Holding jig, coating method for optical element, and manufacturing method for optical lens

Abstract

To provide a holding jig that can hold optical elements of various shapes and sizes, without causing deformation or damage to the optical elements.SOLUTION: A holding jig 1 for holding optical elements comprises: a base 50; first, second and third holding units 12, 22, 32 which hold a peripheral edge portion of a lens base material L; a first arm 10 to which the first holding unit 12 is attached and which is rotatable around the axis of the base 50; a torsion spring 60 that biases the first arm 10 in the first rotational direction such that the first holding unit 12 faces the lens base material L; and an arm fixing mechanism 40 configured to fix the rotation of the first arm 10.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a holding jig, a method for coating an optical element, and a method for manufacturing an optical lens. [Background technology]

[0002] A widely used method for forming a hard coat film, an anti-reflection film, or the like on the substrate of an eyeglass lens is to immerse the lens substrate in a coating liquid for film formation and dry the coating liquid applied to the surface of the lens substrate. When immersing in such a coating liquid, the lens substrate is immersed in the coating liquid while the outer edge of the lens substrate is held by a lens holder. Then, after the lens substrate is pulled out of the coating liquid, it is subjected to a heat treatment while still held by the lens holder, to dry the coating liquid or anneal the coating film.

[0003] As a lens holder for holding a lens substrate, for example, Patent Document 1 discloses a lens holding unit including a lower holding member that contacts the outer periphery of the lens substrate from below, a lateral rotation holding member that is rotatably configured to contact the outer periphery of the lens substrate from one horizontal direction, and a lateral fixed holding member that contacts the outer periphery of the lens substrate from the other horizontal direction. In the lens holding unit described in Patent Document 1, a leaf spring presses the lateral rotation holding member toward the lens substrate. This allows the lateral rotation holding member to contact the outer periphery of the lens substrate even when lens substrates of different sizes and shapes are held by the lens holder. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2012-242832 Summary of the Invention [Problem to be solved by the invention]

[0005] Here, the configuration described in Cited Document 1, in which a spring such as a leaf spring biases the pivotable holding member, has the advantage of being able to hold lens substrates of different sizes and shapes without having to replace the lens holder each time. However, the pressing force applied to the outer periphery of the lens substrate varies depending on the size and shape of the lens substrate. Therefore, in order to stably hold lens substrates of any size and shape, a pressing force of approximately 5 N may be applied to the lens outer periphery. This is because when holding a lens substrate with a large diameter, the leaf spring contracts more, and the force applied to the lens substrate from the lateral pivotable holding member increases.

[0006] On the other hand, in terms of production efficiency, it is advantageous to perform a heat treatment after dip coating while the lens substrate is held in a holder to harden the coating agent and anneal the coating film. For this reason, if a lens substrate with a large diameter or a small thickness is subjected to a heat treatment while held in a lens holder, deformation or damage to the lens substrate may occur.

[0007] The present disclosure has been made in consideration of the above problems, and its purpose is to provide a holding jig that can hold optical elements of various shapes and sizes without causing deformation or damage to the optical elements. [Means for solving the problem]

[0008] A holding jig according to the present disclosure is a holding jig for holding an optical element, A base and At least three holding portions that hold the peripheral edge of the optical element; a first arm to which a first holding portion of the at least three holding portions is attached and which is provided on a base so as to be rotatable about an axis; a biasing member that biases the first arm in a first rotation direction so that the first holding portion faces the optical element; a fixing mechanism configured to fix the rotation of the first arm; The present invention is characterized by comprising:

[0009] Further, a holding jig according to the present disclosure is a holding jig for holding an optical element, At least three holding portions each holding a peripheral portion of a circular or elliptical optical element; a biasing member that biases a first holding portion of the at least three holding portions toward an end of the optical element in a held state; a fixing mechanism that fixes the first holding portion at a position where the first holding portion abuts against an end of the optical element in a held state, and that substantially cancels the biasing force of the biasing member; The present invention is characterized by comprising:

[0010] A film forming method for an optical element according to the present disclosure is a method for forming a film on a surface of an optical element using the holding jig described above, comprising: a step of arranging the optical element so that it is surrounded by at least three holding portions in a state in which the first arms of the holding jig are biased and spread; releasing the biasing force on the first arm and causing the biasing member to abut the first holding portion against the peripheral edge portion of the optical element; a step of fixing the first arm by a fixing mechanism; and a step of immersing the optical element held by the holding jig in a coating liquid; The method includes the steps of: lifting the optical element from the coating liquid; and heating and curing the coating liquid applied to the optical element.

[0011] Further, a method for forming a film on an optical element according to the present disclosure is a method for forming a film on a surface of a circular or elliptical optical element, the method comprising the steps of: At least three holding portions each holding a peripheral portion of the optical element; a biasing member that biases a first holding portion of the at least three holding portions toward an end of the optical element in a held state; A holding jig having a step of holding the optical element by bringing three holding portions into contact with the periphery of the optical element; a step of substantially canceling the biasing force of the biasing member by fixing the first holding portion in a state in which the first holding portion abuts against an end portion of the optical element; immersing the optical element held by the holding jig in a coating liquid; Pulling up the optical element from the coating liquid; a step of heating and curing the coating liquid applied to the optical element; having It is characterized by:

[0012] A method for manufacturing an optical lens according to the present disclosure includes a step of forming a film on a lens substrate by the above-described method for forming a film on an optical element. [Effects of the Invention]

[0013] According to the present invention, a holding jig is provided that can hold optical elements of various shapes and sizes without causing deformation or damage to the optical elements. [Brief explanation of the drawings]

[0014] [Figure 1] FIG. 1 is a front view showing a lens holding jig according to an embodiment of the present disclosure. [Figure 2] FIG. 10 is a rear view showing a lens holding jig according to an embodiment of the present disclosure. [Figure 3] FIG. 1 is a side view illustrating a lens holding jig according to an embodiment of the present disclosure. [Figure 4] 2 is an exploded side view of an arm fixing mechanism of the lens holder shown in FIG. 1. FIG. [Figure 5] FIG. 1 is a front view showing a state in which a lens substrate is held by a holding jig according to an embodiment of the present disclosure. [Figure 6] 1 is a flowchart illustrating a method for manufacturing an optical lens according to an embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0015] A lens holding jig according to an embodiment of the present disclosure will be described in detail below with reference to the drawings. The lens holding jig 1 of this embodiment is for holding an optical element when the optical element is immersed in a treatment liquid to form a functional film on the surface of the optical element by a coating process, as will be described later. Examples of optical elements include lens substrates used in eyeglass lenses.

[0016] 1 to 3 show a lens holding jig according to an embodiment of the present disclosure, with FIG. 1 being a front view, FIG. 2 being a rear view, and FIG. 3 being a side view. Also, FIG. 4 is an exploded side view of a fixing mechanism (hereinafter also referred to as an arm fixing mechanism) of the lens holding jig shown in FIG. 1. As shown in FIGS. 1 to 4, lens holding jig 1 according to this embodiment includes a base 50, a first arm 10, a second arm 20, a third arm 30, an arm fixing mechanism 40, a suspending member 70, a torsion spring 60, and a spring fixing mechanism 80. Unless otherwise specified, each member constituting lens holding jig 1 is made of a heat-resistant metal such as stainless steel.

[0017] The base 50 is made of a plate-like member that is substantially rectangular in front view and has a surface perpendicular to the horizontal plane (extending parallel to the paper surface) when suspended. The base 50 is formed with a through-hole 52 (FIG. 4) that penetrates between the front and back surfaces, and an arc hole 54 that extends in an arc shape centered on the through-hole 52. The through-hole 52 is circular and has a diameter that allows the threaded portion 42A of the butterfly bolt 42 of the arm fixing mechanism 40 to be inserted therethrough. The arc hole 54 is formed over a predetermined angular range diagonally upward relative to the through-hole 52 on the opposite side to the direction in which the first arm 10 extends (to the right in FIG. 1).

[0018] A hanging member 70 is connected to the upper part of the base 50. The hanging member 70 is a rod-shaped member bent into a substantially V-shape. The hanging member 70 includes a horizontal portion 70A, one end of which is attached to the base 50 and extends laterally, and an inclined portion 70B, which is bent in a V-shape relative to the horizontal portion 70A and extends diagonally upward toward the base 50. A ring-shaped annular portion 70C is formed on the base end side of the horizontal portion 70A, and this ring portion is welded to one surface of the base 50. An annular mounting portion 70D is formed at the end of the inclined portion 70B. When the lens substrate is immersed in the coating solution, the lens holding jig 1 is used in a suspended state by attaching the mounting portion 70D to a device that can be driven up and down.

[0019] The first arm 10 has a base end 10A extending laterally and a tip end 10B extending diagonally downward from the tip of the base end 10A. The base end 10A is made of a plate material that is flat in the vertical and horizontal directions (parallel to the plane of the paper in FIG. 1), and a circular through-hole 10C (FIG. 4) with a diameter large enough to receive the threaded portion 42A of the butterfly bolt 42 is formed at the end on the base 50 side. The tip end 10B is made of a straight rod-shaped member, and its base end is connected to the tip of the base end 10A. A first holding portion 12 for holding a lens substrate is provided at the tip of the tip end 10B. The first holding portion 12 is attached so that the base end 12A fits along the surface of the tip end 10B of the first arm 10, and the tip end 12B is bent toward the lens substrate relative to the base end 12A. The edge of the tip of the tip end 12B that comes into contact with the lens substrate is formed into a V-shaped concave shape.

[0020] The second arm 20 is a rod-shaped member and includes a base end 20A attached to the base 50 and a tip end 20B extending downward from the base end 20A. The second arm 20 is attached to the base 50 by welding the upper end of the base end 20A to the base 50. The tip end 20B is inclined toward the lens substrate relative to the base end 20A. A second holding portion 22 for holding the lens substrate is provided at the tip of the tip end 20B. The second holding portion 22 is attached so that the base end 22A is aligned with the surface of the tip end 20B of the second arm 20, and the tip end 22B is bent toward the lens substrate relative to the base end 22A. As shown in FIG. 3, the edge of the tip of the tip end 22B that comes into contact with the lens substrate is formed in a V-shaped concave shape.

[0021] The third arm 30 is a rod-shaped member that is attached to the base 50 and includes a base end 30A extending downward, an intermediate portion 30B extending diagonally downward from the base end 30A toward the first arm 10, and a tip end 30C extending laterally from the intermediate portion 30B. The third arm 30 is attached to the base 50 by welding the upper end of the base end 30A to the base 50. A third holding portion 32 for holding a lens substrate is provided at the tip of the base end 30A. The third holding portion 32 is attached approximately perpendicular to the surface of the base end 30A. The edge of the tip of the third holding portion 32 that comes into contact with the lens substrate is formed into a V-shaped concave shape.

[0022] In this embodiment, the base end 20A of the second arm 20 and the base end 30A of the third arm 30 are connected via the curved portion 24, but this is not limited to this, and the second arm 20 and the third arm 30 may be formed as separate bodies.

[0023] 4, the arm fixing mechanism 40 includes a butterfly bolt 42 as a screw member, a shaft member 44, and a pair of nuts 46A, 46B. The butterfly bolt 42 includes a cylindrical threaded portion 42A having a thread formed on its outer circumferential surface, and a pair of operating wings 42B connected to the threaded portion 42A.

[0024] The shaft member 44 is made of a cylindrical resin member such as plastic. A material that increases the frictional resistance with the first arm 10 when pressed against the first arm 10 is preferred as the material for the shaft member 44. A through-hole 44A is formed through the shaft member 44. The outer diameter of the shaft member 44 is slightly smaller than the inner diameter of the torsion spring 60.

[0025] The arm fixing mechanism 40 is configured by inserting the threaded portion 42A from the front side of the base 50 through the through-hole 52 of the base 50 of the butterfly bolt 42, the torsion spring 60, the through-hole 44A of the shaft member 44, and the through-hole 10C of the first arm 10 in that order, and fastening a pair of nuts 46A, 46B to the tip of the threaded portion 42A from the back side. With this configuration, when the butterfly bolt 42 is not fastened tightly enough, the first arm 10 becomes rotatable relative to the base 50 around the threaded portion 42A of the butterfly bolt 42. Then, by tightening the butterfly bolt 42 to the pair of nuts 46A, 46B, the shaft member 44 is pressed against the surface of the base 50 and the first arm 10, thereby increasing the frictional force between the first arm 10 and the shaft member 44, and the frictional force between the base 50 and the shaft member 44, thereby restricting the rotation of the first arm 10 relative to the base 50 and fixing the first arm 10 to the base 50.

[0026] In this embodiment, the thread formed on the thread portion 42A of the butterfly bolt 42 is a right-handed screw. As a result, the rotation direction in which the butterfly bolt 42 is tightened is the same as the rotation direction in which the first arm 10 is biased by the torsion spring 60. As a result, even if the butterfly bolt 42 is tightened with the first holding portion 12 abutting against the side surface of the lens substrate L, it is possible to prevent the first arm 10 from rotating and separating the first holding portion 12 from the lens substrate L.

[0027] The spring fixing mechanism 80 includes a bolt 82 inserted into the arc hole 54 of the base 50 from the front side, and a nut 84 tightened onto the bolt 82 from the back side. By tightening the nut 84 and the bolt 82, the friction between the bolt 82 and the nut 84 and the base 50 increases, allowing the spring fixing mechanism 80 to be fixed in position. Furthermore, by loosening the tightening of the nut 84 and the bolt 82, the spring fixing mechanism 80 can be moved along the arc hole 54.

[0028] The torsion spring 60 includes a helical portion 62 formed in a spiral shape, and a first arm portion 64 and a second arm portion 66 extending from the end of the helical portion 62. The torsion spring 60 is attached around the shaft member 44 by inserting the shaft member 44 into the inside of the helical portion 62. The tip of the first arm portion 64 is bent in a direction away from the helical portion 62, and the tip of the second arm portion 66 is bent in a direction away from the helical portion 62.

[0029] The tip of the first arm 64 of the torsion spring 60 is hooked onto the upper side of the spring fixing mechanism 80 in the arc hole 54, and the tip of the second arm 66 is hooked onto the upper edge of the first arm 10. The torsion spring 60 is attached in a state in which a pre-twist has been applied between the first arm 64 and the second arm 66. As a result, the torsion spring 60 receives a reaction force from the spring fixing mechanism 80, which urges the first arm 10 so that the first holding portion 12 rotates toward the second arm 20.

[0030] 5 is a front view showing a state in which a lens substrate is held by a holding jig according to an embodiment of the present disclosure. To hold the lens substrate by the holding jig, first, the first arm 10 is pulled sideways and rotated away from the second arm 20. Then, in this state, the lens substrate L is placed between the first holding portion 12, the second holding portion 22, and the third holding portion 32, and the pulling of the first arm 10 is released. 5, the first holding portion 12, the second holding portion 22, and the third holding portion 32 each abut against the side portions of the lens substrate L, and the lens substrate L is held at three points. Next, the butterfly bolt 42 of the arm fixing mechanism 40 is tightened. As a result, the first arm 10 is fixed to the base 50, and the lens substrate L is held in a state where the first holding portion 12, the second holding portion 22, and the third holding portion 32 abut against the side portions of the lens substrate L, with substantially no biasing force acting on the lens substrate L.

[0031] In this case, the positions at which the first holding unit 12 and the second holding unit 22 hold the lens substrate L are preferably such that the height distance from the center of gravity of the lens substrate L is 0.3 times or less the diameter of the lens substrate L (the major axis if the lens substrate L is elliptical). Furthermore, the horizontal distance from the center of gravity of the lens substrate L to the position at which the third holding unit 32 holds the lens substrate L is preferably 0.15 times or less the diameter or major axis R of the lens substrate L in the horizontal direction. By holding the lens substrate L in the above-described manner, the lens substrate L is stably held. Furthermore, when the lens substrate L is pulled up from the coating solution in the process described below, it is possible to prevent uneven film thickness caused by excess coating solution remaining in the lens holding units moving across the optical surface of the lens substrate L due to gravity.

[0032] The biasing force of the torsion spring 60 on the first arm 10 can be adjusted by moving the position of the spring fixing mechanism 80 along the arc-shaped hole 54. That is, the biasing force can be reduced by loosening the bolt 82 and nut 84, moving the spring fixing mechanism 80 downward along the arc-shaped hole 54, and then retightening the bolt 82 and nut 84. The position of the spring fixing mechanism 80 is preferably adjusted in accordance with the size and shape of the lens substrate so that the force with which the first holding part 12 presses against the lens substrate when the lens substrate is attached is approximately 0.1 to 1 N. If the pressing force is too large, a large force is required to attach the lens substrate, and if it is too small, the attachment process becomes less stable, both of which have a negative impact on workability.

[0033] 5 shows a case where the lens substrate is circular, but this is not limiting, and irregularly shaped lens substrates (lens substrates of other shapes, such as oval) can also be held by the holding jig 1. When holding a lens substrate that is not circular, it is advisable to hold it so that the major axis direction (the direction of the maximum dimension of the lens) is vertical. The effects of the present invention are particularly pronounced for plus-prescription lenses, which have a relatively small edge thickness and are prone to deformation and damage near the outer periphery while being held.

[0034] A method for forming a film on a lens substrate using the above-described holding jig and a method for manufacturing an eyeglass lens will be described below. The spectacle lenses to be manufactured can be various lenses, such as single-vision lenses, multifocal lenses, and progressive-power lenses. The type of lens is determined by the surface shapes of both sides of the lens substrate. The surface of the lens substrate may be convex, concave, or flat. In typical lens substrates and spectacle lenses, the object-side surface is convex and the eyeball-side surface is concave. However, the present invention is not limited to these.

[0035] The lens substrate is preferably a plastic lens substrate. Examples of resins used for the plastic lens substrate include styrene resins such as (meth)acrylic resins, polycarbonate resins, allyl resins, allyl carbonate resins such as diethylene glycol bisallyl carbonate resin (CR-39), vinyl resins, polyester resins, polyether resins, urethane resins obtained by reacting an isocyanate compound with a hydroxy compound such as diethylene glycol, thiourethane resins obtained by reacting an isocyanate compound with a polythiol compound, and cured products (generally referred to as transparent resins) obtained by curing a curable composition containing a (thio)epoxy compound having one or more disulfide bonds in the molecule. Furthermore, it can be applied to lens substrates with a refractive index of, for example, about 1.48 to 1.75.

[0036] 6 is a flowchart illustrating a method for manufacturing an optical lens according to an embodiment of the present disclosure. Hereinafter, the formation of a hard coat film on a lens substrate L will be described as an example. The lens substrate, which is the material for optical lenses for spectacles, is cut, polished, and cleaned in advance as a semi-finished lens to form a shape corresponding to the prescription of the user. The lens substrate to which the present invention is applied may be a semi-finished lens. Alternatively, it may be a lens substrate on which optical surfaces facing the eyeball and the object are formed based on the prescription of the user.

[0037] First, the lens substrate L is attached to a holding jig (S20) as shown in Fig. 6. The lens substrate L is attached to the holding jig 1 as follows.

[0038] First, the first arm 10 is pulled and rotated in a direction away from the second arm 20 and the third arm 30, thereby widening the gap between the first holding portion 12 and the second holding portion 22 and the third holding portion 32 (S21).

[0039] Next, with the first arm 10 spaced apart from the second arm 20 and the third arm 30, the lens substrate L is positioned so as to be surrounded by the first holding part 12, the second holding part 22, and the third holding part 32 (S22). If the first arm 10 is biased toward the end of the lens substrate L being held, the first arm is pulled as described above to move the first arm away from the second arm and the third arm against the biasing force.

[0040] Next, the tension on the first arm 10 is released. As a result, the biasing force of the torsion spring 60 causes the first arm 10 to rotate in a direction approaching the second arm 20 and the third arm 30, the first holding part 12 presses the lens substrate L, and the first holding part 12, the second holding part 22, and the third holding part 32 come into contact with the peripheral edge of the lens substrate L (S23).

[0041] Then, the butterfly bolt 42 of the arm fixing mechanism 40 is tightened onto the pair of nuts 46A, 46B. This fixes the first arm 10 to the base 50 (S24). By steps S21 to S24, the lens substrate L can be held by the holding jig 1. In this state, the lens substrate L is stably held so that its optical surface extends substantially vertically, and the biasing force of the torsion spring 60 is not substantially applied to its peripheral edge. In other words, the first holding part is fixed at a position where the first to third holding parts abut against the end of the optical element in the held state, and the biasing force that had been pressing against the lens substrate L is substantially eliminated.

[0042] Next, a hard coat film is formed on the lens substrate (S30). The hard coat film is formed on the lens substrate L as follows.

[0043] First, the holding jig 1 is lowered to immerse the lens substrate L in a coating liquid containing a silicone compound as a main component for forming a hard coat film (S31).

[0044] Next, the holding jig 1 is raised to pull the lens substrate L out of the coating liquid (S32). By pulling the lens substrate L out of the coating liquid in this manner, excess coating liquid is removed from the optical surface of the lens substrate L by gravity.

[0045] Next, the holding jig 1 is subjected to a heat treatment at 80 to 120°C. By subjecting the holding jig 1 to a heat treatment, the coating liquid applied to the surface of the lens substrate L is thermally cured (S33). At this time, according to the holding jig 1 of this embodiment, since an external force (a biasing force for holding the lens) is not substantially applied to the lens substrate L, deformation or damage to the lens substrate L can be prevented.

[0046] Then, immersion in the coating liquid (S31), removal from the coating liquid (S32), and heat curing (S33) are repeated until a hard coat film of a predetermined thickness is formed on the optical surface of the lens substrate L. By repeating S31 to S33, a hard coat film can be formed. Note that S31 to S33 may be repeated as necessary to form a hard coat film of a predetermined thickness.

[0047] Incidentally, before forming a hard coat film on the lens substrate (S30), a primer layer may first be formed on the surface of the lens substrate. The primer layer is intended to ensure impact resistance of the lens substrate and to ensure adhesion between the hard coat film and the lens substrate. When the lens substrate is made of a relatively high refractive index material, the primer layer may be made of a material that does not affect the optical properties. Such a primer layer can be formed by applying the primer by a dipping method, spin coating method, spraying method, or the like, followed by curing by heating, light irradiation, or the like.

[0048] Next, an anti-reflection film is formed on the surface of the hard coat film (S40). The anti-reflection film can be formed by, for example, vacuum deposition, dipping, spin coating, or the like. Through the above steps, eyeglass lenses can be manufactured.

[0049] According to this embodiment, the following effects are achieved. According to this embodiment, the first holding part 12 is attached to the first arm 10, which is rotatably provided on the base, and therefore lens substrates of different sizes and shapes can be held by rotating the first arm 10. After the lens substrate is positioned in a fixed position by the first to third holding parts, the rotation of the first arm 10 is fixed by tightening the wing bolt 42 that constitutes the arm fixing mechanism 40 with the nuts 46A and 46B, and the lens substrate L is stably held without being subjected to external forces. Therefore, even when the lens substrate L is subjected to heat treatment such as heat curing of a coating material, deformation or damage to the lens substrate L due to external forces can be prevented.

[0050] Furthermore, according to this embodiment, the position of the spring fixing mechanism 80 that fixes the first arm 64 of the torsion spring 60 can be moved along the arc hole 54. As a result, even when holding lens substrates L of different sizes or shapes, by changing the position of the spring fixing mechanism 80, the biasing force applied to the first arm from the torsion spring 60 can be adjusted, and deformation and damage to the lens substrate L can be prevented.

[0051] Furthermore, according to this embodiment, the arm fixing mechanism 40 fixes the rotation of the first arm 10 by tightening the wing bolt 42 with the nuts 46A and 46B, and sandwiching the first arm 10 between the wing bolt 42 and the nuts 46A and 46B via the shaft member 44. This allows the operator performing the film formation process on the lens substrate L to easily and quickly fix and release the first arm.

[0052] Furthermore, in this embodiment, the rotation direction in which the butterfly bolt 42 is tightened is the same direction in which the first arm 10 is biased by the torsion spring 60. Therefore, when the butterfly bolt 42 is tightened, the first arm 10 rotates, and it is possible to prevent the first holding part 12 from moving away from the side surface of the lens substrate L.

[0053] In this embodiment, a case where a hard coat film is formed on the surface of the lens substrate L has been described, but the present invention is not limited to this. Other examples include a blue light blocking film that reduces glare and improves visibility and contrast by blocking light rays in the blue region (wavelength range of 380 to 500 nm), an anti-reflection film containing, for example, silicon oxide, titanium dioxide, zirconium oxide, or tantalum oxide, and a water-repellent film that improves water repellency using an organosilicon compound having fluorine atoms. Furthermore, the lens holding jig 1 of this embodiment can prevent deformation and damage to the lens substrate L even when the lens substrate L is subjected to an annealing treatment.

[0054] In the above embodiment, the lens substrate L is held by the first holding portion 12, the second holding portion 22, and the third holding portion 32, but the lens may be held by four or more holding portions. Furthermore, in this embodiment, the second holding portion 22 and the third holding portion 32 are fixed, but they may also be movable.

[0055] In this embodiment, the second holding unit 22 and the third holding unit 32 are attached to the second arm 20 and the third arm 30. This allows the second holding unit 22 and / or the third holding unit 32 to be flexibly held, and the force acting on the lens substrate L can be reduced.

[0056] In addition, in this embodiment, a butterfly bolt 42 is used for the arm fixing mechanism 40, but this is not limiting, and a thumb bolt or knob bolt may also be used. It is preferable to apply a mechanism that allows an operator to tighten and release easily and efficiently without using an additional jig. [Explanation of symbols]

[0057] 1: Lens holding jig 10: First arm 10A: Proximal end 10B:Tip 10C: Through hole 12: First holding part 12A: Proximal end 12B:Tip 20: Second arm 20A: Proximal end 20B:Tip 22: Second holding part 22A: Proximal end 22B:Tip 24: Curved section 30: Third arm 30A: Proximal end 30B: Middle part 30C:Tip 32: Third holding part 40: Arm fixing mechanism 42: Wing bolt 42A: Thread part 42B: Control blade 44: Shaft member 44A: Through hole 46A: Nut 46B: Nut 50: Base 52: Through hole 54: Arc hole 60: Torsion spring 62: Spiral part 64: First arm 66: Second arm 70: Hanging member 70A: Lateral section 70B: Inclined part 70C: Annular section 70D: Mounting part 80: Spring fixing mechanism 82: Bolt 84: Nut

Claims

1. A holding jig for holding an optical element, A base and At least three holding portions for holding a peripheral portion of the optical element; a first arm to which a first holding portion of the at least three holding portions is attached and which is provided on the base so as to be rotatable about an axis; a biasing member that biases the first arm in a first rotation direction so that the first holding portion faces the optical element; a fixing mechanism configured to fix the rotation of the first arm; Equipped with A holding jig characterized by:

2. the biasing member is a torsion spring mounted to apply a biasing force between the base and the first arm; A fixed position of the torsion spring on the base is variable in a circumferential direction around the axis. The holding jig according to claim 1 .

3. The fixing mechanism includes: A threaded member and a nut that is screwed into the threaded member, the first arm is clamped by fastening the threaded member and the nut, thereby fixing the rotation of the first arm; The holding jig according to claim 1 or 2.

4. A rotation direction for tightening the threaded member is the same as the first rotation direction. The holding jig according to claim 3 .

5. The holding jig includes three holding portions, A second holding portion and a third holding portion of the three holding portions are attached to a second arm and a third arm fixed to the base, respectively. The holding jig according to any one of claims 1 to 4.

6. A holding jig for holding an optical element, At least three holding portions each holding a peripheral portion of a circular or elliptical optical element; a biasing member that biases a first holding portion of the at least three holding portions toward an end portion of the optical element in a held state; a fixing mechanism for fixing the first holding portion at a position where the first holding portion abuts against an end portion of the optical element in a held state and substantially canceling the biasing force of the biasing member; A holding jig characterized by:

7. A method for forming a film on a surface of an optical element by using the holding jig according to any one of claims 1 to 5, comprising the steps of: a step of positioning the optical element so that the optical element is surrounded by the at least three holding portions in a state in which the first arms of the holding jig are biased and spread apart; releasing the biasing force on the first arm and causing the first holding portion to abut against a peripheral portion of the optical element by the biasing member; fixing the first arm by the fixing mechanism; immersing the optical element held by the holding jig in a coating liquid; lifting the optical element from the coating liquid; a step of heating and curing the coating liquid applied to the optical element; A method for forming a film on an optical element, comprising the steps of:

8. A method for depositing a coating on a surface of a circular or elliptical optical element, comprising the steps of: At least three holding portions each holding a peripheral portion of the optical element; a biasing member that biases a first holding portion of the at least three holding portions toward an end portion of the optical element in a held state; Using a holding jig having a step of holding the optical element by bringing the three holding portions into contact with a peripheral edge of the optical element, respectively; a step of substantially canceling the biasing force of the biasing member by fixing the first holding portion in a state in which the first holding portion abuts against an end portion of the optical element; immersing the optical element held by the holding jig in a coating liquid; lifting the optical element from the coating liquid; a step of heating and curing the coating liquid applied to the optical element; having 1. A method for forming a film on an optical element comprising the steps of:

9. 9. The method for forming a film on an optical element according to claim 8, wherein in the holding step, the three holding portions are brought into contact with a peripheral edge of the optical element against the biasing force.

10. A method for producing an optical lens, comprising the step of forming a film on a lens substrate by the method for forming a film for an optical element according to any one of claims 7 to 9.

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