LV12878B - Parallax free reflective optical sighting system - Google Patents

Abstract

The present invention relates to reflective optical sighting systems for small firearms. As shown in fig.1, parallax free reflective optical sighting system according to the present invention comprises a light source (1) and a correcting concavo-convex lens (2) located outside of the optical channel (5). A plano-convex lens (3) having a semi-transparent mirror layer on its convex surface and a plano-concave lens (4) are mutually aligned and fixed, in fact forming a simple substantially plane-parallel plate made of an optical material. The mutually fixed lenses (3 and 4) are located within the optical channel (5) and directed at an angle with its axis. The correcting concavo-convex lens (2) is directed at an angle with the axis of the optical channel (5) compensating the distortions caused by the oblique direction of the mutually fixed lenses (3 and 4).

Description

LV 12878

Parallax free reflective optical sighting system

The present invention relates to reflective optical sighting systems for small firearms.

From the US Patent No. 5,189,555 there is known a parallax free optical sighting device which comprises an optical system with a parabolic shaped mirror, which provides an absolutely parallax free system, as a parabolic shaped surface has a well defined focal point.

Hovvever, technical implementation of this system is very difficult and therefore expensive.

From the US Patent No. 4,402,605, which is considered as the closest prior art for the present invention, there is known an optical sighting instrument vvhich has a sighting axis and comprises a housing having forvvard and rear apertures and a lēns system supported vvithin the housing, the lēns system comprising lēns means and a concave, substantially spherical semi-transparent mirror surface facing the rear aperture, the focal point of the mirror being located betvveen the mirror surface and the rear aperture, the sighting instrument further comprising a light source in the form of a small light emitting diode directed tovvards the concave mirror surface for generating a sighting mark vvhich seems, to an eye from behind the rear aperture of the housing, to lie at a great distance in front of the sight, the lēns system including a first lēns device in vvhich the mirror surface is included as a part and vvhich has a predetermined refraction, and a refraction redressing second lēns device vvhich renders the entire lēns system substantia!ly zero-refractive.

The first lēns device vvhich is reducing and fixedly disposed in the housing comprises a concave-convex lēns and a plano-concave lēns, the plano-concave lēns being interconnected with the convex surface of the concave-convex lēns so that the both lenses together form a plano-concave lēns having a semi-transparent mirror surface integrated therein. The second lēns device is magnifying and has the form of a plano-convex lēns positioned so as to have its planar surface spaced from the planar surface of the first lēns device and facing the latter.

Hovvever, this system is zero-refractive only if the aiming object is observed vvhen a looking eye is located on the optical axis of the lēns system, but vvhen the 2 eye becomes displaced from the optical axis of the lēns system, the lēns system is no more zero-refractive, a distortion of the system appears, vvhich makes it impossible to use the system when the both eyes are open, which in turn causes restriction of the field of view of the sighting system. This is due to the fact that the second lēns device, responsible for refraction redressing, is located in the field of sighting.

This problem is solved in the present invention vvhich allovvs taking aim with the both eyes open vvithout any restrictions, vvhich significantly vvidens the field of view of the system.

The present parallax free reflective optical sighting system comprises a lēns system vvhich has a concavo-convex lēns, a plano-concave lēns and a plano-convex lēns; a semi-transparent concave mirror surface located betvveen the concave surface of the plano-concave lēns and the convex surface of another lēns and a substantially point light source located outside of the optical channel and directed tovvards the concave mirror surface for generating a sighting mark vvhich seems for an eye looking from the rear side of the optical system as located at a great distance in front of the sight. According to the present invention, the plano-convex lēns with a semi-transparent layer on its convex surface and the plano-concave lēns vvhich has the same radius and refraction index as the plano-convex lēns, are brought into mutual alignment with their spherical surfaces and permanently fixed together, so that they form substantially a simple plane-parallel plate made of an optical material, this mutually fixed lenses being directed at an angle with the axis of the optical channel, and the concavo-convex lēns is used as a correcting lēns and is located outside of the optical channel betvveen the light source and the mutually fixed lenses at an angle vvith the axis of the optical channel, so that there are compensated the distortions caused by the oblique direction of the mutually fixed lenses.

In another embodiment of the present invention, a parallax free reflective optical system comprises a lēns system vvhich has a plano-concave lēns and a plano-convex lēns, a semi-transparent concave mirror surface located betvveen the concave surface of the plano-concave lēns and the convex surface of another lēns and a substantially point light source located outside of the optical channel and intended for generating a sighting mark vvhich seems to be located at a great distance for an eye looking from the rear side of the optical system. According to the 3 LV 12878 present invention, the plano-convex lēns with the semi-transparent mirror surface on its convex surface and the plano-concave lēns which has the same radius and refraction index as the plano-convex lēns are brought into mutual alignment with their spherical surfaces and permanently fixed together, so that they form substantially a simple plane-parallel plate made of an optical material, and outside of the optical channel, behind the light source, there is located a correcting element which constitutes a concave mirror directed tovvards the light source and the mutually fixed lenses and directed at an angle with the axis of the optical channel, so that there are compensated the distortions caused by the oblique direction of the mutually fixed lenses.

Due to the fact that the correcting lēns (correcting element) is located outside the optical channel, what remains within the optical channel are the mutually fixed lenses forming in fact a simple substantially plane-parallel plate vvhich does not distort the image of the aiming object at ali, even when the eye is significantly displaced from the axis of the optical system. This allovvs taking aim with the both eyes open vvithout any restrictions, which significantly widens the field of view of the system.

BRIEF DESCRIPTION OF THE DRAVVINGS

Fig. 1 is a longitudinal cross section of a parallax free reflective optical sighting system according to the present invention with a concavo-convex lēns used as a correcting element.

Fig. 2 is a longitudinal cross section of a parallax free reflective optical sighting system according to the present invention with a concave mirror used as a correcting element.

Example 1

The parallax free reflective optical sighting system shown in Fig. 1 comprises a light source 1 in the form of a diaphragmed light emitting diode, a correcting concavo-convex lēns 2 directed tovvards the light source 1 with its convex surface and a plano-convex lēns 3 and a plano-concave lēns 4 vvhich are made of the same 4 optical material, brought into mutual alignment vvith their spherical surfaces and permanently fixed (glued) together, the plano-convex lēns 3 having a semi-transparent mirror layer on its convex surface.

The light source 1 and the correcting concavo-convex lēns 2 are located outside of the optical channel 5. The plano-convex lēns 3 and plano-concave lēns 4 vvhich are brought into mutual alignment with their spherical surfaces and permanently fixed together in fact form a simple substantially plane-parallel plate made of an optical material. The mutually fixed lenses 3 and 4 are located within the optical channel 5 and directed at an angle with its axis. The correcting concavo-convex lēns 2 is directed at an angle with the axis of the optical channel 5, vvhich provides compensation of the distortions caused by the oblique direction of the mutually fixed lenses 3 and 4.

The light rays emitted by the light source 1 pass the correcting concavo-convex lēns 2 being refracted therein, pass the plano-convex lēns 3 being refracted therein, are reflected from the semi-transparent mirror surface, pass the lēns 3 in the opposite direction being refracted therein, and exit therefrom as a beam 6 parallel to the axis of the optical channel 5. At the same time, the light rays from the aiming object 7 pass the mutually fixed lenses 3 and 4 vvithout any distortion. Thus, the image of the point light source 1 is superposed onto the image of the aiming object 7.

Example 2

The parallax free reflective optical sighting system shown in Fig. 2 comprises a light source 1 in the form of a diaphragmed light emitting diode and a plano-convex lēns 3 and a plano-concave lēns 4 vvhich are made from the same optical material, brought into mutual alignment with their spherical surfaces and permanently fixed (glued) together, the plano-convex lēns 3 having a semi-transparent mirror layer on its convex surface. A correcting concave mirror 8 is located behind the light source 1 directed tovvards the light source 1 with its concave surface.

The light source 1 and correcting concave mirror 8 are located outside of the optical channel 5. The plano-convex lēns 3 and plano-concave lēns 4 vvhich are brought into mutual alignment vvith their spherical surfaces and permanently fixed 5

Lv 12878 together in fact form a simple substantially plane-parallel plate made of an optical material. The mutually fixed lenses 3 and 4 are located vvithin the optical channel 5 and directed at an angle with its axis. The correcting concave mirror 8 is directed at an angle with the axis of the optical channel 5, vvhich provides compensation of the distortions caused by the oblique direction of the mutually fixed lenses 3 and 4.

The light rays emitted by the light source 1 are reflected from the concave mirror 8, pass the plano-convex lēns 3 being refracted therein, are reflected from the semi-transparent mirror surface, pass the lēns 3 in the opposite direction being refracted therein and exit therefrom as a beam 6 parallel to the axis of the optical channel 5. At the same time, the light rays from the aiming object 7 pass the mutually fixed lenses 3 and 4 vvithout any distortions. Thus, the image of the point light source 1 is superposed onto the image of the aiming object 7.

Abstract

The present invention relates to reflective optical sighting systems for small firearms. As shown in Fig. 1, a parallax free reflective optical sighting system according to the present invention comprises a light source 1 and a correcting concavo-convex lēns 2 located outside of the optical channel 5. A plano-convex lēns 3 having a semi-transparent mirror layer on its convex surface and a plano-concave lēns 4 are mutually aligned and fixed in fact forming a simple substantially plane-parallel plate made of an optical material. The mutually fixed lenses 3 and 4 are located vvithin the optical channel 5 and directed at an angle with its axis. The correcting concavo-convex lēns 2 is directed at an angle with the axis of the optical channel 5 compensating the distortions caused by the oblique direction of the mutually fixed lenses 3 and 4. 6 LV 12878

What is claimed is: 1. A parallax free reflective optical sighting system comprising a lēns system having a concavo-convex lēns, a plano-concave lēns and a plano-convex lēns; a semi-transparent concave mirror surface located betvveen the concave surface of the plano-concave lēns and the convex surface of another lēns and a substantially point light source located outside of the optical channel and directed towards the concave mirror surface for generating a sighting mark vvhich seems to be located at a great distance in front of the sight for an eye looking from the rear side of the optical system, characterizing in that the plano-convex lēns with the semi-transparent mirror layer on its convex surface and the plano-concave lēns vvhich has the same radius and refraction index as the plano-convex lēns are mutually brought into alignment with their spherical surfaces and permanently fixed together, so that they form substantially a simple plane-parallel plate made of an optical material, the mutually fixed lenses being directed at an angle with the axis of the optical channel, the concavo-convex lēns being used as a correcting element and located outside of the optical channel betvveen the light source and the mutually fixed lenses directed at an angle with the axis of the optical channel, the angle compensating the distortions caused by the oblique direction of the mutually fixed lenses. 2. A parallax free reflecting optical sighting system comprising a lēns system having a plano-concave lēns and a plano-convex lēns; a semi-transparent concave mirror surface located betvveen the concave surface of the plano-concave lēns and the convex surface of another lēns and a substantially point light source located outside the optical channel for generating a sighting mark vvhich seems to be located at a great distance in front of the sight for an eye looking from the rear side of the optical system, characterizing in that the plano-convex lēns with the semi-transparent mirror surface on its convex surface and the plano-concave lēns vvhich has the same radius and refraction index as the plano-convex lēns are mutually brought into alignment with their spherical surfaces and permanently fixed together, so that they form substantially a simple plane-parallel plate made of an optical material, the mutually fixed lenses being directed at an angle with the axis of the optical channel, and a 7 concave mirror used as a correcting element is located outside of the optical channel behind the light source directed tovvards the light source and the mutually fixed lenses at an angle with the axis of the optical channel, the angle compensating the distortions caused by the obligue direction of the mutually fixed lenses.

Claims (2)

EN 12878 DESCRIPTION OF THE INVENTION 1. A non-parallel spectral reflective optical system comprising a lens system incorporating a concave curved lens, a concave lens, and a curved flat lens, a semi-permeable concave mirror surface positioned between the concave surface of the flat concave lens and the curved surface of the other lens, and a point light source positioned outside the optical channel facing the concave mirror surface, which, for the purpose of creating a sighting sign, which appears to the eye from the rear of the optical system, is positioned at a great distance in front of the sights, such that the flat curved lens with a semi-transparent lens a mirror surface on a curved surface and a flat concave lens having the same radius and refractive index as a flat convex lens, are joined to the spherical surfaces and fixed rigidly, essentially forming a plain-planar parallel to the optical material, with the fastened latch. placed at an angle to the axis of the optical channel, while the concave curved lens is used as a corrective element and positioned outside the optical channel of the system between the light source and the attached lenses at an angle to the axis of the optical channel that compensates for the distortion caused by the tilt angle of the lenses. 2. A non-parallel sights reflective optical system incorporating a lens system incorporating a concave flat lens and a curved flat lens, a semi-perpendicular concave mirror surface positioned between the concave surface of the flat concave lens and the convex surface of the other lens, and a spot-light source positioned outside the optical lens. the channel and facing the concave mirror surface, which, for the purpose of creating a sighting sign, which appears to the eye from the rear of the optical system, is positioned at a great distance in front of the sights, with the flat curved lens having a semi-translucent mirror surface on the curved surface and a flat concave lens having the same radius and refractive index as a flat curved lens, are connected to the spherical surfaces and fixed rigidly, essentially forming a plain plate of optical material, with the attached lenses positioned at an angle to the axis of the optical channel, The mirror is used as a corrective element and positioned outside the optical channel of the system between the light source and the attached lenses at an angle to the axis of the optical channel that compensates for the distortion caused by the angle of inclination of the fastened lenses.