JPH01268275A - Picture recorder - Google Patents

Abstract

PURPOSE:To reproduce the frame still picture of high quality by providing first and second recording heads, which can be freely engaged, in the adjacent track of a disk-shaped recording medium, simultaneously impressing signals in the first and second fields of a frame picture to the first and second recording heads respectively and simultaneously recording the signals to the recording medium. CONSTITUTION:First and second recording heads 44A and 44B, which can be freely engaged, are provided in the adjacent track of a disk-shaped recording medium 46 and the signals in the first and second fields of the frame picture are simultaneously impressed to the first and second recording heads 44A and 44B respectively and simultaneously recorded to the recording medium 46. Thus, since the signals in the first and second fields are simultaneously recorded by the first and second recording heads 44A and 44B, even when traveling ununiformity is generated in the recording medium 46 at the time of recording, the traveling ununiformity is equally operated to the first and second fields. Thus, the dislocation of picture elements between the fields, which is based on the difference of time base fluctuation in each field, is canceled and the still picture of the high quality can be reproduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an image recording device, and more specifically to a device for recording still image signals on a disk-shaped magnetic recording medium.

[Conventional technology]

Conventionally, in devices that record still images on disk-shaped magnetic recording media, such as image recording systems for electronic still video cameras, when recording frame images, the recording medium is rotated at 3.60 Qrpm, making one rotation. That is, the first field was recorded in 1760 seconds, and the second field was recorded in the next revolution.

That is, one frame of image was recorded in two rotations.

FIG. 4 shows a block diagram of a conventional image recording apparatus that records frame images using a two-channel thin film head. 10 is a magnetic disk as an image recording medium, 12.1
4 is a magnetic head 116, which is a motor that rotates the magnetic disk 10; 18, a PG coil that detects the rotational phase of the magnetic disk 10; 20, an input terminal for a recording start signal that instructs to start recording; and 22, a recording terminal of the input terminal 20. In response to a start signal.

A gate control circuit that generates a gate signal to control the application of recording current to the head 12 or 14 according to the PG pulse from the PG coil 18, 24 an input terminal for an image signal to be recorded, 26 an image signal at the input terminal 2G 28 is a recording amplifier that amplifies the output of the recording processing circuit 26, and 28 is a recording amplifier that amplifies the output of the recording processing circuit 26. , a recording current is applied to the first field signal to the head 12, and the second field signal is applied to the head 12.
4.

30' is a rotation control circuit that controls the motor 16 in accordance with the vertical synchronization signal separated by the recording processing circuit and the PG pulse from the PG coil 18. The rotation control circuit 30 controls the motor 16 to rotate at a constant rotation of 3.60 rpm, and controls the vertical synchronization signal from the recording processing circuit 26 to be synchronized with the PG pulse of the PG coil 18.

FIG. 5 shows a timing chart during recording.

FIG. 5(a) shows the image signal of the input terminal 24 (bl is P
The PG pulse output from the G coil 18 (C) indicates a recording start signal at the input terminal 20. The gate control circuit 22 is
In response to this PG pulse and recording start signal, as shown in FIG.
.

A gate signal shown in (f) is generated. In response to this, the recording amplifier 28 applies a recording current (FIG. 5(e)) to channel 1 (head 12) during the first rotation, and applies a recording current (FIG. 5(e)) to channel 2 (head 14) during the next rotation. Figure 5 (
g))). In this way, one frame of image is recorded on the magnetic disk 10.

[Problem to be solved by the invention]

However, when one frame of image signals is recorded in two rotations as in the conventional example, if the rotational precision of the motor 16 for driving the rotation of the magnetic disk 10 is poor, there will be uneven rotation during one rotation. A situation in which the rotational speed differs from rotation to rotation can normally occur. If such unstable rotational unevenness exists, the reproduced image will be displayed with vertical lines bent in different directions for each field, resulting in an extremely unsightly screen. This becomes a more serious problem in the case of a recording device in which the motor 16 is miniaturized and is further integrated into a camera. This phenomenon increases resolution,
The higher the image quality, the more noticeable it becomes.

Therefore, it is an object of the present invention to provide an image recording device that does not cause such problems.

[Means to solve the problem]

The image recording apparatus according to the present invention includes first and second recording heads that can be freely linked to adjacent trunks of a disk-shaped recording medium, and records signals of the first and second fields of a frame image, respectively. It is characterized in that it is simultaneously applied to the first and second recording heads to simultaneously record on the recording medium.

[Effect]

Since the signals of the first and second fields are simultaneously recorded by the first and second recording heads, even if there is uneven running on the recording medium during recording, the uneven running will be equal to that of the first and second fields. act. Therefore, pixel deviation between fields due to differences in time axis fluctuations between fields is eliminated, making it possible to reproduce high-quality still images.

〔Example〕

Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a block diagram of an embodiment of the present invention. However, since the rotational drive system of the magnetic disk 10 is exactly the same as that shown in FIG. 4, illustration thereof is omitted. 32 is an input terminal for an image signal to be recorded; 34 is an A/D converter; 36 is a frame memory capable of storing a plurality of frame images and read out in field units; 38;
A is a D/A converter for the first field, and 38B is a D/A converter for the first field. A/D converter 34,
Frame memory 36 and D/A converters 3sA, 3aB
is controlled by a clock from a clock generation circuit 39.

40A and 40B are recording processing circuits similar to the recording processing circuit 26 of FIG. 4, 42A and 42B are recording amplifiers, 44A is a recording head of channel 1 corresponding to the recording head 12 of FIG. The channel 2 recording head 46 corresponding to the recording head 14 in the figure is a magnetic disk.

The output of the recording amplifier 42A is supplied to the recording head 44A, and the output of the recording amplifier 42B is supplied to the recording head 44B. Reference numeral 48 denotes an input terminal for a recording start signal, and 50 denotes a gate control circuit that is activated by the recording start signal of the input terminal 48 and controls the recording amplifiers 42A and 42B to be in an output enabled (or activated) state in synchronization with the PG pulse. be.

The operation shown in FIG. 1 will be explained. The image signal input to the input terminal 32 is converted into a digital signal by the A/D converter 34, and both the first field signal and the second field signal are stored in the frame memory 36. In this way, one or more frame images are stored in the frame memory 3.
6.

When recording on the magnetic disk 46, the frame
The signals of the first field and the second field are read out from the memory 36 simultaneously. The two field signals are each sent to a D/A converter 38A.

38B, it is converted into an analog signal and sent to the recording processing circuit 40A.
, 40B, and is applied to recording amplifiers 42A, 42B. The gate control circuit 50 applies a recording gate signal to the recording amplifiers 42A and 42B at appropriate timing in response to the recording start signal and the PG pulse at the input terminal 48. Recording amplifiers 42A and 42B send output signals to recording heads 44A and 44B, respectively, in response to this gate control signal.
are applied at the same time. As a result, the first field signal and the second field signal are simultaneously recorded on the magnetic disk 46.

(1) in FIG. 2 shows the first input to the recording processing circuit 40A.
Field signal waveform (2) is recording processing circuit 40B
The signal waveform of the second field input to the same (3) is P
G pulse, (3) is the recording start signal of the input terminal 48, (4) is the recording gate signal output from the gate control circuit 50, and (5) is the recording current applied from the recording amplifier 42A to the recording head 44A. , (6) is a recording current applied from the recording amplifier 42B to the recording head 44B.

FIG. 3 shows a block diagram of a second embodiment applied to an electronic still camera. 52.54 is, for example, 7 in the horizontal direction
It is a color imaging device using an RGB stripe filter of 80 pixels and 240 pixels in the vertical direction, and the imaging device 54 is arranged to be shifted from the imaging device 52 by 1/2 pixel in the vertical direction.

Therefore, the output of the imaging device 52 corresponds to, for example, a first field signal, and the output of the imaging device 54 corresponds to a second field signal. Reference numeral 56 is a clock generation circuit, and its output clock causes the imaging bag! The charges of each pixel of 52.54 are transferred and read out. The outputs of the imaging devices 52 and 54 are applied to color separation circuits 58A and 58B, respectively, and are separated into a luminance signal Y and color difference signals RY and BY. The recording processing circuits 60A and 60B are color separation circuits 58A and 58B.
The recording amplifiers 62A and 62B amplify the outputs of the recording processing circuits 60A and 60B and simultaneously apply them to the recording heads 64A and 64B. The recording heads 64A and 64B simultaneously record the first field and second field signals on the magnetic disk 66.

In Fig. 3, two imaging devices are used, but it is also possible to use one imaging device that can read out the first and second field signals simultaneously, or even if they cannot be read out simultaneously, the first field output may be delayed in memory or the like, and synchronized with the next field output.

In the above embodiment, since the signals of the first field and the second field are recorded on the magnetic disk 46, 66 at the same time, that is, during the same rotation, there is little (both rotational unevenness for each rotation during recording). The time axis fluctuation due to this is exactly the same in the first field and the second field.Therefore, the image shift as shown in FIG. 6 is reduced.

〔Effect of the invention〕

As can be easily understood from the above explanation, 1. Even when the jitter of the recording medium i-motion motor is large, there is almost no pixel shift from field to field, and therefore high-quality frame still images can be reproduced.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of the configuration of one embodiment of the invention, Fig. 2 is an operation waveform diagram of Fig. 11, Fig. 3 is a block diagram of the configuration of the second embodiment, and Fig. 4 is the configuration of the conventional example. In the block diagram, FIG. 5 is an operation waveform diagram of FIG. 4, and FIG. 6 is a display example of a reproduced image according to the conventional example. 32--Image input terminal 36--Frame memory 39--Clock generation Circuit 40A, 40B, 60A,
60B-recording processing circuit 42A, 42B, 62A, 62
B- Recording amplifier 44A, 44B, 64 A, 6
4 B-Magnetic head 46, 66-Magnetic data 10-Disk 48-Record start signal input terminal 50-Gate control circuit 52.54-Image sensor 58A. 58B---Color separation circuit

Claims (1)

[Claims] The first recording head and the second recording head are provided which can be freely linked to adjacent tracks of the disk-shaped recording medium, and the first recording head of the frame image is
An image recording apparatus characterized in that the signals of the field and the second field are simultaneously applied to the first and second recording heads, respectively, and the signals are simultaneously recorded on the recording medium.