KR960005652B1 - Magnetic head driver for mini-disc player - Google Patents

Abstract

The biased magnetic field coil head driver enables optional recording of desired information as well as replaying information once recorded. The magnetic coil head driver consists of: an adjusting member (13) having a groove (13A) for applying moving force to an adjusting shaft (22); a stopper member (14) for keeping the biased magnetic field coil head (3) aside from contacting to the surface of a playing cartridge (2) having an escaping groove (2A); an elastic member (11) bended and fixed in between the head arm and the head holder in order to give elastic force to the magnetic field coil head (3) moving near the coating surface(1A) of the disk(1); and a screw (19) and a torsion spring (20) for providing adding force to the adjusting shaft to adjust the distance between the magnetic field coil head and the disc. The driver includes an optical pickup unit (4) reciprocating within program domain of the disc, and a biased magnetic field coil moving together with the optical pickup unit (4).

Description

Bias Magnetic Coil Head Drive in Mini Disc Player

1 is an overall structural diagram of a bias magnetic field coil head driving apparatus of a mini-disc player to which the present invention is applied, (a) is a plan view of a state in which a disc with a built-in cartridge is applied, and (b) is a side view of the magnetic field coil head for regeneration. , (c) is a side view of the magnetic coil head for the case of recording, (d) is a side view showing an open state of the top cover for insertion and discharge of the cartridge.

2 is a structural diagram of a plane and a right side surface of the bias magnetic field coil head driving apparatus of the present invention.

3 is a structural diagram of a recording button for driving a bias magnetic coil head of the present invention, (a) is a plan view, (b) is a state diagram when the recording button is " open ", and (c) is a recording button " on " "The state at the time.

Figure 4 is a control signal block diagram of the bias magnetic field coil head drive device of the present invention.

5 is a control signal block diagram of a bias magnetic field coil head drive device of the present invention.

* Explanation of symbols for main parts of the drawings

1: disc 2: cartridge

3: magnetic coil head 4: optical pickup device

5: bracket 6: objective lens

7: head arm 9: torsion spring

10 head holder 11: elastic member

12: bobbin 14: stopper member

16,20: torsion spring 19: adjustment screw

The present invention relates to a bias magnetic field coil head driving apparatus of a mini disc player capable of not only reproducing recorded information but also selectively recording information desired by a user.

Mini disc player (MINI DISK PLYER) consists of an optical pickup unit that reciprocates the program area of the disc and a bias magnetic coil designed to move simultaneously with the optical pickup unit. When the head is close to the disk coating surface, current flows, and the laser beam output rises and recording is performed at the same time.

In addition, it is provided with a configuration to prevent damage to the magnetic coil head due to a misoperation when inserting a disc for playback.

This mini disc player is a product that has a bias magnetic field coil head commercialized only by Sony, Japan. This mini disc player is connected to a cam lever mechanism using a drive motor to connect the bias magnetic coil head to a disc. It is characterized by driving to the coating surface.

However, in this system, since the drive motor and the cam lever mechanism must be installed in the player, the external dimensions of the player are set largely because the space area for installing them is very large. Setting.

In addition, the conventional mini disc player has a number of parts firstly; The assembly process takes a long time in the assembly process, and secondly; Problems have arisen that it is not easy to check the failures occurring during the operation of the device and to repair them to restore them.

The present invention provides an operation apparatus for driving a magnetic field coil to write a disk program area in accordance with a laser beam to drive the magnetic field head coil to a position close to the disk coating surface without depending on the loading motor and the cam lever mechanism; It is an object of the present invention to provide a coil head driving device that is configured to maintain a constant distance from a disk coating surface at all times, even from vibrations and vibrations caused by rotation of a disk.

It is another object of the present invention to provide a bias magnetic field coil head drive device with a stopper member for preventing the damage caused by the magnetic coil head being in contact with the cartridge surface when the operation button is misoperated when the disc for playback is inserted. There is no inconvenience in ensuring the optimal function by preventing the error according to the maximum.

Next, the most suitable embodiment of this invention is described in detail according to attached drawing.

1 is an overall structural diagram of a bias magnetic field coil head driving apparatus of a mini-disc player of the present invention, where (a) is a plan view showing the state of a cartridge in which a disc is built, and (b) of FIG. (C) drives the magnetic coil head 3 to a position near the coating surface 1A of the recordable disk for recording. (D) is a state diagram when the top cover is opened in order to insert and eject the cartridge in the top-loading player.

Two types of cartridges (2) are used in a mini disc player, one of which is a cartridge (2) having a recordable disk (1), and the other having a disc (1) for reproducing recorded information only. One cartridge 2 is.

According to Fig. 1 (a), the cartridge 2 incorporating the recordable disk 1 and the cartridge into which the playback-only disk is inserted have a shape of the same rectangular shape in plan view, and according to their functions. It is not easy to distinguish.

However, according to FIG. 1 (b), a semicircular escape for the escape of the stopper member on one side of the bottom surface is provided in the cartridge 1 having the reproduction-only disc 1 therein without a rectangular groove formed in the plane. The groove 2B is dug out to form a characteristic configuration, and according to FIG. 1C, the cartridge 2 having a recordable disk therein has the magnetic coil head 3 having the disk 1 coated surface 1A. (2) A rectangular groove (2A) is formed in the upper surface of the cartridge (2) so that it can move to a close position. have. (These shapes were set by Japan Sony Corporation as cartridge standard.)

Fig. 1 (b) shows the positions of the coil head and head arm in the state where the read-only disc is inserted, and Fig. 1 (c) shows the coil head and head arm in the state where the recording-only disc is inserted. In this case, it is confirmed that the cartridge is mounted incorrectly by the configuration of the characteristics of the cartridge and the stopper member and the operation member.

FIG. 2 (d) shows a state in which the head arm 7 including the magnetic coil head 3 is lifted. In this case, the cartridge 2 can be inserted into and removed from the disc driver body regardless of whether it is for playback or recording only. It is shown that enough space is formed, which is generally the open form of the caster nets.

2 is a detailed structural diagram of a bias magnetic field coil head drive device, in which (a) is a plan view and (b) is a right side view.

The magnetic coil head drive device is located at the bottom or bottom position of the cartridge mounting space and is installed on the optical pickup device 4 for reciprocating the program range recorded on the disk surface with the objective lens 6, and on the upper part of the optical pickup device. Thus, the optical pickup device 4 is composed of a magnetic field coil head 3 configured to move simultaneously with the reciprocating motion from side to side within the program area of the disc 1, which is a known configuration.

This can be recorded only when the center of the laser beam irradiated from the objective lens 6 and the center of the magnetic coil head 3 are located in a straight line as shown in FIG. Because.

The bracket (5) has a shape bent at a right angle, the start end is connected to the optical pickup device, the end is connected to the end of the head arm (7) so that the top cover including the head arm rotates at the end of the bracket When the head arm 7 overlaps the ends of the brackets 5, the arm shaft 8 is assembled to penetrate when the pin holes drilled therein coincide with each other.

The head arm 7 is connected to the end of the bracket 5, the length of which is formed in a relatively short length, and the through and through holes for inserting the hinge or the shaft at the beginning and the end, respectively, and the spring around A locking piece for fixing is formed.

By the assembly with the bracket 5, the starting end of the head arm 7 makes a rotation with its length in the radial range with the arm shaft 8 already fitted.

When the head arm 7 and the bracket 5 are combined, a space according to the difference in size is formed between them.

It is preferable to fit the torsion spring 9 in said space.

The torsion spring 9 constitutes a structure in which both ends are fixed to the engaging pieces formed on the head arm 7 and the bracket 5, and inserted into the through holes of the matching head arm 7 and the bracket 5. The arm shaft 8 is assembled to be fixed to the bracket 5 through the central hole of the torsion spring 9.

Thus, the head arm 7 is always retained by the torsion spring 9 to rotate to the open side.

The head holder 10 is fixed to the bottom of the start end of the head arm 7 by a adjusting screw to provide a length extending in a horizontal direction with respect to the installation state of the optical pickup device, which is the head arm 7. It becomes narrower than the width of the slit hole (10A) and the intermediate position to form a 10B.

The elastic member 11 is very flexible and excellent in elasticity from the surface of the head arm 7 to the beginning of the head holder, and is preferably formed of a polyimide film.

The resilient member 11 is called a suspension (SUSPENSION) and is fixed by a fastening element 19 that forms a fastening to the arm head 7 in a state arranged in a predetermined state, and the start end of the suspension 11C is the head holder 10. ) It is fitted into the slit holes 10A and 10B formed at both the middle and the starting end.

The suspension 11C is fixed to the upper surface of the head holder while the start end is inserted into the hole 10A at the intermediate position, and the starting end is inserted into and fixed to the hole 10B formed at the start end of the head holder 10.

The suspension 11C positioned between the holes 10A and 10B of the head holder 10 is bent like a bow, and retains elasticity by its excellent elasticity at a portion bent like a bow.

The bobbin 12 in which the magnetic coil head 3 for recording information is embedded is suspended from the concave surface of the head holder 10 that is bent like a bow.

The magnetic coil head 3 should always be at a constant distance from the coating surface 1A of the disk 1 in order to maintain a constant magnetic flux.

In order to maintain a constant distance (X: preferably 0.1 mm) at all times, the surface facing the coated surface 1A of the disk 1, which is located at the bottom of the bobbin 12 having the magnetic coil head 3 embedded therein. A projecting step 12A of about 0.1 mm is formed between the central portion and the circumferential surface of the core. (At the time of recording, the projecting step 12A of the bobbin 12 is formed at a small pressure on the coating surface 1A of the disc 1). Contact)

In addition, when moving the head arm 7 in the direction of the cartridge 2 in order to maintain a proper distance to the vibration caused by the rotation of the disk 1 or the impact by external force, the projecting step 12A of the bobbin 12 is a disk ( The head arm 7 is moved more than the position where it is in contact with the coating surface 1A of 1), and a part of the suspension 11C suspended from the bobbin 12 is deformed as shown in FIG. The unstable state is corrected by causing the portion 11A to occur.

The adjusting screw 19 is installed in a configuration penetrating the suspension 11C, the head arm 7 and the head holder 10, so that if the limit of correction of the magnetic coil head 3 is deviated, the adjustment of the magnetic coil head 3 is performed. The position of the adjustment screw 22 is inserted into the adjustment shaft 22 through a pin hole formed in a rectangular shape at the beginning of the head arm 7 so that the tip of the adjustment screw 19 contacts the surface of the adjustment shaft 22. do. The position of the adjustment shaft 22 located in the rectangular pin hole is adjusted by the adjustment screw 19 which tightens and loosens in a head arm.

The adjustment shaft 22 has a sufficient length so that the magnetic coil head 3 does not reciprocate in the program area of the disk 1 and has a length of the torsion spring 20 fitted in both side directions of the head arm 7. When both ends are fixed to the fixing piece formed in the head arm, the force is fixed in the direction of the adjusting screw 19 so that the adjusting shaft 22 can be moved within the rectangular range of the pin hole.

The adjusting shaft 22 penetrating the head arm is coupled to the operation member 13 installed at the right end of the mini disc player body.

The stopper member 14 is provided between the head arm 7 and the bracket 5 in order to protect the surface of the magnetic coil head 3 and the regeneration cartridge 2 upon insertion of the regeneration cartridge.

The stopper member 14 is generally formed in a "b" shape, one side of which is formed a head surface 14B for stopping the lowering of the magnetic coil head 3 when the regeneration cartridge is inserted, and the regeneration cartridge 2 on the other side. A sensing surface 14A is formed to distinguish between the recording cartridge 2 and a stopper 14C having a pin hole in the center between the head surface 14B and the sensing surface 14A, and having a spring engaging protrusion on one side thereof. ), A support piece 5A which protrudes vertically from the bracket 5 to form a pin hole in the center of the side thereof in order to hang the stopper 14C at a predetermined position, and the stopper 14C described above. The hinge pin 15 penetrating the through hole of the support piece 5A and the hinge pin 15 are inserted into the engaging projection of the stopper 14C, and the other end thereof is hooked to the support piece 5A. Of the torsion spring 16 facing the stopper shaft 17 with the elasticity always held Consists of configuration.

The stopper shaft 17 drills holes on both sides of the head arm 7 located directly above the head surface 14B of the stopper 14C. The stopper shaft 17 penetrates the stopper shaft 17 through the above-mentioned hole to stop the stopper 14C. Head face 14B makes contact with the surface of the shaft.

3 shows the structure of the operation member 13, where (a) is a plan view and (b) shows the position of the operation member 13 and the head arm 7 when regenerating only, (c) Is a state diagram showing the positions of the operation member 13 and the head arm 7 at the time of recording.

The adjustment shaft 22 penetrating the rectangular pin hole formed on both sides of the start end of the head arm 11 and the torsion spring 20 has a right end coupled with the operation member 13 installed in the mini disc player body. do.

The operation member 13 has a groove 13A into which the inner surface is dug horizontally and is then inclined toward the end so that the adjustment shaft 22 is inserted, and the contact protrusion 13B for making contact with the finger on the opposite outer surface thereof. To form a protrusion. In addition, the hook 13C which can control the opening and closing state of the top cover when the locking and unlocking is achieved at the start end of the operation member 13 in a shape that forms a shape with the jaw 21 protruding from the player's body. ) Is composed of an operation button 13E which protrudes in the sliding direction of the operation member.

The groove 13A formed on the inner surface of the operation button 13E is moved in the moving direction of the operation button 13E, and the adjustment shaft 22 is shaped as the groove 13A when the groove 13A moves. By this, the adjustment shaft 22 is moved in the direction of the optical pickup device. At the same time, the position of the head arm 7 is also changed at the same time.

This change of position of the head arm 7 eventually interrupts the state in which the magnetic coil head 3 contacts or separates from the disk surface.

The hook 13C formed at the start end of the operation button 13E needs to prevent the top cover of the mini disc player from opening when the operation button 13E is moved to the " on " side. It is coupled to the jaw 21 to achieve locking of the top cover.

A power switch 18 is provided between the groove 13A and the hook 13C of the operation button 13E to operate and control the driving circuit, and the terminal knob 18A of the power switch 18 is operated by the operation button ( By inserting into the engaging groove 13C formed on the inner side of 13E, the terminal knob 18A of the power switch 18 moves simultaneously to the "on" or "off" side of the power switch simultaneously with the movement of the operation button 13E. Let's do it.

Referring to the effect of the present invention in detail as follows.

In the state where the front switch 18 is "off", since the hook 13C of the operation button 13E is in the unlocking state of the jaw 21 connected to the body of the mini disc player, the top cover can be opened.

When the top cover is opened, the head arm 7 including the head arm 10 is turned by a lifting device (not shown). The lifting state of the head arm 7 includes the bracket 5 and the head arm 7. The head arm 7 rotates from the arm shaft 8 to which it is connected, and it is heard in an inclined state with respect to the optical pickup device 4 as shown in FIG.

In the above lifted state, the recordable cartridge 2 or the cartridge for reproduction only 2 can be inserted or removed.

In the above lifted state, when the cartridge 2 containing the reproducing disk 1 is inserted and the head arm 7 is lowered horizontally, the position of the magnetic coil head 3 is shown in FIG. But the stopper 14C is not in contact with the cartridge according to the sensing surface 14A located in the groove 2B cut in one side of the cartridge 2, and FIG. Likewise, the head surface 14B of the stopper 14C is in contact with the stopper shaft 17 of the head arm 7 as shown in FIG. 2B to prevent the head arm 7 from descending. do.

The lower stop state of the stopper shaft 17 is continuously maintained until the sensing surface 14A of the stopper 14C, which is resilient to the torsion spring 16, is pressed by the cartridge 2.

This is because when the regeneration-only cartridge 2 is inserted and the recording operation button 13E is moved, the head 14B of the stopper 14C contacts the stopper shaft 17 fixed to the head arm 7 so that the magnetic coil head This prevents the (3) from moving in the direction of the cartridge (2). The reclaimed cartridge (2) does not have a square groove (2A), so if the device is not present, the magnetic coil head (3) contacts the surface of the cartridge (2). This is because there is a risk of damage.

The stopper shaft 17 fixed to the head arm 7 is lengthened so that the magnetic coil head 3 can serve as a stop wherever the magnetic coil head 3 is located in the program region of the disk 1.

Thus, in the present invention, when the reproduction-only cartridge 2 is inserted into such a device, the operation button 13E does not move in any operation.

Therefore, the magnetic coil head 3 is not in contact with the cartridge surface.

When the recordable cartridge 2 is inserted into the mini-disc driver main body to record a desired song, push the operation button 13E in the " off " position in FIG. When moved to the same position as c), the power switch 18 is "on" and the right end of the adjustment shaft 14 fitted to the head arm 7 has the shape of the cut face of the groove 13A of the operation button 13. And the head arm 7 is tilted from the horizontal state to the inclined state so that the magnetic coil head 3 is driven to a position near the coating surface 1A of the disk 1 as shown in FIG. Recording starts according to a control signal such as 4 degrees.

The control signal is "on" to drive the power supply stabilization circuit so that the power supply voltage pressure can be applied to the drive circuit during writing.

In the power stabilization circuit, the voltage input to the driving circuit should be stabilized by reducing the RIPPLE value of the input power supply voltage to the extreme. Since the source of the current flowing through the driving circuit to the magnetic coil head 3 is accurately stabilized, Play a role.

When the EFM data is input, the EFM data is applied to the drive circuit by means of the switch, and the direction of the current input to the magnetic field coil head 3 is changed in accordance with the EFM data.

Accordingly, the signal of each part is shown in FIG.

When you want to finish recording here, move the operation button 13E to the position of FIG. 3 (b), and the groove 13A of the operation button 13E will push the adjustment shaft 22 to its recessed surface. The head arm 7 ends recording while separating the magnetic coil head 3 in contact with the surface of the disk from the surface of the disk as shown in FIG. 1 (b).

In addition, when the top cover is opened by operating a separate lifting device for discharging the cartridge 2, the head arm is opened in an inclined state as shown in FIG.

By the way, if the top cover is opened with the operation button 13E "on" while the cartridge 2 containing the recordable disc 1 is stored in the player, the position of the magnetic coil head 3 becomes the cartridge. Since the inside of the square groove 2A of (2) moves the cartridge 2, the magnetic coil head 3 may be caught by the square groove 2A of the cartridge 2 and be damaged.

Therefore, the hook 13C is caught by the jaw 21 connected to the body of the player at the lower side of the operation button 13E, so that the top cover is not opened when the power switch 18 is "on".

Therefore, the present invention is because the bias magnetic field coil head drive does not use a drive motor or a cam lever mechanism; The size of the player is greatly reduced; Simple operation can stably record desired songs even under vibration or abnormal conditions of the player; Even when the disc is shaken or externally impacted by the player's shock, it can maintain a certain distance at all times, and the adjustment screw can be installed to adjust the position of the magnetic coil head so that it can fully function during the assembling process or deformation of the parts, making the recording safe. And fourth; The magnetic field coil head is also protected from misoperation of the record button.

Claims (6)

In the bias magnetic coil drive device of a mini disc player, a bias magnetic field coil head (3) penetrates through the head arm (7) so that the bias magnetic field coil head (3) moves circularly from the recording position of the coating surface (1A) of the disc (1) to the reproducing position. An adjusting member 13 having a groove 13A for applying a moving force to the adjusting shaft 22; A stopper member 14 for preventing the bias magnetic field coil head 3 from contacting the surface of the regeneration cartridge 2 having the escape groove 2A; A disc (1) resilient member (22) for fixing the magnetic coil head (3) moving to a position close to the coating surface (1A) between the head arm and the head holder so as to have elasticity with respect to the disc; The through hole of the head arm is provided with a screw 19 and a torsion spring 20 which provide an additional force to the adjustment shaft in order to adjust the magnetic coil head position in the forward and backward directions so that the proper distance between the magnetic coil head 3 and the disc is aligned. And bias magnetic field coil drive device of the mini-disc player, characterized in that provided in the periphery thereof. The magnetic field coil head (3) in contact with the disk (1) coating surface (1A) is characterized in that the bobbin (12) containing the magnetic field coil head (3) is maintained at a constant distance from the surface of the disk. Mini disc player, characterized in that the center surface is formed lower than the circumferential surface so that the magnetic field coil head 3 does not directly contact the disk coating surface 1A even when the contact force between the bobbin and the disk increases. Bias magnetic field coil drive. The method of claim 1, wherein the elastic member 11 is made of a narrow and thin band-shaped suspension (11A) of excellent elasticity, one side of which is fixed to a part of the head arm (7), the other side of the head holder It is fixed to the end of the head arm 10 in a state of bowing through the middle of (10), and when the bobbin 12A contacts the disk 1 coating surface 1A, part of the suspension 11A is deformed to have a magnetic field. A bias magnetic field coil head drive device for a mini player, characterized in that the gap between the bobbin (12) of the coil head (3) and the disc (1) is eliminated. The groove (13A) according to claim 1, wherein the operation member (13) has a groove (13A) integrally having an inclined surface forming a lowering of the adjusting shaft (22) penetrating the head arm (7) and a horizontal surface for continuing the lowering state of the head arm. ) And a coupling groove (13D) for controlling the power switch on the inner side and protruding the hook (13C) to continue the engagement with the jaws of the body to block the opening of the top cover during recording in the direction of movement of the operation member A bias magnetic field coil head drive of a mini-disc player, characterized in that it comprises a button (13E). The disk coating by the suspension (11C) according to claim 1, wherein the adjustment shaft (22) contacts the torsion spring (20) fixed to the head arm (7) and the adjustment screw (19) through the head arm. A bias magnetic field coil head drive device for a mini-disc player, characterized in that the position of the magnetic field coil head (3) which forms an appropriate distance between the surface (1A) is adjusted. The stopper shaft (17) according to claim 1, wherein the head arm (7) at a position opposite to the head (13B) of the stopper member (13) prevents the magnetic coil head from contacting the cartridge (2) surface for regeneration. Bias magnetic field coil head drive device of a mini disc player, characterized in that it is installed.