| 摘要 |
PURPOSE:To easily produce and assemble plastic lenses without remarkably losing lens functions due to the change of temperature and humidity by forming at least two connection passages along the optical axis of the plastic lenses on the flange parts of the lenses. CONSTITUTION:Two connection passages 10 parallel with the optical axis of the plastic lenses are penetrated into respective flanges 2a-4a of the plastic lenses 2-4 and a connection rod 11 having a large diameter head part 11a is inserted into each of the connection passages 10. Respective lenses 2-4 are pressed into contact with each other and held by the spring force of a spring 12. When the lenses 2-4 are expanded by temperature, the spring 12 is depressed by the displacement of the lenses 2-4 due to the expansion and stress is generated on respective surfaces of the lenses 2-4, so that the lens functions can be prevented from being lossed. When the lenses 2-4 are contracted by temperature, displacement due to the contraction of the lenses 2-4 is absorbed by the spring force of the spring 12. In addition, expansion/ contraction due to humidity change can be similarly absorbed.
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