Global Patent Index - EP 0077077 A3

EP 0077077 A3 19831116 - PANEL-SHAPED LOW-PRESSURE MERCURY VAPOUR DISCHARGE LAMP

Title (en)

PANEL-SHAPED LOW-PRESSURE MERCURY VAPOUR DISCHARGE LAMP

Publication

EP 0077077 A3 19831116 (DE)

Application

EP 82109470 A 19821013

Priority

DE 3140839 A 19811014

Abstract (en)

[origin: EP0077077A2] A compact panel-shaped low-pressure mercury vapour discharge lamp is provided which is suitable for directional illumination in the domestic and working environment. The discharge vessel consists of a shell-shaped upper part (1) having a central socket (7) and a flat closing plate (2), both parts being produced from pressed glass. A wound discharge path (9), which runs in a plane perpendicular to the emission direction, is formed in the upper part (1) by two or more annular separating walls (4a) and a straight separating wall (4b). By appropriate forming and design of the two vessel parts (1, 2), it is achieved that at leat 80% of the generated light flux is emitted via the flat closing plate (2). In one advantageous embodiment, the shell-shaped upper part (1) is provided on its inner side (10) with a relatively thick coating (11) of fluorescent material (more than 6 mg/cm<2>). In the case of a thinner coating thickness of the fluorescent material, an additional reflection coating is applied. The closing plate (2) has a protective coating on its side facing the discharge, if required in conjunction with a thin coating of fluorescent material (1 to 3 mg/cm<2>). <IMAGE>

IPC 1-7

H01J 61/30

IPC 8 full level

H01J 61/30 (2006.01)

CPC (source: EP)

H01J 61/30 (2013.01)

Citation (search report)

Designated contracting state (EPC)

DE FR GB IT

DOCDB simple family (publication)

EP 0077077 A2 19830420; EP 0077077 A3 19831116; DE 3140839 A1 19830421; JP S5875759 A 19830507

DOCDB simple family (application)

EP 82109470 A 19821013; DE 3140839 A 19811014; JP 17770282 A 19821012