JP6038668B2 - Lens manufacturing method - Google Patents

Description

  The present invention relates to a method for manufacturing a spectacle lens having a surface to be cut and a spectacle lens having a coat film on the surface to be cut, and more particularly to a method for manufacturing a lens capable of objectively evaluating the influence of waviness on the lens surface. .

  Conventionally, in order to manufacture a spectacle lens suitable for a prescription value, a lens base material (semi-finished blanks or the like) is cut by a cutting machine such as a curve generator. In cutting with this type of cutting machine, cutting traces remain on the surface of the lens substrate to be cut. The surface roughness as the surface property due to the cutting trace is roughly classified into a short wavelength component and a medium / long wave component. The short wavelength component of the surface roughness is the minute unevenness itself that forms the cutting trace, and the medium and long wave component of the surface roughness is an envelope that connects the tops of adjacent irregularities that form the cutting trace. This represents the background roughness (swell) of the cut surface.

  When a hard coat film or an antireflection film is formed without polishing the surface to be cut, the short wavelength component of the surface texture roughness is smoothed and substantially removed, but the medium and long wave component (swell) Is not smoothed and remains on the surface of a hard coat film or the like. If the spectacle lens has waviness, optical distortion occurs and is perceived by the human eye. Therefore, as exemplified in Patent Document 1, the surface to be cut is polished with a polishing jig after cutting, and the waviness is generated. Is reduced. A spectacle lens with high surface accuracy can be obtained by forming a hard coat film or an antireflection film on the surface to be cut with reduced waviness.

JP 2004-82324 A

  However, this type of polishing treatment has a problem that the burden is large both in terms of cost and time. In particular, it is difficult to polish a complicated surface shape such as a free-form surface with high accuracy, and there is a possibility that the optical performance greatly changes depending on the amount of polishing removal. Therefore, it is desired to obtain a spectacle lens with reduced waviness while omitting the polishing process on the surface to be cut from the manufacturing process. In addition, in order to evaluate such spectacle lenses, an evaluation method (inspection method) for objectively and quantitatively evaluating the influence of waviness is also required.

  When a spectacle lens has waviness, optical distortion occurs and is perceived by the human eye. Therefore, the amount of this optical distortion (that is, the waviness) is usually measured by performing a projection inspection in the manufacturing process of the spectacle lens. The impact is inspected. Specifically, light from an ultra-high pressure mercury lamp is projected onto a screen through a spectacle lens on which a hard coat film or antireflection film is formed, and the shadow (striped pattern) observed on the screen is visually evaluated. (Japanese Industrial Standards: JIS-T7313). However, in such a projection inspection, the judgment criteria for the presence or absence of shadows differ depending on the individual difference of the observer, so there is a problem that the inspection results vary, and it is not possible to objectively and quantitatively evaluate the influence of undulations Can not.

  The present invention has been made to solve the above problems. That is, an object of the present invention is to provide a lens manufacturing method capable of objectively and quantitatively evaluating the influence of the waviness of a spectacle lens.

  A method for manufacturing a lens according to an embodiment of the present invention includes a step of cutting at least one surface of a lens base material, and a hard coat by attaching a predetermined coating liquid to at least a partial region of the cut surface to be cut. Forming a film, and a method of manufacturing a lens, comprising measuring a shape of a surface to be cut on which a hard coat film is formed, obtaining surface texture measurement data, and based on the surface texture measurement data, A step of determining the shape of the undulation of the surface to be cut, a step of performing ray tracing when parallel light is incident on the surface to be cut based on the shape of the undulation, and a predetermined distance from the lens substrate; And obtaining a light amount distribution of light transmitted through the lens substrate by ray tracing on a virtual plane perpendicular to the optical path of the parallel light.

  According to such a method, since the influence of the undulation of the spectacle lens can be obtained from the light amount distribution of the light by the ray tracing, the influence of the undulation of the spectacle lens can be objectively and quantitatively evaluated.

  Further, it may further include a step of determining whether or not the light amount distribution is within a predetermined range and displaying the determined result on a display device. According to such a method, the user can easily determine whether the lens base material is non-defective or defective based on the determination result, so that the inspection time for the lens base material can be shortened.

  Further, it may further include a step of determining whether or not the cut lens base material is processed within a predetermined tolerance based on the surface property measurement data, and displaying the determined result on a display device. .

  In the step of obtaining the waviness shape, it is desirable to obtain a cross-sectional curve indicating the cross-sectional shape of the lens substrate from the surface texture measurement data, and to obtain a waviness curve by removing a predetermined short wavelength component from the cross-sectional curve.

  According to the lens manufacturing method of the present invention, it is possible to objectively and quantitatively evaluate the influence of the waviness of the spectacle lens.

It is a block diagram which shows the structure of the spectacle lens manufacturing system for implement | achieving the manufacturing method of the spectacle lens which concerns on embodiment of this invention. It is a flowchart which shows the manufacturing process of the spectacle lens which concerns on embodiment of this invention. It is a figure which shows schematic structure of the conventional projection inspection apparatus. It is a figure which shows the shadow (stripe pattern) produced | generated on the screen by the projection test | inspection apparatus of FIG. It is a schematic diagram for demonstrating the mechanism in which a shadow (stripe pattern) is produced | generated on the screen of the projection inspection apparatus of FIG. It is a flowchart explaining the test | inspection process of the spectacle lens which concerns on embodiment of this invention. It is a figure and graph explaining the arithmetic processing implemented in the test | inspection process of the spectacle lens which concerns on embodiment of this invention. It is the graph which illustrated the result of the simulation by ray tracing performed in the inspection process of the spectacle lens concerning the embodiment of the present invention.

  A spectacle lens manufacturing system according to an embodiment of the present invention will be described below with reference to the drawings.

[Eyeglass lens manufacturing system 1]
FIG. 1 is a block diagram showing a configuration of a spectacle lens manufacturing system 1 for realizing the spectacle lens manufacturing method of the present embodiment. As shown in FIG. 1, a spectacle lens manufacturing system 1 includes a spectacle store 10 that orders spectacle lenses according to a prescription for a customer (planned wearer), and spectacle lenses that manufacture spectacle lenses in response to an order from the spectacle store 10. It has a lens manufacturing factory 20. The order to the spectacle lens manufacturing factory 20 is made through a predetermined network such as the Internet or data transmission by FAX. The orderer may include ophthalmologists and general consumers.

<Optical store 10>
The spectacle store 10 is provided with a store computer 100. The store computer 100 is, for example, a general PC (Personal Computer), and is installed with software for ordering eyeglass lenses from the eyeglass lens manufacturing factory 20. Lens data and frame data are input to the store computer 100 through operation of a mouse, a keyboard, and the like by an eyeglass store staff. Examples of lens data include prescription values (base curve, spherical power, astigmatic power, astigmatic axis direction, prism power, prism base direction, addition power, distance PD (Pupillary Distance), near-field PD, etc.), glasses Lens wearing conditions (corneal apex distance, forward tilt angle, frame tilt angle), spectacle lens types (single focal sphere, single focal aspherical, multifocal (double focal, progressive), coating (dyeing, hard coating, Anti-reflection film, UV protection, etc.)), layout data according to customer requirements, and the like. The frame data includes the shape data of the frame selected by the customer. The frame data is managed by, for example, a barcode tag, and can be obtained by reading the barcode tag attached to the frame by a barcode reader. The store computer 100 transmits order data (lens data and frame data) to the eyeglass lens manufacturing factory 20 via the Internet, for example.

<Glasses lens manufacturing factory 20>
The spectacle lens manufacturing factory 20 has a LAN (Local Area Network) centered on the host computer 200, and includes a spectacle lens design computer 202, a spectacle lens processing computer 204, and a spectacle lens inspection computer 208. Terminal devices are connected. The spectacle lens design computer 202, the spectacle lens processing computer 204, and the spectacle lens inspection computer 208 are general PCs, which respectively have spectacle lens design programs, spectacle lens processing programs, and spectacle lens inspection programs. Installed. Order data transmitted from the store computer 100 via the Internet is input to the host computer 200. The host computer 200 transmits the input order data to the spectacle lens design computer 202.

  The eyeglass lens design computer 202 is installed with a program for designing eyeglass lenses according to orders, creates lens design data based on order data (lens data), and based on order data (frame data). Create the target lens processing data. The spectacle lens design computer 202 transfers the created lens design data and target lens shape processing data to the spectacle lens processing computer 204 and the spectacle lens inspection computer 208.

[Manufacturing process of eyeglass lenses]
The spectacle lens is manufactured in accordance with lens design data and target lens shape processing data created by the spectacle lens design computer 202. FIG. 2 is a flowchart showing the manufacturing process of the spectacle lens.

<S1 in FIG. 2 (Cutting Process)>
In order to improve productivity, the spectacle lens manufacturing factory 20 divides the frequency of the entire production range into a plurality of groups, and sets the convex curve shape (spherical shape or aspherical shape) and the lens diameter suitable for the frequency range of each group. Semi-finished blanks are prepared in advance for ordering eyeglass lenses. Semi-finished blanks are, for example, resin blanks or glass blanks.

  The operator selects semi-finished blanks according to the result of the lens design by the spectacle lens design computer 202, sets the semi-finished blank in a processing machine (for example, a cutting machine such as a curve generator) 206, and processes the spectacle lens processing computer 204. Enter the start instruction. The eyeglass lens processing computer 204 reads the lens design data and the target lens shape processing data transferred from the eyeglass lens design computer 202 and drives and controls the processing machine 206. The processing machine 206 cuts one surface of the semifinished blanks according to the lens design data to create a concave shape of the spectacle lens. Further, the processing machine 206 processes the outer peripheral surface of the uncut lens after creation of the concave shape into a peripheral shape corresponding to the target lens shape.

  In another embodiment, the semi-finished blanks may be replaced with unfinished block pieces on both sides in order to produce spectacle lenses that are better suited to the prescription of the intended wearer. In this case, each surface of the block piece is cut according to the lens design data by the processing machine 206 to form the convex shape and the concave shape of the spectacle lens.

<S2 in FIG. 2 (Coating liquid adhesion process)>
The eyeglass lens (lens substrate) after processing the target lens shape is immersed in a predetermined solution, and various coatings such as a hard coat film, an antireflection film, and an ultraviolet ray cut are applied. Thus, the spectacle lens of this embodiment forms a hard coat film etc., without performing the grinding | polishing process with respect to the to-be-cut surface cut by the processing machine 206. FIG. When a hard coat film or the like is formed on the surface to be cut, the short wavelength component of the surface texture roughness is smoothed and removed, so that a transparent spectacle lens is obtained. However, when a hard coat film or the like is directly formed on the surface to be cut, the medium and long wave components (waviness) of the surface texture roughness are not removed, and the waviness remaining on the surface to be cut is formed on the surface of the film. There is a risk of malfunction. For this reason, in this embodiment, the influence of the waviness on the lens base material is simulated and inspected in the inspection process described later. When the lens substrate is made from semi-finished blanks, the various coating processes are performed only on one surface (the concave surface that is the surface to be cut), and the lens substrate is formed from a block piece that is not processed on both sides. When it is created, it is performed on each surface (a concave surface and a convex surface, which are surfaces to be cut).

<S3 in FIG. 2 (inspection process)>
As described above, the lens design data created by the spectacle lens design computer 202 is also transferred to the spectacle lens inspection computer 208. The eyeglass lens inspection computer 208 is connected to the surface texture measuring device 210. The surface texture measuring instrument 210 is a measuring instrument for measuring the surface texture of a spectacle lens to which various coatings have been applied. 2D or 3D stylus type surface roughness measuring instrument such as (trade name), New View (trade name, manufactured by Zygo Co., Ltd.), GPI (trade name, manufactured by Zygo Co., Ltd.), laser A three-dimensional non-contact surface shape measuring instrument such as a microscope (for example, manufactured by Keyence Corporation) can be used. The surface texture measurement data of the spectacle lens measured by the surface texture measuring device 210 is transferred to the spectacle lens inspection computer 208. Then, the spectacle lens inspection computer 208 uses the spectacle lens shape and swell based on the lens design data input from the spectacle lens design computer 202 and the surface texture measurement data input from the surface texture measuring device 210. Inspect each item of influence (details will be described later). When the inspection process ends, the spectacle lens manufacturing process ends, and the spectacle lens that is determined to pass in the inspection process is delivered to the spectacle store 10.

  As described above, the evaluation (inspection) of the undulation on the lens base material (glasses lens) to which various types of coding have been applied conventionally is performed by projecting light from an ultra-high pressure mercury lamp or the like onto the screen through the lens base material. This was done by visually evaluating the shadows (stripes) observed above. Specifically, when a shadow is seen on the screen, it is judged that there is an influence of undulation and is rejected. When no shadow is seen on the screen, it is judged that there is no influence of undulation and it is accepted. However, in such a visual projection inspection, since the judgment criteria differ depending on the individual difference of the observers, the inspection results vary, and the influence of undulation cannot be objectively and quantitatively evaluated. Therefore, in the present embodiment, light analysis is performed based on the surface texture measurement data (that is, the shape of the undulation) input from the surface texture measuring device 210, and the presence or absence of the shadow (that is, the influence of the undulation) is objectively and It is configured so that it can be quantitatively evaluated.

  Here, in order to facilitate understanding of the inspection process of the present embodiment, a conventional spectacle lens projection inspection and a mechanism for generating a shadow on the screen will be described. FIG. 3 is a diagram illustrating a schematic configuration of a projection inspection apparatus 300 that performs a conventional projection inspection, and FIG. 4 is a diagram illustrating a shadow (striped pattern) generated on the screen by the projection inspection apparatus 300. As shown in FIG. 4, the projection inspection apparatus 300 includes a light source device 310 and a projection screen 320. The light source device 310 includes a light source 312, an aperture stop 314, a collimator lens 316, and an optical filter 318. The light source 312 is, for example, a mercury lamp, and the light from the light source 312 is adjusted to a predetermined light amount by the aperture stop 314 and converted into substantially parallel light by the collimator lens 316. Then, only green light having a peak wavelength of about 550 nm is extracted by the optical filter 318 and emitted toward the screen 320 (hereinafter, light emitted from the light source device 310 is referred to as “illumination light A”). The lens substrate L, which is an inspection object of the projection inspection apparatus 300, is supported by a support base (not shown) and inserted into the light beam of the illumination light A, and light transmitted through the lens substrate L is incident on the projection screen 320. (Projection). And when there exists a wave | undulation in the surface of the lens base material L, as shown in FIG. 4, a shadow (stripe pattern) is observed on the projection screen 320. FIG. FIG. 4 shows an enlarged view of the shadow generated on the projection screen 320.

FIG. 5 is a schematic diagram for explaining a mechanism by which a shadow (striped pattern) is generated on the projection screen 320. FIG. 5A shows a state of refraction of the light beam of the illumination light A when the amplitude of the undulation on the surface of the lens substrate L is large, and FIG. 5B shows the amplitude of the undulation on the surface of the lens substrate L. Schematically shows the state of refraction of the luminous flux of the illumination light A when is small. As shown in FIG. 5, the light beam of the illumination light A propagates in the air and enters the lens base material L substantially perpendicularly. The illumination light A that has entered the lens base L has a different refractive index of air (n1 = 1.0) and a refractive index of the lens base L (for example, n2 = 1.501). Is refracted on the surface of the lens substrate L according to Snell's law expressed by the following, and propagates inside the lens substrate L.
n1 · sin θ1 = n2 · sin θ2 (1)
Here, θ1 is an incident angle of the illumination light A from the air to the lens substrate L, and θ2 is a refraction angle.

  When the light beam of the illumination light A reaches the back surface of the lens substrate L (the surface facing the surface on which the illumination light A is incident), the illumination light A is refracted again according to Snell's law and is projected onto the projection screen 320. To. As shown in FIG. 5B, when the amplitude of the undulation on the surface of the lens substrate L is sufficiently small, the variation in the incident angle of the illumination light A incident on the lens substrate L is small, and the illumination light A Since the bending of the light beam is small, the illumination light A that has passed through the lens base L propagates substantially in parallel and irradiates the projection screen 320 substantially uniformly. For this reason, no shadow is generated on the projection screen 320. On the other hand, as shown in FIG. 5A, when the amplitude of the undulation on the surface of the lens substrate L is large, the incident angle of the illumination light A incident on the lens substrate L varies widely (changes). The bending of the luminous flux of the illumination light A increases. For this reason, the light beam of the illumination light A that has passed through the lens base L is dispersed according to the wavelength and amplitude of the undulation, and on the projection screen 320 there are a bright portion where the light beam is concentrated and a dark portion where the light beam is dispersed. It is formed. That is, a shadow is generated on the projection screen 320. The waviness is a medium-long wave component of the cutting trace of the processing machine 206, and the wavelength of the waviness is the processing machine used for the cutting process, the rotational speed of the cutting tool, the feed speed, the cutting depth, the material of the semi-finished blanks, etc. In general, the bright part and the dark part on the projection screen 320 are repeatedly observed at a predetermined interval.

  Thus, the shadow (that is, the influence of the undulation) observed on the projection screen 320 can be explained by the refraction of the illumination light A. Therefore, if the shape of the undulation and the refractive index of the lens base material L are known, it is possible to determine the shadow observed on the projection screen 320 by simulation. In the eyeglass lens inspection process of the present embodiment, the conventional projection inspection is simulated using the shadow generation mechanism as described above, and the influence of undulation is objectively and quantitatively evaluated.

  FIG. 6 is a detailed flowchart for explaining the eyeglass lens inspection process (S3 in FIG. 2) of the present embodiment.

(S11 in FIG. 6: Surface property measurement of spectacle lens)
In the spectacle lens inspection process of the present embodiment, first, the surface texture measuring device 210 accurately measures the shape of the spectacle lens surface. The surface texture measurement data of the spectacle lens measured by the surface texture measuring instrument 210 of the present embodiment includes at least the spectacle lens shape and surface roughness data, and is transferred to the spectacle lens inspection computer 208. It is used when inspecting each item of the shape of the spectacle lens and the influence of waviness.

(S12 in FIG. 6: Generation of a waviness curve)
The “undulation” that is the surface property of the lens base material is calculated from the surface roughness data of the spectacle lens by the spectacle lens inspection computer 208. As described above, various types of measuring devices can be applied to the surface texture measuring device 210 of the present embodiment. However, the surface roughness data is ISO 3274: '96 (stylus) It is desirable to be determined according to the formula (surface roughness measuring machine characteristics), ISO 4287: '97 (surface texture terms, definitions and parameters), ISO 4288: '96 (surface texture evaluation method and procedure), etc. . Further, in accordance with ISO 4287: '97, it is desirable that a length obtained by multiplying the reference length by the standard number is one evaluation length, and the surface roughness at this evaluation length is evaluated. The reference length and the evaluation length can be appropriately determined according to ISO 4288: '96.

  The spectacle lens inspection computer 208 generates a measurement cross-sectional curve from the surface roughness data input from the surface texture measuring device 210. FIGS. 7A to 7D are graphs conceptually showing various contour curves obtained by applying filtering or filtering to the measurement cross-section curve when evaluating the surface roughness according to ISO 4287: '97. It is. As shown in FIG. 7A, a roughness curve and a waviness curve are superimposed on the measurement cross-sectional curve according to the wavelength band. Therefore, in this embodiment, unnecessary wavelength components are removed from the measurement cross-sectional curve by filtering using the wavelengths λs, λc, and λf, and a desired surface roughness component is extracted (details will be described later). The wavelengths λs, λc, and λf are called cut-off values, and are determined according to ISO 3274: '96.

  The eyeglass lens inspection computer 208 applies a low-pass filter having a cutoff value λs to the measurement cross-section curve, and generates a cross-section curve as shown in FIG. Then, a medium-long wave component is removed by applying a wide-area filter having a cutoff value λc to the cross-sectional curve, and a roughness curve as shown in FIG. 7C is generated. Further, the eyeglass lens inspection computer 208 sequentially applies filters with cutoff values λc and λf to the cross-sectional curve to remove short wavelength components and excess medium and long wave components, as shown in FIG. A waviness curve (waviness shape) is generated.

(S13 in FIG. 6: Simulation by ray tracing)
Next, the spectacle lens inspection computer 208 performs ray tracing based on the waviness curve obtained in S12 and the spectacle lens shape data input from the surface texture measuring device 210, thereby simulating a conventional projection inspection. Specifically, with respect to the spectacle lens specified by the spectacle lens shape data and the waviness curve, the light beam when the parallel light is incident from the perpendicular direction (that is, the direction along the optical axis of the spectacle lens) is traced, The light amount distribution on the surface (on the virtual plane) corresponding to the conventional projection screen 320 is calculated. FIG. 8 is a graph showing an example of a simulation result by ray tracing, and represents a light amount distribution at each position of the spectacle lens. The square plot in FIG. 8 shows the amount of light on the surface corresponding to the conventional projection screen 320 by performing ray tracing for a spectacle lens having a waviness amplitude Wt of 0.04 mm (maximum cross-sectional height of the waviness curve). Is calculated at a pitch of 0.7 mm. In addition, the circle plot in FIG. 8 traces the ray for a spectacle lens having a swell amplitude Wt of 0.33 mm, and calculates the amount of light on the surface corresponding to the conventional projection screen 320 at a 0.7 mm pitch. It is a thing. As shown in FIG. 8, it can be seen that a shadow is generated (that is, a change in the light amount level is increased) when the amplitude Wt of the undulation is increased. As described above, in the eyeglass lens inspection process of the present embodiment, the effect of the undulation is evaluated by performing the simulation by ray tracing and calculating the light amount distribution on the surface corresponding to the conventional projection screen 320. .

(S14 in FIG. 6: Evaluation of light quantity distribution)
Next, the eyeglass lens inspection computer 208 evaluates the light amount distribution obtained in S13 and determines whether or not the influence of the undulation is acceptable. Specifically, the difference between the peak value and the bottom value of the light amount distribution obtained in S13 is obtained, and it is determined whether or not it is equal to or less than a predetermined threshold value. If the difference between the peak value and the bottom value of the light amount distribution obtained in S13 is equal to or smaller than a predetermined threshold value, it is determined that the influence of the undulation is acceptable, and the undulation inspection is determined to be acceptable. On the other hand, when the difference between the peak value and the bottom value of the light amount distribution obtained in S13 is larger than a predetermined threshold value, it is determined that the influence of the undulation is unacceptable, and the undulation inspection is determined to be unacceptable. The determination result of the swell inspection is displayed on a monitor (not shown) connected to the eyeglass lens inspection computer 208. Note that the evaluation of the light amount distribution is not limited to the determination based on the threshold value as described above, but may be any method that can confirm that the light amount distribution is within a predetermined range.

(S15 in FIG. 6: Evaluation of spectacle lens shape)
The spectacle lens inspection computer 208 evaluates whether or not the spectacle lens determined to pass in S14 has a predetermined shape. Specifically, the spectacle lens shape data included in the surface texture measurement data is compared with the lens design data input from the spectacle lens design computer 202, and whether or not the spectacle lens is processed within a predetermined tolerance. Determine whether. If it is processed within a predetermined tolerance, the spectacle lens shape inspection is determined to be acceptable, and if it is not processed within the predetermined tolerance, the spectacle lens shape inspection is determined to be unacceptable. The determination result of the spectacle lens shape inspection is displayed on a monitor (not shown) connected to the spectacle lens inspection computer 208, and the spectacle lens inspection process ends.

  As described above, in the eyeglass lens inspection process of the present embodiment, a waviness curve is obtained from the surface property measurement data, ray tracing is performed based on the waviness curve, and a conventional projection inspection simulation is performed. Then, the light amount distribution on the surface corresponding to the conventional projection screen 320 is calculated, and the influence of the undulation is evaluated from the light amount distribution. Therefore, according to the lens manufacturing method including the eyeglass lens inspection process of the present embodiment, the influence of waviness can be objectively and quantitatively evaluated.

  The above is the description of the exemplary embodiments of the present invention. Embodiments of the present invention are not limited to those described above, and various modifications are possible within the scope of the technical idea of the present invention. For example, the embodiment of the present application also includes contents appropriately combined with examples and the like clearly shown in the specification or obvious examples.

  For example, in the above description, the surface roughness is evaluated according to ISO 4287: '97, or the cutoff value is determined according to ISO 3274: '96. Various criteria such as the criteria for determining the cut-off value are not limited to the above and can be changed as appropriate.

  In the above description, the inspection process is performed on the spectacle lens with various coatings, but the inspection process is performed on the lens base material after the cutting process (that is, the lens base material before coating). May be implemented. For example, after the cutting process, the inspection process can be performed by performing a polishing process until the lens substrate becomes transparent (that is, to the extent that the inspection process can be performed).

DESCRIPTION OF SYMBOLS 1 Eyeglass lens manufacturing system 10 Eyeglass shop 20 Eyeglass lens manufacturing factory 100 Shop computer 200 Host computer 202 Eyeglass lens design computer 204 Eyeglass lens processing computer 206 Processing machine 208 Eyeglass lens inspection computer 210 Surface texture measuring device 300 Projection inspection device 310 Light source device 312 Light source 314 Aperture stop 316 Collimator lens 318 Optical filter 320 Projection screen

Claims (4)

Cutting at least one surface of the lens substrate;
Forming a hard coat film by attaching a predetermined coating liquid to at least a partial region of the cut surface to be cut, and a method for producing a lens,
Measuring the shape of the cut surface on which the hard coat film is formed, and obtaining surface property measurement data;
Based on the surface texture measurement data, obtaining a waviness shape of the cut surface;
Based on the shape of the swell, performing a ray tracing when parallel light is incident on the surface to be cut; and
Obtaining a light amount distribution of light transmitted through the lens base material by the ray tracing on a virtual plane that is separated from the lens base material by a predetermined distance and perpendicular to the optical path of the parallel light;
A method for manufacturing a lens, comprising:   The method for manufacturing a lens according to claim 1, further comprising a step of determining whether or not the light amount distribution is within a predetermined range and displaying the determined result on a display device.   The method further includes the step of determining whether or not the cut lens substrate is processed within a predetermined tolerance based on the surface property measurement data, and displaying the determined result on a display device. The method for producing a lens according to claim 1, wherein the lens is produced.   The step of obtaining the shape of the undulation is characterized by obtaining a cross-sectional curve indicating a cross-sectional shape of the lens substrate from the surface texture measurement data, and obtaining a undulation curve by removing a predetermined short wavelength component from the cross-sectional curve. The method for manufacturing a lens according to any one of claims 1 to 3.