JP2002098616A - Lens meter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lens meter capable of automatically obtaining the refraction characteristic values of the predetermined diopter (allowable diopter) ranges of a long-range part and a close-range part and automatically and accurately displaying mapping display in which the predetermined diopter ranges are simultaneously displayed with boundary lines which indicate boundaries with a distortion region. SOLUTION: In the lens meter, in the case that a lens L to be inspected is a progressive multi-point lens, an arithmetic control circuit 13 obtains the boundary lines 26 and 27 at which a cylindrical diopter obtained by subtracting the cylindrical diopter C0 of the long-range part from the cylindrical diopter Cx of a large number of points of the lens L to be inspected becomes equal to a predetermined value or more and displays it on a display means and obtains a range at which the cylindrical diopter of the large number of points of the lens L to be inspected is equal to a set value or less, of which the spherical diopter of the coordinates is of the approximately same diopter (diopter in the allowable range), and which is equal to a predetermined area or larger as a long range 50a or a close range 52a, and the obtained long range 50a or the close range 52a is displayed on a display device 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a lens meter for displaying a refraction characteristic value of a test lens by mapping.

[0002]

2. Description of the Related Art A conventional lens meter is proposed in which the addition of a progressive portion of a progressive multifocal lens is displayed in a two-dimensional (planar) image (see Japanese Patent Application Laid-Open No. 5-281090). Have been. However, with this lens meter, it is impossible to accurately know the addition power of the entire area of the progressive portion even though the addition power of the progressive portion is known.

Further, in the conventional lens meter, a boundary between a distance portion of a progressive multifocal lens and a progressive portion continuous therewith and a distortion region is obtained, and the obtained boundary is two-dimensionally (planarly).
(See Japanese Patent Application No. 8-259170).

This lens meter detects refraction characteristics at many points at the same time by using a perforated aperture plate having a large number of small holes or a lens array plate having a large number of lenses.
There is also a mapping display in which refraction characteristics at many points are obtained by calculation from detection signals, and refraction characteristics are mapped and displayed based on the refraction characteristic values at many points.

In this case, when it is desired to know the refraction characteristic of a specific portion after the mapping display, it is considered that the refraction characteristic value of the specified portion is displayed by designating the portion on the mapping image. The perforated aperture plate and lens array plate are used by being arranged between the light source of the measurement light beam projection optical system and the lens to be inspected or between the lens to be inspected and the area CCD (two-dimensional sensor) of the light receiving optical system. Can be

When the aperture plate or the lens array plate is disposed between the light source of the measuring light beam projection optical system and the lens to be measured, the light beam from the light source is converted into a parallel light beam by a collimator lens. The parallel light beam is formed into a large number of measurement light beams by using a perforated aperture plate or a lens array plate and projected onto the lens to be measured, and the large number of measurement light beams transmitted through the lens to be measured is received by the area CCD, and is transmitted from the area CCD. The refraction characteristic values at a number of points are obtained based on the detection signals of the above.

[0007]

By the way, in the above-mentioned lens meter, after the refraction characteristic value is mapped and displayed,
When calculating the refractive characteristic values of the near portion, the progressive portion, and the like, it is also considered that a specific range of the mapping display is manually specified and the average value of the refractive characteristic values in the specified range is calculated.

However, since this designation is determined by the operator, it is not possible to obtain an accurate refraction characteristic value in a specific range of the progressive portion or the near portion. It took time.

SUMMARY OF THE INVENTION An object of the present invention is to provide a lens meter which can determine a range of a predetermined power (allowable power) of a distance portion or a near portion by an area to accurately specify a distance portion or a near portion. Is to do.

[0010]

In order to achieve this object, the invention according to claim 1 is to project a measuring light beam from a measuring light beam projecting optical system onto a lens to be measured and to convert the measuring light beam transmitted through the lens to be measured. A measuring optical system for receiving light by a light receiving means of the light receiving optical system, and a measurement signal from the light receiving means of the light receiving optical system to process coordinates S _{i at} a number of points on the test lens.
A lens meter comprising: processing means for determining a refraction characteristic value; storage means for storing the coordinates and the refraction characteristic value in association with each other; and display means for displaying the refraction characteristic value calculated by the processing means. , the when the test lens is a progressive somewhat point lens, the cylindrical power C ₀ distance portion from the cylindrical power Cx of multiple points of the lens
In addition to obtaining a boundary line at which the cylindrical power obtained by subtracting a predetermined value is equal to or more than a predetermined value and displaying the boundary line on the display means, the cylindrical power of a large number of points of the test lens is equal to or less than a set value and the spherical power of the coordinates is smaller on the side. Approximately the same frequency (allowable frequency)
In addition, a range of a predetermined size or more is obtained as a distance range,
A lens meter for displaying the obtained distance range on the display means.

The lens meter according to the second aspect of the present invention provides
The lens meter according to claim 1, wherein a distance eye point is displayed in the distance range.

According to another aspect of the present invention, there is provided a lens meter for projecting a measurement light beam from a measurement light beam projection optical system onto a lens to be measured and transmitting the measurement light beam through the lens to be measured. A measuring optical system for receiving a light beam by a light receiving unit of a light receiving optical system, and a processing unit for processing a measurement signal from the light receiving unit of the light receiving optical system to obtain coordinates and refraction characteristic values at many points of the lens to be inspected. A lens meter comprising: storage means for storing the coordinates and the refraction characteristic values in association with each other; and display means for displaying the refraction characteristic values calculated by the processing means.
Wherein when the test lens is a progressive somewhat point lens, determine the boundary where the cylinder power minus the cylindrical power C ₀ of the distance portion from the cylindrical power Cx of a number of points of the lens is equal to or greater than a predetermined value In the display means, and the cylindrical power of a large number of points of the lens to be inspected is equal to or less than a set value and substantially the same power (allowable power) in a range where the addition power of the coordinates is large. And a lens meter for displaying the obtained near range on the display means.

The lens meter according to the fourth aspect of the present invention provides
2. The lens meter according to claim 1, wherein a near eye point is displayed in the near range.

According to a fifth aspect of the present invention, there is provided a lens meter according to the second or fourth aspect, wherein the position of the eye point is indicated by a bar.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. [Configuration] In FIG. 1, reference numeral 1 denotes a main body of a lens meter, 2 denotes a display device (display means) such as a CRT or a liquid crystal display provided on the front upper portion (front upper portion) of the main body 1, and 2a denotes a display screen of the display device 2. (Display unit).

On the front of the main body 1, an upper optical component storage section 3 is provided at the center in the vertical direction, and a lower optical component storage section 4 is provided below the upper optical component storage section 3. I have. The upper wall 4a of the lower optical component housing 4 is provided with a lens receiver 5 projecting upward. The lens receiver 5 is cylindrical and formed on a truncated cone. L is one of the test lenses brought into contact with the lens receiver 5. The center of the lens receiver 5 is the measurement optical axis O of the measurement optical system.

A measuring light beam projection optical system for projecting the measuring light beam from the light source toward the lens L to be inspected is provided in the upper optical component housing 3. Further, in the lower optical component storage unit 4, the measurement light flux transmitted through the lens L to be measured is received by a CCD (area sensor or two-dimensional light receiving sensor) 6 shown in FIG.
There is provided a light receiving optical system (not shown) for guiding the light.
The measurement light beam projection optical system and the light receiving optical system constitute a measurement optical system, and a conventionally well-known configuration is used for the measurement optical system, and therefore a detailed description thereof will be omitted.

On the upper wall 4a of the lower optical component housing 4, a plate-like lens table 7 whose front surface extends left and right and up and down (vertically) is disposed. The lens table 7 is elongated in the left and right direction, and is held in front of the main body 1 by guide means (not shown) so as to be adjustable in the front-rear direction. Reference numeral 8 denotes a table operation lever held on the lateral side of the main body 1 so as to be able to rotate back and forth, and the lens table 7 is adjusted (adjusted) to move forward and backward by rotating the table operation lever 8 forward and backward.

The amount of forward and backward movement of the lens table 7 is detected by a sensor (forward and backward moving distance measuring means) 9 shown in FIG. As the sensor 9, a potentiometer, a linear sensor, or the like can be used. In this case, the amount of forward / backward movement of the lens table 7 may be obtained by linearly detecting the forward / backward movement of the lens table 7 using a linear sensor, or the amount of rotation of the table operation lever 8 may be detected by a potentiometer. It may be obtained from the rotation amount.

A slider 10 is held on the upper edge of the lens table 7 so as to be movable left and right, and a nose pad support member 11 is held on the slider 10 so as to be vertically rotatable. The nose pad support member 11 is urged upward by a spring (not shown) and is restricted from turning upward in a horizontal position.

The amount of lateral movement of the nose pad support member 11 is detected by a sensor (lateral movement distance measuring means) 12 shown in FIG. As the sensor 12, a potentiometer, a linear sensor, or the like can be used. in this case,
The amount of lateral movement of the nose pad support member 11 may be obtained by linearly detecting the lateral movement of the slider 10 by a linear sensor or a potentiometer, or may be detected by a rotary encoder.

The measurement signals from the sensors 9 and 12 of the CCD 6 described above are input to an arithmetic control circuit (arithmetic control means) 13 which is a measurement signal processing means. The arithmetic control circuit 13 includes an image processing circuit (image processing means) 14, a frame memory 15, a memory (storage means, recording means) 16,
An information recording / reproducing device (information recording / reproducing means) 17 is connected.

The arithmetic control circuit 13 determines the coordinates of the measurement position based on the measurement signals from the moving distance measuring means 9 and 12 when measuring the refraction characteristics of the lens L to be measured on the measurement optical axis O, The coordinates and the measured refraction characteristics are associated (correlated). [Operation] Next, the operation of the lens meter having such a configuration will be described.

When a power switch (not shown) is turned on to bring the lens L into contact with the lens receiver 5, a measurement light beam is emitted from a light source (not shown) in the upper optical component housing 3 to a measurement optical system (not shown). (Not shown) toward the lens L to be measured. On the other hand, the measurement light beam transmitted through the test lens L is guided to a CCD (light receiving sensor) 6 of FIG. 2 as a light receiving means via a light receiving optical system (not shown) in the lower optical component housing 4. The measurement signal from the CCD 6 is input to the arithmetic and control circuit 13.

The arithmetic control circuit 13 obtains a refraction characteristic value of the lens L to be measured at the measurement optical axis O based on the measurement signal from the CCD 6. The refraction characteristic values include a spherical power S, a cylindrical power C, and a cylindrical axis angle A. (1) Display Associated with Left-Right Movement Operation of Nose Support Member In FIG. 3, a spectacle lens M is provided with a test lens L, which is a spectacle lens. When the nose pad support member 11 is used for the refraction characteristic value of the lens L to be inspected, as shown in FIG.
1 is hit from above. Thereafter, the slider 10 and the nose pad support member are moved until the lens to be measured of the left and right spectacle lenses of the spectacles (glasses) M, for example, the test lens L, which is the left spectacle lens, is positioned above the lens receiver 5. 11 is moved. With this movement, the sensor 12 outputs a measurement signal of the moving distance to the left and right. The origin of this movement distance can be either the center in the left-right direction (the position corresponding to the lens receiver 5) or the left end or the right end of the lens table 7.

The arithmetic and control circuit 13 controls the sensor 12
It is determined whether the slider 10 is on the left or right side of the lens receiver 5 from the measurement signal of (1). In FIG. 3, since the slider 10 is located on the left side of the lens receiver 5, the arithmetic and control circuit 13 determines that the lens L to be inspected is the eyeglass lens on the left side of the eyeglasses M, and as shown in FIG. A typical image 20 of L (image viewed from the front side) of the lens to be inspected on the left side is displayed on the display screen 2a of FIG. At this time, the image 20 includes
Boundary lines 26 and 27 for distinguishing the distance portion 21, the near portion 22, the progressive portion 23 from the distance portion 21 to the near portion, and the distortion regions 24 and 25 are schematically displayed. Moreover, in addition to this, a distance measuring section (mark) 21 'and a near measuring section (mark) 22' of the distance section 21 are displayed, and the center of the lens receiver 5 (measurement) is positioned at the center of the display screen 2a. Optical axis of optical system O)
Is displayed.

The operator operates the operation lever 8 to move the lens table 7 back and forth in accordance with the display of FIG. The lens 21 is moved so that the position substantially corresponding to 21 'matches the cross mark T (so that it is positioned on the measurement optical axis O of the lens receiver 5 (the measurement optical axis of the measurement optical system)).

With this movement, the arithmetic and control circuit 13 operates as shown in FIG.
In addition to measuring the refraction characteristic value of the distance measuring section 21 'on the display screen of FIG.
Seeking coordinates S ₁ in the Y plane (horizontal plane), in correspondence is stored in the memory 16 and refractive properties of the distance measuring section 21 'distance measuring unit 21 the coordinates S1 of'.

At the time of this measurement, whether the lens L to be tested is a single focus lens until the arithmetic control circuit 13 determines whether the lens L to be tested is a single focus lens or a progressive multifocal lens. I do not know if it is a progressive multifocal lens. However, for the sake of convenience of explanation, the description will be made using the terms of the distance measuring unit 21 ′ and the near measuring unit 22 ′ assuming that the lens is a progressive multifocal lens for the sake of convenience of explanation even before the determination by the arithmetic control circuit 13 is performed. ing. This is the same in the following. (2) Operation of moving the lens forward and backward and left and right by the lens table and the nose support member After this, the operator crosses the cross mark (coincides with the optical axis O) T on the distance measuring unit 21 'on the display screen 2a of FIG. The operating lever 8 is rotated back and forth to move the lens table 7 back and forth so that the lens L moves to the near measurement section 22 ', and the slider 10 is moved left and right to move the lens L to be measured.
Is moved back and forth and left and right.

Along with this movement, the arithmetic and control circuit 13 determines the refraction characteristic values from the distance measuring section 21 'to the near measuring section 22' on the display screen 2a of FIG. The power C, the cylinder axis angle A, and the like are measured at predetermined time intervals (every tenths of a second) or at predetermined distances (predetermined intervals), and the measured values are stored in the memory 16. At this time, the operation control circuit 13
Is calculated from the measurement signals (movement amount detection signals) of the sensors 9 and 12 by using the coordinates S _i [i =
1, 2, 3,... N] are stored in the memory 16 in such a manner that the coordinates Si of the measuring section correspond to the refraction characteristics of the measuring section. (i) Display of Refraction Characteristics of Single Focus Lens The arithmetic and control circuit 13 calculates the difference between the spherical power of the distance measuring unit 21 'and the spherical power of the near measuring unit 22' on the display screen 2a of FIG. Ask. At this time, when the arithmetic control circuit 13 determines that the obtained difference is equal to or larger than a predetermined value, for example, smaller than 0.5 D (0.5 diopter), the arithmetic control circuit 13 determines that the lens L to be inspected is a single focus lens, and calculates the refractive characteristic value. A certain spherical power S,
The display screen 2 of the display device 2 displays the cylindrical power C, the cylindrical axis angle A, and the like.
a. (ii) Refraction characteristic measurement mode of the progressive multifocal lens When the arithmetic control circuit 13 determines that the obtained difference is equal to or more than a predetermined value, for example, 0.5 D (0.5 diopter) or more, the test lens L Is a progressive focal point lens, the mode is switched to a mode in which the refraction characteristic value at each coordinate of the test lens L as shown in FIG. 5 is obtained and displayed, and the addition power ADD, the spherical power S, the cylindrical power C, The column axis angle A and the like are displayed on the display screen 2a of the display device 2, for example, at the upper right.

Then, the arithmetic and control circuit 13 displays the mark M1 indicating the distance measuring section 21 'in FIG. 4 in correspondence with the coordinates S1 as shown in FIG.

Further, the arithmetic and control circuit 13 obtains the difference between the cylindrical powers in the respective measuring units Si from the distance measuring unit 21 'to the near measuring unit 22', and calculates the difference between the obtained cylindrical powers on the coordinates S.
In addition to being stored in the memory 16 in association with (corresponding to) i, a bar-shaped (or cylindrical) bar B _i [i
= 1, 2, 3,... N] and the coordinates S _i-1
The bar B _i-1 is displayed as a measurement end mark and cylindrical refractive characteristic values in. Then, a cross mark T is displayed next to the bar _Bi-1 at a portion indicating the next measurement position.

Such a display is performed by the arithmetic and control circuit 13 displaying the mark M1 in the frame memory 14 via the image processing circuit 15.
And the image data of the bar B _i-1 are constructed.

Thereafter, the operator measures the part other than the mark M1 and the bar _Bi-1 displayed on the screen 2a while watching the display on the display screen 2a in FIG. as the measurement position) T of S _i is moved to the mark M1 and bars B _i-1 other than the portions, for example an arrow 30 in FIG. 6, FIG. 7
The cross mark T is moved in the directions indicated by the arrows 31 and 32 in FIG. The movement of the cross mark T
By operating the operation lever 8 to move the lens table 7 back and forth, and by moving the slider 10 left and right, the test lens L of the glasses M is moved back and forth and left and right with respect to the lens receiver 5 and the measurement optical axis O. Can be achieved.

In accordance with this movement, the arithmetic and control circuit 13 operates at predetermined time intervals (predetermined intervals), for example, every few seconds or tens of minutes, or at predetermined distances (predetermined intervals), for example, several minutes. Of the moving position in every 1 mm or several tenths of a millimeter
_i [i = 1, 2, 3,... n] and refraction characteristics are sequentially measured,
Sequentially obtaining the difference between the cylindrical power C ₀ of the cylindrical power C _X and distance measuring section 21 'of the refraction characteristics in the coordinate S _i.

Then, the arithmetic and control circuit 13 stores the obtained difference in the memory 16 in correspondence with the coordinates S _i , and as shown in FIGS. 6 to 9, shows the height of the bar-shaped (or cylindrical) bar B _i . , And the bar B _i-1 [i = 1, 2, 3,... N]
Are sequentially and additionally superimposed on the image 20 of the screen 2a for each measurement.

Therefore, the operator can determine by looking at the screen 2a that the portion where the bar B _i-1 is not displayed is a portion where the refraction characteristic has not yet been measured. The test lens L can be moved so as to move to the measurement optical axis O.

Further, the bar B _i-1 is obtained by obtaining such a bar B _i.
Is performed, the distance portion 21 and the near portion 2 are displayed.
2. Boundary lines 26 and 27 for distinguishing between the progressive portion 23 and the distortion regions 24 and 25 can be sequentially obtained and image-displayed as shown in FIGS. 7, 8 and 9. These boundaries 26 and 27 are
For example, the cylindrical power C _X in the refraction characteristics at the coordinates S _i .
The difference between the cylindrical power C ₀ of the distance measuring unit 21 ′ and the distance measuring unit 21 ′ is obtained by drawing a line at a portion where the difference is 0.25 D or more.
The boundaries 26 and 27 can be clearly indicated by different colors on both sides.

[0039] Incidentally, at the time of the measurement, instead of the cross mark T to display the bar display B _i, with the color of the displayed bar B _i be different from the color to the other bar B _i-1, measuring position Can be displayed as a bar.

In the present embodiment, when the test lens L is moved to the front, rear, left and right with respect to the optical axis O of the lens receiver 5,
The bar B _i-1 displayed on the display screen 2a is not moved.
The cross mark T is moved in conjunction with the forward and backward movement of the lens table 7 and the left and right movement of the slider 10, but is not necessarily limited to this. That is, while the cross mark T is fixedly displayed at the center of the display screen 2a, the lens table 7 and the slider 1 are moved when the lens table 7 is moved back and forth and the slider 10 is moved left and right.
The lens table 7 moves forward and backward and the slider 10 moves so that the bar _Bi-1 displayed on the display screen 2a moves in the same direction as the test lens L in accordance with the movement of the test lens L that moves together with the test lens L. The bar B _i-1 displayed as an image on the display screen 2a may be moved in conjunction with the left-right movement of.

[0041] Thus, since measuring the refractive characteristic value of the lens L in the coordinate S _i using the lens receiver 5, face lens receiver of the lens L is a lens receiving 5 side regardless of the movement position 5 Satisfactorily abuts over the entire upper edge.
As a result, regardless of the movement of the test lens L with respect to the lens receiver 5, the measurement optical axis O of the surface of the test lens L on the lens receiver 5 side.
Since the height is always constant on, even when measuring the refractive characteristics in each coordinate S _i, can measure the refractive characteristics that measurement accuracy in a high state. Therefore, the accuracy of the mapping display by the bar B _i-1 obtained by this measurement is also improved.

As a lens meter for measuring such a mapping display, there is a lens meter which uses a lens array in which a large number of small lenses are arranged vertically and horizontally and simultaneously measures the refraction characteristics of a large number of points of a lens to be measured. is there. However, in addition to the two refraction surfaces of the lens to be measured being curved, a lens array using a lens array uses a parallel light beam to simultaneously measure the refraction characteristics of each part of the lens to be measured. The parallel light flux is obliquely incident on the refraction surface of the lens to be inspected as going toward the periphery of the lens. As a result, in a lens meter using such a lens array, the measurement accuracy of the refraction characteristics decreases as the position approaches the periphery of the lens to be measured.

In this regard, by measuring and displaying the bar as in the above-described embodiment, the measurement accuracy does not decrease regardless of the position from the center to the periphery of the lens to be measured.
Moreover, by performing the measurement and displaying the bar as in the above-described embodiment, the measurement accuracy of the refraction measurement is much improved as it goes toward the periphery of the lens to be inspected, as compared with the lens array.

[0044] Further, by displaying with different colors of bar B _i for each predetermined sphere, it is possible to display a spherical power at the same time. For example, the color of the bar B _i sphere is 0.2
By making the display different every time 5D (0.25D diopter) changes, the cylindrical power and the spherical power can be displayed simultaneously. In this case, the display color to be displayed on the bar B _i is displayed at the position indicated by C _i on the left side in correspondence with the diopter, so that it is possible to grasp which color bar has which frequency.

Further, in the embodiment described above, an example is shown in which mapping is performed on a three-dimensional bar display based on the cylindrical power. However, the present invention is not limited to this. For example, mapping may be performed by displaying a three-dimensional bar using the spherical power or the addition power, and the color of the bar may be changed every time the spherical power of the bar in this mapping changes by 0.25D. In this case, as shown in FIG. 10 may be a bar K ₁ ~K _i indicating the addition power from the distance portion to the near portion so as to linearly arranged and displayed. In FIG. 10, the portion indicated by the two-dot chain line 40 is actually the display screen 2a.
, But are shown for the sake of convenience showing the progressive portion 23, the near portion 22, and the like.

By simultaneously displaying the cylindrical power and the spherical power in such a manner, the cylindrical power and the spherical power in the progressive portion and the near portion are accurately grasped, and the quality of the lens L to be processed is accurately confirmed. Can be. (3) refractive properties displayed also in any position after the measurement, since no decrease measurement accuracy of refractive characteristics in each coordinate S _i as described above, high three-dimensional mapping accuracy described above, and each coordinate S _i Can be measured with the same accuracy regardless of whether it is near the center or the periphery of the lens L to be measured. As a result, after the image of the mapping of the refraction characteristic values as shown in FIG. 9 is finally obtained by the measurement as described above, the pointing means such as the cross mark T or the cursor is displayed on the mapping display image of the display screen 2a. A position moving means for moving the mouse on the main body, a cursor key (position moving means) provided on the main body 1, or a mouse (position moving means) connected to the main body 1 so as to be usable.
By moving the indicating means such as the cross mark T or the cursor on the display screen 2a by the position moving means such as a cursor key or a mouse, the refraction characteristics (ADD, S, C, A) of the position indicated by the indicating means are stored in the memory. 16 and may be displayed accurately. This information may be recorded in the information recording / reproducing device 17 and read out from the information recording / reproducing device 17.

In this way, even if it is desired to know the measurement result of each coordinate after the mapping display by the bar B _i , it is possible to easily and quickly know the refraction characteristic at a necessary place.

In the embodiment described above, an example is shown in which the refraction characteristic (refraction characteristic value) of the progressive multifocal lens is three-dimensionally displayed in a bar graph form with a bar Bi _-1 .
As shown in FIGS. 11 to 14, the refraction characteristic (refraction characteristic value) of the progressive multifocal lens may be displayed three-dimensionally by the wire frame WF. Also in this case, the operation is the same as that of the above-described embodiment using the bar display.
The same or similar portions as in FIG. 9 are denoted by the same reference numerals as in FIGS. 5 to 9, and the description thereof is omitted. In this case, the bar B _i is displayed on the prismatic upper surface of the bar B _i is the image processed by the arithmetic and control circuit 13 so as to be continuous to the upper surface of the adjacent bar. (4) Display of refraction characteristics of distance, progressive, and near portions after measurement The arithmetic and control unit (processing means) 13 reads data of refraction characteristics (cylinder power and addition power) from the memory 16 and reads the data. , performs mapping display of the cylindrical power by bar B _i shown in wireframe WF as shown in FIG. 15, bars K ₁ ~K _i indicating the pressurizing power of up to near portion from the distance portion to the mapping display Are displayed on top of each other. Moreover,
The arithmetic and control circuit 13 generates boundary lines 26 and 27 indicating boundaries between the distortion regions 24 and 25 and portions other than the distortion regions 24 and 25.
Are displayed on top of each other. The boundaries 26 and 27 are obtained as described above. (5) Specification of distance range, near range, eye point, etc. and display thereof In the above-described embodiment, the spectacle lens, which is the lens to be inspected, is moved forward, backward, left, and right on the lens receiver 5 so that the lens receiver 5 Is scanned with respect to the spectacle lens back and forth and left and right to obtain coordinates and optical characteristics (refraction characteristics and the like) at many points of the spectacle lens, but the invention is not necessarily limited to this.

For example, the light from the measurement light source is converted into a parallel light beam through a collimator lens, and the parallel light beam is converted into a large number of measurement light beams using a perforated aperture plate having a large number of small holes or a lens array plate having a large number of lenses. By projecting a large number of measurement light beams onto a spectacle lens on a lens receiver, projecting a large number of measurement light beams transmitted through the spectacle lens onto a CCD (light receiving sensor), and analyzing an output signal from the CCD,
Coordinate and refraction characteristics (S,
C, A, ADD) can be determined correspondingly. In addition, the light from the measurement light source is converted into a parallel light beam through a collimator lens, and the parallel light beam is projected onto a spectacle lens. By projecting onto a CCD (light receiving sensor) through a lens array plate in which lenses are arranged and analyzing output signals from the CCD, coordinates and refraction characteristics (S, C, A, ADD) at many points of the spectacle lens are analyzed. ) Can be determined correspondingly.

Then, the refraction characteristics of the spectacle lens can be mapped and displayed from the refraction characteristic values at a number of points thus obtained. The boundary line 2 is obtained by using the refraction characteristics (S, C, A, ADD) obtained in this manner.
6, 27 can be obtained. That is, the boundary lines 26 and 2
Reference numeral 7 denotes, for example, a cylindrical power _CX of the refraction characteristics at each point of the spectacle lens and a distance measuring unit (the distance measuring unit 2 described above).
(The same position as 1 ') is obtained by drawing a line by obtaining a portion where the difference of the cylindrical power C ₀ is 0.25D or more.

The arithmetic control circuit 13 obtains the distance portion 50, the progressive portion 51, and the near portion 52 from data such as the spherical power S, the cylindrical power C, and the addition power ADD, which are refraction characteristic values.

The distance portion 50 has a distance range 51a and a distance eye point EP1, and the near portion 52 has a near range 52a.
And a near eye point EP2.

Moreover, the arithmetic and control circuit 13 sets the distortion region 2
On the side where the spherical power of coordinates other than 4 and 25 is smaller, a range (a power setting range of the prescription value) having substantially the same power (allowable power) and a width equal to or larger than a predetermined value is obtained. And In the case of an aspherical lens, the distance portion also changes in spherical power.
It is better to find and display 0a. Alternatively, the area of the distance range 50a thus obtained may be obtained as a numerical value and displayed as a numerical value.

The arithmetic and control circuit 13 also controls the distortion region 2
A range in which the change in the addition power between the coordinates other than 4 and 25 is large is determined as the progressive section 51.

Further, the arithmetic and control circuit 13 controls the distortion region 2
In a range on the side where the addition power of the coordinates other than 4 and 25 is large, a range (a power setting range of the near power based on the prescription value) having substantially the same power (a power in a permissible range) and having a width equal to or larger than a predetermined value is obtained. The range is set to 52a. Alternatively, the area of the near range 52a obtained as described above may be obtained as a numerical value and displayed as a numerical value.

Further, the arithmetic and control circuit 13 determines boundary lines 50b and 51 indicating the obtained distance range 50a of the distance portion 50, the range 51b of the progressive portion 51 and the near range 52b of the near portion 52.
By superimposing and displaying b and 52b on the image of the mapping display, the distance portion 50, the progressive portion 51, and the near portion 52 are displayed so as to be distinguishable.

In this manner, the refractive characteristic values of the progressive portion, the near portion, and the like can be accurately obtained. In addition, a specific range of the progressive portion or the near portion can be automatically and accurately specified from the mapping display, and an accurate refraction characteristic value in the specified range can be automatically obtained. Time can be shortened. (i). How to Obtain Eye Point Based on Prism Amount Further, the arithmetic and control circuit 13 obtains a progressive line (usually set at about 10 °) 53 passing through the center of the progressive portion (similar advance zone) 51 in the width direction, and A vertical line (a vertical line, that is, a vertical line when worn) that passes through a point where the amount of prism in the horizontal direction of the distance portion 50 becomes “0” is obtained, and the intersection of the progressive line 53 and the vertical line is distant. Eye point EP1 for
The approximate center of the progressive line 53 in a range where the addition power of the near portion is substantially unchanged is set as the near eye point EP2. As described above, the arithmetic control circuit 13 automatically and accurately obtains and displays the eye points EP1 and EP2 with high accuracy. (ii) How to Obtain Eye Point Based on Approximately Same Refractive Power Width The difference between the cylindrical power C _X and the cylindrical power C ₀ of the distance measuring unit 21 ′ is C _X = C ₀ , or the difference is substantially the same. (Within specified range)
And at a time, the progressive portion 51, the width between the boundary lines 26 and 27 in the near portion 52 side than the predetermined value, and continuously width of the predetermined value or more, the area S _X of the portion of the continuous The value of the addition power of the near portion 52 when the area becomes equal to or _larger than the predetermined area S ₀ is automatically stored as the near eye point EP2. At this time, the near eye point EP2 is positioned on the progressive line 53.

Similarly, the eye point E of the distance portion 50
P1 can be determined. The method of obtaining such an eye point is performed by the arithmetic control circuit 13. Moreover, this method can also be applied to a case where the lens is a bifocal lens with small lenses. (iii). How to find an eye point based on the area of approximately the same spherical power (addition power), the distance portion 50 has the largest width and area, and the progressive portion 51 has a sharply smaller width than the distance portion 50. The width of the progressive portion 51 tends to gradually increase as approaching the near portion 52. Moreover, the addition power of the progressive portion 51 gradually increases as approaching the near portion 52, and the addition portion tends to hardly change in the near portion 52. There is a correlation between such a width and the addition power.

However, as shown in FIGS. 16A to 16G, the progressive spectacle lens actually mounted on the spectacle frame depends on the inclination of the progressive portion 51 and the width of the near portion 52. And the type of eyeglasses, and also the state of the eyeglass lens framed in the eyeglass frame. Therefore, the near eye point EP2 of the spectacle lens framed in the spectacle frame cannot always be accurately obtained only by the inclination of the progressive portion 52.

For example, as shown in FIGS. 16A and 16D, in a spectacle lens of a left and right different design, the progressive portion 51 and the near portion 52 are arranged inward for comfortable binocular vision. I have. With such a spectacle lens, the progressive line 53 having a linear inclination as described above cannot be obtained, and the near eye point can be accurately obtained by the method as described in (i) and (ii) above. Can not.

In the lens meter, the spectacle lens is moved in a direction perpendicular to the measurement optical axis passing through the lens receiver, so that the distance portion, the progressive portion, and the near portion of the spectacle lens pass through the lens receiver. By crossing the measurement optical axis,
As the measurement optical axis scans linearly from the distance portion of the spectacle lens to the near portion through the progressive portion, and measures the addition power from the progressive start point of the spectacle lens toward the near portion, Based on this measurement, as shown in FIG. 17, an additional power curve A0 indicating the relationship between the distance from the progressive start point toward the near portion and the additional power may be graphically displayed on the display screen. I have. In this lens meter, a change from the progressive portion to the near portion can be easily recognized from the display screen. Furthermore, in this lens meter, when measuring the addition power from the progressive start point of the spectacle lens toward the near portion as described above, the near portion is estimated by analogizing the change from the progressive portion to the near portion. It is also considered to be displayed.

However, in such a lens meter, since the change in the addition power on a straight line is obtained, even if the position of the near portion on the straight line can be obtained, the position of the near point can be accurately determined. It could not be sought.

Therefore, the cylindrical power C _X and the distance measuring unit 21 ′
The difference between the cylindrical powers C ₀ is C _X = C ₀ or the difference is substantially the same (within a predetermined range), and as shown in FIG.
The central portion of the area S in the range from the inflection point P1 at which the change in the addition power from 1 toward the near portion 52 sharply decreases to the point P2 of the predetermined power Δd is defined as the near eye point EP2.
The value of the addition power at the center of the area S is automatically stored as the addition power of the near eye point EP2.

Similarly, the eye point E of the distance portion 50
P1 can be determined. The method of obtaining such an eye point is performed by the arithmetic control circuit 13. Moreover, this method can also be applied to a case where the lens is a bifocal lens with small lenses.

The boundary lines L1, L2 of the distance portion 50, the progressive portion 51, and the near portion 52, the distance eye point EP1, and the near eye point EP2 obtained as described above are displayed as shown in FIG. (iV) Other display examples of the near range, the far range and the eye point The boundary lines 26 and 27 obtained as described above are displayed on the display screen 2a of the display device 2 as shown in FIG.

As described above, the operation control circuit 13
Fig. 5 shows a range (allowable setting range of the dioptric power based on the prescription value) having substantially the same frequency (frequency in the allowable range) and a width equal to or larger than a predetermined value on the side where the spherical power of the coordinates other than the distortion regions 24 and 25 is small. The distance range 50a is obtained as shown in FIG.
In addition, the arithmetic and control circuit 13 sets a range (approximately close to a prescription value based on a prescription value) having substantially the same power (allowable power) and a width equal to or larger than a predetermined value in a range on the side where the addition power of the coordinates other than the distortion areas 24 and 25 is large. The allowable setting range of the frequency is obtained as shown in FIG. Then, the obtained far use range 50a and near use range 52a are displayed on the display screen 2a of the display device 2 together with the boundaries 26 and 27 as shown in FIG.

Further, the arithmetic and control circuit 13 obtains an imaginary line V1 passing through the position where the amount of prism in the left-right direction in the distance portion 50 becomes "0", and obtains the approximate width of the progressive portion 51 of the boundary lines 26 and 27. A virtual line V2 passing through the center is determined, an intersection P of the virtual lines V1 and V2 is determined, and a predetermined amount b
A distance circle eye point EP1 is set to a circle having a predetermined diameter centered on a position P1 shifted upward only by the distance P1. Further, the arithmetic and control circuit 13 obtains the center of gravity Ga of the area of the near range 52a, and sets a circle having a predetermined diameter centered on the obtained center of gravity Ga as the near eye point EP2. Then, the obtained distance eye point EP1 and near eye point EP2 are displayed on the display screen 2a of the display device 2 as shown in FIG.
a and the boundary lines 26 and 27 are displayed. a. Other Methods for Obtaining Near Eye Point In the above-described example, the center of gravity G1 of the area of the near area 52a is obtained as the center of the near eye point EP2, but the invention is not necessarily limited to this. For example, as shown in FIG. 24, the intersection of the half of the vertical width W of the near range 52a with the virtual line V2 is obtained as the near eye point EP2, and this near eye point EP2 is obtained as shown in FIG. As described above, the display screen 2a of the display device 2 can be displayed together with the distance eye point EP1, the distance range 50a, the near range 52a, and the boundaries 26 and 27. b. Display method of other distance eye point and near eye point Also, when the above-mentioned intersection between the virtual line V1 and the upper part of the distance range 50a is P2, a line (bar) between the intersections P1 and P2 shown by solid lines. Is a distance eye point range Fa in which the distance eye point EP1 can be set. Further, a line connecting the center of gravity Ga of the area of the near range 52a and the intersection P of the virtual lines V1 and V2 is set as a virtual line V3, and the intersection of the virtual line V3 and the near range 52a is set as P3 and P4. At this time, a line (bar) between the intersection points P3 and P4 indicated by the solid line is set as a near eye point range Na in which the near eye point EP2 can be set. Then, the eye point ranges Pa and Na are displayed on the display screen 2a of the display device 2 as the distance range 50a and the near range 52a.
And the boundary lines 26 and 27 may be displayed. In this case, the position of the eye point can be set flexibly. b. Other Display Method of Near Eye Point In addition, the far eye point EP1 may be displayed as shown in FIG. 21 and the near eye point range Na shown in FIG. 23 may be displayed by another method.

For example, as shown in FIG. 26, small circles which are vertically in contact with the near range 52a on the imaginary line V3 are defined as eye points EP2a and EP2b.
P2a and EP2b are displayed on the display screen 2a of the display device 2 as shown in FIG.
a, the near range 52a and the boundary lines 26 and 27 may be displayed. (V) Others Further, the arithmetic control circuit 13 may determine the inclination angle and coordinates of the progressive line 53 and the width and length of the progressive portion 51 so that the arithmetic control circuit 13 determines the lens type. it can. In this case, examples of the type of lens include other types such as a reading type having a wide near vision range, an outdoor type having a clear far vision, and an indoor type dedicated to near use. .

The processing for displaying the refraction characteristics of the distance portion, the progressive portion, and the near portion is performed by mapping the refraction characteristic values obtained by using a perforated aperture plate or a lens array or displaying refraction characteristic values. Although the measurement data can be used, the accuracy can be greatly improved by using the refraction characteristic value obtained while moving the test lens as in the above-described embodiment.

Further, in the bar display of the refraction characteristic as described above, the extending direction may be reversed when the spherical power S is-and +, or when the spherical power S is-and +. An image can be displayed so as to extend in the same direction as the absolute value display.

[0071]

Since the lens meter according to the present invention is configured as described above, the range of the predetermined power (allowable power) of the distance portion and the near portion is determined by the area. The part can be specified accurately.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view of a lens meter according to the present invention.

FIG. 2 shows a control circuit of the lens meter shown in FIG.

FIG. 3 is an enlarged view of a main part showing a use state of the lens meter of FIG. 1;

FIG. 4 is an explanatory diagram showing an example of a screen display before the measurement of the lens meter of FIG. 1 is started.

FIG. 5 is an explanatory diagram showing a display example of a display screen when a refraction characteristic is measured by the lens meter of FIGS. 1 to 3;

FIG. 6 is an explanatory diagram showing a change in the display screen of FIG. 5;

FIG. 7 is an explanatory diagram showing a change of the display screen of FIG. 6;

FIG. 8 is an explanatory diagram showing a change in the display screen of FIG. 7;

FIG. 9 is an explanatory diagram showing a change in the display screen of FIG. 8;

FIG. 10 is an explanatory diagram showing another display example of the display screen at the time of measuring the refraction characteristic by the lens meter of FIGS.

FIG. 11 is an explanatory diagram showing still another display example of a display screen at the time of measuring a refraction characteristic by the lens meter of FIGS. 1 to 3;

FIG. 12 is an explanatory diagram showing a change in the display screen of FIG. 11;

FIG. 13 is an explanatory diagram showing a change of the display screen of FIG.

FIG. 14 is an explanatory diagram showing changes in the display screen of FIG.

FIG. 15 is an explanatory diagram in which an additional power is superimposed on the display screen of FIG. 14 and a distance portion, a progressive portion, and a near portion are obtained and displayed.

FIGS. 16A to 16G are explanatory diagrams showing patterns of a progressive portion and a distance portion of a progressive lens.

FIG. 17 is an addition power change curve diagram showing a change in the addition power of the progressive portion of the progressive lens.

FIG. 18 is an explanatory diagram for specifying an eye point of a progressive lens.

FIG. 19 is an explanatory diagram showing an example of an image display based on the measurement result of the progressive lens shown in FIG. 18;

FIG. 20 is an explanatory diagram of how to determine a distance range, a near range, and an eye point of the lens to be inspected according to the present invention.

FIG. 21 is an explanatory diagram showing a display example of a distance range, a near range, and an eye point obtained using FIG. 20;

FIG. 22 is an explanatory diagram of how to determine a distance range, a near range, and an eye point of a lens to be inspected according to the present invention.

FIG. 23 is an explanatory diagram showing a display example of a distance range, a near range, and an eye point obtained using FIG. 22;

FIG. 24 is an explanatory diagram of how to determine a distance range, a near range, and an eye point of a lens to be inspected according to the present invention.

FIG. 25 is an explanatory diagram showing a display example of a distance range, a near range, and an eye point obtained using FIG. 24;

FIG. 26 is an explanatory diagram of how to determine a distance range, a near range, and an eye point of a lens to be inspected according to the present invention.

FIG. 27 is an explanatory diagram showing a display example of a distance range, a near range, and an eye point obtained using FIG. 26;

[Explanation of symbols]

2 ... display device (display means) 6 ... CCD (light receiving sensor, light receiving means) 13 ... arithmetic control circuit (arithmetic processing means) 16 ... memory (storage means, recording means) 26, 27 · border 50a · · · distance range 52a · · · near range B _i · · · bar (end of measurement marks) L · · · target lens O · · · measurement optical axis S _i · · · coordinates

Claims (5)

[Claims] 1. A measuring optical system which projects a measuring light beam from a measuring light beam projecting optical system onto a test lens and receives a measuring light beam transmitted through the test lens by a light receiving means of a light receiving optical system; and the light receiving optical system. Processing means for processing the measurement signals from the light receiving means to obtain coordinates S _i and refraction characteristic values at a number of points of the lens to be inspected; storage means for storing the coordinates and refraction characteristic values in association with each other; In a lens meter including a display unit for displaying a refraction characteristic value calculated by a processing unit, the processing unit includes a cylindrical power of a number of points of the test lens when the test lens is a progressive or somewhat point lens. Cx
A boundary line where the cylindrical power obtained by subtracting the cylindrical power C ₀ of the distance portion from the target lens is equal to or greater than a predetermined value is obtained and displayed on the display means, and the cylindrical power of a large number of points of the lens to be inspected is equal to or less than a set value and Determining a range having a substantially equal frequency (a frequency within an allowable range) and a width equal to or greater than a predetermined value on a side where the spherical power of the coordinates is smaller, and displaying the obtained distance range on the display means as a distance range; Characteristic lens meter. 2. The lens meter according to claim 1, wherein
A distance meter, wherein a distance eye point is displayed in the distance range. 3. A measuring optical system that projects a measuring light beam from a measuring light beam projecting optical system onto a test lens and receives a measuring light beam transmitted through the test lens by light receiving means of a light receiving optical system; and the light receiving optical system. Processing means for processing the measurement signal from the light receiving means to obtain coordinates and refraction characteristic values at a number of points of the lens to be inspected; storage means for storing the coordinates and refraction characteristic values in association with each other; A lens meter having a display means for displaying the refraction characteristic value calculated according to the following. The processing means, when the test lens is a progressive or somewhat point lens, the cylindrical power Cx of many points of the test lens
A boundary line where the cylindrical power obtained by subtracting the cylindrical power C ₀ of the far vision portion from the predetermined distance is equal to or more than a predetermined value is obtained and displayed on the display means, and the cylindrical power of a large number of points of the test lens is equal to or less than a set value and A range having substantially the same power (allowable power) and a width equal to or greater than a predetermined value in a range on the side where the addition power of the coordinates is large is determined as a near range, and the determined near range is displayed on the display means. A lens meter characterized by: 4. The lens meter according to claim 1, wherein
A lens meter, wherein a near eye point is displayed within the near range. 5. The lens meter according to claim 2, wherein the position of the eye point is indicated by a bar.