Measuring and testing – Speed – velocity – or acceleration – Angular rate using gyroscopic or coriolis effect
Patent
1996-06-03
1998-06-16
Chapman, John E.
Measuring and testing
Speed, velocity, or acceleration
Angular rate using gyroscopic or coriolis effect
73493, G01P 904
Patent
active
057674043
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a rotation rate sensor in accordance with the species of the main claim. A measuring element for detecting the movement of a vehicle and an electrical circuit arranged on a printed circuit board are provided in a housing of rotation rate sensors in actual use up to now. The electrical components of the circuit are connected with the measuring element by means of wires. Due to the components used, the rotation rate sensor is relatively large and voluminous. Because of this it is difficult to install in motor vehicles, for example.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide a rotation rate sensor which avoids the disadvantages of the prior art.
In keeping with these objects and with others which will become apparent hereinafter, one feature of the present invention resides, briefly stated in a rotation rate sensor, in which the measuring element is connected with the circuit by a flexible printed circuit board having a bending region, and a cutout is provided in the bending region.
When the rotation rate sensor is designed in accordance with the present invention, it has the advantage of allowing a very flat construction. The components are furthermore disposed in a very compact and space-saving manner in the housing of the rotation rate sensor. The electrical elements can be simply and compactly connected by means of the flexible printed circuit board, which is the connection between the hybrid circuit and the measuring element. Only a single element, the flexible printed circuit board, is required for this, in contrast to the several different wires up to now. The cutout in the flexible printed circuit board allows easy bending and thus elasticity without the printed circuit board being destroyed in the process. Furthermore, improved oscillation decoupling between the measuring element and the hybrid circuit is achieved by means of this. The oscillations to be detected by the measuring element are only transmitted to a very small degree to the hybrid circuit via the flexible printed circuit board. The very compact arrangement of a temperature sensor directly at the end of the flexible printed circuit board permits a simple and exact calibration possibility by means of deviations caused by temperature fluctuations. Thus the temperature fluctuations caused by the heat loss of the components of the hybrid circuit can be compensated in good time. The use of the flexible printed circuit board also simultaneously permits the shielding of the circuits arranged thereon by means of a shielding grate (ground shield). Because of the use of the flexible printed circuit board, it is also possible to arrange a ground strip between the respective signal-carrying strip conductors, so that the signal-carrying strip conductor are shielded from each other. The tongue formed at the plug permits the coded installation and can simultaneously be used for applying manufacturing data. The novel features which are considered as characteristic for the present invention are set forth in particular in the appended claims. The invention itself, however, both as to its construction and its method of operation, together with additional objects and advantages thereof, will be best understood from the following description of specific embodiments when read in connection with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows a longitudinal section through a rotation rate sensor, FIG. 2 a view into the interior of the rotation rate sensor with the cover open, and FIG. 3 a perspective view of the assembled rotation rate sensor.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The housing of a rotation rate sensor, consisting of an upper element 11 and a cover 12, is indicated by 10 in FIG. 1. The cover 12 has a circumferential edge 13, which is inserted into a circumferential groove 14 in the upper element 11 and is fastened therein by casting with the aid of a casting compound 15. During assembly, air can escape from
REFERENCES:
patent: 4620442 (1986-11-01), MacGugan et al.
patent: 4655081 (1987-04-01), Burdess
patent: 5233871 (1993-08-01), Schwarz et al.
patent: 5548999 (1996-08-01), Kakizaki et al.
patent: 5581032 (1996-12-01), Uemura et al.
Kaiser Harry
Willig Rainer
Chapman John E.
Robert & Bosch GmbH
Striker Michael J.
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