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Industrial lenses are mechanical An important component of the visual acquisition system, the telecentric lens in the lens is currently widely used in machine vision applications due to its unique performance.
The telecentric lens is a high-end machine vision lens. Its purpose is to eliminate the problem of different magnification ratios caused by the different distances of the measured object (or CCD chip) from the lens. At present, telecentric lenses are mainly divided into three categories: object-side telecentric lenses, image-side telecentric lenses and bilateral telecentric lenses.
The goal of telecentric lens design is to eliminate the The distance between the measured object (or CCD chip) and the lens is different, resulting in different magnification ratios. According to the design principle of telecentric lens classification, the distance is:
01
Object telecentric optical path:
The object-side telecentric optical path is to place the aperture diaphragm on the image-side focal Rwandans Sugardaddy solid, and the object-side principal ray is parallel to The center of concentration of the principal ray of the optical axis is located at infinity on the image side, which is called the object-side telecentric optical path. Its function is to eliminate reading errors caused by incorrect focusing on the object-side.
02
like Telecentric optical path:
The telecentric optical path of the image is to place the aperture diaphragm on the object-space focal plane of the optical system. The main ray of the image-side is parallel to the optical axis. The center of the collection of the principal ray is located at infinity in the object-space. This is called : Image telecentric optical path. Its function is to eliminate the measurement error caused by inaccurate focusing of the image side.
03
Telecentric light path on both sides:
Combines the dual effects of object-side/image-side telecentricity . Mainly used in the field of visual measurement and detection
WHRW Escorts Under what circumstances should a telecentric lens be used?
From the principle of telecentric lens design, it can be seen that the telecentric lens is full of Rwanda Sugar Daddy is a high-precision lens designed to take full advantage of optical imaging characteristics and fully consider the influence of light in imaging. Let us take a look at the circumstances under which telecentric lenses should be used: p> 1. When the thickness of the object to be detected is large and more than one dimension needs to be detected, typical applications include food boxes, beverage bottles, etc.
2. When the position of the object to be detected is not determined, it may be different from the camera. At a certain angle.
3. When the measured object jumps up and down during the detection process, such as the vertical vibration of the child line, which causes the working distance to change.
4. https://rwanda-sugar.com/”>Rwanda Sugar When measuring objects with apertures or three-dimensional planar objects.
5. When low distortion rate is required and the brightness of the image results is almost completely consistent .
6. When the defects that need to be detected can only be detected under RW Escorts parallel lighting. p> 7. When the requirement exceeds the detection accuracy, if the allowable error is 1um
With the development of machine vision. , Telecentric lenses have been widely used in the fields of mechanical vision precision measurement and high-precision inspection such as mechanical parts measurement, plastic parts measurement, glass products and medical parts measurement, and electronic component measurement.
Responsible editor: xj Original title: Principles and application scope of telecentric lenses
Article source: [WeChat public account: Superman Halcon Machine Vision] Please indicate the source when transcribing and publishing the article. >
Original title: Principle and Application Scope of Telecentric Lens
Article Source: [Microelectronic Signal: chaorenshijue, WeChat Official Account: Superman Halcon Mechanical Vision] Welcome to add tracking and follow the article transcription! Please indicate the source when publishing.
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