Projector with enhanced security camcorder defeat

• US 7,221,759 B2
• Filed: 03/27/2003
• Issued: 05/22/2007
• Est. Priority Date: 03/27/2003
• Status: Expired due to Fees

• Current Assignee: Eastman Kodak Company
• Original Assignee: Eastman Kodak Company
• Inventors: Nelson, David J.
• Primary Examiner(s): Moazzami; Nasser
• Assistant Examiner(s): Okoronkwo; Chinwendu C.
• Application Number:
  US10/401,208
• Publication Number:
  US 20040190716A1
• Time in Patent Office: 1,517 Days
• Field of Search: None
• US Class Current: 380/54
• CPC Class Codes: H04N 2005/91314 the copy protection signal being a pulse signal inserted in blanking intervals of the video signal, e.g. pseudo-AGC pulses, pseudo-sync pulses
• CPC Class Codes: H04N 2005/91335 the copy protection signal being a watermark
• CPC Class Codes: H04N 2005/91342 the copy protection signal being an authentication signal
• CPC Class Codes: H04N 2005/91371 the video color burst signal being modified
• CPC Class Codes: H04N 2005/91392 using means for preventing making copies of projected video images
• CPC Class Codes: H04N 5/74 Projection arrangements for image reproduction, e.g. using eidophor
• CPC Class Codes: H04N 5/913 for scrambling ; for copy protection
• CPC Class Codes: H04N 9/31 Projection devices for colour picture display , e.g. using electronic spatial light modulators [ESLM]

Abstract

A projector (10) with enhanced security camcorder defeat including a copy protection illumination system (1) for illuminating a spatial light modulator (30) comprises: a polychromatic light source (20); uniformizing optics (22) for homogenizing light from the polychromatic light source to provide a uniform illumination field; relay optics; dichroic optics; an interference modulation element (5) located at a plane in an optical path located between the polychromatic light source and the spatial light modulator; and a detection means for determining the absence of the interference modulation element.

Claims

1. A projector with enhanced security camcorder defeat including a copy protection illumination system for illuminating a spatial light modulator comprising:

(a) a polychromatic light source;

(b) uniformizing optics for homogenizing light from said polychromatic light source to provide a uniform illumination field;

(c) relay optics;

(d) dichroic optics;

(e) an interference modulation element located at a plane in an optical path located between said polychromatic light source and said spatial light modulator; and

(f) a detection means for determining the absence of said interference modulation element.

2. A projector with enhanced security camcorder defeat as in claim 1 wherein said absence of said interference modulation element triggers a response.

3. A projector with enhanced security camcorder defeat as in claim 2 wherein said response prevents operation of said projector.

4. A projector with enhanced security camcorder defeat as in claim 2 wherein said response is an audible or visible alarm.

5. A projector with enhanced security camcorder defeat as in claim 2 wherein said response is a signal to a third party.

6. A copy protection security system as in claim 1 wherein said detection means is an interlock switch.

7. A copy protection security system as in claim 6 wherein said interlock switch is an electronic interlock.

8. A projector with enhanced security camcorder defeat including a copy protection imaging system comprising:

(a) a spatial light modulator;

(b) image relay optics;

(c) a dichroic combiner;

(d) a projection lens;

(e) an interference modulation element located at a plane in an optical path located between said spatial light modulator and said projection lens, or at a plane in the optical path within said projection lens; and

(f) a detector for determining an absence of said interference modulation element.

9. A projector with enhanced security camcorder defeat as in claim 8 wherein said absence of said interference modulation element triggers a response.

10. A projector with enhanced security camcorder defeat as in claim 9 wherein said response prevents operation of said projector.

11. A projector with enhanced security camcorder defeat as in claim 9 wherein said response is an audible or visible alarm.

12. A projector with enhanced security camcorder defeat as in claim 9 wherein said response is a signal to a third party.

13. A copy protection security system as in claim 8 wherein said detector is an interlock switch.

14. A copy protection security system as in claim 13 wherein said interlock switch is an electronic interlock.

15. A projector with enhanced security camcorder defeat for projecting a multicolor image onto a display surface comprising:

(a) a polychromatic light source;

(b) uniformizing means for homogenizing light from said polychromatic light source to provide a uniform illumination field;

(c) condenser relay optics for directing said uniform illumination field toward a dichroic separator, said dichroic separator providing colored light for a first, second, and third colored channel;

(d) wherein each colored channel is similarly constructed and comprises;

(i) an illumination relay lens for imaging and directing said colored light in said colored channel towards;

(ii) a spatial light modulator for forming a first image thereon; and

(iii) an image relay lens for focusing and relaying a real image of said first image towards a dichroic combiner;

(e) said dichroic combiner forming a multicolor image by combining said real image from said first colored channel, said real image from said second colored channel, and said real image from said third colored channel;

(f) a projection lens for projecting said multicolor image toward said display surface;

(g) an interference modulation element located at a plane in an optical path located between said polychromatic light source and said projection lens, or at a plane in the optical path within said projection lens; and

(h) a detector for determining the absence of said interference modulation element.

16. A projector with enhanced security camcorder defeat as in claim 15 wherein absence of said interference modulation element triggers a response.

17. A projector with enhanced security camcorder defeat as in claim 16 wherein said response prevents operation of said projector.

18. A projector with enhanced security camcorder defeat as in claim 16 wherein said response is an audible or visible alarm.

19. A projector with enhanced security camcorder defeat as in claim 16 wherein said response is a signal to a third party.

20. A copy protection security system as in claim 15 wherein said detector is an interlock switch.

21. A copy protection security system as in claim 20 wherein said interlock switch is an electronic interlock.