Three-Magnification Double-Telecentric Optical System and Effect of Field on Optical Design

Linghong Liu; Yun Feng; Liuhua Nong; Xuehui Tang

doi:10.3788/LOP202259.0722002

Laser & Optoelectronics Progress, Volume. 59, Issue 7, 0722002(2022)

Three-Magnification Double-Telecentric Optical System and Effect of Field on Optical Design

Linghong Liu¹, Yun Feng^1、*, Liuhua Nong², and Xuehui Tang²

Author Affiliations

¹Research and Development Department, Guilin Measuring & Cutting Tool Co., Ltd., Guilin , Guangxi 541004, China

²Research and Development Department, Guilin URIT Medical Electronic Co., Ltd., Guilin , Guangxi 541004, China

show less

Abstract Get PDF(in Chinese)

Figures & Tables(17)

Fig. 1. Sketch map of double-telecentric system

Download full size

Fig. 2. System initial structural diagram

Download full size

Fig. 3. Outline drawing of optical system

Download full size

Fig. 4. Light path diagram of the three-magnification double-telecentric system

Download full size

Fig. 5. MTF plots. (a)-0.11×; (b)-0.44×; (c)-0.24×

Download full size

Fig. 6. Spot diagrams. (a)-0.11×; (b)-0.44×; (c)-0.24×

Download full size

Fig. 7. System distortion when magnification is -0.11. (a) Field curvature /distortion; (b) grid distortion

Download full size

Fig. 8. System distortion when magnification is -0.44. (a) Field curvature /distortion; (b) grid distortion

Download full size

Fig. 9. System distortion when magnification is -0.24. (a) Field curvature/distortion; (b) grid distortion

Download full size

Table 1. Technical indexes of the telecentric optical system

View table

Table 1. Technical indexes of the telecentric optical system

System parameter	Technical index
Working distance /mm	110
F-number	6
Field of object /mm	100， 25， 25
Magnification	-0.11，-0.24， -0.44
Field of image /mm	11，6， 11
Distortion /%	<0.1
MTF at 145 lp/mm	>0.3
Telecentricity /（°）	<0.1

Table 2. System telecentricity
View table
Table 2. System telecentricity
Magnification Telecentricity /（°）
0H 0.3H 0.5H 0.7H 1H
-0.11× 0.0171 0.0022 0.0125 0.0172 0.0113
-0.24× 0.0038 0.0014 0.0023 0.0029 0.0034
-0.44× 0.0001 0.0017 0.0027 0.0035 0.0042

Table 3. The worst performance when magnification is -0.11

View table

Table 3. The worst performance when magnification is -0.11

Type	Surface	Surface	Value	Criterion	Change
TIRY	11	11	-0.012500000	0.28336434	-0.07062743
TIRX	11	11	0.012500000	0.29291312	-0.06107864
TIRX	11	11	-0.012500000	0.29291312	-0.06107864
TIRY	11	11	0.012500000	0.30447000	-0.04952176
TIRY	12	12	-0.012500000	0.31281091	-0.04118085
TSDY	9	9	0.012500000	0.31467464	-0.03931712

Table 4. MTF and tolerance analysis when magnification is -0.11
View table
Table 4. MTF and tolerance analysis when magnification is -0.11
Ratio >90% >80% >50% >20% >10%
MTF at 135 lp/mm 0.21723603 0.22549033 0.28938280 0.30941017 0.32025872
Max distortion /% 0.098 0.077 0.068 0.042 0.031

Table 5. The worst performance when magnification is -0.44

View table

Table 5. The worst performance when magnification is -0.44

Type	Surface	Surface	Value	Criterion	Change
TIRY	12	12	-0.012500000	0.31327321	-0.02209004
TIRY	12	12	0.012500000	0.31327321	-0.02209004
TIRX	12	12	-0.012500000	0.31327321	-0.02209004
TIRX	12	12	0.012500000	0.31327321	-0.02209004
TEDX	11	12	-0.012500000	0.31896806	-0.01639519
TEDX	11	12	0.012500000	0.31896806	-0.01639519

Table 6. MTF and tolerance analysis when magnification is -0.44
View table
Table 6. MTF and tolerance analysis when magnification is -0.44
Ratio >90% >80% >50% >20% >10%
MTF at 145 lp/mm 0.25229633 0.27286651 0.29586536 0.31513817 0.31844695
Max distortion /% 0.038 0.032 0.028 0.022 0.020

Table 7. The worst performance when magnification is -0.24

View table

Table 7. The worst performance when magnification is -0.24

Type	Surface	Surface	Value	Criterion	Change
TEDX	10	11	-0.02500000	0.34125771	-0.06854529
TEDX	10	11	0.02500000	0.34125771	-0.06854529
TEDY	10	11	-0.02500000	0.34126254	-0.06854047
TEDY	10	11	0.02500000	0.34126254	-0.06854047
TIRX	11	11	-0.02500000	0.35255514	-0.05724787
TIRX	11	11	0.02500000	0.35255514	-0.05724787

Table 8. MTF and tolerance analysis when magnification is -0.24
View table
Table 8. MTF and tolerance analysis when magnification is -0.24
Ratio >90% >80% >50% >20% >10%
MTF at 135 lp/mm 0.23743036 0.26237573 0.31907285 0.35148023 0.36730875
Max distortion /% 0.051 0.043 0.032 0.021 0.011

Tools

Get Citation

Copy Citation Text

Linghong Liu, Yun Feng, Liuhua Nong, Xuehui Tang. Three-Magnification Double-Telecentric Optical System and Effect of Field on Optical Design[J]. Laser & Optoelectronics Progress, 2022, 59(7): 0722002

Download Citation

EndNote(RIS)BibTex Plain Text

Set citation alerts for article

Save article for my favorites