JPS61164380A - Camera system - Google Patents

Abstract

PURPOSE:To decrease the number of cables between a CCU section and a camera head section by applying constant current type pulse amplitude conversion to a control signal transmitted from the CCU section, applying time division multiplex to the result and transmitting it to a camera head section. CONSTITUTION:The titled system consists of a camera head section B a CCU section A controlling the camera head section B, the CCU section A is provided with pulse amplitude converting circuits 8-10 for a control signal of control signal generating circuits 1-3, and a pulse signal is multiplexed on a transmission cable 11 through time division. The transmitted pulse signal is converted into a DC signal by sample-and-hold circuit 12-14 at the camera head section B, sent to a signal processing circuit 7, where the signals are controlled. The plural control signals from the CCU section are multiplexed on one cable and the total cost as the camera system is decreased.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a camera system comprising a camera throat section and a CCU section for controlling the camera.

Conventional technology The control signals from the CCU section were controlled by direct current signals by providing dedicated cables for each control signal, as shown in FIG. 4, for example.

To explain its configuration with reference to FIG. 4, assuming that there are three types of signals necessary to control the camera head from the CCU section, 1, 2.3 are control signal generation circuits, respectively, and 4, 5° 6 are cables for transmitting the respective control signals mentioned above, and 7 is a signal processing circuit in the camera head section.

Problems to be Solved by the Invention Therefore, the conventional method described above requires cables only for control signals, and has the drawback that the more signals are exchanged between the CCU section and the camera head section, the more cables are required.

The present invention reduces the number of cables between the CCU section and the camera head section, and obtains a stable signal at the camera head section even if the length of the cable between the CCU section and the camera throat section is changed arbitrarily. It provides a camera system.

Means for Solving the Problems In order to achieve the above object, the present invention performs constant current pulse amplitude conversion on the signals that control the camera head from the CCU section, and time-divides each pulse signal into one cable. It is designed to be multiplexed and transmitted to the camera head.

Operation By using a constant current method for the pulse signal transmitted from the CCU section, the load on the camera head section is fixed, so that it can be stabilized regardless of the length between the CCU section and the camera head section.

Embodiment FIG. 1 shows the configuration of an embodiment of the present invention. In FIG. 1, A is a CCU section, and B is a camera head section. 1, 2.3 and 7 are control signal generation circuits and signal processing circuits as in FIG.

8.9.10 are control signal generation circuits 1, 2, respectively.
This is a pulse amplitude conversion circuit for control signals of No. 3, and pulse signals as shown in FIG. 2 are time-division multiplexed on the transmission cable 11. In Figure 2, a, b,
c is a pulse signal subjected to pulse amplitude conversion, and tI+
t2 is a time division interval. The pulse signal transmitted in this way is transmitted to camera head section B at 12, 1
3.14 sample and hold circuit allows (a) and (b) in Figure 3.

As shown in C→, it is converted into a DC signal and sent to the signal processing circuit 7, where it can be controlled individually. Since it can be multiplexed into multiple cameras, the total cost of the camera system is low and it is easy to construct. However, since the number of connectors used to connect cables can be reduced, the camera head can also be made smaller.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a camera system according to an embodiment of the present invention, FIGS. 2 and 3 are signal waveform diagrams of various parts in the present invention, and FIG. 4 is a block diagram of a conventional system. 1.2.3...Control signal generation circuit, 4,5゜6.11...Transmission cable, 7...Signal processing circuit,
8゜9.10...Pulse amplitude conversion circuit, 12.13.
14...Sample hold circuit. Name of agent: Patent attorney Toshio Nakao and 1 other person 2nd
Figure 3

Claims (1)

[Claims] Camera head section and C that controls the camera head section
The CCU section is provided with means for subjecting various control signals to constant current type pulse amplitude conversion, and time-division multiplexing and transmitting the above pulse amplitude converted signals on one cable. The camera system includes a sample hold circuit in the camera head section that converts the pulse amplitude-converted signal into a DC signal.