CN112438689A

CN112438689A - Endoscope imaging device and endoscope

Info

Publication number: CN112438689A
Application number: CN202010918661.8A
Authority: CN
Inventors: 浅冈卓郎
Original assignee: Fujifilm Corp
Current assignee: Fujifilm Corp
Priority date: 2019-09-05
Filing date: 2020-09-03
Publication date: 2021-03-05
Also published as: JP7181170B2; JP2021037200A

Abstract

The invention provides an endoscope image pickup device and an endoscope which can restrain the size from being enlarged and realize firm fixation. The endoscope image pickup device includes: a lens barrel having an imaging lens provided therein; an imaging element that receives light having passed through the imaging lens and performs photoelectric conversion; at least 1 glass component, dispose between lens-barrel and imaging element; a holding member that connects the glass member and the lens barrel; a signal cable electrically connected to the imaging element; and an engaging portion that holds the connecting member of the signal cable with respect to the holding member and engages the holding member with the connecting member. The engaging portion has at least 1 convex portion provided on the holding member and a concave portion provided on the connecting member and engaged with the convex portion of the holding member.

Description

Endoscope imaging device and endoscope

Technical Field

The present invention relates to an endoscopic imaging apparatus and an endoscope for acquiring an image of an observation target, and more particularly to an endoscopic imaging apparatus and an endoscope having an engagement portion for engaging a holding member for coupling a glass member and a lens barrel with a coupling member for holding a signal cable with respect to the holding member.

Background

In recent medical treatment, diagnosis and the like using an endoscope system including a light source device for an endoscope, an endoscope (endoscope scope), and a processor device are widely performed.

The endoscope has an insertion portion to be inserted into a body of a subject, and illumination light from the light source device for endoscope is irradiated to an observation target through the insertion portion. The endoscope captures an observation object irradiated with illumination light by an imaging element and generates an image signal. The processor device performs image processing on an image signal generated by the endoscope to generate an observation image for display on the display. The imaging element is electrically connected to a signal cable via the flexible wiring substrate, and the signal cable is electrically connected to the processor device. In an endoscope, it is desirable that an insertion portion to be inserted into a subject is thin in order to reduce a physical burden on the subject.

Further, although the imaging element, the lens barrel, and the like are provided at the distal end of the insertion portion, the distal end of the insertion portion is also bent in order to perform various kinds of imaging when the endoscope is used. At this time, since the distal end of the insertion portion inserted into the body is bent in a state where the imaging element, the lens barrel, and the like are provided as described above, a force is applied to the joint portion of each member, and an operation such as separation of the joint portion may occur. In order to suppress operations such as peeling, endoscopes that are firmly joined have been proposed.

For example, patent document 1 discloses an electronic endoscope provided with a coupling member that couples a lens barrel and a signal cable and covers at least one surface of a prism. In the electronic endoscope of patent document 1, an end portion of a cable cover of the signal cable is bonded to an inner side of one end portion of the coupling member by an adhesive, and a pair of claw portions formed at the other end portion of the coupling member are engaged with a flange portion of the lens barrel. Therefore, even if the signal cable is pulled in a direction away from the connecting member, the joint between the signal cable and the circuit board is not peeled off, and the signal cable is not disconnected.

Patent document 2 describes an endoscope including an image area sensor that photoelectrically converts an optical image formed through a photographing lens, a flexible substrate electrically connected to the image area sensor, a signal cable electrically connected to the flexible substrate, a prism holder that holds the photographing lens or the prism, a connecting member that connects the prism holder and the signal cable, one end of which is fixed to the signal cable and the other end of which is provided with a claw portion locked to the prism holder, and a ring member attached to at least a part of the outer periphery of the prism holder, wherein the ring member is fixed to a main body of the endoscope. With this configuration, the optical component holding portion is prevented from being deformed by an external force via the coupling member.

Patent document 1: japanese laid-open patent publication No. 2012-157472

Patent document 2: japanese patent laid-open publication No. 2016-158770

In both patent document 1 and patent document 2, a claw portion is used for fixation. In order to firmly fix the endoscope by the claw portion as in patent documents 1 and 2, the claw portion needs to be enlarged because the claw portion is suspended, and the insertion portion of the endoscope needs to be enlarged. However, as described above, as an endoscope, a thin insertion portion is desired in view of a small physical burden on a subject. Thus, it is difficult to achieve firm fixation without increasing the size of the claw portion.

Disclosure of Invention

The invention aims to provide an endoscope image pickup device and an endoscope which can restrain the size from being enlarged and realize firm fixation.

In order to achieve the above object, the present invention provides an endoscopic imaging apparatus including: a lens barrel having an imaging lens provided therein; an imaging element that receives light having passed through the imaging lens and performs photoelectric conversion; at least 1 glass component, dispose between lens-barrel and imaging element; a holding member that connects the glass member and the lens barrel; a signal cable electrically connected to the imaging element; a connecting member that holds the signal cable with respect to the holding member; and an engaging portion that engages the holding member with the connecting member, the engaging portion having at least 1 protruding portion provided on the holding member and a recessed portion provided on the connecting member that engages with the protruding portion of the holding member.

Preferably, the convex portions of the holding member face each other, 2 pieces of the holding member are provided with the glass member therebetween, the connecting member has 1 pair of arm portions facing each other, a concave portion is provided at the tip of each arm portion, and the concave portion at the tip of the arm portion of the connecting member is engaged with the convex portion of the holding member.

Preferably, the convex portion of the holding member covers at least a part of the side surface of the glass member.

Preferably, at least 1 of the glass members has a prism having an incident surface orthogonal to an exit surface, the prism is disposed such that the incident surface faces the imaging lens and the exit surface faces the imaging element, and the convex portions of the holding member are disposed such that the convex portions face each other with side surfaces orthogonal to the incident surface and the exit surface of the prism interposed therebetween.

Preferably, the 1 pair of arm portions are curved so that the leading ends thereof are closer to each other than the base ends thereof.

Preferably, the recess includes an opening portion therethrough.

Further, an endoscope having the endoscopic imaging apparatus of the present invention is provided.

Effects of the invention

According to the present invention, it is possible to provide an endoscopic imaging apparatus and an endoscope including the endoscopic imaging apparatus, which can realize a firm fixation while suppressing an increase in size.

Drawings

Fig. 1 is a schematic perspective view showing an example of an endoscope system including an endoscope according to an embodiment of the present invention.

Fig. 2 is a schematic perspective view showing example 1 of an endoscopic imaging device of an endoscope according to an embodiment of the present invention.

Fig. 3 is a schematic perspective view showing example 1 of an endoscopic imaging device of an endoscope according to an embodiment of the present invention.

Fig. 4 is a schematic side view showing example 1 of an endoscopic imaging device of an endoscope according to an embodiment of the present invention.

Fig. 5 is a schematic perspective view showing a coupling member of example 1 of an endoscopic imaging device of an endoscope according to an embodiment of the present invention.

Fig. 6 is a schematic diagram showing an example of a circuit board of example 1 of the endoscopic imaging apparatus according to the embodiment of the present invention.

Fig. 7 is a schematic perspective view showing example 2 of an endoscopic imaging device of an endoscope according to an embodiment of the present invention.

Fig. 8 is a schematic side view showing example 2 of an endoscopic imaging device of an endoscope according to an embodiment of the present invention.

Description of the symbols

10-endoscope system, 12-endoscope, 12 a-insertion section, 12 b-operation section, 12 c-universal cord, 12 d-connector, 12 e-tip section, 12 f-tip section, 13 a-angle knob, 13 b-zoom operation section, 13 c-mode selector switch, 14-light source device, 16-processor device, 18-monitor, 19-operation input section, 20, 21-endoscopic imaging device, 22-lens barrel, 23-imaging lens, 24-holding member, 24 a-mounting barrel section, 24 b-base section, 24c, 24 d-projection section, 24 e-back section, 25-imaging element, 26-circuit board, 26 a-surface, 26 b-back section, 26 c-1 st bending section, 26 d-2 nd bend, 27 a-1 st bend, 27 b-2 nd bend, 28-signal cable, 29-signal line, 30-connecting member, 32-engaging portion, 33-cover glass, 34-prism, 34C-side, 36-electronic part, 40 a-holding portion, 40 b-arm, 40C-opening, 40 d-opening, 40 e-inside, 40 f-base portion, 41 a-base end, 41 b-front end, 50-circuit board, 50 a-base portion, 50 b-support portion, 50C-surface, 50 d-support surface, C-optical axis.

Detailed Description

Hereinafter, an endoscopic imaging apparatus and an endoscope according to the present invention will be described in detail with reference to preferred embodiments shown in the drawings.

The drawings described below are exemplary drawings for describing the present invention, and the present invention is not limited to the drawings described below.

The angles and the like described below are included in an error range generally allowed in the art.

[ endoscope System ]

The endoscope system irradiates illumination light (not shown) to an observation site such as the inside of a body of a subject to be observed, images the observation site, generates a display image of the observation site from an image signal obtained by the imaging, and displays the display image.

Here, fig. 1 is a schematic perspective view showing an example of an endoscope system including an endoscope according to an embodiment of the present invention.

As shown in fig. 1, the endoscope system 10 includes: an endoscope 12 that images an observation site in a living body (in a subject) as an observation target; an endoscope light source device (hereinafter simply referred to as a light source device) 14 that supplies illumination light for irradiating an observation site to the endoscope 12; a processor device 16 that generates a display image of the observation site from the image signal obtained by the photographing; and a monitor 18 for displaying the display image. An operation input unit 19 such as a keyboard and a mouse is connected to the processor device 16.

The endoscope 12 includes an insertion portion 12a to be inserted into a subject such as a body of a patient, and an operation portion 12b provided at a proximal end portion of the insertion portion 12 a. In the endoscope 12, the insertion portion 12a side is a distal end side. The universal cord 12c is connected to the operation portion 12b of the endoscope 12. The universal cord 12c is connected to the light source device 14 via a connector 12 d. The light source device 14 is connected to the processor device 16.

The processor device 16 receives an image signal output from an endoscopic imaging device 20 (see fig. 2 and 3) of the endoscope 12 via a universal cord 12c, generates an image signal, and outputs the image signal to the monitor 18. Thereby, a display image of the observation site such as the inside of the body is displayed on the monitor 18.

The operation section 12b of the endoscope 12 is connected to the light source device 14 as described above. Light is supplied from the light source device 14 to the distal end portion 12e of the endoscope 12 and emitted from the distal end surface 12 f. The distal end portion 12e of the endoscope 12 can perform a bending operation.

The operating portion 12b is provided with an angle knob 13 a. The user operates the corner piece knob 13a to bend the distal end portion 12e so that the distal end portion 12e can be oriented in various directions.

The operation unit 12b is provided with a forceps opening for inserting a treatment tool, an air/water supply button operated when air or water is supplied from an air/water supply nozzle, a freeze button (not shown) for capturing a still image, a zoom operation unit 13b, and a mode switching switch 13c, in addition to the corner button 13 a. The zoom operation unit 13b is used for zooming in or zooming out an observation target. The mode selector switch 13c is used to switch the observation mode when the endoscope system 10 has a plurality of observation modes.

[ 1 st example of endoscopic imaging device ]

Fig. 2 and 3 are schematic perspective views showing example 1 of an endoscopic imaging device of an endoscope according to an embodiment of the present invention. In fig. 2 and 3, the endoscopic imaging device is oriented differently, showing different side surfaces. Fig. 4 is a schematic side view showing example 1 of an endoscopic imaging device of an endoscope according to an embodiment of the present invention.

An endoscopic imaging device 20 shown in fig. 2 and 3 is mounted on a distal end portion 12e of an insertion portion 12a of an endoscope system 10 shown in fig. 1.

The endoscopic imaging apparatus 20 acquires an image of an observation target, and includes, for example, a lens barrel 22, a holding member 24, an imaging element 25, a circuit board 26 on which the imaging element 25 is mounted, and a coupling member 30 which holds a signal cable 28 with respect to the holding member 24. The endoscopic imaging device 20 further includes an engagement portion 32 for engaging the holding member 24 with the coupling member 30.

The signal cable 28 is electrically connected to the imaging element 25, and the imaging element 25 is electrically connected to the processor device 16 (refer to fig. 1) via the circuit board 26 and the signal cable 28. The signal cable 28 is disposed within the universal cord 12c (see fig. 1). The structure of the signal cable 28 is not particularly limited. The signal cable 28 is, for example, a multi-core cable in which a plurality of signal wires 29 are bundled, a shield conductor is provided around the signal wires, and the signal wires are accommodated in a cylindrical sheath. The number of the signal lines 29 is 4, for example. The number of signal lines is not particularly limited, and may be 2, 3, or 5 or more.

The lens barrel 22 is a cylindrical member, and an imaging lens 23 for photographing an observation target is provided therein. The structure of the imaging lens 23 is not particularly limited, and may be a structure having a plurality of lenses arranged in parallel in the direction of the optical axis C, or may be a structure having 1 lens.

Here, as shown in fig. 2 and 3, a direction parallel to the optical axis C is referred to as an X direction. Of the 2 directions orthogonal to the optical axis C, 1 direction is set as the Y direction, and the remaining directions are set as the Z direction. The Y direction corresponds to the width direction of the endoscopic imaging device 20, and the Z direction corresponds to the height direction of the endoscopic imaging device 20.

The holding member 24 has a cylindrical mounting tube portion 24a fitted to the outer periphery of the lens barrel 22, and a base portion 24b connected to the mounting tube portion 24a and integrally provided. A prism 34 is provided on the back surface 24e of the base 24 b. The holding member 24 connects a glass member such as the prism 34 to the lens barrel 22.

The prism 34 is, for example, a right-angle prism in which the incident surface 34a and the exit surface 34b are orthogonal to each other. The incident surface 34a is disposed toward the back surface 24e of the base 24 b. Thereby, the incident surface 34a faces the imaging lens 23.

A cover glass 33 is disposed on the imaging element 25. A prism 34 is disposed on the cover glass 33, and an emission surface 34b of the prism 34 faces the imaging element 25.

The cover glass 33 protects a light receiving surface (not shown) of the imaging element 25. The prism 34 guides the light having passed through the imaging lens 23 to the light receiving surface of the imaging element 25.

The imaging element 25 is provided on a surface 26a of one end portion of the circuit board 26, for example, in parallel with the optical axis C of the imaging lens 23, and is disposed below the base portion 24b of the holding member 24. On the back surface 26b of the circuit board 26 on the side opposite to the light-receiving surface of the imaging element 25, a plurality of connection terminals (not shown) for inputting and outputting signals and electric power to and from the imaging element 25 and the electronic component 36 are provided.

The circuit board 26 is formed of a flexible substrate, for example, a flexible wiring substrate. As shown in fig. 2 to 4, the circuit board 26 is bent at 2 positions to have a 1 st bent portion 26c and a 2 nd bent portion 26 d. Between the 1 st bent portion 26c and the 2 nd bent portion 26d, for example, 2 electronic components 36 are provided on the surface 26a of the circuit board 26. On the surface 26a of the circuit board 26 connected to the 2 nd bent portion 26d, for example, 3 electronic parts 36 are provided. The electronic component 36 will be described later.

By bending the circuit board 26 at 2 to provide the 1 st bent portion 26c and the 2 nd bent portion 26d, the size can be reduced in the X direction, and the endoscopic imaging device 20 can be downsized in the X direction. That is, the endoscopic imaging device 20 can be shortened. As shown in fig. 4, the signal line 29 of the signal cable 28 is electrically connected to a connection terminal (not shown) provided on the back surface 26b of the other end of the circuit board 26.

The bending of the circuit board 26 is not limited to the bending at 2, and may be appropriately determined according to the device configuration such as the number of electronic components 36, the size of the device, and the like.

The imaging element 25 receives the light having passed through the imaging lens 23 and performs photoelectric conversion. The imaging element 25 photoelectrically converts an optical image of an observation target to obtain a photographing signal.

In the endoscope imaging apparatus 20, at least 1 glass member is arranged between the lens barrel 22 and the imaging device 25, and the at least 1 glass member is, for example, the cover glass 33 and the prism 34, but the at least 1 glass member is not particularly limited to the cover glass 33 and the prism 34.

The engaging portion 32 has at least 1 convex portion provided on the holding member 24 and a concave portion provided on the coupling member 30 to engage with the convex portion of the holding member 24. In the engaging portion 32, the protruding portion of the holding member 24 is engaged with the recessed portion of the coupling member 30, whereby the holding member 24 and the coupling member 30 can be firmly fixed. The recess of the connecting member 30 further includes an opening through which a member to be described later passes.

In the base portion 24b of the holding member 24 shown in fig. 2 and 3, 2 convex portions are provided so as to face each other with the prism 34 interposed therebetween. The 2

convex portions

24c and 24d cover a part of the side surface 34c of the prism 34, and the prism 34 is fixed by sandwiching the prism 34 between the 2

convex portions

24c and 24 d. The side surface 34c of the prism 34 is a surface perpendicular to the incident surface 34a and the exit surface 34 b.

In the holding member 24, the convex portion 24c (refer to fig. 2) of the base portion 24b is, for example, a quadrangle. The convex portion 24d (see fig. 3) of the base portion 24b is, for example, a pentagon. In the 2 projections, the orientation of the holding member can be easily grasped at the time of assembly by forming the projections in different shapes. Further, by pressing the prism against the larger convex portion, the prism can be easily positioned and can be easily assembled.

The coupling member 30 holds the signal cable 28 with respect to the holding member 24.

Here, fig. 5 is a schematic perspective view showing a coupling member of example 1 of an endoscopic imaging device of an endoscope according to an embodiment of the present invention.

As shown in fig. 5, the coupling member 30 includes a holding portion 40a, and the holding portion 40a includes an arc formed by bending 1 plate member and a flat plate-like base member portion 40f continuous to the arc. The connecting member 30 has a base end 41a on the side of the holding portion 40 a. When the base member 40f is caulked so as to press the signal cable 28, the base member 40f is bent along the outer skin of the signal cable 28.

The arm portions 40b are provided on the holding portion 40a, respectively, with the plate-shaped base material portions 40f facing each other across the opening. The connecting member 30 has 1 pair of arm portions 40 b. The arm portion 40b is bent outward from the holding portion 40a in the base end 41a side and then linearly extends. Therefore, the distance between the 1 pair of arm portions 40b on the side closer to the distal end 41b than the proximal end 41a is wide, and the distance is appropriately determined according to the convex portion of the holding member 24. Further, the arm portions 40b are provided with

openings

40c and 40d at the distal ends 41 b.

The opening 40c of the arm 40b engages with the projection 24c of the holding member 24. The opening 40d of the arm 40b engages with the projection 24d of the holding member 24. The opening 40c has the same size and shape as the outer shape of the projection 24 c. The opening 40d has the same size and shape as the outer shape of the projection 24 d.

Here, the same size and shape of the opening 40c as compared with the outer shape of the projection 24c and the same size and shape of the opening 40d as compared with the outer shape of the projection 24d are included in the error range generally allowed in the art. Therefore, the opening 40c and the projection 24c may be in any one of a so-called clearance fit, a transition fit, and an interference fit. The opening 40d and the projection 24d may be in any of a clearance fit, a transition fit, and an interference fit.

In the following description, "the same size and shape" means that the error range which is generally allowable in the technical field is included as described above.

As described above, by having the engaging portion 32 for engaging the opening portions 40C and 40d of the 1 pair of arm portions 40b with the protruding portions 24C and 24d of the holding member 24, the recessed portions are fitted into the protruding portions, so that the length of the endoscopic imaging device 20 in the Y direction orthogonal to the optical axis C can be shortened, and the increase in size of the endoscopic imaging device 20 can be suppressed. Further, the holding member 24 and the coupling member 30 can be firmly fixed.

Further, by aligning the thickness of the arm portion 40b with the height of the protruding portions 24C, 24d, when the opening portions 40C, 40d of the 1 pair of arm portions 40b are engaged with the protruding portions 24C, 24d of the holding member 24, respectively, the length of the endoscopic imaging device 20 in the Y direction orthogonal to the optical axis C can be shortened, and with this configuration, the endoscopic imaging device 20 can be further downsized.

In the connecting member 30, it is preferable that 1 pair of arm portions 40b are bent so that the distal ends 41b are closer to each other than the base ends 41a of the arm portions 40 b. That is, preferably 1 pair of arm portions 40b are bent in the closing direction. Thus, by widening the primary arm portion 40b, the

openings

40c and 40d of the arm portion 40b can be fitted into the

protrusions

24c and 24d of the holding member 24, and the assembly can be easily performed.

As described above, it is preferable that 1 pair of arm portions 40b are bent so that the distal ends 41b are closer to each other than the base ends 41a of the arm portions 40b, but this may be a component state before assembly.

The arm portion 40b is provided with the

openings

40c and 40d that penetrate therethrough, but is not limited thereto, and may be a recess having a bottom that is recessed without penetrating therethrough.

The connecting member 30 is held by attaching the signal cable 28 to the inner side 40e of the holding portion 40 a. The method of attaching the signal cable 28 is not particularly limited as long as the signal cable 28 does not come off the holding portion 40a or the signal line 29 does not come off when the endoscope is used, and for example, the signal cable 28 can be attached using an adhesive.

In the holding member 24, the 2

convex portions

24c and 24d may be different in size and shape as described above, or may be the same in size and shape.

In the holding member 24, the shape of the convex portion is not particularly limited to the above-described quadrangle and pentagon, and may be a circle, an ellipse, a triangle, a polygon such as a hexagon, or a combination of these shapes. Further, the pattern may be not only 1 piece, but also a plurality of projections having the same shape may be arranged, or a specific pattern may be used.

In the engaging portion 32, 1 convex portion and 1 concave portion are engaged at 1 position, but the engaged position is not limited to 1, and a configuration in which a plurality of engaging positions are provided at 1 convex portion may be employed.

The size of the convex portion of the holding member is preferably, for example, a size that covers at least a part of the side surface 34c of the prism 34. By setting the size of the convex portion to a size that covers at least a part of the side surface 34c of the prism 34, the prism 34 can be held and fixed more stably, and can be used for positioning the prism in the Y direction with respect to the holding member at the time of assembly.

The upper limit of the size of the convex portion of the holding member can be set to a size that completely covers the side surface 34c of the prism 34.

In the holding member 24, the convex portion 24c and the convex portion 24d are provided so as to face each other, whereby the prism 34 and the circuit board 26 are surrounded by the arm portion 40 b. This stabilizes the engagement between the holding member 24 and the coupling member 30, and also protects the prism 34 and the circuit board 26.

The holding member 24 has a structure in which 2

convex portions

24c and 24d are provided, but the size is not limited thereto and 3 or more convex portions may be provided as long as the size is not increased. That is, the number of the engaging portions may be 3 or more.

The prism 34 is a member for guiding the light of the imaging lens 23 to the imaging element 25, and is not limited to a right-angle prism, and the shape of the prism 34 may be appropriately a shape corresponding to the arrangement position of the imaging element 25. In addition, the prism 34 is not necessary according to the arrangement position of the imaging element 25.

As the imaging element 25, a CCD (Charge Coupled Device) type image sensor or a CMOS (Complementary Metal Oxide Semiconductor) image sensor can be used. For example, by using the prism 34 that bends the optical axis C of the imaging lens 23 at a right angle, the degree of freedom in the arrangement position of the imaging element 25 can be increased, and a large imaging element 25 can be used without being limited by the size of the base portion 24b of the holding member 24 or the like.

After the holding member and the prism are bonded and fixed, they are sandwiched by arm portions from the side surfaces, and the arm portions are bonded to the holding member and the prism. The joining of the holding member and the prism is also made stronger by bonding the arm portions from the side. Further, by bonding the arm portion to the side surface of the prism as well as the side surface of the holding member, the fixing strength of the arm portion is also improved.

The strength of connection between the holding member and the arm portion is increased by the protruding portion and the opening (recessed portion) having the same shape and the same size, and by the cross section of the arm portion receiving the forces in the X direction and the Z direction. On the other hand, if the claw portion is used for fixation as in patent documents 1 and 2, the claw portion is opened and detached when the distal end portion of the insertion portion of the endoscope is bent and a force in the X direction is applied.

< Circuit Board >

Next, the circuit board 26 will be explained.

Fig. 6 is a schematic diagram showing an example of a circuit board of example 1 of the endoscopic imaging apparatus according to the embodiment of the present invention. Fig. 6 shows the circuit board 26 before being bent.

As shown in fig. 6, for example, the circuit board 26 has the imaging element 25 and the electronic component 36 arranged at predetermined positions on the surface 26 a. For example, the rear surface 26b of the circuit board 26 is joined to a shield conductor (not shown) of the signal cable 28 by, for example, soldering. The signal line 29 of the signal cable 28 is electrically connected to a connection terminal (not shown) provided on the rear surface 26 b.

By joining the shield conductor of the signal cable 28 to the back surface 26b, heat generated from the imaging element 25 and the electronic component 36 can be discharged from the circuit board 26 via the signal cable 28, and the heat dissipation of the endoscopic imaging device 20 can be improved.

In fig. 6, on the surface 26a of the circuit board 26, for example, the

imaging element

25 and 2 electronic components 36 are disposed with the 1 st bending region 27a interposed therebetween, and 2 electronic components 36 and 3 electronic components 36 on the signal cable 28 side are disposed with the 2 nd bending region 27b interposed therebetween. The 1 st bending region 27a corresponds to the 1 st bending portion 26c, and the 2 nd bending region 27b corresponds to the 2 nd bending portion 26 d.

In the circuit board 26, the 1 st bending region 27a is bent in such a manner that the imaging element 25 is opposed to the electronic part 36, and the 2 nd bending region 27b is bent in such a manner as to be opposed to the back surface 26b of the circuit board 26. Thus, the circuit board 26 has a structure having the 1 st bent portion 26c and the 2 nd bent portion 26d as shown in fig. 2 to 4.

The electronic component 36 is used for driving the imaging element 25, and is not particularly limited, and examples thereof include a regulator, a resistor, a capacitor, and the like.

[ 2 nd example of endoscopic imaging device ]

The endoscopic imaging device 20 is not limited to the configuration shown in fig. 2 to 4. Hereinafter, example 2 of the endoscope image pickup apparatus will be described.

Fig. 7 is a schematic perspective view showing a 2 nd example of an endoscopic imaging device of an endoscope according to an embodiment of the present invention, and fig. 8 is a schematic side view showing the 2 nd example of the endoscopic imaging device of the endoscope according to the embodiment of the present invention.

In fig. 7 and 8, the same components as those of the endoscopic imaging apparatus 20 shown in fig. 2 to 4 and the coupling member 30 shown in fig. 5 are given the same reference numerals, and detailed description thereof is omitted.

The endoscopic imaging apparatus 21 shown in fig. 7 and 8 differs from the endoscopic imaging apparatus 20 shown in fig. 2 to 4 in the structure of the circuit board 50, the arrangement of the imaging element 25 and the cover glass 33, and the absence of the prism 34. The other structure is the same as the endoscopic imaging apparatus 20 shown in fig. 2 to 4.

In the endoscopic imaging apparatus 21 shown in fig. 7 and 8, the circuit board 50 is configured such that a support portion 50b is provided perpendicularly to a flat plate-shaped base portion 50 a. The imaging element 25 is provided on the support surface 50d of the support portion 50 b. A cover glass 33 is provided on the imaging element 25, and a light receiving surface (not shown) is covered with the cover glass 33.

A cover glass 33 is disposed on the back surface 24e of the base portion 24b of the holding member 24, and the imaging element 25 is disposed with the light-receiving surface (not shown) facing the imaging lens 23.

A plurality of connection terminals (not shown) for inputting and outputting signals and power to and from the imaging element 25 and the electronic component 36 are provided on the surface 50c of the circuit board 50. The connection terminals of the surface 50c of the circuit board 50 are electrically connected to the signal lines 29 of the signal cable 28.

The structure of the circuit board 50 is not particularly limited, and may be a flexible wiring board or a rigid board. As the rigid substrate, a printed wiring board can be used.

The same effects as those of the endoscopic imaging apparatus 20 can be obtained also in the endoscopic imaging apparatus 21 shown in fig. 7 and 8. In the endoscopic imaging apparatus 21, since the engaging portion 32 is provided to engage the opening portions 40C and 40d of the 1 pair of arm portions 40b with the protruding portions 24C and 24d of the holding member 24, and the protruding portions are fitted to the recessed portions, the length of the endoscopic imaging apparatus 20 in the Y direction orthogonal to the optical axis C can be shortened, and the size increase of the endoscopic imaging apparatus 20 can be suppressed. Further, the holding member 24 and the coupling member 30 can be firmly fixed.

The present invention is basically constituted as described above. Although the endoscope imaging apparatus and the 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 can be made without departing from the scope of the present invention.

Claims

1. An endoscopic imaging apparatus comprising:

a lens barrel having an imaging lens provided therein;

an imaging element that receives light having passed through the imaging lens and performs photoelectric conversion;

at least 1 glass member disposed between the lens barrel and the imaging element;

a holding member that connects the glass member and the lens barrel;

a signal cable electrically connected to the imaging element;

a coupling member that holds the signal cable with respect to the holding member; and

an engaging portion for engaging the holding member with the coupling member,

the engaging portion has at least 1 convex portion provided on the holding member and a concave portion provided on the coupling member and engaged with the convex portion of the holding member.

2. The endoscopic camera apparatus according to claim 1,

the convex parts of the holding member are arranged in 2 numbers facing each other and sandwiching the glass member,

the connecting member has 1 pair of arm portions opposed to each other, the recessed portion is provided at a tip end of each of the arm portions,

the concave portion of the tip of the arm portion of the coupling member is engaged with the convex portion of the holding member.

3. The endoscopic camera apparatus according to claim 1,

the convex portion of the holding member covers at least a part of a side surface of the glass member.

4. The endoscopic camera apparatus according to claim 2,

5. The endoscopic camera apparatus according to claim 2,

the at least 1 glass member has a prism having an incident surface orthogonal to an exit surface, the prism being arranged such that the incident surface opposes the imaging lens and the exit surface opposes the imaging element,

the convex portions of the holding member are arranged so as to face each other with side surfaces orthogonal to the incident surface and the emission surface of the prism interposed therebetween.

6. The endoscopic camera apparatus according to claim 3,

7. The endoscopic camera apparatus according to claim 2,

the 1 pair of arm portions are curved so that the leading ends thereof are closer to each other than the base ends thereof.

8. The endoscopic camera apparatus according to claim 3,

9. The endoscopic camera apparatus according to claim 4,

10. The endoscopic imaging apparatus according to any one of claims 1 to 9,

the recess includes an opening portion therethrough.

11. An endoscope comprising the endoscopic imaging device according to any one of claims 1 to 10.