JP2000189884A - Coating method - Google Patents

Abstract

(57) [Problem] To provide a method for forming a coating film capable of forming a uniform coating film and preventing formation of a coating film on an unnecessary portion. First, a jig (5) is mounted so as to surround an outer peripheral portion of a lens (1). The jig 5 is preferably made of an elastic material, and its front surface 51 and back surface are respectively continuous with the first surface 3 and the second surface, which are the coating film forming surfaces of the lens 1. With the jig 5 mounted on the lens 1, these are supported by the support 7 and immersed in the coating liquid 8. Next, the lens 1 and the jig 5 are pulled up from the coating liquid 8, and the applied coating liquid is cured by, for example, ultraviolet irradiation to form a coating film. Thereafter, the jig 5 is removed from the lens 1. A uniform coating film is formed on the first surface 3 and the second surface of the lens 1,
No coating film is formed on the edge portion 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a coating film on a surface of an object to be coated such as a lens.

[0002]

2. Description of the Related Art A hard coat layer (coating film) is formed on the surface of various lenses in order to prevent scratches.
Conventionally, this hard coat layer is formed as follows.

[0005] As shown in FIG. 5, the lens 10 is immersed in a coating liquid 80 while the lens 10 is supported by a lifting support 15, pulled up from the coating liquid 80, and the adhered coating liquid 80 is removed. Cured to form a coating on the lens surface.

However, according to this method, as shown in FIG. 6, a coating film 13 is also formed on the edge portion (outer peripheral portion) 11 of the lens 10 which does not originally need to form a coating film. When pulled out of the liquid 80, the edge 11 and the outer edge 12 of the effective area of the lens 10 are caused by liquid dripping (movement of the liquid downward) due to gravity, surface tension of the liquid, and the like.
The rise of the coating film in the vicinity (a coating film thicker than the designed film thickness) 14
Occurs.

[0005] When the coating film 13 and the swelling 14 of the coating film 13 are formed on the edge portion 11 of the lens 10, the outer diameter (length and width) of the lens 10 increases by the film thickness, and the lens 10 can be mounted on a lens holder or the like. It can be difficult.

The outer edge 12 of the effective area of the lens 10
If such a swelling 14 of the coating film is formed in the vicinity, the effective area of the lens 10 has a shape different from the originally designed shape, and the optical characteristics of the lens 10 may be impaired.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for forming a coating film capable of forming a uniform coating film and preventing the formation of a coating film on an unnecessary portion. It is in.

[0008]

This and other objects are achieved by the present invention which is defined below as (1) to (10).

(1) A method of forming a coating film on an object to be coated, wherein a jig having a surface continuous with the surface of the object to be coated with a coating film is mounted on the object. A method for forming a coating film, comprising forming a coating film.

(2) The method according to (1), wherein the object to be coated is an optical component, and the jig is mounted so as to surround an outer peripheral portion of the optical component.

(3) The method according to (2), wherein the optical component is a lens.

(4) The method for forming a coating film according to (3), wherein the jig has surfaces continuous with both surfaces of the lens.

(5) The method according to any one of the above (2) to (4), wherein the coating is a hard coat layer.

(6) The method according to any one of (1) to (5) above, wherein the jig is made of an elastic material.

(7) The method for forming a coating film according to any one of the above (1) to (6), wherein the formation of the coating film is performed by a dipping method.

(8) The lifting speed from the coating solution is 1
The method for forming a coating film according to the above (7), wherein the coating rate is 0 to 1000 mm / min.

(9) The method for forming a coating film according to any one of the above (1) to (8), wherein the viscosity of the coating solution used for forming the coating film is 1 to 1000 cps (25 ° C.).

(10) The method for forming a coating film according to any one of the above (1) to (9), wherein the temperature of the coating solution used for forming the coating film is 5 to 40 ° C.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a method for forming a coating film according to the present invention will be described in detail with reference to the preferred embodiments shown in the accompanying drawings.

In the present invention, the object on which the coating film is formed is not particularly limited. For example, various lenses, prisms, mirrors, beam splitters, various optical parts such as optical filters, polarizing plates, window members, wristwatches, etc. And the like. In the following embodiments, a case where a lens is used as an object to be coated will be described as an example.

FIG. 1 is a front view showing an embodiment of a coating film forming method of the present invention, FIG. 2 is a sectional view taken along the line AA in FIG.
FIG. 4 is a cross-sectional side view showing a shape of a coating film in a state in which a jig is mounted on an object (lens) to be coated, and FIG. 4 is a diagram showing a shape of the coating film in a state in which the jig is removed from the object (lens). It is sectional side view shown.

As shown in FIGS. 1 and 2, in the present invention, first, a jig 5 is attached to the lens 1 before forming a coating film.

The jig 5 is a frame-shaped member having an opening 6 into which the lens 1 can be fitted. Jig 5
The constituent material is not particularly limited, but is preferably an elastic material. Examples of the elastic material include various rubbers such as natural rubber, isoprene rubber, styrene-butadiene rubber, urethane rubber (polyurethane), acrylic rubber, silicone rubber, fluorine-based rubber, chloroprene rubber, nitrile rubber, polyurethane-based, and polyester-based rubbers. And various thermoplastic elastomers such as polyamides. Of these, silicone rubber, fluorine-based rubber, and chloroprene rubber are particularly preferred as those inert to the coating liquid 8.

When the jig 5 is made of such an elastic material, the jig 5 can be deformed when the jig 5 is mounted. Therefore, the mounting work on the lens 1 can be easily performed, and the edge portion 2 of the lens 1 can be formed. Adhesion to the edge portion 2 is high, and the intrusion of the coating liquid 8 into the edge portion 2 can be effectively prevented.

When the jig 5 is made of an elastic material, the size of the opening 6 is preferably set slightly smaller than the outer shape of the lens 1. Thereby, the jig 5
Is mounted so as to tighten the edge portion 2 of the lens 1 by its elastic force, and it is possible to effectively prevent the application liquid 8 from entering the edge portion 2.

The coating film 9 is formed on both surfaces (the first surface 3 and the second surface 4) of the lens 1;
In the state where the jig 5 is attached to the
Respectively constitute surfaces that are continuous with both surfaces of the lens 1 (the first surface 3 and the second surface 4: the surface on which the coating film is formed), that is, continuous surfaces having substantially no steps (see FIG. 2).

The jig 5 is mounted so as to surround the entire outer periphery of the lens 1.

In this manner, with the jigs 5 attached to the lens 1, they are supported by the supports (supports for pulling up) 7, and a coating liquid (immersion liquid) 8 containing the components of the coating film 9 is provided. Soak in.

The coating liquid 8 is not particularly limited, and includes, for example, a coating liquid for forming a hard coat layer, an antireflection film, a reflection increasing film, a protective layer, a conductive layer, a colored layer, and the like.

In the case of a coating solution for forming a hard coat layer, its main components differ depending on the constituent materials of the lens 1 and the like.
For example, in the case of a polymethyl methacrylate (PMMA) lens, an acrylic hard coat liquid (containing silica)
Is preferably used.

Further, the coating liquid 8 may contain various curing agents such as an ultraviolet curing agent.

The coating liquid 8 may contain various additives. Examples of the additive include a filler such as silica.

The viscosity of the coating liquid 8 is not particularly limited, but is preferably about 1 to 1000 cps (25 ° C.).
It is more preferably about 1 to 100 cps (25 ° C.). If the viscosity is too high, the formed coating film 9 tends to be uneven.

The temperature of the coating liquid 8 is not particularly limited, but is preferably about 5 to 40 ° C., preferably 15 to 25 ° C.
It is more preferable that the temperature is about ° C. If the temperature is too high, it is difficult to handle, and if the temperature is too low, it is difficult to handle because of the influence of water.

Next, the lens 1 and the jig 5 are pulled out of the coating liquid 8. The speed of pulling up from the coating liquid 8 is not particularly limited, but is preferably about 10 to 1000 mm / min, and more preferably about 150 to 350 mm / min. If the lifting speed is too fast, the uniformity of the formed coating film is reduced, and if the lifting speed is too slow,
Productivity decreases.

When the lens 1 and the jig 5 are pulled out of the coating liquid 8, the liquid moves downward by gravity, and the thickness of the coating film 9 becomes thicker at the lower part of the jig 5, and the bulge 91 is formed. (See FIG. 3). However, since this portion is removed together with the jig 5, the coating 9 formed on both surfaces of the lens 1 has a uniform thickness.

Next, the coating liquid 8 adhered to the surfaces of the lens 1 and the jig 5 is cured. Thereby, the coating film 9 is formed (see FIG. 3).

The method for curing the coating film is appropriately determined according to the type and composition of the coating solution. For example, a method of drying a wet coating film, a method of heating and curing the coating film,
A method of irradiating the coating film with light such as ultraviolet rays, an electron beam, radiation, or the like can be used.

When the curing of the coating film 9 is completed, the jig 5 is removed from the lens 1 (see FIG. 4). Thereby, the lens 1
A uniform and uniform coating film 9 is formed on the first surface 3 and the second surface 4. In this case, no coating film is formed on the edge portion 2 of the lens 1.

According to the method for forming a coating film as described above, a uniform and uniform coating film 9 is formed on the first surface 3 and the second surface 4 of the lens 1.
Is formed, it is possible to prevent the optical characteristics of the lens 1 from changing due to a change in the shape of the effective area of the lens 1.

Further, since the coating film is not formed on the edge portion 2, the outer shape of the lens 1 can be maintained as it is, and the outer diameter of the lens 1 does not increase by the thickness, so that the lens support portion such as a lens holder can be used. Installation can be performed properly and reliably as designed.

The type of the lens 1 is not particularly limited. For example, a lens constituting a photographic optical system of a camera or a video camera, a lens constituting a finder optical system, a telescope, binoculars, a microscope, a projector (projector) ), Lenses used in copiers and laser printers, small lenses used in optical pickups (optical heads of optical disks and magneto-optical disks), small lenses used in endoscopes, etc., lenses used in various optical devices and optical measurement devices , Eyeglass lenses and the like.

The material of the lens 1 is not particularly limited.
Any material such as various glass materials and various plastic materials may be used.

In the above, the dipping method (dipping)
However, the present invention is not limited to this, and may be applied to a method of forming a coating film by, for example, spin coating, spray coating, roll coating, brush coating, or the like. Can be.

[0045]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the present invention will be described.

Example 1 A lens for a camera finder having the shape shown in FIGS. 1 and 2 was prepared. This lens was a biconvex lens having a length of 10.54 mm and a width of 16.02 mm, and the material of the lens was polymethyl methacrylate.

On the other hand, a two-component curable silicone rubber (KE1206, manufactured by Shin-Etsu Silicone Co., Ltd.) was poured into a mold and cured to produce a jig having the shape shown in FIGS. The dimensions of the opening of this jig are 10.3 mm long x 1 mm wide.
It was 5.8 mm.

Next, the lens was fitted into the opening of the jig. The first surface of the lens and the front of the jig, and the second surface of the lens and the back of the jig each constituted a continuous surface. Also, the inner surface of the opening of the jig was in close contact with the edge (outer peripheral surface) of the lens.

Next, the lens provided with the jig was immersed in a coating solution for forming a hard coat layer while being supported by a support (pulling-up tool). The conditions of the coating liquid are as follows.

Composition of coating solution: Acrylic UV-curable coating solution containing colloidal silica Viscosity of coating solution: 5.16 cps (25 ° C.) Temperature of coating solution: 20 ° C. Immersion time: 20 seconds After immersion in coating solution The jig and the lens were lifted into the air at a lifting speed of 190 mm / min.

Next, the entire jig and lens that were lifted were irradiated with ultraviolet rays (total irradiation intensity of 85 mJ / c).
m ² ), the applied coating liquid was cured. As a result, a coating film (hard coat layer) was formed.

Finally, the jig was removed from the lens. Observation of the state of coating film formation and analysis using a stylus-type shape evaluation device (Form Talysurf) revealed that a uniform and uniform hard coat layer was formed on both surfaces (first and second surfaces) of the lens. Was formed. The average thickness of this hard coat layer was 5.4 μm.

Example 2 The viscosity of the coating solution was 3.67 cp.
s (25 ° C.), the temperature of the coating solution was set to 20 ° C., and the pulling speed from the coating solution was set to 240 mm / min, to form a coating film (hard coat layer) in the same manner as in Example 1.

The jig was removed from the lens and the state of formation of the coating film was examined in the same manner as in Example 1. As a result, a uniform and uniform hard coat layer was formed on both surfaces (the first surface and the second surface) of the lens. Had been formed. The average thickness of this hard coat layer was 2.8 μm.

Example 3 The viscosity of the coating solution was 3.67 cp.
s (25 ° C.), the temperature of the coating solution was set to 20 ° C., and the pulling speed from the coating solution was set to 320 mm / min, to form a coating film (hard coat layer) in the same manner as in Example 1.

The jig was removed from the lens, and the state of coating film formation was examined in the same manner as in Example 1. As a result, a uniform and uniform hard coat layer was formed on both surfaces (the first surface and the second surface) of the lens. Had been formed. The average thickness of this hard coat layer was 3.5 μm.

[0057]

As described above, according to the method for forming a coating film of the present invention, a uniform coating film, particularly, a coating film having a uniform thickness can be formed at necessary places.

Further, when a coating film is formed on an optical component such as a lens, it is possible to prevent the optical characteristics from being changed (inhibited) by unevenness in the thickness of the coating film, and to support or mount a lens holder or the like. It can be properly and reliably attached to the part.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of a coating film forming method of the present invention.

FIG. 2 is a sectional view taken along line AA in FIG.

FIG. 3 is a cross-sectional side view showing a shape of a coating film in a state where a jig is mounted on an object to be coated (lens).

FIG. 4 is a cross-sectional side view showing a shape of a coating film in a state where a jig is removed from an object to be coated (lens).

FIG. 5 is a front view showing a conventional method for forming a coating film.

FIG. 6 is an enlarged view showing a state of a coating film formed by a conventional method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 lens 2 edge part 3 1st surface 4 2nd surface 5 jig 51 front 52 back 6 opening 7 support tool 8,80 coating liquid 9 coating 91 swelling 10 lens 11 edge 12 outer rim 13 coating 14 swelling 15 support Ingredient

Claims (10)

[Claims] 1. A method of forming a coating film on an object to be coated, comprising: attaching a jig having a surface continuous with a film forming surface of the object to be applied to the object; A method for forming a coating film, comprising forming a film. 2. The method according to claim 1, wherein the object to be coated is an optical component, and the jig is mounted so as to surround an outer peripheral portion of the optical component. 3. The optical component according to claim 2, wherein the optical component is a lens.
3. The method for forming a coating film according to item 1. 4. The method for forming a coating film according to claim 3, wherein the jig has surfaces that are respectively continuous with both surfaces of the lens. 5. The method according to claim 2, wherein the coating is a hard coat layer. 6. The method according to claim 1, wherein the jig is made of an elastic material. 7. The method for forming a coating film according to claim 1, wherein the formation of the coating film is performed by a dipping method. 8. A lifting speed from 10 to 1 in the coating solution.
The method for forming a coating film according to claim 7, wherein the coating speed is 000 mm / min. 9. The viscosity of a coating solution used for forming a coating film is 1 to 9.
The method for forming a coating film according to claim 1, wherein the temperature is 1000 cps (25 ° C.). 10. The temperature of a coating solution used for forming a coating film is 5
The method for forming a coating film according to any one of claims 1 to 9, wherein the temperature is from 40 to 40 ° C.