JPS6210742Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a synchro tuning device for a programmed electric shutter.

Since the aperture diameter of the program shutter varies depending on the exposure control status, when using a mechanical switch to synchronize the flash photography corresponding to each maximum aperture, conventionally the synchro switch was a moving contact type. However, the structure was complicated and stable operation could not be obtained.

The present invention makes it possible to always close the synchro switch in almost the same state when controlling the shutter to close, so that flash light is stably emitted when each aperture is at its maximum, and the shutter blade is closed. To provide a synchro tuning device for a programmed electric shutter which prevents erroneous light emission by opening an auxiliary switch connected in series with the synchro switch in accordance with the position of the synchro switch.

The present invention will be explained in detail below based on embodiments shown in the drawings.

In FIGS. 1 to 4, reference numeral 1 denotes a shutter base plate, which has cutout portions 1a, 1b, and 1c.

Reference numeral 2 denotes a release plate which is arranged to be movable in the vertical direction and is given an upward movement habit by a spring 3, and has a protrusion 2a and a bend 2b for operating a power switch So of a shutter control circuit (not shown). There is. 4 is a release lock lever pivotally connected to a support shaft 2c on the release plate 2, and has an arm 4a and a hook 4.
b, and the amount of left rotation is limited by the bend 2b.

Reference numeral 5 designates a set plate which is arranged to be movable in the left and right direction, and forms a rack 5a, a hook 5b, bends 5c and 5d, and a protrusion 5e. A gear 6 is pivotally connected to the shaft 7, and includes a pinion 6a that meshes with the rack 5a. A flywheel 8 is pivotally connected to the shaft 9 and includes a pinion 8a that meshes with the gear 6. 10 is pivotally connected to a support shaft 5f on the set plate 5,
It is a swinging lever made of a conductive material that is given levorotation by a spring 11 hung between it and the set plate 5, and forms a hook 10a, and a pin 10b is installed so that the amount of left rotation can be bent. 5c.

Reference numeral 12 denotes an electromagnet, which is composed of an iron core 12a, a coil 12b, and a yoke 12c. Reference numeral 13 denotes an iron piece that can see-saw at the tip 12c' of the yoke 12c and is provided with levorotation by a spring (not shown). The structure of the iron piece 13 is omitted because it is well known as a so-called hinge-type electromagnet device. 14 is an iron piece lever supported by iron piece 13;
Bend 14a that can engage hook 5b of set plate 5
, an arm portion 14b that can push the pin 10b of the swing lever 10, and a slope 14c that can be contacted by the pin 10b after the set plate 5 has moved a predetermined amount to the right.

Reference numeral 15 denotes an opening/closing lever made of synthetic resin that is pivotally connected to a shaft 16, and includes a moon-shaped pin 15a that can be engaged with the hook 10a of the swinging lever 10, and a moon-shaped pin 15a that passes through the pin 15b and the notch 1b to the back side of the shutter base plate 1. A pin 15c protruding from the top and a protrusion 15d are integrally molded. In addition, each pin may be fitted with a metal ring as appropriate.
It is also possible to replace it with a metal pin by caulking. 17 is a shutter blade that also serves as an aperture blade, which is one of a set of two symmetrical blades, and pin 15c
An arc-shaped elongated hole 17a into which the light receiving window 17a is fitted, a warning light receiving window 17b, and an exposure control light receiving window 17c are formed.

18 is the bending 5d of the set plate 5 and the opening/closing lever 15
The spring hung between the pin 15b acts as a force source for moving the set plate 5 to the right and a force source for rotating the opening/closing lever 15 to the left.

Reference numeral 19 designates a self-timer setting board that is given left-handed rotation by a spring 20, and a shaft portion 19a passes through the shutter base plate 1 and projects to the back side, and is loosely fitted into a notch 1c of the shutter base plate 1 to limit the rotation angle. pin 19b for operating the switch _S1 for setting the self-timer preparation state, and the protrusion 19.
d and the stepped portion 19e are integrally molded. The shaft portion 19a protruding toward the back side of the shutter base plate 1 is connected to a self-timer set member disposed in front of the camera when the present shutter device is incorporated into the camera. Reference numeral 21 designates a self-timer lock lever pivotally connected to the shaft 22, which includes a hook 21a that engages with the protrusion 19d and can also engage with the step 19e;
A hook 21b that can be engaged with the hook 4b of the release lock lever 4 and a protrusion 21c that can be pushed by the protrusion 5e of the set plate 5 are formed.

A spring 23 is placed between the release lock lever 4 and the self-timer lock lever 21, and acts to rotate both to the left.

On the back side of the shutter base plate 1, there is a shutter blade 17.
A cover member (not shown) made of synthetic resin for suppressing the temperature is disposed, and 24 indicates an aperture formed in the cover member. Further, the cover member is also formed with a long hole for regulating the amount of movement of the pin 15c of the opening/closing lever 15. Reference numeral 25 denotes a protrusion extending from a part of the cover member and protruding toward the front side of the shutter base plate 1, and a cross-shaped cut groove is formed on the end surface of the protrusion.

A printed circuit board is disposed on the front side of the shutter base plate 1 at a distance so as not to impede the movement of each component and not to block the aperture 24, and 26 denotes a light receiving element mounted on the printed circuit board. A light introducing hole for the light receiving element 26 is formed in the cover member, and a light receiving lens device with a length that reaches the front of the camera is disposed on the front side of the light introducing hole (the back side of the paper).

Reference numeral 27 denotes a synchro contact piece A, which is attached to the printed circuit board, and whose tip end corresponds to the protrusion 15 of the opening/closing lever 15.
It is designed to be pushed by d. Reference numeral 28 denotes a synchro contact piece B, which is supported by the cut groove of the protrusion 25 and arranged so as to be able to come into contact with the contact piece A27. 29
is a synchro contact piece C, which is supported by the cut groove of the protrusion 25 and electrically connected to the contact piece B28, and is arranged so as to be able to receive contact with the swing lever 10.
That is, the swing lever 10 is electrically connected to the printed circuit board via the body ground, and the synchro contact piece A
27, B28, C29, the swing lever 10, and a path of the printed circuit board constitute a synchro control circuit in which two switches are connected in series.

Further, the above-mentioned switch _S1 is also supported on the printed circuit board.

Furthermore, the power switch _S0 is actually composed of a conductive pattern formed on the lower surface of the printed circuit board (the surface facing the shutter base plate 1) and a brush attached to the surface of the protrusion 2a on the release plate 2. It is something that

The operation will now be described in conjunction with FIGS. 5 and 6.

Although FIG. 1 shows the entire shutter mechanism in a stationary state, setting is performed by moving the setting plate 5 to the left against the tension of the spring 18. That is, when the set plate 5 is moved to the left, the swing lever 10 also moves together, and when the pin 10b comes off the arm 14b of the iron piece lever 14 in the process, the swing lever 10 is bent by the tension of the spring 11. 5c, the hook 10a overcomes the moon-shaped pin 15a of the opening/closing lever 15 and becomes ready for engagement, while the hook 5b overcomes the bend 14a of the iron piece lever 14 and engages. This complete set condition is partially illustrated in FIG.

Next, when the release plate 2 is pushed down against the tension of the spring 3 during photographing, the power switch _S0 is first closed by the protrusion 2a.

At this time, the warning light receiving window 17 of the shutter blade 17
Since the light-receiving element 26 is exposed to field light by b, a warning circuit is activated to display overexposure, proper exposure, underexposure, etc., as shown in FIG.

When the release plate 2 is further pushed down, a timer start switch (not shown) is operated, and the timer circuit starts operating. During normal shooting, an output signal is generated from the timer circuit after an extremely short delay time, and the electromagnet is activated. Pulses are applied to the 12 coils 12b, causing a large current to flow. Therefore, the iron piece 13 is attracted to the electromagnet 12 against its habit, and the iron piece lever 14
are rotated to the right to remove the bend 14a from the hook 5b of the set plate 5. Note that the current flowing through the coil 12b is suppressed to a low current value after the electromagnet 12 attracts and holds the iron piece 13.

The unlocked set plate 5 then starts to move to the right due to the tension of the spring 18, pulls the opening/closing lever 15 by the swing lever 10, and engages the lever 15 with the rack 5a. It is rotated to the right at a constant speed under the action of the flywheel 8 system.

By turning the opening/closing lever 15 to the right, on the one hand, the synchro contact piece A27 is restored and comes into contact with the synchro contact piece B28 due to the retraction of the protrusion 15d, and the ready state of the synchro control circuit is established, and on the other hand, the shutter blade 17 starts rotating due to the fitting relationship between the pin 15c and the elongated hole 17a, and the light receiving element 26 is temporarily blocked from the field light by the combination of the two blades, and then the light receiving window 17c for exposure control is opened. At the same time, the aperture 24 is opened.

Note that the light-receiving element 26 is temporarily blocked from the field light and enters a state where an underexposure warning is issued, but the fifth
As shown in the figure, since the warning circuit is rendered inoperable by the output signal of the timer circuit, false warnings are not issued.

Further, at the beginning of the clockwise rotation of the opening/closing lever 15, an exposure control preparation switch (not shown) is operated.

Furthermore, the aperture 24 formed by the shutter blade 17
If the timing at which the light receiving window 17c for exposure control starts introducing field light to the light receiving element 26 is made earlier than the start of opening, the so-called mechanical delay can be corrected.

Then, due to the operation of the exposure control circuit, the current to the coil 12b is cut off after a predetermined time and the electromagnet 12 is cut off.
When the iron piece 13 is demagnetized, the iron piece 13 rotates counterclockwise with the iron piece lever 14 due to its habit.

FIG. 3 shows a state in which the set plate 5 moves to the right to the final range of the opening operation, fully opening the shutter blade 17. However, when the iron piece lever 14 turns to the left, the swinging lever 10 moves so that the pin 10b moves to the arm 14b. , it rotates to the right as shown by the two-dot chain line against the tension of the spring 11, contacts the synchro contact piece C29, and if the flash device is attached, it emits light, and the hook 10a It comes off from the moon-shaped pin 15a. Therefore, the opening/closing lever 15 rapidly rotates to the left due to the tension of the spring 18, closes the shutter blade 17, and returns to the position shown in FIG.
d, the synchro contact piece A27 is pushed and separated from the synchro contact piece B28. Also, when the swing lever 10 comes off the opening/closing lever 15, the set plate 5
moves further to the right due to the tension of the spring 18 and moves to the first
Return to the position shown in the figure.

Note that if an output signal for demagnetizing the electromagnet 12 is generated from the exposure control circuit while the set plate 5 is reaching the position shown in FIG. The same operation is performed, and the shutter blade 17 is closed from the middle of opening.

In the above operation, when the set plate 5 starts moving rightward from the state shown in FIG.
The opening/closing lever 15 and the set plate 5 are integrally connected via the spring 18, and both ends of the spring 18 are hung on the integrated member. The relationship that can act as a source of opening force for movement to the right will be explained with reference to FIG.

The center point of the shaft 16 of the opening/closing lever 15 is O, the point of action of the opening/closing lever 15 and the swinging lever 10 is M, the point of action of the spring 18 and the setting plate 5 is N, and OM
= R ₁ , ON = R ₂ , ∠MON = Θ, and further spring 1
Let T be the torque at point 8, P ₁ be the reaction force at point M, and P ₂ be the reaction force at point N in the direction of movement of set plate 5.
Each of the reaction forces P ₁ and P ₂ is expressed as P ₁ =T/R ₁ P ₂ /CosΘ=T/R ₂ ∴P ₂ =T·CosΘ/R ₂ .

Then, since it is sufficient that the reaction force P ₂ is larger than P ₁ , P ₂ −P ₁ =T·CosΘ/R ₂ −T/R ₁ =T(R ₁ ·CosΘ−R ₂ )/R ₁ ·
When R ₂ >0, that is, R ₁ ·CosΘ−R ₂ >0, P ₂ >P ₁ .

Therefore, in the set state of FIG. 2, Θ is close to 0, so as in the embodiment, O
If point N is closer to point M than point M, R ₁ -R ₂ >0, and the spring torque acts as a force source to move the set plate 5 to the right.

Furthermore, since the opening/closing lever 15 and the setting plate 5 move integrally in the engaged state as shown in FIG.
Since there is little change in the spring torque, and accordingly, there is little change in the spring torque, the opening characteristic of the shutter blade 17 becomes linear.

Furthermore, since the load when setting the setting plate 5 from the state shown in FIG. 1 to the state shown in FIG. 2 is the spring torque set as the closing force source, the setting force can be small.

Further, as is clear from the state shown in FIG. 2, in the set state, the pin 10b of the swing lever 10 is
It has a predetermined distance from the slope 14c of the iron piece lever 14. That is, in the process of rightward movement of the set lever 5, the shutter blade 17 is set so that by the time the pin 10b reaches the locus of movement of the slope 14c, the shutter blade 17 has begun to open the aperture 24 with an extremely small diameter. It is something that

Therefore, a large current was passed through the coil 12b of the electromagnet 12 by the output signal of the timer circuit, and the release was performed by the excitation operation of the electromagnet 12. Even if this attraction cannot be maintained, the position of the slope 14c when the iron piece lever 14 separates from the electromagnet 12 and returns will be after the shutter blade 17 begins to open the aperture 24 as described above. As a result, the swing lever 10 is then rotated to the right so that the swing lever 10b climbs over the slope 14c, and the hook 10a is removed from the moon-shaped pin 15a. Therefore, the shutter blade 17 is closed from that point on, and as long as an open release is performed, an exposure operation is always performed, and even if the exposure is incorrect, so-called mechanical second photography is performed.

Next, referring to FIG. 4, setting and resetting during self-timer photography will be briefly explained.

After setting the setting plate 5, when the self-timer setting plate 19 is rotated to the right against the tension of the spring 20 by operating the shaft portion 19a, the hook 21 is attached to the stepped portion 19e.
When a faces the self-timer lock lever 21
is rotated to the left by the tension of the spring 23, so when the set plate 19 overruns and returns, the stepped portion 19e engages with the hook 21a and is held in the set state. In addition, in this set state, pin 19c changes the delay time in the timer circuit from an extremely short second, for example.
Open switch S ₁ for 10 seconds. On the other hand, the self-timer lock lever 21 is rotated to the left so that the hook 21b comes into the locus of movement of the hook 4b on the release lock lever 4, and the protrusion 21c comes into the locus of movement of the protrusion 5e on the set plate 5.

Therefore, when the release plate 2 is pushed down as described above, the release lock lever 4 swings against the tension of the spring 23 and is engaged with the timer lock lever 21, so that the power switch _S0 The closed state of is maintained.

Furthermore, since the timer circuit generates an output signal after a 10-second delay operation, the time in seconds becomes the self-timer operation time.

Furthermore, when the set plate 5 returns to the position shown in FIG. 1 after the exposure control operation, the protrusion 5e pushes the protrusion 21c to rotate the timer lock lever 21 to the right against the tension of the spring 23. Therefore, since the hook 21b is removed from the hook 4b, the release plate 2 returns to the position shown in FIG. 1 due to the tension of the spring 3, and the power switch is turned on.
_S0 is released, and the hook 21a is removed from the step 19e, so the timer setting board 19 is rotated to the left by the tension of the spring 20 and returns to the state shown in FIG.
It is reset by closing switch _S1 again.

In the above embodiment, the light emitting ignition switch of the synchro control circuit is constructed by making the swing lever 10 of a conductive material and the synchro contact piece C29, but the swing lever 10 is made of an insulating material such as synthetic resin. In the case of molding the spring 11 with material, one end of the spring 11 is hung on the side of the lever 10 opposite to the contact piece C29 without changing the direction in which it acts on the lever 10, so that the spring 11 is formed by the contact piece C29 and the spring 11. It can also be done.

Further, the synchro contact piece A27 is connected to the synchro contact piece C29 so that the synchro contact piece A27 provided opposite to the synchro contact piece B28 is controlled by the opening/closing lever 15.
A synchro contact piece (D) equivalent to the above may be provided oppositely, and the synchro contact piece (D) may be controlled by the swing lever 10.

Furthermore, although the set plate 5 is of the type that moves linearly, it can be changed to a type that moves in an arc.

Furthermore, by electromagnetically controlling both the opening and closing releases of the shutter and using one electromagnetic device as in the embodiment, the configuration is simplified and it becomes easier to introduce an electric self-timer. , various electrical controls can be performed.

However, the release release is not necessarily limited to being electromagnetically controlled, but may be mechanically controlled.

As described above, the synchro tuning device for a programmed electric shutter of the present invention can control the closing of the synchro switch in almost the same state at all times when controlling the closing of the shutter blades, so it can stably emit flash light when the respective aperture diameters are at their maximum. In addition, since the auxiliary switch connected in series with the synchro switch is opened in correspondence with the position where the shutter blade is closed, erroneous light emission can be prevented until the next exposure operation. It is something that never happens.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing the overall view of the shutter mechanism according to the present invention in a stationary state, Fig. 2 is a partial explanatory diagram of the shutter set state, Fig. 3 is a partial explanatory diagram of the shutter blade in a fully open state, and Fig. 4 5 is a partial explanatory diagram of the self-timer set state, FIG. 5 is an explanatory diagram of the operating system, and FIG. 6 is an explanatory diagram of the driving force action. 5... Set plate, 10... Swing lever, 10b
... Pin, 12 ... Electromagnet, 13 ... Iron piece, 14
...Silver lever, 14b...Arm, 14c...Slope, 15...Opening/closing lever, 17...Shutter blade that also serves as aperture blade, 18...Spring.

Claims (1)

[Claims for Utility Model Registration] An opening/closing member that drives a shutter blade, and an iron piece member that releases the opening and closing operations of the opening/closing member through operations corresponding to the two operations of excitation and demagnetization of an electromagnet. A programmable electric shutter comprising: a locking/disengaging means that changes its position in conjunction with the operation of the iron piece member to engage and disengage from the opening/closing member; a synchronizer switch that is opened corresponding to a position where the locking of the opening operation of the opening and closing member is released and is closed corresponding to a position where the locking of the closing operation of the opening and closing member is released; is provided with an auxiliary switch connected in series with the synchro switch, which is opened in correspondence with a position in which the shutter blade is closed, and is closed in correspondence with an initial position in which the shutter blade is moved in the opening direction. Synchro tuning device for programmed electric shutters.