Seiko Epson Corporation

Daisuke Yanagihara

Shinichi Wakabayashi

Takeshi Furihata

Akira Nemura

Takao Hirakura

Kazunori Maeta

Nozomi Fujishige

An optical path shifting device includes: a holding frame holding a rectangular glass plate; a support part supporting the holding frame in a swingable state; an actuator causing the holding frame to swing; a magnetic sensor detecting a position of the holding frame; and a thermistor detecting a temperature of the magnetic sensor. A drive signal processing circuit includes: an amplifier amplifying a reference signal to generate a drive signal and supplying the drive signal to the actuator; and a signal processing unit inputting the reference signal and an amplifier gain to the amplifier. The signal processing unit performs gain adjustment processing to correct an amplitude value found from an output from the magnetic sensor, based on an output from the thermistor, and to adjust the amplifier gain, based on a corrected value.

Optical path shifting device, image display device, and method for controlling optical path shifting device

A method for controlling an optical device including a movable section including an optical section that refracts incident video image light in accordance with the angle of incidence of the video image light and outputs the refracted video image light and a holding section that supports the optical section, an actuator that causes the movable section to swing, and a drive circuit that applies a drive signal to the actuator via a coupling capacitor and an amplifier, the method including applying voltage that is intermediate potential for a first period and then applying a trapezoidal wave having an upper base corresponding to second voltage and a lower base corresponding to third voltage.

Optical device, method for controlling optical device, and image display apparatus

A projector including a light source, a power supply section, a power supply control section that controls power supply from the power supply section, a projection lens that projects an image, and a projection system driver that moves the projection lens, wherein the power supply control section performs, as power supply modes, an operation mode in which power is supplied to the light source section to allow the light source section to output light and a first standby mode in which the power supply to the light source section is terminated, and in the first standby mode, power is supplied to the projection system driver to allow the projection lens to move to an attachment/detachment position where the projection lens is attachable and detachable.

Growing community of inventors

Matsumoto, Japan

Daisuke Yanagihara