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Curved Flexible Printed Circuit Cable

IP.com Disclosure Number: IPCOM000103888D
Original Publication Date: 1993-Feb-01
Included in the Prior Art Database: 2005-Mar-18
Document File: 2 page(s) / 69K

Publishing Venue

IBM

Related People

Ando, H: AUTHOR [+3]

Abstract

Curved flexible cable which reduces interactive force between an actuator and a flexible cable is disclosed.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 71% of the total text.

Curved Flexible Printed Circuit Cable

      Curved flexible cable which reduces interactive force between
an actuator and a flexible cable is disclosed.

      Most of usage of flexible cable FPC requires that the cable is
straight and flat so that substantial force is required to bend a
flexible cable which is commercially available.  If such flexible
cable is used in small form factor hard disk drive, it has to be
flexed to fit in the space between the suspension arm and connecting
terminal as shown in Fig. 1 and the force exerted by the flexed cable
necessitates extra counter force of voice coil motor to overcome the
force of the cable.  This leads to a design of larger voice coil
motor and increased current consumption of the motor.  If the cable
is prebent in a form that generally fits the space between the arm
and terminal, only smaller force is needed by the voice coil motor to
swing the arm.

      In general, flexible cable consists of a base film, a copper
film and a cover film, as shown in Fig. 2.  This is made by using the
following steps:

1.  Copper film is adhered to base film 1.

2.  Circuit pattern 2 is formed on the copper film by etching
    process.

3.  Holes 3 are punched on the cover film for later use as opening to
    land area of the circuit pattern.

4.  Cover film 4 is adhered to the base film over the circuit pattern
    while both the cover film and the base film tensioned
    differently.

      When the adhesiv...