| 摘要 |
PROBLEM TO BE SOLVED: To eliminate discomfort caused by glare during separating a hologram plate. SOLUTION: Only a laser beam source 21 for generating a diffused laser beam is provided in a lens barrel 20. A condensing lens 22 which converts the diffused laser beam into a parallel laser beam and a hologram plate 23, are provided in a lens barrel 24 which fits into the lens barrel 20 as an integral unit formed by, for example, heat caulking. After the space between the lens barrel 20 and the lend barrel 24 is adjusted, these lens barrels 20 and 24 are fixed by an adhesive. When the laser beam source 21 is driven in this state, the generated diffused laser beam is converted into the parallel laser beam by the condensing lens 22, and then a hologram reproduced image (not shown) in formed by irradiating the hologram plate 23 with the parallel laser beam. The hologram reproduced image is projected towards the object. |
