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公开(公告)号：AU7968998A
公开(公告)日：1999-01-25
申请号：AU7968998
申请日：1998-06-12
Applicant: MINNESOTA MINING & MFG
Inventor： ERWIN ROBERT L , BENSON GERALD M , SMITH KENNETH L , LUTTRELL DAN E
Abstract: Laminae suitable for use in molds for forming retroreflective cube corner elements and methods for making such laminae are disclosed. A representative lamina includes a first row of cube corner elements disposed in a first orientation and a second row of optically opposing cube corner elements disposed. The working surface of a lamina is provided with a plurality of cube corner elements formed by the optical surfaces defined by three groove sets. Opposing first and second groove sets are formed in the working surface of a lamina. The first groove set forms a plurality of structures having first and second optical surfaces disposed in mutually perpendicular planes that intersect along a reference edge. The second groove set forms a corresponding plurality of structures on the opposite side of the lamina. A third groove is formed in the working surface of the lamina along an axis substantially perpendicular to the axes of the grooves of the first and second groove sets. The surfaces of the third groove intersect the surfaces of the plurality of structures in substantially mutually perpendicular planes to define a plurality of cube corner elements. A plurality of such laminae can be assembled to form a mold useful in the manufacture of retroreflective products such as cube corner sheeting.
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公开(公告)号：AU5509898A
公开(公告)日：1999-01-25
申请号：AU5509898
申请日：1997-11-24
Applicant: MINNESOTA MINING & MFG
Inventor： SMITH KENNETH L , BENSON GERALD M
IPC: G02B5/124
Abstract: A retroreflective sheeting includes a first array of cube corner element opposing pairs and a second array of cube corner element opposing pairs. The symmetry axes of the cube corner elements in the first and second arrays are tilted in a backward direction at an angle of about 12 DEG to about 30 DEG from an axis normal to a base surface. The second array of cube corner elements is oriented approximately perpendicular to the first array to yield a retroreflective article providing generally uniform total light return about a 360 DEG range of orientation angles and/or a minimum total light return of about 5% across such 360 DEG range. Also disclosed is a mold assembly suitable for use in forming the present retroreflective sheeting and a method of making a retroreflective article using the mold.
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公开(公告)号：AU700787B2
公开(公告)日：1999-01-14
申请号：AU5988796
申请日：1996-06-06
Applicant: MINNESOTA MINING & MFG
Inventor： SMITH KENNETH L , BENSON GERALD M
Abstract: The invention provides a thin, flexible retroreflective sheeting formed from a substantially optically transparent material. The sheeting comprises a substrate having a base surface disposed in a base plane; a structured surface opposite the base surface that contains at least one array of canted cube corner element matched pairs formed by three intersecting sets of substantially parallel grooves including a primary groove set, and two sets of secondary grooves, each matched pair including a first canted cube corner element and a second canted cube corner element disposed opposite a primary groove from the first element, wherein (a) opposing cube corner elements in a given array have their symmetry axes canted in a first plane and through a predetermined cant angle measuring between 4 DEG and 15 DEG from an axis extending normally from the base; (b) the sheeting of this given array exhibits its broadest range of entrance angularity in a second plane angularly displaced from the first plane, and in a third plane, angularly displaced from the first plane; and substantially each of the cube corner element arrays is oriented such that either the second or third plane is approximately parallel with an edge of the sheeting.
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公开(公告)号：CA2242771A1
公开(公告)日：1997-07-24
申请号：CA2242771
申请日：1996-12-05
Applicant: MINNESOTA MINING & MFG
Inventor： BENSON GERALD M , FREY CHERYL M , LASCH JAMES E , SZCZECH THEODORE J , KELLIHER JOHN C , SMITH KENNETH L , NESTEGARD SUSAN K
IPC: G02B5/124
Abstract: A cube corner retroreflective sheeting construction comprising alternating zones of cube corner element arrays disposed at approximately ninety degrees orientations to provide exactly two principal planes of improved retroreflective performance in response to light incident on the sheeting at high entrance angles is disclosed. According to one embodiment the sheeting includes a body layer which has an elastic modulus less than 7 X 108 pascals and cube corner elements formed from a material which has an elastic modulus greater than 16 X 108 pascals. According to a second embodiment the sheeting includes an overlay film having two major surfaces and comprising a first polymeric material and a plurality of arrays of substantially independent cube corner elements bonded to a major surface of the overlay film having a minimal, fractured land.
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公开(公告)号：AU5988796A
公开(公告)日：1997-01-09
申请号：AU5988796
申请日：1996-06-06
Applicant: MINNESOTA MINING & MFG
Inventor： SMITH KENNETH L , BENSON GERALD M
Abstract: The invention provides a thin, flexible retroreflective sheeting formed from a substantially optically transparent material. The sheeting comprises a substrate having a base surface disposed in a base plane; a structured surface opposite the base surface that contains at least one array of canted cube corner element matched pairs formed by three intersecting sets of substantially parallel grooves including a primary groove set, and two sets of secondary grooves, each matched pair including a first canted cube corner element and a second canted cube corner element disposed opposite a primary groove from the first element, wherein (a) opposing cube corner elements in a given array have their symmetry axes canted in a first plane and through a predetermined cant angle measuring between 4 DEG and 15 DEG from an axis extending normally from the base; (b) the sheeting of this given array exhibits its broadest range of entrance angularity in a second plane angularly displaced from the first plane, and in a third plane, angularly displaced from the first plane; and substantially each of the cube corner element arrays is oriented such that either the second or third plane is approximately parallel with an edge of the sheeting.
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Patent Agency Ranking
公开(公告)号：CA2224095A1
公开(公告)日：1996-12-27
申请号：CA2224095
申请日：1996-06-06
Applicant: MINNESOTA MINING & MFG
Inventor： BENSON GERALD M , SMITH KENNETH L
Abstract: The present invention provides a tiled cube corner retroreflective sheeting that exhibits improved retroreflective performance in at least one plane substantially parallel with an edge of the sheeting, and preferably in two or more planes. A tiled retroreflective sheeting includes a structured surface having a plurality of cube corner element arrays oriented at predetermined angles relative to the edge of the sheeting. The angles are selected to align at least one broad plane of entrance angularity approximately parallel with the edge of the sheeting and preferably to align another broad plane of entrance angularity approximately perpendicular to the edge of the sheeting.
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公开(公告)号：CA2224001A1
公开(公告)日：1996-12-27
申请号：CA2224001
申请日：1996-06-06
Applicant: MINNESOTA MINING & MFG
Inventor： BENSON GERALD M , SMITH KENNETH L
Abstract: The present invention provides improved cube corner retroreflective articles which exhibit a wide range of retroreflective entrance angularity in at least one plane, and preferably in two or more planes. An article in accordance with the present invention includes a structured surface having at least one array of cube corner elements formed by three intersecting sets of substantially parallel grooves. Each cube corner element includes a base triangle bonded by one groove from each of the three intersecting groove sets, the base triangle being scalene.
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公开(公告)号：DE3774493D1
公开(公告)日：1991-12-19
申请号：DE3774493
申请日：1987-06-11
Applicant: MINNESOTA MINING & MFG
Inventor： BENSON GERALD M
IPC: G02B5/124
Abstract: Cube-corner retroreflector capable of reflecting light over a wide range of incidence angles. The reflector, which in some embodiments may be in the form of flexible sheeting, comprises a transparent body (23) configured on its rear surface (24) with at least one set of three mutually perpendicular surfaces providing cube-corner retroreflection of light (28) beamed against the front of the body, and a specularly reflective surface (29) which is shaped as a negative of the aforementioned set of three mutually perpendicular surfaces and which is interfitted with and closely spaced from that set of rear surfaces, with the adjacent and matching portions of the specularly reflective and rear surfaces being substantially parallel to one another.
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公开(公告)号：CA2221189C
公开(公告)日：2008-08-05
申请号：CA2221189
申请日：1996-06-06
Applicant: MINNESOTA MINING & MFG
Inventor： SMITH KENNETH L , BENSON GERALD M
Abstract: The invention provides a thin, flexible retroreflective sheeting formed from a substantially optically transparent material. The sheeting comprises a substrate having a base surface disposed in a base plane; a structured surface opposite the base surface that contains at least one array of canted cube corner element matched pairs formed by three intersecting sets of substantially parallel grooves including a primary groove set, and two sets of secondary grooves, each matched pair including a first canted cube corner element and a second canted cube corner element disposed opposite a primary groove from the first element, wherein (a) opposing cube corner elements in a given array have their symmetry axes canted in a first plane and through a predetermined cant angle measuring between 4 DEG and 15 DEG from an axis extending normally from the base; (b) the sheeting of this given array exhibits its broadest range of entrance angularity in a second plane angularly displaced from the first plane, and in a third plane, angularly displaced from the first plane; and substantially each of the cube corner element arrays is oriented such that either the second or third plane is approximately parallel with an edge of the sheeting.
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公开(公告)号：AT236001T
公开(公告)日：2003-04-15
申请号：AT97953113
申请日：1997-12-09
Applicant: MINNESOTA MINING & MFG
Inventor： BENSON GERALD M , KELLIHER JOHN C , SMITH KENNETH L
Abstract: A method is disclosed for manufacturing a plurality of laminae for use in a mold suitable for use in forming retroreflective cube corner articles. Each lamina has opposing first and second major surfaces defining therebetween a first reference plane. Each lamina further includes a working surface connecting the first and second major surfaces. The working surface defines a second reference plane substantially parallel to the working surface and perpendicular to the first reference plane and a third reference plane perpendicular to the first reference plane and the second reference plane. The method includes orienting a plurality of laminae to have their respective first reference planes parallel to each other and disposed at a first angle relative to a fixed reference axis. At least two groove sets are formed in the working surface. Each groove set includes at least two parallel adjacent V-shaped grooves in the working surface of the laminae. The at least two groove sets form first, second and third groove surfaces that intersect substantially orthogonally to form a plurality of cube corner elements. Each of the plurality of cube corner elements is preferably located on essentially one of the plurality of lamina. The plurality of laminae can be oriented at a second angle relative to the fixed reference axis prior to forming at least one of the groove sets. A mold according to the present invention and a retroreflective article made therefrom are also disclosed.
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