G - Physics – 02 – B
Patent
G - Physics
02
B
G02B 5/124 (2006.01)
Patent
CA 2171745
A cube corner article and method of manufacturing the article from a series of unitary substrates. The method of manufacture comprises the first step of providing an initial non-unitary cube corner element array comprising a plurality of geometric structures including cube corner elements (212, 218). Then, a replica of the cube corner element array is produced as a substrate suitable for forming retroreflective surfaces. Portions of the replica substrate material are removed. The removal of these portions forms at least one cavity (206) bounded by side walls in the replica at a depth at least that of the cube corner elements. The replica is replicated to produce an additional directly machinable substrate suitable for forming retroreflective surfaces. The substrate comprises at least one raised section (208) having sidewalls at a height at least that of the cube corner elements. At least one raised section is directly machined to form a zone comprising a plurality of geometric structures including cube corner elements bounded by at least two sets of parallel grooves.
On décrit un article à trièdres trirectangles et un procédé permettant de le fabriquer à partir d'une série de substrats unitaires. Ce procédé consiste d'abord à produire un réseau initial de trièdres trirectangles non unitaires comprenant plusieurs ensembles géométriques, dont lesdits trièdres (212, 218). On produit ensuite un autre réseau qui servira de substrat pour former des surfaces rétroréflechissantes. On enlève des portions du matériau du second substrat pour former au moins une cavité (206) bordée par des parois latérales, présentant une profondeur au moins égale à celle des trièdres. On reproduit ce second substrat pour obtenir un nouveau substrat directement usinable, convenant à la formation de surfaces rétroréfléchissantes et comprenant au moins une section surélevée (208) dotée de parois latérales au moins aussi hautes que les trièdres. On usine directement au moins une section surélevée pour former une zone comprenant plusieurs ensembles géométriques, dont des trièdres trirectangles bordés par au moins deux ensembles de rainures parallèles.
Benson Gerald M.
Smith Kenneth L.
Minnesota Mining And Manufacturing Company
Smart & Biggar
LandOfFree
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