Abstract: An observation device includes a microscope. The microscope includes an illumination light beam source, an illumination optical system, and an observation optical system forming an optical image of an observation target from reflected light beams obtained by reflection of illumination light beams by the observation target. The observation optical system includes a phase plate changing the phase of directly reflected light beams reflected on a reflection surface among the reflected light beams. Both the illumination optical system and the observation optical system are arranged under the observation target. The observation device includes an image pickup device photoelectrically converting the optical image obtained by the observation optical system to create image data of the observation target and a display device displaying the image data. The illumination light beam emitted from the illumination optical system is a collimated light beam.

Abstract: A vehicle approach alert device includes: a memory memorizing a warning sound source data for emitting a warning sound from an external sound emitting unit and a canceling sound source data for emitting a canceling sound from an internal sound emitting unit. The canceling sound cancels the warning sound transmitted from the external sound emitting unit to inside of the vehicle. The vehicle approach alert device further includes: a control part configured to read the warning sound source data from the memory to cause the external sound emitting unit to emit the warning sound based on the warning sound source data, and to read the canceling sound source data from the memory to cause the internal sound emitting unit to emit the canceling sound based on the canceling sound source data to be synchronized with the warning sound.

Abstract: A vehicle approach alert device includes: a memory memorizing a warning sound source data for emitting a warning sound from an external sound emitting unit and a canceling sound source data for emitting a canceling sound from an internal sound emitting unit. The canceling sound cancels the warning sound transmitted from the external sound emitting unit to inside of the vehicle. The vehicle approach alert device further includes: a control part configured to read the warning sound source data from the memory to cause the external sound emitting unit to emit the warning sound based on the warning sound source data, and to read the canceling sound source data from the memory to cause the internal sound emitting unit to emit the canceling sound based on the canceling sound source data to be synchronized with the warning sound.

Abstract: An electrical circuit device includes a controller, drivers, and a case. The controller inputs driving signals to the drivers. The drivers have multiple semiconductor relays that turn on and off power supply to electrical loads based on the driving signals. The drivers are housed in the case. The driving signals are transmitted from the controller to the drivers via serial communication. With this configuration, the number of communication lines and the communication connectors and the size of the electrical circuit device are small with respect to parallel communication. When another driver is added, only software modification of the controller and addition of a serial communication line between the controller and the driver are required. Thus, the electrical circuit device can be easily modified for different models of vehicles.