Method and system of driving light source

Claim 1

A method of driving a fluorescent indicator tube light source for reading a picture image, comprising a first step of applying to an anode of said fluorescent indicator tube an opposite polarity voltage having a polarity opposite to that of a voltage applied to said light source in a substantial picture-reading period, during a first predetermined period immediately before said substantial picture-reading period, a second step of applying a normal polarity voltage to said anode of the fluorescent indicator tube during the substantial picture-reading period, and a third step of applying said opposite polarity voltage to the anode of the fluorescent indicator tube during a second predetermined period immediately after the substantial picture-reading period.

Claim 2

A method of driving a fluorescent indicator tube light source for reading a picture image, comprising a first step of applying to an anode of said fluorescent indicator tube an opposite polarity voltage having a polarity opposite to that of a voltage applied to said light source in a substantial picture-reading period, during a first predetermined period immediately before said substantial picture-reading period, a second step of applying a normal polarity voltage to said anode of the fluorescent indicator tube during the substantial picture-reading period, and a third step of applying said opposite polarity voltage to the anode of the fluorescent indicator tube during a second predetermined period immediately after the substantial picture-reading period.

Claim 3

A method of driving a light source for reading or recording a picture image comprising the steps of applying to said light source an opposite polarity voltage having a polarity opposite to a polarity of an operating voltage that places the light source in operation, and applying to said light source a voltage of the operating plurality immediately after terminating the application of the opposite polarity voltage.

Claim 4

A method of driving a light source for reading or recording a picture image comprising the steps of applying to said light source an opposite polarity voltage having a polarity opposite to a polarity of an operating voltage that places the light source in operation, and applying to said light source a voltage of the operating plurality immediately after terminating the application of the opposite polarity voltage.

Claim 6

A system of driving a light source for picture reading or recording comprising: means for generating a first application voltage left necessary for lighting up said light source in said picture reading or recording mode and a second application voltage having a polarity opposite to that of said first voltage; switching means for selecting either one of said first and second application voltages generated by said voltage generating means; and timing control means for switching said switching means to select said second application voltage during at least one predetermined period other than a substantial operating period, the predetermined period being immediately before and immediately after said substantial operation period for said reading or recording of the picture.

Claim 7

A system of driving a light source for picture reading or recording comprising: means for generating a first application voltage left necessary for lighting up said light source in said picture reading or recording mode and a second application voltage having a polarity opposite to that of said first voltage; switching means for selecting either one of said first and second application voltages generated by said voltage generating means; and timing control means for switching said switching means to select said second application voltage during at least one predetermined period other than a substantial operating period, the predetermined period being immediately before and immediately after said substantial operation period for said reading or recording of the picture.

Claim 12

A method of driving a fluorescent lamp light source for reading or recording picture image, comprising the step of applying to the anode of said fluorescent lamp light source an opposite polarity voltage having a polarity opposite to that of a voltage for lighting said fluorescent lamp light source in synchronism with rise and fall of an enable signal for enabling said fluorescent lamp light source during a period when said light source is lit so as to prevent brightness of said fluorescent lamp light source from being deteriorated.

Claim 13

A method of driving a fluorescent lamp light source for reading or recording picture image, comprising the step of applying to the anode of said fluorescent lamp light source an opposite polarity voltage having a polarity opposite to that of a voltage for lighting said fluorescent lamp light source in synchronism with rise and fall of an enable signal for enabling said fluorescent lamp light source during a period when said light source is lit so as to prevent brightness of said fluorescent lamp light source from being deteriorated.

Claim 15

A method of driving a fluorescent lamp light source having a plurality of fluorescent lamps arranged in line, wherein each fluorescent lamp of said fluorescent lamp, that is in a time sharing manner, and an opposite polarity voltage is applied to an anode of said each fluorescent lamp during a part of said allocated period, said opposite polarity voltage having a polarity opposite to that applied during a period when the fluorescent lamp is lit.

Claim 16

A method of driving a fluorescent lamp light source having a plurality of fluorescent lamps arranged in line, wherein each fluorescent lamp of said fluorescent lamp, that is in a time sharing manner, and an opposite polarity voltage is applied to an anode of said each fluorescent lamp during a part of said allocated period, said opposite polarity voltage having a polarity opposite to that applied during a period when the fluorescent lamp is lit.

Claim 17

A method of driving a fluorescent lamp light source having a plurality of fluorescent lamps arranged in line, wherein each fluorescent lamp of said fluorescent lamp light source is lit during a period allocated to said each flourescent lamp, that is in a time sharing manner, and an opposite polarity voltage is applied to an anode of each said fluorescent lamp during a part of said allocated period so as to refresh brightness of said fluorescent lamp light source, said opposite polarity voltage having a polarity opposite to that applied during a period when the fluorescent lamp is lit, and said opposite polarity voltage is prohibited from being applied during a period when said fluorescent lamp is not lit.

Claim 18

A method of driving a fluorescent lamp light source having a plurality of fluorescent lamps arranged in line, wherein each fluorescent lamp of said fluorescent lamp light source is lit during a period allocated to said each flourescent lamp, that is in a time sharing manner, and an opposite polarity voltage is applied to an anode of each said fluorescent lamp during a part of said allocated period so as to refresh brightness of said fluorescent lamp light source, said opposite polarity voltage having a polarity opposite to that applied during a period when the fluorescent lamp is lit, and said opposite polarity voltage is prohibited from being applied during a period when said fluorescent lamp is not lit.

Claim 19

An apparatus for driving a fluorescent lamp light source used for reading or recording a picture image, comprising: filament driving means for driving a filament of said fluorescent lamp light source so as to generate and enable signal for enabling the driving of said fluorescent lamp light source; light amount control means for generating a first voltage to be applied to an anode of said fluorescent lamp light source and a second voltage having a polarity opposite to that of said first voltage; switching means for applying said first voltage and said second voltage; and timing control means for controlling said switching means such that said second voltage is selected to be applied to an anode of said fluorescent lamp light source lamp in synchronism with rise and fall of said fall of an enable signal supplied from said filament driving means, and said first voltage is selected to be applied to said anode during a period when said fluorescent lamp light is lit.

Claim 20

An apparatus for driving a fluorescent lamp light source used for reading or recording a picture image, comprising: filament driving means for driving a filament of said fluorescent lamp light source so as to generate and enable signal for enabling the driving of said fluorescent lamp light source; light amount control means for generating a first voltage to be applied to an anode of said fluorescent lamp light source and a second voltage having a polarity opposite to that of said first voltage; switching means for applying said first voltage and said second voltage; and timing control means for controlling said switching means such that said second voltage is selected to be applied to an anode of said fluorescent lamp light source lamp in synchronism with rise and fall of said fall of an enable signal supplied from said filament driving means, and said first voltage is selected to be applied to said anode during a period when said fluorescent lamp light is lit.

Claim 21

A method of driving a fluorescent lamp light source for reading or recording a picture image comprising the step of applying to the anode of said fluorescent lamp light source an opposite polarity voltage having a polarity opposite to that of a voltage for lighting said fluorescent lamp light source in synchronism with the rise and fall of an enable signal for enabling said fluorescent lamp light source during a period when said light source is lit so as to prevent the brightness of said fluorescent lamp light source from being deteriorated.

Claim 22

A method of driving a fluorescent lamp light source for reading or recording a picture image comprising the step of applying to the anode of said fluorescent lamp light source an opposite polarity voltage having a polarity opposite to that of a voltage for lighting said fluorescent lamp light source in synchronism with the rise and fall of an enable signal for enabling said fluorescent lamp light source during a period when said light source is lit so as to prevent the brightness of said fluorescent lamp light source from being deteriorated.

Claim 24

A device for driving a fluorescent lamp light source used for reading or recording a picture image, comprising: filament driving means for driving a filament of said fluorescent lamp light source so as to generate an enable signal to enabling the driving of said fluorescent lamp light source; light amount control means for generating a first voltage to be applied to an anode of said fluorescent lamp light source and a second voltage having a polarity opposite to that of said first voltage; switching means for applying said first voltage and said second voltage; and timing control means for controlling said switching means such that said second voltage is selected to be applied to an anode of said fluorescent lamp light source lamp in synchronism with rise and fall of said fall of an enable signal supplied from said filament driving means, and said first voltage is selected to be applied to said anode during a period when said fluorescent lamp light is lit.

Claim 25

A device for driving a fluorescent lamp light source used for reading or recording a picture image, comprising: filament driving means for driving a filament of said fluorescent lamp light source so as to generate an enable signal to enabling the driving of said fluorescent lamp light source; light amount control means for generating a first voltage to be applied to an anode of said fluorescent lamp light source and a second voltage having a polarity opposite to that of said first voltage; switching means for applying said first voltage and said second voltage; and timing control means for controlling said switching means such that said second voltage is selected to be applied to an anode of said fluorescent lamp light source lamp in synchronism with rise and fall of said fall of an enable signal supplied from said filament driving means, and said first voltage is selected to be applied to said anode during a period when said fluorescent lamp light is lit.