JPH0216474Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field of the invention] This invention is a disc playback device such as a digital audio disc or a video disc, in which shocking vibrations applied from the outside are transmitted to a playback head for signal detection. The present invention relates to a buffer device for a disc playback device that prevents such problems.

[Prior art]

Conventional disc playback devices such as general compact disc players include an optical pick-up head, a tray on which the disc is placed and moves it in and out of the device, a turntable, a clamper that chucks the disc onto the turntable, and a drive that drives the turntable. A motor and the like are installed in the sub-chassis, and the entire sub-chassis assembly is either integrated with the exterior case or fixed to a separate main chassis with screws or the like.

By the way, in the disk playback device having the above structure, when an impact vibration is applied to the device from the outside, the vibration is transmitted to the optical pickup head through the path of the outer case → main chassis → sub chassis, which is a disadvantage. There is. Optical pickup heads are extremely susceptible to impulsive vibrations, and when such vibrations are applied, tracking errors occur and smooth playback cannot be performed.

[Purpose of invention]

This invention was made to eliminate the above-mentioned disadvantages, and provides a buffer device for a disc playback device that prevents vibrations applied from the outside from being transmitted to a playback head for signal detection. The purpose is to

[Structure of the idea]

The structure of this invention is that in a disc playback device that includes a sub-chassis disposed within an outer case and a playback head for signal detection on the sub-chassis, a recess is formed in the vibration transmission path between the outer case and the sub-chassis. The supporting part of the rubber bush is a boss having a tapered tip, and the concave part of the rubber bush and the boss are arranged so that a gap is formed around the tapered part of the boss. It is characterized by being fitted so that it is formed.

[Embodiment] FIGS. 1 to 7 are diagrams showing an embodiment of this invention.

In FIGS. 1 and 2, reference numeral 1 designates an outer case of the disk playback device, 2 a sub-chassis disposed within the outer case 1, and 3 a tray supported on the sub-chassis 2. The exterior case 1 is an integrally molded product made of synthetic resin, and serves as a main chassis for attaching a sub chassis 2, a printed circuit board 4, etc., and has a mounting wall 6 connected to the front wall 5 inside. , has a mounting wall part 8 and the like connected to the side wall part 7. The front wall portion 5 of this exterior case 1
A front panel 9 is attached to the front of the. The sub chassis 2 is a plate having a rectangular shape in plan view,
It is mounted on the mounting walls 6 and 8 with its front edge aligned with the opening 10 formed in the front wall 5 of the exterior case 1. Details of the mounting structure of this subchassis 2 will be described later. A drive motor 11 is fixed to this sub-chassis 2, and this drive motor 1
A turntable (not shown) is fixed to the rotation shaft 1. Furthermore, this sub-chassis 2 is equipped with an optical pick-up head 12 (reproducing head), a clamper 13, a tray drive mechanism 14, and the like. The tray 3 is placed in the direction indicated by the arrow A, with the disk 16 placed on the disk mounting portion 15 formed on its upper surface.
By moving in direction B, the disk 16 is transferred from the outside to the inside of the device and from the inside to the outside, and the figure shows the disk 16 placed on the disk mounting section 15 being positioned on the turntable. The apparatus is supported so as to be movable between the closed position shown in FIG. There is. This tray 3 is connected to the tray drive mechanism 1
4. When the disc 16 is placed on the turntable by the tray 3, the clamper 13
This disk 16 is checked on a turntable. Note that this clamper 13 is adapted to be driven in conjunction with the movement of the tray 3.

The attachment structure of the sub-chassis 2 will be described. The sub-chassis 2 is attached to the exterior case (main chassis) 1 at four locations, two on the left and right, via rubber bushings 20. Since the above-mentioned four mounting structures have the same structure, these structures will be explained using the structure shown in FIG. 3 (the structure shown by the arrow in FIG. 2) as an example. A holding member 22 made of synthetic resin is fixed to the portion where the hole 21 is formed by outsert molding. On the other hand, in this example, a boss 23 is formed on the upper surface of the mounting wall portion 8 of the exterior case 1 and projects upward. The tip 23a of the boss 23 is tapered upward, and is formed in a so-called tapered shape. The rubber bushing 20 is made of butyl rubber or the like, and as shown in FIGS.
4 is formed by forming a cylindrical sub-portion 25 having an outer diameter smaller than 4. A mounting hole 26 (recess) having a circular cross section is formed in the main part 24 along its axis, and an operation hole 27 is formed in the sub part 25 along its axis. Further, the upper end portion 25a of the sub-portion 25 is formed in a tapered shape. Then, the sub-chassis 2 tightly fits the sub-portion 25 of the rubber bushing 20 into the hole 22a of the holding member 22, and the rubber bushing 20
It is attached to the exterior case 1 by tightly fitting the attachment hole 26 and the boss 23. When installing the rubber bushing 20, its secondary part 25
The hole 22a is guided by the tapered tip 25a.
The main portion 24 is fitted into the tapered tip portion 23a.
It is fitted into the boss 23 using this as a guide. In addition, if the sub part 25 cannot fit smoothly into the hole 22a, the operating hole 2
This fitting is achieved by inserting an operating tool such as a pin into 7 and manipulating the orientation of the sub-portion 25 with the operating tool. In the structure in which the rubber bushing 20 is attached to the boss 23, there is a certain distance in the mounting hole 26 between the ceiling of the mounting hole 26, the upper end surface of the boss 23, the side surface of the mounting hole 26, and the tapered tip 23a of the boss 23. A void 28 is formed. Sub chassis 2
has the above-mentioned structure, and is attached to the mounting wall 8 of the exterior case 1 at two locations on the left end, and attached to the mounting wall 6 at two locations on the right end. Based on this configuration, the sub-chassis 2 can be displaced within a range in which the rubber bush 20 can be elastically deformed.

Furthermore, the movement range of the sub-chassis 2 at four locations, two on the left and right, is restricted by mounting screws 30 fixed to the exterior case 1. The structures of the above four locations are similar, so to explain these structures using the structure shown in FIGS. 6 and 7 (the structure in the direction of the arrow in FIG. 1) as an example, first, the sub chassis 2. A hole 31 is formed in the hole 31 . The portion of the exterior case 1 located below the hole 31, in this example the mounting wall portion 8, includes:
A strut 33 having a female screw hole 32 is formed inside thereof. In the female screw hole 32 of this support 33,
A mounting screw 30 is screwed through a hole 31 from the top side of the sub-chassis 2. The mounting screw 30 has a pillar part 34 and a head part 35 at its upper end. When the mounting screw 30 is installed as described above, the pillar part 34 is positioned so as to pass through the hole 31, and the head part 35 is positioned so that it passes through the hole 31. It is located above by a predetermined distance. In this configuration,
A gap is formed between the outer peripheral surface of the column 34 and the inner surface of the hole 31 of the sub-chassis 2, and the sub-chassis 2 can move within a certain range in the horizontal direction. Further, the head 35 is formed in a size such that the sub-chassis 2 engages with the sub-chassis 2 when the sub-chassis 2 moves upward, and restricts the upward movement of the sub-chassis 2 at a certain position.

In addition, in FIG. 2, the reference numeral 37 indicates the outer case 1.
This is the back plate that covers the bottom surface of the .

Based on the above configuration, this disk playback device pulls out the tray 3 from the opening 10 to the outside of the device, loads the disk 16 onto the disk mounting portion 15, moves the tray 3 inside the device, and then plays the disk. 16 is placed on the turntable, the disc 16 is chucked onto the turntable by the clamper 13, and the drive motor 11 is turned on to rotate the disc 16, thereby allowing the optical pickup head 12 to play the disc 16. conduct.

Furthermore, in this device, when an impactful vibration is applied from the outside, it is possible to prevent this vibration from being transmitted to the subchassis 2 equipped with the optical pickup 12 or the like. That is,
The vibration transmission path between the exterior case 1 and the sub-chassis 2 is constructed from the boss 23 of the exterior case 1 → the rubber bush 20 → the holding member 22 → the sub-chassis 2, and the rubber bush 20 is capable of deformation. Therefore, when an impact force is applied to the exterior case 1 and the exterior case vibrates, this vibration is absorbed by the rubber bushing 20 when it is about to be transmitted to the sub-chassis 2. rubber butt 2
0 is elastically deformed when the exterior case 1 vibrates, moves the exterior case 1 relative to the sub-chassis 2, and prevents the movement of the exterior case 1 from being transmitted to the sub-chassis 2. In this case, the tip 23a of the boss 23 is formed into a tapered shape, and a gap 28 is formed around the tip 23a in the mounting hole 26, so that the rubber bush 20
The vicinity of the upper part of the mounting hole 26 can be easily elastically deformed, thereby achieving a high vibration-proofing effect.
In addition, when the sub-chassis 2 moves excessively relative to the exterior case 1, the mounting screw 30 restricts the relative movement of the sub-chassis 2 at a certain position, and the fitting between the holding member 22 and the rubber bush 20 and the rubber bush 20 are prevented. This prevents the fitting between the boss 23 and the boss 23 from coming off.

Thus, in this device, the outer case 1
When the vibration occurs, the rubber bushing 20
The vibrations of the sub chassis 2 can be suppressed by absorbing the vibrations of the optical pickup head 1.
2. The vibration of the disk 16 can be suppressed, thereby preventing the occurrence of tracking errors due to vibration.

In this invention, the location where the shock absorbing device such as the rubber bushing is provided is not limited to the above-mentioned embodiments, but may be in the vibration transmission path between the exterior case and the sub-chassis.

[Effect of idea]

According to this invention, since a buffer member is interposed in the vibration transmission path between the subchassis equipped with the playback head and the outer case, even if the outer case vibrates, this vibration can be absorbed by the buffer member. Vibration of the reproducing head can be prevented, thereby preventing tracking errors from occurring due to vibration.

Further, the buffer member is a rubber bushing having a concave portion, the supporting portion of the rubber bushing is a boss having a tapered tip, and the concave portion of the rubber bushing and the boss are arranged to form a space around the tapered portion of the boss. Since the rubber bushing is fitted in such a way that the space is formed, the rubber bushing can be easily elastically deformed due to the above-mentioned gap, and a high vibration-proofing effect can be obtained. The apparent length of the boss can be increased, making it difficult for the boss and the rubber button to disengage from each other, and the tapered portion of the boss can be used as a guide when the boss and the rubber button are mated, making it easier to assemble them. Work can be done easily.

[Brief explanation of the drawing]

The drawing shows an example of this invention.
Figure 1 is a plan view of the main parts of the disc playback device;
The figures are a sectional view taken from the line shown in Fig. 1, Fig. 3 is an enlarged view of the part shown in the direction of the arrow in Fig. 2, Fig. 4 is a plan view of the rubber bushing, Fig. 5 is a front sectional view of the rubber bushing, and Fig. 6 is a cross-sectional view of the same as shown in Fig. 1. FIG. 7 is an enlarged sectional view taken along the line of FIG. 6. 1...Exterior case, 2...Sub chassis, 12
...Playback head (optical pick-up head), 2
0...Rubber butt, 23...Boss, 23a...
Tip of boss 23, 26... recess (mounting hole), 2
8...Void.

Claims (1)

[Scope of utility model registration request] In a disc playback device comprising a sub-chassis disposed within an outer case and a playback head for signal detection on the sub-chassis, a rubber bush having a recess is interposed in a vibration transmission path between the outer case and the sub-chassis. The supporting part of the rubber bushing is a boss having a tapered tip, and the concave part of the rubber bushing and the boss are fitted so that a gap is formed around the tapered part of the boss. A buffer device for a disc playback device, characterized in that the buffer device is made of a combination of: