Luminaire for controlling locally unidirectional light

• US 4,088,883 A
• Filed: 05/27/1977
• Issued: 05/09/1978
• Est. Priority Date: 07/21/1975
• Status: Expired due to Term

• Current Assignee: Bausch & Lomb Incorporated (Bausch Health Cos., Inc.)
• Original Assignee: Bausch & Lomb Incorporated (Bausch Health Cos., Inc.)
• Inventors: Dey, Thomas W.
• Primary Examiner(s): Engle, Samuel W.
• Assistant Examiner(s): Walsh, Donald P.
• Application Number:
  US05/801,279
• Time in Patent Office: 347 Days
• Field of Search: 240/41.3, 240/41.35 C, 240/41.37, 240/41.4 R, 240/78 LD, 240/92, 240/93, 240/103 R, 240/103 B, 240/106 R, 240/106.1
• US Class Current: 362/263
• CPC Class Codes: F21V 5/00 Refractors for light sources characterised by cooling arrangements F21V29/504
• CPC Class Codes: F21V 7/0066 specially adapted to cooperate with point like light sources; specially adapted to cooperate with light sources the shape of which is unspecified F21V7/16 - F21V7/30 take precedence

Abstract

A luminaire having an aperture provides first and second zonal illumination areas. A reflector is disposed about a light source for reflecting a first portion of light emitted from the light source through a first zone of the aperture. A deviator is disposed within the reflector for permitting passage of the first portion of light and for directing a second portion of light emitted from the light source through a second zone of the aperture.

Claims

1. A luminaire for displaying locally unidirectional light through zones of substantially equal illumination, comprising:

a high intensity discharge light source for emitting light;

a reflector having a reflecting surface extending to a boundary substantially defining an aperture of the luminaire to reflect from the reflecting surface a portion of the light from the light source as locally unidirectional light through a first illumination zone of the aperture of the luminaire; and

deviator means disposed before the reflector for preventing the direct passage of light from said light source to the first illumination zone of the aperture, the deviator means and the reflector each being individually shaped and disposed to cause a light source light ray reflected at the innermost part of the reflecting surface of the reflector to pass outward of the deviator means to be transmitted to the innermost part of the first illumination zone of the aperture and to cause a light source light ray reflected at the outermost part of the reflecting surface of the reflector means to be transmitted to the outermost part of the first illumination zone of the aperture, the deviator means being disposed to deviate light source light rays not reflected by the reflecting surface inward of the deviator means to a second illumination zone of the aperture of the luminaire, inward of the first illumination aperture zone, to provide substantially equal illumination in the first and second zones of the aperture of the luminaire.

2. A luminaire for displaying substantially uniformly distributed locally unidirectional light flux, comprising:

a high intensity discharge light source for emitting light;

a reflector having a reflecting surface extending to a boundary substantially defining an aperture of the luminaire to reflect from the reflecting surface a portion of the light from the light source as locally unidirectional light substantially uniformly across a first illumination zone of the aperture; and

deviator means disposed before the reflector for preventing the direct passage of light from said light source to the first illumination zone of the aperture, the deviator means being disposed to deviate light source light rays not reflected by the reflecting surface through the deviator means to a second illumination zone of the aperture of the luminaire, inward of the first illumination aperture zone, the deviator means in cooperation with the reflector providing locally unidirectional light flux uniformly distributed across the first illumination zone of the aperture.