JP2017192752A - Imaging device, method for manufacturing imaging device, and endoscope device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an imaging device which can be miniaturized and whose manufacturing process can be made efficient, a method for manufacturing an imaging device, and an endoscope device.SOLUTION: An imaging device 10 includes: an image pick-up device 11; an objective optical system 12 including an optical element 21 adjoining the image pick-up device 11 that bends an incident optical path extending in a direction intersecting with a normal line direction of an image receiving surface of the image pick-up device 11 in the normal line direction by the optical element 21; a rigid circuit board part 13, part 13a of which is arranged overlapping with the optical element 21 in the normal direction on the side opposite to the image pick-up device 11; and a connection board part 14 that connects the image pick-up device 11 and the circuit board part 13. A section 14a between the image pick-up device 11 and the circuit board part 13 in the connection board part 14 is flexible.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an imaging apparatus, a manufacturing method of the imaging apparatus, and an endoscope apparatus including the imaging apparatus.

  As an example of an endoscope apparatus, an apparatus including a prism that bends an incident optical path in an objective optical system and including an imaging apparatus in which the prism is provided adjacent to an imaging element is known (for example, see Patent Documents 1 and 2). .

  In the imaging devices described in Patent Literatures 1 and 2, a flexible substrate is used as a circuit board connected to the imaging device, and the imaging device can be downsized by appropriately folding the flexible substrate. For example, in the imaging apparatus described in Patent Document 2, a part of the folded flexible substrate is superimposed on the prism on the side opposite to the imaging element.

  In the imaging devices described in Patent Documents 3 and 4, flexible substrates are also used for the purpose of downsizing the imaging device.

Japanese Patent No. 3340257 JP 2011-224349 A Japanese Patent No. 5000357 JP 2013-179574 A

  In the imaging device described in Patent Document 2 in which the circuit board is configured by a flexible substrate, the prism can be arranged on the imaging element, and then the flexible substrate can be folded and overlapped on the prism. Therefore, it is possible to align the objective optical system including the prism and the imaging element in a state where the imaging element and the flexible substrate are connected in advance, and the objective optical system is confirmed by checking the image output from the imaging element. And the image sensor can be aligned with high accuracy. However, after the alignment between the objective optical system and the image sensor is completed, a step of folding and fixing the flexible substrate is necessary, and there is room for improvement in terms of improving the efficiency of the manufacturing process of the image pickup apparatus.

  The present invention has been made in view of the above-described circumstances, and an object thereof is to provide an imaging apparatus, an imaging apparatus manufacturing method, and an endoscope apparatus that can be miniaturized and can improve the manufacturing process.

An imaging apparatus according to one embodiment of the present invention includes an imaging element and an optical element provided adjacent to the imaging element, and an incident optical path extending in a direction intersecting a normal direction of an image receiving surface of the imaging element is defined by the optical element. An objective optical system that bends in the normal direction, a rigid circuit board portion that is partially overlapped with the optical element on the opposite side of the image sensor in the normal direction, the image sensor, and the image sensor A connection board part connecting the circuit board part, and at least a portion of the connection board part between the imaging element and the circuit board part is flexible.
In the endoscope apparatus according to one aspect of the present invention, the imaging apparatus is mounted on an endoscope distal end portion that is inserted into a subject.
The manufacturing method of the imaging device of one embodiment of the present invention includes: an imaging element; and a rigid circuit board portion that is partially overlapped with the imaging element in a normal direction of the image receiving surface of the imaging element. The section of the connecting substrate portion of the module connected by the connecting substrate portion configured flexibly in at least a part of the section between the image pickup device and the circuit board portion is bent to overlap the image pickup device. An objective optical system including an optical element that retracts a part of the circuit board unit from above the image sensor and bends an incident optical path extending in a direction intersecting a normal direction of an image receiving surface of the image sensor in the normal direction. Move in the normal direction, place the optical element next to the imaging element, restore the bent section of the connecting board part, and part of the circuit board part overlapping the imaging element. Take the picture in the normal direction The element is arranged to overlap with the optical element on the opposite side.

  ADVANTAGE OF THE INVENTION According to this invention, the manufacturing method of an imaging device which can be reduced in size and can improve a manufacturing process efficiently, an imaging device, and an endoscope apparatus can be provided.

It is a figure which shows the structure of an example of the insertion part front-end | tip part of the endoscope apparatus for demonstrating embodiment of this invention. It is a figure which shows the structure of an example of the imaging device mounted in the insertion part front-end | tip part of the endoscope apparatus of FIG. It is a figure which shows the state which bent the flexible area of the connection board | substrate part of the imaging device of FIG. It is a figure which shows the structure of the modification of the imaging device of FIG. It is a figure which shows the structure of the other modification of the imaging device of FIG. It is a figure which shows the structure of the other modification of the imaging device of FIG. It is a figure which shows the structure of the other modification of the imaging device of FIG. It is a figure which shows the structure of the other modification of the imaging device of FIG. It is a figure which shows the structure of the other modification of the imaging device of FIG. It is a figure which shows the structure of the other modification of the imaging device of FIG. It is a figure which shows the structure of the other modification of the imaging device of FIG. It is a figure which shows an example of the manufacturing method of the imaging device of FIG.

  FIG. 1 shows an exemplary configuration of an endoscope apparatus for explaining an embodiment of the present invention.

  The endoscope apparatus 1 includes an insertion unit 2 to be inserted into a subject, an operation unit 3 connected to the insertion unit 2, and a universal cord 4 extending from the operation unit 3.

  An illumination optical system that emits illumination light that illuminates the subject and an imaging device 10 that images the illuminated subject are provided at the distal end of the insertion unit 2.

  A connector is provided at the end of the universal cord 4, and the endoscope apparatus 1 processes the image signal acquired by the light source device that generates illumination light and the imaging device 10 via the connector at the end of the universal cord 4. Connected to the processor device.

  2 and 3 show the configuration of the imaging apparatus 10.

  The image pickup apparatus 10 includes an image pickup device 11 such as a charge coupled device (CCD) image sensor or a complementary metal oxide semiconductor (CMOS) image sensor, an objective optical system 12 that forms a subject image on the image receiving surface of the image pickup device 11, and a rigid. The circuit board part 13 and the connection board part 14 which connects the image pick-up element 11 and the circuit board part 13 are provided.

  The objective optical system 12 includes a lens group 20 and an optical element 21 provided adjacent to the imaging element 11.

  The lens group 20 is disposed along an optical axis A that is substantially orthogonal to the normal line N of the image receiving surface of the image sensor 11. The lens group 20 captures light from the subject and guides the captured light along the optical axis A. To do.

  The optical element 21 is a prism in the illustrated example, and is an incident surface 21a on which a light beam guided by the lens group 20 is incident, and a reflection surface that obliquely intersects the normal N of the image receiving surface of the image sensor 11 and the optical axis A. 21b and an exit surface 21c facing the image receiving surface of the image sensor 11. The exit surface 21c is in close contact with the cover glass that covers the image receiving surface of the image sensor 11. In this example, the exit surface 21c and the cover glass are bonded.

  The optical element 21 bends the incident optical path along the optical axis A in the normal direction of the image receiving surface of the image sensor 11 at the reflecting surface 21b, and emits the light beam incident on the incident surface 21a toward the image receiving surface of the image sensor 11. The light exits from 21c.

  In addition, although the prism was illustrated as the optical element 21, the optical element 21 may be, for example, a mirror disposed obliquely with respect to the normal line N of the image receiving surface of the imaging element 11 and the optical axis A.

  The rigid circuit board unit 13 includes a drive circuit for the image sensor 11 and a signal processing circuit for processing the output signal of the image sensor 11 to generate image data. Since the circuit board portion 13 is rigid, the workability in mounting electronic components constituting the drive circuit and the signal processing circuit is enhanced as compared with the case where the circuit board portion 13 is flexible.

  The circuit board portion 13 is disposed behind the optical element 21, and a part 13 a of the circuit board portion 13 is overlapped with the optical element 21 on the side opposite to the imaging element 11.

  In the illustrated example, the circuit board unit 13 includes a plurality of rigid boards 22 on which electronic components constituting a driving circuit and a signal processing circuit are mounted, and these rigid boards 22 are normal to the image receiving surface of the image sensor 11. They are stacked in the direction. The rigid substrate 22 is extended to the optical element 21 side, and each end of the rigid substrate 22 overlaps the optical element 21 on the opposite side of the imaging element 11 along the reflective surface 21b of the optical element 21. It has been. According to such a configuration, the space behind the optical element 21 can be used effectively, and the mounting area of the electronic components on the circuit board unit 13 can be expanded.

  In the example shown in the drawing, the connecting substrate portion 14 is entirely constituted by a flexible substrate, and the imaging element 11 is mounted on one end portion of the connecting substrate portion 14 and the circuit substrate portion 13 is mounted on the other end portion. ing.

  In addition, a wiring group 15 is connected to an end portion of the connecting board portion 14 on which the circuit board portion 13 is mounted. The wiring group 15 includes a power supply line that supplies operating power to circuits included in the imaging element 11 and the circuit board unit 13, a signal line that transmits an image signal output from the signal processing circuit of the circuit board unit 13, and the like.

  A section 14a between the imaging element 11 and the circuit board part 13 in the connecting board part 14 on which the imaging element 11 and the circuit board part 13 are mounted is flexible, and as shown in FIG. The circuit board part 13 arranged so as to overlap with each other can be retracted from the optical element 21 by bending the flexible section 14 a of the connection board part 14.

  The term “flexible” used for the section 14 a of the connecting board portion 14 and the flexible substrate constituting the connecting board portion 14 is to retract a part 13 a of the circuit board portion 13 that overlaps the optical element 21 from the optical element 21. It means that the object has the flexibility to bend at least as much as possible. On the other hand, the term “rigid” used for the circuit board part 13 and the rigid board 22 constituting the circuit board part 13 is not limited to the above “flexible” even if the object is substantially rigid or bent. It means that there is no flexibility.

  FIG. 4 shows a configuration of a modified example of the imaging apparatus 10.

  In the example shown in FIG. 4, the connecting board portion 14 is configured as a so-called rigid flexible board, and includes a flexible board 30 and a rigid circuit board connecting portion 31 provided at one end of the flexible board 30. . The circuit board part 13 is stacked on the circuit board connection part 31 and connected to the circuit board connection part 31, and the wiring group 15 is also connected to a terminal part provided in the circuit board connection part 31. The image sensor 11 is mounted on the other end of the flexible substrate 30 in the same manner as the image pickup apparatus 10 described above.

  In the illustrated example, the circuit board connecting portion 31 is configured by bonding a rigid board 32 to one side of the flexible board 30 on which the imaging element 11 is mounted. The circuit pattern formed on the rigid board 32 and the circuit pattern formed on the flexible board 30 are electrically connected to each other through, for example, a through hole provided in the rigid board 32.

  The circuit board part in which the section 14b between the image pickup element 11 and the circuit board connection part 31 in the connecting board part 14 on which the image pickup element 11 is mounted is flexible, and a part 13a is overlapped with the optical element 21. 13 is configured to be retractable from the optical element 21 by bending the flexible section 14b of the connecting substrate portion 14.

  If the rigid circuit board connection part 31 is provided in the connection board part 14 and the circuit board part 13 is mounted on the circuit board connection part 31 as in this example, the workability is improved as compared with the mounting on the flexible board. Can be increased.

  FIG. 5 shows a configuration of another modified example of the imaging apparatus 10.

  In the example shown in FIG. 5, a circuit board connecting portion 31 is configured by bonding a rigid board 32 to both surfaces of a flexible board 30. According to such a configuration, a space corresponding to the thickness of the rigid substrate 32 is generated directly below the image sensor 11 along the surface of the flexible substrate 30 opposite to the side on which the image sensor 11 is mounted. It is possible to mount a functional component such as a heat radiating sheet that radiates heat generated in the image sensor 11 and a component 33 such as an electronic component that constitutes a drive circuit or a signal processing circuit of the image sensor 11.

  In the connection board part 14 having the flexible board 30 and the circuit board connection part 31, the thermal conductivity of the circuit board connection part 31 is preferably higher than the thermal conductivity of the flexible board 30. By making the thermal conductivity of the circuit board connecting portion 31 relatively high, the heat generated in the circuit board portion 13 can be quickly transmitted to the wiring group 15, and the heat is transmitted to the imaging element 11 through the flexible substrate 30. The noise of the image sensor 11 can be reduced by suppressing this.

  Generally, a phenolic resin substrate or a glass epoxy substrate is used as the rigid substrate 32 constituting the circuit board connecting portion 31, but a ceramic substrate made of aluminum nitride or the like having a higher thermal conductivity than the phenolic resin or glass epoxy is used. It can be used suitably.

  6 and 7 show configurations of other modified examples of the imaging apparatus 10, respectively.

  In the example shown in FIG. 6 and FIG. 7, a rigid image sensor connection unit 34 is provided at one end of the flexible substrate 30 of the connecting substrate unit 14 configured as a rigid flexible substrate, and the rigid image sensor connection unit 34 performs imaging. The elements 11 are stacked and connected. The circuit board portion 13 is mounted on the other end portion of the flexible substrate 30 in the same manner as the imaging device 10 described above.

  The section 14c between the image pickup device connecting portion 34 and the circuit board portion 13 in the connecting board portion 14 on which the circuit board portion 13 is mounted is flexible, and a circuit in which a part 13a is arranged to overlap the optical element 21. The substrate portion 13 can be retracted from the optical element 21 by bending the flexible section 14 c of the connecting substrate portion 14.

  As shown in FIG. 6, the image sensor connection unit 34 may be configured by bonding a rigid substrate 32 to one side of the flexible substrate 30 on which the image sensor 11 is mounted. As shown in FIG. 7, The rigid substrate 32 may be bonded to both surfaces of the flexible substrate 30.

  When the rigid substrate 32 is bonded to both surfaces of the flexible substrate 30 to form the image sensor connection portion 34, the circuit board portion extends along the surface of the flexible substrate 30 opposite to the side on which the image sensor 11 is mounted. A space corresponding to the thickness of the rigid substrate 32 is created immediately below the space 13, and in that space, for example, a functional component such as a heat dissipation sheet that dissipates heat generated in the circuit board portion 13, a drive circuit or a signal processing circuit of the image sensor 11 It is possible to mount a component 33 such as an electronic component constituting the.

  8 to 11 show configurations of other modifications of the imaging device 10, respectively.

  In the example shown in FIGS. 8 to 11, a rigid circuit board connecting portion 31 is provided at one end of the flexible substrate 30 of the connecting substrate portion 14 configured as a rigid flexible substrate, and an image sensor is connected to the other end. The circuit board part 13 is laminated and connected to the rigid circuit board connection part 31, and the imaging element 11 is laminated and connected to the rigid image sensor connection part 34.

  The section 14d between the image pickup device connection portion 34 and the circuit board connection portion 31 in the connection board portion 14 is flexible, and the circuit board portion 13 in which a part 13a is placed on the optical element 21 is connected to the connection board. The flexible section 14d of the portion 14 can be bent to be retracted from the optical element 21.

  The circuit board connection unit 31 may be configured by bonding the rigid board 32 to one side of the flexible board 30 on which the imaging element 11 is mounted, or may be configured by bonding the rigid board 32 to both sides of the flexible board 30. May be. The image sensor connection portion 34 may also be configured by bonding the rigid substrate 32 to one side of the flexible substrate 30 on which the image sensor 11 is mounted, or the rigid substrate 32 may be bonded to both surfaces of the flexible substrate 30. It may be configured.

  As shown in FIG. 9, a rigid substrate 32 is bonded to both surfaces of the flexible substrate 30 to form a circuit board connection portion 31, and a rigid substrate 32 is bonded to one surface of the flexible substrate 30 to form an image sensor connection portion 34. In the example, as in the example shown in FIG. 5, for example, a functional component such as a heat radiating sheet that radiates heat generated in the image sensor 11, a drive circuit for the image sensor 11, or the like in the space immediately below the image sensor 11. It is possible to mount a component 33 such as an electronic component constituting the signal processing circuit.

  Further, as shown in FIG. 10, a rigid substrate 32 is bonded to one side of the flexible substrate 30 to form a circuit board connection portion 31, and a rigid substrate 32 is bonded to both sides of the flexible substrate 30 to form an image sensor connection portion 34. In the example, as in the example shown in FIG. 7, a functional component such as a heat radiating sheet that dissipates heat generated in the circuit board portion 13, or the imaging element 11, in a space immediately below the circuit board portion 13. It is possible to mount a component 33 such as an electronic component constituting the drive circuit or signal processing circuit.

  Next, taking the imaging device 10 shown in FIG. 2 as an example, a manufacturing method of the imaging device 10 and a modified example of the imaging device 10 shown in FIGS. 4 to 11 will be described.

  FIG. 12 shows an example of a method for manufacturing the imaging device 10.

  First, the image sensor 11 and the circuit board part 13 are mounted on the connection board part 14, respectively. In the imaging apparatus 10, a part 13 a of the circuit board unit 13 that is superimposed on the optical element 21 provided adjacent to the imaging element 11 is a module M in which the imaging element 11 and the circuit board unit 13 are respectively mounted on the connection board unit 14. And arranged above the image sensor 11 (FIG. 12A).

  As described above, the section 14a between the image pickup device 11 and the circuit board portion 13 in the connecting board portion 14 is flexible, and the flexible section 14a is bent so that a part 13a of the circuit board portion 13 is the image pickup device. 11 is retreated from above (FIG. 12B).

  Subsequently, the objective optical system 12 including the optical element 21 and the imaging element 11 are aligned, the objective optical system 12 is moved in the normal direction of the image receiving surface of the imaging element 11, and the circuit board unit 13 is retracted to be exposed. The emission surface 21c of the optical element 21 is bonded to the cover glass of the image pickup element 11 (FIG. 12C).

  In the alignment of the objective optical system 12 including the optical element 21 and the image sensor 11, the image sensor 11 and the circuit board unit 13 including the drive circuit and the signal processing circuit of the image sensor 11 are already mounted on the connection substrate part 14. Imaging is possible. Therefore, for example, the objective optical system 12 and the image sensor 11 can be aligned while confirming an image obtained by imaging an alignment chart or the like, whereby the objective optical system 12 and the image sensor 11 can be aligned. Can be aligned with high accuracy.

  Further, since the optical element 21 is moved in the normal direction of the image receiving surface of the image sensor 11, that is, in the normal direction of the output surface 21c, the adhesive provided on the cover glass of the output surface 21c or the image sensor 11 is It is spread between the exit surface 21c and the cover glass of the image sensor 11 without being cut. Thereby, the adhesion failure of the output surface 21c and the cover glass of the image pick-up element 11 can be suppressed.

  Finally, the section 14a between the imaging device 11 and the circuit board part 13 in the connection board part 14 is returned to the original state. Thereby, a part 13a of the circuit board part 13 is overlaid on the optical element 21 on the side opposite to the imaging element 11 (FIG. 12D).

  As described above, the rigid circuit board portion 13 and the imaging element 11 in which a part 13 a is superimposed on the optical element 21 provided adjacent to the imaging element 11 in the imaging device 10 and the imaging element 11 are mounted on the connection board portion 14 in advance. When the objective optical system 12 including the optical element 21 is assembled, the section 14a between the imaging element 11 and the circuit board part 13 in the connection board part 14 only needs to be bent and returned to the original state. The manufacturing process of the imaging device 10 can be made efficient.

  Note that the method for manufacturing the imaging device 10 can also be applied to modifications of the imaging device 10 shown in FIGS. 4 to 11.

  As described above, the following items are disclosed in this specification.

(1) An incident optical path including an imaging element and an optical element adjacent to the imaging element and extending in a direction intersecting with the normal direction of the image receiving surface of the imaging element is bent in the normal direction by the optical element. An objective optical system, a rigid circuit board portion that is partly disposed in the normal direction and on the opposite side of the imaging element and overlapping the optical element, and the imaging element and the circuit board portion are connected to each other. An imaging device, wherein at least a portion of the connection substrate portion between the imaging element and the circuit board portion is flexible.
(2) The connecting board part includes a flexible board that forms the flexible section, and the flexible board is provided with a rigid circuit board connecting part, and the circuit board part is connected to the circuit board. The imaging device according to (1), wherein the imaging device is stacked on a portion and connected to the connection substrate portion.
(3) The circuit board connecting portion has a pair of rigid boards integrated with the flexible board with the flexible board sandwiched from both sides, and the imaging element is mounted on one surface of the flexible board. Or mounted on a rigid board that is provided on one surface of the flexible board and integrated with the flexible board, and in the other side of the flexible board, the component is in a region opposite to the imaging element. The imaging apparatus according to (2) above, in which
(4) The imaging device according to (2) or (3), wherein the thermal conductivity of the circuit board connecting portion is higher than the thermal conductivity of the flexible substrate.
(5) The connecting substrate portion includes a flexible substrate that forms the flexible section, and the flexible substrate is provided with a rigid image sensor connection portion on which the image sensor is mounted. Imaging device.
(6) The imaging element connecting portion includes a pair of rigid substrates integrated with the flexible substrate with the flexible substrate sandwiched from both sides, and the circuit substrate portion is provided on one surface of the flexible substrate. Laminated and connected to the connecting board part, or laminated on a rigid board provided on one surface of the flexible board and integrated with the flexible board and connected to the connecting board part, and the flexible board The imaging device according to (5), wherein a component is mounted in a region opposite to the circuit board portion on the other surface of the substrate.
(7) An endoscope apparatus in which any one of the imaging apparatuses (1) to (6) is mounted on a distal end portion of an endoscope that is inserted into a subject.
(8) An image pickup device and a rigid circuit board portion that is partially overlapped with the image pickup device in a normal direction of an image receiving surface of the image pickup device is between the image pickup device and the circuit board portion. Imaging the part of the circuit board part that overlaps the imaging element by bending the section of the connection board part of the module connected by the connection board part flexibly configured in at least a part of The objective optical system including an optical element that is retracted from above the element and bends the incident optical path extending in the direction intersecting the normal direction of the image receiving surface of the image sensor in the normal direction is moved in the normal direction The optical element is provided adjacent to the imaging element, the bent section of the connecting board part is restored, and a part of the circuit board part overlapping the imaging element is placed in the normal direction with the imaging element. Is the other side with the above optics A method of manufacturing an imaging device that is arranged over an element.
(9) The circuit board unit generates image data by processing an output signal of the image sensor, and uses the image data generated by the circuit board unit, and the optical element and the image sensor. (8) The manufacturing method of the imaging device according to (8).
(10) The manufacturing method of the imaging device according to (8) or (9), wherein facing surfaces of the optical element and the imaging element are bonded to each other.

DESCRIPTION OF SYMBOLS 1 Endoscope apparatus 2 Insertion part 3 Operation part 4 Universal code 10 Imaging device 11 Imaging element 12 Objective optical system 13 Circuit board part 14 Connection board part 15 Wiring group 20 Lens group 21 Optical element 21a Incident surface 21b Reflective surface 21c Outgoing surface 22 Rigid board 30 Flexible board 31 Circuit board connection part 32 Rigid board 33 Component 34 Image sensor connection part A Optical axis M Module N Normal line

The present invention has been made in view of the above circumstances, and its object is to provide a manufacturing method and the endoscopic apparatus of the efficiency possible imaging apparatus and an imaging apparatus manufacturing process.

An imaging apparatus according to one embodiment of the present invention includes an imaging element and an optical element provided adjacent to the imaging element, and an incident optical path extending in a direction intersecting a normal direction of an image receiving surface of the imaging element is defined by the optical element. An objective optical system that bends in the normal direction , a rigid circuit board that is arranged behind the optical element in the incident direction, and a connecting board that connects the imaging element and the circuit board. , And at least part of the section between the imaging element and the circuit board part in the connection board part is flexible.
In the endoscope apparatus according to one aspect of the present invention, the imaging apparatus is mounted on an endoscope distal end portion that is inserted into a subject.
According to another aspect of the present invention, there is provided a method for manufacturing an imaging device, wherein an imaging device and an incident optical path that is adjacent to the imaging device and extends in a direction intersecting a normal direction of an image receiving surface of the imaging device are in the normal direction. A rigid circuit board portion disposed behind the optical element to be bent in the incident direction by a connecting board portion configured to be flexible in at least a section between the imaging element and the circuit board portion. by bending the section of the connection substrate portion connected module, the circuit board unit is retracted from above the image sensor, and an objective optical system including the optical element is moved in the normal direction, The optical element is disposed adjacent to the imaging element, the bent section of the connecting board portion is restored, and the circuit board is disposed behind the optical element .

According to the present invention, it is possible to provide a manufacturing process manufacturing method efficiency possible imaging apparatus and an imaging apparatus, and an endoscope apparatus.

In the illustrated example, the circuit board unit 13 includes a plurality of rigid boards 22 on which electronic components constituting a driving circuit and a signal processing circuit are mounted, and these rigid boards 22 are normal to the image receiving surface of the image sensor 11. They are stacked in the direction. The rigid substrate 22 is extended to the optical element 21 side, and each end of the rigid substrate 22 overlaps the optical element 21 on the opposite side of the imaging element 11 along the reflective surface 21b of the optical element 21. It has been. According to such a configuration, the space behind the optical element 21 can be effectively utilized, the imaging device 10 can be downsized, and the mounting area of the electronic components on the circuit board unit 13 can be increased.

Claims (10)

An image sensor;
An objective optical system including an optical element provided adjacent to the image sensor, and bending an incident optical path extending in a direction intersecting a normal direction of an image receiving surface of the image sensor in the normal direction by the optical element;
A rigid circuit board portion that is partially overlapped with the optical element on the side opposite to the imaging element in the normal direction;
A connecting substrate portion connecting the image sensor and the circuit substrate portion;
With
An imaging apparatus in which at least a part of the connection substrate portion between the imaging element and the circuit board portion is flexible. The connecting substrate portion has a flexible substrate that forms the flexible section,
The flexible board is provided with a rigid circuit board connecting portion,
The imaging device according to claim 1, wherein the circuit board unit is stacked on the circuit board connection unit and connected to the connection substrate unit. The circuit board connecting portion has a pair of rigid boards integrated with the flexible board with the flexible board sandwiched from both sides,
The imaging element is mounted on one surface of the flexible substrate, or mounted on a rigid substrate that is provided on one surface of the flexible substrate and integrated with the flexible substrate,
The imaging apparatus according to claim 2, wherein a component is mounted in a region opposite to the imaging element on the other surface of the flexible substrate.   The imaging device according to claim 2, wherein a thermal conductivity of the circuit board connecting portion is higher than a thermal conductivity of the flexible substrate. The connecting substrate portion has a flexible substrate that forms the flexible section,
The imaging apparatus according to claim 1, wherein the flexible substrate is provided with a rigid imaging element connection portion on which the imaging element is mounted. The imaging element connecting portion has a pair of rigid substrates integrated with the flexible substrate with the flexible substrate sandwiched from both sides,
The circuit board portion is laminated on one surface of the flexible substrate and connected to the connection substrate portion, or is laminated on a rigid substrate provided on one surface of the flexible substrate and integrated with the flexible substrate. Being connected to the connecting board part,
The imaging device according to claim 5, wherein a component is mounted in a region opposite to the circuit board portion on the other surface of the flexible substrate.   An endoscope apparatus in which the imaging apparatus according to any one of claims 1 to 6 is mounted on a distal end portion of an endoscope that is inserted into a subject. At least one of the imaging element and a rigid circuit board portion, part of which is disposed so as to overlap the imaging element in the normal direction of the image receiving surface of the imaging element, between the imaging element and the circuit board portion. A portion of the circuit board portion that overlaps the image pickup device is bent above the image pickup device by bending the section of the connection substrate portion of the module connected by the connection substrate portion that is configured flexibly in the section of the portion. Evacuate from
An objective optical system including an optical element that bends an incident optical path extending in a direction intersecting with a normal direction of an image receiving surface of the image sensor in the normal direction is moved in the normal direction, and the optical element is moved to the image sensor. Next to
The bent section of the connecting board portion is restored, and a part of the circuit board portion that overlaps the imaging element is arranged to overlap the optical element in the normal direction on the side opposite to the imaging element. Manufacturing method of imaging apparatus. The circuit board unit generates image data by processing an output signal of the image sensor,
The method for manufacturing an image pickup apparatus according to claim 8, wherein the optical element and the image pickup element are aligned using image data generated by the circuit board unit.   The manufacturing method of the imaging device according to claim 8 or 9, wherein opposing surfaces of the optical element and the imaging element are bonded to each other.

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