JPH0225493B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hold release mechanism in a focus lockable electric shutter.

In electric shutters in which a drive lever is provided on the shutter set plate and the blades are opened and closed during the operating stroke of the set plate, the spring that applies a repulsion force to the closing control electromagnet is charged during the initial stroke of the set plate. The disadvantage is that the influence on exposure and mechanical delay errors become large, and as a result, proper exposure cannot be achieved. Therefore, in the electric shutter of a camera with built-in AF, the hold spring is charged during the final setting stroke of the AF set plate, and when the AF set plate moves, the force source of the hold lever is applied to the closing iron lever, creating a separation force. Normally, when the shutter button is pressed during shooting, the power switch is pressed during the first stroke, energizing the closing control electromagnet, and the second stroke is when the shutter button is pressed. The pulse opens and the control electromagnet is energized, and the start release lever is struck by the repulsive force of the opening iron lever.
There was no problem because the AF set plate started, but when shooting with focus lock, only the AF set plate takes the lead and releases the hold lever, but the electromagnet for closing control is temporarily energized, but the focus lock does not work. The problem was that when you let go of the lock lever, the power turns off, which causes the closing iron lever to separate, and the next time you press the shutter button, it goes into continuous shooting mode.

In view of the above-mentioned problems, the present invention has been devised so that the restraint on the hold lever is released only when the start release lever is activated, and a repulsion force is applied to the closing iron lever. The present invention aims to provide a hold release mechanism that allows reliable operation without malfunction even in the case of 1 shows a front view of the electric shutter including this embodiment in a set state and the arrangement of components on the back side, where 1 indicates an exposure opening 1a, two slots 1b,
1c and a bent portion 1d; 2, 2 is a pair of exposed blades pivoted at substantially symmetrical positions on the back surface of the shutter plate 1 and provided with slots 2a, 2a, respectively; 3 is a pair of exposed blades; Pins 3a, 3 are pivotally mounted on the shutter plate 1, are implanted at both ends thereof, and pass through the slots 1b, 1c, respectively.
an opening/closing lever that is connected to the exposed blades 2, 2 via b, and has a pin 3c implanted at one end, a protrusion 3d, and a bent portion 3e at the other end;
4 is a pin 3c of the opening/closing lever 3 and a set plate 6 which will be described later.
A spring 5 which acts as an opening force source and a closing force source for the opening/closing lever 3, which is hung between the shutter plate 1 and the bent portion 6a of the shutter plate 1, is composed of a sector gear and other gears pivotally mounted on the shutter plate 1. A delay device 5' is a delay device in which a pin 5a installed in the sector gear is in contact with a protrusion 3d of the opening/closing lever 3 to control the right-handed rotation characteristic of the opening/closing lever 3, that is, the opening rising characteristic of the exposed blades 2, 2. a spring imparting right-handed rotation behavior to the sector gear of the device 5;
Reference numeral 6 denotes a bent portion which is disposed on the shutter plate 1 so as to be slidable in the left and right direction, and has a bent portion 6a at one end, a hook portion 6b and a bent portion 6c at the other end, and extends to the back side of the plate 1. The shutter set plate 7 is pivotally mounted on the set plate 6 and has a concave portion 7 at one end that engages with the bent portion 3e of the opening/closing lever 3.
8 is a spring that is hung between the drive lever 7 and the set plate 6 and gives the drive lever 7 a right-turning behavior; 9 is a shaft; An iron piece lever which is pivotally mounted on the taper plate 1, has an arm part 9a at one end, has a pin 9b implanted at the other end which contacts the arm part 7b of the drive lever 7, and has an iron piece 9c pivotally mounted thereon. ,
10 is a spring that is hung between the iron piece lever 9 and the shutter plate 1 and gives the iron piece lever 9 a right-handed turning behavior; 11 is a spring that is disposed on the shutter plate 1 and that causes the iron piece lever 9 to rotate when energized. A closing control electromagnet 12 that attracts and holds the iron piece 9c is pivotally mounted on the shutter plate 1 and has a hook portion 1 at one end.
2a and a cam surface 12b, and the other end is provided with an arm portion 12c that abuts the arm portion 9a of the iron piece lever 9; 13 is the hold lever 1;
It is pivotally mounted on the shutter plate 1 coaxially with the hold lever 2, and has a bent portion 13a at one end that abuts the cam surface 12c of the hold lever 12, and has an edge on the other end that engages with a charge spring to be described later. Obtaining hook part 1
Charge spring locking lever provided with 3b, 14
is hung between the hold lever 12 and the charge spring locking lever 13, and the hold lever 12
A spring 15 is pivotally mounted on the shutter plate 1 and engages with the hook portion 12a of the hold lever 12 at its tip. 15a
16 is a hold locking lever with a slot 15b provided in the middle, and a pin 16a is implanted at one end to slide into the slot 15b of the hold lock lever 15. A start release lever is provided with an arm portion 16b at its end and further provided with a bent portion 16c and an arm portion 16d at its midway protruding end, 16' is a spring that imparts left-handed rotation behavior to the start release lever 16, and 17 is a shirt. It is pivotally mounted on the plate 1 and has a bent portion 17a at one end that engages with the hook portion 6b of the set plate 6, and a bent portion 17b extending toward the back side of the plate 1 at the other end. release lever,
A spring 18 is hung between the release lever 17 and the set plate 6, and provides the release lever 17 with left-handed rotation.

FIG. 2 shows a plan view in the set state, and reference numeral 19 is pivotally mounted on the bent portion 1d of the plate 1, and has an arm portion 19a at one end that can be engaged with the bent portion 16b of the start release lever 16. an intermediate lever provided with a fork portion 19b at the other end;
20 is a spring that is hung between the intermediate lever 19 and the bent portion 1d and gives the intermediate lever 19 a left-handed rotation behavior, and 21 is pivotally attached to the lower surface of the bent portion 1d and has a bent portion at one end. 21a and 21b are provided, and a bent portion 21c is provided at the other end, and a fork portion 19b of the intermediate lever 19 is provided at the midway projecting end.
22 is an iron piece fixed to the bent part 21a of the start iron lever 21, and 23 has one end hooked to the pin 21b of the start iron lever 21 and the other end. Hook portion 13b of charge spring locking lever 13
The charge spring 24, which is fixed to the start iron lever 21 and gives the left-handed rotation behavior to the start iron lever 21, is disposed on the lower surface of the bent portion 1d and has a built-in permanent magnet around which a coil is wound. This is a starting electromagnet that attracts the iron piece 22 but releases the iron piece 22 when a demagnetizing field is applied by energization such as a pulse.

In FIG. 3, reference numeral 25 is pivotally attached to the back surface of the shutter plate 1, and has an arm portion 25a at one end that contacts the bent portion 16c of the start release lever 16, and a bent portion 25b at the other end. Ta
AF plate lock lever, 26 is AF plate lock lever 2
a spring that is hung between the AF plate lock lever 25 and the plate 1 and gives the AF plate lock lever 25 a right-handed rotational behavior;
27 is attached to the back surface of the plate 1 so that it can be slid up and down and rotated by pin-slot connection, and has a cam surface 27a at the tip and an AF in the middle.
a focus lever provided with an edge portion 27b that can engage with the bent portion 25b of the plate lock lever 25;
28 is a spring that is hung between the focus lever 27 and the plate 1 and gives the focus lever 27 a right-handed rotation behavior; 29 is a cam that is installed on the back side of the plate 1 and that is attached to the focus lever 27; A pin 30 in sliding contact with the surface 27a is disposed on the back surface of the plate 1 so as to be slidable in the left and right direction.
The hook portion 30a that engages with the bent portion 25b of the AF plate lock lever 25 and the start release lever 16
A bent part 30b that can come into contact with the arm part 16d of the hold lever 12 is provided, and a pin 30c is implanted therein, and a pin 30d that can come into contact with the cam surface 12b of the hold lever 12 is implanted in the middle part, and is engaged with the charge spring 23. Hook portion 30e and release lever 17 that can be combined
AF set plate 31, which is provided with an end surface 30f that can come into contact with the bent part 17b of the shutter set plate 6, and another protruding part 30g, and further has a protruded part 30h that can come into contact with the bent part 6d of the shutter set plate 6 at the other end. is AF set plate 3
AF set leaf spring stretched between 0 and plate 1 to give rightward movement behavior to AF set plate 30; 32 is a sector gear and other gears pivotally mounted on shutter plate 1; The fork portion 32a provided on the sector gear is slidably engaged with the pin 30c of the AF set plate 30, and the delay for controlling the rightward movement characteristic of the AF set plate 30, that is, the delay time for distance selection is a banner, Reference numeral 33 denotes a focus ring which is rotatably arranged around the optical axis and has a pin 33a implanted therein which contacts the protrusion 30g of the AF set plate 30, and a rack 33b provided on the outer periphery; and 34 a focus ring. The spring 35 that gives the focus ring 33 its right-handed rotational behavior consists of a ratchet gear, a ratchet, and an AF electromagnet arranged on the back surface of the plate 1, and the ratchet gear meshes with the rack 33b of the focus ring 33. A latch mechanism 36 that latches the focus ring 33 when the distance is selected by the AF signal can rotate in conjunction with the automatic film winding mechanism and engages with the protrusion 30h of the AF set plate 30 at a 180° symmetrical position on the surface. It is a disc on which a pair of pins 36a, 36a that can be fitted are implanted.

SW ₁ is a trigger switch operated by pin 3c of opening/closing lever 3, SW ₂ is iron piece lever 9
The flash switch _SW3 is actuated by a member (not shown), and is a film winding changeover switch actuated by the bent portion 6c of the shutter set plate.

FIG. 4 shows an electric circuit for winding the film and setting the shutter. M is the motor for winding the film, SW ₄ is a changeover switch which is switched every 1/2 rotation of the disc, and E is the power supply.

The electric shutter including the hold release mechanism according to the present invention is configured as described above, so for normal shooting, when the shutter button is pressed, the first switch (not shown) turns on, displays a warning, detects battery, etc. If the power source E is equal to or higher than the specified voltage in the first stroke state, preparations for proceeding to the next state are completed. In addition, at this time, the electromagnet 1 for closing control
1 is in the energized state. Next, when the second stroke (not shown) is entered and the second switch is turned ON, the power source E is latched by the power transistor, and at the same time, the starting electromagnet 24 is pulsed by the dividing period constituted by the CR oscillation circuit. A certain amount of time (sufficient time for the coil of the starting electromagnet 24 to rise) is given. This pulse signal generates a demagnetizing field in the starting electromagnet 24, and this magnetic flux causes the starting electromagnet 24 to lose its attractive force, so that the starting iron lever 21, which had been attracted until then, is moved by the charge spring 23 as shown in FIG. The patient is rapidly rotated to the left. Then, intermediate lever 1
9 rotates to the right against the spring 20 and strikes the arm 16b of the start release lever 16 with its arm 19a, causing the start release lever 16 to rotate to the right in FIG. 3 against the spring 16'. The bent portion 16c of the start release lever 16 pushes the arm portion 25a of the AF plate lock lever 25 to rotate the AF plate lock lever 25 to the left against the spring 26.
Then, the bent part 25b of the AF plate lock lever 25
Since the hook portion 30a of the AF set plate 30 is released, the AF set plate 30 is moved rightward by the spring 31 while receiving the action of the banner 32. At this time, start release lever 16
The hold locking lever 15 is rotated counterclockwise in FIG.
The hold lever 12 tries to turn to the right by the spring 14, but since the iron piece 9c of the iron piece lever 9 for closing control is attracted and held by the electromagnet 11 for closing control, the arm part 12c of the hold lever 12 is rotated by the arm of the iron piece lever 9. It remains in contact with the section and its rotation is prevented. Therefore, a force is acting on the iron piece lever 9 that tends to separate it from the electromagnet 11. Furthermore, since the hold lever 12 is prevented from turning clockwise, the charge spring locking lever 13 also does not turn clockwise.
The charge spring 23, once released by the rightward movement of the AF set plate 30, is immediately locked by the hook portion 13b of the locking lever 13, and its spring force is not lost. Next, the AF setting plate 30 further moves to the right, and the focus ring 33 rotates accordingly to select a distance from near to ∞ or from ∞ to near.
Thereafter, the end surface 30f of the AF set plate 30 pushes the bent portion 17b of the release lever 17 (FIG. 3) and rotates the release lever 17 to the right against the spring 18, so that the bent portion 17a The set plate 6 is removed from the hook portion 6b, and the set plate 6 begins to move rightward by the spring 4. When the set plate 6 starts to move rightward, the recess 7a of the drive lever 7 pushes the bent part 3e of the opening/closing lever 3, so that the opening/closing lever 3 rotates to the right under the action of the delay device 5. The exposure blades 2, 2 begin to gradually open the exposure opening 1a. On the other hand, by turning the opening/closing lever 3 to the right, the pin 3c separates from the trigger switch SW ₁ , so the trigger switch SW ₁ is turned OFF, and a light power source suitable for the subject light starts charging the time-fixing capacitor through the light receiving element. After proper exposure commensurate with the subject brightness, the current to the closing control electromagnet 11 is cut off, so the electromagnet 11 loses its attractive force and releases the closing control iron lever 9c. Therefore, the closing control iron piece lever 9 is rotated to the left against the spring 10 by the spring force source of the hold lever 12, that is, the spring 14. At this time, the charge spring locking lever 13 also rotates to the right and its hook portion 13b disengages from the charge spring 23, and the unlocked charge spring 23 returns to the right direction in FIG. It is locked. On the other hand, as the closing control iron lever 9 rotates to the left, its pin 9b pushes the arm 7b of the drive lever 7, so the drive lever 7 rotates to the left against the spring 8, and the recess 7a bends the opening/closing lever 3. It comes off from section 3e. Therefore,
Since the opening/closing lever 3 is rotated to the left by the spring 4, the exposure blades 2, 2 close the exposure opening 1a halfway, thereby completing the exposure. In addition, during long-term exposure, the opening/closing lever 3 operates the full stroke and maintains the fully open state (temporarily remains stopped), and when the closing control electromagnet 11 operates, the recess 7a of the drive lever 7
When the opening/closing lever 3 comes off from the bent portion 3e, it is cut off from the set plate 6 and the opening/closing lever 3 turns to the left, but the set plate 6 further moves by the remaining stroke and returns to the home position and stops. This is a very effective method since it does not affect the exposure when taking the exposure end signal (motor winding signal, etc.) from the set plate 6.

Next, to explain the film winding operation and the shutter setting operation, first, before the setting operation, the start iron lever 21 is moved by the charge spring 2.
3 is released from the hook portion 13b of the locking lever 13, it has moved to the bent portion 21c of the iron piece lever 21 and has almost lost its charging force, so that the spring force source of the intermediate lever 19, that is, the spring 20 The starting electromagnet 24 is rotated to the right and returned to the set position by
(by the magnetic force of the built-in permanent magnet). Now, as described above, when the set plate 6 moves to the right end in FIG.
then switches the film winding switch _SW3 from terminal A to terminal B in FIG. Then, the film winding motor M rotates to wind the film, and the disc 36 rotates to the right in FIG. Therefore, AF set plate 3
0 is moved to the left in FIG. 3 while charging the AF set plate spring 31, and during this certain stroke, the protrusion 30h moves toward the shutter set plate 6.
Since the bent portion 6d of the shutter set plate 6 is pushed
6 is also moved to the left in FIG. 1 while charging the spring 4. Note that by moving the shutter set plate 6 to the left, the changeover switch SW ₃ is switched from terminal B to terminal A, but due to the rotation of the disc 36, the switch
In the figure, since the changeover switch _SW4 is switched from terminal D to terminal C, the rotation of the motor M is continued, and therefore the leftward movement of the AF setting plate 30 and the shutter setting plate 6 is continued. Also, at this time, the pin 30d of the AF set plate 30 pushes the cam surface 12b of the hold lever 12 to rotate the hold lever 12 to the left, so that its force source, that is, the spring 14, is charged. Meanwhile, the iron piece lever 9 is rotated to the right by the spring 10, and the iron piece 9c contacts the closing control electromagnet 11 to maintain a close contact state.
At the same time, the hook portion 12a of the hold lever 12 engages with the hook portion 15a of the hold locking lever 15, which has already been restored. Further, the shutter set plate 6 has its hook portion 6b locked with the bent portion 17a of the shutter release lever 17. or,
The hook portion 30a of the AF set plate 30 is also locked to the bent portion 25b of the AF plate lock lever 25. On the other hand, when the AF set plate 30 moves to the left, the charge spring 23 has one end attached to the hook portion 30.
e and moves to the left, pushes the slope of the charge spring locking lever 13, rotates it to the right, and falls into the hook portion 13b, resulting in a charge state. At this time, the charge spring 23 is still attached.
It engages with the hook portion 30e of the AF set plate 30. Therefore, a left turning force is applied to the start iron lever 21 in FIG. In this way, the shutter setting is completed, but at this time the disc 36 has rotated 1/2 turn, and at this point, the changeover switch SW ₄ is switched from terminal C to D in FIG.
When the power supply is cut off, both ends of the motor M are short-circuited, and the motor M suddenly stops. In the above operation, the set plate 6
Since the motor M is switched on in the final operating region (the opening/closing operation of the shutter has already been completed), no malfunction occurs. Furthermore, even if the shutter button is held down, it is possible to wind the film and set the shutter once the shutter opening/closing operation is completed, so there are fewer interlocking switches compared to conventional cameras that change the switch when the shutter button returns. In addition, the release stroke is also small, and the quick shooting performance is also excellent.

In addition, in place of the above changeover switch SW ₄ ,
Slider S linked to motor M as shown in the figure
A changeover switch SW ₄ ′ composed of a conductor pattern P and a conductor pattern P may also be used.

Next, to explain about self-timer photography, when the self-timer switch is turned on, the first and second switches are turned on at the same time, the timer works for 10 seconds, the power latch circuit is activated, and the timer is turned on. After the operation is completed, a pulse is applied to the start electromagnet 24, and thereafter the same operation as the above-mentioned normal photographing is performed.

Next, explaining focus lock photography, when the focus lever 27 is pushed down in FIG. 3, the edge portion 27b pushes the bent portion 25b of the AF plate lock lever 25 downward,
The AF plate lock lever 25 rotates to the left and its bent portion 2
5b comes off from the hook portion 30a of the AF set plate 30, and as a result, the AF set plate 30 is removed from the delay governor 3.
2, the AF set plate spring 31 moves the AF set plate spring 31 to the right. Therefore, although one end of the charge spring 23 is once unlocked, it is immediately locked by the hook portion 13b of the charge spring locking lever 13, so that the charging force of the charge spring 23 is not lost. Further, the focus ring 33 rotates to follow the rightward movement of the AF set plate 30 to select a distance from near to ∞ or from ∞ to near. After this
The bent portion 30b of the AF set plate 30 is locked to the arm portion 16d of the start release lever 16, and the rightward movement of the AF set plate 30 is stopped just before its end surface 30f comes into contact with the bent portion 17b of the release lever 17. It will be done. Thus, when the focus lever 27 is pressed down, only distance selection is performed and the condition is the same as the first stroke of the shutter button. Use of the focus lock ends in this state, move the camera so that the focused subject is at the desired position, press the shutter button, and then take the same shooting as above depending on whether you are using normal shooting or self-timer shooting. An action is taken.

As mentioned above, the hold release mechanism according to the present invention is designed so that the restraint of the hold lever is released and a separation force is applied to the closing iron lever only when the start release lever is activated.
Reliable operation without malfunctions is performed both during normal photographing and during focus lock photographing.

[Brief explanation of drawings]

FIG. 1 is a front view showing an electric shutter in a set state including an embodiment of the hold release mechanism according to the present invention, FIG. 2 is a plan view of the electric shutter, and FIG. 3 is a arrangement of components on the back side of the electric shutter. FIG. 4 is an electric circuit diagram for winding the film and setting the shutter of the electric shutter, and FIG. 5 is a diagram showing another example of the electric circuit. 1...Shutter plate, 2...Exposed blade, 3
...Opening/closing lever, 5...Delay device, 6...Shutter set plate, 7...Drive lever, 9...Iron piece lever, 11...Closing control electromagnet, 12...Hold lever, 13...Charge spring locking lever ,1
5...Hold locking lever, 16...Star release lever, 17...Release lever, 19...
...Intermediate lever, 21...Start iron lever, 2
2... Iron piece, 23... Charge spring, 24... Starting electromagnet, 25... AF plate lock lever,
27... Focus lever, 29... Pin, 30
...AF set board, 32...Delay governor, 33
... Focus ring, 35 ... Latch mechanism, 3
6... Disc, SW ₁ ... Trigger switch, SW ₂ ...
...Switch for flashing, SW ₃ ...Switch for film winding, SW ₄ ...Switch for film winding, M
...Film winding motor.

Claims (1)

[Claims] 1 The AF is biased in one direction and operates when the lock is released, allowing the focus ring to follow and focus, and then driving the release lever to open and close the shutter. A set plate, an AF plate lock lever that locks the AF set plate in the set position, and when the restraint is released in conjunction with the shutter release operation, the lock of the AF set plate by the AF plate lock lever is released and the lock is restrained. When the start release lever locks the AF set plate before driving the release lever, and when the AF plate lock lever is operated,
A focus lever that releases the inhibition of the AF set plate, a shutter set plate that is restrained by the release lever and starts operating when the restraint is released by the operation of the release lever, and a shutter set plate that is pivotally mounted on the shutter set plate. By operating integrally with the shutter set plate, the opening/closing lever is moved forward to release the exposed blade, but when the electromagnetic device is activated after the appropriate exposure time has elapsed, the engagement with the opening/closing lever is released and the opening/closing lever is released. and a drive lever that enables the reverse movement of the lever to close the exposed blade, and the focus lever
When the AF set plate operates, once focusing is completed, the AF set plate is temporarily stopped by the start release lever, and then when the start release lever is operated in conjunction with the shutter release operation, the AF set plate is stopped. In the focus-lockable electric shutter, the iron piece lever operates to operate the drive lever in response to the operation of the electromagnetic device to release the engagement with the opening/closing lever; A hold release mechanism comprising a hold lever that releases the restraint when the start release lever is operated and applies a repulsion force from the electromagnet device to the iron piece lever.