JP2515314Y2 - Film unit with lens - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a film unit with a lens, and more particularly to a structure of a film unit with a lens in which a taking lens is composed of at least two lenses. .

[Conventional technology]

The applicant has provided a lens-fitted film unit (such as the product name "Sharunune Hi") so that the user can easily take a photograph even when he / she does not carry a camera. The lens-fitted film unit is a disposable camera in which the film is stored in advance, and the cost is significantly reduced as compared with a normal camera by making the main parts plastic and reducing the number of parts.

Among the disposable cameras such as the lens-fitted film unit, the Kodak panoramic camera (trade name) is known. This camera uses a wide-angle lens with a focal length of about 25 mm as a shooting lens, and shooting is performed through a 12 × 36 mm horizontally long aperture. Then, at the time of printing, printing is performed at a magnification ratio of twice that of a normal service print, and a horizontally long panoramic print is created.

By the way, in the above-mentioned panoramic camera, a two-lens taking lens is used for widening the angle of view. A space ring is inserted between the two lenses in order to keep the distance between these lenses constant. However, since the principal point of the photographing lens is also located between the two lenses, A diaphragm plate that determines the aperture diameter of the taking lens is also inserted between them, and as a result, the distance between the two lenses is maintained by the interval ring and the diaphragm plate.

[Problems to be solved by the device]

However, in order to maintain the mutual spacing between the two lenses by the thickness of both the spacing ring and the diaphragm plate, it is necessary to improve the accuracy of each of these components, which not only increases the cost of the components. The drawback is that it is troublesome to assemble.

[Purpose of device]

The present invention has been made to solve the above-mentioned drawbacks of the prior art, and an object of the present invention is to provide a lens-fitted film unit in which the structure of the spacing ring and the diaphragm plate is simplified and the cost is reduced.

[Means for solving the problem]

In order to achieve the above-mentioned object, the present invention is provided between two lenses, a spacing ring member provided with a thick portion on the outer periphery so as to keep the mutual spacing of these lenses constant, a diaphragm aperture, and A notched portion is formed by notching a part of the thick portion, and the aperture is opened and closed by moving the shutter blades in and out through the notched portion.

[Action]

As described above, the present invention can determine the mutual distance between the lenses, the aperture diameter, and the receiving surface of the shutter simply by incorporating the distance ring between the two lenses, so that the number of parts can be reduced and the efficiency of the assembling work can be improved. Can be achieved, and the cost of the lens-fitted film unit can be reduced.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

〔Example〕

FIG. 3 shows the appearance of a film unit with a lens using the present invention.
Comprises a unit body 3 and a paper box 4 covering the unit body 3. An opening is formed in a required portion of the paper box 4, and in addition to the taking lens 5 provided in the unit body 3, a viewfinder objective window 6, a shutter button 7, a counter window 8, a winding dial 9, and a fingerhold 10 are provided. It is exposed to the outside. The lens-fitted film unit 2 is photographed with a screen size of 12 × 36 mm for creating a panoramic photograph, as described later in detail. Reference numeral 11 represents a lens hood integrated with the front surface of the unit body 3.

A first showing a cross section of a main part of the film unit with lens 2
In FIG. 2 and FIG. 2 showing the disassembled state,
The unit main body 3 includes a main body portion 12, a front cover 13, and a rear cover 14. A film roll chamber 15 and a cartridge chamber 16 are provided in the main body 12 so as to sandwich the exposure frame formed on the back side thereof.
Are provided. A film 18 drawn from a cartridge 17 is stored in a roll form in the film roll chamber 15, and a winding dial 9 is provided on the film chamber 16 and is rotated counterclockwise to rotate the film. 18 can be wound around the cartridge shaft 17a.

The main body 12 has a sprocket that is partially exposed on the back surface and engages with the perforation of the film 18,
A shutter driving mechanism 26 including a kick lever 24 and a counter disk 25 is incorporated. Then, when the winding dial 9 is rotated counterclockwise to wind the film 18 by one frame, the sprocket is rotated once by following this.
The counter disc 25 is fed by one graduation and the shutter is charged, and the winding dial 9 is locked. Then, when the shutter button 7 is pressed, the kick-off lever
The tip of 24 is instantaneously moved to the right in the figure to take a picture.

An opening 28 is formed on the front surface of the main body 12, and a lens holder 30 is fitted into the opening 28. This lens holder 30
As shown in FIG. 1, the second lens 31, the spacing ring 32,
The shutter blade 38, the shutter cover 46, and the first lens 48 are assembled in this order, and finally, the retaining ring 49 is put on the lens holder 30 to fit them, and these are integrated. And
By determining the distance between the first lens 48 and the second lens 31 based on the thickness of the spacing ring 32, the wide-angle (approximately 75 ° angle of view) photographing lens 5 suitable for panoramic photographing is formed.

At the center of the spacing ring 32, a stop aperture 32a for determining the opening diameter of the photographing lens 5 is formed, and at a part of the outer periphery, a notch 32b for securing a moving path of the shutter blade 38 is formed. I have. The shutter blade 38 has a substantially V shape and is rotatably attached to a pin 51 projecting from the front surface of the main body 12 so that the aperture 32a can be opened and closed through the notch 32b.

The opening and closing of the shutter blades 38 is performed by a drive lever 52. The drive lever 52 is provided with a pin 57 implanted on the front of the main body 12.
And is urged by a spring 59 in a counterclockwise direction. The one end 52a of the drive lever 52 is connected to the kicking lever 24
In the process of the kicking lever 24 moving to the right, the kicking lever 24 rotates clockwise against the spring 59, and then returns to the original position again. Pin 52b implanted at the other end of drive lever 52
Is a slot 38 provided in a bent portion of the shutter blade 38.
a, the drive lever 52 is
When the reciprocating swing is performed, the shutter blade 38 opens and closes the aperture 32a to perform one exposure. The shutter cover 46
Serves to prevent the tip of the shutter blade 38 from dancing in the optical axis direction when the shutter blade 38 operates.

A lens holder 30 incorporating the taking lens 5, shutter blades 38, etc. is fitted into the opening 28 of the main body 12, and the drive lever is also used.
After attaching 52, these front surfaces are covered with a holding plate 50, thereby completing the assembly of the shutter and lens assembly.

An exposure frame 65 that determines the exposure range for the film 18 is provided on the back side of the main body 12. Since the opening 65a of the exposure frame 65 has a size of 12 × 36 mm, the negative screen size is also horizontally long for panoramic printing. A light shielding frame 68 is further coupled to the exposure frame 65. The aperture 68a of the light-shielding frame 68 has a size that does not block the light flux effective for shooting, and light from outside the shooting angle of view as shown by the broken line in the figure and light reflected by the inner surface of the main body 12 Block the incidence on 18. The light-shielding frame 68a is integrally connected to the exposure frame 65 by engagement of a claw and a hole as shown in the figure, and after the connection, the light-shielding frame 68a can be incorporated into the main body 12 as a single component.

The front cover 13 covering the front of the main body 12 has a photographic lens 5
There are provided an opening 75 and a finder objective window 6 for exposing the. An inverted Galileo type finder optical system is incorporated in the back of the finder objective window 6 so that a finder field for panoramic photography can be obtained without enlarging the finder objective window 6. Also, fingerhold 10
Are integrally formed on the front surface of the front cover 13.

The rear cover 14 that covers the back surface of the main body 12 is integrated with a film roll chamber 15 and a bottom plate 77 that closes the bottom of the cartridge chamber 16. By fixing this to the main body 12, the film 18
Is light tightly protected. A part 77a of the bottom plate 77 can be opened as shown in the figure, and the cartridge 17 in which the photographed film 18 is entangled is attached to the unit body 3
It can be easily taken out from. Further, the rear cover 14 is integrally formed with a support surface 78 for supporting the film 18 at the exposure position from the back side. The support surface 78 is curved as illustrated in order to reduce the influence of the distortion of the taking lens 5. Reference numeral 79 indicates a viewfinder eyepiece window, and reference numeral 80
Indicates an opening for partially exposing the winding dial 9 from the rear cover 14.

 The operation of the above configuration will be described.

When the shutter button 7 is pressed, the shutter drive mechanism 26 is released, and the kick-off lever 24 momentarily moves to the right from the cocking position shown in FIG. Then, the tip of the kick-off lever 24 kicks off one end 52a of the drive lever 52, so that the drive lever 52 rotates clockwise against the spring 59, and then returns to its original position by the bias of the spring 59 again. The swing of the drive lever 52 is caused by the pin 52b and the slot 38a.
Is transmitted to the shutter blade 38 through the shutter blade 38, and the shutter blade 38 opens and closes the aperture 32a formed in the interval ring 32 to perform one exposure.

Since the spacing ring 32 has a function of keeping the spacing between the first lens 48 and the second lens 31 constant, it is made as a highly accurate molded part. Therefore, the shutter blade 38 can be operated while slidingly contacting the front surface of the spacing ring 32, and it is not necessary to prepare a receiving surface for the shutter blade 38. Further, since the free end side of the shutter blade 38 having a substantially V shape is bent into a shape close to an arc centered on the shaft 51, it is not necessary to make the notch 32b of the spacing ring 32 too wide, and dust is prevented. It is also advantageous in trying.

The opening 65a of the exposure frame 65 is opened and closed by opening and closing the shutter blade 38.
Through 12 x 36 mm screen size is taken through. Since a light shielding frame 68 is further provided in front of the exposure frame 65,
Light from outside the angle of view that is harmful to shooting and light reflected on the inner surface of the main body 12 are cut, and the adverse effects of flare and ghost can be eliminated.

In this way, when the photographing is performed once, the lock of the winding dial 9 is released, and the film 18 can be wound. Then, while the winding dial 9 is operated to feed the film 18 by one frame, the shutter drive mechanism 26 performs the shutter charging operation via the sprocket driven by the feed of the film 18, and the kick-off lever 24 is shown in FIG. Return to the cocking position. When the film 18 is fed by one frame, the winding dial 9 is locked and the preparation for the next shooting is completed. After that, shooting and film feeding can be performed in the same manner.

Although the present invention has been described above with reference to the illustrated embodiments, the present invention is not necessarily limited to the lens-fitted film unit for panoramic photography. Further, even when the configuration of the taking lens 5 is three or more, the present invention can be applied to two adjacent lenses among them. Further, the present invention can of course be used in addition to a disposable camera.

[Effect of device]

As described above, according to the lens-fitted film unit of the present invention, the aperture opening and the notch portion are formed in the spacing ring that determines the spacing between the two adjacent lenses of the plurality of lenses forming the taking lens. Since the space ring is used as both the diaphragm plate and the receiving surface of the shutter, it is not necessary to incorporate both the space ring and the diaphragm plate between the two lenses as in the conventional case.
In addition, since it is not necessary to provide a shutter receiving surface, the number of parts and the number of assembling steps can be saved, and the mutual distance between the two lenses can be accurately determined.

[Brief description of drawings]

FIG. 1 is a sectional view of a main part of a film unit with a lens according to an embodiment of the present invention. FIG. 2 is an exploded perspective view showing a structure of a main part of the film unit with a lens according to the embodiment of the present invention. FIG. 3 is a perspective view showing the appearance of the film unit with a lens according to the embodiment of the present invention. 5 ... Shooting lens 31 ... Second lens 32 ... Interval ring 32a ... Aperture aperture 38 ... Shutter blade 48 ... First lens

Claims (1)

(57) [Scope of utility model registration request] 1. A lens-fitted film unit in which a photographic film is built in advance in a unit main body having a photographic lens composed of at least two lenses and a photographic mechanism such as a shutter blade, and is provided between the two lenses. A stop aperture and a notch formed by cutting out a part of the thick portion are formed in a spacing ring member having a thick portion on the outer circumference so as to keep the mutual distance between these lenses constant, and the cut portion is formed. A lens-fitted film unit, wherein the aperture is opened and closed by moving the shutter blades in and out through a notch.