FILM TYPE CAPACITOR AND METHOD OF ADJUSTMENT

• US 3,821,617 A
• Filed: 06/18/1973
• Issued: 06/28/1974
• Est. Priority Date: 06/18/1973
• Status: Expired due to Term

• Current Assignee: RCA Corporation
• Original Assignee: Richter F, Shelby J
• Inventors: SHELBY J, RICHTER F
• Application Number:
  US05/370,615
• Time in Patent Office: 375 Days
• US Class Current: 361/303
• CPC Class Codes: H01G 4/255 Means for correcting the capacitance value
• CPC Class Codes: Y10T 29/435 Solid dielectric type

Abstract

An encapsulated film type capacitor which has a tail portion extending outwardly from the main body. Also a method of adjusting the capacitance value prior to encapsulation, comprising trimming off an end area of the top electrode on the tail portion.

Claims

1. A process comprising depositing on an insulating substrate a film type capacitor having top and bottom metallic electrodes and a layer of dielectric material between said electrodes, said electrodes including a main body and a narrow tail portion extending outward therefrom, adjusting the capacitance of said capacitor to a desired value by trimming off an end part extending entirely across at least the top electrode of said tail portion, and depositing a coating of insulating material over at least the end of said top electrode bordering said trimmed off portion.

2. A process according to claim 1 in which said main body of said top electrode has a length or width of about 100-200 mils and said tail portion has a width of about 50 mils.

3. A trimmed film type capacitor comprising a bottom metallic electrode adhered a substrate with a terminal, a top metallic electrode with a terminal and a layer of dielectric material between said electrodes, said electrodes including a main body portion and a tail portion extending outwardly from said body portions at a substantially right-angles, the end portion of said top electrodes being a trimmed portion having a rectangular shape.

4. A capacitor according to claim 3 in which said tail portion of the top electrode has a width which is about 1/4 to 1/2 that of said body portion.

5. A capacitor according to claim 4 in which said top electrode has an area less than said bottom electrode.