JPH0394241A - Camera of film integral type - Google Patents

Abstract

PURPOSE:To take a well-color-balanced, high quality picture of a wide brightness range wherein photographing is possible by employing a tungsten type high- sensitivity film and attachably and detachably providing a daylight correction filter. CONSTITUTION:For an incorporated film, the tungsten type film is used. In the film integral type camera 1, the daylight correction filter is inserted into the optical path of a photographing lens 2A in the daytime, and the light quantity of a shorter wavelength is suppressed more to reduce exposure. Therefore, overexposure is prevented in outdoor photographing in the daytime. In the evening or in a room illuminated with artificial light, the correction filter is retreated from the lens optical path, and accordingly the film is used as an inherent high-sensitivity tungsten type to prevent underexposure even in such evening and room. Even a photographer takes a picture of an object in the daytime to evening under natural light, outdoor, in a room illuminated with artificial light, he can obtain a high-quality photograph all the time.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a film-integrated camera that has a built-in film and whose light-tight case is disassembled to take out the photographed 7 films after photographing is completed.

[Background and purpose of the invention]

A film-integrated camera is also called a disposable camera, and the camera is loaded with film from the beginning, and when the shooting is finished, it is returned to the processing laboratory, where the film is removed from the camera and developed.

The mission of a camera ends when it finishes shooting one roll of film, so cameras need to be low-cost, so a single lens with a fixed aperture is usually used as a shooting lens, and the shank is also a constant speed lens. Equipped with a simple format. Therefore, since the subject to be photographed is limited to a certain range of brightness, it is mainly used as an outdoor disposable camera for photographing outdoors during the day.

However, as such disposable cameras have become popular, they have also come to be used for taking pictures indoors or in vehicles during travel. To that end, we have developed a daylight-type high-sensitivity 7-ilm (
Cameras with a built-in sensitivity of about 150,400 are now available.

However, such cameras have the problem of overexposure when shooting outdoors in bright light, resulting in a decrease in image quality, and in the evening or indoors, which are primarily illuminated with tungsten light, the amount of light is insufficient and the color balance deteriorates, resulting in a decrease in image quality. There was a point.

Figure 3 shows a comparison of the spectral distributions of natural daylight and tungsten light.

One way to solve the above problem is to use ND when shooting outdoors.
7 {One possible method is to attach a color balance correction filter to raise the color temperature when shooting in the evening or indoors, but this method is complicated and easy for beginners to make mistakes; Since the balance correction filter is installed, the exposure amount is further reduced, and the range and conditions under which the subject can be photographed are not expanded.

In addition, a 7-ilm integrated sword camera with a built-in daylight-type high-sensitivity film and a strobe light emitter has become available, but it has the problem of being expensive at nearly 2@2.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and provide a film-integrated camera that is inexpensive, has a wide photographable luminance range, and is capable of obtaining high-quality photographs with good color balance. .

[Structure of the invention]

The above purpose is to use a film-integrated camera that has a built-in film and whose light-tight case is disassembled after shooting to take out the shot film. The film-integrated camera features a removable correction filter.

〔Example〕

FIG. 1 is a perspective view of a film-integrated camera showing an embodiment of the present invention. In the figure, 1 is the camera body, which is a light-tight case made of a box-shaped member made of black resin. ing. A photographing lens section 2 having a photographing lens 2A having a focal length of around 35 mm, for example, with Fil, slightly protrudes from the front of the camera body l.
There is a camera behind the two photographic lenses, for example, a speed sensor of about 1/2
A 100 sec shutter is installed. Further-,
It is equipped with a frame-shaped viewfinder 4 that indicates the shooting range, a filter switching button 3, and a shirt release button 5, 7, and an illumination counter window 6 on the top of the camera body l, and a knob 7 for film winding on the back. It is provided.

For example, when the filter switching button 3 is positioned in the -hi direction, a correction filter for daylight that lowers the color temperature is inserted into the optical path of the photographic lens 2A, and the button is in a state for daytime use. When the 7-ilter switching button 3 is located in the lower position, the correction filter is retracted from the lens optical path, and the camera is in a state for evening and indoor use. The above-mentioned filter can be a gelatin filter in which a gelatin layer made of a dye and gelatin is coated on a transparent thin plate of plastic, or a filter in which a dye is dispersed in plastic and made into a thin plate, so it is extremely inexpensive.

The camera winds up seven films each time one frame is taken and winds the exposed film into the cartridge, and when a predetermined number of shots have been taken, the entire film is wound into the cartridge.

The exposed film is sent from the user to the processor while still in the camera body, and the processor disassembles the camera case in a bright room, takes out the cartridge, and then processes the film as usual. P. The system is capable of performing processing operations similar to those of the Ef}- industry.

The film built into the 7-ilm integrated camera of the present invention is a tungsten type film with a sensitivity of ISO400.
or 400 equivalent or more. Figure 2 is a graph showing an example of the spectral sensitivity curve of a normal daylight film, but the spectral sensitivity of the film used in the present invention is Compared to the film, the sensitivity of the blue photosensitive layer B is set high and the sensitivity of the red photosensitive layer R is set low.

In the 7-ilm integrated camera of this embodiment, the filter switching button 3 is positioned upward during the day, and the photographing lens 2
A daylight correction filter is inserted into the person's optical path. Therefore, the amount of light is suppressed the shorter the wavelength, and the above-mentioned tungsten type film is corrected for daylight use, and the amount of light passing through it is slightly reduced, so the amount of exposure is reduced, resulting in overexposure when shooting outdoors during the day. This can prevent the image quality from deteriorating.

In addition, in the evening or indoors with artificial light, the position of the filter switching button 3 is moved downward, and the correction filter is retracted from the inside of the lens, so that the film can be used as a high-sensitivity tungsten type film. evening·
Even indoors, it is possible to obtain high-quality photographs with good color balance without underexposure.

〔Effect of the invention〕

As explained above, the present invention uses a high-sensitivity tungsten type film and has a removably inserted correction filter for daylight, so the price of the camera can be increased with a simple structure. This is a film that can always take pictures with the correct exposure and obtain excellent image quality for subjects with a wide range of brightness, from daytime outdoor photography with natural light to evening photography or indoor photography with artificial light. We are now able to provide a body camera.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing an embodiment of the present invention, Fig. 2 is a graph showing an example of the spectral sensitivity curve of a normal daylight film, and Fig. 3 is a spectral distribution diagram of daylight and tungsten light. It is. l...Camera body 2A...Photographing lens 4...Finder 2...Photographing lens section 3...Filter switching button

Claims (1)

[Claims] In a film-integrated camera that has a built-in film and whose light-tight case is disassembled to take out the film after shooting, the film is a tungsten type high-sensitivity film and a correction filter for daylight is removably inserted. A film-integrated camera with the following features: