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A passive heat pipe structure used in a wearable device includes a multilayer stack of graphite sheets, each sheet having a plane high thermal conductivity oriented along a first axis and a plane of lower thermal conductivity along a second axis different from the first axis. The stack has a three-d

A passive heat pipe structure used in a wearable device includes a multilayer stack of graphite sheets, each sheet having a plane high thermal conductivity oriented along a first axis and a plane of lower thermal conductivity along a second axis different from the first axis. The stack has a three-dimensional shape including a length and a width where the length is longer than the width and the first axis aligns parallel to said length, the multilayer stack having a height less than the width. A plurality of bonding layers interspersed between each sheet of the multilayer stack, each bonding layer thermally coupling each sheet to a respective adjacent sheet. The bonding layers may comprise metal layers or adhesive layers.

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1. An apparatus comprising: a wearable device, including:electronic components;a mounting structure including the electronic components; anda stack of graphite layers thermally coupled to the electronic components, each of the layers having a plane of high thermal conductivity oriented along a first

1. An apparatus comprising: a wearable device, including:electronic components;a mounting structure including the electronic components; anda stack of graphite layers thermally coupled to the electronic components, each of the layers having a plane of high thermal conductivity oriented along a first axis and a lower thermal conductivity oriented along a second axis, the stack having a three-dimensional shape including a length and a width where the length is longer than the width and the first axis is parallel to said length, the stack having a height less than the width, an outer layer of the stack of graphite layers bounded to an exterior surface of the mounting structure such that the length extends away from the electronic components. 2. The apparatus of claim 1 wherein the stack of graphite layers is comprised of a plurality of sheets of pyrolytic graphite. 3. The apparatus of claim 2 wherein the mounting structure includes an arm extending in a direction away from the electronic components, and the stack is bonded to the arm. 4. The apparatus of claim 3 wherein the stack of graphite layers comprises a plurality of graphite sheets and a plurality of bonding layers interspersed between the graphite sheets, each one of the bonding layers comprising a metal. 5. The apparatus of claim 3 wherein the stack of graphite layers comprises a plurality of graphite sheets and a plurality of bonding layers interspersed between the graphite sheets, each one of the bonding layers comprising an adhesive. 6. The apparatus of claim 3 wherein the mounting structure is comprised of a material including a plurality of carbon nanoparticles. 7. A head mounted display including heat producing electrical components operating a display optical system, comprising: an optical mounting structure including the heat producing electrical components, the optical mounting structure housing the display optical system coupled to the heat producing electrical components, and first and second temple arms extending away from the heat producing electrical components and the display optical system, the temple arms adapted to secure the optical mounting structure to a head of a wearer; anda bonded stack of graphite layers, the stack thermally bonded to at least the heat producing electrical components and the optical mounting structure, each of the graphite layers having a plane high thermal conductivity along a first axis and a lower thermal conductivity along a second axis, the stack having a three-dimensional shape including a length and a width where the length is longer than the width and the first axis aligns parallel to said length, the stack having a height less than the width. 8. The display of claim 7 wherein the bonded stack of graphite layers is comprised of a plurality of sheets of pyrolytic graphite. 9. The display of claim 8 wherein the bonded stack is embedded in a material formed into the optical mounting structure. 10. The display of claim 8 wherein the length is defined by a first end and a second end, the first end coupled to the heat producing electrical components, the second end extending away from the heat producing components and bonded to an exterior surface of the optical mounting structure. 11. The display of claim 8 wherein the stack of graphite layers comprises a plurality of graphite sheets and a plurality of bonding layers interspersed between the graphite sheets, each one of the bonding layers comprising a metal. 12. The display of claim 8 wherein the stack of graphite layers comprises a plurality of graphite sheets and a plurality of bonding layers interspersed between the graphite sheets, each one of the bonding layers comprising an adhesive.