Machine Vision Telecentric Lens
A telecentric imaging 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 laser lens, image-space telecentric lens, and the bi-telecentric lens. Telecentric lens is 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 telecentricity in telecentric lens specs), while in image side is not parallel.
object space telecentric optics with entrance pupil projected to infinity on the image side
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 lens in 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.
The entrance pupil is located where the object-side principal ray passes through the optical axis.
Although object space telecentric lenses can 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 lens specs).
Bi-telecentric lens with the entrance and exit pupils projected to infinity in the image and object spaces respectively
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.
If you want to know more about how to make a telecentric lens, please visit our website.
As a lens manufacturer, we will offer kinds of image space telecentric lens for sale, anything you need, please contact us.
Personne à contacter : Mei Mariel, 86 755 36983709
Bonne affaire : acheter au vendeur
Nous vous invitons à lire nos conditions générales d'utilisations. Vous pouvez aussi vous rendre sur nos FAQ et consulter notre page d'informations sur les risques liés à la contrefaçon.
Cette page concerne les importateurs et exportateurs de Machine Vision Telecentric Lens Rechercher dans la catégorie : Biens d'équipement Rechercher dans la catégorie : telecentric, vision, machine, lens |
Lundi 20 août 2012
Quantité : une machin - Prix : 30000euros
Localisation : Calle Prado Isidro 45 , 28492 Mataelpino Madrid, Personne à contacter : Allami Azizi cherifa, 639509955
autonomo
- 28492 - Mataelpino Madrid
- 639509955
Mercredi 18 décembre 2024
Quantité : 25 tonnes - Prix : A determiner
CUBITAINERS DE GEL DOUCHE + LIQUIDE VAISSELLE + LAVE-LINGE DE TRES GRANDE MARQUE - SOCIETE ATOUT NEGOCE - destockage, valorisation et réemploi des produits. ENTREPOT: 12 - 14 rue Fresnel ZAI PARIWEST 78310 COIGNIERES- MAUREPAS Port: 06.16.59.07.14 Tél: 09.65.31.82.44 Localisation ...
ATOUT NEGOCE
- lechevrel
- 78310 - COIGNIERES
- 06 16 59 07 14
Dimanche 15 décembre 2024
Quantité : 50000 - Prix : dépend du quantité
De grande qualité, agréable au toucher, légère, douce, Ultra-absorbante et sèche vite : Votre Fouta vous suivra partout, dans votre salle de bain, à la piscine, à la plage, sur le transat, le bateau ou en paréo, entourant les bébés, les enfants à la sortie du bain. Dans vos bagages...
artisanat Tunisien
- med.SGHAIER
- 5099 - Tunisia,Monastire
- +21 6 26 10 49 12
- 26104912