1. Haosheng Hu College of Optical Sciences University of Arizona
OPTI-521 Optomechanical Engineering Tutorial of Telecentric Lens Dec
Haosheng Hu
College of Optical Sciences
University of Arizona
Tutorial of Telecentric Lens

2. Tutorial of Telecentric Lens
Overview
(1) Concept of Telecentric Lens
(2) Object-space Telecentric Lens
(3) Image-space Telecentric Lens
(4) Double Telecentric Lens
(5) Advantages of Telecentric Lens
(6) Recent Product of Telecentric Lens
Tutorial of Telecentric Lens

3. Concept of Telecentric Lens
The definition of telecentric lens is that a compound lens with entrance pupil or exit pupil at infinity distance, which can provide orthographic view of the subject. Because of the infinity entrance pupil or exit pupil, chief ray, which pass through the center of aperture stop will parallel to the optical axis in front of or behind the optical system. Commonly, there are two kinds of telecentric, one is objective-space telecentric, another one is image-space telecentric.
Tutorial of Telecentric Lens

4. (1) Object-space Telecentric Lens
Concept of Object-space Telecentric Lens
Object-space Telecentric Lens
Tutorial of Telecentric Lens

5. Tutorial of Telecentric Lens
Object Displacement in Object-space Telecentric System
Image Measurement in Object-space Telecentric System
Tutorial of Telecentric Lens

6. Tutorial of Telecentric Lens
Finite Conjugates of Object-space Telecentric System
Tutorial of Telecentric Lens

7. (2) Image-space Telecentric Lens
Concept of Image-space Telecentric Lens
Image-space Telecentric Lens
Tutorial of Telecentric Lens

8. Tutorial of Telecentric Lens
F-number Calculation for Image-space Telecentric Lens
Note: f/#w ≈ (1-m) f/# can not use in here, since DEP is not equal to DXP
Tutorial of Telecentric Lens

9. (3) Double Telecentric Lens
Concept of Double Telecentric Lens
Tutorial of Telecentric Lens

10. Tutorial of Telecentric Lens
(3) Advantages of Telecentric Lens
a) Zero Angle Field of View to Minimize the Paraxial Error
Tutorial of Telecentric Lens

11. Tutorial of Telecentric Lens
(3) Advantages of Telecentric Lens
a) Zero Angle Field of View to Minimize the Paraxial Error
Tutorial of Telecentric Lens

12. Tutorial of Telecentric Lens
(3) Advantages of Telecentric Lens
b) Telecentric Lens Has Large Depth of Field
Tutorial of Telecentric Lens

13. Tutorial of Telecentric Lens
(3) Advantages of Telecentric Lens
c) Telecentric Lens Has Less Distortion
Tutorial of Telecentric Lens

14. Tutorial of Telecentric Lens
(4) Recent Product of Telecentric Lens
0.050X, 1/1.8” C-Mount TitanTLTM Telecentirc Lens
Tutorial of Telecentric Lens

15. Tutorial of Telecentric Lens
(4) Recent Product of Telecentric Lens
0.050X, 1/1.8” C-Mount TitanTLTM Telecentirc Lens’ Specification
Tutorial of Telecentric Lens

16. Tutorial of Telecentric Lens
(4) Recent Product of Telecentric Lens
0.050X, 1/1.8” C-Mount TitanTLTM Telecentirc Lens’ Performances
Tutorial of Telecentric Lens

17. Tutorial of Telecentric Lens
Conclusions:
In this tutorial, I introduced and described what is telecentric lens, and presented the concepts of object-space telecentric system, image-space telecentric system and double telecentric system. Also, I enumerated three advantages of telecentric lens, which are smaller paraxial error, larger depth of field and smaller distortion than conventional lens. At last, I list a recent advanced telecentric lens in Edmund Optics with drawing and performances, this telecentric lens is 0.050X, 1/1.8” C-Mount TitanTLTM Telecentirc Lens.
Tutorial of Telecentric Lens

18. Tutorial of Telecentric Lens
References:
1. “Section 15 Telecentric System”, John Greivenkamp, OPTI-502 Optical Design and Instrumentation I Class Note.
2. “The Advantages of Telecentric Lens”, Edmund Optics Website,
3. “0.050X, 1/1.8” C-Mount TitanTLTM Telecentirc Lens”, Edmund Optics Website,
4. “Telecentric Lens”, Wikipedia,
Tutorial of Telecentric Lens