Skip to content

/SLAcer.js

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

issue related to Fresnel Lens & LCD display #14

Closed
vikrant8051 opened this issue Aug 22, 2017 · 1 comment

Comments

@vikrant8051
Copy link

commented Aug 22, 2017 •
edited

I am also designing SLA printer based on 2K LCD. Could you please tell me, what is focal length for your Fresnel Lens & from where you have purchased it ?

When I keep the LCD on the top of 100 W LED, due to polarizer reflection most of the UV light gets blocked/reflected and hence I am unable to get good intensity on top of the LCD. How can we overcome this issue ?

Will a Fresnel Lens with 10 cm focal length be able diffuse the light so that we get equal intensity on each section of LCD ?

Thank You!!
@lautr3k

This comment has been minimized.

Sign in to view
Copy link
Owner

commented Aug 23, 2017 •
edited

This is not an issue related to SLAcer.js. Be free to ask this kind of questions on the uTopia printer project page or on the OpenSLA community page.

That said, the focal length of my fresnel lens is 60mm, and it only serves to straighten the rays before the LCD (it probably also blocks some UV light), I do not know where I had recovered it (5 or 6 years ago), but you can find it everywhere (ebay). Ideally the focal length of the fresnel should coincide with the focal length of the collimating lens.

Peace ;)
@lautr3k lautr3k closed this Aug 23, 2017
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
Assignees
No one assigned
Labels
None yet
Projects
None yet
Milestone
No milestone
2 participants
@vikrant8051 @lautr3k
You can’t perform that action at this time.