JPS6224269Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is an electric shutter in which the aperture aperture and shutter speed are controlled by a set of shutter blades, and the exposure is controlled by an exposure control circuit via an electromagnet. In so-called daytime sync photography, where flash photography is performed using a strobe to soften the contrast between light and dark or to perform backlit photography, the firing timing is synchronized regardless of the aperture value, and the firing timing is synchronized regardless of the aperture value. This invention relates to a flash synchronizer that avoids the effects of bounce.

First, the prior art will be explained with reference to FIGS. 1 and 2, and then the present invention will be explained with reference to FIG.

In FIG. 1, 1 is an aperture, 2 is a cam 2a, 2b, 2c, 2d, and 2e.
Setting the aperture value and other operations, for example, if there is a device that switches when using a strobe, the device that switches it (whether it is an automatic device or a device that is operated independently) The aperture setting member 3 is rotated around the aperture 1 in conjunction with the operation of the guide number and distance setting by the operation of .), or the operation to make exposure control into single program control, etc. An electromagnet whose operation is controlled by an exposure control circuit (not shown);
a, an arm 4b, an insulating switch pin 4c, and grooves 4d and 4e.
A release operating member 8 is pivotally supported by a shaft 5 and is given levorotatory action by an iron piece spring 9, and a release operating member 8a is connected with pins and slots d and 4e, and is given left-handedness by a release spring 7. , 8b, and an iron piece lever 10 formed by attaching an iron piece 8c attracted to the electromagnet 3 to the armature 8b.
has an arm 10a that engages with the armature 4a and an arm 10b that engages with the armature 8b, is pivoted by a shaft 5, and is given levorotation to the armature lever 8 by a hold spring 11 that is stronger than the armature spring 9. Hold lever, 12 is hook 12a, arm 4
an opening release member which has a pin 12b that engages with b, is pivotally supported by a shaft 6, is given dextrorotation by an opening release spring 13, and whose right rotation is restricted by a stopper pin 14; The aperture pin 1 is pivoted by an opening drive spring 17, is given dextrorotation by an opening drive spring 17, and engages the cams 2a to 2e.
5a and a switch pin 15 made of an insulating material.
A shutter opening/closing member 18, which has an arm 15c that faces down and engages the hook 12a, opens and closes the aperture 1 by operating a shutter blade (not shown). a shutter closing drive member which is supported, is given levorotation by a closing drive spring 19, is restricted from left rotation by a stopper pin 20, has an arm 18a that engages with the hook 8a, and a barb 18b that engages with the shutter opening/closing member 15; Reference numeral 21 is a synchro contact which is attached to the cover 18b in an electrically insulated state and engages with the shutter opening/closing member 15 to turn on the flash synchro circuit; 22 is a flash synchro circuit preparation switch which engages with the switch pin 15b; Reference numeral 23 indicates a start switch, which starts the control operation of the exposure control circuit when turned off, and 24 indicates a power switch for the exposure control circuit, which engages with the switch pin 4c.

Next, the operation will be explained.

FIG. 1 shows a charging state of the shutter.

In FIG. 1, when the release operating member 4 is slid to the right against the release spring 7, the switch pin 4 is first removed and the power switch 24 is turned on, and the electromagnet 3 is energized. It gives an adsorption effect to the iron piece 8b. As the release operation member 4 continues to slide to the right, the shutter 4a then pushes the arm 10a and rotates the hold lever 10 to the right, causing the hold spring 1 to rotate to the right.
Charge 1. Although the hold spring 11 is stronger than the iron piece spring 9, since the iron piece lever 8 is magnetically coupled to the electromagnet 3, it does not rotate to the right. The release lever 12 opens by pushing the pin 12b with the arm 4b in the final right stroke of the release operating member 4.
Rotate the arm to the left and remove the hook 12a from the arm 15c.

The shutter opening/closing member 15 is thereby rotated to the right by the shutter opening drive spring 17, and in conjunction with this right rotation, a shutter blade (not shown) is operated to open the aperture 1, and the aperture pin 15a is rotated to the right.
is engaged with the cam 2d to prevent its right rotation, and the aperture 1 is opened by a diameter corresponding to the amount of right rotation.

By turning the shutter opening/closing member 15 to the right, the shutter opening/closing member 15 turns on the preparation switch 22 of the flash synchro circuit and turns off the start switch 23, thereby starting the control operation of the exposure control circuit.

The exposure control circuit demagnetizes the electromagnet 3 at an appropriate time depending on other conditions such as the amount of field light and the setting value of the aperture setting member 2, and releases the magnetic coupling of the iron piece 8c. The iron piece lever 8 is thereby held in place by the arm 10b by the hold spring 11, which is stronger than the iron piece spring 9.
b is rotated to the right until it is restrained, and the arm 18a is disengaged from the arm 18a by the armature 8a.

The shutter closing drive member 18 is thereby released from its counterclockwise lock, rotates to the left by the closing drive spring 19, brings the synchro contact 21 into contact with the shutter opening/closing member 15, and turns on the flash synchro circuit. The strobe fires without any delay, and then it continues to rotate to the left and fires the mage 18b via the synchro contact 21.
Then, the shutter opening/closing member 15 is closed and pushed against the drive spring 17 to rotate it to the left, thereby closing the aperture 1.

When the shutter opening/closing member 15 rotates to the left, it creeps inside the hook 12a and returns to the state shown, and the start switch 23 and the preparation switch 22 are also turned on and off as shown.

Thereafter, when the rightward operation of the release operating member 4 is released, the release spring 7 returns to the leftward direction, and the opening release member 12 rotates to the right until it is restrained by the stopper pin 14, and the hook 12a moves to the arm 15c.
The iron piece lever 8 rotates to the left together with the hold lever 10 to press the iron piece 8c against the electromagnet 3 and stop, and the power switch 24 is turned off.

The shutter is charged by rotating the shutter closing drive member 18 to the right against the closing drive spring 19. This allows arm 18
a pushes the handle 8a and turns the iron piece lever 8 to the right,
Each member returns to the charge state shown in the figure by climbing over the cover 8a and entering inside and being engaged. During this charge operation, the shutter opening/closing member 15 rotates slightly to the right following the clockwise rotation of the shutter closing drive member 18, and the arm 15c engages and locks the shutter opening/closing member 15 with the hook 12a.

In the above shutter opening/closing process,
The relationship between the opening/closing of the aperture 1 and the turn-on timing of the flash synchro circuit by the synchro contact 21 is shown in a diagram as shown in FIG.

First, to explain the state in which the aperture 1 opens, the shutter opening/closing member 15 rotates to the right in FIG. Assuming that the aperture diameter corresponding to the aperture 1 is d ₁ in FIG. 2, and the elapsed time from when the aperture 1 is in a pinhole state, that is, when it begins to open until the aperture pin 15a contacts the cam 2d, is t ₁ , the aperture 1 is The opening state of the aperture 1 does not stop even when the aperture pin 15a contacts the cam 2d and continues to open due to the clearance required for the operation of the rotating parts of the shutter blade and other members. After an elapsed time t ₂ , it reaches a diameter d ₂ that is larger than the caliber d ₁ , and then it is rebound and after an elapsed time t ₃ , it becomes a diameter d ₃ that is smaller than d ₁ , after which this operation is repeated and it gradually attenuates.
Stabilize.

Since the aperture 1 opens in the above state, its closing operation is performed after a stable elapsed time _t4 in the open state, that is, in FIG. If the elapsed time is t ₄ or t ₁ in Fig. 2 when being pushed to the left and turned to the left, the flash synchro circuit is turned on at that point, and strobe light is emitted with almost no delay, Since the shutter opening/closing member 15 rotates to the left and begins to close the aperture 1 at , the peak of the flash light emission approximately coincides with the aperture diameter d ₁ and the desired flash effect can be obtained. However, if at the elapsed time t ₂ When the shutter closing drive member 18 rotates to the left to end the exposure, a flash peak occurs at an aperture larger than the set aperture value, resulting in an excessive flash effect, which has the drawback of becoming too small at the elapsed time _t3 . .

As a means to solve the above-mentioned drawbacks of the prior art, if the aperture pin 15a and the aperture setting member 2 are configured as a flash synchro switch, the second
In the figure, before the elapsed time t ₁ until the set aperture d ₁ is reached, the electromagnet 3 is demagnetized by the control operation of the exposure control circuit, the shutter closing drive member 18 is rotated to the left, and the shutter is closed at the elapsed time t ₅ . When the aperture is started, it is opened only to the aperture _d5 , which is smaller than the aperture _d1 , and this means that the aperture pin 15a and the aperture setting member 2
This is caused by the aperture pin 15a returning to its original position before it comes into contact with the flash, so the flash synchro switch does not turn on and the flash does not emit light.

Therefore, in order to solve the drawbacks of the prior art shown in FIG.
The flash synchronizer switch was set to be turned on in any case where the switch came into contact with the switch, but since the most common malfunction in electrical circuits is caused by contact points, the number of contact points in the switch increases. This resulted in drawbacks such as increased circuit instability and the need for more sophisticated component quality control.

In view of the above-mentioned drawbacks of the conventional technology, the present invention has a single contact point for the flash synchro switch, and as a result, shooting is performed at an aperture smaller than the set aperture value, or the shutter blade is To provide a flash synchronizer capable of synchronizing flashes at a set aperture value in any case where a shutter closing operation is performed during bouncing.

Hereinafter, the present invention will be explained with reference to illustrated embodiments.

In FIG. 3, to mainly explain the differences from the explanation in FIG. 1 showing the prior art, 118 is the axis
The arm 118a, the arm 118
The shutter closing drive member 115A has a switch pin 115Ab made of an insulating material, an arm 115Ac that engages with the hook 12a, and a shutter closing drive member 115A.
It has an arm 115Ad that engages with the arm 8b and a pin 115Ae that is planted downward, is pivotally connected by a shaft 16, and is given dextrorotation by an opening drive spring 17. A shutter opening drive member 115B is a shaft 125 that operates a shutter blade (not shown) to open and close the aperture 1.
It is pivotally connected to the shutter closing drive member 118 by a spring 126, is given dextrorotation by a spring 126, has an aperture pin 115Ba that engages the cams 2a to 2e of the aperture setting member 2, and has an arm 115Bd. ,
This aperture control member has a synchro contact 115Be that engages with a pin 115Ae attached in an insulated manner to its tip.

Next, the operation will be explained.

When the arm 115Ac is released from the hook 12a by the shutter release operation, the shutter opening driving member 115 is moved by the opening driving spring 17.
A turns to the right and turns on the preparation switch 22 of the flash synchro circuit, and also turns on the start switch 23.
Turn off. Furthermore, in conjunction with this clockwise rotation, a shutter blade (not shown) operates to begin opening the aperture 1.

The aperture control member 115B is preloaded with a spring 126.
The arm 1 is rotated clockwise until the aperture pin 1155Ba is restrained by the cam 2d.
The synchronizing contact 115Be at the tip of the pin 15Bd is waiting at a predetermined position, and the pin 115Ae, which has rotated to the right about the shaft 16, is restrained by this, and at this time, the synchronizing flash circuit is turned on.

The electromagnet 3 rotates the iron piece lever 8 to the right,
When arm 118a is unlatched by a, and shutter closing drive member 118 is allowed to rotate to the left, shaft 125 also rotates to the left about shaft 16, thereby causing aperture control member 115B to rotate to the left about aperture pin 115Ba.

The shutter opening drive member 115A has its pin 11
5Ae is engaged with the synchro contact 115Be, the arm 115 is rotated via the synchro contact 115Be by the above-mentioned left rotation of the aperture control member 115B.
Pushed by Bd, the shutter opening drive member 115A rotates to the left, and the shutter blade begins to close.
Finally, the arm 115Ad is pushed by the armature 118b, and the arm 115Ac is engaged with the hook 12a. In addition, this maze 118b is the aperture pin 115Ba.
When the arm 115Ad is engaged with the highest cam 2e, the arm 115Ad is pushed up very slightly,
Or, when the cam 2a is engaged with the lowest cam 2a without being pushed up, the shutter opening drive member 115A is pushed up the most, and when the shutter is closed, the shutter opening drive member 115A
Always maintain a constant posture.

Open the shutter in the state shown in Figure 3,
If the shutter opening drive member 115A rotates to the right and the exposure control circuit activates the electromagnet 3 to rotate the shutter close drive member 118 to the left before its pin 115Ae reaches the synchro contact 115Be, the aperture control is performed in the same manner as described above. Since the member 115B is rotated counterclockwise to bring the synchronizer contact 115Be into contact with the pin 115Ae, and the shutter opening drive member 115A is rotated counterclockwise, the flash synchronizer circuit is turned on even when performing exposure with an aperture smaller than the initially set aperture value. be done. Therefore, for any of the elapsed times t ₁ to _{t 4} from the start of exposure to the end of exposure, for the aperture d ₁ of the aperture value set in FIG.
The flash synchro circuit is turned on at _d1 , and when the elapsed time is _t5 , it is turned on at the aperture _d5 at that time.

The charging operation of the shutter and the operation of each member thereby are substantially the same as in the case of FIG. 1, so a description thereof will be omitted.

According to the present invention, as described above, the aperture control member 115B whose attitude is controlled by the aperture setting member 2 whose attitude is controlled by manually setting the aperture aperture or in conjunction with the setting of the distance, and the shutter. Shutter opening drive member 115 that opens and closes the blade
It constitutes a flash synchro switch with A as the contact point, and when the two contact, the flash synchro circuit is turned on, so the aperture diameter is manually set and the shutter speed is adjusted accordingly. Even when performing exposure control using an aperture priority method controlled by an exposure control circuit, or when performing exposure control using a program method where the combination of aperture value and shutter speed is determined for each light value, the aperture When the aperture reaches the set aperture manually or automatically, the flash synchro circuit is turned on, producing the effect that the flash can emit light without being affected by the bouncing operation of the shutter blade.

According to the present invention, the shutter opening drive member 115
Even if the shutter opening operation is inhibited by the cams 2a to 2e of the aperture setting member 118 via the aperture control member 115B, the aperture control is performed by the shutter closing drive member 118 before this inhibition is performed. Even when the shutter is closed via the member 115B, the shutter opening drive member 11
5A and the aperture control member 115B are configured as one contact point and the other contact point of the flash synchro switch, so that in any of the above cases, the flash synchro switch can be operated with one set of contact points. Since there is no need to use different contacts in each case, the contact part, which is the most prone to failure and unstable part of the electrical circuit components, can be eliminated, improving reliability and reducing component management costs. It is possible to obtain extremely effective practical effects such as being able to reduce the

[Brief explanation of the drawing]

FIG. 1 is a front view showing an example of the prior art, FIG. 2 is a waveform diagram showing the interrelationship between shutter operation and flash synchro switch operation, and FIG. 3 is a front view of an embodiment of the present invention. 1...Aperture your, 2...Aperture setting member, 3
... Electromagnet, 4 ... Release operation member, 7 ... Release spring, 8 ... Iron piece lever, 8c ... Iron piece,
9... Iron piece spring, 10... Hold lever, 11
...Hold spring, 12...Opening release member,
13...Opening release spring, 115A...Shutter opening drive member, 115Ab...Switch pin,
115B...Aperture control member, 115Ba...Aperture pin, 115Bd...Synchro contact, 17...Opening drive spring, 118...Shutter closing drive member,
19...Close drive spring, 22...Ready switch,
23...Start switch, 24...Power switch.

Claims (1)

[Scope of Claim for Utility Model Registration] A shutter opening driving member that opens the shutter during forward movement and closes the shutter during backward movement, is biased by an opening driving spring and constitutes one flash synchro contact, and an exposure control circuit. a shutter closing drive member whose operation is locked by an electromagnet whose operation is controlled by a shutter closing drive member whose operation is controlled by an electromagnet and which is biased by a closing drive spring; an aperture setting member for setting the position of the cam; and a first portion of the aperture setting member that is rotatably disposed and that is in a direction that abuts the cam of the aperture setting member, and that constitutes the other flash synchronization contact. The second portion of the shutter opening drive member is given an operating habit in a direction in which it enters a forward movement range of the shutter opening drive member,
and an aperture control member whose second portion is displaced so as to move the shutter opening drive member backward by the operation of the shutter closing drive member; A flash synchro switch device configured such that the flash synchro switch is turned on when two parts engage with each other.