Objective lens unit and optical pickup device
AssigneeKonica Minolta Opto, Inc.
InventorsTeruhiko Itoh, Akira Sawagami
Life of this patent
Estimating the term…
Abstract
An objective lens unit for an optical pickup device which is composed of a first optical element including a first element body positioned on an optical information recording medium side and a first annular portion formed on the outer periphery of the first element body, and further composed of a second optical element including a second element body and a second annular light source side of the first element body and a second annular portion formed on the outer periphery of the second element body and coupled to the first annular portion, and at least one of the first and second annular portion has a portion in which the size of outer shape is smaller than the vicinity on at least a part of the light source side.
Claims20
An objective lens unit for an optical pickup device comprising:
- a first optical element including:
- a first element body positioned on an optical information recording medium side;
- and
- a first annular portion formed on an outer periphery of the first element body;
- and further comprising:
- a second optical element including:
- a second element body positioned on an light source side of the first element body;
- and
- a second annular portion formed on an outer periphery of the second element body and coupled to the first annular portion.
- wherein at least one of the first annular portion and the second annular portion has a portion in which a size of outer shape is smaller than vicinity on at least a part of a light source side of an outer periphery.
Dependencies are inferred from the claim text.