| 摘要 |
<P>PROBLEM TO BE SOLVED: To stabilize the optical characteristics of an optical element. <P>SOLUTION: The holder device can be attached to a pressure bulkhead isolating two spaces having a pressure difference, and can hold a transmissive optical element. The holder device may include a holder section having a first section arranged in the low pressure side space for the optical element out of the two spaces, and a second section arranged in the high pressure side space for the optical element out of the two spaces, and a first sealing member sealing between the second section and the optical element. <P>COPYRIGHT: (C)2013,JPO&INPIT |
