JPH063377Y2 - Shutter for camera - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a camera shutter, and more particularly to a camera shutter in which a charge mechanism-related portion is devised.

<Prior Art and Problems Thereof> Generally, when charging a camera shutter for an exposure operation, it is necessary to make the charging completion position of the shutter and the operation completion position of the charging mechanism the same in view of manufacturing errors and the like. Practically impossible. For this reason, it is customary to provide the shutter mechanism and the charging mechanism with an overcharge region that can be operated even after completion of charging.

However, if the overcharge area of the shutter is enlarged as it is, the operation range of the shutter blade as a whole is enlarged, and the shutter mechanism is enlarged. for that reason,
Various overcharge absorption mechanisms for absorbing the overcharge amount of the shutter blades have been proposed, but most of them have a relatively complicated structure or increase the weight of the blade operating member. , Small shutter
It was an obstacle to speeding up.

On the other hand, in recent years, for the purpose of simplifying the mechanism and stabilizing the shutter speed operation, an iron piece that is an arture is directly provided on the operating lever of the shutter blade, and this iron piece is attracted and released by an electromagnet to charge the shutter blade. It has been proposed to maintain the position and control the start timing of the shutter blades. This eliminates the need for the charge position holding member of the operating lever and the iron piece lever for the iron piece, but requires an overcharge absorbing mechanism for the iron piece, and this requires a device. Further, in order to improve the attraction reliability of the electromagnet, it is desirable that the iron piece has a degree of freedom and is pressed by the spring toward the attraction surface, but this requires a separate spring.

<Purpose of Invention> The present invention has been made in view of the above points, and an object thereof is to provide an iron piece as an armature on the operating lever of the shutter blade described above, and to adsorb and release the iron piece with an electromagnet. An object of the present invention is to provide a camera shutter that is controlled so that the overcharge absorption mechanism at the time of charging operation can be simplified as a whole and the attraction reliability between the electromagnet and the iron piece can be guaranteed.

<Means for Solving the Problems> The above-mentioned object of the present invention is to provide an operating lever that is operable between a charge position and a stop position for shutter exposure operation and provided with a locking projection, and the operating lever. An armature made of a supported magnetic body and attached to the actuating lever with a certain degree of freedom in the attracting surface direction and the swinging direction, and one arm supported by the fixed part and the other arm bent. The base side is elastically contacted with the locking projection and the tip side is elastically contacted directly with the rear end of the armature, and the spring for urging the operating lever from the charge position to the stop position and the armature are attracted. An electromagnetic device for holding the operating lever in the charging position against the spring, and a charge for moving the operating lever from the stop position to the charging position. A shutter for a camera, wherein the spring presses the attraction surface of the armature toward the attraction surface of the electromagnetic device when the charge member moves to the charging position of the actuating lever. It

<Operation> As described above, when the one arm is supported by the fixed portion and the other arm is supported by the armature to urge the operating lever from the charge position to the stop position, the overcharge amount of the charge member is expressed in other words. If so, the overcharge amount of the shutter blades that interlock with the actuating lever can be absorbed by the bending of the spring, and the other arm of the spring has a predetermined degree of freedom with respect to the actuating lever. Since it is directly pressed, the adsorption surface of the iron piece can be adsorbed to the adsorption surface of the electromagnet with good adhesion, and the deflection of the spring described above can also constitute an iron piece overcharge absorption mechanism.

<Embodiment> The present invention will be described below with reference to an illustrated embodiment. 1 to 4 relate to an embodiment of the present invention, in which FIG. 1 is a plan view of relevant parts showing a state after completion of exposure and before charging, and FIG. 2 is a plan view of relevant parts in a completed charging state. FIG. 4 is a plan view of relevant parts in an overcharged state, and FIG. 4 is a plan view of relevant parts showing a state before exposure is started.

In the figure, reference numeral 1 is a main plate of a shutter mechanism, and a photographing opening 1
a, arc-shaped guide grooves 1b, 1c, etc. are provided, and locking projections 1d, 1e and guide projections 1f, 1g are provided in a protruding manner.

2 is an opening lever (actuating lever) which is pivotally supported by the base plate 3
A locking projection 2a and an iron piece holding portion 2b, which will be described later, are provided on the upper surface of the opening lever 2, and a drive projection 2c is provided on the lower surface of the tip of the opening lever 2.
The drive protrusion 2c is adapted to be inserted into the guide groove 1b and protrude toward the back surface side of the main plate 1 in the drawing so as to drive an open blade (front blade) (not shown). It is rotatable within the range permitted by 1b.

Reference numeral 4 denotes an iron piece member that is an armature that cooperates with an electromagnet 6 described below, and is attached to the holding portion 2b of the opening lever 2 with a predetermined degree of freedom. That is, the iron piece member 4 has the suction portion 4a, the neck portion 4b, and the retaining portion 4c, can slide a predetermined amount with respect to the holding portion 2b, and can be connected to the suction portion 4a and the neck portion 4b and the holding portion 2b. A slight amount of rocking can be caused by the backlash.

Reference numeral 5 denotes a spring whose winding portion is held by the boss portion 2d of the opening lever 2, and which has one arm 5a formed in a straight line and the other end 5b whose tip is bent and formed in a substantially V shape. The one arm 5a is elastically contacted with the locking projection 1d of the base plate 1. Further, the other arm 5b has its tip end side elastically contacted with the rear end retaining portion 4c of the iron piece member 4 on the release lever 2, and its root portion is the locking projection 2 of the release lever 2.
It is hit by a. As a result, the spring 5 imparts the right-handed turning property to the opening lever 2, and in the first illustrated state, the opening lever 2 is brought to the right-hand turning limit position by the spring 5, and the opening lever 2 The above-mentioned opening blade (not shown) interlocking with 2 is at the opening position of the photographing opening 1a.

Reference numeral 6 denotes an electric attraction type electromagnet capable of attracting the iron piece member 4 so that the attraction portion 6a of the iron piece member 4 faces and closely contacts the attraction surface 6a thereof by the left rotation of the opening lever 2 described later. .

Reference numeral 7 is a closing lever (actuating lever) which is pivotally supported by the main plate 1 and has an engaging projection 7a and a holding portion 7b of an iron piece, which will be described later, provided on the upper surface of the closing lever 7 and is closed. A drive projection 7c is provided on the lower surface of the tip of the lever 7. The drive projection 7c is inserted into the guide groove 1c and protrudes toward the back surface of the main plate 1 in the drawing to drive a closing blade (rear blade) (not shown). It is rotatable within the range permitted by 1c.

Reference numeral 9 is an iron piece member that is an armature that cooperates with an electromagnet 11 described later, and is attached to the holding portion 7b of the closing lever 7 with a predetermined degree of freedom. That is, like the iron piece member 4, the iron piece member 9 also has the suction portion 9a, the neck portion 9b, and the retaining portion 9c, which can slide with respect to the holding portion 7b by a predetermined amount, and the suction portion 9a and the neck portion. A slight amount of swing can be caused by the play between the portion 9b and the holding portion 9b.

Reference numeral 10 denotes a spring, the winding portion of which is held by the boss portion 7d of the closing lever 7, and the one arm 10a linearly formed,
The other end 10b has a tip bent and formed into a substantially V shape, and the one arm 10a is elastically contacted with the locking projection 1e of the base plate 1. Further, the other arm 10b has its tip end side elastically contacted with the rear end retaining portion 9c of the iron piece member 9 on the opening lever 7 and its root part elastically contact with the locking projection 7a of the closing lever 7. Has been done. As a result, this spring 1
0 indicates that the closing lever 7 has a right-handed turning characteristic in the drawing, and the first
In the illustrated state, the closing lever 7 is brought to the right-hand rotation limit position by the spring 10, and the above-mentioned closing blade (not shown) interlocking with the closing lever 7 is in the position where the photographing opening 1a is closed.

Reference numeral 11 denotes an electric attraction type electromagnet capable of attracting the iron piece member 9, and the attraction portion 11a of the iron piece member 9 is opposed to and in close contact with the attraction surface 11a thereof by the left rotation of the closing lever 7 described later. .

A charging member 12 is installed so that its long grooves 12a and 12b are guided by the guide protrusions 1f and 1g of the main plate 1 and slidable in the vertical direction in the figure by a predetermined amount. The eccentricity is imparted, and it is in the lower limit position in the state shown in FIG. 12
c and 12d are drive protrusions, which are the charge members 1 respectively.
2, the former drive projection 12c can press the other arm 5b of the spring 5, and the latter drive projection 12d can press the other arm 10b of the spring 10.

Next, the operation based on the above configuration will be described. Now, when the charge member 12 is moved upward by appropriately receiving a driving force from the state shown in the first illustration, the driving projection 12c first presses the other arm 5b of the spring 5, and this pressing force is applied via the iron piece member 4. Acting on the opening lever 2 to rotate the opening lever 2 counterclockwise while charging the spring 5. Due to the subsequent upward movement of the charging member 12, the other driving projection 12d is moved to the spring 1
0 starts to press the other arm 10b, and similarly, this pressing force acts on the closing lever 7 via the iron piece member 9, and the closing lever 7 also moves to the left arm while charging the spring 10.

Due to the upward movement of the charging member 12, the opening lever 2
First reaches the left-hand rotation limit position, and the adsorption portion 4 of the iron piece member 4 is reached.
a is in close contact with the attraction surface 6a of the electromagnet 6. At this time, as described above, the iron piece member 4 is held on the opening lever 2 with a predetermined degree of freedom, and the iron piece member 4 is directly pressed by the other arm 5b of the spring 5, The attracting portion 4a of the iron piece member 4 closely contacts the attracting surface 6a. The subsequent upward movement of the charging member 12 is absorbed by the bending of the other arm 5b itself caused by the root portion of the other arm 5b being separated from the locking projection 2a.

Then, by the subsequent upward movement of the charging member 12,
Similarly, the closing lever 7 is at the left-hand rotation limit position, and the attraction portion 9a of the iron piece member 9 is also in good contact with the attraction surface 11a of the electromagnet 11. After that, when the charging member 12 further moves into an overcharged state, the root portion of the other arm 10b of the spring 10 for the closing lever 7 also separates from the locking projection 7a, and the overhang is caused by the bending of the other arm 10b itself. It is designed to absorb charges. Third
The figure shows this overcharge state, in which the spring 5 or the spring 10 simplifies the overcharge absorbing mechanism for the opening lever 2 and the iron piece member 4, or for the closing lever 7 and the iron piece member 9, respectively. It will be apparent from the drawing that it is surely formed.

When the driving force applied to the charging member 12 is removed from the state shown in the third drawing, the charging member 12 returns slightly downward by the return spring 13 and is held by a known locking mechanism (not shown). The charging is completed. At this time, the opening blade (not shown) that interlocks with the opening lever 2 has been brought to a position that closes the photographing opening 1a, and the closing blade (not shown) that interlocks with the closing lever 7 has the photographing opening 1a. It is brought to the position where 1a is opened.

When a release operation is performed from the state shown in FIG. 2, first, a power switch is turned on to energize / excite both electromagnets 6 and 11, and thus both iron piece members 4 and 9 (that is, release lever 2).
And the closing lever 7) is adsorbed and held. Then, the lock of the charging member 12 is released, and the charging member 12 is rapidly moved downward by the return spring 13 to shift to the state shown in FIG. From this state, the electromagnet 6 is demagnetized, and the opening lever 2 is rapidly rotated right by the force of the charged spring 5 to move the open blade from the closed position to the open position. At a later appropriate time timing, the other electromagnet 11 is demagnetized, and the closing lever 7 is rapidly rotated to the right by the similarly charged spring 10 to shift the closing blade from the open position to the closed position. Then, when the photographing for one time is completed, all the members return to the states shown in the first figure, and the next charging operation is reached.

In the above-mentioned embodiment, the electromagnets 6 and 11 are
Is an electric attraction type, it is also possible to use a so-called electromagnet releasing type using a permanent magnet. In this case, the charging completion / imaging standby state is the state shown in FIG. Further, the charging member 12 does not directly press the above-mentioned springs 5 and 10, and as shown in FIG.
The second drive protrusion 12c may press the side of the opening lever 12, and various modifications are conceivable without departing from the spirit of the present invention.

<Effect> As described above, according to the present invention, an iron piece serving as an armature is provided on the operating lever of the shutter blade, and the iron piece is attracted and released by an electromagnet. The overcharge absorption mechanism can be simplified as a whole, and a product which can guarantee the adsorption reliability between the electromagnet and the iron piece can be provided, and its practical value is great.

[Brief description of drawings]

1 to 4 relate to an embodiment of the present invention, in which FIG. 1 is a plan view of relevant parts showing a state after completion of exposure and before charging, and FIG. 2 is a plan view of relevant parts in a completed charging state. FIG. 4 is a plan view of a main part in an overcharged state, FIG. 4 is a plan view of a main part before the start of exposure, and FIG. 5 is a plan view of a main part according to another embodiment of the present invention. In the figure, 1 is a base plate, 1a is a photographing opening, 1b and 1c are guide grooves, 1d and 1e are locking projections, 1f and 1g are guide projections,
2 is a release lever (operation lever), 2a is a locking protrusion, and 2b
Is a holding part, 2c is a drive protrusion, 3 is a shaft, 4 is an iron piece member (armature), 4a is a suction part, 4b is a neck part, 4c is a retaining part, 5 is a spring, 5a is one arm of the spring 5, 5b. Is spring 5
The other arm, 6 is an electromagnet, 6a is an attraction surface, 7 is a closing lever (operating lever), 7a is a locking projection, 7b is a holding portion, 7c.
Is a drive protrusion, 8 is a shaft, 9 is an iron piece member (armature),
Reference numeral 9a is an adsorption portion, 9b is a neck portion, 9c is a retaining portion, 10 is a spring, 10a is one arm of the spring 10, 10b is the other arm of the spring 10, 11 is an electromagnet, and 11a is an adsorption surface.

Claims (2)

[Scope of utility model registration request] 1. An operating lever, which is operable between a charge position and a stop position for a shutter exposing operation and provided with a locking projection, and an armature made of a magnetic material supported by the operating lever. The one attached to the fixed part in the suction surface direction and the swinging direction with one arm supported by the fixed part, the other arm bent and the base side elastically contacted with the locking projection. The tip side is directly elastically contacted with the rear end of the armature, and a spring for urging the operating lever from the charging position to the stopping position, and the operating lever against the spring by adsorbing the armature. An electromagnetic device for holding the charging position, and a charging member for moving the operating lever from the stop position to the charging position. Upon transition to the charged position of the lever, said spring camera shutter, characterized in that it acts to push the suction surface of the armature to the suction surface direction of the electromagnetic device. 2. The utility model registration claim 1 characterized in that the other arm of the spring is directly engaged with the charge member to move the operating lever from the stop position to the charge position. The camera shutter described.