# Patent

## Title
Method and systems for aligning a point of aim with a point of impact for a projectile device

## Abstract

A method of aligning a point of aim with a point of impact for a projectile device is disclosed. Using at least one superposition device coupled to the projectile device, multiple optical reference points are superposed within a first target area. Positions for at least two of the optical reference points are noted. A projectile is shot from the projectile device at a second target area, while the positions of the at least two optical reference points are maintained, to create the point of impact. The point of aim for the projectile device is adjusted to correspond with the point of impact while the positions of the at least two optical reference points are maintained. A system for aligning a point of aim with a point of impact for a projectile device is also disclosed.

## Background
PRIORITY CLAIM
This application is a continuation of application Ser. No. 14/288,872, filed on May 28, 2014 which is a division of application Ser. No. 13/667,070, filed on Nov. 2, 2012, now U.S. Pat. No. 8,769,858, the entire contents of which are incorporated by reference in their entirety.


BACKGROUND OF THE INVENTION
1. The Field of the Invention
The claimed invention generally relates to firearms and other projectile devices. More particularly, the claimed invention relates to methods and systems for aligning a point of aim with a point of impact for a projectile device. The claimed invention also relates to methods and systems for indicating a relationship between a point of aim and a point of impact for a projectile device.
2. Background Art
Firearms, and other projectile devices such as air guns, pellet guns, and bows, are often provided with an aiming device such as, but not limited to a scope, an iron sight, a dot sight, a holographic sight, a shotgun sight, a bead sight, or a ramp sight.
In order for the aiming device to have an increased effectiveness, it is important to check and adjust the projectile device and its aiming device such that a point of impact of a projectile launched by the projectile device is aligned with the point of aim of the aiming device. Such alignment, or zeroing of the point of aim and point of impact can make the projectile device far more accurate than a non-aligned or non-zeroed device.
In order to understand existing zeroing processes, it is helpful to look at the trajectory of a projectile fired by a projectile device in comparison to a point of aim for the same projectile device. For convenience, a rifle will be used throughout this specification as an example of a projectile device, but it should be understood that projectile devices include, but are not limited to rifles, pistols, shotguns, firearms, BB guns, pellet guns, air guns, cannons, and bows. FIG. 1 schematically illustrates an example of a person aiming a rifle 30 over a distance of one hundred yards using a scope 32. For convenience, a scope will be used throughout this specification as an example of an aiming device coupled to the projectile device. However, it should be understood that aiming devices include, but are not limited to scopes, iron sights, dot sights, holographic sights, shotgun sights, bead sights, and ramp sights.
The person of FIG. 1 looks through the scope 32 and has a point of aim which may lie along an imaginary sight line 34 which results from an orientation of the scope 32 (for example an up/down or left/right orientation of the scope), an orientation of an optical axis within the scope, and position of the person's eye relative the scope and its optical axis. The sight line 34, along which the point of aim may lie, is a straight line.
A projectile, in this example a bullet, when fired from the rifle 32 will follow a curved path 36 due to the effect of gravity. In the example of FIG. 1, looking at the curves only in the two dimensions of the page, the curved path 36, or trajectory, crosses the line of sight 34 at two points. For this example, those two points are twenty-five yards and two hundred yards. A change in alignment between the optical axis of the scope and the rifle can cause the projectile trajectory to cross the line of sight at different locations or not at all.
Looking only in the two dimensions of FIG. 1, if the desired point of aim was at twenty-five yards or two hundred yards, then the rifle 30 would be zeroed at those distances because the point of aim is aligned with the point of impact at the desired distance. In reality, a projectile device needs to be zeroed in three dimensions. For example, FIG. 2 schematically illustrates a view of a target ring 38 through a scope 32. The point of aim 40 is where the scope's crosshairs 42, 44 meet. An operator has the point of aim directly in the middle of the target ring 38, but FIG. 2 also illustrates an example bullet hole marking a point of impact 46 from when the rifle was fired with the point of aim 40 in the target ring 38. Therefore, zeroing must be performed in three dimensions: for example, up/down, left/right, and out to a particular distance.
Numerous situations may create a need to zero a projectile device, including, but not limited to:
if the projectile device is new;
if the projectile device has a newly installed aiming device;
if the projectile device has been dropped, bumped, or otherwise been roughly handled (the projectile device undergoes traumatic impact);
if the projectile device has been dismantled and put back together;
if the projectile device has been fired numerous times;
if the distance of the desired point of aim changes;
if different projectiles (as one example, different ammunition) will be used with the projectile device; and
if a different operator will be using the projectile device.
Various solutions have been proposed to help with the zeroing of projectile devices. For example, a recursive solution utilizing multiple rounds (projectiles) is often used when trying to zero projectile devices. As an example of such a recursive solution, a person with a rifle having a scope may aim at a target and then fire. Assuming the rifle starts off aligned to at least shoot the bullet in the vicinity of the point of aim (for example, on a same target area), then the person may measure a horizontal offset 48 and a vertical offset 50 (as illustrated in FIG. 2) between the point of impact 46 and the point of aim 40. Some scopes are equipped with horizontal and vertical adjustment knobs/screws which can then be twisted, dialed, or clicked a particular number of times, per a manufacturer's instructions to compensate for the horizontal offset 48 and vertical offset 50. Unfortunately, it is often difficult to determine how far to turn the adjustment dials because the manufacturers guidelines may be based on a distance different from the desired zeroing distance. Furthermore, the scope adjustment knobs often create audible clicks as they are turned. These clicks need to be counted, but they may be hard to hear in certain environments, especially if hearing protection is being worn (as is often the case around certain firearms). To make matters worse, the springs inside many of the scope adjustment knobs often relax over time, resulting in inaccurate offset compensation even if a desired number of clicks or adjustment turns is used. Given such variability in scope adjustment, a follow-up round, when fired at the target, will most likely not coincide with the point of aim. The process then needs to be repeated, often five to ten times or more. The process is also further complicated and delayed if the scope adjustments are more rudimentary and/or if the projectile device operator is not highly skilled.
Such zeroing techniques can be very wasteful of ammunition or other projectiles. Considering that single rounds of ammunition often cost $1.00 or more each, an enthusiast may be spending $10-20 or more just to zero his weapon each time. According to the National Rifle Association, in 2010 people owned three hundred million firearms in the U.S. alone. Military and law enforcement organizations are also large consumers and users of firearms and other projectile devices which need to be zeroed frequently. The potential reduction in waste and cost savings are staggering if a more efficient method of zeroing projectile devices can be discovered.
Some have proposed methods for zeroing a projectile device which utilize a laser arbor that can be inserted into the barrel of a rifle or other firearm. The laser arbor may be magnetized to temporarily adhere to the inside of the rifle barrel or a properly sized caliber arbor can lodge against the bore while the laser light is shined towards a target as a surrogate for a point of impact since it originated coaxially with the rifle barrel. The scope, or other aiming device, however, cannot be aligned with the laser light since the light travels in a straight line as opposed to the curved trajectory of a bullet. Therefore, if the laser light from such arbor devices is projected onto a target, the scope's point of aim must be aligned somewhere else offset from the laser. This increases the opportunity for human error. Such errors can be complicated by wobble from the magnetically attached laser arbor. Furthermore, some firearms cannot be used with a magnetic laser arbor because the barrels are not iron-based and therefore non-magnetic. On top of this, the more serious firearm enthusiasts will not use such a device which intrudes into the barrel crown because it may cause distortion to the barrel's grooving. Still further, such methods require a minimum of two rounds (one initial shot, and at least one follow-up shot to compensate for the flat laser trajectory).
In an attempt to overcome objections to barrel crown intrusion, some manufacturers have created laser cartridges which can be cambered to shine laser light down the inside length of a rifle barrel and out onto a target. While crown insertion is avoided, the linear trajectory of the laser results in similar downfalls to the previously described solution. Furthermore, the spot radius of existing cartridge lasers is quite large, making it further difficult to zero the point of aim onto a point of impact.
Other zeroing solutions provide magnetic grids which can be stuck onto the end of a rifle barrel, rather than inserted into the bore. The scope is then aligned with the grid visible at the end of the barrel. Such methods are useful for “getting a shot on paper” (hitting a paper target), but then usually one of the above methods is needed, typically the recursive method, to truly align the point of aim with the point of impact. Furthermore, as yet another magnetic method, such a technique does not work with firearms made from non-iron-based materials.
Therefore, there is a need for a more efficient, reliable, and money and ammunition saving method and system for aligning a point of aim with a point of impact for a projectile device. Additionally, there is a need for a method and system of indicating a relationship between a point of aim and a point of impact for a projectile device so that a previously zeroed projectile device may be more quickly checked for zero and realigned if necessary in an efficient manner.
SUMMARY OF THE INVENTION
A method of aligning a point of aim with a point of impact for a projectile device is disclosed. Using at least one superposition device coupled to the projectile device, multiple optical reference points are superposed within a first target area. Positions for at least two of the optical reference points are noted. A projectile is shot from the projectile device at a second target area, while the positions of the at least two optical reference points are maintained, to create the point of impact. The point of aim for the projectile device is adjusted to correspond with the point of impact while the positions of the at least two optical reference points are maintained.
A system for aligning a point of aim with a point of impact for a projectile device is also disclosed. The system includes at least one superposition device configured to be coupled to the projectile device, and to superpose multiple optical reference points within a first target area.



BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 schematically illustrates an example of a person aiming a rifle over a distance of one hundred yards using a scope.
FIG. 2 schematically illustrates one example of a view of a target ring through a scope, where a point of impact is not properly aligned with a point of aim.
FIG. 3 illustrates one embodiment of a method of aligning a point of aim with a point of impact for a projectile device.
FIG. 4 schematically illustrates one embodiment of a system for aligning a point of aim with a point of impact for a projectile device.
FIG. 5 schematically illustrates one embodiment of a system, coupled to a rifle, for aligning a point of aim with a point of impact.
FIGS. 6A and 6B schematically illustrate embodiments of projection devices for projecting multiple optical reference points.
FIGS. 7A-7E illustrate embodiments of multiple optical reference points.
FIG. 8A-1 schematically illustrates an embodiment of using at least one projection device coupled to a projectile device to project multiple optical reference points within a first target area that coincides with a second target area having a target ring.
FIG. 8A-2 schematically illustrates an embodiment of using at least one projection device coupled to a projectile device to project multiple optical reference points within a first target area that is closer than a second target area having a target ring.
FIG. 8A-3 schematically illustrates an embodiment of using at least one projection device coupled to a projectile device to project multiple optical reference points within a first target area that is farther than a second target area having a target ring.
FIG. 8B schematically illustrates one embodiment of noting positions for at least two of the optical reference points.
FIG. 8C schematically illustrates an embodiment of shooting a projectile from the projectile device at a second target area, while the positions of the at least two optical reference points are maintained, to create a point of impact.
FIG. 8D schematically illustrates an embodiment of adjusting the point of aim for the projectile device to correspond with the point of impact while the positions of the at least two optical reference points are maintained.
FIG. 9 schematically illustrates one example of a view of a target ring through a scope, where a point of impact is properly aligned with a point of aim.
FIG. 10A schematically illustrates one embodiment of a target having a first target area with pre-printed reference points corresponding to desired positions for optical reference points. This target embodiment also has a second target area with a pre-printed target ring.
FIG. 10B schematically illustrates another embodiment of a target having a first target area with pre-printed reference points corresponding to desired positions for optical reference points. This target embodiment also has a second target area with a preprinted target ring.
FIG. 10C schematically illustrates a further embodiment of a target having a first target area with adjustable reference points corresponding to desired positions for optical reference points. This target embodiment also has a second target area on which a target may be drawn or hung.
FIG. 11A schematically illustrates one embodiment of a view through a projectile device scope, the scope having multiple optical reference points thereon which may be projected onto a target area by being superimposed on the scope's image.
FIG. 11B schematically illustrates one embodiment of a view through the projectile device scope of FIG. 11A, wherein the multiple optical reference points of the embodiment of FIG. 11A are projected onto a first target area through superimposition of the scope's optical reference points onto multiple alignment points within the first target area.
FIG. 11C schematically illustrates an example of a view through the projectile device scope of FIG. 11B, wherein a projectile has been shot from the projectile device at a second target area while the positions of the at least two optical reference points are maintained to create a point of impact.
FIG. 11D schematically illustrates an example of a view through the projectile device scope of FIG. 11C, wherein the point of aim for the projectile device has been adjusted to correspond with the point of impact while the position of the at least two optical reference points are maintained.
FIG. 12 schematically illustrates that the processes can be also be applied with shotgun projectile devices.
FIG. 13A schematically illustrates an embodiment of a system for aligning a point of aim with a point of impact for a projectile device, wherein the embodiment includes or is fashioned to support a level.
FIG. 13B schematically illustrates an embodiment of a system for aligning a point of aim with a point of impact for a projectile device, wherein the embodiment includes or is fashioned to receive a remote activation switch for the at least one projection device.
FIGS. 14A-1, 14B-1, and 14C-1 schematically illustrate embodiments of different mounting methods for coupling at least one projection device to a projectile device.
FIGS. 14A-2, 14B-2, and 14C-2 schematically illustrate partially exploded views of the embodiments of FIGS. 14A-1, 14B-1, and 14C-1, respectively.
FIG. 15 illustrates one embodiment of a method of indicating a relationship between a point of aim and a point of impact for a projectile device.
FIG. 16A schematically illustrates one embodiment of a system, coupled to a rifle, for indicating a relationship between a point of aim and a point of impact.
FIG. 16B schematically illustrates, at a first time, adjusting a first spot from an aimable illumination source, coupled to the projectile device at a fixed location, such that the first spot coincides with the point of aim of the projectile device on a first surface located at a first distance.
FIG. 16C schematically illustrates, at a second time, shining a second spot from the locked aimable illumination source, coupled to the projectile device at the fixed location, on a second surface located substantially at the first distance.
FIG. 16D schematically illustrates adjusting the point of aim of the projectile device so that the point of aim coincides with the second spot from the locked aimable illumination source.
FIGS. 17A-1 and 17B-1 schematically illustrate embodiments of an aimable illumination source that may be coupled to a projection device.
FIGS. 17A-2 and 17B-2 schematically illustrate a partially exploded view of the aimable illumination source of FIGS. 17A-1 and 17B-1, respectively.
FIG. 18 schematically illustrates one embodiment of a system for indicating a relationship between a point of aim and a point of impact for a projectile device, wherein the system has an embodiment of an index for recording a distance.



It will be appreciated that for purposes of clarity and where deemed appropriate, reference numerals have been repeated in the figures to indicate corresponding features, and that the various elements in the drawings have not necessarily been drawn to scale in order to better show the features.
DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT
FIG. 3 illustrates one embodiment of a method of aligning a point of aim with a point of impact for a projectile device. A projectile device may include, but is not limited to a rifle, a pistol, a gun, a shotgun, a firearm, a BB gun, an air gun, a pellet gun, a bow, a cannon, or any weapon from which a projectile is launched explosively, pneumatically, or by stored tension. As mentioned previously, for convenience, the projectile device will often be discussed in terms of a rifle within this specification. However, it should be understood that the scope of a projectile device is much larger than just a rifle and is intended to include, but not be limited to, all listed examples of projectile devices, their equivalents, and alternates.
In step 52, using at least one superposition device coupled to the projectile device, multiple optical reference points are superposed within a first target area. In some embodiments, the at least one superposition device may include at least one illumination source such as, but not limited to a laser. In the case where the at least one superposition device coupled to the projectile device is at least one illuminated light source, the at least one illuminated light source can project multiple optical reference points onto the first target area as visible light spots and/or shapes shined onto the first target area. In other embodiments, the at least one superposition device may include scope features (multiple optical reference points) which are visible over (superposed) on the first target area when looking through the scope. Such embodiments will be discussed further in more detail later in this specification.
In step 54, positions for at least two of the optical reference points are noted. In the case of illuminated optical reference points, the optical reference points may be marked on the first target area with items such as, but not limited to a marker, a writing device, a push pin, or a sticker. Alternatively, the optical reference points may be noted by aligning the illuminated optical reference points over pre-printed indicators in the first target area. Similarly, in the case of embodiments where the at least two optical reference points come from scope features which may be superposed on a target area by looking through a scope, the optical reference points may be noted by aligning the scope's optical reference points over the pre-printed indicators in the first target area.
In step 56, a projectile is shot from the projectile device at a second target area, while the positions of the at least two optical reference points are maintained, to create the point of impact. In some embodiments, the first target area may include the second target area. On other embodiments, the first target area and the second target area may be located in different locations and not even physically connected to one another. This will be discussed in more detail later in this specification. Projectiles may include, but are not limited to a bullet, multiple shot, a BB, a pellet, and an arrow.
In step 58, the point of aim for the projectile device is adjusted to correspond with the point of impact while the positions of the at least two optical reference points are maintained on their noted locations. The point of aim for a projectile device is determined, in part by the aiming device used with the projectile device. Some examples of aiming devices include, but are not limited to a scope, an iron sight, a dot sight, a holographic sight, a shotgun sight, a bead sight, and a ramp sight. Once the point of aim for the projectile device is adjusted to correspond with the point of impact, while the positions of the at least two optical reference points are maintained on their noted locations, the projectile device will be properly zeroed (the point of aim will be aligned with the point of impact) with only a single shot.
Without being tied to a particular theory, this method relies on triangulation, using the point of impact and the multiple optical reference points to obtain a minimum of three points of reference to ensure that when the point of aim is moved that other variables such as distance from target and rifle cant (tipping) are minimized.
FIG. 4 schematically illustrates one embodiment of a system 60 for aligning a point of aim with a point of impact for a projectile device. The system 60 has at least one superposition device configured to be coupled to the projectile device, and to superpose multiple optical reference points within a target area. For the embodiment of FIG. 4, the system 60 has two superposition devices 62 (lasers in this example) which may be coupled to a rifle barrel via clamp 64. There are many types of connections known to those skilled in the art which would allow the coupling of the lasers 62 to a rifle barrel. As just some non-limiting examples, rounded, oval, or angled screw-on clamps may be used. Other embodiments may have clamps which are cantilevered to enable quick attachment and removal of the system 60. Still other embodiments may make use of existing or custom detents, tapped holes, threaded posts, adhesives, interchangeable mounting brackets, and/or the like, as well as other mounting positions on the projectile device.
FIG. 5 schematically illustrates one embodiment of a system 66, coupled to a rifle 68, for aligning a point of aim with a point of impact. As can be seen in this view, the lasers 62 may be activated to create multiple optical reference points 70 on a target area. In some embodiments, it may be desirable to have the lasers diverge so that the spacing of the gap between the optical reference points 70 has a relation to the distance from the target. In some embodiments, this amount of laser divergence may be adjustable.
FIGS. 6A and 6B schematically illustrate embodiments of superposition devices for superposing multiple optical reference points. The superposition device embodiment 72 of FIG. 6A has two illumination sources, in this example lasers 74A and 74B. Other embodiments may be like superposition device embodiment 76 of FIG. 6B which has one illumination source 78 sending light through a beam splitter 80 to create a first light beam 82 which will correspond to a first optical reference point. The beam splitter 80 also creates a second light beam 84 which exits the projection device 76 after being redirected by mirror 86. The superposition device embodiments of FIGS. 6A and 6B are merely illustrative that the superposition devices may have many different configurations. Those skilled in the optical arts may select from any of a number of superposition device designs, provided the multiple optical reference points are visibly superposed at a desired target distance or distances.
FIGS. 7A-7E illustrate a non-exhaustive set of embodiments of multiple optical reference points created by one or more superposition devices. The embodiment of FIG. 7A is used often throughout this specification and includes two dots 88A and 88B as its multiple optical reference points. The embodiment of FIG. 7B has multiple ends 90A and 90B which could be used as multiple optical reference points. The embodiment of FIG. 7C has ends 92A and 92B, inner and outer corners 94A and 94B, sides 96A, 96B, 96C, and 96D which may be used in parts or in whole a multiple optical reference points. FIGS. 7D and 7E illustrate two other embodiments of shapes which could be created by one or more superposition devices, such shapes having multiple sides and corners with which to create optical reference points.
As mentioned briefly before, the at least one superposition device may project multiple optical reference points onto a first target area. This first target area may be in a variety of locations relative to a second target area where the point of aim will occur. For example, FIG. 8A-1 schematically illustrates an embodiment of using at least one superposition device 66 coupled to a rifle 68 to superpose (project in this embodiment) multiple optical reference points 70 within a first target area 98 that coincides with a second target area 100 having a target ring 102. In this example, the first target area 98 and the second target area 100 are on the same paper target.
By comparison, FIG. 8A-2 schematically illustrates an embodiment of using at least one superposition 66 device coupled to a projectile device 68 to superpose multiple optical reference points 70 within a first target 104 area that is closer than a second target area 106 having a target ring 102. This configuration may be useful for enabling embodiments which use lower power lasers to superpose optical reference points, since the laser or lasers would not need to be powerful enough to be visible at the second target area distance.
Furthermore, FIG. 8A-3 schematically illustrates an embodiment of using at least one superposition device 66 coupled to a projectile device 68 to superpose multiple optical reference points 70 within a first target area 108 that is farther than a second target area 110 having a target ring 102. The three scenarios of FIGS. 8A-1, 8A-2, and 8A-3 are all compatible with the methods disclosed herein. For the sake of simplicity, therefore, the remaining discussion will use the situation of FIG. 8A-1 in the following discussions.
FIG. 8B schematically illustrates one embodiment of noting positions for at least two of the optical reference points. As some non-limiting examples, the positions for the two optical reference points 70 may be noted with a writing device 112 or with a device like a push pin 114.
FIG. 8C schematically illustrates an embodiment of shooting a projectile from the projectile device 68 at a second target area 100, while the positions of the at least two optical reference points 70 are maintained, to create a point of impact 116. A point of aim 118 also exists as determined by sighting down the scope 120 towards the target. While it is not necessary to establish the point of aim 118 prior to noting the multiple optical reference points 70, if this is done, then the point of aim can start off directed towards a desired point of aim.
FIG. 8D schematically illustrates an embodiment of adjusting the point of aim 118 for the projectile device 68 to correspond with the point of impact 116 while the positions of the at least two optical reference points 70 are maintained. The method used to adjust the point of aim 118 for the projectile device 68 will depend on the aiming device being used. The beauty of this method, however, is that rulers are not needed to measure offsets and clicks do not need to be counted. The adjustments available simply need to be turned or otherwise adjusted until the point of aim 118 moves over the point of impact. At this point, the projectile device is zeroed, after having only fired a single projectile round. FIG. 9 schematically illustrates one example of a view of a target ring 102 through a scope 120, where a point of impact 116 is properly aligned with a point of aim 118 following use of the described method.
As an alternative to noting the locations of the multiple optical reference points with a marker or pins, FIG. 10A schematically illustrates one embodiment of a target 122 having a first target area 124 with pre-printed reference points 126 corresponding to desired positions for optical reference points. Targets 122 may be made with the pre-printed references 126 spaced apart for particular zeroing distances, such as, but not limited to one or more of 25 yds., 50 yds., and 100 yds. By using such a preprinted target 122, the user can complete the zeroing process without need for the user or an assistant to walk out to the target during the zeroing process. The user would need to be at the proper distance from the target, but that distance can only be achieved when the optical reference points align with the pre-printed target references 126.
Alignment of the optical reference points with the pre-printed references 126 would be another way of noting positions for the at least two optical reference points. This target embodiment also has a second target area 128 with a pre-printed target ring 102.
Although a simple target ring 102 is illustrated in this embodiment, other embodiments may include a variety of targets as desired. Alternatively, no target may be included in the second target area 128. This would allow the user to draw or hang up his own additional target. FIG. 10B schematically illustrates another embodiment of a target 122 having a first target area 124 with pre-printed reference points 126 corresponding to desired positions for optical reference points. The embodiment of FIG. 10B also includes a grid 129 in the first target area 124. The grid 129 has horizontal lines which can be used as an assistance for leveling the target 122. The horizontal and vertical lines of the grid 129 also may provide alignment guides for a user when aligning the optical reference points with the preprinted target references. FIG. 10C schematically illustrates a further embodiment of a target 130 having a first target area 132 with adjustable reference points 134 corresponding to desired positions for optical reference points. The adjustable reference points 134 enable a single target with pre-printed reference points to be used at multiple distances by selecting the appropriate reference point spacing on the target 132. This target embodiment also has a second target area on which a target may be drawn or hung.
As mentioned previously, superposing multiple optical reference points within a target area does not have to be done with an illumination device. Alternatively, this may be accomplished by superposing multiple optical references visible in the scope optical path within the target area. Then, the step of noting positions for at least two of the optical reference points may be accomplished by aligning the multiple optical references over predetermined marks in the target area. For example, consider FIG. 11A which schematically illustrates one embodiment of a view through a projectile device scope, the scope having multiple optical reference points 136 thereon which may be superposed onto a target area. In such embodiments, optical reference points visible in the scope may be etched on a portion of glass or other transparent or transmissive material in the optical path. Alternatively or additionally, the optical reference points may be constantly or selectively illuminated in one or more colors. In some embodiments, a spacing between the multiple optical reference points may be adjusted.
FIG. 11B schematically illustrates one embodiment of a view through the projectile device scope of FIG. 11A, wherein the multiple optical reference points of the embodiment of FIG. 11A are superposed onto a first target area through superposition of the scope's optical reference points 136 onto multiple alignment points 138 within the first target area.
FIG. 11C schematically illustrates an example of a view through the projectile device scope of FIG. 11B, wherein a projectile has been shot from the projectile device at a second target area. while the positions of the at least two optical reference points 136 are maintained on the alignment points 138 to create a point of impact 140.
FIG. 11D schematically illustrates an example of a view through the projectile device scope of FIG. 11C, wherein the point of aim 142 for the projectile device has been adjusted to correspond with the point of impact 140 while the position of the at least two optical reference points 136 are maintained.
The described methods herein may be used with buckshot projectiles by treating a buckshot pattern center of mass 144 as a single point of impact which can then be aligned with a point of aim 140 as schematically illustrated in FIG. 12.
The methods and systems for aligning a point of aim with a point of impact disclosed herein are compatible with a variety of accessories. For example, FIG. 13A schematically illustrates an embodiment of a system 146 for aligning a point of aim with a point of impact for a projectile device, wherein the embodiment includes or is fashioned to support a level 148. The level 148 may be useful for helping a shooter to avoid canting his projectile device. This may be especially helpful in embodiments where the user is marking the optical reference points with a marker or a pen. Some embodiments can avoid the need for a level on the system coupled to the projectile device if pre-printed alignment points are hung level with each other on the target.
As another non-exhaustive example of an accessory which is compatible with the systems and methods disclosed herein, FIG. 13B schematically illustrates an embodiment of a system 150 for aligning a point of aim with a point of impact for a projectile device, wherein the embodiment includes or is fashioned to receive a remote activation switch 152 for the at least one superposition device. Such switches can be handy to reduce rifle movement when activating embodiments having a laser light or other switchable superposition device.
FIGS. 14A-1, 14B-1, and 14C-1 schematically illustrate non-exhaustive embodiments of different mounting methods for coupling at least one projection device to a projectile device. For simplicity, screws are not illustrated. FIG. 14A-1 illustrates an angular clamping device 154 which can be tightened onto a rifle barrel. The projection device 156 is permanently coupled to the clamp 154. The device of FIG. 14B-1 is similar to the one from FIG. 14A-1, however, the clamp 158 is fitted with a mounting rail 160 so that the projection devices 162 can be removed from the clamp 158 without removing the clamp 158 from the barrel. Numerous mounting rails, similar to the one illustrated are known to those skilled in the art. In clamp embodiments, a padded lining may be included for placement between the clamp and the gun barrel to reduce the amount of recoil transferred to the projection device. In other embodiments, such as the embodiment of FIG. 14C-1, a guiderail 164 may be provided for direct attachment to detents threaded posts or tapped holes in the barrel, enabling the superposition device 162 to be quickly removed or attached to the guide rail 164. Numerous other attachment methods are known to those skilled in the art and are intended to be covered in the scope of this description and the attached claims. FIGS. 14A-2, 14B-2, and 14C-2 schematically illustrate partially exploded views of the embodiments of FIGS. 14A-1, 14B-1, and 14C-1, respectively.
The methods disclosed herein are highly effective for efficiently and accurately zeroing a projectile device. Once a device is known to be zeroed, it is also useful to have a method and system for ensuring the projectile device is kept in a zeroed condition and if not, providing a way to quickly rezero the projectile device. Accordingly, FIG. 15 illustrates one embodiment of a method of indicating a relationship between a point of aim and a point of impact for a projectile device. The method of FIG. 15 is described with additional reference to FIGS. 16A-16D which schematically illustrate the system and its various steps. FIG. 16A schematically illustrates a system for indicating a relationship between a point of aim and a point of impact. The system comprises an aimable illumination source 166 configured to be coupled to the rifle (projectile device) 68 at a repeatable location. The rifle 68 can be aimed at a target or surface 168 a first distance 170 from the projectile device 68. This establishes a point of aim 172. The aimable illumination source 166 pivots in a plane which intersects the point of aim 172 and creates a first spot 174. In step 166, from FIG. 15, and with regard to FIG. 16B, at a first time, the first spot 174 from the aimable illumination source 166, coupled to the projectile device 68 at a repeatable location, is adjusted such that the first spot 174 coincides with the point of aim 172 of the projectile device on a first surface 168 located at a first distance 170. In step 176, from FIG. 15 the aimable illumination source 166 is locked to maintain the coincidence with the point of aim 172 at the first time. In optional step 178, the magnification and range settings at the first time may be determined for the aiming device coupled to the projectile device and used for the point of aim. In optional step 180, the determined magnification and range settings may be recorded. In optional step 182, the aimable illumination source may be removed from the projectile device so that it may be protected. A variety of storage options exist for the aimable illumination source, including a hollowed out portion of a rifle stock. In optional steps 184, 186, the first distance 170 may be determined and recorded. If the aimable illumination source was removed from the projectile device in optional step 182, then at a later time, prior to checking the zero status of the projectile device, in optional step 188 the locked aimable illumination source may be recoupled to the projectile device at the repeatable location. In step 190 from FIG. 15, and with regard to FIG. 16C, at a second time, a second spot 192 from the locked aimable illumination source 166, coupled to the projectile device 68 at the fixed location, is shined on a second surface 194 located substantially at the first distance 170. In optional step 196, the magnification and range settings of aiming device are set to the determined magnification and range settings. In step 198 from FIG. 15, and with regard to FIGS. 16C and 16D, the point of aim 200 of the projectile device 68 is adjusted, if necessary, so that the point of aim 200 coincides with the second spot 192 from the locked aimable illumination source 166.
FIG. 17A-1 schematically illustrates an embodiment an aimable illumination source 202 that may be coupled to a projectile device. Various clamps guides, and mounting options, similar to those discussed above, are known to those skilled in the art and may be used to couple to the projectile device. FIG. 17A-2 schematically illustrates a partially exploded view of the aimable illumination source of FIG. 17A-1. Since the aimable illumination source would need to be locked in place, this non-limiting embodiment utilizes a pair of star nuts 204 on a pivot joint that can be loosened to adjust a pivot angle and tightened to preserve the angle. FIG. 17B-1 illustrates another embodiment of an aimable illumination source 202 that may be coupled to a projectile device, in this case, with a guiderail 164 which may be provided for direct attachment to detents, threaded posts, or tapped holes in the barrel, enabling the aimable illumination source 202 to be quickly removed or attached to the guide rail 164. FIG. 17B-2 schematically illustrates a partially exploded view of the aimable illumination source of FIG. 17B-1. In some embodiments, a stop 203 may be provided to facilitate coupling of the aimable illumination source 202 to the projectile device at a repeatable location.
FIG. 18 schematically illustrates one embodiment of a system for indicating a relationship between a point of aim and a point of impact for a projectile device, wherein the system has an embodiment of an index 206 for recording a distance. In this embodiment, the index is integrated with the illumination device and its mounting hardware. The illumination device, or a shell on its outer edge can be rotated to align a marked distance with an arrow. This distance can be the first distance discussed above with respect to FIG. 15. Similar recording devices (tabs, rings, etc.) may be built into the system to make it easier to record the distance, magnification, and range settings.
Having thus described several embodiments of the claimed invention, it will be rather apparent to those skilled in the art that the foregoing detailed disclosure is intended to be presented by way of example only, and is not limiting. Many advantages for the systems and methods for aligning a point of aim with a point of impact for a projectile device have been discussed, including the ability to quickly and accurately zero a projectile device with only one shot. The methods and systems herein may be used to establish, maintain, or resume the relationship between a point of aim and a point of impact. These methods and systems eliminate the need for calculations when zeroing a projectile device. The methods and systems also greatly reduce the number of projectiles needed to zero a projectile device. In the case of firearms, being able to use a single round (single projectile) to zero the weapon, the weapon will incur less barrel wear than a weapon which needs to be zeroed with multiple rounds. Fewer rounds also means the barrel undergoes less heat distortion. This may result in a more accurate zeroing process when compared to zeroing methods using more rounds since weapons zeroed using more rounds will eventually cool after the multiple rounds are fired, returning the barrel to a slightly (but noticeably) different position and thereby affecting its zero position. The methods and systems for aligning a point of aim with a point of impact for a projectile device also have the benefit of indicating improper shooting technique, improper scope mounting relative to a rifle bore, or both if zero is not readily achieved.
Various alterations, improvements, and modifications will occur and are intended to those skilled in the art, though not expressly stated herein. These alterations, improvements, and modifications are intended to be suggested hereby, and are within the spirit and the scope of the claimed invention. Additionally, the recited order of the processing elements or sequences, or the use of numbers, letters, or other designations therefore, is not intended to limit the claimed processes to any order except as may be specified in the claims. Accordingly, the claimed invention is limited only by the following claims and equivalents thereto.

## Claims

1. A method of aligning a point of aim with a point of impact for a projectile device, comprising:
using at least one superposition device coupled to the projectile device, superposing at least two optical reference points within a first target area disposed on a plane;
noting positions for the at least two optical reference points, wherein noting positions for the at least two optical reference points comprises either: marking the positions of said at least two optical reference points on the first target area or aligning said at least two optical reference points on corresponding points in the first target area;
shooting a projectile from the projectile device at a second target area, while the positions of the at least two optical reference points are maintained, to create the point of impact; and
adjusting the point of aim for the projectile device to correspond with the point of impact while the positions of the at least two optical reference points are maintained.

2. The method of claim 1, wherein the second target area is disposed on the plane.

3. The method of claim 1, wherein the at least one superposition device comprises at least one illumination source.

4. The method of claim 3, wherein superposing the at least two optical reference points within the first target area comprises using the at least one illumination source to shine multiple laser dots within the first target area.

5. The method of claim 3, wherein superposing the at least two optical reference points within the first target area comprises using the at least one illumination source to shine one or more shapes within the first target area, wherein the one or more shapes create at least two optical reference points.

6. The method of claim 1, wherein the at least two optical reference points are coupled to the projectile device.

7. A method of aligning a point of aim with a point of impact for a projectile device, comprising:
using at least one superposition device coupled to the projectile device, superposing at least two optical reference points within a first target area disposed on a plane;
noting positions for the at least two optical reference points, wherein noting positions for the at least two optical reference points comprises superposing the at least two optical reference points over corresponding pre-printed alignment points in the first target area;
shooting a projectile from the projectile device at a second target area, while the positions of the at least two optical reference points are maintained, to create the point of impact; and
adjusting the point of aim for the projectile device to correspond with the point of impact while the positions of the at least two optical reference points are maintained.

8. The method of claim 7, wherein the corresponding pre-printed alignment points in the target area are positioned such that the projectile device is level when the at least two optical reference points are superposed on the corresponding pre-printed alignment points in the target area.

9. The method of claim 1, further comprising leveling the projectile device prior to noting the positions for the at least two optical reference points.

10. The method of claim 1, wherein adjusting the point of aim for the projectile device comprises aiming with an aiming device coupled to the projectile device, wherein the aiming device is selected from the group consisting of:
a scope;
an iron sight;
a dot sight;
a holographic sight; and
a shotgun sight.

11. The method of claim 1, wherein the at least two optical reference points are leveled with respect to the projectile device.

12. The method of claim 7, wherein:
the at least two optical reference points are leveled with respect to the projectile device; and
the corresponding pre-printed alignment points in the first target area are level.

13. The method of claim 7, wherein the second target area is disposed on the plane.

14. The method of claim 7, wherein the at least one superposition device comprises at least one illumination source.

15. The method of claim 14, wherein superposing the at least two optical reference points within the first target area comprises using the at least one illumination source to shine multiple laser dots within the first target area.

16. The method of claim 14, wherein superposing the at least two optical reference points within the first target area comprises using the at least one illumination source to shine one or more shapes within the first target area, wherein the one or more shapes create at least two optical reference points.

17. The method of claim 7, further comprising leveling the projectile device prior to noting the positions for the at least two optical reference points.

18. The method of claim 7, wherein adjusting the point of aim for the projectile device comprises aiming with an aiming device coupled to the projectile device, wherein the aiming device is selected from the group consisting of:
a scope;
an iron sight;
a dot sight;
a holographic sight; and
a shotgun sight.