EP3508784B1

EP3508784B1 - Truncated cone diffuser for led chip on board

Info

Publication number: EP3508784B1
Application number: EP18075013.5A
Authority: EP
Inventors: Stefano Grisoni
Original assignee: Individual
Current assignee: Individual
Priority date: 2018-01-03
Filing date: 2018-10-11
Publication date: 2020-05-27
Anticipated expiration: 2038-10-11
Also published as: IT201800000316A1; EP3508784A1

Description

The systems and tools that enable a truncated cone system to be used to achieve light effects in photography, including film, television and more, are well-known. Such a prior art system is known from CN 103836455 A .
In particular, this invention refers to an assembly according to claim 1.
This invention concerns an assembly that is able to diffuse the sum of at least one LED chip on board matrix assembled on a heatsink, able to obtain a single light beam, varying its amplitude and intensity through a longitudinal movement forward and backward, with respect to the surface of the lens.
The operator often uses instruments where the LED chip on board remains fixed and the lens is moved forward or backward through telescopic mechanisms, or through the use of parabolic systems, to vary the angle of the beam of light.
In these operations, the user must telescopically remove the lens, act on existing telescopic systems or operate parabolic elements. This is a significant loss of time and concentration.
The invention, as specified in the claims, solves these problems, as the following main functions are completed with the invention: the addition of at least one LED chip on board matrix to form a single light beam, improving its homogeneity, variation of the light beam angle through movement of the instrument and use of a single truncated cone diffuser housed on a heatsink cooled by a fan, further improving overall heat dissipation.
According to the invention, the diffuser consists of a central body with a truncated cone open at the ends and a base on the smaller end of the truncated section, with housing for at least one LED chip on board and housings for some clamping elements respectively on the surface of the base.
This invention will be better described with the help of drawings that show only one of the possible creations:

Figure 1 is a blown-up view of a luminaire where the truncated cone diffuser is anchored on a heatsink;
Figure 2 is the front view of the luminaire, including the truncated cone diffuser anchored on a heatsink inside a luminaire, where the position of some moving components is highlighted;
Figure 3 is a top section view of the luminaire, where the position of the truncated cone diffuser housed on a heatsink with respect to the lens position is highlighted. Moreover, the moving parts suitable for carrying out the movement of said diffuser are also highlighted;
Figure 4 is a side-section view of the luminaire and the assembled components involved in its movement;
Figure 5 is a detail of figure 2 that shows only the truncated cone diffuser seen from the side and the housings for the clamping elements;
Figure 6 is a detail of figure 2 that highlights only the truncated cone diffuser seen from behind, highlighting the housings for the clamping elements, highlighting the position for the housing of some LED chips on board and highlighting the contact surfaces between said diffuser and heatsink;
Figure 7 is a detail of figure 2 that highlights the truncated cone diffuser and at least one LED chip on board assembled on the truncated cone heatsink seen from behind, highlighting the contact surfaces between the contact surface of the truncated cone diffuser and the contact surface of the LED chip on board;
Figure 8 is a detail of figure 2 that highlights the truncated cone diffuser and at least one LED chip on board assembled on the truncated cone heatsink seen from the side, highlighting the contact surfaces between the contact surface of the truncated cone diffuser and the contact surface of the LED chip on board;
Figure 9 is a detail of figure 2 that shows the blown-up view of the truncated cone diffuser and at least one LED chip on board, highlighting the contact surface of the LED chip on board, the LED matrix of said LED chip on board and the housing of the chip on board matrix on the truncated cone heatsink;
Figure 10 is a detail of figure 2 that highlights only the heatsink seen from below in orthogonal view, highlighting the contact surface of the LED chip on board with the surface of the heatsink and the air chamber (also referred to as inner tube), and highlighting a lateral surface of said heatsink.

With reference to the drawings, a device designed to diffuse the sum of at least one LED chip on board matrix housed inside the diffuser device, designed to obtain a single light beam housed on a heatsink by varying the amplitude and intensity of the light beam through a longitudinal movement forward and backward, with respect to the surface of the lens, is indicated in number 4.
Said device 4 includes:

A thermal heatsink 5 on which a truncated cone diffuser 4 is assembled at the centre of device 5 with one or more LED chips on board 12 inside. This device has a conical section tending to widen outwards. This is the LED chip on board 12 that is assembled on the heatsink 5 inside the diffuser 4, having a contact surface 5a suitable for better heat dissipation. As the truncated cone diffuser 4 is anchored to the surface 5a of heatsink 5, housing at least one said LED chip on board 12 in position 4e on diffuser 4, fixing is provided by way of fixing elements 13, as the truncated cone diffuser 4 is equipped with housings 4c for the clamping of fixing elements 13.
Movable elements 2 assembled on the surfaces 5c of the dissipator 5, movable on a guidance system 14 suitable for the movement of the dissipating elements 5, the diffuser 4, the chip on board 12, the inner tube 6 and the fan 7. These movable elements 2 being mounted on a support structure 10 provide an effective engagement with the elements suitable for motion transmission 3, allowing for greater stability and precision of movement. These elements, being capable of moving forward or backward in relation to the plane of lens 1, by way of a motor 9, or manually, having elements suitable for motion transmission 3 as a mechanism.
As the support structure 10 is fixed to the lamp structure 11 by way of clamping elements 8 so as to prevent movement, thereby rendering the support structure 10 solid.
An inner tube 6 is joined and superimposed on one side with the surface 5b of the heatsink 5, having fan 7 in opposition.

Claims

Assembly for a luminaire, the assembly comprising a truncated cone diffuser (4), at least one LED chip on board (12), at least one heatsink (5), at least one air chamber (6), at least one fan (7), at least one movable element (2), at least one element suitable for motion transmission (3) housed in at least one guidance system (14), wherein the assembly comprises a base (4a) with angular opening from which a shape of truncated cone section (4h) extends from the truncated cone diffuser (4) widening outward, respectively assembled on the LED chip on board (12) suitable for containing a LED matrix (12c) placed on a first surface (12a) of said LED chip on board (12), wherein the truncated cone diffuser (4) is open at the ends, and comprises the base (4a) and the truncated cone section (4h), having on a first surface (4b) of the base (4a) of the truncated cone diffuser (4), housings (4c) for some fixing elements (13) and an open truncated cone part acting as a housing (4e) for said truncated cone diffuser (4), suitable for housing the LED matrix (12c) of the at least one LED chip on board (12), wherein the first surface (12a) of the LED chip on board (12) is in contact with a second surface (4d) of the truncated cone diffuser (4), a second surface (12b) of the LED chip on board (12) and the second surface (4d) of said diffuser (4) are in contact with a first surface (5a) of the heatsink (5) by way of fixing elements (13), a second surface (5b) of the heatsink (5) assembled on the other side is in contact with the air chamber (6) and in opposition, the assembled fan (7) and, wherein on a third surface (5c) of the heatsink (5), the moving elements (2) and elements suitable for motion transmission (3) are assembled, housed in the guidance system (14) which is movable.
Assembly according to claim 1, characterised by the fact that the assembly is movable longitudinally with respect to the surface of a lens (1) of the luminaire.
Assembly according to claim 1, characterised by the fact that the assembly is suitably integrated with a support structure (10) of the luminaire, wherein the guidance system (14) is assembled on said support structure (10) which is fixed to a lamp structure (11) of the luminaire by way of clamping elements (8).
Assembly according to claim 1, characterised by the fact that the assembly is capable of varying the amplitude, intensity and brightness of the LED matrix (12c) placed on at least one LED chip on board (12).