JPH02131163A - Coating device - Google Patents

Abstract

PURPOSE:To prevent the occurrence of defects due to the dripping of liquid on the coated layer of a disk by providing a holding member for holding the disk vertically which is immersible in a liquid and forming a specific protruding part and a sharply pointed part on the holding member. CONSTITUTION:When a lubrication layer is formed on a disk by application, for instance, first a disk 4 connected to a shaft 3 is immersed in a mixed liquid such as lubricant, and the shaft 3 rises. The liquid level of the mixed liquid moves downward as a shaft 3 ascends, reaching a sharply pointed part 3a on the lower surface of the shaft 3 soon. The sharply pointed part 3a inclines toward a supporting block 10a, and a crossing point between the liquid level and the sharply pointed part 3a moves from the tip of the shaft 3 to the supporting block 10a side. In addition, the sharply pointed part 3a consists of flat surfaces 3b, 3c and moves between a disk 4a and a clearance. Therefore the mixed liquid does not drip on the surface of the disk 4. The shaft 3 further rises and the crossing point moves to a protruding member 12. Even when the shaft 3 is exposed above the liquid level, the liquid neither shakes nor drips.

Description

[Detailed Description of the Invention] [Industrial Field of Application J] The present invention provides a method for pulling up a disk immersed in a liquid.
The present invention relates to a coating device that prevents liquid shaking and dripping from occurring.

[Prior art and problems to be solved by the invention] In recent years, with the development of electronic devices, disks with magnetic layers, protective layers, and lubricant layers formed on the surface with angstrom precision have become widely used as recording media. has been done.

For example, the lubricating layer on the surface of the disk is generally formed by immersing the disk in a liquid containing a mixture of fluorocarbon liquid, lubricant, etc., and then pulling the disk out again after a predetermined period of time and drying it. It is true. In this case, when the surface of the disk is gripped, a missing portion of the lubricant layer is formed in the gripped area, so a holding member such as a shaft provided horizontally is inserted into the hole formed in the center of the disk. Accordingly, means are taken to hold the disk vertically.

When this holding member is immersed in the liquid surface, even if the holding member causes disturbance of the liquid level, so-called liquid shaking, the disk will be immersed in the liquid afterwards, which will have an adverse effect on the disk. It will never reach you.

However, the liquid shaking is likely to occur when the holding member rises above the liquid level, and there is a possibility that waves generated by this liquid shaking may reach a portion of the disk that is already exposed above the liquid level.

Further, even after the holding member is completely lifted above the liquid level, the liquid adhering to the surface of the holding member drips onto the disk, so-called dripping occurs, and the liquid on the disk is exposed. There is also a possibility that it may affect the affected areas.

When new liquid is applied to areas on the disk surface that have been exposed faster than the liquid due to liquid shaking or dripping, the thickness of the lubricant layer at the area where this new liquid has been applied becomes thicker than other areas, and the lubricant layer is It becomes impossible to maintain the accuracy of

[Object of the Invention] The present invention has been made in view of these circumstances, and is intended to prevent the liquid from shaking at the liquid level when the disk holding member is raised above the liquid level, and to solve the above-mentioned problems. It is an object of the present invention to provide a coating device that prevents liquid from dripping from a holding member onto a disk.

[Means and operations for solving the problem] The coating device according to the present invention is provided with a holding member that holds the disk in the vertical direction so as to be immersed in liquid, and in which the holding member is provided with a portion below the lower end of the disk. A protruding portion is provided, and a continuous sharp portion is formed on the lower surface of the holding member to incline downward toward the protruding portion.

With this configuration, when the holding member is separated from the liquid surface, the portion where the liquid surface intersects with the sharp portion moves relatively toward the protrusion, thereby preventing disturbance of the liquid surface and dripping of the liquid. At the same time, by moving the protrusion away from the liquid surface after the disk is separated from the liquid surface, disturbances in the liquid level that occur when the protrusion is separated from the liquid surface are prevented from reaching the disk.

[Embodiments of the Invention] Hereinafter, embodiments of a coating apparatus according to the present invention will be described with reference to the drawings.

1 to 9 relate to one embodiment of the present invention, in which FIG. 1 is a front view of the holding member, FIG. 2 is a side view of the same, FIG. 3 is a front view of the coating device, and FIG. 4 is the same. A side view, FIG. 5 is a front view showing the relative movement between the holding member and the liquid level, FIG. 6 is a front view of the same, and FIG. 7 is a front view showing the relative movement between the protruding member and the liquid level. Front view, Figure 8 is an explanatory diagram of the installation distance of the disk, Figure 9
The figure is a comparison table showing the influence of disk installation distance on the lubrication layer.

The coating device of this embodiment is not shown in FIGS. 3 and 4.
In the lower part of the movable frame 1, an immersion chamber 1a and a tank chamber 1b are partitioned from side to side with division numbers, and above the immersion chamber 1a and tank chamber 1b, a transparent member 1C such as glass is formed. An installation chamber 1d is provided which can be opened and closed.

A dipping tank 2 with an upward opening is movably disposed in the dipping chamber 1a, while a predetermined amount of mixed liquid such as fluorocarbon liquid and lubricant is stored in the tank chamber 1b (not shown). The tank is stored. The above-mentioned mixed liquid can be set to any desired temperature, and the mixed liquid at this temperature is circulated between the tank and the above-mentioned immersion tank 2, and is also stored in this immersion tank 2. The liquid level can be maintained at any desired level.

Further, a shaft 3, which is an example of a moving member, is provided horizontally in a portion corresponding to above the tank 2 in the installation chamber 1d, and a magazine holding a plurality of disks 4 faces the shaft 3. 5 is arranged so as to be movable left and right. When the disk 4 is installed and the magazine 5 is moved in the direction of the shaft 3, the shaft 3 is inserted into the hole 4a of the disk 4, so that the disk 4 is held on the shaft 3. .

The shaft 3 is connected to an elevating device 7 provided on the back side of the frame 1, and when the shaft 3 is lowered by the elevating device 7, the disk 4 is immersed in the mixed liquid in the immersion tank 2. It is meant to be immersed.

That is, a screw shaft 8 that is rotated at a set rotation speed by a motor or the like (not shown) is erected on the lifting device 7, and one end of a pair of horizontal arms 9 is screwed onto the screw shaft 8. There is. A support shaft 10 having a support block 10a formed at its lower end is suspended from the end of the arm 9 opposite to the screw shaft 8. The space between the support shaft 10 and the support block 10a is continuous with a conical part 14 that is inclined at 30' to the right with respect to the vertical.

Further, a hole (not shown) is formed through the support block 10a, and one end of the shaft 3 is inserted through the hole. This shaft 3 is connected to a truncated cone-shaped fixing portion U11 disposed on the left and right sides of the support block 10a.
a. 11b. As shown in FIGS. 1 and 2, the upper and lower surfaces of the shaft 3 are connected to the support block 11a through the slopes of the fixing members 11a and 11b.
It is gently continuous around the outer periphery.

Furthermore, a protrusion 12 is provided at the lower part of the support block, and the protrusion 12 protrudes downward from the lower end of the disk 4 held by the shaft 3.

As shown in FIGS. 1 and 2, the front and rear of this protrusion 12 are parallel to the axis of the shaft 3 and 50 degrees from the horizontal.
It is composed of flat parts 12b and 12c formed at an angle of .degree., so that the lower end of the protruding part 12 forms a linear sharp part 12a. The sharp portion 12a is inclined downwardly at an angle of 5° with respect to the horizontal as it approaches the shaft 3 and #1.

Further, the side surface 12d of the protruding portion 12 on the shaft 3 side is also inclined downward as the distance from the shaft 3 increases, and the angle thereof is set at 45 degrees with respect to the horizontal plane.

On the other hand, a plurality of recesses 13 are formed on the upper surface of the shaft 3 at intervals of, for example, 15, and the inner periphery of the hole 4a of the disk 4 is engaged with the recesses 13.

Therefore, the magazine 5 can also set the disc 4 according to the spacing between the recesses 13. Further, the diameter of the shaft 3 is set so that when the disk 4 is locked in the recess 13, a gap is formed between the inner periphery of the hole 4a of the disk 4 and the lower surface of the shaft 3. .

Further, the upper surface of the shaft 3 has an arcuate cross section, while the lower surface is formed by a pair of slopes 3b, 3c that converge downward.
A linear sharp portion 3a is formed at the lower end where c converges. The angle of the sharp portion 3a formed by the above-mentioned angles 3b and 3C is set to 1206 degrees at the front end of the shaft 3 and 90 degrees at the side of the support block 10a. towards, horizontally 1.1
It is slanted downward at an angle of .

Next, the operation of the embodiment with the above-described configuration will be explained.

When forming a lubricating layer on the surface of the disk 4 on which the magnetic layer and protective layer have not yet been formed, the transparent member 1 of the installation part 1d
C is opened, and a magazine 5 in which disks 4 are arranged at predetermined intervals is installed in this installation section 1d. Then, while closing the installation part 1d with the transparent member 1C, the mixed liquid stored in the tank in the tank chamber 1b in an uncontrolled temperature state is sent to the dipping tank 2 in the dipping chamber 1a. The liquid level in the immersion tank 2 is set to a predetermined height, and the mixed liquid is circulated between the immersion tank 2 and the tank.

Next, when the magazine 5 is moved above the immersion chamber 1a, the shaft 3 is inserted into the hole 4a of the disk 4. When the magazine 5 is stopped with the recess 13 formed in the shaft 3 aligned with the inner periphery of the hole 4a of the disk 4, and the shaft 3 is slightly raised via the lifting device 7, the recess The inner circumference of the hole 4a is engaged with the inner circumference of the hole 4a, and the disc 4 is engaged with the shaft 3, and a predetermined gap is formed between the lower surface of the shaft 3 and the inner circumference of the hole 4a of the disk 4. Then, the magazine 5 is moved again above the tank chamber 1b, thereby being evacuated from above the immersion chamber 1a.

Next, the screw shaft 8 is rotated by the action of the lifting device 7, so that the arm 9 and the support shaft 10 are lowered,
The shaft 3, which is inserted through the support block 10a of the support shaft 10, is lowered into the immersion bath 2 at a set speed of, for example, 1 mm per second. This shaft 3
Even when the disk 4, which is locked on the disk 4, comes into contact with the surface of the mixed liquid, the arm 9 is further lowered, and eventually the disk 4
completely immersed in the mixture.

In this case, the upper surface of the shaft 3 has an arcuate cross section, and the support block 10a and the support shaft 10 are gently continuous on the slope of the conical part 14. When the shaft 3 and the support block 10a are submerged in the mixed liquid, the occurrence of so-called liquid shaking, which causes ripples on the liquid surface of the mixed liquid, is extremely prevented, and even if liquid shaking occurs, It is small and subsides in a short amount of time. Further, as mentioned above, the disk 4 is completely submerged in water after that, and the shaft 3
Even if liquid shaking may occur when the item is submerged in water,
This liquid shaking has no effect on the formation of a lubricant layer on the surface of the disk 4.

When the disk 4 is completely submerged in water and a predetermined period of time has elapsed, the screw shaft 8 is rotated by the elevating device 7 in the opposite direction to that described above, so that the shaft 3 starts to rise according to the set speed mark.

Then, first, the upper end of the disk 4 is exposed above the liquid level, and then the conical portion 14 and the upper surface of the shaft 3 are exposed. Since the upper end of the disk 4 is formed into an arc,
As long as the rising speed of the shaft 3 is appropriate, the liquid level will not ripple when this upper end is exposed, and
The support block 10a. Even when the upper surface of the shaft 3 is exposed, no liquid shaking occurs for the same reason as described above.

Note that even if the time from submersion to the start of rising is short and liquid shaking occurs during submergence, this liquid shaking has already subsided as described above, and the liquid level is lower than that of the disk 4. It will not affect exposed areas.

The liquid level of the liquid mixture is moved relatively downward as the shaft 3 rises, and eventually reaches the sharp portion 3a formed on the lower surface of the shaft 3. In this case, since the sharp portion 3a is inclined downward toward the support block 10a, first, the sharp portion 3a on the distal end side of the shaft 3
a is exposed from the liquid surface.

Then, as shown in FIGS. 5 and 6, the liquid level and the sharp part 3
As the shaft 3 rises, the intersection point C intersects with the support block 10a extends from the tip of the shaft 3
Move to the side. Therefore, no vibration occurs in the mixed liquid when the shaft 3 and the liquid surface are separated from each other.

Further, the sharp portion 3a is composed of flat parts 3b and 3c, and the remaining of the mixed liquid in this part is prevented as much as possible, and the mixed liquid is prevented from remaining on the flat surfaces 3b and 3c exposed from the liquid surface. Even if there is, the lower surface of the shaft 3 and the hole 4a of the disk 4 are pulled together by the surface tension at the intersection C, along with the intersection C along the slope of the sharp portion 3a.
Since the mixed liquid is moved toward the support block 10a through a predetermined gap formed between the tip and the inner periphery, the mixed liquid drips from the portion of the sharp portion 3a that is exposed from the liquid surface to the liquid surface and the surface of the disk 4. There's nothing to do.

As the shaft 3 is further raised, the intersection point C is eventually moved to the protruding member 12 via the surface of the fixing member 11b.

Therefore, even when the shaft 3 is completely exposed from the liquid surface, the liquid does not shake or drip.

When the intersection C is moved further below the protrusion 12, the lower end of the disk 4 is exposed from the liquid surface before the protrusion 12 is exposed from the liquid surface.

In this case, as shown in FIG. 8, there is a slight surface tension between the surface of the disk 4 and the liquid level.
When the lower end of the disk 4 and the liquid surface are separated from each other, there is a possibility that liquid shaking may occur, albeit slightly. Furthermore, in this case,
If the distance between the discs 4 is narrow, the 8th disc
As shown in Figure (a), the liquid level between these disks 4 is expanded by the surface tension of both disks 4, so that the liquid fluctuation becomes large.

On the other hand, as shown in FIG. 8(b), if the distance between the disks 4 is kept at a certain distance or more, the disks 4
The surface tension between the disks is so small that it can be ignored, and the liquid shaking that occurs when the lower end of each disk 4 separates from the liquid surface is subsided to some extent by the time it reaches the adjacent disk 4, This makes it possible to extremely minimize the influence on the disk 4.

For reference, FIG. 9 shows the results of an experiment showing the relationship between the installation interval of the disks 4 and the accuracy of the lubricant layer formed on the surface of the disks 4.

As shown in this figure, the relative velocity between the disk 4 and the liquid level is 1.
m per second, if the diameter of the disk 4 is 5.25 inches, commonly called 5 inches, the installation interval of the disks 4 is 12
．． If the pitch is 5 #lm, the thickness of the lubricating layer will vary by 10 angstroms or more, whereas if the pitch is 15, it is possible to maintain the accuracy within 5 angstroms.

Furthermore, if the diameter of the disk 4 is 3.5 inches, if the pitch is set to 10.5 m, there will be a variation of more than 10 angstroms, but if it is set to 12.5 m, the pitch will vary by 50 angstroms or more.
It is possible to suppress the variation to within angstroms.

As mentioned above, in this embodiment, the intervals between the recesses 13 that lock the respective disks 4 are, for example, 15 cm, so that
Regardless of whether the diameter of the disk 4 held by the shaft 3 is 3.5 inches or 5.25 inches, the thickness of the lubricating layer can be kept within 5 angstroms, which is practically acceptable.

When the disk 4 is completely exposed above the liquid level, the end of the protruding member 12 on the shaft 3 side is exposed above the liquid level, and as shown in FIGS. 5 and 7, the protruding member 12
The intersection point C between and the liquid level moves the sharp portion 12 in the opposite direction to the shaft 3. In this case as well, the sharp portion 3 of the shaft 3
The occurrence of liquid shaking is prevented by the same effect as explained in section a.

When the end of the sharp portion 12a opposite to the shaft 3 moves away from the liquid surface, a slight liquid shaking may occur, but the disk 4 has already been moved above the liquid surface. There is no possibility that this liquid shaking will have an adverse effect on the surface of the disk 4. Further, since the lower end of the protruding portion 12 and the liquid surface are separated from each other in point contact, even if liquid shaking occurs, this liquid shaking is very small and quickly subsides. Therefore, the water will be completely submerged by the time the next disk 4 is immersed in water, and will not have any effect on the disk 4 that will be immersed in the next process.

When the shaft 3 is raised to the installation chamber 1d and stopped at a predetermined height, the magazine 5 moves onto the immersion tank 2, holds the disk 4, and is again moved above the tank chamber 1b. This magazine 5 is transported to the drying room while holding the disks 4, while new disks 4 are placed in the installation chamber 1C.
Another magazine 5 holding the is installed, and the next process begins.

In this embodiment, since the inclined sharp portion 12a is also provided at the lower end of the protrusion member 12, the occurrence of liquid shaking and dripping is prevented as much as possible even when the protrusion member 12 is separated from the liquid surface. It has the effect of

Furthermore, in this embodiment, since the removable shaft 3 is used as an example of the holding member, it is possible to hold a large number of disks 4 at the same time, and the size and number of the held disks 4 can be changed. However, this holding member can be used not only for the shaft but also for other configurations, and furthermore, the above-mentioned shaft 3 can be easily replaced. The position of the holding and protruding member 12 of 3 is not limited to one end of the shaft 3.

Further, the sharp portion 12a of this protruding member 12 and the shaft 3
Further effects can be obtained by forming a continuous sharp part 3a and also forming a continuous sharp part between the sharp part 12a and the fixing member 11a.

Further, in this embodiment, the sharp portion 3a is configured with slopes 3a and 3b, but the sharp portion 3a may be configured in other configurations, such as by fixing and covering a plate-like member to the lower surface of the shaft 3. It is possible.

[Effects of the Invention] As explained above, according to the coating device of the present invention, when the disk holding member is raised above the liquid level, occurrence of liquid shaking on the liquid level is prevented, and the above-mentioned effect is achieved. This has the effect of preventing liquid dripping from the holding member.

[Brief explanation of drawings]

1 to 9 relate to an embodiment of the present invention, in which FIG. 1 is a front view of the holding part, FIG. 2 is a side view of the same, FIG. 3 is a front view of the coating device, and FIG. 5 is a front view showing the relative movement between the holding member and the liquid level, FIG. 6 is a front view of the same, and FIG. 7 is a front view showing the relative movement between the protruding member and the liquid level. Figure 8 is an explanatory diagram of the installation distance of the disk, Figure 9 is a front view.
The figure is a comparison table showing the effect on the lubrication layer due to the short installation distance of the disk. 3...Holding member 3a...Sharp portion 4...Disk 12...Protrusion part

Claims (1)

[Claims] A holding member that holds the disk in the vertical direction is provided so as to be immersible in liquid, and the holding member is provided with a protrusion that protrudes downward from the lower end of the disk. A coating device characterized in that a continuous sharp portion is formed that slopes downward toward the top.