JPS6130943B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a television camera in which a television camera such as a television for checking the rear of a vehicle is connected to a monitor using a multi-core cable, and deflection current, low voltage and high voltage power, etc. of the television camera are supplied from the monitor section. The present invention relates to a system in which the monitor receives a composite video signal having a synchronization signal in addition to the television camera signal. Recently, fares on buses are displayed on a black and white monitor in the driver's seat and a color monitor in the passenger seat.
There has been a growing demand for a system that can be used in conjunction with a VTR to perform various guidance services. This is because the conventional fare display method does not allow you to easily change the displayed content, making it impossible to dispatch buses to different routes, and when revising fares, it takes a lot of money and time to change the display. It was because it was hot. However, the system shown in FIG. 1, for example, allows various guidance services and fare displays, and the status of passengers at the boarding gate can be confirmed using a boarding camera for safety confirmation.
That is, in FIG. 1, reference numeral 1 denotes a black-and-white monitor television installed in the driver's seat, and the image is received by switching between the signal from the entrance camera 5 and the fare display signal generator 7 by means of a changeover switch 3 via a changeover adapter 2. can. 9 is a remote control VTR, 10
is a remote control switch for starting the VTR, and when the remote control switch 10 is pressed, the VTR 9 starts, and the video and audio information is played on the color monitor television 11 in the passenger seat and on the in-car broadcast. When the guidance is finished, the price is automatically displayed on the monitor televisions 1 and 11. The charge contents of the charge display signal generator 7 can be easily changed by replacing the memory section which is now a pack type. Note that 4 and 8 are multicore cables, and 6 is a coaxial cable. Now, the part surrounded by the dotted line in Figure 1 is a black and white monitor, which is used as a fare display monitor for the driver, and also as a boarding gate camera 5 for safety confirmation at the boarding gate at the rear of the vehicle.
However, in a one-man bus, there are various operation switches, and it is a burden on the driver to switch and check the switch 3 while driving, which is not preferable. In such a system, the present invention is configured to receive either the video signal of the entrance camera for safety confirmation or the fare display signal when the front door or the rear door is open or closed, and the switching is performed completely. This paper proposes a camera system that is automatic and does not require any operation by the driver. An embodiment of the present invention will be described below based on the drawings. FIG. 2 shows an example of the structure of the dotted line portion in FIG. 1 is a monitor section, 2 is a signal switching adapter section, 5 is a boarding camera section for safety confirmation, and 7 is a fare display signal generator. Although FIG. 2 shows an example in which the signal switching adapter section 2 is separated from the monitor section 1, it may of course be integrated with the monitor section 1. 12 in the monitor section 1 is a vertical drive circuit;
13 is a vertical output circuit, 14 is a vertical deflection coil, 1
5 is a horizontal drive circuit, 16 is a horizontal output circuit, 1
7 is a horizontal deflection coil, 18 is a video amplification circuit, 19
is a high voltage circuit (generally about 300V when using a videocon as an image pickup tube), 20 is a constant voltage circuit, 21
2 is a camera vertical amplitude adjustment VR, and 22 is a camera horizontal amplitude adjustment coil. In the signal switching adapter section 2, 23 is a vertical oscillation circuit, 24 is a changeover switch for receiving camera signals and external signals, 25 is a synchronization separation circuit, 26 is a horizontal oscillation circuit, and 27 is an AFC.
28 is a frequency dividing circuit, and 29 is a 31.5KHz oscillation circuit. Further, in the entrance camera section 5, 30 is a camera vertical deflection coil, 31 is a camera horizontal amplitude coil, 3
2 is an image pickup tube, and 33 is a camera image amplification circuit. The operation shown in FIG. 2 is such that when a signal is received from the fare display signal generator 7 (this signal is received most of the time during driving), the fare display signal is sent to the selector switch 2.
The signal is sent to the video amplification circuit 18 through the contact C of No. 4. Further, this charge display signal is sent to the synchronization separation circuit 25, where the synchronization signal is separated.
14 vertical deflection systems and 27, 26, 15, 1
The charge display signal is received by the horizontal deflection systems 6 and 17 working synchronously. At this time, contact D,
Due to E, the _G2 voltage is not applied to the image pickup tube 32 of the entrance camera section 5, and the heater is in a preheated state. Here, the image pickup tube is devised so that its lifespan is not shortened. When the contacts of the changeover switch 24 are switched to the camera image receiving state, the 31.5KHz oscillation circuit 29 is activated at contacts A and B.
Both deflection systems operate in synchronization with vertical and horizontal synchronizing signals of interlaced frequency ratios generated by the frequency dividing circuit 28. Further, the contact point C is switched to receive the video signal from the entrance camera section 5, and the rated _G2 voltage and heater voltage are applied to the image pickup tube 32 at the contact points D and E. In this simple television camera in which the monitor section 1 and the entrance camera section 5 are connected by the multicore cable 4, many switching contacts are required to switch between the external signal and the camera signal. However, there are advantages in that the entrance camera section 5 can be made small, lightweight, and inexpensive, and that the image pickup tube 32 is kept in a non-operating state when receiving an external signal, allowing instantaneous image reception. A changeover switch 24 configured as shown in FIG.
If the contact point is a relay or semiconductor switch, it can be fully automated by controlling how the drive voltage is applied. Note that the correspondence between the contacts A to E and the first to third switching elements in the claims is as follows. First switching element → contacts D, E Second switching element → contacts C, Third switching element → contacts A, B Therefore, based on the functions of this system, consider a status table as shown in Table 1. This indicates whether the fare display signal or the entrance camera signal is to be received depending on whether the front door or the rear door is opened or closed. This status table shows that when the front door is open, passengers are getting off the train, so the driver can receive the fare display signal so that he can check the fare, and when the front door is closed, the fare display signal is received. Since this is unnecessary, it is a state table that allows the signal of the entrance camera unit 5 to be received. However, the front and rear doors

[Table] The closed state is normally during driving, so
As indicated by the arrow in Table 1, the image is switched from the entrance camera image to the fare display. However, immediately after a certain state changes to a state where the front and rear doors are closed, it is a state where the state changes from a stopped state to a state where the vehicle is running, so the image from the entrance camera unit 5 is not displayed for a certain period of time (for example, 5 to 10 seconds). After that, the system automatically switches to display the price. The second example shows an example in which a simple television camera is connected with a multi-core cable 4 between the monitor and the camera, and receives an image by switching to another external signal having a synchronizing signal.
FIG. 3 shows a specific example of a circuit that performs automatic switching as shown in Table 1 in the configuration shown in the figure. In Fig. 3, 41 is the vehicle battery, 42 is the rear door switch, 43 is the front door switch, 44 is the control circuit, 4
5 is a constant voltage conversion circuit, 46 is an inverter, 47 is a
48 is a delay circuit such as a one-shot multi, 49 is an OR circuit, 50 and 51 are transistors, and 52 is a relay. This relay 52 is the second
This corresponds to the changeover switch 24 in the figure. Further, the rear door switch 42 and the front door switch 43 are door switches that open when the door is closed and close when the door is opened. When the front door is currently open, the front door switch 43 is
ON, and the input level of the OR circuit 49 becomes high through the constant voltage conversion circuit 45, so the transistor 50 becomes conductive, the transistor 51 becomes non-conductive, the relay 52 does not work, and the state shown in FIG. 2 is achieved. Therefore, the price will be displayed. On the other hand, when both the front door and the rear door are closed, the switches 42 and 43 are turned OFF, and the inputs of the AND circuit 47 through the inverter 46 both become high level.
The output becomes high level. However, the delay circuit 48 and the OR circuit 49 work to keep the base of the transistor 50 at a low level for several seconds immediately after that, so the relay 52 works and receives the signal from the entrance camera. However, after the set time of 5 to 10 seconds has passed, the screen will switch to displaying the price. As described above, according to the present invention, a television camera provided at the entrance of a vehicle such as a bus and a monitor device are connected by a multi-core cable, a deflection current is supplied from the monitor device to the television camera, and the multi-core cable a first switching element for switching whether or not to supply low-voltage power, high-voltage power, etc. from the supply circuit of the monitor device to the television camera via the television camera; and a first video signal from the television camera and a charge display signal generator. a second switching element for switching and supplying a second video signal for displaying charges from and to the monitor device; a synchronization signal for the first video signal and a synchronization signal for the second video signal; a third switching element that switches and supplies the first to third video signals to the monitor device; and a control circuit that controls the switching drive circuit according to a combination of detection outputs from a switch that detects the opening/closing state of the front door and rear door of the vehicle. The driving of the third switching element can be automatically switched to a desired state by a combination of the front door switch and the rear door switch, and the burden on the driver can be greatly reduced. The control circuit is switched to the first to first switches after a certain period of time after it is detected that both the front door and the rear door are closed based on the detection output of each switch that detects the open/closed state of the front door and the rear door. By configuring the switching element No. 3 to include a delay circuit for switching from the television camera video signal receiving state to the charge display video signal receiving state, the front door and the rear door are both closed. For a certain period of time, you can automatically receive safety confirmation for departure, and after that, you can automatically receive a fare display.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a vehicle fare display camera system, FIG. 2 is a block diagram showing an embodiment of the present invention, and FIG. 3 is a specific block diagram of the main part. 1...Monitor section, 2...Signal switching adapter section, 4...Multi-core cable, 5...Exit camera section,
7... Price display signal generator, 24... Changeover switch, 42... Rear door switch, 43... Front door switch, 44... Control circuit, 48... Delay circuit, 52
……relay.

Claims (1)

[Scope of Claims] 1. A multi-core cable connects a television camera provided at the entrance of a vehicle such as a bus to a monitor device to supply deflection current from the monitor device to the television camera, and the multi-core cable a first switching element for switching whether or not to supply low-voltage power, high-voltage power, etc. from the supply circuit of the monitor device to the television camera via the television camera; and a first video signal and charge display signal generation from the television camera. a second switching element that switches between a second video signal for displaying charges from a device and supplies the same to the monitor device; and a synchronization signal for the first video signal and the second video signal.
a third switching element that switches between a synchronization signal for a video signal and supplies the synchronization signal to the monitor device; a switching drive circuit that switches the first to third switching elements accordingly, and a control circuit that controls the switching drive circuit in accordance with a combination of detection outputs from a switch that detects open/close states of a front door and a rear door of the vehicle. Vehicle fare display camera system equipped with 2 The control circuit operates the first to third switches after a certain period of time after it is detected from the detection output of each switch that detects the open/closed state of the front door and the rear door that both the front door and the rear door are closed. 2. The vehicle fare display camera system according to claim 1, further comprising a delay circuit for switching the switching element No. 3 from a television camera video signal receiving state to a fare display video signal receiving state.