Flashing lamp and method for adjusting flashing of flashing lamp

1. A flashing lamp comprising:

an LED module serving as a light source;

a light distribution unit;

a housing having an opening; and

a light transmissive cover, wherein

the LED module and the light distribution unit are disposed inside the housing,

the light distribution unit is disposed on a light emission side of the LED module,

the light transmissive cover is disposed over the opening of the housing,

the LED module comprises:

an LED-mounting board;

a plurality of LED rows; and

an adjusting unit that adjusts flashing of the plurality of LED rows on a row-by-row basis,

the plurality of LED rows are mounted on one surface of the LED-mounting board,

each of the plurality of LED rows is a row in which a plurality of LEDs are electrically connected,

the plurality of LED rows are electrically connected to each other on a row-by-row basis, and

when at least one LED row of all the LED rows fails to illuminate, the adjusting unit extends a flashing time of each LED of remaining LED rows to maintain a luminous intensity of the entire plurality of LED rows within a predetermined range.

2. The flashing lamp according to claim 1 , wherein

the adjusting unit comprises a determining unit, and

the determining unit determines an extended flashing time (Te) of each LED of the remaining LED rows based on equation (1) below

Te =( T 0× L 0)/( L 0− Le×C )  (1)

T0: flashing time of LED before extension

L0: number of all LED rows

Le: number of non-illuminated LED rows out of all LED rows

C: correction factor.

3. The flashing lamp according to claim 1 , wherein

the adjusting unit comprises a light-off unit, and

the light-off unit turns off the flashing lamp when a ratio of the number of non-illuminated LED rows to the number of all the LED rows exceeds a predetermined value.

4. The flashing lamp according to claim 1 , wherein

the flashing lamp is for aircraft landing guidance.

5. A method for adjusting flashing of a flashing lamp provided with a plurality of LED rows, comprising the steps of:

flashing the plurality of LED rows; and

adjusting flashing of the plurality of LED rows on a row-by-row basis, wherein each of the plurality of LED rows is a row in which a plurality of LEDs are electrically connected,

the plurality of LED rows are electrically connected to each other on a row-by-row basis, and

in the adjusting step, when at least one LED row of all the LED rows fails to illuminate, a flashing time of each LED of remaining LED rows is extended to maintain a luminous intensity of the entire plurality of LED rows within a predetermined range.

6. The method according to claim 5 , wherein

the adjusting step comprises a determining step, and

in the determining step, an extended flashing time (Te) of each LED of the remaining LED rows is determined based on equation (1) below

Te =( T 0× L 0)/( L 0− Le×C )  (1)

T0: flashing time of LED before extension

L0: number of all LED rows

Le: number of non-illuminated LED rows out of all LED rows

C: correction factor.

7. The method according to claim 5 , wherein

the adjusting step comprises a light-off step, and

in the light-off step, the flashing lamp is turned off when a ratio of the number of non-illuminated LED rows to the number of all the LED rows exceeds a predetermined value.

8. The method according to claim 5 , wherein

the flashing lamp is for aircraft landing guidance.