Infrared imaging lens
AssigneeNippon Electric Glass Co., Ltd.
InventorsYoshimasa MATSUSHITA, Fumio SATO, Nobuo HORI
Life of this patent
Estimating the term…
Abstract
Provided is a telephoto lens which is excellent in resolution. An infrared imaging lens (1) includes a first lens (L1), a second lens (L2), and a third lens (L3) each of which is made of chalcogenide glass having a refractive index of 2.5 to 4.0 measured at a wavelength of 10 μm, the infrared imaging lens (1) having a total system focal length not less than two times larger than a diameter of an image circle of the infrared imaging lens (1).
Claims15
An infrared imaging lens used in an infrared region including at least a wavelength in a range of 7 μm to 14 μm, the infrared imaging lens comprising a first lens, a second lens, and a third lens that are disposed in this order from an object side to an image plane side, each of the first lens, the second lens, and the third lens being made of chalcogenide glass having a refractive index of 2.5 to 4.0 measured at a wavelength of 10 μm, the infrared imaging lens having a total system focal length fL not less than two times larger than a diameter of an image circle of the infrared imaging lens.
An infrared imaging lens used in an infrared region including at least a wavelength in a range of 7 μm to 14 μm, the infrared imaging lens comprising a first lens, a second lens, and a third lens that are disposed in this order from an object side to an image plane side, each of the first lens, the second lens, and the third lens being made of chalcogenide glass having a refractive index of 2.5 to 4.0 measured at a wavelength of 10 μm, the infrared imaging lens having a half angle of view of not more than 14°.
Dependencies are inferred from the claim text.