JPH0583746U - Multifocal lens for integrated film camera - Google Patents

Abstract

(57) [Summary] [Objective] An object of the present invention is to provide a simple, low-cost multifocal lens for a film-integrated camera. [Structure] A single lens 5 is provided with a plurality of lens portions 6 and 7 having different focal lengths, and by switching the light shielding member 8, either one of these lens portions 6 and 7 can be selected to transmit light. The light-shielding member 8 and the light-shielding portion 9
0 is formed, and when the lens barrel 4 is moved back and forth for telephoto shooting or wide-angle shooting, the light shielding member 8 is switched,
Light is transmitted only from the lens portion 6 or 7 that matches the set focal length.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a multifocal lens having a simple structure, and more particularly to a multifocal lens for a single-use type film-integrated camera.

[0002]

[Prior Art]

 Generally, a film-integrated camera is a compact, lightweight product that is configured by incorporating various functions required for shooting, such as a lens, shutter release button, and hoisting mechanism, in a film-loaded housing. In addition, because it is extremely inexpensive, it is rapidly becoming a popular single-use camera. Along with this spread and expansion, demands for higher functionality in film-integrated cameras have begun to rise in recent years. In other words, the emergence of a film-integrated camera that has high-class functions such as telephoto shooting and wide-angle shooting has been desired. For example, Japanese Laid-Open Patent Publication No. 3-233533 discloses a film-integrated camera that achieves two focal points by removing the lens barrel and inserting it in the opposite direction.

[0003]

[Problems to be solved by the device]

 However, when achieving more sophisticated shooting functions such as the above-mentioned telephoto and wide-angle functions, the more multifunctional it is, the more difficult it is to achieve compatibility with the simple structure and low cost that are the characteristics of film-integrated cameras. Become. For example, in a normal camera, a tele-converter lens is inserted behind the wide-angle lens to achieve wide-angle and telephoto two-focal points, or two lenses, wide-angle and telephoto, are attached to the camera and the lens is used for shooting. Although it is possible to set the focal point to two by switching to either of them, both of the above two methods are not preferable in the case of a film-integrated camera because they complicate the structure and increase the cost. In this respect, the above-mentioned Japanese Patent Laid-Open No. 3-233533 has one lens and achieves two focal points by changing the mounting direction, which realizes multi-functionalization without increasing the cost. However, in the case of this invention, it was necessary for the user to replace the lens, which is the main component of the camera.

In view of the above problems, it is an object of the present invention to make a lens multifocal without impairing the features of the film-integrated camera that are simple and low cost.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention provides one lens body with a plurality of lens portions having different focal lengths, and when the focal length is set, only the lens portion having the set focal length transmits light. By covering this part with a light-shielding member, we decided to make the lens of the film-integrated camera multifocal simply and at low cost.

[0006]

【Example】

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

In FIG. 4, reference numeral 1 denotes a main body of a film-integrated camera, and the main body 1 is composed of a plastic housing, and inside thereof, a spool chamber and a cartridge chamber, and a film 12 (see FIGS. 1A and 1B). )), And the outer surface is covered with a paper carton printed with the specified design. A shutter release button 2 is provided on the upper surface of the main body 1, and by pressing the shutter release button 2, a charged shutter (not shown) can be operated.

On the back surface of the main body 1, a hoisting gear 3 is provided so that a part of the hoisting gear 3 is exposed. By turning the hoisting gear 3, the film 12 after taking a picture is wound up. A lens barrel 4 is provided on the front surface of the main body 1, and has a lens 5 as shown in FIGS. 1A and 1B and a light shielding member 8 as shown in FIG. It constitutes the imaging system. The lens barrel 4 can be projected / retracted depending on whether wide-angle shooting or telephoto shooting is performed, and the back focus f1 and f2 of the lens 5 can be switched.

As shown in FIG. 2, the lens 5 has a wide-angle lens surface 6 having a deep lens curvature formed at the center thereof and a telephoto lens surface 7 having a shallow lens curvature formed around the wide-angle lens surface 6.

As shown in FIG. 3, the light blocking member 8 is composed of two light blocking plates 8 a and 8 b made of a flat transparent member and a support member 11 for supporting and connecting them. It is rotatably attached to the front surface of the lens 5. One of the light shielding plates 8a has a light shielding portion 9 made of a light shielding material at the center thereof, which has a diameter substantially the same as that of the wide-angle lens surface 6 of the lens 5, and the other light shielding plate 8b forms the lens 5. A light-shielding portion 10 made of a light-shielding material is applied and formed at a position corresponding to the telephoto lens surface 7 like the light-shielding portion 9.

Further, the support rod 11 of the light shielding member 8 is connected to the main body 1 by a connecting mechanism (not shown), and is adapted to rotate following the back-and-forth movement of the lens barrel 4. . Specifically, when the lens barrel 4 is pulled out and set to the telephoto side as shown in FIG. 1B, the light shielding plate 8a is rotated so as to come to the front surface of the lens 5 and When the lens covers the wide-angle lens surface 6 of the lens 5 and transmits light only from the telephoto lens surface 7, while the lens barrel 4 is set back to the wide-angle side as shown in FIG. A light shielding plate 8b is arranged on the front surface of the lens 5, and a light shielding portion 10 covers the periphery of the lens 5, that is, the telephoto lens surface 7, and transmits only the light of the wide-angle lens surface 6.

Therefore, for wide-angle photography, the lens barrel 4 is retracted into the main body 1 to set the focal length to f1. As shown in FIG. 1A, the light shielding plate 8b is located in front of the lens 5 and transmits light from the wide-angle lens surface 6 of the lens 5 to form a wide-angle image on the film 12. In the case of telephoto shooting, when the lens barrel 4 is pulled out, the focal length becomes f2 (see FIG. 1B), and at the same time, the light shielding plate 8a is positioned in front of the lens 5, and the telephoto side lens surface 7 of the lens 5 A more telescopic image is formed on the film 12 by transmitting more light.

With this, one lens has a function of two focal points of wide angle and telephoto, and it is possible to change the focal length and at the same time allow light to pass through only the lens matching the focal length, which is simple and inexpensive. It is possible to realize a high-performance dual-focus shooting without compromising the advantage of the film-integrated camera.

Further, in the above-described embodiment, since the lens center portion is set for wide angle and the lens peripheral portion is set for telephoto, the F-numbers at wide angle and telephoto can be made equal, and in practical use. The merits of can be increased. Further, since the light shielding member 8 is arranged in front of the lens 5, it is possible to prevent the lens 5 from being touched by a finger or the like. In the above embodiment, the case of two focal points has been described, but the lens 5 can be divided into three lens portions and divided into three focal points, or further divided into a plurality of focal points to obtain a multi focal point. Further, the division of the lens 5 is not limited to the concentric circle shape, and it may be divided into upper, lower, left, right and the like.

Although the lens 5 is used alone in the above embodiment, it may be used as one of a plurality of lenses forming the optical system. In particular, if it is used as one element in a zoom lens, the variable power range can be expanded and a great effect can be obtained.

[0016]

[Effect of the device]

 As described above, according to the multifocal lens of the present invention, a plurality of lens portions having different focal lengths are formed on one lens, and when one focal length is selected, a lens portion other than the lens portion having the selected focal length is formed. By blocking the parts with a light blocking member, multi-focus shooting is possible with a single lens, and it is possible to realize a multifunctional film-integrated camera with a simple structure and without increasing costs. It has the excellent effect of being able to expand

[Brief description of drawings]

1A and 1B are schematic views showing a camera in a wide-angle shooting state and a telephoto shooting state, respectively.

FIG. 2 is a sectional view of an embodiment of a multifocal lens according to the present invention.

FIG. 3 is a front view of a light blocking member.

FIG. 4 is an overall view of a film-integrated camera.

[Explanation of symbols]

 1 main body 2 shutter release button 3 winding gear 4 lens barrel 5 lens 6 wide-angle lens surface 7 telephoto lens surface 8 light-shielding member 9 light-shielding portion 10 light-shielding portion 11 support rod 12 film

Claims (1)

[Scope of utility model registration request] 1. A light shield in which a plurality of lens portions having different focal lengths are provided in one lens body, and a light transmitting portion for transmitting only a lens portion having the same focal length among the lens portions is formed for each lens portion. A multifocal lens for a film-integrated camera, characterized in that members are switchably attached to each lens portion, and the light shielding member is switched according to the set focal length according to the setting of the focal length.