Birch, Stewart, Kolasch & Birch, LLP
Infrared optical system for infrared cameras
An infrared optical system for infrared cameras has a convex lens held by a holding member composed of a low-dispersion material that transmits infrared light. A stop for restricting light beams entering the convex lens is disposed on an object side from the convex lens. An aberration correcting plate for reducing spherical aberration is provided in the vicinity of the stop. A field flattener, the thickness of which changes along image height to offset curvature of field, is disposed on an image side of the convex lens.
Mitsubishi Denki Kabushiki Kaisha
H G G
H04N G02B G02B
additional inventional inventional
Yasuhisa Takayuki
Tamagawa Nakano