Abstract: The information provision device includes a detection part, a determination part, an extraction part, and a provision part. The determination part determines whether driving of the vehicle performed by a driver is a desirable action or an undesirable action with respect to a predetermined criterion on the basis of one or both of the behavior of the vehicle detected by the detection part and an image captured by an imaging part that images a surrounding situation of the vehicle. The extraction part extracts a first image in a first predetermined time before a first time at which the desirable action has been performed or a second image in a second predetermined time before a second time at 10 which the undesirable action has been performed out of images captured by the imaging part. The provision part provides content corresponding to a type of the action using the extracted image.

Abstract: A reproduction system includes an external detection unit configured to acquire external information of an own vehicle, a vehicle sensor configured to acquire vehicle information of the own vehicle, a storage medium storing computer-readable instructions, and at least one processor connected to the storage medium, the at least one processor executing the computer-readable instructions to generate external time-series data indicating an external situation of the own vehicle in time series based on the external information, generate vehicle time series data indicating a driving situation of the own vehicle in time series based on the vehicle information, generate, based on the external time-series data and the vehicle time-series data, a moving image that reproduces a movement history of the own vehicle at a specific traffic location, and cause a display device to display the moving image.

Abstract: A reproduction system includes an acquisition unit that acquires parameters related to a relative behavior of a host vehicle in a surrounding environment in a specific traffic section, a time-series parameter storage unit that stores the parameters in a time series as time-series parameter data, and a reproduced moving image generation unit having a focusing point specification unit that specifies focusing points in the specific traffic section, an extraction unit that extracts a group of focusing point parameters related to the focusing points from the time-series parameter data, a calculation unit that calculates feature points at the focusing points by statistically processing the group of focusing point parameters, and a moving image generation unit that generates a moving image for reproducing a movement history of the host vehicle in the specific traffic section on the basis of the feature points.

Abstract: A reproduction system includes an external detection unit configured to acquire external information of an own vehicle, a vehicle sensor configured to acquire vehicle information of the own vehicle, a storage medium storing computer-readable instructions, and at least one processor connected to the storage medium, the at least one processor executing the computer-readable instructions to generate external time-series data indicating an external situation of the own vehicle in time series based on the external information, generate vehicle time series data indicating a driving situation of the own vehicle in time series based on the vehicle information, generate, based on the external time-series data and the vehicle time-series data, a moving image that reproduces a movement history of the own vehicle at a specific traffic location, and cause a display device to display the moving image.

Abstract: An optical path rotating device, disposed in front of a linear array laser diode having a plurality of long and narrow and linearly arranged emitters for emitting a group of laser beams in the form of a dotted line, the optical path rotating device being able to convert the laser beams from the emitters into laser beams lined up in the form of ladder rungs by receiving the group of laser beams collimated by being refracted in a direction substantially perpendicular to the direction of the dotted line, rotating the positions of the laser beams from the emitters substantially for a right angle, and emitting the laser beams, and a laser apparatus, which uses the optical path rotating device, for collimating the substantially rung-shaped laser beams into two directions independently, bringing the laser means into focus, thus increasing the density of the laser energy at the focus.

Abstract: A track deviation detecting apparatus for detecting a deviation of a recording light spot (A) from a track (15) on a recording medium (7) comprises two diffraction gratings (2, 18) for producing two auxiliary spots (B1, C1) being led along light paths (30b1, 30c1), optical means comprising a light source (1), a collimator lens (17) and a condenser (6), and two optical detectors (20, 21) adapted to detect the respective reflected light rays from the auxiliary spots (B1, C1) on the recording medium (7). A positional relationship of two diffraction gratings (2, 18) and the optical means is arranged so that one of two auxiliary spots (B1, C1) is located on an unrecorded portion of the track (15) and at a lower edge (13) of the track (15), and the other is located on the unrecorded portion of the track (15) and at an upper edge of the track (15).