JPH02132982A - Still video camera - Google Patents

Abstract

PURPOSE:To photograph and record a constant frame interval by recording an image pickup signal to the detected continuous non-recording track and when the recording is completed, stopping a consecutive photographing action and a recording action. CONSTITUTION:When a magnetic disk 11 is loaded at a camera main body, the detection of the non-recording track by a detecting circuit 15 is executed based on the reproduction output of a magnetic head 10 and the result is given to a CPU 9. The CPU 9, based on the detected result, starts the calculation of the number of recordable frames in accordance with the program given beforehand and judges whether or not the track is already recorded. Next, when the release is executed and the consecutive photographing is started, an image pickup signal obtained by a CCD 4 is recorded from the head 10 to a continuous non-recording track by the control of the CPU 9. When recording is completed to the continuous non-recording track, the CPU 9 stops the consecutive photographing action and the recording action. Thus, the area in which the recording is executed at the time of consecutive photographing can be made coincident to a continuous non-recording track.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a still video camera, and more particularly to a still video camera capable of continuous shooting at constant frame intervals.

[Prior Art] Still video cameras capable of continuous shooting have been known. Here, "continuous shooting" means shooting multiple frames of still images in one operation.

FIG. 5 shows a block diagram of the configuration of such a Sujiru video camera.

In this camera, when the quick return mirror 2 is in the position shown (down position), the light beam transmitted through the lens l and introduced into the camera is reflected in the direction of the arrow a, ). On the other hand, when photographing and recording with this camera, the quick return mirror 2 is raised (up) in the direction of arrow a by a mirror drive system (not shown).

In this case, the light flux (image) transmitted through the lens 1 passes through the mechanical shutter 3 without passing through the mirror 2, and is connected to a solid-state image sensor (hereinafter referred to as "CCD") located on the imaging plane of the optical system.
4) and photoelectrically converted into a video signal.

The video signal from the CCD 4 is subjected to predetermined signal processing in an imaging signal processing circuit 5 that performs gamma correction, etc., and a recording signal processing circuit 6 that performs emphasis/FM modulation, etc., and then amplified by a head amplifier 7, and is then used for recording/playback. Dual-purpose magnetic head lO
From magnetic disk! recorded in l. Here, the head amplifier 7 has a recording terminal (not shown), and the magnetic head 10 performs recording or reproduction, which will be described later, only when a recording or reproduction control signal is applied to the recording terminal.

Next, during reproduction, the output signal from the head 10 is amplified by the head amplifier 7 and given to the detection circuit (detection means) 15. The detection circuit 15 determines whether the track being reproduced is recorded or not, and the determination signal is provided to the central processing unit (detection means) 9.

In the above configuration, the opening and closing of the mechanical shutter 3 is controlled by the shutter drive circuit 8. Further, the magnetic head 10 is configured to move from track 1 to track 50 on the magnetic disk 1 under the control of a head movement circuit 13. Further, the magnetic disk 11 is controlled by a servo circuit 14 so as to rotate at a constant rotation speed (for example, 3600 rpm) via a rotation motor 12.

Control signals to these circuits 8, 13, and 14, the above-mentioned recording/reproduction control signals, and other timing signals necessary for each part of the camera are given from a central processing unit (hereinafter referred to as "CPU") 9.

FIG. 6 shows a time chart of one shooting and recording operation of the camera configured as described above. As shown in the figure, the mirror-up operation and mirror-down operation of the mirror 2 each require approximately 67 msec, and the operation of the mechanical shutter 3 requires approximately 33 msec. The time required for the operation of the mirror 2 and the shutter 3 occupies about 2/3 or more of the time +2V period (200 msec) required for one photographic recording operation. In this way, the time required for the operation of mirror 2 and shutter 3 is long, so continuous shooting and
When recording, conventionally the shooting/recording operation was performed at approximately 5 times per second.
The limit was to repeat it once.

Therefore, it has been proposed to use the electronic shutter mode of the CCD 4 to perform continuous photographing and recording operations 15 times per second as shown in FIG. This keeps the mirror 2 in an up position and the mechanical shutter 3 in a state where only the front curtain is running (so-called valve operation). By reading out the video signal by changing the charge accumulation time of the CCD 4, the CCD 4
The mechanical shutter 3 performs the same function as the mechanical shutter 3. When performing continuous shooting using the shutter function of the CCD 4, there is no need to move the mirror 2 up and move the mechanical shutter 3. If the recording period per frame is 1V and the head movement period is 3V, it is possible to photograph and record at a rate of 15 rpJ per second.

[Problems to be Solved by the Invention] Here, let us consider a case where continuous copying is performed using a partially recorded magnetic disk, for example, a magnetic disk 80 on which only the fifth track t5 is recorded as shown in FIG. think.

Assuming that recording is performed sequentially from the first track t1, after the recording on the fourth track t4 is completed, the magnetic head 10 must be moved to the next empty track, the sixth track t6. The tracking time during this period is 2
In order to move the track, the normal 2
It takes twice as long. Therefore, in the case of continuous shooting, there will be a gap between the fourth frame (recorded on the fourth track t4) and the fifth frame (recorded on the sixth track t6). That is, if the unrecorded tracks are discontinuous as described above, the moving time of the head becomes unstable and the frame spacing becomes inconsistent. As a result, partial omissions may occur in photographing and recording, which may defeat the purpose of continuous shooting.

In particular, since this type of camera is frequently used for reporting purposes such as recording various competitions, it is expected that if parts of the camera are missing during continuous shooting, it will not be possible to capture and record the decisive moment.

For example, if you take a series of photos of a golf swing, the swing action can be visually confirmed easily and has value because the shots are taken at equal time intervals, but if they are not taken at equal time intervals, the series of photos has little value. It's like nothing. Furthermore, it may not be possible to record the critical moment when the golf club head hits the golf ball.

The present invention has been made in view of these conventional problems, and an object of the present invention is to provide a still video camera capable of continuous shooting at constant frame intervals.

[Means for Solving the Problems] In order to achieve the above object, the first invention of the present application includes an imaging means, a magnetic disk rotatable at a constant speed, and an imaging disk obtained by the imaging means by the magnetic disk. A 612 head movable in the radial direction of the magnetic disk for recording on tracks of the disk and reproducing image signals recorded on the recording tracks of the magnetic disk, and an unrecorded track of the 611 disk based on the reproduction output of the magnetic head. In a still video camera capable of continuous shooting, the recording detection means is capable of detecting continuous unrecorded tracks.

In this case, during continuous shooting, the captured image obtained by the recording image capturing means is recorded on the continuous unrecorded track detected by the detection means, and when the recording on the continuous unrecorded track is finished, the continuous shooting operation and the recording operation are performed. may be stopped.

Further, a second invention of the present application includes an imaging means, a magnetic disk rotatable at a constant speed, and an imaging signal obtained by the imaging means is recorded on a track of the magnetic disk, and the imaging signal is recorded on a recording track of the magnetic disk. A still video camera capable of continuous shooting, comprising: a magnetic head movable in the radial direction of a magnetic disk for reproducing recorded images; and a detecting means for detecting unrecorded tracks on the magnetic disk based on the reproduction output of the magnetic head. In the continuous shooting operation, the moving time of the magnetic head between tracks is set to be the same time, and the magnetic head is controlled so as to sequentially record on unrecorded tracks detected by the output of the detection means.

Furthermore, the third invention of the present application includes a magnetic disk rotatable at a constant speed, an imaging signal obtained by the imaging means recorded on a track of the magnetic disk, and an imaging signal recorded on the recording track of the magnetic disk. In a still video camera capable of continuous shooting, which is equipped with a magnetic head movable in the radial direction of a magnetic disk to be reproduced, and a detection means for detecting unrecorded tracks on the magnetic disk based on the reproduction output of the magnetic head. There is an operation mode in which continuous shooting is ended by recording an imaging number on consecutive unrecorded tracks for a time, and an operation mode in which the imaging number is sequentially recorded on unrecorded tracks while controlling the time required for the magnetic head to move between tracks to be constant. The recording mode includes a recording mode, and one can be selected.

In any of the inventions, a display means may be provided for displaying the number of recordable frames based on unrecorded track information obtained by movement of the magnetic head prior to continuous shooting operation.

In this case, the number of consecutive pieces may be displayed, or the total number of unrecorded green pieces may be displayed.

[Function] According to the still video camera according to the first invention of the present application, the detection means for detecting unrecorded tracks of the magnetic disk based on the reproduction output of the magnetic head is configured to be able to detect continuous unrecorded tracks. There is. Therefore, when performing continuous shooting, it is possible to obtain information on the number of frames on a magnetic disk that can be continuously recorded at constant frame intervals.

In this case, the imaging signal obtained by the imaging means is recorded by a magnetic head on the continuous unrecorded track detected by the detection means, and when this recording is completed, the continuous shooting operation and the recording operation are stopped. It is possible to match the area with continuous unrecorded tracks.

Further, the still video camera according to the second invention of the present invention is configured to make the number of unrecorded tracks on the entire disk equal to the number of recordable frames during continuous shooting operation. In this configuration, during continuous shooting operation, the moving time of the magnetic head per track is the same regardless of whether the track is unrecorded or recorded, and the imaging signal obtained by the imaging means is detected by the output of the detection means. Control is performed so that the detected unrecorded tracks are sequentially recorded. Therefore, even if a plurality of unrecorded tracks exist with a recorded track in between, it is possible to record on each unrecorded track at a constant frame interval.

Furthermore, the still video camera according to the third invention of the present application has an operation mode (corresponding to the first invention of the present application) that records an imaging signal on continuous unrecorded tracks during continuous shooting and ends continuous shooting, and a magnetic head. A mote (corresponding to the second invention of the wooden jaw) that sequentially records the image capture number on unrecorded tracks while controlling the time required to move between the tracks at a constant rate, and makes it possible to select one of the two. It is. In this case, it is possible to selectively perform recording at a constant frame interval on both the last continuous recording track and the unrecorded track on the entire disc.

In any of the inventions, by providing a display means for displaying the number of recordable frames based on the unrecorded track information obtained by the B movement of the magnetic head prior to the continuous shooting operation,
It is possible to inform the user of the number of recordable frames on the i1-ki disc attached to the camera.

In this case, as the number of frames that can be displayed and recorded, the number of consecutive frames or the total number of red-recorded frames is used as desired.

In order to make the features and advantages of the present invention more clear, preferred embodiments are described below along with the accompanying drawings.

[Embodiment] FIG. 1 is a block diagram showing the configuration of a still video camera according to an embodiment of the invention.

In the drawings, the same reference numerals as those in the prior art described above indicate similar components.

Further, FIGS. 2 and 3 show flowcharts of two types of operational examples when continuous shooting is performed by the still video camera shown in the previous figure. In addition, in any operation example,
It is assumed that a IIIJ control program corresponding to each flowchart is provided to the CPU 9 in advance.

Embodiment 1 First, an embodiment of a still video camera according to the present invention will be described along the flowchart of FIG.

When the magnetic disk 1l is attached to the camera body, bliscanning (detection of unrecorded tracks) is performed by the detection circuit 15 based on the reproduction output of the magnetic head 10, as in the above-mentioned conventional technology.
is performed, and the result is given to the CPU 9. CPU
9 starts calculating the number of recordable frames according to a pre-given program based on the result of this bliscan (S
l). First, a variable C indicating the number of recordable frames and a variable N indicating a track number are set to 0 (S2).

Next, 1 is added to the variable N (S3), and it is determined whether the variable N to which 1 has been added is 50 or more (S4). This is because the number of recordable tracks is 1 to 50.

Here, since N is initially 1, it is natural that N<50.

If track N is 50, track N is selected from the pre-scan results.
It is determined whether or not it has been recorded (S5).

If the Nth track is unrecorded, 1 is added to the variable C (S6), and then the process advances to S3 and the above operations are repeated.

On the other hand, if the Nth track has been recorded in S5, it is determined whether the variable C is O (S7). Here, if the variable C is O, the process advances to S3 and the above operations are repeated.

Also, if the variable C is other than 0, the calculation ends (S8)
.

While repeating the above operations, if the variable N becomes 1 or more in S4, the process proceeds to 88 and the calculation ends.

As described above, from 31 to 8, the number of recordable frames is the number of continuous unrecorded tracks from the outermost track among the empty tracks. In this way, information on the number of frames that can be continuously recorded at constant frame intervals when continuous shooting is performed can be obtained.

The number of recordable frames is displayed on the display 16, for example (S
9) It is possible to inform the user of the number of frames that can be recorded with a constant frame interval.

Next, when the release is performed and continuous shooting starts (S10
). The imaging data obtained by the CCD 4 is recorded on continuous unrecorded tracks from the magnetic head 10 under the control of the CPU 9 (Sll).

When the recording on this continuous unrecorded track is finished, the CPU 9
stops the continuous shooting operation and recording operation (S12).

This makes it possible to match the area recorded during continuous shooting with the continuous unrecorded track.

If the magnetic disk 80 shown in FIG. 8 is mounted as an example of the magnetic disk 1l, the number of recordable frames obtained in S8, that is, the number of recordable frames displayed in S9, is four. This display allows the user to read the magnetic disk 80.
Now we know that it is possible to record four frames with constant frame spacing.

Now, assuming that recording is performed from the first track to the fourth track according to the above flowchart and continuous shooting is once completed, the number of recordable frames when continuous shooting is performed again is 45. In this way, the unrecorded t3 track on the disc can be recorded without waste.

Practical Example & Example 2 Next, another example of the still video camera according to the present invention will be described along the flowchart shown in FIG.

In the figure, 321 to 25 are 31 to 4 in Figure 2.
The same operation is performed, and the explanation thereof will be omitted.

In S25, if the Nth track is unrecorded, 1 is added to the variable C (S26), then the process advances to S23 and the above operations are repeated. On the other hand, if it is determined in S25 that the Nth track has been recorded, the process advances to S23 and the above operations are repeated. While repeating the above operations, the calculation ends when the variable N becomes 50 or more in S24 (S27
).

Through this calculation, the number of recordable frames becomes the number of unrecorded tracks on the entire disc.

As described above, from 321 to 27, the number of recordable frames is the number of continuous unrecorded tracks from the first track. The number of recordable frames determined in this way can be displayed on the display, for example, before shooting.
6 (528). Here, the magnetic disk 11
As an example, when the magnetic disk 80 is installed, the number of recordable frames displayed is 49, indicating that the magnetic disk 80 can record 49 frames.

Next, when the release is performed and continuous shooting starts (S29
), the CPU 9 controls the head movement circuit 13 so that the movement time between tracks of the magnetic head 10 becomes the same time (hereinafter, this control is referred to as ``same movement time control'').
. The CPU 9 further applies a CC to each detected vermilion recording track.
The head amplifier 7 is controlled so that the first image word number of D4 is recorded sequentially from the magnetic head IO (S30).

Here, the same travel time control will be explained.

It is assumed that a magnetic disk 80 is used as the magnetic disk 11. On the magnetic disk 80, the fourth frame (
When the magnetic head 10 moves from the fifth frame (recorded on the fourth track t4) to the fifth frame (recorded on the sixth track t6), the head movement time (jump length 3V period is required for the operation time). In this case, assuming that the time required for recording per track is 4V periods, a waiting time period of 1V period for temporarily stopping the movement of the magnetic head 1l is added to the interlaced movement time of 3V periods. No recording operation is performed during this waiting time period of 1v. Therefore, the moving time of the magnetic head l1 per track is 4.5 mm regardless of whether the track is recorded or unrecorded.
period. Due to this movement time uniform control, the recording will be skipped by one frame from the fourth frame to the fifth frame, but the frame skipping time will match the frame interval. As long as this missing frame does not interfere with the analysis of continuous motion, it is possible to allow 49 frames to be shot in succession while allowing this missing frame. In addition, if this travel time uniform control is not performed, the fourth
An inconvenience occurs in that the missing time does not match the frame interval from the 5th piece to the 5th piece.

As described above, while the same movement time control is performed, recording is performed sequentially on unrecorded tracks, and when this recording is completed, the CPU 9 stops the continuous shooting operation and the recording operation (S
31).

Although two types of operation examples have been described above, one or both of the control programs may be provided to the CPU 9 in advance in response to both operation examples. If both control programs are to be provided here, it is possible to provide a selection switch 17 that instructs the CPU 9 to switch between the two control programs, so that both control programs can be selectively executed depending on the status of unrecorded tracks on the disc. can.

In the above embodiment, the head movement speed per track was set to 3 to 4 seconds, as an example, but the present invention is not limited to this.

Even if the head movement speed changes in the future, for example, if it becomes possible to move the head at a period of 1 to 2 V per rack,
The present invention is applicable.

Furthermore, it would be more convenient if the disc information displayed on the display 16, in addition to the number of recordable frames, simultaneously displayed the unrecorded tracks of the entire disc or displayed the continuous shooting time. .

[Effects of the Invention] Since the present invention is constructed as described above, it produces the effects as described below. Since the detection means for detecting the unrecorded track of the 611 disc is configured to detect the last continuous recording track, it is possible to obtain information on the number of frames that can be shot continuously at fixed frame intervals.

When actually performing continuous shooting, the shooting number is recorded on the continuous unrecorded track detected above, and when this recording is completed, the continuous shooting and recording operations are stopped, thereby allowing shooting and recording at constant frame intervals. can be done.

Furthermore, by setting the magnetic head's movement time between tracks to be the same during continuous shooting and sequentially recording the image pickup numbers on unrecorded tracks, 11-frame images and recording at a constant frame interval can be performed. In this case, assuming that there are a plurality of unrecorded tracks sandwiching a recorded track, it is possible to record on each unrecorded track at a constant interval.

Furthermore, there is an operation mode in which image signals are recorded on consecutive unrecorded tracks during continuous shooting to end continuous shooting, and an operation mode in which image signals are sequentially recorded on unrecorded tracks while controlling the time required for the magnetic head to move between tracks. By making it possible to select one or the other, it is possible to selectively record at a constant frame interval on both continuous unrecorded tracks and unrecorded tracks on the entire disc. It is possible.

Alternatively, by providing a display means that displays the number of recordable frames based on unrecorded track information, the user can be informed of the recordable number of frames (number of consecutive frames or total number of unrecorded frames) on the magnetic disk attached to the camera. All you have to do is let us know.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of a still video camera according to an embodiment of the present invention, FIGS. 2 and 3 are flow charts showing the operation of the still video camera shown in the previous figure, and FIG. 4 is a block diagram showing the configuration of a still video camera according to an embodiment of the present invention. FIG. 5 is a block diagram showing the configuration of a conventional still video camera. FIGS. 6 and 7 are time charts showing the continuous shooting operation of a conventional still video camera. FIG. 8 is an explanatory diagram of a magnetic disk having recorded tracks, and FIG. 9 is a time chart showing track movement of the magnetic head. [Explanation of symbols of main parts] 4...CCD 9, 10... -Magnetic head, -Magnetic disk, l6...Display, l7...Selector, CPU

Claims (7)

[Claims] (1) An imaging means, a magnetic disk rotatable at a constant speed, recording an imaging signal obtained by the imaging means on a track of the magnetic disk, and reproducing the imaging signal recorded on a recording track of the magnetic disk. In a still video camera capable of continuous shooting, comprising a magnetic head movable in the radial direction of a magnetic disk, and a detection means for detecting an unrecorded track on the magnetic disk based on the playback output of the magnetic head, the detection means comprises: , a still video camera characterized by being able to detect continuous unrecorded tracks. (2) During continuous shooting, the imaging signal obtained by the imaging means is recorded on the continuous unrecorded track detected by the detection means, and when the recording on the continuous unrecorded track is finished, the continuous shooting operation and the recording operation are stopped. Claim 1 characterized in that
The still video camera described. (3) An imaging means, a magnetic disk rotatable at a constant speed, recording an imaging signal obtained by the imaging means on a track of the magnetic disk, and reproducing the imaging signal recorded on a recording track of the magnetic disk. In a still video camera capable of continuous shooting, which is equipped with a magnetic head movable in the radial direction of the magnetic disk and a detection means for detecting unrecorded tracks on the magnetic disk based on the playback output of the magnetic head, during continuous shooting operation. A still video camera characterized in that the time required for moving the magnetic head between tracks is the same, and the magnetic head is controlled to sequentially record on unrecorded tracks detected by the output from the detection means. (4) An imaging means, a magnetic disk rotatable at a constant speed, recording an imaging signal obtained by the imaging means on a track of the magnetic disk, and reproducing the imaging signal recorded on a recording track of the magnetic disk. In a still video camera capable of continuous shooting, which includes a magnetic head movable in the radial direction of the magnetic disk, and a detection means for detecting unrecorded tracks on the magnetic disk based on the playback output of the magnetic head, during continuous shooting, An operation mode in which continuous shooting is completed by recording imaging signals on consecutive unrecorded tracks, and a mode in which imaging signals are sequentially recorded in unrecorded tracks while controlling the time required for the magnetic head to move between tracks to be constant. and
A still video camera characterized in that either one can be selected. (5) The still video according to any one of claims 1 to 4, further comprising display means for displaying the number of recordable frames based on unrecorded track information obtained by movement of the magnetic head prior to continuous shooting operation. camera. (6) The still video camera according to claim 5, which displays the number of consecutive frames. (7) The still video camera according to claim 5, wherein the total number of unrecorded frames is displayed.