EP2588800B1 - Lighting module for an outdoor light - Google Patents

Description

Technical area

The present invention relates to a light module for an exterior light, an exterior light, comprising at least one light module, and a method for positioning a plurality of optical systems of a light module.

State of the art

Light modules for outdoor lighting are basically known. They often have a plurality of bulbs, which are arranged behind a lens. In order to produce a defined and directed illumination by such a light module, optical systems are often provided or even necessary to influence the beam path of the generated light. Particularly in the case of light sources in the form of LEDs, such an optical system, for example in the form of lenses, is absolutely necessary. In known light modules, the individual lamps in the form of LEDs are often arranged on boards. In order to achieve the desired, in particular the same, light distribution with each LED, it is necessary to provide a separate optical system in the form of a separate lens or a reflector for each individual illuminant, that is to say in particular for each LED. Known devices solve this by arranging an optical system on the board directly on each light source. If, for example, 64 light sources are used, then 64 individual parts in the form of 64 optical systems are necessary, which are placed on the respective light sources.

US Pat. No. 7,914,162 B1 describes a LED lamp for motor vehicles. The lamp has a housing base with positioning aids for aligning a PCB equipped with LEDs. In the emission direction, the first circuit board is followed by a heating element, then a reflector plate and finally a transparent cover with Fresnel lenses. The elements are each aligned by positioning aids to each other. However, the alignment of the board is not relative to the lens, but to the lower housing part by guide pins on the inside of the housing base and complementary recesses in the board.

US 2005/0046950 A1 describes a highly integrated micro-optical device for the production of images by the exposure of photosensitive materials. The building has a silicon substrate with side by side arranged LEDs. In the emission direction in front of the silicon substrate is a lens with lenses arranged therein, each LED is associated with a lens. In order to align the LEDs relative to the lenses, the silicon carrier has at least two grooves in which complementary projections of the lens cover engage.

US 2008/0273327 A1 shows an LED lamp with a board on which LEDs are arranged. In front of each LED is a separate lens. The separate lenses sit in openings of a silicone gasket. The housing is closed by a cover. A precise relative positioning of the lens to the board is not possible because of the arranged between these two components flexible seal.

US 2009/0046460 A1 discloses an LED street lamp with a housing base which supports a board on which LEDs are mounted. In the emission direction in front of the LEDs are lenses which are fixed by a lens holder. The housing is closed to the front by a lens without optical elements.

US 2011/0032707 A1 describes a lamp with a housing base that holds printed circuit boards with LEDs. In the light emission direction, lens carriers with lenses are arranged in front of the LEDs. A lens without optical elements closes the case to the front.

EP 1 925 876 A1 describes an LED lamp with LED modules and their associated primary and secondary optics. As usual, the LED modules and the primary and secondary optics are aligned, but D7 does not disclose a lens with optical systems for the LEDs, nor positioning means on a lens.

US 2011/014736 A1 is the closest prior art and shows a housing base on which a board with LEDs is arranged. A lens with lenses disposed therein closes the housing. On the inside of the cover plate four projections 14 are arranged, which engage in a respective recess 24 of the board and thus align the lens and the board against each other.

WO 2010/119580 A1 describes a light module with a housing which is closed at the front by a translucent lens. In the housing is a carrier on which a plurality of light source modules are arranged. Each light source module has a board on which LEDs are arranged. In front of the LEDs sits a catadioptric element with reflector lens structures for parallelizing the light emitted by the LEDs. The orientation of the reflector lens structure relative to the board is effected by two pins which engage in complementary recesses in the board. Each of these pins positions the reflector lens assembly in two axes and would allow as the only positioning means rotation of the board relative to the reflector lens element and a displacement along the pin axis. As a further positioning means, the reflector lens unit has screw base and spacers. These position the reflector lens unit in each case in exactly the same axis.

US 2011/0043120 describes a headlight for aircraft. The headlight has a lower housing part that is closed to the front through a transparent lens. In the housing sits a board on the "LED arrays" are arranged with multiple LEDs. Between the "LED arrays" and the lens, a lens array is arranged, each "LED array" is associated with a lens.

EP 2 206 945 A1 shows an outdoor lamp with a housing in which a PCB equipped with LEDs is arranged. In front of the LEDs, a lens is arranged, which has a plurality of lenses, each LED is associated with exactly one lens. The positioning of the board relative to the lens is done on the one hand by parallel to the board arranged reference signs contact surfaces, ie by a positioning in one axis, and in that the cover plate engages over the board laterally, whereby the board is positioned in two axes.

The attempt of a common optical system for all bulbs fails because a single optical system for all bulbs does not bring the necessary tolerance accuracy with it. So concatenate tolerance inaccuracies of light bulbs to bulbs, so that no later than after a plurality of bulbs, there is an inaccuracy that can no longer ensure the desired defined light orientation by influencing the beam path.

Another disadvantage of known systems is that, in addition to the impossibility of simplification, the high complexity of the large number of individual optical systems leads to an increased installation effort and increased manufacturing costs. The higher complexity of the entire system also entails the risk of reduced functionality.

Presentation of the invention

It is an object of the present invention to at least partially overcome the disadvantages of known light modules described above. In particular, it is an object of the present invention to provide a light module for an outdoor light, as well as an outdoor light comprising a light module and a positioning method, which in a cost effective and simple manner a single component with a plurality of optical systems in the most accurate possible alignment with the plurality of bulbs allows.

The above object is achieved by a light module having the features of independent claim 1, by an outdoor lamp having the features of independent claim 7 and by a method having the features of independent claim 8. Further features and details of the invention emerge from the dependent claims, the description and the drawings. In this case, features and details that are described in connection with the light module according to the invention apply, of course, in connection with the outdoor lamp according to the invention and with the inventive method and in each case vice versa, so that with respect to the disclosure of the individual aspects of the invention always reciprocal reference is or may be ,

A light module according to the invention for an exterior light has a board receptacle and at least one circuit board arranged in the circuit board receptacle. On the board a variety of light sources, in particular in the form of LEDs (Light Emitting Diodes) is arranged. In order to protect the board and the bulbs, a cover is provided which the board receptacle as well covers the board arranged therein and has a lens. The lens is at least partially translucent to allow the light generated by the bulb through. In particular, the lens may be made of plastic or glass to produce the desired translucency.

A light module according to the invention is characterized in that an optical system for influencing the beam path through the lens is arranged in the lens for each light source. Furthermore, the cover has at least three positioning means for a specific positioning of the cover plate relative to the circuit board. Under the influence of the beam path through the lens is in the context of the present invention, a bending and / or reflecting a light beam to understand, which has been generated by a light source. In this case, an association can be recognized between each optical system and each illuminant. If, for example, 64 light sources are present, 64 optical systems are also arranged in the lens. In this case, the optical systems can be both one-piece, ie integral or monolithic component of the lens, or else be attached separately from this lens only on the lens.

A certain positioning is to be distinguished in the context of the present invention from a specific storage. Under a certain positioning is to be understood that a relative movement between the board and lens is no longer possible. In particular, a relative movement in all three axes, as well as a relative rotation about the three axes is prevented. This determines the positioning, whereby there is a separation of the functionality of the cover from the functionality of the positioning. In this way, the cover can be made, and in particular a sealing of the interior space between the cover and the board receptacle be possible. At the same time and independently of this, the positioning takes place via the three positioning means. The three positioning means are arranged such that in particular they allow positioning with the smallest possible tolerance ranges. The position and the distance between the individual positioning means are chosen such that the shortest possible tolerance chains result. In contrast to known light modules can be achieved by the inventive arrangement of the three positioning means a certain positioning without high tolerance error chains occur. In this way, it is possible to provide the plurality of optical systems in the lens, so that together with the cover and thus together with the lens all optical systems are placed simultaneously. This reduces the complexity of the assembly. In addition, since only a single component, namely the cover with the lens, must be mounted, and the cost of production is reduced, as compared to 64 in the prior art 64 individual steps with 64 individual optical systems as 64 individual components are applied had to.

The sealing of the cover in a light module according to the invention is carried out for example by adhesive or by an O-ring, so that in addition to the contact areas between the cover and the board receiving a seal. The adhesive is additionally to be understood as a fastening means, so that the cover can be held in the covering position by the cured adhesive.

In the context of the present invention, the cover and as well as the cover plate can each be designed in several parts. In particular, however, these are connected to form a unit, which can be either non-positive, cohesive or even integral or monolithic. The individual positioning means are preferably with inlet slopes or Insertion provided, which allows an even easier positioning, in particular the insertion of the positioning in corresponding counter positions.

According to the invention, at least one positioning means for positioning in three axes, at least one positioning means for positioning in two axes and at least one positioning means for positioning in one axis are formed. In other words, it is a so-called 3, 2, 1 positioning, with positioning in three axes, one in two axes and one in one axis. In this case, for example, with a designation of the axes with X, Y and Z, a positioning can take place three times in the Z-axis, twice in the Y-axis and once in the X-axis. Of course, the axes can also be named differently or different distributions occur. Decisive, however, is the design of the 3, 2, 1 positioning for this embodiment. In this case, a minimum is to be understood by this 3, 2, 1 positioning in order to achieve the specific positioning according to the invention. By setting the positioning three times, for example, in the Z axis, so to speak, a tripod is realized, as is known in chairs and tables. In addition, in order to prevent displacement and tilting of the tripod, in addition to the double positioning in the Y-axis and the simple positioning, for example, in the X-axis are provided. Here it is easy to see that a certain storage differs from a certain positioning. Thus, for a particular positioning a variety of other requirements is necessary than for a particular storage, for example in the form of a tripod, the case.

A light module according to the invention may be developed in such a way that at least two positioning means for positioning in one axis and at least two positioning means for positioning in two axes are arranged at the same or substantially equal distance from the positioning means for positioning in three axes. In other words, here is one Doubling beyond the necessary level of positioning. In particular, in order to further reduce the tolerance chains and accordingly to minimize error rates, this embodiment can be used. In addition, it achieves a positive optical effect when a substantially symmetrical arrangement of the positioning means to each other. Since the end disk is an at least partially transparent component, the arrangement of the respective positioning means becomes visible from the outside. The symmetry is a particularly pleasing optical arrangement of the individual positioning means to each other. Here, a static overdetermination is actually provided, which however brings great advantages for stability reasons. In particular with regard to possible thermal stresses in the individual components and, accordingly, associated shifts in the individual components, such a multiplication of the individual positioning means is likewise advantageous.

It may also be advantageous if, in the case of a light module according to the invention, the board has a positioning opening assigned to each positioning means, through which the respective positioning means extends. In other words, the possibility of positioning results here by the correlation between positioning and positioning. In particular, the type of positioning opening is adapted to the type of the respective positioning, ie in particular to the number of positioning axes. The arrangement of positioning openings in relation to the positioning means, the protrusion of the positioning means can be achieved, whereby the entire configuration of the light module can be made even flatter. A flatter light module, by the nesting of the individual components results in a smaller space in the outdoor lamp, as well as a smaller space required for storage and transport of the light module is required.

It is also advantageous if, in a light module according to the invention, at least one positioning opening limits the freedom of movement of the associated positioning means in one axis, at least one positioning opening limits the freedom of movement of the associated positioning means in two axes and at least one positioning opening limits the freedom of movement of the associated positioning means in three axes. In other words, the 3, 2, 1 positioning already described above is achieved by the correlation of the positioning means with the positioning openings. In particular, the inventive freedom of movement is achieved by the corresponding design of the opening cross-section of each positioning hole. For example, different directions for the positioning means can be enabled or blocked. By forming circular openings adapted to the dimension of the positioning means, the freedom of movement in two axes can be limited if an additional stop in the board as well as in the board receptacle can restrict the third axis with regard to freedom of movement. The provision of a slot reduces the restriction about an axis, while a circular arrangement with a significantly larger cross-section of the positioning opening with respect to the positioning means increases the restriction by a further degree of freedom for freedom of movement. This embodiment is particularly simple and inexpensive, and in addition to the need for particularly small space very accurate tolerances can be maintained even in the production of the positioning as well as in the positioning without great expense.

It is a further advantage if, in the case of a light module according to the invention, at least one of the positioning means has a fastening means which fixes the cover to the board receptacle. Such a fastening means may be for example a screw or a rivet. In particular, this fastener protrudes through the positioning means, and mechanically fastened stable the cover, especially the lens, with the board receptacle. If the cover is connected to the board receptacle with the aid of an adhesive or another hardenable material, there would be a risk that during the hardening of this material a displacement or bulging of the cover takes place. This would lead to unwanted relative movement between the board and the cover, in particular the lens, so that the risk would exist that the desired degree of influence of the beam path through the lens would no longer be guaranteed by the optical systems. Accordingly, the screw or the other fastening means can be understood as a kind of security during the manufacturing process, in order to ensure and maintain the desired relative position between the board and the lens even at higher temperature fluctuations than expected in use.

Another advantage is when, in a light module according to the invention, the board receptacle has a planar abutment for the board and on the outside of the board receptacle, which faces away from the board, cooling fins are arranged. This leads to a back cooling of the board and thus also of the light source is possible. It can also be seen here that the planar abutment brings with it the essentially statically determined mounting of the board, while according to the invention the positioning means are a specific positioning of the board receptacle. In addition, however, can be achieved by positioning in a Z-direction on this abutment to an improved surface contact between the board and the board receptacle, so that in the desired manner, the planar abutment is also available as a heat transfer surface substantially full area available. In particular, with bulbs in the form of LEDs can be achieved in this way an effective removal of the heat generated, so that the life of the individual light sources, in particular the LEDs, is further increased.

In the light module according to the invention, the at least three positioning means are formed integrally, in particular monolithically, with the cover disk. Under an integral or monolithic training is an integral or cohesive training of a single material or different materials to understand. In particular, the lens is produced, for example, by an injection molding process, wherein in the one-component or two-component injection molding process, the three positioning means are produced directly together with the lens in the injection molding. This reduces on the one hand the costs and the effort of producing the lens and on the other hand the complexity of the entire component. The positioning means are part of the lens, as is the case in particular with the optical systems. Thus, as in the case of known light modules, the cover disk can also be used, with the individual positioning means preferably carrying out the positioning in a specific manner, preferably essentially automatically. This assembly is possible, as it is carried out in known light modules, so that the person installing does not need to perform relearning. Thus, the complexity of the production and thus the probability of mispositioning of the lens are reduced.

Another object of the present invention is an outdoor lamp having at least one inventive light module. Accordingly, such an outdoor lamp brings the same advantages as have been explained in detail with reference to a light module according to the invention.

• Anordnen einer Platine mit einer Vielzahl von Leuchtmitteln in einer Platinenaufnahme,
• Bestimmtes Positionieren einer Abdeckung mit einer Abschlussscheibe, die die Vielzahl der optischen Systeme aufweist, für die Platinenaufnahme und die Platine mit Hilfe von wenigstens drei integral mit der Abschlussscheibe ausgebildeten Positioniermitteln.

Likewise provided by the present invention is a method for the positioning of a plurality of optical systems relative to a multiplicity of illuminants, in particular LEDs, of a light module. Such a method comprises the following steps:

• Arranging a board with a plurality of bulbs in a board receptacle,
• In particular, positioning a cover with a lens comprising the plurality of optical systems for the board receiver and the board by means of at least three positioning means integrally formed with the lens.

By virtue of the fact that positioning of the plurality of optical systems relative to the lighting means takes place by means of a method according to the invention, simplified mounting can take place. In addition, can be guaranteed by a single component by this positioning method, the cover or the lens with the optical systems. This reduces the cost of producing such a cover. In particular, an inventive method for positioning in a light module according to the invention is formed. Accordingly, such a method brings the same advantages as have already been explained in detail with respect to a light module according to the invention.

Description of the drawings

Figur 1

in schematischer Darstellung eine Ausführungsform einer erfindungsgemäßen Außenleuchte,

Figur 2

eine Ausführungsform eines erfindungsgemäßen Lichtmoduls,

Figur 3a

eine Ausführungsform eines Positioniermittels,

Figur 3b

das Positioniermittel der Figur 3a in schematisch perspektivischer Darstellung,

Figur 3c

im Querschnitt eine Ausführungsform eines erfindungsgemäßen Lichtmoduls,

Figur 4

in schematischer Explosionsdarstellung eine Ausführungsform eines erfindungsgemäßen Lichtmoduls,

Figur 5a

in schematischem Querschnitt eine Ausführungsform einer Abschlussscheibe,

Figur 5b

eine Ausführungsform einer Positionieröffnung,

Figur 5c

eine weitere Ausführungsform einer Positionieröffnung und

Figur 5d

eine weitere Ausführungsform einer Positionieröffnung.

The present invention will be explained in more detail with reference to the accompanying drawing figures. The terms "left", "right", "top" and "bottom" used herein refer to an alignment of the drawing figures with normally readable reference numerals. Show it:

FIG. 1

a schematic representation of an embodiment of an outdoor lamp according to the invention,

FIG. 2

an embodiment of a light module according to the invention,

FIG. 3a

an embodiment of a positioning means,

FIG. 3b

the positioning of the FIG. 3a in a schematic perspective view,

Figure 3c

in cross section an embodiment of a light module according to the invention,

FIG. 4

in an exploded schematic representation of an embodiment of a light module according to the invention,

FIG. 5a

a schematic cross-section of an embodiment of a lens,

FIG. 5b

an embodiment of a positioning opening,

FIG. 5c

another embodiment of a positioning and

FIG. 5d

another embodiment of a positioning hole.

In FIG. 1 an embodiment of a light module 10 according to the invention in an outdoor lamp 100 according to the invention is shown. Here it can be seen that one or more such light modules 10 can be used in an outdoor light 100 to illuminate a certain area.

The individual light modules 10 may be formed, for example, as described below. So shows FIG. 2 an embodiment of a light module 10, wherein through the transparent cover 41 through the circuit board 30 can be seen. On the board 30, a plurality of lamps 32 are arranged in the form of LEDs. In addition, 30 corresponding conductor tracks are arranged on the board, which, in FIG. 2 not shown, each LED, so each bulb 32, provide power.

Also in FIG. 2 It can be seen that the board receptacle 20 receives the board 30 and beyond, seen in this view, the positioning means 60 act on the positioning of the lens 41. In this embodiment, a total of five positioning means 60 are provided, which are aligned substantially symmetrically to each other on the center so the central shape of the positioning means 60. Here, the positioning means 60 in the middle is a positioning in three axes, while the remaining positioning means are designed for positioning in two axes or in one axis.

The FIGS. 3a and 3b show an embodiment of a positioning means 60, as positioning means 60c for a positioning in three axes. This is in particular the positioning means 60, which in FIG. 2 is provided in the middle. Here it can be clearly seen that in the circuit board 30, a positioning opening 34 is provided, through which the positioning means 60c projects for positioning in three axes. In addition, this positioning means 60 is also held in a recess of the board receptacle 20 and also provided with a seal 70. One recognizes in FIG. 3a It is also good that between the board receptacle 20 and the positioning means 60, the board 30 is clamped. Accordingly, a positioning in the Z direction, ie in FIG. 3a from bottom to top or from top to bottom. The positioning in the X and Y direction will be described later with reference to FIGS Figures 5b, 5c and 5d explained in more detail.

So it is in FIG. 5b the variant of pure positioning in one axis, namely in the Z-axis. About the positioning means 60a for positioning about an axis around a safety distance of about 2 mm as a game, so that no fixation in these two axes X and Y, which is the plane of the plane of the plane FIG. 5b represent, takes place. In FIG. 5c the variant is shown in which the positioning opening 34 is designed substantially as a slot.

Here, a positioning takes place in two axes, ie in the Z-axis and in the Y-axis or the X-axis. The second axis of the drawing plane of the FIG. 5c is free, so that the positioning means 60b can move freely for positioning in two axes along the slot. If this last degree of freedom of movement is also taken, then, for example by reducing the positioning opening 34 to a circle without play around the positioning means 60, the variant as shown by way of example in FIG FIG. 5d is shown. In this case, the positioning means 60c is set for positioning in three axes in all directions, so that there is no longer any degree of freedom with respect to a movement. By the sum of the arrangement of the individual positioning means, that is to say in particular a positioning means 60a for positioning in one axis, a positioning means 60b for positioning in two axes and a positioning means 60c for positioning in three axes, it is achieved that a specific positioning of the cover disk 41 relative to the board 30 is possible. This brings about the advantages according to the invention that no tolerance chains are produced and, moreover, a relative position determination for the individual optical systems 50 relative to the luminous means 32 can take place.

In FIG. 3a It can also be seen that a fastening means 62 is provided which fixes the cover disk 41 on the board receptacle 20 as a screw. In particular during production, this serves to prevent possible bulges or deformations of the end disk 41, which would otherwise alter the defined positioning of the end disk 41.

In Figure 3c It can be seen that the board receptacle 20 has cooling ribs 22 on its rear side. By a planar abutment for the board 30 heat can be delivered to the board receptacle 20, which in turn is discharged via the plurality of cooling fins 22. This leads to an increased lifetime of the individual lamps 32.

In FIG. 4 a variant of an embodiment is shown, which is shown in exploded view. Here, the cover plate 41 is shown as part of the cover 40 is not mounted. However, the individual positioning means 60 are shown in the form of the positioning means 60a, 60b and 60c. This is an overestimation for positioning, since two positioning means 60a are provided for one-axis positioning and two positioning means 60b are for two-axis positioning. This leads to an improvement in terms of possible thermal stresses and prevents a shift of the relative positions of the board 30 and the end plate 41 to each other. In addition, an improved, in particular symmetrical seeming, optics is achieved.

In FIG. 5a a variant in schematic cross section for a cover 41 is shown. Here it can be seen that, for example, by bulges on the lens 41, an optical system 50 can be achieved, for example in the form of a lens. Such a lens serves to be positioned, in particular in the focal point between the illuminant and the lens, so that a particularly effective influencing of the beam path, starting from the illuminant 32 when passing through the lens 41 is possible.

The preceding description of the invention with reference to embodiments describes this only in the context of examples. Of course, the individual features, if technically feasible, can be combined freely with one another without departing from the scope of the present invention, as defined in the claims.

LIST OF REFERENCE NUMBERS

10

light module

20

platinum recording

22

cooling fins

30

circuit board

32

Lamp

34

positioning

40

cover

41

lens

50

Optical system

60

positioning

60a

Positioning means for positioning in one axis

60b

Positioning means for positioning in two axes

60c

Positioning means for positioning in three axes

62

fastener

70

poetry

100

outdoor light

Claims (8)

1. Light module (10) for an exterior lamp (100), comprising a circuit board receiving portion (20), at least one circuit board (30) arranged in the circuit board receiving portion (20) with a plurality of illuminants (32), particularly in the form of LEDs, and a cover (40) covering the circuit board receiving portion (20) as well as the circuit board (30) arranged therein and comprising a translucent cover pane (41) for transmitting the light generated by the illuminant (32), wherein for each illuminant (32) an optical system (50) for the manipulation of the beam path through the cover pane (41) is arranged in the cover pane (41), and the cover (40) comprises at least three positioning means (60) for defined positioning of the cover pane (41) relative to the circuit board (30),
   wherein
   at least one positioning means (60c) is formed for positioning in three axes, at least one positioning means (60b) is formed for positioning in two axes, and at least one positioning means (60a) is formed for positioning in one axis,
   characterized in that
   the at least three positioning means (60) are formed integrally with the cover pane (41).
2. Light module (10) according to claim 1,
   characterized in that
   at least two positioning means (60a) for positioning in one axis and at two positioning means (60b) for positioning in two axes are arranged with in equal or substantially equal distance to said positioning means (60c) for positioning in three axes.
3. Light module (10) according to one of the preceding claims,
   characterized in that
   the circuit board (30) comprises for each positioning means (60) a positioning opening (34) being associated with the respective positioning means (60), and in that the respective positioning means (60) protrudes through the positioning opening (34).
4. Light module (10) according to claim 3,
   characterized in that
   at least one positioning opening (34) restricts the freedom of movement of the associated positioning means (60a) in one axis, at least one positioning opening (34) restricts the freedom of movement in of the associated positioning means (60b) in two axes, and at least one positioning opening (34) restricts the freedom of movement of the associated positioning means (60c) in three axes.
5. Light module (10) according to one of the preceding claims,
   characterized in that
   at least one of the positioning means (60) comprises a fastening means (62) which fastens the cover (40) at the circuit board receiving portion (20).
6. Light module (10) according to one of the preceding claims,
   characterized in that
   the circuit board receiving portion (20) comprises a planar abutment for the circuit board (30), and that cooling ribs (22) are arranged on the outside of the circuit board receiving portion (20) which is facing away from the circuit board (30).
7. Exterior lamp (100) comprising at least one light module (10) with the features of one of claims 1 to 6.
8. A method for positioning a plurality of optical systems (50) relative to a plurality of illuminants (32), particularly LEDs, of a light module (10), comprising the following steps:

   - Arranging a circuit board (30) with a plurality of illuminants (32) in a circuit board receiving portion (20),

   - Accurate positioning of a cover (40) comprising a cover pane (41) which comprises the plurality of optical systems (50), for the circuit board receiving portion (20) and the circuit board (30) employing at least three positioning means (60) formed integrally with the cover pane
   wherein
   the cover is positioned by means of at least one positioning means (60c) for positioning in three axes, by means of at least one positioning means (60b) for a positioning in two axes, and by means of at least one positioning means (60a) for a positioning in one axis.

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