The infrared Mini Midled from Osram Opto Semiconductors is only 0.9
millimeters high but this tiny device produces a narrow and intense
beam of infrared light. With its radiant intensity of 60 milliwatts per
steradian (mW/sr) at 100 milliamperes (mA) it easily outperforms other
comparable devices. This low-profile surface-mountable emitter is ideal
particularly for proximity sensors in devices where space is limited
and for light barriers.
In many sensor applications it is not only the optical power of an
emitter that is important but also whether the available light is
widely spread or concentrated in a narrow high-power beam. This is
characterized by the half-angle. The radiant intensity (measured in
watts per steradian) indicates the optical power within a solid angle
and therefore defines the intensity of the emitted light beam.
The great advantage of the new Mini Midled is its half-angle of
17°, producing a narrow light beam and a radiant intensity of 60
mW/sr at 100 mA. This is achieved by focusing the light with a
metalized reflector integrated in the device. The new infrared LED
offers a high output despite its exceptionally small dimensions of just
2.3 x 1.95 x 0.9 mm.
The Mini Midled is the second SMT device from Osram Opto Semiconductors
in MID (Molded Interconnected Device) technology, following the 1.6 mm
high Midled. Thanks to new package technologies, Osram has managed to
reduce the total height of the new infrared emitter to less than one
millimeter but the new device can still be processed in the usual way.
Small and powerful infrared diodes with a wavelength of 850 nm, such as
the low-profile narrow-beam Mini Midled, offer major benefits in
applications where there is little space but high radiant intensity is
needed. Typical applications include light barriers, smart phones and
optical touch screens.No crosstalk
Bianka Schnabel, Marketing Manager at Osram Opto Semiconductors, has
high expectations for the new mini emitter. “The low-profile Mini
Midled is particularly suitable as an emitter for proximity sensors in
smart phones and similar devices because it takes up very little space
and yet delivers high power. Thanks to its sophisticated design, it
also considerably reduces optical crosstalk so no optical shielding is
required, which makes life easier for designers.“
Proximity sensors are a combination of an emitter and a detector. The
emitter illuminates an approaching object, and the light reflected from
the object is received by the detector. For proximity sensors to
operate properly it is crucial that no light from the emitter should
reach the detector directly (crosstalk). This is precisely what often
happens with devices that are not equipped with a metalized reflector.
But with the Mini Midled there is no need for shielding and the overall
design is much simpler.
The non-metalized surfaces are dark colored so the Mini Midled can be mounted inconspicuously behind a smart phone cover.
- Dimensions (2.3 x 1.95 x 0.9) mm
- Emission angle +- 17°
- Radiant intensity 60 mW/sr at 100 mA
- Wavelength 850 nm
For more information go to www.osram-os.com/