JPS58191589A - Image pickup device - Google Patents

Abstract

PURPOSE:To obtain a picture with high resolution, by using two image pickup elements, outputting a luminance signal from the one element, outputting a line sequential signal from the other element and recording the luminance and chroma signals on separate tracks of a VTR. CONSTITUTION:Image pickup tubes 1Y, 1R, 1B outputting a luminance signal EY, a red signal ER and a blue signal EB are placed to the image pickup device, and the image light from an objective is formed on a image pickup plane of the tube 1Y via a pickup lens 2 and an optical system 3. The luminance signal from the tube 1Y is amplified and band-limited at a preamplifier 4Y and an LPF5, FM-modulated at an FM modulator 6 and recorded on the 1st track of a magnetic tape 9 with a magnetic head 8. Further, red and blue components are applied to the image pickup plane of the tubes 1R, 1B, the ER, EB are applied to a changeover switch 10, which switches the signals ER, EB at each scanning line and recorded on the 2nd track of the tape 9 with a magnetic head 16 via a buffer amplifier 12, an LPF13 and an FM modulator 14.

Description

DETAILED DESCRIPTION OF THE INVENTION For example, in a three-tube color imaging device, each of the three tubes receives a luminance signal and a first color signal (for example, a red signal).
Assume that a second color signal (for example, a blue signal) is obtained. Each of these signals typically has a band of 0 to 4 MHz.

In this case, in order to obtain a high-resolution image, for example, a band of 0 to 4 MHz is required for the luminance signal, or for the first and second color signals, it is difficult to distinguish colors in detailed images. For example, a band of 0 to 2 MHz is sufficient.

On the other hand, in a video tape recorder, the transmission band is limited to 0 to 4 MHz, and when recording the luminance signal and the first and second color signals as described above, the luminance It is conceivable that the signal is FM modulated and recorded on one track, and the remaining first and second color signals are FM modulated and recorded on 51 tracks.

The present invention proposes an imaging device that can obtain luminance signals and chrominance signals convenient for recording the luminance signals and chrominance signals on separate tracks in a video tape recorder as described above. It is something.

An embodiment of an imaging apparatus according to the present invention will be described below with reference to FIG. This example is a three-tube type, and is an example integrated with a video tape recorder.

In the figure, (IY), (IR), and (IB) are image pickup tubes for obtaining a luminance signal EY, a red signal ER, and a blue signal El, respectively.

Image light (red, green, and blue components) from object 0 (not shown in Figure 1) is applied to the imaging surface of the image pickup tube (IY) through the imaging lens (2) and optical system (3). ) is supplied, and an image corresponding to the OK subject is formed. This image pickup tube (IY) has a horizontal scanning frequency of fHl, for example, 15.75.
Horizontal scanning is provided at a normal rate of KHz. Therefore, when the object O is as shown in FIG. 2, a luminance signal EY as shown in FIG. 3A is obtained from this image pickup tube (IY).

This luminance signal BY is amplified and band-limited via a preamplifier (4Y) and a low-pass filter (5).

The signal is supplied to an FM modulator (6) and subjected to FM modulation. This FM-modulated luminance signal EY is sent to the recording amplifier (7).
The magnetic head (8) K is supplied through the magnetic tape (9).
) is recorded on the first track.

In addition, on the imaging surface of the image pickup tube (IR), there is a shooting lens (2).
The red component of the trench light from the subject 0 is supplied via the optical system (3), and a red image corresponding to the subject O is formed. This ms tube (IR) has a horizontal scanning frequency of 2f.
H, and horizontal scanning is performed at twice the speed of the image pickup tube (IY).

Therefore, when the object 0 is as shown in FIG. 2, a red signal EB with twice the normal horizontal frequency (2fa) as shown in FIG. 3 BK is obtained from this image pickup tube (IR).

This red signal gH is supplied to one fixed terminal (10a) of the selector switch (lI) via the preamplifier (4R).

In addition, on the imaging surface of the image pickup tube (IB), there is a monk lens (2).
The blue component of the image light of the object O is supplied through the optical system (3), and a blue image corresponding to the object O is formed. Similar to the image pickup tube (IR), this image pickup tube (IB) is also configured to perform horizontal scanning at twice the speed of the image pickup tube (IY). Therefore, when the object O is as shown in Fig. 2, the third
A blue signal EB with a horizontal frequency twice the normal frequency (2fu) as shown in FIG. C is obtained.

This blue signal EB is supplied to the other fixed terminal (10b) K of changeover switch 4 via a preamplifier (4B).

Further, the changeover switch α1 is supplied with a signal 8c from its terminal αυ, which has a feed level of 11'' and a low level of ``0''.In the changeover switch 4, this signal Sc is supplied with a high level of ``1''. ''', the movable terminal (IOC) is connected to one fixed terminal (10a), and when this signal 8c is at a low level "'O", the movable terminal (IOC) is connected to the other fixed terminal. (10b)
K is made so that K is connected.

In the end, the movable terminal (IOC) of this changeover switch,
One scanning line of the red signal ER supplied to one fixed terminal (10a) and the other fixed terminal (10a) as shown in FIG.
10b) 1gR/EB of the blue signal gB supplied with K
is obtained.

This line sequential color signal ER/EB is /<tufaa/pua'a
After the signal is band-limited via the pass filter 0, the signal is supplied to the FM modulator B4JIIC and subjected to FM modulation. Then, this FM modulated line sequential color signal FSR
/Bn is supplied to the magnetic head H via the recording amplifier 4 and recorded on the second track of the magnetic tape (9).

Although not shown, in a video tape recorder.

During playback, the FM-modulated luminance signal EY and line-sequential color signal BR are generated from the first and second tracks of the magnetic tape (9).
/EB is played back and FM demodulated. As for the luminance signal BY, the line sequential color signal ER/
Regarding EB, signal processing is performed by expanding each color signal to twice the time.

As is clear from the embodiments described above, according to the imaging device according to the present invention, a luminance signal and a line-sequential color signal can be obtained. and chrominance signals are recorded on separate tracks on a video tape recorder, the obtained luminance signals and line-sequential chrominance signals can be used as they are without any special processing, as shown in the above embodiment. So it's very convenient. [In this case, no memory, D/A converter, A/D converter, etc. are required to obtain line-sequential color signals, so the circuit becomes simpler, and the device as a whole becomes smaller, so it is possible to It is suitable for This is particularly effective when integrated with a video tape recorder as in the above-mentioned embodiment. Also, since a single color signal is treated as a line sequential color signal in the baseband, 8
It is possible to improve 7H.

In the above-described embodiment, three image pickup tubes are used as image pickup elements, but the number of image pickup tubes does not need to be three, and at least two image pickup tubes are sufficient.

In short, it is sufficient that a luminance signal can be obtained from one, and a line-sequential color signal similar to the above embodiment can be obtained from the others. In addition, in the above embodiment, line sequentially,
Although the color signals are red and blue signals, they may be of other colors. Furthermore, in the above embodiment, an image pickup tube is used as the image pickup element, but
A solid-state image sensor such as a COD may be used as the g1 element.

In this case, by arbitrarily setting the speed of the transfer lock, it is possible to have the same effect as doubling the horizontal scanning speed of the image tube in the above-described embodiment.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of an imaging apparatus according to the present invention, and FIGS. 2 and 3 are diagrams for explaining the example in FIG. 1, respectively. (IY) (IR) and (IB) are respectively image pickup tubes. (2) is an image pickup lens, (3) is an optical system, and Ql is a changeover switch.

Claims (1)

[Claims] 1. An imaging device comprising at least two imaging elements, wherein one of the imaging elements provides a luminance signal, and the other imaging elements provide a line-sequential color signal.