WO2014079424A1

WO2014079424A1 - Radar device for a vehicle

Info

Publication number: WO2014079424A1
Application number: PCT/DE2013/200240
Authority: WO
Inventors: Ronald Becker
Original assignee: Conti Temic Microelectronic Gmbh
Priority date: 2012-11-20
Filing date: 2013-10-21
Publication date: 2014-05-30
Also published as: DE102012111184A1; DE112013005543A5

Abstract

The invention relates to a radar device (10) for a vehicle, comprising a pan-shaped housing (7) that can be closed by means of a housing cover (8), a first circuit board (4) for receiving an antenna and high-frequency components that is arranged in the housing (7) and positioned by means of contact elements (7d) against a housing bottom (7c), a second circuit board (5) for receiving low-frequency components, and a shielding device (1) that is arranged between the two circuit boards (4, 5) and has an electromagnetically shielding property. According to the invention, the shielding device (1) consists of two hood-like shields (2, 3) arranged adjacent to one another, covering the first and second circuit boards (4, 5) and having resilient properties in the direction perpendicular to the circuit boards, and the shielding device (1) is designed to support itself under spring tension against the second circuit board (5), which is positionally fixed in the housing (7), and against the first circuit board (4), wherein the first circuit board (4) subjected to spring force is held pressed against the contact elements (7d) of the housing (7).

Description

Radar device for a vehicle

The invention relates to a radar device for a vehicle according to the preamble of patent claim 1.

Radar devices for vehicles are known from the prior art and are used, for example, to determine a distance to vehicles in front.

A generic radar device is known from DE 10 2007 042 173 AI, in which in a trough-shaped housing two printed circuit boards, namely a printed circuit board with a Ra ^¬ darantenne and high-frequency components (Hochfrequenzlei- terplatte) and another printed circuit board with Niederfre ^¬ quenzbauelementen (low-frequency circuit board) added become. The bottom of the trough-shaped housing is designed as a radome. The two circuit boards of this known radar device are connected to a carrier by means of screws and then used with this carrier in the housing, wel ^¬ Ches is closed with a housing cover. The support for the two printed circuit boards consists of a shielding surface enclosing a frame part, the radome side ^¬ front has a support surface for the first circuit board, wherein molded on the shielding ribs together with the shielding and the first circuit board chambers ^¬ the ^¬ . On the opposite side of the carrier, the further printed circuit board is inserted into the frame part and screwed to the carrier, so that at the same time via a ^{breakthrough ¬} the shielding a plug connection with the first circuit board can be made. Also the first ladder plate is connected to the carrier via a screw connection.

This carrier with the two printed circuit boards is inserted into the housing, so that the first printed circuit board rests on the corner of the housing lying, forming a support plane support ^¬ post and the support can be screwed to other support post. With the insertion of the carrier into the housing formed as a press-Kontaktstif- te be a front-side plug into corresponding connection holes ^¬ on the second circuit board for electrical contact clocking of pressed.

As radar frequencies for such radar devices 24 GHz or 77 GHz are used, the problem is that the distance between the arranged on the front of the radio-frequency circuit board antenna and the radom ausgebil ^¬ Deten tub bottom of the trough-shaped housing is tolerance critical.

Furthermore, the use of the contact pin press-in technology for contacting the low-frequency printed circuit board via a connector in the direction perpendicular to the printed circuit board due to process engineering requirements is also tolerance critical. Therefore, these two spaced-apart printed circuit boards, so the high-frequency circuit board and the low-frequency circuit board must be positioned in the vertical direction exactly to each other. In the known radar device according to DE 10 2007 042 173 Al, this is achieved in that the two Leiterplat ^¬ th in the carrier fixed by appropriate support levels and bolted to the carrier. The disadvantage, however, is that the bearing levels of the carrier must meet close tolerances to each other. In order to maintain an exact distance between the antenna carrying high-frequency circuit board and formed with the radome tub bottom of the trough-shaped housing, and the supporting plane of the Hochfre ^¬ quenzleiterplatte or the support forming support posts are to be made with tight tolerances.

Based on this prior art, it is an object of He ^¬ invention to provide a radar device of the type mentioned, with which a defined distance between the radome of the radar device and the radar antenna supporting circuit board and at the same time a defined position of the two circuit boards is ensured.

This object is achieved by a radar device having the features of patent claim 1.

Such a radar apparatus for a vehicle, comprising a closable by a housing cover trough-shaped Ge ^¬ housing, means disposed within the housing relative to a housing floor positioned by means Anlageelemen ^¬ th first circuit board for receiving an antenna and Hochfrequenzbauele ^¬ elements, a second circuit board for receiving Niederfre ^¬ quenzbauteilen, and arranged between the two circuit boards, an electromagnetic shielding property comprising shielding, according to the invention is characterized in that the shield of two adjacent, the first and second circuit board abde ^¬ ckenden hood-shaped shields in the direction perpendicular to the Printed circuit board having resilient properties, and the shielding device is formed, spring biased on the one hand against the in the housing. se position-fixed second circuit board and on the other hand to support against the first circuit board, wherein the

spring-loaded first printed circuit board is pressed against the contact elements of the housing is held.

The above-mentioned problems according to the invention in a surprising and simple manner and thus inexpensively solved in that resiliently abutting shields between the antenna carrying the first circuit board, so the high-frequency circuit board and the second circuit board, ie the low-frequency circuit board are arranged as shielding, whereby a tolerance compensation between These two circuit boards takes place, however, a well-defined distance to the housing bottom of the housing, which is preferably designed as a radome, is maintained.

Furthermore, the position of the second printed circuit board, ie the low-frequency printed circuit board, is also precisely defined, since this is fixed in position with respect to the housing and thereby the tolerance requirements for the contact pins of a plug for making electrical contact with the second printed circuit board designed as press-fit contacts are met. In this case, the Ge ^¬ housing for fixing the position of the second circuit board weiterbil ^¬ tion according to a contact surface, which is dominated by the same in the non-spring biased state of the shielding device. For a simple and reliable installation of the radar device is possible because with the installation of the

Housing cover on the trough-shaped housing, the second Lei terplatte ^¬ pressed against the contact surface and is brought about the contact with the shielding the same in its spring-biased state. In a further advantageous embodiment of the invention, a spacer between the shields of the shielding device is provided to realize the resilient property of the shielding, which causes in senkrech- ter to the circuit board levels of the two circuit boards, a mutual resilient attachment of the two shields.

In one embodiment of the invention, one of the rules shield- a substantially central elevation than ^¬ distance holder between the two printed circuit boards. The integration of the spacer in one of the two shields facilitates the manufacture of the shielding device. Preferably, for this purpose, the survey is formed trough-shaped with a substantially flat bottom.

Furthermore, it is particularly advantageous if a shield has two projecting fixing grips according to a white ^¬ more advanced embodiment of the invention at least, the relative laser gefixierung to the two shields in fixing holes of the adjacent shield engage. This facilitates the assembly of the radar device according to the invention, in particular the insertion of the two shields into the housing. The fixing openings are preferably arranged in the region of the centric elevation.

Advantageously, according to one embodiment of the invention, the surface of the circuit board with the circuit board serving edge of a shield is formed such that the circuit board is peripherally rotated by this edge.

Furthermore, it is provided according to an embodiment of the invention that the two shields congruent openings to realize a plug connection. Thus, during assembly of the radar device, the two printed circuit boards can be connected to one another via a plug and a socket. In this case, preferably, the opening of the shield covering the first circuit board is formed with resiliently acting in the direction of the first circuit board spring tabs. Thus, in this area of the connector, an EMC shield realized by means of an RF tube ^¬ who, which is held by means of these spring tabs.

A particularly cost-effective production of the Abschirmvor ^¬ direction is further development achieved in that the shields are each formed as a deep-drawn sheet with a peripheral wall and a projecting edge as a support surface for the circuit board. Here preferably also the He ^¬ elevation is produced as a spacer in the plane of the shield of circular cross section by deep drawing.

A particularly simple embodiment of the invention is achieved in that the two shields are materially connected in the region of the central elevation. Preferably, this is done by means of a

Clinching, also called Tox ^® compound realized. As above already mentioned, the housing bottom is far erbil ^¬ dung accordance trained as a radome.

The invention will now be described in detail with reference to an Ausführungsbei ^¬ game with reference to the accompanying figures. Show it:

FIG. 1 is an exploded view of a radar device according to the invention, 2 shows a perspective view of a shielding device of the radar device according to FIG. 1, FIG. 3 shows an exploded view of the two shields of the shielding device according to FIG. 2,

Figure 4 is a plan view of the shielding device according to

FIG. 2,

5 shows a sectional view according to section A-A of the shielding device according to FIG. 4, FIG.

FIG. 6 shows a perspective illustration of the radar device according to FIG. 1 in the assembled state, and FIG

Figure 7 is a sectional view taken along section BB of the radar device of Figure 6. The fully assembled in Figure 6 Radarein ^¬ direction 10 consists of Figure 1 from a trough-shaped housing 7 with a housing bottom 7c connected side walls 7a and 7b and a housing cover 8. From this Ge ^¬ housing 7 will share with HF Hochfrequenzbau- a first circuit board 4 and incorporated a thereof by means of a resilient shielding device 1 spaced arranged second printed circuit board 5 with low frequency components NF. Therefore, in the following, the first printed circuit board 4 is also called high-frequency printed circuit board or the second printed circuit board 5 also low-frequency printed circuit board. The high-frequency circuit board 4 carries housing bottom side a radar antenna and a shield 6 from ^¬ , since on this side of the first circuit board. 4 as well as high frequency components are arranged. The housing bottom 7c of the housing 7 is formed as a radome.

The parallel side walls 7a of the housing 7 are formed as longitudinal side walls and the parallel side walls 7b as transverse side walls. On a transverse side wall 7b, a female connector 9 is formed, the plug contacts are guided in the Ge ^¬ housing 7 and bent there bent at right angles in press-fit pins 9a. This area with the press-fit pins 9a is separated from the remaining area of the housing by a further transverse side wall 7b ^y, which runs parallel to the plug socket and has a transverse side wall 7b. Furthermore, post-like contact elements 7d are formed in the edge regions of the housing bottom 7c of the housing 7, each forming a contact surface for the first printed circuit board 4 to be inserted into this housing 7.

According to FIGS. 2 and 3, the shielding device 1 comprises two hood-shaped shields 2 and 3 which respectively consist of a side wall 2a or 3a encircling a shielding bottom 2c or 3c and a projecting edge 2b or 3b of the side wall 2a or 3a , This projecting edge 2b and 3b of the shield 2 and 3 forms a bearing surface on the edge in the mounted state of the radar device 10, the circuit board 4 and 5 according to FIG 7, so that arranged on the circuit boards 4 and 5 Hochfrequenz- or Low-frequency components HF or NF covered and thus be screened electromagnetic ^¬ table. In order to realize a resilient property between the edges 2b and 3b of the shields 2 and 3, which respectively form a support surface for the printed circuit boards 4 and 5, these shields 2 and 3 lie above their shielding bottoms 2c and 3c spaced from each other, wherein for realizing a distance a according to FIG. 5, the shielding bottom 3c has a centrally arranged elevation 3d as a spacer, as can be seen in particular from the sectional illustration according to FIG. This raised in the direction of the shield 2 elevation 3d is formed according to Figure 4 with a circular cross-section with a flat contact surface 3f, against which the shielding bottom 3c of the shield 3 rests surface-locking.

Since the two shielding floors 2c and 3c are only partially in contact via this elevation 3b, the two shielding floors 2c and 3c can oscillate elastically perpendicular to their planes when the pressure is applied to the edges 2b and 3b of the shields 2 and 3.

For mutual fixation of the two shields 2 and 3, the shielding bottom 2c two with a short distance

spaced Fixiernoppen 2d, which engage in corresponding arranged in the area of the survey 3d, formed as a dome-shaped Ausstülpun ^¬ gene fixing holes 3f.

Furthermore, the two shields 2 and 3 each have an opening 2e and 3g, which serve to electrically connect the two printed circuit boards 2 and 3 via a plug connection. In order to realize an EMC shielding in this area of the connector as well, an HF tube (not shown in the figures) is provided, which is held by means of spring tabs 2f formed on the edge of the opening 2f.

The two shields 2 and 3 are manufactured as deep-drawn sheet metal parts. This is how it works with a thermoforming process also the elevation 3d as a spacer of the shield 3 and the dome-like fixing holes 3e produced; In the same way, the shield 2 is manufactured together with the Fixiernoppen 2b in a deep drawing process.

The two shields 2 and 3 of the shielding device 1 are connected to each other via the Fixiernoppen 2d and the fixing holes 3e non-positively. Such a compound may, for example, by means of a clinch connection, also known as Tox ^® connection can be realized.

The assembly of the radar device 10 begins with that first the high-frequency circuit board 4 ^¬ loaded in the housing 7 is inserted, so that they sheet members on the housing 7 arranged in the arrival flies up 7d. This first circuit board 4 has a length in the direction of the longitudinal side walls 7a, so that the press-fit pins 9a of the socket 9 are guided past this ers ^¬ th circuit board 4 and therefore this first circuit board 4 in this area in the by the with the further transverse side wall 7b ^y and the side walls 7a and 7b ge ^¬ formed space can be inserted, as can be seen from Figure 7.

Subsequently, the screening arrangement 1 with the verbunde- NEN shields 2 and 3 is set to this first circuit board 2 on ^¬, so that the edges 2b of the shield 2 rests peripherally on the edge side of this first printed circuit board. 4 In this case, this shielding device 1 with the two shields 2 and 3 is dimensioned such that the support surface for the second circuit board 5 serving edge 3b slightly protrudes on the Be ^¬ tenwänden 7a and 7b and 7b ^{y of} the housing 7 arranged on ^¬ bearing surface 7e , The low-frequency printed circuit board 5 will now be placed on the compounds used as plant ^¬ surface edge 3b of the shield 3, wherein this printed circuit board 5 extends with an edge portion 5a on the severed from the transverse side wall 7b ^y region, so that this the grouting for the press-in terminations 9a-tasting edge region 5a of the second circuit board 5 is not covered by this shielding 3 and when inserting this low-frequency circuit board 5 in the housing 7, the one ^¬ press pins 9a in the lying in the area 5a Einpressöffnun- conditions of the second circuit board 5 are partially pressed. Thus, this second circuit board 5 is longer compared to the first circuit board 4 to this area 5a. In this state, there is a small distance between this second printed circuit board 5 and the circumferential contact surface 7e on the side walls 7a and 7b or 7b ^{y of} the housing 7.

To close the housing 7, the housing cover 8 is placed on the second circuit board 5 and the side walls 7a and 7b of the housing 7 and screwed by screws 8c to the housing 7 corner, so that according to Figure 7, the second circuit board 5 by a circumferential ridge is pressed on the abutment plane 7e 8a and fixed in this position and also the screening device 1 is compressed to produce a spring force, since the first conductor abuts plate 4 to the contact elements 7d and thus serves as Ge ^¬ cheek displaced. In addition, in this assembly process, the press-in pins 9a are pressed into the press-in openings area 5a of the second circuit board 5 in its final position. This is in the closed state of the housing 7, the shielding device 1 in the prestressed state, ie when due to the screw connection of the housing cover 8 with the housing 7, the second circuit board 5 on the contact surface 7e is applied, so that thereby the first circuit board 4 is pressed against the contact elements 7d.

The thus-mounted radar device 10 is held office on the lid mounting screws 8 8d mounted to the vehicle body ^¬ a vehicle.

The housing 7 can be formed as a basic material housing, wherein the housing cover 8 is realized metallic or with so that even in the mounted state on the housing side printed circuit board side of the second circuit board 5 arranged low-frequency components are also shielded electromagnetically. On the outside, such a housing cover is equipped with cooling fins 8b for better heat dissipation.

Reference sign

1 shielding device

2 Shielding of the shielding device

2a side wall of the shield 2

2b edge of the shield 2

2c Shielding bottom of the shield 2

2d fixing naps

2e opening in the shield 2

2f spring tabs at the opening 2d

3 Shielding of the shielding device

3a side wall of the shield 3

3b edge of the shield 3

3c Shielding bottom of the shield 3

3d spacers, survey

3e fixing opening

3f opening in the shield 3

4 first circuit board, high frequency circuit board

5 second circuit board, low frequency circuit board

5a edge region of the printed circuit board 5 with press-in openings

6 shielding

7 housing of the radar device

7a side wall of the housing 7

7b side wall of the housing 7

7b ^y side wall of the housing 7th

7c housing bottom of the housing 7

7d contact elements of the housing 7

7e contact surface of the housing 7

8 housing cover of the housing 7

8a circumferential web of the housing cover. 8

8b cooling fins of the housing cover 8

8c screw

8d mounting screws socket

Push-in pins of the female connector 9 radar device

Claims

claims

A radar device (10) for a vehicle, comprising:

a can-shaped housing (7) which can be closed by a housing cover (8),

a housing arranged in the housing (7), by means of Anlageele ^¬ elements (7d) with respect to a housing bottom (7c) positioning te first circuit board (4) for receiving an antenna and high-frequency components,

- A second circuit board (5) for receiving Niederfre frequency components, and

- a between the two circuit boards (4, 5) arrange te, an electromagnetic shielding property on ^¬ facing shielding device (1),

characterized in that

- The shielding device (1) consists of two adjacent, the first and second circuit board (4, 5) covering hood-shaped shields (2, 3) with in the direction perpendicular to the circuit boards having resilient properties, and

- The shielding device (1) is formed, spring biased on the one hand against the in the housing (7) position ^¬ fixed second circuit board (4) and on the other hand against the first circuit board (5) support, wherein the

spring-loaded first printed circuit board (4) pressed against the contact elements (7d) of the housing (7) is held

2. Radar device (10) according to claim 1, characterized in that the housing (7) for fixing the position of the two th printed circuit board (5) has a contact surface (7 e), wel che in the non-spring-biased state of the shielding device (1) is surmounted by the same ,

3. radar device (10) according to claim 2, characterized in that the housing cover (8) is formed to close the housing (7) under abutment of the second circuit board (5) on the contact surface (7 e).

4. radar device (10) according to any one of the preceding claims, characterized in that a spacer (3d) between the shields (2, 3) of the shielding device (1) is provided, which in the direction perpendicular to the PCB levels of the two circuit boards (4, 5) causes a mutual resilient attachment of the two shields (2, 3).

5. radar device (10) according to claim 4, characterized in that one of the shields (3) has a substantially ^¬ centric elevation (3d) as a spacer between the two circuit boards (4, 5).

6. radar device (10) according to claim 4 or 5, characterized in that the elevation (3d) is formed trough-shaped with a substantially flat bottom.

7. radar device (10) according to any one of the preceding claims, characterized in that a shield (2) has at least two protruding Fixiernoppen (2d), for the relative positional fixation of the two shields (2,

3) engage in fixing openings (3e) of the adjacent shield (3).

8. radar device (10) according to claim 7, characterized in that the fixing openings (3e) in the region of the central elevation (3d) are arranged.

9. radar device (10) according to any one of the preceding claims, characterized in that the surface of the circuit with the circuit board (4, 5) serving edge (2b, 3b) of a shield (2, 3) is formed, the circuit board (4 , 5) to run around the edge.

10. radar device (10) according to any one of the preceding claims, characterized in that the two Ab ^¬ shieldings (2, 3) congruent openings (2e, 3f) for realizing a plug connection.

11. radar device (10) according to claim 10, characterized in that the opening (2 e) of the first Lei ^¬ terplatte (4) shielding shield (2) in the direction of the first circuit board (4) resiliently acting spring tabs (2 f) is formed ,

12. radar device (10) according to any one of the preceding claims, characterized in that the Abschir ^¬ ments (2, 3) each as a deep-drawn sheet with a peripheral wall (2a, 3a) and a projecting edge (2b, 3b) as a support surface for the circuit board (4, 5) are formed.

13. radar device (10) according to claim 12, characterized in that the elevation (3d) is made in the plane of the shield (3) with a circular cross section by deep drawing.

14. radar device (10) according to any one of the preceding claims, characterized in that the two Ab- shieldings (2, 3) in the region of the central elevation (3d) are materially connected.

15. Radar device (10) according to claim 12, characterized in that the two shields (2, 3) are connected to ^{¬ means of} a clinch connection.

16. radar device (10) according to any one of the preceding claims, characterized in that the

Caseback (7c) is designed as a radome.