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公开(公告)号：US3600588A
公开(公告)日：1971-08-17
申请号：US3600588D
申请日：1969-12-10
Applicant: NAT RES DEV
Inventor： SAYCE LEONARD ALFRED
CPC classification number: G01D5/38 , G01D5/34715
Abstract: An index grating for use in measuring apparatus in which relative movement between the index grating and a scale grating is monitored, consisting of a regular series of alternate transparent and opaque regions, the opaque regions constituting parts of a solid state photocell. There is also described a reading head incorporating such an index grating.
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