Illuminating device with light emitting diodes (led), method of illumination and method for image recording with said led illumination device

• US 20030107887A1
• Filed: 12/27/2002
• Published: 06/12/2003
• Est. Priority Date: 06/27/2000
• Status: Active Grant

• Current Assignee: Arnold & Richter Cine Technik GmbH & Co., Betriebs KG (Stahl Beteiligungs- GmbH)
• Original Assignee: Arnold & Richter Cine Technik GmbH & Co., Betriebs KG (Stahl Beteiligungs- GmbH)
• Inventors: Eberl, Heinrich Alexander
• Granted Patent: US 6,909,377 B2
• Time in Patent Office: Days
• US Class Current: 362/227
• CPC Class Codes: H01L 25/167 comprising optoelectronic devices, e.g. LED, photodiodes
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/0002 Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
• CPC Class Codes: H05B 45/22 using optical feedback
• CPC Class Codes: H05B 47/175 by remote control

Abstract

Illumination device (1) with light emitting diodes (LED) and an LED support element (10) on which a number of light pixels (11, 11′) are arranged which emit light. Said light pixels (11′) each comprise a number of LEDs with emission wavelengths suitable for additive colour mixing of the light from the light pixels (11′). A controller (5) is provided on the LED support element (10), by means of which a colour temperature and intensity parameter of the additively colour mixed light of each individual light pixel (11′) may be set. The controller assigns electrical LED currents to the colour temperature and intensity parameters and controls the LEDs in the light pixels (11′) by means of the assigned LED currents. Control devices (2) measure the colour temperature and intensity of the emitted light of at least one light pixel (11′), compare the measured and the pre-set colour temperature and intensity parameters of the light pixel (11′) and in the case of a difference in the measured and pre-set colour temperature and intensity parameters regulates the controller (5) such that the emitted light from the light pixel (11′) has the pre-set colour temperature and intensity parameters.

Claims

1. Illumination device with light emitting diodes (LEDs) with

an LED support element, on which a large number of light pixels that emit light are arranged, whereby the light pixels include in each case a plurality of LEDs that have different emission wavelengths suitable for the additive color mixing of the light of the light pixels, and

a controller associated with the LED support element, with which a color temperature parameter and an intensity parameter can be pre-set for the additively color mixed light of each individual light pixel, whereby the controller assigns the electrical LED currents corresponding to the pre-set color temperature and intensity parameters and controls the LEDs of the light pixels with the LED currents assigned,

characterized in

that the illumination device (1) has regulation means (2) that measure the color temperature and intensity of the emitted light of at least one light pixel (11′

) of the LED support element (10), compare the measured color temperature and intensity parameters with the pre-set color temperature and intensity parameters of the light pixels (11′

), and, in the event of deviations of the measured color temperature and/or intensity parameters from the pre-set color temperature and intensity parameters, stabilize the emitted light of the light pixel (11′

) by means of the controller (5) such that the emitted light of the light pixel (11′

) has the pre-set color temperature and intensity parameters.

2. Illumination device according to claim 1, characterized in that the regulation means (2) include a semiconductor sensor unit (20) for the light emitted by the light pixels (11) and a microprocessor-controlled comparison and regulating unit (21) associated with the semiconductor sensor unit (20).

3. Illumination device according to claim 2, characterized in that at least one light guide (25) is arranged on the LED support element (10), which light guide guides the emitted light of at least one light pixel (11′

) to the semiconductor sensor unit (20) arranged at a distance from the LED support element (10).

4. Illumination device according to claim 3, characterized in that the light guide (25) is arranged in a loop or ring shape on the LED support element (10) such that portions of the light emitted by all light pixels (11) are coupled into the light guide (25).

5. Illumination device according to claim 4, characterized in that the light guide (25) is designed as a glass or plastic fiber and is shaped in the region of the LED support element (10) such that only light that strikes the light guide (25) from the direction of the light pixels (11) is coupled into it.

6. Illumination device according to one of the preceding claims, characterized in that the controller (5) controls the individual LEDs of the light pixels (11) with current pulses that are timed in the MHz range.

7. Illumination device according to one of the preceding claims, characterized in that the LED support element (10) is arranged in a spotlight housing (12).

8. Illumination device according to claim 7, characterized in that a section of the light guide (25) runs out in the spotlight housing (12) substantially parallel to the LED support element (10) and that this section of the light guide (25) is designed such that light of the light pixels (11) can be coupled into the light guide (25).

9. Illumination device according to claim 8, characterized in that the section of the light guide (25) is arranged in a throat-like shaped section (13) of the spotlight housing (12) and that the opening direction of the throat-like shaped section (13) is aimed at the LED support element (10) such that no ambient light falling directly into the spotlight housing (12) can be coupled into the light guide (25).

10. Illumination device according to claim 9, characterized in that a viewing camera (27) is associated with the spotlight housing (12) and the controller (5), which camera images a scene illuminated with the illumination device (1), and that the viewing camera (27) is fixedly attached to the spotlight housing (12), either inside or outside it.

11. Illumination device according to claim 10, characterized in that the viewing camera (12) is designed as a CCD or CMOS camera.

12. Illumination device according to one of the preceding claims, characterized in that the controller (5) has a screen (52) and data input means (51).

13. Illumination method with an illumination device according to one of the previous claims, characterized in

that the color and intensity parameters of the light emitted by the individual light pixels (11) are controlled such that two-dimensional color progression profiles and/or intensity profiles of the light of conventional incandescent spotlights can be simulated by means of the light pixels (11) of the LED support element (10).

14. Method for illumination of a scene with an illumination device according to claim 12, characterized by the following process steps:

display of the scene to be illuminated imaged by the viewing camera (27) on the screen (52) of the controller (5),

pre-setting of desired illumination conditions of the scene to be illuminated via data input means (51) of the controller (5),

determination and control of one of the color progression and intensity profiles of the light emitted by the LED support element (10) corresponding to the desired illumination conditions by means of the controller (5),

display and evaluation of the image of the illuminated scene recorded with the viewing camera (27) by means of the controller (5),

execution of a correction of the two-dimensional color progression and intensity profiles of the light emitted by the LED support element (10) by means of the controller (5) until the scene illuminated has the desired illumination relationships.

15. Method for recording images of a movement of at least one body in front of a background, with

an illumination device according to one of claims 1 through 12 to provide illumination light for the illumination of the body and

a camera that records the images of the movement of the body in front of the background,

whereby the camera is stationary relative to the background during the recording of the images,

characterized in

that during or between the recording of the images color temperature and/or intensity of the illumination light of the illumination device (1) is changed.

16. Method according to claim 15, whereby the movement of the body is recorded during a recording period between a starting time point and an end time point, characterized in that the illumination light has a beginning color temperature in the violet spectral range at the starting time point and an ending color temperature in the red spectral range at the end time point, and has a large number of color temperatures between the red and violet spectral range of the color spectrum during the recording period.

17. Method according to claim 15, whereby the movement of the body is recorded during a recording period between a starting time point and an end time point, characterized in that the illumination light has a beginning color temperature in the red spectral range at the starting time point, an ending color temperature in the violet spectral range at the end time point, and a large number of color temperatures between the red and violet spectral range of the color spectrum during the recording period.

18. Method according to claim 16 or 17, characterized in that the color temperature of the illumination light is changed stepwise or continuously between the starting time point and the end time point of the recording of the images from the beginning color temperature to the ending color temperature.

19. Method according to claim 18, characterized in that the color temperature of the illumination light is changed in proportion to the recording time.

20. Method according to one of claims 15 through 19, whereby the body carries out a temporally and spatially periodic movement with a periodicity time T, characterized in that the recording time between the starting time point and the end time point corresponds to one-half the periodicity time T/2.

21. Method according to one of claims 15 through 20, characterized in that a video, CCD, or CMOS camera is used as the camera.

22. Method according to claim 21, characterized in that a large number of individual images that were recorded during the recording period are presented overlapped in a single image using digital image processing means.