JPS61108279A - Color image pickup device - Google Patents

Abstract

PURPOSE:To stabilize the operation by an automatic control system of an open loop of short response time when an image is picked up in the place where a magnetic field is varied locally, by performing the control with the control loop of a close loop and that of the open loop whose control response time is shorter than that of the close loop. CONSTITUTION:A phase error signal extracted by a gate circuit GP1 not only controls the phase of the oscillated wave of an oscillator OSC by an automatic control circuit due to the close loop passing the circuit GP1, the oscillator OSC, a frequency converting circuit FCONV2, a phase detecting circuit PDET, and the circuit GP1 but also is used for the automatic control operation of the open loop for a variable delay circuit VDL to set an initial phase in every horizontal scanning period. A frequency error signal outputted from a frequency comparing circuit FCOMP controls the frequency of the oscillated wave of the oscillator OSC by an automatic control circuit due to the close loop passing the circuit FCOMP, the oscillator OSC, the circuit FCONV2, and the circuit FCOMP, and the phase error signal extracted by gate circuits GP1 and GP2 is supplied to a triangular wave generating circuit TWG, and the frequency error signal generated from the circuit TWG is used for the automatic control operation of the open loop for the circuit VDL to control the frequency.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a color television (hereinafter abbreviated as TV) imaging device, in particular, to a color separation cotton-like filter up to a photoelectric conversion surface of an imaging tube. The present invention relates to a color imaging device configured to be provided in an optical path.

(Prior art) A color-separating striped filter is provided in the optical path up to the photoelectric conversion surface of the image pickup tube, and a striped color-separated image of the object to be imaged is applied to the photoelectric conversion surface of the image pickup tube. It is well known that various types of color imaging devices that generate multiplexed signals have been known for a long time, but most of them are configured according to the so-called general phase separation method. Even if it is configured according to the so-called general frequency separation method, there are various problems, so the applicant company has decided to use the conventional general phase separation method. In order to provide a color imaging device that does not have the problems of those configured according to the separation method and those configured according to the general frequency separation method, Japanese Patent Publication No. 53-34
We proposed a color imaging system as disclosed in Japanese Patent Application No. 854, and as an improvement thereof, we proposed a color imaging device as disclosed in Japanese Patent Application Laid-open No. 153392/1985, that is, each strip has a predetermined width. It consists of repeating a specific arrangement pattern of a plurality of types of color strips, and the phase of the fundamental wave component of the image pickup tube output signal, which is determined corresponding to the repetition of the arrangement pattern, changes depending on the color of the light. A color-separating striped filter in which the colors of multiple types of color strips are set is provided in the optical path to the photoelectric conversion section of the image pickup tube, so that the optical image of the imaged object passes through the color-separating cotton-like filter. and a storage device capable of arbitrarily storing an information signal corresponding to at least one frame period of the output signal from the image pickup tube, Prior to imaging, any specific color is imaged, and an information signal corresponding to at least one frame period of the image pickup tube output signal is stored in the storage device, and the information signal stored in the storage device is In a color imaging device, a reference signal for color signal demodulation is obtained based on the reference signal, and a predetermined color signal is demodulated from the output signal of the image pickup tube by synchronous detection or the like. The time axis of one of the two signals, the information signal obtained by reading and the output signal of the image pickup tube, with one signal as a reference and the change mode of the other signal on the time axis as a reference. We have completed a color imaging device equipped with a control means to match the above variation, and have achieved many results by implementing it.

(Problems to be Solved by the Invention) However, in the color imaging device disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 59-153392, the information signal stored in the +5 storage device is read out and = One of the two signals, the obtained information signal and the output signal of the image pickup tube, is used as a reference, and the change mode of the other signal on the time axis is the time of one signal using the above reference. The control for matching the variation pattern on the axis is based on the frequency information in electron beam scanning obtained based on the index signal generated in the output signal of the image pickup tube and the frequency information for each horizontal scanning period in electron beam scanning. However, in order to ensure stable operation, closed-loop automatic control circuits generally have a relatively slow response speed. For example, when capturing an image in a place where local magnetic field fluctuations occur, if the response speed of the automatic control system cannot follow the temporal change of the cause of image distortion, the image The problem was that it caused distortion.

(Means for Solving the Problems) The present invention consists of repeating a specific arrangement pattern of a plurality of types of colored strips, each having a predetermined strip width, and corresponding to the repetition of the above arrangement pattern. The color separation striped filter, in which the colors of each of the plurality of color strips are set, is used for photoelectric conversion of the image pickup tube so that the phase of the fundamental wave component of the image pickup tube output signal changes depending on the color of the light. A configuration arrangement is provided in the optical path to the image pickup tube, so that the optical image of the object to be imaged is given to the photoelectric conversion section of the image pickup tube via the color separation striped filter, and a small amount of the output signal from the image pickup tube is provided. Tomo1
A storage device capable of arbitrarily storing an information signal corresponding to a frame period is provided, and prior to imaging, an arbitrary specific color is imaged and an information signal corresponding to at least one frame period of the image pickup tube output signal is provided. is stored in the storage device,
A color imaging device that obtains a reference signal for color signal demodulation based on the information signal stored in the storage device, and demodulates a predetermined color signal from the output signal of the image pickup tube by synchronous detection or the like. The optical path to the photoelectric conversion section of the image pickup tube is such that a signal generation pattern can be generated that can generate an index signal corresponding to the mode of scanning by the electron beam when the photoelectric conversion section of the image pickup tube is scanned by the electron beam. In preparation for this, frequency information in electron beam scanning and initial phase information for each horizontal scanning period in electron beam scanning are obtained from the index signal generated in the output signal of the image pickup tube. Using the frequency information in the electron beam and the initial phase information for each horizontal scanning period, the information signal obtained by reading out the information signal stored in the storage device and the output signal of the image pickup tube are selected. With one signal of
In a color imaging device provided with a control system that controls the change mode of the other signal on the time axis to match the change mode of one signal on the time axis as a reference, the control system is controlled by the control system. is performed in both the closed-loop control system and the open-loop control system, and as the open-loop control system described above, its control response time is greater than the control response time of the closed-loop control system. The present invention provides a color imaging device using a device configured as a short device.

(Example) Hereinafter, specific contents of the color imaging device of the present invention will be described in detail with reference to the accompanying drawings.

1 and 2 are block diagrams of embodiments of the container of the color imaging device of the present invention, and in each figure, 0 is an object to be imaged, 1 is an imaging lens, 2 is an imaging tube, and 3 is a deflection yoke. , 4 is a photoelectric conversion unit (target having a photoelectric conversion surface) of the image pickup tube 2, F is an optical color separation striped filter (color separation striped filter), 5 is a front plate of the image pickup tube 2, and PrA is a preamplifier. , LPFy, LPF Q is a low-pass filter (low-pass filter), and BPF is a band-pass filter (bandpass filter).

Note that if an electrostatic deflection type image pickup tube is used as the image pickup tube 2, it goes without saying that the deflection yoke 3 is unnecessary.

In the color imaging apparatus shown in FIGS. 1 and 2, an optical image of an object to be imaged 0 passes through a color separation striped filter
When the signal is applied to the photoelectric conversion unit 4, a color multi-carrier wave having a DC component and a specific repetition frequency is output from the image pickup tube 2, corresponding to the optical image of the imaged object ○, with an amplitude of 2.
Based on the phase-modulated modulated wave and a pattern for generating an index signal, which will be described later, an output signal from the image pickup tube 2 is output, which includes an index signal generated in accordance with the scanning mode of the electron beam. .

3(a) and 3(b) show the optical path of the image pickup tube 2 to the photoelectric conversion unit 4 so that an index signal corresponding to the scanning mode of the electron beam can be generated during scanning with the electron beam. 3 is a diagram showing an elliptical example of a signal generation pattern to be provided inside, and (a) and (b) of FIG.
, the square frame on the outer periphery indicates the photoelectric conversion section 4 of the image pickup tube 2.
In addition, the shaded area in the figure indicates the setting area of the index signal generation pattern, and the horizontal direction in the figure is the horizontal scanning direction. The vertical direction is the direction of vertical scanning, and index signals (a) and (b) in FIG. 3 are generated that correspond to the mode of scanning by one electron beam during scanning by an electron beam. An example of the relationship between the setting area of the signal generation pattern and the range of electron beam scanning performed on the photoelectric conversion unit 4 of the image pickup tube 2 will be illustrated and explained. It is something that exists.

In FIGS. 3(a) and 3(b), FIG. 3(a) shows that the index signal generation pattern to be provided in the optical path up to the photoelectric conversion unit 4 in the image pickup tube 2 is as described above.
At least one of the horizontal ends and at least one of the vertical ends of the photoelectric conversion unit 4 of the image pickup tube 2 are exposed to electrons during scanning by the electron beam. FIG. 3(b) shows an example of the configuration of an index signal generation pattern in a case where the pattern can generate an index signal that corresponds to the mode of scanning by a beam. In this case, an index signal generation pattern to be provided in the optical path up to the photoelectric conversion section 4 in the image pickup tube 2 is created by the electron beam in both the vicinity of the starting end and the vicinity of the end in the horizontal direction of the photoelectric conversion section 4 of the image pickup tube 2. This figure shows an example of the configuration of an index signal generation pattern in a case where it is possible to generate an index signal that corresponds to the mode of scanning by an electron beam during scanning.

In the color imaging device of the present invention, as will be described later, electron beam scanning is performed based on index signals generated in the output signal of the image pickup tube in correspondence with the above-mentioned index signal generation patterns. Using the frequency information and phase information in , one of the two signals, the information signal obtained by reading out the information signal stored in the storage device MA and the output signal of the image pickup tube 2, is used as a reference. , the control is performed so that the manner of change of one signal on the time axis corresponds to the manner of change of the other signal on the time axis.

As described above, as the pattern for generating the index signal that should be provided in the optical path up to the photoelectric conversion section 4 of the image pickup tube 2, for example, the pattern of the color separation striped filter F described above can also be used. You can also do it like this,
In that case, in order to generate an index signal from the pattern of the color separation striped filter F, light of an arbitrary specific color is used as bias light in the horizontal scanning direction of the color separation striped filter F. What is necessary is to irradiate both ends of .

Further, as another example of the above-mentioned index signal generation pattern that should be provided in the optical path up to the photoelectric conversion section 4 of the above-mentioned image pickup tube 2, for example, the above-mentioned color separation striped filter F in the horizontal scanning direction. A black and white pattern may be provided on both ends of the photoelectric conversion section 4 of the image pickup tube 2.
A pattern may be formed on both ends of the image pickup tube 2 in the horizontal scanning direction, or a member capable of generating a predetermined index pattern may be placed in the optical path to the image pickup tube 2 to form a pattern on the member. An optical image may be formed on the photoelectric conversion section 4 of the image pickup tube 2, and an index signal may be generated when the photoelectric conversion section 4 is scanned with an electron beam.

Now, the color separation striped filter F is, for example, as shown in (a) in FIG.
As shown, red (R), green (G).

It consists of strips of each color of blue (B) arranged in a predetermined repeating order, or as shown in FIG. 4(b), green (G) , cyan (Cy), and extra color light (W) are arranged in a predetermined repeating order, and other color strips of multiple types arbitrarily selected. Those that consist of repeating a specific sequence pattern are used.

The color strips of each color constituting the color separation striped filter F described above should have strip widths, colors, etc. set in consideration of brightness characteristics and color reproducibility. , In the color separation striped filter F illustrated in FIG. 4(a), (strip width of green color strip)>(strip width of red color strip)>(blue This shows an example in which the strip width of each color strip is determined, such as (strip width of each color strip).

1 and 2, the output signal from the image pickup tube 2 (
The color multiplexed signal) is a DC component and a color separation striped filter F.
The repetition period T of the set of color strips in ((a) of Fig. 4)
, a single carrier wave having a frequency shown as the reciprocal of T) in (b), and a modulated wave whose amplitude and phase are modulated by a plurality of color information. Therefore, the color multiplexed signal is divided into a DC component and a fundamental wave component of the carrier wave, and each of the fundamental wave components of the carrier wave, which is amplitude-9 phase modulated by the plurality of color information mentioned above, is divided into a DC component and a fundamental wave component of the carrier wave. By performing synchronous detection using a reference signal having a predetermined phase, it is possible to individually demodulate each predetermined color signal. However, when demodulating each of the above-mentioned color signals, a reference signal having a predetermined phase is required. It is said that

The phase of the fundamental wave component of the single carrier wave in the output signal of the image pickup tube of the color image pickup device described above is determined for each color of the plurality of types of color stripes that constitute the color separation striped filter F. Therefore, if light of any specific color is imaged through a color separation striped filter prior to the start of imaging by a color imaging device, the fundamental wave component of the carrier wave appearing in the output signal of the image pickup tube at that time can be detected. The phase is determined in correspondence with the color of light of any specific power color mentioned above, and is the fundamental wave of the carrier wave appearing in the output signal of the image pickup tube in correspondence with the color of light of any specific color mentioned above. The phase of the component can be used as a reference for the phase of the fundamental wave component of the carrier wave appearing in the output signal of the image pickup tube corresponding to each color other than the color corresponding to any specific color of light. can.

Therefore, as described above, prior to the start of imaging by the color imaging device, light of an arbitrary specific color is imaged through the one-color separation striped filter, and at that time, the nine obtained in the output signal of the imaging tube are A fundamental wave component of a single carrier wave is stored in a storage device, and during imaging operation in the color imaging device, the fundamental wave component of the carrier wave stored in the storage device is read out, and based on it, each predetermined By generating a reference signal having a phase, a desired color video signal can be generated by the color imaging device having the above-described configuration.

By the way, if the scanning mode of the electron beam in the image pickup tube 2 is always constant, the signal created based on the signal read out from the storage device as described above will always be the same as the output signal of the image pickup tube 2. The signal can be the same as the fundamental wave, but the deflection circuit and deflection yoke in color imaging devices are not sufficiently stable, and the scanning mode by the electron beam also changes depending on the external magnetic field.
Even if the information signal stored in advance in the storage device is read out as described above and a signal identical to the fundamental wave in the output signal of the image pickup tube 2 is created based on it, the signal will not always be correct. However, in conventional color imaging devices that use a closed-loop automatic control system with a relatively long response time, for example, when capturing an image in a place where there is a locally strong magnetic field, Image distortion could not be avoided.

Therefore, in the color imaging device of the present invention, an image pickup tube output signal is formed by repeating a specific arrangement pattern of a plurality of types of color stripes each having a predetermined strip width, and is determined in correspondence with the repetition of the arrangement pattern. A color separation striped filter F in which the colors of each of the plurality of color stripes are set so that the phase of the fundamental wave component changes depending on the color of the light.
is provided in the optical path up to the photoelectric conversion unit 4 of the image pickup tube 2,
A configuration arrangement that allows an optical image of an object to be imaged to be given to a photoelectric conversion unit 4 of an image pickup tube 2 via a color separation striped filter F, and corresponds to at least one frame period of an output signal from the image pickup tube 2. Storage device MA that can arbitrarily store information signals
is provided, and prior to imaging, captures an image of any specific color and stores an information signal corresponding to at least one frame period of the image pickup tube output signal in the storage device MA; This color imaging device obtains a reference signal for color signal demodulation based on the information signal stored in the MA, and uses the reference signal to demodulate a predetermined color signal from the output signal of the image pickup tube 2 by synchronous detection or the like. The image pickup tube 2 is provided with a signal generation pattern that can generate an index signal corresponding to the mode of scanning by the electron beam when the photoelectric conversion unit 4 of the image pickup tube 2 is scanned by the electron beam.
Frequency information in electron beam scanning and initial phase information for each horizontal scanning period in electron beam scanning are obtained from the index signal generated in the output signal of the image pickup tube 2 in preparation for the optical path to the photoelectric conversion unit 4 in . The information signal obtained by reading the information signal stored in the storage device HA and the image pickup tube using the frequency information in the scanning electron beam and the initial phase information for each horizontal scanning period described above. Using one of the two signals with output signal 2 as a reference, the change mode of the other signal on the time axis is made to match the change mode of the one signal on the time axis, which is the reference signal. In a color imaging device that is provided with a control system that controls the As a system,
By using an ellipsoid whose control response time is shorter than that of a closed-loop control system, for example, if there is a local magnetic field at the location where imaging is performed, it is possible to In a color imaging device, even if distortion occurs in a portion of the screen, the operation of an open-loop control system with a short response time prevents distortion from occurring in the image.

In FIGS. 1 and 2, the output signal (multiplexed color signal) of the image pickup tube 2 output from the preamplifier PrA is supplied to the low-pass filters LPFy, LPF fi and the bandpass filter BPFI, Low-pass filter 1. In FIG. 5, the cutoff frequency is illustrated as fy. The output signal from PFy (a direct wave three-color mixed signal) is outputted to the output terminal 6 as a broadband luminance signal. The curve LPFy in FIG. 5 is an example of the passband characteristic of the low-pass filter LPFy, and the curves LPFQ, BPF1, etc. in FIG. This figure illustrates an example of passband characteristics of a filter BPFI and the like.

The output signal from the low-pass filter LPF Q, whose cut-off frequency is illustrated as ffi in FIG. The BPF extracts a modulated color signal based on a fundamental wave existing around a spatial frequency fl determined by the repetition of filter strips in the color separation striped filter F, and supplies it to the subsequent betting circuit.

That is, in the circuit arrangement of the embodiment shown in FIG. 1, the modulated color signal based on the fundamental wave described above is transmitted to the variable delay circuit via the delay circuit IHDL for one horizontal scanning period, which is provided as necessary. VDI, and is also supplied to the phase detector P D ET, the gate circuit Gf, and the frequency conversion circuit FCONVI.

Further, in the circuit arrangement of the embodiment shown in FIG. 2, the modulated color signal by the fundamental wave described above is transmitted to the variable delay circuit VDL via the delay circuit IHDI for one horizontal running period, which is provided as necessary. It is also supplied to the phase detector PDET and the frequency conversion circuit FCONVI.

The output signal from the variable delay circuit Vr]t in each of the circuit arrangements shown in FIGS. 1 and 2 is transmitted to a synchronous detector 5D
It is supplied to ETI, 5DET2. The synchronous detectors 5DETI and 5DET2 are frequency conversion circuits FCO.
A reference signal is supplied from a reference signal generator SSG that generates a reference signal of a predetermined phase based on the signal output from NV2, respectively, and a synchronous detection operation is performed.

Further, as the other input to the phase detection circuit PDET described above, the output signal of the storage device MA is input to the frequency conversion circuit F
A signal frequency-converted by CONV2 is supplied as the other input.

The output signal from the above-mentioned phase detection circuit PDET is supplied to the gate circuit GPI and the gate circuit GP2, but one of the above-mentioned two gate circuits GPI and GP2 uses the above-mentioned index. A phase detection circuit PDET at a time position where one of the above-mentioned index signals that appear in the output signal of the image pickup tube 2 near the start end and near the end of each Bangi-hira scanning cycle depending on the pattern exists. It is designed to extract the phase detection output of the two gate circuits GPI,
The other gate circuit GP2 of the GP2 detects the other of the index signals that appear in the output signal of the image pickup tube 2 near the start and end of each horizontal scanning period according to the index pattern described above. The phase detection output of the phase detection circuit PDET at the time position where the object exists is extracted.

For this purpose, the two gate circuits GPI and GP2 described above are connected to a synchronizing signal generator S provided in the color imaging device.
Based on the HD pulse generated by G, the gate signal generation circuits GSpl and GSp2 are supplied with gate signals Sp1 and Sp2 generated at predetermined timings, respectively, so that the gate circuit Gpl outputs the output signal of the image pickup tube 2. From among them, extract the phase detection output at the time position where one of the index signals described above that appears in the output signal of the image pickup tube 2 exists in the output signal of the image pickup tube 2 every horizontal scanning period according to the index pattern described above, In addition, in the gate circuit Gp2 described above, the phase detection output is output at the time position where the other of the index signals described above that appears in the output signal of the image pickup tube 2 in each horizontal scanning period according to the index pattern described above exists. Extract.

- The phase detection output output from the gate circuit GPI is sent to the triangular wave generation circuit 1゛υG via the time constant circuit TCI.
The output signal from the time constant circuit TCI is supplied to the time constant circuit TC3 as well as to the variable delay circuit VDL described above.
It is also supplied to the one-shot multivibrator MH in the oscillator O3C, which will be described later.

In the circuit arrangement shown in the second diagram, the time constant circuit T
The output signal from CI is also supplied to the subtraction circuit SOB as one input thereof, and the above-mentioned subtraction circuit S
The other input to UB is the phase detection output supplied from the gate circuit GP2 to the triangular wave generation circuit TUG via the time constant circuit TC2. □In the circuit arrangement shown in FIGS. 1 and 2, the phase detection output output from the gate circuit GPI is initial phase information for each horizontal scanning period in electron beam scanning, and the circuit arrangement shown in FIG. In the arrangement,
Phase detection output from gate circuit GPI and gate circuit GP
Subtraction circuit S that outputs a difference signal with the phase detection output from 2
The output signal from OB is frequency information in electron beam scanning, and it is transmitted to oscillator O via time constant circuit TC5.
It is supplied as a control voltage to the voltage controlled oscillator ■CO in 3C.

Further, in the color imaging device shown in the circuit layout shown in FIG. 1, a pattern having the configuration shown in FIG. According to the pattern for signal generation, the gate signal generation circuit GSf generates a signal of 1 to 1 to the gate circuit Gf at the time position where the index signal appearing in the output signal of the image pickup tube exists in each vertical scanning period.
〜Frequency comparison circuit F by being supplied with signal Sf
COMP uses the above-mentioned index signal extracted via the gate circuit Gf from the color signal modulated by the fundamental wave in the image pickup tube output signal output from the bandpass filter BPF, and the signal read from the storage device MA. The frequency conversion circuit FCONV2 compares the frequency with the frequency-converted signal, and the frequency comparison circuit FCOMP obtains a frequency report indicating the frequency error between the two signals, which is then passed through the time constant circuit TC4. The output voltage is supplied to the voltage controlled oscillator vCO in the oscillator O3C as a control voltage.

In the circuit arrangement of each embodiment shown in FIGS. 1 and 2, the initial phase information for each horizontal scanning period in electron beam scanning obtained as described above and the Using the frequency information, one of the two signals, the information signal obtained by reading out the information signal stored in the storage device HA and the output signal of the image pickup tube, is used as a reference, and the other signal is determined. Control is performed so that the manner of change on the time axis matches the manner of change on the time axis of one of the signals used as a reference.

Now, the storage device MA shown in FIG. 1 and FIG. Both stores an information signal corresponding to one frame period,
Further, in a state after the color imaging device starts the imaging operation, the color imaging device is configured to perform an operation that can send out the stored information signal as a signal in a continuous state on the time axis. What is given is used. The storage element used in the storage device A may be a digital memory or an analog memory.

Although the specific structure of the storage device MA shown in FIGS. 1 and 2 is not shown, it is used in the circuit arrangement shown in FIGS. 1 and 2. The storage device HA to store at least one frame of the fundamental wave content (signal component passed through the bandpass filter BPF) in the output signal of the image pickup tube obtained by imaging an arbitrary specific color prior to imaging the object to be imaged. Something is needed that can store information signals that correspond to time periods.

Prior to imaging the object to be imaged, the fundamental wave content (signal component that has passed through the bandpass filter BPF) in the output signal of the image pickup tube is transmitted to the storage device HA for a period of at least 1 field or more. The storage operation of the information signal is started by operating a predetermined operation button on an operation section (not shown) provided on the color imaging device.

5. That is, when a predetermined operation button on the operation unit provided in the color imaging device is operated, for example, light of an arbitrary specific color is automatically applied to the image pickup tube, and A is set as the storage mode, so that at least one frame period of the signal component of the output signal of the image pickup tube 2 that has passed through the bandpass filter BPF is stored in the memory of the storage device.

The information signals to be stored in the storage device MA include (a) the fundamental wave intensity in the imaging tube output signal as described above; and (b)
A signal obtained by dividing the fundamental wave component in the image pickup tube output signal, (c)
Any signal obtained by beating down the fundamental wave component in the image pickup tube output signal with a frequency converter (which can be implemented by using a frequency converter circuit as in the circuit arrangement of the embodiment shown in Figs. 1 and 2) But it can be used.

In the circuit arrangement of the embodiment shown in FIGS. 1 and 2, when the storage device HA is put into the storage mode prior to the imaging operation, the period of one frame or more to be stored in the memory of the storage device HA is The information signal corresponding to the period is a signal obtained by frequency-converting the output signal of the image pickup tube by the frequency conversion circuit FCONVI, and is also a signal obtained by converting the output signal of the image pickup tube by the frequency conversion circuit FCONVI.
When the above signal has been stored in the storage device MA and the storage device MA is put into the read mode and the information signal stored therein is repeatedly read out from the memory, the information signal outputted from the storage device MA is transferred to the frequency conversion circuit. The signal that is to be stored in the storage device MA and the stored signal are frequency-converted by FCONV2, restored to a signal in the same frequency band as the output signal of the image pickup tube, and then supplied to the reference signal generator SSG. Each of the signals read from device MA has been subjected to frequency conversion.

In the circuit arrangement shown in FIGS. 1 and 2, the information signal read from the storage device MA is transferred to the frequency conversion circuit FCO.
The manner in which the information signal frequency-converted by NV2 changes over time i changes in accordance with the manner in which the output signal actually output from the image pickup tube changes on the time axis during imaging operations and lyrics. Each component works in a related manner so that it becomes what it is.

That is, in the illustrated embodiment device, the band wave transducer BP
The modulated color signal output from F is sent to the frequency converter circuit F.
The synchronous detector 5DETI is supplied to CONVI and the phase detection circuit PDET, and is also supplied to the synchronous detector 5DETI via the IH delay circuit and variable delay circuit VDL, which are provided as necessary.
It is also supplied to 5DIET2.

The frequency conversion circuit FCONVI described above is provided with a carrier wave for frequency conversion from the oscillator O3C. teeth,
The carrier wave for frequency conversion is supplied from the same oscillator O5C as the oscillator O8C that supplies the carrier wave for frequency conversion to the frequency conversion circuit FCONv2, which will be described later.

The signal output from the frequency conversion circuit FCONVI described above is stored in the storage device MA when the storage device MA is placed in the write mode, and when the storage device MA is placed in the read mode, the stored contents thereof are stored in the storage device MA. It is read out repeatedly. Then, as described above, the storage device HA
If the signal stored in is a signal obtained by beating down the original signal by the frequency conversion operation in the frequency conversion circuit FCONVI, it becomes possible to use a storage device MA with a small storage capacity. This is an advantage.

Once the aforementioned memory device MA has been put into the storage mode and an information signal corresponding to a suitable period of one or more frame periods has been stored therein, the memory device MA is then put into the read mode and the information stored thereon has been stored. A signal is repeatedly read from the storage device HA and supplied to the frequency conversion circuit FCONV2.

The frequency conversion circuit FCONV2 includes an oscillator OSC.
A carrier wave for frequency conversion is supplied from the frequency conversion circuit FCONV2, and the output signal from the frequency conversion circuit FCONV2 whose frequency is converted by the frequency conversion path FCONV2 is output from the reference signal generator SSG and the phase detection circuit in the case of the circuit arrangement shown in the first diagram. circuit P
DII! At the same time, the frequency comparison circuit F
The output signal from the frequency conversion circuit FCONV2 in the case of the circuit arrangement shown in the second diagram is also supplied to the reference signal generator SSG and the phase detection circuit PDET.
and is supplied to.

The above-mentioned phase detection circuit PDET is also supplied with a color signal modulated by the fundamental wave in the output signal of the image pickup tube output from the above-mentioned bandpass filter BPF. The above-mentioned two signals, that is, the color signal modulated by the fundamental wave in the image pickup tube output signal output from the bandpass filter BPF', and the image pickup tube output signal stored in advance in the storage device MA prior to imaging. The fundamental wave in the frequency conversion circuit FCONV
A phase error signal between the signal restored by 2 and the signal restored by 2 is output.

Since the phase error signal output from the phase detection circuit PDET described above is supplied to the gate circuits GPI and GP2, the phase error signal extracted by the gate circuits GPI and GP2 is transmitted to the photoelectric sensor of the image pickup tube 2 as described above. Conversion section 4
This corresponds to the portions where index signals generated in correspondence with the index signal generation patterns provided at the starting and ending portions in the horizontal direction respectively exist.

In the circuit arrangement shown in FIGS. 1 and 2, the phase error signal extracted by the gate circuit GPI described above is as follows: gate circuit GPI→time constant circuit TCI→time constant circuit TC3→
One-shot multivibrator of oscillator O3C → same settable voltage controlled oscillator vOC → frequency conversion circuit F
CONV2 → Phase detection circuit PDET → Gate circuit GPI
The closed-loop automatic control circuit is used to control the phase of the oscillation wave of the oscillator OSC, and
The phase error signal extracted by the gate circuit GPI described above is used for open-loop automatic control operation for the variable delay circuit VDL via the time constant circuit TCI, so that An automatic control action by a closed-loop automatic control circuit, in which the initial phase setting of This is done both by automatic control action by the control circuit.

In addition, the modulated color signal by the fundamental wave in the image pickup tube output signal output from the bandpass filter BPF and the fundamental wave in the image pickup tube output signal stored in advance in the storage device MA prior to imaging are used for frequency conversion. In the circuit arrangement shown in FIG. 1, the automatic control operation that should be performed in response to the frequency difference between the signal restored by the circuit FCONV2 and the signal restored by the circuit FCONV2 is performed when the frequency error signal output from the frequency comparison circuit FCOMP is passed through the time constant circuit TC4. is supplied as a frequency control voltage to the resettable voltage controlled oscillator vOC of the oscillator O5C.
OC→Frequency conversion circuit FCONV2→Frequency comparison circuit F
The frequency of the oscillation wave of the oscillator OSC is controlled by the closed-loop automatic control circuit of COMP, and the phase error signals extracted by the gate circuits GPI and GP2 from the output signal of the phase detection circuit PDET are Individual time constant circuit TCI.

Triangular wave generator circuit VG (see Figure 6) via Te3.
....The drawing numbers 11, 12, 13, etc. attached to each terminal shown in FIG. 6 refer to the triangular wave generation circuit T shown in FIGS. 1 and 2. This corresponds to the drawing reference marks attached to each terminal of %lG. Also, the 6th
The frequency error signal generated from the triangular wave generation circuit TwG is supplied to the variable delay circuit V
[) By being used for open-loop automatic control operation for This is done both by the automatic control action by the open-loop automatic control circuit whose response time is set to be shorter than the response time in the automatic control circuit, and on the other hand by the output from the bandpass filter BPF in the circuit arrangement shown in the second diagram. The modulated color signal by the fundamental wave in the image pickup tube output signal and the storage device MA prior to imaging.
The automatic control operation to be performed in response to the frequency difference between the fundamental wave in the output signal of the image pickup tube and the signal restored by the frequency conversion circuit FCONV2 stored in advance in the output signal of the phase detection circuit PDET is performed based on the output signal of the phase detection circuit PDET described above. The phase error signals extracted by the gate circuits GPI and GP2 from the respective time constant circuits TCI and TC2 are
The frequency error signal obtained by subtracting the signal and being supplied to 41SUB is supplied as a frequency control voltage to the resettable voltage controlled oscillator vOC of the oscillator OSC via the time constant circuit TC5. →Gate circuit GPI, GP2 →Time constant circuit T
CI, TC2 → subtractor SUB → time constant circuit TC5 → resettable voltage controlled oscillator vOC of oscillator O5C → frequency conversion circuit FCONV2 → phase detection circuit PDET by controlling the frequency of the oscillation wave of the oscillator OSC by the closed-loop automatic control circuit. At the same time, as in the case of the circuit arrangement shown in the first diagram, the phase detection circuit PD
The phase error signals extracted by the gate circuits GPI and GP2 from the output signal of the ET are sent to the triangular wave generation circuit T via individual time constants CI and Te3, respectively.
%IG (see Figure 6), the frequency error signal generated from the triangular wave generator TVG is used for open-loop automatic control operation for the variable delay circuit VDL, thereby controlling electron beam scanning. Frequency control is
Automatic control action by a closed-loop automatic control circuit that requires a relatively long response time, and automatic control action by an open-loop automatic control circuit whose response time is set to be shorter than the response time in the closed-loop automatic control circuit described above. This is done both with a control action.

The relationship between the size of each time constant in each time constant circuit shown in FIG. 1 is selected as follows: Te3 > TCI and Te3 > Te3. Note that an IH sample and hold circuit may be used as the time constant circuits TCI and TC2 in FIGS. 1 and 2.

As described above, the oscillator O5C is such that the angular frequency of the oscillation wave is controlled by supplying the frequency error signal, and the phase of the oscillation wave is controlled by the output signal from the gate circuit GPI.
The oscillator O3 shown in FIGS. 1 and 2 shows an example of the configuration of
In C, M is a one-shot multivibrator, and vco is a resettable voltage controlled oscillator, and the resettable voltage controlled oscillator vCO has its oscillation frequency controlled by the voltage of the control signal supplied to it. , and the timing at which it starts oscillating is controlled by the output signal of the one-shot multivibrator MM.

That is, the one-shot multivibrator M described above
The synchronization signal generator SG outputs a pulse with a time width from the time position of the leading edge of the HD pulse supplied to the terminal 7 to the time position determined by the control voltage, and the above-mentioned resettable voltage The controlled oscillator vCO starts oscillating at a specific oscillation phase when the reset pulse outputted from the one-shot multivibrator ① disappears.
c is a reference signal generator to which the frequency and phase of the oscillation wave are automatically controlled by the frequency control operation and phase control operation as described above, and the output signal (reference signal) of the frequency conversion circuit FCONV2 is supplied. The SSG generates the reference signal required to synchronize the output signal of the bandpass filter BPF with the correct phase. The output signal from the pass filter LPF Q is matrixed in the matrix circuit MTX and sent to terminals 8 to 1.
A predetermined primary color signal is outputted to each of the zeros.

(Effects of the Invention) As is clear from the above detailed explanation, the color imaging device of the present invention is made up of a repetition of a specific arrangement pattern of a plurality of types of color stripes each having a predetermined strip width. The colors of each of the plurality of color strips are set so that the phase of the fundamental wave component of the image pickup tube output signal, which is determined in accordance with the repetition of the arrangement pattern, changes depending on the color of the light. A color separation striped filter is provided in the optical path to the photoelectric conversion section of the image pickup tube, so that an optical image of the object to be imaged is given to the photoelectric conversion section of the image pickup tube via the color separation striped filter. A storage device capable of arbitrarily storing an information signal corresponding to at least one frame period of the output signal from the image pickup tube is provided. storing an information signal corresponding to at least one frame period of the image pickup tube output signal in the storage device, obtaining a reference signal for color signal demodulation based on the information signal stored in the storage device; This is a color imaging device in which a predetermined color signal is demodulated from the output signal of an image pickup tube by synchronous detection, etc., and corresponds to the mode of scanning by an electron beam at the time of scanning by an electron beam person in the photoelectric conversion section of the image pickup tube. A signal generation pattern capable of generating an index signal such as the one shown in FIG. Frequency information and initial phase information for each horizontal scanning period in electron beam scanning are obtained, and the frequency information and initial phase information for each horizontal scanning period in the scanning electron beam described above are used to be stored in a storage device. One of the two signals, the information signal obtained by reading out the information signal obtained by reading out the information signal and the output signal of the image pickup tube, is used as a reference, and the change mode of the other signal on the time axis is used as the reference. In a color imaging device that is provided with a control system that performs control so as to match the change pattern of the signal on the time axis, the control by the control system controls both a closed-loop control system and an open-loop control system. This is a color imaging device that uses the aforementioned open-loop control system whose control response time is shorter than that of the closed-loop control system. According to the color imaging device of the present invention,
For example, changes in characteristics due to changes over time or temperature characteristics, etc.
Changes in various characteristics over a relatively long period of time can be stabilized by automatic control operations by an automatic control system using a closed loop with a long response time. Since the automatic control operation by the open-loop automatic control system with a short response time works effectively and stabilizes the operation of the device, the present invention eliminates the drawbacks that occurred in the conventional color imaging device described above. Therefore, it is possible to provide a highly stable color imaging device that can easily generate stable and good color images at all times.

[Brief explanation of the drawing]

1 and 2 are block diagrams of embodiments of the color imaging device of the present invention, FIG. 3 is a diagram showing a pattern area for index signal generation, and FIG. 4 is a block diagram of a color imaging device of the present invention. The configuration of the color separation striped filter used is shown in FIG. 5, the frequency distribution of the output signal of the image pickup tube is shown in FIG. 6, and FIG. 6 is a circuit diagram showing an example of the configuration of a triangular wave generation circuit. O... Imaging target, 1... Imaging lens, 2... Image pickup tube, 3... Deflection yoke, 4... Photoelectric conversion section of image pickup tube (target having a photoelectric conversion surface), F. ...Color separation striped filter, 5...Front plate of image pickup tube, 6-14...
・Terminal, PrA...Preamplifier, LPyF, LPF
Q...Low pass filter (low pass filter), BPF...
・Bandpass filter (bandpass filter), VDL...variable delay circuit, MA...storage device, PDET...phase detection circuit, MTX...matrix circuit, O20...oscillator, VCO...・Resettable voltage controlled oscillator, HA
...Storage device, M...One-symit multivibrator, 5DETI, 5DET2-...Synchronous detection circuit,
FCONVI. FCONV2...Frequency conversion circuit, SSG...Standard signal generator, SG...Synchronization signal generator, GPI, GP
2...Gate circuit, GSPl, GSP2, GSf...
・Gate signal generation circuit, SOB...subtraction circuit, FC
OMP...frequency comparison circuit, Tl1lG...triangular wave generation circuit, GPI, GP2. Gf...gate circuit, T
CI~TC5... Time constant circuit, procedural correction band (voluntary) November 23, 1980 Manabu Shiga, Commissioner of the Japan Patent Office Color imaging device 3, relationship with the person making the correction Patent applicant Office Kanagawa 3-12 Moriya-cho, Kanayō-ku, Yokohama City, Prefecture Name (43)
2) Victor Company of Japan Co., Ltd. 4, Agent: Month, Day, Showa (Delivery date: Month, Day, Showa) 6: Attached drawings subject to amendment (Figure 1)

Claims (1)

[Claims] The phase of the fundamental wave component of the image pickup tube output signal is determined by repeating a specific array pattern of multiple types of color strips, each having a predetermined strip width, and the phase of the fundamental wave component of the image pickup tube output signal is determined in accordance with the repetition of the array pattern. A color separation striped filter, in which the colors of the plurality of color strips are set so as to change depending on the color, is provided in the optical path to the photoelectric conversion section of the image pickup tube, and the light of the object to be imaged is A configuration arrangement that allows an image to be applied to a photoelectric conversion section of an image pickup tube via a color separation striped filter, and a memory capable of arbitrarily storing an information signal corresponding to at least one frame period of an output signal from the image pickup tube. A device is provided, which images an arbitrary specific color prior to imaging and stores an information signal corresponding to at least one frame period of the image pickup tube output signal in the storage device; A color imaging device that obtains a reference signal for color signal demodulation based on an information signal stored in the image pickup tube, and demodulates a predetermined color signal from an output signal of an image pickup tube by synchronous detection or the like, A signal generation pattern is provided in the optical path up to the photoelectric conversion section of the image pickup tube so as to generate an index signal corresponding to the mode of scanning by the electron beam when the photoelectric conversion section of the image pickup tube is scanned by the electron beam. From the index signal generated in the output signal of the image pickup tube described above, frequency information in electron beam scanning and initial phase information for each horizontal scanning period in electron beam scanning are obtained, and the frequency in the scanning electron beam described above is obtained. One of two signals: an information signal obtained by reading out an information signal stored in a storage device using information and initial phase information for each horizontal scanning period, and an output signal from an image pickup tube. In the color imaging device described above, the color imaging device is provided with a control system that controls the change mode of the other signal on the time axis to match the change mode of the other signal on the time axis with reference to the reference signal. Control by the control system is performed by both the closed-loop control system and the open-loop control system, and the control response time of the open-loop control system is controlled by the closed-loop control system. A color imaging device configured to have a response time shorter than