JP2001324660A - Focus ring attaching structure for optical equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a problem that optical equipment can not be miniaturized while maintaining specified attaching strength because it is constituted by attaching a focus ring attaching member to the equipment side by using a machine screw in focus ring attaching structure, and also a problem that a lens is stained by the infiltration of grease because a grease coating part and the lens are positioned near. SOLUTION: As for the focus ring attaching structure for optical equipment; the optical equipment having the lens to which the focus ring is attached through the attaching member is immune to external shock caused by vibration and dropping or the like and obtains coupling strength by which backlash is prevented by constitution that the attaching member and the optical equipment side are coupled by bayonet-coupling of plural key locking parts and projecting parts. Since the thickness of a member at a bayonet-coupling part need not be secured to be large, the entire structure is miniaturized (small-diameter) and a creeping distance leading to the lens from the grease coating part of the attaching member gets long, whereby the grease is hardly leaked and the staining of the lens by the grease is eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for mounting a focus ring (commonly referred to as a manual focus ring) for manually adjusting a focus in an optical apparatus having a lens, such as a camcorder, a still camera, and a digital camera. Things.

[0002]

2. Description of the Related Art As this kind of focus ring mounting structure, for example, a structure shown in FIGS. In this known focus ring mounting structure, for example, a focus ring 2 is mounted on a lens barrel cover 1 of a front panel in a camcorder.
Near the tip of the lens barrel cover 1, as shown in FIG.
An inwardly protruding flange portion 3 is provided, and the flange portion 3 is provided with a plurality (three) of screw insertion holes 4. A groove 5 into which a part of a focus gear described later is fitted is formed on the distal end surface of the lens barrel cover 1.

[0003] On the back side of the focus ring 2, a focus gear 6 is incorporated in a non-rotational state, and from the front side, a mounting member 7 called a filter screw is attached to the focus ring 2.
It is configured to be inserted in a rotatable state with respect to. A screw engaging groove 8 is provided in the mounting member 7 at a position corresponding to the screw insertion hole 4 provided in the flange portion 3 of the lens barrel cover 1, and together with the focus ring 2 and the focus gear 6, the lens barrel is provided. Fit into the tip of the cover 1,
The mounting member 7 is brought into contact with the flange portion 3, and the screw 9 is screwed into the screw engaging groove 8 from the screw insertion hole 4 side (back side) to fix the mounting member 7 to the lens barrel cover 1. Accordingly, the focus ring 2 and the focus gear 6 are rotatably attached to the lens barrel cover 1.

In this case, the rotatably provided focus ring 2 and focus gear 6 apply grease to a contact portion with the mounting member 7 to generate a rotating torque. Is a so-called grease application section for rotational torque. The lens barrel cover 1
It covers the lens group 10 attached to the device body.

[0005]

However, in the focus ring mounting structure according to the prior art, since the mounting member is fixed by screws, the mounting member has a corresponding strength for obtaining a predetermined strength against the screws. The thickness of the screw head is necessary, and at the same time, since the screw head has a screw head, it is necessary to have a width corresponding to the size of the screw head at the screw fixing part, thereby reducing the size There is a problem that it cannot be done. If the screws are reduced in size, the size can be reduced to some extent, but the fixing strength of the mounting member is reduced accordingly. For example, accessories such as a conversion lens are attached to the tip of the lens barrel cover (mounting member) like a camcorder. When installing, the strength becomes insufficient,
There is a problem that it cannot be used.

In the conventional focus ring mounting structure, since the mounting member is fixed by screws,
Since it is vulnerable to external shocks due to vibration, drop, etc., and it is screwed at a position close to the grease application part,
The grease wraps around to the screw stop position, the screw stop is easily loosened, the fixing of the mounting member is loosened, and not only does the focus ring rattle, but also grease adheres to the lens group in part and stains the lens Has problems.

Therefore, in the conventional focus ring mounting structure, it is necessary to solve the problem of maintaining a predetermined strength and enabling downsizing, and suppressing the sneak of grease to eliminate dirt on the lens. Have issues that must be addressed.

[0008]

As a specific means for solving the problems of the prior art, the present invention relates to an optical apparatus having a lens to which a focus ring is mounted via a mounting member, wherein The device side provides a mounting structure of a focus ring in an optical device, wherein the plurality of key-shaped locking portions and the projections are connected by bayonet coupling.

Further, in the focus ring mounting structure of the present invention, a stopper member is provided at a position where the bayonet connection is not released; a focus gear is incorporated in the focus ring in a non-rotational state. That the body of the mounting member is provided with a grease accumulation groove in the circumferential direction; and that the stopper member has an arc shape, and has a plurality of tongue-shaped portions, locking claws, and screws. And a boss portion as an additional requirement.

[0010] In the focus ring mounting structure according to the present invention, since the mounting member of the focus ring and the optical device side are connected by bayonet bonding, the thickness of the material at the connecting portion is increased unlike the connection by screws or the like. Since there is no need to remove the connector, the overall size can be reduced, and the connection strength can be greatly improved so as to be resistant to external impacts such as vibration and dropping and to prevent rattling.

Further, in the focus ring mounting structure according to the present invention, the creepage distance from the contact portion between the mounting member and the focus ring, that is, the grease application portion for rotational torque to the lens side is increased, and the lens is made of grease. It prevents dirt.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. First, in FIG. 1, for example, a lens barrel cover 21 is integrally formed on a front panel 20 of a camcorder, and the lens barrel cover 21 corresponds to a so-called optical device side. 22 is to be attached.
When the focus ring 22 is attached, the focus gear 23 is incorporated and attached by a mounting member 24 called a filter screw and a stopper member 25 for fixing the mounting member.

The lens barrel cover 21 is, as shown in FIG.
A plurality (six) of convex portions 26 projecting along the inner peripheral surface are provided integrally at substantially equal intervals on the inner side near the distal end portion, and the end surface of the lens barrel cover 21 is provided with a focus gear 23. A groove 27 into which a part is fitted is formed.

As shown in FIG. 3, the focus ring 22 has a flange 28 protruding substantially at the center of the inner peripheral surface thereof, and a plurality of (three) small holes 29 provided in the flange 28. I have. The focus gear 23 has a gear portion 3 on the rear side.
0 is formed, and a pin-shaped small projection 31 that fits into the small hole 29 near the front surface side and is incorporated in a non-rotational state with respect to the focus ring 22 is formed.

The mounting member 24, called a filter screw,
A flange portion 32 is integrally formed on the front side, and a plurality (six) of key-shaped locking portions 33 respectively bayonet-coupled to the convex portion 26 of the lens barrel cover 21 at a predetermined interval D on the rear side. It is formed integrally. The predetermined interval D is an interval equal to or longer than the length of at least one convex portion 26. In addition, the trunk of the mounting member 24, that is,
Between the flange portion 32 and the key-shaped locking portion 33, for example, two grease collecting grooves 24a (see FIG. 1) are provided along the circumferential direction.

The stopper member 25 for restricting the rotation of the mounting member 24 and fixing it has an arcuate shape as a whole, and a plurality of (three) tongue-like portions 34 are integrally formed on the front side thereof so as to protrude. A locking claw 35 and a screw boss 36 are formed on the rear side. In this case, the width of the tongue portion 34 substantially corresponds to the interval D between the key-shaped locking portions 33, and if provided at at least two places, stability in mounting is obtained, and The rotation of the member 24 can be regulated. In addition, on the inner wall surface of the lens barrel cover 21,
A recess 37 into which the locking claw 35 is fitted and locked.
(See FIG. 1).

The stopper member 25 is provided with a plurality of pin holes 38 in order to determine whether the stopper member 25 is at a proper position for mounting and to stabilize the mounting state. The projection 39 is provided inside the lens barrel cover 21 (see FIG. 4).

Each of the members thus formed, that is,
When attaching the focus ring 22, the focus gear 23, the attachment member 24, and the stopper member 25 to the lens barrel cover 21, first, the focus gear 23 is incorporated into the focus ring 22. At the time of this installation, the focus gear 23 is attached from the back side of the focus ring 22, and the pin-shaped small projection 31 is inserted into the small hole 29 of the flange portion 28.
Are inserted into a non-rotational state between them, and the assembled state is maintained, and the gear portion 30 of the focus gear 23 is attached to the lens barrel cover 21 from the front side of the lens barrel cover 21.
And set it so that it fits into the groove 27 of FIG.

Next, the mounting member 24 is inserted from the front side of the focus ring 22 set on the lens barrel cover 21, and each key-shaped locking portion 33 of the mounting member 24 and the inner peripheral surface of the lens barrel cover 21 are inserted. Bayonet coupling is performed with each of the provided protrusions 26. That is, the mounting member 24 is inserted while being aligned, and as shown in FIG. By rotating the mounting member 24 clockwise, the convex portion 26 fits inside the key-shaped locking portion 33,
The two form a bayonet connection.

After setting the mounting member 24 in this way, as shown in FIG. 5, the stopper member 25 is mounted from the back side of the lens barrel cover 21. In this case,
The tongue portion 34 of the stopper member 25 is adjacent to the protrusion 26 adjacent to the space D between the key-shaped locking portions 33 which are bayonet-coupled.
Between the mounting members 24 in the bayonet connection.
Is prevented from rotating, and the connected state is maintained, that is, the stopper member 25 is provided at a position where the bayonet connection is not dissociated, and the mounted state is stabilized.

The stopper member 25 is inserted and attached from the rear side of the lens barrel cover 21.
Each tongue 34 is set so as to fit between any adjacent protrusions 26 in the insertion, and the bayonet-attached mounting member 2 is inserted simply by inserting the stopper member 25.
4 is prevented from rotating. At this time, the stopper member 25
If the insertion position is proper, the respective pin projections 39 of the lens barrel cover 21 will fit into the respective pin holes 38 of the stopper member 25 without hindrance, and the inserted or incorporated stopper member 25 will be distorted. And the claw 35 of the stopper member 25 is fitted into the recess 37 without hindrance, and the mounting state is properly maintained. By inserting the member 40 and screwing it into a predetermined position of the lens barrel cover 21, the entire members are completely mounted in an appropriate state.

By attaching each member as described above, the focus ring 22 and the focus gear 23 are rotatably attached to the attachment member 24 and the lens barrel cover 21. As in the case of the first embodiment, the optical detection unit 41 faces the optical detection unit 41 inside the lens barrel cover 21 and converts the degree of rotation in the right or left rotation into a pulse signal by the gear 30, thereby moving the lens unit back and forth to focus. It is.

Accessories such as a conversion lens are appropriately attached to the mounting member 24. The mounting member 24 is attached to the lens barrel cover 21 by a plurality of key-shaped locking portions 33.
And the convex portion 26, and the bayonet connection is supported by the stopper member 25 so that the rotation does not return. Therefore, the strength of the connection is remarkably improved, and the accessory has a considerable weight. However, not only is there no rattling or the like, but it is also resistant to external impacts such as vibration and dropping.

Further, as shown in FIG. 6, when the attachment of each member is completed,
The contact between the mounting member 24 and the focus ring 22 and the focus gear 23 due to the provision of the grease pool groove 24a of the stripe and the extension of the key-shaped locking portion 33 for bayonet connection. The length from the portion (corresponding to the body portion of the mounting member 24), that is, the grease application portion for rotational torque to the free end of the key-shaped locking portion 33 is increased,
By increasing the creeping distance from the grease application section to the lens 42, grease leakage hardly occurs, and lens dirt due to grease can be eliminated.

In any case, the focus ring mounting structure according to the present invention provides the mounting member 2 for the focus ring 22.
4 and the barrel cover 21 on the optical device side are connected by a bayonet connection by rotation at a predetermined angle without using a screw, so that the bayonet connection is not dissociated, that is, the rotation is not returned. Stopper member 2
In this case, the stopper member 25 is simply inserted into the stopper member 25 from the rear side of the lens barrel cover 21 and assembled, so that the workability of the entire assembly is remarkably easy.

[0026]

As described above, the mounting structure of the focus ring in the optical device according to the present invention is an optical device having a lens to which the focus ring is mounted via the mounting member, and the mounting member and the optical device. The side is
By using a configuration in which multiple key-shaped locking portions and projections are connected by bayonet connection, unlike the connection using screws like the conventional example, it is resistant to external shocks due to vibration, drop, etc. Not only is it possible to obtain a connection strength that does not generate, but also because there is no need to increase the thickness of the member at the bayonet connection portion, there is an excellent effect that the whole can be reduced in size (small diameter).

Further, since the focus ring mounting structure according to the present invention is configured by bayonet coupling between the plurality of key-shaped locking portions and the convex portions, the creepage distance from the grease application portion of the mounting member to the lens is reduced. By making the length longer, grease leakage hardly occurs, and an excellent effect that lens dirt due to grease can be eliminated is exhibited.

[Brief description of the drawings]

FIG. 1 is an exploded side view showing constituent members of a focus ring mounting structure in an optical apparatus according to an embodiment of the present invention.

FIG. 2 is an enlarged front view showing only a lens barrel cover on the optical device side in the focus ring mounting structure.

FIG. 3 is a perspective view separately showing constituent members to be assembled to a lens barrel cover in the focus ring mounting structure.

FIG. 4 is a rear view showing a state where some of the constituent members are assembled to a lens barrel cover in the focus ring mounting structure.

FIG. 5 is a rear view showing a state in which all of the constituent members are assembled to the lens barrel cover in the focus ring mounting structure, and the lens barrel cover is completed.

FIG. 6 is an enlarged cross-sectional view showing a lens barrel cover in a state in which all of the components are assembled to the lens barrel cover in the focus ring mounting structure.

FIG. 7 is an enlarged cross-sectional view showing a completed lens barrel cover in a conventional focus ring mounting structure.

FIG. 8 is an enlarged front view showing only a lens barrel cover in the focus ring mounting structure of the conventional example.

[Explanation of symbols]

Reference Signs List 20 front panel (camcorder); 21 lens barrel cover; 22 focus ring; 23 focus gear; 24 mounting member called filter screw;
Grease collecting groove; 25 stopper member; 26 convex portion; 27 groove portion; 28, 32 flange portion;
Small hole; 30 gear portion; 31 pin-shaped small protrusion; 33
Key-like locking part; 34 Tongue part; 35 Claw part; 36
Screw fixing boss; 37 recess; 38 pin hole; 3
9 pin protrusion; 40 screw; 41 optical detection unit;
42 lens; D predetermined interval.

Claims (5)

[Claims] 1. An optical device having a lens to which a focus ring is mounted via a mounting member, wherein the mounting member and the optical device side are connected to each other by bayonet coupling of a plurality of key-shaped locking portions and convex portions. A focus ring mounting structure in an optical device, wherein the focus ring is connected. 2. A mounting structure for a focus ring in an optical device according to claim 1, wherein a stopper member is provided at a position where the bayonet connection is not released. 3. The focus ring mounting structure according to claim 1, wherein a focus gear is incorporated into the focus ring in a non-rotational state. 4. The focus ring mounting structure according to claim 1, wherein a grease collecting groove is provided in a circumferential direction of the body of the mounting member. 5. The focus ring of the optical device according to claim 2, wherein the stopper member has an arc shape and includes a plurality of tongue-shaped portions, a locking claw portion, and a screw boss portion. Mounting structure.