EP2027579A1 - Ultraschallsensor - Google Patents
UltraschallsensorInfo
- Publication number
- EP2027579A1 EP2027579A1 EP07725046A EP07725046A EP2027579A1 EP 2027579 A1 EP2027579 A1 EP 2027579A1 EP 07725046 A EP07725046 A EP 07725046A EP 07725046 A EP07725046 A EP 07725046A EP 2027579 A1 EP2027579 A1 EP 2027579A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- ultrasonic sensor
- housing portion
- housing
- material recess
- recess
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K9/00—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers
- G10K9/18—Details, e.g. bulbs, pumps, pistons, switches or casings
- G10K9/22—Mountings; Casings
Definitions
- the invention relates to an ultrasonic sensor, in particular a motor vehicle ultrasonic sensor, with a housing, with a membrane mounted in or on an annular portion of the housing, and with a decoupling element extending at least in sections between the diaphragm and the annular housing portion, wherein in the annular housing portion at least one material recess is provided.
- the membrane of such an ultrasonic sensor usually has a diaphragm bottom, which can be set in vibration by means of a piezoelectric element, so that ultrasonic signals can be radiated into the environment of the ultrasonic sensor. Ultrasound signals reflected by obstacles can be received and processed by the ultrasound sensor again.
- the membrane is not directly connected to the housing of the ultrasonic sensor, but surrounded by a decoupling material which borders radially outward on an annular housing portion of the ultrasonic sensor housing.
- the membrane can largely be decoupled vibration technology from the housing of the ultrasonic sensor. Nevertheless, there is a need to further improve the vibration behavior of the aforementioned ultrasonic sensor.
- the present invention has the object to provide an ultrasonic sensor with an optimal vibration behavior.
- the at least one material recess seen in the circumferential direction of the housing portion occupies at least 10% of the total circumference of the housing portion. This means that a single material recess or all
- Material recesses taken together can make up at least 10% of the total circumference of the housing section.
- material recesses arranged in the annular housing section can be used in order to interrupt the oscillation transmission path from the membrane via the decoupling material to the housing section. This is not possible with the water passage openings or Anspritzö réelleen described above, since they are too small to cause a detectable vibrational effect.
- vibrations in a radial direction to the main emission direction of the ultrasonic sensor can be interrupted. This has the consequence that incorrect measurements can be prevented or at least reduced. (Incorrect measurements have the consequence that in the environment of the ultrasonic sensor Obstacles are displayed that do not exist, so are obstructions. )
- the material recesses according to the invention furthermore have the consequence that the material thickness of the decoupling element can be reduced to a minimum extent. In turn, this makes it possible to produce very small ultrasonic sensors.
- a material recess is understood on the one hand to mean a material recess which does not completely pass through the annular housing portion in the radial direction.
- a material recess is also understood as meaning a gap or opening in the housing section which completely penetrates the housing section in the radial direction.
- the material recess is filled with a complementary shaped portion of the decoupling element.
- the decoupling material can be anchored mechanically stable in the housing portion.
- the complementarily shaped portion of the decoupling element can be flush with an outer surface of the housing portion close, so that a continuous, for example, substantially cylindrical circumferential surface can be formed.
- a circumferential surface is insensitive to contamination.
- such a circumferential surface can take place without preferential direction, which is advantageous for automated handling processes in production.
- the material recess is aligned with a radially reinforced edge portion of the membrane.
- the vibration decoupling can take place precisely in the areas in which a transmission of a vibration movement of the diaphragm to the housing is particularly critical and leads to the incorrect measurements described above.
- the decoupling effect can be further improved if the at least one material recess in the circumferential direction of the housing section occupies at least 30% of the entire circumference of the housing section. This means that a single material recess or all material recesses taken together can make up at least 30% of the entire circumference of the housing section.
- a further improvement of the decoupling effect is achieved with a proportion of at least 50%, more preferably of at least 70%.
- the material recess in the axial direction to the housing section has a smaller dimension than the dimension formed in the circumferential direction of the housing section. In this way, the housing section can build comparatively flat and yet a good decoupling between the membrane and the housing of the ultrasonic sensor can be achieved.
- the material recesses may be rectangular in particular. Such recesses can be found in
- a further advantageous embodiment of the invention provides that adjacent material recesses in the circumferential direction of the housing section are defined by web-shaped material sections. This means that the mutually adjacent material recesses occupy the majority of the circumferential surface of the housing portion and are interrupted only by said web-shaped material portions. In this way, the decoupling effect can be maximized.
- an optimal decoupling effect is achieved if the at least one material recess in the axial direction is delimited by an edge portion whose height corresponds in the axial direction to the housing portion at least approximately its material thickness in the radial direction.
- the edge portion has a profile which is designed such that it has approximately equal thicknesses in mutually perpendicular directions.
- Figure 1 is a perspective view of an ultrasonic sensor according to the invention.
- FIG. 2 shows a sectional side view of the ultrasonic sensor according to FIG. 1.
- an ultrasonic sensor is designated overall by the reference numeral 2.
- This has an approximately pot-shaped housing 4 (see also Figure 2).
- a substantially cylindrically shaped membrane 6 is mounted, which has a disk-shaped membrane bottom 8.
- the membrane 6 is surrounded radially on the outside by an annular decoupling element 10 which decouples the diaphragm 6 from the housing 4 in terms of vibration technology.
- the decoupling element 10 is mounted on the housing side on an annular housing portion 12, which surrounds a housing 4 facing part of the decoupling element 10 radially outside.
- annular housing portion 12 In the annular housing portion 12 are a plurality of approximately rectangular material recesses 14, 16, 18th and 20 and further, not visible in the selected perspective material recesses distributed over the circumference of the housing portion 12.
- the material recesses 14 to 20 extend on the one hand in an axial direction 22 marked in FIG. 2 and in the circumferential direction along the housing section 12. In a radial direction 24 perpendicular to the axial direction, the material recesses 14 to 20 are designed such that they pass completely through the housing section 12 , The material recesses 14 to 20 are filled with complementary shaped portions 26 of the decoupling element 10.
- the material recesses 14 to 20 are aligned in the radial direction 24 with an edge portion 28 of the membrane 6, wherein this edge portion reinforces the membrane 6 in the radial direction.
- Adjacent material recesses for example the material recesses 16 and 18, are separated from one another by a web-shaped material section 30 formed in the annular housing section 12.
- the material recesses 14 to 20 are delimited by an edge section 32 whose height 34 in the axial direction 22 corresponds to a material thickness 36 in the radial direction 24.
- the web-shaped material sections 30 have a higher material thickness 38 in the radial direction than the material thickness 36 of the edge section 32.
- the material recesses 14 to 20 cause the membrane 6 on the one hand and the housing portion 12 and thus the Housing 4 on the other hand vibration technology can be decoupled from each other.
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE200610028212 DE102006028212A1 (de) | 2006-06-14 | 2006-06-14 | Ultraschallsensor |
| PCT/EP2007/004124 WO2007144047A1 (de) | 2006-06-14 | 2007-05-10 | Ultraschallsensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP2027579A1 true EP2027579A1 (de) | 2009-02-25 |
Family
ID=38328209
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP07725046A Withdrawn EP2027579A1 (de) | 2006-06-14 | 2007-05-10 | Ultraschallsensor |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP2027579A1 (de) |
| DE (1) | DE102006028212A1 (de) |
| WO (1) | WO2007144047A1 (de) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102009046972A1 (de) | 2009-11-23 | 2011-05-26 | Robert Bosch Gmbh | Ultraschallsensor |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2223531B1 (de) * | 1972-05-15 | 1973-11-08 | Siemens Ag | Elektroakustischer wandler |
| EP0251797B1 (de) * | 1986-07-02 | 1993-10-06 | Nec Corporation | Ungerichteter Ultraschallwandler |
| DE3702378A1 (de) * | 1987-01-27 | 1988-08-04 | Siemens Ag | Piezoelektrischer wandler fuer schwerhoerige |
| US4918672A (en) * | 1988-08-11 | 1990-04-17 | Niles Parts Co., Ltd. | Ultrasonic distance sensor |
| DE19744229A1 (de) * | 1997-10-07 | 1999-04-29 | Bosch Gmbh Robert | Ultraschallwandler |
| DE19752921A1 (de) * | 1997-11-28 | 1999-06-02 | Bosch Gmbh Robert | Ultraschallsensor |
| DE19756462B4 (de) * | 1997-12-18 | 2007-03-08 | Robert Bosch Gmbh | Ultraschallwandler |
| DE19937195B4 (de) * | 1999-08-06 | 2006-03-09 | Valeo Schalter Und Sensoren Gmbh | Ultraschallwandler |
| DE10125272A1 (de) * | 2001-05-23 | 2002-11-28 | Valeo Schalter & Sensoren Gmbh | Verfahren zur Herstellung eines Ultraschallsensors sowie Ultraschallsensor |
-
2006
- 2006-06-14 DE DE200610028212 patent/DE102006028212A1/de not_active Withdrawn
-
2007
- 2007-05-10 WO PCT/EP2007/004124 patent/WO2007144047A1/de not_active Ceased
- 2007-05-10 EP EP07725046A patent/EP2027579A1/de not_active Withdrawn
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2007144047A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102006028212A1 (de) | 2007-12-20 |
| WO2007144047A1 (de) | 2007-12-21 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| 17P | Request for examination filed |
Effective date: 20081113 |
|
| AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR |
|
| AX | Request for extension of the european patent |
Extension state: AL BA HR MK RS |
|
| RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: JUNG, THOMAS Inventor name: GRUEDL, DIETMAR Inventor name: PETZOLD, MANUEL Inventor name: KUPERNAGEL, UWE Inventor name: WEHLING, HANS-WILHELM |
|
| RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: JUNG, THOMAS Inventor name: GRUEDL, DIETMAR Inventor name: PETZOLD, MANUEL Inventor name: KUPERNAGEL, UWE Inventor name: WEHLING, HANS-WILHELM |
|
| 17Q | First examination report despatched |
Effective date: 20090407 |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
| 18D | Application deemed to be withdrawn |
Effective date: 20090818 |