JPH06162649A - Head raising and lowering device - Google Patents

Abstract

PURPOSE:To simplify the constitution of a head raising and lowering device and to prevent a magnetic head from being damaged by changing over the coupling state of a raising and lowering changeover arm to a detection lever by the type discrimination operation of a disk cartridge and changing over the state of a playback operation or a recording operation to the magnetic head by utilizing the insertion stroke of the cartridge. CONSTITUTION:A changeover arm 18 as a raising and lowering changeover means is supported by pins 14C, 14d installed at a holder 14 in such a way that it can be slid and moved, and it can be moved between a first position in which a magnetic head 7 can perform only a reproducing operation and a second position in which it can perform only a recording operation. A raising and lowering device is constituted in this manner. When a disk cartridge for reproducing use and for recording use is not inserted, the arm 18 is arranged in the second position by a coil spring 33 so as to correspond to the disk cartridge used for a recording operation. The arm 18 is arranged in the first position so as to correspond to the cartridge used for a reproducing operation, and, in both cases, the head 7 is raised or lowered while a raising and lowering support part 8a installed in an auxiliary member 8 is being supported by a raising and lowering pin 20b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
It is described as a disk. ) In an optical disk device for recording / reproducing information in / from the head, the head elevating device for switching the elevating / lowering operation of the magnetic head between a state in which recording on the disc is possible and a state in which only reproduction is possible. .

[0002]

2. Description of the Related Art Conventionally, there is a magneto-optical disk as a medium for recording / reproducing information by using a magnetic field optical effect, in which a bias magnetic field is generated by a magnetic head and laser is irradiated by an optical pickup to write information on a magnetic thin film. Is going.

As an example of the above disk drive device, a disk drive device disclosed in Japanese Patent Laid-Open No. 3-216835 will be briefly described. Note that the drawing numbers and reference numerals are cited from the publication.

In FIGS. 1 and 2 of the publication, a cartridge holder 21 is for holding a cartridge 102 that rotatably stores a disk 101, and is vertically moved with respect to the chassis 1. The carriage 9 is mounted with a pickup 8 for recording / reproducing signals of the disc 101, and is moved in the radial direction of the disc 101. Lifter 5
One end of 2 is the plunger 5 provided on the holder 21.
5, a head support 61 is formed at the other end, and the lifter 52 is rotated in the directions of arrows P and S by switching the power supply to the plunger 55. A flying magnetic head 19 for generating an external magnetic field is provided at one end of the magnetic head arm 18, and the other end is fixed to the carriage 9. Further, the magnetic head arm 18 is configured such that the tip thereof can be brought into contact with and separated from the head support portion 61 of the lifter 52, and the rotating operation of the lifter 52 causes the flying magnetic head 19 to move up and down.

Next, the operation will be described with reference to FIGS. In the initial state in which the cartridge 102 is not inserted into the holder 21, the plunger 55 is in a non-energized state, the lifter 52 is urged to rotate in the direction of arrow P, and the magnetic head arm 18 moves to the head support portion 61 of the lifter 52. Is urged to a position retracted from the cartridge 103. From this state, when the cartridge 102 is positioned at a predetermined position in the holder 21 and becomes the state shown in FIG. 2, the holder 21 descends in the direction of arrow J, the disc 101 is centered on the turntable 2, and the state shown in FIG. Recording and reproduction shown in are enabled.

When a reproducing operation of the disc 101 is performed from this state, the lifter 52 is rotated in the direction of arrow P,
When the magnetic head arm 18 is rotationally biased to a position retracted from the cartridge 103, the flying magnetic head 19 is positioned so as not to contact the disk 101 and is in a reproducible state. When a recording operation is performed on the disk 101, the plunger 55 is energized, the lifter 52 is rotated in the direction of arrow S, and the magnetic head arm 18 is rotated in the direction of arrow T. ,
The flying magnetic head 19 enters the cartridge 103, comes into contact with the surface of the disk 101, and becomes in a recordable state. When the flying magnetic head 19 is brought into the reproducible or recordable state described above, the carriage 9 is transferred integrally with the magnetic head arm 18, and the disk 101 is moved.
Is recorded / reproduced.

[0007]

However, in the head lifting device disclosed in Japanese Patent Laid-Open No. 3-216835, when a disk cartridge having a different shape for reproduction and a disk for recording is inserted, the type of the cartridge is identified. Therefore, a detecting element is required, and since the plunger is used to switch the elevation of the magnetic head arm, the structure becomes expensive. Furthermore, since the magnetic head arm is held in the posture by the head support portion of the lifter when the disk is reproduced, there is a problem that a sliding friction load between the head support portion and the magnetic head arm is large when the carriage is transferred. .

[0008]

In view of the above-mentioned drawbacks of the conventional disc clamp device, the head lifting device according to claim 1 of the present invention is a reproducing disc cartridge provided with a disc discriminating portion. The signal recording / reproducing means for reproducing the signal of the disc and for recording / reproducing the signal of the recording disc housed in the recording disc cartridge provided with the disc identifying portion and the signal recording / reproducing means are mounted inside and outside the disc. A base that is movable over the circumference, a magnetic field applying unit that applies a magnetic field when recording to a disc, a detachable position where a disc cartridge is stored and held, and a disc cartridge is inserted and ejected and recording and reproduction of the disc are performed. The cartridge holding means that moves between the playback position and the disk cartridge is moved by a predetermined amount from the cartridge holding means. The movable member movable between the ejected position where the disc cartridge is ejected and the insertion completed position where the disc cartridge is completely inserted into the cartridge holding means, and the first engaging portion is formed at one end. Between a first position where the magnetic field applying means is placed in a state where recording on the reproducing disc is impossible and a second position where the magnetic field applying means is placed in a state where recording on the recording disc is possible. And a moving means which moves integrally with the moving means, a detecting means for identifying the disc identification portion of the disc cartridge is formed at one end, and the other end of the raising / lowering switching means is formed at the other end. When a second engaging portion that can be engaged with the first engaging portion is formed and the detecting means identifies the disc identifying portion of the reproducing disc cartridge inserted into the cartridge holding means,
The disc identification of the recording disc cartridge inserted into the cartridge holding means by the second engaging portion engaging the first engaging portion of the up / down switching means to position the up / down switching means at the first position. When the parts are identified, the second engagement part and the first engagement part of the up / down switching means release the engagement state and the up / down switching means is positioned at the second position. It is a thing.

According to a second aspect of the present invention, the head lifting device reproduces the signal of the reproducing disc housed in the reproducing disc cartridge provided with the disc discriminating part and is provided with the disc discriminating part. A signal recording / reproducing means for recording / reproducing a signal of a recording disc housed in a recording disc cartridge and a signal recording / reproducing means are mounted,
A base that is movable over the inner and outer circumferences of the disc, a magnetic field applying unit that applies a magnetic field when recording on the disc, a rolling contact member rotatably provided to the magnetic field applying unit, and a disc identifying unit of the disc cartridge. When the detecting means for identifying and the detecting means identify the reproducing disk cartridge, the magnetic field applying means is brought into contact with a rolling member provided in the magnetic field applying means to hold the attitude in a state in which recording on the reproducing disk is impossible. It consists of up-and-down switching means to perform, and when the base moves,
The magnetic field applying means moves relative to the rolling contact member when the rolling contact member rolls on the up / down switching means.

[0010]

With the above construction, the head lifting device according to claim 1 of the present invention has the second engaging portion of the engaging switching means and the first engaging portion of the lifting switching means when the reproducing disk cartridge is inserted. And are brought into an engaged state, the elevation switching means is positioned at the first position, and the magnetic field applying means is put into a state in which recording is impossible. Also, when the recording disk is inserted, the engagement state between the second engaging portion of the engagement switching means and the first engaging portion of the elevation switching means is released, and the elevation switching means is moved to the second position. The position of the magnetic field applying means can be switched while the position of the magnetic field applying means is made recordable.

Further, in the head lifting device according to claim 2 of the present invention, when the reproducing disk is identified, the rolling contact member provided in the magnetic field applying means is supported by the lifting switching means while being in rotational contact with the magnetic field applying means. The posture of the magnetic field applying means is maintained in a state where recording is impossible, and the base can be transferred with a light load.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A head lifting device of the present invention will be described below with reference to the drawings.

FIG. 1 is a plan view of the head lifting device according to the present invention with no disk cartridge inserted, FIG. 2 is a left side view of the same, and FIG. 3 is a right side view of the same. FIG. 4 is a plan view showing a state in which a reproducing disk cartridge is inserted in the head lifting device.
6 is a left side view in the same state, FIG. 6 is a right side view in the same state, FIG. 7 is a left side view in a reproducible state in the head lifting device, and FIG. 8 is a right side view in the same state. . FIG. 9 is a plan view of the same head lifting device with a recording disk cartridge inserted, and FIG. 10 is a left side view of the same,
11 is a right side view of the same state, FIG. 12 is a left side view of the head elevating device in a recordable state, and FIG. 13 is a right side view of the same state. FIG. 14 shows a reproducing disk cartridge used in the head lifting device, and FIG. 15 shows a recording disk cartridge used in the head lifting device.

A disk cartridge used in the head lifting device will be described with reference to FIGS. 14 and 15.

The reproducing disk cartridge 10 shown in FIG.
1, a reproducing disk 104 is rotatably housed in the case 102, and an opening 102a for reproducing a signal is formed on the back surface of the case 102. Shutter 103
Is for opening and closing the opening 102a.
2 is slidably engaged. A disc identification portion 102b having a depth of H1 is formed on the back surface of the case 102 to identify the disc attribute, and a detection pin 17a of a head lifting device (not shown) can be inserted therein.

The recording disk cartridge 11 shown in FIG.
1, a recording disk 114 is rotatably housed in the case 112, and an opening 112a is formed over the front and back surfaces for recording / reproducing a signal and generating a bias magnetic field. The shutter 113 is for opening and closing the opening 112a, and is slidably engaged with the case 112. A disc identification portion 112b having a depth of H2 is formed on the back surface of the case 112 to identify the disc attribute so that the detection pin 17a of the head lifting device (not shown) cannot enter. Here, the depth H1 of the disc identification portion 102b of the reproduction disc cartridge 101 and the disc identification portion 112b of the recording disc cartridge 111.
The relationship with the depth H2 is H1> H2.

Next, the head lifting device will be described with reference to FIGS. 1 to 3, 14 and 15. Carriage (base)
Reference numeral 4 is equipped with a pickup (signal recording / reproducing means) 5 for recording / reproducing signals of the disks 104, 114. A guide rod 2 for guiding the carriage 4 is fixed to the chassis 1, and a lead screw 3 having a spiral groove is rotatably supported, and the carriage 4 is rotated by driving the lead screw 3 to rotate. Transferred over the inner and outer circumferences of 104 and 114. An auxiliary base 6 in which a rotary pin 6a is planted is fixed to one end of the carriage 4. A head auxiliary member 8 is rotatably supported by the auxiliary base 6, and a magnetic head (magnetic field applying means) 7 for generating a bias magnetic field at the time of recording is fixed to the head auxiliary member 8. The head auxiliary member 8 is elastically biased in the direction of arrow A by a torsion spring 9, and the head auxiliary member 8 is brought into contact with a stopper 6b formed on the auxiliary base 6 to hold the magnetic head 7 at a predetermined height during recording. ing. Further, an elevation support portion 8 a is formed on the head auxiliary member 8, and a roller 10 (rolling contact member) is rotatably supported at the tip of the head auxiliary member 8 by a fastening member 11.

The chassis 1 has a support plate 12 having pins 12a implanted therein, and a gear portion 13b having pins 13a implanted therein.
The fixed gear 13 formed with is fixed. Holder 1
4 (cartridge holding means) is a disk cartridge 1
Pins 12 for storing and holding 01, 111
It is rotatably supported by the shafts a and 13a. The chassis 1 has a guide plate 2 including a guide portion 21a and a release piece 21b.
1 is fixed.

The discharge lever 15 is slidably supported on the holder 14 by pins 15a and 15b. A projecting piece 15a is formed at one end of the ejection lever 15 and penetrates the opening 14b of the holder 14 so as to come into contact with the disk cartridges 101 and 111, and a stopper pin 15e is formed at the other end.
Has been planted. The lock lever 16 is the discharge lever 15
And is rotatably supported by the holder 14. A lock portion 16a that can be engaged with the pin 15b of the discharge lever 15 is formed at one end of the lock lever 16, and a protrusion 16b that abuts the release piece 21b of the guide plate 21 is formed at the other end. ing. Discharge lever 1
A coil spring 31 is locked between the lock lever 5 and the lock lever 16, and the ejection lever 15 is elastically biased in the direction of arrow B and the lock lever in the direction of arrow C.

A detection lever 17 is provided on the upper surface of the discharge lever 15.
When the (engagement switching means) is rotatably supported about the pin 15b as a support shaft and the disk cartridges 101 and 111 are not inserted, the coil spring 32 causes the arrow D to move.
Is elastically biased in the direction of. One end of the detection lever 17 penetrates through the opening 14b formed in the holder 14 and is bent back from the front surface to the back surface of the disk cartridge 101, 111. In addition, the detection lever 1
At the tip of 7, a detection pin 17a (detection means) is implanted,
Disc identification unit 1 of the reproduction disc cartridge 101
02b so that it can enter the recording disk cartridge 11
It is arranged so that it cannot enter the first disc identification portion 112b. Further, the other end of the detection lever 17 is substantially L
A V-shaped engaging groove 17b (second engaging portion) is formed.

The switching arm 18 (up / down switching means) is slidably supported by the pins 14c and 14d of the holder 14,
It is movable between a first position for making the magnetic head 7 ready for reproduction and a second position for making the magnetic head 7 ready for recording. When the disk cartridges 101 and 111 are not inserted, the switching arm 18 is elastically biased in the direction of arrow E by the coil spring 33 and is arranged at the second position shown in FIG. The switching arm 18 has a guide portion 18a at the center.
Is a sheet metal member formed by bridging with the engaging pin 18b (first engaging portion) planted at one end of the switching arm 18.
Is engaged with the engagement groove 17b of the detection lever 17. Guide portion 18c formed at the other end of the switching arm 18
Is slidably engaged with the guide groove 19a of the side plate 19 fixed to the holder 14 to guide the movement of the switching arm 18.

The gear lever 20 has a gear portion 20 at one end.
The pin 19b of the side plate 19 fixed to the holder 14 is a member in which a is formed and an elevating pin 20b is planted at the other end.
It is rotatably supported by. The gear portion 20a of the gear lever 20 is meshed with the gear portion 13b of the fixed gear 13, and the rotation of the holder 14 causes the gear lever 20 to rotate at an angle larger than the rotation angle of the holder 14. By the above-described rotation operation of the gear lever 20, the lift pin 20b of the gear lever 20 supports the lift support portion 8a of the head auxiliary member 8 and the magnetic head 7 is retracted.

Next, the operation of the head lifting device when the reproducing disk cartridge 101 is mounted will be described with reference to FIGS. 4 to 8 and 14.

From the state shown in FIGS. 1 to 3, a reproducing disk cartridge (hereinafter referred to as a cartridge) 101.
When is inserted into the holder 14 in the direction of arrow F, the detection lever 17 does not rotate and the detection pin 17a of the detection lever 17 enters the disc identification portion 102b. At this time, the engagement pin 18b of the switching arm 18 and the engagement groove 17 of the detection lever 17
b is engaged, and the switching arm 18 becomes movable in the direction of arrow F. When the cartridge 101 is subsequently inserted, the switching arm 18 is moved integrally with the ejection lever 15 to the first position shown in FIG. Cartridge 1
When 01 is inserted to the deepest part in the holder 14, the guide pin 15d of the ejection lever 15 engages with the lock part 16a of the lock lever 16, and the cartridge 101 is inserted into the holder 14
Is positioned at a predetermined position.

When the holder 14 is rotated and lowered in the direction of the arrow G from this state, the gear lever 20 is rotated in the same direction as the arrow G with respect to the holder 14 due to the differential with the gear portion 13b of the fixed gear 13. The magnetic head 7 is lowered while the lifting support portion 8a of the head auxiliary member 8 is supported by the lifting pins 20b. When the holder 14 is rotated halfway, the roller 10 comes into contact with the guide portion 18a of the switching arm 18, and rotation of the magnetic head 7 with respect to the holder 14 is blocked. When the holder 14 is rotated to the state shown in FIGS. 7 and 8, the magnetic head 7 is completely retracted from the cartridge 101 and is placed in a state in which only reproduction is possible, and the lift pins 20b of the gear lever 20 and the head auxiliary member. The elevating and lowering support part 8a is separated. At this time, the protrusion 16b of the lock lever 16 contacts the release piece 21b of the guide plate 21, the lock lever 16 is rotated in the direction opposite to the arrow C, and the lock portion 16a of the lock lever 16 and the guide pin of the discharge lever 15 are rotated. The engagement with 15d is released.

When the lead screw 3 rotates and the carriage 4 is transported over the inner and outer circumferences of the disk 104 from the state where only this reproduction is possible, the roller 10 and the switching arm 1 are moved.
Since the magnetic head 7 is held in the posture while being in rotational contact with the guide portion 18a of the magnetic head 7, the magnetic head 7 and the carriage 4
And are transferred together with a light load. When the holder 14 is rotated and raised in the direction opposite to the arrow G from this state, the head auxiliary member 8 is rotated and raised in the direction opposite to the arrow G with respect to the holder 4 by the elevating pin 20b of the gear lever 20. 7 is rotated from the cartridge 101 to a completely retracted position. During this time, the stopper pin 15e of the discharge lever 15 is guided by the guide portion 21a of the guide plate 21 and is kept immovable with respect to the holder 4.
When the holder 14 is rotated up and up halfway, the discharge lever 15
Stopper pin 15e of the guide plate 21a of the guide plate 21
She is forced to leave. As a result, the ejection lever 15 can move in the direction of the arrow B, and the cartridge 101 is ejected from the holder 14.

Next, the operation of the head elevating device when the recording disk cartridge 111 is mounted will be described with reference to FIGS. 9 to 13 and 15.

From the state shown in FIGS. 1 to 3, a recording disk cartridge (hereinafter referred to as a cartridge) 111.
When is inserted into the holder 14 in the direction of the arrow F, the detection lever 17 is rotated in the direction opposite to the arrow D by contact between the detection pin 17a and the disc identification portion 112b of the cartridge 111. At this time, the engagement between the engagement pin 18b of the switching arm 18 and the engagement groove 17b of the detection lever 17 is released, and the switching arm 18 cannot move in the direction of the arrow F, and the state shown in FIG. It is located in position 2. When the cartridge 111 is subsequently inserted, the switching arm 18 is not moved and only the ejection lever 17 is moved. When the cartridge 111 is inserted all the way into the holder 14,
The guide pin 15d of the discharge lever 15 is the lock lever 16
The cartridge 111 is positioned at a predetermined position of the holder 14 by engaging with the lock portion 16a of the holder.

When the holder 14 is rotated and lowered in the direction of arrow G from this state, the gear lever 20 is rotated in the same direction as the arrow G with respect to the holder 14 due to the differential with the gear portion 13b of the fixed gear 13. The magnetic head 7 is lowered while the lifting support portion 8a of the head auxiliary member 8 is supported by the lifting pins 20b. When the holder 14 is rotated to the state shown in FIGS. 12 and 13, the magnetic head 7 is brought into contact with the surface of the disk 114 for recording, and the lifting pin 20b of the gear lever 20 and the head auxiliary member 8 are placed. The elevating and lowering support part 8a is separated. At this time, the protrusion 16b of the lock lever 16 contacts the release piece 21b of the guide plate 21, the lock lever 16 is rotated in the direction opposite to the arrow C, and the lock portion 16a of the lock lever 16 and the discharge lever 1 are rotated.
The engagement with the guide pin 15d of No. 5 is released.

When the lead screw 3 is rotated and the carriage 4 is transported over the inner and outer circumferences of the disk 114 from this recording enabled state, the roller 10 and the guide portion 18a of the switching arm 18 are separated from each other. , Magnetic head 7
The carriage 4 and the carriage 4 are integrally transferred with a light load. When the holder 14 is rotated and raised in the direction opposite to the arrow G from this state, the head auxiliary member 8 causes the lift pin 20 of the gear lever 20 to move.
By b, the magnetic head 7 is rotated upward in the direction opposite to the arrow G with respect to the holder 4, and the magnetic head 7 is rotated to a position where it is completely retracted from the cartridge 111. During this time, the discharge lever 1
The stopper pin 15e of 5 is the guide portion 21 of the guide plate 21.
It is guided by the contact of a and is kept immovable with respect to the holder 4. When the holder 14 turns up halfway,
The stopper pin 15e of the discharge lever 15 is separated from the guide portion 21a of the guide plate 21. As a result, the ejection lever 15 can be moved in the direction of the arrow B, the cartridge 101 is ejected from the holder 14, and the ejection lever 15 is ejected.
The state becomes as shown in.

[0031]

As described above, according to the head lifting device of the present invention, the engagement state between the lifting switching arm and the detection lever is switched by the disc cartridge type identifying operation, and the magnetic disk is inserted using the insertion stroke of the disc cartridge. Since the state in which the head is only reproduced and the state in which recording is possible are switched, damage to the magnetic head can be prevented and reliable operation can be obtained with a simple configuration.

Further, since the head lifting device of the present invention supports the magnetic head while the roller provided on the magnetic head and the guide portion of the lifting switching arm are in rolling contact with each other during the reproducing operation, the magnetic head is transferred when the magnetic head is transferred. It is possible to provide a head elevating device that reduces a frictional load generated between the supporting member and the supporting member and can perform stable recording / reproducing operation.

[Brief description of drawings]

FIG. 1 is a plan view of a head lifting device according to the present invention with a disk cartridge not inserted.

FIG. 2 is a left side view of the same head lifting device in the same state.

FIG. 3 is a right side view of the same head lifting device in the same state.

FIG. 4 is a plan view showing a state where a reproducing disk cartridge is inserted in the head lifting device.

FIG. 5 is a left side view of the head lifting device in the same state.

FIG. 6 is a right side view of the same head lifting device in the same state.

FIG. 7 is a left side view of the head lifting device in a reproducible state.

FIG. 8 is a right side view of the same head lifting device in the same state.

FIG. 9 is a plan view showing a state where a recording disk cartridge is inserted in the head lifting device.

FIG. 10 is a left side view of the same head lifting device in the same state.

FIG. 11 is a right side view of the same head lifting device in the same state.

FIG. 12 is a left side view of the head lifting device in a recordable state.

FIG. 13 is a right side view of the head lifting device in the same state.

FIG. 14 is a reproduction disk cartridge used in the head lifting device.

FIG. 15 is a recording disk cartridge used in the head lifting device.

[Explanation of symbols]

 1 Chassis 2 Guide Rod 3 Lead Screw 4 Carriage 5 Pickup 7 Magnetic Head 8 Head Auxiliary Member 10 Roller (Rolling Contact Member) 13 Fixed Gear 14 Holder (Cartridge Holding Means) 15 Discharge Lever (Movement Means) 17 Detection Lever (Engage Switching) 18) Switching arm (up / down switching means) 20 Gear lever 101 Playback disc cartridge 111 Recording disc cartridge

Claims (2)

[Claims] 1. A signal for a reproducing disc housed in a reproducing disc cartridge provided with a disc discriminating unit, and a signal for a recording disc contained in a recording disc cartridge provided with a disc discriminating unit. Signal recording / reproducing means for performing recording / reproducing, a base that is equipped with the signal recording / reproducing means and is movable in the diameter direction of the disc, and a magnetic field imparting means for imparting a magnetic field when recording on the recording disc, A cartridge holding means for accommodating and holding the disc cartridge, and moving between a detaching position for inserting and ejecting the disc cartridge and a recording / reproducing position for recording / reproducing the disc; The ejection position where only a fixed amount is ejected and the disc inside the cartridge holding means. A moving member that is movable between the insertion completion position where the insertion operation of the cartridge is completed and a first engaging portion is formed at one end portion, and the magnetic field applying means prevents the recording from being performed on the reproducing disc. Elevating switching means movable between a first position for arranging the magnetic disk in a possible state and a second position for arranging the magnetic field applying means for recording on the recording disk, and the moving means. And a detection means for identifying the disc identification portion of the disc cartridge formed at one end, and an engagement portion with the first engagement portion of the elevation switching means at the other end. Forming a second engaging portion that can be fitted,
When the detection means identifies the disc identification portion of the reproduction disc cartridge inserted into the cartridge holding means, the second engagement portion engages with the first engagement portion of the elevation switching means. The lifting switching means is the first
Position, and when the detection means identifies the disc identification portion of the recording disc cartridge inserted into the cartridge holding means, the second engagement portion and the first engagement of the elevation switching means. A head raising / lowering device comprising an engagement switching means for releasing the engagement state with the section to position the elevation switching means at the second position. 2. A signal of a reproducing disc housed in a reproducing disc cartridge provided with a disc discriminating unit, and a signal of a recording disc contained in a recording disc cartridge provided with a disc discriminating unit. Signal recording / reproducing means for recording / reproducing, a base on which the signal recording / reproducing means is mounted and movable in the diametrical direction of the disc, a magnetic field imparting means for imparting a magnetic field when recording on the disc, and the magnetic field When the applying means is rotatably provided to the applying means, the detecting means for identifying the disk identifying portion of the disk cartridge, and the detecting means identifies the reproducing disk cartridge, the transferring means provided in the magnetic field applying means. An up-and-down switching means for contacting a contact member to hold the magnetic field applying means in a state in which recording on the reproducing disk is impossible. The head lifting device is characterized in that, when the base is moved, the magnetic field applying means moves relatively to the magnetic field applying means when the rolling contact member rolls on the lifting switching means. .