Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
PRIMARY ENS SET FOR LIGHTING FIXTURES
Document Type and Number:
WIPO Patent Application WO/2010/106391
Kind Code:
A1
Abstract:
An optical embodiment is adapted in a lighting fixture to receive the radius light-flux that are emitted directly from the light-source toward the distribution lens (or the Outlet Surface of the Fixture) and to convert those radius vectors to parallel vectors at predetermined angles, so as to project the controlled light-flux toward the target area to be illuminated (with the most efficient distribution and the least light-pollution).

Inventors:
CHU, Michael, Yi (7F. No. 249, Daan RoadSection 1,106 taipei, Taiwan Province of China, CN)
Application Number:
IB2009/005047
Publication Date:
September 23, 2010
Filing Date:
March 17, 2009
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
CHU, Michael, Yi (7F. No. 249, Daan RoadSection 1,106 taipei, Taiwan Province of China, CN)
International Classes:
F21V13/04
Foreign References:
GB429357A
DE19632189A1
US5103381A
EP0380663A1
Download PDF:
Claims:
distributing light-flux on the target area to be illuminated.

Whereas the predetermined angle shall be the same or similar to the angle of those parallel light-flux from the fixture reflector.

2. The optical embodiment as claimed in claim 1, that uses the combination of a primary refraction lens and a ring-shaped reflector using parabolic curve.

3. The optical embodiment as claimed in claim 1, that uses the combination of a primary refraction lens and a ring-shaped refraction lens accommodated with a cone-shaped reflection ring.

4. The optical embodiment as claimed in claim 1, that uses the combination of a primary refraction lens and a ring-shaped refraction lens. The ring-shaped refraction lens consists of the incident surface, the reflection coated surface and the exit surface.

Since the objective of the ring-shaped refraction lens is to convert the radius incident rays to parallel vectors and then to project toward the distribution lens (or the 0. S . F. ) , either one of the above stated three surfaces could be designed to convert the radius vectors to parallel vectors, such as convex incident surface or convex exit surface or parabolic curved reflection coated surface. Whereas the remaining two surfaces can be used to fine tune the projective angles.

5. Any omission of or modification to the above claims, such as -but not limited to- punch a hole at the center of the primary refraction lens, or alter the curve of the above elements, etc....

Description:
PRIMARY LENS SET FOR LIGHTING FIXTURES CROSS-REFERENCE TO RELATED APPLICATION

This application claims priority of application, on , 2009 . .

BACKGROUND OF THE INVENTION

1. Field of the Invention

The invention relates to the optical design of lighting fixtures, capable of better controlling the distribution of light-flux on the target area to be illuminated.

2. Description of the Related Art

Current Lighting Fixtures consists of a light-source, a reflector and the Outlet Surface of the Fixture (here-in-after referred to as the O. S . F. ) , with or without a distribution lens. Taking Spot-Light Fixtures as an example '■

1) The light-source emits light flux toward 360° spherically.

2) The parabolic curved fixture reflector converts the light-flux to parallel vectors toward the O.S.F. or the distribution lens for projection toward the target area to be illuminated.

3) The remaining light-flux which are not affected by the fixture reflector and which are directly & spherically emitted by the light-source toward the O.S.F. or the Distribution Lens, will remain in radius vector.

Therefore, the incident light-flux on the distribution lens (or O.S.F.) consists of two or more different vectors . When one vector is aimed at the target, the other vector will be shunned from the target. Thus, distribution of lights can not be fully controlled; light-pollution increased and energy is wasted. SUMMARY OF THE INVENTION

Therefore, the object of the present invention is to convert those radius vectors, which are not affected by the fixture reflector, to parallel vectors toward the distribution lens (or the O.S.F.) .

The incident angles of above stated radius vectors are ranged between 0° and i B° spherically in relation to the normal line of the distribution lens (or the O. S. F.) .

Whereas the value of B° = 180° — θ , and θ is a half of the angle of the fixture reflector in relation to the light-source.

According to the present invention, multiple elements are provided to convert those radius vectors ranged between 0° and ± B° to parallel vectors as follows :

For radius vectors ranged between 0° and ±A° , a refraction lens is provided. The value of incident angle A° shall be determined by considering the Refraction Index of the lens material, its Critical Angle and the designer' s tolerable Fresnel loss.

For radius vectors ranged between ±A° and ±B° , the following combinations can be provided •'

* A ring-shaped reflector using parabolic curved surface.

* A ring-shaped refractor lens accommodated with a cone-shaped reflector ring.

* A ring-shaped refractor lens that consists of the incident surface, the total reflection coated surface and the exit surface.

Therefore, the present invention and the fixture reflector can precondition all light-flux emitted by the light-source in parallel vectors toward the distribution lens (or the O.S.F.), for the ideal control of all light-flux toward the target area to be illuminated. BRIEF DESCRIPTION OF THE DRAWINGS

Other features and advantages of the present invention will become apparent in the following detailed description of the embodiments with reference to the accompanying drawings, of which:

Figure 1 is a schematic diagram of the Current Lighting Fixtures .

Figure 2 is a schematic diagram of the first embodiment of the present invention.

Figure 3 is a schematic diagram of the second embodiment of the present invention.

Figure 4 is a schematic diagram of the third embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

Before the present invention is described in greater detail with reference to the accompanying embodiments, it should be noted herein that like elements are denoted by the same reference numerals throughout the disclosure.

Referring to Figure 1, the Current Lighting Fixtures is shown that the light-source O is emitting light-flux in radius form toward 360° spherically. The fixture reflector © is basically a parabolic curved bowl, with light-source O located at the focal point, for reflecting the radius light-flux to parallel vectors toward the distribution lens (or the O.S.F.)©.

When the fixture reflector θ reflects 2θ degree of the radius lights from the light-source O, the total percentage (%) of light-energy (Er) from the light-source

O that are reflected and converted to parallel vectors by the fixture reflector, can be calculated as follows ■' Er = (1- Cos6>)/2

[ when θ= 110° , Er = (1- CosllO° ) / 2 = 67.1 %] The actual output shall be discounted by the Reflection Index of the reflector surface.

Therefore, the remaining percentage of light-energy

(Ed) that are directly radiated by the light-source O toward the distribution lens (or the O.S.F.)© amount to '•

Ed = 1- [ (1- Cos#)/2]

[ when θ = 110° , Ed = 1- 67.1 % = 32.9 %]

Since at the same spot on the distribution lens (or the O.S.F.)©, there are two or more incident light-vectors, the direction of exit-light can only be controlled at the sacrifice of other vectors .

The present invention is designed to convert those radius vectors not controlled by the fixture reflector θ to parallel vectors for projection toward the distribution lens (or the O.S.F.)© - thus achieving best optical control by the Distribution Lens. Figure 2 illustrates a lighting fixture with the present invention using the primary refraction lens O and the ring-shaped reflector embodiment with parabolic curved surface θ installed between the light-source O and the distribution lens (or the O.S.F.)© to convert the radius incident light-flux that are ranged between ±0° and B° , to parallel vectors toward the distribution lens (or the O. S. F. )©.

As shown in Figure 2, the primary refraction lens O is used as one embodiment of the present invention, for refracting "the radius incident rays that are ranged between 0° and A° " to parallel vectors toward the distribution lens (or the O.S.F.)©. The maximum incident angle A° shall be determined by considering the Refraction Index of the lens material, its Critical Angle and the designer's tolerable Fresnel Loss.

In addition to the primary refraction lens O, a ring-shaped reflector embodiment with parabolic curved surface 0 is to reflect those radius incident light-flux ranged between A° and B° , to parallel vectors toward the distribution lens (or the O.S.F.)Θ.

Whereas, the value of B° = 180° —θ (see Figure 1, θ is a half of the angle of the fixture reflector θ in relation to the light-sourceO) . Therefore, the entire light-flux emitted 360° spherically by light-source are converted to parallel vectors toward the distribution lens (or the O.S.F.)©. Figure 3 illustrates another alternative embodiment of the present invention using the primary refraction lens O and a ring-shaped refraction lens w to convert those radius light-flux ranged between A° and B° from light source O, to parallel vectors for reflection by the cone-shaped reflector ring w toward the distribution lens (or the O.S.F. ) θ.

Figure 4 illustrates the configuration and the details of another alternative embodiment of the present invention that uses a ring-shaped refraction lens © which consists of the incident surface w , the reflection coated surface © and the exit surface w .

When the incident surface © is designed as convex surface, the incident radius rays ranged between A° and B° are refracted into parallel vectors toward the reflection coated surface w . Since the reflection coated surface Vp & the exit surface © are flat surface designed, the parallel light vectors will be directed at predetermined angle toward the distribution lens (or the

O.S.F. ) θ.

What is claimed is :

1. An optical embodiment is adapted in lighting fixtures to receive the radius light-flux directly emitted by the light-source toward the distribution lens (or the Outlet

Surface of the Fixture) , and to convert it to parallel vectors with predetermined angles toward the distribution lens (or the Outlet Surface of the Fixture) , for