JPH08249789A - Recording/reproducing device - Google Patents

Abstract

PURPOSE: To properly judge the detection of a battery capacity corresponding to the recording time or the reproducing time and to contrive elongation of a battery lasting time and also miniaturization and weight reduction of the equipment concerned. CONSTITUTION: A voltage of the battery 33 is fetched into a system controller 11, where judgement is performed as to whether a battery capacity is enough or not. At the time of judging the battery capacity, detecting width of the battery voltage is changed for the recording time and the reproducing time. Consequently, judgement as shortage of the capacity is prevented from happening for a battery which still has remained capacity at the recording time, due to an effect of a temporary drop of the battery voltage at the time of starting intermittent recording.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording / reproducing apparatus for recording / reproducing a digital audio signal on, for example, a magneto-optical disk, and more particularly to controlling the remaining capacity of a battery.

[0002]

2. Description of the Related Art As an optical disc player for recording / reproducing a digital audio signal on a magneto-optical disc or an optical disc, for example, a disc using a disc having a diameter of 64 mm (hereinafter referred to as a mini disc (MD)) is known. ing. Some of such mini disc players have been made smaller and lighter and have a built-in battery to facilitate portability.

In such a battery-driven portable mini disk player, if the battery capacity becomes insufficient, normal recording / reproducing operation cannot be performed. Therefore, in a battery-driven portable mini-disc player, conventionally, the voltage of the battery is detected to determine whether or not the capacity is sufficient.

That is, conventionally, as shown in the flowchart of FIG. 7, for example, first, the number of data is initially set (step S101), and a predetermined time t ₀₁ (for example, 4 m).
It is determined whether or not a second has passed (step S10).
2) When the predetermined time t ₀₁ has elapsed, the detected value of the battery voltage is fetched (step S103). When the detected value of the battery voltage is fetched, the number of data is incremented (step S104). It is determined whether the number of data has reached "10" (step S105), and if the number of data has not reached "10", step S102.
Then, the detected value of the battery voltage is taken in every predetermined time t ₀₁ . In step 105, the number of data is "1.
If it is determined that the battery voltage has reached "0", the detected values of the battery voltage 10 times are averaged (step S106). It is determined whether this average value is below a predetermined level (step S107). If the average value of the detected values of the power supply voltage is equal to or higher than the predetermined level, it is determined that the battery capacity is sufficient, the process returns to step S101, and the battery voltage detection is continued. If the average value of the detected value of the power supply voltage is below the specified level,
It is determined that the battery capacity is not sufficient, and the recording / reproducing operation is stopped (step S108).

By such an operation, the battery voltage is taken in every t ₀₁ . This battery voltage sampling data is averaged. As shown in FIG. 8, when the average value of the sampling data D _{00 to} D ₀₉ is equal to or higher than the predetermined level V _th , it is determined that the battery capacity is sufficient, and the normal recording / reproducing operation is continued. As shown in FIG. 9, when the averaged value of the sampling data D _{00 to} D ₀₉ becomes equal to or lower than the predetermined level V _th , it is determined that the battery capacity is insufficient, and the normal recording / reproducing operation is stopped.

[0006]

As described above, in the conventional portable mini-disc player, it is determined whether or not the average value of the battery voltage detection values, for example, 10 times, is equal to or more than a predetermined value to determine whether or not the battery capacity is present. Is judging. However, in a mini disk recording / reproducing device that performs intermittent recording,
When the presence or absence of the battery capacity is determined in this way, it may be determined that the battery capacity is insufficient at the time of recording, but the recording operation cannot be performed even though the battery capacity is still remaining.

That is, in the mini disk recording / reproducing apparatus, when recording audio data, as shown in FIG. 10A, the data is stored in the buffer memory and intermittently recorded on the disk. At the start of recording, it is necessary to move the pickup and perform focus control to increase the laser beam power. Therefore, when the battery capacity starts to run short, as shown in FIG. 10B, at the start of intermittent recording, the power supply voltage temporarily drops greatly from V ₁ to V ₂ ,
After that, the battery voltage recovers to V ₃ . At the end of the intermittent recording, the battery voltage becomes V ₁ .

As shown in FIG. 10C, when the battery capacity starts to run short, the average value of the battery voltage detection values D _{00 to} D ₀₉ falls below a predetermined level V _th due to a temporary voltage drop at the start of intermittent recording. turn into. However, if the battery capacity remains to this extent, after recovering from the temporary drop in battery voltage at the start of recording,
Since the power supply voltage of the battery becomes the predetermined voltage V _th or more,
You can record. However, conventionally, in such a case, it is determined that the battery capacity is insufficient.

If the battery capacity can be detected without being affected by the temporary drop of the battery voltage at the start of the intermittent recording, the battery duration at the time of recording becomes long. In other words, the capacity of the battery for realizing the same battery duration as the conventional one can be reduced, and the size and weight can be reduced.

Therefore, an object of the present invention is to provide a recording / reproducing apparatus which can appropriately detect the detection of the battery capacity according to recording or reproducing, and can prolong the battery duration and reduce the size and weight of the device. Especially.

[0011]

According to the present invention, there is provided a reproducing load to be driven during a reproducing operation, a recording load to be driven during a recording operation, and a battery for supplying power to the recording load and the reproducing load. The determination means includes a voltage detection means for detecting the voltage of the battery and a determination means for determining whether or not the battery capacity is sufficient from the output of the voltage detection means.
This is a recording / reproducing apparatus in which the detection width is changed according to the reproducing operation and the recording operation.

[0012]

[Function] The detection range of the battery voltage can be changed between recording and reproducing. Therefore, due to the temporary drop in the battery voltage at the start of intermittent recording, it is possible to prevent the battery capacity from being determined to be insufficient at the time of recording, even though the battery capacity still remains.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. The present invention is applied to, for example, a mini disc player that records / reproduces a digital audio signal on a disc (mini disc) having a diameter of 64 mm housed in a cartridge.

FIG. 1 shows an embodiment of a mini disc player to which the present invention is applied. In FIG. 1, reference numeral 1 is a disc. The disc 1 includes a reproduction-only disc and a recording / reproduction disc. Figure 2A
Shows a read-only disc 1A, and FIG.
The disc 1B for reproduction is shown. 2A and 2B
As shown in, the lead-in areas 51A and 51B are provided on the innermost circumferences of the disks 1A and 1B. The lead-in areas 51A and 51B are used for both the reproduction-only disc 1A and the recording / reproduction disc 1B.
It is a ROM area, that is, data is recorded in the form of physical pits. A P-TOC (pre-mastered TOC) is provided in the lead-in areas 51A and 51B.

In the case of the read-only disc 51A, as shown in FIG. 2A, a program area 52A and a lead-out area 53A are provided from the lead-in area 51A toward the outer periphery. In the case of the reproduction-only disc 51A, it is entirely a ROM area.

In the case of the recording / reproducing disc 1B,
UT from the lead-in area 51B toward the outer circumference
An OC (user TOC) area 54, a program area 52B, and a lead-out area 53B are provided. U-
The TOC area 54 and the program area 52B are recordable areas, that is, recordable / reproducible by magneto-optical. The P-TOC and U-TOC are used to record disc management information.

FIG. 3 shows one sector (sector 0) of the P-TOC information. To the P-TOC sector 0, a synchronization pattern formed by 1-byte data of all 0s or alls 1 and an address indicating a cluster address and a sector address are added to the head position, and this is used as a header. Further, an identification ID is added by an ASCII code corresponding to the character "MINI" at a predetermined address position following the header, indicating that the area is a P-TOC area. Furthermore, the disc type, recording level, and song number of the first recorded song (First
TNO), song number of the last song (Last TNO), read start address LO _A , power cal area start address PC _A , U-TOC start address U
ST _A , the start address RST _A of the recordable area (recordable user area), etc. are recorded. Then, a corresponding table instruction data section having table pointers (P-TNO1 to P-TNO255) for making each music recorded in the pit form correspond to a parts table in a management table section described later is prepared.

In the area following the correspondence table instruction data portion, 255 (01h) to (FFh) corresponding to the table pointers (P-TNO1 to P-TNO255) in the correspondence table instruction data portion are stored. A parts table is prepared. The numerical value with "h" is so-called hexadecimal notation. In each part table, a start address as a starting point, an end address as an ending point, and mode information (track mode) of the part can be recorded.

(01h) to (F) in the management table section
Each of the parts tables up to Fh) has table pointers (P-TNO1 to P-TNO) in the corresponding table instruction data section.
255) indicates the content of the part. That is, the table pointer P-T is set for the first song.
A parts table as NO01 (for example, (01
h)) is recorded, and in this case, the parts table (0
The start address of 1h) is the start address of the recording position of the first music piece, and similarly the end address is the end address of the position where the first music piece is recorded. Further, the track mode information becomes information about the first music piece. Similarly, for the second music piece, the start address, end address, and track information of the recording position of the second music piece are recorded in the parts table (for example, (02h)) indicated by the table pointer P-TNO02.

In the case of a recordable / reproducible mini disk, since there is no so-called pre-mastered music area, the correspondence table instruction data section and the management table section are not used (these are the U-TOC described later). Managed), and thus each byte is all "00h".

Next, the U-TOC will be described. FIG.
Like the P-TOC, the U-TOC sector 0 shown in FIG. 1 is provided with a header first, and then at a predetermined address position, a manufacturer code, a model code, a song number of the first song (First TNO), and a song number of the last song. Song number (Last
TNO), sector usage (Used secto
rs), disc serial number, disc ID and other data are recorded. Further, since the user makes a recording and identifies a recorded music area, a free area, and the like by associating them with the management table section, various table pointers (P-DF) are used as the correspondence table instruction data section.
A, P-EMPTY, P-FRA, PTON01-PT
An area for recording NO255) is prepared.

Then, a table pointer (P-DFA-
As a management table unit corresponding to P-TNO 255), 255 parts tables of (01h) to (ffh) are provided, and each part table has a start address as a starting point for a certain part, The end address to be the end and the mode information (track mode) of the part are recorded. Furthermore, this U
-In the case of TOC sector 0, the part indicated in each part table may be connected following another part, so a link indicating the part table in which the start address and end address of the connected part are recorded. Information can be recorded.

Even if the data of one music piece is recorded physically discontinuously, that is, over a plurality of parts, there is no problem in the reproducing operation by reproducing while accessing between the parts. , It may be recorded in multiple parts. Therefore, link information is provided, and for example, the numbers (01h) to (FF) given to each parts table are provided.
The part tables can be connected by designating the part tables to be connected according to (h).

In FIG. 1, the disk 1 is rotationally driven by a spindle motor 2. For disk 1,
An optical head 3 is provided. The optical head 3 includes an optical system including a laser diode for irradiating a laser beam, a polarization beam splitter, an objective lens 3A, and the disc 1.
A detector or the like for detecting the reflected light from is provided. The objective lens 3A uses the biaxial device 4
It is movable in the radial direction of the disk and in the direction of moving toward and away from the disk. The laser beam from the laser diode of the optical head 3 has a high level at the time of recording because it heats the recording track to the Curie temperature, and at the time of reproduction, the data is detected from the pit data or the reflected light due to the magnetic Kerr effect. Will be at a very low level.

6A is a magnetic head. Magnetic head 6A
Are arranged to face the optical head 3. Magnetic head 6
A applies a magnetic field modulated by data to the disk 1 during recording. The entire optical head 3 and the magnetic head 6A can be integrally moved in the radial direction of the disk by the sled mechanism 5.

Reference numeral 7 is an RF amplifier, and the RF amplifier 7 is
From the output of the detector of the optical head 3, a reproduction RF signal, a tracking error signal, a focus error signal, etc. are extracted by arithmetic processing. The output of the RF amplifier 7 is supplied to the digital servo circuit 9.

A tracking error signal and a focus error signal are given to the digital servo circuit 9. Further, the digital servo circuit 9 is provided with a track jump command, an access command, rotation speed detection information of the spindle motor 2 and the like from the system controller 11.
In response to this, various servo drive signals are generated from the digital servo circuit 9 in the form of, for example, a PWM signal. The output of the digital servo circuit 9 is supplied to the servo driver 8. By the output of the servo driver 8, the 2-axis mechanism 4
Also, the sled mechanism 5 is driven to perform focus and tracking control.

Further, the servo driver 8 applies power corresponding to the PWM signal as the spindle error signal to the motor driver 13. The motor driver 13 is a so-called three-phase switching drive motor. During normal recording / reproduction, the rotation speed information of the spindle motor 2 is obtained from the reproduction data. That is, in the digital servo circuit 9, the reproduction clock is extracted from the edge detection of the reproduction RF signal (EFM signal), and compared with the reference clock, the spindle error signal is generated. Based on such a spindle error signal, the spindle motor 2 is controlled to a constant speed (CLV).

Reference numeral 10 is a signal processor. Signal processing unit 10
Is composed of an encoder / decoder unit 10A, a memory control unit 10B, and an encoder / decoder unit 10C. The signal processing unit 10 uses an encoder /
The decoder unit 10C compresses the digital audio signal and temporarily stores it in the buffer RAM 12. Then, the encoder / decoder unit 10A performs error correction coding processing and EM
F-modulate and output. At the time of reproduction, the encoder / decoder unit 10A performs error correction processing and EMF demodulation, and temporarily stores this data in the buffer RAM 12. And
The encoder / decoder unit 10C decompresses and outputs.

Reference numeral 14 is a conversion unit, which is a D / A converter 14
An A / A / D converter 14B is provided. The digital audio data output by the audio compression decoding processing of the encoder / decoder unit 10C is converted into an analog signal by the D / A converter 14A, output from the line output terminal 15, and output as, for example, an LR audio signal. Alternatively, it is supplied to the headphone output terminal 18 via the electronic volume 16 and the headphone amplifier 17.

During reproduction, address information, subcode data, etc. are extracted by the encoder / decoder unit 10A and supplied to the system controller 11. These pieces of information are used for various control operations.

When the headphone to be connected is provided with a remote commander, the signal from the remote commander is located at the same position as the headphone output terminal 18, for example, a remote control input / output terminal 19 in the form of a 4-terminal connector.
Is supplied to the system controller 11. When the remote commander has a display unit, the system controller 11 sends a display control signal to the remote control input / output terminal 1
It will be output from 9.

Reference numeral 25 denotes a display unit, and the display unit 25 is composed of, for example, a liquid crystal display. Display unit 2
5, based on the control of the system controller 11,
The operating status, track number, time information, character information, etc. are displayed.

Reference numeral 26 denotes an operation unit provided with keys used for user operation, including a reproduction key, a recording key, a stop key, and an A key.
An MS key, a search key, etc. are provided so as to be operated by the user.

Reference numeral 27 is a stepper driver, and 28 is a stepper motor, which is a driving portion for raising and lowering the magnetic head 6A. This operation is controlled by the system controller 11.

Reference numeral 29 denotes an EEPROM, which holds various servo coefficients in the digital servo system, for example. The system controller 11 is an EEPROM 29
Then, the required coefficient is extracted from and is supplied to the digital servo circuit 9. The system controller 11
The RAM 11A shown inside is a work area in the system controller 11.

Reference numeral 30 denotes a clock unit, which constantly counts the year, month, day, hour, minute, and second by a small battery different from the operating power source and the like, so that the system controller 11 can always discriminate the current date and time.

Reference numeral 31 is a power supply circuit for supplying an operating power supply to each part. In addition to using a battery 33 housed as a power supply, a commercial power supply can be used by connecting an AC adapter to the DC-IN terminal 32.

The power supply voltage from the power supply circuit 31 is supplied to the system controller 11 via the microcomputer power supply circuit 35. Further, the DC / DC co-inverter 34 outputs the operating power supply voltage to each unit. Further, the power supply voltage from the power supply circuit 31 is A of the system controller 11.
It is supplied to the / D port and the battery voltage is taken in.

At the time of recording, an audio signal is supplied from the optical / line input terminal 20 or the microphone input terminal 21. An analog audio signal from the optical / line input terminal 20 or an audio signal input from the microphone input terminal 21 and amplified by the microphone amplifier 22 is sent to the A / D converter 14B via the AGC circuit 23 and the electronic volume 24. Supplied. A /
The D converter 14B converts the analog audio signal into digital audio data in the form of 16-bit quantization and 44.1 kHz sampling. Then, it is supplied to the encoder / decoder unit 10C and subjected to audio compression encoding processing. The digital audio signal from the optical / line input terminal 20 is directly supplied to the encoder / decoder section 10C.

The recording data compressed by the encoder / decoder section 10C is once written into the buffer RAM 12 by the memory control 10B and is read out at a predetermined timing, and the encoder / decoder section 10C is read.
After being subjected to encoding processing such as CIRC encoding and EFM modulation at A, it is supplied to the magnetic head drive circuit 6 via the digital servo circuit 9.

The magnetic head drive circuit 6 supplies a magnetic head drive signal to the magnetic head 6A in accordance with the encoded recording data. That is, an N or S magnetic field is applied to the disk 1 by the magnetic head 6. Also,
At this time, the system controller 11 outputs a recording level laser beam to the optical head.
Control the laser power. Further, during recording, the digital servo circuit 9 performs position servo with respect to the magnetic head 6A to keep the relative distance between the magnetic head 6A and the disk 1 substantially constant. Further, during recording, the spindle servo compares the clock obtained from the groove on the disk 1 with the reference clock to generate a servo error signal, and performs CLV control.

At the time of reproduction, the optical head 3 intermittently reads information from the disk 1. This reproduction information is supplied to the RF amplifier 7. The reproduced RF signal from the RF amplifier 7 is supplied to the encoder / decoder unit 10A and subjected to processing such as EFM demodulation, CIRC processing, and CD-ROM decoding. Then, the memory control unit 1
It is once written in the buffer RAM 12 by 0B.
The data written in the buffer RAM 12 is supplied to the encoder / decoder unit 10C. Then, reproduction signal processing such as decoding processing for audio compression processing is performed,
Digital audio data in the form of 16-bit quantization and 44.1 KHz sampling. This voice data is
The analog signal is returned to the analog signal by the D / A converter 14A, output from the line output terminal 15, and output as, for example, an LR audio signal. Alternatively, it is supplied to the headphone output terminal 18 via the electronic volume 16 and the headphone amplifier 17.

When the recording / reproducing operation is performed on the disc 1, the management information recorded on the disc 1, that is,
It is necessary to read the above-mentioned P-TOC and U-TOC. That is, when the disc is mounted, the optical pickup 4
Is moved to the innermost lead-in areas 51A and 51B, and the management information is read from the P-TOC. Further, when the mounted disc is the recording / reproducing disc 1B, the management information is read from the U-TOC area 54. The system controller 11 determines the address of the area to be recorded on the disc 1 and the address of the area to be reproduced according to the management information.

When recording is performed on the recording / reproducing disc 1B, the U-TOC information is edited according to the recording or erasing of data each time recording / erasing is performed, and the optical pickup 4 is operated by the U pickup.
The information is moved to the -TOC area 54 and the U-TOC information is rewritten. When the eject operation of the disc 1 is performed or the power off operation is performed, the UT
The operation is stopped after the OC is rewritten.

Further, when the battery is driven, the battery 3
If the capacity of 3 is insufficient, recording / playback cannot be continued. Therefore, the power supply voltage is supplied to the A / D port 11B of the system controller 11, and the battery voltage is detected. From the detected value of the battery voltage, it is determined whether or not the battery capacity is insufficient. When it is determined that the battery capacity is insufficient, the reproducing operation is stopped at the time of reproducing, and at the time of recording, the operation is stopped after rewriting the U-TOC.

FIG. 5 is a flow chart showing the operation at this time. As shown in the flow chart of FIG. 5, in the recording / reproducing apparatus to which the present invention is applied, the method of determining the battery capacity is changed during recording and during reproduction. That is, at the time of recording, the capacity of the battery is determined from the sample value of the battery voltage in the range of the short time width, and at the time of reproduction, the capacity of the battery is determined from the sample value of the battery voltage of the relatively long time width.

In FIG. 5, first, it is judged whether it is a recording operation or a reproducing operation (step S1). In the case of the recording operation, it is judged whether or not a predetermined time t ₁ (for example, 4 msec) has elapsed (step S2), and the predetermined time t ₁
When has passed, the detected value of the battery voltage is fetched (step S3). Again, whether the predetermined time t ₁ has elapsed is determined (step S4), and the detected value of the battery voltage When the predetermined time t ₁ has elapsed is taken (step S5). When the detected values of the two battery voltages are fetched in this way, it is determined whether the detected values of the two battery voltages are both equal to or lower than the predetermined voltage V _th (step S6). If the detected values of the two battery voltages are not equal to or lower than the predetermined voltage V _th , it is determined that there is battery capacity, and the process returns to step S2. If the detected values of the two battery voltages are both equal to or lower than the predetermined voltage _Vth , the U-TOC is accessed (step S7) and the U-TOC information is stored in the RAM.
Is read from (step S8). This information is written in the U-TOC area of the disc (step S9),
The recording operation is stopped (step S10).

If it is determined in step S1 that the operation is a reproduction operation, first, the number of data is initialized (step S11). Whether the predetermined time t ₁ has elapsed is determined (step S12), the detected value of the battery voltage When the predetermined time t ₁ has elapsed is taken (step S13).
When the detected value of the battery voltage is fetched, the number of data is incremented (step S14). It is determined whether the number of data has reached "10" (step S1).
5), unless the number of data is reached "10", the process returns to step S12, at every predetermined time t _1, the detected value of the battery voltage is gradually incorporated. If it is determined in step 15 that the number of data has reached “10”, the detected values of the battery voltage 10 times are averaged (step S16). It is determined whether this average value is below a predetermined level (step S17). If the average voltage detection value is equal to or higher than the predetermined level, it is determined that there is battery capacity, and step S11 is performed.
Then, the battery voltage detection is continued. If the average value of the detected values of the power supply voltage is equal to or lower than the predetermined level, it is determined that the battery capacity is not sufficient, and the reproducing operation is stopped (step S18).

As described above, in the embodiment of the present invention, the presence or absence of the battery capacity is judged from the detected value of the battery voltage twice when recording, and from the average value of the detected value of the battery voltage ten times when reproducing. The presence or absence of battery capacity is determined.

That is, in the disc recording / reproducing apparatus described above, intermittent recording is performed as shown in FIG. 6A. Therefore, as shown in FIG. 6B, the battery voltage temporarily drops at the start of intermittent recording. In this embodiment, when recording, 2
The presence or absence of battery capacity is judged from the detected value of the battery voltage at each time. Therefore, it is not affected by the temporary drop in battery voltage at the start of intermittent recording. That is, as shown in FIG. 6B, when the battery capacity starts to run low,
A temporary voltage drop occurs at the start of intermittent recording. However, if the battery capacity remains to some extent, the detected values D ₁ and D ₂ of the _two battery voltages when the voltage drop occurs temporarily will not be lower than the predetermined level V _th . Therefore, even if the battery capacity starts to run short and the battery voltage temporarily drops at the start of intermittent recording, it is no longer determined that the battery capacity is low.

[0052]

According to the present invention, the detection width of the battery voltage can be changed during recording and during reproduction. For this reason,
Due to the temporary drop in the battery voltage at the start of intermittent recording, it is possible to prevent the battery capacity from being judged to be insufficient at the time of recording, even though the battery capacity still remains. As a result, the battery duration can be extended and the device can be made smaller and lighter.

[Brief description of drawings]

FIG. 1 is a block diagram of an example of an optical disc recording / reproducing apparatus to which the present invention is applied.

FIG. 2 is a cross-sectional view used to describe an example of an optical disc.

FIG. 3 is a schematic diagram used to describe an example of an optical disc.

FIG. 4 is a schematic diagram used to describe an example of an optical disc.

FIG. 5 is a flow chart used for explaining one embodiment of the present invention.

FIG. 6 is a waveform chart used for explaining one embodiment of the present invention.

FIG. 7 is a flowchart used to describe a conventional battery detection circuit.

FIG. 8 is a waveform diagram used to describe an example of a conventional battery detection circuit.

FIG. 9 is a waveform diagram used to describe an example of a conventional battery detection circuit.

FIG. 10 is a waveform diagram used to describe an example of a conventional battery detection circuit.

[Explanation of symbols]

 1 Disc 3 Optical pickup 11 System controller

Claims (3)

[Claims] 1. A reproducing load to be driven during a reproducing operation, a recording load to be driven during a recording operation, a battery for supplying power to the recording load and the reproducing load, and a voltage of the battery is detected. Voltage detecting means and judging means for judging whether or not the capacity of the battery is sufficient based on the output of the voltage detecting means, and the judging means detects the voltage according to the reproducing operation and the recording operation. Recording / playback device with variable width. 2. The recording / reproducing apparatus according to claim 1, wherein the management information is recorded on a recording medium when it is determined that the battery capacity is not sufficient. 3. The recording / reproducing apparatus according to claim 1, wherein recording on the recording medium is performed intermittently during the recording operation.