JP2567739Y2 - Lens frame attachment / detachment mechanism - Google Patents

Description

[Detailed description of the invention]

[0001]

The present invention relates to a lens barrel,
The present invention relates to a lens frame attaching / detaching mechanism for attaching / detaching a lens frame.

[0002]

2. Description of the Related Art Conventionally, a mechanism for attaching or detaching a lens to or from a lens barrel of a camera includes:
In general, a screw or a bayonet is used, that is, the lens frame is rotated by rotating the lens frame with respect to the lens barrel. The attachment / detachment method of attaching or detaching the lens frame by rotating it with respect to the lens barrel is most suitable when the lens barrel side is held by hand or fixed to something like a jig. This is an effective method, and there is little risk of impairing the lens performance.

[0003]

However, in the above-described method of rotating and detaching the lens frame, for example, the function of rotating the lens barrel with respect to the holder holding the lens barrel. In addition, when the lens barrel cannot be picked up by hand, there is a problem that attaching and detaching the lens frame becomes extremely difficult. Accordingly, the present invention has been made in view of the above-described problem, and an object of the present invention is to easily hold a lens frame with respect to a lens barrel even in a case where the lens barrel cannot be held without being rotated. An object of the present invention is to provide a lens frame attaching / detaching mechanism that can be attached / detached.

[0004]

In order to solve the above-mentioned problems and achieve the object, a mechanism for attaching and detaching a lens frame according to the present invention includes:
A lens frame attachment / detachment mechanism for attaching / detaching a holding mechanism holding a lens frame to / from a lens barrel, wherein the holding mechanism includes a first guide portion extending along an optical axis. A first sliding member having a main body, a second guide portion that fits into the first guide portion, slides along the first guide portion, and extends along the optical axis; A second latching pin extending along an axis, sliding along the second guide portion, and having a first latching pin located at a substantially distal end portion and a second latching pin located at a substantially intermediate portion; A slide member, provided on the attachment / detachment mechanism main body, and locking the second latch pin, thereby moving the second slide member with the movement of the attachment / detachment main body in a direction along the optical axis. A first locking lever that slides toward the lens barrel. The lens barrel includes a second locking lever for locking the first locking pin, and the detachable mechanism main body is moved by a predetermined amount in a mounting direction along the optical axis with respect to the lens barrel. And then slightly slide in the opposite direction to move the first latch pin into the second
And the lens frame is fixed to the lens barrel. Further, in the lens frame attaching / detaching mechanism according to the present invention, the first attaching / detaching mechanism body is slid slightly in the mounting direction with respect to the lens barrel, and then is slid in the opposite direction, whereby the first
The locking pin is disengaged from the second locking lever, and the lens frame is removed from the lens barrel.

[0005]

As described above, since the lens frame attaching / detaching mechanism according to the present invention is constituted, when the lens frame is attached to and detached from the lens barrel, the lens frame is not rotated with respect to the lens barrel. Since the lens barrel can be attached and detached only by the operation of sliding in the direction of the optical axis, the lens frame can be easily attached and detached even when the lens barrel cannot be held so as not to rotate.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a side sectional view showing the structure of a lens frame attaching / detaching mechanism according to one embodiment. First, a schematic function of a lens frame attaching / detaching mechanism according to an embodiment will be described. In FIG. 1, a camera-side lens barrel 9 located on the right side in the drawing has a substantially cylindrical shape with an optical axis as a central axis. The lens frame attaching / detaching mechanism according to one embodiment has a shape for attaching and detaching the lens frame 11 to and from the lens barrel 9. As a method of this attachment and detachment,
The attachment / detachment mechanism body 1 is slid along the optical axis by a fixed amount with respect to the lens barrel 9 with respect to the lens barrel 9 as shown by the arrow in the figure, and then slightly returned in the direction opposite to the arrow. The lens frame 11 is fixed to the lens barrel 9. Similarly, the attachment / detachment mechanism main body 1 is slightly slid again in the direction indicated by the arrow, and then returned in the direction opposite to the arrow, whereby the lens barrel 11 is moved to the lens barrel 12.
Is removed from the

The attachment / detachment mechanism main body 1 is constructed by the above-described procedure.
It is fixed to the lens barrel 9. When the attachment / detachment mechanism main body 1 is fixed to the lens barrel 9, the right end face of the positioning portion 11 c of the lens frame 11 urged rightward in the drawing by the compression spring 10 with respect to the attachment / detachment mechanism main body 1, The lens frame 11 is held in contact with the step 9 a of the lens barrel 9, and the lens frame 11 is fixed to the lens barrel 9.

The construction of a lens frame attaching / detaching mechanism having the above-described functions will be described with reference to FIGS. First, in FIG. 1, the camera-side lens barrel 9 is formed in a cylindrical shape centered on the optical axis as described above.
On the outer peripheral surface of the left end portion of the lens barrel 9 in the figure, a second latch lever for latching the first latch pin 3a of the second slide member 3 on the lens frame side, which will be described in detail later. 8 are provided.

Next, from the outside of the lens barrel 9, the attaching / detaching mechanism 1
The configuration of the attaching / detaching mechanism will be described in more detail with reference to FIG. As shown, the detachable mechanism main body 1 is formed with a first guide portion 1a extending in a direction along the optical axis and having a width changed in five steps. The first guide portion 1a has a substantially flat first slide member 5 in a state where the outside of the ear portion 5a is fitted to the guide portion 1a1.
Is inserted. The first slide member 5 is urged rightward in the figure by a compression spring 6 with respect to the detachable mechanism main body 1. In a normal state, the ear 5a of the first slide member 5 is in contact with the step 1a2 of the first guide 1a so as not to fall off the detachable mechanism main body 1. With such a configuration, the first guide member 5 is slidable along the optical axis in a direction (leftward in the drawing) drawn into the detachable mechanism main body 1 while being guided by the guide portion 1a1. I have.

A guide groove 5b is formed at the center of the first slide member 5, and a second slide member 3 made of a spring material is slidable in the guide groove 5b in a direction along the optical axis. It is installed. The second slide member 3 is formed in a T-shape, and a compression spring 7 disposed between the right end face of the T-shaped head in the figure and the left end face of the first slide member 5. Is biased in a direction (left direction in the drawing) to be drawn into the detachable mechanism main body 1. The first locking pin 3a is fixed to the distal end of the second slide member 3 in a state of extending in a direction toward the inside of the lens barrel 9 (a direction toward the other side of the paper). When the first latch pin 3a is latched by the latch portion 5c fixed to the first slide member 5, the first latch pin 3a is pulled leftward with respect to the first slide member 5 from the position shown in FIG. Has been blocked.

The second slide member 3 is provided with a second locking member at a position on the left side of the position where the first locking pin 3a is fixed.
The locking pin 3b is fixed in a state of extending in a direction toward the outside of the lens barrel 9 (a direction toward the near side of the drawing). On the other hand, although the details will be described later,
The second locking pin 3b is locked, and the second slide member 3 is moved to the first position as the attachment / detachment mechanism body 1 moves rightward in the drawing.
First for moving to the right with respect to the slide member 5
A latch lever 2 is provided.

The first latch lever 2 is rotatably supported in the drawing by a fixing pin 1b, and is urged in a counterclockwise rotation direction in the figure by a leaf spring 1c fixed to the attaching / detaching mechanism main body 1. ing. On the other hand, the first slide member 5 has the first
A leaf spring 4 for urging the locking lever 2 in the clockwise direction is fixed. The position of the leaf spring 4 is defined by a stopper pin 5e, so that the first latch lever 2 is not rotated clockwise from the position shown in FIG. On the other hand, the urging force of the leaf spring 1c in the counterclockwise direction is sufficiently weaker than the urging force of the leaf spring 4 in the clockwise direction.
Therefore, in a state where the plate spring 4 is in contact with the leaf spring 4, the position is stable at the position shown in FIG.

On the other hand, the lens barrel 9 is provided with a second locking lever 8 which is rotatable about a fixed pin 9a in the plane of the drawing. The second latching lever 8 is formed with an inclined portion 8a at the left end thereof, and at the right side thereof,
A locking surface 8b for locking the first locking pin 3a is formed. Further, on the right side, there is formed a standing bent portion 8c which is bent obliquely toward the other side with respect to the paper surface. The second latch lever 8 is provided with a lens barrel 9.
Are biased in the clockwise direction by a spring 9b fixed to the pin and the rotation is restricted by a stopper pin 9c. Therefore, in a normal state, the position is stable at the position shown in FIG.

The operation of attaching and detaching the lens frame 11 to and from the lens barrel in the lens frame attaching / detaching mechanism configured as described above will be described with reference to FIGS. First, in FIG. 2 showing a stage before mounting the lens frame 11, the attachment / detachment mechanism main body 1 is moved rightward in the figure. When the attachment / detachment mechanism body 1 is moved rightward,
The first latch lever 2 attached to the first latch lever 2 also moves rightward integrally with the attachment / detachment mechanism main body 1, and the first latch lever 2
Engages with a second locking pin 3b fixed to the second slide member 3. The leaf spring 4 attached to the first slide member 5 is in contact with the first latch lever 2 until immediately before the first latch lever 2 is engaged with the second latch pin 3b, and the first latch is held. The posture of the lever 2 is maintained. FIG. 3 shows a state where the first latch lever 2 is engaged with the second latch pin 3b. FIG. 8 shows this state when viewed from the side.

In the state shown in FIG. 3, the first latch lever 2 is disengaged from the leaf spring 4 attached to the first slide member 5, so that the first latch lever 2 is attached to the detachable mechanism main body 1. Receives only the urging force of the leaf spring 1c attached to the first spring. However, the first latch lever 2 has already
The first locking lever 2 is engaged with the locking pin 3b.
Does not rotate due to the urging force of the leaf spring 1c. Also, as shown in FIG. 1, the lens frame 11 has an outer peripheral portion of the positioning portion 11c already fitted in the positioning portion 9b of the lens barrel 9, and a right end portion of the positioning portion 11c has a lens mirror. It is in contact with the step 9 a of the barrel 9 and is positioned with respect to the lens barrel 9.

When the attachment / detachment mechanism main body 1 is further moved rightward from the state shown in FIG.
However, the second slide member 3 moves rightward integrally with the attachment / detachment mechanism main body 1 in a state where the second latch pin 3b is locked.
With this movement, the first latching pin 3a provided at the tip of the second slide member 3 is moved to the slope 8 of the second latching lever 8.
a, the second latch lever 8 is rotated counterclockwise against the urging force of the spring 9b, and enters the recess 8d of the second latch lever. FIG. 4 shows this state.

In the state shown in FIG. 4, the ear 5a of the second slide member 5 is in contact with the step 1a3 of the first guide 1a. You cannot move in any direction. From this state, the detachable mechanism main body 1 is returned to the left. Then, the first latching pin 3a is latched on the latching surface 8b of the second latching lever 8, and is in a state as shown in FIG. In this state, since the right end face of the T-shaped head of the second slide member 3 is in contact with the step 1a4 of the first guide portion, the attachment / detachment mechanism main body 1 includes the compression spring shown in FIG. The second slide member 3 is latched by the T-shaped head of the second slide member 3 while being urged leftward by the urging force of the compression spring 6 shown in FIG. Accordingly, the attachment / detachment mechanism main body 1 includes the second latch lever 8.
It is locked to the lens barrel 9 via the and the second slide member 3. The lens frame 11 is also fixed while being positioned with respect to the lens barrel 9 as shown in FIG. By the above operation, the lens frame 11 is fixed to the lens barrel 9.

Next, referring to FIG. 5 to FIG.
An operation of detaching the lens 1 from the lens barrel 9 will be described.
First, the detachable mechanism main body 1 is moved rightward from the state shown in FIG. During this movement, the first latch lever 2 comes off the leaf spring 4 fixed to the first slide member 5, so that the first latch lever 2 is attached to the plate fixed to the detachable mechanism main body 1. It is rotated counterclockwise by the urging force of the spring 1c, and is positioned by a stopper (not shown) provided on the attachment / detachment mechanism main body 1, so that the posture is as shown in FIG. In this state, the first latching lever 2 is provided with the second latching pin 3b by the concave portion 2a provided at the tip thereof.
Is locked. Therefore, as shown in FIG. 6, when the attachment / detachment mechanism main body 1 is moved rightward to the same position as the position shown in FIG. 4, the second slide member 3 becomes more than the position shown in FIG. It will protrude rightward. At this time, as described above, since the second slide member 3 is formed of a spring material, the first hook fixed to the distal end of the second slide member 3 as shown by the two-dot chain line in FIG. Stop pin 3
a moves upward along the bent portion 8 c of the second latch lever 8 and rides on the upper surface of the second latch lever 8. FIG. 6 shows a state in which the first latching pin 3 a has climbed on the upper surface of the second latching lever 8.

From this state, the detachable mechanism main body 1 is moved to the left. In the process of this movement, the first latch pin 3a slides on the upper surface of the second latch lever 8 and moves to the left. This movement continues until the first latch pin 3a comes into contact with the stopper 5c fixed to the first slide member 5, and finally reaches the state shown in FIG. In this state, the attachment / detachment mechanism main body 1 has already been removed from the lens barrel 9, and the lens frame 11 has been removed from the lens barrel 9.

As described above, in the lens frame attaching / detaching mechanism of the embodiment, the lens frame is not rotated and attached to the lens barrel, but is slid in the direction along the optical axis with respect to the lens barrel. Since the lens barrel is mounted so as to be attached, the lens frame can be easily attached and detached even when the lens barrel cannot be held without rotating. In addition,
The present invention can be applied to a modification or modification of the above embodiment without departing from the gist thereof.

[0021]

As described above, according to the lens frame attaching / detaching mechanism of the present invention, when the lens frame is attached to and detached from the lens barrel, the lens frame does not rotate with respect to the lens barrel. Since attachment and detachment can be performed only by the operation of sliding in the optical axis direction, even when the lens barrel cannot be held so as not to rotate, the attachment and detachment of the lens frame can be easily performed.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing a partial configuration of a lens frame attaching / detaching mechanism according to an embodiment.

FIG.

FIG.

FIG.

FIG. 5 is a diagram illustrating an operation of attaching a lens frame to a lens barrel.

FIG.

FIG. 7 is a view showing an operation of removing a lens frame from a lens barrel.

FIG. 8 is a side view showing the structure of the attachment / detachment mechanism.

[Explanation of symbols]

 Reference Signs List 1 attachment / detachment mechanism main body 2 first latch lever 3 second slide member 4 leaf spring 5 first slide member 6 compression spring 7 compression spring 8 second latch lever 9 lens barrel 10 compression spring 11 lens frame 12 guide shaft

Claims (2)

(57) [Scope of request for utility model registration] 1. A lens frame attaching / detaching mechanism for attaching / detaching a holding mechanism holding a lens frame to / from a lens barrel, wherein the holding mechanism includes a first guide extending along an optical axis. A first attaching / detaching mechanism main body having a first portion, a second guiding portion which fits into the first guide portion, slides along the first guide portion, and extends along the optical axis. A slide member, extending along the optical axis, sliding along the second guide portion, and a first latch pin located at a substantially distal end portion, and a second latch pin located at a substantially intermediate portion. The second with
The second slide member is provided on the attachment / detachment mechanism main body, and locks the second latch pin, so that the second slide member is moved with the movement of the attachment / detachment body in the direction along the optical axis. A first locking lever that slides toward the lens barrel, the lens barrel includes a second locking lever for locking the first locking pin, The mechanism main body is slid in the mounting direction along the optical axis by a predetermined amount with respect to the lens barrel, and then slightly slid in the opposite direction, whereby the first locking pin is moved to the second locking lever. Wherein the lens frame is fixed to the lens barrel. 2. The first attachment pin is slid slightly in the mounting direction with respect to the lens barrel, and then is slid in the opposite direction, thereby moving the first engagement pin to a second engagement lever. The lens frame attaching / detaching mechanism according to claim 1, wherein the lens frame is detached from the lens barrel and detached from the lens barrel.