Panasonic Corporation

Panasonic Intellectual Property Management Co., Ltd.

Takahiro Takemori

Masutaka Inoue

Kensuke Nagauchi

Kazuo Mukai

A projection-type image display device includes a first housing and a second housing. The first housing houses a light source unit configured to emit light, an image generating unit configured to modulate the light from the light source unit according to a video input signal to generate image light, and a projecting unit configured to project the image light generated by the image generating unit. The second housing includes an output unit configured to output a light signal and/or an input unit configured to input a light signal which are/is exposed and arranged on a surface of the second housing.

Projection-type image display device

In a discharge lamp ignition apparatus, a control circuit unit: lowers a drive frequency from a predetermined initial frequency; establishing, if a resonant voltage reaches an ignition voltage for igniting a discharge lamp, a drive frequency at the ignition voltage as a discharge-lamp-ignition drive frequency which is a frequency for igniting the discharge lamp; and sets, if the resonant voltage does not reach the ignition voltage even though the drive frequency is lowered from the predetermined initial frequency to a resonant frequency, a frequency which is a predetermined value higher than the drive frequency at a resonant voltage peak voltage as the discharge-lamp-ignition drive frequency, and an inverter circuit unit alternating-current drives the resonant circuit unit at the discharge-lamp-ignition drive frequency established by the control circuit unit.

Growing community of inventors

Osaka, Japan

Takahiro Takemori