JPH0125944Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a so-called flash automatic device in which an aperture setting member is linked to the operation of a lens focusing operation member.

In addition to the above-described flash-matic device, the sensitivity of the film and the value of the guide number must also be set in advance, and the aperture must be set to a value corresponding to these values.

Conventionally, the setting of values other than the focused distance was related to the aperture, but the position of the control lever that transmits the focused value to the aperture setting member was changed depending on the film sensitivity and guide number value. Many methods were used to shift focus information by shifting the control lever, and relatively speaking, many methods were used that were similar to shifting the cam that conveys focus information to the control lever. With this method, the effect of switching the sensitivity is large when the focused distance is close,
On the other hand, if the distance is far away, the parts may be small, the dimensional accuracy of the parts must be high, or there are many parts that consist of cams, which require a lot of space. There were some inconveniences such as

In view of the above, the present invention provides a flash-matic device which is constructed with an extremely simple structure and the minimum number of cam parts necessary, and which enables accurate control.

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

In FIG. 1, 1 forms an aperture 1a centered at position 0. A shutter base plate 2 is pivotally connected to the shutter base plate 1 by a shaft 3, and is given right-handling by a spring 4. 2a, and an arm 2b, which is movable up and down along this axis 3, and when the diaphragm pin 5, which will be described later, is disengaged from the arm 2b when raised by a flash automatic release operation. lever,
5 is brought into pressure contact with the above-mentioned arm 2b by a spring 6, and operates between the position 5a of the aperture with the largest aperture and the position 5b of the aperture with the smallest aperture, and by this operation, an aperture opening/closing mechanism (not shown) is activated. The aperture pin 7 described above as an aperture setting member for operating the shutter is pivotally connected to the shutter base plate 1 by a shaft 8, is given levorotation by a spring 9, and is planted on the back side in the state shown in the drawing. Sensitivity detection pin 7a,
A film sensitivity lever 10 has a fulcrum pin 7b which is similarly set up on the front side, and 10 is an aperture lever 1a.
It has a sensitivity cam 10a which is combined with the shutter base plate 1 so as to be rotatable around the shutter base plate 1, and which suppresses the levorotation of the film sensitivity lever 7 by engaging with its sensitivity detection pin 7a,
The rotation described above is caused by setting the guide number, film sensitivity, etc. When loading a high-sensitivity film, etc., it is in the state shown in the figure, and when loading a low-sensitivity film, etc., it rotates to the right according to the value. The film sensitivity setting ring 11 that can be rotated is similar to the film sensitivity setting ring 10 described above.
The above-mentioned focusing ring 12 is combined with the shutter base plate 1, has a focusing information cam 11a, and is rotated around the aperture 1a by a focusing operation. A detent pin 14 is fixed to the front side of the end of the mounting plate 13 which extends above the sensitivity cam 10a of the film sensitivity setting ring 10, the end of which is fixed to the film sensitivity setting ring 10. A focus arm 14e with a focus detection pin 14a that engages with the focus information cam 11a of the camera, a cam groove 14b that is pin-slot connected to the fulcrum pin 7b of the film sensitivity lever 7, and an aperture lever 2.
The aperture arm 14c engages with the pin 2a of
4b, and due to the right rotation by the spring 4 of the aperture lever 2, the arm 14c is pushed by the pin 2a, giving it levorotation with the fulcrum pin 7b as the fulcrum, and this is applied to the focus detection pin 14a. _L1 is the distance from the center of the fulcrum pin 7b to the center of the pin 2a, and _L2 is the distance from the center of the fulcrum pin 7c to the center of the pin 14a. be.

Next, I will explain the operation.

In FIG. 1, as described above, the focusing ring 11 is in a state where the focus is set at the farthest distance within the usable flash range, that is, a state in which the focusing ring 11 is set at the most clockwise position within the above range. It is shown. The distance value is determined by the flash guide number, film sensitivity, etc., but as mentioned above, Figure 1 shows the state where the film sensitivity etc. are set to the highest value. The possible distance can also be set to the maximum distance, and FIG. 1 shows a state in which the focusing ring 11 is also set to this maximum distance. Note that the focusing ring 11 can focus even further away from this state, and can therefore rotate further to the right, but the aperture pin 5 is at the position 5a that maximizes the aperture diameter. Therefore, even if the focusing operation is performed beyond the controllable range in this way, the flash automatic operation cannot be performed.

When the focusing ring 11 is turned left from the state shown in FIG. 1, the focus is set at a short distance, and the focus detection pin 14a of the focus arm 14e is pushed by the focus information cam 11a, which is a focus information member. is forced to move a predetermined amount,
The control lever 14 rotates clockwise around the fulcrum pin 7b, and the aperture arm controls the clockwise rotation amount of the aperture lever 2 to move the aperture pin 5 from position 5a to position 5b to set the aperture. This focusing ring 1
1 rotates to the left and the range where proper exposure can be obtained is angle θ ₁
The focusing ring 11 can be further rotated to the left by an angle θ ₄ from this point, but at such a close distance, the amount of light becomes too large, resulting in overexposure even with the minimum aperture diameter, making it impossible to obtain proper exposure.

When the film sensitivity and guide number are set to high values, the focus detection pin 14 of the control lever 14
a is as described above, and the focusing ring 11
The control lever 14 is actuated within a distance R _{1 to R 3} from the center position 0 of the aperture 1a by actuation of the angle θ 1 of the arm 14.
c, the aperture pin 5 is operated between positions 5a and 5b, but when the guide number and film sensitivity are set to low values, the tension control lever 14 operates the aperture pin 5 between positions 5a and 5b.

The film sensitivity and guide number are both set by rotating the film sensitivity setting ring 10. That is, a ring (not shown) is provided with an index and a guide number scale, and this guide number scale is aligned with another fixed index, and the film sensitivity setting ring 10 is provided with a guide number scale corresponding to the index provided on this ring. All you have to do is adjust the film sensitivity scale.

When the film sensitivity setting ring 10 is turned to the right from the state shown in FIG. 1, the sensitivity detection pin 7a is pushed by the sensitivity cam 10a, and the film sensitivity lever 7 is turned to the right.
Move the fulcrum pin 7b to the right. At this time, the control lever 14 is connected to the locking pin 12 and the holding groove 14d.
Since it is pin-slot connected, there is no movement left or right.

As described above, when the film sensitivity etc. are set to the lowest value, the farthest distance at which proper exposure can be obtained is shorter than when set at high sensitivity. Therefore, the aperture pin 5 must be set at position 5a when focusing at a distance closer than the distance set with high sensitivity. For this purpose, when the film sensitivity lever 7 is rotated to the right from the state shown in FIG. Move the focus detection pin 14a to the _R2 position.

When the focusing ring is rotated to the right by an angle θ ₂ from the state shown in FIG. It contacts the cam 11a. Thereafter, the focusing ring 11 rotates to the right by an angle θ ₃ to focus at the closest distance allowed by the lens, and moves the focus detection pin 14a from position 0 to a position at a distance R ₄ .

When the focus detection pin 14a is set to low sensitivity as described above, it only detects the displacement of the focus information cam 11a while the focus ring 11 rotates at an angle θ ₃ , that is, only during the distance R ₂ to _{R 3} . However, this operation is smaller than the distance R ₁ to _{R 3} which is the amount of operation of the focus detection pin 14a when the focus detection pin 14a is set to high sensitivity. Even in this case, the aperture pin 5 must be operated at positions 5a to 5b. The movement of the fulcrum pin 7b allows the aperture pin 5 to operate as described above even when the sensitivity is set to low. That is, as described above, by moving the fulcrum pin 7b to the right from the state shown in FIG. 1, the distance _L2 from the fulcrum pin 7b to the focus detection pin 14a becomes shorter, and conversely
The distance _L1 to a becomes longer. Therefore, since the ratio of the lengths of the focus arm and the aperture arm of the control lever 14 from the fulcrum is changed in this way, even if the operating amount of the focus detection pin 14a changes depending on the set sensitivity, The amount of movement of the arm 14c is always kept constant and accurate control is performed.

As in the first embodiment explained in FIG. 1, the present invention rotates the film sensitivity setting ring 10 around the aperture 1a in accordance with the sensitivity value of the loaded film, such as the ASA sensitivity. By changing the cam 10a and changing the position of the fulcrum of rotation of the control lever 14, the ratio of the distances L ₁ and L ₂ from the center of operation to the activation side and end side of the operation, respectively, is changed. Therefore, the focusing ring 1 changes according to the distance range in which proper exposure can be obtained, which changes by changing the film sensitivity.
The first embodiment shown in FIG. 1 has a focus information cam 11a attached to the focus ring 11. This focus information cam 1 is formed on the control lever 14.
A focus detection pin 14a associated with the control lever 1a is installed, but a cam portion may be formed on the control lever, and a pin may be installed on the focusing ring.

Hereinafter, with reference to FIG. 2, the explanation of the second embodiment, which is different from the first embodiment shown in FIG. 1 in the above points, will not be repeated with the explanation of the first embodiment. I will explain it like this.

In FIG. 2, a focus information pin 21a is mounted on the focus ring 21 facing downward, that is, toward the back side of the drawing, and a focus detection cam 24a that engages with the focus information pin 21a is formed on the control lever 24. ing. The above-mentioned focusing ring 21 focuses on a close distance in the illustrated state, and unlike the focusing ring 11 in the first embodiment, it gradually focuses on a far distance by turning it to the right.
The control lever 24 has other parts common to the control lever 14 in the first embodiment.

In the case of the second embodiment, the focus information pin 21a, which is the activation side of the control lever 24, rotates around position 0, which is the center of the aperture 1a, as a fulcrum, so that the focus information pin 21a and the fulcrum pin 7b Compared to the interval L ₂ in the first embodiment, the value of the interval L ₂ ' changes each time the focusing operation is performed, so although it appears to be completely different, it is essentially Needless to say, this is common to both.

In the first and second embodiments described above, in order to release the flashing mechanism, the switching mechanism (not shown) is operated to raise the lever 2 along its axis 3, and then the arm 2b and the aperture pin 5 are disengaged. This breaks the link between the focusing operation and the aperture aperture, and conversely, the aperture aperture is set by an aperture setting member (not shown).

Furthermore, in the first and second embodiments, the aperture setting member explained as the aperture pin 5 does not simply set the aperture diameter through this operation;
The shutter speed may also be controlled at the same time, thereby controlling the exposure in a single program during normal photography. In this case, when the flash is activated, the aperture pin 5 is always biased at position 5b, moved toward position 5a by the shutter opening/closing mechanism, and restrained by arm 2b. This is done in such a way that it is then returned to position 5a. in this case,
The time from when the aperture pin 5 starts moving from the position 5a until it returns is constant regardless of the focused distance or the set sensitivity, that is, regardless of the position of the arm 2b.

According to the present invention, as described above, the value of the aperture aperture set in conjunction with the focusing operation is adjusted to the operating amount and operating range that can obtain the appropriate exposure amount of the focusing ring activated by the focusing operation. There is an effect that the aperture aperture can be controlled appropriately within the range of the operating amount as it changes depending on the value of the film sensitivity.

According to the present invention, the position of the fulcrum of the control lever is adjusted in order to change the aperture diameter in response to changes in the operating range in which the flash can be used, which varies depending on the film sensitivity of the focusing ring. The configuration is extremely simple, as all you need to do is change the film sensitivity setting.
This has the effect of providing an accurate and durable shutter at low cost.

[Brief explanation of the drawing]

FIG. 1 is a front view of main parts showing a first embodiment of the present invention, and FIG. 2 is a front view of main parts showing a second embodiment of the invention. 1...Shutter base plate, 1a...Aperture 1a, 0...Center position of aperture 1a, 2...Aperture lever, 5...Aperture pin, 5a...
...Position of aperture pin 5 at maximum aperture, 5b...Position of aperture pin 5 at minimum aperture, 7...Film sensitivity lever, 7a...Sensitivity detection pin, 7b...Fully pin, 10...Film sensitivity setting Ring, 10a...
... Sensitivity cam, 11 ... Focusing ring, 11
a... Focus information cam, 12... Rotating pin,
14...Control lever, 14a...Focus detection pin, 14b...Cam groove, 14c...Arm, 1
4d...Holding groove, 21...Focusing ring, 21a...Focus information pin, 24...Control lever, 24a...Focus detection cam.

Claims (1)

[Scope of claim for utility model registration] A focus information member with a cam that operates in conjunction with the focusing operation, an aperture lever that sets the aperture aperture from the maximum aperture to the minimum aperture, and that operates in conjunction with the film sensitivity setting operation. It has a fulcrum pin that can be moved to a predetermined position corresponding to the film sensitivity, and a cam groove that allows a movable contact point with the fulcrum pin, and is pivotally supported by the fulcrum pin at the contact point. a focusing arm that engages with the focus information member and rotates to a predetermined position as the focus information member operates; and a diaphragm that engages with the aperture lever and moves with the rotation of the focus arm to regulate the position of the aperture lever. The fulcrum pin, which moves in conjunction with the film sensitivity setting operation, pushes the cam edge at the point of contact with the cam groove, thereby causing the focus arm of the control lever to engage with the cam of the focus information member. By changing the contactable area, the amount of rotational movement of the focus arm is correlated to the film sensitivity, and the fulcrum pin moves the point of contact with the cam groove, and the length from the fulcrum pin to the focus arm and aperture arm is changed. change the ratio of
The amount of movement of the aperture arm accompanying the rotation of the focus arm is always constant, regardless of changes in film sensitivity.
A flash automatic device characterized in that the position of an aperture lever is regulated to an exposed position corresponding to the operation of a focus information member.