JPH02203969A - Coating method for long-sized rod material - Google Patents

Abstract

PURPOSE:To prevent unevenness in thickness of a coated film by overlapping both a supporting plate and a separation plate and temporarily fixing both plates and hanging the rod material group in a freely suspended state for the supporting plate and immersing it in a coating liquid tank. CONSTITUTION:Both a separation plate 18 and a supporting plate 12 are placed on a collar part 20A and glass rods 10 are passed through the hole 14 group respectively. Then head parts 10A having outer diameter larger than the diameter of the hole 14 are formed to the top ends of the glass rods. When the supporting plate 12 is lifted, the glass rod groups 10 are held in a freely suspended state for the supporting plate 12. In this state, various treatments necessary for pretreatment of film formation are performed in accordance with necessity and thereafter a film forming stage starts. In the case of performing film forming treatment, a hanging support part 16 fitted to the supporting plate 12 is hung to the hook of an elevator 45 and sent downward. Thereby the glass rod groups are immersed in coating liquid 30. Thereafter the glass rod groups 10 are pulled up from the inside of coating liquid and dried. Thereby the uniform and excellent films are formed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention is applicable to the invention, for example, when the diameter is several 1 and the length is several tens of centimeters to one centimeter.
The present invention relates to a method that is useful when coating a large number of extremely long and thin rods, each having a length of more than m, by dip coating.

[Conventional technology]

An example of providing a coating on the side circumferential surface of an extremely elongated rod as described above is the manufacturing process of Rondo lenses.

As is well known, a Rondo lens is a lens that has a refractive index distribution that changes parapolitically from the center to the outer periphery in a glass cylinder. A method in which a long glass opening with a diameter of several tens of cm to 1 m or more is subjected to a predetermined process such as ion exchange to impart a refractive index distribution, and in the final stage the glass lot is cut into several eleven predetermined lens lengths. I'm taking it.

In addition to being used as a single lens, the rod lenses described above can be used as optical systems for copying machines, optical printers, etc. by closely arranging a large number of rod lenses in a row with their optical axes parallel and fixing them together to form a lens array. It is used.

In the lens array described above, in order to increase resolution, it is desirable to cut out unnecessary light (flare light) that does not contribute to image formation and is totally reflected on the outer peripheral surface of the light rays incident on the lens. In order to cut this flare light, the peripheral surface of the lens side is made rough by chemical etching, etc., and the flare light is diffused and attenuated by the rough surface, and a light-absorbing material is filled between the lenses. An effective method is to prevent flare light leaking outside from entering an adjacent lens.

However, in the lens array, since the lenses having circular cross sections are in close contact with each other, there remains a problem that some flare light enters into the adjacent lenses through the close contact portions which are not filled with the light-absorbing material.

In order to solve the above-mentioned problem and cut flare light more completely, as shown in FIG. It is extremely effective to form a lens array 4 by arranging the rod lenses 1 on which the coating 3 has been provided in advance.

A coating 3 is applied to a long glass rod that is the base material of the rod lens 1.
When applying this, in consideration of mass production, a large number of glass rods 5 are suspended from one jig 6 as shown in FIG.
A simple method is to immerse this in the coating liquid 7 and then pull it up.

[Problem that the invention seeks to solve]

However, in the above method, if the hole spacing is made small in order to increase the number of ronds suspended in one jig, the ronds themselves may bend when lifted from the coating liquid, the adhesive strength of the coating liquid, etc. As shown in FIG. 4, adjacent glass condos 5 stick to each other, which causes defects such as uneven thickness and partial peeling of the coating film.

On the other hand, it is conceivable to fix the lower end of the glass rod group with some kind of jig so that the legs are separated from each other, but this would require extremely frequent installation work and would cause the bending of the middle part of the glass rod. It is inevitable that sticking will occur.

[Means for solving problems]

In the method of the present invention, each step described below is performed in order.

(al) Prepare a support plate and a separation plate made of a plate material with a number of holes through which the bar material to be processed passes.A hanging holding part is provided on the support plate.A separation plate is placed on the lower surface of the support plate. Align the holes and overlap and temporarily fix both.

(bl) By passing a bar through each of the holes and forming a head with a diameter larger than the diameter of the hole at the upper end of the bar, the group of bars is suspended from the support plate in a freely hanging state.

If necessary, various treatments before film formation are performed in this suspended state.

For example, in the case of a rod lens, the glass rod is subjected to ion exchange treatment, etching treatment, cleaning, etc.

(c) The rod group is immersed in the coating liquid tank in the suspended state, and then the separation plate is removed from the support plate and fixed in the tank near the coating liquid surface.

Td) Continuously raise the bar group upward via the support plate.

(el) At the same time as the bar is pulled up, a heated gas stream is blown from the side toward the circumferential surface of the bar near the top surface of the separation plate, thereby gradually drying the coating film on the circumferential surface of the bar.

The drying in the above step does not need to be complete drying, and it is sufficient that the coatings are dry enough not to leave any marks even if they come into contact with each other.

[For production]

According to the above-described method, the rods pulled up from the coating solution are held at regular intervals by the separation plate, and the coating film is air-dried before they advance a certain distance above the separation plate. Even if the bars are deflected and adjacent bars come into contact with each other, they will no longer stick together, and the coating can be applied to the peripheral surfaces of the bars while they are reliably separated over their entire length.

〔Example〕

In FIG. 1, reference numeral 10 denotes a rod material whose peripheral surface is coated, for example, a glass rod of a Rosotrens mother shrine. Prepare support plate] 2. This support plate 12
A large number of rod insertion holes 14 with a diameter slightly larger than the outer diameter of the processing rod 10 are provided at regular intervals. A support part 16 is fixed.Separately from this support plate 12,
Separation plate 1 with many rod insertion holes 14 like the support plate
Prepare 8. The diameter of the rod insertion hole 14 and the plate outer diameter of the separation plate 18 are made slightly larger than those of the support plate 12. Then, a portion 18 is placed on the lower surface of the support plate 12 with the holes 14 of both aligned, and the two are temporarily fixed by pinching or the like at the periphery.

In suspending the 10 groups of glass rods, a cylindrical container 20 with a depth slightly shorter than the length of the rods 10 is used as shown in FIG. A collar portion 20A is provided, and the separation plate 18 and the support plate 12 are placed on this collar portion 2OA.

Then, the glass lofts 10 are passed through each of the 14 groups of holes. As a result, the glass loft 10 is held upright with its upper end slightly protruding from the support plate 12.

Next, in order to prevent the glass loft 10 from falling off, a head 10A having an outer diameter larger than the diameter of the hole 14 is formed at the upper end of the lot' projecting from the support plate 12.

This drop-off prevention head 10A can be easily produced by force-heating and melting the upper end of the glass rod using a burner or the like.

After the above-mentioned preparation, when the support plate 12 is lifted up, the glass bracket group 12 is attached to the head 1. Due to the hook of the OA, it is held in a freely hanging state on the support plate 12.

In this state, if necessary, the membrane-attached grains are subjected to various pre-treatments, such as ion exchange for forming lenses, etching to make the rice grain surface, and washing, and then the membrane-attached grains are sent to the process.

In this film-forming step, a soaking and cleaning device as shown in FIGS. 2 and 3 is used. The coating liquid 30 is stored in a coating liquid tank 31, and is maintained at a constant temperature by a heater 32 provided at the bottom, and is sucked by a circulation pump 34 through an overflow tank 33, filtered through a filter 35, and then removed from the tank. It is returned within 31.

In addition, the lid member 36 that covers the opening of the coating liquid tank 31 is provided with openings at appropriate intervals to allow the glass loft group to be put in and taken out. A fixture 37 for fixing the separation plate 18 is provided. Further, on the lid member 36, there are provided an air discharge nozzle 3B for blowing hot air horizontally onto the peripheral surface of the glass rod passing through the working opening to dry it, and a suction nozzle 39 for exhausting the discharged air. The pairs are arranged opposite each other with each working opening in between.

Air discharged from the blower 40 is sent to the heater box 4
1 and passes through the duct 42 without blowing out from the discharge nozzle 38 corresponding to each working opening. Note that the amount of air discharged from each nozzle 38 is determined by a damper 43 provided in the middle of the flow path.
It is made uniform by adjusting the opening degree.

In addition, the discharge nozzle 38 has a flat shape so that the discharged hot air does not hit the surface of the coating liquid in the tank, and combines with the suction effect of the suction nozzle 39 to form an air curtain that minimizes vertical diffusion. There is.

Further, a lifting device 45 is installed above the working opening.

In the coating process, the glass loft group is immersed in the coating liquid 30 by hooking the hanging support part 16 attached to the support plate 12 onto the lifting device 450 hook and sending it downward. When the separation plate 18 temporarily fixed to the lower surface of the support plate 12 reaches the 61st and 36th tank lid, the support plate 1
Using the peripheral edge of the separation plate 18 protruding from the outer periphery of the separation plate I8, the separation plate 18 is fixed to the tank by the fixture 37, and the separation plate I8 is released from the temporary fixation to the support plate 12.

Thereafter, the lifting device 45 is raised and the group of 10 glass rods suspended from the support plate 12 is lifted out of the coating liquid.

During this lifting, hot air is discharged from the discharge nozzle 38 to dry the coating film portion of the glass rond that is successively applied above the separation plate 18.

As a result, even if the 10 groups of glass ronds are pulled up for a considerable length and flexed, and the ronds come into contact with each other, no marks are left on the coating film, and a uniform and good coating is formed over the entire glass rond. Can be done.

After the above-mentioned film-coating process is performed, the film is placed in a constant temperature bath in a suspended state, and the temperature is raised to obtain a strong film.

Although the present invention has been explained above by taking the manufacturing process of a rod lens as an example, it goes without saying that the present invention is not limited to the object and can be widely used for coating generally elongated bar materials.

〔Effect of the invention〕

According to the present invention, even when dip coating is performed with a large number of long and thin rods suspended from one jig at close intervals, the paint film does not leave marks due to contact between the rods, and the coating is applied uniformly. Not only can a good coating be formed, but also a large amount of rod material can be coated efficiently within a small area.

[Brief explanation of the drawing]

Figures 1 to 3 show one embodiment of the present invention, Figure 1 is a sectional view showing the steps of attaching a bar to a jig before dipping treatment, and Figure 2 is a schematic diagram showing a dip coating device. 3 is a plan view of the same, FIG. 4 is a side view showing problems with the conventional method, and FIG. 5 shows a rod lens as an example of a rod material to which a coating is applied and a large number of these lenses arranged. FIG. 2 is a diagram showing a lens array configured with 10... Treated bar material, IOA... Fall prevention head, 12
... Support plate, 14... Rod insertion hole, 18... Separation plate, 30... Coating liquid, 31... Coating liquid tank, 32...
Heater 37... Separation plate fixture, 38... Hot air discharge nozzle for drying, 39... Suction nozzle, 40... Blower, 41... Heater box, 42... Duct,
43...Air volume adjustment damper diagram

Claims (1)

[Scope of Claims] A method for coating long and thin rods by dip coating the circumferential surfaces of a large number of long and thin rods, the method comprising the following steps. (a) A step of preparing a support plate and a separating plate made of a plate material with a large number of holes through which rods are passed, and temporarily fixing them by overlapping them with their rod insertion holes aligned (b) Coating treatment on the holes. (c) immersing the bar group in the suspended state in a coating liquid tank;
Thereafter, a step of removing the separation plate from the support plate and fixing it near the coating liquid surface (d) A step of continuously pulling up the bar group upward through the support plate (e) Simultaneously with the above-mentioned lifting, a step of removing the separation plate near the top surface of the separation plate The process of gradually drying the coating film on the circumferential surface of the bar by blowing a stream of heated gas from the side onto the circumferential surface of the bar.