JPH08262543A - Film unit with lens - Google Patents

Abstract

PURPOSE: To precisely and surely position two lenses, to attach them to a unit main body and to cut excessive external light and to reduce the actuating amount of a sector by making a distance to the sector from a photographing lens short in a film unit having the photographing lens consisting of two lenses attached. CONSTITUTION: The film unit with a lens constituted so that the photographing lens 10 consisting of two lenses is attached is provided with flange parts 110 and 120 on the circumferential edges of both lenses 11 and 12. Then, the first lens 11 on an object side and the second lens 12 on an image surface side are positioned in an optical axis direction and in a vertical direction to the optical axis direction by using the flange parts. Besides, the photographing lens 10 is positioned with respect to the unit main body by using only the flange part 120 provided on the circumferential edge of the second lens 12 on the image surface side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film unit with a lens, in which a two-lens taking lens is mounted.

[0002]

2. Description of the Related Art A lens-equipped film unit is a simple camera unit in which a cartridge is loaded in advance at the time of assembly, the film is wound up at every photographing, and the photographed film is taken out and developed at a developing station. The photographic lens mounted on the lens-equipped film unit generally has an aperture ratio of F: 10 to 11, but in recent years, a bright photographic lens having an aperture ratio of F: 8 has been used. In such a bright photographing lens, a two-lens configuration lens is used.

In a conventional lens-equipped film unit using a two-lens taking lens, the outer diameter portion of each of the two lenses is loaded and held in the cylindrical inner diameter portion of the lens receiving portion of the unit body. Therefore, both the positioning in the direction perpendicular to the optical axis of the lens and the positioning with respect to the unit body have been performed.

Further, in the conventional lens, in order to prevent the lens surface from being scratched, the flange at the peripheral portion of the lens is formed at a position higher than the lens surface.

[0005]

As described above, when the outer diameter portion of the lens for each of the two lenses is loaded and held in the cylindrical inner diameter portion of the lens receiving portion of the unit body, the first lens, With respect to each of the second lenses, the optical axes of the lenses are deviated due to the gap between the outer diameter portion of the lens and the cylindrical inner diameter portion of the lens receiving portion, which adversely affects the resolution.

On the rear side (image side) of the taking lens,
If the aperture value switching means and the like are provided, the distance from the lens to the sector provided further behind the aperture value switching means becomes longer in the conventional lens flange. When the distance between the lens and the sector becomes long, a large amount of extra external light enters, which causes flare and the like. Further, since the sector comes to a position where the photographing light flux spreads behind the convergent position, it is necessary to increase the operation amount of the sector, and there is a problem that the sector itself becomes large.

[0007]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and in a film unit with a lens equipped with a two-lens taking lens, firstly, The purpose of the present invention is to accurately and surely position the lens so that the lens can be mounted on the unit body. Secondly, by shortening the distance from the photographing lens to the sector, it is intended to cut off excess external light and reduce the operation amount of the sector. The above object is to provide a film unit with a lens in which a taking lens having a two-lens structure is mounted, and flange portions are provided on the peripheral edges of both lenses, and the first lens on the object side and the first lens on the image plane side are formed by using the flange portions. This is achieved by a film unit with a lens, which performs positioning in the optical axis direction with two lenses and in a direction perpendicular to the optical axis.

The above object is also achieved by a lens-equipped film unit characterized in that the photographing lens is positioned with respect to the unit body only by the flange provided on the peripheral edge of the second lens on the image plane side.

Further, the above object is such that, from the object side, a first meniscus lens having a convex lens surface facing the object side and a concave lens surface facing the image surface side, and a first meniscus lens having a concave lens surface facing the object side and a convex lens surface facing the image surface side are provided. In the lens-equipped film unit including a photographic optical system including two meniscus lenses, the first meniscus lens has a flange portion outside the photographing optical path, and the flange portion has an optical axis on the periphery of the convex lens surface. A first flange surface for pressing the lens having a surface perpendicular to the outer peripheral surface having a cylindrical surface parallel to the optical axis extending from the first flange surface to the image surface side, and a peripheral edge of the concave lens surface. An abutting surface perpendicular to the optical axis,
A fitted surface extending vertically from the abutted surface to the image surface side,
A second flange surface extending perpendicularly to the outer peripheral surface from the fitted surface, wherein the second meniscus lens has a flange portion outside the photographing optical path, and the flange portion is provided on the periphery of the concave lens surface. A first abutting surface having a surface perpendicular to the axis and abutting the abutted surface; and a length of the abutted surface in the optical axis direction that extends perpendicularly from the first abutted surface to the image surface side. Longer than the first fitting surface, a third flange surface extending perpendicularly to the lens outer peripheral surface direction from the first fitting surface, and a second abutment provided on the peripheral edge of the convex lens surface and perpendicular to the optical axis. A surface and a second fitting surface that extends perpendicularly to the object side from the second abutting surface and connects to the third flange surface, and abuts the abutted surface and the first abutting surface. The mating of the mating surface and the first mating surface with respect to the second meniscus lens. A film with lens, characterized in that the meniscus lens is positioned in the optical axis direction and a direction perpendicular to the optical axis, and the unit main body is positioned by the second butting surface and the second fitting surface. Accomplished by a unit.

Still further, the above object is to provide a lens-equipped film unit equipped with a two-lens taking lens, wherein the abutting surface of the second lens on the image side attached to the receiving surface of the substrate of the unit main body is This is achieved by a film unit with a lens, which is located closer to the object side than the apex of the image surface side lens surface of the two lenses.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to FIGS.

First, an example of a film unit with a lens used in the present invention will be described with reference to FIGS. FIG.
Is a plan sectional view for explaining the internal structure of the film unit with lens, FIG. 2 is a partially enlarged sectional view showing a peripheral member of the taking lens and an optical path, FIG. 3 is an enlarged sectional view of the taking lens and peripheral members, and FIG. FIG. 3 is an assembled sectional view and an exploded sectional view of FIG.

The lens-fitted film unit 1 is a simple camera unit that is put on the market with a photographic film (hereinafter referred to as film) loaded, and the film is loaded in the lens-fitted film unit assembly process.
The user does not need to load or rewind the film, and can shoot immediately.

In FIG. 1, the lens-fitted film unit 1 is constructed by assembling a front cover 3 and a rear cover 4 from both sides to a main body 2. A shooting frame 5 is provided in the center of the main body 2, and a cartridge chamber 6 is provided on one of the left and right sides of the shooting frame 5 and a film roll chamber 7 is provided on the other side. A cartridge 8 is loaded in the cartridge chamber 6, a film F wound around a spool 9 is stored in the film roll chamber 7, and the film F is wound around the cartridge 8 by a winding mechanism (not shown) at the time of photographing. The hoisting mechanism is composed of a hoisting knob 20 and the like, and is arranged from above the cartridge chamber 6 to above the photographic frame 5. On the front side of the photographic frame 5, there are two lenses, a first lens 11 and a second lens 12. The taking lens 10 is provided.

2 and 3, the taking lens 10 is shown.
Is positioned and fixed to the lens holding substrate 13 on the front side of the main body 2. An opening 131 is formed in the center of the lens holding substrate 13 so that the photographing light flux passes therethrough. The opening 1
On the front side (object side) of the periphery of 31 is an abutting reference surface 132 for abutting and positioning an abutting surface (mounting surface) of the taking lens 10, and an outer diameter surface of the taking lens 10. A lens mounting portion including a fitting reference surface 133 having a cylindrical inner diameter surface for positioning is provided.

Behind the lens holding substrate 13 (on the image plane side)
Is a movable diaphragm blade 1 connected to the diaphragm value switching means.
5, fixed diaphragm plate 16, movable sector (shutter blade)
Are arranged in sequence. In addition, the lens holding substrate 13
In front of the lens mounting portion (on the object side), a lens pressing member 1 for pressing and fixing the front surface of the shooting lens to be mounted.
4 is attached.

FIG. 4 is an assembled sectional view and an exploded sectional view of the taking lens. The taking lens 10 according to the present invention has a two-lens structure including a first lens 11 and a second lens 12. First
The lens 11 is a first meniscus lens including a first surface 111 having a convex lens surface (including an aspherical lens surface) facing the object side (object side) and a second surface 112 having a concave lens surface on the image side. is there. The second lens 12 is a second meniscus lens including a third surface 121 having a concave lens surface facing the object side (subject side) and a fourth surface 122 having a convex lens surface on the image side.

The first lens (first meniscus lens)
A flange portion 110 is provided at a portion of the periphery of 11 outside the photographing optical path.
Are formed. The flange portion 110 includes a first lens pressing first flange surface 113 having a surface perpendicular to the optical axis on the periphery of the first surface (convex lens surface) 111, and an image surface side from the first flange surface 113. An outer peripheral surface 114 having a cylindrical surface parallel to the extending optical axis, an abutted surface 115 that is a peripheral edge of the second surface (concave lens surface) 112 and is perpendicular to the optical axis, and from the abutted surface 115. It comprises a fitted surface 116 that extends vertically toward the image plane side, and a second flange surface 117 that extends perpendicularly from the fitted surface 116 to the outer peripheral surface 114.

The second lens (second meniscus lens)
A flange portion 120 is provided at a portion of the periphery of 12 outside the photographing optical path.
Are formed. The flange portion 120 has a first abutting surface 125 that has a surface perpendicular to the optical axis at the periphery of the third surface (concave lens surface) 121 and abuts against the abutted surface 115, and the first abutting surface 125. A first fitting surface 126 that extends vertically from the contact surface 125 to the image surface side and is longer than the length of the fitted surface 116 in the optical axis direction, and extends vertically from the first fitting surface 126 in the lens outer peripheral surface direction. The third flange surface 127, a second abutting surface 123 provided on the periphery of the fourth surface (convex lens surface) 122 and perpendicular to the optical axis, and extends vertically from the second abutting surface 123 to the object side. Second fitting surface 124 connected to the third flange surface 127.

The abutting surface 115 of the first lens 11
And the first abutting surface 125 of the second lens 12 are brought into contact with each other, and the mating surface 116 and the first mating surface 126 are fitted to each other, whereby the first lens 11 with respect to the second lens 12 is fitted. Positioning is performed in the optical axis direction and in the direction perpendicular to the optical axis. The second butting surface 12 of the second lens 12
3 and the second fitting surface 124, it is possible to perform positioning with respect to the lens mounting portion including the butting reference surface 132 and the fitting reference surface 133 of the lens holding substrate 13 of the unit body.

The position of the abutting reference surface 132 of the lens holding substrate 13 in the optical axis direction is located on the object side of the rearmost portion of the second lens 12 on the image surface side, that is, the convex lens surface vertex 128 of the fourth surface. Set. This makes it possible to shorten the distance from the apex 128 of the convex lens surface to the sector 17 and prevent extraneous external light from entering the photographing optical path. Further, since the sector 17 can be arranged in the vicinity of the position where the photographing optical path converges, the sector 1
Since the opening / closing operation amount of 7 is small and the sector 17 itself is small, it is effective in reducing the size and weight of the unit.

[0022]

As described above, according to claims 1 to 3,
According to the invention, in a lens-equipped film unit equipped with a two-lens taking lens, the two lenses can be accurately and reliably positioned with respect to each other, and can be accurately mounted on the lens holding substrate of the unit body. Is possible.

According to the invention of claim 4, the distance from the photographing lens to the sector is shortened to cut off extraneous external light, and the operation amount of the sector is reduced, thereby reducing the size of the unit. It is effective for weight reduction.

[Brief description of drawings]

FIG. 1 is a plan sectional view illustrating an internal configuration of a film unit with a lens.

FIG. 2 is a partially enlarged sectional view showing a peripheral member of a taking lens and an optical path.

FIG. 3 is an enlarged cross-sectional view of a taking lens and peripheral members.

FIG. 4 is an assembled sectional view and an exploded sectional view of a photographing lens.

[Explanation of symbols]

 1 Film Unit with Lens 2 Main Body 10 Photographic Lens 11 First Lens (First Meniscus Lens) 110, 120 Flange Part 111 First Surface Convex (Lens Surface) 112 Second Surface (Concave Lens Surface) 113 First Flange Surface 114 Outer Surface 115 abutted surface 116 fitted surface 117 second flange surface 12 second lens (second meniscus lens) 121 third surface (concave lens surface) 122 fourth surface (convex lens surface) 123 second abutted surface 124 second Fitting surface 125 First butting surface 126 First fitting surface 127 Third flange surface 128 Convex lens surface vertex 13 Lens holding substrate 131 Opening 132 Butting reference surface 132 Fitting reference surface 14 Lens pressing member 15 Aperture blade (aperture) Value switching means) 16 Fixed diaphragm plate 17 Sector

Front page continued (72) Inventor Toshihiko Kiriki 2970 Ishikawa-cho, Hachioji, Tokyo Konica stock company (72) Inventor Nobuyoshi Mori 2970 Ishikawa-cho, Hachioji, Tokyo Konica stock company (72) Inventor Hiroshi Kibayashi To Konica Stock Association, Sakura-cho, Hino City, Tokyo

Claims (4)

[Claims] 1. A lens-equipped film unit equipped with a two-lens taking lens, wherein flanges are provided on the peripheral edges of both of the lenses, and the first lens on the object side and the image plane side are formed by using the flanges. A film unit with a lens, which performs positioning in the optical axis direction with the second lens and in a direction perpendicular to the optical axis. 2. A lens-equipped film unit equipped with a two-lens taking lens, wherein the taking lens is positioned with respect to the unit body only by a flange provided on the periphery of the second lens on the image side. A film unit with a lens. 3. A first meniscus lens having a convex lens surface facing the object side from the object side and a concave lens surface facing the image side,
In a lens-equipped film unit including a photographic optical system configured by a second meniscus lens having a concave lens surface facing the object side and a convex lens surface facing the image surface side, the first meniscus lens has a flange portion outside the photographic optical path. And a first flange surface for pressing the lens, which has a surface perpendicular to the optical axis on the periphery of the convex lens surface, and is parallel to the optical axis extending from the first flange surface to the image surface side. An outer peripheral surface having a cylindrical surface, an abutted surface that is a peripheral edge of the concave lens surface and is perpendicular to the optical axis, a fitted surface that extends perpendicularly from the abutted surface to the image surface side, and the abutted surface. A second flange surface extending perpendicularly to the outer peripheral surface from the fitting surface, wherein the second meniscus lens has a flange portion outside the photographing optical path, and the flange portion is provided on the optical axis at the periphery of the concave lens surface. To the vertical plane A first abutting surface that abuts the abutted surface, and a first fitting surface that extends perpendicularly from the first abutting surface to the image surface side and that is longer than the length of the fitted surface in the optical axis direction. A third flange surface extending perpendicularly to the lens outer peripheral surface direction from the first fitting surface, a second abutting surface provided on the peripheral edge of the convex lens surface and perpendicular to the optical axis, and a second abutting surface A second fitting surface that extends perpendicularly to the object side from the first fitting surface and is connected to the third flange surface, the abutting surface and the first abutting surface, and the fitting surface and the first fitting surface. By fitting with the mating surface, positioning of the first meniscus lens with respect to the second meniscus lens in the optical axis direction and in a direction perpendicular to the optical axis is performed, and the second butting surface and the second fitting surface A lens-equipped fill characterized by positioning with respect to the unit body substrate by Unit. 4. A lens-equipped film unit equipped with a two-lens taking lens, wherein the abutting surface of the second lens on the image surface side, which is attached to the receiving surface of the substrate of the unit body, is the image surface of the second lens. A film unit with a lens, which is located on the object side from the apex of the side lens surface.