JPH07218830A - Lens and film unit with the lens - Google Patents

Abstract

PURPOSE:To provide the lens whose angle of view is widened without various aberrations and the film unit with lens which uses this lens to imprint wide- range pictures. CONSTITUTION:A photographic lens 13 is a single lens having a positive power as the whole, and its face 13a on the object side has an aspherical shape. This lens satisfies ¦R1¦>¦R2¦, DELTAA<DELTAR, 30<=omega<=42, and Fno>8.0 where R1 and R2 are the radius no of paraxial curvature of the face 13a on the object side and that of a face 13b on the image side respectively and DELTAA and DELTAR are the extent of displacement to the center side of curvature in the effective diametral position of the aspherical face on the object side and that in the effective diametral position of the reference spherical face respectively and omega is the half angle of view and Fno is the F number.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens having a wide angle of view, and a film unit with a lens, which is capable of photographing a wide range by using this lens.

[0002]

2. Description of the Related Art A lens-fitted film unit in which a photographic film is built in advance in a unit body incorporating a photographing mechanism such as a photographing lens and a shutter device is manufactured and sold by the present applicant. This lens-fitted film unit has a very simple structure so that it can be manufactured at low cost, and it has the advantage that anyone can easily enjoy shooting and it can be provided at a low price.

In such a lens-fitted film unit, a meniscus lens having a convex surface facing the object side is generally used as a photographing lens, and in order to reduce the cost, only one or two lenses are used. It has a lens configuration. As the lens material, plastic is used so that it can be mass-produced at low cost. Therefore, the refractive index of the lens is limited, and it is difficult to reduce the Petzval sum that determines the curvature of field of the lens under the condition that the focal length is kept constant. For this reason,
The lens-fitted film unit employs a means for curving the film surface so that the film surface is concave toward the object side in order to alleviate the curvature of field that cannot be sufficiently corrected by the taking lens.

On the other hand, as known from US Pat. Nos. 4,834,306 and 4,846,418, and Japanese Patent Laid-Open No. 3-37645 by the present applicant, etc.,
In the unused state, all of the photo film is stored in the cartridge main body, and a photo film cartridge having a function of sending the photo film out of the cartridge main body by rotating the spool is proposed. This photographic film cartridge has the advantages that the photographic film can be stored in a more light-tight manner and that it can be easily handled before and after use. This photo film patrone is the same as the conventional 135
Unlike the type, it stores a 26 mm wide photographic film, and its screen size is specified to be small at 30 mm x 16.7 mm.

On the other hand, the top and bottom of the film at the photographing position are partially covered with a pair of aperture masks, and the panoramic screen (36 mm for the 135 film is 36 mm) which is horizontally long with respect to the full-size screen (36 mm for the 135 film x 24 mm).
Cameras capable of taking a picture of × 13 mm) are widely used. Even the film unit with a lens has such a panoramic shooting function as "photograph runn panoramic Hi", "photograph runn panoramic Flas
It is widely sold by the applicant as "h" (both are trade names). Then, when printing is performed from a frame of the panoramic screen as described above, the print magnification is about twice that when printing is performed from a normal full-size screen.

As described above, with the downsizing of the film itself or the downsizing of the shooting screen by panoramic shooting, it has been attempted to obtain prints of about the same size as full-size prints and panoramic prints. Then, the print magnification becomes larger than ever. Further, the downsizing of the film also requires a wide angle of the taking lens, and this widening of the taking lens is very effective for panoramic photography.

[0007]

However, in the case of a film unit with a lens in which a diaphragm and a shutter are arranged on the image side of a taking lens, a positive distortion is increased when the angle of view of the taking lens is simply widened. Become. When an attempt is made to correct this distortion, chromatic aberration of magnification occurs, and when the print magnification increases, deterioration of the photographic image cannot be avoided. It is possible to correct the above aberrations in a well-balanced manner to improve the image quality by using two taking lenses, but an increase in the number of taking lenses leads to an increase in cost, and at the time of incorporation into a camera. A high degree of accuracy will be required.

According to the present invention, without increasing various aberrations,
It is an object of the present invention to provide a lens having a wide angle of view and a lens-equipped film unit that can use this lens to project a wide range of images.

[0009]

In order to achieve the above object, the present invention has a positive power as a whole, at least the object side surface is an aspherical surface, and the paraxial surface of the object side surface. The radius of curvature is R1, the paraxial radius of curvature of the image side surface is R2,
When the displacement amounts of the aspherical surface and the reference spherical surface on the object side to the center of curvature are ΔA and ΔR, the half angle of view is ω, and the F number is F _no , the following conditional expressions are satisfied. The above single lens is used and this lens is used as a photographing lens of a film unit with a lens. | R1 |> | R2 | ΔA <ΔR 30 ≤ ω ≤ 42 F _no > 8.0

[0010]

According to the present invention, the lens as a whole has a positive power, and the conditional expression | R1 |> | R2 | is satisfied so that the image side of the lens has a stronger curvature than the object side. The corners can be widened. Further, by making at least the object-side surface aspherical and satisfying the conditional expression ΔA <ΔR, it is possible to suppress variations in various aberrations such as spherical aberration, astigmatism, and distortion, and to easily perform the correction. .

Further, by satisfying the conditional expression 30 ≤ ω ≤ 42, the photographed image incident on the exposure screen of the photographic film can be kept at an appropriate size and the aberrations can be kept in a good balance. be able to. When the value goes below the lower limit of this equation, the incident angle at the outermost angle of the light ray incident on the first surface of the lens becomes too small, so that the astigmatism increases as it deviates from the optical axis, and the field curvature accordingly. growing. On the other hand, when the value exceeds the upper limit, the total lens length with respect to the focal length becomes too long on the image plane side having a larger curvature than on the object side, and it is inappropriate to use this as a photographing lens.

Further, by satisfying the conditional expression F _no > 8.0 and making the brightness of the lens dark, it is possible to focus on a wide range from a short-distance subject to a long-distance subject without using the focusing function. In addition, since the width of the light beam entering the lens can be suppressed to be narrow, fluctuations of various aberrations can be suppressed to be small. By curving the longitudinal direction of the film surface to the back side of the camera, the field curvature peculiar to the single lens is corrected and the image quality is improved.

[0013]

EXAMPLE FIG. 5 shows an example of a lens-fitted film unit 10 using the lens of the present invention. The unit main body 11 is mainly made of plastic and is entirely covered with the outer case 12. The outer case 12 is for making the appearance of the lens-fitted film unit 10 clean, and a paper box or the like having a printed outer surface is used. The outer case 12 has a hole for exposing a taking lens 13, a viewfinder 14, a strobe light emitting section 15, a strobe charging switch 16, a shutter button 17, a winding knob 18, and a display window 19 for confirming the number of remaining films. Photographing is performed with the unit body 11 kept in the outer case 12.

As shown in FIG. 6, the unit main body 11 has a cartridge storage chamber 21 for storing the photographic film cartridge 20, and a film for storing the unexposed photographic film 22 pulled out from the photographic film cartridge 20 in a roll shape. A roll chamber 23 is formed. Further, between the cartridge storage chamber 21 and the film roll chamber 23,
An exposure frame 24 having a curved shape is formed so as to be convex toward the back side along the film feeding direction, and defines the exposure screen of the photographic film 22. Photo film 22
The exposure screen for one frame is defined as 30 mm x 16.7 mm.

On the front surface of the exposure frame 24, there is provided a dark box 25 for guiding the subject light transmitted through the taking lens 13 to the exposure frame 24. An exposure opening 26 having a shape similar to that of the exposure frame 24 is formed in the front part of the dark box 25. A shutter blade 27 for opening and closing the exposure opening 26 is rotatably provided on the front surface of the exposure opening 26, and a lens holder 28 is mounted in front of the shutter blade 27. Lens holder 2
A diaphragm opening 29 is formed at a position corresponding to the exposure opening 26 in the lens 8, and the taking lens 13 is placed so as to cover the diaphragm opening 29.

The taking lens 13 is an aspherical meniscus lens made of acrylic resin, and is formed such that the object-side surface 13a has a larger radius of curvature than the image-side surface 13b, as shown in FIG. Has been done. Also, the object side surface 1
3a is formed in an aspherical shape, and the amount of displacement at the effective diameter position of this aspherical surface is smaller than the amount of displacement of the reference spherical surface. The amount of displacement of the aspherical surface and the reference spherical surface is
As shown in FIG. 2, at the effective diameter position S on the object side, the movement amounts ΔA and ΔR from the center position T of the lens surface to the curvature center side of each surface are measured values. Positive, negative value when measured on the object side.

Further, the half angle of view ω of the photographing lens 13 is set to 30 ≦ so that a photographed image of an appropriate size can be obtained within the exposure screen of the photographic film 22 defined to be 30 × 16.7 mm.
It is preferable to be in the range of ω ≦ 42 °. Further, it is preferable that the F number is larger than 8.0 so that the pan focus can be achieved from a short-distance subject to a long-distance subject without using the focusing function.

The specifications of the first embodiment of the construction of the taking lens 13 are as follows. "First embodiment" focal length: f = 25.75 F number: F _no = 10.50 half angle of view: ω = 40.03 back focus = 26.25

The lens data of the object-side surface and the image-side surface are as shown below. "Object side""Imageside" Curvature radius -80.000 (= R1) -11.054 (= R2) Surface spacing 2.59 Effective radius 3.37 2.53 K 0.000E + 00 0.000E + 00 A -2 .056E-03-2.189E-03 B 3.491E-05 1.835E-04 C 4.205E-08 5.776E-06 D 0.000E + 00 0.000E + 00 In the above data, K, A, B, C and D respectively represent aspherical surface coefficients. The aspherical surfaces on the object side and the image side are

[Equation 1] It is formed so as to satisfy. In the formula, c represents the reciprocal of the radius of curvature, and h represents the height from the optical axis.

Further, the displacement amount ΔA of the aspherical surface and the displacement amount ΔR of the reference spherical surface at the effective diameter position S on the object side are as follows. Aspherical surface displacement amount: ΔA = −0.28463754 Reference spherical surface displacement amount: ΔR = −0.07106296

Aberration diagrams corresponding to the spherical aberration, astigmatism, and distortion of the lens of the first embodiment are respectively shown in FIG.
As shown in FIG. Further, the chromatic aberration at the position of 70% of the photographing half angle of view is as shown in the aberration diagram of FIG.

Next, regarding another embodiment of the lens structure,
The respective specifications and lens data are shown. Further, FIG. 7, FIG. 10, FIG. 13, ..., FIG. 34 show the surface shape and the optical path of the lens of each embodiment, and FIG.
FIG. 35 shows aberration diagrams of spherical aberration, astigmatism, and distortion of the corresponding examples, and FIGS.
15, ..., 36 show chromatic aberration diagrams of magnification at the 70% position of the half field angle of photography.

[Second Embodiment] Focal length: f = 25.75 F number: F _no = 9.5 half angle of view: ω = 40.03 Back focus = 25.85 "Object side""Imageside" Curvature radius -265.116 (= R1) -12.140 (= R2) Surface spacing 3.25 Effective radius 3.57 2.41 K 0.000E + 00 0.000E + 00 A-1.472E-03-1.710E- 03 B 2.644E-05 1.623E-04 C -3.833E-07 -6.993E-06 D 0.000E + 00 0.000E + 00 Aspherical variation amount: ΔA = -0.218979874 Reference spherical variation amount: ΔR = -0.02405642

[Third Embodiment] Focal length: f = 28.00 F number: F _no = 0.50 Half angle of view: ω = 37.69 Back focus = 28.51 "Object side""Imageside" Curvature radius -70.017 (= R1) -11.722 (= R2) Surface spacing 3.88 Effective radius 3.47 2.06 K 0.000E + 00 0.000E + 00 A -1.257E-03 -1.229E- 03 B 5.201E-05 1.111E-04 C -3.437E-06 -1.253E-06 D 1.089E-07 0.000E + 00 Aspherical variation amount: ΔA = -0.221559539 Variation of reference spherical surface Amount: ΔR = −0.0859168

[Fourth Embodiment] Focal length: f = 28.00 F number: F _no = 10.50 Half angle of view: ω = 37.69 Back focus = 28.00 "Object side""Imageside" Radius of curvature −5291.120 (= R1) −13.744 (= R2) Surface spacing 3.92 Effective radius 4.06 2.75 K 0.000E + 00 0.000E + 00 A −9.884E-04 −1.092E− 03 B 2.153E-05 5.734E-05 C -1.178E-06 -9.546E-07 D 3.016E-08 0.000E + 00 Aspherical variation amount: [Delta] A = -0.223698852 Reference spherical variation Amount: ΔR = −0.0015566

[Fifth Embodiment] Focal length: f = 28.80 F number: F _no = 9.50 Half angle of view: ω = 36.91 Back focus = 29.75 "Object side""Imageside" Radius of curvature −32.265 (= R1) −10.170 (= R2) Surface spacing 3.23 Effective radius 3.38 2.37 K 0.000E + 00 0.000E + 00 A −1.356E−03 −1.141E− 03 B 3.980E-05 6.447E-05 C -2.775E-06 -1.107E-07 D 1.007E-07 0.000E + 00 Aspheric variation amount: ΔA = −0.32235174 variation of reference spherical surface Amount: ΔR = −0.17752056

[Sixth Embodiment] Focal length: f = 35.00 F number: F _no = 10.50 Half angle of view: ω = 31.72 Back focus = 36.19 "Object side""Imageside" Radius of curvature -45.032 (= R1) -12.769 (= R2) Surface spacing 3.42 Effective radius 3.94 3.10 K 0.000E + 00 0.000E + 00 A -9.228E-04 -9.321E- 04 B 1.350E-05 4.337E-05 C -4.161E-07 -1.014E-06 D 8.251E-09 0.000E + 00 Aspherical variation amount: ΔA = -0.3611552 Reference spherical variation Amount: ΔR = −0.172775506

"Seventh embodiment" Focal length: f = 35.00 F number: F _no = 10.50 Half angle of view: ω = 31.72 Back focus = 36.56 "Object side""Imageside" Radius of curvature -12.474 (= R1) -7.557 (= R2) Surface spacing 1.69 Effective radius 2.65 2.31 K 0.000E + 00 0.000E + 00 A -2.332E-03 -1.840E- 03 B 1.019E-05 4.954E-05 C 0.000E + 00 0.000E + 00 D 0.000E + 00 0.000E + 00 Variation amount of aspherical surface: ΔA = −0.39415181 Variation amount of reference spherical surface: ΔR = −0.2854421138

[Eighth Embodiment] Focal length: f = 35.00 F number: F _no = 10.50 Half angle of view: ω = 31.72 Back focus = 36.23 "Object side""Imageside" Curvature radius -16.937 (= R1) -8.838 (= R2) Surface spacing 1.80 Effective radius 3.37 3.15 K 0.000E + 00 0.000E + 00 A 1.871E-03 -1.397E- 03 B 4.989E-06 0.000E + 00 C -1.359E-06 0.000E + 00 D 0.000E + 00 0.000E + 00 Aspherical variation amount: ΔA = −0.59420916 Reference spherical variation amount: ΔR = −0. 33956773

[Ninth Example] Focal length: f = 35.00 F number: F _no = 10.50 Half angle of view: ω = 31.72 Back focus = 35.72 "Object side""Imageside" Radius of curvature −51.689 (= R1) −13.184 (= R2) Surface spacing 3.24 Effective radius 4.01 3.19 K 0.000E + 00 0.000E + 00 A −8.6666E-04 −8.440E− 04 B 1.032E-05 2.843E-05 C -4.639E-07 -3.368E-07 D 1.350E-08 0.000E + 00 Aspherical variation amount: ΔA = -0.35194352 variation of reference spherical surface Amount: ΔR = −0.15540617

[0031] "Tenth Embodiment" focal length: f = 35.00 F-number: F _no = 8.00 half angle: omega = 31.72 back focus = 36.32 "object body side", "image side" Radius of curvature -42.127 (= R1) -12.685 (= R2) Surface spacing 4.82 Effective radius 4.53 3.32 K 0.000E + 00 0.000E + 00 A -5.031E-04 -4.843E- 04 B 2.208E-06 1.968E-05 C -2.466E-08 -4.279E-07 D 0.000E + 00 0.000E + 00 Aspherical variation amount: ΔA = -0.44023348 Reference spherical variation amount: ΔR = -0.24407818

[Eleventh Embodiment] Focal length: f = 35.00 F number: F _no = 10.50 Half angle of view: ω = 31.72 Back focus = 34.89 "Object side""Imageside" Radius of curvature 500.000 (= R1) -17.782 (= R2) Surface spacing 4.46 Effective radius 4.63 3.31 K 0.000E + 00 0.000E + 00 A 4.971E-04 -6.140E-04 B 3.047E-06 2.528E-05 C-3.568E-08-5.867E-07 D D 0.000E + 00 0.000E + 00 Aspherical variation amount: ΔA = −0.18500637 Reference spherical variation amount: ΔR = 0.02146515

[0033]

As described above, although the lens of the present invention has a wide angle of view of 60 ° or more, various aberrations are corrected to a favorable state. Moreover, since a wide angle of view is realized by a single lens, by using this lens as a photographing lens, it is possible to simplify the lens structure and to photograph a wide range without increasing the cost. .

[Brief description of drawings]

FIG. 1 is an optical path diagram of a lens according to a first example.

FIG. 2 is an explanatory diagram of displacement amounts at effective diameter positions of an aspherical surface and a reference spherical surface on the object side.

FIG. 3 is an aberration diagram of the lens in FIG.

4 is a diagram showing chromatic aberration of magnification of the lens of FIG. 1 at a position of 70% of a half field angle of view.

FIG. 5 is an external view of a film unit with a lens using the lens of the present invention.

6 is a sectional view of the lens-fitted film unit shown in FIG.

FIG. 7 is an optical path diagram of a lens of Example 2.

FIG. 8 is an aberration diagram of the lens in FIG.

9 is a diagram showing chromatic aberration of magnification of the lens of FIG. 7 at a position of 70% of a half field angle of view.

FIG. 10 is an optical path diagram of a lens of Example 3.

11 is an aberration diagram of the lens in FIG.

12 is a diagram showing chromatic aberration of magnification of the lens of FIG. 10 at a 70% position of a half-field of view for photographing.

FIG. 13 is an optical path diagram of a lens of Example 4.

FIG. 14 is an aberration diagram of the lens in FIG.

FIG. 15 is a diagram showing chromatic aberration of magnification of the lens of FIG. 13 at the 70% position of the half field angle of photography.

FIG. 16 is an optical path diagram of a lens of Example 5.

FIG. 17 is an aberration diagram of the lens in FIG. 16.

18 is a diagram showing chromatic aberration of magnification of the lens of FIG. 16 at a 70% position of a half field angle of photography.

FIG. 19 is an optical path diagram of a lens of the sixth example.

20 is an aberration diagram of the lens in FIG. 19.

FIG. 21 is a diagram showing chromatic aberration of magnification of the lens of FIG. 19 at the 70% position of the half field angle of view.

FIG. 22 is an optical path diagram of the lens of the seventh example.

FIG. 23 is an aberration diagram of the lens in FIG. 22.

24 is a diagram showing chromatic aberration of magnification of the lens of FIG. 22 at a 70% position of a half field angle of photography.

FIG. 25 is an optical path diagram of a lens of Example 8.

26 is an aberration diagram of the lens in FIG. 25.

27 is a diagram showing chromatic aberration of magnification of the lens of FIG. 25 at a 70% position of a half field angle of view of photography.

FIG. 28 is an optical path diagram of a lens of Example 9.

29 is an aberration diagram of the lens in FIG. 28.

FIG. 30 is a diagram showing chromatic aberration of magnification of the lens of FIG. 28 at the 70% position of the half-field of view for photography.

FIG. 31 is an optical path diagram of a lens of the tenth example.

32 is an aberration diagram of the lens in FIG. 31. FIG.

33 is a diagram showing chromatic aberration of magnification of the lens of FIG. 31 at the 70% position of the half-field of view for photography.

FIG. 34 is an optical path diagram of a lens of Example 11;

35 is an aberration diagram of the lens in FIG. 34.

36 is a diagram showing chromatic aberration of magnification of the lens of FIG. 34 at a 70% position of a half-field of view for photography.

[Explanation of symbols]

 13 Photographic Lens 22 Photo Film 27 Shutter Blade 28 Lens Holder 29 Aperture Opening

[Procedure amendment]

[Submission date] April 20, 1995

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Claim 1

[Correction method] Change

[Correction content]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Change

[Correction content]

As described above, with the downsizing of the film itself or the downsizing of the shooting screen by panoramic shooting, it has been attempted to obtain prints of about the same size as full-size prints and panoramic prints. Then, the print magnification becomes larger than ever. did
Therefore, higher performance is required for shooting lenses.
For effective panoramic shooting
Wider angles have also been achieved.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction content]

However, in the case of a film unit with a lens in which a diaphragm and a shutter are arranged on the image side of the taking lens, if the angle of view of the taking lens is simply widened, positive distortion and chromatic aberration of magnification increase. I will end up. When it is attempted to correct the distortion aberration and the chromatic aberration of magnification, it becomes difficult to correct the spherical aberration on the axis and the astigmatism off the axis.
As the print magnification increases, deterioration of the photographic image cannot be avoided. It is possible to correct the above-mentioned aberrations in a well-balanced manner and improve the image quality by using a two-photographing lens. However, an increase in the number of phototaking lenses causes an increase in cost, and at the time of incorporation into a camera. A high degree of accuracy will be required.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction content]

[0010]

According to the present invention, the lens as a whole has a positive power, and the conditional expression | R1 |> | R2 | is satisfied so that the image side of the lens has a stronger curvature than the object side. The corners can be widened. Further, the surface of at least the object-side aspherical, by satisfying the conditional expression .DELTA.A <[Delta] R, the spherical aberration, astigmatism, suppressed various yield difference such distortion, it is possible to perform the correction easily.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction content]

Further, by satisfying the conditional expression 30 ≤ ω ≤ 42, the photographed image incident on the exposure screen of the photographic film can be kept at an appropriate size and the aberrations can be kept in a good balance. be able to. If the lower limit of this formula is exceeded, the shooting angle of view will become narrower,
Off-axis distortion and lateral chromatic aberration are reduced,
The effect of asphericalizing the lens shape according to the present invention is weakened.
If the upper limit is exceeded, the shooting angle of view becomes too wide, and the present invention
It becomes difficult to correct aberration with such a single lens.

[Procedure correction 6]

[Document name to be amended] Statement

[Correction target item name] 0012

[Correction method] Change

[Correction content]

Further, by satisfying the conditional expression F _no > 8.0 and making the brightness of the lens dark, it is possible to focus on a wide range from a short-distance subject to a long-distance subject without using the focusing function. In addition, since the width of the light beam entering the lens can be suppressed to be narrow, fluctuations of various aberrations can be suppressed to be small. It should be noted that by bending the longitudinal direction of the film surface so that it is convex toward the back side of the camera, the depth of focus becomes deeper, which is acceptable.
As a result, the amount of curvature of the image plane is increased and the image quality is improved.

[Procedure Amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0014

[Correction method] Change

[Correction content]

As shown in FIG. 6, the unit main body 11 has a cartridge storage chamber 21 for storing the photographic film cartridge 20, and a film for storing the unexposed photographic film 22 pulled out from the photographic film cartridge 20 in a roll shape. A roll chamber 23 is formed. Further, between the cartridge storage chamber 21 and the film roll chamber 23,
Exposure frame 24 of the curved shape to be convex on the rear side along the film feed direction is formed, that prescribes the exposure window of the photo film 22.

[Procedure Amendment 8]

[Document name to be amended] Statement

[Correction target item name] 0016

[Correction method] Change

[Correction content]

The taking lens 13 is an aspherical meniscus lens made of acrylic resin, and as shown in FIG. 1, the object-side surface 13a has a larger radius of curvature as an absolute value than the image-side surface 13b. Is formed. The surface 13a on the object side is formed in an aspherical shape, and the amount of displacement of this aspherical surface at the effective diameter position is larger than the amount of displacement of the reference spherical surface in the negative side . Note that the displacement amounts of the aspherical surface and the reference spherical surface are values obtained by measuring the displacement amounts ΔA and ΔR from the apex T of the lens surface to the image side at the effective radius S position, as shown in FIG. The value is positive when measured, and negative when measured on the object side.

[Procedure Amendment 9]

[Document name to be amended] Statement

[Correction target item name] 0017

[Correction method] Change

[Correction content]

Further, so as to obtain a photographic image of the proper size for the exposure screen of photographs film 22, the taking lens 13
The half angle of view ω of is preferably in the range of 30 ≦ ω ≦ 42 °. Further, it is preferable that the F number is larger than 8.0 so that the pan focus can be achieved from a short-distance subject to a long-distance subject without using the focusing function.

[Procedure Amendment 10]

[Document name to be amended] Statement

[Correction target item name] 0033

[Correction method] Change

[Correction content]

[0033]

As described above, in the lens of the present invention, although the diagonal angle of view has a wide angle of view of 60 ° or more, various aberrations are corrected to a good condition. Moreover,
Since a wide angle of view is realized by a single lens, by using this lens as a photographic lens, it is possible to simplify the lens configuration and enable wide-range photography without inviting cost increase.

[Procedure Amendment 11]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 2

[Correction method] Change

[Correction content]

[Fig. 2]

Claims (2)

[Claims] 1. A photographic single lens having a positive power as a whole, wherein at least the object side surface is an aspherical surface, the paraxial radius of curvature of the object side surface is R1, and the near side of the image side is near. Let R2 be the radius of axial curvature, ΔA and ΔR be the displacements of the aspherical surface on the object side and the effective spherical surface of the reference spherical surface toward the center of curvature, the half angle of view be ω, and the F number be F _no , then | R1 A lens characterized by satisfying a condition of |> | R2 | ΔA <ΔR 30 ≦ ω ≦ 42 F _no > 8.0. 2. A lens-fitted film unit in which a film is built in advance in a unit main body in which a taking lens is incorporated, and the film is curved with its concave surface facing the object side at a taking position. A single lens having power, in which at least the object side surface is aspherical, the paraxial radius of curvature of the object side surface is R1, the paraxial radius of curvature of the image side surface is R2, and the object side aspherical surface. And ΔA and ΔR, the half angle of view is ω, and the F number is F _no , at the effective radial position of the reference spherical surface, | R1 |> | R2 | ΔA <ΔR 30 ≤ ω A film unit with a lens, which satisfies a condition of ≦ 42 F _no > 8.0.