JP2009244718A - Barrier mechanism, lens device, and imaging apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To facilitate the mass production of a barrier mechanism in which high resistance properties with respect to external factors such as dust and vibration and the high positional accuracy of a barrier blade in a thrust direction are secured. <P>SOLUTION: The barrier mechanism is characterized in including: a pair of barrier blades 101 which are provided to be movable in a contact and separate direction and moved to be selectively positioned to a position where an optical path is opened and a position where the optical path is closed; and guide poles 107 which are provided in positions retreated from the optical path and engaged with the pair of barrier blades 101 so that they can be moved along the contact and separate direction. The movement positions of the barrier blades 101 are regulated by the guide poles 107, so that the barrier blades 101 are moved only in a plane crossing the optical axis. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a barrier mechanism, a lens apparatus, and an imaging apparatus that cover an objective lens of a camera at the time of non-imaging to protect the objective lens from external impacts and contamination.

  In a lens apparatus provided with an optical member such as a lens disposed on the optical axis, for example, a barrier blade provided so as to be rotatable in a direction crossing the optical path around a rotational axis provided at a position retracted from the optical path And a barrier mechanism that opens and closes the optical path by rotating the barrier blades.

  Conventionally, when the barrier blades are fully opened and when the barrier blades are fully closed, the barrier blade driving ring moves forward to press the barrier blades against the rear surface of the barrier protection cover (for example, see Patent Document 1 below) or closing. In this technique, a protrusion having an increased thickness is formed at the peripheral edge of the barrier sector that protects the lens of the camera, and the protection sector is provided in an area relatively thinner than the protrusion (see, for example, Patent Document 2 below). There was. Conventionally, there has been a technique in which a transparent plate that allows a light beam necessary for photographing to pass through the objective direction side of the barrier blade has been provided in order to prevent foreign matters such as dust from entering the barrier blade structure. .

JP-A-9-61887 JP 2007-121781 A

  However, in the conventional technology described above, the space for the barrier blades to rotate while suppressing the dimension in the optical axis direction is secured, so that the manufacturing accuracy of each component and the assembly accuracy of the components related to the barrier mechanism are strictly secured. Must-have. On the other hand, the mass productivity decreases as the required accuracy for manufacturing and assembling the parts for the barrier mechanism increases. That is, in the conventional technique, there is a problem that it is difficult to achieve both improvement in the dimensional accuracy in the thrust direction related to the operation of the barrier blades and improvement in mass productivity of the barrier mechanism.

  In addition, by widening the space for the barrier blades to rotate, it becomes possible to stably operate the barrier blades by preventing catching, but if the space for the barrier blades to rotate is widened During operation, the barrier blades are not stabilized, and the barrier blades are rampant, or the seams between the barrier blades in the closed state are shifted, resulting in a decrease in appearance.

  In addition, when the space for rotating the barrier blades is widened, foreign matters such as sand and dust are likely to enter the space, and there is a problem that the operation of the barrier blades is hindered by the entered foreign materials. The barrier mechanism is required to reduce the thickness of the entire barrier mechanism while ensuring the working space of the barrier blades without allowing foreign matter to enter, but the conventional technology requires a barrier that can satisfy all these requirements. There was a problem that it was difficult to realize the mechanism.

  Further, in the conventional technique in which a transparent plate that allows a light beam necessary for photographing to pass through the objective side of the barrier blade is provided, the F value that represents the brightness of the lens performance is lowered, and the lens has There was a problem that the original performance could not be used effectively.

  In order to eliminate the above-mentioned problems caused by the prior art, the present invention facilitates mass production of a barrier mechanism that ensures high resistance to external factors such as dust and vibration and high positional accuracy of barrier blades in the thrust direction. It is an object of the present invention to provide a barrier mechanism, a lens device, and an imaging device that can perform the above operation.

  In order to solve the above-described problems and achieve the object, the barrier mechanism according to the present invention is provided so as to be movable in a direction in which the barrier mechanism is in contact with or separated from each other in a plane intersecting the optical axis (hereinafter referred to as “contact and separation direction”) A pair of barrier blades that are selectively positioned at a position that opens or closes the optical path by moving, and a position that is retracted from the optical path, the pair of barrier blades along the contact / separation direction And a guide member that is movably engaged.

  According to the present invention, since the barrier blade moves only in the plane intersecting the optical axis by restricting the movement position of the barrier blade by the guide member, the movement of the barrier blade in the optical axis direction (thrust direction) is simplified. And the position of the barrier blades in the thrust direction can be stabilized.

  In addition, according to the present invention, the barrier blades can be moved reliably and with high accuracy without particularly managing the manufacturing accuracy of components for securing the space for the barrier blades to move and the assembly accuracy of these components. Can be made.

  Furthermore, according to the present invention, since it is not necessary to secure a space for the barrier blades to move, foreign matters such as dust are less likely to collect in the movement region of the barrier blades, and the foreign matters prevent the barrier blades from moving. In addition to suppressing the occurrence of foreign matter compared to the conventional barrier mechanism that pivots to open and close the barrier blade since the barrier blade moves linearly, it suppresses the malfunction of the barrier blade caused by the foreign matter. be able to.

  In the barrier mechanism according to the present invention, in the above invention, the guide member extends in a contact / separation direction of the pair of barrier blades at a position where the pair of barrier blades are engaged and retracted from the optical path. It is characterized by comprising a pole shape.

  According to this invention, by restricting the movement position of the barrier blade by the guide member having a pole shape, it is possible to prevent the movement of the barrier blade in the optical axis direction (blur of the barrier blade in the thrust direction) with a simple configuration. it can.

  The barrier mechanism according to the present invention is characterized in that, in the above invention, the guide member is engaged with each of the pair of barrier blades. According to this invention, by restricting the movement position of the pair of barrier blades by the same guide member, the pair of barrier blades in the closed position can be brought into contact with each other with a simple configuration.

  Moreover, the barrier mechanism according to the present invention is characterized in that, in the above-described invention, the guide member is engaged with both ends of the pair of barrier blades in the width direction. According to the present invention, the movement of the barrier blade in the optical axis direction (the blur of the barrier blade in the thrust direction) can be prevented with a simple configuration regardless of the diameter of the optical path.

  Further, the barrier mechanism according to the present invention is characterized in that, in the above-described invention, the barrier mechanism includes a biasing member that biases the pair of barrier blades in a direction in which the pair of barrier blades are in contact with each other or in a direction in which the pair is separated. According to the present invention, by biasing each barrier blade in a direction parallel to the moving direction (radial direction) of the barrier blade, the position of the barrier blade in the moving direction can be stabilized.

  Further, in the above invention, the barrier mechanism according to the present invention is connected to the biasing member that biases the pair of barrier blades in any one of the contact and separation directions, and the pair of barrier blades, A power transmission piece slidable in the contact / separation direction and abutting on and separating the barrier blade through the power transmission piece by contacting the power transmission piece and displacing the power transmission piece in the optical axis direction And an actuating piece that moves in the direction.

  According to the present invention, for example, by using a mechanism that enables the lens barrel in the lens apparatus to be deformed into a retracted state and a extended state, the operating piece is moved by the driving force when the optical path length is expanded and contracted to open and close the barrier blades. Can be done. This eliminates the need for a rotating ring for rotating the barrier blades provided in a conventional barrier device having a structure for rotating the barrier blades.

  In the above invention, the barrier mechanism according to the present invention is displaceable with respect to the optical axis direction and a biasing member that biases the pair of barrier blades in a direction in which the pair of barrier blades are in contact with each other. And an operation piece having a tapered shape toward the objective side and the pair of barrier blades, and the pair of barrier blades are positioned relative to the operation piece when the pair of barrier blades are positioned at the closing position. A pair of power transmission pieces that constitute a working piece receiving portion that allows insertion of the working piece by displacing, and the working piece comes into contact with the working piece receiving portion from the eyepiece side. The barrier blades are positioned to be opened by moving toward the objective side in the optical axis direction while pushing the gap between the power transmission pieces, and move toward the eyepiece side in the optical axis direction. Wherein the positioning in a position closing the barrier blades by.

  According to the present invention, a barrier is provided by moving a working piece by a driving force when expanding and contracting an optical path length by using a mechanism that a lens apparatus generally has as a structure for expanding and contracting an optical path length in a zoom lens apparatus and the like. The blades can be opened and closed. This eliminates the need for a rotating ring for rotating the barrier blades provided in a conventional barrier device having a structure for rotating the barrier blades.

  The barrier mechanism according to the present invention is characterized in that, in the above invention, the pair of power transmission pieces are not in contact with each other when the barrier blades are positioned at the closing position. According to the present invention, the barrier blades in the closed position are brought into contact without being affected by the interference of other members, thereby preventing a gap from being generated between the barrier blades in the closed position (thinning). can do.

  The lens device according to the present invention includes a lens provided on an optical path, and the barrier mechanism including a pair of barrier blades selectively positioned at a position where the optical path of the lens is opened or a position where the optical path is closed. , Provided.

  According to the present invention, it is possible to prevent foreign matters such as dust from entering, to prevent the malfunction of the barrier blades due to the entry of foreign matter, and to reliably protect the lens.

  According to another aspect of the present invention, there is provided an imaging apparatus comprising: an imaging element; and the lens apparatus that forms an optical path through which external light is incident on the imaging element. According to the present invention, the image pickup apparatus can be reduced in size by using a thin lens, and the image quality can be prevented from being deteriorated due to contamination of foreign matters by protecting the lens against external factors such as dust and vibration. Therefore, it is possible to capture a high quality image.

  According to the barrier mechanism, the lens device, and the imaging device according to the present invention, it is possible to improve the positional accuracy of the barrier blades in the thrust direction without particularly strictly controlling the manufacturing accuracy and assembly accuracy of the components constituting the barrier mechanism. There is an effect that foreign matter such as dust can be prevented from entering. Thereby, it is possible to facilitate mass production of a barrier mechanism that ensures high resistance to external factors such as dust and vibration and high positional accuracy of the barrier blades in the thrust direction.

  Exemplary embodiments of a barrier mechanism, a lens apparatus, and an imaging apparatus according to the present invention will be explained below in detail with reference to the accompanying drawings.

  First, a barrier mechanism, a lens apparatus, and an imaging apparatus according to embodiments of the present invention will be described. 1, 2, 3 and 4 are explanatory views showing a barrier mechanism according to an embodiment of the present invention. 1 and 2 show a perspective state of the barrier mechanism according to the embodiment of the present invention. 3 and FIG. 4, the AA cross section in FIG. 1 and FIG. 2 of the barrier mechanism of this Embodiment is shown, respectively. 1 and 3 show the barrier mechanism in the open state, and FIGS. 2 and 4 show the barrier mechanism in the closed state.

  1, 2, 3, and 4, a barrier mechanism 100 according to an embodiment of the present invention includes two barrier blades 101. The two barrier blades 101 are arranged to face each other with the optical axis in between in a plane intersecting the optical axis. Further, the two barrier blades 101 are provided so as to be movable in a direction in which they come in contact with each other (hereinafter referred to as “contact / separation direction”) in a plane intersecting the optical axis. 1, 2, 3, and 4, the contact / separation direction is the vertical direction of the paper in FIGS. 1, 2, 3, and 4.

  The two barrier blades 101 are selectively positioned at a position where the optical path is opened (hereinafter referred to as “open position”) or a position where the optical path is closed (hereinafter referred to as “close position”) by moving in the contact / separation direction. The two barrier blades 101 have a substantially semicircular shape, and in a state of being positioned at the closed position, form a substantially disk shape by contacting each other.

  The two barrier blades 101 reciprocate in the contact / separation direction on the eyepiece side of the front frame 201 in the optical axis direction. The front frame 201 is a ring-shaped member, and covers the barrier blade 101 in the open position, other mechanical units provided in the lens device 200, or gaps between components. Accordingly, it is possible to improve the aesthetics of the barrier mechanism 100 and the lens device 200 and the imaging apparatus including the barrier mechanism 100.

  The front frame 201 is provided on the lens barrel 202. The lens barrel 202 has a substantially cylindrical shape with the optical axis direction as the axial direction, and holds one or more lenses (or lens groups) on the inner periphery. Description of one or more lenses provided on the inner periphery of the lens barrel 202 is omitted. The outer diameter of the front frame 201 is substantially the same as the inner diameter of the lens barrel 202, and the front frame 201 is attached by being fitted to the end of the lens barrel 202 on the objective side.

  The lens device 200 can be deformed into a retracted state where the optical path length is the shortest and an extended state where the optical path length is the longest. The lens device 200 changes the state of the lens device 200 into the retracted state and the extended state by using, for example, a cam mechanism. Since the mechanism for changing the state of the lens device 200 into the retracted state and the extended state is a known technique, the description thereof is omitted.

  The barrier mechanism 100 is in a closed state in which the barrier blade 101 is positioned in the closed position when the lens device 200 is in the retracted state, and in an open state in which the barrier blade 101 is positioned in the open position when the lens device 200 is in the extended state. Become. That is, the opening / closing of the barrier mechanism 100 is interlocked with a change in the state of the lens apparatus 200 (whether the retracted state or the extended state).

  The barrier blade 101 has the same shape regardless of the attachment position and the moving direction. Each of the two barrier blades 101 includes a connecting member 102. The connecting member 102 is provided at both ends of the two barrier blades 101 in a direction (hereinafter referred to as “width direction”) in a plane intersecting the optical axis and orthogonal to the contact / separation direction.

  FIG. 5 is a perspective view showing the barrier blade 101. In FIG. 5, the connecting member 102 includes a hole 501 that penetrates the connecting member 102 in the contact / separation direction. In this embodiment, the barrier mechanism 100 is configured using two identical barrier blades 101 regardless of the attachment position.

  The connecting member 102 includes a compression spring 103 that biases the two barrier blades 101 in a direction in which the two barrier blades 101 contact each other. One end of the compression spring 103 is engaged with a protrusion 104 provided on one connecting member 102, and the other end of the compression spring 103 is engaged with a protrusion 105 provided on the other connecting member 102. The compression spring 103 urges the two barrier blades 101 by urging the projections 104 and 105 in a direction in which the projections 104 and 105 supporting both ends of the compression spring 103 approach by the contraction force of the compression spring 103.

  In this embodiment, a biasing member is realized by the compression spring 103. The biasing member is not limited to the compression spring 103, and may be a biasing force in a direction in which the two barrier blades 101 are in contact with each other by a restoring force of an elastic material itself such as rubber. .

  The connecting member 102 includes a power transmission piece 106. The power transmission piece 106 protrudes parallel to the optical axis direction from the connecting portion toward the eyepiece side. The power transmission piece 106 contacts in the contact / separation direction when the two barrier blades 101 are located at the closed position. Each of the power transmission pieces 106 includes slope portions 203 at positions facing each other in the contact / separation direction. The power transmission piece 106 forms a working piece receiving portion 204 having a concave shape in the optical axis direction by the inclined surface portion 203 in a state of being in contact with each other. The operating piece receiving portion 204 is open toward the eyepiece side, and in this embodiment, an operating piece receiving portion is realized.

  The barrier mechanism 100 includes a guide pole 107. The guide pole 107 is provided at a position retracted from the optical path, and the pair of barrier blades 101 are engaged with the guide pole 107 so as to be movable along the contact / separation direction. One guide pole 107 is provided on each end of the two barrier blades 101 in the width direction.

  Each guide pole 107 is inserted into a hole 501 provided in the connecting member 102 facing in the contact / separation direction. The connecting member 102 can slide with respect to the guide pole 107 along the guide pole 107. That is, the connecting member 102 is slidable in the contact / separation direction. Thus, the two barrier blades 101 can be moved in the approaching / separating direction, respectively.

  Further, the barrier mechanism 100 includes an operating piece 108. The operating piece 108 has a shape that tapers toward the objective side, and is movable in the optical axis direction. The operating piece 108 is positioned closer to the eyepiece than the power transmission piece 106 in the optical axis direction when the barrier blade 101 is positioned at the closed position. When the working piece 108 moves from the eyepiece side to the objective side, the working piece 108 abuts on the working piece receiving portion 204 formed by the power transmission piece 106 from the eyepiece side, and moves while pushing the gap between the pair of power transmission pieces 106 open. To do.

  The distance between the pair of power transmission pieces 106 is maximized when the size of the working piece 108 in the contact / separation direction, that is, the width of the working piece 108 is the largest. The barrier blade 101 is positioned in the open position when the distance between the pair of power transmission pieces 106 facing in the approaching / separating direction is maximized.

  The operating piece 108 moves as the lens apparatus 200 changes state, and is positioned closer to the eyepiece than the power transmission piece 106 in the optical axis direction in the retracted state. Further, the operating piece 108 moves as the state of the lens device 200 changes. In the extended state, the operating piece 108 abuts on the operating piece receiving portion 204, and the distance between the pair of power transmission pieces 106 is maximized.

  When the operating piece 108 moves from the objective side to the eyepiece side, the pair of power transmission pieces 106 gradually reduce the interval according to the width of the operating piece 108 by the urging force of the compression spring 103. The barrier blade 101 is positioned at the closed position when the operating piece 108 moves to a position where the operating piece receiving portion 204 is formed by the pair of opposing power transmission pieces 106.

  When the operation piece 108 moves from the objective side to the eyepiece side, the operation piece 108 stops at a position in contact with each power transmission piece 106 that forms the operation piece receiving portion 204. Thereby, in the closed state, the position of the power transmission piece 106 in the contact / separation direction can be stably set at a fixed position.

  Specifically, the operating piece 108 is, for example, an object side by connecting a member (for example, reference numeral 803 in FIG. 8) provided to be rotatable about the optical axis and the operating piece 108 via a cam mechanism. It is possible to move between the end position of the eyepiece and the end position on the eyepiece side.

  The distance that the operating piece 108 moves between the end position on the objective side and the end position on the eyepiece side is the amount of change (length) in the optical path length when moving from the retracted state to the extended state, or the extended amount It is longer than the amount of change (length) of the optical path length when moving from the state to the retracted state. The operating piece 108 moves such that the end (tip) on the objective side contacts the power transmission piece 106 in the extended state and the end (tip) on the objective side moves away from the power transmission piece 106 in the retracted state. .

  Next, a method for attaching the guide pole 107 will be described. 6 and 7 are explanatory views showing a method of attaching the guide pole 107. FIG. FIG. 6 shows a cross section in which a part of the lens barrel 202 in the lens device 200 is cut so that the guide pole 107, the compression spring 103, the power transmission piece 106 and the like are opened to the outside. In FIG. 7, the BB cross section in FIG. 6 is shown.

  6 and 7, the guide pole 107 is supported by the front frame 201 and the lens barrel 202. The front frame 201 includes a pole receiving portion 601 that protrudes from the eyepiece side of the front frame 201 toward the eyepiece side. The pole receiving portion 601 abuts on the pole receiving portion 602 provided on the lens barrel 202 when the front frame 201 is attached to the lens barrel 202, and supports the pole between the pole receiving portion 602 provided on the lens barrel 202. Hole 603 is formed.

  The guide pole 107 is attached to the lens barrel 202 by being pinched by the pole receiving portions 601 and 602 in the hole 603 for supporting the pole. By sandwiching the guide pole 107 by the pole receiving portions 601 and 602, the guide pole 107 can be fixed without using screws or adhesives, and the mounting work of the guide pole 107 can be facilitated. .

  Next, a method for driving the operating piece 108 will be described. FIG. 8 is an explanatory diagram showing a method of driving the operating piece 108. In FIG. 8, the operating piece 108 includes a protrusion 801 that protrudes in the outer circumferential direction of a circle centered on the optical axis. The protrusion 801 is engaged with a cam groove 804 provided in a cam cylinder 803 located on the outer peripheral side of the rectilinear cylinder 802 via a rectilinear groove (not shown) provided in the rectilinear cylinder 802. The rectilinear groove penetrates the rectilinear cylinder 802 in the radial direction of the rectilinear cylinder 802, and restricts the position where the protrusion 801 moves so that the protrusion 801 inserted into the rectilinear groove moves only in the optical axis direction.

  The rectilinear cylinder 802 is movable in the optical axis direction. Since the configuration that allows the rectilinear cylinder 802 to be movable in the optical axis direction can be easily realized by using various known techniques, description thereof is omitted. The cam cylinder 803 has a substantially cylindrical shape and is rotatable relative to the rectilinear cylinder 802 around the optical axis. The cam groove 804 is formed on the inner peripheral surface of the cam cylinder 803 and has a spiral shape with the optical axis as the axis.

  Since the protrusion 801 is inserted into the cam groove 804 via the rectilinear groove, when the first cam cylinder 803 rotates with respect to the rectilinear cylinder 802, the protrusion 801 inserted into the rectilinear groove rotates with the cam cylinder 803. However, since the protrusion is inserted into the rectilinear groove, it does not move in the direction intersecting the optical axis, but moves only in the optical axis direction in the rectilinear groove. The position of the protrusion 801 moves from the right side to the left side or from the left side to the right side in FIG. 8 according to the rotation direction of the cam cylinder 803 with respect to the rectilinear cylinder 802.

  The protrusion 801 moves in the optical axis direction by movement of the rectilinear cylinder 802 in the optical axis direction and relative rotation of the cam cylinder 803 with respect to the rectilinear cylinder 802. Accordingly, the operating piece 108 can be reciprocated in the optical axis direction, and the two barrier blades 101 can be reciprocated in the contact / separation direction.

  In this embodiment, for example, by adjusting the inclination angle of the longitudinal direction of the cam groove 804 in the cam mechanism linking the cam cylinder 803 and the operating piece 108 with respect to the optical axis direction, The movement distance of the operating piece 108 between the eyepiece side end position is the change amount (length) of the optical path length when moving from the retracted state to the extended state, or when moving from the extended state to the retracted state. It can be made longer than the change amount (length) of the optical path length.

  More specifically, for example, the cam groove (not shown) in the cam mechanism that changes the longitudinal inclination angle of the cam groove 804 with respect to the optical axis direction into the retracted state and the extended state of the lens device 200. The amount of movement of the operating piece 108 relative to the amount of rotation of the cam cylinder 803 can be increased by adjusting the angle so as to be parallel to the optical axis direction rather than the inclination angle in the longitudinal direction.

  Thereby, the distance (length) of change in the optical path length when the operating piece 108 moves between the end position on the objective side and the end position on the eyepiece side when moving from the retracted state to the extended state, Or it can be made longer than the change amount (length) of the optical path length at the time of movement from the extended state to the retracted state.

  The lens barrel 202, the rectilinear barrel 802, and the cam barrel 803 are relatively displaceable in the optical axis direction. For example, when switching the power supply ON / OFF in the imaging apparatus on which the lens apparatus 200 is mounted, The optical path length in the lens apparatus 200 is expanded and contracted by displacing the lens.

  The barrier mechanism 100 moves the operating piece 108 in synchronization with the expansion / contraction operation of the optical path length in the lens device 200 to open / close the barrier blade 101. The barrier blade 101 is opened and closed on the objective side with respect to the objective lens 805 and on the eyepiece side with respect to the front frame 201 in the optical axis direction (thrust direction).

  The objective lens 805 is held on the lens barrel 202 via a lens holding frame 806. The objective lens 805 may be movable relative to the lens barrel 202 in the optical axis direction, or may be fixed with respect to the lens barrel 202.

  The lens device 200 extends the optical path length when the power is turned on, and the barrier blade 101 moves the operating piece 108 along with the extending operation of the optical path length to position the barrier blade 101 in the open position. The lens device 200 contracts the optical path length when the power is turned off, and the barrier blade 101 moves the operating piece 108 in accordance with the contraction operation of the optical path length to position the barrier blade 101 in the closed position.

  In the conventional barrier mechanism in which the optical path is opened and closed by rotating the barrier blade provided so as to be rotatable in a direction crossing the optical path, the barrier blade can be rotated about the optical axis to rotate the barrier blade. A member (rotating ring) was provided. This rotating ring converts the driving force in the optical axis direction generated when the optical path length of the lens device 200 is expanded and contracted into the driving force in the rotating direction by the rotating ring.

  According to this embodiment, the force applied to the relative displacement in the optical axis direction of the barrel 202, the rectilinear barrel 802, and the cam barrel 803 can be directly used for the opening / closing operation of the barrier blade 101. As a result, it is generated by relative displacement in the optical axis direction of the lens barrel 202, the rectilinear barrel 802, and the cam barrel 803 when the power is turned on / off without providing a member for changing the rotational direction of the driving force such as a rotating ring. The driving force in the direction of the optical axis can be used as it is as the driving force of the operating piece 108, so that the number of parts can be reduced and the configuration can be simplified.

  As described above, according to the barrier mechanism 100 according to the embodiment of the present invention, a pair that is provided so as to be movable in the approaching / separating direction and that is selectively positioned at a position where the optical path is opened or closed by moving. And a guide pole 107 provided at a position retracted from the optical path and engaged with the pair of barrier blades 101 so as to be movable along the contact / separation direction. By restricting the movement position of the barrier blade 101 by the guide pole 107, the barrier blade 101 moves only in a plane intersecting the optical axis. Therefore, the movement of the barrier blade 101 in the optical axis direction (barrier in the thrust direction) is simplified. The position of the barrier blade 101 in the thrust direction can be stabilized.

  Further, according to the barrier mechanism 100 of the embodiment of the present invention, the manufacturing accuracy of parts for securing a space for the movement of the barrier blade 101 and the assembling precision of these parts are not strictly managed. The barrier blade 101 can be moved reliably and with high accuracy.

  Furthermore, according to the barrier mechanism 100 of the embodiment of the present invention, it is not necessary to secure a space for the barrier blade 101 to move, so that foreign matters such as dust are less likely to collect in the moving region of the barrier blade 101. Prevents the movement of the barrier blades 101, and the barrier blades 101 move linearly, so that the generation of foreign matter is suppressed as compared with the conventional barrier mechanism 100 that pivots to open and close the barrier blades 101. Therefore, it is possible to suppress the malfunction of the barrier blade 101 caused by the foreign matter.

  Thus, according to the barrier mechanism 100 of the embodiment of the present invention, it is easy to mass-produce the barrier mechanism 100 that ensures high resistance to external factors such as dust and vibration and high positional accuracy of the barrier blades 101 in the thrust direction. Can be achieved.

  According to the barrier mechanism 100 of this embodiment, the objective lens 805 can be reliably protected from the outside by managing the gap between the barrier blades 101. Further, according to the barrier mechanism 100 of this embodiment, the movement of the barrier blade 101 in the thrust direction (barrier blade rampage caused by twisting or vibration of the barrier blade) can be prevented. As compared with the conventional barrier mechanism in which the rotation of the barrier blades is improved, it is possible to improve the resistance to external factors and to improve the aesthetic appearance in the state where the barrier blades 101 are closed.

  Further, according to the barrier mechanism 100 of the embodiment of the present invention, the guide pole 107 extends in the contact / separation direction of the pair of barrier blades 101 at a position where the pair of barrier blades 101 are engaged and retracted from the optical path. Since it is characterized by having a pole shape that protrudes, the movement position of the barrier blade 101 is restricted by a guide pole 107 having a pole shape by moving the barrier blade 101 in the optical axis direction with a simple configuration (in the thrust direction). The blurring of the barrier blade 101 can be prevented.

  As a result, the position of the barrier blade 101 in the thrust direction is stabilized by a simple configuration, and the resistance to external factors such as dust and vibration is improved, and high positional accuracy of the barrier blade 101 in the thrust direction is ensured. The mass production of the barrier mechanism 100 can be facilitated.

  Further, according to the barrier mechanism 100 of the embodiment of the present invention, the guide pole 107 is characterized in that each of the pair of barrier blades 101 is engaged. By restricting with the same guide pole 107, the pair of barrier blades 101 in the closed position can be brought into contact with each other with a simple configuration.

  As a result, even when an external force such as vibration during conveyance is applied to the barrier mechanism 100, the optical path can be reliably closed at the closing position with a simple configuration, and the appearance of the barrier mechanism 100 can be improved. be able to.

  In addition, according to the barrier mechanism 100 of the embodiment of the present invention, the guide pole 107 is engaged with both end portions in the width direction of the pair of barrier blades 101, and therefore, regardless of the diameter of the optical path. Therefore, the movement of the barrier blade 101 in the optical axis direction (blur of the barrier blade 101 in the thrust direction) can be prevented with a simple configuration.

  As a result, the position of the barrier blade 101 in the thrust direction can be stabilized with a simple configuration regardless of the diameter of the optical path, and the barrier mechanism 100 that ensures high positional accuracy of the barrier blade 101 in the thrust direction can be easily mass-produced.

  Further, according to the barrier mechanism 100 of the embodiment of the present invention, the compression spring 103 as an example of an urging member that urges the pair of barrier blades 101 in a direction in which the pair of barrier blades 101 are in contact with each other or away from each other. Since each barrier blade 101 is biased in a direction parallel to the movement direction (radial direction) of the barrier blade 101, the position of the barrier blade 101 in the movement direction is stabilized. Can do.

  As a result, the position of the barrier blade 101 in the thrust direction and the radial direction can be stabilized, and the barrier mechanism 100 that ensures high positional accuracy of the barrier blade 101 in the thrust direction and the radial direction can be easily mass-produced.

  Further, according to the barrier mechanism 100 of the embodiment of the present invention, the compression spring 103 as an example of a biasing member that biases the pair of barrier blades 101 in the direction in which the pair of barrier blades 101 contact each other, and the optical axis The operation piece 108 is movable in the direction and has a shape that tapers toward the object side, and is connected to the pair of barrier blades 101, and the pair of barrier blades 101 is positioned at the closing position. A pair of power transmission pieces 106 constituting an operating piece receiving portion 204 that allows insertion of the operating piece 108, and the operating piece 108 comes into contact with the operating piece receiving portion 204 from the eyepiece side and By moving toward the objective side in the optical axis direction while pushing the gap, the barrier blade 101 is positioned at the opening position, and on the eyepiece side in the optical axis direction. Since it is characterized by positioning the barrier blade 101 in a closed position by moving in the past, a mechanism that the lens device 200 generally has as a structure for expanding and contracting the optical path length, such as a zoom lens device, is used. The barrier blade 101 can be opened and closed by moving the operating piece 108 by a driving force when expanding and contracting the optical path length. This eliminates the need for a rotating ring for rotating the barrier blades provided in a conventional barrier device having a structure for rotating the barrier blades.

  The lens device 200 according to the embodiment of the present invention includes an objective lens 805 as an example of a lens provided on the optical path, and the position at which the pair of barrier blades 101 opens the optical path of the objective lens 805 or the optical path. Opening and closing by selectively positioning a pair of barrier blades at the close position prevents foreign matter such as dust from entering, prevents malfunction of the barrier blades due to entry of foreign matter, and prevents the lens from It can be surely protected.

  In addition, according to the imaging device including the lens device 200 according to the present invention, the lens device 200 is thinned by forming an optical path through which external light is incident on an imaging device such as a CCD using the lens device 200. As a result, the image pickup apparatus can be reduced in size, and the lens can be protected against external factors such as dust and vibration, thereby preventing deterioration in image quality due to foreign matter being mixed and capturing a high-quality image. .

  In the above-described embodiment, the compression spring 103 that urges the two barrier blades 101 toward each other is provided. However, the present invention is not limited to this. Instead of the compression spring 103, a biasing member (for example, a contraction spring or the like) that biases the pair of barrier blades 101 away from each other, that is, the pair of barrier blades 101 to the open position side may be provided.

  In this case, the operating piece moves in the optical axis direction while contacting the power transmission piece from the eyepiece side in accordance with switching between the retracted state and the extended state, thereby transmitting power in a direction against the urging force of the urging member. A piece or barrier blade is slid. By adopting such a configuration, the barrier blades 101 can be always urged in the opening direction as compared with the above-described embodiment, so that unopened portions can be prevented.

  As described above, according to this embodiment, it is possible to improve the position accuracy of the barrier blades in the thrust direction and to control dust, etc., without strictly managing the manufacturing accuracy and assembly accuracy of the components constituting the barrier mechanism. The intrusion of foreign matter can be prevented. Thereby, it is possible to facilitate mass production of a barrier mechanism that ensures high resistance to external factors such as dust and vibration and high positional accuracy of the barrier blades in the thrust direction.

  As described above, the barrier mechanism 100, the lens device 200, and the imaging device according to the present invention are useful for protecting the objective lens from external impacts and contamination by covering the objective lens of the camera during non-imaging. In particular, it is suitable for a barrier mechanism 100 and a lens device 200 that are mounted on a small-sized imaging device such as a compact camera, and an imaging device on which these barrier mechanism 100 or lens device 200 is mounted.

It is explanatory drawing (the 1) which shows the barrier mechanism of embodiment concerning this invention. It is explanatory drawing (the 2) which shows the barrier mechanism of embodiment concerning this invention. It is explanatory drawing (the 3) which shows the barrier mechanism of embodiment concerning this invention. It is explanatory drawing (the 4) which shows the barrier mechanism of embodiment concerning this invention. It is a perspective view which shows a barrier blade | wing. It is explanatory drawing (the 1) which shows the attachment method of a guide pole. It is explanatory drawing (the 2) which shows the attachment method of a guide pole. It is explanatory drawing which shows the drive method of an operating piece.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Barrier mechanism 101 Barrier blade 103 Compression spring 107 Guide pole 200 Lens device 201 Front frame 805 Objective lens

Claims (10)

A pair that is provided so as to be movable in a direction that makes contact with and away from each other within a plane that intersects the optical axis (hereinafter referred to as “contact and separation direction”), and that is selectively positioned at a position that opens or closes the optical path by moving. The barrier blades,
A guide member provided at a position retracted from the optical path and engaged with the pair of barrier blades so as to be movable along the contact / separation direction;
A barrier mechanism characterized by comprising:   2. The guide member according to claim 1, wherein the guide member has a pole shape extending in a contact / separation direction of the pair of barrier blades at a position where the pair of barrier blades are engaged and retracted from the optical path. Barrier mechanism.   The barrier mechanism according to claim 2, wherein each of the pair of barrier blades is engaged with the guide member.   The barrier mechanism according to claim 1, wherein the guide member is engaged with both end portions in the width direction of the pair of barrier blades.   5. The barrier mechanism according to claim 1, further comprising an urging member that urges the pair of barrier blades in a direction in which the pair of barrier blades are in contact with or apart from each other. A biasing member that biases the pair of barrier blades in any one of the contact and separation directions;
A power transmission piece coupled to each of the pair of barrier blades and slidable in the contact / separation direction;
An operating piece that contacts the power transmission piece and moves the barrier blade in the contact / separation direction via the power transmission piece by being displaced with respect to the power transmission piece in the optical axis direction;
The barrier mechanism according to claim 1, wherein the barrier mechanism is provided. A biasing member that biases the pair of barrier blades in a direction in which the pair of barrier blades are in contact with each other;
An actuating piece that is displaceable with respect to the optical axis direction and has a tapered shape toward the objective side;
An operating piece receiver that is connected to the pair of barrier blades and allows the insertion of the operating piece by being displaced relative to the operating piece when the pair of barrier blades are positioned at the closing position. A pair of power transmission pieces constituting the unit;
With
The working piece is a position for opening the barrier blade by moving toward the objective side in the optical axis direction while abutting the working piece receiving portion from the eyepiece side and pushing open the distance between the pair of power transmission pieces. The barrier mechanism according to claim 1, wherein the barrier blade is positioned at a closed position by moving toward the eyepiece side in the optical axis direction.   The barrier mechanism according to claim 6, wherein the pair of power transmission pieces are not in contact with each other when the barrier blades are positioned at the closing position. A lens provided on the optical path;
The barrier mechanism according to any one of claims 1 to 8, comprising a pair of barrier blades selectively positioned at a position where the optical path of the lens is opened or a position where the optical path is closed.
A lens apparatus comprising: An image sensor;
The lens apparatus according to claim 9, which forms an optical path through which external light is incident on the image sensor;
An imaging apparatus comprising:

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