Lens positioning mechanism, lens manufacturing apparatus, and method for manufacturing lens components

Abstract

The present invention provides a technique capable of easily and highly accurately positioning a lens member having a convex optical surface. The present invention is configured as a lens positioning mechanism, including: a member holding portion (50) that holds the second surface of a lens member having a first surface and a second surface, and has a function of applying a force to the held lens member toward the first surface side, the first surface being a convex optical surface and the second surface being an optical surface facing the first surface; an attitude control portion (60) that restricts edge positions at multiple locations on the first surface of the lens member to which a force is applied by the member holding portion (50), and positions the lens member in a specified attitude.

Description

Technical Field

[0001] The present invention relates to a lens positioning mechanism, a lens manufacturing apparatus, and a method for manufacturing lens components. Background Art

[0002] In recent years, there have been spectacle lenses in which a film (such as a SnO2 film or a Cr film) on an optical surface of a lens substrate has been patterned with a prescribed pattern (for example, see Patent Document 1).

[0003] Prior Art Documents

[0004] Patent Documents

[0005] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2018-180168

[0006] Problems to be Solved by the Invention

[0007] In order to perform patterning of a lens with high precision, positioning of the optical surface as the surface to be processed is essential. However, in the case where the optical surface is a convex curved surface, it is not easy to perform positioning of the optical surface with high precision. Summary of the Invention

[0008] An object of the present invention is to provide a technique capable of easily and highly precisely positioning a lens component having a convex optical surface.

[0009] Means for Solving the Problems

[0010] The present invention is proposed to achieve the above object.

[0011] A first aspect of the present invention is as follows:

[0012] A lens positioning mechanism, comprising:

[0013] a component holding portion that holds the second surface of a lens component having a first surface and a second surface, and has a function of applying a force to the held lens component toward the first surface side, the first surface being a convex optical surface, and the second surface being an optical surface facing the first surface; and

[0014] an attitude control portion that restricts edge positions at multiple locations on the first surface of the lens component to which the force is applied by the component holding portion, and positions the lens component in a prescribed attitude.

[0015] A second aspect of the present invention is as follows:

[0016] The lens positioning mechanism according to the first aspect, wherein

[0017] the attitude control portion is configured to restrict the edge positions by a tapered portion that widens in the force application direction to the lens component.

[0018] The third aspect of the present invention is as follows:

[0019] The lens positioning mechanism according to the second aspect, wherein

[0020] the attitude control unit has a plurality of support claws respectively corresponding to the plurality of locations,

[0021] the tapered portions are respectively provided on the plurality of support claws.

[0022] The fourth aspect of the present invention is as follows:

[0023] The lens positioning mechanism according to the third aspect, wherein

[0024] the attitude control unit has a claw driving unit that moves the plurality of support claws to switch between a clamped state and a non-clamped state of the lens member.

[0025] The fifth aspect of the present invention is as follows:

[0026] The lens positioning mechanism according to any one of the first to fourth aspects, wherein

[0027] the member holding unit has:

[0028] a gasket portion that holds the second surface of the lens member by vacuum adsorption; and

[0029] a joint portion that is configured to support the gasket portion so as to be freely swingable and can switch between a movable state and a fixed state of the swinging portion.

[0030] The sixth aspect of the present invention is as follows:

[0031] The lens positioning mechanism according to any one of the first to fifth aspects, wherein

[0032] the member holding unit has an elastic member that expands and contracts along the force application direction of the lens member.

[0033] The seventh aspect of the present invention is as follows:

[0034] The lens positioning mechanism according to the sixth aspect, wherein

[0035] the member holding unit has a brake portion that maintains the bent state of the elastic member.

[0036] The eighth aspect of the present invention is as follows:

[0037] The lens positioning mechanism according to any one of the first to seventh aspects, which has:

[0038] A sensor unit that detects the relative position of a specified point on the first surface of the lens member with respect to a restricted position when positioned by the attitude control unit.

[0039] A ninth aspect of the present invention is as follows:

[0040] The lens positioning mechanism according to any one of the first to eighth aspects, wherein

[0041] The lens member is an ophthalmic lens.

[0042] A tenth aspect of the present invention is as follows:

[0043] A lens manufacturing apparatus having:

[0044] The lens positioning mechanism according to any one of the first to ninth aspects; and

[0045] A member processing unit that performs a specified process on the first surface of the lens member positioned in a specified attitude by the lens positioning mechanism.

[0046] An eleventh aspect of the present invention is as follows:

[0047] A method for manufacturing a lens member, having:

[0048] A step of applying a force to a lens member having a first surface and a second surface toward the first surface side, where the first surface is a convex optical surface and the second surface is an optical surface facing the first surface;

[0049] A step of restricting edge positions at multiple locations on the first surface of the lens member to which the force is applied to position the lens member in a specified attitude; and

[0050] A step of performing a specified process on the first surface of the lens member positioned in the specified attitude.

[0051] Advantages of the Invention

[0052] According to the present invention, it is possible to easily and highly accurately position a lens member having a convex optical surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 It is a plan view showing a structural example of an ophthalmic lens according to an embodiment of the present invention.

[0054] Figure 2 It is a cross-sectional view showing a structural example of an ophthalmic lens according to an embodiment of the present invention.

[0055] Figure 3 It is a flowchart showing an example of a manufacturing step of an ophthalmic lens according to an embodiment of the present invention.

[0056] Figure 4 This is an explanatory diagram showing an example of an eyeglass lens as an object to be processed in one embodiment of the present invention.

[0057] Figure 5 This is a top view of a schematic structural example showing a specific example of a lens positioning mechanism according to one embodiment of the present invention.

[0058] Figure 6 This is an explanatory diagram (one of them) schematically showing an outline of a step (process) of a lens positioning method according to one embodiment of the present invention.

[0059] Figure 7 This is an explanatory diagram (the second one) schematically showing an outline of a step (process) of a lens positioning method according to one embodiment of the present invention.

[0060] Figure 8 This is an explanatory diagram (the third one) schematically showing an outline of a step (process) of a lens positioning method according to one embodiment of the present invention.

[0061] Figure 9 This is an explanatory diagram (the fourth one) schematically showing an outline of a step (process) of a lens positioning method according to one embodiment of the present invention.

[0062] Figure 10 This is a side sectional view of a main part structural example showing another specific example of a lens positioning mechanism according to one embodiment of the present invention.

[0063] Figure 11 This is a partial enlarged view showing a specific example of a pattern portion of an eyeglass lens according to one embodiment of the present invention. Figure 11 In (a), it is a diagram showing the microscopic observation result of the pattern portion according to this embodiment. Figure 11 In (b), it is a diagram showing the microscopic observation result of the pattern portion obtained by an inkjet recording method as a comparative example. Detailed Embodiment

[0064] Next, embodiments of the present invention will be described with reference to the drawings.

[0065] (1) Schematic Structure of Eyeglass Lens

[0066] First, as the lens to be processed in this embodiment, the schematic structure will be described by taking an eyeglass lens as an example.

[0067] Figure 1 This is a top view of a structural example of the eyeglass lens exemplified in this embodiment. Figure 2 This is its sectional view.

[0068] (Overall Structure)

[0069] The spectacle lens 10 has a surface on the object side and a surface on the eyeball side as optical surfaces. The "surface on the object side" refers to the surface on the object side when the wearer wears the spectacle with the spectacle lens 10. On the contrary, the "surface on the eyeball side" refers to the surface on the eyeball side when the wearer wears the spectacle with the spectacle lens 10. The surface on the object side is a convex surface, and the surface on the eyeball side is a concave surface. That is to say, the spectacle lens 10 is generally a meniscus lens.

[0070] Hereinafter, the surface on the object side of the spectacle lens 10 will be referred to as the "first surface", and the surface on the eyeball side will be referred to as the "second surface".

[0071] In this case, the spectacle lens 10 is configured to have a first surface and a second surface, the first surface being a convex optical surface, and the second surface being an optical surface facing the first surface.

[0072] As Figure 1 shown, on at least one of the first surface and the second surface of the spectacle lens 10 in the present embodiment, a plurality of minute dots 21 are evenly arranged at equal intervals, and a predetermined pattern is formed by these dots 21. Although an example of forming a predetermined pattern on the entire surface of the spectacle lens 10 is shown in the present embodiment, the predetermined pattern may also be formed locally. In addition, the predetermined pattern may not be composed of a plurality of minute dots 21, and may be composed of, for example, characters or graphics.

[0073] The plurality of dots 21 constituting the predetermined pattern are each formed in the same shape (for example, circular). The fact that these dots 21 are "evenly arranged at equal intervals" means that the intervals between adjacent dots 21 are arranged at a fixed pitch P.

[0074] As Figure 2 shown, the spectacle lens 10 having such a predetermined pattern is configured to have: a lens substrate 11 as an optical substrate, a hard coat film (HC film) 12 formed on both sides thereof (that is, one side of each of the first surface and the second surface), a patterned film 13 formed on the HC film 12 on one surface side (specifically, the first surface side), and an antireflection film (AR film) 14 formed on both sides. Here, although the case where the patterned film 13 is disposed on the first surface side is exemplified, it is not limited thereto, and the patterned film 13 may be disposed on at least one surface. In addition, in the spectacle lens 10, other films may be formed in addition to the HC film 12, the patterned film 13, and the AR film 14.

[0075] (Lens substrate)

[0076] The lens substrate 11 is made of a general resin material for optical lenses and is formed into a predetermined lens shape. The predetermined lens shape may be configured as any one of a single-focus lens, a multi-focus lens, a progressive refractive power lens, and the like.

[0077] The resin material constituting the lens substrate 11 is, for example, a resin material having a refractive index (nD) of about 1.50 to 1.74. Examples of such resin materials include allyl diglycol carbonate, polyurethane resins, polycarbonate, thiourethane resins, and episulfide resins. In addition, the lens substrate 11 may not be composed of the above-mentioned resin materials, but may be composed of other resin materials that can obtain a desired refractive index, or may be composed of inorganic glass.

[0078] (HC film)

[0079] The HC film 12 is, for example, a film formed of a curable material containing a silicon compound and having a thickness of about 3 μm to 4 μm. The refractive index (nD) of the HC film 12 is similar to that of the material of the lens substrate 11, for example, about 1.49 to 1.74, and the film structure is selected according to the material of the lens substrate 11. By coating with such a HC film 12, the durability of the eyeglass lens 10 is improved.

[0080] (Patterned Film)

[0081] The patterned film 13 is formed on the optical surface of the lens substrate 11 via the film 12, and is composed of, for example, a film with a thickness of several nm to several tens of nm. As a material constituting the patterned film 13, for example, a metal or metal oxide having the laser absorption property described later is used. In other words, the patterned film 13 is a metal oxide film or a metal film having laser absorption properties. As such a film, for example, a film containing at least one metal or metal oxide selected from chromium (Cr), tantalum (Ta), niobium (Nb), titanium (Ti), zirconium (Zr), gold (Au), silver (Ag), tin (Sn) and aluminum (Al), preferably a tin dioxide (SnO2) film or a Cr film. In the following description, the case where the patterned film 13 is a SnO2 film or a Cr film is mainly used as an example.

[0082] The patterned film 13 has a pattern portion 20 formed by partially removing the film. The pattern portion 20 forms the above-mentioned predetermined pattern. Specifically, the pattern portion 20 is configured by arranging a plurality of identically shaped portions 21. The identically shaped portions 21 are formed by partially removing the film and correspond to the above-mentioned dots 21.

[0083] That is, in the present embodiment, the pattern portion 20 constitutes a dot pattern, the dot pattern is a predetermined pattern, and the portions 21 of the same shape constitute the dots 21 of the dot pattern.

[0084] (AR film)

[0085] The AR film 14 has a multilayer structure of films with different refractive indices, and prevents light reflection by interference. However, it does not necessarily have to be a multilayer structure, and may be a single-layer structure as long as the effect of preventing light reflection can be obtained.

[0086] In the case where the AR film 14 is a multilayer structure of a low refractive index layer and a high refractive index layer, the low refractive index film is composed of, for example, silicon dioxide (SiO2) having a refractive index of about 1.43 to 1.47. In addition, the high refractive index film is composed of a material having a higher refractive index than the low refractive index film, and is composed of metal oxides such as niobium pentoxide (Nb2O5), tantalum pentoxide (Ta2O5), titanium dioxide (TiO2), zirconium dioxide (ZrO2), yttrium trioxide (Y2O3) and aluminum oxide (Al2O3) in an appropriate proportion.

[0087] By coating with such an AR film 14 , it is possible to improve the visibility of the image transmitted through the spectacle lens 10 .

[0088] (Basic manufacturing steps)

[0089] The spectacle lens 10 having the above-mentioned structure is manufactured through the steps described below.

[0090] Figure 3 This is a flowchart showing an example of a manufacturing process of the eyeglass lens according to the present embodiment.

[0091] When manufacturing the eyeglass lens 10 , first, as a first step, a lens substrate 11 as an optical substrate is prepared (step 101 , hereinafter “step” is abbreviated as “S”).

[0092] After the lens substrate 11 is prepared, a second step is performed to form the HC film 12 on both surfaces of the lens substrate 11 (S102). The HC film 12 can be formed by, for example, a dipping method using a solution in which a curable material containing a silicon compound is dissolved.

[0093] After the HC film 12 is formed, as a third step, a step (S103) of forming a thin film 13a of a SnO2 film or a Cr film as a patterned thin film 13 is performed on the optical surface of the lens substrate 11 via the HC film 12. Specifically, a thin film 13a of a SnO2 film or a Cr film is formed on the convex side of the first surface on the HC film 12. The thin film 13a can be formed by, for example, vacuum evaporation or sputtering.

[0094] After forming the thin film 13a, next, as the fourth process, a process of partially removing the thin film 13a to form the pattern portion 20 is performed (S104). That is, the thin film 13a is patterned by partially removing it. When patterning the thin film 13a, a patterned thin film 13 having the pattern portion 20 is formed on the HC film 12 on the convex surface side.

[0095] As a patterning method, for example, a method of forming a resist pattern on an optical surface by an inkjet recording method and patterning using the resist pattern is known. However, since the optical surface of the spectacle lens 10 has a curved surface shape, when forming a resist pattern by an inkjet recording method, it is impossible to correctly form a resist pattern on the optical surface, and as a result, high-precision patterning may not be possible. Here, in the present embodiment, patterning for obtaining a specified pattern (that is, the pattern portion 20) is performed by laser processing using laser irradiation. Specifically, when forming the pattern portion 20, only the portion of the thin film 13a to be removed is selectively irradiated with laser, and the thin film 13a is partially removed by the energy of the laser.

[0096] If patterning is performed using such laser irradiation, high-precision patterning can be achieved. Moreover, since the thin film 13a is directly patterned by using laser, formation and removal of a resist pattern can be omitted.

[0097] Then, after forming the patterned thin film 13, as the fifth process, a cleaning process for removing residues, attached substances (foreign substances), etc. during patterning is performed (S105).

[0098] Thereafter, as the sixth process, a process of forming the AR film 14 on the convex surface side as the first surface and the concave surface side as the second surface is performed (S106). When the AR film 14 has a multilayer structure, a low refractive index layer and a high refractive index layer are alternately laminated from the lower layer side. This film formation can be performed, for example, by ion-assisted evaporation.

[0099] (2) Inventor's insight

[0100] As described above, when manufacturing the spectacle lens 10, the thin film 13a on the convex surface side is patterned by laser processing using laser irradiation. It is preferable to perform such patterning with high precision. For high-precision patterning, an effective method is to irradiate the surface to be processed with a laser processing machine capable of three-dimensionally controlling the focal position of the laser.

[0101] As a laser processing machine, a laser processing machine is used which has a laser oscillator that oscillates a laser, a laser optical system that converges and irradiates the laser from the laser oscillator, and a lens holding unit that holds the workpiece (the lens substrate 11 after forming the HC film 12 and the thin film 13a in the present embodiment) irradiated with the laser. A laser processing machine in which the laser oscillator and the laser optical system are integrally formed into a laser head may also be used. In a laser processing machine having such a structure, "able to three-dimensionally control the focal position of the laser" means that the focal position of the laser irradiated on the workpiece can be changed not only in the XY directions in the plane along the irradiated surface but also in the Z direction along the optical axis direction of the laser, and the manner of the change can be controlled by at least one of the movement of the relative position between the laser optical system and the workpiece or the optical path adjustment performed by the laser optical system.

[0102] In the case where such three-dimensional control can be performed, the positioning of the optical surface as the processed surface is indispensable. However, in the case of the spectacle lens 10, the optical surface as the patterned processed surface has a curved surface shape. In particular, in the present embodiment, the first surface (the surface on the object side), which is a convex curved surface, is patterned by laser irradiation. Moreover, the curvature (bending) of the first surface varies depending on the lens. Therefore, when the optical surface is a convex curved surface, it is not necessarily easy to perform the positioning of the optical surface with high precision. Hereinafter, specific examples will be given to explain the reasons.

[0103] Figure 4 It is an explanatory diagram showing an example of the spectacle lens as the workpiece in the present embodiment.

[0104] The legend shows the case where the spectacle lens 10 is a prism lens. A prism lens is a spectacle lens 10 to which a prism is added. In the case of a prism lens, the lens substrate 11 is configured such that the first surface (the surface on the object side) is a convex curved surface and the second surface (the surface on the eyeball side) is a concave curved surface, and the first surface and the second surface face each other with a prism amount.

[0105] For example, as shown in (a) of Figure 4 the positioning of the spectacle lens 10 can be considered to be based on the edge (end edge) position of the second surface of the lens substrate 11. Specifically, the lens substrate 11 is placed on a smooth surface with the second surface side facing downward, so that the positioning is performed with the edge position of the second surface, which is a concave curved surface, as a reference and the edge position is arranged along a horizontal line.

[0106] However, in the case where the spectacle lens 10 is a prism lens, when the positioning is performed based on the edge position of the second surface, as shown in Figure 4As shown in (b), the first surface, which is the patterned surface to be processed, is arranged to be inclined by a prism amount with respect to the surface orthogonal to the laser irradiation direction (the orthogonal surface in the figure). In such a configuration state, it is impossible to accurately position the first surface, which is the surface to be processed, and thus it is difficult to precisely perform three-dimensional control of the focal position of the laser. In addition, although data correction considering the prism amount can be performed for precise three-dimensional control, in this case, the processing becomes complicated for precise control.

[0107] That is, in order to suppress the complication of the processing and at the same time achieve high-precision patterning of the optical surface, as Figure 4 shown in (c), it is preferable to perform positioning based on the convex first surface, which is the patterned surface to be processed. In a state where the edge position of the first surface is arranged along the surface orthogonal to the laser irradiation direction (the orthogonal surface in the figure), patterning is performed by irradiating the first surface with the laser. Moreover, regardless of whether the spectacle lens 10 is a prism lens or the curvature (bending) of the first surface of the spectacle lens 10, it is preferable to perform positioning based on the first surface easily and with high precision.

[0108] In view of the above, the inventors of the present application have repeatedly conducted in-depth research, and as a result, a lens positioning mechanism described below has been proposed.

[0109] (3) A specific example of the lens positioning mechanism

[0110] Next, a specific example of the lens positioning mechanism according to the present embodiment will be described.

[0111] Figure 5 is a top view showing a schematic structural example of a specific example of the lens positioning mechanism according to the present embodiment.

[0112] (Overall structure)

[0113] The lens positioning mechanism of the present embodiment is arranged in parallel with the laser processing machine 30 and is generally configured to include a lens mounting table 40, a member holding portion 50, an attitude control portion 60, a sensor portion 70, and a control portion (not shown).

[0114] (Lens mounting table)

[0115] The lens mounting table 40 is a table for mounting the spectacle lens 10 which is the object to be patterned by the laser processing machine 30, and is configured to have a smooth plane (i.e., the lens mounting surface) for mounting the second surface of the spectacle lens 10. In addition, in the present embodiment, the object to be processed actually refers to the lens substrate 11 after the HC film 12 and the thin film 13a are formed, but in the following description, for simplicity of explanation, the object to be processed is simply referred to as the spectacle lens 10. The spectacle lens 10 mounted on the lens mounting table 40 is clamped by the support claws 61 of the attitude control unit 60 as described later. Therefore, a notch 41 is formed in the lens mounting table 40 to avoid interference of the support claws 61 of the attitude control unit 60. In addition, the lens mounting table 40 is configured to be able to raise and lower the lens mounting surface.

[0116] (Component holding part)

[0117] The component holding part 50 is configured to hold the second surface of the spectacle lens 10 which is the object to be processed. For this purpose, the component holding part 50 has: a gasket part 51 which holds the second surface of the spectacle lens 10 by vacuum adsorption; a joint part 52 which supports the gasket part 51 so as to be able to swing freely. Moreover, the joint part 52 is configured to be able to switch the movable state and the fixed state of the swinging part. The state conversion is realized, for example, by the presence or absence of vacuum adsorption, and a mechanism for switching between the fixed state in which the swinging part is locked as needed and the state in which the swinging part is not fixed and can move freely is used. If the gasket part 51 is supported via such a joint part 52, the gasket part 51 can follow the shape of the second surface of the spectacle lens 10 in the movable state. In addition, the attitude of the spectacle lens 10 held by the gasket part 51 can be maintained in the fixed state.

[0118] In addition, the component holding part 50 has a function of applying a force to the held spectacle lens 10 from the second surface side to the first surface side in addition to the function of holding the spectacle lens 10. Therefore, the component holding part 50 has: a sliding mechanism part 53 which moves the gasket part 51 and the joint part 52 in the force application direction; an elastic member 54 which expands and contracts in the force application direction. In the illustrated example, the elastic member 54 is a compression coil spring. With such a structure, when an external force is applied to the component holding part 50 from the first surface side to the second surface side of the held spectacle lens 10, the elastic member 54 bends, and when the external force is reduced or released, the reaction force of the elastic member 54 applies a force to the held spectacle lens 10 from the second surface side to the first surface side.

[0119] In addition, the component holding part 50 has a brake part 55 for maintaining the bent state of the elastic member 54. The brake part 55 can be constituted by an electromagnetic brake, for example. With such a structure, regardless of the magnitude of the reaction force of the elastic member 54, the component holding part 50 can stop the movement of the sliding mechanism part 53 at an arbitrary position and maintain its stopped state.

[0120] Furthermore, the component holding portion 50 includes: a first electric actuator portion 56 that integrally moves the gasket portion 51, the joint portion 52, the sliding mechanism portion 53, and the elastic member 54 in the direction along the force application direction of the spectacle lens 10 (refer to arrow A in the figure); a second electric actuator portion 57 that integrally moves the gasket portion 51, the joint portion 52, the sliding mechanism portion 53, and the elastic member 54 in the direction orthogonal to this direction (refer to arrow B in the figure). That is, the component holding portion 50 functions as an orthogonal biaxial robotic arm that moves the spectacle lens 10 held by the gasket portion 51.

[0121] In addition, the component holding portion 50 is configured to hold the spectacle lens 10 in a state of standing upright in the vertical direction. The state of standing upright in the vertical direction means a state in which the optical surface of the spectacle lens 10 is arranged along the vertical direction, and in particular, in the present embodiment, it means a state in which the edge position of the first surface of the spectacle lens 10 is arranged along the vertical direction.

[0122] (Attitude control portion)

[0123] The attitude control portion 60 is used to position the spectacle lens 10 in a specified attitude. The specified attitude is, for example, the attitude after positioning based on the first surface of the spectacle lens 10, and in particular, in the present embodiment, it is the attitude after positioning in a state where the edge position of the first surface of the spectacle lens 10 is arranged along the vertical direction.

[0124] In order to position in the specified attitude, the attitude control portion 60 is configured to restrict the edge positions at multiple places on the first surface of the spectacle lens 10 that is applied with force by the component holding portion 50. More specifically, the attitude control portion 60 has a plurality of (i.e., three or more, for example, four) pin-shaped support claws 61 arranged in a manner corresponding to the multiple places, and each support claw 61 is provided with a tapered portion 62. The tapered portion 62 is formed to widen toward the force application direction of the spectacle lens 10. Then, by the edge position of the first surface of the spectacle lens 10 coming into contact with the tapered portion 62 arranged on one end side of the support claw 61, it is configured to restrict the movement of this edge position in the force application direction. In addition, the attitude control of the spectacle lens 10 by the attitude control portion 60 will be described in detail later.

[0125] In addition, the attitude control portion 60 is configured to have a claw driving portion 63, and the claw driving portion 63 moves the plurality of support claws 61 in the direction orthogonal to the pin axis direction (refer to arrow C in the figure), and switches the clamping state and the non-clamping state of each support claw 61 with respect to the spectacle lens 10. The claw driving portion 63 can be constituted by, for example, an electric actuator. By moving each support claw 61 by the claw driving portion 63 and clamping the spectacle lens 10, the attitude control portion 60 can lift and move the spectacle lens 10 placed on the lens placement table 40.

[0126] Furthermore, the attitude control unit 60 has a claw rotation unit 64 that moves the support claw 61, the tapered portion 62, and the claw drive unit 63 integrally in the direction of rotation (arrow D in the figure). The claw drive unit 64 is the same as the claw drive unit 63 and can also be constituted by, for example, an electric actuator. By moving the support claw 61 and the like through the claw drive unit 64, it is possible to switch the spectacle lens 10 held by the support claw 61 between a state of being horizontally set on the lens placement table 40 and a state of being erected in the vertical direction.

[0127] (Sensor unit)

[0128] The sensor unit 70 measures the relative position of a specified point on the first surface of the spectacle lens 10 with respect to the limit position when the attitude control unit 60 is positioned. As the specified point on the first surface, for example, the vertex position of the first surface as a convex curved surface can be cited. In order to measure the position of such a specified point, the sensor unit 70 has a contact member 71 that abuts against the specified point and a moving mechanism 72 that moves the position of the contact member 71. And it is configured to measure the relative position of the specified point (for example, the vertex position of the first surface) with respect to the limit position (i.e., the first surface edge position) of the spectacle lens 10 by the attitude control unit 60 by identifying the position of the contact member 71 when it abuts against the specified point. In addition, as long as the sensor unit 70 can measure the position of the first surface of the spectacle lens 10, it may not be a contact type mechanism as in this embodiment, and may be a non-contact type component such as a laser range finder.

[0129] (Control unit)

[0130] The control unit executes the operation control of the above-mentioned units 40 to 70. Specifically, the control unit is configured to control the lifting and lowering operation of the lens placement surface of the lens placement table 40, the vacuum adsorption operation of the component holding unit 50, the operations of the first electric actuator unit 56, the second electric actuator unit 57, and the brake unit 55, and the operations of the claw drive unit 63 and the claw rotation unit 64 of the attitude control unit 60. In addition, the control unit is configured to obtain the measurement result of the sensor unit 70, perform data processing on the measurement result as needed, and notify the laser processing machine 30 of the data processing result.

[0131] Such a control unit can be constituted by, for example, a computer device that executes a specified program.

[0132] (4) Steps of the lens positioning method

[0133] Next, the steps of the method for positioning a lens using the above-described lens positioning mechanism will be described. In addition, the processing operations of each unit described below are controlled by the control unit.

[0134] Figures 6 - 9It is an explanatory diagram schematically showing an outline of a step (process) of the lens positioning method according to the present embodiment.

[0135] At the time of lens positioning, first, as Figure 6 shown, the spectacle lens 10 as an object to be processed is placed on the lens placement surface of the lens placement table 40 with the second surface side of the spectacle lens 10 facing downward. It is possible to consider using a transfer robot arm to place the spectacle lens 10, but it can also be done by an operator holding it by hand. Then, after being placed on the lens placement surface, the claw driving unit 63 of the attitude control unit 60 moves each support claw 61 (refer to the arrow C in the figure), and the end edge of the spectacle lens 10 is clamped by each support claw 61. At this time, since the notch portion 41 is formed in the lens placement table 40, each support claw 61 does not interfere with the lens placement table 40.

[0136] In addition, for example, when the claw driving unit 63 is constituted by an electric actuator and the claw driving unit 63 has a function of recognizing the positions of the respective support claws 61, it is possible to measure the diameter of the held spectacle lens 10 by clamping the end edge of the spectacle lens 10 with each support claw 61.

[0137] After the spectacle lens 10 is clamped by each support claw 61, then the lens placement surface of the lens placement table 40 is retracted by lowering, and as Figure 7 shown, while maintaining the state where each support claw 61 clamps the spectacle lens 10, the claw rotation unit 64 of the attitude control unit 60 is operated (refer to the arrow D in the figure). Thereby, the spectacle lens 10 is clamped by each support claw 61 in a state of being erected in the vertical direction.

[0138] Then, as Figure 8 shown, the first electric actuator unit 56 of the member holding unit 50 is operated so that the gasket unit 51, the joint unit 52, the sliding mechanism unit 53, and the elastic member 54 are integrally moved in such a manner that the gasket unit 51 abuts against the second surface of the spectacle lens 10 (refer to the arrow A1 in the figure). After the gasket unit 51 abuts against the second surface of the spectacle lens 10, when the first electric actuator unit 56 is further operated, the sliding mechanism unit 53 operates so as to bend the elastic member 54. Thereby, even when the gasket unit 51 abuts against the second surface of the spectacle lens 10, it is not necessary to more precisely control the moving stroke of the first electric actuator unit 56, and an excessive load is not applied to the spectacle lens 10.

[0139] In addition, at this time, since the gasket unit 51 abutting against the second surface of the spectacle lens 10 is supported via the joint unit 52, if the joint unit 52 is in a movable state, the gasket unit 51 can follow the shape of the second surface of the spectacle lens 10.

[0140] After the gasket portion 51 abuts against the second surface of the spectacle lens 10 and the elastic member 54 is in a bent state, the spectacle lens 10 is temporarily held by vacuum suction of the gasket portion 51 (i.e., vacuum suction is performed but the gasket portion 51 is in a state where it can swing), and the claw drive portion 63 moves each support claw 61 so that the intervals between the support claws 61 that sandwich the spectacle lens 10 are opened only by a certain amount (for example, about 0.05 mm to 0.1 mm). In this way, since the clamping force of each support claw 61 is weak, as Figure 9 shown, in the state where the spectacle lens 10 is temporarily held by the gasket portion 51, due to the reaction force generated by the elastic member 54 about to elongate, the spectacle lens 10 is urged from the second surface side to the first surface side and moves toward the first surface side in a manner guided by each support claw 61 (refer to arrow A2 in the figure). Then, when the edge position of the first surface of the spectacle lens 10 reaches the tapered portion 62, it abuts against the tapered portion 62, and the spectacle lens 10 no longer moves. That is to say, in the spectacle lens 10, the edge positions at multiple places on the first surface (i.e., the positions clamped by multiple support claws 61) are restricted by the tapered portion 62 of the attitude control portion 60.

[0141] After the edge position of the first surface is restricted by the tapered portion 62, the claw drive portion 63 moves each support claw 61 in a direction to narrow the intervals between the support claws 61. In this way, in the state where the edge positions at multiple places on the first surface (i.e., the positions clamped by multiple support claws 61) are located at the junction of the support claws 61 and the tapered portion 62, the spectacle lens 10 is clamped by each support claw 61. That is to say, the spectacle lens 10 is positioned with the first surface as a reference in such a way that the edge position of the first surface is located at the junction of the support claws 61 and the tapered portion 62. At this time, the temporary holding of the spectacle lens 10 by the gasket portion 51 is released.

[0142] Here, the sensor portion 70 measures the relative position of a specified point (for example, the vertex position of the first surface) on the first surface of the spectacle lens 10 with respect to the limiting position when the attitude control portion 60 is positioned. Specifically, the moving mechanism 72 moves the position of the contact member 71 until the contact member 71 abuts against the first surface of the spectacle lens 10, and identifies the position of the contact member 71 when it abuts against the first surface (specifically, the amount of movement to reach the abutting position). At this time, for the sensor portion 70, the distance value to the junction position of the support claws 61 and the tapered portion 62 of the attitude control portion 60 (i.e., the edge position of the first surface of the spectacle lens 10) is a known fixed value. Therefore, if the abutting position of the contact member 71 is known, the amount by which the vertex position of the first surface protrudes with respect to the edge position of the first surface can be determined.

[0143] Thus, for the first surface of the spectacle lens 10, the sensor unit 70 can determine the amount of protrusion of the vertex position. In addition, as described above, the claw drive unit 63 of the attitude control unit 60 can measure the diameter of the held spectacle lens 10. Therefore, for example, when the first surface of the spectacle lens 10 is spherical, the control unit can identify the three-dimensional shape data of the surface shape constituting the first surface of the positioned spectacle lens 10 based on the notification information from the attitude control unit 60 and the sensor unit 70. As described later, for example, the identified surface shape data is sent from the control unit to the laser processing machine 30 and is used by the laser processing machine 30.

[0144] Then, the second surface of the positioned spectacle lens 10 is vacuum-sucked by the gasket unit 51, and the joint unit 52 supporting the gasket unit 51 is changed to a fixed state. Further, the brake unit 55 stops the movement of the sliding mechanism unit 53 so as to maintain the bent state of the elastic member 54. Thus, the spectacle lens 10 is held by the holding unit 50 while maintaining the attitude after positioning with the first surface as a reference.

[0145] When the member holding unit 50 holds the spectacle lens 10, the attitude control unit 60 moves each support claw 61 in the direction of widening the interval between the support claws 61 through the claw drive unit 63 to release the clamping of the spectacle lens 10 by each support claw 61. Even when the clamping is released, the spectacle lens 10 maintains the attitude after positioning with the first surface as a reference by the holding of the member holding unit 50.

[0146] Then, while holding the spectacle lens 10, the member holding unit 50 operates the first electric actuator unit 56 to move the spectacle lens 10 in a direction away from the attitude control unit 60, and operates the second electric actuator unit 57 to move to a position where the laser processing machine 30 can perform laser processing on the spectacle lens 10. Even when moved to a position where laser processing can be performed, the spectacle lens 10 maintains the attitude after positioning with the first surface as a reference by the holding of the member holding unit 50. Moreover, since the bent state of the elastic member 54 is maintained by the brake unit 55, for the spectacle lens 10 to move to a position where laser processing can be performed, no complex processing is required, and it can be easily and appropriately controlled. That is, even when the restriction of the tapered portion 62 is released, since the elastic member 54 maintains the bent state, no complex position correction processing is required to reflect the elongation amount of the elastic member 54, and only by controlling the operations of the first electric actuator unit 56 and the second electric actuator unit 57, the spectacle lens 10 can be moved to a desired position with high precision.

[0147] When moving to a position where laser processing can be performed, as described in detail later, while maintaining the posture after positioning based on the first surface, the spectacle lens 10 is subjected to laser processing using a laser processing machine 30 based on the three-dimensional shape data of the identified first surface. That is, the laser processing machine 30 has a function as a member processing unit for performing laser processing, and performs a prescribed process on the first surface of the spectacle lens 10 positioned in a prescribed posture by the lens positioning mechanism according to the present embodiment.

[0148] (5) Other specific examples of the lens positioning mechanism

[0149] One specific example of the above-described lens positioning mechanism assumes that the outer shape of the spectacle lens is circular. However, among spectacle lenses as objects to be processed, in addition to spectacle lenses with a circular outer shape, there are also so-called spectacle lenses after spherical processing. In addition, in order to thin the lens, add a prism, etc., there are also spectacle lenses that have undergone cutting processing, polishing processing, etc. As represented by the spherical processed spectacle lens, hereinafter, a spectacle lens that has undergone at least one of cutting processing or polishing processing will be referred to as a "non-standard lens".

[0150] In a non-standard lens, for example, due to the influence of cutting processing, polishing processing, etc., there may be a position where the edge portion becomes sharp. Therefore, it is not necessarily appropriate to perform positioning based on the edge position of the first surface of the non-standard lens. Therefore, when the spectacle lens as the object to be processed is a non-standard lens, for a lens positioning mechanism that can perform appropriate positioning, hereinafter, another specific example different from the above-described one specific example will be described. In addition, in the following description, mainly only the points different from the above-described one specific example will be described.

[0151] In another specific example described herein, the structures of the member holding unit 50 and the attitude control unit 60 are different from those in the above-described one specific example.

[0152] Figure 10 It is a side cross-sectional view showing a main part structure example of another specific example of the lens positioning mechanism according to the present embodiment.

[0153] (Member holding unit)

[0154] The member holding unit 50 is configured to hold the non-standard lens 10a via an auxiliary tool 80 assembled on the second surface of the non-standard lens 10a as the object to be processed.

[0155] The auxiliary tool 80 can use, for example, a workpiece jig used in the cutting process, polishing process, etc. of spectacle lenses. The workpiece jig is assembled on the concave surface (i.e., the second surface) of the spectacle lens by the bonding action of a low-melting-point metal member called an alloy. However, a jig other than the workpiece jig can also be used as the auxiliary tool 80.

[0156] Similar to the case of the above specific example, it is possible to consider holding the shaped lens 10a via the auxiliary tool 80 by using the vacuum adsorption of the gasket portion 51. In this case, the gasket portion 51 vacuum-adsorbs the auxiliary tool 80 instead of the shaped lens 10a. However, it is not necessarily limited to this. For example, the auxiliary tool 80 can also be held by a mechanical clamping operation. In either case, the conversion of whether the joint portion 52 can be shaken can be performed.

[0157] (Attitude control unit)

[0158] The attitude control unit 60 is configured to limit a fixed position on the surface of the first surface of the shaped lens 10a by abutting against it, thereby positioning the shaped lens 10a in a specified attitude. When the object to be processed is the shaped lens 10a, due to the influence of, for example, cutting processing, polishing processing, etc., there may be a position where the edge portion becomes sharp. It is not necessarily appropriate to perform positioning based on the edge position. Therefore, the attitude control unit 60 does not perform positioning based on the edge position of the first surface, but performs positioning based on a specified position on the surface of the first surface.

[0159] As the specified position serving as the reference, for example, a circular region on the surface of the first surface of the shaped lens 10a centered on the vertex position of the first surface of the shaped lens 10a can be cited. In this case, the attitude control unit 60 is configured to abut against the circular region on the surface of the first surface of the shaped lens 10a to perform position limitation. Specifically, a circular limiting member 65 formed of a material that is difficult to leave scratches and contact marks, such as silicone, fluororesin members, etc., replaces the cone portion 62 described in the above specific example. By abutting this limiting member 65 against the surface of the first surface of the shaped lens 10a, the position of the first surface of the shaped lens 10a is limited. Thereby, the shaped lens 10a is positioned in a specified attitude. The specified attitude is the same as that in the above specific example, which means the attitude after positioning with the first surface as the reference, and particularly means the attitude in which the edge position of the first surface in the present embodiment is positioned in a state of being arranged in the vertical direction.

[0160] In addition, the specified position serving as the reference does not necessarily have to be a circular region. For example, it can also be three or more points separated from each other on the surface of the first surface of the shaped lens 10a centered on the vertex position of the first surface of the shaped lens 10a. In this case, the attitude control unit 60 is configured to abut against three or more points separated from each other on the surface of the first surface of the shaped lens 10a to perform position limitation. Even with such a structure, the shaped lens 10a can be positioned in a specified attitude.

[0161] (Steps of lens positioning)

[0162] In the lens positioning mechanism having the above structure, the steps of positioning the lens are the same as those in the above specific example. Therefore, the description thereof is omitted here.

[0163] (6) Effects produced by the lens positioning mechanism according to the present embodiment

[0164] According to the lens positioning mechanism of the present embodiment, whether it is the above specific example or another specific example, the following effects can be obtained.

[0165] In the present embodiment, with the first surface being a convex curved surface as a reference, the spectacle lens 10 or the special-shaped lens 10a as the object to be processed is positioned. Then, regardless of whether the spectacle lens 10 or the special-shaped lens 10a is a prism lens, and regardless of the curvature (bending) of the first surface of the spectacle lens 10 or the special-shaped lens 10a, it is possible to easily and highly accurately position with the first surface as a reference.

[0166] That is to say, according to the present embodiment, it is possible to easily and highly accurately position the spectacle lens 10 or the special-shaped lens 10a having a convex optical surface.

[0167] (7) Details of laser processing

[0168] Next, a specific example is given to describe in detail the laser processing performed by the laser processing machine 30 on the spectacle lens 10 or the special-shaped lens 10a.

[0169] When the laser processing machine 30 performs laser processing, first, before that, as described above, the spectacle lens 10 or the special-shaped lens 10a (hereinafter collectively referred to as "lens member") is positioned in a predetermined posture by the lens positioning mechanism. Then, in a state where the lens member is positioned in a predetermined posture, the control unit uses the size measurement result of the first surface of the lens member obtained by the sensor unit 70 to identify the surface shape data of the first surface of the lens member. Then, with the lens member maintained in the positioned posture, the first electric actuator unit 56 and the second electric actuator unit 57 move the lens member until the laser processing machine 30 can perform laser processing on the lens member. Thus, the laser processing machine 30 can perform laser processing on the lens member.

[0170] That is to say, in order to obtain the patterned lens member by laser processing, at least the following processes are performed:

[0171] A process of positioning a lens member having a first surface and a second surface in a predetermined posture, where the first surface is a convex optical surface and the second surface is an optical surface facing the first surface;

[0172] A process of using the size measurement result of the first surface of the positioned lens member to identify the surface shape data of the first surface; and

[0173] A step of irradiating a first surface of a lens member with a laser to perform laser processing on the first surface and controlling the irradiation position of the laser based on surface shape data.

[0174] In addition, when performing these steps, the lens member as the object to be processed is placed in a vertically erected state. Thus, in any step (especially the step of performing laser processing), foreign substances (such as removed substances generated by laser processing) fall in the direction of gravity, so that attachment of such foreign substances to the optical surface of the lens member can be suppressed.

[0175] Here, the step of performing laser processing on the first surface of the lens member will be further described in detail.

[0176] (Wavelength of the laser)

[0177] The laser irradiated on the lens member is used to partially remove the thin film 13a, and preferably no damage caused by irradiation is generated on the lens substrate 11 and the HC film 12 other than the thin film 13a. Therefore, in the present embodiment, when irradiating the laser, a laser having the following wavelength is used.

[0178] When the transmittance of the laser is large, since the member irradiated with the laser is difficult to absorb the energy of the laser (that is, since the laser easily transmits), damage and the like generated in the member can be suppressed. On the other hand, when the transmittance is small, since the absorption rate of the energy of the irradiated laser is high, processing and the like (such as partially removing the member) can be efficiently performed using the absorption of the energy. Therefore, if the transmittance difference between the stacked members is large, processing and the like using the laser can be achieved only for one kind of member.

[0179] Based on this, as the irradiated laser, a laser having a wavelength belonging to a band in which the difference between the transmittance of the lens substrate 11 and the transmittance of the thin film 13a is 1% or more, preferably 3% or more, more preferably 5% or more, and further preferably 10% or more is used. Furthermore, in addition to the transmittance of the lens substrate 11, for the transmittance of the HC film 12 as a non-removal film, a laser having a wavelength belonging to a band in which the difference from the transmittance of the thin film 13a is 1% or more, preferably 3% or more, more preferably 5% or more, and further preferably 10% or more is also used. In addition, for the transmittance of the AR film 14 as another non-removal film, a laser having a wavelength belonging to a band in which the difference from the transmittance of the thin film 13a is 1% or more, preferably 3% or more, more preferably 5% or more, and further preferably 10% or more can also be used.

[0180] In addition, the transmittances of the lens substrate 11, the HC film 12, and the AR film 14 described here can include the transmittance of their superposed bodies.

[0181] As a wavelength band with a transmittance difference of 5% or more (i.e., a more preferable transmittance difference), for example, a wavelength band of 380 nm to 1150 nm can be cited. Moreover, as the laser with a wavelength belonging to such a wavelength band, in the removal process (S104), for example, a laser with a wavelength of 1064 nm is irradiated. If it is a laser with a wavelength of 1064 nm, the transmittance difference is 10% or more, and the transmittances of the lens substrate 11 and the HC film 12 are 90% or more, and the influence of the laser on the lens substrate 11 can be suppressed.

[0182] In this way, by making the transmittance difference at least 1% or more, it is possible to achieve: when irradiating the laser, the laser is transmitted through the lens substrate 11, the HC film 12, etc. (without causing damage), and the absorption rate of the thin film 13a is high, so that only the irradiated part is removed. That is to say, it is possible to directly pattern the thin film 13a by laser irradiation. In addition, if the transmittance difference is preferably 3% or more, more preferably 5% or more, and further preferably 10% or more, direct patterning can be accurately performed by laser irradiation.

[0183] In addition, considering that the lens substrate 11, the HC film 12, the thin film 13a, etc. all have light transmittance, the upper limit of the transmittance difference is about 50%.

[0184] (Focus position of the laser)

[0185] The three-dimensional control of the focus position when irradiating the above laser is as follows.

[0186] First, the laser processing machine 30 obtains the surface shape data of the first surface of the lens member as the object to be processed from the control unit of the lens positioning mechanism. On the other hand, the laser processing machine 30 obtains the pattern data of the pattern portion 20 to be formed on the lens member as the object to be processed from the upper device of the laser processing machine 30.

[0187] Then, the laser processing machine 30 makes the focus position of the laser variable in the XY direction according to the obtained pattern data, and makes the focus position of the laser variable in the Z direction according to the obtained surface shape data. In this way, the laser processing machine 30 performs three-dimensional control of the focus position of the irradiated laser.

[0188] The surface shape data of the lens member as the basis for such three-dimensional control is the data recognized in the state where the lens member of the lens positioning mechanism is positioned in a specified posture with the first surface as the reference. Moreover, the lens member also maintains the positioned posture in the state where it is arranged at a position where the laser processing machine 30 can perform laser processing. Therefore, the laser processing machine 30 can three-dimensionally control the focus position of the laser with high precision.

[0189] In addition, for example, when the lens member is a prism lens, since the surface shape data is recognized in a state where the first surface is used as a reference for positioning, the prism amount of the lens member does not affect the three-dimensional control, unlike the case where the second surface is used as a reference. Therefore, the laser processing machine 30 does not need to perform data correction considering the prism amount, etc., and can precisely three-dimensionally control the focal position of the laser, and can suppress the complication of processing due to precise control.

[0190] In addition, since the surface shape data of the lens member is recognized based on the measurement result of the sensor unit 70, for example, even when the curvature (bending) of the first surface of each lens member is different, the difference in the curvature can be accurately reflected. In this regard, the laser processing machine 30 can also three-dimensionally control the focal position of the laser with high precision.

[0191] That is, after the positioning by the lens positioning mechanism, by obtaining the surface shape data from the lens positioning mechanism, regardless of whether the lens member as the object to be processed is a prism lens or the curvature (bending) of the first surface of the lens member, the laser processing machine 30 can easily and highly precisely three-dimensionally control the focal position of the laser. Therefore, when patterning the first surface of the lens member by laser processing using the laser processing machine 30, the complication of the processing is suppressed while achieving high precision of the patterning.

[0192] (Specific example of patterning)

[0193] Here, a specific example will be given to illustrate the pattern portion 20 formed by patterning using the laser processing of the laser processing machine 30.

[0194] In the following description, the case where the lens member as the object to be processed is a prism lens will be taken as an example. A prism lens is an eyeglass lens with an added prism, and its first surface (the surface on the object side) and the second surface (the surface on the eyeball side) face each other with a prism amount. Having a prism amount means that the prism amount is not "0".

[0195] As described above, when the object to be processed is a prism lens, the pattern portion 20 formed on its first surface is also formed by laser processing after positioning based on the first surface, and the laser processing is performed corresponding to the three-dimensional control of the focal position of the laser based on the surface shape data of the first surface. Therefore, the pattern portion 20 is patterned with high precision and is formed with the following accuracy.

[0196] Figure 11It is a partial enlarged view showing a specific example of the pattern portion of the spectacle lens according to the present embodiment. In addition, the legend is a dot pattern in which the pattern portion 20 is constituted by a plurality of points (same-shaped portions) 21, and the microscopic observation results of the dot pattern arranged near the center of the first surface of the lens member and the microscopic observation results of the dot pattern arranged near the periphery of the same optical surface are respectively shown. In addition, in Figure 11 (a) shows an example of the dot pattern according to the present embodiment obtained by laser processing. On the other hand, Figure 11 (b) shows an example of the dot pattern obtained by the inkjet recording method as a comparative example.

[0197] As Figure 11 (a) shows, the pattern portion 20 of the dot pattern of the present embodiment is configured such that points (same-shaped portions) 21 are arranged on the optical surface, and the dimensional deviation of each point 21 is ±10% or less, preferably 6% or less, more preferably 2% or less.

[0198] In addition, the dimensional deviation of each of the points 21 constituting the dot pattern arranged near the center of the optical surface of the spectacle lens 10 is also ±10% or less, preferably 6% or less, more preferably 2% or less, compared with the points 21 constituting the dot pattern arranged near the periphery of the same optical surface.

[0199] The "dimensional deviation" here refers to at least one, preferably both, of (1) the deviation of the diameter dimension between the points that are substantially circular when viewed from above and (2) the deviation of the diameter dimension (aspect ratio) of the length and width of a certain point 21. Specifically, regarding the above (1), the diameter dimension deviation of each point 21 is, for example, 440 ± 44 μm or less, preferably 440 ± 26 μm or less, more preferably 440 ± 8 μm or less, whether near the center or the periphery of the optical surface. In addition, regarding the above (2), the deviation of the aspect ratio of each point 21 is, for example, 440 ± 44 μm or less, preferably 440 ± 26 μm or less, more preferably 440 ± 8 μm or less.

[0200] On the other hand, in the dot pattern obtained by the inkjet recording method shown in Figure 11 (b), the dimensional deviation of each point exceeds about ±10%, specifically exceeding 440 ± 44 μm. In addition. Especially near the periphery of the optical surface, due to the time difference of ink landing, there may be point connections where points are connected, satellite points (small dots) sputtered around the original points, etc., and the tendency for the deviation of the aspect ratio to become larger is high.

[0201] That is, in the case where the first surface of the lens member is a convex curved surface, for example, problems such as dimensional deviation exceeding about ±10% and dot shape breakage (deviation of aspect ratio) occur in the inkjet recording method. In contrast, as described in the present embodiment, if a series of processes are performed after positioning based on the first surface, even when the object to be processed is a prism lens, the dimensional deviation of forming the pattern portion 20 on the first surface side can be controlled within ±10%, preferably within 6%, more preferably within 2%. In particular, for the deviation of the aspect ratio in the above (2), the improvement degree is higher compared to the case of the inkjet recording method. Therefore, even when forming a dot pattern composed of a plurality of points 21 arranged on the curved optical surface, the dot pattern can be formed with very high precision, and as a result, the stable quality of the patterned lens member can be ensured.

[0202] Especially in the case where the first surface is a convex curved surface, although the possibility of generating the maximum dimensional deviation is high near the center and the periphery of the first surface, as described in the present embodiment, if the focus position is three-dimensionally controlled and a laser is irradiated for patterning, the maximum dimensional deviation can be controlled within ±2%. Therefore, for example, even when the dot pattern is arranged over the entire surface of the first surface, the dot pattern can be formed with very high precision, and as a result, the stable quality of the patterned lens member can be ensured.

[0203] In addition, in the above description, although specific numerical values are given as examples for the diameter size of the point 21, it is not necessarily limited thereto.

[0204] It is considered that the diameter DD of the point 21 is, for example, 0.01 mm or more, more preferably 0.05 mm or more, further preferably 0.1 mm or more, and for example, 5.0 mm or less, preferably 2.0 mm or less, more preferably 1.0 mm or less, further preferably 0.5 mm or less.

[0205] In addition, it is considered that the interval AD from the center of a certain point 21 to the center of an adjacent point 21 is, for example, 0.1 mm or more, preferably 0.2 mm or more, more preferably 0.3 mm or more, and for example, 5.0 mm or less, preferably 3.0 mm or less, more preferably 1.0 mm or less.

[0206] It is considered that the value of the interval AD / diameter DD is preferably greater than 1.0, more preferably 1.1 or more, further preferably 1.2 or more, and preferably 2.0 or less, more preferably 1.8 or less, further preferably 1.5 or less.

[0207] Even in any case, the dimensional deviation in the present embodiment is controlled within ±10%, preferably within 6%, more preferably within 2%.

[0208] (8) Effects of the laser processing according to the present embodiment

[0209] The following effects are obtained by the laser processing according to this embodiment.

[0210] In this embodiment, after the positioning by the lens positioning mechanism, based on the surface shape data obtained from the lens positioning mechanism, the laser processing machine 30 three-dimensionally controls the focal position of the laser. Thus, regardless of whether the lens member as the object to be processed is a prism lens or not, and regardless of the curvature (bending) of the first surface of the lens member, data correction considering the prism amount etc. is not required, and the focal position of the laser can be easily and highly accurately three-dimensionally controlled. Therefore, patterning of the first surface of the lens member can achieve high accuracy of the patterning while suppressing complication of the processing.

[0211] In addition, in this embodiment, since a series of processes are performed while the lens member as the object to be processed is erected in the vertical direction, it is possible to suppress the situation where foreign matters etc. adhere to the optical surface of the lens member during the processing. Therefore, it is preferable in terms of improving the quality of the lens member.

[0212] In addition, in this embodiment, in the pattern portion 20 formed by patterning, the dimensional deviation of each point 21 constituting the pattern portion 20 is ±10% or less, preferably 6% or less, more preferably 2% or less. In the case where the lens member as the object to be processed is a prism lens, for example, the inkjet recording method generates a dimensional deviation of more than about ±10%, but after positioning based on the first surface, if the focal position of the laser is three-dimensionally controlled based on the surface shape data of the first surface for patterning, the dimensional deviation can be controlled within ±10% or less, preferably 6% or less, more preferably 2% or less. Therefore, even for the pattern portion 20 configured by arranging a plurality of points 21, the patterning can be highly accurately performed.

[0213] Especially in the case where the first surface is a convex curved surface, although there is a high possibility of generating the maximum dimensional deviation near the center and the periphery of the first surface, by controlling the maximum dimensional deviation within ±10% or less, preferably 6% or less, more preferably 2% or less, high accuracy of patterning of the thin film 13a is achieved, which is very preferable in terms of ensuring stable quality of the lens member.

[0214] (9) Modification examples etc.

[0215] The embodiments of the present invention have been described above, but the above disclosure represents the content of the exemplary embodiments of the present invention. That is, the technical scope of the present invention is not limited to the above exemplary embodiments, and various changes can be made without departing from the gist thereof.

[0216] In the above-described embodiments, the case where the lens member is the spectacle lens 10 or the special-shaped lens 10a has been mainly described as an example. However, the present invention is not limited thereto. That is, as long as it has a first surface as a convex optical surface and a second surface as an optical surface facing the first surface, the lens member as the object to be processed may also be a member other than the spectacle lens 10 or the special-shaped lens 10a.

[0217] In addition, the case where the spectacle lens 10 or the special-shaped lens 10a is a prism lens has been described as an example. However, the lens member having no prism amount can also be processed by the present invention.

[0218] In addition, in the above-described embodiments, the case where the pattern portion 20 is a dot pattern composed of a plurality of dots (identical shape portions) 21 has been described as an example. However, the present invention is not limited thereto. That is, the pattern portion 20 may not be composed of the dots 21, for example, it may be composed of letters, graphics, etc. In addition, the pattern portion 20 may not be formed on the entire optical surface of the spectacle lens 10, and may be formed partially. In addition, minute dots 21 may be aggregated to form letters, graphics, etc.

[0219] Description of Reference Numerals

[0220] 10: Spectacle lens (lens member);

[0221] 10a: Special-shaped lens (lens member);

[0222] 11: Lens substrate;

[0223] 12: HC film;

[0224] 13: Patterned film;

[0225] 13a: Film;

[0226] 14: AR film;

[0227] 20: Pattern portion;

[0228] 21: Dot;

[0229] 30: Laser processing machine;

[0230] 40: Lens mounting table;

[0231] 41: Notch portion;

[0232] 50: Member holding portion;

[0233] 51: Spacer portion;

[0234] 52: Connector portion;

[0235] 53: Sliding mechanism portion;

[0236] 54: Elastic member;

[0237] 55: Brake part;

[0238] 56: First electric actuator part;

[0239] 57: Second electric actuator part;

[0240] 60: Attitude control part;

[0241] 61: Support claw;

[0242] 62: Taper part;

[0243] 63: Claw drive part;

[0244] 64: Claw rotation part;

[0245] 70: Sensor part;

[0246] 71: Contact part;

[0247] 72: Moving mechanism;

[0248] 80: Auxiliary tool.

Claims

1. A lens positioning mechanism, comprising: A component holding part that holds the second surface of a lens component having a first surface and a second surface, and has a function of applying a force to the held lens component toward the first surface side. The first surface is a convex optical surface, and the second surface is an optical surface facing the first surface; and An attitude control part that restricts edge positions at multiple locations on the first surface of the lens component to which the force is applied by the component holding part, and positions the lens component in a specified attitude with the first surface as a reference. The attitude control part is configured to have a tapered part that widens in the force application direction of the lens component, and restricts the edge positions by abutting the edge positions against the tapered part.

2. The lens positioning mechanism according to claim 1, wherein: The attitude control part has a plurality of support claws respectively corresponding to the multiple locations. The tapered parts are respectively provided on the plurality of support claws.

3. The lens positioning mechanism according to claim 2, wherein: The attitude control part has a claw driving part that moves the plurality of support claws to switch between a clamped state and a non-clamped state of the lens component.

4. The lens positioning mechanism according to any one of claims 1 to 3, wherein: The component holding part has: A gasket part that holds the second surface of the lens component by vacuum adsorption; and A joint part that is configured to support the gasket part so as to be freely swingable and can switch between a movable state and a fixed state of the swinging part.

5. The lens positioning mechanism according to any one of claims 1 to 3, wherein: The component holding part has an elastic member that expands and contracts in the force application direction of the lens component.

6. The lens positioning mechanism according to claim 5, wherein: The component holding part has a brake part that maintains the bent state of the elastic member.

7. The lens positioning mechanism according to any one of claims 1 to 3, comprising: A sensor part that detects the relative position of a specified point on the first surface of the lens component with respect to the restricted position when positioned by the attitude control part.

8. The lens positioning mechanism according to any one of claims 1 to 3, wherein: The lens component is an eyeglass lens.

9. A lens manufacturing apparatus, comprising: The lens positioning mechanism according to any one of claims 1 to 3; and A component processing part that performs a specified process on the first surface of the lens component positioned in a specified attitude by the lens positioning mechanism.

10. A method for manufacturing a lens component, comprising: A step of applying a force to a lens component having a first surface and a second surface toward the first surface side. The first surface is a convex optical surface, and the second surface is an optical surface facing the first surface; A step of restricting the edge positions by abutting a tapered part that widens in the force application direction of the lens component against edge positions at multiple locations on the first surface of the lens component to which the force is applied, and positioning the lens component in a specified attitude with the first surface as a reference; and A step of performing a specified process on the first surface of the lens component positioned in the specified attitude.

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