JP2007199578A - Aperture adjustment device and imaging device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To stabilize the position of a drive member to a base, regardless of the operating positions. <P>SOLUTION: The aperture adjustment device 1 includes a plurality of diaphragm vanes 50 that can be displaced relative to an aperture 11a for light transmission; a base member 10; and a drive member 40 rotatably supported on the base member, used to change the size of the aperture by displacing the plurality of diaphragm vanes relative to the aperture by rotating. The aperture adjustment device is provided with a pressing member 30 for pressing the restricting part 11c of a truncated conical shape, which restricts the rotation center of the drive member formed on the base member. The pressing member abuts the drive member against part of the restricting part, thereby preventing mechanical backlashes between the base member and the drive member. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a novel aperture adjustment device and imaging device. More specifically, the present invention relates to a technique for improving the accuracy of opening size adjustment in an apparatus for adjusting the opening size.

  In imaging devices such as film cameras, digital cameras, and digital video cameras, multiple diaphragm blades move along a plane perpendicular to the optical axis of the imaging optical system as an aperture mechanism that adjusts the light incident on the imaging optical system. It is known to change the size of the aperture (the aperture through which light is transmitted).

  In such a diaphragm mechanism, as shown in FIGS. 11 and 12, a base b having a circular hole a is provided, and a plurality of diaphragm blades c (only one is shown in FIG. 11) is centered on the circular hole a. The rotation of the diaphragm blade c is arranged on a drive member e which is arranged and supported by the base b in a state where one end d can be rotated and which can rotate with respect to the base b by transmitting the rotation of a motor (not shown). Guide pin f is formed, and the guide pin is slidably engaged with a cam groove g formed on the diaphragm blade c. When the drive member e is rotated by a motor, the guide pin f is interlocked. The aperture blade c rotates along the cam groove g, and the size of the aperture is adjusted by the rotation of the aperture blade c.

  In the above-described diaphragm mechanism, in order to make the drive member e rotatable with respect to the base b, a clearance h is provided between the drive member e and the base b in the optical axis direction and the radial direction to reduce the rotation load. It is necessary to reduce.

  However, the clearance h reduces the load of rotation, but the clearance changes the position of the drive member e (especially in the direction of gravity) just by changing the posture, and the drive member e Since the diaphragm blades c are connected via the guide pins f and the cam grooves g, the diaphragm blades c move in conjunction with the movement of the driving member, resulting in a change in aperture diameter, that is, a change in light quantity. End up. Further, depending on the operating posture, the posture may be stabilized by the dead weight of the driving member e, but the quality of accuracy changes depending on the change of the operating posture, and stable aperture accuracy is not achieved.

  In Patent Document 1, an intermediate gear is interposed between an output shaft rotated by a motor and a drive member, and mechanical play between the output gear and the drive member is eliminated by energizing the intermediate gear. The invention is shown.

JP 2003-121901 A

  By the way, in the invention disclosed in Patent Document 1, backlash between the output gear, the intermediate gear, and the driving member can be eliminated, but the rattling of the driving member due to the posture change cannot be eliminated. Absent. That is, the drive member is pressed only in one direction by the force urged by the intermediate gear. Therefore, if the direction in which the urging force acts is a gravitational direction or an antigravity direction, the driving member is stabilized in posture, but if the posture is changed and the gravitational direction crosses the urging force acting direction, The member moves in the direction of gravity by the clearance between the drive member and the base, and the diaphragm blades move to change the diaphragm diameter.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to make the posture of the drive member relative to the base stable regardless of the operation posture.

  An aperture adjusting device according to an embodiment of the present invention is supported by a plurality of diaphragm blades that can be relatively displaced with respect to an opening, a base member, and a base member that is rotatable with respect to the base member. And a drive member that changes the size of the opening by relative displacement with respect to the opening, and the drive member is formed on the base member and restricts the rotation center of the drive member, and the drive member is biased to the restriction portion. An urging member is provided.

  An imaging apparatus according to an embodiment of the present invention includes an imaging optical system, an imaging element that converts an optical image formed by the imaging optical system into an electrical signal, and the imaging element via the imaging optical system. An aperture adjustment device that adjusts the amount of light that reaches the aperture adjustment device, the aperture adjustment device is supported by a plurality of diaphragm blades that can be displaced relative to the aperture, a base member, and the base member so as to be rotatable; A driving member that changes the size of the aperture by rotating the plurality of diaphragm blades relative to the aperture by rotation, and a regulating portion that is formed on the base member and regulates the center of rotation of the driving member; An urging member that urges the driving member toward the restricting portion is provided.

  In the present invention, the posture of the drive member relative to the base member can be stable regardless of the posture.

  The best mode for carrying out the aperture adjustment device and the imaging device of the present invention will be described below with reference to the drawings.

  1 to 4 show a first embodiment of the opening adjusting device of the present invention.

  The opening adjusting device 1 includes a base member 10.

  The base member 10 has a substantially disc-shaped opening adjusting portion incorporating portion 11 and a drive portion incorporating portion 12 integrally connected so as to protrude from the outer edge of the opening adjusting portion incorporating portion 11. A circular light-transmitting opening 11a is formed at the center of the opening adjusting portion incorporating portion 11, and a low peripheral wall 11b is formed at the outer peripheral portion of the front surface. The peripheral wall 11b is formed in a range excluding a portion where the driving unit incorporating portion 12 is continuously provided.

  An annular base portion 11c is formed at a position surrounding the transparent opening 11a on the front surface, and a sliding groove 11d extending in a ring shape is formed between the base portion 11c and the peripheral wall 11b. Six guide pins 11e are formed at substantially equal intervals at a position near the outer periphery of the base portion 11c.

  The front surface of the drive unit built-in portion 12 of the base member 10 is located in substantially the same plane as the front end of the peripheral wall 11b, and moves to the side of the drive unit built-in portion 12 that faces the sliding groove 11d. A concave portion 12a is formed, and the bottom surface of the concave portion 12a for movement is located in the same plane as the bottom surface of the sliding groove 11d. Further, the drive assembly portion 12 is formed with a gear arrangement hole 12b penetrating in the front-rear direction, and a part of the gear arrangement hole 12b is opened to the movement recess 11a side.

  A driving motor, for example, a stepping motor 20, is fixed to the rear surface of the driving unit incorporating unit 12, and a driving gear 22 attached to the output shaft 21 of the motor 20 is arranged in the gear arrangement hole 12b. A part of the drive gear 22 protrudes toward the moving recess 12a.

  Two urging members 30 are arranged on the inner side of the peripheral wall 11 b of the opening adjusting portion incorporating portion 11 of the base member 10. As shown in FIG. 4, the urging member 30 is formed by bending a leaf spring material into a substantially V shape, and one V-shaped piece 31, that is, a fixed piece is fixed to the inner wall surface of the peripheral wall 11b (see FIG. 4). 3), the other piece 32, that is, the bullet piece, is projected to the sliding groove 11d side. In addition, the bullet piece 32 is bent into a mountain shape at an almost intermediate portion so that the mountain-shaped top portion 32a is located farthest from the peripheral wall 11b. Then, as shown in FIG. 2, the position of the top portion 32a of the resilient piece 32 of one biasing member 30 is A, the position of the top portion 32a of the resilient piece 32 of the other biasing member is B, and the trapezoidal portion. When the center of the outer peripheral surface forming the circle 11c is O, the positions A and B are on the opposite side of the drive gear 22 across the center O, and the positions A and B are the positions of the drive gear 22. It is at a position sandwiching a line L extending between the center and the center O. Further, the positions A, B, and O are arranged so that the angle AOB is less than 180 degrees.

  A drive member 40 having a substantially ring shape is rotatably arranged on the base member 10. The drive member 40 is formed by integrally forming a rotating portion 41 having a substantially ring shape and a sector gear portion 42 protruding radially from the outer peripheral edge of the rotating portion within a predetermined angle range, and the outer peripheral edge of the sector gear portion 42. A plurality of gear teeth 42a are formed. The rotating part 41 is positioned in the sliding groove 11d so as to be fitted on the base part 11c of the base member 10, and the inner diameter of the central hole 41a of the rotating part 41 is slightly larger than the outer diameter of the base part 11c. There is a slight clearance between them. Accordingly, the drive member 40 is rotated about the base portion 11 c of the base member 10 as the rotation axis, and therefore the center O of the outer peripheral surface of the base portion 11 c is the rotation center of the drive member 40. That is, the base portion 11 c serves as a restricting portion that restricts the rotation center of the driving member 40.

  With the rotating portion 41 of the driving member 40 arranged in the sliding groove 11d of the base member 10 as described above, the sector gear portion 42 is positioned in the moving recess 12a, and its gear teeth 42a are in the driving state. The gear 22 is engaged.

  Then, six fulcrum pins 41c are protruded from the front surface of the rotating portion 41 of the driving member 40 at a position near the outer periphery at regular intervals in the circumferential direction.

  As described above, when the driving member 40 is rotatably disposed on the base member 10, the top portion 32 a of the elastic piece 32 of the biasing member 30 is in elastic contact with the outer peripheral surface 41 b of the rotating portion 41 of the driving member 40. As a result, the rotating portion 40 is urged toward the driving gear 22, and the center hole 41 a of the rotating portion 41 of the driving member 40 and the base member 10 are placed on the side where the urging member 30 is elastically contacted. The outer peripheral surface of the shaped portion 11c comes into contact with no clearance.

  Six diaphragm blades 50 are disposed between the lid 60 and the driving member 40. In addition, since the shape and effect | action of six diaphragm blades 50 are the same, only one sheet is shown in FIG. 1, and illustration of the diaphragm blade 50 is abbreviate | omitted in another drawing. The aperture blade 50 has a supported hole 51 at one end, and a cam slit 52 is formed from a position near one end to a position near the other end. In addition, an aperture forming edge 53 is formed on one side edge. In the diaphragm blade 50, the fulcrum pin 41c of the driving member 40 is inserted into the supported hole 51, and the guide pin 11e of the base member is slidably engaged with the cam slit 52. Therefore, when the drive member 40 rotates with respect to the base member 10, the position of the guide pin 11e engaged with the cam slit 52 changes, and thereby the diaphragm blade 50 rotates around the fulcrum pin 41c of the drive member 40. Move. That is, the diaphragm blade 50 is displaced relative to the opening 11a of the base member. By arranging the six diaphragm blades 50 as described above, the diaphragm hole is formed in the range of the light transmitting opening 11a of the base member 10 by the diaphragm hole forming edge 53, and the above-described diaphragm hole is formed. As described above, when the diaphragm blade 50 is relatively displaced with respect to the opening 11a, the size of the diaphragm hole is changed, and accordingly, the amount of light transmitted through the light transmitting opening 11a is changed.

  As described above, after the drive member 40, the diaphragm blade 50 biasing member 30 and the like are incorporated in the base member 10, the front surface of the base member 10 is covered with the lid body 60, and the opening adjusting device 1 is completed.

  In the opening adjusting device 1 described above, since the driving member 40 is always urged toward the driving gear 22 by the urging member 30, the posture of the opening adjusting device 10, particularly the light transmitting opening. Even if the driving member 40 changes its posture in the rotational direction with the opening surface of 11a along the vertical plane, the driving member 40 is not shifted in the direction of gravity by its own weight, and is set immediately before the posture change. The aperture diameter that has been used does not change.

  In the above embodiment, the driving member 40 is constantly urged by the urging member 30 to the restricting portion 11e that is formed on the base member 10 and restricts the rotation center of the driving member 40, so that the operating posture is changed. However, the driving member 40 does not move due to gravity or the like, and the accuracy of the selected opening does not go wrong.

  Furthermore, in the said embodiment, since the urging | biasing member is provided in two places, the position of a drive member is stabilized further.

  Further, in the above embodiment, when the urging members are provided at two locations, the two positions urged by the urging member of the driving member are A and B, respectively, and the rotation center of the driving member is O, Since the angle AOB is less than 180 degrees, the position of the driving member is further stabilized.

  FIG. 5 shows a modification of the position where the urging member is installed.

  In the above-described embodiment, the urging member is installed between the inner side of the peripheral wall 11b of the base member 10 and the outer peripheral surface 41b of the drive member 40. However, in this modification, the center hole 41a of the drive member 40 and the base member are arranged. It was installed between 10 platform parts 11c.

  That is, a notch recess 41d is formed on the side surface of the center hole 41a of the drive member 40, and the fixed piece 31 of the biasing member 30 is positioned in the notch recess 41d. As a result, the top portion 32a of the elastic piece 32 of the urging member 30 comes into elastic contact with the outer peripheral surface of the base portion 11c of the base member 10, whereby the drive member 40 is trapezoidal at the location where the urging member 30 is provided. It is urged | biased so that it may distance from the outer peripheral surface of the part 11c.

  Even in this modified example, the same effect as the aperture adjusting device 1 is obtained.

  6 and 7 show a modification of the urging member.

  The urging member 30 shown above is formed by bending a leaf spring. Here, the urging member formed of a material having rubber-like elasticity is shown. The biasing member 30A is mainly made of a material having rubber-like elasticity, for example, natural rubber, synthetic rubber, urethane foam or the like. Here, what uses a flexible urethane foam is shown. A flexible urethane foam in the form of a thin plate is prepared as the base 33, and the surface of the base 33 is coated with a material having a low frictional resistance, for example, a fluororesin, to form the sliding layer 34.

  At the urging member arrangement position of the base member 10, fitting notches 11 f are formed on the inner peripheral surface of the peripheral wall 11 b with an interval shorter than the length of the urging member 30 </ b> A. Then, the urging member 30A is curved in a bow shape so that the sliding layer 34 faces the outer peripheral surface 41b of the driving member 40 and the center protrudes toward the outer peripheral surface 41b of the driving member 40, and both end portions 35 are formed as bases. It fits in the fitting notch 11f formed in the inner peripheral surface of the peripheral wall 11b of the member 10, and the said both ends 35 are fixed to the peripheral wall 11b by appropriate means, such as adhesion | attachment, as needed. As a result, the urging member 30A is attached to the peripheral wall 11b of the base member 10 while being bent like a bow, and the sliding layer 34 at the center is in elastic contact with the outer peripheral surface 41b of the drive member 40. Therefore, since the driving member 40 is urged by the urging member 30A, if the urging member 30A is used instead of the urging member 30, the same effect as described above can be obtained. Of course, the urging member 30A can be installed between the driving member 40 and the base portion 11c of the base member 10 as in the case of FIG.

  In the above-described example, the urging member is formed of a leaf spring material or a rubber-like elastic material. However, a member using a wire spring or a torsion spring can also be applied. Further, the installation position of the urging member is not limited to the above-described position, and the urging member may be fixed to either the base member or the driving member, and may not be fixed depending on the case. . Moreover, although the urging | biasing member was shown in two places, it is not limited to two places.

  In the above embodiment, the urging member is formed of any one of a leaf spring, a wire spring, a torsion spring, and a rubber-like elastic body, so that the urging member can be easily installed.

  FIG. 8 shows a second embodiment of the opening adjusting device of the present invention.

  In the opening adjustment apparatus 1A according to the second embodiment, the portion where the driving member 40 is brought into contact with the base member 10 by the biasing member is different from the opening adjustment apparatus 1 according to the first embodiment, and other points. Are almost the same. Accordingly, the same parts as those in the first embodiment are not shown, or the same reference numerals as those in the first embodiment are given, and the description is omitted.

  Two protrusions 11g are formed on the outer peripheral surface of the base portion 11c of the base member 10 at intervals in the circumferential direction. A single urging member 30 is provided on the inner peripheral surface of the peripheral wall 11b of the base member 10 so that the inner surface of the center hole 41a of the drive member 40 abuts against the protrusion 11g. For this reason, the drive member 40 rotates in contact with the protrusion 11g, and the protrusion 11g functions as a restricting portion that restricts the rotation center of the drive member 40.

  The urging direction P by the urging member 30 is within the range of the angle COD when the positions of the two protrusions 11g are C and D and the rotation center of the driving member 40 is O, respectively. This ensures that the inner surface of the center hole 41a of the drive member 40 is elastically contacted with the two protrusions 11g. Accordingly, the position of the drive member 40 is always stable, and the position of the drive member 40 does not move due to its own weight or the like even if the posture of the opening adjustment device 1A is changed.

  In the above embodiment, the base member has two protrusions, the driving member is brought into contact with the two protrusions by one biasing member, and the biasing direction by the biasing member is the two protrusions. When the positions of the portions are C and D and the rotation center of the drive member is O, the position of the drive member is further stabilized because it is within the range of the angle COD.

  FIG. 9 shows a modification of the urging member. This urging member makes a non-contact state between the urging member and the driving member.

  The urging member 30 </ b> B includes a magnet 36 that is embedded and fixed to the outer peripheral surface 41 b of the drive member 40 and a magnetic body 37 that is fixed to be embedded in the inner peripheral surface of the peripheral wall 11 b of the base member 10. Therefore, the attractive force generated between the magnet 36 and the magnetic body 37 acts as an urging force, and the driving member 40 to which the magnet 36 is fixed has an inner surface of the center hole 41a on the outer peripheral surface of the base portion 11c of the base member 10. It is urged | biased by the said attraction | suction force so that it may contact | abut to the protrusion 11g formed in this.

  The base member 10 may be provided with a magnet, and the drive member 40 may be provided with a magnetic body. Moreover, when using a magnet, it can replace with the magnetic body 37 and a magnet can also be used. In this case, if the polarities of the two magnets facing each other are different, an attractive force is generated between them, and if the polarities are the same, a repulsive force is generated.

  In the above embodiment, the urging member is a magnet or magnetic body provided on one of the base member and the drive member and a magnet or magnetic body provided on the other (except when both are provided with a magnetic body). Since it is comprised, it can be made a non-contact state between a drive member and a biasing member.

  FIG. 10 shows an embodiment of the imaging apparatus of the present invention.

  The imaging apparatus 100 includes an imaging optical system 120, an imaging element 130 that converts an optical image formed by the imaging optical system 120 into an electrical signal, and light that reaches the imaging element 130 via the imaging optical system 120. An aperture adjusting device 1 or 1A for adjusting the amount of light is provided.

  The imaging optical system 120 includes a plurality of lenses and a variable aperture stop incorporated in the lens barrel 110, and the variable aperture stop is formed by the aperture blade 50 of the aperture adjusting device 1 or 1A.

  The imaging optical system 120 includes, in order from the object side to the image plane side, a first lens group G1 that is fixed in the optical axis direction x, a second lens group G2 that is movable in the optical axis direction and has a zooming function, and light. A third lens group G3 that is fixed in the axial direction, and a fourth lens group G4 that is movable in the optical axis direction and that corrects fluctuations in the image plane position accompanying the movement of the second lens group G2 and moves during focusing at a short distance. Are arranged as a zoom lens.

  The first lens group G1 is fixed to the front end portion of the lens barrel 110, and the third lens group G3 is fixed at a substantially intermediate position of the lens barrel 110.

  Between the first lens group G1 and the third lens group G3, the movable lens frame 111 is supported on the lens barrel 110 by the guide shafts 112a and 112b so as to be movable in the optical axis x direction. The lens group G2 is held. The lens barrel 110 supports a lead screw 113 that is rotated by a stepping motor (not shown), and a part 111 a of the movable lens frame 111 is engaged with the lead screw 113. Accordingly, when the lead screw 113 rotates, a portion 111a meshing with the lead screw 113 of the movable lens frame 111 is sent in the optical axis x direction, and accordingly, the movable lens frame 111 and the second lens group G2 supported by the movable lens frame 111 are supported. Is moved in the optical axis direction x.

  The movable lens frame 114 is supported by the lens barrel 110 so as to be movable in the optical axis x direction by guide shafts 115a and 115b at a position behind the third lens group G3, and the fourth lens group G4 is held by the movable lens frame 114. Has been. The lens barrel 110 supports a lead screw 116 that is rotated by a stepping motor (not shown), and a part 114 a of the movable lens frame 114 is engaged with the lead screw 116. Accordingly, when the lead screw 116 rotates, the portion 114a meshing with the lead screw 116 of the movable lens frame 114 is sent in the direction of the optical axis x, and accordingly, the movable lens frame 114 and the fourth lens group G4 supported thereby. Is moved in the optical axis direction x.

  The aperture adjusting device 1 or 1A is fixed to the lens barrel 110 immediately after the third lens group G3.

  A solid-state image sensor 130 such as a CCD (Charge Coupled Device) or CMOS (Complementary Metal-Oxide Semiconductor) is fixed to the rear end of the lens barrel 110, and an optical image formed by the imaging optical system 120 on the light receiving surface is obtained. It is designed to receive light.

  An image signal output from the solid-state imaging device 130 obtained by converting the optical image into an electrical signal is sent to the image processing unit 140, and predetermined processing is performed in the image processing unit 140. The image processing unit 140 sends information related to an image necessary for control or the like to the arithmetic processing unit 150, displays a photographed image on a viewfinder, a monitor, or the like, or outputs an image signal or the like on a recording medium according to a user operation instruction. Let me record. The arithmetic processing unit 150 including a microcomputer or the like sends a control command to the control unit 160, and from the control unit 160, a stepping motor for driving the second lens group G2, a stepping motor for driving the fourth lens group G4, and aperture adjustment A control signal is supplied to the drive motor 20 or the like of the device 1 or 1A, and thereby the above-described units are controlled.

  It should be noted that the specific shapes and structures of the respective parts in each of the above-described embodiments are merely examples of the implementation performed in carrying out the present invention, and the technical scope of the present invention is limited by these. It should not be interpreted in a general way.

FIG. 2 shows a first embodiment of the opening adjusting device of the present invention together with FIG. 2, and this figure is an exploded perspective view showing the whole. It is a front view of the principal part. It is a front view which expands and shows the part III enclosed with the dashed-two dotted line of FIG. It is an enlarged front view of a biasing member. It is a front view of the principal part which shows the modification which installed the biasing member in another position. A modification of the urging member is shown together with FIG. 7, and this figure is a front view of the main part. It is an expanded sectional view of a biasing member. It is a front view of the principal part which shows 2nd Embodiment of this invention opening adjustment apparatus. It is a front view of the principal part which shows the modification of a biasing member. It is sectional drawing which shows embodiment of this invention imaging device. It is a figure for demonstrating the conventional problem in an opening adjustment apparatus with FIG. 12, This figure is a front view which abbreviate | omits and shows a part. It is a front view of the principal part which shows a problem.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Opening adjustment apparatus, 10 ... Base member, 11a ... Translucent opening (opening), 11c ... Base part (regulation part), 30 ... Energizing member, 40 ... Driving member, 50 ... Diaphragm blade, 30A ... With Urging member, 11g ... projection (regulating part), 1A ... aperture adjustment device, 30B ... urging member, 36 ... magnet, 37 ... magnetic body, 100 ... imaging device, 120 ... imaging optical system, 130 ... solid-state imaging device ( Image sensor)

Claims (10)

A plurality of diaphragm blades that can be displaced relative to the opening, a base member, and a base member that are rotatably supported by the base member. In an aperture adjustment device comprising a drive member that changes
An opening adjusting device comprising: a restricting portion formed on the base member for restricting a rotation center of the drive member; and an urging member for urging the drive member toward the restricting portion. The opening adjusting device according to claim 1, wherein the urging member is provided at two locations. The angle AOB is less than 180 degrees when the two positions of the driving member biased by the biasing member are A and B and the rotation center of the driving member is O, respectively. The opening adjusting device according to claim 1. Two protrusions are formed on the base member, and the driving member is brought into contact with the two protrusions by one urging member,
The urging direction by the urging member is within a range of an angle COD when the positions of the two protrusions are C and D and the rotation center of the driving member is O, respectively. The opening adjusting device according to claim 1. The said urging member is formed by either a leaf | plate spring, a wire spring, a torsion spring, or a rubber-like elastic body. The Claim 1, Claim 2, Claim 3 or Claim 4 characterized by the above-mentioned. Opening adjustment device. The said urging member is comprised by the magnet provided in one of the base member and the drive member, and the magnetic body provided in the other. The Claim 1, Claim 2, Claim 3, or Claim 3 characterized by the above-mentioned. 4. The opening adjusting device according to 4. The opening adjustment according to claim 1, 2, 3, or 4, wherein the urging member is constituted by a magnet separately provided on both the base member and the driving member. apparatus. An imaging optical system, an imaging element that converts an optical image formed by the imaging optical system into an electrical signal, and an aperture adjustment device that adjusts the amount of light reaching the imaging element via the imaging optical system An imaging device comprising:
The aperture adjusting device is supported by a plurality of diaphragm blades that can be displaced relative to the opening, a base member, and the base member so as to be rotatable with respect to the opening. And a drive member that changes the size of the opening,
An image pickup apparatus comprising: a restricting portion formed on the base member for restricting a rotation center of the drive member; and an urging member for urging the drive member toward the restricting portion. The biasing member is provided at two locations,
The angle AOB is less than 180 degrees when the two positions of the driving member biased by the biasing member are A and B, respectively, and the rotation center of the driving member is O. The imaging device described in 1. Two protrusions are formed on the base member, and the driving member is brought into contact with the two protrusions by one urging member,
The urging direction by the urging member is within a range of an angle COD when the positions of the two protrusions are C and D and the rotation center of the driving member is O, respectively. The imaging device described in 1.

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