JP2019060850A - Lens characteristic measuring device and method for actuating lens characteristic measuring device - Google Patents

Abstract

To provide a lens characteristic measuring device and a method for actuating the lens characteristic measuring device with which it is possible to both improve sensitivity and secure a frequency measurement range.SOLUTION: A lens characteristic measuring device comprises: a scanning optical system for scanning a surface of a test lens with linear beams of light; a screen to which the linear beam of light having passed through the test lens is projected; a setting unit for setting a plurality of optical distances of the linear beams of light between the test lens and the screen; a photographing optical system, provided on an opposite side of the screen to the scanning optical system, for photographing the screen while scanning with the linear beams of light is being carried out by the scanning optical system; and a control unit for causing the scanning of the linear beams of light with a common pattern by the scanning optical system and the photographing of the screen by the photographing optical system to be executed for each of the optical distances set by the setting unit.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a lens characteristic measuring apparatus for measuring an optical characteristic of a lens to be measured and an operation method of the lens characteristic measuring apparatus.

  There is known a lens characteristic measurement device that measures the optical characteristics of a spectacle lens (test lens). The lens characteristic measurement apparatus measures the illumination optical system that irradiates the test lens with the measurement light as a parallel light beam, the Hartmann plate on which the measurement light transmitted through the test lens is incident, and the many pinholes of the Hartmann plate A screen on which light is projected, and an imaging optical system that captures a point image of a large number of measurement beams projected on the screen are provided (see Patent Document 1).

  In this lens characteristic measurement apparatus, when the lens to be examined is not set, the distance between the point images projected onto the screen is equal to the distance between the pinholes of the Hartmann plate. When the lens to be measured is a convex lens, the distance between the point images projected onto the screen is smaller than the distance between the pinholes of the Hartmann plate. Furthermore, when the lens to be measured is a concave lens, the distance between the point images projected onto the screen is wider than the distance between the pinholes of the Hartmann plate. Therefore, in the lens characteristic measurement apparatus, the optical characteristic of the lens to be measured is obtained by analyzing the photographed image of the screen photographed by the photographing optical system and acquiring the position of each point image projected on the screen.

  In such a lens characteristic measurement apparatus, the longer the distance from the test lens to the screen, the larger the amount of movement of the point image on the screen when the refractive power of the test lens changes, so the lens characteristic measurement apparatus Improves the sensitivity (resolution) of However, when the distance from the test lens to the screen is increased, two different Hartmann plate plates are used to measure the optical characteristics of the test lens of positive intensity number (short focal length) by the lens characteristic measurement device. Two point images on the screen respectively corresponding to the pinholes overlap or their positional relationship is reversed. For this reason, the exact position of each point image can not be detected.

  Therefore, Patent Document 1 discloses a lens characteristic measurement device capable of changing the distance between a Hartmann plate and a screen. In this lens characteristic measurement apparatus, in the case of measuring the optical characteristics of the test lens of positive weak power or the test lens of negative power, the distance is increased and the optical characteristics of the test lens of positive intensity number are In the case of measurement, the above distance is shortened to prevent the occurrence of the overlapping of the point images and the reversal of the positional relationship.

  Further, Patent Document 2 discloses a lens characteristic measurement device capable of changing the distance between the test lens and the screen although the positional relationship between the Hartmann plate and the test lens is opposite to that of Patent Document 1. There is. In this lens characteristic measurement device, the distance between the lens to be measured and the screen is changed to two different distances, and each point image projected onto the screen at each distance is photographed by a photographing optical system and obtained by photographing. The optical characteristic of the lens to be measured is obtained based on the photographed image for each distance.

JP 2005-274473 A Unexamined-Japanese-Patent No. 2006-275971

  FIG. 23 is for explaining the relationship between the type of the subject lens 200 and the projection position of the point image 203 of the two measurement lights projected onto the screen 202 through the two different pinholes of the Hartmann plate 201. FIG. As shown by the code UA in FIG. 23, when the lens 200 to be measured is a positive weak power lens, the two point images 203 projected on the screen 202 are separated. Further, as indicated by the symbol UB in FIG. 23, when the lens 200 to be measured is a lens with a positive intensity number, the two point images 203 projected on the screen 202 overlap, and therefore these two point images It is difficult to detect 203 separately. Further, as shown by the symbol UB in FIG. 23, when the lens 200 to be measured is a lens with a positive intensity number, the measurement light transmitted through each of the two pinholes intersects in front of the screen. The positional relationship between the two point images 203 is inverted.

  In the lens characteristic measurement device described in Patent Document 1, when the lens 200 to be measured is a lens of positive weak power or a lens of negative power, the distance between the Hartmann plate 201 and the screen 202 can be increased. . However, in this lens characteristic measurement device, when the lens 200 to be measured is a lens with a positive intensity number indicated by the symbols UB and UC, the distance between the Hartmann plate 201 and the screen 202 is set short. The distance from the test lens 200 to the screen 202 becomes short. Therefore, the sensitivity (resolution) of the lens characteristic measurement device can not be improved. Therefore, with the lens characteristic measurement device described in Patent Document 1, it is not possible to achieve both the improvement in sensitivity and the securing of the measurement range (dynamic range) of the dioptric power.

  With regard to the lens characteristic measurement device described in Patent Document 2 as well, attention is not focused on achieving compatibility between sensitivity improvement and securing of the measurement range of the power as a technical problem, and a configuration for achieving this compatibility is also disclosed or suggested. It has not been.

  The present invention has been made in view of such circumstances, and it is an object of the present invention to provide a lens characteristic measuring device and an operating method of the lens characteristic measuring device capable of achieving both improvement in sensitivity and securing of a measurement range of power. .

  A lens characteristic measuring device for achieving the object of the present invention comprises a scanning optical system for scanning a surface of a lens to be measured with a linear light beam, a screen on which a linear light beam transmitted through the lens to be measured is projected, A setting unit configured to set a plurality of optical distances of linear light flux between the lens and the screen, and provided on the opposite side to the scanning optical system with respect to the screen, scanning of the linear light flux is executed by the scanning optical system During this time, scanning of the linear light beam with a common scanning pattern by the scanning optical system, photographing of the screen by the photographing optical system, and the photographing optical system for photographing the screen and the optical distance set by the setting unit And a control unit for performing

  According to this lens characteristic measuring apparatus, the linear light beam is scanned on the surface of the lens to be measured without using the Hartmann plate, and the linear light beam transmitted through the lens to be measured is projected on the screen at a plurality of optical distances. Since the screen is photographed every optical distance, it is possible to separate and detect the linear luminous flux transmitted through different scanning positions on the surface of the lens to be measured regardless of the type of the lens to be measured.

  In a lens characteristic measuring apparatus according to another aspect of the present invention, a position at which a photographed image of a screen photographed at every optical distance is analyzed by a photographing optical system to acquire a projection position of a linear light beam projected on the screen A position acquisition unit, which is an acquisition unit and acquires, for each scanning position on the surface of the test lens by the linear light beam, the projection position of each of the linear light beams transmitted through the same scanning position; The optical characteristic acquisition unit acquires an optical characteristic of the lens to be measured based on the plurality of optical distances set by the setting unit and the acquisition result of the projection position by the position acquisition unit. Thereby, the optical characteristics of the test lens can be measured regardless of the type of the test lens.

  In the lens characteristic measuring apparatus according to another aspect of the present invention, the setting unit holds the screen movably in the optical axis direction of the photographing optical system and positions the screen at optical axis positions corresponding to a plurality of optical distances. The control unit is a moving unit for moving, and executes the scanning of the linear light beam by the scanning optical system and the photographing of the screen by the photographing optical system each time the screen is positioned at the position in the optical axis direction by the moving unit. . Thereby, a plurality of optical distances can be set.

  In the lens characteristic measurement device according to another aspect of the present invention, the setting unit moves the imaging optical system integrally with the screen. By this, it is possible to make common the photographing conditions (photographing magnification and the like) of the screen for each optical distance by the photographing optical system.

  In the lens characteristic measurement apparatus according to another aspect of the present invention, the setting unit is configured to divide the linear light flux transmitted through the lens to be measured into a plurality of optical paths, and the first light division unit for each optical path. The plurality of screens are provided at different positions and on which the linear light beams are respectively projected from the first light splitting unit, the photographing optical system is provided individually for each screen, and the control unit is The single scanning of the linear light beam by the scanning optical system and the simultaneous photographing of the screen by the photographing optical system provided for each screen are performed. Thereby, a plurality of optical distances can be set, and the measurement can be completed in a short time.

  In the lens characteristic measurement device according to another aspect of the present invention, the setting unit inserts and removes the optical member having the light transmission property with respect to the light path of the linear light beam between the lens to be measured and the screen. The control unit performs scanning of the linear light beam by the scanning optical system and the photographing optical system in the case where the optical member is arranged on the optical path by the insertion and removal unit and in the case where the optical member is arranged outside the optical path Run the screen shooting by and. Thereby, a plurality of optical distances can be set, and the lens characteristics measuring apparatus can be miniaturized.

  In the lens characteristic measuring apparatus according to another aspect of the present invention, the number of point images for controlling the scanning optical system to adjust the number of point images by linear light flux included in the photographed image of the screen photographed by the photographing optical system It has an adjustment unit. As a result, the measurement of the optical characteristics can be completed in a short time by increasing the number of point images due to the linear light flux included in the captured image on the screen, and conversely, the linear light flux included in the captured image on the screen By reducing the number of point images, it is possible to prevent the occurrence of overlapping of the point images due to the linear light beams projected onto the screen and the reversal of the positional relationship.

  A lens characteristic measurement apparatus according to another aspect of the present invention includes a scan setting unit configured to set at least one of a linear light flux scan range, a linear light flux scan pitch, and a type of scan pattern, The scan of the linear light beam is performed according to the setting in the scan setting unit. Thereby, the scanning range and the scanning pitch of the linear light flux can be arbitrarily changed according to the type of the spectacle lens.

  In the lens characteristic measuring apparatus according to another aspect of the present invention, an optical system in which the control unit controls the scanning angle of the linear light beam emitted from the scanning optical system to scan the surface of the test lens with the linear light beam. A second light splitting unit provided with a control unit and provided along the light path of the linear light flux from the scanning optical system to the surface of the lens to be measured and which splits part of the linear light flux, and a second light splitting unit A measured value acquiring unit for acquiring a measured value of a scanning angle based on a light receiving optical system for receiving the divided linear light beam, a light receiving position of the linear light beam received by the light receiving optical system, and a previously acquired scanning angle And a correction unit that corrects the control of the scanning angle by the optical system control unit based on the comparison result of the instruction value and the measurement value acquired by the measurement value acquisition unit. This improves the measurement accuracy of the optical characteristics of the lens to be measured and the reproducibility of the mapping image of the optical characteristics.

  In order to achieve the object of the present invention, in the method of operating a lens characteristic measurement apparatus, the scanning optical system scans the surface of the lens to be inspected with a linear light beam, the setting unit includes the lens to be detected and the lens to be measured Setting a plurality of optical distances of the linear luminous flux to the screen on which the linear luminous flux transmitted through is projected, and a photographing optical system provided on the opposite side to the scanning optical system with respect to the screen, While scanning of the linear light beam is being performed by the scanning optical system, the step of photographing the screen, and the control unit in a common scanning pattern by the scanning optical system for each optical distance set by the setting unit And performing scanning of the linear light beam and photographing of the screen by the photographing optical system.

  In the method of operating a lens characteristic measuring apparatus according to another aspect of the present invention, the control unit controls the scanning angle of the linear light beam emitted from the scanning optical system to scan the surface of the lens to be measured with the linear light beam. An optical system control unit for dividing the linear light flux from the scanning optical system to the surface of the test lens along the light path of the linear light flux and the light dividing step. And a measured value acquiring step of acquiring a measured value of a scanning angle based on a light receiving step of receiving the linear light flux, a light receiving position of the linear light flux received in the light receiving step, and an indication value of a scanning angle acquired in advance. And a correction step of correcting the control of the scanning angle by the optical system control unit based on the result of comparing the measurement value acquired in the measurement value acquisition step with the measurement value.

  The present invention is compatible with sensitivity improvement and securing of the measurement range of frequency.

It is an appearance perspective view of a lens characteristic measuring device of a 1st embodiment. It is a perspective view of a set part. It is a top view of a set part. It is the schematic which showed one of a pair of "scanning optical system, a screen, and imaging optical system" used for the measurement of the optical characteristic of a spectacle lens on either side as a representative example. It is an explanatory view for explaining integral movement of a screen and photography optical system by a move part. It is the perspective view which showed only the eyeglass lens in 5B of codes | symbols of FIG. 5, and a screen. It is a functional block diagram of a general control part of a 1st embodiment. It is an explanatory view of position information which a position acquisition part acquires based on image information and this image information. It is explanatory drawing for demonstrating acquisition of the optical center position (optical axis) of the spectacles lens by an optical characteristic acquisition part, and acquisition of a back focus. It is a flowchart which shows the flow of a measurement process of the optical characteristic of the spectacle lens of the right and left of the spectacles frame by the lens characteristic measuring apparatus of 1st Embodiment. It is the schematic which showed the structure of the principal part of the lens characteristic measuring apparatus of 2nd Embodiment. It is a functional block diagram of a general control part of a 2nd embodiment. It is a flowchart which shows the flow of a measurement process of the optical characteristic of the spectacle lens of the right and left of the spectacles frame by the lens characteristic measuring apparatus of 2nd Embodiment. It is the schematic which showed the structure of the principal part of the lens characteristic measuring apparatus of 3rd Embodiment. It is a functional block diagram of a general control part of a 3rd embodiment. It is a flowchart which shows the flow of a measurement process of the optical characteristic of the spectacle lens of the right and left of the spectacles frame by the lens characteristic measuring apparatus of 3rd Embodiment. It is a functional block diagram of the integrated control part of the lens characteristic measuring device of a 4th embodiment. It is a schematic diagram of a lens characteristic measuring device of a comparative example provided with a Hartmann plate and a screen, and is an explanatory view for explaining an effect obtained by setting of a scanning range and a scanning pitch of a linear light flux by a scanning optical system. It is explanatory drawing for demonstrating adjustment of the point image number of the point image by the linear light beam contained in a picked-up image. It is the schematic of the scanning optical system of the lens characteristic measuring device of 5th Embodiment, a screen, and imaging | photography optical system. It is a functional block diagram of the integrated control part of the lens characteristic measuring apparatus of 5th Embodiment. It is a flowchart which shows the flow of correction | amendment control of the rocking angle of each galvano mirror by the lens characteristic measuring apparatus of 5th Embodiment. It is explanatory drawing for demonstrating the relationship between the kind of to-be-tested lens, and the projection position of the point image by two measurement lights projected on a screen through two mutually different pinholes of a Hartmann plate.

Configuration of Lens Characteristic Measurement Device According to First Embodiment
FIG. 1 is an external perspective view of the lens characteristic measuring apparatus 10 according to the first embodiment. The lens characteristic measurement device 10 measures the optical characteristics of the left and right spectacle lenses 102 (corresponding to the subject lens of the present invention) held by the spectacle frame 101 without replacing the spectacle frame 101. The optical characteristics include, for example, back focus Bf (see FIG. 9), spherical power, cylindrical power (astigmatic power), cylindrical axis angle (astigmatic axis angle), and prism value (prism power and prism base direction). It is.

  The eyeglass frame 101 has left and right rims 104 (also referred to as lens frames) for holding the left and right eyeglass lenses 102, bridge portions 105 for connecting the left and right rims 104, and nose pads provided on the left and right rims 104 respectively. A portion 106 and a temple 107;

  The lens characteristic measurement device 10 has an upper housing 11 and a lower housing 12 provided at intervals in the vertical direction in the figure, and a back housing provided on the back side of the upper housing 11 and the lower housing 12. And a body 13.

  The front side of the upper housing 11 is provided with a monitor 15 for displaying a measurement result of the optical characteristic of the spectacle lens 102 and the like, and various operation switches 16 for performing various operations of the lens characteristic measuring apparatus 10. Further, a pair of linear light fluxes 46 (see FIG. 4), which are measurement light, are respectively emitted to the left and right spectacle lenses 102 of the spectacle frame 101 supported by the setting unit 20 described later inside the upper housing 11. The scanning optical system 35 (see FIG. 4) is provided. A part of the pair of scanning optical systems 35 is provided inside the back case 13.

  The set portion 20 is provided on the upper surface of the lower housing 12 at the lower position of the above-described upper housing 11 (the irradiation position of the linear luminous flux 46 (see FIG. 4) from the upper housing 11). An eyeglass frame 101 to be measured of optical characteristics is set and supported by the setting unit 20.

  Inside the lower housing 12 and the back housing 13, as shown in FIG. 4 described later, linear light fluxes 46 respectively transmitted through the left and right eyeglass lenses 102 of the eyeglass frame 101 set in the set portion 20 are projected And a pair of imaging optical systems 37 for imaging the pair of screens 36 respectively.

  FIG. 2 is a perspective view of the setting unit 20. FIG. FIG. 3 is a top view of the setting unit 20. FIG. As shown in FIGS. 2 and 3, in the set portion 20, a pair of holding members 21 and 22 are disposed at an interval in the front-rear direction of the lens characteristic measuring apparatus 10. The holding members 21 and 22 are displaceable in a direction in which they approach each other and in a direction away from each other, and hold the eyeglass frame 101 set between them. Thus, the vertical direction of the eyeglass frame 101 can be aligned with the front-rear direction of the lens characteristic measurement apparatus 10, and the surface of the eyeglass lens 102 can be opposed to the upper housing 11. The back surface of the spectacle lens 102 is a surface facing the face of the user (wearer) of the spectacle frame 101, and the surface on the opposite side is the surface of the spectacle lens 102.

  Further, in the set portion 20, a pair of support pins 23 for supporting the back side of the left and right eyeglass lenses 102 of the eyeglass frame 101 are provided upright. Each support pin 23 is disposed at a substantially middle point in the front-rear direction of the holding members 21 and 22. The holding members 21 and 22 position the eyeglass frame 101 such that the frame midpoint of the eyeglass frame 101 is disposed on the line connecting the support pins 23. As a result, the left and right spectacle lenses 102 can be aligned with the measurement position of the lens characteristic measurement device 10. In addition, the code | symbol OA in a figure is optical axis OA (optical center position) of the spectacle lens 102 on either side.

  On both left and right sides of the holding members 21 and 22, frame supports 25 and 26 are provided which abut on part of the eyeglass frame 101 and maintain the eyeglass frame 101 in a stable posture.

  In addition, a nose pad support member 24 is disposed between the sandwiching members 21 and 22 at a substantially central portion in the left-right direction, with a surface facing the sandwiching member 21 on the front side formed as a cylindrical peripheral surface. The nose pad support member 24 is slidable rearward from a substantially central position in the front-rear direction, and is urged forward by a spring or the like (not shown). The nose pad support member 24 abuts on the nose pad portion 106 of the eyeglass frame 101 when the eyeglass frame 101 is held from the front and back by the holding members 21 and 22.

  The back housing 13 is provided with a pair of rotation shafts 28 that rotatably support the pair of arms 27 at a position on the upper side of the set portion 20. A pressure pin 29 is provided at the tip of each arm 27. When each arm 27 is rotated about the rotation axis 28, each pressing pin 29 of each arm 27 abuts on the surface of the left and right eyeglass lenses 102 supported by the support pins 23 to make each eyeglass lens 102 Press downward. As a result, the left and right spectacle lenses 102 are pressed against the support pins 23 and fixed.

  Each support pin 23 is erected on a pair of cover glasses 30 provided at the bottom of the set portion 20. Each cover glass 30 is provided at a position where linear light beams 46 (see FIG. 4) transmitted through the left and right spectacle lenses 102 respectively supported by the support pins 23 are incident. The linear luminous flux 46 incident on each cover glass 30 is projected on a screen 36 (see FIG. 4) provided on the lower side of the cover glass 30.

[Scanning optical system, screen, and photographing optical system]
FIG. 4 is a schematic view showing, as a representative example, one of a pair of “scanning optical system 35, screen 36, and photographing optical system 37” used to measure the optical characteristics of the left and right eyeglass lenses 102.

  As shown in FIG. 4, the scanning optical system 35 includes a light source 40, a lens 41, a scanner 42, a mirror 43 and a collimator 44.

  The light source 40 is, for example, a laser light source, a super luminescent diode (SLD) light source, a light emitting diode (LED) light source or the like, and linear light flux 46 (linear light, line) as measurement light (inspection light) in the visible wavelength range. Emits a light beam, a scanning light beam, or a beam). The linear light flux 46 is irradiated to the spectacle lens 102 through the lens 41, the scanner 42, the mirror 43 and the collimator 44.

  The scanner 42 is, for example, a galvano scanner, and has a structure in which two galvano mirrors 42A (deflection mirrors) swinging around a swinging axis orthogonal to each other are arranged in proximity. The galvano mirror 42 </ b> A on the downstream side in the traveling direction of the linear light beam 46 is disposed at the focal position of the collimator 44.

  One of the galvano mirrors 42A scans the linear light beam 46 in the first direction x by adjusting its swing angle θ in multiple steps (stepless). The other of the galvano mirrors 42A scans the linear light beam 46 in a second direction y orthogonal to the first direction x by adjusting the swing angle φ in multiple steps (stepless). Thereby, the scanner 42 can scan the linear light flux 46 in a two-dimensional direction at high speed while emitting the linear light flux 46 toward the mirror 43.

  The scanner 42 is not limited to the galvano scanner, and various scanners capable of high-speed scanning of the linear luminous flux 46 in a two-dimensional direction, such as a resonant scanner (resonant scanner) and a MEMS (Micro Electro Mechanical Systems) scanner. You may use.

  The mirror 43 reflects the linear light beam 46 incident from the scanner 42 toward the collimator 44. The collimator 44 converts the linear light beam 46 incident from the mirror 43 into parallel light parallel to the photographing optical axis OB of the photographing optical system 37 and emits the light toward the spectacle lens 102 supported on the support pin 23. Thereby, the linear luminous flux 46 is irradiated on the surface side of the spectacle lens 102.

  The scanner 42 scans the linear light beam 46 in the two-dimensional direction (first direction x and second direction y), whereby the linear light beam 46 is two-dimensionally (first direction X and the second) on the surface of the spectacle lens 102. It is scanned in two directions Y). In the present embodiment, the first direction x and the first direction X are the left and right direction of the lens characteristic measuring apparatus 10, the second direction y is the vertical direction of the lens characteristic measuring apparatus 10, and the second direction Y is the lens characteristic It is the front-back direction of the measuring device 10. By scanning the linear luminous flux 46 on the surface of the spectacle lens 102, the linear luminous flux 46 is sequentially irradiated to a plurality of scanning positions P on the surface of the spectacle lens 102. The linear light beams 46 emitted to the respective scanning positions P of the spectacle lens 102 are transmitted through the cover glass 30 and projected on the screen 36.

  In the present embodiment, the linear light flux is intermittently (intermittently) from the light source 40 in conjunction with the displacement of the scanning position P where the linear light flux 46 is incident, that is, the displacement of at least one of the two Galvano mirrors 42A. Emit 46. In this case, the respective scanning positions P on the surface of the spectacle lens 102 are separated at a constant pitch interval.

  Instead of intermittently emitting the linear luminous flux 46 from the light source 40, the linear luminous flux 46 may be emitted continuously from the light source 40. In this case, since the linear light beam 46 is scanned like a single stroke on the surface of the spectacle lens 102, each scanning position P on the surface of the spectacle lens 102 is continuous.

  The screen 36 is provided on the lower side of the cover glass 30. The screen 36 is, for example, a sanded glass substrate or the like, and has diffuse permeability. A linear light beam 46 transmitted through the spectacle lens 102 and the cover glass 30 is projected on the screen 36. Then, the scanner 42 scans the linear light beam 46 in a two-dimensional direction, and is projected on the screen 36 in response to the linear light beam 46 being sequentially irradiated to a plurality of scanning positions P on the surface of the spectacle lens 102 The position of the linear luminous flux 46 also changes.

  The photographing optical system 37 is provided on the side opposite to the scanning optical system 35 with respect to the screen 36, that is, on the lower side of the screen 36, and photographs the screen 36 on which the linear light beam 46 is projected from the lower surface side. . The photographing optical system 37 includes a field lens 48 and a camera 50 from the upper side to the lower side. The field lens 48 causes the image of the screen 36 onto which the linear light beam 46 is projected to enter the camera 50.

  The camera 50 includes an imaging lens 50A and an imaging device 50B of a charge coupled device (CCD) type or a complementary metal oxide semiconductor (CMOS) type. The imaging lens 50A causes the image of the screen 36 incident through the field lens 48 to be incident on the imaging surface of the imaging element 50B.

  The imaging device 50B continuously captures an image of the screen 36 incident through the imaging lens 50A while scanning of the linear light beam 46 by the scanning optical system 35 is performed. As a result, the photographed image 52 of the screen 36 continuously photographed by the camera 50 is output from the camera 50 to the general control unit 58 described later.

  The moving unit 54 corresponds to the setting unit of the present invention, and can move the screen 36 and the photographing optical system 37 along the photographing optical axis OB of the photographing optical system 37 as shown by the arrow M in the figure. , And moves the screen 36 and the photographing optical system 37 integrally along the photographing optical axis OB.

  FIG. 5 is an explanatory view for explaining the integral movement of the screen 36 and the photographing optical system 37 by the moving unit 54. As shown in FIG. As shown in FIG. 5, in the moving unit 54, the position in the optical axis direction of the screen 36 along the photographing optical axis OB is indicated by a first optical axis position L1 indicated by reference numeral 5A and a second optical axis direction indicated by reference numeral 5B. The screen 36 and the imaging optical system 37 are integrally moved so as to be displaced to L2. At this time, the moving unit 54 can accurately position the screen 36 at the predetermined first optical axis direction L1 and the second optical axis L2, respectively, by counting the number of pulses of a pulse motor (not shown). . In addition, you may position the screen 36 using a position detection sensor not shown instead of counting the pulse number of a pulse motor.

  FIG. 6 is a perspective view showing only the spectacle lens 102 and the screen 36 in the reference numeral 5B of FIG. As shown in FIG. 6 and FIG. 5 described above, the spectacle lens 102 and the screen 36 are positioned by positioning the screen 36 and the photographing optical system 37 at the first optical axis direction position L1 and the second optical axis direction position L2. And the second optical distance LO2 can be changed between the first optical distance LO1 and the second optical distance LO2. That is, two types of optical distances can be set. As a result, the linear light beam 46 transmitted through the scanning position P on the surface of the spectacle lens 102 can be projected onto the screen 36 set to the first optical distance LO1 and the second optical distance LO2.

  The optical distance is the product of the refractive index of the medium existing between the spectacle lens 102 and the screen 36 corresponding to the wavelength of the linear light beam 46 and the actual distance between the spectacle lens 102 and the screen 36. is there. And in this embodiment, the 1st optical distance LO1 and the 2nd optical distance LO2 are switched by changing real distance.

  When the linear luminous flux 46 transmitted through the same scanning position P is projected on the screen 36 respectively set to the first optical distance LO1 and the second optical distance LO2, the linear luminous flux 46 projected on each screen 36 The position coordinates of the projection positions Q1 and Q2 have a difference of ΔL in the direction parallel to the photographing optical axis OB and a difference of ΔH in the direction perpendicular to the photographing optical axis OB. Therefore, the scanning position P is transmitted by detecting the position coordinates of the projection positions Q1 and Q2 of the linear light beam 46 projected on the screen 36 corresponding to the respective optical distances LO1 and LO2 from the same scanning position P. The inclination angle of the linear light beam 46 can be detected.

  Therefore, in the present embodiment, each time the screen 36 is positioned at the first optical axis direction position L1 and the second optical axis direction position L2 under the control of the general control unit 58 described later, the scanning optical system 35 shares The scanning of the linear light beam 46 in the scanning pattern of and the continuous imaging of the screen 36 by the camera 50 while this scanning is being performed is repeatedly performed. Thereby, the inclination angle of the linear light beam 46 which each permeate | transmitted several scanning position P on the surface of the spectacles lens 102 can be detected separately.

[Overall control unit]
FIG. 7 is a functional block diagram of the integrated control unit 58 of the first embodiment provided inside the lower housing 12 or the back housing 13 of the lens characteristic measuring apparatus 10. As shown in FIG. 7, the general control unit 58 is an arithmetic circuit including various arithmetic units including, for example, a central processing unit (CPU) or a field-programmable gate array (FPGA) and a memory. The respective units of the lens characteristic measuring apparatus 10 are integrally controlled based on various operation instructions input to the unit 16. In addition, a storage unit 59 is connected to the general control unit 58.

  The integrated control unit 58 executes a software program (not shown) in the storage unit 59 to move the movement control unit 60, the optical system control unit 62, the imaging control unit 64, the image acquisition unit 66, the position acquisition unit 68, and the optical It functions as the characteristic acquisition unit 70. The optical system control unit 62 and the imaging control unit 64 function as a control unit of the present invention.

  The movement control unit 60 controls the drive of the moving unit 54. The movement control unit 60 drives the moving unit 54 in response to the input of the measurement start operation to the operation switch 16 to integrally move the screen 36 and the photographing optical system 37, thereby the first light of the screen 36 is transmitted. Positioning at axial position L1 (first optical distance LO1). Then, when the scanning of the linear light beam 46 by the scanning optical system 35 at the first optical axis direction position L1 and the continuous imaging of the screen 36 by the camera 50 are completed, the movement control unit 60 returns to the moving unit 54 again. By driving the screen 36 and the photographing optical system 37 integrally, the screen 36 is positioned at the second optical axis direction position L2 (second optical distance LO2).

  The optical system control unit 62 controls the irradiation of the linear light beam 46 by the light source 40 of the scanning optical system 35 and the driving of the scanner 42. The optical system control unit 62 sets two galvano according to a common scanning pattern of the linear light beam 46 determined in advance each time the screen 36 is positioned at the first optical axis direction position L1 and the second optical axis direction position L2. The linear light flux 46 is intermittently emitted from the light source 40 in conjunction with the displacement while displacing at least one of the mirrors 42A. Thereby, every time the screen 36 is positioned at the first optical axis direction position L1 and the second optical axis direction position L2, the linear luminous flux 46 in the two-dimensional direction with the common scanning pattern on the surface of the spectacle lens 102 The linear light beam 46 is sequentially irradiated to a plurality of common scanning positions P on the surface of the spectacle lens 102 as scanned.

  The shooting control unit 64 controls the shooting of the screen 36 by the camera 50. The imaging control unit 64 controls the camera 36 while the linear optical beam 46 is being scanned by the scanning optical system 35 in accordance with the positioning of the screen 36 at the first optical axis direction position L1 and the second optical axis direction position L2. The shooting of the screen 36 by 50 is executed.

  Specifically, every time the linear light beam 46 is intermittently emitted from the light source 40, the imaging control unit 64 displaces the scanning position P of the linear light beam 46 on the surface of the spectacle lens 102 (in each galvano mirror 42A Every time the rocking angles θ and φ are displaced, the photographing with the camera 50 is repeatedly performed. As a result, each captured image 52 captured by the camera 50 includes point images of the linear light flux 46 projected on the screen 36 one by one.

  The image acquisition unit 66 sequentially acquires the captured image 52 from the camera 50. At the same time, the image acquisition unit 66 sequentially acquires from the optical system control unit 62 and the like the rocking angles θ and φ of the galvano mirrors 42A of the scanner 42 at the time of photographing the photographed image 52. The swing angles θ and φ are information indicating the scanning position P at which the linear light beam 46 is irradiated on the surface of the spectacle lens 102. Then, the image acquiring unit 66 can distinguish the photographed images 52 acquired from the camera 50 from the rocking angles θ and φ and the optical axis direction positions L1 and L2 of the screen 36, respectively, in the storage unit 59. The image information 72 is stored.

  FIG. 8 is an explanatory diagram of the image information 72 and the position information 74 acquired by the position acquisition unit 68 based on the image information 72. As shown in FIG. As shown in FIG. 8, in the image information 72, the photographed image of the screen 36 at the first optical axis direction position L1 (first optical distance LO1) for each rocking angle θ, φ, that is, for each scanning position P. 52 and a photographed image 52 of the screen 36 at the second optical axis direction position L2 (second optical distance LO2) are stored.

  The position acquisition unit 68 acquires, from the photographed image 52, position coordinates of the projection position Q1 or the projection position Q2 of the linear light beam 46 projected on the screen 36. The position acquisition unit 68 acquires the image information 72 from the storage unit 59 when the scanning of the linear light beam 46 corresponding to each of the optical axis direction positions L1 and L2 and the photographing of the screen 36 are completed. Then, the position acquisition unit 68 analyzes each photographed image 52 in the image information 72, and based on the result of acquiring the position coordinates of the projection positions Q1 and Q2 of the linear light beam 46 projected on the screen 36, Position information 74 is generated. The position coordinates of the projection positions Q1 and Q2 are, for example, coordinates with the point intersecting the photographing optical axis OB on the screen 36 as the origin.

  In the position information 74, the projection position of the linear light beam 46 projected on the screen 36 at the first optical axis direction position L1 (first optical distance LO1) for each rocking angle θ, φ, that is, for each scanning position P. The position coordinate of Q1 and the position coordinate of the projection position Q2 of the linear light beam 46 projected on the screen 36 at the second optical axis direction position L2 (second optical distance LO2) are stored. That is, in the position information 74, the position coordinates of the projection positions Q1 and Q2 of the linear light flux 46 at the respective optical axis direction positions L1 and L2 (the respective optical distances LO1 and LO2) corresponding to the same scanning position P are It is stored for each scan position P. The position information 74 is output from the position acquisition unit 68 to the optical characteristic acquisition unit 70.

  In the present embodiment, since the screen 36 and the photographing optical system 37 are moved integrally, the distance between the screen 36 and the photographing optical system 37 is always kept constant. The imaging conditions (imaging magnification etc.) of the screen 36 are also constant. Therefore, when obtaining the projection positions Q1 and Q2 from the photographed images 52 photographed at the respective optical axis direction positions L1 and L2 (each optical distance LO1 and LO2), the difference in the photographing conditions (photographing magnification etc.) is corrected There is no need to Therefore, the projection positions Q1 and Q2 can be easily obtained.

  Referring back to FIG. 7, the optical characteristic acquisition unit 70 performs glasses based on the information on the first optical axis direction position L1 and the second optical axis direction position L2 and the position information 74 which is the position acquisition result of the position acquisition unit 68. The optical center position (optical axis OA) of the lens 102 and the optical characteristic [back focus Bf (see FIG. 9) etc.] are acquired.

  FIG. 9 is an explanatory diagram for explaining acquisition of the optical center position (optical axis OA) of the spectacle lens 102 by the optical characteristic acquisition unit 70 and acquisition of the back focus Bf. As shown in FIG. 9, the optical characteristic acquisition unit 70 is a line that transmits the scanning position P based on the position coordinates of the projection positions Q1 and Q2 of the respective optical axis direction positions L1 and L2 corresponding to the same scanning position P. A detection process for detecting the inclination angle of the flat luminous flux 46 is performed for each scanning position P. Thereby, the optical property acquiring unit 70 acquires (calculates) the optical center position of the spectacle lens 102, that is, the position of the optical axis OA from the scanning position P at which the linear light beam 46 parallel to the photographing optical axis OB is emitted. Can.

  Further, the distance ΔL between the first optical axis direction position L1 and the second optical axis direction position L2 can be obtained from an equation of ΔL = | L1-L2 |. Furthermore, since the set position of the eyeglass lens 102 is known, the distance ΔLA between the back surface of the eyeglass lens 102 and the screen 36 at the first optical axis direction L1 is also known based on the first optical axis direction L1. is there. Then, based on the position information 74, the projected position Q1 of the linear light beam 46 projected on the screen 36 at the first optical axis direction position L1 and the linear light flux 46 projected on the screen 36 at the second optical axis direction position L2. ΔH, which is the difference (the difference in the direction perpendicular to the photographing optical axis OB) with respect to the projection position Q2, can also be calculated for each scanning position P. Therefore, based on these pieces of information, the optical characteristic acquisition unit 70 can acquire (calculate) the back focus Bf of the spectacle lens 102.

  The screen 36 at the first optical axis direction position L1 can be regarded as a Hartmann plate of a conventional device when the optical characteristics of the spectacle lens 102 are obtained. Therefore, if the positional coordinates of the optical axis direction positions L1 and L2 and the projection positions Q1 and Q2 for each scanning position P are known, the optical property acquiring unit 70 calculates the same calculation method as the conventional device including the Hartmann plate. Thus, the optical center position of the spectacle lens 102 and the back focus Bf can be obtained.

  In addition, the optical property acquisition unit 70 is also configured based on the optical axis direction positions L1 and L2 and the position coordinates of the projection positions Q1 and Q2 for each scanning position P with respect to the optical characteristics of the spectacle lens 102 other than the back focus Bf. It can be obtained by the same calculation method as the device of Furthermore, the optical characteristic acquisition unit 70 can acquire a mapping image indicating the distribution of optical characteristic values in the spectacle lens 102 as in the conventional device.

  The optical characteristic acquisition unit 70 outputs and displays information on the acquired optical center position (optical axis OA) of the spectacle lens 102 and the optical characteristic (back focus Bf or the like) on the monitor 15.

[Operation of Lens Characteristic Measurement Device of First Embodiment]
FIG. 10 is a flowchart showing a flow of measurement processing (operation method of the lens characteristic measuring apparatus) of optical characteristics of the left and right spectacle lenses 102 of the spectacle frame 101 by the lens characteristic measuring apparatus 10 according to the first embodiment. Although the lens characteristic measuring apparatus 10 measures the optical characteristics of the left and right eyeglass lenses 102 simultaneously or in time series, the measurement of the optical characteristics of one of the left and right eyeglass lenses 102 will be described as an example. I do.

  The examiner sets the eyeglass frame 101 to be measured in the set portion 20, holds the eyeglass frame 101 between the holding members 21 and 22, and presses the eyeglass lens 102 supported by the support pin 23 with the holding pin 29. And fix (step S1). In addition, after the spectacles frame 101 is set in the setting unit 20, the holding members 21 and 22 and the pressing pin 29 are driven by a motor driving mechanism (not shown) or the like according to the measurement start operation by the operation switch 16. The eyeglass frame 101 may be fixed to the

  Next, when the examiner inputs a measurement start operation with the operation switch 16, the movement control unit 60 drives the moving unit 54 to integrally move the screen 36 and the photographing optical system 37 while the screen 36 is moved Positioning is performed at one optical axis direction position L1 (first optical distance LO1) (step S2).

  When the screen 36 is positioned at the first optical axis direction position L1, the optical system control unit 62 controls the scanning optical system 35 to start scanning of the linear light beam 46 with respect to the spectacle lens 102. Specifically, the optical system control unit 62 intermittently irradiates the linear light beam 46 from the light source 40 in conjunction with this displacement while displacing at least one of the two galvano mirrors 42A according to a predetermined scanning pattern. (Step S3). The linear luminous flux 46 is scanned in a two-dimensional direction in the scanning pattern described above on the surface of the spectacle lens 102, and the linear luminous flux 46 is sequentially irradiated to a plurality of scanning positions P on the surface of the spectacle lens 102.

  In addition, while the scanning of the linear light beam 46 is being performed, the imaging control unit 64 controls the camera 50 so that the scanning position P of the linear light beam 46 on the surface of the spectacle lens 102 is displaced, The photographing of the screen 36 by the camera 50 is repeatedly performed (step S4).

  Then, the photographed image 52 of the screen 36 photographed by the camera 50 is sequentially output to the image acquiring unit 66, and the image acquiring unit 66 causes the rocking angles θ and φ of the galvano mirrors 42A and the first optical axis direction position L1. The image information 72 in the storage unit 59 is sequentially stored in a state in which the image information 72 can be identified.

  When the scanning of the linear light beam 46 by the scanning optical system 35 and the photographing of the screen 36 by the camera 50 are completed, the movement control unit 60 drives the moving unit 54 again to integrate the screen 36 and the photographing optical system 37 integrally. , And the screen 36 is positioned at the second optical axis direction position L2 (second optical distance LO2) (step S5).

  When the screen 36 is positioned at the second optical axis direction position L2, the optical system control unit 62 controls the scanning optical system 35 so that the scanning pattern common to step S3 described above with respect to the surface of the spectacle lens 102 The scanning of the linear light beam 46 at step S6 is executed (step S6). As a result, the linear luminous flux 46 is sequentially irradiated to a plurality of scanning positions P common to the above-described step S3.

  Further, while the scanning of the linear light beam 46 is being performed, the photographing control unit 64 causes the camera 50 to continuously shoot the screen 36 as in the above-described step S4 (step S7). The photographed image 52 of the screen 36 photographed by the camera 50 is sequentially added to the image information 72 in a state where the rocking angles θ and φ of the galvano mirrors 42A and the second optical axis direction position L2 can be distinguished by the image acquiring unit 66. It is memorized.

  When the scanning of the linear light beam 46 by the scanning optical system 35 and the continuous shooting of the screen 36 by the camera 50 are completed, the position acquisition unit 68 determines each photographed image in the image information 72 stored in the storage unit 59. 52 is analyzed, and for each photographed image 52, position coordinates of the projection position Q1 or the projection position Q2 of the linear light beam 46 projected on the screen 36 are acquired. At this time, in the present embodiment, since the screen 36 and the photographing optical system 37 are moved integrally, the photographing conditions of the photographed image 52 at the respective optical axis direction positions L1 and L2 are common, and the projection positions Q1 and Q2 There is no need to correct differences in the imaging conditions when obtaining the position coordinates of. As a result, the position acquisition unit 68 can easily generate the position information 74 shown in FIG. 8 described above (step S8). Then, the position acquisition unit 68 outputs the position information 74 to the optical characteristic acquisition unit 70.

  The optical characteristic acquisition unit 70 receives the position information 74 from the position acquisition unit 68, and based on the position information 74 and the information on the respective optical axis direction positions L1 and L2, the optical center position of the spectacle lens 102 (optical axis OA) and optical characteristics [back focus Bf etc.] are obtained (step S9). At this time, by regarding the screen 36 positioned at the first optical axis direction position L1 as a known Hartmann plate, the optical property acquisition unit 70 uses the conventional calculation method (analysis method) to measure the optical of the spectacle lens 102. The center position and the optical properties can be determined. The measurement results of the optical characteristics and the like of the spectacle lens 102 by the optical characteristic acquisition unit 70 are output to the monitor 15 and displayed.

[Effect of lens characteristic measurement device of the first embodiment]
As described above, in the lens characteristic measuring apparatus 10 according to the first embodiment, the scanning of the linear light beam 46 and the photographing of the screen 36 are performed in parallel while changing the position of the screen 36 in the optical axis direction. The position coordinates of the projection positions Q1 and Q2 at the respective optical distances LO1 and LO2 corresponding to the same scanning position P on the surface of can be acquired for each scanning position P. Thereby, the inclination angle of the linear light beam 46 transmitted through each scanning position P of the spectacle lens 102, the optical center position (optical axis OA) of the spectacle lens 102, and the optical characteristics of the spectacle lens 102 can be obtained.

  Therefore, in the lens characteristic measuring apparatus 10 according to the first embodiment, as indicated by reference numerals UB and UC in FIG. 23 described above, the optical characteristics and the like of the spectacle lens 102 having a positive number of intensities are measured. Also, the linear light flux 46 transmitted through different scanning positions P on the surface of the spectacle lens 102 can be separated and detected. Further, in the present embodiment, in particular, the scanner 42 or the like is configured so that the point image by the linear light beam 46 projected on the screen 36 is included one by one in the photographed image 52 for each frame taken by the camera 50. I have control. Therefore, in the present embodiment, problems such as overlapping of point images and reversal of positional relationship due to the linear light beams 46 projected on the screen 36 do not occur. Further, in the present embodiment, even if the optical axis direction positions L1 and L2 are not set close to the spectacle lens 102, the optical characteristics and the like of the spectacle lens 102 with a positive number of intensities can be measured. The sensitivity (resolution) can be improved. As a result, it is possible to achieve both the improvement in sensitivity of the lens characteristic measuring apparatus 10 and the securing of the measurement range of the power.

  In the first embodiment, the screen 36 and the photographing optical system 37 are moved integrally by the moving unit 54, but only the screen 36 may be moved by the moving unit 54. In this case, the camera 50 brings the screen 36 into focus by focusing on the screen 36 each time the screen 36 is moved to the respective optical axis direction positions L1 and L2. Also, in this case, the imaging magnifications of the camera 50 at the respective optical axis direction positions L1 and L2 are stored. Thus, when the position acquisition unit 68 obtains the position coordinates of the projection positions Q1 and Q2 of the linear light beam 46, it is possible to correct the difference in imaging magnification between the optical axis direction positions L1 and L2.

Lens Characteristic Measurement Device of Second Embodiment
FIG. 11 is a schematic view showing the configuration of the main part of the lens characteristic measuring apparatus 10A of the second embodiment. The lens characteristic measuring apparatus 10 according to the first embodiment positions the screen 36 and the photographing optical system 37 at the first optical axis direction position L1 and the second optical axis direction position L2 by the moving unit 54, whereby the eyeglass lens 102 is obtained. And the screen 36 are set to the first optical distance LO1 and the second optical distance LO2. On the other hand, the lens characteristic measurement apparatus 10A of the second embodiment divides the linear light flux 46 transmitted through the spectacle lens 102 into two and makes the optical path lengths of the respective linear light flux 46 different, thereby making the first optical The setting of the distance LO1 and the second optical distance LO2 is performed.

  As shown in FIG. 11, the lens characteristic measuring apparatus 10A of the second embodiment is the same as that of the first embodiment except that the configuration for projecting and photographing the linear light beam 46 transmitted through the spectacle lens 102 etc. is different. The configuration is basically the same as that of the lens characteristic measurement device 10. For this reason, the same reference numerals are given to those that are the same in function or configuration as the first embodiment, and the description thereof will be omitted.

  The lens characteristic measuring apparatus 10A according to the second embodiment is configured to project and capture the linear light beam 46 transmitted through the spectacle lens 102 etc., the half mirror 76, two types of screens 36A and 36B, and two types of shooting And optical systems 37A and 37B. The half mirror 76 and the screens 36A and 36B function as the setting unit of the present invention.

  The half mirror 76 corresponds to the first light splitting portion of the present invention, and is provided on the lower side of the cover glass 30. The half mirror 76 divides the linear light beam 46 transmitted through the spectacle lens 102 and the cover glass 30 into a first optical path OP1 and a second optical path OP2.

  The screens 36A and 36B are the same as the screen 36 of the first embodiment. The screens 36A and 36B are individually provided in the first optical path OP1 and the second optical path OP2, respectively, and the linear light beams 46 divided by the half mirror 76 are projected respectively. At this time, the distance L1A from the half mirror 76 to the screen 36A and the distance L2A from the half mirror 76 to the screen 36B are made different. Thereby, the optical distance from the spectacle lens 102 to the screen 36A can be set to the first optical distance LO1, and the optical distance from the spectacle lens 102 to the screen 36B can be set to the second optical distance LO2.

  The photographing optical systems 37A and 37B are the same as the photographing optical system 37 of the first embodiment. The photographing optical system 37A is provided on the opposite side to the half mirror 76 with respect to the screen 36A, and photographs the screen 36A on which the linear light beam 46 is projected, and outputs a photographed image 52. The photographing optical system 37B is provided on the opposite side to the half mirror 76 with respect to the screen 36B, and photographs the screen 36B on which the linear light beam 46 is projected, and outputs a photographed image 52. At this time, since the linear light beam 46 from the spectacle lens 102 is simultaneously projected on the screens 36A and 36B via the half mirror 76, each camera 50 of the photographing optical systems 37A and 37B simultaneously photographs the screens 36A and 36B. I do.

  FIG. 12 is a functional block diagram of the general control unit 58 of the second embodiment. As shown in FIG. 12, the general control unit 58 of the second embodiment does not function as the movement control unit 60 described in the first embodiment, and the functions of the optical system control unit 62 and the imaging control unit 64 are one. It is basically the same as the general control unit 58 of the first embodiment except for the differences.

  The optical system control unit 62 according to the second embodiment adjusts the two galvano mirrors 42A of the scanner 42 according to the common scanning pattern of the linear light beam 46 determined in advance in response to the input of the measurement start operation to the operation switch 16. While displacing at least one, the linear light flux 46 is intermittently (or continuously) emitted from the light source 40 in conjunction with this displacement. Thereby, the linear light beam 46 transmitted through the plurality of scanning positions P on the surface of the spectacle lens 102 is divided by the half mirror 76 into the first optical path OP1 and the second optical path OP2, and the distance L1A from the half mirror 76 The light beam is projected onto the screen 36A which is separated and the screen 36B which is separated from the half mirror 76 by a distance L2A. As a result, the same scanning position P is transmitted to the screen 36A located at the first optical distance LO1 from the spectacle lens 102 and the screen 36B located at the second optical distance LO2 The linear luminous flux 46 is sequentially projected at each scanning position P.

  The linear light flux 46 projected on the screen 36 B is reflected (refracted) by the half mirror 76. Therefore, as shown in FIG. 11 described above, position coordinates of the projection position Q1 of the linear luminous flux 46 on the screen 36A corresponding to the same scanning position P, and linear luminous flux 46 on the screen 36B. When the position coordinates of the projection position Q2 are compared, the positive or negative of either one (X coordinate or Y coordinate) of the position coordinates (X, Y) of the two is reversed.

  While the scanning control unit 64 according to the second embodiment performs scanning of the linear light beam 46 in a common scanning pattern by the scanning optical system 35, the screen 36A of the camera 50 of each of the photographing optical systems 37A and 37B, and Execute 36B simultaneous shooting.

  The image acquiring unit 66 according to the second embodiment is configured to obtain the photographed images 52 photographed by the respective cameras 50 of the photographing optical systems 37A and 37B, with the swing angles θ and φ of the scanner 42 and the respective optical distances LO1 and LO2. And the image information 72 in the storage unit 59 in a state in which they can be identified.

  Further, as in the first embodiment, the position acquisition unit 68 of the second embodiment generates the position information 74 based on the image information 72, and the optical characteristic acquisition unit 70 of the second embodiment is an optical characteristic of the spectacle lens 102. Get etc. At this time, as described above, since one of the position coordinates (X, Y) of each of the projection position Q1 and the projection position Q2 (X coordinate or Y coordinate) is inverted, either of After the correction, the inclination angle of the linear light beam 46, the optical characteristics of the spectacle lens 102, and the like are obtained.

  FIG. 13 is a flow chart showing a flow of measurement processing of optical characteristics of the left and right eyeglass lenses 102 of the eyeglass frame 101 by the lens characteristic measurement apparatus 10A of the second embodiment. As shown in FIG. 13, in the lens characteristic measuring apparatus 10A of the second embodiment, the half mirror 76, the screens 36A and 36B, and the photographing optical systems 37A and 37B are provided to scan the linear light beam 46 once. It is possible to shift to step S8 only by performing (step S3A) and simultaneous imaging (step S4A) by each imaging optical system 37A, 37B. Therefore, the optical measurement and the like of the spectacle lens 102 are completed in a short time.

  Further, also in the lens characteristic measuring apparatus 10A of the second embodiment, the position coordinates of the projection positions Q1 and Q2 at each of the optical distances LO1 and LO2 corresponding to the same scanning position P are Since the scanning position P can be acquired, the same effect as that of the first embodiment can be obtained.

Lens Characteristic Measurement Device of Third Embodiment
FIG. 14 is a schematic view showing the configuration of the main part of the lens characteristic measuring apparatus 10B of the third embodiment. The lens characteristic measuring apparatus 10 according to the first embodiment positions the screen 36 at the first optical axis direction position L1 and the second optical axis direction position L2 by the moving unit 54, whereby the optical distance described above is The first optical distance LO1 and the second optical distance LO2 are set. On the other hand, in the lens characteristic measuring apparatus 10B of the third embodiment, the refractive index of the optical path OP3 of the linear light beam 46 between the spectacle lens 102 and the screen 36 is changed to obtain the first optical distance LO1 and the first optical distance LO1. 2 Set up with the optical distance LO2.

  As shown in FIG. 14, the lens characteristic measurement apparatus 10B of the third embodiment is the first embodiment except that it has a configuration for changing the refractive index of the optical path OP3 instead of the moving unit 54 of the first embodiment. Basically, the configuration is the same as that of the lens characteristic measuring apparatus 10 of the above. For this reason, the same reference numerals are given to those that are the same in function or configuration as the first embodiment, and the description thereof will be omitted.

  A lens characteristic measurement device 10B of the third embodiment includes a glass plate 80 corresponding to the optical member of the present invention and an insertion / extraction portion 81 instead of the moving portion 54 of the first embodiment. In addition, the glass plate 80 and the insertion / extraction part 81 function as a setting part of this invention.

  The glass plate 80 is an optical member having optical transparency that has a refractive index larger than that of air. Therefore, by inserting the glass plate 80 into the optical path OP3, the optical distance from the spectacle lens 102 to the screen 36 can be increased. Note that, instead of the glass plate 80, various light transmitting optical members having different refractive indexes from air may be inserted into the optical path OP3.

  The insertion / removal unit 81 is configured of, for example, a pulse motor and a drive transmission unit (not shown). By inserting and removing the glass plate 80 in a direction parallel to the screen 36, the insertion and removal portion 81 retracts the glass plate 80 out of the optical path OP3 as shown by a symbol WA in FIG. The glass plate 80 is inserted into the optical path of the optical path OP3 as indicated by reference numeral WB in FIG. Thereby, the optical distance between the spectacle lens 102 and the screen 36 can be changed to the first optical distance LO1 and the second optical distance LO2. As a result, as in the first embodiment, the linear luminous flux 46 transmitted through each scanning position P on the surface of the spectacle lens 102 is subjected to the screen 36 set to the first optical distance LO1, and the second optical It can be projected onto the screen 36 set to the distance LO2.

  FIG. 15 is a functional block diagram of the general control unit 58 of the third embodiment. As shown in FIG. 15, the integrated control unit 58 of the third embodiment performs the integrated control of the first embodiment except that the integrated control unit 58 functions as an insertion / removal control unit 84 instead of the movement control unit 60 of the first embodiment. Basically the same as the unit 58.

  The insertion and removal control unit 84 controls the driving of the insertion and removal unit 81. The insertion / removal control unit 84 drives the insertion / removal unit 81 according to the input of the measurement start operation to the operation switch 16 to retract the glass plate 80 from the optical path OP3 or insert it into the optical path OP3. Switch. Then, as in the first embodiment, when the scanning of the linear light beam 46 by the scanning optical system 35 and the continuous imaging of the screen 36 by the camera 50 are completed, the insertion / removal control unit 84 Driving is performed to switch the glass plate 80 to the other state of retraction from the optical path OP3 or insertion into the optical path OP3.

  FIG. 16 is a flow chart showing a flow of measurement processing of optical characteristics of the left and right eyeglass lenses 102 of the eyeglass frame 101 by the lens characteristics measuring apparatus 10B of the third embodiment. As shown in FIG. 16, in the lens characteristic measuring apparatus 10B of the third embodiment, a glass plate 80 is used instead of the movement (steps S2 and S5) of the screen 36 etc. of the first embodiment shown in FIG. Basically, the same processing as that of the first embodiment is performed except that retraction from the optical path OP3 (step S2B) and insertion of the glass plate 80 into the optical path OP3 (step S5B) are performed. The order of step S2B and step S5B may be switched.

  As described above, also in the third embodiment, as in the first embodiment, position coordinates of the projection positions Q1 and Q2 at the respective optical distances LO1 and LO2 corresponding to the same scanning position P are set for each scanning position P. You can get it. Therefore, the same effect as the first embodiment can be obtained. Further, in the third embodiment, since it is only necessary to insert and remove the glass plate 80 into the optical path OP3, the device configuration can be made smaller than in the first embodiment in which the screen 36 and the like are moved.

Lens Characteristic Measurement Device of Fourth Embodiment
FIG. 17 is a functional block diagram of the general control unit 58 of the lens characteristic measuring apparatus 10C of the fourth embodiment. The lens characteristic measuring apparatus 10C of the fourth embodiment sets the scanning range, scanning pitch, and scanning pattern of the linear light beam 46, and points of a point image by the linear light beam 46 included in the captured image 52 for one frame. It has a function of adjusting the number of images.

  As shown in FIG. 17, the lens characteristic measuring apparatus 10C of the fourth embodiment has the lens characteristics of the first embodiment except that the general control unit 58 functions as the scan setting unit 88 and the point image number adjustment unit 90. The configuration is basically the same as that of the measuring device 10. For this reason, the same reference numerals are given to those that are the same in function or configuration as the first embodiment, and the description thereof will be omitted.

  The scan setting unit 88 instructs the optical system control unit 62 to set the scan range, scan pitch, and scan pattern of the linear light beam 46 according to the scan setting operation input to the operation switch 16. In response to this command, the optical system control unit 62 controls the drive of the scanner 42 of the scanning optical system 35 to set the scanning range, scanning pitch, and scanning pattern of the linear light beam 46.

<Setting of scan range and scan pitch>
FIG. 18 is a schematic view of a lens characteristic measuring apparatus 300 according to a comparative example provided with the Hartmann plate 201 and the screen 202, obtained by setting (changing) the scanning range and scanning pitch of the linear luminous flux 46 by the scanning optical system 35. It is an explanatory view for explaining the effect obtained. 18 indicates an example of performing an optical measurement of the spectacle lens 102A having a power of 0 D, a code RB of FIG. 18 indicates an example of performing an optical measurement of a spectacle lens 102B having a positive power, and FIG. Shows an example of performing optical measurement of the spectacle lens 102C of minus power.

  As shown in FIG. 18, the Hartmann plate 201 provided in the lens characteristic measurement device of the comparative example has pinholes (not shown) at equal intervals. For this reason, as shown to the code | symbol RA of FIG. 18, when performing the optical measurement of the spectacle lens 102A of frequency 0D, measurement range SR on the spectacle lens 102A and measurement pitch SP are formation ranges of each pinhole of Hartmann plate 201 And equal to the pitch. The measurement range SR corresponds to the scanning range of the linear light beam 46 in the lens characteristic measuring apparatus 10C, and the measurement pitch SP corresponds to the scanning pitch of the linear light beam 46 in the lens characteristic measuring apparatus 10C.

  On the other hand, as shown by the symbol RB in FIG. 18, when performing optical measurement of the spectacle lens 102B of positive power, although the measurement range SR is expanded, there arises a problem that the measurement pitch SP becomes rough. Conversely, as shown by the symbol RC in FIG. 18, when performing optical measurement of the spectacle lens 102C of minus power, although the measurement pitch SP becomes finer, there arises a problem that the measurement range SR becomes narrow.

  With respect to such a comparative example, since the lens characteristic measurement device 10C of the fourth embodiment is a scanner type that scans the linear light beam 46 without using the Hartmann plate 201, according to the types of the spectacle lenses 102A to 102C. Thus, the scanning range and scanning pitch of the linear light beam 46 by the scanning optical system 35 can be set arbitrarily. As a result, regardless of the types of the spectacle lenses 102A to 102C, the measurement range SR can be expanded and the measurement pitch SP can be made finer.

  In the lens characteristic measuring apparatus 10C of the fourth embodiment, for example, when the spectacle lens 102 is a progressive lens, the linear beam 46 is scanned at a fine pitch in the vicinity of the progressive band of the progressive lens, and the power change is small. The linear luminous flux 46 can be scanned at a coarse pitch in an area and an area having little influence on the optical performance of the progressive lens, such as an outer peripheral portion of the progressive lens.

  As described above, in the lens characteristic measuring apparatus 10C of the fourth embodiment, the scanning range and the scanning pitch of the linear light beam 46 by the scanning optical system 35 can be set (changed) according to the types of the spectacle lenses 102, 102A to 102C. is there. Therefore, the measurement accuracy can be improved and the scanning range can be expanded by changing the scanning pitch of the linear luminous flux 46 in accordance with the power or partial power change of the entire lens such as the spectacle lens 102 or the like.

<Scan pattern setting>
When the scanning pattern of the linear luminous flux 46 by the scanning optical system 35 can be set (changed) to a ring-shaped or other special-shaped pattern, the shape change of the linear luminous flux 46 pattern before and after transmission of the spectacle lens 102 The measurement makes it possible to measure the power distribution of the spectacle lens 102.

<Adjustment of the number of point images>
FIG. 19 is an explanatory diagram for explaining adjustment of the number of point images of a point image by the linear light beam 46 included in the captured image 52. As shown in FIGS. 17 and 19, the point image number adjustment unit 90 adjusts the number of point images in the optical system control unit 62 and the photographing control unit 64 according to the input operation of the point image number on the operation switch 16. Make a command.

  The optical system control unit 62 receiving the adjustment command of the number of point images adjusts the scanning speed of the scanner 42 of the scanning optical system 35. For example, when the number of point images included in the captured image 52 for one frame is increased, the scanning speed of the scanner 42 is increased. Conversely, when the number of point images is reduced, the scanning speed of the scanner 42 is decreased.

  Further, the imaging control unit 64 that receives the adjustment command of the number of point images controls the driving of the imaging device 50B of the camera 50 to adjust the exposure time (shutter speed) of the imaging device 50B. For example, based on the scanning speed of the scanner 42, the imaging device 50B is configured such that the point image by the number of linear light beams 46 specified by the point image adjustment command is included in the captured image 52 for one frame. Adjust the exposure time of 50B. Alternatively, only the scanning speed of the scanner 42 may be adjusted while fixing the exposure time of the imaging element 50B (without controlling the imaging element 50B).

  By controlling the scanner 42 and the imaging device 50B in this manner, the number of point images included in the captured image 52 for one frame can be adjusted to one as shown by a symbol TA in FIG. As indicated by the reference symbol TB, the number of point images included in the captured image 52 for one frame can be adjusted to a plurality of points. In particular, as the scanning speed of the scanner 42 is increased and the number of point images included in one frame of the captured image 52 is increased, the optical measurement of the spectacle lens 102 can be completed in a short time.

  When the number of point images included in the captured image 52 for one frame is increased, as indicated by the symbols UB and UC in FIG. In some cases, the point images by the linear light beams 46 projected onto the screen 36 may overlap or the positional relationship may be reversed. In this case, the point image number adjustment unit 90 is operated to reduce the scanning speed of the scanner 42, thereby reducing the number of point images included in the captured image 52 (for example, reducing it to one point).

  Also, instead of reducing the scanning speed of the scanner 42, the movement control unit 60 controls the moving unit 54 to move the screen 36 to a position where the overlapping of the point images by the linear light beams 46 and the reversal of the positional relationship do not occur. Alternatively, the position of the point image before and after the movement may be confirmed by moving the screen 36.

  In the lens characteristic measuring apparatus 10A of the second embodiment and the lens characteristic measuring apparatus 10B of the third embodiment, the function of setting the scanning range, scanning pitch, and scanning pattern of the linear light beam 46, and one frame An adjustment function of the number of point images included in the captured image 52 may be provided.

Fifth Embodiment
Next, a lens characteristic measuring apparatus 10D (see FIG. 20) of the fifth embodiment will be described. The scanner 42 according to each of the above embodiments adjusts the swing angles θ and φ of the galvano mirrors 42A to scan the linear light beam 46 in a two-dimensional direction by adjusting the swing angles θ and φ. Also called). The scanning angle of the linear luminous flux 46 refers to, for example, the linear luminous flux 46 emitted from the scanner 42 when each galvano mirror 42A is at the rocking central position, that is, the linear luminous flux 46 at the scanning central position of the scanner 42. 20 is an angle (an angle in the xy direction in FIG. 20) with respect to a reference direction (indicated by an alternate long and short dash line in FIG. 20) parallel to.

  At this time, in the type of scanner 42, for example, a galvano scanner and a MEMS scanner (two-axis MEMS mirror), particularly a MEMS scanner, there is a problem that the reproducibility of the rocking angles θ and φ of the mirror is low. The term "reproducibility" as used herein means that the indicated values (also referred to as control values, set values, designated values, or target values) of the swing angles θ and φ of the mirror by the optical system control unit 62 described above Deviation may occur between the rocking angles θ and φ of the mirror.

  As described above, when the repeatability of the rocking angles θ and φ of the mirror decreases, the actual rocking angles θ and φ of the mirror fluctuate, even if the designated values of the rocking angles θ and φ of the mirror are the same. Therefore, the scanning angle of the linear light beam 46 emitted from the scanner 42 also fluctuates accordingly. In this case, each scanning position P described above varies, so that the measurement accuracy of the optical characteristic of the spectacle lens 102 by the optical characteristic acquisition unit 70 decreases, or the spectacle lens 102 acquired by the optical characteristic acquisition unit 70 The problem arises that the reproducibility of the mapping image (SCA mapping image) of the optical characteristics of the image is degraded. In addition, S of "SCA" is spherical power (spheric), C is astigmatic power (cylinder), and A is an astigmatic axis (Axis).

  Also, in consideration of the accuracy of the surface (lens surface) of the spectacle lens 102 and the dust and scratches on the surface, the reproducibility of the rocking angles θ and φ of the mirror, ie, the linear light beam emitted from the scanner 42 It is desirable that the repeatability of the scanning angle of 46 be high.

  Therefore, in the lens characteristic measuring apparatus 10D (see FIG. 20) of the fifth embodiment, the control of the rocking angles θ and φ of the galvano mirrors 42A by the optical system control unit 62 (corresponding to the control of the scanning angle of the present invention) Make corrections.

  FIG. 20 is a schematic view of the scanning optical system 35, the screen 36, and the photographing optical system 37 of the lens characteristic measurement device 10D of the fifth embodiment. As shown in FIG. 20, the lens characteristic measurement apparatus 10D has basically the same configuration as the lens characteristic measurement apparatus 10 of the first embodiment except that the half mirror 400 and the light receiving optical system 402 are provided. For this reason, the same reference numerals are given to those that are the same in function or configuration as the first embodiment, and the description thereof will be omitted.

  The half mirror 400 corresponds to the second light splitting unit of the present invention, and is provided between the collimator 44 and the surface of the spectacle lens 102 set in the setting unit 20. The half mirror 400 reflects a part of the linear luminous flux 46 emitted from the collimator 44 toward a light receiving optical system 402 described later, transmits the remaining linear luminous flux 46 as it is, and emits it toward the spectacle lens 102. Do.

  The light receiving optical system 402 includes a lens 404, a lens 406, and a CCD (or CMOS) imaging device 408. The lenses 404 and 406 cause the linear light flux 46 reflected by the half mirror 400 to be incident on the light receiving surface of the image sensor 408.

  The imaging element 408 has a light receiving surface for receiving the linear light beam 46 incident from the half mirror 400 through the lenses 404 and 406. Then, the imaging element 408 receives (captures) the linear luminous flux 46 on the light receiving surface, and outputs a light reception signal to the general control unit 58. The light reception signal indicates a light reception position (position coordinates of a pixel in the light reception surface) of the linear light beam 46 on the light reception surface of the imaging element 408.

  Here, the light receiving position of the linear light beam 46 received by the light receiving surface of the imaging element 408 is the swing angle θ, φ of each galvano mirror 42 A, that is, the scanning angle of the linear light beam 46 emitted from the scanner 42 Each θ, φ) differs. Therefore, a one-to-one relationship is established between the light receiving position of the linear light beam 46 on the light receiving surface and the swing angles θ and φ (scanning angles of the linear light beam 46) of the galvano mirrors 42A. Accordingly, the actual swing angles θ and φ of the galvano mirrors 42A are obtained from the light receiving position of the linear light beam 46 on the light receiving surface.

  FIG. 21 is a functional block diagram of the general control unit 58 of the lens characteristic measuring apparatus 10D of the fifth embodiment. As shown in FIG. 21, the integrated control unit 58 of the fifth embodiment is the integrated control unit of the first embodiment except that it functions as the measured value acquisition unit 410 and the correction unit 412 in addition to the above-described units. Basically the same as 58.

  The measured value acquiring unit 410 measures the measured values of the actual rocking angles θ and φ of the galvano mirrors 42A based on the light reception signal input from the imaging device 408 and the correspondence information 414 acquired from the storage unit 59 (measured values Also known as). The correspondence information 414 is information indicating the correspondence between the light receiving position of the linear light beam 46 on the light receiving surface described above and the swing angles θ and φ of the galvano mirrors 42A, and an experiment or simulation is performed in advance. It is created by. Thereby, the measured value acquiring unit 410 determines the light receiving position of the linear light beam 46 in the light receiving surface based on the light receiving signal from the imaging element 408, and further refers to the correspondence information 414 based on the light receiving position. Measurement values of the swing angles θ and φ of the galvano mirrors 42A are obtained.

  The measured values of the swing angles θ and φ of the galvano mirrors 42A correspond to the measured values of the scanning angle of the present invention. Then, the measured value acquiring unit 410 outputs information on the measured values of the swing angles θ and φ of the galvano mirrors 42A to the correcting unit 412.

  The correction unit 412 corrects the control of the swing angles θ and φ of the galvano mirrors 42A by the optical system control unit 62. The correction unit 412 acquires the measured values of the rocking angles θ and φ of the galvano mirrors 42A from the measured value acquisition unit 410, and indicates the instructed values of the rocking angles θ and φ of the galvano mirrors 42A from the optical system control unit 62. To get The indicated value corresponds to the indicated value of the scanning angle of the present invention.

  Next, based on the result of comparing the measured values of the rocking angles θ and φ of each galvano mirror 42A with the indicated values, the correction unit 412 makes the measured values of the respective rocking angles θ and φ coincide with the indicated values. The control of the swing angles θ and φ by the optical system control unit 62 is corrected. Thereby, the correction unit 412 can correct the control of the scanning angle of the linear light beam 46 by the optical system control unit 62.

  FIG. 22 is a flow chart showing a flow of correction control of the swing angles θ and φ of the galvano mirrors 42A by the lens characteristic measurement apparatus 10D of the fifth embodiment. As shown in FIG. 22, when the optical system control unit 62 controls the scanning optical system 35 to emit the linear light beam 46 from the scanner 42 in steps S3 and S6 shown in FIG. Beam 46 is incident on the half mirror 400 via the mirror 43 and the collimator 44. Then, a part of the linear light flux 46 is split by the half mirror 400 and reflected toward the light receiving optical system 402 (step S20, corresponding to the light splitting step of the present invention).

  The linear luminous flux 46 reflected by the half mirror 400 is received by the light receiving surface of the imaging element 408 of the light receiving optical system 402 (step S21, corresponding to the light receiving step of the present invention). Thus, the light reception signal is output from the imaging element 408 to the measurement value acquisition unit 410.

  The measured value acquisition unit 410 refers to the correspondence information 414 read from the storage unit 59 based on the light reception position of the linear light beam 46 on the light receiving surface indicated by the light reception signal input from the imaging element 408, to each galvano mirror Measured values of the rocking angles θ and φ of 42A are obtained (step S22, corresponding to the measured value acquiring step of the present invention). Then, the measured value acquiring unit 410 outputs the measured values of the swing angles θ and φ of the galvano mirrors 42A to the correcting unit 412.

  The correction unit 412 acquires the measurement values of the swing angles θ and φ of the galvano mirrors 42A from the measurement value acquisition unit 410. The correction unit 412 also obtains from the optical system control unit 62 the designated values of the swing angles θ and φ of the galvano mirrors 42A (step S23). Note that the timing of obtaining the instruction value is not limited after step S22, and may be before step S22.

  Then, based on the result of comparing the measured values of the rocking angles θ and φ of the galvano mirrors 42A and the indicated values, the control of the rocking angles θ and φ by the optical system control unit 62 is corrected (step S24, the present invention) Equivalent to the correction step of As a result, the actual rocking angles θ and φ (scanning angles of the linear light flux 46) of the galvano mirrors 42A coincide with the indicated values.

  As described above, in the lens characteristic measuring apparatus 10D of the fifth embodiment, the control of the rocking angles θ and φ of the galvano mirrors 42A by the optical system control unit 62 is corrected to obtain the rocking angles θ of the galvano mirrors 42A. It is possible to reduce the error of the measured value with respect to the indicated value of φ (scanning angle of the linear light beam 46). Thereby, the fluctuation of the rocking angles θ and φ of the galvano mirrors 42A with respect to the command value, that is, the fluctuation of the scanning angle of the linear light beam 46 emitted from the scanner 42 is reduced. As a result, since the fluctuation of each scanning position P described above is suppressed, the measurement accuracy of the optical characteristic of the spectacle lens 102 by the optical characteristic acquisition unit 70 and the reproducibility of the mapping image of the optical characteristic are improved.

  In the fifth embodiment, the half mirror 400 is disposed between the collimator 44 and the surface of the spectacle lens 102 set in the setting unit 20. For example, the half mirror 400 may be disposed between the scanner 42 and the mirror 43 Alternatively, it may be disposed between the mirror 43 and the collimator 44. Also, the mirror 43 may be replaced by a half mirror 400. That is, the position of the half mirror 400 is not particularly limited as long as it is at an intermediate position of the light path of the linear light flux 46 from the scanner 42 to the surface of the spectacle lens 102.

  Correction of the control of the swing angles θ and φ of the galvano mirrors 42A described in the fifth embodiment may not be performed each time the scanning of the linear light beam 46 for each position in the optical axis direction of the screen 36 is performed. For example, this correction may be performed in step S6 (the second scan of the linear light beam 46) instead of the step S3 (the first scan of the linear light beam 46) shown in FIG. .

  In this case, the correction unit 412 measures the measurement values of the rocking angles θ and φ of the galvano mirrors 42A acquired from the measurement value acquiring unit 410 in the first scan of the linear light beam 46 with the rocking angles of the galvano mirrors 42A. Used as indicated values of θ and φ. Thus, the swing angles θ and φ of the galvano mirrors 42A in the second scan of the linear light beam 46 and the measured values of the swing angles θ and φ of the galvano mirrors 42A in the first scan of the linear light beam 46 It can be adapted to. As a result, even when the reproducibility of the rocking angles θ and φ of the galvano mirrors 42A is low, the projection positions Q1 and Q2 at the respective optical distances LO1 and LO2 corresponding to the same scanning position P on the surface of the spectacle lens 102 The position coordinates of Q2 can be acquired for each scanning position P.

  In the fifth embodiment, an example is described in which the function of correcting the control of the swing angles θ and φ of the galvano mirrors 42A is added to the lens characteristic measurement apparatus 10 of the first embodiment. Similar functions may be added to the fourth embodiment.

[Others]
In each of the above embodiments, the first optical distance LO1 and the second optical distance LO2 are set as the optical distances between the spectacle lens 102 and the screen 36, but plural optical distances are set to 3 or more. You may For example, in the first embodiment, the screen 36 and the like are positioned at three or more optical axis direction positions. In the second embodiment, the linear light beam 46 transmitted through the spectacle lens 102 is divided into three or more optical paths, and three or more sets of the screen 36 and the photographing optical system 37 are provided. Furthermore, in the third embodiment, a plurality of types of optical members having different refractive indexes are selectively inserted into and removed from the optical path OP3.

  In each of the above embodiments, the lens characteristic measuring apparatus 10 or the like for measuring the optical characteristics of the left and right spectacle lenses 102 of the spectacle frame 101 without replacing the spectacle frame 101 has been described as an example. The present invention relates to a lens characteristic measuring apparatus for measuring various test lenses such as a lens characteristic measuring apparatus (lens meter) for measuring optical characteristics one by one and a lens characteristic measuring apparatus (lens meter) for measuring optical characteristics of a base lens. Is applicable. The present invention can also be applied to a lens characteristic measurement apparatus that measures the optical characteristics of a subject lens for various uses other than glasses.

10, 10A, 10B, 10C, 10D ... lens characteristic measuring device,
35 ... scanning optical system,
36, 36A, 36B ... screen,
37, 37A, 37B ... shooting optical system,
40 ... light source,
42 ... Scanner,
46 ... linear luminous flux,
50 ... camera,
52 ... shooting image,
54 ... moving part,
58 ... General control unit,
60 ... movement control unit,
62: Optical system control unit,
64: Shooting control unit,
68 ... location acquisition unit,
70: Optical property acquisition unit,
76 ... half mirror,
80 ... glass plate,
81 ... insertion part,
84 ... insertion control unit,
88 ... Scan setting unit,
90 ... point image number adjustment unit,
101 ... glasses frame,
102 ... glasses lens

Claims (11)

A scanning optical system for scanning the surface of the lens to be inspected with a linear light beam;
A screen on which the linear luminous flux transmitted through the test lens is projected;
A setting unit configured to set a plurality of optical distances of the linear light flux between the test lens and the screen;
An imaging optical system which is provided on the side opposite to the scanning optical system with respect to the screen and performs imaging of the screen while scanning of the linear luminous flux is performed by the scanning optical system;
A control unit that executes scanning of the linear light beam in a common scanning pattern by the scanning optical system and photographing of the screen by the photographing optical system for each of the optical distances set by the setting unit; ,
Lens characteristic measuring device provided with A position acquisition unit that analyzes a photographed image of the screen photographed at every optical distance by the photographing optical system, and acquires a projection position of the linear light beam projected on the screen, and the line A position acquisition unit for acquiring the projection position for each of the optical distances of the linear luminous flux transmitted through the same scanning position for each scanning position of the surface of the test lens by the luminous flux;
An optical characteristic acquisition unit that acquires optical characteristics of the test lens based on the plurality of optical distances set by the setting unit and an acquisition result of the projection position by the position acquisition unit;
The lens characteristic measurement device according to claim 1, comprising: The setting unit is a moving unit that holds the screen movably in the optical axis direction of the photographing optical system and moves the screen to positions in the optical axis direction respectively corresponding to a plurality of the optical distances.
The control unit executes scanning of the linear light beam by the scanning optical system and photographing of the screen by the photographing optical system each time the screen is positioned at the position in the optical axis direction by the moving unit. The lens characteristic measuring apparatus according to claim 1 or 2.   The lens characteristic measurement device according to claim 3, wherein the setting unit moves the photographing optical system integrally with the screen. The setting unit is provided at a first light splitting unit that splits the linear light flux transmitted through the test lens into a plurality of light paths, and at a position where the distance from the first light splitting unit differs for each of the light paths. And a plurality of the screens on which the linear light beams are respectively projected from the first light splitting section,
The photographing optical system is individually provided for each of the screens,
The control unit according to claim 1 or 2, wherein the control unit executes one-time scanning of the linear light beam by the scanning optical system and simultaneous photographing of the screen by the photographing optical system provided for each of the screens. Lens characteristic measurement device. The setting unit is an insertion and removal unit that inserts and removes an optical member having light transparency to an optical path of the linear light beam between the test lens and the screen.
The control unit is configured to scan the linear light beam by the scanning optical system when the optical member is disposed on the optical path by the insertion and removal unit and when the optical member is disposed outside the optical path. The lens characteristic measurement device according to claim 1, wherein the photographing of the screen by the photographing optical system is performed.   7. The image forming apparatus according to claim 1, further comprising: a point image number adjustment unit configured to control the scanning optical system to adjust the number of point images by the linear light flux included in a captured image of the screen captured by the capturing optical system. The lens characteristic measuring device according to any one of the items. A scanning setting unit configured to set at least one of a scanning range of the linear luminous flux, a scanning pitch of the linear luminous flux, and a type of the scanning pattern;
The lens characteristics measuring apparatus according to any one of claims 1 to 7, wherein the scanning optical system scans the linear light beam according to the setting in the scan setting unit. The control unit has an optical system control unit that controls the scanning angle of the linear light beam emitted from the scanning optical system, and causes the surface of the test lens to scan with the linear light beam.
A second light splitting unit provided in the middle of the optical path of the linear luminous flux from the scanning optical system to the surface of the lens to be measured and for dividing a part of the linear luminous flux;
A light receiving optical system that receives the linear light beam divided by the second light dividing unit;
A measurement value acquiring unit that acquires a measurement value of the scanning angle based on a light receiving position of the linear light beam received by the light receiving optical system;
A correction unit that corrects control of the scanning angle by the optical system control unit on the basis of a result of comparing an instruction value of the scanning angle acquired in advance and the measurement value acquired by the measurement value acquiring unit;
The lens characteristic measurement device according to any one of claims 1 to 8, comprising: A scanning optical system scans the surface of the lens to be measured with a linear light beam;
Setting a plurality of optical distances of the linear luminous flux between the test lens and a screen on which the linear luminous flux transmitted through the test lens is projected;
A photographing optical system provided on the opposite side to the scanning optical system with respect to the screen, photographing the screen while the linear optical beam is being scanned by the scanning optical system;
The control unit executes scanning of the linear light beam in a common scanning pattern by the scanning optical system and photographing of the screen by the photographing optical system for each of the optical distances set by the setting unit. Step of
Method of operating a lens characteristic measuring device having: The control unit has an optical system control unit that controls the scanning angle of the linear light beam emitted from the scanning optical system, and causes the surface of the test lens to scan with the linear light beam.
A light dividing step of dividing a part of the linear luminous flux on the way of the optical path of the linear luminous flux from the scanning optical system to the surface of the test lens;
A light receiving step of receiving the linear light flux split in the light splitting step;
A measurement value acquisition step of acquiring a measurement value of the scanning angle based on a light reception position of the linear light beam received in the light reception step;
A correction step of correcting the control of the scanning angle by the optical system control unit on the basis of a result of comparison between an instruction value of the scanning angle acquired in advance and the measurement value acquired in the measurement value acquiring step;
A method of operating a lens characteristic measurement device according to claim 10, comprising:

Images