DIFFUSED LIGHT PROJECTOR

• US 20090268466A1
• Filed: 04/17/2009
• Published: 10/29/2009
• Est. Priority Date: 04/24/2008
• Status: Active Grant

• Current Assignee: Coemar S.p.A.
• Original Assignee: Coemar S.p.A.
• Inventors: ALLEGRI, Fabio
• Granted Patent: US 8,007,134 B2
• Time in Patent Office: Days
• US Class Current: 362/268
• CPC Class Codes: F21S 10/007 using rotating transparent or colored disks, e.g. gobo wheels
• CPC Class Codes: F21V 14/06 by movement of refractors in vehicle head lamps F21S41/635
• CPC Class Codes: F21V 5/02 of prismatic shape F21V5/04 takes precedence
• CPC Class Codes: F21V 5/048 the lens being a simple lens adapted to cooperate with a point-like source for emitting mainly in one direction and having an axis coincident with the main light transmission direction, e.g. convergent or divergent lenses, plano-concave or plano-convex lenses
• CPC Class Codes: F21W 2131/406 for theatres, stages or film studios

Abstract

Diffused light projector comprising:

• • a light source;
  • a main lens acting on the beam of light coming from the light source, said main lens being a Fresnel lens or a plano-convex lens to diffuse incident beam or beams of light;
  • at least one prismatic lens located between the light source and the main lens to condition the beam of light coming from said light source.

Claims

1. Diffused light projector comprising:

a light source;

a main lens acting on the beam of light coming from the light source, wherein at least one prismatic lens is located between the light source and the main lens to condition the beam of light coming from said light source, said main lens being a Fresnel lens or a plano-convex lens to diffuse incident beam or beams of light.

2. Projector according to claim 1, wherein the projector is also equipped with means for rotating the prismatic lens around an axis longitudinal to said prismatic lens.

3. Projector according to claim 2, wherein the means for rotating the prismatic lens include a toothed wheel connected to the prismatic lens and integral with it and a toothed driving wheel in mesh with said toothed wheel in order to make it rotate.

4. Projector according to claim 3, wherein the projector also includes a pierced plate supporting the prismatic lens and the toothed driving wheel.

5. Projector according to claim 4, wherein the projector includes a plurality of additional prismatic lenses housed in an equal number of additional holes in the pierced plate and connected integrally to an equal number of additional toothed wheels which mesh with the toothed driving wheel, the pierced plate being pivoted rotatably around a shaft connected to the pierced plate itself in such a way that each of the additional prismatic lenses can be set up in place of prismatic lens.

6. Projector according to claim 1, wherein the projector is provided with means for moving the prismatic lens along a route between the light source and the main lens.

7. Projector according to claim 6, wherein the means for moving include a support for carrying the prismatic lens and a guide on which the support is slidably mounted.

8. Projector according to claim 4, wherein the projector includes means for moving the pierced plate along a route between the light source and the main lens.

9. Projector according to claim 8, wherein the means for moving comprise a support for carrying the pierced plate and a guide on which the support is slidably mounted.

10. Projector according to claim 1, defining an optical axis passing through the centre of the light source and the centres of curvature of the main lens and of the prismatic lens in such a way that the beam of light coming from the light source travels substantially in the direction of said optical axis.

11. Projector according to claim 1, including at least one secondary lens located between the light source and the main lens to condition the beam or beams of light.

12. Projector according to claim 1, including an optical element connected to the light source in such a way as to receive and convey the beam of light coming from the light source itself.

13. Projector according to claim 1, wherein the prismatic lens has one or more facets in order to obtain a single beam of light or a plurality of beams of light.

14. Projector according to claim 5, wherein the additional prismatic lenses have one or more facets in order to obtain a single beam of light or a plurality of beams of light.