Two-gear focal length switching type infrared lens

• Main Authors: TANG XIUE, ZHANG YANSONG, ZHANG QINGSU, LIU TAO, LYU YEZHOU
• Format: Patent
• Language: Chinese; English
• Published: 30.08.2022
• Subjects: OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PHYSICS

The invention relates to a two-gear focal length switching type infrared lens. An optical system of the lens is composed of a front fixed lens group, a focusing lens group, a gear shifting lens group and a rear fixed lens group which are sequentially arranged along an optical axis; the front fixed lens group is composed of a positive lens A, the focusing lens group is composed of a biconcave lens B and a positive lens C which are arranged in sequence, the gear shifting lens group is composed of a negative lens D, a negative lens E and a positive lens F which are arranged in sequence, and the rear fixed lens group is composed of a positive lens G and a positive lens H; the gear shifting lens group is installed in the lens barrel through the switching lens base, the switching lens base is in running fit with the lens barrel, and the switching lens base rotates by 90 degrees with the switching lens base as the axis to conduct two-gear focal length switching. The lens is compact in structure and moderate in struc