JPH10104120A - Lens meter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable measurement of the whole region and only a narrow region of a glass lens by allowing a normal measurement mode for measuring only the narrow region and displaying a measured value and a wide measurement mode for measuring a wide region for mapping display to be changed over. SOLUTION: When a changeover switch 10 connected to a processing circuit 41 is turned on, a measurement light flux which has transmitted through a glass lens 31 transmits through a center pattern of a plate 26 of a lens receive 13 and a half mirror face 35a at the center of a beam splitter 35, so that only a center pattern image by the measurement light flux which has transmitted through a narrow region of the glass lens 35 is projected on a pickup element. The processing circuit 41 receives the center pattern image, and measures lens characteristics only in the narrow region for displaying 3. When the changeover switch 10 is turned off on the other hand, the measurement light flux passes through a peripheral pattern of the plate 26 and a total reflection mirror face 35b in the vicinity of the beam splitter 35, and numerous peripheral pattern images of the glass lens 31 are projected on an image pickup element 40. The processing circuit 41 receives the peripheral pattern images, and measures a wide region for mapping display.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a lens meter capable of mapping and displaying lens characteristics of a progressive lens as a spectacle lens.

[0002]

2. Description of the Related Art In recent years, a lens meter is provided with a light source for generating a measuring light beam, a progressive lens is set in a light projecting optical path of the measuring light beam, and a large number based on a transmitted measuring light beam transmitted through a wide area of the progressive lens. , A wide area is measured by receiving the pattern image, and the sphericity S (see FIG. 19A), the cylindrical degree C (see FIG. 19B), the axial angle A (see FIG. 19C), the prism An image display (mapping display) of the degree Prs (see FIG. 19D) has appeared.

[0003]

However, when measuring the spectacle lens, only a few narrow areas of the spectacle lens are measured, and each of the spherical, cylindrical, axial, and prismatic lenses of the spectacle lens is measured. Sometimes you want to determine the characteristic value, but using a lens meter dedicated to mapping display,
In order to obtain the lens characteristic values of only the desired narrow area of the spectacle lens such as sphericity, cylindrical degree, axial angle, and prism degree, it is necessary to calculate a large number of measured values obtained by measuring the wide area of the spectacle lens. Therefore, there is a problem that it takes time to obtain each lens characteristic value only in the desired narrow area, and it is difficult to quickly obtain each lens characteristic value only in the desired narrow area.

For example, when the spectacle lens is a spherical lens and an astigmatic lens, each lens characteristic value of the spherical lens can be determined by measuring a part of the spherical lens and the astigmatic lens. It is desirable to measure only the desired narrow range of the spectacle lens to measure the lens characteristics of the spectacle lens, such as sphericity, cylindrical degree, axis angle, and prism degree. There is a problem that measurement takes too long with a lens meter.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a lens meter capable of performing both narrow-range measurement and full-range measurement of a spectacle lens. is there.

[0006]

According to a first aspect of the present invention, there is provided a lens meter including a light source for generating a measurement light beam, and a central pattern for measuring a narrow-range characteristic of a spectacle lens in a light projecting optical path of the measurement light beam. A pattern forming plate having a large number of peripheral patterns for measuring the wide area characteristics of the spectacle lens is provided, receives a central pattern image based on a transmission measurement light beam transmitted through a narrow area of the spectacle lens, and measures only the narrow area. Switchable between a normal measurement mode for displaying measured values and a wide-area measurement mode for receiving a large number of peripheral pattern images based on a transmission measurement light beam transmitted through a wide area of the spectacle lens and measuring a wide area to perform mapping display It is.

According to a second aspect of the present invention, in the lens meter according to the first aspect, the light source has a wavelength distribution characteristic or a plurality of wavelengths, and receives a pattern image based on the transmission measurement light beam. An image receiving optical path is branched into one image receiving optical path for receiving the central pattern image and the other image receiving optical path for receiving a large number of pattern images based on the transmission measurement light flux. A beam splitter that transmits a part of the light beam and reflects the rest is provided.

According to a third aspect of the present invention, in the lens meter according to the second aspect, an enlargement optical system for enlarging the central pattern image is provided in the one image receiving optical path.

According to a fourth aspect of the present invention, there is provided a lens meter according to the first aspect, wherein the light sources include two light sources that generate measurement light beams having different wavelengths from each other, and one of the light sources is a normal measurement light source. Used in the mode, the other light source is used in the wide-area measurement mode, the central pattern has an optical wavelength characteristic of transmitting at least the measurement light flux generated from the one light source, and the peripheral pattern is from the other light source. It has an optical wavelength characteristic of transmitting only the generated measurement light beam.

A lens meter according to a fifth aspect of the present invention is the lens meter according to the first aspect, wherein a lens receiver for a spectacle lens set is provided in the light projecting optical path, and the lens receiver is a plate plate and the spectacles. A lens receiving cylinder for receiving a lens, wherein an auxiliary lens receiving cylinder is mounted on the lens receiving cylinder in a normal measurement mode.

According to a sixth aspect of the present invention, in the lens meter according to the fifth aspect, the auxiliary lens receptacle is a lens receptacle that transmits a transmission measurement light beam that contributes to the formation of the central pattern image. And a pedestal section for shielding the transmission measurement light beam contributing to the formation of the peripheral pattern image.

According to a seventh aspect of the present invention, there is provided a lens meter according to the sixth aspect, wherein the lens receiving cylinder is provided with an auxiliary lens having a minus power. According to an eighth aspect of the present invention, there is provided a lens meter according to any one of the fifth to seventh aspects, wherein the height of the auxiliary lens receiving cylinder from the plate plate is equal to that of the lens receiver. It is characterized by being higher than the height of the cylinder from the plate.

According to a ninth aspect of the present invention, in the lens meter according to the fifth or sixth aspect, one of the auxiliary lens receiving cylinder and the lens receiver is provided with the auxiliary lens receiving part. Switching means is provided for automatically switching from the wide-area measurement mode to the normal measurement mode when the tube is mounted on the lens receiver.

According to a tenth aspect of the present invention, there is provided a lens meter according to the first aspect, wherein a lens cylinder for a normal measurement mode and a lens cylinder for a wide area measurement mode are prepared. The height from the plate plate of the lens receiving cylinder to the top of the lens receiving cylinder is larger than the height from the plate plate of the lens receiving cylinder for the wide area measurement mode to the top of the lens receiving cylinder.

BEST MODE FOR CARRYING OUT THE INVENTION

[0015]

Embodiment 1 FIG. 1 is an external view of a lens meter according to the present invention. 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 an upper part of the main body 2,
3a is a display screen of the monitor 3, 4 is an upper optical component storage section provided on the front side of the main body 2, 5 is a lower optical component storage section provided below the upper optical component storage section, and 6 is a lower optical component storage section. A lens receiving table 7 provided at the upper end of the optical component storage unit 5, a lens pad 7 positioned between the storage units 5 and 6 and held at the front of the main body 2 so as to be adjustable in the front-rear direction, and 8 at the side of the main body 2 A lens contact operation lever which is held on the side so as to be able to rotate back and forth, and the lens cover 7 is adjusted to move back and forth by turning the lever 8 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. Reference numeral 10 denotes a mode changeover switch, and 11 denotes a measurement start switch.

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. In this lens receiver 13, a circular unprocessed lens (fabric lens) and a spectacle lens framed in a spectacle frame are set.

A measuring optical system shown in FIG. 2 is provided in the main body 2. In FIG. 2, reference numeral 20 denotes a light projecting means, and the light projecting means 20 includes a light source 21 for generating a measurement light beam, a pinhole plate 22, and a collimating lens 23. 22a is a pinhole. The light source 21 has a wavelength distribution characteristic or a plurality of wavelengths. The pinhole plate 22 is a collimating lens 23
The collimating lens 23 is located at the focal position of
It serves to convert the measurement light beam emitted from 1 into a parallel light beam P. A reflection mirror 25 is provided in the middle of the light path 24 of the parallel light flux P and above the lens receiving table 6.

The lens receiver 13 mounted on the lens receiver table 6 is composed of a plate plate 26 and a lens receiving cylinder 27. The plate 13 has a rectangular shape as shown in FIG. 3 and is locked in the stepped mounting hole 12 of the lens receiving table 6. The lens receiving cylinder 27 is made of metal. An annular groove 26a for mounting the lens receiver is formed in the center of the plate plate 26. The lens receiving cylinder 27 is provided with a transparent cover glass 27a for dust prevention. The lens receiving cylinder 27 can be attached to and detached from the plate plate 26, and a lens receiving cylinder 27 ′ a taller than the lens receiving cylinder 27 can be mounted on the plate plate 26.

A central pattern 28 is formed on the inside of the plate 26 surrounded by an annular groove 26a. This central pattern 28 is formed from four slit holes 28a to 28d. The central pattern 28 has a square shape as a whole due to the slit holes 28a to 28d. The respective edges of the slit holes 28a to 28d are separated from each other.

On the plate 26, peripheral patterns 29 are formed at regular intervals outside the annular groove 26a. The peripheral pattern 29 is formed of a circular hole, and the central pattern 28 and the peripheral pattern 29 have different pattern shapes. The remaining portion of the plate 26 is the light shielding portion 3
0, and the plate plate 26 has a function as a pattern forming plate.

Here, it is assumed that an unprocessed lens having negative power is set as the spectacle lens 31 in the lens receiver 13. A screen 32 is provided on the light projecting optical path 24 at a predetermined distance from the spectacle lens 31. The screen 32 is made of, for example, a diffusion plate.

When the spectacle lens 31 is not set in the light projecting optical path 24, the measurement light beam is guided to the plate plate 26 as a parallel light beam P and passes through each pattern of the plate plate 26. The pattern corresponding to the plate 26 is projected on the screen 35 as shown in FIG. In FIG. 4, reference numeral 33 denotes a central pattern image on the screen 32 corresponding to the central pattern 28, and reference numeral 34 denotes a peripheral pattern image on the screen 32 corresponding to the peripheral pattern 29.

When the spectacle lens 31 is set in the light projecting optical path 24, the wide area S1 of the spectacle lens 31 is irradiated with the parallel light flux P. The parallel light flux P is the spectacle lens 3
The pattern is diffused by being deformed by the negative power of 1, and a pattern with a wide interval is projected on the screen 32 as shown in FIG. When a spectacle lens (not shown) having a positive power is set in the light projecting optical path 24, its parallel light flux P
Are deformed and converged by the positive power of the spectacle lens, and a pattern with a narrow interval is projected on the screen 32 as shown in FIG.

A beam splitter 35 is provided in the light projecting optical path 24 behind the screen 32. The center of the beam splitter 35 is a half mirror surface 35a, and the periphery thereof is a total reflection mirror surface 35b. The light projecting optical path 24 is branched by a beam splitter 35 into one image receiving optical path 24a for receiving the central pattern image 33 and the other image receiving optical path 24b for receiving the peripheral pattern image 34.

An image forming lens 36 and an image pickup device 37 are provided in the image receiving optical path 24a. The imaging element 37 is provided at a position conjugate with the screen 32 with respect to the imaging lens 36. In the image receiving optical path 24b, a total reflection mirror 38, an imaging lens 39, and an image pickup device 40 are provided. The imaging device 40 is connected to the screen 3 with respect to the imaging lens 39.
2 and provided at a conjugate position.

Only the central pattern image 33 is formed on the image sensor 37 via the half mirror surface 35a.
At 0, the peripheral pattern image 34 is formed based on the reflection by the total reflection mirror surface 35b. Since only the central pattern image is formed on the image sensor 37, if an enlargement optical system is used as the imaging lens 36, as shown in FIG.
The central pattern image 33 can be enlarged and projected on the imaging surface 37a of the camera, and therefore, the analysis accuracy of the central pattern image 33 can be improved. On the other hand, the entire peripheral pattern image 34 is projected on the imaging surface 40a of the imaging element 40, as shown in FIG.

The image sensor 37 and the image sensor 40 are connected to a processing circuit 41. The processing circuit 41 receives a central pattern image 33 based on a transmission measurement light beam transmitted through a narrow area of the spectacle lens 31 and measures only the narrow area to display a measured value. Peripheral pattern images 34 based on the transmission measurement light beam transmitted through
And a wide-area measurement mode for measuring the wide area and performing mapping display. The changeover switch 10 is connected to the processing circuit 41, and the changeover switch 10
The normal measurement mode in which the central pattern image 33 based on the transmission measurement light beam transmitted through the narrow area of the spectacle lens 31 is received and the measurement value is displayed by measuring only the narrow area, and the transmission measurement light beam transmitted through the wide area of the eyeglass lens 31 Has a function of receiving a large number of peripheral pattern images 34 based on the above, and switching between a wide area measurement mode in which a wide area is measured and mapping display is performed.

For example, when the changeover switch 10 is turned on,
A normal measurement mode in which the processing circuit 41 receives the central pattern image 33 based on the transmission measurement light beam transmitted through the narrow area of the spectacle lens 31 and measures only the narrow area to display a measured value;
Based on only the central pattern image 33, the spherical power, the cylindrical power, the axial angle, and the prism power as the lens characteristics are calculated, and the result is displayed as a numerical value as a display screen 3a of the monitor 3.
Will be displayed. In the normal measurement mode, since the lens characteristics are measured and calculated based on only the central pattern image 33, the processing speed is high. When the changeover switch 10 is turned off, for example, the processing circuit 41 enters a wide area measurement mode in which a large number of peripheral pattern images 34 based on the transmission measurement light beam transmitted through the wide area of the spectacle lens 31 are received, the wide area is measured, and the mapping display is performed. The power distribution based on the lens characteristics at each point in the wide area is calculated, and the spherical power, the cylindrical power, the axis angle, and the prism power are displayed on the display screen 3a of the monitor 3. When the measurement is performed in the wide area measurement mode, the data of the central portion of the spectacle lens 31 can also be measured using the central pattern image 33.

In the normal measurement mode, the spectacle lens 31 may be moved with the spectacle lens 31 placed on the lens receiving tube 27 in order to measure only a desired narrow area of the spectacle lens 31.
If the edge of the spectacle lens 31 comes into contact with the plate plate 26 or the lens receiving table 6 when it is moved while being placed on the lens receiving cylinder 27, and it is difficult to perform the measurement, the lens receiving The cylinder 27 is connected to the plate 26
, And replace it with the lens receiving cylinder 27 'for measurement. Although the mirror is used as the beam splitter 35 in the first embodiment of the present invention, a similar function may be provided by using a dichroic prism.

[0031]

Embodiment 2 In FIG. 9, 42 and 43 are LEDs as light sources, 44 and 45 are pinhole plates, 44a and 45
b is a pinhole and 46 is a beam splitter. Here, the LED 42 generates a measurement light beam having a wavelength of 550 nm, the LED 43 generates a measurement light beam having a wavelength of 660 nm, and the wavelengths of the measurement light beams of the two LEDs are different from each other. The beam splitter 46 is formed with a dichroic mirror surface 46a that transmits the measurement light beam having the wavelength of 550 nm and reflects the measurement light beam having the wavelength of 650 nm. To be converted into a parallel light beam.

In the second embodiment of the present invention, as shown in FIG. 10, the plate 26 has a central pattern 28 'for transmitting a measurement light beam having a wavelength of 550 nm or more (see a transmittance curve indicated by a symbol T1 in FIG. 11). And a peripheral pattern 29 ′ (see a transmittance curve indicated by a symbol T <b> 2 in FIG. 11) that transmits a measurement light beam having a wavelength of 660 nm or more, and a light shielding portion 26 b.

In the second embodiment of the present invention, there is only one image sensor, and this image sensor is indicated by reference numeral 37. According to this, for example, when the changeover switch 10 is turned on, the processing circuit 41 enters the normal measurement mode, whereby the LED 42 is driven, only the central pattern 28 ′ is projected on the screen 32, and the narrow area of the spectacle lens 31 is Only the central pattern image based on the transmission measurement light beam transmitted through is received by the image sensor 37. When the changeover switch 10 is turned off, the processing circuit 41 enters the wide-area measurement mode, whereby the LED 43 is driven, and the peripheral pattern 29 ′ is projected on the screen 32, based on the transmitted measurement light flux transmitted through the wide area of the spectacle lens 31. The peripheral pattern image is captured by the image sensor 37
Is received. Note that the central pattern 28 'may have a transparent characteristic with a transmittance of 100% in the entire wavelength region as shown by a symbol T3 in FIG.

[0034]

Third Embodiment FIGS. 12 to 15 are explanatory diagrams of a fourth embodiment according to the present invention. This FIG. 12 to FIG.
In the following, the same components as those in the first embodiment of the invention will be denoted by the same reference numerals, and detailed description thereof will be omitted. Only different portions will be described.

Here, the auxiliary lens receiving cylinder 46 is mounted on the lens receiving cylinder 27. The auxiliary lens receiving cylinder 46 includes a seat 46a and a lens receiving cylinder 46b. A micro switch 47 is provided on the lens receiving table 6. An auxiliary lens 48 is provided in the lens receiving cylinder 46b. Micro switch 4
7 is provided with a connector (not shown), and the microswitch 47 is connected to the processing circuit 41 by the connector. Reference numeral 49 denotes an operating piece of the micro switch 47. The micro switch 47 has a function of automatically switching the mode between the normal measurement mode and the wide area measurement mode when the auxiliary lens receiving cylinder 46 is placed on the lens receiving table 6.

The reason for providing the auxiliary lens 48 is as follows. When the spectacle lens 31 is a progressive focus lens, its measurement range (dynamic range) is required to be in a range from +15 diopter to -15 diopter. In the case of a commercially available lens meter that measures only the narrow range of the spectacle lens 31, a range from +25 diopter to −25 diopter is required as a measurement range (dynamic range). Therefore, when the spectacle lens 31 is a progressive lens, as shown in FIG.
The back focus f1 is a minimum of about 66.67 mm. On the other hand, in the case of a commercially available lens meter, the spectacle lens 3
1 has a minimum back focus f2 of 40 mm. Here, the distance from the plate 6 to the screen 32 is L1.
And the height from the plate plate 6 to the top of the lens receiving cylinder 27 is L2 (f2 = L2 + L1), and the screen 3
When 2 is closer to the plate 26 than L1, the displacement S of the measurement light beam on the screen 32 is reduced. Also,
Conversely, when the screen 32 is moved farther away from the plate plate 26 than L1 and approaches the point Q of the back focus f1, when the spectacle lens 31 with the back focus of 40 mm is measured in the normal measurement mode, the spectacle lens 31 has a positive power. In this case, the measurement light flux crosses, and the measurement cannot be performed. Therefore, the height L2 from the plate 26 to the top of the lens receiving cylinder 27 is about 10 mm, and the distance L1 from the plate 26 to the screen 32 is 30 mm.
Set to. When the distance L1 from the plate plate 26 to the screen 32 is set as described above, the measurement sensitivity is good, and the measurement can be performed without any problem in all the measurement ranges in the normal measurement mode and the wide-area measurement mode. It can be carried out.

However, in the normal measurement mode, in order to measure only a desired narrow area of the spectacle lens 31, the spectacle lens 31 may be moved with the spectacle lens 31 mounted on the lens receiving cylinder 27 as described above. , This lens receiving cylinder 2
When the spectacle lens 31 is moved while being placed on 7,
The edge 31a of the spectacle lens 31 may come into contact with the lens receiving table 6 or the plate plate 26 as shown by a dashed line in FIG. Therefore, the height of the auxiliary lens receiving cylinder 46 from the plate 26 is designed to be higher than the height of the lens receiving cylinder 27 from the plate 26. For example, as shown in FIG. The height L3 from the plate plate 26 when the tube 46 is mounted to the top of the lens receiving tube 46b is set to about 20 mm.

As described above, when the height L3 when the auxiliary lens receiving cylinder 46 is mounted on the lens receiving cylinder 27 is set to about 20 mm, when measuring only a desired narrow area of the spectacle lens 31 in the normal measurement mode, Even if the spectacle lens 31 is moved while being placed on the lens receiving cylinder 27, the spectacle lens 3
Since the one edge 31a does not abut on the plate plate 26 or the lens receiving table 6, it is possible to measure a desired narrow-range lens characteristic of the spectacle lens 31 without any trouble.

However, if the height from the plate 26 of the auxiliary lens receiving cylinder 46 or the lens receiving table 6 to the lens receiving cylinder 46b is simply increased, the lens receiving cylinder 46b
Is longer than the minimum back focus distance f2, and the spectacle lens 31 with the minimum back focus distance f2 cannot be measured. Therefore, a minus power (negative power) is used for the auxiliary lens 48, so that the back focus distance is corrected to be extended.

In the third embodiment of the present invention, the number of the image pickup devices is two and the auxiliary lens receiving cylinder 46 is made of a transparent material.
The base portion 46a of the auxiliary lens receiving cylinder 46, so that the measurement light beam passes only through the inside, and the remaining portion does not pass the measurement light beam.
If a light-shielding film is formed on the outer periphery of the lens receiving cylinder 46b, the measurement in the normal measurement mode and the wide-area measurement mode can be performed by one image sensor as in the second embodiment. When the auxiliary lens receiving cylinder 46 is mounted on the lens receiving table 6, the processing circuit 41 is automatically switched from the wide-area measurement mode to the normal measurement mode by the microswitch 47.

According to the present invention, a spectacle lens framed in a spectacle frame can also be measured, and FIG. 16 shows an example of measuring a spectacle lens framed in a frame. It has a rectangular shape corresponding to the shape of the plate 26. In FIG. 16, (A) shows the spherical degree S, (B) shows the cylindrical degree C, (C) shows the axial angle A, and (D) shows the prism degree Pr, which is a measurement that can cover the range necessary for the spectacle lens 31. Range.

As shown in FIG. 16E, for example, the measured values of the sphericity S, the cylindricity C, the axis angle A, and the prism amount Pr are also displayed simultaneously with the mapping display of the cylindricity C. Can also. Further, as shown in FIG. 16F, it is possible to simultaneously display the image of the left-eye (L) spectacle lens and the image of the right-eye (R) spectacle lens. Make the image correspond to the other image,
It is also possible to reverse the display, and with such a configuration, it is easy to know the layout of the spectacle lens in a state where the spectacle lens is framed in the spectacle frame. Note that by superimposing and displaying one inverted image and the other image that is not inverted, the lens characteristics of the left-eye spectacle lens and the right-eye spectacle lens may be compared. Further, the left-eye spectacle lens and the right-eye spectacle lens may be displayed side by side.

[0043]

Embodiment 4 FIGS. 17 and 18 show a contact lens 4.
FIG. 17 is an explanatory view for explaining an embodiment in the case of measuring 9, and FIG. 17 shows a configuration in which a lens container 50 is set in an auxiliary lens receiving cylinder 46. This lens container 5
Reference numeral 0 denotes a container body 51, a contact lens mounting portion 52, a cover glass 53 for sealing, and a cover plate 54. The container body 51 is filled with physiological saline. FIG. 18 shows a configuration in which the lens container 50 includes a container body 56 with a seat 55, a contact lens mounting portion 57, a cover glass 58 for sealing, and a cover plate 59, and is mounted on the plate plate 26. In FIGS. 3 and 10, diagonal lines are hatched, and indicate the light shielding portions 30.

[0044]

Since the lens meter according to the first aspect of the present invention is constructed as described above, it is possible to measure only the narrow area of the spectacle lens and quickly display the measured value of the spectacle lens, There is an effect that mapping display can be performed by measuring a wide area of the lens.

[Brief description of the drawings]

FIG. 1 is an external view of a lens meter according to the present invention.

FIG. 2 is an optical diagram showing Embodiment 1 of the lens meter according to the present invention.

FIG. 3 is a plan view of the plate plate shown in FIG. 2;

FIG. 4 is a diagram showing a pattern image projected on a screen when the spectacle lens is not set in a projection optical path.

FIG. 5 is a diagram illustrating an example of a pattern image projected on a screen when a spectacle lens having a negative power is set in a projection optical path.

FIG. 6 is a diagram showing an example of a pattern image projected on a screen when a spectacle lens having a positive power is set in a light projection optical path.

FIG. 7 is a diagram illustrating a state where only a central pattern image is enlarged and formed on the image sensor illustrated in FIG. 2;

FIG. 8 is a diagram showing a state in which a large number of peripheral pattern images are formed on the image sensor shown in FIG. 2;

FIG. 9 is an optical diagram of a lens meter according to a second embodiment of the present invention.

FIG. 10 is a plan view of the plate plate shown in FIG. 9;

FIG. 11 is a transmittance curve diagram showing transmission characteristics of each pattern formed on the pattern forming plate shown in FIG.

FIG. 12 is an optical diagram of a lens meter according to a third embodiment of the present invention.

FIG. 13 is an explanatory diagram for explaining an arrangement relationship between a plate plate and a screen shown in FIG. 12;

14 is an explanatory diagram for explaining an arrangement relationship between the plate plate and the screen shown in FIG. 12, showing a state where the edge surface of the spectacle lens is in contact with the lens receiving table when the spectacle lens is moved. Is shown.

FIG. 15 is an optical diagram of a lens meter according to a third embodiment of the present invention, showing a state where an auxiliary lens receiving cylinder is mounted on a lens receiver.

FIG. 16 shows an example of a mapping diagram of each lens characteristic value of an eyeglass lens, wherein (a) is a spherical degree distribution, (b) is a cylindrical degree distribution, (c) is an axial angle distribution, and (d) is a prism degree distribution. (E) shows a state in which the measured values are displayed together with the cylindrical degree distribution, and (f) shows both the cylindrical degree distribution of the left-eye spectacle lens and the right-eye spectacle lens, and displays one image. This shows a state where the display is inverted.

FIG. 17 is an explanatory diagram for explaining an embodiment in the case of measuring a contact lens, in which a lens container is placed in an auxiliary lens receiving cylinder.

FIG. 18 is an explanatory diagram for explaining another embodiment when measuring a contact lens, and is an explanatory diagram for a case where a lens container is directly mounted on a lens receiving cylinder.

FIG. 19 shows an example of a mapping diagram of each lens characteristic value of the spectacle lens, (A) shows a sphericity distribution, (B) shows a cylindrical degree distribution, (C) shows an axial angle distribution, D)
Indicates a prism degree distribution.

[Explanation of symbols]

 Reference Signs List 21 light source 24 projecting light path 26 plate plate (pattern forming plate) 31 eyeglass lens 28 central pattern 29 peripheral pattern 33 peripheral pattern image 41 peripheral pattern image 41 processing circuit P measuring beam S1 wide area

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Takeyuki Kato 75-1 Hasunumacho, Itabashi-ku, Tokyo Inside Topcon Co., Ltd.

Claims (10)

[Claims] 1. A pattern forming apparatus comprising: a light source for generating a measurement light beam; and a pattern having a central pattern for measuring a narrow area characteristic of the spectacle lens and a number of peripheral patterns for measuring a wide area characteristic of the eyeglass lens in a projection optical path of the measurement light beam. A plate is provided, a normal measurement mode in which a central pattern image based on a transmission measurement light beam transmitted through a narrow area of the spectacle lens is received, and a measurement value is displayed by measuring only the narrow area, and transmitted through a wide area of the spectacle lens. A lens meter capable of receiving a large number of peripheral pattern images based on a transmitted measurement light beam and measuring a wide area to perform a mapping display. 2. The image forming apparatus according to claim 1, wherein the light source has a wavelength distribution characteristic or a plurality of wavelength characteristics, and an image receiving optical path for receiving a pattern image based on the transmission measurement light beam includes one image receiving optical path for receiving the central pattern image; A beam splitter that is branched into the other image-receiving optical path that receives a large number of pattern images based on the light beam, and a beam splitter that transmits a part of the transmission measurement light beam and reflects the rest is provided at a branch portion of the image-receiving light path. Item 2. The lens meter according to item 1. 3. The magnifying optical system for enlarging the central pattern image is provided in the one image receiving optical path.
The lens meter described in. 4. The light source includes two light sources that generate measurement light beams having different wavelengths from each other, one light source is used in a normal measurement mode, the other light source is used in a wide-area measurement mode, and the central pattern is Having an optical wavelength characteristic of transmitting at least the measurement light flux generated from the one light source,
The lens meter according to claim 1, wherein the peripheral pattern has an optical wavelength characteristic that transmits only a measurement light beam generated from the other light source. 5. A lens receiver for a spectacle lens set is provided in the light projection optical path, the lens receiver having a plate plate and a lens receiving cylinder for receiving the spectacle lens, wherein the lens receiver is in a normal measurement mode. The lens meter according to claim 1, wherein an auxiliary lens receiving cylinder is mounted on the cylinder. 6. The lens barrel for transmitting a transmission measurement light beam contributing to the formation of the central pattern image, and a seat portion for blocking the transmission measurement light beam for contributing to the formation of the peripheral pattern image. The lens meter according to claim 5, comprising: 7. The lens meter according to claim 6, wherein an auxiliary lens having a minus power is provided in the lens receiving cylinder. 8. The apparatus according to claim 5, wherein the height of the auxiliary lens receiving cylinder from the plate is higher than the height of the lens receiving cylinder from the plate.
The lens meter according to claim 7. 9. When one of the auxiliary lens receiving cylinder and the lens receiver is attached to the lens receiving part, the auxiliary lens receiving cylinder automatically switches from the wide-area measurement mode to the normal measurement mode. 7. The lens meter according to claim 5, wherein a switching means for switching is provided. 10. A lens cylinder for a normal measurement mode and a lens cylinder for a wide-area measurement mode are prepared, and the height from the plate plate of the lens cylinder for the normal measurement mode to the top of the lens cylinder is adjusted. The lens meter according to claim 1, wherein the height is greater than a height from a plate plate of the lens barrel for the wide area measurement mode to a top of the lens barrel.