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US 7,352,119 B2Granted
Method for designing a discharge lamp
AssigneePatent-Treuhand-Gesellschaft fur elektrische Gluhlampen mbH
InventorHenning Rehn
Life of this patent
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Abstract
The invention relates to a method for designing a discharge lamp for use with a light-gathering system, in particular of a projector for data or video projection. Also disclosed are a lamp designed using such a method and a reflector provided therefore.
Claims4
A projector lamp assembly comprising:
- a double ended high intensity arc discharge lamp burner having an axis and a body defining a vessel with an enclosed volume and an axially aligned first electrode and second electrode each electrode having an internal tip, the first electrode tip and second electrode tip having a separation distance of g and having a midpoint axially between the tips and an axial distance from the midpoint to an end of the body of L;
- an reflector having a reflective surface in the form of a portion of an ellipsoid of revolution with an eccentricity of e0, a major semiaxis distance of a, a minor semiaxis of b, a first focal point F1 and a second focal point F2, the first focal point F1 and the second focal point F2 being axially aligned with the lamp with the first focal point F1 being positioned at the midpoint of the lamp;
- and an optical transmission structure having an optical input positioned relative to the reflector to locate the input at the second focal point F2, the optical transmission structure having an etendue of E and an acceptance angle of γ′;
- wherein
- e0=ea(γ′)−Δe(γ′,E,g) equation 3
- e
- a
- =
- 2
- +
- 1
- -
- tan
-
-
- γ
- ′
- 2
- 2
- +
- 1
- +
- tan
-
-
- γ
- ′
- 2
- equation
-
-
- 1
- and
- Δ
-
-
- e
- =
- 1.3
-
-
- sin
-
-
- 2
-
-
- γ
- ′
-
-
- exp
- (
- -
- 2
-
- E
- 0.17
- g
- )
- .
- equation
-
-
- 2
62 more elements
Dependencies are inferred from the claim text.