Eyeglass lens measurement device and eyeglass lens measurement program

Abstract

To provide an eyeglass lens measurement device and an eyeglass lens measurement program with which it is possible to suitably acquire the optical characteristics of eyeglass lenses.SOLUTION: The eyeglass lens measurement device comprises: measurement means for projecting a measurement beam as parallel beams to a wide area of an eyeglass lens and receiving the measurement beams having passed through the eyeglass lens, and thereby measuring the first optical characteristic of at least one measurement point where measurement light has entered the eyeglass lens at a first incidence angle; position information acquisition means for acquiring the position information of the measurement point; front-shape information acquisition means for acquiring front-shape information that is the front-shape information of the eyeglass lens and includes at least the measurement point; rear-shape information acquisition means for acquiring rear-shape information that is the rear-shape information of the eyeglass lens and includes at least the measurement point; arithmetic means for acquiring a second optical characteristic when measurement light entered at a second incidence angle, on the basis of the first optical characteristic, position information, front-shape information and rear-shape information of the measurement point; and output means for outputting at least the second optical characteristic.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] As described above, the lens checker is capable of measuring a wide range of eyeglass lenses. However, because the lens checker has such a configuration, for example, the lens checker and the lens meter may obtain different measurement results even when measuring the same eyeglass lens.

[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 suitably acquiring the optical characteristics of a spectacle lens. [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 measurement device according to a first aspect of the present disclosure is a spectacle lens measurement device for measuring optical characteristics of a spectacle lens, comprising: a measurement means for projecting a measurement light beam as a parallel light beam onto a wide area of ​​the spectacle lens and receiving the measurement light beam that has passed through the spectacle lens, thereby measuring a first optical characteristic of at least one measurement point at which the measurement light, which is a part of the measurement light beam, is incident on the spectacle lens at a first incidence angle; a position information acquisition means for acquiring position information of the measurement point on the spectacle lens; a front surface shape information acquisition means for acquiring front surface shape information of the spectacle lens, the front surface shape information including at least the measurement point; a rear surface shape information acquisition means for acquiring rear surface shape information of the spectacle lens, the rear surface shape information including at least the measurement point; a calculation means for acquiring a second optical characteristic when the measurement light is incident at a second incidence angle different from the first incidence angle, based on the first optical characteristic of the measurement point, the position information, the front surface shape information, and the rear surface shape information; and an output means for outputting at least the second optical characteristic. (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 measurement device that measures optical characteristics of a spectacle lens, and when executed by a processor of the spectacle lens measurement device, the program includes a measurement step of projecting a measurement light beam as a parallel light beam onto a wide area of ​​the spectacle lens and receiving the measurement light beam that has passed through the spectacle lens, thereby measuring a first optical characteristic of at least one measurement point at which measurement light, which is a part of the measurement light beam, is incident on the spectacle lens at a first incidence angle; a position information acquisition step of acquiring position information of the measurement point on the spectacle lens; and The method is characterized in that the eyeglass lens measurement device is caused to execute the following steps: a front surface shape information acquisition step of acquiring front surface shape information of the eyeglass lens, the front surface shape information including at least the measurement point; a rear surface shape information acquisition step of acquiring rear surface shape information of the eyeglass lens, the rear surface shape information including at least the measurement point; a calculation step of acquiring second optical characteristics when the measurement light is incident at a second incidence angle different from the first incidence angle based on a first optical characteristic of the measurement point, the position information, the front surface shape information, and the rear surface shape information; and an output step of outputting at least the second optical characteristic. (3) A spectacle lens measurement device according to a third aspect of the present disclosure is a spectacle lens measurement device for measuring optical characteristics of a spectacle lens, comprising: a measurement means for projecting a measurement light beam onto a wide area of ​​the spectacle lens as a parallel light beam and receiving the measurement light beam that has passed through the spectacle lens, thereby measuring first optical characteristics at at least a first measurement point at the optical center of the spectacle lens and a second measurement point different from the first measurement point, the first measurement point being a measurement point where the measurement light, which is a part of the measurement light beam, is incident on the spectacle lens at a first incidence angle; a calculation means for projecting the measurement light beam onto the spectacle lens based on the first optical characteristics of the first measurement point and the second measurement point and position information of the second measurement point, and acquiring second optical characteristics at the second measurement point when the measurement light beam is incident on the second measurement point at a second incidence angle perpendicular to the rear surface of the spectacle lens; and an output means for outputting at least the second optical characteristics. [Brief description of the drawings]

[0007] [Figure 1] FIG. 1 is an external view of a spectacle lens measuring device. [Diagram 2] FIG. 2 is a schematic diagram of a support unit and a measurement unit. [Diagram 3] 1 is an example of an index pattern that can be displayed on a transmissive display. [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 measuring device. [Figure 7] FIG. 2 is a schematic diagram showing a measurement light beam emitted from a light source. [Figure 8] FIG. 2 is a diagram showing the relationship between the first refractive power at the optical center position of the lens and the front surface curve value. [Figure 9] FIG. 2 is a diagram illustrating a virtual model and a true model of a lens. [Figure 10] 4A and 4B are diagrams illustrating the incidence angle of measurement light in a lens checker and a lens meter. [Figure 11] 13 is an example of a display screen when the lens is a single focal length lens. [Figure 12] 13 is an example of a display screen when the lens is a progressive power lens. [Figure 13] FIG. 1 is a diagram showing a schematic view of a state in which a spectacle wearer is wearing the spectacle. 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 the present embodiment measures the optical characteristics of an eyeglass lens. For example, the eyeglass lens measuring device may measure the optical characteristics of an unprocessed lens (in other words, a raw lens) before it is processed to fit the shape of an eyeglass frame. Also, for example, the eyeglass lens measuring device may measure the optical characteristics of a processed lens after it is processed to fit the shape of an eyeglass frame. For example, in this case, the processed lens may be in a state of being framed in an eyeglass frame, or may not be in a state of being framed. For example, the optical characteristics of the eyeglass lens may be at least one of the refractive power of the eyeglass lens, the amount of prism, and the like. 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, and the like. 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 a measuring means (e.g., a measuring optical system 20, a control unit 70). For example, the measuring means may project a measuring light beam as a parallel light beam onto a wide area of ​​the eyeglass lens, and receive the measuring light beam that has passed through the eyeglass lens, thereby measuring a first optical characteristic of at least one measuring point where the measuring light, which is a part of the measuring light beam, is incident on the eyeglass lens at a first incident angle. For example, the measuring means may measure the first optical characteristic at one measuring point. Also, for example, the measuring means may measure the first optical characteristic at a plurality of measuring points. As an example, in this case, the first optical characteristic may be measured at least at a first measuring point at the optical center of the eyeglass lens and a second measuring point different from the first measuring point.

[0011] For example, the measurement means projects the measurement light as a parallel light beam (approximately parallel light beam) onto a wide area of ​​the spectacle lens, thereby projecting the measurement light as a parallel light beam (approximately parallel light beam) onto a predetermined measurement point of the spectacle lens. Therefore, for example, the first incidence angle of the measurement light is an angle parallel (approximately parallel) to the measurement optical axis of the measurement light beam for any measurement point of the spectacle lens. For example, when the mounting surface of the spectacle lens is provided perpendicular to the measurement optical axis of the measurement light beam, the first incidence angle of the measurement light is an angle of 90 degrees (approximately 90 degrees) from the mounting surface of the spectacle lens. Note that, for example, in such a state, when the rear surface of the measurement point of the spectacle lens is considered as a reference, an angle other than 90 degrees with respect to the tangent (tangent surface) of the rear surface of the spectacle lens becomes the first incidence angle of the measurement light.

[0012] For example, the measuring means may comprise a measuring optical system for measuring the optical properties of the spectacle lens. For example, the measuring optical system may comprise at least a light source, an index pattern member and a detector.

[0013] 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.

[0014] 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.

[0015] 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.

[0016] 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.

[0017] The eyeglass lens measurement device of this embodiment may include a refractive index acquisition means (e.g., a control unit 70). For example, the refractive index acquisition means acquires the refractive index of the eyeglass lens. For example, the refractive index of the eyeglass lens is used as an index indicating the thickness of the eyeglass lens. For example, the larger the refractive index of the eyeglass lens, the thinner the eyeglass lens, and the smaller the refractive index of the eyeglass lens, the thicker the eyeglass lens.

[0018] For example, the refractive index acquisition means may acquire the refractive index input by an operator operating an operation means (for example, the monitor 4). For example, the refractive index acquisition means may acquire the refractive index by receiving a measurement result using another device (for example, a refractive index measuring device, etc.). For example, the refractive index acquisition means may acquire the refractive index previously associated with each spectacle lens by accessing a cloud or the like. As an example, in this case, the refractive index associated with the identifier may be called up from the accumulated data using an identifier for each spectacle lens (for example, a character string, a one-dimensional code, a two-dimensional code, a color code, etc.). For example, the refractive index acquisition means may calculate the refractive index based on at least one of the front surface shape information (described later) or the back surface shape information (described later) of the spectacle lens and the lens thickness information of the spectacle lens (for example, the thickness of the spectacle lens).

[0019] The eyeglass lens measurement device of this embodiment may include a position information acquisition means (e.g., a control unit 70). For example, the position information acquisition means may acquire position information of a measurement point on an eyeglass lens. For example, the position information of a measurement point on an eyeglass lens may be information that can represent the position of the measurement point on the eyeglass lens. As an example, it may be at least any information such as a position coordinate relative to a predetermined reference position, a distance in the meridian direction relative to the predetermined reference position, etc. Note that, for example, the predetermined reference position may be the optical center position of the eyeglass lens, or a position where the prism amount of the eyeglass lens is smallest. Of course, for example, the predetermined reference position may be any position different from these.

[0020] For example, the position information acquiring means may acquire the position information of the measurement point on the eyeglass lens by receiving a measurement result using another device (for example, a lens shape measuring device, etc.). Also, for example, the position information acquiring means may acquire the position information of the measurement point by measurement using the measuring means. As an example, in this case, the position information of the measurement point may be acquired by performing a ray tracing process of the measurement light passing through the measurement point on the eyeglass lens. Also, as an example, in this case, the position information of the measurement point may be acquired by performing a calculation process based on a captured image including at least the eyeglass lens and an actual distance per pixel. More specifically, for example, the position information of the measurement point may be acquired by converting the number of pixels from a predetermined reference position to the measurement point in the captured image of the eyeglass lens into an actual distance. Of course, the position information acquiring means may acquire the position information of the measurement point by performing a process other than the ray tracing process or the calculation process.

[0021] The eyeglass lens measuring device of this embodiment may include a front surface shape information acquiring means (e.g., a control unit 70). For example, the front surface shape information acquiring means may acquire the front surface shape information of the eyeglass lens, which includes at least a measurement point. For example, the front surface shape information acquiring means may acquire the front surface shape information of one measurement point. Also, for example, the front surface shape information acquiring means may acquire the front surface shape information for each of a plurality of measurement points. Also, for example, the front surface shape information acquiring means may acquire the front surface shape information in an area including one measurement point or an area including a plurality of measurement points. For example, the front surface shape information of the eyeglass lens may be information that can represent the shape of the front surface of the eyeglass lens. As an example, it may be at least any one of information such as a curve value, a curvature, a radius of curvature, a spherical equation, or an aspherical equation.

[0022] For example, the front surface shape information acquiring means may acquire the front surface shape information input by the operator operating the operating means. For example, the front surface shape information acquiring means may acquire the front surface shape information by receiving a measurement result using another device (for example, a curve measuring device, etc.). For example, the front surface shape information acquiring means may acquire the front surface shape information associated in advance with each spectacle lens by accessing a cloud or the like. As an example, in this case, the identifier for each spectacle lens may be used to call up the front surface shape information associated with the identifier from the accumulated data. For example, the front surface shape information acquiring means may acquire the front surface shape information by estimating the front surface shape information of the spectacle lens. As an example, in this case, the front surface shape information may be estimated based on the optical characteristics and the refractive index of the spectacle lens.

[0023] The eyeglass lens measuring device of this embodiment may include a rear surface shape information acquiring means (e.g., a control unit 70). For example, the rear surface shape information acquiring means may acquire rear surface shape information of the eyeglass lens, which includes at least a measurement point. For example, the rear surface shape information acquiring means may acquire rear surface shape information of one measurement point. Also, for example, the rear surface shape information acquiring means may acquire rear surface shape information for each of a plurality of measurement points. Also, for example, the rear surface shape information acquiring means may acquire rear surface shape information in an area including one measurement point or an area including a plurality of measurement points. For example, the rear surface shape information of the eyeglass lens may be information that can represent the shape of the rear surface of the eyeglass lens. As an example, it may be at least any one of information such as a curve value, a curvature, a radius of curvature, a spherical equation, or an aspheric equation.

[0024] For example, the rear shape information acquiring means may acquire rear shape information input by an operator operating the operating means. For example, the rear shape information acquiring means may acquire rear shape information by receiving a measurement result using another device (for example, a curve measuring device, etc.). For example, the rear shape information acquiring means may acquire rear shape information associated in advance with each spectacle lens by accessing a cloud or the like. As an example, in this case, an identifier for each spectacle lens may be used to call up the rear shape information associated with the identifier from among the accumulated data. For example, the rear shape information acquiring means may acquire rear shape information by estimating the rear shape information of the spectacle lens. As an example, in this case, the rear shape information may be estimated based on the optical characteristics, refractive index, and front shape information of the spectacle lens.

[0025] For example, in this embodiment, the front surface shape information acquisition means may acquire, as the front surface shape information, provisional first front surface shape information based on the optical characteristics of the optical center position of the spectacle lens and the refractive index of the spectacle lens. As an example, the provisional first front surface shape information of the spectacle lens may be front surface shape information temporarily estimated for calculation by the calculation means described later. In other words, it may be approximate (rough) front surface shape information of the spectacle lens. Also, for example, in this embodiment, the rear surface shape information acquisition means may acquire, as the rear surface shape information, provisional first rear surface shape information based on the optical characteristics of the optical center position of the spectacle lens, the refractive index of the spectacle lens, and the provisional first front surface shape information of the spectacle lens. As an example, the provisional first rear surface shape information of the spectacle lens may be rear surface shape information temporarily estimated for calculation by the calculation means described later. In other words, it may be approximate (rough) rear surface shape information of the spectacle lens. For example, by using the optical characteristics and the refractive index of the optical center position of the spectacle lens, the provisional first front surface shape information and the provisional first rear surface shape information of the spectacle lens can be easily estimated. As an example, by deriving at least one of the tentative first front surface shape information and the tentative first rear surface shape information from the correlation between the optical characteristics and the refractive index of the optical center position of the eyeglass lens, the tentative first front surface shape information and the tentative first rear surface shape information can be easily estimated.

[0026] For example, when the front surface shape information acquisition means acquires the provisional first front surface shape information, the front surface shape information acquisition means may acquire the provisional first front surface shape information by using a table based on the optical characteristics and refractive index of the optical center position and referring to each of them. Also, for example, the front surface shape information acquisition means may acquire the provisional first front surface shape information by using an arithmetic expression based on the optical characteristics and refractive index of the optical center position and substituting each of them. For example, such a table or arithmetic expression may be created in advance based on an experiment or a simulation and stored in a storage means (for example, memory 75).

[0027] For example, when the rear surface shape information acquisition means acquires the provisional first rear surface shape information, the rear surface shape information acquisition means may acquire the provisional first rear surface shape information by using a table based on the optical characteristics of the optical center position of the spectacle lens, the refractive index of the spectacle lens, and the provisional first front surface shape information of the measurement point, and by referring to each of them. Also, for example, the rear surface shape information acquisition means may acquire the provisional first rear surface shape information by using an arithmetic expression based on the optical characteristics of the optical center position, the refractive index, and the provisional first front surface shape information, and by substituting each of them. For example, such a table or arithmetic expression may be created in advance based on an experiment or a simulation, and stored in the storage means.

[0028] For example, the provisional first front surface shape information and the provisional first rear surface shape information may both be represented as spherical shapes. For example, the provisional first front surface shape information and the provisional first rear surface shape information may both be represented as aspherical shapes. For example, one of the provisional first front surface shape information and the provisional first rear surface shape information may be represented as a spherical shape, and the other may be represented as an aspherical shape.

[0029] For example, in this embodiment, the front surface shape information acquisition means may acquire true second front surface shape information, which assumes that the first optical characteristic is measured at the measurement point, based on the first optical characteristic of the measurement point of the spectacle lens and the provisional first rear surface shape information of the measurement point, as the front surface shape information. For example, in other words, when the measurement light is incident on the measurement point of the spectacle lens, the measurement point has the true second front surface shape information and the provisional first rear surface shape information, so that the first optical characteristic is measured, and the true second front surface shape information may be acquired. For example, that is, the true second front surface shape information of the spectacle lens may be front surface shape information in which the actual front surface shape of the spectacle lens is reproduced. For example, by replacing at least the provisional first front surface shape information of the provisional first front surface shape information and the provisional first rear surface shape information of the measurement point with the true second front surface shape information, the second optical characteristic of the measurement point can be acquired more accurately by the calculation means described later.

[0030] For example, when the front surface shape information acquisition means acquires the true second front surface shape information, the front surface shape information acquisition means may estimate the true second front surface shape information based on ray tracing using the first optical characteristic of the measurement point and the provisional first rear surface shape information. For example, the front surface shape information acquisition means may acquire the true second front surface shape information by using a table based on the first optical characteristic of the measurement point and the provisional first rear surface shape information and referring to each of them. Also, for example, the front surface shape information acquisition means may acquire the true second front surface shape information by using an arithmetic expression based on the first optical characteristic of the measurement point and the provisional first rear surface shape information and substituting each of them. For example, such a table or arithmetic expression may be created in advance based on an experiment or a simulation and stored in the storage means.

[0031] For example, in this embodiment, the rear surface shape information acquisition means may acquire true second rear surface shape information, which assumes that the first optical characteristic is measured at the measurement point, based on the first optical characteristic of the measurement point of the spectacle lens and the provisional first front surface shape information of the measurement point. For example, in other words, the true second rear surface shape information may be acquired such that the measurement point has the provisional first front surface shape information and the true second rear surface shape information when the measurement light is incident on the measurement point of the spectacle lens, so that the first optical characteristic is measured. For example, that is, the true second rear surface shape information of the spectacle lens may be rear surface shape information in which the actual rear surface shape of the spectacle lens is reproduced. For example, by replacing at least the provisional first rear surface shape information of the provisional first front surface shape information and the provisional first rear surface shape information of the measurement point with the true second rear surface shape information, the second optical characteristic of the measurement point can be acquired more accurately by the calculation means described later.

[0032] For example, when the rear surface shape information acquisition means acquires the true second rear surface shape information, the rear surface shape information acquisition means may estimate the true second rear surface shape information based on ray tracing using the first optical characteristic of the measurement point and the provisional first front surface shape information. For example, the rear surface shape information acquisition means may acquire the true second rear surface shape information by using a table based on the first optical characteristic of the measurement point and the provisional first front surface shape information and referring to each of them. Also, for example, the rear surface shape information acquisition means may acquire the true second rear surface shape information by using an arithmetic expression based on the first optical characteristic of the measurement point and the provisional first front surface shape information and substituting each of them. For example, such a table or arithmetic expression may be created in advance based on an experiment or a simulation and stored in the storage means.

[0033] For example, the true second anterior surface shape information and the true second posterior surface shape information may both be represented as aspherical shapes. For example, the true second anterior surface shape information and the true second posterior surface shape information may both be represented as spherical shapes. For example, one of the true second anterior surface shape information and the true second posterior surface shape information may be represented as a spherical shape, and the other may be represented as an aspherical shape.

[0034] The spectacle lens measurement device of this embodiment may include a calculation means (for example, a control unit 70). For example, the calculation means may acquire a second optical characteristic when the measurement light is incident at a second incident angle different from the first incident angle based on the first optical characteristic of the measurement point of the spectacle lens, the position information of the measurement point, the front surface shape information of the measurement point, and the rear surface shape information of the measurement point. For example, the calculation means may acquire the second optical characteristic at one measurement point. Also, for example, the calculation means may acquire the second optical characteristic at a plurality of measurement points. Thereby, for example, while the measurement means is configured to measure the first optical characteristic when the measurement light is projected at the first incident angle, the second optical characteristic when the measurement light is projected at the second incident angle can be acquired with high accuracy.

[0035] For example, the calculation means may acquire the second optical characteristic of the measurement point by acquiring model shape information of the eyeglass lens. For example, the model shape information of the eyeglass lens may be model shape information showing the entire shape of the eyeglass lens. That is, it may be model shape information showing a shape including all measurement points on the eyeglass lens. Also, for example, the model shape of the eyeglass lens may be model shape information showing a shape of a part (in other words, a predetermined area) of the eyeglass lens. That is, it may be model shape information showing a shape including at least one measurement point on the eyeglass lens. For example, by constructing the model shape information of the eyeglass lens, the positional relationship of each measurement point on the eyeglass lens can be easily grasped. Therefore, for example, the second optical characteristic when the measurement light is incident on the eyeglass lens at the second incident angle can be more easily acquired.

[0036] For example, when the calculation means acquires model shape information of the eyeglass lens, the calculation means may acquire model shape information constructed based on the front shape information of the measurement point acquired by the front shape information acquisition means and the rear shape information of the measurement point acquired by the rear shape information acquisition means. Furthermore, for example, the calculation means may acquire second optical characteristics of the measurement point based on the first optical characteristics of the measurement point, position information of the measurement point, and the model shape information.

[0037] For example, the calculation means may acquire the second optical characteristic of the measurement point based on the first optical characteristic of the measurement point, the position information of the measurement point, the provisional first front surface shape information of the measurement point, and the provisional back surface shape information of the measurement point. For example, when the calculation means acquires model shape information of the eyeglass lens, the calculation means may acquire provisional model shape information constructed based on the provisional first front surface shape information and the provisional first back surface shape information, and may acquire the second optical characteristic of the measurement point based on the first optical characteristic of the measurement point, the position information of the measurement point, and the provisional model shape information.

[0038] For example, the calculation means may acquire the second optical characteristic of the measurement point based on the first optical characteristic of the measurement point, the position information of the measurement point, the true first front surface shape information of the measurement point, and the provisional back surface shape information of the measurement point. For example, when the calculation means acquires model shape information of the spectacle lens, the calculation means may acquire true model shape information constructed based on the true second front surface shape information and the provisional first back surface shape information, and may acquire the second optical characteristic of the measurement point based on the first optical characteristic of the measurement point, the position information of the measurement point, and the true model shape information.

[0039] For example, the calculation means may acquire the second optical characteristic of the measurement point based on the first optical characteristic of the measurement point, the position information of the measurement point, the tentative first front surface shape information of the measurement point, and the true back surface shape information of the measurement point. For example, when the calculation means acquires model shape information of the eyeglass lens, the calculation means may acquire true model shape information constructed based on the tentative first front surface shape information and the true second back surface shape information, and may acquire the second optical characteristic of the measurement point based on the first optical characteristic of the measurement point, the position information of the measurement point, and the true model shape information.

[0040] For example, the calculation means may acquire the second optical characteristic of the measurement point by executing a ray tracing process based on the first optical characteristic of the measurement point of the spectacle lens, the position information of the measurement point, the front surface shape information of the measurement point (provisional first front surface shape information or real second front surface shape information), and the back surface shape information of the measurement point (provisional first back surface shape information or real second back surface shape information).As one example, the second optical characteristic may be acquired by calculating the optical aberration caused by the measurement point having the front surface shape information and the back surface shape information by the ray tracing process.

[0041] For example, the calculation means may acquire the second optical characteristic by reproducing various states in which the measurement point is irradiated with the measurement light at the second incident angle.

[0042] For example, the calculation means may acquire the second optical characteristic by setting the angle at which the measurement light is perpendicular to the rear surface of the eyeglass lens as the second incidence angle. For example, the state in which the eyeglass lens is placed on the nosepiece of the lens meter may be reproduced, and the angle at which the measurement optical axis of the measurement light is perpendicular (almost perpendicular) to the tangent (tangential surface) of the rear surface of the eyeglass lens may be set as the second incidence angle. Note that, for example, in this case, the second incidence angle of the measurement light is an angle of 90 degrees (almost 90 degrees) with respect to the tangent (tangential surface) of the rear surface of the eyeglass lens.

[0043] For example, the calculation means may acquire the second optical characteristic by setting the angle at which the measurement light coincides with the visual axis in the state of wearing the glasses as the second incident angle. For example, the state in which the glasses wearer wears the glasses may be reproduced, and the angle at which the visual axis of the glasses wearer and the measurement optical axis of the measurement light irradiated to the glasses lens coincide (or almost coincide) with each other may be set as the second incident angle in a state in which the optical axis of the glasses lens is shifted from the visual axis of the glasses wearer. For example, the optical axis of the glasses lens may be an axis that is perpendicular to at least one of the front surface and the rear surface of the glasses lens and passes through the optical center position of the glasses lens.

[0044] The eyeglass lens measurement device of this embodiment may include an output means (for example, a control unit 70). For example, the output means outputs at least the second optical characteristic when the measurement light is incident at the second incident angle at the measurement point of the eyeglass lens. For example, the output means may output only the second optical characteristic at the measurement point of the eyeglass lens. Also, for example, the output means may output both the first optical characteristic and the second optical characteristic at the measurement point of the eyeglass lens. Note that, for example, in this case, the first optical characteristic and the second optical characteristic may be output in a comparable manner. As an example, the first optical characteristic and the second optical characteristic may be output in a comparable manner by juxtaposing them. Also, as an example, the first optical characteristic and the second optical characteristic may be output in a comparable manner by switching between them.

[0045] For example, when the output means acquires the first optical characteristic of a plurality of measurement points on the spectacle lens, the output means may output the first optical characteristic as a distribution. Similarly, when the output means acquires the second optical characteristic of a plurality of measurement points on the spectacle lens, the output means may output the second optical characteristic as a distribution. For example, the distribution of at least one of the first optical characteristic and the second optical characteristic may be expressed as an image that allows recognition of an area where the optical characteristics of each measurement point are equal. As an example, it may be an image in which the areas where the optical characteristics of each measurement point are equal are connected by an isodimeter line. As another example, it may be an image in which the areas where the optical characteristics of each measurement point are equal are colored. This allows visual confirmation of the characteristics of the spectacle lens. In particular, in progressive lenses, etc., the size and arrangement of the far-use portion, intermediate portion, near-use portion, etc. of the progressive lens can be easily grasped.

[0046] For example, the output means may control the display means and cause the display means to display the first optical characteristic and the second optical characteristic. Also, for example, the output means may control the sound generation means (for example, a speaker) and cause the sound generation means to generate the first optical characteristic and the second optical characteristic as sound. Also, for example, the output means may control the printing means (for example, a printer) and cause the printing means to print the first optical characteristic and the second optical characteristic. Also, for example, the output means may control an external storage means (for example, a memory or a server) and transmit the first optical characteristic and the second optical characteristic to the external storage means. Of course, for example, the output means may execute a control that combines these, or may execute a control different from these.

[0047] The eyeglass lens measurement device of the present embodiment may include a measuring means for projecting a measurement light beam as a parallel light beam onto a wide area of ​​the eyeglass lens and receiving the measurement light beam that has passed through the eyeglass lens, thereby measuring a first optical characteristic at at least a first measurement point at the optical center of the eyeglass lens and a second measurement point different from the first measurement point, which are measurement points where the measurement light, which is a part of the measurement light beam, is incident on the eyeglass lens at a first incident angle. The eyeglass lens measurement device may also include a calculation means for projecting a measurement light beam onto the eyeglass lens based on the first optical characteristics of the first and second measurement points and the position information of the second measurement point, and acquiring a second optical characteristic at the second measurement point when the measurement light is incident on the second measurement point at a second incident angle perpendicular to the rear surface of the eyeglass lens. The eyeglass lens measurement device may also include an output means for outputting at least the second optical characteristic.

[0048] 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.

[0049] <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.

[0050] 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, a measuring unit, a control section 70, etc., which will be described later. The monitor 4 displays various information (for example, the optical characteristics of the lens LE, the distribution of the optical characteristics 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.

[0051] FIG. 2 is a schematic diagram of the support unit 10 and the measurement 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 a transmissive display 24 (described later) constant. The positioning pin 11 also keeps the positional relationship between the lens LE and an imaging element 27 (described later) constant. 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 behind the center of the glasses in the front-rear direction.

[0052] 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.

[0053] The measurement unit is used to measure the optical characteristics of the lens LE. The measurement 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, etc. For example, the measurement unit includes a measurement optical system 20. For example, the measurement optical system 20 includes a light source 25, a transmissive display 24, a collimator lens 23, an image sensor 27, etc.

[0054] 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 both as 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 capable of transmitting 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.

[0055] 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.

[0056] The transmissive display 24 can display or hide an index pattern 30 used to measure the optical characteristics of the lens LE. Fig. 3 shows an example of the index pattern 30. Fig. 3(a) shows a first index pattern 30a displayed on the first transmissive display 24a. Fig. 3(b) shows a second index pattern 30b displayed on the second transmissive display 24b.

[0057] First, the first index pattern 30a will be described. For example, the first index pattern 30a has an index 31a. For example, the index 31a is composed of a peripheral index 32a and a reference index 33a. For example, the peripheral index 32a is provided around the reference index 33a in advance with a predetermined shape, a predetermined position, and a predetermined number. In this embodiment, the peripheral index 32a is circular. Also, in this embodiment, a plurality of peripheral indexes 32a are provided at equal intervals based on the passing position of the optical axis Nl and the passing position of the optical axis Nr. As a result, the peripheral index 32a is provided in each of the area on the side where the left lens LEl is arranged and the area on the side where the right lens LEr is arranged.

[0058] For example, the reference index 33a is provided in advance with a predetermined shape, a predetermined position, a predetermined number, etc., so that it can be distinguished from the peripheral indexes 32a. In this embodiment, the reference index 33a is a circular index larger than the peripheral indexes 32a. In addition, in this embodiment, the reference index 33a is provided so as to be symmetrical up and down and left and right with respect to the passing position of the optical axis Nl and the passing position of the optical axis Nr.

[0059] Next, the second index pattern 30b will be described. For example, the second index pattern 30b has an index 31b. For example, the index 31b is composed of a peripheral index 32b and a reference index 33b. For example, the peripheral index 32b is provided in advance around the reference index 33b with a predetermined shape, a predetermined position, and a predetermined number, etc. In this embodiment, the peripheral index 32b is a square. Also, in this embodiment, a plurality of peripheral indexes 32b are provided at equal intervals based on the passing position of the optical axis Nl and the passing position of the optical axis Nr. As a result, the peripheral index 32b is provided in each of the area on the side where the left lens LEl is arranged and the area on the side where the right lens LEr is arranged.

[0060] For example, the reference index 33b is provided in advance with a predetermined shape, a predetermined position, a predetermined number, etc., so that it can be distinguished from the peripheral index 32b. In this embodiment, the reference index 33b is a rectangular shape larger than the peripheral index 32b. In addition, in this embodiment, the reference index 33b is provided so as to be symmetrical up and down and left and right with respect to the passing position of the optical axis Nl and the passing position of the optical axis Nr.

[0061] In this embodiment, the first index pattern 30a of the first transmissive display 24a and the second index pattern 30b of the second transmissive display 24b have the same configuration except for the shapes of the indexes 31a and 31b. At least one of the shapes, positions, numbers, etc. of the indexes 31a and 31b may be different. Of course, the shapes, positions, numbers, etc. of the indexes 31a and 31b may all be the same.

[0062] For example, by switching between displaying and not displaying the index pattern 30 on the transmissive display 24, different captured images are obtained by the imaging element 27. FIG. 4 is an example of a captured image when the first index pattern 30a is displayed on the first transmissive display 24a. FIG. 4(a) shows a state in which the glasses are not placed on the support unit 10. FIG. 4(b) shows a state in which the glasses are placed on the support unit 10. FIG. 5 is an example of a captured image when the second index pattern 30b is displayed on the second transmissive display 24b. FIG. 5(a) shows a state in which the glasses are not placed on the support unit 10. FIG. 5(b) shows a state in which the glasses are placed on the support unit 10. Note that here, an image captured by the imaging element 27l (the side where the left lens LEl is arranged) is taken as an example. The left lens LEl is a minus lens.

[0063] First, a state where the glasses are not placed on the support unit 10 (hereinafter, the reference state) will be described. For example, when the first index pattern 30a is displayed on the first transmissive display 24a, a reference image B1 including an image of the first index pattern 30a (hereinafter, the first index pattern image 41) is acquired as shown in FIG. 4(a). Also, when the second index pattern 30b is displayed on the second transmissive display 24b, a reference image B2 including an image of the second index pattern 30b (hereinafter, the second index pattern image 51) is acquired as shown in FIG. 5(a). In this embodiment, the indexes 31a of the first index pattern 30a and the indexes 31 of the second index pattern 30b are in the same positions and in the same number, so that the pixel positions of the index images in the reference image B1 and the pixel positions of the index images in the reference image B2 match.

[0064] Next, a state where the glasses are placed on the support unit 10 (hereinafter, measurement state) will be described. For example, when the first index pattern 30a 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. 4(b), a measurement image M1 including an image of the left lens LEl (hereinafter, 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 30b 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. 5(b), a measurement image M2 including the left lens image 60 and the second index pattern image 51 is acquired as a captured image. In this embodiment, 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 in the measurement image M2 becomes smaller than the first index pattern image 41 in the measurement image M1 due to the influence of the refractive power of the lens LE. Therefore, the pixel position of each index image in the measurement image M1 does not necessarily match the pixel position of each index image in the measurement image M2.

[0065] For example, 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. Also, for example, 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.

[0066] <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.

[0067] 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).

[0068] 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.

[0069] <Control action> A control operation of the measurement 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.

[0070] An operator of the measurement device 1 places the eyeglasses on the support unit 10. The operator also operates the operation unit (monitor 4) to input the refractive index of the lens LE. For example, a refractive index measured in advance using a refractive index measuring device for measuring the refractive index of eyeglass lenses may be input. The control unit 70 stores the refractive index in the memory 75 in response to an operation signal from the operation unit. The refractive index of the lens LE may be stored in advance in the memory 75 as a fixed value (for example, 1.5).

[0071] <Acquisition of the first optical characteristic (Step 1)> The operator operates the operation unit to operate a switch (not shown) for starting measurement of the first optical characteristic of the lens LE. The control unit 70 starts the measurement in response to an operation signal from the operation unit. For example, the control unit 70 turns on the light source 25. Also, for example, the control unit 70 causes the first transmissive display 24a to display the first index pattern 30a. The control unit 70 does not cause the second transmissive display 24b to display the second index pattern 30b. In this case, the measurement light beam from the light source 25 passes through the first transmissive display 24a and the second transmissive display 24b and is simultaneously irradiated onto the left lens LEl and the right lens LEr. Also, the measurement light beam from the light source 25 is refracted by the left lens LEl and the right lens LEr, respectively, and reaches the image sensor 27 via the collimator lens 23.

[0072] The control unit 70 obtains a measurement image by processing the electrical signal captured by the imaging element 27. For example, the control unit 70 obtains a measurement image M1 including an image of the left lens LEl and an image of the first index pattern 30a based on the imaging result of the imaging element 27l. Similarly, for example, the control unit 70 obtains a measurement image M1 including an image of the right lens LEr and an image of the first index pattern 30a based on the imaging result of the imaging element 27r. The control unit 70 stores these measurement images M1 in the memory 75.

[0073] Next, the control unit 70 makes the first index pattern 30a of the first transmissive display 24a invisible and makes the second index pattern 30b of the second transmissive display 24b visible. In this case, the measurement light beam from the light source 25 passes through the first transmissive display 24a and the second transmissive display 24b, is irradiated simultaneously onto the left lens LEl and the right lens LEr, and reaches the image sensor 27 via the collimator lens 23. As a result, for example, the control unit 70 obtains a measurement image M2 including an image of the left lens LEl and an image of the second index pattern 30b, and a measurement image M2 including an image of the right lens LEr and an image of the second index pattern 30b. The control unit 70 stores these measurement images M2 in the memory 75.

[0074] The control unit 70 acquires the optical characteristics of the left lens LEl and the right lens LEr based on the reference image B1 and the measurement image M1, and the reference image B2 and the measurement image M2. For example, the control unit 70 acquires the optical characteristics of the left lens LEl and the right lens LEr by using the interval between the images of the indices 31a forming the image of the first index pattern 30a (hereinafter, the first index pattern image 41) in the measurement image M1, and the interval between the images of the indices 31b forming the image of the second index pattern 30b (hereinafter, the second index pattern image 51) in the measurement image M2, and the like.

[0075] FIG. 7 is a schematic diagram showing a measurement light beam irradiated by a light source 25. FIG. 7 shows the side where the left lens LEl is arranged, and does not show the side where the right lens LEr is arranged. 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.

[0076] 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.

[0077] 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.

[0078] 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. That is, the control unit 70 calculates the refraction angles of the light beams at at least two positions on the left lens LEl. In addition, the control unit 70 calculates the focal length f of the left lens LEl and the optical center position O 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 and the optical center position O of the left lens LEl based on the placement surface PT 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.

[0079]

number

[0080] Furthermore, the control unit 70 calculates the refractive power between the measurement points Q1 and Q2 based on the focal length f calculated between the measurement points Q1 and Q2 on the left lens LEl. For example, the refractive power is expressed as the reciprocal of the focal length f.

[0081] For example, the control unit 70 repeats the calculation of the refraction angle and the refractive power of the light beam at a plurality of measurement points including the optical center position O of the left lens LEl to obtain the first refractive power (in other words, the refractive power distribution) for each measurement point. The control unit 70 also obtains the first refractive power (refractive power distribution) for each measurement point of the right lens LEr by a similar procedure. For example, as such a first refractive power, a spherical refractive power, a cylindrical refractive power, an astigmatism axis angle, etc. may be obtained. Note that, for example, as the first refractive power, an equivalent spherical refractive power based on the spherical refractive power and the cylindrical refractive power may also be obtained.

[0082] For example, the control unit 70 obtains the first prism amount for each measurement point by multiplying the spherical refractive power of the measurement point by the distance from the measurement point to the optical center position O. For example, the first prism amount may be expressed by a prism amount Δx in the X direction and a prism amount Δy in the Y direction.

[0083] For example, the control unit 70 may determine the refraction angle θ1 of the light ray R1 as the first prism amount at the measurement point Q1. Similarly, for example, the control unit 70 may determine the refraction angle θ2 of the light ray R2 as the first prism amount at the measurement point Q2.

[0084] <Obtaining the temporary front and back shapes (Step 2)> For example, when the control unit 70 acquires the first optical characteristic (here, the first refractive power and the prism amount) of the lens LE, it turns off the light source 25, the first transmissive display 24a, and the second transmissive display 24b. In addition, for example, the control unit 70 acquires a first front surface shape K1A indicating a provisional shape of the front surface of the lens LE and a first rear surface shape K1B indicating a provisional shape of the rear surface of the lens LE.

[0085] For example, first, the control unit 70 acquires a provisional first front surface shape K1A of the lens LE. For example, the control unit 70 retrieves the first refractive power at the optical center position O of the lens LE and the refractive index n of the lens LE from the memory 75, and acquires the provisional first front surface shape K1A by calculating the front surface curve value P1 and the first front surface curvature radius r1A of the lens LE based on these.

[0086] For example, the control unit 70 acquires a front surface curve value P1 of the lens LE based on a first refractive power at the optical center position O of the lens LE. For example, the first refractive power at the optical center position O of the lens LE and the front surface curve value P1 are correlated, and the front surface curve value P1 can be estimated using the first refractive power at the optical center position O.

[0087] FIG. 8 is a diagram showing the relationship between the first refractive power at the optical center position O of the lens LE and the front curve value P1. The horizontal axis is the equivalent spherical refractive power at the optical center position O, and the vertical axis is the front curve value P1. For example, the greater the equivalent spherical refractive power at the optical center position O of the lens LE in the negative direction, the smaller the front curve value P1 tends to be. Also, for example, the greater the equivalent spherical refractive power at the optical center position O of the lens LE 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 lens LE by applying the equivalent spherical refractive power at the optical center position O of the lens LE to an arithmetic expression or table based on experiments or simulations.

[0088] For example, the control unit 70 calculates a tentative first front surface radius of curvature r1A of the lens LE based on the front surface curve value P1 of the lens LE and the refractive index n of the lens LE. For example, the control unit 70 calculates the tentative first front surface radius of curvature r1A of the lens LE by the following formula.

[0089]

number

[0090] For example, by determining the provisional first front surface radius of curvature r1A of the lens LE, the control unit 70 can grasp the position coordinates in the XYZ directions of each measurement point on the front surface of the lens LE and estimate the provisional first front surface shape K1A of the lens LE.

[0091] Next, the control unit 70 acquires a provisional first rear surface shape K1B of the lens LE. For example, the control unit 70 acquires the provisional first rear surface shape K1B by calculating a first rear surface curvature radius r1B of the lens LE based on a first refractive power at the optical center position O of the lens LE, a refractive index n of the lens LE, and a front surface curve value P1.

[0092] For example, the control unit 70 calculates the first spherical refractive power S at the optical center position O of the lens LE. O and the first cylinder power C O Based on the front curve value P1 of the lens LE and the refractive index n of the lens LE, the control unit 70 acquires a provisional first rear radius of curvature r1B of the lens LE. For example, the control unit 70 calculates the provisional first rear radius of curvature r1B of the lens LE by the following formula.

[0093] The provisional first rear surface radius of curvature r1B of the lens LE 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, namely, a first rear surface radius of curvature r1B1 and a first rear surface radius of curvature r1B2.

[0094]

number

[0095] For example, by determining the provisional first rear surface radius of curvature r1B of the lens LE, the control unit 70 can grasp the position coordinates of each measurement point on the rear surface of the lens LE and estimate the provisional first rear surface shape K1B of the lens LE.

[0096] FIG. 9 is a diagram showing a provisional model and a true model (described later) of the lens LE. For example, the control unit 70 may construct a provisional model α of the lens LE based on a provisional first front surface shape K1A and a provisional first rear surface shape K1B of the lens LE. For example, the provisional first front surface shape K1A and the provisional first rear surface shape K1B are both obtained based on the first refractive power of the optical center position O. For this reason, the provisional model α has a shape in which the position coordinates of the optical center position O in the XYZ directions are correct, but the position coordinates of other measurement points in the XYZ directions are not necessarily correct. Also, for example, the provisional model α may be a model in which the edge of the lens LE is considered to be sufficiently thin. Of course, the thickness of the edge of the lens LE may be obtained and a provisional model considering this may be constructed.

[0097] <Acquiring the true front and back shapes (Step 3)> For example, the control unit 70 constructs a provisional model α of the entire lens LE, and then 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 lens LE, or a true second rear surface shape K2B indicating the true shape of the rear surface of the lens LE. As described above, the provisional model α correctly represents only the position coordinates in the XYZ directions of the optical center position O, and each measurement point may have a shape that provides a refractive power different from the first refractive power. 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.

[0098] This will be described in detail below. 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 lens LE 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 lens LE, which is a partial true model β2 and has the true second front surface shape K2A and the true second rear surface shape K2B.

[0099] For example, the control unit 70 acquires the measurement point Q1 and a provisional first front-face shape K1A around the measurement point Q1 in the provisional model β1 of the lens LE as the true second front-face shape K1A in the true model β2. That is, the provisional first front-face shape K1A is used as it is as the true second front-face shape K2A.

[0100] For example, the true second front shape K2A in the true model β2 has its Z-direction position coordinates calculated by the first-order differential coefficients I1 to I2 of the measurement point Q1, the second-order differential coefficients F1 to F3 of the measurement point Q1, and the XY-direction position coordinates (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 ), it can be expressed by the following formula. The first-order differential coefficients I1 and I2 of the measurement point Q1 are parameters that respectively represent the tilt of the measurement point Q1 in the X direction and the tilt of the measurement point Q1 in the Y direction. 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.

[0101]

number

[0102] Next, for example, the control unit 70 acquires the true second back surface shape K2B in the true model β2 by re-estimating the measurement point Q1 in the provisional model β1 of the lens LE and the provisional first back surface shape K1B around it. For example, at the measurement point Q1 of the lens LE, a light ray R1 that is incident perpendicularly to the mounting surface of the lens LE (i.e., parallel to the measurement optical axis N) is refracted by the front and rear surfaces, thereby measuring the first refractive power and the first prism amount. As an example, the first spherical refractive power S Q1 , first cylinder power C Q1 , 1st astigmatism axis angle A Q1 , the first prism amount Δx Q1 , the first prism amount Δy Q1 , etc. are measured. However, for example, at a measurement point Q1 on the hypothetical model β1, when a ray R1 is refracted by the front and back surfaces, the first spherical refractive power S Q1 Different spherical power S´ Q1 , first cylinder power C Q1 Different spherical power C´ Q1 , 1st astigmatism axis angle A Q1 Different from the cylindrical axis angle A´ Q1 , the first prism amount Δx Q1 The first prism amount Δx´ is different from Q1 , the first prism amount Δy Q1 The first prism amount Δy´ is different from Q1 , etc. may be calculated.

[0103] Therefore, for example, the control unit 70 replaces the hypothetical first rear surface shape K1B of the hypothetical model β1 with the true second rear surface shape K2B of the real model β2 based on the first refractive power and the first prism amount at the measurement point Q1 of the lens LE, the refractive index n of the lens LE, and the true second front surface shape K2A of the real model β2.

[0104] For example, first, 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 (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, next, the control unit 70 obtains the external aberration after the light ray R1 incident on the measurement point Q1 passes through the rear surface. For example, the first refractive power and the first prism amount of the measurement point Q1 correspond to such external aberration.

[0105] Furthermore, for example, the control unit 70 obtains the true second back surface shape K2B in the true model β2 based on the refractive index n of the lens LE, and the internal and external aberrations. For example, the refractive index n of the lens LE 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 measurement optical axis N (i.e., no aberration). For this reason, for example, the control unit 70 acquires the true second back 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.

[0106] For example, the true second rear surface shape K2B of the true model β2 has its Z-direction position coordinates calculated by the first-order differential coefficients I3 to I4 of the measurement point Q1, the second-order differential coefficients F4 to F6 of the measurement point Q1, and the XY-direction position coordinates (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 ), the following formula can be used. 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 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.

[0107]

number

[0108] As a result, for example, at a measurement point Q1 of the true model β2 of the lens LE, a light ray R1 incident perpendicularly to the mounting surface of the lens LE is refracted at the front and rear surfaces, and a true second front surface shape K2A and a true second rear surface shape K2B are obtained from which the first refractive power and the first prism amount are calculated.

[0109] 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.

[0110] <Acquisition of the second optical characteristic (Step 4)> The measuring device 1 of this embodiment has a so-called lens checker configuration, and can obtain the first refractive power and the first prism amount based on the measurement principle of the lens checker by measuring the lens LE with the measurement optical system 20. However, the measuring device 1 can obtain the second refractive power and the second prism amount based on the measurement principle of the lens meter by simulation by creating a true model of the lens LE as described above. For example, the second refractive power may be spherical refractive power, cylindrical refractive power, cylinder axis angle, etc. In addition, for example, the second refractive power may further be an equivalent spherical refractive power based on the spherical refractive power and the cylindrical refractive power. In addition, for example, the second prism amount may be the prism amount in the X direction, the prism amount in the Y direction, etc.

[0111] The operator operates a switch (not shown) for starting a simulation of the second refractive power of the lens LE by operating the operation unit. The control unit 70 starts the simulation in response to an operation signal from the operation unit. For example, the control unit 70 executes a ray tracing process that takes into account the difference in the incident angle of the measurement light between the lens checker and the lens meter.

[0112] Fig. 10 is a diagram for explaining the angle of incidence of measurement light in a lens checker and a lens meter. Fig. 10(a) shows the lens checker. Fig. 10(b) shows the lens meter. Note that in Fig. 10(b), for convenience, the nosepiece 100 is moved relative to the lens LE, but in reality, the lens LE is moved relative to the nosepiece 100.

[0113] For example, the lens checker is configured so that when the measurement light beam irradiated widely on the lens LE is incident on the lens LE, the measurement light is incident at an angle of 90° with respect to the mounting surface PT for any measurement point on the lens LE. In other words, the measurement light is incident parallel to the measurement optical axis N. For this reason, the measurement light may not necessarily intersect perpendicularly with the tangent TL of the rear surface at the measurement point of the lens LE. As an example, the light ray R1 is incident at a predetermined angle θ3 from the vertical direction with respect to the tangent TL of the rear surface of the measurement point Q1.

[0114] For example, in the lens meter, by bringing the rear surface of the lens LE into contact with the nosepiece 100, the mounting surface PT at the measurement point of the lens LE and the tangent line TR of the rear surface at the measurement point of the lens LE become the same (almost the same). Therefore, for example, at any measurement point on the lens LE, the measurement light is incident at an angle of 90° to the mounting surface (i.e., parallel to the measurement optical axis M) and perpendicularly intersects with the tangent line TL of the rear surface at the measurement point of the lens LE. As an example, the light ray R1 is incident perpendicularly to the mounting surface PT and the tangent line TL of the rear surface at the measurement point Q1.

[0115] Therefore, for example, the control unit 70 performs a simulation in which the incident angle of the measurement light is changed so that the measurement light is incident perpendicularly to the tangent line of the rear surface of the partial true model β2 (or the entire true model) of the lens LE. In other words, a simulation is performed in which the incident angle of the measurement light is changed, assuming a state in which the lens LE is placed on the nosepiece 100.

[0116] For example, the control unit 70 executes a ray tracing process of a ray R1 that is incident perpendicularly to the tangent of the rear surface of the real model β2 and reaches the measurement point Q1. For example, more specifically, the control unit 70 uses the true second front surface shape K2A and the true second rear surface shape K2B of the real model β2, and the refractive index n, to simulate the second refractive power of the measurement point Q1, which is calculated by refracting the ray R1 that is incident perpendicularly to the tangent of the rear surface of the real model β2 by the true second front surface shape K2A and further by the true second rear surface shape K2B. For example, in this manner, the second refractive power based on the measurement principle of the lens meter is obtained. Note that, for example, the control unit 70 may also perform a simulation in which the angle of incidence of the measurement light is changed for points other than the measurement point Q1 in the same manner, and obtain the second refractive power for each measurement point. Also, for example, the control unit 70 may obtain the second prism amount based on the measurement principle of the lens meter by calculating the deviation angle of the ray R1 in the ray tracing process of the ray R1.

[0117] <Output of the first optical characteristic and the second optical characteristic (Step 5)> For example, when the control unit 70 acquires the first optical characteristic and the second optical characteristic of the lens LE, it causes them to be displayed on the monitor 4. For example, the first optical characteristic of the lens LE is an actual measurement value of a lens checker measured using the measurement optical system 20. Also, for example, the second optical characteristic of the lens LE is a simulation value (reference value) obtained by simulating a ray tracing process of the measurement light, assuming a measurement result by a lens meter.

[0118] 11 is an example of a display screen 110 in the case where the lens LE is a single focal length lens. For example, the display screen 110 displays a first optical characteristic 120 and a second optical characteristic 130 at an arbitrary measurement point (measurement point Q1 as an example) of the lens LE. Also, for example, the display screen 110 displays an outer shape 140 of the lens LE. For example, the outer shape 140 of the lens LE may be acquired and displayed by detecting a lens image (left lens image 60 as an example) from either the measurement image M1 or the measurement image M2. For example, an eye point position 150 of the eyeglass wearer, etc. may be superimposed on the outer shape 140 of the lens LE.

[0119] For example, the operator can easily obtain the simulation value when the measurement device 1 is configured as a lens checker but is configured as a lens meter by checking the display screen 110. Therefore, for example, the operator can refer to the simulation value when prescribing lenses for a spectacle wearer. Also, for example, the operator can easily grasp the presence or absence and the degree of difference between the first optical characteristic (actual measurement value) and the second optical characteristic (simulation value) by checking the display screen 110.

[0120] In this embodiment, even if the lens LE is a progressive power lens, steps 1 to 4 are performed in order, and in step 5, the first optical characteristic (i.e., the actual measurement value of the lens checker) and the second optical characteristic (i.e., the simulated value of the lens meter) are displayed on the monitor 4.

[0121] Fig. 12 is an example of a display screen 110 in the case where the lens LE is a progressive power lens. For example, a first map image 160 showing a first optical characteristic distribution at each measurement point, a second map image 170 showing a second optical characteristic distribution at each measurement point, etc. may be superimposed on the outer shape 140 of the lens LE together with the eye point position 150 of the eyeglass wearer. For example, the first map image 160 and the second map image 170 may be images showing at least one of the distributions of spherical refractive power, cylindrical refractive power, spherical equivalent power, cylinder axis angle, etc. For example, the first map image 160 and the second map image 170 in Fig. 12 are images showing the distribution of cylindrical refractive power.

[0122] For example, the operator can easily understand the characteristics of a progressive lens by comparing the first map image 160 and the second map image 170. For example, even if the distance portion, intermediate portion, near portion, etc. of the progressive lens are not shown in the first map image 160, if at least one of these is shown in the second map image 170, the operator can easily understand what kind of lens it is. As an example, by using the second map image 170, the operator can intuitively understand lenses for going out (bifocal lenses with a wide distance portion), lenses for desk work (bifocal lenses with a wide intermediate portion), lenses for close-up use (bifocal lenses with a wide near portion), etc.

[0123] For example, the actual measurement value of the lens LE by the lens checker and the actual measurement value of the lens meter are more likely to be different from each other at the peripheral position farther from the optical center position O than at the optical center position O. For example, this is because the light ray R1 incident on the lens LE is more inclined with respect to the tangent line TL of the rear surface of the lens LE at the peripheral position of the lens LE (that is, the predetermined angle θ3 is larger). In particular, such a problem is likely to occur in progressive lenses because the distance portion and the near portion are present at the peripheral position, and there is a possibility that the peripheral position cannot be measured with high accuracy when the measurement principle of the lens checker is used. However, by using the measurement device 1 as in this embodiment, the simulation value of the progressive lens can be appropriately obtained.

[0124] As described above, for example, the eyeglass lens measuring device of this embodiment projects a measurement light beam as a parallel light beam onto a wide area of ​​the eyeglass lens, and receives the measurement light beam that has passed through the eyeglass lens, thereby measuring the first optical characteristic of at least one measurement point where the measurement light, which is a part of the measurement light beam, is incident on the eyeglass lens at a first incidence angle, acquiring position information of the measurement point of the eyeglass lens, acquiring front surface shape information including at least the measurement point of the eyeglass lens, acquiring rear surface shape information including at least the measurement point of the eyeglass lens, and acquiring the second optical characteristic when the measurement light is incident at a second incidence angle different from the first incidence angle based on the first optical characteristic of the measurement point, the position information of the measurement point, the front surface shape information of the measurement point, and the rear surface shape information of the measurement point, and outputting at least the second optical characteristic. As a result, for example, the eyeglass lens measuring device irradiates the measurement light at a first incidence angle, but it is possible to reproduce various states in which the measurement light is irradiated at a second incidence angle, and simulate the refraction of the measurement light by the eyeglass lens. Therefore, it is possible to accurately acquire the second optical characteristic when the measurement light is irradiated at the second irradiation angle.

[0125] Also, for example, the spectacle lens measuring device of this embodiment acquires model shape information of the spectacle lens, which is constructed based on the front shape information and the rear shape information of the spectacle lens, and acquires the second optical characteristic based on the first optical characteristic of the measurement point, the position information of the measurement point, and such model shape information. For example, by constructing the model shape information of the spectacle lens, the positional relationship of each measurement point on the spectacle lens can be easily grasped. Therefore, for example, the second optical characteristic when the measurement light is incident on the spectacle lens at the second incident angle can be more easily acquired.

[0126] Also, for example, the spectacle lens measuring device of this embodiment acquires the refractive index of the spectacle lens, acquires provisional first front surface shape information based on the optical characteristics and refractive index of the optical center of the spectacle lens as the front surface shape information, acquires provisional first rear surface shape information based on the optical characteristics, refractive index, and first front surface shape information of the optical center of the spectacle lens as the rear surface shape information, and acquires the second optical characteristics of the measurement point based on the first optical characteristics of the measurement point, the position information of the measurement point, the provisional first front surface shape information of the measurement point, and the provisional first rear surface shape information of the measurement point. For example, the front surface shape and rear surface shape of the spectacle lens can be easily estimated by using the optical characteristics and refractive index of the optical center of the spectacle lens. As an example, it can be easily estimated by changing the curvature while keeping the focal length of the spectacle lens constant (so-called bending). Therefore, provisional model shape information of the spectacle lens can be easily constructed and the second optical characteristics at the measurement point can be acquired.

[0127] For example, the eyeglass lens measuring device of this embodiment acquires true second back surface shape information, which is assumed to measure the first optical characteristic at the measurement point, based on the first optical characteristic of the measurement point and the provisional first front surface shape information of the measurement point, as back surface shape information, and acquires the second optical characteristic of the measurement point based on the first optical characteristic of the measurement point, the position information of the measurement point, the provisional first front surface shape information of the measurement point, and the true second back surface shape information of the measurement point. For example, the provisional model shape information of the measurement point is replaced with the back surface shape information, and the back surface shape information is corrected to an appropriate back surface shape information such that the first optical characteristic is measured at the measurement point, thereby constructing a model that reproduces the actual shape of the eyeglass lens. Therefore, the second optical characteristic of the measurement point can be acquired more accurately.

[0128] Also, for example, the eyeglass lens measuring device of this embodiment measures the first optical characteristic at a plurality of measurement points, obtains front surface shape information and rear surface shape information for each measurement point, and obtains the second optical characteristic for each measurement point, thereby outputting the distribution of the second optical characteristic. For example, this allows the characteristics of the eyeglass lens to be visually confirmed. In particular, in the case of a progressive lens, etc., the distribution in all or part of the progressive lens is output, so that the size and arrangement of the distance portion, intermediate portion, near portion, etc. can be easily grasped.

[0129] Furthermore, for example, the eyeglass lens measurement device of this embodiment acquires the second optical characteristic of the measurement point by setting the angle at which the measurement light is perpendicular to the rear surface of the eyeglass lens as the second incident angle. In other words, the second optical characteristic of the measurement point is acquired assuming a state in which the eyeglass lens is placed on the nosepiece of the lens meter. As a result, for example, even though the eyeglass lens measurement device is a device that performs measurements based on the measurement principle of a lens checker, it is possible to reproduce the state measured using a lens meter and acquire the second optical characteristic of the eyeglass lens with high accuracy.

[0130] <Example of transformation> In this embodiment, the configuration for acquiring the first optical characteristic and the second optical characteristic of the lens LE framed in the eyeglasses has been described as an example, but the present invention is not limited thereto. For example, in this embodiment, the configuration for acquiring the first optical characteristic and the second optical characteristic of an uncut lens (in other words, a raw lens) that is not framed in the eyeglasses may be used. For example, in this case, the outer shape (lens image) of the uncut lens may be displayed on the display screen 110 of the monitor 4, and the eye point position 150, the first map image 160, the second map image 170, and the like may be superimposed on the outer shape of the uncut lens. Furthermore, for example, since the uncut lens may have a mark or a print mark, these may be detected and superimposed on the outer shape of the uncut lens.

[0131] In this embodiment, a configuration has been described in which the outer shape 140 of the lens LE is displayed by detecting a lens image (frame image) from either the measurement image M1 including the first index pattern image 41 or the measurement image M2 including the second index pattern image 51 on the display screen 110, but the present invention is not limited to this. For example, in this embodiment, a captured image may be acquired with the index 31 of the transmissive display 24 hidden, and a lens image (frame image) may be detected from the captured image not including the first index pattern image 41 and the second index pattern image 51, and displayed as the outer shape 140 of the lens LE. For example, when such a captured image is used, the lens image can be more easily detected than when the measurement image M1 or the measurement image M2 is used.

[0132] Furthermore, for example, the above-mentioned captured image may be acquired in a state where the eyeglass wearer wears the eyeglasses and the eye point position is marked in advance on the lens LE. For example, in this case, the eye point position 150 is detected together with the lens image, so that the eye point position 150 can be easily superimposed on the outer shape 140 of the lens LE.

[0133] In this embodiment, the optical center position O of the lens LE is calculated based on the positions of at least two points (measurement point Q1 and measurement point Q2) on the lens LE, but the present invention is not limited to this. For example, in this embodiment, the prism amount for each measurement point can be calculated as described above. Therefore, for example, the control unit 70 may compare the prism amount for each measurement point and set the position where the prism amount is minimum as the optical center position O. Note that if the refractive power of the lens LE is weak, it may be difficult to determine the position where the prism amount is minimum. For example, in this case, the control unit 70 may consider the geometric center position of the lens LE as the optical center position O.

[0134] In this embodiment, in the reconstruction of the true model β2 of the lens LE, the provisional first front surface shape K1A is used as the true second front surface shape K2A, and the true second rear surface shape K2B is calculated by ray tracing processing. However, the present invention is not limited to this. For example, the reconstruction of the true model β2 of the lens LE may be configured to use the provisional first rear surface shape K1B as the true second rear surface shape K2B, and to calculate the true second front surface shape K2A by ray tracing processing. For example, in this case, the true second front surface shape K2A can be obtained by performing ray tracing processing of the ray R1 so that the 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.

[0135] For example, in this way, the eyeglass lens measuring device of the present embodiment acquires true second front surface shape information, which is assumed to measure the first optical characteristic at the measurement point, based on the first optical characteristic of the measurement point and the provisional first back surface shape information of the measurement point, as the front surface shape information, and acquires the second optical characteristic of the measurement point based on the first optical characteristic of the measurement point, the position information of the measurement point, the true second front surface shape information of the measurement point, and the provisional first back surface shape information of the measurement point. For example, the provisional model shape information of the measurement point is replaced with the front surface shape information, and the front surface shape information is corrected to an appropriate front surface shape information such that the first optical characteristic is measured at the measurement point, thereby constructing a model that reproduces the actual shape of the lens LE. Therefore, the second optical characteristic of the measurement point can be acquired with higher accuracy.

[0136] In this embodiment, the second optical characteristic (simulation value) assuming the measurement result using the lens meter is acquired assuming the case where the light ray R1 is perpendicularly incident on the rear surface of the lens LE on the front side of the lens LE, but the present invention is not limited to this. For example, the second optical characteristic may be acquired assuming the case where the light ray R1 is perpendicularly incident on the rear surface of the lens LE on the rear side of the lens LE. For example, in this case, the measurement value when using a FOA (focus on axis) lens meter, which is a manual lens meter, can be acquired as the second optical characteristic.

[0137] In this embodiment, the second optical characteristic is acquired at the measurement point of the lens LE assuming the measurement result using the lens meter configuration, but the present invention is not limited to this. For example, the second optical characteristic may be acquired at the measurement point of the lens LE assuming the measurement result when the eyeglass wearer wears the eyeglasses.

[0138] FIG. 13 is a diagram showing a schematic diagram of a state in which a spectacle wearer wears spectacle (a spectacle wearing state). For example, a state in which a spectacle frame is supported by the support unit 10 can be considered as a spectacle wearing state of the spectacle wearer. For example, at this time, the measurement optical axis N of the measurement light irradiated to the lens LE and the optical axis W of the lens LE coincide (substantially coincide). For example, the optical axis W of the lens LE is an axis that is perpendicular to the lens surface of the lens LE and passes through the optical center position O. For example, when the spectacle wearer looks in the front direction, the visual axis I of the spectacle wearer coincides (substantially coincides) with the measurement optical axis N of the measurement light and the optical axis W of the lens LE. On the other hand, for example, when the spectacle wearer looks in the lateral direction (either left, right, up, or down), the visual axis I is shifted from the measurement optical axis N of the measurement light and the optical axis W of the lens LE. As an example, when the spectacle wearer looks to the right, the visual axis I passes through the measurement point Q1, not the optical center position O on the lens LE.

[0139] For example, a light ray R1 from the measurement optical system 20 is incident on a measurement point Q1 on the lens LE from a vertical direction, but the visual axis I is tilted by a predetermined angle θ4 with respect to the light ray R1. Therefore, for example, the control 70 may use the true second front surface shape K2A and the true second rear surface shape K2B of the true model β2, and the refractive index n, to simulate the second refractive power of the measurement point Q1, which is calculated by refracting the light ray R1 incident on the measurement point Q1 of the true model β2 at a predetermined angle θ4 by the true second front surface shape K2A and further by the true second rear surface shape K2B.

[0140] For example, the eyeglass lens measuring device of this embodiment acquires the second optical characteristic of the measurement point by setting the angle at which the measurement light forms the visual axis in the eyeglass wearing state as the second incident angle. In other words, the second optical characteristic of the measurement point is acquired assuming a state in which the eyeglass wearer wears the eyeglasses. As a result, for example, even though the eyeglass lens measuring device is a device that performs measurement based on the measurement principle of a lens checker, it is possible to acquire the second optical characteristic in the eyeglass wearing state with high accuracy.

[0141] In this embodiment, the warp angle or forward tilt angle of the eyeglass frame may be reflected in the reconstruction of the true model β2 of the lens LE. For example, if the eyeglass frame has a warp angle or forward tilt angle, the lens LE will be inclined with respect to the placement surface PT when the eyeglass frame is supported by the support unit 10. Therefore, for example, the inclinations in the X and Y directions of the measurement point Q1 in the true model β2 may be changed based on the warp angle or forward tilt angle. As an example, the first-order differential coefficients I3 to I4 of the measurement point Q1 may be changed based on the warp angle or forward tilt angle.

[0142] When the warp angle or forward tilt angle of the eyeglass frame is taken into consideration, the operator may operate the operation unit to input at least one of the warp angle and the forward tilt angle. For example, a value measured in advance may be input using a jig for measuring the warp angle or the forward tilt angle of the eyeglass frame. Also, for example, the warp angle or the forward tilt angle of the eyeglass frame may be stored in the memory 75 in advance as a fixed value (for example, 5 degrees).

[0143] In this embodiment, the first and second refractive powers of the lens LE are calculated based on the placement surface PT of the lens LE, but the present invention is not limited to this. For example, the first and second refractive powers of the lens LE may be calculated based on the position coordinates of the rear surface of the measurement point of the lens LE. For example, in this case, the control unit 70 may correct the first and second refractive powers to values ​​based on the position coordinates of the rear surface of the measurement point Q1 in the tentative first rear surface shape K1B by using the distance from the measurement point Q1 to the placement surface PT. [Explanation of symbols]

[0144] 1 Eyeglass lens measuring device 10 Support Unit 20 Measurement optical system 21 Light source 24 Transmissive Display 27 Image sensor 70 Control section 75 Memory

Claims

1. An eyeglass lens measuring device for measuring optical characteristics of an eyeglass lens, a measuring means for projecting a measurement light beam as a parallel light beam onto a wide area of ​​the eyeglass lens and receiving the measurement light beam that has passed through the eyeglass lens, thereby measuring a first optical characteristic of at least one measurement point at which measurement light, which is a part of the measurement light beam, is incident on the eyeglass lens at a first incident angle; a position information acquisition means for acquiring position information of the measurement point on the eyeglass lens; a front surface shape information acquiring means for acquiring front surface shape information of the eyeglass lens, the front surface shape information including at least the measurement points; a rear surface shape information acquisition means for acquiring rear surface shape information of the eyeglass lens, the rear surface shape information including at least the measurement points; a calculation means for acquiring a second optical characteristic when the measurement light is incident at a second incident angle different from the first incident angle, based on the first optical characteristic of the measurement point, the position information, the front surface shape information, and the rear surface shape information; an output unit that outputs at least the second optical characteristic; An eyeglass lens measurement device comprising:

2. 2. The eyeglass lens measuring device according to claim 1, the calculation means acquires model shape information of the eyeglass lens, the model shape information being constructed based on the front surface shape information and the rear surface shape information; An eyeglass lens measurement device, characterized in that the second optical characteristic is acquired based on the first optical characteristic of the measurement point, the position information, and the model shape information.

3. 2. The eyeglass lens measuring device according to claim 1, a refractive index acquisition means for acquiring the refractive index of the eyeglass lens; the front surface shape information acquisition means acquires, as the front surface shape information, tentative first front surface shape information based on optical characteristics of the optical center of the eyeglass lens and the refractive index; the rear surface shape information acquisition means acquires, as the rear surface shape information, tentative first rear surface shape information based on optical characteristics of the optical center of the eyeglass lens, the refractive index, and the tentative first front surface shape information; The spectacle lens measurement device is characterized in that the calculation means acquires the second optical characteristic based on the first optical characteristic, the position information, the tentative first front surface shape information, and the tentative first rear surface shape information.

4. In the eyeglass lens measurement device according to any one of claims 1 to 3, the measuring means measures the first optical characteristic at a plurality of the measurement points; the front surface shape information acquisition means acquires the front surface shape information for each of the measurement points, the rear surface shape information acquisition means acquires the rear surface shape information for each of the measurement points, the calculation means acquires the second optical characteristic for each of the measurement points, The spectacle lens measuring device is characterized in that the output means outputs the distribution of the second optical characteristic.

5. A spectacle lens measurement program used in a spectacle lens measurement device that measures optical characteristics of a spectacle lens, When executed by the processor of the eyeglass lens measurement device, a measuring step of projecting a measurement light beam as a parallel light beam onto a wide area of ​​the eyeglass lens and receiving the measurement light beam that has passed through the eyeglass lens, thereby measuring a first optical characteristic of at least one measurement point where measurement light, which is a part of the measurement light beam, is incident on the eyeglass lens at a first incident angle; a position information acquisition step of acquiring position information of the measurement point on the eyeglass lens; a front surface shape information acquisition step of acquiring front surface shape information of the eyeglass lens, the front surface shape information including at least the measurement points; a back surface shape information acquisition step of acquiring back surface shape information of the eyeglass lens, the back surface shape information including at least the measurement points; a calculation step of acquiring second optical characteristics when the measurement light is incident at a second incident angle different from the first incident angle, based on the first optical characteristics of the measurement point, the position information, the front surface shape information, and the rear surface shape information; an output step of outputting at least the second optical characteristic; A spectacle lens measuring program that causes the spectacle lens measuring device to execute the above.

6. An eyeglass lens measuring device for measuring optical characteristics of an eyeglass lens, a measuring means for projecting a measurement light beam as a parallel light beam onto a wide area of ​​the eyeglass lens and receiving the measurement light beam that has passed through the eyeglass lens, thereby measuring first optical characteristics at at least a first measurement point at the optical center of the eyeglass lens and a second measurement point different from the first measurement point, the measurement light being a part of the measurement light beam and incident on the eyeglass lens at a first incident angle; a calculation means for projecting the measurement light beam onto the spectacle lens based on the first optical characteristics of the first measurement point and the second measurement point and position information of the second measurement point, and acquiring a second optical characteristic at the second measurement point when the measurement light beam is incident on the second measurement point at a second incident angle perpendicular to the rear surface of the spectacle lens; an output unit that outputs at least the second optical characteristic; An eyeglass lens measurement device comprising:

Images