JP2013075029A - Imaging unit and camera module for endoscope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the occurrence of the separation of a prism of an imaging unit, the breakage of a transmission cable, and the separation of a junction part even if pulling force acts on the transmission cable according to the bending of a curve part.SOLUTION: A prism holder 40 includes an installation tube part 40a and a prism installation frame 40b. The prism installation frame 40b is projectingly formed with positioning pieces 40d, 40e, and a surface of the prism 41 is pressed against the positioning pieces 40d, 40e, and the prism 41 is positioned in the prism holder 40. One end of a cable connector 45 is firmly fixed to the transmission cable 44. The other end of the cable connector 45 is locked to a locking hole 47 of the positioning piece 40d through a connection piece 45b, a step part 53, and a locking claw 45d. Because a pulling force directly acts on the prism holder 40 through the cable connector 45 even if the transmission cable 44 is pulled, the pulling force does not act on the prism 41 or a circuit board 43, so that the separation of the prism 41 or the wire breakage of the junction part is eliminated.

Description

  The present invention relates to an endoscope imaging unit and a camera module.

  An endoscope has an insertion part inserted in a patient's body, for example. The insertion portion is a tip hard portion, a bending portion, and a soft portion in order from the tip. An observation window, an illumination window, a forceps outlet, and an air / water supply nozzle are provided on the distal end surface of the distal end hard portion. Further, a camera module is attached to the inner surface of the hard tip portion at a position corresponding to the observation window, and a light guide is attached at a position corresponding to the illumination window. The bending portion is configured by connecting a plurality of node ring units, and the distal end hard portion can be directed in a desired direction by a wire operation. The soft part has a length of about 1 m to 2 m in order to allow the distal end hard part to reach a desired observation site of the subject.

  The camera module includes a photographic lens unit and an imaging unit. The taking lens unit is configured by housing a plurality of lenses in a housing. The imaging unit includes an image area sensor such as a CCD that photoelectrically converts an optical image formed by the photographing lens unit into an imaging signal. The image area sensor is connected to a transmission cable via a circuit board such as a flexible board or a sub board. In addition, electronic components are mounted on the flexible substrate and the sub-substrate to drive the image area sensor. A signal from the imaging unit is sent to the image processing apparatus via a flexible substrate, a sub substrate, and a transmission cable. The image processing apparatus performs image processing on the signal and displays an image such as a lesion on the monitor.

  A transmission cable for sending a signal from the imaging unit to the image processing apparatus is composed of a composite multi-core cable. Since this transmission cable is inserted through the entire length of the insertion portion, the transmission cable is strongly pushed and pulled each time the insertion portion is looped or curved. When the transmission cable is drawn, the joint portion of the substrate may be peeled off or the transmission cable may be cut.

  In order to avoid such peeling and cutting, various proposals have been made. For example, in the endoscope described in Patent Document 1, the transmission cable is soldered to one end side of the flexible substrate, and the flexible substrate is folded into a U-shape so as to surround the soldered transmission cable. The periphery is covered with a shield tape and an insulating tape, and this internal space is filled with an epoxy adhesive so as not to be deformed. Furthermore, since the circuit board on the side to which the transmission cable is fixed is fixed to the connecting cylinder by the fixing screw via the holding plate, even if the transmission cable is strongly pushed and pulled, the circuit board does not move, and the transmission cable The twisting or tilting force applied to the circuit board is absorbed by the flexible circuit board and is not transmitted to the image area sensor and the objective optical system.

  In the camera module described in Patent Document 2, the connection portion between the flexible substrate and the transmission cable is covered and sealed with a sealing material.

  The camera module described in Patent Document 3 includes a reinforcing frame that accommodates an image area sensor and an electronic component mounting portion of a flexible substrate, and an adhesive is filled inside the reinforcing frame. Furthermore, the front end portion of the transmission cable soldered to the flexible substrate and the reinforcing frame are covered with a heat shrinkable tube, and the inside is filled with an adhesive and sealed.

  The camera module described in Patent Document 4 includes a mechanism for changing the focal length of the photographing lens, and the focal length can be switched between normal observation and magnified observation. In such a camera module, the photographic lens unit and the imaging unit are configured to be separable, and are fixed to the photographic lens unit via the prism holder of the imaging unit and integrated to form a camera module. Yes.

Japanese Patent Application Laid-Open No. 5-261644 Japanese Patent Laid-Open No. 9-146011 JP 2008-118568 A JP 2004-283486 A

  The camera module described in Patent Document 1 has a drawback that a complicated operation of fixing the circuit board to the connecting cylinder with a fixing screw is required. In the camera module described in Patent Document 2, the force with which the transmission cable is pushed and pulled is transmitted to the joint portion with the flexible substrate and the flexible substrate. The force transmitted to the flexible board is applied to the soldered part between the transmission cable and the flexible board, the joint part between the flexible board and the image area sensor, etc., and there is a concern that peeling or breakage may occur in any of these weak areas. .

  In the camera module described in Patent Document 3, the size of the reinforcing frame is affected by the size of the image area sensor because the image area sensor is housed inside the reinforcing frame. The demands for endoscopes are diversifying, such as higher image quality, smaller diameters, and compatibility with autoclaves. Along with this, image area sensors and their peripheral parts are also becoming more diverse and complex. If the size of the image area sensor and its peripheral components increases, the reinforcement frame that accommodates all of them will also increase in size, increasing the diameter of the hard end of the endoscope insertion section and increasing the burden on the patient. There is a drawback of doing.

  In the camera module described in Patent Document 4, a prism is fixed through a prism holder, and an imaging element, a circuit board, and the like are fixed to the fixed prism. Further, a transmission cable is connected to the circuit board. For this reason, a pulling force acts on the connection portion of the transmission cable, causing disconnection. Although the prism and the image area sensor are bonded on the entire surface, the prism holder has an opening so that light from the photographic lens unit is incident on the incident surface of the prism. It becomes possible, and only the peripheral portion of the incident surface and the holder are bonded, and when the transmission cable is pulled, the prism may be peeled off from this portion.

  The present invention has been made in view of the above problems, and even when the transmission cable is strongly pushed and pulled, breakage of parts such as the transmission cable, flexible substrate, and image area sensor, joints thereof, and prism holder It is an object of the present invention to provide an imaging unit for an endoscope and a camera module that can suppress the occurrence of separation of the prism and reduce the burden on the patient by reducing the diameter of the hard tip portion.

  To achieve the above object, the present invention provides a prism having an entrance surface, a reflection surface, an exit surface, and both side surfaces, an opening through which incident light enters the entrance surface of the prism, and a peripheral portion of the entrance surface of the prism. A prism fixing surface to which the prism is fixed, a prism holding frame that protrudes from the prism fixing surface and positions the prism on the prism fixing surface, an image area sensor that is attached to the emission surface of the prism, and A circuit board for driving the image area sensor, a wire connected to the circuit board and a transmission cable having a sheath for bundling and protecting the wire, and one end fixed to the skin of the transmission cable, and the other end And a cable connector attached to the positioning piece.

  It is preferable that a locking portion is formed on the positioning piece, and a locking claw that locks the locking portion is formed on the other end of the cable connector. Further, it is preferable that the locking claw is fixed to the positioning piece. It is preferable that the positioning piece has a first positioning piece that comes into contact with a ridge line where the incident surface and the reflecting surface intersect. Furthermore, it is preferable that the positioning piece has a second positioning piece that comes into contact with one of the side surfaces.

  An endoscope camera module according to the present invention includes a photographing lens, a photographing lens unit having a housing that holds the photographing lens, and the endoscope imaging unit, and the prism holding frame holds the housing. It has a frame part.

  According to the present invention, since the transmission cable has the cable connector that has one end fixed to the outer sheath of the transmission cable and the other end attached to the positioning piece of the prism holding frame, the transmission portion of the transmission cable is bent repeatedly. Even when pulled, the pulling force is transmitted to the prism holding frame by the cable connector, so that the pulling force does not act on the prism, the circuit board, etc., and the prism is not peeled off or disconnected. In addition, since the cable connector is attached using the prism positioning piece, it is not necessary to provide a separate attachment piece or the like, and the configuration is simplified. In addition, the dead space behind the prism can be used effectively.

It is a perspective view which decomposes | disassembles and shows a photographic lens unit. It is the perspective view which looked at the housing from front diagonally. It is sectional drawing which decomposes | disassembles and shows a photographic lens unit. It is principal part sectional drawing of the camera module of a standard position. It is principal part sectional drawing of the camera module of an expansion position. It is a perspective view which decomposes | disassembles and shows the camera module of this invention. It is a perspective view which shows a prism holding frame. It is a perspective view which shows the external appearance of the whole camera module. It is a perspective view which shows the structure of an electronic endoscope system. It is a perspective view which shows the front-end | tip part of an electronic endoscope.

  As shown in FIGS. 1 to 3, the photographing lens unit 11 includes a housing 13, a photographing lens 14 housed in the housing 13, and a lens moving unit 15.

  The photographing lens 14 is configured by sequentially arranging a first fixed lens 21, a first movable lens 22, a second movable lens 23, and a second fixed lens 24 in the optical axis direction. Each of the fixed lenses 21 and 24 and each of the movable lenses 22 and 23 includes a lens frame 21a to 24a and one or a plurality of lens bodies 21b to 24b held by the lens frames 21a to 24a.

  The lens moving unit 15 includes a cam shaft 25, and a first lens moving frame 26 and a second lens moving frame 27 that slide on the cam shaft 25. The lens moving unit 15 moves the movable lenses 22 and 23 in the optical axis direction and changes the focal length of the photographing lens 14 to enable variable magnification photographing.

  The housing 13 is configured by arranging the first cylinder part 30 and the second cylinder part 31 in a direction orthogonal to the cylinder center direction and connecting them with a connecting part 32. As shown in FIG. 2, the outer diameter of the second cylindrical portion 31 is slightly smaller than the outer diameter of the first cylindrical portion 30, and has an 8-shape when viewed from the front. A photographing lens storage hole 33 is formed in the first tube portion 30, and the photographing lens 14 is stored in the hole 33. A lens moving part storage hole 34 is formed in the second cylinder part 31 to store the lens moving part 15. As shown in FIG. 3, a locking ring 34 a projects from the lens moving part storage hole 34. Further, a sliding hole 35 for connecting the taking lens storage hole 33 and the lens moving part storage hole 34 is formed in the connection part 32.

  As shown in FIGS. 1 and 3, the cam shaft 25 has two cam grooves 25a and 25b on the outer peripheral surface, and is engaged with the wire connecting hole 25c along the axis at the rear end and on the outer peripheral surface of the rear end portion. It has a flange 25d. As shown in FIG. 4, the tip end of the wire 18 for rotational driving is fixed in the wire connecting hole 25c. The wire 18 is put in the protective tube 19 and connected to a motor 80 (see FIG. 9) in the hand operating section 67. The motor 80 is driven and controlled by a controller (not shown) so as to rotate forward or reverse by operation of the seesaw switch 79 of the hand operation unit 67.

  As shown in FIGS. 1 and 3, a fixing ring 29 is attached to the tip of the cam shaft 25. As shown in FIG. 4, the fixing ring 29 allows the cam shaft 25 to rotate smoothly without tilting in the lens moving portion accommodation hole 34. Further, since the locking flange 25d on the rear end side of the cam shaft 25 is locked to the locking ring 34a, the cam shaft 25 does not come out of the lens moving part storage hole 34.

  As shown in FIGS. 1 and 3, the first lens moving frame 26 includes a guide tube 26a, a lens frame 22a, and an arm 26b that connects them, and these are integrally formed. Similarly, the second lens moving frame 27 has a guide tube 27a, a lens frame 23a, and an arm 27b, and is integrally formed. A first engagement pin 28a is attached to the guide tube 26a of the first lens moving frame 26, and the tip of the engagement pin 28a enters the first cam groove 25a. An engagement pin 28b is attached to the guide tube 27a of the second lens moving frame 27, and the second engagement pin 28b enters the second cam groove 25b.

  When the camshaft 25 is rotated forward or reversely by the motor 80 (see FIG. 9), the camshaft 25 is rotationally displaced in accordance with the amount of rotation, and the rotational displacement causes the first and second via the engagement pins 28a and 28b. The second lens moving frames 26 and 27 move in the optical axis direction within the housing 13.

  4 and 5 illustrate switching of the focal length of the photographing lens. FIG. 4 shows a standard position and FIG. 5 shows an enlarged position. In the enlarged position, the first lens moving frame 26 moves to the front side from the standard position, and the second lens moving frame 27 moves to the rear side from the standard position.

  In the present embodiment, the arms 26b and 27b of the first and second lens moving frames 26 and 27 are moved so that the first and second lens moving frames 26 and 27 move smoothly in the optical axis direction by the rotation of the cam shaft 25. These parts are measured and combined within a 3 ± 3μm gap so that the gap between the sliding holes and the sliding guide surface distance of the sliding holes is 3 ± 3μm, for example. These are used as a set.

  As shown in FIG. 3, the photographing lens storage hole 33 has a first storage portion 33 a for storing the first fixed lens 21 and the first movable lens 22 in order from the front end to the rear end of the housing 13, and a second movable lens. A second storage portion 33b for storing the second storage lens 23 and a third storage portion 33c for storing the second fixed lens 24 are formed. A ring protrusion 33d serving as a partition is formed between the second storage portion 33b and the third storage portion 33c. The second storage portion 33b is formed slightly smaller than the inner diameter of the first storage portion 33a, and the second storage portion 33b and the third storage portion 33c are formed with the same inner diameter.

  A second antireflection cylinder 37 is accommodated in the second accommodating portion 33b. The second antireflection cylinder 37 is formed in a cylindrical shape, and has a slit 37a in the optical axis direction. The arm 27b of the second lens moving frame 27 enters the slit 37a, and the lens frame 23a of the second lens moving frame 27 enters the cylinder. The cylinder inner diameter is formed slightly larger than the outer diameter of the lens frame 23a, and the lens frame 23a does not contact the inner peripheral surface of the cylinder portion when the lens frame 23a moves in the cylinder portion.

  The first antireflection cylinder 36 is stored in the first storage portion 33a. The first antireflection tube 36 is also formed in the same manner as the second antireflection tube 37, and has a slit 36a. The difference from the second antireflection cylinder 37 is that a diaphragm plate 38 is integrally formed at the rear end. The rear end surface of the first antireflection tube 36 is locked by the step surface 33e between the first storage portion 33a and the second storage portion 33b, and is positioned when stored. In the first antireflection cylinder 36, the lens frame 22a of the first lens moving frame 26 moves.

  As shown in FIG. 6, in order to prevent the occurrence of flare, a first lens moving frame 26 integrally including a lens frame 21a of the first fixed lens 21 and a lens frame 22a of the first movable lens 22, and a second movable frame. The second lens moving frame 27 having the lens frame 23a of the lens 23, the lens frame 24a of the second fixed lens 24, and the first and second antireflection tubes 36 and 37 are black-dyed, and a black layer is formed on the surface thereof. 39 is formed. Any of the known methods may be used for the black dyeing process. For example, the black layer 39 is formed by chemical treatment using a black dyeing treatment liquid. In addition, since the black layer 39 appears as a cross section with a slight thickness, the illustration with the thickness added is omitted. On the other hand, the housing 13 has a complicated shape and is a minute part having an outer diameter of about 7 mm × 4 mm × 15 mm. Therefore, the black layer 39 having a desired thickness is not formed on the inner peripheral surface. There is also no black dyeing process.

  As shown in FIG. 3, the second cylindrical portion 31 is formed longer than the first cylindrical portion 30 in order to accommodate the cam shaft 25. The leading ends of the second cylindrical portions 31 are aligned with each other, and the rear ends of the second cylindrical portions 31 are formed so as to protrude rearward from the rear ends of the first cylindrical portions 30. A space is generated on the rear end side of the first cylindrical portion 30 due to the step difference between the two cylindrical portions 30 and 31. Using this space, as shown in FIG. 6, an imaging unit 12 is attached to the photographing lens unit 11 to constitute a camera module 10.

  For this reason, the rear half 30a of the outer peripheral surface of the first cylindrical portion 30 of the housing 13 is formed to have a slightly smaller outer diameter than the front half 30b of the outer peripheral surface, and between the front half 30b and the rear half 30a. A step surface 30c is formed. The imaging unit 12 is attached to the rear half 30a of the outer peripheral surface. Thus, by arranging the imaging unit 12 in the space on the rear end side of the first tube portion 30, the camera module 10 can be configured compactly as a whole.

  The imaging unit 12 includes a prism holder 40, a prism 41, a CCD image sensor 42, a circuit board 43, a transmission cable 44, a cable connector 45, a heat radiating plate 49, and a sealant (not shown) that seals wiring. Have The hole 48 formed in the housing 13 is for injecting adhesive and inserting screws when the antireflection tubes 36 and 37 and the second fixed lens 24 are fixed in the photographing lens storage hole 33. Provided as needed.

  As shown in FIGS. 4 and 7, the prism holder 40 includes an attachment tube portion 40 a and a prism attachment frame 40 b. The prism 41 is composed of a right-angle prism having five surfaces, that is, an incident surface 41a and an output surface 41b that intersect at right angles, a reflective surface 41c that is a slope, and both side surfaces 41d. The prism mounting frame 40b has an opening 40c through which incident light from the photographing lens 14 passes, and has a first positioning piece 40d and a second positioning piece 40e on the rear end surface. As shown in FIG. 8, the first positioning piece 40 d abuts on a ridge line 41 f where the incident surface 41 a and the exit surface 41 b of the prism 41 are orthogonal to each other, and the second positioning piece 40 e abuts on the side surface 41 d of the prism 41. When the side surface 41d and the ridge line 41f of the prism 41 are in contact with the two positioning pieces 40d and 40e, the prism 41 can be easily positioned on the prism mounting frame 40b. Therefore, it is not necessary to use a separate position restricting jig or the like when assembling minute parts, and assembly can be performed easily and accurately.

  As shown in FIG. 4, an image area sensor 42 is attached to the emission surface 41 b of the prism 41, and a circuit board 43 for driving the image area sensor 42 is attached to the slope of the prism 41 with an adhesive. The image area sensor 42 and the circuit board 43 are connected to a connection, a flexible wiring circuit board 52 and the like. An element wire (signal line) 44 a of the transmission cable 44 is connected to the circuit board 43 or the flexible wiring circuit board 52. The transmission cable 44 includes a plurality of strands 44a, a shield wire 44b that bundles and shields them, and an outer sheath 44c that covers the shield wire 44b. The circuit board 43 may have a sub board in addition to the main board. A heat radiating plate 49 also serving as sensor protection is fixed to the outside of the image area sensor 42. A cable receiving portion 49 a is formed at the rear end of the heat radiating plate 49, and the cable receiving portion 49 a is soldered to the shield wire of the transmission cable 44. The heat radiating plate 49 releases heat from the image area sensor 42 to the transmission cable 44.

  One end of the cable connector 45 is fixed to the outer cover 44c of the transmission cable 44 by an adhesive on the side opposite to the cable receiving portion 49a of the heat radiating plate 49. The cable connector 45 includes a reinforcing frame 45a and a connecting piece 45b. The reinforcing frame 45a is formed in a U-shaped cross section by bending both side portions of the metal plate. The connecting piece 45b has a stepped portion 53 formed by bending a flat plate. The step portion 53 is provided as necessary, and the height of the step portion is appropriately set according to the size of the circuit board 43, the connection, and the like housed inside the reinforcing frame 45a.

  A locking claw 45d is bent at the tip of the connecting piece 45b of the cable connector 45. The locking claw 45d enters and locks into a locking hole 47 formed in the first positioning piece 40d. By providing a locking hole 47 in the first positioning piece 40d and arranging the cable connector 45, the cable connector 45 can be arranged in an empty space behind the prism, and the imaging unit is strong against pulling of the transmission cable. 12 can be put together compactly.

  A sealant (not shown) is injected into these gaps as necessary in order to protect the connection parts and the wires covered by the cable connector 45, the image area sensor 42, and the circuit board 43. Solidified.

  In the present embodiment, the first positioning piece 40d including the locking claw 45d and the locking hole 47 and the connecting piece 45b are fixed and integrated with an adhesive. In addition, the positioning piece 40d and the connecting piece 45b may be used in a locked state without being fixed by an adhesive, and in this case, the cable is formed in the gap between the locking hole 47 and the locking claw 45d. The connecting tool 45 can swing, and the bending force does not act on the fixing portion between the cable connecting tool 45 and the outer cover 44c of the cable 44, and the strength of the fixing portion can be improved accordingly.

  The reinforcing frame 45 a of the cable connector 45 is formed so as not to cover the image area sensor 42. Therefore, even when the size of the image area sensor 42 is changed, even if the image area sensor 42 becomes larger due to the size change, it does not come into contact with the reinforcing frame 45a, and the size of the image area sensor 42 can be changed. Is possible. Further, since the heat radiating plate 49 that protects the image area sensor 42 is not a frame shape but a plate shape, even if the size of the image area sensor is changed, the size can be changed with the current structure.

  In the above-described embodiment, the locking portion is configured by forming the locking hole 47 in the positioning piece 40e and locking the locking claw 45d. However, instead of the locking hole 47, the locking piece 47e has a locking step. A part or a locking projection may be formed, and the locking claw 45d may be locked to these.

  The camera module 10 configured as described above is attached to the distal end portion of the endoscope 60 as shown in FIG. The electronic endoscope system 59 includes an electronic endoscope 60, a processor device 61, and a light source device 62. The electronic endoscope 60 includes a flexible insertion portion 66 that is inserted into a body cavity of a patient, a hand operation portion 67 that is connected to a proximal end portion of the insertion portion 66, a processor device 61, and a light source device 62. It has a connector 69a to be connected, a hand operating section 67, and a universal cord 69 that connects the connectors 69a.

  The insertion portion 66 includes a distal end portion 66a, a bending portion 66b, and a flexible portion 66c in order from the distal end. The tip portion 66a is configured by covering a tip portion body made of a hard resin with a tip cap made of a soft resin, and covering the tip portion body and a metal tip tube of the curved portion 66b following the tip portion body with a tube. The curved portion 66b has a unit in which each node ring is pin-coupled, and the whole is curved. The bending portion 66b is bent at an arbitrary angle in the vertical and horizontal directions by the rotation operation of the angle knob 70 of the hand operation portion 67. Thereby, the observation part in a body cavity can be imaged with the camera module 10 with the front-end | tip part 66a facing the desired direction in a body cavity. The soft portion 66c is a portion that connects the hand operating portion 67 and the bending portion 66b in a narrow shape with a long diameter, and has flexibility.

  As shown in FIG. 10, in addition to the forceps outlet 72, an observation window 73, illumination windows 74a and 74b, and an air / water supply nozzle 75 are provided on the distal end surface of the distal end portion 66a. In addition, a water jet outlet and other nozzles are provided as necessary.

  The hand operation unit 67 includes various operation members such as an angle knob 70, an air / water supply button 76, a suction button 77, a release button 78, and a seesaw switch 79 for zoom operation. The angle knob 70 bends the distal end portion 66a of the insertion portion 66 in the vertical and horizontal directions by a rotation operation. The air / water supply button 76 ejects air or water from the air / water supply nozzle 75 by a pressing operation. The suction button 77 sucks a suction target such as a liquid or tissue in the body from the forceps outlet 72 by a pressing operation. The release button 78 records an observation image as a still image by the camera module 10 by a pressing operation. The seesaw switch 79 rotates the motor 80 forward or backward and transmits this rotation to the camshaft 25 via the wire 18 to switch the photographing lens 14 between standard and magnified photographing.

  The processor device 61 is electrically connected to the light source device 62 and comprehensively controls the operation of the electronic endoscope system 59. The processor device 61 supplies power to the electronic endoscope 60 through the universal cord 69 and the transmission cable 44 inserted into the insertion portion 66, and controls the driving of the camera module 10 at the distal end portion 66a. Further, the processor device 61 receives a signal from the camera module 10 via the transmission cable 44 and performs various processes to generate image data. A monitor 81 is connected to the processor device 61. The monitor 81 displays an observation image based on the image data from the processor device 61.

  In the above-described embodiment, an example in which two movable lenses 22 and 23 are used as the photographing lens unit 11 has been described. Further, the present invention may be applied to a fixed-focus photographing lens unit instead of a movable lens that performs zooming or focusing. Moreover, although the example using a CCD image area sensor as an image sensor has been described, a CMOS image sensor may be used as the image sensor. Moreover, although the said embodiment demonstrated the example which applies this invention to a medical endoscope, you may apply this invention to an industrial endoscope.

DESCRIPTION OF SYMBOLS 10 Camera module 11 Shooting lens unit 12 Imaging unit 14 Shooting lens 15 Lens moving part 40 Prism holders 40a and 40b Positioning piece 41 Prism 42 CCD type image area sensor 44 Transmission cable 45 Cable connector 45d Locking claw 47 Locking hole 59 Electronic endoscope system 60 Endoscope 66 Insertion section 67 Hand control section

Claims (6)

A prism having an entrance surface, a reflection surface, an exit surface, and both side surfaces;
An opening through which incident light to the incident surface of the prism passes, a prism fixing surface to which a peripheral portion of the incident surface of the prism is fixed, and a positioning that projects from the prism fixing surface and positions the prism on the prism fixing surface A prism holding frame having a piece;
An image area sensor attached to the exit surface of the prism;
A circuit board for driving the image area sensor;
A transmission cable having a strand connected to the circuit board and a sheath for bundling and protecting the strand;
An endoscope imaging unit, comprising: a cable connector having one end fixed to the outer cover of the transmission cable and the other end attached to the positioning piece.   The endoscope according to claim 1, wherein a locking portion is formed on the positioning piece, and a locking claw that locks the locking portion is formed on the other end of the cable connector. Imaging unit.   The endoscope imaging unit according to claim 2, wherein the locking claw is fixed to the positioning piece.   The imaging unit for an endoscope according to any one of claims 1 to 3, wherein the positioning piece includes a first positioning piece that abuts on a ridge line where the incident surface and the reflecting surface intersect.   5. The endoscope imaging unit according to claim 4, wherein the positioning piece includes a second positioning piece that abuts one of the side surfaces. A photographic lens, a photographic lens unit having a housing for holding the photographic lens;
6. The endoscope camera module according to claim 1, wherein the prism holding frame includes a holding frame portion that holds the housing. 7.

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