JP2003207814A - Lens cap device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lens cap device whose breakage is prevented, even when the device is carelessly brought into contact with an obstacle while keeping a lens cap open, in the lens cap device attached to the front side of a photographic lens. <P>SOLUTION: The lens cap device 2 is mainly constituted of an adapter main body 11 attachable/detachable to/from a photographic lens frame 5, a cap member 12 freely rotatably attached to the adapter main body 11 and movable between a closed position where the photographic lens 6 is covered with the cap member and an open position where the cap member is retreated from the front side of the lens 6 and an engaging member 14 engaging with the filter screw part 5a of the lens frame 5. When the cap member 12 is excessively rotated by erroneously operating the cap member 21 in the open position, the engaging member 14 is released from engagement with the filter screw part 5a by the pressure of the edge part 12a of the cap member 12. Then, the adapter main body 11 is detached from the lens frame 5 so that the lens cap device 2 is protected. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the structure of a lens cap device that can be attached to and detached from the front surface of a taking lens.

[0002]

2. Description of the Related Art As a conventional lens cap device arranged on the front surface of a taking lens, there is a lens cap device having a rotatable barrier member at a position for covering the front surface of the taking lens and an open position. The barrier member is rotatably supported by a rotation shaft. The barrier member is
When in the open position, it is held in contact with a stopper member arranged in the vicinity of the rotating shaft.

[0003]

In the above-mentioned conventional lens barrier device, the barrier member may be inadvertently brought into contact with an external obstacle when the barrier is open. At that time, since the barrier member is in contact with the stopper member, a large stress is generated in a portion around the rotation axis of the barrier member, and there is a possibility that the barrier member may be damaged depending on the magnitude of the contact force.

The present invention has been made to solve the above-mentioned problems, and in a lens cap device that can be attached to and detached from the front surface of a taking lens, carelessly obstructs an obstacle when the cap portion is in an open state. It is an object of the present invention to provide a lens cap device that can prevent the device from being damaged even if the device is brought into contact with the device or is erroneously operated.

[0005]

According to a first aspect of the present invention, there is provided a lens cap device which is attachable to and detachable from a front surface of the taking lens so as to cover the front surface of the taking lens. Mounting means for making it attachable / detachable, a barrier section located at a position covering the front surface of the taking lens and a position retracted from the front surface of the taking lens, and when the barrier section moves from the covering position to the retracted position or more. A lens cap device attached to the filter screw by the attaching means, the attaching cap releasing means for releasing the attached state of the attaching means.
When the barrier section moves to a position more than the retracted position, the mounting state is released by the mounting release means.

A lens cap device according to a second aspect of the present invention is the lens cap device according to the first aspect, further comprising a rotating shaft for rotating the barrier portion.

A lens cap device according to a third aspect of the present invention is the lens cap device according to the second aspect, wherein the mounting means has an engaging portion that engages with a filter screw of the taking lens. The joint part is movable in the radial direction of the photographing lens, and when the barrier part rotates from the covering position to the retracted position or more, the mounting releasing means moves the mounting means to release the mounted state. .

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 1 (A), (B) and FIG.
1A and 1B are a front view and a side view of a camera equipped with a lens cap device according to a first embodiment of the present invention, and FIGS. 1A and 1B show the above lens. FIG. 2 (A) shows the lens barrel retracted state when the cap device is closed.
(B) shows a state in which the lens barrel is extended to a photographic position with the lens cap device open.

The lens cap device 2 of the present embodiment mainly comprises an adapter body 11 and a cap member 12 which is a moving member (rotating member), and the lens of the lens barrel portion 4 of the camera body 3 side of the camera 1. It is removably attached to the filter screw portion of the lens frame 5 via the adapter body 11. The lens barrel 5 holds the photographing lens 6 at the frontmost stage.

The cap member 12 is the adapter body 1.
1 is rotatably supported, and the lens frame 5 in FIG.
D0 around the rotation axis 13 along the plane orthogonal to the optical axis O of
Alternatively, it can be rotated between a closed position Pa covering the front surface of the taking lens 6 and an open position Pc retracted from the front surface of the taking lens 6 by rotating the taking lens 6 in the D0 direction. When the cap member 12 is in the open position Pc, the upper lens cap member 12 is retracted outside L1 indicating the light flux range of the photographic subject captured by the photographic lens 6 as shown in FIG. 2B.

On the left and right side surfaces of the cap member 12,
A minute protrusion 12h for opening / closing operation is arranged, and a rubber member 22 which is an elastic member for cushioning the adapter body 11 is arranged above the inner surface of the cap member 12.

Further details of the configuration of the lens cap device 2 will be described with reference to FIGS. Figure 3
[Fig. 1] is a view of the lens cap device in a closed state seen from the photographing lens side, taken along the line AA of Fig. 1 (B). FIG. 4 is a cross-sectional view taken along the line BB of FIG. 3 showing the opening operation state of the lens cap device. FIG. 5 is a view showing a state in which the lens cap device is disengaged from the lens barrel by an external force acting on the cap member, taken along the line BB in FIG. FIG. 6 is a part of a view taken along the line AA of FIG. 1B showing the vicinity of the engaging member of the lens cap device in a state where the engaging member pressing plate is removed. FIG. 7 is an exploded perspective view of a click support portion between the adapter body and the cap member. FIG. 8 is a perspective view of an engaging member of the lens cap device. Figure 9
9A and 9B are views showing the state of the click groove portion of the cap member of the lens cap device, and FIG.
9B is a sectional view taken along line CC of FIG. 3 when the cap member is in the closed position and FIG. 9B is when the cap member is in the open position. 10A, 10B, and 10C are development views showing changes in the engagement state of the click ball portion and the click groove portion of the lens cap device, and FIG.
When the cap member is in the closed position, FIG. 10B shows that when the cap member moves out of the viewfinder field.
0 (C) is a development view when the cap member is in the open position.

The lens cap device 2 according to the present embodiment has an adapter body 11 which is attachable to and detachable from the lens barrel 5 via a filter screw portion 5b, and a rotary shaft 1 with respect to the adapter body 11.
3, a cap member (cap portion, barrier portion) 12 rotatably supported, a ball click portion for positioning the cap member 12 at a closed position Pa and an open position Pc with respect to the adapter body 11, and a lens mirror. It is composed of an engaging member 14 which is a mounting means (attaching / detaching means) capable of engaging with or releasing the filter screw portion 5b of the frame 5, and two compression springs for urging the engaging member 14 in the engaging direction. Engaging spring 18
And a pressing plate 25 for pressing the engaging member 14.

As shown in FIGS. 3 and 4, the adapter body 11 is a ring-shaped member and has an optical axis O at the center.
11a corresponding to the opening of the taking lens 6 having
An engaging portion 11b which is engageable with the filter screw (female screw) 5b of the lens barrel 5 on the upper rear surface, a rotation shaft hole 11c extending in the left-right direction on the lower portion, and the rotation shaft hole 11c. A click ball hole 11d provided in the vicinity in parallel with the rotary shaft hole 11c, and a slide groove 11i along the direction (radial direction of the photographing lens) orthogonal to the optical axis O having a step portion 11h on the lower rear surface side.
And an engaging spring insertion recess 11e provided inside the slide groove 11i, a pressing plate mounting screw hole 11g, and the like.

The engaging portion 11b has an arcuate projection shape of a predetermined width that can be engaged with the filter screw 5b, and the lead of the screw is not necessary, but may have a lead.

The ball click portion comprises a click spring 16 which is a compression spring and one click ball 17. After the click spring 16 is inserted into the click ball hole 11d of the adapter body 11, the click ball 17 is inserted. The click ball 17 is biased by the click spring 16 and is held in a state of being capable of projecting to the inner wall surface 12d side of the cap member 12 which will be described later.
It can be slid on 12g (Figs. 7 and 10).

The cap member 12 is the adapter body 1.
1 is a disk-shaped member that covers the opening 11a, and includes a rotation shaft hole 12c for fitting the rotation shaft 13 provided in the lower two support portions, and the facing inner wall surfaces 12e and 12d of the support portion. Two click grooves 12f and 12g of substantially the same shape provided in the vicinity of the rotation shaft hole 12c on one inner wall surface 12d,
It has an edge portion 12a and the like which are provided on the lower side portion and which form a mounting / releasing means for the engaging member 14.

The click grooves 12f and 12g are
The arrangement angle is the rotation angle θc for opening and closing the cap member 12.
And the circumferential groove widths of the respective grooves are set so that the click ball 17 can be positioned.

The engaging member 14 is slidably inserted into the slide groove 11i of the adapter body 11 as shown in FIGS. 6 and 8 and is arcuately engageable with the filter screw 5b of the lens barrel 5. It has a protrusion 14 b, an insertion recess 14 e for the engagement spring 18, and a lower end face 14 a that is pressed by the edge 12 a of the cap member 12.

The engaging member 14 is pressed by the pressing plate 25 while being inserted into the slide groove 11i, and is supported so as to be slidable in the direction orthogonal to the optical axis O (radial direction of the photographing lens). When the lens cap device 2 is attached to the lens barrel 5, the engaging protrusion 14b is engaged with the filter screw 5b of the lens barrel 5 by the sliding movement of the engaging member 14, or the engagement thereof is performed. The state is released.

The engaging member 14 is held by being urged outward by the engaging spring 18, but in the detached state of the lens cap device, the step portion 11 of the slide groove 11i.
The h and the stepped portion 14h of the engaging member 14 are held in contact with each other. Further, the engaging protrusion 14b is provided with the filter screw 5
Any arc shape having a predetermined width that can be engaged with b is not required, and a screw lead is not necessary, but a lead may be provided. Also,
The pressing plate 25 is positioned by the positioning pin 11f, and the screw hole portion 11g of the adapter body 11 is fixed by the screw 26.
It is fixed in.

Next, the attachment / detachment to / from the lens barrel 5 and the opening / closing operation of the lens cap device 2 of the present embodiment having the above-described structure will be described. When the lens cap device 2 is attached to the lens barrel 5, the lower end face portion 1 of the engaging member 14 is attached.
4a is pressed against the engagement spring 18, and the adapter body 11
Is inserted into the filter screw portion 5b of the lens barrel 5 and the lower end portion 14a is released, the engaging portion 11b of the adapter body 11 and the engaging protrusion portion 1 of the engaging member 14 are released as shown in FIG.
4b and the filter screw portion 5b are engaged with each other, and the lens cap device 2 is in a mounted state.

When the lens cap device 2 is mounted, the cap member 12 covers the taking lens 6 in the closed position Pa.
(Fig. 1 (A), (B)), click ball 1
7 is fitted in the click groove 12f of the cap member 12 as shown in FIGS. 9 (A) and 10 (A), and the cap member 12 is held in the closed position Pa by receiving a predetermined click force. . In this state, the click ball 17 is brought into contact with the inclined surface inside the click groove 12f so that the cap member 12 is pressed in the closed position Pa direction and is held without play.

To open the lens cap device 2, the cap member 12 is rotated in the D0 direction as shown in FIG. The click ball 17 is caused by the turning operation.
Escapes from the click groove 12f. Cap member 12
Is rotated by an angle .theta.b to reach a position Pb outside the L2 range of the finder visual field, which is within the subject luminous flux range, as shown in FIG.
Approaches the inclined surface of the other click groove 12g. After that, since the urging force in the opening direction by the click ball 17 is applied, the cap member 12 surely rotates in the D0 direction.

Then, FIG. 4, FIG. 9 (B), and FIG. 10 (C)
When the cap member 12 is rotated to the opening angle θc as shown in, the click ball 17 fits into the click groove 12g. The cap member 12 reaches the open position Pc retracted from L1 indicating the light flux range of the photographic subject, receives the predetermined click force, and is held, so that the camera 1 is ready for photographing (FIG. 2 (A), ( B)).

When the cap member 12 is in the above-mentioned open position Pc, the cap member 12 is inadvertently brought into contact with an obstacle, or the cap member 12 is erroneously operated excessively and an external force in the D0 direction is further applied. If the click ball 17
Escapes from the click groove 12g, and the cap member 12
It is possible to prevent damage due to the above-mentioned external force by escaping by moving extra in the direction of D0.

Furthermore, when an external force is applied beyond the extra rotational movement of the cap member 12, as shown in FIG. 5, when the cap member 12 is turned to the vicinity of the turning position Pd, the edge portion of the cap member is moved. Engaging member 14 by 12a
The lower end surface portion 14a of the is pressed, and the engaging member 14 slides in the upward direction (direction approaching the optical axis O). The sliding movement releases the engagement between the engaging protrusion 14b and the filter screw portion 5b of the lens barrel 5. Then, the lens cap device 2 is separated from the lens barrel 5 to prevent damage due to the external force.

When the cap member 12 is largely rotated as described above, the rotation shaft support portion of the cap member 12 contacts the contact surface 11j around the rotation shaft of the adapter body 11 to cause the cap member 12 to rotate. Does not rotate relative to the adapter body 11 by a predetermined angle or more, and the periphery of the rotation shaft support portion is protected.

After the lens cap device 2 is opened and closed as described above, the cap member 12 is placed in the opposite direction.
By rotating in the 0 direction, as shown in FIG.
The lens cap device 2 can be closed by returning to the closed position Pa of (B).

According to the above-described lens cap device 2 of the present embodiment, the lens cap device 2 can be easily attached to and detached from the lens barrel 5, and it is not necessary to detach the lens cap device 2 at the time of photographing, and the cap member can be rotated. The shooting lens can be opened by simply doing. Further, since it is not necessary to remove the lens cap device 2 at the time of photographing, there is no fear of loss or the like, and the user can concentrate on photographing.

When the lens cap device 2 is in the open state, the cap member 12 in the open position Pa is excessively rotated in the opening direction even if the cap member 12 is accidentally brought into contact with an obstacle or is erroneously operated. This prevents damage to the lens cap device 2. Further, when the cap member 12 is further rotated, the engagement member 14 is slid by the cap member 12, and the engagement between the adapter body 11 and the filter screw portion 5b of the lens barrel 5 is released.
The disengagement of the engaged state prevents the lens cap device 2 from being damaged.

Next, a lens cap device according to a second embodiment of the present invention will be described with reference to FIGS.
FIG. 11 is a view of the lens cap device in the closed state viewed from the photographing lens side. FIG. 12 is a sectional view taken along the line EE of FIG. 11 showing the opening operation state of the lens cap device.
FIG. 13 is an exploded perspective view of the adapter body of the lens cap device and the click support portion of the cap member. Figure 1
4A and 4B are views showing the state of the click groove portion when the cap member of the lens cap device is in the closed position, and FIG. 14A is a sectional view taken along the line FF of FIG. FIG. 14B is a sectional view taken along line GG of FIG. 11. Figure 15
(A), (B) is a figure which shows the state of the click groove part when the cap member of the said lens cap device is in an open position, FIG. 15 (A) is a cap part in the FF cross section of FIG. 15 is a cross-sectional view when the is in the open position, and FIG.
FIG. 3 is a cross-sectional view of the cap section of FIG. 16 (A), (B), and (C) are development views showing changes in the engagement state of the click ball portion and the click groove portion of the lens cap device.
FIG. 16A shows the state when the cap member is in the closed position as shown in FIG.
FIG. 16B shows the state of FIG. 16 when the cap member is still within the finder visual field range (the above-mentioned photographing subject luminous flux range).
(C) is a development view when the cap member is in the open position.

Lens cap device 2A of this embodiment
Is the lens cap device 2 of the above-described first embodiment.
However, only the structure around the click portion is different, and other configurations are the same. Hereinafter, different parts will be described, but the same components will be described with the same reference numerals as those of the components of the first embodiment.

In the case of the lens cap device 2 of the first embodiment, the cap member 12 is positioned Pb 'within the finder field light flux range (within the photographing object light flux range) L2 while the cap member 12 is being opened. (FIG. 12), if the user stops the rotation operation,
The click biasing force in the opening direction by the click ball does not act, and the cap member 12 stops at that position. If shooting is performed in this state, the subject light is kicked, resulting in unstable exposure, resulting in an unsatisfactory shooting result.
Therefore, it is necessary to push the cap member 12 again to rotate it to the open position Pc, which is troublesome.
The lens cap device 2A of the present embodiment is configured to solve the above problems.

The lens cap device 2A of this embodiment is
Adapter body 11A, cap member (barrier part) 12A that is a moving member (rotating member), and cap member 12A
And the engaging member 14 which is a mounting means (attaching / detaching means) similar to that of the first embodiment, and urges the engaging member 14 in the engaging direction. It has two engaging springs 18 and a pressing plate 25 for pressing the engaging member 14.

As shown in FIG. 13, the ball click portion comprises a click spring 38, which is a compression spring, and a pair of click balls 36 and 37.
It is inserted into a through click ball hole 11k provided in parallel with the rotary shaft hole 11c of 1A.

The click balls 36 and 37 are inserted into the outside of the click spring 38 and can be protruded to the inner wall surface 12i side and the inner wall surface 12j side of the cap member 12A, which will be described later, while being biased outward. Is kept in a good condition.

On the other hand, in the cap member 12A, the inner wall surface 1 of one of the two supporting portions provided with the turning shaft hole 12c.
The click groove 12k and the first
The click groove 12m which is a click groove of is arranged.
Further, a click groove 12n and a click groove 12p which is a second click groove are arranged near the rotation shaft hole 12c on the other inner wall surface 12j of the support portion.

A click ball 36 can be slidably contacted with the click grooves 12k and 12m.
A click ball 37 can be slidably contacted with n and 12p.

Further, FIGS. 14 (A), (B), 15
As shown in (A) and (B), the click grooves 12k and 1
2 m has an arrangement angle substantially equal to the opening / closing rotation angle θc of the cap member 12 with respect to the center of the rotation shaft 13, and each circumferential groove width is a groove width with which the click ball 36 can be positioned.

The click groove 12n is provided at a position facing the click groove 12k, and its circumferential groove width is
The groove width is the same as that of the click groove 12k so that the click ball 37 can be positioned. On the other hand, the click groove 12
p has an inclined surface 12p0 at a circumferential position that is close to the click groove 12n side with respect to the rotation angle θc of the cap member 12 to the open position, and the circumferential groove width positions the click ball 37. The groove width is wider than the groove width.

Therefore, when the cap member 12A is rotated relative to the adapter body 11A in the D0 direction from the closed position Pa, the click ball 36 is in the middle between the click grooves 12k and 12m as shown in FIG. 16B. When in the position, the click ball 37 approaches the inclined surface 12p0 of the click groove 12p.

Next, the attachment / detachment to / from the lens barrel 5 and the opening / closing operation of the lens cap device 2A of the present embodiment having the above-described structure will be described. Even when the lens cap device 2A is mounted on the lens barrel 5, the lower end surface portion 14a of the engaging member 14 is pressed to attach the adapter body 11A to the lens mirror frame 5 as in the case of the lens cap device 2 of the first embodiment. Inserted into the filter screw portion 5b of the frame 5, the lower end portion 1
When 4a is released, the lens cap device 2A is in the mounted state.

In the mounted state of the lens cap device 2A, when the cap member 12A is in the closed position Pa for covering the taking lens 6 (FIG. 12), the click balls 36 and 3 are clicked.
7 is fitted in the click grooves 12k and 12n of the cap member 12A as shown in FIGS. 14 (A), (B) and 16 (A), and the cap member 12A receives the predetermined click force and It is held at the closed position Pa. In this state, the click balls 36 and 37 respectively
Since the cap member 12A is in contact with each of the pair of inclined surfaces on the inner side of 2k and 12n, the cap member 12A is held in the closed position Pa without backlash.

To open the lens cap device 2A, the cap member 12A is rotated in the direction D0 as shown in FIG. The turning operation causes the click balls 36 and 37 to escape from the click grooves 12k and 12n. The cap member 12 is rotated by the angle θb ′, and L2 indicating the finder visual field luminous flux range within the above-mentioned photographing subject luminous flux range.
16B, when the position Pb ′ near the inner boundary is reached.
As shown in FIG. 5, one click ball 36 is still on the inner wall surface 12i, while the other click ball 37 approaches the inclined surface 12p0 of the click groove 12p as described above. Therefore, thereafter, the click ball 37 generates a turning force for urging the cap member 12A in the D0 direction, and the cap member 12 automatically rotates in the D0 direction.

When the click ball 36 side comes into sliding contact with the inclined surface of the click groove 12m, the cap member 12A
Receives rotational force in the D0 direction via the click ball 36 and rotates by an angle .theta.c so that the click ball 36 fits into the click groove 12m (FIG. 16C). It should be noted that the click ball 37 does not apply a turning force around the rotation shaft 13 to the cap member in the click groove 12p.

Then, the cap member 12A is held by the predetermined click force at the open position Pc retracted from L1 showing the light flux range of the photographic subject (FIG. 12, FIG. 15 (A),
(B)).

When the cap member 12A is in the above-mentioned open position Pc, when the cap member 12A is inadvertently brought into contact with an obstacle or is erroneously operated and an external force in the D0 direction acts, the As in the case of the lens cap device 2 of the first embodiment, the cap member 12A is pivotally moved and escapes excessively to prevent damage due to the external force.

Further, even when an external force larger than the above-mentioned extra rotation acts on the cap member 12A due to an obstacle, the edge portion of the cap member 12A is the same as in the case of the lens cap device 2 of the first embodiment. The lower end surface portion 14a of the engaging member 14 is pressed by 12a, and the engaging protrusion 14b
Is disengaged from the filter thread portion 5b of the lens barrel 5. By releasing the engagement, the lens cap device 2A
Is separated from the lens barrel 5 and is prevented from being damaged by the external force.

After opening the lens cap device 2A,
Even in the closed state, as in the case of the lens cap device 2 of the first embodiment, the cap member 12 can be returned to the closed position Pa by rotating the cap member 12 in the direction opposite to the D0 direction.

According to the lens cap device 2A of the present embodiment described above, like the lens cap device 2 of the first embodiment, it can be easily attached to and detached from the lens barrel 5, and the lens cap can be used at the time of photographing. There is no need to remove the device 2A.

In particular, when the cap member 12A is opened, if the cap member 12A is still within the finder field of view, even if the opening operation is inadvertently stopped, the urging force of the one click ball 37 in the opening direction acts. Therefore, the cap member 12A does not stay within the finder visual field range (within the photographing subject light flux range), and the cap member 12A is rotated to the open position without performing the above-mentioned inconvenient photographing. , Easy to use.

Further, when the lens cap device 2A is in the open state, the case where the cap member 12A in the open position Pa is inadvertently brought into contact with an obstacle is also the case of the lens cap device 2 of the first embodiment. Similar to cap member 1
2A is pivotally moved in the extra opening direction, or the lens cap device 2 is released by disengagement from the filter screw portion 5b of the lens barrel 5 by sliding movement of the engaging member 14.
Damage to A is prevented.

Based on the above-described embodiment of the present invention, (1) In a lens cap device which is attached to and detached from the front surface of the taking lens so as to cover the front surface of the taking lens, in order to be attachable to and detachable from the filter screw of the taking lens. Mounting means, a barrier portion located at a position covering the front surface of the taking lens and a position retracted from the front surface of the taking lens, and when the barrier portion moves from the covering position to the retracted position or more, It is possible to propose a lens cap device, characterized in that the lens cap device has a mounting releasing means for releasing the mounted state, and the mounting means has an engaging portion that engages with a filter screw of the taking lens.

(2) Further, it is possible to propose the lens cap device according to the above (1), which has a rotating shaft for rotating the barrier portion.

[0056]

As described above, according to the present invention, in the lens cap device which can be attached to and detached from the front surface of the taking lens, when the cap portion is in the open state, the lens cap device is inadvertently brought into contact with an obstacle or is erroneous. It is possible to provide a lens cap device capable of preventing the device from being damaged even if the cap is moved due to the movement of the cap portion to release the engagement with the lens barrel.

[Brief description of drawings]

FIG. 1 is a view showing a camera in which a lens cap device according to a first embodiment of the present invention is mounted, in a lens cap closed state and in a lens barrel retracted state;
(A) and (B) are a front view and a side view, respectively.

2 is a diagram showing a state in which a lens cap of a camera equipped with the lens cap device of FIG. 1 is opened and a lens barrel is extended to a photographing position;
(A) and (B) are a front view and a side view, respectively.

3 is a view of the lens cap device of FIG. 1 in a closed state as viewed from the side of the taking lens, taken along the line AA of FIG. 1 (B).

4 is a sectional view taken along line BB of FIG. 3 showing an opening operation state of the lens cap device of FIG.

5 is a state in which the cap member of the lens cap device of FIG. 1 is removed from the lens barrel by an external force acting on the cap member;
It is the figure shown by the -B cross section.

FIG. 6 is a part of a view taken along the line AA of FIG. 2B showing the surroundings of the engagement member with the engagement member pressing plate of the lens cap device of FIG. 1 removed.

7 is an exploded perspective view of a click support portion between the adapter body and the cap member of the lens cap device of FIG.

8 is a perspective view of an engagement member of the lens cap device of FIG.

9 is a view showing a state of a click groove portion of the cap member of the lens cap device of FIG. 1, wherein FIG. 9 (A) shows the cap member in the closed position and FIG. 9 (B) shows the cap member in the open position. FIG. 4 is a sectional view taken along the line CC of FIG. 3 when it is in the position.

FIG. 10 is a development view showing changes in the engagement state of the click ball portion and the click groove portion of the lens cap device of FIG. 1, and FIG. 10 (A) shows the state when the cap member is in the closed position. FIG. 10B is a development view when the cap member is moved out of the viewfinder field, and FIG. 10C is a development view when the cap member is in the open position.

FIG. 11 is a view of the lens cap device according to the second embodiment of the present invention in a closed state as seen from the photographing lens side.

12 is a sectional view taken along line EE showing the opening operation state of the lens cap device of FIG.

13 is an exploded perspective view of an adapter body of the lens cap device of FIG. 11 and a click support portion of a cap member.

14 is a diagram showing a state of the click groove portion when the cap member of the lens cap device of FIG. 11 is in the closed position, and FIG. 14 (A) is a sectional view taken along line FF of FIG.
4B is a sectional view taken along line GG of FIG. 11.

15 is a view showing a state of the click groove portion when the cap member of the lens cap device of FIG. 11 is in the open position, and FIG. 15 (A) is a sectional view taken along line F-F of FIG.
5B is a sectional view taken along line GG of FIG.

16 is a development view showing a change in the engagement state of the click ball portion and the click groove portion of the lens cap device of FIG. 11, and FIG. 16 (A) shows the state when the cap member is in the closed position. 16B is a development view when the cap member is still within the finder visual field range, and FIG. 16C is a development view when the cap member is in the open position.

[Explanation of symbols]

6 ... Shooting lens 2, 2A ... Lens cap device 5b ... Filter screw 12, 12A ... Barrier member (barrier part) 12a ... Edge part of cap member (mounting release means) 13 ... Rotation axis 14 ... Engaging member (mounting means) 14b ... Engaging protrusion (engaging portion) Pa: Position to cover the taking lens Pc ... Position retracted from the front of the taking lens

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Naohiro Tsuchida             2-43 Hatagaya, Shibuya-ku, Tokyo Ori             Inside Npus Optical Industry Co., Ltd. F-term (reference) 2H083 BB14 BB16

Claims (3)

[Claims] 1. A lens cap device attachable to and detachable from the front surface of the taking lens to cover the front surface of the taking lens, and mounting means for attaching to and detaching from a filter screw of the taking lens, and a position for covering the front surface of the taking lens. And a barrier portion located at a position retracted from the front surface of the photographing lens, and mounting release means for releasing the mounted state of the mounting means when the barrier portion moves from the covering position to the retracted position or more. A lens cap device characterized in that 2. The lens cap device according to claim 1, further comprising a rotation shaft for rotating the barrier portion. 3. The mounting means has an engaging portion that engages with a filter screw of the photographing lens, the engaging portion being movable in a radial direction of the photographing lens, and the position covered by the barrier portion. 3. The lens cap device according to claim 2, wherein the mounting means is moved by the mounting releasing means to release the mounted state when the lens cap device is rotated to a position more than the retracted position.