EP0345992A1
Expired / Lapsed
EP
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Improvements in or relating to measuring instruments
Assignee: AVO MEGGER INSTRUMENTS LIMITED
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Filing: 1989-05-31
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Granted: —
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Expires: 2009-05-31
Abstract
Abstract A scale is disclosed for a measuring instrument comprising a plurality of display elements, specifically liquid crystal display elements which are energisable to a visible condition or an enhanced visible condition selectively to provide a linear scale or a logarithmic scale. The scale is divided into decades which specifically have twelve display elements of which ten are selectively energisable to provide the linear scale and then to provide the logarithmic scale.
Inventors
- 👤 Hugh Richard Marsh
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 22:23
CPC Classifications
G; G01; G01R; G01R1/00; G01R1/02; G01R1/08
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
83 words
A scale for a measuring instrument comprising a plurality of display elements which are energisable to a visible condition or an enhanced visible condition and which divide the scale into a plurality of substantially equal sections or decades and which sub-divide each section or decade into a plurality of substantially equal sub-sections to provide a linear scale and at least two additional display elements in each section towards the end of increasing magnitude to transform the linear scale into a substantially logarithmic scale.
Claim 2
Dependent Claim
83 words
A scale for a measuring instrument comprising a plurality of display elements which are energisable to a visible condition or an enhanced visible condition and which divide the scale into a plurality of substantially equal sections or decades and which sub-divide each section or decade into a plurality of substantially equal sub-sections to provide a linear scale and at least two additional display elements in each section towards the end of increasing magnitude to transform the linear scale into a substantially logarithmic scale.
Claim 3
Dependent Claim
49 words
A scale according to claim 1 including a further plurality of display elements which are energisable to a visible condition or an enhanced visible condition and which are arranged as pointers directed towards the sub-sections of the linear scale and which correspond in number to the number of sub-sections.
Claim 4
Dependent Claim
18 words
A scale according to claim 1 or 2 in which the display elements are liquid crystal display elements.
Claim 5
Dependent Claim
43 words
A scale according to any one of claims 1 to 3 in which twelve display elements are provided per decade of which ten are selectively energisable to provide a substantially logarithmic scale and ten are selectively energisable to provide a substantially linear scale.
Claim 6
Dependent Claim
67 words
A scale according to claim 4 in which considered in the direction of increasing magnitude on the logarithmic scale, and considering the first display element defining the beginning of the decade to be the first, the sixth and the eighth display element and each supplemented by a separate further element which can be energised to increase their apparent length to emphasise the half-way stage of the decade.
Claim 7
Dependent Claim
19 words
A scale according to any one of the preceding claims in which scale is of a flattened arc configuration.
Claim 8
Dependent Claim
39 words
A measuring instrument incorporating a scale according to any one of claims 1 to 4 together with means for selectively energising the display elements to make visible or enhance the visibility of the linear scale and the logarithmic scale.
References Cited (Backward Citations)
US4174500A
Cited
FR2313663A1
Cited
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