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US4539628A Expired / Lapsed US ⏱️ 0.0 years remaining

Nonglare light fixtures for a rod-shaped light source

Assignee: Individual
•
Filing: 1984-04-02
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Granted: 1985-09-03
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Expires: 2004-04-02
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Abstract

Abstract Light fixtures with a rod-shaped light source (1) and with concave reflectors on both longitudinal sides of the light source. The concave reflectors extend above the light source, and have a curvature such that all light rays reflected across the light source will emerge in the transverse direction either directly or after reflection at an angle that is steeper than a light-specific masking angle (α). The reflectors include lamellae (4) that have an approximately V-shaped cross section and run across the middle vertical longitudinal plane of the light source and have reflecting concave side surfaces with a curvature such that all light rays reflected in the longitudinal direction of the light source (1) will emerge in the longitudinal direction either directly or after reflection at an angle that is steeper than a light-specific masking angle (β). The top sides (8) of the lamellae are covered by a flat reflecting cover, and the lamellae are shaped so as to form two lamellar sections that are symmetrical with the middle vertical longitudinal plane; their flat top sides, starting below the light source, form an angle with the longitudinal plane that approximately corresponds to the masking angle (α) and have the opposite slopes such that they are in tangential proximity to the light source (1) but do not come in contact with it, and they extend as far as the reflectors (2).

Inventors

  • 👤 Christian Bartenbach

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-25 23:19
CPC Classifications
F; F21; F21V; F21V11/00; F21V11/02; F21Y; F21Y2103/00

Claims Analysis

Total Claims: 4
Claim 1
Independent Claim 294 words
In a light fixture with a rod-shaped light source and concave reflectors on both longitudinal sides of the light source extending above the light source, the concave reflectors having a curvature such that all the rays of light reflected across the light source emerge in the transverse direction either directly or after reflection at an angle that is steeper than a light-specific masking angle α, and with lamellae that have an approximately V-shaped cross section and run across the vertical middle longitudinal plane of the light source and have reflecting concave side surfaces with a curvature such that all the rays of light reflected in the longitudinal direction of the light source emerge in the longitudinal direction either directly or after reflection at an angle that is steeper than a light-specific masking angle β, and the top sides of the lamellae are covered by a flat reflecting cover, the improvement comprising: the lamellae are shaped so as to form two lamellar sections that are symmetrical with respect to the middle vertical longitudinal plane of the light source; and the flat top sides of the lamellae are reflective and run obliquely with respect to the longitudinal plane and with the opposite slopes on opposite sides of the longitudinal plane, starting below the light source, at an angle that corresponds approximately to the masking angle α with tangential but contact-free proximity to the light source, and extending as far as the concave reflectors, so that light rays obliquely leaving the light source will strike the oblique reflecting top surfaces of the lamellae and thus are reflected upwardly to strike the concave reflectors at an angle at least substantially as steep as the masking angle α, thereby reducing glare caused by relatively shallow angle reflected light rays.
Claim 2
Dependent Claim 294 words
In a light fixture with a rod-shaped light source and concave reflectors on both longitudinal sides of the light source extending above the light source, the concave reflectors having a curvature such that all the rays of light reflected across the light source emerge in the transverse direction either directly or after reflection at an angle that is steeper than a light-specific masking angle α, and with lamellae that have an approximately V-shaped cross section and run across the vertical middle longitudinal plane of the light source and have reflecting concave side surfaces with a curvature such that all the rays of light reflected in the longitudinal direction of the light source emerge in the longitudinal direction either directly or after reflection at an angle that is steeper than a light-specific masking angle β, and the top sides of the lamellae are covered by a flat reflecting cover, the improvement comprising: the lamellae are shaped so as to form two lamellar sections that are symmetrical with respect to the middle vertical longitudinal plane of the light source; and the flat top sides of the lamellae are reflective and run obliquely with respect to the longitudinal plane and with the opposite slopes on opposite sides of the longitudinal plane, starting below the light source, at an angle that corresponds approximately to the masking angle α with tangential but contact-free proximity to the light source, and extending as far as the concave reflectors, so that light rays obliquely leaving the light source will strike the oblique reflecting top surfaces of the lamellae and thus are reflected upwardly to strike the concave reflectors at an angle at least substantially as steep as the masking angle α, thereby reducing glare caused by relatively shallow angle reflected light rays.
Claim 3
Dependent Claim 44 words
Light fixture according to claim 1, wherein the two inclined lamellar sections are connected by a lamellar section which runs perpendicular to the middle longitudinal plane of the light source, and the length of which is smaller than the diameter of the light source.
Claim 4
Dependent Claim 25 words
Light fixture according to claim 1, wherein each lamella has an inclined lower longitudinal edge which is parallel with the top side of the lamella.

References Cited (Backward Citations)

US3124310A Cited
US1153443A Cited
US2299276A Cited
US3363093A Cited
US3382357A Cited
US3560729A Cited
US4407011A Cited
DE8106507U1 Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1988-09-02 1989-03-04 1989-09-03 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1992-09-02 1993-03-04 1993-09-03 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1996-09-02 1997-03-04 1997-09-03 $7700.00 Window Closed / Lapsed

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