JP2014041098A - Coat film durability measurement method and coat film durability measurement device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coat film durability measurement method and a coat film durability measurement device that enable an accurate evaluation of durability of a coat film towards a deformation upon framing a spectacle lens into a frame.SOLUTION: A durability measurement method of a coat film 103 provided on a surface 102 which is different from a holding surface 101 included in a spectacle lens 100 and held to a frame body employs a method comprising: a first step of applying weight to the holding surface 101 along a first direction; a second step of detecting occurrence of a crack C in the holding surface 103 generated by the applied weight; and a third step of measuring at least one of magnitude of the applied weight when the crack C occurs, a first deformation amount in the first direction of the spectacles lens 100 generated by the applied weight thereupon, and a second deformation amount in a thickness direction of the spectacle lens 100 generated by the applied weight thereupon.

Description

  The present invention relates to a coating film durability measurement method and a coating film durability measurement apparatus.

  In general, a spectacle lens is shaved at a storefront or the like in accordance with the shape of a spectacle frame desired by a customer (hereinafter referred to as “lens shape processing”) and then put into the spectacle frame (hereinafter referred to as “frame”). ) use. Synthetic resin spectacle lenses are generally inferior in surface hardness to glass lenses, and therefore a surface is coated with a synthetic resin material having a hardness higher than that of the cloth. Patent Document 1 below discloses a method for evaluating the coating film adhesion performance of spectacle lenses.

  In this eyeglass lens coat film adhesion performance evaluation test method, (1) when the eyeglass lens is processed into a lens shape in accordance with the frame shape, an excessive load exceeding normal is applied to the lens chuck portion for holding the eyeglass lens. (2) When processing the eyeglass lens to match the frame shape, the lens processing is performed while applying an excessive grinding stone pressing load to the eyeglass lens edge, or (3) the eyeglass lens. When the frame is put into the frame, it is tightened with an excessive tightening force exceeding normal.

JP 2004-264209 A

  By the way, when the spectacle lens is framed in the frame, it is desirable that these coating films are not cracked. However, in reality, cracks may be generated when framed. Some spectacle lenses are prone to cracking depending on the product, and others are difficult to crack. Therefore, it is desired to provide a measurement method and a measurement apparatus for more appropriately evaluating the durability of the coating film against deformation during frame insertion.

  The present invention has been made in view of the above problems, and a coating film durability measuring method and a coating film durability measuring apparatus capable of appropriately evaluating the durability of the coating film against deformation during frame insertion. The purpose is to provide.

  In order to solve the above-described problems, the present invention provides a durability measurement method for a coating film provided on a surface different from the holding surface of a spectacle lens having a holding surface held by a frame. A first step of weighting the holding surface along the direction, a second step of detecting the occurrence of cracks in the coat film due to the weight, the magnitude of the weight at the time of occurrence of the cracks, and Measuring at least one of a first deformation amount in the first direction of the spectacle lens caused by weighting and a second deformation amount in the thickness direction of the spectacle lens caused by the weighting; The method of having a process is adopted.

  In the present invention, the second step employs a technique of detecting the occurrence of cracks in the coating film by image analysis.

  In the present invention, the second step employs a technique in which the occurrence of cracks in the coating film is detected by sound at the time of occurrence.

  In the present invention, a technique is adopted in which the coating film includes at least an antireflection film.

  In the present invention, a technique is adopted in which the spectacle lens has a target lens shape.

  In the present invention, a technique is adopted in which the first direction is the longitudinal direction of the spectacle lens.

  According to the present invention, there is also provided a coating film durability measuring device provided on a surface different from the holding surface of the spectacle lens having a holding surface held by a frame, wherein the holding is performed along a first direction. A weighting device for weighting the surface, a crack occurrence detection device for detecting the occurrence of cracks in the coat film due to the weighting, the magnitude of the weighting at the time of the occurrence of the crack, and the first caused by the weighting. And a measuring device that measures at least one of the first deformation amount in the direction 1 and the second deformation amount in the thickness direction of the spectacle lens caused by the weighting. .

  In the present invention, the crack occurrence detection device detects an occurrence of a crack in the coat film by performing an image analysis on an imaging camera that images the surface of the spectacle lens and image data acquired by the imaging camera. The configuration of having an image analysis device to be used is adopted.

  Moreover, in this invention, the said crack generation | occurrence | production detection apparatus employ | adopts the structure that it has an elastic wave detection apparatus which detects the sound at the time of the generation | occurrence | production of the crack of the said coating film.

  In the present invention, the coating film includes at least an antireflection film.

  Moreover, in this invention, the structure that the said spectacles lens has a target lens shape is employ | adopted.

  In the present invention, a configuration is adopted in which the first direction is the longitudinal direction of the spectacle lens.

  In the present invention, the measuring device may be a load cell that measures the magnitude of the weight, and a second lens that captures the spectacle lens from a first direction and a second direction orthogonal to the thickness direction. A configuration in which at least one of the imaging cameras is included is adopted.

According to the present invention, it is possible to simulate the load applied to the spectacle lens when putting the frame into the frame by applying a weight in the first direction to the holding surface held by the frame and deforming the spectacle lens. In addition, the magnitude of the weight, the amount of deformation in the first direction, and the amount of second deformation in the thickness direction when the surface coat film is cracked due to the deformation of the spectacle lens due to the weight are measured. Thus, these measured values can be used as a measure of the durability of the coating film in the framed operation of the spectacle lens, and appropriateness and risk for the frame of the spectacle lens can be evaluated.
Therefore, the present invention can provide a coating film durability measuring method and a coating film durability measuring apparatus capable of appropriately evaluating the durability of the coating film against deformation during frame insertion.

1 is an overall configuration diagram of a coating film durability measuring apparatus according to an embodiment of the present invention. It is a block diagram of a coat film durability measuring device in an embodiment of the present invention. It is a flowchart of the durability measuring method of the coat film in the embodiment of the present invention. It is a figure for demonstrating the durability measuring method of the coating film in embodiment of this invention.

  Embodiments of the present invention will be described below with reference to the drawings. In the following description, an XYZ orthogonal coordinate system may be set, and the positional relationship of each member may be described with reference to this XYZ orthogonal coordinate system. A predetermined direction in the horizontal plane is defined as an X-axis direction, a direction orthogonal to the X-axis direction in the horizontal plane is defined as a Y-axis direction, and a direction orthogonal to each of the X-axis direction and the Y-axis direction (that is, a vertical direction) is defined as a Z-axis direction.

FIG. 1 is an overall configuration diagram of a coating film durability measuring apparatus 1 according to an embodiment of the present invention. FIG. 2 is a block diagram of the coating film durability measuring apparatus 1 according to the embodiment of the present invention.
As shown in FIGS. 1 and 2, the coat film durability measuring apparatus 1 includes a coat film durability test apparatus 2 and a personal computer 3. The coating film durability measuring apparatus 1 of this embodiment is intended for a lens-shaped plastic spectacle lens 100.

  Here, the target lens shape is a shape as shown in FIG. 1 and is a shape in which the outer edge portion of the spectacle lens 100 is glazed according to the frame shape of a frame (not shown) to be attached. The spectacle lens 100 of this embodiment has a shape in which the width in the vertical direction (the Y-axis direction in FIG. 1) is smaller than the width in the longitudinal direction (the X-axis direction in FIG. 1) when used. The spectacle lens 100 has a holding surface 101 formed by target lens processing.

  The holding surface 101 is a portion that receives a load when the frame is put into the frame, and constitutes a side surface of the entire outer edge portion of the spectacle lens 100. The holding surface 101 is formed in a bevel shape or substantially perpendicular to the direction orthogonal to the direction in which the optical axis of the spectacle lens 100 extends (Z-axis direction in FIG. 1). A coating film 103 is provided on a surface 102 different from the holding surface 101 of the spectacle lens 100. The surface 102 is formed so as to be substantially perpendicular to the direction in which the optical axis of the spectacle lens 100 extends (Z-axis direction in FIG. 1), and has a convex shape on the front side and a concave shape on the back side.

The coat film 103 includes at least an antireflection film. The antireflection film has a function of preventing reflection on the surface 102 of the spectacle lens 100. Therefore, the spectacle lens 100 coated with this antireflection film has a characteristic of preventing the occurrence of ghost (virtual image) and flickering. The antireflection film can be formed by a known method using a known material. For example, a multilayer film (referred to as a multi-coat film) in which a low refractive index material such as SiO ₂ and a high refractive index material such as ZrO ₂ or TiO ₂ are alternately stacked is used for the antireflection film. Yes.

  Further, the spectacle lens 100 may have a configuration in which a hard coat film having scratch resistance is provided on the surface 102 in order to make it difficult to be damaged. Furthermore, a configuration in which a primer coat film for improving mutual adhesion or imparting impact resistance is provided between the surface 102 and the hard coat film. In addition, various functional films can be stacked on the surface 102.

As shown in FIG. 2, the coat film durability test apparatus 2 includes a weighting device 10, a first imaging camera (imaging camera) 11, a second imaging camera 12, and a load cell 13.
As shown in FIG. 1, the weighting device 10 is configured to load the holding surface 101 of the spectacle lens 100 along a first direction (X-axis direction in FIG. 1). In the present embodiment, the first direction, which is the weighting direction of the weighting device 10, coincides with the direction in which a load is applied when framed in the frame, that is, the longitudinal direction of the eyeglass-shaped spectacle lens 100. Yes.

  The weighting device 10 includes a fixed lens clamp 14 and a movable lens clamp 15. The fixed lens clamp 14 comes into contact with the holding surface 101 on one side (+ X side) of the spectacle lens 100 in the first direction. The fixed lens clamp 14 is fixed to the base 16 of the coating film durability test apparatus 2. The fixed lens clamp 14 of the present embodiment is a rigid block, but in order to improve clamp stability, for example, a groove that can hold the bevel of the spectacle lens 100, a rubber portion that can be deformed according to the shape of the spectacle lens 100, An arm unit that can hold the spectacle lens 100 may be provided. The same applies to the movable lens clamp 15 side.

  The movable lens clamp 15 comes into contact with the holding surface 101 on the other side (−X side) of the spectacle lens 100 in the first direction. The movable lens clamp 15 is movable relative to the base 16 of the coating film durability test apparatus 2 and is configured to be close to and away from the fixed lens clamp 14. The movable lens clamp 15 is guided by a guide rod 17. The guide rods 17 are arranged in parallel along the X-axis direction as a pair, and are configured to stably guide the movable lens clamp 15 along the first direction.

  The movable lens clamp 15 is connected to the motor device 18. The motor device 18 moves the movable lens clamp 15 in the first direction under the control of the control unit 20 (see FIG. 2). The motor device 18 of the present embodiment is configured to move the movable lens clamp 15 by a screw structure. Specifically, the movable lens clamp 15 has a screw hole 15a, and the motor device 18 has a screw 19 that is screwed into the screw hole 15a. For this reason, the movable lens clamp 15 can be moved along the first direction along the guide rod 17 by the rotation of the screw 19.

  The first imaging camera 11 images the surface 102 of the spectacle lens 100 clamped by the fixed lens clamp 14 and the movable lens clamp 15. The first imaging camera 11 is composed of a CCD camera, for example, and is arranged so as to capture the surface 102 of the spectacle lens 100 from the thickness direction of the spectacle lens 100 (Z-axis direction in FIG. 1). The first imaging camera 11 is for detecting the crack C of the coat film 103 due to the weighting of the weighting device 10, and constitutes the crack occurrence detecting device 4 together with the image analysis unit 24 (see FIG. 2). is there.

On the other hand, the second imaging camera 12 images the side surface of the spectacle lens 100 clamped by the fixed lens clamp 14 and the movable lens clamp 15. The second imaging camera 12 is composed of, for example, a CCD camera or the like, and has a second direction (the X-axis direction in FIG. 1) and a second direction (the Z-axis direction in FIG. 1) orthogonal to the thickness direction (the Z-axis direction in FIG. 1). The eyeglass lens 100 is arranged so as to image from the Y-axis direction in FIG.
The load cell 13 measures the magnitude of the weight in the first direction applied to the spectacle lens 100. The load cell 13 of this embodiment is provided on the movable lens clamp 15.

  The second imaging camera 12 and the load cell 13 constitute the measuring device 5 that measures the amount of deformation and the weight of the spectacle lens 100 when the crack C of the coat film 103 is generated by the weighting by the weighting device 10. . In the present embodiment, when the second imaging camera 12 images the XZ plane, the first deformation amount in the first direction (X-axis direction in FIG. 1) of the spectacle lens 100 caused by weighting, The second deformation amount in the thickness direction (Z-axis direction in FIG. 1) of the spectacle lens 100 caused by the weight is measured, and the load cell 13 measures the magnitude of the weight.

As illustrated in FIG. 2, the personal computer 3 includes a control unit 20, an operation unit 21, a display unit 22, a storage unit 23, and an image analysis unit 24.
The control unit 20 includes various input / output interface lines that exchange data with the internal memory, CPU, and other components, and controls the operation of the entire apparatus. The internal memory stores a control program. The CPU performs overall control of the other units by performing control calculations based on the control program, various control data, signals input from the operation unit 21 and the like.

The operation unit 21 includes a mouse, a keyboard, and the like (not shown in FIG. 1). The operation unit 21 receives an operation instruction for the personal computer 3 from the user, and outputs a signal corresponding to the operation instruction by the user to the control unit 20.
The display unit 22 includes a liquid crystal display, an organic EL display, or the like. The display unit 22 enables the user to monitor the captured image of the first imaging camera 11, the captured image of the second imaging camera 12, the transition of the measurement value of the load cell 13, and the like under the control of the control unit 20. For.

  The storage unit 23 includes an external memory, an HDD, and the like. The storage unit 23 stores various application software, drivers for controlling various hardware connected to the personal computer 3, various setting values, and the like. The storage unit 23 stores the image data acquired by the first imaging camera 11, the image data acquired by the second imaging camera 12, and the measurement data acquired by the load cell 13, for example, at predetermined sampling times. It has become.

  The image analysis unit 24 detects the occurrence of a crack C in the coat film 103 by analyzing the image data acquired by the first imaging camera 11. The image analysis unit 24 reads the image data acquired by the first imaging camera 11 stored in the storage unit 23 and performs predetermined image processing, thereby detecting the occurrence of a crack C in the coat film 103. For example, when the occurrence of a crack C exceeding a predetermined threshold (for example, size and range) is confirmed so that the crack C can be recognized by binarizing or pattern matching the image data, the crack The occurrence of C is detected.

Next, a coating film durability measuring method using the coating film durability measuring apparatus 1 having the above-described configuration will be described with additional reference to FIGS. 3 and 4.
FIG. 3 is a flowchart of the coating film durability measurement method according to the embodiment of the present invention. FIG. 4 is a diagram for explaining a method for measuring the durability of a coating film in the embodiment of the present invention. FIG. 4A is a diagram for explaining step S4 in the second step. Moreover, FIG.4 (b) is a figure for demonstrating step S5 concerning a 3rd process.

  As shown in FIG. 3, in step S <b> 1, the spectacle lens 100 is installed in the coat film durability test apparatus 2. Specifically, as shown in FIG. 1, the spectacle lens 100 is interposed between the fixed lens clamp 14 and the movable lens clamp 15. At this time, the spectacle lens 100 is installed so that the longitudinal direction thereof coincides with the moving direction of the movable lens clamp 15 (X-axis direction in FIG. 1). As a result, the direction of the load applied when the spectacle lens 100 is put into the frame can be matched with the direction of weighting by the weighting device 10.

  Next, in step S2, an initial value is acquired. Specifically, the image data of the first imaging camera 11 and the second imaging camera 12 in a state where the spectacle lens 100 is sandwiched between the fixed lens clamp 14 and the movable lens clamp 15 (before weighting). The image data and the initial weight of the load cell 13 are acquired. These initial measurement values are stored in the storage unit 23 and the like as reference values for measuring the deformation amount and weighting of the spectacle lens 100.

  Next, in step S3, weighting by the weighting device 10 is started (first process). Specifically, as shown in FIG. 1, the motor device 18 is driven, the screw 19 is turned, and the movable lens clamp 15 is gradually moved to the + X side so as to approach the fixed lens clamp 14 in the first direction. . Thereby, the load on the holding surface 101 is gradually increased, and the spectacle lens 100 is compressed in the longitudinal direction. When the spectacle lens 100 is compressed, the spectacle lens 100 is deformed (bending) so as to be convex upward.

  Next, in step S4, it is detected whether or not a crack C has occurred in the coat film 103 due to the deformation of the spectacle lens 100 (second step). Specifically, the occurrence of a crack C in the coat film 103 is detected by image analysis in real time. Reference numeral 11 a in FIG. 4A indicates an imaging region of the first imaging camera 11. Image data captured by the first imaging camera 11 is subjected to image analysis by the image analysis unit 24. The image analysis unit 24 performs image analysis on the acquired image data using the above-described image processing method with reference to the initial image data acquired in advance in step S2, and detects the presence or absence of the crack C.

  Since the weighting direction of the present embodiment is the longitudinal direction of the spectacle lens 100, the crack C generated in the spectacle lens 100 is a “vertical crack”. If the occurrence of such a crack C cannot be detected, the process returns to step S4 and image analysis is continued until the crack C occurs. On the other hand, if the occurrence of a crack C is detected in step S4, the process proceeds to step S5.

  Next, in step S5, each measured value when the crack C occurs is stored (third step). Specifically, when the crack C occurs, the magnitude of the weight, the first deformation amount in the first direction caused by the weight, and the second deformation in the thickness direction of the spectacle lens 100 caused by the weight. The measured value related to the quantity is stored in the storage unit 23. The magnitude of the weight when the crack C is generated can be measured by the load cell 13. The first deformation amount and the second deformation amount can be measured by the second imaging camera 12.

Reference numeral 12 a in FIG. 4B indicates an imaging region of the second imaging camera 12. When the crack C occurs, the first deformation amount in the first direction (X-axis direction) of the spectacle lens 100 caused by the weighting is 2 in the initial image data (in FIG. 4B) acquired in advance in step S2. It can be measured by the difference D1 from the acquired image data with reference to (shown by a chain line). Further, the second deformation amount in the thickness direction (Y-axis direction) of the spectacle lens 100 caused by the load when the crack C occurs is obtained based on the initial image data obtained in advance in step S2. It can be measured by the difference D2 from the data.
If the said measured value is acquired, a measurement will be complete | finished.

  According to the present embodiment, a load is applied to the holding surface 101 held by the frame in the first direction and the spectacle lens 100 is deformed, so that the load applied to the spectacle lens 100 when the frame is put into the frame is reduced. It can be simulated, and when the crack C is generated in the coat film 103 of the surface 102 due to the deformation of the spectacle lens 100 due to the load, the magnitude of the load, the deformation amount in the first direction, and the thickness direction By measuring the amount of deformation 2, these measured values can be used as a measure of durability (an index indicating durability) of the coat film 103 in the frame placing operation of the spectacle lens 100. For this reason, in this embodiment, the appropriateness and risk with respect to the frame of the spectacle lens 100 can be evaluated.

  Thus, according to the above-described embodiment, the durability measurement method for the coating film 103 provided on the surface 102 different from the holding surface 101 of the spectacle lens 100 having the holding surface 101 held by the frame body is provided. A first step (step S3) of applying weight to the holding surface 101 along the first direction, a second step (step S4) of detecting the occurrence of the crack C of the coat film 103 due to the load, and the crack C Of the weight, the first deformation amount in the first direction of the spectacle lens 100 caused by the weight, and the second deformation amount in the thickness direction of the spectacle lens 100 caused by the weight at the time of occurrence of Adequately evaluating the durability of the coating film 103 against deformation at the time of frame insertion by adopting a method of having a third step (step S5) for measuring any one of them Possible and becomes, durability of coating film 103 of the spectacle lens 100 (incoming difficulty of crack C during framing, etc.) can be known in advance.

  As mentioned above, although preferred embodiment of this invention was described referring drawings, this invention is not limited to the said embodiment. Various shapes, combinations, and the like of the constituent members shown in the above-described embodiments are examples, and various modifications can be made based on design requirements and the like without departing from the gist of the present invention.

  For example, in the above-described embodiment, the technique for detecting the occurrence of cracks in the coating film by image analysis has been described. However, the present invention is not limited to this technique, and can be performed, for example, by visual inspection. . Further, for example, the detection is not limited to the method of detecting the occurrence of a crack in the coat film by an image, visual sense, or the like, and it is also possible to detect by the sound at the time of occurrence of the crack. For example, detection can be performed by installing an elasticity detection device (for example, acoustic emission) that detects sound at the time of occurrence of a crack instead of the first imaging camera.

  In the present embodiment, the method of setting the weighting direction (first direction) for the spectacle lens to the longitudinal direction of the spectacle lens has been described. However, the present invention is not limited to this method, and for example, the weighting direction is set. A direction inclined with respect to the longitudinal direction may be set, and for example, the weighting direction may be set to the short direction of the spectacle lens. Further, when the spectacle lens is circular in plan view, the weighting direction may be set to an arbitrary direction passing through the center of the circle.

  Further, for example, in the above-described embodiment, the magnitude of the weight at the time of occurrence of the crack, the first deformation amount in the first direction of the spectacle lens caused by the weight, and the thickness of the spectacle lens caused by the weight. Although the method for measuring all the second deformation amounts in the vertical direction has been described, the present invention is not limited to this method, and any one of them is measured, and one of them shows durability. It may be used as an index.

  DESCRIPTION OF SYMBOLS 1 ... Coat film durability measuring apparatus, 4 ... Crack generation | occurrence | production detection apparatus, 5 ... Measuring apparatus, 10 ... Weighting apparatus, 11 ... 1st imaging camera (imaging camera), 12 ... 2nd imaging camera, 13 ... Load cell, 24 ... Image analysis unit, 100 ... Eyeglass lens, 101 ... Holding surface, 101 ... Surface, 103 ... Coat film, C ... Crack, D1 ... Difference (first deformation amount), D2 ... Difference (second deformation amount)

Claims (13)

A method for measuring the durability of a coating film provided on a surface different from the holding surface of the spectacle lens having a holding surface held by a frame,
A first step of weighting the holding surface along a first direction;
A second step of detecting the occurrence of cracks in the coating film due to the load;
At the time of occurrence of the crack, the magnitude of the weight, the first deformation amount of the spectacle lens in the first direction caused by the weight, and the thickness direction of the spectacle lens caused by the weight. And a third step of measuring at least one of the two deformation amounts.   The method of measuring a durability of a coating film according to claim 1, wherein in the second step, the occurrence of a crack in the coating film is detected by image analysis.   2. The method of measuring a durability of a coating film according to claim 1, wherein in the second step, the occurrence of a crack in the coating film is detected by a sound at the time of the occurrence.   The durability measurement method for a coating film according to any one of claims 1 to 3, wherein the coating film includes at least an antireflection film.   The method for measuring durability of a coat film according to claim 1, wherein the spectacle lens has a target lens shape.   The durability measurement method for a coat film according to any one of claims 1 to 5, wherein the first direction is a longitudinal direction of the spectacle lens. A coating film durability measurement device provided on a surface different from the holding surface of the spectacle lens having a holding surface held by a frame,
A weighting device for weighting the holding surface along a first direction;
A crack occurrence detection device for detecting the occurrence of cracks in the coat film due to the load;
When the crack is generated, the magnitude of the weight, the first deformation amount in the first direction caused by the weight, and the second deformation amount in the thickness direction of the spectacle lens caused by the weight. A coating film durability measuring device, comprising: a measuring device that measures at least one of the above. The crack occurrence detection device,
An imaging camera for imaging the surface of the spectacle lens;
The coating film durability measurement according to claim 7, further comprising: an image analysis device that detects occurrence of cracks in the coating film by performing image analysis on image data acquired by the imaging camera. apparatus.   The coating film durability measuring apparatus according to claim 7, wherein the crack occurrence detection device includes an elastic wave detection device that detects sound when a crack is generated in the coating film.   The coating film durability measuring apparatus according to claim 7, wherein the coating film includes at least an antireflection film.   The said spectacle lens has a target lens shape, The durability measuring apparatus of the coating film as described in any one of Claims 7-10 characterized by the above-mentioned.   12. The coating film durability measuring apparatus according to claim 7, wherein the first direction is a longitudinal direction of the spectacle lens.   The measurement device includes at least one of a load cell that measures the magnitude of the weight and a second imaging camera that images the eyeglass lens from a second direction orthogonal to the first direction and the thickness direction. The coating film durability measuring apparatus according to any one of claims 7 to 12, wherein:

Images