PCN-20070504-01.pdf Photointerrupters:Internal Chip Change. The infrared emitter chips used in the listed Sharp devices will be changed to allow for a more stable source of supply. This change will take place as a running change to production beginning in June, 2007.
PCN-030207-3.pdf Factory Location Change: GP1A52HRJ00F, GP1A52LRJ00F, GP1A53HRJ00F, GP1A530BJ00F, GP1A58HRJ00F, GP1A58QEJ00F. Delivery from this new factory site will begin with orders filled in May, 2007.
gp1a52lr_e.pdf Gap : 3mm, Slit : 0.5mm, OPIC Output Case package Transmissive Photointerrupter.