JPH10312003A - Barrier opening and closing device and camera - Google Patents

Abstract

(57) [Problem] To reduce the size and thickness of a driving mechanism of a barrier blade that opens and closes the front surface of a lens of a camera. A barrier lever has a rotation axis on a plane orthogonal to an optical axis and is rotated in a barrier closing direction by a collapsing operation.
Opening spring 4 for urging the barrier member 5 in the direction in which the barrier member 5 opens and the barrier member 5
And a barrier absorbing spring 3 for transmitting the opening / closing operation to the barrier member 5. The barrier absorbing spring 3 pushes the barrier member 5 in a direction in which elastic deformation of the barrier absorbing spring 3 can be absorbed by rotation of the barrier lever 2 in the closing direction. did.

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 device and a camera, and more particularly to an improvement in a barrier driving mechanism for driving a barrier member provided in a photographing opening in the front of a lens barrel to open and close.

[0002]

2. Description of the Related Art FIGS. 8 to 10 show that when a movable lens barrel is extended to a photographing state, a barrier provided at a photographing opening in the front of a lens barrel is opened by a spring force of a normally open spring. Shows a conventional barrier opening / closing mechanism that charges the normally-open spring to close the barrier when retracted to a collapsed position stored in the camera body. FIG. 8 is a cross-sectional view of the camera showing a collapsed state, and FIG. FIG. 10 is a sectional view of the camera at a WIDE end position in a photographing state, and FIG. 10 is a front view of the barrier opening / closing device (barrier closed state).

[0003] Referring to FIGS.
The movable lens barrel 102 is attached to the fixed lens barrel 101 (which cannot move in the optical axis direction and cannot rotate around the optical axis) 101 so as to be movable in the optical axis direction. This moving barrel 10
2, a photographing lens L, a shutter SH, and a pair of barrier blades 103 are arranged. A pair of barrier blades 10
Numeral 3 is rotatably attached to a barrier base plate 104 fixed to the movable barrel 102 via a support shaft 103b extending in the optical axis direction. A ring-shaped barrier ring 105 is rotatably attached to the barrier base plate 104. Have been. The distal end surface of the fixed lens barrel 102 is formed on a cam surface. When the operation piece 105d of the barrier ring 105 comes into contact with the cam surface during the retracting operation, the barrier ring 105 is closed (rotated clockwise in FIG. 10). It is designed to rotate.

[0004] The barrier ring 105 includes a barrier base plate 104.
Is always urged in the direction of opening the barrier blade 103 (clockwise rotation in FIG. 10) by the spring force of the barrier opening spring 106, and the barrier opening spring 106 is hooked on the hook 103b of the barrier blade 103. , One end is hung on the other end, and the other end is fixed to the barrier base plate 104 so as to extend in a plane orthogonal to the optical axis.

[0005] When the state is advanced from the retracted state to the photographing state,
The operating piece 105d of the barrier ring 105 is
10 and is rotated clockwise in FIG. 10 by the spring force of the barrier opening spring 106, so that the barrier blade 103
open.

On the other hand, between the barrier ring 105 and the pair of barrier blades 103, there is provided a barrier absorption spring 106 which is pulled by the rotation of the barrier ring 105 in the closing direction and turns the barrier blade 103 in the closing direction. . The barrier absorption spring 106 is used for the barrier ring 1
05 and the hook 103a of the barrier blade 103. Since the barrier blade 103 is urged in the closing direction by the force of the barrier absorption spring 106, the barrier blade 103 and the barrier ring 1
When the barrier ring 105 rotates in the barrier opening direction, the barrier blade 103 rotates in the opening direction.

In the above configuration, the barrier blade 103
In the collapsed state with the door opened, the barrier ring 105 and the barrier blade 1 are moved by the barrier absorption spring 106.
03 to prevent the mechanical mechanism from breaking.

When the barrier blade 103 is urged in the closing direction to be in the photographing state, the barrier opening spring 10
6 opens the barrier blade 103 in a range where the force for urging the barrier ring 105 in the opening direction exceeds the force for urging the barrier ring 103 in the closing direction, thereby preventing the blade opening failure.

[0009]

However, in the above conventional example, since a tension spring is used for the barrier absorption spring 106 connecting the barrier ring 105 and the barrier blade 103, the support shaft 103b of the barrier blade 103 or the movement trajectory is used. The rotation axis or movement trajectory of the barrier ring needs to be approximately parallel, and the barrier opening spring and the barrier absorption spring are attached to the barrier ring, so the thickness in the optical axis direction is the barrier cover, barrier blade, barrier ring, barrier absorption spring ( Or a barrier opening spring), which increases the thickness of the barrier opening / closing mechanism and thus the thickness of the lens barrel in the collapsed state.

When the barrier opening spring and the barrier absorbing spring are accommodated in the thickness of the barrier blade and the ring member to reduce the thickness in the optical axis direction, the diameter of the lens barrel becomes large.

Further, according to Japanese Patent Application Laid-Open No. Hei 8-13728, the barrier blade is partially counterbored and the barrier absorbing spring is accommodated in the thickness of the barrier blade. It is an obstacle.

It is an object of the invention according to the present application to reduce the size of the lens barrel in the optical axis direction and the radial direction by making it possible to store the barrier absorption mechanism in the dead space of the shutter unit, and to make the barrier absorption mechanism a unit. It is intended to improve the assembly workability.

[0013]

SUMMARY OF THE INVENTION The barrier opening / closing device according to the present invention is configured so that the front surface of a lens barrel that moves between the collapsed state and the photographing state along the optical axis can be opened and closed. In a barrier opening / closing device having a barrier member and a barrier driving mechanism that drives the barrier member to open and close with the movement of the lens barrel, the barrier driving mechanism has a rotation axis on a plane orthogonal to the optical axis, A barrier lever that is turned in the closing direction of the barrier due to the retracting operation, a barrier opening spring that urges the barrier lever in a direction in which the barrier member opens, and a turning lever that is integrally rotated with the barrier lever and opens and closes with the barrier member A barrier absorbing spring for transmitting an operation, wherein the barrier absorbing spring is capable of absorbing elastic deformation of the barrier absorbing spring by rotating the barrier lever in a closing direction. It is obtained so as to push the barrier member countercurrent.

In such a configuration, the barrier opening spring is coaxially mounted on the barrier lever.

The barrier absorbing spring is a torsion spring having a center coaxial with a rotation axis of the barrier lever.

[0016] The barrier lever has a projection for locking and holding one arm of the barrier opening spring when the barrier opening spring is assembled.

The barrier member includes a barrier blade driven by the barrier absorption spring, and a plurality of barrier driven blades driven by the barrier blade.

Further, in the camera invention according to the present application, the barrier opening / closing device described above is provided on a lens barrel that moves along the optical axis direction between a collapsed state and a photographing state, and the lens barrel in the collapsed state. Is covered with the barrier member, and in the photographing state, the barrier member is moved in the opening direction by the spring force of the barrier opening spring.

[0019]

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 a state where the barrier blade is open, FIG. 2 is a bottom view showing a state where the barrier blade is open, and FIG.
4 is a side view showing a state where the barrier blade is open, FIG. 4 is a front view showing a state where the barrier blade is closed, FIG. 5 is a bottom view showing a state where the barrier blade is closed, and FIG. 6 is a collapsed state with the barrier blade closed. From the photographing state, the bottom view of the state in which the absorbing mechanism of the barrier opening spring is operating, and FIG. 7 shows the state in which the state is changed from the photographing state to the collapsed state with the barrier blade open, and the absorbing mechanism of the barrier absorbing spring is working. It is a bottom view.

In FIG. 1 to FIG. 7, reference numeral 1 denotes a barrier driving member which rotates by moving the lens barrel forward and backward, and 2 denotes a barrier lever.
The rotation shafts 2e and 2f are rotatably attached to the base member 8 by a bearing member (not shown) such that the rotation shafts 2e and 2f are positioned on a plane orthogonal to the optical axis. The base member 8 is attached to a moving lens barrel (not shown) (corresponding to the moving lens barrel in FIG. 8).

Further, as shown in FIG.
Is a lever portion 2g that contacts the front end surface of the barrier drive member 1.
When the movable lens barrel moves from the shooting position to the retracted state, the barrier lever 2 in the open state rotates clockwise while the lever portion 2g contacts the front end surface of the barrier drive member 1. The barrier blade 5 is rotated in the opening direction while charging the barrier opening spring 4 described later.

A barrier blade 5 and a barrier driven blade 7 are rotatably mounted on the movable lens barrel via a rotary shaft, and the barrier blades 5 and 7 have cutout recesses of a barrier connecting member 6 described later. Connection pins 5d and 7a are formed to engage with 6a and 6b, respectively.

Further, a ring-shaped barrier connecting member 6 is rotatably attached to the base member 8, and a connecting pin 5d of the barrier blade 5 is engaged with one of the notch recesses 6a at the opposing position. In addition, the connection pin 7a of the barrier driven blade 7 is engaged with the other notch recess 6b. In FIG. 1, when the barrier blade 5 rotates clockwise, the barrier connection member 6 rotates counterclockwise, This barrier connecting member 6
The counter-clockwise rotation causes the barrier driven blade 7 to rotate clockwise, and the barrier blades 5 and 7 are rotated in the closing direction. The opening direction is the reverse of the above operation.

On one rotation shaft 2 e of the barrier lever 2,
The barrier opening spring 4 is mounted. In the barrier opening spring 4, one arm 4a is engaged with the base member 8 and the other arm 4b is engaged with the engaging projection 2b of the barrier lever 2, and the barrier lever 2 is moved counterclockwise in FIG. In the direction of the barrier opening. The one arm 4a of the barrier opening spring 4 has a protrusion 2 shown in FIG.
d, and is released after the barrier lever 2 is attached.

The other rotating shaft 2f of the barrier lever 2
, A barrier absorption spring 3 is mounted, and the arms 3a and 3b at both ends are, as shown in FIGS.
The arm 3 extends in parallel toward the back side of the barrier blade 5.
The tips of a and 3b are bent in parallel with the barrier blade 5, so that the urging force acts in a direction in which the distance between the arms 3a and 3b is reduced. Barrier absorption spring 3
Is a torsion spring having a center coaxially with the rotation axis of the barrier lever 2 and rotating integrally with the barrier lever 2.

One arm 3a of the barrier absorbing spring 3
Is engaged between the engagement projections 2a and 2b of the barrier lever 2 to restrict rotation, and the other arm 3b is positioned in a state where the barrier blade 5 is charged in a direction to close the barrier blade 5 by the engagement projection 2a. Be regulated.

The operating pin 5a of the barrier blade 5 engages between the distal ends of both the arms 3a and 3b of the barrier absorption spring 3, and the barrier lever 2 is turned clockwise in FIG. The other arm 3b of the barrier absorption spring 3 is moved to the operating pin 5 of the barrier blade 5.
The barrier blade 5 is rotated in the closing direction while abutting on the a. Due to the rotation of the barrier blade 5 in the closing direction, as described above, the barrier driven blade 7 is
Will also rotate in the closing direction.

When the movable lens barrel is extended from the retracted position to the photographing position, the barrier lever 2 rotates counterclockwise in FIG. 3 by the charging force of the barrier opening spring 4, and the other arm of the barrier absorbing spring 3. The portion 3b moves the operation pin 5a of the barrier blade 5 to the left, and rotates the barrier blade 5 in the opening direction.

The movable lens barrel includes a base member 8, a barrier cover (not shown), a barrier blade 5, and a barrier follower blade 7.
Is attached.

The operation of the above configuration will be described below.

First, when the lens barrel is in the photographing state in the barrier open state shown in FIGS. 1, 2 and 3, the barrier driving member 1 is at a position away from the barrier lever 2. The barrier absorption spring 3 is moved by the other arm 3b to the barrier blade 5
In the direction in which the barrier blade 5 closes,
The operation pin 5a of the barrier blade is brought into contact with one arm 3a of the barrier absorption spring 3 fixed to the barrier lever 2.

The barrier lever 2 has a barrier opening spring 4
As a result, the barrier blade 5 is biased in the opening direction, so that the barrier blade 5 is held open by the biasing force of the barrier opening spring 4 in the opening direction. The barrier driven blade 7 is linked with the barrier blade 5 by the barrier connecting member 6, so that the barrier driven blade 7 maintains the open state similarly to the barrier blade 5.

Next, the case where the barrier shown in FIGS. 4, 5 is closed from the state in which the barrier shown in FIGS. 1, 2, and 3 is open will be described.

When the movable lens barrel moves from the photographing state to the retracted state housed in the camera body, first, the barrier driving member 1 is moved.
Turns the barrier lever 2 against the urging force of the barrier opening spring 4. The barrier absorption spring 3 rotates integrally with the barrier lever 2 because one arm 3a is fixed by the projection 2a and the projection 2c of the barrier lever 2.

Since the barrier blade 5 is urged in the closing direction by the other arm 3b of the barrier absorption spring 3, it follows the rotation of the barrier lever 2 and is closed. Since the barrier driven blade 7 is linked with the barrier blade 5 by the barrier connecting member 6, the barrier driven blade 7 is in a closed state similarly to the barrier blade 5. The barrier blade 5 closes and comes into contact with a stopper (not shown),
Further, when the barrier driving member 1 rotates the barrier lever 2, the barrier blade does not follow the rotation of the barrier lever, so that the other arm 3b of the barrier absorbing spring 3 is overcharged and the barrier driving member 1 moves. Absorb.

Next, a case will be described in which the barrier blade 5 is forcibly retracted from the photographing state while the barrier blade 5 is kept open, and the absorbing mechanism of the barrier absorbing spring shown in FIG. 7 operates.

When the movable lens barrel is collapsed from the photographing state, first, the barrier driving member 1 rotates the barrier lever 2 against the urging force of the barrier opening spring 4. The barrier absorption spring 3 rotates integrally with the barrier lever 2 because one arm 3a is fixed by the projections 2a and 2c of the barrier lever 2. Since the barrier blade 5 is forcibly opened, the other arm portion 3b of the barrier absorption spring 3 is elastically deformed, and the operating pin 5a of the barrier blade moves away from the arm portion 3a of the barrier absorption spring. 5
And the movement of the barrier lever 2 is absorbed. When the force for forcibly opening the barrier blade 5 becomes smaller than the force of the barrier absorption spring 3, the barrier blade 5 is moved to the arm 3 of the barrier absorption spring.
It is rotated and closed in the closing direction by the elastic force of b.

The closed state shown in FIGS. 4 and 5 will be described.

In the retracted state of the movable lens barrel, the barrier driving member 1 is at a position where the barrier lever 2 is turned against the urging force of the barrier opening spring 4. Barrier absorption spring 3
Is the operating pin 5a of the barrier blade 5 by the other arm 3b.
Is biased in the direction in which the barrier blade 5 is closed, and the operating pin 5a of the barrier blade 5 is brought into contact with one arm 3a of the barrier absorption spring fixed to the barrier lever 2.

Since the barrier blade 5 is in contact with one arm 3a of the barrier absorption spring 3, it follows the barrier lever 2 and maintains the closed state. The barrier follower blade 7 is interlocked with the barrier blade 5 by the barrier connecting member 6, so that the barrier follower blade 7 maintains a closed state similarly to the barrier blade 5.

Next, a case where the barrier shown in FIGS. 1, 2 and 3 is opened from the state where the barrier shown in FIGS. 4 and 5 is closed will be described.

When the lens barrel changes from the retracted state to the photographing state, first, the barrier driving member 1 separates from the barrier lever 2 and the barrier lever 2 is rotated by the urging force of the barrier opening spring 4. The barrier absorption spring 3 rotates integrally with the barrier lever 2 because one arm 3a is fixed by the projections 2a and 2c of the barrier lever 2. Since the barrier blade 5 is in contact with one of the arms 3a of the barrier absorption spring 3, it follows the barrier lever 2 and is opened. The barrier driven blade 7 is linked with the barrier blade 5 by the barrier connecting member 6, so that the barrier driven blade 7 is in an open state similarly to the barrier blade 5.

Next, a case will be described in which the barrier blade 5 is forcibly changed from the retracted state to the photographing state with the barrier blade 5 kept closed, and the absorbing mechanism of the barrier opening spring shown in FIG. 6 operates.

When the movable lens barrel changes from the retracted state to the photographing state, the barrier driving member 1 moves away from the barrier lever 2. Although the barrier lever 2 is urged by the barrier opening spring 4 in the direction in which the barrier blade 5 opens, the operation pin 5 of the barrier blade 5 is forcibly closed because the barrier blade 5 is forcibly closed.
a holds one arm 3a of the barrier absorption spring 3, the barrier lever 2 cannot rotate, and the barrier blade 5
The camera enters the shooting state with closed. The barrier follower blade 7 is interlocked with the barrier blade 5 by the barrier connecting member 6, so that the barrier follower blade 7 maintains a closed state similarly to the barrier blade 5.

When the force on the blade is released from this state, the barrier lever 2 is rotated by the barrier opening spring 4. The barrier absorption spring 3 rotates integrally with the barrier lever 2 because one arm 3a is fixed by the projections 2a and 2c of the barrier lever 2. The operating pin 5a of the barrier blade 5 is pushed by one arm 3a of the barrier absorption spring 3, and the barrier blade 5 rotates to open the barrier. The barrier driven blade 7 is linked with the barrier blade 5 by the barrier connecting member 6, so that the barrier driven blade 7 is in an open state similarly to the barrier blade 5.

When assembling the barrier lever 2 into the base member 8, the arm 4 a of the barrier opening spring 4 fixed to the base member 8 is hooked on the projection 2 d of the barrier lever 2. After assembling and assembling in this state, the protrusion 2d of the barrier lever is formed.
The arm 4a of the barrier opening spring from the arm. This allows
Since the barrier lever 2 and the barrier absorbing spring 3 have a fixed relationship from the beginning, the barrier lever 2, the barrier absorbing spring 3, and the barrier opening spring 4 can be handled as a unit.

When only one barrier blade is required and when the barrier blade 5 and the barrier driven blade 7 are directly linked, the barrier connecting member 6 becomes unnecessary, so that the space in the optical axis direction is further omitted.

As described above, according to this embodiment, the torsion spring having the center coaxial with the barrier lever is used for the barrier absorption spring and the barrier open spring in the absorption mechanism for opening and closing the barrier blade 5, so that the barrier blade can be opened and closed. There is no need for the rotation axis and the barrier lever rotation axis to be parallel.

Therefore, instead of arranging the barrier ring and the barrier absorbing spring (and the barrier opening spring) on top of the shutter unit and the taking lens as in the prior art, a unit including a barrier lever, a barrier absorbing spring and a barrier opening spring is used. The absorbing mechanism can be efficiently arranged in the empty space of the shutter unit, and the retracted length of the lens barrel is reduced, so that the camera can be downsized.

Further, a portion for locking the arm portion of the barrier opening spring is provided on the barrier lever, and the arm fixed to the base member of the barrier opening spring is locked to the barrier lever when the barrier opening spring is assembled. It can be handled as a unit with the barrier lever, barrier open spring, and barrier absorption spring attached without using a member such as a barrier base plate, and a barrier absorption mechanism with reduced cost and improved workability can be realized. .

(Correspondence between the Invention and the Embodiment) The moving barrel in the above-described embodiment is the lens barrel of the present invention, and the barrier blade 5 (the barrier blade 5 and the barrier driven blade 7) is the barrier member of the present invention. The barrier lever 2 corresponds to the barrier lever of the invention, the barrier opening spring 4 corresponds to the barrier opening spring of the invention, and the barrier absorption spring 3 corresponds to the barrier absorption spring of the invention.

[0053]

According to the first to sixth aspects of the present invention, the thickness of the mechanism constituted by the barrier lever, the barrier absorption spring and the barrier opening spring in the optical axis direction can be reduced. Since it is possible to efficiently arrange the shutter unit in an empty space of the shutter unit, the collapsible length of the lens barrel is reduced, and the camera can be downsized.

Further, a portion for locking the arm portion of the barrier opening spring is provided on the barrier lever, and the arm portion fixed to the base member of the barrier opening spring is locked to the barrier lever when the barrier opening spring is assembled. It can be handled as a unit with the barrier lever, barrier open spring, and barrier absorption spring attached without using a member such as a barrier base plate, and a barrier absorption mechanism with reduced cost and improved workability can be realized. .

[Brief description of the drawings]

FIG. 1 is a front view of a barrier opening / closing device according to a first embodiment, showing a state in which barrier blades are open.

FIG. 2 is a side view of FIG. 1;

FIG. 3 is a side view of the barrier lever of FIG. 1 as viewed from an axial direction.

FIG. 4 is a front view of the barrier opening / closing device according to the first embodiment, showing a state in which barrier blades are closed.

FIG. 5 is a side view of the barrier lever of FIG. 4 as viewed from the axial direction.

FIG. 6 is a side view of the barrier opening / closing device according to the first embodiment as viewed from the axial direction, in a state in which the barrier blade of the burr is closed and the state is changed from the collapsed state to the photographed state, and the absorbing mechanism of the barrier opening spring operates. Indicates a state in which

FIG. 7 is a side view of the barrier lever of the barrier opening / closing device according to the first embodiment as viewed from the axial direction. The barrier lever is opened, the state changes from the photographing state to the collapsed state, and the absorbing mechanism of the barrier absorbing spring operates. Indicates a state in which

FIG. 8 is a cross-sectional view of a conventional camera, showing a collapsed state.

FIG. 9 is a sectional view showing a WIDE end position of the camera in FIG. 8;

FIG. 10 is a front view of the barrier opening / closing device of the camera in FIG. 8;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Barrier drive member 2 ... Barrier lever 3 ... Barrier absorption spring 4 ... Barrier opening spring 5 ... Barrier connection member 7 ... Barrier driven blade 8 ... Base member 9 ... Lens barrel 10 ... Barrier cover

Claims (6)

[Claims] A barrier member that opens and closes a front surface of a lens barrel that moves along a direction of an optical axis between a retracted state and a photographing state; and a barrier member that opens and closes as the lens barrel moves. A barrier opening / closing device having a barrier driving mechanism for opening and closing, wherein the barrier driving mechanism has a rotation axis on a plane orthogonal to an optical axis, and is rotated in a barrier closing direction by a collapsing operation; A barrier opening spring that urges a lever in a direction in which the barrier member opens, and a barrier absorption spring that rotates integrally with the barrier lever and transmits an opening / closing operation to the barrier member, wherein the barrier absorption spring is A barrier opening / closing device, wherein the barrier member is pushed in a direction in which elastic deformation of the barrier absorbing spring can be absorbed by rotation of the barrier lever in a closing direction. 2. The barrier opening / closing device according to claim 1, wherein the barrier opening spring is coaxially mounted on the barrier lever. 3. The barrier opening / closing device according to claim 1, wherein the barrier absorbing spring is a torsion spring having a center coaxial with a rotation axis of the barrier lever. 4. The barrier lever according to claim 1, wherein the barrier lever has a projection for locking and holding one arm of the barrier opening spring when assembling the barrier opening spring. Barrier opening and closing device. 5. The barrier member according to claim 1, 2, 3, or 4, wherein the barrier member includes a barrier blade driven by the barrier absorption spring, and a plurality of barrier driven blades driven by the barrier blade. A barrier opening / closing device, characterized in that: 6. The barrier opening / closing device according to claim 1, provided on a lens barrel that moves between a collapsed state and a photographing state along an optical axis direction. A camera that covers the front surface of the lens barrel with the barrier member in a collapsed state, and moves the barrier member in an opening direction by a spring force of the barrier opening spring in a shooting state.