| 摘要 |
A variable magnification mirror having a thin diaphragm provided with a reflective front surface includes a mechanism for deforming the diaphragm from a flat shape, yielding unity magnification of images formed by the reflective surface, to adjustably greater curvatures yielding adjustably larger magnification factors. The mechanism includes a screw-driven, flexible circular puller plate fastened to a rear central portion of the rear surface of the reflective diaphragm, the outer peripheral edge of the diaphragm being held axially fixed with respect to the screw. In the preferred embodiment, the puller plate is so constructed as to have greater flexibility at outer radial portions thereof to accommodate larger angular defections of the outer radial portions of the diaphragm, thereby aiding in maintenance of substantially spherical, distortion free contour. The increased flexibility of outer radial portions of the puller plate is preferably effected by a radial taper provided in the puller plate cross section, the outer radial portions of the plate being progressively thinner than the central radial portion of the puller plate. Preferably, the puller plate is fastened to the rear surface of the reflective diaphragm by means of a resilient adhesive member, the elastic deformability of the member further aiding in maintenance of a substantially spherical diaphragm contour.
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