초록 ▼

A Hall-effect control apparatus incorporating an actuator member having a magnetic core, and which is pivotally mounted on a base for movement in X-axis and Y-axis directions. An electrically energized coil excited with a. c. voltage produces a fluctuating magnetic field in the vicinity of the core.

A Hall-effect control apparatus incorporating an actuator member having a magnetic core, and which is pivotally mounted on a base for movement in X-axis and Y-axis directions. An electrically energized coil excited with a. c. voltage produces a fluctuating magnetic field in the vicinity of the core. Four Hall-effect sensors are mounted on the base, and are arranged to sense changes in the a. c. field as the core member moves. The output of the Hall-effect sensors is both d. c. and a. c.; an electrical circuit connected therewith processes these voltages so as to cancel out any d. c. components thereof. The output of the electrical circuit in turn provides two voltages which are indicative of the X-axis and the Y-axis positions of the actuator member. The device is immune to interruption arising from d. c. fields, such as that of the earth; also significant immunity against error due to temperature fluctuations is realizeable, as is immunity to error arising from aging of the various components. There is thus achieved improved accuracy and linearity as compared to the various devices of the prior art.

대표청구항 ▼

A joystick control, comprising in combination: (a) a base, (b) a movable actuator member, (c) means pivotally mounting the actuator member for tilting movement on the base, (d) means providing a fluctuating electric field on the base, (e) said actuator member carrying a magnetic core movable with re

A joystick control, comprising in combination: (a) a base, (b) a movable actuator member, (c) means pivotally mounting the actuator member for tilting movement on the base, (d) means providing a fluctuating electric field on the base, (e) said actuator member carrying a magnetic core movable with respect to said fluctuating electric field providing means, thereby to alter the said fluctuating electric field as the actuator member is moved, (f) a Hall-effect sensor rigid with respect to the base and disposed so as to be under the influence of said fluctuating electric field, (g) said Hall-effect sensor providing a fluctuating electrical output signal in response to fluctuations of said fluctuating electric field, and (h) electronic circuit means connected to said Hall-effect sensor, for converting the fluctuating output signal thereof to essentially a d.c. voltage which varies with changes in the position of the magnetic core carried by said actuator member.