Lighting system and projection device

Abstract

A lighting system includes a light source, a reflection shade, a wavelength converting element and a light filtering element. The focus of the reflection shade is on an extension line of a transmission path of excited beams provided by the light source. An open pore of the reflection shade is adjacent to the focus. The wavelength converting element is arranged in a manner of penetrating through the open pore and has a light action zone. The light action zone is arranged on the transmission path of the excited beams and is adjacent to the focus of the reflection shade and converts the excited beams to conversion beams. The reflection shade is arranged on the transmission path of the conversion beams from the wavelength converting element. The light filtering element is arranged on the transmission path of the conversion beams of the reflection shade. The conversion beams from the reflections shade cast into the light filtering element in an inclined manner. The light filtering element filters the conversion beams. A projection device is also disclosed. The lighting system provided by the invention has advantages of small size, simple optical path design and the like.

Description

technical field [0001] The invention relates to an illumination system and a projection device. Background technique [0002] The projector uses the laser light emitted by the laser source to excite the phosphor powder in the phosphor wheel, and the phosphor powder can provide converted light beams of different colors by exciting the phosphor powder. Traditionally, before the laser light hits the fluorescent wheel, it passes through a dichroic mirror and then passes to the fluorescent wheel. The function of the dichroic mirror is, for example, to allow a beam of a specific wavelength range of light to pass through and reflect a beam of another specific wavelength range of light. When the laser light passes through the dichroic mirror and is transmitted to the fluorescent powder of the fluorescent wheel, the fluorescent powder is excited by the laser to emit converted beams of different wavelengths. These converted beams are transmitted to the dichroic mirror along the oppos...

AI Technical Summary

Problems solved by technology

However, due to the use of the above-mentioned optical guide elements and the additionally designed light path in the projector, the volume of the projector is relatively large, and its cost is relatively high

[0004] In addition, when the laser continuously irradiates the fluorescent powder on the fluorescent wheel, a large amount of heat energy will be generated, which will lead to the phenomenon that the intensity of the converted light beam generated by the fluorescent powder decreases sharply as the temperature increases, so that the brightness of the projector image decreases with the increase of temperature. The increase of operating time reduces the reliability of the projector (Reliability)

On the other hand, in projectors using laser sources, speckle phenomenon has always been one of the important factors that reduce image quality, and this will cause poor image quality projected by the projector.

Images