KR20170049892A - Projection lens system for dot sight - Google Patents

Abstract

The present invention relates to a projection lens system for a dot sight. The projection lens system for a dot sight comprises: a light source, a light diffuser, a reticle pattern, field lenses, and a combiner lens in order. The light diffuser lights aiming points of a wide area by evenly diffusing the light by being placed in front of the light source. The field lenses having positive refractivity are arranged on the front surface of the reticle pattern, and the aiming points by range in accordance with a firearm trajectory can be clearly obtained. The reticle pattern permeates the light and forms the new light source by a diffraction phenomenon. The projection lenses forms a collimator forming an image of an aiming point pattern by using parallel light. Collimation lenses are a catadioptric optical system comprising the combiner lens and the field lenses and form an exit pupil of a large diameter. So, the collimation lenses overlays an outer image and an aiming point image in the wide area for easy observation. The field lenses increase a resolution of a wide upper surface of the projection lens and widen a field of a view. Also, the field lenses reduce a whole length of the optical system.

Description

[0001] The present invention relates to a projection lens system for a dot site,

The present invention relates to a projection lens system for a dot site having multiple aiming points, and more particularly, to a projection lens system for a dot site having multiple aiming points, more specifically, by arranging a view lens group near the aiming point generating unit, And a projection lens system for a dot site capable of displaying an aim point.

Traditionally, the gun aiming system used a line of sight alignment that aligns the scale and the scale linearly with the target, mechanically attached to the gun. Accurate bore sighting requires a lot of time and concentration. For quick shooting, the impact point of the bullet was visually checked or tracer was used. The line-of-sight sorting method has a disadvantage in that it is difficult to recognize the surrounding situation because it is closed with one eye and it is difficult to shoot a moving object.

In general, a dot site is a unit magnification aiming device having a point-shaped aiming point attached to a rifle, a machine gun, etc., and reflects an aiming point on a tilted glass surface so that an observer It allows you to observe. The inclined glass surface may be provided with a curvature to form collimating optics. Alternatively, an aspheric lens may be used to more clearly overlap the aiming point on the subject. However, since the aim point image can not be aligned with the diopter of the user, a user whose visual acuity is not 0 diopter can not see a clear aim point, and also has a disadvantage of seeing a blur aim point. Here, the dot aiming point is collectively referred to as a simple aiming point pattern having no point of intersection such as a point, a circle, and a cross line. Dot site using laser hologram was commercialized to realize the aiming point according to the fireball trajectory, but the aiming point is not clear, the time difference occurs, and the movement amount of the reticle is small. Since the laser beam is seen directly by the eye, there is a drawback that fatigue easily occurs in the eye. In addition, a mechanical ballistic correction device for moving an aim point by attaching a mechanical angle adjusting device at the bottom of a dot site is made. However, there is a disadvantage that the weight of the equipment is considerably increased due to adjustment of the device for each range to be aimed at shooting.

The dot site is a sighting device that projects a bright spot on a back surface of a lens with a structurally flat plate or a curvature lens to superimpose a light spot on a subject. The light spot is generally composed of a red illumination device, Simply aim the gun with the dot site so that the light spot overlaps the subject. As the aiming step is reduced, it is possible to quickly aim and replace the collimation alignment method using the existing scale and scale, and it is widely used in sports field and military.

The dot site can quickly align the line of sight and secure a wider field of view than the magnifying glass, and it is easier to perceive the surrounding situation by opening and aiming both eyes. In addition, it is suitable for general infantry shooting aiming equipment because it is easy to fire against the rapid target shooting and moving target. At close range, the shooter is capable of aiming and shooting, and has long eye-relief and wide pupil size with less parallax and comfortable to use. Also, if anyone has zero, multiple shooters can use it together, and a fast and accurate aiming shot is possible.

Dot site, which is a close-up aiming device, is parallax-free and can shoot quickly. Especially, it is effective before street and indoor. If the target is aligned with the aiming point, it is easy to set the target. Can be used as night vision. Theoretically, there is no parallax but the sight point and parallax are generated according to the distance of the object. When there is no sight point for each range and the monocular night vision is attached to the tail or worn on the head, There is a point of improvement such as reduction of performance.

The night vision system is a device for forming images converted into bright images by amplifying weak light in dark environments or at night, and is used for various purposes such as military, police, and research. Such a night vision goggle uses a principle of photoelectric effect, electron number amplification, electroluminescence effect and the like from a blurry image due to insufficient amount of light so as to easily identify a subject even in the dark As a device, the amount of light incident on the objective lens is very important, which greatly affects detection performance and image quality.

Therefore, the smaller the aperture diameter (f / number) = the effective focal length / the smaller the entrance pupil, the better the performance. The magnifier is attached to the object of night vision So that it can be observed to a long distance. The dot site will be used at night with a night vision goggle attached to the observation side. At this time, it is possible to use as a night sight of a firearm having a long effective range by using a dot site having an aiming point for each range.

Korean Registered Patent No. 1440057 (Registered on Mar. 3, 2014) Korean Registered Patent No. 0667472 (Registered on Apr. 4, 2007) U.S. Patent No. 7,145,703 (registered on December 5, 2006) U.S. Patent No. 6,490,060 (registered on December 3, 2002)

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and it is an object of the present invention to provide a zoom lens system capable of obtaining a clear sight point image by increasing the resolution from a dot site to a wide- And a projection optical system for projecting the projection optical system.

Another object of the present invention is to provide a projection lens system for a dot site that extends the range in which an aiming point can be obtained even when a viewing angle of a user is widened by widening a viewing angle and can be used as a small- And a projection lens system for a dot site.

In order to achieve the above object, a projection lens system for a dot site according to an aspect of the present invention includes: a light diffuser placed in front of a light source in order from a light source side to uniformly scatter light to illuminate a wide- A reticle which forms a new light source by diffraction and diffraction, a vision lens group with positive refractive power that increases the resolution of the aimpoint image, a sight lens group and a collimating optical system, And an image combiner, which is a reflection-refracting optical system that allows the viewer to visually observe the image at a wide and wide exit pupil.

 At this time, each of the lens groups and the reticular portion satisfies the following expression.

2.0 = F / f1 = 2.5

0.82 = F / f2 = 0.92

2.3 = f2 / f1 = 2.8

0.01 = D12 / F = 0.04

0.9 = D23 / F = 1.2

F2 is the effective focal length of the image coupler, F is the effective focal length of the collimator lens system, D12 is the distance between the field lens group and the reticle pattern, D23 is the distance between the image coupler and the field lens, Represents the distance between groups.)

 In a preferred embodiment of the present invention, a diaphragm may be provided between the image coupler and the observer.

As described above, the projection lens system for a dot site according to the embodiment of the present invention has a high resolution at a wide viewing angle, so that the aiming point for each range can be clearly obtained according to the fireball trajectory, and shooting accuracy can be improved. In addition, since the length of the optical system can be reduced, the dot site can be made compact and lightweight.

1 is a conceptual diagram of a projection lens system for a dot site according to a preferred embodiment of the present invention.
FIG. 2 is a view showing details of optical component parts of a projection lens system for a dot site according to a preferred embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a conceptual diagram of an optical part of a projection lens system for a dot site according to an embodiment of the present invention, which is composed of a screen part 100, a collimator lens part 200 and a stop 150. Referring to FIGS. 1 and 2, a mesh part 100 according to an embodiment of the present invention will be described. The net portion 100 according to the present embodiment is formed of a light source, a light diffuser 10, and a net 20.

The light source according to this embodiment is an LED (Light Emitting Diode), and the wavelength can be any of red, orange, green, and visible light. If the mesh pattern is a point or a small shape, you can spread the mesh pattern uniformly by keeping the mesh and the distance wide. However, if the mesh pattern is large, it is impossible to pass the light evenly over a wide area even if the distance is widened. Therefore, the light diffuser should be used to spread the light evenly. The light diffuser 10 is positioned in front of the light source to scatter light. Glass elements mixed with coloring elements such as opal and glass elements made of roughened surfaces such as sanding can be used. Appropriate devices should be selected considering light diffusivity as well as transmittance.

The mesh line 20 according to the present embodiment is located on the focal plane of the collimator lens system 200 to make the collimation point pattern like a light source. The metal coating is etched to allow light to pass through only the mesh pattern on the flat glass. The grating pattern plate for etching can be made precise to a resolution of 1 micrometer or less by laser processing. At this time, the metal coating is coated to a thickness that does not transmit light, and chromium oxide, chromium oxide, and aluminum can be used, but chromium oxide coating having a low reflectance and good light shielding effect is used. On the other hand, when the reticle 20 is moved from the focal plane to the up, down, left, and right sides, the aiming point moves downward and upward. Conventionally, moving the aiming point by moving the entire dot site mechanically moved the zero point of the firearm and the sights. Since only the net portion 100 is mechanically moved, a miniaturized aim point moving device can be made.

1 and 2, a collimator lens unit 200 according to an embodiment of the present invention will be described. The collimator lens unit 200 according to the present embodiment is formed of a field lens group 30 and an image combiner 40.

The group of the visual field lenses 30 according to the present embodiment is formed of a lens group having a positive refractive power. A visual field lens is a lens that collects rays passing through the top surface near the focal plane to prevent reduction in the amount of light and prevents the field of view from being cut off. It is used near the first focal plane of the telescope.

The visual field lens group 30 may be formed of a typical condensing lens shape and may be formed of a convex plane-convex lens, a double-let lens, or a separated double-layer lens convex on the object side. an aspheric lens may be used. This reduces the loss of light by refracting the light rays spreading in the mesh pattern toward the optical axis. On the observer's side, the rays of the outside reach the inside of the upper surface. That is, it is possible to design a widening of the viewing angle, so that even if the observation position is shaken, observation can be performed without missing the aiming point.

In addition, it reduces the overall length of the optical system compared to the effective focal length. In general, the shorter the effective focal length is, the worse the resolution of the aiming point pattern becomes, but the resolution can be increased by using the visual field lens at the short effective focal length.

The reflective surface of the image combiner 40 converts the image of the reticle pattern formed on the focal plane into parallel light so that the observer can easily observe the image, and also transmits the external scene to the observer. 1 and 2, the image coupler 40 is shown as a meniscus lens concave toward the observer. It is made by cutting the half of the circular lens and has the characteristic of the non-axial reflection collimator. The collimator lens system 200 converts an aim point image into an infinite ray and transmits it to an eye of an observer. The image coupler 40 may be composed of one spherical lens, a double-ply lens, or a separated double-ply lens, and an aspherical lens of a parabolic surface may be used. Plastic aspherical lenses can be used to lower costs in mass production. At this time, the rays from the subject are transmitted through the image coupler as they are, and overlapped with the aim point image. The image combiner should prevent distortion of the image of the subject and serve as an eye-piece. If the focal length is designed to be long or a low refractive index lens with a refractive index of 1.5 is used, the image distortion of the subject can be reduced. The distortion can be reduced by designing the refracting surface of the image coupler to satisfy the afocal condition with respect to the external image.

The color of the aiming point is reflected on the reflecting surface of the viewer side of the image combiner 40 so as to be well coated. The light intensity ratio between the aim point image and the outside scenery can be appropriately distributed according to the equipment performance and usage. When used for military purposes, it may be possible to use a narrow band reflective coating that matches the wavelength of the aiming point so that the position of the aiming point is visible on the object side. In this case, the aiming point reflection surface can be made of any surface of the lens, and spherical and aspheric lenses are advantageous for observers, and intermediate lenses for conjugated double lenses are advantageous. The coating can be made of metal (aluminum, silver, gold) or dielectric materials.

On the other hand, a stop 150 may be formed between the observer and the image combiner 40.

The diaphragm 150 may be positioned anywhere between the eye of the viewer and the image combiner depending on the position of the barrel. At this time, the closer the position of the diaphragm to the position of the observer, the smaller the observation viewing angle.

The collimator lens system 200 includes an image coupler 40, a group of field lenses 30 and a diaphragm 150 to form a reflective refraction type eyepiece optical system so that the collimation point pattern and the external landscape are overlapped and observed in a wide area. In addition, since the resolution is high, it is possible to observe sharp aiming points to increase the aiming accuracy when shooting, and to reduce the length of the optical system, thereby making a small hardened dot site.

The position tolerance of the group of sight lenses is insensitive and the focus of the aim point image can be adjusted when only the reticle is moved. The closer the view lens group is to the aiming point surface, the less the performance reduction due to the mechanism tolerance and the assembly tolerance, and no further alignment is required.

Also, the focal length ratio between the image coupler 40 and the view lens group 30 may vary according to the image coupler effective aperture. Considering the total length of the optical system, the image coupler should be designed to a certain low f / # to reduce the overall length of the optical system and to widen the viewing angle.

At this time, the collimator lens system 200 and the screen unit 100 satisfy the following equations.

2.0 = F / f1 = 2.5

0.82 = F / f2 = 0.92

2.3 = f2 / f1 = 2.8

0.01 = D12 / F = 0.04

0.9 = D23 / F = 1.2

F2 is the effective focal length of the image coupler, F is the effective focal length of the collimator lens system, D12 is the distance between the field lens group and the reticle pattern, D23 is the distance between the image coupler and the field lens, Represents the distance between groups.)

Meanwhile, in the preferred embodiment, a diaphragm 150 may be provided between the image coupler 40 and an observer, and an elongated light guide may be formed of a cylindrical or square-shaped instrument.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It is clear.

10: Light diffuser
20: Twine
30: field lens group
40: image combiner
100:
150: aperture
200: collimation lens system
M: partial reflection surface

Claims (7)

In a projection lens system for a dot site, in order from a light source side,
A light diffuser that spreads light from the light source evenly over a wide angle;
A dot line passing a light through an aim point pattern;
A group of field-of-view lenses including a lens having a positive refracting power as a whole to increase the resolution of the aimpoint image, widen the viewing angle, and reduce the overall length of the optical system;
The lens is a meniscus shaped concave toward the observer. The lens is made of a meniscus, which allows observation of the aim point pattern image from a long eye distance to a wide exit pupil. A coupler,
Wherein each lens group satisfies the following expression.
2.0 = F / f1 = 2.5
0.82 = F / f2 = 0.92
2.3 = f2 / f1 = 2.8
0.01 = D12 / F = 0.04
0.9 = D23 / F = 1.2
F2 is the effective focal length of the image coupler, F is the effective focal distance of the collimator lens, D12 is the distance between the field lens group and the reticle pattern, D23 is the distance between the image coupler and the field lens, Represents the distance between groups.)
The method according to claim 1,
And the optical axes of the image combiner and the view lens group are arranged in parallel to each other.
The method according to claim 1,
Wherein the collimation point pattern of the reticle is formed on a focal plane of the collimator lens system.
The method according to claim 1,
Wherein the reticle is made to transmit light by etching the reticle pattern to the metal coating at an intaglio angle.
The method according to claim 1,
Wherein the pattern of the net line is formed with at least two aiming points for a range of a distance.
The method according to claim 1,
And the aim point is moved by moving the reticle in up, down, left, and right directions.
The method according to claim 1,
And a diaphragm is further provided between the image coupler and the observer.

Images