Patent Publication Number: US-2011050651-A1

Title: LED Stylus Pen

Description:
BACKGROUND OF THE INVENTION 
     a) Field of the Invention 
     The present invention relates to an LED stylus pen, and more particularly to an LED stylus pen wherein a button is defined at topmost of the stylus pen and when the button is pushed down, a switch is actuated to provide power for the LED to emit light. 
     b) Description of the Prior Art 
     An ordinary conventional stylus pen is used for touching a touch screen, allowing an LED at a front end of the stylus pen to emit light. The LED light will be emitted as long as the stylus pen touches the touch screen; however, sometimes a user will not want that the light is emitted when touching the touch screen due to work, therefore, the conventional stylus pen cannot comply with the user&#39;s requirement. Furthermore, conventional LED is used for touching a touch screen, which is easy to scratch a surface of screen. In addition, two ordinary 1.5V batteries used to supply power will have an insufficient electric current as electricity is consumed, resulting in degeneration of LED brightness or even ill induction or power-down. 
     SUMMARY OF THE INVENTION 
     The primary object of the present invention to provide an LED stylus pen wherein a button is fitted on top of the stylus pen, a circuit board is fitted on interior of the lamp tube, a writing nib is connected to the end of the lamp tube, the LED at one end of the circuit board is located in the lamp tube. As the LED light is emitted in a tube of the writing nib which is used to replace the LED when the touch screen is touched, it can avoid scratching the screen. When the button is pushed down to turn on an LED switch that a conductive spring is pressed down to touch an anode of a battery, and if the writing nib touches a touch screen such that a conductor touches a cathode of the battery, then the LED can emit light. Therefore, the pen of the present invention is provided with an effect to control the LED to emit light by touching. 
     To enable a further understanding of the said objectives and the technological methods of the invention herein, the brief description of the drawings below is followed by the detailed description of the preferred embodiments. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  shows a schematic view of the present invention. 
         FIG. 2  shows an exploded view of the present invention. 
         FIG. 2-1  shows a front elevational view of the circuit board of the present invention. 
         FIG. 2-2  shows a rear elevational view of the circuit board of the present invention. 
         FIG. 3  shows a cross-sectional view of the present invention. 
         FIG. 4  shows a cross-sectional view of the present invention, wherein a button is pushed down to turn on an LED switch. 
         FIG. 5  shows a cross-sectional view of the present invention, wherein a touch screen is touched to allow an LED to emit light. 
         FIG. 6  shows an exploded view of an embodiment of the present invention. 
         FIG. 7  shows a cross-sectional view of an embodiment of the present invention. 
         FIG. 8  shows a cross-sectional view of an embodiment of the present invention, wherein a button is pushed down to turn on an LED switch. 
         FIG. 9  shows a cross-sectional view of an embodiment of the present invention, wherein a touch screen is touched to allow an LED to emit light. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Referring to  FIGS. 1 to 3 , the present invention comprises a penholder  10 , a pen nib  20 , a lamp tube  30 , a first spring  40 , a first insulator  50 , a second spring  60 , a second insulator  60 , a metal tube  80  and a button  90 . 
     A lower side of the hollow penholder  10  is connected to the pen nib  20 , an upper side is connected to the metal tube  80 , and the hollow pen nib  20  is fixed by locking an outer thread  21  on a top end with an inner thread  11  at an inner rim of a bottom end of the penholder  10  (as shown in  FIG. 3 ). The hollow lamp tube  30  is located in a pen nib  20 . The helical-shaped first spring  40  is sheathed at an exterior side of the conductor  32  and is locked into the lamp tube  30 . The first insulator  50  is latched on an opening end at a top end of the pen nib  20 . The aforementioned parts are assembled and extended into the penholder  10 , and are located below two 1.5V batteries A which are serially connected in the penholder  10 . The lower-side battery A is abutted above the first insulator  50  and the upper-side battery A is abutted below the second insulator  70  on which is sheathed with the second spring  60 . 
     A tube opening above the penholder  10  is latched with the hollow metal tube  80  which is in contact with the inner rim of the penholder  10 . A button  90  transfixes the metal tube  80  and a bottom end of the button  90  is sheathed with a conductive spring  91  which transfixes the hollow second spring  60  and the second insulator  70 . 
     The present invention is primarily characterized in that a circuit board  100  is fitted on interior of the lamp tube  30 . Referring to  FIG. 2-1 , the terminals at one end of circuit board  100  is in contact with the LED  101 , and the other end a cathode terminals of the circuit board  100  is in contact with the conductor  102 , and the central anode terminals is in contact with the first spring  40  which is sheathed above the circuit board  100 . The LED  101  and the circuit board  100  are located in the hollow lamp tube  30 , the screw rod  31  at one end of the lamp tube  30  is fixed by locking with a lock hole  321  of the writing nib  32 , the LED  101  can not be transfixing the writing nib  32 , but the light of the LED  101  can be shooting from the writing nib  32 , when the lamp tube  30  and writing nib  32  are located in the pen nib  20 , the writing nib  32  can be jutting out the pen nib  20 . A convex periphery  51  at a lower end of the first insulator  50  is fixed with a metal screw ring  52  which is fixed by locking with a lock hole  22  of the metal pen nib  20 . 
     Referring to  FIG. 3 , in a normal time when the button  90  is not pushed down, a conductive spring  91  does not touch the battery A. Referring to  FIG. 4 , on the other hand, when the button  90  is pushed down, the conductive spring  91  will touch the battery A in the penholder  10 . When a user presses the button  90  for a first time, the button  90  can be pushed down, and when the button  90  is pushed again, the restoring spring  91  can bounce back the button  90  to an original position. 
     Referring to  FIG. 2-2  shows a rear elevational view of the circuit board of the present invention, a center of the circuit board  100  is provided with a booster IC  103  and two sides are provided respectively with a capacitance  104  and an inductor  105 , wherein the booster IC  103  controls stability of the current, allowing a capacity of the battery A to be used to a limit. As there is no issue of touch spacing when the LED stylus pen is used each time, the stable brightness of light is developed, enabling the induction to be more stable. 
     Referring to  FIG. 3 , when the button  90  is not pushed down, the conductive spring  91  at a bottom end of the button  90  does not touch an anode of the battery A and is away from the battery A by a distance. When the user uses the writing nib  32  to touch a touch screen B (not shown in the drawing), the LED  101  of the writing nib  32  does not emit light. Referring to  FIG. 4 , when the user pushes down the button  90 , the conductive spring  91  is pressed down to touch the anode of the battery A. Referring to  FIG. 5 , as long as that the user uses the writing nib  32  to touch the touch screen B, the circuit board  100  which is located in the writing nib  32  is connected to a conductor  102  can touch a cathode of the battery A, allowing the LED  31  to emit light. Because the light of the LED  101  from the writing nib  32  be shooting; therefore, the present invention is provided with an advantage that light dots are focused. 
     Referring to  FIGS. 6 and 7 , it shows an exploded view and a cross-sectional view of an embodiment of the present invention, the present invention comprises a penholder  10 , a pen nib  20 , a lamp tube  30 , a first spring  40 , a first insulator  50 , a metal tube  80  and a button  90 . Wherein the button  90  and the conductive spring  91  of the button  90  to become joined as one body with the metal tube  80 , wherein an interior of the metal tube  80  is provided with a electric switch (not shown in the drawings), a conductive spring  91  is constant touched the battery A of the penholder  10 . Referring to  FIG. 8 , when the button  90  is pushed down, the electric switch of the metal tube  80  will be actuated, a user uses the writing nib  32  to touch the touch screen B again (as shown in  FIG. 9 ), the conductor  102  at one end of the circuit board  100  can touch the battery A of the penholder  10 , allowing the LED  101  to emit light. 
     Conclusive from the above, in accordance with the present invention, a button is pushed down and a touch screen is touched that power can be provided to an LED to emit light. The button or a switch is defined at topmost of a stylus pen, and the circuit board are located in the lamp tube, a writing nib is connected to the end of the a lamp tube, the LED at one end of the circuit board is located in the lamp tube, such that when a user pushes down the button and actuating the switch, when the user uses the writing nib to touch the touch screen again, so as to provide power to the LED to emit light.