Endoscope imaging device and endoscope

Abstract

To provide an endoscope imaging device and an endoscope capable of adjusting a position of a fixed lens along an optical axis.SOLUTION: An endoscope imaging device includes at least one moving group having a movable lens capable of moving along an optical axis and a fixed lens whose position is fixed with respect to the optical axis, a plurality of fixed groups, at least one of which is an adjustment group, a sensor for imaging an observation object, and a lens driving part for moving the moving group to the optical axis. The adjustment group includes a cylindrical holding part, and the holding part includes a gripping part at one end part of the holding part, and an end surface at the other end part opposite to the one end part in an optical axis direction. The gripping part includes a convex part or a concave part whose diameter changes in a radial direction of the holding part. In the adjustment group, the end surface of the other end part of the holding part is disposed at a position away from a lens barrel body in which the moving group, the fixed group, and the lens driving part are provided, or the fixed group in an optical axis direction. The gripping part is disposed at a position away from the lens barrel body or the fixed group in the optical axis direction, and protrudes from the lens barrel body or the fixed group. A side surface of the holding part is fixed to the lens barrel body or the fixed group.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to an endoscopic imaging device and an endoscope that acquire images of an object to be observed, and in particular to an endoscopic imaging device and an endoscope that have a movable lens that can move along an optical axis and a fixed lens whose position is fixed relative to the optical axis. [Background technology]

[0002] 2. Description of the Related Art Diagnosis and the like using an endoscope system including an endoscopic light source device, an endoscope (endoscopic scope), and a processor device is widely performed. The endoscope has an insertion section that is inserted into the body of a subject, and illumination light from an endoscopic light source device is irradiated onto an object to be observed through the insertion section. The endoscope uses an imaging element to capture an image of the object to be observed illuminated with the illumination light and generate an image signal. The processor device processes the image signal generated by the endoscope to generate an observation image to be displayed on a monitor. The imaging element is electrically connected to a signal cable via a circuit board formed of a flexible wiring board or the like, and the signal cable is electrically connected to the processor device. In recent years, endoscopes equipped with optical magnification or focusing functions have been proposed.

[0003] For example, Patent Document 1 describes an endoscope having an imaging unit inserted into a distal end portion and fixed within the distal end portion by a fixing member, a non-movable lens frame provided in the imaging unit and against which the fixing member abuts, and a movable lens frame provided within the non-movable lens frame and slidable along the inner surface of the non-movable lens frame, wherein a notch is provided in at least one of the portions where the distal end portion and the non-movable lens frame or the non-movable lens frame and the movable lens frame abut, at a position symmetrical with respect to the fixed position by the fixing member and through which the photographing optical axis of the imaging unit passes. A movable unit that performs a magnification change function or a focusing function is connected to the movable lens frame. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2008-110061 Summary of the Invention [Problem to be solved by the invention]

[0005] In the above-mentioned Patent Document 1, the movable lens frame is equipped with a movable lens, and a moving unit is connected to the movable lens frame. The movable lens frame is movable forward and backward in the photographic optical axis direction within the rear lens group frame, which is a non-movable lens frame. The movable lens frame is provided between the front lens group and the rear lens group, and the rear lens group is held by the rear lens group frame. Currently, the optical performance required of endoscopes is becoming higher. Optical performance is affected by factors such as lens precision and assembly precision. However, Patent Document 1 does not take into consideration adjusting the positions of the front and rear lens groups, and does not provide a way to adjust the positions of the front and rear lens groups when the required optical performance cannot be obtained. For this reason, Patent Document 1 has difficulty dealing with cases where the required optical performance cannot be obtained. An object of the present invention is to provide an endoscopic imaging device and an endoscope in which the position of a fixed lens can be adjusted along the optical axis. [Means for solving the problem]

[0006] In order to achieve the above-mentioned object, the invention [1] is an endoscopic imaging device for acquiring an image of an observation object, the device comprising: at least one moving group having a movable lens that can move along an optical axis; a plurality of fixed groups having fixed lenses whose positions are fixed relative to the optical axis; a sensor that receives light that has passed through the movable lenses of the moving group and the fixed lenses of the fixed group, and captures an image of the observation object; a lens drive unit that moves the moving group along the optical axis; and a lens barrel body in which the moving group, the fixed group, and the lens drive unit are provided, and at least one of the plurality of fixed groups is an adjustment group, and the adjustment group has a fixed lens therein. an endoscope imaging device comprising: a cylindrical holding portion on which an adjustment group is provided; the holding portion has a gripping portion provided at one end of the holding portion and an end face provided at the other end opposite the one end in the optical axis direction; the gripping portion has a convex portion or a concave portion whose diameter varies in the radial direction of the holding portion; the end face provided at the other end of the holding portion is positioned at a position separated from the barrel main body or the fixed group in the optical axis direction; and the gripping portion is positioned at a position separated from the barrel main body or the fixed group in the optical axis direction and protrudes from the barrel main body or the fixed group; and the side of the holding portion is fixed to the barrel main body or the fixed group.

[0007] Invention [2] is the endoscopic imaging device according to invention [1], in which the adjustment group is provided at the end of the barrel body on the observation object side or at the end of the barrel body on the sensor side. Invention [3] is an endoscopic imaging device according to invention [1] or [2], in which the gripping portion has at least one convex portion, concave portion, or hole in the circumferential direction of the holding portion, the diameter of which varies in the radial direction of the holding portion. Invention [4] is an endoscopic imaging device according to any one of inventions [1] to [3], in which, of the multiple fixed groups, the fixed groups other than the adjustment group are mechanically positioned in the optical axis direction. Invention [5] is an endoscopic imaging device according to any one of inventions [1] to [4], in which a fixed group is provided at the end of the barrel body on the observation object side, and an adjustment group is provided at the end of the barrel body on the sensor side. The invention [6] is an endoscope having the endoscopic imaging device according to any one of the inventions [1] to [5]. [Effects of the Invention]

[0008] According to the present invention, it is possible to provide an endoscopic imaging device and an endoscope that are capable of adjusting the position of a fixed lens along the optical axis, which allows the position of the fixed lens to be adjusted along the optical axis when, for example, required optical performance cannot be obtained. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a schematic diagram illustrating an example of an endoscope system according to an embodiment of the present invention. [Figure 2] 1 is a schematic cross-sectional side view showing a first example of an endoscopic imaging device according to an embodiment of the present invention. [Figure 3] 1 is a schematic side cross-sectional view showing a first example of an adjustment group of an endoscopic imaging device according to an embodiment of the present invention. [Figure 4] 1 is a schematic plan view showing a first example of an adjustment group of an endoscopic imaging device according to an embodiment of the present invention. FIG. [Figure 5] FIG. 2 is a schematic cross-sectional side view showing a second example of an endoscopic imaging device according to an embodiment of the present invention. [Figure 6] FIG. 2 is a schematic enlarged cross-sectional side view of a first fixed group and an adjustment group of a second example of an endoscopic imaging device according to an embodiment of the present invention. [Figure 7] 10 is a schematic partial side cross-sectional view showing a second example of a gripping portion of an adjustment group of an endoscopic imaging device according to an embodiment of the present invention. FIG. [Figure 8] 10 is a schematic partial side cross-sectional view showing a third example of a gripping portion of an adjustment group of an endoscopic imaging device according to an embodiment of the present invention. FIG. [Figure 9] FIG. 10 is a schematic plan view showing a third example of a gripping portion of an adjustment group of an endoscopic imaging device according to an embodiment of the present invention. [Figure 10] FIG. 10 is a schematic partial side cross-sectional view showing a fourth example of a gripping portion of an adjustment group of an endoscopic imaging device according to an embodiment of the present invention. [Figure 11] FIG. 10 is a schematic partial side cross-sectional view showing a fifth example of a gripping portion of an adjustment group of an endoscopic imaging device according to an embodiment of the present invention. [Figure 12] FIG. 10 is a schematic plan view showing a fifth example of a gripping portion of an adjustment group of an endoscopic imaging device according to an embodiment of the present invention. [Figure 13] FIG. 10 is a schematic plan view showing a sixth example of a gripping portion of an adjustment group of an endoscopic imaging device according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0010] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The endoscopic imaging device and endoscope of the present invention will be described in detail below based on preferred embodiments shown in the accompanying drawings. It should be noted that the drawings described below are illustrative for explaining the present invention, and the present invention is not limited to the drawings shown below. In the following description, terms such as "specific angle," "parallel," "perpendicular," and "orthogonal" include a generally acceptable error range in the relevant technical field.

[0011] [Endoscope system] The endoscopic system irradiates an observation area, such as the inside of a subject, with illumination light (not shown), captures an image of the observation area, generates a display image of the observation area based on the image signal obtained by capturing the image, and displays the display image. FIG. 1 is a schematic diagram showing an example of an endoscope system according to an embodiment of the present invention. The endoscope system 10 includes an endoscope 12, a light source device 14, and a processor device 16. The endoscope system 10 has the same configuration as a general endoscope, except for an endoscopic imaging device 20 (see FIG. 2) of the endoscope 12, which will be described later. The endoscope system 10 may further include a water tank for storing cleaning water, a suction pump for sucking the aspirated material from the body cavity (including the supplied cleaning water, etc.), etc. Furthermore, the endoscope system 10 may further include a supply pump for supplying cleaning water from the water tank or a gas such as external air to a conduit (not shown) in the endoscope.

[0012] Although not shown in detail, the endoscope 12 has an insertion section that is inserted into the subject, an operation section that is connected to the insertion section, and a universal cord that extends from the operation section, and the insertion section is composed of a tip section, a bending section that is connected to the tip section, and a flexible section that connects the bending section and the operation section.

[0013] The distal end 12a of the endoscope 12 is provided with an illumination optical system that emits illumination light to illuminate the observation site, or a sensor and imaging optical system that capture an image of the object at the observation site. The bending section is configured to be bendable in a direction perpendicular to the longitudinal axis of the insertion section, and the bending operation of the bending section is controlled by an operating section. The flexible section is configured to be relatively flexible enough to be deformable to follow the shape of the insertion path of the insertion section.

[0014] The operation section is provided with buttons for operating the imaging operation of the endoscopic imaging device 20 (see FIG. 2) at the tip section 12a, knobs for operating the bending operation of the bending section, etc. The operation section is also provided with an introduction port through which a treatment tool such as an electric scalpel is introduced, and a treatment tool channel is provided inside the insertion section that extends from the introduction port to the tip section and through which a treatment tool such as forceps is inserted.

[0015] A connector is provided at the end of the universal cord, and the endoscope 12 is connected via the connector to a light source device 14 that generates illumination light emitted from an illumination optical system at the tip, and a processor device 16 that processes video signals acquired by an endoscopic image pickup device 20 (see FIG. 2) at the tip 12a. At least one of signals and power is transmitted between the endoscopic image pickup device 20 (see FIG. 2) and the processor device 16 via a group of electric wires.

[0016] The processor unit 16 processes the input video signal to generate video data of the observed region, and displays the generated video data on a monitor (not shown) or records it on a storage medium such as a hard disk. The processor unit 16 may be configured by a processor such as a personal computer.

[0017] The light source device 14 generates illumination light such as white light or light of a specific wavelength composed of three primary colors of light, such as red light (R), green light (G), and blue light (B), and supplies it to the endoscope 12, where it propagates through a light guide or the like within the endoscope 12 and is emitted from an illumination optical system at the tip of the insertion section of the endoscope 12 to illuminate the area to be observed within the body cavity, in order to capture an image of the area to be observed within the body cavity using the endoscopic imaging device 20 (see Figure 2) of the endoscope 12 and obtain an image signal of the area to be observed.

[0018] A light guide or a group of electric wires (signal cables) is housed inside the insertion section, the operation section, and the universal cord. Illumination light generated by the light source device 14 is guided to the illumination optical system at the tip via a light guide (not shown), and the light is emitted from the tip surface 18a (see FIG. 2) of the endoscopic imaging device 20 (see FIG. 2). For example, a forceps port (not shown), an observation window 18c (see FIG. 2), and a light guide (not shown) are provided on the distal end surface 18a of the endoscopic imaging device 20. In addition to these, an air / liquid supply nozzle (not shown) may also be provided on the distal end surface 18a. A forceps pipe (not shown) is connected to the forceps opening either integrally or separately. A forceps treatment tool or an injection needle is stored in the forceps pipe. The forceps treatment tool or the injection needle protrudes from the forceps opening. The light guide is optically connected to the light source device 14 (see FIG. 1), guides the illumination light emitted by the light source device 14, and emits the illumination light toward the observation object.

[0019] [First Example of Endoscopic Imaging Device] FIG. 2 is a schematic cross-sectional side view showing a first example of an endoscopic imaging device according to an embodiment of the present invention. The endoscopic imaging device 20 shown in FIG. 2 is for acquiring an image of an observation target, and is provided with an optical zoom function or focusing function. The endoscopic imaging device 20 has at least one moving group having a movable lens that can move along the optical axis C, multiple fixed groups having fixed lenses whose positions are fixed relative to the optical axis C, a sensor 25 that receives light that has passed through the movable lenses of the moving group and the fixed lenses of the fixed group and captures an image of the object to be observed, a lens drive unit that moves the moving group along the optical axis, and a barrel body 30 in which the moving group, the fixed group, and the lens drive unit 45 are provided.

[0020] Specifically, as shown in FIG. 2, the endoscopic imaging device 20 has a first fixed group 21, a first moving group 22, a second moving group 23, and a second fixed group 24, and has a barrel main body 30. The distal end side of the endoscopic imaging device 20 is the distal end body 18 side. The lens barrel body 30 is composed of a lens storage section 31 , a connecting section 33 and a housing 32 . A cylindrical lens storage section 31 is provided in the observation window 18c. When the distal end surface 18a of the distal end body 18 is viewed from the optical axis direction, the cylindrical lens storage section 31 and the cylindrical housing 32 are arranged side by side in the distal end body 18, with the central axis CL of the cylindrical lens storage section 31 and the central axis Ct of the cylindrical housing 32 parallel to each other, for example. The lens storage section 31 and the housing 32 are connected in a communicating state by a connecting section 33 made of two parallel plate members. When the lens storage section 31, the housing 32, and the connecting section 33 are viewed from the distal end surface 18a of the endoscopic imaging device 20, they have a shape in which two circles spaced apart are connected by two parallel sides with their centers located between the two parallel sides, and there are no arcs inside the two sides. In other words, the shape is such that arcs are connected to both sides of the two parallel sides, and the rest of the shape is made up of arcs.

[0021] The end of the barrel body 30 on the tip body 18 side is the end 30a on the observation subject side. A sensor 25 is provided at end 30b of the barrel body 30 opposite end 30a on the observation subject side. In the example shown in FIG. 2, of the multiple fixed groups of the first fixed group 21 and the second fixed group 24, the second fixed group 24 is an adjustment group 24a. The barrel body 30 is provided with a first fixed group 21, a first moving group 22, a second moving group 23, and a second fixed group 24, in this order, along a direction from the end 30a of the barrel body 30 on the subject side toward the end 30b on the sensor 25 side. The first fixed group 21 is provided at an end 30a on the observation object side of the barrel body 30. The second fixed group 24, i.e., the adjustment group 24a, is provided at an end 30b of the barrel body 30 on the sensor 25 side. The first moving group 22 and the second moving group 23 are provided inside the barrel body 30, with the first moving group 22 being disposed on the observation subject side of the barrel body 30.

[0022] The first fixed group 21 has a first fixed lens 34 and a lens holding member 35 that holds the first fixed lens 34. The first fixed lens 34 has, for example, three lenses 34a, 34b, and 34c. The three lenses 34a, 34b, and 34c are aligned with their optical axes C and are held together in one lens holding member 35 with their positions fixed relative to the optical axis C. The lens holding member 35 is fitted into the end surface 30c of the lens housing portion 31 of the lens barrel main body 30 on the subject side. The lens holding member 35 has a cylindrical holding portion 35a, a flange 35b, and a cylindrical storage portion 35c. The flange 35b protrudes further in the radial direction of the first fixed lens 34 than the storage portion 35c. The flange 35b contacts the end face 30c of the lens storage portion 31 of the barrel main body 30, and the lens holding member 35 of the first fixed group 21 is mechanically positioned in the optical axis direction by the barrel main body 30. This ensures that the holding portion 35a of the lens holding member 35 remains outside the barrel main body 30. The storage portion 35c fits into the end face 30c of the lens storage portion 31 on the subject side. The holding portion 35a holds the lens 34a, and the storage portion 35c holds the lenses 34b and 34c. The fixed group being mechanically positioned in the optical axis direction means that the position of the adjustment group is fixed in contact with the barrel body 30 in the optical axis direction.

[0023] An end surface 30c of the lens storage section 31 facing the subject and an end surface 32a of the housing 32 facing the subject are flush with each other, but a lens holding member 35 protrudes from the end surface 30c of the lens storage section 31 facing the subject. Of the first fixed lens 34, lens 34a is disposed outside the lens storage section 31. The lens holding member 35 can rotate about the optical axis C by means of the flange 35b and the cylindrical housing portion 35c. This allows the first fixed lens 34 to be adjusted in the circumferential direction, and the optical performance such as MTF (Modulation Transfer Function) and lens decentering can be adjusted. After adjusting the circumferential position of the first fixed lens 34, the flange 35b and the end face 30c of the lens holding member 35 are fixed together using, for example, an adhesive. Note that the adhesive used to fix the lens barrel main body 30 and the adjustment group 24a (described later) can be used as the adhesive. The MTF and lens decentering can be measured, for example, by photographing an inspection chart, generating image data of the inspection chart using the processor device 16 (see FIG. 1), and displaying the image data of the inspection chart on a monitor (not shown). Adjusting the lens decentering can eliminate so-called one-sided blur.

[0024] The first moving group 22 has a first movable lens 36 and a first movable lens holder 37, and the first movable lens 36 is movable along the optical axis C. The first movable lens 36 is, for example, a single lens. The first movable lens holder 37 has a cylindrical guide portion 37a, a lens frame 37b, and a connecting portion 37c that connects the guide portion 37a and the lens frame 37b, which are integrally formed. More specifically, the first movable lens 36 is held by the lens frame 37b.

[0025] The second moving group 23 has a second movable lens 38 and a second movable lens holder 39, and the second movable lens 38 is movable along the optical axis C. The second movable lens 38 has, for example, two lenses 38a and 38b. The two lenses 38a and 38b of the second movable lens 38 are held by a second movable lens holder 39. The second movable lens holder 39 has a cylindrical guide portion 39a, a lens frame 39b, and a connecting portion 39c that connects the guide portion 39a and the lens frame 39b, and these are integrally formed. More specifically, the two lenses 38a and 38b of the second movable lens 38 are held together by the single lens frame 39b, with their optical axes C aligned.

[0026] The second fixed group 24, that is, the adjustment group 24a, has a second fixed lens 40 and a fixed lens holding member . The second fixed lens 40 has, for example, three lenses 40a, 40b, and 40c. The three lenses 40a, 40b, and 40c are aligned with an optical axis C and are held together by a single fixed lens holding member 42 in a state where their positions are fixed with respect to the optical axis C.

[0027] The optical axes C of the first fixed lens 34, the first movable lens 36, the second movable lens 38, and the second fixed lens 40 are aligned. The first fixed lens 34, the first movable lens 36, the second movable lens 38, and the second fixed lens 40 are arranged in the lens housing section 31 so that their optical axes C coincide with the central axis CL of the lens housing section 31. The first fixed lens 34, the first movable lens 36, the second movable lens 38, and the second fixed lens 40 form an imaging lens 41. The first fixed lens 34, the first movable lens 36, the second movable lens 38, and the second fixed lens 40 are optical elements that form an image of incident light on the light receiving surface 25a of the sensor 25. The first fixed lens 34, the first movable lens 36, the second movable lens 38, and the second fixed lens 40 form an object image on the light receiving surface 25a of the sensor 25. The first fixed lens 34, the first movable lens 36, the second movable lens 38, and the second fixed lens 40 are held so that their optical axes C are perpendicular to the incident surface 27a of the prism 27, which will be described later. The configuration of the imaging lens 41 is not particularly limited to the configuration described above. Furthermore, each lens that makes up the imaging lens 41 may be a convex lens or a concave lens. Here, the direction parallel to the optical axis C of the first fixed lens 34, the first movable lens 36, the second movable lens 38, and the second fixed lens 40 is defined as the X direction. Of the two directions perpendicular to the optical axis C, one is defined as the Y direction and the other as the Z direction. The above-mentioned X direction corresponds to the optical axis direction. Note that an axial direction, such as the optical axis direction, refers to the direction in which an axis extends. The optical axis direction is the direction in which the optical axis C extends.

[0028] The endoscopic imaging device 20 also has a lens drive unit 45 that moves the first moving group 22 and the second moving group 23 along the optical axis C to perform an optical zoom function or a focusing function. Being movable along the optical axis C means being movable in the direction of the optical axis.

[0029] The lens driving unit 45 is housed in the housing 32. The lens driving unit 45 has a camshaft 46. For example, the camshaft 46 is cylindrical, and is disposed so that its rotation axis Cd coincides with the central axis Ct of the housing 32. Therefore, the central axis CL of the lens housing unit 31 and the central axis Ct of the housing 32 are parallel to the optical axis C. A drive member 47 is connected to an end 46c of the camshaft 46 opposite the end face 32a. Rotation of the drive member 47 causes the camshaft 46 to rotate about a rotation axis Cd. The driving member 47 is connected to a driving unit such as a motor. The driving member 47 is rotated by the motor. The driving member 47 is made of a flexible member, for example. More specifically, the driving member 47 is made of a wire.

[0030] A tip support portion 48 is provided on the subject-side end surface 32a of the housing 32. The camshaft 46 is rotatably supported by the tip support portion 48. A flange 46b that protrudes outward along the outer periphery is provided near an end 46c of the camshaft 46. A locking ring 32c is provided on the opposite side of the end face 32a described above inside the housing 32 that houses the lens driving unit 45. The flange 46b of the camshaft 46 is located closer to the end face 32a of the housing 32 than the locking ring 32c and is housed inside the housing 32. Friction between the flange 46b of the camshaft 46 and the locking ring 32c is small, so the rotation of the camshaft 46 is not hindered. In addition, the locking ring 32c prevents the camshaft 46 from coming loose.

[0031] The camshaft 46 is provided with a first movable lens holder 37 and a second movable lens holder 39 between the tip 46a and the flange 46b in the rotation axis direction. The first movable lens holder 37 and the second movable lens holder 39 are arranged across the lens storage section 31, the connecting section 33, and the housing 32. Between the tip 46a and the flange 46b, for example, a first cam groove (not shown) for moving the first movable lens 36 along the optical axis direction and a second cam groove (not shown) for moving the second movable lens 38 along the optical axis direction are provided on the outer circumferential surface of the camshaft 46. The rotation axis direction is parallel to the optical axis direction.

[0032] A camshaft 46 is slidably inserted into the guide portion 37a of the first movable lens holding portion 37. The guide portion 37a of the first movable lens holding portion 37 is provided with a cam pin (not shown) that engages with a first cam groove (not shown). Furthermore, a camshaft 46 is slidably inserted into the guide portion 39a of the second movable lens holding portion 39. The guide portion 39a of the second movable lens holding portion 39 is provided with a cam pin (not shown) that engages with a second cam groove (not shown).

[0033] In the first moving group 22, when the camshaft 46 rotates with the cam pin (not shown) engaged with the first cam groove (not shown), the first movable lens holder 37 moves along the rotational axis direction (optical axis direction) of the camshaft 46 in accordance with the direction of rotation. Furthermore, the first movable lens holder 37 can be stopped and positioned at a predetermined position in the rotational axis direction (optical axis direction) of the camshaft 46. At this time, the connecting portion 37c of the first movable lens holder 37 passes through the connecting portion 33, and the first movable lens 36 moves along the rotational axis direction (optical axis direction) of the camshaft 46 and is positioned at the predetermined position.

[0034] In the second moving group 23, when the camshaft 46 rotates with the cam pin (not shown) engaged with the second cam groove (not shown), the second movable lens holder 39 moves along the rotational axis direction (optical axis direction) of the camshaft 46 in accordance with the direction of rotation. Furthermore, the second movable lens holder 39 can be stopped and positioned at a predetermined position in the rotational axis direction (optical axis direction) of the camshaft 46. At this time, the connecting portion 39c of the second movable lens holder 39 passes through the connecting portion 33, and the second movable lens 38 moves along the rotational axis direction (optical axis direction) of the camshaft 46 and is positioned at a predetermined position. In this way, the first moving group 22 can move the first movable lens 36 along the optical axis direction, and the second moving group 23 can move the second movable lens 38 along the optical axis direction, so that the focal length of the imaging lens 41 can be changed to enable variable magnification imaging and focusing.

[0035] In addition to the sensor 25 described above, the endoscopic imaging device 20 includes, for example, a circuit board 26, a prism 27, and a signal cable 28. The sensor 25 receives light that has passed through the first movable lens 36 of the first moving group 22 and the second movable lens 38 of the second moving group 23, as well as the first fixed lens 34 of the first fixed group 21 and the second fixed lens 40 of the second fixed group 24, and captures an image of the object being observed. As described above, the sensor 25 is disposed at the end 30b of the barrel body 30 on the side opposite to the subject side. In addition, light that passes through the first movable lens 36 of the first moving group 22 and the second movable lens 38 of the second moving group 23, as well as the first fixed lens 34 of the first fixed group 21 and the second fixed lens 40 of the second fixed group 24, is also referred to as light that passes through the imaging lens 41.

[0036] The sensor 25 has a light receiving surface 25a that receives the light that has passed through it. The light that has passed through the imaging lens 41 is, for example, light that forms an image of the object to be observed, and is imaging light of the object to be observed. The sensor 25 captures an image of a subject by, for example, converting light received by the light-receiving surface 25a into an electrical signal through photoelectric conversion. More specifically, in the sensor 25, imaging light of the object to be observed is incident on the light-receiving surface 25a, and the imaging light is photoelectrically converted to capture an image of the subject. The sensor 25 is, for example, a conventionally known photoelectric conversion element, and a CCD (Charge Coupled Device) image sensor or a CMOS (Complementary Metal Oxide Semiconductor) image sensor can be used.

[0037] 2, the sensor 25 is electrically connected to the surface 26a of the circuit board 26, for example, via conductive bumps 29. Furthermore, for example, the sensor 25 is mounted on the circuit board 26 so that the light receiving surface 25a is parallel to the optical axis C of the first fixed lens 34, the first movable lens 36, the second movable lens 38, and the second fixed lens 40. Note that "mounted" means electrically connected. An underfill layer (not shown) may be provided between the sensor 25 and the circuit board 26 to firmly connect the sensor 25 and the circuit board 26 .

[0038] The bumps 29 are made of a metal or an alloy. More specifically, the bumps 29 are made of solder. A bump 29 made of solder is also called a solder ball. Note that the bumps 29 are not limited to solder or the like as long as they can electrically connect the sensor 25 and the circuit board 26. The sensor 25 and the circuit board 26 may also be electrically connected directly. The underfill layer also relieves stress that occurs at the joint between the sensor 25 and the circuit board 26, such as at the bumps 29, due to the difference in thermal expansion coefficient between the sensor 25 and the circuit board 26. The underfill layer firmly connects the sensor 25 and the circuit board 26, increasing the reliability of the electrical connection and resulting in a highly reliable endoscopic imaging device 20. The underfill agent that constitutes the underfill layer is not particularly limited, and any agent that is used as a sealing resin between the sensor 25 and the circuit board 26 can be used as appropriate. For example, a one-component heat-curing epoxy resin is used as the underfill agent. In this case, after the underfill agent is supplied, it is heated and maintained at a predetermined temperature to form the underfill layer.

[0039] The circuit board 26 is a board on which the sensor 25 is mounted. In addition to the sensor 25, for example, an electronic component 50 is mounted on the surface 26a of the circuit board 26. The electronic component 50 is used to drive the sensor 25, and is not particularly limited, but examples thereof include a voltage regulator, a resistor, and a capacitor. The voltage regulator is a device that stabilizes the voltage to the sensor 25 and outputs a constant voltage to the sensor 25. The circuit board 26 shown in FIG. 2 is flat, but is not limited to this. The circuit board 26 is made up of, for example, a printed wiring board, but may also be made up of a flexible board, in which case the circuit board 26 is made up of, for example, a flexible printed circuit board.

[0040] Furthermore, a plurality of connection terminals (not shown) through which signals or power are input and output to and from the sensor 25 and the electronic components 50 are provided on the surface 26a of the circuit board 26. A signal line 28a of the signal cable 28 is electrically connected to the connection terminals. This electrically connects the sensor 25 and the signal cable 28. The sensor 25 converts light into an electrical signal, and this electrical signal is transmitted via the signal cable 28. The signal cable 28 is inserted into the insertion section, operation section, universal cord, etc. of the endoscope, and is electrically connected to the processor device 16 (see FIG. 1).

[0041] 2, the signal cable 28 includes a plurality of signal wires 28a, a covering layer 28b covering each of the signal wires 28a, a shield conductor 28c provided around the entirety of the signal wires 28a covered with the covering layer 28b, and an outer sheath 28d covering the shield conductor 28c. The signal cable 28 is a multi-core cable in which the plurality of signal wires 28a are bundled together, surrounded by the shield conductor 28c, and housed within the cylindrical outer sheath 28d. The outer sheath 28d forms the outer periphery of the signal cable 28. The covering layer 28b, the shield conductor 28c, and the outer sheath 28d are, for example, cylindrical. The shield conductor 28c of the signal cable 28 is called a shield. The signal cable 28 has, for example, five signal lines 28a. The number of signal lines 28a depends on the configuration of the endoscopic imaging device 20 and is not particularly limited, and may be two, three, four, six or more.

[0042] The prism 27 guides light that has passed through the imaging lens 41 to the light receiving surface 25a of the sensor 25. The prism 27 is, for example, a right-angle prism in which the incident surface 27a and the exit surface 27b are perpendicular to each other. The prism 27 also has an inclined surface 27c that connects the incident surface 27a and the exit surface 27b. The inclined surface 27c is the reflecting surface 27e of the prism 27.

[0043] The prism 27 is disposed at the end 30b on the opposite side of the lens housing section 31 from the subject side. The prism 27 is disposed so that the incident surface 27a faces the lens 40c of the second fixed lens 40. The prism 27 is also disposed so that the exit surface 27b faces the light receiving surface 25a of the sensor 25. Also, for example, a cover glass 49 is disposed between the emission surface 27b of the prism 27 and the light receiving surface 25a of the sensor 25. The cover glass 49 protects the light receiving surface 25a of the sensor 25. The prism 27 and the cover glass 49 are bonded together with, for example, a light-curing adhesive. Note that the cover glass 49 may not be provided. Prism 27 bends the light that has passed through imaging lens 41, for example, by 90° at inclined surface 27c, i.e., reflecting surface 27e, to change the optical path, and guides the light to light-receiving surface 25a of sensor 25. Light that has passed through imaging lens 41 enters prism 27, and the light that has passed through inclined surface 27c of prism 27, i.e., imaging lens 41, is reflected by reflecting surface 27e and is then incident on light-receiving surface 25a of sensor 25. The light that has passed through imaging lens 41 contains information about the object being observed.

[0044] In the endoscopic imaging device 20, the observation image captured by the sensor 25 through the imaging lens 41 is focused on the light receiving surface 25a of the sensor 25 and converted into an electrical signal. This electrical signal is output to the processor device 16 (see Figure 1) via the signal cable 28, converted into a video signal, and the observation image is displayed on a monitor connected to the processor device 16.

[0045] <Adjustment group> The adjustment group 24a will be described below. Fig. 3 is a schematic side cross-sectional view showing a first example of an adjustment group of an endoscopic imaging device according to an embodiment of the present invention, and Fig. 4 is a schematic plan view showing the first example of an adjustment group of an endoscopic imaging device according to an embodiment of the present invention. The gripping portion 44 shown in Fig. 3 is the first example of a gripping portion. Fig. 4 is a view of Fig. 3 as seen from the gripping portion 44 side. Note that in Figs. 3 and 4, the same components as those in the endoscopic imaging device 20 shown in Fig. 2 are designated by the same reference numerals, and detailed description thereof will be omitted. 3 has a fixed lens holding member 42. The fixed lens holding member 42 has a cylindrical holding portion 43 in which the second fixed lens 40 is provided in an interior 43a. The holding portion 43 has a gripping portion 44 provided at one end 43b of the holding portion 43, and an end face 43g provided at the other end 43c opposite the one end 43b in the optical axis direction. The gripping portion 44 has a convex portion or a concave portion whose diameter changes in the radial direction Dr of the holding portion 43. The gripping portion 44 is, for example, a flange portion 44a that protrudes further in the radial direction Dr of the second fixed lens 40 than the holding portion 43. The flange portion 44a is provided to surround the periphery of the holding portion 43. In addition, the flange portion 44a is provided with a recess 44b that surrounds the periphery of the holding portion 43.

[0046] The flange portion 44a protrudes from the side surface 43e of the holding portion 43, and has a diameter that is larger in the radial direction Dr of the holding portion 43. The flange portion 44a corresponds to a protrusion. The diameter of the recess 44b is smaller in the radial direction Dr of the holder 43. As shown in Fig. 3, the recess 44b is parallel to the central axis CL of the holder 43, and the cross-sectional shape of the recess 44b in a cross section including the central axis CL is, for example, rectangular, and the bottom surface on the inner side 43a side is flat. The radial direction Dr of the holder 43 is the same as the radial direction Dr of the second fixed lens 40. The gripping portion 44 is used to move the adjustment group 24a in the optical axis direction. For example, a jig (not shown) is hooked onto the flange portion 44a or the recessed portion 44b to move the adjustment group 24a in the optical axis direction. This makes it possible to adjust the position of the fixed lens along the optical axis C, for example, when the required optical performance cannot be obtained, and adjust the field of view as an optical performance. After adjusting the position of the fixed lens along the optical axis C, the adjustment group 24a is fixed to the barrel main body 30 using, for example, an adhesive. The field of view angle can be adjusted, for example, while video data generated by the processor device 16 (see FIG. 1) is displayed on a monitor (not shown). In this way, by designating at least one of the fixed groups as the adjustment group 24a, it becomes possible to adjust the position of the fixed lens along the optical axis C. This makes it possible to adjust the position of the fixed lens along the optical axis C, for example, when the required optical performance cannot be obtained.

[0047] Furthermore, because the holder 43 is cylindrical, the adjustment group 24a can be rotated around the central axis Cf, which serves as the axis of rotation. This allows for circumferential adjustment of the second fixed lens 40, making it possible to adjust the optical performance, such as MTF and lens decentering. After adjusting the circumferential position of the second fixed lens 40, the adjustment group 24a is fixed to the barrel main body 30 using, for example, an adhesive. The flange portion 44a preferably has at least one convex portion, concave portion, or hole in the circumferential direction Rf of the central axis Cf of the holding portion 43, the diameter of which varies with respect to the radial direction Dr of the holding portion 43. The circumferential direction Rf of the central axis Cf of the holding portion 43 is also simply referred to as the circumferential direction Rf of the holding portion 43. 4, the four recesses 44c are preferably provided at equal intervals in the circumferential direction Rf of the holding portion 43. That is, the recesses 44c are preferably provided at 90° intervals around the central axis Cf. The diameters of the recesses 44c are smaller in the radial direction Dr of the holding portion 43. The recess 44c has, for example, a rectangular opening and a flat bottom surface on the inner side 43a side. The circumferential direction Rf of the central axis Cf of the holder 43 is also the circumferential direction Rf of the second fixed lens 40. By hooking a jig (not shown) into the recess 44c, the adjustment group 24a can be easily rotated around the central axis Cf, which makes it easy to adjust the optical performance such as MTF and lens decentering.

[0048] Furthermore, a ring member 43d is provided at the other end 43c in the opening of the holding portion 43. The ring member 43d closes a portion of the opening of the holding portion 43. The ring member 43d functions as a stopper for retaining the lens 40a in the interior 43a. In the first example of the endoscopic imaging device, an end face 43h opposite to one end 43b of the ring member 43d in the optical axis direction is the end face 43g provided at the other end 43c of the holding portion 43 described above.

[0049] 2, adjustment group 24a is arranged such that end face 43g provided at the other end 43c of holding portion 43 is spaced apart from barrel main body 30 in the optical axis direction. As described above, end face 43g provided at the other end 43c of holding portion 43 is end face 43h of ring member 43d, and is a different surface from side face 43e. End face 43g provided at the other end 43c of holding portion 43 (end face 43h of ring member 43d of holding portion 43) does not contact any part of barrel main body 30 in the optical axis direction. There is a gap Sa between end face 43g provided at the other end 43c of holding portion 43 of adjustment group 24a (end face 43h of ring member 43d of holding portion 43) and barrel main body 30 in the optical axis direction. Furthermore, grip portion 44 is disposed at a position separated from barrel main body 30 in the optical axis direction and protrudes from barrel main body 30. Flange portion 44a, which is grip portion 44 of adjustment group 24a, does not contact any part of barrel main body 30 in the optical axis direction. There is a gap Sb between grip portion 44 and barrel main body 30 in the optical axis direction. In this state, side surface 43e of holding portion 43 is fixed to barrel main body 30. The portion where the support portion 32d of the barrel main body 30 and the side surface 43e of the holding portion 43 of the adjustment group 24a come into contact is the mating portion Rg. Furthermore, if the adjustment group 24a has a protruding part such as the flange portion 44a, in addition to the ring member 43d of the adjustment group 24a described above, the flange portion 44a, which is the gripping portion 44 of the adjustment group 24a, does not come into contact with any part of the barrel main body 30 in the optical axis direction. As described above, in the adjustment group 24a, the end face 43g provided on the other end 43c of the holding portion 43 is positioned at a position away from the barrel main body 30 in the optical axis direction, and the gripping portion 44 is positioned at a position away from the barrel main body 30 in the optical axis direction, and the state in which it protrudes from the barrel main body 30 is simply referred to as the set position of the holding portion 43.

[0050] The barrel body 30 and the adjustment group 24a are fixed together using, for example, an adhesive. When they are fixed together, the adhesive is in a hardened state. There are no particular limitations on the adhesive, and for example, a photo-curing adhesive or an instant adhesive is used. This allows the barrel body 30 and the adjustment group 24a to be fixed reliably in a short time while maintaining the positional relationship between them. This makes manufacturing easier, and fewer jigs are required to fix the barrel body 30 and the adjustment group 24a. The photocurable adhesive is an adhesive that is cured by, for example, ultraviolet light with a wavelength of about 100 to 400 nm, visible light with a wavelength of more than 400 and less than 780 nm, or infrared light with a wavelength of about 780 nm to 1 mm. The photocurable adhesive is, for example, an epoxy resin-based photocurable adhesive, an acrylic resin-based photocurable adhesive, or a silicone-based photocurable adhesive.

[0051] In the endoscopic imaging device 20 shown in Figure 2, of the first fixed group 21 and the second fixed group 24, the second fixed group 24 is set as the adjustment group 24a, but this is not limited to this, and the first fixed group 21 may be set as the adjustment group instead of the second fixed group 24. Furthermore, both the first fixed group 21 and the second fixed group 24 may be adjustment groups. By using both the first fixed group 21 and the second fixed group 24 as adjustment groups, even more adjustments become possible.

[0052] [Second Example of Endoscopic Imaging Device] Fig. 5 is a schematic cross-sectional side view showing a second example of an endoscopic imaging device according to an embodiment of the present invention, and Fig. 6 is a schematic cross-sectional side view showing an enlarged view of the first fixed group and adjustment group of the second example of an endoscopic imaging device according to an embodiment of the present invention. Note that in Figs. 5 and 6, the same components as those in the endoscopic imaging device 20 shown in Fig. 2 are designated by the same reference numerals, and detailed description thereof will be omitted. The endoscopic imaging device 20a shown in Figure 5 differs from the endoscopic imaging device 20 shown in Figure 2 in that it has one movable group 60, the adjustment group 62a is fixed to the first fixed group 21, and the first fixed lens 34 has one lens 34a, but otherwise has the same configuration as the endoscopic imaging device 20 shown in Figure 1. Endoscope imaging device 20a has first fixed group 21, adjustment group 62a, and moving group 60 arranged in this order along the direction from end 30a on the subject side of barrel body 30 toward end 30b on the sensor 25 side. First fixed group 21 is arranged at end 30a on the observation subject side of barrel body 30. Adjustment group 62a and moving group 60 are arranged inside barrel body 30. Adjustment group 62a is the second fixed group 62.

[0053] The first fixed group 21 has a first fixed lens 34 and a lens holding member 35 that holds the first fixed lens 34. The first fixed lens 34 is made up of, for example, one lens 34a. As described above, the lens holding member 35 has the cylindrical holding portion 35a, the flange 35b, and the cylindrical storage portion 35c. The storage portion 35c is fitted into the subject-side end surface 30c of the lens storage portion 31. The lens 34a is held in the holding portion 35a, and the adjustment group 62a is stored in the storage portion 35c. The moving group 60 is provided on the sensor 25 side of the adjustment group 62a. The adjustment group 62a will be described in detail later. The moving group 60 has the same configuration as the second moving group 23 of the endoscopic imaging device 20 shown in FIG.

[0054] The adjustment group 62a has a second fixed lens 63 and a fixed lens holding member 42, similar to the adjustment group 24a of the endoscopic imaging device 20 shown in Fig. 1. The second fixed lens 63 has, for example, three lenses 63a, 63b, and 63c. The three lenses 63a, 63b, and 63c are aligned with their optical axes C and are held collectively by a single fixed lens holding member 42 in a state where their positions are fixed with respect to the optical axis C. For example, of the three lenses 63a, 63b, and 63c, the lenses 63a and 63b are the lenses 34a and 34b of the first fixed lens 34 described above. In the endoscopic imaging device 20a, the imaging lens 41 is configured by the first fixed lens , the second fixed lens 63, and the second movable lens .

[0055] 5 and 6, the adjustment group 62a is arranged such that the end face of the holder 43 opposite the sensor 25 (see FIG. 2) is spaced apart in the optical axis direction from the lens holder 35. In the second example of the endoscopic imaging device, as in the first example of the endoscopic imaging device described above, the end face 43g provided on the other end 43c (see FIG. 6) of the holder 43 is the end face 43h of the ring member 43d. An end face 43g (end face 43h of the ring member 43d) provided at the other end 43c of the holding portion 43 does not contact any part of the lens holding member 35 in the optical axis direction. There is a gap Sa between the end face 43g (end face 43h of the ring member 43d of the adjustment group 62a) provided at the other end 43c of the holding portion 43 and the lens holding member 35 in the optical axis direction. The grip portion 44 is disposed at a position separated from the lens holding member 35 in the optical axis direction and protrudes from the lens holding member 35. In the endoscopic imaging device 20a, a flange portion 44a serving as the grip portion 44 protrudes from the storage portion 35c of the lens holding member 35 toward the sensor 25. Flange portion 44a, which is grip portion 44 of adjustment group 62a, is located closer to sensor 25 than storage portion 35c and does not contact any part of lens holding member 35 in the optical axis direction. There is a gap Sb between grip portion 44 and barrel main body 30 in the optical axis direction. In this state, side surface 43e of holding portion 43 is fixed to lens holding member 35. The portion where storage portion 35c of lens holding member 35 and side surface 43e of holding portion 43 of adjustment group 62a contact is engagement portion Rg. Furthermore, as described above, when the adjustment group 62a has a protruding part such as the flange portion 44a, in addition to the ring member 43d of the adjustment group 62a described above, the flange portion 44a, which is the gripping portion 44 of the adjustment group 62a, does not come into contact with any part of the first fixed group 21 in the optical axis direction.

[0056] In the endoscopic imaging device 20a, the adjustment group 62a is similar to the adjustment group 24a of the endoscopic imaging device 20 shown in Fig. 2, for example, by hooking a jig (not shown) into the recess 44b to move the adjustment group 62a in the optical axis direction. This makes it possible to adjust the position of the fixed lens along the optical axis C, for example, when the required optical performance cannot be obtained, and the field of view can be adjusted as an optical performance. After adjusting the position of the fixed lens along the optical axis C, the adjustment group 62a is fixed to the lens holding member 35 of the first fixed group 21 using, for example, an adhesive. Furthermore, because the holder 43 is cylindrical, the adjustment group 62a can be rotated around the central axis Cf, which serves as the axis of rotation. This allows the second fixed lens 63 to be adjusted in the circumferential direction, and the optical performance, such as MTF and lens decentering, can be adjusted. After adjusting the circumferential position of the second fixed lens 63, the adjustment group 62a is fixed to the lens holding member 35 of the first fixed group 21 using, for example, an adhesive. Furthermore, by hooking a jig onto the recess 44c (see FIG. 4) of the flange portion 44a, which is the grip portion 44, the adjustment group 62a can be easily rotated around the central axis Cf. The adhesive used to bond the adjustment group 62a and the lens holding member 35 of the first fixed group 21 can be the same as the adhesive used to fix the lens barrel main body 30 and the adjustment group 24a.

[0057] In the endoscopic imaging device 20a shown in Figures 5 and 6, of the first fixed group 21 and the second fixed group 62, the second fixed group 62 is set as the adjustment group 62a, but this is not limited to this, and the first fixed group 21 may also be set as the adjustment group. Furthermore, both the first fixed group 21 and the second fixed group 62 may be adjustment groups. By using both the first fixed group 21 and the second fixed group 62 as adjustment groups, more adjustments become possible.

[0058] <Other examples of adjustment groups> Fig. 7 is a schematic partial cross-sectional side view showing a second example of a gripping portion of an adjustment group of an endoscopic imaging device according to an embodiment of the present invention. Fig. 8 is a schematic partial cross-sectional side view showing a third example of a gripping portion of an adjustment group of an endoscopic imaging device according to an embodiment of the present invention. Fig. 9 is a schematic plan view showing the third example of a gripping portion of an adjustment group of an endoscopic imaging device according to an embodiment of the present invention. Fig. 10 is a schematic partial cross-sectional side view showing a fourth example of a gripping portion of an adjustment group of an endoscopic imaging device according to an embodiment of the present invention, and Fig. 11 is a schematic partial cross-sectional side view showing a fifth example of a gripping portion of an adjustment group of an endoscopic imaging device according to an embodiment of the present invention. Fig. 12 is a schematic plan view showing the fifth example of a gripping portion of an adjustment group of an endoscopic imaging device according to an embodiment of the present invention. Fig. 13 is a schematic plan view showing a sixth example of a gripping portion of an adjustment group of an endoscopic imaging device according to an embodiment of the present invention. 7 to 13, the same components as those in the adjustment group 24a shown in FIGS. 3 and 4 are denoted by the same reference numerals, and detailed description thereof will be omitted.

[0059] The configuration of the gripping portion 44 of the adjustment group is not limited to the configuration having the flange portion 44a and recessed portion 44b described above. For example, the gripping portion 44 may be configured to include a recessed portion 64a as shown in FIG. 7. The recessed portion 64a is disposed, for example, on the side surface 43e of the holding portion 43 so as to surround the periphery of the holding portion 43. The recessed portion 64a is parallel to the central axis CL (see FIG. 3) of the holding portion 43 (see FIG. 3), and has a cross-sectional shape in a cross section including the central axis CL that is, for example, rectangular, and the bottom surface 64e on the inner portion 43a side is flat. As shown in Fig. 8, the gripping portion 44 may be configured to include a recess 64b. The recess 64b is arranged, for example, on the side surface 43e of the holding portion 43, surrounding the periphery of the holding portion 43. The recess 64b is parallel to the central axis CL (see Fig. 3) of the holding portion 43 (see Fig. 3), and has a cross-sectional shape in a cross section including the central axis CL that is, for example, a triangle, with the apex facing the interior 43a. A bottom 64f on the interior 43a side corresponds to the apex of the cross-sectional shape of the recess 64b. The cross-sectional shape of the recess is not limited to the above-mentioned quadrangle and triangle, and the bottom surface on the inner side 43a side may be a curved surface.

[0060] 7 and 8, when the gripping portion 44 has recesses 64a and 64b, the two recesses 64a and 64b are provided symmetrically with respect to a line Lc passing through the central axis Cf of the holding portion 43, as shown in Fig. 9. The recesses 64a and 64b extend, for example, in a direction parallel to the extension direction of the line Lc. The recesses 64a and 64b are not provided over the entire circumferential direction Rf of the holding portion 43, but are provided partially in the holding portion 43. By hooking a jig into the recesses 64a and 64b, the adjustment group can be easily moved in the optical axis direction and can also be easily rotated around the central axis Cf of the holding portion 43. The recesses 64a, 64b are not particularly limited to the configuration shown in Fig. 9. For example, four recesses 64a, 64b may be provided at equal intervals in the circumferential direction Rf of the holding portion 43, that is, at 90° intervals around the central axis Cf of the holding portion 43. As shown in Figures 7 and 8, when the gripping portion 44 has recesses 64a and 64b and the adjustment group is in the set position of the holding portion 43 described above, the recesses 64a and 64b of the gripping portion 44 are positioned at a distance in the optical axis direction from the lens barrel main body or the fixed group, protrude from the lens barrel main body or the fixed group, and are not in contact with any part of the lens barrel main body or the fixed group.

[0061] 10, the gripping portion 44 may be configured to include a flange portion 64c. The flange portion 64c is disposed on an end portion 43f of the side surface 43e of the holding portion 43 opposite the ring member 43d of the holding portion 43, surrounding the periphery of the holding portion 43. The flange portion 64c is parallel to the central axis CL (see Figure 3) of the holding portion 43 (see Figure 3), and the cross-sectional shape in a cross section including the central axis CL is, for example, rectangular, and the surface opposite to the interior 43a is flat. 11, the gripping portion 44 may be configured to include a flange portion 64d. The flange portion 64d is arranged on the side surface 43e of the holding portion 43 so as to surround the periphery of the holding portion 43. The flange portion 64d is parallel to the central axis CL (see FIG. 3) of the holding portion 43 (see FIG. 3), and has a cross-sectional shape in a cross section including the central axis CL that is, for example, rectangular, and the surface opposite the interior 43a is flat. 10 and 11 both protrude from the side surface 43e of the holding portion 43, and have a larger diameter in the radial direction Dr of the holding portion 43. The flange portions 64c and 64d correspond to protrusions. The configuration having the flange portions 64c, 64d as shown in Figures 10 and 11 is, for example, a configuration in which four flange portions 64c, 64d are provided at equal intervals in the circumferential direction Rf of the holder 43 as shown in Figure 12. That is, the flange portions 64c, 64d are provided at 90° intervals around the central axis Cf of the holder 43. By hooking a jig onto the flange portions 64c, 64d, the adjustment group can be easily moved in the optical axis direction. In addition, it can be easily rotated around the central axis Cf of the holder 43.

[0062] 13, the gripping portion 44 of the adjustment group may be configured with a hole 66 in a flange portion 65. At least one hole 66 may be provided around the periphery of the holding portion 43. For example, when multiple holes 66 are provided, the holes 66 are spaced apart in the circumferential direction Rf (see FIG. 12) of the holding portion 43 so that the holes 66 do not communicate with each other. The configuration of the grip portion 44 of the adjustment group is not limited to the configuration in which the flange portion 65 has the hole 66 as shown in FIG. 13, but may have only the hole 66 without the flange portion 65. The holes 66 are, for example, circular, but are not limited to this and may be polygonal other than circular, or may be oval extending along the circumferential direction Rf, for example.

[0063] The present invention is basically configured as described above. Although the endoscopic imaging device and endoscope of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and various improvements and modifications may be made without departing from the spirit and scope of the present invention. [Explanation of symbols]

[0064] 10 Endoscopy System 12 Endoscopy 12a Tip 14 Light source device 16 Processor Unit 18 Tip body 18a Tip surface 18c Observation window 20, 20a Endoscopic imaging device 21 First fixed group 22 First Mobile Group 23 Second Mobile Group 24, 62 Second fixed group 24a, 62a adjustment group 25 sensors 25a Photosensitive surface 26 Circuit Board 26a surface 27 Prism 27a Entrance plane 27b Output surface 27c slope 27e reflective surface 28 Signal Cable 28a signal line 28b Covering layer 28c shielded conductor 28d Hull 29 Bump 30 Lens barrel body 30a, 30b end 30c end face 31 Lens storage compartment 32 Housing 32a End face 32c Locking ring 32d support part 33 Connecting part 34 First fixed lens 34a, 34b, 34c lenses 35 Lens holding member 35a Holding part 35b flange 35c storage compartment 36 First movable lens 37 First movable lens holder 37a Guide part 37b Lens frame 37c connection part 38 Second movable lens 38a, 38b, 40a, 40b, 40c, 63a, 63b, 63c lenses 39 Second movable lens holder 39a Guide part 39b Lens frame 39c connection part 40, 63 Second fixed lens 41 Imaging lens 42 Fixed lens holding member 43 Holding part 43a internal 43b, 43c end 43d Ring member 43e side 43f end 43g, 43h end face 44 Gripping part 44a Flange 44b, 44c recess 45 Lens drive unit 46 Camshaft 46a tip 46b flange 46c end 47 Driving member 48 Tip support part 49 Coverslip 50 Electronic Components 60 Mobile Group 64a, 64b recesses 64c, 64d, 65 flange 64e bottom 64f bottom 66 holes Lc straight line C optical axis CL, Cf, Ct center axis Cd rotation axis Dr radial direction Rf circumferential direction Rg mating part Sa, Sb gap

Claims

1. An endoscopic imaging device for acquiring an image of an observation object, At least one moving group including a movable lens movable along an optical axis; a plurality of fixed groups each including a fixed lens whose position is fixed with respect to the optical axis; a sensor that receives light that has passed through the movable lens of the moving group and the fixed lens of the fixed group and captures an image of the observation target; a lens driving unit that moves the moving group along the optical axis; a lens barrel body in which the movable group, the fixed group, and the lens drive unit are provided, At least one group among the plurality of fixed groups is an adjustment group; the adjustment group includes a cylindrical holding portion in which the fixed lens is provided, the holding portion includes a gripping portion provided at one end of the holding portion and an end face provided at the other end opposite to the one end in the optical axis direction, the gripping portion includes a convex portion or a concave portion whose diameter changes in a radial direction of the holding portion, an endoscope imaging device in which the end face provided at the other end of the holding portion is positioned at a position separated from the barrel body or the fixed group in the optical axis direction, and the grip portion is positioned at a position separated from the barrel body or the fixed group in the optical axis direction and protrudes from the barrel body or the fixed group, and a side surface of the holding portion is fixed to the barrel body or the fixed group.

2. The endoscopic imaging apparatus according to claim 1 , wherein the adjustment group is provided at an end of the barrel body on the observation object side or at an end of the barrel body on the sensor side.

3. The endoscopic imaging device according to claim 1 , wherein the gripping portion includes at least one convex portion, concave portion, or hole in a circumferential direction of the holding portion, the diameter of which varies in the radial direction of the holding portion.

4. The endoscopic imaging apparatus according to claim 1 , wherein among the plurality of fixed groups, the fixed groups other than the adjustment group are mechanically positioned in the optical axis direction.

5. 3. The endoscopic imaging apparatus according to claim 2, wherein the fixed group is provided at an end of the barrel body on the observation object side, and the adjustment group is provided at an end of the barrel body on the sensor side.

6. An endoscope comprising the endoscopic imaging device according to claim 1 or 2.

Images