JPH0212656A - Recording or reproducing device - Google Patents

Abstract

PURPOSE:To facilitate the mounting of a phase detection member (PG coil), positioning of a mount position and its fine adjustment by inserting a small diameter part of an engagement part into a fitting hole from a hole of a support part or a notch, rotating the assembly and fixing the detection member to the support part. CONSTITUTION:A detection member to detect the rotating phase of a magnetic disk 2 as a recording medium, that is, a PG coil 35 is fitted to a prescribed support part close to the magnetic disk 2, then an engagement part 351a having a small diameter part 351b formed to the said detection member is inserted to an insertion hole 30l having a hole or a notch 30n through which the small diameter part 351b of the detection member formed to the support part is inserted. Thus, the mounting and the fine adjustment of the mount position are simplified without using a screw or the like or exclusive support means.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a rotational phase detection device suitable for use in a recording or reproducing device.

(Prior Art) Conventionally, there has been a recording or reproducing apparatus called a still video system that records or reproduces video signals, audio signals, data signals, etc. on recording tracks on a recording medium such as a magnetic disk. Are known.

In this still video system, it is necessary to control the rotational state of the electric disk with high precision and stability, and for this purpose, a rotational phase indicating member (PG bin) is provided on a part of the magnetic disk to detect the rotational phase. By detecting this with a detector (PG coil) placed on the device side, the rotation phase is detected and a phase servo is applied to the magnetic disk rotation motor. The structure is such that the timing of each operation can be accurately controlled.

The PC pin is composed of a magnetic pin that guides the 6fl force line of the chucking magnet placed on the Svintort on the side of the device that rotates the magnetic disk to the top surface of the center core of the 611 disk. The PC coil is
This coil is placed close to the center core and detects the magnetic flux induced by the PG bin. Thereby, the rotational state can be electrically detected based on the voltage change induced in the PG coil according to the rotation of the magnetic disk.

(Problem to be Solved by the Invention) However, in the conventional device, when installing the PG coil, the mounting of the holder that holds the magnetic disk, the lid body, etc. facing the PG upper pin is not done by screwing or caulking in position. Since the mounting method was used, it was difficult to perform the mounting and the fine adjustment of the position of the mounting.

In addition, the location where the PG coil is installed is close to and opposite the center core of the magnetic disk, and other mechanisms related to the magnetic disk device are also installed at this location, so there is not enough space to install it. Since there are many factors that hinder work, a method with good workability and more reliable installation was desired.

(Means for Solving the Problems) The present invention has been made for the purpose of solving the above two problems, and is characterized by a detection member for detecting the rotational phase of the recording medium. The device is attached to a supporting portion facing the recording medium, wherein the detecting member is formed with an engaging portion having a small diameter portion in a part thereof, and the supporting portion has an engaging portion that engages with a retaining portion of the detecting member. A fitting hole having a hole or notch through which the small diameter portion of the engaging portion can be inserted is formed in a part thereof, and the small diameter portion of the engaging portion is inserted into the fitting hole through the hole or notch of the support portion. By configuring the detection member to be fixed to the support portion by inserting it into the matching hole and rotating it, the detection member, that is, the PG coil, can be attached by an operation, and the attachment is done by positioning and positioning. The installation is to provide a recorder or a reproducing device that allows for easy fine adjustment of the position.

(Example) The recording or reproducing apparatus of the present invention will be explained below with reference to the respective figures.

FIG. 13 is a perspective view showing an example of a jacket in which a recording medium used in the apparatus of the present invention can be placed.

In the figure, 1 is a jacket containing a recording medium;
A magnetic disk 2 as a recording medium is rotatably housed inside the disk. The center of the magnetic disk 2 is made of synthetic resin and has an engagement hole 3 for a spindle for rotating the disk.
A center core 3 having a shape a is attached and exposed through a central hole bored in the upper and lower surfaces of the jacket. Further, on the lower surface of the center core 3, a magnetic plate 3a is arranged which is magnetically attracted to a magnet arranged on a spindle, which will be described later. In addition, as shown in FIG. 11, the magnetic plate 3a is integrally formed with a protrusion 3b that passes through the center core 3 and is exposed to the upper surface. A rotational phase display member (hereinafter referred to as PG pin) 3b is formed to guide the magnetic flux of the spindle magnet to the upper surface of the center core and to indicate the rotational phase of the disk.

la and lb are disk exposure openings formed at mutually opposing positions on the upper and lower surfaces of the jacket l, respectively;
A record, which will be described later, is recorded from the lower surface side opening 1b.

A stabilizing plate (described later) for stabilizing the contact state between the magnetic disk 2 and the magnetic head can be inserted into the reproduction magnetic head from the upper opening 1a. A shutter 4 for opening and closing these openings is arranged in the openings 1a and lb so as to be slidable in the direction of the arrow. 4a is an engagement hole for engaging with a shutter closing mechanism described later when the shutter 4 is closed.

Further, reference numeral 5 denotes a locking member 1 for locking the shutter 4 in the closed position. Although the details are omitted, a part of it is exposed on the side of the jacket where the shutter 4 is arranged, and as will be described later, when the jacket is inserted. , the lock is released by operating a release member on the jacket holder side.

lc and ld are positioning holes drilled at predetermined locations near the side edges of the jacket l, and are used to position the loading position when the jacket 1 is loaded into a jacket loading section, which will be described later; le is a positioning hole on the bottom surface of the jacket l; This is an operation piece installed to prevent erroneous recording.

Next, the configuration of the apparatus of the present invention will be explained in order with reference to each figure. As a procedure for explanation, first an outline of the entire device will be explained, and then individual mechanisms will be explained in detail.

FIG. 1 is an exploded perspective view showing the basic structure of the jacket loading mechanism in the apparatus of the present invention.

Reference numeral 10 denotes a chassis of the main body of the recording or reproducing apparatus, which is molded with high precision by Gui-casting or the like, and includes a spindle 12 for rotating a disk, and a spindle motor 11 for rotationally driving the spindle 12. A magnetic head 13 that is inserted through the lower side opening 1b of the loaded jacket l and makes contact with the magnetic disk 2 to perform recording and reproduction, a transport mechanism (not shown) for the magnetic head 13, and a positioning mechanism for accurately positioning the jacket at the loading position. Posts 14a, 14b, 14c, etc. are arranged to constitute a jacket mounting section. Each positioning post receives the bottom surface of the jacket when it is loaded and positions the jacket in the height direction, and the positioning post 1
4a and 14b are positioning holes 1c of the jacket.

Projections 141a and 141b are formed to be inserted into the ld so that positioning in the horizontal direction can be performed simultaneously. Note that the positioning post 14a is also used for positioning a stabilizer plate, which will be described later.

Further, at a predetermined location on the upper surface of the peripheral portion of the main body chassis 10, there is a projection 10d for positioning the mounting position of a frame 20 that supports a jacket loading mechanism unit, which will be described later.
screw hole 10a for screwing into foe and mounting position
, 10b, and 10c are respectively formed, and a protrusion 10 that comes into contact with a support plate 42 that supports a stabilizing plate 41 to be described later to regulate its position in the height direction.
F, 10g, ! Oh is formed.

The supporting plate of the stabilizing plate is inserted through the opening 1a of the jacket l loaded in the jacket loading section and positioned in the height direction of the operating position where it comes into contact with the magnetic disk 2 using the above-mentioned protrusions 10g, lOh. The horizontal position is determined by the post 14a and the protrusion 10.
The respective positions are determined by f. Details will be described later.

20 is a holder 30, which will be described later, on the device main body chassis 10.
．． This is a frame for assembling a jacket loading mechanism consisting of a lid body 40.

This frame 20 has a front plate 20a and a right side plate 20b, which are formed by bending a relatively low-rigid metal plate into a substantially U-shape.

The bent pieces 20e and 20f formed at the ends of the left side plate 20c are positioned on the protrusions 10d and 10e on the main body chassis 10, respectively, and then inserted into the screw holes 10b and 10c of the chassis with the screws 15. The bent piece 20d, which is screwed and bent inside the front plate 20a, is screwed into the screw hole 10a on the chassis 10 with the screw 15, so that the main body of the device is supported at three points including two points near the hinge. It is fixed on the chassis 10.

In other words, if the device main body chassis IO is formed with high precision using Gui-casting or the like, the frame 20 can be positioned accurately using the three-point support structure described above, and the metal that forms it also needs to have high rigidity, precision, and strength. I don't. On the other hand, by forming the frame 20 from a thin, flexible metal plate with low rigidity, it is easy to form the frame 20, and it is easy to form the frame 20 by positioning the frame 20 at the time of installation.
Even if stress is generated due to screwing, etc., it can be absorbed by the frame 20, and the attachment to the apparatus main body chassis 10 will not cause deterioration in precision or deformation due to distortion or unnecessary external force.

The frame 20 has ends of both side plates and bent pieces 20f.
A hinge portion 22 for rotatably supporting a jacket holder 30 and a lid body 40, which will be described later, by inserting a spindle 21 into holes drilled in each of the projecting pieces 20g, 20h, and 20i formed at the tips. is configured. Furthermore, since the end portion of the frame 20 is connected by the support shaft 21, even if the frame 20 is made of a weak metal with low rigidity, the hinge portion for supporting the jacket loading mechanism has sufficient strength and strength. Accuracy can be ensured. By using this approximately U-shaped frame 20 and attaching it with three-point support, unlike conventional devices where each side plate was installed separately or connected via the top plate,
Since there is no need to provide a top plate, there are fewer processing steps and the product can be made thinner, making it easier to assemble.Also, since the side surfaces in three directions can be molded and attached at once, the positions between each surface can be determined easily. I can do it.

Further, a control lever 23 for controlling a disk pressing member 36 that presses a center core, which will be described later, is rotatably attached to the left side plate 20c of the frame 20 by a shaft 24, and is always biased clockwise by a spring 25. Protrusion 2
The rotation position is regulated by 01.

Also, on the inside of the front plate is a lock lever 27, which will be described later.
A lock lever 28 and the like for locking the lid 40 and the holder 30 in the closed position are provided, and these will be described later.

Further, 20j engages with an engaging arm 40c of the lid 40, which will be described later, and the lid 40. A protrusion is provided for determining the open position of the holder 30, and a protrusion 20 is provided for regulating the closed position of the holder 30.

Reference numeral 30 denotes a jacket holder that holds the jacket 1 inserted from the outside and transfers it to the jacket loading position on the main body chassis 10 of the apparatus. A guide portion/holding portion 30a for holding the.

30b is formed.

The holder 30 has a hinge protrusion 30c formed on its rear edge.
, 30d is the support shaft 2 of the hinge portion 22 of the frame 20.
1, and is biased by a coil spring 31 in a normally open direction, that is, counterclockwise as seen in FIGS. 1 and 3, and as shown in FIG.
The elastic force in the direction of the support shaft 21 of the frame 20
The hinge portion 30d is constantly pressed against the protruding piece 20h on one side of the plate. This is to prevent the holder 30 from wobbling at the hinge portion and to improve the accuracy of the jacket loading position.

On the upper surface of the holder 30, a disk pressing member 36 (described later) is provided.
Openings 30e and 30f are formed through which various operating members such as the stabilizer plate 41 and the like can pass.

An elastic member (plate spring) 32 as a jacket discharge member is disposed at the rear inside the holder 30, and on the right side, when the jacket l is inserted into the holder 30, it engages with the shutter 4 to open it. A shutter opening member 33 and a shutter closing member 34 formed of an elastic member (a leaf spring) for closing the shutter 4 by the ejection operation of the jacket are arranged. Further, on the rear upper surface of the holder 30, there is an engagement hole 30k for locking the rearward pressing position of the jacket discharge member 32.
is formed.

At the center of the upper surface of the holder, a magnetic disk 2 is mounted on the spindle 12 and is rotated.
Phase detection member (PG coil) 3 for detecting the rotational phase of the disk by detecting the PG pin 3b on the center core 3
5 is placed. In addition, in the opening 30f adjacent to the PG coil 35, there is a disk that presses the top surface of the center core 3 of the disk to forcibly fit it into the spindle when loading the disk into the jacket mounting section on the apparatus main body chassis IO. The pressing member 36 has a substantially middle portion thereof attached to the protruding piece 30g on the holder 30.

It is rotatably arranged around a shaft 37 supported by 30h, and its spindle! A PG coil 35 is installed at the 1 side end.
．． A pressing portion 36a that escapes from the spindle 11 and presses onto the center core 3 of the disk is formed, and the other end is provided with an engaging piece 3 that engages with the control lever 23 on the side surface of the frame 20 described above.
6b is formed. In addition, 30i is a lid body 40 which will be described later.
As is clear from FIG. 2, the protrusion 30j for regulating the relative rotational position with respect to This is a protrusion that prevents the support shaft 37 from being pulled out.
is a relay board that relays a lead wire (not shown) when wiring the output of the PG coil to a servo circuit board (not shown) provided on the device main body side, and is connected to the holder on the other end side of the support shaft 37. The thickness of the support shaft 37 prevents the other end of the support shaft 37 from being pulled out.

As a result, it is possible to prevent the support shaft 37 from being removed by using the circuit board on the holder without caulking or attaching an E-ring to both ends of the support shaft 37, and the configuration can be greatly simplified. can.

Reference numeral 40 denotes a lid body disposed on the outside of the holder 30 so as to be openable and closable together with the holder 30.

The lid body 40 is rotatably attached to the support shaft 21 of the hinge 22 together with the holder 30 via supporting pieces 40a and 40b as hinge parts formed on the rear edge.
The holder 30 is always biased counterclockwise by a plate spring 50a, which will be described later, attached to the front, and the upper engagement portion 401c of the engagement arm 40c on the left side is connected to the projection 30i on the side of the holder 30. By positioning it below the
The relative rotation range is restricted, and by positioning the lower engagement portion 402c of the engagement arm 40c below the protrusion 20j on the side surface of the frame, the open position of both the lid 40 and the holder 30 relative to the frame 20 can be adjusted. Regulated.

Inside the lid 40, there is a stabilizing plate 41 that comes into contact with the magnetic disk 2 through the opening 30e on the top surface of the holder 30 when closed.
is supported via a support plate 42. and support plate 4
2 is attached so as to be vertically movable relative to the lid body 40 by pins 44a, 44b on the back surface of the lid body 40 and an engaging protrusion 42c engaged in a hole 4Qd on the front surface of the lid body, and is always held downward by a leaf spring 50b to be described later. That is, it is pressed toward the device main body chassis IO side.

Further, the support plate 42 includes a positioning projection 10g for positioning the boss 14a1 on the device main body chassis 10 when the lid body 40 is closed;
Adjustable positioning pins 43a to 43c are arranged to abut on the pins 10h and perform positioning in the height direction and horizontal direction.

The detailed support structure of this stabilizer plate will be described later.

Further, a lock pawl 40e is formed on the front surface of the lid 40 to engage with a lock lever 28 disposed at the front of the frame 20 to lock the lid 40 and the holder 30 in the closed position.
At a position facing the engagement hole 30 of the holder 30 on the inside of the upper plate near the hinge 22, there is a cassette ejection member 3 of the holder 30.
A release protrusion 40f for releasing the engagement between 2 and the engagement hole 30j is formed.

Further, 40g is an engaging portion that engages with the control lever 23 when the lid 40 is opened to release the suppressing operation of the disk suppressing member, and 40h, 40i, and 40j are used to assemble the holder 30 and the lid 40 to the frame 20, respectively. In order to attach and detach the fixing screws 15 between the frame 20 and the device main body chassis 10 after the device has been assembled, the hole allows a screw or a screwdriver (not shown) to be inserted. , the lid, holder, and frame all need to be disassembled and removed separately; the lid 40. Holder 30. It can be removed as a jacket loading mechanism unit from the frame 20, and serviceability and workability are greatly improved.

According to the device of the present invention configured as described above, the jacket l is inserted into the holder 30 in the open state in the direction of the arrow IN against the jacket ejection member 32, and after the jacket is stored in the holder 30. By closing the lid 40 toward the apparatus main body chassis 10, the holder 30 is loaded into the jacket loading position on the chassis 10, and by further closing the lid 40, it is locked in the closed position. , the jacket loading operation is completed.

Further, when taking out the jacket 1, by releasing the lock of the lid body 40, the holder 30 is held by the spring 31.
．． The lid body 40 is opened and the jacket is discharged to the outside of the holder by the jacket discharge member 32.

The main structure of the apparatus of the present invention is as described above, and the detailed structure will be explained in detail below.

(1) Lid body 40. Regarding the opening/closing operation of the holder 30, the jacket ejection mechanism, and the shutter opening/closing mechanism, we will first explain the lid body 40. FIG. 2 shows the jacket discharging mechanism and shutter opening/closing mechanism that discharge the jacket 1 to the outside of the holder when the holder 30 is loaded with the jacket, and when the holder is opened.
This will be explained mainly using FIGS. 3 and 4.

FIG. 2 is a top view of the jacket loading mechanism unit viewed from above, and FIGS. 3(a) to 3(d) are side views in different operating states.

Lid body 40. In the open position where the holder 30 is opened and the jacket 1 can be attached and detached, the holder 30 is rotated counterclockwise as seen in the figure by the coil spring 31 disposed on the hinge 22, as shown in FIG. 3(a). The lid body 40 is disposed on the back surface thereof, and is further rotated counterclockwise with respect to the holder 30 by a leaf spring 50a that presses the upper surface of the holder 30 relatively. These open positions are shown in Figure 5 (a
), the gap between the lid body 40 and the holder 30, that is, the rotation angle is the upper engaging portion 40! of the engaging arm 40c of the lid body 40. c and the protrusion 30i of the holder 30, and the rotation angle of the lid 40 relative to the chassis lO is further regulated by the lower engagement portion 402c of the engagement arm 40c and the protrusion 20j. The open positions of the lid 40 and the holder 30 are determined by these interactions.

On the other hand, the jacket ejection member 32 disposed inside the holder 30 has one end fixed to the rear edge inside the holder 30, and the other end formed with a jacket pressing part 32a that comes into contact with the rear surface of the jacket l inserted into the holder 30. has been done. Further, an engaging portion 32b that can be engaged with the engaging hole 30 on the rear upper surface of the holder is formed on the upper surface of the other end. Also, this elastic member 32
is attached in a biased state so as to always maintain upward pressure, that is, the back surface of the upper plate of the holder 30. Therefore, when inserting or ejecting the jacket, the engaging portion 32b
moves while sliding while being pressed against the back surface of the upper plate of the holder 30.

In this state, when the jacket 1 is inserted from the jacket insertion opening of the holder 30, the jacket ejection member 32 is pressed backward against its elasticity and rotates in the direction of the arrow in FIG. When it reaches the position facing the engagement hole 30k of the holder 30, it is engaged into the engagement hole 30 by the upward pre-pressure.

As a result, the jacket ejecting member 32 is locked at the pressed position, and the jacket l is kept housed in the holder 30 without being ejected from the holder 30.

This state is shown in FIG. 3(b).

Note that when the jacket l is inserted into the holder 30, the holder 3
The front edge of the shutter 4 comes into contact with the shutter opening member on the inner surface of the jacket, and the shutter 4 is opened by the operation of inserting the jacket. Further, prior to this operation, a shutter lock release protrusion (not shown) on the inner surface of the holder engages with the shutter lock lever 5, so that the shutter 4 is unlocked.

After storing the jacket and closing the lid 40, the image shown in Fig. 3 (C) will appear.
As shown in FIG. 2, the holder 30 is also closed via the leaf spring 50a against the coil spring 31, and the holder 30 is rotated until its lower surface abuts against the protrusion 20k.

The jacket 1 within the holder 30' is positioned vertically and horizontally by positioning posts 14a to 14c on the chassis 10. Then, the magnetic head 13 is inserted through the opening 1b with the shutter 4 open and brought into contact with the disk 2.

Further, by closing the lid 40 against the leaf spring 50a, the lid 40 is locked in the closed position by a locking mechanism to be described later. Further, the protrusion 40f on the lower surface of the lid body 40 is inserted into the hole 30 of the holder 30, and the engaged portion 32b of the jacket discharge member 32 is disengaged. As a result, the jacket discharge member 32 comes into a state in which the pressing portion 32a is pressed against the rear surface of the jacket 1 due to its elasticity.

This pressing also has the effect of eliminating looseness between the positioning posts 14a, 14b and the positioning holes lc, ld of the jacket 1. This state is shown in FIG. 3(d).

In this state, the stabilizing plate 11 attached to the lid body 40 side
is inserted into the opening ld of the jacket 1 through the opening 30e of the holder 30, and the contact between the magnetic head 13 and the disk 2 can be stabilized.

Further, at a position facing the center core 3 of the disk 2 on the holder 30, there is a PC for detecting the rotational phase of the disk.
Coil 35 is positioned at a predetermined detection position.

In the process of closing the holder 30 described above, when the center core 3 of the disk 2 is attached to the spindle 12, the disk pressing member 36 disposed on the holder 30 operates to push the center core 3 toward the spindle 12. An operation is performed to forcefully fit the two.

These individual operations will be described later. Therefore, when the lid body 40 is next unlocked and opened together with the holder 30, the elastic member 32 serving as the jacket discharge member returns elastically in the direction opposite to the arrow A, as shown in FIGS. 2 and 3(a).
The jacket 1 is returned to the position , and the jacket 1 is ejected to the outside of the holder 30, that is, in the direction opposite to the arrow IN, and can be easily taken out.

Further, a shutter closing mechanism is provided which automatically closes the shutter 4 which has been opened by the operation of ejecting the jacket 1 from the holder 30.

As shown in FIGS. 1 and 2, as described above, the shirt opening member 34 formed of a leaf spring is disposed on the left inner surface of the holder 30. In the shirt shutter closing member 34, one end of the leaf spring on the inside of the holder is fixed to the left inner surface of the holder by caulking or the like, and the other end on the jacket insertion opening side is engaged with the engaging portion 4a of the shutter 4. A protrusion 34a is formed by bending. The protrusion 34a has an inclined surface on the jacket insertion side, and when the jacket I is inserted, the front edge of the shutter 4 can easily climb over and be introduced into the engagement hole 4a.

Therefore, when the jacket 1 is stored in the holder 30, the shutter 4 is locked by the jacket closing member 34, so the shutter 4 can be closed by the operation of ejecting the jacket 1 from the holder 30. . Further, as is clear from the enlarged view of FIG. 4, the free end 34b of the shirt closure member 34 extends outward from the side surface of the holder 30, and the free end 34b extends outward from the side surface of the holder and the protrusion 30 cut up on the side surface.
It is sandwiched between 1 and 1 without being fixed. As a result, when the jacket l is inserted and the shirt sleeve opening member 4 is pressed outward from the side of the holder, the free end will not protrude to the side and will not interfere with other members. In addition, since both ends of the leaf spring are restricted, a stronger elastic engagement force can be obtained compared to one where the other end is free.Furthermore, when the leaf spring is bent, its free end 34b is fixed. Since the plate springs are free of stress, the stress applied to the plate springs can be released, and the plate springs, that is, the shirt closure members, have excellent durability.

(2) Regarding the locking mechanism of the lid 40 (holder 30) and the means for detecting the completion of loading of the jacket, the lid 40. Figures 5(a) to 5(a) show a locking mechanism for locking the holder 30 in its closed position and a detection mechanism for detecting that the jacket l has been reliably loaded into the jacket loading section and that the holder and lid have been locked. This will be explained using FIG. 5(d).

FIG. 5 shows the structure of the back side of the front plate 20a of the frame 20. On the back side of the front plate 20a of the frame 20, a lock lever 28 for locking the lid body 40 in the closed position is connected to its elongated holes 28a, 28b. Pin guide 20 on front plate 2Oa
1a and 202a so as to be slidable left and right, and an operating portion 28c at one end thereof protrudes to the side of the frame 20 and is attached for operation.

A protrusion 28d extending from the upper edge of the lock lever 28 is provided with a lock pin 28e that engages and locks the lock pawl 40e when the lid 40 is closed.

Further, a lock lever 27 for holding the lock lever 28 in the unlocked position is rotatably attached at one end to the guide bin 202a, and is connected to the lock lever 28 by a spring 29a.

The other end of the locking lever 27 has a protrusion 27a that engages with the lower edge of the lid 40 and is pushed down when the lid 40 is closed.
is formed at a predetermined position on the upper edge and engages with an engagement piece 28f bent on the side of the lock lever 28, so that the lock lever 28 is placed in the left position (unlocked position) when viewed from the figure. An engaging stepped portion 27b is formed to engage with.

Also, at the left end of the front panel 20a, there is a jacket l.
A leaf switch SW is attached to detect when the cassette is loaded at a predetermined cassette loading position and when the lid 40 is completely locked. In the guide bin 201a, when the holder is opened, a switch control lever 26 for operating the leaf switch SW is always biased counterclockwise by a spring 29b depending on the presence or absence of a jacket in the holder and the movement of the lock lever 28. It is arranged so that it can rotate freely. An engaging portion 26a that is pressed by the lower surface of the jacket in the holder 30 is formed at one end of the control lever 26, and an operating portion 26b for operating the leaf switch SW is formed at the other end.
Furthermore, a notch 26c and a protrusion 26d are formed approximately in the middle to engage with an engaging piece 28g bent on the side surface of the lock lever 28, respectively.

FIG. 5(a) shows the open or ejected state in which the operating portion 28c of the lock lever 28 is pushed to the left as viewed in the figure and the lock bin 28e is separated from the lock claw 40e of the lid 40. Lid body 40. Both holders 30 are in an open state.

On the other hand, as the lock lever 28 moves to the left, the locking lever 27 is rotated counterclockwise via the spring 29a, and the protruding piece 27a is projected upward, that is, to a position where it can engage with the lower surface of the jacket. It is in a state of being The lock lever 28 is locked at the left position, that is, at the unlocked position, by the engagement piece 28f being locked with the engagement step 27b of the locking lever 27. Further, the switch control lever 26 is rotated counterclockwise by a spring 29b, so that the operating portion 26b is separated from the leaf switch SW, and the engaging portion 27a is projected to a position where it can be engaged with the lower surface of the jacket.

In this state, when the lid 40 is closed to the main body of the apparatus, in the process, the holder 30 is first moved to a predetermined loading position, as shown in FIG. 5(b). At this time, if the jacket is stored in the holder 30, the switch control lever 26 rotates clockwise against the spring 29b as the engaging portion 26a is pushed down by the lower surface of the jacket, and the operating portion 26b is rotated clockwise. Move to a predetermined position adjacent to switch SW.

Subsequently, by closing the lid body 40 to the lock position,
The lock claw 40e is the lock pin 2 of the lock lever 28.
The position is opposite to 8e. On the other hand, the locking lever 27 is
The lower front edge of the lid body 40 presses the engaging portion 27a and rotates counterclockwise against the spring 29a, releasing the lock lever 28 from the engaging stepped portion 27b. The lock lever 28 is slid to the right by the elasticity of the spring 29a, and the lock pin 28e is moved to the lock claw 4 of the lid body 40.
0e to lock the lid body 40 and holder 30 in the closed position.

Also, by sliding this lock lever 28, the engaging piece 2
8g rides on the upper surface of the protrusion 26d of the switch control lever 26 and rotates it clockwise.

As a result, the leaf switch SW is closed, it is detected that the jacket I is loaded and the lid is completely locked, and recording, reproducing operations, etc. are performed by a control circuit (not shown). This state is shown in FIG. 5(c).

By the way, the holder 30. If the jacket is not stored in the holder 30 when the lid body 40 is closed, the switch will not be activated when the holder 30 is closed to the position shown in FIG. 5(b) because the jacket 1 is not present. The control lever 26 is not rotated, and therefore the operating portion 26b is not moved from the position spaced apart from the leaf switch SW. In this position, the notch 26c of the switch control lever 26 faces the engagement piece 28g of the lock lever 28. Therefore, the lid body 40 is closed to the lock position, and the lock lever is
28 slides to the right and locks it, the engaging piece 28g is engaged in the notch 26c of the switch control lever 26, the switch control lever 26 does not rotate, and the leaf switch SW is closed. Not done. As a result, it is detected that the jacket is not housed in the holder 30 when the lid is completely locked. This state is shown in FIG. 5(d). Further, in this case, since the switch control lever 26 is locked by the lock lever 28, there is no possibility of rattling due to vibration or the like and no malfunction of the switch SW.

When the lid body 40 and the holder 30 are opened, the operation part 28c of the lock lever 28 is pressed and slid to the right unlocked position.

By unlocking the lid 40, the lid 40 and the holder 30 are opened, and the locking lever 27 also rotates clockwise with the opening operation of the lid 40, so that the engagement step 27b
The engaging piece 28f of the lock lever 28 is locked, and the lock lever 28 is locked to the unlocked position and returned to the position shown in FIG. 5(a).

Since the lock lever 28 is held at the unlocked position until the lid 40 is closed, the lock lever does not become a load when the lid is closed, and the closing operation can be performed smoothly.

(3) About the disk pressing mechanism When closing the holder 30 to the device main body chassis lO and mounting the disk in the jacket l stored therein to the spindle 12, the center core 3 of the disk is pressed toward the spindle 12. As mentioned above, the disc pressing mechanism 36 for forcibly fitting the discs is provided.

In a device like this device, which fits the hole in the center core 3 into the spindle 12, a pressing force of about 100-odd grams is required to securely fit the center core 3 into the spindle. If the disk is loaded by simply closing the holder, there is a risk that the center core and spindle may be misaligned or the center core may be uneven, resulting in incomplete loading. A disk pressing mechanism is provided to prevent this.

Referring to FIG. 1, the opening 30 on the top surface of the holder 30
A disk pressing lever 36 is rotatably supported approximately in the middle of a shaft 37 disposed between the supporting pieces 30g and 30h on both sides of f, and is rotated by a leaf spring 50d attached to the back surface of the lid 40. The disk pressing portion located on the center core 3 is urged clockwise, that is, in a direction in which the disk pressing portion located on the center core 3 is separated from the spindle 12. This spring may be weak because it only needs to separate the disk pressing portion from the center core of the disk.

As is clear from FIG. 2, the disk pressing portion 36a is
The upper end of the spindle 12, the left side, has a pressing protrusion formed at its tip in order to avoid the PG detection member 35 and press the upper surface of the center core 3 at two points on both sides.

It is composed of right arms 361a and 362a.

At the end opposite to the spindle 12, a frame 2 is attached.
An engaging piece 36b that engages with the control lever 23 rotatably attached to the shaft 24 is formed on the left side surface. The control lever 23 is biased clockwise by a spring 25 that is stronger than the leaf spring 50d that biases the disk pressing member 36, and its rotational position is restricted by a protrusion 201 on the side surface of the frame 20.

Now, in the open state shown in FIGS. 6(a) and 7(a), when the jacket l is inserted into the holder 30 and the lid body 40 is closed, the holder 30 first comes into contact with the lid body 40 and the plate as described above. It starts moving to the jacket loading position while maintaining a predetermined distance by the spring 50d. In the open state, the disk pressing lever 36 is moved by the disk pressing portion 36a (361a) by the leaf spring 50d.

362a) is rotated in a direction away from the center core 3 of the disk 2. Therefore, when inserting the jacket l into the holder 30, the disk pressing part does not get in the way, and operability is good.

FIG. 6(b) shows the state immediately before the holder 30 reaches the closed position.

As shown in FIG. 7(b), the engaging piece 36b of the disc pressing lever 36 comes into contact with the protrusion 23a at the tip of the control lever 23, and the holder 30 is further closed, so that the disc pressing lever 36 is The engaging piece 36b is pushed up and rotated clockwise by the control lever 23, and the disk pressing portion 36a presses the center core 3 of the disk 2 toward the spindle, forcing it to fit into the spindle 12. In order to perform this pressing operation, the spring 25 for biasing the control lever 23 needs to be stronger than the spring 50d for separating the disk pressing lever 36 from the disk.

When the holder 30 is further lowered to the closed position, the disk pressing lever 36 does not rotate any further after the center core 3 is fitted to the spindle 12, and its engagement piece 36b moves the control lever 23 to the spring 25. Push down against this and rotate counterclockwise. This makes it possible to absorb the extra pressing stroke of the disk pressing lever 36 after the fitting operation between the center core 3 and the spindle 12 is completed.

Therefore, damage to the center core 3 and the disk pressing mechanism can be prevented.

The holder 30 is moved to a predetermined loading position, and the lid 40 is closed against the leaf spring 50a disposed between it and the holder 30, and the lid 40 is locked in the closed position as described above. When the position is reached, as shown in FIG. 7(C), the engaging part 40g on the lower edge of the lid body 40 presses the end engaging part 23b of the control lever 23, which is further rotated counterclockwise. move. As a result, the protrusion 23a of the control lever 23 is disengaged from the engagement piece 36b of the disc pressing member 36, the disc pressing lever 36 is released from the pressed state by the control lever 23, and is rotated counterclockwise again by the leaf spring 50d. Then, as shown in FIG. 6(c), the disk pressing portion 36
A is separated from the center core 3. Therefore, after the center core 3 of the disk 2 is fitted to the spindle 12, the pressing load is released, and unnecessary rotational load is not applied thereafter, making it possible to perform smooth and reasonable disk rotation control.

Also, press the operating part 28c of the lock lever 28 to
0, and remove the lid 40. The operation when the holder 30 is opened will be explained.

Lid body 40. Since the holder 30 is opened by the coil spring 31 of the hinge 21, the control lever 23 is rotated clockwise by the spring 25, as shown in FIG. 36
The disk press lever 36 is brought into contact with the engagement piece 36b and held in place. Therefore, even when the lid body 40 and the holder 30 are opened, the disk press lever 36 is engaged with its biasing spring 50d in the release position, that is, the non-press position. This allows the disk pressing lever 36 to be reliably held so that it does not move toward the center core 3 or wobble due to vibration or the like.

Then, by further opening the holder 30, the center core 3 of the disk 2 is detached from the spindle 12, and
The disk pressing lever 36 also completely separates from the control lever (-23) and returns to the position shown in FIGS. 6(a) and 7(a).

As described above, the disk pressing mechanism of this device is
is closed and temporarily presses the disk only when it is installed on the spindle, and is released from the holder in other situations, so there is no sudden load change on the spindle when loading or unloading the disk. It has excellent reliability and operability. According to the disk suppression mechanism of the present invention, the disk suppression lever is always biased in the direction of releasing the pressure on the center core, and it is only necessary to press the center core with an external force when loading a disk. The spring for releasing the disk suppression lever should be as strong as necessary to release the pressure (it can be weak, and there is no risk of deforming or rattling other parts. In other words, it should always be biased in the direction of pressing the disk. This type of mechanism requires a strong pressing force, so a large force is also required to release it, and a strong force is required to maintain the release position even after the jacket loading operation is completed.Therefore, There is a problem that the accuracy of the mechanism after loading is likely to deteriorate.According to the device of the present invention, the disk suppression lever 36
The control lever 23 that applies a pressing force to the lid only operates when the lid is closed, and does not have the same effect on the disk pressing member or other members on the holder in both the open and open (loaded) states. The above problem does not occur.

(4) Regarding the stabilizer plate The stabilizer plate 41 attached to the back surface of the lid body 40 via four support plates is used to hold the holder 3 when the holder 30 and the lid body 40 are closed.
As described above, the magnetic head 13 is provided to stabilize the head touch by coming into contact with the magnetic head 13 at a position facing the disk 2 through the opening 30e of the jacket and the opening 1a of the jacket. A specific supporting method will be explained below using FIGS. 3 and 8 to 10.

FIG. 8 shows the structure of the lid body 40, and to make the internal mechanism easier to understand, the lid body itself is shown in dashed lines.

The stabilizer plate 41 is attached to the cover body 40 in a suspended manner via a support plate 42. As is clear from FIG. 3, a groove 41a is formed in the stabilizing plate at a position facing the magnetic head 13 in accordance with the moving path of the head.

The support plate 42 has a long hole 42a at the rear thereof on the hinge side.

Bottles 44a and 44b with 42b set up on the lid 40
It is arranged so that it can be moved slightly in the vertical and horizontal directions by being fitted into the cover body and by engaging the engagement protrusion 42c on the front side, which is the jacket insertion opening side, with the hole 40d on the front surface of the cover body. . The plate 50b is always biased downward, that is, toward the holder 30 side.

Although not shown, the bottle 44a.

Needless to say, a locking member is attached to the tip of the support plate 44b to prevent it from falling off, or a large-diameter portion is formed in the bottle itself to prevent the support plate from falling off. .

Further, a notch 42d is formed at the rear edge of the support plate 42 to engage with a bottle lot having a conical tip on the chassis when loaded onto the apparatus main body chassis IO.

Also, the engagement protrusion 4 of the support plate 42 in the engagement hole 40d of the lid body 40
As shown in FIGS. 9 and 10, the engaging portions 2c are formed with inclined engaging portions 401d and 401d. Therefore, when the lid body 40 is open, the support plate 42 is pressed toward the holder by the leaf springs 50b, 50b, 50b, and the engagement protrusion 42c engages the engagement portion 401.
d, 401d, and is positioned at the center of the engagement hole 40. This opens the lid and stabilizes the plate 41.
Even when the stabilizer plate 41 is separated from the disk, the mounting position of the stabilizing plate 41 can be regulated, and when the stabilizing plate 41 is mounted, the mounting position may vary due to positional deviation before mounting, or engagement with the positioning means may be prevented. Care has been taken to avoid any inconveniences such as incompleteness.

As is clear from FIGS. 8, 9, and 10, the support plate 42 is positioned with respect to the apparatus main body chassis 10 by positioning pins 43a to 4 screwed into three locations on the support plate 42.
3c to the positioning posts 14a-14 on the chassis 10.
This is done by engaging the notch 42d with the bottle 10. Positioning bin 43a~
As shown in FIGS. 9 and 10, 43c is a wave-shaped washer 431a with a distal end protruding downward from the support plate 42.
-4310 etc., and by adjusting the amount of screwing in, the position of the support plate, that is, the stabilizing plate 41 can be adjusted. Further, the bottle 43a has a conical projection formed at its tip.

Therefore, the holder 30. When the lid body 40 is closed,
As is clear from FIGS. 3 and 10, the support plate 42 connects the positioning bins 43b and 43c to the chassis 10, respectively.
The notch 42d is placed on the upper protrusion log, loh, and the protrusion 10
f, the positioning pin 43a is inserted into the positioning hole l of the jacket.
The positioning posts 14a fitted in the positioning posts 14a are pressed into engagement with the respective leaf springs 50b, thereby positioning them at the operating position. As a result, the positioning of the stabilizer 41 and the chassis 10 and the positioning of the jacket can be performed with one positioning member, and the position of the stabilizer, which requires highly accurate setting with respect to the jacket, can also be accurately regulated. . At this time, the mounting position of the support plate 42 is set so that it is raised toward the lid 40 side against the leaf spring 15b, so that the engagement protrusion 42c is engaged as shown in FIG. Slope 4 of matching hole 40d
01d and 401d so that positioning on the lid body 40 side does not interfere with positioning on the chassis IO.

With the above configuration, the vertical positioning of the support plate 42, that is, the stabilizing plate 41 is performed using the positioning post 14a and the protrusion 10g.
, 10h, and horizontal positioning is performed by the positioning post 14a and the bin 10f.

(5) Regarding the rotational phase detection member (PG) The rotational phase detection member (PG) 35 that detects the rotational phase of the disk 2 is
The spindle 12 is arranged in a position close to and facing the center core 3 of the disk 2, and the magnetic bottle 3b on the center core
The rotational phase of the disk is detected by detecting the magnetic flux induced from the spindle magnet 12b arranged in the spindle magnet 12b.
As is clear from FIG. 11, the detection bin 353a and the part 3
A detection coil is wound around a yoke 353 consisting of 53b,
Further, a magnet 354 is disposed on the opposite side of the collar portion 353b. This magnet is used to strengthen the magnetism detected by the PG coil 352.

In other words, the polarity of the magnet 354 is set so that it acts to draw the lines of magnetic force induced from the magnet 12b on the spindle 12 through the magnetic bottle 3b into the detection coil 352. 12b should be set appropriately according to the polarity of the coil.This allows you to obtain a sufficient level of the very weak PG detection signal without increasing the number of coil windings as in the conventional case. Highly sensitive detection can be performed without causing problems such as an increase in the size of the coil and yoke due to the increase in the number of noises, and deterioration of the S/N ratio due to the incorporation of noise.

In particular, since various members are arranged on the center core 3, including a disk pressing member for pressing the center core 3 and attaching it to the spindle, miniaturization of the PG detecting member is extremely effective.

In this embodiment, the magnet 354 is separately arranged on the yoke 353, but the yoke itself may be magnetized and used as a magnet (the same effect can be obtained).

The yoke 353 to which the above-mentioned PG coil 352 is attached is
It is attached to the upper surface of the holder at a position facing the center core 3 via the PG holder 351, and its attachment structure will be explained as will be clear with reference to both the top view in FIG. 2 and the perspective view in FIG. 12. In addition, a hole 30m for attaching a PG detection member is formed on the upper surface of the holder 30, and a notch 30n, which is narrower in width than the diameter of the hole 30m and connected to the opening 30e, is formed in a part of this hole. ing.

On the other hand, the PG holder 351 is formed with an engagement groove 351a on its outer periphery, which has a diameter equal to or slightly larger than the hole 30m and a width approximately equal to the thickness of the upper plate of the holder. Small diameter portion 3 that can pass through the notch 30n
51b is formed.

Therefore, when attaching the PG detection member 35 to the holder 30, the small diameter portion 3 of the engagement groove 351a of the PG holder 351
51b into the mounting hole 30m from the opening 30e side through the notch 30n, and from this state, rotate the PG holder approximately 90 degrees in the direction of arrow a to insert the small diameter portion 351b into the notch 30m.
By moving it to a position where it does not face n, it can be held within the mounting hole.

In addition, when the PC holder 351 is inserted into the mounting hole 30m,
It is designed to be at the optimum position by rotating 0", but the center of rotation at the engagement groove part and PG
Make the joke mounting position slightly eccentric (possibly, P
By rotating the G holder left and right with it fitted into the mounting hole 30m, the magnetic pin 3b on the center core 3
The position of the PG coil can be adjusted. In the figure, 351c is a hole for engaging an adjustment jig when rotating the PG holder 351.

A further feature of this PG mounting structure is the means for positioning its operating position. In FIG. 11, with the holder 30 closed and the center core 3 of the disk mounted on the spindle 12, the PG holder 35 is
The lower surface of the PG holder 351 contacts the upper end of the non-rotating support shaft 12a of the spindle 12, and the PG holder 351 can be positioned in the vertical direction by the spindle shaft. The upper end of the spindle is a fixed shaft that rotatably supports the spindle 12 via a bearing 12c, and the rotation of the spindle is not hindered by engagement with the PG holder 351.

This makes it possible to regulate the position of the PG coil with respect to the spindle that supports the center core 3 without providing a separate member for positioning the PG holder 351 and without being affected by errors caused by the hinge 22 of the holder 30, etc. Therefore, positional accuracy can be easily obtained.

In addition, due to the lifting of the holder 30, etc., the PG holder 351
so that it does not rise above the upper end of the spindle and cause variations in the distance from the magnetic bottle 3b of the PG joke center core.
When the lid body 40 is closed, the PG holder 351 is moved by the leaf spring 50c provided inside the lid body 40 in response to the closing of the lid body 40.
Since a part of the PG is pressed against the support shaft 12a of the spindle 12, the positional relationship between the PG and the spindle is reliably maintained with accuracy.

In addition, 12b in the figure is a cap for attaching and positioning the spindle 12 to the support shaft 12a.

(6) Regarding the configuration of the biasing springs of each mechanical part In the above description, in this device, the leaf spring 50a arranged between the lid body 40 and the holder 30, and the support plate 42 to which the stabilizing plate 41 is attached are used. Leaf springs with four functions are used: a leaf spring 50b that biases the holder side, a leaf spring 50C that biases the PG detection member toward the spindle, and a leaf spring 50d that biases the disk pressing lever 36 in the release direction. However, as shown in Figure 8,
These leaf springs are integrally molded on a leaf spring substrate 50 attached to the front surface of the lid body 40. Therefore, by simply attaching the leaf spring substrate 50 to the lid body 40, all of the plates can be attached and positioned at predetermined operating positions at the same time.

Further, the pressing force of each leaf spring can be individually set by appropriately changing the position of the bent portion of the leaf spring.

In addition, the leaf springs are also dispersed so that the pressing force of the springs is not concentrated on a part of the lid or holder, so unnecessary force is not applied to other mechanical parts (to ensure a stable mechanical part). realizable.

(Effects of the Invention) As described above, according to the recording or reproducing apparatus of the present invention, the detection member, that is, the PG coil, for detecting the rotational phase of the magnetic disk as a recording medium is mounted on a predetermined support close to the electric disk. When attaching it to the part, an engaging part having a small diameter part formed in the detection member is fitted into a hole through which the small diameter part of the detection member formed in the support part can be inserted, or a fitting hole having a notch part. It can be installed by simply holding it in place without using screws or other dedicated support means, and the installation can be easily fine-adjusted in position.

Therefore, it is extremely effective in recording or reproducing devices that are small and require high precision.

According to the above-mentioned embodiments, the present invention is applied to a still video system, but the present invention is not limited to this, and can be applied to any device that requires the attachment of a detection member. The present invention can also be applied to devices.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an embodiment in which the present invention is applied to a recording or reproducing device, Fig. 2 is a top view of this embodiment, and Figs. 3(a) to 3(d) are jackets. tJF output means,
A side view for explaining the configuration and operation of a holder,
FIG. 4 is a perspective view of the shutter closing mechanism, FIGS. ) ~ Figure 6 (C)
, FIGS. 7(a) to 7(d) are front and side views for explaining the structure and operation of the disk suppression mechanism, and FIGS. 8 to 10 are the stabilizing plate support mechanism and leaf spring. 11 and 12 are perspective views and side views for explaining the configuration of the PG detection member, and FIG. 13 is a magnetic disk used in the device of this embodiment and its jacket. FIG. l・・・jacket
2... Magnetic disk 3... Center core 3b... PG bin 4...
・Shutter IO...Device main body chassis +2
...Spindle 13 ...Head 1
4a to 14b...Positioning post 20...
...Frame 22...Hinge 23...
... Control lever 26 ... Switch control lever 27 ... Locking lever 28 ... Lock lever 30 ... Holder 32 ... Jacket Ejection lever 34...
・Shutter closing lever 35... PC detection member 36... Disk pressing lever 38... PG relay board 40... Lid body 41... - Stabilizing plate 42...Supporting plates 43a to 43c...Positioning bin 50...
...Plate spring SW...Jacket loading lock detection switch 3
Figure 7 (b) of 0 Figure 1/Figure 72

Claims (1)

[Claims] A device for attaching a detection member for detecting a rotational phase of a recording medium to a support portion facing the recording medium,
The detection member is formed with an engagement part having a small diameter part in a part thereof, and the support part is fitted with the engagement part of the detection member and allows the small diameter part of the detection member to be inserted into the part thereof. A fitting hole having a hole or notch is formed, and the detecting member is rotated after the small diameter part of the engaging part is inserted into the fitting hole through the hole or notch of the support part. A recording or reproducing device characterized in that it is configured to be fixed to the support portion.