Light source device, and image projection apparatus employing light source device

A light source device, comprising:

• a first light source configured to emit first light having a first wavelength range;
• a second light source configured to emit second light having a second wavelength range different from the first wavelength range;
• a wavelength convertor, disposed on an optical path of the first light emitted from the first light source, configured to receive the first light having the first wavelength range from the first light source and to emit third light having a third wavelength range different from the first wavelength range of the first light emitted from the first light source and the second wavelength range of the second light emitted from the second light source;
• a cyclical movement unit configured to cyclically move the wavelength convertor while crossing the optical path of the first light emitted from the first light source, and
• includes a rotatable member disposed on the optical path of the first light emitted from the first light source;
• optical parts configured to define an optical path of the first light emitted from the first light source, and an optical path of the second light from the second light source, and an optical path of the third light emitted from the wavelength convertor;
• a detector configured to detect a cyclic movement condition of the cyclical movement unit;
• a light source control unit configured to reduce light quantity of the first light emitted from the first light source or stop emission of the first light from the first light source when a cyclic movement condition detected by the detector satisfies a specified abnormal condition;
• a drive unit configured to drive rotation of the rotatable member;
• and
• wherein
• the cyclical movement unit is configured to rotate the rotatable member to cyclically move the wavelength convertor disposed on the rotatable member while crossing the optical path of the first light emitted from the first light source, and
• the received light quantity reducing unit is configured to displace the rotatable member outside the optical path of the first light emitted from the first light source when a cyclic movement condition detected by the detector satisfies a specified abnormal condition while outputting the first light having the first wavelength range emitted from the first light source or the light having other wavelength range emitted from the wavelength convertor to the outside the light source device.

A light source device, comprising:

• a first light source configured to emit first light having a first wavelength range;
• a second light source configured to emit second light having a second wavelength range different from the first wavelength range;
• a wavelength convertor, disposed on an optical path of the first light emitted from the first light source, configured to receive the first light having the first wavelength range from the first light source and to emit third light having a third wavelength range different from the first wavelength range of the first light emitted from the first light source and the second wavelength range of the second light emitted from the second light source;
• a cyclical movement unit configured to cyclically move the wavelength convertor while crossing the optical path of the first light emitted from the first light source;
• optical parts configured to define an optical path of the first light emitted from the first light source, and an optical path of the second light from the second light source, and an optical path of the third light emitted from the wavelength convertor,
• the optical parts including an optical path switching unit configured to switch the optical path of the first light emitted from the first light source between a first optical path, in which the first light is received by the wavelength convertor, and a second optical path, in which the first light is output to the outside the light source device without reception by the wavelength convertor;
• a detector configured to detect a cyclic movement condition of the cyclical movement unit;
• a light source control unit configured to reduce light quantity of the first light emitted from the first light source or stop emission of the first light from the first light source when a cyclic movement condition detected by the detector satisfies a specified abnormal condition;
• and
• wherein when a cyclic movement condition detected by the detector satisfies a specified abnormal condition, the received light quantity reducing unit is configured to control the optical path switching unit to maintain the optical path of the first light emitted from the first light source at the second optical path.