JPH0627525A - Picture frame size changeover camera - Google Patents

Abstract

PURPOSE:To obtain a picture frame size changeover camera capable of taking a picture frame size changeover action by an easy operation, with a simple constitution. CONSTITUTION:The picture frame size changeover camera is equipped with masks 5 and 15 regulating a standard or panoramic size by turning and having magnetic substance parts, a picture frame size specifying means, springs 6 and 16 pressing the masks 55 and 15 in directions where they are separated from a film, a lens-barrel 2 moved to a collapsible position by the picture frame size specifying means and moving the masks 5 and 15 to standard size positions, electromagnets 7 and 17 disposed in locations corresponding to the magnetic substance parts on the camera main body and determining whether magnetic coupling to the magnetic substance parts can be attained by a current or not, and an electromagnet controlling means controlling the currents of the electromagnets 7 and 17, holding the magnetic coupling of the electromagnets 7 and 17 to the masks 5 and 15, when the standard size is specified, and releasing the magnetic coupling to regulate the standard or panoramic size by the masks 5 and 15, respectively, when the panoramic size is specified.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screen size switching camera, and more particularly to a screen size switching camera which uses a roll film and switches the screen size by a screen size regulating means arranged near the aperture.

[0002]

2. Description of the Related Art Conventionally, in Japanese Utility Model Application Laid-Open No. 3-84821 and Japanese Patent Application No. 3-155, a camera body has a screen size switching mechanism provided with a magnet, and a collapsing operation of a lens barrel is used. Technical means for operating the switching mechanism have been proposed.

[0003]

However, in the above-mentioned prior art, the screen size switching operation is performed manually, and the screen size switching mechanism also has a complicated structure in which a connecting member or the like is frequently used. It was This leads to an increase in cost and space, and further a design limitation.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a screen size switching camera having a simple structure and capable of performing a screen size switching operation by a simple operation.

[0005]

In order to achieve the above object, a screen size switching camera according to the present invention is arranged in the vicinity of the front surface of a film, and rotates to regulate the first or second screen size. A screen size restricting means having a magnetic material part at least in part, a screen size specifying means for specifying the first or second screen size, and a biasing means for biasing the screen size restricting means in a direction away from the film. A position for moving the first screen size to the retracting position corresponding to the information from the biasing means and the screen size designating means, and for moving the screen size regulating means against the biasing means by the movement. And a movable lens barrel to move to
An electromagnet, which is arranged at a position corresponding to the magnetic body portion in the screen size regulating means of the camera body, and determines whether magnetic coupling with the magnetic body portion is made by an electric current, and current control of the electromagnet is performed. When the first screen size is designated by the screen size designating means, magnetic coupling between the electromagnet and the screen size regulating means is maintained and the screen size regulating means regulates the first screen size. In addition, when the second screen size is designated, the magnetic coupling is released to limit the second screen size to the second screen size.

[0006]

In the present invention, the movable lens barrel moves to the retracted position in accordance with the information from the screen size designating means, and the movement of the movable lens resists the urging force of the urging means to regulate the screen size. The means moves to the position for regulating the first screen size, and the electromagnet and the magnetic body portion of the screen size regulating means magnetically couple with each other. Then, when the first screen size is designated by the screen size designating means, the electromagnet control means holds the magnetic coupling between the electromagnet and the screen size regulating means, and the screen size regulating means makes the Restrict to the first screen size. Further, when the second screen size is designated, the magnetic coupling is released and the second screen size is restricted.

[0007]

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

FIG. 1 is an enlarged perspective view of an essential part showing a main part of a screen size switching camera according to a first embodiment of the present invention, and FIG. 2 shows (a) of the camera according to the first embodiment. 4A and 4B are side cross-sectional views of a main portion showing a normal state, a retracted state, and a standard photographing state, respectively.

Inside the camera body 3 (see FIG. 2), behind the lens barrel 2 in which the photographing optical system 1 is installed, an aperture 3a for determining the photographing angle of view of the loaded film 8 (see FIG. 2). Are formed. And this aperture 3
The screen size regulating members 5 and 15 are attached to the upper and lower portions in the vicinity of the front part of the camera body in a vertically symmetrical manner by a rotating shaft 9 fixed to a predetermined position of the camera body 3. In FIG. 2, reference numeral O is an optical axis, reference numeral 4 is a pressure plate for pressing the film 8, and a rack portion 2b (see FIG. 2C) is formed on the lower surface of the lens barrel 2. hand,
The lens barrel 2 is movable back and forth by a pinion of a motor 19.

The screen size restricting members 5 and 15 are provided with strip-shaped mask portions 5a and 15a, respectively, and projecting portions 5b and 15b are provided on one side of the front end portions of the mask portions 5a and 15a, respectively. The mask portions 5a and 15a are formed integrally with each other at a predetermined angle in a "V" shape. Rotation fulcrums 5d and 15d are formed on both sides of the front ends of the mask portions 5a and 15a, and the screen size regulating members 5 and 15 rotate the rotation support portions 5d and 15d. Axis 9
It is rotatably pivoted to. As a result, the screen size regulating members 5 and 15 together form a lever with the pivot shaft 9 as a pivot. The screen size regulating members 5 and 15 are made of a magnetic material.

Further, projecting pieces 5c and 15c are provided on the projecting portions 5b and 15b, respectively.
Springs 6 and 16 for urging the projecting portions 5b and 15b in the vertical direction are provided between c and 15c and a predetermined position inside the camera body. As a result, the mask portions 5a and 15a rotate in the downward and upward directions, that is, in the direction away from the film 8 loaded in the vicinity of the aperture 3a.

Further, at a position on the camera body 3 which faces the mask portions 5a, 15a, that is, on the extension of the turning locus of the mask portions 5a, 15a, a repulsive type connected to a power source (not shown). Electromagnets 7 and 17 are provided. The electromagnets 7 and 17 are electromagnets in which a coil is wound around a permanent magnet, and the mask portion 5a, which is normally a magnetic body,
Although the strength of the magnetic pole is maintained in the direction in which 15a is attracted, the strength of the magnetic pole is offset when a current is supplied from the power source at the timing described later. The mask portions 5a and 15a are repulsed by the biasing forces of the springs 6 and 16 in the direction away from the electromagnets 7 and 17. The strength of the magnetic poles of the electromagnets 7 and 17 at all times is greater than the biasing force of the springs 6 and 16.

When the lens barrel 2 is in the retracted position shown in FIG. 2 (b), the protrusions 5b and 15b are pushed to the opposite positions 2a and 12a on the rear surface of the lens barrel 2, whereby The mask portions 5a, 15a are the electromagnets 7, 17
And is magnetically coupled to be adsorbed. At this time, the shooting angle of view of the film 8 is set to the standard size.

FIG. 3 is an external perspective view of the first embodiment.

As shown in the figure, a power switch 21, a release button 22, and a panorama switching button 23 of the camera are arranged on one side of the upper surface of the camera body 3, and at the center of the upper surface of the camera body 3. Is provided with a panoramic liquid crystal display unit 24. Then, the panorama switching button 23
By pressing, the screen size regulating members 5 and 15 are moved to set the photographing screen size to the panoramic size as described later, and further, the “PANORAMA” display as shown in the figure is displayed on the panoramic liquid crystal display unit 24. It has become so.

Next, the operation of the first embodiment will be described.

First, when the power switch 21 (see FIG. 3) provided on the upper surface of the camera body 3 is operated to bring the camera into an operating state, the lens barrel 2 is moved to the motor 19.
(See FIG. 2 (c)), it is extended from the retracted position shown in FIG. 2 (b) to the shooting preparation position shown in FIG. 2 (c).
At this time, the screen size regulating members 5 and 15 are held in the state shown by the solid line in the figure while being magnetically coupled to the electromagnets 7 and 17. Therefore, the shooting screen size is the standard size. When the release button 22 is pressed in this state, the lens barrel 2 is further extended and the shutter is released. The lens barrel 2 then returns to the shooting preparation position again.

When the panorama size is designated by pressing the panorama switching button 23, current flows from the power source (not shown) to the electromagnets 7 and 17 at the same time, and the electromagnets 7 and 1 are connected.
The magnetic pole strengths of the permanent magnets of No. 7 are offset. This allows
The screen size regulating members 5 and 15 are rotated in a direction away from the film 8 by the urging force of the springs 6 and 16 and are positioned in a state indicated by a chain double-dashed line in FIG. 2C. At this time, the screen size restricting members 5 and 15 have the aperture 3a.
It covers the upper and lower parts of the image, so the shooting screen size is a panoramic size. Then, "PANARAMA" is displayed on the panoramic liquid crystal display unit 24.

When the standard size image is taken again, the panorama switching button 23 is pressed again. As a result, the lens barrel 2 is collapsed, and the protrusions 5b and 15b are pressed by the predetermined positions 2a and 12a on the rear surface of the lens barrel 2, and thus the screen size regulating members 5 and 1 are arranged.
Reference numeral 5 rotates to the standard size position described above, and retracts from the optical path. At this time, since the screen size regulating members 5 and 15 are made of a magnetic material, the mask portions 5a and 15a and the electromagnets 7 and 17 are magnetically coupled to each other, and this state is maintained. After that, the lens barrel 2 is again moved to the standard photographing position for photographing. Further, when performing photography in a panorama size, the above-described operation is repeated again.

As described above, in the first embodiment, the retractable type single focus camera is taken as an example. However, the present invention is not limited to this, and the screen size regulating members 5 and 15 are used when the focusing operation is performed with the retracted position as the photographing preparation position. The size may be changed so that the standard size is changed to the panoramic size.

A retractable zoom camera having a focus motor in the lens barrel may be used.

Further, the screen size regulating members 5, 15
Is entirely made of a magnetic material, but it is sufficient that at least only the positions facing the electromagnets 7 and 17 are made of a magnetic material, that is, only the mask portions 5a and 15a are magnetic materials, and the others. The portion may be formed of a non-magnetic material such as plastic.

On the other hand, in the first embodiment, switching between the standard size and the panorama size is taken as an example, but the present invention is not limited to this, and for example, the standard size and the half size, or the standard size and the larger size than the standard size. It may be applied to a mechanism for switching the size of the shooting screen.

According to the first embodiment, it is possible to provide a photographing screen size switching camera which has a simple mechanism and is easy to operate.

FIG. 4 is a side sectional view showing the main part of the screen size switching camera according to the second embodiment of the present invention, showing the upper half of the optical axis O.

In the second embodiment, the arrangement of the screen size restricting members 5 and 15 in the first embodiment and the relationship between the screen size restricting members 5 and 15 and the springs 6 and 16 are changed. . For simplification of the description, only the upper half of the optical axis O will be described.

As shown in FIG. 4, a screen size regulating member 5 '
Presents a lever similar to the screen size regulating member 5 in the first embodiment, one arm of which is the screen size regulating member 5.
The protrusion 5b 'is formed in a direction opposite to the protrusion 5b. In addition, a spring 6 ′ similar to that of the first embodiment is hooked between the other arm tip portion of the screen size regulating member 5 ′ and a predetermined portion of the camera body 3, and the screen size regulating member 5 ′. 'The other arm is biased upward. Further, an electromagnet 7 equivalent to that of the first embodiment is arranged at a predetermined position of the camera body 3 above the free end of the other arm of the screen size restricting member 5 '. 'Is magnetically coupled when they are in the vicinity.

On the other hand, the lens barrel 2'is formed with a rearward protruding portion at the upper and lower portions of the rear surface, and the protruding portion 5b 'of the screen size regulating member 5'is directed rearward at the protruding portion. It is designed to be pressed. When the lens barrel 2'is in the retracted position shown in FIG. 4 (a), the screen size regulating member 5'is in the panoramic size position as shown against the biasing force of the spring 6 '. It is supposed to be arranged. Also, the lens barrel 2'is shown in FIG.
When in the photographing preparation position shown in (b), the screen size regulating member 5'is arranged at the standard size position as shown by the biasing force of the spring 6 '. At this time, depending on the presence / absence of the electric current supplied to the electromagnet 7, it is rotated in the same manner as in the first embodiment, and the standard size or panoramic size is imaged.

According to the second embodiment, the same effect as that of the first embodiment can be exhibited.

[0030]

As described above, according to the present invention, it is possible to provide a screen size switching camera having a simple structure and capable of performing a screen size switching operation by a simple operation.

[Brief description of drawings]

FIG. 1 is an enlarged perspective view of essential parts showing a main part of a screen size switching camera that is a first embodiment of the present invention.

FIG. 2 is a side sectional view of a main part showing (a) a normal state, (b) a retracted state, and (c) a shooting standard state of the screen size switching camera of the first embodiment.

FIG. 3 is an external perspective view of the screen size switching camera of the first embodiment.

FIG. 4 is an enlarged side sectional view of a main part showing a main part of a screen size switching camera which is a second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Photographic lens 2 ... Lens barrel 3 ... Camera body 3a ... Aperture 4 ... Pressure plate 5,15 ... Screen size control member 5a, 15a ... Mask part 5b, 15b ... Projection part 6, 16 ... Spring 7, 17 ... Electromagnet 8 … Film 9… Rotary axis agent

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masaharu Hamada 2-43-2 Hatagaya, Shibuya-ku, Tokyo Inside Olympus Optical Co., Ltd.

Claims (1)

[Claims] 1. A screen size regulating means having a magnetic material portion at least in part, which is disposed near the front surface of the film and regulates the first or second screen size by rotation, and the first or second aspect described above. 2 screen size designating means for designating the screen size, biasing means for biasing the screen size regulating means in the direction of separating from the film, and moving to the retracted position corresponding to the information from the screen size designating means. At the same time, the movable lens barrel for moving the screen size regulating means to the position for regulating the first screen size by the movement against the biasing means, and the magnetic body in the screen size regulating means of the camera body. An electromagnet which is disposed at a position corresponding to the magnetic field and determines whether or not magnetic coupling with the magnetic body section is made by an electric current; Therefore, when the first screen size is designated, the magnetic coupling between the electromagnet and the screen size restricting means is maintained so that the screen size restricting means restricts the screen size to the first screen size. A screen size switching camera, comprising: electromagnet control means for releasing the magnetic coupling to regulate the second screen size when the second screen size is designated.