Flat type discharge lamp and lighting device

Abstract

A front substrate (1) and a rear substrate (2) composed of translucent sheets of glass are disposed to face each other with an almost constant interval, and the peripheral portions of the two sheets of glass are bonded together with frit glass (4) via side walls (3) to form a flat discharge container. Fluorescent substance layers (5a, 5b) are formed on the inner sides of the front substrate (1) and the rear substrate (2) to convert a ultraviolet ray emitted from a discharge medium into a visible light. External electrodes (6) for applying high voltage and external electrodes (7) for applying low voltage are alternately arranged on the outer surface of the rear substrate (2). A plurality of slender spacers (8) are arranged between the front substrate (1) and the rear substrate (2) at constant intervals to keep constant the space between the front substrate (1) and the rear substrate (2) and prevent damage due to lamp implosion to be caused by pressure difference between the inside and outside of the discharge container. A linear spacer (8) is disposed so as to be contained within the maximum width of an external electrode (6), and one electrode (6) is apparently divided into two pieces. One electrode (6) is exposed to respective discharge spaces divided by a linear spacer (8), and is allowed to work as electrodes (10) in respective discharge spaces, whereby it is possible to stably light up respective discharge spaces.

Description

technical field [0001] The invention relates to a flat discharge lamp and a lighting device. Background technique [0002] Recently, with the increase in size of liquid crystal displays, as a fluorescent lamp used as a backlight light source, a flat type discharge lamp in which a discharge space is formed in a flat-shaped sealed glass container has been developed. This type of flat discharge lamp forms a fluorescent film on the inner surface of the glass container, and fills the flat discharge space with a mixture of inert gases such as xenon, neon, and argon, or a mixture of these gases and mercury vapor. composition of the discharge medium. A plurality of strip-shaped discharge electrodes parallel to each other are formed on the upper and lower outer surfaces of the flat glass container. [0003] Given a necessary potential difference between adjacent discharge electrodes formed on the outer surface of the glass container, discharge occurs throughout the entire discharge...

AI Technical Summary

Problems solved by technology

However, if the width of the electrode is narrow, it will be difficult to form a certain electrode width due to clogging of the mesh due to screen plate making when the conductive paste is printed.

Therefore, a disconnection occurs at the narrow portion of the electrode width, which causes a decrease in the quality of the lamp.

In addition, if the length of the electrode increases as the size of the lamp increases, the voltage value applied by the power supply part decreases due to the resistance loss of the electrode as the distance from the power supply part increases, and the voltage at the front end of the lamp becomes insufficient.

As a result, there is also a problem that as the distance from the power supply part decreases, the brightness of the lamp decreases, and uniform light emission cannot be obtained.

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