Patent ID: 7679289

Claim:
A flat-type fluorescent lamp comprising: a front glass substrate in shape of rectangle, provided with a plurality of rows of U-shaped grooves formed in predetermined portions except the periphery of the front glass substrate and a portion for forming members including cylindrical electrodes, and a fluorescent substance coating film formed on the inner surface of the front glass substrate except the periphery, wherein the predetermined portions are located in a central portion of the front glass substrate; a rear glass substrate in shape of rectangle, provided with a plurality of rows of wavy parallel grooves formed in predetermined portions except the periphery of the rear glass substrate and a portion for forming members including the cylindrical electrodes, and a fluorescent substance coating film formed on the inner surface of the rear glass substrate except the periphery, wherein the predetermined portions are located in a central portion of the rear glass substrate; and wherein the peripheries of the front and rear glass substrates are welded together, with a glass frame inserted therebetween, to form a sealed body, wherein the glass frame has an exhaust pipe, and wherein the glass substrates are coupled in state where the U-shaped grooves are perpendicular to the wavy parallel grooves, and wherein the U-shaped grooves and the wavy parallel grooves are in contact with each other by interposing the fluorescent substance coating films, wherein, on providing the sealed body in state of positioning the U-shaped grooves in horizontal, the exhaust pipe is sealed to the upper side of the glass frame, a plurality of lamp connectors being welded to a plurality of groups of cylindrical electrodes are sealed to the lateral side of the glass frame, each of the lamp connectors inserted to a tunnel-shaped cavity formed between the rows of the U-shaped grooves, and one or a plurality of groups of heater connectors are provided in the lower side of the glass frame, the heater connectors being connected with a heater wire, wherein the depth of the U-shaped grooves is greater than a depth of the wavy grooves.