| 摘要 |
PURPOSE:To prevent the change of curvature of lenses and stripping-off of an adhesive layer to hold surely a desired lens capactiy by providing a recessed part and a projecting part in the first lens supporting part and the second lens supporting part respectively to constitute plural lenses so that they are cemented freely. CONSTITUTION:The first lens 4 and the second lens 5 are fixed and cemented through an adhesive (adhesive layer)11 interposed between a projecting part 9 and a recessed part 8 so that they cannot be stripped from each other, and a space H is held between an inside part 6c of a supporting part 6b of the first lens 4 and an outside part 7c of a supporting part 7b of the second lens 5 when lenses 4 and 5 are cemented and the deformation of shapes is absorbed by this space H to prevent the deformation of cemented surfaces 6a and 7a even if a cementing pressure in the thrust direction (direction of the optical axis) acts at the cementing time; and even if the temperature or the humidity is changed by the change of use conditions to expand or contract lens body parts 6 and 7 in radial directions, the deformation in the raidal direction is absorbed by a space 10 to prevent an unnatural force form acting upon lens body parts 6 and 7. Consequently, a prescribed lens capacity is always held though the temperature and the humidity are changed. |
