Patent ID: 7341561

Claim:
A wrist-worn apparatus comprising: a body of the apparatus; and a band attached to the body of the apparatus for wearing the body of the apparatus on a user's wrist; wherein the body of the apparatus comprises: a pulsation sensing unit that includes a pulsation sensing fluid chamber which contains a fluid and which comprises a bottom that comes into contact with the user's wrist when the body of the apparatus is worn on the user's wrist, the fluid chamber having an outer wall which includes the bottom of the fluid chamber and which defines the fluid chamber, the outer wall comprising an elastically deformable member which is elastically deformed depending on pulsation of blood in blood vessels of the user's wrist, said pulsation being transmitted through the band from the user's wrist when the body of the apparatus is worn on the user's wrist to thereby change a fluid pressure within the fluid chamber; and a deformation preventing member provided on the bottom of the fluid chamber for preventing elastic deformation of the fluid chamber; wherein the deformable member includes a brim, and the body of the apparatus further comprises a case and a stop member that fixes the deformable member in a pressed state at the brim to the case, and wherein the brim comprises a first ring-like ridge abutting on the case and a second ring-like ridge abutting on the stop member.