JPH0251168B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a camera equipped with an automatic focusing device.

A camera with a conventional autofocus device is
By setting the AF (automatic focus adjustment) setting plate, the spring that applies a repulsion force to the release type electromagnet and the iron piece is charged, but during normal shooting, the AF front running member runs first, and the AF determining member moves in the final area. AF is determined by releasing the locking lever that locks the camera, and when using the focus lock, run the AF determining member first and stop it once just before the release, then run the AF front traveling member at the time of release to determine AF. Since the method of releasing the members was used, there were a large number of actuating members, and the order of setting was very complicated, which resulted in the disadvantage of increasing the amount of setting force.

In view of the above-mentioned problems, the present invention charges a spring that applies a repelling force to the time-release type electromagnet and the iron piece when the AF set plate is set, and in the final region, the spring is connected to a locking member. By locking once, the separation force can be kept constant during normal shooting and focus lock shooting, simplifying the mechanism and reducing the number of parts, and preventing an increase in setting force. The purpose is to provide a camera equipped with an automatic focus adjustment device as described above, and this will be explained based on one embodiment shown below. 1 shows the arrangement of the side members, 1 is an exposed opening 1a and two slots 1b, 1
c and a bent portion 1d; 2, 2 is a pair of exposed blades pivotally mounted on the rear surface of the shutter plate 1 at approximately symmetrical positions 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 is hung between the shutter plate 1 and the bent portion 6a and acts as an opening force source and a closing force source for the opening/closing lever 3; 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 that imparts right-handed rotation to the sector gear of device 5;
Reference numeral 6 denotes a bent portion which is slidably movable in the left and right direction on the shutter plate 1, 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 a left-handed rotation behavior.

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 that makes 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; a delay governor 33, which is made of 34 is a focus ring which is rotatably arranged around the optical axis and has a pin 33a implanted therein which comes into contact with the protrusion 30g of the AF set plate 30, and a rack 33b on the outer periphery; The spring 35 that gives the ring 33 a right-handed rotational behavior is made up 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 so that the AF A latch mechanism 36 that latches the focus ring 33 when the distance is selected by a 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, which can be used, 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 6.

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 that is switched every 1/2 rotation of the disk, and E is a power source.

Since the camera according to the present invention is configured as described above, to describe normal shooting, when the shutter button is pressed, the first switch (not shown) is turned on, a warning display and battery detection are performed, and the state of the first stroke is set. If the power supply E is equal to or higher than the specified voltage, preparations are made for proceeding to the next state. Next, the second stroke (not shown) is entered and the second switch is turned on.
When this happens, the power supply E is latched by the power transistor, and at the same time, the time period during which the starting electromagnet 24 has a pulse (sufficient for the start-up of the coil of the starting electromagnet 24) is time) 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, the intermediate lever 19 rotates to the right against the spring 20 and hits the arm 16b of the start release lever 16 with its arm 19a, causing the start release lever 1 to
6 to the right in FIG. 3 against the spring 16'. Bent portion 16 of start release lever 16
c 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, AF plate lock lever 2
Since the hook portion 30a of the AF setting plate 30 is removed from the bent portion 25b of the AF setting plate 30, the AF setting plate 30 is moved rightward by the spring 31 while being acted on by the delay governor 32. At this time, the hold locking lever 15 is rotated counterclockwise in FIG.
Since a is removed, the hold lever 12 is held by the spring 14.
However, since the iron piece 9c of the closing control iron piece lever 9 is attracted and held by the closing control electromagnet 11, the arm part 1 of the hold lever 12
2c remains in contact with the arm portion of the iron piece lever 9, 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. In addition, since the hold lever 12 is prevented from turning clockwise, the charge spring locking lever 13 also does not turn clockwise. Therefore, the charge spring 23, once released by the rightward movement of the AF set plate 30, immediately rotates the locking lever 13. It is locked by the hook portion 13b and its spring force does not disappear. Next, the AF set plate 30
further moves to the right, and the focus ring 33 rotates to follow this movement to select a distance from near to ∞ or from ∞ to near. After this, the end surface 3 of the AF set plate 30
Since 0f 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, the bent portion 17a is removed from the hook portion 6b of the set plate 6. Now, the setting plate 6 begins to move to the right 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 is activated by the trigger switch.
Since it is separated from SW ₁ , trigger switch SW ₁ is
The light is turned OFF, and a light source suitable for the subject light begins to charge the time-setting 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 locking lever 13 also rotates to the right and its hook portion 13b disengages from the charge spring 23, and the unlatched charge spring 23 returns to the right direction in FIG. It is locked. On the other hand, when the closing control iron lever 9 is rotated to the left, its pin 9b pushes the arm 7b of the drive lever 7, so the drive lever 7 is rotated 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 from the middle, thereby completing the exposure. During long-term exposure, the opening/closing lever 3 operates the full stroke to maintain the fully open state (temporarily remains stopped), and when the closing control electromagnet 11 operates, the concave portion 7a of the drive lever 7 comes off from the bent portion 3e, causing the set plate to close. The edge is cut off from 6 and the drive lever 3
The set plate 6 rotates to the left, but the set plate 6 further moves to the right by the remaining stroke, returns to its 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.
When one end of 3 is released from the hook portion 13b of the charge spring 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 The starting electromagnet 24 is rotated to the right by 20 and returned to the set position, and the iron piece 22 is in a non-energized state (due to the magnetic force of the built-in permanent magnet).
It is adsorbed to. Now, as described above, when the set plate 6 moves to the right end in FIG.
Switch SW ₃ from terminal A to 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,
The AF set plate 30 is moved to the left in FIG. 3 while charging the AF set plate spring 31, and during this certain stroke, the protruding portion 30h pushes the bent portion 6d of the shutter set plate 6, so that the shutter set plate 6 also moves. Also, while charging the spring 4, it can be moved to the left in FIG. Furthermore, by moving the shutter set plate 6 to the left, the changeover switch _SW3 is changed from terminal B to A, but due to the rotation of the disk 36, the changeover switch _SW4 is changed to the terminal D in FIG.
Since the rotation is switched from to 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, and the hold lever 1
2 is rotated to the left, its force source, ie, spring 14, is charged. On the other hand, along with this, the iron piece lever 9
is rotated to the right by a spring 10, and the iron piece 9
c closes and contacts the control electromagnet 11 to maintain a close contact state. Also, at the same time, hold lever 1
The second hook portion 12a 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. In addition, the AF set plate 30 also has its hook portion 3.
0a is 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, one end of the charge spring 23 is pushed by the hook portion 30e and moves to the left.
The slope of the charge spring locking lever 13 is pushed to rotate it to the right, and the lever falls into the hook portion 13b, resulting in a charge state. At this time, the charge spring 23 is still attached to the hook portion 30e of the AF setting plate 30.
is engaged in. Therefore, start iron lever 2
1 is applied with a left turning force in FIG. In this way, the shutter setting is completed, but at this time the disk 36 has rotated 1/2, and at this point the switch _SW4 is switched from terminal C to D in FIG. 4, so the power supply to the motor M is cut off. At the same time, both ends are short-circuited and it suddenly stops. In the above operation,
Since the motor M is switched on in the final operating range of the set plate 6 (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.

Incidentally, instead of the changeover switch SW ₄ , a changeover switch consisting of a slider S and a conductor pattern P which are linked to a motor M as shown in FIG.
SW ₄ ′ 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 is removed 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 described above, in the camera according to the present invention, the AF setting plate charges the charge spring that applies a repelling force to the time-release type electromagnet and the iron piece when the AF setting plate is set, and in the final area, the charge spring is once set to the locking member. Since it is designed to be locked, the separation force can be kept constant during both normal shooting and focus lock shooting, which simplifies the mechanism and reduces the number of parts, while also preventing an increase in setting force. You can. Furthermore, since the switch for film winding and shutter setting is turned on in the final operating area of the setting plate when the opening/closing operation of the shutter has already been completed, there is no possibility of adverse effects on the exposure. It is possible to wind the film and set the shutter even when the shutter button is held down, and as a result, it has the advantage of being excellent in quick shooting performance.

[Brief explanation of drawings]

FIG. 1 is a front view showing an embodiment of the camera according to the present invention in a set state, FIG. 2 is a plan view of the above embodiment, FIG. 3 is a diagram showing the arrangement of components on the back side of the above embodiment, and FIG. This figure is an electric circuit diagram for film winding and shutter setting in the above embodiment, 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 AF set that is biased in one direction and operates when the lock is released, allowing the focus ring's follow-up circuit to enable focusing, and then driving the release lever to enable shutter opening/closing operations. plate, and a locking lever that locks the AF set plate, which operates when the restraint is released to release the lock of the AF set plate by the lock lever, and when restrained, drives the AF set plate with the release lever. The actuating force is applied to the start lever mechanism that is locked in the front and the start lever mechanism that is in a inhibited state when one end is engaged with the start lever mechanism and the other end is pressed by the setting operation of the AF setting plate. a focus lever that, when operated, releases the locking of the AF set plate by the locking lever; and a focus lever that releases the locking of the AF set plate by the locking lever, and the charge spring that replaces the AF set plate immediately after the AF set plate starts operating. A charge spring lock having a hook portion that prevents the other end from restoring and is operated to release the inhibition of the other end of the charge spring after the start lever mechanism is activated by the action of the charge spring. comprising a lever,
Camera with automatic focusing device.