JPH03130727A - Camera - Google Patents

Abstract

PURPOSE:To easily take a photograph in focus by alternatively switching and positioning a normal lens and a macro lens on a photographing optical path with a stop which demarcates a stop aperture for the normal lens and a stop for the macro lens whose aperture is smaller than the former one. CONSTITUTION:The macro lens 14 is fitted in front of the stop aperture 24 provided on a lens holder 23 and the normal lens 27 is fitted in front of the stop aperture 26 provided adjacently to the stop aperture 24. The stop aperture 24 deepens the depth of field of the lens 14 and the aperture thereof is made small in order to prevent over-exposure at the time of photographing with strobe light. By operating a switching knob 16, the holder 23 rotates counterclockwide by resisting against the energizing force of a toggle spring 41 and a sector part 30 abuts on a stopper 37, then the holder 23 is positioned and fixed between the spring 41 and the stopper 37. Thus, photographing magnification is easily switched and a beginner can easily take a photograph in focus.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a camera capable of switching from normal photography to close-up photography.

[Prior art] As a conventional simple camera, a film unit with a lens (Utsurun desu J series) is known. It is a disposable type camera that is set to focus from nearby to infinity. By using this, even beginners can easily enjoy photography.

[Problem to be solved by the invention]

However, with the above-mentioned camera, the subject appears small when approaching plants and flowers or photographing documents, and is not sufficient for photographing these subjects. In order to deal with this, if a camera with an extremely simple configuration as described above is provided with a close-up function, it will be possible to photograph areas that could not be photographed before, and it is thought that the product value will be further increased.

On the other hand, methods for taking close-up photographs using an acnotiment lens and cameras for taking close-up photographs by extending the photographing lens are known. However, with the former, it is inconvenient to take close-up shots unless you always carry an acumentation lens, and with the latter, the mechanism for extending the lens is complicated and costs are high. In order to use it for this purpose, further improvements were necessary.

[Purpose of the invention]

An object of the present invention is to provide a low-cost camera that can be switched to close-up photography, has a deep depth of field in the close-up photography mode, and allows even beginners to take photographs with peace of mind.

[Means to solve the problem]

In order to achieve the above object, the camera of the present invention includes a normal lens and a macro lens, an aperture that defines the aperture aperture of the normal lens, an aperture that defines the aperture aperture of the macro lens with an aperture smaller than this aperture, and the aperture that defines the aperture aperture of the macro lens. A switching means for selectively positioning the normal lens or the macro lens on the photographing optical path is provided.

Furthermore, it is also an effective solution to make the focal length of the macro lens shorter than the focal length of the normal lens.

[Effect]

According to the above, close-up photography is possible by retracting the normal lens from the photographing optical path and positioning the macro lens on the photographing optical path by the switching means. The aperture aperture of a macro lens is small (stopped down), which increases the depth of field when taking close-up shots, allowing even inexperienced users to take pictures with good focus.

In addition, by shortening the focal length of the macro lens,
When taking close-up shots, the lens is thick enough to allow close-up shots of documents and flowers.

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

〔Example〕

FIG. 4 does not show the lens-equipped film unit (hereinafter referred to as "film unit") 11 wrapped in the paper box 10. The paper box 10 is provided with an opening for exposing the lens and operating parts of the film unit 11, and is also printed with an indicator 8.9 indicating switching between macro photography and normal photography. A macro lens 14 is positioned within the opening 12 on the front surface of the film unit 11 on the photographing optical axis 13 .

At this time, the switching knob 16 is located at the right end in the slot 17, and the target mark 1 is in the finder 18.
is inserted. The target mark 19 is inserted into and removed from a hole 21 formed in the inner wall of the find tick 8 by operating the switching knob 16. A strobe light emitting section 22 is provided at the right end of the front surface. Reference numeral 20 denotes a strobe inch for charging before flashing the strobe, and when the shutter button 25 is pressed while pressing the strobe switch 20, it is possible to take a robot photograph.

As shown in FIG. 2, the macro lens 14 is fitted in front of an aperture 24 provided in a lens holder 23, and a normal lens 27 is fitted in front of an aperture 26 provided next to it.
are fitted. Thereby, the macro lens 14 and the normal lens 27 are arranged on the same plane.

For example, the macro lens 14 has a focal length of 33 mm and an F value of 27.
2 angle of view 59, focused subject distance 0. The normal lens 27 has a focal length of 35 mm, an F number of 11, an angle of view of 63°, and a focused object distance of 1.2 m-ω.

Here, the aperture aperture 24 is made small in order to deepen the depth of field of the macro lens 14 and to prevent overexposure during strobe photography.

The switching knob 16 is provided on the sector portion 30 at the bottom of the lens holder 23, and the guide member 28. A shaft member 29° and a target mark 19 are provided. A bin 38 is provided on the rear surface of the lens holder 23, as shown in FIG.

Macro lens 14. The normal lens 27 is shown in Figure 1 (A).
As shown in FIG. 2, they are arranged without any interval on either side of the center line connecting the shaft member 29 and the bottle 38.

As a result, the lens holder 23 can be made compact, and the stroke of the lens holder 23 when switching between macro and normal modes is reduced, which contributes to making the entire Kunari film unit 11 more compact. Furthermore, the location of the switching knob 16 is determined by the toggle spring 41.
Since it is located outside the pin 38 on which the biasing force acts, the switching operation becomes easy.

The upper part of the guide plate 31 that guides the rotation of the lens holder 23 has a notch 32. A stopper 33 is formed, and an opening 34 for exposing the film is opened in the center. The arcuate convex portion 36 guides the rotation of the lens holder 23 to smoothly switch lenses. Arc-shaped convex portion 36
A stone bar 37 is formed at the right end. A pin 39 is provided at the lower end of the guide plate 31. This pin 39 and the pin 38 of the lens holder 23 are connected to a toggle spring 41.
Lock one end of each.

Main body portion 4 equipped with patrone chamber 51 and shutter mechanism 52
A fixing plate 43 is disposed at the center of 2. This fixing plate 43 is formed with a recess 46 for securing a drive space for the shutter blade 44 and an opening 47 opened in the recess 46. Since a notch 48 is formed in the upper part of the fixed plate 43, the shaft member 29 passes through the notch 32 and the notch 48 and is supported by the bearing 49. A protrusion 53 is formed in the patrone chamber 51, and a protrusion 53 is formed in the main body portion 42.
A hook 56 is formed in the film roll chamber 54 at the right end. A cartridge chamber 51 contains a cartridge, and a back cover 55 is fixed in a film roll chamber 54 containing a film roll formed by pulling out a film from the cartridge in advance.

The strobe circuit board 57 having the strobe light emitting section 22 is
While engaging the left end engaging portion 58 with the protrusion 53,
It is attached to the main body part 42 by engaging the hook 56 through the L-shaped hole 59 in the center.

Hereinafter, the operation of this embodiment configured as described above will be explained.

First, when the switching knob 16 is operated in the direction of the index 9 during normal photography, the lens holder 23 pivots clockwise on the guide plate 31 about the shaft member 29, as shown in FIG. 1(B). This turning is performed smoothly by being guided by the guide member 28 and the arcuate convex portion 36. When the sector portion 30 comes into contact with the stopper 33, the clockwise rotation of the lens holder 23 is stopped, resulting in the state shown in FIG. At this time, since the lens holder 23 is urged toward the stopper 33 by the toggle spring 41, it is positioned between the stopper 33 and the toggle spring 41. Thereby, the normal lens 27 is positioned on the photographing optical axis 13. At this time, a subject of 1.2 m to ω can be photographed.

Next, when the switching knob 16 is operated in the direction of the index 8,
As shown in FIG. 1(A), the lens holder 23 rotates counterclockwise while resisting the urging force of the toggle spring 41. As shown in FIG. At this time, since the switching knob 16 is located outside the pin 38, it can be turned without requiring strong force, and the operation becomes easy. As the lens holder 23 continues to rotate counterclockwise, the toggle panel 41 will be removed from the inside.
The biasing force acts in a direction that helps counterclockwise turning. Then, as shown in FIG. 1(B), the rotation is stopped with the sector portion 30 in contact with the stopper 37. At this time,
The macro lens 14 is located on the photographing optical axis 13, the target mark 19 is inserted into the finder 18 through the hole 21, and in this state the lens holder 23 is fixed in position between the toggle spring 41 and the stopper 37. The target mark 19 is located at a position off the center of the field of view of the finder 18, indicates the center of the angle of view during macro photography, and is designed to represent the standard for vararax correction.

Further, by pressing the shutter button 25 while pressing the strobe switch 20, strobe photography can be performed. Since macro photography is performed when the subject is closer than about 1.2 meters, a strobe is effective. When performing strobe photography, overexposure may occur, but this can also be countered by making the diaphragm aperture 24 smaller.

Note that the present invention can be used not only for film units but also for simple cameras such as compact cameras.

[Effects of the Invention] As explained above, in the camera of the present invention, the normal lens and the macro lens are selectively moved in and out of the photographing optical path, so that the photographing magnification can be switched with an extremely simple configuration. It becomes possible to provide cameras. In addition, by making the aperture aperture smaller, the depth of field is deepened during close-up photography, making it easier for even beginners to get the shot in focus, and it also easily and effectively prevents overexposure caused by strobe photography. can do.

In addition, by shortening the focal length of the macro lens,
Sufficient photographic magnification can be obtained during close-up photography.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the operation of a film unit embodying the present invention. FIG. 2 is an exploded perspective view of a film unit embodying the present invention. FIG. 3 is a sectional view of a main part of the film unit shown in FIG. 2. FIG. 4 is an external view of the film unit shown in FIG. 2. 14 ・ 23 ・ 4 27 ・ 30 ・ 33° 38 ・ 41 ・ Macro lens lens holder 6... Aperture aperture normal lens sector section 7 ・ Stopper focus toggle spring. Figure 1 Figure 3 Figure 1

Claims (2)

[Claims] (1) Selecting between a normal lens and a macro lens, an aperture that defines the aperture of the normal lens, an aperture that defines the aperture of the macro lens with an aperture smaller than this aperture, and the normal lens or macro lens together with the aperture. A camera characterized in that it is provided with a switching means for automatically positioning the camera on a photographing optical path. (2) A normal lens and a macro lens with a shorter focal length are arranged side by side on a lens switching plate, and this switching plate has an aperture that defines the aperture of the normal lens, and a macro lens with an aperture smaller than this aperture. a diaphragm defining an diaphragm aperture, and switching means for moving the switching plate to selectively position the normal lens or the macro lens on the photographing optical path. .