Method for manufacturing light shielding ring

Abstract

To provide a method for manufacturing a light shielding ring by accurately cutting a thin light shielding film.SOLUTION: A method for manufacturing a light-shielding ring used for a camera lens, wherein the light-shielding ring is formed by cutting a light-shielding film by lowering a cutting tool while rotating the cutting tool, an inner peripheral surface and an outer peripheral surface of the light-shielding ring are tapered, and the cutting tool includes an inner peripheral cutting tool for cutting the inner peripheral surface, an outer peripheral cutting tool for cutting the outer peripheral surface, a connecting portion for connecting and integrating the inner peripheral cutting tool and the outer peripheral cutting tool, and a rotation axis provided perpendicular to the connecting portion, the inner peripheral cutting tool has an inclined portion having a cutting edge angle corresponding to the taper of the inner peripheral surface, and the outer peripheral cutting tool has an inclined portion having a cutting edge angle corresponding to the taper of the outer peripheral surface.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a method for manufacturing a light-shielding ring (light-shielding annulus) used in a camera lens, and to a light-shielding ring manufactured by the manufacturing method. [Background technology]

[0002] Conventional camera lenses have light-shielding rings between multiple lenses arranged in layers to prevent unwanted light from entering the lens and improve image quality (Figure 8). Summary of the Invention [Problem to be solved by the invention]

[0003] The light-shielding ring is made by cutting a light-shielding film, but because the light-shielding film is thin, cutting it is difficult. This resulted in variations in the finished products and made it difficult to perform high-precision processing to create a taper on the cutting surface.

[0004] An object of the present invention is to provide a method for manufacturing a light-shielding ring by cutting a thin light-shielding film with high precision, and a light-shielding ring manufactured by the manufacturing method. [Means for solving the problem]

[0005] The present invention, made to achieve the above-mentioned object, is a method for manufacturing a light-shielding ring to be used in a camera lens, wherein the light-shielding ring is formed by lowering a cutting bit while rotating it to cut a light-shielding film, the inner and outer surfaces of the light-shielding ring having tapered edges, the cutting bit having an inner cutting bit that cuts and forms the inner surface, an outer cutting bit that cuts and forms the outer surface, a connecting portion that connects the inner and outer cutting bits to form one piece, and a rotation axis that is arranged perpendicular to the connecting portion, the inner cutting bit having an inclined portion that presents a cutting angle that matches the taper of the inner surface, and the outer cutting bit having an inclined portion that presents a cutting angle that matches the taper of the outer surface. An upper protective tape may be adhered to the upper surface of the light-shielding film, and a lower protective tape may be adhered to the lower surface of the light-shielding film, and when the light-shielding film is cut with the cutting tool, the upper protective tape may also be cut at the same time. The inner peripheral cutting tool may have a rectangular tip portion that protrudes downward from the lower end, and when cutting the light-shielding film, the tip portion may cut the lower protective tape. A recovery tape may be adhered to the lower surface of the lower protective tape. The light-shielding ring used in the camera lens of the present invention is characterized in that the inner and outer peripheral surfaces are tapered. [Effects of the Invention]

[0006] The present invention can achieve at least one of the following effects by solving the above-mentioned problems. (1) By cutting the inner and outer circumferences of the ring simultaneously, even thin light-shielding films can be processed with high precision. (2) By providing a taper to both the bit that cuts the inner circumference and the bit that cuts the outer circumference, the light-shielding film can be pressed down with the bit while cutting, allowing even thin light-shielding films to be processed with high precision. [Brief explanation of the drawings]

[0007] [Figure 1] Light-shielding ring diagram [Figure 2] Diagram of cutting tool [Figure 3] Diagram of inner and outer peripheral bites [Figure 4] Illustration of the processing state of the light shielding ring [Figure 5] Manufacturing method diagram (1) [Figure 6] Manufacturing method diagram (2) [Figure 7] Manufacturing method diagram (3) [Figure 8] Illustration of how the light shielding ring is used DETAILED DESCRIPTION OF THE INVENTION

[0008] The present invention will be described in detail below based on the embodiments shown in the drawings. [Example]

[0009] [Example 1] <1> Light-shielding ring configuration The light blocking ring 1 is a component provided inside the camera lens. The light-shielding ring 1 is made of a light-shielding plastic film and has a thickness of 0.025 to 0.15 mm. The light-shielding ring 1 has a ring-like outer shape consisting of an inner periphery 11 and an outer periphery 12 having a diameter larger than that of the inner periphery 11 (FIG. 1). The inner diameter of the light-shielding ring 1 (diameter of the inner circumference 11) is 57 mm, and the outer diameter (diameter of the outer circumference 12) is 62 mm.

[0010] <2> Inner circumferential surface, outer circumferential surface The inner peripheral surface 11a, which is the surface of the inner periphery 11, and the outer peripheral surface 12a, which is the surface of the outer periphery 12, are tapered from one surface to the other of the light-shielding ring 1. The taper angle of the inner peripheral surface 11a is 55 degrees, and the taper angle of the outer peripheral surface 12a is 8 degrees. By tapering each surface, the light reflected by the inner circumferential surface 11a and the outer circumferential surface 12a of the light-shielding ring 1 is reflected toward the light-receiving side, allowing a clearer image to be captured.

[0011] <3> Cutting Tool The light-shielding ring 1 is manufactured by cutting a light-shielding film with a cutting tool 2. The cutting tool 2 has an inner peripheral tool 21 that cuts and forms the inner circumference 11, an outer peripheral tool 22 that cuts and forms the outer circumference 12, a connecting part 23 that connects the upper ends of the inner peripheral tool 21 and the outer peripheral tool 22 to form one piece, and a rotation axis 24 that is arranged perpendicular to the connecting part 23 (Figure 2).

[0012] <3.1> Inner peripheral tool, outer peripheral tool The inner peripheral cutting tool 21 has a tip 211 and an inclined part 212 that is continuous with the tip 211 and has a cutting edge angle that matches the taper of the inner peripheral surface 11a (FIG. 3(a)). The tip protrudes vertically downward from the end of the inclined part 212, so that the angle of the inner peripheral cutting tool 21 can be maintained. The peripheral cutting tool 22 has a tip portion 221 with a horizontal tip, and an inclined portion 222 that is continuous with the tip portion 221 and has a cutting edge angle that matches the taper of the peripheral surface 12a (FIG. 3(b)). The inner peripheral cutting tool 21 and the outer peripheral cutting tool 22 are attached to both ends of the connecting part 23 with the inner peripheral cutting tool 21 having the inclined part 212 facing outward and the outer peripheral cutting tool 22 having the inclined part 222 facing inward.

[0013] <4> Processing of light-shielding ring The light-shielding ring 1 cuts and processes the light-shielding film by lowering a cutting tool 2, which is made up of an inner peripheral tool 21 and an outer peripheral tool 22, onto the light-shielding film 3 while rotating it around a rotation axis 24 (Figure 4).

[0014] <5> Light-shielding ring manufacturing method (1) Adhesion of protective tape (Figure 5) An upper protective tape 4 is adhered to the upper surface of a light-shielding film 3 constituting the light-shielding ring 1, and a lower protective tape 5 is adhered to the lower surface thereof, with the light-shielding film 3 sandwiched between the upper protective tape 4 and the lower protective tape 5. The upper protective tape 4 and the lower protective tape 5 are made of a PETP-based sheet material, and the sheet material and adhesive method can be selected appropriately, such as acrylic pressure-sensitive adhesive or UV-based adhesive. The thickness of the upper protective tape 4 and the lower protective tape 5 is preferably 0.025 mm or more.

[0015] (2) Adhesion of recovery tape 6 A recovery tape 6 may be further adhered below the lower protective tape 5 . The recovery tape 6 is a PETP-based sheet material, similar to the upper protective tape 4 and the lower protective tape 5, and the sheet material and adhesive method can be selected appropriately, such as acrylic pressure-sensitive adhesive or UV adhesive. The thickness of the recovery tape 6 is preferably 0.025 mm or more.

[0016] (3) Cutting the light-shielding film Of the light-shielding film 3, upper protective tape 4, lower protective tape 5, and recovery tape 6 that have been bonded and polymerized, the light-shielding film 3, upper protective tape 4, and lower protective tape 5 are cut to form the light-shielding film 1. In order to form a tapered inner surface 11a and outer surface 12a of the light-shielding film 1, a cutting tool 2 having a cutting edge angle that matches the taper is used to cut and form the inner surface 11a and outer surface 12a (Figures 6(a) and (b)). As the cutting tool 2 rotates, it lowers the tips 211, 221 of the inner peripheral tool 21 and the outer peripheral tool 22 to a position where they penetrate within a predetermined range from the top surface of the recovery tape 6, cutting the light-shielding film 3 and the bonded upper protective tape 4 and lower protective tape 5. Since the light-shielding film 3 is thin, at 0.025 to 0.15 mm, if it is cut alone it may move and not be able to meet the required dimensions. However, in the present invention, the light-shielding film 3 is fixed by being adhered to the upper protective tape 4 and the lower protective tape 5 which serve as supports, so that even a thin light-shielding film 3 can be processed with high precision. Furthermore, the cutting tool 2 has an inner peripheral tool 21 and an outer peripheral tool 22, and is provided with an inclined portion 212 on the inner peripheral tool 21 and an inclined portion 222 on the outer peripheral tool 22, so that the light-shielding film 3 and the attached upper protective tape 4 can be cut while being pressed down with the respective inclined portions 212, 222, and even a thin, narrow light-shielding film 3 can be processed with high precision. Because the inner peripheral cutting tool 21 has a large taper angle of the inclined portion 212, a tip 211 is provided to protrude in order to maintain the angle of the inner peripheral cutting tool 21, reliably form the taper of the inner peripheral surface 11a, and improve the precision of the product. The tip 211 protrudes downward from the tip 221 of the outer peripheral cutting tool 22, and cuts down to the bottom protective tape 5. For this reason, the bottom protective tape 5 is discontinuous on the inner peripheral side of the light-shielding ring 1 (FIG. 7(a)). The tip 211 may cut off part of the recovery tape 6. On the outer peripheral side of the light-shielding ring, it is sufficient to cut off the light-shielding film 3 (FIG. 7(b)), but it is also possible to cut off part of the bottom protective tape 5 and the recovery tape 6. Thereafter, the recovery tape 6 is peeled off. By using a resin that is cured by ultraviolet light as the material of the recovery tape 6, the recovery tape 6 can be easily peeled off by irradiating the recovery tape 6 with ultraviolet light and curing it. Thereafter, the light-shielding film 3, the upper protective tape 4, and the lower protective tape 5 are removed from the portion other than the light-shielding ring 1 formed by cutting. The upper protective tape 4 and the lower protective tape 5 may be left in place when the light-shielding ring 1 is transported for use in another process or if they are useful for feeding materials in another process. [Explanation of symbols]

[0017] 1 light-shielding ring, 11 inner circumference, 12 outer circumference 2 cutting tool, 21 internal tool, 22 external tool 3...Light-blocking film 4...Upper protective tape 5...Bottom protection tape 6...Recovery tape

Claims

1. A method for manufacturing a light-shielding ring for use in a camera lens, comprising: The light-shielding ring is formed by cutting the light-shielding film by lowering a cutting tool while rotating it. The inner and outer peripheral surfaces of the light-shielding ring are tapered, the cutting tool has an inner peripheral tool that cuts and forms the inner peripheral surface, an outer peripheral tool that cuts and forms the outer peripheral surface, a connecting portion that connects the inner peripheral tool and the outer peripheral tool to form an integral unit, and a rotation axis that is provided perpendicular to the connecting portion, the inner peripheral cutting tool has an inclined portion having a cutting edge angle that matches the taper of the inner peripheral surface, A method for manufacturing a light-shielding ring, characterized in that the outer peripheral cutting tool has an inclined portion with a cutting edge angle that matches the taper of the outer peripheral surface.

2. An upper protective tape is adhered to the upper surface of the light-shielding film, A bottom protective tape is adhered to the bottom surface of the light-shielding film, When cutting the light-shielding film with the cutting tool, the upper protective tape is also cut at the same time. A method for manufacturing the light-shielding ring according to claim 1.

3. The inner peripheral tool has a tip portion that protrudes downward from a lower end in a rectangular shape, When cutting the light-shielding film, the lower protective tape is cut by the tip portion. A method for manufacturing the light-shielding ring according to claim 2.

4. A recovery tape is adhered to the lower surface of the lower protective tape. The method for manufacturing the light-shielding ring according to claim 2 or 3.

5. A light-shielding ring for use with a camera lens, The inner and outer peripheral surfaces are tapered. Blackout ring.

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