JPH035037Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to an optical disk player with improved vibration resistance suitable for use in automobiles, aircraft, etc.

[Conventional technology]

Traditionally, in-vehicle cassette tape players that use magnetic tape suffer performance deterioration due to wow and flutter caused by vibrations inside the car, but the above deterioration is not fatal, so the mechanism , almost no anti-vibration measures were taken.

[Problem that the invention attempts to solve]

However, due to its mechanism, optical disc players suffer from a significant deterioration in performance against vibrations, and even more so when it comes to vehicle-mounted optical disc players, anti-vibration measures are indispensable.

However, in a vehicle-mounted optical disk player, the mechanism that isolates the mechanical deck from the frame via anti-vibration rubber has a vibration system that has a Q value (Quality) in the resonance region of the system.
Factor) takes a fairly large value. Moreover, in the case of a car, for example, the frequency band generated by various adverse conditions during driving usually includes the above-mentioned resonance range. Therefore, if an on-vehicle optical disc player is vibration-proofed only using anti-vibration rubber, sound skipping will occur and the on-vehicle optical disc player will not be able to maintain normal operation.

Therefore, as an anti-vibration mechanism for an on-vehicle optical disc player, instead of using anti-vibration rubber, for example, a mechanical deck can be suspended from a frame such as a chassis or a cabinet using suspension coil springs provided at a plurality of locations. A damper that absorbs vibrations is interposed between the frame and the mechanical deck, and the mechanical deck is supported in a floating state with respect to the frame. A vibration isolation mechanism that reduces the resonance number f ₀ in the direction) can be considered. However, in such a vibration isolation mechanism, the performance of the damper becomes an important issue. In other words,
As long as the performance of the damper is good, this type of vibration isolation mechanism has lower vibration isolation characteristics than a vibration isolation mechanism using vibration isolating rubber.
The rise of the Q value in the resonance region is significantly reduced, so that skipping of the sound does not occur, and therefore the vibration damping properties are significantly improved.

[Means to solve the problem]

In order to solve the above-mentioned problem, the present invention is designed to attach a mechanical deck equipped with an optical pickup, a turntable, etc. to a frame using elastic support biasing means of suspension coil springs and compression coil springs provided at multiple locations. In addition to elastically supporting the
A damper for absorbing vibrations of the mechanical deck is interposed between the frame and the mechanical deck,
As a result, in the optical disk player configured to support the mechanical deck in a floating state with respect to the frame, the damper is attached to the container portion made of an elastic material and the accommodation space formed within the container portion. It is composed of an enclosed viscous fluid and an electrophoresis rod connected to the container, and the container is attached to one of the frame and the mechanical deck, and the electrophoresis rod is attached to the other. The container part includes a cylindrical migration part projecting into the accommodation space, a thick ring-shaped stopper part formed at intervals around the outer periphery of the migration part, and a ring-shaped stopper part formed between the stopper part and the above-mentioned migration part. and a thin ring-shaped connecting part interposed between the electrophoresis part and the electrophoresis part, and the ring-shaped stopper part is attached to a first abutting surface provided on the other of the frame and the mechanical deck. A ring-shaped groove is formed between the stopper part and the connecting part, facing the first contact surface, and a ring-shaped groove is formed in the cylindrical migration part. It is characterized in that the above-mentioned migration rod is fitted.

〔Example〕

An embodiment in which the present invention is applied to a vehicle-mounted optical disc player will be described below with reference to the drawings.

1 to 11 show an embodiment of the present invention, and first, the state in which the mechanical deck is attached to the chassis will be explained based on FIGS. 1 to 3.

The mechanical deck 2 includes an optical pickup 6 that moves along a groove (not shown) formed in the mechanical deck 2, and a turntable 3a on which an optical disk (not shown) as a recording medium is placed. and a spindle motor 3 that rotationally drives a disk (not shown) by this turntable 3a.
etc. are provided. Then, the disk carried in from the direction of arrow A is chucked onto the turntable 3a of the spindle motor 3 by the disk chuck 4 rotatably attached to the tip of the chucking arm 5 which can be raised and lowered. In particular, disk loading is becoming more and more common. On the other hand, the chassis 1, which is housed in a cabinet 30 (not shown) and attached to a player attachment point (not shown) of a car, has a pair of side plates 7, 7 and connects these side plates 7, 7 to each other. It is formed from a connecting portion 8. A mechanical deck 2 is suspended from the chassis 1 by four suspension coil springs 10, and a mechanical deck 2 is provided between the side plates 7, 7 of the chassis 1 and the mechanical deck 2 to absorb vibrations of the mechanical deck 2. Four dampers 11 are interposed adjacent to the suspension coil springs 10, thereby supporting the mechanical deck 2 with respect to the chassis 1 in a floating state.

Between the connecting part 8 of the chassis 1 and the upper plate part 9 of the mechanical deck 2, there is a mounting for correcting the equilibrium position of the mechanical deck 2 with respect to the chassis 1 when the chassis 1 is installed at a certain angle with respect to the horizontal. A condition correction mechanism 12 is provided. Note that this attachment state correction mechanism 12 will be described later based on FIGS. 7 and 8.

A cabinet 30 shown in FIG. 4 is housed in a chassis 1 to which a mechanical deck 2 and the like are attached as shown in FIG. And the screw 3 that fixes the lid 31 to the top surface of the cabinet 30.
By rotating the lid 31 using the opening 3 as a fulcrum, the opening 3 provided in the upper surface of the cabinet 30 is opened.
3 can be opened and closed. Therefore, a screwdriver (not shown) is inserted through this opening 33, and the installation state correction mechanism 12 shown in FIG.
The eccentric cam 18 can be rotated.

Next, the structure and operation of the damper 11 are shown in Figures 5 to 6.
This will be explained based on Figure D.

The damper 11 is composed of a container part 11a attached to the side plates 7, 7 of the chassis 1, and a rod 11b fixed to the mechanical deck 2 and having a circular cross section.

The container portion 11a is made of an elastic material such as rubber, and has a housing space 40 formed therein for sealing a viscous fluid. And this accommodation space 40
A cylindrical migration section 41 protruding into the housing space 40 is provided approximately at the center of the housing space 40 . This electrophoresis section 41 has a shape in which protrusions 42 for increasing viscous resistance are formed on each surface of the outer periphery of a rectangular cylindrical body, and the electrophoresis rod 11b is press-fitted into the center thereof. An engagement hole 43 having a circular cross section is provided. Since the housing space 40 has four surfaces facing each surface of the square cylindrical body of the migration section 41, it has a substantially square cross section as shown in FIG. 6B. The rod 11b may be composed of, for example, a rigid rod body and a rubber cylindrical body fitted into the rod body.

The container portion 11a has a lid portion 48 on its outer side and a flange-shaped thick ring-shaped stopper portion 44 on its inner side. And the electrophoresis section 4
1 and the ring-shaped stopper part 44, a thin film-like connecting part 49 is provided which protrudes further outward than the stopper part 44 in a donut shape. A ring-shaped groove 50 is formed between the stopper part 44 and the connecting part 49 and has a substantially triangular cross section that becomes gradually narrower as it goes in the depth direction from the opening end. Further, a groove 46 is provided around the outer periphery of the ring-shaped stopper portion 44, into which the outer peripheral edge of a locking hole 45 provided in the side plate portions 7, 7 of the chassis 1 is locked. This groove 46 has a pair of engagement protrusions 47 that engage with an engagement recess (not shown) formed on the outer peripheral edge of the locking hole 45 to determine the mounting angle of the container portion 11a. It is provided.

In this embodiment, the container part 1 is made of butyl rubber.
After filling silicone oil (12,000 cS) into the storage space 40 previously formed on the side of the container body 1a, the viscous fluid is sealed by adhering a lid 48 made of butyl rubber. Moreover, the groove 4 of the stopper part 44 of the container part 11a
The container portion 11a is attached to the side plate portions 7, 7 of the chassis 1 such that the engaging protrusions 47 provided on the chassis 1 are located on the same horizontal line.

Therefore, when the chassis 1 vibrates in the vertical direction relative to the mechanical deck 2 and moves, for example, downward, the container portion 11a also moves downward, which is a direction perpendicular to its axis, as shown in FIG. 6C. At this time,
The rod 11b of the mechanical deck 2 is also made to be lowered together with the container part 11a. However, since the connecting part 49 is formed into a thin film and can be easily elastically deformed, the migration part 41 of the container part 11a, and thus the rod 11b, can easily move in the three-dimensional direction relative to the accommodation space 40. I'm starting to be able to do it. For this reason, the rod 11b hardly moves, and only the container portion 11a deforms as shown in FIG. 6C, and only its outer portions such as the ring-shaped stopper portion 44 move downward. For this reason, the container part 11
The silicone oil in a moves from the bottom to the top of the migration section 41, and viscous resistance is generated between the two. Due to energy dissipation due to this viscous resistance, vibrations of the chassis 1 relative to the mechanical deck 2 are rapidly attenuated, and propagation of vibrations to the mechanical deck 2 is sufficiently blocked.

Also, when the chassis 1 vibrates in the front-rear direction (left-right direction in FIG. 3) with respect to the mechanical deck 2,
The container portion 11a is also deformed in the same manner as shown in FIG. 6C, and the propagation of the vibration of the chassis 1 to the mechanical deck 2 is sufficiently blocked as in the case of the vibration in the vertical direction.

Also, chassis 1 is second to mechanical deck 2.
When vibrating in the left-right direction in the figure, the container portion 11a
For example, the robot moves in a direction approaching the mechanical deck 2 as shown in FIG. 6D. However, in this case as well, the container portion 11a is deformed as shown in FIG. 6D.
The propagation of vibrations of the chassis 1 to the mechanical deck 2 is sufficiently blocked. This also applies when the container portion 11a moves in the direction away from the mechanical deck 2.

Furthermore, the ring-shaped stopper portion 4 of the container portion 11a
4 and the lid part 48 have the function of a stopper and shock absorption when the container part 11a, which vibrates with the vibration of the chassis 1, vibrates in the axial direction of the damper 11 with respect to the mechanical deck 2 beyond the permissible limit. are doing. That is, when the stopper part 44 of the container part 11a further approaches the mechanical deck 2 from the state shown in FIG. Since the contact surface 38 is in elastic contact with the lid part 48 and the flat end surface of the migration part 41 is in elastic contact with the lid part 48, the impact is absorbed and the chassis 1 is prevented from moving further relative to the mechanical deck 2. approach is prevented. In this case, the stopper portion 44
Since the ring-shaped groove 50 exists between the stopper portion 44 and the thin film-like connecting portion 49, the contact surface 39
It is located far enough away. Therefore, both contact surfaces 3
Even if 8 and 39 repeatedly collide relatively strongly, there is no fear that the joint will be damaged and the silicone oil will flow out. Further, the protrusion 42 of the migration section 41 has a stopper and a shock absorbing mechanism when the chassis 1 vibrates in the vertical direction or the longitudinal direction with respect to the mechanical deck 2. That is, as shown by the chain line in FIG. 6B, the vibration causes the electrophoresis section 41 to
When the rod 11b approaches the upper surface of the housing space 40, the upper protrusion 42 comes into elastic contact with the upper surface, thereby absorbing the impact and preventing further relative displacement of the rod 11b with respect to the container portion 11a. blocked.

Further, the ring-shaped stopper portion 44 of the container portion 11a
By engaging the pair of protrusions 47 provided in the grooves 46 with the engagement recesses formed in the locking holes 45 of the side plates 7, 7 of the chassis 1, the container part 11a
is attached so that the cross section of the housing space 40 is approximately square, and two opposing sides thereof are approximately horizontal. Therefore, the chassis 1 is positioned with respect to the mechanical deck 2 in the vertical or horizontal direction in FIG. 6B.
It has a wide range of movement in the diagonal direction. Therefore, when an automobile equipped with an optical disc player vibrates to approximately the same extent simultaneously in the vertical direction and the longitudinal direction, the chassis 1 simultaneously moves by a distance l, for example, in the vertical direction and the horizontal direction in FIG. 6B with respect to the mechanical deck 2. try to. In this case, the chassis 1 tries to move about 1.4 degrees in a direction inclined at 45 degrees in FIG. 6B with respect to the mechanical deck 2, but the housing space 4
0 has a substantially square cross section as described above, so this amount of movement can be absorbed within the accommodation space 40.

As mentioned above, the damper 11 differs from the conventional general damper in which the container consists of two storage spaces,
The container portion 11a consists of a single accommodation space 40, and utilizes energy dissipation caused by the movement of the migration section 41 relative to the viscous fluid through this single accommodation space 40. Furthermore, since the migration section 41 has an uneven shape by forming protrusions 42 on each surface of the outer periphery of the rectangular cylinder, the migration section 41 is effective against viscous resistance considering its size. The surface area increases and therefore the energy dissipation associated with its movement also increases. Furthermore, since silicone oil is used as the viscous fluid, the vibration absorption performance of the damper is less likely to deteriorate due to temperature. Further, since the container portion 11a is made of butyl rubber, if the chassis 1 vibrates with respect to the mechanical deck 2, the container portion 11a
The butyl rubber undergoes repeated deformation, and the vibration energy is dissipated within the butyl rubber. Therefore, the container part 11
Although the damper a and the damper 11 are small, they have a large vibration absorbing force.

As shown in FIGS. 7 to 9, the attachment state correction mechanism 12 is provided with a square-shaped frame 13 and a connecting portion 8 of the chassis 1 that faces each other in order to slide the square-shaped frame 13. 2 pairs of guide hooks 14
, an eccentric cam 18 for sliding the square-shaped frame 13 along the guide hook, a locking hole 16 provided in the square-shaped frame 13, and a locking hole 16 provided in the upper plate portion 9 of the mechanical deck 2. and a correction coil spring 17 stretched between the locking hole 15 and the locking hole 15. This correction coil spring 17 is provided with a predetermined size on the mechanical deck 2 in order to correct the positional deviation of the mechanical deck 2 from the neutral equilibrium position with respect to the chassis 1 when the chassis 1 is installed at a certain angle with respect to the horizontal. The vibration system (normally the frequency f ₀ in the lateral direction (horizontal direction) is small) formed by the chassis 1, the mechanical deck 2, the suspension coil spring 10, and the damper 11. It has a low spring constant so that it has almost no impact.

The attachment state correction mechanism 12 is provided between the chassis 1 and the mechanical deck 2 so that its symmetrical centerline substantially coincides with a vertical plane containing the center of gravity G of the mechanical deck 2. Therefore, the correction coil spring 1
The direction of the applied force applied to the mechanical deck 2 by the mechanical deck 2 is always located on the vertical plane, and the displacement of the mechanical deck 2 from the neutral equilibrium position with respect to the chassis 1 is approximately parallel to this vertical plane. In addition, in this embodiment, the correction coil spring 17
is disposed at an angle of about 10° with respect to the bottom surface of the mechanical deck 2, which is the reference surface of the mechanical deck 2, when the mechanical deck 2 is in a neutral equilibrium state.

The head of the eccentric cam 18 is provided with a cut groove 19 for engaging a screwdriver, the bottom surface thereof is provided with a screw hole 20, and the bottom surface is provided with a locking protrusion 21 near the outer edge. It is being
Furthermore, as is clear from FIG. 9, the eccentric cam 18 is fixed by the screw 24 into which the washer 23 and the biasing spring 22 are inserted, so the eccentric cam 18 is connected by the biasing spring 22. Therefore, the locking protrusion 21 of the eccentric cam 18 is pressed into the groove 2 provided around the screw hole 25.
6. Therefore, the eccentric cam 18 is held at a predetermined rotation angle corresponding to the position of the protrusion 21.

Next, the function of the installation state correction mechanism 12 when the chassis 1 is installed horizontally or at a certain angle to the horizontal at the player installation location of the car will be explained based on FIGS. 3, 10, and 11. .

When the chassis 1 is installed horizontally at the player attachment point of the car, the mechanical deck 2 is held by the suspension coil spring 10 and the correction coil spring 17, and the damper 11 is at the neutral equilibrium position, as shown in FIG. Therefore, no force from the mechanical deck 2 is applied to the damper 11.

On the other hand, the chassis 1 is attached to the player attachment point of the car at a certain angle with respect to the horizontal, and the correction coil spring 1 of the attachment state correction mechanism 12
If the adjustment operation 7 is not performed, the direction of the gravity of the mechanical deck 2 with respect to the bottom surface of the mechanical deck 2, which is the reference plane, will change as shown in FIG. As a result, the damper 11 is deformed as shown in FIG. 10, so that the mechanical deck 2 is displaced from its neutral equilibrium position with respect to the chassis 1.

Therefore, as shown in FIG. 7, if the eccentric cam 18 in the installation state correction mechanism 12 is rotated by a screwdriver (not shown) or the like, the eccentric cam 18 and the square frame 13 will be adjusted as shown in FIG. Move from the position shown by the solid line to the position shown by the chain line. Therefore, the urging force of the correction coil spring 17 increases, and the mechanical deck 2 moves from the position shown by the solid line in FIG. 7 to the position shown by the chain line. Therefore,
By appropriately adjusting the rotation angle of the eccentric cam 18 of the installation state correction mechanism 12, the mechanical deck 2, which has been displaced as shown in FIG. 10, can be returned to the neutral equilibrium position shown in FIG. 11 with respect to the chassis 1. be able to.

12 and 13 show another embodiment of the attachment state correction mechanism 12 in FIG. 1. In this embodiment, the attachment state correction mechanism 12 has one end of a correction coil spring 17 locked in a plurality of correction locking holes 34 arranged in a row in the connecting portion 8 of the chassis 1. By selectively locking one end of the correction coil spring 17 in any one of the plurality of correction locking holes 34, the correction coil spring 17 can be used for correction in the same manner as shown in FIGS. coil spring 1
The magnitude of the biasing force 7 can be changed.

As is clear from a comparison between FIG. 12 and FIG. 7, the installation state correction mechanism 12 shown in FIGS. 12 and 13 has a simpler structure than that shown in FIGS. 1 to 11. Moreover, it has the advantage of having a large correction width for the mounting position of the correction coil spring 17, and is therefore suitable for mounting an on-vehicle optical disc player at a large mounting angle at the player mounting location in a car.

Although the embodiments of the present invention have been described above, various changes and modifications can be made to the present invention without departing from the technical idea of the present invention. For example, in the embodiment shown in FIGS. 12 and 13, when the chassis 1 is attached to the player attachment point of a car at a certain angle with respect to the horizontal, a plurality of (three) The mechanical deck 2 is held at a neutral equilibrium position with respect to the chassis 1 when one end of the correction coil spring 17 is locked in the locking hole 34 located approximately in the middle of the locking holes 34 (above). Alternatively, the correction coil spring 17 may be configured to apply an appropriate biasing force. In this case, when the chassis 1 is installed at the player mounting point of the car at an angle opposite to the horizontal direction as shown in FIG. The position shifts in the direction. Therefore, the correction coil spring 17
Contrary to the case shown in FIG. 12, one end may be locked in the locking hole 34 closer to the upper plate portion 9 of the mechanical deck 2. In this way, the biasing force of the correction coil spring 17 becomes smaller, so that the mechanical deck 2 moves relative to the chassis 1 from the position shown by the solid line in FIG. 12 in the direction opposite to the position shown by the chain line. Therefore, the positional deviation of the mechanical deck 2 relative to the chassis 1 from the neutral equilibrium position in the opposite direction to that shown in FIG. 10 can also be corrected. Also, chassis 1 is the
It is clear that if the device is installed at an angle in the same direction as in the case shown in Figure 0, the operation in the case described above should be completely reversed. In other words, even with the same installation state correction mechanism 12, it is possible to cope with the case where the chassis 1 is installed at the player installation location of the car with two angles, forward and backward, with respect to the horizontal.

[Effect of idea]

As described above, the present invention frames a mechanical deck by means of an elastic support biasing means and a damper having a migration rod connected to a container portion in which a viscous fluid is sealed in the accommodation space. Since it is configured to be supported in a floating state, vibration resistance is improved compared to conventional support using only vibration-proof rubber or coil springs, and the rise in Q value in the resonance region is significantly reduced. This makes skipping less likely.

The damper is composed of a container made of an elastic material, a viscous fluid sealed in a storage space formed in the container, and a migration rod connected to the container. A cylindrical migration part protruding into space, a thick ring-shaped stopper part formed at intervals around the outer periphery of the migration part, and a stopper part interposed between the stopper part and the migration part. Since the damper only needs to be provided with a thin ring-shaped connecting portion, the structure of the damper is simple and can be miniaturized, resulting in a good space factor and easy installation and handling.

Further, since the ring-shaped groove is formed between the ring-shaped stopper portion and the thin ring-shaped connecting portion, facing the first abutting surface, the connecting portion between the stopper portion 44 and the thin-walled connecting portion is formed in the first contact surface. The joint is located at a position sufficiently further from the contact surface than the second contact surface, so even if the first and second contact surfaces repeatedly collide relatively strongly, the joint portion will not be damaged. There is no fear that the viscous fluid in the housing space of the container will flow out, and as a result, damage to the optical disc player can be effectively prevented.

[Brief explanation of the drawing]

Figures 1 to 11 show an embodiment in which the present invention is applied to an on-vehicle optical disc player, in which Figure 1 is a perspective view of the main parts showing how the mechanical deck is attached to the chassis, and Figure 2 is a perspective view of the main parts. 3 is a sectional view taken along the line - in FIG. 1, FIG. 4 is a perspective view of the entire optical disk player, and FIG. 5 is an enlarged exploded perspective view of the damper shown in FIG. 1. Figure 6A is an enlarged longitudinal cross-sectional view showing the neutral equilibrium state of the same damper, and Figure 6B is the B--B of Figure 6A.
The sectional view taken along the line B, FIG. 6C, and FIG. 6D are enlarged longitudinal sections similar to FIG. 6A, showing the damper deformed from the neutral equilibrium position in a direction perpendicular to its axis and in an axial direction, respectively. 7 is an enlarged plan view showing the installation state correction mechanism shown in FIG. 1, FIG. 8 is a sectional view taken along the line -- in FIG. 7, and FIG. 9 is an exploded perspective view of the installation state correction mechanism shown in FIG. Figure, 10th
The figure is the same as Figure 3 when the optical disc player is installed at a certain angle to the horizontal at the player mounting point in the car without adjusting the correction coil spring, and Figure 11 is for correction. A view similar to FIG. 10 with the optical disc player installed after the coil spring adjustment operation,
FIG. 12 is a view similar to FIG. 7 showing another embodiment of the attachment state correction mechanism, and FIG. 13 is a sectional view taken along the line -- in FIG. 12. In addition, in the symbols used in the drawings, 1... Chassis (frame), 2... Mecha deck, 3a...
...Turntable, 6...Optical pick-up, 1
0... Suspension coil spring (biasing means for elastic support),
11...damper, 11a...container section, 11b...
Electrophoresis rod, 12...Installation state correction mechanism, 3
0... Cabinet, 38... Outer surface of side wall of mechanical deck (first contact surface), 39... Side surface of flange portion (second contact surface), 40... Accommodation space, 4
DESCRIPTION OF SYMBOLS 1...Migration part, 44...Stopper part, 49...Connecting part, 50...Groove.

Claims (1)

[Scope of utility model registration request] A mechanical deck equipped with an optical pickup, a turntable, etc. is elastically supported on the frame by means of elastic support biasing means provided at multiple locations, and a damper for absorbing vibrations of the mechanical deck is attached to the frame. and the mechanical deck, and the optical disk player is configured to support the mechanical deck in a floating state with respect to the frame, wherein the damper is made of an elastic material;
The container is composed of a viscous fluid sealed in a storage space formed within the container, and an electrophoresis rod coupled to the container, and the container is connected to one of the frame and the mechanical deck. In addition, the electrophoresis rods are attached to the other, and the container part has a cylindrical electrophoresis part protruding into the accommodation space, and a thick-walled electrophoresis part formed at intervals around the outer periphery of the electrophoresis part. The ring-shaped stopper part and the thin ring-shaped connecting part interposed between the stopper part and the migration part are respectively provided, and the ring-shaped stopper part is connected to the other of the frame and the mechanical deck. a ring-shaped second contact surface facing the first contact surface provided between the stopper portion and the connecting portion; An optical disk player characterized in that a groove is formed and the migration rod is fitted into the cylindrical migration section.