Electricity: measuring and testing – Magnetic – Displacement
Reexamination Certificate
2003-12-18
2004-11-16
LeDynh, Bot (Department: 2862)
Electricity: measuring and testing
Magnetic
Displacement
Reexamination Certificate
active
06819102
ABSTRACT:
CROSS REFERENCE TO RELATED APPLICATION
This application is based on and incorporates herein by reference Japanese Patent Application Nos. Hei. 11-311126 filed on Nov. 1, 1999, 2000-22529 filed on Jan. 31, 2000, and 2000-147238 filed on May 19, 2000.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a rotation angle detector suitable for use in a throttle position sensor of a vehicle.
2. Description of Related Art
JP-A-62-182449 discloses a throttle position sensor in which an insulating plate having a variable resister is fixed to the end of a throttle valve shaft. The insulating plate rotates with the throttle valve shaft. A throttle position signal is output from a terminal fixed at a sensor cover side of the throttle position sensor.
However, in JP-A-62-182449, since the terminal is mechanically fixed to the throttle position sensor, the terminal is not appropriately positioned with respect to the insulating plate, thereby reducing a detecting accuracy of the throttle valve opening degree.
JP-A-2-130403 discloses a throttle position sensor in which a permanent magnet and a yoke are fixed to a throttle valve shaft. The permanent magnet and the yoke rotate with the throttle valve shaft. A Hall element detecting a rotation angle of the throttle valve and a signal calculate circuit are disposed on a board, and are connected to a connector through a lead frame. A throttle position signal is output through the connector.
However, in JP-A-2-130403, the board, the lead frame, and the connector are integrated by resin, and this integrated member is mechanically screwed to a throttle body, so that the throttle valve shaft may slide in the axial direction thereof.
SUMMARY OF THE INVENTION
A first object of the present invention is to accurately position a magnetic sensing element with respect to a magnet for improving an accuracy of detecting a rotation angle. A second object of the present invention is to easily connect the magnetic sensing element and an outside connection terminal.
According to a first aspect of the present invention, a resin molded member integrates and supports a non-contact type magnetic sensing element and an output terminal by resin molding. Thus, the magnetic sensing element and the output terminal are accurately positioned. As a result, when a resin molded member supporting a sensor unit including the magnetic sensing element is attached to a rotary member, a gap between the magnetic sensing element and a magnet disposed in the rotary member is accurately attained, thereby improving an accuracy of detecting a rotation angle of the rotary member.
According to a second aspect of the present invention, a first resin molded member integrating and supporting a non-contact type magnetic sensing element and an output terminal by resin molding and a stator core strengthening a magnetic force around the non-contact type magnetic sensing element are integrated and supported by resin molding. Thus, the magnetic sensing element and the output terminal are accurately positioned, thereby improving an accuracy of detecting a rotation angle of a rotary member.
According to a third aspect of the present invention, a condenser is disposed between an outside connection terminal and a ground terminal and connected thereto. Thus, a stable output signal is effectively attained from an electric device, and a stable input signal is effectively supplied into the electric device. Further, since the condenser is supported by a resin molded member of which forming pressure is lower than a general injection pressure, the condenser is not highly pressed, thereby preventing the condenser from separating from the outside connection terminal and the ground terminal.
According to a fourth aspect of the present invention, a stator core includes a first stator core portion made by stacking a plurality of magnetic plates in a thickness direction thereof, a second stator core portion made by stacking a plurality of magnetic plates in a thickness direction thereof, and a non-magnetic plate connecting an end surface of the first stator core portion to an end surface of the second stator core portion. Thus, the width of a magnetic sensing gap formed between the first and second stator core portions are accurately kept without a resin spacer, thereby improving en efficiency of a magnetic circuit. Therefore, the stator core is made by one component combining the magnetic plate and non-magnetic plate, thereby reducing the number of parts and production cost.
REFERENCES:
patent: 4737710 (1988-04-01), Van Antwerp
patent: 5012673 (1991-05-01), Takano
patent: 5121289 (1992-06-01), Gagliardi
patent: 5444369 (1995-08-01), Luetzow
patent: 5497081 (1996-03-01), Wolf
patent: 5609184 (1997-03-01), Apel et al.
patent: 5672818 (1997-09-01), Schaefer et al.
patent: 5698778 (1997-12-01), Ban
patent: 5757179 (1998-05-01), McCurley
patent: 5789917 (1998-08-01), Oudet
patent: 6194894 (2001-02-01), Apel
patent: 6279535 (2001-08-01), Matsusaka
patent: 6407543 (2002-06-01), Hagio
patent: 6448762 (2002-09-01), Kono
patent: 6498479 (2002-12-01), Hamaoka
patent: 296 06 042 (1996-06-01), None
patent: 196 40 255 (1998-04-01), None
patent: 19652988 (1998-07-01), None
patent: 62-182449 (1987-08-01), None
patent: 2-130403 (1990-05-01), None
patent: 8-35809 (1996-02-01), None
patent: 8-68606 (1996-03-01), None
Patent Abstract of Japan; vol. 1995; No. 6; Jun., 1992 of JP 07 066356, Mar. 10, 1995.
Patent Abstract of Japan; vol. 014; No. 358; Aug. 1990 of JP 02 130403, May 1990.
Hagio Hirofumi
Hamaoka Takashi
Kondo Tomokazu
Kono Yoshiyuki
Kubota Takamitsu
LandOfFree
Rotation angle detector having sensor cover integrating... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Rotation angle detector having sensor cover integrating..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Rotation angle detector having sensor cover integrating... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3306034