Method of identifying direction of multilayer ceramic capacitor, apparatus identifying direction of multilayer ceramic capacitor, and method of manufacturing multilayer ceramic capacitor

• US 9,714,921 B2
• Filed: 06/03/2015
• Issued: 07/25/2017
• Est. Priority Date: 06/25/2014
• Status: Active Grant

• Current Assignee: Murata Manufacturing Co Limited
• Original Assignee: Murata Manufacturing Co Limited
• Inventors: Hayashi, Akihiro, Takahashi, Minako, Sasaoka, Yoshikazu
• Primary Examiner(s): Ledynh, Bot
• Assistant Examiner(s): NASIR, TAQI R
• Application Number:
  US14/729,994
• Publication Number:
  US 20150377833A1
• Time in Patent Office: 783 Days
• Field of Search: 324228, 324328, 324519, 32475017, 324548, 324 7666, 324331, 324345, 324381, 324463, 324219, 324246, 324259-263, 324529, 32475012, 32475417
• CPC Class Codes: G01N 27/72 by investigating magnetic variables

Abstract

A method of identifying a direction of a multilayer ceramic capacitor includes the steps of transporting a plurality of multilayer ceramic capacitors in one line before each of a magnetism generator and a magnetic flux density measurement instrument, measuring a magnetic flux density with the magnetic flux density measurement instrument at the time when each of the plurality of multilayer ceramic capacitors passes before the magnetic flux density measurement instrument, and identifying a direction of stack of the multilayer ceramic capacitors based on the magnetic flux density measured in the step of measuring a magnetic flux density.

Claims

1. A method of identifying a direction of stack of a multilayer ceramic capacitor including a plurality of stacked internal electrodes, comprising the steps of:

transporting a plurality of multilayer ceramic capacitors in one line before each of a magnetism generator and a magnetic flux density measurement instrument;

measuring a magnetic flux density with said magnetic flux density measurement instrument when each of said plurality of multilayer ceramic capacitors passes before said magnetic flux density measurement instrument; and

identifying said direction of stack based on said magnetic flux density measured in said step of measuring a magnetic flux density.

2. The method of identifying a direction of a multilayer ceramic capacitor according to claim 1, wherein

in said step of identifying said direction of stack, an integral value of the magnetic flux density is calculated based on said magnetic flux density measured in said step of measuring a magnetic flux density and said direction of stack is identified based on the integral value of said magnetic flux density.

3. The method of identifying a direction of a multilayer ceramic capacitor according to claim 1, wherein

said magnetism generator and said magnetic flux density measurement instrument are opposed to each other, and

in said step of measuring a magnetic flux density, said magnetic flux density measurement instrument measures a density of a magnetic flux generated from said magnetism generator when each of said plurality of multilayer ceramic capacitors passes between said magnetism generator and said magnetic flux density measurement instrument.

4. The method of identifying a direction of a multilayer ceramic capacitor according to claim 1, wherein

said magnetism generator is arranged upstream of said magnetic flux density measurement instrument in a direction of transportation of said plurality of multilayer ceramic capacitors, and

the method further comprises the step of magnetizing each of said plurality of multilayer ceramic capacitors before said step of measuring a magnetic flux density.

5. The method of identifying a direction of a multilayer ceramic capacitor according to claim 1, wherein

in said step of transporting a plurality of multilayer ceramic capacitors, said plurality of multilayer ceramic capacitors are transported to pass through a linear transportation path, and

in said step of measuring a magnetic flux density, said magnetic flux density measurement instrument measures the magnetic flux density when said plurality of multilayer ceramic capacitors pass before said magnetic flux density measurement instrument as said plurality of multilayer ceramic capacitors pass through said linear transportation path.

6. The method of identifying a direction of a multilayer ceramic capacitor according to claim 1, wherein

in said step of transporting a plurality of multilayer ceramic capacitors, said plurality of multilayer ceramic capacitors are transported while said plurality of multilayer ceramic capacitors are accommodated in a plurality of accommodation portions provided along an outer circumference of an annular rotor, respectively, and

in said step of measuring a magnetic flux density, said magnetic flux density measurement instrument measures the magnetic flux density when said plurality of multilayer ceramic capacitors pass before said magnetic flux density measurement instrument while said plurality of multilayer ceramic capacitors are accommodated in said plurality of accommodation portions, respectively.

7. The method of identifying a direction of a multilayer ceramic capacitor according to claim 1, wherein

in said step of transporting a plurality of multilayer ceramic capacitors, said plurality of multilayer ceramic capacitors are transported while said plurality of multilayer ceramic capacitors are accommodated in a plurality of cavities, respectively, which are provided in a taping, and

in said step of measuring a magnetic flux density, said magnetic flux density measurement instrument measures the magnetic flux density when said plurality of multilayer ceramic capacitors pass before said magnetic flux density measurement instrument while said plurality of multilayer ceramic capacitors are accommodated in said plurality of cavities, respectively.

8. A method of manufacturing a series of multilayer ceramic capacitors, comprising the steps of:

identifying said direction of stack with the method of identifying a direction of a multilayer ceramic capacitor according to claim 1; and

accommodating a plurality of multilayer ceramic capacitors identical in said direction of stack in a plurality of cavities provided in a taping, respectively.