Unknown optointeruptor

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boylesg

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Does anyone know what type of optointeruptor this is?

If not the precise manufacturer and component then a similar one so that I can figure out what all the leads are for and at least some rough characteristics.

There were some other simpler photointerruptors with 4 leads, much wider gaps and similar ones were easy to find on the web.

It is from a printer and a disk of thin plastic with very fine dark lines along the edge rotates between the phototransistor and the LED

On the back is A15 6445.

It has 6 leads, 2 on the LED side and 4 on the phototransistor side.
 

It's an incremental encoder, similar to Avagotech HEDS series.
 

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