In many categories of optical lenses, telecentric lenses have always been a special kind of product. Many people with distant objects, such as Fang Yuanxin and Bicentricity, will mix them and find out the relationship between them. Features, this article Telecentric Optics (BTOS) Xiao Bian will simply help you explain the differences and characteristics of these three products.
First explain what is telecentricity. Telecentricity is a description of the optical imaging characteristics of a lens. A lens consists of an optical system. The front and back sides of the optical system correspond to the object and the imaging chip, respectively, and the light path is reversible. These two sides can be interchanged under certain conditions. In the optical definition, the side where the light enters the optical system is called the object of the optical system, and the side where the light is refracted through the optical system is called the image side.
Double telecentric light path (BTOS BT-2336 light path diagram)
When the entrance pupil is located close to the infinity from the optical system, the optical system is the telecentricity of the object; when the exit pupil is located near the infinity from the optical system, the optical system is like the square telecentricity; when the entrance pupil and the exit pupil are respectively located When the optical system is at an infinity, the Guangxu system is the bilateral telecentricity of the object image.
We know that when the entrance pupil is located at an infinite distance from the optical system, the sum of each luminous point on the object surface entering the imaging system is a contour similar to a three-dimensional cone, the rotational symmetry plane of this cone and the meridional axis of the optical system. Face parallel. Because light has such an imaging principle, the telecentric optical imaging system does not have a field of view factor. This ensures that the lens is within the depth of field. Even if the change distance has the same optical magnification, it requires precision. The visual application of calibrated object-proportional relationship provides the most accurate guarantee of the principle. This is one of the reasons why more and more precision-minimizing projects in the machine vision industry are using telecentric or double telecentric lenses.
In addition, because the optical system has such a light confinement relationship for each luminous point, the illumination per unit area within the visual field of the optical system imaging system is very uniform, which ensures that the entire image plane is uniform in the illumination environment. brightness.
The advantage of the telecentric and dual telecentric cores is that the object has a fixed imaging magnification.
The advantage of Fang Yuanxin's and Bi-distance's core lies in the uniform illumination of the image side.
The optical effective diameter of the telecentric side is generally close to the effective diameter of the object or image, because the effective aperture of the lens directly determines the overall size and processing cost of the entire lens, so in product development, generally corresponds to 2/3 of the target surface, 1 The optical lens with a magnification of more than or equal to the magnification ratio has great advantages in terms of volume and cost after the telecentricity of the object. On the contrary, an optical lens with a magnification of 1 times or less does not have the volume and cost after being made telecentric. obvious advantage.
This is also the reason that the general telecentric telecentric lens optical magnification on the market is more than 1 times or more than the product, and the double telecentricity is generally more than 1 times the following products.
For precision imaging, the constant proportional relationship of the object is determined by the telecentricity of the object, and the uniform illumination of the image surface is determined by the telecentricity of the object.
For the application of machine vision, the most common use of telecentric lenses is to solve the core problem of constant image ratio. In addition, the advantages of the telecentric optical system of the object are small distortion, large depth of field, and high resolution. The basis of choice for machine vision applications.
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