Method of detecting presence of subject on bed

A bed occupancy state detection apparatus, comprising:

• first to fourth load detection means 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 platforms, respectively;
• wherein load values outputted from the first to fourth load detection means are defined as W1, W2, W3, and W4, respectively,
• first judgment means for judging whether or not a first judgment formula (1) is satisfied, wherein the first judgment formula (1) is given by W1/(W1+W3) <n1, where 0<n1<0.5 (n1:
• previously set value);
• second judgment means for judging whether or not a second judgment formula (2) is satisfied, wherein the second judgment formula (2) is given by W1/(W1+W3) ≧n2, where 0.5<n2<1 (n2:
• previously set value);
• fourth judgment means for judging whether or not a fourth judgment formula (4) is satisfied, wherein the fourth judgment formula (4) is given by W2/(W2+W4)>n4, where 0.5<n4<1 (n4:
• previously set value);
• fifth judgment means for judging whether or not a fifth judgment formula (5) is satisfied, wherein the fifth judgment formula (5) is given by W1/(W1+W2) <n5, where 0<n5<0.5 (n5:
• previously set value);
• sixth judgment means for judging whether or not a sixth judgment formula (6) is satisfied, wherein the sixth judgment formula (6) is given by W1/(W1+W2) ≧n6, where 0.5 <n6<1 (n6:
• previously set value);
• seventh judgment means for judging whether or not a seventh judgment formula (7) is satisfied, wherein the seventh judgment formula (7) is given by W3/(W3+W4) ≦n7, where 0<n7<0.5 (n7:
• previously set value);
• eighth judgment means for judging whether or not an eighth judgment formula (8) is satisfied, wherein the eighth judgment formula (8) is given by W3/(W3+W4) ≧n8, where 0.5<n8<1 (n8:
• previously set value);
• and
• first notification means for notifying information on a bed occupancy state of an object in cases where it is judged that at least one judgment formula is satisfied from a judgment result of at least one judgment means among the first to eighth judgment means.

A bed occupancy state monitoring system, comprising:

• first to fourth load detection means 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, respectively;
• wherein load values outputted form the first to fourth load detection means are defined as W1, W2, W3, and W4, respectively,
• first judgment means for judging whether or not a first judgment formula (1) is satisfied, wherein the first judgment formula (1) is given by W1/(W1+W3) ≦n1, where 0<n1<0.5 (n1:
• previously set value);
• second judgment means for judging whether or not a second judgment formula (2) is satisfied, wherein the second judgment formula (2) is given by W1/(W1+W3) ≧n2, where 0.5<n2<1 (n2:
• previously set value);
• third judgment means for judging whether or not a third judgment formula (3) is satisfied, wherein the third judgment formula (3) is given by W2/(W2+W4) <n3, where 0<n3<0.5 (n3:
• previously set value);
• fourth judgment means for judging whether or not a fourth judgment formula (4) is satisfied, wherein the fourth judgment formula (4) is given by W2/(W2+W4)≧n4, where 0.5<n4<1 (n4:
• previously set value);
• fifth judgment means for judging whether or not a fifth judgment formula (5) is satisfied, wherein the fifth judgment formula (5) is given by W1/(W1+W2) ≦n5, where 0<n5<0.5 (n5:
• previously set value);
• sixth judgment means for judging whether or not a sixth judgment formula (6) is satisfied, wherein the sixth judgment formula (6) is given by W1/(W1+W2)≧n6, where 0.5 <n6<1 (n6:
• previously set value);
• seventh judgment means for judging whether or not a seventh judgment formula (7) is satisfied, wherein the seventh judgment formula (7) is given by W3/(W3+W4) ≦n7, where 0<n7<0.5 (n7:
• previously set value);
• eighth judgment means for judging whether or not an eighth judgment formula (8) is satisfied, wherein the eighth judgment formula (8) is given by W3/(W3+W4) ≧n8, where 0.5<n8<1 (n8:
• previously set value);
• and
• notification means for notifying information on a bed occupancy state of an object in cases where it is judged that at least one judgment formula is satisfied from a judgment result of at least one judgment means among the first to eighth judgment means.