JPH11211616A - Lens-specifying device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and rapidly discriminate whether a lens is a spherical one or an aspherical one according to the distribution of the value of the degree of a spherical surface on a lens to be inspected that is measured by a lens- measuring means. SOLUTION: Luminous flux from a light source 21 is projected to a lens 30 to be inspected on a lens pad 13 via a pin hole 22a of a pin hole plate 22, a mirror 25, and a collimate lens 26. The luminous flux through the lens 30 is projected to a screen 32 through the small hole of a pattern plate 28. The pattern of the small hole bring projected is projected on an area CCD 35 of a CCD camera 36 via a mirror 33 and an image-forming lens 34. By performing a mapping processing by a processing circuit 37 as a lens-judging means based on output from the CCD 35, the spherical degree distribution, the cylindrical degree distribution, and the like of the lens 30 to be inspected can be mapped. Also, the processing circuit 37 as the lens-judging means is set so that the lens to be inspected is either a spherical or aspherical one according to the spherical degree distribution and display is made in characters on a screen 3a of a monitor 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens specifying device for determining whether a lens to be inspected is a spherical lens or an aspherical lens.

[0002]

2. Description of the Related Art In recent years, progressive multifocal lenses and distant aspheric lenses have become widespread as spectacle lenses. It is very difficult to visually distinguish such a lens from a spherical lens.

[0003]

However, in a conventional apparatus such as a lens meter, although the refraction characteristics of a lens can be measured and displayed, it is easy to determine whether the lens to be inspected is a spherical lens or an aspherical lens. I couldn't do that.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a lens specifying device that can easily and quickly determine whether a test lens is a spherical lens or an aspherical lens.

[0005]

In order to achieve this object, the invention of claim 1 comprises a lens measuring means for measuring distribution information of an optical characteristic of a lens to be inspected, and the lens measuring means for measuring distribution information of the lens. The present invention is characterized in that the lens identification device includes a lens determination unit that determines whether the test lens is a spherical lens or an aspherical lens based on a distribution of a spherical power value on the test lens.

According to a second aspect of the present invention, there is provided a lens measuring means for measuring distribution information of an optical characteristic of a lens to be inspected, and the value of the spherical power and the value of the prism of the lens to be inspected measured by the lens measuring means. The present invention is characterized in that the lens identification device has a lens determination unit that determines whether the test lens is a spherical lens or an aspherical lens.

According to a third aspect of the present invention, the lens determining means determines the degree of the aspherical surface from the optical center of the lens to be measured and displays the degree on the display means.

According to a fourth aspect of the present invention, the lens determination means determines whether the test lens is an aspheric progressive lens or an aspheric single focus lens by using at least two spherical powers of the test lens. Is set so as to be displayed on the display means by judging from the difference between the values of

A fifth aspect of the present invention is characterized in that the measurement of the optical characteristics is performed at a plurality of points at different times.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a lens specifying device according to the present invention will be described below with reference to the drawings.

In FIG. 1, 1 is a lens meter, 2 is a main body of the lens meter 1, 3 is a monitor such as a CRT or a liquid crystal display provided on the upper part of the main body 2, and 3a is a display screen (display section) of the monitor 3. Reference numeral 4 denotes an upper optical component storage portion provided on the front side of the main body 2, 5 denotes a lower optical component storage portion provided below the upper optical component storage portion, and 6 denotes an upper end of the lower optical component storage portion 5. The provided lens receiving table 7 is located between the storage sections 5 and 6 and is held in front of the main body 2 so as to be adjustable in the front-rear direction.
A lever for operating a lens contact which is held on the side of the lens so as to be able to rotate back and forth.
Is adjusted to move back and forth.

A slider 9 is provided on the upper edge of the lens pad 7.
The nose pad support member 9 is held on the slider 9a so as to be vertically rotatable. The nose pad support member 9 is urged upward by a spring (not shown) and is restricted from turning upward in a horizontal position. When the refraction characteristic value of the lens SL (31) of the glasses M is measured using the nose pad support member 9, as shown in FIG. The test lens SL (31) is brought into contact with a lens receiver 13 to be described later while rotating the nose support member 9 downward and moving the nose support member 9 left and right by contacting the support 9 from above.
Reference numeral 10 denotes a menu button (switch) for switching modes and the like.

The lens receiving table 6 has a stepped mounting hole 12 shown in FIG. The mounting hole 12 is provided with a lens receiver 13.

A circular unprocessed lens (fabric lens), a processed lens, or a spectacle lens framed in a spectacle frame is set in the lens receiver 13.

A measuring optical system 20 shown in FIG. 3 is provided in the main body 2 as lens measuring means. Measurement optical system 20
Has a light source section (illumination optical system) 20a and a light receiving section (light receiving optical system) 20b.

The light source unit 20 includes a light source 2 for generating a measurement light beam.
1, a pinhole plate 22, a mirror 25, and a collimating lens 26 in this order. In FIG. 3, reference numeral 27 denotes a condensing concave mirror. The light source 21 is composed of a halogen lamp that emits light of a wavelength from ultraviolet to infrared, and the light source 23 is an LE.
D.

The light receiving section 20b is provided on the pattern plate 2
8, an area CCD 35 for a screen 32, a mirror 33, an imaging lens 34 and a CCD camera 36.

The lens receiving table 6 has a lens receiving 13
Is set. The lens receiver 13 includes a pattern plate 28 in which about 1000 small holes are formed and lens receiving pins 29.

Therefore, the light beam from the light source 21 passes through the pinhole 22 a of the pinhole plate 22, the mirror 25, and the collimating lens 26, and the lens 30 to be inspected
Projected to The luminous flux transmitted through the test lens 30 is
The small holes of the pattern plate 28 are projected on the screen 32.
At this time, the luminous flux transmitted through a number of small holes (not shown) of the pattern plate 28 is projected on the screen 3 with an interval changed according to the refractive power of the lens 30 to be measured.

The pattern of the small holes projected on the screen 32 is transmitted through a mirror 33 and an image forming lens 34 to a CCD.
An image is formed on the area CCD 35 of the camera 36. By performing a mapping process in a processing circuit (arithmetic processing circuit) 37 as a lens determination unit based on the output from the area CCD 35, mapping of the spherical power distribution, the cylindrical power distribution, and the like of the test lens 30 can be performed. . This mapping can be displayed on the monitor 3. Since a well-known technique is employed for the configuration of this mapping, a detailed description thereof will be omitted.

Further, a processing circuit 3 as lens determination means
7 is the distribution of the value of the spherical power on the front lens,
The setting is made so as to determine whether the test lens is a spherical lens or an aspherical lens. In this case, the result of the determination as to whether the lens is a spherical lens or an aspherical lens is displayed in the lowermost part of the screen 3a of the monitor 3, such as "spherical lens" or "aspherical lens". In this case, whether the test lens is a spherical lens or an aspherical lens can be easily known.

In the embodiment described above, the pattern plate 28
Although the measurement of whether the test lens is a spherical lens or an aspherical lens is performed by using a lens meter capable of mapping a power distribution according to the above, the present invention is not necessarily limited to this. For example, a normal lens meter without the pattern plate 28 may be used to measure whether the test lens is a spherical lens or an aspherical lens.

That is, one of the left and right lenses (test lenses) of the glasses is disposed on a lens receiver of an existing lens meter, and this lens is simply moved back and forth, for example, every 0.1 seconds (predetermined). By measuring the prism value of the lens at every time), the measurement of the prism value of the lens is measured at a plurality of points at different times, and the processing circuit 37 built in the lens meter is obtained from the prism values at the plurality of points. The (arithmetic control circuit) may determine whether the lens under test is a spherical lens or an aspherical lens. In this case, whether the left and right lenses (test lenses) of the glasses are progressive lenses or single lenses, and if they are single lenses, whether the lenses are spherical or aspherical lenses, etc. This can be easily performed simply by setting a program without changing the basic configuration of the lens meter.

As described above, when the processing circuit 37 determines whether the lens to be inspected is a spherical lens or an aspherical lens based on the value of the spherical power on the lens to be inspected and the value of the prism, at least, The spherical power and the prism value at three or more points such as the center, the middle, and the periphery are obtained.
The obtained plurality of spherical powers and prism values are stored in the memories 1 to n, respectively, and the spherical powers and prism values stored in the memories 1 to n are processed by the processing circuit 3.
7 is compared. At this time, it is possible to determine whether the lens to be measured is a spherical lens or an aspherical lens by comparing the value of the central part of the lens to be measured with the value of the peripheral part. That is, the processing circuit 37 as the lens determination means can determine that the lens is an aspheric lens when the value of the spherical power at the peripheral portion is smaller than the value at the central portion of the lens to be inspected. At this time, the lens determination unit determines whether the central part or the peripheral part of the lens to be inspected is determined by the magnitude of the prism value.

Incidentally, also in the case of a progressive lens, the value of the spherical power on the test lens changes. However, when there is a portion where the spherical power is partially larger in the peripheral portion than in the central portion of the lens to be inspected, it can be determined that the lens is a progressive multifocal lens or a bifocal lens. Whether the lens is a bifocal lens, a single lens, a spherical lens or an aspherical lens can be easily determined. In this case, the result of determining whether the lens is a spherical lens or an aspherical lens is also displayed at the bottom of the screen of the monitor 3.

Without considering such prism values, the test lens 30 may determine whether it is a progressive multifocal lens or a single lens, a spherical lens, an aspheric lens, or the like. That is, it can be known by comparing the spherical powers S0, S1 and S2 indicated by the positions a0, a1 and a2 of the arrow in FIG. 3, particularly by comparing the spherical powers S1 and S2 indicated by the positions a1 and a2.

For example, by measuring the spherical powers S1 and S2 of the lower part shown by the circle 1 and the upper part shown by the circle 2 of the spectacle lens 31 of the spectacles (glasses) shown in FIG.
By confirming the magnitude of the absolute value of the difference, it is possible to know whether the spectacle lens 31 as the test lens is a progressive multifocal lens or a single lens, a spherical lens, an aspherical lens, or the like.

That is, the lens meter shown in FIG. 1 is set to the automatic progressive discrimination mode, and as shown in FIG.
Is displayed at the top of the display. Further, the spherical power S, the cylindrical power C, the cylindrical axis angle A, the prism value P [the upper side indicates the prism value Px in the X direction (left and right direction), and the lower side indicates the Y value.
It shows the prism value Py in the direction (front-back direction). )] And the like are displayed on the upper right of the display screen 3a, and a display 40 indicating the measurement position is displayed on the lower left of the display screen 3a. In the display 40, a schematic spectacle lens shape 41 is displayed.
Is displayed on the portion located below the spectacle lens, and the spectacle lens shape 41 of the display 40 indicates that the refraction characteristics of the portion located below the spectacle lens are measured.

In FIG. 5, concentric marks M1 and M2 are shown.
Is a mark indicating a position concentric with the measurement optical axis of the measurement optical system 20. T is a cross-shaped target mark.

Therefore, as shown in FIGS. 1 and 2, the nose pad B of the glasses M is applied to the nose contact member 9 and
While rotating the lens downward and moving it to the left and right, the lens to be inspected 30 of the glasses M
Set on 3. Next, the lever 8 is tilted forward to move the lens abutment 7 forward, and a portion corresponding to the lower side of the test lens 30 shown in FIG. Align with the approximate center of the measurement optical system. At this position, the movement of the test lens 30 is stopped, and the test lens 3
The spherical power of 0 is measured as S1 and stored in the memory 1.

When the measurement is completed and stored, the processing circuit 37 corresponds to the portion indicated by the circle 2 in the spectacle lens shape 41 of the display 40, that is, the upper side of the spectacle lens as shown in FIG. Instruct the measurement of the refraction characteristic of the part to be measured.

Therefore, the lever 8 is rotated upward to move the lens abutment 7 toward the main body 2, and the portion indicated by the circle 2 of the test lens 30 shown in FIG. Adjust to the approximate center of the optical system. At this position, the test lens 3
0 is stopped, and the spherical power of the test lens 30 is set to S2.
And stores it in the memory 2.

A processing circuit determines whether or not the absolute value of the difference between the spherical powers S1 and S2 is larger than a predetermined value (for example, 0.5D), ie, whether or not | S1−S2 |> | 0.5D |. 37.

When | S1−S2 | is larger than | 0.5D |, the processing circuit 37 determines that the test lens 30 is a progressive lens. Then, the processing circuit 37, as shown in FIG. 7, displays the typical spectacle lens shape 41 on the display screen 3a.
Are enlarged and displayed, and the distance portion 42 and the progressive portion 43 are displayed.
In addition, boundary lines 46, 46 for dividing the near portion 44 and the distortion regions 45, 45 are displayed. In this state, the lever 8 is tilted forward to move the lens abutment 7 forward. As a result, the processing circuit 37 displays the portion measured as shown in FIG. 8 by a diagonal line 47, and gradually widens the diagonal line 47 from the distance portion 42 toward the progressive portion 43 and the near portion 44. It indicates that the measurement is sequentially performed from 42 toward the progressive portion 43 and the near portion 44 side.

On the other hand, if the absolute value of the difference between the spherical powers S1 and S2 is smaller than a predetermined value (for example, 0.5D), the processing circuit 37 determines that the lens 30 to be inspected is a single lens.
When the absolute value of the difference between the spherical powers S1 and S2 is substantially the same, the processing circuit 37 determines that the lens is a spherical lens, and the absolute value of the difference between the spherical powers S1 and S2 is about 0.1. In this case, it is determined that the lens is an aspheric lens. Then, a result based on such a determination is displayed as, for example, "aspheric lens" on the lower right of the display screen 3a as shown in FIG. 6B, for example.

[0036]

As described above, according to the first aspect of the present invention, there is provided a lens measuring means for measuring distribution information of optical characteristics of a lens to be measured, and a method for measuring the distribution information on the lens to be measured measured by the lens measuring means. Since the apparatus has a lens determination unit that determines whether the test lens is a spherical lens or an aspherical lens based on the distribution of the spherical power value, it is possible to easily and quickly know whether the test lens is a spherical lens or an aspherical lens. be able to.

Further, according to the present invention, there is provided a lens measuring means for measuring distribution information of optical characteristics of the lens to be inspected, a value of the spherical power of the lens to be measured and a value of the prism measured by the lens measuring means. Lens determination means for determining whether the test lens is a spherical lens or an aspheric lens
With this configuration, in this case also, it is possible to more easily know whether the test lens is a spherical lens or an aspherical lens. In this case, when the value of the spherical power of the peripheral part is smaller than the spherical power of the central part of the test lens, it can be determined that the lens is an aspheric lens. Further, the distinction between the central part and the peripheral part of the lens to be inspected can also be determined by the magnitude of the prism value. In addition, in the case of a progressive lens, the value of the spherical power on the test lens changes like a spherical lens or an aspherical lens.
If there is a portion having a spherical power that is partially larger in the peripheral portion than in the central portion of the lens to be inspected, it can be determined that the lens is a progressive multifocal lens or a bifocal lens. This determination can be made from a change in the prism amount.

According to a third aspect of the present invention, the lens determining means determines the degree of the aspherical surface from the optical center of the lens to be measured and displays it on the display means. Whether the lens is an aspheric lens made for the purpose of finishing, or an aspheric lens for the purpose of obtaining a natural view without distortion.

According to a fourth aspect of the present invention, the lens determining means determines whether the lens to be inspected is an aspherical progressive lens or an aspherical single focus lens by using at least two spherical powers of the lens to be inspected. Is determined so as to be displayed on the display means based on the difference between the values of the aspherical lenses, so that the type of the aspherical lens can be easily determined (identified) and displayed, and more accurate The type can be known easily and quickly.

Further, in the invention of claim 5, since the measurement of the optical characteristics is performed at different points in time, the measurement is performed at a plurality of points, so that a lens array plate in which a large number of small lenses are aligned, a large number of small lenses, or the like. The spherical and aspherical surfaces of the lens can be easily and quickly determined without employing a configuration in which mapping is performed using a pattern plate provided with holes. That is, when measuring the left and right lenses of the glasses, whether the left and right lenses (test lenses) of the glasses are progressive lenses or single lenses, and if they are single lenses, whether they are spherical lenses Whether the lens is an aspherical lens or the like can be easily determined simply by setting a program without changing the basic configuration of the existing lens meter.

[Brief description of the drawings]

FIG. 1 is a perspective view of a lens meter as a lens specifying device according to the present invention.

FIG. 2 is a partially enlarged explanatory view showing a usage example of the lens meter of FIG. 1;

FIG. 3 is an explanatory diagram showing an optical system of the lens meter shown in FIG.

FIG. 4 is an explanatory diagram of a test lens shown in FIG. 1;

FIG. 5 is an explanatory diagram showing a display example on a display unit of the lens meter shown in FIGS. 1 to 3;

FIGS. 6A and 6B are explanatory diagrams showing display examples on a display unit of the lens meter shown in FIGS. 1 to 3;

FIG. 7 is an explanatory diagram showing a display example on a display unit of the lens meter shown in FIGS. 1 to 3;

FIG. 8 is an explanatory diagram showing a display example on a display unit of the lens meter shown in FIGS. 1 to 3;

[Explanation of symbols]

 Reference numeral 20: measuring optical system (lens measuring means) 31: lens to be tested 37: processing circuit (lens determining means)

Claims (5)

[Claims] 1. A lens measuring means for measuring distribution information of an optical characteristic of a lens to be measured, and a lens having a spherical surface based on a distribution of a spherical power on the lens to be measured measured by the lens measuring means. A lens specifying device comprising: a lens determining unit that determines whether the lens is a lens or an aspheric lens. 2. A lens measuring means for measuring distribution information of optical characteristics of a lens to be measured, and the lens to be measured is spherical based on a value of a spherical power of the lens to be measured and a value of a prism measured by the lens measuring means. A lens identification device having a lens determination unit that determines whether a lens is an aspheric lens. 3. The lens identification device according to claim 1, wherein the lens determination unit obtains a degree of an aspherical surface from an optical center of the test lens and displays the obtained degree on a display unit. 4. The lens determination means determines whether the test lens is an aspheric progressive lens or an aspheric single focus lens based on a difference between spherical power values of at least two points of the test lens. 3. The lens specifying apparatus according to claim 1, wherein the apparatus is set so as to determine and display the information on the display unit. 5. The lens identification device according to claim 2, wherein the measurement of the optical characteristics is performed at a plurality of points at different times.