Patent ID: 6895069
Filing Date: 2005-05-17
Classification: G01D,G01F

Abstract:
1. An apparatus for counting the rotation frequency of a numeral wheel of a meter for a remote meter reading system, which is applied to a meter in which the numeral value of a numeral wheel counter formed with a plurality of numeral wheels accumulatively increases in proportion to the usage amount of a supply, the apparatus comprising: a light reflection means which is attached on part of the outer surface of any one numeral wheel of the numeral wheel counter so that a surface of the light reflection means having a high reflection rate is directed to the outside, and which reflects an incident infrared ray while rotating with the numeral wheel; a light sensor unit in which two independent holes are formed on one side of a case made of an opaque material, and an infrared ray emitter, which receives a driving pulse signal and intermittently emits an infrared ray, is disposed inside a first hole and an infrared ray sensor, which outputs an electric signal in proportion to the light amount of an infrared ray flowing into a second hole, is disposed inside the second hole; a light sensor fixing housing which has a structure in which the housing is detachably coupled with the meter while the light sensor unit is mounted and fixed inside the housing, and in an assembled state of the housing, the first hole and the second holes are located above a rotation path of the numeral wheel, on which the light reflection means is attached, and at least a part of the housing, covering the numeral wheel counter and a part on which meter product information is written, is transparent so as to be read from the outside, and has an infrared ray blocking function to block external infrared rays flowing into the inside; a micom which calculates the usage amount of the supply by counting the output electric signal from the infrared ray sensor to recognize the rotation frequency of the numeral wheel; and a power supply means which supplies power needed for the light sensor unit and the micom by using a battery power source, and in particular, provides the infrared ray emitter with the driving pulse signal.