Abstract: An optical device includes a rotary member. A rotary member is rotated across a first angle range and a second angle range lined up in a direction in which an angle is increased. An activator activates a power source when a rotation angle of the rotary member is increased to a first specific angle belonging to the first angle range. An adjuster adjusts a setting of an optical system with reference to a rotation of the rotary member in the second angle range. A notifier generates a notification when the rotation angle of the rotary member remains within the first angle range in a state where the power source is activated.

Abstract: A monitoring camera system including a plurality of monitoring cameras, a plurality of monitors, a multiplexer for switching a connection between the monitoring camera and the monitor, and a plurality of controllers for remotely controlling the monitoring cameras through a communication control line. Each of the controllers remotely control the monitoring cameras by sending to the communication control line a command including an address assigned to the monitoring camera which is a control object and the contents of control. In controlling a monitoring camera providing video to a predetermined monitor, a controller sends a number of the predetermined monitor to the multiplexer, and inquires of the multiplexer about the address assigned to the monitoring camera providing the video to the predetermined monitor. The multiplexer transmits the address assigned to the monitoring camera providing the video to the predetermined monitor to the controller that is a source of the inquiry.

Abstract: A surveillance camera system includes a multiplexer. A camera switch circuit provided on the multiplexer selects each of a plurality of surveillance cameras in a time-division manner. An image processing circuit included in the multiplexer fetches a photographed image signal output from a selected surveillance camera, and adds VBI information having a recording bit of “1” to the photographed image signal at a timing according to a recording mode setting. An HDR recodes the photographed image signal in a hard disk when the recording bit included in the VBI information is “1”.

Abstract: A timer reservation device has a reservation data store section, a reservation history store section and a clock section. The reservation data store section stores recording reservation dataset for reservation. The reservation history store section stores recording reservation data concerning recording which was executed. The clock section outputs present month and day, time, and ay of the week data. The day of the week data of the recording reservation data in the reservation history store section is compared with the day of the week data from the clock section. Month and day data of the recording reservation data is changed to be stored in said reservation data store section.

Abstract: Disclosed is a communication method in a communication system in which a communication device is connected to a camera through a control bus based on RS-485, a first coaxial conversion device, a video signal transmission cable, and a second coaxial conversion device, the first coaxial conversion device comprising the function of superimposing communication data from the communication device to the camera on a vertical blanking period of a video signal on the video signal transmission cable and the function of extracting communication data from the camera to the communication device which is superimposed on the video signal on the video signal transmission cable to transmit the extracted communication data to the control bus based on RS-485, and the second coaxial conversion device comprising the function of superimposing communication data from the camera to the communication device on a vertical blanking period of a video signal on the video signal transmission cable and the function of extracting communicat