CONTACTLESS ELECTRON JOYSTICK OF UNIVERSAL JOINT STRUCTURE USING SINGLE HALL SENSOR

• US 20070242043A1
• Filed: 06/21/2006
• Published: 10/18/2007
• Est. Priority Date: 04/17/2006
• Status: Abandoned Application

• Current Assignee: Dong-A University
• Original Assignee: Dong-A University
• Inventors: YANG, Jae Woo, LEE, Hyo Moon, LEE, Jang Myung, CHOI, Joon Young, JIN, Hong Zhe
• Application Number:
  US11/425,659
• Publication Number:
  US 20070242043A1
• Time in Patent Office: Days
• US Class Current: 345/161
• CPC Class Codes: G05G 2009/04707 with ball joint
• CPC Class Codes: G05G 2009/04755 Magnetic sensor, e.g. hall generator, pick-up coil
• CPC Class Codes: G05G 9/047 the controlling member being movable by hand about orthogonal axes, e.g. joysticks for switches H01H25/04

Abstract

A contactless joystick of a universal joint structure using a single hall sensor is disclosed, in which a two-dimension coordinate of an end of a joystick bar is obtained based on a principle that a rotation of a horizontal vector of a magnetic field is detected using a hall sensor, and a human body engineering design can be obtained with a universal joint structure, and it is easy to diagnose a certain failure with its simple structure, and a simple assembly is obtained, and work efficiency can be maximized, and an enhanced vibration resistance structure is obtained.

Claims

1. A contactless electron joystick of a universal joint structure using a single hall sensor characterized in that a bar shaped permanent magnet engaged at a lower side of a joystick bar helps forming a horizontal vector with respect to a magnetic flux of an axial direction of a bar magnet on a two-dimension plane of a hall sensor in sync with an operation of a universal joint, and the hall sensor detects a formation of the horizontal vector for thereby controlling a direction and speed of a control object.

2. The joystick of claim 1, wherein said contactless electron joystick includes:

an x-axis input buffer which has a first buffer for receiving a signal having a phase difference of 90°

corresponding to an x-axis component of a direction of a magnetic field and a second buffer for receiving an inner reference voltage of the hall sensor of an x-direction;

a y-axis input buffer which has a third buffer for receiving a signal having a phase difference of 90°

corresponding to a y-axis component of a direction of a magnetic field and a fourth buffer for receiving an inner reference voltage of the hall sensor of a y-direction;

a reference voltage buffer which has fifth and sixth buffers for generating reference voltages of x-direction and y-direction of an inner side of a controller circuit;

a low pass filter which has a seventh buffer for receiving an output signal of the first buffer through its one side and the output signals of the second buffer and fifth buffer from its other side, and an eighth buffer for receiving an output signal of the third buffer and the output signals of the fourth buffer and sixth buffer through its other side, for thereby performing a differential amplification and low pass filtering with respect to a difference between an inner reference voltage of the controller circuit and a reference voltage of the hall sensor; and

a signal converter circuit provided for an output of the hall sensor, said signal converter circuit including an output buffer which has a ninth buffer and a tenth buffer for buffering the output signals of the seventh buffer and the eighth buffer and for outputting the same.

3. The joystick of claim 1, wherein in a nonlinear characteristic between an output signal of the hall sensor and a motion of the joystick bar,

4. The joystick of claim 3, wherein in said formula 5, said maximum linear range θ

_c has the following formula,

5. The joystick of claim 4, wherein a constant value ξ

, which is in constant proportion to an amplification coefficient of the signal converter circuit, has the following formula,

6. The joystick of claim 5, wherein in a nonlinear compensation with respect to an output of the sensor and an inclination of the joystick bar, the following formula 12,