JPH03196128A - Film integral type camera - Google Patents

Abstract

PURPOSE:To make the constitution of a shutter mechanism part concise and to reduce the cost of the camera, while maintaining a photographing function and accuracy required for practical use by constituting a member for reciprocating-driving a sector, of a shape memory alloy member, and reciprocating-driving directly the sector by utilizing the shape variation caused by a shape difference at the time of non-electric conduction and at the time of electric conduction. CONSTITUTION:A sector driving member 21 is formed by a shape memory alloy member having such a quality as the shape is varied by an electric conduction heating action. Subsequently, by utilizing the shape variation (dimension variation) generated by a difference of shapes at the time of non-electric conduction and at the time of electric conduction, a shielding state and an opening state of a sector 11 are realized. In such a way, while maintaining a photographing function and accuracy required for practical use, the constitution of a shutter mechanism part can be made concise, and a low cost required for this kind of film integral type camera can be realized.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention involves loading unexposed film into the camera body in advance, and then breaking the camera body itself after shooting all the frames to take out the exposed film inside. This relates to a type of film-integrated camera.

[Conventional technology]

This type of film-integrated camera is also commonly referred to as a ``disposable camera,'' but the feature of this camera is to simplify its configuration as much as possible while maintaining a certain level of shooting function and accuracy that can be used for practical purposes. Therefore, the camera body itself must be provided at a low price.

In order to achieve this feature, we fundamentally reconsidered the structure of the shutter mechanism, which requires many components among the shutter mechanisms in conventional regular cameras, and made it possible to create a film-integrated camera as much as possible. We must devise a mechanism that meets the objectives of

By the way, the shutter mechanism of conventional ordinary cameras uses a drive mechanism called a charge type drive mechanism and a drive mechanism called a non-charge type. In the case of a charging type, an electromagnetic magnet is usually used, and in the case of a non-charging type, a stepping motor, a DC motor, etc. are usually used.

[Problem to be solved by the invention]

However, these actuators have problems such as unstable operation at the initial stage of operation, the need to flow a large current, and further problems that their manufacturing cost is high and the configuration space is large. .

This invention was made in view of the above circumstances,
The objective is to provide a new film-integrated camera that can simplify the configuration of the shank mechanism and realize the desire for lower costs while maintaining the photographic functions and accuracy required for practical purposes. shall be.

[Means to solve the problem]

In order to achieve this object, the present invention has developed a film-integrated camera in which the camera itself is broken and the exposed film inside is taken out after all frames have been photographed. The shutter is constructed of a shape memory alloy member that has the property of changing its shape, and uses the amount of shape change (dimensional change) caused by the difference in shape between the shape memory alloy member when it is not energized and when it is energized to directly change the shape of the shutter. It is configured to drive the blades back and forth.

〔Example〕

Next, the present invention will be described based on an embodiment shown in the accompanying drawings.

In FIG. 1, reference numeral 1 denotes the camera of the present invention, which is equipped with a photographing lens 3 at the approximate center of the front surface of the main body 2, a see-through finder 4 at the upper right section when viewed from the front, and a film winding knob on the left side. 5. Shank release member 6 on the top surface
are provided for each.

The film winding knob 5 is configured to wind the roll film (not shown) loaded in the main body 2 one frame at a time by rotating in one direction, but is not designed to perform shunter charging. .

In FIGS. 2 to 4, 11 is a shutter blade, and the base 11a of the shutter blade 11 is rotatably supported by a support shaft 12 implanted in a fixed part of the main body 2, and its reciprocating rotational movement is At this time, the shielding portion 11b is configured to be able to shield and open the rear optical path of the photographic lens 3. An operating protrusion 11c extending upward is formed on the base 11a of the shutter blade l111, and the amount of protrusion is determined as appropriate.

Reference numeral 3 is a spring for applying a biasing force in the counterclockwise direction to the shutter blades all, and reference numeral 14 is a stopper for setting the position of the shutter blade 11 when the optical path is blocked.

Reference numeral 2I denotes a shutter blade driving member for reciprocating the shutter blade 11, and the driving member 21 is formed using a shape memory alloy material that has the property of changing its shape by the action of heating with electricity, for example, the property of shortening when electricity is applied. ing. The right end portion 21a of the shutter blade driving member 21 is fixedly attached to a fixed portion of the main body 2, and the left end portion 21b is configured to be movable in the left and right directions in the figure within a predetermined plane via appropriate support means. ing. Further, in a position near the left end portion 21b of the shutter blade drive member 21, there is a bent portion 2 having a structure that can engage with the left side surface of the operating protrusion 11c of the shutter blade 11.
2 is formed.

Therefore, when the shutter blade 11 is blocking the photographing optical path (when not energized), the right side surface 22'a of the bent portion 22 is moved through the slight gap P to the left side of the operating protrusion 11c of the shutter blade 11 (the position at the time of blocking). ), and when the shutter blade driving member 210 is energized and heated, the shutter blade 11 is heated by kicking the operating protrusion 11c using the amount of shape change (length change) caused by the difference (shape difference) from the length when not energized. The right end 21 of the shutter blade drive member 21 can be opened and closed.
The length from a to the right side surface 22a of the bent portion 22 is set in advance.

In addition, shunter blade drive member (shape memory alloy member) 2
An appropriate energization control circuit 31 is connected to 1, and is configured in advance so that when the exposure start switch S is closed by pressing the shutter release member 6, the shutter blade drive member 21 starts the energization heating action. ing.

With such a configuration, the shutter release member 6
When the shutter blade drive member 21, which is extended in the normal state (the state shown in the second figure), is energized by pressing the button, the shutter blade drive member 21 starts to be heated by electricity, and the shutter blade drive member 21 starts to contract in the direction of the arrow in FIG. do. At the beginning of this shortening movement, the right side surface 2 of the bent portion 22 of the shutter blade drive member 21
2a kicks the operating protrusion 11c of the shutter blade 11 to rotate the shutter blade 11 clockwise.

By the way, since the shape memory alloy member has the property of outputting the maximum power at the initial stage, the shutter blade 11 is pressed by this large force and is forced clockwise against the biasing force of the spring 13. It is rotated and displaced from the shielded position shown in the second figure to the open position shown in FIG.

In this case, while the shunter blade drive member 21 is energized, the bent portion 22 continues to hold the shutter blade 11 in the open position.

On the other hand, if the shutter blade drive member 21 is de-energized by, for example, stopping the pressing operation of the shutter release member 6, the member 21 will extend to its normal position. Therefore, the shack blade 11 is rotated counterclockwise by the biasing force of the spring 13, and returns to the shielding position as the shutter blade drive member 21 extends.

The shutter blade 11, which has finally returned to the shielding position where it contacts the stopper 14, is stopped at this position by the biasing force of the spring 13. That is, the exposure time of the shutter is the reciprocal displacement time from when the shutter blade 11 starts to move from the shielding position, passes through the open position, and returns to the shielding position again.

This exposure time is determined by the energization time to the shutter blade drive member 21, so the energization control circuit 310 energization time is determined in advance by #.
If the structure is configured so that the A section can be used, the exposure time can be made variable.

Note that in a film-integrated camera equipped with a self-timer (not shown), it is necessary to provide a necessary delay time between the time when the shutter release member 6 is pressed and the time when the shutter blade drive member 21 is energized. However, in such a case, the self-timer side or the energization control circuit 31
An appropriate delay time setting means is provided on the side.

As explained above, in the film-integrated camera 1 according to the present invention, the shutter blade drive member 21 is made of a shape memory alloy material that has the property of changing its shape by the action of heating with electricity.
The structure is configured so that the shielding state and the open state of the shutter blade 11 are realized by utilizing the amount of shape change (dimensional change amount) caused by the difference in shape between the shape memory alloy material when it is not energized and when it is energized. This eliminates the need to use conventional actuators (electromagnetic magnets, stepping motors, DC motors, etc.) that have various problems, and allows the configuration of the shutter mechanism while maintaining the photographic function and accuracy required for practical purposes. succeeded in simplifying.

As a result, we were able to achieve the low cost required for this type of film-integrated camera mentioned in the opening section.

〔Effect of the invention〕

As described above, the present invention is a film-integrated camera in which the camera itself is broken and the exposed film inside is taken out after all frames have been photographed, in which the shape of the member that drives the shutter blade back and forth is changed by the action of electrical heating. Although it is characterized by being constructed from a shape-memory alloy member with properties, it maintains the photographic function and accuracy required for practical use, simplifies the configuration of the shutter mechanism, and realizes the desire for cost reduction. It has an excellent effect of being able to do a lot of things.

[Brief explanation of drawings]

Fig. 1 is an external perspective view showing one embodiment of the present invention, Figs. 2 to 4 are schematic configuration diagrams showing the main structure of the shutter mechanism, and Fig. 2 shows the shutter blade in the shielding position. 3 is a plan view, and FIG. 4 is a front view when the shutter blade is in the open position. 1 - Camera of the present application 2 - Main body 3 - Photographic lens 4 - Transparent viewfinder 5 - Film winding knob Shutter release member Shutter blade a - Base b - Shielding part C - Operating protrusion support shaft spring 1 - Collar Shank-blade drive member bent portion energization control circuit Exposure start switch patent Applicant Konica Corporation Figure

Claims (1)

[Claims] In a film-integrated camera in which the camera itself is broken and the exposed film inside is taken out after all frames have been shot, the member that drives the shutter blade back and forth is made of a shape-memory alloy whose shape changes when heated with electricity. A film-integrated camera characterized by being constructed from parts.