Browse Prior Art Database

Ceramic Magnet Voice Coil Motor

IP.com Disclosure Number: IPCOM000047950D
Original Publication Date: 1983-Dec-01
Included in the Prior Art Database: 2005-Feb-08
Document File: 2 page(s) / 63K

Publishing Venue

IBM

Related People

McVicke, CP: AUTHOR [+2]

Abstract

A method of magnetizing the ceramic magnet assembly of a voice coil motor (VCM), shown in the exploded view in Fig. 1, is described. The VCM of Fig. 1 is similar in general to that disclosed in U. S. Patent 4,136,293 except that the ceramic magnet assembly shown in Figs. 2a and 2b, comprising four separate ceramic magnets and a center block, are substituted for the magnet assembly shown in the patent. The magnet assembly shown in Figs. 2a and 2b comprises the rectangular center block 10, the pair of rectangular ceramic magnets 11a and 11b which are disposed on the top and bottom sides of block 10, a housing assembly 12 comprising a housing 13 and a pair of ceramic magnets 14a and 14b which are attached to the sides of the housing 13. Fig.

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Ceramic Magnet Voice Coil Motor

A method of magnetizing the ceramic magnet assembly of a voice coil motor (VCM), shown in the exploded view in Fig. 1, is described.

The VCM of Fig. 1 is similar in general to that disclosed in U. S. Patent 4,136,293 except that the ceramic magnet assembly shown in Figs. 2a and 2b, comprising four separate ceramic magnets and a center block, are substituted for the magnet assembly shown in the patent. The magnet assembly shown in Figs. 2a and 2b comprises the rectangular center block 10, the pair of rectangular ceramic magnets 11a and 11b which are disposed on the top and bottom sides of block 10, a housing assembly 12 comprising a housing 13 and a pair of ceramic magnets 14a and 14b which are attached to the sides of the housing 13. Fig. 3 is a rear view of the VCM illustrating the overlapping interrelationships of the two pairs of magnets 11 and 14. Fig. 4 illustrates the charging arrangement for the magnets 14a and 14b. The charging arrangement provides a pair of flux paths 17 and 18 normal to the surface of magnets 14a and 14b which are adjacent to the center block 10 in the final assembly. Fig. 5 illustrates the charging arrangement for the magnets 11a and 11b which are attached to the center block 10 so as to establish the direction of flux in these magnets which is also normal to the surface of the magnets adjacent the center block. The Fig. 5 charging arrangement creates a pair of flux paths 19 and 20 which magnetize the ma...