Browse Prior Art Database

Fabrication of a High Density Magnetic Printhead Array

IP.com Disclosure Number: IPCOM000059905D
Original Publication Date: 1986-Feb-01
Included in the Prior Art Database: 2005-Mar-08
Document File: 3 page(s) / 71K

Publishing Venue

IBM

Related People

Heidrich, PF: AUTHOR [+3]

Abstract

A key element for the success of a high speed, high resolution magnetic printer is fabrication of the head array to meet several criteria. Clearly a head element per pel (picture element) from a stationary printhead is desired to achieve high speed and reliability. This stationary, high density magnetic printhead will contain approximately 500 elements per inch which must be assembled into a small area, and must be a multiplexed array which implies at least two independent wires per head element. The gap size must be narrow for high resolution; however, insertion of multiplexing wires through the gap then becomes difficult in the light of wire geometry and power requirements. Magnetic and electrical isolation between head elements is essential to assure uniform and reliable magnetic printing.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 52% of the total text.

Page 1 of 3

Fabrication of a High Density Magnetic Printhead Array

A key element for the success of a high speed, high resolution magnetic printer is fabrication of the head array to meet several criteria. Clearly a head element per pel (picture element) from a stationary printhead is desired to achieve high speed and reliability. This stationary, high density magnetic printhead will contain approximately 500 elements per inch which must be assembled into a small area, and must be a multiplexed array which implies at least two independent wires per head element. The gap size must be narrow for high resolution; however, insertion of multiplexing wires through the gap then becomes difficult in the light of wire geometry and power requirements. Magnetic and electrical isolation between head elements is essential to assure uniform and reliable magnetic printing. The magnetic recording path for each head element must have adequate magnetic moment to avoid head saturation when rear- surface magnetic printing is desired. A method of fabricating a magnetic printer meeting all of the above criteria is described which can be adapted to either transverse or longitudinal magnetic printing. This array head is formed by laminations of a high permeability post array structure [1,2] and etched copper bit and word line wiring to form a multiplexed magnetic recording head for the production of magnetic latent images. Fabrication of a transverse magnetic printhead will be described, and the conversion to a longitudinal magnetic printhead will be explained. To achieve the above criteria a two-dimensional head array will be necessary, which can be commonly described as a staggered array. The magnetic printhead fabrication technique can be understood with reference to Fig. 1(a), where one of the high permeability inserts 1 fabricated from etched laminations 2 is inserted into a machined slot 3 in circuit board 4 and secured in place with a suitable epoxy. The circuit board 4 forms the base of the head structure which is a typical multilayer circuit board with plated through holes 5 which connect to several wiring planes 6 (Fig. 1(b)) below the surface 7 which connect groups of head elements into a word and bit l...