JP2012093611A - Lens cap, lens barrel using the lens cap, and imaging device using the lens barrel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lens cap that can serve to enhance the function of absorbing and easing impacts.SOLUTION: A lens cap 18 comprises an internal covering member attachable to and detachable from a movable lens tube 10 held by an external member 7 to be able to move out of and be housed in the optical axis direction; and an external covering member 20 that is able to reciprocate in the optical axis direction relative to the internal covering member 19 while covering the internal covering member 19, whose tip opposes the tip of the external member 7 at the time of housing the movable lens tube 10 with a gap H in the optical axis direction in-between and, moreover, that is displaced, when an external force F arises in the direction of narrowing the gap H in the optical axis direction, in the direction of narrowing the gap H in the optical axis direction to cause its tip to come into contact with tip of the external member 7.

Description

  The present invention relates to a lens cap having an impact mitigating function, a lens barrel having the lens cap, and an improvement of an imaging apparatus using the lens barrel.

  2. Description of the Related Art Conventionally, a lens barrel of a camera as an imaging device has a configuration in which a movable barrel is extended when used with respect to a fixed barrel as an exterior member, and is stored in a fixed barrel when not in use. ing.

  In addition, there is also known a configuration in which a lens cap is brought into contact with an exterior member when the movable lens barrel is stored, thereby preventing an impact due to an external force from being directly applied to the movable lens barrel (see, for example, Patent Document 1). ).

  However, in the conventional configuration, when an external force is applied to the lens cap due to an impact, the external force transmitted to the movable lens barrel may not be absorbed and relaxed, and there is room for improvement in terms of improving the impact absorbing and mitigating function.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a lens cap capable of further improving the shock absorption relaxation function, a lens barrel using the lens cap, and An object of the present invention is to provide an imaging apparatus using the lens barrel.

  The lens cap and the lens barrel according to the present invention can be attached to an inner cover member that covers the inner cover member while being detachable from a movable lens barrel that is held by the exterior member so as to be advanced and retractable in the optical axis direction. On the other hand, an external force that can reciprocate in the optical axis direction and opens a gap in the optical axis direction with respect to the distal end portion of the exterior member when the movable barrel is retracted, so that the distal end portion faces and the gap in the optical axis direction is reduced. And an outer cover member that is displaced in a direction in which the gap in the optical axis direction becomes smaller when the occurrence occurs, and the tip portion contacts the tip portion of the exterior member.

It is desirable that an elastic member that elastically urges the cover members in a direction to separate the cover members is interposed between the inner cover member and the outer cover member.
The elastic member is preferably a spring spring, but may be a leaf spring, and the spring may be made of metal or resin.

The movable lens barrel is formed with a thread groove into which an optical element such as an optical filter is screwed, and the inner cover member is urged away from each other, and the screw of the movable lens barrel is attached to the movable lens barrel when attached to the movable lens barrel. It is good also as a structure which has a pair of engaging claw member engaged with a groove | channel.
It is desirable that the maximum possible size of contraction deformation due to the external force of the elastic member is equal to or greater than the size of the gap in the optical axis direction.

  An attachment ring member having a thread groove for detachably screwing the optical element on the movable barrel is provided on the inner peripheral portion via the pressing ring member, and the inner cover member is urged in a direction away from each other and is movable mirror It is good also as a structure which provides a pair of engaging claw member engaged with this movable lens-barrel at the time of mounting | wearing to a cylinder, and engages this pair of engaging claw member with a screw groove.

An adapter mounting mount member is provided on the movable lens barrel via a holding ring member, and a hook portion for locking a concealing ring cap member that conceals the gap between the adapter mounting mount member and the adapter is provided. The inner cover member is provided with a pair of engaging claw members that are urged away from each other and engage with the movable lens barrel when mounted on the movable lens barrel. It is good also as a structure engaged with a hook part.
The lens cap and the lens barrel are used in an imaging device.

  According to the lens cap and the lens barrel of the present invention, the inner cover member that can be attached to and detached from the movable lens barrel that is held so as to be able to advance and retract in the optical axis direction on the exterior member, and the inner cover while covering the inner cover member A direction that can reciprocate in the optical axis direction with respect to the member, and a direction in which the front end portion faces the front end portion of the exterior member when the movable lens barrel is retracted and the front end portion faces and the clearance in the optical axis direction decreases. Since the lens cap is constituted by the outer cover member that is displaced in a direction in which the gap in the optical axis direction is reduced when the external force is generated and the front end portion comes into contact with the front end portion of the exterior member, the external force due to the impact is directly movable mirror It can be surely eased to join the tube.

  Further, since the external force due to the impact that cannot be absorbed by the displacement of the outer cover member in the optical axis direction is absorbed by the exterior member that is in contact with the outer cover member, the impact absorption mitigating function can be improved.

  If an elastic member is provided between the inner cover member and the outer cover member to elastically urge the cover members in the direction to separate them, the displacement of the outer cover member in the optical axis direction due to external force is elastically deformed. Since it can be reliably converted into energy, the impact can be further reduced.

  Further, since the outer cover member and the inner cover member are relatively displaceable in the optical axis direction and a gap is always formed between the distal end portion of the outer cover member and the distal end portion of the exterior member during storage, the lens cap is attached. Even if it is left attached, it is possible to avoid problems when the movable lens barrel is driven.

FIG. 1 is an external view of a camera as an imaging device to which a lens cap and a lens barrel according to the present invention are applied, and is an explanatory diagram showing a retracted state of a movable lens barrel when the lens cap is not attached. FIG. 2 is an external view of a camera as an image pickup apparatus to which the lens cap and the lens barrel according to the present invention are applied, and is an explanatory view showing the advancing state of the movable lens barrel when the lens cap is not attached. FIG. 3 is an external view of a camera as an imaging apparatus to which the lens cap and the lens barrel according to the present invention are applied, and is an explanatory diagram showing a retracted state of the movable lens barrel when the lens cap is attached. FIG. 4 is a longitudinal sectional view showing an example of a camera to which the lens cap according to the present invention is attached, and is a longitudinal sectional view showing a retracted state of the movable lens barrel when the lens cap is not attached. FIG. 5 is an enlarged view of the lens cap shown in FIG. 3, and is an external view of the lens cap as viewed from the front side of the camera. FIG. 6 is an external view of the lens cap shown in FIG. 5 viewed from the back side. FIG. 7 is an external view showing a state where the outer cover shown in FIG. 5 is removed and the inner cover member is visually observed. FIG. 8 is a cross-sectional view for explaining the fitting relationship between the inner cover member and the outer cover member of the lens cap shown in FIGS. 5 and 6 and shows a state before external force due to impact is applied to the outer cover. FIG. FIG. 9 is a cross-sectional view showing a state in which an external force due to an impact is applied to the outer cover shown in FIG. FIG. 10 is a partially enlarged cross-sectional view showing an enlarged front portion of the lens barrel shown in FIG. FIG. 11 is a partially enlarged cross-sectional view of the front portion of the lens barrel showing the engagement relationship between the pair of engaging claw members and the movable lens barrel shown in FIG. FIG. 12 is a partially enlarged cross-sectional view of the front portion of the lens barrel for explaining the operation of the lens cap according to the present invention, and shows the lens barrel and the lens cap when no external force is applied to the lens cap. It is explanatory drawing. FIG. 13 is a partial enlarged cross-sectional view of the front portion of the lens barrel for explaining the operation of the lens cap according to the present invention, and shows the lens barrel and the lens cap when an external force is applied to the lens cap. FIG. 14 is a partially enlarged cross-sectional view of the leading portion of the lens barrel showing another example of the engagement relationship between the pair of engaging claw members and the movable lens barrel shown in FIG.

Embodiments of a lens cap and a lens barrel according to the present invention will be described below with reference to the drawings.
1 to 3 are external views of a camera as an imaging apparatus to which a lens cap and a lens barrel according to the present invention are applied.

(Explanation of camera appearance)
FIG. 1 is an external view of the camera when the lens cap is not attached, and is an explanatory view showing a retracted state of the movable lens barrel. FIG. 2 is an external view of the camera when the lens cap is not attached. FIG. 3 is an explanatory view showing the advanced state of the movable lens barrel shown in FIG. 1, and FIG. 3 is an external view of the camera showing a state where a lens cap is attached to the movable lens barrel shown in FIG.

  1 to 3, reference numeral 1 denotes a camera. The camera 1 includes a camera body 2 and a lens unit 3. The lens unit 3 can be attached to and detached from the camera body 2.

  The camera body 2 is provided with a liquid crystal display (not shown) on the back thereof. Various buttons such as a power button 4, a release button 5, a mode dial switch 6, a switch member, A strobe device is provided.

(Schematic configuration of the internal structure of the lens unit)
The lens unit 3 has an exterior member 7. As shown in FIGS. 4, 10 to 13, the exterior member 7 is generally configured by an outer cylinder member 8, a fixed cylinder member 9, and a front ring member 13. Inside the fixed cylinder member 9, a rectilinear cylinder member 10 as a movable barrel is provided. The straight cylindrical member 10 is provided with a lens holding frame member 11. A lens group 12 is held by the lens holding frame member 11. The straight cylinder member 10 is held so as to be able to advance and retract in the optical axis direction with respect to the fixed cylinder member 9.

  As shown in FIGS. 1 to 4 and FIGS. 10 to 12, a front ring member 13 is provided on the outer peripheral portion of the distal end of the fixed cylinder member 9. A mounting ring member 14 is provided on the rectilinear cylinder member 10. An annular screw groove 15 is provided on the inner periphery of the mounting ring member 14.

The front ring member 13 is formed so as to protrude from the head portion of the attachment ring member 14 toward the subject side.
The attachment ring member 14 is fixed to the rectilinear cylinder member 10 by a pressing ring member 16. In FIGS. 1 and 2, reference numeral 17 denotes a fixing screw for fixing the mounting ring member 14 to the rectilinear cylinder member 10.

  An optical filter (not shown) as an optical element can be detachably screwed into the annular screw groove 15. A lens cap 18 is detachably attached to the subject-side tip of the annular screw groove 15 as shown in FIG.

(Configuration of lens cap 18)
5 to 7 are explanatory views showing the detailed configuration of the lens cap 18. FIG. 5 is an external view of the lens cap 18 viewed from the front side of the camera, and FIG. 6 shows the lens cap 18 shown in FIG. FIG. 7 is an external view as seen from the back side, FIG. 7 is an external view showing a state where the outer cover shown in FIG. 5 is removed, and FIGS. 8 and 9 are cross-sectional views of the lens cap shown in FIGS.
The lens cap 18 includes an inner cover member 19 shown in FIGS. 6, 7 to 9, 12, and 13, and an outer cover member 20 shown in FIGS. 5, 8, 9, 11 to 13. Has been.

As shown in FIG. 5, the outer cover member 20 includes a pair of fan-shaped decorative cover portions 20a and 20a each having an outer peripheral portion 20c having an arcuate appearance, and a pair of decorative covers extending in the diameter direction. It is comprised from the connection cover part 20b for a decoration which connects the part 20a and 20a.
Between the pair of decorative cover portions 20a, 20a and the decorative connecting cover portion 20b, there is a pair of guide spaces 21 for guiding engaging claw members to be described later in opposite directions.
The pair of guide spaces 21 are open in directions orthogonal to the direction in which the decorative connecting cover portion 20b extends and in directions opposite to each other.

As shown in FIG. 6, the inner cover member 19 is generally configured by a main body plate portion 22 and a pair of engaging claw members 23.
The main body plate portion 22 has a shape corresponding to the outer cover member 20, and as shown in FIG. 7, a pair of fan-shaped concealing cover portions 22a having a shape corresponding to the pair of decorative cover portions 20a and 20a, 22a, a connecting bridge portion 22b having a shape corresponding to the decorative connecting cover portion 20b, and a disposing plate portion 22c (see FIG. 6) on which a pair of engaging claw members 23 are provided.

As shown in FIG. 7, each of the pair of concealment cover portions 22a and 22a is formed with a pair of screw holes 23 ', a guide tube 24, and an elastic member disposing recess 25. A spring coil 26 as an elastic member is disposed in the recess 25 for disposing the elastic member.
The guide cylinder 24 and the elastic member disposing recess 25 are provided close to each other between the pair of screw holes 23 '.

  The pair of concealment cover portions 22a and 22a are located apart from each other in the optical axis direction in a state where the inner cover member 19 is attached to the rectilinear cylinder member 10. The pair of concealing cover portions 22a and 22a have a pair of guide wall portions 27 as constituent walls extending in a direction orthogonal to the connecting bridge portion 22b and facing each other.

  A guide space corresponding to the guide space 21 for guiding each engaging claw member 23 is formed by the guide wall portion 27 as the pair of constituent walls, the constituent wall of the connecting bridge portion 22b, and the arrangement plate portion 22c. . Guide piece portions 28 are formed in the pair of guide wall portions 27 at appropriate intervals in the extending direction. The concealing cover portions 22a and 22a are covered with the decorative cover portion 20a with the outer cover member 20 attached to the inner cover member 19, and the connecting bridge portion 22b is covered with the decorative connecting cover portion 20b.

  As shown in FIG. 7, the pair of engaging claw members 23 includes a base portion 23a, a pair of rib portions 23b integrated with the base portion 23a, a knob plate portion 23c integrated with the base portion 23a, and a base portion 23a. And the decorative concealing curved portion 23d, and the decorative concealing curved portion 23d and the engaging piece portion (see FIG. 11) 23e integral with the decorative concealing curved portion 23d.

The pair of base portions 23a are located on opposite sides of the connecting bridge portion 22b with the connecting bridge portion 22b interposed therebetween. The pair of ribs 23b are slidably contacted with the guide wall portion 27 and the guide piece portion 28. ing.
The knob plate portion 23c is erected in the outer direction from the base portion 23a toward the decorative connecting cover portion 20b along the decorative connecting cover portion 20b shown in FIGS.

The knob plate portion 23 c is used to operate the pair of engaging claw members 23 in the opposite direction with respect to the separating direction of the pair of engaging claw members 23.
As shown in FIGS. 8, 9, and 11, an engagement groove 23 f that engages with the tip of the annular screw groove 15 is formed on the outer periphery of the locking piece portion 23 e.

As shown in FIGS. 7 and 11, the pair of base portions 23 a is provided with an arrangement recess 23 g for arranging an elastic member.
As shown in FIGS. 7 and 11 to 13, a spring coil 29 as an elastic member is provided in the arrangement recess 23 g. As shown in FIG. 11, the pair of base portions 23a are provided with mounting projections 23h that project toward the arrangement recesses 23g and 23g.

As shown in FIGS. 7 and 11, an insertion space 30 through which the spring coil 29 is inserted is formed in the connecting bridge portion 22b. One side of the spring coil 29 is mounted on one mounting protrusion 23h, and the other side of the spring coil 29 is mounted on the other mounting protrusion 23h.
The pair of base portions 23 a is elastically biased by the spring coil 29 in a direction away from each other.

  As shown in FIGS. 8 and 9, the outer cover member 20 is formed with a screw mounting cylinder portion 31 at a position facing the screw hole 23 ′ of the inner cover member 19, and faces the guide cylinder 24 of the inner cover member 19. A guide protrusion 32 is formed at a place to be performed. A positioning projection 33 of the spring coil 26 is formed at a position of the inner cover member 19 facing the recess 25 for disposing the elastic member.

As shown in FIG. 6, the outer cover member 20 is formed with a stopper portion 34 that engages with the tip 23i of the rib 23b.
The inner cover member 19 and the outer cover member 20 are fixed by screw members 35 as shown in FIGS.

  When the inner cover member 19 and the outer cover member 20 are fastened, the pair of engaging claw members 23 project in the opposite directions from the outer peripheral portion 20c of the outer cover member 20 based on the elastic biasing force of the spring coil 29. The amount is regulated by the stopper portion 34.

  The inner cover member 19 and the outer cover member 20 are elastically biased by a spring coil 26 in a direction away from each other in the optical axis direction. The outer cover member 20 can reciprocate in the optical axis direction with respect to the inner cover member 19 while being guided by the guide tube 24.

  As shown in FIG. 3, the pair of engaging claw members 23 are surrounded by the pair of decorative cover portions 20a and 20a and the decorative connecting cover portion 20b of the outer cover member 20, and each knob plate portion 23c. The distal end portion 23c ′ is structured so as not to protrude outward in the optical axis direction from the decorative connecting cover portion 20b in a state in which the lens cap 18 is attached to the rectilinear cylinder member 10.

(Removal / attachment of the lens cap 18 to the rectilinear tube member 10)
The mounting of the lens cap 18 on the lens barrel will be described below.
First, a pair of knob plate portions 23c shown in FIG. 7 is picked with a finger, and a force is applied in a direction in which the pair of engaging claw members 23 approach each other against the elastic urging force of the spring coil 29. In this state, the lens cap 18 is directed to the straight cylindrical member 10 of the lens barrel shown in FIG. 11 so that the engaging groove 23f of the locking piece 23e faces the annular screw groove 15 of the mounting ring member 14.

  Next, when the force applied to the pair of knob plate portions 23c is loosened, the trough and the crest of the engagement groove 23f of the locking piece portion 23e are changed to the crest and trough of the annular screw groove 15 by the elastic biasing force of the spring coil 29. I bite into. Thereby, the lens cap 18 is attached to the rectilinear cylinder member 10.

  When the lens cap 18 is removed from the rectilinear cylinder member 10, the pair of knob plates 23 c are picked up with fingers and a force is applied in a direction approaching each other against the elastic biasing force of the spring coil 29, so that the locking piece 23 e The biting between the engagement groove 23f and the annular screw groove 15 of the attachment ring member 14 may be released.

(Operation of the front ring member 13)
FIG. 10 is a partially enlarged view showing the retracted state of the rectilinear cylinder member 10 with the lens cap 18 removed from the lens barrel.
In the state shown in FIG. 10, the front ring member 13 protrudes from the attachment ring member 14 toward the subject side in the optical axis direction.

  Therefore, even if the camera 1 falls for some reason and the head part of the lens barrel hits the floor, for example, it is avoided that the impact at the time of dropping is applied to the front ring member 13 and applied to the mounting ring member 14. The Therefore, it is avoided that an impact force is directly applied to the rectilinear cylinder member 10.

(Operation of the lens cap 18)
Next, the action when an impact is applied to the lens cap 18 in a state in which the lens cap 18 according to the present invention is mounted on the lens barrel and the linear tube member 10 is stored in the fixed tube member 9 will be described with reference to FIGS. 9, description will be made with reference to FIGS.

  FIGS. 12 and 13 are partially enlarged views showing a state in which the lens cap 18 is attached to the lens barrel and the straight cylinder member 10 is stored in the fixed cylinder member 9, and FIGS. FIG. 9 and FIG. 13 show a state in which an external force F in the optical axis direction is applied to the lens cap 18 due to the impact.

  In a state where no external force is applied to the lens cap 18 from the optical axis direction toward the lens barrel, the distal end of the outer peripheral portion 20c of the outer cover member 20 is stored in the state in which the straight cylinder member 10 is stored in the fixed cylinder member 9. A gap H in the optical axis direction is generated between the portion 20 c ′ and the front end portion 13 a of the front ring member 13.

  That is, the outer peripheral portion 20c of the outer cover member 20 covers the inner cover member 19 and can be reciprocated in the optical axis direction. Further, when the rectilinear cylinder member 10 is stored, the outer side portion 20c is a front side that constitutes a part of the exterior member 7 of the rectilinear cylinder member 10 The ring member 13 faces the gap H in the optical axis direction.

  Therefore, when an external force F in the optical axis direction due to an impact is applied to the lens cap 18 for some reason, the outer cover member 20 is displaced in the direction of narrowing the gap H against the elastic urging force of the spring coil 26. At this time, since the spring coil 26 contracts and deforms, the impact force is absorbed by the spring coil 26.

  When an impact that cannot be completely absorbed by the spring coil 26 is applied, as shown in FIG. 13, the optical axis direction between the distal end portion 20 c ′ of the outer peripheral portion 20 c of the outer cover member 20 and the distal end portion 13 a of the front ring member 13. The gap H disappears, and the tip 20c ′ of the outer peripheral portion 20c comes into contact with the tip 13a of the front ring member 13.

Therefore, the application of the external force F due to direct impact to the inner cover member 19 is mitigated, and the straight cylinder member 10 as a precision member is prevented from being damaged.
In this case, as shown in FIG. 8, it is desirable that the maximum dimension h of shrinkage deformation in the optical axis direction due to the external force F of the spring coil 26 is equal to or larger than the gap H.

  Furthermore, in this embodiment, as shown in FIG. 11, the distal end portion 23 c ′ of the knob plate portion 23 c of the pair of engaging claw members 23 is configured not to protrude from the decorative connecting cover portion 20 b of the outer cover member 20. Therefore, even if an external force F in the optical axis direction due to an impact is applied to the lens cap 18 for some reason, it is avoided that the external force F in the optical axis direction is directly applied to the pair of engaging claw members 23. The straight tube member 10 is reliably prevented from being damaged.

  Particularly, in this embodiment, even after the maximum displacement toward the inner cover member 19 due to the external force F of the outer cover member 20 shown in FIG. Since it does not protrude outward in the optical axis direction from the decorative connecting cover portion 20b of the outer cover member 20, it is reliably avoided that the external force F is directly applied to the rectilinear cylinder member 10.

(Effect of Example)
According to the lens cap 18 and the lens barrel according to this embodiment, the inner cover member 19 that can be attached to and detached from the rectilinear cylinder member 10 that is held in the exterior member 7 so as to be advanced and retractable in the optical axis direction, and the inner cover member. 19 can be reciprocated in the optical axis direction with respect to the inner cover member 19, and when the rectilinear cylinder member 10 is retracted, a clearance H is formed in the optical axis direction with respect to the distal end portion 13a of the exterior member 7 to provide the distal end portion 20c ′. Facing each other and when an external force F in the direction in which the gap H in the optical axis direction is reduced is generated, the gap H in the optical axis direction is displaced in a direction in which the tip part 20c ′ contacts the tip part 13a of the exterior member 7. Since the lens cap 18 is constituted by the outer cover member 20, it is possible to reliably relieve the external force F caused by the impact from being directly applied to the straight cylinder member 10.

  Further, since the external force F caused by the impact is absorbed by the displacement of the outer cover member 20 and the exterior member 7 contacting the outer cover member 20, the external force F caused by the impact that cannot be absorbed by the displacement in the optical axis direction is absorbed. The absorption relaxation function can be improved.

  Since the spring coil 26 is provided between the inner cover member 19 and the outer cover member 20 for elastically energizing both the cover members 19 and 20 in the direction of separating them, the light of the outer cover member 20 based on the external force F is interposed therebetween. The axial displacement can be reliably converted into elastic deformation energy, and the impact can be further reduced.

  Further, since the outer cover member 20 and the inner cover member 19 can be relatively displaced in the optical axis direction, the outer cover member 20 can be moved to the outer cover member 20 during driving of the straight tube member 10 with the lens cap 18 attached to the lens barrel. Even when the external force F is applied, it is possible to avoid applying a load directly to the inner cover member 20.

  Although the embodiment has been described above, the front ring member 13 may be formed integrally with the outer tube member 8 or the fixed tube member 9 or may be formed separately. The spring coils 26 and 29 may be made of metal or resin. Furthermore, not a spring but a leaf spring may be used.

(Other examples)
FIG. 14 is a partial enlarged view showing another example of the lens barrel according to the present invention. In this example, the adapter mounting mount member 36 is attached to the rectilinear cylinder member 10 via the pressing ring member 16. .

  In this example, a concealing ring cap member (not shown) for concealing the gap H ′ between the adapter mounting mount member 36 and the adapter (not shown) to ensure the appearance of the adapter mounting mount member 36 is shown. A hook portion 36a for locking the adapter mounting mount member 36 is formed. In this example, the engaging groove 23f of the lens cap 18 is engaged with the hook portion 36a.

  Since other configurations and operations are the same as those of the lens barrel shown in FIG. 11, the same components are denoted by the same reference numerals, and detailed description thereof is omitted.

7 ... Exterior member 10 ... Straight-traveling cylinder member (movable lens barrel)
18 ... Lens cap 19 ... Inner cover member 20 ... Outer cover member H ... Gap F ... External force

JP 2009-282392 A

Claims (15)

An inner cover member that can be attached to and detached from a movable lens barrel that is held so as to be able to advance and retract in the optical axis direction in the exterior member;
The inner cover member can be reciprocated in the optical axis direction with respect to the inner cover member, and when the movable barrel is retracted, a gap is formed in the optical axis direction with respect to the distal end portion of the exterior member to An outer cover member that faces and is displaced in a direction in which the gap in the optical axis direction is reduced when an external force is generated in a direction in which the gap in the optical axis direction is reduced, and the tip part contacts the tip part of the exterior member A lens cap.   2. The lens cap according to claim 1, wherein an elastic member is provided between the inner cover member and the outer cover member, which elastically biases the cover members in a direction in which the two cover members are separated from each other.   The lens cap according to claim 2, wherein the elastic member is a spring spring.   The said inner side cover member has a pair of engaging claw member which is urged | biased in the direction which mutually separates, and engages with this movable lens barrel at the time of mounting | wearing to the said movable lens barrel. The lens cap according to 3.   5. The lens cap according to claim 2, wherein the maximum possible size of shrinkage deformation due to an external force of the elastic member is equal to or greater than the size of the gap in the optical axis direction. An exterior member;
A movable lens barrel held in the exterior member so as to advance and retract in the optical axis direction;
An inner cover member that can be attached to and detached from the movable lens barrel, and can be reciprocated in the optical axis direction with respect to the inner cover member while covering the inner cover member, and with respect to the distal end portion of the exterior member when the movable lens barrel is stored When the external force is generated in such a way that a gap is formed in the optical axis direction and the tip portion faces and the gap in the optical axis direction is reduced, the tip of the exterior member is displaced in a direction in which the gap in the optical axis direction is reduced. And a lens cap including an outer cover member with which the tip end abuts against the lens barrel.   The elastic member that elastically urges the lens cap in a direction to separate the two cover members is interposed between the inner cover member and the outer cover member. Lens barrel.   The lens cap according to claim 7, wherein a maximum possible size of contraction deformation due to an external force of the elastic member is equal to or larger than the size of the gap.   The inner cover member has a pair of engaging claw members that are urged in directions away from each other and engage the movable lens barrel when mounted on the movable lens barrel, and the pair of engagement members on the movable lens barrel. The lens barrel according to any one of claims 6 to 8, wherein a thread groove to be engaged with the claw member is formed.   An attachment ring member having a thread groove on an inner periphery thereof for removably screwing the optical element to the movable lens barrel is provided via a pressing ring member, and the inner cover members are urged in directions away from each other, and 7. A pair of engaging claw members that engage with the movable lens barrel when mounted on the movable lens barrel, and the pair of engaging claw members are engaged with the screw grooves. The lens barrel according to claim 8. The lens barrel according to claim 10, wherein the optical element is an optical filter.   An adapter mounting mount member is provided on the movable lens barrel via a pressing ring member, and a hook portion that locks a concealing ring cap member that conceals a gap between the adapter mounting mount member and the adapter is the adapter. The inner cover member has a pair of engaging claw members that are urged away from each other and engage with the movable lens barrel when attached to the movable lens barrel, The lens barrel according to any one of claims 6 to 8, wherein a pair of engaging claws are engaged with the hook portion. The inner cover member includes a pair of concealing cover portions that are spaced apart from each other in a direction orthogonal to the optical axis in a state in which the inner cover member is attached to the movable lens barrel, and extends in the orthogonal direction. A pair of concealing cover portions that connect the pair of concealing cover portions, a pair of concealing cover portions, and a pair of concealing cover portion constituent walls that guide the pair of engaging members in opposite directions. A guide space is formed,
The outer cover member is formed with a pair of decorative cover portions that cover the pair of concealing cover portions, and a decorative connecting cover portion that connects the pair of decorative cover portions and covers the connecting bridge portion. ,
The pair of engaging claw members include a base portion guided along the constituent walls constituting the guide space, and an outer side from the base portion toward the decorative connection cover portion along the decorative connection cover portion. A knob portion that is erected in the direction and that operates the pair of engaging claw members in the opposite direction with respect to the separating direction of the pair of engaging claw members,
The pair of engaging claw members are surrounded by the outer cover member, and the distal ends of the knob portions are more optical axes than the decorative connecting cover portion with the lens cap attached to the movable barrel. The lens barrel according to claim 10 or 12, wherein the lens barrel is not projected outward in the direction.   An imaging device having the lens cap according to any one of claims 1 to 5.   An image pickup apparatus comprising the lens barrel according to claim 6.