This part is a kind of semiconductor called RL46.

Function of this product has Laser Encoder.

Manufacturers : Copal

Image and pinout :

Some of the text within the PDF file :

COPAL ELECTRONICS LASER ENCODERS RL46 s FEATURES q High resolution 20000 P/R q High frequency response 500 kHz q Compact φ 46 and light weight 150 g q Simple construction s PART NUMBER DESIGNATION RL 46 - 20000 - 2 1 1 - 1 Series name Output connection 1 : Cable wire Resolution (P/R) 20000 Input voltage 1:5V Output phase 2 : “A” & “B” Output phase “Z” 1 : Provided s LIST OF PART NUMBERS Resolution 20000 (P/R) Item Input voltage 5V Maximum frequency response 500 kHz Part number RL46-20000-211-1 ❈ Verify the above part numbers when placing orders. s STANDARD SPECIFICATIONS q Electrical characteristics Input voltage Input current Output wave form Output phases Resolution (P/R) Phase difference of outputs A & B Maximum frequency response [ ... ]

RL46 PDF Datasheet Download