Abstract: An electromagnetic wave detection apparatus 10 includes a separator 16, a first detector 17, a switching unit 18, and a second detector 20. The separator 16 is capable of switching between a separation state and a non-separation state. The separator 16 separates incident electromagnetic waves to travel in a first direction d1 and a second direction d2, in the separation state. The first detector 17 detects electromagnetic waves traveling in the first direction d1. The switching unit 18 includes a plurality of switching elements “se”. Each switching element “se” is capable of switching a traveling direction of electromagnetic waves traveling in the second direction d2 between a third direction d3 and a fourth direction d4. The second detector 20 detects electromagnetic waves traveling in the third direction d3.

Abstract: An electromagnetic wave detection apparatus (10) includes a separation unit (16), a first detector (17), a switch (18), and a second detector (20). The separation unit (16) separates incident electromagnetic waves so that the electromagnetic waves propagate in a first direction (d1) and a second direction (d2). The first detector (17) detects the electromagnetic waves that propagate in the first direction (d1). The switch (18) includes a plurality of switching elements (se). The switching elements (se) are capable of switching the propagation direction of the electromagnetic waves that propagate in the second direction (d2) to a third direction (d3) and a fourth direction (d4). The second detector (20) detects the electromagnetic waves that propagate in the third direction (d3).

Abstract: An electromagnetic wave detection apparatus (10) includes an irradiator (11), a first detector (17), a propagation unit (20), a memory (13), and a controller (14). The irradiator (11) irradiates electromagnetic waves. The first detector (17) detects reflected waves of the electromagnetic waves irradiated onto an object (ob). The propagation unit (20) includes propagation elements (px). By irradiation position of the electromagnetic waves irradiated onto the object (ob), the propagation elements (px) switch between propagating and not propagating the reflected waves towards the first detector (17). The memory (13) stores information related to the emission direction of the electromagnetic waves. The controller (14) updates the information related to the emission direction based on the position of the propagation element (px) that is propagating the reflected waves toward the first detector (17) when the first detector (17) detects the reflected waves.

Abstract: An electromagnetic wave detection apparatus (10) includes a detector (17), a propagation unit (15), and a controller (13). The detector (17) includes a first detection element (21). The first detection element (21) detects electromagnetic waves. The propagation unit (15) includes a first propagation element group (18). The first propagation element group (18) includes a plurality of propagation elements (20). The propagation elements (20) switch between allowing and not allowing propagation of incident electromagnetic waves towards the first detection element (21). The controller (13) is capable of controlling switching of each propagation element (20) between allowing and not allowing the propagation. The controller (13) sequentially causes different propagation elements (20) to switch between allowing and not allowing the propagation.

Abstract: An electromagnetic wave detection apparatus (10) includes an irradiator (11), a first detector (17), a propagation unit (20), a memory (13), and a controller (14). The irradiator (11) irradiates electromagnetic waves. The first detector (17) detects reflected waves of the electromagnetic waves irradiated onto an object (ob). The propagation unit (20) includes propagation elements (px). By irradiation position of the electromagnetic waves irradiated onto the object (ob), the propagation elements (px) switch between propagating and not propagating the reflected waves of the electromagnetic waves towards the first detector (17). The memory (13) stores related information. The controller (14) updates the related information based on the position of the propagation element (px) that is propagating the reflected waves toward the first detector (17) when the first detector (17) detects the reflected waves.

Abstract: An electromagnetic wave detection apparatus (10) includes an irradiator (11), a first detector (17), a memory (13), and a controller (14). The irradiator (11) irradiates electromagnetic waves. The first detector (17) includes detection elements. The detection elements detect, by irradiation position, reflected waves of the electromagnetic waves irradiated onto an object (ob). The memory (13) stores related information. The related information is information associating any two of the emission direction of the electromagnetic waves and elements defining two points on a path. The path refers to a path of the electromagnetic waves emitted from the irradiator (11) to the first detector (17) via the object (ob). The controller (14) updates the related information based on the emission direction of the electromagnetic waves and the position of the detection element, among the detection elements, that detects the reflected waves of the electromagnetic waves.

Abstract: An electromagnetic wave detection apparatus (10) includes a switch (16), a first detector (19), and a second detector (20). The switch (16) includes an action surface (as) with a plurality of pixels (px) disposed thereon. The switch (16) is configured to switch each pixel (px) between the first state and the second state. In the first state, the pixels (px) cause electromagnetic waves incident on the action surface (as) to travel in a first direction (dl). In the second state, the pixels (px) cause the electromagnetic waves incident on the action surface (as) to travel in a second direction (d2). The first detector (19) detects the electromagnetic waves that travel in the first direction (dl). The second detector (20) detects the electromagnetic waves that travel in the second direction (d2).

Abstract: A sheet conveying device includes a detector configured to detect an attitude of a conveyance target medium, a corrector configured to perform a correcting operation based on a detection result of the detector, and circuitry configured to calculate an angular displacement correction amount and a lateral displacement correction amount of the conveyance target medium, cause the corrector to perform the correcting operation in a direction perpendicular to a sheet conveying direction, based on the lateral displacement correction amount, after the corrector grips the conveyance target medium, and cause the corrector to rotate by the angular displacement correction amount of the conveyance target medium before the corrector grips the conveyance target medium and to perform the correcting operation in a direction of rotation of the conveyance target medium, based on the angular displacement correction amount, after the corrector grips the conveyance target medium.

Abstract: A display apparatus includes an image projector and a controller. The image projector emits image projection light that projects an image onto a projection-target surface. The controller controls, in a time division manner, the emission direction of the image projection light emitted by the image projector. The controller performs control to prevent the sum of the area of one or more regions of the projection-target surface, on which the image projection light is projected, from exceeding a predetermined upper limit.