초록 ▼

A directly actuated electric valve is proposed that has a piezoelectric drive unit (3) for direct actuation of a valve member (2). The piezoelectric drive unit (3) contains, extending transverse to the displacement direction of valve member (2), at least one piezo-flexural element (8, 8'), which act

A directly actuated electric valve is proposed that has a piezoelectric drive unit (3) for direct actuation of a valve member (2). The piezoelectric drive unit (3) contains, extending transverse to the displacement direction of valve member (2), at least one piezo-flexural element (8, 8'), which acts on valve member (2) at one end and is mounted stationary with respect to the housing at the other, such that its electrically induced flexural motion produces the linear displacement motion of valve member (2). Such a configuration permits very short switching times with compact dimensions.

대표청구항 ▼

A directly actuated electric valve is proposed that has a piezoelectric drive unit (3) for direct actuation of a valve member (2). The piezoelectric drive unit (3) contains, extending transverse to the displacement direction of valve member (2), at least one piezo-flexural element (8, 8'), which act

A directly actuated electric valve is proposed that has a piezoelectric drive unit (3) for direct actuation of a valve member (2). The piezoelectric drive unit (3) contains, extending transverse to the displacement direction of valve member (2), at least one piezo-flexural element (8, 8'), which acts on valve member (2) at one end and is mounted stationary with respect to the housing at the other, such that its electrically induced flexural motion produces the linear displacement motion of valve member (2). Such a configuration permits very short switching times with compact dimensions. ording to claim 24 and wherein said at least partially transparent intermediate layer is located with respect to said display and said housing so as to substantially eliminate air gaps therebetween. 28. An electronic shelf label comprising: a housing; an electrically driven display mounted in said housing; a data communicator providing display data to said electrically driven display from an external data source; at least one fuel cell powering said electrically driven display, said at least one fuel cell including a fuel tank, filling generally the volume of said housing not occupied by said display and said data communicator; and at least one receiver receiving IR transmissions including: an IR sensor; a non-IR visible light sensor; and circuitry for employing an output of the non-IR visible light sensor for reducing interference in a signal band sensed by said IR sensor. 29. An electronic shelf label according to claim 28 and also comprising at least one electrically powered illuminator, and wherein said at least one electrically powered illuminator and said electrically driven display have an average lifetime without requiring repowering of at least six months. 30. An electronic shelf label according to claim 28 and wherein said at least one fuel cell has an average mean power output of less than approximately 50 microwatts. 31. An