JP2005106969A - Lens barrier device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a driving ring and a barrier blade rotating around an optical axis by external force acting in an optical axis direction from being deformed by the influence of the external force. <P>SOLUTION: The lens barrier device is equipped with a base 10 arranged forward in the optical axis direction L of a lens and demarcating an aperture part 10a, the barrier blades 20 and 30 provided to freely rock with respect to the base and opening/shutting the aperture part, and the driving ring 40 rotating around the optical axis by the external force acting in the optical axis direction and driving the barrier blades to open/shut. The base 10 turnably supports the driving ring 40 on the same side as the barrier blades 20 and 30, and is provided with regulating parts 11a and 15 regulating the movement of the driving ring 40 in the optical axis direction from a side antagonizing the external force. Thus, the deformation of the driving ring and the barrier blades is prevented, thereby attaining smooth action. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a lens barrier device for protecting a lens of a camera such as a digital still camera or a digital video camera, and in particular, the barrier blade is driven to open and close by a drive ring that rotates around the optical axis by an external force acting in the optical axis direction of the lens. The present invention relates to a lens barrier device.

A conventional lens barrier device that opens and closes the lens front surface of a camera includes a base having an opening, a drive ring that is rotatably supported on the front surface of the base, and a pair that is swingably supported on the base on the front surface of the drive ring. The one provided with the barrier blades and the like is known.
In this device, the drive ring is rotatably supported with respect to the base by a support shaft engaged with the inner peripheral edge thereof, and extends from the outer peripheral edge toward the rear in the optical axis direction. The guide bar (cam part) formed by bending is integrally provided. When the guide bar receives a pressing force (external force) in the optical axis direction, the drive ring rotates to close the barrier blade and release it from the pressing force. Then, the driving blade reversely rotates by the biasing force of the spring, so that the barrier blade is opened. (For example, refer to Patent Document 1).

Other lens barrier devices include a presser ring that holds the lens positioned at the forefront, a drive ring that is rotatably supported by the presser ring, a base that is disposed in front of the drive ring and has an opening, and a front surface of the base And a pair of barrier blades supported in a swingable manner, and a cover having an opening disposed forward so as to cover the barrier blades.
In this device, the drive ring is a drive that extends from the outer periphery of the drive ring toward the rear in the optical axis direction, extends forward in the optical axis direction so as to penetrate the base, and is connected to the barrier blade. When the cam part receives a pressing force (external force) in the optical axis direction, the drive ring rotates to close the barrier blade, and when released from the pressing force, the pin is driven by the spring biasing force. The ring rotates backward to open the barrier blades (see, for example, Patent Document 2).
JP 2000-47288 A JP 2002-40516 A

By the way, in a lens barrier device including a drive ring that is rotatably supported by a support shaft that engages with an inner peripheral edge, when the guide bar receives a pressing force in the optical axis direction, the pressing force is reduced in the vicinity of the guide bar. Since there is no receiving member, the drive ring may be pressed to bend in the optical axis direction, and further, the barrier blade may be pressed to be bent through the drive ring.
As described above, when the barrier blade or the drive ring bends in the optical axis direction, the barrier blade cannot be opened and closed smoothly.

  On the other hand, in the lens barrier device in which the drive ring is disposed behind the base and the barrier blade is disposed forward, the optical axis pressing force acting on the cam portion does not directly reach the barrier blade, but the drive pin in the optical axis direction. Therefore, a transmission loss occurs in the rotational driving force exerted on the barrier blade from the drive ring, and an efficient driving operation cannot be obtained.

  The present invention has been made in view of the above circumstances, and its object is to drive a barrier blade with a drive ring that converts an external force (for example, a pressing force) acting in the optical axis direction into a rotational driving force. It is an object of the present invention to provide a lens barrier device that can be smoothly opened and closed by reliably preventing the driving ring and barrier blades from being bent due to an external force while reducing the thickness and size of the lens barrier device.

  The lens barrier device of the present invention includes a base that is disposed in front of the lens in the optical axis direction and defines an opening, a barrier blade that is swingably provided with respect to the base and opens and closes the opening, and an optical axis direction And a drive ring that rotates around the optical axis by an external force acting on the barrier blade to open and close the barrier blade, and the base supports the drive ring rotatably on the same side as the barrier blade, and in the vicinity of receiving the external force And a restricting portion that restricts the drive ring from moving in the optical axis direction from the side that antagonizes the external force.

According to this configuration, when the drive ring receives an external force from the optical axis direction, the drive ring rotates around the optical axis to open and close the barrier blades. At this time, since the region in the vicinity of receiving the external force of the drive ring is restricted by the restricting portion from the side that antagonizes the external force (that is, the restricting portion receives the external force), the drive ring moves in the optical axis direction (for example, The drive ring rotates smoothly, and the barrier blades smoothly open and close without causing deformation. Further, since the drive ring is disposed on the same side as the barrier blade with respect to the base, the transmission distance in the optical axis direction when the rotational driving force of the drive ring is transmitted to the barrier blade can be shortened, and therefore It is possible to prevent a bending load or the like from being applied to the barrier blade.
In this way, smooth operation can be obtained by preventing deformation of the drive ring and barrier blade, and the drive ring and barrier blade are supported by a common base, so the drive ring is supported by a dedicated member. Compared with, the number of parts can be reduced, and the device can be made thinner and smaller.

In the above configuration, the drive ring includes an annular portion formed in an annular shape so as to be slidably supported by the base, an engaging portion that protrudes from the annular portion and engages with a part of the barrier blade, and an optical axis from the annular portion. The structure which has the back extension part which protrudes back in the direction and receives external force is employable.
According to this configuration, when the rear extension portion receives an external force, the drive ring rotates while the annular portion slides with respect to the base, and the engagement portion of the drive ring engages with a part of the barrier blade. Open and close the barrier blades. Thus, since the drive ring is supported in a state adjacent to the base, the drive ring can be supported in a stable state in combination with the action of the restricting portion.

In the above-described configuration, the barrier blade may employ a configuration having an engaged portion that engages with the engaging portion of the drive ring in the vicinity of the supported portion that is swingably supported with respect to the base. .
According to this configuration, the engagement portion of the drive ring engages with the engaged portion provided in the vicinity of the supported portion (swinging support shaft) of the barrier blade and exerts an opening / closing driving force. Of these, a driving force is not directly applied to a region away from the supported portion (a region for opening and closing the opening), and deformation such as bending and bending of the barrier blade can be prevented.

In the above configuration, the base may adopt a configuration including a cylindrical portion that protrudes forward in the optical axis direction and a through hole that passes through the rearward extension portion so as to slidably support the annular portion of the drive ring. it can.
According to this configuration, the drive ring is formed in a state in which the annular portion is fitted into the cylindrical portion of the base and is rotatably supported, and the rear extension portion protrudes rearward through the through hole. Therefore, the drive ring is supported in the radial direction (radial direction) by the cylindrical portion of the base, and can smoothly rotate around the optical axis in an angle range in which the through hole allows the movement of the rear extension portion.

In the above configuration, the restricting portion includes a first restricting piece projecting radially from the cylindrical portion to restrict the annular portion of the drive ring from moving in the optical axis direction, and a first restricting piece in the vicinity of the through hole. The structure containing the 2nd control piece provided in the position substantially opposed in radial direction is employable.
According to this configuration, in the drive ring, the inner peripheral edge region of the annular portion is restricted by the first restriction piece, and the outer peripheral edge region of the annular portion provided with the rearward extension portion is restricted by the second restriction piece. The movement in the optical axis direction is prevented, and the first restriction piece and the second restriction piece hold the annular portion so as to antagonize the external force applied to the rear extension portion, so that the drive ring is reliably deformed. To be prevented.

In the above configuration, a plurality of first restricting pieces are formed in the circumferential direction with a predetermined angular interval, and a second restricting piece is formed so as to substantially face at least one of the plurality of first restricting pieces. The configuration can be adopted.
According to this configuration, the annular portion of the drive ring is held substantially uniformly in the circumferential direction by the plurality of first restricting pieces, and the inclination thereof is prevented.

The said structure WHEREIN: The cyclic | annular part of a drive ring can employ | adopt the structure which has a 1st to-be-regulated part which formed the area | region where a 1st control piece engages thinly.
According to this configuration, since the length of the cylindrical portion can be shortened by the amount formed thin, the apparatus can be made thinner in the optical axis direction.

In the above configuration, a plurality of first restricted portions are formed in the circumferential direction so as to correspond to the plurality of first restricted pieces, and the annular portion of the drive ring is adjacent to the plurality of first restricted portions in the circumferential direction. It is possible to adopt a configuration having a plurality of notches that can be inserted through the corresponding first restricting pieces in the optical axis direction.
According to this configuration, in the optical axis direction, each notch is aligned with each first restriction piece, and the rear extension is aligned with the through hole, and the drive ring from the front in the optical axis direction. So that the annular portion is fitted into the cylindrical portion and at the same time the rear extending portion is inserted into the through hole, and each first restricting piece comes into contact with the corresponding first regulated portion. Only by rotating the drive ring by a predetermined angle so that the second restricting piece comes into contact with a part of the outer peripheral edge region of the annular portion, the drive ring can be rotatably assembled to the base.

  As described above, according to the lens barrier device of the present invention, the drive ring that rotates around the optical axis by the external force acting in the optical axis direction to open and close the barrier blade is located on the same side as the barrier blade with respect to the base. By providing a restricting part that supports the rotation of the drive ring and moves the drive ring in the optical axis direction from the side that antagonizes the external force in the vicinity of receiving the external force, the drive ring and the barrier blade can be deformed. As a result, smooth drive operation and opening / closing operation can be obtained, and the drive ring and barrier blades are supported by a common base, so the parts are compared to the case where the drive ring is supported by a dedicated member. The number of points can be reduced, and the device can be made thinner and smaller.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, exemplary embodiments of the invention will be described with reference to the accompanying drawings.
1 to 11 show an embodiment of a lens barrier device according to the present invention. FIG. 1 is an external perspective view of the device, FIG. 2 is an exploded perspective view of the device, and FIG. 3 is a perspective view showing a base. 4 is a perspective view showing the drive ring, FIGS. 5 and 6 are perspective views showing the barrier blade, FIG. 7 is a partial sectional view of the apparatus, and FIGS. 8 and 9 are views showing the state where the barrier blade is opened. FIG. 10 and FIG. 11 are plan views showing a state in which the barrier blade closes the opening.

  As shown in FIGS. 1 and 2, the lens barrier device includes a base 10 that defines an opening 10 a, first barrier blades 20 and second barrier blades that are swingable with respect to the base 10. The blade 30, the drive ring 40 that drives the barrier blades 20, 30 to open and close, the cover 50 that is connected to the base 10 so as to cover the barrier blades 20, 30 and that defines the opening 50 a, and the barrier blades 20, 30 are closed. Two springs 60 to be urged, and a spring 70 to urge the drive ring 40 so as to drive the barrier blades 20 and 30 in the opening direction are provided.

  As shown in FIGS. 2 and 3, the base 10 is formed in an annular shape so as to define a circular opening 10a using a resin material, and an inner peripheral surface of the opening 10a is formed on the front surface thereof. The cylindrical portion 11 that delimits and protrudes forward in the optical axis direction L, the arc-shaped guide path 12 that slidably guides the barrier blades 20 and 30, and the support that supports the barrier blades 20 and 30 so as to swing freely. The shaft 13, four first restricting pieces 11 a as restricting portions formed to protrude radially outward from the outer peripheral surface of the cylindrical portion 11, the through hole 14 that penetrates the base 10 in the optical axis direction L, and the edge of the through hole 14 A second restricting piece 15 as a restricting portion is provided so as to protrude toward the front in the optical axis direction L and project toward the through hole 14 in the vicinity of the portion.

  The base 10 also latches two latching protrusions 16 that latch one end 61 of a spring 60 that biases the barrier blades 20 and 30, and one end 71 of a spring 70 that biases the drive ring 40 in one direction. The latching projection 17, the pin 18 a for positioning the cover 50, the hole 18 b used for attachment to the lens barrel, etc., the four projections 19 for connecting the cover 50 by snap fit, and the like are provided.

The drive ring 40 is formed of a resin material. As shown in FIGS. 2 and 4, the drive ring 40 has an annular portion 41 formed in an annular shape so as to be slidably supported with respect to the base 10. Two engagements as an engaging part that protrudes radially outward from the annular part 41 and engages with part of the barrier blades 20 and 30, as a rearward extending part that protrudes rearward in the axial direction L The pieces 43a and 43b, the latch piece 44 for latching the other end 72 of the spring 70, the four notches 45 through which the restricting piece 11a passes when assembled to the base 10, and the notches 45 are formed adjacent to each other. There are provided four first restricted portions 46 whose dropout is restricted by one restriction piece 11a, one restricted piece 47 whose dropout is restricted by the second restriction piece 15, and the like.
Here, the first restricted portion 46 is a region where the first restricting piece 11 a is engaged, and is formed thinner than the other regions of the annular portion 41. Therefore, when the annular portion 41 of the drive ring 40 is fitted and supported on the cylindrical portion 11 of the base, the length of the cylindrical portion 11 can be shortened by the amount formed thinly. It can be made thinner.

As shown in FIG. 4, the cam portion 42 has a cam surface 42 a on the tip side. When this lens barrier device is attached to the tip of the lens barrel of the camera, for example, the engaging protrusion P provided on the camera side is engaged with the cam surface 42a as the lens barrel retracts. It comes to match.
That is, when an external force (pressing force) acting in the optical axis direction L is applied to the cam portion 42, the external force (pressing force) is converted into a rotational force around the optical axis through the cam action of the cam surface 42a. The drive ring 40 rotates in the direction of the arrow R2 around the optical axis against the biasing force of the spring 70 biased in the direction of the arrow R1.

  Here, among the plurality of first restriction pieces 11a formed on the base 10, one first restriction piece 11a and the second restriction piece 15 have through holes as shown in FIGS. 3 and 7B. 14 are formed at substantially opposite positions in the radial direction with 14 therebetween. Therefore, even if the cam portion 42 receives an external force (pressing force) F from the optical axis direction L, the first restricting piece 11a and the second restricting piece 15 are the first of the drive rings 40 formed in the vicinity of the cam portion 42. 1 Since the regulated portion 46 and the regulated piece 47 are pressed and regulated from the opposite side that antagonizes the external force F, the drive ring 40 (annular portion 41) is maintained in a flat plate shape without being bent.

  The first barrier blade 20 is formed in a thin plate shape with a resin material, and as shown in FIGS. 5 and 6, a supported portion 21 that is supported so as to be swingable through the support shaft 13 of the base 10. An engaged portion 22 that is formed in a cylindrical shape in the vicinity of the supported portion 21 and engages with an engagement piece 43a of the drive ring 40, a linear contact end surface 23, and a direction perpendicular to the contact end surface 23 (optical axis) Facing surface 24 continuously formed with a surface in the direction L), fitting convex portion 25 formed near the tip, and fitting concave portion formed near the supported portion 21 supported by the support shaft 13 26, a sliding piece 27 and the like sliding on the guide path 12 of the base 10 are provided.

  The second barrier blade 30 is formed of a resin material in a thin plate shape, and as shown in FIGS. 5 and 6, a supported portion 31 that is swingably supported through the support shaft 13 of the base 10. An engaged portion 32 that is formed in a columnar shape in the vicinity of the supported portion 31 and engages with an engagement piece 43b of the drive ring 40, a linear contact end surface 33, and a direction perpendicular to the contact end surface 33 (optical axis) Facing surface 34 continuously formed with a surface in the direction L), fitting convex portion 35 formed near the tip, and fitting concave portion formed near the supported portion 31 supported by the support shaft 13 36, a sliding piece 37 that slides on the guide path 12 of the base 10 is provided.

Here, as shown in FIG. 6, when the first barrier blade 20 and the second barrier blade 30 come close to each other and join to close the openings 10 a and 50 a, the fitting convex portion 25 of the first barrier blade 20. Is fitted into the fitting recess 36 of the second barrier blade 30, and the fitting projection 35 of the second barrier blade 30 is fitted into the fitting recess 26 of the first barrier blade 20.
Further, since the contact end surface 23 and the facing surface 24 and the contact end surface 33 and the facing surface 34 have complementary shapes that mesh with each other, the contact end surfaces 23 and 33 come into contact with each other at the same time. , 34 face each other in contact with each other in the optical axis direction L.
Accordingly, the first barrier blade 20 and the second barrier blade 30 are securely positioned so as not to cause a step in the optical axis direction L in the closing operation, and at the same time, the openings 10a and 50a are securely connected. It is shielded and can prevent light or dust from entering from the outside.

  In the barrier blades 20 and 30, the engaged portions 22 and 32 with which the engagement pieces 43 a and 43 b of the drive ring 40 are engaged are provided in the vicinity of the supported portions 21 and 31. The rotational driving force exerted by the engagement pieces 43a and 43b is not applied to the region (region for opening and closing the opening) away from the supported portions 21 and 31, and the barrier blades 20 and 30 are deformed such as bending and bending. Can be prevented.

  As shown in FIGS. 1 and 2, the cover 50 is formed in a disk shape from a resin material. The cover 50 has a substantially rectangular opening 50 a at the center thereof, and is directed rearward in the optical axis direction L from the outer periphery. A latch piece 51 snap-fitted to the protrusion 19 of the extended base 10, two positioning holes 52 through which the pins 18a of the base 10 pass, two circular holes 53 corresponding to the holes 18b of the base 10, and a small diameter at the tip of the support shaft 13 Two circular holes 54 and the like into which the portion 13a is fitted are provided. The cover 50 defines a blade chamber that accommodates the barrier blades 20 and 30 in cooperation with the base 10.

  As shown in FIGS. 2 and 7A, the spring 60 is a torsion type spring, and is arranged around the supported portions 21 and 31, and one end 61 of the spring 60 is hooked on the hooking protrusion 16 of the base 10. The other end 62 is hooked to the engaged portions 22 and 32 of the barrier blades 20 and 30 from the side opposite to the engaging pieces 43a and 43b. Thereby, the spring 60 always urges the first barrier blade 20 and the second barrier blade 30 in the closing direction.

As described above, in the configuration including the base 10, the drive ring 40, the barrier blades 20, 30, the cover 50, etc., the drive ring 40, the barrier blades 20, 30, the cover 50 are sequentially arranged on the front side of the base 10, that is, on the same side. Are arranged close to each other, and the drive ring 40 and the barrier blades 20 and 30 are supported with respect to the base 10 so as to be rotatable and swingable.
Therefore, as shown in FIG. 7A, the transmission distance D in the optical axis direction L when the rotational driving force of the drive ring 40 is transmitted to the barrier blades 20 and 30 can be shortened. It is possible to prevent a bending load or the like from being applied to 30.
Thereby, the driving ring 40 and the barrier blades 20 and 30 are prevented from being deformed and the like, and a smooth operation is obtained. Further, since the driving ring 40 and the barrier blades 20 and 30 are supported by the common base 10, the driving ring Compared to the case where 40 is supported by a dedicated member, the number of parts can be reduced, and the apparatus can be made thinner and smaller.

  Next, the procedure for assembling this apparatus will be described. First, as shown in FIG. 2, with respect to the base 10, each notch 45 is aligned with each first restricting piece 11a, and the cam 42 is aligned with the through hole 14, The drive ring 40 is brought close to the base 10 from the front in the optical axis direction L, and the annular portion 41 is fitted into the cylindrical portion 11 and at the same time, the cam portion 42 is inserted into the through hole 14.

  When the drive ring 40 contacts the sliding surface 10b of the base 10 and rotates the drive ring 40 clockwise (in the direction of the arrow R2) by a predetermined angle, as shown in FIG. 10 first restricting pieces 11 a and second restricting pieces 15 are slidably engaged with the first restricted portions 46 and the restricted pieces 47 of the drive ring 40, so that the drive ring 40 is forward in the optical axis direction L. Regulating falling out towards As a result, the drive ring 40 is assembled to the base 10 so as to be rotatable.

  Subsequently, the barrier blades 20 and 30 are brought close to the base 10 from the front in the optical axis direction L in a state where the springs 60 are fitted on the outer circumferences of the supported portions 21 and 31, and the base 10 is placed on the supported portions 21 and 31. The one end 61 of the spring 60 is hooked to the hooking protrusion 16 and the other end 62 is hooked to the engaged portions 22 and 32. Further, one end 71 of the spring 70 is latched to the latching protrusion 17 of the base 10, and the other end 72 is latched to the latching piece 44 of the drive ring 40.

  Thereafter, the cover 50 is brought closer to the base 10 from the front in the optical axis direction L, the tip small-diameter portion 13a of the support shaft 13 and the pin 18a are passed through the circular holes 52 and 54, and the latching piece 51 is latched to the protrusion 19. And connect by snap fit. Thereby, the assembly of the lens barrier device as shown in FIG. 1 is completed.

  Next, the operation of this apparatus will be described with reference to FIGS. For convenience of explanation, the cover 50 is omitted in FIGS. 8 and 10 (only the opening 50a is indicated by a two-dot chain line), and the cover 50 is omitted in FIGS. 9 and 11 (only the opening 50a is indicated by a two-dot chain line). In addition, the barrier blades 20, 30, etc. are indicated by two-dot chain lines.

  First, in a state where the cam portion 42 of the drive ring 40 does not receive a pressing force (external force) from the engagement protrusion P or the like on the camera side, the drive ring 40 is urged by the spring 70 to the counterclockwise rotation end. To position. At this time, as shown in FIGS. 8 and 9, the first barrier blade 20 and the second barrier blade 30 have the engaged portions 22, 32 against the biasing force of the spring 60, while the drive ring 40. Pushed by the engaging pieces 43a and 43b, the cover 50 is located at the open position where the opening 50a is fully opened.

From this state, the cam portion 42 of the drive ring 40 receives a pressing force (external force) by the engagement protrusion P or the like on the camera side, and the drive ring 40 resists the biasing force of the spring 70 and rotates clockwise by a predetermined angle. When rotating, the engagement pieces 43 a and 43 b of the drive ring 40 retreat from the engaged portions 22 and 32 of the barrier blades 20 and 30, and at the same time, the first barrier blade 20 and the second barrier blade by the biasing force of the spring 60. 30 rotates counterclockwise and performs a closing operation.
In this closing operation, the barrier blades 20 and 30 are free of rattling or the like in the optical axis direction L because the sliding pieces 27 and 37 are guided along the guide path 12. As a result, the closing operation is performed smoothly and stably.

  Then, as shown in FIGS. 10 and 11, the fitting convex portion 25 of the first barrier blade 20 is fitted into the fitting concave portion 36 of the second barrier blade 30, and the fitting convex portion 35 of the second barrier blade 30. Is fitted into the fitting recess 26 of the first barrier blade 20, and the contact end surface 23 of the first barrier blade 20 contacts the contact end surface 33 of the second barrier blade 30. The surface 24 opposes in the state which contacted the opposing surface 34 of the 2nd barrier blade 30. FIG.

  In this way, the fitting convex portions 25 and 35 are fitted into the fitting concave portions 26 and 36, respectively, so that the first barrier blade 20 and the second barrier blade 30 do not cause a step in the optical axis direction L. In this state, the opening 50a is closed after being positioned at the same position. Further, since the contact end surfaces 23 and 33 come into contact with each other and are reliably shielded, and the opposing surfaces 24 and 34 face each other in the optical axis direction L perpendicular to the contact end surfaces 23 and 33, light or dust from the outside And the like are reliably prevented.

  As described above, according to this device, the region in the vicinity of receiving the external force of the drive ring 40 is restricted by the first restriction piece 11a and the second restriction piece 15 as restriction parts from the side that antagonizes the external force. The drive ring 40 is not displaced or displaced in the optical axis direction L, the drive ring 40 is smoothly rotated, and the barrier blades 20 and 30 are smoothly opened and closed without deformation. Do.

Further, since the drive ring 40 is disposed on the same side as the barrier blades 20 and 30 with respect to the base 10, the transmission distance when the rotational driving force of the drive ring 40 is transmitted to the barrier blades 20 and 30 is increased. It becomes short and it can prevent that the bending load etc. are added to the barrier blades 20 and 30.
As described above, the drive ring 40 and the barrier blades 20 and 30 are prevented from being deformed and the like, and a smooth operation can be obtained, and the drive ring 40 and the barrier blades 20 and 30 are supported by the common base 10. The number of points can be reduced, and the device can be made thinner and smaller.

In the above embodiment, the two barrier blades 20 and 30 are shown as the barrier blades. However, the present invention is not limited to this, and the configuration of the present invention may be adopted in one or more barrier blades. Good.
In the above embodiment, the engagement pieces 43a and 43b projecting radially outward are shown as the engagement portions of the drive ring 40, and the engagement portions 22 and 32 of the barrier blades 20 and 30 are projected in the optical axis direction L. However, the present invention is not limited to this, and adopts a pin protruding in the optical axis direction as the engaging portion of the drive ring 40, and as the engaged portion of the barrier blades 20, 30, The configuration of the present invention may be employed in a configuration that employs a long hole through which a pin passes.

  In the above embodiment, the engagement protrusion P on the camera side is shown as an external force acting on the drive ring 40 in the optical axis direction L. However, the present invention is not limited to this. The configuration of the present invention may be adopted in a configuration in which the drive ring is rotated around the optical axis by directly applying an external force in the optical axis direction with a hand.

  As described above, the lens barrier device according to the present invention is not limited to a camera equipped with a retractable lens barrel as long as it is disposed on the front surface of the lens and protects the lens, and other digital still cameras, It can also be used in digital video cameras, silver salt film cameras, and the like.

1 is an external perspective view showing an embodiment of a lens barrier device according to the present invention. It is a disassembled perspective view of the lens barrier apparatus shown in FIG. It is a perspective view which shows the base which makes a part of lens barrier device. It is a perspective view which shows the drive ring which makes a part of lens barrier apparatus. It is a perspective view which shows the state which the barrier blade | wing opened the opening part. It is a perspective view which shows the state which the barrier blade closed the opening part. FIG. 2 shows the relationship between a base, a drive ring, a barrier blade, a cover and the like constituting a lens barrier device, (a) is a sectional view showing the vicinity of a supported portion of the barrier blade, and (b) is a cam portion of the drive ring. FIG. It is a top view which shows the state which the barrier blade | wing opened the opening part. It is a top view which shows the state which the barrier blade | wing opened the opening part. It is a top view which shows the state which the barrier blade closed the opening part. It is a top view which shows the state which the barrier blade closed the opening part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Base 10a Opening part 10b Sliding surface 11 Cylindrical part 11a 1st control piece (control part)
13 Support shaft 14 Through hole 15 Second restriction piece (restriction part)
20 first barrier blade 21 supported portion 22 engaged portion (part of barrier blade)
30 Second barrier blade 31 supported portion 32 engaged portion (part of barrier blade)
40 Drive ring 41 Annular part 42 Cam part (rear extension part)
43a, 43b engagement piece (engagement part)
45 Notch portion 46 First restricted portion 47 Restricted piece 50 Cover 50a Openings 60, 70 Spring L Optical axis direction

Claims (8)

Light is generated by a base that is disposed in front of the optical axis of the lens and defines an opening, a barrier blade that is swingable with respect to the base and opens and closes the opening, and an external force that acts in the direction of the optical axis. A drive ring that rotates about an axis to open and close the barrier blade, and
The base rotatably supports the drive ring on the same side as the barrier blade, and restricts the drive ring from moving in the optical axis direction from the side that antagonizes the external force in the vicinity of receiving the external force. Having a regulation part to
A lens barrier device. The drive ring includes an annular portion formed in an annular shape so as to be slidably supported by the base, an engaging portion protruding from the annular portion and engaging a part of the barrier blade, and light from the annular portion. A rear extension portion that protrudes rearward in the axial direction and receives the external force,
The lens barrier device according to claim 1. The barrier blade has an engaged portion that engages with an engaging portion of the drive ring in the vicinity of a supported portion that is swingably supported with respect to the base.
The lens barrier device according to claim 2. The base includes a cylindrical portion that protrudes forward in the optical axis direction to slidably support the annular portion of the drive ring, and a through hole that passes through the rearward extension portion.
The lens barrier device according to claim 1, wherein the lens barrier device is a lens barrier device. The restricting portion includes a first restricting piece projecting in a radial direction from the cylindrical portion to restrict the annular portion of the drive ring from moving in the optical axis direction, and the first restricting piece in the vicinity of the through hole. And a second restricting piece provided at a position substantially opposite in the radial direction,
The lens barrier device according to any one of claims 1 to 4, wherein the lens barrier device is provided. A plurality of the first restricting pieces are arranged in the circumferential direction at a predetermined angular interval;
The second restriction piece is formed so as to substantially face at least one of the plurality of first restriction pieces.
The lens barrier device according to claim 5. The annular portion of the drive ring has a first restricted portion in which a region where the first restricting piece is engaged is formed thin.
The lens barrier device according to claim 5, wherein the lens barrier device is a lens barrier device. A plurality of the first restricted portions are formed in the circumferential direction so as to correspond to the plurality of first restriction pieces,
The annular portion of the drive ring has a plurality of cutout portions that are formed adjacent to the plurality of first regulated portions in the circumferential direction and can respectively pass through the corresponding first regulating pieces in the optical axis direction. ,
The lens barrier device according to claim 7.

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