- #1
tappo
- 2
- 0
Hello everyone,
I am a software engineer and know very little about lenses but am trying to learn. I am confused about the differences between convex-convex and plano-convex and how to decide how to design an actual plastic lens for a real world application.
Here is an example (not real world, but bar codes seem easy to understand since 1D):
Lets say I want to make something like a bar code scanner for simple bar codes. The bar code is 40mm wide. And I have a 1D camera sensor, which is only 10mm wide. And then let's say the sensor is 10mm away from the bar code. So somehow I need to scale the bigger barcode to the smaller area of the sensor.
Here are some questions:
1) Since everything is 1D, it seems like a cylindrical lens should/could be used, is that true?
2) What kind of lens should be used? (plano-convex or convex-convex, or something else?), this part is very unclear to me.
3) How can I compute the curvature of the lens to get the desired distance between sensor and bar code?
Many thanks for any hints and ideas,
Tappo
I am a software engineer and know very little about lenses but am trying to learn. I am confused about the differences between convex-convex and plano-convex and how to decide how to design an actual plastic lens for a real world application.
Here is an example (not real world, but bar codes seem easy to understand since 1D):
Lets say I want to make something like a bar code scanner for simple bar codes. The bar code is 40mm wide. And I have a 1D camera sensor, which is only 10mm wide. And then let's say the sensor is 10mm away from the bar code. So somehow I need to scale the bigger barcode to the smaller area of the sensor.
Here are some questions:
1) Since everything is 1D, it seems like a cylindrical lens should/could be used, is that true?
2) What kind of lens should be used? (plano-convex or convex-convex, or something else?), this part is very unclear to me.
3) How can I compute the curvature of the lens to get the desired distance between sensor and bar code?
Many thanks for any hints and ideas,
Tappo