Reading and viewing lamp

• US 4,388,678 A
• Filed: 10/14/1980
• Issued: 06/14/1983
• Est. Priority Date: 10/14/1980
• Status: Expired due to Term

• Current Assignee: Wheeler M. Turner
• Original Assignee: Wheeler M. Turner
• Inventors: Turner, Wheeler M.
• Primary Examiner(s): Nelson, Peter A.
• Application Number:
  US06/196,391
• Time in Patent Office: 973 Days
• Field of Search: 362/33, 362/96, 362/97, 362/101, 362/127, 362/128, 362/145, 362/153, 362/293, 362/294, 362/296, 362/297, 362/310, 362/318, 362/345, 362/32, 362/356, 362/98, 362/99, 362/347 , 362/322
• US Class Current: 362/293
• CPC Class Codes: F21S 6/005 with a lamp housing maintained at a distance from the floor or ground via a support, e.g. standing lamp for ambient lighting
• CPC Class Codes: F21S 6/006 for direct lighting only, e.g. task lighting
• CPC Class Codes: F21V 11/16 using sheets without apertures, e.g. fixed
• CPC Class Codes: F21V 13/08 the elements being filters or photoluminescent elements and reflectors
• CPC Class Codes: F21V 13/10 the elements being reflectors and screens
• CPC Class Codes: F21V 7/0008 providing for indirect lighting
• CPC Class Codes: F21V 7/24 characterised by the material
• CPC Class Codes: F21V 9/04 for filtering out infrared radiation dichroic reflectors F21V7/22; using liquid-filled chambers F21V9/12
• CPC Class Codes: F21V 9/06 for filtering out ultraviolet radiation
• CPC Class Codes: F21V 9/12 with liquid-filled chambers

Abstract

This invention provides an improved reading or viewing lamp that achieves extraordinary visual acuity when properly used. The lamp employs a quartz-halogen bulb together with a parabolic lens to provide a collimated beam. A light filter removes heat radiation and ultra violet radiation from the beam. A convex mirror reflects the filtered light beam to the reading or viewing area where because of the point source characteristic of the bulb and the remaining optics, the rays are substantially non-crossing and transversely coherent in the reading or viewing area. In one embodiment, the collimated beam is directed vertically and tubular light shield surrounding the collimated light beam and a cylindrical shield around the convex mirror reduces transverse radiation of light to other parts of the room. The shield around the collimated beam also provides a chimney effect which disperses the heat throughout the room to points remote from the reader.

Claims

1. In apparatus for directly illuminating an area with a diverging light beam wherein written material or other objects are adapted to be directly viewed in the directly illuminated area, the combination of:

a convex mirror mounted to receive a collimated beam of light and to reflect the collimated beam of light into a diverging beam of light which is directed towards that area; and

means including a source of light for directing a collimated beam of light toward said convex mirror for reflection toward that area, whereby the area is illuminated primarily by light of substantially non-crossing, diverging and unidirectional quality throughout said area.

2. In apparatus as in claim 1, the combination therewith of:

filtering means in the path of said beam between said light source and said convex mirror for filtering out heat rays from the beam.

3. In apparatus as defined in claim 1, the combination therewith of:

filtering means in the path of said beam between the light source and said convex mirror for filtering out ultra-violet rays from said beam.

4. Apparatus as defined in claim 1, the combination therewith of:

filtering means in the path of said beam between said light source and said convex mirror for filtering out heat rays and ultra-violet rays from said beam.

5. The apparatus as in claim 2, the combination therewith of:

a parabolic mirror for reflecting light from a substantially point source and for reflecting said light as a collimated beam toward said convex mirror.

6. In apparatus as in claim 5, the combination therewith of:

a liquid cell mounted transversely of said collimated beam, said water cell comprising a pair of parallel flat plates that absorb ultra-violet radiation, said liquid cell being filled with heat-ray absorbing liquid, whereby the light beam remains collimated after passage through said cell.

7. In apparatus as defined in claim 1, the combination therewith of:

a light shield surrounding said mirror for acting as a barrier to the transmission of light from said mirror in a horizontal direction.

8. In apparatus as defined in claim 5, the combination therewith of:

an open ended opaque tube surrounding said collimated beam for preventing viewing of the light source and said parabolic mirror from the side of said beam.

9. In apparatus as defined in claim 6, the combination therewith of:

an open ended opaque tube surrounding said collimated beam and said liquid filter for preventing viewing of the light source and said parabolic mirror and said liquid filter from the side of said beam.

10. In apparatus as defined in claim 1, the combination therewith of:

means adjustably supporting said convex mirror for altering the direction of reflection of said beam relative to the direction of incidence of the beam on said convex mirror whereby the area illuminated by said reflected beam may be altered.

11. In apparatus for directly illuminating an area with a diverging light beam wherein reading material or other objects may be directly examined, the combination of:

a support structure having a base member at the lower end thereof and a support member at the upper end thereof;

means including a substantially point source of light and a parabolic mirror firmly mounted on a said base member for projecting a collimated beam of light upwardly toward said upper member; and

a convex mirror mounted on said support member for intercepting said collimated beam and for reflecting the beam as a diverging beam transversely and downwardly toward said area.

12. An apparatus as defined in claim 11, the combination therewith of:

filtering means supported in the path of said beam between said point source and said convex mirror for filtering out heat rays and ultra-violet rays from the beam.

13. An apparatus as defined in claim 11 in which:

said upper support member comprises two articulated arms, one of said arms being secured to said support structure and having an end remote from the support structure terminating near the center of said collimated beam and the other of said arms being pivotally connected to said remote end and means at the free end of said other arm adjustably supporting said convex mirror at the other end thereof whereby the direction of reflection toward said area is adjustable.

14. In apparatus as in claim 11, the combination therewith of:

a liquid cell mounted transversely of said collimated beam, said liquid cell comprising a pair of parallel flat plates that absorb ultra-violet radiation, said liquid cell being filled with heat-ray absorbing liquid, whereby the light beam remains collimated after passage through said cell.

15. In apparatus as defined in claim 14, the combination therewith of:

a light shield attached to and surrounding said convex mirror for acting as a barrier to the transmission of light from said mirror in a horizontal direction; and

an open ended opaque tube supported from said base member surrounding said collimated beam for preventing viewing of the light source and said parabolic mirror from the side of said beam.

16. In apparatus as in claim 11, the combination therewith of:

a liquid cell mounted transversely of said collimated beam, said liquid cell comprising a pair of parallel flat plates that absorb ultra-violet radiation, said liquid cell being filled with heat-ray absorbing liquid, whereby the light beam remains collimated after passage through said cell,

an open ended opaque tube supported from said base member surrounding said collimated beam and said liquid cell for preventing viewing of the light source and said parabolic mirror and said liquid cell from the side of said beam,

said upper support mirror comprising two articulated arms, one of said arms being secured to said support structure and having an end remote therefrom aligned with the central axis of said beam, and the other of said arms being pivotally connected to said remote end and adjustably supporting said convex mirror at the other end thereof whereby the direction of reflection toward said area is adjustable.

17. An apparatus as defined in claim 11 or in claim 16 wherein said convex mirror is a rear surface mirror.