DE102014110993A1 - lighting device - Google Patents

Abstract

The invention relates to a lighting device with at least one semiconductor lamp (30) and a housing (10) made of plastic, in which the at least one semiconductor lamp (30) is accommodated, wherein the housing (10) has a housing lower part (11) and a translucent housing upper part (12), which projects in a connecting region at least partially into the housing lower part (11). The lighting device is characterized in that the upper housing part (12) and the lower housing part (11) are screwed together, wherein the upper housing part (12) and the lower housing part (11) locking means are present, which engage in one or more predetermined rotational positions and one Unscrew the housing upper part (12) from the lower housing part (11) counteract.

Description

The invention relates to a lighting device having at least one semiconductor lamp and a housing made of plastic, in which the semiconductor lamp is accommodated, wherein the housing comprises a lower housing part and a translucent housing upper part and wherein the upper housing part protrudes at least partially into the housing lower part in a connecting region.

Luminaires with semiconductor lamps are characterized by a high specific luminosity and thus low energy consumption and by a long life. In operation, the semiconductor bulbs must be cooled, since both the lifetime and the effectiveness achieved decreases with the temperature of the lamps. With the increasing light output of the semiconductor lamps and thus also increasing electrical power consumption, the demand for effective cooling of the semiconductor lamps is also increasing. In addition to the heat sink and semiconductor light-emitting means, a driver module for the semiconductor light-emitting means, which is also called a connection module, is frequently arranged in the housing of the lighting device and provides a current suitable for driving the semiconductor light-emitting means. Furthermore, an optical element, for example a reflector and / or a lens arrangement, is optionally provided to achieve a desired spatial radiation characteristic.

In particular, in the case of so-called retrofit lighting devices, the shape and with respect to the electrical connection known configurations of lighting devices, such as incandescent or fluorescent tubes are adapted, the lighting device and accordingly the housing in terms of shape and appearance must meet strict specifications. In previously known semiconductor light-emitting devices, this could only be achieved with a relatively complex structure that can be mechanically assembled. The manufacturing process of such known light-emitting devices is correspondingly complicated, which is reflected on the one hand in the price and on the other hand in an inadequate quality.

Usually, the housing of the lighting device comprises a translucent (translucent or transparent) housing upper part and an opaque housing lower part. It is desirable for visual and haptic reasons that the two housing parts as smooth as possible merge into one another and are connected to each other loadable.

From the publication WO 2012/020366 A1 For example, a semiconductor light emitting device with a two-part housing is known, wherein the upper housing part is formed hemispherical and translucent. A smooth transition between the housing parts is achieved in that the upper housing part at least partially protrudes into the lower housing part and is fixed in a manner not shown in the lower housing part.

It is an object of the present invention to provide a lighting device of the type mentioned, which is easy and inexpensive to install and in which there is a high rotational and tensile strength between the housing parts. In particular, in a lighting device with a socket with screw thread or with a bayonet base, it is important to the housing parts torsion and tensile strength to ally with each other to screw the lighting device and unscrew or plug.

This object is achieved by a lighting device having the features of the independent claim. Advantageous embodiments are specified in the dependent claims.

A lighting device according to the invention of the type mentioned above is characterized in that the upper housing part and the lower housing part are screwed together, wherein on the upper housing part and the lower housing part locking means are additionally provided which engage in one or more predetermined rotational positions and one unscrewing the upper housing part of the lower housing part counteract. In a further development of the lighting device can also be provided that counteract the locking means in the engaged state in the predetermined rotational position and a further screwing the upper housing part in the lower housing part. The screw provides a robust and circumferentially uniform connection of the two housing parts, but on their own does not provide the required rotationally fixed connection. However, this is given by the locking means, so that the combination of screw and locking means is particularly advantageous here.

In an advantageous embodiment of the lighting device, the lower housing part has in an upper region one or more inwardly facing threaded portions. These engage in corresponding, outwardly facing threaded portions, which are formed on a lower edge of the upper housing part.

Preferably, in the region of the threaded portions or below the region of the threaded portions in the lower housing part, at least one inwardly pointing latching projection is designed as a latching means. This is shaped and arranged so that it opens with at least one downwards Detent cut cooperates, which is recessed at the lower edge of the upper housing part as a locking means. The latching projection is located in the engaged rotational position in the latching cutout. The locking means engage preferably when the housing parts are completely screwed together.

In a further advantageous embodiment of the lighting device, a downwardly projecting spring tongue is formed on the lower edge of the upper housing part on one side of the at least one latching cutout, which is preferably arranged on the side of the latching cutout leading into the lower housing part when the upper housing part is screwed in. The spring tongue is pressed when screwing in just before the locking position by the locking projection upwards and then snaps back when it has passed the locking projection during insertion. In the engaged rotational position then the spring tongue is located with its free end on one side of the locking projection and prevents the unscrewing of the upper housing part.

In a further advantageous embodiment of the lighting device, a metallic base body is arranged within the housing, on which the semiconductor lamp is fixed, wherein the metallic base body is inserted into the lower housing part and is fixed by the upper housing part. The metallic base body serves as a carrier and at the same time constitutes a cooling element for the semiconductor light-emitting means, so that a good dissipation of the heat generated by the semiconductor light-emitting means during operation takes place. In this case, the surface of the base body preferably fits tightly against an inner surface of a wall of the housing in order to allow the best possible heat transfer.

The described lighting device can in particular be well designed as a retrofit lighting device, in which, for example, a look and a connection diagram of a conventional light bulb are imitated.

Embodiments of the lighting device according to the invention will be explained in more detail by means of figures. The exemplary embodiments illustrate further advantageous embodiments of the lighting device or components of the lighting device. The figures show:

1 to 3 in each case an embodiment of a lighting device in the retrofit style in schematic exploded views; and

4a to 4c in each case a sectional view of the housing of a lighting device in one embodiment in different states of assembly; and

5a to 5c different views of the upper housing part and the lower housing part of 4 shown housing.

In the 1 to 3 three different embodiments of an application according lighting device are each shown in a perspective exploded view. Identical or equivalent elements are identified in these and the following figures by the same reference numerals.

In all three illustrated embodiments, the lighting device is designed as a retrofit lighting device, that is, with respect to the electrical connection and the shape of known bulbs, in this case light bulbs with screw thread (E14 or E27), oriented. It should be noted that the features shown in this application can also be implemented in lighting devices with different shape and / or other connection sockets or connection options, including lighting devices that are not designed as retrofit lights. In part, the featured features are also used in other electronics applications that have no bulbs.

The lighting device has a housing 10 , which is a housing base 11 and an upper housing part mounted thereon 12 has, and one opposite the housing upper part 12 at the lower housing part 11 attached socket 13 , which serves to hold the lighting device in a socket and the electrical contact. It is a screw connection with additional locking means for connecting the housing base 11 and the housing top 12 intended. For this purpose, the parts in the connection area are configured correspondingly interlocking. By latching prevents the transmission between the upper housing part when transmitting a torque 12 and the lower housing part 11 can be unscrewed. In this way, the two housing parts 11 . 12 set against rotation to each other. The connection of the two housing parts 11 . 12 is related to the 4 and 5 described in more detail.

Except for the contacting surfaces on the base 13 are the individual parts of the case 10 made of plastic, preferably in an injection molding process. At least the upper housing part 12 is translucent, z. B. transparent or opaque, held to emit the light emitted by the lighting device. The upper housing part 12 can be advantageously prepared in a Spritblasverfahren.

In the case 10 is a base body 20 used, which is constructed in two parts in the cases shown here and a lower shell 21 and an associated upper shell 22 having. The base body 20 has a diverse function. It serves, for example, for holding a semiconductor light-emitting means 30 , below bulbs 30 called, on the upper shell 22 is attached. The attachment of the bulb 30 can be done in different ways, for example by gluing, screwing or riveting. In the in the 1 - 3 illustrated embodiments, the upper shell 22 at its top, on which the bulbs 30 is mounted, an integrally molded sleeve 221 on. The sleeve 221 represents a piece of pipe open on both sides, the lower end with the upper shell 22 is firmly connected. The sleeve 221 can after putting on the bulb 30 how to put a rivet to the light source 30 set. Alternatively, it is also possible in the sleeve 221 screw in a preferably self-tapping screw with which the light source 30 is determined. The chicken 221 allows the use of a screw even with very thin material thickness of the upper shell 22 , It can be provided, before screwing the screw from above with a punch force on the sleeve 221 apply, thereby changing the environment of the sleeve 221 on the top of the top shell 22 dents. The indentation in the upper scarf 22 has a spring effect and ensures a permanently elastic attachment of the bulb 30 ,

Next is the base body 20 made of a highly thermally conductive material, preferably a metal such as aluminum, and thus serves to dissipate heat from the lamp 30 produced heat. Both the lower shell 21 as well as the upper shell 22 are preferably produced in a Tefziehverfahren, which allows a cost-effective production with minimum wall thicknesses. Particularly preferred is the sleeve 221 already formed in the thermoforming process. The sleeve 221 is thus in the original molding process, with the upper shell 22 is brought into its basic form, trained. In this way, the sleeve 221 not only in one piece with the upper shell 22 formed, but also in a manufacturing step.

The lower shell 21 and the upper shell 22 are mechanically strong connected to each other, which also good heat conduction from the upper shell 22 on the lower shell 21 is given, so that also the lower shell 21 Heat from the bulb 30 record and forward or can give. Both elements, lower shell 21 and upper shell 22 , Are essentially rotationally symmetrical, wherein the connection of the two elements takes place together by a joint fit, possibly supported by locking means in the connection region, for example, formed in the connection region circumferential bead or notch.

Composed is the base body 20 essentially capsule-shaped, wherein in its inner cavity a connection module 40 is included. The connection module 40 serves the implementation of the over the pedestal 13 supplied AC power of the house-light network, so for example in the voltage range of 110 volts to 230 volts, in one to supply the bulb 30 suitable direct current.

According to the invention are base body 20 and the lower housing part 11 latched together. For latching is, for example, circumferentially on the housing base 11 a Rastwulst 211 formed, which under latching projections of the housing base 11 locks. The latching is designed so that a thermal expansion of the base body 20 , in particular the lower shell 21 of the base body 20 , no undue and material-destroying or tiring load on the housing base 11 exercises. This is a good thermal contact between the lower shell 21 and the lower housing part 11 given, so that within the lighting device resulting heat, inter alia, the lower housing part 11 is delivered. breakthroughs 212 are present, through the guide webs for receiving the connection module 40 protrude (cf. 5b ).

Next are down, towards the pedestal 13 , in the lower shell 21 Openings provided through the connecting wires 41 of the connection module 40 to the pedestal 13 passed through. In the upper shell 22 is also a breakthrough introduced by the electrical connection from the bulb 30 to the connection module 40 he follows. This can be done for example via a semiconductor light source 30 preassembled, for example, soldered, plug 42 respectively.

Like the embodiments of the 1 to 3 show, the bulb can 30 a flat carrier board 31 have, on the a plurality of lighting elements, here light-emitting diodes 32 (LEDs - light emitting diodes) are arranged. Such a designed light source 30 radiates substantially perpendicular to the surface of the carrier board 31 from, ie in the direction of the axis of symmetry (screw axis) of the lighting device. In order to achieve a radiation perpendicular to the axis of symmetry, is in the embodiments of the 1 and 3 an optical element 50 provided, seen in the emission direction behind the light source 30 is arranged and influences the emission characteristics of the lighting device. The optical element 50 is in the embodiments shown on the upper shell 22 assembled.

The optical element 50 is preferably also produced in a thermoforming metal element, due to the attachment to the Upper shell 22 or directly on the carrier board 31 also absorb and release heat. Alternatively, the optical element 50 also be made of plastic, wherein transparent and / or reflective components can be used.

In the embodiment of the 1 has the optical element 50 reflective surfaces 51 on, which are designed rotationally symmetrical funnel-shaped. The reflective surfaces 51 steer much of the light emitting diodes 32 emitted radiation radially outward. Central is the optical element 50 open so that another part of the radiation exits axially. In the embodiment of the 3 includes the optical element 50 a lens 52 that are axially in front of the light emitting diodes 32 is arranged. The Lens 52 here is a diverging lens, that of the light-emitting diodes 32 emitted radiation beam expands and thus widens the radiation in the radial direction. Because of its flat design, the lens can 52 can be advantageously designed as a Fresnel lens. It can also be optical elements 50 used, which are both reflective surfaces 51 as well as lenses 52 exhibit.

The components of the lighting device are designed with regard to a possible automation of the manufacturing process, in particular the process of assembling the lighting device. This includes, for example, that parts are easily accessible and orientable. Furthermore, connections between the parts are preferably snap-fit and / or latching and / or joining connections, which can particularly preferably be assembled in a common joining or latching direction, particularly preferably along the axis of symmetry of the lighting device which in the illustrated pedestals 13 also the direction in which the lighting device is screwed into a socket. in the context of the application, this direction is also referred to as the axial direction.

The three in the 1 to 3 illustrated lighting devices differ in the exact shape of their components, the external dimensions and the light output. Nevertheless, they all have a comparable basic structure. This makes it possible to produce a plurality of different light-emitting devices on the same production lines in an automated manner, without the need for a model change to make profound changes to the production line or the production process. It creates a kind of modular system of design solutions that can be quickly responded to market requirements and small changes in the components, such as new bulbs. New developments can be flexibly and quickly integrated into new products.

In the 4 and 5 is the connection between the lower housing part 11 and the upper housing part 12 shown in more detail. It is understood that an assembly of the housing parts 11 . 12 only takes place in the manufacturing process, if inner assemblies such as the base body 20 with the included connection module 40 and the mounted light source 30 in the lower housing part 11 are used. These assemblies are in the 4 and 5 for the sake of clarity not shown.

The 4 shows the connection process in three sectional views, where in the 4a the lower housing part 11 and the upper housing part 12 initially separated from each other. For connecting both parts of the housing 10 has the lower housing part 11 in the area of its upper, open edge inwardly facing threaded sections 111 on. From these threaded sections 111 are along the inner circumference of the housing base 11 in the illustrated embodiment, three thread sections slightly overlapping along the circumference 111 arranged. The number of threaded sections 111 may alternatively be larger or smaller than those shown here. Below the area where the threaded sections 111 are formed, in this case two in each case inwardly facing latching projections 112 educated. Again, the number of locking projections 112 vary in alternative embodiments.

The upper housing part 12 is open at the bottom and has a peripheral edge on which also threaded sections 121 are formed. The threaded sections 121 are formed on the upper housing part as short webs, in particular in 5a easy to recognize. The threaded sections 121 of the upper housing part engage in the threaded sections 111 of the lower housing part to housing upper part 12 and housing base 11 to screw together. In 4b is the upper housing part 12 on the lower housing part 11 put on so that the threaded sections 111 . 121 for screwing together. In the screwed state, in the 4c is shown, the upper housing part sits 12 with a support edge 124 on an upper thickened edge area 113 of the housing base 11 on. The Auflagerand 124 and the thickened edge area 113 are adapted to each other so that the smoothest possible transition between the two housing parts is given.

At the bottom of the housing top 12 are opposite two downwardly open locking cutouts 122 spared. The locking cutouts are substantially rectangular, with one side down to a slightly protruding spring tongue 123 is arranged. When screwing the housing upper part 12 in the lower housing part 11 hurries the spring tongue 123 the cutout 122 ahead. Just before screwing in the 4c shown state is reached, sets the spring tongue 123 on the locking projection 112 of the housing base 11 on. Upon further rotation of the upper housing part 12 opposite the lower housing part 11 becomes the spring tongue 123 bent upwards before entering the in 4c shown rotational position, the upper rear (in rotary motion of the spring tongue 123 seen from) corner of the locking projection 112 has reached and springs down. It then lies with its free end on one side of the locking projection 112 at. Turning back the upper housing part with respect to the lower housing part 11 is in the locked state of 4c not possible anymore.

In addition, the spring tongue lies 123 opposite side of the locking cutout 122 on the other side edge of the locking projection 112 at or is located at least just before this side edge. In the in 4c shown latched position is thus also a further screwing the housing upper part 12 in the lower housing part 11 prevented by the latching. In this way, in addition to the placement of the Auflagerands 124 on the upper thickened edge area 113 achieved in this direction of rotation non-rotatable connection between the two housing parts.

In the 4 and 5 are still leaders 114 recognizable in the lower part of the housing base 11 are formed. These guide bars 114 serve to accommodate the connection module 40 that with a printed circuit board in these guide bars 114 can be inserted. To enable the insertion, the metallic base body 20 , which is the connection module 40 receives and at its top the semiconductor light source 30 carries, corresponding recesses on its side walls. Furthermore, in the 5b breakthroughs 115 for the passage of the connecting wires 41 of the connection module 40 to recognize.

LIST OF REFERENCE NUMBERS

10

casing

11

Housing bottom

111

threaded portion

112

catch projection

113

supporting edge

114

guide web

115

breakthrough

12

Housing top

121

threaded portion

122

Rest Neck

123

spring tongue

13

base

20

base body

21

subshell

211

latching bead

212

breakthrough

22

Upper shell

221

shell

30

Semiconductor lighting products

31

carrier board

32

LED (LED)

40

connection module

41

Lead wire

42

plug

50

optical element

51

reflective surface

52

lens

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• WO 2012/020366 A1 [0005]

Claims (12)

Lighting device with at least one semiconductor lamp ( 30 ) and a housing ( 10 ) made of plastic, in which the at least one semiconductor lamp ( 30 ), wherein the housing ( 10 ) a housing lower part ( 11 ) and a translucent upper housing part ( 12 ), which in a connection region at least partially into the housing lower part ( 11 ), characterized in that the upper housing part ( 12 ) and the housing lower part ( 11 ) are screwed together, wherein on the upper housing part ( 12 ) and on the lower housing part ( 11 ) Locking means are present, which engage in one or more predetermined rotational positions in one another and unscrewing the housing upper part ( 12 ) from the lower housing part ( 11 ) counteract. Lighting device according to claim 1, wherein the latching means in the engaged state in the predetermined rotational position and a further screwing the housing upper part ( 12 ) in the housing lower part ( 11 ) counteract. Lighting device according to claim 1 or 2, wherein in an upper region of the housing lower part ( 11 ) one or more inwardly facing threaded portions ( 111 ) are formed. Lighting device according to claim 3, in which in the region of the threaded portions ( 111 ) or below the area of the threaded sections ( 111 ) in the lower housing part at least one inwardly pointing locking projection ( 112 ) is designed as a latching means. Lighting device according to one of claims 1 to 4, wherein at a lower edge of the housing upper part ( 12 ) one or more outwardly facing threaded portions ( 121 ) are formed. Lighting device according to one of claims 1 to 5, wherein at the lower edge of the upper housing part ( 12 ) at least one downwardly open latching cutout ( 122 ) is omitted as locking means. Lighting device according to claim 6, wherein at the lower edge of the upper housing part ( 12 ) on one side of the at least one latching cutout ( 122 ) a downwardly projecting spring tongue ( 123 ) is trained. Lighting device according to claim 7, wherein the spring tongue ( 123 ) at the screwing in the housing upper part ( 12 ) in the housing lower part ( 11 ) leading side of the cutout ( 122 ) is arranged. Lighting device according to claim 4 and 6, wherein the latching projection ( 112 ) in the engaged rotational position in the latching cutout ( 122 ) lies. Lighting device according to claim 7 and 9, wherein the spring tongue ( 123 ) in the engaged rotational position with its free end on one side of the latching projection ( 112 ) is present. Lighting device according to one of claims 1 to 10, wherein inside the housing ( 10 ) a metallic base body ( 20 ) is arranged, on which the semiconductor lamp ( 30 ), wherein the metallic base body ( 20 ) in the housing lower part ( 11 ) is inserted and from the upper housing part ( 12 ). Lighting device according to one of claims 1 to 11, which is designed as a retrofit lighting device.

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