JPH0355166Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a rotary drive device suitable for application to CD players and the like.

[Conventional technology] CD players, etc., have different types of
For example, there are types in which the optical disk is mounted horizontally and types in which the optical disc is mounted almost vertically.

Stationary types are generally horizontally mounted types. In contrast, portable types such as cassette tape recorders are primarily vertically mounted.

Therefore, the structure of the rotary drive device for driving the optical disk is slightly different between the horizontal mounting type and the vertical mounting type.

The rotary drive device used in a horizontally mounted CD player will be explained with reference to FIG.

In FIG. 7, 10 indicates the rotary drive device as a whole. Rotating shaft 2a of drive motor (spindle motor) 2 attached and fixed to mechanical chassis 1
A turntable 4 is attached to the.

A bearing portion 5 provided on the center hole side of the turntable 4 is fixed to the rotating shaft 2a.

As shown in the figure, the bearing part 5 is configured as a cylindrical body with a bottom, and a fitting body 11 for the optical disk 7 is mounted in a recess formed by the bearing part 5.

The fitting body 11 is mounted so as to be freely rotatable in the direction of the rotational axis and to rotate integrally in the rotational direction.

Therefore, this fitting body 11 has a shaft through hole 12 formed in its center, and an internal flange 14 having an inclined surface 13.
An engagement piece 15 is formed in a part of the engagement piece 1.
5 is engaged with one end of the bearing portion 5 to rotate together with the turntable 4.

A coil spring 16 as shown is interposed between the bearing portion 5 and the fitting body 11, so that the fitting body 11 is constantly displaced upward.

The optical disc 7 is mounted on the turntable 4. In that case, unless the optical disc 7 is mounted with its rotation center completely aligned with the rotation center of the turntable 4, correct information cannot be reproduced from the optical disc 7.

Therefore, the rotation hole 8 of the optical disk 7 is
It is attached to the turntable 4 while sliding using the inclined surface 13 of 1 as a guide. By forming the inclined surface 13 in this way, centering becomes easy and reliable. It is chucked by the magnet 9 in the centered state.

The axial length of the inclined surface 13 of the fitting body 11 does not need to be very long. This is because the optical disc 7 is configured to fall onto the turntable 4 from almost directly above the rotating shaft 2a when the optical disc is mounted.

On the other hand, in the type in which the optical disk 7 is mounted vertically, the rotation drive device 10
The inclined surface 13 formed on the fitting body 11 used for
is selected to be more than twice as long.

That is, as shown in FIG.
is mounted and fixed on the mechanical chassis 1 so that its rotating shaft 2a faces in the horizontal direction.

The fitting body 11 used at this time has its inclined surface 1
3 is made longer by a predetermined length than shown in FIG. 7.

This is because when the optical disk is mounted, the optical disk 7 approaches the fitting body 11 from an oblique direction as shown in the figure, so if the inclined surface 13 is not long to a certain extent,
This is because the optical disc 7 cannot be properly mounted on the turntable 4.

[Problems to be Solved by the Invention] As described above, in the past, due to the difference in the mounting direction of the optical disk, it was necessary to separately prepare the fitting bodies 11 used in the rotary drive device.

Therefore, this invention solves these conventional problems and proposes a rotary drive device having a shared structure.

[Technical means for solving the problem] In order to solve the above-mentioned problem, in this invention, the center hole of the sheet-like recording medium is fitted into the frame-accommodating recess of the turntable connected to the rotating shaft. A mating piece is removably housed, and a pair of mating parts with different lengths of mating surfaces are formed in this mating piece, and the mating part is selected depending on the mounting state of the recording medium. It is characterized by being made as follows.

[Function] When the recording medium is mounted in a horizontal state, the mating piece is placed in the accommodation recess so that the recording medium is mated by the first mating portion having a short mating surface. It will be installed.

On the other hand, when the recording medium is installed in a vertical position, the mating piece is placed in the accommodation recess so that the recording medium is fitted by the second fitting part with the longer length of the fitting surface. will be installed on the

Thereby, a single fitting piece can be used as a fitting body for a plurality of rotary drive devices of different types.

[Example] Next, a case in which an example of the rotary drive device according to the invention is applied to the above-mentioned CD player will be described in detail with reference to FIG. 1 and subsequent figures. Therefore, as the sheet-like recording medium, an optical disk is used as described above.

FIG. 1 shows a case in which this invention is applied to a horizontally mounted rotary drive device, and FIG. 2 shows a case in which this invention is applied to a vertically mounted rotary drive device.

In this invention, a new configuration is adopted for the housing recess 20 corresponding to the conventional bearing part 5 and the fitting piece 30 corresponding to the fitting body 11.

As shown in FIG. 3, the housing recess 20 is configured as a relatively deep recess, and a shaft insertion portion 21 is formed in the bottomed center portion thereof.

As shown in FIG. 4, on the upper open end side of the housing recess 20, a plurality of protrusions 22a to 22c, three in this example, having a predetermined width and length are arranged to protrude inward of the recess. It is formed.

A stopper 23 as shown in FIG. 3 is formed on one of the inner protrusions 22a by being bent downward.

On the other hand, the fitting piece 30 functioning as a chucking member has a fitting part 32 having a truncated conical shape in both the upper and lower directions, with respect to the main part 31 having a predetermined thickness as shown in FIG. 33. The insides of the fitting parts 32 and 33 are both hollow.

Of the fitting parts 32 and 33, the one with the shorter axial length and therefore the shorter fitting surface (slope) is the first fitting part 32, and the longer one is the second fitting part 33. , the axial length of the second fitting portion 33 is the first
The length is selected to be approximately twice that of the fitting portion 32 of. However, this length relationship is just an example.

A shaft through hole 34 is formed in the shaft center of the main portion 31 . This through hole 34 is connected to the rotation shaft 2 of the drive motor 2.
This is the insertion hole of a.

A plurality of engagement protrusions 35a to 35c in this example, which protrude outward as shown in FIG. 6, are integrally formed on the outer peripheral surface of the main part 31.

The main portion 31 and the fitting portions 32 and 33 may be integrally formed or may be formed separately.

Here, since the fitting piece 30 configured in this manner is housed and fixed in the above-mentioned accommodation recess 20, the fitting piece 30 is set to a size that can be accommodated in the accommodation recess 20. There is.

Therefore, first, the outer diameter of the main portion 31 is
The diameter is selected to be approximately equal to the diameter determined by the tips of the protrusions 22a to 22c.

The protrusion length of the engagement protrusions 35a to 35c is the same as the notch recesses 25a to 25c formed in the accommodation recess 20.
(Fig. 4).

Further, its width is slightly narrower than the width of the protrusions 22a to 22c.

In order to accommodate and fix the fitting piece 30 in the accommodation recess 20, the rotating shaft 2a is inserted into the shaft through hole 34, and the engaging protrusion 3 is inserted into the notch recesses 25a to 25c.
Combine 5a to 35c. In this state, the fitting piece 30 may be pushed into the accommodation recess 20. Then, the fitting piece 30 is rotated in either the left or right direction within the stopper 23 until one of the engaging protrusions 35a to 35c is fitted.

In FIG. 3, the engagement protrusion 3 with respect to the protrusion 22a is shown.
5a is shown.

In that case, in order to keep the fitting piece 30 upwardly displaced at all times, a coil spring 16 as shown is used as in the conventional example.

Now, an example of how to use the fitting piece 30 configured as described above will be explained.

When the optical disk 7 is mounted horizontally, the fitting piece 30 is attached so that the first fitting part 32 is exposed to the outside, as shown in FIG.

In this way, the fitting surface (the sliding surface relative to the center hole of the optical disk 7) from the accommodation recess 20 becomes shorter. The protrusion length is almost the same as the conventional example.

After installing the optical disk 7 as shown in Figure 1,
Since the optical disk 7 is fixed to the turntable 4 from above by the annular magnet 9, the fitting piece 30 is pressed slightly downward. As a result, the upper surface of the engaging protrusions 35a to 35c and the protrusion 2
It is in a non-contact state with the lower surfaces of 5a to 25c.

However, the mutual relationship is set so that the engaged state shown in FIG. 3 is not released even by this pressing.

When the optical disk 7 is mounted vertically, the fitting piece 30 is inverted so that the second fitting portion 33 is on the upper side.

As a result, the fitting surface of the fitting piece 30 becomes longer, so even when the optical disk 7 is mounted vertically, there is no risk of hindrance to the mounting.

In addition, although this invention was applied to the rotational drive system of a CD player in the above description, it can also be applied to other rotational drive devices. The sheet-like recording medium is not limited to an optical disk.

[Effects of the invention] As explained above, in this invention, a fitting piece in which a pair of fitting parts having fitting surfaces having different lengths is formed can be housed in the accommodation recess in a detachable manner. This is what I did.

According to this, it can be used for both horizontal mounting and vertical mounting by simply changing the mounting state of the fitting piece according to the purpose.

Therefore, the trouble of storage due to a separate configuration is eliminated, and it has practical benefits such as being able to be changed and used extremely easily.

Therefore, the rotary drive device according to this invention is extremely suitable for application to the above-mentioned CD player.

[Brief explanation of the drawing]

1 and 2 are configuration diagrams of essential parts showing an example of the rotary drive device according to this invention, FIG. 3 is a sectional view of the accommodation recess, FIG. 4 is a plan view thereof, and FIG. 5 is a fitting diagram. FIG. 6 is a sectional view of the frame, FIG. 6 is a plan view thereof, and FIGS. 7 and 8 are configuration diagrams of a conventional rotary drive device. 2a...rotating shaft, 4...turntable, 7...
...Optical disk, 10...Rotary drive device, 20...
Accommodation recess, 22a to 22c... projection, 23... stopper, 30... fitting piece, 31... main part, 3
2, 33... Fitting portion, 35a to 35c... Engagement protrusion.

Claims (1)

[Claims for Utility Model Registration] (1) A fitting piece that fits into the center hole of a sheet-like recording medium is removably housed in a piece-accommodating recess of a turntable connected to a rotating shaft, and this fitting A rotary drive device, characterized in that a pair of fitting portions having different lengths of fitting surfaces are formed in the frame, and the fitting portion is selected depending on the mounting state of the recording medium. (2) When the recording medium is mounted in a horizontal state, the mating piece is placed in the above position so that the recording medium is mated by the first mating portion having a short mating surface. 2. The rotational drive device according to claim (1), wherein the rotational drive device is configured to be installed in a housing recess. (3) When the recording medium is mounted vertically, the mating piece is housed in the housing so that the recording medium is mated by the second mating portion having a long mating surface. The rotational drive device according to claim (1) of the utility model registration, characterized in that it is mounted in a recess. (4) The rotary drive device according to claims (1) to (3) for utility model registration, characterized in that an optical disk is used as the recording medium.