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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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SFH7773 датащи(PDF) 6 Page - OSRAM GmbH |
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SFH7773 датащи(HTML) 6 Page - OSRAM GmbH |
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6 / 23 page  cover glass. A common and proven solution is the use of an external separator to avoid the reflections from the cover glass. However, such a separator causes additional design-in effort. Due to its design the SFH 7773 is crosstalk- insensitive for a range of typical applications. Fig. 11 and 12 present this range as a function of cover glass thickness vs. the spacing between the bottom of the cover glass and the SFH 7773 (airgap). Typical applications where the SFH 7773 works without an external separator are e.g. 0.8 mm cover glass and an airgap of 0.7 mm. Note that the crosstalk-free range depends on the actual design of the cover glass aperture. To utilize the full potential of the SFH 7773 it is recommended to use an aperture design within the cover glass (please refer to Sec. 10.1 for more details). Beyond the “crosstalk-free” indicated area a separator is recommended. In any case it is recommended to verify the actual design. Please note that beyond the proposed “crosstalk-free”-range the sensor works as well, but might experience a certain offset- level, dependent, among other issues, on the type of glass. Please note that coloured (dark) cover glasses might reduce the “crosstalk-free”-range, depending on the type/quality of the cover glass. Experimental verification of the behaviour is mandatory here. 0.00 0.25 0.50 0.75 1.00 0.00 0.25 0.50 0.75 1.00 external Separator recommended Cover Glass Thickness / mm "Crosstalk-free" - Range Boundary for C'over Design with Aperture SFH7773 Fig. 12: Crosstalk-free range: Cover glass thickness vs. airgap. The device is “crosstalk-free” for e.g. 1.0 mm cover glass and an airgap of 0.7 mm. 0 25 50 75 100 125 150 50 100 150 200 250 Target Distance / mm 0 lx 50k lx Halogen Lamp I LED = 200 mA, tburst = 1000 us Kodak White 90 %, 100 x 100 mm2 50k lx at SFH 7773 from Halogen Lamp Fig. 13: Proximity signal in different ambient light conditions. Even in a high brightness environment (50k lx on SFH 7773, ILED = 200 mA) the sensor shows no significant changes. 0.00 0.25 0.50 0.75 1.00 0.00 0.25 0.50 0.75 1.00 external Separator recommended Cover Glass Thickness / mm "Crosstalk-free" - Range Boundary for Cover Design without Aperture SFH7773 Fig. 11: Crosstalk-free range: Cover glass thickness vs. airgap. The device is “crosstalk-free” for e.g. 0.2 mm cover glass and an airgap of 0.5 mm. To achieve optimized performance a two-hole aperture design is recommended (see Fig. 12). 5.5. Ambient Light Suppression of the PS-Signal Due to its design the SFH 7773 features an excellent immunity of the proximity measurement against even ultra-high December 12, 2011 page 6 of 23 |
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