JPH03219225A - Film integrated type camera - Google Patents

Abstract

PURPOSE:To obtain this film integrated type camera using a pinhole optical system which eliminates the need for aberration compensation and fitting operation by forming a pinhole having a specific hole diameter as a photography optical system and loading a film with the specific sensitivity. CONSTITUTION:The pinhole 3 with a 0.2 - 0.4 mm hole diameter is used as the working optical system and the film 2 which has a ISO >=1000 speed is loaded. Namely, a collective image consists of small holes projected on the surface of the film 2 through the pinhole 3 and a sharp image can not be obtained when the hole diameter of the pinhole 3 is too small or too large. The photographic sensitivity of the loaded film compensated a failure in obtaining a bright image when the diameter of luminous flux passing through the pinhole 3 is much less than that when a lens is used. Consequently, the low-cost film integrated type camera which uses not lens is realized.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention involves loading an unexposed film into the camera body in advance, and after shooting all the frames, the camera itself is broken and the exposed film inside is removed. This relates to a film-integrated camera that takes out the film.

[Conventional technology]

This type of camera is commonly referred to as a "disposable camera" in some quarters, and it has all the photographic functions necessary for practical use, such as the film advance mechanism, shutter mechanism, finder, and photographic optical system. In addition to having to provide only the minimum configuration, there is a mission to simplify these essential configurations and provide the camera itself at a low price.

[Problem to be solved by the invention]

Currently, the film advance mechanism and shutter mechanism have been simplified, but lenses are still used in the photographic optical system, so there are problems with correction of various aberrations, and lens installation is troublesome, making manufacturing and assembly difficult. There was a problem of increasing costs.

In view of the above circumstances, it is an object of the present invention to provide a film-integrated camera using a pinhole optical system that does not require correction of aberrations or installation work.

[Means to solve the problem]

In order to achieve the above object, the present invention provides a film-integrated camera in which the photographing optical system has a hole diameter of 0.2 to 0.4 mw.
1 pinhole, loaded with a film of ISO 1000 or higher, and by utilizing the advantages of the film's high sensitivity value and ultrafine particle structure, it was configured to compensate for the drawbacks of the pinhole optical system, which originally has a small amount of incident light. It is something.

〔Example〕

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

In the figure, 1 is a camera body, and inside the camera body 1, a film 2 having an ultrafine particle structure and having a sensitivity of ISO 1000 or higher is loaded so that it can be wound in one direction. Reference numeral 3 denotes a pinhole which is a photographing optical system, and the pinhole 3 has a hole diameter of 0.2 to 0.4 mm and is formed in a plate-shaped body 4 that is fitted into a protrusion 5 raised from the front wall of the camera body 1. Become.

The distance 2 between the pinhole 3 and the film 2 is set to, for example, about 50 mm, which corresponds to the focal length of a standard lens of an ordinary camera, as shown in the second figure. The raised portion 5 becomes a portion into which a pinhole cap (not shown) is fitted when not in use.

The reason why the diameter of the pinhole 3 is set to 0.2 to 0.4 mm is that the image projected onto the film surface by the pinhole is an aggregate image of small holes, so even if it is smaller than this, it will not be too large. This is because even if it is too high, a sharp image cannot be obtained. For specific dimensions within this range, consideration must be given to the purpose of use of the camera, photographing conditions, film sensitivity, thickness of the plate forming the pinhole, degree of surface finish of the inner peripheral surface of the pinhole, etc.

Also, the sensitivity of the film loaded in the camera body 1 is set to ISO.
The reason why it is set to 1000 or more is to compensate for the fact that the diameter of the light beam passing through a pinhole is much smaller than when using a lens, and a bright image cannot be obtained. ISO1000
If the film has an ultrafine grain structure and has the sensitivity value above, it is possible to take sufficient photographs without using a strobe. Of course, it is more preferable to use a film of ISO 1600 or ISO 3200.

6 is a see-through finder, and 7 is a film winding knob. The winding knob 7 is constructed so that one frame of film can be wound up with one rotation in one direction. 8 is a release button, and 9 is a counter window.

Reference numeral 10 denotes a simple single-blade shutter mechanism installed on the rear surface of the pinhole 3;
As shown in the figure, one shutter blade 12 is rotatably supported by a shaft 11, a stopper 13 determines the shielding position of the shunter blade 12, a spring 14 biases the shutter blade 12 clockwise, and a reciprocating It consists of a release member 15 displaceably mounted and a stopper 16 thereof, and operates as follows. That is, the release member 1
5 is spring-biased so that it always runs in the direction of arrow a, but when the film runs due to winding by the winding knob 7, a sprocket (not shown) rotates using the perforation, and a sprocket (not shown) rotates coaxially with this. is pushed in the direction of the arrow by the cam against the biasing force of the spring, climbs over the left slope 12b of the shutter blade 12 as shown by the two-dot chain line, and then stops 16 at the right side surface 12a of the upper end of the shutter blade 12.
(shank-charged state).

In this state, when the release button 8 is pressed, the stopper 16 moves downward and the release member 15 is moved to the left by the spring biasing force. As a result, the shutter blade 12
Since the right side surface 12a of the upper end is kicked leftward, the shutter blade 12 rotates counterclockwise against the biasing force of the spring 14 to open the pinhole 3 (the position indicated by the two-dot chain line).

When the shutter blade 12 rotates, the release member 15 passes over the upper end portion to the left, and the shutter blade 12 is returned to its original position by the biasing force of the spring 14. It is preferable to set the mass of the shutter blade 12, the biasing force of the spring 14, etc. so that the reciprocating time of the shutter blade 12 is 1/30 seconds or more, taking into account the limit of camera shake.

Reference numeral 20 denotes a strobe light emitting unit, and a light emitting switch (not shown) of the strobe light emitting unit 20 is configured so that when the shutter blade 12 is fully opened, it can be turned on by being pressed by the shutter blade 12 at the fully open position. There is.

Note that although the camera of this application is not designed to use strobe light, if it is assumed that strobe light will be used all the time, IS
Of course, it is possible to load a film having a film sensitivity value of O1000 or less.

Although one embodiment has been described above, the present invention is not limited thereto, and can be modified in various ways without changing the gist thereof.

[Effects of the Invention] As described above, the present invention provides a photographing optical system with a hole diameter of 0.2 to 0.2.
Since it has a pinhole of 0.4 tam and is loaded with a film of 1,501,000 or more, it has the excellent effect of realizing a low-cost film-integrated camera that does not use a lens.

[Brief explanation of drawings]

The figures show an embodiment of the film-integrated camera according to the present invention, in which Fig. 1 is an external perspective view, Fig. 2 is a partially cutaway side view showing the principle, and Fig. 3 is a schematic configuration diagram of the shank mechanism. It is. 1-Camera body 2-Film pinhole 4-Plate body 10-Shutter mechanism

Claims (1)

[Claims] A film-integrated camera characterized in that a photographing optical system is a pinhole with a diameter of 0.2 to 0.4 mm, and a film of ISO 1000 or higher is loaded.