Identify this opto component?
I am trying to identify these two clear parts which were part of an opto components grab bag. Which contained UV/IR components/sensors. They are clear plastic with the marking of 'SD 6150 205' on the back. (nothing on google) Facing the front. A part inside that looks like a 4 section solar panel. 5 pins. The far left pin is the ground inside for the panel. The 4 other pins attach to the 4 sections of the panel via a microscopic wire. The left pin connects to the leftmost panel. Next pin, next panel, etc.
If I had to guess... A position sensor that uses a laser or pinpoint of light to pinpoint direction/placement based on light hitting a specific (or multiple) panels.
Does anyone know for sure? Better yet, a datasheet?
Be kind, teaching myself electronics as I go (and having a ball!)