High magnification double-side telecentric lens with long work distance

A working distance, telecentric lens technology, used in optical components, optics, instruments, etc., can solve the problems of low telecentricity, low distortion, small numerical aperture, short working distance, etc., and achieve high telecentricity, low distortion, and long working. effect of distance

Pending Publication Date: 2018-06-01
FOSHAN HUAGUO OPTICAL
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, the existing telecentric lenses are mainly low-magnification lenses, and some high-magnification lenses have short working distances, large lens sizes, and small numerical apertures.
The current bi-telecentric lens cannot have better telecentricity and lower distortion under the premise of ensuring long working distance and high magnification

Method used

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  • High magnification double-side telecentric lens with long work distance
  • High magnification double-side telecentric lens with long work distance
  • High magnification double-side telecentric lens with long work distance

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Embodiment Construction

[0025] refer to figure 1 , the present invention provides a long working distance high magnification double-sided telecentric lens, including a diaphragm 100, a front lens group L1 with positive refractive power, and a rear lens group L2 with negative refractive power, the front lens group L1, the diaphragm 100 and the rear lens group L2 are sequentially arranged along the light incident direction, and the rear focus of the front lens group L1 coincides with the front focus of the rear lens group L2.

[0026] In this solution, the rear focus of the front lens group L1 coincides with the front focus of the rear lens group L2 to form a Kepler telescope structure, so that the object-side chief ray and the image-side chief ray are parallel to the optical axis, forming a bi-telecentric light path. In addition, the front lens group L1 with positive refractive power and the rear lens group L2 with negative refractive power are arranged along both sides of the diaphragm 100 to elimin...

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Abstract

The invention discloses a high magnification double-side telecentric lens with a long work distance; the high magnification double-side telecentric lens comprises a diaphragm, a front lens group witha positive focal power, and a rear lens group with a negative focal power; the front lens group, the diaphragm and the rear lens group are arranged in order along the light incident direction; the back focus of the front lens group overlaps with the front focus of the rear lens group. The high magnification double-side telecentric lens can realize the long work distance, a high telecentricity anda low distortion, and can be widely applied to the optical lens field.

Description

technical field [0001] The invention relates to the field of optical devices, in particular to a high-magnification bilateral telecentric lens with long working distance. Background technique [0002] With the advent of the Industry 4.0 era, the machine vision industry is also developing rapidly. Optical lens is the core component of machine vision, and the imaging quality of the lens is very important. Telecentric lenses have superior characteristics different from ordinary lenses: low distortion, constant magnification, etc., so they are widely used in the field of non-contact measurement of machine vision. Specially designed telecentric lenses are often used to avoid perspective distortion of traditional lenses. However, the existing telecentric lenses are mainly low-magnification lenses, and some high-magnification lenses have short working distances, large lens sizes, and small numerical apertures. The current bi-telecentric lens cannot have better telecentricity and ...

Claims

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Application Information

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IPC IPC(8): G02B13/22
CPCG02B13/22
Inventor 刘奋郑忠亮王化东
Owner FOSHAN HUAGUO OPTICAL
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