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| LED Infrared LED L8506 LED emitting collimated light When an LED is used for optical encoders, it must emit a uniform, small spot light. L8506 is an infrared LED that emits such a light beam collimated by the combination of an aspheric lens. L8506 uses a non-confined structure chip that does not show an abrupt deterioration often encountered with some types of confined chips. The structure of L8506 is also designed to have high resistance to cyclic temperature changes so it copes with tough environmental conditions required for optical encoders used in factories. Features Applications l Collimated light beam l Uniform spot light l Narrow directivity: 5 l High-speed response: 40 MHz Typ. l High reliability l Optical encoder l Optical switch s Absolute maximum ratings (Ta=25 C, unless otherwise noted) Parameter Reverse voltage Forward current Forward current reduction rate Pulse forward current P uls e forw ard current reduction rate Power dissipation Operating temperature Storage temperature Symbol VR IF IFP P Topr Tstg Condition Value 5 80 0.67 0.5 7 150 -30 to +85 -40 to +100 Unit V mA mA/C A mA/C mW C C Pulse width=10 s Duty ratio=1 % s Electrical and optical characteristics (Ta=25 C) Parameter Symbol Condition Min. Typ. Max. Unit Peak emission wavelength IF=50 mA 840 870 900 nm p Spectral half width IF=50 mA 45 nm Radiant flux IF=50 mA 3.4 5.8 mW e Forward voltage VF IF=50 mA 1.6 1.75 V Reverse current IR VR=5 V 5 A Spot light size *1 IF=30 mA 4.3 mm Cut-off frequency *2 fc IF=30 mA 4 mAp-p 25 40 MHz *1: Full width at half maximum, measurement distance (from the sensor to the bottom surface of L8506's base)=10 mm *2: Frequency at which the light output drops by -3 dB from that at 100 kHz. 1 Infrared LED s Directivity (Typ. Ta=25 C) 20 10 0 100 % 30 80 % 30 10 20 100 (Typ. Ta=25 C) L8506 s Forward current vs. forward voltage FORWARD CURRENT (mA) 80 40 60 % 40 60 50 60 70 80 90 40 % 50 60 40 20 % 70 80 90 20 0 0.5 1.0 1.5 2.0 RELATIVE RADIANT OUTPUT (%) KLEDB0226EA FORWARD VOLTAGE (V) KLEDB0227EA s Radiant output vs. ambient temperature +2 (Typ. IF=50 mA) s Allowable forward current vs. ambient temperature (Typ.) RELATIVE ALLOWABLE FORWARD CURRENT (%) 100 RELATIVE RADIANT OUTPUT (dB) +1 80 0 60 -1 40 -2 20 -3 0 20 40 60 80 100 0 -40 -20 0 20 40 60 80 100 AMBIENT TEMPERATURE (C) KLEDB0228EA AMBIENT TEMPERATURE (C) KLEDB0229EB s Relative light intensity distribution 100 L=5 mm s Dimensional outline (unit: mm) 5.4 0.2 4.65 0.15 RELATIVE RADIANT OUTPUT (%) 80 L=10 mm 60 L=20 mm 3.7 0.2 40 20 0.45 LEAD LED L IMAGE SENSOR 0.6 MAX. 2.54 0.2 0 -4 -3 -2 -1 0 1 2 3 4 POSITION ON IMAGE SENSOR (mm) KLEDB0230EA 13.5 1.0 5.3 0.3 (0.4) KLEDA0072EC Information furnished by HAMAMATSU is believed to be reliable. However, no responsibility is assumed for possible inaccuracies or omissions. Specifications are subject to change without notice. No patent rights are granted to any of the circuits described herein. (c)2002 Hamamatsu Photonics K.K. HAMAMATSU PHOTONICS K.K., Solid State Division 1126-1 Ichino-cho, Hamamatsu City, 435-8558 Japan, Telephone: (81) 053-434-3311, Fax: (81) 053-434-5184, http://www.hamamatsu.com U.S.A.: Hamamatsu Corporation: 360 Foothill Road, P.O.Box 6910, Bridgewater, N.J. 08807-0910, U.S.A., Telephone: (1) 908-231-0960, Fax: (1) 908-231-1218 Germany: Hamamatsu Photonics Deutschland GmbH: Arzbergerstr. 10, D-82211 Herrsching am Ammersee, Germany, Telephone: (49) 08152-3750, Fax: (49) 08152-2658 France: Hamamatsu Photonics France S.A.R.L.: 8, Rue du Saule Trapu, Parc du Moulin de Massy, 91882 Massy Cedex, France, Telephone: 33-(1) 69 53 71 00, Fax: 33-(1) 69 53 71 10 United Kingdom: Hamamatsu Photonics UK Limited: 2 Howard Court, 10 Tewin Road, Welwyn Garden City, Hertfordshire AL7 1BW, United Kingdom, Telephone: (44) 1707-294888, Fax: (44) 1707-325777 North Europe: Hamamatsu Photonics Norden AB: Smidesvagen 12, SE-171 41 Solna, Sweden, Telephone: (46) 8-509-031-00, Fax: (46) 8-509-031-01 Cat. No. KLED1035E02 Italy: Hamamatsu Photonics Italia S.R.L.: Strada della Moia, 1/E, 20020 Arese, (Milano), Italy, Telephone: (39) 02-935-81-733, Fax: (39) 02-935-81-741 Feb. 2002 DN 2 |
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