JPH03219217A - Film integrated type camera - Google Patents

Abstract

PURPOSE:To photograph a person who is several meters before and the sky at the infinite distance in sharp focus state by slanting a photographic lens and thus setting its focus so that the lower part of a subject field is set to a short distance and the upper part is set to a long distance. CONSTITUTION:The photographic lens 4 is set as a panning-focus system which has an optimum focus position in a range of 1 - 5m and an object can be photographed in a proper focus state without focus adjustment. Then the optical axis O' of the photographic lens is slanted upward at a slight angle theta to the optical axis O perpendicular to a film surface F so that the lower part which is not an object field is focused to a short distance and the upper part is focused to a long distance. Consequently, the person at the lower part in an image plane and the background at the upper part of the image plane are photographed as a sharp image.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a disposable type film-integrated camera.

[Conventional technology]

Generally, this type of film-integrated camera is constructed by incorporating various photographing functions such as a lens, a shutter release button, and a winding mechanism into a housing in which film is loaded in advance. Since the camera has the characteristics of being small and lightweight and is extremely inexpensive, it has rapidly become popular as a simple disposable camera.

With the spread and expansion of these film-integrated cameras, the need for higher functionality has begun to emerge in recent years. That is, it has become desirable to have a film-integrated camera that has advanced functions such as strobe photography, zooming photography, and wide-angle photography. However, these advanced features are simple and
This is incompatible with the characteristics of film-integrated cameras, which are low cost and versatile, and various development issues have emerged.

[Problem to be solved by the invention]

In order to achieve both the above-mentioned sophistication of photographic functions and the simplicity and low cost that are the characteristics of film-based cameras, it is conceivable to configure the camera as a specialized type of simple camera whose use is limited to specific fields. .

For example, the most frequently used applications for film-integrated cameras are landscape photography and commemorative photos of multiple people, but conventional film-integrated cameras with strobes have a panning function that simplifies the focus adjustment of the photographic lens. Most of the items were focused. In this case, the photograph taken is, in principle, adjusted in focus so that all distances far from the optimal focus position, which is set several meters in front of the camera, are below a predetermined circle of confusion.

However, even if the photographic lens system is set to pan focus, it is actually difficult to achieve clear focus over the entire screen with a film-integrated camera that uses a simple lens. That is, it is impossible to eliminate the tendency for the focus to become weaker as the distance from the optimum focus position increases. For this reason, even with a dedicated film-integrated camera configured for the purpose of taking commemorative photographs of people, there was a problem in that the sky and mountains in the background could not be photographed sharply, reducing the value of the photograph by half.

In view of the above points, it is an object of the present invention to provide a film-integrated camera capable of photographing a person several meters in front of the user and the sky at an infinite distance in sharp focus.

[Means to solve the problem]

In order to achieve the above object, the film-integrated camera of the present invention tilts the photographing lens so that the lower part of the object can be focused at a close distance, and the upper part can be set at a far distance. The background on the upper side of the screen is also configured so that a sharp image can be obtained.

〔Example〕

Hereinafter, the present invention will be described based on an embodiment shown in the accompanying drawings.

Figure 1 is an overall perspective view of the film-integrated camera of the present application, Figure 2
The figure is a principle diagram showing the tilted state of the photographic lens, and FIG. 3 is a sectional view of the camera body.

In the figure, reference numeral 1 denotes the camera body of the film-integrated camera of the present invention, and the body 1 is constructed of a plastic housing, and is provided with a spool chamber S, a cartridge chamber P, and a film F inside. By covering the main body 1 with a paper carton printed with a predetermined design, a suitable appearance as a disposable camera can be obtained.

Reference numeral 2 denotes a shutter release button, and the button 2 is provided at a suitable position on the upper surface of the main body 1 so as to be able to trigger a charged-up shutter (not shown).

3 is a winding knob, and the winding knob 3 is provided on the back surface 1b of the main body 1 so that a part thereof protrudes. The knob 3 may be made of plastic molded in a different color from the main body 1 to make it easier to see and operate.

Reference numeral 4 denotes a photographing lens, and the photographing lens 4 is set to a pan-focus system in which the optimum focus position is within a range of 1 to 5 m, so that it is possible to photograph a subject in proper focus without adjusting the focus. ing. However, the optical axis O' of the photographic lens 4 is tilted upward by a slight inclination angle θ with respect to the optical axis 0 perpendicular to the film plane F (normal photographic optical axis), so that the lower part of the subject can be seen in close proximity. It is possible to set the focus to the distance or upwards to a long distance. This is to obtain a sharp image of not only the person at the bottom of the screen, but also the blue sky and mountains, etc. at the top of the screen, when taking commemorative photos of people, which is the main purpose of the camera of this application.

5 is a counter indicating the number of remaining films.

Reference numeral 6 denotes a finder, and the finder 6 consists of a transparent through hole provided at a suitable position on the upper surface of the main body 1.

Reference numeral 8 denotes a strobe light emitting section, and the strobe light emitting section 8, including its peripheral circuit 8a, is arranged in a flat space formed by a depth difference (R-r) between the spool chamber S and the cartridge chamber P of the main body 1. . Further, the strobe light emitting unit 8 is configured to emit strobe light in a direction parallel to the optical axis O, and can mainly illuminate a subject (such as a person) on the lower side of the screen.

In the above embodiment, the photographer grasps the main body 1 of the film camera of the present invention, frames the subject using the finder 6, and presses the shirt release button 2. At this time, since the photographing lens 4 is set to pan focus, no focusing operation is necessary. Further, the optimal focus position of the photographic lens 4 changes from near to far as it goes from the bottom of the screen to the top due to the "tilt effect" caused by the lens tilt. For this reason, it is possible to clearly photograph and record both people at the bottom of the screen and backgrounds such as the sky and mountains at the top of the screen.

〔Effect of the invention〕

As mentioned above, the film-integrated camera of the present invention is characterized in that the photographic lens is tilted so that the focus can be set at a short distance below the field of view and at a long distance above the field.
Both the person at the bottom of the screen and the background at the top of the screen can be rendered sharp and in focus.

As a result, it is possible to achieve optimal focus in the most frequently used shooting formats, such as commemorative shots with scenery at a travel destination in the background, contributing to the improved convenience of film-integrated cameras. It has the following effects.

[Brief explanation of drawings]

Figure 1 is an overall perspective view of the film-integrated camera of the present application, Figure 2
The figure is a principle diagram showing the tilted state of the photographic lens, and FIG. 3 is a sectional view of the camera body. Shutter release button Winding knob ↑ Closest lens counter Finder Strobe light emitting unit Strobe peripheral circuit Battery chamber (of the photographing lens) Incline angle Spool chamber Patrone chamber Film Strobe changeover switch

Claims (1)

[Claims] A film-integrated camera that features a tilted photographic lens that allows you to focus on the lower part of the subject at close range and the upper part at far distance.