KR900008890B1 - Picture image recording apparatus - Google Patents

Abstract

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Description

Video recorder

1 is a circuit block diagram of a camera integrated VTR according to an embodiment of the present invention.

2 is a synchronous signal control circuit used in the apparatus.

3 is a transition display diagram of a system operation state of the apparatus.

4 is a waveform diagram of each part of the synchronization signal control circuit of FIG.

5 is a waveform diagram showing the synchronous relationship between the output signal of the synchronous signal control circuit, the vertical synchronous signal output from the synchronous signal generating circuit and the video signal output from the image capturing apparatus section when the recording state is shifted.

Fig. 6 is a diagram showing actual recording time that can be actually recorded on a tape when the recording apparatus 1 minute and the recording standby state P minutes are repeated with the same capacity battery for the present apparatus and the conventional apparatus.

7 is a diagram showing discharge characteristics of a NiCd battery battery used in a conventional camera integrated VTR.

8 is a circuit block diagram of a conventional camera integrated VTR.

9 is a transition display diagram of a system operating state of a conventional camera integrated VTR.

10 is a system transition display diagram of another conventional camera integrated VTR.

* Explanation of symbols for main parts of the drawings

1: System control unit 2: Power supply unit

3: imaging device section 4: VTR section

5 imaging unit 7 synchronization signal generating circuit

11: rotating magnetic head 12: drum rotation control circuit

17: position detection device before the drum 20: synchronization signal control circuit

40: start, stop switch 46: optical viewfinder

(The same symbols in the drawings indicate the same or equivalent parts).

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image recording apparatus for capturing an object, converting a subject into an electrical signal, and recording the converted electrical signal on a magnetic tape.

Conventionally, one of the typical image recording apparatuses described above is a camera-integrated VTR.

8 shows a configuration of an example of a conventional camera integrated VTR.

In the drawing, 1 is a system control unit, 2 is a power supply unit for supplying power to each circuit, 3 is an imaging device unit for photographing a subject and converts the photographed subject into an electrical signal, and 4 is an imaging device unit 3 Is a rotating head type magnetic recording and reproducing apparatus section (hereinafter referred to as a VTR section) for recording and reproducing video signals outputted from the?

The imaging device section 3 is composed of an imaging section 5, an electric signal processing circuit 6, and a synchronization signal generating circuit 7. When the subject is picked up by the imaging section 5, the picked up subject is imaged in the charge storage section of the imaging device such as a CCD through the lens of the imaging section 5.

The image of the subject imaged in this charge storage portion is scanned by the synchronization signal generation circuit 7 as a synchronization signal and read out in the form of a continuous electrical signal in time.

The read signal is converted into a normal television signal by the electric signal processing circuit 6, and the television signal is output from the image pickup device section 3. The signal of FIG.

On the other hand, the VTR section 4 is constituted by a video signal recording circuit 8, a video signal reproducing circuit 9, a dream rotation control circuit 12, a tape running control circuit 13 and the like.

The television signal output from the image capture device unit 3 is converted into an FM modulated signal by the video signal recording circuit 8 and rotated through the recording / playback switching switch 10 and a rotary transformer (not shown). Is inputted to and recorded on the magnetic tape by the rotating magnet 11.

In addition, the drum rotation control circuit 12 is a phase comparator 21, phase compensation circuit 14, speed control circuit 15, motor drive circuit 16, drum motor 18 to detect the rotation position of the drum rotation The rotation position detection device 17 is constituted by a speed detection device 19 that detects the rotation speed of the drum motor 18. The drum rotation control circuit 12 configured as described above is made as follows.

That is, the vertical synchronization signal outputted from the imaging device section 3 when recording the image signal on the magnetic tape, and the reference signal from the internal reference signal generation circuit 22 and the drum rotation position detecting device 17 otherwise. Phase comparison with a so-called PG signal, which is a rotation position detection signal in Fig. 2), and phase-compensates the phase error signal output from the phase comparator 21 through the phase compensating circuit 14.

On the other hand, the speed error signal is obtained from the speed control circuit 15 by the speed detection signal obtained from the speed detection device 19, and the speed error signal and the output of the phase compensation circuit 14 are added and the added signal is added. The rotation phase of the rotating drum is controlled by inputting the motor driving circuit 16 to drive the drum motor 18.

In addition, reference numeral 1 denotes a system control unit for controlling the operation of the entire system. In the system control unit 1, various operation switches 44 and various sensors such as start, stop switch 40, standby switch 41, and other sensors are used. The information is obtained at 42, outputs various power control signals and various system control signals, causes the system to be in a predetermined operating state, and causes various display devices 43 to display various operations. The power supply unit 2 supplies power required for each circuit unit by various power control signals from the system control unit 1.

In the electronic viewfinder 45, the reproduction signal of the video signal reproduction circuit 9 is displayed at the time of signal reproduction, and the television signal of the electric signal processing circuit 6 is displayed on the CRT in each case. do. Next, the transition of the system operation state of the conventional apparatus will be described.

9 is a system operation state transition diagram of the camera-integrated VTR shown in FIG.

In Fig. 9, EJECT is a cassette insertion, ejection state STOP is standby, FF is fast tape transfer, REW is reverse fast transfer of tape, PB is playback state of recording signal on tape, and FSRS is in reverse order. Displays the search status of.

In addition, RES is a state in which the photographed subject is recorded on the tape, and REC PAUSE is a recording standby state before the transition to the REC state. Moreover, POWER indicates POWER OFF status.

In the above-described conventional example, a so-called loading standby method is adopted, and when a cassette is inserted, the tape is loaded and waits with the tape wound on the rotating drum (STOP state).

In the STOP state, the supply of power to circuit blocks other than the system control unit 1 is stopped in FIG. When the subject is photographed, the operation state of the system is transferred to REC PAUSE by operating a specific operation key from the outside.

In this state, it is usually necessary to supply power to at least the system controller 1, the imaging device 3, the electronic viewfinder 45, and the drum rotation control circuit 12 required to rotate the rotary drum among the VTR sections 4. have.

Then start in the state of REC PAUSE. When the stop switch 40 is operated, power is supplied to the required circuit block, and tape running is started again, and the signal photographed by the imaging unit 5 is recorded on the tape (REC state).

If the start / stop switch 40 is operated in this REC state, the unit shifts to the REC PAUSE state again and is ready for recording.

In order to reproduce the signal in the STOP state, the operation keys for the reproduction may be operated. Thus, the system control unit 1, the electronic viewfinder 45 and the VTR unit 4, are provided with a circuit block necessary for reproducing the signal on the tape. Power is supplied to reproduce the signal (PB status).

10 is another conventional system operating state transition diagram. This system is intended to simplify operation, and FIG. 9 integrates the REC PAUSE state and the STOP state in the system operation state transition diagram.

In this example, in the STOP state, the recording standby state is always performed, and recording and recording stop of the captured image is performed only by the operation of the start / stop switch 40.

Next, the reason why it is necessary to set the recording standby state when the recording is performed in the conventional camera integrated VTR is explained.

In other words, not only the camera-integrated VTR, but also in the recording and recording apparatus, it is necessary to start recording or recording rapidly by an operation switch from the outside. In particular, the camera-integrated VTR needs to start recording rapidly.

In current camera integrated VTRs, the time required for actually starting recording by operating the start and stop switches is generally about 1 to 2 seconds, which is an acceptable time width for the camera integrated VTR.

Now, a description will be given of an operation method by a person and an operation in the VTR at the time of taking a picture using a conventional camera-integrated VTR.

When shooting, first rotate the subject lens you want to shoot, check the subject image you want to shoot in the viewfinder, and focus manually or automatically.

After the necessary preparations before the start of photographing are finished, the operation keys (start, stop switch) 40 are operated to convey the input information at the start of recording to the camera-integrated VTR. After the start and stop switch 40 is operated, the driving of the magnetic tape is started in the camera-integrated VTR, and the driving of the tape is performed by the tape running control circuit 13 while reproducing the signal recorded on the tape once. Traveling control is performed so that the track trace of the recording signal recorded in step S and the gaze trace described by the magnetic head mounted on the rotating drum coincide with each other.

This is what is called continuous shooting. After the recording track previously recorded matches the scanning trajectory of the magnetic head, actual recording on the tape is started. As described above, in the conventional example shown in FIG. 8, since various operations and operations are required in the face of recording, the imaging apparatus unit is in the recording standby state, that is, the REC PAUSE state of FIG. 9 and the STOP (REC PAUSE) state of FIG. (3) Power is supplied to the electronic viewfinder 45 and the drum rotation control circuit 12, thereby allowing the electronic viewfinder 45 to check the subject image input to the lens on the screen and simultaneously rotating the drum. Is rotated so as to phase-synchronize the sweeping phase of the charge storage unit for accumulating the image of the subject and the rotational phase of the rotating drum.

Therefore, when the start and stop switches 40 are operated in the recording standby state, recording can be started after the time required for continuous shooting (about 1 to 2 seconds) has elapsed.

Such a conventional camera-integrated VTR is usually a portable type and a battery is generally used as a power source when shooting outdoors. At present, the power consumption at the time of shooting in such a camera-integrated VTR is about 6W to 10W, and the battery capacity is set to guarantee a shooting time of about 1 hour in consideration of the appropriate size and weight of the battery shape.

However, in the recording standby state such as the REC PAUSE state shown in FIG. 9 and the STOP (REC PAUSE) state shown in FIG. 10, it is necessary to supply power to most of the devices. If it is set to 100%, it is equivalent to about 80 to 90%. If the recording standby state is continued for a long time, the battery is consumed significantly.

For this reason, studies have been made to stop the supply of power to unnecessary circuit blocks in a range where there is no problem in the operation of the apparatus since there is no room for ordinary photography. That is, when the recording standby state continues for about 3 to 5 minutes, it is considered to automatically transition to the standby state for power saving.

In the standby state, power is supplied only to the circuit portion necessary for recognizing the operating state of the minimum system among the system control units 1.

Normally, standby power consumption is less than 1W. In the standby state, the operation returns to the recording standby state by the operation of the standby switch 41. In the normal operation state, it is generally set to shift to the standby state by the operation of the standby switch 41.

Conventional camera-integrated VTRs are configured as described above, so the power consumption in the recording standby state is large. For example, even if a standby switch is installed, the battery is consumed largely during actual use time, and furthermore, the operation is complicated by installing a standby switch. There was a problem.

In addition, when the recording is resumed by canceling the standby state, the drum is stopped until then, and synchronization with the video signal (synchronization signal) from the image capturing stop section 3 is not performed. Since the drum is difficult to follow, there is a problem that the drum cannot immediately synchronize the phase, and therefore, even if the standby state is released, the signal is not recorded for about 4 to 5 seconds.

The present invention has been devised to solve the above problems, and provides an image recording apparatus in which signal recording can be started with a time delay (about 1 second) without any practical problems thereafter even in a case where the standby state is released. It is intended to be.

An object of the present invention is to provide an image recording apparatus capable of significantly reducing power consumption and eliminating the complexity of operability by a standby standby switch or the like. Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows the configuration of a camera-integrated VTR according to an embodiment of the present invention, where 3 is an imaging device section, and 5 in the imaging device section 3 is a photographing device such as a CCD or the like. The image pickup section 7 to form an image on the charge storage section of the synchronous signal generating circuit generates various synchronous signals such as a vertical synchronous signal, and 6 is scanned by the signal of the synchronous signal generating circuit 7 and read in the form of an electric signal. An electric signal processing circuit converts a signal into a normal television signal.

In addition, 4 is a VTR unit for recording the output signal of the imaging device unit 3 on a track inclined in the longitudinal direction of the magnetic tape by the rotating magnetic head. The VTR 4 is a video signal recording circuit 8 and a video signal. And a regeneration circuit 9, a drum rotation control circuit 12, a tape running control circuit 13, and the like.

The drum rotation control circuit 12 includes a phase comparator 21, a phase compensating circuit 14, a speed control circuit 15, a motor driving circuit 16, and a drum rotation position detecting device 17 for detecting a rotation position of the rotation drum. The drum motor 18 has a speed detecting device 19 and a reference signal generating circuit 22. Furthermore, in this embodiment, a synchronizing signal control circuit 20 is provided.

The synchronizing signal control circuit 20 generates a synchronizing signal of the image capturing stop section 3 due to the rotation position detecting signal obtained from the drum rotation position detecting device 17 and the speed discriminating signal obtained from the speed detecting device 19. The circuit 7 is controlled and constituted by the D-flip-flop circuit 30 and the exclusive OR circuit 31 as shown in FIG.

In addition, 1 is a system control unit which controls the operation of the whole system. The system control unit 1 obtains information from various operation switches 44 and various sensors 42 such as start and stop switches 40, and various power control units. Signals and various system control signals are output, and the system is brought into a predetermined operation state, and various display devices 43 are made to display various types of operation.

Also, the power supply unit 2 is controlled to stop the supply of power to a circuit block other than the system control unit 1 when the recording stop signal is input by the start and stop switch 40. The power supply unit 2 supplies and stops power to the imaging device unit 3 and the VTR unit 4 in response to a power control signal from the system control unit 1.

46 is an optical viewfinder in which several optical lenses are combined. 3 shows the system operation state transition diagram of the camera-integrated VTR of this embodiment, and the system operation state of REC PAUSE, that is, no recording standby state, is different from the conventional example shown in this embodiment and FIG. The other is the same.

The following operation will be described.

When photographing a subject, the optical viewfinder 46 confirms the subject image to be photographed and operates the start and stop switch 40.

The system operation state in which the start / stop switch 40 is operated is shifted from STOP to REC and power is supplied to the imaging device section 3 and the VTR section 4 other than the system control section 1. When the supply of power is started, the drum rotation control circuit 12 starts the drum motor 18 and raises the drum rotation to a constant speed by about 0.3 seconds to 0.5 seconds by the speed control circuit 15.

In the speed detecting device 19, a pulse signal whose frequency is changed by rising to the drum speed in the frequency generator integrally installed in the drum and the frequency is raised to the drum speed in the generated electricity is sent to the speed control circuit 15. At the same time, it is determined that the drum rotation has reached a certain speed. If the speed does not reach the constant speed, the speed discrimination signal, which is a "L" level signal and a "H" level signal when the constant speed is reached, is synchronized to the synchronous signal control circuit 20 To be sent.

The synchronous signal control circuit 20 is constituted by the D-flip flop circuit 30 and the exclusive OR circuit 31 as described above, and the synchronous signal control circuit 20 includes a drum together with the speed discrimination signal. A drum rotation position detection signal (PG pulse) indicating the rotational phase of is input from the drum rotation position detection device 17.

4 shows timing charts of the signal of each part of the synchronization signal control circuit 20 shown in FIG.

4a shows a speed discrimination signal, 4b shows a drum rotation position detection signal, 4c shows an output of the D-flip flop circuit 30, and 4d shows an output signal of the synchronous signal control circuit 20. FIG.

The output signal of this synchronizing signal control circuit 20 is sent to the synchronizing signal generating circuit 7 of the image capturing apparatus unit 3.

The synchronization signal generation circuit 7 is mainly composed of a counter and a logic circuit, and creates various types of timing signals necessary for signal processing such as vertical synchronization signals and horizontal synchronization signals based on a stable clock of high frequency.

5 shows the output signal of the synchronization signal control circuit 20, the vertical synchronization signal output from the synchronization signal generation circuit 7, and the image of the subject accumulated in the charge storage section of the imaging section 5. The synchronization signal generation circuit 7 is shown in FIG. Is a timing signal, and the timing chart of the video signal obtained by signal processing by the electric signal processing circuit 6 is displayed. 5e shows an output signal of the synchronization signal control circuit 20, FIG. 5f shows a vertical synchronization signal, and FIG. 5g shows an image signal.

Accordingly, as shown in FIG. 5, timing signal generation such as a vertical synchronization signal output from the synchronization signal generation circuit 7 in synchronization with the output signal of the synchronization signal control circuit 20 is controlled as shown in FIG. The video signal synchronized with the rotational phase of the drum can be obtained instantaneously.

After that, the time used for continuous shooting, that is, the start. After operating the stop switch 40, it is possible to start recording the recording signal on the magnetic tape after about 1 to 2 seconds.

Here, there are a so-called image pickup tube that is called tube type and a so-called semiconductor image pickup device using a semiconductor such as a MOS type or CCD type.

Since the imaging tube needs to be heated by a heater, a heat time is required for at least 4 to 5 seconds after the power is turned on. In the case of a semiconductor imaging device, it is normal in 0.5 seconds including the time required for stabilization of the electric signal processing circuit 6. It was found that the video signal of was obtained. Therefore, it is very effective to use the semiconductor imaging device as the imaging section 5.

In addition, the optical viewfinder does not require a power supply in particular because it is composed of only the optical lens, as is known.

FIG. 6 shows the tape on the tape when the same battery is used and the recording (REC) is repeated for 1 minute and the recording standby state is set to P minutes when the battery battery capacity is set to guarantee approximately one hour of continuous recording time. The time that can be actually recorded is calculated.

a is the case of the camera integrated VTR according to the present embodiment, and the power consumption in the recording standby state STOP is about 3% of the power consumption in the recording state. b is the case of the conventional camera integrated VTR and the power consumption in the recording standby state (REC PAUSE) is about 94% of the power consumption in the recording state (REC).

In the conventional camera-integrated VTR, when the recording standby state for reducing the actual power consumption continues for about 3 minutes and 5 minutes, the standby mode is automatically executed. In FIG. When set to minutes, the actual recording time on the tape of the conventional camera integrated VTR is about 20 minutes. On the other hand, the camera integrated VTR of this embodiment is about 57 minutes, which proves the effectiveness of the apparatus of this embodiment.

In addition, as described above, the conventional camera-integrated VTR is provided with a power saving standby switch, and if the recording time is longer and lowered on the tape, the standby switch needs to be frequently operated and the operation becomes complicated. In the device, there is no need to install a power saving switch to operate it.

7 shows discharge characteristics of a battery of a NiCd battery commonly used in a conventional camera integrated VTR.

1CmA indicates that the battery can be used for about 1 hour when continuously discharged with 1mA of current consumption.

As apparent from FIG. 7, it will be easily understood that the smaller the discharge amount, the longer the continuous discharge possible time becomes. Or in the conventional camera integrated VTR, it is common for the system control part 1 to use a microprocessor so-called microcomputer.

This microcomputer is usually operated dynamically with a built-in clock, which requires several mA of power consumption in the microcomputer itself. However, depending on the variety, it is possible to set to a static operating state (so-called sleeping mode), and in this case, power consumption of several 10 μA is sufficient, so that the present embodiment device is more effectively used when the operating state is used. do.

As described above, since the supply of power to the circuit blocks other than the system control unit is stopped in the STOP state, the present embodiment device can significantly reduce the power consumption and extend the recording time compared to the conventional device. Since it is not necessary to install the standby switch to operate it, the operability of the device can be improved.

Furthermore, in the present embodiment, the start is synchronized with the rotational phase of the rotating magnetic head due to the predisposition of the image accumulated in the image pickup unit. In the STOP state, the recording (REC) can be started as soon as possible when switching to the REC state.

In addition, in the above embodiment, the rotational speed of the drum reaches a constant speed to control the synchronous signal generating circuit, but the time at which the drum motor reaches the constant speed can be predicted by the characteristics of the loop in the drum rotation control circuit. Therefore, the same effect can be obtained when the means for setting the predetermined time at the time of canceling the power saving state is replaced with the means for discriminating that the constant speed of the embodiment has been reached.

In the above embodiment, the camera-integrated VTR has been described with reference to the present invention, but the effectiveness of the present invention is not changed even when the camera (photographer) and the VTR (recorder) are separated.

Claims (17)

The recorder 4 which captures the subject and converts it into an electrical signal, records the output signal of the imager on a track inclined in the longitudinal direction of the magnetic tape, and a start switch 40 which starts recording of the recorder. And a power supply circuit (2) for supplying power to the imager (3) and the recorder (4) when this start switch is operated. 2. The image pickup device (3) according to claim 1, wherein the image pickup unit (3) obtains the image picked up by the image pickup means (5) of the image pickup means (7). And a converting means (6) for converting the electric signal into the synchronizing signal. An image recording apparatus according to claim 2, wherein said image pickup means (5) is constituted by using a semiconductor image pickup device. 4. An image recording apparatus according to claim 3, wherein an image of a subject formed in the charge storage portion of said semiconductor image pickup device is scanned with a synchronization signal obtained by said synchronization signal generating means (7) and read out in a signal waveform that is continuous in time. The video recording apparatus according to claim 2, wherein said converting means (6) converts the output signal of said imaging means into a television signal in accordance with a synchronizing signal obtained from said synchronizing signal generating means (7). The drum recorder (4) according to claim 1, wherein the recorder (4) has a drum rotation control means (12) for controlling the rotation of the drum motor by a drum motor (18) in which a rotating drum having a magnetic head (11) drives the rotating drum. Video recording device provided. The image pickup apparatus (3) according to claim 6, wherein the drum rotation control means (12) is based on rotation position detection means (17) for detecting the rotation position of the rotation drum, and rotation position detection signal obtained by the rotation position detection means. And synchronizing signal control means (20) for controlling the (3) and starting the stamp of the subject accumulated in the imager in synchronization with the rotational phase of the rotating drum. The synchronizing signal control means (20) according to claim 7, wherein the synchronizing signal control means (20) is a temporary memory device to which the speed discriminating signal of the rotating drum and the rotation position detecting signal obtained from the rotating position detecting means (17) are input, and the output signal of the temporary memory device. And a logic element for inputting the speed discrimination signal to output a synchronous control signal to the imager (3). 9. An image recording apparatus according to claim 8, wherein said temporary memory element is composed of a D-type flip-flop circuit (30). 9. An image recording apparatus according to claim 8, wherein said logic element is composed of an exclusive OR circuit (31). The imaging device (3) and the recorder (4) according to claim 1, wherein the power supply circuit (2) supplies power capable of immediately shifting to a recording state without stopping the recording standby state in the stop state when the start switch 40 is operated. Video recording device. 12. An image recording apparatus according to claim 11, wherein said power supply circuit (2) is constructed using a battery cell. Imaging means (5) for imaging a subject Synchronization signal generating means (7) for generating a predetermined synchronization signal The synchronization signal generating means (7) and the imaging means (5) for a subject photographed by the imaging means (5). Conversion means (6) for converting the photographed subject into electrical signals in accordance with the synchronization signal obtained by the synchronization signal generation means (7), and recording the output signal of the conversion means on a track inclined in the longitudinal direction of the magnetic tape; The rotating magnetic head 11, the rotating drum on which the rotating magnetic head is mounted, the rotating position detecting means 17 for detecting the rotating position of the rotating drum, and the rotating position detecting signal obtained from the rotating position detecting means And a synchronizing signal control means (20) for controlling the signal generating means (7) and initiating the sweep accumulated in the imaging means (5) in synchronization with the rotational phase of the rotating drum. The synchronizing signal control means (20) according to claim 13, wherein the synchronizing signal control means (20) receives the speed discrimination signal of the rotating drum and the rotation position detecting signal obtained from the rotation position detecting means (17) to synchronize the control signal generating means (17). An image recording apparatus comprising a logic circuit for outputting a signal. 15. The exclusive OR circuit 31 of claim 14, wherein the D flip-flop circuit 30, to which the speed discrimination signal and the rotation position detection signal are input, receives the output signal of the flip-flop circuit and the speed discrimination signal. And a video recording device. 15. The video recording apparatus according to claim 14, wherein the speed discrimination signal is configured to indicate that the rotation speed obtained by the speed detection device (19) for detecting the rotation speed of the rotation drum has reached a predetermined speed. 15. The image recording apparatus according to claim 14, wherein the speed discrimination signal is generated when a predetermined time elapses from the rotation start time of the rotating drum.

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