Reflective optical device, and reflective solid-state optical device, and imaging device, multi-wavelength imaging device, video camera device, and vehicle-mounted monitor utilizing the same

A reflective optical device comprising at least three reflection surfaces for bringing light fluxes from an object into focus on an image surface, wherein:

• the reflection surfaces are arranged eccentrically;
• and
• an F value in a plane containing vertices of the respective reflection surfaces is less than 1.9.

A reflective optical device comprising at least three reflection surfaces for bringing light fluxes from an object into focus on an image surface, wherein:

• the reflection surfaces are arranged eccentrically;
• among the reflection surfaces, the reflection surface placed second from the object side in a direction in which the light fluxes travel is given as a second reflection surface, and the second reflection surface is concave in a cross-sectional shape taken in the vicinity of its vertex along a plane containing vertices of the reflection surfaces, and is convex in a cross-sectional shape taken in a direction perpendicular to the plane.

A multi-wavelength imaging device, comprising:

• a reflective optical device that converges light fluxes with only reflection surfaces;
• and
• a detecting means that has sensitivity to light rays in a plurality of different wavelength ranges.

A reflective optical device, comprising a plurality of optical members, each in a shell-like shape, that are opposed to each other and bonded integrally so that a hollow space is formed therein and that have at least one reflection surface on surfaces on hollow space sides.

A reflective solid-state optical device, comprising a solid device body formed with an optical medium having an optical property of preventing at least infrared rays in a specific wavelength range among incident infrared rays from passing therethrough, wherein at least one reflection surface is formed on the device body, the reflection surface being composed of a surface of the device body and a film formed on the surface of the device body.