ILLUMINATION DEVICE HAVING LASER SOURCE

An illumination device includes a laser source, a splitter, a fluorescent member, and a reflector group. The laser source emits laser beams. The splitter divides the laser beams into three parts. The fluorescent member includes phosphor. The reflector group reflects the three parts of the laser beams to the fluorescent member from different directions to excite the phosphor in the fluorescent member.

DETAILED DESCRIPTION

Embodiments of an illumination device in accordance with the present disclosure will now be described in detail below and with reference to the drawings.

Referring toFIG. 1, an illumination device10in accordance with a first embodiment of the disclosure includes a laser source100, a fluorescent member200, a splitter300, and a reflector group400.

The laser source100emits laser beams having a narrow spectrum. In this embodiment, the laser source100is a laser light emitting diode and emits blue laser beams.

The fluorescent member200is located at a top of a right side of the laser source100. In this embodiment, a cross section of the fluorescent member200is rectangular. The fluorescent member200is a mixture mixed with resin and phosphor210. The fluorescent member200includes a top surface220, a bottom surface230opposite to the top surface220, and lateral surfaces connecting lateral edges of the top surface220and the bottom surface230. The lateral surfaces include a left surface240and the right surface250opposite to the left surface240. In this embodiment, the phosphor210is a yellow phosphor and material thereof is selected from sulfide phosphor, silicate phosphor, nitride phosphor, nitrogen oxides phosphor, or yttrium aluminum garnet (YAG) phosphor.

The splitter300is located between the laser source100and the fluorescent member200to divide the laser beams emitted from the laser source100to a plurality of parts. In this embodiment, the splitter300is an optical waveguide splitter and divides the laser beams emitted from the laser source100into a first part110, a second part120and a third part130. The first part110, the second part120and the third part130have the same intensity.

The reflector group400is located at light paths of the first part110, the second part120and the third part130to reflect the first part110, the second part120and the third part130to the fluorescent member200. In this embodiment, the reflector group400includes a first reflector410located at the light path of the first part110, a second reflector420located at the light path of the second part120, and a third reflector430located at the light path of the third part430. The first reflector410is located at a bottom of a left side of the fluorescent member200to vertically reflect the first part110upwardly. The reflector group400further comprises a fourth reflector440located at a top of the first reflector410. The fourth reflector440reflects the laser beams vertically reflected by the first reflector410to the left surface240. In this embodiment, the first reflector410and the fourth reflector440are spaced and parallel to each other. The fourth reflector440reflects the laser beams to the left surface240in parallel.

The second reflector420is located at a bottom of a right side of the fluorescent member200to reflect the second part120to the right surface250of the fluorescent member200. In this embodiment, the second reflector420slantwise reflects the second part120to the right surface250. The third reflector430is located at a bottom of the bottom surface230to reflect the third part130to the bottom surface230. In this embodiment, the third reflector430vertically reflects the third part130to the bottom surface230.

It is understood, in other embodiment, the number of the reflectors and positions of the reflectors are adjustable according to requirements of the other embodiment as soon as the laser beams are reflected to the fluorescent member200.

In operation, the laser source100is powered on and emits the laser beams oriented towards the splitter300, the splitter300divides the laser beams to the first part110, the second part120and the third part130, and the first part110, the second part120, and the third part130are reflected by the reflector group400to the fluorescent member200to excite the phosphor210to obtain white light. The white light radiates from the top surface220, the bottom surface230and the lateral surfaces of the fluorescent member200to illuminate. Thus overall, the illumination device10has a radiation angle approaching 360 degrees.

Because the intensity of the first part110, the second part120and the third part130are equal, and the first part110, the second part120and the third part130excite the phosphor210from different sides of the fluorescent member200, the phosphor210located at different sides of the fluorescent member200is evenly excited. Thus, the white light evenly radiates from sides of the fluorescent member200.

Referring toFIG. 2, an illumination device20of a second embodiment is shown. The illumination device20is similar to the illumination device10, differences therebetween are that a covering500is located at a top of the fluorescent member200and covers the top surface220. The covering500is arc-shaped. The covering500reflects the laser beam radiated out from the top surface220into the fluorescent member200. The laser beam reflected by the covering500radiates out from the bottom surface230and the lateral surfaces. Because a part of the laser beams are reflected into the fluorescent member200, more phosphor210of the fluorescent member200is excited relative to the first embodiment.