JPS587373Y2 - Aperture mechanism in single-lens reflex cameras - Google Patents

Description

[Detailed explanation of the invention] This invention is based on an eye-reflex camera that observes with the aperture open at all times during the observation state, and narrows the aperture to a preset aperture value when in the shooting state. This is a single-lens reflex camera that performs post-exposure, and it is possible to stop the aperture down to a preset aperture value in observation mode, and then open it again for previewing, depending on the photographer's intention. Regarding the aperture mechanism of a flex camera.

Conventionally known aperture mechanisms for this type of preview employ a push-button method. During observation, by pressing the push button, the open aperture is narrowed down to a preset aperture value, and then the above-mentioned Since the diaphragm was configured to be opened by pressing a button, the diaphragm mechanism had the disadvantage of becoming extremely complicated.

The purpose of this invention is to eliminate the above-mentioned drawbacks of the conventional technology.The iris stops narrowing down to the preset aperture value only while the manual iris operation member is pressed, and when the pressing operation is released, the iris opens reliably. By doing so,
The present invention relates to an aperture operating mechanism for a single-lens reflex camera that significantly simplifies the aperture mechanism and reduces the cost of this type of camera.

Describing one embodiment of the present invention in detail with reference to the drawings, a release lever 2 that is rotated counterclockwise by an interlocking member 1 in connection with a release operation includes a notch locking portion 2a and a protrusion 2b following the notch locking portion 2a. is formed.

The preset operating lever 3, which has a bent piece 3b that can be engaged with and disengaged from the notch locking portion 2a and comes into contact with the protrusion 2b when the engagement is disengaged, has three pins 3a, 3c, and 3.
d, and is rotatably pivoted to the camera body by a shaft 3e.

A return lever 4b rotatably pivoted to a shaft 4a has two bending pieces 4b and 4e, and is given a clockwise rotational habit by a return tension spring 11 stretched over the bending piece 4c. In addition, the spring 5 stretched between the pin 3a of the preset actuation lever 3 and the return lever 4 gives the pin 3c of the preset actuation lever 3 a habit of not coming into contact with the bent piece 4b of the return lever 4. has been done.

The charge lever 19 shown in broken lines has a pin 19a, and when the charge lever 19 moves to the left in connection with the charge operation, the pin 19a engages pin 3 of the preset actuating lever.
d to rotate the preset operating lever 3 clockwise, and its bent piece 3b is locked onto the notch locking portion 2a of the release lever 2, thereby charging it together with the shutter charge.

The pin 6 extending from the aperture device (not shown) of the interchangeable lens is an aperture link pin, and when this pin is in the O line position shown in FIGS. When the aperture is opened and moved to the left, for example at the position l of line b shown in FIGS. 2 and 4, the aperture is narrowed down by its own habit.

The preset lever 7, which has a bent piece 7a that is drawn to the left of the aperture interlocking pin 6 and engages with it, is pivotally connected to the shaft 4a, and is located between the preset lever T and the pin 3a of the preset operating lever 3. , a thick compression spring 8 is installed,
In the state shown in the first figure, the preset lever T is given a clockwise rotational behavior to the pressing device against the throttling behavior of the aperture device, and the aperture interlocking pin 6 is held at the aperture opening position on the O line.

A diaphragm slide plate 13 is integrally connected to a preview button 15 that can be manually pressed, and is slidable left and right with respect to the camera body by a pin 14, and is biased to the left by a spring 16, so that the preview button The pin 1.3a which gives the pin 15 a protruding habit and which is protruded from the narrowing sliding plate 13 is
It engages with the leading edge 12a of the narrowing lever 12.

This narrowing lever 12 is pivotally connected to a shaft 12c, and the side edge 12b of its narrow arm is the raised edge 7b of the preset lever 1.
is abuttingly engaged with.

Therefore, when the preview button 15 is pressed, the aperture slide plate 13 moves to the right, the aperture lever 12 is rotated clockwise, and the preset lever I is moved to the a line further to the left of the position where the aperture is narrowed down to the minimum aperture. The aperture linking pin 6 is rotated to the position (press release position), during which the aperture interlocking pin 6 is narrowed down to the b-line position of the preset aperture aperture.

The return lever 4 is rotated counterclockwise in conjunction with the winding operation by a known mechanism (not shown), and is locked by the hook portion 9a of the release lever 9 at the rotated position.

The release lever 9 is pivotally supported by a shaft 9c, and is supported by a spring 9.
The gear 1 is provided with a counterclockwise rotational habit by the handle, and the hook portion 9a is attached to the end of the arm and the gear 1 is linked to the rear curtain of the shutter.
A bent piece 9b is formed which can engage with the pin 10a implanted in the pin 10a.

The locking plate 1T, which is rotatably locked to the shaft 9c, has a locking step 17a and a notch 17c. The pin 18b of the locking auxiliary lever 18, which is biased by a spring, is fitted and engaged.

The bent piece 18c formed at the narrow arm end of the locking auxiliary lever 18 engages with the pin 19a and rotates clockwise when the charging lever 19 is operated for charging.

As configured as above, when the charge lever 19 is moved to the left by the hoisting operation, the locking auxiliary lever 1
8 is a locking plate 1 for the return lever 4 which is rotated clockwise.
The locking by the locking step 17a of 7 is released, and the return spring 11 is rotated counterclockwise while charging, and as shown in FIG. 1, the charging of the shutter is completed and the return lever 4 is bent. The piece 4c is locked to a hook portion 9a of the release lever 9.

At the same time, the pin 19a engages with the pin 3d and rotates the preset actuating lever 3 clockwise while accumulating the spring 5 and the aperture spring 8, and the bent piece 3b is placed on the notch locking portion 2a of the release lever 2. engage with.

In this state, the preset lever I is rotated clockwise by the stored aperture spring 8 at its terminal end (pressing position), and the aperture interlocking pin 6 is moved by the bent piece 7a.
When the shutter is fully charged as shown in Figure 1, and the aperture is at the O-line position and the aperture is open, the release is operated, first the release lever 2 rotates counterclockwise and its notch engages. The locking of the preset operating lever 30 at the clockwise rotation position by the stop portion 2a is released, and the preset operating lever 3 is rotated counterclockwise by the stored aperture spring 8 and spring 5, and the preset operating lever 7 is rotated counterclockwise.
After releasing the restraint at the 0 clockwise rotation position, the preset lever 1 rotates counterclockwise to the a-line position l, and the aperture interlocking pin 6 is preset, for example, to the b-line position! to the left, the aperture is set to the preset aperture value, and the front shutter curtain continues to run to start exposure. When the desired exposure time has elapsed, the rear shutter curtain also starts running and the exposure ends.

After the exposure is completed, the pin 10a of the gear 10 comes into contact with the bent piece 9b of the release lever 9 and rotates it clockwise.
The return lever 4 is unlocked by the hook 9a, and the return lever is rotated clockwise from the charge position by the return pull spring 11 to the rest position, and during the rotation stroke, the bent piece 4b engages with the pin 3c. makes contact with the throttle spring 8, and rotates clockwise together with the preset operating lever 3 while accumulating energy with the aperture spring 8, and pushes the preset lever 1 clockwise to return it to the O line position shown in FIG. 3, The aperture is opened again via the aperture interlocking pin 6.

The above describes the operation of the diaphragm in relation to the release operation.

Next, let's talk about the preview to observe the situation when the aperture is stopped down to the preset aperture value before exposure. First, as shown in Figure 1, when winding is completed and the shutter is charged. Specifically, when the aperture slide plate 13 is moved to the right by manually pressing the preview button 15 as described above, the aperture lever 12 rotates clockwise, and the side edge 12b of the preset lever 1 rotates. By pushing the raised edge 7c, as shown in FIG. 2, the preset lever 7 is rotated counterclockwise to the position a on line A while further accumulating the force in the aperture spring 8, as shown in FIG. , and moves to the left at the preset b-line position between them, resulting in the preset aperture.

After observation, when the preview button 15 is released, the stored aperture spring 8 returns the preset lever 7 to the O-line position and opens the aperture.

According to the present invention, a preview can be performed even before the winding operation shown in FIG. 3 is performed.

That is, when the shutter is released, the return lever 4
is rotated clockwise to the rest position, and its bent piece 4
c is locked by the locking step 1ra of the locking plate 1T, which is rotated clockwise by the locking auxiliary lever 18, which is rotated counterclockwise, so that rotation in the counterclockwise direction is prevented. is in a state of being

Therefore, although the engagement between the preset operating lever 3 and the release lever 2 is broken, the counterclockwise rotation of the preset operating lever 3 by the aperture spring 8 is caused by the pin 3c and the bending piece 4.
b, and the aperture spring 8 pushes the preset lever I clockwise in a stored state, stopping the aperture interlocking pin 6 at a position on the O line and opening the aperture.

In this state, press the preview button 15 as shown in Figure 4.
When pressed, the aperture sliding plate 13 moves the aperture lever 1
The aperture spring 8, which is energized by the preset lever I via 2.
, the aperture is further stored and rotated counterclockwise at the a-line position, while the aperture interlocking pin 6 moves to the left to the preset b-line position to narrow down the aperture. When the preview button 15 is released, the aperture spring 8 is set to 1.
．． The accumulated force rotates the preset lever 7 clockwise to its original position, and returns the aperture interlocking pin 6 to the aperture open position on the O line.

In this invention, the preset lever is actuated in a preset manner, and the bars are brought into elastic contact with each other by the aperture biasing member, and when the preview is set, the preset lever resists the aperture biasing member and moves to the aperture interlocking pin according to manual operation by the manual aperture mechanism. Since the preset operating lever is pushed to the position where the suppression is released, preview settings can be made even when the preset operating lever is locked, and preview settings can always be made regardless of whether before or after the shutter is charged.

Furthermore, since the aperture biasing member is provided between the preset lever and the preset operating lever, this aperture biasing member does not act on any member related to the aperture operation other than the two levers mentioned above during photographing, and the aperture There is no adverse effect on the closing or opening operation.

The force for charging the biasing member can be reduced, and the preset actuating lever and the preset lever can be accurately positioned at the first position and the suppression release position, respectively, via the return lever positioned by the third locking mechanism. .

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, in which FIG. 1 is a top view with the shutter charged, FIG. 2 is a top view showing a preview operation being performed with the shutter charged, and FIG. This figure is a top view showing a state in which the shutter is released, and FIG. 4 is a top view showing a state in which a preview operation is performed by pressing the button in the same state as above. 2... Release lever 13... Preset operating lever, 4... Return lever 6... Aperture interlocking pin, T...
・Preset lever, 8...Aperture biasing member, 9, 10
. . . first locking mechanism, 11 . . . return biasing member, 5.
...Biasing member, 1, 2...Second locking mechanism, IL13y
14t15.16...Manual narrowing mechanism, 17.18
...Third locking mechanism.

Claims (1)

[Scope of Claim for Utility Model Registration] In the aperture mechanism of a single-lens reflex camera equipped with a lens equipped with an aperture device button having an aperture mechanism and an aperture interlocking pin linked to the aperture device, the diaphragm mechanism between the charge position bag and the rest position is provided. a return lever that is supported to move and is urged to a rest position by a return urging member; and a return lever that is locked in a charging position against the urging of the return urging member in a shutter charging state. ,
a first locking mechanism that releases the lock after exposure is completed; a pressing position that presses the aperture interlocking pin to the aperture open position against the aperture tendency; and a press release that allows the aperture interlocking pin to move to the aperture opening position. The preset lever is supported to move between positions, and the aperture biasing member provided between the preset lever biases the preset lever into contact with each other. a first moving the preset lever to the pressing position via the aperture biasing member in a state where they are in contact with each other;
and a second position for pushing the preset lever to the depressing release position;
When the return lever is in the charge position, it is urged to the second position by a biasing member provided between the return lever and the return lever, and when the return lever moves to the rest position, the return lever a preset actuation lever that is pushed to a first position; and in a shutter charging state, the preset actuation lever is locked in the first position against the biasing force of the biasing member;
a ninth locking mechanism that releases the lock before starting exposure in response to a shutter release operation; and a ninth locking mechanism that moves the preset lever from the pressed position against the biasing force of the aperture biasing member in response to a manual operation. A single lens comprising: a manual aperture mechanism that is pushed to a release position; and a third locking mechanism that locks the return lever to the rest position after exposure and releases the lock when charging the shutter. Reflex camera aperture i configuration.