JP2009025463A5 - - Google Patents

Claims (7)

Scanning means for scanning a light beam from a light source;
A first optical system that forms an intermediate image on the light flux from the scanning means;
A light beam component generating means disposed within a specific range including the position of the intermediate image, and generating a plurality of light beam components from the light beam from the first optical system;
A second optical system for condensing the plurality of light beam components toward the surface to be scanned;
An optical scanning device comprising: moving means for moving the light beam component generating means within the specific range.   2. The plurality of light beam components are overlapped at the same position on the scanned surface by moving the light beam component generating means to a position conjugate with the scanned surface by the moving means. Optical scanning device.   3. The optical scanning device according to claim 1, wherein the second optical system includes a reflecting surface having a condensing function.   4. The optical scanning device according to claim 1, wherein the second optical system is a decentered optical system. 5.   5. The optical scanning device according to claim 1, wherein the light beam component generating means is a diffraction element. The second optical system has different vertical magnifications in two directions orthogonal to each other,
The diffraction element has a first diffraction element and a second diffraction element whose diffraction directions are orthogonal to each other,
6. The optical scanning device according to claim 5, wherein the moving unit moves the first and second diffraction elements to different positions in the specific range.   A scanning image display device comprising the optical scanning device according to claim 1, wherein an image is formed on the surface to be scanned.