Patent ID: 8013507

Claim:
A cold cathode fluorescent lamp comprising: a light transmitting glass tube in which a rare gas and mercury are sealed; a pair of cold cathodes which is arranged in both end portions of the glass tube in a sealed manner in a state that the cold cathodes face each other in an opposed manner; a pair of power lead lines each of which has one end thereof connected to the cold cathode and another end thereof led out to the outside of the glass tube in a hermetically sealed manner; and a phosphor layer which is formed on an inner surface of the glass tube, wherein the phosphor layer is constituted of a plurality of phosphor particles and a bonding agent, the bonding agent is made of aluminum oxide and boron oxide, and the plurality of phosphor particles are bonded to the inner surface of the glass tube in a state that the plurality of phosphor particles are covered with the bonding agent by coating, and a ratio of boron oxide in the bonding agent is set to a value which falls within a range from 6 wt % to 10 wt % of a total amount of aluminum oxide and boron oxide.