Fluorescent light fixture

• US 6,092,913 A
• Filed: 03/26/1998
• Issued: 07/25/2000
• Est. Priority Date: 03/26/1998
• Status: Expired due to Term

• Current Assignee: Renova Lighting Systems, Inc.
• Original Assignee: Renova Technologies, LLC
• Inventors: Edwards, Richard D. Jr.
• Primary Examiner(s): O'Shea, Sandra
• Assistant Examiner(s): Sawhney, Hargobind S.
• Application Number:
  US09/048,554
• Time in Patent Office: 852 Days
• Field of Search: 362/147, 362/148, 362/346, 362/347, 362/225, 362/260
• US Class Current: 362/260
• CPC Class Codes: F21S 8/02 of recess-mounted type, e.g. downlighters specially adapted for vehicle exteriors F21S41/00-F21S45/00
• CPC Class Codes: F21S 8/026 intended to be recessed in a ceiling or like overhead structure, e.g. suspended ceiling
• CPC Class Codes: F21V 19/02 with provision for adjustment, e.g. for focusing
• CPC Class Codes: F21V 7/005 with an elongated shape to cooperate with linear light sources
• CPC Class Codes: F21V 7/09 with a combination of different curvatures
• CPC Class Codes: F21V 7/16 with provision for adjusting the curvature
• CPC Class Codes: F21Y 2103/00 Elongate light sources, e.g. fluorescent tubes
• CPC Class Codes: F21Y 2113/00 Combination of light sources

Abstract

A fluorescent fixture having high efficiency and a low profile is provided. The fixture includes a housing having a central well with a pair of tubular fluorescent bulbs mounted therein and extending in a lengthwise direction. Each bulb is surrounded by a double-trough specular reflector with a local peak that extends from the base of the well, toward the bulb. The local peak is positioned generally along a centerline through the bulb. A pair of maximum trough bottoms are positioned on each of opposing sides of the centerline. The reflector configuration reflects a substantial amount of incident light away from the bulb surface and out from the fixture opening where it is needed. The housing includes a pair of sloped outer sides that extend in a widthwise direction away from the reflector outwardly to opposing widthwise edges of the housing to enable light reflected from the reflector to be transmitted toward the widthwise edges of the housing free of obstruction thereto. The fluorescent bulbs can be mounted on brackets that move in a widthwise direction and the reflector is attached to the brackets to flexibly move in response to widthwise movement of the brackets.

Claims

1. A fluorescent light fixture comprising:

a housing defining a main well having a lengthwise direction and a widthwise direction;

at least two fluorescent bulbs extending in the lengthwise direction between a pair of mounting brackets located adjacent side panels that extend in the widthwise direction;

a specular reflector defining a pair of parallel double-trough reflector shapes, each of the shapes with a local peak extending toward a respective one of the bulbs and a pair of remote maximum trough bottoms extending away from the respective one of the bulbs adjacent the local peak and on each of opposing sides of the local peak and each of the double-trough reflector shapes having trough walls that extend further away from the maximum trough bottoms and around the respective one of the bulbs and that extend in a widthwise direction away from the respective one of the bulbs outwardly from each other, the reflector including a main central peak between each of the two bulbs that isolates each of the two bulbs optically from each other;

wherein each of the double-trough reflector shapes is constructed and arranged so that substantially all light exiting from the surface of the respective one of the bulbs is reflected away from the respective one of the bulbs and outwardly through and opening in the housing; and

a pair of sloped outer sides that extend in the widthwise direction away from the reflector, the sloped outer sides having wall sections that are positioned at an angle so that light transmitted directly from each of the bulbs is directed free of obstruction to outermost widthwise edges of the fixture, and the fixture including a diffuser grate located over substantially the entire opening of the fixture.

2. The fixture as set forth in claim 1 wherein the outermost widthwise edges of the fixture are located adjacent a corner defined between the walls of the outer sides of the housing and wherein the widthwise ends of the reflectors being more remote from the grate than the central peak.

3. The fixture as set forth in claim 1 wherein the housing and the reflector, adjacent the central peak, defines a cavity and wherein a ballast is located in the cavity.

4. The fixture as set forth in claim 1 further comprising adjustable brackets for mounting each of the bulbs, including a plurality of mounting locations arranged in a widthwise direction along the housing whereby the location of the bulbs with respect to the housing and to the reflector is variable.

5. The fixture as set forth in claim 4 wherein the reflector is flexible and is constructed and arranged to flex into a predetermined orientation in response to an applied pressure thereto, whereby the local peaks can be moved to remain adjacent to each respective bulb as the adjustable brackets are moved in the widthwise direction.

6. The fixture as set forth in claim 1 wherein the housing further defines an outline taken through a cross section in the widthwise direction having a central cavity with a first depth, the reflector being seated in a base of the cavity, opposite an opening in the cavity, and a pair of sloped side walls extending from points on the central cavity remote from and suspended above the base and sloping outwardly from the central cavity toward outermost widthwise edges of the housing, the reflector having outer widthwise edges that are located approximately at the points.

7. The fixture as set forth in claim 1 wherein at least a portion of the reflector includes a surface that comprises a plurality of surface segments that are each planar and are joined to each other and thereby define a segmented continuous trough surface.