JPH0836775A - Information recorder/reproducer - Google Patents

Abstract

PURPOSE:To allow the electric field strength of a radiating radio wave to stably fall within a standard by simply varying the oscillation frequency of the radio wave radiated from high-frequency modules in a plurality of optical heads placed in the same apparatus. CONSTITUTION:The operating power source voltage of high-frequency module of a laser controller 132 is regulated via a control circuit 131 by setting from an operating unit 2, and the operating power source voltage of the high-frequency module of a laser controller 142 is regulated via a control circuit 141. A sufficient frequency difference is obtained by considering the movement (change) by the temperature so that the oscillation frequency of the radiating radio wave from the module of the control circuit 132 does not coincide with that of the module of the circuit 142.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information recording / reproducing apparatus such as an optical disk apparatus for mounting a plurality of semiconductor laser oscillators with a high frequency module to record information on an optical disk medium and reproducing the recorded information. .

[0002]

2. Description of the Related Art A semiconductor laser existing in an optical head mounted on an optical disk apparatus is unstable in its emission due to so-called "return light noise" generated by reflected light from the optical disk. Therefore, a semiconductor laser oscillating device with a high frequency module has been put into practical use, which is capable of stable light emission by superimposing an AC current (high frequency) of about 200 to 800 MHz on the semiconductor laser drive current during semiconductor laser oscillation.

Also, there is a problem that radio waves leak from this high-frequency module and cause radio interference, and a countermeasure against radiated radio waves that keeps the electric field strength of the radiated radio waves within the standard is proposed in Japanese Patent Application No. 5-68776. Has been done. The oscillating frequency fx exceeding the standard of the electric field strength as shown in FIG. 6 (a) is kept within the standard as shown in FIG. 6 (b) by taking measures against radiated radio waves.

However, in the case of an optical disk device having a semiconductor laser oscillator with a high frequency module mounted for each of two (or a plurality of) optical heads in the same device, the radio waves radiated from the two high frequency modules are If the oscillation frequencies are the same, (a) and (b) of FIG.
Even if the electric field strengths of the radiated radio waves of the oscillation frequencies fa and fb from the two high-frequency modules of the optical head are within the specifications as shown in FIG. 7, as shown in (c) of FIG.
The electric field strength of b) will exceed the standard.

Further, as shown in FIGS. 8 (a) and 8 (b), the values of the oscillation frequencies fa and fb are different, and the oscillation frequencies have a certain degree of difference (Δfb-a when fa> fb). Even then, problems can arise. Ie 2
When two high frequency modules are used at the same temperature, the electric field strengths of the two radio waves are within the standard as shown in FIG. 8C, but when the two high frequency modules are used at different temperatures. , For example, when high-frequency modules are placed on the optical heads above and below the optical disk in the same device, the environmental temperature is significantly different,
As shown in FIG. 8D, the oscillation frequency fa may move (change) as the oscillation frequency fa ′ due to the temperature rise, and the oscillation frequencies (fa ′ and fb) may match.

[0006]

As described above, even if measures against radiated radio waves are taken, the oscillating frequencies of the radiated radio waves radiated from the high frequency modules in the plurality of optical heads mounted in the same device are the same. If so, there is a problem that the combined electric field strength exceeds the standard even if the electric field strength of the radiated radio wave of each high-frequency module is within the standard. Further, even if the oscillation frequencies are different, there is a possibility that the oscillation frequencies may coincide with each other due to the movement of the oscillation frequencies due to the environmental temperature, and the electric field strength cannot be stably within the standard.

Therefore, according to the present invention, the oscillation frequency of the radiated radio wave radiated from each high frequency module in a plurality of optical heads mounted in the same device can be easily changed, and the electric field strength of the radiated radio wave can be stably regulated. It is an object of the present invention to provide an information recording / reproducing device that can be housed inside.

[0008]

An information recording / reproducing apparatus of the present invention is equipped with a plurality of semiconductor laser oscillators with a high frequency module in which a high frequency from a high frequency module is superposed on a driving current of a semiconductor laser to record / reproduce information. In the information recording / reproducing apparatus to be performed, the control means controls the operating power supply voltage for each high-frequency module so that the oscillation frequencies of the radiated radio waves emitted by the high-frequency module do not match.

The information recording / reproducing apparatus of the present invention is equipped with a semiconductor laser oscillating device with a high frequency module in which the high frequency from the high frequency module is superimposed on the drive current of the semiconductor laser, and the oscillating frequency of the radiated radio wave radiated from the high frequency module. In an information recording / reproducing apparatus for recording / reproducing information having a device that emits a radiated radio wave having a frequency close to, the oscillation frequency of the radiated radio wave emitted from the device that radiates the radiated radio wave and the radiation from the high frequency module It is composed of a device for radiating the radiated radio wave and a control means for controlling the operating power supply voltage of the high frequency module so that the oscillation frequency of the radiated radio wave does not match.

The information recording / reproducing apparatus of the present invention is an information recording / reproducing apparatus for recording / reproducing information by mounting a plurality of semiconductor laser oscillating devices with a high frequency module in which a high frequency from a high frequency module is superimposed on a driving current of a semiconductor laser. A plurality of supply means provided for each of the high frequency modules, for supplying an operating power supply voltage of the high frequency module,
Designating means for designating an operating power supply voltage to be supplied to each of the supply means so that the oscillating frequencies of the radiated radio waves emitted from the high frequency modules do not match, and the operating power supply for each of the supply means according to the designation of the designating means. And a control means for controlling the voltage.

In the information recording / reproducing apparatus of the present invention, the high frequency from the first high frequency module is superposed on the driving current of the semiconductor laser, and the high frequency from the second high frequency module is provided. An information recording / reproducing apparatus for recording / reproducing information by mounting a second semiconductor laser oscillating device with a high-frequency module superimposed on a drive current of a semiconductor laser, wherein an operating power supply voltage of the first high-frequency module is supplied. No. 1 supply means, second supply means for supplying the operating power supply voltage of the second high-frequency module, oscillation frequency of the radiated radio wave emitted from the first high-frequency module, and radiation from the second high-frequency module. When there is a possibility that the oscillation frequency of the radiated radio wave will be the same or that there will be a change due to changes in the ambient temperature,
Designating means for designating a change between the operating power supply voltage supplied from the first supply means and the operating power supply voltage supplied from the second supply means for changing the oscillation frequency, and the specifying means. The control means controls the operating power supply voltage supplied from the first supply means and the operating power supply voltage supplied from the second supply means in accordance with designated changes.

[0012]

The present invention is an information recording / reproducing apparatus for recording / reproducing information by mounting a plurality of semiconductor laser oscillators with a high frequency module, wherein a high frequency from a high frequency module is superimposed on a drive current of a semiconductor laser. The operating power supply voltage for each high-frequency module is controlled so that the oscillating frequencies of the radiated radio waves radiated to the two do not match.

According to the present invention, a semiconductor laser oscillating device with a high frequency module, in which a high frequency from a high frequency module is superimposed on a driving current of a semiconductor laser, is mounted, and radiation of a frequency close to an oscillation frequency of a radiated radio wave emitted from the high frequency module is mounted. In an information recording / reproducing apparatus for recording / reproducing information having a device that emits a radio wave, the oscillation frequency of the emission radio wave emitted from the device that emits the emission radio wave and the oscillation frequency of the emission radio wave that is emitted from the high frequency module The operating power supply voltage of the device for emitting the radiated radio wave and the operating power supply voltage of the high frequency module are controlled so that and do not match.

The present invention is an information recording / reproducing apparatus for recording / reproducing information by mounting a plurality of semiconductor laser oscillating devices with a high frequency module, wherein a high frequency from a high frequency module is superimposed on a drive current of a semiconductor laser. The operating power supply voltage of the high-frequency module is supplied from a plurality of supply means, and the operating power supply voltage supplied to each of the supply means is specified so that the oscillating frequencies of the radiated radio waves emitted by the high-frequency modules do not match. Then
The operating power supply voltage for each of the supply means is controlled according to the designation.

According to the present invention, the high frequency from the first high frequency module is superimposed on the drive current of the semiconductor laser, and the high frequency from the first high frequency module and the second high frequency module are applied to the drive current of the semiconductor laser. An information recording / reproducing apparatus for recording and reproducing information by mounting a second semiconductor laser oscillating device with a high-frequency module superimposed on the first high-frequency module, wherein an operating power supply voltage of the first high-frequency module is supplied by a first supply means. The operating power supply voltage of the second high frequency module is supplied by the second supply means, and the oscillation frequency of the radiated radio wave radiated from the first high frequency module and the radiated radio wave radiated from the second high frequency module If there is a possibility that the oscillation frequency will match or change due to changes in the ambient temperature, the above-mentioned Change of the operating power supply voltage supplied from the supplying means and the operating power supply voltage supplied from the second supplying means are designated, and the operating power supply voltage is supplied from the first supplying means according to the designated change. The operating power supply voltage and the operating power supply voltage supplied from the second supply means are controlled.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows an optical disk device 1 for double-sided recording / reproducing according to an information recording / reproducing device of the present invention. That is, the optical disc device 1 includes a spindle motor 92 that rotates the optical disc D, a motor control circuit 121 that controls the spindle motor 92, and information recording on the lower surface side of the optical disc D that is provided below the optical disc D.
An optical head 94 for reproducing, a linear motor 93 for moving the optical head 94 in the radial direction of the optical disc D, and a first controller 1 for controlling the optical head 94 and the linear motor 93.
30, an optical head 96 provided above the optical disc D for recording and reproducing information on the upper surface side of the optical disc,
Linear motor 95 for moving optical head 96 in the radial direction of optical disc D, optical head 96 and linear motor 95
And a second control unit 140 for controlling the input and an operation unit 2 for performing an input operation.

The optical head 94 includes a laser diode 122 as a semiconductor laser oscillator and a collimator lens 12.
3, beam splitter 124, objective lens 125, condenser lens 126, photodetector 127, and drive coil 12
8 and 129.

The optical head 96 has the same structure as the optical head 94. The first control unit 130 includes a control circuit 131, a laser control circuit 132, a linear motor control circuit 133, a focus / tracking processing circuit 134,
The signal processing circuit 135, the interface circuit 136, and the ID switch 137 are included.

The second control section 140 includes a control circuit 141,
A laser control circuit 142, a linear motor control circuit 143,
It is composed of a focus / tracking processing circuit 144, a signal processing circuit 145, an interface circuit 146, and an ID switch 147, and each circuit is the same as that of the first control unit 130.

A first controller 130 is connected to the optical head 94 and the linear motor 93, and the optical head 9 is connected to the first controller 130.
A second control unit 140 is connected to the 6 and the linear motor 95.

To the control circuits 131 and 141, an operation section (instructing means) 2 for changing the operating power supply voltage of the high frequency module of the laser control circuits 132 and 142, which will be described later, is connected. The motor control circuit 121 is connected to the control circuits 131 and 141 via an OR circuit 157.

The optical disc D is rotated by the spindle motor 92 at a constant speed, for example. The spindle motor 92 is controlled by the motor control circuit 121 and is rotated in the forward direction (normal rotation) or in the reverse direction (reverse rotation). The motor control circuit 121 is the control circuit 1
The spindle motor 92 is rotated according to the control signals supplied from the reference numerals 31 and 141.

Recording / reproducing of information on the lower surface side of the optical disk D is performed by an optical head 94 provided under the optical disk D, and recording / reproducing of information on the upper surface side of the optical disk D is performed on the optical disk D. D
Is performed by the optical head 96 provided on the upper part of the.

The laser diode 122 emits laser light. The collimator lens 123 collimates the laser light generated from the laser diode 122 into parallel light.

The beam splitter 124 guides the laser light from the collimator lens 123 to the objective lens 125 and reflects the light from the objective lens 125 (reflected light from the optical disc D) to the condenser lens 126. .

The objective lens 125 is the beam splitter 1
The laser light from 24 is irradiated onto the optical disc D. The objective lens 125 is held by a wire or a leaf spring (not shown), and the objective lens 125 is moved in the focusing direction (the optical axis direction of the lens) by the drive coil 128, and the drive coil 129.
Tracking direction (direction orthogonal to the optical axis of the lens)
It is possible to move to.

The condenser lens 126 is the beam splitter 1.
The light from 24 is condensed on the photodetector 127. The photodetector 127 is composed of four-division photodiodes, and outputs an electric signal used for focusing and tracking.

As a result, the laser light generated by the laser diode 122 is applied to the optical disc D through the collimator lens 123, the beam splitter 124 and the objective lens 125, and the reflected light from the optical disc D is reflected by the objective lens 125. , Is guided to the photodetector 127 via the beam splitter 124 and the condenser lens 126.

The optical head 94 is moved by the linear motor 93 in the radial direction of the optical disk D, and the optical head 96 is moved by the linear motor 95 in the radial direction of the optical disk D.

The control circuit 131 controls the optical head 94 and the linear motor 93, and controls recording and reproduction of the optical head 94. Laser control circuit 132
Causes the laser diode 122 to generate a laser beam corresponding to the reproduction light amount in accordance with the switching signal from the control circuit 131, and the recording pulse supplied from the control circuit 131 in the state where the laser beam of the reproduction light amount is generated. The laser diode 122 is driven according to the (original signal) to generate a laser beam of a recording light amount. The laser control circuit 132 controls the output light amount (reproduction light amount) of the laser diode 122 by a monitor current from a photodiode (not shown).

The linear motor control circuit 133 responds to the signal from the control circuit 131 and the track difference signal from the focus / tracking processing circuit 134 to the linear motor 93.
Is to move.

Focus / tracking processing circuit 134
Is for obtaining a track difference signal using the output of the photodetector 127, outputting a track drive signal in accordance with this track difference signal, and outputting a focusing signal for the focus point.

Focus / tracking processing circuit 134
The track drive signal output from is supplied to the drive coil 129 in the tracking direction. The track difference signal output from the focus / tracking processing circuit 134 is supplied to the linear motor control circuit 133.

Focus / tracking processing circuit 134
The focusing signal output from is supplied to the drive coil 128 in the focusing direction, and the laser light is controlled so that the laser light is always in perfect focus on the optical disc D.

The output of each photodiode of the photodetector 127 in the state where focusing and tracking are performed as described above is supplied to the signal processing circuit 135. The signal processing circuit 135 takes the sum current of the output of each photodiode of the photodetector 127 (which reflects the unevenness of the pits (recording information) formed on the track) and converts this sum current into a voltage value. However, the image data and address data (track number, sector number, etc.) are reproduced by this voltage value.

The signal processing circuit 135 is provided with a circuit for demodulating and error correcting the reproduced signal, and the signal subjected to the error correcting process is controlled by an optical disk as an external device via an interface circuit 136. It is transferred to a device (not shown).

Further, in the signal processing circuit 135, there is provided a modulation circuit for modulating the recording data supplied from the optical disk control device (not shown) through the interface circuit 136 into a recording pulse. It is output to the laser control circuit 132.

In the ID switch 137, the interface circuit 136 is provided with the optical head 94 on the lower surface side of the optical disc D.
Data indicating that the circuit is a control system circuit is set.

The interface circuit 136 serves as an interface for exchanging signals between the optical disk control device (not shown) and the control circuit 131 and the signal processing circuit 135. The data of the ID switch 137 allows the lower surface side of the optical disk D. The control system for the optical head 94 or the control system for the optical head 96 on the upper surface side of the optical disc D is performed.

The control circuit 141 controls the optical head 96 and the linear motor 95, and controls the recording and reproduction of the optical head 96. The laser control circuit 142 causes the laser diode 122 to generate a laser beam corresponding to the reproduction light amount in accordance with the switching signal from the control circuit 141, and supplies the laser beam from the control circuit 141 in the state where the reproduction light amount of the laser beam is generated. The laser diode 122 is driven according to the recorded recording pulse (original signal) to generate a laser beam of a recording light amount. The laser control circuit 142 controls the output light amount (reproduction light amount) of the laser diode 122 by a monitor current from a photodiode (not shown).

The linear motor control circuit 143 responds to the signal from the control circuit 141 and the track difference signal from the focus / tracking processing circuit 144 to the linear motor 95.
Is to move.

Focus / tracking processing circuit 144
Is for obtaining a track difference signal using the output of the photodetector 127, outputting a track drive signal in accordance with this track difference signal, and outputting a focusing signal for the focus point.

Focus / tracking processing circuit 144
The track drive signal output from is supplied to the drive coil 129 in the tracking direction. The track difference signal output from the focus / tracking processing circuit 144 is supplied to the linear motor control circuit 143.

Focus / tracking processing circuit 144
The focusing signal output from is supplied to the drive coil 128 in the focusing direction, and the laser light is controlled so that the laser light is always in perfect focus on the optical disc D.

The output of each photodiode of the photodetector 127 in the state where focusing and tracking are performed as described above is supplied to the signal processing circuit 145. The signal processing circuit 145 takes the sum current (which reflects the unevenness of the pits (recording information) formed on the track) of the output of each photodiode of the photodetector 127, and converts this sum current into a voltage value. However, the image data and address data (track number, sector number, etc.) are reproduced by this voltage value.

The signal processing circuit 145 is provided with a circuit for performing demodulation processing and error correction processing on the reproduced signal, and the signal subjected to the error correction processing is passed through the interface circuit 146 to an optical disc as an external device. It is transferred to a control device (not shown).

Further, in the signal processing circuit 145, there is provided a modulation circuit for modulating the recording data supplied from the optical disk control device (not shown) via the interface circuit 146 into a recording pulse. It is output to the laser control circuit 142.

In the ID switch 147, the interface circuit 146 has the optical head 96 on the upper surface side of the optical disc D.
Data indicating that the circuit is a control system circuit is set.

The interface circuit 146 serves as an interface for exchanging signals between the optical disk control device (not shown) and the control circuit 141 and the signal processing circuit 145. The data of the ID switch 147 allows the lower surface side of the optical disk D to be used. The control system for the optical head 94 or the control system for the optical head 96 on the upper surface side of the optical disc D is performed.

FIG. 2 shows the configuration of the laser control circuits 132 and 142. In FIG. 2A, the laser control circuit 132 is composed of an LD drive circuit 3a, a high frequency module 4a, and a power supply 5a. LD drive circuit 3
“A” drives the laser diode 122.
The high frequency module 4a superimposes a high frequency of 200 to 800 MHz on the drive current of the laser diode 122. The operating power supply voltage of the high frequency module 4a is set to the power supply 5a via the control circuit 131 by the operation of the operation unit 2.
A semiconductor laser oscillation device with a high frequency module is formed from the laser diode 122, the LD drive circuit 3a, and the high frequency module 4a.

In FIG. 2B, the laser control circuit 14
Reference numeral 2 includes an LD drive circuit 3b, a high frequency module 4b, and a power source 5b. The LD drive circuit 3b drives the laser diode 122. The high-frequency module 4b supplies the drive current of the laser diode 122 with 2
A high frequency of 00 to 800 MHz is superimposed. The power supply 5b is
The operating power supply voltage of the high frequency module 4b is set through the control circuit 131 by the operation of the operation unit 2. A semiconductor laser oscillating device with a high frequency module is formed from the laser diode 122, the LD drive circuit 3b, and the high frequency module 4b.

FIG. 3 shows the relationship between the operating power supply voltage set in the power supplies 5a and 5b necessary for driving the high frequency modules 4a and 4b and the oscillation frequency, which is 3.0V.
There is a width of ~ 6.0V. Also, this 3.0V to 6.0V
It is known that the oscillation frequency changes (Δfc) depending on the operating power supply voltage at this time, as shown in FIG.

FIG. 4 shows the relationship in which the oscillation frequency fa moves (changes) depending on the ambient temperature.
A difference of fa'-a occurs. In this case, for example, the radio wave emitted from the high frequency module 4a has an oscillation frequency fa and the radio wave emitted from the high frequency module 4b has an oscillation frequency fb.
Therefore, the oscillation frequency fa and the oscillation frequency fb may be determined and used by the selection of the high frequency module so that the value of Δfa′-a becomes sufficiently smaller than the value of Δfb-a. Since it is often a semiconductor component, there is no large variation within the same lot and it is almost impossible, and even if it is possible, the cost will be very high and not practical.

The movement (change) of the oscillation frequency is larger in the movement (change) due to the operating power supply voltage than in the movement (change) due to the temperature, and the present invention utilizes this characteristic. Next, an operation for easily and stably using two high frequency modules having the same or close oscillation frequencies in such a configuration will be described.

First, for example, the optical disk D is rotated at a constant speed by the spindle motor 92, and the optical head 94 and the linear motor 93 provided below the optical disk D are controlled by the first controller 130 to control the optical disk D.
Recording or reproduction is performed on the lower surface side of the optical disk 96 and the linear motor 9 and the optical head 96 provided on the optical disk D.
5 is controlled by the second control unit 140 to perform recording or reproduction on the upper surface side of the optical disc D.

In the laser control circuit 132, the LD drive circuit 3a drives the laser diode 122, and the high frequency module 4a to which the set operating power supply voltage is supplied from the power supply 5a outputs a high frequency (200) to the drive current of the laser diode 122. .About.800 MHz) are superimposed. In this way, the semiconductor laser oscillator with a high frequency module formed by the laser diode 122, the LD drive circuit 3a, and the high frequency module 4a is operated.

Further, in the laser control circuit 142,
The LD drive circuit 3b drives the laser diode 122,
The high frequency module 4b to which the set operating power supply voltage is supplied from the power supply 5b superimposes a high frequency (200 to 800 MHz) on the drive current of the laser diode 122. In this way, the laser diode 122, LD
A semiconductor laser oscillator device with a high frequency module formed of the drive circuit 3b and the high frequency module 4b is operated.

At this time, the oscillation frequency fa from the high frequency module 4a and the oscillation frequency f from the high frequency module 4b.
It is assumed that the radiated radio wave of b is generated. First, as shown in FIG. 5A, the oscillation frequency fa from the high frequency module 4a and the oscillation frequency fb from the high frequency module 4b.
If and are close (or match), fa <f
When the value is b, the setting operation is performed from the operation unit 2 so that the value of fa is further reduced and the value of fb is further increased.

That is, the operating power supply voltage of the high frequency module 4a set to the power supply 5a of the laser control circuit 132 via the control circuit 131 is increased by the setting operation from the operation unit 2, and the laser control is performed via the control circuit 141. The operating power supply voltage of the high frequency module 4b set to the power supply 5b of the circuit 142 is lowered.

As a result, as shown in FIG. 5B, the oscillating frequency fa from the high frequency module 4a becomes lower and becomes fa ″, and the oscillating frequency fb from the high frequency module 4b becomes higher. fb ″. Therefore, the value of Δfb-a becomes the value of Δfb ″ -a ″, and the shift value Δ of the oscillation frequency due to the temperature rise shown in FIG.
Since it is set to be larger than fa′-a, it is possible to stably keep the electric field strength within the standard even if it is affected by the environmental temperature.

As described above, according to the above embodiment,
The electric field strength of the radiated radio wave can be kept within the standard by simply changing the oscillation frequency of the radiated radio wave radiated by a single or a plurality of high frequency modules.

Further, even if there is a circuit (or a device) that oscillates at a frequency similar to that of the high frequency module in the device, it is possible to deal with it by the method described above.

[0063]

As described above in detail, according to the present invention,
Information recording / reproduction that can easily change the oscillating frequency of the radiated radio waves radiated from each high-frequency module in multiple optical heads mounted in the same device, and stabilize the electric field strength of the radiated radio waves within the standard A device can be provided.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic configuration of an optical disk device that is an embodiment of the present invention.

FIG. 2 is a diagram showing a schematic configuration of a laser control circuit.

FIG. 3 is a diagram showing a relationship between an operating power supply voltage of a high frequency module and an oscillation frequency.

FIG. 4 is a diagram for explaining the relationship in which the oscillation frequency moves according to the ambient temperature.

FIG. 5 is a diagram for explaining an operation of moving an oscillation frequency.

FIG. 6 is a diagram for explaining a countermeasure against radiated radio waves having an oscillation frequency.

FIG. 7 is a diagram for explaining that the electric field strength exceeds the standard due to synthesis of oscillation frequencies.

FIG. 8 is a diagram for explaining the movement of the oscillation frequency depending on the environmental temperature of the high frequency module.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Optical disk device 2 ... Operation part 3a, 3b ... LD drive circuit 4a, 4b ... High frequency module 5a, 5b ... Power supply 94, 96 ... Optical head 122 ... Laser diode 131, 141 ... Control circuit 132, 142 ... Laser control circuit 135 , 145 ... Signal processing circuit

Claims (4)

[Claims] 1. An information recording / reproducing apparatus for recording / reproducing information by mounting a plurality of semiconductor laser oscillating devices with a high frequency module, wherein a high frequency from a high frequency module is superimposed on a driving current of a semiconductor laser. An information recording / reproducing apparatus comprising control means for controlling the operating power supply voltage for each high-frequency module so that the respective oscillating frequencies of the radiated radio waves do not match. 2. A semiconductor laser oscillating device with a high frequency module, wherein a high frequency from a high frequency module is superimposed on a driving current of a semiconductor laser, and a radiated radio wave having a frequency close to an oscillation frequency of a radiated radio wave radiated from the high frequency module is mounted. In an information recording / reproducing apparatus for recording / reproducing information having a radiating device, the oscillating frequency of the radiated radio wave emitted from the device for radiating the radiated radio wave and the oscillating frequency of the radiated radio wave emitted from the high-frequency module are An information recording / reproducing apparatus comprising: a device for radiating the radiated radio waves so that they do not coincide with each other; and a control means for controlling an operating power supply voltage of the high frequency module. 3. An information recording / reproducing apparatus for recording / reproducing information by mounting a plurality of semiconductor laser oscillators with a high frequency module, wherein a high frequency from a high frequency module is superimposed on a driving current of a semiconductor laser, the information recording / reproducing apparatus being provided for each high frequency module. Specifying a plurality of supply means for supplying the operating power supply voltage of the high-frequency module and an operating power supply voltage supplied for each of the supply means so that the oscillation frequency of the radiated radio wave radiated for each of the high-frequency modules does not match. An information recording / reproducing apparatus comprising: a means, and a control means for controlling an operating power supply voltage for each of the supplying means according to the designation of the designating means. 4. A semiconductor laser oscillating device with a first high frequency module in which a high frequency from a first high frequency module is superimposed on a driving current of a semiconductor laser, and a high frequency from a second high frequency module is superimposed on a driving current of a semiconductor laser. An information recording / reproducing apparatus for recording / reproducing information by mounting the second semiconductor laser oscillating device with a high-frequency module, comprising: a first supply means for supplying an operating power supply voltage of the first high-frequency module; Second supply means for supplying the operating power supply voltage of the second high frequency module, the oscillation frequency of the radiated radio wave radiated from the first high frequency module, and the oscillation frequency of the radiated radio wave radiated from the second high frequency module If there is a possibility that they will coincide with each other or due to a change due to the ambient temperature, it is possible to change the oscillation frequency by using the first Specifying means for specifying changes in the operating power supply voltage supplied from the supplying means and the operating power supply voltage supplied from the second supplying means, and the first means in accordance with the changes specified in the specifying means. An information recording / reproducing apparatus comprising: a control unit that controls an operating power supply voltage supplied from a supply unit and an operating power supply voltage supplied from a second supply unit.