DISCLAIMER: There is no guarantee that this method is safe. However, you can ensure to protect your eyes by using the "digital camera LCD screen" for viewing. As for ensuring the safety of your gadget, all "digital camera sensors" have an IR cut-off filter, and a UV-absorbing thin-film coatings for protection.
Step 1: What you need?
2) Cardboard – I found used cardboard at home. A great way to recycle.
3) Glue, Electrical and Clear Tape
4) Cutters and Scissors
5) Plastic Ruler