EP0449219A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Beacon lantern and lens for the same
Assignee: Zeni Lite Buoy Co Ltd
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Filing: 1991-03-26
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Granted: —
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Expires: 2011-03-26
Abstract
Abstract According to the invention a beacon lantern and a lens (1) for the same with improved light transmission factor are provided which is easy to manufacture and uses LEDs as light source. The lantern comprises a light source (10) of a plurality of LEDs radially distributed on a horizontal circumference and a cylindrical fresnel lens (1) converging beams of light in horizontal directions, in which the lens comprises a sheet-like, fine prism-shaped linear fresnel lens bent into the shape of a cylinder. Furthermore, the lantern comprises a top lid (18) and a lower lantern body (19), which are held with a prescribed distance therebetween by way of a center bolt, between said lid and lower lantern body a transparent cylindrical cover (2) is arranged, on the inner surface thereof is the rolled sheet-like linear fresnel lens joined therewith.
Inventors
- 👤 Tadahiro C/O Zeni Lite Buoy Comp.Ltd. Arimura
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 20:34
CPC Classifications
F; F21; F21V; F21V5/00; F21V5/04; F21V5/046; F21S; F21S10/00; F21S10/06; F21W; F21W2111/00; F21Y; F21Y2115/00; F21Y2115/10; Y; Y10; Y10S; Y10S362/00; Y10S362/80
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
76 words
A lantern comprising a light source of a plurality of LEDs (10) and a cylindrical fresnel lens (1) converging beams of light in all horizontal directions, characterized in that said LEDs are radially distributed on a horizontal circumference and that said cylindrical fresnel lens (1) is made by bending a transparent film with a fine prism-shaped linear fresnel lens formed on the surface thereof, into a shape of a cylinder or a frustum of the cone.
Claim 2
Dependent Claim
140 words
A lantern in accordance with claim 1 comprising: A transparent cover (2) embedding a solar battery (3) at the upper inner surface thereof; a flasher unit case (6), in which the upper edge of the cylindrical fresnel lens (1) is inserted into and fastened at the upper periphery thereof, a flasher unit (7) is housed therein, a light source (10) is supported in the bottom center thereof and mounted on the lower surface of the upper part of the cover (2); and a lens support (14) that is inserted into and fastened at the lower inner surface of the cover and supports the lower edge of the cylindrical fresnel lens (1); in which the thin cylindrical fresnel lens is supported concentrically with the cover (2) maintaining a small gap between the lens and the inner surface of the cover (2).
Claim 3
Dependent Claim
45 words
A lens for a lantern, characterized by a thin transparent film with a fine prism-shaped linear fresnel lens (1) formed on the surface thereof, said film being bent to the shape of a cylinder or a frustum of a cone and held in such shape.
Claim 4
Dependent Claim
41 words
A lens for a lantern in accordance with claim 3, in which the linear fresnel lens (1) is joined to the inner surface of a cover, is provided with longitudinal contact joints and is divided in the direction of the circumference.
Claim 5
Dependent Claim
26 words
A lens in accordance with claim 3, wherein several linear fresnel lenses (1) are arranged parallel in the longitudinal direction so as to contact each other.
Claim 6
Dependent Claim
26 words
A lens for a lantern in accordance with claim 5, in which the several linear fresnel lenses (1) are formed on a single transparent film surface.
Claim 7
Dependent Claim
32 words
A lens for a lantern in accordance with claim 5 and 6, in which the linear fresnel lens is provided with longitudinal contact joints and divided in the direction of the circumference.
Claim 8
Dependent Claim
78 words
A lantern comprising a lantern lens in accordance with claim 3 or 4, wherein a top lid is supported at a prescribed position by a center bolt (22) established at the lower lantern body (19), and the lens is supported by inserting the same to cover-gripping slits (14') individually established on the lower lantern body (19) and the top lid (18), and a plurality of LEDs are radially arranged at the focal circle (1") of the lantern lens.
Claim 9
Dependent Claim
106 words
A lantern comprising several lantern lenses in accordance with claim 3 or 4, wherein a top lid (18) is supported at a prescribed position by a center bolt (22) established at the lower lantern body, and the lenses are inserted to cover-gripping slits (20) individually established on the lower lantern body (19) and the top lid (18), said lantern lenses are connected by a ring (25) or rings that is or are provided with cover-gripping slits (20) on the top surface and bottom surface thereof respectively, and a plurality of LEDs are radially arranged at the focal circle (1") of each lantern lens in multiple levels.
Claim 10
Dependent Claim
26 words
A lantern in accordance with claim 9, in which the multiple levels of lantern lenses are such that are described in claim 5, 6 or 7.
Claim 11
Dependent Claim
34 words
A lantern in accordance with claim 1, 7, 8, 9 or 10, wherein the lantern is constructed airtight and a desiccant is provided within the lantern to prevent dew condensation of the fresnel lens.
References Cited (Backward Citations)
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