Abstract: A projection display device includes light source device including a plurality of lamp units; a plurality of lamp covers for covering a plurality of lamp apertures through which respective lamp units are taken in and out; a plurality of lamp power source units for driving respective lamp units; temperature switch for detecting the temperature of light source device; and main control unit. When at least one lamp unit is turned off during operation by opening of corresponding lamp cover, main control unit continues the operation. When at least one lamp unit is turned off during operation by temperature detection of temperature switch or abnormal operation of lamp power source unit, the main control unit stops the operation.

Abstract: A projection display device includes light source device including a plurality of lamp units; a plurality of lamp apertures disposed in main body cabinet such that the plurality of lamp units are replaced therethrough; a plurality of lamp covers for covering respective lamp apertures; four first detection switches for detecting opening and closing of respective lamp covers; and lamp control power source unit for supplying ballast control voltage signal to first detection switches. Four first detection switches are disposed on sub-circuit board. Sub-circuit board also includes conductive pattern for branching ballast control voltage signal input to first jack and leading the branched signal to first detection switches.

Abstract: A remote control signal receiver includes a plurality of signal reception units. Each signal reception unit includes a light reception window arranged in a housing of an electronic device and a light reception element arranged in the housing facing toward the light reception window. The light reception elements of the signal reception units are mounted on a circuit board. A transmission barrier prevents infrared noise entering the housing through the light reception window of one of the signal reception units from being transmitted to the light reception element of another one of the signal reception units.

Abstract: A video projector including a plurality of light sources is configured to project and display an image using light emitted from at least one of the light sources so that each light source is replaceable while other light sources are lit. The video projector includes a light source replacement detection unit that detects replacement of one or more light sources, a memory unit that stores information related to a combined lighting state of the light sources, and a control unit that changes the combined lighting state of the light sources when the replacement of at least one light source is detected without displaying, on the projected image, a setting screen used to change the combined lighting state.

Abstract: A projection display device includes light source device including a plurality of lamp units; a plurality of lamp covers for covering a plurality of lamp apertures through which respective lamp units are taken in and out; a plurality of lamp power source units for driving respective lamp units; temperature switch for detecting the temperature of light source device; and main control unit. When at least one lamp unit is turned off during operation by opening of corresponding lamp cover, main control unit continues the operation. When at least one lamp unit is turned off during operation by temperature detection of temperature switch or abnormal operation of lamp power source unit, the main control unit stops the operation.

Abstract: A projection display device includes light source device including a plurality of lamp units; a plurality of lamp apertures disposed in main body cabinet such that the plurality of lamp units are replaced therethrough; a plurality of lamp covers for covering respective lamp apertures; four first detection switches for detecting opening and closing of respective lamp covers; and lamp control power source unit for supplying ballast control voltage signal to first detection switches. Four first detection switches are disposed on sub-circuit board. Sub-circuit board also includes conductive pattern for branching ballast control voltage signal input to first jack and leading the branched signal to first detection switches.

Abstract: A structure for supporting a printed wiring board housed in a housing of an electronic device. The supporting structure includes a first projection formed on the housing and projecting toward the printed wiring board. The electronic device includes a conductor plate, which is grounded and accommodated in the housing. A second projection is formed on the conductor plate and projects toward the printed wiring board. The printed wiring board includes a substrate and a ground layer, which is arranged on the substrate. The first projection of the housing and the second projection of the conductor plate hold and support the printed wiring board in between and thereby electrically connect the ground layer to the conductor plate.

Abstract: An air filter device includes an air filter that removes dust from air drawn into a device. The air filter includes an air filter surface. A brush including bristles removes dust from the air filter. The brush and the air filter are relatively moved in a direction orthogonal to a longitudinal direction of the brush while distal parts of the bristles of the brush penetrate the air filter surface to remove dust from the air filter. A unit for reducing or eliminating penetration reduces or eliminates penetration of the brush into the air filter when relative movement of the brush and the air filter is stopped.

Abstract: A video projector including a plurality of light sources is configured to project and display an image using light emitted from at least one of the light sources so that each light source is replaceable while other light sources are lit. The video projector includes a light source replacement detection unit that detects replacement of one or more light sources, a memory unit that stores information related to a combined lighting state of the light sources, and a control unit that changes the combined lighting state of the light sources when the replacement of at least one light source is detected without displaying, on the projected image, a setting screen used to change the combined lighting state.

Abstract: A video projector including light source lamps and a cooling fan, which cools the light source lamps. A memory unit stores a reference time set for each of the light source lamps. The reference time indicates the time required for the corresponding light source lamp to be cooled, after being deactivated, to the reference temperature or less. A notification unit generates a notification for each of the light source lamps indicating that the light source lamp is replaceable. An elapsed time from when each of the light source lamps is switched from an activated state to a deactivated state is compared with a corresponding reference time. When the elapsed time exceeds the corresponding reference time, the notification unit generates the notification related to the corresponding light source lamp.

Abstract: A lamp operation device includes a mode setting part that sets an operation mode for lamps, and a lamp operation part that controls switching between the lamps in accordance with the set operation mode. The lamp operation part includes a process corresponding to a manual switching mode in which a lamp selected by a user is set as an illumination lamp, and a process corresponding to an automatic switching mode in which the plurality of lamps is automatically set in sequence as an illumination lamp. In the automatic switching mode, after one lamp has been set as the illumination lamp, cumulative illuminating time (amount of change) of the lamp is measured. Then, the illumination lamp is switched to the other lamp, depending on whether a measurement result has exceeded predetermined threshold time.

Abstract: An air filter coupled to an air inlet, which draws in air. The air filter is automatically cleaned to prevent clogging. When the supply of power is cut off during a cleaning operation sequence of the air filter and the electronic device restarts operation thereafter, the interrupted cleaning operation sequence is completed. An automatic cleaning operation may be performed on the air filter when a video projector, which serves as an electronic device, starts to operate. In addition, an automatic cleaning operation may he performed on the air filter when clogging of the air filter is detected.

Abstract: An electrical apparatus includes an air intake device which draws air into an apparatus body; a controller which controls the air intake device; a filter which removes unwanted matter from the air drawn into the apparatus body; and a removing device which removes the unwanted matter adhered to the filter. In this arrangement, the controller controls the air intake device to lower an air intake rate of the filter when the removing device is operated.

Abstract: An air filter device of a projector, which is an electronic device, includes an air filter and a brush. The air filter includes a cleaning region. The brush cleans the cleaning region while moving relative to the air filter. The cleaning region includes long sides and short sides extending in longitudinal and lateral directions, which are perpendicular to each other. The brush 55 extends along the long sides of the cleaning region.

Abstract: A cleaner, which automatically cleans an air filter, is coupled to an outer (upstream) side of a partition including an intake port. The air filter is coupled to the intake port through which air is drawn. The partition includes an opening used to electrically connect the cleaner to an inner (downstream) side. A substrate is coupled to the opening 42. A connector connected to the cleaner and a connector connected to an electrical system in a main body are arranged on the substrate. The two connectors are connected by a through hole at a peripheral section of the substrate.

Abstract: A projection display device includes: a projection portion which enlarges and projects the light modulated by a imager portion; a control circuit; and a main body cabinet. The projection portion is formed by a projection lens portion into which the light from the imager portion is entered and a mirror portion which reflects the light having passed through the projection lens portion and lets the light travel toward a projection plane. The mirror portion is disposed so as to be shifted from an optical axis of the projection lens portion in a direction opposite to a direction in which the incident light from the projection lens portion is turned back. The control circuit portion is disposed in a space which is produced between the projection lens portion and the main body cabinet by a position gap between the projection lens portion and the mirror portion.

Abstract: A video projector including replaceable light source lamps, a case that accommodates the light source lamps, lamp covers respectively corresponding to the light source lamps, a time measurement unit that measures an accumulated illumination time of each of the light source lamps, a control unit that determines whether or not the measured accumulated illumination time is greater than a replacement determination time, and notification units respectively corresponding to the light sources. Each notification unit is illuminated, when it is determined that the accumulated illumination time of the corresponding light source lamp is greater than the replacement determination time, to indicate where the corresponding lamp cover is located.

Abstract: A video projector includes a main body serving as a portable unit, which includes a projection optical unit that forms and projects a display image. The main body includes a rechargeable battery serving as a power supply. A holder holds the main body at a predetermined position. The holder includes a screen onto which is projected the display image from the main body held at the predetermined position. The holder is configured to charge the rechargeable battery when the main body is held in the holder.

Abstract: An electrical device includes a plurality of filters having filter performances different from each other; a filter switching section which switches a filter to be disposed in a channel of a fluid flowing into a main body of the device between the plurality of filters; a switching control section which controls the filter switching section; and a determining section which determines the type of unwanted matter contained in the fluid. In this arrangement, the switching control section controls the filter switching section to dispose the filter corresponding to the type determined by the determining section in the channel.

Abstract: A projection display device modulates light from a light source and projects the modulated light onto a projection plane. The projection display device includes a brightness detecting section that detects the brightness of a surrounding environment and a brightness notifying section that makes a notification in accordance with a result of detection by the brightness detecting section.