This photo IC was developed to detect the beam passage timing of the write laser used for laser printers and digital copiers, etc. It contains a high-speed photodiode and high-speed signal processing circuit to provide stable detection timing.
The analog amplitude (voltage change generated by passage of laser beam) at the Ro terminal is expressed as Vro＝Current gain x Photosensitivity x External gain resistance. External gain resistance is selected so that Vro is set to 2 to 3 V (resistance is selected in a range from 1 to 10 kilohms). Current gains of 4, 6, and 20 times are provided and selectable to match the laser beam power. In the case of dual-element type, use a resistor of the same resistance for connection to Ro1 and Ro2.
Single-element types can be scanned in either left or right direction, but dual-element types should be scanned in the direction from Ch 1 to Ch 2.
Detection is possible at 0.5 V and higher.
To utilize an advantage offered by dual-element types, which is timing stability versus power and temperature fluctuations, the Ro1 and Ro2 terminal voltage waveforms must form a cross (X) shape at the center of the dual-element photodiode. As a calculated figure, the analog amplitude that can be obtained as output is 1.5 to 8 V. However, setting the analog amplitude too high may cause faulty operation due to stray light inside the package (stray light occurring at about 6% of the ΔVRo). Setting the upper limit somewhat larger than 3 V (up to about 6 V) will not cause problems, but an excessively large analog amplitude may make it difficult to obtain a stable output, so up to 3 V is recommended.
An amplitude level greater than or equal to 1.5 V will not cause problems. However, a level below 1.5 V will prevent obtaining a cross waveform from the gain resistance terminals, so the output will no longer be stable during power and temperature fluctuations.
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