| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical apparatus that can cope with an unnecessary light in a simple constitution even in a constitution enabling improvement in photocoupling efficiency to an image formation optical system of a light-emitting element array combined with the image formation optical system. SOLUTION: A transparent substrate 6 where an LED lens array 5 narrowing a radiation angle of light-emitting elements 3 is formed is not provided with an internal structure shielding light between lenses 7, but has a non-effective front face 6a except the lens part 7 and a side face 6b covered with a light- shielding film of a reflecting film 9 (or absorbing film). Unnecessary background lights P2 , P3 , P4 emitted outside from the transparent substrate 6 are surely restricted. |
