Abstract: A method for manufacturing a flat heat pipe with sectional differences includes following steps. First, form a plurality of grooves on an inner wall of a pipe body having one outer diameter. Subsequently, form a plurality of tubular sectional difference portions having various outer diameters on the pipe body. Then, degass an interior of the pipe body into vacuum and seal both ends thereof. Finally, press the respective sectional difference portions of the pipe body into flat.

Abstract: The present invention provides a flat heat pipe with sectional differences and a method for manufacturing the same. The heat pipe has a flat hollow pipe body. A working fluid is sealed in the pipe body. The pipe body is provided along its length with a plurality of flat sectional difference portions having different widths. A connecting portion is formed between the sectional difference portions. The inner wall of the pipe body is formed with a plurality of grooves. The pitch between the grooves in the sectional difference portion of a relatively large width is larger than the pitch between the grooves in the sectional difference portion of a relatively small width.