Spectacle lens measurement device, and spectacle lens measurement program

Abstract

To provide a spectacle lens measurement device and spectacle lens measurement program that can highly accurately acquire an inter-pupillary distance of a spectacle lens.SOLUTION: A spectacle lens measurement device measures an optical characteristic of a spectacle lens, and the spectacle lens measurement device comprises: optical characteristic measurement means that projects a measurement light flux to a wide are of the spectacle lens put into a spectacle frame, and receives the measurement light flux passing through the spectacle lens to thereby measure an optical characteristic of the spectacle lens; angle information acquisition means that acquires at least any of angle information on a lens curve of the spectacle lens and angle information on warping of the spectacle frame; inter-pupillary distance acquisition means that acquires a first inter-pupillary distance of the spectacle lens on the basis of an optical characteristic of a left lens in the spectacle lens and an optical characteristic of a right lens therein; correction means that corrects the first inter-pupillary distance of the spectacle lens on the basis of the angle information, and acquires a second inter-pupillary distance after corrected; and output means that outputs the second inter-pupillary distance of the spectacle lens.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a spectacle lens measurement device and a spectacle lens measurement program for measuring optical characteristics of a spectacle lens. [Background technology]

[0002] Lens meters are known as eyeglass lens measuring devices. Lens meters can measure the optical characteristics of eyeglass lenses by projecting a measurement light beam onto the eyeglass lens and receiving the measurement light beam that has passed through the eyeglass lens (see Reference 1). There are two types of lens meters: one in which the eyeglass lens is placed on a nosepiece and uses a measurement light beam that has passed through the eyeglass lens and the nosepiece diameter, and another that uses a measurement light beam that has passed through a wide area of ​​the eyeglass lens (so-called lens checkers). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2008-241694 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the lens meter, the interpupillary distance may be calculated based on the optical characteristics of the left and right eyeglass lenses. However, for example, the lens meter and the lens checker may have different measurement results of the optical characteristics even if the eyeglass lenses are the same, due to the difference in the measurement principles between the two, and as a result, there is a possibility that the interpupillary distance cannot be calculated accurately.

[0005] In view of the above-described conventional techniques, the present disclosure has as its technical object to provide a spectacle lens measurement device and a spectacle lens measurement program capable of obtaining the interpupillary distance of a spectacle lens with high accuracy. [Means for solving the problem]

[0006] In order to solve the above problems, the present disclosure is characterized by having the following configuration. (1) A spectacle lens measuring device according to a first aspect of the present disclosure is a spectacle lens measuring device for measuring optical characteristics of a spectacle lens, comprising: an optical characteristic measuring means for measuring the optical characteristics of the spectacle lens by projecting a measurement light beam onto a wide area of ​​the spectacle lens fitted in a spectacle frame and receiving the measurement light beam that has passed through the spectacle lens; an angle information acquiring means for acquiring at least one of angle information regarding the lens curve of the spectacle lens and angle information regarding the warp of the spectacle frame; an interpupillary distance acquiring means for acquiring a first interpupillary distance of the spectacle lens based on the optical characteristics of a left lens and an optical characteristics of a right lens of the spectacle lens; a correction means for correcting the first interpupillary distance of the spectacle lens based on the angle information and acquiring a corrected second interpupillary distance; and an output means for outputting the second interpupillary distance of the spectacle lens. (2) A spectacle lens measurement program according to a second aspect of the present disclosure is a spectacle lens measurement program used in a spectacle lens measuring device that measures optical characteristics of a spectacle lens, and is characterized in that, when executed by a processor of the spectacle lens measuring device, the program causes the spectacle lens measuring device to execute an optical characteristic measurement step of measuring the optical characteristics of the spectacle lens by projecting a measurement light beam onto a wide area of ​​the spectacle lens fitted in a spectacle frame and receiving the measurement light beam that has passed through the spectacle lens, an angle information acquisition step of acquiring at least one of angle information regarding the lens curve of the spectacle lens and angle information regarding the warp of the spectacle frame, an interpupillary distance acquisition step of acquiring a first interpupillary distance of the spectacle lens based on the optical characteristics of a left lens and the optical characteristics of a right lens of the spectacle lens, a correction step of correcting the first interpupillary distance of the spectacle lens based on the angle information and acquiring a corrected second interpupillary distance, and an output step of outputting the second interpupillary distance of the spectacle lens. [Brief description of the drawings]

[0007] [Figure 1] FIG. 1 is an external view of a spectacle lens measuring device. [Diagram 2] 2 is a schematic diagram of a support unit, an angle information measuring unit, and an optical property measuring unit. FIG. [Diagram 3] 4A and 4B are diagrams illustrating details of an angle information measurement unit. [Figure 4] 13 is an example of a captured image obtained by displaying a first index pattern on a first transmissive display. [Diagram 5] 13 is an example of a captured image obtained by displaying a second index pattern on the second transmissive display. [Figure 6] FIG. 2 is a diagram showing a control system of the eyeglass lens measurement apparatus. [Figure 7] FIG. 2 is a schematic diagram showing a measurement light beam emitted from a light source. [Figure 8] FIG. 13 is a diagram showing the relationship between the refractive power at the optical center position of the left lens and the front surface curve value. [Figure 9] FIG. 13 is a diagram illustrating a virtual model and a true model of a left lens. [Figure 10] FIG. 4 shows a second interpupillary distance of the lens. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] <Summary> An overview of the eyeglass lens measurement device according to the embodiment of the present disclosure will be described. The items classified in <> below can be used independently or in conjunction with each other.

[0009] The eyeglass lens measuring device of this embodiment measures the optical characteristics of an eyeglass lens. For example, the eyeglass lens measuring device may measure the optical characteristics of an eyeglass lens fitted in an eyeglass frame. For example, the optical characteristics of the eyeglass lens may be at least one of the refractive power of the eyeglass lens, the prism amount, etc. As an example, the refractive power of the eyeglass lens may be at least one of the spherical refractive power, the cylindrical refractive power, the cylinder axis angle, etc. In addition, an equivalent spherical refractive power may be obtained based on the spherical refractive power and the cylindrical refractive power.

[0010] The eyeglass lens measuring device of this embodiment may include an optical characteristic measuring means (e.g., a measuring optical system 20, a control unit 70). For example, the optical characteristic measuring means may measure the optical characteristics of the eyeglass lens by projecting a measuring light beam onto a wide area of ​​the eyeglass lens fitted in the eyeglass frame and receiving the measuring light beam that has passed through the eyeglass lens. For example, the optical characteristic measuring means may project the measuring light beam as a parallel light beam onto a wide area of ​​the eyeglass lens fitted in the eyeglass frame. Also, for example, the optical characteristic measuring means may measure the optical characteristics of at least one measurement point where a measuring light that is a part of the measuring light beam is incident on the eyeglass lens.

[0011] For example, the optical characteristic measuring means may comprise a measurement optical system for measuring the optical characteristics of the spectacle lens. For example, the measurement optical system may comprise at least a light source, an index pattern member, and a detector.

[0012] For example, the light source may irradiate a measurement light beam toward a wide area of ​​the eyeglass lens. For example, the light source may be at least one of a point light source (e.g., an LED (Light Emitting Diode) or the like), a surface light source (e.g., a light-emitting panel or the like), a display (e.g., a liquid crystal display or the like), and the like.

[0013] For example, the index pattern member may have an index pattern formed by an arrangement of a plurality of indices. For example, the index pattern member may be an index plate that forms an index pattern by a light-projecting portion that transmits the measurement light beam from the light source and a light-shielding portion that blocks the measurement light beam from the light source. Also, for example, the index pattern member may be a display (e.g., a transmissive display 24) that forms an index pattern by arbitrarily displaying a plurality of indices. For example, an index pattern image may be projected onto a spectacle lens by such an index pattern member.

[0014] For example, the detector may detect the measurement light beam that has passed through the eyeglass lens. For example, the detector may detect the measurement light beam that has passed through the eyeglass lens as an index pattern image.

[0015] Of course, for example, the measurement optical system may include various optical members in addition to the light source, the index pattern member, and the detector. For example, the measurement optical system may include an optical member (e.g., a lens, etc.) for shaping the measurement light beam from the light source. Also, for example, the measurement optical system may include an optical path branching member (e.g., a half mirror, etc.) for branching the measurement light beam from the light source into multiple optical paths.

[0016] The eyeglass lens measurement device of this embodiment may include an angle information acquisition means (e.g., a control unit 70). For example, the angle information acquisition means may acquire at least one of angle information related to the lens curve of the eyeglass lens and angle information related to the warp of the eyeglass frame.

[0017] For example, the angle information on the lens curve of the eyeglass lens may be information that represents the inclination angle of the eyeglass lens with respect to the optical axis. For example, the angle information on the lens curve of the eyeglass lens may be information that represents the inclination angle of the lens surface of the eyeglass lens. That is, for example, the angle information on the lens curve of the eyeglass lens may be information that represents the angle between the placement surface of the eyeglass lens and the lens surface of the eyeglass lens.

[0018] For example, the information representing the inclination angle of the lens surface of the eyeglass lens may be information representing the inclination angle at which the lens surface of the eyeglass lens is inclined linearly. As an example, it may be the inclination angle at which the lens surface of the eyeglass lens is inclined relative to the horizontal direction. Also, for example, the information representing the inclination angle of the lens surface of the eyeglass lens may be information representing the inclination angle at which the lens surface of the eyeglass lens is inclined curvedly. As an example, it may be curve information of the lens surface of the eyeglass lens. Note that the curve information of the lens surface of the eyeglass lens may be information capable of identifying the curve shape of the lens surface of the eyeglass lens (for example, at least one of the curve value, curvature, curvature radius, etc.).

[0019] For example, the angle information regarding the warpage of the eyeglass frame may be the warpage angle of the eyeglass frame when the eyeglass frame is observed from either the top or bottom direction. For example, the top direction of the eyeglass frame may be the state when the eyeglass frame is observed from the top of the rim to the bottom, and the bottom direction of the eyeglass frame may be the state when the eyeglass frame is observed from the bottom of the rim to the top. For example, the warpage angle of the eyeglass frame may be expressed as an angle formed by the bridge of the eyeglass frame and the lens shape formed by the rim of the eyeglass frame. In other words, it may be expressed as an angle formed by a line segment connecting the center of the bridge of the eyeglass frame and the point of the rim closest to the ear, and a line segment extending in the left-right direction from the bridge of the eyeglass frame.

[0020] For example, the angle information acquiring means may acquire angle information based on an operation signal input by an operator operating an operating means (for example, the monitor 4). Also, for example, the angle information acquiring means may acquire angle information based on a measurement result by an angle information measuring means described later. Also, for example, the angle information acquiring means may acquire angle information by receiving a measurement result using another device. Also, for example, the angle information acquiring means may acquire angle information using data in which at least one of angle information associated with each spectacle lens and angle information associated with each spectacle frame is stored in advance. For example, in this case, the angle information may be acquired by using an identifier of the spectacle lens or the spectacle frame to call up the corresponding data linked to the identifier from a memory, a server, a cloud, or the like.

[0021] The eyeglass lens measurement device of this embodiment may include an angle information measurement means (for example, an angle information measurement unit 80, a control unit 70). For example, the angle information measurement means may measure angle information of at least one of the eyeglass lens and the eyeglass frame.

[0022] For example, the angle information measurement means may include a configuration for measuring angle information related to the lens curve of the eyeglass lens. In this case, for example, the angle information measurement means may include a support mechanism for supporting at least two points on the lens surface of the eyeglass lens.

[0023] For example, the angle information measuring means may include a support mechanism (e.g., angle information measuring unit 80) having a fixed pin whose height is fixed regardless of the lens surface of the eyeglass lens and a movable pin whose height changes along the lens surface of the eyeglass lens, and may measure angle information related to the lens curve of the eyeglass lens based on the displacement of the movable pin relative to the fixed pin. For example, this allows the angle information of the eyeglass lens to be easily obtained by simply placing the eyeglass lens on the support mechanism.

[0024] For example, in such a support mechanism, a fixed pin (e.g., fixed pin 11a) may be disposed at a position through which the optical axis of the measurement light beam in the optical characteristic measuring means passes, or in the vicinity of the position through which the optical axis of the measurement light beam in the optical characteristic measuring means passes. Also, for example, in such a support mechanism, a movable pin (e.g., movable pin 11b) may be disposed at a position spaced apart in the meridian direction from the position through which the optical axis of the measurement light beam in the optical characteristic measuring means passes. In other words, the movable pin may be disposed at a position spaced apart in the meridian direction from the fixed pin.

[0025] For example, the movable pin may be at least one. For example, when there is one movable pin, the movable pin may be disposed at a position separated in either the left or right direction of the rim of the eyeglass lens supported by the support mechanism, and at a position separated in the meridian direction from the fixed pin. Also, for example, when there are multiple movable pins, the movable pins may be disposed at positions equally spaced apart in the meridian direction from the fixed pin. As an example, when there are three movable pins, the movable pins may be disposed at intervals of 120 degrees around the fixed pin. For example, this allows angle information related to the lens curve of the eyeglass lens to be measured more accurately.

[0026] For example, the fixed pin of the support mechanism may support a central region of the lens surface of the eyeglass lens. For example, the central region of the lens surface of the eyeglass lens may be a region including the optical center position of the eyeglass lens. As an example, it may be a region centered on the optical center position of the eyeglass lens. Also, for example, the movable pin of the support mechanism may support a peripheral region of the lens surface of the eyeglass lens. For example, the peripheral region of the lens surface of the eyeglass lens may be a region surrounding the central region of the lens surface of the eyeglass lens. For example, the peripheral region may be a region adjacent to the central region, or may be a region away from the central region. For example, this causes a larger load to be applied to the movable pin when the eyeglass lens is placed on the support mechanism, making it easier for the amount of displacement of the movable pin to appear large.

[0027] Also, for example, the angle information measuring means may include a support mechanism having a fixed part that fixes the position of the lens surface of the eyeglass lens and at least two movable pins whose height changes along the lens surface of the eyeglass lens, and may measure angle information related to the lens curve of the eyeglass lens based on the displacement amount of the at least two movable pins. For example, this allows the angle information of the eyeglass lens to be easily obtained by simply placing the eyeglass lens on the support mechanism.

[0028] For example, in such a support mechanism, the fixing part may be configured to fix the position of the lens surface of the eyeglass lens. For example, the fixing part may be configured to clamp the lens surface of the eyeglass lens, or to support a part of the eyeglass frame (for example, at least one of the bridge, the end piece, the temple, etc.). Also, for example, in such a support mechanism, one of the movable pins may be disposed at a position through which the optical axis of the measurement light beam in the optical characteristic measuring means passes, or in the vicinity of a position through which the optical axis of the measurement light beam in the optical characteristic measuring means passes. Also, for example, in such a support mechanism, the other movable pin may be disposed at a position spaced apart in the meridian direction based on a position through which the optical axis of the measurement light beam in the optical characteristic measuring means passes. In other words, the movable pin may be disposed at a position spaced apart in the meridian direction from the fixed pin.

[0029] For example, one movable pin of the support mechanism may support a central region of the lens surface of the eyeglass lens, and the other movable pin of the support mechanism may support a peripheral region of the lens surface of the eyeglass lens, which may result in a larger load being applied to the other movable pin when the eyeglass lens is placed on the support mechanism, making it easier for the amount of displacement of the other movable pin to be large.

[0030] For example, the angle information measuring means may include a configuration for measuring angle information related to the warping of the eyeglass frame. In this case, for example, the angle information measuring means may include an imaging means for imaging the eyeglass frame from the top-bottom direction, and may measure angle information related to the warping of the eyeglass frame based on the captured image captured by the imaging means.

[0031] For example, the angle information measuring means may include an imaging means for imaging the eyeglass frame from the top direction (above the rim). Also, for example, the angle information measuring means may include an imaging means for imaging the eyeglass frame from the bottom direction (below the rim). For example, the imaging means may have at least an imaging element. Of course, for example, the imaging means may have at least any optical member such as a lens, a mirror, an aperture, etc.

[0032] The eyeglass lens measurement device of this embodiment may include an interpupillary distance acquisition means (e.g., a control unit 70). For example, the interpupillary distance acquisition means acquires the interpupillary distance (first interpupillary distance) of the eyeglass lens based on the optical characteristics of the left lens and the optical characteristics of the right lens of the eyeglass lens. For example, the interpupillary distance acquisition means may acquire the distance between the optical center position based on the optical characteristics of the left lens and the optical center position based on the optical characteristics of the right lens as the first interpupillary distance.

[0033] The eyeglass lens measurement device of this embodiment may include a correction means (e.g., a control unit 70). For example, the correction means may correct the first interpupillary distance of the eyeglass lens based on the angle information and obtain the corrected interpupillary distance (second interpupillary distance).

[0034] For example, the correction means may obtain the corrected second interpupillary distance by directly correcting the first interpupillary distance of the eyeglass lens based on the angle information. As an example, in this case, the second interpupillary distance may be obtained using a table that associates the first interpupillary distance and angle information of the eyeglass lens with the second interpupillary distance. Also, as an example, in this case, the second interpupillary distance may be obtained using an arithmetic expression for calculating the second interpupillary distance from the first interpupillary distance and angle information of the eyeglass lens. For example, such a table or arithmetic expression may be set in advance based on experiments or simulations.

[0035] Also, for example, the correction means may obtain a corrected second interpupillary distance based on the corrected optical characteristics of the eyeglass lenses by correcting the optical characteristics of the left lens and the right lens of the eyeglass lenses based on the angle information. As an example, in this case, the second interpupillary distance may be obtained using a table that associates the optical characteristics and angle information of the eyeglass lenses with the second interpupillary distance. As an example, in this case, the second interpupillary distance may be obtained using an arithmetic expression for calculating the second interpupillary distance from the optical characteristics and angle information of the eyeglass lenses. For example, such a table or arithmetic expression may be set in advance based on an experiment or a simulation.

[0036] For example, the correction means may obtain the second interpupillary distance by correcting the refraction direction in which the measurement light flux from the optical characteristic measuring means is refracted by the spectacle lens based on angle information of the spectacle lens. That is, for example, the correction means may obtain the second interpupillary distance by correcting the refraction direction in which the measurement light flux is refracted by the spectacle lens based on at least one of angle information on the lens curve of the spectacle lens and angle information on the warp of the spectacle frame. For example, this allows the optical characteristics of the spectacle lens to be obtained with high accuracy, and as a result, the second interpupillary distance based on the optical characteristics of the spectacle lens to be obtained with high accuracy.

[0037] The eyeglass lens measurement device of this embodiment may include an output means (for example, a control unit 70). For example, the output means may output at least the second interpupillary distance of the eyeglass lens. For example, the output means may output both the first interpupillary distance and the second interpupillary distance of the eyeglass lens, or may output only the second interpupillary distance. Note that, for example, when the output means outputs both the first interpupillary distance and the second interpupillary distance, the output means may output the first interpupillary distance and the second interpupillary distance in a comparable manner. As an example, the first interpupillary distance and the second interpupillary distance may be output in a comparable manner by juxtaposing them. Also, as an example, the first interpupillary distance and the second interpupillary distance may be output in a comparable manner by switching between them.

[0038] For example, the output means may control the display means to cause the display means to display at least the second interpupillary distance. Also, for example, the output means may control the sound generation means (for example, a speaker) to cause the sound generation means to generate at least the second interpupillary distance as sound. Also, for example, the output means may control the printing means (for example, a printer) to cause the printing means to print at least the second interpupillary distance. Also, for example, the output means may control an external storage means (for example, a memory or a server) to transmit at least the second interpupillary distance to the external storage means. Of course, for example, the output means may execute a combination of these controls, or may execute a different control from these controls.

[0039] The present disclosure is not limited to the device described in the present embodiment. For example, the terminal control software (program) that performs the functions of the above embodiment can be supplied to a system or device via a network or various storage media, and the control device (e.g., CPU, etc.) of the system or device can read and execute the program.

[0040] <Example> An example of the eyeglass lens measuring device (hereinafter, measuring device) in this embodiment will be described. In this example, the left-right direction of the measuring device 1 is represented as the X direction, the up-down direction as the Y direction, and the front-rear direction as the Z direction.

[0041] FIG. 1 is an external view of a measuring device 1. For example, the measuring device 1 includes a housing 2, a storage section 3, a monitor 4, etc. The housing 2 has a storage section 3 therein. The storage section 3 stores a support unit 10, an optical property measuring unit, a control section 70, etc., which will be described later. The monitor 4 displays various information (for example, the optical properties of the lens LE, the distribution of the optical properties of the lens LE, etc.). For example, the monitor 4 in this embodiment is a touch panel, and also functions as an operation section used when an operator makes various settings. For example, an operation signal input from the monitor 4 is output to the control section 70.

[0042] FIG. 2 is a schematic diagram of the support unit 10, the angle information measuring unit 80, and the optical characteristic measuring unit. The support unit 10 is used to place the glasses. For example, the support unit 10 includes a positioning pin 11, a front support portion 12, a rear support portion 13, and the like. The positioning pin 11 is abutted against the rear surface of the lens LE framed in the glasses. The positioning pin 11 keeps the positional relationship between the lens LE and the transmissive display 24 constant. The positioning pin 11 also keeps the positional relationship between the lens LE and the imaging element 27 constant. The positioning pin 11 also serves as a part of the configuration of the angle information measuring unit 80 (see FIG. 3). The front support portion 12 supports a portion in front of the center of the glasses in the front-rear direction (in other words, the direction in which the temples FT of the glasses extend). The rear support portion 13 supports a portion in back of the center of the glasses in the front-rear direction.

[0043] For example, in the support unit 10 of this embodiment, the glasses are placed on the front support part 12 and the rear support part 13 with the upper end of the rim of the glasses facing upward and the lower end of the rim of the glasses facing downward. For example, the front support part 12 of this embodiment supports the bridge FB of the glasses. For example, the rear support part 13 supports the temples FT of the glasses. Note that the rear support part 13 is not limited to this embodiment, and may support the temples FM of the glasses as one example.

[0044] FIG. 3 is a diagram for explaining the details of the angle information measuring unit 80. FIG. 3(a) is a diagram of the angle information measuring unit 80 as viewed from the side. FIG. 3(b) is a diagram of the angle information measuring unit 80 as viewed from above. The angle information measuring unit 80 is used to measure angle information related to the lens curve of the lens LE. For example, the angle information measuring unit includes a base 81, a positioning pin 11, a detector 82, and the like. The base 81 is made of a transparent member (for example, an acrylic plate, etc.) to allow a measurement light beam from the measurement optical system 20 described later to pass therethrough. The positioning pin 11 is fixedly disposed on the base 81.

[0045] The positioning pin 11 has a fixed pin 11a and a movable pin 11b. For example, the height of the fixed pin 11a is fixed and is set in advance so that the upper surface of the fixed pin 11a is disposed at a predetermined distance H from the base 81 in the optical axis direction (Z direction). For example, the movable pin 11b is set at the same height as the fixed pin 11a. However, for example, the movable pin 11b is provided with a spring mechanism (not shown) therein, and is configured to be displaced the predetermined distance H by a load from the upper surface of the pin. The detector 82 detects the amount of displacement of such movable pin 11b. For example, the detector 82 may be a load sensor.

[0046] For example, the fixed pin 11a is disposed on the optical axis of the measurement light beam emitted by the measurement optical system 20. For example, the movable pin 11b is disposed at a different position in the meridian direction based on the optical axis of the measurement light beam emitted by the measurement optical system 20. As one example, the movable pin 11b is disposed either to the left (0 degree direction) or to the right (180 degree direction) of the fixed pin 11a.

[0047] For example, the distance in the X direction from the fixed pin 11a supporting the left lens LEl to the front support part 12 and the distance in the X direction from the fixed pin 11a supporting the right lens LEr to the front support part 12 are set in advance based on experiments and simulations. For example, the distance is set so that the central region W1 including the optical center position C of each lens is approximately placed on the upper surface of each fixed pin 11a. Also, for example, the distance in the X direction of the movable pin 11b relative to the fixed pin 11a is set in advance based on experiments and simulations. For example, the distance is set so that the peripheral region W2 away from the central region W1 of the lens is placed on the upper surface of the movable pin 11b.

[0048] For example, the lens LE is curved more as it approaches the edge of the frame (ear side or nose side). Therefore, by arranging the fixed pin 11a and the movable pin 11b as in this embodiment, a larger load is applied to the movable pin 11b, and the amount of displacement of the specified distance H is more likely to appear.

[0049] Returning to FIG. 2, the optical characteristic measuring unit is used to measure the optical characteristics of the lens LE. The optical characteristic measuring unit is also used to detect information other than the optical characteristics of the lens LE. As an example, the information other than the optical characteristics of the lens LE may be information regarding at least one of hidden marks, markings, print marks, outer shape, and the like.

[0050] For example, the optical property measuring unit includes a measuring optical system 20. For example, the measuring optical system 20 includes a light source 25, a transmissive display 24, a collimator lens 23, an image sensor 27, and the like.

[0051] For example, the light source 25 is a display. For example, the light source 25 irradiates a measurement light beam toward the lens LE. The light source 25 in this embodiment serves as both a light source for irradiating the measurement light beam to the left lens LEl and a light source for irradiating the measurement light beam to the right lens LEr. For example, the transmissive display 24 is a display with high transmittance that can transmit the measurement light beam from the light source 25. For example, the transmissive display 24 has a first transmissive display 24a and a second transmissive display 24b. For example, the first transmissive display 24a and the second transmissive display 24b are arranged at a predetermined distance D in the optical axis direction. For example, the collimator lens 23 shapes the measurement light beam from the light source 25 to be parallel (approximately parallel) to the optical axis. For example, the collimator lens 23 has a collimator lens 23l that shapes the measurement light beam irradiated to the left lens LEl and a collimator lens 23r that shapes the measurement light beam irradiated to the right lens LEr. For example, the imaging element 27 captures an image of the measurement light beam irradiated onto the lens LE. For example, the imaging element 27 has an imaging element 27l that captures an image of the measurement light beam irradiated onto the left lens LEl, and an imaging element 27r that captures an image of the measurement light beam irradiated onto the right lens LEr. The imaging elements 27l and 27r are focused near the front surfaces of the left lens LEl and the right lens LEr, respectively.

[0052] In this embodiment, the image sensor 27 is disposed on the front side of the lens LE, and the light source 25, the first transmissive display 24a, the second transmissive display 24b, and the light source 25 are disposed on the rear side of the lens LE. Of course, the measurement optical system 20 is not limited to this configuration, and various configurations can be used.

[0053] The transmissive display 24 can display or hide an index pattern (see JP 2021-105573 A for details) used to measure the optical characteristics of the lens LE. This allows different captured images to be obtained in a reference state in which the glasses are not placed on the support unit 10 and in a measurement state in which the glasses are placed on the support unit 10.

[0054] Fig. 4 is an example of a captured image when the first index pattern is displayed on the first transmissive display 24a. Fig. 5 is an example of a captured image when the second index pattern is displayed on the second transmissive display 24b. Figs. 4(a) and 5(a) show the reference state, and Figs. 4(b) and 5(b) show the measurement state. Here, the left lens LEl is a minus lens, and an image captured by the imaging element 27l on the side where the left lens LEl is disposed is taken as an example.

[0055] First, a reference state in which the glasses are not placed on the support unit 10 will be described. For example, when the first index pattern is displayed on the first transmissive display 24a, a reference image B1 including an image of the first index pattern (hereinafter, first index pattern image 41) is acquired as shown in FIG. 4(a). Also, when the second index pattern is displayed on the second transmissive display 24b, a reference image B2 including an image of the second index pattern (hereinafter, second index pattern image 51) is acquired as shown in FIG. 5(a). For example, since the first index pattern and the second index pattern are in the same position and in the same number, the pixel positions of the index images in the reference image B1 match the pixel positions of the index images in the reference image B2.

[0056] Next, a measurement state in which the glasses are placed on the support unit 10 will be described. For example, when the first index pattern is displayed on the first transmissive display 24a, the first index pattern image 41 is projected onto the left lens LEl. Therefore, as shown in FIG. 4B, a measurement image M1 including an image of the left lens LEl (hereinafter, referred to as a left lens image 60) and the first index pattern image 41 is acquired as a captured image. Also, for example, when the second index pattern is displayed on the second transmissive display 24b, the second index pattern image 51 is projected onto the left lens LEl. Therefore, as shown in FIG. 5B, a measurement image M2 including the left lens image 60 and the second index pattern image 51 is acquired as a captured image. For example, since the distance from the second transmissive display 24b to the lens LE is longer than the distance from the first transmissive display 24a to the lens LE, the second index pattern image 51 of the measurement image M2 becomes a smaller image than the first index pattern image 41 of the measurement image M1 due to the influence of the refractive power of the lens LE. Therefore, the pixel positions of the index images in the measuring image M1 do not necessarily coincide with the pixel positions of the index images in the measuring image M2.

[0057] If the lens LE is a plus lens, the second index pattern image 51 in the measurement image M2 will be larger than the first index pattern image 41 in the measurement image M1 due to the influence of the refractive power of the lens LE. If the lens LE is a progressive lens, the first index pattern image 41 in the measurement image M1 and the second index pattern image 51 in the measurement image M2 will each be an image that has changed according to the refractive power of the progressive band.

[0058] <Control Unit> 6 is a diagram showing a control system of the measurement device 1. For example, the control unit 70 is electrically connected to the monitor 4, the light source 25, the image sensor 27, the first transmissive display 24a, the second transmissive display 24b, a non-volatile memory 75 (hereinafter, memory 75), and the like.

[0059] For example, the control unit 70 is realized by a general CPU (processor), RAM, ROM, etc. For example, the CPU controls the driving of each part in the measurement device 1. For example, the RAM temporarily stores various information. For example, the ROM stores various programs executed by the CPU. Note that the control unit 70 may be configured by multiple control units (i.e., multiple processors).

[0060] The memory 75 may be a non-transient storage medium capable of retaining stored contents even when the power supply is cut off. For example, a hard disk drive, a flash ROM, a USB memory, an SD card, etc. may be used as the memory 75. For example, the memory 75 stores a reference image B1, a reference image B2, a measurement image M1, a measurement image M2, etc.

[0061] <Control action> A control operation of the measuring device 1 having the above-mentioned configuration will be described below. In this embodiment, a case where a single-focus lens is framed as the lens LE in the eyeglasses will be taken as an example.

[0062] <Placing glasses> An operator of the measurement device 1 places the eyeglasses on the support unit 10. For example, the operator places the bridge FB of the eyeglasses on the front support part 12, and the temples FT of the eyeglasses on the rear support part 13. This brings the positioning pins 11 into contact with the lens surfaces (here, the back surfaces) of the left lens LEl and the right lens LEr, respectively.

[0063] For example, the left lens LEl is supported at its central region W1 by the fixed pin 11a and at its peripheral region W2 by the movable pin 11b. At this time, the height of the upper surface of the movable pin 11b is displaced along the rear surface of the left lens LEl, so that the left lens LEl is supported at two points, the central region W1 and the peripheral region W2.

[0064] Similarly, for example, the right lens LEr has a central region W1 supported by a fixed pin 11a and a peripheral region W2 supported by a movable pin 11b. At this time, the height of the upper surface of the movable pin 11b is displaced along the lens back surface of the right lens LEr, so that the right lens LEr is supported at two points, the central region W1 and the peripheral region W2.

[0065] <Obtaining lens angle information> When an operator places the eyeglasses on the support unit 10, angular information related to the lens curve of the lens LE is measured by the angle information measuring unit 80. For example, the angular information related to the lens curve of the lens LE may be information expressed as a curve value, curvature, curvature radius, etc. of the lens surface, or may be information expressed as an inclination angle of the lens surface with respect to the horizontal direction (XY plane). Here, a case where the inclination angle of the lens surface is measured as the angular information of the lens LE is exemplified.

[0066] When the operator places the glasses on the support unit 10, the movable pin 11b is pressed down by the lens LE, causing the detector 82 to output a detection signal. For example, the detector 82 converts the load on the movable pin 11b into an electric signal and outputs it. The control unit 70 determines the amount of displacement Δh (see FIG. 3) of the movable pin 11b based on the electric signal corresponding to the load on the movable pin 11b. For example, the control unit 70 determines the amount of displacement using an arithmetic formula or a table for converting such an electric signal into an amount of displacement. The arithmetic formula or table may be set in advance by experiments, simulations, or the like, and stored in the memory 75.

[0067] The control unit 70 detects the positions in the optical axis direction (Z direction) of the upper surface of the fixed pin 11a and the upper surface of the movable pin 11b. For example, since the height (predetermined distance H) of the fixed pin 11a is known by design, the position Ma of the fixed pin 11a in the Z direction may be stored in the memory 75. For example, the height of the movable pin 11b is the height obtained by subtracting the displacement amount Δh from the predetermined distance H. Therefore, for example, the position Mb of the movable pin 11b in the Z direction is stored in the memory 75 as a position lower than the position Ma of the fixed pin 11a by the displacement amount Δh.

[0068] Furthermore, the control unit 70 determines a straight line G that passes through the Z-direction position Ma of the fixed pin 11a and the Z-direction position Mb of the movable pin 11b, and uses a trigonometric function to calculate the inclination angle γ of the lens rear surface with respect to the base 81. For example, such an inclination angle γ of the lens rear surface with respect to the horizontal direction is stored in the memory 75 as angle information of the lens LE.

[0069] <Getting pupil distance> Next, in order to obtain the interpupillary distance of the glasses, the operator operates the monitor 4 to select the measurement start button. In response to an input signal from the measurement start button, the control unit 70 controls the display of the transmissive display 24 to measure the optical characteristics of the left lens LEl and the right lens LEr, and obtains the interpupillary distance of the lens LE based on the measurement results of the optical characteristics of the left lens LEl and the right lens LEr.

[0070] First, the optical characteristics of the left lens LEl and the right lens LEr are measured. The control unit 70 turns on the light source 25. The control unit 70 also causes the first transmissive display 24a to display the first index pattern, but does not cause the second transmissive display 24b to display the second index pattern (i.e., the second transmissive display 24b is not displayed). The measurement light beam from the light source 25 passes through the second transmissive display 24b and the first transmissive display 24a, and is shaped into the first index pattern. Furthermore, the measurement light beam from the light source 25 is refracted by the lens LE, and is condensed by the condenser lens 23 to reach the image sensor 27. The control unit 70 acquires a measurement image M1 including the first index pattern image 41 and the lens image 60 based on the imaging result of the image sensor 27, and stores the measurement image M1 in the memory 75.

[0071] Next, the control unit 70 makes the first index pattern on the first transmissive display 24a invisible and makes the second transmissive display 24b display the second index pattern. The measurement light beam from the light source 25 passes through the second transmissive display 24b and is shaped into the second index pattern. After passing through the first transmissive display 24a, the measurement light beam is refracted by the lens LE and condensed by the condenser lens 23 to reach the image sensor 27. The control unit 70 obtains a measurement image M2 including the second index pattern image 51 and the lens image 60 based on the imaging result of the image sensor 27, and stores the measurement image M2 in the memory 75.

[0072] 7 is a schematic diagram showing a measurement light beam from the light source 25. The control unit 70 uses the passing positions of the measurement light beam from the light source 25 through two points in the optical axis direction to calculate at least one of the optical characteristics of the lens LE, such as spherical power, cylindrical power, and cylinder axis angle.

[0073] Here, the left lens LEl is taken as an example for explanation. For example, the position coordinates in the XY directions of an arbitrary point on the left lens LEl correspond to the pixel position of a predetermined index image in the reference image B1 and the pixel position of a predetermined index image in the reference image B2. As an example, the position coordinates in the XY directions of a measurement point Q1 on the left lens LEl correspond to the pixel position of a point Ta1 in the reference image B1 and the pixel position of a point Tb1 in the reference image B2.

[0074] For example, of the measurement light beam from the light source 25 toward the left lens LEl, the light ray R1 passing through the measurement point Q1 is refracted by the refractive power of the left lens LEl. For example, the control unit 70 detects that the light ray R1 passes through the first transmissive display 24a and the point Ta1 of the reference image B1 moves to the point Ta1' of the measurement image M1 by comparing the pixel positions of the respective index images in the reference image B1 and the pixel positions of the respective index images in the measurement image M1. Similarly, for example, the control unit 70 detects that the light ray R1 passes through the second transmissive display 24b and the point Tb1 of the reference image B2 moves to the point Tb1' of the measurement image M2 by comparing the pixel positions of the respective index images in the reference image B2 and the pixel positions of the respective index images in the measurement image M2.

[0075] Next, the control unit 70 calculates the refraction angle θ1 at which the light ray R1 from the light source 25 is refracted by the left lens LEl. For example, the refraction angle θ1 of the light ray R1 can be calculated from a trigonometric function using the distance D from the first transmissive display 24a to the second transmissive display 24b, the position coordinates in the XY directions of a point Ta1' at which the light ray R1 passes through the first transmissive display 24a, and the position coordinates in the XY directions of a point Tb1' at which the light ray R1 passes through the second transmissive display 24b.

[0076] For example, the control unit 70 calculates the refraction angle θ1 of the light ray R1 passing through the measurement point Q1 and the refraction angle θ2 of the light ray R2 passing through the measurement point Q2, among the measurement light beams from the light source 25 toward the left lens LEl. The control unit 70 also calculates the focal length f of the left lens LEl based on the positions of at least two points on the left lens LEl. For example, the control unit 70 calculates the focal length f based on the reference plane PT (position Ma of the fixing pin 11a) of the left lens LEl using the following formula. Note that the distance V from the placement surface PT to the first transmissive display 24a is known.

[0077]

number

[0078] The control unit 70 obtains the refractive power between the measurement points Q1 and Q2 based on the focal length f obtained between the measurement points Q1 and Q2 of the left lens LE1. For example, the refractive power is expressed as the reciprocal of the focal length f. For example, the control unit 70 may obtain the refractive power for each measurement point (in other words, the refractive power distribution) by repeating the calculation of the refraction angle of the light beam and the refractive power at a plurality of measurement points of the left lens LE1. For example, the refractive power for each measurement point of the lens LE may be spherical refractive power, cylindrical refractive power, cylinder axis angle, etc. Furthermore, for example, the refractive power for each measurement point of the lens LE may be an equivalent spherical refractive power based on the spherical refractive power and the cylindrical refractive power.

[0079] Also, for example, the control unit 70 may obtain the prism amount for each measurement point by multiplying the distance from the measurement point to the optical center position Oa by the spherical refractive power of the measurement point. For example, the prism amount of the measurement point may be expressed as a refraction angle of a light ray. Also, for example, the prism amount of the measurement point may be expressed by a prism amount Δx in the X direction and a prism amount Δy in the Y direction.

[0080] The control unit 70 obtains the refractive power (refractive power distribution) and the prism amount for each measurement point of the right lens LEr in a similar procedure.

[0081] When the optical characteristics of the left lens LEl and the right lens LEr are measured, the first interpupillary distance PD1 is calculated based on these measurement results. For example, the interpupillary distance PD1 may be calculated based on the optical center position Oa of the left lens LEl and the right lens LEr.

[0082] For example, the control unit 70 sets the measurement point where the refraction angle of the light beam is the smallest (as an example, the measurement point where the refraction angle of the light beam is 0 degrees) among multiple measurement points of the left lens LEl and the right lens LEr as the optical center position Oa of each lens. Also, for example, the control unit 70 specifies a pixel position corresponding to the optical center position Oa in the lens image 60 included in the measurement image M1 or the measurement image M2. Furthermore, for example, the control unit 70 determines the amount of deviation between the pixel position of the optical axis in the measurement image M1 or the measurement image M2 and the pixel position of the optical center position Oa, and converts this amount of deviation into an actual distance.

[0083] For example, the actual distance J (see FIG. 2) in the left-right direction (X direction) between the imaging element 27l that images the left lens LEl and the imaging element 27r that images the right lens LEr is known. Therefore, the control unit 70 can calculate the first interpupillary distance PD1 by adding or subtracting an actual distance based on the amount of deviation between the optical axis and the optical center position Oa from the actual distance J between the imaging elements. The control unit 70 stores the first interpupillary distance PD1 in the memory 75.

[0084] <Pupillary distance correction> In the measurement of the optical characteristics of the lens LE described above, it is not clear how much influence various parameters of the lens LE (for example, at least one of the inclination angle γ of the lens LE with respect to the horizontal direction, the refractive index, the edge thickness, etc.) have on the calculation of the refraction angle of the light beam at each measurement point. For example, the larger the inclination angle γ of the lens LE, the more the refraction angle of the light beam at each measurement point changes, making it more likely that an error will occur in the measurement results of the optical characteristics of the lens LE. Therefore, for example, the larger the inclination angle γ of the lens LE, the more likely that an error will occur in the first interpupillary distance PD1 calculated based on the optical characteristics of the lens LE.

[0085] Therefore, in this embodiment, at least the tilt angle γ is used as various parameters of the lens LE, and the refraction angle of the light beam at each measurement point is corrected based on the tilt angle γ to obtain the corrected optical characteristics of the left lens LEl and the right lens LEr. Also, based on the measurement results of the corrected optical characteristics of the left lens LEl and the right lens LEr, the corrected interpupillary distance (interpupillary distance PD2) of the lens LE is obtained.

[0086] First, the optical characteristics of the left lens LEl and the right lens LEr are corrected. For example, the control unit 70 constructs model shapes of the front and rear surfaces of the left lens LEl in order to correct the optical characteristics of the left lens LEl. Here, after acquiring a first front surface shape K1A indicating a provisional shape of the front surface of the left lens LEl and a first rear surface shape K1B indicating a provisional shape of the rear surface, the control unit 70 further acquires a first front surface shape K2A indicating a true shape of the front surface of the left lens LEl and a first rear surface shape K2B indicating a true shape of the rear surface, thereby constructing the model shape.

[0087] The control unit 70 acquires a tentative first front surface shape K1A of the left lens LEl. For example, the control unit 70 calls the refractive power of the optical center position Oa of the left lens LEl and the refractive index n of the left lens LEl from the memory 75. For example, the refractive index n of the left lens LEl may be stored in advance as a fixed value (for example, 1.5, etc.) in the memory 75. In addition, for example, the control unit 70 determines the front surface curve value P1 and the first front surface radius of curvature r1A of the left lens LEl based on the refractive power of the optical center position Oa of the left lens LEl and the refractive index n of the left lens LEl. For example, the refractive power of the optical center position Oa of the left lens LEl and the front surface curve value P1 are correlated, and the front surface curve value P1 can be estimated using the refractive power of the optical center position Oa.

[0088] FIG. 8 is a diagram showing the relationship between the refractive power of the optical center position Oa of the left lens LEl and the front curve value P1. The horizontal axis is the equivalent spherical refractive power of the optical center position Oa, and the vertical axis is the front curve value P1. For example, the greater the equivalent spherical refractive power of the optical center position Oa of the left lens LEl in the negative direction, the smaller the front curve value P1 tends to be. Also, for example, the greater the equivalent spherical refractive power of the optical center position Oa of the left lens LEl in the positive direction, the larger the front curve value P1 tends to be. For this reason, for example, the control unit 70 estimates the front curve value P1 of the left lens LEl by applying the equivalent spherical refractive power of the optical center position Oa of the left lens LEl to an arithmetic expression or table based on experiments or simulations.

[0089] For example, the control unit 70 calculates a provisional first front surface radius of curvature r1A of the left lens LEl based on the front surface curve value P1 of the left lens LEl and the refractive index n of the left lens LEl. For example, the control unit 70 calculates the provisional first front surface radius of curvature r1A of the left lens LEl by the following formula.

[0090]

number

[0091] For example, by determining the provisional first front surface radius of curvature r1A of the left lens LEl, the control unit 70 can grasp the position coordinates in the XYZ directions of each measurement point on the front surface of the left lens LEl and estimate the provisional first front surface shape K1A of the left lens LEl.

[0092] Next, the control unit 70 acquires a provisional first rear surface shape K1B of the left lens LEl. For example, the control unit 70 calculates a first rear surface radius of curvature r1B of the left lens LEl based on the refractive power of the optical center position Oa of the left lens LEl, the refractive index n of the left lens LEl, and the front surface curve value P1.

[0093] For example, the control unit 70 calculates the spherical refractive power S O and cylindrical power C OBased on the front surface curve value P1 of the left lens LEl and the refractive index n of the left lens LEl, the control unit 70 calculates a provisional first rear surface radius of curvature r1B of the left lens LEl. For example, the control unit 70 calculates the provisional first rear surface radius of curvature r1B of the left lens LEl by the following formula.

[0094] The provisional first rear surface radius of curvature r1B of the left lens LE1 may be set as a toric surface. In this case, the provisional first rear surface radius of curvature r1B is expressed by two principal radii of curvature, that is, a first rear surface radius of curvature r1B1 and a first rear surface radius of curvature r1B2.

[0095]

number

[0096] For example, by determining the provisional first rear surface radius of curvature r1B of the left lens LEl, the control unit 70 can grasp the position coordinates of each measurement point on the rear surface of the left lens LEl and estimate the provisional first rear surface shape K1B of the left lens LEl.

[0097] FIG. 9 is a diagram showing a provisional model and a true model (described later) of the left lens LEl. The control unit 70 constructs a provisional model α of the entire left lens LEl based on the provisional first front surface shape K1A and the provisional first rear surface shape K1B of the left lens LEl. The provisional first front surface shape K1A and the provisional first rear surface shape K1B of the left lens LEl are both obtained based on the refractive power of the optical center position Oa. For this reason, the provisional model α of the left lens LEl has a shape in which the position coordinates in the XYZ directions of the optical center position Oa are correct, but the position coordinates in the XYZ directions of other measurement points are not necessarily correct. In addition, for example, the provisional model α of the left lens LEl is a model in which the edge of the left lens LEl is considered to be sufficiently thin. Of course, it is also possible to obtain the edge thickness of the left lens LEl and construct a provisional model taking this into consideration.

[0098] When the control unit 70 constructs a provisional model α of the entire left lens LEl, it re-estimates either the provisional first front surface shape K1A or the provisional first rear surface shape K1B to obtain a true second front surface shape K2A indicating the true shape of the front surface of the left lens LEl, or a true second rear surface shape K2B indicating the true shape of the rear surface of the left lens LEl. As described above, the provisional model α correctly represents only the position coordinates in the XYZ directions of the optical center position Oa, and there is a possibility that the shape is such that different refractive powers are obtained at each measurement point. For this reason, an appropriate true model is reconstructed by re-estimating either the provisional first front surface shape K1A or the provisional first rear surface shape K1B.

[0099] The following will be described in detail. For example, the control unit 70 cuts out an area including a predetermined measurement point and its surroundings (for example, an area of ​​φ5 mm based on the predetermined measurement point) from the entire temporary model α of the left lens LEl to obtain a partial temporary model β1. Also, for example, the control unit 70 replaces the temporary first front surface shape K1A in the temporary model β1 with the true second front surface shape K2A. Also, for example, the control unit 70 replaces the temporary first rear surface shape K1B in the temporary model β1 with the true second rear surface shape K2B. This constructs a partial true model β2 of the left lens LEl, which has the true second front surface shape K2A and the true second rear surface shape K2B.

[0100] For example, the control unit 70 acquires the measurement point Q1 and its surroundings in the virtual model β1 of the left lens LEl as the real second front-front shape K1A in the real model β2. That is, the virtual first front-front shape K1A is used as it is as the real second front-front shape K2A.

[0101] For example, the true second front surface shape K2A in the true model β2 of the left lens LEl is expressed as follows: the position coordinate in the Z direction is calculated by the first differential coefficients I1 to I2 of the measurement point Q1, the second differential coefficients F1 to F3 of the measurement point Q1, and the position coordinate in the XY direction of the measurement point Q1 (X Q1 ,Y Q1 ), the position coordinates in the XY direction of the measurement point Q2 around the measurement point Q1 (XQ2 ,Y Q2 ) can be expressed by the following formula:

[0102]

number

[0103] The first-order differential coefficients I1 to I2 of the measurement point Q1 are parameters that respectively represent the tilt of the measurement point Q1 in the X direction and the Y direction, and the second-order differential coefficients F1 to F3 of the measurement point Q1 are parameters that respectively represent the two principal curvatures of the measurement point Q1 and the axial directions of the principal curvatures.

[0104] Next, for example, the control unit 70 obtains the true second back surface shape K2B in the true model β2 by re-estimating the measurement point Q1 in the virtual model β1 of the left lens LEl and the virtual first back surface shape K1B around it. For example, at the measurement point Q1 of the left lens LEl, the refractive power and the prism amount are measured by refracting a light ray R1 that is incident perpendicularly (i.e., parallel to the optical axis) on the mounting surface of the left lens LEl at the front and rear surfaces. As an example, the spherical refractive power S Q1 , cylindrical power C Q1 , astigmatism axis angle A Q1 , prism amount Δx Q1 , prism amount Δy Q1 However, for example, at a measurement point Q1 on a hypothetical model β1, when a ray R1 is refracted by the front and back surfaces, the spherical refractive power S Q1 Different spherical power S´ Q1 , cylindrical power C Q1 Different spherical power C´ Q1 , astigmatism axis angle A Q1 Different from the cylindrical axis angle A´ Q1 , prism amount Δx Q1 Different prism amount Δx´ Q1 , prism amount Δy Q1 Different prism amount Δy´ Q1 , etc. may be calculated.

[0105] Therefore, for example, the control unit 70 replaces the provisional first rear surface shape K1B of the provisional model β1 with the true second rear surface shape K2B of the real model β2 based on the refractive power and prism amount at the measurement point Q1 of the left lens LEl, the refractive index n of the left lens LEl, and the true second front surface shape K2A of the real model β2.

[0106] At this time, for example, the true model β2 is rotated so that the left lens LEl is inclined with respect to the mounting surface PT based on the inclination angle γ of the left lens LEl with respect to the horizontal direction. For example, the inclination angles in the X direction and the Y direction of each measurement point on the left lens LEl are changed based on the inclination angle γ of the left lens LEl with respect to the horizontal direction.

[0107] For example, the control unit 70 obtains the internal aberration after the light ray R1 incident on the measurement point Q1 is refracted at the front surface when the left lens LEl is tilted at an inclination angle γ (i.e., the aberration when the light ray R1 passes through the inside of the real model β2). As an example, the control unit 70 obtains such internal aberration by executing a ray tracing process for the light ray R1 using the real second front surface shape K2A of the measurement point Q1. For example, the control unit 70 then obtains the external aberration after the light ray R1 incident on the measurement point Q1 passes through the rear surface when the left lens LEl is tilted at an inclination angle γ. For example, the refractive power and prism amount of the measurement point Q1 correspond to such external aberration.

[0108] Furthermore, for example, the control unit 70 obtains the true second rear surface shape K2B in the true model β2 in a state in which the left lens LEl is tilted at a tilt angle γ, based on the refractive index n of the left lens LEl, and the internal and external aberrations. For example, the refractive index n of the left lens LEl is the same in the provisional model α and the true model β2, and the measurement light incident on the measurement point Q1 is a parallel light beam parallel to the optical axis (i.e., no aberration). Therefore, for example, the control unit 70 acquires the true second rear surface shape K2B by performing ray tracing processing of the light ray R1 so that the light ray R1 incident on the measurement point Q1 has internal aberration by passing through the front surface and has external aberration by passing through the rear surface.

[0109] For example, the true second rear surface shape K2B of the true model β2 of the left lens LEl is expressed as follows: the Z-direction position coordinates of the measurement point Q1 are the first-order differential coefficients I3 to I4, the second-order differential coefficients F4 to F6, and the XY-direction position coordinates of the measurement point Q1 (X Q1 ,Y Q1 ), the position coordinates in the XY direction of the measurement point Q2 around the measurement point Q1 (X Q2 ,Y Q2 ) can be expressed by the following formula:

[0110]

number

[0111] The first-order differential coefficients I3 to I4 of the measurement point Q1 are parameters that respectively represent the tilt of the measurement point Q1 in the X direction and the Y direction. The first-order differential coefficients I3 to I4 are coefficients that reflect the tilt angle γ of the left lens LEl. The second-order differential coefficients F4 to F6 of the measurement point Q1 are parameters that respectively include the two principal curvatures of the measurement point Q1 and the axial directions of the principal curvatures.

[0112] This allows, for example, at measurement point Q1 of the true model β2 of the left lens LEl, when the left lens LEl is tilted at an inclination angle β, to obtain a true second front surface shape K2A and a true second rear surface shape K2B such that a light ray R1 incident perpendicularly to the mounting surface of the left lens LEl is refracted at the front and rear surfaces, and a specified refractive power and prism amount are calculated.

[0113] For example, the control unit 70 may similarly cut out partial provisional models β1 for points other than the measurement point Q1, obtain the provisional first front surface shape K1A as the true second front surface shape K2A, and obtain the true second rear surface shape K2B to obtain partial true models β2 for each measurement point. Furthermore, for example, the control unit 70 may obtain an overall true model by connecting the partial true models β2 for each measurement point using the position information of each measurement point.

[0114] The control unit 70 uses such a model shape for the left lens LEl to obtain optical characteristics when the measurement light is incident on the left lens LEl by ray tracing of the measurement light. For example, the control unit 70 performs a simulation to obtain the corrected refractive power of the measurement point Q1, which is calculated by refracting the measurement light, which is incident on the mounting surface PT of the left lens LEl parallel to the optical axis, by the true second front surface shape K2A and further by the true second rear surface shape K2B. For example, the control unit 70 may perform a similar simulation for points other than the measurement point Q1 to obtain the corrected refractive power (in other words, the corrected refractive power distribution) for each measurement point.

[0115] The control unit 70 constructs the model shape of the right lens LEr and acquires the corrected refractive power (corrected refractive power distribution) for each measurement point on the right lens LEr in a similar procedure.

[0116] When the corrected optical characteristics of the left lens LEl and the right lens LEr are measured, the corrected second interpupillary distance PD2 is calculated based on these measurement results. For example, the interpupillary distance PD2 may be calculated based on the corrected optical center positions Ob of the left lens LEl and the right lens LEr.

[0117] FIG. 10 is a diagram showing the second interpupillary distance PD2 of the lens LE. For example, the control unit 70 sets the measurement point at which the refraction angle of the light beam is the smallest among a plurality of measurement points of the left lens LEl and the right lens LEr as the corrected optical center position Ob of each lens. In addition, for example, the control unit 70 calculates the amount of deviation in the left-right direction (X direction) between the optical center position Oa before correction and the optical center position Oa2 after correction in the left lens LEl. Similarly, for example, the control unit 70 calculates the amount of deviation in the left-right direction (X direction) between the optical center position Oa before correction and the optical center position Oa2 after correction in the right lens LEr. Furthermore, for example, the control unit 70 can calculate the corrected second interpupillary distance PD2 by adding or subtracting such deviation amount of the optical center position from the previously obtained first interpupillary distance PD1 before correction. The control unit 70 stores the second interpupillary distance PD2 in the memory 75.

[0118] <Interpupillary distance output> When the control unit 70 acquires the interpupillary distance of the lens LE, it outputs the same. For example, the control unit 70 causes at least the second interpupillary distance PD2 of the lens LE to be displayed on the monitor 4. Of course, for example, the control unit 70 may cause both the first interpupillary distance PD1 and the second interpupillary distance PD2 of the lens LE to be displayed on the monitor 4. Furthermore, for example, the control unit 70 may cause the monitor 4 to display optical characteristics together with the interpupillary distance of the lens LE.

[0119] As described above, for example, the eyeglass lens measuring device of this embodiment projects a measurement light beam onto a wide area of ​​the eyeglass lens set in the eyeglass frame, and receives the measurement light beam that has passed through the eyeglass lens to measure the optical characteristics of the eyeglass lens, obtains at least one of angle information on the lens curve of the eyeglass lens and angle information on the warp of the eyeglass frame, obtains a first pupillary distance of the eyeglass lens based on the optical characteristics of the left lens and the right lens of the eyeglass lens, corrects the first pupillary distance of the eyeglass lens based on the angle information to obtain a corrected second pupillary distance, and outputs the second pupillary distance of the eyeglass lens. As a result, for example, even if the eyeglass lens measuring device has the configuration of a so-called lens checker, it is possible to obtain the pupillary distance of the eyeglass lens with high accuracy.

[0120] In addition, for example, the eyeglass lens measurement device of this embodiment obtains the second interpupillary distance of the eyeglass lens by correcting the refraction direction in which the measurement light beam is refracted by the eyeglass lens based on the angle information of the eyeglass lens or the eyeglass frame. For example, this allows the optical characteristics of the eyeglass lens to be obtained with high accuracy, and as a result, the second interpupillary distance based on the optical characteristics of the eyeglass lens to be obtained with high accuracy.

[0121] In addition, for example, the eyeglass lens measurement device of the present embodiment measures angle information of at least one of the eyeglass lens and the eyeglass frame, and obtains angle information based on the measurement result. This makes it possible to easily obtain the second interpupillary distance of the eyeglass lens without having to measure angle information separately using a device different from the present device.

[0122] Also, for example, the spectacle lens measurement device of this embodiment is equipped with a support mechanism that supports at least two points on the lens surface of the spectacle lens, and has a fixed pin whose height is fixed regardless of the lens surface of the spectacle lens, and a movable pin whose height changes along the lens surface of the spectacle lens, and measures angle information related to the lens curve of the spectacle lens based on the displacement amount of the movable pin relative to the fixed pin. For example, this makes it possible to easily obtain angle information of the spectacle lens simply by placing the spectacle lens on the support mechanism.

[0123] In addition, for example, in the eyeglass lens measurement device of this embodiment, in a support mechanism that supports at least two points on the lens surface of the eyeglass lens, a fixed pin supports the central region of the lens surface, and a movable pin supports the peripheral region of the lens surface. For example, this causes a larger load to be applied to the movable pin when the eyeglass lens is placed on the support mechanism, and the amount of displacement of the movable pin is likely to be large. Therefore, the angle information of the eyeglass lens can be measured more accurately.

[0124] <Example of transformation> In the measurement device 1 of this embodiment, the angle information measurement unit 80 is described as having a fixed pin 11a and a movable pin 11b, but is not limited thereto. For example, the angle information measurement unit 80 may be configured to have at least two movable pins. Note that, for example, in this case, the angle information measurement unit 80 may further include a fixing portion for fixing the left lens LEl and the right lens LEr.

[0125] For example, in this embodiment, the support unit 10 may play the role of a fixing part for fixing the lens LE in the angle information measurement unit 80. For example, the glasses are placed on the front support part 12 and the rear support part 13, and the bridge FB and temple FT of the glasses are supported, so that the glasses are fixed and the lens LE is fixed and the two movable pins are pushed down. For example, the control unit 70 obtains the displacement amount of each movable pin based on an electric signal corresponding to the load of the two movable pins. Also, for example, the control unit 70 obtains the position (height) of the movable pin in the Z direction by subtracting the displacement amount from a predetermined distance H. Furthermore, for example, the control unit 70 obtains a straight line passing through the positions of the two movable pins in the Z direction, and calculates the inclination angle γ of the lens back surface with respect to the base 81 using a trigonometric function. For example, the inclination angle γ of the lens back surface with respect to the horizontal direction may be acquired as the angle information of the lens LE using the angle information measurement unit 80 in this manner.

[0126] In the measuring device 1 of the present embodiment, a configuration for acquiring angle information (for example, the inclination angle γ of the lens surface of the lens LE) on the lens curve of the lens LE framed in the eyeglass frame has been exemplified, but the present invention is not limited thereto. The measuring device 1 may be configured to acquire angle information on the warp of the eyeglass frame. For example, the measuring device 1 may be configured to acquire the warp angle of the eyeglass frame when the eyeglass frame is observed from either the top or bottom direction as the angle information. For example, the top direction of the eyeglass frame may be the state in which the eyeglass frame is observed from the top side of the rim, and the bottom direction of the eyeglass frame may be the state in which the eyeglass frame is observed from the bottom side of the rim. Also, for example, the warp angle of the eyeglass frame may be expressed as an angle formed by the bridge of the eyeglass frame and the lens shape formed by the rim of the eyeglass frame. In other words, the angle may be expressed as an angle formed by a line segment connecting the center of the bridge of the eyeglass frame and the point of the rim closest to the ear, and a line segment extending in the left-right direction from the bridge of the eyeglass frame as a base point.

[0127] For example, when the measuring device 1 acquires angle information regarding the warpage of the eyeglass frame, the measuring device 1 may include an imaging optical system for capturing an image of the eyeglass frame from either the top or bottom direction. For example, the imaging optical system may have at least an imaging element. For example, the control unit 70 may acquire angle information of the eyeglass frame based on an image captured by the imaging optical system. As an example, the control unit 70 may process the image captured by the imaging optical system and detect the bridge and rim to obtain the inclination angle.

[0128] In the measurement device 1 of this embodiment, the interpupillary distance of the lens LE is obtained by using the inclination angle γ of the lens LE with respect to the horizontal direction, but the present invention is not limited to this. The measurement device 1 may be configured to obtain the interpupillary distance by using at least one of the refractive index and edge thickness of the lens LE together with the inclination angle γ of the lens LE.

[0129] For example, the refractive index of the lens LE may be obtained by inputting a value measured in advance by the operator using a refractive index measuring device, etc. Also, for example, the refractive index of the lens LE may be obtained by transferring a value measured in advance by the operator using a refractive index measuring device, etc. For example, by taking into account the correct refractive index of the lens LE, the interpupillary distance of the lens LE can be calculated with higher accuracy.

[0130] For example, the edge thickness of the lens LE may be obtained by inputting a value measured in advance by the operator using an edge thickness measuring device or the like. Also, for example, the edge thickness of the lens LE may be obtained by transferring a value measured in advance by the operator using an edge thickness measuring device or the like. Of course, for example, the edge thickness of the lens LE may be stored in the memory 75 as a fixed value (for example, 5 mm, etc.). For example, by taking into account the correct edge thickness of the lens LE, the interpupillary distance of the lens LE can be calculated with higher accuracy.

[0131] In the measurement device 1 of this embodiment, a configuration is exemplified in which the interpupillary distance PD1 (actual measurement value) measured using a lens checker is corrected to an actual interpupillary distance PD2 (corrected value) that takes into account the deviation caused by the lens checker, but the present invention is not limited to this. More specifically, a configuration is exemplified in which the optical characteristics of the lens LE are re-obtained by correcting the refraction direction (e.g., refraction angle) in which the measurement light that is incident on the lens LE parallel to the optical axis is refracted by the lens LE, and the corrected interpupillary distance PD2 is obtained, but the present invention is not limited to this. The measurement device 1 may be configured to correct the interpupillary distance PD1 (actual measurement value) measured using a lens checker to an interpupillary distance PD2 (corrected value) that can be measured using a lens meter.

[0132] For example, in this case, the incident direction (e.g., incident angle) of the measurement light may be corrected so that the measurement light incident on the lens LE parallel to the optical axis becomes the measurement light perpendicular to the rear surface of the lens LE. Furthermore, for example, the refraction direction in which the measurement light passing through the lens LE is refracted may be corrected by performing ray tracing processing of such measurement light on the lens LE. For example, this makes it possible to obtain the optical characteristics when the lens LE is measured with a lens meter, and as a result, it is possible to obtain the interpupillary distance PD2 that can be measured using the lens meter. [Explanation of symbols]

[0133] 1 Eyeglass lens measuring device 10 Support Unit 20 Measurement optical system 21 Light source 24 Transmissive Display 27 Image sensor 70 Control section 80 Angle Information Measurement Unit 75 Memory

Claims

1. An eyeglass lens measuring device for measuring the optical properties of eyeglass lenses, An optical properties measuring means for measuring the optical properties of the eyeglass lens by projecting a measuring light beam onto a wide area of ​​the eyeglass lens, which is framed in an eyeglass frame, and receiving the measuring light beam that has passed through the eyeglass lens, An angle information acquisition means for acquiring angle information relating to the lens curve of the eyeglass lens and angle information relating to the curvature of the eyeglass frame, A means for acquiring the interpupillary distance of the eyeglass lens, based on the optical properties of the left lens and the right lens of the eyeglass lens, Correction means for correcting the first interpupillary distance of the eyeglass lens based on the angle information and obtaining the corrected second interpupillary distance, An output means for outputting the second interpupillary distance of the eyeglass lens, An eyeglass lens measuring device characterized by comprising the following features.

2. In the spectacle lens measuring device according to claim 1, The spectacle lens measuring device is characterized in that the correction means obtains the second interpupillary distance by correcting the refraction direction in which the measurement light beam is refracted by the spectacle lens based on the angle information.

3. In the spectacle lens measuring device according to claim 1 or 2, The system includes an angle information measuring means for measuring the angle information of at least one of the eyeglass lens and the eyeglass frame, The spectacle lens measuring device is characterized in that the angle information acquisition means acquires the angle information based on the measurement results of the angle information measuring means.

4. In the spectacle lens measuring device of claim 3, The spectacle lens measuring device is characterized in that the angle information measuring means comprises a support mechanism that supports at least two points on the lens surface of the spectacle lens.

5. A spectacle lens measurement program used in a spectacle lens measuring device for measuring the optical properties of spectacle lenses, This is executed by the processor of the aforementioned eyeglass lens measuring device, An optical properties measurement step involves projecting a measurement light beam onto a wide area of ​​the spectacle lens, which is framed in a spectacle frame, and receiving the measurement light beam that has passed through the spectacle lens to measure the optical properties of the spectacle lens. An angle information acquisition step of acquiring angle information relating to the lens curve of the eyeglass lens and angle information relating to the curvature of the eyeglass frame, A pupillary distance acquisition step, which involves acquiring the first interpupillary distance of the eyeglass lens based on the optical characteristics of the left lens and the optical characteristics of the right lens of the eyeglass lens, A correction step of correcting the first interpupillary distance of the eyeglass lens based on the angle information and obtaining the corrected second interpupillary distance, An output step that outputs the second interpupillary distance of the eyeglass lens, A spectacle lens measurement program characterized by causing the spectacle lens measuring device to execute the following.

Images