Fluorescent indicator apparatus

Claim 2

A fluorescent indicator apparatus comprising: a first display section including a plurality of first-type light-emitting portions, each of which has a first luminous efficiency for emitting a first light; first driving means for periodically driving each of the first-type light-emitting portions in a predetermined order so that each of the first-type light-emitting portions sequentially emits the first light; synchronizing control means, connected to the first driving means, for producing a synchronizing control signal only while the first driving means drives at least two predetermined portions of the first-type light-emitting portions; a second display section including a second-type light-emitting portion having a second luminous efficiency, which is lower than the first luminous efficiency, for emitting a second light; and second driving means, cocnnected to the synchronizing control means, for driving the second-type light-emitting portion in response to the synchronizing control signal so that a brightness of the second display section is substantially equal to that of the first display section.

Claim 3

A fluorescent indicator apparatus comprising: a first display section including a plurality of first-type light-emitting portions, each of which has a first luminous efficiency for emitting a first light; first driving means for periodically driving each of the first-type light-emitting portions in a predetermined order so that each of the first-type light emitting portions sequentially emits the first light; synchronizing control means, cocnnected to the first driving means, for producing a first synchronizing control signal only while the first driving means drives a predetermined portion of the first-type light-emitting portions, and for producing a second synchronizing control signal only while the first driving means drives another predetermined portion of the first-type light-emitting portions; a second display section including a second-type light-emitting portion for emitting a second light in accordance with a second luminous efficiency which is lower than the first luminous efficiency, and a third-type light-emitting portion for emitting a third light in accordance with a third luminous efficiency which is substantially equal to the first luminous efficiency; and second driving means, connected to the synchronizing control means, for driving the second-type light-emitting portion in response to the first and second synchronizing control signals, and for driving the third-type light-emitting portion in response to the second synchronizing control signal so that the brightness of the second display section is substantially equal to that of the first display section.

Claim 4

A fluorescent indicator apparatus comprising: a first display section including a plurality of first-type light-emitting portions, each of which has a first luminous efficiency for emitting a first light; first driving means for periodically driving each of the first-type light-emitting portions in a predetermined order so that each of the first-type light emitting portions sequentially emits the first light; synchronizing control means, cocnnected to the first driving means, for producing a first synchronizing control signal only while the first driving means drives a predetermined portion of the first-type light-emitting portions, and for producing a second synchronizing control signal only while the first driving means drives another predetermined portion of the first-type light-emitting portions; a second display section including a second-type light-emitting portion for emitting a second light in accordance with a second luminous efficiency which is lower than the first luminous efficiency, and a third-type light-emitting portion for emitting a third light in accordance with a third luminous efficiency which is substantially equal to the first luminous efficiency; and second driving means, connected to the synchronizing control means, for driving the second-type light-emitting portion in response to the first and second synchronizing control signals, and for driving the third-type light-emitting portion in response to the second synchronizing control signal so that the brightness of the second display section is substantially equal to that of the first display section.

Claim 5

A fluorescent indicator apparatus comprising: a first display section including a plurality of grids and a plurality of sets of anode segments, each segment having an equal first luminous efficiency for emitting a first light, wherein a plurality of first-type light-emitting portions are formed by the respective combinations of each grid and each set of the anode segments; grid driving means for periodically driving the grids of the first display section in a predetermined order; anode driving means for driving the anode segments of each set in synchronism with the driving of the grids so that each first-type light-emitting portion sequentially emits the first light; synchronizing control means, connected to the grid driving means, for producing a synchronizing control signal only while the grid driving means drives at least two predetermined grids of the first display section; a second display section including a second-type light-emitting portion formed by a grid and an anode segment, wherein the second-type light-emitting portion emits a second light in accordance with a second luminous efficiency which is lower than the first luminous efficiency; and second-type light-emitting portion driving means, connected to the synchronizing control means, for driving the grid and the anode segment of the second-type light-emitting portion in response to the synchronizing control signal so that a brightness of the second display section is substantially equal to that of the first display section.

Claim 6

A fluorescent indicator apparatus comprising: a first display section including a plurality of grids and a plurality of sets of anode segments, each segment having an equal first luminous efficiency for emitting a first light, wherein a plurality of first-type light-emitting portions are formed by the respective combinations of each grid and each set of the anode segments; grid driving means for periodically driving the grids of the first display section in a predetermined order; anode driving means for driving the anode segments of each set in synchronism with the driving of the grids so that each first-type light-emitting portion sequentially emits the first light; synchronizing control means, connected to the grid driving means, for producing a synchronizing control signal only while the grid driving means drives at least two predetermined grids of the first display section; a second display section including a second-type light-emitting portion formed by a grid and an anode segment, wherein the second-type light-emitting portion emits a second light in accordance with a second luminous efficiency which is lower than the first luminous efficiency; and second-type light-emitting portion driving means, connected to the synchronizing control means, for driving the grid and the anode segment of the second-type light-emitting portion in response to the synchronizing control signal so that a brightness of the second display section is substantially equal to that of the first display section.

Claim 7

A fluorescent indicator apparatus according to the claim 3 further comprising: a filament for emitting electrons for causing said anode segments of said first and second display sections to emit the first light and the second light, respectively; voltage applying means for applying a changeable voltage to the filament; and voltage control means, connected to the voltage applying means, for periodically changing the voltage to be applied to the filament so as to maintain a brightness balance over the first and second display sections.

Claim 8

A fluorescent indicator apparatus comprising: a first display section including a plurality of grids and a plurality of sets of anode segments, each segment having an equal first luminous efficiency for emitting a first light, wherein a plurality of first-type emitting portions are formed by the respective combinations of each grid and each set of the anode segments; grid driving means for periodically driving the grids of the first display section in a predetermined order; anode driving means for driving the anode segments of each set in synchronism with the driving of the grids so that each first-type light-emitting portion sequentially emits the first light; synchronizing control means, connected to the grid driving means, for producing a first synchronizing control signal only while the grid driving means drives a predetermined grid of the first display section, and for producing a second synchronizing control signal only while the grid driving means drives another predetermined grid of the first display section; a second display section including a second-type light-emitting portion which is formed by a grid and an anode segment, and a third-type light-emitting portion which is formed by a grid and an anode segment, wherein the second-type light-emitting portion emits a second light in accordance with a second luminous efficiency which is lower than the first luminous efficiency, and wherein the third-type light-emitting portion emits a third light in accordance with a third luminous efficiency which is substantially equal to the first luminous efficiency; and second display section driving means, connected to the synchronizing control means, for driving the second-type light-emitting portion in synchronism with the first and second synchronizing control signals and for driving the third-type light-emitting portion in synchronism with the second synchronizing control signal so that a brightness of the second display section is substantially equal to that of the first display section.

Claim 9

A fluorescent indicator apparatus comprising: a first display section including a plurality of grids and a plurality of sets of anode segments, each segment having an equal first luminous efficiency for emitting a first light, wherein a plurality of first-type emitting portions are formed by the respective combinations of each grid and each set of the anode segments; grid driving means for periodically driving the grids of the first display section in a predetermined order; anode driving means for driving the anode segments of each set in synchronism with the driving of the grids so that each first-type light-emitting portion sequentially emits the first light; synchronizing control means, connected to the grid driving means, for producing a first synchronizing control signal only while the grid driving means drives a predetermined grid of the first display section, and for producing a second synchronizing control signal only while the grid driving means drives another predetermined grid of the first display section; a second display section including a second-type light-emitting portion which is formed by a grid and an anode segment, and a third-type light-emitting portion which is formed by a grid and an anode segment, wherein the second-type light-emitting portion emits a second light in accordance with a second luminous efficiency which is lower than the first luminous efficiency, and wherein the third-type light-emitting portion emits a third light in accordance with a third luminous efficiency which is substantially equal to the first luminous efficiency; and second display section driving means, connected to the synchronizing control means, for driving the second-type light-emitting portion in synchronism with the first and second synchronizing control signals and for driving the third-type light-emitting portion in synchronism with the second synchronizing control signal so that a brightness of the second display section is substantially equal to that of the first display section.

Claim 10

A fluorescent indicator apparatus according to claim 5, further comprising: a filament for emitting electrons for causing said anode segments of said first-type, second-type, and third-type light-emitting portions to emit the first light, second light and third light, respectively; voltage applying means for applying a changeable voltage to the filament; and voltage control means, connected to the voltage applying means, for periodically changing the voltage to be applied to the filament so as to maintain a brightness balance over the first and second display sections.