JPS6328412Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a flash mechanical mechanism, and more particularly to a flash mechanical mechanism for an automatic focusing camera or a camera that presets the stop position of a focusing lens.

Conventionally, a distance-displacement member has a distance-aperture linkage cam and can be displaced in accordance with the shooting distance, and can be displaced to engage with the distance-aperture linkage cam, thereby adjusting the aperture value depending on the shooting distance. A flash automatic mechanism is well known which includes a distance-diaphragm regulating member that provides a distance-diaphragm regulating member and a manual locking member that locks the distance-diaphragm regulating member so as not to engage with the distance-diaphragm linking cam. However, such a flash mechanism is not suitable for a folding camera in which the camera body and lens board are connected by a telescoping bellows barrel, with a shutter release operating member provided in the camera body and a shutter release operating member attached to the lens board. When a diaphragm member is provided, it is difficult to mechanically interlock the two members because of the presence of a telescopic bellows lens barrel in the middle, so it is difficult to adopt this method. Therefore, interlocking the signal from the shutter release operating member with the aperture member can be easily achieved by converting it into an electrical signal. Furthermore, when conventional flash-matic mechanisms are used in conjunction with a flash device, they are subject to positional constraints, and when used in autofocus cameras, they often create resistance to movement of the focusing lens. Ta. As mentioned above, this problem can be solved by converting the signal from the shutter release operating member into an electrical signal.

This invention provides less resistance to the movement of the focusing lens, and allows the camera body and lens board to be extended and retracted, for example, in cameras where the camera body and lens board are separated and it is difficult to mechanically link them. The present invention provides a flash mechanism that can be easily applied to cameras such as the above, and includes a charge member that is locked in a charge position and is released from the lock by a release operation and moves to a release position. a distance displacement member having a distance-diaphragm linkage cam and displaceable in conjunction with the charge member from a fixed starting position on the short distance or infinite distance side to a position corresponding to the shooting distance; a distance-aperture regulating member that can be displaced to match the distance, thereby providing an aperture value that corresponds to the shooting distance;
spring biased, and movement of the charge member to the charge position brings the distance-diaphragm restriction member into a locking position against engagement with the distance-diaphragm linking cam against the spring bias; A locking member that is released from the locking position by spring bias, and a permanent magnet that holds the locking member brought to the locking position are built in, and the charge is removed by the release operation for flash photography. The flash automatic mechanism is characterized by comprising: an electromagnet that is energized to release the holding of the permanent magnet after the movement of the member to the release position is started.

Hereinafter, the present invention will be explained based on the drawings.

FIG. 1 is a front view of the essential part showing an embodiment of the present invention in a charged state ready for photography, and FIG. 2 is a front view of the essential part showing a state in which photography has been performed by operating the flash mechanism.

In the figure, 1 is a charge ring, 2 is a distance displacement member that is displaced according to the photographing distance, and the charge ring 1 moves counterclockwise around the optical axis from the release position shown in the second figure to the charge position shown in the first figure by charging. is given a rotation of , at which time the working arm 1
a engages with the driven arm 2a of the distance displacement member 2, the distance displacement member 2 is also rotated to the charge position shown in the first figure, and when the charge position is reached, it is engaged by a locking means (not shown). be stopped. The distance displacement member 2 is provided with a distance/diaphragm linking cam 2d having a protruding portion 2b and a locking portion 2c at both ends. Reference numeral 3 denotes a distance-diaphragm regulating member, which is rotatable around the shaft 4, and includes a cam pin 3a that engages with the distance-diaphragm linking cam 2d, an aperture regulating portion 3b, and a distance-diaphragm regulating member 3a.
A locked portion 3c that is locked so as not to engage with the aperture linking cam 2d is provided. The shaft 4 of the distance-diaphragm regulating member 3 is mounted on a compensation lever 6 rotatably supported on a fixed shaft 5.
The tip of the cam 7 is engaged with the compensating cam 7. 8 is distance-
This is a locking member that locks the aperture regulating member 3 so that it does not engage with the distance-diaphragm linking cam 2d, and is rotatable around a fixed shaft 9, and has a locking arm 8a and an armature arm 8b. A reset member 10 is rotatably supported on a fixed shaft 9 like the locking member 8, and is connected to the locking member 8 by a coupling spring 11. When the charge ring 1 is rotated to the charge position as described above, the reset member 10 is rotated clockwise by its driven arm 10a being pushed by the reset pin 1b provided on the charge ring 1, and the locking member 8 is rotated clockwise.
is reset so that the armature arm 8b is held by the electromagnet 12. The electromagnet 12 has a built-in permanent magnet, and the armature arm 8b of the locking member 8 is attracted and held by the permanent magnet. 1
Reference numeral 3 denotes an aperture pin which is rotatable around a shaft 14 and whose aperture value is set depending on its position.When the distance-aperture regulating member 3 engages with the distance-aperture linking cam 2d, the distance-aperture regulating member The aperture regulating portion 3b comes into contact with the aperture pin 13 and provides an aperture value according to the distance.

Now, in the shooting preparation charge state shown in Figure 1,
When the release operation is performed, the aforementioned locking means (not shown) of the charge ring 1 is released, and the charge ring 1 is rotated clockwise by a known drive means (not shown). As a result, the reset pin 1b releases the push of the reset member 10 against the driven arm 10a, so that the locking member 8 is in a state where it can be pulled by the spring 15 and displaced at any time when it is released from being held by the electromagnet 12.
However, when flash photography is not performed, the electromagnet is not activated and the locking member 8 remains held by the electromagnet 12. When the charge ring 1 rotates clockwise, the distance displacement member 2 is also driven by a known means such as a spring (not shown), and the spring 16
Accordingly, the cam pin 3a is connected to the distance-diaphragm link cam 2d.
The distance-aperture regulating member 3, which is biased to rotate in the direction of contacting the distance-aperture regulating member 3, tries to rotate counterclockwise to engage the distance-aperture linking cam 2d, but as described above, it is stopped. If the member 8 remains held by the electromagnet 12, the regulated portion 3c will come into contact with the locking arm 8a of the locking member and will not be able to rotate any further, and in this state, the distance - of the diaphragm restriction member 3 will change. Aperture regulation part 3
b does not come into contact with the aperture pin 13, and therefore the aperture pin 13 is not regulated by the distance-aperture regulating member 3 but is controlled by the conventionally known EE device. The rotation of the distance displacement member 2 is locked together with the movement of the focusing lens by a distance setting locking member (not shown) or, in the case of an automatic focusing camera, a known locking means that operates based on a focus signal. Subsequently, a shutter release or the like is performed to perform normal photographing.

In the case of flash photography, after the distance displacement member 2 is driven by the charge ring 1 until it is locked, the electromagnet 12 operates to cancel the magnetic force of the permanent magnet, and the locking member 8 is activated by the spring 15. It is pulled by and rotates counterclockwise. Therefore, the distance-diaphragm regulating member 3 is no longer locked by the locking member 8, and the distance-diaphragm regulating member 3 is no longer locked by the cam pin 3a.
comes to rotate so as to come into contact with the distance-diaphragm linking cam 2d. As a result, the aperture regulating portion 3b of the distance-aperture regulating member comes into contact with the aperture pin 13, and when the distance displacement member 2 is then locked with the movement of the focusing lens, at that time the cam pin 3a is moved to the distance-aperture regulating member. The distance in contact with the aperture linking cam 2d - the amount of rotation of the aperture regulating member 3 gives an aperture value corresponding to the distance. Subsequently, the shutter is opened by a known means, and after the flash device emits light, the shutter is closed and flash photography is completed. In this case, if the film sensitivity or the strobe guide number changes and it is necessary to correct the aperture value according to the distance given by the distance-aperture linking cam 2d,
By rotating the compensation cam 7 in accordance with the film sensitivity and the guide number of the strobe, the compensation lever 6 is rotated and the position of the rotation center axis 4 of the distance-aperture regulating member 3 is changed, so that the above correction is performed. It turns out. Note that the compensation lever 6 is urged by a spring 17 so as to come into contact with the compensation cam 7. In addition, if the shooting distance is set beyond the flash shooting range, or for some reason with an autofocus camera, the focusing lens, that is, the distance displacement member 2
If the cam pin 3 of the distance-aperture regulation member 3 is not locked in the flash photography possible range,
Since a is caught, photography will be performed at the limit of the flash photography range in those cases as well. When flash photography is not used, that is, when the distance-aperture regulating member 3 is locked to the locking member 8, the cam pin 3a is not caught by the locking portion 2c.

As described above, in the present invention, since the electromagnet 12 is activated to perform flash photography, the position of the release operating member and the flash device relative to the flash mechanism is is not limited, it can be applied to foldable cameras, and automatic interlocking is easy. In addition, the length of the cam pin 3a of the distance-aperture regulating member 3 in contact with the protrusion 2b of the distance displacement member 2 can be In addition to making it shorter, it is also possible to easily activate the electromagnet 12 just before the distance displacement member 2 is locked, so when applied to an automatic focusing camera, there is less resistance to movement of the focusing lens. It can also have the effect of giving very little.

[Brief explanation of the drawing]

FIG. 1 is a front view of the main parts of an embodiment of the present invention in a charging state in preparation for photographing, and FIG. 2 is a front view of the main parts showing a state in which the flash automatic mechanism is activated to take a photograph. 1...Charge ring, 2...Distance displacement member,
2b...protrusion, 2d...distance-diaphragm link cam,
3...Distance-diaphragm regulating member, 3b...Aperture regulating part, 3c...Restricted part, 8...Locking member, 8a...
... Locking arm, 8b ... Armature arm, 10 ... Reset member, 10a ... Driven arm, 12 ... Electromagnet,
13...Aperture pin.

Claims (1)

[Claims for Utility Model Registration] 1. A charge member that is locked in a charge position and is released from the lock by a release operation and moves to the release position, and a distance-diaphragm linking cam,
a distance displacement member that is displaceable in conjunction with the charge member from a constant starting position on the short distance or infinite distance side to a position corresponding to the photographing distance; Therefore, the distance-diaphragm regulating member that provides an aperture value corresponding to the photographing distance is biased by a spring, and the movement of the charge member to the charge position resists the spring bias, and the distance-diaphragm regulating member is biased by the spring. Distance - A locking member brought to a locking position so as not to engage with the aperture linking cam and removed from the locking position by spring bias, and a locking member brought to the locking position. and an electromagnet that is energized to release the holding of the permanent magnet after the charge member starts moving to the release position by a release operation for flash photography. Tsushiyumachitsuku mechanism. 2. Scope of Utility Model Registration Claim 1, in which the displacement of the distance-aperture regulating member is a rotational displacement, and its axis is linked with a compensation cam that is displaced in accordance with the setting of the film sensitivity value, the guide number of the strobe, etc. The flashing mechanism described. 3. A locking part is provided at the terminal end of the distance-diaphragm linking cam for stopping the distance-diaphragm regulating member engaged with the cam from moving the distance displacement member from the constant starting position. A flash mechanical mechanism according to claim 1 or 2 of the invention registration claim.