KR20060053200A - Measuring apparatus for the lens of the glasses - Google Patents

Abstract

An object of the present invention is to provide a spectacle lens measuring apparatus that can clearly indicate the difference in ultraviolet transmittance of the spectacle lens.

More specifically, the spectacle lens measuring apparatus of the present invention has a first light source, has a first light optical system for transmitting the first light of the ultraviolet region for ultraviolet transmittance measurement to the lens to be measured, and a first light receiving element. A first light receiving optical system for receiving the first light passing through the lens from the first light receiving element, a calculation unit for calculating the ultraviolet light transmittance of the target lens based on the output of the first light receiving element, a display, and the ultraviolet light transmittance of the first target lens And a control unit for displaying the ultraviolet transmittance of the second target lens to be comparably displayed on the same screen as the display.

Description

Measuring Apparatus for the lens of the glasses}

1 is a schematic external view of a spectacle lens measuring apparatus according to an embodiment of the present invention.

2 is a schematic configuration diagram of an optical system and a control system of the spectacle lens measuring apparatus.

Figure 3 shows the arrangement (distribution) pattern of the indicator formed on the indicator plate.

4 is an example of a display screen of measurement results of ultraviolet ray transmittance of a lens.

5 is a display screen example of measurement results of ultraviolet transmittances of two different lenses.

6 is an example of a display screen of measurement results of ultraviolet transmittance of three different lenses.

7 is a schematic configuration diagram of an optical system and a control system of a UV meter for measuring ultraviolet transmittance.

The present invention relates to a spectacle lens measuring apparatus for measuring the ultraviolet transmittance of the spectacle lens.

In recent years, there has been a growing demand for spectacle lenses (hereinafter referred to as "UV blocking lenses") that have characteristics that suppress the transmission of ultraviolet rays to protect the eyes from ultraviolet rays. For this reason, an optician who handles spectacle lenses or the like uses an ultraviolet transmittance measuring device (hereinafter referred to as an "UV meter"), a lens meter equipped with an ultraviolet transmittance measuring function, or the like. Ultraviolet transmittance is measured, and when UV transmittance is high, it is recommended to use a UV blocking lens with a low UV transmittance.

However, the conventional UV meter, lens meter and the like merely display the measurement result of the UV transmittance for each lens measured on the display. For this reason, even if the difference between the ultraviolet ray transmittance of the old spectacle lens and the ultraviolet ray transmittance of the UV blocking lens is to be shown to the customer, each measurement result is displayed separately, making it difficult for the customer to know the difference between the two.

An object of the present invention is to provide a spectacle lens measuring apparatus that can clearly indicate the difference in ultraviolet transmittance of the spectacle lens.

 (1) In order to solve the said subject, the spectacle lens measuring apparatus of this invention has a 1st light optical system which has a 1st light source, and transmits the 1st light of the ultraviolet region for ultraviolet transmittance measurement to a measurement object lens, and a 1st A first light receiving optical system having a light receiving element and receiving the first light transmitted through the object lens from the first light receiving element, an arithmetic unit for obtaining an ultraviolet transmittance of the target lens based on the output of the first light receiving element, a display, And a control unit for displaying the ultraviolet transmittance of the first target lens and the ultraviolet transmittance of the second target lens to be comparably displayed on the same screen as the display.

(2) As the measuring apparatus for the spectacle lens of the above (1), preferably, the calculation unit applies the obtained ultraviolet transmittance to the corresponding levels of the plurality of ultraviolet transmittance levels.

(3) The spectacle lens measuring apparatus of (2), wherein the control unit preferably displays the ultraviolet ray transmitting level of the first target lens and the ultraviolet ray transmitting level of the second target lens on the same screen of the display.

(4) The spectroscopic lens measuring apparatus (1) has, in particular, a second light source having a second light source, a second light transmitting optical system for transmitting a second light for refractive index measurement, and a second light receiving element. And a second light receiving optical system for receiving from the second light receiving element for transmitting the second light passing through the lens, and a mode switching means for switching the refractive power measurement mode and the UV transmittance measurement mode, wherein the calculating unit outputs the second light receiving element. The refractive power of the target lens is obtained based on the above, and the control unit switches the screen of the display based on the switching of the measurement mode by the mode switching means.

(5) The spectacle lens measuring apparatus of (4), wherein the first and second light transmitting optical systems preferably have a common light transmitting lens, and the first and second light receiving optical systems have a common measuring indicator plate. The first light receiving element and the second light receiving element are used in common.

EXAMPLE

An embodiment of the present invention will be described with reference to the drawings. 1 is a schematic external view of a spectacle lens measuring apparatus according to an embodiment of the present invention. 2 is a schematic configuration diagram of an optical system and a control system of the spectacle lens measuring apparatus.

On the display 2 of the LCD or the like provided on the upper part of the main body 1 of the lens meter with the UV transmittance measuring function as the spectacle lens measuring device, information necessary for measuring the refraction power of the alignment target mark and the like is displayed. When the switch 3 corresponding to the switch display displayed on the display 2 is pressed, necessary input instructions such as switching of the measurement mode are made.

The lens to be measured LE is placed on the nose piece (lens pedestal) 4. The lens LE placed on the nose piece 4 is stably held by lowering the lens press 5 to the lower side (the nose piece 4 side).

When measuring the lens LE placed on the spectacle frame, contact the frame guard (lens guard) 6 that is movable in the front-rear direction (arrow A direction) to the lower end of the left and right lens frame (or the left and right lens). To stabilize it. A seal mechanism 7 is used to point to a lens point on the lens LE. The power switch 9 is a switch for turning on the power of the apparatus.

The READ switch 8 is a switch for sending a storage instruction signal of the measurement result of the lens LE. When the switch 8 is briefly pressed, the measurement of the refractive power of the lens LE is started, and the measured value is displayed on the display 2 and stored in the memory 42 inside the apparatus. When the switch 8 is pressed for longer than 1 second, the measurement of the ultraviolet transmittance of the lens LE is started, and the measured value is displayed on the display 2 and stored in the memory 42. The display 2 is usually a screen display for measuring the refractive power, but when the ultraviolet transmittance is measured (or switched from the refractive power measurement mode to the ultraviolet transmittance measuring mode), the display 2 is switched to the screen display for measuring the ultraviolet transmittance. It is supposed to be.

10 is a measurement optical system for measuring the refractive power of the lens LE, and L1 is the measurement optical axis. The measuring optical system 10 is disposed on the optical axis L1, and has a light source plate 11 for refracting power measurement such as an LED that emits visible light, a collimating lens (light transmitting lens) 12, a mirror 13, and an index for measuring the refractive power measurement. 14 and a secondary light receiving sensor (image sensor) 15 capable of detecting light in a wavelength range from visible to ultraviolet. The optical axis L1 passes through the center of the opening 4a of the nose piece 4 and is perpendicular to the opening plane of the opening 4a. The indicator plate 14 is held by the holding member 16 of the main body 1, and is disposed just below the opening 4a. The opening 4a is circular with a diameter of about 8 mm.

3 shows the arrangement (distribution) pattern of the indicators formed on the indicator plate 14. The indicator plate 14 is circular with an outer diameter slightly larger than the inner diameter of the opening 4a, and a plurality of indicators 20 are formed. The index 20 of the present embodiment is a circular large hole having a diameter of about 0.4 mm, which is a central index 21 disposed at a central position through which the optical axis L1 passes, and a peripheral index arranged in a lattice shape at about 0.5 mm intervals around the index. 22 is a circular small hole 22 having a diameter of about 0.2 mm. The number of the indicators 20 is about 200, and is arranged in the range of about 7 mm in diameter centering on the optical axis L1.

The measurement light flux of the visible light from the light source 11 becomes a parallel light flux by the collimation lens 12, is reflected by the mirror 13, and is projected onto the lens LE positioned on the optical axis L1 placed on the nose piece 4. Of the measurement light beams passing through the lens LE, the measurement light beams passing through the opening 4a and passing through the indicator (hole) 21 and the indicator (hole) 22 are incident on the light receiving sensor 15.

The output signal from the light receiving sensor 15 is input to the calculation control unit 40. The arithmetic and control unit 40 stores the position (coordinates) of each index shape detected by the light receiving sensor 15 in the reference state in which the lens LE is not placed on the nose piece 4 and is not located on the optical axis L1, which is stored in the memory 42 when the device is powered on. The lens LE having a refractive power with respect to the excitation force is placed on the nose piece 4 and the change in the position (coordinate) of each indicator shape detected by the light receiving sensor 15 in the measurement state positioned on the optical axis L1. Optical properties (spherical power, principal power, principal axis angle, prism power) are obtained. For example, in the state where the lens LE having only spherical power is positioned on the optical axis L1, the position of each index shape is enlarged or reduced from the optical center of the lens LE to a circular shape with respect to the state where the lens LE is not located. Spherical power is calculated | required based on this enlargement amount or reduction amount. In addition, in a state in which the lens LE having only the main surface power is positioned on the optical axis L1, the position of each index shape is expanded or reduced from the center of the axis LE of the lens LE to an ellipse with respect to the state in which the lens LE is not located. do. Based on this enlargement amount or reduction amount, the principal surface frequency and the principal axis angle are obtained (see US 3,880,525 (see Japanese Patent Application Laid-Open No. 50-145249)).

In addition, the arithmetic and control unit 40 sets the optical characteristics such as the refractive index of the lens LE as four sets of adjacent (2x2) (at least three) index shapes from the average of the change in the position of each index shape of each pair. You can get it. Therefore, according to the structure of this apparatus, each optical characteristic of the several measurement position (measurement point) in the measurement area of the lens LE corresponding to inside of opening 4a is acquired at once. That is, distribution of the optical characteristic in a measurement area is obtained. For this reason, in the progressive lens, it is possible to determine efficiently whether or not at least a part of the current measurement position is in the original part (whether or not there is a part of the original part in the current measurement area). In the same way, whether at least a part of the current measurement position is in the proximal region (with or without a part of the proximal region in the current measurement region), or whether at least a portion of the current measurement position is in the progressive zone (within the current measurement region Can be determined efficiently).

In the vicinity of the light source 10 (a position away from the optical axis L1), a light source 30 for measuring ultraviolet transmittance such as an LED that emits ultraviolet light (center wavelength 365 nm) is disposed. The measuring optical system for measuring the ultraviolet transmittance of the lens LE shares the collimation lens 12 to the light receiving sensor 15 of the measuring optical system 10 for measuring the refractive power. The measurement light beam of ultraviolet light from the light source 30 enters the light receiving sensor 15 through the collimation lens 12, the mirror 13, and the indicator plate 14, similar to the measurement light beam from the light source 11.

The output signal from the light receiving sensor 15 is input to the calculation control unit 40. The calculation control section 40 is based on the amount of light received by the light receiving sensor 15 in the reference state in which the lens LE is not placed on the nose piece 4 and is not positioned on the optical axis L1, with the lens LE placed on the nose piece 4 and the optical axis L1. From the change in the amount of light received by the light receiving sensor in the measurement state located above, the ultraviolet transmittance of the lens LE is obtained. Then, it is determined where the UV transmittance belongs to the UV transmittance level 1 to the UV transmittance level 4 classified in order from the lower one. The UV transmission level 1 is determined based on the UV transmittance when a UV blocking lens known to have a UV blocking function is measured. In addition, UV transmission level 4 is a state which transmits substantially ultraviolet rays.

In this apparatus, the ultraviolet light transmittance of the lens LE can be accurately measured from the change in the amount of light received by the light receiving sensor 15 by the plurality of indicators (holes) 20 of the indicator plate 14. For example, in a configuration in which four indicators (holes) are arranged around the optical axis 1, when the light source 30 is deflected from the optical axis L1, the indicator shape detected by the light receiving sensor 15 is insufficient due to the refractive power of the lens LE. The measurement accuracy of the ultraviolet ray transmittance based on the amount of light is inferior. On the other hand, by the large number of indicators 20 arranged in the range of diameters close to the diameter of the opening 4a, even if the indicator shape detected by the light receiving sensor 15 is slightly missed, ultraviolet light transmittance can be measured from the amount of light in the remaining many indicator shapes. . In other words, even if the number of surface features decreases slightly, the amount of light per surface feature can be obtained by dividing the total amount of light in many remaining surface shapes by the number of surface features, so that UV transmittance can be obtained more precisely than in the case of several measurement indexes. have.

Next, by using the device having the above-described configuration, the UV transmission of the old spectacle lens used by the customer to the optician, etc. and the UV transmission of the UV-blocking lens recommended by the sales representatives such as the optician to measure and compare This will be described.

First, the ultraviolet transmittance of the spherical spectacle lens is measured. When the old spectacle lens is placed on the nose piece 4 and the switch 8 is pressed for 1 second or more, the arithmetic control unit 40 switches from the refractive index measurement mode to the ultraviolet transmittance measurement mode, turns on the light source 30 to start measurement of the ultraviolet transmittance. . The arithmetic and control unit 40 calculates the ultraviolet transmittance of the old spectacle lens based on the output signal from the light receiving sensor 15, and stores the result in the memory 42. In addition, the UV transmission level is displayed on the display 2.

4 is an example of a display screen of the measurement results at this time. On the display screen of the display 2, the marks of the level marks 101a to 101d indicating where the obtained ultraviolet transmittances correspond to the UV transmission levels 1 to 4 and the ultraviolet transmission rates represented by the UV transmission levels 1 to 4 are indicated by the size of the arrow. Arrow marks 102a to 102d are displayed. In addition, in the edge 104, the lens mark 105 indicating the lens to be measured, the arrow mark 106 indicating the amount of ultraviolet light incident on the target lens, and the arrow indicating the amount of ultraviolet light passing through the target lens are provided so that the measurement result can be easily understood. Mark 107 is indicated. In this example, the measured spherical spectacle lens is determined to be UV transmission level 4, the mark 101d is displayed upside down, and the mark 107 is displayed the same as the mark 102d indicating the UV transmission level 4. Therefore, this spherical spectacle lens can be easily understood as hardly blocking ultraviolet rays.

The icon 110 in the display screen of Fig. 4 is an additional measurement icon for initiating the measurement of the UV transmittance of another lens to be compared with respect to the previously measured lens. Here, when the UV cut-off lens to be compared is placed on the nose piece 4 and the switch 3a corresponding to the icon display for further measurement is pressed, the measurement of the UV transmittance of the lens is started. The arithmetic and control unit 40 calculates the ultraviolet transmittance of the UV blocking lens based on the output signal from the light receiving sensor 15, and stores the result in the memory 42. In addition, the UV transmission level is displayed on the display 2.

5 is an example of a display screen of the measurement results at this time. The frame 120 indicates the measurement result of the spherical spectacle lens, which is measured first, and marks 105, 106, and 107 as in the frame 104 of FIG. 4 are displayed. On the other hand, the inside of the edge 121 shows the measurement result of the UV-blocking lens further measured for comparison, the mark 105, 106 and the same mark 107 and the inside of the edge 104 and the inside of the edge 104 is displayed. In this example, the further measured UV blocking lens is determined to be UV transmission level 1, and mark 107 is displayed such as mark 102a indicating UV transmission level 1. In addition, a number 1 indicating the measurement procedure 1 is assigned to the edge 120, and a number 2 indicating the measurement procedure 2 is assigned to the edge 121.

The customer can easily understand the difference in the UV transmittance of each lens by showing the display screen of the display 2 in which the measurement results of the UV transmittance of the old spectacle lens and the UV transmittance of the UV blocking lens are simultaneously displayed.

Further, in the display screen of FIG. 5, when the switch 3a for further measurement for comparing another third lens is pressed, the ultraviolet transmittance of the third lens is measured, and the result is stored in the memory 42. FIG. When the third lens is additionally measured by the switch 3a, the operation control unit 40 replaces the measurement result of the newly measured third lens instead of the measurement result of the second lens of FIG. Same as inside). At this time, the number 3 indicating the measurement procedure 3 is given to the measurement result of this 3rd lens. By this, it is possible to easily compare the difference between the ultraviolet ray transmittance of the spherical spectacle lens measured for the first time and the ultraviolet ray transmittance of the third lens. By using the switch 3a for additional measurement in this manner, it is possible to sequentially display the measurement results of other lenses to be compared with respect to the measurement results of the spherical spectacle lenses measured for the first time.

Although the measurement results of two different lenses are shown in the example of FIG. 5, the measurement results may be additionally displayed every time a new lens is measured by pressing the switch 3a. In the example of FIG. 6, the inside of the edge 122 shows the measurement result of the 3rd lens measured further.

4 to 6, the icon 111 is an icon for returning to the screen of the refractive power measurement mode. When the switch 3b corresponding to the icon 111 is pressed, the icon 111 is switched to the refractive power measurement mode. Is switched to the screen for measuring the refractive power as shown in FIG.

In addition, in the above, although the lens meter provided with the ultraviolet transmittance measuring function was demonstrated as an example, this invention is applicable also to the UV meter for measuring an ultraviolet transmittance. As a simple structure of the UV meter, as shown in Fig. 7, a light source 50 such as an LED emitting ultraviolet light, a collimating lens 51, a pinhole plate 52, a space 53 into which the lens can be inserted, a filter 54 transmitting ultraviolet light, , The condenser lens 55 and the light receiving sensor 56 are preferable.

The ultraviolet light beam from the light source 50 becomes the parallel light beam by the collimating lens 52, passes through the lens LE injected into the space 53, and enters the light receiving sensor 56 through the filter 54 and the condenser lens 55. The calculation control unit 57 calculates the ultraviolet transmittance of the lens LE based on the output signal from the light receiving sensor 56. Display 58 displays the result.

According to the present invention, it is possible to clearly show the difference in the ultraviolet transmittance of the spectacle lens.

Claims (5)

A first transmission optical system having a first light source and transmitting a first light in an ultraviolet region for measuring ultraviolet transmittance to a lens to be measured; A first light receiving optical system having a first light receiving element and receiving the first light transmitted through the object lens from the first light receiving element; A calculating unit for obtaining ultraviolet transmittance of the target lens based on the output of the first light receiving element; With display, And a control unit for displaying the ultraviolet transmittance of the first target lens and the ultraviolet transmittance of the second target lens so as to be comparably displayed on the same screen as the display. The method of claim 1, And said calculating unit applies the obtained ultraviolet transmittance to the corresponding levels of the plurality of ultraviolet transmittance levels. The method of claim 2, And the control unit displays the ultraviolet ray transmission level of the first target lens and the ultraviolet ray transmission level of the second target lens on the same screen of the display. The method of claim 1, A second projection optical system having a second light source and transmitting a second light for refractive index measurement to a target lens; A second light receiving optical system having a second light receiving element and receiving from a second light receiving element for transmitting the second light passing through the object lens; Further comprising mode switching means for switching the refractive power measurement mode and the UV transmittance measurement mode, The calculating unit obtains the refractive power of the target lens based on the output of the second light receiving element, And the control unit switches the screen of the display based on the switching of the measurement mode by the mode switching unit. The method of claim 4, wherein The first and second projection optical system has a common transmission lens, The first and second light receiving optical systems have a common measurement indicator plate, The spectacle lens measuring apparatus of claim 1, wherein the first and second light receiving elements are shared.

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