JPH034986B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Technical Field] The present invention relates to an optical video disc player and the like that can read signals recorded on a disc surface using a laser beam or the like and reproduce images.
In particular, the present invention relates to a disk player moving device that can smoothly move a reading device in a tracking direction.

[Background of the Invention] An optical video disc player uses a disc with a large number of pits recorded on the disc surface, and irradiates the disc surface with a laser beam while rotating the disc at high speed.
Images and sounds can be reproduced by optically reading this reflected light and converting it into electrical signals. In this optical video disc player, a reading device mounted on a slider must be mechanically moved relatively in the radial direction of the disc to follow the track of the disc, and the movement of this reading device is extremely smooth. It is preferable to have it carried out.

[Prior Art] Conventionally, rollers were interposed between the guide rail and the slider to allow the slider to move smoothly. To move the slider, a rack and gears were used to convert the rotational motion of the drive motor into reciprocating motion.

[Problem to be Solved by the Invention] However, since the reading device (or disk rotation motor) fixed to the slider is quite heavy, it is difficult to slide onto the slider by tilting the video disk player. This creates a load. All of this load was applied to the gear meshing with the rack, and if the load became too large, the rack or gear teeth would be damaged.

[Purpose of the Invention] In view of the above-mentioned drawbacks, the present invention provides a clutch mechanism that releases the engagement between the rack and the gear when the load becomes large, so that unreasonable stress is not applied to the tooth surfaces of the rack and the gear. Therefore, it is an object of the present invention to provide a disk player moving device that can prevent the occurrence of failures.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings.

Figure 1 shows the external appearance of the main body 1 of the optical video disc player.The operating section 2 and display section 3 are provided on the right side of the top surface of the main body 1, and the main body 1 is provided on the left side.
A lid body 4 is provided which can be opened and closed by a hinge 5, and the top surface of the lid body 4 can be opened wide. A middle plate 6 is provided horizontally with a shallow gap on the top surface of the main body 1 where the lid 4 can be opened and closed, and a spindle shaft 7 protrudes from the center of the middle plate 6 to hold a disk and rotate it at high speed. Furthermore, a moving port 8 is opened in the middle plate 6 in a radial direction around the spindle shaft 7. The head of a reading device 9 for emitting a laser beam and taking in reflected light is projected from the moving port 8, and the reading device 9 can reciprocate along the direction of the moving port 8. There is. With this configuration, a disc (not shown) to be played is fixed to the spindle shaft 7, rotated in one direction by the spindle shaft 7, and while rotating, the reading device 9 is moved to follow the track of the disc, and the disc surface is The mechanical palm 46 placed parallel to the middle plate 6 is taken out and the reading device 9 is seen from the back side of the mechanical palm 46 in FIG. 2. A pair of guide rails 10 are fixed to the back surface of the mechanical chassis 46 so as to be parallel to each other with an interval between them, and a flat slider 11 with a reading device 9 placed between the guide rails 10. is slidably supported. A V is provided on each side of the guide rail 10 and slider 11.
Letter-shaped roller grooves 12 and 13 are formed, and cylindrical rollers are interposed between the roller grooves 12 and 13 to support the slider 11 so that it can move smoothly. A retainer 14 is engaged with each guide rail 10 so as to be movable in the length direction thereof, and the retainer 14 prevents the rollers from falling out of the V-grooves 12 and 13. A motor support 15 formed by bending a thin plate into a Z-shape is fixed to the back surface of the mechanical chassis 46 at a position close to the center of one side of the guide rail 10, and a slider 1 is mounted on the motor support base 15.
A drive motor 16 for moving 1 is fixed.

FIG. 3 shows a cross section of the moving mechanism of the reading device 9, in which a plurality of cylindrical rollers 17 (six for each retainer 14) are interposed between the roller grooves 12 and 13. Each roller 17 is a retainer 1
The regulation is maintained at 4. The retainer 14 is integrally formed of synthetic resin and is positioned parallel to the upper surface of the guide rail 10. On one side of the retainer 14 on the slider 11 side, a flat regulating plate 1 for holding the rollers 17 is provided.
8 are connected at right angles, and on the opposite side there is an engaging rod 19.
are arranged at right angles. A claw portion 20 is formed at the tip of this engaging rod 19, and the claw portion 20 is engaged with a cut portion 21 formed on the outside of the guide rail 10, and the retainer 14 is held by the regulating plate 18 and has a roller groove. Although the guide rail 10 can be moved in the length direction by the rollers 17 that engage with the guide rail 12 and the engagement rod 19, it cannot be pulled out upward. Retainer 1
4 has an elongated opening 22 extending along its length.
A rack 23 is provided on one of the inner walls of the opening 22. The guide rail 10
A pivot pin 2 is provided on the top surface of the
A driven gear 25 and a driving gear 26 that mesh with the rack 23 are rotatably inserted into the shaft support pin 24, and a pin 27 protruding from the upper surface of the driven gear 25 connects the driven gear 25 and a drive gear 26 are connected. A long and narrow rack body 28 is fixed to both sides of the upper surface of the slider 11, and a rack gear 2 formed on this rack body 28 is fixed to each side.
9 is meshed with the drive gear 26.

FIG. 4 shows the driven gear 25 and the driving gear 26 in detail, and the driven gear 25 has a shaft hole 3 in the center.
0 is passed through the shaft hole 30, and pins 27 are projected from one side of the shaft hole 30 at opposing positions. A shaft hole 31 is opened through the center of the drive gear 26, and a half-moon-shaped engagement port 32 is opened at a position opposite to the shaft hole 31.
The length of this engaging port 32 is made slightly longer than the length of the pin 27. The ratio of the diameters of the driven gear 25 and the drive gear 26 is set to 1:2. (In other words, the ratio of the gears is 1:2.) Fig. 5 shows the connected state of the driven gear 25 and the driving gear 26, and the pin 27 inserted into the engagement opening 32 of the driving gear 26 has its length. There is play due to the difference in the angle θ of the driven gear 25 with respect to the driving gear 26.
can only rotate freely.

FIG. 6 shows an exploded view of the mechanism near the retainer 14 and the rack body 28.
A driving shaft 33 that rotates at a reduced speed by a drive motor 16 is supported downwardly, and a driving gear 34 is fixed to this driving shaft 33. Also,
A shaft support pin 36 is projected from the lower surface of the motor support base 15, and a drive gear 35 is attached to this shaft support pin 36.
An intermediate gear 35 that meshes with is pivotally supported. This intermediate gear 35 has rack teeth 29 of the rack body 28.
are in mesh with each other, converting the rotational movement of the drive shaft 33 into reciprocating movement of the rack body 28.

FIG. 7 shows the state in which the driving gear 34, intermediate gear 35, and rack body 28 are engaged with each other. The intermediate gear 35 has a shaft hole 37 penetrated through the center thereof, and the intermediate gear 35 has an outer ring portion 39 with a larger diameter spaced apart from the inner ring portion 38 of an inner ring portion 38 annularly surrounding the shaft hole 37. It consists of an inner ring part 38 and an outer ring part 3.
9 through three fork-shaped connecting portions 40. Therefore, the intermediate gear 35
0, it has elasticity in the outer circumferential direction.

FIG. 8 shows the relationship between the retainer 14 and the rollers 17. Regulation plate 1 on one side of retainer 14
8 has rectangular windows 41 opened at predetermined intervals, and edge portions 42 and 43 with sharp tips are formed on the upper and lower sides of the window 41, respectively. The upper edge part 42 is formed firmly with respect to the regulating plate 18, but the lower edge part 43 is formed elastically so that the opening area of the window 41 can be expanded or contracted. The roller 17 has a cylindrical shape, and a protrusion 44 is provided at the center of each of its flat surfaces to prevent it from coming off. Said window 41
The relationship between the rollers 17 and the rollers 17 is such that the length between the left and right side walls of the window 41 is slightly larger than the diameter of the rollers 17.

FIG. 9 shows the relationship between the roller 17, the roller grooves 12, 13, and the edge portions 42, 43.
It rotates while being supported at an angle of 45 degrees by the letter-shaped roller grooves 12 and 13. Edge portions 42, 43
The tips of the rollers 17 are located at the steps formed by the projections 44, and are hooked onto the rollers 17 and the projections 44, so that even if the retainer 14 is removed from the roller grooves 12 and 13, the rollers 17 will not come off the window 41. There is.

FIG. 10 shows the procedure for attaching the roller 17 to the edge parts 42 and 43. The upper edge part 42 has both ends fixed to the regulating plate 18, and the lower edge part 43 has both ends fixed to the thin bridge. It is supported with flexibility by the section 45. Therefore, the upper edge portion 42 is fixed in position with respect to the retainer 14, whereas the lower edge portion 43 is freely swingable in the direction A with respect to the vertical direction. To attach the rollers 17 to the retainer 14, the rollers 17 are tilted at about 45 degrees and the upper part B of the rollers 17 is engaged with the upper edge portion 42. In this state, the distance D between the upper part B of the roller 17 and the lower end C of the protrusion 44 is
Since the distance between the edge portions 42 and 43 is formed slightly smaller than that of 3, the lower end C of the protrusion 44 is in contact with the lower edge portion 43, and the roller does not fit into the window 41. When the roller 17 is pushed further, the lower edge portion 43 is pushed down by the lower part C of the projection 44, expanding the opening area of the window 41, and the roller 17
The lower protrusion 44 is inserted into the window 41. Thereafter, the edge portion 43 returns to its original state due to its elasticity and engages with the stepped portion on the side surface of the projection 44, and the roller 17 will not come off from the window 41 unless it is pulled out again against the elasticity of the edge portion 43. In this way, Koro 1
The retainer 14 on which the retainer 7 is attached is fixed on the mechanical chassis 46 with screws or the like.From the longitudinal direction of one guide rail 10, the rollers 17 and the roller grooves 12, and the claw portions 20 and the step portions 21 correspond to each other. By inserting the retainer 14 into the guide rail 10
can be held. Thereafter, the other guide rail 10 holding the retainer 14 is moved through the slider 11 to the one guide rail 1.
The other guide rail 10 is biased in the 0 direction by a spring (not shown) and fixed onto the mechanical chassis 46 with screws or the like.

FIG. 11 shows an exploded view of the clutch mechanism. Near the center of the motor support base 15, an elliptical gear opening 47 and a pin opening 48 are opened. is carved out.
Further, a shaft opening 50 is opened at the end of the motor support base 15, and a switch stop portion 51 is bent at a position opposite to the shaft opening 50. 52 is a rocking plate;
It has a flat square shape, and a pivot pin 36 is installed in the center thereof, and a hole 53 through which the gear 34 passes is located near the pivot pin 36.
is open. A shaft opening 5 is provided on one side of the swing plate 52.
4 and a spring receiver 55 are respectively provided. To assemble this clutch mechanism, since the drive gear 34 is pivotally attached to the drive motor 16 housing the reduction gear mechanism, the drive gear 34 is projected from the opening 53 and the drive motor 16 is attached to the swing plate 52. Fasten with screws. This rocking plate 52 is made to face the motor support base 15, and the driving gear 34 is inserted through the gear opening 47, the shaft support pin 36 is inserted through the pin opening 48, and the two shaft openings 50, 54 are inserted.
Insert the shaft pin 56 and attach the motor support base 15.
The swing plate 52 is swingably connected to the swing plate 52. The coil spring 5 is placed between the pair of spring receivers 49 and 55.
7 is hooked, and the rocking plate 52 is always elastically biased in one direction. After this, the intermediate gear 35 is pivotally supported by the pivot pin 36. Moreover, the switch stop part 5
A microswitch 58 for detecting the position of the reading device 9 is screwed to 1.

Next, the operation of this embodiment will be explained.

Video disc to be played (not shown)
, lift the lid 4 to expose the inside, and fix the video disc to the spindle shaft 7. The main body 1 is operated by closing the lid 4 and operating the operating section 2, and the spindle shaft 7 rotates at high speed to drive the video disc. At the same time, a laser beam is emitted from the reading device 9 and illuminates the surface of the video disc, and the reflected light enters the reading device 9 again, and the signal recorded on the video disc is extracted as an electrical signal. In this signal reading operation, if the reading device 9 is stopped at the same position on the circumference of the video disc, only the same signal can be read, so the reading device 9 must be moved gently in the radial direction of the video disc. No. By moving the reading device 9, the irradiation position of the laser beam can always follow the track on the surface of the video disc, and signals such as video and audio can be reproduced.

As described above, the movement of the reading device 9 is important in a video disc player, and the reading device 9 is moved by the mounted slider 11, and the slider 11 is guided by the rollers 17. Smooth movement is guaranteed only in the longitudinal direction of the rail 10. The slider 11 is moved by a drive motor 16 that accurately follows the track.
The rotational output of the drive motor 16 is decelerated by a gear and taken out from the driving shaft 33. The rotational force of the driving shaft 33 rotates the driving gear 34, and the rotation of the driving gear 34 causes the intermediate gear 35 to follow, and the rotation of the intermediate gear moves the rack body 28 via the meshing rack teeth 29. let Since this rack body 28 is fixed to the slider 11, the slider 11 reciprocates along the guide rail 10. The intermediate gear 35
As shown in FIG. 7, the center and the outer periphery are held by the connecting portion 40, so it is resilient against force from the outer periphery, and the drive gear 34 is held in the rack body 2.
Even when pressed in eight directions, it deforms due to its elasticity and can be engaged with the rack body 28 while constantly applying pressure. Therefore, no backlash occurs between the driving gear 34 and the intermediate gear 35, and between the intermediate gear 35 and the rack body 28, and the slider 11 can be reliably moved in response to the control signal. When the slider 11 moves, the rollers 17 pressed between the slider 11 and the guide rail 10 rotate and move in the direction in which the slider 11 moves. Therefore, assuming that there is no slippage in the rotation of the rollers 17, since the guide rail 10 is fixed, the retainer 14 that holds the rollers 17 moves in the direction of movement of the slider 11 at half the speed of the slider 11. will be moved to. Therefore, the moving distance of the retainer 14 is one half of the moving distance of the slider 11. As long as there is no slippage in the rotation of the rollers 17, no matter how many times the slider 11 is moved, the retainer 1
4 does not fall off. However, in reality, Koro 1
When the retainer 7 rotates, slippage occurs, and if this slippage accumulates, the retainer 14 will fall off the guide rail 10. However, in the present invention, when the rack body 28 moves, the drive gear 26 meshed with the rack teeth 29 is rotated around the pivot pin 24, and the rotation of the drive gear 26 is controlled by the pin 27 to the driven gear 25. can be conveyed to. Driven gear 25
will rotate around the pivot pin 24,
Since the rack 23 meshes with the driven gear 25, the retainer 14 is forcibly pushed in the same direction as the moving direction of the rack body 28. Moreover, since the gear ratio of the driven gear 25 and the driving gear 26 is set to 1:2, the retainer 14 is forcibly driven as if there were no slippage in the rotation of the rollers 17, and the retainer 14 is forced to move away from the guide rail 10. It won't fall off. Further, the driving gear 26 and the driven gear 25 are the fourth
Since they are connected in the configuration shown in the figure and the lengths of the pin 27 and the engaging port 32 are different, the driven gear 25 has play by an angle θ as shown in FIG.
Therefore, it is easy to assemble both gears 25 and 26, and the drive gear 25 and 26 can be assembled after a certain degree of misalignment between the slider 11 and the retainer 14 caused by rotational slippage of the rollers 17 has accumulated.
will rotate the driven gear 25, and the roller 1 will rotate.
When the accumulation of slippage during the rotation of No. 7 is within the permissible range, unnecessary force is not applied to the retainer 14 side. Therefore, no excessive force is applied to the drive motor 16, and the slider 11 and retainer 1
4 can be moved smoothly. Further, since the ratio of the diameters of the driven gear 25 and the driving gear 26 is set to 1:2, the rack body 28 and the slider 11
The retainer 14 will move by only half the distance that the retainer 14 moves. Therefore, the retainer 14 moves by half the amount of movement near the center of the slider 11, does not shift toward the ends of the slider 11, and focuses only on the center portion where the weight is applied. can be supported.

Next, when the video disc player 1 is tilted or subjected to some kind of impact, the reading device 9 is heavy, so the slider 1 is moved by gravity or inertia.
A force acts to cause the slider 1 to slide in the direction of the guide rail 10. The force that causes the slider 11 to move is exerted by the intermediate gear 35 meshing with the rack body 28.
, and acts to rotate the intermediate gear 35. However, since the drive gear 34 is meshed, the intermediate gear 35 does not rotate freely, and the slider 11 is held in that position when the load by the rack body 28 is light. However, when the load caused by the slider 11 to move becomes large, the intermediate gear 35 cannot resist the load, and the shaft pin 5 opposes the biasing force of the coil spring 57.
6, rotate the rocking plate 52 around the rack tooth 29.
The meshing of the intermediate gear 35 is released, and the slider 11
Let it slide freely. As shown in FIG. 12, the swing plate 52 can swing within the range of angle α around the shaft pin 56, so if a force that cannot be countered by the coil spring 57 is applied to the intermediate gear 35, it will move in a direction that causes the intermediate gear 35 to escape. be able to respond. When the slider 11 slides to the maximum of its movement range, the slider 11 comes into contact with a rubber stopper (not shown) at the end and stops, and then the coil spring 57
The intermediate gear 35, which has moved back due to the elastic force, meshes with the rack teeth 29 again and prepares for the next operation.

In addition, in this embodiment, the rack body 28 and the intermediate gear 3
Although the intermediate gear 35 is pivotally supported in a swingable manner so as to release the meshing of the intermediate gear 35, the present invention is not limited to this embodiment. The structure may be such that the body 28 allows the intermediate gear 35 to freely rotate to release the load.

[Effects of the Invention] Since the present invention is configured as described above, when the slider is forcibly moved in the moving direction due to external influences, the clutch mechanism operates to release the interlock between the rack and the gear, and the slider Since the gear can be moved freely and no unreasonable stress is applied to the tooth surface of the rack or gear, accidents such as tooth breakage do not occur and breakdowns can be prevented.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the appearance of a video disc player which is an embodiment of the present invention, FIG. 2 is a perspective view showing the reading device and the moving mechanism with the mechanical chassis turned over, and FIG. 3 is a sectional view of the moving mechanism. Fig. 4 is an exploded perspective view of the driven gear and the driving gear, Fig. 5 is an explanatory view showing the relationship between both gears, Fig. 6 is an exploded perspective view showing the vicinity of the retainer in detail, and Fig. 7 shows the driving gear. Partial view, Figure 8 is an exploded perspective view showing the relationship between the retainer and rollers, Figure 9 is a sectional view showing the rollers in the roller groove, Figure 10 is a partially enlarged view showing the installed state of the rollers, and Figure 11 is an exploded perspective view showing the relationship between the retainer and the rollers. An exploded perspective view showing the mechanism;
FIG. 12 is an explanatory diagram showing the operation of the clutch mechanism. DESCRIPTION OF SYMBOLS 1...Video disc player main body, 2...Operation unit, 3...Display unit, 4...Lid body, 5...Hinge,
6... Middle plate, 7... Spindle shaft, 8... Moving port, 9... Reading device, 10... Guide rail, 1
1... Slider, 12, 13... Roller groove, 14...
... Retainer, 15 ... Motor support stand, 16 ... Drive motor, 17 ... Roller, 18 ... Regulation plate, 19
...Engagement rod, 20...Claw part, 21...Step part, 22
...Opening, 23...Rack, 24...Spindle pin,
25... Driven gear, 26... Drive gear, 27...
Pin, 28...Rack body, 29...Rack tooth, 3
0, 31... Shaft hole, 32... Engagement port, 33... Drive shaft, 34... Drive gear, 35... Intermediate gear, 3
6... Pivotal support pin, 37... Shaft hole, 38... Inner ring part, 39... Outer ring part, 40... Connection part, 41...
Window, 42, 43...Edge part, 44...Protrusion,
45...Bridge part, 46...Mecha chassis, 4
7...Gear port, 48...Pin port, 49...Spring receiver, 50...Shaft port, 51...Switch stop portion, 5
2...Swing plate, 53...Port, 54...Shaft port, 5
5...Spring receiver, 56...Axis pin, 57...Coil spring, 58...Micro switch.

Claims (1)

[Claims] 1. A guide rail fixed in parallel to the chassis at intervals, a retainer having a regulating plate for holding rollers and having a rack formed thereon and sliding along the guide rail, and a retainer that slides along the guide rail via the rollers. a slider disposed slidably along the slider; a rack provided on the slider and provided with a rack; The driving gear includes a plurality of gears having different numbers of teeth and a gear that drives the rack body, and the driving gear is provided with a clutch mechanism that prevents transmission of driving force when a load exceeding a predetermined value is applied to the driving gear. A disk player moving device characterized by: