JP6885764B2 - Lens meter - Google Patents

Description

The present disclosure relates to a lens meter.

Conventionally, the measurement light from the light source is projected onto the test lens to receive the measurement light that has passed through the test lens, and the optical characteristic value of the test lens is calculated based on the received measurement light. Then, there is known a lens meter that changes the display size of a mapping image showing the calculated distribution of optical characteristic values on a display according to the actual size of the lens to be inspected (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2006-105868

However, in the conventional lens meter, in order to confirm the positional relationship between the optical characteristic distribution shown in the mapping image and the lens to be inspected, it is necessary to superimpose the actual lens to be inspected on the display. Therefore, it is not possible to confirm the positional relationship between the optical characteristic distribution of the test lens and the test lens, and there arises a problem that the positional relationship between the optical characteristic distribution and the test lens is difficult to understand.

This disclosure focuses on the above problems, and provides a lens meter that can easily grasp the distribution of optical characteristic values and the positional relationship with the test lens during measurement of the optical characteristics of the test lens. The purpose is to provide.

In order to achieve the above object, the lens meter of the present disclosure passes through a projection optical system that projects measurement light onto the lens to be examined and the lens to be examined in order to achieve the above object. A pattern plate that separates the measured light into a plurality of divided measurement light beams, a screen on which the plurality of divided measurement light beams separated by the pattern plate are projected, and an image of the plurality of divided measurement light beams projected on the screen are measured. The optical characteristic value of the lens to be inspected is determined based on an image of a light receiving optical system having an imaging optical system for forming an image on the light receiving element for measurement and a plurality of divided measurement light beams formed on the light receiving element for measurement. An optical characteristic calculation unit to be calculated, a mapping forming unit that forms a mapping image representing the distribution of the optical characteristic value of the test lens based on the optical characteristic value, and a lens image obtained by imaging the test lens. The image control unit is provided, and an image control unit that generates a superposed image in which the mapping image and the lens image are superimposed in a state of matching the magnification and displays the superimposed image on the display unit.
Then, in the lens region of the test lens, an image showing the distribution of the optical characteristic values in the region where the distribution of the optical characteristic values of the test lens cannot be shown by the mapping image is estimated and shown as the first image. As an object image, the image control unit superimposes and displays the first object image on the superimposed image.

As a result, the distribution of the optical characteristic values and the positional relationship with the test lens can be easily grasped during the measurement of the optical characteristics of the test lens.

It is a perspective view which shows the appearance of the lens meter of Example 1. FIG. It is explanatory drawing which shows the structure of the measurement optical system of the lens meter of Example 1. FIG. It is a top view which shows an example of the Hartmann plate provided in the light receiving optical system of Example 1. FIG. It is a block diagram which shows the structure of the control system of the lens meter of Example 1. FIG. It is explanatory drawing which shows an example of the 1st superimposition image generated by the lens meter of Example 1. FIG. It is explanatory drawing which shows an example of the 2nd superimposition image generated by the lens meter of Example 1. FIG. It is a flowchart which shows the flow of the image control processing executed by the lens meter of Example 1. It is explanatory drawing which shows the contour shape of the mapping image. It is explanatory drawing which shows the example of the superimposition image when the mapping image is extended to the whole area of the lens area of the test lens.

Hereinafter, embodiments for carrying out the lens meter of the present invention will be described with reference to Example 1 shown in the drawings.

(Example 1)
[Overall configuration of lens meter]
Hereinafter, the overall configuration of the lens meter 1 of the first embodiment will be described with reference to FIG.
The lens meter 1 shown in FIG. 1 measures the optical characteristics of the lens L to be inspected, calculates the optical measurement value, and displays the distribution of the optical measurement value as a mapping image. The lens meter 1 has a device main body 2.

The apparatus main body 2 is composed of a liquid crystal display, an organic EL display, or the like on the upper part of the front surface, and is provided with a display unit 3 having a touch panel type display screen 3a. On the display screen 3a, numerical data of the optical characteristic values of the lens L to be inspected (spherical power, cylindrical power, cylindrical axis angle, prism power, addition power, prism base direction, etc.) and optical characteristic values of the lens L to be tested are displayed. Various image data such as a mapping image showing the distribution, a lens image of the lens L to be inspected, and a superimposed image in which the lens image is superimposed on the mapping image are displayed. Further, on the display screen 3a, an operation button for performing operations such as starting and stopping measurement, a mode switching button for switching the measurement mode, a selection button for selecting the superimposed image to be displayed, and the like are indicated by icons. The operation unit is displayed. The operation unit may be configured by appropriately providing buttons, switches, or the like on the device main body 2.

In the apparatus main body 2, the light projecting optical system 10 (see FIG. 2) is housed in the upper portion 2a, and the light receiving optical system 20 (see FIG. 2) is located in the lower portion 2b facing below the light projecting optical system 10. It is contained. The light projecting optical system 10 and the light receiving optical system 20 constitute a measuring optical system K for measuring the optical characteristics of the lens L to be inspected.
Further, an imaging unit 30 (imaging apparatus, see FIG. 2) for imaging the appearance of the lens L to be inspected is housed in the upper portion 2a of the apparatus main body 2.

A lens set space 2c for setting the lens L to be inspected is formed in the middle portion of the apparatus main body 2, and a lens holding mechanism 4 is provided inside the lens set space 2c. The lens holding mechanism 4 includes a lens pressing member 4a that rotates in the vertical direction to press the lens L to be inspected from above, a support pin 4b that points-supports the lens L to be inspected from below, and a lens set space 2c. It has a lens holding member 4c that assists in positioning the lens L to be inspected. Here, when the lens L to be inspected is placed on the lower support pin 4b and the operation button is turned ON, the lens holding member 4a is driven by the drive mechanism to rotate downward, and the lens holding member 4c The position is driven by the drive mechanism, and the set position of the test lens L (the position of the test lens L with respect to the measurement optical axis Lm of the measurement optical system K) is automatically adjusted.
In the first embodiment, as the lens L to be inspected, as shown in FIG. 1, a pair of lenses LL and LR framed in the left and right lens frames FL and FR of the spectacle frame F are applied. Therefore, a pair of lens pressing members 4a and support pins 4b are provided corresponding to the pair of lenses LL and LR.

Further, the lens meter 1 of the first embodiment is a marking device for marking the lens L to be inspected held by the lens holding mechanism 4 in the lens set space 2c, and a nose pad provided on the spectacle frame F. A nose pad support portion may be provided to support the lens.

[Detailed configuration of measurement optical system]
Hereinafter, the detailed configuration of the measurement optical system K of the lens meter 1 of the first embodiment will be described with reference to FIGS. 2 and 3. The measurement optical system K of the first embodiment is for measuring the optical characteristic value of the lens L to be inspected, and has the light projecting optical system 10 and the light receiving optical system 20 as described above. Further, the lens meter 1 of the first embodiment has a pair of measurement optical systems K, and can simultaneously measure a pair of lenses LL and LR applied as the lens L to be inspected.

The projection optical system 10 is an optical system that projects measurement light onto the lens L to be inspected, and as shown in FIG. 2, a light source 11 that emits measurement light and measurement light from the light source 11 are combined. It has a collimator lens 12 that emits parallel light to the test lens L. Here, the light source 11 is composed of an LED (light emitting diode). In order to make the lens meter 1 compact, a mirror may be used to reflect the measurement light from the light source 11 to refract the optical path.

The light receiving optical system 20 is an optical system that is arranged on the measurement optical axis Lm and receives the measurement light that has passed through the lens L to be inspected, and is the Hartmann plate 21 (pattern plate) as shown in FIG. , A screen 22, a field lens 23 (imaging optical system), an imaging lens 24 (imaging optical system), and a CCD (Charge Coupled Devise, light receiving element for measurement) 25.

The Hartmann plate 21 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 Hartmann plate 21 is formed with a large number of circular openings 21a arranged two-dimensionally at equal intervals. The openings 21a are arranged vertically and horizontally at intervals of, for example, 2 mm. The measurement light transmitted through the lens L to be inspected is separated (converted) into a plurality of divided measurement light fluxes by passing through the opening 21a formed in the Hartmann plate 21.

A plurality of divided measurement luminous fluxes separated by passing through the opening 21a of the Hartmann plate 21 are projected on the screen 22. The projection position of each of the plurality of divided measurement luminous fluxes is displaced on the screen 22 according to the optical characteristic value of the lens L to be inspected. As a result, the projection pattern of the plurality of divided measurement luminous fluxes on the screen 22 is reduced / enlarged or distorted. The lens meter 1 of the first embodiment is an apparatus configured to obtain the optical characteristic value of the lens L to be inspected by analyzing the projection patterns of the plurality of divided measurement luminous fluxes.

The plurality of divided measurement luminous fluxes projected on the screen 22 are imaged on the CCD 25 arranged in conjugation with the screen 22 via the field lens 23 and the imaging lens 24, which are imaging optical systems.

The CCD 25 receives the plurality of divided measurement luminous fluxes, converts them into electric signals (image signals), and outputs the signals. 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 position coordinates on the pixels of the CCD 25.

[Detailed configuration of imaging unit]
Hereinafter, the detailed configuration of the imaging unit 30 of the lens meter 1 of the first embodiment will be described with reference to FIG.
The imaging unit 30 is arranged between the pair of projection optical systems 10 and images the lens L held by the lens holding mechanism 4 from a direction parallel to the measurement optical axis Lm of each projection optical system 10. Here, the entire pair of lenses LL and LR of the lens L to be inspected held by the lens holding mechanism 4 are attached at positions where they can be simultaneously imaged.
The image pickup unit 30 is, for example, a monocular digital camera, and includes 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 forms a subject image of the test lens L held by the lens holding mechanism 4 on the image pickup element 32.

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.

[Detailed configuration of control system]
Hereinafter, the detailed configuration of the control system of the lens meter 1 of the first embodiment will be described with reference to FIG.
The lens meter 1 of the first embodiment is composed of a CPU (Central Processing Unit) 40, a ROM (Read Only Memory), an HDD (Hard Disk Drive), an EEPROM (Electrically Erasable Programmable ROM), and the like, and stores necessary control programs. It has a stored storage unit 41.

The CPU 40 expands the control program stored in the storage unit 41 on an internal memory configured by, for example, a RAM (Random Access Memory), thereby controlling the operation of each part of the lens meter 1 and calculating the optical characteristic value. To execute. The CPU 40 operates as a control unit 42, an optical characteristic calculation unit 43, a mapping formation unit 44, and an image control unit 45 according to this control program.

The control unit 42 comprehensively controls the operation of each unit of the lens meter 1. That is, for example, control of the lighting / extinguishing operation of the light source 11 of the floodlight optical system 10, an image signal input from the CCD 25, a mapping image formed by the mapping forming unit 44, an image pickup signal input from the image pickup element 32, and the like. The storage process / reading process of the superimposed image or the like formed by the image control unit 45 to the storage unit 41 is performed.

The optical characteristic calculation unit 43 is based on the image signal input from the CCD 25, that is, the image of the plurality of divided measurement light beams imaged on the CCD 25, and the spherical power, the cylindrical power, and the cylindrical axis angle of each part of the lens L to be inspected. , Prism power, prism base direction, and other optical characteristic values are calculated. The calculated numerical data of the optical measurement value is output to the mapping forming unit 44 and the image control unit 45.
Here, the 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 position coordinates on the pixels of the CCD 25. In each divided measurement luminous flux, the light receiving position on the CCD 25 is displaced according to the optical characteristic value of the lens L to be inspected, so that the pattern formed on the CCD 25 is reduced, enlarged, or distorted. The optical characteristic calculation unit 43 obtains the optical characteristic value of the lens L to be inspected by analyzing the projection patterns of the plurality of divided measurement luminous fluxes.

The mapping forming unit 44 performs a process of forming a mapping image showing the distribution of the optical characteristic values of the lens L to be examined. In the mapping forming unit 44, among the optical characteristic values of the optical characteristic values of the respective measurement positions of the lens L calculated by the optical characteristic calculation unit 43, the measurement positions having the same optical characteristic value are connected by an equal frequency line like an contour line. A mapping image showing the distribution of the optical characteristic values of the lens L to be inspected is formed. The image data of the formed mapping image is output to the image control unit 45.
The mapping image illustrated in FIG. 5 is a composite map showing the distribution of spherical power (S) and cylindrical power (C).

The image control unit 45 superimposes the mapping image formed by the mapping forming unit 44 and the lens image of the test lens L imaged by the imaging unit 30, generates a superposed image, and displays the generated superposed image. Control is performed to display the image on the unit 3. The image control unit 45 includes a lens image acquisition unit 45a, an optical characteristic data acquisition unit 45b, a lens image data acquisition unit 45c, a superimposed image generation unit 45d, and a display control unit 45e.

The lens image acquisition unit 45a acquires a lens image imaged by the image pickup unit 30 from an image pickup signal input from the image pickup element 32 of the image pickup unit 30, that is, a subject image photoelectrically converted by the image pickup element 32. That is, the lens image acquisition unit 45a performs necessary processing and processing (for example, coordinate conversion, contrast adjustment, color conversion (translucency, sepia color, etc.), brightness, etc.) on the image captured by the imaging unit 30. Adjustment, filtering, etc., including processing to make the lens image less noticeable than the mapping image) is performed to obtain a desired lens image. The acquired image data of the lens image is output to the lens image data acquisition unit 45c and the superimposed image generation unit 45d. The lens image to be acquired is a still image.

The optical characteristic data acquisition unit 45b detects the characteristic points (feature points) of the lens L to be inspected based on the optical characteristic values calculated by the optical characteristic calculation unit 43, and also on the mapping image of the characteristic points. Detect the coordinate position. The coordinate position information of the detected feature points is output to the superimposed image generation unit 45d. The "feature point (feature point) of the lens L to be inspected" is a portion of the lens L to be inspected that is optically characteristic, and is the distance dioptric power measurement position (point F) of the lens L to be inspected and the near vision. The frequency measurement position (N point), the distance point, the near point, the center line of the progressive zone, the length of the progressive zone, and the like can be mentioned.

The lens image data acquisition unit 45c detects the outer peripheral edge of the lens L to be inspected in the lens image based on the lens image acquired by the lens image acquisition unit 45a, and displays the outer peripheral edge on the lens image of the outer peripheral edge. Detect the coordinate position. Further, the lens image data acquisition unit 45c determines whether or not the index is provided on the lens L to be inspected based on the lens image, and if it is determined that the index is provided, the index is displayed on the lens image. Detects the coordinate position of the index at. The coordinate position information of the detected index is output to the superimposed image generation unit 45d. The "index on the lens L to be inspected" is directly drawn, engraved, or affixed on the lens L to be inspected, such as a stamp mark with a stamp ink, a magic mark indicating an eye point, and a paint mark. It is a mark that has been used.

The superimposed image generation unit 45d superimposes the mapping image formed by the mapping forming unit 44 and the captured image acquired by the lens image acquisition unit 45a, and generates a first superimposed image in which the mapping image and the lens image are superimposed. To do. At this time, the magnification of the mapping image with respect to the test lens L and the magnification of the lens image with respect to the test lens L are matched, and the magnification of the mapping image and the lens image is matched. When superimposing the mapping image and the lens image, first, the reference position in the map is set in the mapping image, and the reference position in the imaging image is set in the lens image. Then, the arrangement (position, orientation, etc.) of the mapping image is determined so that the reference position in the map and the reference position in the imaging have a preset positional relationship, and the mapping image is superimposed on the lens image in the determined arrangement.
Note that FIG. 5 shows an example of the first superimposed image. In the first superimposed image shown in FIG. 5, the mapping image is superimposed on the region indicated by M in the lens image S. Further, in the first superimposed image shown in FIG. 5, an arbitrary display object H is superimposed and displayed in the lens image S. Here, in the "display object H", the spherical power (S), the cylindrical power (C), the cylindrical axis angle (A), and the prism power, which are the optical characteristic values of the pair of lenses LL and LR of the lens L to be inspected, respectively. (P), the addition frequency (ADD) is displayed numerically.

Further, the superimposed image generation unit 45d shows an object image showing the coordinate position of the feature point of the test lens L on the mapping image and the coordinate position of the index provided on the test lens L on the lens image. The object image is superimposed on the first superimposed image, and the first superimposed image and the second superimposed image including these object images are generated. At this time, the superimposed position of each object image is set so as to match the respective coordinate position on the mapping image or the lens image.
Note that FIG. 6 shows an example of the second superimposed image. In the second superimposed image shown in FIG. 6, the object image A showing the coordinate position of the distance point, the object image B showing the coordinate position of the near point, and the coordinate position of the center line of the progressive zone are shown with respect to the first superimposed image. The object image C showing the above and the object image D showing the coordinate position of the magic mark showing the eye point of the actual glasses wearer are superimposed.

Further, the superimposed image generation unit 45d generates a first superimposed image and a second superimposed image based on the coordinate positions of the outer peripheral edge of the lens L in the lens image detected by the lens image data acquisition unit 45c. Is adjusted to an image that includes at least a part of the outer peripheral edge of the lens L to be inspected. That is, by enlarging / reducing the lens image and the mapping image and adjusting the display range, at least a part of the outer peripheral edge of the lens L to be examined is reflected in both the first superimposed image and the second superimposed image. To do.
Then, the generated image data of the first superimposed image and the second superimposed image are appropriately output to the display control unit 45e.

In the superimposed image generation unit 45d, both the mapping image and the lens image are semi-transparently processed, and the mapping image and the lens image in the semi-transparent state are superimposed so that both are superimposed even in the area where both are superimposed. You may generate a superposed image in which the image of is visible.
In addition, either one of the mapping image and the lens image is processed to be semi-transparent, and when the mapping image and the lens image are superimposed, the translucent image is superimposed so as to be located in the front, so that the area where both are superimposed is formed. If there is, a superposed image in which both images can be visually recognized may be generated.
Further, an object image indicating the coordinate position of the feature point of the lens L to be inspected or an object image indicating the coordinate position of the index may be superimposed on the mapping image in the semitransparent state and the lens image.

The display control unit 45e outputs the image data of the first superimposed image or the second superimposed image generated by the superimposed image generation unit 45d to the display unit 3 and displays it on the display screen 3a of the display unit 3.
The control unit 42 controls whether to output the image data of the first superimposed image or the image data of the second superimposed image.

[Image control processing]
Hereinafter, an example of the image control process performed by the lens meter 1 of the first embodiment will be specifically described with reference to the flowchart of FIG.

In step S1, the control unit 42 determines whether or not the measurement button provided on the device main body 2 has been turned on. If YES (with ON operation), the process proceeds to step S2 assuming that the optical measurement of the lens L to be inspected is instructed. If NO (without ON operation), it is assumed that the optical measurement of the lens L to be inspected is not instructed, and step S1 repeat.

In step S2, following the determination that the measurement button in step S1 has an ON operation, the optical measurement of the lens L to be inspected is performed, and the process proceeds to step S3.
In the optical measurement of the test lens L, the measurement light is projected from the light source 11 of the light projecting optical system 10 toward the test lens L based on the control command from the control unit 42, and the test lens L is measured. This is performed by acquiring an image of the measurement light that has passed through the light receiving optical system 20. Further, in the first embodiment, since the pair of measurement optical systems K are provided, the optical measurement of the pair of lenses LL and LR can be performed at the same time.

In step S3, following the execution of the lens optical measurement in step S2, the optical characteristic calculation unit 43 calculates the optical characteristic value of the lens L to be inspected based on the images of the plurality of divided measurement luminous fluxes obtained by the optical measurement. Then, the process proceeds to step S4.

In step S4, following the calculation of the optical characteristic value in step S3, the mapping forming unit 44 forms a mapping image showing the distribution of the optical characteristic value on the lens L to be inspected, and proceeds to step S5.
Here, the mapping image is formed by connecting the measurement positions having the same optical characteristic value with the equal power line.

In step S5, following the formation of the mapping image in step S4, the characteristics of the lens L to be inspected are based on the optical characteristic value calculated in step S3 and the mapping image formed in step S4 by the optical characteristic data acquisition unit 45b. The coordinate position on the point mapping image is detected, and the process proceeds to step S6.
Here, the feature points for detecting the coordinate position are, for example, a distance point, a near point, and a progressive zone center line.

In step S6, following the detection of the feature point of the test lens L in step S5, the image pickup unit 30 takes an image of the test lens L, and the process proceeds to step S7. The captured image data is output to the lens image acquisition unit 45a.

In step S7, following the shooting of the lens L to be inspected in step S6, the lens image acquisition unit 45a performs necessary processing and processing on the captured imaging data to acquire a lens image, and proceeds to step S8. The acquired image data of the lens image is output to the lens image data acquisition unit 45c.

In step S8, following the acquisition of the lens image in step S7, the lens image data acquisition unit 45c analyzes the acquired lens image, detects the outer peripheral edge of the lens L to be inspected reflected in the lens image, and steps S9. Proceed to.
Here, the "outer peripheral edge of the lens L to be inspected" is an edge portion (contour) of the lens L to be inspected, and may be a boundary line between the lens frames FL and FR and the pair of lenses LL and LR. , Lens frame FL, FR may be used.

In step S9, following the detection of the outer peripheral edge of the lens in step S8, the lens image data acquisition unit 45c analyzes the lens image acquired in step S7, and the lens LL of the lens L to be inspected reflected in the lens image, Determine if the LR has an index. If YES (with index), the process proceeds to step S10, and if NO (without index), the process proceeds to step S11.
Here, the index to be detected is, for example, a stamp mark made on the lens L to be inspected by the stamp device or a magic mark indicating the position of the eye point.

In step S10, following the determination that there is an index in step S9, the coordinate position of the index determined to be provided on the lens L to be inspected by the lens image data acquisition unit 45c on the lens image is set to step S7. The lens image obtained is analyzed and detected, and the process proceeds to step S11.

In step S11, following the determination that there is no index in step S9 or the detection of the position coordinates of the index in step S10, the superimposed image generation unit 45d acquired the mapping image formed in step S4 and the mapping image in step S6. The first superimposed image is generated by superimposing the lens image and the lens image in a state where the magnifications with respect to the lens L to be examined are matched. Further, the first superimposed image is provided on the object image showing the coordinate position on the mapping image of the feature point of the test lens L detected in step S5 and the test lens L detected in step S10. The object image indicating the coordinate position on the lens image of the index is superimposed on the first superimposed image to generate the second superimposed image. Further, the magnification and the display range are adjusted so that the first and second superimposed images include the outer peripheral edge of the lens L to be examined detected in step S8, and the final first and second superimposed images are generated. , Step S12.
Here, the arrangement (position, orientation, etc.) of the mapped image is determined so that the reference position in the map set in the mapped image and the reference position in the imaging set in the lens image have a preset positional relationship. ..

In step S12, following the generation of the first and second superimposed images in step S11, the display control unit 45e displays the image data of the first superimposed image or the second superimposed image generated in step S11 on the display unit 3. On the other hand, the first superimposed image or the second superimposed image is displayed on the display screen 3a of the display unit 3.

Next, the operation and effect of the lens meter 1 of the first embodiment will be described.
In the lens meter 1 of the first embodiment, after the lens L to be inspected is set in the lens holding mechanism 4, the process proceeds from step S1 → step S2 → step S3 in the flowchart shown in FIG. 7, and optical measurement of the inspected lens L is performed. Then, the optical measurement value is calculated. Then, the process proceeds to step S4, and a mapping image showing the distribution of the optical measurement values of the lens L to be inspected is formed based on the calculated optical measurement values.

When the mapping image is formed, the process proceeds to step S5, and the coordinate position of the feature point of the test lens L is detected based on the optical characteristic value of the test lens L and the mapping image. Here, the lens L to be inspected is a progressive lens, and the feature points are a distance point, a near point, and a progressive zone center line.

Subsequently, the process proceeds from step S6 to step S7, and the imaging unit 30 photographs the lens L to be inspected to acquire a lens image of the lens L to be inspected.

After acquiring the lens image of the lens L to be inspected, the process proceeds to step S8, and the lens image of the lens L to be inspected is analyzed to detect the coordinate position of the outer peripheral edge of the lens L to be inspected. Here, the lens frames FL and FR of the spectacle frame F are detected as the outer peripheral edge of the lens L to be inspected.

When the outer peripheral edge of the lens is detected, the process proceeds from step S9 to step S10, and when it is determined that the index is provided on the lens L to be examined, the lens image of the lens L to be examined is analyzed and provided on the lens L to be examined. Detect the coordinate position of the index. Here, the index is a magic mark indicating an eye point provided on the lens L to be inspected.

After forming the mapping image in this way, acquiring the lens image, and detecting the coordinate position of the feature point of the lens L to be examined, the coordinate position of the outer peripheral edge of the lens L to be examined, and the coordinate position of the index, step S11 To generate a superposed image (first superposed image) in which the mapping image showing the distribution of the optically measured values and the lens image of the lens L to be examined are superposed in a state of matching the magnifications (see FIG. 5). .. Further, the mapping image showing the distribution of the optical measurement values and the lens image of the lens L to be examined are superimposed in a state where the magnifications are matched, and the feature points (distance point, near point, progressive point) of the lens L to be examined are superimposed. A second superimposed image is generated by superimposing an object image showing the coordinate position of the band center line) and an object image showing the coordinate position of the index (magic mark of the eye point) provided on the lens L to be inspected (Fig.). 6).

Then, after the first superimposed image and the second superimposed image are generated, the process proceeds to step S12, and the superimposed image (first superimposed image or second superimposed image) is displayed on the display screen 3a of the display unit 3 at an appropriate timing. Let me.

As a result, the measurer of the test lens L can simultaneously grasp the optical characteristic distribution of the test lens L and the appearance of the test lens L by visually observing the display screen 3a of the display unit 3. The positional relationship between the inspection lens L and the optical characteristic distribution can be confirmed. That is, it is not necessary to move the test lens L to overlap the display screen 3a during the measurement, and while measuring the optical characteristics of the test lens L, the distribution of the optical characteristic values and the actual position of the test lens L are measured. The relationship can be easily grasped.

Further, in the first embodiment, when the second superimposed image (see FIG. 6) is displayed, the feature points and indexes are further added to the first superimposed image in which the mapping image and the lens image of the lens L to be examined are superimposed. Object images showing the coordinate positions are superimposed and displayed.

As a result, the coordinate positions of the feature points (distance point, near point, progressive zone center line) of the lens L to be inspected are emphasized and displayed, and by visually observing the display screen 3a of the display unit 3, the lens to be inspected is displayed. It is possible to easily confirm at which position of L the distance optical center, the near optical center, and the progressive zone center line are formed. Therefore, the positional relationship between the feature point of the test lens L and the test lens L can be easily grasped.

Further, by emphasizing and displaying the feature points, for example, when the subject lens L is a bifocal lens or a trifocal lens, the position of the small lens becomes clear, and the measurement calculation of the spherical power of the test lens L and the like becomes clear. It becomes possible to assist.

Further, in the first superimposed image in which the lens image and the mapped image are superimposed, the index provided on the lens L to be inspected is hidden by the mapped image. On the other hand, the coordinate position of the index can be displayed by superimposing the object image indicating the coordinate position of the index (magic mark of the eye point) provided on the lens L on the first superimposed image. As a result, even if the optical characteristic distribution of the test lens L and the lens image of the test lens L are superimposed, the position of the index provided on the test lens L can be confirmed, and this index and the optical characteristic distribution can be confirmed. It is possible to grasp the positional relationship of.

Further, in the first embodiment, the magnification and the display area of the first superimposed image (see FIG. 5) or the second superimposed image (see FIG. 6) are adjusted, and the outer peripheral edge (glasses frame F) of the test lens L is adjusted. It is included in the first and second superimposed images. That is, the spectacle frame F is adjusted so as to appear in the first and second superimposed images.
As a result, the boundary between the lens L to be examined and its peripheral region (contour of the lens L to be examined) can be reliably displayed on the display unit 3, and the lens region of the lens L to be examined can be clearly grasped. .. Therefore, it is possible to assist the measurement calculation of the spherical power of the lens L to be inspected.

An object image that emphasizes the outer peripheral edge (for example, the spectacle frame F) may be superimposed and displayed along the coordinate position of the outer peripheral edge of the lens L to be inspected. As a result, the lens region of the lens L to be inspected is emphasized and displayed, and the lens region can be grasped more clearly.

Further, as shown in FIG. 8A, for example, in the mapping image G superimposed on the region M in the lens image S, the peripheral edge (contour) Ga is smooth due to the influence of a large number of openings 21a formed in the Hartmann plate 21. It does not become a smooth curve, but is expressed in a so-called jagged pattern. On the other hand, if the coordinate position of the outer peripheral edge (glasses frame F) of the lens L to be examined is detected, the lens region of the lens L to be examined can be grasped. Therefore, it is possible to determine a region (region X indicated by dots in FIG. 8A) in which the optical characteristic distribution cannot be shown in the mapping image G even within the lens region. As a result, the optical characteristic distribution of this region X is estimated, and as shown in FIG. 8B, an object image (shown by a broken line in FIG. 8) showing the estimated optical characteristic distribution is superimposed on the superimposed image. As a result, the optical characteristic distribution can be expanded and displayed over the entire lens region of the lens L to be inspected, and the optical characteristic distribution over the entire lens region can be grasped.

That is, by detecting the coordinate position of the outer peripheral edge of the lens L to be inspected, the lens region of the lens L to be inspected can be grasped, and the optical characteristic distribution of the region that cannot be shown in the mapping image can be estimated and displayed. It becomes.

Further, in the first embodiment, at least one of the mapping image and the lens image is processed to be semi-transparent, and the mapping image and the lens image are superposed so that the semi-transparent image is located in the foreground, and both are superimposed regions. However, if you generate a superposed image in which both images are visible,
These positions can be grasped from the superimposed image without detecting the feature points of the test lens L based on the mapping image or detecting the index provided on the test lens L based on the lens image. As a result, the processing load of the image control unit 45 can be reduced.

Although the lens meter of the present invention has been described above based on the first embodiment, the specific configuration is not limited to this embodiment, and the gist of the invention according to each claim of the claims. Design changes and additions are permitted as long as they do not deviate from.

In the first embodiment, a pair of lenses LL and LR framed in the left and right lens frames FL and FR of the spectacle frame F are applied as the lens L to be inspected, and the measurement optical system K corresponds to the pair of lenses LL and LR. However, the present invention shows an example in which the imaging unit 30 can simultaneously image the entire pair of lenses LL and LR of the lens L to be inspected, but the present invention is not limited to this.
For example, the lens L to be inspected may be an unprocessed lens or a frame-processed lens that is not framed in the spectacle frame. Further, the measurement optical system K may be provided with at least one, and the imaging unit 30 can be provided at an arbitrary position as long as at least a part of the lens L to be photographed can be photographed.

Further, in the first embodiment, in both the first superimposed image shown in FIG. 5 and the second superimposed image shown in FIG. 6, the entire spectacle frame F and the pair of lenses LL and LR are displayed at the same time. Shown, but not limited to this. Arbitrary regions of the mapping image and the lens image may be enlarged or reduced, and a part of the lens L to be inspected may be displayed on the display screen 3a of the display unit 3, for example, as shown in FIGS. 8A and 8B.

Further, in the first embodiment, an example of detecting a distance point, a near point, and a progressive zone center line as "feature points" to be displayed on the second superimposed screen is shown, but the present invention is not limited to this. If it is an optically characteristic part that can be detected based on the optical characteristic value in the lens L to be inspected, such as a geometric optical center, a prism measurement point, a progressive zone length, an eye point, etc., it can be detected as a feature point. Good.

Further, the "index" displayed on the second superimposed screen is not limited to the magic mark indicating the eye point shown in the first embodiment and the mark point mark, and may be a hidden mark provided on the lens L to be inspected. ..

Further, in Example 1, an example is shown in which the optical characteristics are measured after the test lens L is set to form a mapping image, and then the test lens L is photographed to acquire a lens image, but the present invention is not limited to this. .. For example, after the test lens L is set, the image of the test lens L is taken first. Then, after acquiring the lens image, the optical characteristics may be measured. Further, in the case of performing moving image shooting or the like, the shooting may be continuously performed for an arbitrary period regardless of the set state of the lens L to be inspected.

Further, in the first embodiment, an example in which the imaging unit 30 is configured by a monocular digital camera arranged between a pair of floodlight optical systems 10 is shown. However, for example, the imaging unit 30 is configured by a compound eye digital camera. Alternatively, the imaging unit 30 may be configured by a plurality of monocular cameras.
Further, when a compound eye camera or a plurality of monocular cameras are used, the captured images may be combined to generate a lens image.

Further, in the first embodiment, an example is shown in which the imaging unit 30 is built in the upper portion 2a of the apparatus main body 2 and the mounting position of the imaging unit 30 is set between the pair of projection optical systems 10, but the present invention is not limited to this. .. The imaging unit 30 may be provided, for example, on the surface of the wall surface forming the lens set space 2c formed in the apparatus main body 2, the lens pressing member 4a, the lens holding member 4c, or the like. Further, the imaging unit 30 may be provided at a connecting portion between the light projecting optical system 10 and the light receiving optical system 20, or may be provided at a position where photography can be performed at an angle of looking up from below the light receiving optical system 20.
That is, the mounting position of the imaging unit 30 can be arbitrarily set as long as the lens L to be imaged can be imaged.

Further, the lens pressing member 4a may be formed of a sheet metal having a rigidity higher than that of plastic and may be thinned in thickness and width so as not to interfere with the imaging of the lens L to be inspected. Further, the lens pressing member 4a or the like may be formed of a transparent resin so as not to interfere with the imaging of the lens L to be inspected.

Although the first embodiment shows an example in which the lens image is a still image, it may be a moving image. That is, the state in which the test lens L is being measured may be captured as a moving image by an imaging unit that is a video camera, and the mapped image may be superimposed on the acquired moving image.
In this case, the state of being photographed can be confirmed in real time, and the measurer can measure the lens L to be inspected with peace of mind.

Then, in Example 1, an example is shown in which the Hartmann plate 21 as shown in FIG. 3 is used as a pattern plate for separating the measurement light passing through the test lens L into a plurality of divided measurement luminous fluxes, but the present invention is not limited to this. .. Any pattern plate that can separate the measurement light can be used.

1 Lens meter 3 Display unit 4 Lens holding mechanism K Measurement optical system 10 Floodlight optical system 11 Light source 12 Collimator lens 20 Light receiving optical system 21 Hartmann plate (pattern plate)
22 Screen 23 Field lens (imaging optical system)
24 Imaging lens (imaging optical system)
25 CCD (light receiving element for measurement)
30 Imaging unit 40 CPU
41 Storage unit 42 Control unit 43 Optical characteristic calculation unit 44 Mapping formation unit 45 Image control unit 45a Lens image acquisition unit 45b Optical characteristic data acquisition unit 45c Lens image data acquisition unit 45d Superimposed image generation unit 45e Display control unit L Inspected lens

Claims (5)

A projection optical system that projects measurement light onto the lens under test,
A pattern plate that separates the measurement light that has passed through the test lens into a plurality of divided measurement luminous fluxes, a screen on which the plurality of divided measurement light fluxes separated by the pattern plate are projected, and a plurality of divisions projected on the screen. A light receiving optical system having an imaging optical system for forming an image of a measured luminous flux on a light receiving element for measurement,
An optical characteristic calculation unit that calculates an optical characteristic value of the lens under test based on images of a plurality of divided measurement luminous fluxes formed on the light receiving element for measurement.
A mapping forming unit that forms a mapping image showing the distribution of the optical characteristic values of the test lens based on the optical characteristic values, and a mapping forming unit.
An imaging unit that images the lens under test and acquires a lens image,
An image control unit that generates a superposed image in which the mapping image and the lens image are superimposed in a state of matching the magnification and displays the image on the display unit.
With
The first object image shows an image in which the distribution of the optical characteristic values of the test lens cannot be shown by the mapping image in the lens region of the test lens by estimating the distribution of the optical characteristic values. age,
The image control unit is a lens meter characterized in that the first object image is superimposed on the superimposed image and displayed. The lens meter according to claim 1, wherein the image control unit detects the outer peripheral edge of the test lens based on the lens image, and includes the outer peripheral edge of the test lens in the superimposed image. The image control unit detects an optical feature point of the test lens based on the optical characteristic value of the test lens, and superimposes a second object image indicating the coordinate position of the feature point on the superposed image. The lens meter according to claim 1 or 2, wherein the lens meter is characterized in that. The image control unit detects an index provided on the lens to be inspected based on the lens image, and superimposes a third object image indicating the coordinate position of the index on the superimposed image. The lens meter according to any one of claims 1 to 3. The image control unit processes at least one of the mapping image and the lens image semitransparently, and the semitransparently processed image positions the front surface in the front surface and superimposes the mapping image and the lens image. The lens meter according to any one of claims 1 to 4, wherein the lens meter is characterized by the above.

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