Patent ID: 8279057

Claim:
A bed occupancy state detection method, comprising: a load detection step for detecting loads applied to a head side right portion, a head side left portion, a foot side right portion, and a foot side left portion of a bed platform by first to fourth load detection means, respectively; wherein load values outputted from the first to fourth load detection means are defined as W 1 , W 2 , W 3 , and W 4 , respectively, a first judgment step for judging whether or not a first judgment formula (1) is satisfied, wherein the first judgment formula (1) is given by W 1 /(W 1 +W 3 )≦n 1 , where 0<n 1 <0.5 (n 1 : previously set value); a second judgment step for judging whether or not a second judgment formula (2) is satisfied, wherein the second judgment formula (2) is given by W 1 /(W 1 +W 3 )≧n 2 , where 0.5<n 2 <1 (n 2 : previously set value); a third judgment step for judging whether or not a third judgment formula (3) is satisfied, wherein the third judgment formula (3) is given by W 2 /(W 2 +W 4 )≦n 3 , where 0<n 3 <0.5 (n 3 : previously set value); a fourth judgment step for judging whether or not a fourth judgment formula (4) is satisfied, wherein the fourth judgment formula (4) is given by W 2 /(W 2 +W 4 )≧n 4 , where 0.5<n 4 <1(n 4 : previously set value); a fifth judgment step for judging whether or not a fifth judgment formula (5) is satisfied, wherein the fifth judgment formula (5) is given by W 1 /(W 1 +W 2 )≦n 5 , where 0<n 5 <0.5 (n 5 : previously set value); a sixth judgment step for judging whether or not a sixth judgment formula (6) is satisfied, wherein the sixth judgment formula (6) is given by W 1 /(W 1 +W 2 )≧n 6 , where 0.5 <n 6 <1 (n 6 : previously set value); a seventh judgment step for judging whether or not a seventh judgment formula (7) is satisfied, wherein the seventh judgment formula (7) is given by W 3 /(W 3 +W 4 )≦n 7 , where 0<n 7 <0.5 (n 7 : previously set value); an eighth judgment step for judging whether or not an eighth judgment formula (8) is satisfied, wherein the eighth judgment formula (8) is given by W 3 /(W 3 +W 4 )≧n 8 , where 0.5<n 8 <1 (n 8 : previously set value); and a first notification step for notifying information on a bed occupancy state of an object when it is judged that at least one judgment formula is satisfied from a judgment result of at least one judgment step among the first to eighth judgment steps.