JP6885762B2 - 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).

In this lens meter, the position of the test lens is adjusted so that the optical axis position of the measurement optical system (position of the measurement optical axis) and the optical axis position of the test lens (position of the lens optical axis) match. , It is possible to improve the measurement accuracy of the optical characteristic value of the lens to be inspected. In this lens meter, the position of the test lens is displayed by displaying the measurement optical axis symbol indicating the optical axis position of the measurement optical system and the lens optical axis symbol indicating the optical axis position of the test lens on the display unit. Assists in the adjustment of.

Japanese Unexamined Patent Publication No. 11-132905

By the way, the mode of movement (movement amount and movement direction) of the measurement optical axis with respect to the movement of the test lens changes according to the optical characteristic value of the test lens. For this reason, with the above-mentioned lens meter, if the user is unfamiliar, he / she feels uncomfortable when moving the lens under test while looking at the display unit, and the lens under test is compared with the actual lens under test and the display unit. It may be necessary to move it. Further, in the above-mentioned lens meter, it is necessary to look at the actual lens to be inspected in order to confirm whether the lens to be inspected has an appropriate posture (tilt).

The present disclosure has been made in view of the above circumstances, and the optical axis position of the measurement optical system and the optical axis position of the test lens are matched while grasping the actual movement of the test lens on the display unit. It is an object of the present invention to provide a lens meter capable of providing an optical axis.

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 detection lens, and the control unit superimposes the lens image acquired by the imaging unit on the measurement optical axis symbol indicating the optical axis position of the measurement optical system, and the measurement optical axis symbol. A lens position symbol indicating the position of the lens to be inspected and a lens position symbol are displayed on the display unit.

According to the lens meter of the present disclosure, it is possible to match the optical axis position of the measurement optical system with the optical axis position of the test lens while grasping the actual movement 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.

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 9. 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 part of the 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 9, the lens receiver 14 and the lens pressing member 16 are omitted for the sake of easy understanding.

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, and the measurement value display Ov on the lens image IL to generate the superimposed image IS. 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, and the measured value display Ov as the object image IO. Here, as shown in the flowchart of FIG. 6 described later, the image generation unit 45 also appropriately generates the matching 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 (in some cases, the match 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.

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, each object image IO other than the match symbol Om is generated, and the process proceeds to step S12. In step S11, 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.

In step S12, it is determined whether or not the measurement optical axis symbol Oo and the lens optical axis symbol Ol are far from each other. If YES, the process proceeds to step S13, and if NO, the process proceeds to step S14. In step S12, the position of the measurement optical axis Lm indicated by the measurement optical axis symbol Oo and the position of the lens optical axis Ll indicated by the lens optical axis symbol Ol are determined based on the measurement data of the lens L to be inspected from the measurement optical system 20. It is determined whether or not the distance is greater than a predetermined distance (first distance). This first distance is predetermined and stored in the internal memory 41a or the storage unit 43.

In step S13, since the measurement optical axis symbol Oo and the lens optical axis symbol Ol are far apart, this generation process ends without generating the matching symbol Om. Therefore, in step S5 of the flowchart of FIG. 5 after this, 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 are superimposed on the lens image IL. The combined superimposed image IS is generated.

In step S14, it is determined whether or not the measurement optical axis symbol Oo and the lens optical axis symbol Ol match, and if YES, the process proceeds to step S16, and if NO, the process proceeds to step S15. In step S14, the position of the measurement optical axis Lm indicated by the measurement optical axis symbol Oo and the position of the lens optical axis Ll indicated by the lens optical axis symbol Ol are determined based on the measurement data of the lens L to be inspected from the measurement optical system 20. It is determined whether or not there is a match (not limited to a match in a strict sense, and it may be determined whether or not the distance is closer than a predetermined distance (second distance) which is extremely small).

In step S15, since the measurement optical axis symbol Oo and the lens optical axis symbol Ol are closer than the first distance but do not match, a green match symbol Om is generated and this generation process is completed. Therefore, in step S5 of the flowchart of FIG. 5 after this, the measurement optical axis symbol Oo, the lens optical axis symbol Ol, the P circle symbol Op, the measurement value display Ov, and the green color are displayed on the lens image IL as each object image IO. A superposed image IS in which the matching symbol Om is superimposed is generated.

In step S16, since the measurement optical axis symbol Oo and the lens optical axis symbol Ol match, a pink match symbol Om is generated, and this generation process ends. Therefore, in step S5 of the flowchart of FIG. 5 after this, the measurement optical axis symbol Oo, the lens optical axis symbol Ol, the P circle symbol Op, the measurement value display Ov, and the pink color are displayed on the lens image IL as each object image IO. A superposed image IS is generated in which the matching symbol Om is superimposed and the line extending laterally of the lens optical axis symbol Ol extends to the end.

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 eyeglasses 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 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, in the generation process shown in the flowchart of FIG. 6, steps S11 → S12 → Proceeding to S13, 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 the match symbol Om. Then, by proceeding from step S5 to S6 in the flowchart of FIG. 5, as shown in FIG. 7, the measured optical axis symbol Oo, the lens optical axis symbol Ol, and the P circle as each object image IO are displayed on the generated lens image IL. The superimposed image IS in which the symbol Op and the measured value display Ov are superimposed is displayed on the display screen 12a, and the process proceeds from step S7 to S2 to repeat the above operation.

When the measurement of the lens L to be inspected is started, the measurement optical axis symbol Oo and the lens optical axis symbol Ol are separated from each other. Therefore, the user can look at the display screen 12a and look at the measurement optical axis symbol Oo and the lens optical axis symbol Oo. The lens L to be inspected on the lens receiver 14 is moved together with the lens table 15 so that the lens is close to the Ol. At this time, since the lens image IL is also projected on the display screen 12a, the user can easily and appropriately see how the lens L to be examined is actually moving just by looking at the display screen 12a. It is possible to easily grasp the measurement optical axis symbol Oo and the lens optical axis symbol Ol.

When the measurement optical axis symbol Oo and the lens optical axis symbol Ol come close to each other, the image generation unit 45 proceeds to steps S11 → S12 → S14 → S15 in the flowchart of FIG. 6, and the measurement optical axis symbol Oo and the lens optical axis symbol Oo and the lens optical axis symbol A green match symbol Om is generated together with the Ol, the P circle symbol Op, and the measured value display Ov. Then, by proceeding from step S5 to S6 in the flowchart of FIG. 5, as shown in FIG. 8, the measured optical axis symbol Oo, the lens optical axis symbol Ol, and the P circle as each object image IO are displayed on the generated lens image IL. The superimposed image IS in which the symbol Op, the measured value display Ov, 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. 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 have come very close to each other, so that the measurement optical axis symbol Oo and the lens optical axis symbol Ol match. Subsequently, the test lens L is moved.

Then, when the measurement optical axis symbol Oo and the lens optical axis symbol Ol match, the image generation unit 45 proceeds to steps S11 → S12 → S14 → S16 in the flowchart of FIG. 6, and the measurement optical axis symbol Oo and the lens light A pink match symbol Om is generated together with the axis symbol Ol, the P circle symbol Op, and the measured value display Ov. Then, in the flowchart of FIG. 5, the process proceeds from step S5 to S6, and as shown in FIG. 9, the generated lens image IL has the measurement optical axis symbol Oo, the lens optical axis symbol Ol, and the P circle symbol as each object image IO. Op, the measured value display Ov, and the pink match symbol Om are superimposed, and the superimposed image IS in which 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 the process proceeds from step S7 to S2. Repeat the above operation with. 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, and it is understood that an accurate optical characteristic value of the lens L to be inspected 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 on which the lens image IL is superimposed is displayed on the display screen 12a (display unit 12). Here, in the lens meter 10, in the spectacle lens (MIX lens) in which the cylindrical lens having a negative spherical power and the cylindrical lens having a positive spherical power intersect at 90 degrees, the positive power and the negative power are combined. Therefore, depending on the direction, even if the lens L to be inspected is moved so that the measurement optical axis symbol Oo and the lens optical axis symbol Ol come close to each other, they cannot be matched on the P circle symbol Op. Further, in the lens meter 10, two lenses L having different spherical powers have different amounts of movement of the lens optical axis symbol Ol on the P circle symbol Op even if each lens L is moved by the same amount. On the other hand, the lens meter 10 can simultaneously show both the mode of movement of the lens L to be examined and the mode of movement of the lens optical axis symbol Ol accompanying the movement of the lens L to be examined on the display screen 12a. It is possible to easily grasp the moving direction and the amount of movement of the lens optical axis symbol Ol with respect to the lens. As a result, the lens meter 10 can easily move 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.

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 measurement optical axis symbol Oo indicating the position of the measurement optical axis Lm of the measurement optical system 20 and the position of the lens optical axis Ll of the lens L to be inspected. The indicated lens position symbol (lens optical axis symbol Ol in the first embodiment) is displayed on the display unit 12. Therefore, the lens meter 10 can grasp the mode of movement of the lens L with respect to the measurement optical axis symbol Oo only by looking at the display unit 12. As a result, the lens meter 10 allows even an inexperienced user to obtain the position of the measurement optical axis Lm of the measurement optical system 20 and the position of the lens optical axis Ll of the test lens L without looking at the actual lens L to be inspected. Can be matched. Further, since the lens meter 10 displays the lens image IL on the display unit 12, it is possible to confirm whether the lens L to be inspected has an appropriate posture (tilt) without looking at the actual lens L to be inspected. .. In particular, the lens meter 10 displays the lens optical axis symbol Ol at a position where the prism value of the lens L to be inspected becomes 0 as the lens position symbol, so that even an inexperienced user can actually use the lens L to be inspected. The position of the measurement optical axis Lm and the position of the lens optical axis Ll can be more appropriately matched without looking.

Further, the lens meter 10 has a lens image IL showing how the lens L to be examined is moved and a lens optical axis showing how the lens optical axis Ll (the position) moves according to the position of the lens L to be examined. The symbol Ol and the symbol Ol can be projected on the display unit 12 as a real-time moving image. Therefore, the lens meter 10 is more appropriate for both the mode of movement of the lens L to be inspected and the mode of movement of the lens optical axis symbol Ol with respect to the measurement optical axis symbol Oo, just by looking at the display unit 12. Can be grasped by.

Further, the lens meter 10 causes the display unit 12 to display the P-circle symbol Op, which indicates the amount of the prism stepwise, in addition to the measurement optical axis symbol Oo and the lens optical axis symbol Ol. Therefore, since the lens meter 10 can also grasp the prism amount at the measurement point of the lens L to be inspected, the lens to be inspected for matching the position of the measurement optical axis Lm with the position of the lens optical axis Ll. The movement of L can be made easier.

The lens meter 10 changes the mode of display on the display unit 12 according to the degree of closeness between the measurement optical axis symbol Oo and the lens optical axis symbol Ol. Therefore, the lens meter 10 can grasp at a glance the degree of closeness between the position of the measurement optical axis Lm and the position of the lens optical axis Ll, so that the position of the lens optical axis Ll can be determined by the position of the measurement optical axis Lm. The movement of the lens L to be inspected for matching with can be made easier.

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.

The lens meter 10 causes the display unit 12 to display the lens L to be inspected as a lens image IL while being placed on the lens receiver 14 and pressed against the lens table 15. Therefore, the lens meter 10 confirms the positional relationship between the lens L to be inspected and the lens receiver 14 in the lens image IL, so that the lens L to be inspected is not floating from the lens receiver 14 or the like. It is possible to confirm whether or not the posture is appropriate. Further, the lens meter 10 can confirm whether or not the lens L to be examined is tilted by confirming the positional relationship between the lens L to be examined and the lens table 15 in the lens image IL. These things make it possible to secure the measurement accuracy of the optical characteristic values (spherical power, cylindrical power, cylindrical axis angle, prism power, prism base direction, etc.) of the lens L to be inspected by the measurement optical system 20. Therefore, in addition to matching the position of the measurement optical axis Lm with the position of the lens optical axis Ll, the lens meter 10 can secure the measurement accuracy other than the position of the lens optical axis Ll, and is based on the measurement accuracy. It is possible to display the lens optical axis symbol Ol at an appropriate position on the P circle symbol Op.

Therefore, in the lens meter 10 as an embodiment of the lens meter according to the present disclosure, the position of the measurement optical axis Lm of the measurement optical system 20 and the lens to be inspected are grasped by the display unit 12 while grasping the actual movement of the lens L to be inspected. The position of the lens optical axis Ll of L can be matched.

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, as the lens position symbol, there is a position where the prism value of the lens L to be inspected becomes 0 with respect to the measurement optical axis Lm (measurement optical axis symbol Oo), and the P circle symbol Op. The lens optical axis symbol Ol is displayed at a position indicating the prism value at the location measured above. However, the lens position symbol indicates the position of the lens L to be inspected so as to assist in matching the position of the measurement optical axis Lm of the measurement optical system 20 with the position of the lens optical axis Ll of the lens L to be inspected. It suffices, and is not limited to the configuration of the first embodiment. As another example of the lens position symbol, the image generation unit 45 displays the lens optical axis symbol Ol on the XY coordinates representing the eccentricity (mm) instead of the prism coordinate system indicated by the P circle symbol Op. Be done. The amount of eccentricity can be obtained (converted) from the spherical power and the prism value by a known Prentice formula. In this case, the image generation unit 45 sets the eccentricity (mm) as the object image IO with the measurement optical axis Lm as the center, the horizontal direction as the X axis, and the vertical direction as the Y axis when the front view of FIG. 7 and the like. Generate an XY coordinate symbol indicating the XY coordinates to be represented. Then, the image generation unit 45 is in the direction in which there is a position where the eccentricity is 0 with respect to the measurement optical axis Lm (measurement optical axis symbol Oo), and is a position indicating the converted eccentricity on the XY coordinate symbols. Is displayed with the lens optical axis symbol Ol. At this time, if the scale of the lens image IL and the scale of the XY coordinate symbol are aligned, the lens optical axis symbol Ol indicates the actual position of the lens optical axis Ll in the lens image IL. With such a configuration, the amount of eccentricity (mm) can be grasped, so that even an inexperienced user can see the position of the measurement optical axis Lm and the lens optical axis Ll without looking at the actual lens L to be inspected. The position can be matched more appropriately.

Further, in the first embodiment, the measurement optical axis symbol Oo and the lens optical axis symbol Ol are displayed on the display unit 12. However, the measurement optical axis symbol (Oo) may indicate the position of the measurement optical axis Lm of the measurement optical system 20, and the lens optical axis symbol (Ol) indicates the position of the lens optical axis Ll of the lens L to be inspected. It does not have to be limited to the configuration (aspect) of the first embodiment.

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 41 Control unit IL Lens image L Lens to be inspected Ol Lens optical axis symbol Oo Measurement optical axis symbol Op P Circle symbol

Claims (6)

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 superimposes the lens image acquired by the imaging unit on the measurement optical axis symbol indicating the optical axis position of the measurement optical system and the lens position symbol indicating the position of the lens to be inspected. A lens meter characterized by displaying on a unit. The lens meter according to claim 1, wherein the lens position symbol is a lens optical axis symbol indicating a position where the prism value of the lens under test becomes 0. The first aspect of claim 1, wherein the lens position symbol is a lens optical axis symbol indicating a position where the amount of eccentricity of the optical axis position of the test lens with respect to the optical axis position of the measurement optical system is zero. Lens meter. The second or third aspect of the present invention, wherein the control unit changes the mode of display on the display unit according to the degree of proximity of the measurement optical axis symbol and the lens optical axis symbol. Lens meter. The imaging unit acquires a moving image in a predetermined range centered on the optical axis position of the measurement optical system as the lens image.
The lens meter according to any one of claims 1 to 4, wherein the control unit displays a moving image of the lens image on the display unit in real time. Claims 1 to 5, wherein the control unit displays a P-circle symbol indicating the amount of prism in a stepwise manner on the display unit in addition to the measurement optical axis symbol and the lens position symbol. The lens meter according to any one item.

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