as required , detailed embodiments of the present invention are disclosed herein ; however , it is to be understood that the disclosed embodiments are merely exemplary of the invention which may be embodied in various forms . therefore , specific structural and functional details disclosed herein are not to be interpreted as limiting , but merely as a basis for the claims and as a representative basis for teaching one skilled in the art to variously employ the present invention in virtually any appropriately detailed structure . reference is now made to the drawings wherein like characteristics and features of the present invention shown in the various figures are designated by the same reference numerals . fig1 depicts a perspective view of the inventive sonic fishing lure 10 which includes a main body portion 11 , a nose portion 12 , and a tail portion 13 . the overall shape of the sonic fishing lure 10 is not necessarily critical to the operation of the invention and may , therefore , comprise any of the well - known shapes that a conventional deep - water , mid - water , or surface - water fishing lure has in the past assumed . however , the overall shape depicted in fig1 is that of a tested and proven streamlined configuration which easily cuts through water and because of its downward extending head portion maintains a substantially constant level within the water . it is important that the outside shell of the sonic fishing lure 10 be hermetically sealed so as to protect the internal components thereof from the adverse effects of the water environment within which the sonic fishing lure 10 is used . typical fishing hooks 14 may be connected to any convenient location on the body of the sonic fishing lure 10 . in the illustrated example one fishing hook is placed at eye 19 at the tail portion 13 while a second fishing hook is placed at eye 19 at the mid - bottom portion of the center portion 11 of sonic fishing lure 10 . similarly , the fishing line 15 may be appropriately connected to the eye 19 at the front or nose piece 12 of the sonic fishing lure 10 . fig2 is a cross - sectional plan view of the inventive sonic fishing lure 10 illustrating one arrangement of the layout of the internal components . the main body 11 of the inventive sonic fishing lure 10 may be considered to comprise three parts , the mid - body portion 16 , the front body portion 17 and the back body portion 18 . each portion is , of course , contiguous with the other portions and together form a generally one - piece main body 11 . a first wall 24 separating back portion 18 from midportion 16 together with a hollow tail cap 38 forms a battery chamber 25 . as illustrated in fig2 of the drawings , cap 38 is threadingly connected 31 to back body portion 18 . a seal such as an o - ring seal 32 is used to seal the connection between cap 38 and back body portion 18 . in this manner battery chamber 25 comprises a water - proof hollow chamber . within chamber 25 , are located three series connected dc batteries 20 of , for example , 1 . 5 volts each which together yield a total output of 4 . 5 volts . each battery 20 may typically comprise a hearing aid battery , such as a type 675 , for sonic fishing lures having an overall size of approximately two - to - four inches . for larger larger sonic fishing lures , a greater number of larger and more powerful batteries may be utilized . the negative connection 21 of the series connected batteries 20 may be accomplished in any conventional manner such as by a metallic spring imbedded in a bored out top portion of cap 38 and by which when cap 38 is screwed into sealing contact with back body portion 18 , an electrical contact is made with the negative end of the stack of batteries 20 . similarly , a positive electrical connection 34 may be made by a protruding contact imbedded within wall 24 which wall is located between front 17 and mid 16 body portions of fishing lure 10 . electrical wires 22 and 23 connect the positive and negative connections 34 and 21 to batteries 20 with the electrical circuitry of the sonic fishing lure 10 at connections 28 and 29 within an electrical circuit chamber 26 . wires 22 and 23 may be imbedded , respectively , within cap 38 and mid - body portion 16 during the process of manufacturing the respective components . or , may comprise insulated wires passing through an opening in wall 24 . such technology is well known and need not be repeated within this specification . within the electrical circuit chamber 26 , which is also a sealed air - tight chamber , is located an electronic circuit mounting board 27 . circuit board 27 may comprise a pc board to which is mounted the various electronic components of the circuitry as more fully explained hereinafter . the output of the electric circuit is input into a sonic transducer 30 which outputs the sound which is attractive to fish . sonic transducer 30 is mounted , in the example shown , within a wall 33 connecting the front body portion 18 to the mid - body portion 16 of the sonic fishing lure 10 . a seal 35 surrounds the cylindrical body of sonic transducer 30 so as to form a fluid tight seal between a sonic chamber 36 and the mid - body body or electrical circuit chamber 26 . seal 35 may simultaneously fit within grooves in the cylindrical body of sonic transducer 30 and in a circular cutout within wall 33 to form a good seal and aid in maintaining the fixed position of transducer 30 . connections 37 and 38 of sonic transducer 30 may be used to connect the output signal from the electric circuit of the sonic fishing lure 10 to sonic transducer 30 . sonic chamber 34 is completely filled with a fluid such as distilled water and is , therefore , in fluid contact with the exterior surface of sonic transducer 30 and the interior surface of sonic chamber 34 . the sound output from sonic transducer 30 is , therefore , fluid coupled between sonic transducer 30 and the fluid within chamber 34 and also fluid coupled to the walls of chamber 34 by the fluid contained therin . this fluid coupling provides for an efficient transmittal of sound from the interior of sonic fishing lure 10 to the water surrounding the same by another fluid coupling comprising the contact of the water within which the sonic fishing lure 10 is to be used and the outer skin of primarily the tail portion 18 of sonic fishing lure 10 . sonic transducer 30 is shown in cross section in fig3 of the drawings . sonic transducer 30 may be of a type comprising a vibrating plate which is activated by an electrical coil . accordingly , sonic transducer 30 may , for example , comprise a qmb - 111 series transducer manufactured by star incorporated , but as modified as hereinafter described . an axial shaft 40 is fixedly connected to and perpendicular with the center portion of the disk 41 within sonic transducer 30 . the other end of rod or shaft 40 is fixedly connected to a second disk 42 in a manner similar to the connection to disk 41 . the effect of combination of disks 41 and 42 as coupled by and separated by shaft or rod 40 is to increase significantly ( approximately three times more ) the sound output from a standard sonic transducer . cap 43 is used to cover disk 42 and is sealingly connected to cap 44 . disk 42 may comprise a vibrating mass having a diameter of approximately three - quarters of the size of the diameter of disk 41 but a thickness of more than twice that of disk 41 . the length of rod 40 may approximately be equal to the diameter of disk 42 . cap 43 is addition to providing a waterproof connection to the main body of sonic transducer 30 also acts as a sonic resonant chamber . disk 42 and shaft 40 may be made from a material such as ordinary carbon steel having a diameter of 12 millimeters and a thickness of 1 . 5 millimeters , while shaft 40 may be made from piano wire having a thickness of 2 millimeters and a length of 7 millimeters . the flexibility of shaft 40 allows disk 42 to hit the sides of cap 43 to further increase the sound output from transducer 30 . test measurements have verified that a sonic transducer of the type disclosed and described herein results in an increase of the standard output of a qmb - 111 transducer from eighty ( 80 ) decibels at ten ( 10 ) centimeters to over two hundred ( 200 ) decibels at ten ( 10 ) centimeters in the air . underwater tests have verified the increased output of the modified sonic transducer 30 as well as the effectiveness of the sonic coupling aspects of the inventive fishing lure 10 . the electrical circuitry of the sonic fishing lure 10 is shown schematically in block fashion in fig4 of the drawings . an electrical source comprising batteries 20 are connected to a first astable multivibrator 47 the output of which is connected to a second astable multivibrator 48 whose output in turn is connected to sonic transducer 30 . astable multivibrator 47 outputs a signal of approximately one ( 1 ) hertz while a second astable multivibrator 48 outputs a signal of approximately one hundred ( 100 ) hertz . the output signal of vibrator 48 and , therefore , the output signal of sonic transducer 30 are pulsed as shown in fig5 of the drawings . it has been determined that intermittently pulsed outputs at approximately one hundred ( 100 ) hertz which lasts for a duration of approximately 700 milliseconds and separated by a non - sound producing time of approximately 200 millisecond has been more effective to attract fish as compared to a continuous signal . the pulsed sonic output is , of course , constantly repeated while the inventive fishing lure is being used within a body of water to attract and catch fish . the pulsed sound output by the inventive fishing lure 10 is able to be distinguished by fish over the ever present normal background noise within bodies of water . furthermore , the pulsed output tends to simulate sounds output by a fish in distress which also outputs an intermittent sound . in this manner the inventive fishing lure appears to be a fish in distress to the fish within the vicinity of the sonic fishing lure 10 . in accordance with the features provided by the inventive sonic fishing lure 10 to efficiently maximize the sound output by the sonic fishing lure 10 , a highly effective fishing lure is presented . a fluidic coupling of chamber 34 in combination with the vibrating mass of the improved sonic transducer 30 together output a relatively intense sound which travels over relatively large distances . while the invention has been described , disclosed , illustrated and shown in certain terms or certain embodiments or modifications which is has assumed in practice , the scope of the invention is not intended to be nor should it be deemed to be limited thereby and such other modifications or embodiments as may be suggested by the teachings herein are particularly reserved especially as they fall within the breadth and scope of the claims here appended
a new and improved sonic fishing lure is disclosed . an energy source , an electrical circuit , and a sonic transducer are each respectively contained within chambers of a generally hollow cylindrically - shaped fishing lure . due to the construction of the fishing lure , the sound output from the fishing lure is of a greater intensity and is produced for a longer period of time than that of prior art devices . the sound output from a coil activator vibrating plate type of transducer is enhanced by the addition of a second vibrating plate . a fluid connection between the outer surface of the sound transducer and the body of the fishing lure further enhances and intensifies the sound output by the fishing lure .