Weapon sight

Abstract

An open sight for use on weapons such as handguns is disclosed. The open sight features two rear aiming marks mounted in the rear sight and a third aiming mark in the front sight. The aiming marks are illuminated by one or more artificial light sources disposed within the rear sight. The artificial light sources project light forward to the front sight and illuminate the rear aiming marks. The front sight is dimensioned to substantially block the forward directed beam to reduce the visibility of the illumination forward of the weapon.

Claims

1. An open sight for use on a weapon such as a handgun, the open sight comprising: (A) a rear sight comprising: (a) a housing; (b) at least one rear sight aiming mark; (c) one or more illumination sources disposed within the housing and configured, in use, to: (i) project light forward from the rear sight; and (ii) illuminate the at least one rear sight aiming mark; and (B) a front sight comprising a rearward facing reflective surface configured, in use, to at least partially reflect light emitted from the one or more illumination sources that is incident on the reflective surface back toward the rear sight; wherein the one or more illumination sources project light from the rear sight through an air gap between the housing of the rear sight and the front sight and onto the rearward facing reflective surface.

2. The open sight of claim 1 wherein the one or more illumination sources comprise: (A) at least one first illumination source that projects light forward from the rear sight; (B) at least one second illumination source that illuminates the at least one rear sight aiming mark.

3. The open sight of claim 1 wherein the one or more illumination sources are configured, in use, to project light backward from the rear sight through the at least one rear sight aiming mark.

4. The open sight of claim 1 wherein the rear sight comprises a body, at least two projections extending upward of the body, at least two aiming marks on the at least two projections, wherein the one or more illumination sources are configured, in use, to project light backward from the rear sight through the at least two aiming marks, wherein the at least two projections are laterally spaced to define a notch between them that, in use, allows a user to sight the front sight through the notch and laterally align the front sight with the at least two aiming marks.

5. The open sight of claim 4 wherein the one or more illumination sources comprise at least one illumination source for each of the at least two aiming marks.

6. The open sight of claim 4 comprising a light pipe comprising a receiving end for receiving light from the one or more illumination sources and at least two exit ends adjacent the at least two aiming marks, wherein, in use, light conveyed through the light pipe from the one or more illumination sources is projected rearward through the at least two aiming marks.

7. The open sight of claim 6 wherein the light pipe comprises a forward exit end for projecting light forward from the rear sight.

8. The open sight of claim 1 wherein the reflective surface comprises a diffuse reflective surface.

9. The open sight of claim 1 wherein the one or more illumination sources comprise at least one artificial light source that produces a forward directed beam of visible incoherent light.

10. The open sight of claim 9 wherein a width and a height of the beam is smaller than a width and a height of the front sight such that front sight blocks the beam forward of the front sight.

11. The open sight of claim 9 wherein, in use, the front sight is disposed to block a longitudinal axis of the forward directed beam.

12. A rear sight of an open sight for use on a weapon such as a handgun, the rear sight comprising: (A) a housing comprising: (a) an internal cavity; (b) a longitudinal length having a front end and rear end; (B) one or more illumination sources disposed within the cavity and configured to project light forward from the rear sight into an air gap outside the housing; (C) first and second projections extending upward of the housing, the projections defining a sighting notch; (D) each of the first and second projections comprising an illuminated aiming mark illuminated by the one or more illumination sources, the illuminated aiming marks projecting light rearward of the rear end.

13. The rear sight of claim 12 wherein the at least one first illumination source projects a longitudinal beam along a longitudinal axis of the rear sight.

14. The rear sight of claim 12 comprising a light pipe comprising: (A) a receiving end that receives light from the one or more illumination sources; and (B) at least two exit ends that terminate adjacent the aiming marks; wherein the light pipe conveys light from the receiving end to the at least two exit ends.

15. The rear sight of claim 14 wherein the light pipe comprises a forward exit end for projecting light forward from the rear sight.

16. An open sight for use on a weapon, the open sight comprising: (A) rear sight means and front sight means for aiming the weapon at a target; (B) the rear sight means comprising: (a) aiming mark means for aligning with the front sight means; and (b) illumination means for illuminating the front sight means and the aiming mark means, wherein the illumination means projects light forward of the rear sight means into an air gap between the rear sight means and the front sight means; and (C) the front sight means comprising rearward facing reflective means for reflecting light from the illumination means.

17. The open sight of claim 16 wherein the reflective means comprises diffuse reflective means.

18. The open sight of claim 16 comprising light pipe means for conveying light from the illumination means to the aiming mark means.

19. The open sight of claim 18 wherein the comprises light pipe means conveys light forward to a forward exit end for projecting light forward from the rear sight means.

20. The open sight of claim 16, the rear sight means comprising projection means that defines a sighting notch, the aiming mark means disposed on the projection means.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a perspective view showing the rear sight and the front sight according to the invention.

(2) FIG. 2 is a side view showing the rear sight and the front sight being mounted on a handgun. This figure shows how the light source in the rear sight illuminates the front sight and how the shooter views the light reflected back from the front sight through an opening (notch) in the rear sight.

(3) FIG. 3 is a perspective view showing the rear sight and the front sight being mounted on a handgun. This figure shows how the light source in the rear sight illuminates the front sight and how the front sight blocks the light beam from being visible to a viewer located directly in front of the handgun.

(4) FIG. 4 is a top view of the rear sight wherein Light Emitting Diodes (LEDs) are used as illumination sources.

(5) FIG. 5 is a top view showing a variation of the invention wherein a front-facing LED is used to illuminate the front aiming mark and a rear-facing Led is used to illuminate the rear aiming marks indirectly via a light pipe.

(6) FIG. 6 is a perspective view showing a variation of the invention wherein a rear-facing LED is used to illuminate the rear aiming marks indirectly via a light pipe.

(7) FIG. 7 is a perspective view of a variation of the invention wherein circular shapes are painted around the rear aiming marks using high-visibility paint.

(8) FIG. 8 is a top view showing a variation of the invention wherein a single LED is used to illuminate the front aiming mark and the rear aiming marks indirectly via a light pipe.

DESCRIPTION OF CERTAIN EMBODIMENTS OF THE PRESENT INVENTION

(9) In the following detailed description of the preferred embodiments, reference is made to the accompanying drawings, which form a part of this application. The drawings show, by way of illustration, specific embodiments in which the invention may be practiced. It is to be understood that other embodiments may be utilized and structural changes may be made without departing from the scope of the present invention.

(10) Glossary of Key Terms and Reference Numerals

(11) To help the reader understand the invention better, the names of main components of the invention and their corresponding reference numerals are listed below. 1. Rear Sight 2. Front sight 3. Opening (notch) 4. First artificial light source 5. First aiming mark (rear sight) 6. Second aiming mark (rear sight) 7. Third aiming mark (front sight) 10. Light beam emerging from the artificial light source 11. Light beam reflected from the front sight 14. Second artificial light source 15. Light pipe 21. Battery cover 25, 26. high-visibility circular aiming marks

(12) The open sight according to the present invention comprises a rear sight (1) and a front sight (2) (See, e.g., FIG. 1.) The rear sight (1) is mounted on the top surface of a handgun's receiver close to its rear end. The front sight (2) is mounted on the top surface of the receiver close to the muzzle end (FIG. 2 or 3).

(13) The rear sight (1) has a substantially hollow body (12) that includes electronic components to be described below including one or more illumination sources, a power source (e.g. battery), switches and associated circuitry. The internal cavity (13) of the rear sight (1) may be accessed via a removable battery cover (21). In one embodiment, the battery may be a 3 Volt CR2032 lithium battery. In one embodiment, the battery may be a rechargeable battery that is rechargeable via a charging port, such as a micro-USB port. Other batteries will be apparent to the person skilled in the art and will depend on the illumination sources and other components utilized, as will be described in more detail below.

(14) Externally, the housing body (12) of the rear sight (1) has a length extending along a longitudinal axis between a front end (28) and a rear end (27). The terms longitudinal, front, rear, etc. are used herein with reference to the weapon on which the sight will be deployed, rather than to the particular shape and configuration of the housing body 12. That is, a weapon has an apparent longitudinal axis, front end and rear end, as would be understood by the person skilled in the art and the rear sight has a corresponding front, rear and longitudinal axis. The housing body (12) is substantially rectangular with a low profile sufficient for housing the battery and electronics. The lower surface of the housing may be provided with one or more formations (19), such as a laterally extending wedge shown in FIG. 1, that enable the rear sight to be secured to a handgun. The size, shape and position of any such formations will be dependent on the type of weapon on which the rear sight is to be deployed.

(15) Extending upward of a top surface of the housing body are two projections (16), (17) that define a sighting notch (3) between them through which the front sight may be sighted in use. Disposed within these projections (16), (17), the rear sight comprises two aiming marks (5) and (6) formed as openings in the housing body. The aiming marks may be circular in shape and may be illuminated as described later in the specification. The front sight comprises a third aiming mark (7). The rear sight (2) includes an opening or notch (3) between the aiming marks (5) and (6) such that the front aiming mark (7) will be visible when viewed from a position behind the weapon with the shooter's eye being positioned at the same height as the top surface of the receiver.

(16) To aim the weapon, the shooter must laterally align the rear aiming marks (5) and (6) with the front aiming mark (7) and, additionally, hold the weapon such that the front aiming mark (7) is aligned with the target.

(17) A key feature of the present invention is that the rear aiming marks (5) and (6) are illuminated using one or more artificial light sources inside the rear sight and the front aiming mark (7) is illuminated indirectly via a forward-facing artificial light source also mounted in the rear sight.

(18) With reference to FIGS. 4 and 5 which show internal views of the rear sight (1) in alternative embodiments, an incoherent artificial light source (4) is positioned in the front section of the housing cavity (13) of the rear sight (1) such that it emits a visible light beam (10) into the air gap between the rear sight (1) and front sight (2) and towards the front sight (2). The artificial light source (4) can be a Light Emitting Diode (LED) or any other suitable electrical light source that emits an incoherent light beam. (That is, a light beam with frequent and random changes of phase between the photons.) This includes tungsten filament lamps and ordinary fluorescent tubes which emit incoherent visible light.

(19) A portion of the light beam (10) is reflected back towards the shooter's eye forming the reflected light beam (11). This beam is visible to the shooter through the opening (3) formed in the rear sight (1) between the sighting projections (16), (17). The height and the width of the light beam (10) and the dimensions of the front sight (2) are chosen such that the light beam emerging from the light source (4) is not visible to an adversary located directly in front of the gun's muzzle. FIG. 3 shows how the light source in the rear sight illuminates the front sight and how the front sight blocks the direct longitudinal light beam (10) from the light source. This reduces the degree to which light from the rear sight may be visible to a viewer located directly in front of the handgun.

(20) The third (front) aiming mark (7) comprises a diffuse reflective surface. Diffuse reflection is the reflection of light from a surface such that a ray incident on the surface is scattered at many angles rather than at just one angle as in the case of a mirror. A surface built from a non-absorbing powder such as plaster, or from fibers such as paper, or from a polycrystalline material such as white marble, reflects light diffusely with great efficiency. Persons skilled in the art would be familiar with diffuse reflection and can choose a suitable reflective material to be used in the front sight.

(21) The open sight disclosed in this invention has several advantages: No battery or illumination device is needed in the front sight All electronic components are contained within the rear sight No need to run fiber optic cables or electrical wires to illuminate the front site. This makes the illuminated sight introduced in this invention easily adaptable to handguns with different barrel lengths. In contrast to laser sights, the light beam is not visible by the adversary. The front-facing light source mounted in the rear sight may also illuminate the top surface of the receiver with a faint glowing light making the handgun more visible and easier to aim in low-light conditions.

(22) The aiming marks in the rear sight can be illuminated in several ways:

(23) In a first preferred embodiment of the invention, the illuminated aiming marks (5) and (6) are simply formed by additional artificial light sources (LEDs, for example) mounted in the rear sight (FIG. 4). While LEDs are preferred, it is possible to use any other suitable electrical light source that emits an incoherent light beam.

(24) The power of the LEDs should be chosen so as to provide adequately visible aiming marks during low light conditions while not being so bright that they obstruct the user's view of the target.

(25) In a second preferred embodiment of the invention (FIG. 5), a second artificial light source (14) is used to illuminate both rear aiming marks via a light pipe (15). The second artificial light source (14) is preferably an LED. It can also be made from any other electrical light source that emits an incoherent light beam. The light pipe (15) may be made from acrylic, glass or other suitable material. The light pipe (15) is positioned inside the rear sight (1) such that its receiving end is close to the second artificial light source (14). The light pipe (15) has two exit ends. These exit ends form the aiming marks (5) and (6) and are visible to the shooter (FIG. 6).

(26) For either embodiment, the electronic components are powered by a battery (omitted for clarity in FIGS. 4 and 5) or other suitable power source. A switch (not shown) such as a push button or toggle, may be provided on the body of the rear sight for selectively activating the light sources.

(27) FIG. 7 shows an optional embodiment wherein the visibility of the rear aiming marks during daylight is enhanced by the addition of high-visibility aiming marks (25) and (26) around the illuminated rear aiming marks (5) and (6). In the particular embodiment, the high-visibility aiming marks are circles (25) and (26) formed around the rear aiming marks (5), (6) though other markings, such as crosshairs, would be apparent to the person skilled in the art. Similarly, the visibility of the front aiming mark (7) during daylight can be enhanced by the addition of a high-visibility aiming mark around it (not illustrated). High-visibility aiming marks may be formed in any way known in the art, including by applying high-visibility paint (or highly reflective paint) to portions of the rear sight and/or the front sight.

(28) For simplicity and brevity, non-essential components of the invention such as the battery and the electronic circuits required to operate the LED light source(s) are not described. Persons skilled in the art would be familiar with designing suitable electronic circuits, switches and battery compartments for the invention and would be able to arrange these components within the rear sight (1) as required.

(29) In one embodiment, the illumination unit may be activated by a tilt sensor, such as a mini-ball type sensor. In one embodiment, the unit may turn on with a tilt, which may also require activation of a button. Settings, such as brightness of the illumination, may also be changed using a change setting button in conjunction with whether the unit is tilted or not. Other settings that can be changed include an auto-off timer.

(30) How to Use the Invention

(31) To use the illuminated open sight disclosed in this invention, the user must install the rear sight (1) and the front sight (2) on his weapon's receiver such that the rear aiming marks (5) and (6) are positioned at the same height as the front aiming mark (7) when measured from the axis of the barrel. Additionally, the front aiming mark (7) must be positioned such that when viewed through the opening (3), the axis of view thus formed is parallel with the axis of the weapon's barrel.

(32) To aim his weapon using the illuminated open sight described in this invention, the shooter must laterally align the two rear aiming marks (5) and (6) with the front aiming mark (7), i.e. place the front aiming mark (7) level and between the two rear aiming marks (5) and (6) and, additionally, hold the weapon such that the front aiming mark (7) is longitudinally aligned with the target.

(33) A further embodiment of the invention is schematically depicted in FIG. 8. The rear sight 100 includes a single artificial light source (124) that is used to illuminate both the forward aiming mark and the two rear aiming marks via a light pipe (125). The light source (124) is preferably a battery powered light emitting diode (LED). It can also be made from any other light emitting sources, such as phosphorescence or photoluminescence materials. Alternatively, light source (124) may be a collector or port for receiving and focusing (concentrating) ambient light. The light pipe (125) may be made from acrylic, glass or other suitable material. The light pipe (125) is positioned inside the rear sight (100) such that its receiving end (126) is close to the light source (124). The light pipe (125) has branches leading to a forward exit end (127) to enable light to be projected forward into the air gap between the rear sight and the front sight, and two rearward exit ends (128), (129). The rearward exit ends form the rearward aiming marks and are visible to the shooter in a similar manner as shown in FIG. 6. Each exit end of the light pipe (125) may optionally include a filter (130, 131, 132) that can be used to control the color and/or intensity of the light output from the respective exit. In one embodiment, the light source 125 may be a white LED and the rear filters 131, 132 may provide a red filter that also reduces the intensity of the emitted light compared to a brighter forward emitted white light.

(34) Although the description above contains many specifications, these should not be construed as limiting the scope of the invention but as merely providing illustrations of some of the embodiments of this invention. Thus, the scope of the invention should be determined by the appended claims and their legal equivalents rather than by the examples given.