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'[EE] SMD side-looking reflective opto sensor?'
2016\09\27@203437 by Neil

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Well since y'all are bored and missing some action in this group...

Anyone know of a side-looking relective opto sensor like this ( http://www.digikey.com/product-search/en?keywords=tcrt1000 ), but SMD?
Shorter (ie: does not stick up as much off the PCB) would be nice also.  This one is 6.1mm high and 4mm would be nice.

Cheers,
-Neil.

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2016\09\28@000416 by stephen.forrestn/a

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Discrete LED & photodiode?
I've used Osram SFH325FA with SFH426-Z as a side-looking reflective opto. 4mm high and <$1 per pair. (SFH4244-Z is the closest that Digikey have...)

<http://www.digikey.com/product-detail/en/osram-opto-semiconductors-inc/SFH-325-FA-3-4-Z/475-1450-1-ND/1228095>

<http://www.digikey.com/product-detail/en/osram-opto-semiconductors-inc/SFH-325-FA-3-4-Z/475-1450-1-ND/1228095>

Stephen

{Original Message removed}

2016\09\28@001344 by stephen.forrestn/a

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Oops - I meant
<http://www.digikey.com/product-detail/en/osram-opto-semiconductors-inc/SFH-4244-Z/475-2867-1-ND/2207284>

S.

{Original Message removed}

2016\09\29@011130 by Neil

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I'm kinda liking this -- using separate pieces.

On the plus side, with separate pieces I can control the angle to work best with the stripe-patterned part that this will be looking at.  But curious how sensitive it will be to placement tolerances during manufacturing.  With a one-piece unit, a variance in how far it is from the stripe-patterned part is already a concern, but I'm wondering how much rotation tolerance it can handle.  Any thoughts on that?

FWIW, I'm making effectively a nest-type interface for a product, where the outer ring becomes the quadrature encoder control knob.

Cheers,
-Neil.



On 9/28/2016 12:04 AM, spam_OUTstephen.forrestTakeThisOuTspamagilent.com wrote:
> Discrete LED & photodiode?
> I've used Osram SFH325FA with SFH426-Z as a side-looking reflective opto.
> 4mm high and <$1 per pair. (SFH4244-Z is the closest that Digikey have...)
>
> <http://www.digikey.com/product-detail/en/osram-opto-semiconductors-inc/SFH-325-FA-3-4-Z/475-1450-1-ND/1228095>
>
> <http://www.digikey.com/product-detail/en/osram-opto-semiconductors-inc/SFH-325-FA-3-4-Z/475-1450-1-ND/1228095>
>
> Stephen
>
> {Original Message removed}


'[EE] SMD side-looking reflective opto sensor?'
2016\10\02@172119 by stephen.forrestn/a
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Hi Neil -

In my application placement was not *that* sensitive - either the pair were completely blocked or were reflecting into a cavity. However, from memory, the angles of view of the two devices easily accommodated assembly tolerances in placement. It would be worth the time to check the geometry for target distance (something that needs doing for an integrated device anyway...)

Good luck!
Stephen


{Original Message removed}

2016\10\03@104928 by Neil

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Funny you should say that... I am working with the customer (who's handling the physical design) to see if we can change the reflective "teeth" to comb-like teeth so the emitter and receiver can be placed on opposite side, as for the reflective version, the texture of the teeth would play a part.  Those teeth are being injection molded.

Cheers,
-Neil.




On 10/2/2016 5:21 PM, .....stephen.forrestKILLspamspam@spam@agilent.com wrote:
> Hi Neil -
>
> In my application placement was not *that* sensitive - either the pair were completely blocked or were reflecting into a cavity. However, from memory, the angles of view of the two devices easily accommodated assembly tolerances in placement. It would be worth the time to check the geometry for target distance (something that needs doing for an integrated device anyway....)
>
> Good luck!
> Stephen
>
>
> {Original Message removed}

2016\10\03@131157 by Van Horn, David

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Be careful that the plastics house doesn't switch your plastic to something that blocks visible light but passes infrared.
Been there, done that.  It sucked.

It looked the same, but the original blocked near IR, and the substitute was something like 90% transmission.



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