SCE-PS3-RD-R-LATIN.TTF is the font used.
You can use PS3Tools to extract it from a PS3 firmware PUP. 

Riku - "it can be found and dumped from PS3 dev_flash, name is 'SCE-PS3-RD-L-LATIN.TTF'" 
Shadowtrance - "Actually it isn't SCE-PS3-RD-L-LATIN.TTF (light) it's SCE-PS3-RD-R-LATIN.TTF (Regular)"