KR20070003687A - Lens of plastic glasses, fabricating method thereof, marking method and marking device - Google Patents

Abstract

Plastic glass lenses and a manufacturing method thereof, and a marking method and device are provided to form marks with desired visibility at the positions where the mark does not disturb a visual field and the mark is not removed by cutting, without damaging an anti-reflection film. Plastic glass lenses have a hard coat film(4) and an anti-reflection film(5) on the surface of a lens base material(3). A mark is installed at the position incapable of disturbing a visual field and favorably recognized from the outside. The hard coat film correspondent to a part where the mark is formed is removed. A recessed part(6) is formed by removing only a very small portion of the lens base material from the surface inwardly. The mark is favorably recognized from the outside by forming a desirable section on the recessed part of the hard coat film and the anti-reflection film on the surface of the lens base material.

Description

Plastic eyeglass lens, manufacturing method thereof, marking method and marking device {LENS OF PLASTIC GLASSES, FABRICATING METHOD THEREOF, MARKING METHOD AND MARKING DEVICE}

1 is a plan view of a short focus spectacle lens that is a plastic spectacle lens according to an embodiment of the present invention.

2 is a plan view of a progressive refractive power spectacle lens that is a plastic spectacle lens according to another embodiment.

3 is a cross-sectional view of the visible mark portion in FIG. 1 or FIG. 2.

It is explanatory drawing of the plastic spectacle lens manufacturing system which manufactures the plastic spectacle lens which concerns on embodiment of this invention.

5 is an explanatory diagram of a laser marking device.

6 is a flowchart of the manufacturing process.

7 is an explanatory diagram of an ordering screen.

8 is an explanatory diagram of a laser marking method.

9 is a flowchart of marking acceptance judgment.

It is a figure which shows the evaluation result of a marking specific example.

It is a figure which shows the evaluation result of the marking specific example.

It is a figure which shows the measurement result of a recessed part.

It is a figure which shows the measurement result of a recessed part.

It is explanatory drawing of the specific example of mark positioning.

It is explanatory drawing which shows the other example of the lens holding apparatus of a laser marking apparatus.

16 is a flowchart of the marking process.

It is explanatory drawing of the marking position height measuring method.

18 is a flowchart showing another example of marking acceptance judgment.

It is explanatory drawing of the specific example of mark positioning in another example of the marking acceptance judgment.

[Description of the code]

3 lens material

4 hard coats

5 anti-reflection film

6 concave

110 short throw glasses lens

111 optical center

112 lens cut shape

113 No visible mark grant area

120 progressive refractive lens

121 yuan eye points

123 visible mark

The present invention relates to a plastic spectacle lens provided with a mark that can be visually recognized from the outside, a manufacturing method thereof, a marking method, and a marking device.

The plastic lens for eyeglasses is provided with a desired mark for identification of its own product and other company's products, or for displaying information relating to the lens such as a product number, a standard, and a specific position indication. In the case of giving a mark to a spectacle lens, it is required that the mark is as inconspicuous as possible due to the nature of the product. Therefore, in general, it is difficult to recognize by the naked eye, and so-called concealment marks are often provided, which can be recognized by observing from a specific angle, for example, as necessary.

As a method of applying such a mark to a lens, a method of engraving with a needle made of a hard material such as diamond, a method of marking with a laser, a method of transferring irregularities formed in a mold at the time of lens molding, or the like There is this. The laser marking method is to apply a mark to a plastic lens by irradiating a laser beam. This method has been recently used because it is easy to operate and easy to automate.

However, a thin film such as an antireflection film is usually coated on the surface of the plastic lens for spectacles. Therefore, if the needle or laser is marked after the anti-reflection film is formed, the anti-reflection film may be damaged and the thin film may peel off from the mark portion. In addition, the portion where the thin film is damaged by the marking may easily penetrate moisture and deteriorate the lens.

On the other hand, when the uneven portion is provided to the lens substrate itself during lens molding, such as when the mark is transferred by the forming mold, the mark is set before the lens cut shape is determined. Therefore, the mark can be set at a predetermined position in the lens cut shape. none.

For this reason, several methods of laser marking without damaging thin films, such as an anti-reflective film on the lens surface, are proposed. For example, Japanese Patent No. 2810151 discloses a laser marking method in which a laser beam is focused inside an spectacle lens to give a mark to the interior of the spectacle lens. Patent 3030895 discloses a marking method in which a laser beam is focused near the surface of the lens base of the spectacle lens to give a mark to the interior of the spectacle lens.

Also, rather than forming a mark inconspicuous like the above concealed mark, the lens is provided with a mark or decoration that can be recognized from an external person for the purpose of displaying various information such as decoration, brand display, initials, and the like. Some have also been proposed (see Patent Documents 3 to 5 below). That is, Japanese Patent Application Laid-Open No. 55-47016 (Patent Document 3) discloses that a pattern is formed by engraving a groove on the surface of a portion approaching the edge of the lens. In addition, Japanese Patent Application Laid-Open No. 61-190523 (Patent Document 4) discloses that a hologram is formed by a molding process to form a pattern that is translucent to a wearer of glasses and is visible from the outside. In addition, Japanese Unexamined Patent Publication No. 59-17801 (Patent Document 5) discloses a lens in which a pattern is prepared by printing on a lens surface and a transparent resin layer is formed on the surface thereof.

In the case of forming a mark having good visibility from the outside (hereinafter also referred to as a visible mark) on the plastic lens for eyeglasses, it was difficult to obtain sufficient visibility without damaging a thin film such as an antireflection film by a method of forming a conventional concealed mark. It was. That is, in order to improve visibility by the conventional method of stamping with a needle or a laser, it is necessary to form a groove deeper, and the damage degree of various thin films, such as an anti-reflective film, becomes larger, and peeling of a film | membrane becomes more likely to occur.

 As described above, when the laser is focused and irradiated inside the lens or in the vicinity of the surface of the lens substrate, the amount of outgoing energy of the laser light and the convergence point must be strictly adjusted and the visibility is good. In order to achieve this, the output of the laser and the irradiation time must be made larger. Therefore, it is difficult to form a visible mark so that the influence on the antireflection film and the substrate does not appear. In addition, when a mark having good visibility is formed on a plastic lens for spectacles, problems may arise in spectacles function when the mark enters the watch of the spectacle wearer. In addition, when a mark is applied to a lens before an order as in the conventional concealment mark, there is a fear that the mark portion is erased when the lens is cut after an order. In addition, a method of forming a hard coat film after depositing the lens substrate and depositing an anti-reflection film thereon can be considered. There is a case. Since the lens needs to be heated when the antireflection film is deposited, the surface of the hard coat film may be smoothed under the influence of this heat, and the mark may not be clear.

The present invention has been made under the above-described background, and an object thereof is to obtain a plastic spectacle lens in which a mark having good visibility is formed without damaging a thin film such as an antireflection film. Another object of the present invention is to obtain a plastic spectacle lens in which a mark having good visibility is formed at a position where it is difficult to obstruct the field of view and at a position not removed when cut.

As means for solving the above problems, the first means,

A plastic spectacle lens having a hard coat film and an anti-reflection film on a surface of a lens base material, wherein the mark is formed on a portion of the mark forming the spectacle lens, in which a mark that can be visually recognized from the outside is provided at a position that does not obstruct the field of view. On the other hand, the hard coat film is removed, and only a small amount of the lens substrate is removed from the surface toward the inside to form a concave portion, and a desired cross section and the lens substrate are formed on the concave portion of the hard coat film. The anti-reflection film is formed on the surface of the concave portion of the plastic spectacle lens, which enables visual recognition from the outside.

Second means,

It is a plastic spectacle lens according to the first means, wherein the concave portion has a depth of 5 µm or more and a width of 90 µm or more.

Third means,

A plastic spectacle lens according to the first or second means, wherein a water repellent film is formed on the anti-reflection film.

Fourth means,

In the marking method of giving a mark to a plastic spectacle lens,

A hard coat film is provided on the plastic spectacle lens base material,

Next, while removing the hard coat film in the form of the mark, the hard coat film and a part of the substrate are further removed so that a recess of a predetermined depth is formed in the substrate itself,

Subsequently, by providing an anti-reflection film on the surface of the hard coat film and the surface of the concave portion of the base material, a mark that can be visually recognized from the outside is formed.

The fifth means,

The depth of the said concave part is 5 micrometers or more, and width is 90 micrometers or more, The marking method which concerns on the 4th means characterized by the above-mentioned.

Sixth means,

The formation of the recess is a marking method according to the fourth or fifth means, which is performed by laser irradiation.

Seventh means,

The mark is a marking method according to any one of the fourth to sixth means, wherein the mark is formed outside the predetermined area on the basis of the eye point or the prism measurement reference point.

Eighth means,

The marking method according to the sixth or seventh means, characterized in that the height of the mark applying position is measured before the laser irradiation, and the laser irradiation is performed after the mark applying position and the focal length of the laser irradiation are adjusted based on the measured height. .

The ninth means,

In the plastic spectacle lens manufacturing method of manufacturing a plastic spectacle lens by applying a predetermined processing to the plastic lens material,

A plastic spectacle lens manufacturing method comprising the step of performing marking by a marking method according to any one of the fourth to eighth means.

Tenth means,

A marking device for marking a plastic spectacle lens,

The lens cut shape information, eye point or prism measurement reference point position information, mark non-imparting area information that defines an area where no mark is given based on the eye point or prism reference point, and conditions for the position where the mark is given are determined. Means for calculating a mark granting position based on the mark designation information,

The marking device calculates the mark assigning position as a mark assigning position at a predetermined position based on the mark designating information, and determines a position not belonging to the mark non-providing region defined by the mark non-granting region information. to be.

Eleventh means

In the mark designation information, the mark position search priority in the case where a mark cannot be given is determined, and in the case where the mark cannot be attached, the mark position search priority is changed according to the mark position search priority to calculate the grant position. It is a marking apparatus which concerns on the 10th means characterized by the above-mentioned.

12th means,

The mark provision position contained in the mark designation information is a marking apparatus according to the tenth or eleventh means, which is determined by an angle from a frame center and a distance from an outer periphery of a lens cut shape. .

The thirteenth means,

And the mark assigning position is calculated by sequentially shifting the angle in accordance with the mark position search priority when the mark assigning position is not determined.

Fourteenth means,

And the mark assigning position is calculated by sequentially shifting the distance from the outer circumference according to the mark position search priority when the mark assigning position is not determined.

15th means,

The mark applying position is a marking apparatus according to any one of the tenth to twelfth aspect, wherein the mark applying position is arranged at a position not overlapping with the region where the range holding member is located.

Best mode for carrying out the invention

EMBODIMENT OF THE INVENTION Hereinafter, the plastic spectacle lens which concerns on embodiment of this invention, the manufacturing method, the marking method, and the marking apparatus are demonstrated. In the following description, first, the plastic spectacle lens according to the embodiment of the present invention will be described. Next, the manufacturing system of the plastic spectacle lens will be described, and accordingly, the manufacturing method, the marking method, and the marking apparatus for the plastic spectacle lens will be described. Explain.

<Plastic glasses lens>

1 is a plan view of a short focus spectacle lens that is a plastic spectacle lens according to an embodiment of the present invention, FIG. 2 is a plan view of a progressive refractive power spectacle lens that is a plastic spectacle lens according to another embodiment, and FIG. It is sectional drawing of the visible mark part in this. EMBODIMENT OF THE INVENTION Hereinafter, the plastic spectacle lens which concerns on embodiment of this invention is demonstrated, referring these drawings.

(Short throw glasses lens)

First, the short focus spectacle lens will be described. In Fig. 1, reference numeral 110 denotes a monofocal spectacle lens (also called a monofocal lens), and both surfaces thereof are each processed into a predetermined curved shape, but still have a shape (lens cut shape or jade shape) inserted into a frame (frame). Etc.) is of an unprocessed shape (also called a round lens or an uncut lens). The short focus lens 110 is processed (also referred to as an edging process or an jade process) so as to have a shape of a lens cut shape 112 which is a shape that can be fitted to a spectacle frame selected by a customer, and is inserted into the frame.

The short focal spectacle lens 110 is provided with a visible mark 114 having a shape of "H" at the position of the upper left side (upper ear side of the right eye lens) inside the lens cut shape 112. This visible mark 114 is formed at a position outside of the visible mark non-applying region 113. This visible mark non-applying region 113 is provided so that the visual recognition mark is not positioned at a position that obstructs the watch of the spectacles wearer. As a reference position of this visible mark non-improvement area, what is necessary is just to set based on the eye point position in the case of a short focal lens. Since the eye point is the same as the optical center in the case of the short focal lens, the eye point is set based on the optical center 111 in this embodiment. In this embodiment, 30 mm or less in diameter is made into the mark non-improvement area centering on the optical center 111 (eye point). In addition, the lens cut shape 112, the visible mark non-applying region 113, and the optical center 111 shown in FIG. 1 are information used for determining a marking position, and are not actually displayed on the lens.

(Progressive lens lens)

Next, a progressive refractive power spectacle lens will be described. In Fig. 2, reference numeral 120 denotes a progressive refractive power spectacle lens (also called a progressive refractive power lens or a progressive lens), and although both surfaces are each processed into a predetermined curved shape, the shape is still inserted into a frame (frame) (lens cut). It is also referred to as a shape or a jade shape, which is not processed (also called a round lens or an uncut lens). The progressive refractive power lens 120 is processed (also referred to as an edging process or an jade process) so as to have a shape of a lens cut shape 122 which is a shape that can be fitted to a spectacle frame selected by a customer, and is inserted into the frame.

In this progressive refractive power spectacle lens 120, a visible mark 124 having a shape of "H" is formed at an inner left upper position (upper ear of the right eye lens) inside the lens cut shape 122. This visible mark 124 is formed at a position outside the visible mark non-applying area 123. The visible mark non-applying area 123 is provided so that the visual recognition mark is not positioned at a position that obstructs the watch of the spectacles wearer. As the reference position of the visible mark non-improvement region, in the case of a progressive refractive lens, it is preferable to set the prism measurement reference point position as a reference. In this embodiment, the mark non-imparting area is made less than 30 mm in diameter centering on the prism measurement reference point 131. As shown in FIG. In addition, the lens cut shape 122, the visible mark non-improvement area 123, and the prism measurement reference point position 131 shown in FIG. 2 are information used for determining the marking position, and are not actually displayed on the lens. .

In addition, as the visible mark non-improvement area in the progressive refractive power lens, in addition to the area determined on the basis of the prism measurement reference point position 131, it is determined on the basis of the original eye point (fitting point 121). You may add an area. In this case, it can be marked so as not to disturb the original clock. Moreover, you may add the non granting area | region based on the near eye point 132. FIG. This is preferable because the marking can be performed so as not to disturb the near field of vision even when a mark is provided below the lens. In addition, in the case of a progressive refractive lens, a manufacturer's identification mark, an alignment reference mark, a subscription refractive index indication, a progressive large intestine indication, etc. are provided as what is called a concealment mark, as determined by JIS. The manufacturer identification mark 126, the alignment reference marks 125a and 125b, the subscription refractive index indication 127, and the progressive colon display 128 in FIG. 2 have shown this concealment mark. In addition, although the short focus lens and the progressive refractive power lens are demonstrated as the plastic spectacle lens of the present embodiment, the present invention is applicable to lenses other than these. For example, in the case of a multifocal lens, the visible mark non-improvement area is set based on the far-field optical center (circular eye point). In addition, in the case of this multifocal lens, in addition to the visible mark non-impartment area | region defined based on the far-field optical center position, you may add the area | region defined on the basis of the intermediate | middle optical center or the near-field optical center, and a jade ) Area may be added. In this case, since it can mark so that it may not disturb the clock other than original use, it is preferable. In this invention, the reference point of the visible mark non-improvement area | region in the above-mentioned various lenses is only called a mark non-reference reference point. In addition, in the present invention, the term "plastic spectacle lens" includes the concept of an uncut lens, a lens after lens cut shape processing, or a lens in a state where it is sandwiched in the spectacle frame. In addition, description of the following embodiment is demonstrated with the case of a monofocal lens or a progressive refractive lens.

(Section structure of visible mark)

Next, the cross-sectional structure of the visible mark part in FIG. 1 or FIG. 2 is demonstrated. In FIG. 3, the hard focus film 4 is formed on the surface of the lens base material 3, and the antireflection film 5 is formed on the hard focus film 4. Is formed. Here, in the visible marks 114 and 124, the hard coat film 4 is removed with respect to the portions constituting these marks, and only a small amount of a portion of the lens base material 3 is removed from the surface to the inside to concave. (6) is formed. The antireflection film 5 is formed on the concave portion 6 of the hard coat film 4 and on the surface of the concave portion 6 of the lens substrate 3.

In this example, the periphery 61 of the concave portion 6 is larger than the lens surface. Here, when the depth from the peripheral part 61 surface to the bottom part of the concave part 6 is made into D1, and the depth from the lens surface to the bottom part of the concave part 6 is made into D2, D1 is 6.2 micrometers. As mentioned above, D2 is 5 micrometers or more. In addition, the width W of the concave portion 6 is 90 μm or more. In addition, the lens base material used for the plastic lens for spectacles of the present invention is preferably made of a synthetic resin, for example, methyl methacrylate homopolymer, copolymer of methyl methacrylate and at least one other monomer, diethylene glycol bis Arylcarbonate homopolymers, copolymers of diethylene glycol bisaryl carbonates with one or more other monomers, sulfur containing copolymers, halogen containing copolymers, polycarbonates, polystyrenes, polyvinyl chloride, unsaturated polyesters, polyethylene terephthalates, polyurethanes Etc. can be mentioned. The hard coat layer formed on the surface of the lens substrate is a hard coat layer containing an organosilicon polymer, which is formed by a coating method such as a dipping method or a spin coating method. Moreover, an antireflection film is provided on this hard coat layer.

<Plastic spectacle lens manufacturing system, manufacturing method, marking method and marking device>

4 is an explanatory diagram of a plastic spectacle lens manufacturing system for manufacturing a plastic spectacle lens according to an embodiment of the present invention, FIG. 5 is an explanatory diagram of a laser marking apparatus, FIG. 6 is a flowchart of a manufacturing process, and FIG. Fig. 8 is an explanatory diagram of a screen, Fig. 8 is an explanatory diagram of a laser marking method, Fig. 9 is a flow chart of marking acceptance determination, Figs. 10 and 11 are evaluation results of a marking specific example, Figs. 12 and 13 are measurements of concave shaped portions. 14 is an explanatory view of a specific example of mark positioning, FIG. 15 is an explanatory view showing another example of a lens holding device of a laser marking device, FIG. 16 is a flowchart of a marking process, and FIG. 17 is a marking position height measurement. 18 is a flowchart showing another example of marking acceptance judgment, and FIG. 19 is an explanatory diagram of a specific example of mark positioning in another example of marking acceptance determination. Hereinafter, with reference to these figures, the manufacturing system of a plastic spectacle lens is demonstrated, In addition, the manufacturing method, marking method, and marking apparatus of a plastic spectacle lens are demonstrated.

(Plastic eyeglass lens manufacturing system)

The plastic spectacle lens manufacturing system shown in FIG. 4 is an example of a system in which an eyeglasses retailer and a factory are connected online, where an order is placed, and a lens is manufactured and delivered based thereon. In FIG. 4, the glasses retailer 60 as an example of the ordering side and a lens maker factory 80 as an example of the lens processing side are connected by a communication medium 10. Although the communication medium 10 is not specifically limited, For example, a public communication line, a dedicated line, the Internet, etc. can be used. In addition, a relay station may be provided in the communication medium 10 on the way. In addition, although the ordering side is demonstrated in the case of the eyewear store 60, it is not limited to this, For example, it may be an ophthalmologist, an individual, or the office of a lens maker. Although only one ordering side is shown in Fig. 4, in practice, a plurality of connection sides can be connected through a communication medium.

The eyewear store 60 is provided with a computer 61 (hereinafter also referred to simply as an ordering terminal) as an online ordering terminal and a frame shape measuring device (frame tracer) 62 for measuring the frame shape of the spectacle frame. have. The ordering terminal 61 is a terminal for transmitting / receiving information necessary for ordering lenses or glasses, and may be a dedicated terminal or may be one in which a software for lens ordering is installed in a general-purpose computer. In addition, a WWW (World Wide Web) server may be provided in a network or a relay station on the factory side, and a document or a program for order may be registered therein to display an order screen in the WWW browser of the ordering terminal.

In the factory 80, a main control computer 30, a data server 40, a laser marking device 20, and various processing devices 81, 82, 83, 84 are connected via a network. The main control computer 30 is connected to an unillustrated connection means for connecting with the order terminal computer 61, and order processing means 31 for accepting and processing an order of glasses or spectacle lenses from the order terminal computer 61. ) And design data creation means 32 for creating design data of spectacle lenses to be manufactured based on the order received, and processing data creation means for creating processing data necessary for control of various manufacturing apparatuses based on the design data. (33), the lens cut shape calculating means 35 which calculates the area | region of the lens cut shape (jade shape) in a lens base material based on the said design data, and the determination of the visibility of marking of visible mark, and marking positioning. Marking for creating machining data necessary for the control of the marking / marking determination / positioning means 36 to be performed and the laser marking apparatus for marking the determined mark position. Processing data creation means 34 and a means not shown for controlling and managing various processing devices, including a laser marking device, and the like are provided.

The data server 40 includes lens information in which order data 410, which is the order contents input from the ordering terminal computer 61, marking data 420, which is various data required for marking, and information on various lenses are registered. The data 430 and the frame information data 440 in which data relating to the frame information are registered are stored in the storage means.

The laser marking device 20 includes a laser irradiation device 210 for outputting laser light for marking on a lens, a lens holding device 220 for holding the lens at a predetermined position, and a laser for controlling the laser irradiation device. And a control computer including irradiation device control means 231 and lens holding device control means 232 for controlling the lens holding device.

As shown in FIG. 5, in the laser irradiation apparatus 210, the spot of the diverging laser light or the parallel laser light 212 emitted from the laser oscillator 211 is enlarged by the beam expander 213. Iii), the direction is changed by the pair of reflecting plates 214, 215, and the predetermined marking position of the convex surface 1A in the spectacle lens 1 with a condenser lens (e.g., f? Lens) 216. Condensed and irradiated to focus on. Further, roneun laser oscillator 211, for example, focal length 145㎜, laser oscillation is CO ₂ laser class 4, the outgoing laser output is maximum 30W, 12W average, the CO ₂ laser oscillation of the light-emitting peak wavelength 10.6㎛ Use what you do. The laser beam is controlled by, for example, a printing method using a galvano scanning method, a printing range of 90 mm × 90 mm, a character size of 0.2 to 90 mm, and a scanning speed of 3000 mm / s. do.

One of the pair of reflecting plates 214 and 215 is for the X direction, and the other is for the Y direction. By controlling the attitude | position of these reflecting plates 214 and 215, it can scan arbitrarily in the predetermined range (for example, 90 * 90mm range). Thereby, a laser beam can be irradiated to arbitrary positions on the concave surface of the spectacle lens 1, and various marks, such as a character and a figure, can be carved on a lens. In addition, it is preferable to move the lens so that the marking position is directly under the laser so that the marking is performed in that the laser irradiation direction with respect to the lens does not change regardless of the marking position.

The lens holding device 220 has a lens support cylinder 221, and a lens is placed on the lens support cylinder 221, and the inside of the lens support cylinder 221 is made negative by a vacuum pump (not shown). The central portion of the concave surface 1B in the spectacle lens 1 is adsorbed and held, and the spectacle lens 1 is provided in the laser marking device. Moreover, in order to facilitate attachment / detachment of a lens, it is comprised so that a movement is possible between a laser irradiation position and a lens attachment / detachment position not shown. In addition, the lens holding device is configured such that the height can be changed by a height adjustment means (not shown) so that the height of the position at which the visible mark is given at the lens irradiation position can be matched to the focal length of the laser irradiation device. 15 is another example of the lens holding apparatus. In this case, the lens is held in advance by attaching the lens to the lens holder 640 and attaching the lens holder to the lens holder 600. The lens holder 640 has a lens holder 641 for holding a lens, and an attachment portion 642 for a lens holding device installed on the opposite side to the side where the lens of the lens holder 641 is held. Doing. The fixing of the lens to the lens holder may be performed by providing a lens holding mechanism on the holder of the lens, or may be bonded by an adhesive means such as a double-sided tape.

The laser irradiation apparatus control means 231 is a means for controlling the laser irradiation apparatus 210, and controls the laser output value, the scanning speed, the laser irradiation position, the scanning direction, the number of overlapping markings, and the like. The lens holding device control means 232 controls the suction and release control by the lens support cylinder, the movement between the lens detachable position and the laser irradiation position of the lens holding device, and the movement for height adjustment of the lens holding device. Moreover, you may have X-Y control and rotation control function of a lens position. By having such a function, it becomes possible to automate positioning. Moreover, the marking which moved the marking position just under the laser becomes easy.

Various processing apparatuses include a grinding apparatus 81 for cutting and grinding an unfinished optical surface of a lens blank, a polishing apparatus 82 for polishing a cut or ground optical surface, and an edging or weak edge processing of a lens according to the order content. Circumferential processing apparatus 83, inspection apparatus 84, and other block devices not shown. In addition, the functions of the various computers and network devices may be appropriately integrated and distributed.

(Manufacturing method of the plastic eyeglass lens)

Next, the manufacturing method of a plastic spectacle lens is demonstrated. In FIG. 6, the spectacles retailer 60 inputs the prescription value and layout information of the wearer (buyer), the information of the spectacle lens or spectacle frame to be ordered, and the information about the visible mark imprinted on the surface of the spectacle lens into the ordering terminal. And transmit to the factory side through the communication medium. An example of the order screen for inputting the information on the visible mark at this time is as shown in FIG. 7.

On the factory 80 side, the order data sent from the ordering terminal 61 is received by the program registered in the main control computer 30 (S1). Then, order processing is started based on the sent order data (S 2). In the order processing, first, the order data is stored as the order data in the storage means of the data server. The order data includes lens designation data for a specified spectacle lens, frame designation data for a specified spectacle frame, prescription data for a prescription value, layout data for layout information, mark designation data for a specified visible mark, and the like. The lens designation data includes information on the lens type (lens material, refractive index, optical design of the front and rear surfaces of the lens, lens outer diameter, lens color, coating, product identification code for recognizing them), and information on lens processing instructions ( Lens thickness, kovar thickness, eccentricity, method of completing the rim surface, type and method of lens processing of the mounting portion, and the like.

The frame designation data includes frame size, frame material, color, lens cut shape (lens frame shape measured by frame shape measuring device or preset jade shape), and a product identification code for identifying them. Prescription data includes S frequency, C frequency, prism, subscription degree, axis, and the like. The layout data includes interpupillary distance (circular pupil distance), near pupil space distance, SEGMENT jade position, eye point position (optical center position, fitting point position, far end optical center position, etc.), prism measurement. Reference point position, and the like. The mark designation data includes the type of mark, the size of the mark, the lens that marks the mark among a pair of left and right lenses, the marking position of the mark, and the marking condition of the mark.

Next, based on these order data, the spectacle lens processing design program registered in the main control computer 30 creates the design data of the lenses of the ordered contents and stores them in the data server (S 3). At this time, it is also determined whether the lens of the order contents can be manufactured, and if it cannot be manufactured, the terminal side is urged to correct the order data. In the case where it is determined that it can be manufactured, the lens cut shape on the uncut lens required for marking acceptance determination and positioning is calculated next, and the result is stored in the data server (S4). Subsequently, based on the order data and the lens cut shape data, it is judged whether or not the mark can be imprinted, and if it can be imprinted, the mark position is determined (S5). This judgment and positioning will be described later. If it is determined that marking of the mark is impossible, the result is sent to the terminal side to prompt the correction of data. If the location is determined, the location is transmitted to the terminal to prompt confirmation. If the terminal approves the contents of the order and the marking, the order is confirmed there (S 6). When the order is confirmed, the spectacle lens processing design program also creates lens processing data (processing design values, various device setting values, use jigs, and other processing conditions) in each manufacturing process and is stored in the data server (S 7). In addition, marking processing data for controlling the laser marking apparatus is created and stored in the data server (S8). At the time of generating the marking processing data, the height of the lens holding device at the mark position determined in S 5 may be calculated based on the shape data of the lens. It may be added to.

In the factory, a lens blank having an optically incomplete surface is prepared in advance and stocked (S 9, S 10). This lens blank is a lens having a thickness of cutting and grinding margins or polishing margins for cutting and grinding processes and polishing processes after several weeks. The lens blank to be used is selected based on the design data and the processing data created in S 3 and S 7, and the two surfaces of the lens are more optically completed by cutting, grinding and polishing the unfinished surface (S 11 ). According to the order content, a dyeing process is performed as needed (S12), and a hardcoat film is formed in the surface of a lens by the hardcoat process (S13) after that.

The lens on which the hard coat film is formed proceeds to the next marking process, and the lens is marked based on the marking processing data of this lens created in S 8 (S 14). The detail of this marking process is mentioned later. In the lens to which the mark is applied, an antireflection film is formed on both surfaces of the lens in the next antireflection step (S15). A water repellent coat, a water discoloration prevention coat, an antifouling coat, a mirror coat and the like are applied to the antireflection film on the basis of the order data as necessary (S 16). After that, the lens is moved to the inspection process, and the optical characteristics and various thin film states are inspected (S 17), and then cut (edge) into a predetermined jade shape by the following edging process (S 18), and the frame is ordered. If not, if the lens is also ordered by matching the frame, the lens is installed in the frame (inserted into the frame (S 19)) and shipped (S 20).

In the case of a short focal lens, since the direction of the lens cannot be specified, a marking capable of specifying the rotational direction position on the lens after the hard coat and before marking may be performed based on this display. In addition, in order to further improve the visibility of the mark, the concave portion may be dyed. In this case, a laser is irradiated in the state which apply | coated the dye to the part to mark after hard-coat, a dye is fixed, and the extra dye may be wiped off after laser irradiation.

(Marking method)

Next, the marking method for forming the visible mark of step S 14 in the above-described plastic spectacle lens manufacturing method will be described. 8 is an explanatory diagram of a method of marking a mark that can be visually recognized by laser marking. In FIG. 8, the lens for focal position alignment which comprises a part of laser irradiation apparatus opposes the plastic lens 1 which is a marking object in this embodiment. The plastic lens 1 is formed by laminating a hard coat film 4 on the surface of the red substrate 3.

In the laser marking method of this embodiment, the diverging laser light or the parallel laser light L is focused on the surface P of the plastic lens 1 or the point P near the surface by the focusing lens 2 and focused. The concave portion in which the hard coat film 4 and the lens base material 3 on the surface of the lens base material are melt-evaporated by heat by the energy of the laser light L, and the hard coat film 4 is removed from the surface of the lens base material 3. (6) is formed. Thereafter, the antireflection film 5 is formed on the surface of the lens base material. As a result, spectacle lenses as shown in Figs. 1 to 3 are obtained.

According to the laser marking method, as shown in Fig. 3, the position where the laser is irradiated on the surface of the lens substrate 3 is melt-evaporated in an instant to form the concave portion 6. For this reason, when light from outside or the lens transmission light is irradiated to this concave-shaped part, light will scatter and it will be visible from the outside, and will act as a mark. In addition, the plastic near the surface of the concave portion is deteriorated by heat, and the refractive index, the transmittance, and the like are different from those of other parts, and the optical properties such as the refractive index and the transmittance are also considered to affect the visibility of the mark. .

3, the periphery of the concave portion 6 is larger than the lens surface, but this shows a state in which the lens substrate is deformed and expanded by the heat of the laser. Since the antireflection film is coated after the concave portion is formed in this manner, the antireflection film is formed on the surface of the lens substrate on the surface of the concave portion. For this reason, there is no possibility that an antireflection film may be damaged as in the case of laser marking after the antireflection film coating. Further, as in the case of conventionally irradiating a laser into the lens, it is not necessary to position the focus of the laser inside the lens, so that marking is easy and a mark with high visibility can be easily formed. Next, the operation sequence of marking process S14 is demonstrated with reference to FIG. 16 and FIG. In addition, in the following description, the height of a mark position is a case where it measures by the actual measurement, and the lens holding apparatus of a laser marking apparatus is a case provided through the lens holder shown in FIG.

First, design data, processing data, marking processing data and orders created by the design data creating means 32, the processing data creating means 33, the marking processing data creating means 33, and the lens cut shape calculating means 35. On the basis of the data, a lens layout chart is produced by a computer and outputted (S 301). In this layout chart, information for specifying the mark position on the uncut lens (lens cut shape, eye point position, positioning reference point, frame center, mark position, horizontal center line and vertical center line, etc.) is displayed in full scale. have. In addition, the vertical center line is a line at the same distance from two vertical tangents circumscribed to the lens cut shape, and the horizontal center line is a line at the same distance from two horizontal tangents circumscribed to the lens cut shape, The frame center is the intersection of the vertical center line and the horizontal center line. In addition, the positioning reference point is, for example, an eye point (optical center) in a single focus lens, an eye point (fitting point) or a prism measurement reference point in a progressive refractive lens, and a jade in a multifocal lens. ) Is the starting point of the shape. The uncut lens is provided with an indication for specifying the positioning reference point or the horizontal direction of the lens in advance, and the uncut lens is placed on the layout chart by aligning the layout chart and the positioning reference point of the uncut lens with the alignment. Put it on. The layout chart is also identified by marking on a position on the lens corresponding to the mark position on the layout chart (S302). A lens in which the mark position is specified is installed in the lens holder (S 303). The height of the mark position of the lens provided with the lens holder is measured by the mark position height measuring device (S 304). This mark position height measuring apparatus and measuring method are demonstrated with reference to FIG.

The mark position height measuring device holds the measuring table 601, the holding fixture placing table 630 provided on the measuring table 601, the dial gauge 620 serving as the height measuring means, and the dial gauge 620. And a stand 610 installed on the measuring table 601. The holder mounting base 630 mounts the lens holder 640 in which the lens 1 is installed, and the stand 610 includes a magnet base 611 fixed to the measuring stand 601 and the magnet. The rod 612 installed in the base and the arm 613 provided by the joint 614 so that angle or height can be adjusted to this rod 612 are provided. And the dial gauge 620 is provided in the front-end | tip part of this arm 613. The dial gauge 620 is provided with a freely stretchable measuring device 622, the tip of the measuring device is in contact with a measurement site such as the mark position 660, and the height change position by the degree of expansion and contraction of the measuring device 622, The measurement value is displayed on the display unit 621. Thereby, the mark position height 650 is calculated | required. In addition, the measuring device is provided with a handle 623 so as to manually operate the expansion and contraction during measurement. Moreover, this height measuring means is not limited to this, You may use a rags, a non-contact sensor, etc.

The lens holder 640 has a lens holder 641 for mounting and fixing the lens 1 in a state in which the concave side of the lens is in a downward direction, and on the opposite side from which the lens of the holder 641 is installed. The mounting part 642 provided is provided. This mounting portion 642 is also used to install the lens holder 640 in the lens holding device 600 (see Fig. 15) of the laser marking device. The surface around the mounting portion 642 has a surface in contact with the lens holding device 600, and this surface becomes a reference position 643 for height measurement. The holder mounting base 630 has a surface in contact with the upper surface of the measuring table 601 and a surface in contact with the height reference plane 643, and these surfaces are formed in parallel at predetermined intervals, and thus the height reference plane ( 643) can be measured at the 0 position (origin) to measure the height of any point of the lens convex surface. In order to measure the mark position 660 by this measurement position, the lens 1 with the lens holder 640 is placed in contact with the height reference plane on the holder holder 630, and the mark of the lens 1 is placed. The holder mounting table 630 is disposed on the measuring table 601 at a position where the position 660 and the tip of the measuring member 622 contact each other. The tip of the measuring member 622 is brought into contact with the mark position 660 of the lens 1 to measure the height 650 from the height reference plane 643. In this way, when the lens is mounted on the lens holder 640 used for mounting to the laser irradiation apparatus, and the height of the mark position 660 is measured based on the lens holder 640, the lens is held. Irrespective of the processing method (direction, height), since the height at the time of being installed in a laser irradiation apparatus can be measured correctly, it is preferable. In particular, even in a lens in which the outer periphery of the rear surface of the lens is not on the same plane and the lens installation direction is not stable, the installation state of the lens at the time of measurement and laser irradiation can be made the same.

When the height of the mark position 660 is measured as mentioned above, the measured value is registered in marking processing data (S305). Remove the lens with holder from the mounting table. In addition, the lens holder is installed in the lens holding apparatus while the lens holding apparatus 600 is moved to the lens attaching position (S 307). Then, the lens holding device is moved to the laser irradiation position (S 308). Based on the height measurement value of the registered mark position 660, the height of the lens holding apparatus 600 is adjusted so that the mark position 660 is at the height of the focal length of the laser irradiation apparatus (S 309). And it marks based on marking processing data (S310). After the marking is finished, the lens holding device 600 is moved to the detachable position to remove the lens with the holder, and the lens is removed from the holder (S 312). The position and visibility of the formed visible mark are checked (S 313), and if there is no problem, the process moves to the next manufacturing process. In addition, you may apply | coat a dye to a mark position before laser irradiation (S306), and may irradiate a laser. In this case, the dye can be fixed to the stamped portion to improve the visibility. In this case, the excess dye remaining on the lens after marking may be wiped off.

(Marking whether to mark or not)

(Example 1)

Next, the marking acceptance determination and marking positioning process of step S5 in the above-described plastic spectacle lens manufacturing method will be described in detail with reference to FIGS. 9 and 14. First, the data necessary for marking acceptance determination and marking position determination are drawn from the data server 40 to the main control computer 30, and is passed to the marking acceptance determination position determination means (S 101).

The data items necessary for these determinations and positioning are frame designation data 413, layout data 412, mark designation data 415, lens designation data 414, and the like. As the frame designation data 413, lens holding members protruding on the lens optical surface side in frameless glasses such as lens octagonal data (e.g., frame shape expressed by a 1 degree pitch radius with the frame center at the origin) and three-piece The position of the lens holding member, if present, and the area protruding from the optical surface when viewed from the front (e.g., in the case of a three-piece, the projection region is centered around this position with the center of the fixing screw as the position). Coordinates), frame types such as frames and frameless. As another example of the lens holding member, an impervious hole is formed in the lens edge surface as in glasses disclosed in Japanese Patent Laid-Open No. 7-230062, and a pin-shaped protrusion of the lens holding member is inserted therein. And notches (grooves) are provided inward from the lens rim surface, such as glasses described in Japanese Patent Laid-Open No. 2002-14303, and a lens holding member is fitted therein. Also in the case of such a lens holding member, the area | region which protrudes in the optical surface when it sees from the lens front surface is represented by XY coordinate. The layout data includes a mark non-granting area reference position (for example, XY coordinates based on the frame center), and a mark non-printing area (for example, non-granting area reference position) determined based on the mark non-printing area reference position. Within 30 mm diameter). In addition, it is preferable to use an eye point position (optical center) for a monofocal lens, a prism measurement reference point for a progressive refractive lens, and a circular eye point (far optical part optical center) for a multifocal lens as a non-implantation region reference position. .

In addition, the mark designation data 415 includes an angle of the mark (for example, an angle with respect to an outer horizontal line centered on the frame center) 522, a mark inward direction position (a lens cut shape edge in the mark angle direction). 521), a search range (for example, a range specified by an angle before and after the mark angle, a range set in the region based on the mark position) when it is determined that the point for which the marking is determined or not is not marked. Etc.). The lens designation data 414 is used as a design data of the optical surface of the lens, for calculating the position in the height direction of the laser engraving position, and matching the holding position of the lens with the focal length of the laser beam accordingly.

Next, the mark non-applying area is calculated (S 102). This calculation is based on the mark non-implanted area reference position of the lens (optical center for short focal lenses. Faraway optical center for multifocal lenses. For progressive refractive lenses, an area of a predetermined condition relative to the prism measurement reference point position. As conditions, it shall be within 30 mm in diameter from a mark non-improvement area reference position, for example.

Next, the priority of the mark position search is determined (S 103). This specifies how to find the next check position when the result of the marking acceptance decision is disabled, and may be determined in advance. For example, the search is performed by moving 1 degree upward from the first designated mark angle, and searching by shifting 1 degree downward from the first designated mark angle when it is not visible from the top.

When the data necessary for marking is prepared, the mark position search is started (S 104). First, the marking position is calculated based on the cut shape in the uncut lens calculated in advance and the frame center and mark designation data specified by the cut shape (for example, the lens cut shape by the mark angle and the mark inner position). Mark position at is calculated). Then, it is determined whether or not the position is within the mark non-applying area on the basis of the mark non-applying area reference position (S 105).

If the mark position is in the mark non-applying area, marking is disabled and the process moves to step S 110 of the next mark position candidate search. If it is determined that it is not within the marking non-applying area, it is determined from the frame type data whether the lens holding member protrudes from the optical surface (S 106), and if there is a lens holding member protruding from the lens optical surface, it does not overlap with the mark from the front. It is determined whether or not it is (S107). In the case of overlapping, the marking is disabled and the flow moves to step S110 of the next mark position candidate search.

In the case of not overlapping, the position is determined as the mark position. If it is determined in S 106 that there is no lens holding member protruding from the optical surface, the mark position is determined without performing a lens holding member position check. Once the mark position is determined, the coordinates of the mark position are sent to the main control computer to create the marking machining data.

If it is disabled in the mark non-applying region check and the lens holding member position check, the next mark position is determined in accordance with the mark position detection priority setting determined in S 103 in the processing of the next mark position candidate search (S 110). If the candidate is found and its position is within the mark search range of the mark specifying data, it is determined as the mark position candidate. If the mark position candidate is not visible in the mark search range even when searching by the mark position search priority setting, no mark candidate is assumed. It is determined whether or not there is a mark position candidate (S 111). If there is no mark candidate, it is determined that the mark is impossible (S 112) and an error code is output. If there is a rear part, the flow advances to a mark non-applying area check (S 105). The above process is repeated until the mark position is determined or the mark cannot be determined.

Specifically, the mark positioning is performed as follows, for example. That is, the example shown in FIG. 14 is a case where a mark is given to the frameless glasses 500. The frameless glasses 500 have left and right lenses 501 and 502, bridges 504 connecting them, edges 503 provided on both outer sides of the lens, and not shown, connected to the edges by hinges. The temple is made of. In this example, the mark is imprinted on the lens on the left, the position of the mark angle 522 is 30 degrees above the ear toward the frame center 530, and the mark inside position 521 is 3 mm from the lens cover surface. to be. The lens is a short focal lens. The mark non-applying region reference point 511 is the optical center of the lens, and the mark non-applying region 510 is within 30 mm in diameter. Since the glasses are frameless glasses, the lens holding portion 505 is located on the lens optical surface. For this reason, in mark positioning, the area of the visible mark is set at a position which does not overlap the mark non-applying area 510 and the lens holding part area 506.

(Example 2)

Another example of the marking acceptance determination and marking positioning process will be described in detail with reference to FIGS. 18 and 19. The main difference from the above-mentioned specific example 1 is that the mark setting data 415 sets the mark vertical direction position B (the distance from the edge of the lens cut shape to the mark center in the vertical direction), and the marking availability decision. It is a point to check the position value of this mark in the vertical direction in the mark. In addition, a search in the frame center direction is added as a mark position search condition. The lens holding member protruding on the lens optical surface side will be described as a case where a notch (groove) 740 is formed inward from the lens rim surface and the lens holding member is fitted to the notch.

First, the data necessary for marking acceptance determination and marking position determination are drawn from the data server 40 to the main control computer 30, and transferred to the marking acceptance determination position determination means (S 201). In this example, the main data of the items necessary for the judgment and position determination are as follows.

(Frame designation data)

Lens holding part area 706: the rectangular area of the width C around the center line 741 of the notch, the depth D from the intersection of the center line 741 of the notch and the lens cut shape.

(Layout data)

Unmarked area 710: Within 30 mm in diameter around the unmarked area reference position 711.

(Mark designation data)

Mark angle θ : 30 degrees upward from the outer horizontal line centered on the frame center 730

Mark position direction (A): 3 mm or more (4 mm from the tip of the weak edge when forming a weak edge on the lens edge)

Mark vertically inward direction B: 3 mm or more (4 mm from the tip of the weak edge when forming a weak edge on the lens edge)

Mark area 723: 3 mm in diameter from mark center 720

Search range: Mark angle ± 30 degrees

Priority Ⅰ: Search in the frame center direction (0.5mm move search)

Priority Ⅱ: Search in mark angle plus direction (up direction) (1 degree shift search)

Priority Ⅲ: Mark angle search in minus direction (downward direction) (1 degree shift search)

When the data necessary for marking is provided, the mark position search is started (S204). First, the marking position is calculated based on the lens cut shape in the uncut lens calculated in advance, the frame center specified by the lens cut shape, and the mark designation data. Calculation). Then, it is judged whether or not the position is within the mark non-applying area on the basis of the mark non-applying area reference position (S205). If the mark position is in the mark non-applying area, marking becomes impossible and the process moves to the next mark position candidate search step. If it is determined that it is not within the marking non-providing area, it is determined whether or not the mark vertical direction direction B is equal to or larger than the above value (S206). If the mark vertical direction B is not equal to or larger than the above-mentioned value, it becomes impossible to mark and moves to the next mark position candidate search step. If the value is equal to or larger than the above value, it is determined whether or not the lens holding portion protrudes from the lens optical surface (S 207). If there is a lens holding member, it is determined whether the mark region and the lens holding portion region do not overlap (S 208). . In the case of overlapping, it becomes impossible to mark and moves to the next mark position candidate search step. In the case of not overlapping, the position is determined as the mark position. If it is determined in S 207 that there is no lens holder protruding from the lens optical surface, the mark position is determined without performing lens holder position check. Once the mark position is determined, the coordinates of the mark position are sent to the main control computer to create the marking data.

If it is disabled by the mark non-applying area check, the mark vertical direction check, and the lens holding part check, then the mark position search priority setting that is set in advance is set in the next mark position candidate search process (S 211). The next mark position candidate is searched accordingly, and if the position is within the mark search range of the mark designation data, it is determined as the mark position candidate. In this example, the search is not first performed in the frame center direction I, and if the next mark candidate is not visible outside the non-applying region, the search is performed in the plus (+) direction II of the mark angle from the first mark position. If the next mark candidate is not visible, the search is performed in the negative (-) direction III of the angle from the initial position. It is determined whether there is a mark position candidate (S 212). If there is no candidate, it is determined that the mark is impossible (S 213) and an error code is output. If there is a candidate, the flow advances to the mark non-granting area check (S205). The above process is repeated until the mark position is determined or if the mark cannot be determined. In this example, since the mark vertical direction position is set, the mark is not located near the edge of the lens even if the mark position direction condition is satisfied depending on the lens shape.

(Marking specific example)

Next, the example actually marked by the plastic spectacle lens manufacturing method which concerns on embodiment mentioned above is demonstrated.

Marking Embodiment 1

(A) Formation of Lens Base Material and Hard Coat Film

A plastic lens (CR-39) having a refractive index of 1.499 containing 99.7% by weight of diethylene glycol bisaryl carbonate as a main component and 0.03% by weight of 2-hydroxy-4-n-octoxybenzophenone as a ultraviolet absorber was used. . This plastic lens was immersed and cured in a coating solution containing 80 mol% of colloidal silica and 20 mol% of γ-glycidoxy propyltrimethoxy silane to form a hard coat layer (refractive index of 1.50).

(B) laser marking

The laser was irradiated to the lens in which the said hard-coat layer was formed on the laser marking conditions (A1-A9) shown in FIG. The mark to mark is the same mark "H" as shown in FIG. 1 and FIG. 2, and a magnitude | size is 2 mm angle.

(C) Formation of Anti-Reflection Film

The plastic lens having the hard coat layer was heated to 80 ° C, and an underlayer (refractive ratio 1.46, film thickness) consisting of SiO ₂ on the hard coat layer by vacuum deposition (vacuum degree 2 × 10 ^-5 Torr). 0.5λ (λ is 500 nm)].

Next, a Ta ₂ O ₅ powder, a ZrO ₂ powder, a Y ₂ O ₃ powder, and an Al ₂ O ₃ powder were mixed, pressurized at 300 kg / cm 2, and then sintered at a sintering temperature of 1300 ° C. (molar ratio: Ta ₂ O ₅ -ZrO ₂ -Y ₂ O ₃ -Al ₂ O ₃ = 1.3: 1: 0.5: 0.1, Al ₂ O ₃ content 1.26 wt%) Mixed layer formed by heating the electron total output current 170mA (refractive index 2.08 And a first low refractive index layer made of a SiO ₂ layer (refractive index 1.46, film thickness 0.086λ) and a SiO ₂ layer. On this first low refractive index layer, a four-component photorefractive index layer (refractive index 2.08, film thickness 0.5λ) is formed of the same deposition composition as the vapor deposition composition, and a second low refractive index layer (refractive index 1.46, film) composed of SiO ₂ is formed on the layer. A thickness of 0.25λ) was further formed to obtain a plastic lens having an antireflection film. The low refractive index layer and the high refractive index layer were formed by the same vacuum evaporation method in which the base layer was formed.

Marking embodiment 2

(1) Formation of Lens Base Material and Hard Coat Film

142 parts by weight of gamma -glycidoxy propyltrimethoxy silane, which is an organosilicon compound, was added to the glass container, and 1.4 parts by weight of 0.01 N hydrochloric acid and 32 parts by weight of water were added dropwise thereto. After completion of the dropwise addition, stirring was performed for 24 hours to obtain a hydrolysis solution of γ-glycidoxy propyltrimethoxy silane. 460 parts by weight of stannic oxide-zirconium oxide complex sol (methanol dispersion, 31.5% by weight of all metal oxides, average particle diameter of 10 to 15 millimeters), 300 parts by weight of ethyl cellosolve, silicone-based as lubricant After adding 0.7 weight part of surfactant and 8 weight part of aluminum acetyl acetate as a hardening | curing agent, and fully stirring, it filtered and obtained the coating liquid.

The plastic lens base material [manufactured by H0YA Co., Ltd., a plastic lens for eyeglasses (trade name: EYAS), a refractive index of 1.60] pretreated with an aqueous alkali solution was immersed in the coating solution, and after completion of the immersion, the pulling speed was 20 cm / min. The pulled plastic lens was heated at 120 ° C. for 2 hours to form a hard coat layer.

(2) laser marking

The laser was irradiated to the lens in which the said hard-coat layer was formed on the laser marking conditions (B1-B9) shown in FIG. The mark marked is the same mark "H" as shown in FIG. 1 and FIG. 2, and a magnitude | size is 2 mm angle.

(3) Formation of antireflection film

The plastic lens having the hard coat layer was heated to 80 ° C., and a base layer (refractive index of 1.46 and a thickness of 0.5λ (λ) of SiO ₂ was formed on the hard coat layer by vacuum deposition (vacuum degree 2 × 10 ⁻⁵ Torr). 500 nm).

Next, a Ta ₂ O ₅ powder, a ZrO ₂ powder, a Y ₂ O ₃ powder, and an Al ₂ O ₃ powder were mixed, pressurized to 300 kg / cm 2, and deposited by sintering at a sintering temperature of 1300 ° C. (molar ratio: Ta ₂ O ₅ -ZrO ₂ -Y ₂ O ₃ -Al ₂ O ₃ = 1.3: 1: 0.5: 0.1, Al ₂ O ₃ content 1.26% by weight of the mixed layer formed by heating the electron total output current 170 mA (refractive index 2.08, A first low refractive index layer consisting of a film thickness of 0.118 lambda) and a SiO ₂ layer (refractive index of 1.46, film thickness of 0.056 lambda).

On this first low refractive index layer, a four-component light refractive index layer (refractive index 2.08, film thickness 0.25λ) is formed of the same deposition composition as the vapor deposition composition, and a second low refractive index layer (refractive index 1.46, film) composed of SiO ₂ is formed on the layer. A thickness of 0.25λ) was further formed to obtain a plastic lens having an antireflection film. The low refractive index layer and the high refractive index layer were formed by the same vacuum evaporation method in which the base layer was formed.

Next, both parts of the formed mark will be described.

Criteria for judging the quality of marking

(a) visibility

Inspectors 1 and 2, which performed laser marking, placed the lens such that the mark for evaluating visibility under normal fluorescent lighting was placed on the human face skin, and inspected whether the mark could be seen from a position 60 cm away from this lens. Judging by the eyes of. The judgment criteria are as follows.

A: satisfactory level

B: Somewhat satisfactory level

C: Unsatisfactory level

This evaluation result is shown to FIG. 10 and FIG.

(b) sharpness

The lens (1) and (2) subjected to laser marking are placed so that the mark for evaluating visibility under normal fluorescent lighting is placed on the human skin, and the content of the mark from a position 20 cm away from the lens. It was determined by the eyes of the inspector whether it was read. The judgment criteria are as follows.

A: satisfactory level

B: Somewhat satisfactory level

C: Unsatisfactory level

This evaluation result is shown to FIG. 10 and FIG. In addition, in FIG.10 and FIG.11, what is in the output (%) in a laser marking condition is% display with respect to 30 W of maximum outputs.

The results of the evaluation were as shown in FIGS. 10 and 11. In this case, under the conditions of A1, B1, and B2 where evaluation was C, the existence of the mark could not be sufficiently confirmed from the position 60 cm apart, and the contents of the mark could not be read even from the position 20 cm apart. Moreover, under the condition of B2, although the presence of a mark could be confirmed at some distance from the position 60 cm away, the content of the mark could not be read also from the position 20 cm away. Under the conditions other than the above, in both cases, visibility and clarity were good.

Marking status

12 and 13 show the uneven state of the surface of the plastic lens 1 after the laser light is irradiated under the conditions A3, A5, A7, B3, B5, and B7 to perform marking. In addition, A0 and B0 of FIG. 12 have shown the uneven state other than a mark part.

FIG. 12 and FIG. 13 show the surface of a plastic lens scanned by a Lanck Hobson Taylor company (Talysurf) and measured the line width and depth of the mark. In the figure, the concave portion is evaporated by a laser beam, and the concave portion is formed on the surface, and it is considered that the concave portion generates a visual action as a mark. In addition, the inclination of each graph was because the lens was slightly inclined at the time of measurement. In addition, as shown in (A0) and (B0), no concave portion is naturally formed except the mark portion.

10 and 11 show the results of calculating the width and depth of the concave portion based on the measurement results. In addition, as shown in FIG. 3, the width W is measured in the space | interval of the position which started to dig from the lens surface, or the highest position on both sides of a concave-shaped part. In addition, the depth is D2 as the depth from the surface which is not expanded, and the depth from the highest position of the protruding part of both sides of a concave-shaped part is set to D1. As can be seen from this result, when the depth of the concave portion is shallow as in (A3) and (B3), it is understood that visibility and sharpness are slightly deteriorated.

The present invention can be used for obtaining a plastic spectacle lens in which a mark having good visibility is formed at a position where it is difficult to obstruct the field of view and not removed when cut.

According to the above means, it is possible to form a mark having good visibility without damaging a thin film such as an antireflection film. In addition, a mark with good visibility can be formed at a position where it is difficult to obstruct the visual field and at a position that is not removed when it is cut.

Claims (15)

A plastic spectacle lens having a hard coat film and an antireflection film on a surface of a lens base material, wherein the plastic spectacle lens is provided with a mark that can be visually recognized from the outside in a position that does not interfere with a watch. In the mark, the hard coat film is removed with respect to the portion constituting the mark, and a part of the lens base material is removed from the surface to form a concave shape with only a small amount removed from the surface. The anti-reflective film is formed in the cross section of a desired part and the surface of the concave part of the said lens base material, and can be visually recognized from the exterior, The plastic spectacle lens characterized by the above-mentioned. The method of claim 1, The concave portion has a depth of 5 µm or more and a width of 90 µm or more. The method according to claim 1 or 2, A plastic spectacle lens, wherein a water repellent film is formed on the anti-reflection film. In the marking method of giving a mark to a plastic spectacle lens, A hard coat film is provided on the plastic spectacle lens base material, Next, while removing the hard coat film in the form of the mark, the hard coat film and a part of the substrate are further removed so that a recess of a predetermined depth is formed in the substrate itself, Next, the marking method which forms the mark which can be visually recognized from the outside by providing an anti-reflective film on the surface of the said hard-coat film and the surface of the recessed part of the said base material. The method of claim 4, wherein The depth of the said concave part is 5 micrometers or more, and the marking method characterized by the above-mentioned. The method according to claim 4 or 5, The marking method is characterized in that the formation of the recess is performed by laser irradiation. The method according to any one of claims 4 to 6, And the mark is formed outside of a predetermined area based on an eye point or a prism measurement reference point. The method according to claim 6 or 7, A marking method, characterized in that the height of the mark applying position is measured before laser irradiation, and the laser irradiation is performed after the mark providing position and the focal length of the laser irradiation are adjusted based on the measured height. In the plastic spectacle lens manufacturing method of manufacturing a plastic spectacle lens by applying a predetermined processing to the plastic lens material, A plastic spectacle lens manufacturing method comprising the step of performing the marking by the marking method according to any one of claims 4 to 8. A marking device for marking a plastic spectacle lens, The lens cut shape information, eye point or prism measurement reference point position information, mark non-imparting area information that defines an area where no mark is given based on the eye point or prism reference point, and conditions for the position where the mark is given are determined. Means for calculating a mark granting position based on the mark designation information, The marking device calculates the mark assigning position as a mark assigning position at a predetermined position based on the mark designating information, and also determines a position not belonging to the mark non-providing region defined by the mark non-granting region information. . The method of claim 10, In the mark designation information, the mark position search priority in the case where a mark cannot be given is determined, and in the case where the mark cannot be attached, the mark position search priority is changed according to the mark position search priority to calculate the grant position. Marking device, characterized in that. The method of claim 10 or 11, The marking device is included in the mark designation information. The marking position is determined by the angle from the frame center and the distance from the outer periphery of the lens cut shape. The method of claim 12, And when the mark assigning position is not determined, the mark attaching position is calculated by sequentially shifting the angle according to the mark position search priority. The method of claim 12, And when the mark assignment position is not determined, the mark assignment position is calculated by sequentially moving the distance from the outer circumference according to the mark position search priority. The method according to any one of claims 10 to 12, And the mark applying position is arranged at a position which does not overlap with the region where the range holding member is located.

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