JP2001305604A - Shutter mechanism for camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shutter mechanism with simple structure suitable for a practical plate type lens-fitted photographic film unit. SOLUTION: This shutter mechanism is equipped with a sector plate supported in a light shielding barrel so as to freely rotate with respect to a member having the diaphragm aperture of a photographing lens and equipped with an aperture for exposure which passes a position where it is superposed on the diaphragm aperture in the midst of rotation so as to expose photographic film, an energizing means for energizing the sector plate in one rotating direction, a locking means for preventing the rotation of the sector plate against the energizing force of the energizing means, a shutter release mechanism releasing rotation preventing action on the sector plate by the locking means, and a rotation restricting means restricting the rotation of the sector plate under the action of the energizing means when the rotation preventing action is released by the shutter release mechanism to be within a specified range.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a simple and inexpensive shutter mechanism which can be used for a film unit with a lens and other simple photographing devices.

[0002]

2. Description of the Related Art Japanese Patent Laying-Open No. 2000-19607 discloses a thin camera having a plate-shaped camera body. This thin camera is provided with a photographing optical system such as a pinhole in which a sheet-like unexposed photographic film is previously loaded and supported by a bellows structure. The shutter has a single-use structure, and photographing is performed by pulling out the bellows and pressing a shutter release button. The thin camera known from this publication is convenient to carry, but has a problem that it can only take one frame.

[0003] Japanese Patent Application Laid-Open No. 11-352564 discloses a thin film unit with a lens capable of photographing a plurality of frames. One configuration of a film unit with a lens disclosed in this publication is to move a photographing lens to a plurality of photographing positions along a predetermined guide groove and perform photographing at each position. This publication discloses, as another configuration, a lens-fitted film unit that uses a disc-shaped film in which a plurality of photographing areas are formed in one or two rows in the circumferential direction. However, this publication does not provide a detailed description of how to configure the shutter mechanism, and it is also sufficient in how to prevent rash of the next frame during shooting of one frame. There is no explanation, and great difficulty is expected in implementation.

[0004]

In consideration of such circumstances, the present invention can be easily applied to a plate-like lens-equipped film unit which is much thinner than a conventional lens-equipped film unit. It is an object of the present invention to provide a simple shutter mechanism that can be used for a photographing device such as the one described above.

[0005]

Means for Solving the Problems In order to solve the above problems, the present invention provides a shutter mechanism for a photographing device including a light-shielding cylinder having a photographing lens disposed at a front end and having a central axis in a longitudinal direction. This shutter mechanism is rotatably supported by the light-shielding cylinder with respect to a member having an aperture opening of the photographing lens, and is used for exposure to perform exposure to a photographic film through a position overlapping the aperture opening during rotation. A sector plate having an opening, biasing means for biasing the sector plate in one rotation direction, locking means for preventing rotation of the sector plate against the biasing force of the biasing means, locking A shutter release mechanism for releasing the rotation inhibiting action on the sector plate by the means, and a rotation for limiting the rotation of the sector plate under the action of the urging means when the rotation inhibiting action is released by the shutter release mechanism. Limiting means.

In a specific aspect of the present invention, a plurality of aperture openings are formed in the base member at equal intervals in the circumferential direction. The rotation restricting means includes an arc-shaped slot formed in the sector plate and a pin member provided on the holding plate so as to engage with the arc-shaped slot. The pin member of the holding plate engages with the end of the arc-shaped slot of the sector plate when the sector plate rotates by a predetermined distance that does not exceed the circumferential distance between two adjacent aperture openings, and the rotation of the sector plate is performed. To block. The holding plate is supported by the light-shielding cylinder so as not to rotate at all times, but can be rotated in the biasing direction of the biasing means to release the blocking action against the rotation of the sector plate. The locking means includes a shutter member for preventing rotation of the sector plate under the urging force of the urging means when the holding plate is rotated by an angle corresponding to a circumferential interval between two adjacent aperture openings. The shutter release mechanism includes a member that releases the locking action of the shutter locking member.

[0007]

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

FIG. 1 is an exploded perspective view of a film unit 1 with a plate-like lens suitable for employing a shutter mechanism according to an embodiment of the present invention. The unit 1 includes a thin flat plate-shaped unit main body 2. This unit body 2
As shown in FIG. 2, the plate-shaped back member 2 has a rectangular shape as a whole.
a and a front member 2b having a similar shape.

A front surface 2c of the back member 2a has a flat shape, and a sheet-shaped unexposed photographic film 3 is disposed on the front surface 2c. The front member 2b has a rectangular opening 2d that defines an exposure frame of the sheet-like photographic film 3. Front member 2
3b is attached to the back member 2a with the photographic film 3 interposed therebetween, as shown in FIG. At this time, in order to prevent the unexposed photographic film 3 from rash, a light-shielding strip, that is, a telem 4 is disposed between the back member 2a and the front member 2b. Also, between the photographic film 3 and the front member 2b,
It is preferable to arrange the plate-shaped light shielding member 5 so that it can be pulled out in the lateral direction. The light-blocking member 5 is pulled out in the horizontal direction during photographing. In order to facilitate removal of the film 3 after photographing, the back member 2a and the front member 2b are formed with cutable cuts 2e. By folding the back member 2a and the front member 2b along the cut 2e after the photographing, the end of the photographed film 3 is exposed, so that the film 3 can be easily taken out.

On the front side of the unit main body 2, a light-shielding cylinder 6 having a structure that can expand and contract in the optical axis direction in a telescope shape is arranged.
The light-shielding cylinder 6 is composed of a plurality of tubular members 6a, 6b, 6c, 6d fitted in a telescope shape so that they cannot rotate relative to each other, but can relatively slide in the optical axis direction. Is done. The rear end cylindrical member 6a is attached to the front member 2b so as to surround the opening 2d of the front member 2b of the unit body 2. At the rear end of the cylindrical member 6a, a shielding plate 7 having a four-circle notch 7a is disposed rotatably with respect to the cylindrical member 6a.

A front cover 8 is provided for attaching the light shielding tube 6 to the unit body 2. The front cover 8 has a circular opening 8a into which the cylindrical member 6a of the light shielding cylinder 6 can be fitted. As shown in FIG. 3, the cylindrical member 6 a has a flange 9 extending radially outward at a rear end portion, and the flange 9 is sandwiched between the front portion 2 b of the unit main body 2 and the front cover 8 to rotate. It is held impossible.

A cylindrical member 6d at the tip of the light-shielding cylinder 6 supports a taking lens / shutter mechanism 10 according to the present invention.
The photographing lens / shutter mechanism 10 is arranged so as to be rotatable with respect to the cylindrical member 6d, and is rotatably disposed on the base plate 10a in front of the base plate 10a. A holding plate, that is, a lens holder 10b, and a sector plate 10c for a shutter mechanism rotatably disposed on the base plate 10a behind the base plate 10a. The base plate 10a can be configured to be slidable within a limited range along the central axis in the longitudinal direction of the light-shielding cylinder 6 as necessary, but may be fixed to the cylindrical member 6d. The sector plate 10c has a circular contour,
As shown in FIG. 1, a pin 10d protruding forward toward the center.
It has. By passing the pins 10d through holes provided at the centers of the base plate 10a and the lens holder 10b, the sector plate 10c and the lens holder 10b are rotatably supported by the base plate 10a.

In the illustrated embodiment, the photographic film 3 is equally divided into four sections of photographing frames and four frames are photographed. The base plate 10a is provided with a diaphragm at a position substantially corresponding to the center of each photographing frame. An opening 10e is formed. The lens holder 10b holds the photographing lens 11 at the same radial position as the stop aperture 10e of the base plate 10a with respect to the center of rotation. A finder opening 14 is formed at the upper right of the lens-equipped film unit 1 through the unit body 2 and the front cover 8 when viewed from the front. The finder opening 14 may be provided with a cross line so as to indicate a position corresponding to each photographing frame.

The sector plate 10c constitutes a shutter mechanism and has an arc-shaped slot 10f having an arc center at the center of the pin 10d. Also, the sector plate 10
c has an exposure opening 10g at the same radial position as the stop opening 10e with respect to the rotation center of the sector plate 10c. The lens holder 10b passes through the arc-shaped slot 10h formed in the base plate 10a and the sector plate 1
A projection 10i to be inserted into the slot 10f of Oc is formed. On the outer periphery of the sector plate 10c, locking projections 10j projecting outward in the radial direction at four locations at equal intervals in the circumferential direction.
Are formed.

A torsion spring 10k is wound around the pin 10d of the sector plate 10c. One end of the torsion spring 10k is locked to the sector plate 10c, and the other end is connected to the base plate 10a.
And is locked to the lens holder 10b through the slot 10h, and applies a rotational urging force in a direction indicated by an arrow in FIG. 1 to the sector plate 10c.

The base plate 10a has a shutter release lever 12 on the front side and a shutter locking lever 13 on the back side.
Are provided respectively. Shutter locking lever 13
Can rotate between a substantially horizontal position where one of the locking projections 10j of the sector plate 10c is locked and an upward position where the locking projection 10j is not locked with the locking projection 10j. As you go back, you are given a spring habit. The shutter release lever 12 is engaged with the shutter locking lever 13, and when pressed down, rotates the shutter locking lever 13 to the upward position.

FIG. 4 is a view for explaining the operation of the shutter mechanism. FIG. 4A shows a state in which a photographing frame at the lower right when viewed from the front is photographed. The shutter locking lever 13 is engaged with the locking projection 10j of the sector plate 10c, and prevents the rotation of the sector plate 10c in the direction of the arrow by the spring 10k. The projection 10i of the lens holder 10b is located at the upper end of the slot 10f of the sector plate 10c. here,
When the shutter release lever 12 is depressed, the shutter locking lever 13 moves the locking projection 1 of the sector plate 10c.
0j, the sector plate 10c is disengaged from the spring 10k.
By the urging force of (1), it rotates in the direction of the arrow and comes to the position of FIG. During this time, the exposure opening 10g passes over the aperture opening of the base plate 10a, and the first frame of the photographic film 3 is exposed.

In the position shown in FIG. 4B, the projection 10i provided on the lens holder 10b engages with the lower edge of the slot 10f of the sector plate 10c to prevent the sector plate 10c from rotating further. . Shutter release lever 1
When the shutter release lever 2 is released, the shutter locking lever 13 returns to the original substantially horizontal position. Here, when the lens holder 10b is rotated and the photographing lens 11 is placed at a position corresponding to the second frame of the photographic film 3, the locking projection 1 of the sector plate 10c is moved.
4j is engaged with the shutter locking lever 3 as shown in FIG. 4 (c), and the shutter mechanism is charged. After that, shooting can be performed by the same operation as described above. 4 (d), (e) and (f) show the shooting operation up to the fourth frame in order.

In this shutter mechanism, it is necessary to hold the lens holder 10b so that the lens holder 10b does not rotate during photographing. For this purpose, a projection 101 protruding rearward is formed on the periphery of the lens holder 10b. In the base plate 10a, recesses 10m for receiving the projections 10l are formed at four locations at intervals in the circumferential direction. The lens holder 10b is pulled out in the optical axis direction each time one frame is photographed, rotated, and the projection 101 is engaged with the next recess 10m.
At this time, the torsion spring 10k expands and contracts in the optical axis direction,
Makes operation easier.

In the illustrated shutter mechanism, the base plate 10a is not essential and may be omitted in some cases. For example, a black coating is applied to the back surface of the photographing lens 11 except for a portion corresponding to the aperture opening to form an aperture opening. Then, by engaging the pins 10d of the sector plate 10c with the lens holder 10b, the sector plate 10c can be supported by the lens holder 10b. The torsion spring 10k is attached so as to act between the lens holder 10b and the sector plate 10c. In the case of this configuration, the protrusion 1 of the lens holder 10b is used.
The recess 10m for receiving 0l is formed in the foremost cylindrical member 6d of the light shielding cylinder 6. In this configuration, the lens holder 10b
It is necessary to provide a means for preventing light leakage when the light is pulled out in the optical axis direction in the light shielding tube 6.

FIG. 5 is a front view of one embodiment of a film unit with a lens. In this embodiment, as the photographic film 3, a film on which a normal 135 type perforation 3a is formed is used. When this film is used, it is possible to perform automatic development processing using perforation in the development stage. The shooting area of the film 3 is a rectangle of approximately 3 to 4 when viewed from the front,
The shooting frame also has a similar rectangle. In the case of this shape, if the optical axis of the photographing lens 11 is matched with the center of the figure of the photographing frame,
The moving distance of the photographic lens 11 from the first frame to the second frame and the moving distance of the photographic lens 11 from the second frame to the third frame have different values. Therefore, it is difficult to link the rotation of the shielding plate 7 and the rotation of the lens holder 10b. In this case, the shielding plate 7 and the lens holder 10b are configured to rotate separately.

In the unit of this embodiment, when no image is taken, the light shielding tube 6 is in a reduced state as shown in FIG. In this case, the light blocking member 5 shown in FIG. 2 is in the inserted state. When shooting, pull out the light blocking member 5,
The light-shielding cylinder 6 is extended, and imaging is performed as described above.

FIG. 6 shows an example of using a film of another format. The photographic film 15 used in this embodiment has no perforation and has a photographing area 15a.
Is a square. Then, the square photographing area is divided into four equal parts to form photographing frames. If this film format is used, the moving distance of the taking lens 11 between the four frames becomes equal. Therefore, the lens holder 10
It becomes easy to link the rotation of b with the rotation of the shielding plate 7. FIG. 1 shows an example of an interlocking mechanism between the lens holder 10 b and the shielding plate 7. One end of an interlocking pin 10n that can expand and contract like a telescope is fixed to the shielding plate 7.
The telescopic pin 10n extends forward through an arc-shaped slot 10g formed near the periphery of the base plate 10a, and the tip is fixed to the lens holder 10b. Telescopic pin 10n
A coil spring 10p that works in the tension direction is arranged around the coil spring. With this telescopic pin 10n, the lens holder 1
When 0b is rotated, the shielding plate 7 also rotates in conjunction with it.
The lens holder 10b can be formed, for example, with a short lever-shaped operation knob in order to facilitate manual operation.

FIG. 7 shows still another example of the film format. FIG. 7A shows an example in which the film is divided into two upper and lower stages, each of which is a panorama-sized photographing frame. Fig. 7 (b)
Is an example in which the film is divided into two right and left frames. Fig. 7 (a) (b)
In any of the examples, the cutout of the shielding plate 7 is made semicircular. FIG. 7C shows an example in which the film is divided into six frames.

In any of FIGS. 7 (a), 7 (b) and 7 (c),
The shutter mechanism may have the structure shown in FIG. 4, and the length of the slot 10f formed in the sector plate 10c may be appropriately determined according to the film format. The number and position of the aperture openings 10e formed in the base plate 10a also correspond to the positions of the photographic frames on the film.

FIG. 8 shows an example of a film unit with a lens using a film format capable of taking six frames. FIG. 8A is a front view showing the unit body 20 with the front cover removed. In this example,
The front member 21 of the unit body 20 has six rectangular exposure openings arranged on a circumference centered on the central axis in the longitudinal direction of the light-shielding cylinder (not shown) such that the centers are located at equal intervals in the circumferential direction. 22. A finder opening 23 is formed in the upper right of the unit body when viewed from the front. As in the embodiment described above, a sheet-shaped unexposed photographic film 24 is loaded in the unit main body in advance.

In FIG. 8 (a), a shielding plate 25 attached to the rearmost tubular member of a light shielding cylinder (not shown) which can be extended and contracted along the central axis in the longitudinal direction has a fan-shaped notch 25a of about 60 °.
Having. The shielding plate 25 attached to the rearmost cylindrical member of the light-shielding cylinder is rotatable together with the cylindrical member. As shown in the figure, the shielding plate 25 is formed on the front member 21 of the unit body 20 for exposure. Only one of the openings 22 is exposed, and it can be positioned so as to block the other exposure openings.

In the unit of this embodiment, a shutter mechanism having a structure similar to that of the unit described above can be used. FIG. 8B shows an outline of the sector plate 26 used in the shutter mechanism. Sector board 26
May have a configuration similar to that of the above-described example, and includes an arc-shaped slot 26a having an arc center at the rotation center thereof and an exposure opening 26b. In the present example, the circumferential length of the slot 26a is about 60 ° as represented by the angle α. Otherwise, the shutter mechanism is the same as in the previous example.

In this embodiment, the unit body 20
The exposure opening 22 formed in the front member 21 does not necessarily have to be a quadrangle as shown in the figure, but can take any shape. For example, a heart shape as shown in FIG. 9 (a), a horizontally long ellipse as shown in FIG. 9 (b), a vertically long ellipse, a flower shape as shown in FIG. 9 (c), etc. Such a shape can also be adopted.

[Brief description of the drawings]

FIG. 1a is an exploded perspective view showing one embodiment of a film unit with a plate-like lens of the present invention.

FIG. 1b is an exploded perspective view showing details of a part of FIG. 1a.

FIG. 2 is an exploded perspective view showing an example of a structure of a unit main body in the unit shown in FIG.

3A and 3B are horizontal cross-sectional views of the film unit with a lens shown in FIG. 1, wherein FIG. 3A shows a contracted state of a light-shielding cylinder and FIG.

FIG. 4 is a schematic front view illustrating an operation of a shutter mechanism according to the embodiment of the present invention.

FIG. 5 is a front view of a unit according to the embodiment of the present invention.

FIG. 6 is a front view similar to FIG. 5, showing an example using another film format.

FIG. 7 is a schematic diagram showing examples of various film formats that can be used in the present invention.

8A and 8B show another embodiment of the film unit with a lens according to the present invention, wherein FIG.
(b) is a front view of the sector plate of the shutter mechanism.

FIG. 9 is a diagram showing examples of various shapes of an exposure opening formed on a front surface of a unit main body.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Film unit with a lens, 2 ... Unit main body, 3 ... Photo film, 5 ... Light shielding member, 6
... Shade tube, 7 ... Shield plate, 10 ... Lens and shutter mechanism

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G03B 15/00 G03B 15/00 H 17/02 17/02 G03C 3/00 575 G03C 3/00 575C

Claims (3)

[Claims] 1. A shutter mechanism for a photographing apparatus including a light-shielding cylinder having a longitudinal axis and a photographing lens disposed at a front end thereof, wherein the shutter mechanism is rotatable with respect to a base member having a diaphragm opening of the photographing lens. A sector plate that is supported by the light-shielding cylinder and has an exposure opening that passes through a position overlapping the aperture opening during rotation and exposes the photographic film, and for urging the sector plate in one rotation direction Urging means, locking means for preventing rotation of the sector plate against the urging force of the urging means, and a shutter release mechanism for releasing the rotation preventing action on the sector plate by the locking means. Rotation limiting means for limiting the rotation of the sector plate to a predetermined range under the action of the urging means when the rotation release action is released by the shutter release mechanism; A shutter mechanism, characterized in that it comprises. 2. The shutter mechanism according to claim 1, wherein a plurality of aperture openings are formed in the base member at equal intervals in a circumferential direction, and the rotation restricting means is formed in the sector plate. An arc-shaped slot and a pin member provided on the holding plate so as to be engaged with the arc-shaped slot, wherein the pin member of the holding plate has a predetermined length not exceeding a circumferential interval between two adjacent aperture openings. When the sector plate rotates by a distance of, the sector plate is engaged with the end of the arc-shaped slot to prevent the sector plate from rotating, and the holding plate does not rotate at all times. Although supported by the light-shielding cylinder, it can be rotated in the biasing direction of the biasing means to release the blocking effect on the rotation of the sector plate.
A shutter locking member for preventing rotation of the sector plate under the biasing force of the biasing means when rotated by an angle corresponding to a circumferential interval between two adjacent aperture openings, A shutter mechanism, wherein the shutter release mechanism includes a member that releases a locking action of the shutter locking member. 3. The shutter mechanism according to claim 2, wherein said sector plate and said holding plate are arranged so as to be coaxially rotatable.