JPS6239372Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mechanism for preventing malfunction of the shutter of a retractable camera, and more particularly, to a mechanism for preventing malfunction of the shutter of a retractable camera equipped with an electromagnetic release shutter.

In an electromagnetic release shutter, for example, when the shutter is set, the shutter blade is locked in its starting position by the excitation action of a permanent magnet, but when the magnetic force of the permanent magnet disappears due to reverse excitation in conjunction with the pressing of the shutter button, the shutter blade locks. is released and opens. Therefore, this electromagnetic release type shutter is more susceptible to impact than a mechanical release type.

In addition, with retractable cameras, the lens barrel including the shutter mechanism is stored inside the camera body when not in use, and the lens barrel is pulled out to take pictures when in use, so there is no impact when the lens barrel is retracted. Easy to occur. Furthermore, since collapsible cameras are compact when the lens barrel is stored, they are generally handled easily and are often subject to external shocks.

Therefore, in a retractable camera equipped with an electromagnetic release shutter, there is a risk that the shutter blade may be inadvertently disengaged due to these impacts, causing the shutter to malfunction.

The present invention has been developed in view of the above-mentioned problems, and provides a shutter malfunction prevention mechanism for a collapsible camera that prevents the shutter blade from inadvertently operating even if an impact is applied during the collapsing state or during the collapsing operation. The purpose is to

The purpose of the present invention is to provide a safety lever member that prevents the shutter from being released when the lens barrel is retracted, but cannot prevent the shutter from being released when the lens barrel is pulled out. achieved by.

The present invention will be explained below based on an embodiment shown in the drawings.

First, FIG. 1 is a plan view showing the shutter mechanism housed in the camera body in the set state. , the shutter holding plate 30 is guided by a member 31 on the camera body side and is movable in a direction perpendicular to the plane of the drawing. Note that the member 31 shown in cross section has a relief portion 31a (FIG. 2) formed therein. However, the member 31 shown in FIGS. 1 and 2 (FIGS. 3 and 4)
The cutting locations in Figure) are different.

Next, in the figure, 1 is a substrate, an exposure opening 1a,
It has slots 1b and 1c, and is fixed to the shutter holding plate 30 with screws 32 or the like. 2
is a plurality of shutter blades, which are pivotally attached to the back side of the substrate 1 by well-known means. 3 is an opening magnet, which includes a permanent magnetic iron core 3a and a coil 3b.
and is fixed to the substrate 1. Reference numeral 4 denotes an open iron piece lever, which has an iron piece 4a and a pin 4b which are pivotally attached at the tip by a dowel 4c, and is pivotally supported on the base plate 1, and is biased by a spring 11 with a right-handed turning force. However, this is suppressed by the iron piece 4a being attracted to the iron core 3a. Reference numeral 5 denotes an opening locking lever, which has an arm portion 5a and a hook portion 5b, is supported on the base plate 1 coaxially with the opening lever 4, and is given left-handed rotation by a spring 6. However, it is restrained by coming into contact with a half-moon pin 7a, which will be described later. A sector ring 7 has a half-moon pin 7a and a pin 7b passing through the slot 1b, is arranged rotatably about the center point of the exposed opening 1a on the back side of the substrate 1, and is supported by a spring. 8 exerts a right turning force, but the crescent pin 7a abuts against the hook portion 5b and is restrained. Incidentally, the sector ring 7 is connected to the shutter blade 2 by a pin and slot (not shown) through well-known means.

35 is a safety lever, which has an arm portion 35a and a protrusion 35b.
It is slidably guided by the substrate 1, and is given a tendency to move leftward by the spring 36, but the protrusion 35b comes into contact with the dowel 4c and is restrained. In addition, in this state, the arm portion 35
The tip end surface of a is in contact with or very close to the side surface of the member 31 on the camera body side. Therefore, even if an impact is applied to the camera in this state and the opening iron lever 4 attempts to turn to the right, the safety lever 35 will prevent this.

Reference numeral 9 denotes a set plate, which has bent portions 9a and 9b, is guided on the base plate 1 so as to be movable up and down, and has a spring 1.
0, the bent portion 9a is applied to the hook portion 1 of the locking lever 12, which will be described later.
2a and is restrained. Reference numeral 12 denotes a locking lever, which has a hook portion 12a and an arm portion 12b, is pivotally supported on the base plate 1, and is given right-handed rotation by a spring 13, but is restrained by coming into contact with a stopper. ing. 14 is a closing magnet, iron core 1
4a and a coil 14b, which are fixed to the substrate 1. 15 is a closing iron lever; iron piece 15
a and a bent portion 15b, and is pivotally supported by the substrate 1. 17 is an interlocking lever, and bending portions 17a, 17
b, is coaxially supported on the base plate 1 with the closing iron lever 15, and is given a left-handed rotation by a spring 18, but the bent portion 17a is connected to the closing iron lever 15 (the iron piece 15a is in contact with the iron core 14a, and left rotation is inhibited.) Bent part 1
5b and is restrained. 16 is a spring.

Next, the operation of the above configuration will be explained.

First, when the lens barrel is pulled out from the camera body prior to the photographing operation, the shutter mechanism rises perpendicularly to the plane of the paper, and when the pullout is completed, the arm 35a of the safety lever 35 touches the relief part 31 of the member 31.
Come to a position opposite to a. (Figure 2). If the shutter button is pressed in this state, the coil 3b is energized and the permanent magnet iron core 3a is demagnetized by reverse excitation. Then, the open iron lever 4 released its restraint.
is rotated to the right by the action of the spring 11, whereby the dowel portion 4b' of the pin 4b pushes the arm portion 5a, causing the opening locking lever 5 to rotate to the right against the action of the spring 6. By turning the opening locking lever 5 to the right, the inhibition of the half-moon pin 7a by the hook portion 5b is released, and the sector ring 7
is rotated to the right by the spring 8 to open the shutter blade 2 (Fig. 3). On the other hand, the safety lever 35 slides to the right against the spring 36 in conjunction with this clockwise rotation of the open iron lever 4, and the arm portion 35a moves toward the relief portion 31.
Enter a (Figure 3).

In addition, when the sector ring 7 rotates to the right, the pin 7b pushes the bent portion 17b to rotate the interlocking lever 17 to the right. However, the closing iron lever 15 is restrained by the iron piece 15a being attracted to the iron core 14a (the coil 14b is energized and excited in response to the pressing of the shutter button), so the spring 16 is charged and a right-turning force is applied to the closing iron lever 15 (FIG. 3).

After that, when the proper exposure time has elapsed, coil 1
4b is de-energized, the iron core 14a is demagnetized, and the closed iron lever 15, which is released from restraint, is rotated to the right by the spring 16. Then, due to this right rotation, the bent portion 15
b pushes the arm 12b and the locking lever 12 is released by the spring 1.
Rotate to the left against 3. Then, the hook part 12a
The engagement between the bent portion 9a is released and the set plate 9 is moved upward by the spring 10, and the bent portion 9a pushes the half-moon pin 7a to rotate the sector ring 7 to the left.
Due to this left rotation, the shutter blade 2 is exposed through the opening 1a.
The exposure operation ends when the On the other hand, the set plate 9
As a result of the upward movement, the opening lever 4 is rotated to the left via the bent portion 9b, the spring 11, and the pin 4b,
The iron piece 4a is pressed against and attracted to the iron core 3a made of a permanent magnet. At the same time, the opening locking lever 5 is rotated to the left by the spring 6, so that the hook portion 5b enters the movement locus of the half-moon pin 7a, and the safety lever 35 is slid to the left by the action of the spring 36, and the arm portion 35a
escapes from the relief portion 31a of the member 31 on the camera body side. Further, as the sector ring 7 rotates to the left, the pin 7b pushes the spring 8 to put it in a charged state. The state up to this point is shown in FIG.

Then, as the pin 7b moves in the direction that pushes the spring 8, the interlocking lever 17, which is released from its restraint, rotates to the left together with the closed iron lever 15 by the action of the spring 18 (FIG. 1).

Thereafter, when the camera's film winding lever is operated, the set plate 9 is pushed back downwards, the spring 10 is placed in the charged state, and the locking lever 12 is moved again.
(Figure 1). Further, the downward movement of the set plate 9 causes the spring 11 to be in a charged state, and a right turning force is applied to the opening iron lever 4, but this is suppressed because the iron piece 4a is held by the iron core 3a (FIG. 1).

The lens barrel may be housed in the camera body either in the above-mentioned set state or in the non-set state as shown in FIG.

As is clear from the above, the lens barrel is stored in the camera body (Fig. 1), or just before the storage is completed or immediately after the storage starts (the safety lever 35
and member 31 are the same as in the state shown in FIG. This prevents the shutter from being released inadvertently.

The above is a description of one embodiment of the shutter malfunction prevention mechanism according to the present invention, but it goes without saying that the present invention is not limited to this embodiment.

For example, the safety lever 35 is biased in the direction toward the member 31, and the bottom surface of the relief portion 31a is gradually inclined in a cam shape in a direction perpendicular to the plane of the paper, and the safety lever 35 is pushed back by this cam surface. It is possible in any way. That is, when the lens barrel is pulled out, the safety lever 35 gradually slides to the right by the force of the spring, and when the lens barrel is completely pulled out, it is in the advanced state as shown in FIG. 3. On the other hand, when the lens barrel is retracted, the safety lever 3 is pushed by the cam surface of the relief part.
5 gradually slides to the left against the spring, and when storage is completed, it enters the blocked state as shown in FIG.
If the slope of this cam surface is made steep, the blocking state as shown in FIG. 1 can be achieved even before the storage is completed.

As mentioned above, the present invention makes it possible to mechanically prevent the release operation of the electromagnetic release by using a safety lever that detects whether the lens barrel is in the retracted or unretracted state. This has the effect of preventing a situation where the electromagnetic release is inadvertently activated due to the shock applied when the barrel is in the retracted state, which means that the shutter malfunctions can be prevented.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway plan view showing a shutter equipped with a shutter malfunction prevention mechanism according to the present invention in a set state and a retracted state, and Fig. 2 shows a state in which the main parts of Fig. 1 are pulled out from the camera body. Figures 3 and 4 are partially cutaway plan views shown in Fig. 2 (the cutting position is different from Fig. 1), and Figs. FIG. 1... Shutter board, 2... Shutter blade, 3
...Magnet, 3a...Iron core made of permanent magnet, 3
b... Coil, 4... Open iron piece lever (locking lever member), 4a... Iron piece, 4c... Dowel, 11...
... Spring, 30 ... Shutter holding plate, 31 ... Camera body side member, 31a ... Relief part, 35 ...
Safety lever, 35a... arm, 35b... protrusion,
36...Spring.

Claims (1)

[Claims for Utility Model Registration] An electromagnetic device including a permanent magnet, which is disposed oppositely so that a repelling force acts on the electromagnetic device, and the state of contact with the device is controlled by the magnetic force of the permanent magnet. a locking lever member that is held by suction, and an operating habit in the direction of opening the shutter blade, the tension state of which is suppressed by the locking lever member in the abutting state, and the electromagnetic device an electromagnetic release type comprising: a drive member that operates when the locking lever moves away and its inhibition is released when the permanent magnet is reversely excited and the attraction/holding is released; Equipped with a shutter,
In a collapsible camera in which a lens barrel equipped with the shutter can be stored in a camera body, a first position faces a movement area of the locking lever member and inhibits movement away from the electromagnet device; a safety lever member that is movable between a second position where the lens barrel is retracted out of the operating area and enables a separation operation; and a safety lever member that is movable when the lens barrel is housed in the camera body. A camera body comprising a holding part that is held in a first position and a movement allowing part that does not inhibit movement of the safety lever member to a second position in a shooting state in which the lens barrel is pulled out from the camera body. A shutter malfunction prevention mechanism for a retractable camera characterized by comprising a side member and.