| 摘要 |
PROBLEM TO BE SOLVED: To provide an upright variable power afocal optical system which uses a variable focal distance element, that is less in optical performance deterioration due to change with time, and is simple in a configuration and a mechanism. SOLUTION: The upright variable power afocal optical system includes a first lens group G1 having the variable focal distance element L1V and a second lens group G2 having a fixed focal distance element L2. The variable focal distance element L1V changes a focal distance by sealing a first liquid material and a second liquid material, which is different from the first liquid material in a refractive index and unmixable with the first liquid material, into a container, by changing physical quantities applied to the first and second liquid materials, thereby changing the shape of the boundary face of the first and second liquid materials. COPYRIGHT: (C)2007,JPO&INPIT
|
