Seiko Epson Corporation

Kenichi Shioiri

Masahide Tsuda

Osamu Saito

Shigehiro Yanase

Keishi Kimura

A projector according to an embodiment of the invention can measure the temperature of an object to be cooled accurately with a simple configuration and perform accurate cooling control. The projector includes a power-supply unit, a ballast unit having a ballast control circuit and a photocoupler, and a control unit. The power-supply unit includes a temperature detection element generating temperature information indicating the temperature inside the power-supply unit. The ballast control circuit controls a constant-current control circuit and the like based on the control information transmitted from the control unit via the photocoupler and transmits temperature data based on the temperature information to the control unit via the photocoupler. The control unit includes a projector control circuit performing cooling control on the power-supply unit based on the temperature data.

Method for controlling a projector including a cooling unit insulated from a power-supply unit

A projector includes a light source that emits excitation light, a fluorescent body that converts the excitation light into fluorescence, a liquid crystal optical modulation device that modulates light output from the fluorescent body, an optical sensor that detects at least one of the excitation light passing through the fluorescent body and the fluorescence converted by the fluorescent body, and a control device that controls at least one of the light source and the liquid crystal optical modulation device based on a detection result of the optical sensor.

Projector having fluorescent body and associated sensor

Projector having fluoroscent body and associated sensor

A light source control device is for controlling a solid-state light source array having a plurality of solid-state light sources connected in series to each other, and includes a detector (a current detection resistor, voltage detection resistors, and operational amplifiers) adapted to detect at least one of a voltage applied to the solid-state light source array and a current supplied to the solid-state light source array, and a control circuit adapted to determine whether or not discontinuity of at least one of the voltage and the current is present using a detection result of the detector, and change control of one of the current and electrical power performed on the solid-state light source array if it is determined that the discontinuity is present.

Light source control device and projector

A projection-type display device according to an embodiment of the invention modulates light emitted from a solid-state light source array and projects the modulated light on a screen. The projection-type display device includes a power source device that generates power used for driving the solid-state light source array using power supplied from a power source, an instant interruption detecting circuit that detects an instant interruption of the power source, and a control device that, in a case where the instant interruption of the power source is detected by the instant interruption detecting circuit, performs control of extinguishing the solid-state light source array during at least a part of an instant interruption period until recovery after the detection of the instant interruption of the power source.

Projection-type display device and method of controlling thereof

A switching power supply includes: a coil; and a pedestal fixed to the coil, the pedestal includes a supporting member configured to support the coil in such a manner as to form a space through which air flows on a surface of the coil attached to the pedestal.

Growing community of inventors

Matsumoto, Japan

Kenichi Shioiri