JP3208676B2 - Film integrated camera - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION This invention is, pre-film shooting Allowed
The present invention relates to a film-integrated camera which is loaded in the camera in an operable state, and which enables photographing immediately after purchase .

[0002]

Film all-in-one camera Background of the Invention, also referred to as the use Ki Rika camera, the camera have been loaded film from the beginning, it is returned to the developing plant one roll of the shooting is finished, here from camera film And is developed. Cameras are required to be extremely inexpensive, easily photographed, and photographed without fail.

As a taking lens, a single lens having a focal length of about 35 mm is often used. As is well known, a single lens is inexpensive, but the correction of astigmatism, distortion, coma, etc. including spherical aberration is insufficient, so a fixed small stop lens is used . However, chromatic aberration cannot be corrected and the magnification aberration increases as the angle of view increases, and the performance is degraded around the screen. Therefore, in order to remedy focus deterioration around the screen, the focus image plane should be R = 250mm or more and 270mm
It is often made to bend to a cylindrical surface of a degree. When such a photographing lens is used, the thickness of the camera needs to be 30 mm or more.

[0004]

The external appearance of both a film-integrated camera and a normal camera is almost the same size. When a photograph is taken at a travel destination or the like, an ordinary camera may carry a camera and a plurality of films, but in the case of a film-integrated camera, it is necessary to carry a plurality of single-use cameras.

[0005] For this reason, it is required that the film-integrated camera has a smaller camera body volume than the ordinary camera. SUMMARY OF THE INVENTION An object of the present invention is to provide a film-integrated camera in which the thickness of the camera body is thin, excellent in portability, and can be used easily.

[0006]

SUMMARY OF THE INVENTION The object of the present invention is to prepare a film in a camera in advance.
Film-integrated type that allows for immediate shooting when loaded
In camera, focal length is 28-32mm
Using a photographic lens consisting of a meniscus lens
Change the shape of the film transport path in the face frame
Is concave toward the taking lens with a radius of curvature of 130 mm or less.
As a curved surface composed of a cylindrical side facing
Camera thickness on the optical axis of the shooting lens
m or less, which is achieved by a film-integrated camera.

[0007]

FIG. 1 is a sectional view of a camera showing the structure of an embodiment of the present invention. In the figure, reference numeral 1 denotes a camera body, 2 denotes a taking lens, a single lens of plastic having a focal length f of 28 to 32 mm, and an F number of 9 or more. 3 denotes a fixed stop provided immediately after the taking lens 2; Reference numeral denotes a shutter which is provided further behind the photographing lens 2 and operates at a shutter speed of about 1/100 sec, for example, and constitutes a second aperture.

A film supply chamber 11 is provided on the left and right sides of the camera body 1.
And a film take-up chamber 12 and a film F having a sensitivity of ISO 400 which is wound in the film supply chamber 11.
The film conveying direction is addressed one at a film transport path 13 having a screen frame comprising a screen longitudinal exposure, it is winding in patrone P of the film take-up chamber 12. The transport path in the filming screen portion of the film is formed in a cylindrical shape having a cylindrical side surface with a radius R of 130 mm or less in which the longitudinal direction of the screen is curved so as to correct the curvature of the image plane due to the photographing lens 2.

As described above, the focal length of the taking lens is
Larger than 32 mm, the radius of the curved surface in the screen longitudinal direction is R = 13
If it is larger than 0 mm, the thickness as a camera will be 30 mm
The focal length is 28 to 32 mm as a shooting lens
Curved surface in the longitudinal direction of the screen using a meniscus lens
By setting the radius of R to 130 mm or less,
Lens from the front of the taking lens on the optical axis.
The thickness D2 of up La Rear be the following thin 30 mm, the longitudinal direction of the thickness D1 of the camera as a 22mm or 26mm or less
Also, the lens portion does not protrude greatly, and a shape excellent in portability can be obtained.

Next , one embodiment of a specific photographing lens is shown in Table 1.
Shown in

[0011]

[Table 1]

This lens is a meniscus lens.
Place the film surface to a position of the lens optical axis on the lens rear 26 mm,
The film surface is a cylindrical side surface curved at R = 110 mm in the longitudinal direction of the screen. Therefore, on the optical axis of the lens
The length from the first surface of the lens to the film surface is 27.9mm
The focal length of the lens can be shorter than 30 mm. FIG. 2 is a cross-sectional view of the lens, and FIG. 3 is an aberration diagram when the film surface is flat. Astigmatism is sagittal and meridional both on the minus side and the image surface is curved. This shows that the aberration characteristics are improved by performing the above. When an MTF curve is obtained for the case where the image plane is flat and the case where the image plane is curved, the MTF (resolution) at the periphery of the screen is considerably reduced in the case of flat, but becomes concave with a radius of curvature R = 110 mm. It has been recognized that the MTF (resolution) is the least reduced even at the peripheral portion of the screen when a cylindrical surface is used.

[0013]

Oite to the present invention, the thickness of the photographic lens unit
Can be made as thin as 30 mm or less.
This makes it possible to provide a thin, highly portable film-integrated camera that does not protrude .

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a camera showing one embodiment of the present invention.

FIG. 2 is a cross-sectional view of a taking lens according to one embodiment.

FIG. 3 is an aberration diagram of the photographing lens shown in FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Camera main body 2 Shooting lens 3 Fixed aperture (aperture A) 4 Shutter (aperture B) 11 Film supply chamber 12 Film winding chamber Film transport path

Claims (1)

(57) [Claims] 1. A film is loaded in a camera in advance.
Film-integrated camera that enables immediate shooting
Te, the meniscus of the focal length of a single configuration 28~32mm
Using a photographic lens consisting of a lens,
The shape of the film transport path in the longitudinal direction of the screen
A circle with a concave surface facing the taking lens with a radius of 130 mm or less
The shooting lens of the shooting lens
A film-integrated camera, wherein the thickness of the camera on the lens optical axis is 30 mm or less .