Device for adjusting light intensity for discharge lamp projectors

• US 20050007560A1
• Filed: 05/27/2004
• Published: 01/13/2005
• Est. Priority Date: 05/30/2003
• Status: Active Grant

• Current Assignee: De Sisti Lighting SpA
• Original Assignee: De Sisti Lighting SpA
• Inventors: De Sisti, Mario, De Sisti, Fabio
• Granted Patent: US 7,322,706 B2
• Time in Patent Office: Days
• US Class Current: 353/85
• CPC Class Codes: F21V 11/10 of iris type
• CPC Class Codes: F21V 14/06 by movement of refractors in vehicle head lamps F21S41/635
• CPC Class Codes: F21V 5/045 the lens having discontinuous faces, e.g. Fresnel lenses
• CPC Class Codes: F21W 2131/406 for theatres, stages or film studios
• CPC Class Codes: H04N 9/315 Modulator illumination systems general applications of lighting devices F21V; general optical systems G02B; lamp houses for projectors not peculiar to the presence of an electronic spatial light modulator G03B21/20

Abstract

The invention relates to a device for adjusting light intensity for discharge lamp projectors comprising an optical assembly (1) comprised of a discharge lamp (3) and a spherical mirror (2), and of a Fresnel lens (4), provided in front of the lamp (3) of said optical assembly (1), characterised in that an iris diaphragm (5) is provided on said optical assembly (1), in front of the lamp (3), in correspondence of the focus of the optical assembly (1).

Claims

1. Device for adjusting light intensity for discharge lamp projectors comprising an optical assembly comprised of a discharge lamp and a spherical mirror, and of a Fresnel lens, provided in front of the lamp of said optical assembly, characterised in that an iris diaphragm is provided on said optical assembly, in front of the lamp, in correspondence of the focus of the optical assembly.

2. Device for adjusting light intensity for discharge lamp projectors according to claim 1, characterised in that said optical assembly is movable along a longitudinal axis between two different foci, respectively a “

flood”

or “

large beam”

point and a “

spot”

or “

narrow beam”

point.

3. Device for adjusting light intensity for discharge lamp projectors according to claim 1, substantially as illustrated and described.

4. Device for adjusting light intensity for discharge lamp projectors

according to claim 2, substantially as illustrated and described.