| Specification of "ideal" point source LED in optical encoders
1. Point Source (150μm or smaller) without edge emission
2. Peak emission wavelength: 850-880nm
3. Maximum forward current(*):
T = 25°C: @ I = 100 mA
T = 75°C: @ I = 70 mA
T = 125°C: @ I = 40 mA
4. Optical output power in forward direction(*): P(0°) = 1.5 mW/sr @ I = 50 mA
Ptotal = 3.5 mW @ I = 50 mA
?P ± 10%
(if larger: division into two classes possible)
5. Tc-value of Po = -0.1%/°C
6. Emission angle > 70°: P(+/- 35°) > 0.8 P(0°)
7. Median life time > 50.000 h
P(50k h) = 0.5 P(0h) @ T = 125°C , I = 80mA
(*) as mounted on TO18-header
Welcomt to discussion for Enconder
E-mail:chi.chang@msa.hinet.net 
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1 2005-03-03 17:55:07