EP2871411B1 - Optical element for a lamp, and lamp - Google Patents

Description

The invention relates to an optical element for a lamp, in particular an LED lamp (LED: light-emitting diode), and a lamp with such an optical element.

From the prior art, a grid lamp is known, which comprises a plurality of grid cells or short cells, from which emerges the light emitted by the lamp light. With such a lamp light is emitted selectively over the cell areas, wherein the cells extend distributed over a total of a larger total area of time.

In order to achieve a suitable glare of emerging from a cell light in a grid lamp, it is necessary to use a lens and a reflector. For this purpose, a corresponding lens is known, which has an approximately truncated pyramid or truncated cone-like shape, wherein a recess is provided, which is designed to receive an LED or a group of LEDs. At the side opposite this recess, the lens has a curved surface on which the light emitted by the LED or the LED group undergoes a refraction. The lateral areas of the frustoconical lens element are used for total reflection of the light.

However, to achieve a desired glare, as mentioned, a reflector is required in addition to the lens.

From the WO 03/048637 A1 For example, a lighting module with an optical body and a supporting structure is known. The support structure includes support members formed integrally with the optical body.

From the WO 2013/142437 A1 For example, an LED luminaire with a lens element and a masking element is known. The light emitted by the LED becomes first influenced by the lens element and then reflected on the masking element.

The invention has for its object to provide a corresponding, improved optical element for a lamp; in particular, the optical element should enable cost-effective production. Furthermore, a luminaire is to be specified with such an optical element.

This object is achieved according to the invention with the objects mentioned in the independent claims. Particular embodiments of the invention are indicated in the dependent claims.

According to the invention, there is provided an optical element for a luminaire having at least one lens element made of a first material and a holding element made of a second material, the second material differing in optical properties from the first one Material is different. In this case, the at least one lens element and the holding element are designed integrated such that the optical element is in one piece.

The holding element opens up the possibility of realizing a reflector function of the optical element, with the integrally formed design enabling a manufacturing-technically advantageous one-piece design together with the at least one lens element. In addition, due to the integrated design, the optical element can be designed as an effective contact protection element for the luminaire.

Preferably, the first material and the second material are using the same base material, for example polycarbonate. Alternatively, the first material is preferably formed using a first base material, for example polymethylmethacrylate, and the second material is formed using a different second base material, for example polycarbonate. Such a choice of material makes it possible to achieve particularly advantageous suitable optical properties of the optical element.

Preferably, the optical element consists only of the at least one lens element and the holding element. As a result, a facilitated production of the optical element is made possible.

Preferably, the at least one lens element and the holding element via an adhesive connection and / or a positive connection held together. This allows a particularly suitable cohesion of said components.

Preferably, the holding element is formed by encapsulation of the at least one lens element. This allows a further facilitated production. Alternatively, also advantageous manufacturing technology, the optical element is produced by a two-component injection molding process.

Preferably, the at least one lens element is optically clear; the holding element preferably has a white surface. By this design, a particularly high photometric efficiency of the optical element can be achieved.

According to the invention, the at least one lens element has a light entry side and, opposite thereto, a light exit side, wherein in particular the light entry side has a concave curvature for receiving at least one LED. This is photometrically advantageous.

According to the invention, the holding element is a reflector element and the optical element is designed such that a light entering via the light entry side can leave the at least one lens element via the light exit side and subsequently impinges on the reflector element. This makes it possible to realize a particularly suitable reflector function of the optical element.

In this case, the optical element is preferably designed in such a way that an additional light entering via the light entry side can leave the at least one lens element via the light exit side, without subsequently impinging on the reflector element. This is advantageous with respect to the lighting efficiency of the optical element.

Preferably, the optical element is pot-shaped, in particular as a cover for the lamp. As a result, the optical element can be designed particularly suitable as a contact protection element of the lamp.

Preferably, the retaining element has latching elements, in particular for a latching connection with an LED board of the lamp or a housing of the lamp. This allows a particularly easy to produce mechanical connection of the optical element with the LED board or the housing of the lamp.

According to a further aspect of the invention, a luminaire is provided, which has an optical element according to the invention, and at least one LED, which is arranged such that a light generated by the at least one LED enters the at least one lens element, in particular without prior interaction with one another optical element.

Preferably, the lamp further comprises a board, wherein the at least one LED is arranged on the board and the board is connected via a latching connection with the optical element.

Preferably, the optical element forms a cover of the lamp.

Fig. 1

eine perspektivische Skizze eines erfindungsgemäßen optischen Elements,

Fig. 2

eine Querschnitt-Skizze durch einen Ausschnitt von Bestandteilen einer Leuchte mit dem optischen Element und

Fig. 3

eine perspektivische Detail-Skizze zur Verbindung zwischen dem optischen Element und der LED-Platine der Leuchte.

The invention is explained in more detail below with reference to an embodiment and with reference to the drawings. Show it:

Fig. 1

a perspective sketch of an optical element according to the invention,

Fig. 2

a cross-sectional sketch through a section of components of a lamp with the optical element and

Fig. 3

a perspective detail sketch for the connection between the optical element and the LED board of the lamp.

Fig. 1 shows a perspective sketch of an embodiment of an optical element according to the invention. The optical element is designed to be used as part of a luminaire, in particular for influencing a light emitted by LEDs which form a light source of the luminaire. there it can be provided that the optical element is the only effective optical element of the luminaire for influencing the light emitted by the LEDs.

The optical element comprises at least one lens element 1, in this case a plurality of lens elements 1 and a holding element 2. For example, the optical element may have a total of more than five or more than ten lens elements 1.

The lens elements 1 consist of a first material and the holding element 2 of a second material, wherein the second material differs from the first material in its optical properties.

Advantageously, it can be provided that the first material and the second material are formed using the same base material; the base material may in particular be polycarbonate. In this case, the first material can be, for example, clear or transparent or translucent polycarbonate and the second material can be a treated polycarbonate, for example a colored or coated polycarbonate, so that the second material is not translucent or opaque.

Alternatively, for example, it may be provided that the first material is formed using a first base material, for example polymethylmethacrylate, and the second material is formed using a different second base material, for example polycarbonate.

Each of the lens elements 1 is designed to affect the light of one or more of the LEDs of the luminaire. The lens elements 1 are preferably in each case annularly surrounded by the holding element 1, such that the holding element 2 forms a holding framework for the lens elements 1.

The at least one lens element 1 and the holding element 2 are designed so integrated that the optical element is in one piece.

In the example shown here, the optical element consists only of the at least one lens element 1 and the holding element 2. The at least one lens element 1 and the holding element 2 are held together via a material connection and / or a positive connection.

In this way, the optical element is a one-piece or integrally formed component of the luminaire, which can be produced advantageously and allows easier assembly of the luminaire.

A particularly suitable production is made possible, for example, if the holding element 2 is formed by encapsulation of the at least one lens element 1. For this purpose, the at least one lens element 1 can first be arranged in a corresponding injection molding tool and then the holding element 1 can be produced by injection molding with the aid of this injection molding tool. Alternatively, the optical element may be made, for example, by a two-component injection molding process. In this case, preferably the first and the second material form the two components.

The first material of which the at least one lens element 1 is made may be, for example, polymethylmethacrylate (PMMA), the second material may be polycarbonate. In this case, in terms of lighting technology, the at least one optical lens element 1 is preferably optically clear. The holding element 2 may advantageously have a white surface in terms of lighting technology; Preferably, the holding element 2 is made opaque. This makes it possible to achieve that the holding element 2 has suitable reflector properties.

As in the example shown, the case, the optical element is preferably designed overall pot-shaped. For example, it may comprise a first part 81, through which a bottom part of the pot shape is formed and a second part 82, through which a particular annular circumferential side wall portion of the pot shape is formed. In the example shown, the at least one lens element 1 is designed only as a bestsand part of the first part 81.

Fig. 2 shows in a section of a cross-sectional sketch of components of a lamp according to the invention with the optical element. In particular, the lamp includes an LED board 4 or short board 4, are arranged on the LEDs 3, which form a light source of the lamp. In this case, the design is such that a light generated by the LEDs 3 is optically influenced by the optical element.

In the example shown here, the lens elements 2 are advantageously arranged so that they all pass through a common plane E.

The first part 81 of the optical element may be shaped to comprise or consist of a plate-shaped portion 815, the shape of which defines another plane E ', which is preferably oriented parallel to the first plane E, and at least a cell region 7, in this case a plurality of cell regions 7, each of the cell regions 7 comprising exactly one of the lens elements 1. The cell regions 7 are designed such that they are designed to lift out of the plane E ', in such a way that they pass through the first-mentioned plane E , in particular with the respectively associated lens element 1. By the cell regions 7 can advantageously cells in Sense of a grid light be formed.

Further preferably, the first part 81 of the optical element comprises at least one annular region 816, in this case a plurality of annular regions 816, wherein each of the cell regions 7 comprises exactly one of the annular regions 816. The at least one annular region 816 is preferably designed as part of the retaining element 2.

Each cell region 7 thus comprises exactly one of the lens elements 1, as well as exactly one of the annular regions 816. The annular region 816 of a cell region 7 is annularly formed surrounding the associated lens element 1. This annular region 816 is preferably designed with an inwardly-facing surface, with respect to the ring shape, which is reflective for light, so that a reflector for the respective cell region 7 is formed by the annular region 816. For a particularly suitable reflector function, this inwardly facing surface of the annular region 816 is preferably designed such that it is formed to be divergent in the direction of the plane E '. Further preferably, the extends Ring area 816 up to the plane E 'and in the latter forms an edge region of an opening of the respective cell area 7, which is provided for the passage of light. The opening or the edge region forming the opening can, for example, be circular, or to a first approximation rectangular, preferably square in shape.

Manufacturing technology advantageous, the entire holding element 2 is designed as a reflector element.

Preferably, the annular region 816 of a cell region 7 surrounds the relevant lens element 1 in a ring-shaped closed manner and contacting on all sides, so that no passage opening is formed between the lens element 1 and the adjacent annular region 215. In particular, the design is such that the annular region 816 in the plane E forms a further opening which is closed by the relevant lens element 1. This is due to the annular contact area between the annular region 816 on the one hand and the lens element 1 on the other hand both advantageous with respect to the cohesion between the lens element 1 and the holding element 2, as well as advantageous with respect to the optical properties of the cell region. 7

Due to the pot shape, the optical element is particularly suitable to be designed as a cover for the lamp. In addition, it can be achieved by this design that the optical element forms a contact protection element for the lamp, are protected by both the LEDs 3 from accidental contact, as well as a user of the lamp against accidental contact of the LEDs 3 and the board 4, on which the LEDs 3 are arranged, is protected. This is relevant since an LED board can generally have live parts, which are subjected to a voltage of 230 V, for example.

The at least one lens element 1 can in principle be shaped as it is known from the prior art described at the outset. Preferably, it has a light entry side 15 and, opposite thereto, a light exit side 16. In this case, the light entry side 15 preferably has a concave curvature or a recess for receiving at least one of the LEDs 3 of the luminaire.

As in Fig. 2 indicated by an exemplary light beam L1 , the optical element is preferably designed so that a light L1 entering via the light entrance side 15 can leave the at least one lens element 1 via the light exit side 16 and subsequently onto the retaining element designed as a reflector element 2. Element 2, in particular impinges on the corresponding annular region 816 of the holding element 2, in particular such that it is reflected there and furthermore leaves the relevant cell region 7 and the light as a whole. In this way, it can be achieved that light beams which leave the light exit side 16 of the lens element 1 with respect to the plane E ' at flat angles are reflected. As a result, it can be particularly effectively avoided that the light emerging from the cell region 7 leads to undesired glare of a viewer of the luminaire.

Furthermore, in terms of lighting technology, the optical element is furthermore designed in such a way that, as indicated by another exemplary light beam L2 , a further light L2 entering via the light entry side 15 can leave the at least one lens element 1 via the light exit side 16, without Element 2 or another part of the lamp, especially without impacting the ring area 816 concerned. This is advantageous with respect to the efficiency of the luminaire.

The cell areas 7 are preferably all of identical design.

Fig. 3 shows a perspective detail sketch according to a variant. The reference numerals are used in an analogous manner to above. As is apparent from this drawing, the optical element preferably has latching elements for a latching connection V to the LED board 4 of the lamp. The LEDs 3, which are arranged in the recesses of the lens elements 1, are preferably LEDs 3 of this LED board 4. Preferably, the LED board 4 is arranged in the lamp parallel to the plane E oriented, in particular on one, the plane E. 'opposite side of the plane E.

As again from the sectional view of the Fig. 2 shows, the design is preferably such that the LED board 4, the lens elements 1 contacted, in particular at the edges of the recesses of the light entry sides 15 contacted. In this way it can be achieved that the optical element, when it is connected via the latching connection V to the LED board 4, forms a particularly effective touch protection element for the LEDs 3.

In particular, the design is such that the light emitted by the LEDs 3 of the LED board 4 enters the lens elements 1 without being previously influenced by another optical element.

The second part 82 of the optical element, through which the annular peripheral side wall region is formed, can likewise have latching elements for connection to at least one further component of the luminaire, in particular on an edge region of the side wall region facing away from the plane E ' . The further component of the luminaire may, for example, again be the LED board 4 or a housing of the luminaire. Preferably, the side wall portion extends from the plane E 'to the plane E, in particular such that it passes through the plane E in a ring-shaped closed manner.

An optical element according to the invention can be produced particularly inexpensively; Moreover, a particularly suitable contact protection for the luminaire can be formed with the optical element. In this case, can be achieved with a lamp, which is provided with an optical element according to the invention, a light output as with a conventional grid lamp.

Claims (14)

1. Optical element for a light, comprising

   - at least a lens element (1) consisting of a first material, and

   - a holding element (2) consisting of a second material, wherein the second material is different from the first material in its optical properties,

   wherein the at least one lens element (1) and the holding element (2) are so integrated in design that the optical element is in one piece,
   wherein the at least one lens element (1) comprises a light inlet side (15) and an opposing light outlet side (16),
   characterized in that
   the holding element (2) is a reflector element and the optical element is so designed that a light (L1) entering via the light inlet side (15) can exit the at least one lens element (1) via the light outlet side (16) and, in addition, is incident to the reflector element.
2. Optical element according to claim 1,
   wherein the first material and the second material are formed using the same base material, such as polycarbonate, or
   wherein the first material is formed using a first base material, such as polymethyl methacrylate, while the second material is formed using a different second base material, such as polycarbonate.
3. Optical element according to claim 2,
   which only consists of the at least one lens element (1) and the holding element (2).
4. Optical element according to one of the preceding claims,
   wherein the at least one lens element (1) and the holding element (2) are held together via a material-locking connection and/or a form-locking connection.
5. Optical element according to one of the preceding claims,
   wherein the holding element (2) is formed through injection molding of the at least one lens element (1).
6. Optical element according to one of the claims 1 to 4,
   which is produced through a two-component injection molding process.
7. Optical element according to one of the preceding claims,
   wherein the at least one lens element (1) is optically clear and/or the holding element (2) has a white surface.
8. Optical element according to one of the preceding claims,
   wherein the light inlet side (15) has a concave curvature to receive at least one LED (3).
9. Optical element according to one of the preceding claims,
   which is also so designed that a further light (L2) entering on the light inlet side (15) can leave the at least one lens element (1) on the light outlet side (16) without further impinging on the reflector element.
10. Optical element according to one of the preceding claims,
    which is pot-shaped in form, in particular as a cover for a luminaire.
11. Optical element according to one of the preceding claims,
    wherein the holding element (2) has latching elements, in particular for a latching connection with an LED board (4) of the luminaire or a housing of the luminaire.
12. Luminaire comprising

    - an optical element according to any one of the preceding claims, and

    - at least one LED (3),

    which is so arranged that a light generated by the at least one LED (3) enters the at least one lens element (1), in particular without previous interaction with a further optical element.
13. Luminaire according to claim 12, further comprising

    - a circuit board (4), wherein the at least one LED (3) is disposed on the board (4), and the board (4) is connected to the optical element via a locking connection (V).
14. Luminaire according to claim 12 or 13,
    wherein the optical element forms a cover of the luminaire.

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