JPS6154209B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention provides the following features:
Even after activating the AF mechanism and setting the shooting lens, it is possible to reset the shooting lens (AF resetting) as long as the shutter charge lever as a shutter charge member is not released (before the shutter starts). This invention relates to an improved autofocus camera.

Some autofocus cameras are equipped with an autofocus device, commonly referred to as an AF mechanism, that is configured to perform autofocus operation depending on the subject appearing in the center of the viewfinder field of view. There are focus-type cameras, but in this type of camera, the exposure operation is performed immediately after the AF mechanism has finished operating, so the center of the viewfinder field of view is set after the autofocus operation. Since it is not possible to move the position of a subject that appears in a certain area, a uniform composition tends to be taken, which is an unavoidable inconvenience or drawback that the composition tends to be unsatisfactory from a photographic point of view.

In view of the above-mentioned inconveniences and shortcomings, the present invention is designed to repeat only the automatic focusing operation (hereinafter referred to as AF operation) several times so that it can be performed independently, and at the same time, when the AF operation ends. ,
In addition, the state before the shutter starts can be maintained for a long period of time, so that the position of the subject appearing in the center of the viewfinder field of view can be moved within the viewfinder field of view, and changes in the photographic composition can be measured. This invention has made it possible to provide an autofocus camera that not only performs the same operation as desired, but also confirms the AF operation, prevents distance measurement errors, and allows changing the subject. This will be explained in detail using examples.

First, in Figure 1, which shows the state of the main mechanism parts (including the AF charge ring and shutter charge lever) when charging is completed, 1 is the release lever, 2 is the AF charge ring, and 3 is the charge ring 2. Charge lever for AF, 4 is the charge position holding lever for charge ring 2,
5 is an interlocking lever with the charge ring 2; 6 is a ring for setting the correct position of the photographic lens in the member for setting the correct position of the photographic lens for setting the photographic lens in the correct position; They are coaxially provided, and 7 is a solenoid, 8 is a pawl for holding the set position of the ring 6,
10 is a shutter charge lever as a shutter charge member, and 11 is a hook for holding the charge position of the shutter charge lever 10.

The release lever 1 is guided by a slit and a guide pin like a normal release lever so that it can move up and down.
The release lever 1 is normally engaged with the rear end 4a of the charge position holding lever 4, which is swingable about the pivot shaft. AF starting protrusion 1a and a protrusion 1b for engagement with the rear end portion 11b of the charge position holding hook 11 of the shutter charge lever 10.

The AF charge ring 2 has a pin 2a for engaging with the AF charge lever 3, which is guided in the same manner as conventional charge levers and biased in one direction, and a claw 4b of the charge position holding lever 4. One side edge of the engaging claw 2b receives the engaging protrusion 6c of the ring 6 for setting the correct position of the photographic lens, while the other side edge receives the engaging protrusion 5c provided at the upper end of the interlocking lever 5. It is provided with a protrusion 2c used for abutment.

The interlocking lever 5 is swingably supported on a pivot shaft 5b, and the engaging protrusion 5c is connected to the charge ring 2.
In addition to the engagement protrusion 5c, the engagement protrusion 10a of the shutter charge lever 10 is biased by a spring 5d in the direction of collision with the protrusion 2c. The lower end of the interlocking lever 5 is provided with an engaging claw 5a, and the lower end of the interlocking lever 5 is connected to a spring force changing lever 9, which is supported so as to be swingable in a fan manner by a pivot shaft fixed to the camera body (not shown). One end is always engaged, and this lever 9
The other end is a second overstroke spring 1, which will be described later.
7 is constantly engaged with one end portion 17b of 7.
Note that the interlocking lever 5 and the second overstroke spring 17 can also be directly linked. A stopper is fixed to the 5e camera body.

The photographic lens alignment position setting ring 6, which moves the lens barrel forward or backward depending on the degree of rotation and sets the position of the photographic lens, has a biasing spring 6a that biases it in one direction, and a distance detection value. A large number of shields are provided in order to stop the rotation of the ring 6 itself by inserting a position holding pawl 8 which is moved forward and backward in accordance with the operation of the solenoid 7 which is activated by commands at different operation times based on the It includes a set position holding groove 6b and the above-mentioned engagement protrusion 6c.

Like the previous shutter charge lever,
The shutter charge lever 10, which is biased in one direction and movably guided by a slit and a guide pin, has a spring force changing projection with one end 16b of a first overstroke spring 16, which will be described later. A charge position holding hook 11 supported by the piece 10b and a pivot shaft in the center so as to be swingable in fan rotation.
It is provided with a protrusion 10a for engagement with a locking pawl 11a formed at the tip of the holder. That is, the engagement protrusion 1
The claw 5a of the interlocking lever 5 and the locking claw 11a of the charge position holding hook 11 engage with the hook 0a. Next, in FIG. 2 showing the main part of the film winding mechanism when charging is completed, reference numeral 12 moves the film winding shaft O integrally with a reciprocating film winding lever (not shown). A crank member that reciprocates around the center and is used to connect an AF charge mechanism (for example, the charge ring 2 in FIG. 1 or the charge lever 3 of the ring) and a shutter charge mechanism (for example, the shutter in FIG. 1) by a known appropriate method. They are configured to interlock with the charge lever 10) only in the forward direction.

The crank member 12 includes a pivot shaft 12a for pivotally supporting a hoisting pawl 14 (to be described later), a protrusion 12b forming a base thereof, and an engagement step that engages a pawl 15c of a safety lever 15 (to be described later). 12c is provided.

Reference numeral 13 denotes a so-called winding cam which is rotatably provided on the same axis as the crank member 12, and is linked to a film winding mechanism or a film feeding mechanism (both not shown) by a known appropriate method to wind a film by a known method. Like the take-up mechanism, it is configured to take up (or feed) the film by rotating in one direction.

In the periphery of the winding cam 13, several engaging claws 13a for engaging with winding claws 14, which will be described later, are provided at approximately equal intervals.

Thus, the winding pawl 14 is biased by the spring 14b installed between it and the crank member 12 in the direction of disengaging the pawl portion 14a from the engaging pawl 13a of the winding cam 13. As shown, one end 16b is the shutter charge lever 1.
The other end 16a of the first overstroke spring 16 is wound and supported on the pivot shaft 12a so as to be always engaged with the spring force changing protrusion 10b of the first overstroke spring 16.
is engaged, and biases the claw portion 14a in the direction of engagement with the engagement claw 13a. When the shutter charge lever 10 is in the state before charging (the state before film winding), that is, the shutter charge lever 10
When the spring force changing protrusion 10b is at the _x1 position, the claw portion 14a of the winding claw 14 is engaged with the engaging claw 13a of the winding cam 13, and the reciprocating crank member 12 moves in the forward direction during film winding. When the winding cam 13 is rotated, the spring 14b and the _first The overstroke spring 16 is adjusted.

In addition, the safety lever 15 is pivoted so as to be rotatable around a pivot shaft 15a established on the camera body side, and the claw portion 15c is cranked by a spring 15b installed between the safety lever 15 and the camera body. While the member 12 is biased in the direction of being released from the engaging step portion 12c, as described above, the one end portion 1
7b is always engaged with the lower end of the interlocking lever 5 at the other end of the spring force changing lever 9 (the direction of movement of the lever 9 shown in the first figure is different from the direction of movement of the lever 9 shown in the second figure). This is because the pivot shaft of the lever 9 is located at the center of the lever, and the one shown in the first diagram shows one end of the lever, and the one shown in the second diagram shows the other end. The other end 17a of the second overstroke spring 17 is wound around and supported on a shaft 15d established on the safety lever 15 so that the second overstroke spring 17 is always engaged with the safety lever 15.
is engaged, and urges the claw portion 15c in the direction of engagement with the engagement step portion 12c. The claw portion 15c of this safety lever 15
is in the state before shutter charging (state before film winding), that is, when the interlocking lever 5
The engaging protrusion 5c is the protrusion 2c of the charge ring 2.
As a result, the interlocking lever 5 is tilted as shown by the chain line in the figure, and the lever 9 and the other end 17b of the second overstroke spring 17 are connected via the lower end of the interlocking lever 5. When the engagement position is at the position _y1 , the spring 15b and the second overcoat are engaged with the engagement pawl 12c of the crank board 12, and are disengaged after completing the charge state in which the crank board ₁₂ is moved to the position y2. Stroke spring 1
7 has been adjusted.

Therefore, when the release lever 1 is pushed down after the charging is completed as shown in FIG.
Push down the rear end 4a of the charge position holding lever 4 to connect the claw 4b and the engagement claw 2 of the charge ring 2.
The engagement with b will be released.

Therefore, the charge ring 2 and the biasing spring 6
The photographing lens correct position setting ring 6, which is biased at point a and has an engaging protrusion 6c received on one side edge of the protrusion 2c of the charge ring 2, begins to rotate.

Thereafter, the position holding pawl 8 is advanced and fitted into the set position holding groove 6b of the ring 6 as the solenoid 7 is activated at different times based on the distance detection value of the distance measuring device. However, the rotation of the ring 6 is stopped and the photographing lens is kept in the correct position, but the charge ring 2 continues to rotate, and the other side edge of the protrusion 2c is brought into contact with the engagement protrusion of the interlocking lever 5. collide with the piece 5c, tilt the interlocking lever 5,
The claw 5a at the lower end is disengaged from the engagement protrusion 10a of the shutter charge lever 10, and the interlocking lever 5 is stopped when it reaches the position shown by the two-dot chain line in FIG. Rotation is also stopped. Then, the AF operation ends through the process up to this point.

At this time, the engagement position between the other end 17b of the second overstroke spring 17 and the other end of the spring force changing lever 9 is moved to the position _y2 as the interlocking lever 5 is tilted. Safety lever 15
The biasing force of the second overstroke spring 17 against the crank member 12 becomes weaker, and as a result, the claw portion 15c of the safety lever 15 is moved against the crank member 12 by the force of the spring 15b.
separated from the engagement step 12c in the
The safety lever 15 is rotated about the pivot shaft 15a to the position shown by the chain line in FIG. That is, the reciprocating crank member 12 is in a state where it can rotate. However, since the shutter charge lever 10 is still in the state at the time of completion of charging, the pawl portion 14a of the winding pawl 14 is not engaged with the winding cam 13. Therefore, when a film winding operation is performed in this state, only the reciprocating crank member 12 rotates in the forward direction to charge the AF charge mechanism (the AF charge ring 2 and the AF charge lever 3 shown in FIG. 1). It turns out.

In other words, the AF charge mechanism is charged again while the film remains unwinded (feeded). At this time, the shutter charge mechanism is also in a state of being charged; however, since the shutter charge mechanism has completed charging at this point, the forward rotation of the reciprocating crank member 12 is limited to the forward direction of the shutter. As for the tertiary charge, it turned out to be an empty shot.

Furthermore, the release lever 1 is pressed down to engage the engagement protrusion 1b with the rear end 11b of the charge position holding hook 11, and the hook 11
If the locking claw 11a is separated from the engagement claw 10a by fan-rotating the shutter charge lever 10,
will run and the shutter will be turned off.

As the shutter charge lever 10 moves, the spring force changing protrusion 10b is moved to the _x1 position shown by the chain line in FIG.
The biasing force of the first overstroke spring 16 against the winding pawl 14 increases and becomes larger than the force of the spring 14b, and as a result, the claw portion 14 of the winding pawl 14
a is brought into engagement with any one of the engaging pawls 13a of the winding cam 13 by the action of the overstroke spring 16.

Therefore, when the film is wound in this state, the rotation of the reciprocating crank member 12 is transmitted to the winding cam 13 via the winding pawl 14, and the film is simultaneously charged to the shutter charge and AF charge mechanisms. Winding is performed,
The first photographing sequence is now completed, and the next photographing becomes possible. In other words, the required mechanical parts can be brought into a charged state as shown in FIGS. 1 and 2.

As is clear from the above description, the autofocus camera according to the present invention differs from conventional autofocus cameras of this type in which the shutter charge lever is moved at the final position of rotation of the charge ring. As shown, first, the ring 6 for setting the correct position of the photographic lens in the member for setting the correct position of the photographic lens is stopped, and then the rotation of the charge ring 2 is stopped by pressing the release lever 1, followed by a pressing operation. Since the shutter is turned off by running the shutter charge lever 10 as a charge member, the so-called AF operation is performed after the rotation of the ring 6 and the charge ring 2 is stopped and before the shutter charge lever 10 is moved. Since the state at the end of the operation can be maintained for a long time, it is possible to move the subject position within the viewfinder's field of view, which not only makes it possible to optimize the composition, but also to check the AF operation, In addition to preventing distance measurement errors, if you stop pressing the release lever 1 midway and stop shooting, you can return the release lever 1 to its original position and charge only the charge lever 3 again without turning off the shutter. By doing so, it is possible to bring the charge ring 2 and the ring 6 into a charging completed state, that is, to make it possible to reset the settings, thereby enhancing the performance of this type of autofocus camera.
This greatly improved its practicality.

[Brief explanation of the drawing]

The drawings show an embodiment of the autofocus camera according to the present invention, and FIG. 1 shows the main components of the autofocus camera according to the present invention (including the AF charge ring and shutter charge lever part).
Figure 2 is a diagram for explaining the state of the main parts of the film winding mechanism when charging is completed, and the dashed-double lines in each figure indicate the state of the main parts of the film winding mechanism after the charge is released. It shows the position of 1...Release lever, 1a...AF starting protrusion, 1b...engaging protrusion, 1c...spring,
2...Charge ring for AF, 2a...Engagement pin, 2b...Engagement claw, 2c...Protrusion, 3...
AF charge lever, 4...Lever for holding charge position of AF charge ring 2, 4a...Rear end, 4b...claw, 5...Interlocking lever, 5a...
Claw, 5b...Pivot shaft, 5c...Engagement protrusion, 5d
... Spring, 5e ... Stopper, 6 ... Ring for setting the proper position of the photographing lens, 6a ... Spring for urging,
6b... Concave groove for holding set position, 6c... Engagement protrusion, 7... Solenoid, 8... Claw for position holding, 9
...Spring force change lever, 10...Shutter charge lever, 10a...Engagement protrusion, 10b...
...Protruding piece for changing spring force, 11...Hook for holding the charge position of the shutter charge lever 10, 1
1a...Latching claw, 11b...Rear end portion, 12...Crank member, 12a...Pivot shaft, 12b...Protrusion, 12c...Engagement step, 13...Hoisting cam, 13a... Engagement claw, 14... Winding claw, 1
4a...Claw portion, 14b...Spring, 15...Safety lever, 15a...Pivot shaft, 15b...Spring, 15
c...Claw portion, 16...First overstroke spring, 17...Second overstroke spring, 16
a, 17a...other end, 16b, 17b...one end, _x1 , _x2 ...position of the spring force changing protrusion 10b of the shutter charge lever 10 after charging is released and at the time of charging completion, y ₁ , y ₂ ...The position of the other end of the spring force changing lever 9 after the charge is released and when the charge is completed.

Claims (1)

[Scope of Claims] 1. In an autofocus camera in which an AF mechanism is activated in response to a pressing operation of a release lever, and after the lens is set by the operation of this AF mechanism, the shutter is activated to perform an exposure operation. , The AF charge mechanism and the shutter charge mechanism are configured to be directly charged by a crank member that reciprocates during a reciprocating film winding operation, and a winding cam that interlocks with the film winding mechanism and the reciprocating crank member. Between,
A winding pawl mechanism is installed which has a clutch action itself and is capable of transmitting only the forward movement of the crank member to the winding cam, and furthermore, the winding pawl mechanism is actuated by the final movement of the forward movement of the shutter charge member. The mechanism is configured to release the clutch and re-engage the clutch by the backward movement of the shutter charge member. The engaging claw of the safety lever, which prevents the next charge movement of the reciprocating crank member, can be retracted to a position outside the range of motion of the crank member by the displacement action of the displaced member. Autofocus camera.