JP3197335B2 - Camera that enables suitable close-up photography - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a simple camera capable of performing close-up photography in addition to photography at a normal distance.

[0002]

2. Description of the Related Art Conventional general cameras, except for special ones, cannot easily photograph a subject within a short distance, for example, within 1 meter, particularly within 80 cm, with good focus. On the other hand, objects photographed by common cameras include ikebana, plants, still life,
Very many objects, such as figurines and babies' faces, are suitable for taking pictures at close range. Needless to say, these objects can be photographed sufficiently clearly if they are separated by 1 meter or more. However, the size of the object is small relative to the size of the frame, and it is common that standard-size prints are commonly used. Therefore, there was a problem that a powerful image could not be obtained.

[0003] The inconvenience of the conventional general camera for photographing at a close distance is due to the following three main reasons.

The first reason is that the amount of movement of the lens for focusing the optimum focus on the film increases rapidly as the distance becomes short, so that an adjustment mechanism is very necessary to enable photographing at the short distance. It is complicated and large. For example, in the case of a lens with a focal length of 35 mm, the amount of movement of the lens required to change the shooting distance from infinity to 1 meter is only 1.2 mm, but in order to cover this to 40 cm. Needs to be moved about 2.8 millimeters.

[0005] The second reason is that the depth of field becomes extremely shallow as the subject becomes closer, so it is necessary to accurately measure the distance to the subject at the time of photographing. Shooting requires a great deal of effort, often fails, and it is difficult for a general compact camera user to obtain satisfactory shooting results. Further, even when the auto-focus mechanism is used, there is a problem that a very large number of steps of focus adjustment processing are required during a short distance, resulting in an increase in cost.

A third reason is that even if accurate focus is achieved, images before and after the focus are rapidly blurred, and a result satisfactory to ordinary users cannot be obtained.

[0007]

SUMMARY OF THE INVENTION In view of the above-mentioned problems of the prior art, the main object of the present invention is to provide a simple camera such as a general popular-purpose camera and the like, even when a photographing object at a short distance is obtained. It is an object of the present invention to provide a camera which can easily capture an image with good focus.

[0008]

Means for Solving the Problems] Such object is achieved according to the present invention, selected solid a constant focus lens, a diaphragm mechanism, a strobe, a close-up mode for taking a predetermined nearby subject When the close-up shooting mode is selected, the lens is forcibly set to a position where the lens is focused on the close-range subject, and the aperture is The mechanism is set to a smaller aperture than usual, and a state in which the strobe emits light is allowed.
The range of the depth of field is determined by the flash emission of the subject.
This is achieved by providing a camera characterized in that the camera is set wider than the range in which the image can be taken .

[0009]

[0010]

In this way [action], for example, Te cameras odor using a fixed-focus lens for photographing a subject distance including infinity 1m beyond, the subject up to 1 meter from the free Kirito manually focus Use a general focus adjustment method, whether it is of the autofocus type, autofocus type, or fixed focus type. By moving and setting to the optimal point for close-up shooting determined at the time of design and emitting a strobe light, the depth of field can be deepened, with a simple structure, so that ordinary users can be satisfied It becomes possible to perform close-up photography.

[0011]

FIG. 1 is a block diagram showing the functional structure of a manual focus camera according to the present invention. This camera is of a manual focus adjustment type capable of obtaining a substantially proper focus for a subject at a distance of about 1 meter from infinity. As its functional elements, a manual focus control 1, an aperture mechanism 2, and a strobe device 3 are provided. Have.
The user of this camera presses the close-up shooting mode selection button 4 when determining that the subject is 1 to 40 cm. Then, the manual focus control 1 has a short distance set at the time of design, 70 (depending on conditions such as the focal length of the lens and a strobe, for example, when using a lens with a focal length of 35 mm).
The lens is forcibly set to a position at which an appropriate focus can be obtained for a centimeter subject, the aperture value set in the aperture mechanism 2 is set to F = 16, and the flash device 3 is turned on.

As a result, for example, if the focal length of the lens is 3
If the diameter of the circle of confusion is 5 mm and the diameter of the permissible circle of confusion is 0.08 mm, the permissible depth of field is 40 to 195 cm. However, although the light amount may be insufficient because the aperture is set to F = 16, the strobe light is forcibly emitted, so that a substantially necessary light amount of the subject can be obtained. For example, if a strobe with a guide number of about 10 is used and a film of ISO 100 is used, the range where sufficient brightness can be obtained is 40 to 120 cm.
It is possible to shoot all the subjects within a range of up to 120 cm with satisfactory clarity.

As described above, it is unnecessary to accurately measure the distance to the subject, which has been required conventionally, and the subject is captured and photographed with an extremely rough feeling of 40 to 120 cm or less to obtain a sufficiently clear photograph. This makes it very easy for a general amateur to shoot a subject at a close distance.

FIG. 2 shows a second embodiment of the present invention. The difference from the embodiment shown in FIG.
And the CPU 6 are provided.
The PU 6 performs auto focus control via the focus control 1 based on the output of the distance measuring sensor 5, and performs exposure control via the aperture mechanism 2 based on the output of the optical sensor 7.

However, when the distance measuring sensor 5 detects that the subject is within a certain distance, for example, within 1 meter, the focus control 1 sets a predetermined short distance, for example, 70 cm, to the subject. The aperture is forcibly set to a position where an appropriate focus can be obtained, the aperture setting value in the aperture mechanism 2 is set to F = 16, and the strobe device 3 is turned on. In this case, the same effect as in the above embodiment can be obtained.

[0016]

As described above, infinity beyond the short distance is obtained.
Use a fixed focus lens to shoot subjects at a distance
Even a very common spread type of camera that had a simple
In the structure, also, be a poor general user knowledge cameras, because all of the near distance of the object is clearly photographed, flower, plant, subjects that a depth of the ornament such as sharp as a whole Can shoot and can shoot
The target range can be greatly expanded than before .

[0017] Therefore, even with a very general popular camera, a satisfactory photographing result can be always obtained even when the photographing subject is at a short distance of about 40 to 120 cm, and the convenience of the camera can be obtained. Can be greatly improved.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a functional structure of a first embodiment of a camera according to the present invention.

FIG. 2 is a block diagram showing a functional structure of a second embodiment of the camera according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Focus control 2 Aperture mechanism 3 Strobe device 4 Close-up photography button 5 Distance measuring sensor 6 CPU

Claims (1)

(57) [Claims] It has a 1. A fixed focus lens, a diaphragm mechanism, a strobe, and selection means for selecting a close-up mode for taking a predetermined nearby subject, the close-up mode is selected together when it is forcibly set to the lens position to focus to the nearby subject, the diaphragm mechanism and the small aperture than normal, and a state of emitting the flash, the The range of the depth of field allowed by the small aperture is
Wider than the subject can be photographed by the flash
A camera characterized by being set .