Abstract:
A lighted visual marker or beacon for use primarily by outdoorsmen is disclosed. The device utilizes LED bulbs that emit a green light that is inoffensive to nocturnal wildlife so as not to alarm them. The device may be mounted to or suspended from a tree or mounted in the ground to provide guidance to paths, campsites, tree-stands and the like. The device is battery powered and capable of being controlled from a control panel beneath a weatherproof cover or can be remotely controlled. The device may be controlled in a simple on/off mode of operation or can be controlled by a timer.

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
       [0001]    This application is a continuation-in-part of U.S. patent application Ser. No. 11/441,902 filed May 26, 2006 and which claimed priority from U.S. Provisional Application No. 60/684,901 filed on May 26, 2005. This application relates to a visual marker for hunters and outdoorsmen. The entire disclosure contained in U.S. Provisional Application No. 60/684,901 including the attachments thereto, is incorporated herein by reference. 
     
    
     BACKGROUND OF THE INVENTION 
       [0002]    1. Field of the Invention 
         [0003]    This device relates generally to visual marker to assist in navigation in near to total dark situations. More particularly, this device relates to a visual marker utilizing LED bulbs to assist hunters and outdoorsmen in locating the marked location without disturbing dichromatic nocturnal wildlife. 
         [0004]    2. Problems in the Art 
         [0005]    Hunters and outdoorsmen have long been plagued by the problem of finding their way in the dark. Hunters especially face this problem in locating tree stands or hidden equipment. This problem creates safety concerns since many hunters and outdoorsmen have lost their way at night due to the near total darkness in the wilderness. This problem has resulted in hunters becoming lost resulting in injury and sometimes death. 
         [0006]    The prior art contains numerous references to inventions to assist people to locate marked locations or guide them along paths. However, none of the reviewed prior art provide a visual marker that can be seen from multiple angles, produces a light that is invisible to nocturnal wildlife yet visible to humans, contains a timer, and can be remotely controlled. 
         [0007]    U.S. Patents Application 20020152948 (published Oct. 24, 2002) and U.S. Pat. No. 6,264,335 (Jul. 24, 2001) describe the use of reflective markers to aid in night navigation in the wilderness. However, both require that the hunter use an external light source that must be reflected. This approach contains several problems for hunters in that the light must be directed to a reflector whose location may not be readily apparent. Also, the movement of the light while searching for reflective markers could startle the hunter&#39;s prey. The present invention offers both a light source that is stationary and will be noticed by the hunter without by a visual search and offers a light source that will not alarm wildlife. 
         [0008]    U.S. Pat. Nos. 7,046,160 (May 16, 2006); 6,995,681 (Feb. 7, 2006); 6,992,591 (Jan. 31, 2006); 6,511,203 (Jan. 28, 2003); and 6,137,396 (Oct. 24, 2000) are illustrative of the use of LED&#39;s as portable warning lights or markers or beacons. However, each fail to mention potential uses for hunters and more specifically fail to describe the method of restricting the wavelength of light emitted to that which cannot be detected by dichromatic animals. 
       SUMMARY OF THE INVENTION 
       [0009]    The present invention utilizes LED bulbs which consume little energy and produce light which will not alarm nocturnal wildlife. Preferably, the LED emit light of the device is provided with a sturdy casing which possesses at least one LED bulb. The LED bulb or bulbs are situated such that the light can be easily seen from all sides of the device. The device also incorporates a timer mechanism so that the device can be activated at a present time. The timer is preferably silent. The device can also be constructed to be activated remotely upon command. 
         [0010]    The device is of sturdy construction and is also weather proof. The operating keypad can be hidden from view and protected from the elements by a simple hinged or sliding cover. 
         [0011]    The light from the LED bulb is capable of detection by the human eye from a considerable distance in near total darkness. Additionally, the wavelength of light emitted by a NP-LED is of such that the human eye has minimal readjustment to darkness after being exposed to this wavelength of light. 
         [0012]    Accordingly, those skilled in the art will appreciated that the concept upon which this invention is based may readily be utilized as a basis for the design of other structures, methods, and systems for carrying out the several purposes of the present invention. It is important, therefore, that the claims and specification be regarded as including such equivalent constructions insofar as they do not depart from the spirit of the present invention. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS  
         [0013]    Additional utility and features of the invention will become more fully apparent to those skilled in the art by reference to the following drawings, which illustrate the primary features of the preferred embodiment and numerous alternative embodiments. 
           [0014]      FIG. 1  is a perspective view of the present invention viewed from the front of the device. 
           [0015]      FIG. 2  is an exploded perspective view of the present invention. 
           [0016]      FIG. 3  is a perspective view of base of the present invention with the cover in place. 
           [0017]      FIG. 4  is a perspective view of the front of the present invention with the cover removed. 
       
    
    
     GLOSSARY 
       [0018]    When a wavelength of light is described as “at or about” a specified wavelength, the term “at or about” encompasses a range of +/−25 nm. 
         [0019]    When a wavelength of light is described as “about” a specified range of wavelengths, the term “about” encompasses a variation of +/−5 nm at either end of the range. 
       DETAILED DESCRIPTION OF THE INVENTION  
       [0020]    Neutral-Points in Dichromatic Animals 
         [0021]    a. General 
         [0022]    In accordance with one embodiment of the invention, neutral-point light emitting diodes (hereafter “NP-LED”) are provided. A NP-LED emits a spectrum of photopic light of high visibility to a trichromatic human but of low visibility to deer and other dichromatic animals. The materials allow a human to remain inconspicuous to animals being observed or hunted, while at the same time being highly visible to other human beings, thereby avoiding the danger of the human being mistaken for a target animal. This effect is achieved by creating photopic light emissions at wavelengths of light at or about the neutral point of a dichromatic animal. The neutral point of a dichromatic animal is the wavelength of monochromatic light at which the two populations of color photoreceptors are equally stimulated. Whereas to a human, such a material appears in stark contrast to natural backgrounds, to a dichromatic animal it closely resembles the appearance of the natural background. 
         [0023]    A forest or other natural background is perceived differently by humans and dichromatic animals. A human perceives a forest as a mixture of many colors including greens, browns and beiges. A dichromat, however, sees a much more restricted range of colors. As discussed supra, a dichromat can perceive only two primary colors, blue and yellow, with gradations of colorlessness in between. Most of the typical forest colors occur toward the yellow end of the spectrum. These colors are seen by the dichromat not as gradations of different colors, such as browns, greens and beiges, but as shades of dull gray tinged with varying degrees of yellow. 
         [0024]    NP-LED emissions are much less conspicuousness to animals than white light but offer a comparable degree of safety. To humans, which have no neutral point, the light at the neutral point appears intensely colored and bright. For example, monochromatic light at the deer&#39;s neutral point of 480 nm would appear as an intense and bright blue/green color to humans. By contrast, to deer, light at the neutral point appears dull gray. 
         [0025]    The different perceptions of humans and dichromatic animals to a natural background and a neutral-point material give rise to an effective beacon. A human sees the neutral-point material as an intense, bright monochromatic color against a background of browns, tans, yellow, greens and beiges. A dichromatic animal sees the neutral-point material as a dull gray against a background comprising varying shades of gray and very muted colors. A beacon emitting light at or about the neutral-point is therefore highly visible to other humans and highly inconspicuous to dichromatic animals. 
         [0026]    b. Monochromatic NP-LEDs 
         [0027]    In one embodiment, a NP-LED is constructed such that its photopic light emissions lie predominantly within a single band of wavelengths at or about the neutral point of a dichromatic animal. The neutral points of dichromatic animals measured to-date lie in a range from about 470-510 nm. In a preferred embodiment, the desired spectral band of wavelengths is at or about 480 nm, this being the neutral point of deer. (See Example 1.) 
         [0028]    Monochromatic neutral-point photopic light emissions lie predominantly at or around 480 nm and appear as a bright blue/green color to humans, but a dull gray to deer. The dull gray color provides inhibits detection by deer in a wide variety of natural settings. 
         [0029]      FIG. 1  depicts several of the principal components of the present invention. The LED bulbs  1  of the beacon device  100  are mounted at the base  40  of the device. Preferably the LED bulbs  1  are affixed to an LED bulb assembly  2  that juts from the base  40  of the device  100 . The LED bulbs  1  are preferably spaced approximately 120° apart around a circular plane of the LED bulb assembly  2 . A loop  21  is affixed to the top  20  of the beacon  100  to allow suspension from a nail, screw, branch, rope, or other mounting means. The beacon device  100  is intended to be placed into operable use with the base  40  positioned below the top  20  of the beacon  100  such that the view of the LED assembly  2  is not obstructed when viewing the suspended beacon  100 . The face cover  3  is clearly shown to hide and protect the face  4  of the beacon  100 . 
         [0030]      FIG. 2  depicts an exploded view of the beacon  100  with the principal components displayed. The cover  3  is shown to have cover tabs  5  which are curved toward the rear  30  of the beacon  100  secure the face cover  3  to the base  40  of the beacon  100  by sliding the curved cover tabs  5  over the curved bottom of the base  40 . Beneath the face cover  3 , the battery compartment  6  is depicted covered by a battery compartment cover  7  which attaches to the face  4  of the beacon  100 . The face is further shown to possess component cut-outs  8  for the display cover  9 , the button covers  10 , and the integrated display/control mechanism  11  that preferably includes a microprocessor, a timer, a receiver, buttons, and associated circuitry that need not be depicted individually since they are well known to those skilled in the art. 
         [0031]    The face  4  is further depicted to provide the LED bulb face housing  13  of the LED bulb assembly  2 . Two of the LED bulbs  1  are depicted as being protruding through LED bulb face housing  13  of the LED bulb assembly  2 . The rear cover  12  is shown to provide the LED bulb rear housing  14  of the LED bulb assembly  2 . Another LED bulb  1  is depicted in position to protrude through the LED bulb rear housing  14  of the LED bulb assembly  2  when assembled. 
         [0032]    The spaced arrangement of the LED bulbs  1  provides viewing from numerous angles relative to the beacon  100 . The LED bulbs  1  are bright enough to be seen at a considerable distance, yet not alarming to wildlife due to the wavelength of light emitted. LED bulbs  1  are extremely conservative with power therefore the beacon  100  could remain in place for many days. 
         [0033]    Preferably the beacon  100  can be controlled remotely as well as directly by the user. A remote control or proximity signal could easily be incorporated into the beacon controls and circuitry and such technology is well known to those skilled in the art. The beacon  100  could also be used on a timed basis using simple timer mechanisms and/or circuitry. 
         [0034]    An additional embodiment would allow the beacon&#39;s  100  integrated display/control mechanism and circuitry  11  to control satellite beacons. This control could either be wireless or wired as such technology is well known to those skilled in the art and widely available on a commercial basis. 
         [0035]    Preferably the face cover  3 , rear cover  12  and face  4  are constructed of sturdy materials suitable for outdoor use such as plastic, metal, metal alloys, fiberglass, and ceramics to name a few such materials. The face cover  3  provides a weatherproof seal from rain and other elements when attached to the face  4 . Ideally the face cover  3  will be hingedly attached to the face  4  or rear cover  12 .