JP7118418B2 - Lens hood - Google Patents

Description

The present invention relates to a lens hood attached to a lens barrel.

2. Description of the Related Art Conventionally, many lens hoods that are attached to interchangeable lenses are known to have a locking mechanism. By providing such a mechanism, effects such as prevention of unexpected dropout and suppression of rattling of the mounting member are exhibited.

A lens hood locking mechanism is disclosed, for example, in Patent Document 1. Patent Document 1 discloses a lock mechanism using a lock lever and a torsion spring.

JP 2016-109944 A

However, in the invention described in Patent Document 1, the lock lever has a seesaw structure having a locking pawl and an operating portion at both ends, and the operating portion sinks while rotating around a fulcrum during operation. Therefore, the operation part sinks while tilting with respect to the hood, and the direction in which the operation part is pushed is not the same as the direction in which the operation part sinks, giving the user a sense of discomfort.

In addition, since the operation part rotates around the fulcrum, the gap between the operation part and the hood is not uniform over the entire operation part when the operation part is pushed. Therefore, the internal structure is visible through the gap between the operating portion far from the fulcrum and the hood, resulting in a poor quality structure.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a lens hood having a lock mechanism that provides an excellent feel when locked and a high-quality appearance in use.

The invention according to claim 1 is a lens hood that is attachable to and detachable from a lens barrel, and includes an operating member having a plurality of guides, and a fixed side member having a plurality of guide portions with which the guides are slidably engaged. and a regulating member that interlocks with the operating member, a coil spring that biases the regulating member, and a lock spring that biases the operating member, and the lock spring is held by the fixed side member and all When the operating member is pushed in, the restricting member moves, and the restricting member abuts against the lens barrel due to the biasing force of the coil spring, thereby restricting rotation about the optical axis. It is a lens hood characterized by performing

According to a second aspect of the invention, the operating member has an elongated hole portion, the restricting member has an axial portion, and the axial portion is inserted into the elongated hole portion. It is a lens hood described in.

The invention according to claim 3 is the lens hood according to claim 1 or 2 , wherein the lock spring always biases the operating member in a direction substantially opposite to that of the coil spring.

According to the present invention, it is possible to provide a lens hood having a lock mechanism that is excellent in usability when locked and has a high-quality appearance in use.

1 is a perspective view showing an interchangeable lens in one example of the present invention; FIG. It is a perspective view showing a lens hood in one example of the present invention. 1 is an exploded perspective view showing a lens hood according to one embodiment of the present invention; FIG. 1 is a perspective view showing a locking mechanism in one embodiment of the invention; FIG. FIG. 4 is a perspective view showing a lock button in one embodiment of the present invention; FIG. 4 is a cross-sectional view showing switching of a locked state in one embodiment of the present invention; FIG. 4 is a cross-sectional view showing a lock button spring according to one embodiment of the present invention;

BEST MODE FOR CARRYING OUT THE INVENTION The best mode for carrying out the present invention will be described below with reference to the accompanying drawings. It should be noted that the present invention is not limited by this embodiment.

FIG. 1 is a perspective view showing an interchangeable lens 1 in one embodiment of the invention. Also, FIG. 2 is a perspective view showing the lens hood 2 in one embodiment of the present invention. Also, FIG. 3 is an exploded perspective view showing the lens hood 2 in one embodiment of the present invention. Also, FIG. 4 is a perspective view showing a locking mechanism in one embodiment of the present invention. The members of the lens hood 2 will be described below with reference to FIGS. 1, 2, 3 and 4. FIG.

The lens barrel 10 can be exchanged and attached to the imaging device, and has an optical element having an optical axis at the center. In addition, two bayonet portions 11 for attaching the lens hood 2 are provided at the tip portion.

The lens hood 2 can be attached to the lens barrel 10 and comprises a hood base 20 , a hood cover 30 , a lock lever 40 , a coil spring 50 , a lock button 60 , a lock button spring 70 and fastening screws 80 .

The hood base 20 is a cylindrical member for blocking unnecessary rays from entering the lens barrel 10 . The hood base 20 has a groove, and the lens hood 2 is attached to the lens barrel 10 by engaging the groove with the bayonet portion 11 of the lens barrel 10 . The groove portion includes a first groove portion 21 that engages with the bayonet portion 11 when mounting in the forward direction, and a second groove portion 22 that engages with the bayonet portion 11 when mounting in the reverse direction. The hood base 20 is formed with two guide portions 23 that are engaged with the guides 61 of the lock button 60 in the direction of the optical axis. Equipped with holes.

A hood cover 30 is a member in which a lens lock mechanism is incorporated. It fits with the hood base 20 and is fixed by five fastening screws 80 in a direction parallel to the optical axis. A lock lever 40 , a coil spring 50 , a lock button 60 and a lock button spring 70 are incorporated inside the hood cover 30 . Further, the hood cover 30 has a second shaft hole 31 into which the second shaft portion 42 of the lock lever 40 is fitted, and a through hole 32 is formed in the outer peripheral portion. It also has two holding portions 33 for hooking and holding the lock button spring 60 .

The lock lever 40 includes a first shaft portion 41 fitted in a first shaft hole formed in the hood base 20 , a second shaft portion 42 fitted in a second shaft hole 31 formed in the hood cover 30 , and a lock button 60 . It has a third shaft portion 43 inserted into the matching hole 62 and is sandwiched between the hood base 20 and the hood cover 30 . The lock lever 40 has a forward lock claw 44 and a reverse lock claw 54 , and the lock claws are exposed outside from the hood base 20 and the hood cover 30 . Also, the lock lever 40 contacts the lock button 60 at the contact portion 46 .

The coil spring 50 is fitted to the first shaft portion 41 of the lock lever 40 and attached so as to bias the lock lever 40 . The forward lock claw 44 or the reverse lock claw 45 of the lock lever 40 abuts against the bayonet portion 11 formed on the lens barrel 10 by the biasing force of the coil spring 50, thereby restricting the rotation of the lens hood 2 around the optical axis. and suppress rattling in the rotational direction. When the lens hood 2 is attached to the lens barrel 10 in the forward direction, the forward lock claws 44 abut against it, and when the lens hood 2 is attached in the reverse direction, the reverse lock claws 45 abut against it.

FIG. 5 is a perspective view showing lock button 60 in one embodiment of the present invention. A lock button 60 is a member for releasing the locked state of the lens hood 2 . The lock button 60 has two guides 61 each slidably engaged with the guide portion 23 of the hood base 20 . Further, the lock button 60 is formed with an elongated engaging hole 62 into which the third shaft portion 43 of the lock lever 40 is inserted. In addition, although the guide 61 has a cylindrical shape in this embodiment, it is not limited to this. Other shapes may be used as long as they slide along the guide portion 23 .

The lock button spring 70 is a spring member for biasing the lock button 60 in the pushing direction. The lock button spring 70 is held by the two holding portions 33 of the hood cover 30 and contacts the two guides 61 of the lock button 60 .

The above is the description of the members of the lens hood 2 in this embodiment. Next, the hood lock mechanism in this embodiment will be described. The lens hood 2 is attached by engaging the bayonet portion 11 of the lens barrel 10 through the opening 25 of the groove provided in the hood base 20 and sliding and rotating the bayonet portion 11 . When one end of the bayonet portion 11 comes into contact with the abutting portion 26 of the groove as a result of the sliding rotation, the opposite end is locked by the lock claw, and the lens hood 2 and the lens barrel 10 are fixed.

FIG. 6 is a sectional view showing switching of the locked state in one embodiment of the present invention. (a) shows the locked state of the hood lock mechanism, and (b) shows the unlocked state of the hood lock mechanism. As shown in FIG. 6, when the lock button 60 is pushed in, the lock lever 40 in contact with the lock button 60 is interlocked to rotate around the first shaft portion 41 and the second shaft portion 42, thereby rotating the bayonet portion of the lock claw. 11 is released. The position when the lock button 60 is not pushed in is called the reference position of the lock button 60 .

Here, as described above, the conventional hood lock mechanism has a problem with the usability of the operating portion. In the present invention, the lock button 60 is separated from the lock lever 40 and further provided with the guide 61 , so that the lock button 60 sinks evenly into the hood cover 30 .

By forming the lock button 60 separately from the lock lever 40 , the movement of the lock button 60 is independent of the rotational movement of the lock lever 40 . Therefore, as shown in FIG. 6, the lock button 60 can move in a direction different from that of the lock lever 40 when pushed. Further, by forming the engaging hole 62 into an elongated hole shape, the positional relationship between the lock button 60 and the lock lever 40 can be changed within a range restricted by the elongated hole shape.

Further, the movement direction of the guide 61 of the lock button 60 is restricted in the direction of the optical axis by two guide portions 23 formed on the hood base 20 . Here, since the guide portion 23 and the two guides 61 are provided, the movement of one guide 61 is restricted by the other guide 61 . Therefore, the lock button 60 does not tilt with respect to the hood cover 30, but sinks along the guide portion 23 in the optical axis direction.

As described above, the lens hood 2 of the present invention realizes uniform pressing of the lock button 60, and thus has an excellent operational feeling. In addition, it is possible to prevent the internal structure from being exposed due to tilting of the lock button 60, and the structure has a high-quality appearance in use.

Although two guides 61 and two guide portions 23 are arranged in this embodiment, the present invention is not limited to this. A plurality of guides 61 and a plurality of guide portions 23 may be provided so as to restrict movement of each other.

Next, the lock button 60 for attaching the lens hood 2 to the lens barrel 10 according to the present invention will be described. The lens hood 2 is attached by engaging the bayonet portion 11 of the lens barrel 10 through the opening 25 of the groove provided in the hood base 20 and sliding and rotating the bayonet portion 11 . Here, as shown in FIG. 2, a lock claw is provided near the opening 25 of the groove, and contacts the bayonet portion 11 during sliding rotation. Therefore, while the lens hood 2 is being attached and detached, the bayonet portion 11 always urges the locking claws.

When the lock claw is urged, the lock lever 40 rotates about the first shaft portion 41 and the second shaft portion 42, and the hood lock mechanism enters the unlocked state shown in FIG. 6(b). Further, since the lock button 60 and the lock lever 40 are engaged with each other by the third shaft portion 43 and the engagement hole 62, the lock button 60 moves as the lock lever 40 rotates, and is pushed in from the reference position. Become. At this time, since the coil spring 50 does not apply force to the lock button 60, the lock button 60 can move within the range restricted by the engagement hole 62 while the lens hood 2 is being attached, and rattling occurs. put away.

Therefore, in the present invention, by providing the lock button spring 70, the rattling of the lock button 60 during attachment and detachment of the lens hood 2 is suppressed. FIG. 7 is a cross-sectional view showing a lock button spring 60 according to one embodiment of the invention. (a) shows the positional relationship in the locked state, and (b) shows the positional relationship in the detachable state. In addition, the white arrow shown in the drawing indicates the direction in which the lock button spring 70 biases the lock button 60 , and the black arrow indicates the direction in which the coil spring 50 biases the lock button 60 .

The lock button spring 70 contacts the guide 61 of the lock button 60 and biases the lock button 60 in the pushing direction. In addition, the coil spring 50 urges the lock button 60 through the lock lever 40 in a substantially opposite direction to the lock button spring 70 . Here, the biasing force of the coil spring 50 is set larger than the biasing force of the lock button spring 70 . Therefore, in the locked state, the lock button spring 70 is urged by the lock button spring 70 to fix the lock button 60 at the reference position.

On the other hand, in the detachable state, the coil spring 50 does not generate an urging force on the lock button 60 , and the force acting on the lock button 60 is only the urging force of the lock button spring 70 . Therefore, the lock button 60 is uniformly urged by the lock button spring 70, and the lock button 60 does not rattle even when the lens hood 2 is being attached or detached. The lock button spring 70 is arranged in the hood cover 30 so as to contact the guide 61 of the pushed-in lock button 60 in a non-deformed state.

As described above, according to the present invention, by constantly urging the lock button 60, which is provided separately, by the lock button spring 70, it is possible to suppress rattling of the lock button 60 not only when the lens hood is locked, but also when the lens hood is attached and detached. and

Note that the lens barrel according to the present invention is appropriately deformed and scaled according to the imaging device to which the present invention is applied. Also, if necessary, various modifications and alterations such as changes in appearance due to changes in the outer dimensions of the device, connection positions between members, etc. are possible, but all are within the equivalent scope of the present invention.

1 interchangeable lens 2 lens hood 10 lens barrel 11 bayonet portion 20 hood base 21 first groove portion 22 second groove portion 23 guide portion 25 opening portion 26 contact portion 30 hood cover 31 second shaft hole 32 through hole 33 holding portion 40 lock Lever 41 First shaft portion 42 Second shaft portion 43 Third shaft portion 44 Forward lock claw 45 Reverse lock claw 46 Contact portion 50 Coil spring 60 Lock button 61 Guide 62 Engagement hole 70 Lock button spring 80 Fastening screw

Claims (3)

A lens hood that is attached to and detached from a lens barrel,
an operating member having a plurality of guides;
a stationary member having a plurality of guide portions with which the guides are slidably engaged;
a regulating member interlocking with the operating member;
a coil spring that biases the regulating member;
a lock spring that biases the operating member;
has
The lock spring is held by the fixed-side member and arranged to abut on all of the guides,
A lens hood according to claim 1, wherein the restricting member moves when the operating member is pushed in, and the restricting member abuts against the lens barrel due to the biasing force of the coil spring, thereby restricting rotation about the optical axis. 2. The lens hood according to claim 1, wherein said operating member has an elongated hole, said restricting member has an axial portion, and said axial portion is inserted into said elongated hole. 3. The lens hood according to claim 1, wherein said lock spring always urges said operating member in a direction substantially opposite to said coil spring.

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