RELATED APPLICATION  
       [0001]    The present application claims the benefit of U.S. Provisional Application Nos. 60/258,668, filed Dec. 28, 2000, and No. 60/220,743, filed Jul. 26, 2000, both applications being incorporated herein in their entirety by reference. 
     
    
     
       FIELD OF THE INVENTION  
         [0002]    The invention relates to an attachment for a telescopic sight for a firearm that enables focusing of the sight without removing the hand from the normal shooting position. The invention may be adapted for any other focusable optical device.  
         BACKGROUND OF THE INVENTION  
         [0003]    When using a gun with a telescopic sight it is often necessary to focus the sight for targets at different shooting distances. Commonly, the telescopic sight has a focusing ring near the ocular end for accomplishing this task.  
           [0004]    To focus currently available telescopic sights, one hand must be removed from its shooting position and used to manipulate the focusing ring. This movement disturbs the marksman&#39;s concentration and may induce loss of sight of the target. In the case of a hunter stalking game it may create enough movement or noise to spook the game. Additionally, game is often barely seen among foliage or other obstructions. Losing sight of the game momentarily may result in loss of the opportunity to take a shot at it.  
           [0005]    A variety of efforts have been made to address this problem. For example, U.S. Pat. No. 5,180,875 issued to Berry, Jr. et al. relates to a scope adjustment for firearms including a thumb wheel for focusing the scope with the marksman&#39;s trigger hand.  
           [0006]    U.S. Pat. No. 5,276,554 issued to Nassivera discloses a magnification adjustment system for a variable power rifle scope. The device includes a multi-purpose lever which may be manipulated by the thumb of a marksman&#39;s trigger hand for adjusting the focus of the scope.  
           [0007]    U.S. Pat. No. 5,521,757 issued to Olson relates to an adjustment lever that may be pushed to rotate the adjustment ring.  
           [0008]    U.S. Pat. No. 5,528,847 issued to Fisher et al. discloses a variable power telescopic sight.  
           [0009]    U.S. Pat. No. 5,020,262 issued to Pena describes a camera mount for rifle scopes whereby the camera is activated when the rifle trigger is pulled.  
           [0010]    U.S. Pat. No. 4,290,219 issued to Boller et al. teaches a target sight recording apparatus.  
           [0011]    U.S. Pat. No. 5,942,211 discloses a clamping ring with an extended handle dimensioned to be secured to the adjustment ring on a rifle scope. The extended handle includes a remote ring for receiving a finger to manipulate the adjustment ring. All of the above mentioned patents disclose devices that must be manipulated by the marksman&#39;s trigger hand. This still tends to break the marksman&#39;s concentration and may create enough movement to spook game. Also, many of these devices create substantial obstruction in the area of the rifle where the marksman may need to manipulate either a bolt action or other mechanical parts of the firearm.  
           [0012]    The &#39;211 patent also discloses but does not claim a battery operated motor and wired switch assembly that is connectable to the adjustment ring of a scope. The switch may be located on the firearm and manipulated as needed to adjust the scope. This approach is limited by the encumbrance of the wired switch. The wires must be run from the switch assembly to the motor and may interfere with the operation of the moving parts of the weapon. Further, the wired switch is difficult to relocate as desired, for example, a variety of marksmen might use a single firearm each desiring a different location for the switch.  
           [0013]    It would be beneficial for a marksman to be able to focus a telescopic sight while keeping his hands in place on the weapon stock and without disturbing the marksman&#39;s aim or his potential target. Further, it would be beneficial if the controller for the focusing mechanism could be placed at any desired location on the firearm and not create obstruction involved in mechanical or wired connection to the scope.  
         SUMMARY OF THE INVENTION  
         [0014]    The present invention solves the above noted problems by providing a motorized, finger operated mechanism for focusing a telescopic sight. The power focusing device generally includes a battery powered motorized focus mechanism operably attachable to the focusing ring of a telescopic sight, a wireless receiver and a controller. The operator controls the focusing mechanism by manipulation of the controller.  
           [0015]    The focus mechanism includes a motor, a reduction drive, a power source and a device to engage the focusing ring. The focus mechanism may be secured to an existing telescopic sight or integrated into the telescopic sight design.  
           [0016]    The controller includes a switch by which the focus mechanism may be operated in either of two directions. The controller may be positioned in any location convenient to the fingers of the marksman. An additional focus mechanism may be employed to operate a different sight function, for example, to operate a zoom mechanism. The wireless receiver receives commands from the controller, preferably via infrared media. The receiver includes a motor driver that activates the motor in response to the command received and adjusts the telescopic sight parameter in response.  
           [0017]    Thus, the operator of the power focusing device may adjust the focus, zoom or other parameter of a telescopic sight without significant movement that is likely to disturb his aim or spook the game that is his intended target. 
       
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0018]    [0018]FIG. 1 is a top plan view of a power focus attachment as utilized on a telescopic rifle sight;  
         [0019]    [0019]FIG. 2 is a side plan view of the power focus attachment as utilized on a rifle mounted telescopic sight;  
         [0020]    [0020]FIG. 3 is a rear plan view of the power focus attachment as utilized on a rifle mounted telescopic sight;  
         [0021]    [0021]FIG. 4 is a fragmentary sectional view of the housing and contents;  
         [0022]    [0022]FIG. 5 is a block diagram of a controller as utilized in the present invention;  
         [0023]    [0023]FIG. 6 is an exemplary schematic circuit diagram of the controller of FIG. 5;  
         [0024]    [0024]FIG. 7 is a block diagram of a wireless receiver as utilized in the present invention; and  
         [0025]    [0025]FIG. 8 is an exemplary schematic circuit diagram of the wireless receiver of FIG. 7. 
     
    
     DETAILED DESCRIPTION OF THE INVENTION  
       [0026]    The power focusing device  10  depicted in FIGS. 1, 2 and  3  generally includes a focuser  12  and a controller  14 . The controller  14  is mounted on a telescopic sight  16  which is in turn mounted on a firearm  18 . The firearm  18  may be a rifle, a hand gun or another similar weapon such as a crossbow. The firearm  18  described and depicted herein is a rifle but this should not be construed as limiting. Additionally, this application will refer to focusing the telescopic sight, however, it is to be understood that the power focusing device may be used to control any adjustable parameter of the scope. These may include a zoom mechanism, windage adjustment or elevation adjustment. The power focusing device  10  is intended to be universally adaptable to telescopic sights and spotting scopes.  
         [0027]    The telescopic sight  16  includes an objective lens  20 , an eyepiece  22 , a barrel  24  and a focusing ring  26 . The firearm  18  includes a forestock  28 , a trigger guard  30  and a pistol grip  32 .  
         [0028]    The focuser  12  includes a housing  34 , brackets  36 , a pulley  38  and a belt  40 . The housing  34  is secured to the barrel  24  of the telescopic sight  16  via brackets  36 . Pulley  38  is operably engaged to focusing ring  26  by belt  40 . Belt  40 , focusing ring  26  and pulley  38  may include meshing teeth (not shown).  
         [0029]    Referring to FIG. 4, enclosed within housing  34  are power supply  42 , motor  44 , reduction drive  46  and power shaft  48 . Motor  44  is reversible. Power supply  42  is electrically connected to motor  44 . Motor  44  turns reduction drive  46  which in turn rotates power shaft  48  which is operably connected to pulley  38 . Housing also contains wireless receiver  50 .  
         [0030]    Power supply  42  may be a battery or other power source. The motor  44  and reduction drive  46  are preferably a Maxon A max 119070 p07 motor and a Maxon A max 122.6:1 gear head.  
         [0031]    The controller  14  includes a switch  52 . The switch  52  may be any switch with two momentarily closed positions. Advantageously, switch  52  includes two momentary contact push button switches  53 . The first closed circuit activates focuser  12  in a first direction. The second closed position activates focuser  12  in a direction opposed to the first. Preferably, switch  52  includes two momentary push button contact switches each activating the focuser in one direction. Another style of switch may also be employed so long as it allows an appropriate number of momentary contact circuits for the desired focuser functions.  
         [0032]    The controller  14  may be placed in any location on or near to the firearm  18  that is readily reachable by the marksman. For example, the controller may be conveniently located on or in the vicinity of the trigger guard  30  and controlled by the marksman&#39;s trigger finger (not shown). Preferably, the controller  14  may be located on the forestock  28  or pistol grip  32  of a rifle or pistol in any location convenient to the marksman.  
         [0033]    The controller  14  may be hardwired to the focuser  12 , or preferably employs wireless technology and a wireless receiver  50 .  
         [0034]    Wireless controller  14  transmits a signal received by wireless receiver  50  to activate the focuser  12  for each direction of rotation. A radio frequency transmitter and receiver may be employed. The frequency is preferably non-regulated with a maximum range of ten feet. Infrared technology is preferred to reduce the possibility of interference between multiple power focusing devices  10  which may be operated in the same vicinity.  
         [0035]    Referring to FIG. 5 wireless controller  14  preferably includes encoder  54 , sender  56 , power source  58 , and two switches  53 . Encoder  54  preferably employs low power, high noise immunity CMOS technology and is capable of encoding information which consists of N address bits and 12-Ndata bits.  
         [0036]    Encoder  54  encodes a command signal. Sender  56  sends a signal via RF or preferably infrared radiation. Power source  58  supplies power to encoder  54  and sender  56 . Switches  53  close their respective circuits to initiate encoder  54  encoding a signal.  
         [0037]    [0037]FIG. 8 schematically depicts a detailed circuit as utilized in one embodiment wherein encoder  54 , sender  56 , power source  58 , and two switches  53  are identified by like reference numerals. As shown in this embodiment, encoder  54  may be a an HT12A or equivalent manufactured by Holtek Semiconductor, Inc. located at No. 3 Creation Road II, Science-based Industrial Park, Hsinchu, Taiwan, R.O.C. This encoder is described in a document entitled HT12A/HT12E 2 12    Series of Encoders  published Apr. 11, 2000, which is incorporated herein in its entirety by reference.  
         [0038]    A detailed circuit of one embodiment of the invention is schematically depicted in FIGS. 6 and 8. Those skilled in the art may employ other circuits without departing from the spirit and scope of the invention.  
         [0039]    Referring to FIG. 7, wireless receiver  50  generally includes receiver  62 , decoder  64  and motor driver  66  and is operably connected to motor  44 . Receiver  62  receives a signal which is decoded by decoder  64  which in turn activates motor driver  66  to control motor  44 . A detailed example circuit of an embodiment is schematically depicted in FIG. 8 wherein components are identified by like reference numerals. Other circuits may be employed without departing from the spirit and scope of the invention.  
         [0040]    As depicted in FIG. 8, receiver  62  is preferably a bipolar integrated circuit with photo detection function such as a Panasonic PNA4612M or equivalent as described in a document entitled Photo IC PNA4611M  Series  which is incorporated herein in its entirety by reference. Decoder  64  is preferably a Holtek HT12D integrated circuit as described in a document entitled 2 12    Series of Decoders  published Jul. 12, 1999 which is incorporated herein in its entirety by reference. Motor driver  66  is preferably a Holtek HT6751A or equivalent as described in a document entitled HT6751A/B Camera Motor Driver (1.5 Channel) published Aug. 7, 2000 which is incorporated herein in its entirety by reference.  
         [0041]    As is apparent in FIGS. 1 through 4, the focuser  12  is connected to the focusing ring  26  via pulley  38  and belt  40 . Other approaches, such as friction wheels, gears, and sprocket and chains may be employed without departing from the spirit and scope of the invention.  
         [0042]    The power focusing device  10  is depicted in FIGS. 1 through 4 as an attachment to an existing telescopic sight  16 . However, it is specifically contemplated that the power focusing device  10  may be integrated into a telescopic sight as a power focusing telescopic sight unit.  
         [0043]    In operation, the focuser  12  is mounted to the telescopic sight  16  via brackets  36 . The controller  14  is mounted on the firearm  18  at a location preferred by the marksman that will use it. The belt  40  is engaged around focusing ring (adjuster)  26  and pulley  38 . The firearm  18  is then sighted as usual through eyepiece  22 . The marksman may activate switch  52  as desired to focus the telescopic sight  16  on the target (not shown) or adjust any other parameter of the sight.  
         [0044]    Upon activation of switch  52  in a first direction encoder  54  generates a signal and delivers it to sender  56 . Sender  56  converts the signal to RF or infrared radiation and transmits it. This signal is received by receiver  62 , converted to electrical impulses and sent to decoder  64 . Decoder  64  decodes the signal command and activates motor driver  66  in the desired direction to control motor  44 . Motor  44  then drives reduction gear  46  which in turn adjusts an adjustable parameter of scope  16  such as focuser  12 .  
         [0045]    The present invention may be embodied in other specific forms without departing from the spirit of the essential attributes thereof; therefore, the illustrated embodiments should be considered in all respects as illustrative and not restrictive, reference being made to the appended claims rather than to the foregoing description to indicate the scope of the invention.
A motorized, finger operated mechanism for focusing or otherwise adjusting a telescopic sight. The power focusing device generally includes a battery powered motorized focus mechanism operably attachable to the focusing ring of a telescopic sight, a wireless receiver and a wireless controller. The operator controls the focusing mechanism by manipulation of the controller. The focus mechanism includes a motor, a reduction drive, a power source and a device to engage the focusing ring. The focus mechanism may be secured to an existing telescopic sight or integrated into the telescopic sight design.