Method and device for measuring modulation transfer functions of optic lenses through infinite conjugated light paths

A modulation transfer function, optical lens technology, applied in the direction of testing optical performance, etc., can solve the problem of large lens error, and achieve the effect of meeting the testing requirements, easy to popularize and apply, and convenient for users to operate

Active Publication Date: 2014-10-29
FUZHOU ICAMSYS PHOTOELECTRIC TECH
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Problems solved by technology

[0007] The purpose of the present invention is to overcome above shortcoming, provide a kind of method and the device that are used to realize the modulation transfer function of the optical lens of a kind of infinite conjugate light path measurement, this method and device can be used for measuring

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  • Method and device for measuring modulation transfer functions of optic lenses through infinite conjugated light paths
  • Method and device for measuring modulation transfer functions of optic lenses through infinite conjugated light paths
  • Method and device for measuring modulation transfer functions of optic lenses through infinite conjugated light paths

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[0044] The content of the present invention will be described in detail below with reference to the drawings and specific embodiments of the specification:

[0045] Such as figure 1 Shown is the optical path diagram of the infinite conjugate optical path measuring modulation transfer function method of an optical lens provided by the present invention. The method includes the following steps:

[0046] ①Multiple digital cameras 5 are distributed on the object side of the tested lens 4 according to the measurement requirements of the tested lens 4. The angle between each digital camera 5 and the optical axis of the tested lens 4 is less than or equal to the maximum field of view of the tested lens 4 The optical axis of each digital camera 5 is aligned with the principal point of the object side of the tested lens 4. Each digital camera 5 is preferably set on the optical axis of the tested lens 4 and / or surrounds the optical axis of the tested lens 4 The shafts are evenly distributed ...

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Abstract

The invention relates to a method and a device for measuring modulation transfer functions of optic lenses through infinite conjugated light paths. The method comprises the following steps of, firstly, distributing a plurality of digital cameras on the side of the object space of a lens to be measured according to the measuring requirements of the lens to be measured, and aligning the optical axises of the digital cameras to the principle point of the object space of the lens to be measured; secondly, sequentially placing a reticle, a diffusion plate and a backlight plate on the side of the image space of the lens to be measured from near to far in the axis direction of the lens to be measured; thirdly, adjusting the reticle and enabling the reticle to be positioned on the focal plane of the lens to be measured; fourthly, selecting the image of one resolution cell pattern in the center of every digital camera to compute out the MTF (modulation transfer function) values corresponding to different line pair densities; fifthly, generating the modulation transfer function curves in the meridian direction and the sagittal direction of the lens to be measured in different view positions. The method and the device for measuring the modulation transfer functions of the optic lenses through the infinite conjugated light paths can be applied to measuring lenses with large field angles and solve the problem that measuring the lenses through existing finite conjugated optical systems is large in errors.

Description

technical field [0001] The invention relates to the field of optoelectronics, in particular to a method and device for measuring the modulation transfer function of an optical lens with an infinite conjugate optical path, which can be used to measure wide-angle lenses, fisheye lenses, etc. up to 180°) lens. Background technique [0002] Clarity is the most important indicator of optical lens, and the modulation transfer function curve is a general scientific method to describe the clarity of optical lens. At present, the most common method used by lens manufacturers to obtain the modulation transfer function curve is the back projection visual method. The principle of this method is: the reticle engraved with the discrimination rate pattern is located outside the focal plane of the lens under test and close to the focal plane, and the auxiliary lighting source is evenly irradiated on the reticle. By adjusting the positions of the reticle and the lens under test, the enlarg...

Claims

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Application Information

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IPC IPC(8): G01M11/02
Inventor 孙宏王昆黄志亮高艳林大钦
Owner FUZHOU ICAMSYS PHOTOELECTRIC TECH
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