Abstract: An abnormality detection system includes a measurement unit, a decision unit, an alarm unit, and storage units, and serves to detect the abnormality in a control characteristic value of a plurality of products manufactured on the same production line. The decision unit receives the control characteristic value stored in the storage unit, and decides whether an abnormality exists, based on that value. More specifically, the decision unit decides that the control characteristic value is abnormal when, with respect to m (m is a natural number) pieces of the products that are consecutively manufactured, an absolute value of a difference in control characteristic value between each of the products and another manufactured immediately before the former is equal to or less than a predetermined constant.

Abstract: In a method for detecting abnormal characteristic values of a plurality of products sequentially manufactured in the same manufacturing line, it is determined whether or not a successive-decrease (or increase) tendency has occurred in a plurality of sequentially-obtained characteristic values of the products. Also, it is determined whether or not at least a last one of the characteristic values is located within a control region narrower than an allowable region and outside a normal region narrower than the control region. Further, when the successive-decrease or increase tendency has occurred and the last characteristic value is located within the control region outside the normal region, an alarm state is detected.

Abstract: In a method for detecting abnormal characteristic values of at least three products sequentially manufactured in the same manufacturing line, it is determined whether or not a successively-alternate increase/decrease tendency has occurred in a plurality of sequentially-obtained characteristic values of the products. Also, it is determined whether or not at least one of the characteristic values is located within a control region narrower than an allowable region and outside a normal region narrower than the control region. Further, when the successively-alternate increase/decrease tendency has occurred and the at least one characteristic value is located within the control region outside the normal region, an alarm state is detected.

Abstract: An abnormality detection system includes a measurement unit, a decision unit, an alarm unit, and storage units, and serves to detect the abnormality in a control characteristic value of a plurality of products manufactured on the same production line. The decision unit receives the control characteristic value stored in the storage unit, and decides whether an abnormality exists, based on that value. More specifically, the decision unit decides that the control characteristic value is abnormal when, with respect to m (m is a natural number) pieces of the products that are consecutively manufactured, an absolute value of a difference in control characteristic value between each of the products and another manufactured immediately before the former is equal to or less than a predetermined constant.

Abstract: In a method for detecting abnormal characteristic values of at least three products sequentially manufactured in the same manufacturing line, it is determined whether or not a successively-alternate increase/decrease tendency has occurred in a plurality of sequentially-obtained characteristic values of the products. Also, it is determined whether or not at least one of the characteristic values is located within a control region narrower than an allowable region and outside a normal region narrower than the control region. Further, when the successively-alternate increase/decrease tendency has occurred and the at least one characteristic value is located within the control region outside the normal region, an alarm state is detected.

Abstract: In a method for detecting abnormal characteristic values of a plurality of products sequentially manufactured in the same manufacturing line, it is determined whether or not a successive lower or upper tendency with respect to a control center value has occurred in a plurality of sequentially-obtained characteristic values of the products. Also, it is determined whether or not at least one of the characteristic values is located within a control region narrower than an allowable region and outside a normal region narrower than the control region. Further, when the successive lower or upper tendency has occurred and the at least one characteristic value is located within the control region outside the normal region, an alarm state is detected.

Abstract: In a method for detecting abnormal characteristic values of a plurality of products sequentially manufactured in the same manufacturing line, it is determined whether or not a successive-decrease (or increase) tendency has occurred in a plurality of sequentially-obtained characteristic values of the products. Also, it is determined whether or not at least a last one of the characteristic values is located within a control region narrower than an allowable region and outside a normal region narrower than the control region. Further, when the successive-decrease tendency has occurred and the last characteristic value is located within the control region outside the normal region, an alarm state is detected.