JP6885763B2 - Lens meter - Google Patents

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 (irradiance power), cylinder axis angle (irradiance axis angle), and prism value (prism power and prism base direction) of the lens to be inspected. (See, for example, Patent Document 1).

This lens meter measures the cylinder axis angle, the prism base direction, and the like with reference to the posture of the lens to be inspected at the time of measurement. For this reason, the lens meter assists the lens to be in a predetermined posture by pressing the peripheral edge of the lens to be examined against the lens table during measurement.

Japanese Unexamined Patent Publication No. 11-132905

Here, the posture of the lens to be inspected changes depending on the mode in which the peripheral edge portion is pressed against the lens table. Further, in the above-mentioned lens meter, in order to appropriately measure the optical characteristic value, it is necessary to move the lens to be inspected while looking at the display unit to adjust the position. Therefore, in the case of an unfamiliar user, it may be necessary to move the test lens by looking at the display unit while checking the mode of pressing the actual test lens against the lens table.

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

In order to solve the above-mentioned problems, the lens meter of the present disclosure is based on a measurement optical system that projects measurement light onto a lens to be inspected and receives the measurement light transmitted through the lens to be inspected, and the received measurement light. A control unit that calculates the optical characteristic value of the lens to be inspected 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 subject being measured. The control unit includes an imaging unit that acquires a lens image of the lens to be inspected, and the control unit superimposes the lens image acquired by the imaging unit on the display unit to display a lens area symbol indicating a region in which the lens to be examined exists. 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 disclosure. 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 the 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) executed by the control part of a lens meter. It is a flowchart which shows the generation process (generation method) executed in the image generation part of the control part of a lens meter. It is explanatory drawing which shows the state which displayed the superposed image generated by superimposing each object image on the lens image in the display part of a lens meter. It is explanatory drawing which shows the state that the measurement optical axis symbol and the lens optical axis symbol are brought closer from the state shown in FIG. It is explanatory drawing which shows the state that the measurement optical axis symbol and the lens optical axis symbol are matched from the state shown in FIG. FIG. 5 is an explanatory diagram showing a state in which a superimposed image obtained by removing a ring road symbol (lens area symbol) from a lens image is displayed on a display unit in the state shown in FIG. It is explanatory drawing which shows the appearance of displaying the superimposition image which superposed the filling symbol as a lens area symbol.

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

The lens meter 10 of the first embodiment as an embodiment of the 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 of the first embodiment will be described.
"overall structure"

As shown in FIG. 1, the lens meter 10 has a device main body 11. The apparatus main body 11 is provided with a display unit 12 which is composed of a liquid crystal display, an organic EL display, or the like and is a touch panel type display screen 12a on the upper front surface. On the display screen 12a, an object image IO, which will be described later, showing the optical characteristic values (spherical power, cylindrical power, cylindrical axis angle, prism power, prism base direction, etc.) of the lens L (see FIG. 3), etc., was captured. The lens image IL of the lens L to be inspected (hereinafter, simply referred to as the lens image IL), the 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 operations such as starting and stopping the measurement, and a printing unit 42 (see FIG. 4) described later, the measurement result and the like are displayed. An operation unit 13 is displayed, which indicates 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 device main body 11, and is not limited to the configuration of the first embodiment.

In the apparatus main body 11, the optical member accommodating portions 11a and 11b for accommodating various optical members of the measurement optical system 20 (see FIG. 2) are vertically arranged below the display unit 12. The optical member accommodating portion 11a is provided so as to extend below the display unit 12, and accommodates the projection optical system 21 and the imaging unit 30 (see FIG. 2). The optical member accommodating portion 11b is provided below the optical member accommodating portion 11a at a distance from the optical member accommodating portion 11a, and houses the light receiving optical system 22 (see FIG. 2). At the upper end of the optical member accommodating portion 11b, a lens receiver 14 having a conical cylinder shape and on which the lens L to be inspected is mounted is integrally provided.

On the front surface of the apparatus main body 11, a lens table 15 is provided at a position behind the lens receiver 14. The position of the lens table 15 can be adjusted in the front-rear direction by rotating the operation lever 15a at a position where the lens L placed on the lens receiver 14 is pressed. As the lens L to be inspected, a circular unprocessed lens, a lens ground for spectacles, a lens framed in a spectacle frame, or the like is applied. The lens L to be inspected is pressed against the lens table 15 so that the lens optical axis Ll matches the measurement optical axis Lm of the measurement optical system 20 described later in order to improve the measurement accuracy of the optical characteristic value. 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 inspected, and is a position (a position where the prism value is 0) through which the incident light is passed without being refracted.

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

[Optical system configuration]
The lens meter 10 has a measurement optical system 20 for measuring the optical characteristic value of the lens L to be inspected. As shown in FIG. 2, the measurement optical system 20 includes a light projecting optical system 21 and a light receiving optical system 22.

The light projecting optical system 21 is an optical system that projects the measurement light onto the lens L to be inspected, and is housed in the optical member storage unit 11a (see FIG. 1). The projection 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 projection optical system 21 has a measurement optical axis Lm of the measurement optical system 20 extending from the light source 21a to the half mirror 21b and folded back by the half mirror 21b, and a lens 21c is provided on the measurement optical axis Lm. There is. The measurement optical axis Lm has a positional relationship that passes through the center of the opening 14a (see FIG. 1) provided at the upper end of the lens receiver 14. The projection optical system 21 converts the measurement light emitted from the light source 21a into parallel light having a predetermined diameter by passing through the half mirror 21b and the lens 21c to the lens L arranged on the lens receiver 14. Flood.

The light receiving optical system 22 is an optical system that receives the measurement light that has passed through the lens L to be inspected, and is housed below the lens receiver 14 in the optical member storage portion 11b (see FIG. 1). The light receiving optical system 22 has a filter 22a, a pattern plate 22b, and a measuring light receiving element 22c on a measurement optical axis Lm extending from the light projection optical system 21 through an 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 fluxes. As shown in FIG. 3, the pattern plate 22b is formed by providing a plurality of circular openings 22d arranged vertically and horizontally (two-dimensionally) at predetermined intervals, and in Example 1, seven openings 22d 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 luminous fluxes by passing through the filter 22a and the pattern plate 22b, and causes the measurement light receiving element 22c to receive light.

The measurement light receiving element 22c receives the plurality of divided measurement luminous fluxes, converts them into an electric signal (image signal), and outputs the light signal. This image signal includes information indicating the light receiving position and the shape of the light receiving image for each of the plurality of received divided measurement luminous fluxes. This information is expressed as the position coordinates on the pixel of the light receiving element 22c for measurement. Here, in each divided measurement luminous flux, the light receiving position on the light receiving element 22c for measurement is displaced according to the optical characteristic value of the lens L to be inspected, so that the pattern formed on the light receiving element 22c for measurement is reduced or reduced. Enlarged or distorted. The lens meter 10 of the first embodiment (control unit 41 (optical characteristic calculation unit 44) described later) obtains an optical characteristic value of the lens L to be inspected by analyzing the projection patterns of the plurality of divided measurement luminous fluxes.

In the first embodiment, in the projection optical system 21 of the measurement optical system 20, the image pickup unit 30 (imaging device) is provided on a straight line transmitted from the lens 21c through the half mirror 21b. The image pickup unit 30 is, for example, a monocular digital camera, and has an image pickup optical system 31 and an image pickup element 32. The image pickup optical system 31 is composed of a plurality of lenses, and cooperates with the lens 21c of the light projecting optical system 21 to form a subject image of the test lens L placed on the lens receiver 14 on the image pickup element 32. .. In the first embodiment, the imaging optical system 31 is capable of photographing a square region having a side of 100 mm while being centered on the measurement optical axis Lm along a plane parallel to the horizontal plane on the lens receiver 14. The image sensor 32 converts the subject image formed by the image pickup optical system 31 into an electric signal (image signal) and outputs the image.

[Control system configuration]
In the lens meter 10, as shown in FIG. 4, the control unit 41 that comprehensively controls each part of the lens meter 10 has the display unit 12, the operation unit 13, the light source 21a of the projection optical system 21, and the light receiving optical system. In addition to the measurement light receiving element 22c of 22 and the image pickup element 32 of the image pickup unit 30, the printing unit 42 and the storage unit 43 are connected. The control unit 41 expands the control program stored in the internal memory 41a or the storage unit 43 on, for example, a RAM (Random Access Memory), and performs various controls according to the operations performed on the operation unit 13. In the first embodiment, the internal memory 41a is composed of a RAM or the like, and the storage unit 43 is composed of 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 acquiring a lens image IL (still image or moving image) which is an image of the lens L to be inspected, and each divided measurement light source passing through the lens L to be inspected. There is control of the measurement optical system 20 (light source 21a and measurement light receiving element 22c) for acquiring the pattern formed by the lens. Further, as the control, the display control on the display unit 12 (display screen 12a), the print control for printing the optical characteristic value of the lens L to be inspected by the printing unit 42, and the storage of various data in the storage unit 43. There are controls such as processing and reading processing from the storage unit 43. In addition to the above-mentioned controls, the control unit 41 also functions as an optical characteristic calculation unit 44 and an image generation unit 45.

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, an image of a plurality of divided measurement light beams formed on the measurement light receiving element 22c, and the test lens L Calculate the optical characteristic values such as spherical power, columnar power, columnar axis angle, prism power, and prism base direction at the measurement point of. The optical characteristic calculation unit 44 includes the light receiving positions of a plurality of divided measurement luminous fluxes included in the image signal from the measurement light receiving element 22c (data indicating the coordinates of each divided measurement luminous flux on the light receiving surface of the measurement light receiving element 22c). The shape of the light-receiving image (data indicating the shape of the light-receiving point of each divided measurement luminous flux) is analyzed and acquired. Then, the optical characteristic calculation unit 44 sets the acquired light receiving position and the shape of the light receiving image as the light receiving position of each divided measurement luminous flux and the shape of the received light receiving image of each divided measurement luminous flux when the lens L to be inspected is not mounted. By comparing, the optical characteristic value of each measurement position of the lens L to be inspected is obtained. The light receiving position of each divided measurement luminous flux and the shape of the received image of each divided measurement luminous flux in the state where the test lens L is not mounted are measured in advance and stored in the internal memory 41a or the control program in the storage unit 43. Has been done.

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 to assist the measurement of the lens L to be inspected. A lens optical axis symbol Ol indicating the position of the lens optical axis Ll of the inspection lens L, a prism circle symbol Op (hereinafter referred to as P circle symbol Op) indicating the amount of prism stepwise, and (an image showing each symbol). (See Fig. 7 etc.). The measurement optical axis symbol Oo is the center position of the optical axis of the lens meter 10 (measurement optical system 20), that is, the position where the measurement optical axis Lm exists (by the pattern plate 22b) assuming that there is no test lens L in the measurement optical system 20. The position of the center of gravity of the formed pattern) is shown, and is shown as the center of the P circle symbol Op in the first embodiment.

The lens optical axis symbol Ol indicates the position of the lens optical axis Ll of the lens L to be inspected, 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 inspected 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 lens L to be inspected stepwise 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 so as to connect equal prism values around the position of the measurement optical axis Lm in a circle and to be located outside as the prism value increases. ..

In the first embodiment, the image generation unit 45 emphasizes 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 come close to each other, as will be described later. The matching symbol Om (an image showing the symbol) surrounded by the divided thick frame is displayed in green (see FIG. 8). Further, in the first embodiment, the image generation unit 45 displays the matching symbol Om in pink when the measurement optical axis symbol Oo and the lens optical axis symbol Ol match, and P draws a line extending horizontally in the lens optical axis symbol Ol. It is assumed that the circle symbol Op is extended to the end (see FIG. 9). As long as the matching symbol Om assists the operation of matching the measurement optical axis symbol Oo and the lens optical axis symbol Ol, the color and display mode may be appropriately set, and the example of the first embodiment may be used. Not limited. Further, the match symbol Om may be enlarged and displayed on the display screen 12a together with the lens optical axis symbol Ol. With such an enlarged configuration, the operation of matching the measurement optical axis symbol Oo and the lens optical axis symbol Ol can be made easier as described later.

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

Further, the image generation unit 45 obtains the lens image IL of the lens L to be imaged by the image pickup unit 30 from the image pickup signal input from the image pickup element 32 of the image pickup unit 30, that is, the subject image photoelectrically converted by the image pickup device 32. Generate. The image generation unit 45 performs necessary processing and processing (for example, coordinate conversion, contrast adjustment, color conversion (translucency, sepia color, etc.), brightness adjustment, filter, etc.) on the image captured by the image pickup unit 30. Processing, etc.) is performed to generate the desired lens image IL. In the first embodiment, the image generation unit 45 suppresses the brightness of the lens image IL or displays it lightly (for example, translucent or sepia color) so that the lens image IL is less noticeable than the object image IO. To generate.

Here, when the lens image IL is generated, since the lens pressing member 16 presses the lens L to be examined from above, it is conceivable that the lens pressing member 16 is reflected on the lens L to be examined. Therefore, in the lens meter 10 of the first embodiment, the lens pressing member 16 is formed of a sheet metal or the like and has a structure in which a thin plate-shaped member viewed from above is combined to minimize the reflection of the lens pressing member 16. It is kept in. In particular, in the imaging unit 30 of the first embodiment, since the lens receiver 14 is in focus, the lens pressing member 16 that presses the lens L to be inspected from above is not in focus, and a thin plate-shaped member is formed. By doing so, it is possible to substantially eliminate the reflection of the lens pressing member 16. As a configuration for eliminating the reflection, since the area where the lens pressing member 16 is reflected is known in advance, the image generation unit 45 may erase it by image processing, or the lens pressing member 16 may be formed of a transparent member. Often, other configurations may be used, and the configuration is not limited to that 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 the sake of easy understanding.

The image generation unit 45 detects from the acquired lens image IL the region in which the lens L to be examined exists, that is, the shape of the lens L to be examined and the coordinate position on the image, and is to be inspected. The lens area symbol Oa indicating the area where the lens L exists is generated. In the first embodiment, the lens area symbol Oa is an annular line symbol Ob (see FIG. 7 and the like) that surrounds the lens L to be inspected along the outer edge. The image generation unit 45 detects the outer edge of the lens L to be inspected 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, etc.). 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 the intersections of the curves, and sets the positional relationship between the curves and the intersections in the internal memory 41a or the storage unit. Store in 43. Then, the image generation unit 45 extracts the coordinates of each intersection set on the outer edge of the lens L to be inspected from the lens image IL and connects them with each set curve to form one annular line. Generate the line symbol Ob.

When the lens L to be inspected has a plurality of focal points, the image generation unit 45 displays at least one of a plurality of focal area symbols indicating regions corresponding to the respective focal points as the lens area symbol Oa. It is generated to be displayed on the display screen 12a). For example, when the lens L to be inspected is a bifocal lens, the image generation unit 45 uses the distance area symbol Oaf indicating the distance portion and the near portion region symbol Oa indicating the near portion as the lens area symbol Oa. Generates two focal area symbols, Oan and. The bifocal lens refers to a lens (see FIG. 10 and the like) in which a near portion (so-called small ball) having a different focus is provided inside the lens serving as a distance portion. In the first embodiment, the image generation unit 45 generates the first annular line symbol Ob1 that surrounds the outer edge of the distance portion as the distance portion area symbol Oaf, and surrounds the outer edge of the near portion as the near portion region symbol Oan. 2 Generate the circular line symbol Ob2 (see FIG. 7 and the like). Since the outer edge of the lens L to be inspected is the outer edge of the distance portion, the first ring road symbol Ob1 can be generated in the same manner as the ring road symbol Ob1. Further, the second ring road symbol Ob2 is generated in the same manner as the ring road symbol Ob2 by detecting the outer edge of the near portion provided inside the lens L to be inspected from the lens image IL by a well-known technique. Can be done.

In addition, when the subject lens L is a trifocal lens provided with a distance portion, a near portion, and an intermediate portion between them, the image generation unit 45 uses the lens region symbol Oa (focus-specific region symbol) as the lens region symbol Oa. The distance area symbol Oaf (first ring line symbol Ob1) and the near area symbol Oan (second ring line symbol Ob2) are generated, and the intermediate area symbol (third ring line symbol) is generated. The intermediate region symbol (third ring road symbol) is the distance region symbol described above by detecting the outer edge of the intermediate portion provided inside the lens L to be inspected from the lens image IL by a well-known technique. It can be generated in the same way as the near-field area symbol.

The area symbols for each focal point (distance area symbol Oaf (first ring line symbol Ob1), near area symbol Oan (second ring line symbol Ob2), and intermediate area symbol (third ring line symbol)) are , All may be generated and displayed on the display unit 12 for a single test lens L having a plurality of focal points (see FIG. 7 and the like), and an arbitrary number may be generated and displayed on the display unit 12. You may let me. The arbitrary number means that, for example, in the case of a bifocal lens, only one of the distance area symbol Oaf and the near area symbol Oan is generated and displayed, and in the case of a trifocal lens, the distance is used. It means to generate and display one or two of the part area symbol Oaf, the near part area symbol Oan, and the intermediate part area symbol. Then, the lens meter 10 can improve usability by enabling designation (including setting of the number) of what is to be displayed on the display unit 12 among the area symbols for each focal point.

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 Ov, and the annular line symbol Ob on the lens image IL to generate 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. Therefore, the image generation unit 45 superimposes the measurement optical axis symbol Oo on the center position in the lens image IL, and superimposes the P circle symbol Op on the center position. 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 inspected becomes 0 according to the light receiving position of the measured light in the measuring light receiving element 22c of the light receiving optical system 22. The measured value display Ov is superimposed on the right side of. In the first embodiment, the image generation unit 45 is in the direction in which the prism value of the lens L to be examined 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. As a result, the image generation unit 45 generates a superposed image IS in which each object image IO is superimposed on the lens image IL.

The control unit 41 outputs the superimposed image IS (the data thereof) generated by the image generation unit 45 to the display unit 12 and displays it on the display screen 12a (see FIG. 7 and the like). On the display screen 12a, the lens image IL showing how the test lens L is moved by repeating the above-mentioned operations by the image generation unit 45 and the control unit 41, and the lens according to the position of the test lens L. The lens optical axis symbol Ol, which indicates how the optical axis Ll moves, is projected as a real-time moving image (see FIG. 7 and the like).

[Image control processing configuration]
Next, a display process (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 the program stored in the internal memory 41a or the storage unit 43. Hereinafter, each step (each step) of the flowchart of FIG. 5 will be described. The flowchart of FIG. 5 is started when the measurement of the lens L to be inspected is started by the lens meter 10.

In step S1, the imaging unit 30 starts acquiring the lens image IL, which is an image of the lens L to be inspected, and proceeds to step S2.

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

In step S3, each optical characteristic value of the lens L to be inspected is calculated, and the process proceeds to step S4. In step S3, the optical characteristic calculation unit 44 determines the spherical power, the prism power, and the prism shaft at the measurement point of the lens L based on the measurement data of the lens L to be measured, that is, the image signal input from the light receiving element 22c for measurement. Calculate optical characteristic values such as angle, prism power, and prism base direction.

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 ring 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 proximity 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 is displayed with the measurement optical axis symbol Oo, the lens optical axis symbol Ol, the P circle symbol Op, and the measurement value display Ov as each object image IO. And the ring-shaped line symbol Ob and (in some cases, the matching symbol Om) are superimposed to generate a superposed image IS.

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

In step S7, it is determined whether or not the measurement of the lens L to be inspected has been completed. If YES, the process proceeds to step S8, and if NO, the process returns to step S2. In step S7, the determination as to whether or not this measurement has been completed ends when, for example, an operation signal to end the measurement is received from the operation unit 13 or the lens L to be inspected is removed from the lens receiver 14. In other cases, it is judged that it is not finished. It should be noted that the determination as to whether or not this measurement has been completed is a signal of an operation in which each optical characteristic value of the lens L to be inspected acquired from the operation unit 13 is printed by the printing unit 42 or the data is transmitted to the outside. Upon receiving the above, it may be determined that the process is terminated, and the configuration is not limited to that of the first embodiment.

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

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

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, and if NO, the process proceeds to step S13. In step S11, a plurality of curves that are approximated over the entire circumference of the outer edge of the lens L to be examined are assigned and set with respect to the lens image IL that has been acquired in step S1 of the flowchart of FIG. Judge whether or not is set. This determination can be made, for example, by confirming whether or not the internal memory 41a or the storage unit 43 stores the positional relationship of each curve and each intersection corresponding to the 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 are approximated over the entire circumference of the outer edge of the lens L to be examined are assigned and set with respect to the lens image IL that was started to be acquired in step S1 of the flowchart of FIG. Is set, and their positional relationship is stored in the internal memory 41a or the storage unit 43.

In step S13, the ring road 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 inspected are extracted from the lens image IL at this time, and they are connected by the set curves to form one annular line. An annular line symbol Ob corresponding to the position of the lens L to be inspected in the lens image IL at the time point is generated.

In step S14, each object image IO other than the ring road symbol Ob is generated, and this generation process is completed. In step S14, the measurement optical axis symbol Oo, the lens optical axis symbol Ol, the P circle symbol Op, and the measured value display Ov are generated, and this generation process is completed. Further, in step S14, the matching symbol Om is appropriately generated according to the distance (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)), green match symbols Om are generated, and they match (exactly). It is not limited to matching in a certain sense, but also includes approaching a predetermined distance (second distance) that is extremely small), and a pink matching symbol Om is generated.

Next, an example of the operation when measuring the optical characteristic value of the lens L to be inspected by the lens meter 10 will be described. The user (examiner) operates the lens meter 10 to start the measurement of the lens L to be inspected by the operation unit 13, and puts the lens L to be inspected on the lens receiver 14 while mounting the lens L to be inspected. The peripheral edge is pressed against the lens table 15. In the first embodiment, as the test lens L, as shown in FIG. 7 and the like, a pair of lenses configured as rimless glasses (two points) using a bifocal lens is applied.

Then, the lens meter 10 executes the display process shown in the flowchart of FIG. 5, proceeds to steps S1 → S2 → S3 to calculate each optical characteristic value of the lens L to be inspected, and proceeds to step S4 for each. Generate object image IO. Then, since the image generation unit 45 has not set each curve and each intersection with respect to the lens image IL that captures the measurement of the lens L to be inspected, in the generation process shown in the flowchart of FIG. In steps S11 to S12, a plurality of curves are set over the entire circumference of the outer edge of the lens L to be inspected, and intersections of the curves are set. Then, the image generation unit 45 proceeds to step S13 in the flowchart of FIG. 6 to generate the ring road symbol Ob corresponding to the lens image IL at this time. Here, in this example, since the test lens L is a bifocal lens, the ring road symbol Ob is the first ring road symbol Ob1 that surrounds the outer edge of the distance portion and the ring road symbol Ob1 that surrounds the outer edge of the near portion. The second ring road 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 image generation unit 45 starts the measurement of the lens L to be inspected, the process proceeds to step S14 in the flowchart of FIG. The measurement optical axis symbol Oo, the lens optical axis symbol Ol, the P circle symbol Op, and the measured value display Ov are generated without generating. 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 displayed in the lens image IL. The superimposed image IS in which the measured value display Ov and the annular line symbol Ob are superimposed is displayed on the display screen 12a, and the process proceeds from step S7 to S2 to repeat the above operation.

The user moves the 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 come close to each other while looking at the display screen 12a. At this time, on the display screen 12a, the state in which the lens L to be inspected and its peripheral edge are pressed against the lens table 15 is projected on the lens image IL, and the ring road 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 test lens L and the contact method of the test lens L with the lens table 15 only by looking at the display screen 12a, and the actual test lens. It is possible to easily adjust the position of the lens L to be inspected by bringing the measurement optical axis symbol Oo and the lens optical axis symbol Ol close to each other while grasping the posture of L.

After that, since the image generation unit 45 has set each curve and each intersection in the lens image IL, in the generation process shown in the flowchart of FIG. 6, the process proceeds to steps S11 → S13 → S14, and the lens image at that time. The ring line symbol Ob (first ring line symbol Ob1 and second ring line symbol Ob2) corresponding to the IL is generated. Therefore, since it is not necessary for the image generation unit 45 to set each curve and each intersection in the lens image IL from the second time onward, it is possible to easily generate the ring road symbol Ob.

Then, when the measurement optical axis symbol Oo and the lens optical axis symbol Ol come close to each other, the image generation unit 45 generates the 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 displayed in the lens image IL. The superimposed image IS in which the measured value display Ov, the circular line symbol Ob, and the green match symbol Om are superimposed is displayed on the display screen 12a, and the process proceeds from step S7 to S2 to repeat the above operation.

Further, when the measurement optical axis symbol Oo and the lens optical axis symbol Ol match, the image generation unit 45 generates the pink match symbol Om in step S14 of the flowchart of FIG. Then, in the flowchart of FIG. 5, the process proceeds from step S5 to S6, 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 each object image IO are displayed on the lens image IL. The superimposed image IS in which the measured value display Ov, the annular line symbol Ob, and the pink match symbol Om are superimposed and the line extending to the side of the lens optical axis symbol Ol extends to the end is displayed on the display screen 12a, and steps S7 → S2 And repeat the above operation. By looking at the display screen 12a, the user can grasp that the measurement optical axis symbol Oo and the lens optical axis symbol Ol match while grasping the actual posture of the lens L to be inspected, and the accuracy of the lens L to be inspected is accurate. It can be seen that the optical characteristic value can be obtained. Then, the user operates the operation unit 13 to acquire each optical characteristic value of the lens L to be inspected, prints it from the printing unit 42 as appropriate, and ends the measurement.

In this way, the lens meter 10 displays each object image IO displayed on the display screen 12a to assist the measurement of the lens L to be inspected, that is, the measurement optical axis symbol Oo, the lens optical axis symbol Ol, and the P circle symbol Op. The superimposed image IS in which the lens image IL and the annular line symbol Ob indicating the outer edge of the lens L to be inspected are superimposed is displayed on the display screen 12a (display unit 12). Here, in the lens meter 10, it may be difficult to grasp the region where the lens L to be inspected exists only by superimposing each object image IO excluding the ring road symbol Ob on the lens image IL and displaying it on the display screen 12a. There is. This means that, in particular, when the lens L to be inspected is, for example, two-point or rimless glasses in which the lower part of the lens is suspended by nylon thread or the like, the lens L to be inspected is displayed on the display screen 12a as shown in FIG. It tends to be difficult to grasp the area where the lens exists. On the other hand, as shown in FIG. 7 and the like, the lens meter 10 causes the display unit 12 to display the superimposed image IS in which the ring road symbol Ob is superimposed on the lens image IL, so that the region where the lens L to be examined exists is appropriate. It can be easily grasped. Therefore, regardless of the type of the lens L to be examined, the lens meter 10 can grasp the region where the lens L to be examined exists only by looking at the display screen 12a. For example, the lens table 15 of the lens L to be examined can be displayed. The posture of the lens L to be inspected can be easily grasped from the way of contacting the lens L. As a result, the lens meter 10 grasps the posture of the lens L to be inspected, and the position of the lens L to be inspected 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 brought close to each other. The work of adjusting the lens can be facilitated.

The lens meter 10 of the first embodiment of the lens meter according to the present disclosure can obtain the following effects.

The lens meter 10 superimposes the lens image IL acquired by the imaging unit 30 on the display unit 12 to display the lens area symbol Oa (annular line symbol Ob in the first embodiment) indicating the region where the lens L to be examined exists. Therefore, the lens meter 10 can grasp both the posture of the lens L to be inspected and the mode of movement of the lens L to be inspected just by looking at the display unit 12. As a result, 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 by an inexperienced user. Further, in the lens meter 10, if the lens L to be inspected is separated from the lens table 15 or lifted from the lens receiver 14, the optical characteristic value may not be measured appropriately, 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.

Further, the lens meter 10 has a lens image IL showing how the lens L to be examined is moved, and a lens area symbol Oa (annular line symbol Oa) whose display position is changed according to the position of the lens L to be examined in the lens image IL. Ob) and can be projected on the display unit 12 as a real-time moving image. Therefore, 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 inspected has a plurality of focal points, the lens meter 10 uses at least one of a plurality of focal area symbols indicating regions corresponding to the respective focal points as the lens region symbol Oa (in the first embodiment). The far-distance area symbol Oaf (first ring-shaped line symbol Ob1) and the near-distance area symbol Oan (second ring-shaped 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 area in the area corresponding to each focal point only by looking at the display unit 12. Since the lens meter 10 of the first embodiment displays all the focal area symbols on the display unit 12, the region where the distance portion exists and the near portion in the bifocal lens can be seen only by looking at the display unit 12. It is possible to properly grasp both the area where the is present.

The lens meter 10 causes the display unit 12 to display the annular line symbol Ob that surrounds the lens L to be inspected along the outer edge as the lens area symbol Oa. Therefore, the lens meter 10 can easily grasp the region where the lens L to be examined exists while utilizing the acquired lens image IL, and can easily grasp the posture of the lens L to be examined without giving a sense of discomfort. Can be done.

The lens meter 10 is provided with an image pickup unit 30 on a straight line transmitted from the lens 21c to the half mirror 21b in the projection optical system 21 of the measurement optical system 20. Therefore, in the lens meter 10, since the center position of the lens image IL and the measurement optical axis Lm match, it is possible to easily acquire the lens image IL, and the measurement optical axis symbols Oo and P are added to the lens image IL. It is possible to easily superimpose the circle symbol Op. Further, the lens meter 10 can be easily provided with the image pickup unit 30.

Therefore, in the lens meter 10 as an embodiment of the lens meter according to the present disclosure, the position of the lens L to be examined can be adjusted while grasping the actual posture of the lens L to be examined 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 deviate from the gist of the invention according to each claim in the claims. As long as the design is changed or added, it is permissible.

For example, in the first embodiment, the image pickup unit 30 is provided on a straight line transmitted through the half mirror 21b from the lens 21c in the projection optical system 21 of the measurement optical system 20, but the test lens placed on the lens receiver 14. As long as the image of L can be acquired, for example, as shown in FIG. 1, it may be provided at the installation location 30A inside or behind the lens table 15, or at the installation location 30B inside the lens pressing member 16. It may be provided in other places, and is not limited to the configuration of the first embodiment. Further, as the image pickup unit (30), a plurality of image pickup units are provided, and the images acquired by each image pickup unit are joined to form an image of the lens L to be inspected (lens image IL) placed on the lens receiver 14. It may be capable of acquisition (formation) and is not limited to the configuration of the first embodiment.

Further, in the first embodiment, the ring road symbol Ob shown in FIGS. 7 to 9 is displayed on the display unit 12 as the lens region symbol Oa. However, the lens region symbol Oa is not limited to the configuration of the first embodiment as long as it indicates a region in which the lens L to be examined 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 to be examined exists in a mode (color, pattern, etc.) different from the background in the lens image IL. can do. In the filling symbol Of, the image generation unit 45 detects the outer edge of the lens L to be inspected from the lens image IL and sets a plurality of curves over the entire circumference, and the intersection of the curves is set in the same manner as the annular line symbol Ob. Is set, the coordinates of each intersection set on the outer edge of the test lens L 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 with. When the lens L to be inspected has a plurality of focal points, the filling symbol Of is a plurality of focal area symbols indicating regions corresponding to each focal point as the lens area symbol Oa, and at least one of the focal area symbols is displayed. It is displayed in part 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 also be generated for the filling symbol Of, similar to the first ring road symbol Ob1 and the second ring road symbol Ob2 for the ring road symbol Ob. With such a configuration, it is possible to grasp the area where the test lens L exists just by looking at the display unit 12, and to grasp the actual posture of the test lens L and adjust the position of the test lens L. Can be made easier.

Further, in the first embodiment, the outer edge of the lens L to be inspected is first detected from the lens image IL, a plurality of curves and their intersections are set over the entire circumference of the outer edge, and the lens image IL at the time of generation is used. By extracting the coordinates of each intersection and connecting them with each curve, the circular line symbol Ob as the lens region symbol Oa is generated. However, if the lens area symbol Oa (annular line symbol Ob, filling symbol Of (including focal area symbol), etc.) indicating the region of the lens L to be inspected is generated from the lens image IL, another method is used. However, the method is not limited to the method of Example 1 described above.

In the first embodiment, the imaging unit 30 photographs a square region having a side of 100 mm while centering on the measurement optical axis Lm along a plane parallel to the horizontal plane on the lens receiver 14. However, as long as the image pickup unit 30 can acquire an image (lens image IL) of the lens L to be inspected placed on the lens receiver 14, the shooting position and region may be appropriately set, and the image pickup unit 30 may appropriately set the shooting position and region. It is not limited to the configuration.

In the first embodiment, the measurement optical system 20 projects parallel light over a small range of the test lens L in which the light projecting optical system 21 is arranged on the lens receiver 14, thereby determining the optical characteristic value of the test lens L. It enables measurement. However, the measurement optical system (20) is not limited to the configuration of the first embodiment as long as it can measure the optical characteristic value of the lens L to be inspected. As another example, the distribution of optical characteristic values (mapping) enables measurement of 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. The ones that form the image) can be mentioned.

10 Lens meter 12 Display unit 20 Measurement optical system 30 Imaging unit 41 Control unit IL Lens image L Lens to be inspected Ob Circular line symbol Of Filling symbol Of1 (As an example of focal area symbol) First filling symbol Of2 (Focal area) Second filling symbol (as an example of the symbol) Oa Lens area symbol Oaf (as an example of the focal area symbol) Distance area symbol Oan (as an example of the focal area symbol) Near area symbol

Claims (5)

A measurement optical system that projects measurement light onto the lens under test and receives the measurement light that has passed through the lens under test.
A control unit that calculates the optical characteristic value of the lens to be inspected based on the received measurement light and controls the measurement optical system.
A display unit that displays the calculated optical characteristic values under the control of the control unit, and
An imaging unit that acquires a lens image of the lens under test during measurement is provided.
The control unit detects the outer edge of the lens to be inspected from the lens image acquired by the imaging unit, generates a lens area symbol, and superimposes the lens area symbol on the lens image to display the lens area symbol on the display unit. A lens meter featuring. The imaging unit acquires a moving image in a predetermined range centered on the mechanical center position as the lens image, and obtains a moving image in a predetermined range.
The lens meter according to claim 1, wherein the control unit displays a moving image of the lens image and the lens area symbol matching the moving image on the display unit in real time. When the lens under test has a plurality of focal points, the control unit displays at least one of a plurality of focal area symbols indicating regions corresponding to the respective focal points on the display unit as the lens area symbols. The lens meter according to claim 1 or 2, wherein the lens meter is made to work. The invention according to any one of claims 1 to 3, wherein the control unit displays a ring road symbol surrounding the lens to be inspected along the outer edge as the lens area symbol on the display unit. Lens meter. Any of claims 1 to 3, wherein the control unit displays, as the lens area symbol, a filling symbol that fills the area where the lens under test exists in a mode different from the background. The lens meter according to item 1.

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