| 摘要 |
An all-reflective optical system (20) includes an all-reflective afocal module (22) having a first optical end (24) of the afocal module (22) and a second optical end (26) of the afocal module (22), wherein the afocal module (22) has a non-unity magnification between the first optical end (24) and the second optical end (26), and an all-reflective imaging module (28) having an input optical end (30) and an output optical end (32). An all-reflective switching structure (60, 70) is operable to direct a light beam (38) through the afocal module (22) and the imaging module (28). A first position of the switching structure (60, 70) directs the light beam (38) to enter the first optical end (24) of the afocal module (22) and exit the second optical end (26) of the afocal module (22), and thereafter to enter the input optical end (30) of the imaging module (28) and to exit the output optical end (32) of the imaging module (28). A second position of the switching structure (60, 70) directs the light beam (38) to enter the second optical end (26) of the afocal module (22) and to exit the first optical end (24) of the afocal module (22), and thereafter to enter the input optical end (30) of the imaging module (28) and to exit the output optical end (32) of the imaging module (28). A third position of the switching structure (60, 70) directs the light beam (38) to enter the input optical end (30) of the imaging module (28) and to exit the output optical end (32) of the imaging module (28), so that the light beam (38) completely bypasses the afocal module (22).
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