Browse Prior Art Database

Magnetic Clamp for Surface-Mounted Assembly of Electronic Components onto Circuit Cards

IP.com Disclosure Number: IPCOM000102415D
Original Publication Date: 1990-Nov-01
Included in the Prior Art Database: 2005-Mar-17
Document File: 2 page(s) / 83K

Publishing Venue

IBM

Related People

Vanderlee, KA: AUTHOR

Abstract

Disclosed is a device which temporarily holds the leads of surface- mounted electronic components in intimate contact with their corresponding mounting locations (called "pads") on a circuit card. This device is comprised of a ferromagnetic cap above the component and a static magnetic field source below the circuit card. (See the figure.) This device allows unrestricted access to the component leads from above so that permanent attachment of the component leads to the pads or other operations can take place. In addition, the ferromagnetic cap is reusable, and does not require any temporary, intermediary materials, such as solder paste or adhesive.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 52% of the total text.

Magnetic Clamp for Surface-Mounted Assembly of Electronic Components onto Circuit Cards

       Disclosed is a device which temporarily holds the leads
of surface- mounted electronic components in intimate contact with
their corresponding mounting locations (called "pads") on a circuit
card.  This device is comprised of a ferromagnetic cap above the
component and a static magnetic field source below the circuit card.
(See the figure.)  This device allows unrestricted access to the
component leads from above so that permanent attachment of the
component leads to the pads or other operations can take place. In
addition, the ferromagnetic cap is reusable, and does not require any
temporary, intermediary materials, such as solder paste or adhesive.

      In this device, a static magnetic field is supplied from below
the circuit card (see figure). This field can be supplied by a DC
electromagnet, magnetic chuck, or a moveable permanent magnet such
that an operator can turn it off or on in the location under the
component. A ferromagnetic cap 1 is placed over the surface-mounted
component 2, and then the magnetic field is turned on. This pulls the
ferromagnetic cap 1 against the component leads 3 and holds them
firmly against the circuit card pads 4. The space above the circuit
card thus remains free for other operations, such as the location and
movement of attachment tools and robots which serve to permanently
bond the component leads to the circuit card.

      In addition, the ferromagnetic cap could serve to hold the
component during registration...