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Home > How To > What's the lens?
What's the lens?

What's the lens?

By  Niccolo Lepage 2020-01-07 1596 386

The main function of the lens is to collect the reflected light of the illuminated object and focus it on the CCD, the image projected on the CCD is inverted, and the camera circuit has the function of inverting it, and its imaging principle is the same as that of the human eye.

Classification of lenses

According to the origin classification of lenses, mainly Japanese lenses and German lenses. The Japanese lens mainly has a better color reduction, while the German lens has a strong sense of hierarchy. At present, the Chinese lens in the market is also gradually occupying a certain market, mainly because the price is relatively low.

According to the performance and shape of the lens, there are P-type, E-type, L-type and automatic zoom lens and other types:

1. P lens

(1) the pupil focus of the automatic positioning lens has been adjusted. It is necessary to check whether the definition from the maximum magnification to the minimum magnification is consistent and clear.

(2) check the coaxiality, that is, the maximum magnification to the minimum magnification is taken in the same position, can not be offset or offset too large, are regarded as defective products, and the lens must be replaced.

(3) the optical magnification is 0.7Mi 4.5X, that is, there are nine kinds of magnification between 0.7 and 4.5 times.

(4) the sharpness is judged according to the correction block and the imaging reflection of the actual object.


2.E lens

(1) this lens is an ordinary industrial lens and needs to adjust the pupil focus manually. After the machine is installed, when the maximum magnification and the minimum magnification are manually adjusted, the image is equally clear. If the definition can not be adjusted as a defective product, if there are unstable factors such as shaking of the lens after adjustment, it is also regarded as a defective product.

(2) check the coaxiality, that is, the maximum magnification to the minimum magnification is taken in the same position, can not be offset or offset too large, are regarded as defective products, and the lens must be replaced.

(3) the optical magnification is 0.7Mi 4.5X.

(4) the sharpness is interpreted according to the correction block and the imaging reflection of the actual object.


3.L lens

(1) this lens is an ordinary industrial lens and needs to adjust the pupil focus manually. After the machine is installed, the image is equally clear when the maximum magnification and the minimum magnification are manually adjusted. If the definition can not be adjusted, it is regarded as a defective product, and if there are unstable factors such as shaking of the lens after adjustment, it is also regarded as a defective product.

(2) check the coaxiality, that is, the maximum magnification to the minimum magnification is taken in the same position, can not be offset or offset too large, are regarded as defective products, and the lens must be replaced.

(3) the optical magnification is 0.7Mi 4.5X.

(4) the sharpness is interpreted according to the correction block and the imaging reflection of the actual object.


4. Automatic zoom lens

(1) in order to adjust the pupil focus of the automatic positioning lens itself, it is necessary to check whether the definition from the maximum magnification to the minimum magnification is consistent and clear.

(2) check the coaxiality, that is, the maximum magnification to the minimum magnification is taken in the same position, can not be offset or offset too large, are regarded as defective products, and the lens must be replaced.

(3) the optical magnification is 0.7Mi 4.5X.

(4) the sharpness is interpreted according to the correction block and the imaging reflection of the actual object.

The classification of lenses can be classified according to focal length, aperture and telescopic adjustment.

(1) according to focal length, there are fixed focal length type, telescopic type, automatic aperture or manual aperture and so on.

(2) according to the focal length number, there are standard lenses, wide-angle lenses, telescopic lenses and other types.

(3) according to the aperture classification, there are fixed aperture type (fixed iris), manual aperture type (manual iris), automatic aperture type (auto iris) and so on.

(4) according to the lens telescopic adjustment mode, there are electric telescopic lenses, manual telescopic lenses and other types.

Lens quality

(1) using the number of lenses: the combination of multiple types of lenses can reduce color deviation, improve focus and other problems, but reduce light transmittance.

(2) Lens transmittance: good lenses have good transmittance and high price, while poor lenses will block the passage of light.

(3) coating and grinding: lens coating and grinding technology affects the quality of lenses.

(4) Mechanical device: the precision of the internal mechanical structure of the lens affects the precise plating and reliability of lens movement, poor quality mechanical structure will produce adjustment errors and inconsistencies.


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