JP2002022605A - Method for measuring refraction characteristics of lens and lens meter therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for measuring the refraction characteristics of a lens, and a lens meter therefore, in which a position under actual measurement or a position where measurement has ended can be known easily when the refraction characteristics of a lens are measured at a large number of positions without using any dedicated machine. SOLUTION: When a lens L being inspected is moved in a direction substantially orthogonal to a measuring optical axis O, coordinate Si of the measuring position of the lens L being inspected by a measuring light beam is determined by an operation control circuit 13 processing means every predetermined time or at a predetermined interval and a refraction characteristics value is determined at the coordinate Si of the lens L being inspected by the operation control circuit 13. Bars Bi indicative of the refraction characteristics are displayed sequentially and additionally at the coordinate Si of positions where measurement has ended on the screen 2a of a display 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for measuring a lens refraction characteristic for displaying an image of a refraction characteristic of a test lens and a lens meter therefor.

[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).

[0004]

However, this lens meter detects a refraction characteristic at a number of points simultaneously by using a perforated aperture plate in which a number of small holes are arranged or a lens array plate in which a number of lenses are arranged. In addition, since it is a dedicated machine for calculating refraction characteristics at a number of points from a detection signal by calculation, it has to be purchased separately from a conventional lens meter, and the cost is high.

Accordingly, in a lens meter of a generally used type, the distance between the distance portion or the boundary between the progressive portion and the distortion region of the progressive multifocal lens is determined, and the accurate value of the addition power in the progressive portion is determined over the entire range. It is desirable to be able to know exactly visually. Even in this case, it is desirable that the position where the measurement is actually performed and the position where the measurement is completed can be easily known.

Accordingly, a first object of the present invention is to easily know the actual measurement position and the position where measurement has been completed when measuring the refraction characteristics at many points of a lens without using a dedicated device. It is an object of the present invention to provide a lens refraction characteristic measuring method and a lens meter therefor.

A second object of the present invention is to obtain a boundary between a distance portion or a progressive portion of a progressive power multifocal lens and a distortion region without using a special-purpose device, and to accurately determine an addition power in the progressive portion. It is an object of the present invention to provide a method for measuring the refractive index of a lens and a lens meter therefor, which can easily and accurately determine the appropriate values visually throughout the entire area.

[0008]

In order to achieve the first object, a method for measuring a lens refractive characteristic according to the first aspect of the present invention comprises:
The measurement light beam is projected from the measurement light beam projection optical system to the test lens, and the measurement light beam transmitted through the test lens is received by the light receiving means, and the test lens on the measurement light axis of the measurement light beam projection optical system is measured. In a lens refraction characteristic measuring method of obtaining a refraction characteristic value of the lens by a processing unit based on a measurement signal from the light receiving unit, and displaying the refraction characteristic value on a display unit, the lens to be measured is substantially moved with respect to the measurement optical axis The processing means obtains the coordinates of the measurement position of the test lens by the measurement light beam when moved in the orthogonal direction at predetermined time intervals or at predetermined intervals by the processing means, and the refraction characteristic value at the coordinates of the test lens. Is obtained by the processing means, and a measurement end mark is sequentially and additionally displayed at the coordinate portion of the position where the measurement is completed.

According to a second aspect of the present invention, there is provided a lens refractive characteristic measuring method according to the first aspect, wherein the measurement end mark is a bar graph-shaped bar or a wire indicating a refractive power. It is a frame.

Further, in order to achieve the first object described above, a lens meter according to a third aspect of the present invention has a measurement light beam projection optical system and a light receiving optical system, and measures the measurement light beam from the measurement light beam projection optical system. A measuring optical system that projects the light beam onto the test lens mounted on the lens receiver and receives the measuring light beam transmitted through the test lens by the light receiving unit of the light receiving optical system;
Processing means for processing a measurement signal from a light receiving means of the light receiving optical system to calculate a refractive characteristic value of the lens to be measured on a measurement optical axis of the measurement light beam projection optical system; and a display for displaying the refractive characteristic value In the lens meter provided with means, when the processing means moves the test lens in a direction substantially orthogonal to the measurement optical axis, the measurement position of the test lens with respect to the measurement optical axis of the measurement optical system Are obtained at predetermined time intervals or at predetermined intervals, the refraction characteristic value at the coordinates of the test lens is obtained, and a measurement end mark is sequentially and additionally displayed on the coordinate portion of the position where the measurement is completed. Is set to.

According to a fourth aspect of the present invention, there is provided a lens meter according to the third aspect, wherein the measurement end mark is a bar graph-shaped bar or a wire frame for displaying a refractive power. Features.

A lens meter according to a fifth aspect of the present invention is the lens meter according to the third or fourth aspect, wherein the lens table further extends left and right and can be operated to move back and forth, and detects a longitudinal movement position of the lens table. Front and rear position detecting means for outputting a front and rear position detection signal, and a nose pad supporting member which is capable of supporting a nose pad of eyeglasses provided with the spectacle lens as the lens to be inspected and which is movable to the left and right on the lens table. And a lateral movement position detecting means for detecting a lateral movement position of the nose pad support member and outputting a left / right position detection signal, wherein the processing means causes the nose pad of the glasses to be supported by the nose pad support member. When the edge of the glasses is brought into contact with the lens table, the coordinates of the measurement position of the glasses lens of the glasses are determined from the front-back position detection signal and the left-right position detection signal. It has been set.

According to a sixth aspect of the present invention, there is provided a lens meter according to any one of the third to fifth aspects, wherein the processing means is at least an upper position serving as a distance portion of the spectacle lens when the spectacles are worn. And the refraction characteristic at the lower position serving as the near portion is measured, and the difference between the spherical refraction powers of the distance portion and the near portion among the refraction characteristics is obtained. After determining that the lens is a focal lens and switching to a mode for obtaining a refraction characteristic value at the coordinates of the test lens, of the refraction characteristics of the cylindrical power of each measurement position and the cylindrical power of the distance portion A difference is obtained, and a boundary line between the distance portion and the distortion area is obtained from a position where the obtained difference becomes a set value, and the image is sequentially displayed on the display means.

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a main body of a lens meter, and 2 denotes a C provided at an upper front portion (upper front portion) of the main body 1.
A display device (display means) such as an RT or a liquid crystal display;
2a is a display screen (display unit) of the display device 2.

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 lenses to be tested brought into contact with the lens receiving table 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. An image processing circuit (image processing means) 14, a frame memory 15, a memory 16, and an information recording / reproducing device 17 are connected to the arithmetic control circuit 13.

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).

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. <Display associated with left-right movement operation of nose pad support member>
In FIG. 3, a test lens L, which is a spectacle lens, is attached to the spectacles M. When the nose pad support member 11 is used for the refraction characteristic value of the lens L to be inspected, the nose pad 17 of the glasses M is applied to the nose pad support member 11 from above as shown in FIG. 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 moving distance is the center in the horizontal direction (the position corresponding to the lens receiver 5) or the lens table 7
Can be taken on either the left or right end. (Display of a schematic image of the spectacle lens of the spectacles) Then, the arithmetic and control circuit 13 determines whether the slider 10 is on the left or right of the lens receiver 5 from the measurement signal of the sensor 12.
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 a distance portion 21 and a near portion 22.
In addition, boundary lines 26 and 27 for distinguishing 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, the distance measuring section (mark) 21 'and the near measuring section (mark) 22' of the distance section 21 are added.
Is displayed, and the lens receiver 5 is placed at the center of the display screen 2a.
(The optical axis O of the measuring optical system) 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. 7, the X-rays of the distance measuring section 21 ′ on the screen display are obtained from the measurement signals (movement amount detection signals) of the sensors 9 and 12.
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 until the judgment by the arithmetic and control circuit 13. ing. This is the same in the following. <Learning / Left / Right / Right Movement Operation of Lens Using Lens Table and Nose Support Member> Thereafter, the operator moves the display screen 2 shown in FIG.
5A, the operating lever 8 is rotated back and forth so that the cross mark (coincident with the optical axis O) T in the distance measuring section 21 'moves to the near measuring section 22'. At the same time, the slider 10 is moved left and right to move the test lens L 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. (Display of Refraction Characteristics of Single Focus Lens) Then, the arithmetic and control circuit 13 sets the distance measuring unit 21 'on the display screen 2a of FIG.
Is obtained from the spherical power of the near measuring unit 22 '. 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, cylindrical power C, cylindrical axis angle A, and the like are displayed on the display screen 2a of the display device 2. (Refractive characteristic measurement mode of the progressive multifocal lens) The arithmetic control circuit 13 determines that the obtained difference is equal to or larger than a predetermined value, for example, 0.5.
D (0.5 diopter) or more,
Assuming that the test lens L is a progressive or somewhat point-focus lens, the mode is switched to a mode in which the refraction characteristic value at each coordinate of the test lens L is obtained and displayed as shown in FIG. 5, and the addition power ADD, the spherical power S, The column 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 of the cylindrical power and the distance measuring section 21 'of the refraction characteristics in the coordinate S _i. Then, the arithmetic control circuit 13, the difference obtained in response to the coordinate S _i memory 1
Together is stored in the 6, it is converted into the height of the bar B _i of the rod-like (or cylindrical), as shown in FIGS. 6-9, the bar B _i-1
[i = 1,2,3,... n] for each measurement
0 is sequentially superimposed and displayed.

Accordingly, the operator can determine by looking at the screen 2a that the refraction characteristic of the portion where the bar B _i-1 is not displayed is the portion where the measurement is not yet performed. 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, it obtained by drawing a line seeking moiety difference between the cylindrical power of the cylindrical power and the distance measuring section 21 'of the refraction characteristics in the coordinate S _i is greater than or equal to the 0.25 D. The boundaries 26 and 27 can be clearly indicated by different colors on both sides.

[0038] 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 back and forth and right and left 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.

[0040] 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.

[0043] 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 (0.25 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 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, but 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. <Refractive properties of an arbitrary position after the measurement display> In the above since the measurement accuracy of the refraction characteristics in each coordinate S _i as described does not decrease, high three-dimensional mapping accuracy mentioned above,
And the refractive characteristic at each coordinate S _i can also be measured with the same precision, whether close to or peripheral near the center of the lens L. As a result, after the image as shown in FIG. 9 is finally obtained by the above-described measurement, the position moving means for moving the pointing means such as the cross mark T or the cursor on the display screen 2a, the cursor key Whether the (position moving means) is provided on the main body 1 or a mouse (position moving means) is connected to the main body 1 so that it can be used, the cross mark T or the cursor or the like is moved by the position moving means such as a cursor key or a mouse. Is moved on the display screen 2a, the refraction characteristics (ADD,
S, C, A) may be displayed accurately.

[0046] In this case, after the mapping display by bar B _i, even if you want to know the results of measurement of each coordinate, it is possible to know the refractive properties of the required location easily and quickly.

In the embodiment described above, an example is shown in which the refraction characteristic (refraction characteristic value) of the progressive multifocal lens is displayed three-dimensionally in a bar graph 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.

[0048]

As described above, according to the lens refraction characteristic measuring method of the present invention, the measuring light beam is projected from the measuring light beam projection optical system onto the lens to be measured, and the measuring light beam transmitted through the lens to be measured. Is received by the light receiving means, the refraction characteristic value of the test lens on the measurement optical axis of the measurement light beam projection optical system is obtained by the processing means based on the measurement signal from the light reception means, and the refraction characteristic value is displayed. In the method for measuring the lens refraction characteristic displayed on the means, the coordinates of the measurement position of the test lens by the measurement light beam when the test lens is moved in a direction substantially orthogonal to the measurement optical axis are processed by the processing means. And at each predetermined time or at predetermined intervals, and the refraction characteristic value at the coordinates of the lens to be measured is obtained by the processing means, and the coordinates at the position where the measurement is completed are calculated. Since the fixed end mark is sequentially displayed as an image, when measuring the refraction characteristics of many parts of the lens without using a dedicated machine, the position where the measurement is actually performed and the position where the measurement is completed can be easily performed. You can know.

According to a second aspect of the present invention, in the method for measuring the refractive index of a lens according to the first aspect, the measurement end mark is a bar-shaped bar or a wire frame for displaying a refractive power. Without using a machine
By obtaining the boundary between the distance portion or the progressive portion of the progressive multifocal lens and the distortion region, the accurate value of the addition power in the progressive portion can be accurately and visually easily known over the entire region.

Further, the lens meter according to the third aspect of the present invention provides:
A measurement light beam projection optical system and a light receiving optical system, and a measurement light beam from the measurement light beam projection optical system is projected on a test lens mounted on the lens receiver, and a measurement transmitted through the test lens. A measuring optical system for receiving a light beam by a light receiving means of the light receiving optical system; and a refraction of the lens to be measured on a measuring optical axis of the measuring light beam projection optical system by processing a measurement signal from the light receiving means of the light receiving optical system. In a lens meter including a processing unit for calculating a characteristic value and a display unit for displaying the refraction characteristic value, the processing unit moves the test lens in a direction substantially orthogonal to the measurement optical axis. The coordinates of the measurement position of the test lens with respect to the measurement optical axis of the measurement optical system are obtained at predetermined time intervals or at predetermined intervals, and the refraction characteristic value at the coordinates of the test lens is obtained. In order to measure the refraction characteristics of many parts of the lens without using a special device, the measurement end mark is set so that the image is displayed sequentially and additionally at the coordinate part of the completed position. The position where the measurement is being performed and the position where the measurement is completed can be easily known.

Further, the lens meter according to the fourth aspect of the present invention
4. The distance end portion or the progressive portion of the progressive multifocal lens and the distortion region according to claim 3, wherein the measurement end mark is a bar graph-shaped bar or a wire frame for displaying a refractive power, without using a dedicated machine. , The accurate value of the addition power in the progressive portion can be accurately and visually easily known over the entire area.

A lens meter according to a fifth aspect of the present invention is the lens meter according to the third or fourth aspect, wherein the lens table further extends left and right and is operable to move back and forth, and detects a forward and backward movement position of the lens table. Front and rear position detecting means for outputting a front and rear position detection signal, and a nose pad supporting member which is capable of supporting a nose pad of eyeglasses provided with the spectacle lens as the lens to be inspected and which is movable to the left and right on the lens table. And a lateral movement position detecting means for detecting a lateral movement position of the nose pad support member and outputting a left / right position detection signal, wherein the processing means causes the nose pad of the glasses to be supported by the nose pad support member. When the edge of the glasses is brought into contact with the lens table, the coordinates of the measurement position of the glasses lens of the glasses are determined from the front-back position detection signal and the left-right position detection signal. Since the configuration is set, it is possible to accurately detect the measured coordinates of the refraction properties of the spectacle lens.

According to a sixth aspect of the present invention, there is provided a lens meter according to any one of the third to fifth aspects, wherein the processing means is at least an upper position which becomes a distance portion of the spectacle lens when the spectacles are worn. And the refraction characteristic at the lower position serving as the near portion is measured, and the difference between the spherical refraction powers of the distance portion and the near portion among the refraction characteristics is obtained. After determining that the lens is a focal lens and switching to a mode for obtaining a refraction characteristic value at the coordinates of the test lens, of the refraction characteristics of the cylindrical power of each measurement position and the cylindrical power of the distance portion Since the difference is determined, the boundary between the distance portion and the distortion region is determined from the position where the determined difference is a set value, and the image is sequentially displayed on the display means. Distance, progressive, near, and distortion of lens It can be automatically switched to a mode for determining the boundary between the regions. In addition, it is possible to measure and display the refraction characteristics of the distance portion, the progressive portion, and the near portion of the progressive multifocal lens by mapping.

[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.

[Description of Signs] 6 ... CCD (light receiving sensor, light receiving means) 7 ... lens table 11 ... nose pad support member 13 ... arithmetic control circuit (arithmetic processing means) 21 ... distance section 23 ... progressive portion 22 ... near portion 24, 25 ... strained region 26, 27 ... boundary line B _i ... bar (end of measurement marks) L ... subject lens O · · and measuring the optical axis S _i ··· coordinate

Claims (6)

[Claims] 1. A measuring light beam projecting optical system projects a measuring light beam onto a test lens, and a measuring light beam transmitted through the test lens is received by a light receiving means. A lens refraction characteristic measuring method for obtaining a refraction characteristic value of the test lens by a processing unit based on a measurement signal from the light receiving unit and displaying the refraction characteristic value on a display unit. The processing means obtains the coordinates of the measurement position of the test lens by the measurement light beam when moved in a direction substantially perpendicular to the axis at predetermined time intervals or at predetermined intervals by the processing means. A lens characterized in that a refraction characteristic value in coordinates is obtained by the processing means, and a measurement end mark is sequentially and additionally displayed as an image in a coordinate portion of a position where measurement has been completed. Refraction characteristics measurement method. 2. The method according to claim 1, wherein the measurement completion mark is a bar-shaped bar or a wire frame for displaying a refractive power. 3. The apparatus according to claim 1, further comprising a measuring light beam projecting optical system and a light receiving optical system, wherein the measuring light beam from the measuring light beam projecting optical system is projected onto a lens to be inspected mounted on the lens receiver, and the test object A measuring optical system for receiving the measuring light beam transmitted through the lens by the light receiving means of the light receiving optical system, and processing a measurement signal from the light receiving means of the light receiving optical system to process the measurement light beam on the measuring optical axis of the measuring light beam projecting optical system. In a lens meter including a processing unit for calculating a refractive characteristic value of a test lens and a display unit for displaying the refractive characteristic value, the processing unit is configured to set the test lens in a direction substantially orthogonal to the measurement optical axis. When the lens is moved to, the coordinates of the measurement position of the test lens with respect to the measurement optical axis of the measurement optical system are obtained at predetermined time intervals or at predetermined intervals, and the refraction characteristic value at the coordinates of the test lens is obtained. In addition, the lens meter is characterized in that a measurement end mark is sequentially and additionally displayed on the coordinate portion at the position where the measurement is completed. 4. The lens meter according to claim 3, wherein the measurement end mark is a bar-shaped bar or a wire frame for displaying a refractive power. 5. The lens meter according to claim 3, wherein
The lens table further extends left and right and can be moved back and forth, front and rear position detection means for detecting a front and rear movement position of the lens table and outputting a front and rear position detection signal, and a spectacle lens as the lens to be inspected. A nose support member capable of supporting the nose support of the provided glasses and being movable to the left and right on the lens table; and a left and right for detecting a lateral movement position of the nose support member and outputting a left / right position detection signal. A moving position detecting unit, wherein the processing unit is configured to support the nose pad of the glasses on the nose pad support member and to bring the edge of the glasses into contact with the lens table. A lens meter set so that coordinates of a measurement position are obtained from the front-back position detection signal and the left-right position detection signal. 6. A lens meter according to claim 3, wherein said processing means comprises at least an upper position serving as a distance portion and a lower position serving as a near portion of a spectacle lens when the spectacles are worn. Is measured, the difference between the spherical refractive power of the distance portion and the near portion of the refractive characteristics of the refractive characteristics is determined, if this difference is greater than or equal to a set value, it is determined that the progressive multifocal lens After switching to a mode for obtaining a refractive characteristic value at the coordinates of the test lens, the difference between the cylindrical power of each of the measurement positions and the cylindrical power of the distance portion of the refractive characteristics is obtained. Wherein a setting is made such that a boundary between the distance portion and the distortion region is determined from a position at which a set value is obtained and images are sequentially displayed on a display means.