JPH0544816Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a focal plane shutter setting mechanism used in a camera.

[Prior art and its problems]

In a focal plane shutter, shooting ends when the leading blade moves to the position where the aperture is opened and the trailing blade moves to the position where the aperture is closed, and the leading blade completely closes the aperture by the shutter setting operation. The type in which the rear blade moves to the position where the aperture is closed after the rear blade moves to the position where the aperture is opened is disclosed in U.S. Pat. 75728
(No.).

A conventional example will be explained using drawings showing embodiments of the present invention.

Reference numeral 1 designates a rear blade driving member pivotally attached to a shaft 2, which forms arm portions 1a and 1b, supports a roller 1d on a support shaft 1c, and is also shown by the solid line arrow (the rear blade is moved to open the aperture). The actuation behavior is given in the direction (right rotation) of moving from the closed position to the closed position.

Reference numeral 3 designates a rear blade operating member pivotally attached to the shaft 2, in which a pin 3 supported by a support shaft 3b that engages with the arm portion 1a is installed, and when the rear blade drive member 1 rotates to the right, it integrally rotates to the right. The drive member 1 operates independently of the drive member 1 in the counterclockwise direction.

Reference numerals 4 and 5 denote a pair of rear blade support portions that are rotatably arranged by fitting into a pin 6 and a pin 7 that protrude from the back side of the shaft 2, respectively. The support member 4 located at
A hole 4a that is larger in diameter than the pin 3a is formed into which the pin 3a is fitted.

Although the rear blade is not shown, it is composed of five blades, and each blade is attached to the rear blade support members 4 and 5 by 4A-5A and 4B, respectively.
It is supported by two points each: -5B, 4C-5C, 4D-5D, and 4E-5E.

Other constituent members will be described later.

The illustrated state shows the completion of the set operation.

Conventionally, in order to move the rear blade from a position where the aperture is closed to a position where the aperture is opened, the rear blade operating member 3 has been given an operating habit in the direction indicated by the chain double-dashed line (left rotation).

In addition, in order to ensure that the position where the rear blade opens the aperture is always constant, the rear blade support member 5 of the pair is given an operating habit in the direction indicated by the chain double-dashed line (clockwise rotation), and The elastic member X was placed immediately before the left rotation limiting position of the member 5 as shown by the two-dot chain line.

Therefore, the forces of the left-handed rotational force of the rear blade operating member 3 and the right-handed rotational force of the rear blade support portion 5 or the elastic restoring force of the elastic member X become a spring balance, and the force of the left-handed rotation of the rear blade operating member 3 becomes a spring balance. I had to set the left rotation action force stronger than necessary. This is because if the difference between the two forces is small, the fixed position of the rear blade will not be stable.

Also, since the directions of the respective forces are different, there is a gap on the right side of the pin 3a (on the opposite side ), and in order to move the rear blade from the position where the aperture is opened to the position where the aperture is closed, the rear blade driving member 1 pushes the pin 3a with the right-handed rotating arm 1a to move the rear blade operating member 3. When the pin 3a and the hole 4a are rotated to the right, a collision occurs because there is a gap on the right side of the pin 3a and the hole 4a.
The movement of the trailing blades was disturbed, which was undesirable.

[Purpose of the invention] The present invention provides an operational sliding force for moving the rear blade from a position where the aperture is closed to a position where the rear blade opens the aperture, and a focal plane shutter for a camera as described above. It is an object of the present invention to provide a setting mechanism in which a single force source (spring) is used to provide an operating sliding force for keeping an aperture at a constant position at all times.

[Summary of the idea]

The purpose of this invention is to complete the shooting with the leading blade moved to the position where the aperture is opened and the trailing blade moved to the position where the aperture is closed, and then the leading blade completely closes the aperture by the shutter setting operation. In a blade-type focal plane shutter in which the rear blade moves to a position where the aperture is opened after the rear blade moves to the closing position, the rear blade of the pair is located on the side where the rear blade closes the aperture. Only the blade support member is provided with a spring that gives a displacement habit to move the rear blade to a position where the aperture is opened, and the rear blade support member on the side that opens the aperture is given a habit in the aperture opening direction via the rear blade. , when the rear blade supporting member is operated by the rear blade driving member by removing a gap between the rear blade operating member biased in the closing direction by the driving member that drives the rear blade and the rear blade supporting member on the open side; This is achieved by a set mechanism designed to eliminate delays.

By configuring as described above, in order to eliminate the delay in the operation of the rear blade support member by the rear blade drive member in the prior art, the rear blade support member on the open side is given a left-turning tendency, and the rear blade support member on the closed side is rotated to the left. Whereas two springs were required to give the trailing blade support member a right-handed rotation tendency, the present invention provides only one spring to eliminate the delay in actuation of the trailing blade support member. Excellent effects can be obtained.

[Example of idea]

Embodiments of the present invention will be described below based on the drawings.

Note that the portions described in relation to the conventional example will be omitted, and only undescribed portions will be described.

Reference numeral 8 denotes a rear locking member pivotally attached to the shaft 9, which has a bent portion 8a that locks the arm portion 1b of the rear blade drive member 1.
and a bend 8b that is pushed by a closing signal member (not shown), giving an operating habit in the direction indicated by the solid line arrow (right rotation).

10 is a rear connection release member pivotally connected to the shaft 11;
A slope 10a that is pushed by the pin 3a of the rear blade operating member 3, and a hook 10b that locks the pin 3a.
and a bend 10c, giving an operating habit in the direction indicated by the solid line arrow (right rotation).

12 is a leading blade driving member pivotally connected to the shaft 13;
A pin 12a is installed, and a roller 12c is supported on a support shaft 12b.

Note that a pair of leading blade supporting members (one of which receives the fitting of the pin 12a) driven by the pin 12a and the leading blade (a plurality of blades) supported by the supporting member are omitted.

Reference numeral 14 denotes a tip locking member pivotally attached to the shaft 15, and a bent portion 14a that locks the tip blade drive member 12;
A bend 14b is formed which is pushed by a release signal member (not shown), and an operating habit is given in the direction indicated by the solid line arrow (left rotation).

Reference numeral 16 denotes a main setting member pivotally connected to a shaft 17, on which support shafts 16a and 16b are installed, and a roller 16c that can push the roller 1d of the rear blade drive member 1 is supported on the support shaft 16a. At the same time, a protrusion 16d is formed that can push the bent portion 10c of the rear connection release member 10, and an operating habit is provided in the direction indicated by the solid line arrow (left rotation).

Reference numeral 18 denotes a sub-set member pivotally connected to the shaft 19, on which support shafts 18a and 18b are installed, and a roller 18c capable of pushing the roller 12c of the leading blade driving member 12 is supported on the support shaft 18a. There is.

A connecting member 20 is supported by a support shaft 16b of the main setting member 16 and a support shaft 18b of the sub-setting member 18.

Reference numeral 21 denotes a spring that is a feature of the present invention, and includes a winding intermediate portion fitted into the pin 7, a pin 22 at both ends implanted in a substrate to be described later, and a rear blade located on the side where the rear blade closes the aperture. It is hooked into a hole 5 formed in the support member 5, giving the support member 5 a left-handed rotation behavior (a direction in which the trailing blade is moved to a position where the aperture is opened).

The above members are divided into those located on the front side and the back side of the board (not shown), and members 1, 3, 8, 10, 12, 14, 16, 18 and 20 are located on the front side, and members 1, 3, 8, 10, 12, 14, 16, 18 and 20 are located on the back side. At this point, members 4, 5, rear blades (not shown), 6, 7, a pair of leading blade support members (not shown), and a leading blade are located. and,
The pin 3a of the trailing blade operating member 3 and the pin 12a of the leading blade driving member 12 protrude to the back side thereof through long holes formed in the substrate, and the trailing blade supporting member 4 and
It is fitted and connected to one of the leading blade support members.

Further, in the embodiment of the present invention, there is no right-handed movement or elastic member X shown by the two-dot chain line with respect to the rear blade operating member 5 as described above.

The illustrated state is after the shutter has been set.

What should be noted here is that the only spring 21
Since the rear blade support member 5 is given a left-handed rotation behavior in the direction of opening the rear blade, the rear blade support member 4 similarly operates in the direction of opening the rear blade via the rear blade (blade group). Therefore, the pin 3a of the rear blade operating member 3 (abuts against the arm portion 1a of the rear blade driving member 1 and restricts the left rotation position) against the right inner surface of the hole 4a.
As a result, the position at which the rear blade opens the aperture is regulated to a fixed position due to its habit.

Therefore, when the shutter is released, the release signal member rotates the leading locking member 14 to the right against the operating habit, and releases the locking of the leading blade driving member 12 caused by the bend 14a.

As a result, the leading vane drive member 12 rotates to the right due to its operating behavior, moving the leading vane from the aperture closed position to the aperture open position.

Next, after a predetermined time interval, the rear locking member 8 is rotated to the left against the operating habit by the closing signal member, and the locking of the arm portion 1b by the bending 8a is released.

As a result, the rear blade driving member 1 rotates to the right due to its operating habit, and since the arm portion 1a engages with the pin 3a, the rear blade operating member 3 also rotates to the right. Therefore, since the rear blade support members 4 and 5 (via the rear blades) are engaged with the pin 3a on the right inner surface of the hole 4a,
The spring 21 immediately responds to the right rotation without any delay.
The rear blade is rotated to the right against the tension of the aperture, moving the rear vane from the aperture opening position to the aperture closing position.

In the final region of this clockwise rotation operation, the pin 3a pushes the slope 10a and rotates the rear connection release member 10 to the left against the operating habit, and after the pin 3a overcomes the slope 10a, As a result of the clockwise return operation, it is locked to the hook 10b.

With the above operations, one shooting session is completed.

Next, when the main setting member 16 is rotated to the right against the operating habit due to the shutter setting operation, the roller 16c engages with the roller 1d and the rear blade drive member 1 is rotated to the left against the operating habit. 1b
After pressing the bend 8a of the rear locking member 8 with the upper slope and turning it to the left, the arm portion 1b is bent over the rear locking member 8 by climbing over the bend 8a and returning the rear locking member 8 to the right. 8a. On the other hand, as the main setting member 16 rotates to the right, the sub-setting member 18 is also rotated to the right via the connecting member 20, so that the roller 18c engages with the roller 12c and causes the leading blade drive member 12 to rotate to the left against the operating habit. Then, after the arm portion supporting the pin 12a of the leading blade driving member passes over the bend 14a of the leading blade driving member 14, the leading blade driving member 1
The leading blade driving member 12 is locked by the bend 14a at No. 4. Therefore, the leading vane is moved from the aperture open position to the aperture closed position and locked. Also, at the timing after the leading blade moves, the protrusion 16 of the main setting member 16
d pushes the bending part 10c to release the rear connection release member 10.
The hook 10b is removed from the pin 3a by rotating it to the left against the operating habit. As a result, the rear blade operating member 3 and the rear blade support members 4 and 5 are rotated to the left by the force of the spring 21, returning to the illustrated state and moving the rear blade from the aperture closed position to the aperture open position. .

Then, the setting operation is canceled and the setting member system returns to the state shown in the figure, thereby completing the setting operation.

[Effect of idea]

As described above, the focal plane shutter setting mechanism of the present invention has the function of moving the rear blade from the aperture closed position to the aperture open position by the actuation behavior of one spring applied to the rear blade support member. At this open position, the right side of the hole of the rear blade habit member is engaged with the right side of the pin of the rear blade operating member that is locked by the rear locking member, so that the rear blade opening position of the rear blade habit member is accurately set. This simplifies the configuration because the function of regulating the position of the rear blade in which the aperture is opened can be controlled to a constant value. In the shutter set state, the rear blade drive system and the rear blade support system are in continuous engagement and connection in the closing operation direction, so that the closing driving force is immediately transmitted to the rear blade when the shutter is operated. , there is no disturbance in the closing operation of the trailing blade.

[Brief explanation of the drawing]

The drawing is an explanatory diagram showing an embodiment of the present invention in a set state. DESCRIPTION OF SYMBOLS 1... Rear blade drive member, 3... Rear blade operation member, 4, 5... Rear blade support member, 5a... Hole, 1
0... Trailing blade connection release member, 12... Leading blade driving member, 16... Main setting member, 18... Sub-setting member, 20... Connection member, 21... Spring, 22...
…pin.

Claims (1)

[Claims for Utility Model Registration] A leading blade; a pair of leading blade supporting members that are interlocked with each other via the leading blade to support the leading blade; and a pair of leading blade supporting members that are arranged in a closed position and an open position of the leading blade. a leading blade driving member 12 for driving between positions; a trailing blade; a pair of trailing blade support members 4 and 5 that are interlocked with each other via the trailing blade for supporting the trailing blade; The inner rear blade is connected to a rear blade support member 4 located on the side that opens the aperture,
a rear blade operating member 3 rotatable together with the rear blade support member between an open position and a closed position of the rear blade; and a rear blade operating member 3 that is driven between the open position and the closed position of the rear blade. In order to move the rear blade to a position where the aperture is closed, the rear blade is driven to move integrally with the rear blade operating member, and in a direction where the rear blade is moved to a position where the aperture is opened. includes a rear blade driving member 1 which is configured to move independently of the rear blade operating member, and which locks the rear blade drive member in the rear blade open position and locks the rear blade drive member after a predetermined period of time when the shutter is operated. a rear blade locking member 8 configured to release the rear blade, a rear connection release member 10 configured to lock the trailing blade operating member in the trailing blade closed position, and a trailing blade locking member 10 configured to lock the leading blade driving member in the leading blade closed position. , a leading blade locking member 14 that releases the lock by shutter release, and a roller 16c that operates the roller 1d of the trailing blade driving member, the leading blade moves to a position where the aperture is opened, and the trailing blade a main setting member 16 that is activated by a setting operation of the shutter after photographing is completed in a state where the shutter has moved to a position where the rear blade is closed, and the rear blade driving member is configured to move the roller of the main setting member. is moved to a position corresponding to the trailing blade open position by actuating a roller of the trailing blade driving member and is locked by the trailing blade locking member, and the leading blade driving member is moved to the leading blade closing position. and is locked by the leading blade locking member, and the main setting member has its protrusion 16d actuating the bending 10c of the rear connection releasing member to release the locking of the trailing blade operating member, and A focal plane that is locked to a trailing blade drive member and held in a trailing blade open position so that the leading blade moves to an aperture closing position and the leading blade moves to an aperture closing position. In the shutter, only the rear blade support member of the pair located on the side where the rear blade closes the aperture is provided with a displacement habit to move the rear blade to a position where the aperture is opened. It has a spring 21, and the spring is held at a position corresponding to the rear blade opening position by giving a behavior in the aperture opening direction to the rear blade support member on the side that opens the aperture via the rear blade. removing a gap on the trailing blade closing side between the engaging portion of the trailing blade operating member, which is locked in the trailing blade open position by the trailing blade driving member located in the rear blade opening position, and the trailing blade supporting member on the open side, and completing the photographing. A function for later driving the rear blade operating member in the rear blade closing direction by suppressing a delay when the rear blade driving member is operated in the rear blade closing direction, and a function for moving the rear blade from the aperture closed position to the aperture closing position. A focal plane shutter setting mechanism characterized by having the function of moving the focal plane shutter to an open position.