Lamp protection arrangement

Claim 1

A light bulb protection arrangement including a light bulb having a central terminal and a peripheral terminal, a socket having a central terminal and a peripheral terminal, and a junction socket, said junction socket comprising: a case provided with a base portion and a socket portion, said base portion being screwed into said socket and a base of said light bulb being screwed into said socket portion; a connecting terminal which extends outside said base portion and inside said socket portion; a first terminal which is brought into contact with said central terminal of said socket when said base portion has been screwed into said socket; a second terminal which is brought into contact with said central terminal of said light bulb when said base of said light bulb has been screwed into said socket portion; and a negative temperature coefficient thermistor having first and second electrodes electrically connected to said first terminal and said second terminal, respectively; said first terminal, said second terminal and said negative temperature coefficient termistor being provided in said base portion, said thermistor being housed in a space in said base portion of said case, one end of said second terminal being located in said space and being elastically biased into contact with said second electrode whereby when said light bulb is attached to said socket through said junction socket, said peripheral terminal of said light bulb and said peripheral terminal of said socket are connected to said connecting terminal with said central terminal of said socket being connected to said central terminal of said light bulb through said first terminal, said negative temperature coefficient thermistor and said second terminal.