JPS6353414B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for smoothly moving a reading device of an optical video disc player, which is capable of reading signals recorded on a disc surface using a laser beam or the like and reproducing images, in a tracking direction. The present invention relates to a retainer mechanism suitable for use with a slider that can be used.

Optical video disc players use a disc with many pits recorded on its surface, and irradiate the disc surface with a laser beam while rotating the disc at high speed.
Images and sounds can be reproduced by optically reading the 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 in the radial direction of the disc to follow the track of the disc, and this movement of the reading device must be carried out extremely smoothly. is preferable. For this reason, in the past, V-shaped grooves were formed on each side of the slider to which the guide rail and reading device were fixed, and the rollers held by a retainer between the two grooves were partially caulked. It was inserted to reduce movement friction. However, in the conventional configuration, in order to prevent the retainer holding the rollers from falling off the groove surface, the rollers had to be held with a strong pressure of tens of kilograms from both sides. Moreover, since the retainer is not directly held by either the guide rail or the slider, it is difficult to accurately position and assemble the retainer with respect to the guide rail and slider. Additionally, it was necessary to caulk a portion of the retainer to prevent the rollers from separating from the retainer.

In view of the above-mentioned drawbacks, the present invention restricts the rollers with a retainer and engages the retainer with the guide rail to hold the retainer so that it can freely move in the length direction of the guide rail and prevent the retainer from falling off. The purpose of the present invention is to provide a retainer mechanism that can easily assemble a retainer, a guide rail, and a slider while applying pressure. Further, in the present invention, the above-described structure allows the retainer to be integrally formed with synthetic resin, and furthermore, allows the rollers to be held in a detachable manner.

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 step on the top surface of the main body 1 where the lid 4 can be opened and closed, and a spindle shaft 7 that holds a disk and rotates it at high speed protrudes from the center of the middle plate 6. 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 reproduced 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 is read. It is possible to read the signals recorded on the board.

FIG. 2 shows the mechanical palm 46 arranged parallel to the middle plate 6 taken out and the reading device 9 seen from the back side thereof. 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, with the moving port 8 in between, 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 stand 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 stand 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 molded from 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 step portion 21 formed on the outside of the guide rail 10. 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. Elongated rack bodies 28 are fixed to both sides of the upper surface of the slider 11, and rack teeth 29 formed on the rack bodies 28 are fixed to both sides of the upper surface of the slider 11.
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 number of teeth is 1:2.) FIG. There is play due to the difference in height, and the driven gear 25 has an angle θ with respect to the driving gear 26.
can only rotate freely.

FIG. 6 shows an exploded view of the mechanism in the vicinity of 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 34 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 meshing state of the drive gear 34, intermediate gear 35, and rack body 28. The intermediate gear 35 has a shaft hole 37 penetrated through the center, and the intermediate gear 35 has an inner ring part 38 annularly surrounding the shaft hole 37 and an outer ring part 39 which is spaced apart from the inner ring part 38 and has a larger diameter. It consists of an inner ring part 38 and an outer ring part 3.
9 are connected to each other by 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
Regarding the relationship between the shape of the roller 17 and the shape of the roller 17, the length between the left and right side walls of the window 41 is made slightly larger than the diameter of the roller 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. At this time, the slider 11 and the retainer 14 can be easily positioned with respect to the guide rail 10 because the retainer 14 is held by the guide rail 10.

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.
The reading device 9 must be moved slowly in the radial direction of the video disc. 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 drive gear 34 and the intermediate gear 35, and between the intermediate gear 35 and the rack body 28, and the slider 11 can be moved reliably 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 this roller 17, since the guide rail 10 is fixed,
The retainer 14 that holds the rollers 17 is the slider 11
The slider 11 moves in the moving direction at half the speed of the slider 11. Therefore, the moving distance of the retainer 14 is one half of the moving distance of the slider 11. No matter how many times the slider 11 is moved, the retainer 14
will not fall off. However, in reality, Colo 17
As the retainer 14 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. The driven gear 25 rotates around the pivot pin 24, but since the rack 23 is engaged with the driven gear 25, the retainer 14 is forcibly pushed in the same direction as the moving direction of the rack body 28. will be done. 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. Also,
The driving gear 26 and the driven gear 25 are connected in the configuration shown in FIG. 4, and since the lengths of the pin 27 and the engagement port 32 are different, the driven gear 25 is connected by the angle θ as shown in FIG. Play is occurring. For this reason,
It is easy to assemble both gears 25 and 26, and the drive gear 26 becomes a driven gear after a certain amount of misalignment between the slider 11 and the retainer 14 caused by rotational slippage of the rollers 17 accumulates. 25, and when the accumulation of slippage due to the rotation of the rollers 17 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 both the slider 11 and the retainer 14 can move smoothly.

The present invention provides a pair of guide rails arranged parallel to each other at appropriate intervals on a chassis, a slider disposed between the guide rails and moving along the length of the guide rails, and a surface facing the guide rails and the slider. rollers that are housed in V-shaped roller grooves formed in the grooves and have oblique rotational axes; and a retainer that can be engaged with the guide rail and that has an opening in the regulating plate into which the rollers are inserted. By providing a rack formed on a rack body provided on the slider and a rack formed on the regulating plate, and coaxially providing a plurality of gears having different numbers of teeth that mesh with the respective racks. Since the slider and the retainer are configured to move at increased speed relative to each other via the gear, the rack formed on the rack body provided on the slider and the rack formed on the regulating plate are respectively Although they are made of separate members, a plurality of gears having different numbers of teeth meshing with these gears are coaxially provided, so that the slider and the regulating plate can reliably move in synchronization with each other and increase their speed. Furthermore, even when synchronizing the gears that mesh with the racks formed on the rack body provided on the slider and the racks formed on the regulating plate, since the gears are provided on the same axis, They can be easily synchronized and assembled. Furthermore, since multiple gears are provided on the same axis, compared to the case where gears are provided on multiple axes,
It is possible to reduce the number of rotating axes, thereby reducing costs. In addition, the present invention uses rollers housed in V-shaped roller grooves. Since the relative positioning of the slider and the regulating plate is also performed reliably, the movement of the reading device, which requires precision, can also be performed reliably. Moreover, since the present invention uses a plurality of different gears, it is possible to easily determine the speed increasing ratio by determining the number of teeth, and since these gears are provided on the same axis, once the speed increasing ratio is determined, Since the relative stroke between the slider and the retainer is also determined, it is suitable for use in a mechanism similar to the retainer mechanism of the present invention.

Further, in the present invention, the slider to which the reading device is fixed can be smoothly moved between the guide rails by the rollers, and since the rollers are regulated by the retainer, they will not fall off the guide rails and will not fall off the rollers. There is no need to increase the applied lateral pressure. Therefore, unnecessary force is not applied to the retainer, and it can be integrally formed of synthetic resin.Furthermore, since it is made of synthetic resin, it is possible to adopt a configuration in which the rollers can be detachably held. Furthermore, since the retainer is engaged with and held by the guide rail, it is easy to handle the retainer when assembling it at an appropriate position with respect to the guide rail and the slider.

[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. FIG. 8 is an exploded perspective view showing the relationship between the retainer and the rollers, FIG. 9 is a sectional view showing the rollers in the roller groove, and FIG. 10 is a partially enlarged view showing the state in which the rollers are installed. 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 club, 46... Mechashashi.

Claims (1)

[Claims] 1. A pair of guide rails arranged parallel to each other at appropriate intervals on the chassis, a slider that moves along the length of the guide rails, and a A roller accommodated in a V-shaped roller groove and having oblique rotation axes can be engaged with the guide rail,
a retainer in which a regulating plate is provided with an opening into which the roller is inserted; a rack formed in a rack body provided on the slider; and a rack formed in the regulating plate; A retainer mechanism characterized in that a plurality of meshing gears having different numbers of teeth are provided on the same axis, so that the slider and the retainer relatively move at increased speed via the gears.