SELF-TEMPERATURE FOCUS COMPENSATION DEVICE

To provide a self-temperature focus compensation device which is adapted to cooperate with a lens group and includes at least one Fresnel lens group.SOLUTION: Each Fresnel lens group has zero focal power at a specific temperature and is a cemented lens. Each Fresnel lens group includes a first Fresn...

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Bibliographic Details
Main Author HUANG SHI-HWA
Format Patent
LanguageEnglish
Japanese
Published 07.10.2021
Subjects
OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
OPTICS
PHYSICS
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Summary:To provide a self-temperature focus compensation device which is adapted to cooperate with a lens group and includes at least one Fresnel lens group.SOLUTION: Each Fresnel lens group has zero focal power at a specific temperature and is a cemented lens. Each Fresnel lens group includes a first Fresnel lens and a second Fresnel lens. The first Fresnel lens has positive focal power. The second Fresnel lens has negative focal power. A sum of a change in focal power of at least one Fresnel lens group due to a temperature change and a change in focal power of the lens group due to the temperature change is zero or close to zero in a certain temperature range.SELECTED DRAWING: Figure 1 【課題】レンズ群と協働するように適合され、少なくとも１つのフレネルレンズ群を備える、自己温度焦点補償装置を提供する。【解決手段】各フレネルレンズ群は、特定の温度において合焦力がゼロであリ、接合レンズである。各フレネルレンズ群は、第１のフレネルレンズ及び第２のフレネルレンズを備える。第１のフレネルレンズは正の合焦力を有する。第２のフレネルレンズは負の合焦力を有する。ある温度範囲において、温度変化による少なくとも１つのフレネルレンズ群の合焦力変化と、その温度変化によるレンズ群の合焦力変化との和は、ゼロに近い。【選択図】図１
Bibliography:Application Number: JP20210049787