A light source module including first and second light sources, first and second wavelength conversion units, and first and second light splitting units is provided. The first light source emits a first light having a first wavelength. The first wavelength conversion unit converts at least one portion of the first light into a first converted light having a second wavelength. The second light splitting unit allows the lights having the second and third wavelengths to travel through and reflects the light having the first wavelength. The second light source emits a second light having the first wavelength. The second wavelength conversion unit converts at least one portion of the second light into a second converted light having the third wavelength. The first light splitting unit is disposed between the first and second wavelength conversion units and reflects the first wavelength and allows the second wavelength to travel through.

A light source module includes a light source, a fluorescent ring, a reflector, and a driving device. The light source is configured to emit light. The fluorescent ring has an inner surface. The reflector is configured to reflect the light to form a light spot on the inner surface. The driving device is configured to rotate the reflector to cause the light spot to move along a circular path on the inner surface.

A phosphor wheel and a projection apparatus with the phosphor wheel are disclosed. A phosphor wheel includes a driving motor, a temperature interference element, a substrate and at least one light wavelength converting layer. The driving motor includes a motor body and a rotating member. The motor body drives the rotating member to rotate relative to the motor body along a rotation axis. The temperature interference element is connected with the rotating member and the substrate. The motor body drives the rotating member to rotate the temperature interference element and the substrate relative to the motor body. The substrate includes a first surface and a second surface disposed opposite to each other. The second surface is located between the first surface and the rotating member. The light wavelength converting layer is disposed on the first surface of the substrate.

A phosphor wheel comprises a disk, a wavelength conversion layer comprising phosphor disposed on the disk, and an impeller disposed on the disk. The impeller comprises vanes which are shaped as airfoils with each vane oriented to drive outward airflow across the disk and across the wavelength conversion layer when the disk is rotated in the rotation direction. The wavelength conversion layer may be disposed at a larger radial position than the impeller on the disk, and may optionally be an annular wavelength conversion layer. In operation, a light source is arranged to output a pump beam impinging on the wavelength conversion layer while the disk rotates.

A wavelength conversion module is configured to receive an excitation beam. The wavelength conversion module includes a substrate and a wavelength conversion material arranged on the substrate. The substrate includes a ring-shaped light irradiation region, and the wavelength conversion material is annularly arranged on at least part of the ring-shaped light irradiation region. A first color light obtained through conversion when the excitation beam is incident to the wavelength conversion material of the ring-shaped light irradiation region in a first time sequence has a first light intensity, the first color light obtained through conversion when the excitation beam is incident to the wavelength conversion material of the ring-shaped light irradiation region in a second time sequence has a second light intensity, and the first light intensity and the second light intensity are different. In addition, a projection device is also provided.

A wavelength conversion element includes a base plate and a plurality of wavelength conversion layers. The base plate has a plurality of wavelength conversion regions. The plurality of wavelength conversion layers are respectively disposed on the wavelength conversion regions. The wavelength conversion layers are sintered and connected together. The invention also provides a projection device having the wavelength conversion element and a manufacturing method of the wavelength conversion element. The wavelength conversion element of the invention can have good conversion efficiency and long service life, so that the projection device with the wavelength conversion element can provide a good image quality.

An illumination system, an illumination control method and a projection apparatus are provided. The illumination system includes a first laser light source providing a first laser beam, and a light splitting module. When the first laser beam is incident to the light splitting module, a first portion of the first laser beam penetrates through the light splitting module, a second portion is reflected by the light splitting module. In the first illumination mode, the first laser beam is incident to the first light splitting region to form a first proportion of the first portion and the second portion. In the second illumination mode, the first laser beam is incident to the first light splitting region to form a second proportion of the first portion and the second portion, wherein the first proportion and the second proportion are different.

A light-source optical system includes a wavelength converter on which light of first color is incident, the wavelength converter converting at least a part of the light of first color into light of second color different from the light of first color, a first optical system disposed upstream from the wavelength converter on an optical path of the light of first color, the first optical system including optical elements, a reflection plane disposed downstream from the first optical system on the optical path, and a second optical system disposed downstream from the reflection plane on the optical path. The reflection plane reflects one of the light of first color and the light of second color, and a conditional expression “0<ΔL/D<0.2” is satisfied.

A heat dissipation module is for a wheel module with a motor. The heat dissipation module includes a supporting member and a fan. The supporting member has a supporting portion, a fixing portion and connecting portions. The fixing portion is located in a ventilation hole of the supporting portion and connected to the supporting portion by the connecting portions. The fixing portion has opposite first and second side surfaces. The first side surface is connected to the motor. The fan is disposed on the second side surface. The fan has an air outlet facing the ventilation hole. On a plane parallel to the first side surface, the air outlet and the ventilation hole partially overlap, a cross-sectional area of the ventilation hole is greater than that of the fixing portion, and the cross-sectional area of the fixing portion is greater than or equal to that of the motor.

A prism block includes a first prism having first, second and third surfaces, a second prism having a fourth surface parallel to the first surface, a fifth surface facing the second surface, and a sixth surface, a third prism having seventh and eight surfaces respectively facing the second and fifth surfaces, and an optical path separation coating disposed between the fifth and eighth surfaces. Illumination light incident on the third surface is reflected by the second surface, and is emitted from the first surface. Projection light incident on the first surface is emitted from the fourth surface. Imaging light incident on the fourth surface is reflected by the optical path separation coating, and is emitted from the sixth surface. A projection axis plane including optical paths of the illumination light and the projection light, and an imaging axis plane including an optical path of the imaging light intersect each other.