JPS6131852B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a lens board support mechanism suitable for a folding camera.

Generally, a lens board containing a built-in photographic lens, shutter mechanism, etc. is supported at the tip of a front cover that is hinged to the front of the camera body, and the lens board and camera body are connected by a folding lens barrel. A folding camera is often used in which the lens board is positioned at the shooting position in front of the camera body when the front cover is opened, and the lens board is moved in the optical axis direction and stored at the front of the camera body when the front cover is closed. Are known.

By the way, the most important mechanism in this type of folding camera is the lens board support mechanism (so-called sash mechanism) that orients the lens board to the shooting position when the front cover is opened. Because a diagonally structured two-fold sash mechanism was used between the front cover and the front cover, the localization accuracy of the lens board was unstable, and when the sash mechanism was folded in two when the front cover was closed, There were various problems, including the risk of fingers being pinched.

The present invention has been made in view of the above conventional problems, and includes a first member having one end pivoted to the side of the lens board substantially perpendicular to the optical axis at the photographing position, and a first member having one end substantially parallel to the optical axis. The intersection with a second member lockably supported at the front of the camera body is connected to form a sturdy, roughly inverted L-shaped link mechanism, and the middle part of the first member is connected to the tip of the inner surface of the front lid. The lens board is pivotally connected to the front lid to support the lens board, and a stopper for stopping rotation of the lens board is provided,
When the front cover is opened, the lens board is stably positioned at the shooting position by the first and second members and the rotation stopper, while when the front cover is closed, the two-fold part of the link mechanism is held directly with your fingers. without breaking it in half,
To provide a lens board support mechanism in which a first member and a second member can be safely folded into the front part of a camera body simply by unlocking the second member.

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in FIGS. 1 and 2a, the folding camera includes a roughly square box-shaped camera body 2 having a square frame-shaped storage frame 1 on the front.
A front cover 4 is hinged to the lower edge of the storage frame 1 with a hinge shaft 3 so that it can be opened and closed freely, and a photographic lens 5, a shutter mechanism (not shown), etc. are built into the tip of the front cover 4. The lens board 6 is supported by a lens board support mechanism to be described later, and the back side of the lens board 6 and the inside of the camera body 2 are connected by a folding lens barrel 5a, so that when the front cover 4 is opened, the folding lens barrel 5a Expand the lens board 6 and attach it to the camera body 2.
While the lens board 6 is positioned at the front photographing position, when the front cover 4 is closed (see FIG. 2 d), the lens board 6 is moved in the optical axis direction while folding the collapsible lens barrel 5a and stored in the storage frame 1. This is what I did. Note that 7 is a finder provided above the grip 8 on the right side of the camera body 2 in the figure, and 9 is a distance measurement window.

On the other hand, the lens board support mechanism shown in FIG.
At the shooting position shown in , almost perpendicular to the optical axis,
A U-shaped support member 10 is provided with both rising ends pivoted on the optical axis on both sides of the lens board 6 at a pivot point a, and the middle part of the support member 10 is fixed upright on the inner surface of the front cover 4. 11 at pivot point b to support the lens board 6 against the front cover 4, and one end of which is supported by both inner surfaces of the housing frame 1 of the camera body 2, approximately parallel to the optical axis. A support lever 12 is provided, and the intersection of the other end of the support lever 12 and the other end of the support member 10 is connected at a connection point c to form an inverted L-shaped link mechanism.

A lock member 13 that supports one end of the support lever 12 on the inner surface of the storage frame 1 is configured such that the long groove 14 of the support lever 12 is supported by a guide pin 15 implanted in the center. In addition, a lock groove 17 that engages with the lock piece 16 of the support lever 12 and a cam surface 18 that guides the lock piece 16 are provided, and a wire spring 19 always moves the support lever 12 in the front lid opening direction (second direction).
It is energized in the direction of the hour hand (in figure a).

Therefore, when the front cover is opened, the locking piece 16 of the support lever 12 engages with the locking groove 17 of the locking member 13, so that the lens board 6 is locked in the support lever 12.
and the support member 10 to hold the camera at the photographing position. Since this lens board 6 rotates at a pivot point a of the support member 10, it is therefore pivoted to the lens board 6 at a pivot point d, which is distant from the pivot point a, and at the same time, at a pivot point b. A positioning lever 20 is provided which is pivotally connected to the inner surface of the front cover 4 at a pivot point e which is separate from the pivot points e and c, and the lens board 6 is moved to the shooting position by canceling out the rotational force of the lens board 6 at each pivot point. I'm trying to position it in the right direction. Note that a simple click mechanism may be used as a rotation stopper instead of the positioning lever 20 to stop the rotation of the lens board 6.

Next, on the inner surface of the front lid 4, a lock release lever 22 is provided, one end of which extends to the long groove 14 side end of the support lever 12, and whose center portion is pivoted by a pin 21.
By pushing the knob 23 at the other end downward, the support lever 12 is slid upward along the long groove 14 with one end of the lock release lever 22, and the lock piece 16 of the support lever 12 is locked into the lock groove 17 of the lock member 13. I try to remove it from Reference numeral 24 designates a three-pronged rocking lever whose one arm engages with the lock release lever 22. The lock release lever 22 is always urged in the counter-push direction (counter-clockwise in FIG. 2a) by a coil panel 25. ing.

In the folding camera configured as above,
Now, in the photographing state shown in FIG. 2a, the lock member 1
a support lever 12 substantially parallel to the optical axis with a lock piece 16 engaged in a lock groove 17 of the support lever 1;
2, by the support member 10 held substantially perpendicular to the optical axis via the connecting part c and the positioning lever 20,
The lens board 6 is positioned at the photographing position at the tip of the opened front lid 4. In this case, since the support lever 12 uses the guide pin 15 and the front cover 4 uses the hinge shaft 3 as a rotational fulcrum, the rotational forces of both cancel each other out, resulting in stable orientation.

Then, when the knob 23 is pushed, the lock release lever 23 slides the support lever 12 upward and removes the lock piece 16 from the lock groove 17. In this state, as shown in FIGS. 2b to 2c, As the front cover 4 is closed, the lock piece 16 begins to move along the cam surface 18 of the lock plate 13 using the guide pin 15 as a rotational fulcrum.

Further, the support member 10 has a pivot point b, a positioning lever 2
0 uses pivot points d and e as rotational fulcrums, and rotates counterclockwise while moving the lens board 6 and folding lens barrel 5a approximately in the direction of the optical axis, and closes the front cover 4 as shown in Fig. 2d. At times, the lens board 6, the folding lens barrel 5a, and the support member 10 are rotated 180 degrees and folded together with the support lever 12 into the storage frame 1. The front cover 4 is locked to the camera body 2 by suitable locking means in the closed position.

To put this folded camera into shooting mode,
When the front cover 4 is opened, the support lever 1
2. The support member 10 and the positioning lever 20 rotate around the hour hand, and the lens board 6 and the folding lens barrel 5a
is pulled out from the storage frame 1, and when the front cover 4 is in the open position,
Since the locking piece 16 of the support lever 12 engages with the locking groove 17 of the locking member 13 again, the lens board 6 is positioned at the photographing position.

By using the support lever 12 parallel to the optical axis of the above embodiment, the distance meter of the finder 7 and the photographing lens 5 can be used.
An interlocking distance meter can be constructed by simply connecting the two sides with a simple interlocking lever.

That is, as shown in FIGS. 3a and 3b,
An objective lens 30, a semi-transparent mirror 31, and an eyepiece 32 are built into the finder 7, and a small window 33 is provided below the semi-transparent mirror 31 to form a double image coincident portion in the field of view of the finder 7. Below the small window 33, the distance measuring light from the distance measuring window 9 is passed through the small window 3.
A finder housing 35 supported by a reflective mirror 34 guided to the semi-transparent mirror 31 via a
The rising portions 37 and 37 on both sides are connected to the frame so that the distance measuring lens 36 located on the distance measuring optical path between the small window 33 and the reflecting mirror 34 swings in a direction intersecting the distance measuring optical path. A swinging arm 38 is provided swingably suspended on both sides of the Ainder housing 35 so that the swinging arm 38 swings in conjunction with focus adjustment of the photographic lens 5, thereby achieving a double image matching type linked distance. It makes up the meter.

The lens board 6 is provided with a moving lever 39 that moves back and forth in response to the feeding of the photographic lens 5, while guide pins 41, 4 are provided on the outer surface of the support lever 12 and fit into a pair of guide grooves 40, 40.
1 is provided with a linking lever 42 that is slidably guided in a reciprocating manner, and one end of the linking lever 42 is connected to a moving lever 39.
and the other end is connected to the swing arm 38.
When the photographic lens 5 is extended, the swinging arm 38 is swung and linked via the moving lever 39 and the linking lever 42.

In addition, as the front cover 4 is opened and closed, the linking portion between the movable lever 39 and the swing arm 38 of the linking lever 42 is naturally disengaged, and the linking lever 42 comes to move together with the support lever 12.

As is clear from the above explanation, the present invention
At the shooting position, the lens board is positioned at the shooting position using a link mechanism consisting of a first member that is substantially perpendicular to the optical axis and a second member that is substantially parallel to the optical axis, resulting in a robust lens board support structure. This allows the lens board to be stably localized.

Furthermore, when closing the front cover, it is only necessary to release the lock on the second member, and there is no need to directly break the joint between the first and second members in two with your fingers, as is the case with conventional methods. It has great practical value, as there is no risk of being exposed to it.

[Brief explanation of the drawing]

Figure 1 is a perspective view of the folding camera, Figure 2a is a side view of the lens board support mechanism at the shooting position,
Figures 2b and 2c are the same as Figure 2a in the middle of folding, and Figure 2d is the same as the second figure in the storage position.
FIG. 3a is a perspective view of a rangefinder finder, and FIG. 3b is a perspective view of a folding camera equipped with a rangefinder interlocking mechanism. 2...Camera body, 4...Front lid, 5...Photographing lens, 5a...Folding lens barrel, 6...Lens board, 10...Support member, 12...Support lever,
a, b...pivot point, c...connection point, 20...orientation lever, 13-18...support lever locking mechanism.

Claims (1)

[Scope of Claims] 1. A lens board containing a built-in photographic lens, a shutter mechanism, etc. is supported at the tip of a front cover hinged to the front of the camera body, and the lens board and camera body are folded together to form a lens barrel. When the front cover is opened, the lens board is positioned at the shooting position in front of the camera body, and when the front cover is closed, the lens board is moved in the optical axis direction and stored in the front of the camera body. A folding camera, comprising a first member pivotally connected to a side wall of a lens board at a first pivot point, and a second member having one end pivotally connected to the first member at a second pivot point; The first member is connected to the front lid at a third pivot point, and there is a connection between the first member and the lens board.
A rotation stopper is provided to prevent rotation of the lens board at the photographing position with the front lid open, and the second member is arranged so as to be substantially parallel to the photographing optical axis with the front lid open. When the second member is extended and the other end of the second member is extended on the side of the camera body, it is locked and held by a locking mechanism that can be released. By releasing the lock of the second member, the front cover can be secured to the lens. A lens board support mechanism for a folding camera, characterized in that the lens board is folded together with the board into the front of the camera body.