Patent ID: 8960919
Filing Date: 2015-02-24
Classification: G03B,H04N

Abstract:
1. An image projection device, comprising: a laser light source section that outputs laser light; a laser scanning section that deflects the laser light that is output from said laser light source section and scans the laser light; a projection target section to which said laser scanning section projects the scanned laser light; a light detection section that detects light radiated from said projection target section; and a control section that controls said laser light source section, wherein said projection target section is composed of light radiation members that radiate light that said light detection section can detect when the scanned laser light is projected to said light radiation members, said light radiation members being regularly arranged; and non-light radiation members that do not radiate light that said light detection section can detect when the scanned laser light is projected to said non-light radiation members, wherein said control section includes: a laser output switch signal generation section that generates a switch signal that switches between an ON state and an OFF state of laser light that is output from said laser light source section based on a detection result of said light detection section; and a laser light source modulation signal generation section that generates a modulation signal of said laser light source based on the switch signal generated by said laser output switch signal generation section and an image signal that is input from the outside of said image projection device, and wherein said laser output switch signal generation section includes: a number-of-times measurement section that measures the number of passage times that the scanned laser light has passed through said light radiation members based on the detection result of said light detection section; a time measurement section that is triggered to measure an elapsed time when said number-of-times measurement section measures the number of passage times; an arithmetic section that calculates an initial timing at which said laser light source section starts outputting the laser light based on the measurement results of said number-of-times measurement section and said time measurement section; and a signal generation section that generates said switch signal at the initial timing calculated by said arithmetic section.