JPS6029991A - Disk player - Google Patents

Abstract

PURPOSE:To protect the recording surface of a disk by providing a dust cover which can cover the part protruded from a disk housing on a turntable together with a drive mechanism for said cover. CONSTITUTION:A dust cover 8 is supported with free oscillation and concentrically to the rotary shaft of a turntable 3 and covers a part protruded from a housing 1 of a disk 2a through a bent part 8C and the main surface of the cover 8. A drive mechanism of the cover 8 contains a drive gear 10, a drive motor 11, etc. In a performance mode the drive mechanism oscillates the cover 8 counterclockwise centering on a plate shaft 6 and also with sliding on a cover holding plate 7 to cover the part protruded from the housing 1 with operation of a button. Then said button is pushed again after the performance is over, and the motor 11 is revolved counterclockwise. Thus the disk 8 and a disk clamper 17 are reset to their original positions, i.e., the non-performance positions respectively.

Description

[Detailed description of the invention] The present invention relates to a disc player.

So-called disc record or P with sound grooves on the surface
A disc player that plays a disc such as a digital audio disc on which a GM signal is recorded, in which the housing size is reduced by performing the performance with a part of the disc protruding from the housing, and when the disc is not being played. Players that occupy as little space as possible as a whole have been developed and are in use.

As mentioned above, in this type of disc play 17, since a part of the disc protrudes outside the housing during performance, dust tends to adhere to the recording surface of the disc, and the recording surface is easily damaged. was there.

The present invention has been made in view of the above-mentioned points, and its object is to provide a small-sized disk player that can protect the disk recording surface from dust adhesion and damage.

The disc player according to the present invention is supported concentrically with the rotation axis of the turntable and swingably between a playing position and a non-playing position, and can cover the portion of the largest diameter disc on the turntable that protrudes from the housing. It is characterized by having a dustproof cover and a drive mechanism that drives the dustproof cover.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A disc player according to an embodiment of the present invention will be described below with reference to FIGS. 1 to 6.

As is clear from FIG. 1 of the accompanying drawings, a disc 2 to be played is mounted on the front panel portion 1a of the housing 1.
The approximately rectangular disk insertion slot 1b for inserting the disc into the housing is arranged in the left-right direction (in the direction of arrow X and the opposite direction).
(However, left and right here refers to the front direction indicated by arrow Y). The dimension of the housing 1 in the front-rear direction, that is, the depth dimension, is smaller than the outer diameter of the largest diameter disc to be played. Inside the housing 1 is a turntable 3.
is provided, and is pivotally supported, for example, on the bottom 1C of the housing 1 via a predetermined support shaft (not shown). The turntable 3 is rotationally driven by a driving means (not shown). Also, inside the housing 1 there is a tone arm (
(not shown), and the tone arm and the turntable 3 constitute a part of the disc playing means. Inside the housing 1, a dustproof cover mounting angle 5 having a square cross section is arranged along the earth wall and both side walls of the housing, and is attached to the bottom 1C of the housing at both ends with a plurality of screws 5a. The part is fixed. A plate shaft 6 is arranged on the lower surface of the dustproof cover mounting angle 5 so that its axis substantially coincides with the rotation axis of the turntable 3, and a protrusion 6a protruding from the upper end of the plate shaft 6 is attached to the dustproof cover mounting angle 5. It is caulked and fixed.

Another protrusion 6b is formed at the lower end of the play 1 to the shaft 6, and the dustproof cover receiving plate 7 is fitted into the protrusion 6b at the center of its main surface, and is screwed onto the outer periphery of the protrusion 6b. It is fixed to the plate shaft 6 by a nut 8 which is screwed into a carved male thread. On the dustproof cover receiving plate 7, a dustproof cover 8 having a substantially sector-shaped main surface is supported on a protrusion 8a provided on the main surface. Further, an opening 8b is formed in the upper wall of the protrusion 8a, and the dustproof cover 8 is slidably engaged with the outer periphery of the plate shaft 6 in the opening. That is, the dustproof cover 8 is supported so as to be swingable concentrically with the rotation axis of the turntable 3. A bent portion 8C bent approximately at right angles to the main surface of the dustproof cover is provided at the peripheral edge of the dustproof cover 8 and corresponds to the fan-shaped arc. The portion of the largest diameter disk placed on the turntable 3 that protrudes from the housing 1 is covered by the cover. Here, the stop position of the dustproof cover 8 in the housing 1 (for example, the position shown in FIG. 2) is referred to as the non-performance position of the dustproof cover, and the position where the dustproof cover covers the disc protruding from the housing 1 is referred to as the non-performance position of the dustproof cover. This is called the playing position.

A gear 8 is provided on the outer periphery of the protrusion 8a provided on the dustproof cover 8.
d is formed, and this gear is disposed adjacent to the protrusion 8a and meshes with the dustproof force 1 (- drive gear 10) which is pivotally supported on the dustproof cover mounting angle 5 via the gear shaft 10a. A pulley portion 10 is provided on the upper part of the dustproof cover drive gear 10.
b is integrally formed. Further, a drive motor 11 is disposed at the rear left of the dustproof cover 8, and a small pulley 11b and a boob portion 10b are fitted to the output shaft of the drive motor.
A belt 110 is stretched between the two.

The dustproof cover driving gear 10, the drive motor 11, and the like constitute a drive mechanism that drives the dustproof cover 8.

Near the periphery of the dustproof cover receiving plate 7, which is accommodated in the recess 8d formed by the protrusion 8a provided on the dustproof cover 8, there are a pair of symmetrical holes symmetrically about the center of the main surface of the dustproof cover receiving plate. clamper drive gear screw 1
2 is fixed at its upper end. A clamper drive gear 13 is screwed into each clamper drive gear screw 12 . As is particularly clear in FIG. 3, each clamper drive gear 1
A circumferential groove 138 is provided approximately in the axial center of the clamper drive gear 13, and the clamper drive gear is divided into two upper and lower gear portions 13b and 13C by the circumferential groove 13a. These gear parts 13b and 13G mesh with a gear 8e formed on the inner peripheral surface of the protruding part 8a. A clamper plate 14 is installed between both clamper drive gears 13. 3, the clamper plate 14 has a circumferential groove 138 in each clamper drive gear
A pair of substantially semicircular notches 14a are formed corresponding to the circumferential groove 138 of the clamper plate 14.
The clamper drive gear 13 is supported by both clamper drive gears 13 by being slidably engaged with the clamper drive gears 13.

A clamper plate shaft 16 is fixed to the clamper plate 14 so that its axial center substantially coincides with the rotation axis of the turntable 3. Further, a disc clamper 17 is disposed below the clamper plate 14, and the disc clamper has a clamper retaining ring 18 fitted near the lower end of the clamper plate shaft 16, and a claw portion protruding from the upper surface of the clamper retaining ring 18. 17a. Disc clamper 1
7 is pivotally supported to the housing 1 as a whole. The lower surface of the disc clamper 17 engages with each center hole of an LP size disc and an EP size disc, respectively, and moves the center of both discs onto the turntable 3.
Engagement protrusions 17b and 17c are provided in a protruding manner for positioning at the top.

The engagement protrusion 17b, which can engage with the center hole of an LP size disk, has a spherical lower end, so that engagement with the center hole of the disk is smooth.

Further, the engaging protrusion 17c is annular, and a tapered portion is formed on the outer periphery of the distal end of the engaging protrusion 17c in order to smoothly engage the disc center hole. Incidentally, the turntable 3 is formed with recesses 3a and 3b corresponding to the engagement protrusions 17b and 170, into which the re-engaging protrusions can be fitted. Also,
A rubber sheet 3c is attached to the top surface of the turntable 3.

For example, as shown in FIG. 1, the engaging protrusion 17b is hollow, and a coil spring 20 is fitted into the hollow portion. A clamper plate shaft seat 21 is fixed to one end of the coil spring 20 and is rotatably engaged with the tip of the clamper plate shaft 16. The tip of the clamper plate shaft 16 is spherical, and the rotation of the clamper plate shaft seat 21 relative to the clamper plate shaft 16 is extremely smooth. The coil spring 20 is compressed in the hollow portion of the engagement protrusion 17b, and the disk clamper 17 is given a downward bias (in the opposite direction of arrow Z) by the coil spring. Therefore, the pair of claws 17a protruding from the upper surface of the disc clamper 17 are always engaged with the clamper retaining ring 18 when the disc is not being played. Furthermore, during performance, the engagement between the claw portion 17a and the clamper retaining ring is released.

Above dustproof cover receiving plate 7, clamper drive gear screw 1
2. The clamper drive gear 13, the disc clamper 14, the clamper plate shaft 16, etc. constitute an interlocking mechanism that interlocks the disc clamper 17 with the operation of the dustproof cover 8, and the disc clamper 8 moves to the dustproof cover via the interlocking mechanism. 8, the disc 2 is clamped as the dust cover 8 moves from the non-performance position to the performance position.

As shown in FIGS. 4 and 5, a portion of the bottom 1C of the housing 1 engages with the outer periphery of, for example, an LP size disc 2a inserted from the disc insertion slot 1b, and moves the LP resizing disc onto the turntable 3. Very close to the predetermined performance position, specifically, as shown in FIG. A pair of left and right guide bins 23 are protruded to guide the vehicle.

Further, a pair of left and right brackets 24 are fixed on the bottom portion 1C in front of the guide bin 23. A shaft 25 is fixed to the upper ends of both brackets 24 and extends left and right, and a guide member 26 having a linear cross section perpendicular to the direction of extension is swingably supported on the shaft. . A pair of left and right guide bins 26a protrude from one swinging end of the guide member 26 to guide the EP size disc very close to the predetermined performance position by engaging with the outer periphery of the EP resizing disc 2b. has been done. Further, a coil spring 28 whose reaction force is received at the bottom 1C, for example, is connected to the other swinging end of the guide member 26, and the guide member 26 is moved in the direction of the arrow (in the fifth direction) by the coil spring.
(see figure) has been given a Paiska rating. The guide member 26 is also connected via a slider 3o and a so-called bush lock switch 31 to a push button 29 disposed on the lower right side of the front panel portion 1a. Each time the push button 29 is pressed once, the bush lock switch 31 is actuated, the guide member 26 swings, and the guide bin 26a protruding from the guide member 26 is moved into the EP9 size disc 2.
It reciprocates between a position where it can engage with b and a position where it cannot.

The above-described guide bin 23, guide member 26, and peripheral members related thereto constitute a disk guiding means.

Next, the operation procedure for playing a disc using the disc player configured as described above will be explained with reference to FIGS. 7 to 11.

1 to 3 show the state of the disc player before a disc is inserted. In this state, first, the push button 29 is pressed to swing the guide member 26 in the opposite direction of the arrow against the bias caused by the coil spring 28 (see FIGS. 5 and 9). Next, an LP resize disc 2a having a diameter of, for example, 3Qcm to be played is inserted into the disc insertion slot 1b formed in the front panel portion 1a. As mentioned above, since the guide member 26 is swung in the opposite direction, the LP resizing disk 2
a can be inserted into the guide pin 26a of the guide member 26 without engaging it.

For example, as shown in FIG. 5, [P size disk 2a
When the disc is pushed into the housing 1 by a predetermined amount, the outer periphery of the disc engages with the guide bin 23, and the disc is moved so that the center of the recording surface of the disc is e from the rotation axis of the turntable 3.
is placed on the turntable after being guided to a position shifted rearward by a certain amount (see also FIG. 6).

Here, if the disk has an outer diameter of 17cIIl, that is, it is an EP size disk 2b, there is no need to press the push button 29 before inserting the disk into the housing 1, and the EP size disk is attached to the guide member 26. The guide bin 26a guides the player near a predetermined performance position on the turntable 3 (see FIG. 6). It goes without saying that by providing another disc guide means at a predetermined position between the guide bin 23 and the guide member 26, it becomes possible to play a disc with an outer diameter of 25 cm, for example.

When the positioning of the disk 2 on the turntable 3 is completed, a button for operating the dustproof cover 8 is pressed, for example, among the other operation buttons (not shown) arranged on the front panel 1a. Then, the drive motor 11 and the dustproof cover drive gear 1° start rotating clockwise and counterclockwise, respectively, in FIG. Therefore, the dustproof cover 8 is centered around the plate shaft 6 and the dustproof cover receiving plate 7
While sliding on the top, swing counterclockwise in FIG. 2 to learn the part of the LP resizer 2a that protrudes outside the housing 1 as shown in FIG. 7 (al and mountain). As shown in FIG. 8, the two clamper drive gears 13 are rotated as the dustproof cover 8 protrudes out of the housing, and both clamper drive gears move downward along the clamper drive gear screw 12. do. Therefore, the disk clamper 17 supported by the clamper drive gear 13 via the clamper plate 14 also moves downward, and the engagement protrusion 17b of the disk clamper tfiLP size disk 2
Engage with the center hole of a. When the engaging protrusion 17b engages with the center hole of the disk, the disk 2a is pressed forward by the spherical surface because the tip of the engaging portion 17b is spherical. Therefore, the center of the recording surface of the disk 2, which had previously been shifted backward by e with respect to the rotation axis of the turntable 3, is now aligned with the rotation axis of the turntable, as shown in FIG. 10 (J and crest). Disc 2 is clamped. At the same time, the state in which the outer periphery of the disc 2 is held together with the guide bin 23 is released, and the disc 2 enters a playable state.

FIG. 11 shows the operation when the disk 2 is of EP size.
By engaging with the center hole of the P size disc, the center of the disc recording surface is aligned with the rotating shaft of the turntable 3.

After the disc 2 is clamped by the disc clamper 17, the rotation of the turntable 3 and the tone arm (
A lead-in and down motion (not shown) is performed, and the performance begins.

After the performance is finished, the drive motor 1 is activated by pressing the button (described above) again to operate the dustproof cover 8.
1 rotates counterclockwise in Fig. 2, and the dustproof cover 8
And the disc clamper 17 is in the position before operation, that is,
Returns to non-playing position. It should be noted that the fact that the dustproof cover 8 has reached the non-performance position or the performance position is detected by a detection switch or optical sensor (not shown), and the drive motor 11 is stopped by a detection signal emitted from these. Ru.

After the clamping state by the disc clamper 17 is released, the disc 2a is recovered.

In this embodiment, a single dustproof cover 8 is shown, but the present invention is not limited to this.
For example, it is also possible to use two-part dustproof covers 338 and 33b as shown in FIG. 12 (ω).
As shown in FIGS.) and (C), each of the pair of dust-proof covers 338 and 33b on the left and right sides of the housing 1 protrudes outside to cover a portion of the disk protruding from the housing 1. By covering with such a two-split format, effects such as shortening the time required to cover the disk exposed outside the housing 1 are brought about.

Further, in this embodiment, the disc clamper 17 is
Although it is shown as having two types of engaging protrusions 17b and 17C that can match the center holes of both LP and EP size disks, as shown in FIG. It is also possible to provide the disc clamper 34 having only the engaging protrusion 34a that can engage with the center hole of the size disc. In this case, as shown in FIG. 13, a spindle portion 3 is also provided on the turntable 3 that can fit into the center hole of the LP size disc 2a.
A is made to protrude and a recess 34b is formed in the disk clamper 34 into which the spindle portion can be inserted.

As described in detail above, the disc player according to the present invention is provided with a dustproof cover capable of covering the portion of the largest diameter disc on the turntable protruding from the housing, and a drive mechanism for driving the dustproof cover. Therefore, dust is prevented from adhering to the recording surface of the disk, and the recording surface is completely prevented from being damaged.

[Brief explanation of the drawing]

Fig. 1 is a front view including a partial cross section of a disc player 17 according to the present invention, Fig. 2 is a plan view of the disc player, Fig. 3 is a perspective view of main parts of the disc player, and Figs. The figures are a plan sectional view and a perspective view including a partial cross section of the disc player, Fig. 6 is a diagram showing the state of guiding the disc to the vicinity of the playing position, Fig. 7 (ω, mountain), Fig. 8, and Fig. 9. Figure, 1st
Fig. 0 (ω, (b)) and Fig. 11 are diagrams showing the operation of the internal mechanism of the disc player, Fig. 12 is a diagram showing a modification of the dustproof cover, and Fig. 13 is a modification of the disc clamper and turntable. Explanation of symbols of main parts 1...Housing 2...Disc 3...Turntable 7...Dust-proof cover receiving plate 8. ... Dustproof cover 10 ... Dustproof cover drive gear 11 ... Drive motor 11C ... Belt 12 ... Clamper drive gear screw 13 ...・・・
- Clamper drive gear 14... Clamper plate 16... Clamper plate shaft 17... Disc clamper 20... Coil spring 21... Clamper plate Shaft seat 23.26
Guide bin 26 for 8... Guide member applicant Pioneer Co., Ltd. Figure 6 also Figure 7 (a) Ia. (bJ Breasts! 2 Closed j3b #13 Diagram A

Claims (1)

[Claims] A disc player having a configuration in which a disc playing means including a turntable and a disc guiding means are provided in a housing whose depth dimension is smaller than the outer diameter of the maximum diameter disc to be played, the disc player having a housing that is concentric with the rotation axis of the turntable. and a dustproof cover that is swingably supported between a performance position and a non-performance position and can cover a portion of the largest diameter disc on the turntable protruding from the housing, and a drive mechanism that drives the dustproof cover. A disc player comprising: