DE102010019136A1 - Light i.e. LED for use in dental instrument e.g. hand piece, has heat sink in thermal connection with LED chip, where heat sink receives heat generated by LED chip and dissipates received heat to environment - Google Patents

Abstract

The light i.e. LED (10) has an LED chip for generating and radiating light, and a lens (26) for focusing and directing the light generated by the LED chip. A heat sink (34) is in thermal conductive connection with the LED chip, where the heat sink receives heat generated by the LED chip and dissipates the received heat to the environment. A silver-based thermal compound is provided between the LED chip and the heat sink, where the heat sink is formed within a housing (32). An independent claim is also included for a component of a dental instrument comprising a socket.

Description

The invention relates to a light source for a dental instrument or a component thereof. Moreover, the invention relates to a component of a dental instrument.

Dental instruments are used to handle dental tools. These include, in particular, drills, grinders, suckers and the like. Accordingly, there are dental instruments in different designs and with different components or components, also mostly manufacturer-specific versions. These instruments or their components serve to receive the tools, connect them to the corresponding supply devices, if necessary to drive them, etc. In addition, the instruments should have a shape that is easy to handle for the treating person.

In order to optimally illuminate the work area, in particular in the mouth of a person to be treated, light sources or light sources are installed in the instruments. Usually this conventional incandescent lamps, but also halogen lamps, such as in particular xenon lamps are used. In order to ensure a slight change of the illuminant, the instruments and the illuminants have corresponding mutually corresponding connectors.

A disadvantage of the conventional bulbs is that they on the one hand have a relatively high power consumption and on the other hand have only low lifetimes. Alternatively, LEDs are now also used as a light source or light source. Although currently available light-emitting diodes have good spectral properties and sufficiently high luminance. However, they have the disadvantage that the small LED chips themselves heat up strongly and thus either can not be used in a confined space or only with a short life.

Object of the present invention is to provide a light source based on a light emitting diode or a light emitting diode for a dental instrument, which overcomes the disadvantages of the prior art, in particular a sufficient heat dissipation of light sources or guaranteed by the light emitting diode and also easy to handle.

This object is achieved by a lamp with the features of claim 1. Such a light source, in particular a light-emitting diode, for a dental instrument accordingly has at least one light source, such as in particular a light-emitting diode chip for generating and / or emitting light, and optics, such as preferably a lens, a light guide or the like, for guiding, focusing and / or for the directed radiation of the light generated by the LED chip. The light-emitting diode chip is thermally conductively connected to a heat sink, so that heat generated or emitted by the light-emitting diode chip can be absorbed by the heat sink and / or can be emitted or dissipated from the heat sink to the environment of the heat sink. By the heat emission of the LED chip to the heat sink or with the help of the same to the environment sufficient cooling of the LED chip is ensured. Thus, this is operable even at relatively high power. In particular, the necessary luminance for the intended applications of the working field illumination is thus achieved. The illuminant can be installed in particular in a dental instrument, in particular in a handpiece, elbow or coupling piece.

Preferably, the lighting means has a housing. The housing serves in particular as an outer boundary or wall of the lighting means. Preferably, all the essential components of the luminous means are arranged on or in the housing or connected thereto. Thus, a compact and easy to handle light source is created. Particular preference may also individual components of the lamp form a part of the housing. In particular, the heat sink is at least partially a component or part of the housing. Preferably, the heat sink forms part of the outer wall of the housing. This offers the advantage that an at least substantially direct heat emission through the heat sink to the environment or to surrounding components, in particular to parts of a dental instrument, is made possible. Preferably, the housing is at least partially formed of plastic. A compact housing also allows a direct replacement of a conventional bulb against a lighting device according to the invention. The heat sink is preferably at least substantially cylindrical. The side wall of the heat sink is further preferably designed as a substantially smooth surface. Alternatively, however, the side surface may also have, for example, cooling fins or the like. The heat sink is further preferably at least substantially solid. Alternatively, the heat sink itself may be sleeve-shaped. In particular, a preferably additional sleeve, in particular metal sleeve, can be provided which at least partially surrounds the heat sink and / or other constituents of the housing or of the luminous means.

The housing of the illuminant is particularly preferably pluggable, plug-like, or as Plug formed. Further preferably, the housing and / or a preferably associated with the housing base portion or base is at least partially made of a non-conductive material, in particular made of plastic. The base or base section serves as part of the connector. The housing or part of the housing, in particular the base / base portion is connected to the heat sink, in particular by gluing, preferably by synthetic resin. This ensures a high durability.

The heat sink is preferably formed at least partially from a heat-conducting material and / or at least partially from a material with high heat capacity. As such materials, in particular metals, preferably copper come into consideration. This ensures the desired thermal properties combined with good stability. More preferably, the heat sink is at least partially metal-coated, in particular gold, silver and / or platinum coated. This ensures a good or high-quality surface quality, in particular low thermal or optionally electrical line resistance and preferably a good resistance to acting, in particular aggressive media.

Particularly preferably, the light-emitting diode chip, in particular an electrically insulating component thereof, preferably the (insulating or non-electrically conductive) substrate of the light-emitting diode chip is in contact with the heat sink. However, the contact is preferably thermally conductive. This ensures that waste heat of the LED chip can be delivered to the heat sink. More preferably, the LED chip is arranged or attached to or on the heat sink. Thus, a durable durable or secure connection can be made. To improve the heat conduction or the durability, a heat-conducting material is preferably provided in the region between the light-emitting diode chip and the heat sink. The heat-conducting material is preferably a particular metallic, more preferably silver-based thermal paste, a corresponding (heat-conducting) adhesive or another suitable material. The heat-conductive material preferably has a thermal conductivity of at least 1 W / m · K, more preferably at least 10 W / m · K, particularly preferably at least 30 W / m · K.

More preferably, the lighting means has at least one connection means, in particular connection leg for at least electrical, possibly also thermal contacting of the light-emitting diode chip. Accordingly, the connection means is preferably at least partially formed from an electrically conductive or electrically conductive material. Preferably, the connection means is at least partially disposed within the heat sink and / or the housing. The connection means is in particular electrically and / or thermally isolated from the heat sink and / or the housing. More preferably, the connection means for this purpose in particular sections, preferably fully embedded in particular electrically and / or thermally insulating material. Preferably, these are glass and / or glass frit or frit glass, in the latter case, glass baked together from small glass chunks at low temperatures. The insulating material is preferably arranged in the region of the heat sink, in particular in the interior of the heat sink, preferably surrounding the connection means. This is particularly preferably carried out such that at least almost complete electrical and / or thermal insulation of the connection means with respect to the heat sink takes place. As a result of the embodiments described here, it is achieved in each case that a compact luminous means is ensured with simultaneously good conduction or insulation properties of the connection means.

In particular, the or the connecting means has at least one, preferably a plurality of conductor sections. The at least one conductor section is preferably formed at least partially of conductive material, in particular metal. For this purpose, preferably at least one first conductor section is in particular connected directly and / or preferably fixedly to the light-emitting diode chip. The conductor section is or the connection takes place in particular electrically and / or thermally conductive. The first conductor section is particularly preferably metal-coated, in particular silver-coated. More preferably, at least a second conductor section is provided. This is in particular metal-coated, preferably magnesium-coated. The second conductor section is preferably provided for connecting in particular to a power source in a detachable manner. Preferably, the connection is electrically and / or thermally conductive. In particular, by providing a plug connection as a releasable connection, a simple exchange of the lighting means is ensured. More preferably, a plurality of the conductor sections, in particular the first conductor section are connected to the second conductor section of the connection means, preferably permanently. The interconnected conductor sections are preferably soldered together and / or welded, preferably by arc welding, in particular arc welding. The training provided here allow a high conductivity and long life of the connection means. In particular, the connection means has an elongated shape at least in sections. More preferably, the connection means is at least partially needle-shaped, rod and / or wire-shaped. In particular, comes a (hollow) cylindrical design into consideration, preferably for coaxial connections. In order to enable a high stability and contact security, the connection means is at least substantially rigid.

The heat sink preferably has at least one bore, in particular a plurality of bores. The at least one bore preferably extends from a first end face to a second end face of the heat sink that is substantially opposite to the first end face. The end faces in particular run parallel to one another. More preferably, it is essentially straight through holes, wherein the bore extends at least almost perpendicular to the end face. Each or almost every hole is preferably associated with a connection means. Such a connection means preferably passes completely through the respective bore. In particular, it projects out of the bore at least on one side, so that, for example, a contacting or plug connection can take place there. On the side of the light-emitting diode chip, the connection means preferably terminates substantially flush with the end face of the heat sink, on which the light-emitting diode chip is arranged. Thus, the chip can be contacted with the heat sink. The passage of the connection means through the holes of the heat sink allows a particularly compact construction of the light source with good heat dissipation.

The light-emitting diode chip preferably has a plurality of, in particular two electrodes or connections. As a rule, it is in each case the cathode or the anode of the LED chip associated electrodes. Depending on the type of connection of the luminous means electrically with a power supply, in particular current source, or mechanically with a dental instrument or the like, different contacts of the electrodes or connections come into consideration. For example, one of the electrodes or connections with one of the connection means, the housing, the heat sink or even several of them may be in electrically and / or thermally conductive connection. Thus, for example, a single connection means may be formed as a first electrical conductor, while an electrically conductive housing or the heat sink serves as a second conductor for powering the LED chip. As a rule, however, two separate connection means are used for this purpose.

The optics, in particular a lens, a light guide and the like are preferably arranged facing the light-emitting diode chip. In particular, the optics is preferably in direct contact with the light-emitting diode chip, wherein the optic is furthermore preferably placed or laid directly on the light-emitting diode chip. In order to ensure a particularly good light emission, the optics is placed in particular on the active or light-emitting surface of the LED chip. The arrangement is in particular centric, preferably with an at least substantially flat part of the optics. Thus, preferably, a center or a central part of the optics substantially coincides with a center or a central part of the light-emitting surface. In particular, the lens is convex, such that a focus and good illumination can be achieved. In particular, the optics, preferably the lens of the luminous means is essentially formed of silicone. This is a particularly cost-effective and durable material. The lens particularly preferably has an outwardly curved or convex side or lens surface and more preferably a substantially flat or planar side or lens surface. The latter is preferably placed on the LED chip facing or placed on the LED chip. An optic designed, for example, as an optical waveguide or waveguide (such as a glass fiber, plastic fiber or the like) may preferably also be arranged facing the light-emitting diode chip with an end-side end region. In order to improve the optical connection between the optics and the LED chip, further, for example, a suitable material (for example an immersion liquid or the like) may be provided for the calculation index adaptation between the LED chip and the optic.

The heat sink and / or the housing is or are formed in a preferred embodiment, at least substantially cylindrical. In this case, the heat sink and / or the housing has or have essentially flat end faces. More preferably, the housing is arranged with an end face on or on a first end face of the heat sink. The LED chip is arranged in particular with a preferably substantially flat surface on or on an end face of the heat sink. Preferably, the two end faces of the heat sink are thus arranged so that on one side of the LED chip and on the other side of the housing is arranged. In particular, the heat sink and / or the housing and / or the optics and / or the light-emitting diode chip are arranged axially or concentrically / coaxially to one another. This overall ensures an elongated and preferably substantially cylindrical design of the luminous means. Preferably, the heat sink, the housing, the LED chip and / or the optics, etc., at least substantially coinciding or common longitudinal central axes.

Based on the object mentioned above, a corresponding improvement in the properties of a dental Instrument or component of a dental instrument achieved by an improved light source.

This object is achieved by a component of a dental instrument having the features of claim 12. Accordingly, a component of a dental instrument has at least one component housing and at least one luminous means according to the above explanations. The illuminant is used in particular for illuminating the working area of the dental instrument. The use of a light-emitting diode based as described above ensures longevity with low power consumption and thus comparatively low operating costs compared to conventional bulbs. The dental instrument or its component or component housing can in turn have further constituents. These include in particular a drive piece and / or coupling piece, which in particular has a drive, such as a motor, a turbine, etc., or is connected to such, for example by a shaft, a housing, a gear or the like. In addition, with the drive piece or coupling piece typically a handle piece can be connected, in particular detachably, preferably as a latching connection or plug connection. This handle can be configured, for example, as a (straight) handpiece, as an angled piece (also angled) or as a so-called turbine. The handle receives the actual tool, preferably by a arranged at an end portion tool holder. To be able to transmit, for example, a rotational movement of a drive of the drive piece or coupling piece to the tool or the tool holder, the handle has a corresponding mechanism, in particular a transmission mechanism, for example, a transmission, a shaft or the like.

Preferably, the light source is exchangeably arranged on or in a receptacle of the component housing and / or connected to the component housing. In particular, a plug-in connection or latching connection suitable for holding and / or supplying power to the luminous means is used for connection. For this purpose, a first part of the plug connection, in particular a socket, is preferably assigned to the component or the component housing. Meanwhile, in particular, a second, preferably with the first part of the connector corresponding part of the connector, in particular a plug, the illuminant itself assigned. Alternatively, the assignment of plug and socket can also be done in the reverse manner. Even identical, but still mutually corresponding or combinable parts of the connector can be provided on the handpiece and lighting. This results overall in a simple and fast interchangeability, for example, defective bulbs.

More preferably, at least part of the waste heat produced by the luminous means or its light-emitting diode chip can be accommodated at least from a part of the component housing, in particular the receptacle of the component housing. The waste heat can preferably be delivered to the heat sink of the light source. For this purpose, a thermally conductive contact between the heat-emitting component of the lamp, in particular the heat sink, and the heat-absorbing component of the component housing or the component is preferably required and / or provided. To improve the heat conduction, additional heat-conducting materials may optionally be provided between the luminous means and the component, or its component housing or its receptacle for the luminous means, for example heat-conducting pastes, adhesives or layers.

In particular, the component or the component housing is associated with an additional optics for (improved) focusing and / or directed delivery and / or conduction of the light emitted by the illuminant. This optic is arranged in particular on or in the component housing or preferably detachably connected thereto. The additional optics serve to transmit light from the illuminant to a radiation location, preferably in the vicinity of the tool or the tool holder, for illuminating the working area of the dental appliance. The light is preferably passed on or through the component. A lighting optimally aligned with the area to be treated is ensured by preferably additionally additionally having a focusing optic on the instrument or on the illuminant. By at least one portion or component of the component or the component housing, an optic is preferably performed. This optic is designed in particular as a waveguide and / or light guide. Thus, the light can be conducted and / or preferably radiated directionally. In particular, glass fibers, synthetic fibers and the like come into consideration, in particular also as bundles. The light guide or the optics can preferably be detachably connected to the light source. He or she may also be assigned to the component or component housing. The light guide serves to deliver the light emitted by the light source in the vicinity of the component holder, so that preferably the working area of the dental instrument is illuminated. Accordingly, in this case, the lighting means is preferably arranged in the grip piece or more preferably in the drive piece or coupling piece. Preferably, a first end-side end region of the light guide is assigned to the light-emitting region of the light-emitting diode chip, facing or contacted with this. More preferably, a second end-side end region of the light guide is provided, which is preferably formed as an aperture for emitting light and / or associated with a working area of the instrument opening of the component housing, preferably to allow illumination of the work area.

Preferred embodiments of the invention will be described in more detail below with reference to the drawing. In this show:

1 A side view of a first embodiment of a luminous means according to the invention,

2 an exploded view of the bulb according to 1 .

3 a view of the bulb of the 1 from below,

4 a second embodiment of the invention,

5 a third embodiment of the invention, and

6 an elbow of a dental instrument.

In the in the 1 to 3 illustrated bulbs 10 it is a first embodiment of the invention. For generating light, the light source 10 a LED chip 12 on, in the present case, the two electrodes 14 and 16 having. One of the two electrodes 14 and 16 represents an anode, the other a cathode.

The two electrodes 14 and 16 are each with a connecting leg 18 respectively. 20 connected as connecting means. Each of these connecting legs 18 and 20 each has a first conductor section 22 and a second conductor section 24 on. The first ladder section 22 is at one end with the respective electrode 14 respectively. 16 connected. At the other, opposite end of the ladder section 22 this is the second conductor section 24 connected. The two conductor sections 22 and 24 each have an elongated, rod-like shape. In cross section, they are each formed circular, so are a total of substantially cylindrical or rod-shaped.

Above the LED chip 12 is for focusing or directed radiation of the light-emitting diode chip 12 at a large angle of emitted light, a lens 26 arranged as optics. To a low-loss arrangement relative to or a connection to the light-emitting portion of the LED chip 12 to allow, points the lens 26 a first planar lens surface 28 on. A second lens surface 30 is accordingly convex for focusing the light. The Lens 26 also forms an upper end of the housing at the same time 32 of the bulb 10 ,

The housing 32 is again essentially formed by a heat sink 34 and a pedestal 36 , The heat sink 34 is here as part of the housing 32 educated. He is on his upper face 38 with the lower planar lens surface 28 the lens 26 connected.

At the bottom of the heat sink 34 is one to the upper end face 38 of the heat sink 34 parallel aligned second end face 40 arranged. Overall, the heatsink has 34 thus a substantially cylindrical shape, since it is round in cross-section. The heat sink 34 is essentially made of an electrically conductive and metallic material, namely copper.

The heat sink 34 also has two through holes 42 and 44 on, each extending from the upper face 38 down to the lower end face 40 extend. In these holes 42 . 44 be in the manufacture or assembly of the bulb 10 cylindrical glass body 46 . 48 used. These vitreous bodies 46 . 48 in turn each have an upper end face 50 and a lower end surface 52 on. Between these faces 50 and 52 extends into each of the vitreous bodies 46 . 48 one continuous hole each 54 . 56 , The vitreous body 54 . 56 are therefore sleeve-shaped or hollow cylindrical.

In or through the holes 54 respectively. 56 the vitreous 46 respectively. 48 becomes when assembling the bulb 10 one connecting leg each 18 respectively. 20 with the respective upper conductor section 22 introduced or inserted. For this purpose, but first the conductor section during assembly 24 through the respective hole 54 . 56 be put through. The LED chip 12 then lies with the electrodes 14 respectively. 16 on the respective face 50 of the respective vitreous body 46 respectively. 48 on. The vitreous body 46 and 48 serve to the connecting legs 18 and 20 opposite the electrically conductive heat sink 34 electrically isolate.

The from the heat sink 34 down from the face 40 outstanding connecting legs 18 and 20 be through the holes 58 respectively. 60 of the pedestal 36 passed. These holes 58 and 60 each extend from the upper end face 62 of the pedestal 36 parallel to it arranged lower end face 64 , Accordingly, the conductor sections become 24 the two connecting legs 18 and 20 through the frontal area 62 into the holes 58 respectively. 60 introduced and occur after complete assembly of the heat sink 34 with the pedestal 36 , so at the latest when touching the face 40 with the face 62 , from the lower end face 64 out. The protruding conductor sections 24 the two connecting legs 18 and 20 serve for electrical contacting of the LED chip 12 or for connecting the same with a current source, not shown here. This can be the bulb 10 with the two outstanding conductor sections 24 and the pedestal 36 be inserted into a corresponding corresponding counterpart of a connector, which is not shown here. This counterpart is arranged, for example, in the interior of a dental instrument, for example at an angle, hand or coupling piece.

Between the LED chip 12 and the heat sink 34 For improving the heat conduction, a thermally conductive material (not shown here), such as a thermal compound, is introduced. The heat sink 34 comes with the pedestal 36 by an adhesive, here a synthetic resin, connected. By including the lens 26 on the heat sink 34 placed or glued and the counterpart of the connector, not shown, with the base 36 sealingly closes, can at least a liquid-tight closure of the bulb 10 in the appropriate dental instrument.

The LED chip 12 gives off heat during operation, which must be dissipated to the life of the LED chip 12 not unnecessarily shorten. The waste heat is using the thermally conductive material, such as a thermal grease, more effective than without such on the heat sink 34 transfer. This heat sink 34 In turn, the heat is mainly emitted laterally outwards to the environment and thus possibly to the air or neighboring components.

The heat sink 34 , the base 36 and the lens 26 have substantially the same cross-section in this embodiment. It is a circular cross-section. This results in a total of a substantially cylindrical shape of the housing in each case 32 from heat sink 34 , Pedestal 36 and lens 26 , The components of the bulb 10 , in particular the heat sink 34 , the base 36 and optionally the lens 26 are arranged coaxially with each other, in particular with regard to their coincident longitudinal central axis 72 , The longitudinal central axis 72 also corresponds to that of the entire bulb 10 , Also the shape of the entire bulb 10 , starting from the housing 32 , is therefore essentially cylindrical. The side surfaces of the housing 32 are essentially smooth.

While in the first embodiment of the 1 to 3 Lamp 10 with elongated and straight legs 18 and 20 are shown, the show 4 and 5 two further embodiments of the invention, which have some modifications over the first.

The second embodiment in the 4 also shows a light source 10 with through the face 64 from the pedestal 36 emergent legs 18 and 20 or their conductor sections 24 , Unlike the first embodiment, however, here are the conductor sections 24 around the edge between the lower face 64 and a side surface 66 of the pedestal 36 guided around so that they partly at the lower end face 64 and on the side surface 66 of the pedestal 36 issue. This serves to be able to correspond with a different from that of the first embodiment connector. Incidentally, in this second embodiment, an additional intermediate layer 68 or a spacer between the lens 26 and the heat sink 34 inserted.

Unlike the first embodiment, the socket 36 equipped with a larger diameter than the heat sink 34 , The heat sink 34 and the pedestal 36 However, in this case are each formed substantially cylindrical. Incidentally, they are also concentric with each other with respect to their longitudinal central axis 72 and that of the entire bulb 10 aligned, as is the case in the first example.

In the third embodiment, which is in 5 is shown and also substantially corresponds to the first is the pedestal 36 formed in cross section with a slightly larger diameter than the heat sink 34 , In addition, the pedestal points 36 still a neck 70 on the bottom of the face 64 of the pedestal 36 is attached or is molded on it. This neck 70 is also formed cylindrically in its outer shape. In the interior, for example, it has two bushing-shaped recesses, which serve for contacting with a corresponding counterpart, a connector not shown here.

The electrical contacts are formed by the correspondingly formed as sockets sections of the connecting legs 18 respectively. 20 provided. The two sockets are not shown here. Alternatively, the nozzle 70 also include only a single central terminal in the form of a socket. In this case, the outer circumference of the neck 70 for example, as a second contact be trained and serve as such. Thus, a total of a coaxial (plug) connection or connectivity of the bulb 10 given.

6 finally shows a dental instrument, concretely including an elbow 74 , Handpieces, etc. are alternatively used in this way. At the bottom, the elbow points 74 a grip 76 on, which is equipped with a slip-resistant design by grooves or a coating for safe handling by a treating or an operator. This is followed by a center piece 78 which is slightly bent for optimal positioning, for example in the mouth of a patient. A to the middle piece 78 subsequent transition piece 80 serves for connection to a head piece 82 , The head piece 82 serves to hold a tool, not shown here, such as a drill with the aid of a tool holder 84 ,

At a lower end portion of the handle 76 is a so-called coupling piece 86 arranged. This coupling piece 86 is detachable with the angle piece 74 connected by means of a coupling not shown here in detail in order to make a quick change of the components can. Inside the coupling piece 86 is the light source 10 arranged. The light source 10 is with his pedestal 36 in a recording 88 plugged in, as part of a connector corresponding to the bulb 10 arranged part of the connector is formed. About this recording 88 becomes the light source 10 supplied with electricity. The further contacting is not shown here in detail. The light source 10 lies with at least a portion of the heat sink 34 on a part of the housing 90 of the coupling piece 86 at. This is a particularly effective heat dissipation directly from the LED chip on the heat sink to the coupling piece 86 guaranteed.

The light emitting end of the bulb 10 in the field of the lens 26 is the elbow 74 arranged facing. To that of the bulbs 10 To be able to transport radiated light to the working area of the dental instrument, which is located near the tool holder 84 is inside the handpiece 74 a light guide 92 arranged. A first end area 94 of the light guide 92 is located on the coupling piece 86 facing end portion of the handpiece 74 , There is the end area 94 of the light guide 92 such in spatial proximity of the bulb 10 or its lens 26 arranged that from the bulb 10 emitted light at least mostly in the light guide 92 is coupled. A second end area 96 of the light guide 92 enters through an exit opening 98 below the head piece 82 from the transition piece 80 in the area of the outlet opening 98 out. The end area 96 of the light guide 92 is arranged such that an illumination of the working area of the dental instrument can take place.

To change the bulb 10 For example, because of a defect of the same or for cleaning, is first the elbow 74 from the coupling piece 86 separated. Next is the bulb 10 from the recording 88 removed, for example, pulled out. The light source 10 is then used for re-contacting or after an exchange for the first time with the socket 36 ahead in the recording 88 pushed in and thereby arranged with the therein, not shown in detail counterpart of the connector to the base 36 with the connection legs 18 and 20 connected. For this purpose, the connector corresponding receptacles for the connecting legs 18 and 20 on.

In the recording 88 Can be used to improve the heat dissipation of a bearing surface for the heat sink 34 be formed so that the light from the LED chip 12 on the heat sink 34 passing waste heat from there directly to the contra-angle 74 or parts thereof can be transferred. Incidentally, the elbow can 74 also have an active cooling, for example by in the elbow 74 for the dental treatment existing process water is used.

In the installed state of the bulb 10 , for example, in the elbow 74 a dental instrument itself instead of the coupling piece 86 , is located in the immediate vicinity of or adjacent to the heat sink 34 a part of the elbow 74 , Thus, by direct contact, the waste heat from the heat sink 34 on the elbow 74 be transmitted. Overall, this is also an effective cooling of the LED chip 12 taken care of.

Instead of the elbow shown here 74 , which is a curved version of the center piece 78 shows, can also be used in a similar manner so-called hand pieces, which are a substantially straight centerpiece 78 exhibit. Other similar components of dental or general medical instruments or devices can be in the manner described here with bulbs according to the invention 10 equip. The arrangement of the bulb 10 in the area of the coupling piece 82 is also not mandatory. In principle, it can also take place at other positions or in other components of a (dental) medical instrument, for example inside the contra-angle 74 or directly in the area of the transition piece 80 ,

LIST OF REFERENCE NUMBERS

10

Lamp

12

LED chip

14

electrode

16

electrode

18

connecting leg

20

connecting leg

22

conductor section

24

conductor section

26

lens

28

lens surface

30

lens surface

32

casing

34

heatsink

36

base

38

face

40

face

42

drilling

44

drilling

46

vitreous

48

vitreous

50

face

52

face

54

drilling

56

drilling

58

drilling

60

drilling

62

face

64

face

66

side surface

68

interlayer

70

Support

72

Longitudinal central axis

74

elbow

76

grip

78

centerpiece

80

Transition piece

82

headpiece

84

tool holder

86

coupling

88

admission

90

casing

92

optical fiber

94

end

96

end

98

outlet opening

Claims (15)

Illuminant, in particular light-emitting diode, for a dental instrument, in particular for a component of a dental instrument, in particular a handpiece and / or angled piece and / or coupling piece, with a light source, in particular a light-emitting diode chip ( 12 ) for generating and / or emitting light, and with an optical system, in particular a light guide and / or a lens ( 26 ), for focusing and / or directed radiation of the light emitting diode chip ( 12 ) generated light, wherein the LED chip ( 12 ) with a heat sink ( 34 ) is in thermally conductive connection, so that of the LED chip ( 12 ) emitted heat from the heat sink ( 34 ) and / or from the heat sink ( 34 ) to the environment of the heat sink ( 34 ) is deliverable. Illuminant according to claim 1, characterized in that a housing ( 32 ) is provided, preferably as an outer boundary, wherein the heat sink ( 34 ) at least partially as part of the housing ( 32 ) is formed, preferably for heat dissipation to the environment and / or surrounding components. Illuminant according to claim 2, characterized in that the housing ( 32 ) is plug-like, in particular designed as a plug and / or that the housing ( 32 ) and / or a preferred the housing ( 32 ) associated socket ( 36 ) or base portion is preferably formed at least partially made of plastic, and / or that the housing ( 32 ) or a part of the housing ( 32 ) with the heat sink ( 34 ), in particular by gluing, preferably by synthetic resin. Illuminant according to one of the preceding claims, characterized in that the heat sink ( 34 ) is at least partially made of a thermally conductive material and / or a material having a high heat capacity, in particular of metal, preferably of copper, and / or that the heat sink ( 34 ) and / or the housing ( 32 ) is at least partially metal-coated, in particular gold and / or silver and / or platinum coated. Illuminant according to one of the preceding claims, characterized in that the light-emitting diode chip ( 12 ), in particular an electrically insulating component thereof, preferably its substrate, with the heat sink ( 34 ) is in contact, preferably thermally conductive, wherein preferably the LED chip ( 12 ) on or on the heat sink ( 34 ) is arranged and / or fixed, wherein more preferably between the LED chip ( 12 ) and the heat sink ( 34 ) a heat-conducting material, in particular a preferably silver-based thermal compound and / or adhesive is provided. Illuminant according to one of the preceding claims, characterized in that at least one connection means, in particular a connection leg ( 18 . 20 ), for electrical contacting of the LED chip ( 12 ), wherein the connecting means preferably at least partially within the heat sink ( 34 ) and / or the housing ( 32 ), and / or wherein the connection means is preferably electrically and / or thermally opposite the heat sink ( 34 ) and / or the Casing ( 32 ) is isolated, in particular by at least partially embedding in the glass or frit glass, preferably in sleeve form. Illuminant according to one of the preceding claims, characterized in that the connection means a plurality of conductor sections ( 22 . 24 ), wherein preferably at least one first conductor section ( 22 ) preferably directly and / or firmly with the LED chip ( 12 ), and / or wherein at least one second conductor section ( 24 ) is preferably provided in the form of a plug connection with a power source, and / or that the connection means is at least substantially rigid. Illuminant according to one of the preceding claims, characterized in that the heat sink ( 34 ) at least one, in particular a plurality, preferably from an end face ( 38 ) to an opposite end face ( 40 ) reaching, particularly preferably straight, continuous bore ( 42 . 44 ), wherein preferably each of the bores ( 42 . 44 ) is assigned a connection means, which particularly preferably the respective bore ( 42 . 44 ) passes completely and in particular on at least one side of the bore ( 42 . 44 ) stands out. Illuminant according to one of the preceding claims, characterized in that the light-emitting diode chip ( 12 ) several, preferably two electrodes ( 14 . 16 ) or each of the terminals, wherein at least one, preferably each of the electrodes ( 14 . 16 ) or connections with one of the connection means and / or the housing ( 32 ) and / or the heat sink ( 34 ) is in electrically and / or thermally conductive connection. Illuminant according to one of the preceding claims, characterized in that the optic is arranged facing the light-emitting diode chip, preferably with the light-emitting diode chip ( 12 ) is preferably in direct contact, in particular on the light-emitting diode chip ( 12 ) is preferably placed directly on or, in particular centric, preferably on the active or light-emitting surface of the light-emitting diode chip ( 12 ), in particular with an at least substantially flat part of the optics, the flat side preferably being the light-emitting diode chip ( 12 ), and / or that the optics on the LED chip ( 12 ) is placed or hung up, and / or that the optics, in particular the lens ( 26 ) is formed at least substantially of silicone and / or plastic. Illuminant according to one of the preceding claims, characterized in that the heat sink ( 34 ) and / or the housing ( 32 ) substantially cylindrical with preferably substantially flat end surfaces ( 38 . 40 . 62 . 64 ) is formed, and / or that the housing ( 32 ) preferably with an end face ( 62 ) on or on a first end face ( 40 ) of the heat sink ( 34 ) and the LED chip ( 12 ) with a preferably substantially flat surface on or on a second, opposite end face (FIG. 38 ) of the heat sink ( 34 ), and / or that the heat sink ( 34 ) and / or the housing ( 32 ) and / or the optics and / or the LED chip ( 12 ) are preferably arranged axially or concentrically with one another, in particular with respect to a (common) longitudinal central axis ( 72 ). Component of a dental instrument, in particular handpiece and / or angle piece and / or coupling piece, with a component housing and at least one light source ( 10 ) according to one of the preceding claims, in particular for illuminating a working area of the dental instrument. Component according to claim 12, characterized in that the lighting means ( 10 ) is arranged interchangeably on or in a receptacle of the component housing and / or connected to the component housing, preferably by means of a particular for mounting and / or power supply of the illuminant ( 10 ) suitable plug connection, wherein a first part of the plug connection, in particular a socket, the component and a second, corresponding part of the plug connection, in particular a plug, the lighting means ( 10 ) assigned. Component according to claim 12 or 13, characterized in that of the lighting means ( 10 ) produced waste heat, in particular from a heat sink ( 34 ) of the illuminant ( 10 ) discharged waste heat, at least from a part of the component housing and / or the receptacle of the component housing is receivable. Component according to one of claims 12 to 14, characterized in that at least one optics for focusing and / or directed discharge and / or conduction of the light from the ( 10 ) is provided, wherein the optics is arranged in particular on or in the component housing or preferably detachably connected thereto, and / or that for the forwarding and / or transport and / or for the directed emission of the emitted light at least one light guide ( 92 ), in particular a glass fiber, a (photoconductive) plastic fiber or the like, or a bundle thereof, wherein a first, in particular end-side end region ( 94 ) of the light guide ( 92 ) preferably the light-emitting region of the LED chip ( 12 ), and / or wherein a second, in particular end-side End area ( 96 ) of the light guide ( 92 ) preferably as an aperture for emitting light, in particular a working area facing the opening, in particular outlet opening ( 98 ), faces the component housing, in particular the component housing at least partially passes.

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