JP2023140751A - Lens inspection device - Google Patents

Abstract

To provide a technique that can reduce the falling of foreign matter and the adhesion of the foreign matter on a lens even when the foreign matter is generated in a drive portion that moves a camera.SOLUTION: A lens inspection device includes a lens holding portion 51, a first camera 611, a first drive portion 613, and a first arm 615. The lens holding portion 51 holds a lens 9. The first camera 611 images the lens 9 held by the lens holding portion 51. The first drive portion 613 is located below the lens holding portion 51 and moves the first camera 611. The first arm 615 couples the first camera 611 and the first drive portion 613.SELECTED DRAWING: Figure 2

Description

The disclosure herein relates to a lens inspection device.

Conventionally, lenses may be inspected based on images taken with a camera. For example, in Patent Document 1, an intraocular lens (500) is imaged from the Z direction and Y direction with two CCD cameras (50A, 50B), and the dimensions of the intraocular lens (500) are determined based on the obtained images. and optical properties are measured.

Patent Document 1 is provided with an X-axis motor (45a, 47a), a Y-axis motor (45b, 47b), and a Z-axis motor, and these drives move the CCD camera (50A, 50B) in X, Y, and Z directions. It is possible to move in any direction.

Japanese Patent Application Publication No. 2007-71638

However, if the camera is placed above the lens to be inspected and foreign matter is generated in the drive unit that moves the camera, there is a possibility that the foreign matter may fall and adhere to the lens to be inspected. When foreign matter adheres to a lens to be inspected, the lens may be contaminated, making it difficult to properly perform an inspection.

SUMMARY OF THE INVENTION An object of the present invention is to provide a technique that can reduce the possibility that even if a foreign object is generated in a drive unit that moves a camera, the foreign object will fall and adhere to a lens.

In order to solve the above problems, a first aspect is a lens inspection device, which includes a lens holding part that holds a lens, a camera that images the lens held in the lens holding part, and a camera held in the lens holding part. The camera is provided with a drive unit located below the lens to move the camera, and a connection unit that connects the camera and the drive unit.

A second aspect is the lens inspection apparatus of the first aspect, in which the camera is located above and apart from the lens holding section.

A third aspect is the lens inspection device according to the first aspect or the second aspect, including a housing part that can house the lens holding part, the camera, the driving part, and the connecting part, and a housing part that can house the lens holding part, the camera, the driving part, and the connecting part; an airflow generation section that generates an airflow from above the camera to a side below the camera; and an exhaust section that is located below the drive section and discharges air inside the accommodation section to the outside of the accommodation section. Furthermore, it is equipped with.

A fourth aspect is the lens inspection device according to the third aspect, wherein the lens holding section is movable between an imaging position and a carry-out position horizontally distant from the imaging position, and the camera is configured to The lens held by the lens holding part at the imaging position can be imaged, and the housing part has an exit for carrying out the lens from the lens holding part at the carrying out position.

A fifth aspect is the lens inspection device according to the fourth aspect, in which the accommodating section includes a first accommodating section that accommodates the camera, the lens holding section at the imaging position, the driving section, and the connecting section; a second housing part communicating with the first housing part, accommodating the lens holding part at the carry-out position, and having the discharge port, and the airflow generating part is located above the first housing part. do.

A sixth aspect is the lens inspection apparatus according to the fifth aspect, in which the outlet is located above the second storage section.

A seventh aspect is the lens inspection apparatus according to the fifth aspect or the sixth aspect, in which the exhaust section is located in the second housing section.

An eighth aspect is the lens inspection apparatus according to any one of the fifth to seventh aspects, wherein the exhaust section includes a first exhaust section located in the first housing section and a first exhaust section located in the second housing section. and a second exhaust section.

A ninth aspect is the lens inspection apparatus according to the eighth aspect, in which the amount of exhaust from the second exhaust section is larger than the amount of exhaust from the first exhaust section.

A tenth aspect is the lens inspection device according to any one of the fifth to ninth aspects, in which the upper part of the second housing part is located below the upper part of the first housing part.

An eleventh aspect is the lens inspection apparatus according to any one of the first to tenth aspects, further comprising an illumination section that illuminates the lens held by the lens holding section, and the driving section is configured to Move the lighting section.

According to the lens inspection apparatuses of the first to eleventh aspects, since the drive unit that moves the camera is located below the lens, foreign matter generated in the drive unit is reduced from falling and adhering to the lens. Ru. Therefore, lens contamination can be reduced.

According to the lens inspection device of the second aspect, the lens can be photographed from above. Furthermore, even if the camera is located above the lens, the drive section is located below the lens, so that it is possible to reduce the attachment of foreign matter generated in the drive section to the lens.

According to the lens inspection device of the third aspect, the foreign matter generated in the drive section can be discharged to the outside of the storage section by the exhaust section.

According to the lens inspection device of the fifth aspect, it is possible to reduce the possibility that foreign matter generated in the drive section rises and attaches to the lens.

According to the lens inspection device of the sixth aspect, the lens can be carried out from the lens holding part at the carrying out position via the carrying out port at the upper part of the second storage part.

According to the lens inspection device of the seventh aspect, the air can be exhausted in the second storage section. Thereby, airflow can be generated from the first housing part to the second housing part, so that air accumulation in the second housing part can be reduced.

According to the lens inspection device of the eighth aspect, air can be discharged from the first housing part and the second housing part.

According to the lens inspection device of the ninth aspect, air accumulation in the second storage portion can be reduced.

According to the lens inspection device of the tenth aspect, the airflow generated in the first housing section is directed toward the exhaust section of the second housing section, thereby reducing air accumulation near the top of the second housing section.

According to the lens inspection device of the eleventh aspect, the lens can be illuminated in accordance with the imaging conditions. Furthermore, even if foreign matter is generated from the drive unit by moving the illumination unit, it is possible to reduce the possibility that the foreign matter will adhere to the lens.

FIG. 1 is a perspective view of a lens inspection device according to an embodiment. FIG. 2 is a side view showing the inside of the housing section of the lens inspection device shown in FIG. 1. FIG. FIG. 2 is a plan view schematically showing the inside of the housing section of the lens inspection device shown in FIG. 1. FIG. FIG. 2 is a side view conceptually showing an airflow formed within the housing section of the lens inspection device shown in FIG. 1. FIG.

Embodiments of the present invention will be described below with reference to the accompanying drawings. Note that the components described in this embodiment are merely examples, and the scope of the present invention is not intended to be limited thereto. In the drawings, dimensions and numbers of parts may be exaggerated or simplified as necessary to facilitate understanding.

<1. Embodiment>
FIG. 1 is a perspective view of a lens inspection device 1 according to an embodiment. FIG. 2 is a side view showing the inside of the housing section 3 of the lens inspection apparatus 1 shown in FIG. FIG. 3 is a plan view schematically showing the inside of the housing section 3 of the lens inspection apparatus 1 shown in FIG.

In FIG. 1 and the subsequent figures, arrows indicating mutually intersecting X, Y, and Z axes may be illustrated. The X, Y and Z axes are preferably orthogonal. Furthermore, the direction toward which the tip of each arrow points is defined as the + (plus) side, and the side opposite to the + side is defined as the - (minus) side. In the following description, the direction along the Z-axis is defined as a vertical direction, and the directions along the X-axis and Y-axis are defined as horizontal directions parallel to the horizontal plane. Further, the +Z side will be described as the "upper side" and the -Z side will be described as the "lower side." However, these directions do not limit the positional relationship of the device configuration.

The lens inspection apparatus 1 is an apparatus that inspects a lens 9 as an inspection target based on images obtained by a first camera 611 and a second camera 621. The lens 9 is something that is worn on the eye, such as an intraocular lens or a contact lens. However, the lens 9 may be a lens other than a lens worn on the eye (for example, a lens that can be used in an optical device (such as a camera)).

As shown in FIGS. 1 and 2, the lens inspection apparatus 1 includes a housing section 3, an inspection section 5, a fan filter unit 7, and a control section 8.

The accommodating section 3 is a casing, and can accommodate the inspection section 5 therein. The accommodating part 3 has a first accommodating part 31 and a second accommodating part 33. The first accommodating part 31 and the second accommodating part 33 have a substantially rectangular parallelepiped shape. The second accommodating part 33 is located adjacent to the first accommodating part 31 on the +X side. The inside of the first accommodating part 31 communicates with the inside of the second accommodating part 33. The upper part 33u of the second accommodating part 33 is located below the upper part 31u of the first accommodating part 31.

As shown in FIG. 2, the second housing section 33 has a loading/unloading port 331 for loading and unloading the lens 9, and a shutter 333. The loading/unloading port 331 is located at the upper part 33u of the second storage section 33. The shutter 333 opens and closes the loading/unloading port 331. The shutter 333 is opened when inserting the lens 9 into the housing section 3 or when carrying out the lens 9 from the housing section 3. Furthermore, when inspecting the lens 9 within the housing section 3, the shutter 333 is closed.

As shown in FIG. 2, the inspection section 5 includes a lens holding section 51, a stage 53, a stage driving section 55, and a pedestal 57. Furthermore, the inspection section 5 includes a first camera 611, a first drive section 613, a first arm 615, and a first illumination section 617. Furthermore, the inspection section 5 includes a second camera 621, a second drive section 623, a second arm 625, and a second illumination section 627.

The lens holding section 51 holds the lens 9 that is the object of inspection. The lens holding part 51 has transparency. The lens holder 51 is attached to the upper surface of a substantially rectangular parallelepiped stage 53 via a support frame 511. As shown in FIG. 2, the lens inspection apparatus 1 includes a transmitted illumination section 513. The transmitted illumination section 513 is located below the lens holding section 51. The transmitted illumination section 513 illuminates the lens 9 held by the lens holding section 51 from the -Z side.

The stage drive unit 55 reciprocates the stage 53 in the X-axis direction along a guide rail (not shown) provided on the top surface of the pedestal 57 and extending in the X-axis direction. The stage driving section 55 moves the lens holding section 51 between the imaging position P1 and the loading/unloading position P2 by moving the stage 53 between the first housing section 31 and the second housing section 33. move it.

Further, the stage 53 is movable in the Y direction and rotatable in the θ direction around the axis by the stage drive unit 55. By moving the stage 53 in the Y direction and rotating in the θ direction, the position in the Y direction or the orientation in the θ direction of the lens 9 held by the lens holder 51 is adjusted as appropriate.

As shown in FIG. 2, the first camera 611 and the second camera 621 can image the lens 9 held by the lens holder 51 at the imaging position P1.

The loading/unloading port 331 is located directly above the lens holder 51 at the loading/unloading position P2. The lens 9 before inspection is placed in the lens holder 51 at the loading/unloading position P2 via the loading/unloading port 331. Further, the lens 9 that has been inspected is carried out from the lens holder 51 at the loading/unloading position P2 to the outside of the storage unit 3 via the loading/unloading port 331. The loading and unloading of the lens 9 may be performed by a machine such as a transfer robot, or may be performed manually.

The first camera 611 is located away from the lens holding section 51 at the imaging position P1 in the +Z direction. The first camera 611 images the top surface (+Z side surface) of the lens 9. The first camera 611 transmits the captured image to the control unit 8.

The first camera 611 is connected to the first drive unit 613 via a first arm 615 extending in the Z direction. The first arm 615 is a connecting part that connects the first camera 611 and the first driving part 613.

The first drive unit 613 moves the first camera 611. Specifically, the first drive unit 613 moves the first camera 611 in the Z direction by moving the first arm 615 in the Z direction. By moving the first camera 611 in the Z direction, the focal position of the first camera 611 is adjusted as appropriate in accordance with the lens 9 held by the lens holding section 51.

The second camera 621 is located away from the lens holding section 51 at the imaging position P1 in the −X direction. Further, the second camera 621 is located away from the lens holding section 51 at the imaging position P1 in the +Z direction. The second camera 621 images the side surface (−X side surface) of the lens 9. The second camera 621 transmits the captured image to the control unit 8.

The second camera 621 is connected to the second drive unit 623 via a second arm 625. The second arm 625 is a connecting portion that connects the second camera 621 and the second drive unit 623. The second drive unit 623 moves the second camera 621 by moving the second arm 625.

The second arm 625 extends from the second drive section 623 in the +Z direction. More specifically, the second arm 625 extends from the second drive section 623 in the +Z direction and the -X direction.

The second drive unit 623 moves the second camera 621 by moving the second arm 625. For example, the second drive unit 623 rotates the second arm 625 by a predetermined angle about a predetermined axis parallel to the Y direction. As a result, the tilt angle of the second camera 621 (the angle α between the optical axis OA of the second camera 621 and the horizontal axis) is adjusted. Further, the second drive unit 623 moves the second camera 621 in the approaching and separating directions. The approach/separation direction is a direction in which the second camera 621 approaches the lens holder 51 and a direction in which the second camera 621 moves away from the lens holder 51. The approaching and separating direction is, for example, a direction along the optical axis OA of the second camera 621. In the example shown in FIG. 2, the contact/separation direction is inclined toward the −Z side toward the +X direction. Further, as shown in FIG. 3, the second drive unit 623 moves the second arm 625 in the Y direction.

The first drive unit 613 and the second drive unit 623 are actuators, and include a drive source such as a motor or a piston, a conversion mechanism that converts the motion of the drive source into motion in a desired direction, and a guide member that defines the direction of movement. It consists of The conversion mechanism includes, for example, a ball screw and a rack and pinion. When the first drive unit 613 and the second drive unit 623 operate, foreign matter (dust) may be generated due to sliding of members (for example, sliding on a motor bearing, sliding on a conversion mechanism or a guide member, etc.). be.

As shown in FIG. 2, the first drive section 613 and the second drive section 623 are located below the upper end of the lens holding section 51. In other words, the first drive section 613 and the second drive section 623 are located below the lens 9 with the lens holding section 51 holding the lens 9 . Therefore, even if foreign matter occurs in the first drive section 613 and the second drive section 623, it is possible to reduce the possibility that the foreign matter will fall and adhere to the lens 9. Therefore, contamination of the lens 9 can be reduced.

As shown in FIG. 2, the first illumination section 617 is located away from the lens holding section 51 at the imaging position P1 in the +Z direction. The first illumination unit 617 illuminates the lens 9 held by the lens holding unit 51 at the imaging position P1 from the +Z side.

The first illumination unit 617 is connected to the first camera 611. That is, the first lighting section 617 is connected to the first driving section 613 via the first camera 611 and the first arm 615. Therefore, the first illumination section 617 moves together with the first camera 611 by driving the first driving section 613.

As shown in FIG. 2, the second illumination section 627 is located away from the lens holding section 51 at the imaging position P1 in the +Z direction and the -X direction. The second illumination section 627 illuminates the lens 9 held by the lens holding section 51 at the imaging position P1 from the -X side.

The second illumination unit 627 is connected to the second camera 621. That is, the second lighting section 627 is connected to the second driving section 623 via the second camera 621 and the second arm 625. Therefore, the second illumination section 627 moves together with the second camera 621 by the drive of the second driving section 623.

Note that in the lens inspection apparatus 1, it is not essential that the first illumination unit 617 be moved by the first drive unit 613 that moves the first camera 611. For example, the first lighting section 617 may be moved by a lighting driving section different from the first driving section 613. The second camera 621 may also be moved by a lighting drive unit different from the second drive unit 623. When providing an illumination drive section, the illumination drive section is preferably arranged below the lens holding section 51 at the imaging position P1. Thereby, even if foreign matter is generated in the illumination drive section, it is possible to reduce the amount of foreign matter adhering to the lens 9.

As shown in FIGS. 1 and 2, the fan filter unit (hereinafter referred to as "FFU") 7 is located at the upper part 31u of the first housing part 31. The FFU 7 uses a filter to purify the air taken in from outside the housing section 3 and supplies the purified air into the housing section 3 . The FFU 7 forms a downflow within the housing section 3 . Specifically, the FFU 7 generates an airflow from above the first camera 611 to below the first camera 611. The FFU 7 is an example of an airflow generator. Since the FFU 7 forms a downflow, even if foreign matter is generated in the first drive section 613 and the second drive section 623, the rise of the foreign matter can be suppressed, so that contamination of the lens 9 can be reduced. Further, since the downflow can suppress the rise of foreign substances that may be generated from the stage 53, contamination of the lens 9 can be reduced.

As shown in FIG. 1, the lens inspection apparatus 1 includes a first exhaust section 35 and a second exhaust section 37. The first exhaust section 35 and the second exhaust section 37 exhaust the air inside the housing section 3 to the outside of the housing section 3 . The first exhaust section 35 is located below the first housing section 31 . The second exhaust section 37 is located below the second housing section 33. The first exhaust section 35 and the second exhaust section 37 are located below the first drive section 613 and the second drive section 623.

The first exhaust section 35 has a plurality of exhaust ports 351 formed at equal intervals in the X direction. The plurality of exhaust ports 351 are located on the −Y side, the +Y side, and the −X side of the first housing portion 31, respectively. Each exhaust port 351 is a through hole that penetrates the first housing portion 31 .

The second exhaust section 37 has a plurality of exhaust ports 371 and a plurality of exhaust ports 373. The plurality of exhaust ports 371 are located on the −Y side and the +Y side of the second housing portion 33, respectively. Further, the plurality of exhaust ports 373 are located on the +X side side of the second accommodating portion 33. Each exhaust port 371 and each exhaust port 373 are through holes that penetrate the second accommodating portion 33.

FIG. 4 is a side view conceptually showing the airflow formed in the housing section 3 of the lens inspection apparatus 1 shown in FIG. 1. As shown in FIG. 4, the upper part 33u of the second accommodating part 33 is located below the upper part 31u of the first accommodating part 31. Therefore, simply by forming a downflow in the first accommodating part 31, it is difficult to form an airflow near the upper part 33u of the second accommodating part 33. On the other hand, since the lens inspection apparatus 1 has the second exhaust part 37 in the second housing part 33, as shown in FIG. It can be guided toward the storage section 33 side and can be efficiently discharged from the second exhaust section 37. Therefore, air accumulation in the second accommodating portion 33 can be suppressed.

The opening area of the exhaust ports 371 and 373 of the second exhaust section 37 may be larger than the opening area of the exhaust port 351 of the first exhaust section 35. Thereby, the second exhaust section 37 can exhaust more air than the first exhaust section 35. In this case, as shown in FIG. 4, air flow can be well guided from the first housing part 31 side to the second housing part 33 side, so that air accumulation near the upper part 33u of the second housing part 33 can be reduced.

By providing a plurality of exhaust ports 373, air can be efficiently exhausted even in the lower part of the +X side of the second housing part 33 that is remote from the FFU 7. Further, the opening area of the exhaust port 373 may be larger than the opening area of the exhaust port 371. As a result, the amount of air discharged from the exhaust port 373 (the amount of air discharged per unit time) can be made larger than the amount of air discharged from the exhaust port 371. Therefore, it is possible to effectively reduce air accumulation on the +X side side of the second housing portion 33.

The control unit 8 includes a storage device, a processing circuit, an input device, and an output device. Storage devices include, for example, hard disk drives (HDD), random access memory (RAM), read-only memory (ROM), flash memory, volatile or nonvolatile semiconductor memory, magnetic disks, flexible disks, optical disks, compact disks, mini disks, etc. It consists of a memory (storage medium) including a disk or DVD. The processing circuit includes, for example, a central processing unit (CPU) that executes a program stored in a storage device. The input device is configured of a device capable of inputting information, such as a mouse, keyboard, touch panel, or various switches. The output device is constituted by a device capable of outputting information, such as a display, a liquid crystal display, or a lamp.

The control unit 8 controls each drive unit included in the lens inspection device 1. For example, the control unit 8 moves the first camera 611 by controlling the first drive unit 613. Further, the control unit 8 moves the second camera 621 by controlling the second drive unit 623. Further, the control section 8 moves the stage 53 and the lens holding section 51 by controlling the stage driving section 55. Further, the control unit 8 controls opening and closing of the shutter 333 and controls the FFU 7 .

The control unit 8 controls the positions of the first camera 611 and the second camera 621 by controlling the first drive unit 613 and the second drive unit 623 based on the images acquired by the first camera 611 and the second camera 621. may be adjusted. Further, the control unit 8 performs an external appearance inspection of the lens 9 based on images acquired by the first camera 611 and the second camera 621. The appearance inspection is performed, for example, by comparing the images obtained by the first camera 611 and the second camera 621 with a previously prepared image of the lens 9 with no defects (a so-called non-defective image) to check for scratches and scratches on the lens 9. It may also be used to detect defects such as foreign objects. In addition, the appearance inspection calculates the pixel value, brightness value, etc. for each pixel in the images acquired by the first camera 611 and the second camera 621, and detects defects in the lens 9 based on predetermined conditions regarding these values. It may also be something that detects. Moreover, the visual inspection may be one in which the control unit 8 displays images acquired by the first camera 611 and the second camera 621 on an output device, and the operator visually observes the displayed images.

The control unit 8 may measure the dimensions of the lens 9 based on images acquired by the first camera 611 and the second camera 621. For example, when the lens 9 is an intraocular lens, as described in Patent Document 1, the optical part diameter, total length, effective optical part diameter, optical part center, support part angle, sagitta, vault height, and optical part center Thickness etc. may be measured.

Although this invention has been described in detail, the above description is illustrative in all aspects, and the invention is not limited thereto. It is understood that countless variations not illustrated can be envisaged without departing from the scope of the invention. The configurations described in each of the above embodiments and modified examples can be appropriately combined or omitted as long as they do not contradict each other.

1 Lens inspection device 3 Housing section 7 Fan filter unit (airflow generation section)
9 Lens 31 First storage section 33 Second storage section 35 First exhaust section 37 Second exhaust section 51 Lens holding section 53 Stage 55 Stage drive section 331 Input/export port 611 First camera 613 First drive section 615 First arm (Connection part)
617 First illumination section 621 Second camera 623 Second drive section 625 Second arm (connection section)
627 Second lighting section

Claims (11)

A lens inspection device,
a lens holding section that holds the lens;
a camera that captures an image of the lens held by the lens holding section;
a drive unit located below the lens held by the lens holding unit and for moving the camera;
a connecting part that connects the camera and the driving part;
A lens inspection device comprising: The lens inspection device according to claim 1,
In the lens inspection device, the camera is located above and apart from the lens holding section. The lens inspection device according to claim 1 or 2,
an accommodating section capable of accommodating the lens holding section, the camera, the driving section, and the connecting section;
an airflow generating section that generates an airflow from above the camera to below the camera in the housing section;
an exhaust section that is located below the drive section and discharges air in the accommodation section to the outside of the accommodation section;
A lens inspection device further comprising: The lens inspection device according to claim 3,
The lens holder is movable between an imaging position and a carry-out position horizontally distant from the imaging position,
The camera is capable of capturing an image of the lens held by the lens holding section at the imaging position,
A lens inspection device, wherein the storage section has an exit for carrying out the lens from the lens holding section at the carrying-out position. The lens inspection device according to claim 4,
The accommodating part is
a first accommodating section that accommodates the camera, the lens holding section at the imaging position, the driving section, and the connecting section;
a second accommodating part communicating with the first accommodating part, accommodating the lens holding part at the carrying out position, and having the carrying out port;
has
In the lens inspection device, the airflow generating section is located above the first housing section. The lens inspection device according to claim 5,
In the lens inspection device, the outlet is located above the second housing part. The lens inspection device according to claim 5 or 6,
In the lens inspection device, the exhaust section is located in the second housing section. The lens inspection device according to any one of claims 5 to 7,
A lens inspection apparatus, wherein the exhaust section includes a first exhaust section located in the first housing section and a second exhaust section located in the second housing section. The lens inspection device according to claim 8,
A lens inspection apparatus, wherein an exhaust amount from the second exhaust section is larger than an exhaust amount from the first exhaust section. The lens inspection device according to any one of claims 5 to 9,
A lens inspection device, wherein an upper part of the second accommodating part is located below an upper part of the first accommodating part. The lens inspection device according to any one of claims 1 to 10,
an illumination unit that illuminates the lens held by the lens holding unit;
Furthermore,
The driving section is a lens inspection device that moves the illumination section.

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