LED LIGHT BULB WITH LIGHT-SHIELDING STRUCTURE

A LED light bulb with a light-shielding structure is provided. The LED light bulb includes a bulb base (1), a transparent cover (2), a sensor (3) and a light-shielding barrel (4). The transparent cover (2) is fixed on a top of the bulb base (1). A lower end of the light-shielding barrel (4) is fixed on the bulb base (1). An upper end of the light-shielding barrel (4) is extended upwardly toward the transparent cover (2). A light-shielding element (8) is disposed within an inner hollow portion of the light-shielding barrel (4). A sheltering part (9) is arranged around the light-shielding element (8) for sheltering a portion of the light beam which is refracted to the light-shielding barrel (4) by the transparent cover (2). The sensor (3) is located at a center of the light-shielding element. By the light-shielding barrel (4) and the light-shielding element (8), the light beam emitted by the LED light bulb can be effectively prevented from being directly projected onto the sensor, or the light beam refracted by the transparent cover (2) can be effectively prevented from being projected onto the sensor (3). Since the light beam emitted by the LED light bulb is not received by the sensor (3), the possibility of causing the erroneous operation of the sensor will be minimized, and the sensing accuracy and sensitivity of the LED light bulb will be enhanced.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

The present invention provides a LED light bulb with a light-shielding structure. Hereinafter, the LED light bulb will be illustrated with reference toFIGS. 1-4. The LED light bulb comprises a bulb base1, a transparent cover2, a sensor3, and a light-shielding barrel4. The transparent cover2is fixed on a top of the bulb base1. A lower end of the light-shielding barrel4is fixed on the bulb base1. An upper end of the light-shielding barrel4is extended upwardly toward the transparent cover2. Moreover, the sensor3is disposed within an inner hollow portion of the light-shielding barrel4.

The LED light bulb further comprises a light-shielding element8. The light-shielding element8is disposed within the inner hollow portion of the light-shielding barrel4. Moreover, a sheltering part9is arranged around the light-shielding element8for sheltering the portion of the light beam that is refracted to the light-shielding barrel4by the transparent cover2. The sensor3is located at a center of the light-shielding element8.

The light-shielding element8is embedded into an upper portion of the light-shielding barrel4. Moreover, a top edge of the sheltering part9is higher than, equal to or lower than a top edge of the light-shielding barrel4.

An opening structure10is located at the center of the light-shielding element8. The opening structure10is defined by a cone-shaped surface. The width of the upper end of the opening structure10is larger than the width of the lower end of the opening structure10. That is, the opening structure10is tapered from the upper end to the lower end.

In the transverse section of the opening structure10, the angle between the inner rim of the cone-shaped surface and a vertical line is larger than the angle between the portion of the light beam refracted to the light-shielding barrel4by the transparent cover2and the vertical line. Consequently, the portion of the light beam refracted to the light-shielding barrel4by the transparent cover2will be completely directed to the light-shielding element8. In other words, the light beam cannot be directed into the light-shielding barrel4. Since the light beam is prevented from being projected onto the sensor3, the light beam emitted by the LED light bulb will not interfere with the sensing action of the sensor3. Under this circumstance, the sensing accuracy and sensitivity of the LED light bulb will be enhanced, and the possibility of causing the erroneous operation of the sensor will be minimized.

In accordance with the present invention, by the light-shielding barrel4and the light-shielding element8, the light beam emitted by the LED light bulb can be effectively prevented from being directly projected onto the sensor3. Furthermore, by the light-shielding barrel4and the light-shielding element8, the light beam emitted by the LED light bulb and reflected or refracted by the transparent cover2can be effectively prevented from being projected onto the sensor3. Since the light beam emitted by the LED light bulb is not received by the sensor3, the light beam emitted by the LED light bulb will not interfere with the sensing action of the sensor3. Under this circumstance, the possibility of causing the erroneous operation of the sensor will be minimized, and thus the sensing accuracy and sensitivity of the LED light bulb will be enhanced.

The LED light bulb further comprises a LED circuit board. Moreover, plural LED beads are disposed on the LED circuit board. The LED circuit board is fixed on the top of the bulb base1. The upper end of the light-shielding barrel4is coupled with the bulb base1. The light-shielding barrel4has a simple structure, and is easily assembled.

Moreover, a condenser lens5is coupled with the upper end of the light-shielding barrel4. The light-shielding barrel4has a shape of a hollow cylinder. The curvy surface of the condenser lens5matches the curvy surface of the transparent cover2. Moreover, the junction between the condenser lens5and the transparent cover2is smooth, the contour is smooth, and the appearance is elegant.

Moreover, the transparent cover2has a perforation. The upper end of the light-shielding barrel4is inserted upwardly into the perforation of the transparent cover2.

In a preferred embodiment, the top edge the light-shielding barrel4is at the same level as a top edge of the perforation of the transparent cover2. Consequently, the portion of the light beam refracted to the top edge of the light-shielding barrel4by the transparent cover2will be hindered by the top edge of the light-shielding barrel4. Under this circumstance, the portion of the light beam refracted by the transparent cover2is prevented from being projected onto the sensor3.

Alternatively, in another embodiment, the top edge of the light-shielding barrel4is protruded upwardly over the top edge of the perforation of the transparent cover2. Similarly, the portion of the light beam refracted to the top edge of the light-shielding barrel4by the transparent cover2will be hindered by the top edge of the light-shielding barrel4. Under this circumstance, the portion of the light beam refracted by the transparent cover2is prevented from being projected onto the sensor3.

The bulb base1comprises a heat sink6and a bulb socket7. The bulb socket7is fixed on a lower end of the heat sink6. The transparent cover2, the sensor3and the light-shielding barrel4are fixed on a top of the heat sink6.

The sensor3is located at a lower portion of the opening structure10. Moreover, the sensor3is selected from one of an infrared sensor3, a microwave sensor3and a light sensor3. Of course, the sensor3may be a combination of any two of an infrared sensor3, a microwave sensor3and a light sensor3.