Abstract:
A bulb adapted with an infrared sensor includes a LED and a power switch, the switch being turned on to light the LED in the bulb when the sensor detects the heat emitted from a human body and turned off to kill the light when failing to detect the heat for practical use and energy saving purposes.

Description:
BACKGROUND OF THE INVENTION  
       [0001]     (a) Technical Field of the Invention  
         [0002]     The present invention is related to a bulb with sensing function, and more particularly to one adapted with an infrared sensor to control on and off of the bulb for energy saving purpose.  
         [0003]     (b) Description of the Prior Art  
         [0004]     Advanced technology and discoveries of the principles of infrared help the development of more and more infrared-based products. When a bulb is adapted with an infrared sensor to detect the heat radiation, it achieves the practical and energy saving purpose. The bulb adapted with infrared sensor has been very popular in an age of surging awareness of environmental protection.  
         [0005]     The bulb with sensing function of the prior art has an infrared sensor as the power switch of the light source of the bulb. When anyone enters into the range of the sensor, the sensor detects the heat emitted from the human body and turns on the bulb. When that person is out of the sensing range or motionless, the sensor controls the internal circuit to cut off the power supply to the bulb for saving energy. However, the bulb itself generates heat when turned on to confuse the infrared sensor. Therefore, the sensor and the bulb must be separately provided as taught in Publication No. 271806 (Taiwan Gazette) of a patent application titled “Burglarproof and Easy Assembly Lamp Holder”. Nonetheless, the separation of the bulb and the sensor prevents the installation of a shade to the bulb since the shade would block the detection of the movement outside the shade to compromise the working range of the sensor.  
       SUMMARY OF THE INVENTION  
       [0006]     The primary purpose of the present invention is to provide an improved construction of a bulb adapted with an infrared sensor by having installed the infrared sensor inside the bulb with a certain part of the sensor protruding out of the shell of the bulb. An LED is used instead of a conventional bulb so to eliminate the problem that the heating bulb affects the sensitivity of the sensor. LED is known for lower power consumption and longer service life to significantly promote the light quality of the present invention while permitting easy installation simply by placing the LED bulb of the present invention on the existing bulb base. Furthermore, the use of the shade will not affect the sensing function of the sensor.  
         [0007]     The foregoing object and summary provide only a brief introduction to the present invention. To fully appreciate these and other objects of the present invention as well as the invention itself, all of which will become apparent to those skilled in the art, the following detailed description of the invention and the claims should be read in conjunction with the accompanying drawings. Throughout the specification and drawings identical reference numerals refer to identical or similar parts.  
         [0008]     Many other advantages and features of the present invention will become manifest to those versed in the art upon making reference to the detailed description and the accompanying sheets of drawings in which a preferred structural embodiment incorporating the principles of the present invention is shown by way of illustrative example.  
     
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0009]      FIG. 1  is an exploded view of a preferred embodiment of the present invention.  
         [0010]      FIG. 2  is a perspective view of the preferred embodiment of the present invention.  
         [0011]      FIG. 3  is a sectional view of the preferred embodiment of the present invention.  
         [0012]      FIG. 4  is an exploded view of another preferred embodiment of the present invention.  
         [0013]      FIG. 5  is a perspective view of another preferred embodiment of the present invention.  
         [0014]      FIG. 6  is a sectional view of another preferred embodiment of the present invention.  
         [0015]      FIG. 7  is a sectional view of another preferred embodiment yet of the present invention.  
     
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS  
       [0016]     The following descriptions are of exemplary embodiments only, and are not intended to limit the scope, applicability or configuration of the invention in any way. Rather, the following description provides a convenient illustration for implementing exemplary embodiments of the invention. Various changes to the described embodiments may be made in the function and arrangement of the elements described without departing from the scope of the invention as set forth in the appended claims.  
         [0017]     Referring to  FIGS. 1 through 5 , the present invention is essentially comprised of a base  10 , a lampshade  20 , a circuit board A 30 , a control panel  40 , a condensing shade  50 , an infrared sensor  60 , and multiple high-power light emitting diodes (LEDs)  70 .  
         [0018]     Both of the infrared sensor  60  and those high-power LEDs  70  are mounted to the circuit board A 30  with the sensor  60  secured at the center of the circuit board A 30  and those LEDs  70  arranged on the circumference of the circuit board A 30 . The circuit board A is mounted to the base  10  and the lamp shade  20  made see-through covers up the base  10 . The condensing shade  50  covers the sensor  60  and is inserted onto with the top protruding from the circuit board the circuit board A 30 . An electronic device on the control panel  40  receives signals transmitted form the sensor  60  to control the operation of the LEDs  70 . The time to go off of the LEDs  70  is controlled by regulating a variable resistance  41  disposed on the control panel  40 . A resistance  80  is connected from the control panel  40  to a metal part at the bottom of the base  10  to regulate the power transmission.  
         [0019]     To provide more light projection sources and expend the light emitting coverage, an additional circuit board B 31  is provided as illustrated in  FIG. 4  with multiple general LEDs  71  or ultra flux LED lamps  72  arranged on the circumference of the circuit board B 31  at a certain inclination to increase the projection area in conjunction of a funnel shaped reflection hood  90  and a base plate  91 .  
         [0020]     Whereas the general infrared sensor  60  works by detecting the heat radiation from a human body, the sensitivity of the sensor  60  is affected by the heat generated from a conventional tungsten lamp. In the present invention, instead of a tungsten lamp, the LED  70 , is used to take advantage of its feature of maintaining constant temperature while being lighted without separating the LED  70  and the sensor  60 . A through hole is provided at the center of the lampshade  20  for the detection range of the sensor  60  to maintain effective coverage to its maximum. The through hole permits the front end of the condensing shade  50  to stay out of the lampshade  20  while the sensor  60  is paid effective sensing range due to the web tangent at the top of the inside the condensing shade  50 .  
         [0021]     The present invention provides the following advantages: 
        1. Lower cost and easier installation allow direction installation to a general bulb base or built-in bulb base, and use in conjunction with a lampshade.     2. LED lamps are used for saving power consumption, providing longer service life and maintaining at a constant temperature without affecting the sensitivity of the sensor.     3. The LEDs are turned on as long as the sensor picks up the presence of a human body to achieve the purpose of energy saving.     4. Wide light projection coverage close to that offered by the conventional bulb.        
 
         [0026]     It will be understood that each of the elements described above, or two or more together may also find a useful application in other types of methods differing from the type described above.  
         [0027]     While certain novel features of this invention have been shown and described and are pointed out in the annexed claim, it is not intended to be limited to the details above, since it will be understood that various omissions, modifications, substitutions and changes in the forms and details of the device illustrated and in its operation can be made by those skilled in the art without departing in any way from the spirit of the present invention.