Patent ID: 6150651
Filing Date: 2000-11-21
Classification: H01L

Abstract:
A photointerrupter driving circuit for use in a flexible disk drive for driving a flexible disk having a magnetic recording medium loaded therein, wherein said photointerrupter driving circuit is for driving a photointerrupter for use in detecting a position of the most end track of the magnetic recording medium of said flexible disk, said photointerrupter comprising a light emitting diode and a photo transistor which are opposed to each other, the light emitting diode having an anode connected to a power supply terminal while the photo transistor has a collector connected to the power supply terminal, said photointerrupter driving circuit comprising:a resistor coupled between an emitter of said photo transistor and a grounding terminal; andan integrated circuit having an input terminal connected to a cathode of said light emitting diode, said integrated circuit being for controlling said flexible disk drive, said integrated circuit incorporating a constant current source which is connected to the input terminal through switching device.