JP2004093882A - Optical adapter for film unit with lens - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical adapter which can be efficiently assembled. <P>SOLUTION: The optical adapter 10 is constituted of a fixed frame 11 which is fitted to the front of a film unit 1 with a lens and a movable frame 12 to which a cylindrical lens 13 is fitted and which is freely turnable about the fixed frame 11. The fixed frame 11 is loaded by being pressed in the front of the film unit 1 with the lens and covered as the movable frame 12 is closed. A press rib 26 is provided on the internal surface of the movable frame 26 and the optical adapter 10 can be assembled by pressing the fixed frame 11 against the film unit 1 with the lens with the movable frame 26 closed. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an optical adapter for a film unit with a lens that can easily switch between standard photography and special effect photography.
[0002]
[Prior art]
An unexposed photographic film is loaded in advance, and a lens-fitted photo film unit capable of taking a photograph on the spot is known. The lens-equipped film unit is inexpensive and easy to use, and you can enjoy taking pictures with simple operations. In addition, a dedicated optical adapter is sold separately so that this film unit with a lens can be used for various purposes. Examples of the optical adapter include a telephoto adapter suitable for photographing during sports watching and a close-up adapter for photographing a subject at a short distance.
[0003]
As described in Japanese Patent Application Laid-Open No. 8-15763, a conventional optical adapter is composed of an adapter main body to which an auxiliary lens is attached and a rubber cord for fixing the adapter main body to a lens-fitted photo film unit. This optical adapter has the advantage that it can be attached to the film unit with a lens without providing a special mounting portion, because the rubber cords stretched around the film unit with the lens are respectively locked on the top and bottom of the adapter body. is there.
[0004]
The optical adapter described in the above publication can be widely used for lens-fitted photo film units with different appearance designs, but it is troublesome for the user to remove the adapter and to carry the optical adapter separately when not in use. There is inconvenience in handling. Therefore, there has been proposed an optical adapter that can be easily switched between special photographing using an auxiliary lens and standard photographing using only a photographing lens, and is assembled in advance when a film unit with a lens is manufactured. This optical adapter consists of a fixed frame attached to the front of the lens-fitted photo film unit and a movable frame that holds the auxiliary lens and is rotatable with respect to the fixed frame. You can switch between shooting.
[0005]
[Problems to be solved by the invention]
In the above-described openable optical adapter, it is assumed that the movable frame is displayed in the store with the movable frame closed, and the appearance of the movable frame closed is important. For this reason, it is considered to cover the fixed frame with a movable frame to avoid complication of the appearance. Therefore, the movable frame needs to be formed in a size surrounding the fixed frame.
[0006]
The simplest way to install an optical adapter with such a configuration is to push the assembled optical adapter into the lens-fitted photo film unit, and the assembled optical adapter can be used with the movable frame closed. It is more convenient to handle. However, in a state where the fixed frame is covered with the movable frame, it is necessary to open the movable frame once in order to push in the fixed frame, and the opened movable frame must be closed after the assembly is completed, which takes time and effort. There is a problem.
[0007]
The present invention has been made in view of the above circumstances, and provides an optical adapter for a film unit with a lens that can be easily assembled by pushing the movable frame even when the movable frame surrounds the fixed frame. With the goal.
[0008]
[Means for Solving the Problems]
To achieve the above object, the present invention provides a fixed frame provided with an engaging portion that is pushed into an adapter mounting position on the front surface of a lens-fitted photo film unit on which a photographing lens is exposed, and an optical component that gives a special effect to a photographed image. And is fixed to the fixed frame and is locked to the fixed frame at a position where the optical component and the photographic lens face each other, and covers the fixed frame in a state of being locked to the fixed frame. And a movable frame having a concealing shape. When the movable frame in a locked state is pressed toward the fixed frame on the front surface of the fixed frame or the inner surface of the movable frame, the back of the fixed frame is pressed against the front of the lens-fitted photo film unit with this pressing force, A protrusion for pushing the engaging portion into the adapter mounting position is provided to transmit the force for pushing the movable frame to the fixed frame.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
In FIG. 1, a lens-fitted photo film unit 1 has a photographing lens 2 exposed on the front surface, and is provided with a finder 3, a strobe light emitting unit 4, and a slide knob 5. A shutter button 6, a counter display window 7, and a charge completion display portion 8 are provided on the top surface, and a winding knob 9 is provided on the back surface. An optical adapter 10 is mounted on the front surface of the lens-fitted photo film unit 1.
[0010]
The optical adapter 10 includes a fixed frame 11 and a movable frame 12. The fixed frame 11 is fixed to the front surface of the lens-fitted photo film unit 1, and the movable frame 12 is pivotally attached to the fixed frame 11. A cylindrical lens 13 is attached to the movable frame 12. As shown also in FIG. 2, the movable frame 12 rotates between an open position where the photographing lens 2 is exposed and a closed position where the cylindrical lens 13 faces the photographing lens 2. When the movable frame 12 is opened, normal photographing with the photographing lens 2 can be performed, and when the movable frame 12 is closed, special effect photographing with the cylindrical lens 13 can be performed.
[0011]
In FIG. 2, the movable frame 12 is provided with an elastic piece 14. The elastic piece 14 has a claw portion at its tip, and is locked by a claw stop portion 15 formed on the periphery of the fixed frame 11. The movable frame 12 is hooked on the corner of the fixed frame 11 in the process of closing. When the movable frame 12 is locked to the fixed frame 11, the fixed frame 11 is covered with the movable frame 12. An opening knob 16 is provided on the elastic piece 14. When the opening knob 16 is pulled forward, the elastic piece 14 rises, and the movable frame 12 locked to the fixed frame 11 can be opened.
[0012]
In FIG. 3, the movable frame 12 includes a front wall 19 having a curved shape curved in the front-rear direction and a side wall 20. The front wall 19 is provided with the elastic piece 14 and the adapter window 21 described above. The cylindrical lens 13 is exposed to the front surface of the movable frame 12 through the adapter window 21. When the movable frame 12 is closed, it is possible to perform shooting with a compression effect in the vertical or horizontal direction of the shooting screen.
[0013]
The fixed frame 11 is attached to the front surface of the lens-fitted photo film unit 1 without a gap by a central opening 22 formed in accordance with the peripheral shape of the photographing lens 2. A bearing portion 23 is provided below the central opening 22. On the back surface of the fixed frame 11, one mounting claw 24 is provided on each side. The attachment claw 24 is inserted into an attachment hole 25 formed on the front surface of the lens-fitted photo film unit 1.
[0014]
In FIG. 4, a pressing rib 26, a hinge shaft 27 fitted into the bearing portion 23, and a holding claw 28 that holds the cylindrical lens 13 are provided on the inner surface of the movable frame 12. The pressing rib 26 is integrally formed on the inner surface of the front wall 19 and the inner surface of the side wall 20. The pressing rib 26 has a height that comes into contact with the front surface of the fixed frame 11 when the movable frame 12 is closed and is further pushed toward the fixed frame 11, and the pressing rib 26 has a height that contacts the front surface of the fixing claw 24. It is provided in the position which presses a front surface, respectively.
[0015]
Next, the operation of the present invention will be described with reference to FIG. When the optical adapter 10 is assembled to the lens-fitted photo film unit 1, the optical adapter 10 is conveyed with the movable frame 12 closed. To assemble the optical adapter 10, the movable frame 12 is held, the back surface of the fixed frame 11 is directed to the front surface of the lens-fitted film unit 1, and the mounting claw 24 is aligned with the mounting hole 25. As shown in FIG. 5A, the mounting claw 24 is deformed at the same time as the mounting claw 24 is inserted into the mounting hole 25, and the reaction force by the mounting claw 24 pushes the fixed frame 11 back toward the movable frame 12.
[0016]
The fixed frame 11 is pushed back toward the movable frame 12. Immediately thereafter, the pressing rib 26 contacts the front surface of the fixed frame 11. The force for pushing the movable frame 12 is transmitted to the front surface of the fixed frame 11 through the pressing rib 26, and the attachment claw 24 is inserted into the attachment hole 25 while being deformed.
[0017]
As shown in FIG. 5 (b), when the mounting claw 24 is completely inserted into the mounting hole 25, the fixing frame 24 is prevented from coming off by the mounting claw 24, and the back surface of the fixing frame 11 is placed on the front surface of the lens-fitted film unit 1. Pressed. When the fixed frame 11 is thus attached to the lens-fitted photo film unit 1, the movable frame 12 remains closed, so that the assembly of the optical adapter 10 is completed.
[0018]
In the above embodiment, the cylindrical lens is attached to the movable frame. However, lenses and filters for other uses such as a telephoto lens, a close-up lens, and a soft focus lens may be attached, and the present invention is an optical that is attached to the movable frame. The type of parts is not limited.
[0019]
Moreover, in the said embodiment, although the protrusion part is provided in the movable frame side formed in the curved surface shape and thickness, if the thickness of a movable frame is small, you may provide a protrusion part in the fixed frame side. It is only necessary to be able to convey the power from the fixed frame. The projecting part provided on the fixed frame side does not project locally considering the appearance when the movable frame is opened, but the projecting part with a slight height difference on the front surface of the fixed frame gives the pushing force of the movable frame. It is good to tell. The projecting portion may be formed at a height that creates a gap with the fixed frame according to the distance from the edge of the movable frame at the locking position to the front surface of the lens-fitted photo film unit.
[0020]
As a means for attaching the fixed frame to the front surface of the film unit with a lens, press fitting or the like may be used in addition to the elastic claws. Further, the fixed frame and the movable frame may be made of a flexible material such as polypropylene resin, and may be integrally formed by a thin hinge.
[0021]
【The invention's effect】
As described above, the optical adapter for a film with lens of the present invention includes a fixed frame that is pushed into the film unit with a lens, and a movable frame that has a shape that holds the optical component and covers the fixed frame, Since the protrusion for transmitting the force for pushing the movable frame to the fixed frame is provided, there is no need to open the movable frame and directly push the fixed frame, and the adapter can be easily assembled while the movable frame is closed.
[Brief description of the drawings]
FIG. 1 is a perspective view of a lens-fitted photo film unit with a movable frame opened.
FIG. 2 is a perspective view of a lens-fitted photo film unit with a movable frame closed.
FIG. 3 is an exploded perspective view of the optical adapter.
FIG. 4 is a rear perspective view of the optical adapter.
FIG. 5 is an explanatory diagram showing a state when an adapter is attached.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Film unit with a lens 2 Shooting lens 10 Optical adapter 11 Fixed frame 12 Movable frame 13 Cylindrical lens 26 Pressing rib

Claims (1)

A fixed frame provided with an engaging portion that is pushed into the adapter mounting position on the front surface of the lens-fitted photo film unit with the photographic lens exposed;
The optical component for the adapter is held and pivotally attached to the fixed frame, and is fixed to the fixed frame at a position where the photographing lens and the optical component face each other. And a movable frame having a shape that covers the frame,
When the movable frame in a locked state is pressed toward the fixed frame by the protrusion provided on the front surface of the fixed frame or the inner surface of the movable frame, the fixed frame rear surface is moved to the front of the film unit with a lens by this pressing force. An optical adapter for a film unit with a lens, wherein the engaging portion is pushed into an adapter mounting position, and the fixing frame is attached to the front surface of the film unit with a lens.

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