Spectacle lens measurement device and spectacle lens measurement program

Abstract

To provide a spectacle lens measurement device capable of appropriately acquiring an optical characteristic of a spectacle lens.SOLUTION: A spectacle lens measurement device for measuring a spectacle lens includes a light source for irradiating a spectacle lens with a measuring light flux, a transmission type display for transmitting the measuring light flux from the light source, the transmission type display being capable of displaying an index pattern formed by arranging a plurality of indexes, display control means for controlling display of the index pattern, a detector for detecting the measuring light flux via the spectacle lens and the transmission type display, position information acquisition means for acquiring position information showing a passage position at which the measuring light flux from the light source passes through the transmission type display on the basis of a detection result by the detector, and inclination calculation means for acquiring inclination of the spectacle lens on the basis of a plurality of measuring light fluxes having different passage positions based on the position of the transmission type display.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to an eyeglass lens measurement device and an eyeglass lens measurement program that measure optical characteristics of an eyeglass lens. [Background technology]

[0002] Lens meters that can acquire the optical characteristics of eyeglass lenses are known as information about eyeglass lenses. For example, a lens meter that reproduces and maintains the wearing state of an eyeglass frame and acquires the optical characteristics of eyeglass lenses fitted in the eyeglass frame has been disclosed (see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2012-93348 Summary of the Invention [Problem to be solved by the invention]

[0004] The lens meter of Patent Document 1 can acquire the refractive power of the eyeglass lenses fitted into the eyeglass frame by reproducing the state in which the eyeglass frame is worn. However, the refractive power of the eyeglass lenses changes due to the influence of the inclination of the eyeglass lenses fitted into the eyeglass frame (for example, the amount of prism such as the forward tilt angle or the bend angle), and so there are cases in which a value different from the refractive power of the eyeglass lenses originally fitted into the eyeglass frame is acquired.

[0005] In view of the above problems, the present disclosure has as its technical object to provide an eyeglass lens measurement device that can appropriately acquire the optical characteristics of an eyeglass lens. [Means for solving the problem]

[0006] In order to solve the above problems, the present disclosure is characterized by having the following configuration.

[0007] (1) A spectacle lens measurement device according to a first aspect of the present disclosure is a spectacle lens measurement device for measuring spectacle lenses, characterized by comprising: a light source that irradiates a measurement beam toward the spectacle lens; a transmissive display that transmits the measurement beam from the light source and is capable of displaying an index pattern formed by an arrangement of multiple indices; a display control means that controls the display of the index pattern; a detector that detects the measurement beam that has passed through the spectacle lens and the transmissive display; a position information acquisition means that acquires position information indicating a passing position where the measurement beam from the light source has passed through the transmissive display based on the detection result by the detector; and a tilt calculation means that acquires a tilt of the spectacle lens based on the multiple measurement beams that have different passing positions based on the position information of the transmissive display. (2) A spectacle lens measurement program according to a second aspect of the present disclosure is a spectacle lens measurement program executed by a spectacle lens measurement device that measures optical characteristics of a spectacle lens, the spectacle lens measurement device including a transmissive display that transmits a measurement light beam from a light source and is capable of displaying an index pattern formed by arranging a plurality of indices, and a detector that detects the measurement light beam that has passed through the spectacle lens and the transmissive display, the spectacle lens measurement program including a display control step of, when executed by a processor of the spectacle lens measurement device, displaying the index pattern on the transmissive display, and detecting the measurement light beam from the light source based on the detection result by the detector. and a tilt calculation step of calculating the tilt of the eyeglass lens based on a plurality of the measurement light beams having different passing positions based on the position information of the transmissive display, wherein the tilt calculation step calculates, based on the position information, a plurality of positions of bending points, which are intersections of the measurement light beam incident on the eyeglass lens and the measurement light beam bent by the eyeglass lens and incident on the detector, and obtains the tilt of the plane passing through the positions of the plurality of bending points, thereby obtaining the tilt of the eyeglass lens. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. [Figure 2] FIG. 2 is a schematic diagram of an eyeglass support unit and a lens measurement unit. [Figure 3] 1 is an example of an index pattern that can be displayed on a transmissive display. [Figure 4] 10 is an example of a captured image obtained by displaying a first index pattern on a first transmissive display. [Figure 5] 10 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] 1 is a schematic diagram showing a state in which the optical axis of a lens is tilted with respect to a measurement light beam emitted by a light source. [Figure 9] FIG. 2 is a schematic diagram illustrating obtaining the tilt of the eyeglass lens based on the bending point of each ray. [Figure 10] FIG. 10 is a schematic diagram showing a surface formed to pass through the positions of a plurality of bending points. DETAILED DESCRIPTION OF THE INVENTION

[0009] <Summary> The eyeglass lens measurement device of the present disclosure is a device for measuring eyeglass lenses. The eyeglass lens measurement device of the present disclosure may include a measurement optical system. The measurement optical system may include a configuration for measuring optical characteristics of the eyeglass lens. For example, the optical characteristics of the eyeglass lens may be at least one of spherical power, cylindrical power, astigmatism axis angle, prism amount, etc. The measurement optical system may include at least a light source, a transmissive display, and a detector. For example, the optical characteristics of the eyeglass lens may be measured by projecting a measurement beam from the light source toward the eyeglass lens and detecting the measurement beam that has passed through the eyeglass lens and the transmissive display with the detector. The measurement optical system may include a retroreflective member that reflects the measurement beam from the light source back in the incident direction and illuminates the eyeglass lens. The measurement optical system may also include an optical member for shaping the measurement beam from the light source. The measurement optical system may also include an optical path branching member for branching the measurement beam from the light source into multiple optical paths.

[0010] The eyeglass lens measurement device of the present disclosure includes a light source. The light source irradiates a measurement light beam toward the eyeglass lens. The light source may be disposed at any position. The light source may be a point light source. In this case, for example, an LED (Light Emitting Diode) or the like may be used as the point light source. The light source may also be a surface light source. In this case, for example, a light-emitting panel or the like may be used as the surface light source.

[0011] The light source may include a first light source and a second light source. For example, the first light source may be a left lens light source that irradiates a measurement light beam toward the left lens of the eyeglass lenses. Also, for example, the second light source may be a right lens light source that irradiates a measurement light beam toward the right lens of the eyeglass lenses.

[0012] The first light source and the second light source may be the same. That is, the first light source (second light source) may irradiate the measurement light beam toward the left lens of the eyeglass lens and the right lens of the eyeglass lens. For example, the first light source (second light source) may irradiate the measurement light beam toward the left lens and the right lens in that order. In this case, a change unit (e.g., a motor) may be provided to change the relative positional relationship between the first light source (second light source) and the eyeglass lens. Also, for example, the first light source (second light source) may irradiate the measurement light beam toward both the left lens and the right lens. As an example, the left lens and the right lens may be both disposed in the optical path along which the measurement light beam from the first light source (second light source) is irradiated, thereby irradiating the measurement light beam toward both the left lens and the right lens. This allows the optical characteristics of the left lens and the right lens to be acquired simultaneously. This also allows lens information of the left lens and the right lens to be acquired simultaneously.

[0013] The first light source and the second light source may be provided as a pair on the left and right sides. That is, the first light source may irradiate a measurement light beam toward the left lens of the eyeglass lens, and the second light source may irradiate a measurement light beam toward the right lens of the eyeglass lens. In this case, at least a part of the first optical path along which the measurement light beam is guided from the first light source toward the left lens and the second optical path along which the measurement light beam is guided from the second light source toward the right lens may be a common optical path. In this case, the first optical path along which the measurement light beam is guided from the first light source toward the left lens and the second optical path along which the measurement light beam is guided from the second light source toward the right lens may be different optical paths.

[0014] For example, the first light source and the second light source may be turned on at different times to sequentially irradiate the left lens and the right lens with the measurement light beam. Alternatively, for example, the first light source and the second light source may be turned on at the same (or substantially the same) time to irradiate both the left lens and the right lens with the measurement light beam. That is, the left lens and the right lens may be irradiated with the measurement light beam simultaneously (or substantially simultaneously).

[0015] The eyeglass lens measurement device in this embodiment is equipped with a transmissive display. The transmissive display transmits the measurement light beam from the light source. The transmissive display is also capable of displaying an index pattern formed by arranging multiple indices.

[0016] In a transmissive display, an index pattern formed by arranging multiple indices is used to acquire at least one of the optical characteristics of a spectacle lens and the tilt of the spectacle lens. The multiple indices are formed in any shape, any position, any number, any different colors, etc., thereby expressing the index pattern. As an example, the multiple indices may have at least one shape such as dots (e.g., circular dots, square dots, etc.), lines (e.g., solid lines, dotted lines, dashed lines, etc.), etc. Also, as another example, the multiple indices may be arranged in at least one of a grid pattern, a radial pattern, a concentric circle pattern, etc.

[0017] The eyeglass lens measurement device in this embodiment includes a detector. The detector detects a measurement light beam that has passed through the eyeglass lens and the transmissive display. For example, the detector may detect a plurality of measurement light beams that have passed through different positions after passing through the eyeglass lens and the transmissive display. For example, the detector may detect a measurement light beam that has passed through the eyeglass lens and the first transmissive display, and a measurement light beam that has passed through the eyeglass lens and the second transmissive display. Furthermore, for example, the detector may detect a reflected light beam that has been emitted from a light source and reflected by a retroreflective member (described later).

[0018] The detector may be disposed at any position on the eyeglass lens. The detector may detect the measurement light beam based on a signal (signal data). The detector may also detect the measurement light beam based on an image (image data) obtained by converting the signal (signal data).

[0019] The detector may include a first detector and a second detector. For example, the first detector may be a left lens detector that detects the measurement light beam that has passed through the left lens of the eyeglass lenses and the transmissive display. For example, the second detector may be a right lens detector that detects the measurement light beam that has passed through the right lens of the eyeglass lenses and the transmissive display.

[0020] The first detector and the second detector may be shared. That is, the first detector (second detector) may detect a measurement light beam that has passed through the left lens of the eyeglass lens and the transmissive display, and a measurement light beam that has passed through the right lens of the eyeglass lens and the transmissive display. For example, the first detector (second detector) may sequentially detect a measurement light beam that has passed through the left lens and the transmissive display, and a measurement light beam that has passed through the right lens and the transmissive display. In this case, a change unit (e.g., a motor) that changes the relative positional relationship between the first detector (second detector) and the eyeglass lens may be provided. Also, for example, the first detector (second detector) may detect both a measurement light beam that has passed through the left lens and the transmissive display, and a measurement light beam that has passed through the right lens and the transmissive display. This makes it possible to simultaneously acquire at least one of the optical characteristics of the eyeglass lens and the tilt of the eyeglass lens for the left lens and the right lens.

[0021] The first detector and the second detector may be provided as a pair on the left and right sides. That is, the first detector may detect the measurement light beam that has passed through the left lens of the eyeglass lens and the transmissive display, and the second detector may detect the measurement light beam that has passed through the right lens of the eyeglass lens and the transmissive display. For example, the first detector and the second detector may sequentially detect the measurement light beam that has passed through the left lens and the transmissive display and the measurement light beam that has passed through the right lens and the transmissive display. Furthermore, for example, the first detector and the second detector may detect both the measurement light beam that has passed through the left lens and the transmissive display and the measurement light beam that has passed through the right lens and the transmissive display. That is, the measurement light beam that has passed through the left lens and the transmissive display and the measurement light beam that has passed through the right lens and the transmissive display may be detected simultaneously.

[0022] In addition, when a pair of first and second detectors is provided on the left and right sides, the number of pixels of the detectors can be effectively used for each of the left and right lenses of the eyeglass lens, and the position of the index pattern image (index image) can be detected more accurately, thereby improving the measurement accuracy of the optical characteristics. Furthermore, since it is not necessary to distinguish between the measurement light beam that has passed through the left lens and the transmissive display and the measurement light beam that has passed through the right lens and the transmissive display, at least one of the optical characteristics of the eyeglass lens and the tilt of the eyeglass lens can be obtained with simpler control.

[0023] The eyeglass lens measurement device in this embodiment includes a position information acquisition unit. The position information acquisition unit acquires position information indicating the position where the measurement light beam from the light source passes through the transmissive display based on the detection result by the detector. For example, by displaying an index pattern on the transmissive display, position information of the position where the measurement light beam from the light source passes through at least two points in the optical axis direction is acquired, and at least one of the optical characteristics of the eyeglass lens and the tilt of the eyeglass lens is acquired based on this. As an example, at least one of the optical characteristics of the eyeglass lens and the tilt of the eyeglass lens may be acquired using position information indicating the position where the measurement light beam from the light source passes through the eyeglass lens and position information indicating the position where the measurement light beam from the light source passes through the transmissive display. More specifically, at least one of the optical characteristics of the left lens and the tilt of the eyeglass lens may be acquired using position information indicating the position where the measurement light beam from the light source passes through the left lens of the eyeglass lens and position information indicating the position where the measurement light beam from the light source passes through the first transmissive display. In addition, at least one of the optical characteristics of the right lens and the tilt of the eyeglass lens may be obtained by using position information indicating the passing position of the measurement light beam from the light source through the right lens of the eyeglass lens and position information indicating the passing position of the measurement light beam from the light source through the second transmissive display.

[0024] As another example, at least one of the optical characteristics of the eyeglass lenses and the tilt of the eyeglass lenses may be acquired by using only position information indicating the position where the measurement light beam from the light source passed through the transmissive display. More specifically, at least one of the optical characteristics of the left lens and the tilt of the eyeglass lenses may be acquired by using only position information indicating the position where the measurement light beam from the light source passed through the first transmissive display. Alternatively, at least one of the optical characteristics of the right lens and the tilt of the eyeglass lenses may be acquired by using only position information indicating the position where the measurement light beam from the light source passed through the second transmissive display. In such a case, a change unit may be provided to change the relative positional relationship between the first transmissive display and the left lens. In such a case, a change unit may be provided to change the relative positional relationship between the second transmissive display and the right lens.

[0025] In addition, when acquiring at least one of the optical characteristics of the eyeglass lens and the tilt of the eyeglass lens, position information indicating the passing position of the measurement light beam from the light source through the transmissive display may be acquired by using an index pattern. Therefore, it is preferable that the multiple indexes are displayed so that the position information of the passing position of the measurement light beam from the light source through the transmissive display can be grasped.

[0026] The eyeglass lens measurement device in this embodiment includes a tilt calculation means. The tilt calculation means calculates, based on position information, multiple positions of bending points, which are intersections between the measurement light beam of the measurement light beam incident on the eyeglass lens and the measurement light beam of the measurement light beam refracted by the eyeglass lens and incident on the detector, and obtains the tilt of the plane passing through the multiple bending points, thereby obtaining the tilt of the eyeglass lens. More specifically, for example, a predetermined measurement light beam irradiated on the eyeglass lens forms a straight line connecting a point on a first index pattern displayed on the first transmissive display and a point on a second index pattern displayed on the second transmissive display. The tilt calculation means also calculates multiple bending points, which are intersections between the direction of the formed straight line toward the rear surface of the eyeglass lens and the straight line of the measurement light beam of the predetermined measurement light beam irradiated on the eyeglass lens on the front side of the eyeglass lens. The tilt of the eyeglass lens is obtained by calculating the plane passing through the multiple bending points and obtaining the tilt of the calculated plane.

[0027] The inclination of the eyeglass lens may be the angle of placement of the eyeglass lens placed between the light source and the detector with respect to the optical axis direction, or may be the forward tilt angle (vertical tilt) or curvature angle (horizontal tilt) of the eyeglass lens fitted in the eyeglass frame.

[0028] For example, depending on the shape of the eyeglass frame, the eyeglass lens may not be positioned parallel to the wearer's eyes. Therefore, the refractive power of the eyeglass lens may change due to the influence of the inclination of the eyeglass lens fitted into the eyeglass frame (e.g., prism amount such as forward tilt angle, curvature angle, etc.), resulting in a value different from the refractive power of the eyeglass lens fitted into the original eyeglass frame. Therefore, by acquiring the optical characteristics of the eyeglass lens taking into account the inclination of the eyeglass lens (e.g., forward tilt angle, curvature angle, etc.), the optical characteristics of the eyeglass lens can be appropriately acquired regardless of the shape of the eyeglass frame. The eyeglass lens measurement device disclosed herein calculates multiple positions of inflection points on the eyeglass lens based on position information indicating the passing position of the measurement light beam through the transmissive display, and can appropriately calculate the inclination of the eyeglass lens based on the calculated positions of the multiple inflection points. Therefore, compared to acquiring the inclination of the eyeglass lens using multiple cameras or interferometers, the inclination of the eyeglass lens can be appropriately calculated without complicating the device configuration.

[0029] The tilt of the eyeglass lens calculated in the present disclosure indicates the direction and magnitude of the angle of the optical axis of the eyeglass lens relative to the angle of the measurement light beam irradiated onto the eyeglass lens.

[0030] The transmissive display in this embodiment may have a first transmissive display capable of displaying a first index pattern and a second transmissive display capable of displaying a second index pattern. That is, the transmissive display capable of displaying the first index pattern may project a first index pattern image onto the left lens of the eyeglass lens, and the transmissive display capable of displaying the second index pattern may project a second index pattern image onto the left lens of the eyeglass lens. The transmissive display capable of displaying the first index pattern and the transmissive display capable of displaying the second index pattern may be disposed at different positions in the optical axis direction. Note that the first index pattern and the second index pattern may be the same index pattern. Of course, the first index pattern and the second index pattern may be index patterns that are at least partially different.

[0031] The second transmissive display may include a transmissive display capable of displaying the first index pattern and a transmissive display capable of displaying the second index pattern. That is, the transmissive display capable of displaying the first index pattern may project a first index pattern image onto the right lens of the eyeglass lens, and the transmissive display capable of displaying the second index pattern may project a second index pattern image onto the right lens of the eyeglass lens. The transmissive display capable of displaying the first index pattern and the transmissive display capable of displaying the second index pattern may be disposed at different positions in the optical axis direction. Note that the first index pattern and the second index pattern may be the same index pattern. Of course, the first index pattern and the second index pattern may be index patterns that are at least partially different.

[0032] In this way, by providing multiple transmissive displays at different positions in the optical axis direction, position information on the passing positions where the measurement light beam from the light source passes through at least two points in the optical axis direction can be obtained, regardless of the position in the optical axis direction where the measurement light beam from the light source passes through the eyeglass lens. Therefore, the tilt of the eyeglass lens can be obtained with high accuracy with a simple configuration without providing a means for changing the relative positional relationship between the eyeglass lens and the transmissive displays.

[0033] However, the eyeglass lens measurement device may move one transmissive display to multiple positions that are different from each other in the optical axis direction. Even in this case, regardless of the position in the optical axis direction where the measurement light beam from the light source passes through the eyeglass lens, position information of the passing position where the measurement light beam from the light source passes through at least two points in the optical axis direction can be obtained.

[0034] The tilt calculation means may obtain the tilt of the surface passing through the multiple bending points by excluding a predetermined region where the refraction of the measurement light beam is equal to or less than a threshold. The predetermined region may be set based on whether the refractive power exceeds a predetermined allowable range. Alternatively, the predetermined region may be set in advance based on the results of experiments or simulations. For example, in a region where the refraction of the measurement light beam is small, it is difficult to accurately obtain the position of the bending point when forming a tilt surface by connecting multiple points based on the index pattern, which may result in an error. Therefore, by excluding the region where the refraction of the measurement light beam is small, it is possible to accurately form a surface passing through the positions of the multiple bending points, and to accurately obtain the tilt of the eyeglass lens.

[0035] The method for setting the predetermined area where the refraction of the measurement light beam is equal to or less than a threshold value can be selected appropriately. For example, the predetermined area may be set to an area where the refraction angle of the two measurement light beams obtained from the position information is equal to or less than a threshold value. Furthermore, even when the predetermined area where the refraction angle of the measurement light beam is expected to be equal to or less than a threshold value is set to an exclusion area, the calculation accuracy of the inclination of the eyeglass lens is appropriately improved.

[0036] The tilt calculation means may output an alert when the calculation results of the tilt of the eyeglass lenses fitted in the eyeglass frame differ between the left and right eyeglass lenses. For example, the tilt of eyeglass lenses fitted in the eyeglass frame is often symmetrical. Therefore, by outputting an alert when the tilts of the left and right eyeglass lenses differ, it becomes easier to grasp measurement abnormalities, etc., and the tilt of the eyeglass lenses can be obtained with high accuracy. Of course, a tolerance range may be set for the error in the calculation results of the tilt of the left and right eyeglass lenses.

[0037] The eyeglass lens measurement device may further include a correction means for correcting a deviation of the measurement light beam that has passed through the eyeglass lens, which is caused by a tilt of the optical axis of the eyeglass lens relative to the measurement light beam that is irradiated toward the eyeglass lens. The tilt calculation means may calculate the position of the bending point based on the measurement light beam corrected by the correction means. When the optical axis of the eyeglass lens is tilted relative to the measurement light beam that is irradiated toward the eyeglass lens, a deviation occurs in the measurement light beam that passes through the eyeglass lens compared to when no tilt occurs. Therefore, the eyeglass lens measurement device can calculate the position of the bending point with higher accuracy by correcting the deviation of the measurement light beam that is caused by the tilt of the eyeglass lens and then calculating the position of the bending point. As a result, the accuracy of calculating the tilt of the eyeglass lens is likely to be further improved.

[0038] <Example> An example of an eyeglass lens measuring device (hereinafter, measuring device) according to 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 (vertical direction) as the Y direction, and the front-rear direction as the Z direction.

[0039] <Device configuration> 1 is an external view of a measurement device 1. For example, the measurement device 1 includes a housing 2, a storage section 3, a monitor 4, and the like.

[0040] The housing 2 has a storage section 3 therein. The storage section 3 stores the eyeglass support unit 10 (described later), a lens measurement unit (described later), etc. The monitor 4 displays various information (e.g., the optical characteristics of the lens LE, the tilt of the lens LE, the distribution of the optical characteristics of the lens LE, the image of a hidden mark on the lens LE, etc.). The monitor 4 is a touch panel. That is, the monitor 4 also functions as an operation section, and is used when the operator makes various settings (e.g., changing the interval between indicators, starting measurement, switching modes, etc.). A signal corresponding to an operation instruction input from the monitor 4 by the operator is output to the control section 70 (described later).

[0041] <Support unit> 2 is a schematic diagram of the eyeglasses support unit 10 and the lens measurement unit. The eyeglasses support unit 10 is used to place eyeglasses F. For example, the eyeglasses support unit 10 includes a positioning pin 11, a front support portion 12, a rear support portion 13, and the like.

[0042] The positioning pin 11 is brought into contact with the rear surface of the lens LE of the eyeglasses F. 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.

[0043] The front support portion 12 supports a portion in front of the center in the front-to-back direction when the eyeglasses F are worn (i.e., the direction in which the temples FT of the eyeglasses F extend). For example, the front support portion 12 supports the bridge FB of the eyeglasses F. The front support portion 12 is not limited to this embodiment and may support the rims of the eyeglasses F, for example. The rear support portion 13 supports a portion in back of the center in the front-to-back direction when the eyeglasses F are worn. For example, the rear support portion 13 supports the temples FT of the eyeglasses F. The rear support portion 13 is not limited to this embodiment and may support the ear tips FM of the eyeglasses F, for example. For example, in this embodiment, the eyeglasses F are placed on the front support portion 12 and the rear support portion 13 with the upper ends of the rims of the eyeglasses F facing upward and the lower ends of the rims of the eyeglasses F facing downward.

[0044] The front support part 12 and the rear support part 13 may be arranged to be movable on the base 5. For example, the front support part 12 may be arranged to be movable in the vertical direction (Y direction) by a drive mechanism not shown. Also, for example, the rear support part 13 may be arranged to be movable in the vertical direction (Y direction) by a drive mechanism not shown. For example, by moving at least one of the front support part 12 and the rear support part 13 in the vertical direction, it is possible to adjust the forward tilt angle of the eyeglasses F when the eyeglasses F are worn. Also, for example, by moving at least one of the front support part 12 and the rear support part 13 in the vertical direction, it is possible to make the rear surface of the lens LE of the eyeglasses F parallel (approximately parallel) to the bottom surface of the positioning pin 11.

[0045] <Lens measurement unit> The lens measuring unit is used to measure the optical characteristics of the lenses LE framed in the spectacles F. For example, the lens measuring unit includes a measurement optical system 20.

[0046] The measurement optical system 20 includes a light source 21, a half mirror 22, a collimator lens 23, a transmissive display 24, a retroreflecting member 25, an image pickup element 27, and the like.

[0047] The light source 21 irradiates a measurement light beam toward the lens LE of the eyeglasses F. In this embodiment, the light source 21 is configured to use a pair of left and right light sources (a first light source 21a and a second light source 21b). Note that the light source 21 may be configured to serve both as a light source for irradiating the measurement light beam toward the left lens LEl of the eyeglasses F and as a light source for irradiating the measurement light beam toward the right lens LEr of the eyeglasses F.

[0048] The collimator lens 23 shapes the measurement light beam from the light source 21 to be parallel (approximately parallel) to the optical axis N1 and the optical axis N1'. In this embodiment, the collimator lens 23 is configured such that collimator lenses (collimator lens 23a and collimator lens 23b) are arranged on the left and right optical paths, respectively. The measurement light beam from the first light source 21a is shaped to be parallel (approximately parallel) to the optical axis N1 by passing through the vicinity of the center of the collimator lens 23a. The measurement light beam from the second light source 21b is shaped to be parallel (approximately parallel) to the optical axis N1 by passing through the vicinity of the center of the collimator lens 23b.

[0049] In addition, like the light source 21, the collimator lens 23 may be configured to serve as both a collimator lens that shapes the measurement light beam to be parallel (approximately parallel) on the left lens LEl of the glasses F, and a collimator lens that shapes the measurement light beam to be parallel (approximately parallel) on the right lens LEr of the glasses F (for details, please refer to Patent Publication No. 2021-105572).

[0050] The transmissive display 24 is a highly transmittance display that can transmit the measurement light beam from the light source 21. The transmissive display 24 can display an index pattern 30, which will be described later. For example, by displaying the index pattern 30 on the transmissive display 24, the index pattern 30 is formed in the measurement light beam when the measurement light beam from the light source 21 passes through the transmissive display 24. Note that, for example, if the transmissive display 24 is hidden, the measurement light beam from the light source 21 passes through the transmissive display 24 without any display, and the index pattern 30 is not formed in the measurement light beam.

[0051] In this embodiment, a first transmissive display 24a and a second transmissive display 24b are provided as the transmissive display 24. The first transmissive display 24a and the second transmissive display 24b are arranged so that their respective vertical and horizontal centers coincide with the optical axis L1. The first transmissive display 24a and the second transmissive display 24b are arranged at a predetermined distance L12 in the direction of the optical axis N1.

[0052] The retroreflective member 25 reflects the measurement light beam from the light source 21 in the same (or substantially the same) direction as the incident direction, illuminating the lens LE of the eyeglasses F from the rear. The retroreflective member 25 may be rotated at high speed by a drive mechanism 26 (e.g., a motor, etc.). This makes it possible to uniformize reflection unevenness caused by variations in the distribution of small glass spheres (not shown), a reflective film (not shown), and other components of the retroreflective member 25.

[0053] The imaging element 27 captures an image of a reflected light beam that is a measurement light beam from the light source 21 reflected by the retroreflective member 25. In this embodiment, a pair of left and right imaging elements (a first imaging element 27a and a second imaging element 27b) are provided. The imaging element 27 is focused on the vicinity of the front surface of the lens LE of the eyeglasses F. Therefore, for example, a hidden mark or the like formed on the lens LE of the eyeglasses F is imaged in a nearly focused state.

[0054] For example, the measurement light beam from the first light source 21a passes through the half mirror 22a, is collimated by the collimator lens 23a, and reaches the left lens LEl of the eyeglasses F. Subsequently, as the measurement light beam passes through the left lens LEl, it is converged or diverged by the refractive power of the left lens LEl, passes through the transmissive display 24, and reaches the retroreflecting member 25. Furthermore, the measurement light beam is reflected by the retroreflecting member 25, passes again through the transmissive display 24, the left lens LEl, and the collimator lens 23a, is reflected by the half mirror 22a, and reaches the image sensor 27a. Also, for example, the measurement light beam from the second light source 21b passes through the half mirror 22b, is collimated by the collimator lens 23b, and reaches the right lens LEr of the eyeglasses F. Next, when the measurement light beam passes through the right lens LEr, it is converged or diverged by the refractive power of the right lens LEr, passes through the transmissive display 24, and reaches the retroreflecting member 25. The measurement light beam is further reflected by the retroreflecting member 25, passes through the transmissive display 24, the right lens LEr, and the collimator lens 23b again, is reflected by the half mirror 22b, and reaches the image sensor 27b. The image sensor 27a and the image sensor 27b capture images of the measurement light beam that has passed through each member.

[0055] The imaging element 27 may be configured to serve both as an imaging element for detecting the measurement light beam irradiated onto the left lens LEl of the glasses F and as an imaging element for detecting the measurement light beam irradiated onto the right lens LEr of the glasses F. The measurement optical system 20 is not limited to this configuration, and various configurations can be used.

[0056] <Indicator Pattern> 3 shows an example of an index pattern 30 that can be displayed on the transmissive display 24. Here, a first index pattern 30a that can be displayed on the first transmissive display 24a is taken as an example. Note that a second index pattern 30b that can be displayed on the second transmissive display 24b has the same configuration as described below, and therefore its description is omitted.

[0057] The first transmissive display 24a is capable of displaying an index 31 on the screen. The index 31 is made up of a peripheral index 31a and a reference index 31b.

[0058] For example, the peripheral indices 31a are provided in advance around the reference indices 31b in a predetermined shape, predetermined position, predetermined number, etc. In this embodiment, the peripheral indices 31a are formed in a circular shape. In this embodiment, the peripheral indices 31a are respectively arranged in a right region 33a on the side where the left lens LEl of the glasses F is arranged and in a left region 33b on the side where the right lens LEr of the glasses F is arranged. The peripheral indices 31a are respectively arranged in the right region 33a and the left region 33b so as to be symmetrical with respect to an axis in the vertical direction (Y direction) passing through the passing position I of the optical axis L1. In this embodiment, a large number of peripheral indices 31a are arranged.

[0059] For example, the reference indices 31b only need to be distinguishable from the peripheral indices 31a, and are provided in advance with a predetermined shape, predetermined position, predetermined number, etc. In this embodiment, the reference indices 31b are formed in a circular shape that is larger than the peripheral indices 31a. In addition, in this embodiment, the reference indices 31b are arranged in each of the right region 33a and the left region 33b so as to be symmetrical with respect to the vertical axis (Y direction) passing through the passing position I of the optical axis L1. In addition, in this embodiment, four reference indices 31b are arranged. For example, the reference indices 31b make it easier to identify the positional relationship between the respective peripheral indices 31a.

[0060] The first transmissive display 24a displays a plurality of indices 31 to represent a first index pattern 30a formed by the plurality of indices 31. As an example, as shown in FIG. 3(a), a first index pattern 30a can be represented in which the interval between the indices 31 is a distance S1. As another example, as shown in FIG. 3(b), a first index pattern 30a can be represented in which the interval between the indices 31 is a distance S2 that is shorter than the distance S1. As another example, as shown in FIG. 3(c), a first index pattern 30a can be represented in which the interval between the indices 31 is a distance S3 that is longer than the distance S1. For example, the display and non-display of the plurality of indices 31 is controlled by a control unit 70, which will be described later.

[0061] The first transmissive display 24a may arrange one index 31 at equal intervals as a display unit (segment), and express the first index pattern 30a formed by the multiple indexes 31 by applying or not applying a voltage to each segment. In other words, the first transmissive display 24a may express the first index pattern 30a formed by the multiple indexes 31 by segment display. For example, when a voltage is applied to a segment, the index 31 is displayed. For example, when no voltage is applied to a segment or when the application of voltage to the segment is stopped, the index 31 is hidden. For example, each index 31 may be formed by printing.

[0062] For example, if a voltage is applied to all segments provided on the first transmissive display 24a, the indicators 31 are displayed in all segments. In this case, a first indicator pattern 30a can be displayed in which the intervals between the indicators 31 are a predetermined distance (i.e., the shortest distance that can be displayed by the indicators 31). Furthermore, if a voltage is applied to specific segments provided on the first transmissive display 24a, the indicators 31 are displayed only in the specific segments. In this case, as an example, a first indicator pattern 30a can be displayed in which the intervals between the indicators 31 are longer than the shortest distance described above by applying a voltage to every other segment. Of course, a first indicator pattern 30a in which the intervals between the indicators 31 are longer can also be displayed by applying a voltage to every third, third, fourth, or other segment.

[0063] 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 are configured to have the same pattern. That is, the shapes of the indices 31 in the first index pattern 30a and the shapes of the indices 31 in the second index pattern 30b are configured to be the same. Furthermore, the positions of the indices 31 in the first index pattern 30a and the positions of the indices 31 in the second index pattern 30b are configured to be the same. Furthermore, the numbers of the indices 31 in the first index pattern 30a and the second index pattern 30b are configured to be the same.

[0064] <Indicator pattern image> Fig. 4 is an example of a captured image obtained by displaying the first index pattern 30a on the first transmissive display 24a. Fig. 4(a) shows a state in which the glasses F are not placed on the glasses support unit 10. Fig. 4(b) shows a state in which the glasses F are placed on the glasses support unit 10. Fig. 5 is an example of a captured image obtained by displaying the second index pattern 30b on the second transmissive display 24b. Fig. 5(a) shows a state in which the glasses F are not placed on the glasses support unit 10. Fig. 5(b) shows a state in which the glasses F are placed on the glasses support unit 10. For example, when the measurement light beam from the light source 21 is captured by the imaging element 27, the control unit 70 (described later) processes the electrical signal to obtain a captured image.

[0065] 4 and 5 show an example in which the lenses LE of the glasses F are minus lenses, and illustrate captured images of the right lens LEr of the glasses F. For convenience, the shapes of the first index pattern 30a and the second index pattern 30b are illustrated as different shapes in FIGS.

[0066] First, a reference state in which the glasses F are not placed on the glasses support unit 10 will be described. When the first index pattern 30a is displayed on the first transmissive display 24a in the reference state, the measurement light beam from the light source 21 is formed in the shape of the first index pattern 30a. Therefore, as shown in FIG. 4(a), a reference image B1 including an image of the first index pattern 30a (hereinafter, first index pattern image 41) is acquired as a captured image. Furthermore, when the second index pattern 30b is displayed on the second transmissive display 24b in the reference state, the measurement light beam from the light source 21 is formed in the shape of the second index pattern 30b. Therefore, as shown in FIG. 5(a), a reference image B2 including an image of the second index pattern 30b (hereinafter, second index pattern image 51) is acquired as a captured image.

[0067] In this embodiment, the positions and number of the indices 31 in the first index pattern 30a are the same as the positions and number of the indices 31 in the second index pattern 30b. Therefore, in the reference state, the pixel position of each index image in the reference image B1 is the same as the pixel position of each index image in the reference image B2. As an example, the pixel position of point P1 corresponding to the fourth index image from the left and the third index image from the top in the first index pattern image 41 is the same as the pixel position of point P2 corresponding to the fourth index image from the left and the third index image from the top in the second index pattern image 51.

[0068] Next, the measurement state in which the eyeglasses F are placed on the eyeglass support unit 10 will be described. When the first index pattern 30a is displayed on the first transmissive display 24a in the measurement state, the measurement light beam from the light source 21 is formed into the shape of the first index pattern 30a, and the measurement light beam from the light source 21 is refracted and converged by the refractive power of the lens LE. Therefore, as shown in FIG. 4(b), a measurement image M1 is acquired as the captured image. The measurement image M1 includes a first index pattern image 41, at least a portion of which is reduced to a circular shape compared to the reference state, and an image of the right lens LEr (hereinafter, referred to as a right lens image 60). When the second index pattern 30b is displayed on the second transmissive display 24b in the measurement state, the measurement light beam from the light source 21 is formed into the shape of the second index pattern 30b, and the measurement light beam from the light source 21 is refracted and converged by the refractive power of the lens LE. Therefore, as shown in Figure 5(b), the captured image is a measurement image M2 that includes a second index pattern image 51, at least a portion of which is circularly reduced from the reference state, and a right lens image 60.

[0069] In this embodiment, the transmissive displays are arranged so that the distance from the lens LE to the second transmissive display 24b is greater than the distance from the lens LE to the first transmissive display 24a. Therefore, in the measurement state, the second index pattern image 51 in the measurement image M2 appears smaller than the first index pattern image 41 in the measurement image M1, and the pixel position of each index image in the measurement image M1 differs from the pixel position of each index image in the measurement image M2. For example, the pixel position of point P1' corresponding to the fourth index image from the left and the third index image from the top in the first index pattern image 41 differs from the pixel position of point P2' corresponding to the fourth index image from the left and the third index image from the top in the second index pattern image 51.

[0070] For example, in the above description, the lens LE of the eyeglasses F is a minus lens. However, if the lens LE is a plus lens, the measurement light beam from the light source 21 will be refracted and diverged by the refractive power of the lens LE. Therefore, in the measurement state, the first index pattern image 41 and the second index pattern image 51 are acquired, at least a portion of which is enlarged to a circular shape compared to the reference state. The second index pattern image 51 in the measurement image M2 appears larger than the first index pattern image 41 in the measurement image M1. Furthermore, if the lens LE is an astigmatic lens, the first index pattern image 41 and the second index pattern image 51 are acquired, at least a portion of which is deformed to a more elliptical shape compared to the reference state. Furthermore, if the lens LE is a progressive lens, the first index pattern image 41 and the second index pattern image 51 are acquired, at least a portion of which is deformed to a more elliptical shape compared to the reference state.

[0071] <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 21, the drive mechanism 26, 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.

[0072] For example, the control unit 70 is realized by a general CPU (processor), RAM, ROM, etc. For example, the CPU controls the operation of each part in the measurement device 1. For example, the RAM temporarily stores various types of 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).

[0073] The memory 75 may be a non-transitory storage medium that can retain its contents even when the power supply is cut off. For example, a hard disk drive, a flash ROM, a USB memory, etc. can be used as the memory 75. For example, the memory 75 stores reference images B1 and B2 in the reference state, measurement images M1 and M2 in the measurement state, etc.

[0074] <Control action> The control operation of the measuring device 1 will be described.

[0075] <Preparing for measurement> The operator receives the eyeglasses F of the wearer and places the eyeglasses F on the eyeglass support unit 10. The operator also moves at least one of the front support part 12, the rear support part 13, and the positioning pin 11 to complete the alignment of the eyeglasses F with the measurement optical system 20.

[0076] The operator operates the monitor 4 to select a start button (not shown) for starting acquisition of the tilt of the eyeglass lenses of the eyeglasses F. The control unit 70 starts acquiring the tilt of the eyeglass lenses of the eyeglasses F in response to an input signal from the monitor 4. Note that, since the measurement procedures for the left lens LEl and the right lens LEr are similar, the procedure for measuring the left lens LEl will be described as an example in this embodiment.

[0077] <Acquisition of position information of measurement light beam in a transmissive display> First, to obtain the tilt of the eyeglass lens, position information indicating the passing positions of the measurement light beam from the light source through the transmissive display is obtained based on the detection results by the detector. In this embodiment, the position information of the passing positions of the measurement light beam from the light source through at least two points in the optical axis direction is obtained.

[0078] The operator operates the monitor 4 to select a measurement button to obtain the tilt of the left lens LE1. The control unit 70 displays the first transmissive display 24a and the second transmissive display 24b in response to an input signal from the monitor 4, and projects the first index pattern 30a and the second index pattern 30b onto the lens LE. In this embodiment, when the first transmissive display 24a is displayed, the second transmissive display 24b is hidden, and when the first transmissive display 24a is hidden, the second transmissive display 24b is displayed, and the first index pattern 30a and the second index pattern 30b are projected sequentially onto the lens LE, thereby obtaining positional information of the passing positions where the measurement light beam from the light source passes through two points in the optical axis direction.

[0079] The control unit 70 turns on the light source 21a. The control unit 70 also controls the first transmissive display 24a to display the predetermined first index pattern 30a. The second transmissive display 24b is kept in a non-display state, and the predetermined second index pattern 30b is not displayed. The measurement light beam from the light source 21a passes through the second transmissive display 24b and the first transmissive display 24a to be formed into the first index pattern 30a. The measurement light beam is then refracted by the left lens LEl and condensed by the condenser lens 23 to reach the image sensor 27. Based on the imaging result of the image sensor 27, the control unit 70 acquires a measurement image M1 including the first index pattern image 41 and the left lens image 60. The control unit 70 also controls the memory 75 to store the measurement image M1.

[0080] Next, the control unit 70 turns off the first transmissive display 24a and displays a predetermined second index pattern 30b on the second transmissive display 24b. The measurement light beam from the light source 21 passes through the second transmissive display 24b and is formed into the second index pattern 30b. After passing through the first transmissive display 24a, it is refracted by the left lens LEl and condensed by the condenser lens 23 to reach the image sensor 27. The control unit 70 acquires a measurement image M2 including a second index pattern image 51 and a left lens image 60 based on the imaging result of the image sensor 27. The control unit 70 also stores the measurement image M2 in the memory 75.

[0081] The control unit 70 detects where the index images in the reference image B1 in the reference state without the eyeglasses F have moved in the measurement image M1 when the eyeglasses F are placed and the measurement state is established. For example, the control unit 70 detects the pixel position of each index image constituting the first index pattern image 41 in the measurement image M1 and compares it with the pixel position of each index image in the reference image B1. This allows position information to be obtained about the passing position of the measurement light beam from the light source 21 passing through the first transmissive display 24a, which is disposed at a predetermined position in the optical axis direction.

[0082] Similarly, the control unit 70 detects where the index images in the reference image B2 have moved in the measurement image M2. For example, the control unit 70 detects the pixel position of each index image constituting the second index pattern image 51 in the measurement image M2 and compares it with the pixel position of each index image in the reference image B2. This allows position information to be obtained about the passing position of the measurement light beam from the light source 21, which has passed through the second transmissive display 24b arranged at a predetermined position in the optical axis direction.

[0083] <Getting the position of the bending point> Next, the control unit 70 obtains the position of the bending point of the left lens LEl by using the position information of the measurement light beam incident on the left lens LEl and the passing position where the measurement light beam from the light source 21a passes through two points in the optical axis direction.

[0084] Fig. 7 is a schematic diagram showing a measurement light beam irradiated by the light source 21a. Fig. 7(a) is a diagram showing the eyeglass lens facing forward relative to the light source 21a. Fig. 7(b) is a diagram showing the eyeglass lens tilted relative to the light source 21a. 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.

[0085] 7(a), the XY coordinates 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 XY coordinates (x0, y0) 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. Similarly, the XY coordinates of a measurement point Q2 on the left lens LEl correspond to the pixel position of a point Ta2 in the reference image B1 and the pixel position of a point Tb2 in the reference image B2.

[0086] For example, of the measurement light beam from the light source 21a toward the left lens LEl, a light ray R1 passing through a measurement point Q1 is refracted by the refractive power of the left lens LEl. For example, the control unit 70 compares the pixel positions of each index image in the reference image B1 with the pixel positions of each index image in the measurement image M1 to detect that the light ray R1 has passed through the first transmissive display 24a and that point Ta1 in the reference image B1 has moved to point Ta1' in the measurement image M1. Similarly, for example, the control unit 70 compares the pixel positions of each index image in the reference image B2 with the pixel positions of each index image in the measurement image M2 to detect that the light ray R1 has passed through the second transmissive display 24b and that point Tb1 in the reference image B2 has moved to point Tb1' in the measurement image M2.

[0087] For example, in Figure 7(b), because the eyeglass lens is tilted, the pixel positions of each target image in measurement image M1 and measurement image M2 are detected at positions different from the pixel positions in Figure 7(a). As a result, values ​​different from the optical characteristics of the original eyeglass lens fitted in the eyeglass frame are detected. For this reason, multiple positions of bending points, which are the intersection points of the measurement light beam of the measurement light beam incident on the eyeglass lens and the measurement light beam of the measurement light beam refracted by the eyeglass lens and incident on image sensor 27, are calculated based on the position information, and the tilt of the plane passing through the multiple bending points is obtained, thereby obtaining the tilt of the eyeglass lens, thereby making it possible to obtain the optical characteristics of the original eyeglass lens fitted in the eyeglass frame.

[0088] 7(b), the control unit 70 calculates the bending point z0 of the light ray R1 from the light source 21a, where the light ray R1 is refracted by the left lens LEl. For example, the bending point z0 of the light ray R1 can be calculated based on the distance L01 from the mounting surface PT to the first transmissive display 24a, the XY coordinates (x0, y0) of the measurement point Q1 on the left lens LEl, the distance L12 from the first transmissive display 24a to the second transmissive display 24b, the XY coordinates (x1, y1) of the point Ta1′ where the light ray R1 passes through the first transmissive display 24a, and the XY coordinates (x2, y2) of the point Tb1′ where the light ray R1 passes through the second transmissive display 24b. For example, the control unit 70 calculates the bending point z0 of each light ray relative to the mounting surface PT (the positioning pin 11 in this embodiment) of the left lens LEl using the following formula: The distance L01 from the placement surface PT to the first transmissive display 24a is known.

[0089]

number

[0090] Fig. 8 is a schematic diagram showing a state in which the optical axis of the eyeglass lens is tilted with respect to the measurement light beam emitted by the light source 21a. Fig. 8 shows the side where the left lens LEl is arranged, and does not show the side where the right lens LEr is arranged.

[0091] For example, if the eyeglass lens is tilted, the optical axis of the eyeglass lens is tilted with respect to the measurement light beam. As a result, a prism Δθ occurs (optical axis shift occurs) due to the tilt of the optical axis of the eyeglass lens, resulting in a deviation ΔS in the measurement image relative to the reference image. This may result in a deviation in the pixel positions of the measurement image M1 and the measurement image M2, resulting in an error in the bending point z0. Therefore, by correcting the deviation ΔS, the pixel positions of the reference image B1 and the reference image B2 are corrected to the correct positions. As an example, in this embodiment, the deviation ΔS is corrected based on the position coordinates (x0, y0) of the light ray R0 on the front side of the eyeglass lens, which is emitted from the light source 21a and passes through the optical center of the left lens LE1.

[0092] For example, because ray R0 passes through the optical center of the left lens LEl, it is not affected by the refractive power of the left lens LEl, and the pixel position of point Ta0' in measurement image M1 and the pixel position of point Tb0' in measurement image M2 are approximately the same (see FIG. 7(a)). Therefore, even for ray R0' on the rear surface of the spectacle lens, which is refracted by the prism Δθ associated with the tilt of the spectacle lens and passes through the optical center of the left lens LEl, the pixel position of point Ta0' in measurement image M1 and the pixel position of point Tb0' in measurement image M2 are approximately the same. For this reason, for example, the control unit 70 acquires, as the ray R0' on the rear surface of the spectacle lens, a ray for which the pixel position of point Ta0' in measurement image M1 and the pixel position of point Tb0' in measurement image M2 are approximately the same. The control unit 70 also acquires the amount of deviation ΔS of the position coordinate Q1(x0, y0) of the light beam R0 on the front side of the eyeglass lens from the position coordinate Q1'(x0', y0') of the light beam R0' on the rear side of the eyeglass lens. For example, the control unit 70 corrects the amount of deviation ΔS based on the prism Δθ accompanying the tilt of the optical axis of the eyeglass lens by correcting (shifting) the pixel positions of the measurement image M1 and the measurement image M2 to the correct positions based on this amount of deviation ΔS. Note that the amount of deviation ΔS is not limited to the above description, and may be acquired from the results of experiments or simulations.

[0093] After correcting the pixel positions of the measurement images M1 and M2 to the correct positions, the control unit 70 acquires the position of the bending point, which is the intersection of the ray R0 of the measurement light beam incident on the eyeglass lens and the straight line of the ray R0' of the measurement light beam that is bent by the eyeglass lens and incident on the detector.

[0094] For example, the control unit 70 determines the bending points of each ray of light with respect to the placement surface PT of the left lens LE1 (see Equation 1). More specifically, the control unit 70 calculates a plurality of bending points, which are the intersections of the direction of a line formed by connecting the position coordinates (x1, y1) in the XY directions of a point Ta1' where the ray of light R1 passes through the first transmissive display 24a (in other words, a point in the first index pattern displayed on the first transmissive display) and the position coordinates (x2, y2) in the XY directions of a point Tb1' where the ray of light R1 passes through the second transmissive display 24b (in other words, a point in the second index pattern displayed on the second transmissive display), and the direction of the line extending toward the rear surface of the eyeglass lens with the straight line of the measurement ray R1 irradiated toward the eyeglass lens on the front side of the eyeglass lens. As a result, the control unit 70 obtains bending points z1, z2, z3, and z4 for the ray of light R1, the ray of light R2, the ray of light R3, and the ray of light R4, respectively. Using the same procedure, multiple bending points are calculated based on the number of points (i.e., the number of rays) of the acquired index pattern.

[0095] <Acquisition of the tilt direction and amount of tilt of eyeglass lenses> Next, the control unit 70 calculates a plane that passes through multiple bending points and obtains the tilt of the calculated plane, thereby obtaining the tilt of the eyeglass lens. Figures 9 and 10 are schematic diagrams showing the acquisition of the tilt direction and tilt amount of the eyeglass lens. Figure 9 is a schematic diagram showing the acquisition of the tilt of the eyeglass lens based on the bending points of each light ray. Figure 10 is a schematic diagram showing the formation of a plane that passes through the positions of multiple bending points.

[0096] As an example, as shown in FIG. 9, an approximation curve (or straight line) 100 that is most approximate to the acquired bending points z1 to z4 is drawn. For example, the tilt direction and tilt amount α° of the approximation curve 100 of the reference mounting surface PT are acquired. This makes it possible to acquire the tilt direction and tilt amount α° of the left lens LE1 in the X direction with respect to the reference mounting surface PT (in this embodiment, the positioning pin 11). The control unit 70 acquires the tilt direction and tilt amount of the left lens LE1 in the Y direction using a similar procedure. Furthermore, by drawing an approximation curve (or straight line) based on the number of points (i.e., the number of light rays) of the acquired index pattern, it is possible to form a surface 100 that passes through the positions of multiple bending points, as shown in FIG. 10. This allows the control unit 70 to acquire the tilt direction and tilt amount of the surface 100 that passes through the multiple bending points with respect to the reference mounting surface PT (in this embodiment, the positioning pin 11). Furthermore, the control unit 70 acquires the tilt direction and tilt amount of the right lens LEr using a similar procedure. The tilt direction and tilt amount are not limited to the method described above, and various methods can be used.

[0097] <Obtaining the optical characteristics of a tilted lens> For example, once the tilt direction and tilt amount of the left lens LEl and the right lens LEr are acquired, the control unit 70 acquires the optical characteristics of the eyeglass lenses. For example, after acquiring the optical characteristics of the eyeglass lenses fitted into the eyeglass frames, the control unit 70 acquires the optical characteristics of the eyeglass lenses by correcting the optical characteristics of the eyeglass lenses based on the warp angle and forward tilt angle of the eyeglass frames (i.e., the tilt direction and tilt amount of the eyeglass lenses) to cancel the warp angle and forward tilt angle of the eyeglass frames. This allows the operator to properly acquire the original optical characteristics of the eyeglass lenses that are not affected by the warp angle and forward tilt angle of the eyeglass frames. For details on acquiring and correcting the optical characteristics of eyeglass lenses, please refer to JP 2021-117210 A.

[0098] <Example of transformation> In the measurement device 1 of this embodiment, the first transmissive display 24a and the second transmissive display 24b are provided as the transmissive display 24. However, the present invention is not limited to this. For example, the transmissive display 24 may be configured such that one transmissive display is movable to a plurality of different positions in the optical axis direction.

[0099] For example, in a measurement optical system having one transmissive display, a movement mechanism (e.g., a motor) may be provided to move the transmissive display 24 along the optical axis N1. This allows positional information to be acquired on the positions where the measurement light beam from the light source passes through at least two points along the optical axis, similar to when two transmissive displays are used.

[0100] Note that a configuration without using a transmissive display is also acceptable as long as positional information of the passing positions where the measurement light beam from the light source passes through at least two points in the optical axis direction can be obtained. As an example, a light source, an index pattern member, and a detector may be provided, and a moving mechanism (e.g., a motor) for moving the index pattern member in the optical axis direction may be provided, thereby obtaining positional information of the passing positions where the measurement light beam from the light source passes through at least two points in the optical axis direction.

[0101] In the measurement device 1 of this embodiment, a configuration has been described in which the most approximate approximation curve (straight line) is drawn based on all of the bending points z1 to z4 (see FIG. 9) and the amount of inclination α° of the approximation curve (straight line) with respect to the reference mounting surface PT is obtained, but this is not limiting. For example, it is also possible to obtain the inclination of a surface passing through the positions of multiple bending points by excluding a predetermined region where the refraction of light rays is equal to or less than a threshold.

[0102] For example, in areas such as those close to the optical center where the refractive power of the eyeglass lens is less affected, the amount of prism is small, which can result in large errors when drawing an approximate curve (straight line). For this reason, for example, from among bending points z1 to z4, bending point z3 of ray R3, which is close to the optical center of the eyeglass lens, can be excluded, and an approximate curve (straight line) can be drawn based on z1, z2, and z4 to obtain the tilt of the surface passing through the positions of the multiple bending points relative to the reference mounting surface PT. This makes it possible to obtain the tilt direction and amount of tilt of the eyeglass lens with high accuracy.

[0103] In the measuring device 1 of this embodiment, if the tilt direction and tilt amount of the left lens LEl and the tilt direction and tilt amount of the right lens LEr are not the same (approximately the same, hereafter including approximately the same) values, an alert indicating a measurement abnormality may be output.

[0104] For example, if the control unit 70 determines that the tilt direction and tilt amount of the left lens LEl and the tilt direction and tilt amount of the right lens LEr are not the same, it displays a message indicating an abnormality on the monitor 4. For example, when the operator confirms the message displayed on the monitor 4, he or she may repeat the measurement to obtain the tilt direction and tilt amount. For example, the tilt of eyeglass lenses set in an eyeglass frame is often symmetrical. Therefore, by outputting an alert when the tilt direction and tilt amount of the left and right eyeglass lenses are different, it becomes easier to grasp measurement abnormalities, etc., and the tilt direction and tilt amount of the eyeglass lenses can be obtained with high accuracy. [Explanation of symbols]

[0105] 1 Eyeglass lens measuring device 10. Eyeglass support unit 20 Measurement optical system 21 Light source 24 Transmissive Display 25 Retroreflective material 27 Image sensor 70 Control Unit 75 memory

Claims

1. An eyeglass lens measuring device for measuring eyeglass lenses, a light source that irradiates a measurement light beam toward the eyeglass lens; a transmissive display that transmits the measurement light beam from the light source and is capable of displaying an index pattern formed by arranging a plurality of indexes; a display control means for controlling the display of the index pattern; a detector that detects the measurement light beam that has passed through the eyeglass lens and the transmissive display; a position information acquiring unit that acquires position information indicating a passing position of the measurement light beam from the light source through the transmissive display based on the detection result by the detector; a tilt calculation means for acquiring a tilt of the eyeglass lens based on a plurality of measurement light beams passing through different positions based on the position information of the transmissive display; An eyeglass lens measurement device comprising:

2. 2. The eyeglass lens measurement device according to claim 1, The inclination calculation means calculates, based on the position information, a plurality of positions of bending points, which are the intersections of the measurement light beam of the measurement light beam incident on the eyeglass lens and the measurement light beam of the measurement light beam refracted by the eyeglass lens and incident on the detector, and obtains the inclination of the plane passing through the positions of the plurality of bending points, thereby obtaining the inclination of the eyeglass lens.

3. 3. The eyeglass lens measuring device according to claim 1, the transmissive display includes a first transmissive display capable of displaying a first index pattern, and a second transmissive display capable of displaying a second index pattern, the second transmissive display being disposed at a position different from that of the first transmissive display in the optical axis direction; The eyeglass lens measuring device, wherein the detector detects the measurement light beam that has passed through the first transmissive display and further passed through the second transmissive display.

4. The eyeglass lens measurement device according to any one of claims 1 to 3, The spectacle lens measurement device is characterized in that the tilt calculation means obtains the tilt of the surface passing through the positions of the multiple bending points, excluding a predetermined area where the refraction of the measurement light beam is below a threshold.

5. 5. The eyeglass lens measurement device according to claim 1, The eyeglass lens measurement device is characterized in that the tilt calculation means outputs an alert when the calculation results of the tilt of the eyeglass lenses fitted in the eyeglass frames are different for the left and right eyeglass lenses.

6. 6. The eyeglass lens measurement device according to claim 1, a correction unit that corrects a deviation of the measurement light beam that has passed through the eyeglass lens due to an optical axis of the eyeglass lens being tilted with respect to the measurement light beam that is irradiated toward the eyeglass lens, The spectacle lens measurement device is characterized in that the tilt calculation means calculates the position of the bending point based on the measurement light beam corrected by the correction means.

7. A spectacle lens measurement program executed by a spectacle lens measurement device that measures optical characteristics of a spectacle lens, The eyeglass lens measuring device includes: a transmissive display that transmits a measurement light beam from a light source and is capable of displaying an index pattern formed by arranging a plurality of indices; a detector that detects the measurement light beam that has passed through the eyeglass lens and the transmissive display; Equipped with When executed by the processor of the eyeglass lens measurement device, a display control step of displaying the index pattern on the transmissive display; a position information acquiring step of acquiring position information indicating a passing position of the measurement light beam from the light source through the transmissive display based on the detection result by the detector; a tilt calculation step of acquiring a tilt of the eyeglass lens based on a plurality of measurement light beams passing through different positions based on the position information of the transmissive display; The spectacle lens measuring device executes the above. In the tilt calculation step, the positions of the bending points, which are the intersections of the measurement light beam incident on the eyeglass lens and the measurement light beam bent by the eyeglass lens and incident on the detector, are calculated based on the position information, and the tilt of the eyeglass lens is obtained by obtaining the tilt of the plane passing through the positions of the bending points.

Images