JP2009150803A - Defect evaluation device of lens, and defect evaluation method of lens - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a defect evaluation device of a lens and a defect evaluation method of a lens capable of evaluating objectively and quantitatively a defect of a lens such as a damage degree. <P>SOLUTION: This device is equipped with a light source 11 for irradiating light to a lens 100 which is an evaluation object, a light receiving element 143 for receiving transmission light irradiated from the light source 11 and transmitted through the lens 100, a measuring part 15 for measuring intensity of the transmission light received by the light receiving element 143, a rotation means 16 for rotating relatively the light receiving element 143 with respect to the lens 100, and an output means for outputting the intensity of the transmission light at each measuring angle α which is an angle formed between a measuring line A connecting a rotation center of the light receiving element 143 to the light receiving element 143 and an optical axis B of the lens 100. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a lens defect evaluation apparatus and a lens defect evaluation method.

Examples of the performance required for a lens such as a spectacle lens include optical characteristics, mechanical strength, and scratch resistance.
In particular, since plastic lenses, which have become the mainstream in recent years, are inferior in general surface hardness to glass lenses, the difficulty of scratching the surface is an important evaluation item.

For example, in Patent Document 1, a scratched object such as steel wool is pressed against the surface of a lens held by a holder with a constant load, and the lens and the scratched object are relatively moved in this state to evaluate the scratch resistance. A test method is disclosed.
In the actual use situation of the lens, a repeated load is often applied over a relatively large area as in the case of wiping the lens surface with a cloth. However, according to the test method described in Patent Document 1, such an actual condition is used. Tests close to the usage conditions can be performed with good reproducibility.

However, in the conventional test method as described in Patent Document 1, the measurer visually determines the degree of damage (such as the amount and size of the scratch) of the lens. For this reason, there is a possibility that the evaluation varies depending on the subjectivity of the measurer. In particular, when the scratch is small, the variation tends to increase.
A method using a haze meter is known to eliminate such evaluation variation and to objectively evaluate the degree of damage to the lens.
In general, this is a method that utilizes the fact that if the degree of damage to the lens is large, the diffusion of light increases and the haze increases.

FIG. 12 shows a schematic configuration of a general haze meter 2.
The haze meter 2 includes a light source 21, an optical system 22 that guides light from the light source 21, a support unit 23 that supports the lens 100 to be evaluated, an integrating sphere 24 that collects scattered light from the lens 100, and the intensity of the scattered light. And a processing unit 26 that performs arithmetic processing on the detection value of the detection unit 25.
The optical system 22 includes a condenser lens 221, a pinhole 222, and a collimator lens 223 in order from the light source 21 side.
The integrating sphere 24 has an integrating sphere main body 241 having an opening 241A on the light source 21 side, and a trap 242 provided on the opposite side of the integrating sphere main body 241 from the opening 241A.

Light from the light source 21 is collected in the pinhole 222 by the condenser lens 221, becomes parallel light through the collimator lens 223, and enters the lens 100.
Of the light transmitted through the lens 100, straight light is removed by the trap 242, and diffused light is collected by the integrating sphere body 241 at the detection unit 25.
The processing unit 26 computes the detection value of the detection unit 25 and calculates the diffuse transmittance of the lens 100.
Further, when the shutter 243 provided in the trap 242 is closed, the total light transmittance can be calculated by collecting all light rays in the detection unit 25.
The haze of the lens 100 is calculated from the diffuse transmittance thus obtained and the total light transmittance. It is considered that the greater the haze, the greater the degree of damage to the lens 100.

JP 2003-295131 A

  However, as indicated by β in FIG. 12, the angle of scattered light that can be measured with a general haze meter is as small as about 5 °. In such a narrow range, only a part of scattering due to scratches can be evaluated, and visual evaluation and haze meter evaluation are often different.

  An object of the present invention is to provide a lens defect evaluation apparatus and a lens defect evaluation method capable of solving the above-mentioned problems and the like, and objectively and quantitatively evaluating the defects of the lens such as scratches. Is to provide.

  The lens defect evaluation apparatus of the present invention includes a light source that irradiates light to a lens to be evaluated, a light receiving element that receives transmitted light that is emitted from the light source and transmitted through the lens, and the transmission that is received by the light receiving element. A measuring unit for measuring the intensity of light, a rotating means for rotating the light receiving element relative to the lens, a measurement line connecting the rotation center of the light receiving element and the light receiving element, and an optical axis of the lens Output means for outputting the intensity of the transmitted light for each measurement angle which is an angle formed by

According to the present invention, since the rotating means rotates the light receiving element relative to the lens, transmitted light having a wide range of measurement angles can be received by the light receiving element.
Accordingly, it is possible to measure the intensity of transmitted light having a large measurement angle that cannot be evaluated with a conventional haze meter, and to objectively and quantitatively evaluate the defects of the lens.

Moreover, since the output means outputs the intensity of transmitted light for each measurement angle, the intensity distribution of transmitted light with respect to the measurement angle can be evaluated.
For example, when a specific large scratch exists on the lens surface as compared with the surrounding area, a peak of transmitted light different from normal may appear at a specific measurement angle. However, such a phenomenon cannot be measured with a haze meter. On the other hand, according to the defect evaluation apparatus for a lens of the present invention, the intensity distribution of transmitted light can be measured, and such a specific flaw can be accurately evaluated.

  In addition, the fault of the lens in this invention means the defect of a lens which generate | occur | produces scattered light. Examples of the defects of the lens include scratches, peeling, foreign matter adhesion, and fogging.

In the lens defect evaluation apparatus according to the present invention, the lens defect evaluation apparatus includes a calculation unit that calculates an evaluation value obtained by evaluating the defect of the lens based on the intensity of the transmitted light for each measurement angle, and the output unit is calculated by the calculation unit. It is preferable to output the evaluated value.
According to such a configuration, since the calculation unit determines the final evaluation value of the lens, it is possible to eliminate the subjectivity of the measurer and evaluate the defect of the lens more objectively and quantitatively.

In the lens defect evaluation apparatus of the present invention, it is preferable that the calculation unit integrates the intensity of the transmitted light for each measurement angle over a preset angle range and calculates the evaluation value based on the integration value. .
According to such a configuration, the evaluation value is calculated based on the integrated value reflecting the transmitted light in a wide measurement angle range, so that the defect of the lens can be evaluated more objectively and quantitatively.

Here, as the range of the measurement angle for integration, for example, a range of −90 ° or more and 90 ° or less is preferable. This is because the field of view of the wearer when wearing glasses is assumed to be ± 90 °.
Further, for example, a range of −5 ° to 5 ° may be excluded as straight light. Thereby, it is possible to perform more accurate evaluation by excluding the straight light which is not related to the defect of the lens.

In the lens defect evaluation apparatus of the present invention, it is preferable that the calculation unit calculates the evaluation value based on the intensity of the transmitted light at a specific measurement angle set in advance.
According to such a configuration, for example, a measurement angle that tends to cause a difference in transmitted light intensity depending on the degree of the defect is specified, and the defect of the lens is efficiently evaluated by measuring the transmittance of only the measurement angle. be able to.
In the case of measurement of defects, the measurement angle is preferably selected from a range of 5 ° to 40 °. This is because within such a range, the intensity of transmitted light is likely to be different depending on the degree of defects of the lens.

In the lens defect evaluation apparatus of the present invention, it is preferable that the rotating means rotates the light receiving element in two directions in which the rotation axes are orthogonal to each other.
As a result of various studies, the present inventors have found that defects that cannot be observed when the light receiving element is rotated in only one direction can be observed by rotation in the other direction in which the rotation axis is orthogonal.
In other words, according to the present invention, the defect of the lens can be evaluated without omission by rotating the light receiving element in two directions in which the rotation axes are orthogonal to each other.

  In the lens defect evaluation method of the present invention, a light receiving operation in which transmitted light that is irradiated from a light source and transmitted through a lens is received by a light receiving element, and a rotating operation in which the light receiving element is rotated relative to the lens are alternately performed. Alternatively, a rotational light receiving process that is performed simultaneously, a measurement angle that is an angle formed by a measurement line that connects the rotation center of the light receiving element and the light receiving element, and the optical axis of the lens, and the transmitted light received by the light receiving operation. A measurement process for measuring the intensity of the lens, and an evaluation process for evaluating a defect of the lens based on the intensity of the transmitted light at each measurement angle measured in the measurement process.

  According to the present invention, since the light receiving element is rotated relative to the lens in the rotation operation, transmitted light having a large measurement angle that cannot be evaluated by a conventional haze meter can be received in the light reception operation. Thus, transmitted light in a wide angle range can be measured in the measurement process, and the defects of the lens can be objectively and quantitatively evaluated in the evaluation process.

  According to the lens defect evaluation apparatus or the defect evaluation method of the present invention, since the light receiving element is rotated relative to the lens, the intensity of transmitted light having a large measurement angle that cannot be evaluated by a conventional haze meter is also measured. It is possible to objectively and quantitatively evaluate lens defects.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The lens defect evaluation apparatus and the lens defect evaluation method of the present invention are not limited to the following embodiments.

[Configuration of defect evaluation device]
FIG. 1 shows a schematic configuration of a lens defect evaluation apparatus 1 according to the present embodiment.
As shown in FIG. 1, the defect evaluation apparatus 1 of the present embodiment includes a light source 11 that irradiates light to a lens 100 to be evaluated, an optical system 12 that guides light from the light source 11, and a support that supports the lens 100. Unit 13, light receiving unit 14 that receives the transmitted light that has passed through lens 100, measurement unit 15 that measures the intensity of the received transmitted light, and rotating means 16 that rotates light receiving unit 14 relative to lens 100. And an arithmetic unit (not shown) for calculating an evaluation value for evaluating the defect of the lens 100, and an output means (not shown) for outputting the intensity of the transmitted light and the evaluation value.

For example, a halogen lamp can be used as the light source 11. The measurement conditions may be changed as appropriate by changing the emission wavelength, irradiation intensity, and the like of the light source 11 according to the material of the lens 100.
The optical system 12 includes a condenser lens 121, a pinhole 122, and a collimator lens 123 in order from the light source 11 side.
The light from the light source 11 is collected in the pinhole 122 by the condenser lens 121, passes through the collimator lens 123, becomes parallel light, and enters the lens 100.

The light receiving unit 14 includes a substantially cylindrical unit main body 141, and a condensing lens 142 and a light receiving element 143 provided in the unit main body 141.
An opening (not shown) is provided on the lens body 100 side of the unit main body 141, and the transmitted light from the lens 100 taken through the opening is condensed on the light receiving element 143 by the condenser lens 142. .
The light receiving unit 14 includes a measurement unit 15 (not shown).

The measurement unit 15 includes an intensity measurement unit that measures the intensity of transmitted light received by the light receiving element 143, a measurement line A that connects the rotation center of the light receiving element 143 and the light receiving element 143, and the optical axis B of the lens 100. Measuring angle detecting means for detecting a measuring angle α which is an angle formed (not shown).
The rotating means 16 rotates the light receiving unit 14 around the lens 100 as shown in FIG. Here, the rotating means can rotate the light receiving unit 14 not only in one direction of rotation shown in FIG. 1 but also in another direction in which this direction and the rotation axis are orthogonal (see FIG. 2 described later). .
Examples of the output means include a display device such as a liquid crystal display and a printer.

[Defect evaluation method]
In the lens defect evaluation method of the present embodiment, the light receiving element 143 receives light transmitted from the light source 11 and transmitted through the lens 100, and rotation that rotates the light receiving element 143 relative to the lens 100. Based on the rotational light reception process that simultaneously performs the operation, the measurement angle α, the measurement process that measures the intensity of the transmitted light received in the light reception operation, and the transmitted light intensity for each measurement angle α that is measured in the measurement process And an evaluation process for evaluating the defects of the lens 100.

FIG. 2 shows an outline of the positional relationship among the light source 11, the lens 100, and the light receiving unit 14 in the rotational light receiving process.
In the present embodiment, as shown in FIG. 2, a lens 100 having a large number of scratches 100A parallel to the surface is a measurement target.
The scratch 100A can be formed by, for example, relatively moving a lens and a scratched object as described in Patent Document 1.

[Rotating light receiving process]
In carrying out the defect evaluation method, first, the lens 100 is set on the support portion 13 as shown in FIG.
Subsequently, the light source 11 is caused to emit light, and irradiation of light to the lens 100 is started.
The light emitted from the light source 11 is guided to the optical system 12 and enters the lens 100. Part of the light transmitted through the lens 100 is taken into the light receiving unit 14, collected by the condenser lens 142, and received by the light receiving element 143 (light receiving operation).

Next, the rotation operation is started by the rotation means 16 while continuing the light receiving operation.
In the rotation operation, as shown in FIG. 2A, the light receiving unit 14 is rotated in a plane perpendicular to the scratch 100A. This rotation operation is referred to as a vertical rotation operation.
In addition to the vertical rotation operation, as shown in FIG. 2B, a horizontal rotation operation for rotating the light receiving unit 14 in a plane parallel to the scratch 100A is also performed.
That is, in the rotation operation, the light receiving unit 14 is rotated in two directions in which the rotation axes are orthogonal to each other.

[Measurement process and evaluation process]
In the measurement process, the measurement unit 15 measures the intensity of the transmitted light received by the light receiving element 143 and detects the measurement angle α at that time. The intensity of the transmitted light for each measurement angle α thus obtained is transmitted to the output means and the calculation unit.
In the calculation process, the calculation unit integrates the intensity of transmitted light for each measurement angle α over a preset angle range, and calculates the evaluation value of the lens 100 based on the integration value. The computing unit also calculates an evaluation value based on the intensity of transmitted light at a specific measurement angle α set in advance. The obtained evaluation value is transmitted to the output means.
The output means outputs the intensity of transmitted light and the evaluation value for each received measurement angle α.

[Effects of Embodiment]
According to this embodiment, there are the following effects.
(1) Since the rotating means 16 rotates the light receiving unit 14 relative to the lens 100, the light receiving element 143 can receive transmitted light having a wide range of measurement angles α. As a result, the intensity of transmitted light having a large measurement angle α that cannot be evaluated with a conventional haze meter can be measured, and the defects of the lens 100 can be objectively and quantitatively evaluated.
(2) Since the output means outputs the intensity of the transmitted light for each measurement angle α, the intensity distribution of the transmitted light with respect to the measurement angle α can be evaluated. This makes it possible to accurately evaluate a specific flaw that shows a peak of transmitted light at a specific measurement angle α.

(3) Since the calculation unit determines the final evaluation value of the lens 100, the subjectivity of the measurer can be eliminated and the defects of the lens 100 can be evaluated more objectively and quantitatively.
(4) Since the calculation unit calculates the evaluation value based on the integrated value reflecting the transmitted light in a wide measurement angle range, the defect of the lens 100 can be evaluated more objectively and quantitatively.
(5) Since the calculation unit calculates an evaluation value based on the intensity of transmitted light at a specific measurement angle α set in advance, for example, the measurement angle α that easily causes a difference in transmitted light intensity depending on the degree of defects is specified. In addition, the defect of the lens 100 can be efficiently evaluated by measuring the transmittance of only the measurement angle α.

(6) Since the calculation unit calculates both the evaluation value based on the integral value and the evaluation value based on the intensity of transmitted light at the specific measurement angle α, even if there is a change in the evaluation value due to the calculation method, The defects of the lens 100 can be accurately evaluated.
(7) By rotating the light receiving unit 14 in two directions in which the rotation axes are orthogonal to each other, the defects of the lens 100 can be evaluated without omission.
(8) Since the lateral rotation operation of rotating the light receiving unit 14 in a plane parallel to the scratch 100A is performed, a large scratch generated on the surface of the lens 100 can be observed as a peak in the intensity distribution of transmitted light.

[Modification]
In addition, this invention is not limited to the above-mentioned embodiment, Other modifications etc. which can achieve the objective of this invention are included, The deformation | transformation etc. which are shown below are also contained in this invention.
In the above-described embodiment, the rotating unit 16 that rotates the light receiving unit 14 is illustrated, but the present invention is not limited thereto.
The rotating means 16 may be any means that relatively rotates the light receiving unit 14 and the lens 100.
For example, the rotating means 16 may rotate the lens 100 with respect to the fixed light receiving unit 14 as shown in FIG.
Even in such a case, the same excellent effects as those of the above-described embodiment can be obtained.

In the above-described embodiment, the parallel scratches 100A are illustrated as the defects of the lens 100. However, the present invention is not limited to this.
According to the defect evaluation apparatus 1 of the present invention, it is possible to evaluate defects of the lens 100 that cause scattered light, for example, various shapes of scratches, peeling, foreign matter adhesion, cloudiness, and the like.

In the above-described embodiment, the rotation unit 16 that rotates the light receiving unit 14 in two directions in which the rotation axes are orthogonal to each other is illustrated, but the present invention is not limited thereto.
For example, the number of rotation directions may be one, or three or more.
Even if the number of rotation directions is one, accurate evaluation can be performed as compared with the conventional visual evaluation. In addition, if there are three or more rotation directions, the defect of the lens 100 can be more accurately evaluated.

[Example]
EXAMPLES Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples.

[Example 1]
The lens 100 was evaluated by the defect evaluation apparatus 1 and the defect evaluation method described in the above embodiment.
As a measurement object, a lens 100 having different scratches was used.
A scratch 100A having a different degree was formed on the surface of the lens 100, and the size of the scratch 100A was visually evaluated. The largest scratch 100A was designated as visual evaluation 1, and the smallest one was designated as visual evaluation 9.

[Evaluation by vertical rotation]
FIG. 4 shows the intensity distribution of transmitted light with respect to the measurement angle α measured in the longitudinal rotation operation.
In FIG. 4, the vertical axis represents the relative intensity, and the horizontal axis represents the measurement angle α.
Based on the intensity distribution shown in FIG. 4, the integrated value of the intensity obtained in the range of the measurement angle α = 5 to 50 °, the intensity of the transmitted light at the measurement angle α = 10 °, and the evaluation value of the defect of the lens 100 based on these values. Is shown in Table 1 below. Table 2 shows the evaluation value calculation criteria.

From FIG. 4, it can be seen that the larger the scratch 100 </ b> A, the worse the visual evaluation, the greater the light scattering.
From Table 1, it can be seen that according to the defect evaluation apparatus 1 and the defect evaluation method of the present invention, the defect of the lens 100 can be objectively and quantitatively evaluated based on the integral value.
In particular, sample no. 2 and Sample No. No. 3 was difficult to evaluate by visual observation because the scratches were small, and superiority or inferiority was not attached. On the other hand, in this example, different evaluation values could be calculated based on the integral value or the like.
From this, it can be seen that the defect evaluation apparatus 1 and the defect evaluation method of the present invention are particularly effective for the evaluation of defects such as fine scratches that are difficult to evaluate visually.

Even when the measurement angle α is fixed at 10 °, an evaluation value almost the same as that calculated based on the integral value is obtained.
From this, it can be seen that if the measurement angle α is appropriately set, the defects of the lens 100 can be efficiently evaluated appropriately without measuring the transmitted light in a wide measurement range for all the samples.

[Evaluation by lateral rotation]
Sample No. With respect to the lenses 100 of 1 to 3, the evaluation by the lateral rotation operation was performed.
FIG. 5 shows the intensity distribution of transmitted light with respect to the measurement angle α measured in the lateral rotation operation.
In FIG. 5, the vertical axis represents the relative intensity, and the horizontal axis represents the measurement angle α.
Based on the intensity distribution shown in FIG. 5, the integrated value of the intensity obtained in the range of the measurement angle α = 5 to 50 °, the intensity of the transmitted light at the measurement angle α = 10 °, and the evaluation value of the defect of the lens 100 based on these values. Is shown in Table 3 below. The evaluation value calculation criteria are the same as those in Table 2.

According to FIG. In 1 and 2, a peak of transmitted light intensity is seen near the measurement angle α = 10 °, and it is considered that the surface of the lens 100 is partially damaged.
When Table 1 and Table 3 are compared, there is a slight difference in evaluation values even for the same sample. This is considered due to the peak of transmitted light intensity.
From this, it is considered that it is appropriate to perform both the longitudinal rotation operation and the lateral rotation operation in order to evaluate the defects of the lens 100 without omission in consideration of the presence or absence of large scratches.

[Example 2]
Evaluation by the defect evaluation apparatus 1 and the defect evaluation method was performed on the lenses 100 of the visual evaluation 4 to 7 having a larger scratch 100A in the visual evaluation than that of Example 1 described above.
The evaluation was performed on three lenses 100 for each visual evaluation.
The material of the lens 100 is a plastic lens.

FIG. 6 shows the intensity distribution of the transmitted light with respect to the measurement angle α measured in the vertical rotation operation, and FIG. 7 shows the intensity distribution of the transmitted light with respect to the measurement angle α measured in the horizontal rotation operation. 6 and 7, the vertical axis represents the relative intensity, and the horizontal axis represents the measurement angle α.
In addition, the integrated values of the transmitted light intensities obtained in the range of the measurement angle α = 5 to 50 ° (−40 to 40 ° in the case of lateral rotation) are shown in FIGS. 8 and 9, and the intensity of the transmitted light at the measurement angle α = 10 °. Are summarized in FIG. 10 and FIG. 8 to 10, the bar graph shows the average value of the measured values (integrated value or transmitted light intensity) of three samples, and the vertical bar shows the distribution of the measured values of the three samples.

According to FIGS. 6, 8, and 10, it can be seen that the measurement value by the vertical rotation operation has a correlation with the visual evaluation.
Moreover, according to FIGS. 7, 9, and 11, it can be seen that the measured value by the lateral rotation operation has a correlation with the visual evaluation.
As described above, according to the defect evaluation apparatus 1 and the defect evaluation method of the present invention, it is understood that the defect of the lens 100 can be objectively and quantitatively evaluated even for the lens 100 having the relatively large scratch 100A.

  The present invention can be used as a lens defect evaluation apparatus and a lens defect evaluation method.

The figure which shows schematic structure of the fault evaluation apparatus of the lens which concerns on embodiment of this invention. Schematic which shows the positional relationship of a light source, a lens, and a light reception unit in the rotation light reception process of embodiment of this invention. The figure which shows rotation of the lens by the rotation means which concerns on the modification of embodiment of this invention. The figure which shows intensity distribution of the transmitted light with respect to the measurement angle measured in vertical rotation operation | movement. The figure which shows intensity distribution of the transmitted light with respect to the measurement angle measured in horizontal rotation operation | movement. The figure which shows intensity distribution of the transmitted light with respect to the measurement angle measured in vertical rotation operation | movement. The figure which shows intensity distribution of the transmitted light with respect to the measurement angle measured in horizontal rotation operation | movement. The figure which put together the integrated value of the transmitted light intensity measured in the vertical rotation operation | movement. The figure which put together the integrated value of the transmitted light intensity measured in horizontal rotation operation | movement. The figure which put together the transmitted light intensity measured in the measurement angle of 10 degrees by the vertical rotation operation. The figure which put together the transmitted light intensity measured in the measurement angle of 10 degrees by horizontal rotation operation. The figure which shows schematic structure of a general haze meter.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Defect evaluation apparatus, 11 ... Light source, 15 ... Measuring part, 16 ... Rotating means, 100 ... Lens, 143 ... Light receiving element

Claims (6)

A light source for irradiating light to a lens to be evaluated;
A light receiving element that receives transmitted light that has been irradiated from the light source and transmitted through the lens;
A measuring unit for measuring the intensity of the transmitted light received by the light receiving element;
Rotating means for rotating the light receiving element relative to the lens;
Output means for outputting the intensity of the transmitted light for each measurement angle, which is an angle formed by a measurement line connecting the rotation center of the light receiving element and the light receiving element, and the optical axis of the lens;
An apparatus for evaluating a defect of a lens, comprising: In the lens defect evaluation apparatus according to claim 1,
An arithmetic unit that calculates an evaluation value that evaluates the defect of the lens based on the intensity of the transmitted light for each measurement angle;
The lens defect evaluation apparatus, wherein the output means outputs the evaluation value calculated by the calculation unit. In the lens defect evaluation apparatus according to claim 2,
The computing unit is
Integrating the intensity of the transmitted light for each measurement angle over a pre-set angle range;
A lens defect evaluation apparatus, wherein the evaluation value is calculated based on the integral value. In the lens defect evaluation apparatus according to claim 2,
The lens calculation apparatus according to claim 1, wherein the calculation unit calculates the evaluation value based on an intensity of the transmitted light at a specific measurement angle set in advance. In the lens defect evaluation apparatus according to any one of claims 1 to 4,
The apparatus for evaluating a defect of a lens, wherein the rotating means rotates the light receiving element in two directions in which a rotation axis is orthogonal to each other. A light receiving operation for receiving light transmitted from the light source and transmitted through the lens by a light receiving element, and a rotational light receiving process for alternately or simultaneously performing a rotating operation for rotating the light receiving element relative to the lens;
A measurement process for measuring a measurement angle which is an angle formed by a measurement line connecting the rotation center of the light receiving element and the light receiving element and an optical axis of the lens, and an intensity of the transmitted light received in the light receiving operation; ,
An evaluation process for evaluating defects of the lens based on the intensity of the transmitted light at each measurement angle measured in the measurement process;
A method for evaluating a defect of a lens, comprising:

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