JPH11337320A - Automatic projector inspecting device for in traocular lens and method for inspecting intraoccular lens using the same device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an automatic projector inspecting device capable of automatically inspecting the appearance of an intraocular lens, and a method for inspecting the intraocular lens using this device. SOLUTION: This automatic projector inspecting device is provided with a low magnification microscope 1 for observing the whole image of the intraocular lens, high magnification microscope 2 for observing the partial image of the intraocular lens by enlarging it, CCD camera 3, stage part 4 for three-dimensionally moving at least the high magnification microscope 2, motor driver 5 for driving the stage part 4, auto-focus part 6 for focusing the high magnification microscope 2, image processing part 7 for calculating the measured width of a prescribed part of the intraocular lens from the whole image and partial enlarged image of the intraocular lens obtained through the CCD camera 3, and a light source 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to an automatic projector inspection apparatus and an intraocular lens inspection method using the same. More specifically, the present invention relates to an automatic projector inspection apparatus capable of automatically inspecting the appearance of an intraocular lens and an intraocular lens inspection method using the same.

[0002]

2. Description of the Related Art Conventionally, an intraocular lens has been used for correcting the visual acuity by removing the lens of a cataract patient, inserting the lens into the eye, and implanting the lens in the eye. For the intraocular lens, it is necessary to perform various standard inspections on the dimensions of the intraocular lens in order to satisfy the standards set forth in the Intraocular Lens Approval Standard of the Ministry of Health and Welfare.

The items of the standard inspection on dimensions include the total length of the intraocular lens, the diameter of the optical part, the width of the support part, the thickness of the center of the optical part, the support part angle, the effective optical part diameter, the vault height, the sagittar, the major diameter of the ellipse, There are twelve items of the minor axis of the ellipse, the ridge width and the ridge height.

As shown in FIG. 2, the entire length L of the intraocular lens 31 is a major axis including the support portion 33, the optical portion diameter D is the diameter of the optical portion 32, and the support portion width W is the support portion 33. Is the width of

As shown in FIG. 3, the center thickness T ₁ of the optical unit is the thickness at the center of the optical unit 32, and the angle θ of the support unit is inclined with respect to a plane orthogonal to the optical axis direction. It is.

As shown in FIG. 4, when the intraocular lens 31 has a positioning hole 34 in the optical unit 32, the effective optical unit diameter AD is equal to the diameter of the optical unit 32 not including the positioning hole 34. That means.

Further, as shown in FIG. 5, the vault height B is perpendicular to the optical axis and is the height from the tip of the support portion 33 to the front surface of the optical portion 32. Sagitta S is a height from a plane perpendicular to the optical axis and including the foremost part and a plane including the last part. The definitions of the vault height B and the sagitta S are based on the intraocular lens approval standard.

When the optical section has an elliptical optical section, the major axis and the minor axis of the ellipse of the optical section are measured.

Further, as shown in FIG. 3, the ridge is a projection attached to the rear surface of the optical section, and the width of the projection is called a ridge width RW, and the height is called a ridge height RH.

Conventionally, when the above twelve inspection items are inspected, the inspection is performed as follows.

The total length L of the intraocular lens 31 and the optical part diameter D
When inspecting the support portion width W, the inspector performs the inspection by manually operating the projector 41 (for example, a universal projector V-12A (manufactured by Nikon Corporation)) shown in FIG. In FIG. 6, first, a plurality of intraocular lenses are set on the stage 42 by fixing them to a measuring jig or the like. Then, the outer peripheral surface of the intraocular lens is focused, and then enlarged and projected on the screen 43 (specifically, about 20 times for the entire length and the optical part diameter, and about 100 times for the support part width). The image of the intraocular lens whose magnification has been adjusted in two steps is measured using a scale (that is, a dedicated ruler set on the screen 43), so that the overall length L of the intraocular lens 31 and the optical The part diameter D and the support part width W are obtained, and it can be checked whether the diameters are within the range of the standard.

When the support part angle θ is to be inspected, the intraocular lens is placed horizontally on a dedicated examination table or the like, and a comparative inspection is performed by visual inspection with the intraocular lens serving as a reference for the non-defective product.

When inspecting the center thickness T ₁ of the optical part, a contact inspection is performed using a micrometer or the like.

Other test items (effective optical part diameter, vault height, sagitter, diameter of ellipse, minor axis of ellipse, ridge width and ridge height) were not inspected.

[0015]

However, when inspecting the total length L, the optical part diameter D, and the support part width W of the intraocular lens 31 using the projector 41 shown in FIG. Therefore, when reading the scale on the scale, the examiner needs to convert the magnification at the present time for each measurement, and there is a problem that a measurement error easily occurs.

When performing the measurement, the screen 43
The intraocular lens on the stage 42 is aligned so that the image of the upper intraocular lens can be measured on the scale (specifically, the X-axis stage 44 and the Y-axis stage 45 are operated to adjust the intraocular lens). To move).

In addition, since the projector 41 is manually operated for measurement and inspection, there is a problem that the user has a high level of skill.

Furthermore, since the measurement and inspection are performed by manually operating the projector 41, there is a problem that individual differences (individual differences such as focusing, scale reading, etc.) are likely to occur in the measured values.

On the other hand, with regard to the support portion angle, since the intraocular lens for reference of the support portion angle conforming product limit and the intraocular lens to be inspected are visually compared and inspected, it is only possible to judge whether the product is good or defective. Can not. In addition, such an inspection of the support portion angle has a problem that an error occurs depending on the reading angle.

In addition, there is a problem that the surface of the intraocular lens is scratched or stained due to the contact inspection at the optical part center thickness.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and an object of the present invention is to provide an automatic projector inspection apparatus capable of automatically inspecting the appearance of an intraocular lens and an intraocular lens inspection method using the same. Aim.

[0022]

According to the present invention, there is provided an automatic projector inspection apparatus comprising: (a) a low-power microscope for observing an entire image of an intraocular lens; and (b) an image of the portion of the intraocular lens. (C) a CCD camera attached to the low-magnification microscope and the high-magnification microscope;
An X-axis stage, a Y-axis stage, and a Z for moving at least the high-magnification microscope three-dimensionally to predetermined coordinates
A stage section having an axis stage; (e) a motor driver for driving the X-axis stage, Y-axis stage and Z-axis stage of the stage section, respectively; An autofocus unit for focusing on an image of a part; and (g) measuring a measurement width of a predetermined portion of the intraocular lens from an entire image and a partially enlarged image of the intraocular lens obtained by the CCD camera. And (h) a light source for inputting an image of at least the entire image of the intraocular lens with a predetermined brightness or more.

Preferably, the apparatus further comprises an input unit for inputting design value data and inspection items of the intraocular lens from an external device before measurement, and a transmission unit for transmitting measurement data after measurement to the external device. .

It is preferable that the apparatus further comprises a monitor for observing the whole image and the partially enlarged image of the intraocular lens obtained by the CCD camera.

The inspection items include the total length of the intraocular lens, the diameter of the optical part, the width of the support part, the thickness of the center of the optical part, the angle of the support part, the effective optical part diameter, the vault height, the sagittar, the major axis of the ellipse, the minor axis of the ellipse, It is preferable that at least one is selected from the ridge width and the ridge height.

An inspection method according to the present invention is an inspection method for an intraocular lens using the automatic projector inspection apparatus, wherein (a) a step of installing an intraocular lens at a predetermined position of the automatic projector inspection apparatus (B) observing the whole image of the intraocular lens with a low magnification microscope, and (c) inputting the whole image of the intraocular lens obtained in step (b) to an image processing unit through a CCD camera. (D) by the image processing unit,
Measurement coordinates based on the entire image of the intraocular lens and at least one measurement value of the total length of the intraocular lens, the optical part diameter, the effective optical part diameter, the major axis of the ellipse, and the minor axis of the ellipse, which are the first inspection items. Calculating; (e) moving a high-power microscope to the measurement coordinates; (f) focusing an image of the intraocular lens in the high-power microscope; (g) the image The processing unit controls the second inspection item based on the image of the portion of the intraocular lens, such as the support portion width, the optical portion center thickness, the support portion angle, the vault height, the sagitter, the ridge width, and the ridge height of the intraocular lens. Calculating at least one measurement value.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an automatic projector inspection apparatus and an inspection method using the same according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic perspective explanatory view showing an embodiment of an automatic projector inspection apparatus according to the present invention.

The automatic projector inspection apparatus shown in FIG. 1 includes a low-magnification microscope 1, a high-magnification microscope 2, a CCD camera 3, and a stage unit 4 so that the appearance of an intraocular lens can be automatically inspected. , A motor driver 5, an autofocus unit 6, an image processing unit 7, and a light source 8.
The low-magnification microscope 1, the high-magnification microscope 2, and the CCD camera 3 are supported by a stage unit 4 so as to be movable three-dimensionally, and the stage unit 4 is fixed to a fixed base (not shown).
Etc. are fixed. Below the low-magnification microscope 1 and the high-magnification microscope 2, a stage 9 for mounting the intraocular lens 31 is arranged.

The low-magnification microscope 1 is for observing the entire image of the intraocular lens 31. The magnification is such that the monitor 12 can capture the entire image of the intraocular lens 31 (preferably within 1 ×). And a CCD camera 3 is mounted on the eyepiece side.

The high-magnification microscope 2 is for magnifying and observing an image of the portion of the intraocular lens 31, and has a magnification of 10%.
It is an optical microscope of about 20 times, and CC on the eyepiece side
A D camera 3 is attached.

The CCD camera 3 is attached to the low-magnification microscope 1 and the high-magnification microscope 2, respectively, and is electrically connected to the image processing unit 7.

The stage section 4 includes an X axis stage 4x, a Y axis stage 4y, and a Z axis stage 4z for moving the low magnification microscope 1 and the high magnification microscope 2 to predetermined coordinates three-dimensionally. . The stage unit 4
At least the high-magnification microscope 2 need only be movably supported, and the low-magnification microscope 1 may be fixed at a position above the stage 9.

The motor driver 5 is for driving the X-axis stage 4x, the Y-axis stage 4y and the Z-axis stage 4z of the stage unit 4, respectively.

The auto-focus unit 6 enlarges the high-magnification microscope 2 by partially enlarging the image of a predetermined portion of the intraocular lens 31 (for example, when measuring the support portion width W shown in FIG. 2). (Focused image).

The image processing section 7 measures the measurement width of a predetermined portion of the intraocular lens 31 from the whole image and the partially enlarged image of the intraocular lens 31 obtained by the CCD camera 3 (for example, as shown in FIG. 2). (For example, support portion width W).

The motor driver 5, the autofocus unit 6, and the image processing unit 7 are controlled by a controller 11 including a CPU of a personal computer so as to operate according to the procedure of the appearance inspection described later.

The light source 8 converts the whole image and the partially enlarged image of the intraocular lens 31 to a predetermined brightness or more (preferably 300
(About lux or more) for clear image input, and are introduced into the optical paths of the low-magnification microscope 1 and the high-magnification microscope 2 through the light introduction ports 1a and 2a, respectively.
The light source 8 only needs to supply light to the low-magnification microscope 1 so that an image of at least the entire image of the intraocular lens 31 can be input with a predetermined brightness or more.

FIG. 1 shows an intraocular lens 31 before measurement.
Since the controller 11 has a function of an input unit for inputting the design value data and the inspection items from the external device and a transmission unit for transmitting the measured data after the measurement to the external device A, the inspection items can be changed or the measurement data can be changed. Can be quickly grasped. In addition, the controller 11 of FIG.
Although it has both functions of the input unit and the transmission unit, the input unit and the transmission unit may be provided separately.

Further, since the monitor 12 is connected to the image processing section 7, the inspector can observe the whole image and the partially enlarged image of the intraocular lens 31 obtained by the CCD camera 3.

The inspection items include the total length of the intraocular lens,
Optical part diameter, support part width, optical part center thickness, support part angle, effective optical part diameter, vault height, sagitter, elliptical major diameter,
At least one of the twelve items of the minor axis of the ellipse, the ridge width, and the ridge height may be selected, and all twelve items may be selected.

When the appearance inspection of the intraocular lens 31 is automatically performed by using the automatic projector inspection apparatus shown in FIG.
Basically, the procedure is as follows.

First, the intraocular lens 31 is installed at a predetermined position of the automatic projector inspection device. In the case of FIG. 1, the plurality of intraocular lenses 31 are fixed to the lens mounting jig 15, and the lens mounting jig 15 is fixed to the stage 9. The entire image of the intraocular lens 31 is observed with the low magnification microscope 1. The whole image of the intraocular lens 31 obtained in the process is CCD
The image is input to the image processing unit 7 by the camera 3. The image processing unit 7 calculates measurement coordinates based on the entire image of the intraocular lens 31 and measurement values of the first inspection item. Here, the first inspection item is an inspection item obtained from the entire image of the intraocular lens 31. Specifically, the first inspection item is the total length, the optical part diameter, the effective optical part diameter, the major axis of the ellipse, and the ellipse. It is at least one of the five items of the minor axis. Here, the measurement coordinates are the two coordinates necessary for measuring a second inspection item described later in the entire image of the intraocular lens 31.
It means dimensional coordinates (x, y). For example, the measurement coordinates for the optical unit center thickness are the two-dimensional coordinates of the center of the optical unit. The high magnification microscope 2 is moved to the measurement coordinates. The high magnification microscope 2 focuses the image of the portion of the intraocular lens 31. Specifically, from the measurement coordinates, a focus surface is detected by the auto focus unit 6,
The three-dimensional coordinates (x, y, z) on the focus plane are obtained. The image processor 7 calculates the measurement value of the second inspection item based on the image of the portion of the intraocular lens 31 using the calculation formula for each inspection item. Here, the second inspection item is an item obtained from an image of the portion of the intraocular lens 31, and specifically, a support portion width, an optical portion center thickness, a support portion angle, a vault height, It is at least one of seven items of sagitta, ridge width and ridge height.

The calculation formula is as follows. Support part width, ridge width = measured value in image processing part 7 × coefficient (coefficient: mm / Pixel) The optical part center thickness is defined as a plane perpendicular to the optical axis and including the front surface of the optical part and the plane including the rear surface of the optical part. Distance. Optical part center thickness = measured value at autofocus unit 6 × coefficient (coefficient: mm / Pulse) Ridge height = measured value at autofocus unit 6 × coefficient (coefficient: mm / Pulse) Vault height B is at the center of the optical unit. The distance between a plane P passing through the vertex and perpendicular to the Z-axis: Z-Z _O = 0 and the coordinates F (X _F , Y _F , Z _F ) of the vault height measurement position is the vault height, and B = | Z _F − Z _O | Sagitta = Optical part center thickness + Vault height The support part angle θ is determined as follows.

Two points on the supporting portion are represented by P (X _P , Y _P , Z _P ),
Assuming that Q (X _Q , Y _Q , Z _Q ), on the XY plane, the intersection point of the circle OQ and the line OQ with the radius OP at the center of the optical unit center coordinate O (X _O , Y _O ) is P ′ ( _{X P ', Y P',} ' _{When), | X P' Z P} -X O | = OP | X Q -X O | / OQ | Y P '-Y O | = OP | Y Q -Y O | / OQ Z _P ′ = Z _P Two points P ′ (X _P ′, Y _P ′, Z _P ′), Q (X _Q , Y _Q ,
The equation of a straight line S passing through Z _Q ) is

[0045]

(Equation 1)

1 = X _P ′ −X _Q , m = Y _P ′ −Y _Q , n = Z _P ′ −Z _Q α = X _Q , β = Y _Q , γ = Z _{Q The} plane P and the straight line S The angle θ, that is, the support portion angle θ is

[0047]

(Equation 2)

According to the procedures of the above inspection methods 1 to 12, it is possible to automatically inspect 12 inspection items related to the appearance inspection of the intraocular lens. Here, two methods are possible as data input / output methods.

(1) The first method is a method that does not use an external device, and automatically selects an inspection item from the inspection items (both the first and second inspection items) to execute the inspection. Perform (ie, no data entry) and output the measured values obtained. The advantages of this method are that it can be used even if an external device fails, that it can be used for measurements that do not require data management (such as a test lens), and that measurement items can be changed on the spot. It is. (2) The second method is a method using an external device,
The standard data of the intraocular lens to be inspected from the external device is input to the controller 11, and the inspection data obtained by the inspection is transmitted to the external device. The advantages of this method are that the input of inspection data is accurate, that the data can be centrally managed, that there is no need for human work, that automation and continuous work are possible.

[0050]

According to the present invention, it is possible to quantitatively measure and inspect the appearance of an intraocular lens without artificial errors.

Although the conventional projector can perform only two-dimensional measurement and inspection, the automatic projector inspection apparatus of the present invention can perform three-dimensional measurement and inspection.

Further, when the automatic projector inspection apparatus of the present invention is used, the inspection is automatically performed sequentially on 12 inspection items, so that the inspection time can be greatly reduced.

In particular, the advantages of the automatic projector inspection apparatus of the present invention include: (1) positioning of the intraocular lens is not required, such as placing the intraocular lens on a dedicated inspection apparatus for each inspection item. High accuracy. (2) Since the measurement error when repeatedly measuring the same intraocular lens is minimized, the repeatability is high. (3) The inspection time can be shortened, and the operation can be performed for 24 hours, thereby improving the productivity. (4) Since there is no individual difference and no reading error, skill is not required. (5) Since measurement accuracy is high, measurement errors are reduced, and quality can be made uniform. Further, the measurement result can be calculated in more detail than before. (6) Since an accurate inspection item is selected, it is not necessary to confirm the inspection item for each lens model. (7) The measurement position of each intraocular lens can be grasped. Moreover, even when the measurement is performed for each part of the intraocular lens using the high-power microscope, the high-power microscope can be accurately moved to the measurement position. (8) Since it is a non-contact inspection and does not require replacement of the intraocular lens, the intraocular lens is not affected by scratches or dirt. (9) The measurement in the plane direction and the measurement in the height direction can be simultaneously performed by one inspection apparatus. (10) Since manual work is eliminated, labor saving and unmanned operation are possible. (11) Since information can be online, centralized management of information is possible. (12) Based on the measurement results, it is possible to automatically and accurately discriminate non-defective products and defective products.

[Brief description of the drawings]

FIG. 1 is a schematic perspective explanatory view showing an embodiment of an automatic projector inspection apparatus according to the present invention.

FIG. 2 is a plan view of an example of an intraocular lens.

FIG. 3 is a side view of the intraocular lens of FIG.

FIG. 4 is a plan view of another example of the intraocular lens.

5 is a side view of the intraocular lens of FIG.

FIG. 6 is a perspective view of a projector for inspecting an intraocular lens.

[Explanation of symbols]

 Reference Signs List 1 Microscope for low magnification 2 Microscope for high magnification 3 CCD camera 4 Stage unit 5 Motor driver 6 Autofocus unit 7 Image processing unit 8 Light source

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Kiyohiko Ota 2--22-14 Noritake Shinmachi, Nishi-ku, Nagoya City, Aichi Prefecture Inside Menicon Noritake Plant (72) Inventor Junichi Shimoda 2--22 Noritake Shinmachi, Nishi-ku, Nagoya City, Aichi Prefecture No. 14 Inside Menicon Noritake Plant (72) Inventor Nagai Shigeki 5-1-1 Takamoridai, Kasugai City, Aichi Prefecture Inside Menicon Research Institute, Inc. (72) Inventor Kenichiro Shimojo 6-1 Sakaemachi, Tachikawa-shi, Tokyo 3-502 Tachihi Building Inside Flowbell Co., Ltd.

Claims (5)

[Claims] 1. A low-power microscope for observing the whole image of an intraocular lens, (b) a high-power microscope for enlarging and observing an image of a part of the intraocular lens, and (c) the low-power microscope A CCD camera attached to the microscope and the high-power microscope;
(D) a stage unit including at least an X-axis stage, a Y-axis stage, and a Z-axis stage for moving the high-magnification microscope three-dimensionally to predetermined coordinates; and (e) an X-axis stage of the stage unit. A motor driver for driving the Y-axis stage and the Z-axis stage, respectively;
(F) an autofocus unit for focusing the high-power microscope on an image of a portion of the intraocular lens;
(G) an image processing unit for calculating a measurement width of a predetermined portion of the intraocular lens from the whole image and the partially enlarged image of the intraocular lens obtained by the CCD camera;
(H) an automatic projector inspection apparatus comprising a light source for inputting at least a whole image of the intraocular lens with a predetermined brightness or more. 2. An apparatus according to claim 1, further comprising: an input unit configured to input design value data and inspection items of the intraocular lens from an external device before measurement, and a transmission unit configured to transmit measurement data after measurement to the external device. Item 2. The automatic projector inspection device according to Item 1. 3. The automatic projector inspection apparatus according to claim 1, further comprising a monitor for observing an entire image and a partially enlarged image of the intraocular lens obtained by the CCD camera. 4. The inspection items include an overall length of an intraocular lens, an optical part diameter, a support part width, an optical part center thickness, a support part angle, an effective optical part diameter, a vault height, a sagitta, an ellipse major axis, and an ellipse minor. 3. The automatic projector inspection device according to claim 2, wherein at least one is selected from a diameter, a ridge width, and a ridge height. 5. An intraocular lens inspection method using the automatic projector inspection apparatus according to claim 1, wherein (a) installing the intraocular lens at a predetermined position of the automatic projector inspection apparatus. (B) observing the whole image of the intraocular lens with a low magnification microscope, and (c) inputting the whole image of the intraocular lens obtained in step (b) to an image processing unit through a CCD camera. (D) measuring coordinates based on the entire image of the intraocular lens and the first inspection item, such as the total length, the optical part diameter, the effective optical part diameter, and the major axis of the ellipse of the intraocular lens, which are the first inspection items; And calculating at least one measurement value of the minor axis of the ellipse; (e) moving a high-power microscope to the measurement coordinates; (f) an image of the intraocular lens portion in the high-power microscope. Focusing; and (g) the image The processing unit controls the second inspection item based on the image of the portion of the intraocular lens, such as the support portion width, the optical portion center thickness, the support portion angle, the vault height, the sagitter, the ridge width, and the ridge height of the intraocular lens. Calculating at least one measurement value of the intraocular lens.