JP5155019B2 - Aperture-integrated spacing ring and aperture-integrated lens frame - Google Patents

Description

The present invention relates to an aperture- integrated interval ring and an aperture-integrated lens frame having an aperture configured by a thin plate.

  Conventionally, an elongated insertion part is inserted into the body, and an internal organ or the like is displayed on a monitor screen using an imaging device provided with a solid-state imaging device provided at the distal end of the insertion part, so that examination or diagnosis can be performed. Electronic endoscopes that can be used are widely used.

  In recent years, in an electronic endoscope used in the medical field, the diameter of an insertion portion has been reduced for the purpose of reducing pain given to a patient as much as possible. There is also a demand for higher image quality of the observation image displayed on the monitor screen.

For example, Patent Document 1 discloses an endoscope objective lens in which a light-shielding mask for preventing the occurrence of flare, ghost, and the like can be securely fixed in an accurate orientation with respect to the objective barrel by a simple assembly operation. The parts are shown. In this patent document 1, before arranging a spacer ring and a light shielding mask in an objective barrel, the spacer ring and the light shielding mask are bonded together with an adhesive in advance.
JP 2007-159836 A

  However, as described in Patent Document 1, when a spacer ring of about 0.2 to 1 mm and a light shielding mask of about 0.02 to 0.03 mm are bonded together with an adhesive, the light shielding mask is bonded so as not to be deformed. Bonding so that the light-shielding mask is not displaced and pasting so as not to touch the black processing portion of the light-shielding mask are difficult operations. Further, there is a possibility that flare or the like may occur due to a change in the thickness of the adhesive layer that adheres the spacer ring and the light shielding mask.

The present invention has been made in view of the above circumstances, and an object thereof is to provide an aperture integrated interval ring and an aperture integrated lens frame that are excellent in workability, obtain a desired aperture effect, and are suitable for cost reduction. ing.

An aperture integrated spacer ring according to one aspect of the present invention includes an annular diaphragm thin plate having an inner diameter portion with a thickness dimension of 0.01 mm or less, and an inner diameter of the diaphragm thin plate laminated and fixed to the diaphragm thin plate. A plurality of thin plate ring members having an inner diameter portion larger in diameter than the diameter of the portion, and the diaphragm is configured by laminating and fixing one or more of the thin plate for diaphragm, the plurality of thin plate ring members The outer ring portion is composed of two or more types of thin plate ring members having different diameters.
An aperture-integrated lens frame according to one aspect of the present invention has an annular diaphragm thin plate having an inner diameter portion with a thickness of 0.01 mm or less, and is laminated and fixed to both surfaces of the diaphragm thin plate so that one optical lens is fitted. A lens fitting portion to be fixed together, one inner diameter end where the one optical lens abuts by line contact, and another inner diameter end where the other optical lens which faces the one optical lens across the diaphragm thin plate abuts by line contact A plurality of thin plate ring members having an inner diameter portion larger than the diameter of the inner diameter portion of the diaphragm thin plate, and the lens fitting portion has an inner diameter size of the one. A thin plate ring member group in which one thin plate ring member corresponding to the outer diameter size of the optical lens and another thin plate ring member having an inner diameter size and an outer diameter size different from the one thin plate ring member are laminated for each type to have a predetermined thickness. Are stacked and fixed alternately, and a step is provided on the outer or inner surface. It was.
An aperture-integrated lens frame according to another aspect of the present invention has an annular diaphragm thin plate having a thickness dimension of 0.01 mm or less and having an inner diameter portion, and is laminated and fixed on both surfaces of the diaphragm thin plate. The lens fitting portion to be fitted and fixed, the one inner diameter end where the one optical lens abuts by line contact, and the other inner diameter where the other optical lens facing the one optical lens across the diaphragm thin plate abuts by line contact And a plurality of thin plate ring members having an inner diameter portion larger than the diameter of the inner diameter portion of the diaphragm thin plate, constituting the lens receiving portion having an end, and the lens receiving portion constitutes the inner diameter end. One thin plate ring member group configured to have a predetermined thickness by stacking one thin plate ring member, and another thin plate configured to have a predetermined thickness by stacking other thin plate ring members different in inner diameter and outer diameter from the one thin plate ring member Alternately stacking and fixing the ring member group on the outer or inner surface Part was the arranged.

  According to this configuration, since the plurality of thin plate ring members are laminated and fixed to the diaphragm thin plate, handling of the diaphragm thin plate having a desired diaphragm effect is facilitated.

According to the present invention, a diaphragm integrated interval ring and a diaphragm integrated lens frame that are excellent in workability and obtain a desired diaphragm effect can be realized at low cost.

  Embodiments of the present invention will be described below with reference to the drawings.

  1 to 7 relate to an embodiment of the present invention, FIG. 1 is a perspective view illustrating an electronic endoscope including an imaging device, and FIG. 2 illustrates a configuration of a distal end side of an insertion portion of the endoscope. FIG. 3 is a cross-sectional view for explaining the configuration of an image pickup apparatus including an objective optical unit and an image pickup unit, FIG. 4 is a view for explaining an arrangement example of electronic components mounted on a circuit board, and FIG. FIG. 6 is a diagram for explaining a configuration of a body type interval ring, FIG. 6 is a diagram for explaining a diaphragm for a diaphragm, and FIG. 7 is a diagram for explaining another configuration of a diaphragm integrated interval ring.

  As shown in FIG. 1, an electronic endoscope (hereinafter abbreviated as “endoscope”) 1 includes an insertion portion 2 inserted into the body, an operation portion 3 provided on the proximal end side of the insertion portion 2, and an operation. And a universal cord 4 extending from the portion 3. An endoscope connector (not shown) is provided at the proximal end portion of the universal cord 4.

  The insertion portion 2 is configured by connecting, in order from the distal end side, a hard distal end portion 2a, a bendable bending portion 2b, and a long flexible tube portion 2c having flexibility. The bending portion 2b is configured to bend in the up-down direction and the left-right direction, for example.

  The operation unit 3 also serves as a gripping unit. The operation unit 3 includes an up / down bending knob 3a for bending the bending portion 2b in the up / down direction, a left / right bending knob 3b for bending in the left / right direction, an air / water supply button 3c, and a suction button 3d. , And a plurality of remote buttons 3e for instructing drive control and the like of an imaging device described later built in the distal end portion 2a.

  Further, the operation section 3 is provided with a treatment instrument insertion port 3f that constitutes a proximal end portion of a treatment instrument channel (see reference numeral 12 in FIG. 2) described later. A treatment tool (not shown) such as a grasping forceps is introduced from the treatment tool insertion port 3f, and is guided into the body through the treatment tool channel 12 and an opening (reference numeral 18b in FIG. 2) provided in the distal end portion 2a.

  The endoscope connector is connected to, for example, a camera control unit. The camera control unit is provided with an image processing circuit that generates an image signal that is photoelectrically converted by a solid-state imaging device (hereinafter, abbreviated as an imaging device), which will be described later, provided in the imaging device, and generates a video signal. The video signal generated by the image processing circuit of the camera control unit is output to a display device (not shown), and an endoscopic image as an observation image is displayed on the screen of the display device.

  As shown in FIG. 2, the bending portion 2 b constituting the insertion portion 2 of the endoscope 1 is configured by continuously connecting a plurality of bending pieces 5. The outer periphery of each of the plurality of bending pieces 5 is covered with a bending blade 6 formed into a tubular shape by braiding a thin wire or the like, and the outer periphery of the bending blade 6 is covered with a bending rubber 7 for ensuring watertightness. . The outer peripheral portion of the distal end of the curved rubber 7 is integrally fixed to the distal end hard portion 11 constituting the distal end portion 2a of the insertion portion 2 by providing, for example, a bobbin adhering portion 8.

  On the other hand, on the inner peripheral surface of the bending piece 5, for example, four wire guards 5a are integrally fixed around the insertion portion axis, for example, by welding, joining, or the like at intervals of about 90 °. In this case, four bending wires 9 are inserted into the insertion portion 2.

  The distal end portion of each bending wire 9 is fixed to a plurality of stationary rings 10 provided in the distal end portion 2a. In the present embodiment, like the wire guard 5a, the fixed ring 10 is joined to the inner peripheral surface of the distal bending piece 5f, which is the first bending piece, at approximately 90 ° intervals around the insertion axis.

  Each bending wire 9 is inserted through the wire guard 5 a fixed to the bending piece 5 and extended into the operation unit 3. And the base end part of each bending wire 9 is each fixed to the bending operation mechanism part which is not shown in figure connected with bending knob 3a, 3b.

  The distal end portion 2 a is mainly composed of the distal end hard portion 11 and the distal end cover portion 18. The distal end hard portion 11 is formed in a cylindrical shape with a hard metal member such as stainless steel. A distal end cover portion 18 is fixed to the distal end side surface of the distal end rigid portion 11, and a distal end bending piece 5f is fixed to the outer periphery of the proximal end portion.

  A plurality of through holes 11 a, 11 b, 11 c,... Having a center line parallel to the central axis of the distal end hard portion 11 are formed in the distal end hard portion 11. The first through-hole 11a is, for example, a through-hole constituting the treatment instrument channel 12, and a channel base 13 is fixed thereto. A distal end portion of a flexible channel tube 14 constituting the treatment instrument channel 12 is fixed to the proximal end portion of the channel cap 13.

  The second through-hole 11b is, for example, a through-hole constituting the front water supply channel 15, and a front water supply base 16 is fixedly provided. A distal end portion of a flexible front water supply tube 17 constituting the front water supply channel 15 is fixed to a proximal end portion of the front water supply base 16.

  The 3rd through-hole 11c is a through-hole for arrange | positioning the imaging device 20 which comprises an observation optical system. The imaging device 20 includes an imaging device optical unit (hereinafter abbreviated as an imaging optical unit) 30 and an imaging device element unit (hereinafter abbreviated as an imaging element unit) 40, and includes a third through hole 11c. The imaging optical unit 30 is fixedly installed. Reference numeral 44 denotes a signal cable extending from the image sensor unit 40 constituting the image pickup apparatus 20.

  In addition to the through holes 11a, 11b, and 11c, the distal end rigid portion 11 is a through hole constituting an air / water supply channel hole for supplying liquid or gas to an air / water supply nozzle (not shown), or an illumination optical system. A through-hole or the like for arranging a certain lighting unit is formed.

  The tip cover portion 18 provided on the tip end side of the tip hard portion 11 has a cylindrical shape, and a plurality of communication holes 18b communicating with the through holes 11a, 11b, 11c,. , 18c, 18d, ... are formed. The first communication hole 18 b constitutes the distal end opening of the treatment instrument channel 12. The second communication hole 18 c constitutes the tip opening of the front water supply channel 15. The distal end portion of the imaging optical unit 30 is disposed in the third communication hole 18d.

  As shown in FIG. 3, the imaging apparatus 20 includes an imaging optical unit 30 and an imaging element unit 40. The imaging optical unit 30 includes, for example, an optical member such as a plurality of optical lenses 31, a plurality of diaphragms 32, and a diaphragm integrated spacing ring 32A that is an optical unit, and these optical lenses 31, a diaphragm 32, and a diaphragm integrated spacing ring 32A. The lens frame 33 is fixedly provided.

  On the other hand, the imaging element unit 40 includes an imaging element 41, an element frame 42, a circuit board 43, a signal cable 44, and an imaging device exterior frame (hereinafter referred to as an imaging frame) 45. .

  The image sensor 41 is a CCD (Charge Coupled Device), a CMOS (Complementary Metal-Oxide Semiconductor), or the like. On the light receiving surface side of the image sensor 41, for example, two cover lenses 47a and 47b, which are optical members, are bonded and fixed. The second cover lens 47 b is disposed on the light receiving surface of the image sensor 41.

  The element frame 42 is made of, for example, stainless steel, and of the two cover lenses 47 a and 47 b disposed on the light receiving surface side of the image sensor 41, the first cover lens 47 a is the inner surface of the base end portion of the element frame 42. Are integrally fixed to each other by bonding. That is, the image sensor 41 is fixed to the element frame 42 via the cover lenses 47a and 47b. The base end of the lens frame 33 is disposed on the inner surface of the distal end portion of the element frame 42, and after the position adjustment of the focus or the like is completed, the lens frame 33 and the element frame 42 are integrally joined by solder 51, for example.

  The circuit board 43 is a flexible printed board having flexibility, for example. Various electronic components 52, 53, 54,... Are mounted on the circuit board 43. The front end side of the circuit board 43 on which these electronic components 52, 53, and 54 are mounted is electrically connected to the image sensor 41.

  When the height h1 of the first electronic component 52, the height h2 of the second electronic component 53, and the height h3 of the third electronic component 54 have a relationship of h1> h2> h3, at least the height dimension is The lowest third electronic component 54 is mounted at a position farthest from the image sensor 41. This makes it possible to arrange the bending angle of the flexible printed circuit board with a larger θ.

  As shown in FIG. 4, a terminal 56 a connected to the image sensor 41 and a plurality of lands 56 b, 56 c, 56 d on which electronic components 52, 53, 54 are mounted are provided on the circuit board 43.

  In the present embodiment, the lands 56d are arranged in the longitudinal direction at positions away from the image sensor 41. Thus, the electronic component 54 shown by the broken line is mounted so as to be orthogonal to the electronic component 53 shown by the two-dot chain line mounted in the width direction. Even if the force in the torsional direction is exerted by holding both ends of the circuit board 43 at the position where the electronic component 54 is mounted during the assembly operation, the joint between the electronic component 54 and the land 56d is broken. The occurrence of defects can be prevented and the torsional strength can be improved. In addition, in this figure, illustration of the pattern etc. which connect the terminal 56a and land 56b, 56c, 56d is abbreviate | omitted.

  A plurality of signal lines 44a, 44b, 44c,... Are inserted into the signal cable 44. The tip portions of the plurality of signal lines 44 a, 44 b, 44 c,... Are connected to electrical connection portions (not shown) provided on the circuit board 43. A base end portion of the signal cable 44 is inserted through the insertion portion 2, the operation portion 3, and the universal cord 4 and extends into the endoscope connector. Reference numeral 55 denotes a cable protection member that protects the signal lines 44a, 44b, 44c,.

  The imaging frame 45 is a member that constitutes the exterior of the imaging element unit 40, and includes a circuit board 43 on which the imaging element 41, the electronic components 52, 53, and 54 are mounted, and a part of the signal cable 44 connected to the circuit board 43. Etc. The imaging frame 45 is formed in a predetermined shape, for example, by rounding or bending one rectangular thin plate made of stainless steel.

A thin heat shrink tube 57 is disposed on the outer surface of the imaging frame 45. The proximal end portion of the heat shrinkable tube 57 is disposed on the outer surface of the distal end portion of the cable protection member 55.
Reference numerals 58a, 58b, and 58c are insulating sealing resins. The first sealing resin 58a is provided so as to cover the periphery of the electrical connection portion between the circuit board 43 and the imaging element 41. The second sealing resin 58 b is provided so as to cover the periphery of the electronic components 52, 53, and 54 mounted on the circuit board 43 and the periphery of the cover lens 47 b and the image sensor 41. The third sealing resin 58c is around the connecting portion between the signal lines 44a, 44b, 44c,... And the circuit board 43, and in a space mainly composed of the imaging frame 45, the element frame 42, and the second sealing resin 58b. Filled.

  As shown in FIG. 5, the diaphragm integrated spacing ring 32 </ b> A includes a diaphragm thin plate 34 and a plurality of thin plate ring members 35. The diaphragm thin plate 34 shown in FIGS. 5 and 6 is, for example, an annular metal thin plate having a thickness dimension of 0.01 mm and a diaphragm inner diameter portion 34a, and is formed by etching.

  On the other hand, the plurality of thin plate ring members 35 shown in FIG. 5 are also annular metal thin plates having a thickness dimension of 0.01 mm, for example, and have an inner diameter portion larger than the inner diameter dimension of the diaphragm inner diameter portion 34a of the diaphragm thin plate 34. 35a. The thin plate ring member 35 having the inner diameter portion 35a is also formed by etching.

  The plurality of thin plate ring members 35 are laminated and fixed to both surfaces of the diaphragm thin plate 34. The outer diameter dimension of the plurality of thin plate ring members 35 and the outer diameter dimension of the diaphragm thin plate 34 are set to the same dimension. The diaphragm integrated spacing ring 32A has a plurality of thin plate ring members 35 and diaphragm thin plates 34 formed by etching, arranged in a predetermined number, and laminated and fixed integrally by pressure bonding, for example, 0.3 mm. Etc., and a predetermined thickness dimension. The diaphragm integrated spacing ring 32A is subjected to predetermined black processing.

  As shown in FIG. 6, a notch 34 b for notifying that the diaphragm thin plate 34 is formed is formed on the outer periphery of the diaphragm thin plate 34. Therefore, the operator can confirm that the part is the diaphragm integrated type spacing ring 32A by confirming the notch 34b, and can confirm the arrangement position of the diaphragm thin plate 34.

  Further, the notch 34b also serves as notification means for notifying the operator of the diameter of the aperture inner diameter portion 34a of the aperture thin plate 34, for example. That is, by providing the number of the notches 34b as two, three,... As shown by the broken line, for example, it becomes possible to notify the difference in the diameter of the aperture inner diameter portion 34a.

  Thus, by constructing a diaphragm integrated interval ring by laminating and fixing a plurality of thin plate ring members on both surfaces of the diaphragm thin plate, for example, when configuring an optical unit for an imaging device of an endoscope, By assembling one aperture-integrated interval ring set to a predetermined size without separately assembling the interval ring and the diaphragm between the optical lenses, the interval ring and the aperture can be assembled. Can be completed. That is, it is possible to reduce the number of parts and the number of assembly steps.

  In addition, according to the integrated aperture ring with the above-described structure, the assembly work can be performed without directly touching the diaphragm thin plate, which is a metal thin plate, so that the malfunction of the diaphragm thin plate and the problem of peeling off the black processing portion are ensured. Can be prevented.

Further, according to the diaphragm integrated type interval ring having the above configuration, it is possible to reliably prevent dust from adhering between the interval ring and the diaphragm during the assembling work. In addition, it is possible to easily provide a diaphragm integrated type spacing ring in which the diaphragm and the spacing ring are integrated compared to machining.
By these things, the cost reduction of the optical unit for imaging devices can be aimed at.

  Further, according to the diaphragm integrated type interval ring having the above configuration, the sagging formed on the inner diameter portion of the diaphragm thin plate and the opening ridge line of the inner diameter portion of the thin plate ring member is smaller than the thickness dimension of the thin plate. When the thickness dimension is, for example, 0.01 mm, the occurrence of flare due to sagging can be prevented.

As shown in FIG. 7, for example, a plurality of types of thin plate ring members 36a, 36b, 36c, 36d, and 36e having different diameters of the inner diameter portions 36a1, 36b1, 36c1, 36d1, and 36e1 are appropriately attached to both surfaces of the diaphragm thin plate 34. The aperture integrated ring 32B may be configured by being laminated and fixed to the diaphragm.

  According to this configuration, the shape of the first internal space 36A configured by the inner diameter portions 36e1, 36c1, and 36c1 and the shape of the second inner space 36B configured by the inner diameter portions 36e1, 36d1, 36d1, 36b1, and 36a1 are formed. Since they are different, the shape of the internal spaces 36A and 36B can be visually confirmed during assembly work, and the arrangement direction of the aperture integrated spacer ring 32B in the optical axis direction can be easily grasped. In the figure, reference numeral OA denotes an optical axis.

  Further, in the above-described embodiment, a plurality of thin plate ring members are stacked and fixed on both surfaces of the diaphragm thin plate to form a diaphragm integrated interval ring. However, a plurality of thin plate ring members may be laminated and fixed only on one surface side of the diaphragm thin plate to constitute a diaphragm integrated type interval ring.

  Furthermore, in the above-described embodiment, the thickness dimension of the diaphragm for thinning and the thickness dimension of the thin-plate ring member are set to 0.01 mm, but the thickness dimension may be larger or smaller than that. Good.

  In the case where the thickness dimension of the drawing thin plate is set to 0.01 mm or more, in order to prevent the occurrence of flare due to sagging, the drawing thin plate of 0.01 mm or less is laminated and fixed. As a result, even when the thickness of the diaphragm thin plate is 0.1 mm, flare due to sagging can be prevented. According to this configuration, the work of providing a notification unit for notifying the front and back of the diaphragm and the work of determining the front and back of the diaphragm become unnecessary.

  In the above-described embodiment, a plurality of thin plate ring members are laminated and fixed to the diaphragm thin plate to form a diaphragm integrated interval ring. However, instead of stacking and fixing a plurality of thin plate ring members to the diaphragm thin plate to form the diaphragm integral type interval ring, the diaphragm integral type lens frame 37 shown in FIG. 8 may be constructed. FIG. 8 is a diagram for explaining the configuration of the aperture-integrated lens frame.

  8 includes a lens fitting portion 37a and a lens receiving portion 37b. The lens fitting portion 37a and the lens receiving portion 37b have a plurality of thin plate ring members on both surfaces of the diaphragm thin plate. 38a, 38b, 38c, 38d, 38e, 38f... Are stacked and fixed.

  In the present embodiment, the lens fitting portion 37a is configured by, for example, thin plate ring members 38a, 38b, and the lens receiving portion 37b is configured by, for example, thin plate ring members 38c, 38d, 38e, 38f. The optical lens 31 is fitted and fixed to the lens fitting portion 37a.

  The first thin plate ring member 38a and the second thin plate ring member 38b constituting the lens fitting portion 37a have different diameter dimensions of the inner diameter portion and the outer diameter portion. In the present embodiment, the diameter dimension of the inner diameter portion 38ia of the first thin plate ring member 38a is smaller than the diameter size of the inner diameter portion 38ib of the second thin plate ring member 38b, and the outer diameter portion 38oa of the first thin plate ring member 38a. The diameter is larger than the diameter of the outer diameter portion 38ob of the second thin plate ring member 38b.

The lens fitting portion 37a includes a first thin plate ring member group 38as configured by stacking a plurality of first thin plate ring members 38a and a second structure configured by stacking a plurality of second thin plate ring members 38b. The thin plate ring member groups 38bs are alternately stacked and fixed. For this reason, a plurality of outer stepped portions 39o and a plurality of inner stepped portions 39i are formed on the outer and inner surfaces of the lens fitting portion 37a. The inner stepped portion 39i functions as an adhesive pool. Further, the outer stepped portion 39o functions as an adhesive pool and a heat radiation fin.

  In the present embodiment, the diameter dimension of the inner diameter portion 38ia of the first thin plate ring member 38a corresponds to the outer diameter dimension of the optical lens 31, and the optical lens 31 is bonded to the lens fitting portion 37a as shown in the figure. The fitting is fixed.

  That is, by providing the inner stepped portion 39i in the lens fitting portion 37a, when the optical lens 31 is bonded and fixed, the adhesive 58d can be reliably applied to the fitting surface, while the adhesive 58d is It can prevent flowing into the surface of the lens curved surface portion.

Further, since the lens fitting portion 37a has the outer stepped portion 39o, the adhesive 58d can be reliably applied to the fitting surface when the diaphragm integrated lens frame 37 is bonded and fixed to the lens frame 33. In addition, heat generated in the vicinity of the aperture-integrated lens frame 37 is transmitted to the aperture-integrated lens frame 37, so that the transmitted heat is radiated from the outer stepped portion 39o that also serves as a heat dissipation fin.

  Of the thin plate ring members 38c, 38d, 38e, and 38f constituting the lens receiving portion 37b of the present embodiment, the diameter dimension of the outer diameter portion 38oc of the third thin plate ring member 38c disposed on one surface side of the diaphragm thin plate 34 The diameter dimension of the outer diameter portion 38oe of the fifth thin plate ring member 38e disposed on the other surface side of the diaphragm thin plate 34 is the same, and the diameter dimensions of the inner diameter portions 38ic and 38ie are different. Further, the diameter of the outer diameter portion 38od of the fourth thin plate ring member 38d disposed on the one surface side of the diaphragm thin plate 34, and the outer diameter of the sixth thin plate ring member 38f disposed on the other surface side of the diaphragm thin plate 34. The diameter of the portion 38of is the same, and the diameters of the inner diameter portions 38id and 38if are different. In addition, the diameter of the outer diameter part 38oc is set larger than the diameter of the outer diameter part 38od, and the diameter of the inner diameter part 38ic is set smaller than the diameter dimension of the inner diameter part 38id. On the other hand, the diameter dimension of the outer diameter part 38oe is larger than the diameter dimension of the outer diameter part 38of, and the diameter dimension of the inner diameter part 38ie is set smaller than the diameter dimension of the inner diameter part 38if.

Then, a third thin plate ring member group 38cs configured to have a predetermined thickness by stacking a plurality of third thin plate ring members 38c and a fourth thin plate configured to have a predetermined thickness by stacking a plurality of fourth thin plate ring members 38d. A plurality of fifth thin plate ring member groups 38es which are arranged in a predetermined thickness by laminating and fixing a plurality of fifth thin plate ring members 38e, which are alternately arranged and stacked and fixed on one surface side of the diaphragm plate 34, The sixth thin plate ring members 38f are laminated to form a predetermined thickness, and the sixth thin plate ring member groups 38fs are alternately arranged and stacked and fixed on the other surface side of the diaphragm plate 34. Therefore, an outer stepped portion 39o is formed on the outer surface of the lens fitting portion 37a, and an inner stepped portion 39i is formed on the inner surface.

In the lens receiving portion 37b configured as described above, one optical lens 31 is held in contact with the inner diameter end 38zc of the third thin plate ring member group 38cs located on one end side by line contact, and the other end. Another optical lens 31 is held in contact with the inner diameter end 38zf of the sixth thin plate ring member group 38fs located on the side by linear contact. Since the third thin plate ring member 38c and the sixth thin plate ring member 38f are very thin, variation in the edge dimension of the lens contact portion is small, and as a result, variation between lens surfaces can be suppressed.

  Thus, by forming a diaphragm integrated lens frame by laminating and fixing a plurality of thin plate ring member groups on both sides of the diaphragm thin plate, the number of parts can be reduced and the number of assembly steps can be reduced.

In addition, by laminating and fixing a plurality of thin plate ring member groups having different diameters of the outer diameter part or inner diameter part, and appropriately providing a step part on the outer surface or the inner surface, the step part is accumulated and adhered. It can be used for fins or the like to increase the degree of freedom in designing the lens frame.
Other operations and effects are the same as those of the diaphragm integrated type interval ring described above.

  The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the invention.

1 to 7 relate to an embodiment of the present invention, and FIG. 1 is a perspective view illustrating an electronic endoscope provided with an imaging device. Sectional drawing for demonstrating the structure by the side of the front-end | tip part of the insertion part of an endoscope Sectional drawing explaining the structure of an imaging device provided with an objective optical unit and an imaging unit The figure explaining the example of arrangement of the electronic component mounted on a circuit board The figure explaining the composition of a diaphragm integrated interval ring Diagram explaining diaphragm for diaphragm The figure explaining other composition of a diaphragm integrated interval ring The figure explaining the structure of a diaphragm integrated lens frame

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Endoscope 20 ... Imaging device 30 ... Imaging optical unit 31 ... Optical lens 32A ... Integrated distance ring 33 ... Lens frame 34 ... Diaphragm thin plate 34a ... Diaphragm inner diameter part 34b ... Notch part 35 ... Thin plate ring member 35a ... Inner diameter

Claims (3)

An annular diaphragm thin plate having an inner diameter portion with a thickness dimension of 0.01 mm or less;
A plurality of thin plate ring members having an inner diameter portion larger than the diameter of the inner diameter portion of the diaphragm thin plate, which is laminated and fixed to the diaphragm thin plate,
The diaphragm is constituted by laminating and fixing one or more thin sheets for the diaphragm,
The plurality of thin plate ring members are constituted by two or more types of thin plate ring members having different diameters of outer diameter portions .   An annular diaphragm thin plate having an inner diameter with a thickness dimension of 0.01 mm or less;
  A lens fitting portion on which both optical lenses are fitted and fixed on both surfaces of the diaphragm thin plate, one inner diameter end where the one optical lens abuts in line contact, and the one optical lens and the diaphragm thin plate. A plurality of thin plate ring members having an inner diameter portion larger than the diameter of the inner diameter portion of the diaphragm thin plate, constituting a lens receiving portion having another inner diameter end with which the other optical lens opposed to each other is in line contact, ,
  Comprising
  The lens fitting portion includes, for each type, one thin plate ring member whose inner diameter dimension corresponds to the outer diameter dimension of the one optical lens, and another thin plate ring member whose inner diameter dimension and outer diameter dimension are different from the one thin plate ring member. An aperture-integrated lens frame comprising a plurality of thin plate ring members that are laminated to have a predetermined thickness and are alternately laminated and fixed, and a step portion is provided on an outer surface or an inner surface side.   An annular diaphragm thin plate having an inner diameter with a thickness dimension of 0.01 mm or less;
  A lens fitting portion on which both optical lenses are fitted and fixed on both surfaces of the diaphragm thin plate, one inner diameter end where the one optical lens abuts in line contact, and the one optical lens and the diaphragm thin plate. A plurality of thin plate ring members having an inner diameter portion larger than the diameter of the inner diameter portion of the diaphragm thin plate, constituting a lens receiving portion having another inner diameter end with which the other optical lens opposed to each other is in line contact, ,
  Comprising
  The lens receiving portion includes one thin plate ring member group formed by laminating one thin plate ring member constituting the inner diameter end to a predetermined thickness, and another thin plate ring member having an inner diameter size and an outer diameter size different from the one thin plate ring member. An aperture-integrated lens frame characterized in that a step portion is provided on the outer surface or the inner surface by alternately laminating and fixing another thin plate ring member group having a predetermined thickness by laminating layers.

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