A self-collimating dual red dot sight

Abstract

This invention discloses a self-collimating dual red dot sight, comprising a housing and a beam splitter prism mounted on the housing. One side of the beam splitter prism faces the object side, and the opposite side faces the target side. Beam expanders one and two are respectively arranged on opposite sides of the beam splitter prism. Beam expanders one and two are coaxially arranged, and their axes are perpendicular to the object-side incident axis of the beam splitter prism. A luminous reticle is located on the side of beam expander two away from the beam splitter prism. Beam expander one is a concave mirror, fixed inside the housing, used to expand the image of the luminous reticle so that it enters the beam splitter prism. Beam expander two is a plano-convex internal reflecting mirror, its flat end glued to the surface of the corresponding side of the beam splitter prism. The luminous reticle is mounted inside the housing via an adjustable mechanism. The housing has a channel for the image emitted by the luminous reticle to reach the beam splitter prism. The advantage of this invention is that it can effectively improve aiming accuracy.

Description

Technical Field

[0001] This invention relates to the field of aiming scope technology, and in particular to an autocollimating double red dot sight. Background Technology

[0002] Currently, red dot sights typically include a reticle, an off-center mirror, an objective lens, and an eyepiece. Some are open-type, without both the objective and eyepiece being sealed at both ends; simpler ones only have an off-center mirror. The reticle is located to the lower right of the off-center mirror axis. The reticle enters the off-center mirror at a certain angle from the eye side towards the object side. Under the action of the off-center mirror, a virtual image of the reticle is formed on the object side. The eye sees the target on the object side simultaneously with the virtual image of the reticle through the off-center mirror; when the two coincide, aiming is complete. Firing at this point theoretically results in a hit on the target whose image coincides with the reticle's virtual image, completing the aiming and firing process. This type of sight has low accuracy and poor system reliability. Therefore, there is an urgent need for a sight with better accuracy and higher aiming reliability. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide an autocollimating dual red dot sight to overcome the large aiming error of existing red dot sights that are not three-point aligned, thereby effectively improving aiming accuracy.

[0004] To solve the above-mentioned technical problems, the technical solution of the present invention is as follows:

[0005] A self-collimating dual red dot sight includes a housing and a beam splitter mounted on the housing; one side of the beam splitter faces the object side, and the opposite side faces the eye side; a beam expander first and a beam expander second are respectively arranged on opposite sides of the beam splitter; the beam expander first and the beam expander second are coaxially arranged, and the axes of the beam expander first and the beam expander second are perpendicular to the object-side incident axis of the beam splitter; a luminous reticle is provided on the side of the beam expander second away from the beam splitter.

[0006] The beam expander is a concave mirror, fixed inside the housing, used to expand the image of the luminous reticle so that it enters the beam splitter prism.

[0007] The second beam expander is a plano-convex internal reflecting mirror, with its planar end glued to the surface of the corresponding side of the beam splitter.

[0008] The luminous reticle is installed inside the housing via an adjustable mechanism; the housing has a channel for the luminous image emitted by the luminous reticle to reach the beam splitter.

[0009] As a preferred embodiment of this application, the adjustable mechanism includes a transverse block that is guided and installed inside the housing and can be adjusted to move laterally along the housing; an adjusting rod 1 threaded through the transverse block and rotatably connected to the housing at both ends; a lamp holder that is guided and installed on the transverse block and can be adjusted to move longitudinally along the transverse block; a longitudinal block 1 fixedly connected to the lamp holder; a longitudinal block 2 that is guided and installed inside the housing and can be adjusted to move laterally along the housing; an adjusting rod 2 threaded through the longitudinal block 2 and rotatably connected to the housing at both ends; and a longitudinal spring for pushing the lamp holder to move longitudinally; the adjacent surfaces of the longitudinal block 1 and the longitudinal block 2 are in contact and are inclined surfaces to each other; the luminous reticle lamp is installed on the lamp holder; the transverse block is provided with an opening slot for installing the lamp holder, and the two ends of the longitudinal spring are in contact with the opening slot and the lamp holder, respectively.

[0010] As a preferred technical solution of this application, the first adjusting rod is provided with a compression spring on one side of the transverse block, and the second adjusting rod is provided with a compression spring on one side of the longitudinal block.

[0011] As a preferred technical solution of this application, one end of the adjusting rod is provided with a limiting device. The limiting device includes a detachable nut connected to the housing for limiting the axial movement of the adjusting rod, a pin passing through that end of the adjusting rod, and a pin spring for providing pressure to the pin. The adjusting rod is provided with a stepped hole for mounting the pin and the pin spring. The inner wall of the nut is provided with a plurality of internal teeth, and the pin meshes with the internal teeth of the nut. One end of the adjusting rod is also provided with the limiting device.

[0012] As one of the preferred technical solutions of this application, a beam-splitting polarization film is coated on the inclined surface of one of the right-angle prisms of the beam-splitting prism; both the object-facing end face and the target-facing end face of the beam-splitting prism are coated with a visible light band anti-reflection film.

[0013] As one of the preferred technical solutions of this application, the housing is provided with a cavity for mounting the beam splitter prism; the cavity is provided with a detachable cover plate for pressing and fixing the beam expander and the beam splitter prism.

[0014] As one of the preferred technical solutions of this application, the housing is provided with a power supply device for supplying power to the luminous reticle lamp.

[0015] As a preferred technical solution of this application, the power supply device includes a battery inserted into the housing, a control switch for controlling the battery's on / off state, and a control circuit board electrically connected to the battery, the luminous reticle, and the control switch respectively; the housing is provided with a battery compartment for battery installation and a battery cover for sealing the battery compartment.

[0016] As one of the preferred technical solutions of this application, the entrance of the battery compartment is detachably connected to an annular battery connector, and the battery cover is detachably connected to the battery connector.

[0017] As one of the preferred technical solutions of this application, the luminous reticle light emits an image of a single independent red dot reticle, a crosshair reticle, a full circle reticle, or a semi-circular reticle for the four-wheel drive area; the beam splitter is formed by gluing together the inclined surfaces of two right-angled prisms at 45°.

[0018] The above technical solution has the following advantages:

[0019] This application employs a dual imaging mechanism to provide visual feedback, helping shooters quickly confirm whether their eye position is correct. This eliminates the aiming error (parallax) caused by eye position deviation in traditional single red dot sights, enabling more accurate shooting aiming than traditional red dot sights, especially in dynamic shooting or non-standard shooting postures. In addition, this structure does not require complex electronic rangefinding or mechanical focusing mechanisms, and can achieve self-collimation function solely by passive optical elements. It has the advantages of simple structure, high reliability, and no need for external energy to maintain optical performance. Attached Figure Description

[0020] Figure 1 An optical arrangement diagram of an autocollimating dual red dot sight provided for the example of this application;

[0021] Figure 2 for Figure 1 A schematic diagram of the optical principle of a self-collimating dual red dot sight is provided.

[0022] Figure 3 for Figure 1 A schematic diagram of a self-collimating dual red dot sight is provided.

[0023] Figure 4 for Figure 1 A schematic diagram of the structure of a self-collimating dual red dot sight is provided (from below).

[0024] Figure 5 for Figure 1 A schematic diagram of reticle adjustment for an autocollimating dual red dot sight is provided.

[0025] Figure 6 for Figure 1 A schematic diagram of the battery compartment of a self-collimating dual red dot sight is provided.

[0026] Figure 7 for Figure 1 A top view schematic diagram of an autocollimating dual red dot sight is provided.

[0027] In the picture:

[0028] 1-Illuminated reticle, 2-Beam expander one, 3-Beam splitter prism, 4-Beam expander two, 5-Reference reticle, 6-Auto-collision reticle, 7-Firing target, 8-Housing, 9-Horizontal movement block, 10-Adjusting rod one, 11-Longitudinal movement spring, 12-Lamp holder, 13-Lamp tube, 14-Pressure ring, 15-Longitudinal movement block one, 16-Longitudinal movement block two, 17-Cover plate, 18-Compression spring one, 19-Reticle nut, 20-Ejector pin, 21-Ejector pin spring, 22-Control switch, 23-Battery connector, 24-Battery cover, 25-Battery, 26-Adjusting rod two, 27-Compression spring two. Detailed Implementation

[0029] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings. It should be noted that these descriptions are for the purpose of aiding understanding the present invention, but do not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0030] Example 1

[0031] As attached Figure 1-7 As shown, a self-collimating dual red dot sight includes a housing 8 and a beam splitter 3 mounted on the housing 8. One side of the beam splitter 3 faces the object side, and the other side faces the target side. Beam expanders 2 and 4 are respectively arranged on opposite sides of the beam splitter 3. Beam expander 2 is used to compress the divergence angle of the point light source into a collimated beam, and beam expander 4 is used to receive the beam transmitted through the beam splitter 3 and reflect it back into the optical path to form a virtual image. Beam expanders 2 and 4 are arranged coaxially, and the axes of beam expanders 2 and 4 are perpendicular to the object-side incident axis of the beam splitter 3. This perpendicular arrangement effectively shortens the optical path folding length and reduces the overall volume of the sight. A luminous reticle 1 is arranged on the side of beam expander 4 away from the beam splitter 3. The luminous reticle 1 emits red light as a point light source.

[0032] The beam expander 2 is a concave mirror, fixed inside the housing 8, used to expand the image of the luminous reticle 1 so that it enters the beam splitter prism 3. The radius of curvature of the concave mirror is matched according to the distance between the luminous reticle 1 and the mirror surface and the required divergence angle of the emitted beam, so that the light emitted from the luminous reticle 1 is reflected to form an approximately parallel light or a collimated beam with a small divergence angle, thereby forming a clear real image at infinity on the human retina and avoiding parallax caused by eye accommodation.

[0033] The second beam expander 4 is a plano-convex internal reflecting mirror, with its planar end glued to the surface of the corresponding side of the beam splitter 3. The convex surface of the plano-convex internal reflecting mirror is coated with a high-reflectivity dielectric film or adopts the principle of total internal reflection to reflect the light transmitted through the beam splitter 3 back into the prism. The curved surface characteristics are used to perform secondary divergence processing on the light, so that when the reflected light returns to the beam splitter 3, it forms a virtual image with a specific parallax displacement relative to the reference real image. When the observer moves the line of sight, the virtual image is displaced relative to the distant target. By adjusting the optical parameters, the virtual image, the real image and the target are made to coincide at a specific aiming position, thereby realizing the self-collimation function.

[0034] The luminous reticle 1 is installed inside the housing 8 via an adjustable mechanism. By finely adjusting the position of the luminous reticle 1 in the X and Y axes, the angle of the light incident on the beam expander 2 is changed, thereby adjusting the position of the reference real image in the field of view and achieving zero-position calibration. The housing 8 has a channel for the luminous image emitted by the luminous reticle 1 to reach the beam splitter 3. The inner wall of the channel is coated with a light-absorbing material to eliminate stray light interference.

[0035] As a preferred technical solution in this embodiment, the adjustable mechanism includes a transverse block 9 that is guided and installed inside the housing 8 and can be adjusted laterally along the housing 8; an adjusting rod 10 threaded through the transverse block 9 and rotatably connected to the housing 8 at both ends; rotating the adjusting rod 10 drives the transverse block 9 to generate a precise linear displacement, realizing coarse and fine adjustments in the horizontal direction; a lamp holder 12 that is guided and installed on the transverse block 9 and can be adjusted longitudinally along the transverse block 9; a longitudinal block 15 fixedly connected to the lamp holder 12; a longitudinal block 26 that is guided and installed inside the housing 8 and can be adjusted laterally along the housing 8; an adjusting rod 26 threaded through the longitudinal block 26 and rotatably connected to the housing 8 at both ends; and a longitudinal spring 11 for pushing the lamp holder 12 to move longitudinally. The spring 11 provides preload to eliminate transmission backlash and ensure positional stability after adjustment. The adjacent surfaces of the first longitudinal moving block 15 and the second longitudinal moving block 16 are in contact and are inclined planes. Utilizing the wedge principle, the horizontal displacement of the second longitudinal moving block 16 is converted into the vertical displacement of the first longitudinal moving block 15 and the lamp holder 12, achieving a compact structure design with single-knob control and bidirectional linkage. Alternatively, two sets of orthogonally arranged independent lead screw and nut pairs can be used to control horizontal and vertical movement respectively, improving the decoupling of adjustment. The luminous reticle lamp 1 is mounted on the lamp holder 12, and the precise movement of the lamp holder 12 drives the change in the position of the light source. The transverse moving block 9 has an opening slot for mounting the lamp holder 12, and the two ends of the longitudinal moving spring 11 contact the opening slot and the lamp holder 12 respectively, forming an elastic reset structure. In this embodiment, the luminous reticle lamp 1 is mounted on the lamp tube 13 via a pressure ring 14, and the lamp tube 13 is then fixedly connected to the lamp holder 12.

[0036] As a preferred technical solution in this embodiment, the first adjusting rod 10 is provided with a compression spring 18 on one side of the transverse block 9, and the second adjusting rod 26 is provided with a compression spring 27 on one side of the longitudinal block 26. The first compression spring 18 and the second compression spring 27 respectively apply axial preload to the adjusting rod, eliminate the threaded fit clearance, prevent the adjustment amount from drifting due to vibration, and at the same time provide damping to improve the operating feel.

[0037] As a preferred technical solution in this embodiment, one end of the adjusting rod 10 is provided with a limiting device. The limiting device includes a detachable nut 19 connected to the housing 8 to limit the axial movement of the adjusting rod 10, a pin 20 passing through the end of the adjusting rod 10, and a pin spring 21 providing pressure to the pin 20. The engagement of the pin 20 and the nut 19 achieves gear locking, preventing accidental activation that could lead to zeroing failure. The adjusting rod 10 is provided with a stepped hole for mounting the pin 20 and the pin spring 21, facilitating axial positioning and assembly of the components. The inner wall of the nut 19 is provided with several internal teeth. The pin 20 engages with the internal teeth of the nut 19 to form a clutch structure. When the adjusting rod 10 is rotated, the pin 20 compresses the pin spring 21, causing the adjusting rod 10 to rotate. One end of the adjusting rod 26 is also provided with the aforementioned limiting device to ensure that both axes of adjustment have a locking function.

[0038] As a preferred technical solution in this embodiment, a beam-splitting polarization film is coated on the inclined surface of one of the right-angle prisms of the beam splitter 3 to ensure clear identification under different ambient light conditions; both the object-facing end face and the target-facing end face of the beam splitter 3 are coated with a visible light band anti-reflection film to reduce surface reflection loss, improve the overall transmittance of the optical system, and a hydrophobic and oleophobic layer can be doped into the anti-reflection film to enhance environmental adaptability.

[0039] As a preferred technical solution in this embodiment, the housing 8 is provided with a cavity for mounting the beam splitter 3. The dimensional accuracy of the cavity matches the shape of the beam splitter 3 to ensure the coaxiality of the optical axis. The cavity is provided with a detachable cover plate 17 for pressing and fixing the beam expander 4 and the beam splitter 3. An O-ring can be provided between the cover plate 17 and the housing 8 to achieve dustproof and waterproof function, or an adhesive curing method can be used as an alternative fixing scheme to further simplify the structure.

[0040] As a preferred technical solution in this embodiment, the housing 8 is provided with a power supply device for supplying power to the luminous reticle lamp 1. The power supply device needs to have a voltage stabilization output function to meet the requirement of constant brightness when the battery voltage 25 drops. The power supply device can be built into the housing 8, externally mounted on the housing 8, or powered by an independent power source.

[0041] As a preferred technical solution in this embodiment, the power supply device includes a battery 25 inserted into the housing 8, a control switch 22 for controlling the on / off state of the battery 25, and a control circuit board (not shown in the figure) electrically connected to the battery 25, the luminous reflector 1, and the control switch 22 respectively. The control circuit board integrates a constant current drive chip for precisely controlling the current of the luminous reflector 1 to avoid overcurrent damage or brightness fluctuations. The housing 8 is provided with a battery compartment for installing the battery 25 and a battery cover 24 for sealing the battery compartment. Conductive springs can be provided inside the battery compartment to ensure good contact.

[0042] As a preferred technical solution in this embodiment, an annular battery connector 23 is detachably connected to the entrance of the battery compartment, and the battery cover 24 is detachably connected to the battery connector 23. The cover is tightened by screwing to achieve a seal. A waterproof gasket can be provided between the battery connector 23 and the housing 8, or a magnetic quick-release structure can be used as an alternative to improve the convenience of replacing the battery 25.

[0043] As a preferred technical solution in this embodiment, the luminous reticle 1 emits an image that is a single independent red dot reticle, a crosshair reticle, a full circle reticle, or a semi-circular reticle in the four-wheel drive area. Different reticle shapes can be achieved by setting a mask plate in front of the luminous reticle 1 or by directly using patterned LED chips to meet the needs of different shooting scenarios. The beam splitter prism 3 is made of two right-angled prisms with a 45° angle bonded together. The adhesive is an optical adhesive with a matching refractive index and strong weather resistance to ensure that it does not delaminate or deform under high and low temperature environments.

[0044] The autocollimating dual red dot sight of this application, through polarization-state beam-splitting coating technology on the cemented surfaces of two right-angle prisms, enables the beam splitting line generated by the light-emitting beam splitter lamp to ( Figure 2The light rays pass through beam expander 2 and enter beam splitter prism 3. A portion of the light is reflected at 90° and exits the prism parallel to the eye, where a fixed, reference-emitting real image is seen. This image serves as the primary aiming reference point and does not shift relative to the target with eye movement. The other portion continues forward and strikes beam expander 4, a plano-convex internal reflecting mirror. It undergoes total internal reflection at its reflecting surface, returning to the prism's cemented surface. After a 90° reflection, the light reaches the inner surface of the object-side image prism, where it is refracted 180° and reflected back, exiting from the eye-side to form a secondary magnified virtual image of the reticle. This virtual image's optical path design utilizes the geometric relationship between the curvature center and the beam splitter point of beam expander 4, creating a linkage between the virtual image's position and the pupil's position. This virtual image moves up, down, left, and right depending on the eye's viewing angle. Simultaneously, the eye-side will see the object-side target through the prism, and the reticle... The system combines a fixed real image from the reticle and a secondary virtual image from the reticle. Through optical design, when the user's eye is centered on the optical axis, the virtual image coincides with the real image. When the user's eye deviates from the optical axis, the virtual image shifts relative to the real image and the target. The operator can fine-tune their head position to make these three points coincide. The moving virtual image of the reticle, the target, and the fixed real image of the reference reticle 5 coincide, achieving the principle of three points in a straight line for aiming. This dual imaging mechanism provides visual feedback, helping the shooter quickly confirm whether their eye position is correct. It eliminates the aiming error (parallax) caused by eye position deviation in traditional single red dot sights, enabling more accurate shooting than traditional red dot sights, especially in dynamic shooting or non-standard shooting postures. In addition, this structure does not require complex electronic rangefinders or mechanical focusing mechanisms; it achieves self-collimation function solely through passive optical elements. It has the advantages of simple structure, high reliability, and no need for external energy to maintain optical performance.

[0045] In the description of the above embodiments, for the sake of brevity and clarity, some components and their specific structural details that are not directly related to the core innovations of this invention have been omitted. These omitted parts all fall within the scope of existing technology, and those skilled in the art can fully implement the design and manufacture of these parts based on their professional knowledge and existing technical materials. Therefore, they will not be described in detail here.

[0046] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and these variations still fall within the protection scope of the present invention.

Claims

1. A self-collimating dual red dot sighting telescope, comprising a housing (8), and a light splitting prism (3) mounted on the housing (8); one side of the light splitting prism (3) faces the object side, and the other side opposite to it faces the eye side; characterized in that: The spectrometer prism (3) is provided with an expander mirror one (2) and an expander mirror two (4) on opposite sides respectively; the expander mirror one (2) and the expander mirror two (4) are coaxially arranged, and the axis of the expander mirror one (2) and the expander mirror two (4) is perpendicular to the object side incident axis of the spectrometer prism (3); the expander mirror two (4) is provided with a light scale lamp (1) on the side away from the spectrometer prism (3); The expander mirror one (2) is a concave mirror, which is fixedly connected in the shell (8) and used for expanding the image of the light scale lamp (1) to make it enter the spectrometer prism (3); The expander mirror two (4) is a flat-convex internal reflection mirror, and the flat end thereof is glued to the surface of the corresponding side of the spectrometer prism (3); The light scale lamp (1) is installed in the shell (8) through an adjustable mechanism; the shell (8) has a channel for the light emitting image of the light scale lamp (1) to reach the spectrometer prism (3).

2. The self-coUimating dual red dot riflescope of claim 1, wherein: The adjustable mechanism comprises a transverse moving block (9) which is guidedly installed in the shell (8) and can move transversely along the shell (8) for adjustment, an adjusting rod one (10) which is threadedly provided on the transverse moving block (9) and rotationally connected with the shell (8) at both ends, a lamp holder (12) which is guidedly installed on the transverse moving block (9) and can move longitudinally along the transverse moving block (9) for adjustment, a longitudinal moving block one (15) which is fixedly connected with the lamp holder (12), a longitudinal moving block two (16) which is guidedly installed in the shell (8) and can move transversely along the shell (8) for adjustment, an adjusting rod two (26) which is threadedly provided on the longitudinal moving block two (16) and rotationally connected with the shell (8) at both ends, and a longitudinal moving spring (11) for pushing the lamp holder (12) to move longitudinally; the longitudinal moving block one (15) and the longitudinal moving block two (16) are in surface contact and are inclined surfaces with respect to each other; the light scale lamp (1) is installed on the lamp holder (12); the transverse moving block (9) is provided with an open slot for installing the lamp holder (12), and the two ends of the longitudinal moving spring (11) are in contact with the open slot and the lamp holder (12) respectively.

3. The self-coUimating dual red dot riflescope of claim 2, wherein: The adjusting rod one (10) is provided with a compression spring one (18) on one side of the transverse moving block (9), and the adjusting rod two (26) is provided with a compression spring two (27) on one side of the longitudinal moving block two (16).

4. The self-coUimating dual red dot sight of claim 2 or 3, wherein: One end of the adjusting rod one (10) is provided with a limiting device, the limiting device comprises a scale nut (19) which is detachably connected to the shell (8) and used for limiting the axial movement of the adjusting rod one (10), a thimble (20) which is provided on the end of the adjusting rod one (10), and a thimble spring (21) for providing pressure to the thimble (20); the adjusting rod one (10) is provided with a stepped hole for installing the thimble (20) and the thimble spring (21); the inner wall of the scale nut (19) is provided with a plurality of internal teeth, and the thimble (20) is engaged with the internal teeth of the scale nut (19); one end of the adjusting rod two (26) is also provided with the limiting device.

5. The self-coUimating dual red dot sight of any of claims 1-3, wherein: The inclined surface of one of the right-angle prisms of the spectrometer prism (3) is coated with a spectrometer polarization spectrometer film; the end surface of the spectrometer prism (3) facing the object side and the end surface facing the eye side are both coated with a visible light wave band anti-reflection film.

6. The self-coUimating dual red dot sight of any of claims 1-3, wherein: The housing (8) is provided with a cavity for installing the beam splitter (3); the cavity is provided with a detachable cover plate (17) for pressing and fixing the beam expander (4) and the beam splitter (3).

7. The self-coUimating dual red dot sight of any of claims 1-3, wherein: The housing (8) is provided with a power supply device for supplying power to the luminous reticle lamp (1).

8. The self-coUimating dual red dot sight of claim 7, characterized in that: The power supply device includes a battery (25) inserted into the housing (8), a control switch (22) for controlling the on and off of the battery (25), and a control circuit board that is electrically connected to the battery (25), the luminous reticle (1) and the control switch (22) respectively; the housing (8) is provided with a battery compartment for installing the battery (25) and a battery cover (24) for closing the battery compartment.

9. The self-luminous dual red dot sight according to claim 8, characterized in that: The entrance to the battery compartment is detachably connected to an annular battery connector (23), and the battery cover (24) is detachably connected to the battery connector (23).

10. The self-coUimating dual red dot sight of any of claims 1-3, wherein: The luminous reticle (1) emits a single independent red dot reticle, a crosshair reticle, a full circle reticle, or a semi-circular reticle in the four-wheel drive area; the beam splitter (3) is formed by gluing together the inclined surfaces of two right-angled prisms at 45°.

Images