TUBULAR LAMP

Abstract

A tubular lamp (1) comprises a support base (2), a light source (3) and a diffuser body (4). The support base (2) has a longitudinal extension along a lamp development axis (LL) and has an inner face (21) and an outer face (20) for fixing the tubular lamp (1) on an installation plane. The light source (3) is applied to the inner face (21). Finally, the diffuser body (4) extends along the lamp development axis (LL) and engages by form-fitting and / or force-fitting with the support base (2). The diffuser body (4) has a pair of lateral flanks (40a, 40b) made of a reflective polymer material and connected to each other via an emission wall (41).This emission wall (41) is made of a transmitting polymer material and faces the support base (2), such that the light flux emitted through the emission wall (41) comes from the lighting source (3) and from the at least partial reflection of the pair of lateral flanks (40a, 40b). [Fig.1].

Description

Title of the invention: TUBULAR LAMP

[0001] The present invention relates to the field of lighting systems; in particular, the subject of the invention is a tubular lamp adapted to be installed on a wall or “in a corner”, namely along a corner defined by the intersection of two adjoining walls, or alternatively, adapted to be installed along a peripheral edge of a piece of furniture, for example a shelf, a table, a cupboard, a bench, etc.

[0002] The use of tubular wall, corner or furniture lamps is widespread, being used for both interior and exterior lighting.

[0003] However, an important parameter that is taken into consideration for the choice of the lamp is the luminous efficiency, expressed in lumens / watt (Im / W).

[0004] Currently, tubular lamps on the market have an efficiency of between 40 and 80 Im / W.

[0005] Research in this particular technical field, more than improving the luminous efficiency of the tubular lamp, aims to improve the luminous efficiency of the lighting source, for example the strip of light-emitting diodes.

[0006] Unfavorably, this approach focuses on innovation related to the lighting source, and tends to neglect all issues concerning the design and study of the materials of the lamp.

[0007] The aim of the present invention is to provide a tubular lamp capable of eliminating the drawbacks deplored above in relation to lighting systems according to the existing technique.

[0008] Said object is achieved by a tubular lamp according to claim 1. The dependent claims describe preferred embodiments of the invention.

[0009] The characteristics and advantages of the tubular lamp according to the invention will become evident from the following description, associated with its preferred embodiments, given for informational and non-limiting purposes, with reference to the attached figures, in which:

[0010] - [Fig.l] is a cross-section of a tubular lamp according to a mode of favorite achievement;

[0011] - [Fig.2] is a perspective view of the tubular lamp;

[0012] - [Fig.3] is a perspective view of the tubular lamp from a different angle, And

[0013] - [Fig.4] is an axial section of the tubular lamp.

[0014] In said drawings, at 1 there is indicated as a whole a tubular lamp according to the invention.

[0015] For the purposes of this description, the term “tubular” means an elongated element of prismatic or cylindrical shape, and internally hollow.

[0016] In a general embodiment, the tubular lamp 1 is adapted to be installed on a wall or in a corner, namely along a corner defined by the intersection of two adjoining walls, or it is adapted to be installed along an edge of a piece of furniture, for example a shelf, a table, a cupboard, a bench, etc.

[0017] The lamp 1 comprises a support base 2, a light source 3 and a diffuser body 4.

[0018] The support base 2 has a longitudinal extent along a lamp development axis LL and comprises an inner face 21 and an outer face 20 for fixing and installing the tubular lamp 1 on an installation plane, for example a wall.

[0019] The lighting source 3 is applied to the internal face 21.

[0020] The diffuser body 4 extends along the lamp development axis LL and engages by form-fitting and / or force-fitting with the support base 2. This diffuser body comprises a pair of lateral flanks 40a, 40b made of a reflective polymer material, and connected to each other by means of an emission wall 4L. The emission wall 41 is made of a transmitting polymer material, and faces the support base 2, such that the luminous flux emitted through the emission wall 41 comes from the lighting source 3 and from an at least partial reflection from the pair of lateral flanks 40a, 40b.

[0021] According to one embodiment, the lateral flanks 40a, 40b are parallel and face each other, while the emission wall 41 connected to these flanks 40a, 40b is arranged orthogonally to them.

[0022] According to one embodiment, the diffuser body 4 is produced by coextrusion, namely by simultaneous extrusion, of the reflective polymer material which constitutes the pair of lateral flanks 40a, 40b, and of the transmitting polymer material which constitutes the emission wall 41, such that the diffuser body 4 is produced in one piece. In other words, the pair of lateral flanks 40a, 40b is produced without a break in continuity with the emission wall 4L.

[0023] Preferably, and according to the attached [Fig.l], the diffuser body has a cross-section, namely orthogonal to the lamp development axis LL, substantially in the shape of a “C” or a “U”.

[0024] According to one embodiment, the tubular lamp 1 has a rectangular cross-section with dimensions of 9.0 x 9.5 mm.

[0025] Alternatively, the tubular lamp 1 has a square-shaped cross-section with dimensions between 5.0 x 5.0 mm and 9.0 x 9.0 mm.

[0026] According to one embodiment, the opening of the light beam of the tubular lamp 1 is 120°. In particular, the opening of the light beam is the measurement of the angle created by the lighting source 3.

[0027] According to one embodiment, the reflective polymer material and the transmitting polymer material belong to the polycarbonate family. In detail, the reflective polymer material is a polycarbonate to which white pigments have been added. On the other hand, the transmitting polymer material is a transparent polycarbonate, and preferably opacified, so that the user does not directly see the lighting source 3. In other words, the diffuser body 4 is made of a transparent material adapted to diffuse the light emitted from the lighting source 3.

[0028] According to one embodiment, the reflective polymer material has a reflection factor of between 0.8 and 0.99, preferably between 0.88 and 0.99, and even more preferably between 0.98 and 0.99.

[0029] According to one embodiment, the transmitting polymer material has a transmission factor of between 0.65 and 0.85.

[0030] According to one embodiment, the tubular lamp 1 has a luminous efficiency of between 95 and 180 Im / W, and preferably of between 107 and 180 Im / W. In particular, the luminous efficiency of the tubular lamp 1 is exactly 123 Im / W.

[0031] According to one embodiment, the power consumed by the lighting source 3 is between 5 and 20 W / m, it is preferably between 5 and 10 W / m, and it is even more preferably between 5 and 9 W / m. In other words, for each linear meter of lighting source 3, a power of between 5 and 20 W is consumed; preferably, between 5 and 10 W per linear meter; and even more preferably between 5 and 9 W per linear meter.

[0032] According to one embodiment, the diffuser body 4 circumscribes, with the support base 2, an internal region I delimited axially by a pair of closing caps 5a, 5b. The mutual engagement between the diffuser body 4 and the support base 2 delimits radially with respect to the lamp development axis LL the internal region I. In other words, the engagement between the diffuser body 4 and the support base 2 peripherally delimits the internal region I.

[0033] In particular, the engagement of the pair of closing caps 5a, 5b, with the engagement between the diffuser body 4 and the support base 2, isolates the internal region I from the exterior of the tubular lamp.

[0034] According to one embodiment, at least one groove 22 is made on the external face 20 of the support base 2, where at least one magnet 6 is housed by form-fitting and / or force-fitting.

[0035] Alternatively, the magnet 6 is held in the groove 22 by the use of glue or adhesives.

[0036] Preferably, the groove numbering at least one 22 extends continuously, or, in other words, in one go, along the entire axial length of the tubular lamp 1.

[0037] According to one embodiment, the cross-section of the groove 22 is trapezoidal, and the magnet 6 is counter-molded with respect to the shape of the groove 22.

[0038] According to one embodiment, each closing cap of this pair of closing caps 5a, 5b has a tooth which projects parallel to the lamp development axis LL, so as to engage with the groove 22 by form-fitting and / or force-fitting. For example, the cross-section of the tooth is trapezoidal in shape.

[0039] According to one embodiment, the inner face 21 comprises a coupling appendage 23 which projects towards the inner region I and which forms a pair of coupling notches 25a, 25b. The coupling appendage can engage with the pair of lateral flanks 40a, 40b, such that each lateral flank of this pair of lateral flanks 40a, 40b engages with the respective coupling notch of this pair of coupling notches 25a, 25b.

[0040] According to one embodiment, the coupling appendage 23 is dovetail-shaped, or comprises a pair of hooks. In addition, each lateral flank comprises a coupling foot 41a; 41b projecting towards the internal region I and counter-molded with respect to the respective coupling notch 25a; 25b. The coupling foot 41a; 41b projects orthogonally from the respective lateral flank 40a; 40b.

[0041] In particular, the diffuser body 4 constitutes with the support base 2 snap-in coupling means, by the fact that these snap-in coupling means comprise the coupling appendage 23 and the coupling foot 41a; 41b of each lateral flank.

[0042] In this case, the coupling foot 41a; 41b is configured so as to engage by snap-fastening in the respective coupling notch 25a; 25b. The mutual engagement between the diffuser body 4 and the support base 2 elastically deforms the lateral flanks 40a, 40b, widening them outwards, so that the coupling foot 41a; 41b can engage with the respective coupling notch 25a; 25b.

[0043] According to one embodiment, each lateral flank 40a; 40b comprises an internal indentation 42a; 42b capable of defining a concave reflective surface portion 43 facing the lighting source 3, so as to improve the reflection of the light flux towards the emission wall 4L.

[0044] Advantageously, the reflective surface portion, comprising a concavity directed towards the lighting source, further improves the reflection of the light, by directing it towards the emission wall.

[0045] According to one embodiment, the lighting source 3 is a strip of light-emitting diodes which comprises a power supply guide 31 and a plurality of light-emitting diodes 32. In addition, the internal indentation 42a; 42b is substantially aligned with the plurality of light-emitting diodes 32, or else overhangs this plurality of light-emitting diodes 32 in the direction of the emission wall 41.

[0046] Preferably, each light-emitting diode of this plurality of light-emitting diodes 32 has a color temperature of between 2500 and 5000 K. In addition, the luminous efficiency of each light-emitting diode is between 140 and 220 Im / W.

[0047] According to one embodiment, the tubular lamp 1 further comprises electrical power supply means operatively connected to the lighting source 3. These electrical power supply means comprise an electrical power supply line, for example an electrical cable.

[0048] In an innovative manner, the tubular lamp according to the present invention achieves the aim previously set out.

[0049] Advantageously, the tubular lamp which is the subject of the present invention has an extremely high luminous efficiency compared to currently known tubular lamps.

[0050] According to an advantageous aspect, the tubular lamp has a limited number of components, due to the fact that the coextrusion of the lateral flanks with the emission wall makes it possible to obtain a diffuser body made in one piece and without a break in continuity between the emission wall and the pair of lateral flanks.

[0051] According to yet another advantageous aspect, the tubular lamp manages to improve the luminous flux thanks to the reflective polymer material with which the pair of lateral flanks are made. Functionally, the lateral flanks reflect the light emitted by the lighting source and direct it towards the emission wall, so as to maximize the luminous flux.

[0052] Advantageously, the tubular lamp is produced using a simplified production process, since the extrusion of the side walls and the emission wall is carried out simultaneously by coextrusion and not separately.

[0053] To satisfy possible requirements, a technician in the relevant field may make modifications, adaptations and substitutions of elements with other functionally equivalent elements to the embodiments of the tubular lamp according to the present invention, without departing from the limits of the protection conferred. by the following claims. Each of the features described as belonging to a possible embodiment can be realized independently of the other embodiments described.

Claims

Claims

1. Tubular lamp (1) adapted to be installed on a wall or in a corner, namely along a corner defined by the intersection of two adjoining walls, or adapted to be installed along an edge of a piece of furniture, for example a shelf, a table, a cupboard, a bench, etc., said lamp comprising: - a support base (2) having a longitudinal extent along a lamp development axis (LL) and comprising an external face (20) for fixing the tubular lamp (1) on an installation plane, for example a wall, and an internal face (21); - a lighting source (3) applied to the internal face (21);- a diffuser body (4) extending along the lamp development axis (LL) and engaging by form-fitting and / or force-fitting with the support base (2), said diffuser body comprising a pair of lateral flanks (40a, 40b) made of a reflective polymer material, and connected together by means of an emission wall (41) made of a transmitting polymer material and facing the support base (2), such that the luminous flux emitted through the emission wall (41) comes from the lighting source (3) and from an at least partial reflection from the pair of lateral flanks (40a, 40b), the lamp being characterized in that each lateral flank (40a; 40b) comprises an internal indentation (42a; 42b) capable of defining a concave reflective surface portion (43) facing the lighting source (3), so as to improve the reflection of the luminous flux towards the emission wall (41).;

2. Tubular lamp (1) according to claim 1, characterized in that the diffuser body (4) is made by coextrusion of the reflective polymer material which constitutes the pair of lateral flanks (40a, 40b) together with the transmitting polymer material which constitutes the emission wall (41), so that the diffuser body (4) is made in one piece.

3. Tubular lamp (1) according to any one of the preceding claims, characterized in that the reflective polymer material and the transmitting polymer material belong to the polycarbonate family.

4. Tubular lamp (1) according to any one of the preceding claims, characterized in that the reflective polymer material has a reflection factor of between 0.8 and 0.99, preferably between 0.88 and 0.99, and even more preferably between 0.98 and 0.

99.

5. Tubular lamp (1) according to any one of the preceding claims, characterized in that the transmitting polymer material has a transmittance factor of between 0.65 and 0.

85.

6. Tubular lamp (1) according to any one of the preceding claims, characterized in that the luminous efficiency is between 95 and 180 Im / W, and is preferably between 107 and 180 Im / W.

7. Tubular lamp (1) according to any one of the preceding claims, characterized in that the power consumed by the lighting source (3) is between 5 and 20 W / m, in that it is preferably between 5 and 10 W / m, and in that it is even more preferably between 5 and 9 W / m.

8. Tubular lamp (1) according to any one of the preceding claims, characterized in that the diffuser body (4) circumscribes, with the support base (2), an internal region (I) delimited axially by a pair of closing caps (5a, 5b).

9. Tubular lamp (1) according to any one of the preceding claims, characterized in that, on the external face (20) of the support base (2), at least one groove (22) is formed, in which at least one magnet (6) is housed by form-fitting and / or force-fitting.

10. Tubular lamp (1) according to any one of the preceding claims, characterized in that the inner face (21) comprises a coupling appendage (23) which projects towards the inner region (I) and which forms a pair of coupling notches (25a, 25b), said coupling appendage being capable of engaging with the pair of lateral flanks (40a, 40b), such that each lateral flank (40a, 40b) of said pair of lateral flanks (40a, 40b) engages with the respective coupling notch (25a, 25b) of said pair of coupling notches (25a, 25b).

11. Tubular lamp (1) according to the preceding claim, characterized in that the coupling appendage (23) is dovetail-shaped, or comprises a pair of hooks, and in that each lateral flank (40a, 40b) comprises a coupling foot (41a; 41b) projecting towards the internal region (I) and counter-molded with respect to the respective coupling notch (25a; 25b).

12. Tubular lamp (1) according to claim 1, characterized in that the lighting source (3) is a strip of light-emitting diodes comprising a power guide (31) and a plurality of light-emitting diodes (32), and in that the internal indentation (42a; 42b) is substantially aligned with the plurality of light-emitting diodes (32), or overhangs this plurality of light-emitting diodes (32) in the direction of the emission wall (41).

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