection glass, so that light emitted by light source can be reflected as collimation parallel light by reflection glass efficiently after being conducted and emitted by optical fiber panel, to significantly improve the definition of division bright spot and sighting accuracy under the premise of guaranteeing super short focal length, compact structure.

Description

Technical Field

[0001] This utility model relates to an optical path system for an ultra-short focal length red dot sight based on an optical fiber panel and a red dot sight. Background Technology

[0002] A red dot sight is a popular reflex sight. Its basic principle is that a light-emitting diode (LED) emits light that shines onto a partially coated curved reflective glass (usually spherical or parabolic). The reflective glass reflects and collimates this light into parallel light that enters the user's eye. The user then sees a parallax-free "red dot" image at infinity, which is used as the aiming point.

[0003] With the development of tactical and civilian needs, the demand for compact scopes is increasing, namely, the pursuit of ultra-short focal lengths. The shorter the focal length, the shorter and lighter the overall structure of the scope can be. However, shortening the focal length presents significant challenges to optical design:

[0004] The design of the reflective surface is complex: the shorter the focal length, the smaller the radius of curvature of the reflective glass, the more curved the surface, and the more difficult it is to correct aberrations (such as spherical aberration).

[0005] Focal plane mismatch: The most critical issue is that the focal plane of a curved reflector is a sphere, not a plane. In traditional designs, planar light sources (such as LED light-emitting surfaces) cannot coincide with the spherical focal plane of the reflector. For a surface light source of a certain size, the light emitted from its edges cannot be accurately focused on the focal plane of the reflector, resulting in the reflected light no longer being perfectly parallel. This causes the reticle (red dot) to become blurred, divergent, and produces coma or astigmatism, severely affecting aiming clarity and accuracy.

[0006] Existing technologies typically address this issue by employing complex aspherical mirrors or adding additional correction lens groups, but this significantly increases manufacturing costs and design complexity, making it unsuitable for ultra-short focal length red dot sights that require low-cost, high-volume production.

[0007] Therefore, there is an urgent need for a technical solution that is simple in structure, low in cost, and can effectively solve the problem of focal plane mismatch at ultra-short focal lengths. Utility Model Content

[0008] The purpose of this invention is to solve the problems of blurred imaging and reduced aiming accuracy caused by the mismatch between the focal plane of the reflective glass spherical surface and the planar light source in the prior art, and to achieve high-definition imaging of the aiming scope at ultra-short focal lengths.

[0009] To achieve the above objectives, this utility model provides an optical path system for an ultra-short focal length red dot sight based on an optical fiber panel, comprising: a light source, a partially reflective optical element, and an optical fiber panel;

[0010] The light source is used to project a reflected image onto the partially reflective optical element;

[0011] The partially reflective optical element is tilted backward to reflect and collimate the reflected image;

[0012] The optical fiber panel is positioned between and near the light source and the partially reflective optical element to transmit the reflected image to the reflective surface of the partially reflective optical element.

[0013] The light-emitting end face of the optical fiber panel facing the partially reflective optical element is the same as the focal plane of the partially reflective optical element.

[0014] Furthermore, the reflective surface of the partially reflective optical element is curved, and this curved surface is coated with a partially reflective film;

[0015] The light-emitting end face is curved.

[0016] Furthermore, the light incident end face of the optical fiber panel facing the light source is planar or the light incident end face has a shape that can fit onto the light emitting surface of the light source.

[0017] Furthermore, the optical fiber panel is attached to the light-emitting surface of the light source.

[0018] A red dot sight comprising the aforementioned ultra-short focal length red dot sight optical path system.

[0019] The beneficial effects of this utility model are:

[0020] Perfectly solves focal plane mismatch: By using the spherical end face of the fiber optic panel, a light source output surface with the same shape as the focal plane of the reflector is directly constructed, eliminating the aberration caused by the non-coincidence of the focal plane from the root, making the reticle points clearer and sharper.

[0021] Achieving a truly ultra-short focal length: This design enables the production of a high-quality collimated beam even with an extremely short focal length and a large curvature of the reflector, greatly promoting the compact development of red dot sights.

[0022] Simple structure and low cost: Compared with the high-cost solutions that use aspherical mirrors or complex correction lens groups, this invention only adds a customized fiber optic panel element. The structure is very simple, easy to assemble, and very suitable for mass production.

[0023] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. Attached Figure Description

[0024] Figure 1This is a schematic diagram of the optical path system of an ultra-short focal length red dot sight based on an optical fiber panel.

[0025] Figure 2 It is a cross-sectional view of a spherical light source.

[0026] Explanation of reference numerals in the attached diagram: 1. Light source; 2. Partially reflective optical element; 3. Optical fiber panel; 4. Reflective surface; 5. Light entry / exit end face; 6. Light incident end face; 7. Protective glass. Detailed Implementation

[0027] The present invention will be further described below with reference to the embodiments. However, those skilled in the art will understand that the following embodiments are only for illustrating the present invention and should not be regarded as limiting the scope of the present invention. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall apply. Where the manufacturers of reagents or instruments are not specified, they are all conventional products that can be purchased commercially. The specific embodiments described are only for explaining the principles of the present invention and are not intended to limit the present invention.

[0028] Figure 1 The diagram illustrates an optical path system for an ultra-short focal length red dot sight, comprising: a light source 1 (such as a conventional LED chip module, or a screen light source), a partially reflective optical element 2 (a conventional coated lens or lens group used as an objective lens, primarily for reflecting the reflected image projected by the emitted light from the light source, i.e., the aiming pattern), and an optical fiber panel 3. The partially reflective optical element 2 is tilted backward (i.e., tilted towards the light source 1) to reflect and collimate the reflected image projected by the light source 1 for the user to view. The optical fiber panel 3 is positioned between the light source 1 and the partially reflective optical element 2 to transmit the reflected image to the reflective surface 4 of the partially reflective optical element 2 (coated with a partially reflective film, as in existing technologies, to reflect the reflected image projected by the light source 1); and the light-emitting end face 5 of the optical fiber panel 3 facing the partially reflective optical element 2 is required to be the same as the focal plane of the partially reflective optical element 2. This is the core of this embodiment: the light-emitting end face 5 of the optical fiber panel 3 facing the partially reflective optical element 2 is ground into a curved surface, i.e., a concave spherical surface or a convex spherical surface, so that the light-emitting end face 5 completely coincides with or highly matches the focal plane of the partially reflective optical element 2; and the optical fiber panel 3 is placed close to the light source 1, specifically, the light-incident end face 6 of the optical fiber panel 3 facing the light source 1 can be attached to the light-emitting surface of the light source 1. In this way, it is equivalent to converting the original planar light source (i.e., the light source used in the prior art, the LED chip light source) into a Figure 2The spherical light source shown is precisely located on the focal plane of the partially reflective optical element 2. Therefore, all light rays emitted from the spherical light source, after being reflected by the partially reflective optical element 2, can become well parallel light, thus completely solving the problem of non-parallel light rays caused by focal plane mismatch in the prior art.

[0029] In this embodiment, since the light emitting surface of the light source 1 is a plane, the light incident end face 6 of the optical fiber panel 3 facing the light source 1 is designed to be a plane, so that it has a shape that can fit on the light emitting surface of the light source 1, achieving a good tight fit. The smaller the gap between the two, the more seamless the spherical light source can be formed.

[0030] In practice, the key points of processing and assembly are as follows: First, based on the radius of curvature and position of the selected partially reflective optical element 2, the curvature of its precise focal plane is calculated using optical design software. Then, the optical fiber panel 3 is custom-processed according to this curvature, and its light-emitting end face 5 is ground into a spherical surface corresponding to the partially reflective optical element 2. Finally, during assembly, the light source 1, the processed optical fiber panel 3, and the partially reflective optical element 2 are fixed to the housing 1 of the inner red dot sight according to the designed positions, ensuring that the spherical end face 5 of the optical fiber panel 3, i.e., the light-emitting end face 5, is precisely located on the focal plane of the partially reflective optical element 2. This ensures that the light emitted from the light source 1, after passing through the optical fiber panel 3, is precisely located on the focal plane of the partially reflective optical element 2, and is thus reflected by the partially reflective optical element 2, ultimately becoming precisely parallel light that enters the human eye. The user can therefore see a very clear and unambiguous infinity reticle, i.e., the reflection pattern mentioned in the aforementioned embodiment.

[0031] Finally, it should be noted that the light source 1 in the above embodiments can be... Figure 1 The fixed light source shown, with a large glossy surface, such as a display screen, can also be... Figure 2 The movable light source shown can move within the light-receiving surface range of the light-incident end face 6 of the optical fiber panel 3. This type is suitable for sights with a light source adjustment mechanism, such as a red dot sight.

[0032] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to any specific implementation. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. An optical path system for an ultra-short focal length red dot sight based on an optical fiber panel, characterized in that, include: Light source (1), partially reflective optical element (2) and optical fiber panel (3); The light source (1) is used to project a reflected image onto the partially reflective optical element (2); The partially reflective optical element (2) is tilted backward to reflect and collimate the reflected image; The optical fiber panel (3) is placed between and near the light source (1) and the partially reflective optical element (2) to transmit the reflected image to the reflective surface (4) of the partially reflective optical element (2); The light-emitting end face (5) of the optical fiber panel (3) facing the partially reflective optical element (2) is the same as the focal plane of the partially reflective optical element (2).

2. The optical path system according to claim 1, characterized in that, The reflective surface (4) of the partially reflective optical element (2) is a curved surface, which is coated with a partially reflective film; The light-emitting end face (5) is a curved surface.

3. The optical path system according to claim 2, characterized in that, The light incident end face (6) of the optical fiber panel (3) facing the light source (1) is either flat or has a shape that can fit onto the light emitting surface of the light source (1).

4. The optical path system according to claim 2 or 3, characterized in that, The optical fiber panel (3) is attached to the light emitting surface of the light source (1).

5. A red dot sight with an ultra-short focal length, characterized in that, The optical path system of the ultra-short focal length red dot sight based on the optical fiber panel as described in claim 4 is included.

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