JPH0968737A - Barrier opening and closing mechanism - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To provide a barrier opening / closing mechanism capable of reliably closing barrier blades even if a small foreign matter such as sand enters. A barrier blade that opens and closes an imaging opening of a lens barrel, a drive member that drives the barrier blade to open and close, and a barrier member that interlocks with the drive member, and the drive member includes the interlocking member. A barrier opening / closing mechanism having a drive unit for driving the unit, wherein a barrier member is provided between the interlocking unit formed on the barrier blade and the drive unit formed on the drive member.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a barrier opening / closing mechanism provided on the front surface of a lens for protecting a photographing optical system.

[0002]

2. Description of the Related Art FIGS. 17 to 19 show a conventional example.

FIG. 17 is a front view showing a state in which the barrier blades are closed, and FIGS. 18 (A) and 18 (B) are detailed views and diagrams showing the relationship between the drive shaft and the notch of the barrier ring in FIGS. 17A and 17B. 1
9 is a front view showing a state in which foreign matter (sand, dust) has entered and the barrier blades have closed during the operation.

Referring to FIGS. 17 to 19, the conventional barrier opening / closing mechanism has an interlocking shaft 4 embedded in the barrier blades 4 and 5.
b and 5b are notches 3 formed in the barrier ring 3.
shafts 4c and 5c, which are incorporated in a and 3b and are planted in the barrier blades 4 and 5, and hooks 3d formed in the barrier ring 3,
As shown in FIGS. 18 (A) and 18 (B), by the spring force of the barrier springs 7 and 8 hung on 3e, the interlocking shaft 4
The d and 5d are brought into contact with the end faces 3g and 3h of the cutout portions 3a and 3b, and the barrier blades 4 and 5 are opened and closed by interlocking with the rotation of the barrier ring 3.

[0005]

However, in the above-mentioned conventional example, when the barrier blades 4, 5 are closed, the foreign matter 13 enters the gap between the barrier blades 4, 5 and the rail surface 12b of the barrier cover 12, As shown in FIG. 19, the barrier blades 4 and 5 stop while covering the photographing optical system.
When the spring force of the barrier springs 7 and 8 is increased in order to prevent the barrier blades 4 and 5 from stopping halfway, the barrier ring 3 is moved counterclockwise (the barrier blades 4 and 5).
It is necessary to strengthen the barrier ring spring 6 for urging the method of opening 5), and there is a disadvantage that the load for operating the lens barrel during the barrier closing operation becomes heavy.

In order to solve such a conventional problem, the present invention provides a barrier opening / closing mechanism capable of reliably closing the barrier blade even if a small foreign matter such as sand enters.

[0007]

In order to achieve the above-mentioned object, the invention according to the claims comprises a barrier blade for opening and closing a photographing opening of a lens barrel, and a drive member for driving the barrier blade to open and close. In the barrier opening / closing mechanism, wherein the barrier blade has an interlocking portion that interlocks with the drive member, and the drive member has a drive portion that drives the interlocking portion, in the interlocking portion formed on the barrier blade and the drive member. It is characterized in that an elastic member is provided between the formed drive unit and the drive unit. Also, the elastic member provided between the interlocking portion formed on the barrier blade and the driving portion formed on the driving member is integrated with the driving member.

According to the above-mentioned structure, the elastic member is provided between the interlocking portion formed on the barrier blade and the driving portion formed on the driving member. Further, by integrating the elastic member provided between the interlocking portion formed on the barrier blade and the driving portion formed on the driving member with the driving member, small foreign matter such as sand may enter. Even if the barrier closing operation (collapse operation) is performed, the barrier blade is surely closed without increasing the load of the barrel.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION

(First Embodiment) FIGS. 1 to 7 show a first embodiment of the present invention.

FIG. 1 is a front view showing the state in which the barrier blades are opened, FIGS. 2A and 2B are detailed views showing the relationship between the drive shafts and leaf springs of the portions A and B in FIG. 1, and FIG. 3 is the barrier blades. Is a front view showing a closed state, FIGS. 4 (A) and 4 (B) are detailed views showing the relationship between the drive shafts and leaf springs of the parts A and B of FIG. 3, and FIG.
(Dust) has entered, and the barrier blade has been closed and stopped in the middle of the operation. FIG. 6A and FIG. 6B are detailed views showing the relationship between the drive shaft and the leaf spring in FIGS. 5A and 5B. 7 is a sectional view showing the state of FIG.

1 to 7, reference numeral 1 denotes a fixed barrel, which supports the entire lens barrel and is fixed to a camera body (not shown) with screws. A taper portion 1a for rotating the barrier ring 3 in the clockwise direction is provided on the inner circumference.

Reference numeral 2 denotes a lens barrel frame, which covers the photographing optical system and is a fixed barrel 1.
It is arranged on the outer circumference of and moves straight in the optical axis direction. Upper surface 2
A photographing opening 2b is formed in a, barrier blade shafts 2c and 2d into which the barrier blades 4 and 5 are rotatably fitted, and a shaft 2e on which the barrier ring spring 6 is hung are planted, and a drive unit of the barrier ring 3 is formed. A hole 2f through which 3f penetrates is formed.

A barrier ring 3 is rotatably fitted to the outer periphery of the photographing opening 2b of the lens barrel frame 2, and opens and closes the barrier blades 4 and 5. Notches 3a3b for rotating and driving the barrier blades 4, 5, outer hooks 3c for hooking the barrier ring spring 6, and barrier springs 7, 8
Hooks 3d and 3e for hanging on and a taper drive part 3f are formed. The barrier ring 3 is rotated counterclockwise by the barrier ring spring 6, and the drive portion 3f of the barrier ring 3 is rotated clockwise along the taper portion 1a of the fixed barrel 1.

Numerals 4 and 5 are barrier blades which are arranged on the upper surface of the barrier ring 3, and holes 4a and 5a are rotatably fitted to the barrier blade shafts 2c and 2d of the lens barrel frame 2, respectively. On the lower surface, the end faces 3 of the cutouts 3a, 3b of the barrier ring 3 are formed.
Interlocking shafts 4b and 5b which are in contact with g and 3h and interlock with the rotation of the barrier ring 3 are planted, and shafts 4c and 5c for hanging the barrier springs 7 and 8 are planted on the upper surface portion. When the barrier ring 3 rotates counterclockwise, the barrier blades 4,
Reference numeral 5 rotates clockwise around the holes 4a and 5a, and as shown in FIG. 1, the barrier blades 4 and 5 are opened and the photographing is possible.

When the barrier ring rotates clockwise, the barrier blades 4 and 5 rotate counterclockwise around the holes 4a and 5a, and the barrier blades 4 and 5 are closed as shown in FIG. cover.

Reference numeral 6 is a barrier ring spring, one end of which is a hook 3c of the barrier ring 3 and the other end of which is a shaft 2e of the lens barrel frame 2.
To urge the barrier ring 3 counterclockwise (barrier opening direction).

Reference numerals 7 and 8 denote barrier springs. One end is hooked on the hooks 3d and 3e of the barrier ring 3 and the other end is hooked on the shafts 4c and 5c of the barrier blades 4 and 5, respectively.
5 drive shafts 4b, 5b of the barrier ring 3 notch 3
It is brought into contact with the end faces 3g and 3h of a and 3b.

Reference numerals 9 and 10 denote leaf springs, which are fixed to the barrier ring 3 by pins 11 and rotate integrally with the barrier ring 3. The arms 9a and 10a are shown in FIGS.
As shown in (A) and (B), the drive shafts 4b and 5b and the gap L
Is arranged. Also, the arms 9a and 10a
The drive shafts 4b and 5b using the spring force of the notch 3
The barrier springs 7 and 8 can be eliminated by contacting the end faces 3g and 3h of a and 3b.

A barrier cover 12 is fixed to the lens barrel frame 2 and covers the barrier blades 4 and 5. The barrier cover 12 is formed with a photographing opening 12a and a rail surface 12b on which the barrier blades 4 and 5 slide.

Reference numeral 13 is a foreign substance (sand, dust).

The operation of the above configuration will be described.

When the barrier blade shown in FIG. 1 is opened and closed, the main SW is turned off to move the lens barrel 2 rectilinearly rearward through a motor (not shown) and a drive member. The barrier ring 3 is the drive unit 3
Since f comes into contact with the taper portion 1a of the fixed barrel 1 and then moves along the taper portion 1a, it rotates clockwise while charging the barrier ring spring 6 around the photographing opening 2b of the lens barrel frame 2. . At this time, as shown in FIGS. 4A and 4B, the arm portions 9a and 10a of the leaf springs 9 and 10 keep the gap L between the barrier blades 4 and 5 and the drive shafts 4b and 5b, respectively. Rotates together with. The barrier blades 4 and 5 are driven by the spring forces of the barrier springs 7 and 8 so that the drive shafts 4 b and 5 b are notched in the barrier ring 3.
Since they are in contact with the end faces 3g, 3h of a, 3b, they rotate counterclockwise around the holes 4a, 5a in conjunction with the rotation of the barrier ring 3, and as shown in FIG. Closes and covers the shooting optics.

On the other hand, when the barrier blade shown in FIG. 3 is opened from the closed state, by turning on the main SW, the lens barrel frame 2 moves straight forward through a motor and a driving member (not shown). Then, the barrier ring 3 is rotated clockwise around the photographing opening 2b of the lens barrel frame 2 by the spring force of the barrier ring spring 6. This time,
The arm portions 9a and 10a of the leaf springs 9 and 10 are shown in FIGS.
As shown in FIG. 3, the barrier blades 4 and 5 rotate integrally with the barrier ring 3 while maintaining the gap L between the drive shafts 4b and 5b of the barrier blades 4 and 5. In addition, since the interlocking shafts 4b and 5b are pushed by the end faces 3g and 3h of the cutouts 3a and 3b of the barrier ring 3, the barrier blades 4 and 5 rotate clockwise around the holes 4a and 5a, as shown in FIG. As shown, the barrier blades 4 and 5 are opened, and the photographing is possible.

In the closing operation of the barrier blades 4 and 5, as shown in FIG. 7, the barrier blades 4 and 5 and the barrier cover 12 are arranged.
When the foreign matter 13 enters the gap between the rail surface 12b and the barrier blades 4 and 5 as shown in FIG. 5 and stops while covering the photographing optical system, the barrier ring 3 charges the barrier springs 7 and 8. At the same time, as shown in FIGS. 6A and 6B, the drive shafts of the barrier blades 4 and 5 in which the arm portions 9a and 10a of the leaf springs 9 and 10 rotating integrally with the barrier ring 3 are stopped halfway. 4b and 5b are contacted, and then the arms 9a and 10a are rotated clockwise while being charged. The barrier blades 4, 5 are forcibly rotated together with the foreign matter 13 in the counterclockwise direction by the spring force of the arm portions 9a, 10a charged during the rotation, and then the barrier springs 7,
Due to the spring force of 8, the drive shafts 4b and 5b come into contact with the end faces 3g and 3h of the cutouts 3a and 3b of the barrier ring 3, and the barrier blades 4 and 5 cover the photographing optical system as shown in FIG. The arm portions 9a and 10a of the leaf springs 9 and 10 are shown in FIG.
Return to the original as shown in (A) and (B).

In this way, according to the first embodiment, the leaf springs 9 and 10 are attached to the barrier ring 3 and are rotated integrally with the barrier ring 3, and the barrier blades 4 and 5 stop during the closing operation. At this time, the spring force of the arms 9a and 10a formed on the leaf springs 9 and 10 causes the barrier blades 4 and 5 to move.
Therefore, even if a small foreign matter such as sand enters between the barrier blades 4 and 5 and the rail surface 12b of the barrier cover 12, the barrier closing failure does not occur.

(Second Embodiment) FIGS. 8 to 12 show a second embodiment of the present invention.

FIG. 8 is a front view showing the state in which the barrier blades are closed, FIGS. 9A and 9B are detailed views showing the relationship between the drive shaft and the absorbing rubber in FIGS. 8A and 8B, and FIG. 10 is the drive shaft. And FIG. 11A is a front view showing a state in which foreign matter (sand, dust) has entered and the barrier blade has stopped during the closing operation, and FIG. 12A and FIG. 3 is a detailed view showing a relationship between a drive shaft of a B section and an absorbing rubber. FIG.

In FIGS. 8 to 12, the same functions as those in the first embodiment are represented by the same numbers.

The present embodiment differs from the first embodiment in that edges 3g, 3 of the cutouts 3a, 3b formed in the barrier ring 3 against which the barrier blades 4, 5 abut.
L-shaped standing bent portions 3i and 3j are provided on the opposite side of h. Further, rubber 20 and 21 are newly provided, and as shown in FIG. 10, it is only attached to the bent portions 3i and 3j of the barrier ring 3 and rotated integrally with the barrier ring 3.

Others are the same as those of the first embodiment.

The operation of the above configuration will be described.

When the barrier blade is closed from the opened state, the main SW is turned off to move the lens barrel frame 2 straight rearward through the motor and the drive member (not shown), and the barrier ring 3 is driven. Part 3f is fixed cylinder 1
Since it abuts on the tapered portion 1a, and then moves along the tapered portion 1a, it rotates clockwise while the barrier ring spring 6 is charged around the photographing opening 2b of the lens barrel frame 2. At this time, the rubbers 20 and 21 are shown in FIG.
Similarly to (B), the barrier blades 4 and 5 rotate integrally with the barrier ring 3 while maintaining the gap L between the drive shafts 4b and 5b of the barrier blades 4 and 5. In addition, the barrier blades 4 and 5 are driven by the spring force of the barrier springs 7 and 8 so that the drive shafts 4b and 5b are in contact with the end surfaces 3g and 3h of the cutout portions 3a and 3b of the barrier ring 3, respectively. It rotates counterclockwise around the holes 4a, 5a in conjunction with the rotation, and as shown in FIG. 8, the barrier blades 4, 5 are closed to cover the photographing optical system.

On the other hand, when the barrier blade shown in FIG. 8 is opened from the closed state, by turning on the main SW, the lens barrel frame 2 moves straight forward through a motor and a driving member (not shown). Then, the barrier ring 3 is rotated clockwise around the photographing opening 2b of the lens barrel frame 2 by the spring force of the barrier ring spring 6. This time,
As shown in FIGS. 9A and 9B, the rubbers 20 and 21 rotate integrally with the barrier ring 3 while maintaining the gap L between the barrier blades 4 and 5 and the drive shafts 4b and 5b. Further, the barrier blades 4 and 5 have holes 4 because the interlocking shafts 4b and 5b are pushed by the end faces 3g and 3h of the cutouts 3a and 3b of the barrier ring 3.
Rotate clockwise around a and 5a to move the barrier blades 4, 5
Opens and the camera is ready for shooting.

In the closing operation of the barrier blades 4 and 5, as shown in FIG. 7, the barrier blades 4 and 5 and the barrier cover 12 are arranged.
The foreign matter 13 enters the gap between the rail surface 12b of the
As shown in FIG. 12, when the barrier blades 4 and 5 stop in the middle of covering the photographing optical system, the barrier ring 3 charges the barrier springs 7 and 8, and as shown in FIGS. Rubber 2 rotating together with ring 3
0 and 21 come into contact with the drive shafts 4b and 5b of the barrier blades 4 and 5 that are stopped midway, and then the rubbers 20 and 21 rotate clockwise while crushing. During the rotation, the elastic force of the rubbers 20 and 21 force the barrier blades 4 and 5 to rotate in the counterclockwise direction together with the foreign matter 13, and then the spring force of the barrier springs 7 and 8 causes the drive shafts 4b and 5b to move the barriers. The contact surfaces 3g and 3h of the cutout portions 3a and 3b of the ring 3 are brought into contact with each other, and as shown in FIG. 8, the barrier blades 4 and 5 cover the photographing optical system and the rubbers 20 and 21 are shown in FIGS.
Return to the original as shown in.

In this way, according to the present embodiment,
When the rubbers 20 and 21 are attached to the barrier ring 3 and rotated integrally with the barrier ring 3, and when the barrier blades 4 and 5 stop during the closing operation, the elastic force of the rubbers 20 and 21 force the barrier blades 4 and 5. Therefore, even if a small foreign matter such as sand enters between the barrier blades 4 and 5 and the rail surface 12b of the barrier cover 12, the barrier closing failure does not occur.

(Third Embodiment) FIGS. 13 to 16 show a third embodiment of the present invention.

FIG. 13 is a front view showing a state in which the barrier blades are closed, FIGS. 14 (A) and (B) are detailed views showing the relationship between the drive shaft and the protruding portion of the parts A and B of FIG. 13, and FIG. Sand, dust) has entered, and the front view showing a state in which the barrier blades are closed and stopped during the operation, FIGS.
FIG. 6 is a detailed view showing the relationship between the drive shaft of FIG.

13 to 16, those having the same functions as those in the first embodiment are represented by the same numbers. The present embodiment differs from the first embodiment only in that the protrusions 3k and 3l are provided in the cutouts 3a and 3b formed in the barrier ring 3.

Others are the same as those of the first embodiment.

In the closing operation of the barrier blades 4 and 5, as shown in FIG. 7, the barrier blades 4 and 5 and the barrier cover 12 are arranged.
The foreign matter 13 enters the gap between the rail surface 12b of FIG.
As shown in FIG. 16, when the barrier blades 4 and 5 stop in the middle of covering the photographing optical system, the barrier ring 3 charges the barrier springs 7 and 8, and as shown in FIGS. The protrusions 3k and 3l of the ring 3 come into contact with the drive shafts 4b and 5b of the barrier blades 4 and 5 stopped halfway, and then rotate clockwise while charging the protrusions 3k and 3l. During rotation, the barrier blades 4 and 5 are forcibly rotated together with the foreign matter 13 in the counterclockwise direction by the spring force of the protrusions 3k and 3l, and then the barrier springs 7 and 8 are rotated.
Due to the spring force of the drive shafts 4b and 5b, the drive shafts 4b and 5b come into contact with the end faces 3g and 3h of the cutouts 3a and 3b of the barrier ring 3, and as shown in FIG. Parts 3k and 3l are shown in FIGS.
Return to the original as shown in.

Thus, according to the present embodiment,
Protrusions 3k and 3l are provided on the barrier ring 3, and when the barrier blades 4 and 5 are stopped during the closing operation, the protrusions 3k and 3l are provided.
Since the barrier blades 4 and 5 can be forcibly rotated by the spring force of the barrier, even if a small foreign matter such as sand enters between the barrier blades 4 and 5 and the rail surface 12b of the barrier cover 12, Does not cause poor closing.

[0042]

As described above, according to the present invention,
An elastic member is provided between the interlocking portion formed on the barrier blade and the driving portion formed on the driving member. Further, the barrier blade can be reliably closed by integrating the elastic member provided between the interlocking portion formed on the barrier blade and the driving portion formed on the driving member with the elastic member. Therefore, small foreign matter such as sand enters the barrier blade and the rail surface of the barrier cover, and the defect that the barrier blade stops in the middle of covering the shooting optical system and the load on the barrel during the barrier closing operation (collapse operation) are caused. The drawback of being heavy is eliminated.

[Brief description of drawings]

FIG. 1 is a front view showing a state in which barrier blades are opened in a first embodiment of the present invention.

FIG. 2 is a detailed view showing the relationship between the drive shaft and the leaf spring of the portions A and B in FIG.

FIG. 3 is a front view showing a state in which the barrier blade of FIG. 1 is closed.

FIG. 4 is a detailed view showing the relationship between the drive shaft and the leaf spring of the A and B portions of FIG. 2;

FIG. 5 is a front view showing a state in which a foreign substance has entered in FIG. 1 and the barrier blade has stopped during the closing operation.

FIG. 6 is a detailed view showing the relationship between the drive shaft and the leaf spring of the A and B portions of FIG. 5;

7 is a cross-sectional view showing the state of FIG.

FIG. 8 is a front view showing a state in which the barrier blade is closed in the second embodiment of the invention.

FIG. 9 is a detailed view showing the relationship between the drive shaft and the absorbing rubber in the A and B parts of FIG. 8;

10 is a cross-sectional view showing the relationship between the drive shaft and the absorption rubber in FIG.

FIG. 11 is a front view showing a state in which a foreign substance has entered in FIG. 8 and the barrier blade has stopped during the closing operation.

FIG. 12 is a detailed view showing the relationship between the drive shaft and the absorbing rubber in the A and B portions of FIG. 11;

FIG. 13 is a front view showing a state in which the barrier blade is closed in the third embodiment of the invention.

FIG. 14 is a detailed view showing the relationship between the drive shaft and the protrusions of the portions A and B of FIG. 13;

FIG. 15 is a front view showing a state in which foreign matter has entered in FIG. 13 and the barrier blade has stopped during the closing operation.

FIG. 16 is a detailed view showing the relationship between the drive shaft and the protrusions of the parts A and B of FIG. 15;

FIG. 17 is a front view showing a state in which barrier blades are closed in a conventional example.

FIG. 18 is a detailed view showing the relationship between the drive shaft and the barrier ring cutout portion of the portions A and B of FIG. 17;

FIG. 19 is a front view showing a state in which foreign matter has entered in FIG. 17 and the barrier blade has stopped during the closing operation.

[Explanation of symbols]

 1 Fixed barrel 2 Lens barrel frame 3 Barrier ring (driving member) 3a, 3b Cutout portion (driving portion) 3g, 3h End face 3i, 3j Standing bent portion 3k, 3l Projection portion 4, 5 Barrier blade 4b, 5b Interlocking shaft ( Interlocking part) 6 Barrier ring spring 7, 8 Barrier spring 9, 10 Leaf spring 9a, 10a Arm part 11 Pin 12 Barrier cover 12b Rail surface 13 Foreign matter (sand, dust) 20, 21 Rubber

Claims (2)

[Claims] 1. A barrier blade that opens and closes a photographing opening of a lens barrel, a drive member that drives the barrier blade to open and close, and a barrier member that interlocks with the drive member. A barrier opening / closing mechanism having a drive unit for driving the interlocking unit, wherein an elastic member is provided between the interlocking unit formed on the barrier blade and the drive unit formed on the drive member. mechanism. 2. The elastic member according to claim 1, wherein an elastic member provided between an interlocking portion formed on the barrier blade and a driving portion formed on the driving member is integrated with the elastic member. Barrier opening and closing mechanism.