JPH0786670B2 - Film unit with lens - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a film packaging container (hereinafter, referred to as a lens-fitted film unit) having a photographing function such as a photographing lens and a shutter.

[Conventional technology]

Conventionally, when a photograph is taken, it is customary to load the camera with a film. However, only a few people carry a camera with them at all times, and most people had the inconvenience of not having a camera when they wanted to take a picture. In order to make it possible to easily take a picture even in such a case, a film unit with a lens (trade name "Sharan") is commercially available from the applicant.

This lens-fitted film unit is equipped with a 110-size film cartridge (film sensitivity: ISO100) pre-loaded in a light-tight container that incorporates shooting functions such as a shooting lens and shutter, and a focal length f = 26mm, shutter speed 1
The photograph can be taken under the conditions of / 100 and aperture F = 11. This product appealed to users because it met the above needs and was extremely easy to handle.

The 110 size film built into this "Sharp Run" gives a satisfactory image quality within the specified brightness range,
There is a limit to the image quality due to the small screen unique to the 110 size, and improvement of the image quality during enlarged printing has been desired.

From this point, there has been a demand for a product in which a film unit with a lens having a larger screen size, for example, a film with a width of 35 mm is built in. In particular, international standards (ISO 1007-107
If a 35 mm film with a cartridge defined by 9) can be used, the existing machine can be used in the manufacturing process of the film unit with lens, photographing, developing, printing, etc., so that it does not cause a special increase in costs and Both users have great advantages.

[Problems to be solved by the invention]

With the lens-fitted film unit with a built-in 35 mm width film, the size of the film becomes larger as described above, so the entire lens-fitted film unit (the entire packaging container) becomes larger accordingly, and the user can carry it around easily. In order to be able to do so, the lens-fitted film unit must be miniaturized to an appropriate size.

Further, when a 35 mm film with a cartridge is incorporated in the film unit with a lens instead of the 110 film cartridge, the following problems occur. That is, since the cartridge stores the unexposed film in a light-shielded state, the work of incorporating the film into the unit body of the lens-fitted film unit can be easily performed.
Then, after use, the photographed film is in a state of being pulled out from the patrone, and it is necessary to take out the film in a dark room. Such darkroom work is
When considering a large amount of development processing, it becomes very troublesome.

If you rewind the filmed film that has been pulled out from the film cartridge into the film cartridge, you can take out the film in a bright room, but you must provide a film rewinding mechanism in the lens-fitted film unit. ,
The cost will increase. Then, at the developing station, it is necessary to perform the rewinding work for all the collected lens-fitted film units, and although the work can be performed in a bright room, there is a problem in work efficiency.

On the other hand, in the above-mentioned “Shooting Run” using the 110 film, a shooting lens of f = 26 mm is used.
An image of standard magnification can be obtained on the 0 film surface, whereas a taking lens of f = 45 to 55 mm is required to obtain an image of standard magnification on a 35 mm size film. Become. However, when a photographing lens having such a focal length is used, the thickness of the main body of the lens-fitted film unit, that is, the main body of the unit, must be greater than this focal length, which is extremely inconvenient to carry. Of course, if the retractable mechanism of a conventionally known lens shutter type camera is adopted and the photographing lens can be freely retracted from the main body of the film unit with lens, the thickness of the unit main body can be reduced, but the photographing lens can be accurately used. In order to make the mechanism for appearing and retracting reliable, the mechanism is expensive and is not suitable for the lens-fitted film unit.

Further, a known lens shutter type camera for a 35 mm film uses a taking lens with a focal length of 55 mm or less near a wide angle, but such an taking lens is expensive because of its large number of constituent elements and large diameter. In addition, it is disadvantageous in terms of space and cannot be used for a lens-fitted film unit.

[Object of the Invention]

The present invention is a conventional film unit with a lens and 35 mm
Repeated research on camera for film, with cartridge
Despite using a 35 mm film, it is possible to take out the film in a bright room without using a rewinding operation after use, and a film unit with a lens can be used while shooting with a screen size of 24 × 36 mm. Without increasing the thickness, keep the thickness below the focal length of the standard lens,
An object of the present invention is to provide a lens-fitted film unit equipped with a taking lens which is inexpensive and which is sufficiently satisfactory in performance.

[Means for solving problems]

In order to achieve the above object, the present invention provides a unit main body in which a lens and a shutter mechanism are incorporated with a cartridge.
When loading the 35 mm film, a cartridge and a film that is rolled out from this cartridge are arranged on both sides of the exposure frame formed on the unit body. It is configured to be rolled up in sequence.
A single-lens lens is used in the optical system for photographing on this film, and at the exposure position behind the single-lens lens, the film becomes a curved surface with a concave surface facing the lens in the feeding direction. and the focal length f (mm) of the single lens in the range of 33 ≦ f ≦ 40, the aperture of the fixed when the ^{F, F ≧ f 2/150} ...... (1) F ≧ 34.3-0.75 f …… (2) F ≦ 16 …… (3) is satisfied.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

〔Example〕

In FIG. 3 showing the external appearance of a lens-fitted film unit using the present invention, a unit main body 1 is a main body base 2 made by molding plastic, and a back plate that closes the rear side opening of the main body base 1 in a light-tight manner. 3 and 3. The main body base 2 is provided with a taking lens 4, a finder window 5, and a release button 6, and a photographing mechanism such as a shutter and a film winding mechanism is incorporated inside. The back plate 3 is
It is fixed to the main body base 2 by ultrasonic welding or the like so that the user cannot remove it.
More preferably, the unit main body 1 is always covered with a paper box (not shown), and holes for exposing the taking lens 4 and the release button 6 are opened in this paper box so that operation can be performed through these holes.

As will be described later in detail, the unit main body 1 has a screen size of 24 rolls drawn from the cartridge.
× 36mm 135 type film roll and patrone for winding this (this patrone and film are
International standard ISO: 1007-1979 was standardized)
And are loaded, the user who purchases them can directly operate the release button 6 to take a picture. Winding knob 8 each time you take a picture (see Fig. 1)
The exposed film is wound into the cartridge by operating. Then, after all the frames have been shot, they are submitted to the photofinishing shop as they are. At the developing station, the cartridge is taken out from the unit main body 1, the conventional developing and printing processes are performed, and the negative and the print photograph are returned to the user.

In FIG. 1 showing a state before attaching the back plate 3 to the main body base 2, an opening 2a extending from the back surface to the bottom surface is formed in the main body base 2.
Is formed, and the back plate 3 is formed so as to shield the opening 2a in a light-tight manner.
The shape of is fixed. The main body base 2 has an exposure frame.
Film roll chamber 11 and patrone chamber so as to sandwich 10
Twelve are provided. On the upper wall of the cartridge chamber 12, a fork 14 for film winding, which rotates in a counterclockwise direction in the figure in association with the operation of the winding knob 8, projects. Further, the film supporting surface 15 on which the exposure frame 10 is formed is raised toward the back plate 3 side as shown in the drawing, and a sprocket 16 is exposed above the film.

In the main body 1 of the film unit, a cartridge 20 and a film 21 pulled out from the cartridge 20 in advance at the time of assembly are provided in the film roll chamber 11 and the cartridge chamber 1
2 loaded respectively.

Thereafter, the back plate 3 is covered so as to shield the opening 2a from the light, and is fixed to the main body base 2 by ultrasonic welding. On the inner surface of the back plate 3, there is formed a film regulating surface 30 which is curved similarly to the film supporting surface 15 on the main body base 2 side. Therefore, by covering the back plate 3 on the main body base 2 by pressing the film 21 from above, and fixing the back plate 3 to the main body base 2, the spread portion 26 of the film which is curved to the upper side becomes a film supporting surface 15 as shown in FIG. Then, the film surface is positioned at a predetermined exposure position without rising or waviness of the film surface. At this time, the sprocket 16 comes into mesh with the perforation. Of course, an opening for receiving the protruding portion of the sprocket 16 is provided in a part of the film regulation surface 30.

In addition, one bottom of the back plate 3, that is, the film roll chamber
A step 32 is formed at the bottom of the film 11, and the bottom of the film roll chamber 11 is higher than that of the cartridge chamber 12. This is because the film roll chamber 11 needs to support the lower edge of the film roll 23 itself.
The film 32 keeps the posture of the film 21 horizontal. The above film loading and back plate 3 mounting work
Both are done in a dark room.

The lens-fitted film unit manufactured in this manner can be immediately used for photography. That is, when the release button 6 is operated, the shutter 35 is opened and closed, and the spread portion 26 of the film located in the exposure frame 10 is exposed. Thereafter, when the winding knob 8 is rotated, the cartridge shaft 28 is rotated via the fork 14, so that the exposed film is wound into the cartridge 20. At the same time, the next film frame is supplied from the film roll 23 to the position of the exposure frame 10, and the sprocket 16 is rotated by the supply of the film. When the one-frame fixed-length feed is detected by the rotation of the sprocket 16, the winding knob 8 is locked and the preparation for the next photographing is completed.

The photographing optical system including the photographing lens 4 is configured as shown in FIG. 4, and the photographing lens 4 itself is obtained by molding a transparent acrylic resin. The focal length of the photographing lens 4 is a value within the range of 33 to 40 mm, and the F-number of the entire optical system is set by the first diaphragm 41 and the second diaphragm 42 arranged behind the photographing lens 4. It This F value is set within a range that satisfies the following three expressions.

By ^{F ≧ f 2/150 ...... (} 1) F ≧ 34.3-0.75f ...... (2) F ≦ 16 ...... (3) to satisfy this condition, the use of single lens fixed focus, It is possible to obtain sufficient photographic performance.

The expression (1) represents the aperture value F for making the circle of confusion less than 0.05 (mm) for a subject distance from 1.5 m to infinity. And when the circle of confusion is δ, the hyperfocal length α is And the shortest distance l at this time is Is expressed as Becomes Here, if δ <0.05 and l = 1500 mm, the above formula (1) is obtained.

Further, the equation (2) is set based on the resolution of the peripheral image based on the MTF table of the embodiment described later. For example, referring to the camera export inspection standard, the resolution is required to be 27 lines / mm at the center of the screen and 11 lines / mm at the periphery, but in order to meet this, the MTF value for each is 20%.
It has been empirically confirmed that the design should be made to exceed. However, this is a case of a glass lens, and since it is premised that the manufacturing error can be suppressed within a narrow range and the surface reflection is small, a low-cost plastic lens such as that used for the lens-fitted film unit of the present invention. Then, by designing the MTF value to exceed 30%, a desired resolution can be obtained.

Further, the expression (3) is determined as a practical aperture value determined from the film sensitivity and the shutter speed. From these expressions (1), (2) and (3), the shaded area is shown in FIG. Such a practical effective range can be determined. The curve X in FIG. 5 is the correlation characteristic between f and F satisfying δ = 0.05, and the straight line Y is the correlation characteristic between f and F satisfying the resolution of 11 lines / mm at the periphery of both sides. is there.

The following shows optical data of Examples 1 to 8 in which the focal length of the single lens having the aspherical surface on the first surface (object side) is changed in 1 mm increments from 33 mm to 40 mm. The surface number i is given from the object side, R is the curvature, D
Is the central thickness, Nd is the refractive index, and νd is the Abbe number.

Further, FIGS. 6 to 13 show aberration characteristics of these examples. In each figure, (A) shows spherical aberration, (B) shows astigmatism, and (C) shows distortion. There is.

The “* 1” aspherical surface is expressed by the following equation.

However, in the above equation, the aspherical coefficients C, k, a ₁ , a ₂ , a ₃ , a ₄ are constants and take the following values.

C = 0.14413578 k = -0.477370 a ₁ = -5.47510 x 10 ^-4 a ₂ = 9.10545 x 10 ^-5 a ₃ = -5.14738 x 10 ^-6 a ₄ = 1.11811 x 10 ^-7 Also, the "* 1" aspherical surface The formula is the following "* 2" to "*"
Since 8 "is the same in aspheric, in these examples shown aspherical coefficients _{C, k, a 1, a} 2, a 3, a 4 only.

Aspherical constant C = 0.13962566 k = -0.461891 a ₁ = -4.31041 x 10 ^-4 a ₂ = 6.77186 x 10 ^-5 a ₃ = -3.49734 x 10 ^-6 a ₄ = 6.96944 x 10 ^-8 Aspheric constant C = 0.13534861 k = -0.478975 a ₁ = -3.26922 x 10 ^-4 a ₂ = 5.04583 x 10 ^-5 a ₃ = -2.37833 x 10 ^-6 a ₄ = 4.36154 x 10 ^-8 Aspherical constant C = 0.13158231 k = -0.523034 a ₁ = -2.54139 x 10 ^-4 a ₂ = 4.08760 x 10 ^-5 a ₃ = -1.82112 x 10 ^-6 a ₄ = 3.17942 x 10 ^-8 Aspherical constant C = 0.12737582 k = -0.517579 a ₁ = -1.95633 x 10 ^-4 a ₂ = 3.07536 x 10 ^-5 a ₃ = -1.25317 x 10 ^-6 a ₄ = 2.01612 x 10 ^-8 Aspherical constant C = 0.12350647 k = -0.542557 a ₁ = -1.53998 x 10 ^-4 a ₂ = 2.50140 x 10 ^-5 a ₃ = -9.62722 x 10 ^-7 a ₄ = 1.46987 x 10 ^-8 Aspherical constant C = 0.11959821 k = -0.538383 a ₁ = -1.19707 x 10 ^-4 a ₂ = 1.93618 x 10 ^-5 a ₃ = -6.88647 x 10 ^-7 a ₄ = 9.78497 x 10 ^-9 Aspherical constant C = 0.11578548 k = -0.555125 a ₁ = -9.48602 x 10 ^-5 a ₂ = 1.58222 x 10 ^-5 a ₃ = -5.31102 x 10 ^-7 a ₄ = 7.14642 x 10 ^{-9 In} the above embodiment, Height from optical axis is Y = 0.3 / C
When the amount of displacement from the reference spherical surface (curvature radius can be represented by 1 / C) is z, the first embodiment z = −0.00812 the second embodiment z = −0.00757 the third embodiment z = −0.00701 the fourth Example z = -0.00664 Fifth Example z = -0.00626 Sixth Example z = -0.00604 Seventh Example z = -0.00578 Eighth Example z = -0.00566. As can be seen from the aberration diagrams of each of these examples, it is preferable that the range is −0.02 <z <0. When the lower limit is exceeded, distortion can be corrected, but the meridional field curvature is overcorrected, and when the upper limit is exceeded, distortion and field curvature cannot be completely corrected.

In the optical systems shown in the above "first embodiment" to "eighth embodiment", the MTF value and the distortion at the spatial frequency of 27 lines / mm at the center of the screen and 11 lines / mm at the periphery are When the surface is flat, it is as shown in the MTF table in Table 1.

In Table 1, S and M represent a sagittal surface and a meridional surface, respectively, and Dist represents distortion.

Unlike "Example 9" to "Example 16" described below, both surfaces of the taking lens 4 are spherical, unlike the above-described Examples, and the respective aberration characteristics are similarly shown in FIG. ~ 21st
Shown in the figure.

In the optical systems shown in the above "9th Example" to "16th Example", the MTF value and the distortion at the spatial frequency of 27 lines / mm at the center of the screen and 11 lines / mm at the periphery have a flat film surface. If so, it is as shown in the MTF table in Table 2 below.

In the case where the film surface is a flat surface in the above-mentioned embodiment and the focal length f is set to 32 mm or less in the taking lens which employs an aspherical surface, the distortion exceeds 9%, and the distortion of the image abruptly. It is not so preferable because it stands out. Further, in the case of the spherical lenses of the ninth to sixteenth examples, when the film surface is a plane and the distortion exceeds 9% when the focal length is 36 mm or less, the film surface at the exposure position is shown in FIG. As described above, by slightly bending the distortion, distortion deterioration can be improved.
Therefore, the lower limit of the focal length should be 33 mm. On the other hand, it is desirable that the upper limit of the focal length is about 40 mm in consideration of the increase in the thickness of the film unit with lens.

Further, if the aperture value F determined by the taking lens 4 and the first and second apertures 41, 42 is made too dark, even if the film built in the lens-fitted film unit has a high sensitivity of about ISO400, strobe light will be emitted. However, there is a risk that the shutter speed will need to be slow, or there is a concern that camera shake will occur. Therefore, the aperture value should be limited to F16. With this, EV10 ~ 1
The brightness range of 6 can be completely covered by the latitude range of the film itself.

〔The invention's effect〕

As described above, according to the present invention, the exposure frame formed on the unit main body is loaded with a film on one side, and the other side is loaded with a film which is previously drawn out from the film cartridge and is in a roll shape. Since the exposed film is wound into the cartridge by the film winding operation, the exposed film can be taken out from the unit main body together with the cartridge in the bright room without rewinding the film after use, It is possible to simplify the work of taking out the film at the developing station. Further, in the present invention, within the limits of the single lens, the fixed diaphragm, and the fixed focus, the film is supplied at the exposure position behind the lens in consideration of the minimum circle of confusion, the MTF, and the portability of the film unit with the lens. The focal length and aperture value of the taking lens are determined in a curved state in which the concave surface faces the lens in the sending direction. Therefore, it is possible to provide a lens-fitted film unit that is capable of avoiding an increase in the size of the unit body while having a 35 mm film built-in, and that is capable of achieving sufficient performance in terms of image quality.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a lens-fitted film unit using the present invention. FIG. 2 is a sectional view of an essential part of the lens-fitted film unit shown in FIG. FIG. 3 is an external view of a film unit with a lens using the present invention. FIG. 4 is a schematic view of a taking lens system used in the lens-fitted film unit of the present invention. FIG. 5 is a graph showing the relationship between the focal length and the aperture value of the taking lens system shown in FIG. 6 to 13 are aberration characteristic diagrams of the first to eighth examples. 14 to 21 are aberration characteristic diagrams of the ninth to sixteenth examples. 1 …… Film unit with lens 2 …… Unit body 4 …… Shooting lens 20 …… Patrone 26 …… Film 41 …… First diaphragm 42 …… Second diaphragm

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiro Omura 2-26-30 Nishiazabu, Minato-ku, Tokyo Fuji Photo Film Co., Ltd. (72) Inventor Seiji Asano 1-324 Uetakecho, Omiya City, Saitama Prefecture Fuji Photo Kogaku Co., Ltd. (72) Inventor Kazunori Ohno 1-324 Uetakecho, Omiya City, Saitama Prefecture Fuji Photo Kogaku Co., Ltd. (72) Inventor Rinsei Cho 26--30, Nishiazabu, Minato-ku, Tokyo Fuji Photo-Fu (56) References JP 59-218433 (JP, A) JP 61-203433 (JP, A) Actual development Sho 55-16543 (JP, U) Dutch patent 6708486 1. Camera General Catalog No. 79 (Planning Japan Photographic Equipment Manufacturers Association Advertising Special Committee) Page 87, Page 123, Page 125 2. Nikkei Sangyo Shimbun, May 28, 1986, page 12

Claims (2)

[Claims] 1. A unit main body in which a lens and a shutter mechanism are incorporated is pre-exchangeably loaded with a patrone and an unexposed film which is drawn out from the patrone and is in a roll shape. The patrone and the roll-shaped film are respectively arranged on both sides, and after the film at the exposure position behind the exposure frame is exposed through the lens, the patrone shaft incorporated in the patrone is rotated by the film winding operation. A film unit with a lens adapted to wrap an exposed film into a film cartridge, wherein the film is a 35 mm roll film, and 24 × 36
(Mm) full-size screen is exposed, the lens is composed of a single lens, at the exposure position the film is a curved surface with a concave surface facing the lens in the feeding direction. , The focal length f of the single lens
(Mm) was in the range of 33 ≦ f ≦ 40, the aperture of the fixed when the F, lens, characterized in that the condition of ^{F ≧ f 2/150 F ≧} 34.3-0.75f F ≦ 16 is satisfied Film unit with. 2. The lens-fitted film unit according to claim 1, wherein the single lens is an aspherical surface.