Abstract: When operation keys are operated, a light-emitting device outputs an infrared signal corresponding to the operated operation keys. The infrared signal is applied to a light-detecting device. In response to the applied infrared signal, the light-detecting device generates a detected signal and supplies the detected signal to an amplifying circuit. The amplified detected signal from the amplifying circuit is decoded by a decoding circuit into a data code, which is supplied through an interface circuit to a computer. Based on control data supplied as the data code to the computer, the computer controls a projector to perform a process of displaying images page by page, for example.

Abstract: A laser irradiation system includes a laser diode as a laser generation source, a lens for receiving the laser light introduced thereto from the laser diode and producing a laser beam, and a light pipe for receiving the laser beam produced by the lens and introduced thereto, wherein the light pipe has a hollow portion for guiding the introduced laser beam for irradiation therewith, and an outer tube portion for emitting light by scattering the introduced laser beam, whereby the irradiation with laser being conducted can be clearly indicated so that the user can easily notice the situation even in the cases of unintended irradiation with laser.

Abstract: When operation keys are operated, a light-emitting device outputs an infrared signal corresponding to the operated operation keys. The infrared signal is applied to a light-detecting device. In response to the applied infrared signal, the light-detecting device generates a detected signal and supplies the detected signal to an amplifying circuit. The amplified detected signal from the amplifying circuit is decoded by a decoding circuit into a data code, which is supplied through an interface circuit to a computer. Based on control data supplied as the data code to the computer, the computer controls a projector to perform a process of displaying images page by page, for example.

Abstract: An omnidirectional photodetector has a prism and a light-detecting device. The prism has a cylindrical columnar body and a conical member disposed on an end of the columnar body and having a cross-sectional area that is progressively smaller toward a tip end of the conical member. The prism is made of a light-transmissive synthetic resin. When the omnidirectional photodetector is in use, the conical member is positioned above the columnar body and has its axis oriented vertically. The conical member has a conical surface as an outer circumferential surface thereof providing a reflecting surface for reflecting a light beam applied from an external source to the conical surface into the columnar body and downwardly toward the lower end of the columnar body.

Abstract: A laser irradiation system includes a laser diode as a laser generation source, a lens for receiving the laser light introduced thereto from the laser diode and producing a laser beam, and a light pipe for receiving the laser beam produced by the lens and introduced thereto, wherein the light pipe has a hollow portion for guiding the introduced laser beam for irradiation therewith, and an outer tube portion for emitting light by scattering the introduced laser beam, whereby the irradiation with laser being conducted can be clearly indicated so that the user can easily notice the situation even in the cases of unintended irradiation with laser.

Abstract: A suspended line feed type planar antenna has a substrate sandwiched between a top plate and a bottom plate, in which a number of protrusions are formed on the top plate and the bottom plate at a plurality of corresponding positions by deforming the top plate and the bottom plate by means of a press-process or press-treatment, so that the substrate is supported by the protrusions.

Abstract: A suspended line feed type planar antenna is arranged with a number of antenna elements formed on a film-shaped substrate, and the film-shaped substrate is sandwiched between a plastic radome and a plastic rear cover, a conductive surface is plated on the rear surface of the plastic radome at its portion except the portions opposing the antenna elements and/or a conductive surface is plated on the whole front surface of the rear cover. The conductive surfaces and the antenna elements constitute resonance type printed path radiators, whereby the planar antenna of the invention can be simplified in construction and reduced in cost, thickness and weight, and the planar antenna of the invention can be increased in productivity and reliability.

Abstract: A planar microwave antenna of the suspended line feed type has a substrate sandwiched between a pair of conductive plates, each of the plates having aligned openings defining radiation elements. The substrate is held in place by holding portions surrounding the openings and wide grooves between the openings house a plurality of parallel suspended lines.