ELECTRONIC DEVICE MOISTURE INDICATORS

• US 20100304091A1
• Filed: 05/26/2009
• Published: 12/02/2010
• Est. Priority Date: 05/26/2009
• Status: Active Grant

• Current Assignee: Apple Inc.
• Original Assignee: Apple Inc.
• Inventors: Wang, Erik L.
• Granted Patent: US 8,440,274 B2
• Time in Patent Office: Days
• US Class Current: 428/172
• CPC Class Codes: B32B 5/06 characterised by a fibrous or filamentary layer mechanically connected, e.g. by needling to another layer, e.g. of fibres, of paper
• CPC Class Codes: B32B 5/14 characterised by a layer differing constitutionally or physically in different parts, e.g. denser near its faces
• CPC Class Codes: G01D 7/00 Indicating measured values
• CPC Class Codes: G01D 7/005 Indication of measured value by colour change
• CPC Class Codes: G01N 31/222 for investigating moisture content
• CPC Class Codes: G06F 1/1626 with a single-body enclosure integrating a flat display, e.g. Personal Digital Assistants [PDAs]
• CPC Class Codes: G06F 1/1656 Details related to functional adaptations of the enclosure, e.g. to provide protection against EMI, shock, water, or to host detachable peripherals like a mouse or removable expansions units like PCMCIA cards, or to provide access to internal components for maintenance or to removable storage supports like CDs or DVDs, or to mechanically mount accessories mounting of accessories to a computer display G06F1/1607; display hoods G06F1/1603; cooling arrangements for portable computers G06F1/203
• CPC Class Codes: G09F 3/0291 Labels or tickets undergoing a change under particular conditions, e.g. heat, radiation, passage of time
• CPC Class Codes: H04M 1/0274 for an electrical connector module
• CPC Class Codes: H04M 1/18 Telephone sets specially adapted for use in ships, mines, or other places exposed to adverse environment H04M1/19 takes precedence
• CPC Class Codes: Y10T 428/13 Hollow or container type article [e.g., tube, vase, etc.]
• CPC Class Codes: Y10T 428/1303 Paper containing [e.g., paperboard, cardboard, fiberboard, etc.]
• CPC Class Codes: Y10T 428/1352 Polymer or resin containing [i.e., natural or synthetic]
• CPC Class Codes: Y10T 428/1379 Contains vapor or gas barrier, polymer derived from vinyl chloride or vinylidene chloride, or polymer containing a vinyl alcohol unit
• CPC Class Codes: Y10T 428/24612 Composite web or sheet
• CPC Class Codes: Y10T 428/24942 including components having same physical characteristic in differing degree
• CPC Class Codes: Y10T 428/249953 Composite having voids in a component [e.g., porous, cellular, etc.]
• CPC Class Codes: Y10T 428/31786 Of polyester [e.g., alkyd, etc.]
• CPC Class Codes: Y10T 428/31971 Of carbohydrate
• CPC Class Codes: Y10T 428/31993 Of paper

Abstract

Electronic devices may have sensitive circuitry. To determine whether an electronic device has been exposed to excessive amounts of moisture, the electronic device may be provided with a moisture indicator. The moisture indicator may have a wicking layer of white paper and a red dye layer. If a portion of the moisture indicator is exposed to moisture, red dye may bleed into the white paper. The moisture indicator may be mounted in an input-output port opening or other portion of the electronic device where the state of the moisture indicator is visible. The moisture indicator may have sealed edges to reduce sensitivity to small amounts of moisture intrusion. Different regions of the moisture indicator may be provided with different sensitivities by forming structures that have altered moisture flow properties, by altering wicking layer thicknesses, or by otherwise spatially modifying moisture sensitivity.

Claims

1. A moisture indicator structure, comprising:

a wicking layer;

a dye on the wicking layer; and

upper and lower moisture barrier layers that cover the wicking layer and the dye and that are sealed along at least one edge.

2. The moisture indicator structure defined in claim 1 wherein the wicking layer comprises regions of different thicknesses.

3. The moisture indicator structure defined in claim 2 wherein the wicking layer comprises at least first and second regions and wherein the moisture indicator structure comprises at least one moisture-flow-altering structure interposed between the first and second regions.

4. The moisture indicator structure defined in claim 1 wherein the wicking layer has an upper edge, a lower edge, a left edge, and a right edge and wherein the upper and lower moisture barrier layers are sealed along the right and left edges and along the lower edge and are not sealed along the upper edge.

5. The moisture indicator structure defined in claim 1 further comprising a solidified liquid along the edge, wherein the solidified liquid seals the upper moisture barrier layer to the lower moisture barrier layer.

6. The moisture indicator structure defined in claim 4 wherein the solidified liquid comprises paint.

7. The moisture indicator structure defined in claim 1 wherein the upper and lower moisture barrier layers comprise portions that touch each other to form a seal along the edge.

8. The moisture indicator structure defined in claim 1 wherein moisture barrier layers are sealed along the edge to form a sealed edge that prevents moisture from reaching the wicking layer, wherein the moisture barrier layers are not sealed along an unsealed edge, and wherein moisture enters the wicking layer between the upper and lower moisture barrier layers along the unsealed edge.

9. The moisture indicator structure defined in claim 8 wherein the upper and lower moisture barrier layers comprise polymer layers.

10. The moisture indicator structures defined in claim 1 further comprising a substance in a moisture-flow-impeding region of the wicking layer that impedes moisture flow.

11. The moisture indicator structures defined in claim 10 wherein the substance comprises wax.

12. The moisture indicator structure defined in claim 1 wherein the wicking layer comprises white paper, wherein the dye comprise red dye, and wherein the upper and lower moisture barrier layers comprise plastic.

13. The moisture indicator structure defined in claim 12 wherein the upper moisture barrier layer comprises a planar layer of transparent plastic.

14. A portable electronic device, comprising:

a housing having an opening; and

a moisture indicator in the opening, wherein the moisture indicator comprises first and second moisture barrier layers that are sealed together along at least one sealed edge of the moisture indicator.

15. The portable electronic device defined in claim 14 wherein the moisture indicator comprises a wicking layer and dye between the moisture barrier layers and wherein the moisture indicator comprises an unsealed edge through which moisture enters the wicking layer.

16. The portable electronic device defined in claim 15 wherein the opening comprises an input-output port having a first end in an interior portion of the portable electronic device and having a second end that is adjacent to exterior portions of the portable electronic device, wherein the moisture indicator is mounted within the input-output port so that the sealed edge is at the second end and the unsealed edge is at the first end.

17. The portable electronic device defined in claim 16 further comprising left and right sealed edges that are perpendicular to the unsealed edge.

18. The portable electronic device defined in claim 14 further comprising regions in the wicking layer of different thicknesses.

19. A water dot, comprising:

a wicking layer;

dye; and

a moisture barrier layer with openings that is interposed between the wicking layer and the dye.

20. The water dot defined in claim 19 wherein the moisture barrier layer comprises a pattern of holes that makes a first part of the moisture barrier layer more porous than a second part of the moisture barrier layer.