.

Machine Vision Telecentric Lens

A Telecentric lens is a kind of lens that the chief rays are parallel to the optical axis. There are three kinds of telecentric lens, that is the object-space telecentric lens, image-space telecentric lens, and the bi-telecentric lens. Telecentric lensis always the core business of Canrill Lens. After continuous research and development for 11 years, Canrill has successfully developed 1700+ kinds of lenses, and the number is still increasing, to meet the diverse and growing applications at the best telecentric lens price.

Difference Between Object Space Telecentric Lens And Bi Telecentric Lens

Telecentric lenses have two types of telecentricity: object space and image space telecentricity (referring to the entrance and exit pupil positions, respectively). Therefore, telecentric lenses are divided into: object space telecentric lens, image space telecentric lens, and bi telecentric lens.

Object Space Telecentric Lens

In general, a machine vision telecentric lens refers to an object space telecentric lens. If the entrance pupil of the lens is located at an infinite position in the image side (all objects behind the objective lens), it can be called an object space telecentric lens. The chief ray originated from optical axis is parallel with optical axis in object side ( or to say have very small angle θ which is called telecentricityin telecentric lens specs), while in image side is not parallel.

In the optical design, object space telecentricity is achieved by placing the system's iris diaphragm at the intersection of the front-end groups. Since the entrance pupil is at infinity, the field of view is constant and has no field angle. Since the chief ray (which defines the system's field of view) passes through the optical axis at the aperture stop, when the pupil is at infinity, the ray is parallel to the optical axis and the field of view is zero. By contrast, any entrance pupil within a finite distance of the lens results in a non-parallel fiber.

An object space telecentric lensin which the chief ray is completely parallel to the optical axis in the object space. Note that the field of view does not change no matter where the object plane is, because the chief ray that defines the field of view is perfectly parallel to the optical axis.

Bi Telecentric Lens

Although object space telecentric lenscan provide much higher measurement accuracy than conventional lenses, bi telecentric lenses can also achieve higher accuracy if the lens is object and image space telecentric. The principle of image space and object space telecentricity also applies in bi telecentric lenses. In a bi-telecentric lens, the entrance and exit pupils project to their respective infinity. The chief ray originated from optical axis is parallel with optical axis in both object side and image side ( or to say have very small angle θ which is called telecentricity in telecentric scan lensspecs).

Bi-telecentric lenses are the most accurate type of telecentric lenses because their field of view is completely unaffected by changes caused by changes in object position or sensor position, nor does it operate any cos4θ attenuation. The diagram below shows the comparison of three different lenses: fixed focal length lens, object space telecentric lens, and double-telecentric lens. The X-axis represents the change in working distance (mm) from the nominal value, and the Y-axis represents the dimensional error percentage from the actual value.

As you can see, the bi -telecentric lens is the most accurate lens in the group, with a working distance offset of 4mm and an error of less than 0.2% during this period. Bi-telecentric lenses should be used in applications that require the highest accuracy and precision.

Non Telecentric Lens

The chief ray originated from optical axis has a angle θ with optical axis. For objects at different WD from the lens, the lens will have either smaller or larger mag.



Send product request

To: Shenzhen Canrill Technologies Co., Ltd
Your E-mail:
Message text:


Send to other suppliers

Other supplier products

High Mag 1/2' Sensor Telecentric Long Working Distance Lens
High Mag 1/2' Sensor Telecentric Long Working Distance Lens Standard resolution telecentric lens Wide magnification range from 0.5X to 2X Bi-telecentric design and object telecentric design 22 standard mo...
Telecentric Lens Design Principle and Technical Advantages
Telecentric Lens Design Principle and Technical Advantages Telecentric scan lensis an optical design that the principal ray is in parallel to the optical axis. Because of these characteristics, the main adv...
1.1' (18mm) Sensor Telecentric Lens
1.1' (18mm) Sensor Telecentric Lens Optimized bi-telecentric lens for 1.1' 3.45um cameras High mag and low mag of this series of machine vision telecentric lens are both available ...
The Difference Between a Telecentric Lens and a Normal Lens
The Difference Between a Telecentric Lens and a Normal Lens What Is A Telecentric Lens? The telecentric industrial lens is a lens specially designed to correct the parallax of the traditional industrial len...
DMD Lithography Lens
DMD Lithography Lens DMD Lithography Lens We have been in close cooperation with LDI (Laser Direct Imaging) manufacturers, to research and produce LDI lens. Our dua...
All supplier products

Same products

8.0MP 10-40mm Zoom Lens 1/1.8 F1.4 Format Machine Vision Lenses
8.0MP 10-40mm Zoom Lens 1/1.8" F1.4 Format Machine Vision Lenses Seller: Shenzhen Wikshu Technology Co. Description Manual Zoom 8.0mp C Mount 10-40mm Lens Manual Aperture Machine Vision Lens 1/1...
Microscope Objective Lens
Microscope Objective Lens Seller: Shenzhen Canrill Technologies Co., Ltd Microscope Objective Lens Suitable for ITO, particle detection, wafer inspection Infinity opt...
DMD Lithography Lens
DMD Lithography Lens Seller: Shenzhen Canrill Technologies Co., Ltd DMD Lithography Lens We have been in close cooperation with LDI (Laser Direct Imaging) manufactu...
8k Line Scan (57.4mm) Telecentric Lens
8k Line Scan (57.4mm) Telecentric Lens Seller: Shenzhen Canrill Technologies Co., Ltd 8k Line Scan Lens Suitable for large format Area Scan Camera Line Scan Camera 16Kx3.5μm, 8Kx7...
16k Line Scan (82mm) Telecentric Lens
16k Line Scan (82mm) Telecentric Lens Seller: Shenzhen Canrill Technologies Co., Ltd 16k Line Scan (82mm) Telecentric Lens Specially designed for large image circle up to 82mm in le...