| (19) |
 |
|
(11) |
EP 0 403 211 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
10.07.1991 Bulletin 1991/28 |
| (43) |
Date of publication A2: |
|
19.12.1990 Bulletin 1990/51 |
| (22) |
Date of filing: 11.06.1990 |
|
|
| (84) |
Designated Contracting States: |
|
AT BE CH DE DK ES FR GB GR IT LI LU NL SE |
| (30) |
Priority: |
15.06.1989 GB 8913798
|
| (71) |
Applicant: THORN EMI plc |
|
London W1A 2AY (GB) |
|
| (72) |
Inventors: |
|
- Hick, Kevin
Syston,
Leicester (GB)
- Preston, Barry
Leicester (GB)
- Rambaldini, Bruce Haywood Sharpe
Syston,
Leicester LE7 8PX (GB)
|
| (74) |
Representative: Matthews, Graham Farrah et al |
|
BROOKES & MARTIN
Incorporating
MATTHEWS, HADDAN & CO.
High Holborn House
52/54, High Holborn
London, WC1V 6SE
London, WC1V 6SE (GB) |
|
| |
|
| (54) |
Arc tube for a high pressure discharge lamp |
(57) An arc tube (12, 46, 48), provided for a high pressure discharge lamp, includes a
discharge chamber (24) containing a fill. Electrical conductors (26, 28) extend into
the discharge chamber (24) to form electrodes (32, 34). The electrical conductors
(26, 28) are sealed in the arc tube (12, 46, 48) by a single pinch seal portion (30).
At the interface (44) of the discharge chamber (24) and the pinch seal portion (30),
the discharge chamber has at least in part a non-concave outline. This outline may
be rectilinear or convex.