JPH0759066B2 - Electronic still camera - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Field of Industrial Application> The present invention relates to an electronic still camera, and is intended to always perform high-quality shooting.

<Prior Art> In recent years, an electronic still camera has been developed. In this electronic still camera, an optical image formed by an optical lens is converted into an image signal by a solid-state image sensor, and a video signal obtained by subjecting this image signal to FM modulation and the like is recorded in a microminiature magnetic floppy disk. To view the captured image, a miniature magnetic floppy is played on a playback device and played back as a still image on a TV image or the like and displayed.

<Problems to be Solved by the Invention> In the electronic still camera described above, it is impossible to retake an image even if a dropout occurs during magnetic recording.
This is because the subject is often moving, and the same photograph cannot be obtained even if the photograph is taken again, and the shooting opportunity is missed. On the other hand, when a magnetic floppy with dropout is reproduced, since the reproduced image is a still image, the image quality deterioration due to the dropout becomes conspicuous. However, the image quality is slightly improved when the reproduction is performed by the re-equipment having the dropout compensation circuit, but there is a limit to this.

The present invention has been made in view of the above-mentioned conventional art, and an object thereof is to provide an electronic still camera capable of magnetic recording without dropout.

<Means for Solving Problems> According to the present invention for achieving the above object, a signal to be recorded on a magnetic floppy is stored, and when a dropout occurs, a track including the dropout is once erased and stored. Recording the recorded signal on the erased track is the basis of the technical idea.

The present invention was devised based on the following findings. That is, there are two types of causes of dropout during recording, one of which is a defect in the magnetic floppy itself, such as the loss of magnetic powder, and the other is the cause of the magnetic head and the magnetic floppy during recording. This is the case when dust or the like accidentally enters in the meantime. The latter is the main of these two causes, and the dust that causes the latter often comes out immediately after entering between the magnetic head and the magnetic floppy disk. Therefore, in the present invention, even if dropout occurs due to dust, re-recording is performed after dust has been removed, and thus recording without dropout is realized.

<Examples> Examples of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a block diagram showing a first embodiment of the present invention. Optical lens 1 when you press the shutter of the electronic still camera
Thus, an optical image is formed, and the optical image is input to the image sensor 2 composed of a CCD (charge coupled device). The image sensor 2 outputs an image signal a corresponding to the input optical image, and the image signal a is input to the signal processing circuit 3. The signal processing circuit 3 subjects the image signal a to signal processing such as FM modulation and converts it into a video signal b. A part of the video signal b is input to the frame memory 4 and stored therein.
At this time, the changeover switch 5 is on the 5b side, and the changeover switch 7
Is input to the R side, a part of the video signal b sent from the signal processing circuit 3 passes through the changeover switch 5 and is amplified by the recording amplifier 6, and the amplified video signal b passes through the changeover switch 7. Data is recorded on a predetermined track of the magnetic floppy 9 by the magnetic head 8. The changeover switch 7 switches from the R side to the P side immediately after the recording on the magnetic floppy 9 by the magnetic head 8 is completed, that is, immediately after the magnetic floppy 9 makes one rotation for recording. When the changeover switch 7 is turned to the P side, the magnetic floppy 9
The video signal b recorded on the track is reproduced by the magnetic head 8, and the reproduced video signal b is reproduced by the reproducing amplifier 10.
After being amplified by, the signal passes through the dropout detection circuit 11 and reaches the output terminal 12.

The dropout detection circuit 11 detects the envelope of the video signal b and determines that there is a dropout when the value of the envelope becomes less than or equal to a predetermined value or becomes zero. When no dropout is detected by the dropout detection circuit 11, the magnetic head 8 recording the video signal moves to the next track and the stored contents of the frame memory 4 are cleared. When the shutter is pressed again, the next optical image is magnetically recorded in the same manner as described above. On the other hand, when the dropout detection circuit 11 detects a dropout, the control circuit 13 and the erase signal generation circuit 14 work together as described in detail below.
The track including the dropout is erased, and the video signal stored in the frame memory 4 is recorded on the erased track.

Here, the operations of erasing and re-recording will be described. When the dropout detection circuit 11 detects the dropout, the control circuit 13
Activates the erasing signal generating circuit 14 and turns on the changeover switch 5 to the side 5c and the changeover switch 7 to the side R. Then, the erase signal I sent from the erase signal generating circuit 14 reaches the magnetic head 8 through the changeover switch 5, the recording amplifier 6 and the changeover switch 7. At this time, since the magnetic head 8 is located on the track including the dropout, this track is erased by the erase signal I.
Such erasing is completed within several rotations of the magnetic floppy 9. Alternatively, an erasing dedicated head may be separately provided and erasing may be performed by this head. When the erasing is completed, the control circuit 13 now switches the selector switch 5 from the 5c side to the 5a side while keeping the selector switch 7 on the R side, and at the same time stores the video signal b stored in the frame memory 4.
Is sent. Then, the video signal b sent from the frame memory 4 is re-recorded on the erased track.
At this time, the dust or the like that caused the dropout is often removed from the magnetic head 8 naturally, and re-recording can be performed without the dropout.

If there is a dropout even though the erasure / rerecording is performed as described above, the erasure / rerecording is repeated until the dropout disappears.
If the dropout does not disappear even after the erasing / re-recording is repeated a predetermined number of times, it is determined that the magnetic floppy 9 itself has a defect such as a loss of magnetic powder, and the image signal b sent from the frame memory 4 is sent to the next track or Record on another new track.

During such erasure / re-recording, the next picture cannot be taken. Until this series of operations is completed, the next picture is prohibited, and further, a message indicating that the picture cannot be taken is displayed or an alarm is issued. Call attention to people.

FIG. 2 is a block diagram showing a second embodiment of the present invention. The frame memory 40 of this embodiment is the image sensor 2
The image signal a sent from is stored. When the dropout detection circuit 11 detects a dropout, the control circuit 13 controls the following erasure / re-recording. That is, the changeover switch 50 is turned on to the side 50b and the changeover switch 7 is turned to the side R, and the erase signal reproducing circuit 14 is operated to erase the track including the dropout with the erase signal I. After erasing is complete, switch 50 to 50
While switching from the b side to the 50a side, the image signal a stored in the frame memory 40 is sent out. As a result, the image signal a sent from the frame memory 40 is converted into the video signal b by the signal processing circuit 3, and this video signal b
Is re-recorded on the erased track. The recording in the normal state is executed in the same manner as in the first embodiment shown in FIG.

FIG. 3 is a block diagram showing a third embodiment of the present invention. In this embodiment, the SIT (Static Induction) is used as the image pickup unit.
An image sensor 20 composed of a transistor (electrostatic induction transistor) is used. The SIT type image sensor 20 has a function of converting an incident optical image into an image signal corresponding to the incident optical image and storing and storing a part of the image signal even after the image signal is transmitted.

In this embodiment, the optical image formed through the optical lens 1 is converted into the image signal a by the image sensor 20, and the image signal a is converted into the video signal b by the signal processing circuit 3.
The video signal b reaches the magnetic head 8 through the changeover switch 50, the recording amplifier 6, and the changeover switch 7 that are turned on the R side, and is recorded on the track of the magnetic floppy 9. After this recording, the changeover switch 7 is turned to the P side and the dropout detection circuit 11 detects the presence or absence of dropout. When the dropout detection circuit 11 detects a dropout, the control circuit 13 controls the following erasure / re-recording. That is, the changeover switch 50 is turned on to the side 50b and the changeover switch 7 is turned to the side R, the erase signal generating circuit 14 is operated, and the track including the dropout is erased by the erase signal I. After the erasing is completed, the changeover switch 50 is switched from the 50b side to the 50a side, and the image signal a stored and stored in the image sensor 20 is sent out. As a result, the image signal a sent from the image sensor 20 is converted into the video signal b by the signal processing circuit 3, and the video signal b is re-recorded on the erased track.

<Effects of the Invention> According to the present invention as specifically described in connection with the above embodiments, when an accidental dropout occurs due to adhesion of dust or the like, the track including the dropout is erased and stored in a memory or the like. Since the recorded signal is re-recorded on the erased track, dust or the like is naturally removed before erasing / re-recording, and recording without dropout can be performed, and a high-quality photographic image can be obtained. Further, even if the data is erased / re-recorded, the first signal is stored, so that the photo opportunity is not missed.

[Brief description of drawings]

1, 2 and 3 are respectively the first and second aspects of the present invention.
7 is a block diagram showing a third embodiment. FIG. In the drawings, 1 is an optical lens, 2,20 is an image sensor (imaging unit), 3 is a signal processing circuit, 4,40 is a frame memory, 5,7,50 are changeover switches, 6 is a recording amplifier, and 8 is a magnetic head. , 9 is a magnetic floppy, 10 is a reproduction amplifier, 11 is a dropout detection circuit, 12 is an output terminal, 13 is a control circuit, 14 is an erase signal generation circuit, a is an image signal, b is a video signal, and I is an erase signal. is there.

Claims (3)

[Claims] 1. An image pickup section for converting an optical image obtained through an optical lens into an image signal, a signal processing circuit for converting an image signal sent from the image pickup section into a video signal, and a memory for storing the video signal. An erasing signal generating circuit for generating an erasing signal, a magnetic recording / reproducing circuit for recording a video signal on the track of a magnetic floppy and reproducing the video signal from the same track immediately after the recording, and a magnetic head of the magnetic recording / reproducing circuit for reproduction. When the dropout detection circuit detects a dropout in the video signal, and the dropout detection circuit detects the dropout, the track including the dropout is erased by the erase signal. The transmitted and transmitted video signal is recorded again on the same track by the magnetic recording / reproducing circuit. Further, the re-recorded video signal is immediately reproduced after recording and is supplied to the dropout detection circuit to detect the presence / absence of a dropout. When no dropout is detected, the operation is ended. An electronic still camera having a control circuit that repeats operations of erasing, re-recording the same video signal on the same track, reproducing a video signal from the same track, and detecting the presence or absence of dropout a predetermined number of times until no dropout is detected. . 2. An image pickup section for converting an optical image obtained through an optical lens into an image signal, a signal processing circuit for converting an image signal sent from the image pickup section into a video signal, and a memory for storing the image signal. An erasing signal generating circuit for generating an erasing signal, a magnetic recording / reproducing circuit for recording a video signal on a track of a magnetic floppy and reproducing the video signal from the same track immediately after recording, and a magnetic head of the magnetic recording / reproducing circuit for reproduction. When the dropout detection circuit detects a dropout in the video signal and the dropout detection circuit detects the dropout, the track including the dropout is erased by the erase signal, and after the erase is completed, the image signal is stored in the memory. Magnetic recording and reproduction of video signals that are sent out and the sent image signals are converted by a signal processing circuit The recorded video signal is re-recorded on the same track again and then re-recorded, and the video signal is immediately reproduced and then supplied to the dropout detection circuit. When the out is detected again, the dropout detects the operations of erasing the above, rerecording the same video signal that is sent by converting the image signal from the memory and re-recording on the same track, reproducing the video signal from the same track, and detecting the presence or absence of dropout. An electronic still camera, comprising: a control circuit that repeats a predetermined number of times until it is no longer used. 3. An image pickup unit for converting an optical image obtained through an optical lens into an image signal and transmitting the image signal, and also for accumulating and storing a part of the image signal even after the transmission, and an erasing signal generating an erasing signal. The circuit and the magnetic recording / reproducing circuit that records the video signal on the magnetic floppy track and immediately reproduces the video signal from the same track after this recording, and the dropout in the video signal reproduced by the magnetic head of the magnetic recording / reproducing circuit is detected. A dropout detection circuit that
When the dropout is detected by the dropout detection circuit, the track including the dropout is erased by the erasing signal, and after the erasing is completed, the image signal accumulated in the image pickup section is transmitted and the transmitted image signal is converted by the signal processing circuit. The recorded video signal is recorded again on the same track by the magnetic recording / reproducing circuit, and the re-recorded video signal is reproduced immediately after recording and supplied to the dropout detection circuit to detect the presence or absence of dropout, and no dropout is detected. When the dropout is re-detected, the same video signal converted by sending the image signal from the erasing / imaging unit is re-recorded on the same track, the video signal is reproduced from the same track, and the dropout is performed. Presence / absence detection is performed a predetermined number of times until dropout is no longer detected. Ri returns the control circuit and an electronic still camera characterized in that it comprises a.