JP2018163104A - Lens meter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lens meter capable of adjusting a position of a test lens while grasping an actual posture of the test lens on a display unit. SOLUTION: A measurement optical system 20 that projects measurement light onto a test lens L and receives the measurement light transmitted through the test lens L, and an optical characteristic value of the test lens L based on the received measurement light. Acquires the control unit 41 that calculates and controls the measurement optical system 20, the display unit 12 that displays the calculated optical characteristic value under the control of the control unit 41, and the lens image IL of the lens L to be measured. A lens meter 10 including an imaging unit 30. The control unit 41 superimposes the lens image IL acquired by the imaging unit 30 on the display unit 12 to display the lens area symbol Oa indicating the area in which the lens L to be examined exists. [Selection diagram] Fig. 3

Description

  The present disclosure relates to a lens meter.

  A lens meter is known for measuring optical characteristic values such as spherical power, cylindrical power (astigmatism power), cylinder axis angle (astigmatism axis angle), prism value (prism power and prism base direction), etc. (For example, refer to Patent Document 1).

  In this lens meter, a cylinder axis angle, a prism base direction, and the like are measured based on the posture of the lens to be examined at the time of measurement. For this reason, the lens meter assists the test lens to be in a predetermined posture by pressing the periphery of the test lens against the lens table during measurement.

JP-A-11-132905

  Here, the posture of the test lens changes according to the manner in which the peripheral edge is pressed against the lens table. In the lens meter described above, in order to appropriately measure the optical characteristic value, it is necessary to adjust the position by moving the lens to be examined while looking at the display unit. For this reason, in the case of an unfamiliar user, it may be necessary to move the test lens while looking at the display unit while confirming the manner in which the actual test lens is pressed against the lens table.

  The present disclosure has been made in view of the above circumstances, and an object thereof is to provide a lens meter capable of adjusting the position of a test lens while grasping the actual posture of the test lens on a display unit. To do.

  In order to solve the above-described problems, a lens meter according to the present disclosure is based on a measurement optical system that projects measurement light onto a test lens and receives measurement light transmitted through the test lens, and the received measurement light. A control unit that calculates an optical characteristic value of the lens to be measured and controls the measurement optical system, a display unit that displays the calculated optical characteristic value under the control of the control unit, and the object under measurement. An image pickup unit that acquires a lens image of the test lens, and the control unit overlaps the lens image acquired by the image pickup unit and displays a lens region symbol indicating a region where the test lens exists in the display unit. To display.

  According to the lens meter of the present disclosure, the position of the test lens can be adjusted while grasping the actual posture of the test lens on the display unit.

It is explanatory drawing which shows the whole structure of the lens meter of Example 1 as an example of the lens meter which concerns on this indication. It is explanatory drawing which shows the structure of the measurement optical system of a lens meter. It is explanatory drawing which shows the structure of the pattern plate of a measurement optical system. It is a block diagram which shows the structure of the control system of a lens meter. It is a flowchart which shows the display process (display method) performed by the control part of a lens meter. It is a flowchart which shows the production | generation process (generation method) performed by the image generation part of the control part of a lens meter. It is explanatory drawing which shows a mode that the superimposed image produced | generated by superimposing each object image on a lens image was displayed in the display part of the lens meter. It is explanatory drawing which shows a mode that the measurement optical axis symbol and the lens optical axis symbol were approached from the state shown in FIG. It is explanatory drawing which shows a mode that the measurement optical axis symbol and the lens optical axis symbol were matched from the state shown in FIG. It is explanatory drawing which shows a mode that the superimposition image which remove | eliminated the annular line symbol (lens area | region symbol) from the lens image was displayed on the display part in the state shown in FIG. It is explanatory drawing which shows a mode that the superimposition image which superimposed the filling symbol as a lens area | region symbol was displayed.

  Hereinafter, embodiments of a lens meter according to the present disclosure will be described with reference to the drawings.

A lens meter 10 of Example 1 as an embodiment of a lens meter according to the present disclosure will be described with reference to FIGS. 1 to 11. First, the configuration of the lens meter 10 according to the first embodiment will be described.
"overall structure"

  The lens meter 10 has an apparatus main body 11 as shown in FIG. In the apparatus main body 11, a display unit 12 made of a liquid crystal display, an organic EL display, or the like and formed as a touch panel type display screen 12 a is provided at the upper front. On the display screen 12a, an object image IO, which will be described later, showing the optical characteristic values (spherical power, cylindrical power, cylindrical shaft angle, prism power, prism base direction, etc.) of the test lens L (see FIG. 3) was captured. A test lens image IL (hereinafter simply referred to as a lens image IL) of the test lens L, a superimposed image IS in which the object image IO is superimposed on the lens image IL, and the like are displayed (see FIG. 7 and the like). Further, on the display screen 12a, a mode switching button for switching the measurement mode, a measurement button for performing an operation such as start and stop of measurement, a measurement result and the like on a printing unit 42 (see FIG. 4) described later. An operation unit 13 is displayed that shows various operation buttons such as operation buttons for printing with icons (see FIG. 7 and the like). The operation unit 13 may be configured by appropriately providing buttons, switches, and the like on the apparatus main body 11, and is not limited to the configuration of the first embodiment.

  In the apparatus main body 11, below the display unit 12, optical member storage units 11 a and 11 b that store various optical members of the measurement optical system 20 (see FIG. 2) are arranged vertically. The optical member storage unit 11a is provided to extend below the display unit 12, and stores the light projecting optical system 21 and the imaging unit 30 (see FIG. 2). The optical member storage portion 11b is provided below and spaced from the optical member storage portion 11a, and stores the light receiving optical system 22 (see FIG. 2). A lens receiver 14 is integrally provided at the upper end of the optical member storage portion 11b so as to have a truncated cone shape on which the lens L to be tested is placed.

  A lens table 15 is provided at a position behind the lens receiver 14 on the front surface of the apparatus main body 11. The lens table 15 can be adjusted in position in the front-rear direction by rotating the operation lever 15a at a position where the lens L to be tested placed on the lens receiver 14 is pressed. As the test lens L, a circular unprocessed lens, a lens ground for spectacles, a lens framed in a spectacle frame, or the like is applied. In order to increase the measurement accuracy of the optical characteristic value, the test lens L is pressed against the lens table 15 so that the lens optical axis Ll coincides with a measurement optical axis Lm of the measurement optical system 20 described later. The position on the receiver 14 is adjusted (see FIG. 2). The lens optical axis Ll is an optical center position of the lens L to be measured, and is a position where incident light passes without being refracted (position where the prism value is 0).

  In the apparatus main body 11, a lens pressing member 16 and a marking device 17 are provided below the optical member storage portion 11a. The lens pressing member 16 fixes the test lens L by pressing the test lens L arranged on the lens receiver 14 from above. The marking device 17 marks the fixed lens L by operating the lever member 17a.

[Configuration of optical system]
The lens meter 10 has a measurement optical system 20 for measuring the optical characteristic value of the lens L to be examined. The measurement optical system 20 includes a light projecting optical system 21 and a light receiving optical system 22 as shown in FIG.

  The light projecting optical system 21 is an optical system that projects measurement light onto the lens L, and is housed in the optical member housing portion 11a (see FIG. 1). The light projecting optical system 21 includes a light source 21a, a half mirror 21b, and a lens 21c. The light source 21a emits measurement light and is an LED (light emitting diode) in the first embodiment. The light projecting optical system 21 extends from the light source 21a to the half mirror 21b, has a measurement optical axis Lm of the measurement optical system 20 that is folded back by the half mirror 21b, and a lens 21c is provided on the measurement optical axis Lm. Yes. The measurement optical axis Lm is in a positional relationship passing through the center of an opening 14a (see FIG. 1) provided at the upper end of the lens receiver 14. The light projecting optical system 21 passes the measurement light emitted from the light source 21a through the half mirror 21b and the lens 21c so as to be parallel light having a predetermined aperture and is applied to the test lens L disposed on the lens receiver 14. Flood light.

  The light receiving optical system 22 is an optical system that receives measurement light that has passed through the lens L to be measured, and is housed below the lens receiver 14 in the optical member housing portion 11b (see FIG. 1). The light receiving optical system 22 includes a filter 22a, a pattern plate 22b, and a measurement light receiving element 22c on the measurement optical axis Lm extending from the light projecting optical system 21 through the opening 14a (see FIG. 1) of the lens receiver 14. The pattern plate 22b is a pattern plate that separates the measurement light that has passed through the test lens L into a plurality of divided measurement light beams. As shown in FIG. 3, the pattern plate 22 b is formed by providing a plurality of circular openings 22 d arranged at predetermined intervals in the vertical and horizontal directions (two-dimensionally). In the first embodiment, seven pattern openings 22 d are provided. Is provided. The light receiving optical system 22 separates (converts) the measurement light transmitted through the test lens L into a plurality of divided measurement light beams through the filter 22a and the pattern plate 22b, and causes the measurement light receiving element 22c to receive the light.

  The measurement light receiving element 22c receives the plurality of divided measurement light beams, converts them into electrical signals (image signals), and outputs them. This image signal includes information indicating the light receiving position and the shape of the received light image for each of the plurality of split measurement light beams received. This information is expressed as position coordinates on the pixel of the measurement light receiving element 22c. Here, since each of the divided measurement light beams has its light receiving position on the measurement light receiving element 22c displaced according to the optical characteristic value of the lens L to be measured, the pattern formed on the measurement light receiving element 22c is reduced or reduced. Enlarged or distorted. The lens meter 10 according to the first embodiment (the control unit 41 (optical characteristic calculation unit 44) described later) obtains the optical characteristic value of the lens L to be analyzed by analyzing the projection patterns of the plurality of divided measurement light beams.

  In the first embodiment, in the light projecting optical system 21 of the measurement optical system 20, the imaging unit 30 (imaging device) is provided on a straight line that passes through the half mirror 21b from the lens 21c. The imaging unit 30 is, for example, a monocular digital camera, and includes an imaging optical system 31 and an imaging element 32. The imaging optical system 31 is composed of a plurality of lenses, and in cooperation with the lens 21 c of the light projecting optical system 21, forms a subject image of the lens L to be tested placed on the lens receiver 14 on the imaging element 32. . In the first embodiment, the imaging optical system 31 is capable of photographing a square area having a side of 100 mm with the measurement optical axis Lm as the center along a plane parallel to the horizontal plane on the lens receiver 14. The imaging element 32 converts the subject image formed by the imaging optical system 31 into an electrical signal (image signal) and outputs the electrical signal.

[Control system configuration]
In the lens meter 10, as shown in FIG. 4, the display unit 12, the operation unit 13, the light source 21 a of the light projecting optical system 21, and the light receiving optical system are added to the control unit 41 that comprehensively controls each unit of the lens meter 10. In addition to the 22 measurement light receiving elements 22 c and the image pickup device 32 of the image pickup unit 30, a print unit 42 and a storage unit 43 are connected. The control unit 41 performs various controls according to operations performed on the operation unit 13 by developing a control program stored in the internal memory 41a or the storage unit 43 on, for example, a RAM (Random Access Memory). In the first embodiment, the internal memory 41a is configured by a RAM or the like, and the storage unit 43 is configured by a ROM (Read Only Memory), an EEPROM (Electrically Erasable Programmable ROM), or the like. Various controls include control of the imaging unit 30 (imaging element 32) for obtaining a lens image IL (still image or moving image) that is an image of the lens L, and each divided measurement light beam that has passed through the lens L. There is control of the measurement optical system 20 (the light source 21a and the light receiving element 22c for measurement) for acquiring a pattern formed by. Further, as control, display control on the display unit 12 (display screen 12a), print control for printing the optical characteristic value of the lens L to be tested by the printing unit 42, and storage of various data in the storage unit 43. There is control of processing and reading processing from the storage unit 43. The control unit 41 also functions as an optical characteristic calculation unit 44 and an image generation unit 45 in addition to the above-described controls.

  The optical characteristic calculation unit 44 is based on an image signal input from the measurement light receiving element 22c of the light receiving optical system 22, that is, based on the images of a plurality of divided measurement light beams imaged on the measurement light receiving element 22c. Optical characteristic values such as spherical power, cylindrical power, cylindrical shaft angle, prism power, prism base direction, etc. are calculated at the measurement points. The optical characteristic calculation unit 44 receives light receiving positions (data indicating coordinates of each divided measurement light beam on the light receiving surface of the measurement light receiving element 22c) included in the image signal from the measurement light receiving element 22c, and The shape of the received light image (data indicating the shape of the light receiving point of each divided measurement light beam) is analyzed and acquired. Then, the optical characteristic calculation unit 44 determines the acquired light receiving position and the shape of the received light image as the light receiving position of each divided measurement light beam and the shape of the received light image of each divided measurement light beam when the test lens L is not mounted. By comparing, the optical characteristic value of each measurement position of the lens L to be measured is obtained. The light receiving position of each divided measurement light beam and the shape of the received light image of each divided measurement light beam when the test lens L is not mounted are measured in advance and stored in a control program in the internal memory 41a or the storage unit 43. Has been.

  The image generation unit 45 includes a measurement optical axis symbol Oo indicating the position of the measurement optical axis Lm of the measurement optical system 20 as an object image IO to be displayed on the display screen 12a in order to assist the measurement of the test lens L, A lens optical axis symbol Ol indicating the position of the lens optical axis Ll of the analyzing lens L, a prism circle symbol Op (hereinafter referred to as a P circle symbol Op) indicating the amount of prisms in stages, and an image showing each symbol) (See FIG. 7 and the like). The measurement optical axis symbol Oo is the optical axis center position of the lens meter 10 (measurement optical system 20), that is, the position where the measurement optical axis Lm exists if the measurement optical system 20 does not have the test lens L (by the pattern plate 22b). In the first embodiment, it is shown as the center of the P circle symbol Op.

  The lens optical axis symbol Ol indicates the position of the lens optical axis Ll of the lens L to be examined, and is a cross symbol in the first embodiment. The lens optical axis symbol Ol functions as a lens position symbol indicating the position of the lens L to be detected by indicating the position of the lens optical axis Ll.

  The P circle symbol Op indicates the amount of prism at a position located on the measurement optical axis Lm of the test lens L in a stepwise manner with the measurement optical axis Lm as the center. In the first embodiment, the P circle symbol Op is a symbol of a plurality of concentric circles such that the same prism value is centered around the position of the measurement optical axis Lm in a circle, and the more the prism value is, the more outward the position is. .

  In the first embodiment, the image generating unit 45 increases the position of the measurement optical axis Lm (measurement optical axis symbol Oo) when the measurement optical axis symbol Oo and the lens optical axis symbol Ol approach each other as described later. The match symbol Om (image showing the symbol) surrounded by the divided thick frame is displayed in green (see FIG. 8). Further, in the first embodiment, when the measurement optical axis symbol Oo and the lens optical axis symbol Ol match, the image generation unit 45 displays the match symbol Om in pink and displays a line extending horizontally in the lens optical axis symbol Ol. It is assumed that it extends to the end of the circle symbol Op (see FIG. 9). If the match symbol Om assists the operation of matching the measurement optical axis symbol Oo and the lens optical axis symbol Ol, this color and display mode may be set as appropriate. It is not limited. In addition, the match symbol Om may be enlarged together with the lens optical axis symbol Ol and displayed on the display screen 12a. With this configuration of enlargement, an operation for matching the measurement optical axis symbol Oo and the lens optical axis symbol Ol can be made easier as will be described later.

  The image generation unit 45 also generates a measurement value display Ov (an image showing each value) as an object image IO for displaying the optical characteristic value of the lens L to be measured calculated by the optical characteristic calculation unit 44. In the measurement value display Ov, the spherical power, the cylindrical power, and the shaft angle, which are optical characteristic values of the lens L to be measured, are displayed on the right side of the symbol “S, C, A” at the right end of the display screen 12a. In the measurement value display Ov, the prism power and the prism base direction, which are optical characteristic values of the lens L to be measured, are displayed on the right side of the symbols “ΔP, ΔB” at the right end of the display screen 12a.

  Further, the image generation unit 45 captures the lens image IL of the lens L to be measured captured by the imaging unit 30 from the imaging signal input from the imaging element 32 of the imaging unit 30, that is, the subject image photoelectrically converted by the imaging element 32. Generate. The image generation unit 45 performs necessary processing and processing (for example, coordinate conversion, contrast adjustment, color conversion (such as translucent or sepia color), brightness adjustment, and filter for the image captured by the imaging unit 30. And the like to generate a desired lens image IL. In the first embodiment, the image generation unit 45 suppresses the brightness of the lens image IL or makes it thin (for example, semi-transparent or sepia) so that the lens image IL is less noticeable than the object image IO. Is generated.

  Here, when the lens image IL is generated, since the lens pressing member 16 presses the test lens L from above, it is conceivable that the lens pressing member 16 appears on the test lens L. For this reason, in the lens meter 10 according to the first embodiment, the lens pressing member 16 is formed by combining a thin plate-like member as viewed from above, in which the lens pressing member 16 is formed of sheet metal or the like, so that the reflection of the lens pressing member 16 is minimized. I keep it on. In particular, in the imaging unit 30 of the first embodiment, since the lens receiver 14 is focused, the lens pressing member 16 that presses the lens L from above is not focused, and a thin plate-like member is used. As a result, the reflection of the lens pressing member 16 can be substantially eliminated. As a configuration for eliminating the reflection, since the region where the lens pressing member 16 is captured is known in advance, the image generating unit 45 may erase it by image processing, or the lens pressing member 16 may be formed of a transparent member. Other configurations may be used and the configuration is not limited to the configuration of the first embodiment. In the lens images IL of FIGS. 7 to 11, the lens receiver 14 and the lens pressing member 16 are omitted for easy understanding.

  The image generation unit 45 detects a region where the lens L to be detected exists, that is, the shape of the lens L and the coordinate position on the image from the acquired lens image IL, and A lens area symbol Oa indicating an area where the lens L exists is generated. In the first embodiment, the lens region symbol Oa is an annular line symbol Ob (see FIG. 7 and the like) surrounding the lens L to be measured along the outer edge. The image generation unit 45 detects the outer edge of the lens L to be detected from the lens image IL by a known technique (for example, detecting features such as edges (contours), corners, and points by contrast adjustment, shape matching, and the like). The image generation unit 45 assigns and sets a plurality of curves that are approximated over the entire circumference of the detected outer edge, sets intersections of the curves, and sets the positional relationship between the curves and the intersections in the internal memory 41a or the storage unit. 43 is stored. Then, the image generation unit 45 extracts the coordinates of each intersection set on the outer edge of the lens L from the lens image IL, and connects them with the set curves to form a single annular line. A line symbol Ob is generated.

  When the test lens L has a plurality of focal points, the image generating unit 45 displays at least one of a plurality of focal region symbols indicating regions corresponding to the respective focal points as the lens region symbol Oa on the display unit 12 ( It is generated for display on the display screen 12a). For example, when the lens L to be examined is a bifocal lens, the image generation unit 45 uses, as the lens region symbol Oa, the distance portion region symbol Oaf indicating the distance portion and the near portion region symbol indicating the near portion. Oan and two focus area symbols are generated. This bifocal lens refers to a lens (see FIG. 10 and the like) in which a near portion (so-called small ball) having a different focal point is provided inward of a lens serving as a distance portion. In the first embodiment, the image generation unit 45 generates a first annular line symbol Ob1 that surrounds the outer edge of the distance portion as the distance portion region symbol Oaf, and surrounds the outer edge of the near portion as the near portion region symbol Oan. A two-ring line symbol Ob2 is generated (see FIG. 7 and the like). The first annular line symbol Ob1 can be generated in the same manner as the annular line symbol Ob because the outer edge of the lens L to be tested is the outer edge of the distance portion. Further, the second annular line symbol Ob2 is generated in the same manner as the annular line symbol Ob by detecting the outer edge of the near portion provided inward of the lens L from the lens image IL by a known technique. Can do.

  In addition, when the lens L to be tested is a trifocal lens provided with a distance portion, a near portion, and an intermediate portion therebetween, as the lens region symbol Oa (focus-specific region symbol), The distance part region symbol Oaf (first annular line symbol Ob1) and the near part region symbol Oan (second annular line symbol Ob2) are generated, and the intermediate region symbol (third annular line symbol) is generated. This intermediate area symbol (third annular line symbol) is obtained by detecting the outer edge of the intermediate portion provided inward of the lens L from the lens image IL by a well-known technique. Or the near-field part symbol.

  Each focal region symbol (distance portion region symbol Oaf (first annular line symbol Ob1), near portion region symbol Oan (second annular line symbol Ob2) and intermediate portion region symbol (third annular line symbol)) All of the single test lens L having a plurality of focal points may be generated and displayed on the display unit 12 (see FIG. 7), and an arbitrary number may be generated and displayed on the display unit 12. You may let them. For example, in the case of a bifocal lens, this arbitrary number refers to generation and display of only one of the distance portion region symbol Oaf and the near portion region symbol Oan. It means generating and displaying one or two of the partial area symbol Oaf, the near partial area symbol Oan, and the intermediate partial area symbol. And the lens meter 10 can improve the usability by enabling the designation (including the setting of the number of items) to be displayed on the display unit 12 among the area-specific symbols for each focus.

  The image generation unit 45 superimposes the object image IO, that is, the measurement optical axis symbol Oo, the lens optical axis symbol Ol, the P circle symbol Op, the measurement value display Ob, and the annular line symbol Ob, on the lens image IL, and generates a superimposed image IS. Generate. Here, since the imaging unit 30 is provided on the measurement optical axis Lm of the measurement optical system 20, the center position of the image of the lens image IL coincides with the position of the measurement optical axis Lm. For this reason, the image generation unit 45 superimposes the measurement optical axis symbol Oo on the center position in the lens image IL and also superimposes the P circle symbol Op on the center. The image generation unit 45 superimposes the lens optical axis symbol Ol on the position where the prism value of the lens L to be measured becomes 0 according to the light receiving position of the measurement light in the light receiving element 22c for measurement of the light receiving optical system 22, The measured value display Ov is superimposed on the right side of the. In the first embodiment, the image generation unit 45 is in a direction in which there is a position where the prism value of the test lens L is 0 with respect to the measurement optical axis Lm (measurement optical axis symbol Oo), and is on the P circle symbol Op. The lens optical axis symbol Ol is displayed at the position indicating the prism value at the location measured in (1). Thereby, the image generation unit 45 generates a superimposed image IS in which each object image IO is superimposed on the lens image IL.

  The control unit 41 outputs the superimposed image IS (its data) generated by the image generation unit 45 to the display unit 12 for display on the display screen 12a (see FIG. 7 and the like). In the display screen 12a, the image generation unit 45 and the control unit 41 repeatedly perform the above-described operation, so that the lens image IL showing how the test lens L is moved and the lens according to the position of the test lens L are displayed. A lens optical axis symbol Ol indicating the movement of the optical axis Ll is displayed as a real-time moving image (see FIG. 7 and the like).

[Image control processing configuration]
Next, display processing (display method) for displaying the superimposed image IS under the control of the control unit 41 in the lens meter 10 will be described with reference to FIG. This display process is executed by the control unit 41 based on a program stored in the internal memory 41 a or the storage unit 43. Below, each step (each process) of the flowchart of this FIG. 5 is demonstrated. The flowchart of FIG. 5 is started when measurement of the test lens L is started in the lens meter 10.

  In step S1, acquisition of a lens image IL that is an image of the lens L to be examined by the imaging unit 30 is started, and the process proceeds to step S2.

  In step S2, various data are acquired, and the process proceeds to step S3. In step S2, measurement data of the lens L to be measured from the measurement optical system 20 and data for the lens image IL from the imaging unit 30 are acquired.

  In step S3, each optical characteristic value of the test lens L is calculated, and the process proceeds to step S4. In step S3, the optical characteristic calculation unit 44, based on the measurement data of the test lens L, that is, the image signal input from the measurement light receiving element 22c, the spherical power, the cylindrical power, and the cylindrical axis at the measurement location of the test lens L. Optical characteristic values such as angle, prism power, and prism base direction are calculated.

  In step S4, each object image IO is generated, and the process proceeds to step S5. In step S4, the image generation unit 45 generates the measurement optical axis symbol Oo, the lens optical axis symbol Ol, the P circle symbol Op, the measurement value display Ov, and the annular line symbol Ob as the object image IO. Here, as will be described later, the image generation unit 45 also appropriately generates a match symbol Om according to the degree of approach between the measurement optical axis symbol Oo and the lens optical axis symbol Ol.

  In step S5, a superimposed image IS in which each object image IO is superimposed on the lens image IL is generated, and the process proceeds to step S6. In step S5, the image generation unit 45 generates a lens image IL, and the lens image IL includes a measurement optical axis symbol Oo, a lens optical axis symbol Ol, a P circle symbol Op, and a measurement value display Ov as each object image IO. And the annular line symbol Ob (and the matching symbol Om in some cases) are superimposed to generate a superimposed image IS.

  In step S6, the superimposed image IS is displayed on the display unit 12 (its display screen 12a), and the process proceeds to step S7.

  In step S7, it is determined whether or not the measurement of the test lens L has been completed. If YES, the process proceeds to step S8. If NO, the process returns to step S2. In step S7, the determination as to whether or not the measurement has been completed is terminated when, for example, an operation signal for ending the measurement is received from the operation unit 13 or the lens L to be measured is removed from the lens receiver 14. In other cases, it is determined that the process has not ended. Whether or not this measurement has been completed is determined by an operation signal for causing the printing unit 42 to print each optical characteristic value of the lens L acquired from the operation unit 13 or transmitting the data to the outside. If received, it may be determined to be terminated, and is not limited to the configuration of the first embodiment.

  In step S8, the acquisition of the lens image IL that is the image of the lens L to be examined by the imaging unit 30 is terminated, and the eye information acquisition process is terminated. In step S8, the positional relationship (data) of each curve and each intersection set corresponding to the acquired lens image IL and stored in the internal memory 41a or the storage unit 43 may be discarded.

  Next, generation processing (generation method) (step S4 in the flowchart of FIG. 5) in which the image generation unit 45 generates each object image IO in the lens meter 10 will be described with reference to FIG. Below, each step (each process) of the flowchart of this FIG. 6 is demonstrated.

  In step S11, it is determined whether or not each curve and each intersection is set for the acquired lens image IL. If YES, the process proceeds to step S12. If NO, the process proceeds to step S13. In step S11, a plurality of curves that approximate the entire circumference of the outer edge of the lens L to be measured are assigned and set to the lens image IL that has been acquired in step S1 of the flowchart of FIG. It is determined whether or not is set. This determination can be made, for example, by checking whether or not the internal memory 41a or the storage unit 43 stores the positional relationship between each curve and each intersection corresponding to this lens image IL.

  In step S12, a plurality of curves and their intersections are set for the acquired lens image IL, and the process proceeds to step S13. In step S12, a plurality of curves that approximate the entire circumference of the outer edge of the lens L to be measured are assigned and set to the lens image IL that has been acquired in step S1 of the flowchart of FIG. Are stored in the internal memory 41a or the storage unit 43.

  In step S13, a ring line symbol Ob is generated, and the process proceeds to step S14. In step S13, the coordinates of each intersection set on the outer edge of the lens L to be examined are extracted from the lens image IL at this time point, and connected with each set curve to form one annular line. An annular line symbol Ob corresponding to the position of the lens L in the lens image IL at the time is generated.

  In step S14, each object image IO other than the annular line symbol Ob is generated, and this generation process is terminated. In step S14, a measurement optical axis symbol Oo, a lens optical axis symbol Ol, a P circle symbol Op, and a measurement value display Ov are generated, and the generation process is terminated. In step S14, the coincidence symbol Om is appropriately generated according to the interval (distance) between the measurement optical axis symbol Oo and the lens optical axis symbol Ol. That is, in step S14, if they are far away, the match symbol Om is not generated, but if they are close (for example, closer than a predetermined distance (first distance)), a green match symbol Om is generated and they match (strictly). The matching symbol Om is generated in pink when the distance is not limited to a match in a particular sense (including closer than a predetermined distance (second distance)).

  Next, an example of the operation at the time of measuring the optical characteristic value of the lens L in the lens meter 10 will be described. The user (examiner) operates the lens meter 10 to start measurement of the test lens L with the operation unit 13, and places the test lens L on the lens receiver 14 while placing the test lens L on the lens receiver 14. The peripheral edge is pressed against the lens table 15. In Example 1, a pair of lenses configured as edgeless glasses (two points) using a bifocal lens as shown in FIG.

  Then, the lens meter 10 executes the display process shown in the flowchart of FIG. 5 and proceeds from step S1 to S2 to S3 to calculate each optical characteristic value of the lens L to be measured, and proceeds to step S4. An object image IO is generated. Then, since the image generation unit 45 does not set each curve and each intersection point for the lens image IL that captures the measurement of the lens L to be measured, in the generation process shown in the flowchart of FIG. Proceeding from step S11 to S12, a plurality of curves are set over the entire circumference of the outer edge of the lens L, and the intersections of the curves are set. Then, the image generation unit 45 proceeds to step S13 in the flowchart of FIG. 6, and generates an annular line symbol Ob that matches the lens image IL at this time. Here, in this example, since the test lens L is a bifocal lens, the first annular line symbol Ob1 surrounding the outer edge of the distance portion and the outer edge of the near portion are surrounded as the annular line symbol Ob. A second annular line symbol Ob2 is generated (see FIG. 7 and the like).

  Further, since the measurement optical axis symbol Oo and the lens optical axis symbol Ol are far from each other when the measurement of the lens L is started, the image generation unit 45 proceeds to step S14 in the flowchart of FIG. Without generating the measurement optical axis symbol Oo, the lens optical axis symbol Ol, the P circle symbol Op, and the measurement value display Ov. Then, by proceeding from step S5 to S6 in the flowchart of FIG. 5, as shown in FIG. 7, the measurement optical axis symbol Oo, the lens optical axis symbol Ol, and the P circle symbol Op as each object image IO are included in the lens image IL. And the measurement value display Ov and the annular line symbol Ob are displayed on the display screen 12a, and the process proceeds from step S7 to S2 to repeat the above operation.

  The user moves the test lens L on the lens receiver 14 together with the lens table 15 so that the measurement optical axis symbol Oo and the lens optical axis symbol Ol are close to each other while viewing the display screen 12a. At this time, on the display screen 12a, a state in which the lens L and its peripheral edge are pressed against the lens table 15 in the lens image IL is shown, and an annular line symbol Ob superimposed on the lens image IL is displayed. It is projected. Therefore, the user can easily and appropriately grasp the posture of the lens L and how the lens L contacts the lens table 15 only by looking at the display screen 12a. While grasping the posture of L, the work of adjusting the position of the test lens L by bringing the measurement optical axis symbol Oo and the lens optical axis symbol Ol close to each other can be facilitated.

  Thereafter, the image generation unit 45 sets each curve and each intersection in the lens image IL, so in the generation processing shown in the flowchart of FIG. 6, the process proceeds from step S11 to S13 to S14, and the lens image at that time point An annular line symbol Ob (first annular line symbol Ob1 and second annular line symbol Ob2) corresponding to IL is generated. For this reason, since it is not necessary to set each curve and each intersection in the lens image IL after the second time, the image generation unit 45 can easily generate the annular line symbol Ob.

  Then, when the measurement optical axis symbol Oo and the lens optical axis symbol Ol approach each other, the image generation unit 45 generates a green match symbol Om in step S14 of the flowchart of FIG. Then, by proceeding from step S5 to S6 in the flowchart of FIG. 5, as shown in FIG. 8, the measurement optical axis symbol Oo, the lens optical axis symbol Ol, and the P circle symbol Op as each object image IO are included in the lens image IL. , The measured value display Ov, the annular line symbol Ob, and the green coincidence symbol Om are displayed on the display screen 12a, and the process proceeds from step S7 to S2 to repeat the above operation.

  When the measurement optical axis symbol Oo matches the lens optical axis symbol Ol, the image generation unit 45 generates a pink match symbol Om in step S14 of the flowchart of FIG. Then, the process proceeds from step S5 to step S6 in the flowchart of FIG. 5, and as shown in FIG. 9, the measurement optical axis symbol Oo, the lens optical axis symbol Ol, and the P circle symbol Op as the object image IO are added to the lens image IL. A superimposed image IS in which the measured value display Ov, the annular line symbol Ob, and the pink matching symbol Om are superimposed and the line extending laterally to the lens optical axis symbol Ol extends to the end is displayed on the display screen 12a. Go to and repeat the above operation. By viewing the display screen 12a, the user can grasp that the measured optical axis symbol Oo and the lens optical axis symbol Ol coincide with each other while grasping the actual posture of the subject lens L. It can be seen that optical characteristic values can be obtained. Then, the user operates the operation unit 13 to acquire each optical characteristic value of the lens L to be measured, prints it from the printing unit 42 as appropriate, and ends the measurement.

  As described above, the lens meter 10 includes the object image IO displayed on the display screen 12a to assist the measurement of the lens L, that is, the measurement optical axis symbol Oo, the lens optical axis symbol Ol, and the P circle symbol Op. A superimposed image IS obtained by superimposing the lens image IL and the annular line symbol Ob indicating the outer edge of the lens L to be examined is displayed on the display screen 12a (display unit 12). Here, in the lens meter 10, it is difficult to grasp the region where the lens L is present simply by overlaying each object image IO excluding the annular line symbol Ob on the lens image IL and displaying it on the display screen 12 a. There is. This is particularly true when the test lens L is, for example, two-pointed or edgeless glasses in which the lower part of the lens is suspended by nylon thread or the like, as shown in FIG. 10, on the display screen 12a. It is likely to be difficult to grasp the area where there is. On the other hand, as shown in FIG. 7 and the like, the lens meter 10 causes the display unit 12 to display a superimposed image IS in which the annular line symbol Ob is superimposed on the lens image IL. Can be easily and easily grasped. For this reason, the lens meter 10 can grasp the region where the test lens L exists only by looking at the display screen 12a regardless of the type of the test lens L. For example, the lens meter 10 can be connected to the lens table 15 of the test lens L. It is possible to easily grasp the posture of the lens L to be tested from the way of contact. As a result, the lens meter 10 grasps the posture of the lens L to be measured, and the position of the lens L to be tested on the lens receiver 14 together with the lens table 15 so as to bring the measurement optical axis symbol Oo and the lens optical axis symbol Ol close to each other. The work of adjusting the can be made easy.

  The lens meter 10 of Example 1 of the lens meter according to the present disclosure can obtain the following functions and effects.

  The lens meter 10 causes the display unit 12 to display a lens region symbol Oa (annular line symbol Ob in the first embodiment) indicating the region where the lens L to be examined is superimposed on the lens image IL acquired by the imaging unit 30. Therefore, the lens meter 10 can grasp both the posture of the test lens L and the movement mode of the test lens L only by looking at the display unit 12. Thereby, the lens meter 10 can adjust the position of the test lens L while grasping the posture of the test lens L without looking at the actual test lens L even if it is an unfamiliar user. In the lens meter 10, if the lens L to be measured is separated from the lens table 15 or lifted from the lens receiver 14, there is a possibility that the optical characteristic value cannot be measured properly, but only by looking at the display unit 12. Since these can be confirmed and appropriately corrected, the optical characteristic value can be appropriately measured.

  In addition, the lens meter 10 includes a lens image IL that shows how the test lens L is moved, and a lens area symbol Oa (annular line symbol) in which the display position is changed according to the position of the test lens L in the lens image IL. Ob) can be displayed on the display unit 12 as a real-time moving image. For this reason, the lens meter 10 can easily adjust the position of the test lens L while grasping the posture of the test lens L only by looking at the display unit 12.

  Further, when the lens L to be examined has a plurality of focal points, the lens meter 10 uses at least one of a plurality of focal region symbols indicating regions corresponding to the respective focal points as the lens region symbol Oa (in the first embodiment). The distance portion region symbol Oaf (first annular line symbol Ob1) and the near portion region symbol Oan (second annular line symbol Ob2)) are displayed on the display unit 12. Therefore, the lens meter 10 can appropriately grasp the position and shape of the displayed one of the regions corresponding to the respective focal points only by looking at the display unit 12. Since the lens meter 10 according to the first embodiment displays all the focus-specific region symbols on the display unit 12, just looking at the display unit 12, the region where the distance portion in the bifocal lens exists and the near portion It is possible to appropriately grasp both of the areas where there is.

  The lens meter 10 causes the display unit 12 to display an annular line symbol Ob surrounding the lens L to be examined along the outer edge as the lens region symbol Oa. For this reason, the lens meter 10 can easily grasp the region where the test lens L exists while making use of the acquired lens image IL, and can easily grasp the posture of the test lens L without giving a sense of incongruity. Can do.

  In the light metering optical system 21 of the measurement optical system 20, the lens meter 10 includes an imaging unit 30 on a straight line that passes through the half mirror 21b from the lens 21c. Therefore, the lens meter 10 can easily acquire the lens image IL because the center position of the lens image IL and the measurement optical axis Lm coincide with each other, and the measurement optical axis symbols Oo and P are added to the lens image IL. It is possible to easily overlap the circle symbols Op. In addition, the lens meter 10 can easily provide the imaging unit 30.

  Therefore, in the lens meter 10 as an embodiment of the lens meter according to the present disclosure, the position of the test lens L can be adjusted while grasping the actual posture of the test lens L on the display unit 12.

  Although the lens meter of the present disclosure has been described based on the first embodiment, the specific configuration is not limited to the first embodiment and does not depart from the gist of the invention according to each claim of the claims. As long as the design is changed or added, it is allowed.

  For example, in the first embodiment, the imaging unit 30 is provided on a straight line that passes through the half mirror 21b from the lens 21c in the light projecting optical system 21 of the measurement optical system 20, but the test lens placed on the lens receiver 14 is used. As long as the image of L can be acquired, for example, as shown in FIG. Alternatively, it may be provided at another location, and is not limited to the configuration of the first embodiment. Further, as the imaging unit (30), a plurality of imaging units are provided, and an image of the lens L (lens image IL) placed on the lens receiver 14 by connecting images acquired by the imaging units together. It may be possible to obtain (form) and is not limited to the configuration of the first embodiment.

  In Example 1, the annular line symbol Ob shown in FIGS. 7 to 9 is displayed on the display unit 12 as the lens region symbol Oa. However, the lens area symbol Oa is not limited to the configuration of the first embodiment as long as it indicates an area where the test lens L exists in the lens image IL. As shown in FIG. 11, the lens region symbol Oa as another example is a filling symbol Of that fills the region where the lens L is present in the lens image IL in a form (color, pattern, etc.) different from the background. can do. In the filling symbol Of, the image generating unit 45 detects the outer edge of the lens L to be detected from the lens image IL and sets a plurality of curves over the entire circumference in the same manner as the annular line symbol Ob. The coordinates of each intersection set on the outer edge of the lens L to be examined are extracted from the lens image IL, and the inside of one annular line formed by connecting them with each set curve is different from the background. It can be generated by filling in. When the lens L to be examined has a plurality of focal points, the filling symbol Of is a plurality of focal region symbols indicating regions corresponding to the focal points as the lens region symbol Oa, and at least one of the focal region symbol is displayed. Displayed on the unit 12. For example, when the test lens L is a bifocal lens, the filling symbol Of fills the distance portion excluding the near portion as the distance portion region symbol Oaf of the lens region symbol Oa, as shown in FIG. It has a first filling symbol Of1 and a second filling symbol Of2 that fills the near portion as the near portion region symbol Oan of the lens region symbol Oa. These can be generated for the filling symbol Of as well as the first annular line symbol Ob1 and the second annular line symbol Ob2 for the annular line symbol Ob. With such a configuration, it is possible to grasp the region where the test lens L exists with a glance at the display unit 12, grasp the actual posture of the test lens L, and adjust the position of the test lens L. Can be made easier.

  Furthermore, in the first embodiment, the outer edge of the lens L to be detected is detected from the lens image IL first, and a plurality of curves and their intersections are set over the entire circumference of the outer edge. The annular line symbol Ob as the lens region symbol Oa is generated by extracting the coordinates of the respective intersections and connecting them with the respective curves. However, any other method may be used as long as it generates a lens area symbol Oa (annular line symbol Ob, filling symbol Of (including focal point-specific area symbols), etc.) indicating the region of the lens L to be examined from the lens image IL. The method is not limited to the method of the first embodiment.

  In the first embodiment, the imaging unit 30 captures a square area having a side of 100 mm with the measurement optical axis Lm as the center along a plane parallel to the horizontal plane on the lens receiver 14. However, if the imaging unit 30 can acquire an image (lens image IL) of the lens L to be tested placed on the lens receiver 14, the imaging position and region may be set as appropriate. It is not limited to the configuration.

  In the first embodiment, the measurement optical system 20 projects parallel light onto a small range in the test lens L in which the light projection optical system 21 is disposed on the lens receiver 14, so that the optical characteristic value of the test lens L is increased. Measurement is possible. However, the measurement optical system (20) is not limited to the configuration of Example 1 as long as it can measure the optical characteristic value of the lens L to be measured. As another example, it is possible to measure a wide range of optical characteristic values in the test lens L by projecting parallel light over a wide range in the test lens L using a Hartmann plate. Image).

  DESCRIPTION OF SYMBOLS 10 Lens meter 12 Display part 20 Measurement optical system 30 Image pick-up part 41 Control part IL Lens image L Test lens Ob Ring line symbol Of Filling symbol Of1 (As an example of a focal point different region symbol) 1st filling symbol Of2 Second filling symbol (as an example of symbol) Oa Lens region symbol Oaf Distance portion region symbol (as an example of focal region symbol) Oan Near region region symbol (as an example of focal region symbol)

Claims (5)

A measurement optical system for projecting measurement light onto the test lens and receiving the measurement light transmitted through the test lens;
A control unit that calculates an optical characteristic value of the test lens based on the received measurement light and controls the measurement optical system;
A display unit for displaying the calculated optical characteristic value under the control of the control unit;
An imaging unit that acquires a lens image of the lens under test being measured,
The control unit causes the display unit to display a lens region symbol indicating a region where the lens to be examined is present, superimposed on the lens image acquired by the imaging unit. The imaging unit acquires a moving image of a predetermined range centered on a mechanical center position as the lens image,
2. The lens meter according to claim 1, wherein the control unit displays the moving image of the lens image and the lens region symbol matched therewith on the display unit in real time.   When the lens to be examined has a plurality of focal points, the control unit displays, as the lens region symbol, at least one of a plurality of focal region symbols indicating regions corresponding to the respective focal points on the display unit. The lens meter according to claim 1 or 2, wherein   The said control part displays the cyclic | annular line symbol which surrounds the said to-be-tested lens along an outer edge as said lens area | region symbol on the said display part, The any one of Claims 1-3 characterized by the above-mentioned. Lens meter.   The control unit causes the display unit to display, as the lens region symbol, a filling symbol that fills a region in which the lens to be examined exists in a manner different from a background. 5. The lens meter according to claim 1.