JPH04364469A - Transmitting device - Google Patents

Abstract

PURPOSE:To detect the measured amount finely and to make it possible to decrease the cost by providing a light emitting means and a light receiving means in a measuring means wherein a measured-value display part having the different reflectivities is provided, and providing a converting means for converting the detected value of the received light into the electric signal. CONSTITUTION:A reflecting type photosensor 2 is arranged at the lower surface facing the outer surface of a number wheel l. When infrared rays 7 emitted from the sensor 2 is tentatively made to hit the white part of a graduation 3 which is divided into 100 equal parts of the number wheel 1, the reflected light is detected with a phototransistor in the sensor 2 and converted into the digital signal in a comparator circuit at the next output stage, and the signal is outputted. Conversely, when the infrared rays 7 emitted from the reflecting type photosensor 2 tentatively hits the black part of the graduation 3 which is equally divided into 100 parts of the number wheel 1, the infrared rays 7 are not reflected. Therefore, the phototransistor is not operated. In this way, the used amount of electric power and the like can be detected in detail with the simple circuit constitution, and the low cost can be realized.

Description

[Detailed description of the invention]

[Purpose of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmitting device that can precisely detect the amount of power used.

0002

2. Description of the Related Art With the increase in the number of housing complexes and buildings, electricity meters equipped with transmitting devices, for example, are being used in order to improve the efficiency of meter reading operations and reduce the cost of meter reading through on-site meter reading. The transmitting device of the electricity meter outputs a pulse proportional to the amount of electricity.

Referring to FIG. 3, a method for detecting pulses proportional to electric power will be explained. Similar to a normal electricity meter that does not have a transmitting device, the rotation of the disc 21 proportional to the amount of electricity causes the number wheel 1 of the measuring device 22 to rotate via a mechanical subtraction mechanism such as a worm 23 or a gear 24. , display the amount of electricity. A magnet 25 is incorporated in the lowest number wheel 1, and a magnetic resistance element 26 is attached near it. As the lowest number wheel 1 rotates, the magnet 25
When the magnetoresistive element 26 rotates, 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 a comparator. This digital signal is used to output pulses for contact relay output and open collector output.

[0004] Magnet 2 built into number wheel 1
5 is magnetized with 10 poles or 1 pole as shown in FIG. In the case of 10-pole magnetization, the magnetic field changes to output 10 pulses per revolution of the lowest number wheel, and in the case of 1-pole magnetization, the magnetic field is changed to output 1 pulse per revolution of the lowest number wheel.

[0005]

[Problem to be Solved by the Invention] However, in such a transmitting device, in order to increase the pulse frequency to precisely detect the amount of electric power, it is necessary to increase the number of magnetized poles of the magnet 25, but the lowest number Since the magnet 25 built into the car 1 is small, the number of magnetized poles is limited. Therefore, it is possible to obtain high pulses by detecting the rotation of the disc 21 of the watt-hour meter and dividing the frequency of the detection signal to match each rating. Therefore, a frequency division circuit and a circuit for setting the frequency division ratio are required, which increases the complexity of the circuit configuration and increases the cost. An object of the present invention is to provide a low-cost transmitting device that can precisely detect the amount of power used without requiring a magnet or a frequency dividing circuit. [Structure of the invention]

[0006]

[Means and operations for solving the problems] In order to achieve the above object, the present invention detects the rotation of a disk that rotates in proportion to the amount of electricity, gas, water, etc. used, and converts it into an electric signal. A transmitting device that outputs pulses in proportion to the amount used is provided with measurement display sections having different reflectances, a measurement means for detecting rotation of the disk, a light emitting means for emitting light to the measurement means, and a measurement means. The light receiving means receives the light reflected from the light emitting means, and the converting means converts the detected value of the light receiving means into an electrical signal. Therefore, the power can be increased by increasing the pulse frequency without the need for a frequency dividing circuit, etc. The amount can be detected finely and costs can be reduced.

[0007]

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a front view of the measuring section of the transmitting device of the present invention.

Number wheel 1 becomes 1 when the lowest digit rotates once.
There are some that display 0 kWh of power and others that display 1 kWh of power. In the former case, the base color of the number wheel 1 is black and the numbers and scale display are white, and in the latter case, the base color is white and the numbers and scale display are black (Figure 1 shows an example of the latter). . A hundredth scale 3 is displayed along the entire circumference next to the number, and a 10th scale 4 is displayed every 10 scales.
is displayed for a long time. Furthermore, the display of the zero digit scale 5 is longer than that of the 10th scale 4. Further, a reflective photosensor 2 is arranged on the lower surface of the number wheel 1 that faces the outer peripheral surface thereof. If the infrared rays 7 emitted from the reflective photosensor 2 hit the white part of the hundredth scale 3 of the number wheel 1, the reflected light is detected by a phototransistor in the photosensor 2, and an output (not shown) is generated. The comparison circuit in the stage converts it into a digital signal and outputs it. Conversely, if the infrared light 7 emitted from the reflective photosensor 2 hits the black part of the hundredth scale 3 of the number wheel 1, the phototransistor will not operate because the infrared light 7 will not be reflected. .

As mentioned above, in order to measure the amount of electric power, the rotation of the disk 21 is transmitted to the measuring device 22 via the subtraction mechanism, thereby causing the number wheel 1 to rotate. Therefore, the white and black parts of the hundredth division scale 3 of the number wheel 1 are alternately hit by the infrared light 7 of the photosensor 2, so that a signal proportional to the amount of electric power can be obtained.

[0010] In order to detect a signal of 100 pulses per revolution of the number wheel, the photosensor 2 is placed so as to face the lower surface of the hundredth division scale 3. In order to detect a signal of 10 pulses per rotation of the number wheel, the photo sensor 2 is placed facing the lower surface of the 10th scale 4. Similarly, in order to detect a signal of one pulse per rotation of the number wheel, the photosensor 2 is placed opposite the lower surface of the zero number scale 5. In this photosensor 2, infrared light 7 emitted from a photodiode inside the photosensor 2 hits a reflecting surface and a phototransistor inside the photosensor 2 is turned on or off depending on whether or not it is reflected. A comparator is connected to the next stage to convert the on/off signal of the phototransistor into a digital signal, and the signal is used to output pulses such as open collector output and contact output. By arranging the photosensors 2 in correspondence with the equal division scale in this manner, the pulse frequency can be increased with a simple circuit configuration.

Another embodiment of the present invention is shown in FIG. 2, in which the number wheel 1 is made of plastic and the scale display and the background color of the outer peripheral surface are black and the transparent color of the plastic, or the scale display and the base color of the outer peripheral surface are black. In the case of transparent plastic color and black color, the scale arrangement is from the hundredth scale to the zero display scale as described above.

A photo interrupter 31 (transmission type photosensor) is arranged so as to sandwich the scale display portion of the lowest number wheel 1. This interrupter 31 has a U-shape in which infrared light 7 is emitted from one side and received by the opposite side. That is, the transparent portion of the plastic transmits the infrared light 7, and the black portion blocks the infrared light, so the photointerrupter 31 is turned on when the plastic is transmitted, and is turned off when it is blocked. Therefore, since the rotation of the number wheel 1 for measuring and displaying the amount of electric power transmits or blocks infrared light, the same effect can be obtained.

[0013]

[Effects of the Invention] As described above, the present invention detects the rotation of a disk that rotates in proportion to the amount of electricity, gas, water, etc. used.
In a transmitting device that outputs a pulse proportional to the amount used by converting it into an electrical signal, a measuring display section with different reflectance is provided, a measuring means for detecting the rotation of the disk, and a light emitting device that emits light on this measuring means. The light receiving means receives the light reflected from the light emitting means from the measuring means, and the converting means converts the detection value of the light receiving means into an electrical signal, so the amount of electricity used can be reduced with a simple circuit configuration. It is possible to obtain a transmitting device that can perform detailed detection and is low cost.

[Brief explanation of the drawing]

FIG. 1 is a front view of a number wheel of a transmitting device showing an embodiment of the present invention.

FIG. 2 is a front view of a number wheel of a transmitting device according to another embodiment of the present invention.

FIG. 3 is a configuration diagram of a conventional transmitting device.

FIG. 4 is a diagram showing magnetization of the magnet in FIG. 3;

[Explanation of symbols]

Claims (1)

[Claims] Claim 1: A transmitting device that detects the rotation of a disk that rotates in proportion to the amount of electricity, gas, water, etc. used, converts it into an electrical signal, and outputs a pulse proportional to the amount of electricity, gas, water, etc. used. A measuring means for detecting the rotation of the disc, a light emitting means for emitting light to the measuring means, and a light receiving means for receiving reflected light from the light emitting means from the measuring means. and conversion means for converting the detection value of the light receiving means into an electrical signal.