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| Thermal transfer dye image-receiving sheet |
| An object of the present invention is to provide a thermal transfer dye image-receiving sheet ... |
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| Curl-resistant printing sheet for labels and tags |
| OF THE INVENTION Referring more particularly to the drawings, FIG. 1 shows a three-layer sheet 2 ... |
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| Thermal transfer dye image-receiving sheet |
| An object of the present invention is to provide a thermal transfer dye image-receiving sheet ... |
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| Embossed glass/plastic laminate |
| I have discovered that a decorative relief pattern can be obtained on a glass/plastic laminate by ... |
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| Plasticized polyvinyl butyral sheet containing epoxy resin |
| OF THE INVENTION In addition to stabilizing adhesion to photoreactive component(s) of a heat-wave-... |
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| Antifog film laminates |
| A laminate comprises a first substrate including a first layer of a blend of a polyolefin and an ... |
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| Tear resistant multilayer films and articles incorporating such films |
| In general, this invention relates to a tear resistant film comprising more than five layers ... |
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| Preparation of glass/plastic laminates having improved optical quality |
| In accordance with the present invention, a process is provided for controlling optical defects in ... |
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Sensor
| Details |
Inventors: Chiang, Justin N.; Toth, James; Beadling, William C.;
Assignee:
Primary Examiner: Jackson; Stephen W.
Assistant Examiner:
Attorney, Agent or Firm: Gerstner; Marguerite E.
A laminar sensor for detecting changes on a laminar substrate. The sensor includes a laminar sheet which has a first surface and a second opposite surface, and is made from a conductive polymer composition which exhibits PTC behavior. A plurality of sensing elements are electrically connected in series on the sensor. Each sensing element is formed as an electrode pair containing a first electrode and a second electrode. The first and second electrodes may be on the same surface of the laminar sheet or on opposite surfaces of the sheet. Two electrical leads are present for connecting the sensing elements into a circuit, which may be used to detect changes in resistance which occur when a sensing element is exposed to an elevated temperature, a change in pressure, or a solvent. |
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DETAILED DESCRIPTION The approach taken in Japanese Patent Application No.
10-95019 requires that the entire battery cell heat to a temperature sufficient to cause the PTC conductive polymer composition to switch.
This means that if there is a relatively small hot spot inside the battery cell, which is sufficient to cause damage to a small region of the battery but is insufficient to heat the entire cell, it will not be detected.
Many batteries, such as lithium ion polymer batteries have a layered sheet construction in which an anode and a cathode are separated by a separator, and in addition comprise an electrolyte.
In practice, the layered sheet is rolled into a cylinder and positioned inside a can to form a battery cell.
A hot spot in the center of the cylinder, due, for example, to inhomogeneities in the anode, cathode, or separator, can cause damage to the electrolyte, which is solvent-based.
It is, therefore, desirable to have a sensor which can detect not just the temperature of the entire battery cell, but rather the temperature of individual spots within the battery cell.
In another application, a lithium ion polymer battery, used unrolled in its thin, flat configuration, can be positioned behind the screen of a laptop computer to detect temperature changes.
For this application, it is necessary to have an array of sensing elements as a point sensor applied to one part of the screen may not reflect a change elsewhere on the screen.
Detecting individual spots on a substrate is also important for articles other than batteries.
It is desirable to have a sensor in which the pattern of the sensing elements can be designed for a specific configuration, so that individual components, e.
g.
individual elements on a printed circuit board, can be in contact with the sensor.
Such a sensor can be used for situations in which the temperature at one spot is not representative of the entire surface, but for which sensing is still required.
Furthermore, it is desirable to have a sensor which can be used to detect hot spots over two dimensions and over a large area
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Manufacturing Materials 
