JPH06139489A - Transmitter - Google Patents

Abstract

PURPOSE:To detect the use quantity of electric power, etc., with high accuracy by a simple circuit configuration by providing a reflecting part in addition to a measuring scale, photodetecting a reflected light from this reflecting part by a photodetecting means, and converting it to an electric signal by a converting means. CONSTITUTION:A digit wheel 1 is operated by a rotation of a disk being proportional to electric energy. A reflection type photosensor 2 is arranged on the lower face opposed to the outside peripheral surface of the digit wheel 1, and outputs infrared rays 3. A reflecting part 5 is provided on the left side of the outside peripheral surface. In such a state, in the reflection type photosensor 2, in the case the infrared ray 3 of the photosensor 2 opposed to the reflecting part 5 hit against a black part of the reflecting part 5, they are not reflected, therefore, a phototransistor in the photosensor 2 does not operate, and on the other hand, when the opposed surface is a white ground, the infrared ray 3 are reflected and the phototransistor operates. By repeating it, it can be detected as a pulse being proportional to a rotation. Accordingly, the phototransistor photodetects an optical signal, and it is converted to an electric signal by a converting means, therefore, the use quantity of electric power, etc., can be measured by a simple circuit configuration.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmitter which outputs a pulse according to the amount of electric power used.

[0002]

2. Description of the Related Art With the increase in apartments and buildings, an automatic meter reading system has been adopted to improve the efficiency of meter reading work and reduce the meter reading cost by visiting meter reading. As a terminal of this automatic meter reading system, for example, a watt hour meter with a transmitter is used. The transmitter of the watt hour meter outputs a pulse proportional to the amount of electric power.

A method of detecting a pulse proportional to the amount of electric power will be described with reference to FIG. As with a normal electricity meter without a transmitter, rotation of the disk 21 proportional to the amount of electricity causes the number wheel 1 of the weighing device 22 to rotate via a mechanical subtraction mechanism such as the worm 23 and gear 24. , Display the electric energy. A magnet 25 is incorporated in the lowest numeral wheel 1, and a magnetoresistive element 26 is attached near the magnet 25. Magnet 25 with rotation of the lowest digit wheel 1
When is rotated, the resistance value of the magnetoresistive element 26 changes due to the change in the magnetic field, and this level change is extracted as a digital signal by the comparator. Pulses of contact relay output and open collector output are output by this digital signal.

The magnet 2 incorporated in the numeral wheel 1
No. 5 is magnetized with 10 poles or 1 pole. In case of 10 pole magnetization, 10 pulses per rotation of the lowest digit wheel,
In the case of one-pole magnetization, the magnetic field is changed to output one pulse per one rotation of the lowest digit wheel.

[0005]

However, in such a transmitter, the number of magnetized magnetic poles of the magnet 25 must be increased in order to increase the pulse frequency in order to detect the electric power finely, but the lowest number. Since the magnet 25 incorporated in the vehicle 1 is small, the number of magnetized poles is limited. Therefore, it is conceivable to detect the rotation of the disk 21 of the watt-hour meter and divide the detection signal so as to meet each rating to obtain a high pulse, but since the pulse is divided so as to meet each rating. In addition, a circuit for frequency division and a circuit for setting the frequency division ratio are required, which causes a high cost in terms of complexity of the circuit configuration. An object of the present invention is to provide a low-cost transmitting device that can detect the usage amount of electric power or the like with high accuracy without requiring a magnet or a frequency dividing circuit.

[0006]

In order to achieve the above object, the present invention detects the rotation of a disk that rotates in proportion to the usage amount of electric power, gas, water, etc., and converts it into an electric signal. In a transmitting device that outputs a pulse proportional to the usage amount of, the measuring means for detecting the rotation of the disk and displaying the measured value, the light emitting means for emitting light to the measuring means, and the measuring scale are separately provided for the measuring means. It is provided with a reflecting portion which is provided and has a different reflectance and reflects an optical signal from the light emitting means, a light receiving means for receiving the reflected light from the reflecting portion, and a light receiving means and a converting means for converting a detected value into an electric signal. The point is to do.

[0007]

In such a structure, the reflecting portion provided separately from the measuring scale on the measuring means for detecting the amount of electric power used reflects the optical signal from the light emitting means, and the light receiving means receives the optical signal. Since it is converted into an electric signal by the conversion means,
It is possible to measure the amount of electric power used with a simple circuit configuration.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an enlarged view of a main part of a transmitting device according to the present invention. In the figure, reference numeral 1 is a numeral wheel, which is operated by rotation of a disk proportional to the amount of electric power. The number digit 1 which is the lowest digit displays the electric energy of 10kWh when it makes one revolution and 1kWh
There is one that displays the amount of electricity. Reference numeral 2 is a reflection type photo sensor, which is arranged on the lower surface facing the outer peripheral surface of the numeral wheel 1 to output infrared light 3, and 4 is a graduation scale. Reference numeral 5 denotes a reflecting portion, which is provided, for example, on the left side of the outer peripheral surface of the numeral wheel 1.

When the lowest numbered wheel is displayed at 10 kWh per revolution, the reflector 5 has a ground color of black and the mark 1 and the number scale are white, or the lowest numbered wheel is 1 per revolution.
When displaying kWh, the ground color is white and the mark and number scale are black. In the reflection-type photo sensor 2, the infrared light 3 of the photo sensor 2 faces the reflection part 5 and
When it hits the black part (when displaying 10kWh per rotation), the phototransistor does not operate because it is not reflected, and when the facing surface is white of the ground, infrared light 3 is reflected and the phototransistor operates. . By repeating this, the pulse can be detected as a pulse proportional to the rotation.
Next, the operation will be described.

In the watt hour meter for rotating the disk, which is proportional to the amount of electric power, through the subtraction mechanism such as a worm or a gear to rotate the numeral wheel 1 of the weighing device to display the amount of electric power, the lowest number of the weighing device is displayed. A reflector 5 is provided on the outer peripheral portion of the vehicle 1.

In order to detect a signal of 10 pulses per one rotation of the numeral wheel, the photo sensor 2 is arranged so as to face the ten marks 1 provided on the outer periphery of the numeral wheel. Similarly, in order to detect a signal of one pulse per one rotation of the numeral wheel, the photo sensor 2 is arranged so as to face the numeral wheel having one mark.

In the photo sensor 2, the infrared light 3 emitted from the photodiode in the photo sensor 2 hits the reflecting surface, and the mark 1 on the outer peripheral surface of the numeral wheel 1 which is the reflecting surface and the ground color are white and black. Therefore, the infrared light 3 may or may not be reflected depending on the difference in reflectance of the color.
The phototransistor in the photosensor 2 is turned on / off depending on the presence or absence of this reflection.

In order to convert the on / off signal of the transistor into a digital signal, a comparator or the like (not shown) is connected to the next stage, and the signal is used to output a pulse such as an open collector output or a contact output. ing.

FIG. 2 shows a front view of the transmitter of the present invention. In this way, the reflecting portion 5 provided to the numeral wheel 1 is in the shadow of the measuring window 20 of the nameplate 21, so that the pulse non-transmission due to fading / discoloring due to light, dirt, etc. as in the conventional case,
Pulse instability can be prevented and reliability is improved. On the other hand, if 100 reflection parts 5 are provided on the outer peripheral surface of the numeral wheel, the specification of 100 pulses per one rotation of the lowest numeral wheel can be supported, which is useful for fine power management. Further, another embodiment is shown in FIG.

In the case of performing rough power amount management as opposed to fine power amount management, or in the case of a large customer, for example, when one pulse is required for every 10 rotations of the lowest numbered wheel, the second numbered wheel 40 is used. Since it is the same as one pulse per one rotation, the reflecting portion 5 is provided at one place on the outer peripheral surface of the second numeral wheel 40, and the photosensor 2 is arranged so as to face the reflecting portion 5.

When the lowest numeral wheel 1 is rotated ten times by the rotation of the disk in proportion to the electric power, the second numeral wheel 4 is
0 rotates once, and the photosensor 2 facing it operates once to output a pulse.

In the same manner as in the above-described embodiment, the low pulse specification of 1 pulse per 10 rotations of the numeral wheel as well as the high pulse specification (100 pulses per 1 rotation of the numeral wheel) can be supported at low cost. Further, by changing the number of the reflection parts 5 in various ways, it is possible to meet specifications other than the power pulse of 10 (such as 50 pulses per one rotation of a numeral wheel).

[0019]

As described above, according to the present invention, the measuring means for detecting the rotation of the disk which rotates in proportion to the amount of electric power used is provided with the reflecting portion in addition to the measuring scale. Since the reflected light from the section is received by the light receiving means and converted into an electric signal by the converting means, it is possible to detect the usage amount of electric power and the like with high accuracy with a simple circuit configuration, and to obtain a lower cost transmitter. it can.

[Brief description of drawings]

FIG. 1 is an enlarged view of a main part of a transmission device of the present invention.

FIG. 2 is an enlarged view of a main part from the front of the transmitter of the present invention.

FIG. 3 is an enlarged view of an essential part showing another embodiment of the transmitting device of the invention.

FIG. 4 is an enlarged view of a main part of a conventional transmitting device.

[Explanation of symbols]

 1 ... Numerical wheel, 2 ... Photo sensor, 5 ... Reflector

Claims (1)

[Claims] 1. A transmitting device which detects rotation of a disk which rotates in proportion to the usage amount of electric power, gas, water, etc., converts it into an electric signal and outputs a pulse proportional to these usage amounts, Measuring means for detecting the rotation of the disc and displaying the measured value, light emitting means for outputting an optical signal to the measuring means, and measuring scale for the measuring means are provided separately, and the reflectance is different and A transmitting device comprising: a reflecting section for reflecting an optical signal from the light emitting section; a light receiving section for inputting the optical signal from the reflecting section; and a converting section for converting a detection value of the light receiving section into an electric signal.