JPS5825783A - Photographed picture recording device - Google Patents

Abstract

PURPOSE:To execute the band conversion without using a special band converter, by providing an input part, to which the picture signal is inputted from the external, in the charge transfer part of a solid-state image pickup element and making driving frequencies for input and readout different from each other. CONSTITUTION:The picture signal from the external applied to an input terminal 8 is inputted to a register 10 through a voltage-charge converter 9. After the transfer to the register 10 is terminated, the charge of the register 10 is transferred to a register 2, and the input of the external picture signal to the register 10 is restarted. This operation is repeated to store the external picture signal in the register 2. The picture signal stored in the register 2 is transferred to a register 3 by readout pulses having a frequency different from that of driving pulses for the input to the register 10 and is outputted from a terminal 5 to a recording device (which is not shown in the figure) through a charge-voltage converter 4.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an image recording device using a solid-state image sensor such as a COD, and particularly to an image recording device that performs band conversion of an external image signal and its recording. In the recording mode, the device forms a photographed image on a solid-state image sensor, stores the image as a photocharge on the solid-state image sensor, reads out the photocharge accumulated on the solid-state image sensor, and records the image on a magnetic tape, magnetic disk, etc. In the recording device, the image signal is recorded as an image signal, and in the playback mode, the image signal recorded in the recording device is transferred to a monitor such as a television to execute the image recording and playback operation. Since a magnetic tape or a magnetic disk is used as a recording device, the recording speed of the signal in the recording device 5 or the reading speed of the signal from the recording device needs to be relatively low. requires a high-speed signal as an image signal.

For this reason, conventional devices are equipped with a memory device that transfers all the photocharges from the solid-state image sensor to the memory device in the recording mode, and supplies the signals transferred to the memory device to the recording device at low speed. Or, in the playback mode, signals are read out from the recording device at low speed.

That is, in conventional apparatuses, a memory device is provided that acts as a buffer memory to convert the speed of reading signals from the recording device or the recording speed of signals to the recording device and the speed of image signals to be supplied to a monitor or the like. This is achieved by adjusting the input and output speeds of signals to the memory device. Therefore, there are drawbacks such as a large-capacity memory device being required for speed conversion, resulting in an increase in the overall size of the device.

The present invention has been made in view of this point, and uses the charge transfer section of the solid-state image sensor as a buffer memory by inputting an external input signal to the charge transfer section of the solid-state image sensor. By changing the frequency of the drive signal for inputting an external input signal to the charge transfer section of the device and the frequency of the drive signal for reading out signals from the solid-state image sensor, the speed can be changed from a high-speed image signal to a low-speed signal or from a low-speed image signal to a high-speed signal. It is an object of the present invention to provide an image recording apparatus that eliminates the above-mentioned drawbacks by performing conversion.

Next, an image recording apparatus according to the present invention will be explained.

FIG. 1 is a circuit diagram showing an embodiment of a solid-state image sensor applied to a Wji image recording device according to the present invention.

In the figure, reference numeral 20 indicates a solid-state image sensor, and 1 in the element is a pixel constituting a light-receiving section.When a photographed image is formed on the pixel, each pixel receives light corresponding to the photographed image. Charge is accumulated. 2#i A vertical transfer register constituting a vertical transfer section, in which photocharge accumulated on a picture element is transferred to the register 2 by a gate pulse OG (not shown).
3 is a horizontal transfer register to which the charge of vertical transfer register 2 is transferred (, 6m, 6b, 7a, 7b
is a terminal to which driving pulses for the horizontal and vertical transfer registers are input, and is driven by supplying the driving pulses in the same way as driving a normal interline type area sensor. That is, the above driving pulse first transfers the photocharge of picture element 1a [~%N] from register 2 to register 3, and register 3 corresponds to the photocharge from picture element 1a-IN via charge-voltage converter 4. After outputting a voltage and reading out the charges of one digit of picture elements (1a=XN), the charges of picture elements 2a to 2N are transferred to registers 2 to 3, and register 3 receives the photocharges of picture elements 2a to 2N accordingly. Output voltage. Thereafter, voltages corresponding to the photocharges accumulated in each picture element are sequentially outputted in the same way, thereby sequentially outputting voltages corresponding to the photocharges from the picture elements 1a to NN.

IO is a horizontal transfer register, and an external image signal input to the external input signal terminal 8 is transferred to the register 1 via the voltage-charge converter 9.

The charges in the horizontal transfer register 10 are sequentially transferred to the register 2 in synchronization with the timing of charge transfer from the vertical transfer register 2 to the horizontal transfer register 3.

FIG. 2 is a block diagram showing an embodiment of a photographed image recording device according to the present invention, in which (a) shows an input mode of an external image signal, and (b) shows a recording mode to the recording device.

In the figure, 20 represents the solid-state image sensor of FIG.
5 indicates an external input terminal of the solid-state image sensor 20, and 5 indicates an output terminal. Reference numeral 21 indicates a recording device such as a magnetic tape or magnetic disk, and 24 indicates an external device that supplies an image signal to an external input terminal.

Next, the first. The present invention will be described in detail with reference to FIG. 2. Now, it is assumed that a high frequency image signal such as a TV signal is input to the terminal 8 from the external device 24. At this time, the external image signals are sequentially transferred to the register 2 via the register 10 by setting the drive pulse of the solid-state image sensor 20 to a high frequency suitable for the above frequency. That is, the external image signal is sequentially transferred to the register 10 as a charge via the voltage-charge converter 9, and when the transfer to the register 10 is completed, the charge in the register 10 is transferred to the register 2, and the external image signal is transferred to the register IO again. are input sequentially, and the above operations are repeated, thereby storing the external image signal in the register 2.

After that, the output terminal 5 of the solid-state image sensor 20 is connected to the recording device 21.
The image signal stored in the register 2 is recorded on the recording device 21 by connecting the solid-state image pickup device and performing a readout operation. In this case, by setting the frequency of the driving pulse of the solid-state image sensor to a frequency (low speed) that can be recorded by the recording device, the image signal is read out at a low speed and the image signal is recorded. When recording, a photographed image is formed on the solid-state image sensor 20 through a photographing optical system such as a lens, the image is accumulated as a photocharge on the picture element 1a=NN, and the photocharge is read out with a drive pulse. , normal photographing is performed by recording the image signal on the recording device 21.

As described above, in the photographed image recording device according to the present invention, the charge transfer section (transfer register) of a solid-state image sensor such as a CCD is used as a buffer memory, and the frequency of the signal input drive pulse to the charge transfer section and the readout drive are This method performs speed conversion, that is, band conversion, of the image signal by changing the frequency of the pulses.Since it is %6, band conversion can be performed without using a special band conversion device without providing a buffer memory as in the past. This can bring about great effects in the photographed image recording device.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing an embodiment of a solid-state image sensor applied to a photographed image recording device according to the present invention, and FIGS.
) is a block diagram showing an embodiment of a photographed image recording device according to the present invention. Figure 2(a) is the input mode; Figure 2(a) is the input mode;
b) shows the state of recording mode.

Claims (1)

[Claims] In a photographic image recording device that records image signals in a recording device using a solid-state image sensor, an input section for inputting an image signal from the outside is provided in a charge transfer section of the solid-state image sensor to enable input of an external signal. A photographed image recording device 0 characterized in that the driving frequency when reading the external signal is different from the driving frequency when reading the signal outputting the signal from the solid-state image sensor to perform signal band conversion.