JP6800455B2 - Lens meter - Google Patents

Description

The present invention relates to, for example, a lens meter capable of measuring optical characteristics such as spherical lens power of spectacle lenses and contact lenses.

Conventionally, various progressive power lenses have been commercially available for correcting visual acuity of presbyopia and for reducing eye strain when working on a personal computer. Then, a lens meter provided with a progressive power measurement mode for measuring the degree of addition of these progressive power lenses is commercially available. In the progressive power measurement mode, the value of the refractive power of the distance portion is first obtained, and then the lens is moved in the direction of the near portion to measure the degree of addition.

The progressive power lens before processing has a mark (near eye point) indicating the measurement position of the near portion printed on the frame, but after processing the frame, the near eye point is erased and the near portion is erased. Since it is difficult to grasp the position of the lens, there is a problem that it is difficult to move the progressive power lens, which is the test lens, to the near portion to measure the degree of addition.

Patent Document 1 describes the length of each side of a deformed quadrangle formed by passing through four points forming a square and then refracting according to the refraction characteristics of the lens to be inspected: Lx1, Lx2, Ly1, Ly2. Is disclosed, and a lens meter that calculates and displays the direction of the degree of addition of the progressive power lens by using the value of the difference in length between the sides facing each other in the deformed quadrangle is disclosed.

Japanese Patent No. 3663065

In Patent Document 1, the direction of addition (agreeing with "direction of near portion", hereinafter "direction of near portion") is calculated and displayed using the value of the optical characteristic of the lens to be measured. , It is said that the direction of the near part during measurement can be grasped. However, when the test lens is moved from the distance portion to the near portion, the test lens is often rotated in the left-right direction, and the direction of the near portion calculated during measurement as in Patent Document 1. However, since it is difficult for the examiner to know in which direction the lens to be moved is to be moved, the lens to be tested cannot be accurately moved from the distance portion to the near portion, and the addition degree is measured. There is a problem that it is difficult to measure accurately.

The present invention has been made to solve the above problems, and is measured with an input means for inputting the direction of the near portion in the progressive power measurement mode for measuring the addition degree of the progressive power lens. It is equipped with a calculation means that calculates the direction of the near portion based on the result of the optical characteristics, and calculates and monitors the deviation angle between the direction of the near portion input by the input means and the direction of the near portion calculated by the calculation means. It is an object of the present invention to provide a lens meter that can be displayed on the screen to easily and accurately measure the degree of addition.

Lens meter according to claim 1 for achieving the above object, a measurement light flux allowed transmits through the inspected lens is placed on the projected by the lens受上from the light emitting means detected by the photoelectric conversion type light receiving means, wherein In a lens meter that measures the optical characteristics of the lens under test based on the detection value detected by the light receiving means, the addition degree measurement mode for measuring the addition degree of the progressive power lens and the direction of the near portion of the progressive power lens. The first input means for inputting, the first calculation means for calculating the direction of the near portion based on the optical characteristics measured in the addition degree measurement mode, the direction of the near portion input by the first input means, and the first Calculated by the second calculation means for calculating the deviation angle from the direction of the near portion calculated by the calculation means , the direction of the near portion input by the first input means calculated by the second calculation means, and the first calculation means. It is characterized by being provided with a display means for displaying the deviation angle from the direction of the near vision portion .

The lens meter according to claim 2 is the lens meter according to claim 1, wherein the first input means is calculated from the progressive band length and the inset amount (internal alignment amount) of the progressive refractive power lens which is the test lens. It is characterized in that the direction of the near vision is input.

The lens meter according to claim 3 is the lens meter according to claim 1, wherein the first input means is a second input means for inputting the progressive band length and the inset amount of the progressive power lens which is the test lens. It is characterized in that the direction of the near portion calculated from the progressive band length and the inset amount input by the second input means is input.

The lens meter according to claim 4 is the lens meter according to claim 1, wherein the first input means is a near portion calculated based on the measurement result of optical characteristics at the time of progressive band measurement in the addition degree measurement mode. It is characterized by inputting a direction.

The lens meter according to claim 5 is the lens meter according to any one of claims 1 to 4, and when the deviation angle calculated by the second calculation means exceeds a predetermined angle, the display means. It is characterized by being provided with a display control means for displaying a warning.

The lens meter according to claim 6 detects a measurement light beam projected from a light emitting means and transmitted through a lens to be mounted on a lens receiver by a photoelectric conversion type light receiving means, and is detected by the light receiving means. In a lens meter that measures the optical characteristics of the lens to be inspected based on the value, the addition degree measurement mode for measuring the addition degree of the lens contact member with which the test lens abuts and the progressive refractive force lens, and the addition degree measurement mode Calculates the deviation angle between the first calculation means that calculates the direction of the near portion based on the measured optical characteristics and the direction of the near portion calculated by the first calculation means and the vertical axis with respect to the contact surface of the lens contact member. It is characterized in that it is provided with a third calculation means.

In the lens meter according to claim 1, for example, when data such as a distance eye point, a near eye point, and a progressive zone length presented by the manufacturer of the lens to be inspected are clear, the direction of the near portion from these values. Can be calculated. If the above data is unknown, the direction of the near portion may be calculated using data such as a standard distance eye point, near eye point, and progressive zone length. The direction of the near portion obtained in this way is input by the first input means, and the difference (deviation angle) from the direction of the near portion calculated from the value of the optical characteristics of the lens under test is grasped. Can be done. As a result, the lens to be inspected can be guided in the direction of the near portion, so that the value of the degree of addition can be measured easily and accurately.

In the lens meter according to claim 2, the direction of the near portion is the direction of the near portion calculated from data such as the progressive band length and the inset amount (inward alignment amount) presented by the manufacturer of the lens to be inspected. By inputting by 1 input means, the difference (deviation angle) from the direction of the near portion calculated from the value of the optical characteristics of the lens under test can be grasped, so that the addition degree can be easily and accurately determined. The value can be measured.

In the lens meter according to claim 3, by providing a second input means for inputting the progressive band length and the inset amount presented by the manufacturer, the direction of the near portion from the input progressive band length and the inset amount. Can be calculated, so that the value in the direction of the near portion to be input to the first input means can be easily input.

In the lens meter according to claim 4, when data such as the progressive band length and the inset amount (inward alignment amount) of the test lens is unknown, for example, a plurality of lenses calculated when moving the test lens to the near portion. The average value of the values in the direction of the near portion of can be input as the value in the direction of the near portion to be input to the first input means. Further, the average value of the values in the direction of the near portion calculated at the position where the degree of progression is high can be input as the value in the direction of the near portion to be input to the first input means. As a result, even when data such as the progressive band length and the inset amount (inward alignment amount) of the test lens are unknown, the difference (deviation angle) from the direction of the near portion can be grasped.

In the lens meter according to claim 5, the deviation amount can be easily grasped visually by displaying the difference (deviation angle) from the direction of the near portion calculated by the second calculation means on a display unit such as a monitor. Therefore, the value of the degree of addition can be easily and accurately measured.

In the lens meter according to claim 6, an allowable angle (predetermined angle) is set in advance with respect to the deviation angle calculated by the second calculation means, and a warning is displayed when the deviation angle exceeds the allowable angle. As a result, the value of the degree of addition can be easily and accurately measured without constantly checking the value of the deviation angle displayed on the display means.

In the lens meter according to claim 7, instead of the deviation angle between the direction of the near portion input in advance and the direction of the near portion calculated based on the optical characteristics, the axis perpendicular to the contact surface of the lens contact member and the optics. The deviation angle from the direction of the near portion calculated based on the characteristics may be calculated. By using the deviation angle calculated in this way, the lens to be inspected can be guided in the direction of the near portion, so that the value of the degree of addition can be easily and accurately measured.

It is a figure explaining the whole structure of the lens meter which concerns on embodiment of this invention. It is a figure explaining the optical system of the lens meter which concerns on embodiment of this invention. It is a figure explaining the example of the pattern plate used in the lens meter which concerns on embodiment of this invention. It is a figure explaining the operation flow of the lens meter which concerns on embodiment of this invention. It is a figure explaining (a) an example of the progressive band length and the inset amount of the progressive power lens, and (b) the method of calculating the direction of the near portion from the progressive band length and the inset amount, respectively. It is a figure which shows (a) an example of a monitor display screen in a progressive power mode, (b) an example of an input screen which inputs a progressive band length and an inset amount. (A) is an example of the direction (broken line) of the near portion calculated from the input data of FIG. 6 (b), and (b) is an example of a screen display for measuring the distance portion. (A) An example of screen display when moving the test lens from the distance portion to the progressive zone portion, (b) A display displaying the direction of the near portion calculated from the measured value of the optical characteristics in the progressive zone length portion. It is a figure explaining each example of a screen. (A) In the state of (b) and (a), the direction of the near portion calculated in FIG. 8 (b) is aligned with the direction (broken line) of the near portion calculated from the input data of FIG. 6 (b). It is a figure explaining the state of moving the test lens to the near portion, respectively. It is a figure which shows an example of the warning display when the direction of the near portion of the test lens deviates from the direction (broken line) of the near portion calculated from the input data of FIG. 6B. It is a figure explaining an example of (a) the relationship between a lens table and a lens under test, and (b) a method of moving a lens under test in the direction of a near portion using a vertical line with respect to the lens table.

Hereinafter, the lens meter 1 according to the embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a diagram showing the overall configuration of the lens meter 1 according to the embodiment of the present invention, and FIG. 2 is a diagram showing an optical system of the lens meter 1 according to the embodiment of the present invention.

As shown in FIG. 1, the lens meter 1 according to the embodiment includes an optical system 10 and a main body 100. The optical system 10 includes a measuring light source 11 for measuring the refractive power of the lens to be inspected, an RGB type CMOS image sensor 26, and the like.

The main body 100 is composed of a calculation / control processing unit 101, a monitor 102, a touch panel 103, a switch button 104, a printer 105, a memory 106, a buzzer 107, and the like. The control signal from the calculation / control processing unit 101 controls the lighting / extinguishing of the measurement light source 11 and the control of the CMOS image sensor 26. Further, the image data acquired by the CMOS image sensor 26 is input to the calculation / control processing unit 101. Then, the image data input to the calculation / control processing unit 101 is subjected to calculation processing to calculate the value of the refractive power of the lens under test. The calculation / control processing unit 101 stores the calculated result in the memory 106 and displays it on the monitor 102.

Next, the optical system 10 will be described with reference to FIG. The optical system 10 includes a light projecting unit including a measurement light source 11 and the like, and a light receiving unit including a CMOS image sensor 26 and the like.

In the present embodiment, for example, a green light LED having a wavelength of 535 nm is adopted as the measurement light source 11. Since the refractive power of the spectacle lens is priced by the d-line (587.56 nm) or the e-line (546.07 nm), which are the reference wavelengths, in the present embodiment, green light of 535 nm, which is close to these reference wavelengths, is adopted. However, the present invention is not limited to this, and an LED of red light having a wavelength longer than that of green light may be adopted. The error caused by the difference from the reference wavelength is corrected by the calibration work using the reference lens.

The green light (hereinafter referred to as “measurement light”) emitted from the measurement light source 11 is incident on the diaphragm 16 and the collimator lens 17. The diaphragm 16 is a thin flat plate provided with a circular through hole, and limits the luminous flux diameter of the light emitted to the lens 18 to be inspected. When the luminous flux diameter of the light emitted to the test lens 18 is too large, another component (not shown) arranged between the collimator lens 17 and the test lens 18 is irradiated, and the reflected light is emitted from the test lens 18. There is a risk of getting in. The diaphragm 16 limits the luminous flux diameter of the light irradiating the test lens 18 to prevent the reflected light from other components from entering the test lens 18.

Further, the measurement light source 11 is arranged at a position of the rear side focal length (back focus) of the collimator lens 17. As a result, the measurement light becomes parallel light by the collimator lens 17 and irradiates the test lens 18 perpendicularly. The lens receiver 19 is a stand on which the lens 18 to be examined is placed, and the lens 18 to be examined is arranged by the lens receiver 19 at a certain distance from the CMOS image sensor 26 which is a light receiving element, and has a refractive power or the like. Optical properties are measured.

The measurement light transmitted through the test lens 18 is incident on the cover glass 20, the pattern plate 21, and the condenser lenses 22, 23, 24, and then on the CMOS image sensor 26.

Here, the cover glass 20 is a flat plate-shaped plate glass arranged to protect the light receiving portion from dust and the like, and in the present embodiment, the measurement light transmitted through the test lens 18 is transmitted with a transmittance of approximately 100%. To allow for this, both the top and bottom surfaces are multi-coated to prevent reflection. It should be noted that the multi-coating is not indispensable, and an appropriate antireflection coating may be applied as needed.

As the pattern plate 21, for example, a disk-shaped flat plate provided with four circular through holes 21a, 21b, 21c, and 21d centered on each apex of the square as shown in FIG. 3A can be adopted. The measurement light transmitted through the test lens 18 is refracted according to the refractive power of the test lens 18 and is incident on the pattern plate 21 to become four separated lights. The four separated lights are condensed by the condenser lenses 22, 23 and 24 and imaged on the light receiving surface of the CMOS image sensor 26.

Since the positions where the four lights are imaged on the light receiving surface of the CMOS image sensor 26 change according to the refractive power of the lens 18 to be inspected, the positions of the center of gravity (coordinate positions) of the four lights are the image data of the CMOS image sensor 26. By calculating from, the value of the refractive power of the lens 18 to be examined can be calculated. A method for calculating the values of optical characteristics such as the spherical power S, the cylindrical power C, and the astigmatic angle A from the four coordinate positions is disclosed in Japanese Patent No. 3150404 and the like, and details thereof will be omitted here.

Further, the measurement light in this embodiment is green light as described above. Therefore, the calculation / control processing unit 101 selectively extracts the electric signal received on the G light receiving surface from the R light receiving surface (red), the G light receiving surface (green), and the B light receiving surface (blue) of the CMOS image sensor 26. The optical characteristics such as the refractive power of the lens 18 to be inspected can be obtained by processing with. That is, by adopting the RGB type CMOS image sensor 26 as the light receiving element as in the present embodiment, it is not necessary to arrange a filter or the like for selectively receiving the measurement light.

Next, the operation method in the present embodiment will be described with reference to FIGS. 4 to 9. FIG. 4 shows an example of the operation flow of the lens meter according to the embodiment of the present invention. In this embodiment, the test lens 18 is a progressive power lens, and an input screen in which the progressive band length (mm) and the inset amount (inward alignment amount: mm) provided by the manufacturer are displayed on the monitor 102. The direction (angle) of the near portion calculated by processing the input inset amount and the progressive band length in the calculation / control processing unit 101 is set as the "direction of the first near portion", and the lens is covered. The direction of the near portion calculated at the time of measuring the degree of addition of the inspection lens 18 is described as "the direction of the second near portion". The "direction of the first near portion" is not limited to the one calculated by the above method, and the one calculated by various other methods can also be adopted.

First, in step S10, the measurement mode is switched to the progressive power lens mode. FIG. 6A shows an example of the screen display when the monitor 102 is switched to the progressive power lens mode. By pressing the mode switching button 120 at the lower left of the display screen, the measurement mode can be switched between the normal mode and the progressive power lens mode. Here, the target lens 113 modeled on the progressive power lens is displayed on the measurement screen 112 of the display screen. The progressive power lens is like the target lens 113. It includes a region of the distance portion FA, a region of the near portion NA, a region of the progressive zone portion PA, and a region of the astigmatism portion AS on both sides. As described below, the progressive power lens first measures the refractive power of the distance portion FA, then moves the progressive power lens from the distance portion FA to the progressive zone portion PA, and further, the near portion. Move to NA, measure the refractive power of the near portion NA, calculate the difference between the refractive power of the remote portion FA and the refractive power of the near portion NA as the value of the addition degree (ADD), and use the monitor 102 or the like. Display on the display.

Next, in step S12, the progressive band length ΔP and the inset amount ΔIS of the lens 18 to be examined are input. Here, the progressive zone length ΔP and the inset amount ΔIS will be described with reference to FIG. 5A. FIG. 5A is a data diagram showing the positions of the distance eye point Fp and the near eye point Np of the progressive power lens provided by the manufacturer. The vertical difference between the distance eye point Fp and the near eye point Np is the progressive zone length ΔP, and the lateral difference between the distance eye point Fp and the near eye point Np is the inset amount ΔIS. If the progressive band length ΔP and the inset amount ΔIS are provided as data, enter the values. If it is not provided as data, measure it with a measure or the like to obtain the progressive band length ΔP and the inset amount ΔIS, and input the obtained values.

The progressive band length ΔP and the inset amount ΔIS are input using the touch panel 103 on the monitor 102. When the D0 input button 121 at the lower left of the display screen displayed on the monitor 102 is pressed, as shown in FIG. 6B, the measurement screen 112 displays a screen for inputting the progressive band length ΔP and the inset amount ΔIS. Will be done. Then, the ten keyboard 133 is displayed on the left side of the measurement screen 112. When inputting the progressive band length ΔP, after touching the ΔP data unit 131, the progressive band length ΔP is input using the ten-keyboard 133 (in FIG. 6B, the case where “16” is input is exemplified. ). When inputting the inset amount ΔIS, after touching the ΔIS data unit 132, the inset amount ΔIS is input using the ten-keyboard 133. The input method for the progressive band length ΔP and the inset amount ΔIS is not limited to the above method. For example, if an external keyboard can be connected to the lens meter, the input can be performed using the external keyboard. it can.

Next, in step S14, the direction D0 of the first near portion is calculated from the input progressive band length ΔP and inset amount ΔIS. As shown in FIG. 5B, the direction D0 of the first near portion can be obtained from the progressive zone length ΔP and the inset amount ΔIS. When the D0 input button 121 is pressed again, the direction D0 of the first near portion is calculated, and the broken line 115 indicating the direction D0 of the first near portion is displayed in the measurement screen 112 of FIG. 7A. To.

Next, in step S16, the refractive power of the distance portion of the lens 18 to be inspected is measured. When the lens 18 to be inspected is placed on the lens receiver 19, a circle mark 116 is displayed at the center 114 of the measurement screen 112. The circle mark 116 is a model of the lens receiver 19, and by displaying the lens on the target lens 113 modeled on the progressive power lens, it is possible to visually recognize which position of the lens 18 to be measured. It is displayed on the measurement screen 112 as described above. When the distance portion of the lens 18 to be inspected is not on the lens receiver 19 (that is, the circle mark 116 is not on the distance portion FA of the target lens 113), the arrow mark 134 is displayed on the measurement screen 112. The distance portion FA of the target lens 113 is moved according to the arrow mark 134 so that the distance portion FA of the target lens 113 comes to the circle mark 116 of the measurement screen 112, and the refractive power of the distance portion is measured. When the measurement of the distance portion of the lens 18 to be examined is completed in step S18 (distance portion measurement: OK), the value of the refractive power of the distance portion is stored in the memory 106 in step S20 and displayed on the monitor 102. If the measurement of the distance portion is not completed (measurement of the distance portion: NG), the process returns to step S16 and the measurement of the distance portion is continued.

When the measurement of the distance portion is completed, the progressive zone portion of the test lens 18 is measured in step S22. When the value of the refractive power of the distance portion of the test lens is stored in the memory 106 in step S20, the arrow mark 134 is displayed on the measurement screen 112 of FIG. 8A. The lens 18 to be inspected is moved to the progressive zone according to the displayed arrow mark 134. That is, the lens 18 to be inspected is moved according to the arrow mark 134 so that the progressive zone portion PA of the target lens 113 comes to the circle mark 116 on the measurement screen 112, and the refractive power of the progressive zone portion is measured.

In step S24, the direction D1 of the second near portion is calculated from the measured value of the refractive power of the progressive zone portion. A method of calculating the direction of the near portion (consenting with the direction of the addition degree) from the value of the refractive power of the lens 18 to be inspected has been published in Patent Document 1 and the like, and thus details will not be described here.

In step S26, the direction D0 (broken line 115) of the first near portion calculated in step S14 and the direction D1 (thick line 117) of the second near portion calculated in step S24 are overlapped with each other on the monitor 102. It is displayed on the measurement screen 112.

In step S28, the test lens 18 is rotationally moved so that the direction D1 (thick line 117) of the second near portion coincides with the direction D0 (broken line 115) of the first near portion (FIG. 8 (b). ) In the figure (1)). In step S30, it is determined whether the direction D1 (thick line 117) of the second near portion coincides with the direction D0 (broken line 115) of the first near portion. If they match (Y: OK), the process proceeds to step S32. If they do not match (N: NG), the process returns to step S28, and the rotational movement of the test lens 18 is performed again so as to match.

In step S32, the test lens 18 is moved to the near portion. When the direction D0 (broken line 115) of the first near portion and the direction D1 (thick line 117) of the second near portion match, the first near portion matches on the measurement screen 112 of FIG. 9 (a). The arrow mark 134 is displayed in the direction parallel to the direction D0 (broken line 115) and the direction D1 (thick line 117) of the second near portion. The test lens 18 is moved from the progressive zone portion to the near portion according to the arrow mark 134. That is, the lens 18 to be inspected is moved according to the arrow mark 134 so that the circle mark 116 on the measurement screen 112 comes to the near portion NA of the target lens 113.

In step S34, the refractive power of the near portion of the test lens 18 is measured. As shown in FIG. 9B, after moving the near portion NA of the target lens 113 to the circle mark 116 on the measurement screen 112, press the switch button 104 or the like to determine the refractive power of the near portion of the lens 18 to be inspected. To do. At this time, if the direction D0 (broken line 115) of the first near portion and the direction D1 (thick line 117) of the second near portion are misaligned (N: measurement NG), the process returns to step S28 and the second step is performed. The direction D0 (broken line 115) of the near portion 1 and the direction D1 (thick line 117) of the second near portion are made to coincide again. When the measurement of the near portion is completed (Y: measurement OK), the addition degree (ADD) is calculated in step S36, stored in the memory 106, and displayed on the monitor 102.

In step S38, it is determined whether or not the measurement is completed. If the measurement is completed (Y), the operation is completed. In the case of measuring again (N), the process returns to step S12, and if necessary, the progressive band length ΔP and the inset amount ΔIS are input again to measure the lens 18 to be inspected.

As described above, according to the method according to the present embodiment, the direction D0 of the first near portion input by the input means and the direction D1 of the second near portion calculated by the calculation means are transmitted to the monitor 102. Since it is possible to display, grasp the deviation angle, and measure in agreement, the lens 18 to be inspected is easily and accurately moved from the distance portion to the near portion to measure the addition degree. Can be done. This makes it possible to measure the degree of addition accurately.

Here, the lens meter 1 is an example of a lens meter, the lens 18 to be examined is an example of a lens to be examined, the memory 106 is an example of storage means, and the monitor 102 is an example of display means. The direction D0 of the near portion is an example of the direction of the near portion input by the first input means, and the direction D1 of the second near portion is an example of the direction of the near portion calculated by the first calculation means. , The progressive zone length ΔP is an example of the progressive zone length, and the inset amount ΔIS is an example of the inset amount. The progressive power lens mode is an example of the addition degree measurement mode.

The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, the present invention is not limited to the one applied to the above-described embodiment, and may be applied to an embodiment in which these embodiments are appropriately combined, and the present invention is not particularly limited.

For example, in the above embodiment, the pattern plate 21 has the four holes shown in FIG. 3A, but the pattern plate is not limited to this. For example, it is also possible to adopt a Hartmann plate provided with a large number of through holes as in the pattern plate 210 of FIG. 3 (b). Further, although not shown in the present specification, a circular pattern may be adopted. That is, the patterns disclosed in various patent documents can be adopted.

In the above embodiment, the direction D0 of the first near portion is calculated from the progressive band length ΔP and the inset amount ΔIS of the test lens which is a progressive power lens, but the direction D0 of the first near portion The calculation method of is not limited to this. Depending on the lens to be inspected, the progressive zone length ΔP and the inset amount ΔIS may be unknown. In such a case, for example, a general progressive zone length ΔP and an inset amount ΔIS may be adopted. Further, the refractive power may be measured a plurality of times at the time of measuring the progressive zone portion of the lens 18 to be inspected, and the direction of the near portion obtained from the average value may be the direction D0 of the first near portion, or the progressive zone portion. The degree of progression may be measured at the same time, and the direction of the near portion obtained from the value of the refractive power measured when the value of the degree of progression is maximum may be the direction D0 of the first near portion. When the direction D0 of the first near portion is obtained from the refractive power measured at the time of measuring the progressive zone portion of the test lens 18 in this way, the progressive zone length ΔP and the inset amount ΔIS are as in the above embodiment. Since there is no need to enter, the operation can be simplified.

Further, as shown in FIG. 10, when the near portion of the test lens 18 is measured and the direction D1 of the second near portion deviates from the direction D0 of the first near portion by a predetermined angle or more. An error message 135 may be displayed on the monitor 102 to warn the user. The warning method is not limited to the display of the error message 135, and the buzzer 107 may generate a warning sound. In this way, by using the warning display and the warning sound, the lens 18 to be inspected can be accurately checked without constantly checking the deviation between the direction D0 of the first near portion and the direction D1 of the second near portion. It can be moved to the near portion.

Further, as shown in FIG. 11A, instead of the direction D0 of the first near portion of the above embodiment, the vertical axis with respect to the contact surface 140a of the lens table 140, which is the lens contact member of the lens 18 to be inspected. 118 may be used. As shown in FIG. 11B, the vertical axis 118 is superposed on the measurement screen 112 of the monitor 102 in the direction D1 of the second near portion calculated from the refractive power of the lens 18 to be examined, and is displayed vertically. By making it possible to confirm the amount of deviation ΔD from the shaft 118, the lens 18 to be inspected can be accurately moved to the near portion when measuring the degree of addition.

1 ・ ・ Lens meter 10 ・ ・ Optical system 11 ・ ・ Measurement light source 18 ・ ・ Lens to be inspected 26 ・ ・ CMOS image sensor 101 ・ ・ Calculation / control processing unit 102 ・ ・ Monitor 112 ・ ・ Measurement screen 115 ・ ・ First Direction of near portion D0
117 ... Direction D1 of the second near portion
140 ... Lens table

Claims (6)

The measured luminous flux projected from the light emitting means and transmitted through the lens to be mounted on the lens receiver is detected by the photoelectric conversion type light receiving means, and the test lens is based on the detected value detected by the light receiving means . In a lens meter that measures optical characteristics
The addition degree measurement mode that measures the addition degree of the progressive power lens, and
A first input means for inputting the direction of the near portion of the progressive power lens, and
A first calculation means for calculating the direction of the near portion based on the optical characteristics measured in the addition degree measurement mode, and
A second calculation means for calculating the deviation angle between the direction of the near portion input by the first input means and the direction of the near portion calculated by the first calculation means, and
A display means for displaying the deviation angle between the direction of the near portion input by the first input means and the direction of the near portion calculated by the first calculation means calculated by the second calculation means.
A lens meter characterized by being equipped with. The first input means according to claim 1, wherein the first input means inputs the direction of the near portion calculated from the progressive band length and the inset amount (inward alignment amount) of the progressive refractive power lens which is the test lens. The lens meter described. The first input means is
It is equipped with a second input means for inputting the progressive band length and inset amount of the progressive power lens that is the test lens.
The lens meter according to claim 1, wherein the direction of the near portion calculated from the progressive band length and the inset amount input by the second input means is input. The lens meter according to claim 1, wherein the first input means inputs the direction of the near portion calculated based on the measurement result of the optical characteristics at the time of progressive band measurement in the addition degree measurement mode. .. Any one of claims 1 to 4, characterized in that the display means is provided with a display control means for displaying a warning when the deviation angle calculated by the second calculation means exceeds a predetermined angle. The lens meter described in the section . The measured luminous flux projected from the light emitting means and transmitted through the lens to be mounted on the lens receiver is detected by the photoelectric conversion type light receiving means, and the lens to be tested is based on the detected value detected by the light receiving means . In a lens meter that measures optical characteristics
The lens contact member with which the lens to be inspected abuts
The addition degree measurement mode that measures the addition degree of the progressive power lens, and
A first calculation means for calculating the direction of the near portion based on the optical characteristics measured in the addition degree measurement mode, and
A third calculation means for calculating the deviation angle between the vertical axis with respect to the contact surface of the lens contact member and the direction of the near portion calculated by the first calculation means.
A lens meter characterized by being equipped with.