JPH08185651A - Magnetic tape recording/reproducing device - Google Patents

Abstract

PURPOSE: To attain long time use of a reproducing device by battery drive by lowering the rotational speed of a capstan motor according to kinds of a power source in a power source part and the remaining power of a battery as the power source. CONSTITUTION: When a command turning on the display of a monitor display part 26 is inputted to a microcomputer 27 by an operation key provided on an operation part 28, a capstan double speed setting part 22 is controlled, and the rotational speed of the capstan motor 15 at a high speed mode time is lowered. Similarly, the control lowering the rotational speed of the capstan motor 15 is performed in the high speed mode according to the kinds of the power source and the remaining power of the battery by the power source setting key of the operation part 28 or the output of a power source kind decision part 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention reduces power consumption by lowering the rotation speed of a capstan motor, for example, when a monitor image is displayed on a monitor display portion, or according to the type of a battery serving as a power source and the degree of consumption thereof. The present invention relates to a magnetic tape recording device or a magnetic tape reproducing device (hereinafter referred to as a magnetic tape recording / reproducing device) that can be realized, and particularly to a magnetic tape recording / reproducing device suitable for a video camera integrated with a display monitor. .

[0002]

2. Description of the Related Art Recently, an integrated compact video camera equipped with, for example, a 3-inch compact color liquid crystal monitor and capable of recording / reproducing has been put into practical use. This small liquid crystal monitor can monitor a subject to be photographed like the viewfinder, and can replay the photographed image on the spot. In addition, such a video camera with an integrated liquid crystal monitor can be driven by various batteries such as a Li-ion battery, a NiCd battery, and a dry battery in addition to a commercial AC power source, and thus is suitable for outdoor photography.

[0003]

By the way, the video camera integrated with a liquid crystal monitor has an advantage that it is possible to monitor an image to be taken on a screen larger than the viewfinder by providing the liquid crystal monitor. The power consumption is considerably higher than that of a general video camera due to the projection. Therefore, when it is driven by the above-mentioned various batteries, the battery is significantly consumed and it is difficult to use it for a long time.

[0004]

The present invention has been made in order to solve such a problem, and for example, when the display of the monitor display section is on, and when the power source is a battery or the battery The present invention realizes a magnetic tape recording / reproducing apparatus for reducing power consumption by reducing the rotation speed of a capstan motor in a high speed mode such as fast forward / rewind, fast forward reproduction / rewind reproduction according to the remaining amount.

As a magnetic tape recording / reproducing apparatus according to claim 1, at least video information is recorded on a magnetic tape,
Alternatively, in a magnetic tape recording / reproducing apparatus for reproducing recorded video information, a power source type discriminating means for discriminating the type of external power source supplied to the magnetic tape recording / reproducing apparatus,
Magnetic tape running control means for changing the running speed of the magnetic tape, and when the external power source supplied by the power source type determining means is a battery, the magnetic tape running control means fast forwards / winds. A magnetic tape recording / reproducing apparatus is provided with control means for controlling the rewind and fast-forward reproduction / rewind reproduction tape speeds to be lower than the standard fast-forward / rewind and fast-forward reproduction / rewind reproduction tape speeds.

As a magnetic tape recording / reproducing apparatus according to a second aspect, at least video information is recorded on a magnetic tape,
Alternatively, in a magnetic tape recording / reproducing apparatus having a display device for reproducing the recorded video information and monitoring the recording information or the reproducing information, the type of external power supply supplied to the magnetic tape recording / reproducing apparatus is determined. External power supplied by the power source type determining means, the power source type determining means, the magnetic tape running control means for changing the running speed of the magnetic tape, and the switching means capable of controlling ON / OFF of the display device. When it is determined that the power source is a battery, or when the display device is driven to the on state, the magnetic tape running control means fast forwards / rewinds and fast forwards / rewinds the playback tape speed at the standard time. / Rewind and fast forward playback / rewind playback magnetic tape recording / reproducing is provided with control means for controlling the tape speed to be lower than the tape speed. Configuring devices.

As a magnetic tape recording / reproducing apparatus according to a third aspect, the magnetic tape recording / reproducing apparatus is constituted by a portable video camera device having a liquid crystal display device.

In the magnetic tape recording / reproducing apparatus according to the fourth aspect, the traveling speed of the magnetic tape is changed by changing the frequency division ratio of the frequency dividing circuit provided in the capstan rotation servo system. Thus, the magnetic tape recording / reproducing apparatus is configured.

[0009]

According to the present invention, power is saved by lowering the rotation speed of the capstan motor in response to a monitor image being displayed on the monitor display section, the type of battery used as a power source, and the level of consumption of the battery. Therefore, the battery life can be extended.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the magnetic tape recording / reproducing apparatus of the present invention will be described below with reference to FIGS. In this embodiment, a small 8 mm video camera with an integrated liquid crystal monitor is used.

FIG. 1 is a diagram showing a partial circuit block of the 8 mm video camera of the embodiment. In the figure, 1 is a power supply unit to which power is supplied from the outside, such as a commercial AC power supply,
It is composed of various batteries such as a Li-ion battery, a NiCd battery, and a dry battery. That is, the power supply unit 1 is provided with a power supply jack of a commercial AC power supply and a mounting portion for a storage case for various batteries such as a Li-ion battery, a NiCd battery, and a dry battery so that power is supplied from the outside.

Reference numeral 2 denotes a power source type discriminating unit for discriminating the type of power source provided for the power source unit 1. As a method of discriminating the power source, for example, a switch for detecting the connection state of the power source jack or the mounting state of the storage case is mechanically provided on the power source unit 1, or the voltage supplied from the power source unit 1 is used. The type of power supply is determined by the value. Further, the power source type determination unit 2 can detect the remaining amount when the power source in the power source unit 1 is the above various batteries.

Reference numeral 3 surrounded by a broken line indicates a servo control circuit for controlling the capstan motor and the drum motor. For example, a drum servo operation unit 4, a capstan servo operation unit 5, a capstan speed detection unit 6, and a capstan phase detection unit. 7, a drum speed detection unit 8, a drum phase detection unit 9 and the like. Reference numeral 10 denotes a voltage control unit configured by a drum motor voltage control unit 11 that generates a drive voltage for the drum motor and a capstan motor voltage control unit 12 that generates a drive voltage for the capstan motor. The drum motor voltage control unit 11 generates a drive voltage according to the error amount based on the rotation servo error signal supplied from the drum servo calculation unit 4. Similarly, the capstan motor voltage control unit 12 generates a drive voltage according to the error amount based on the rotation servo error signal supplied from the capstan servo calculation unit 5.

Reference numeral 13 denotes a drum motor driver for driving the drum motor at a predetermined speed in response to a drive signal supplied from the drum motor voltage control unit 11, and 14 denotes a drive voltage supplied from the capstan motor voltage control unit 12. Shows a capstan motor driver that drives the capstan motor at a predetermined speed. Reference numeral 15 denotes a capstan motor for running the magnetic tape at a predetermined speed, which outputs a rotation speed detection signal FGc and supplies rotation information to the capstan motor driver 14. 1
Reference numeral 5 denotes a drum motor for rotating the rotary head HD at a predetermined speed, which outputs a rotation speed detection signal FGd and a rotation phase detection signal PG, and the drum motor driver 1
3 is supplied with rotation information.

Reference numeral 17 denotes a sensor amplifier including amplification waveform shaping sections 18 and 19. The amplified waveform shaping unit 18 shapes the rotation speed detection signal FGc supplied from the capstan motor 15 into a square wave and supplies the square wave to the capstan speed detection unit 6. Further, the amplified waveform shaping section 19 shapes the waveforms of the rotation speed detection signal FGd and the rotation phase detection signal PG supplied from the drum motor 16 and supplies them to the drum phase detection section 9.

The drum speed detector 8 and the drum phase detector 9 detect the rotation speed and the rotation phase of the drum motor 16 from the rotation speed detection signal FGd and the rotation phase detection signal PG whose waveforms have been shaped by the amplification waveform shaping unit 19. The detection result is supplied to the drum servo calculation unit 4. Then, the drum servo calculation unit 4 generates a drum rotation servo error signal according to the detection result. Then, the applied voltage of the drum motor driver 13 is controlled according to the drum rotation servo error signal calculated by the drum servo calculation unit 4 so that the drum motor 16 rotates at a constant phase and rotation cycle. Controlled.

Similarly, the capstan speed detecting section 6 has a rotation speed detecting signal FGc supplied from the amplified waveform shaping section 18.
Then, the rotation speed of the capstan motor 15 is detected. Further, the capstan phase detector 7 detects the rotational phase difference with the capstan motor 15 from the rotational phase detection signal PG supplied from the tracking error detection circuit 21. Capstan speed detector 6 and capstan phase detector 7
The detection result of is supplied to the capstan servo operation unit 5,
A capstan rotation servo error signal is generated according to this detection result. Then, the drive signal of the capstan motor driver 14 is controlled according to the capstan rotation servo error signal calculated by the capstan servo calculation unit 5, and the capstan motor 15 is controlled so as to have a predetermined tape running speed. .

Reference numeral 20 is a head amplifier for amplifying a reproduction signal read by the rotary head HD, and 21 is a head amplifier 20.
ATF (Automatic Track) from the playback signal supplied from
Following) signal is detected and a tracking error detection unit for detecting a tracking error from the ATF signal is shown. The tracking error signal detected by the tracking error detector 21 is supplied to the capstan phase detector 7 described above.

Reference numeral 22 denotes a capstan double speed setting unit, which is, for example, fast forward (FF) / rewind (REW), fast forward reproduction (CUE) / rewind reproduction (RE) as will be described later with reference to FIG.
The rotation speed of the capstan motor 15 at V) is set. In the present invention, for example, the type of power source determined by the power source type determination unit 2 (commercial AC power source, Li-ion battery, NiCd
(Batteries, dry batteries, etc.), the remaining amount of various batteries, or the ON / OFF state of the monitor display unit described later, the rotation speed of the capstan motor 15 is changed to save power. Reference numeral 23 denotes a servo input circuit including a frequency divider, which sets a predetermined frequency division ratio according to the setting of the capstan double speed setting unit 22 and sets the rotation speed setting signal F of the capstan motor 15.
The Gr is supplied to the capstan servo calculation unit 5.

Reference numeral 24 is an image pickup block including, for example, a CCD and a lens block, 25 is a video processing unit for performing necessary video processing on a video signal output from the image pickup block 24, 2
Reference numeral 6 denotes a monitor display unit composed of, for example, a small color liquid crystal panel, which can switch and monitor a video signal reproduced by the head amplifier 20 and a subject input to the imaging block 24. This monitor display unit 26
ON / OFF can be switched by a user's manual operation.

Reference numeral 27 denotes a control microcomputer for performing various controls such as on / off of the monitor display unit 26 and the capstan double speed setting unit 22, and 28 denotes, for example, a display on / off key of the monitor display unit 26, reproduction, fast forward (FF) / Rewind (REW), fast forward playback (CUE) / rewind playback (RE
V) and other various operation keys and a power source setting key for setting the type of power source in the power source unit 1 are provided, and various commands input by the user are supplied to the control microcomputer 27.

In the case of the present invention, the control microcomputer 2
When a command for turning on the display of the monitor display unit 26 is input by an operation key provided on the operation unit 28, the capstan motor 7 controls the capstan double speed setting unit 22 to rotate the capstan motor 15 in the high speed mode. Try to slow it down. Similarly, according to the power setting key of the operation unit 28 or the output of the power source type determination unit 2, for example, when the type of power source is any of the above-mentioned batteries or according to the remaining amount of the battery, the capstan in the high speed mode is Control is performed to reduce the rotation speed of the motor 15.

FIG. 2 is a diagram schematically showing the pulse cycle of the rotation speed setting signal FGR supplied to the circuit servo system in order to reduce the rotation speed of the capstan motor. In addition,
Here, the rotation speed detection signal FGc during reproduction will be described as a reference signal. In this figure, (a) shows the waveform of the rotation speed detection signal FGc at the time of reproduction, which serves as a reference signal, for example. On the other hand, for example, the waveform shown in (b) is
The pulse period is twice that of the rotation speed detection signal FGc shown in (a). That is, the rotation speed detection signal F
When Gc is detected as shown in (b), it means that the rotation of the capstan motor 15 is 1/2. When such a waveform is input to the capstan speed detection unit 6, the capstan servo calculation unit 5 performs a calculation process for doubling the rotation speed of the capstan motor 15, and the capstan motor voltage control unit. At 12, an applied voltage that accelerates the capstan motor 15 is generated.

Although not shown, the pulse cycle of the rotation speed detection signal FGc is 1 of the pulse cycle shown in (a).
When it becomes / 2, an applied voltage for decelerating the capstan motor 15 is generated so as to reduce the rotation speed of the capstan motor 15 to 1/2. That is, when the rotation speed of the capstan motor 15 deviates from the predetermined speed (acceleration or deceleration), the pulse cycle of the rotation speed detection signal FGc also changes, and when the cycle of the rotation speed detection signal FGc becomes long, the acceleration speed is increased. When the applied voltage is shortened, the applied voltage for deceleration is generated.

By the way, (c) is a normal fast-forward (FF)
FIG. 10 is a diagram showing a pulse cycle at the time of rewinding (REW),
The pulse period is, for example, 15 times as long as the rotation speed detection signal FGc at the time of reproduction shown in (a). In other words, if the pulse period shown in (c) is generated as the rotation speed setting signal FGr and given to the capstan servo calculation unit 5, the capstan motor 15 will rotate at a speed 15 times faster than the above reason. In the present invention, normally, 15-fold speed fast forward (FF) / rewind (REW) is performed by the rotation speed setting signal FGr having the pulse period shown in (c). However, for example, when the display of the monitor display unit 26 is on,
Alternatively, when the type of power supply in the power supply unit 1 is various batteries, or when the remaining amount of each battery decreases, the servo input circuit 23 causes fast forward (FF) / rewind (REW).
The division ratio is set so as to reduce the rotation speed of the capstan motor 15 at that time.

For example, as an example, the frequency division ratio is 2 /
The rotation speed setting signal FGr having a pulse cycle of 10 times as shown in (d) is generated by setting 3 and fast forward (FF) / rewind (REW) is performed at 10 times speed.
As a result, the rotational speed of the capstan motor 15 at the time of fast-forwarding (FF) / rewinding (REW) can be reduced to 2/3 and power saving can be achieved.

(E) is a diagram showing a pulse cycle during normal fast-forward reproduction (CUE) / rewind reproduction (REV),
The pulse period is, for example, eight times as long as the rotation speed detection signal FGc at the time of reproduction shown in (a). That is, the rotation speed setting signal F when the fast forward reproduction in the forward and reverse directions is performed at 8 times is performed.
It is Gr. Further, (f) shows the rotation speed setting signal FGr, which is also set to have a pulse period of 6 times. Also when performing fast forward reproduction (CUE) / rewinding reproduction (REV), for example, when the display of the monitor display unit 26 is turned on or the type of power source in the power supply unit 1 is various batteries, or the remaining amount of various batteries decreases. In this case, the servo input circuit 23 sets the frequency division ratio to, for example, 2/3 of the normal state to generate the rotation speed setting signal FGr shown in (f), and fast-forwards (F
F) / Rewind. As a result, the rotational speed of the capstan motor 15 at the time of fast-forwarding (FF) / rewinding (REW) can be reduced to 2/3 and power saving can be achieved.

Therefore, according to the present invention, by giving the rotation speed setting signal FGr which is obtained by dividing the pulse period of the rotation speed detection signal FGc at the time of reproduction by 1 / n, fast-forward reproduction (C
(UE) / rewinding reproduction (REV), the rotational speed of the capstan motor 15 can be set to an arbitrary double speed, and power can be saved.

In the following, according to the flow chart shown in FIG. 3, fast forward (FF) / rewind (RE) according to the present invention.
W) and fast forward playback (CUE) / rewind playback (REV)
A flow of processing when the rotation speed of the capstan motor 15 is lowered will be described. Fast forward (FF) here
/ Rewind (REW) and fast forward reproduction (CUE) / rewind reproduction (REV) will be described as a high speed mode. First, when the high speed mode is selected by operating the operation keys of the operation unit 28 (S001), it is determined whether or not the display of the monitor display unit 26 is ON (S002). If the monitor display unit 26 is off, the process proceeds to step S003, and it is determined whether the power source in the power source unit 1 is a battery. Here, if it is determined that the power source is a commercial AC power source or the like, which is not a battery, the frequency division ratio at which the capstan motor 15 becomes the rotation speed in the normal high speed mode is set (S004), and the high speed mode is executed. (S008).

If it is determined in step S002 that the display on the monitor display unit 26 is on, and if it is determined in step S003 that the power source is a battery, it is determined in step S005 which high speed mode is selected. . Then, when it is determined that the high speed mode is fast forward (FF) / rewind (REW), the frequency division ratio is set to 2/3 of the normal frequency in the servo input circuit 23 (S006). 10) The rotation speed setting signal FGr of 10 times speed is generated to execute the high speed mode (S008). When it is determined that the high speed mode is the fast forward reproduction (CUE) / rewind reproduction (REV), the servo input circuit 23 sets the frequency division ratio to the normal 3
/ 4 is set (S007), the 6 × rotation speed setting signal FGr shown in FIG. 2 (f) is generated, and the high speed mode is executed (S008).

When it is determined in step S003 that the power source is a battery, various types of batteries (for example, Li ion, NiCd,
The rotation speed of the capstan motor 15 in the high speed mode may be set according to the performance of the dry battery or the like. Similarly, when it is determined in step S003 that the power source is a battery, the rotation speed of the capstan motor 15 is described in the present embodiment according to the remaining battery level detected by the power source type determination unit 2. It is also possible to set the frequency division ratio so that the speed becomes lower than the double speed and the 6 × speed.
In other words, the frequency division ratio set by the servo input circuit 23 may be in a range that does not cause the user who operates the device to feel much inconvenience.

The present invention extends the life of the battery by switching the rotation speed of the capstan motor 15 depending on the on / off state of the liquid crystal display device, the type of the battery, the remaining amount of the battery, etc. to save power. It becomes possible to extend the usage time of the 8 mm video camera when various batteries are used.

In this embodiment, the capstan motor 1 is used when, for example, a battery is used as a power source, when the remaining amount is low, or when the display on the monitor display unit 26 is on.
Although the example of lowering the rotation speed of No. 5 has been described, the power saving mode may be set to OFF, or the user may select to always be in the power saving mode. Further, as the magnetic tape running means for changing the running speed of the magnetic tape, in addition to controlling the capstan motor 15 by the capstan servo operation unit 5 described in the present embodiment, for example, the applied voltage of the capstan motor driver 14 is applied. May be controlled. In addition to the 8 mm video camera shown in the embodiment, the present invention can be applied to, for example, a small VHS video camera, a general playback device without a display device, a recording image, and the like.

[0034]

As described above, according to the magnetic tape recording / reproducing apparatus of the present invention, the rotational speed of the capstan motor is changed according to, for example, the type of power source in the power source section and the remaining battery level. Since it can be lowered, power saving can be achieved. As a result, the life of various batteries can be extended, and it becomes possible to realize long-term use of the playback device driven by the batteries. Even when the magnetic tape recording / reproducing apparatus is integrally provided with a monitor display unit such as a liquid crystal panel that increases power consumption, the capstan motor is activated when the display on the monitor display unit is turned on. There is an advantage that the rotation speed of the battery can be reduced to extend the life of the battery.

[Brief description of drawings]

FIG. 1 is a diagram showing a partial circuit block when the present invention is applied to an 8 mm video camera.

FIG. 2 is a diagram schematically showing a rotation speed setting signal FGr for reducing the rotation speed of a capstan motor.

FIG. 3 is a flowchart showing a process for reducing the rotation speed of a capstan motor.

[Explanation of symbols]

 1 power supply unit 2 power supply type determination unit 3 servo control 4 capstan servo calculation unit 15 capstan motor 22 capstan double speed setting unit 23 servo input circuit 26 monitor display unit 27 control microcomputer 28 operation unit

Claims (4)

[Claims] 1. A magnetic tape recording / reproducing apparatus for recording video information on at least a magnetic tape or reproducing the recorded video information, wherein the type of an external power source supplied to the magnetic tape recording / reproducing apparatus is determined. A magnetic tape running control means for changing the running speed of the magnetic tape; and when the external power supplied by the power source type judging means is a battery, the magnetic tape Fast forward / rewind and fast forward playback /
A magnetic tape recording / reproducing apparatus comprising control means for controlling the rewinding / reproducing tape speed to be lower than the standard fast-forward / rewind and fast-forward reproducing / rewinding tape speeds. 2. A magnetic tape recording / reproducing apparatus, comprising at least a display device for recording video information on a magnetic tape or reproducing the recorded video information and monitoring the recorded information or the reproduction information. Power source type determining means for determining the type of external power source supplied to the tape recording / reproducing device, magnetic tape running control means for changing the running speed of the magnetic tape, and switching for enabling the display device to be turned on / off. When the external power source supplied by the power source type determining means is a battery, or when the display device is driven to the on state, the magnetic tape running control means fast-forwards. / Rewind and fast-forward playback / Rewind playback tape speed is lower than standard fast-forward / rewind and fast-forward playback / rewind tape speed Magnetic tape recording / reproducing apparatus control means for controlling to is characterized in that it is provided. 3. The magnetic tape recording / reproducing device according to claim 2, wherein the magnetic tape recording / reproducing device is a portable video camera device equipped with a liquid crystal display device. 4. The method according to claim 1, wherein the running speed of the magnetic tape is changed by changing a frequency division ratio of a frequency dividing circuit provided in the capstan rotation servo system. The magnetic tape recording / reproducing apparatus according to claim 2 or claim 3.