Composite optical device
A composite optical device 1 includes a first optical section 10 having an optical functional surface 11 and a second optical section 20 bonded to the first optical section 10 on the optical functional surface 11 . The optical functional surface 11 includes a smooth part 13 and a concave-convex part 12 adjacent to each other, and is constructed so that a position P 2 , along a normal direction of the smooth part 13 , of a concave bottom of the concave-convex part 12 can be closer to the center of the first optical section 10 than a position P 1 along the normal direction of an end of the smooth part 13 on a side of the concave-convex part 12 in a boundary vicinity portion NR between the smooth part 13 and the concave-convex part 12.
1. A composite optical device comprising:
a first optical section having an optical functional surface; and
a second optical section bonded to said first optical section on said optical functional surface,
wherein said optical functional surface includes a smooth part and a concave-convex part adjacent to each other, and
said optical functional surface is constructed in such a manner that a position, along a normal direction of said smooth part, of a concave bottom of said concave-convex part is closer to a center of said first optical section than a position along the normal direction of an end of said smooth part on a side of said concave-convex part in the vicinity of a boundary between said smooth part and said concave-convex part.
2. The composite optical device of claim 1 ,
wherein said first optical section is obtained by press molding.
3. The composite optical device of claim 1 ,
wherein said second optical section is a lens in which a surface bonded to said first optical section is one lens surface and another lens surface opposing said one lens surface is formed as a smooth surface.
4. The composite optical device of claim 1 ,
wherein each of said first optical section and said second optical section is substantially made of glass or a resin.
5. The composite optical device of claim 1 ,
wherein said concave-convex part is a diffraction surface, a lens array surface including a plurality of convex or concave lens surfaces, a phase step surface or an antireflection surface having an antireflection structure.
6. The composite optical device of claim 1 ,
wherein said optical functional surface is constructed in such a manner that a distance along the normal direction between a concave bottom and a convex apex of said concave-convex part is not less than ⅕ times as large as a distance between the end of said smooth part on the side of said concave-convex part and said concave bottom in the vicinity of the boundary.
7. A composite optical device comprising:
a first optical section having an optical functional surface; and
a second optical section bonded to said first optical section on said optical functional surface,
wherein said optical functional surface includes a smooth part and a concave-convex part adjacent to each other, and
said optical functional surface is constructed in such a manner that a position, along a normal direction of said smooth part, of a convex apex of said smooth part is farther from a center of said first optical section than a position along the normal direction of an end of said smooth part on a side of said concave-convex part in the vicinity of a boundary between said smooth part and said concave-convex part.
8. The composite optical device of claim 7 ,
wherein said second optical section is pressingly bonded to said first optical section.
9. The composite optical device of claim 7 ,
wherein each of said first optical section and said second optical section is substantially made of glass or a resin.
10. The composite optical device of claim 7 ,
wherein said concave-convex part is a diffraction surface, a lens array surface including a plurality of convex or concave lens surfaces, a phase step surface or an antireflection surface having an antireflection structure.
11. The composite optical device of claim 7 ,
wherein said optical functional surface is constructed in such a manner that a distance along the normal direction between a concave bottom and a convex apex of said concave-convex part is not more than five times as large as a distance between the end of said smooth part on the side of said concave-convex part and said convex apex in the vicinity of the boundary.