Light source unit, projection apparatus, projection method and a program medium

A projection method to emit fluorescence light to a display element which displays an image by using the fluorescence light, the method comprising:

• rotating a fluorescent plate including a fluorescence emission region on a surface of a circular substrate;
• and
• generating the fluorescence light by emitting excitation light to the fluorescence emission region,
• wherein
• at a time of the rotating and the generating,
• a display frequency of the display element and a rotation frequency of the fluorescent plate fulfill formula (1)
• j×display frequency=k×rotation frequency (j, k are integers, j>k) (1)

A non-transitory recording medium which stores a program to be executed by a light source unit comprising:

• an excitation light source which emits excitation light;
• a fluorescent plate including a fluorescence emission region on a surface of a circular substrate which emits the fluorescence light to a display element which displays an image by the fluorescence emission region being irradiated with the excitation light from the excitation light source;
• and
• a drive unit which rotates the fluorescent plate in a circumferential direction;
• wherein
• the program makes the drive unit function so that a display frequency of the display element and a rotation frequency of the fluorescent plate fulfill formula (1)
• j×display frequency=k×rotation frequency (j, k are integers, j>k) (1)