JPS60195457A - Capacitor type rotary electrostatic voltmeter - Google Patents

Abstract

PURPOSE:To execute a remote indication by drawing plural black lines on a photodetecting plate provided on a movable electrode plate shaft, detecting the rotating direction and the rotating quantity of the photodetecting plate by an output electric signal of a reflection type photosensor for reading a difference of a reflection factor, and indicating the position of an electrode plate. CONSTITUTION:A capacitor is constituted of a fixed electrode plate 1 and a movable electrode plate 2, and an effective area of the capacitor is varied by rotating a shaft 3 to which the electrode plate 2 is fixed. Also, to the shaft 3, a spiral spring 4 fixed to a fixed arm 5 is fixed, and also a photodetecting plate 6 is installed. Moreover, a black line 7 is frawn at an equal interval of the photodetecting plate 6, on which reflection type optical fiber system photosensors 8, 9 are provided. In this state, when an optical beam diameter, the width of the black line, and the distance between the black lines are denoted as (d), (a) and (b), respectively, an interval of the sensors 8, 9 becomes (a)+(b)+(d), and switches of two pieces each operated by the sensors 8, 9 sometimes become off simultaneously without fail, and from the switch which has been turned on first, the rotating direction and a rotating quantity of the plate can be known, and accordingly, an electrostatic voltage can be known.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a capacitor-type rotary electrostatic voltmeter convenient for remote indication and recording.3 This invention will be explained in detail with reference to the drawings with reference to embodiments.

FIG. 1 is a plan view showing an embodiment of the present invention, in which a fixed electrode plate 1 and a movable electrode plate 2 constitute a capacitor, and the movable electrode plate 2 is fixed to a shaft 3 and has a fixed angular range. It is now possible to rotate, and by that rotation,
The effective area as a capacitor changes. One end of a spiral spring 4 is fixed to the shaft 3, and the other end is attached to a fixed arm 5. Further, a light receiving plate 6 is attached to the shaft 3, and black lines 7 are drawn on the light receiving plate 6 at equal intervals in a radial direction centered on the center of the shaft 3. Two reflective optical fiber set photosensors 8 and 9 are provided above the black line 7 at a constant interval.

FIG. 2 is a drawing showing the relationship between the width of the black lines, the distance between the black lines, and the positions of the tips of two reflective optical fiber photosensors.

Assume that two reflective optical fiber set photosensors are placed on the same circumference centered on the center of the rotation axis, and the width of the black line is a, and the distance between adjacent black lines on the circumference is b. If the diameter of the light beam is d, then the width is b)(1,5~2)d, and the distance between the tips of the optical fiber photosensors is n(a+b)+(o,5~1). .0) Take it to d. Tasoshi n is an arbitrary integer.

In FIG. 2, n21 is used, and the distance between the optical fiber set photosensors is a+d.

Now, if we assume that the switch is turned on when the tip of the reflective optical fiber set photo sensor is on the black line, and the switch is turned off when it is not on the black line, then if we arrange it as above, each of the two There is a time when each of the two switches operated by the reflective fiber optic set photosensor is always turned off at the same time, and from that point on, depending on the direction of rotation of the receiver plate, one of the two switches is always turned off. one switch turns on before the other switch. Utilizing this fact, the direction and amount of rotation of the light-receiving plate can be determined, thereby allowing the position of the movable electrode plate to be indicated and the electrostatic voltage to be determined.

[Brief explanation of drawings]

FIG. 1 is a plan view showing an embodiment of the present invention, and FIG.
The figure shows the relationship between the width of the black lines, the distance between the black lines, and the positions of the tips of two reflective optical fiber photosensors. 1... Fixed electrode plate 2... Movable electrode plate 3... Shaft 4... Spiral spring 5...
... Fixed arm 6 ... Light receiving plate 7 ... Black line 8, 9 ... Reflective optical fiber set photosensor

Claims (1)

[Claims] In a capacitor-type rotary electrostatic voltmeter, a light receiving plate is provided on the shaft to which the movable electrode plate is attached, and a plurality of black lines are drawn on the light receiving plate, and the black line is connected to the part where the black line is not drawn. By creating a difference in the reflectance of light, the difference in reflectance is read by a reflective photosensor and converted into an electrical signal.The direction and amount of rotation of the light receiving plate is detected by the electrical signal, and the movable electrode plate is Capacitor-type rotating electrostatic voltmeter that indicates position