FIELD: optical engineering. SUBSTANCE: optical system has biconcave mirror with a hole at optical axis of the objective, which is mounted in this hole. In case when surfaces of biconcave mirror are made spherical, the correction plates are introduced into the system which are connected rigidly with flat sloped mirrors for rotation about optical axis of the objective. EFFECT: improved reliability. 4 cl, 5 dwg
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SCANNING DEVICE | 1991 |
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Authors
Dates
1995-02-09—Published
1992-02-06—Filed