JPS5815929Y2 - Focal plane camera camera synchronized set-up touch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a synchronizing contact device for a focal plane shutter camera, particularly to an X-contact type synchronizing contact device.

Conventionally, most of the synchronization contacts of focal plane shutter cameras use a cam or protrusion provided on the gear that meshes with a gear provided on the front curtain winding shaft and rotates approximately once as the curtain travels. Configured to close.

Such a configuration has the following problems.

That is, since the contact point is controlled by an object rotating at high speed, undesirable phenomena such as chattering and bouncing of the contact point tend to occur, resulting in incomplete contact.

Further, it is necessary to make adjustments to match the closing position of the contact with the end of curtain travel, and the results of this adjustment tend to deviate, making it difficult to achieve complete synchronization.

! Since this type of contact is configured to remain closed from the end of the leading curtain run until the next winding starts, it may become necessary to provide other auxiliary switches. It is.

The object of the present invention is to provide a novel synchro contact device for use in focal plane shutters, which eliminates all of the above-mentioned drawbacks.

In order to achieve the above object, the synchronizing contact device according to the present invention includes a leading curtain regulating tube that rotates together with the leading winding shaft and has a spiral groove on the outer periphery and an abutting surface perpendicular to the rotation direction; A shock absorber having a displacement portion that is displaced while absorbing impact force and returns to its original position after absorption; a damper lever whose position is regulated by the displacement portion of the shock absorber; and a damper lever supported by the damper lever knee. a shaft that is rotatably supported by the shaft, the tip of which engages with the spiral groove, and when the leading curtain finishes traveling, hits the abutting surface and displaces the shock absorber via the shaft and the damper lever. It is composed of a front curtain regulating lever that transmits transmission to the shock absorber, and a contact mechanism that is closed in conjunction with the displacement of the displaced portion of the shock absorber during shock absorption, and is opened in conjunction with the return.

According to the above structure, the object of the present invention can be completely achieved.

The configuration of the present invention will be explained in more detail below with reference to the drawings.

FIG. 1 is a plan view of an embodiment of the present invention, and FIG. 2 is a side view of the embodiment of the present invention.

FIG. 5 and FIG. 6 are perspective views of a focal plane shutter to which the embodiment device is applied.

FIG. 5 shows the winding end position, and FIG. 6 shows the shutter operation end position.

A leading curtain regulating pipe 34 provided integrally with the leading winding shaft 30
A spiral groove 34a is provided therein.

An abutting surface 34c perpendicular to the rotational direction of the playing shaft 30 is provided at the end of the spiral groove 34a.

Reference numeral 44 denotes a trailing curtain regulating tube which is integrally provided with the trailing curtain winding shaft 40 and has the same shape as the leading curtain regulating tube, but since it is not directly related to the present invention, a description thereof will be omitted.

These regulating tubes 34 and 44 are connected to the winding tubes 12 and 2 in the focal plane shutter mechanism shown in FIG.
The springs 13 and 23 provided in the curtain 2 always apply rotational force in the clockwise direction, in the traveling direction of the curtain, and when the shutter is released, the curtain rotates counterclockwise against the force of the springs 13 and 23. , when the shutter is operated, the spring 13
, 23 to rotate clockwise.

Numerals 35 and 45 are regulating levers for regulating the end positions of the leading curtain 10 and the trailing curtain 20 (see FIG. 5), respectively, in cooperation with the regulating pipes 34 and 44, and the leading curtain regulating lever 35 constitutes a part of a mechanism that matches the momentum of the leading curtain mechanism at the end of its travel with a shock absorber to be described later.

The claw portions 35a and 45a provided at the tips of the respective regulation levers 35 and 45 are connected to the regulation pipes 34 and 45.
It is loosely inserted into the spiral grooves 34a and 44a, and is pivoted at such a position that the claw portions 35 and 45a move up and down in accordance with the rotation of the regulating tube (that is, the movement of the curtain).

36 is the common axis of these levers 35 and 45.

One end 36a of this shaft 36 is loosely supported by a bearing provided at a fixed position within the body, and the other end is one end of a damper lever 66 pivotably pivoted at another fixed position within the body by a shaft 83. It is supported by a bearing 66a provided in the.

In FIG. 1, the force applied to the shaft 36 from the right side is
is moved clockwise using one end 36a of the shaft as a fulcrum, and acts to rotate the damper lever 66 counterclockwise (FIG. 2).

A claw portion 66b provided on the opposite side of the bearing 66a of the damper lever 66 is a piston 68b of an air damper, which will be described later.
are brought into contact with.

A pin 67 that acts on a synchro contact, which will be described later, is installed in the claw portion 66b of the damper lever 68.

Pins 80 and 8 provided at fixed locations within the body
Reference numeral 1 denotes a pin for determining the movement range of the damper lever 66, and the swing range of the damper lever 66 is restricted within this interval.

The shock absorber is composed of an air piston type damper consisting of a cylinder 68, a piston 68b, and a spring 68a.

In this embodiment, the inner diameter of the cylinder 68 is set to 4, and the outer diameter of the piston 68b is made smaller by about 0.03 mm than that, and is configured as an air viscous damper with a gap on the side of the piston. The internal structure is shown by cutting through the plane.

Note that it is also possible to configure the damper as a piston flow hole type damper.

The spring 68a is a spring used to return the piston 68b to its original position after the impact on the piston 68b has ceased, and the spring itself is strong enough to be easily compressed against the impact applied to the piston 68b. In this case, the leading winding shaft 30 and the trailing winding shaft 40 receive static forces from the springs 13 and 23 (see FIG. 5) provided in the winding tube at the end of the shutter operation. The force of pushing the piston 68b clockwise is strong enough to overcome the force pushing the piston 68b.

When an impact force is applied to the piston 68b, the piston 6
8b is pushed in the direction of arrow C (Fig. 2), and when the momentum of the leading curtain mechanism is absorbed as work, it is pushed back in the direction of the arrow by the force of the spring 68a and returns to its original position. has been done.

Reference numeral 70 denotes a synchronizing contact mechanism, in which when the damper lever 66 is moved clockwise (FIG. 2), the contact piece 7 is activated by a pin 67 planted in the 66b portion of the damper lever.
It is fixed within the camera at a position where 0a and 70b are brought into contact.

One of the contact pieces is connected to one terminal of the synchro terminal provided on the surface of the camera body, and the other contact piece is connected to the other terminal of the synchro terminal through the ground point or directly (Fig. 4). reference).

Next, the operation of the embodiment device having the above configuration will be explained.

When the front curtain 10 and the rear curtain 20 are rolled up,
Figure 5 shows the leading curtain regulating tube 3 in its rolled up state.
40 Clockwise rotation is permitted, and this is done by clockwise rotation of the front curtain tensioning lever 50 shown in FIG. 5, according to the front curtain regulation TjlJ! 34 starts rotating clockwise.

According to this rotation, the tip end 35a of the leading curtain regulating lever 35 is guided by the spiral groove 34a and gradually moves downward from the position indicated by the dotted line in FIG.

When the leading curtain reaches the operation end position, that is, the leading curtain is fully opened, the abutting surface 34c provided on the regulating tube 34 and perpendicular to the rotational direction of the leading winding shaft 300 is connected to the claw portion 3 at the tip of the leading curtain regulating lever.
It collides with 5a.

Due to this collision, the shaft 36 of the regulating lever receives a force to the left and rotates clockwise about the portion 36a as a fulcrum.
6 in the counterclockwise direction, in the direction of arrow E shown in FIG.

The above-mentioned force is applied by the collision, and the claw portion 66b of the damper lever starts pushing the piston 68b of the damper in the direction of arrow C.

The speed of this push-in becomes slower as the kinetic energy held when the leading curtain mechanism is fully opened is absorbed by the buffer.

The movement of the piston 68b, that is, the damper lever 66
By the movement of the pin 67 that is set up in the 66b portion of the synchronizing contact, the contact piece 70a of the synchronizing contact is pressed against the other contact piece 70b, and the synchronizing contact circuit is closed.

The piston 68b moves while discharging air from the gap between the piston 68b and the cylinder 68, and when the leading curtain mechanism has absorbed the kinetic energy that it had when it was fully opened, the piston 68b moves to the restoring spring 68a of the damper. The force pushes it back in the direction of the arrow.

In this process, the damper lever is pushed clockwise and returned to the position before receiving the impact, and the contact pieces 70a and 70b of the synchro contact are separated, opening the synchro contact circuit.

Since the device according to the present invention is constructed and operates as described above, it is possible to completely achieve the object of the present invention.

The synchro contact of the conventional focal brain shutter is
In many cases, the front curtain was closed by sudden contact with a cam or protrusion on the winding shaft.

Therefore, contact chatter and bounce were likely to occur.

However, since the contact mechanism of the device according to the present invention is closed and opened in conjunction with the movement of the shock absorber piston 68b (the displaced portion of the shock absorber), chattering or bouncing of the contact does not occur.

Piston 68b of the damper (displaced portion of the damper)
Since the movement of is performed at the end of the front curtain travel, the contact mechanism is definitely operated at the end of the front curtain travel.

Therefore, there is no need for timing adjustment, which was important in conventional devices.

Adjustment is also extremely easy.

Furthermore, although a conventional single-lens reflex focal plane shutter uses a circuit as shown in FIG. 3, the circuit according to the present invention does not require an auxiliary switch.

In a conventional system in which the synchronizing contact is closed by a cam or the like provided on the front curtain shaft, the synchronizing contact remains closed even after the shutter operation is completed until the next winding is performed.

That is, in the conventional device, unless an auxiliary circuit is used, there is a problem in that if a light emitting device such as a flash pulp is connected to the synchro contact before the next winding, the light will emit light.

Therefore, in conventional devices, a switch is provided that is linked to the movable mirror of a single-lens reflex camera and is closed only when the mirror is rising, and is connected in series to the synchronization contact, and the synchronization contact circuit is closed only when the mirror is rising. was prevented from forming.

However, in the device according to the present invention, since the buffer has the property of returning to its original state, the synchro contact is also opened within a certain period of time after the end of the front curtain operation, so there is no need for an auxiliary switch like in the conventional device. No longer needed.

Further, the synchro contact device according to the present invention is closed only for a certain period of time determined by the reciprocation of the buffer.

Therefore, there is no problem that the closing time changes depending on the shutter speed.

In the case of a structure in which the contact is closed when the leading curtain is running and the contact is opened when the trailing curtain is running, the contact closing time depends on the shutter speed.
In the device according to the present invention, the contact can always be closed for a certain period of time sufficient to drive the flashlight from the end of the front curtain run.

The flashlight emitter is supplied with driving voltage or current only for a certain period of time when it is triggered, so that no power is wasted.

In particular, the problem of continuing to supply current for a long time to a low resistance when a flash bulb misfires has been completely solved.

As an embodiment of the present invention, a case has been shown in which the opening and closing of the synchro contact 70 is controlled by the pin 67 installed on the damper lever 66, but it is also possible to directly control the opening and closing of the synchro contact 70 by the movement of the piston 68b of the shock absorber. All mechanisms that open and close in response to movement are within the scope of this invention.

Although a piston plow type 1 air damper is shown as an example of a damper, the shock absorber is not limited to this, and the self-blade restoring mechanism does not necessarily need to be installed inside the shock absorber, but may be installed at an appropriate location outside. All buffers having the configurations described in the claims of the utility model registration can meet the purpose of the present invention.

The gist of the present invention is to operate the synchro contact mechanism in conjunction with the displacement of the shock absorber at the end of the leading curtain run, but the shock absorber is also operated at the end of the trailing curtain run to absorb shock in the same way. act.

However, the synchro contact mechanism cannot be operated for the following reasons.

As shown in FIG. 1, one end 36a of the shaft 36 is supported at a fixed position on the camera body, and the distance from the trailing curtain regulating lever 45 to the 36a is the same as the distance from the leading curtain regulating lever 35 to the 36a. is smaller than the distance.

The amount of movement of the displacement portion (piston cylinder 68b) of the shock absorber 6B at the end of the trailing curtain travel is smaller than that at the end of the leading curtain travel, and does not operate the synchro contact mechanism.

However, even if the synchro contact is closed, the light emitting device is not yet ready to emit light, so it is unlikely that it will malfunction.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view of an embodiment of an apparatus according to the present invention, and FIG. 2 is a side view. FIG. 3 is a circuit diagram of a synchro contact point of a conventional single-lens reflex focal plane shutter camera, and FIG. 4 is a configuration example of a synchro contact circuit according to the present invention. 5 and 6 are perspective views of a focal plane shutter to which an embodiment of the present invention is applied. FIG. 5 shows the shutter operation end position, and FIG. 6 shows the shutter operation end position. 10...first curtain, 20...second curtain, 30...
...First curtain upper axis, 40... Second curtain upper axis,
34... Leading curtain regulating tube, 44... Trailing curtain regulating tube, 35... Leading curtain regulating lever, 45...
... Rear curtain regulation lever, 34a... Abutting surface perpendicular to the rotational direction of the front curtain upper shaft, provided on the front curtain regulation pipe, 3
6... Regulation lever shaft, 67... Pin that opens and closes the synchro contact, 68... Cylinder of the shock absorber, 68a... Spring for restoring the shock absorber. , 68b
...Buffer piston, 70 ... Synchro contact, 80.81 ... Stopper pin, 5
0... Leading curtain tension lever, 12... Leading curtain winding pipe, 22... Trailing curtain winding pipe, 13...
- Front curtain spring, 23...Rear curtain spring.

Claims (1)

[Scope of utility model registration request] The leading curtain regulating tube rotates together with the leading winding shaft and has a spiral groove on its outer periphery and an abutting surface perpendicular to the direction of rotation, and is displaced while absorbing impact force, and returns to its original position after absorption. a damper lever having a displacement portion; a damper lever whose position is regulated by the displacement portion of the buffer; a shaft supported by the damper lever; a leading curtain regulating lever that engages with the groove, hits the abutment surface at the end of the trailing curtain run, and transmits the impact to the displaced portion of the shock absorber via the shaft and the damper lever; and an impact on the displaced portion of the shock absorber. A synchronized contact device for a focal plane shutter camera consisting of a contact mechanism that closes in conjunction with displacement during absorption and opens in conjunction with return.