JPH1020450A - Film unit equipped with lens - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain one-frame feeding with a simple structure while using Brownie film equipped with no perforation. SOLUTION: A shutter charging cam 47 and a winding check cam 48 are connected to a winding knob 11 through a gear 49. In a charging state, the projection of a winding check lever 45 comes into the groove of the winding check cam 48 so as to suppress the winding operation. When a shutter button 9 is depressed, the winding check lever 45 is rotated counterclockwise, then, a shutter driving lever 41 is released from being locked, then, a shutter blade 38 is rocked by the shutter driving lever 41 so as to open/close an exposure aperture 32. Simultaneously, the projection of the winding check lever 45 comes out of the groove of the winding check cam 48 and the winding operation is allowed. When the winding knob 11 is operated, a spool 24 is rotated so as to start one frame feeding of the Brownie film 16, and also, the shutter charging cam 47 and the winding check cam 48 are rotated.

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 using a brownie film.

[0002]

2. Description of the Related Art A simple exposure mechanism is provided so that anyone can easily enjoy photographing, and an unexposed photographic film and a patrone are pre-loaded at the time of manufacture, eliminating the need for cumbersome film loading and film rewinding operations. A film unit with a lens, for example, "Super Photo Run" (product name) is manufactured and sold by the present applicant. Such a film unit with a lens has the international standard IS.
It is loaded with a 135 type photographic film with a cartridge (35 mm film) specified in O. 1007-1979.

On the other hand, a medium format camera using a brownie film (a common name for a roll film having a width of 6 cm) has been in widespread use mainly for a high-amateur layer for which a better image quality is required. This means that, when the screen size of the brownie film is, for example, 6 cm × 4.5 cm (actual screen size: 56 mm × 41.5 mm), the area ratio is about 2.7 times the screen size of the 35 mm film (36 mm × 24 mm). This is because the image quality does not deteriorate even in a large-sized print photograph.

[0004]

[0005] However, even if a person who knows the pleasure of taking a picture with a film unit with a lens or a compact camera and wants to take a picture with better image quality, the medium format camera is expensive and generally used. There is a drawback that handling is difficult. The biggest factor that makes this handling difficult is the loading of the brownie film. Since the brownie film is simply a band-shaped photographic film with light-shielding paper provided on the back or both ends wound around the spool, loosening may occur immediately after tearing the paper tape for stopping. If the winding loosens,
Expose light immediately. Therefore, from immediately after the paper tape is broken to the end of loading, it is necessary to carry out the loading operation while always assisting the hand so that the brownie film does not become loose. In this way, loading brownie films is a tedious task that even a trained person uses nerves, so it was not easy to purchase a medium format camera and take pictures.

[0005] To solve this problem, as in the case of a lens-fitted photo film unit which is currently commercially available and has been loaded with a photographic film in advance, thereby eliminating the need for film loading and rewinding,
It is conceivable to provide a low-cost film unit with a lens for a brownie film in which a brownie film is pre-loaded. However, as is well known, the brownie film is not provided with perforation, so that there is a problem in that one-frame feeding control cannot be performed by a driven sprocket used in a conventional film unit with a lens.

SUMMARY OF THE INVENTION An object of the present invention is to provide a film unit with a lens capable of feeding one frame with a simple structure while using a brownie film without perforation.

[0007]

In order to achieve the above object, a film unit with a lens according to the present invention uses a brownie film having a width of about 6 cm in which no perforation is formed as a photographic film. A winding cam is provided in association with the winding knob, and the winding cam is locked each time the rotation is made, so that the first rotation of the winding cam can provide a feeding length of at least one frame of the brownie film. It is like that. Further, the number of photographable frames of the brownie film is set to 15 or less. Further, the base of the brownie film is formed of polyethylene naphthalate annealed at a temperature slightly lower than the glass transition temperature.

[0008]

FIG. 2 is a front view of a film unit with a lens according to the present invention. FIG. 2 is a perspective view of a film unit with a lens unit 2 in which a brownie film with a patrone is previously mounted and an exposure mechanism and the like are incorporated.
And an outer box 3 that covers the unit body 2. The front portion 2b of the unit body 2 has a shape protruding from the rear portion 2a, and a photographing lens 4, a strobe light emitting portion 5, and a charge switch pressing portion 6 are provided on the front surface thereof.
A pilot lamp 7 for notifying the completion of charging is exposed on the side surface. The upper central part of the rear part 2a is connected to the front part 2b to form a convex part 2c, and the objective lens 8a of the finder 8 is exposed on the front surface. A shutter button 9 is provided on the upper surface of the rear portion 2a so as to be hidden behind the front portion 2b. Also, the unit body 2
A film counter window 10 is provided on the bottom surface of.

In FIG. 3, which shows the film unit 1 with a lens from the rear side, a winding knob 11 that is rotated in one direction every time one frame is shot is exposed at the lower right of the rear part 2a. Also, a finder 8 is provided on the back surface of the convex portion 2c.
The eyepiece 8b is exposed. The outer box 3 has an opening for exposing the shutter button 9, the film counter window 10, and the winding knob 11 to the outside.

As shown in FIG. 1, the unit body 2 includes a finder 8, a body base 12, an exposure unit 13, a strobe unit 14, a brownie film 16 with a patrone 15, a front cover 17, and a rear cover 18. Have been. The brownie film 16 is a 90 μm-thick polyethylene naphthalate (hereinafter referred to as A-A) which is annealed at a temperature slightly lower than the glass transition temperature as a base.
Brownie size using PEN (width is about 6c)
m) is a photographic film, one end of which is a patrone 1
5 is fixed to a spool 24 rotatably housed in the housing 5. Further, a well-known light-shielding telem is attached to the film entrance of the patrone 15.

On the main body 12, a patrone storage chamber 21 for storing a patrone 15 and an unexposed brownie film 16 drawn from the patrone 15 in a dark room are provided on both sides of an aperture 20 arranged on the optical axis L. A film roll storage chamber 22 for storing the film roll 16a wound in a roll shape is formed (see FIG. 5). In addition,
The screen size of the aperture 20 is long in the vertical direction, for example, 5
It is a so-called 6 cm × 4.5 cm size of 6 mm × 41.5 mm.

A circular opening 21 a is formed at the bottom of the cartridge housing chamber 21, from which the key shaft of the hoisting knob 11 is inserted and engaged with the spool 24. Also,
On the side of the circular opening 21a, a reverse rotation preventing claw 26 that engages with the knurl gear 11a of the winding knob 11 to prevent the winding knob 11 from rotating in reverse is formed integrally with the main body base 12. A long box-shaped support member 28 is formed between the aperture 20 and the patrone storage chamber 21 to vertically and vertically support an elongated rod-shaped release lever 9a integrally formed below the shutter button 9. I have. A spring 29 is stretched between the support member 28 and the shutter button 9 to urge the release lever 9a in the projecting direction. In addition, a claw 9b is formed at the tip of the release lever 9a, and the inclined surface 9c is adapted to engage with a locking lever of the exposure unit 13 described later.

The mechanical base 31 of the exposure unit 13 includes
An exposure opening 32 provided in front of the optical axis L and three shafts 33, 34, 35 provided on a lower surface perpendicular to the opening 32 are formed. In front of the exposure aperture 32, the taking lens 4
Is mounted, and a shutter blade 38 is rotatably mounted between the lens holder 37 and the mechanical base 31 while being biased counterclockwise by a spring 39.

A shutter drive lever 41 and a number-of-photographs display plate 42 are rotatably inserted into the shaft 33. A stop lever 45 is rotatably inserted into the shaft 34.
The rotating body 46 is inserted into the shaft 35. This rotating body 46
In the drawings, the shutter charge cam 47, the winding cam 48, the gear 49, and the one-tooth gear 50 for counter feeding are integrally formed, although they are drawn separately from each other for convenience in the drawings. The tops of the shafts 33 to 35 are finally stopped by a common stopper plate 51. The shutter drive lever 41 is urged in the left-hand screw advancing direction by a compression torsion spring (not shown), and the winding stop lever 45 is urged clockwise by a compression torsion spring (not shown). Also,
The gear 49 has a knurl gear 11 a of the winding knob 11.
Are engaged.

When the exposure unit 13 is in the charged state, as shown in FIG. 4, the vertical projection 41a of the shutter drive lever 41 is in contact with the side surface of the vertical projection 45a of the locking lever 45 and is locked. Lever 4
The protrusion 45b of the fifth member enters the groove 48a of the stop cam 48, thereby preventing the winding operation. When the shutter button 9 is pressed down from this state, the winding stopper lever 45 is rotated counterclockwise by the inclined surface 9c of the claw 9b, and the vertical protrusion 41 is rotated.
a, 45a is released. At the next moment, the shutter drive lever 41 rotates counterclockwise to rotate the shutter blade 38.
Is kicked off, the shutter blade 38 swings, and the exposure opening 32 is opened and closed.

After kicking off the claw 38a of the shutter blade 38, the shutter drive lever 41 pivots to a position over the claw 38a (to the left of the claw 38a in FIG. 4), and the front of the vertical projection 41a (FIG. 4). Is the vertical projection 45a
Of the winding lever 45 by engaging with the rear surface (the lower surface of the drawing)
Prevents the clock from returning in the clockwise direction. In this state, the protrusions 45b of the stop lever 45 extend from the grooves 48a of the stop cam 48.
, The winding knob 11 becomes operable.

When the winding knob 11 is operated to start winding the brownie film 16, the shutter charge cam 47 rotates via the gear 49. With the rotation of the shutter charge cam 47, the outer peripheral surface of the shutter charge cam 47 presses the projection 41b of the shutter drive lever 41 to rotate the shutter drive lever 41 clockwise. As a result, the shutter drive lever 41 is rotated toward the charging position, and moves over the slope of the claw portion 38a of the shutter blade 38 by the action of the compression torsion spring.

Immediately before the shutter charge cam 47 makes one rotation, the front surface of the vertical projection 41a is disengaged from the rear surface of the vertical projection 45a, and the stop lever 45 rotates clockwise.
The protrusion 4 is formed in the groove 48a of the stopping cam 48 which has just rotated one rotation.
5b drops, the winding cam 48 is locked, and the film feeding for one frame is completed. At the same time, the projection 41b of the shutter drive lever 41 enters the recess 47a of the shutter charge cam 47, so that the shutter drive lever 41
Is about to be rotated counterclockwise, but the vertical projection 41a
Abuts on the vertical projection 45a of the stop lever 45, the shutter drive lever 41 is locked at the charging position, and the shutter is charged as shown in FIG. In addition, the winding cam 4
Since the one-tooth gear 50 makes one rotation with one rotation of 8,
The number-of-photographs display plate 42 engaged with this is fed by one tooth, and a number corresponding to the number of remaining frames that can be photographed by the brownie film 16 is displayed on the film counter window 10.

As described above, the winding knob 11 is rotated by a predetermined angle while the winding cam 48 makes one rotation, and one frame of the brownie film 16 is fed. The length of the brownie film 16 fed in one frame feed changes gradually so that the winding diameter of the spool 24 gradually increases as the film winding advances. At least one frame at the time of the first winding operation, for example, 43 mm
Are fed, so that frames do not overlap each other at the beginning of shooting with a narrow frame interval. A thin AP film is used as a base film of the brownie film 16.
Since EN is used and the diameter of the spool 24 is made sufficiently large, there is no large difference in the frame interval between the first frame and the last frame in 15 or less shots. For example, the thickness of the film is adjusted to the current roll film J120 (JIS K75).
Assuming that the diameter of the spool 24 is 22 mm, the difference between the first frame and the last frame of 15 shots is about 4.3 mm, which is about 30 mm less than that of the brownie film 16. Waste can be reduced to a degree that does not cause a problem.

A finder 8 is incorporated in the upper part of the main body base 12. The finder 8 is an Albada inverted Galileo finder composed of two objective lenses 8a and 8c and an eyepiece 8b. A field frame and the like are aluminum-evaporated on a plane far from the eye of the eyepiece 8b. And
The semi-transparent mirror is provided on the concave surface of the objective lens 8c.

Since the photographing lens 4 has a deep depth of field, and as will be described later, since the flash unit used in the conventional 135-type film unit with lens is commonly used, the 135-type lens is used. The focal length (f) is set to 4 so as to obtain the same angle of view in terms of the screen size.
It is preferable to use a wide-angle lens of 8 mm to 56 mm (corresponding to f = 30 mm to 35 mm in a screen size of 24 mm × 36 mm). In the present embodiment, a common use of a strobe unit prevents deterioration of light distribution. It was 56 mm on the narrow side of the angle of view. Also, the F of the taking lens 4
The number is, for example, F11. The shutter speed was set to about 1/160 second to prevent camera shake.

The strobe unit 14 is a conventional film unit with a lens loaded with a 135-type photographic film, for example, a unit used in "Super Photo Run" (trade name) manufactured and sold by the present applicant. The same type as that described above was used, and it was arranged above the exposure unit 13 at an angle of 90 degrees as shown in FIG. This allows
The cost can be reduced, and the strobe light emitting unit 5 is in the vertical position, which corresponds to the screen size of the aperture 20 which is vertically elongated, and can uniformly illuminate the subject in the shooting range.
Reference numeral 61 denotes a circuit board, and reference numeral 62 denotes a shutter blade 3.
8, a synchro switch short-circuited by a synchro lever 38b, reference numeral 63 denotes an AA battery for power supply, and reference numeral 64 denotes a main capacitor (see FIGS. 1 and 5). The contacts 65 and 66 for the charge switch printed on the circuit board 61 are short-circuited by an electric contact 67 fixed to the back of the charge switch pressing portion 6 (see FIG. 6).

The guide number (GN) of the strobe unit 14 is as small as about 9, but the photographing lens 4 is
1, f = 56 mm and the shutter speed is 1/160 second, so the ISO 800 is used as the brownie film 16 and considering this film latitude,
As shown in FIG. 8, a subject that satisfies the range α surrounded by the solid line has good focus (allowable circle of confusion is 0.05 mm or less) and proper exposure. The range alpha ₁ below focus range narrower than the dotted line P is one when flash photography. Also,
The range β shown for reference is the case of “Super Photo Run” (trade name) loaded with 135 type photographic film manufactured and sold by the present applicant. FIG.
The vertical axis indicates the photographic brightness (LV = Light Value) obtained by adding the sensitivity value to the object luminance value, and the horizontal axis indicates the object distance (m).

The front cover 17 has a film counter window 1
In addition to 0, the taking lens 4, the strobe light emitting section 5, the pilot lamp 7, the objective lens 8a of the finder 8, the openings 17a and 17b exposing the shutter button 9, the slit 17c forming the charging switch pressing section 6, and the winding up. A notch 17d exposing the knob 11 is formed. Also,
At the center of the rear cover 18, there is formed a pressure plate portion 18a which is curved corresponding to the field curvature of the photographing lens 4. On the left and right sides, a patrone storage room 21, a film roll storage room 2 are provided.
The lids 18b and 18c for closing each back side of the second light-tightly are provided continuously. The upper portions of the lid portions 18b and 18c are closed by a thin hinge portion to close the upper portions of the patrone storage chamber 21 and the film roll storage chamber 22.
8d and 18e are provided continuously. At the time of the development processing, the cartridge 15 containing the photographed brownie film 16 can be taken out of the cartridge storage chamber 21 without disassembling the unit body 2 by opening the lid 18d in a pull-top manner.

The lens-fitted film unit 1 constructed as described above is shipped, for example, in a position where the groove 48a of the winding cam 48 is opposed to the projection 45b of the locking lever 45 and these are not engaged. You. Therefore, the user first operates the winding knob 11 to operate the winding cam 48.
Is rotated once, and the first frame of the brownie film 16 is set in the aperture 20. At this time, one frame of the brownie film 16 longer than at least the width 41.5 mm of the aperture 20 is fed.

The subject is framed by looking through the finder 8. At this time, the distance to the subject is within the range α shown in FIG.
If you try to enter, the framed subject will be in focus. In fine weather, if the shutter button 9 is pressed down as it is, the proper exposure is obtained. However, when the room or the subject is dark, flash photography is performed.

When performing flash photography, the charging switch pressing section 6 is kept pressed with the left finger. When the pilot lamp 7 lights up, the shutter button 9 is depressed. Nail 9
When the slope 9c of b rotates the stop lever 45 to unlock the shutter drive lever 41, the shutter drive lever 41 rotates at a high speed and swings the shutter blades 38. The exposure opening 32 is opened and closed at a shutter speed of about 1/160 second, and at the same time, the synchro switch is short-circuited, and strobe light is emitted from the strobe light emitting unit 5 toward the subject.
As a result, the subject image is properly exposed to the first frame of the brownie film 16 set in the aperture 20.

Thereafter, when the winding knob 11 is operated in preparation for the photographing of the second frame, the shutter charge cam 47 is rotated via the gear 49, and the outer peripheral surface thereof presses the projection 41b of the shutter drive lever 41. To rotate the shutter drive lever 41 clockwise. As a result, the shutter driving lever 41 is rotated toward the charging position, and the claw portion 38 of the shutter blade 38 is operated by the action of the compression torsion spring.
When the vertical projections 41a and 45a are disengaged from the slope a, the locking lever 45 is rotated clockwise (see FIG. 4) by the action of the compression torsion spring. At this time, the projection 45b falls into the groove 48a of the winding cam 48 which has just made one rotation, the winding cam 48 is locked, the exposure unit 13 is charged, and the film feeding for one frame is completed.

This film feed causes the spool 24
Is rotated by a predetermined angle, a one-frame length of the brownie film 16 is wound around the spool 24, and the exposed brownie film 16 is stored in the cartridge 15. In the winding operation for setting the second frame, the brownie film 1 longer than at least the first frame is used.
6 is fed, and no accident occurs in which the first frame and the second frame overlap each other.

The length of the brownie film 16 wound on the spool 24 in one winding operation is
However, since the number of shots is set to 15, the shooting is completed before the spread of frame intervals becomes too large, and the waste of the brownie film 16 is minimized. Can be suppressed. Further, a thin AP is applied to the base film of the brownie film 16.
Since EN is used, the thickening of the spool 24 is suppressed to the minimum, and the spread of the frame interval is within an allowable range.

Thereafter, the film feeding by the operation of the winding knob 11 and the pressing operation of the shutter button 9 are repeated, and the pressing operation of the charging switch pressing section 6 is performed as necessary, thereby exposing all the frames of the brownie film 16 to light. give.
When the last frame has been shot, the winding knob 11 is continuously operated to remove the entire brownie film 16 from the patrone 15.
Then, the film unit with lens 1 is submitted to a developing store. The outer box 3 is first peeled off from the unit main body 2 of the film unit with lens 1 gathered from the developing dealer to the developing laboratory, and then the lid 18d is opened in a pull-top manner with a jig. Then, the brownie film 16 is taken out of the patrone storage chamber 21 in a state of being stored in the patrone 15.

The brownie film 16 with the patrone taken out of the patrone storage chamber 21 is processed by an automatic developing machine for development. Thereafter, the brownie film 16 is printed at the same time as the conventional 135-type film unit with lens. After the brownie film 16 is taken out, the unit body 2 is
After being transported to the inspection process, the exposure unit 13 having no abnormality, each lens of the finder 8, and the strobe unit 14 are reused, and other plastic parts are melted, pelletized, and recycled as a molding material.

In the embodiment described above, a brownie film with a patrone is used, but the present invention is not limited to this. For example, a commercially available brownie film with a backing paper (120 type) may be used. Good. In this case, for example, a spring plate or the like for holding down the film may be provided in the film take-up chamber to prevent the exposed brownie film from becoming loose.

Although the Brownie film has been shot with 15 frames, it may be shot with 30 frames, for example. In this case, the thickening of the spool is absorbed as much as possible by incorporating a friction spring into the winding knob, and the spread of the frame interval is suppressed by minimizing the increase in the film feeding length. Further, a counter display window may be provided on the front surface of the unit body. In this case, for example, a rib may be provided in a cylindrical shape on one surface of the number-of-images display plate, and a number indicating the number of images may be stamped on the outer peripheral surface of the rib.

[0035]

As described above, according to the film unit with the lens of the present invention, the winding cam is rotated by the winding operation each time one frame is shot, and at least the brownie film 1 is rotated in the first rotation. Since the feed length for each frame can be obtained, it is possible to reliably feed one frame of a brownie film with a very simple structure and no perforation, and it is easy to load and unwind the film. With this, high-quality photos with a large screen size can be taken at low cost. If the number of frames that can be photographed by the brownie film is set to 15 frames or less, the spread of the frame intervals can be reduced, and waste of the brownie film can be prevented. Further, when the base of the brownie film is formed of A-PEN, the thickness of the brownie film can be reduced, so that the spool can be prevented from being thickened and the interval between frames can be further reduced.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a unit body of a film unit with a lens according to the present invention.

FIG. 2 is an external perspective view of the lens-fitted film unit viewed from the front.

FIG. 3 is an external perspective view of the lens-fitted film unit as viewed from behind.

FIG. 4 is an explanatory view showing a film feeding structure of the exposure unit.

FIG. 5 is a sectional view of the internal structure of the unit main body as viewed from above.

FIG. 6 is a cross-sectional view of the internal structure of the unit body viewed from the side.

FIG. 7 is a sectional view of the internal structure of the unit main body as viewed from the front.

FIG. 8 shows a photographing brightness (Li
FIG. 4 is an explanatory diagram showing the overall range of the subject distance and the range of the strobe light reaching distance that are in focus with (ght Value).

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 film unit with lens 2 unit body 4 taking lens 11 hoisting knob 12 body base 13 exposure unit 14 strobe unit 15 patrone 16 brownie film 17 front cover 18 rear cover 24 spool 41 shutter drive lever 42 number-of-photographs display plate 45 wind-stop lever 46 Rotating body 47 Shutter charge cam 48 Winding cam 49 Gear

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification number Agency reference number FI Technical indication // B29D 11/00 B29D 11/00 B29K 67:00

Claims (3)

[Claims] An unexposed photographic film is pre-loaded into a unit body incorporating a simple exposure mechanism, and each time one frame is shot, a winding knob is operated to feed one frame of the photographic film. In the above, using a brownie film having a width of about 6 cm in which no perforation is formed as the photographic film, a rotation cam is allowed each time one frame is shot, and a stop cam that is locked every rotation is linked with a winding knob. A film unit with a lens, wherein a feeding length of at least one frame of a brownie film can be obtained in the first rotation of the winding cam. 2. The film unit with a lens according to claim 1, wherein the number of photographable frames of the brownie film is 15 or less. 3. The lens-fitted film unit according to claim 1, wherein the base of the brownie film is formed of polyethylene naphthalate annealed at a temperature slightly lower than the glass transition temperature.