JPS5815933Y2 - Denshiyatsuta Camera No.Release release hand - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a release locking device for an electronic shutter camera that temporarily locks the shirt release operation during slow exposure to warn of camera shake, and allows the shirt release to be performed by the second release operation.

In general, when taking photographs, the negative effects of camera shake become a particular problem during so-called slow exposure, where the exposure time is long.

Conventionally, therefore, a lever that is displaced when the subject reaches the slow exposure time is provided, thereby locking the shirt release lever.

However, in this case, the release lever is completely locked, making it impossible to take pictures.

For this reason, in recent years, electronic shutter cameras have started displaying camera shake warnings such as automatically lighting up a warning rank when taking slow exposure shots. Consideration has been taken to reduce the negative effects of camera shake during slow exposure.

However, in reality, even if a camera shake warning is displayed by lighting up a lamp, etc., the warning is displayed during the shirt release operation, so it is difficult to pay attention to camera shake after checking this display. - There is a problem that the release operation may be performed carelessly, and the display for warning of camera shake is not sufficiently effective.

This idea was made in view of this problem. During slow exposure, the shirt taller release operation is temporarily locked, and then the shirt taller is released by releasing the pressure on the operation button slightly and then releasing the button again. To provide a release lock device for an electronic shutter camera, which enables the shutter release operation to be performed while being careful not to shake the camera during slow exposure.

An embodiment of this invention will be described below with reference to the drawings.

Reference numeral 1 in the figure indicates a shirt release member, ie, a shirt release lever, of an electronic shutter camera.

This release lever 1 has its upper end connected to the camera's shutter button (
(not shown), is provided to be movable up and down, is biased upward by a spring 2, and has horizontal arms 1a and 1b protruding from the side edges of the upper end and the center.

Further, a locking mechanism is provided for locking the shirt release lever 1 from a shirt release operation exceeding a fixed amount.

That is, there is provided a support lever 3 whose one end is rotatably supported and whose free end is extended horizontally and positioned below the arm 1a of the release lever 1. It is rotationally biased in the direction of arm 1a.

The support lever 3 has a shaft 5 erected at its free end, and has a vertically long long hole 6 in its center, and a pin 1 fixed to the camera body is inserted into this long hole 6. 7 restricts its rotation range.

The base end of a long lever 8 and the center part of a lock release lever 9 are rotatably supported on the shaft 5, and both levers 8.9 are integrally formed by a deployment spring 10 wound around the shaft 5. .

The lock release lever 9 has an engagement claw 9a protruding from the side edge of its central portion engaged with the upper part of the arm 1b of the chanter release lever 1, and is connected to the support lever 3 via the shaft 5. The engaging pawl 9a is elastically biased against the arm 1b by a deployment spring 11 provided as a bridge.

Further, the long lever 8 has its upper end close to the lower edge of the arm 1a of the shirt release lever 1.

Below the lock release lever 9, a detection lever 12 is rotatably provided with its central portion pivoted on a pin 13 fixed to the camera body.

This detection L/bar 12 has an upper end side edge connected to a deployment spring 14 which is bridged between it and the camera body via a pin 13.
The lock release lever 9 comes into contact with the lower end side edge of the lock release lever 9, and the release lever 9 is prevented from being rotated by the deployment spring 11.

Below the detection lever 12, there is provided a sector closing lever 15 which is rotatably supported in the center and has an engaging piece 15a protruding from the side edge of one end thereof.

This lever 15 is provided with a pin 16 at one end for stopping the rotation of the detection lever 12 by the spring 14, and protrusions 21a, 21b on both sides of the other end 15b.
Since the pin 16 is provided with the expansion spring 11 which is bridged between the camera body and the camera body via the pivot shaft, the pin 16 is
is biased in a direction away from the detection lever 12.

Further, the central portion is rotatably supported, one end is brought into contact with the engagement piece 15a of the sector closing lever 15 in opposition to the biasing force of the deployment suffling 11, and the other end is of the shirt taller release lever 1. A center lever 18 is provided close to the lower end and positioned on the trajectory thereof.

This lever 18 is rotatably biased by a deployment spring 19 which is bridged between the lever 18 and the camera body via its pivot shaft so that one end thereof is still elastically in contact with the engagement piece 15a.

Further, a control lever 20 is provided, which has a substantially U-shape and is rotatably supported in the center.

The relationship between the control lever 20 and the sector closing lever 15 is such that, under normal conditions, the other end 15b of the closing lever 15 and the protrusion 21b are fitted into the recess of the control lever 20, and the closing lever 15 is moved in the biasing direction of the spring 1T. When rotated to
The control lever 20 is rotated by pressing the inner edge of one of the recesses with the protrusion 21b, and when the protrusion 21b comes to be removed from the inner edge, the other protrusion 21a is pushed inside the other recess of the control lever 20. Press the edge to release the control lever 2
0 is returned to its original position.

Also. An electromagnetic coil M having a protruding iron core 22 that contacts the outer edge of one end of the control lever 20 is provided near the control lever 20 .

Excitation and de-excitation of the electromagnetic coil M are controlled by a switching circuit of an electronic shunter circuit inside the camera body.The electronic shutter circuit will be explained below with reference to FIG. 8. A series circuit of element CdS, capacitor C, and resistor R is connected to the resistor R side via a normally open switch S1.

Further, a switching circuit S that responds to the terminal voltage of the capacitor C is connected.

The electromagnetic coil M is connected to the connection terminal side of the photoelectric conversion element CdS of the power source E via the switching circuit S.

Further, a normally open switch S2 is connected to the resistor R, and a normally closed switch S3 is connected to the capacitor C in parallel.

The switches S□ and S2 respond to the shunter release lever 1, and their respective timings are such that as the release lever moves in the direction against the spring 2, the normally open switch S□ is first closed. Alternatively, the normally open switch S2 is then closed.

The normally closed switch S3 is set to open when the sector is opened.

Next, the operation in this embodiment will be explained.

First, when you press the shank operation button (not shown),
In conjunction with the button, the shirt release lever 1 is pushed down against the spring 2.

Then, the movement of this lever 1 closes the normally open switch S1.

Therefore, the photoelectric conversion element CdS and the resistor R
is connected in series to the power source E, so the photoelectric conversion element C
A voltage divided by dS and the resistor R is applied to the switching circuit S.

This divided voltage changes depending on the resistance value of the photoelectric conversion element CdS, that is, the amount of light incident on the element CdS,
When the amount of incident light is greater than the slow speed level, the switching circuit S maintains an OFF state and the electromagnetic coil M is maintained in a non-excited state.

In this state, when the shank operation button is further pressed and the shirt release lever is pushed down, the center lever 18 rotates against its deployment spring 19, as shown in FIG. Disengage the sector closing lever 15.

Then, the sector closing lever 15 rotates as shown in FIG. It is rotated in the direction of the arrow by the biasing force of the deployment spring 14 in conjunction with this.

At this time, the lock release lever 9 is rotated at the upper end of the detection lever 12 against its deployment spring 11.

However, the lock release lever 9 is
8 and a spring 10, the lock lever 8 is also rotated at the same time and is removed from the trajectory of the arm 1a of the shirt release lever 1.

Then, as shown in FIG. 3, when the shirt release lever 1 is further pushed down, the normally open switch S2 is closed, and the normally closed switch S3 is opened as the sector is opened, and the photoelectric conversion element CdS and the capacitor C becomes an integrating circuit connected in series to the power supply E, and an electronic shunter circuit comes into operation.

On the other hand, if the amount of incident light to the photoelectric conversion element CdS when the shirt release lever 1 is pressed down until the switch S1 is closed is less than the slow speed level, the switching circuit connects the photoelectric conversion element CdS and the resistor. R
It is turned on by the voltage divided by , and the electromagnetic coil M is excited.

Therefore, in this state, one end of the control lever 20 is attracted to the iron core 22 of the electromagnetic coil M, so that the control lever 20 is attached to the sector 1/m chain lever 15 at one inner edge of its recess. The rotation by the spring 11 is locked.

Then, the shirt release lever 1 is further pushed down, and the center lever 18 is rotated by this lever 1 against its spring 19 to release the engagement with the sector closing lever 15.

The sector closing lever 15 does not rotate, and therefore the detection lever 12 and the lock release lever 9 are held with their rotations locked by the sector closing lever 15.

However, when the shirt release lever 1 is pushed down further, the long lever 8 is moved by the arm 1a.
The support lever 3 is rotated against the spring 4 and pushed down together with the lock release lever 9.

When the lower end of the release lever 9 comes off the upper end of the detection lever 12, the lock release lever 9 is rotated by the biasing force of the deployment spring 11, as shown in FIG.

When the upper end edge of the long hole 6 of the support lever 3 comes into contact with the pin 7 and its rotation is restricted,
Since the arm 1a of the shirt release lever 1 is in contact with the upper end of the long lever 8, it cannot be pushed down further.

That is, the shirt release lever 1 is locked from shirt release operation beyond a certain amount, but at this time,
The lock lever 8 follows the lock release lever 9 by a spring 10, and the shirt release lever 1
The release operation of the camera is biased in rotation to unlock the release operation, and the locking function is potentially lost.

Therefore, when the biasing force of the operation button is slightly released, the long lever 8 is rotated to the position of the lock release lever 9 due to the biasing force of the spring 10, and in other words, the locking function for the shirt release lever 1 is lost. to prevent the release operation from locking.

Therefore, as shown in FIG. 7, if the shirt release operation is performed successively, the switch 52S3 is closed and opened, respectively, and a predetermined shirt release operation can be performed.

After the shirt release operation is completed, if the pressure on the operation button is released, the release lever 1 is returned to its original position by the return force of the spring 2, but at this time, the arm 1
b press the engagement claw 9a of the lock release lever 9 from below to rotate the lever 9 and release the lock lever 8 together with the first lock lever 9.
Return it to the state shown in the figure.

According to this embodiment, when the shank operation button is pressed and the shank release lever 1 is slightly moved in the shirt release operation direction, the switch S1 of the electronic shunter circuit is closed and the electromagnetic coil M is energized or de-energized. It is selected depending on the brightness at the time of shooting, and if the light is darker than a preset slow speed level, the electromagnetic coil M is excited to lock the shirt release operation above a certain amount of the lever 1 to warn of camera shake. At the same time, the lock release lever 9 is made to deviate from the trajectory of the shirt release operation of the release lever 1, and the locking mechanism of the long lever 8, which is elastically integrated with the release lever 9, with respect to the release lever 1 is potentially locked. The lock lever 8 follows the lock release lever 9 and deviates from the locus of the release operation relative to the release lever 1 when the shirt release operation is performed again after the activation of the operation button is slightly released. In this way, the so-called loss of the lock function is made obvious and the release operation is not locked, so in the case of slow-speed shooting, there is no disadvantage of causing negative effects due to camera shake due to careless release operation, and once Slow-speed photography can be easily performed by simply performing the locked release operation one after another after slightly releasing the pressure on the operation button.

As described in detail above, the present invention includes a shirt release lever, a detection lever that rotates in accordance with the pressing operation of the shirt release lever, and a detection lever that detects the above-mentioned information when there is a noise between subjects that corresponds to a slow exposure time. An electronic shutter camera having an electromagnet for restraining the movement of the lever, comprising: a support lever that is biased by a spring in a direction opposite to the direction in which the shirt release lever is pressed and is held movably against the spring force; a lock lever that is pivotally supported by the support lever and comes into contact with the arm of the shirt release lever when the shirt release lever is pressed;
A lock release lever that is pivoted in a spring-biased state on the support lever, contacts the detection lever when the support lever is at rest, and releases this contact and moves when the support lever is in the moving position; A spring member that elastically integrates the release lever; an arm that is provided on the release lever and that presses the lock release lever to move it back when the release lever moves back; and an arm that prevents the movement of the support lever. A regulating member is provided to stop the release rod in the middle of being pressed down.

Therefore, we have developed a release lock device for electronic shutter cameras that can temporarily lock the shirt release operation during slow exposure, and then perform the shirt release operation again while being careful not to shake the camera. It is something that can be provided.

[Brief explanation of drawings]

1 and 1 are front views showing one embodiment of this invention, and FIG. 8 is an electronic shunter circuit diagram of the same embodiment. 1...Chanta release lever 8...
・Lock lever 9...Lock release lever, 12
...Detection lever, 15...Sector closing v bar, 18...St lever 20...
... Control lever, M ... Electromagnetic coil, S ...
...Switching circuit, CdS...Photoelectric conversion element.

Claims (1)

[Scope of Claim for Utility Model Registration] A shirt release lever 1, a detection lever 12 that rotates in response to the pressing operation of the shirt release lever, and the above-mentioned detection when there is a lightness between subjects that corresponds to a slow exposure time. In an electronic shutter camera having an electromagnet M for restraining movement of the lever, the support lever 3 is biased by a spring in a direction opposite to the pressing direction of the shirt release lever and is held movably against the spring force; a lock lever 8 which is pivotally supported by a support lever and comes into contact with the arm 1a of the shirt release lever when the shirt release lever is pressed down; a lock release lever 9 that comes into contact with the lever and moves out of this contact when the support lever moves; a spring member 10 that elastically integrates the lock lever and the lock release lever; and a spring member 10 provided on the release lever. an arm 1b which presses the lock release lever and causes it to move back when the release lever moves back; and a regulating member 6 which stops the movement of the support lever while the release lever is being pressed down. A release lock device for an electronic shutter camera characterized by having γ and γ.