WO2016012189A1

WO2016012189A1 - Semiconductor lamp and method for producing same

Info

Publication number: WO2016012189A1
Application number: PCT/EP2015/064369
Authority: WO
Inventors: Thomas Bittmann; Franz Seibold; Johann Mayer; Wiglef Kutschke
Original assignee: Osram Gmbh
Priority date: 2014-07-24
Filing date: 2015-06-25
Publication date: 2016-01-28
Also published as: DE102014214604A1

Abstract

A semiconductor lamp (21) has a light-transmissive bulb (2) having a tubular basic shape, said bulb having contact regions (5) extending circumferentially on the end side, at least one substrate (3) which is accommodated in the bulb and on which at least one semiconductor light source (4) is arranged, end caps (22) for the end-side closure of the bulb (2), and volume-constant adhesion medium (6) for cohesively connecting a respective pair of end cap and contact region (5), wherein the contact regions (5) taper toward a respective end (9) of the bulb (2). A method serves for producing a semiconductor lamp (21), comprising: providing a light-transmissive bulb having a tubular basic shape, the circumferentially extending contact regions (5) of said bulb tapering toward the respective end (9); providing end caps (22); applying a volume-constant adhesion medium (6) to the contact regions (5) and/or to mating contact regions (24) of the end caps; and placing the end caps onto the contact regions in such a way that they press onto the adhesion medium. The invention is more particularly applicable to replacement lamps or retrofit lamps for replacing conventional fluorescent lamps or linear lamps.

Description

description

The invention relates to a semiconductor lamp comprising a translucent piston of a tubular basic shape, at least one substrate accommodated in the piston, which piston has end-to-end contact regions, and end caps for closing the end of the piston and constant-volume adhesive at least cohesive connection of a respective pair of end cap and

Contact areas. The invention also relates to a method for producing a semiconductor lamp. The invention is particularly applicable to replacement lamps or retrofit lamps for replacement of conventional fluorescent lamps or line lamps.

As so-called "LED retrofit lamps" 101, as in Fig.4

indicated, tubular LED lamps known that are used as a replacement for conventional fluorescent lamps. Such LED retrofit lamps 101 are essentially composed of a translucent tubular piston 102 (with a longitudinal axis A), a printed circuit board 103 accommodated in the piston 102 with LEDs 104 arranged thereon,

electronic components 105 and end caps 106 for both lamp ends. The electronic components 105 form a

Driver circuit, which is integrated as an independent component in an end cap 106.

In conventional fluorescent lamps attachment of the end caps with a piston by means of a putty

accomplished. The putty is on a cylindrical

Cross-sectional constriction or curl applied to end portions of a glass bulb. Subsequently, a cylindrical, unilaterally open end cap is pushed in the form of a metal base over the Anrollung so that the putty is in a hollow cylindrical annular gap between the Anrollung and the metal base. The putty foams and thereby generates in the annular gap a cohesive connection of Piston and metal base. After curing at high temperature (typically in an oven at greater than 200 ° C), the putty is hard and the bond is stable and stiff. A slight tilt or tilt of the piston and

Metal base is not critical due to the foaming property of the cement for sealing the piston.

Returning to Fig. 4, however, this type of

Connection for the end cap 106 and the piston 102 of the LED retrofit lamp 101 is not suitable, since the

Curing temperatures in an annular gap 107 between a curl 108 and the end cap 106 above damage temperatures of typical components

Retrofit lamp 101, e.g. the LEDs 104 and the

electronic components 105. In the LED retrofit lamps 101 is therefore typically to avoid a

High Temperature Cure Adhesive 109 is used in the form of epoxy or silicone instead of the cement. The epoxy or silicone does not foam so that the annular gap 107 between the curl 108 and the end cap 106 must be particularly narrow (typically with a gap width or gap height Rh in a range of 0.2 mm to 1.0 mm) to ensure a tightness. However, since the annular gap 107 should be equally thick all around the circumference, this low gap height Rh increases a requirement for a

positionally accurate joining significantly, and thus the

Production costs. In order to provide sufficient tightness of the piston 102, the adhesive 109 must also be pressed against the corresponding adhesive surfaces, which further increases a requirement for joining, in particular with respect to an inclination or tilting of the piston 102 and end cap 106.

It is the object of the present invention to overcome the disadvantages of the prior art at least partially, and in particular to provide a possibility for simplified joining of an end cap with a piston of a semiconductor lamp, in particular a retrofit lamp. This object is achieved according to the characteristics of the independent

Claims solved. Preferred embodiments are

in particular the dependent claims.

The object is achieved by a semiconductor lamp,

comprising (i) a translucent piston with

tubular basic shape, which piston end-circumferential contact areas, (ii) at least one accommodated in the piston substrate, on which at least one

Semiconductor light source is arranged, (iii) end caps for the end closure of the piston and (iv) volume constant adhesive for material connection of the end caps with a respective contact area. The contact areas

taper towards a respective end of the piston.

The tapering of the contact areas greatly facilitates the joining of the end cap and the piston. In particular, such an influence of a tilt between the end cap and the piston on the tightness is substantially reduced. Also, it can now be due to the pushing on the end cap

continuously decreasing gap height, simply make sure that the adhesive is compressed sufficiently all the way around the contact area

to achieve required tightness.

The piston may be completely or partially translucent.

Since in the piston, the at least one substrate is housed, and thus the piston envelops the substrate, the piston may also be regarded as an enveloping body. Since the piston also holds or carries the at least one substrate directly or indirectly, the piston can also be considered as a carrier body.

In particular, if the piston is a rectilinear piston, it may have an imaginary rectilinear longitudinal axis. However, the piston may also be curved at least in sections be, for example, U-shaped curved, and then have a correspondingly shaped longitudinal extent.

In particular, the at least one semiconductor light source comprises at least one light-emitting diode. If several LEDs are present, they can be lit in the same color or in different colors. A color may be monochrome (e.g., red, green, blue, etc.) or multichrome (e.g., white). This can also be done by the at least one light emitting diode

emitted light is an infrared light (IR-LED) or an ultraviolet light (UV-LED). Several light emitting diodes can produce a mixed light; e.g. a white mixed light. The at least one light-emitting diode can have at least one

wavelength-converting phosphor included (conversion LED). The phosphor may alternatively or additionally

away from the light emitting diode ("Remote

Phosphorus "), for example on the piston

Light emitting diode may be in the form of at least one individually housed light emitting diode or in the form of at least one LED chip

available. Several LED chips can be on a common

Submount be mounted. The at least one light emitting diode may be equipped with at least one own and / or common optics for beam guidance, e.g. at least one

Fresnel lens, collimator, and so on. Instead of or in addition to inorganic light emitting diodes, e.g. based on InGaN or AlInGaP, are also generally organic LEDs

(OLEDs, for example polymer OLEDs) can be used. Alternatively, the at least one semiconductor light source may be e.g. have at least one diode laser.

The substrate may in particular be a printed circuit board which is equipped with the at least one semiconductor light source. The circuit board may be a ribbon-shaped circuit board. It may be unilateral or bilateral, with at least one each

Be equipped semiconductor light source. It may be stiff or bendable. The substrate will be without

Restriction of the general public as well

"Light source substrate". Of the end caps in particular, both are designed for mechanical fastening of the lamp in a socket, for example in a conventional version. At least one of the end caps also serves for electrical contacting of the lamp, for example for supplying an electrical supply signal. For example, such an end cap may have two metal pins at the front end, which are connected to a driver. In particular, if the end cap is designed for both mechanical and electrical connection, it may be referred to as a "socket".

The end caps in particular have contact counter regions, which are provided for contacting the contact regions of the piston.

It is a continuing education that the contact areas of

Pistons and the contact counter areas of the end caps circumferential areas are to ensure a particularly secure sealing of the

Reach the piston. The contact counter regions of the end caps can be placed on a respective contact region of the piston in particular circumferentially to close the piston.

A contact area of the piston is understood in particular to mean an area or a surface intended to contact the contact area of the end cap. The contact areas for maximum intended contact areas and

Contact counter areas may in particular be larger than the actual contact area or contact counter area on which the piston actually (directly or indirectly via the

Adhesive) comes into contact with the end cap.

In particular, the fact that the contact areas of the piston are tapered surfaces towards the respective end may include that with decreasing longitudinal distance to a next end of the piston (e.g., towards its end face) in each

Circumferentially have a smaller radial distance from the longitudinal axis. A volume-constant adhesive may, in particular, be understood as meaning an adhesive, for example an adhesive, which does not significantly change its volume after application, in particular does not foam. The adhesive may be an organic adhesive, especially glue. The

Adhesive may be epoxy or silicone.

It is an embodiment that the piston itself

having continuously tapered end portions which provide the respective contact area of the piston. In other words, the end portions may be formed as continuously tapered contact portions. This allows a particularly compact and material-saving construction.

A continuously tapering end region may, in particular, be understood to mean a terminal region or section of the piston which tapers from a certain distance from its nearest end surface until it reaches the end face and, for example, after a taper, does not have sections which are closer to the end face has, for example no sections with constant profile and / or no extensions.

It is still an embodiment that the contact areas of the piston have a frusto-conical outer contour. This is particularly easy to implement and manufacturing tolerant. The conical outer contour has a rectilinear shape in a longitudinal section. In particular, a wall thickness of the piston in the end region or contact region is at least substantially constant.

It is an alternative development that the end areas and thus also the contact areas of the piston in the

Longitudinal section have curved outer contour. This extends a design possibility of contacting, e.g. in the

With regard to adaptation to a desired course of a contact force. It is a further embodiment that an inclination or an inclination angle of a contact area of the piston against a longitudinal axis of the piston is at least 2 ° and at most 10 °, in particular in a range between 3 ° and 6 °, in particular in a range between 4 ° and 6 °. These slope areas are so shallow that they advantageously allow a long bonding area and contact area as well as a long attachment path of the end cap (s) and are large enough to allow high manufacturing tolerance.

It is also an embodiment that the end cap a

Base body having an end wall and a piston side attached thereto circumferential side wall, wherein at least a portion of the side wall, in particular an inner surface thereof, a contact counter portion is, which is placed on a respective contact region of the piston. The end cap is thus placed with its inner side, which provides a contact counter area, on the tapered contact area of the piston, in particular

pushed.

The circumferential side wall of the end cap or its inner surface may be formed as a hollow cylinder in a development, wherein the end wall covering a side facing away from the piston surface of the side wall. The other end face of the side wall is open. The end cap may therefore in particular in the form of a one-sided open

Hollow cylinder present. It is an advantageous for a particularly large current contact surface between the end cap and the piston and thus a particularly strong and dense adhesion

Embodiment, that the contact counter region of the end cap is widened in the direction of the piston. In addition, both a centering of the end cap and a distribution of the adhesive can be made particularly favorable. A

Tilt direction of the contact area of the piston and a Tilt direction of the contact counter portion of the end cap is thus the same.

The contact counter region of the end cap may in particular have a basic shape which is at least similar to the contact region of the piston. It is a development that the side wall of the end cap has at least in sections a frustoconical basic shape. It is yet another embodiment that one

Inclination angle of the contact counter region of the end cap, in particular against a longitudinal axis, in a range between 2 ° and 10 °, in particular in a range between 3 ° and 7 °, in particular in a range between 5 ° and 7 °. Thus, a particularly good handling and a particularly secure and tight fit of the end cap on the piston can be achieved.

It is also an embodiment that an inclination angle of the contact counter portion is larger or smaller than a

Inclination angle of the contact surface of the piston. With a different opening or inclination angle between the piston and the end cap can be a flow direction of the

Adhere adhesive and thus determine at which longitudinal end excess adhesive exits. For a difference in the inclination angle between 1 ° and 2 ° is particularly advantageous.

It is yet another embodiment that the main body of the end caps consists of plastic. For an end cap serving only as a mechanical support, it may be made entirely of plastic. In a mechanical and electrical contacting, the end cap may additionally have at least one electrically conductive element (e.g.

Contact pin), in particular as a

can serve electrical connector between a socket and a driver. The driver likes one or more electrical and / or

have electronic components. The driver likes

in particular be a driver electronics. The components of the driver may be wholly or partially on an independent circuit board (hereinafter without limitation

Generality called "driver board") may be arranged. The components of the driver may be arranged wholly or partially on the light source substrate. The components of the driver like in particular partially on the

standalone driver board and partly on the

Be arranged light source substrate. If one

Driver board is present, it may be arranged in particular in or on an end cap. It is also an embodiment that the piston a

Glass bulb is. A glass bulb is, among other things, particularly mechanically, chemically and thermally resistant. The present invention is particularly effective applicable to a combination of a glass bulb with an end cap (or its body) made of plastic, since a plastic

noticeably higher thermal expansion than glass.

It is a training that the piston one

Plastic piston is. Such is particularly easy and inexpensive to produce.

It is also an embodiment that the end caps or their contact counter regions touch the contact areas of the piston only via the adhesive, so the end caps do not contact the piston directly or directly. Thus, a tightness of the adhesive connection is achieved particularly reliable. This embodiment may e.g. by a

predetermined maximum force in the application of the end cap to be implemented.

However, it is also possible that the end caps the

Contact areas of the piston at least partially directly, for example, an inner edge of the end cap on a ₁

Contact area of the piston rests. This embodiment can be e.g. By pushing on an end cap to the stop at a comparatively high maximum force implement.

It is also an aspect that a gap width or gap height of an adhesive gap filled by the adhesive between the contact area of the piston and the end cap, in particular its contact counter area, is in a range between 0.2 mm and 1 mm.

It is also an embodiment that the

Semiconductor lamp is a retrofit lamp. In particular, it likes a form factor of a fluorescent lamp, e.g. type T5 or T8, or a line lamp.

At least one end cap of the retrofit lamp may be shaped similarly to a type G5 or G13 socket.

The object is achieved by a method for producing a semiconductor lamp, the method comprising at least the following steps: (a) providing a

translucent piston with a tubular

Basic shape, the circumferential contact areas taper to the respective end; (b) providing

end caps; (c) applying a volume-constant adhesive to the contact areas of the piston and / or on

Contact counter areas of the end caps; and (d) placing the end caps on the contact areas so that they rest on the

Press adhesive.

The method can be configured analogously to the lamp described above and has the same advantages.

The above-described characteristics, features and advantages of this invention as well as the manner in which they are achieved will become clearer and more clearly understood

In connection with the following schematic description of an embodiment that is related to the Drawings will be explained in more detail. In this case, the same or equivalent elements may be provided with the same reference numerals for clarity.

1 shows a sectional side view of a

Section on an end region of a

Semiconductor lamp according to a first

Embodiment;

2 shows a further enlarged section of the

end portion of the semiconductor lamp according to the first embodiment; and

3 shows an enlarged detail of a

end region of a semiconductor lamp according to a first embodiment analogous to FIG.

Fig.l shows a semiconductor lamp in the form of a

Fluorescent tube retrofit lamp 1, e.g. for replacement

conventional T5 or T8 fluorescent lamps. The

Retrofit lamp 1 comprises a translucent piston 2 of tubular basic shape, which is e.g. made of plastic or glass. In the piston 2 is a

Light source substrate accommodated in the form of a band-shaped circuit board 3, which is equipped with a plurality of semiconductor light sources in the form of LED chips 4.

The piston 2 has as its end regions in each case a circumferential contact region 5, which are covered with an adhesive 6, as shown in more detail in FIG. In Fig. 2, the light source substrate 3 and the LED chips 4 are not

located. On a respective contact region 5 is a cylindrical, to the piston 2 open end cap 7 is placed. The end cap 7 has a base body 15 which at least from an end wall 7 a with

circular cylindrical basic shape and a piston side attached thereto circumferential side wall 7b with a hollow cylindrical basic shape. The contact area 5 has a to a final or

End face 9 towards continuously tapering

is a continuation of a cylindrical central region 8 of the piston 2. An inclination angle al against a longitudinal axis A is between 5 ° and 7 °, in particular 6 ° to 7 °.

On the outer side or on the outer contour of the contact region 5, a layer of the volume-constant adhesive 6 in the form of silicone or epoxy resin is applied. The end caps 7 are placed on the piston 2, that their free

Edge area presses on the adhesive 6 and thus

cohesively contacted. The serving as a contact counter area and as a contact surface 11 of the end cap 7 free

Edge area and the associated opposite

Contact surface 12 of the contact region 5 are over a filled with the adhesive 6 bonding gap 13 with a

Gap width or gap height H between 0.2 mm and 1 mm

separated from each other. By the inclination of the contact region 5 can also be ensured by simple means that the adhesive 6 is circumferentially about the longitudinal axis A, in particular in the region of the contact surfaces 11 and 12, compressed, as by a front bead 14 of the adhesive. 6

indicated. Thus, the adhesive 6 can securely seal the piston 2 and the end cap 7 with high tolerance to positioning inaccuracies, e.g.

Tilt errors, the piston 2 and the end cap 7. A

Inside of the contact surface 11 may be chamfered

(not shown), e.g. with the inclination angle al.

An inner diameter dl of the end cap 7 is in particular smaller than a widest edge of the contact region 5, which here corresponds to the outer diameter dK of the central region 8 of the piston 2 (corresponding to dK> dl). This ensures that the end cap 7 does not over the

Contact area 5 can be pushed out onto the central area 8. In addition, an outer diameter dS of the piston 2 on the end face 9 smaller than the inner diameter dl of the end cap 7 (corresponding dl> dS).

The main body 15, 7a, 7b of the end cap 7 consists of

Plastic, in which the electrical and / or

electronic components 105 of the driver circuit are accommodated on a common driver board 16. The

Components 105 are connected via electrical lines 17 with the

Light source substrate 3 connected (not in Fig.2

drawn). The components 105 are also guided via electrical lines 18 through the main body 15,

electrically conductive contact pins 19 connected. The

End caps 7 can thus in particular as a bipin socket

be formed, e.g. Type G5 or G13. About the

Contact pins 19, electrical supply signals can be fed, which are converted by means of the components 105 and the driver circuit into operating signals for operating the LED chips 4. FIG. 3 shows a representation analogous to FIG

Semiconductor lamp in the form of a fluorescent tube retrofit lamp 21, which is also e.g. to replace conventional T5 or T8 fluorescent lamps. The

Retrofitlampe 21 has, in contrast to the retrofit lamp 1, an end cap 22, the circumferential side wall 23 in

Direction of the piston 2 is expanded, namely

The angle of inclination 2 of the side wall 23 is here 4 ° to 6 °, in particular 4 ° to 5 ° and is in particular 1 ° to 2 ° lower than the inclination angle l of the

Contact area 5.

At least part of an inner surface of the side wall 23 is formed as a contact opposing portion 24 which is located on the

Contact area 5 of the piston 2 can be placed. Of the

Contact counter area 24 of the end cap 22 here corresponds at least approximately to the actual contact area 25. The basically usable contact counter area 24 thus becomes here practically completely used actually as a contact surface 25. The actual contact surface 11 of the

Contact area 5 is considerably larger than the

Retrofit lamp 1 and therefore denser and safer.

Although the invention in detail by the shown

The exemplary embodiment has been illustrated and described in more detail, the invention is not limited thereto and other variations can be derived by the person skilled in the art without departing from the scope of the invention.

Generally, "on", "an", etc. may be taken to mean a singular or a plurality, in particular in the sense of "at least one" or "one or more" etc., unless this is explicitly excluded, e.g. by the expression "exactly one", etc.

Also, a number may include exactly the specified number as well as a usual tolerance range, as long as this is not explicitly excluded.

, _c

15

Reference sign

1 fluorescent tube retrofit lamp

2 pistons

3 circuit board

4 LEDs

5 contact area

6 adhesives

7 end cap

7a frontal wall

7b sidewall

8 central area

9 face

11 contact surface of the end cap

12 contact area

13 adhesive gap

14 front bead

15 basic body

16 driver board

17 Electric line

18 Electric line

19 contact pin

21 Fluorescent tube retrofit lamp

22 end cap

23 side wall

24 contact area

25 contact area

101 LED retrofit lamp

102 pistons

103 circuit board

104 LED

105 Electronic component

106 end cap

107 annular gap

108 Rolling

109 adhesives

A longitudinal axis

dl inner diameter dK Outer diameter of the central area

dS outer diameter of the end face of the piston

H gap height

Rh gap height

l Inclination angle

2 tilt angles

Claims

Semiconductor lamp (1; 21) comprising

- A translucent piston (2) with

tubular basic shape, which end

has circumferential contact areas (5),

- At least one in the piston (2) housed

Substrate (3) on which at least one

Semiconductor light source (4) is arranged,

End caps (7; 22) for closing the end of the

Piston (2) and

- Volume constant adhesive (6) for the material connection of a respective pair of an end cap (7, 22) and a contact region (5),

in which

- The contact areas (5) taper towards a respective end (9) of the piston (2).

A semiconductor lamp (1; 21) according to claim 1, wherein the piston (2) has continuously tapered end portions which provide the contact portions (5).

Semiconductor lamp (1; 21) according to claim 2, wherein the contact regions (5) have a frusto-conical outer contour.

A semiconductor lamp (1; 21) according to any one of the preceding claims, wherein an inclination angle (I) of the

Contact areas (5) of the piston (2) against a

Longitudinal axis (A) of the piston (2) is in a range between 2 ° and 10 °, in particular in a range between 3 ° and 6 °, in particular in a range between 4 ° and 6 °.

Semiconductor lamp (21) according to one of the preceding claims, wherein

- The end cap (22) has a base body (23, 7a) with

an end wall (7a) and a thereto Having piston side attached circumferential side wall (23),

- At least a part of an inner surface of the side wall (23) as a contact counter region (24) is formed, which is placed on a respective contact region (5) of the piston (2) and

the contact counter region (24) of the end cap (7) in

Direction of the piston (2) is widened.

A semiconductor lamp (21) according to claim 5, wherein a

Inclination angle (2) of the contact counter region (24) of the end cap (22) against a longitudinal axis (A) is in a range between 2 ° and 10 °, in particular in a range between 3 ° and 7 °, in particular in a range between 5 ° and 7 °.

A semiconductor lamp (21) according to claims 4 and 6, wherein an inclination angle (2) of the contact counter portion (24) and an inclination angle (l) of the contact portion (5) of the piston (2) differ by 1 ° to 2 °.

A semiconductor lamp (1; 21) according to any one of claims 5 to 7, wherein the base body (15; 22, 7a) is made of plastic.

A semiconductor lamp (1; 21) according to any one of the preceding claims, wherein the volume constant adhesive (6) comprises or is silicone or epoxy resin.

A semiconductor lamp (1; 21) according to any one of the preceding claims, wherein the bulb (2) is a glass bulb.

A semiconductor lamp (1; 21) according to any one of the preceding claims, wherein the end caps (7;

Contact areas (5) of the piston (2) only over the

Contact adhesive (6).

A semiconductor lamp (1; 21) according to claim 11, wherein a gap height (H) of an adhesive gap (13) filled by the adhesive (6) between the contact region (5) and the end cap (7; 22) is between 0.2 mm and 1 mm.

13. The semiconductor lamp (1; 21) according to one of the preceding claims, wherein the semiconductor lamp (1) has a

Retrofit lamp is.

14. A method of manufacturing a semiconductor lamp (1; 21), the method comprising at least the following steps:

- Providing a translucent piston (2) having a tubular basic shape, the peripheral contact areas (5) tapering towards the respective end (9);

- providing end caps (7; 22);

- Applying a volume-constant adhesive (6) on the contact areas (5) and / or on

Contact counter portions (11; 24) of the end caps (7; 22); and

- Place the end caps (7, 22) on the

Contact areas (5) so that they press on the adhesive (6).