| 摘要 |
An optical system utilizes a variable focus half-lens reflector system for projecting images onto an image plane without the use of folding mirrors. The half lens is arranged with its optical axis parallel to the object and image planes. Attached to the entrance face of the lens is a pair of reflectors arranged to form a right angle which is bisected by the lens optical axis. Principal rays from an object are then reflected from the first mirror, reflected again from the back of the half lens, thus passing twice through the lens and then, via a final reflection from the second attached mirror, onto the image plane.
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