JP5400605B2 - Diaphragm inspection method and endoscope apparatus - Google Patents

Description

  The present invention relates to a diaphragm inspection method and an endoscope apparatus to which the inspection method can be applied.

2. Description of the Related Art Conventionally, in order to observe the inside of a subject, an endoscope apparatus that transmits an image inside the subject to the outside of the subject and observes the inside of the subject is known. Such an endoscope apparatus includes an optical system that is used by being inserted into a subject.
As an example of such an endoscope apparatus, Patent Document 1 discloses an endoscope apparatus provided with a variable diaphragm for adjusting the amount of light transmitted through the optical path of an optical system.

JP-A-4-208915

  In order to inspect the shape of an aperture such as the aperture described in Patent Document 1, generally, the aperture is observed with a microscope or the like from the object side in the optical system through a lens or the like. . Further, for the purpose of accurately inspecting the shape of the aperture of the aperture, it may be possible to take out the aperture from a device such as an endoscope device. However, in this case, since the diaphragm is removed from the drive mechanism for driving the diaphragm and the housing of the endoscope apparatus, the shape and position of the opening of the diaphragm in the assembled state of the endoscope apparatus are not necessarily the inspection results. It is not reflected, and there is a possibility that defects such as a defective shape of the opening and misalignment may be overlooked.

  The present invention has been made in view of the above-described circumstances, and an object of the present invention is to provide a diaphragm inspection method capable of easily and reliably inspecting the shape of the diaphragm opening in a state where the diaphragm is assembled, and An endoscope apparatus is provided.

In order to solve the above problems, the present invention proposes the following means.
An endoscope apparatus according to this embodiment is an endoscope apparatus for observing the inside of a subject, and includes an insertion portion that is inserted into the subject, and the insertion portion is inserted into the subject. An image acquisition unit that is disposed at the distal end in the insertion direction and includes a lens barrel that stores an imaging optical system for acquiring an image inside the subject, and an aperture for adjusting the amount of incident light. The image acquisition unit is formed through the outer wall of the lens barrel in order to insert an inspection light source for irradiating inspection light from the image plane side of the imaging optical system toward the diaphragm. The inspection hole is provided.

  It is preferable that the image acquisition unit further includes an image sensor that acquires the image, and the inspection hole is formed so that the inspection light source can be inserted between the diaphragm and the image sensor.

  The central axis of the inspection hole is preferably inclined with respect to the direction from the inspection hole toward the central axis of the lens barrel.

The center axis of the inspection hole preferably extends in a direction intersecting the optical axis of the imaging optical system.
The central axis of the inspection hole preferably extends in a direction perpendicular to the optical axis of the imaging optical system.

  According to the diaphragm inspection method of the present invention, in the irradiation process, the inspection light is irradiated from the image surface side of the optical system to the range covering the aperture of the diaphragm, so that the diaphragm is assembled easily and reliably. The shape of the aperture of the diaphragm can be inspected.

  Further, according to the endoscope apparatus of the present invention, since the inspection hole formed through the lens barrel is provided, the inspection light source can be guided to the inside of the lens barrel through the inspection hole, and the diaphragm is assembled. The shape of the aperture of the diaphragm can be inspected easily and reliably in the found state.

It is a perspective view which shows the endoscope apparatus of one Embodiment of this invention. (A) And (B) is a perspective view which shows the structure of a part of the endoscope apparatus. It is a figure which shows the internal structure of the endoscope apparatus, (A) is a disassembled perspective view, (B) is sectional drawing. It is sectional drawing of the same endoscope apparatus in the AA line of FIG. 3 (B). (A) And (B) is a front view which shows the structure of a part of the endoscope apparatus. It is a flowchart which shows the inspection method of the aperture_diaphragm | restriction of this invention. (A) And (B) is process explanatory drawing for demonstrating the process of the inspection method. (A) is a front view showing the normal shape of the diaphragm, and (B) is a schematic diagram showing an image of the aperture of the diaphragm shown in (A) detected in the inspection method. (A) is a front view showing a state in which there is a defect in the shape of the aperture of the diaphragm, and (B) is a schematic diagram showing an image of the aperture of the diaphragm shown in (A) detected in the inspection method.

Hereinafter, an endoscope apparatus 1 according to an embodiment of the present invention and a diaphragm inspection method according to an embodiment of the present invention will be described.
First, the configuration of the endoscope apparatus 1 of the present embodiment will be described with reference to FIGS. 1 to 5. FIG. 1 is a perspective view showing an endoscope apparatus 1. 2A and 2B are perspective views showing a partial configuration of the endoscope apparatus 1. FIG. 3A and 3B are diagrams showing the internal structure of the endoscope apparatus 1, wherein FIG. 3A is an exploded perspective view and FIG. 3B is a cross-sectional view. FIG. 4 is a cross-sectional view of the endoscope apparatus 1 taken along line AA in FIG. FIGS. 5A and 5B are front views showing a partial configuration of the endoscope apparatus 1.

  As shown in FIG. 1, an endoscope apparatus 1 includes a sheath (insertion unit) 2 extending from a proximal end toward a distal end, and an image acquisition unit that is arranged at the distal end of the sheath 2 and images a target object. 3, a bending drive unit 2 a that is disposed on the proximal end side of the image acquisition unit 3 in the sheath 2 and performs the bending operation of the sheath 2, and a bending drive unit 2 a that is disposed on the proximal end of the sheath 2 and performs the bending operation of the bending drive unit 2 a. The operation section 4 and a main body 5 extending from the operation section 4 to the proximal end side and connected thereto are provided.

  Although not shown in detail, the sheath 2 is formed in a flexible cylindrical shape, and a wiring path extending from the operation unit 4 and the main body 5 to the image acquisition unit 3 and the bending drive unit 2a is inserted therein.

  The image acquisition unit 3 includes an optical adapter 31 fixed to the distal end of the sheath 2, and can capture an image of the inside of the subject through the optical adapter 31.

  The operation unit 4 is provided with a joystick 4a for a user to input a bending direction in order to bend the bending driving unit 2a. In the endoscope apparatus 1 of the present embodiment, the joystick 4a is tilted with respect to the neutral position, and the direction for bending the bending drive unit 2a is input.

  The main body 5 includes a display 5a for displaying an image acquired by the image acquisition unit 3, and a control unit 50 for controlling operations of the image acquisition unit 3 and the bending drive unit 2a.

Next, the internal structure of the image acquisition unit 3 of the endoscope apparatus 1 will be described.
As shown in FIG. 2A, inside the optical adapter 31, a first imaging optical system 31A for condensing light from the subject, and an illumination light source for irradiating the subject with illumination light L and connectors 61A and 62A connected to a signal line for transmitting an illumination signal to the illumination light source L.

As shown in FIG. 2B, the image acquisition unit 3 includes a lens barrel body 37 serving as a lens barrel of the optical system of the image acquisition unit 3 and a substantially cylindrical mirror fixed to the lens barrel body 37. A tube cover 32 is provided.
The lens barrel main body 37 has, for example, an O-ring 37 </ b> A so that liquid and foreign matter do not enter the image acquisition unit 3 when the optical adapter 31 is attached.

As shown in FIGS. 2B and 3A, the lens barrel cover 32 includes a cover opening 33 and a cover opening 34 formed through the lens barrel cover 32 in the axial direction of the lens barrel cover 32. The inspection hole 35 (see FIG. 2 (B)) opened in the outer peripheral surface of the lens barrel cover 32 and the outer peripheral surface of the lens barrel cover 32 to screw the lens barrel cover 32 to the lens barrel body 37. The screw hole 36 formed in this way is formed.
The cover opening 33 is an opening through which light that has passed through the first imaging optical system 31A provided in the optical adapter 31 enters.
Inserted into the cover opening 34 are terminals 61 and 62 which are electrically connected to connectors 61A and 62A provided in the optical adapter 31.

  The inspection hole 35 is formed so as to penetrate the outer wall of the lens barrel cover 32 in the thickness direction, and the inspection hole 35 further penetrates a lens barrel body 37 to be described later and opens on the inner peripheral surface of the lens barrel body 37. doing.

  As shown in FIG. 3A, the screw hole 36 has a tapered inner wall surface formed so that the screw 39 is brought into close contact with each other, and the screw 39 is inserted into the screw hole 36 on the inner wall surface. The lens barrel cover 32 is pressed against the proximal end side of the lens barrel main body 37 when tightened.

  Inside the lens barrel cover 32, a diaphragm 7 for adjusting the amount of incident light incident through the cover opening 33 is attached to the support 6. Further, an imaging optical system 8 that forms an image by refracting incident light that has passed through the diaphragm 7 is provided on the proximal end side of the diaphragm 7.

  The imaging optical system 8 includes a zoom lens unit 81 that adjusts the focus and an imaging optical unit 84 that forms an image of incident light that has passed through the zoom lens unit 81, and the zoom lens unit 81 is connected via a connecting member 82. They are connected by frictional engagement, and are driven to advance and retract along the optical axis direction by an advancing / retreating drive unit 83 described later.

  On the proximal end side from the imaging optical system 84, an imaging device 85 in which an image plane for capturing an image emitted from the imaging optical system 84 is disposed, and an imaging device 85 attached to the imaging device 85 from the imaging device 85. A control board 86 for amplifying the signal is provided.

3A is formed in a rod shape that vibrates in the axial direction by a piezoelectric actuator (not shown), and the advance / retreat drive unit 83 is vibrated by the vibration of the piezoelectric actuator to couple the connecting member 82 and the connecting member 82. The zoom lens unit 81 attached to the lens is advanced and retracted by a Smooth Impact Drive Mechanism (SIDM) (registered trademark).
Although not shown in detail, in this embodiment, the diaphragm 7 is also driven by SIDM, and the size of the aperture of the diaphragm can be changed by an advance / retreat driving unit 79 (see FIG. 3B) having a piezoelectric actuator. It has become.

As shown in FIG. 4, the lens barrel main body 37 is formed through the lens barrel main body 37 so as to be coaxial when the lens barrel main body 37 and the lens barrel cover 32 are assembled. An inspection hole 38 is provided. The inspection hole 35 and the inspection hole 38 constitute an inspection hole that penetrates through the lens barrel cover 32 and the lens barrel main body 37 and opens inside the lens barrel main body. In the present embodiment, the inspection hole 35 and the inspection hole 38 are formed to be inclined with respect to the thickness direction of the outer wall of the cylindrical lens barrel cover 32, and the inspection hole formed by the inspection hole 35 and the inspection hole 38. The central axis O1 is inclined with respect to the direction from the inspection hole 35 and the inspection hole 38 toward the central axis O of the barrel main body 37.
Further, in the present embodiment, the central axis O1 of the inspection hole 35 and the inspection hole 38 extends toward the optical axis L1 so as to intersect the optical axis L1 of the imaging optical system 84, and in this embodiment, the central axis O1. And the optical axis L1 are orthogonal to each other.

  As shown in FIG. 5 (A), the diaphragm 7 has eight wing members having the same shape and size (the wing member 73a, the wing member 73b, the wing member 73c, the wing member 73d, the wing member 73e, and the wing member 73f. , A wing member 73g, a wing member 73h, hereinafter abbreviated as “wing members 73a to 73h”) are connected to the annular connecting portion 71 and the connecting portion 72, respectively.

  The connecting portion 71 is fixed to the support 6 shown in FIG. 3A, and has eight protrusions (protrusion 71a, protrusion 71b, protrusion 71c, protrusion 71d, protrusion 71e, protrusion) inserted into the wing members 73a to 73h. 71f, protrusion 71g, protrusion 71h (hereinafter, abbreviated as "protrusions 71a to 71h") are formed at positions equidistant from the optical axis L1.

  The connecting portion 72 includes eight protrusions (protrusions 72a, 72b, 72c, 72d, 72d, 72e, 72f, 72g, 72h, hereinafter referred to as “protrusions 72a to 72h” inserted through the wing members 73a to 73h. Are formed at equidistant positions from the optical axis L1. Further, the protrusions 72a to 72h are located on the radially outer side than the protrusions 71a to 71h. Although not shown in detail, the connecting portion 72 is formed with a connecting member 75 connected to the advancing / retreating drive portion 79 via a pin 76.

  When the connecting portion 72 is rotated relative to the connecting portion 71 around the optical axis L1, the wing members 73a to 73h are moved closer to the optical axis L1 or from the optical axis L1. It turns so that it may be spaced apart. The shape of the aperture of the diaphragm 7 formed by the wing members 73a to 73h is substantially circular with the optical axis L11 as the center, and the aperture diameter of the diaphragm 7 is set to the maximum aperture d1 and the minimum aperture by the advance / retreat drive unit 79. It can be changed continuously with d2.

  In the following, the diaphragm inspection method of the present embodiment will be described with reference to FIGS. 6 to 9 using an example of inspecting the diaphragm 7 of the endoscope apparatus 1 described above. FIG. 6 is a flowchart showing the diaphragm inspection method of the present invention. FIGS. 7A and 7B are process explanatory diagrams for explaining the irradiation process and the inspection process in the diaphragm inspection method. 8A is a front view showing the normal shape of the stop, and FIG. 8B is a schematic view showing an image of the aperture of the stop shown in FIG. 8A detected in the stop inspection method. is there. 9A is a front view showing a state in which the shape of the aperture of the aperture is defective, and FIG. 9B is an image of the aperture of the aperture shown in FIG. 9A detected in the aperture inspection method. It is a schematic diagram shown.

  In the present embodiment, in order to inspect the opening of the diaphragm 7, for example, as shown in FIGS. 7A and 7B, the inside of the barrel main body 37 is externally connected to the inside of the lens barrel body 37 by an optical fiber 92. An inspection light source 91 that introduces inspection light into the imaging device, an imaging unit 93 that receives the inspection light from the inspection light source 91 outside the endoscope apparatus 1 and captures an image of the aperture of the diaphragm 7, and the imaging unit 93 An inspection machine including a computer 94 that inspects the shape of the aperture of the aperture 7 based on the image of the aperture of the aperture 7 is used.

The optical fiber 92 has a distal end surface 92A formed to be inclined at an angle of about 45 degrees with respect to its central axis, and irradiates inspection light from the distal end surface 92A.
The imaging unit 93 is an imaging optical unit 93A that refracts inspection light emitted from the inspection light source 92, and imaging in which the light refracted by the imaging optical unit 93A is imaged and an image of the aperture of the diaphragm 7 is captured. Element 93B.

  As shown in FIG. 6, in order to inspect the diaphragm 7, first, an detaching step S <b> 1 is performed in which the optical adapter 31 (see FIG. 2A) of the endoscope apparatus 1 is removed from the image acquisition unit 3. Done. When the optical adapter 31 is removed from the image acquisition unit 3, the lens barrel cover 32 provided inside the image acquisition unit 3 is exposed to the outside as shown in FIG. When the lens barrel cover 32 is exposed to the outside, the removal step S1 ends and the process proceeds to the irradiation step S2.

  In the irradiation step S2, the endoscope apparatus 1 is set on an inspection machine for inspecting the diaphragm 7 of the endoscope apparatus 1, and an inspection light source for irradiating inspection light for inspecting the opening of the diaphragm 7 is used for the endoscope apparatus 1. This is a step of irradiating the aperture 7 with inspection light after being inserted through the inspection hole 35.

  In the irradiation step S <b> 2, the optical fiber 92 is inserted from the distal end surface 92 </ b> A side through the inspection hole 35 formed in the lens barrel cover 32 and the lens barrel body 37 while the lens barrel cover 32 is fixed to the lens barrel body 37. insert. At this time, the distal end surface 92A is directed to the diaphragm 7 side as shown in FIG.

  In the irradiation step S <b> 2, the optical fiber 92 of the inspection light source 91 is inserted between the imaging optical unit 84 and the zoom lens 81 from a direction intersecting the optical axis L <b> 1 of the imaging optical unit 84 and the zoom lens 81. That is, the inspection light source 91 is disposed closer to the image sensor 85 (image surface side) than the diaphragm 7.

  In the irradiation step S2, in order to suppress the bending stress from being applied to the optical fiber 92, the tip 92A of the optical fiber 92 is moved using a manipulator that holds the inspection light source 91 and moves it relative to the endoscope apparatus 1. May be inserted into the inspection hole 35.

When the optical fiber 91 of the inspection light source 91 is inserted between the imaging optical unit 84 and the zoom lens 81, the inspection light is transmitted from the inspection light source 91 to the optical fiber 92, and this inspection light is transmitted from the tip surface of the optical fiber 92. The light is emitted from 92 </ b> A and irradiated to a range covering the opening of the diaphragm 7 inside the barrel main body 37.
This completes the irradiation step S2 and proceeds to the imaging step S3.

The imaging step S3 is a step in which the inspection light that has passed through the diaphragm 7 is acquired by the imaging unit 93 and an image of the diaphragm is captured.
In the above-described irradiation step S2, the inspection light passes through the zoom lens 81 and is applied to the wing members 73a to 73h (see FIG. 5) of the diaphragm 7 from the distal end surface 92A of the optical fiber 92. At this time, in the diaphragm 7, part of the inspection light is blocked by the wing members 73 a to 73 h, and the inspection light that passes through the opening of the diaphragm 7 enters the imaging unit 93.

  In the imaging step S <b> 3, in the imaging unit 93, the imaging element 93 </ b> B receives the inspection light that has passed through the aperture of the diaphragm 7, converts it into image data, and transmits the image data of the aperture of the diaphragm 7 to the computer 94.

In the imaging step S3, the advancing / retreating drive unit 79 is operated to rotate the wing members 73a to 73h, and the aperture diameter is changed to a plurality of sizes between the maximum aperture d1 and the minimum aperture d2, and the aperture 7 The image data of the aperture is imaged by the image sensor 93B and transmitted to the computer 94.
When the image data of the aperture of the diaphragm 7 is transmitted to the computer 94, the imaging process S3 ends and the process proceeds to the image processing process S4.

The image processing step S4 is a step of processing the image data captured by the imaging unit 93 by the computer 94.
In the image processing step S4, the image data of the aperture of the diaphragm 7 transmitted to the computer 94 is converted into binary image data. Thereby, the image of the aperture of the aperture 7 is binarized so that the portion blocked by the wing members 73a to 73h is a dark portion, and the portion passing through the aperture 7 without being blocked by the wing members 73a to 73h is a bright portion. The For example, as shown in FIGS. 8A and 8B, the boundary Q1 between the dark part and the bright part obtained in the image processing step S4 reflects the shape of the aperture of the diaphragm 7.
This completes the image processing step S4 and proceeds to the inspection step S5.

  The inspection step S5 is a step of detecting a shape defect of the diaphragm 7 in comparison with a reference circle stored in advance in the computer 94 based on the image data of the aperture of the diaphragm 7 converted into binary values of a dark part and a bright part. It is.

  In the inspection step S5, the true circular reference circles C1 and D1 set based on the design size of the aperture diameter are superimposed on the image data of the aperture of the aperture 7 as shown in FIG. 8B. Here, the size of the diameter of the reference circle C1 is the upper limit of the allowable error of the control target value when the advance / retreat drive unit 79 is driven so that the diameter of the aperture of the aperture 7 becomes the diameter d. The size of the diameter of the circle D1 is the lower limit of the allowable error at this time.

  In the inspection step S5, the area surrounded by the boundary Q1 is compared with the reference circle C1 and the reference circle D1, and if the area surrounded by the boundary Q1 deviates from the reference circles C1 and D1 by an allowable error or more, the center of the diaphragm 7 is misaligned. It is determined that (defect) has occurred. When the area surrounded by the boundary Q1 is larger than the reference circle C1 or smaller than the reference circle D1, the drive amount of the wing members 73a to 73h is deviated from the control target value in the advance / retreat drive unit 79 (defective). ).

  FIG. 9A shows an example in which a defective shape of the aperture of the diaphragm 7 has occurred. FIG. 9A shows an example in which the protrusion 71c and the protrusion 72h are worn and deformed. As shown in FIG. 9A, when the projections 71a to 71h or the projections 72a to 72h that support the wing members 73a to 73h are deformed, a deviation occurs in each combination of the wing members 73a to 73h. 7 may have gaps X1, X2, etc., and the opening may not be substantially circular. In such a case, in the inspection step S5, as shown in FIG. 9B, the boundary Q2 indicating the shape of the opening of the diaphragm 7 is positioned outside the reference circle C1 along the shapes of the gaps X1 and X2. Data is obtained. Thereby, it is determined in the inspection step S5 that the shape of the aperture of the diaphragm 7 is defective.

  As described above, in the inspection step S5, the size of the aperture of the aperture 7 and the shape of the aperture of the aperture 7 are inspected, and when the above-described defects occur in the aperture and shape, the aperture is opened. The positional deviation from the reference, the type of defect, and the defect location are displayed on a monitor of the computer 94, for example.

This completes the inspection process S5. After completion of the inspection step S5, the inspection light source 91 is removed from the inspection hole 35, and the inspection hole 35 is sealed with an adhesive or the like. This adhesive is for preventing liquid such as water from entering through the inspection hole 35 and preventing external light from entering the inside of the barrel main body 37 through the inspection hole 35.
The inspection of the diaphragm 7 of the endoscope apparatus 1 is thus completed.

  As described above, according to the endoscope apparatus 1 of the present embodiment, the inspection hole 35 for guiding the optical fiber 92 of the inspection light source 91 to the inside of the barrel main body 37 is provided. The inspection light is irradiated from between the zoom lens 81 toward the wing members 73 a to 73 h of the diaphragm 7, and the inspection light that has passed through the diaphragm 7 without being blocked by the wing members 73 a to 73 h can be imaged by the imaging unit 93. For this reason, the shape of the opening of the diaphragm 7 can be inspected easily and reliably in a state where the diaphragm 7 is assembled to the endoscope apparatus 1.

  Further, since the central axis O1 of the inspection hole 35 is inclined with respect to the direction from the inspection hole 35 toward the optical axis L1 in the lens barrel body 32, the distal end surface 92A of the optical fiber 92 is light-transmitted by the inner wall surface of the inspection hole 35. Guided on axis L1. For this reason, the inspection light transmitted through the optical fiber 92 can be efficiently irradiated toward the diaphragm 7.

  Further, according to the diaphragm inspection method of the present embodiment, in the irradiation step S <b> 2, the inspection light is irradiated from the optical fiber 92 inserted between the imaging element 85 and the zoom lens 81 to the range covering the opening of the diaphragm 7. Therefore, the shape of the aperture of the diaphragm 7 can be inspected easily and accurately with the diaphragm 7 assembled to the endoscope apparatus 1.

  In the irradiation step S2, since the inspection light source 91 is inserted from the outside of the endoscope apparatus 1 into the barrel main body 37 from the side of the optical axis L1, the optical fiber 92 of the inspection light source 91 is bent. The optical fiber 92 can be easily inserted into the barrel main body 37.

  In the inspection step S5, since the opening of the diaphragm 7 is inspected with the optical adapter 31 removed in the removal step S1, the lens such as the first imaging optical system 31A of the optical adapter 31 is transmitted. Without this, the inspection light emitted from the diaphragm 7 can be incident on the imaging unit 93. As a result, it is possible to directly detect the aperture shape and to take measures against the cause of the defect, so that the inspection can be performed with high accuracy.

As mentioned above, although embodiment of this invention was explained in full detail with reference to drawings, the concrete structure is not restricted to this embodiment, The design change etc. of the range which does not deviate from the summary of this invention are included.
For example, in the above-described embodiment, the example in which the inspection hole 35 is formed such that the central axis O1 extends toward the optical axis L1 in the barrel main body 35 is shown, but the shape of the inspection hole is limited to this. is not. For example, the central axis of the inspection hole may extend in any direction that intersects the optical axis L1. In this case, it is possible to reduce the unevenness of the light passing through the aperture of the diaphragm by optimizing the position at which the inspection light is emitted inside the lens barrel body, so that an image of the aperture of the aperture can be taken clearly.

  In the above-described embodiment, an example in which the distal end surface 92A of the optical fiber 92 is positioned on the optical axis L1 is shown. As long as the position is irradiated to 73h, the inspection hole 35 may guide the tip surface 92A of the optical fiber 92 to a position other than on the optical axis L1.

  Further, the example in which the inspection light source 91 introduces the inspection light into the barrel main body 32 by the optical fiber 92 has been shown. However, the present invention is not limited thereto, and a light emitting member that emits inspection light is directly introduced into the barrel main body 32. May be.

  In the present embodiment, the example in which the optical adapter 31 is detached from the endoscope apparatus 1 and the diaphragm 7 is inspected is shown. However, the endoscope immediately before the optical adapter 31 is attached in the manufacturing process of the endoscope apparatus 1 is shown. When inspecting the diaphragm 7 of the mirror device 1, the process may proceed to the irradiation step S2 without performing the removal step S1.

  In addition, binary image data may be transmitted to the computer 94 in the imaging unit 93, and in this case, the image processing step S4 may be omitted.

  In the above-described embodiment, an example in which the diaphragm 7 of the endoscope apparatus 1 is inspected has been described. However, the present invention is not limited to this, and an optical system for acquiring an image of a subject by the diaphragm inspection method of the present invention. It is possible to inspect various diaphragms assembled in an optical apparatus having

DESCRIPTION OF SYMBOLS 1 Endoscope apparatus 2 Insertion part 3 Image acquisition part 7 Aperture 32 Lens barrel cover 37 Lens barrel main body 35 Inspection hole 91 Inspection light source L1 Optical axis S1 Removal process S2 Irradiation process S4 Imaging process S5 Inspection process

Claims (5)

An endoscope apparatus for observing the inside of a subject,
An insertion portion to be inserted into the subject;
A lens barrel in which an imaging optical system for acquiring an image inside the subject is disposed, and a diaphragm for adjusting the amount of incident light, are arranged at a distal end in the insertion direction in which the insertion portion is inserted into the subject. An image acquisition unit having
With
The image acquisition unit
In order to insert an inspection light source for irradiating inspection light from the image plane side of the imaging optical system toward the diaphragm, an inspection hole formed through the outer wall of the lens barrel is provided. An endoscope apparatus characterized by that.
The image acquisition unit
An image pickup device for acquiring the image;
The inspection hole is
The endoscope apparatus according to claim 1, characterized in that the test light source is insertable formed between the diaphragm and the imaging device.
The central axis of the inspection hole is
The endoscope apparatus according to claim 1 , wherein the endoscope apparatus is inclined with respect to a direction from the inspection hole toward a central axis of the barrel.
The central axis of the inspection hole is
The endoscope apparatus according to claim 1 , wherein the endoscope apparatus extends in a direction crossing an optical axis of the imaging optical system.
The central axis of the inspection hole is
The endoscope apparatus according to claim 1 , wherein the endoscope apparatus extends in a direction orthogonal to the optical axis of the imaging optical system.

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