JPH0646789B2 - TV camera device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television camera device in which a head portion and a main body portion can be separated from each other, and can be used for an eye of a robot, a surveillance camera, or the like.

2. Description of the Related Art Conventionally, this type of head-type separated camera has a third type
As shown in the figure, the main body 302 generates all the drive pulses of the image sensor 303 necessary for the head 301 in the pulse generator 306 and sends them to the head 301 side, and further, the sampling hold circuit 304 of the main body 302, A video signal is obtained by the signal processing circuit 305. 3
Reference numerals 07, 308, and 309 are a voltage control oscillator, a low-pass filter, and a phase comparison unit for applying external synchronization.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the above-described conventional camera for separating the head portion and the main body portion, since all the pulses necessary for driving the image pickup device are sent, the distance from the main body portion of the head portion cannot be extended was there. The present invention solves such a conventional problem, and makes it possible to remarkably increase the extension distance between the head portion and the main body portion.

Means for Solving the Problems According to the present invention, a main drive source of an image sensor provided in a head section is provided on the head section side, and a phase comparison section for comparing a comparison signal from the head section and a reference signal is provided on the main body side. It is a thing.

By doing this, the instability of DC component transmission due to the extension distance between the head part and the main body part is removed, and the synchronization stability is improved.

Embodiment FIG. 1 shows the structure of an embodiment of the present invention. In FIG. 1, A is a main body portion and B is a head portion. In the main body section A, 1 is a pulse generator, and 2, 3, 4 are a voltage control oscillator for externally synchronizing the entire camera system, a low-pass filter, and a phase comparison section.
Reference numeral 5 is a phase comparator for comparing the reference signal of the main body section A with the reference signal from the head section B, the output of which is high impedance, high level, or low level depending on the phase condition, and the signal of head section B It is sent to the low-pass filter 12. As a result, the signal from the head section B is transmitted to the main body section A.
When the signal reaches, the phase of the signal of the main body portion A will match. That is, the signal arriving from the head portion B can be processed in the main body portion A regardless of the extension distance between the head portion B and the main body portion A. In the head section B, the low-pass filter 12 converts the high level, low level, and high impedance of the output of the phase comparator 5 of the main body section A into DC. The DC output controls the oscillation frequency of the voltage control oscillator 11. The pulse generator 9 generates a necessary pulse using the clock controlled by the voltage control oscillator 11, and is reset by the V rate reset pulse from the pulse generator 1 of the main body A. A buffer circuit 8 drives the image pickup device 7. The sample hold circuit 10 separates the reset pulse output from the image sensor 7 from the video signal and removes the high frequency component of the reset pulse. Reference numeral 14 is a superimposing circuit of the video signal and the H rate reference signal of the head section B from the pulse generator 9. Reference numeral 15 is a separation circuit for the video signal and the reference signal in the main body A.
Reference numeral 6 is a power source for the main body A and the head B, respectively.

Next, the operation based on this configuration will be described. First, a pulse generator 1 (including an internal clock), or a PLL circuit including a voltage control oscillator 2 for external synchronization, a low-pass filter 3, and a phase comparison unit 4, a reference signal for separating a video signal, and an imaging The point that a signal for driving the element 7 is generated is the same as the conventional one, but the phase comparator 5, the low-pass filter 12, the voltage control oscillator 11, the pulse generator 9, the superposition circuit 14,
A second PLL circuit is formed by the separation circuit 15, and the H ″, L ″ and high impedance signals from the main body portion A are converted into DC by the low pass filter 12 in the head portion B,
The voltage control oscillator 11 is controlled. The pulse generator 9 is a buffer circuit 8
Through the driving of the image pickup device 7, the output of the image pickup device 7 through the circuit 8 is converted into a video signal by the sample hold circuit 10, and the superposition circuit 14 superimposes the pulse signal for H blanking.

On the other hand, on the side of the main body portion A, the video signal separated by the separation circuit 15 is added to the signal processing circuit 16 so that it can be taken out as an NTSC video signal. Note that FIG. 2 shows another embodiment. In the embodiment of FIG. 1, the pulse of the pulse generator 9 is superimposed on the output of the sample hold circuit 10 of the head section B. The pulse of the pulse generator 9 may be directly supplied to the phase comparator 5 of the main body A as shown in FIG.

EFFECTS OF THE INVENTION The present invention has the following effects in a head-separated camera, as is apparent from the above-described embodiments.

(1) Regardless of the extension distance, the signals from the head and body are
Since the signals are synchronized and the phases of both signals are always the same in the main body, signal processing in the main body is possible.

(2) Since the drive pulse generator of the image sensor of the head unit is inside the head unit and the pulses of this generator are synchronized so as to maintain a constant phase relationship with the main unit, extension of the head unit The image quality does not deteriorate due to the phase delay regardless of the distance.

(3) Since the reference signals for synchronizing the head unit and the main body unit are H rate signals, the H signal of the video signal is fed back from the head unit side to the main body side.
It can be superimposed during the blanking period.

(4) Since the reference signal is H rate, the reset signal is V
All you need to do is reset.

(5) Since the output of the PLL from the main body to the head is high level, low level, high impedance,
Compared to sending the direct current component directly, the main body portion and the head portion can be stably synchronized regardless of the extension distance.

[Brief description of drawings]

FIG. 1 is a block diagram of a television camera device according to an embodiment of the present invention, FIG. 2 is a block diagram showing another embodiment, and FIG. 3 is a block diagram showing a conventional device. 5 ... PLL, 7 ... imaging device, 9 ... pulse generator,
11 ... VCO, 12 ... LPF, A ... main body, B ...
… Head part.

Claims (3)

[Claims] 1. A head unit including an image pickup device and a drive unit for generating a drive signal for the image pickup device by using a clock controlled by a control signal from a main body unit, and the image pickup operation sent from the head unit. A television camera having a main body section including an auxiliary drive section that extracts a comparison signal resulting from the drive timing of the element, performs a phase comparison with a reference signal for external synchronization, and sends the control signal based on the comparison result to the drive section. apparatus. 2. The television camera device according to claim 1, wherein a high-level signal, a low-level signal, and a high-impedance signal of the control signal are converted into DC at the head portion. 3. The television camera device according to claim 1, wherein the comparison signal is superimposed on the video signal and transmitted to the main body.