JP2000131190A - Lens meter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lens meter for measuring the center thickness of a lens by utilizing an existing configuration without using any instrument such as a vernier calipers and at the same time obtaining the refractive index of the lens from the center thickness. SOLUTION: A lens meter is provided with an operation control circuit 23 for obtaining the optical characteristics of a lens L to be inspected based on an output signal from line sensors 21 and 22 by projecting measurement luminous flux that is transmitted through the lens L to be inspected to the line sensors 21 and 22 (light reception means). The lens meter is also provided with a marking point device 25 for outputting dimension data by measuring the curvature shape, thickness, and the like of the refraction surface of the lens L to be inspected, and at the same time the operation control circuit 23 is designed to obtain the refractive index of the lens L to be inspected from the dimension data and the optical characteristics of the operation control circuit 23.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens meter for measuring the optical characteristics of a test lens.

[0002]

2. Description of the Related Art As a method of obtaining the refractive index of a lens material such as a glass material or a plastic, a prism having a known apex angle is formed on a test object, and the prism is obtained from the amount of deflected light rays by the prism. A method is known in which the reflectance is obtained from the reflectance of the surface of the specimen.

[0003] However, in the former case, a prism must be formed, and it is not possible to measure an object already in the shape of a lens. In the latter case, the surface of the spectacle lens is often provided with a coating such as an anti-reflection or an anti-scratch, so that the reflectance cannot be measured.

Various methods have been proposed for measuring the refractive index of a lens-shaped test object. For example, there is a method of calculating the refractive index from the difference between the refractive power (degree) in air and water. However, since the lens is immersed in water, the measurement becomes complicated. Since the difference in refractive index of the lens becomes smaller and the apparent number of lenses becomes weaker than in air, the measurement sensitivity of the lens meter must be increased.

Further, as another method, a method of obtaining the refractive index from the difference between the actual thickness of the lens and the optical path length by using light interference has been considered, but it is complicated and requires a dedicated optical system. Met.

[0006]

Therefore, it is desired to determine the refractive index of a lens with a simple configuration.

In a spectacle shop, for example, when a customer who has damaged one of the spectacle lenses visits the store and requests the customer to repair the spectacles, a material having substantially the same refractive index if the left and right powers are approximately the same. It is desirable to prescribe with.

However, the refractive index of a spectacle lens brought by a customer is often unknown. In some cases, the manufacturer's name or type is engraved on the lens surface as a hidden mark, but if the lens surface is coated or has many scratches, the manufacturer's name or type can be identified from the hidden mark. Often difficult.

In addition, it is generally known that the center thickness of a lens differs depending on the refractive index even if the lens has the same power. That is, a spectacle lens made of a material having a high refractive index has a small center thickness even if it has the same power.

As a result, even if the refractive power of the lens is simply measured and the eyeglasses are repaired using a lens having the same refractive power, the center thickness of the left and right lenses of the eyeglasses may be different, which is not preferable. .

Incidentally, a skilled person can roughly estimate the refractive index from the lens power and the center thickness.

However, in the case of an inexperienced person, it is necessary to obtain a refractive index from the lens power and the center thickness of the lens as compared with a catalog of a lens maker, which is troublesome. Moreover, conventionally, since the lens meter does not have a mechanism for measuring the center thickness, it has been necessary to use an instrument such as a caliper to measure the center thickness of the lens, which is troublesome.

Accordingly, the present invention provides a lens meter that can measure the center thickness of a lens using an existing configuration without using instruments such as calipers, and can determine the refractive index of the lens from the center thickness. It is intended to do so.

[0014]

In order to achieve the above object, according to the first aspect of the present invention, a measuring light beam transmitted through a lens to be inspected is projected on a light receiving means, and the measuring light flux is projected on the basis of an output signal from the light receiving means. In a lens meter having arithmetic means for calculating optical characteristics of a lens to be measured, the lens meter includes a measuring means for measuring dimensions of the lens to be measured and outputting dimensional data, and the arithmetic means is configured to calculate the optical characteristics from the dimensional data and the optical characteristics. The lens meter is set so as to obtain the refractive index of the test lens.

According to a second aspect of the present invention, the measuring means includes at least three moving members which are moved up and down to contact the upper surface of the lens to be inspected, and detecting means for detecting a moving position of the moving member. Wherein the calculation means is set so as to obtain surface shape data of the refraction surface of the lens to be measured as the dimension data based on a detection signal from the detection means.

The invention according to a third aspect is characterized in that the moving member is a marking needle for marking the axial direction of the lens to be inspected.

According to a fourth aspect of the present invention, the detecting means includes: a reflecting surface provided at an upper end of the moving member; a measuring light projecting means for projecting a measuring light beam on the reflecting surface; A one-dimensional or two-dimensional light-receiving sensor that receives light reflected by the surface is provided.

The invention according to claim 5 is characterized in that the light receiving sensor for detecting the position of the moving member is common to the light receiving sensor for measuring the optical characteristics of the lens to be inspected.

The invention according to claim 6 is characterized in that the calculating means obtains the refractive index and the material of the lens to be inspected from the refractive power of the optical characteristics obtained from the light receiving means and the surface shape data. I do.

[0020]

Embodiments of the present invention will be described below with reference to the drawings. (1) First Embodiment <Structure> In FIG. 5, 1 is a main body of a lens meter, 2 is a keyboard provided at a lower front end of the main body 1, 3 and 4 are switches provided at a left end of the keyboard 2, Reference numeral 5 denotes a plurality of membrane switches provided at the center of the keyboard 2, and reference numeral 6 denotes a numeric keypad provided at the right end of the keyboard 2. The description of the functions of the switches 3 and 4, the plurality of membrane switches 5, the numeric keypad 6, and the like is omitted, but the switches 3 and 4, the plurality of membrane switches 5, the numeric keypad 6, and the like are used when measuring the optical characteristics.

A display device 7 such as a CRT or a liquid crystal display is provided on the upper end of the main body 1 as a display means, a printer 8 is provided on a side of the main body 1, and an upper optical device is provided on a front side surface of the main body 1. Component storage unit 9 and lower optical component storage unit 1
0 are protrudingly provided at intervals above and below. A lens receiving table 11 is integrally provided at an upper end of the optical component lower storage section 10. On this table 11, a cylindrical lens receiver 12 is mounted.

The upper optical component storage section 9 and the lower optical component storage section 10 are provided with a measuring optical system (see FIG. 1) extending over them. The measuring optical system has a light receiving optical system 9a provided in the upper optical component storage unit 9 and an illumination optical system 10a provided in the lower optical component storage unit 10.

This illumination optical system 10a has an L
ED (light emitting diode) 13, pinhole 14, lens 15, pattern plate 16 such as slit, reflection mirror 17,
The lens 18 and the like are provided in this order. Also, the light receiving optical system 9
a denotes a collimator lens 19, a reflection mirror 20, a pair of parallel one-dimensional line sensors (line CCDs) 21 and
2 as light receiving means (light receiving sensor). In this embodiment, a pair of parallel line sensors 21 and 22 are provided as light receiving means. Instead of the line sensors 21 and 22, a two-dimensional area CCD (area sensor) is used as a light receiving means (light receiving sensor). You can also.

The output signals from the line sensors 21 and 22 are input to a calculation control circuit (calculation means) 23. The arithmetic control circuit 23 controls the light emission of the LED,
Based on the output signals from the one-dimensional line sensors 21 and 22, S (spherical power), C (cylindrical power), A
Refraction characteristics (optical characteristics) such as (cylindrical axis angle) and P (prism amount) are displayed on the screen 7 a of the display device 7.

A lens holding device (lens holding mechanism) 24 is provided on the front of the main body 1 between the optical component housings 9 and 10 as lens holding means, and a marking device (marking device). Point mechanism) 25 is a marking means (shafting device)
It is provided as. As shown in FIGS. 6 and 7, the marking device 25 includes a shape measuring means for measuring a curvature (surface shape data) as a dimension of a refraction surface of the lens to be measured as dimension data, and a shape measuring device for the lens to be measured. It also serves as a thickness measuring means for measuring thickness (dimension) as dimension data. Since a well-known structure is employed for the lens holding device 24, a detailed description thereof will be omitted.

The marking device 25 has vertically extending support shafts 26, 26 as shown in FIGS. The support shafts 26, 26 are vertically movably held at a position (not shown) at the front of the main body 1, and are urged to a predetermined upper position by a spring means (not shown). This support shaft 2
The upper and lower positions of 6, 6 can be detected by a potentiometer 26a linked to the support shafts 26, 26.

The marking device 25 includes support shafts 26, 26.
A bracket 27 fixed to the lower end of the bracket 27, a rotating shaft 28 extending to the left and right and rotatably held around the axis of the bracket 27, and a plate-shaped operating lever fixed to one end of the rotating shaft 28 29, and three housings 30 fixed to the rotating shaft 28 on the left and right at predetermined intervals.

As shown in FIG. 8, the housing 30 has support walls 30a and 30 extending in a direction parallel to the plate surface of the operation lever 29.
b. In addition, the marking device 25 is
Has a detection shaft 31 extending in a direction orthogonal to the plate surface of the detection shaft. The detection shaft 31 penetrates through the support walls 30a and 30b and
0 protrudes outside.

The detection shaft 31 has a flange 31 for receiving the spring, which is vertically spaced in FIG.
a and a flange 31b for movement restriction, and the rack 3 is located between the flanges 31a and 31b.
1c is formed. A coil spring 32 is interposed between the support wall 30a and the flange 31a.
Are in contact with the support wall 30b.

Further, the marking device 25 includes a potentiometer (detecting means) 33 attached to the housing 30, a pinion 34 fixed to the output shaft of the potentiometer 33 and meshing with the rack 31c, and a detecting shaft (moving member) 31. An arm 35 integrally provided at the outer end on the side of the flange 31b, a holding portion 36 attached to the tip of the arm 35, and a marking pin (a marking needle as a moving member) 37 attached to the holding portion 36. And an ink supply device 38 (see FIG. 6) attached to the front of the main body 1 as shown in FIG. The output signal from the potentiometer 33 is input to the arithmetic and control circuit 23. The operation lever 29 and the arm 35 are provided in parallel, and the detection shaft 31 and the marking pin 37 are provided in parallel.
The marking pin 37 is provided in a crank shape.

As shown in FIGS. 9 and 10, the ink supply device 38 includes a container body 39 having a bottom and a shallow rectangular shape, a sponge disposed in the container body 39 and impregnated with ink, and a porous material. An ink holder 40 such as a member, and a container body 39
A cover 41 that covers the opening on the front side of the cover 41, a slide plate 42 disposed in front of the cover 41, and a slide plate 42 attached to the cover 41 so that the slide plate 42 is slidably held on the cover 41 left and right. Holding plate 43.

The lid 41 is provided at equal intervals on the left and right
Window holes 41a, 41b, 41c are formed, and the holding plate 4
3 is a window hole 43 corresponding to the window holes 41a, 41b, 41c.
a, 43b and 43c are formed. Further, window holes 42a, 42b, 42c are formed in the slide plate 42 at the same intervals as the window holes 41a, 41b, 41c. When the slide plate 42 is moved to the left as shown in FIG.
b, 41c, respectively, and the window holes 43a,
43b, 43c. When the slide plate 42 is moved to the right as shown in FIG.
1b and 41c cover. <Operation> Next, the operation of the lens meter having such a configuration will be described.

At the time of the mark after the measurement of the refraction characteristics (optical characteristics) of the lens L to be inspected, the slide plate 42 is moved to the left as shown in FIG. 9 so that the window holes 42a, 42b and 42c are moved to the window holes 41a and 41a.
41b, 41c and window holes 43a, 4c respectively.
3b and 43c. In this state, 3
The tips of the two marking pins 37 can be brought into contact with the ink holding member 40. Therefore, by applying the ink from the ink holder 40 to the tips of the three marking pins 37, the marking can be performed on the lens L in the same manner as in the related art.

Normally, as shown in FIG.
1 is moved to the right to cover the window holes 41a, 41b and 41c with the slide plate 41 so that the tip of the marking pin 37 does not contact the ink holding member 40. Therefore, in this state, the tip of the marking pin 37 is not inked. In this state, the curves of the front refracting surface Lf and the rear refracting surface Lb of the test lens L are measured as follows. i. Measurement of Shape (Curve, Curvature) of Front Refraction Surface Lf The test lens L is placed on the lens receiver 12 with the front refraction surface Lf facing up as shown in FIG. 1, and the optical center of the test lens L is measured. In addition to aligning with the optical axis of the optical system, when the lens L to be inspected has a cylindrical axis, the cylindrical axis is aligned with the X axis in the left-right direction. In this state, the lens L to be inspected is held on the lens receiver 12 by the lens holding device 25.

Next, the operating lever 29 is tilted horizontally from the state shown in FIG. 6 as shown in FIG. 7, the marking pin 37 is turned up and down, and a spring (not shown) for urging the support shaft 26 downward is shown. The operating lever 29 is pressed and displaced downward against the spring force of (2). Accordingly, an output signal from the potentiometer 26a linked to the support shaft 26 is input to the arithmetic and control circuit 23.

Then, the operating lever 29 is further depressed and displaced downward to bring the three marking pins 37, 37, 37 into contact with the front refracting surface Lf of the lens L to be measured. At this time, each of the three housings 30, 30, 30 is displaced downward against the spring force of the spring 32, and the detection signal from the potentiometer 33 of each housing 30 is transmitted to the arithmetic control circuit 23 by the surface shape data and the thickness. It is input as dimensional data such as data.

The arithmetic control circuit 23 receives the output signals from the potentiometer 26a and the three potentiometers 33,
The height of the tip of 7, 37, 37 is obtained by calculation, and RAM
12 is stored. The arithmetic control circuit 23 obtains the curve of the front refraction surface Lf of the lens L to be inspected and the position of the curve in the height direction from the heights and the intervals of the three marking pins 37, 37, and 37 and stores them in the RAM 12. ii. Measurement of Shape (Curve) of Rear Refraction Surface Lb On the other hand, the test lens L is placed on the lens receiver 12 with the rear refraction surface Lb facing up as shown in FIG. To the optical axis of the measurement optical system,
When there is a cylindrical axis, the cylindrical axis is oriented in the left-right direction and aligned with the X axis. In this state, the lens L to be inspected is held on the lens receiver 12 by the lens holding device 25.

Next, the operating lever 29 is moved to the position shown in FIG.
7, the operating lever 29 is turned horizontally against the spring force of a spring (not shown) for urging the support shaft 26 downward after the marking pin 37 is turned up and down as shown in FIG. It is pressed and displaced downward. Accordingly, an output signal from the potentiometer 26a linked to the support shaft 26 is input to the arithmetic and control circuit 23.

Then, the operation lever 29 is further depressed and displaced downward to bring the three marking pins 37, 37, 37 into contact with the rear refracting surface Lb of the lens L to be measured. At this time, each of the three housings 30, 30, 30 is displaced downward against the spring force of the spring 32, and the detection signal from the potentiometer 33 of each housing 30 is transmitted to the arithmetic control circuit 23 by the surface shape data and the thickness. It is input as dimensional data such as data.

When the arithmetic control circuit 23 receives output signals from the potentiometer 26a and the three potentiometers 33, the three control pins 3
The height of the tip of 7 is calculated by calculation and stored in the RAM 12. The arithmetic control circuit 23 has three marking pins 37, 3
The rear refracting surface L of the test lens L is determined from the height and the distance
Find the curve b and the position of the curve in the height direction and calculate RA
It is stored in M12. iii. Calculation of lens center thickness When the arithmetic control circuit 23 obtains the data of the curve of the front refraction surface Lf and the rear refraction surface Lb of the lens L to be measured and the position of the curve in the height direction as described above, From these data, the thickness of each position in the radial direction of the test lens L is obtained,
12 is stored. The thickness of each position corresponds to the lens L to be inspected.
Center thickness is also included. iv. Optical property measurement Next, LED1
3 to emit light, and the measurement light flux from the LED 13 is transmitted to the pinhole 14, the lens 15, and the ring hole 16 of the pattern plate 16.
a, the lens L to be inspected via the reflection mirror 17 and the lens 18
Incident on Thus, the circular measurement light beam transmitted through the ring hole 16a of the pattern plate 16 transmits through the lens L to be measured. The measurement light beam transmitted through the test lens L is partially projected onto a pair of parallel line sensors 21 and 22 via a collimator lens 19 and a reflection mirror 20, as shown in FIGS. Outputs (output signals) from the line sensors 21 and 22 are input to the arithmetic and control circuit 23.

In this measurement, the arithmetic control circuit 23
A cross line indicating the optical axis of the measurement optical system is displayed on the screen 7a of the display device 7, and the optical axis of the lens L to be measured is displayed on the screen 7 based on the amount of prism obtained from the outputs of the line sensors 21 and 22.
a. Therefore, the test lens L is moved while looking at the screen 7a so that the optical axis of the test lens L coincides with the intersection of the crosshairs (the measurement optical axis of the measurement optical system), and the refractive power at this coincidence point is measured. .

Incidentally, when the test lens L is not mounted on the lens receiver 12, that is, when the test lens L is not disposed in the middle of the measuring optical path, or when the test lens L has a cylindrical axis. Otherwise, as shown in FIG. 3, the circular pattern 16a '
Are projected onto the line sensors 21 and 22. When the test lens L has a cylindrical axis, a part of the elliptical pattern 16a '' is projected onto the line sensors 21 and 22 as shown in FIG. v. Refractive index of the lens L to be inspected Here, the vertex refractive index of the lens is S, the curvature of the lens surface (front refractive surface Lf) is r1, and the lens back surface (rear refractive surface Lb).
Let r2 be the curvature of the lens, d be the center thickness of the lens, and n be the refractive index of the lens. If the apex refractive index S is known, the refractive index n of the test lens L can be obtained from the following equation.

[0043] Here, the vertex refractive index S of the lens can be obtained as a basic function of the lens meter.

Accordingly, as described above, the curve (curvature r1) of the front refraction surface Lf of the lens L to be measured obtained in i., And the curve (curvature) of the rear refraction surface Lb of the lens L to be measured obtained in ii. r
2), the refractive index n of the test lens L can be obtained from the center thickness d of the test lens L and the vertex refractive index S of the lens obtained in iii. In addition, by obtaining the thickness and the refractive index of the lens to be measured, the material and the like of the lens to be measured can be obtained. By the way, when the customer breaks one of the left and right spectacle lenses in the spectacles (glasses), and wants to replace the damaged spectacle lens with a new one, the refractive index (refractive characteristic of the other undamaged spectacle lens) is changed. ) Can be roughly determined from the relationship with the thickness of the lens L to be measured, that is, whether the degree of refraction of the lens L to be measured is a high refractive index, a medium refractive index, or a low refractive index. I just want to be able. Therefore, as described above, the marking pin (the marking needle) 37
The refractive index n of the test lens L obtained by using the formula (1) cannot always be obtained with high accuracy. However, the degree of refraction of the test lens L is any of a high refractive index, a medium refractive index, and a low refractive index. Can be easily determined, the relationship between the lens manufacturer and material and the lens data such as the refractive index and thickness are recorded in advance in the recording means of the computer, and the degree of refraction of the test lens L obtained by the measurement is recorded. By comparing and detecting which of the lens data recorded in the means is closer by a computer, it is possible to know the material and manufacturer of the undamaged spectacle lens, and from the result, the undamaged spectacle lens A spectacle lens having a damaged lens frame can be made using a lens having the same or substantially the same material as that of the spectacle lens.

When the refraction characteristics of the spectacle lens (test lens) in which the spectacles are not damaged are measured by a lens meter, and the measurement result indicates that the spectacle lens is a progressive lens, The curve of the refraction surface of the spectacle lens measured by the three marking pins (marking needles) 27 is obtained at the distance portion of the spectacle lens which is a progressive lens. That is, the distance portion of the spectacle lens is measured by the above-described three mark pins (mark point needles) 27, and the curve of the refractive surface of the spectacle lens in the distance portion is obtained.

In this case, the curve value is measured on the side as close to the progressive part as possible. The configuration of the measuring optical system for determining whether or not the lens is a progressive lens from the refraction characteristics of the spectacle lens may be a configuration using a single measurement light beam, or a configuration using a large number of measurement light beams using a lens array or a large number of apertures. May be.
In the configuration using one measurement light beam, when the test lens is moved back and forth by predicting the position where the progressive portion exists with respect to the measurement optical axis, if there is a large change in the spherical power (addition power), It turns out that it is a progressive part. In the case of using a large number of measurement light beams by using a lens array or a large number of apertures, the distance portion and the progressive portion can be obtained from the distribution of the cylindrical power and the distribution of the spherical power.

Further, the above-mentioned three marking pins (marking needles) 2
By arranging the three marking pins (marking needles) 27 such that the surface connecting the axes of 7 is slightly offset from the optical axis of the lens receiver 12 in the direction opposite to the front wall of the main body 1, the eyeglass lens The curve of the refraction surface of the spectacle lens can be measured without regard to whether the (test lens) is a single lens or a progressive lens. This is because, when the spectacle lens is a progressive lens, the spectacle lens of the spectacles (glasses) is usually lower than the geometric center of the lens frame (the lower side when wearing spectacles).
Therefore, a backing plate having a plate surface extending in the left, right, up and down directions is provided on the main body 1 so as to be able to move back and forth, and a left and right movable nose support member is provided on the backing plate. When measuring the refraction characteristics of the spectacle lens by supporting the nose pad of the spectacles, make sure that the lower side of the spectacle lens frame (the lower side with the spectacles on) is in contact with the backing plate Will do. As a result, in a lens meter having such a nose pad supporting member, the eyeglass lens is arranged so that the measurement optical axis of the lens meter is located substantially at the center of the lens frame, and thus three mark pins (mark needles) are provided. Since 27 is in contact with the spectacle lens on the side where the spectacle bridge is located from the geometric center of the lens frame, that is, in the case of a progressive lens, three marking pins (marking needles) 27 are located far from the spectacle lens. Since the lens is in contact with the lens, the curve of the refracting surface of the spectacle lens can be measured without worrying whether the spectacle lens (test lens) is a single lens or a progressive lens. vi. Others The configuration of obtaining the dimensional data such as the curve (curvature that is the surface shape data) on both surfaces (both refracting surfaces) of the lens L to be measured and the height and thickness of each position of the curve is described in this embodiment. However, the present invention is not limited to this, and the configuration of the embodiment as described below can also be used. (2) Second Embodiment FIGS. 11 to 19 show a second embodiment of the present invention.

In this embodiment, the structure of the potentiometer 26a and the housing 30 of the marking device 25 in the first embodiment is omitted, and the three holding portions 36 are marked as shown in FIGS. A pin (marking needle as a moving member) 37 is held so as to be vertically movable. The holding portion 36 is formed hollow as shown in FIG.

The marking pin 37 is composed of a lower pin 44 and an upper pin 45. The lower pin 44 is
The lower wall 36a is penetrated, and a flange 44a and a male screw portion 44b are provided at the upper end to prevent the cap 44 from falling off.

The upper pin 45 has a large-diameter shaft portion 45a and a small-diameter shaft portion 45b. This small diameter shaft portion 45b
As shown in FIG. 18C, a flat surface 45c for preventing rotation is formed. The small-diameter shaft portion 45b penetrates the upper wall 36b of the holding portion 36 and is inserted into the holding portion 36. The male screw 4 of the lower pin 44 is provided at the lower end of the small-diameter shaft 45b.
4b is screwed coaxially. In addition, a spring 46 is interposed between the upper wall 36b and the flange 44a to make the flange 44a contact the lower wall 36a. Further, a reflection surface 45d at an angle of 45 ° with respect to the axis is formed at the upper end of the upper pin 45. Three such mark pins 37 are provided on the left and right at an equal pitch.

At the lower part of the upper optical system housing 9, three LEDs 46 corresponding to the three marking pins 37 as shown in FIG.
Reference numerals a, 46b, and 46c are attached at positions (not shown) as measurement light projection means. These LEDs 46a, 46
b and 46c are controlled by the arithmetic and control circuit 23 to emit visible light.

Further, a pattern plate 47 is provided immediately below the collimator lens 19. This mask pattern plate 4
Reference numeral 7 denotes a mask layer 4 that transmits infrared light and blocks visible light.
9 is provided on a transparent substrate 48. This mask layer 4
9, slits 49a and 49b parallel to each other are provided in FIG.
It is formed as shown in FIGS. The directions of the slits 49a and 49b are defined as slit patterns 49a 'and 49b' when the slit light beams transmitted therethrough are projected on the line sensors 21 and 22.
Is set so as to be orthogonal to the direction in which the line sensors 21 and 22 extend as indicated by the two-dot chain line.

Therefore, after setting the lens L to be inspected on the lens receiver 12 as in the first embodiment, the operating lever 29 is tilted horizontally from the state of FIG. 16 and the marking pin 37 is moved up and down as shown in FIG. At the same time, the operation lever 29 is moved downward to bring the three marking pins 37 into contact with the front refracting surface Lf or the rear refracting surface Lb of the test lens L as shown in FIG. 11 or FIG. At this time, each marking pin 37 moves up and down against the spring force of the spring 46, and the lower end of each marking pin 37 contacts the refracting surface Lf or Lb of the lens L to be measured. At this time, the height of the reflecting surface 45d of each mark pin 37 differs depending on the curvature (curve) of the refracting surfaces Lf and Lb of the lens L to be measured.

In this state, the LEDs 46a, 46b, 46c
Are sequentially emitted, and the height of the contact point of each mark pin 37 with the lens L to be measured is determined. The method of obtaining this is as follows.
Therefore, the relationship between the LED 46a and the corresponding marking pin 37 will be described, and the other will be omitted.

Now, when the LED 46a emits light, this L
The light beam from the ED 46a is emitted toward the reflection surface 45d of the marking pin 37 corresponding to the LED 46a. The luminous flux reflected by the reflection surface 47 passes through the slits 49a and 49b to become slit light, and thereafter, the collimator lens 1
9, a pair of line sensors 21 via a reflection mirror 20,
A projection pattern 49a on the reference numeral 22 as shown by a two-dot chain line in FIG.
, 49b '. FIG.
9 schematically shows a light beam transmitted through 9a.

The line sensor 21 and the projection pattern 49
From the distance between the intersection points P1 and P1 'with the a' and 49b 'and the distance between the intersection points P2 and P2' with the line sensor 22 and the projection patterns 49a 'and 49b', the lower end of the mark pin 37 corresponding to the LED 46a, that is, the mark point. The height of the contact point of the pin 37 with the test lens L can be determined.

Such measurement is performed for the remaining LEDs 46b and 46b.
By causing c to emit light, the height of the lower end of the remaining two marking pins 37, that is, the height of the contact point of the marking pin 37 with the lens L to be measured can be obtained. In addition, such measurement is performed on each of the refraction surfaces Lf and Lb of the lens L to be measured to determine the curvatures (curves) of the refraction surfaces Lf and Lb of the lens L to be measured and to determine the thickness of the lens Lb to be measured. Ask for. (3) Third Embodiment In the second embodiment, each reflecting surface 45 of each of the three marking pins 37.
The light beams from the LEDs 46a, 46b, 46c are guided to the pattern plate 47 side by using d, however, the invention is not necessarily limited to this. For example, the LEDs 46a, 46b, and 46c in the second embodiment are omitted, and the reflecting surfaces 45d of the three marking pins 37 are omitted.
As shown in FIG. 20, each of the three marking pins 37, 37, 37
The LEDs 46a ', 46b', and 46c 'may be directly attached to the upper end of the.

In this case as well, the LEDs 46 correspond to the contact positions (contact heights) of the three mark pins 37 with the lens to be inspected.
Since the heights of a ', 46b', and 46c change, the LED 46
The light fluxes a ′, 46b ′ and 46c ′ are directly
It will be irradiated towards the side. The configuration, operation, and effects other than this configuration are the same as those of the second embodiment, and thus description thereof will be omitted. (4) Fourth Embodiment FIGS. 21 and 22 show a fourth embodiment of the embodiment of the present invention. In this embodiment, the lens receiving table 11 is provided with a large-diameter light guide hole 50 (light guide portion).

Further, in this embodiment, as shown in FIG. 22, arc-shaped projections 51, 51 extending substantially semicircularly along the left and right portions of the light guide hole 50 are used as lens receivers on the lens receiving table 11. A slit-shaped notch 5 that is provided between the one end of the protrusions 51 and 51 and opened to the light guide hole 50.
2 is provided on the lens receiving table 11. This notch 52
Extends in a direction (front-back direction) orthogonal to the front of the main body 2.

Below the lens receiving table 11, a lens height detecting means (measuring means) 53 located in the optical component lower storage section 10 is provided as lens position detecting means (distance specifying means). ing. The lens height detecting means 53 includes a light source 54 and a line sensor (light receiving sensor) 55.
It is composed of This light source 54 (measuring light projection means)
Is mounted on the inner surface of the front wall 10a of the lower optical component storage section 10 via the bracket 10b, and the line sensor 55 is mounted on the lower surface of the lens receiving table 11 in the front-rear direction.

The light source 54 projects the measurement light beam 54a through the light guide hole 50 toward substantially the center of the arc-shaped projections 51, 51. Moreover, the protrusion 5
The rear refractive surface Lb of the test lens L mounted on the first and the first lens 51.
The measurement light beam 54a reflected by the (lower surface) is
It is projected on. Then, the measurement light beam 54a
From the upper surface of the lens receiving table 11 to the height of the center of the rear refracting surface Lb of the test lens L (the position of the test lens L on the measurement optical axis). It has become.

FIG. 22 (a) shows an example in which the light projecting means for projecting the measurement light beam is only the light source 54, but the invention is not necessarily limited to this. For example, FIG.
As shown in the figure, the measurement light beam from the light source 54 is
The illumination optical system S configured to project the light toward the test lens L via the reflection mirror 56 may be used as the light projection unit. In this embodiment, a reflection mirror 56 is fixed to the front wall 10a of the optical component lower storage section 10. In addition, the lens 55 is attached to the bracket 10b via holding means (not shown).

Moreover, the reflecting mirror 56 is fixed, but the reflecting mirror 56 is replaced with a galvanomirror, and the lens 5 is operated by operating the measuring light beam from the light source 54.
Surface data (curvature) and dimensional data such as height of the lower surface of 5 can be obtained. (5) Fifth Embodiment FIG. 23 (a) shows a fifth embodiment of the embodiment of the present invention. The height measuring means 60 shown in FIG.
(Distance specifying means), ie, the measuring means is a potentiometer (detecting means) 61 mounted in the optical component lower storage section 10.
And an L-shaped measuring arm 62 whose base end is fixed to an input shaft 61a of the potentiometer 61 as a moving member.

The measuring arm 62 and the lens receiving table 1
A spring 63 having a low spring pressure is interposed between the spring 1 and the spring 1 and biases the measuring arm 62 upward. Moreover, the distal end 62a of the measuring arm 62 is directed upward, and a probe 64 is mounted on the distal end 62a. When not in use, the measuring arm 62 is retracted by being rotated by a solenoid (not shown) or the like to a retracted position (right side in FIG. 23A).

In this embodiment, based on the output from the potentiometer 61 at the position where the probe 64 abuts on the lens 40 to be inspected by the spring force of the spring 63, the rear side of the lens L from the upper surface of the lens receiving table 11 The height of the center of the refraction surface Lb (the position on the measurement optical axis of the lens L to be measured) is determined. (6) Sixth Example FIG. 23 (b) shows a sixth example of the embodiment of the present invention. In the present embodiment, a tracing means 70 for tracing the rear refraction surface Lb of the lens L to be inspected in the radial direction is provided in the lower optical component storage section 10 as height measuring means (distance specifying means).

The tracing means 70 includes a bracket 71 fixed in the optical component lower storage section 10 and a bracket 71.
Guide rods 72, 72 fixedly erected parallel to each other at an interval in the front-rear direction, a feed screw 73 disposed in parallel between the guide rods 72, 72 and rotatably held by the bracket 71, It has a pulse motor 74 fixed to 71 and driving the feed screw 73 to rotate forward and reverse, and a slide base 75 supported by the guide rods 72 and 72 so as to be vertically movable and driven up and down by the feed screw 73.

The tracing means 70 includes a guide rail 7 held in parallel with the slide base 75 vertically.
, 76, a slider (moving member) 77 movably held by the guide rails 76, 76, and a slider 77 that is interposed between the upper end of the slide base 75 and the slider 77 to bias the slider 77 upward. And a magnescale 79 for detecting the vertical movement position of the slider 77. The magnescale 79 is provided on the slide base 75 in parallel with the guide rail 76.
The magnetic scale body 79a held by the
And has a read head 79b. The read head 79b detects the amount of vertical movement of the slider 77 in cooperation with the magnetic scale main body 79a, and outputs a detection signal.

Further, the tracing means 70 includes a slider 77
A measuring arm (moving member) 80 movably held back and forth, and a rack 81 provided on the measuring arm 80
, A pinion 82 meshing with the rack 81, and a pinion 8
2 for driving the pulse motor 83. The pulse motor 83 is fixed to the slider 77. The measurement arm 80 has an end portion 80a extending upward, and is formed in an L-shape. This tip 80a
Is mounted with a probe 84.

In such a configuration, the slide base 75
By controlling the rotation of the feed screw 73 by the pulse motor 74, the feed screw 73 is positioned at (i) when used and is positioned at (ii) when not used. Further, the tip 8 of the measuring arm 80
The probe 0a, that is, the probe 84 is positioned at (A) at the beginning of use and at (B) when not in use by the drive control of the pulse motor 82.

FIG. 23 (b) shows a state where the tracing means 70 is set at the initial position when used. In this state, the probe 84 is in contact with the center of the rear refracting surface Lb of the test lens L by the spring force of the spring 78. The contact position of the probe 84 is determined by the amount of movement from the position (ii) to (i) on the upper surface of the bracket 71 and the magnescale of the position where the probe 84 is in contact with the rear refractive surface Lb of the lens L to be measured. It can be seen from the output from 79.

From this position, when the pulse motor 82 is driven and controlled to move the measuring arm 80 to the right, the probe 84 receives the spring force of the spring 78 by the curved surface of the rear refractive surface Lb of the lens L to be measured. The slider 77 is displaced downward in opposition, and the slider 77 is displaced downward integrally with the measurement arm 70. At this time, the moving amount of the probe 84 of the measuring arm 80 to the right is obtained from the driving amount (the number of driving pulses) of the pulse motor 82, and the moving amount of the slider 77 downward is detected by the magnescale 79. Accordingly, by associating the rightward movement position of the probe 84 with the output signal (measurement signal) from the magnescale 79, the curved surface shape (curvature) in the radial direction of the rear refraction surface Lb of the lens L to be measured is changed. It can be obtained as a change in height. Thereby, it is possible to easily correct the refractive index in the peripheral portion of the lens L to be measured. (7) Others The structures of the first to third embodiments may be combined with the configurations of the fourth to sixth embodiments. In this case, it is necessary to “measure the shape of the surface of the lens L to be measured and the height thereof and then turn the lens to be measured L upside down” as in the first to third embodiments. In other words, the thickness of the test lens L can be obtained by measuring the shape (curve) of both surfaces of the test lens L and the height of each position of the curve only by setting the test lens L once.

[0072]

As described above, according to the present invention, according to the first aspect of the present invention, the measuring light beam transmitted through the lens to be measured is projected onto the light receiving means, and the lens to be measured is output based on the output signal from the light receiving means. A lens meter having arithmetic means for calculating the optical characteristics of the lens to be measured, wherein the measuring means measures the dimensions of the lens to be measured and outputs dimensional data, and the arithmetic means measures the lens to be inspected from the dimensional data and the optical characteristics. The refractive index of the lens is determined so that the center thickness of the lens can be measured without using an instrument such as a caliper, and the refractive index of the lens can be determined from the center thickness.

According to a second aspect of the present invention, the measuring means comprises at least three moving members which move up and down to contact the upper surface of the lens to be measured, and detecting means for detecting a moving position of the moving member. And the arithmetic means is configured to determine the surface shape data of the refraction surface of the test lens as the dimensional data based on the detection signal from the detection means. The center thickness of the lens can be measured.

According to a third aspect of the present invention, the moving member is a marking needle for marking a point for indicating the axial direction of the lens to be inspected. Therefore, the existing structure can be used without using a tool such as a caliper. The center thickness of the lens can be easily measured by using this, and the refractive index of the lens can be obtained from the center thickness.

According to a fourth aspect of the present invention, the detecting means includes: a reflecting surface provided at an upper end of the moving member; a measuring light projecting means for projecting a measuring light beam on the reflecting surface; Since a one-dimensional or two-dimensional light receiving sensor that receives light reflected by the surface is provided, the moving position of the moving member can be accurately obtained.

According to a fifth aspect of the present invention, since the light receiving sensor for detecting the position of the moving member is common to the light receiving sensor for measuring the optical characteristics of the lens to be inspected, the light receiving sensor for detecting the position of the moving member is provided. Can be omitted to reduce the number of parts stores.

According to a sixth aspect of the present invention, the arithmetic means is configured to obtain the refractive index and the material of the lens to be inspected from the refractive power of the optical characteristics obtained from the light receiving means and the surface shape data. Even when one of the spectacle lenses is damaged, a spectacle lens using a lens of the same material can be used.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a measurement optical system of a lens meter according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a use state of the measurement optical system shown in FIG.

FIG. 3 is an explanatory diagram showing a relationship between a light receiving sensor of a measurement optical system shown in FIGS.

FIG. 4 is an explanatory diagram showing a relationship between a line sensor and a measurement light beam of the measurement optical system shown in FIGS.

FIG. 5 is a schematic perspective view of a lens meter including the measuring optical system shown in FIGS.

FIG. 6 is an explanatory diagram of a portion of the marking mechanism shown in FIG. 5;

FIG. 7 is an operation explanatory view of the marking mechanism shown in FIG. 6;

FIG. 8 is a partial cross-sectional view of the marking mechanism in the use state of FIG. 7;

9 is a horizontal sectional view of the ink supply device shown in FIG.

FIG. 10 is a diagram illustrating the operation of the ink supply device of FIG. 9;

FIG. 11 is an explanatory diagram of an optical system of a lens meter according to a second embodiment of the present invention.

FIG. 12 is an explanatory diagram showing a use state of the optical system shown in FIG. 11;

FIG. 13 is an explanatory diagram showing a relationship with the focus light source of the mark point in FIG. 11;

FIG. 14 is an explanatory diagram of the pattern plate shown in FIG.

FIG. 15 is an explanatory diagram showing a relationship between a slit pattern formed by the pattern plate shown in FIG. 11 and a line sensor.

FIG. 16 is a schematic perspective view of a marking mechanism of a lens meter including the measurement optical system of FIG. 11;

FIG. 17 is an operation explanatory view of the marking mechanism of FIG. 16;

18A is a partial cross-sectional view of the marking mechanism shown in FIGS. 16 and 17, and FIG. 18B is a cross-sectional view taken along line AA of FIG.

FIG. 19 is an operation explanatory view of the lens meter having the configuration of FIGS. 11 to 18;

FIG. 20 is an explanatory diagram of an optical system of a lens meter according to a third embodiment of the present invention.

FIG. 21 is a schematic perspective view of a lens meter according to a fourth embodiment of the present invention.

22 (a) is an explanatory view of a lens mounting table of the lens meter of FIG. 21, (b) is a sectional view taken along line BB of (a), (c) is (b)
It is explanatory drawing which shows the modification of.

FIG. 23 (a) is a sectional view of a principal part of a lens meter according to a fifth embodiment of the present invention, and FIG. 23 (b) is a sectional view of a principal part of a lens meter according to a sixth embodiment of the present invention.

[Explanation of symbols]

 L: lens to be tested 21, 22, line sensor (light receiving means, light receiving sensor) 23: arithmetic control circuit (calculating means) 25: marking device (measuring means) 33: potentiometer (detecting means) 37 ... mark Point pin (marking needle, moving member) 45d: Reflecting surface 46a, 46b, 46c: LED (measuring light projecting means) 53: Lens height measuring means 54: Light source (measuring light projecting means) 55 ... line sensor (light receiving means, light receiving sensor) 60 ... height measuring means 61 ... potentiometer (detecting means) 62 ... measuring arm (moving member) 79 ... magnescale (detecting means) ) 80 ・ ・ ・ Measuring arm (moving member)

Claims (6)

[Claims] 1. A lens meter having an arithmetic unit for projecting a measurement light beam transmitted through a lens to be inspected to a light receiving unit and obtaining optical characteristics of the lens to be inspected based on an output signal from the light receiving unit. Measuring means for measuring the dimensions of the lens and outputting the dimension data, and wherein the calculating means is set so as to obtain the refractive index of the lens to be inspected from the dimension data and the optical characteristics. Lens meter. 2. The arithmetic unit according to claim 1, wherein the measuring unit includes at least three moving members that move up and down to contact an upper surface of the lens to be measured, and a detecting unit that detects a moving position of the moving member. 2. The lens meter according to claim 1, wherein the means is set so as to obtain surface shape data of the refraction surface of the lens to be inspected as the dimension data based on a detection signal from the detection means. 3. The lens meter according to claim 2, wherein the moving member is a marking needle which serves as a marking point for indicating an axial direction of the lens to be inspected. 4. The detecting means includes: a reflecting surface provided at an upper end of the moving member; a measuring light projecting means for projecting a measuring light beam on the reflecting surface; and a reflection of the measuring light beam reflected by the reflecting surface. The lens meter according to claim 2, further comprising a one-dimensional or two-dimensional light receiving sensor that receives light. 5. The lens meter according to claim 4, wherein a light receiving sensor for detecting a position of the moving member is common to a light receiving sensor for measuring an optical characteristic of the lens to be inspected. 6. The apparatus according to claim 1, wherein said calculating means obtains a refractive index and a material of the lens to be measured from the refractive power of the optical characteristics obtained from the light receiving means and the surface shape data. 5. The lens meter according to any one of 5.