JPH02141082A - Video signal recording device - Google Patents

Abstract

PURPOSE:To decrease a miss-photographing due to blurring, etc., and to liberate a photographer from time restriction by storing a video signal obtained in a camera part into a memory at every picture, and recording it on a tape-shaped recording medium. CONSTITUTION:The video signal obtained by the camera part is stored into a memory 22 at every picture in response to a triggering switch 15. The carriage of a tape-shaped recording medium 8 is started by a recorder part 11, the video signal stored in the memory 22 is repeatedly recorded on the tape-shaped recording medium 8 at every picture for a prescribed period after the operation of the triggering switch 15. Thus, the camera holding only at the time of taking a still picture is sufficient, and the photographing error due to blurring, etc., is reduced, and the photographer is liberated from the time restriction.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a video signal recording device, and in particular to a video signal recording device comprising a camera section that converts a subject image into an electrical signal and a recorder section that records the video signal from the camera section. This invention relates to a signal recording device.

[Prior Art] In recent years, devices such as video cameras and video tape recorders, which have the functions of optically forming an image of a subject, converting it into an electrical signal, and recording it on a magnetic recording medium, have become popular. (VTR) (hereinafter referred to as a camera-integrated VTR) is becoming popular as consumer equipment.

FIG. 6 is a diagram showing a general configuration of a general camera-integrated VTR.

In FIG. 6, reference numeral 1 denotes a subject, and 2 denotes a main body of a camera-integrated VTR.The subject 1 is always imaged on an image pickup device 4 by an optical system 3. The subject image formed on the image sensor 4 is converted into an electrical signal by the image sensor 4, and further converted into a signal suitable for magnetic recording by the signal processing circuit 5. The video signal output from the signal processing circuit 5 is recorded on a magnetic tape 8 by two rotary heads 10 fixed to a rotary drum 7 (at this time, the rotary drum 7 moves in the direction indicated by the arrow in the figure). As the magnetic tape rotates, the rotary head 10 traces the magnetic tape diagonally.

On the other hand, the magnetic tape 8 is pulled out from the cassette 11 by a tape loading member 9 and attached to the outer peripheral surface of the drum 7, and is shown by arrow a in the figure by the cooperation of a capstan 12 and a pinch roller 13. being transported in the direction. As a result, the video signals output from the signal processing circuit 5 are recorded one after another on diagonal tracks on the magnetic tape 8.

In this way, a conventional general camera-integrated VTR continuously captures the subject image formed on the image sensor 4 driven by the drive circuit 6 for a standardized predetermined period (1/60 seconds for NTSC signals). ) is converted into an electrical signal, which is conveyed by a capstan 12 and a pinch roller 13 by a rotary head fixed to a drum 6 which is driven in synchronization with the image pickup device 4 by a drive circuit 6. The images are recorded sequentially as a video above.

Although the above description deals with an apparatus in which a camera and a VTR are integrally provided, moving image signals are recorded by similar operations in a system in which a VTR and a video camera are provided separately.

By the way, although such a camera-integrated VTR is used for recording moving images, there are many cases in which a video operator wants to record a certain moment of a subject. Therefore, the present applicant has previously proposed a video signal recording device having a moving image recording mode and a still image recording mode (Japanese Patent Application No. 60-276124
issue).

The apparatus disclosed in the above application records the captured image at that time on the same tape in a format different from the video recording format when a still image recording is commanded during video recording. This allows you to record still images of higher quality than each screen during video recording, and allows
It is extremely useful as it can also be used for still images.

[Problems to be Solved by the Invention] By the way, there is room for improvement in this type of moving picture/still picture device in the following points.

That is, first, when shooting a video, the camera must be held for the same period as the recording time.

In general, camera-integrated VTRs are heavier than cameras that use silver halide film as a record carrier (hereinafter referred to as still cameras). It was a work. Therefore,
When shooting a still image while recording a video, it may not be possible to capture a good still image due to camera shake or the like.

Furthermore, recording a video in this way requires a long recording time, and the user is subject to time constraints. This point has been an obstacle to using a camera-integrated VTR for still images.

Furthermore, if you want to organize still images taken during video recording or one screen in a video as still images, you need to extract these screens from a long tape and edit them using these and other devices. It involved a lot of work.

Furthermore, the general camera-integrated VTR has a problem in that it consumes more power than the above-mentioned still camera, and cannot perform long-term photography.

Against this background, one object of the present invention is to provide a video signal recording device that can record good still images using a device that records a video signal from a camera unit that converts a subject image into an electrical signal on a tape-shaped recording medium. It is an object.

Means for Solving Problem U] With such an objective, in the first invention of the present application, the video signal obtained by the camera section is stored in a memory for each screen in response to a trigger switch, and the video signal is recorded in the form of a tape in the recorder section. The recording medium starts to be conveyed, and the video signal stored in the memory is repeatedly recorded for each screen over a predetermined period of time after the trigger switch is operated on the tape-shaped recording medium being conveyed at a predetermined speed. There is.

Further, in the second invention of the present application, the video signal obtained by the camera section is stored in the memory for each screen in response to a trigger switch,
The video signal stored in the memory is repeatedly recorded screen by screen on a tape-shaped recording medium in the recorder section, and the power supply to the camera section is stopped during the recording.

Furthermore, in the third invention of the present application, the video signal obtained by the camera section is stored in a memory for each screen, and the video signal stored in the memory is repeatedly recorded for each screen on a tape-shaped recording medium in the recorder section. The automatic aperture control means and shutter speed control means in the camera section are configured to control the shutter speed to be set as fast as possible within the range of appropriate exposure.

E-Function: By configuring as in the first invention described above, it is possible to hold the camera only when taking still images, reducing mistakes in shooting due to camera shake, etc.; Furthermore, since still image signals are recorded on the tape-shaped recording medium at certain intervals, it is extremely easy to organize and search still images later. Now I can do it.

Moreover, by configuring as in the second aspect of the invention, power consumption can be significantly reduced, making it possible to perform long-term imaging. Moreover, this also reduces the battery capacity and improves portability.

Furthermore, by configuring as in the third invention, even when photographing a still image of a fast-moving object, it is now possible to automatically photograph a clear still image with appropriate exposure.

[Example] Examples of the present invention will be described below.

FIG. 1 shows a camera-type VT as an embodiment of the present invention.
This is a diagram illustrating the overall general configuration of R, and the same components as in FIG. 6 are given the same numbers, and the explanation will be omitted.

The changeover switch 19 is connected to the a terminal during video recording, and the electrical signal from the image sensor 4 is converted into a signal suitable for magnetic recording by the signal processing circuit 5, and the a terminal of the switch 19 is connected to the adder 29. The signal is supplied to the head 10 via the magnetic tape, and is recorded on a magnetic tape in the same manner as in the apparatus shown in FIG. That is, optical information that is constantly input as moving image information is written onto the magnetic tape at 60 frames per second.

Reference numeral 18 denotes an electronic viewfinder (EVF), which is connected to the output of the signal processing circuit 5 by a signal line (not shown). When recording a video, the image being shot is always projected on EVF 18, and the photographer uses EVF 1
You will be shooting a video while watching 8.

Reference numeral 13 denotes a still image switch, which is used to switch the apparatus between the moving image recording mode described above and the still image recording mode described in detail below. That is, by operating the switch 13 once, the apparatus switches between the moving image recording mode and the still image recording mode. Reference numeral 14 denotes a recording time setting switch, and by operating the switch 14, the photographer sets the desired time for recording a still image from about 1 second to infinity. The timer 20 receives the operation of the time setting switch 14 and measures the required time.

When the still image recording mode is set with the switch 13 and the time is set with the switch 14, the apparatus enters a still image recording standby state (hereinafter referred to as still standby mode), and the switch 19 is connected to the b terminal. In this still standby mode, the still control circuit 21 drives the image sensor through the drive circuit 6 and power supply circuit 26, and when the photographer looks at the EVF 18 and sees the screen he wants to record, he operates the trigger switch 15. . When the trigger switch 15 is operated, the video signal for one screen written in the memory 22 is repeatedly read out for a certain period of time determined by the timer 20, and is supplied to the head 10 via the adder 29. At this time, the still control circuit 21 controls the capstan 16 and the pinch roller 17 via the drive circuit 6, and conveys the magnetic tape 8 at a predetermined speed. The signals are repeatedly recorded on the magnetic tape 8. Then, when a certain period of time determined by the timer 20 has elapsed, conveyance of the tape 8 and recording by the head 10 are stopped.

Next, the operation of the audio control circuit 27 in FIG. 1 will be explained.

FIG. 2 is a diagram showing a specific configuration around the audio control circuit of FIG. 1, and the dotted line indicated by 27 in the figure indicates the circuit within the audio control circuit 27 of FIG.

In the above-mentioned still standby mode, the trigger switch 15
When is operated, a trigger signal is supplied to the still control circuit 21. When a trigger signal is input in the still standby mode, the still control circuit 21 instructs the drive circuit 6 to start recording a still image signal as described above, and also sends a still image signal to the signal generation circuit 32 in the audio control circuit 27. Notifies the start of signal recording.

This signal generating circuit 32 generates a predetermined audio signal in response to the start of recording a still image signal. This audio signal is
For example, a signal indicating the splashing sound of the shutter mirror of a still camera is generated. Sound generation circuit 33
drives the sound generator 34 in response to the sound signal from the signal generating circuit 32, and generates a pre-onomatopoeia "gasha" when recording of a still image signal is started in response to the operation of the trigger switch 15. Accordingly, both the photographed person and the photographer can recognize that a still image has been photographed.

The signal generation circuit 32 also supplies the signal related to this pre-onomatopoeic voice to the adder 30 as a signal suitable for magnetic recording, and sends the signal along with the collected sound signal from the microphone 28 to the adder 29 and the head 10 at the subsequent stage via a line 31. Supplied. In other words, the configuration is such that the audio signal related to this pre-onomatopoeia can be recorded on the tape 8 by the head 10 together with the video signal. As a result, when the reproduction of the still image recorded portion starts, the pre-onomatopoeia "gasha" is added according to the above example, so that it can be distinguished from video reproduction. Note that this sound generation circuit 33
The signal generated from this is a sound that is created arbitrarily, and any sound can be expected to have some effect. Also,
In the above example, the configuration is such that the pre-onomatopoeia is generated and recorded at the start of recording the still image signal, but it is also possible to perform these operations at the end of recording the still image signal.

Further, 35 and 37 are selection switches, respectively, the selection switch 35 controls the supply of signals from the audio generation circuit 33 to the audio generator 34, and the selection switch 37 controls the supply of signals from the audio generation circuit 33 to the audio generator 34.
2 to the adder 30. That is, the above-mentioned generation before onomatopoeia and recording on tape are performed as necessary. For example, in a place where the occurrence of pre-onomatopoeia is undesirable, such as a classical music venue, the selection switch 35 may be operated to prohibit the occurrence of pre-onomatopoeia, or the selection switch 37 may be operated to signal a signal related to this pre-onomatopoeia. may be prohibited from being recorded.

The control circuit 21 controls the EVF 1 at the start of recording the still image signal.
A display drive signal is supplied to 8. The EVF 18 is configured to turn on an LED in the viewfinder or to multiplex predetermined characters or images onto an image displayed by the EVF 18 in response to this display drive signal. Furthermore, these displays are continued until the end of still image recording.

Next, the supply of power to the camera-integrated VTR shown in FIG. 1 will be explained. As mentioned above, in the conventional camera-integrated VTR, it is necessary to supply power to at least the entire device when recording signals.

FIG. 3 is a block diagram showing a power supply path of the camera-integrated VTR shown in FIG. 1. In the figure, 43 is a lens section, which includes an autofocus section 51 for focusing, an auto iris section 52 for obtaining appropriate exposure, a power zoom section 53 for changing the focal length, and the like. Further, 44 is a camera section, and an image carrier drive section 54 for operating the image sensor;
It includes a signal processing circuit 55, a gain up circuit 56, a white balance circuit 57, and the like. The power supply circuit 26 supplies power to the lens section 43, camera section 44, and other sections such as an EVF section 58 for monitoring recorded video signals, a memory section 59, and a 718 section 40 for recording signals on tape. and all parts are operating.

Here, when still image recording is started by operating the trigger switch 15 in the still standby state, the video signal for one screen stored in the memory 22 is recorded on the tape 8 as described above. By the way, in this case, the EVF section 5
8. Only the memory section 59 and 718 section 40 need to be operating. In other words, the lens section 43 and camera section 44 do not necessarily need to be operating during still image recording. Therefore, in this embodiment, power supply to these parts is stopped during still image recording.

4 is a timing chart showing the timing of power supply by the power supply path of FIG. 3. FIG. In Figure 4, T
1 indicates the timing when the l/trigger switch 15 is operated in the still standby state, and T2 indicates the timing when the still image recording ends after the time set by the time setting switch 14 has elapsed after the trigger switch 15 was operated. In FIG. 4, A is the power supply to the lens section 43, B is the power supply to the camera section 44, C is the power supply to the EVF section 58, and D is the power supply to the EVF section 58.
indicates the state of power supply to the five memory sections, and E indicates the state of power supply to the VTR section 60. When indicated as ON, power is being supplied, and when indicated as OFF, power is being supplied. Indicates that you have not done so.

When still image recording is started at time T1 by operating the trigger switch 15, power supply to the lens section 43 and camera section 44 is stopped. Also, at the timing T2 when this recording ends, the EVF section S8 and the memory section 5
Since it is not necessary to supply power to the 9 and 718 parts 40,
The supply of electricity to these facilities has also been suspended.

Also, a still image will be displayed from the EVF section 58 between T1 and T2, but if there is no need to continue viewing this display, the EVF section 58 will display a still image from the timing indicated by TI to the timing indicated by a in FIG. Do not supply power to the unit 58.

According to this embodiment configured in this way, power consumption can be significantly reduced.

Therefore, in order to shoot without being restricted by cords,
When using a battery, long-time recording is possible even if the battery is made smaller, and the portability of this type of device can be dramatically improved.

Finally, shutter speed and aperture control in the camera-integrated VTR shown in FIG. 1 will be explained.

Even in conventional camera-integrated VTRs, various shutter speeds are obtained by controlling the charge accumulation time of the image sensor. Conventionally, the shutter speed has been set manually, but it is not desirable to arbitrarily set the shutter speed when photographing still images. This is because when shooting still images, taking into account the effects of camera shake and when shooting moving subjects, a shutter speed of about 1/60 seconds when recording a video cannot capture a moving subject clearly. Always 1/1
If the shutter speed is set to about 1,000 seconds, current image sensors will not be able to obtain an appropriate exposure amount unless the light is quite bright, resulting in a still image with poor S/N being recorded.

FIG. 5 is a diagram showing a specific configuration of the exposure control system circuit 23 in this embodiment, and the circuit within the dotted line 23 in FIG. 5 corresponds to the exposure control system circuit 23 in FIG. Further, the numbering of other parts is the same as in FIG.

The subject image passing through the optical system 3 is formed on the image sensor 4 via the aperture 25. When the information g from the still control circuit 21 described above indicates that the still standby mode is in effect, the level of the luminance signal from the signal processing circuit 5 is determined by the arithmetic circuit 6.
2, and the arithmetic circuit 62 determines the fastest shutter speed within the appropriate exposure range according to this detection level. Information d on the determined shutter speed is transmitted to a shutter speed setting circuit 63, and the circuit 63 controls the charge accumulation time of the image sensor to realize a shutter speed according to the information d. Further, the arithmetic circuit 62 supplies optimum aperture information C that allows proper exposure at the determined shutter speed to an aperture drive circuit 64, and the circuit 64 drives the aperture 25 in accordance with this information C to obtain an appropriate aperture. Set to .

Reference numeral 61 denotes an aperture knob, which is used to manually determine the aperture value. This aperture knob 61 is operated when the photographer wants to prioritize depth of field over shutter speed, and aperture information f set by this aperture knob 61 is supplied to an aperture drive circuit 64. The aperture value is determined and also supplied to the arithmetic circuit 62.

At this time, the arithmetic circuit 62 sets the shutter speed based on this information f.

Furthermore, when the information g from the still control circuit 21 indicates a moving image recording mode, the arithmetic circuit 62 inputs information c and d so as to perform exposure control for moving images, which is well known in a conventional camera-integrated VTR. decide.

Generally, the zoom ratio of a video camera in a camera-integrated VTR is about 6 times, and when converted to a still camera, it is 5 times.
Since it corresponds to a fairly long lens of about 0 mm to 300 mm, it is easily affected by camera shake. Furthermore, considering that the camera-integrated VTR itself is heavy and the shooting time is long, the effects of camera shake were serious.
In this embodiment, by configuring as described above, this problem can be solved, and even a moving subject can be recorded as a clear still image.

In the above embodiment, the memory has a capacity for one screen, and the data is repeatedly recorded on the tape. It is also possible to store one screen worth of images in each memory and repeatedly record these images one screen at a time on a tape.

Further, although the above-described embodiment has a configuration in which the audio signal is multiplexed with the video signal and recorded, the present invention can also be applied to a device that records the audio signal in a separate area from the video signal. It is.

Furthermore, although the present specification has been described using a camera-integrated VTR as an example, it goes without saying that the present invention can also be applied to a system in which a video camera and a VTR are separated. Furthermore, it goes without saying that the present invention is applicable not only to recording-only machines but also to recording and reproducing machines.

[Effects of the Invention As explained above, the present invention has the following effects.

In other words, by configuring the above-mentioned first invention, mistakes in photographing due to camera shake, etc. are reduced, and the photographer is freed from time constraints. Since image signals are recorded at certain intervals, it has become extremely easy to organize and search still images later.

In addition, by configuring the second invention as described above, power consumption can be significantly reduced and photography can be carried out for a long period of time.This also reduces battery capacity and improves portability. do.

Furthermore, by configuring as in the third invention, even when photographing a still image of a fast-moving object, it is now possible to automatically photograph a clear still image with appropriate exposure.

[Brief explanation of the drawing]

FIG. 1 shows a camera-type VT as an embodiment of the present invention.
2 is a diagram showing a specific configuration example of the audio control circuit of the camera-integrated VTR shown in Fig. 1, and Fig. 3 is a diagram showing the power supply of the camera-integrated VTR shown in Fig. 1. FIG. 4 is a timing chart showing the power supply timing of the camera-integrated VTR shown in FIG. 1, and FIG. 5 is a diagram showing a specific configuration example of the exposure control circuit of the camera-integrated VTR shown in FIG. , FIG. 6 is a diagram showing an example of the configuration of a conventional general camera-integrated VTR. In the figure, 4 is an image sensor, 5 is a signal processing circuit, 6 is a drive circuit, 8 is a magnetic tape, 10 is a head, 13 is a still image switch, 14 is a time setting circuit, 15 is a trigger switch, 18 is an electronic viewfinder, 20 is a timer, 21 is a still control circuit, 22 is a memory, 23 is an exposure control circuit, 26 is a power supply circuit, and 27 is an audio control circuit. Figure 4 Figure 85

Claims (5)

[Claims] (1) A video signal recording device consisting of a camera section that converts a subject image into an electrical signal and a recorder section that records the video signal from the camera section, the video signal being received by the camera section in response to a trigger switch. The video signals stored in the memory are stored in the memory for each screen, and the recorder section starts transporting the tape-shaped recording medium, and the trigger switch is moved onto the tape-shaped recording medium that is being transported at a predetermined speed. A video signal recording device characterized by repeatedly recording each screen over a predetermined period after an operation. (2) The video signal recording device according to claim (1), further comprising display means for displaying a specific display for the predetermined period after the trigger switch is operated. (3) A video signal recording device comprising a camera section that converts a subject image into an electrical signal and a recorder section that records the video signal from the camera section, the video signal obtained by the camera section being responsive to a trigger switch. and storing the video signal stored in the memory in a memory for each screen, and repeatedly recording the video signal stored in the memory on a tape-shaped recording medium for each screen in the recorder unit, and stopping power supply to the camera unit during the recording. A video signal recording device characterized by: (4) For a predetermined period of time after operating the trigger switch,
The video signal stored in the memory is recorded onto a tape-shaped recording medium, and the power supply to the recorder unit is automatically stopped after the predetermined period has elapsed. The video signal recording device described in (3). (5) A video signal recording device comprising a camera section that converts a subject image into an electrical signal and a recorder section that records the video signal from the camera section, the video signal obtained by the camera section being stored in a memory for each screen. The video signal stored in the memory is repeatedly recorded screen by screen on a tape-shaped recording medium in the recorder section, and the automatic diaphragm control means and shutter speed control means in the camera section are controlled within the range of appropriate exposure. A video signal recording device characterized by controlling a shutter speed to be set as fast as possible.