Pressure measuring sheet and method for pressure measurement using said sheet
First Claim
1. A pressure-measuring sheet comprising a support having thereon a layer of microcapsules containing a color former capable of forming a color on contact with a color developer, the microcapsules in said layer satisfying the following relationship
wherein D is the volume average particle diameter of the microcapsules, and δ
/D = about 4.0 ×
10.sup.-2 to about 2.5 ×
10.sup.-1
is the number average capsule wall thickness of the microcapsules.
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Abstract
A broad range of pressures including planar and linear pressures can be measured by a pressure measuring sheet comprising a support having formed thereon a layer of microcapsules containing a color former in which the microcapsules satisfy the following relation
δ/D= about 4.0 × 10.sup.-2 to about 2.5 × 10.sup.-1
wherein D is the volume average particle size of the microcapsules, and δ is the number average capsule wall thickness of the microcapsules.
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Citations
9 Claims
- 1. A pressure-measuring sheet comprising a support having thereon a layer of microcapsules containing a color former capable of forming a color on contact with a color developer, the microcapsules in said layer satisfying the following relationship
- space="preserve" listing-type="equation">δ
/D = about 4.0 ×
10.sup.-2 to about 2.5 ×
10.sup.-1
wherein D is the volume average particle diameter of the microcapsules, and δ
is the number average capsule wall thickness of the microcapsules.- View Dependent Claims (2, 3, 4, 5)
- space="preserve" listing-type="equation">δ
- 6. A method for measuring pressure which comprises bringing a pressure measuring sheet having thereon a layer of microcapsules containing a color former capable of forming a color on contact with a color developer, the microcapsules in the layer satisfying the following relationship
- space="preserve" listing-type="equation">δ
/D = about 4.0 ×
10.sup.-2 to 2.5 ×
10.sup.-1
wherein D is the volume average particle diameter of the microcapsules, and δ
is the number average capsule wall thickness of the microcapsules,into contact with the site at which pressure is to be measured in the presence of a layer of a color developer, allowing the pressure to be applied to said sheet whereby said microcapsules are ruptured and a color is developed by contact with said color developer, and reading the pressure from changes in the optical density of or color of the developed colored image. - View Dependent Claims (7, 8, 9)
- space="preserve" listing-type="equation">δ
Specification
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- Resources
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Current AssigneeFuji Photo Film Co Limited (Fujifilm Holdings Corporation)
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Original AssigneeFuji Photo Film Co Limited (Fujifilm Holdings Corporation)
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InventorsOgata, Yasuhiro, Hosoi, Noriyuki
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Primary Examiner(s)Ciarlante, Anthony V.
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Application NumberUS05/736,666Time in Patent Office502 DaysField of Search73/88 R, 73/141 R, 428/307, 428/914, 428/323, 428/488US Class Current73/862.53CPC Class CodesG01L 1/247 using distributed sensing e...
