JP2010262163A5 - - Google Patents

Claims (8)

A refractive optical system including a refractive surface having a first optical axis;
A reflective optical system including a reflective surface having a second optical axis arranged in parallel with the first optical axis;
A reflective member disposed behind the refractive optical system or the reflective optical system and configured to bend the first optical axis or the second optical axis toward the other optical axis;
The first optical system is disposed behind the refractive optical system or the reflective optical system and on the intersection of the bent optical axis and the other optical axis, and directs only the light from the refractive optical system to the rear optical path. And an optical path conversion member capable of selectively taking the second state in which only the light from the reflective optical system is directed to the rear optical path,
The refractive optical system includes a lens using a glass material having a negative temperature dependence coefficient dn / dT of refractive index,
In the reflecting optical system, a zooming telephoto optical system characterized in that a primary mirror and a secondary mirror constituting the reflective surface are connected by a connecting member using a material having a negative linear expansion coefficient. 2. The variable magnification telescope according to claim 1, wherein the coupling member uses a material having a linear expansion coefficient such that a defocus amount due to a temperature change is equal between the reflective optical system and the refractive optical system. Optical system. The zoom lens system according to claim 1 or 2 , wherein the lens using a glass material having a negative temperature dependency coefficient dn / dT of a refractive index is a positive lens. The variable power telephoto optical system according to any one of claims 1 to 3, further comprising a correction lens having a focal position correction function on the image side of the optical path conversion member. 5. The variable magnification telephoto optical system according to claim 4 , wherein the correction lens is a negative meniscus lens. Wherein the image side of the optical path conversion member, a variator lens, zoom telephoto optical system according to any one of claims 1 to 5, characterized in that it comprises a compensator lens. The variable power telephoto system according to any one of claims 1 to 6 , wherein the material having a negative linear expansion coefficient used for the connecting member is manganese nitride having an inverted perovskite structure. . An optical apparatus comprising the variable magnification telephoto optical system according to any one of claims 1 to 7 .