JPS5813897B2 - density release camera - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electric shutter camera having an electromagnetic shutter release device in which a shutter release mechanism is actuated via an electromagnet that is energized by a shirt shutter release operation such as pressing a shutter button.

In a camera having an electromagnetic release device, when the power supply battery is exhausted to a certain extent, it becomes impossible to excite the electromagnet and the shutter becomes inoperable.

Therefore, the idea that it would be possible to operate the shutter by mechanical control even in such a case has arisen.

Various camera shutters have already been proposed that realize this idea.

For example, there is a model in which an electromagnet attracts and holds the shutter release member in conjunction with the push of the shutter button, and then releases the shutter. Since the electromagnetic release device is forced to be displaced by the shutter, it becomes difficult to operate, and the effect of the electromagnetic release device, which is easy to operate, is lost, the number of parts increases, the cost increases, and the structure becomes complicated.

The present invention aims to provide a camera having a mechanically controllable electromagnetic release device that eliminates these drawbacks.

The present invention includes a release activation member that is operated by excitation of an electromagnet that is energized in response to operation of a shutter button, and has no direct mechanical communication with the shutter button, and a first shutter that is operated by demagnetization of the electromagnet. an electric shutter control device having a trailing member engaging member;
A transmission member that enters between the shutter starter button and the release activation member by a manual switching operation to mechanically actuate the release activation member, and a transmission member that advances and retreats to a shutter trailing member locking position also by the manual switching operation. The present invention relates to an electromagnetic release camera equipped with a mechanical shutter control device having a second shutter trailing member locking member.

The present invention will be explained below with reference to Examples.

The figure shows an embodiment of the invention by means of a pocket camera.

1 is a shutter leading member, 2 is a shutter trailing member,
1a and 2a are locking projections provided on each shutter member, and 1b and 2b are exposure openings provided on both shutter members.

When both shutter members are released, they travel to the left.

The shaded parts in the figure are the parts of the mechanical shutter control device, and when operating as an electric shutter using an electromagnetic release device, they are in a retracted position different from this figure, so when considering operation as an electric shutter, these parts should be It can be assumed that there is no such thing.

First, a case will be described in which the shutter is operated as an electric shutter.

14 is a shirt starter button, and when this is pushed upward, switch S1 is closed.

S1 is in the position shown in the circuit of Figure 2. Before the shutter release, switch S2 is closed, transistor T1 is cut off, and T2 is conductive, so when S1 is closed, electromagnet 5 is energized. Excited.

When the electromagnet 5 is energized, the armature 7a provided at the left end of the release activation member 7 is attracted to the electromagnet 5, and the member 7 rotates clockwise around the fulcrum 7b, and the right end pawl is connected to the second gear shaft of the governor. The governor gear 4.4' is freed from engagement with the ratchet wheel 4', which is fixed to the drive wheel 4.4'.

4 has a pin 4a erected thereon, which is inserted into the cut groove 3 of the control member 3.
a, and the member 3 is pulled to the left by the spring 3b.

Then, when gears 4 and 4' become free, member 3 moves to gears 4 and 4.
Proceed to the left while rotating '.

Here, the right end of the lever 8 is engaged with the protrusion &1a provided at the left end of the shutter preceding member 1, and the left end of the lever 8 is pushed clockwise by the left end of the control member 3 moving leftward. The lever is rotated, and the engagement between the right end of the lever and the engagement protrusion 1a of the shutter leading member 1 is disengaged, and the shutter leading member 1 starts moving to the left.

At the start of this running, the protrusion i[fi3c on the right end of the member 3 hits one contact piece of the switch S2 and opens it.

In Figure 2, when S2 opens, charging of capacitor C starts, and when the charging voltage of C reaches a certain level after a predetermined period of time, T1 becomes conductive and T2 is cut off in a Schmitt circuit consisting of transistors T1 and T2. , the electromagnet 50 is de-energized.

Then, the armature 6a at the right end of the locking member 6 as the first shutter trailing member locking member that is engaged with the left end protrusion 2a of the shutter trailing member 2, which was previously attracted to the electromagnet 5, Since the member 6 is released, the member 6 is rotated counterclockwise using the left end as a fulcrum by the force of the spring, and the shutter trailing member 2 is rotated.
The shutter trailing member starts traveling to the left and the shutter closes.

Although the explanation was given later, the engaging member 6 is connected to the pressing lever 1.
2 pushes the armature 6a so as to connect it to the electromagnet 5, but when the control member 3 moves to the left by operating the shirt lever release, the lever 12 is rotated clockwise by its left end. When the lever 12 is moved, the lever 12 is separated from the locking member 6, and the locking member 6 remains in the locking position due to the attractive force generated by the excitation of the electromagnet 5.

In conjunction with operations such as winding the film or charging the shutter, the shutter members 1 and 2 and the control member 3 are returned to the right, and the lever 12 again presses the armature 6a of the locking member 6 against the electromagnet 5.

Next, the case of switching to mechanical shutter control will be explained.

10 is a switching operation member that is manually moved left and right.

When operating as an electric shutter, this member is in a retracted position to the left of the position in the figure.

When switching to mechanical control, move from the left position to the position shown in the figure.

Then, the transmission member 11 is pushed by this member and the spring 11
is pushed to the right against a, and the right end is the shirt button 1
4 and the release activation member 7.

The transmission member 11 has an elongated hole 11b in which a guide pin is fitted so as to be movable left and right.

Following the movement of the member 10 to the illustrated position, the locking member 9 as the second shutter trailing member locking member is pulled by the spring 9b and rotated counterclockwise about the fulcrum 9a, and the right end is rotated counterclockwise. The shutter trailing member 2 is moved to a position where the protrusion 2a is locked.

When the power supply battery is exhausted and mechanical control is used instead of electrical control, the electromagnet 5 will not be excited at all or sufficiently, so even if the shutter button 14 is pressed and the switch S1 is closed, the release activation member 7 will not be activated by the electromagnet. Not attracted to 5.

However, since the right end of the transmission member 11 is interposed between the shutter button 14 and the member 7, the upward push of the shutter button 14 is transmitted to the member 7 via the member 11, and the armature 7a is connected to the electromagnet 5. By being mechanically pressed, the right end of the member 7 disengages from the ratchet wheel 4' of the governor, the control member 3 moves to the left, and the shutter leading member is released, unlike in the case of electric control. It's the same.

When the member 3 moves to the left, the lever 12 is rotated counterclockwise and the locking member 6 is freed, so the member 6 is pulled by the spring (since there is no attraction force of the electromagnet 5) and rotates counterclockwise. direction, and the protrusion 2a of the shutter trailing member disengages from the locking member 6, but at this time, the right end of the member 9 locks the shutter trailing member instead of the shutter trailing member 6, so the shutter The trailing member 2 remains stationary.

The shutter preceding member 1 travels to the left, and its left end pushes the member 10 back to the left.

Therefore, the member 9 is forced to rotate clockwise by the member 10, and the right end and the protrusion 2 of the shutter trailing member 2
A is disengaged and the trailing member starts running.

Note that 15 is a part of the lens cover, which must be pulled to the right when taking pictures.

Then, switch S3 is closed and capacitor C' is charged, and then the shutter button 14 is pressed and switch S1
When the magnet 5 is closed and the electromagnet 5 is excited to attract the armatures 6a, 7a of the members 6 and 7, the exciting current is assisted to increase the attractive force.

Also, when the member 15 is pulled to the right, the left end protrusion of the lever 1
Push up the right end protrusion of 3 and turn the lever 13 counterclockwise.
Make it rotate.

The lever 13 uses its left end to push the member 7 toward the locking position so that it does not become disengaged from the cover ratchet wheel 4', and the lever 13 pushes the member 7 toward the locking position so that it does not become disengaged from the cover ratchet wheel 4'. By the rotation of , this suppression is released and the member 7 becomes free.

This device is intended to prevent 7 and 4' from becoming disengaged due to the mistake of releasing the shutter with the lens cover on or due to an external impact.

In the shutter of the present invention, what is added to the electric shutter having the electromagnetic release device is a second shutter trailing member locking member 9 that mechanically locks the shutter trailing member in response to a manual switching operation, and a shutter starter. A mechanically controlled shutter can be easily realized by simply adding a mechanical shutter control device consisting of a transmission member 11 that transmits button operation to a release activation member, and in this case, the number of parts is small, and the shutter can be controlled electrically. When the shutter button is operated, the transmission member is retracted from between the shutter button and the release & moving member 7, and the shutter button only functions to close the switch S, so the operation of the shutter button is (
(Because a mechanical shutter control device is added), it does not become heavy.

[Brief explanation of the drawing]

FIG. 1 is a front view of one embodiment of the present invention, and FIG. 2 is a diagram of the same electric shutter circuit. 1... Shutter leading member, 2... Shutter trailing member, 5
... Electromagnet, 7... Release activation member, 6... First shutter trailing member locking member, 9... Second shutter trailing member locking member, 10... Switching operation member, 11... Transmission member, 14...
Shirt button.

Claims (1)

[Claims] 1 The shutter leading member is activated by the excitation of an electromagnet that is energized in response to the operation of the shutter button, and the shutter leading member is started to run, and the shutter leading member is not in direct mechanical communication with the shutter button, and the shutter starting member is demagnetized by the electromagnetic row. an electric shutter control device having a first shutter trailing member locking member for starting the traveling member; and a shutter trailing member locking member that is inserted between the shutter starter button and the release activation member by manual switching operation. and a second shutter trailing member which advances to the shutter trailing member locking position by the above-mentioned manual switching operation and is mechanically released from the locking position in relation to the movement of the shutter leading member. An electromagnetic release camera equipped with a mechanical shutter control device having a member locking member.