Image projection apparatus and image projection system having beam deflection section

1. An image projector comprising

a light source for emitting a laser beam, of which the intensity has been modulated in accordance with a modulation signal representing an image to be projected,

a beam deflection section for deflecting the laser beam two-dimensionally such that the image is produced by repeatedly scanning a screen with the laser beam in a predetermined pattern,

a mirror driving section for driving the beam deflection section; and

a control section configured to control the mirror driving section such that the predetermined pattern has a repetitive frequency that is lower than a frame rate of the image.

2. The image projector of claim 1 , wherein the predetermined pattern is a Lissajous pattern.

3. The image projector of claim 2 , wherein the beam deflection section makes the deflection at first and second deflection frequencies f 1 and f 2 around first and second axes of deflection, respectively, and

wherein f 1 :f 2 =n:m (where m and n are relatively prime integers) is satisfied such that the deflected beam draws the Lissajous pattern, and wherein the repetitive frequency fr of the pattern satisfies fr=f 1 /n=f 2 /m.

4. The image projector of claim 3 , wherein the beam deflection section includes a mirror portion that is resonantly driven about two axes and that reflects the laser beam.

5. The image projector of claim 1 , wherein the predetermined pattern is a raster scan pattern.

6. The image projector of claim 4 , wherein the beam deflection section is an MEMS mirror device that has been fabricated on a silicon wafer by a micromachining technology.

7. An image projection system comprising the image projector of claim 1 and a screen that either reflects or transmits the beam projected there.

8. The image projector of claim 5 , wherein the beam deflection section is an MEMS mirror device that has been fabricated on a silicon wafer by a micromachining technology.

9. An image projection system comprising the image projector of claim 2 and a screen that either reflects or transmits the beam projected there.

10. An image projection system comprising the image projector of claim 3 and a screen that either reflects or transmits the beam projected there.

11. An image projection system comprising the image projector of claim 4 and a screen that either reflects or transmits the beam projected there.

12. An image projection system comprising the image projector of claim 5 and a screen that either reflects or transmits the beam projected there.

13. An image projection system comprising the image projector of claim 6 and a screen that either reflects or transmits the beam projected there.