Small depth-of-field telecentric optical lens with variable working distance

• Main Authors: SHEN DONGHUI, LIU YUNFEI, WU QUANYING, GE DAWEI, CAI DALING
• Format: Patent
• Language: Chinese; English
• Published: 14.08.2020
• Subjects: OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PHYSICS

The invention belongs to the technical field of optical lenses, and particularly relates to a small depth-of-field telecentric optical lens with a variable working distance. The small depth-of-field telecentric optical lens sequentially comprises an object space fixed lens group, an object space movable lens group, an aperture diaphragm and an image space fixed lens group from an object side to animage side along an optical axis. According to the invention, when the working distance is changed, only the object space movable lens group needs to be adjusted to carry out image plane compensationand aberration balance, so that the operation is simple, and the detection efficiency is high; the depth of field is very small, so that it can be ensured that a machine vision measurement system canstably and efficiently obtain the position degree of a connector Pin needle; the imaging performance is good, and a 5000000-pixel-level 1in high-resolution industrial camera can be supported; the telecentric degree is small, t