Patent ID: 11947105
Assignee: FUJIFILM CORPORATION
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 11:
12. A control method by a projection apparatus including an irradiation portion that performs irradiation with light, an irradiation portion that performs irradiation with light, a light modulation element that modulates the light from the irradiation portion, a plurality of reflective portions that reflect an optical image modulated by the light modulation element, a projection optical system that projects the optical image reflected by the plurality of reflective portions to a projection surface, and a processor, the control method comprising:
arranging the plurality of reflective portions between the light modulation element and the projection optical system; and
performing, by the processor, a control of changing a position of a projection range of the optical image by displacing at least one of the plurality of reflective portions,
wherein the processor is configured to perform the control such that an air-equivalent length of a path of the optical image between the light modulation element and the projection optical system has a specific value.