JP2014126792A - Lens hood and imaging apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the number of components of a lens hood to be attached to an imaging apparatus and to improve the feeling of barrier opening/closing operations.SOLUTION: A barrier 111 of a lens hood 110 is rotatable around a barrier revolving shaft 311, and a cam shaft 313 of the barrier 111 is inserted through a cam guide hole 315 of a slide member 204, and the barrier 111 is moved between a closing position and an opening position by slide operation of the slide member 204. The cam guide hole 315 has a shape of which the width is increased in accordance with the increase in distance from the barrier revolving shaft 311 in a direction orthogonal to a slide direction of the slide member 204, and the barrier 111 is urged in each of the closing position and the opening position by a reversal spring 206. The reversal spring 206 is configured so that, when the slide member 204 is slid, the reversal spring 206 urges the barrier 111 toward the closing position in a state where the cam shaft 313 is not in contact with a side surface of the cam guide hole 315.

Description

  The present invention relates to a lens hood and an imaging device to which the lens hood is attached.

  When a video camera is used, a lens hood that shields harmful light entering the imaging lens barrel may be attached. As such a lens hood, in addition to the harmful light shielding function, it also protects the front lens part of the imaging lens, and has a barrier function to prevent the inside from becoming hot due to condensing in the imaging lens when not in use. The thing provided is proposed (refer patent document 1).

JP 2005-17523 A

  However, since the lens hood described in Patent Document 1 has two barrier members on the upper and lower sides, there is a problem that the number of parts is large and the structure is complicated. In addition, since the structure is complicated, it is difficult to improve the operational feeling of opening and closing the barrier.

  An object of the present invention is to provide a lens hood with a reduced number of parts and an improved operational feeling for opening and closing a barrier.

  The lens hood according to the present invention is a lens hood attached to the front of the imaging lens with respect to the imaging device, and a closed position for protecting the imaging lens and imaging of the subject by incorporating reflected light from the subject into the imaging lens. A barrier member that can be moved between an open position that enables movement, a slide member that moves the barrier member between the closed position and the open position by sliding in a predetermined sliding direction, and the barrier member A reversing spring in which the direction of the urging force on the barrier member is switched while the barrier member moves between the closed position and the open position. It is possible to move between a closed position that protects the imaging lens and an open position that allows reflected light from the subject to be taken into the imaging lens. A rear member, a slide member for moving the barrier member between the closed position and the open position by sliding in a predetermined sliding direction, and the barrier member on each of the open position side and the closed position side And a reversing spring that switches the direction of the urging force with respect to the barrier member while the barrier member moves between the closed position and the open position.

  According to the lens hood of the present invention, the number of parts can be reduced and the operational feeling of opening and closing the barrier can be improved.

It is a perspective view which shows the external appearance structure of the video camera which concerns on embodiment of this invention. It is a perspective view which shows the lens hood shown in FIG. It is the side view and perspective view which show the structure of the hood front cover which comprises the lens hood shown in FIG. 2, and a perspective view which shows the structure of an internal component. It is a side view which shows a mode that a barrier moves between a closed position, a neutral position, and an open position in the state which removed the hood back cover from the lens hood shown in FIG. It is a figure which shows the change of the position of the cam guide hole provided in the slide member which comprises the lens hood shown in FIG. FIG. 3 is a rear view showing a hood rear cover constituting the lens hood shown in FIG. 2 as a single unit and a rear view with a hood front cover attached. It is xy sectional drawing of a lens hood when the barrier with which the lens hood shown in FIG. 2 is provided exists in an open position.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. Here, a configuration in which the lens hood according to the present invention is attached to a digital video camera (hereinafter referred to as “video camera”) which is an example of an imaging apparatus will be taken up. However, the present invention is not limited to this, and the lens hood according to the present invention can also be applied to other imaging devices (for example, a single-lens reflex camera).

<Appearance structure of video camera>
FIG. 1 is a perspective view showing an external configuration of a video camera 101 according to an embodiment of the present invention. In the following description, each component of the video camera 101 will be described based on the three-dimensional orthogonal coordinate system shown in FIG. A direction parallel to the lens optical axis (imaging optical axis) of the video camera 101 is defined as an x direction. Among these, the + x direction on the subject side in the optical axis direction is “front”, and the −x direction on the image sensor side in the optical axis direction is “rear”. Further, the + z direction, which is the horizontal direction when the video camera 101 is viewed from the front side with the video camera 101 held in a normal posture, is set to “right”, and the −z direction is set to “left”. Further, the vertical direction when the video camera 101 is viewed from the front side while the video camera 101 is held in the normal posture is defined as the y direction. Among the y directions, the + y direction that is upward in the vertical direction is “up”, and the −y direction that is downward in the vertical direction (gravity direction) is “down”.

  FIG. 1A shows only the main body of the video camera 101. The video camera 101 is a general digital video camera, and has an imaging lens front lens portion 103 on the front surface of the main body, a display portion 104 that can be opened and closed (stored) on the right side surface of the main body, and a left side surface of the main body. Has a gripping portion 105. An optical member opening 106 is provided below the imaging lens front lens portion 103 of the video camera 101. Further, behind the optical member opening 106 of the video camera 101, optical members such as a distance measuring sensor, a light emitting unit, and a light receiving unit are arranged. In addition to the optical member, a member that requires an opening such as a sound collecting microphone may be disposed behind the optical member opening 106. In the present embodiment, it is assumed that a distance measuring sensor is arranged.

  In the video camera 101, hood engaging portions 107 are provided at three locations around the imaging lens front lens portion 103. In addition, a circular rotation operation member 108 is provided on the rear side of the outer periphery of the hood engaging portion 107 of the video camera 101. A sound collection microphone 109 is provided on the upper surface of the video camera 101 behind the rotation operation member 108.

  FIGS. 1B and 1C show a state in which the lens hood 110 is attached to the main body of the video camera 101. FIG. 1B is a diagram showing an open state of the lens hood 110 (a state in which a barrier member (hereinafter referred to as “barrier”) 111 is in the open position). FIG. 1C is a diagram illustrating a closed state of the lens hood 110 (a state where the barrier 111 is in the closed position).

  The lens hood 110 is attached in front of the imaging lens front lens portion 103 and functions as a hood that blocks harmful light entering the imaging lens front lens portion 103. The lens hood 110 includes a barrier 111. The barrier 111 protects the front lens portion 103 of the imaging lens and prevents the inside from becoming hot due to light collection in the imaging lens through the front lens portion 103 when the video camera 101 is not used. The state of FIG. 1B in which the barrier 111 is in the open position indicates a use state where the subject can be imaged. In the state of FIG. 1B, the barrier 111 can allow reflected light from the subject to enter the imaging lens barrel (not shown) through the imaging lens front lens portion 103. On the other hand, the state of FIG. 1C in which the barrier 111 is in the closed position indicates a state in which the imaging lens front lens portion 103 and the inside of the main body are protected. In the state of FIG. 1C, the barrier 111 blocks light from entering the imaging lens barrel (not shown) through the imaging lens front lens portion 103.

  The lens hood 110 includes a barrier operation knob 112. The lens hood 110 is in an open state (the barrier 111 is in an open position) when the barrier operation knob 112 is moved downward, and is in a closed state (the barrier 111 is in a closed position) when it is moved upward. The lens hood 110 is provided with an opening 113 so that the optical member opening 106 is not shielded when the lens hood 110 is attached. As shown in FIG. 1C, in the present embodiment, the barrier 111 is configured not to shield the optical member opening 106 when in the closed position. However, the present invention is not limited to this, and the barrier 111 is in the closed position. In some cases, the optical member opening 106 may also be closed.

<Details of lens hood configuration>
FIG. 2 is a perspective view showing the lens hood 110 as a single unit, and shows the lens hood 110 in different directions (a) to (d). 2A is a right external perspective view of the lens hood 110. FIG. The lens hood 110 includes a front hood cover 201, a rear hood cover 202, a barrier operation knob 112, and a barrier 111 that are exposed to the exterior, and internal members that will be described later that are not exposed to the exterior. As will be described in detail later, the barrier 111 is composed of a single sheet, so that if the brand logo is to be displayed on the barrier 111, the brand logo can be displayed without being divided in the center of the barrier 111. It has become.

  FIG. 2B is a left external perspective view of the lens hood 110. On the rear surface of the lens hood 110, there are provided engaging claws 203 that engage with each of the three hood engaging portions 107 provided on the main body of the video camera 101.

  FIG. 2C is a right side perspective view showing a state where the rear hood cover 202 is removed from the lens hood 110. FIG. 2D is a left perspective view showing a state where the rear hood cover 202 is removed from the lens hood 110. The aforementioned internal members constituting the lens hood 110 include a slide member 204, a damper 205, and a reversing spring 206. The slide member 204 moves integrally with the barrier 111 by being connected to the barrier operation knob 112. The damper 205 relaxes the movement of the slide member 204. The reversal spring 206 is a string-wound spring in the present embodiment, and is disposed on the left side surface. The end of the reversing spring 206 is hooked on a spring hook shaft 207 on the barrier 111 side and a spring hook shaft 208 on the hood front cover 201 side. As will be described later, the reversing spring 206 urges the barrier 111 toward the closed position or toward the open position, and holds the barrier 111 at each of the closed position and the open position.

  FIG. 3 is a view showing the hood front cover 201 and internal parts. FIG. 3A is a right side view of the hood front cover 201. On the right side surface of the hood front cover 201, an upper slide shaft 301, a lower slide shaft 302, and a damper mounting portion 303 are provided. The functions of the upper slide shaft 301 and the lower slide shaft 302 will be described later with reference to FIG.

  FIG. 3B is a left perspective view of the hood front cover 201. On the rear surface of the hood front cover 201, a right barrier rotation bearing 304 and a left barrier rotation bearing 305 are provided, and fastening portions 306 with the hood rear cover 202 are provided at four locations. The hood front cover 201 has a hood opening 307 provided for the imaging lens front ball portion 103, and has a spring hook shaft 208 on the left side surface of the hood front cover 201.

  The front hood cover 201 includes a hood inner wall 308 formed in a quadrangular pyramid shape, and a distance measurement sensor inner wall 309 formed in a quadrangular pyramid shape from the opening 113 of the distance measurement sensor. The hood inner wall 308 is formed with a predetermined thickness along a surface formed in a range where the angle of view of the imaging lens of the video camera 101 cannot be obtained. The distance measuring sensor inner wall 309 is also formed with a predetermined thickness along a surface formed in a range where the effective light flux of the distance measuring sensor cannot be obtained.

  The front hood cover 201 is provided with a barrier insertion hole 310 for allowing the barrier 111 to be inserted during assembly. FIG. 3C is a perspective view showing a state in the middle of inserting the barrier 111 from the barrier insertion hole 310. The barrier 111 has a barrier rotation shaft 311 that is a rotation shaft that enables the barrier 111 to move between a closed position and an open position by a rotation operation. The barrier 111 has a spring hook shaft 207 formed at the left end of the barrier rotation shaft 311. The barrier 111 includes a lens protection unit 312 that protects the front lens portion 103 of the imaging lens, a camshaft 313 that engages with the slide member 204, and a camshaft support portion 314 on which the camshaft 313 is formed.

  The lens protecting portion 312 is inserted into the barrier insertion hole 310 formed in the front hood cover 201 so that the barrier rotation shaft 311 contacts the right barrier rotation bearing 304 and the left barrier rotation bearing 305 so that the barrier 111 is covered with the hood front cover. Assemble to 201. FIG. 3D is a right side perspective view showing a state in which the slide member 204 and the damper 205 are further assembled after the barrier 111 is assembled to the hood front cover 201. A cam shaft 313 provided in the barrier 111 is inserted into a cam guide hole 315 provided in the slide member 204, and the slide guide hole 316 of the slide member 204 and the upper slide shaft 301 provided in the hood front cover 201 and the lower slide are provided. The shaft 302 is fitted.

  A damper 205 is attached to the slide member 204. FIG. 3E is a perspective view showing an assembled state of the slide member 204 and the damper 205. The gear portion 317 provided on the slide member 204 and the rotary gear 318 of the damper 205 are engaged, and resistance is applied to the rotary motion of the rotary gear 318 by the viscous fluid filled in the damper 205, whereby the slide member 204. It is configured to give resistance to the movement of the. In addition, the camshaft support portion 314 of the barrier 111 has a substantially sector shape centered on the barrier rotation shaft 311, and the contact surface with the cam guide hole 315 of the slide member 204 is made large. This prevents the barrier 111 from being caught during rotation and prevents the hood front cover 201 from interfering with the hood inner wall 308.

  4A to 4F show a state in which the barrier 111 moves between the closed position, the neutral position, and the open position with the rear hood cover 202 removed from the lens hood 110. FIG.

  FIG. 4A is a right side view when the barrier 111 is in the closed position. FIG. 4B is a left side view when the barrier 111 is in the closed position. When the barrier 111 is in the closed position, as shown in FIG. 4A, the cam shaft 313 of the barrier 111 is in contact with the upper end side of the cam guide hole 315 of the slide member 204. At this time, as shown in FIG. 4B, the reversing spring 206 biases the barrier 111 by urging the spring hook shaft 207 on the barrier 111 side in the direction of arrow A (clockwise direction in FIG. 4B). Holding in the closed position.

  In FIG. 4B, the locus of the spring hook shaft 207 on the barrier 111 side is indicated by a broken line. The position 402 is a position where the spring engaging shaft 207 on the barrier 111 side comes on an extension line 401 connecting the center of the barrier rotating shaft 311 and the spring engaging shaft 208 on the hood front cover 201 side. The position 402 is a neutral position where the urging force of the reversing spring 206 acts to rotate the barrier rotating shaft 311 clockwise and counterclockwise. This position 402 (neutral position) is open relative to the middle of the position of the spring hook shaft 403 in the open position, which is the rotation end of the barrier 111, and the position of the spring hook shaft 403 in the closed position (center 404 of the rotation range of the barrier 111). It is biased to the position side.

  FIG. 4C is a right side view when the barrier 111 is in the neutral position. FIG. 4D is a left side view when the barrier 111 is in the neutral position. As shown in FIG. 4C, the slide member 204 is moved downward with the cam shaft 313 of the barrier 111 in contact with the upper end side of the cam guide hole 315 provided in the slide member 204. Is rotated in the direction of arrow B (clockwise direction). At this time, as shown in FIG. 4D, the reversing spring 206 is in a neutral position between the spring hook shaft 207 on the barrier 111 side and the spring hook shaft 208 of the hood front cover 201. As described above, this neutral position is set not at the center 404 of the rotation range of the barrier 111 but at a position deviated from the center 404 toward the open position.

  When the barrier 111 further moves in the opening direction (the direction of arrow B in FIG. 4C) from the state of FIG. 4C, the reversing spring 206 moves in the direction of the arrow C shown in FIG. 4D (FIG. 4D). In order to generate an urging force in the counterclockwise direction, the barrier 111 tends to move in the opening direction. That is, as shown in FIG. 4E, the camshaft 313 of the barrier 111 is biased in a direction in which the camshaft 313 contacts the lower end of the cam guide hole 315 of the slide member 204. FIG. 4E is a right side view when the barrier 111 is in the open position. FIG. 4F is a left side view when the barrier 111 is in the open position. As shown in FIG. 4 (f), when the barrier 111 is in the open position, the reversing spring 206 urges the barrier 111 in the direction of arrow C (counterclockwise in FIG. 4 (f)). 111 is held in the open position.

  Here, the length 405 of the reversing spring 206 in the open position shown in FIG. 4 (f) is longer than the length 406 of the reversing spring 206 in the closed position shown in FIG. 4 (b). Therefore, the biasing force of the reversal spring 206 against the barrier 111 is greater when the barrier 111 is in the open position than when it is in the closed position. Thereby, it is possible to prevent the barrier 111 from being inadvertently closed during shooting by the video camera 101.

  FIG. 5 is a diagram illustrating a change in the position of the cam guide hole 315 provided in the slide member 204. FIG. 5A shows the position of the camshaft 313 when the barrier 111 is in the closed position, and the camshaft 313 is shown by a solid line. On the other hand, in FIG. 5A, the position of the camshaft 313 when the barrier 111 is in the neutral position shown in FIG. 4D is indicated by a broken line 501, and the barrier 111 is in the open position of FIG. The position of the camshaft 313 when it is at is indicated by a broken line 502.

  In FIG. 5A, the center line of the rotation range of the barrier 111 is indicated by a one-dot chain line 503. FIG. 5B shows a state in which the camshaft 313 is positioned on the alternate long and short dash line 503 that is the center line of the rotation range of the barrier 111, and the camshaft 313 is shown by a solid line. FIG. 5C shows a state where the camshaft 313 is located at the neutral position of the barrier 111, and the camshaft 313 is shown by a solid line.

  The cam guide hole 315 is not a guide hole having a uniform width, but has a shape (substantially trapezoidal shape) that increases in width as it moves away from the barrier rotation shaft 311 in a direction perpendicular to the sliding direction of the slide member 204 (going backward). It has become. This is because when the slide member 204 is slid in order to move the barrier 111 from the closed position to the open position, the side surface (slope) of the cam guide hole 315 and the cam shaft 313 contact each other as shown in FIG. The purpose is to generate a component force 504 in the rotation direction (clockwise direction) of the barrier 111 at the contact position. By generating this component force 504, it is possible to reduce the frictional force between the camshaft 313 and the cam guide hole 315 that affects the force of the barrier 111 to start moving. Note that the same action also works when the barrier 111 moves from the open position to the closed position.

  However, when the cam guide hole 315 has a wide rear (imaging device side) width as shown in FIG. 5A, the play amount of the cam guide hole 315 with respect to the cam shaft 313 is wide at the rear wide position. Becomes larger. In other words, since the degree of freedom of movement in the vertical direction increases, there is a risk that rattling during operation will increase.

  Therefore, in order to make the rattling unnoticeable, the neutral position of the reversing spring 206 is biased as described with reference to FIG. That is, in FIG. 5B, the camshaft 313 has the largest shakiness position (the barrier 111 is at the center of the rotation angle, and the vertical space between the camshaft 313 and the cam guide hole 315 is the largest. The position when it is in position. In this state, since the reversing spring 206 is closer to the closed position than the neutral position, the camshaft 313 is biased in the closing direction.

  The positional relationship between the camshaft 313 and the cam guide hole 315 when the reversing spring 206 is in the neutral position is in the state shown in FIG. As shown in FIG. 5 (c), in this embodiment, the cam guide hole 315 has a smaller width than the state of FIG. 5 (b), that is, a position with less backlash than FIG. 5 (b). The cam shaft 313 contacts the side surface of the cam guide hole 315.

  Next, the structure of the hood rear cover 202 will be described. FIG. 6A is a rear view showing the rear hood cover 202 alone. FIG. 6B is a rear view showing a state in which the front hood cover 201 is attached to the rear hood cover 202. A blindfold 601 for shielding the structure of the barrier 111 from the appearance is provided above and below the rear hood cover 202.

  In the present embodiment, each of the three engaging claws 203 is formed on the rear hood cover 202 in order to form the engaging claws 203 for engaging with the main body of the video camera 101 without using a complicated mold. A hole 602 is opened in front of. Therefore, as shown in FIG. 6 (b), the hole 602 is closed by a blindfold wall 603 formed in the front hood cover 201, thereby shielding the internal structure of the lens hood 110 from the outside. Yes.

  FIG. 7 is an xy sectional view of the lens hood 110 when the barrier 111 is in the open position. A space 701 that avoids a filter attached to the video camera 101 is provided at a predetermined distance on the main body side of the lens hood 110. In addition, a hood opening 307 is provided at a position escaped from the angle of view 702 of the imaging lens (only the imaging lens front lens portion 103 is shown).

  The position of the lower hood end 703 is defined so that the line 704 connecting the lower end side surface 307a of the hood opening 307 and the lower hood end 703 is at a position translated from the angle of view 702 of the imaging lens by a predetermined distance. The Similarly, a line 706 connecting the tip 705 of the barrier 111 in the open position and the upper side surface 307b of the hood opening 307 is located at a position translated from the angle of view 702 of the imaging lens by a predetermined distance. A position is defined.

  That is, an angle 708 formed by a line 704 connecting the lower end side surface 307a of the hood opening 307 and the lower hood end 703 and the optical axis center line 707 of the imaging lens front lens portion 103 of the imaging lens barrel of the video camera 101 is An angle 709 formed by a line 706 connecting the upper side surface 307b of the hood opening 307 and the tip 705 of the barrier 111 and the optical axis center line 707 is substantially equal. In order to achieve such a positional relationship, the distance 711 from the optical axis center line 707 of the upper hood end 710 of the rear hood cover 202 is longer than the distance 712 from the optical axis center line 707 of the lower hood end 703. There is a need to. That is, the angle 714 formed by the line connecting the upper side surface 307 b of the hood opening 307 and the upper hood end 710 and the optical axis center line 707 is the line 713 connecting the upper side surface 307 b of the hood opening 307 and the tip 705 of the barrier 111. And an angle 709 formed by the optical axis center line 707 is larger.

  Here, in general, when a hood or the like is attached to the video camera, if the hood protrudes to the bottom side when the video camera is placed on a floor or a desk, the video camera is inclined and the quality is impaired. There is a problem that unnecessary load is applied to the hood. In contrast, in the present embodiment, the distance 712 from the optical axis center line 707 to the lower hood end 703 in the lens hood 110 is shorter than the distance 711 from the optical axis center line 707 to the upper hood end 710. Yes. Thereby, even when the video camera 101 is placed on a floor or a desk, the video camera 101 can be prevented from tilting. Therefore, the lens hood can be attached to the video camera and used regardless of the distance from the lower end to the center of the optical axis, and has high versatility.

  In general, the role of the lens hood 110 is to block unnecessary external light incident from the front lens portion 103 of the imaging lens. The unnecessary external light is transmitted to the video camera 101 like sunlight or illumination light. Often incident from the upper side. In contrast, in the lens hood 110 according to the present embodiment, the distance 716 from the hood attachment position 715 to the upper hood end 710 with respect to the video camera 101 is lower than the hood attachment position 715 in order to accommodate the barrier 111 in the open position. It is longer than the distance 717 to the side hood end 703. Therefore, the blocking performance of unnecessary external light incident from the imaging lens front lens portion 103 is improved.

<Other embodiments>
Although the present invention has been described in detail based on preferred embodiments thereof, the present invention is not limited to these specific embodiments, and various forms within the scope of the present invention are also included in the present invention. included. For example, in the above embodiment, the lens hood 110 includes the reversal spring 206 as an internal member. However, instead of the reversal spring 206, an elastic member (for example, a rubber material) having an equivalent function may be used. It is.

DESCRIPTION OF SYMBOLS 101 (Digital) Video camera 103 Image pickup lens front lens part 110 Lens hood 111 Barrier 201 Hood front cover 202 Hood rear cover 204 Slide member 206 Reversing spring 311 Barrier rotating shaft 313 Cam shaft 315 Cam guide hole

Claims (6)

A lens hood attached to the front of the imaging lens with respect to the imaging device,
A barrier member that is movable between a closed position that protects the imaging lens and an open position that allows reflected light from the subject to be taken into the imaging lens and enables imaging of the subject;
A slide member that moves the barrier member between the closed position and the open position by sliding in a predetermined sliding direction;
Reversal in which the barrier member is urged to the open position side and the closed position side, and the direction of the urging force to the barrier member is switched while the barrier member moves between the closed position and the open position. A spring, and
A barrier member that is movable between a closed position that protects the imaging lens and an open position that allows reflected light from the subject to be taken into the imaging lens and enables imaging of the subject;
A slide member that moves the barrier member between the closed position and the open position by sliding in a predetermined sliding direction;
Reversal in which the barrier member is urged to the open position side and the closed position side, and the direction of the urging force to the barrier member is switched while the barrier member moves between the closed position and the open position. A lens hood comprising: a spring. The barrier member is movable by a rotation operation around a rotation axis on which a camshaft is provided and the reversing spring is attached.
The slide member has a cam guide hole through which the camshaft having a shape that increases in width as it moves away from the rotation axis along a direction orthogonal to the slide direction of the slide member;
When the sliding member is slid in the sliding direction, the reversing spring biases the barrier member toward the closed position when the camshaft is not in contact with the side surface of the cam guide hole. The lens hood according to claim 1.   When the sliding member is slid in the sliding direction, the direction of the urging force of the reversing spring that urges the barrier member is switched while the camshaft is in contact with the side surface of the cam guide hole. The lens hood according to claim 2, characterized in that:   When the slide member is slid to move the barrier member from the closed position to the open position, the camshaft is separated in the rotation direction of the barrier member at a position where the camshaft contacts the side surface of the cam guide hole. The lens hood according to claim 2, wherein a force is generated.   5. The biasing force of the reversing spring when the barrier member is in the open position is greater than the biasing force of the reversing spring when the barrier member is in the closed position. The lens hood according to item 1.   An imaging apparatus comprising the lens hood according to claim 1.

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