Abstract: A reference microphone for detecting noise is located under a first duct. The noise is in the form of a first plane wave in the first duct. A speaker is located on a top of the first duct. Connected to an upper part of the first duct is a second duct including an error microphone. The first plane wave in the first duct passes through an acoustic path and reaches the second duct. The error microphone detects the sound, and the speaker outputs a second plane wave with an opposite phase for canceling the first plane wave.

Abstract: A reference microphone for detecting noise is located under a first duct. The noise is in the form of a first plane wave in the first duct. A speaker is located on a top of the first duct. Connected to an upper part of the first duct is a second duct including an error microphone. The first plane wave in the first duct passes through an acoustic path and reaches the second duct. The error microphone detects the sound, and the speaker outputs a second plane wave with an opposite phase for canceling the first plane wave.

Abstract: In a side wall portion of a rigid unit which forms a slide guide frame portion, a depressed portion is formed in one approximately half portion, a through hole is formed in the other approximately half portion, and a protrusion is provided adjacent to the through hole inside the substantially center portion. In the depressed portion, a shaft protruding toward the outside is provided in the substantially center portion, and a notch portion cut in a height direction of the rigid unit is formed from the substantially center portion of the depressed portion to one end portion of the side wall portion. Adjacent two rigid units are connected by a shaft which is inserted into the through hole from the inside, and one unit is freely rotated with respect to the other unit within a range in which the protrusion abuts on one end and the other end of the notch portion.

Abstract: In a side wall portion of a rigid unit which forms a slide guide frame portion, a depressed portion is formed in one approximately half portion, a through hole is formed in the other approximately half portion, and a protrusion is provided adjacent to the through hole inside the substantially center portion. In the depressed portion, a shaft protruding toward the outside is provided in the substantially center portion, and a notch portion cut in a height direction of the rigid unit is formed from the substantially center portion of the depressed portion to one end portion of the side wall portion. Adjacent two rigid units are connected by a shaft which is inserted into the through hole from the inside, and one unit is freely rotated with respect to the other unit within a range in which the protrusion abuts on one end and the other end of the notch portion.

Abstract: In a screen device, to provide a screen device in which a roller pipe includes a revolving shaft 5 on which a coil spring 6 is wound integrated therein, connected to a rotator 52 rotatably disposed with respect to a stator 51 connected to a lower end of the revolving shaft, and is rotatably stored in a housing frame, the stator includes a plurality of radially arranged claws 53, holding portions 57 arranged radially on a lower surface portion of a cap member 55 which is detachably disposed at a lower end of the housing frame corresponding to the claws of the stator are disposed, the holding portions each have a holding space 58 for receiving the claw in the interior thereof, the holding space is opened outward at one end on the side of receiving the claw and closed at the other end to allow adjustment of initial winding of a coil spring integrated in a roller pipe and superior in opening-and-closing operability of a screen and manner it is retracted.

Abstract: A screen device including first rigid units (24) which constitute an upper slide guide frame portion (15) and second rigid units (17) which constitute a lower slide guide frame portion (16). The upper slide guide frame portion and the lower slide guide frame portion are retractable into the interior of a screen mounting frame (10). Wall portions (18) of the first rigid units are fitted in between the side wall portions of the second rigid units, and the upper slide guide frame portion intersects the lower slide guide frame portion in the interior of the screen mounting frame. Connection of the first rigid units can be released at an arbitrary position in the interior of the screen mounting frame when adjusting the length of the screen device (1), and the upper slide guide frame portion can be taken out from the screen mounting frame, so that an adjustment of the length in the field of installation is facilitated.

Abstract: In a screen device, to provide a screen device in which a roller pipe includes a revolving shaft 5 on which a coil spring 6 is wound integrated therein, connected to a rotator 52 rotatably disposed with respect to a stator 51 connected to a lower end of the revolving shaft, and is rotatably stored in a housing frame, the stator includes a plurality of radially arranged claws 53, holding portions 57 arranged radially on a lower surface portion of a cap member 55 which is detachably disposed at a lower end of the housing frame corresponding to the claws of the stator are disposed, the holding portions each have a holding space 58 for receiving the claw in the interior thereof, the holding space is opened outward at one end on the side of receiving the claw and closed at the other end to allow adjustment of initial winding of a coil spring integrated in a roller pipe and superior in opening-and-closing operability of a screen and manner it is retracted.

Abstract: To provide a screen device which allows an easy length adjustment work configured in such a manner that when the size of first rigid units 24 which constitute an upper slide guide frame portion 15 is smaller than the size of second rigid units 17 which constitute a lower slide guide frame portion 16 and the upper slide guide frame portion and the lower slide guide frame portion are retracted in the interior of a screen mounting frame 10, side wall portions 18 of the first rigid units are fitted in between the side wall portions of the second rigid units, the upper slide guide frame portion intersects the lower slide guide frame portion in the interior of the screen mounting frame, connection of the first rigid units can be released at an arbitrary position in the interior of the screen mounting frame when adjusting the length of the screen device 1, and the upper slide guide frame portion can be taken out from the screen mounting frame, so that an adjustment of the length in the field of installation is facil

Abstract: A first substrate having a first electromagnetic noise sensor on its surface perpendicularly intersects with a second substrate having a second electromagnetic noise sensor on its surface, making up an integral structure. A first induced voltage value output from the first electromagnetic sensor at a position thereof directly before driving by a driving means is recorded, and a second induced voltage value output from the second electromagnetic noise sensor at a position thereof at a time of movement of the integral structure for only a predetermined distance by a driving means is recorded. Further, the first and second electromagnetic noise sensors are parallel connected at the position of movement, and a third induced voltage value output from a parallel connected electromagnetic noise sensor is also recorded. Based on the recorded first and second voltage values, an electromagnetic noise level in a vicinity of the integral substrate is determined.