JPH03219224A - Film integrated type camera - Google Patents

Abstract

PURPOSE:To obtain this inexpensive camera with a zoom function by enabling zooming operation by utilizing the advantage of a pinhole optical system which eliminates the need for focusing. CONSTITUTION:A high-speed film is taken-up and loaded in a camera main body 1. A pinhole 3 is pierced in the front plate 4' of an optical system dark box 4, provided in a collapsible state from the entire surface wall of the camera main body 1, with a specific hole diameter. Then the dark box 4 is displaced manually by sliding forward/backward linearly along the optical axis, thus the pinhole 3 is put closer to and away from the film surface for zooming with optional magnification. Consequently, the low-cost film integrated type camera with the zooming function 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 has the minimum necessary photographic functions such as a film advance mechanism, a shunter mechanism, a viewfinder, and a photographic optical system. In addition to having to provide only limited configurations, there is also a mission to simplify these essential configurations and provide the camera itself at a low cost.

[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.

Additionally, as this type of camera becomes more popular, users are requesting that it be equipped with a zoom function. is the current situation.

In view of the above-mentioned circumstances, an object of the present invention is to provide an inexpensive film-integrated camera having a zoom function in order to meet the needs of users.

[Means to solve the problem]

In order to achieve the above object, the present invention uses a pinhole as the photographing optical system, and displaces the installation surface of the pinhole with respect to the film surface along the photographing optical axis, thereby eliminating the need for focus adjustment.
(Depth of field from just in front of the camera to infinity)
It is designed to take advantage of the pinhole optical system that allows zooming.

〔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 RSO 1000 or higher is loaded so as to be able to be wound in one direction. Reference numeral 3 denotes a pinhole that is a photographing optical system, and the pinhole 3 is bored with a diameter of 0.2 to 0.41 in the front plate 4' of the optical system dark box 4, which is provided in a retractable manner from the front wall of the camera body 1. ing. This dark box 4 is slidably displaced in a straight line forward and backward along the optical axis by finger operation, and the pinhole 3 and film surface 2 are
Minimum distance as shown in figure and 3rd figure! ! , I and the maximum distance!
It becomes 2. Therefore, the minimum distance 2. When , pinhole 3
The light incident at an incident angle θ from is focused on the photosensitive areas P+, P+' of the film 2, while the maximum distance ! 2, the light (indicated by the broken line) incident from the pinhole 3 at an incident angle θ1 forms an image between P2 and P2' on the film surface outside the photosensitive area, so the photosensitive areas P, , P,' of the film 2 are The image formed inside is the central light that entered from the pinhole 3 at an incident angle θ2, and is zoomed by that amount. Therefore,
By making the dark box 4 appear and disappear by manual operation and moving the pinhole 3 closer to or farther away from the film surface, zooming can be performed to an arbitrary magnification. 5 is a scale marked on the side of the dark box 4 to indicate the magnification.

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, set the film sensitivity loaded in the camera body 1 to 150.
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 the 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 shutter mechanism with two blades 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 shutter 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.
(shutter charge state).

In this state, when the release button 8 is pressed, the stopper 16 moves downward via a connecting rod (not shown) that runs vertically within the rib portion a provided on the top surface of the dark box 4 along the direction of appearance and retraction. The release member 15 is moved to the left by the spring biasing force. As a result, the right side surface 12a of the upper end of the shutter blade 12 is kicked to the left, so 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 to the left, and the shutter blade 12
is returned to its original position by the urging force of the spring 14. The reciprocating time of the shutter blade 12 is set to 1/30 seconds or more, taking into account the limit of camera shake.
It is preferable to set the mass of the spring 2 and the biasing force of the spring 14.

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.

〔Effect of the invention〕

As described above, the present invention is characterized in that the photographing optical system is a pinhole, and the installation surface of the pinhole is displaceable along the photographing optical axis with respect to the film surface.
This has the excellent effect of making it possible to realize a low-cost film integrated camera equipped with a zoom function.

[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 at standard time, and Fig. 3 is the principle at maximum zoom. The partially cutaway side view shown in FIG. 4 is a schematic configuration diagram of the shutter mechanism section. 1-Camera body 2-Film 3-・-Pinhole 4-・Optical dark box 10-Shutter mechanism

Claims (1)

[Claims] A film-integrated camera characterized in that the photographing optical system is a pinhole, and the mounting surface of the pinhole is displaceable with respect to the film surface along the photographing optical axis.