JP2000227646A - Film unit with lens - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an excellent-quality printed photograph obtained by excellently synthesizing a pre-exposure image and an object image without causing a black line and a clear white line by setting a gap in an optical axis direction between the edge for restricting photographing light of a light shielding mask covering a pre-exposure area and the front of a photographic film within a specified range. SOLUTION: When the focal distance of a photographing lens is defined as (f)mm and a diaphragm value is defined as F, the gap (x)mm in the optical axis direction between the edge for restricting photographing light of the light shielding mask covering the pre-exposure area and the front of the photographic film is set within the range of 0.1f/[(f/F)+0.1]<=x<=f/[(f/F)+1.0]. That means, the edge for restricting photographing light 33a of the light shielding mask 33 is separated from the front of the photographic film 16 by the gap (x). Then, an area 48 on which photographing light which is not cut by the edge 33a is made incident is widened by width H in a direction shown by an arrow A along in a direction toward the pre-exposure area 18a from a photographing area 18b. The quantity of the incident light is gradually reduced in the direction shown by the arrow A, that means, toward the area 18a.

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, and more particularly, to a film unit with a lens for exposing a subject image to a photographic film on which a pre-exposure image has been previously exposed and combining the pre-exposure image with the subject image. Things.

[0002]

2. Description of the Related Art A film unit with a lens in which a photographic film is pre-loaded in a unit body having a built-in simple photographing mechanism is manufactured and sold by the present applicant. In addition, an image of a character or a manga character (hereinafter, referred to as a pre-exposure image) is pre-exposed to a part of the photographing frame of the loaded photo film at the time of manufacture, and a subject image is subjected to multiple exposure on the photo film. For example, as a film unit with a lens that enables the user to easily enjoy image composition, for example, “Print Collection” (product name) is manufactured and sold by the present applicant.

In a film unit with a lens for obtaining a composite image by such multiple exposure, a light-shielding mask is arranged so as to face the pre-exposure area where the pre-exposure image is exposed and to be in close contact with the photographic film. Have been. The pre-exposure area is shielded from the photographing light from the photographing lens by the light-shielding mask, and the subject image is photographed in the photographing frame without overlapping the pre-exposure image.

[0004]

The edge of the light-shielding mask for defining the edge on the pre-exposure area side of the subject image and the edge of the pre-exposure image on the subject image side should not be misaligned. However, it is extremely difficult in manufacturing to completely match the edge of the light-shielding mask with the edge of the pre-exposure image, and it is inevitable that a positional shift occurs. This positional deviation is caused by, for example, the deviation of the exposure position of the pre-exposure image during the pre-exposure, the manufacturing accuracy of the photographic film such as an error in the width of the photographic film, and the stop position at the time of one frame feeding of the photographic film in the unit body. This occurs due to misalignment of the photographic film, misalignment of the photographic film due to play provided in the width direction of the photographic film, manufacturing accuracy of the film unit with a lens, and the like.

For example, when the pre-exposure image is misaligned so as to protrude from the edge of the light-shielding mask, the subject image is double-exposed to a part of the pre-exposure image. When the pre-exposure image is misaligned in the opposite direction, a line-shaped unexposed portion is formed between the pre-exposure image and the subject image. The double-exposed portion gives a substantially appropriate exposure amount for each of the pre-exposed image and the subject image, so that a clear white line is formed on the printed photograph, and the unexposed portion is black on the printed photograph. It becomes a line. As described above, when a positional deviation occurs between the edge of the light-shielding mask and the edge of the pre-exposure image, there is a problem that a white line or a black line appears and makes a printed photograph unsightly.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and makes a white line generated due to a positional shift between an edge for restricting a photographing light of a light-shielding mask and an edge of a pre-exposure image inconspicuous. It is an object of the present invention to provide a film unit with a lens that can prevent black lines from appearing and that can increase the allowable range of positional deviation between an edge for restricting shooting light of a light-shielding mask and an edge of a pre-exposure image. .

[0007]

In order to achieve the above object, a film unit with a lens according to the present invention covers a pre-exposure area when a focal length of a taking lens is f (mm) and an aperture value is F. The distance x (mm) in the optical axis direction between the photographing light limiting edge of the light-shielding mask and the front surface of the photo film is defined as 0.1 f / ((f / F) +0.1) ≦ x ≦ f / ((f / F)
+1.0).

[0008]

FIG. 2 shows an appearance of a film unit 2 with a lens according to the present invention. The lens-fitted film unit 2 includes a unit main body 3 in which various photographing mechanisms are incorporated, and an exterior paper 4 partially covering the unit main body 3, and the unit main body 3 is loaded with a film cartridge in advance. In the film unit 2 with a lens, each photographing frame is loaded with a photographic film in which a pre-exposure image is pre-exposed at the time of manufacturing. By photographing the photographic film, a subject image and a pre-exposure image are obtained in the photographing frame. Is synthesized. As a result, from the photographed and developed photographic film, a print photograph in which the pre-exposure image is synthesized under the subject image can be obtained.

On the front surface of the unit body 3, a photographing lens 5, an object side window 6a of a finder 6, a strobe light emitting section 7,
A strobe operation member 8 for switching the strobe unit on and off is provided. On the top surface, a release button 9 and a counter window 1 for displaying the remaining number of recordable images are displayed.
0, an opening 12 from which a display light guide 11 for indicating completion of strobe charging is provided. further,
On the back side of the unit body 3, a winding knob 13 that is rotated for each frame is exposed, and an eyepiece window 6b (see FIG. 4) is provided at a position facing the objective window 6a.

FIG. 3 shows the film cartridge in a state where the photo film is pulled out from the cartridge shell. The film cartridge 14 is a commercially available IX2
It is of a forty type and comprises a cartridge shell 15 and a negative type photo film 16. A spool 17 (see FIG. 4) in which one end of the photo film 16 is locked is rotatably incorporated in the cartridge shell 15, and the photo film 16 is rotated from the inside of the cartridge shell 15 by the rotation of the spool 17 in the film feeding direction. And a light-shielding lid for opening and closing the film feed port of the photographic film 16.

The photographic film 16 includes a plurality of photographing frames 18.
Are partitioned into rectangles. This shooting frame 18
Has a screen size of 30.2 × 16.7 mm. The photographic film 16 has perforations 19 arranged along one side edge. Each of the photographing frames 18 is provided with a perforation 19 on the front side and the rear side in the film feeding direction.

In the photographic film 16 used in the film unit 2 with a lens, the inside of each photographing frame 18 is divided into a pre-exposure area 18a and a photographing area 18b. The upper side of the boundary line indicated by reference numeral 18c is the pre-exposure area 1
8a, the lower side is a shooting area 18b. The pre-exposure area 18a has a long rectangular shape along the longitudinal direction of the photographing frame 18. Note that the boundary line 18c is virtual, and is not recorded on the photo film 16.

In the pre-exposure area 18a, manga characters, landscape photographs and images of tourist spots, characters, and the like are pre-exposed as pre-exposure images during manufacturing. Accordingly, a latent image is formed in the pre-exposure area 18a by being exposed before photographing. When one of the photographing areas 18b is photographed by operating the release button 9, exposure is given by photographing light from the photographing lens 5, and a subject image is formed as a latent image. The pre-exposure image and the subject image are revealed by subjecting the photographic film 16 to a development process, and printed on photographic paper to obtain a print photograph of a combined image in which the pre-exposure image and the subject image are combined.

The viewfinder 6 has a finder field of view adjusted so that the photographing range exposed to the photographing area 18b can be observed. Note that a pre-exposure image may be displayed in the finder visual field so as to be observed together with the subject.

As shown in FIG. 4, the unit main body 3 includes a front cover 20, a main body base 21, a strobe unit 22, a battery 23, a rear cover 24, and the like. A dark box 26 for shielding a photographing optical path from the photographing lens 5 to the photographic film 16 is integrally formed in the center of the front surface of the main body base 21. On both sides of the dark box 26, a cartridge chamber 27 in which the cartridge shell 15 is stored,
A film chamber 28 in which the photo film 16 pulled out from the cartridge shell 15 and wound into a roll is stored is provided integrally. In order for the pre-exposure image to appear below the subject image on the printed photograph, the photographic film 16 is loaded with the perforation 19 side, that is, the posture in which the pre-exposure area 18a is on the upper side.

Outside the dark box 26, various components constituting a shutter mechanism and a film counting mechanism for driving shutter blades in response to a pressing operation of the release button 9, a charge completion display member 11, a finder lens 30, a shutter The cover 31, the photographing lens 5, and the like are attached. Dark box 2
An aperture for defining the screen size of the photographing frame 18 on the photo film 16 is formed on the back of the photo film 6, and a flare prevention frame 32 for preventing the occurrence of flare is formed inside the dark box 26;
Light shielding mask 3 for shielding the pre-exposure area 18a from photographing light
3 are arranged. Flare prevention frame 32 and light shielding mask 3
3 is a single component integrally formed, but may be separate components.

A winding knob 13 is rotatably mounted on the upper part of the cartridge chamber 27. A drive shaft that engages with the end of the spool 17 of the cartridge shell 15 is integrally formed on the lower surface of the winding knob 13. By rotating the winding knob 13, the photographed portion of the photographic film 16 is wound into the cartridge shell 15. The upper surface of the cartridge chamber 27 and the winding knob 13
A light-shielding lid closing mechanism (not shown) that detects that the photographic film 16 has all been wound up in the cartridge shell 15 and turns the light-shielding lid of the cartridge shell 15 to the closed position is incorporated between them. I have.

The front cover 20 has a viewfinder 6 on its front surface.
The objective side window 6a, the photographing lens opening 20a for exposing the photographing lens 5, and the opening 20 for exposing the strobe light emitting section 7
b, an opening 20c for exposing the flash operating member 8 and the like are formed, and cover the front surface of the main body base 21.

The rear cover 24 is attached so as to cover the rear surface of the main body base 21. Thereafter, the bottom cover 2 that covers the bottom surfaces of the cartridge chamber 27 and the film chamber 28 is provided on the cover 24.
4a and 24b are integrally formed. After attaching the rear cover 24 to the main body base 21 in which the film cartridge 14 is loaded, the bottom lids 24a and 24b are closed, and the inside of the cartridge chamber 27 and the film chamber 28 are light-tightly closed. The bottom cover 24a is opened when the photographed film cartridge 14 is taken out at the developing laboratory. Further, a support plate 24c is provided at a portion of the rear cover 24 facing the aperture of the dark box 26. The support plate 24c has a curved shape for correcting the field curvature of the photographing lens 5, and supports the photographic film 16 behind the aperture in a curved manner.

The strobe unit 22 includes a printed circuit board 22a on which various electric parts are mounted to form a strobe circuit, and a strobe light emitting unit 7 including a discharge tube, a reflector, a diffusion plate, and the like. Printed circuit board 22
a includes a synchro switch 22b that is turned on in synchronization with the opening and closing operation of the shutter blades to perform strobe light emission, a switch 22c that is turned on / off by a slide operation of the strobe operation member 8, and a metal that connects the battery 23 to the strobe circuit. A contact piece 22d and the like are attached.

Between the strobe unit 22 and the front cover 20, a switch plate 37 integrally formed with the strobe operation member 8 and a receiving plate 38 for supporting the switch plate 37 slidably are incorporated. The switch plate 37 is
When it is slid upward, the switch 22c on the printed circuit board 22a is turned on. When the switch 22c is turned on, strobe charging is performed by the strobe circuit,
Strobe light emission is allowed. The switch plate 37 is
Charging completion display member 11 assembled on the side of dark box 26
Is engaged. When the strobe operation member 8 is slid upward, the charging completion display member 11 moves upward in conjunction with this, and projects from the opening 12 on the upper surface of the unit main body 3.

An LED that emits light when flash charging is completed is attached to the printed circuit board 22a. The charging completion display member 11 is a light guide formed of a transparent plastic, and internally reflects the light output from the LED and guides the light to the outside of the lens-equipped film unit 2 to prepare the photographer and the subject for photographing. Notify that has been completed.

As shown in FIG. 5, a shutter opening 40 is provided on the front surface of the dark box 26 for allowing photographic light to enter the dark box 26, and an aperture 41 is formed on the back surface of the dark box 26. The back side of the dark box 26 is curved so as to project to the back side of the unit body 3. Aperture 41
Has the same size as the photographing frame 18 and is open. At the upper and lower portions of the aperture 41, a film rail 42 for supporting the upper and lower ends of the photographic film 16 is provided. The photographic film 16 set behind the aperture 41 is supported between the film rail 42 and the support plate 24c of the rear cover 24 in a curved shape.

A shutter blade 43 for opening and closing the shutter opening 41 is swingably mounted on the front surface of the dark box 26. The shutter blade 43 is urged by a spring (not shown) in a direction to close the shutter opening 40.
In the shutter cover 31 that covers the shutter blade 43, an aperture opening 44 is formed at a portion facing the shutter opening 40 with the shutter blade 43 interposed therebetween. Shutter cover 31
A lens barrel 31a is formed around the aperture opening 44 on the front surface of the lens barrel 31a. The taking lens 5 is fitted into the lens barrel 31 a and is held by the front cover 20.

When the release button 9 is pressed, the shutter blades 43 move the shutter opening 4 against the bias of the spring.
After the shutter opening 40 is fully opened, the spring is turned in a direction to close the shutter opening 40 by a spring. By one reciprocating swing of the shutter blade 43,
The shutter opening 40 is opened and closed. This shutter opening 43
During opening and closing of the camera, the photographing light transmitted through the photographing lens 5 and emitted from the aperture opening 44 is transmitted from the shutter opening 40 to the dark box 26.
To expose the photographic film 16.

As described above, the anti-flare frame 32 and the light-shielding mask 33 are arranged inside the dark box 26. The anti-flare frame 32 cuts out of the incident light from the aperture opening 44 that does not contribute to photographing, so that the dark box 26
The reflection of the incident light by the inner surface of the lens is suppressed to prevent the occurrence of flare. The light-shielding mask 33 has a rectangular plate shape elongated in the longitudinal direction of the aperture 40, and is arranged above the aperture 41 so as to face the pre-exposure area 18a.

The pre-exposure image is accurately positioned and pre-exposed to the pre-exposure area 18a, but the occurrence of positional deviation is inevitable. Even if the pre-exposure image is correctly pre-exposed on the pre-exposure area 18a, the photographic film 16 is displaced in the unit main body 3 and the light-shielding mask 3
In some cases, the pre-exposure image may be misaligned with respect to 3. When the pre-exposure image is displaced in this way, especially along the direction from the photographing area 18b to the pre-exposure area 18a, the film unit 2 with the lens is in the direction along the short side of the photographing frame 18 (the photographic film When the position shift occurs in the width direction), an unexposed portion occurs between the subject image and the pre-exposure image, or the subject image and the pre-exposure image overlap, and when a print photograph is created, a black line or a clear line appears. A white line appears.

The conventional light-shielding mask is almost in close contact with the front surface of the photographic film 16, and also clearly exposes the edge of the subject image on the pre-exposure area side for the photographic light limiting edge, and positions the edge. For the purpose of definition, the photo film 16 is disposed in close contact with the front surface of the photographic film 16 so as to face the boundary 18c between the pre-exposure area 18a and the photographing area 18b. However, this lens-equipped film unit 2
Then, in order to prevent the above-mentioned black line and clear white line from appearing in the printed photograph, the edge 33a for restricting the photographing light of the light shielding mask 33 is provided at a predetermined distance from the front of the photographic film 16 toward the photographing lens 5 side. They are arranged at intervals so that a part of the photographing light enters near the boundary 18c between the pre-exposure area 18a and the photographing area 18b.

Reference numeral 46a in FIG.
4 is emitted from the upper side, and the edge 33 of the light shielding mask 33 is emitted.
Reference numeral 46b denotes an optical path of the photographing light that passes through the vicinity of the edge 33a and passes through the vicinity of the edge 33a.

FIG. 1 is an enlarged view of the edge 33a, as shown in FIG.
Are separated from the front surface of the photographic film 16 by an appropriate distance x. Thereby, the pre-exposure area 18a and the photographing area 1
A part of the photographic light heading near the boundary line 18c with the 8b is cut by the edge 33a of the light shielding mask 33, but the uncut photographic light enters the photographic film 16. A region 48 into which the photographing light is incident (hereinafter, this region is referred to as a blur region) extends along the direction from the photographing region 18b toward the pre-exposure region 18a, in this example, along the short side of the photographing frame 18 ( It extends in the width H in the direction of the arrow A in the figure. Then, the amount of incident light gradually decreases in the direction indicated by the arrow A, that is, toward the pre-exposure area 18a.

As a result, the edge of the object image on the side of the pre-exposure area 18a is exposed in the blurred area 48. The edge of the object image is moved toward the pre-exposure area 18a. The photographic film 16 is exposed as a latent image whose density gradually decreases. That is, the edge of the subject image is exposed such that the density gradually increases toward the pre-exposure image area 18a on the print photograph.

The edge 33a of the light-shielding mask 33 is formed such that a blurred area 48 is formed at a position in the vicinity of the boundary 18c and straddling each of the areas 18a and 18b. The protrusion amount of the edge 33a of the light shielding mask 33 in the direction of the optical axis 5a is determined.

As a result, the pre-exposure image becomes
3, the subject image is exposed such that the edge of the pre-exposure image 18a is positioned within the blurred area 48 even if the position of the subject image is shifted along the direction of the arrow A. Black lines are prevented from appearing between the exposed image. Further, as described above, the edge of the subject image is gradually reduced in density to be superposed on the pre-exposure image so as to be exposed, and the pre-exposure image and the subject image are blurred by shading the image of the overlapped portion. The overlapping parts are not clarified. That is, a clear white line due to double exposure is prevented from appearing in the printed photograph. Further, by disposing the light-shielding mask 33 in this manner, the allowable range of the positional deviation of the pre-exposure image can be widened, and the manufacturing cost can be reduced.

It is preferable that the width H and the formation position of the blurred region 48, that is, the formation range substantially coincide with the shift range expected at the edge of the pre-exposure image. And the occurrence of white lines can be prevented.

Assuming that the focal length of the taking lens 5 is f (mm) and the aperture value of the aperture opening 44 is F, the width H (mm) of the blurred area 48 and the interval x (mm) are as follows. There is a relationship like an expression. When the diameter of the aperture 44 is D, the aperture F is given by D = f / F. (Fx): f / F = x: H ...

From the above equation, the following equation is obtained. From this equation, the distance x between the edge 33a of the light-shielding mask 33 and the front surface of the photo film corresponding to the width H of the blurred area 48 required.
Can be requested. x = Hf / (f / F + H)

The photographic film 16 has a width of 0.1 mm.
(± 0.05 mm) error is allowed. The film passage of the unit main body 3 is slightly wider than the width of the photo film 16. Further, as described above, the pre-exposure image may be misaligned during the pre-exposure. For this reason, the edge of the pre-exposure image is considered to be displaced by 0.1 mm or more in the width direction of the photographic film 16.
It is preferable that the thickness be 0.1 mm or more. On the other hand, when the width H of the blurred region 48 is increased, the area where the subject image and the pre-exposure image overlap with each other increases, or the area of the edge portion of the subject image which is not exposed to the pre-exposure image increases. May affect photo quality. For this reason, the width H of the blurred area 48 is set to
It is preferable to keep it on the order of 1.0 mm.

Therefore, it is preferable that the interval x satisfies the following conditional expression. In this example, the interval x also satisfies the conditional expression. 0.1 f / ((f / F) +0.1) ≦ x ≦ f / ((f / F) +1.0)

In this example, the entire light-shielding mask 33 is separated from the photo film 16, but only the edge 33a is separated from the photo film 16, and the other portions are almost adhered to the photo film 16. May be arranged. Of course, also in this case, it is needless to say that a part of the photographing light needs to be able to be incident near the boundary line 18c.

Next, the operation of the above configuration will be described. In the film cartridge 14 loaded in the lens-fitted film unit 2, a pre-exposure image is pre-exposed to each pre-exposure area 18a of the photographic film 16 at the time of manufacturing. The same pre-exposure image may be used for all the photographing frames 18 or a different image may be used for each photographing frame 18.

The pre-exposed photographic film 16 is
The main body 21 is loaded together with the cartridge shell 15. After this, a strobe unit 22,
The unit body 3 is completed by assembling the front cover 20 and the rear cover 24. After the inspection, the exterior paper 4 is attached to the unit body 3.
Is affixed to complete the film unit 2 with a lens. The completed lens-fitted film unit 2 is shipped and used for photographing under the user.

When taking a picture, first, the winding knob 13 is rotated to wind up the photographic film 16 by one frame.
A shutter charge is performed in conjunction with this winding.
Further, the photographer operates the strobe operating member 8 as necessary to select whether or not to emit strobe light. Next, after performing framing except for the finder 6 from the eyepiece side window 6b of the finder 6, the release button 9 is pressed. In the viewfinder 6, the photographing range exposed to the photographing area 18b can be observed.

When the release button 9 is pressed, the shutter blades 43 are swung by the shutter mechanism, and the shutter opening 40 is opened and closed. While the shutter opening 40 is open, the photographing light transmitted through the photographing lens 5 is emitted from the aperture opening 44 and enters the dark box 26 through the shutter opening 40.

Of the photographing light emitted from the aperture opening 44, the photographing light traveling toward the photographing area 18b
b, an exposure image is formed to form a latent image of the subject image. However, the photographing light traveling near the boundary 18c between the pre-exposure area 18a and the photographing area 18b is separated from the front surface of the photographic film 16 by the edge 33a of the light shielding mask 33. Because of the arrangement, a part of the part is cut by the edge 33a and the part of the light-shielding mask 33 in the vicinity thereof, and the remaining part that has not been cut reaches the photographic film 16 and is exposed. The exposure amount given at this time becomes smaller toward the pre-exposure area 18a. In the other pre-exposure area 18a to which the exposure is applied, that is, the pre-exposure area 18a which does not overlap with the blurred area 48, the exposure light is not applied because the photographic light directed to the area 18a is cut by the light shielding mask 33.

As a result, if the pre-exposure image is not misaligned, the edge of the subject image whose light amount has been reduced is located at the boundary 18c, ie, the pre-exposure area 18a and the photographing area 18c near the edge of the pre-exposure image. Exposure, a portion of which is exposed over a portion of the pre-exposed image. In addition, the blurred region 48 is formed in a range substantially coincident with the range of the positional deviation of the edge of the pre-exposed image, so that the pre-exposed image is displaced in the width direction of the photographic film 16. However, the edge of the subject image whose light quantity has been reduced is partially exposed to the pre-exposure image.

In this way, the photographing is performed for each photographing,
After the photographing of all the photographing frames is completed, the user rotates the winding knob 13 continuously to store all the photographic films 16 in the cartridge 15. Then, the lens-fitted film unit 2 is submitted to a developing laboratory.

At the developing station, the photographed film cartridge 14 is taken out from the film unit 2 with the lens.
The film developing process is performed while maintaining the correspondence between the cartridge shell 15 and the photographed photo film 16, and the developed photo film 16 is rolled into the original cartridge shell 15 again. At the time of the printing process, the printing on the photographic paper is performed in the same manner as in the related art while pulling out the photographic film 16 one by one from the cartridge shell 15. The print photograph thus obtained shows a composite image of the pre-exposure image and the subject image.

FIGS. 6 and 7 schematically show the recorded state of a printed photograph when the edge of the light-shielding mask is arranged almost in close contact with the photographic film and a positional shift occurs in the pre-exposure image. FIGS. 6B and 7B schematically show the density near the boundary between the subject image and the pre-exposure image on the printed photographs shown in FIGS. 6A and 7A. Is shown.

When the pre-exposure image is displaced so that the edge of the light-shielding mask enters the photographing area, a linear unexposed image is formed between the subject image exposed on the photographic film and the pre-exposure image. Part is left. Therefore,
As shown in FIGS. 6A and 6B, a black line 53 corresponding to an unexposed portion appears between the subject image 51 printed on the print photograph 50 and the pre-exposed image 52. The black line 53 has a very high density of black.

On the other hand, when the pre-exposure image is displaced so that the edge of the light-shielding mask enters the pre-exposure image, a part of the subject image is double-exposed on the photographic film to a part of the pre-exposure image. This double exposure portion is overexposed. For this reason, as shown in FIGS. 7A and 7B, in the print photograph 50, a clear white line 54 that appears white in a portion where the subject image 51 and the pre-exposure image 52 overlap each other appears.

As described above, conventionally, when a positional shift occurs, a black line 53 having a high density and a clear white line 54 are printed on a printed photograph, and these conspicuously deteriorate the quality of the printed photograph. However, such a black line 53 or a white line 54 does not appear in a print photograph created from the photographic film 16 photographed by the film unit with lens 2 according to the present invention.

FIG. 8 schematically shows a recording state of a print photograph created from a photograph film 16 photographed by the film unit with lens 2 embodying the present invention. FIG. 8B schematically shows the density near the boundary between the subject image and the pre-exposure image on the print photograph shown in FIG. 8A.

The blurred area 48 is printed in an area 56 on the print photograph 50 indicated by hatching in FIG. Even if the edge of the pre-exposure image on the photographic film 16 is misaligned with respect to the edge 33a of the light-shielding mask 33, the edge of the subject image on the photographic film 16 is reduced by the photographic light gradually reduced toward the pre-exposure area 18a. Bokeh area 48
And a part of the pre-exposure image is exposed so as to overlap with a part of the pre-exposure image, so that an image in which a part of the pre-exposure image 52 and a part of the edge of the subject image 51 overlap is printed. become. That is, even if the pre-exposure image is displaced, no unexposed portion is formed between the subject image and the pre-exposure image on the photographic film 16.
As shown in (b), the black line does not appear between the subject image 51 and the pre-exposure image 52 on the print photograph 50.

In the area 56, the pre-exposure image 52
Boundary position 57 corresponding to the position of the edge on the subject image side
Only the edge of the subject image 51 is printed above, and the edge of the subject image 51 and the pre-exposure image 52 are printed below.
Are in a state in which the double-exposed image is printed.
In the portion where only the edge of the subject image 51 is printed, the density of the image gradually increases in the direction toward the lower part of the printed photograph 50.

In the portion where the double-exposed image is printed, the edge of the subject image whose exposure amount is gradually reduced toward the upper side of the photographing frame 18 on the photographic film 16 and the pre-exposed image are double-exposed. Corresponding to the part that is being done. Therefore, the original density of the pre-exposure image in the direction from the density lower by the pre-exposure image than the density near the boundary position 57 of the portion where only the edge is printed toward the lower part of the print photograph 50 is reduced. It is gradually increasing until. in this way,
Since the edge portion of the subject image 51 is exposed with the exposure amount gradually reduced, the double-exposed image portion is printed in a state where the density is gradually increased and the density is blurred. The part appears as a clear white line as described above and does not stand out.

As a result, it is possible to obtain a high-quality print photograph in which the pre-exposure image and the subject image are combined in a favorable state without black lines or clear white lines.

In the above embodiment, an example was described in which the pre-exposure image was pre-exposed on the top of the photographic film. However, the present invention applies the pre-exposure image to other places, for example, the lower, left, right, and surrounding areas of the photographed frame. It can also be used for exposure. Of course, various shapes can be adopted for the shape of the pre-exposure image.

[0058]

As described above, according to the present invention,
The focal length of the taking lens is f (mm), the aperture value is F, and the distance in the optical axis direction between the taking light limiting edge of the light-shielding mask that covers the pre-exposed area where the pre-exposed image has been pre-exposed and the front of the photo film. When x (mm), 0.1 f / ((f / F) +0.1) ≦ x ≦ f / ((f / F)
+1.0) so that the edge of the light-shielding mask is separated from the front of the photo film, so that even if there is a misalignment between the edge of the light-shielding mask and the edge of the pre-exposed part, the shading will be blurred. The exposed portion of the subject image overlaps the edge of the pre-exposed image and is exposed, so that an unexposed portion occurs between the pre-exposed image and the subject image, causing a black line to appear in the printed photograph, A clear white line due to the exposure of the subject and the subject image overlapping does not appear. Further, the allowable range of the positional deviation of the edge of the pre-exposure image with respect to the edge of the light shielding mask can be widened.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing an enlarged main part of a light-shielding mask.

FIG. 2 is a perspective view showing the appearance of a film unit with a lens embodying the present invention.

FIG. 3 is an explanatory view showing a film cartridge.

FIG. 4 is an exploded perspective view showing the configuration of a film unit with a lens.

FIG. 5 is a cross-sectional view showing a cross section of a main part of the unit main body.

FIG. 6 is an explanatory diagram showing a recording state of a print photograph in which a black line appears.

FIG. 7 is an explanatory diagram showing a recording state of a print photograph in which a white line appears.

FIG. 8 is an explanatory diagram showing a recording state of a print photograph obtained from the film unit with a lens of the present invention.

[Explanation of symbols]

 2 Film unit with lens 3 Unit body 5 Photo lens 16 Photo film 18 Photo frame 18a Pre-exposure area 18b Photo area 33 Light shielding mask 33a Edge 48 Blur area

Claims (1)

[Claims] 1. A photographing frame is divided into a photographing area and a pre-exposure area, a pre-exposure area is loaded with a photographic film on which a pre-exposure image has been previously exposed, and the pre-exposure is performed by a light-shielding mask provided on a front surface of the photographic film. In a film unit with a lens that synthesizes a subject image and a pre-exposure image in a shooting frame by shooting while covering the area, when the focal length of the shooting lens is f (mm) and the aperture value is F, The distance x (mm) in the optical axis direction between the photographing light limiting edge of the light-shielding mask and the front side of the photo film is set to 0.1 f / ((f / F) +0.1) ≦ x ≦ f / ((f / F )
+1.0) A film unit with lens.