Search

CN-224230803-U - Heat diffusion device and electronic apparatus

CN224230803UCN 224230803 UCN224230803 UCN 224230803UCN-224230803-U

Abstract

A heat diffusion device and an electronic apparatus exhibiting a large capillary force are provided. A soaking plate (1) as an embodiment of a heat diffusion device comprises a case (10) having a 1 st inner surface (11 a) and a 2 nd inner surface (12 a) which are opposed in a thickness direction (Z) and provided with an inner space, a working medium (20) enclosed in the inner space of the case, and a core (30) arranged in the inner space of the case. The core has a 1 st through hole (61), and a convex portion (65) approaching the 1 st inner surface of the housing in the thickness direction is provided on the periphery of the 1 st through hole. A gap (70) is provided between the tip end surface (65 a) of the protruding portion and the 1 st inner surface of the housing. The maximum interval in the thickness direction of the gap is smaller than the inner diameter of the 1 st through hole.

Inventors

  • MORIKAMI SEIO
  • Nagumoto

Assignees

  • 株式会社村田制作所

Dates

Publication Date
20260512
Application Date
20231128
Priority Date
20221207

Claims (10)

  1. 1. A heat diffusion device is characterized in that, The heat diffusion device includes: a housing having a 1 st inner surface and a 2 nd inner surface opposite in a thickness direction and provided with an inner space; a working medium enclosed in the internal space of the housing, and A core disposed in the inner space of the housing, The core has a1 st through hole, a convex portion which is close to the 1 st inner surface of the shell in the thickness direction is arranged on the periphery of the 1 st through hole, A gap is provided between the tip end surface of the convex portion and the 1 st inner surface of the housing, The maximum interval in the thickness direction of the gap is smaller than the inner diameter of the 1 st through hole.
  2. 2. A heat diffusion device according to claim 1, wherein, The convex portion has a convex-concave structure on a distal end surface thereof, so that the gap is provided between the distal end surface of the convex portion and the 1 st inner surface of the housing.
  3. 3. A heat diffusion device according to claim 1 or 2, wherein, The 1 st inner surface of the housing has a concave-convex structure, so that the gap is provided between the tip end surface of the convex portion and the 1 st inner surface of the housing.
  4. 4. A heat diffusion device according to claim 1 or 2, wherein, The core further includes a2 nd through hole, and no protruding portion is provided on a peripheral edge of the 2 nd through hole, which is close to the 1 st inner surface or the 2 nd inner surface of the housing in the thickness direction.
  5. 5. A heat diffusion device according to claim 1 or 2, wherein, The maximum interval in the thickness direction of the gap is 30 μm or less.
  6. 6. A heat diffusion device according to claim 1 or 2, wherein, The inner diameter of the 1 st through hole is 40 μm or less.
  7. 7. A heat diffusion device according to claim 1 or 2, wherein, The protrusion does not engage the 1 st inner surface of the housing.
  8. 8. A heat diffusion device according to claim 1 or 2, wherein, The distance between the outer walls of the convex portions becomes narrower toward the tip end surface of the convex portion.
  9. 9. A heat diffusion device according to claim 1 or 2, wherein, The distance between the outer walls of the convex portions is constant toward the tip end face of the convex portion.
  10. 10. An electronic device, characterized in that, The electronic device comprising the heat diffusion apparatus according to any one of claims 1 to 9.

Description

Heat diffusion device and electronic apparatus Technical Field The present utility model relates to a heat diffusion device and an electronic apparatus. Background In recent years, the amount of heat generated by the high integration and high performance of elements has increased. Further, since the heat generation density increases due to the miniaturization of products, a countermeasure against heat dissipation becomes important. This situation is particularly evident in the field of mobile terminals such as smartphones and tablet computers. As the heat countermeasure member, graphite sheets or the like are often used, but the heat transport amount thereof is insufficient, and thus various heat countermeasure members are being studied for use. Among them, as a heat diffusion device capable of diffusing heat very effectively, studies have been made on the use of a soaking plate as a planar heat pipe. The vapor chamber has a structure in which a working medium (also referred to as a working fluid) and a core for transporting the working medium by capillary force are enclosed in a casing. The working medium absorbs heat from the heat generating element in the evaporation unit that absorbs heat from the heat generating element such as an electronic component, evaporates in the vapor chamber, moves in the vapor chamber, and is cooled to return to the liquid phase. The working medium recovered to the liquid phase moves again to the evaporation portion on the heating element side by the capillary force of the core, and cools the heating element. By repeating this process, the soaking plate can operate autonomously without external power, and heat can be diffused at a high speed in two dimensions by utilizing the latent heat of evaporation and the latent heat of condensation of the working medium. Patent document 1 discloses a soaking plate including a housing including an upper housing piece and a lower housing piece joined at an outer edge portion thereof, the upper housing piece and the lower housing piece being opposed to each other, the soaking plate including an internal space, a working fluid enclosed in the internal space, a microchannel disposed in the internal space of the lower housing piece and constituting a flow path of the working fluid, and a sheet-shaped core disposed in the internal space of the housing and in contact with the microchannel, wherein a contact area between the core and the microchannel is 5% -40% of an area of the internal space in plan view. Prior art literature Patent literature Patent document 1 International publication No. 2021/229961 Disclosure of utility model Problems to be solved by the utility model Fig. 1 of patent document 1 shows a structure in which a core is sandwiched between a convex portion of a microchannel formed in a lower case sheet and a stay formed in an upper case sheet as an embodiment of a vapor chamber. Patent document 1 describes that the core has a plurality of fine holes and the holes are formed by etching, for example. The capillary force of the core is determined by the size of the diameter of the hole provided in the core. However, there is a limit to the reduction in diameter of the hole due to the limitation of the processing method such as etching. The above-described problems are not limited to the soaking plate, but are common to a heat diffusion device that can diffuse heat using the same structure as the soaking plate. The present utility model has been made to solve the above-described problems, and an object of the present utility model is to provide a heat diffusion device exhibiting a large capillary force. Moreover, the utility model also aims to provide an electronic device comprising the heat diffusion device. Solution for solving the problem The heat diffusion device of the present utility model includes a case having a 1 st inner surface and a 2 nd inner surface facing each other in a thickness direction and provided with an inner space, a working medium enclosed in the inner space of the case, and a core disposed in the inner space of the case. The core has a 1 st through hole, and a convex portion that is close to the 1 st inner surface of the housing in the thickness direction is provided at a periphery of the 1 st through hole. A gap is provided between the distal end surface of the protruding portion and the 1 st inner surface of the housing. The maximum interval in the thickness direction of the gap is smaller than the inner diameter of the 1 st through hole. Preferably, the convex portion has a convex-concave structure on a distal end surface thereof, so that the gap is provided between the distal end surface thereof and the 1 st inner surface of the housing. Preferably, the 1 st inner surface of the housing has a concave-convex structure, so that the gap is provided between the tip end surface of the convex portion and the 1 st inner surface of the housing. Preferably, the core further has a 2 nd through hole, and no protru