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Spring-loaded Thermocouple to measure CPU Case Temperature Disclosure Number: IPCOM000016400D
Original Publication Date: 2002-Nov-01
Included in the Prior Art Database: 2003-Jun-21

Publishing Venue



The Spring-loaded Thermocouple compresses when heatsink is secured to the CPU with a clip. This ensures that the heatsink is sitting flat on the CPU when temperature measurements are taken as shown in Figure 1. This is critical because heat exchange between CPU and heatsink depends on the area of contact and flatness. The design of the Spring-loaded Thermocouple is as shown in Figure 2. It has a M4 screw thread on the external surface and a spring-loaded ball bearing embedded with a thermocouple wire. The tip of the thermocouple is the point where temperature is being measured on the CPU. To mount the Spring-loaded Thermocouple, heatsink needs to be drilled with diameter 3.3mm and follow by a M4 tap. The advantages with this invention are: 1) Thermocouple is always in contact with the CPU surface 2) Achieve more accurate temperature measurement