Retractable lighting fixture

Patent metadata

Field	Value
Publication number	US-9803843-B2
Application number	US-201414281946-A
Country	US
Kind code	B2
Filing date	May 20, 2014
Priority date	Aug 10, 2011
Publication date	Oct 31, 2017
Grant date	Oct 31, 2017

Abstract

Disclosed is a retractable lighting fixture having a retractable LED lighting layer. One or more optical layers ( 40, 240 A/B, 340 A/B, 440 ) may optionally be provided over the LED lighting layer ( 30, 230, 330, 430 ). The optical layer(s) and the LED lighting layer may optionally be movable relative to one another between at least being in an expanded spaced relation to one another and a compressed relation to one another. One or more LEDs ( 34, 134, 234 A/B, 334 A/B, 434 ) on the LED lighting layer may be individually controllable and such LEDs ( 34, 134, 234 A/B, 334 A/B, 434 ) may be selectively extinguished when they are in a retracted position.

First claim

The invention claimed is:

1. A retractable lighting fixture, comprising:
a housing;
a flexible LED lighting sheet retractably retainable within said housing, said LED lighting sheet movable between a retracted position at least partially retracted within said lighting fixture housing and an extended position protracted from said lighting fixture housing more than said retracted position; said LED lighting sheet having a plurality of LEDs selectively electrically connected to a power supply;
a plurality of electrical switches, each of said switches electrically interposed between at least one of said LEDs and said power supply; said switches actuable between at least a first state and a second state;
wherein in said first state each of said switches enables electrical interconnectivity between said power supply and LEDs associated therewith;
wherein in said second state each of said switches prevents electrical interconnectivity between said power supply and LEDs associated therewith;
wherein each of said switches is in said first state when LEDs associated therewith are protracted from said lighting fixture housing;
wherein each of said switches is in said second state when LEDs associated therewith are retracted within said lighting fixture housing; and wherein each of said switches is configured such that an initial protraction out of said lighting fixture housing of one or more LEDs associated with the respective switch prompts the respective switch to enter said first state.

2. The retractable lighting fixture of claim 1 , wherein said first state of said switches is an open state.

3. The retractable lighting fixture of claim 1 , wherein said first state of said switches is a closed state.

4. The retractable lighting fixture of claim 3 , wherein said power supply is a current limiting power supply.

5. The retractable lighting fixture of claim 1 , further comprising a controller in electrical communication with said switches and individually directing said switches between said first state and said second state.

6. The retractable lighting fixture of claim 5 , further comprising at least one sensor in electrical communication with said controller, said sensor sensing the position of said LED lighting sheet.

7. The retractable lighting fixture of claim 6 , wherein said sensor includes a hall effect sensor.

8. The retractable lighting fixture of claim 7 , wherein the lighting fixture further comprises a mandrel within said retracted lighting fixture housing, said LED lighting sheet coupled to said mandrel and rotated therearound in said retracted position, wherein said hall effect sensor senses revolutions of said mandrel.

9. The retractable lighting fixture of claim 6 , wherein said sensor includes a plurality of photo sensors coupled to said LED lighting sheet.

10. The retractable lighting fixture of claim 1 , wherein at least some of said switches each include structure moving a respective of said switches into said first state when LEDs associated therewith are protracted from said lighting fixture housing and into said second state when LEDs associated therewith are retracted within said lighting fixture housing.

11. A method of selectively actuating LEDs as they are retracted into and protracted out of a retractable lighting fixture housing, comprising:
electronically determining which of a plurality of LED groupings on a LED lighting sheet are in a retracted position substantially within a retractable lighting fixture housing;
electronically determining which of said plurality of LED groupings on said LED lighting sheet are in an extended position substantially outside said retractable lighting fixture housing;
electronically extinguishing said LED groupings determined to be in said retracted position;
electronically illuminating said LED groupings determined to be in said extended position; and wherein said LED groupings determined to be in said protracted position are first groupings, wherein the electrically illuminating comprises electrically illuminating the first groupings, and wherein an initial protraction out of said lighting fixture housing of said first groupings prompts the electronically illuminating the first groupings.

12. A retractable lighting fixture, comprising:
a lighting fixture housing;
a flexible multilayer lighting sheet retractably retainable within said lighting fixture housing, said multilayer lighting sheet movable between a retracted position at least partially retracted within said lighting fixture housing and an extended position more protracted from said lighting fixture housing than said retracted position; said multilayer lighting sheet having a LED layer and an optical layer at least selectively over said LED layer, said LED layer including a plurality of LEDs selectively generating a light output, said optical layer intersecting and transmitting at least some of said light output;
wherein portions of said LED layer and said optical layer are in an unrolled state when in said extended position and in a rolled state when in said retracted position,
wherein said LED layer and said optical layer are rolled separately from one another when in said retracted position; and wherein said LED layer and said optical layer are rolled separately from one another into separate rolls when in said retracted position.

13. The retractable lighting fixture of claim 12 , wherein the distance between said LED layer and said optical layer in said extended position is greater than the distance between said LED layer and said optical layer in said retracted position.

14. The retractable lighting fixture of claim 12 , further comprising a mandrel within said retracted lighting fixture housing, said LED layer coupled to said mandrel and rotated therearound in said retracted position.

15. The retractable lighting fixture of claim 14 , further comprising a second mandrel within said retracted lighting fixture housing, said optical layer coupled to said second mandrel and rotated therearound in said retracted position, wherein said mandrel and said second mandrel are movable relative to one another.

16. A retractable lighting fixture, comprising:
a lighting fixture housing;
a flexible multilayer lighting sheet retractably retainable within said lighting fixture housing, said multilayer lighting sheet movable between a retracted position at least partially retracted within said lighting fixture housing and an extended position more protracted from said lighting fixture housing than said retracted position, said multilayer lighting sheet having a LED layer and an optical layer at least selectively over said LED layer, said LED layer including a plurality of LEDs selectively generating a light output, said optical layer intersecting and transmitting at least some of said light output;
wherein portions of said LED layer and said optical layer are in an expanded unrolled state when in said extended position and in a compressed rolled state when in said retracted position, wherein said multilayer lighting sheet includes a second optical layer over the LED layer, said second optical layer on an opposite side of said LED layer than said optical layer and wherein said LED layer, said optical layer, and said second optical layer are all rolled separately from one another when in said retracted position.

17. A retractable lighting fixture, comprising:
a lighting fixture housing;
a flexible multilayer lighting sheet retractably retainable within said lighting fixture housing, said multilayer lighting sheet movable between a retracted position at least partially re

Assignees

• Philips Lighting Holding Bv

Inventors

• Engelen Dirk Valentinus René
• Bergman Anthonie Hendrik
• Dekker Tim
• Knaapen Bram
• Van De Sluis Bartel Marinus
• Van Gheluwe Jochen Renaat

Classifications

• F21V9/30

  Elements containing photoluminescent material distinct from or spaced from the light source (shades F21V1/17; globes, bowls or cover glasses F21V3/08, F21V3/12; refractors F21V5/10; reflectors F21V7/26, F21V7/30; elements with provision for controlling the spectral properties or intensity F21V9/40) · CPC title

• F21V9/45

  by adjustment of photoluminescent elements · CPC title

• F21V13/08

  the elements being filters or photoluminescent elements and reflectors · CPC title

• F21V5/02

  of prismatic shape (F21V5/04 takes precedence) · CPC title

• F21V21/14

  Adjustable mountings · CPC title