Bonded optical element
In a bonded optical element, a second optical element is bonded to a first optical element by forming the second optical element by heating and pressing against the first optical element a second optical element material. The first optical element is a concave lens. A bonded face of an intermediate portion between a lens portion and an edge portion of the first optical element is substantially in an R shape in section.
1. A bonded optical element comprising a first optical element and a second optical element bonded to each other by forming the second optical element by heating and pressing against the first optical element a second optical element material, wherein
a lens face part of a bonded face of the first optical element is concave, and
a bonded face of an intermediate portion between a lens portion and an edge portion of the first optical element includes a curvature.
2. The bonded optical element of claim 1 , further comprising:
a third optical element bonded to the first or second optical element.
3. The bonded optical element of claim 1 , wherein the optical elements are made of glass materials.
4. The bonded optical element of claim 1 , wherein
at least one of the optical elements is centered after the optical elements are bonded to each other.
5. The bonded optical element of claim 1 , wherein
the lens face parts of the bonded faces of the optical elements are aspheric.
6. The bonded optical element of claim 1 , wherein
the curvature has a radius of approximately 0.5 mm.
7. A bonded optical element comprising a first optical element and a second optical element bonded to each other by forming the second optical element by heating and pressing against the first optical element a second optical element material, wherein the second optical element is larger in diameter than the first optical element, and
part of an outer peripheral face which is part of a bonded face of the first optical element has a curvature.
8. The bonded optical element of claim 7 , further comprising:
a third optical element bonded to the first or second optical element.
9. The bonded optical element of claim 7 , wherein the optical elements are made of glass materials.
10. The bonded optical element of claim 7 , wherein
at least one of the optical elements is centered after the optical elements are bonded to each other.
11. The bonded optical element of claim 7 , wherein the lens face parts of the bonded faces of the optical elements are aspheric.
12. The bonded optical element of claim 7 , wherein the curvature has a radius of approximately 0.5 mm.