JP2019060851A - Lens characteristics measuring device and method for actuating lens characteristics measuring device - Google Patents

Abstract

To provide a lens characteristics measuring device and a method for actuating the lens characteristics measuring device with which it is possible to prevent a reduction in measurement accuracy in the central and peripheral sections of a photographed image and prevent an increase in device size.SOLUTION: The lens characteristics measuring device comprises: a scanning optical system for scanning the surface of a test lens with a linear beam of light; a Hartmann plate provided on the test lens on the opposite side to the scanning optical system and including a plurality of two-dimensionally arrayed pinholes, the Hartmann plate causing the linear beam of light radiated to the pinholes after having passed through the test lens to be transmitted by scanning by the scanning optical system; a screen to which the linear beam of light having passed through the Hartmann plate is projected; and a photographing optical system, provided on the screen on the opposite side to the Hartmann plate, for photographing the screen while scanning with the linear beam of light is being carried out by the scanning optical system.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 measuring apparatus comprises: an illumination optical system which irradiates a measuring light consisting of a parallel luminous flux having a diameter of a luminous flux covering the measuring range to the test lens; a Hartmann plate on which the measuring light transmitted through the test lens is incident; A screen on which measurement light respectively transmitted through a large number of pinholes of a Hartmann plate is projected, and a photographing optical system for photographing a point image of the large number of measurement lights projected onto the screen (Patent Document 1 and Patent Document 2) reference).

  In the lens characteristic measurement device, 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

  By the way, when moving a screen like the lens characteristic measuring apparatus of patent document 1 and patent document 2, the problem that a lens characteristic measuring apparatus will enlarge by providing a moving mechanism which moves a screen arises. In addition, when the screen is moved, it is susceptible to the reproducibility of the movement distance.

  FIG. 22 is an explanatory view for explaining a problem caused by the light source (measurement light) of the lens characteristic measurement device of Patent Document 1 and Patent Document 2. Note that, in FIG. 22, in the lens characteristic measurement apparatus provided with the light source 300, the collimator 301, the Hartmann plate 302, the screen 303, and the camera 304, optical measurement of the test lens 306 (minus dioptric power) is performed.

  In the lens characteristic measurement devices described in Patent Document 1 and Patent Document 2, as described above, the measurement light 30X of the light beam diameter that covers the measurement range on the lens surface of the test lens 306 is required. For this reason, in this lens characteristic measurement device, it is necessary to use a light source 300 of a type in which the light distribution angle of the measurement light 308 is wide, but the light intensity of the light source 300 is lowered by widening the orientation angle.

  As indicated by symbol XXIIA in FIG. 22, in the light source 300, the luminous intensity of the measurement light 308 on the optical axis 310 is the highest, and the luminous intensity of the measurement light 308 decreases as the angle α with respect to the optical axis 310 increases. Therefore, as shown by a symbol XXIIB in FIG. 22, when a collimated light flux of a large diameter of the measurement light 30X is produced by using the collimator 301, the light quantity distribution 312 of the measurement light 308 has a light quantity in the periphery thereof as compared with that on the optical axis 310. Decreases. Therefore, the illuminance of the point image (bright point) which is transmitted through the pinholes of the Hartmann plate 302 and projected onto the screen 303 is lowered at the peripheral portion thereof as compared with the central portion of the screen 303.

  Further, as indicated by a symbol XXIIC in FIG. 22, in the lens characteristic measurement apparatus, the screen 304 on which the point image is projected is photographed by the camera 304, and the photographed image of the camera 304 is analyzed to detect the position of the point image. Do. For this reason, the image of the peripheral portion in the photographed image becomes dark due to the cosine fourth law when compared with the image on the optical axis 310.

  Furthermore, since the general screen 303 is not an ideal diffusion surface (see the dotted circle 314), the luminous intensity of the measurement light 308 at the angle incident on the screen 303 is the highest, as indicated by symbol XXIID in FIG. In the other directions, the light intensity decreases (see dotted oval 316). In particular, when the test lens 306 is a lens of minus power, the measurement light 308 transmitted through the test lens 306 becomes divergent light. For this reason, since the peripheral luminous flux of the measurement light 308 transmitted through the test lens 306 is directed outward, the luminous intensity of the measurement light 308 that can be received by the camera 304 becomes low. As a result, the illuminance of the point image captured by the camera 304 is lowered in the peripheral portion compared to the central portion of the camera 304.

  Therefore, in the conventional lens characteristic measurement apparatus, when each part (the light source luminance, the gain of the camera 304, the accumulation time of the imaging device of the camera 304, etc.) is adjusted so that the brightness at the center of the photographed image becomes appropriate. , The periphery of the captured image becomes dark. As a result, it is impossible to detect a point image in the peripheral portion. Conversely, if the brightness at the periphery of the captured image is adjusted to be appropriate, the point image in the center of the captured image will be white-out, and the position detection accuracy of the point image will be degraded.

  The present invention has been made in view of such circumstances, and a lens characteristic measuring apparatus capable of preventing the reduction in measurement sensitivity in the central portion and the peripheral portion of the photographed image and the enlargement thereof, and the lens characteristic measurement The purpose is to provide a method of operating the device.

  A lens characteristic measurement device for achieving the object of the present invention is provided on a side opposite to the scanning optical system with respect to the scanning optical system for scanning the surface of the test lens with a linear light beam and the scanning optical system. A Hartmann plate having a plurality of pinholes arranged in a two-dimensional array, and transmitting a linear light flux transmitted through a lens to be measured by scanning with a scanning optical system and emitted to the pinholes; A screen on which a linear light flux transmitted through is projected, and an imaging optical system provided on the opposite side to the screen with respect to the screen and performing imaging of the screen while scanning of the linear light flux is executed by the scanning optical system And a system.

  According to this lens characteristic measurement device, by scanning the linear light beam on the surface of the spectacle lens, it is possible to prevent the difference in the brightness of the point image by the linear light beam between the central portion and the peripheral portion of the photographed image. It is possible to prevent the overlap and the positional relationship of the point images from being projected by the linear light beam projected onto the screen without providing a moving mechanism for moving the screen.

  In a lens characteristic measurement device according to another aspect of the present invention, a position acquisition unit that analyzes a photographed image of a screen photographed by a photographing optical system and acquires a projection position of a linear light beam projected on the screen; Position determination unit for determining the pinhole position of the pinhole through which the linear light beam projected is transmitted, the projection position obtained by the position acquisition unit, the result of determination of the pinhole position by the position determination unit, and the known test And an optical characteristic acquisition unit that acquires an optical characteristic of the lens to be measured based on the positional relationship between the lens, the Hartmann plate, and the screen. This makes it possible to measure the optical characteristics of the test lens with high accuracy regardless of the type of the test lens.

  In the lens characteristic measurement device according to another aspect of the present invention, the position determination unit determines the projection position of the linear light beam acquired by the position acquisition unit and the scanning angle of the linear light beam by the scanning optical system and The pinhole position is determined based on the projected scanning angle of the linear light beam. Thereby, the pinhole position which each linear light beam projected on the screen permeate | transmitted can be discriminate | determined correctly.

  In a lens characteristic measuring apparatus according to another aspect of the present invention, a light dividing portion provided on an optical path of a linear luminous flux from the scanning optical system to the surface of the lens to be measured and dividing a part of the linear luminous flux; A light receiving optical system for receiving a linear light beam divided by the light dividing unit, and a measured value acquiring unit for acquiring a measured value of a scanning angle based on a light receiving position of the linear light beam received by the light receiving optical system. The position determination unit determines the pinhole position based on the projection position of the linear light beam and the measurement value of the scanning angle acquired by the measurement value acquisition unit. Thereby, the pinhole position which each linear light beam projected on the screen each permeate | transmitted can be discriminate | determined more correctly.

  In the lens characteristic measuring apparatus according to another aspect of the present invention, the optical system of the subject lens based on the optical characteristic of the subject lens acquired by the optical characteristic acquisition unit and the measured value of the scanning angle acquired by the measured value acquisition unit. A mapping image generation unit is provided which generates a mapping image indicating the distribution of the characteristics. Thereby, the reproducibility of the mapping image can be improved.

  In the lens characteristic measurement apparatus according to another aspect of the present invention, pinholes are two-dimensionally arranged at equal intervals on the Hartmann plate, and the scanning optical system is configured to have the diameter of the linear luminous flux as pinholes on the Hartmann plate. The adjustment is made to be larger than the diameter of and smaller than the distance between the adjacent pinholes. Thereby, the position detection of the point image by the linear light beam projected on the screen can be surely performed, and the overlap and the positional relationship inversion of the point images by the linear light beam projected on the screen can be prevented. Can.

  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.

  The lens characteristic measurement device according to another aspect of the present invention includes a scan setting unit configured to set at least one of a linear light beam scan range and a scan pattern type, and the scan optical system is set by the scan setting unit. The linear light beam is scanned according to. Thus, the scanning range and the scanning pattern of the linear light flux can be arbitrarily changed according to the type of the spectacle lens.

  In the lens characteristic measurement device according to another aspect of the present invention, an optical system control unit that scans the surface of the lens to be measured with the linear light beam by controlling the scanning angle of the linear light beam emitted from the scanning optical system. A light dividing portion provided in the middle of the optical path of the linear light flux from the scanning optical system to the surface of the lens to be measured and receiving the linear light flux divided by the light dividing portion Based on the optical system and the light receiving position of the linear light beam received by the light receiving optical system, a measured value acquisition unit that acquires a measured value of the scanning angle, an indication value of a scanned angle acquired in advance, and a measured value acquisition unit And a correction unit that corrects the control of the scanning angle by the optical system control unit based on the result of comparing the measured values with each other. 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, an operating method of a lens characteristic measuring apparatus comprises: a Hartmann plate disposed on one surface side of a lens to be examined and having a plurality of two-dimensionally arranged pinholes; In a method of operating a lens characteristic measurement apparatus, comprising: a screen provided on the side opposite to the lens; and an imaging optical system provided on the opposite side to the Hartmann plate with respect to the screen for imaging the screen. The scanning optical system disposed on the other surface side opposite to the one surface side scans the surface of the lens under test with a linear light beam, and the photographing optical system scans the linear light beam by the scanning optical system And photographing the screen on which the linear luminous flux transmitted through the subject lens and the pinhole is projected.

  In an operating method of a lens characteristic measuring apparatus according to another aspect of the present invention, a position acquiring step of analyzing a photographed image of a screen photographed by a photographing optical system and acquiring a projection position of a linear light beam projected on the screen A position determination step of determining the pinhole position of the pinhole through which the linear light beam projected on the screen is transmitted, the projection position acquired in the position acquisition step, and the discrimination result of the pinhole position in the position determination step; An optical characteristic acquisition step of acquiring an optical characteristic of the test lens based on the positional relationship between the known test lens, the Hartmann plate, and the screen; and the line determined by the position acquisition step in the position determination step Based on the projection position of the linear luminous flux, the scanning angle of the linear luminous flux by the scanning optical system, and the scanning angle of the linear luminous flux projected to the projection position Pin hole position is determined, provided along the light path of the linear light beam from the scanning optical system to the surface of the lens to be measured, and divided by the light division step of dividing a portion of the linear light beam and the light division step And a measured value acquiring step of acquiring a measured value of a scanning angle based on a light receiving position of the linear light flux received by the light receiving optical system, and a light receiving step of receiving the linear light flux received by the light receiving optical system. The position determination step determines the pinhole position based on the projection position of the linear light beam and the measurement value of the scanning angle acquired in the measurement value acquisition step.

  In the method of operating a lens characteristic measuring apparatus according to another aspect of the present invention, the lens characteristic measuring apparatus controls the scanning angle of the linear luminous flux emitted from the scanning optical system, and the surface of the lens to be measured by the linear luminous flux. An optical system control unit for scanning the light, and in the middle of the light path of the linear light beam from the scanning optical system to the surface of the lens to be detected, a light dividing step of dividing a part of the linear light beam; And a measured value acquiring step of acquiring a measured value of the scanning angle based on the light receiving step of receiving the linear luminous flux divided in the step and the light receiving position of the linear luminous flux received in the light receiving step; The correction step of correcting the control of the scanning angle by the optical system control unit on the basis of the result of comparing the instruction value and the measurement value acquired in the measurement value acquisition step.

  The present invention can realize the prevention of reduction in measurement sensitivity in the central part and the peripheral part of a photographed image and the prevention of enlargement.

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 a top view of a Hartmann plate. It is the enlarged view to which a part of upper surface of the Hartmann plate was expanded. It is explanatory drawing for demonstrating the reason which provided the upper limit in the diameter of linear light beam. It is a functional block diagram of a general control part of a 1st embodiment. It is explanatory drawing of projection position information which a position acquisition part acquires based on image information and this image information. It is explanatory drawing for demonstrating the discrimination process of the pinhole by the position discrimination | determination part, and its position. It is an explanatory view for explaining acquisition of an optical center position of an eyeglass 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 a functional block diagram of general control part of the lens characteristic measuring device of a 2nd embodiment. 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 apparatus of 3rd Embodiment, a screen, and imaging | photography optical system. It is a functional block diagram of the integrated control part of the lens characteristic measuring device of a 3rd 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 3rd Embodiment. It is a functional block diagram of the lens characteristic measuring apparatus of 4th Embodiment. It is an explanatory view of image information and projection position information of a 4th embodiment. It is explanatory drawing for demonstrating the discrimination process of the pinhole by the position discrimination | determination part of 4th Embodiment, and its pinhole position. It is a flowchart which shows the flow of a production | generation of the mapping image by the lens characteristic measuring apparatus of 4th Embodiment. It is explanatory drawing for demonstrating the subject resulting from the light source (measurement light) of the lens characteristic measuring apparatus of patent document 1 and patent document 2. FIG.

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 simultaneously 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. 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.

  In the lower housing 12 and the back housing 13, as shown in FIG. 4 described later, the linear light flux 46 transmitted respectively through the left and right eyeglass lenses 102 of the eyeglass frame 101 set in the set portion 20 is irradiated. A pair of Hartmann plates 32, a pair of screens 36 on which the linear light beams 46 respectively transmitted through the pair of Hartmann plates 32 are projected, and a pair of photographing optical systems 37 for photographing the pair of screens 36 respectively It is done.

  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 which has entered each of the cover glasses 30 is applied to a Hartmann plate 32 (see FIG. 4) provided on the lower side of the cover glass 30.

[Scanning optical system, Hartmann plate, screen, and photographing optical system]
FIG. 4 is a schematic view showing one of a pair of “scanning optical system 35, Hartmann plate 32, screen 36, and photographing optical system 37” used for measurement of the optical characteristics of the left and right eyeglass lenses 102 as a representative example. .

  As shown in FIG. 4, the scanning optical system 35 is disposed on the upper side (the other side of the present invention) of the spectacle lens 102 set in the set unit 20, and includes the light source 40, the lens 41, the scanner 42 and the 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). Thus, while the linear light beam 46 is emitted toward the mirror 43, the scanner 42 changes the scanning angle (oscillation angle θ, φ) of the linear light beam 46, whereby the linear light beam 46 is two-dimensionally Can scan at high speed.

  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. Then, the linear light beam 46 irradiated to each scanning position P of the spectacle lens 102 transmits the spectacle lens 102 and the cover glass 30, respectively, and the Hartmann plate 32 positioned on the lower side (one side of the present invention) of both. Irradiated.

  At this time, in the present embodiment, the linear luminous flux 46 is continuously emitted 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.

  FIG. 5 is a top view (bottom view) of the Hartmann plate 32. As shown in FIG. As shown in FIGS. 4 and 5, the Hartmann plate 32 is in contact with a position opposite to the scanning optical system 35 with respect to the spectacle lens 102 and the cover glass 30, more specifically, to the lower surface of the cover glass 30. It is provided. In addition, the Hartmann plate 32 is adjusted in advance so that the center 32O thereof coincides with the photographing optical axis OB.

  The Hartmann plate 32 is, for example, a light shielding member in which chromium or the like is vapor-deposited on a glass substrate. In the Hartmann plate 32, a large number of pinholes 32A (also referred to as openings or holes) are formed in a matrix (two-dimensional arrangement) at equal intervals along the first direction X and the second direction Y described above. There is. For example, in the present embodiment, 13 × 23 pinholes 32A with a diameter of 0.5 mm are arranged at a pitch of 2 mm. Each pinhole 32A transmits the linear luminous flux 46. The arrangement direction and the arrangement pattern of the pinholes 32A in the Hartmann plate 32 are not particularly limited, and may be, for example, arranged in a circumferential pattern or a radiation pattern. A condensing lens may be disposed in each of the pinholes 32A and 32B.

  FIG. 6 is an enlarged view of a part of the top surface of the Hartmann plate 32. As shown in FIG. As shown in FIGS. 4 and 6, when the linear light beam 46 is continuously scanned in the two-dimensional direction on the surface of the spectacle lens 102 as described above, it is transmitted through the spectacle lens 102 and the like to obtain the Hartmann plate 32. The linear luminous flux 46 emitted to the light beam is also scanned continuously in a two-dimensional direction on the top surface of the Hartmann plate 32. The continuous scanning means that an arbitrary linear luminous flux 46 overlaps with at least one part of the preceding linear luminous flux 46. Then, when the scanning position PH of the linear light beam 46 on the top surface of the Hartmann plate 32 matches (including substantially matches) the position of the pinhole 32A, the linear light beam 46 transmits through the pinhole 32A and is projected on the screen 36 Be done.

  Here, it is preferable that the diameter (diameter of light flux) of the linear light flux 46 emitted from the light source 40 be formed larger than the diameter PD of the pinhole 32A on the Hartmann plate 32. As a result, the diameter (beam diameter) of the linear beam 46 transmitted through the pinhole 32A and projected onto the screen 36 can be adjusted to the diameter PD. If the diameter of the linear luminous flux 46 becomes too small, the position detection of the point image by the linear luminous flux 46 projected on the screen 36 may fail, so the diameter of the linear luminous flux 46 is made larger than the diameter PD. By doing this, the position detection of the point image by the linear light flux 46 can be reliably performed.

  Further, it is preferable that the diameter (beam diameter) of the linear light beam 46 emitted from the light source 40 be smaller than the distance PL between the pinholes 32A adjacent to each other on the Hartmann plate 32.

  FIG. 7 is an explanatory view for explaining the reason why the diameter of the linear luminous flux 46 is provided with an upper limit. As shown in FIG. 7, if the diameter of the linear luminous flux 46 is larger than the distance PL, the linear luminous flux 46 may be simultaneously transmitted through the adjacent pinholes 32A and projected onto the screen 36, respectively. In this case, as shown by reference numeral 7A in FIG. 7, if the spectacle lens 102 is a lens of minus dioptric power or positive dioptric power, point images by two linear luminous flux 46 simultaneously projected on the screen 36 are separated. ing.

  On the other hand, as shown by reference numeral 7B in FIG. 7, when the spectacle lens 102 is a lens with a positive intensity number, point images by two linear light beams 46 simultaneously projected on the screen 36 overlap. Therefore, it is difficult to separate and detect these two point images. Further, as shown by the code 7C in FIG. 7, when the spectacle lens 102 is a lens with a positive intensity number, linear light beams 46 simultaneously transmitted through the adjacent pinholes 32A intersect in front of the screen 36. The positional relationship of the point image by the two linear light beams 46 simultaneously projected on the screen 36 is reversed.

  Therefore, in the present embodiment, by forming the diameter of the linear light flux 46 smaller than the distance PL, it is possible to prevent the overlapping of the point images by the two linear light flux 46 and the reversal of the positional relationship.

  Returning to FIG. 4, the screen 36 is provided on the lower side of the Hartmann plate 32. The screen 36 is, for example, a sanded glass substrate or the like, and has diffuse permeability. The linear luminous flux 46 transmitted through the pinhole 32 A of the Hartmann plate 32 is projected onto the screen 36. Then, the scanner 42 scans the linear light beam 46 in a two-dimensional direction, and as a result, the pinhole 32A through which the linear light beam 46 passes is changed, the linear light beam 46 projected on the screen 36 The projection position Q also changes.

  Therefore, in the present embodiment, although the details will be described later, the projection position Q of the linear light beam 46 projected on the screen 36 is detected, and the position of the pinhole 32A through which the linear light beam 46 is transmitted is determined (specified) By doing this, it is possible to detect the inclination angle of the linear light beam 46 transmitted through the spectacle lens 102 and projected onto the screen 36.

  The photographing optical system 37 is provided on the side opposite to the Hartmann plate 32 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 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.

[Overall control unit]
FIG. 8 is a functional block diagram of the general 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. As shown in FIG. 8, 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), a memory, etc. 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 general control unit 58 executes a software program (not shown) in the storage unit 59 to execute an optical system control unit 62, an imaging control unit 64, an image acquisition unit 66, a position acquisition unit 68, a position determination unit 69, and optical It functions as the characteristic acquisition unit 70.

  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 drive of the scanner 42 (scanning angle of the linear light beam 46). The optical system control unit 62 outputs continuous linear light flux 46 from the light source 40 according to the input of measurement start operation to the operation switch 16 and the linear light flux 46 in a predetermined scanning pattern by the scanner 42. And performing a two-dimensional scan. As a result, the linear luminous flux 46 is scanned in a two-dimensional direction on the surface of the spectacle lens 102, and at the same time, the linear luminous flux 46 transmitted through the spectacle lens 102 is scanned in a two-dimensional direction on the upper surface of the Hartmann plate 32.

  The shooting control unit 64 controls the shooting of the screen 36 by the camera 50. The imaging control unit 64 causes the camera 50 to continuously capture an image of the screen 36 while the scanning optical system 35 scans the linear light beam 46. As a result, the captured image 52 of the screen 36 is continuously input from the camera 50 to the image acquisition unit 66 described later.

  Here, when the photographing by the camera 50 is performed at the timing when the scanning position PH of the linear light beam 46 and the position of the pinhole 32A coincide with each other, the photographed image 52 obtained by this photographing is projected on the screen 36 The point image by the linear light flux 46 is included. In the present embodiment, the above-described optical system control unit 62 controls the linear light flux 46 by the scanning optical system 35 so that the number of point images by the linear light flux 46 included in each captured image 52 is one. Control the scan speed.

  On the other hand, when the photographing by the camera 50 is performed at the timing when the scanning position PH of the linear luminous flux 46 and the position of the pinhole 32A do not match, the photographed image 52 obtained by this photographing is a point by the linear luminous flux 46 It does not contain an image.

  The image acquisition unit 66 sequentially acquires the captured image 52 from the camera 50. At the same time, the image acquisition unit 66 also detects the scanning angles (swing angles θ and φ of the galvano mirrors 42A) of the linear light beam 46 emitted from the scanner 42 at the time of photographing the photographed image 52 from the optical system control unit 62 and the like. Obtain one by one. The scanning angle of the linear luminous flux 46 is information indicating the scanning position P at which the linear luminous flux 46 is irradiated on the surface of the spectacle lens 102. Then, the image acquisition unit 66 stores the captured image 52 acquired from the camera 50 in the image information 72 (see FIG. 9) in the storage unit 59 in a state in which the scanning angle of the linear light beam 46 can be identified.

  FIG. 9 is an explanatory diagram of the image information 72 and the projection position information 74 acquired by the position acquisition unit 68 based on the image information 72. As shown in FIG. As shown in FIG. 9, in the image information 72, each captured image 52 continuously input from the image acquisition unit 66 is associated with the scanning angle (scanning position P) of the linear light beam 46 corresponding to each. It is memorized in the state.

  The position acquisition unit 68 acquires, from the captured image 52, the position coordinates of the projection position Q 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 by the scanning optical system 35 and the photographing of the screen 36 by the camera 50 are completed. Then, the position acquisition unit 68 analyzes each photographed image 52 in the image information 72, and determines the photographed image 52 including a point image by the linear light flux 46 in each photographed image 52. Next, the position acquisition unit 68 generates projection position information 74 based on the result of acquiring the position coordinates of the projection position Q of the linear light flux 46 from each captured image 52 including the point image by the linear light flux 46. The position coordinates of the projection position Q are, for example, coordinates with the point intersecting the photographing optical axis OB on the screen 36 as the origin.

  In the projection position information 74, the scanning angles of the linear luminous flux 46 corresponding to the photographed image 52 including the point image by the linear luminous flux 46 correspond to the position coordinates of the projection position Q respectively corresponding to the respective scanning angles. Is stored. The projection position information 74 is output from the position acquisition unit 68 to the position determination unit 69 and the optical characteristic acquisition unit 70, respectively.

  Referring back to FIG. 8, the position determination unit 69 determines the pinhole 32A of the Hartmann plate 32 through which the linear light beam 46 projected on the screen 36 passes and the pinhole position W (see FIG. 11) which is the position. . After 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 position determination unit 69 acquires the projection position information 74 described above from the position acquisition unit 68 and in the storage unit 59. The device information 77 of is referred to.

  In the device information 77, as shown in FIG. 10 described later, information regarding the positions of the Hartmann plate 32 and the screen 36 on the photographing optical axis OB, and the position coordinates of each pinhole 32A in the Hartmann plate 32 are stored in advance. ing. The position coordinates of each pinhole 32A are coordinates with the center 32O of the Hartmann plate 32 (the center 32O positioned according to the photographing optical axis OB) as the origin.

  FIG. 10 is an explanatory diagram for explaining the discrimination process of the pinhole 32A and the position thereof by the position discrimination unit 69. As shown in FIG. As shown in FIG. 10, first, based on the projection position information 74, the position determination unit 69 determines (specifies) the pinhole 32A of the Hartmann plate 32 through which the linear light beam 46 projected on the screen 36 passes.

  Specifically, the scanning position P of the linear light beam 46 (irradiation of the linear light beam 46 from the collimator 44 with respect to the spectacle lens 102) based on the scanning angle of the linear light beam 46 (pivotal angles .theta. And .phi. Of the galvano mirrors 42A). Position is required. Further, although the refraction angle of the linear light flux 46 transmitted through the spectacle lens 102 varies depending on the type of the spectacle lens 102 (plus power, minus power, magnitude of power, etc.), the line transmitted through the spectacle lens 102 The projection position Q of the flat luminous flux 46 on the screen 36 has already been obtained by the projection position information 74.

  On the other hand, in the lens characteristic measuring apparatus 10, the positions of the pinholes 32A in the Hartmann plate 32 are fixed. Further, the positional relationship between the Hartmann plate 32 and the screen 36 is also fixed, and the inclination angle of the linear light beam 46 from the transmission of the spectacle lens 102 to the projection onto the screen 36 is constant.

  Then, the linear light beam 46 transmitted through the optical central portion of the spectacle lens 102 and irradiated to the central portion of the Hartmann plate 32 is less affected by refraction by the spectacle lens 102, so the shift between the scanning position P and the projection position Q Becomes smaller. Therefore, by initially analyzing the scanning position P and the projection position Q corresponding to the central portion of the spectacle lens 102, the pinhole 32A through which the linear light flux 46 has passed can be determined with high accuracy. Next, with reference to the pinhole position W (see FIG. 11) of the pinhole 32A, the scanning angle (scanning position P) of the linear light beam 46, the projection position Q of the linear light beam 46, and the device information 77 Based on [the pinhole position W of each pinhole 32A (see FIG. 11)], the pinhole 32A through which the linear luminous flux 46 transmitted through other than the optical center of the spectacle lens 102 can be determined.

  Therefore, the position determination unit 69 determines the scanning angle (scanning position P) of the linear light beam 46, the projection position Q of the linear light beam 46 on the screen 36, and the respective pinholes 32A stored in the device information 77. Based on the pinhole position W (see FIG. 11), the pinhole position W of the pinhole 32A through which the linear light flux 46 has passed can be determined.

  Then, the position determination unit 69 obtains optical characteristic of the pinhole position information 79 indicating the correspondence between the scanning angle of each linear light beam 46 and the pinhole position W (see FIG. 11) corresponding to each linear light beam 46. Output to section 70.

  The position determination unit 69 may determine the pinhole 32A and the pinhole position W (see FIG. 11) through which each linear light beam 46 has been transmitted, using another method. For example, a filter that transmits white light (red light, green light, blue light, etc.) in a specific wavelength range to one or more predetermined pinholes 32A in the Hartmann plate 32 using white light as the linear light flux 46 Set up. When a filter is provided in the plurality of pinholes 32A, the type of filter (the wavelength range of light to be transmitted) may be different for each pinhole 32A. In addition, a color imaging element is used as the imaging element 50B.

  In this example, the position determination unit 69 analyzes each captured image 52 in the image information 72 to obtain a captured image 52 (hereinafter referred to as “the 1 and the photographed image 52 (hereinafter referred to as the second photographed image 52) including a point image by the linear light beam 46 transmitted through the pinhole 32A without filter.

  The position discrimination unit 69 stores the pinhole position W (see FIG. 11) of the pinhole 32A with a filter in the Hartmann plate 32 and the scanning pattern of the linear light beam 46 in the device information 77 in advance. The pinhole position W corresponding to the first captured image 52 can be easily determined simply by referring to the device information 77.

  Next, the position determination unit 69 determines the imaging order of the first and second captured images 52 and 52, the scanning pattern of the linear light beam 46, and the positional relationship between the pinholes 32A in the Hartmann plate 32. Based on the above, it is possible to determine the position of the non-filtered pinhole 32A corresponding to each of the second photographed images 52 with reference to the previously determined position of the filtered pinhole 32A.

  Referring back to FIG. 8, the optical characteristic acquisition unit 70 receives the projection position information 74 input from the position acquisition unit 68, the pinhole position information 79 input from the position determination unit 69, and the device information 77 in the storage unit 59. The optical center position (optical axis OA) of the spectacle lens 102 and the optical characteristic [back focus Bf (see FIG. 11), etc.] are acquired.

  FIG. 11 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. 11, based on the projection position information 74 and the pinhole position information 79, the pinhole position W of the pinhole 32A through which each linear light beam 46 is transmitted and the projection position on the screen 36 of each linear light beam 46 Q has been obtained. Therefore, the optical characteristic acquisition unit 70 detects the inclination angle of each linear light beam 46 projected on the screen 36 based on the pinhole position W and the projection position Q for each linear light beam 46 projected on the screen 36. . Thereby, the optical property acquisition 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 optical axis OB is emitted. it can.

  Further, since the positions of the Hartmann plate 32 and the screen 36 on the photographing optical axis OB are known based on the device information 77, the distance ΔL between the Hartmann plate 32 and the screen 36 is known. Furthermore, since the set position of the spectacle lens 102 is known, the distance ΔLA between the back surface of the spectacle lens 102 and the Hartmann plate 32 is also known. Further, for each linear light beam 46 projected on the screen 36, ΔH which is the difference between the pinhole position W and the projection position Q (difference in the direction perpendicular to the photographing optical axis OB) is also determined. 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 lens characteristic measuring apparatus 10 is a conventional apparatus for irradiating the spectacle lens 102 with the measurement light having a large diameter as shown in FIG. 22 described above for the Hartmann plate 32, the screen 36, and the photographing optical system 37. Basically the same. Therefore, if the pinhole position W and the projection position Q for each linear light beam 46 are obtained, the optical characteristic acquisition unit 70 basically calculates the optical center position of the spectacle lens 102 and the same method as the conventional device. The back focus Bf can be obtained. The optical characteristic acquisition unit 70 can also obtain the optical characteristic of the spectacle lens 102 other than the back focus Bf by the same calculation method as that of the conventional device. 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. 12 is a flowchart showing a flow of measurement processing (operation method of the lens characteristic measuring apparatus) of the optical characteristic of the left and right spectacle lenses 102 of the spectacle frame 101 by the lens characteristic measuring apparatus 10 of 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 optical system control unit 62 causes the linear light beam 46 to be continuously emitted from the light source 40, and the two galvano of the scanner 42 according to a predetermined scanning pattern. At least one of the mirrors 42A is displaced. As a result, the linear light beam 46 is scanned in a two-dimensional direction in the above-described scanning pattern on the surface of the spectacle lens 102 (step S2).

  Then, in response to the scanning of the linear luminous flux 46 on the surface of the spectacle lens 102, the linear luminous flux 46 transmitted through the spectacle lens 102 and the cover glass 30 is of the Hartmann plate 32, as shown in FIG. The upper surface is scanned in a two-dimensional direction. Thus, when the scanning position PH of the linear light beam 46 coincides with the position of the pinhole 32A on the upper surface of the Hartmann plate 32, the linear light beam 46 is transmitted through the pinhole 32A and projected onto the screen 36. . As a result, the linear luminous flux 46 is transmitted through the respective pinholes 32A of the Hartmann plate 32 in order and projected on the screen 36 respectively.

  In this embodiment, unlike the conventional apparatus (see FIG. 22) in which the measuring lens having a large diameter corresponding to the measuring range of the eyeglass lens 102 is irradiated to the eyeglass lens 102 (see FIG. 22), a narrow linear shape is formed on the surface of the eyeglass lens 102. Since the luminous flux 46 is scanned, the luminous intensity of the light source 40 can be sufficiently ensured, and the light distribution of the luminous source 40 causes a difference in the brightness of the point image by the linear luminous flux 46 between the central portion and the peripheral portion of the photographed image 52 Is prevented from occurring. For this reason, since the light amount change of the point image at the central part or the peripheral part of the photographed image 52 is reduced compared to the conventional device, the peripheral part of the photographed image 52 becomes dark or the point image of the central part of the photographed image 52 Since overexposure is prevented, it is possible to prevent a drop in measurement sensitivity in the central portion and the peripheral portion of the photographed image 52.

  On the other hand, while the scanning of the linear light beam 46 is being performed, the imaging control unit 64 controls the camera 50 to execute continuous imaging of the screen 36 (step S3). 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 scanning angle of the linear light beam 46 (swing angles .theta., .Phi. ) Are sequentially stored in the image information 72 in the storage unit 59 in a state where they can be identified.

  At this time, in the present embodiment, the scanning speed of the linear light beam 46 by the scanning optical system 35 is controlled so that the number of point images by the linear light beam 46 included in each photographed image 52 becomes one point. . For this reason, even when the spectacle lens 102 is a convex lens with a positive intensity number as shown by reference numerals 7B and 7C in FIG. 7 described above, the point image by the linear light beam 46 projected on the screen 36 is It is possible to prevent the overlap and the reversal of the positional relationship. Since this eliminates the need to move the screen 36 as in Patent Document 1 described above, the problems of upsizing of the lens characteristic measuring apparatus 10 and reproducibility of the movement distance of the screen 36 do not occur.

  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 acquires each photographed image 52 in the image information 72 stored in the storage unit 59. Analysis is performed to determine the photographed image 52 including the point image by the linear light flux 46 and to acquire the position coordinates of the projection position Q of the linear light flux 46 (step S4). Then, the position acquisition unit 68 generates the projection position information 74 as shown in FIG. 9 described above, and outputs the projection position information 74 to the position determination unit 69 and the optical characteristic acquisition unit 70, respectively.

  Next, the position determination unit 69 determines the projection position information 74 (the scanning angle and the projection position Q of the linear light beam 46) input from the position acquisition unit 68 and the device information 77 (the pin for each pinhole 32A) in the storage unit 59. Based on the hole position W), the pinhole position W of the pinhole 32A through which each linear light flux 46 has been transmitted is determined (step S5). Then, the position determination unit 69 generates pinhole position information 79 as shown in FIG. 10 described above, and outputs the pinhole position information 79 to the optical characteristic acquisition unit 70.

  The optical property acquisition unit 70 receiving the projection position information 74 and the pinhole position information 79 receives the pinhole position W of the pinhole 32A through which each linear beam 46 has been transmitted, and each linear beam 46 based on the information. And the projection position Q on the screen 36 of FIG. Next, based on the determination result, the optical property acquisition unit 70 detects the inclination angle of each linear light beam 46 projected on the screen 36.

  Then, as shown in FIG. 11 described above, the optical characteristic acquisition unit 70 is based on the inclination angle of each linear light beam 46 and the device information 77 in the storage unit 59, as shown in FIG. The optical center position (optical axis OA) of the spectacle lens 102 and the optical characteristic [back focus Bf etc.] are acquired using the same calculation method (analysis method) (step S6). 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 linear luminous flux 46 is scanned on the surface of the eyeglass lens 102 so that the point by the linear luminous flux 46 in the central portion and the peripheral portion of the photographed image 52 Since a difference in the brightness of the image is prevented, a decrease in measurement sensitivity in the central portion and the peripheral portion of the captured image 52 is prevented. In addition, since it is possible to prevent the overlapping and the positional relationship of the point images by the linear light beams 46 projected on the screen 36 without providing the moving mechanism for moving the screen 36, the large size of the lens characteristic measuring apparatus 10 can be obtained. Is prevented. As a result, it is possible to realize the prevention of the decrease in the measurement sensitivity in the central part and the peripheral part of the photographed image 52 and the prevention of the enlargement of the lens characteristic measuring apparatus 10.

Lens Characteristic Measurement Device of Second Embodiment
FIG. 13 is a functional block diagram of the general control unit 58 of the lens characteristic measuring apparatus 10A of the second embodiment. The lens characteristic measuring apparatus 10A of the second embodiment sets the scanning range and scanning pattern of the linear light beam 46 and adjusts the number of point images of the point image by the linear light beam 46 included in the photographed image 52 for one frame. And has a function to do.

  As shown in FIG. 13, the lens characteristic measuring apparatus 10A of the second 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 of the linear light beam 46 (measurement range of the eyeglass lens 102) and the scan pattern according to the scan setting operation input to the operation switch 16 I do. 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 and scanning pattern of the linear light beam 46.

  By making it possible to set (change) the scanning range of the linear luminous flux 46, it is possible to selectively scan the linear luminous flux 46 only in the area necessary for the measurement of the optical characteristics in the spectacle lens 102. For example, when the spectacle lens 102 is a single focus lens, it is not necessary to scan the linear light beam 46 in a wide measurement range (scanning range). For this reason, the scanning range of the linear luminous flux 46 is set so that the linear luminous flux 46 scans, for example, four pinholes 32A at the central portion of the Hartmann plate 32. In this case, the measurement (analysis) of the optical characteristics by the lens characteristics measurement apparatus 10 can be performed at high speed.

  Also, by making it possible to set (change) the scanning pattern of the linear light beam 46, for example, when it is possible to set (change) the scanning pattern to a ring shape or a pattern of another special shape, before and after transmission of the eyeglass lens 102. By measuring the change in the shape of the pattern of the linear light flux 46, it is possible to measure the power distribution of the spectacle lens 102.

  FIG. 14 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. 13 and 14, the point image number adjustment unit 90 adjusts the number of point images with respect to the optical system control unit 62 and the photographing control unit 64 according to the input operation of the point image number to 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 point, or as shown by reference numeral XIVA in FIG. As indicated by symbol XIVB, 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. For example, the scanning of the linear light flux 46 on the surface of the spectacle lens 102 may be completed while the camera 50 captures the one frame of the captured image 52.

  When the number of point images included in the captured image 52 for one frame is increased, as indicated by the reference numerals 7B and 7C 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).

Third Embodiment
Next, a lens characteristic measuring apparatus 10B (see FIG. 15) of the third embodiment will be described. The scanner 42 according to each of the above embodiments adjusts the scanning angle of the linear light beam 46 so that the linear light beam 46 is scanned in a two-dimensional direction by adjusting the rocking angles θ and φ of the galvano mirrors 42A. ing. The scanning angle (also referred to as emission angle) of the linear light beam 46 refers to, for example, the linear light beam 46 emitted from the scanner 42 when each galvano mirror 42A is at the swing center position, ie, the scanning center of the scanner 42 This is an angle (an angle in the xy direction in FIG. 15) with respect to a reference direction (indicated by an alternate long and short dash line in FIG. 15) parallel to the linear light flux 46 at the position.

  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 low reproducibility here means that the indicated values (also referred to as control values, set values, or target values) of the swing angles θ and φ of the mirror by the optical system control unit 62 described above and the swing of the actual mirror Deviation may occur between the movement angles θ and φ.

  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, since the scanning positions P described above are respectively changed, the position (light flux profile) of the pinhole 32A in the Hartmann plate 32 through which the linear light flux 46 passes is also changed. As a result, the measurement accuracy of the optical characteristic of the eyeglass lens 102 by the optical characteristic acquisition unit 70 decreases, or the reproducibility of the mapping image (SCA mapping image) of the optical characteristic of the eyeglass lens 102 acquired by the optical characteristic acquisition unit 70 There is a problem of deterioration. 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 10B of the third embodiment (see FIG. 15), 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. 15 is a schematic view of the scanning optical system 35, the screen 36, and the photographing optical system 37 of the lens characteristic measuring apparatus 10B of the third embodiment. As shown in FIG. 15, the lens characteristic measuring apparatus 10B has basically the same configuration as the lens characteristic measuring 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 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. 16 is a functional block diagram of the general control unit 58 of the lens characteristic measuring apparatus 10B of the third embodiment. As shown in FIG. 16, the integrated control unit 58 of the third 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 acquiring unit 410, and specifies the rocking angles θ and φ of the galvano mirrors 42A from the optical system control unit 62. To get This designated value corresponds to the designated value of the scanning angle of the present invention.

  Next, the correction unit 412 compares the measured values of the rocking angles θ and φ with the specified values based on the result of comparing the measured values of the rocking angles θ and φ of the galvano mirrors 42A with the specified 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. 17 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 10B of the third embodiment. As shown in FIG. 17, 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 S2 and S3 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. In addition, the correction unit 412 acquires designated values of the swing angles θ and φ of the galvano mirrors 42A from the optical system control unit 62 (step S23). Note that the timing of obtaining this designated 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 designated 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 designated values.

  As described above, in the lens characteristic measuring apparatus 10B of the third 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 specified 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 third 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.

  In the third 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 two embodiments.

Fourth Embodiment
FIG. 18 is a functional block diagram of a lens characteristic measuring apparatus 10C of the fourth embodiment. In the lens characteristic measurement apparatus 10 of the fourth embodiment, the measurement values of the swing angles θ and φ of the galvano mirrors 42A acquired by the measurement value acquisition unit 410 described in the third embodiment described above are used. The optical characteristics (mapping image) of the spectacle lens 102 are obtained.

  As shown in FIG. 18, in the lens characteristic measuring apparatus 10C of the fourth embodiment, the general control unit 58 does not function as the correction unit 412 (see FIG. 16) of the third embodiment, and the optical characteristic acquiring unit 70 maps. The configuration is basically the same as that of the lens characteristic measurement device 10B of the third embodiment except that it functions as the image generation unit 416. For this reason, the same reference numerals are given to those that are the same in function or configuration as the above-described embodiments, and the description thereof will be omitted.

  The measured value acquiring unit 410 of the fourth embodiment acquires the measured values of the swing angles θ and φ of the galvano mirrors 42A, that is, the measured values of the scanning angle of the linear light beam 46, as in the third embodiment. . Then, the measured value acquiring unit 410 stores the measured values of the rocking angles θ and φ (scanning angles of the linear light flux 46) of the galvano mirrors 42A in the image information 72 in the storage unit 59.

  FIG. 19 is an explanatory diagram of the image information 72 and the projection position information 74 of the fourth embodiment. FIG. 20 is an explanatory diagram for explaining the discrimination process of the pinhole 32A and the pinhole position W by the position discrimination unit 69 of the fourth embodiment.

  As shown in FIG. 19, in the image information 72 of the fourth embodiment, each photographed image 52 continuously input from the image acquiring unit 66 is a line corresponding to each input from the measurement value acquiring unit 410. It is stored in association with the measured value of the scanning angle of the bundle of rays 46.

  The position acquisition unit 68 of the fourth embodiment generates the projection position information 74 based on the image information 72 as described in the first embodiment (see FIG. 9). In the projection position information 74 of the fourth embodiment, measurement of the position coordinates of the projection position Q of the linear light beam 46 projected on the screen 36 and measurement of the scanning angle of the linear light beam 46 corresponding to each position coordinate Values are stored in association with each other.

  As shown in FIG. 20, the position determination unit 69 of the fourth embodiment is projected on the screen 36 based on the projection position information 74 and the device information 77 as described in the first embodiment (see FIG. 10). The pinhole 32A of the Hartmann plate 32 through which the linear light beam 46 has passed and the pinhole position W thereof are determined.

  Specifically, the position determination unit 69 scans each linear beam 46 based on the measurement value of the scanning angle of each linear beam 46 (swing angle θ, φ of each galvano mirror 42A) stored in the projection position information 74. The measurement position of the position P is determined. As a result, even if the reproducibility of the rocking angles θ and φ of the galvano mirrors 42A is low, the position judging unit 69 accurately corrects the scanning positions P of the linear light beams 46 respectively corresponding to the position coordinates of the projection positions Q. Desired. As a result, since the position determination unit 69 can analyze the scanning position P and the projection position Q corresponding to the central portion of the spectacle lens 102 with higher accuracy than the first embodiment, the scanning position P and the projection position The pinhole 32A through which the linear light flux 46 passing through Q has passed can be determined with higher accuracy than in the first embodiment.

  Hereinafter, in the same manner as in the first embodiment, the position determining unit 69 measures the scanning angle (scanning position P) of each linear light beam 46 with respect to the pinhole position W of the pinhole 32A first determined, and Based on the projection position Q and the device information 77, the pinhole 32A through which the linear light flux 46 transmitted through other than the optical center of the spectacle lens 102 is also determined. As a result, in the fourth embodiment, the pinhole 32A through which the linear light beam 46 projected on the screen 36 is transmitted and the pinhole position W can be determined with higher accuracy than in the first embodiment. Then, the position determination unit 69 sends, to the optical characteristic acquisition unit 70, pinhole position information 79 indicating the correspondence between the measured value of the scanning angle of each linear light beam 46 and the pinhole position W corresponding to each linear light beam 46. Output.

  Referring back to FIG. 18, the optical characteristic acquisition unit 70 of the fourth embodiment is the same as the first embodiment (see FIG. 11), but the projection position information 74 input from the position acquisition unit 68 and the position determination unit 69 The optical center position (optical axis OA) and optical characteristics of the spectacle lens 102 are acquired based on the pinhole position information 79 input from the device information 77 and the device information 77 in the storage unit 59. In this optical characteristic, in addition to the back focus Bf described in the first embodiment, the spherical dioptric power, cylindrical dioptric power (sphericity dioptric power), cylindrical axis angle (astigmatic axis angle), and prism of the spectacle lens 102 Values (prism power and prism base direction) and the like are included.

  The mapping image generation unit 416 calculates the optical characteristic of the spectacle lens 102 acquired by the optical characteristic acquisition unit 70 and the scanning angle (scanning position P) of each linear light beam 46 acquired from the projection position information 74 or the pinhole position information 79 or the like. Based on the measured values, a mapping image indicating the distribution of the optical characteristics of the spectacle lens 102 is generated by a known method. Then, the mapping image generation unit 416 outputs the mapping image to the storage unit 59 and the monitor 15.

  FIG. 21 is a flow chart showing a flow of generation of a mapping image by the lens characteristic measuring apparatus 10C of the fourth embodiment. As shown in FIG. 21, the processing from step S20 to step S22 is the same as that of the third embodiment shown in FIG. 17 described above, and thus the description thereof is omitted here. Step S20 corresponds to the light dividing step of the present invention, step S21 corresponds to the light receiving step of the present invention, and step S22 corresponds to the measured value acquiring step of the present invention.

  When step S22 is completed, as shown in FIG. 19 described above, the measured value acquiring unit 410 stores the measured values of the rocking angles θ and φ (scanning angles of the linear light beams 46) of the galvano mirrors 42A. The image information 72 in 59 is stored. As a result, in the image information 72, each captured image 52 is associated with the measured value of the scanning angle of the linear light beam 46 corresponding to each captured image 52.

  Next, the position acquisition unit 68 generates the projection position information 74 shown in FIG. 19 described above based on the image information 72 in the storage unit 59, and outputs the projection position information 74 to the position determination unit 69 (step S30, corresponding to the position acquisition step of the present invention).

  The position determination unit 69 that has received the input of the projection position information 74 first determines the measurement position of the scanning position P respectively corresponding to the measurement value of the scanning angle of each linear light beam 46 based on the projection position information 74. Next, the position determination unit 69 corresponds to the central portion of the spectacle lens 102 based on the measurement value of each scanning position P and the position coordinates of the projection position Q of the linear light beam 46 projected on the screen 36. The analysis of the scanning position P and the projection position Q and the discrimination of the pinhole 32A through which the linear light flux 46 corresponding to the scanning position P and the projection position Q is transmitted are performed.

  Then, based on the measured value of the scanning angle of each linear light beam 46, each projection position Q, and the device information 77, the position determination unit 69 determines the remaining position of the pinhole 32A determined first based on the pinhole position W of the pinhole 32A. The pinhole position W of the pinhole 32A through which the linear luminous flux 46 has passed is also determined.

  As described above, even when the reproducibility of the rocking angles θ and φ of the galvano mirrors 42A is low, the position discrimination unit 69 determines the pinholes 32A through which the linear light beams 46 are transmitted from the measured values of the scanning positions P and the like. The pinhole position W can be determined with high accuracy (step S31, corresponding to the position determination step of the present invention). Then, the position determination unit 69 outputs the pinhole position information 79 shown in FIG. 20 described above to the optical characteristic acquisition unit 70.

  The position determination unit 69 having received the input of the pinhole position information 79 determines the optical center position and the optical characteristic of the spectacle lens 102 based on the pinhole position information 79 and the projection position information 74 and the device information 77 described above. Acquire (Step S32, equivalent to the optical characteristic acquisition step of the present invention).

  Next, the mapping image generation unit 416 determines the optical characteristic of the spectacle lens 102 acquired by the optical characteristic acquisition unit 70 and the measured value of the scanning angle (scanning position P) of each linear light beam 46 acquired from the projection position information 74 or the like. Based on this, a mapping image of the spectacle lens 102 is generated, and this mapping image is output to the monitor 15 or the like (step S33).

  As described above, in the fourth embodiment, the measurement of the optical characteristics and the mapping image of the spectacle lens 102 is performed using the measured values of the scanning angles of the respective linear light beams 46 (swing angles θ and φ of the respective Galvano mirrors 42A). Can. As a result, even when the reproducibility of the rocking angles θ and φ of the galvano mirrors 42A is low, the fluctuation of the rocking angles θ and φ is reflected in the measurement result of the optical characteristics of the spectacle lens 102 and the mapping image. It is prevented. This makes it possible to improve the measurement accuracy of the optical characteristics of the spectacle lens 102 and the reproducibility of the mapping image for the same spectacle lens 102.

[Others]
In the above embodiments, while the linear luminous flux 46 scans the surface of the spectacle lens 102, the light quantity of the linear luminous flux 46 is constant. For example, the light source 40 according to the scanning angle of the linear luminous flux 46 The light amount (brightness) of the linear light beam 46 emitted from the light source may be adjusted. Specifically, the linear luminous flux 46 is set such that the light quantity of the linear luminous flux 46 irradiated to the central part of the spectacle lens 102 is low and the luminous quantity of the linear luminous flux 46 irradiated to the peripheral part of the spectacle lens 102 is high. Adjust the amount of light. Thereby, the brightness of the linear luminous flux 46 at the central portion and the peripheral portion of the photographed image 52 can be uniformly adjusted.

  In each of the above embodiments, the imaging condition of the camera 50 is fixed while scanning the surface of the eyeglass lens 102 with the linear light beam 46. For example, the linear light beam 46 scans the central portion of the eyeglass lens 102 The imaging condition of the camera 50 may be changed in the case where the lens 50 is moving and in the case where the linear light beam 46 scans the peripheral portion of the spectacle lens 102. The imaging conditions are, for example, the exposure (accumulation) time, gain, and the like of the imaging device 50B of the camera 50.

  When only the amount of prisms of the spectacle lens 102 is measured in the lens characteristic measuring apparatus 10 or the like of each of the above embodiments, the linear luminous flux 46 along the photographing optical axis OB is not scanned by the scanner 42. Only the spectacle lens 102 may be irradiated.

  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 ... lens characteristic measuring device,
32 ... Hartmann Plate,
32A ... Pinhole,
35 ... scanning optical system,
36 ... screen,
37 ... shooting optical system,
40 ... light source,
42 ... Scanner,
46 ... linear luminous flux,
50 ... camera,
52 ... shooting image,
58 ... General control unit,
62: Optical system control unit,
64: Shooting control unit,
68 ... location acquisition unit,
69 ... position discrimination unit,
70: Optical property acquisition unit,
88 ... Scan setting unit,
90 ... point image number adjustment unit,
101 ... glasses frame,
102 ... glasses lens

Claims (12)

A scanning optical system for scanning the surface of the lens to be inspected with a linear light beam;
A Hartmann plate provided on a side opposite to the scanning optical system with respect to the test lens and having a plurality of two-dimensionally arranged pinholes, wherein the test lens is scanned by the scanning optical system A Hartmann plate that transmits the linear light flux that has been transmitted to the pinholes.
A screen onto which the linear luminous flux transmitted through the Hartmann plate is projected;
An imaging optical system provided on the opposite side to the Hartmann plate with respect to the screen and performing imaging of the screen while the linear optical beam is being scanned by the scanning optical system;
Lens characteristic measuring device provided with A position acquisition unit that analyzes a photographed image of the screen photographed by the photographing optical system and acquires a projection position of the linear light beam projected on the screen;
A position determination unit that determines a pinhole position of the pinhole through which the linear light beam projected on the screen is transmitted;
Based on the projection position acquired by the position acquisition unit, the result of discrimination of the pinhole position by the position discrimination unit, and the positional relationship between the known lens to be examined, the Hartmann plate, and the screen, An optical characteristic acquisition unit that acquires optical characteristics of the inspection lens;
The lens characteristic measurement device according to claim 1, comprising:   The position determination unit is a projection position of the linear light beam acquired by the position acquisition unit, and a scanning angle of the linear light beam by the scanning optical system and of the linear light beam projected on the projection position The lens characteristic measurement device according to claim 2, wherein the pinhole position is determined based on a scanning angle. A light dividing portion provided on an optical path of the linear luminous flux from the scanning optical system to the surface of the lens to be measured and dividing a part of the linear luminous flux;
A light receiving optical system that receives the linear light beam divided by the 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;
Equipped with
The lens characteristic measurement device according to claim 3, wherein the position determination unit determines the pinhole position based on the projection position of the linear light beam and the measurement value of the scanning angle acquired by the measurement value acquisition unit. .   Based on the optical characteristic of the subject lens acquired by the optical characteristic acquisition unit and the measured value of the scanning angle acquired by the measured value acquisition unit, a mapping image showing the distribution of the optical characteristic of the subject lens is obtained. The lens characteristic measuring device according to claim 4 provided with a mapping image generation part to generate. The pinholes are two-dimensionally arranged at equal intervals on the Hartmann plate,
The scanning optical system adjusts the diameter of the linear light beam to be smaller than the diameter of the pinholes on the Hartmann plate and smaller than the distance between the pinholes adjacent to each other. The lens characteristic measuring device according to any one of the above.   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 light beam and a type of 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. An optical system control unit configured to scan the surface of the test lens with the linear light beam by controlling a scanning angle of the linear light beam emitted from the scanning optical system;
A light dividing portion provided on an optical path of the linear luminous flux from the scanning optical system to the surface of the lens to be measured and dividing a part of the linear luminous flux;
A light receiving optical system that receives the linear light beam divided by the 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 Hartmann plate disposed on one side of a subject lens and having a plurality of two-dimensionally arranged pinholes, a screen provided on the opposite side to the subject lens with respect to the Hartmann plate, and a screen with respect to the screen And an imaging optical system provided on the opposite side to the Hartmann plate for imaging the screen.
A scanning optical system disposed on the other surface side opposite to the one surface side of the test lens, scanning the surface of the test lens with a linear light beam;
And a step of photographing the screen on which the linear light flux transmitted through the subject lens and the pinhole is projected while the scanning optical system is executing scanning of the linear light flux. ,
Method of operating a lens characteristic measuring device having: A position acquisition step of analyzing a photographed image of the screen photographed by the photographing optical system and acquiring a projection position of the linear light beam projected on the screen;
A position determining step of determining a pinhole position of the pinhole through which the linear light beam projected on the screen is transmitted;
Based on the projection position acquired in the position acquisition step, the result of discrimination of the pinhole position in the position discrimination step, and the positional relationship between the known lens to be examined, the Hartmann plate, and the screen An optical characteristic acquisition step of acquiring an optical characteristic of the test lens;
Have
The position determining step may be a projection position of the linear light beam acquired in the position acquisition step, and a scanning angle of the linear light beam by the scanning optical system and of the linear light beam projected on the projection position The position of the pinhole is determined based on the scanning angle,
A light dividing step of dividing the part of the linear luminous flux provided in the middle 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 beam divided in the light dividing step by a light receiving optical system;
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 by the light reception optical system;
Have
The lens characteristic measurement according to claim 10, wherein the position determining step determines the pinhole position based on the projection position of the linear light beam and the measurement value of the scanning angle acquired in the measurement value acquiring step. Method of operation of the device. The lens characteristic measurement device 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;
The operating method of the lens characteristic measuring apparatus according to claim 10 or 11, comprising