JP6536029B2 - Lens meter and calculation program - Google Patents

Description

  The present disclosure relates to a lens meter that measures optical characteristics of an eyeglass lens, and an arithmetic program executed by an arithmetic device that calculates optical characteristics of an eyeglass lens.

  In a lens meter for measuring the optical characteristics of a spectacle lens, a pair of left and right measurement optical systems for measuring the optical characteristics of the left and right spectacle lenses and a pair of left and right mountings provided so as to be able to mount the left and right spectacle lenses. A lens meter is known which comprises a holder. In the case of such an apparatus, measurement is performed after automatically adjusting the position of the glasses placed on the placement unit and positioning the glasses at a predetermined position (for example, see Patent Document 1). ).

Japanese Patent Application Laid-Open No. 2002-257680

  By the way, in the case of the above apparatus, while the complicated structure for adjusting the position of spectacles separately is needed, the control is complicated. In addition, in the case of using a lens meter not provided with a configuration for adjusting the position, the measurer needs to move the glasses with respect to the measurement optical system (mounting portion) to perform position adjustment. However, such adjustments are very difficult and time consuming. In addition, when the adjustment is not performed well, it is not possible to obtain (calculate) at least one of the optical characteristic (for example, the astigmatic axis angle) of the spectacle lens and the interpupillary distance with high accuracy.

  This indication makes it a technical subject to provide a lens meter which can acquire at least one of the optical characteristic of an eyeglass lens, and distance between pupils easily with sufficient accuracy in view of the above-mentioned problem.

  In order to solve the above-mentioned subject, the present invention is characterized by having the following composition.

(1) A lens meter according to a first aspect of the present disclosure measures left and right spectacle lenses placed on a pair of left and right placement parts provided so as to be able to place the left and right spectacle lenses of glasses respectively A lens meter comprising: a pair of measurement optical systems; and calculation means for calculating optical characteristics of the left and right eyeglass lenses based on measurement results of the left and right eyeglass lenses measured by the measurement optical system, the calculation The means calculates the amount of displacement of the optical center of the spectacle lens with respect to the optical axis of the measurement optical system based on the optical characteristics of the left and right spectacle lenses, and the astigmatism included in the optical characteristics based on the deviation amount. It is characterized in that the axis angle is corrected.
(2) The lens meter according to the second aspect of the present disclosure includes the optical characteristics of the left and right spectacle lenses mounted on the pair of left and right mounting portions provided so that the left and right spectacle lenses of the glasses can be mounted respectively A lens meter comprising: a pair of left and right measurement optical systems to be measured; and an operation means for calculating optical characteristics based on measurement results measured by the measurement optical systems, wherein the operation means is included in the optical characteristics Calculate the horizontal displacement amount in the horizontal direction and the vertical displacement amount in the vertical direction of the optical center of the eyeglass lens with respect to the optical axis of the measurement optical system based on the amount of prisms and the displacement direction information Correction of the inter-pupil distance based on the above, and the astigmatic axis angle included in the optical characteristic based on the inter-pupil distance corrected based on the horizontal displacement amount and the vertical displacement amount. Either And correcting the interpupillary distance corrected based on the horizontal displacement amount based on the interpupillary distance corrected based on the horizontal displacement amount and the vertical displacement amount. I assume.
(3) An arithmetic program according to a third aspect of the present disclosure is an arithmetic program executed by an arithmetic device that calculates optical characteristics of an eyeglass lens based on the measurement result of the eyeglass lens measured by a lens meter, Optical characteristics from a lens meter including a pair of left and right measurement optical systems for measuring the optical characteristics of the left and right spectacle lenses mounted on the left and right pair of mounting portions provided so as to be able to mount the left and right spectacle lenses respectively And calculating a displacement amount of the optical center of the spectacle lens with respect to the optical axis of the measurement optical system based on the optical characteristic, and correcting the optical characteristic based on the displacement amount. And.. Are executed by the arithmetic device.

It is an external appearance schematic of the lens meter which concerns on this embodiment. It is a schematic block diagram of an optical system of a lens meter concerning this embodiment, and a control system. It is a figure which shows an example of the parameter | index pattern formed in the grid board. The flowchart which demonstrates the acquisition operation of an optical characteristic is shown. It is a figure which shows an example of the spectacles mounted in the lens holder. The flowchart which illustrates operation | movement of a correction process is shown. It is a figure explaining acquisition of the optical characteristic which corrected rotation of an eyeglass frame. It is a figure explaining the concept for correcting an optical characteristic.

Exemplary embodiments of the present disclosure will be described based on the drawings. In the present embodiment, the depth direction of the lens meter (upper and lower end directions of the eyeglass frame when the glasses are arranged) is Z direction (vertical direction of the optical center of the eyeglass lens) and perpendicular to the depth direction The horizontal direction on the plane of the eyeglass frame at the time of shooting is described as the X direction (horizontal direction of the optical center of the eyeglass lens) and the vertical direction as the Y direction. In the present embodiment, the configuration in the case of acquiring both the optical characteristics of the spectacle lens and the inter-pupil distance of the spectacle lens with high accuracy will be described as an example, but the present invention is not limited to this. The technique of the present disclosure can be used to accurately acquire at least one of the optical characteristics of the spectacle lens and the inter-pupil distance of the spectacle lens.
FIG. 1 is a schematic view of the lens meter according to the present embodiment. For example, the lens meter 1 in the present embodiment includes the display 2, the placement unit 4, the lens table 7, the operation unit 8, and the like.

For example, the display (monitor) 2 may be a display mounted on the device body or a display connected to the body. A display of a personal computer (hereinafter referred to as "PC") may be used. Multiple displays may be used together. Further, the display 2 may be a touch panel. When the display 2 is a touch panel, the display 2 may function as an operation unit. The display 2 displays the optical characteristic (optical characteristic data) of the spectacle lens obtained by the measurement of the spectacle lens.
For example, the placement unit 4 is connected (installed) to the lens table 7. For example, as the mounting unit 4, a lens holder on which the spectacle lens LE is mounted, a frame support unit on which the spectacle frame F to which the spectacle lens LE is attached is mounted, and the like can be given. That is, the placement unit 4 may be any one that can support the glasses L. In the present embodiment, a lens receiver (lens support unit) is used as the placement unit 4. For example, as the lens receiver 4 in the present embodiment, a mounting member that supports one of the left and right eyeglass lenses at two points is used. In addition, the lens holder 4 is not limited to what supports one eyeglass lens on either side at two points. The lens receiver may be any one that can support the spectacle lens on one or both sides. For example, one eyeglass lens may be supported at one point, three points, four points or the like. Also, for example, the entire surface of the lens receiver 4 may support the spectacle lens.

  Further, in the present embodiment, the lens receiver 4 has a pair of left and right lens receivers of the left side lens receiver 4L and the right side lens receiver 4R. The left and right eyeglass lenses are supported by the left side lens receiver 4L and the right side lens receiver 4R. In the lens meter of the present embodiment, when the spectacle lens is placed on the lens receiver 4, the lower end of the spectacle frame is positioned on the back side of the lens meter and the upper end of the spectacle lens is positioned on the front side Placed on Of course, the lens meter may be a lens meter which is placed with the upper end of the eyeglass frame on the back side of the lens meter and the lower end of the eyeglass lens on the front side to perform measurement.

  For example, the operation unit 8 is used to output a measurement start signal for starting measurement of the spectacle lens to the control unit 40 (see FIG. 2). For example, when the operation unit 8 is operated, the control unit 40 starts measurement and acquires (calculates) the optical characteristic and the interpupillary distance. The control unit 40 displays the acquired optical characteristic and inter-pupil distance on the display 2 and stores the same in the memory 42 (see FIG. 2) of the lens meter 1. For example, in the present embodiment, a switch is used as the operation unit 8. Note that, for example, a mouse, a keyboard, a touch panel or the like may be used as the operation unit 8. In addition, it is not limited to the structure by which measurement is started by operation in the operation part 8. FIG. It may be configured to detect that the glasses have been placed on the lens meter, to start measurement, and to acquire (calculate) the optical characteristics and the interpupillary distance. In this case, for example, the acquired optical characteristics and the interpupillary distance are displayed on the display and stored in the memory 42.

  FIG. 2 is a schematic configuration diagram of a measurement optical system and a control system in the present embodiment. In the present embodiment, a pair of left and right measurement optical systems are provided inside the lens meter 1 in order to measure the left and right eyeglass lenses, respectively. The lens meter 1 also includes a control unit 40 that controls the operation of the entire apparatus. When the measurement is started, the lens meter 1 of the present embodiment can acquire the optical characteristics of the left and right eyeglass lenses without moving the glasses with respect to the measurement optical system. The left and right measurement optical systems have the same configuration. In the following description, since the left-right paired configuration is the same, one configuration (left-side configuration) will be described as an example.

  For example, the measurement optical system 10L on the left side is a measurement light source 11, a collimating lens 12, and a grid plate 14, 2 which is a measurement index plate on which a predetermined index pattern (see FIG. 3) having a certain regularity is formed. The dimensional light receiving sensor 15 is provided. For example, the grid plate 14 is held by the holding member 16 of the lens meter 1, and the opening 4 a of the lens receiver 4 L is located above the grid plate 14. In addition, the opening of the opening 4a in this embodiment is a circle having a diameter of 8 mm. Note that, as another configuration of the index pattern formed on the measurement index plate, for example, a lattice pattern regularly arranged can be considered.

  For example, the control unit 40 includes a CPU (processor), a RAM, a ROM, and the like. The CPU of the control unit 40 controls the entire apparatus. The RAM temporarily stores various information. The ROM of the control unit 40 stores various programs for controlling the operation of the entire apparatus, initial values, and the like. The control unit 40 may be configured by a plurality of control units (that is, a plurality of processors).

  For example, the control unit 40 is electrically connected to a non-volatile memory (storage unit) 42, an operation unit (switch) 8, a display 2, and the like. The non-volatile memory (memory) 42 is a non-transitory storage medium capable of retaining stored contents even when the supply of power is shut off. For example, a hard disk drive, a flash ROM, and a USB memory detachably attached to the lens meter 1 can be used as the non-volatile memory 42. The memory 42 stores a measurement control program for acquiring the optical characteristics of the spectacle lens by the measurement optical system and the inter-pupil distance.

  FIG. 3 is a view showing an example of the index pattern formed on the grid plate 14 in the present embodiment. The outer diameter of the grid plate 14 is formed slightly larger than the inner diameter of the opening 4a of the lens receiver 4L. On the rear surface of the grid plate 14 (the surface on the light receiving sensor 15 side), a measurement index 20 consisting of a large number of circular holes is formed. The measurement index 20 in the present embodiment is composed of a central hole 21 formed at a central position through which the measurement optical axis L1 (see FIG. 2) passes and a large number of small holes 22 arranged in a lattice shape around it. The central hole 21 is a reference index for specifying the correspondence of the other holes 21, that is, each dot corresponding to when the lens LE is placed with respect to the "0D reference" in the state without the lens LE. Used as a reference indicator to identify the image. The control unit 40 stores in the memory 42 the coordinates of the dot image (index image) of the “0D reference” detected in the absence of the lens LE when the power of the apparatus is turned on, measurement information, and the like. Of course, the coordinates of the dot image (index image) of “0D reference” and measurement information may be stored in the memory 42 in advance. Further, the small hole 22 outside the light receiving surface of the light receiving sensor 15 is provided so as to be received by the light receiving sensor 15 when the prismatic power is generated by arranging in the measurement light path of the test lens LE. It is.

  The measurement optical system capable of measuring the dioptric power distribution in a predetermined region such as the inside of the opening 4a of the lens receiver 4 is not limited to the configuration shown in FIG. For example, the grid plate 14 may be disposed closer to the light source 11 than the lens LE, or the light source 11 may be disposed in a grid. As the measurement of the dioptric power distribution, it is preferable to form measurement positions in the vertical direction and the horizontal direction centering on at least the measurement optical axis.

In the above description, the measurement optical system 10L on the left side is described as an example, but the measurement optical system on the right side has the same configuration. Therefore, the description of the measurement optical system on the right side is omitted.
Hereinafter, a series of optical characteristics using the lens meter having the above-described configuration and an operation for acquiring the inter-pupil distance will be described. FIG. 4 shows a flowchart for explaining the acquisition operation of the optical characteristic and the inter-pupil distance.

  First, the measurer places the glasses on the lens meter 1. The measurer places the glasses on the lens meter 1 by placing the left and right eyeglass lenses on the left and right lens receivers 4L and 4R. Then, the measurer presses the switch 8. When the switch 8 is pressed, the control unit 40 turns on the light sources 11 of the pair of left and right measurement optical systems, and performs measurement of the spectacle lens (S1).

  The luminous flux from the measurement light source 11 is converted into a parallel luminous flux by the collimating lens 12 and then projected onto the spectacle lens LE mounted on the lens receiver 4L. Then, among the light transmitted through the spectacle lens LE, the light flux passing through the hole 21 and the hole 22 of the grid plate 14 is received by the light receiving sensor 15 as an index pattern image.

  An output signal from the light receiving sensor 15 is input to the control unit 40. The control unit 40 uses the coordinate position of the dot image of the small hole 22 incident on the light receiving sensor 15 as a reference when the lens LE is not mounted. The optical characteristics (spherical power S, cylindrical power C, astigmatic axis angle A, prism amount Δ) of the lens LE are calculated from the positional change of each dot image when the lens LE having a predetermined refractive power is placed (S2) ). Further, the control unit 40 calculates the displacement direction (displacement direction information) in which the prism is generated as the optical characteristic (optical characteristic information). The direction of deviation indicates the direction in which the prism is generated with respect to the optical axis L1 of the measurement optical system.

  For example, when a spherical lens having a positive power is placed, the index pattern image (dot pattern image) in which the distance between the dot images is smaller is smaller than that on the light receiving sensor 15 compared to the case where there is no test lens LE. Projected to On the other hand, when a spherical lens having minus dioptric power is placed, an index pattern image in which the distance between dot images is increased is projected on the light receiving sensor 15 as compared with the case where there is no test lens LE. When an astigmatic lens having a predetermined astigmatic axis is placed, an index pattern image distorted in an elliptical shape is projected according to the astigmatic axis and the astigmatic power of the lens. The amount of prismatic movement Δ and the amount of displacement are determined by the amount of parallel movement of the central dot image of the lens LE or the dot image in the vicinity thereof (see, for example, Japanese Patent Application Laid-Open No. 2008-241694).

  Here, when the optical characteristic O is placed with the optical center O of the spectacle lens shifted with respect to the optical axis L1 of the pair of left and right measurement optical systems, the optical characteristic of the spectacle lens is measured. It can not be acquired well (see Figure 5). For example, since the astigmatic axis angle A in the optical characteristics is rotated (tilted) with respect to the optical axis L1 of the measurement optical system, the astigmatic axis angle A in the rotated state is acquired Resulting in. Therefore, a shift occurs in the calculation result of the astigmatic axis angle A. In addition, the distance between the left and right eyeglass lenses (distance between the optical centers of the left and right eyeglass lenses) is rotated (inclined) with respect to the optical axis L1 of the measurement optical system. The pupillary distance in the rotated state is obtained. For this reason, a shift occurs in the calculation result of the inter-pupil distance. For these reasons, the optical characteristics and the interpupillary distance can not be obtained well. Therefore, it is necessary to obtain the optical characteristics and the interpupillary distance in consideration of the rotation of the eyeglass frame.

  It returns to description of acquisition operation of an optical characteristic and an interpupil distance. When the calculation of the optical characteristic is completed from the measurement result, the control unit 40 calculates the displacement amount of the optical center O of the spectacle lens LE with respect to the optical axis L1 of the measurement optical system based on the optical characteristic (S3). For example, as the deflection amount, at least one of the horizontal deflection amount in the horizontal direction (horizontal direction of the optical center of the spectacle lens) and the vertical deflection amount in the vertical direction (vertical direction of the optical center of the spectacle lens) is used. Configuration is mentioned. In the present embodiment, the horizontal displacement amount and the vertical displacement amount are calculated as the displacement amounts. This will be described with reference to FIG. The eyeglass frame portion located on the upper side on the paper surface of FIG. 5 is the lower end of the eyeglass frame, and the eyeglass frame F portion located on the lower side on the paper surface is the upper end FF.

  The control unit 40 calculates the distance in the horizontal direction between the optical axis L1 of each of the left and right measurement optical systems and the optical center O of each of the left and right eyeglass lenses LEL and LER as the horizontal displacement amounts ΔX1 and ΔX2. For example, the horizontal displacement amount ΔX1 indicates the displacement amount in the horizontal direction of the left eyeglass lens LEL. Further, the horizontal displacement amount ΔX2 indicates the displacement amount of the right eyeglass lens LER in the horizontal direction.

  The control unit 40 calculates the distance in the vertical direction between the optical axis L1 of each of the left and right measurement optical systems and the optical center O of each of the left and right eyeglass lenses LEL and LER as the vertical displacement amounts ΔZ1 and ΔZ2. For example, the vertical displacement amount ΔZ1 indicates the displacement amount of the left eyeglass lens LEL in the vertical direction. The vertical displacement amount ΔZ2 indicates the displacement amount in the vertical direction of the right eyeglass lens LER.

  For example, the horizontal displacement amounts ΔX1 and ΔX2 and the vertical displacement amounts ΔZ1 and ΔZ2 are calculated using the formula of Prentice. The controller 40 calculates horizontal displacement amounts ΔX1 and ΔX2 and vertical displacement amounts ΔZ1 and ΔZ2 using the formula of Prentice. The horizontal displacement amounts ΔX1 and ΔX2 and the vertical displacement amounts ΔZ1 and ΔZ2 are calculated as positive values (for example, 4 mm or the like) or negative values (for example, -4 mm or the like).

  In the present embodiment, when the horizontal displacement amounts ΔX1 and ΔX2 are positive values, it indicates that the optical center O of the spectacle lens LE is shifted to the left side (left side on the drawing sheet in FIG. 5) of the measurement optical system. Is configured. Of course, when the horizontal displacement amounts ΔX1 and ΔX2 are positive values, it may be configured to indicate that the optical center O of the spectacle lens LE is shifted to the right of the measurement optical system. For example, when the horizontal displacement amount ΔX1 of the left eyeglass lens LEL is a positive value, the optical center O of the eyeglass lens is outside the optical axis L1 of the measurement optical system on the left side by the deviation amount ΔX1 It can be seen that it is located (outside the glasses frame). When the horizontal displacement amount ΔX2 of the right-hand eyeglass lens LER is a positive value, the optical center O of the eyeglass lens is more inward than the optical axis L1 of the right-hand measurement optical system by the deviation amount ΔX2 It can be seen that it is located (inside the glasses frame). In addition, when the amount of horizontal deviation is a negative value, the result described above is reversed.

  For example, in FIG. 5, the horizontal displacement amount ΔX1 of the left eyeglass lens LEL is calculated as a positive value. Further, the horizontal displacement amount ΔX2 of the right eyeglass lens LER is calculated as a negative value.

  Further, in the present embodiment, when the vertical displacement amounts ΔZ1 and ΔZ2 are positive values, the optical center O of the spectacle lens LE is closer to the front side than the optical axis L1 of the measurement optical system (lower side in FIG. It shows that it is shifted to). That is, when the vertical displacement amount ΔZ1 of the left eyeglass lens LEL is a positive value, the optical center O of the eyeglass lens is lower than the optical axis L1 of the left measurement optical system by the deviation amount ΔZ1. It can be seen that it is located on the side (the upper end FF side of the eyeglass frame). When the vertical displacement amount ΔZ2 of the right-hand eyeglass lens LER is a positive value, the optical center O of the eyeglass lens is lower than the optical axis L1 of the right-hand measurement optical system by the deviation amount ΔZ2. It can be seen that it is located on the side (the upper end FF side of the eyeglass frame). In addition, when the amount of vertical displacement is a negative value, the result described above is reversed. For example, in FIG. 5, the vertical displacement amount ΔZ1 in the left-hand spectacle lens LEL is calculated as a positive value. Further, the vertical displacement amount ΔZ2 of the right-hand eyeglass lens LER is calculated as a negative value.

  Next, the control unit 40 performs correction processing of the optical characteristic and the inter-pupil distance based on the calculated displacement amount (S5). FIG. 6 shows a flowchart for explaining the operation of the correction process. First, the control unit 40 calculates the distance (inter-pupil distance) PD1 between the optical centers of the left and right eyeglass lenses based on the horizontal displacement amounts ΔX1 and ΔX2. In the present embodiment, the left and right measurement optical systems are fixed, and the distance between the optical axes L1 of the left and right measurement optical systems is set in advance. Therefore, by correcting the distance PD (fixed PD) between the optical axes L1 of the left and right measurement optical systems using the horizontal displacement amounts ΔX1 and ΔX2, the distance between the optical centers O of the left and right eyeglass lenses A certain interpupillary distance PD1 can be acquired (S51). Note that, for example, the distance PD between the optical axes L1 of the left and right measurement optical systems is set to an average interpupillary distance of the subject (for example, 64 mm or the like). Of course, the distance PD between the optical axes L1 of the left and right measurement optical systems can be configured at an arbitrary distance.

  For example, the control unit 40 performs processing for adding or subtracting the horizontal displacement amounts ΔX1 and ΔX2 to the distance PD between the optical axes L1 (adding processing or subtraction processing), so that the distance between the optical axes L1 is The distance PD is corrected to obtain the inter-pupil distance PD1. In the present embodiment, the position of the optical center O of each spectacle lens is the optical axis L1 as to whether the process of adding or subtracting the horizontal displacement amounts ΔX1 and ΔX2 is performed. It can be set depending on whether it is located outside, inside or inside. For example, when the position of the optical center O of each spectacle lens is located outside the optical axis L1 based on the result of whether the amount of horizontal deviation is a positive value or a negative value, and the optical of the spectacle lens The case where the position of the center O is located inside the optical axis L1 can be identified.

  For example, in each of the spectacle lenses, when the position of the optical center O of the spectacle lens is positioned outside the optical axis L1, the control unit 40 determines the horizontal displacement amount ΔX1, with respect to the distance PD between the optical axes L1. A process of adding ΔX2 minutes is performed. In each of the spectacle lenses, when the position of the optical center O of the spectacle lens is positioned inside the optical axis L1, the control unit 40 determines the horizontal displacement amount ΔX1, with respect to the distance PD between the optical axes L1. A process of subtracting ΔX2 is performed. In each of the spectacle lenses, the position of the optical center O of the left spectacle lens is located inside the optical axis L1, and the position of the optical center O of the right spectacle lens is located outside the optical axis L1. The control unit 40 subtracts the horizontal displacement amount ΔX1 from the distance PD between the optical axes L1 and adds ΔX2 to the distance PD. In each of the spectacle lenses, the position of the optical center O of the left spectacle lens is located outside the optical axis L1, and the position of the optical center O of the left spectacle lens is located inside the optical axis L1. The control unit 40 adds the horizontal displacement amount ΔX1 to the distance PD between the optical axes L1 and subtracts ΔX2 from the distance PD.

  For example, in the case shown in FIG. 5, the control unit 40 performs processing of adding the horizontal displacement amount ΔX1 and the horizontal displacement amount ΔX2 to the distance PD between the optical axes L1, respectively. The distance PD between the optical axes L1 is corrected. By this, the inter-pupil distance PD1 (corrected PD) is acquired.

  Next, the control unit 40 re-corrects the corrected inter-pupil distance PD1 based on the inter-pupil distance PD1 corrected based on the horizontal displacement amount and the vertical displacement amounts ΔZ1 and ΔZ2 (S52) ). That is, the interpupillary distance PD1 calculated by the above-described correction processing in S1 does not take into account the rotation of the eyeglass frame F, and when the eyeglass frame F is rotating, the actual practice of the eyeglass lens There is a gap with the interpupillary distance of. Therefore, the interpupillary distance in which the rotation of the eyeglass frame F is corrected is acquired using the interpupillary distance PD1 corrected based on the horizontal displacement amount and the vertical displacement amounts ΔZ1 and ΔZ2.

FIG. 7 is a diagram for explaining acquisition of optical characteristics and inter-pupil distance in which the rotation of the eyeglass frame F is corrected. FIG. 8 is a diagram for explaining the concept of correcting the optical characteristics and the interpupillary distance. For example, as shown in FIG. 7, when the eyeglass frame F rotates by an angle θ, the inter-pupil distance PD1 is different from the actual inter-pupil distance PD2.
In the present embodiment, for example, the position where the position of the eyeglass frame F is not rotated (the position where the angle θ is 0 °) means the upper end FF of the left eyeglass frame FL and the upper end FF of the right eyeglass frame FR. And the reference line B connecting the horizontal lines. Of course, the setting of the position where the position of the eyeglass frame F is not rotated (the position where the angle θ is 0 °) is not limited to this. For example, even if the position where the position of the eyeglass frame F is not rotated is set such that a reference line connecting the lower end FD of the left eyeglass frame FL and the lower end FD of the right eyeglass frame FR is horizontal. Good. Also, for example, the side wall surface 7a (see FIG. 1) of the lens table 7 of the lens meter 1 may be used as a reference line.
For example, an angle θ indicating the amount of rotation of the eyeglass frame F is a straight line B 'connecting the upper end FF of the left eyeglass frame FL and the upper end FF of the right eyeglass frame FR when the eyeglass lens LE is measured. And the reference line B, it is shown by the angle which it forms.

  For example, in the present embodiment, when acquiring the actual interpupillary distance PD2, the difference amount between the vertical displacement amount ΔZ1 of the left eyeglass lens LEL and the vertical displacement amount ΔZ2 of the right eyeglass lens LER (left eye lens The distance in the vertical direction between the optical center of the LEL and the optical center of the right eyeglass lens LER) ΔZ, and the corrected interpupillary distance PD1. For example, the actual interpupillary distance PD2 can be calculated according to the following equation (1) using the Pythagorean theorem from the difference amount ΔZ and the corrected interpupillary distance PD1.

  As described above, the control unit 40 re-compensates the inter-pupil distance PD1 corrected based on the inter-pupil distance PD1 corrected based on the horizontal displacement amount and the vertical displacement amounts ΔZ1 and ΔZ2. Processing is performed to obtain an actual interpupillary process (interpupillary distance corrected for rotation of the eyeglass frame F) PD2.

  Next, the control unit 40 acquires rotation information of the eyeglass frame F based on the inter-pupil distance PD1 corrected based on the horizontal displacement amount and the vertical displacement amounts ΔZ1 and ΔZ2 (S54). The control unit 40 corrects the astigmatic axis angle using the acquired rotation information of the eyeglass frame F (S55). For example, when the eyeglass frame F is rotated by the angle θ, the astigmatic axis angle is different from the actual astigmatic axis angle because the eyeglass frame F deviates by the angle θ. That is, the astigmatic axis angle acquired by the calculation processing of S2 does not take into account the rotation of the eyeglass frame F, and when the eyeglass frame F is rotating, the astigmatic axis of the actual eyeglass lens There is a deviation from the angle. Therefore, the astigmatic axis angle in which the rotation of the eyeglass frame F is corrected is acquired using the inter-pupil distance PD1 corrected based on the horizontal displacement amount and the vertical displacement amounts ΔZ1 and ΔZ2.

  For example, as the rotation information of the eyeglass frame F, the rotation angle of the eyeglass frame F (the angle indicating the amount of rotation of the eyeglass frame F) θ, and the rotation direction (rotation direction information) of the eyeglass frame F may be mentioned. For example, the rotation angle θ of the eyeglass frame F can be calculated by the following equation (2).

In the present embodiment, the rotational direction can be acquired from the acquired rotational angle θ of the eyeglass frame F. For example, in the present embodiment, when the rotation angle θ of the eyeglass frame F is a positive value (eg, θ = 45 ° or the like), it indicates that the eyeglass frame F rotates in the counterclockwise direction R1. It is configured (see FIG. 7). In the present embodiment, when the rotation angle θ of the eyeglass frame F is a negative value (for example, θ = −45 ° or the like), it indicates that the eyeglass frame F rotates in the clockwise direction R2. The control unit 40 configured as above performs correction processing of the astigmatic axis angle using the rotation information of the eyeglass frame F. For example, the control unit 40 adds or subtracts the rotation angle θ of the eyeglass frame F with respect to the astigmatic axis angles of the left and right eyeglass lenses, respectively (adding process or subtraction process). Correct astigmatic axis angle. In the present embodiment, the determination as to whether to execute the process of adding the rotation angle θ of the eyeglass frame F or to execute the process of pulling it is performed when the rotation angle θ of the eyeglass frame F is a plus value or a minus value. It can be set depending on which one. For example, when the rotation angle θ of the eyeglass frame F is a positive value, the control unit 40 performs processing of subtracting the angle θ from the astigmatic axis angle. Further, for example, when the rotation angle θ of the eyeglass frame F is a negative value, the control unit 40 performs a process of adding the angle θ to the astigmatic axis angle. For example, in the case shown in FIG. 7, the control unit 40 performs processing of subtracting the angle θ with respect to the astigmatic axis angles of the left and right eyeglass lenses. Thus, the control unit 40 corrects the astigmatic axis angle based on the inter-pupil distance PD1 corrected based on the horizontal displacement amount and the vertical displacement amounts ΔZ1 and ΔZ2.

  As described above, in the lens meter 1 including the pair of left and right measurement optical systems, the amount of displacement is calculated, and the optical characteristics are corrected based on the amount of displacement to position the glasses relative to the placement unit 4 The optical characteristics with high accuracy can be obtained without adjusting () finely. That is, the time and effort required for the measurement of the spectacle lens are reduced. In addition, it is possible to calculate the optical characteristics of the spectacle lens accurately and easily, without the need for a complicated configuration for adjusting the position of the glasses and complicated control.

  Furthermore, since the left and right eyeglass lenses can be measured simultaneously by the left and right pair of measurement optical systems, the positions (position information) of the optical centers of the left and right eyeglass lenses with respect to the optical axis L1 of the left and right pair of measurement optical systems can be obtained. Vertical deviation amount in the vertical direction can be calculated. By this, it is possible to calculate an optical characteristic in which the influence of the rotation of the spectacle frame when the spectacles are placed on the pair of left and right placement parts is corrected (considered).

  Furthermore, even in a lens meter in which the distance between the optical axes L1 of the pair of left and right measurement optical systems is fixed at a predetermined distance by correcting the optical characteristics of the spectacle lens based on the amount of horizontal displacement. Optical characteristics can be calculated well.

  In the present embodiment, although the case where the astigmatic axis angle and the interpupillary distance are corrected based on the vertical displacement amount has been described as an example, the present invention is not limited to this. For example, at least one of the astigmatic axis angle and the inter-pupil distance may be corrected based on the vertical displacement amount.

  In the present embodiment, the configuration in which the correction process is performed based on the horizontal displacement amount and the vertical displacement amount has been described as an example, but the present invention is not limited to this. The correction processing may be performed based on at least one of the horizontal displacement amount and the vertical displacement amount. For example, in the case where the correction processing is performed only by the horizontal displacement amount, only the inter-pupil distance (the distance between the optical axes L1 of the measurement optical system) PD may be corrected. In this case, even if the interpupillary distance of the eyeglass frame is measured using a lens meter in which the distance between the optical axes L1 of the pair of measurement optical systems is set in advance, the interpupillary distance should be accurately determined. Can. In particular, when the glasses are placed on the placement unit without being rotated, the inter-pupil distance can be accurately obtained. Also, for example, when performing correction processing using only the vertical displacement amount, the distance between the optical axes L1 of the left and right measurement optical systems (fixed distance between pupils) PD and the vertical displacement amount. The optical characteristics may be corrected. In this case, it is possible to suppress the decrease in the accuracy of the optical characteristics caused by the rotation (tilting) of the eyeglass frame.

  In the present embodiment, although the case where the pair of left and right measurement optical systems have the same configuration is described as an example, the present invention is not limited to this. A part of the members of the measurement optical system may be shared by the pair of measurement optical systems. For example, the structure which combines a light source, a light receiving sensor, etc. is mentioned. When the light source is also used, there is a configuration in which the light flux emitted from the light source is split by a beam splitter or the like and emitted to each of the measurement optical systems. In the case where the light receiving sensor is also used, there is a configuration in which the timings of light emitted from the light sources of the pair of measurement optical systems are shifted, and the light flux is received at different timings.

  In addition, the technique of this indication is not limited to when applying in the lens meter 1 in this embodiment. The technique of the present disclosure can be applied to any device that includes a pair of measurement optical systems and that uses this measurement optical system to measure the optical characteristics of the left and right spectacle lenses. For example, to the measurement optical system of the lens meter in the present embodiment, a measurement optical system that measures optical characteristics by a phase difference method can be applied. In addition, for example, a measurement optical system that measures optical characteristics over a wide range of a spectacle lens can be applied to the measurement optical system of the lens meter in the present embodiment (for example, JP-A-2002-534665) See the official gazette).

  The technology of the present disclosure is not limited to the device described in the present embodiment. For example, calculation software (program) that performs the functions of the above-described embodiment is supplied to a system or apparatus via a network or various storage media. Then, a computer (for example, a CPU or the like) of a system or an apparatus can read and execute a program.

Reference Signs List 1 lens meter 2 display 4 placement unit 8 operation unit 10 L measurement optical system 11 light source 14 grit plate 15 light receiving sensor 40 control unit 42 memory LE eyeglass lens

Claims (4)

A pair of left and right measurement optical systems for respectively measuring the left and right eyeglass lenses mounted on the left and right pair of mounting portions provided so that the left and right eyeglass lenses of the glasses can be respectively mounted;
Calculating means for calculating optical characteristics of the left and right eyeglass lenses based on the measurement results of the left and right eyeglass lenses measured by the measurement optical system;
A lens meter comprising
The calculation means calculates an amount of deviation of the optical center of the spectacle lens with respect to the optical axis of the measurement optical system based on the optical characteristics of the left and right eyeglass lenses, and includes in the optical characteristics based on the deviation amount. A lens meter characterized by correcting the astigmatic axis angle . In the lens meter of claim 1,
A lens meter characterized in that the displacement amount calculated by the calculation means includes a vertical displacement amount in a direction perpendicular to the optical center of the spectacle lens with respect to the optical axis of the measurement optical system. A pair of left and right measurement optical systems respectively measuring optical characteristics of the left and right eyeglass lenses mounted on the left and right pair of mounting portions provided so that the left and right eyeglass lenses of the glasses can be respectively mounted;
Calculating means for calculating optical characteristics based on the measurement result measured by the measurement optical system;
A lens meter comprising
The computing means is based on the amount of prism and deflection direction information included in the optical characteristic, the amount of horizontal deflection in the horizontal direction and vertical deflection in the vertical direction of the optical center of the spectacle lens with respect to the optical axis of the measurement optical system. Calculating the amount, correcting the inter-pupil distance based on the horizontal displacement amount, and calculating the optical based on the inter-pupil distance corrected based on the horizontal displacement amount and the vertical displacement amount The astigmatic axis angle included in the characteristic is corrected, and the correction is made based on the horizontal displacement amount based on the inter-pupil distance corrected based on the horizontal displacement amount and the vertical displacement amount. A lens meter characterized by re-compensating an inter-pupil distance. An arithmetic program that is executed by an arithmetic device that calculates optical characteristics of an eyeglass lens based on the measurement result of the eyeglass lens measured by a lens meter,
Optical characteristics from a lens meter including a pair of left and right measurement optical systems for measuring the optical characteristics of the left and right spectacle lenses mounted on the left and right pair of mounting portions provided so as to be able to mount the left and right spectacle lenses respectively Acquisition step to acquire
A correction step of calculating an amount of deviation of the optical center of the spectacle lens with respect to the optical axis of the measurement optical system based on the optical characteristic, and correcting the optical characteristic based on the amount of deviation;
An arithmetic program characterized by causing the arithmetic unit to execute the program.