Lighting device, particularly a motor vehicle light

The present invention relates to lighting devices of the type that comprise a luminous source, a primary reflector and a secondary reflector.

The purpose of this invention is to implement a lighting device of the type described above, which is especially designed for use inside a motor vehicle light, more specifically, inside the “third stop-light”, and has a simple, compact structure, which is nevertheless capable of providing high performance.

According to the invention, the lighting device is essentially characterized in that:

the primary reflector is composed of a hollow body that defines a pair of ellipsoid-shaped pointed elements, which face in opposite directions to each other, between which a luminous source is placed,

said luminous source consists of a filament lamp,

the secondary reflector comprises an elongated element with steps, at whose centre said primary reflector is placed with the above pointed elements facing the steps.

As explained previously, according to the invention, the shape of the lighting device makes it especially suitable for application to the rear light, or “third stop-light” of motor vehicles. In this application, the lighting device is normally made complete by a transparent plate for diffusing the luminous beam produced by the primary and the secondary reflectors.

The invention is described below in detail, with reference to the attached drawings, which are provided by way of example in a non-limitative manner, in which:

FIG. 1 shows a schematic perspective view of a lighting device in conformity with the invention, and

FIG. 2 shows a lengthwise sectional view of FIG. 1 .

With reference to the drawings, in conformity with the invention, the lighting device comprises a luminous source 1 , made up of an incandescent, or filament lamp, for example, of the P21 type, which is used in the motor vehicles sector, and which is placed between a primary reflector 2 and a secondary reflector 3 .

The primary reflector 2 consists of a hollow body with double ellipsoid shape, which defines two essentially pointed elements facing in opposite directions 4 , 5 , in the area where both are joined, on which the lamp 1 is placed, so that it is hidden from view on the outside.

The primary reflector 2 is suitably composed of a first portion 2 a , which is incorporated into the secondary reflector 3 , thus composing a single piece of moulded plastic material; and of a second portion 2 b , which is connected to the first portion so as to allow it to be detached from the device, and serves to expose the filament lamp 1 and make it accessible. The detachable connection between portions 2 a and 2 b , which is not shown in detail in the drawings as technicians in this sector are familiar with it, may be for example of the jointed or snap-on type.

The secondary reflector 3 is composed of an elongated element, i.e. whose dimensions are larger longitudinally than they are vertically, by the centre of which the primary reflector 2 is placed. The connection between both reflectors 2 , 3 is rigid, and the reflectors may be composed of a single piece if they are made of moulded plastic.

The surface of the secondary reflector 3 , which is placed on the side of the primary reflector 2 , consists of a plurality of stepped segments 6 , towards which the pointed elements 4 and 5 are turned.

Said pointed elements 4 , 5 may be formed on the back, i.e. opposite the secondary reflector 3 , by respective slits 7 .

The device is completed by a transparent element, not shown, which is placed at the front of reflectors 2 and 3 . Said transparent element will be equipped, as is in itself known, with micro-optic diffusers for angular control of the luminous beam going out of the lighting device.

During operation, the light produced by the luminous source 1 is mostly collected, in a controlled manner, by the primary reflector 2 and aimed by the surfaces of the two pointed elements 4 , 5 , towards the secondary reflector 3 . The latter extracts the light going out of the primary reflector and focuses it on a transparent element (not shown in the drawings), which is normally placed in front of the reflectors 2 , 3 , as already stated, to complete the lighting device.

The pitch, i.e. the distance between the steps 6 of the secondary reflector 3 , may vary, and in any case, is such as to cast a uniform light on the transparent element.

Any slits 7 located on the back surface of the two pointed elements 4 , 5 of the primary reflector 2 serve to cast a direct light at the centre of the transparent element, in order to heighten the effect whereby the primary reflector 2 appears hidden from the outside.

Naturally, the construction details and the implementation methods can vary extensively with respect to what is described and illustrated without, for this reason, going beyond the scope of this invention, as is defined in the claims that follow.