JPH11134773A - Battery driven recording/reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the consumption of a battery so as to obtain a VTR integral camera used for a long time by providing a power generating means connected to a driving system for driving a medium and charging the battery by power generated by this power generating means. SOLUTION: For rewinding or fast-forwarding a video cassette tape in a VTR part 10, power generators 2 and 4 coaxial to a winding reel 1 and a feeding reel 3 are actuated to generate AC voltages E1 and E2. A mixer 5 forms an AC voltage E3 by synthesizing the AC voltages E1 and E2, and a flow-rectifying circuit 6 converts the AC voltage E3 into a DC voltage ED1 and outputs the same. A reverse-flow preventing circuit 7 charges a battery 8 only by the DC voltage ED1, prevents the reverse-flowing of a current from the battery 8, and a power supply circuit 9 supplies a voltage from the battery 8 to the respective motors 19 of a cameral part 11 and the VTR part 10. Thus, the device is miniaturized without using any solar batteries or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery-driven recording / reproducing apparatus for recording or reproducing a signal on a medium.

[0002]

2. Description of the Related Art There is a battery-driven recording / reproducing apparatus of this kind which is driven by a battery so that it can be carried and used. For example, a mini-disc (MD) for recording or reproducing an audio signal on or from a disk, or a disk. A compact disk (CD) for reproducing an audio signal, a handy type video tape recorder (hereinafter, referred to as a VTR) for recording or reproducing a video signal on a magnetic tape, a tape recorder for recording or reproducing an audio signal on a magnetic tape, and the like. is there.

As a handy type VTR, for example, there is a VTR integrated camera in which a VTR section and a camera section are integrated. A conventional VTR integrated camera is disclosed in
No. 7,359,739 is known.

In a conventional VTR integrated camera, as shown in FIG. 4, a battery 22 supplies power to a power supply 23, and this power drives a VTR unit 24 and a camera unit 25.

[0005] In order to extend the use time of the main body of the VTR-integrated camera in order to suppress the consumption of the battery 22,
A generator 20 or a solar cell 21 is provided. The generator 20 generates power in accordance with the swing motion of a swing gear 26 resulting from the swing of the VTR-integrated camera body, and charges the battery 22 with this power.

[0006] The solar cell 21 is used to charge the battery 22 by generating power using light energy.

[0007]

As described above, in order to extend the use time of the VTR-integrated camera, a large-capacity battery must be used or the oscillating gear 26 or the solar cell 2 must be used.
It is necessary to generate electric power in step 1 and charge the electric power to the battery 22 so as to suppress the power consumption of the battery 22.

Further, there is a problem that a space for disposing them in a VTR integrated camera is required. An object of the present invention is to provide a battery-driven recording / reproducing apparatus configured to charge a battery with electric power generated by a power generation unit connected to a drive system that drives a medium.

[0009]

A battery-driven recording / reproducing apparatus according to the present invention comprises a power generating means connected to a drive system for driving a medium, and charges the battery with the power generated by the power generating means. Things.

According to the present invention, the power consumption of the battery is reduced by charging the battery with the power generated by the power generation means connected to the drive system for driving the medium without requiring power generation by a large-capacity battery or an oscillating gear. Can be suppressed.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is a battery-driven recording / reproducing apparatus for recording or reproducing a signal on a medium by supplying electric power of a battery to a medium driving unit. A battery-driven recording / reproducing apparatus configured to charge the battery with the power generated by the power generation means, the power generation means being connected to a drive system for driving the battery. The battery consumption can be suppressed without the need for power generation by the battery.

According to a second aspect of the present invention, there is provided a battery-driven recording / reproducing apparatus for recording or reproducing a signal on or from a magnetic tape by supplying electric power of a battery to a tape traveling drive unit. A battery-driven recording / reproducing apparatus comprising a power generation means connected to at least one of a system or a take-up reel drive system, wherein the power generated by the power generation means is charged into the battery. The power can be generated by power generation means connected to at least one of the system or the take-up reel drive system.

According to a third aspect of the present invention, there is provided a battery-driven recording / reproducing apparatus for recording or reproducing a signal on a magnetic tape by supplying electric power of a battery to a tape traveling drive unit. A battery-driven type, comprising: a power generating means connected to a system and a take-up reel drive system, respectively, and a mixer for synthesizing an output of the power generating means, and configured to charge the battery with power generated by the power generating means. This is a recording / reproducing device.

According to a fourth aspect of the present invention, there is provided a battery-driven recording / reproducing apparatus for recording or reproducing a signal on a magnetic tape by supplying electric power of a battery to a tape traveling drive unit. A power generating means for generating power is provided in at least one of the system and the take-up reel drive system, and when one of the reel drive systems is driven, the other reel drive system is driven to generate power. This is a battery-driven recording / reproducing apparatus in which power consumption is suppressed. When one of the reel driving systems is driven, the other reel driving system is driven to generate electric power.

According to a fifth aspect of the present invention, there is provided a battery-driven recording / reproducing apparatus for recording or reproducing a signal on a magnetic tape by supplying electric power of a battery to a tape traveling drive unit. The system and the take-up reel drive system each include a power generation means, and a switch connected to the output side of the power generation means that is generating power, and one reel drive system is driven to drive the other reel drive system. The battery-driven recording / reproducing apparatus in which the power is generated and the battery is charged with this power to reduce the power consumption of the battery.

Hereinafter, a battery-driven recording / reproducing apparatus according to the present invention will be described based on specific embodiments. In addition,
Here, a case of a VTR integrated camera will be described as an example.

(Embodiment 1) V in Embodiment 1
As shown in FIG. 1, the TR-integrated camera includes a mixer 5, a rectifier circuit 6, a backflow prevention circuit 7, a battery 8, a power supply circuit 9, a VTR unit 10, and a camera unit 11.

The power of the battery 8 is supplied to the camera unit 11 and each motor 19 of the VTR unit 10 through a power supply circuit 9. The VTR unit 10 includes a take-up reel 1, a generator 2 provided on the take-up reel 1, a supply reel 3, a generator 4 provided on the supply reel 3, and a motor 19.

The operation of the generator 2 or the generator 4 is shown in FIG.
Description will be made using a basic circuit of a motor as shown in FIG. The applied voltage of the battery 8 is Vt, and the armature current is I
a, armature resistance Ra, DC motor M ₀ Is the induced electromotive force of Ea, the generated torque of the motor is T, the load torque is TL,
When the magnetic flux per magnetic pole is Φ and the rotation speed of the motor is Wm, (Equation 1) to (Equation 3) are established from the voltage equation of the circuit and the basic equation of the motor.

Vt = Ia × Ra + Ea (Equation 1) Ea = Ka × Φ × Wm (Equation 2) T = Ka × Φ × Ia (Equation 3) where Ka is a constant. , The number of pole pairs is P, the number of conductors of the armature is Z, and the number of armature circuits is A (Expression 4).

Ka = P × Z / (2π × A) (Equation 4) When Ea is eliminated by substituting (Equation 2) into (Equation 1), Wm = (Vt−Ia × Ra) / ( Ka × Φ) ‥‥‥ (Equation 5) The relational expression between the rotational speed Wm of the motor and the load torque TL is:
It is expressed by (Equation 6) from (Equation 3) and (Equation 5).

Wm = Vt / (Ka × Φ) −Ra × TL / (Ka × Φ)^Two‥‥‥ (Equation 6) where DC motor M₀ Role of generator as power generation means
DC motor M₁ Are connected as shown in FIG.
In this case, the load torque TL is increased by (Equation 6).
The rotation speed Wm of the motor decreases. Therefore,
DC motor M serving as electric machine₁ Consider the incremental load of
The magnetic flux per magnetic pole is determined and the rotational speed Wm of the motor is determined.
Without lowering the applied voltage Vt and the armature current Ia.
Motor M acts as a generator without changing power₁ Attach
Can be

A DC motor M ₀ rotating at a rotation speed Wm DC motor M ₁ acting as a generator with the power of The electromotive force Eb generated by is expressed by (Equation 7). Eb = Ka × Φ × Wm (Equation 7) DC motor M ₁ serving as this generator Is used for charging the battery 8.

That is, the DC motor M ₀ The power consumption of the DC motor M ₁ acts as a generator DC motor M ₁ which is the same regardless of the presence or absence of Is supplied to the battery 8 as a result, the DC motor M ₀ Power consumption can be suppressed.

The operation of the VTR unit 10 for rewinding a video cassette tape for recording and reproducing video signals will be described. When the video cassette tape is wound by the VTR unit 10, the take-up reel 1 rotates in a direction in which the tape is wound. An AC voltage E1 is generated by operating the generator 2 disposed on the concentric axis by the rotation torque of the take-up reel 1.

Further, since the supply reel 3 is rotated at the same time as the winding operation, the generator 4 is also operated, and the generator 4 operates to generate an AC voltage E2. Due to the difference between the amount of tape on the take-up reel 1 and the amount of tape on the supply reel 3, the rotation speeds of the take-up reel 1 and the supply reel 3 hardly match, so that the frequency of the AC voltages E1, E2 generated at this time is Almost no match.

The two AC voltages E1 and E2 are supplied to a mixer 5
To form an AC voltage E3. The waveform of the AC voltage E3 has a distorted shape because the AC voltages E1 and E2 having different frequencies are synthesized and formed.

This mixer 5 is a circuit for synthesizing the power generated in the winding and fast-forward operations without waste.
The AC voltage E3 from the mixer 5 is converted into a DC voltage D by the rectifier circuit 6.
Convert to 1.

In the backflow prevention circuit 7, the battery 8 is charged only with the DC voltage D1 from the rectifier circuit 6.
This prevents the current from flowing back. The voltage from the battery 8 is passed through the power supply circuit 9 to the camera unit 11 and V
It is supplied to the TR unit 10.

In the case of the operation for fast-forwarding the video cassette tape by the VTR section 10, the take-up reel 1 rotates with the rotation of the supply reel 3, and the power is generated and supplied to the battery 8 in the same manner as described above. Is what you do.

As described above, when the VTR unit 10 rewinds or fast-forwards the tape, the mixer 5 combines the AC voltages obtained by the generators provided on the respective reels and combines the AC voltages. Rectifying the battery 8 and charging the battery 8, power consumption by a large-capacity battery or an oscillating gear is not required, and battery consumption can be suppressed.

In the first embodiment, the generator is provided on the supply reel and the take-up reel. However, it is also effective to provide the power generating means on a rotating system such as a cylinder. (Embodiment 2) A VTR integrated camera according to Embodiment 2 has a VTR section 10 and a camera section 1 as shown in FIG.
1, a switch 14, a rectifier circuit 15, a backflow prevention circuit 16, a power supply circuit 17, and a battery 18.

The VTR unit 10 includes a motor-integrated take-up reel 12 and a motor-integrated supply reel 13. The power of the battery 18 is supplied to the power supply circuit 17.
Are supplied to the respective motors 19 of the VTR section 10 and the camera section 11.

The operation of the VTR unit 10 for rewinding a video cassette tape for recording and reproducing video signals will be described. When the VTR unit 10 takes up a tape, the motor-integrated take-up reel 12 rotates in a direction in which the tape is taken up. With this rotation, the electric motor-integrated supply reel 13 functions as a generator as a power generation means and generates an AC voltage E4. This generator has basically the same power generation principle as the generator of the first embodiment.

The switch 14 switches the connection to the power side where the supply reel 13 integrated with the electric motor functions as a generator in response to the winding operation. Rectifier circuit 1
Numeral 5 is a circuit for converting the AC voltage E4 generated by the motor-integrated supply reel 13 as a generator into a DC voltage D2.

The DC voltage D2 charges the battery 18. The voltage stored in the battery 18 is supplied to the motor-integrated take-up reel 12 through the power supply circuit 17.

In the backflow prevention circuit 16, the voltage of the battery 18 is supplied only to the motor-integrated take-up reel 12, which is the operating motor, and the motor-integrated supply reel 13 functions as a generator. This is a circuit for preventing the power generated by the power supply from being directly supplied to the battery 18.

When the VTR unit 10 takes up a tape, the motor-integrated take-up reel 12 rotates in a direction in which the tape is taken up. With this rotation, the electric motor-integrated supply reel 13 functions as a generator as a power generation means and generates an AC voltage E4. This generator has basically the same power generation principle as the generator of the first embodiment.

The switching unit 14 switches the connection to the power side on which the supply reel 13 integrated with the electric motor functions as a generator according to the winding operation. Rectifier circuit 1
Numeral 5 is a circuit for converting the AC voltage E4 generated by the motor-integrated supply reel 13 as a generator into a DC voltage D2.

The battery 18 is charged with the DC voltage D2. The voltage stored in the battery 18 is supplied to the motor-integrated take-up reel 12 through the power supply circuit 17.

In the backflow prevention circuit 16, the voltage of the battery 18 is supplied only to the motor-integrated take-up reel 12, which is an operating motor, and the motor-integrated supply reel 13 functions as a generator. This is a circuit for preventing the power generated by the power supply from being directly supplied to the battery 18.

In the case of an operation for fast-forwarding the tape in the VTR section 10, the motor-integrated supply reel 13 rotates, and the motor-integrated take-up reel 12 rotates with this rotation to generate electric power. It operates as a unit to generate an AC voltage, switches the connection to the power side generated by the switch 14, and is supplied to the battery 18 in the same manner as described above.

As described above, when the tape is rewound or fast-forwarded by the VTR section 10, the other reel rotating along with the driven reel switches the AC voltage obtained by generating power by acting as a generator. By switching the AC voltage E4 to a DC voltage D2 and charging the battery 18 by switching with the heater 14, the consumption of the battery can be suppressed without requiring a large-capacity battery or power generation by an oscillating gear. .

More specifically, the motor 13 on the supply reel functions as a generator during the operation of winding the tape, and the motor 12 on the winding reel functions as the generator during the operation of rapidly feeding the tape. Thus, electric power can be generated.

The switch 14 switches between the power generated from the motor 13 on the supply reel side and the power generated from the motor 12 on the winding side in accordance with the winding or fast-forwarding operation. Can be supplied to the rectifier circuit.

Further, in each embodiment, the present invention is carried out by using a VTR integrated camera. However, the same effect can be obtained by using a mini disk (MD), a tape recorder or the like.

[0047]

As described above, according to the battery-driven recording / reproducing apparatus of the present invention, it is possible to connect a drive system for driving a medium without requiring a large-capacity battery or an oscillating gear as in the prior art. By providing the power generation means
It is possible to provide an excellent battery-driven recording / reproducing apparatus which can charge the battery when the medium is driven, suppress the consumption of the battery, and can be used for a long time.

More specifically, by providing the take-up reel and the supply reel with power generating means, the battery can be charged at the time of fast-forwarding and rewinding operation of the tape, and the consumption of the battery can be suppressed. An excellent VTR-integrated camera can be obtained.

Further, since power generation by a large capacity battery or an oscillating gear is not required, a small space can be obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram of a VTR-integrated camera according to a first embodiment of the present invention;

FIG. 2 is a block diagram of a VTR integrated camera according to a second embodiment of the present invention;

FIG. 3 is a block diagram illustrating a power generation operation of the generator according to each embodiment.

FIG. 4 is a block diagram of a conventional VTR integrated camera.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Take-up reel 2 Generator 3 Supply reel 4 Generator 5 Mixer 6 Rectifier circuit 7 Backflow prevention circuit 8 Battery 9 Power supply circuit 10 VTR section 11 Camera section 12 Take-up reel integrated with electric motor 13 Supply reel integrated with electric motor 14 switch 15 rectifier circuit 16 backflow prevention circuit 17 power supply circuit 18 battery

Claims (5)

[Claims] 1. A battery-driven recording / reproducing apparatus for recording / reproducing a signal on / from a medium by supplying electric power of a battery to a medium driving unit, comprising: a power generating means connected to a driving system for driving the medium; A battery-driven recording / reproducing apparatus configured to charge the battery with electric power generated by a power generation unit. 2. A battery-driven recording / reproducing apparatus for recording / reproducing a signal on / from a magnetic tape by supplying electric power of a battery to a tape traveling drive unit, wherein at least one of a supply reel drive system and a take-up reel drive system A battery-driven recording / reproducing apparatus, comprising: a power generating means connected to the battery; and charging the battery with the power generated by the power generating means. 3. A battery-driven recording / reproducing apparatus for recording / reproducing a signal on / from a magnetic tape by supplying electric power of a battery to a tape traveling drive unit, wherein a supply reel drive system and a take-up reel drive system are respectively provided. A battery-driven recording / reproducing apparatus, comprising: a connected power generating means; and a mixer for combining outputs of the power generating means, and configured to charge the battery with power generated by the power generating means. 4. A battery-driven recording / reproducing apparatus for recording / reproducing a signal on / from a magnetic tape by supplying electric power from a battery to a tape traveling drive unit, wherein at least one of a supply reel drive system and a take-up reel drive system A battery-driven recording system in which one of the reel drive systems is driven to generate power by driving the other reel drive system, and the power is charged to the battery to reduce the power consumption of the battery. Playback device. 5. A battery-driven recording / reproducing apparatus for recording / reproducing a signal on / from a magnetic tape by supplying electric power of a battery to a tape traveling drive unit, wherein a supply reel drive system and a take-up reel drive system are respectively provided. A power generating means, and a switching device connected to the output side of the power generating means for generating power. When one of the reel driving systems is driven, the other reel driving system is driven to generate power, and the electric power is charged to the battery. Battery-powered recording and playback device that consumes less battery power.