Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
  • H01G5/00—Capacitors in which the capacitance is varied by mechanical means, e.g. by turning a shaft; Processes of their manufacture
  • H01G5/01—Details
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
  • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
  • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
  • G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
  • G01D5/24—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying capacitance
  • G01D5/241—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying capacitance by relative movement of capacitor electrodes
  • G01D5/2412—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying capacitance by relative movement of capacitor electrodes by varying overlap
  • G01D5/2415—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying capacitance by relative movement of capacitor electrodes by varying overlap adapted for encoders
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T29/00—Metal working
  • Y10T29/43—Electric condenser making
  • Y10T29/435—Solid dielectric type

Definitions

• the present invention relates to a capacitor element with an electrode surface pattern for capacitive sensors according to the preamble of claim 1.
• each electrode surface is included at least one contact point.
• these are bores or holes through the electrode surface and the substrate carrying the substrate, through which the electrode surfaces are contacted from the back of the capacitor element. The size and position of these bores or holes not only influence the capacitance of each electrode area, provided that they are in the active capacitor area, but also significantly determine the smallest possible dimensions of the electrode areas.
• the present invention is therefore based on the object of creating a capacitor element with an electrode surface pattern for capacitive transducers which eliminates these disadvantages and makes it possible to arrange a plurality of electrode surfaces on such elements with comparable dimensions. This must not be at the expense of the clearly determinable capacitance of the capacitor in any position of the sensor.
• this object is achieved by a capacitor element with an electrode surface pattern, as defined in claim 1.
• An advantageous embodiment variant of a capacitor element according to the invention is described below with reference to the drawing. In the latter shows
• FIG. 4 shows an advantageous embodiment variant of a capacitor element according to the invention with an electrode surface pattern with circular segment-shaped electrode surfaces with a central bore and centrally arranged connections, on an enlarged scale in plan view, and
• FIG. 1 to 3 illustrate a capacitor element with an electrode surface pattern according to the prior art.
• FIG. 1 shows that due to the inner contact holes 2 arranged on the circular segment tips of the electrode surfaces 1, which, as illustrated in FIG. 3, both through the substrate 3 and through the copper layers of the electrode surfaces applied thereon 1 on the front of the capacitor element and the conductor tracks 4 on the back of the same (FIG. 2), it is not possible to make the circular segment electrode surfaces 1 as narrow as desired. As a result, however, it is also not possible to arrange much more than the sixteen circular segment electrode surfaces 1 shown here in such a capacitor element with an outer diameter of approximately 20 mm. How 2 shows, these are connected on the back of the capacitor element both to one another and to connections 5 by means of the conductor tracks 4.
• a substrate disc 13 drilled before coating with the electrode surfaces and conductor tracks is used, onto which the electrode surfaces 11 are laminated on one side or by others Means are applied in such a way that the conductive layer, which is, for example, a metal layer, completely covers the contacting holes or channels.
• the conductor tracks 14 to be arranged on the rear side of the substrate wafer 13 are then advantageously metallized, the metallization layer likewise being located in the contacting holes or channels 12 of the substrate wafer 13 and on the conductive layer covering it against the front side, or. the back of the electrode surfaces 11 visible there forms, whereby these are contacted.
• the capacitor element according to the invention with an electrode surface pattern can also be implemented for linear capacitive sensors.
• a is advantageously used Electrode surface patterns with rectangular electrode surfaces are used, which are arranged as parallel strips transversely to the measuring direction, whereas the conductor tracks run independently of this.
• the contacting holes or channels or locations no longer have to be outside the active electrode surfaces in the case of such a construction of a capacitor element with an electrode surface pattern, since they are not shown here for this ⁇ not to see complementary capacitor element of the capacitor. Since the electrode surfaces remain completely undamaged due to the type of contact described, the contact holes or channels or locations in the capacitor element according to the invention also have no influence on the capacitance of the capacitor and are no longer detected electrically. In the case of a round capacitor element with electrode segments in the form of a segment of a circle, this also makes it possible to lay the inner contact holes or channels 12 against the outer edge of the capacitor element as far as is necessary so that they are completely covered even with very narrow segment electrode surfaces 11.
• the capacitor elements according to the invention can be provided with an electrode surface pattern which has a multiple of electrode surfaces than comparable conventional capacitor elements of this type, it is possible for the first time, even with small-sized capacitive sensors, to be a multiple achieve greater measurement accuracy and resolution than before. Due to the fact that the entire existing electrode surfaces can be used as active electrode surfaces, since they no longer have any disturbing contact holes or channels, it is even possible to dimension the transducer with a predetermined resolution smaller than before. this applies naturally also for capacitor elements according to the invention for linear sensors.
• the invention also makes it possible to move the connections which are arranged on the periphery of the capacitor elements with circular segment-shaped electrode surfaces and are often disturbing there, in the central region of the capacitor element, since the circular segment electrode surfaces are active electrode surfaces up to their outermost edge can be used, which has the advantage that their most effective areas can be used for capacitance measurement. As a result, the use of the relatively ineffective tips of the circular segment electrode surfaces can be dispensed with without losses.
• the connections can be arranged in their place, advantageously contactable from the rear of the pane.
• the capacitor elements with electrode surface patterns can thus be circularly limited both in their center and at their periphery, without having to be made larger as a result.
• An angle encoder which is manufactured with a capacitor element according to the invention, can thus be smaller than a conventional angle encoder with a significantly increased measurement accuracy and resolution.

Landscapes

• Engineering & Computer Science (AREA)
• Power Engineering (AREA)
• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Microelectronics & Electronic Packaging (AREA)
• Transmission And Conversion Of Sensor Element Output (AREA)
• Measurement Of Resistance Or Impedance (AREA)
• Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=4234013

Family Applications (1)

Country Status (5)

Families Citing this family (4)

Family Cites Families (5)

• 1987
  • 1987-06-29 CH CH2446/87A patent/CH673172A5/de not_active IP Right Cessation
• 1988
  • 1988-06-23 WO PCT/CH1988/000113 patent/WO1989000277A1/de not_active Application Discontinuation
  • 1988-06-23 EP EP88905175A patent/EP0322428A1/de not_active Withdrawn
  • 1988-06-23 US US07/350,558 patent/US4937694A/en not_active Expired - Fee Related
  • 1988-06-23 JP JP63504853A patent/JPH02500614A/ja active Pending

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events