Optical: systems and elements – Deflection using a moving element
Patent
1998-03-26
1999-08-03
Phan, James
Optical: systems and elements
Deflection using a moving element
359206, 359216, 347250, 250235, G02B 2608
Patent
active
059332662
ABSTRACT:
An optical scanning device is comprised of a light source unit, a rotating polygon mirror, an f.theta. lens, a photosensitive drum, a synchronization signal generating circuit 10, etc. Synchronization signal generating circuit 10 has a photodiode 6, and a resonance circuit 31, comprised of a parallel circuit of coil 32, capacitor 33, and resistor 34, is connected to photodiode 6 as its load circuit. An amplifier 35 is connected to the junction of photodiode 6 and resonance circuit 31, a capacitor 36 is connected to the output side of amplifier 35, and the other end of capacitor 36 is connected to the positive input terminal of comparator 38. A reference voltage generator 39 of variable reference voltage is connected to the negative input terminal of comparator 38 and a reference voltage is applied from this reference voltage generator 39.
REFERENCES:
patent: 5087813 (1992-02-01), Negishi
patent: 5153604 (1992-10-01), Tutiyasu
patent: 5708472 (1998-01-01), Morisawa et al.
patent: 5739849 (1998-04-01), Aoki et al.
Copy of a Search Report cited in counterpart U.K. Patent Application No. GB 9806665.7 on Jul. 27, 1998.
Asahi Kogaku Kogyo Kabushiki Kaisha
Phan James
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