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Optek Develops Miniature Infrared Surface Mount Reflective Object Sensor

12th February 2009

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Providing design engineers with an economical device for non-contact sensing applications, TT electronics OPTEK Technology has developed a new reflective object sensor in a miniature surface mount package. Designated the OPB733TR device, the infrared sensor uses a lensed IR LED and phototransistor elements to collimate the light beam, giving the device an optimizing detection range from 0.4 (10mm) to 1.0 (25.4mm). In addition, the minimum phototransistor output current of 100mA eliminates the need for external amplification of the output signal, thus simplifying the drive circuitry.

We developed the OPB733TR sensor in response to customer requests for a small foot print, surface mount IR reflective sensor with a longer detecting range, said Alan Bennett, vice president of sales for OPTEK Technology. The addition of collimating lenses to our standard IR LEDs and phototransistors enhanced the sensor's resolution as well as its detection range.

The OPB733TR sensor consists of an IR LED with typical peak emission wavelength of 890nm, mounted alongside a NPN silicon phototransistor, which responds to light reflected by the object being sensed. The phototransistor output on-state collector current is 0.1mA (100mm) at 1/2 [12.7mm] distance from the target and a 20mA forward current and VCE of 5V. Rise and fall time for the phototransistor signal is typically 15mS.

The sensor features a molded dark epoxy package to minimize ambient visible light interferences, and measures just 0.300 [7.62mm] x 0.160 [4.06mm] with a PC board-mounted profile of just 0.114 [2.89mm]. The surface mount package is reflow solder compatible to 260°C. The sensors are available in 16mm tape on 7 diameter reels, 500 pieces per reel.

The sensors are ideal for non-contact sensing of reflective objects in applications including paper edge detection in office machines, mail sorting machines, and printing equipment; coin recognition, bill and card detection in vending machines and ATMs; automatic sensing applications for soap or towel dispensers; counting, sorting and proximity sensing in industrial applications, as well as door and end-of-travel sensing and other safety applications.