JPH09258378A - Photographic film patrone - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a photographic film patrone contrived so that light reflected on the inside surface of a gap between a cover member and a film path is prevented from arriving at the inside of a cartridge main body when the cover member is closed. SOLUTION: This patrone is constituted so as to obtain the relation of A×B <=almost 15% when the reflectivity of the light made incident on by the angle of 75 deg. in the normal reflecting direction of 75 deg. is A% on the surface of a cover part 15 and B% on the surfaces of the inside walls 3a and 4a of the film path 14 by roughening one of the parts of the cover member 15 and the path 14 shown by oblique lines. Thus, even in the case that an exposure action is executed by the high-illuminance light in a long time when a light shielding cover 12 is closed, external light is prevented from arriving at the inside of a cartridge main body.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photographic film cartridge of a type which feeds a photographic film by rotating a spool, and more particularly to a photographic film cartridge having a light-shielding lid member in a film passage.

[0002]

2. Description of the Related Art Recently, a photo film patrone of the type in which a photo film is provided up to the tip of the film inside the patrone and the photo film is sent to the outside of the patrone through a film passage by rotating a spool in the film feeding direction is known. Are known. In this photo film patrone, a light shielding lid which is rotatable between an open position and a closed position of the film passage is provided in place of the telemp.

As shown in FIG. 3, the light shielding lid 34 includes a lid portion 36 for opening and closing the film passage 35, and a pair of shaft portions 38 provided on both sides of the lid portion 36 so as to be operable from the outside of the side surface of the cartridge body 37. Since the opening work is performed in a dark room such as a camera, the inside of the cartridge main body 37 is shielded from light only at the closed position. In the closed position at this time, the upper side of the lid portion 36 is in contact with the inner wall of the film passage 35 to prevent further rotation, and the lower side of the lid portion is in contact with the inner wall of the film passage 35. Alternatively, by making them close to each other, the inside of the cartridge main body 37 is shielded from light.

[0004]

By the way, the light-shielding lid 34 is used.
Even when it is in the closed position, if it is exposed to strong external light for a long time, such as sunlight under the hot sun in summer, the external light may enter the inside of the Patrone body 37. This is because the lid 36 and the inner wall of the film passage 35 that comes into contact with the lid 36 have an uneven shape, and the outside light that has entered is internally reflected by the surfaces of the lid 36 and the inner wall of the film passage 35 that comes into contact therewith. Although it is scattered by the light source, the scattered light reaches the inside of the Patrone body 37 when it is exposed to the high-intensity light as described above for a long time. As a result of the experiment, the photo film is fogged. Was there.

The present invention has been made in order to eliminate such an adverse effect, and light entering the gap between the lid member and the film passage when the lid member is in the closed position enters the inside of the cartridge 37. The purpose is to provide a photographic film cartridge that is designed so as not to reach the destination.

[0006]

In order to achieve the above-mentioned object, a photographic film patrone for delivering a photographic film to the outside of a patrone main body through a film passage by rotating a spool in a film delivering direction,
The film passage is provided with a lid member that is rotatable between a closed position that closes it and an open position that opens, and by rotating the lid member to the closed position, outside light passes through the film passage, In the photo film patrone, which is designed to prevent it from reaching the inside of the cartridge, the reflectance of light incident at an angle of 75 degrees in the specular direction of 75 degrees is A% on the surface of the lid member, and the inner wall surface of the film passage. In the case of B%, A × B is approximately 15% or less. It is also preferable that at least one of the inner wall surface of the film passage of the photographic film cartridge and the surface of the light shielding lid is roughened.

When the reflectance of the light incident at an angle of 75 degrees in the regular reflection direction of 75 degrees is A% on the surface of the lid member and B% on the inner wall surface of the film passage, A × B is approximately 15%. By the following, it is possible to prevent outside light that internally reflects the surface of the lid member and the inner wall surface of the film passage from reaching the inside of the cartridge body. Further, by roughening at least one of the inner wall surface of the film passage and the surface of the light shielding lid,
It achieves the above-mentioned values.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 3 is an exploded perspective view of a photographic film cartridge in which a photographic film is fed by rotating a spool. Photo film Patrone 2
Upper case 3 and lower case 4 constituting the Patrone body 7
And a photo film 6 which is rotatably incorporated therein and a photo film 6 which is wound around the spool 5 by locking the film rear end 6a. Each part except the photo film 6 is made of a plastic material. Made of molded products.

A pair of disks 9a and 9b are fixed to the spool 5 such that their outer peripheral edges are bent in a direction in which they face each other, and at this bent portion, the outermost periphery of the photographic film 6 wound on the spool 5 is suppressed to prevent winding looseness. To do. At one end of the spool 5, a locking tooth 1 that acts as a rotation stopper for the spool 5 is provided.
0a and the disk 9b are engaged from the outside, and the locking claw 10b rotates the disk 9b in the same direction only when the spool 5 rotates in the film feeding direction (clockwise direction in the drawing).
The retaining ring 10 with is fixed. A barcode label 11 on which shooting information and the like are recorded is attached to the other end.

A light shielding lid 12 and a lock lever 13 are incorporated in the lower case 4. This photo film patrone 2
Has a function of preventing outside light from entering the inside of the cartridge body 7 when the unexposed photographic film 6 is stored in the cartridge body 7. This is performed by rotating the light shielding lid 12. . The light shielding lid 12 is rotatably incorporated in a film passage 14 formed at a joint when the upper and lower cases 3 and 4 are combined. The light-shielding lid 12 has shafts 16 and 16 formed on both sides of the lid 15 and is exposed from both side surfaces of the cartridge body 7. A drive shaft for opening and closing the lid member engages with a key groove provided in one of the shaft portions 16 and 16 when loaded in a camera or the like. By this rotation of the drive member, the closed position for closing the film passage 14 shown by the solid line in FIG. 1 and the film passage 14 shown by the dashed line in FIG.
Is rotated to and from the open position to open.

The lock lever 13 engages with the locking tooth 10a when the light-shielding lid 12 is in the closed position to prohibit the rotation of the spool 5, and releases the lock when the light-shielding lid 12 is rotated to the open position. Enables the spool 5 to rotate. Reference numeral 17 is a label sticker on which the type of the photographic film 6 and the number of photographable images are printed, which is attached after the upper and lower cases 3 and 4 are combined.

In FIG. 1, which shows the main part of the present invention, a lid 1
As shown in the figure, a rotation restricting portion 15a is formed on the upper portion of the member 5 to abut against the inner wall 3a on the upper side of the film passage 14 and prevent rotation in the closing direction at the closed position. The rotation restricting portion 15a has a hook shape, and the inner wall 3a of the film passage 14 on the opposite side also has a hook shape. By engaging these, the light shielding property in the upper portion of the film passage 14 is improved, and the rotation in the closing direction is prevented.

At the lower portion of the lid portion 15, when the light-shielding lid 12 is in the closed position, the open side faces the direction in which the outside light is incident on the portion contacting or approaching the inner wall 4a below the film passage 14. The notch 15b is formed in a step shape. The inner wall 4a of the film passage 14 is formed in a stepped shape corresponding to each of the cutout portions 15b, and the two are engaged at the closed position to improve the light-shielding property in the lower portion of the film passage 14. .

When the light-shielding lid 12 is in the closed position, outside light enters through a gap formed between the lid portion 15 and the inner walls 3a and 4a of the film passage 14 which abuts on the lid portion 15. The inner walls 3a and 4a of the film passage 14 that come into contact with the lid portion 15 have irregular shapes, and external light is internally reflected and scattered / absorbed by the surfaces of the lid portion 15 and the inner walls 3a and 4a a plurality of times. However, when exposed to light of high illuminance for a long time, the scattered light in the gap easily reaches the inside of the cartridge main body 7 and fog is easily generated on the photographic film 6.

Therefore, a light-shielding lid 12 and a film passage 1 are formed by using a molding die that has been matted as described below.
In the upper and lower cases 3 and 4 which form part 4, a rough surface for reducing the reflectance of external light is formed in the hatched portion shown in the figure, and as shown in Table 2, a conventional light-shielding lid having no rough surface is formed. Samples 1 to 4 in which upper and lower cases 3 and 4 having rough surfaces are combined,
Sample 5 in which a light-shielding lid 12 having a rough surface and a conventional upper and lower case having no rough surface are combined, and samples 6 and 7 in which upper and lower cases 3 and 4 having a rough surface and a light-shielding lid 12 are combined A light-shielding test was performed to prepare and compare and examine these samples 1 to 7. As a reference, a similar test was performed using a conventional photographic film cartridge as Sample 8. The procedure up to the light-shielding test will be described below.

The parts of the photographic film cartridges of Samples 1 to 7 are produced by a molding die in which the surface forming the rough surface of the parts is matted as described above. In order to create a rough surface on the molding die, the following four kinds of methods A to D are used. A: The surface on which the rough surface is to be created is lightly polished with sandpaper No. 1000. Here, a fine scratch is made to form a matte surface. B: Blow sand blast on the surface to create the rough surface,
Form a matte surface. The sandblasting process is performed under the following conditions. Air pressure = 5.5 kg / cm ² , spray nozzle diameter = φ1.0 mm, spray distance = 7 cm, spray time = 2 minutes. As the spraying material, No. 100 white alumina fine powder (WA) manufactured by Toyo Abrasive Industry Co., Ltd. is used. C: A matte surface according to S-2, which is a matte sample by an electric discharge machine manufactured by Sodick Co., Ltd., is formed on the surface on which the rough surface is created. D: A matte surface conforming to Matte Sample: HN-1005 or HN-1015 of Nippon Etching Co., Ltd. is formed on the surface on which the rough surface is created.

Next, with respect to the rough surface formed by the molding die having the matte surface formed by the above-mentioned methods A to D, the incident angle θ _{1 was} measured by using a reflection gloss meter manufactured by Murakami Color Research Laboratory. = 75 °, light receiving angle θ ₂ = 75 °, JIS Z 87
The reflection glossiness was measured according to the 75-degree specular glossiness measurement method of No. 41. The measurement results are as shown in Table 1. In addition, D ₁ and D ₂ are respectively the above-mentioned HN-100
5, the results for HN-1015 are shown.

[0018]

[Table 1]

The breakdown of the components of the plastic material used in each part is that the majority is composed of polystyrene resin, and fannes carbon black is 0.1 to 3%,
A lubricant is added in an amount of 0.5 to 3% and a rubber component is added in an amount of 3 to 10%.

The light-shielding test was carried out on samples 1 to 8 shown in Table 2.
1 so that the light-shielding lid 12 side faces the light source.
It was exposed to light of 50,000 lux for 2 hours. Development, fixing, washing with water, drying, and visual observation of the fog on the photographic film, a four-level evaluation was conducted, and the evaluation results are shown in Table 2. In addition, a color film “Fuji Color Ace 400” (trade name) having an ISO sensitivity of 400 was processed and used for each sample.

[0021]

[Table 2] [Judgment of Fog] A: Excellent. ：: Excellent. Δ: Fogging occurs although it is not a problem. X: Problem ant. Need improvement.

The results obtained in Table 2 will be described below. First, since the sample 8 does not use the roughened parts, the value of "product of reflection glossiness" is 0.26, which is larger than the others,
Naturally, it is not possible. Sample 1 and sample 5 are
The degree of “judgment result of light-shielding test” is “△” and “○”, respectively.
Both are ineligible for implementation because they are ~.
Samples 2 to 4, sample 6 and sample 7 excluding these have good results and can be implemented.

"Judgment result of light-shielding test" for samples 1 to 8
And the value of "product of reflection glossiness" correlate very well. From “Judgment result of light-shielding test” of sample 5,
It can be seen that the value of "product of reflective glossiness" at the boundary between feasible "○" and "△" causing fogging is 0.16, so the value of "product of reflective glossiness" is almost If it is 0.15 or less, the fog problem can be solved. Therefore, in addition to the combinations described above, it is feasible if the value of "product of reflection glossiness" is approximately 0.15 or less.

[0024]

As described above, the photographic film cartridge which feeds the photographic film out of the main body of the film cartridge through the film passage by rotating the spool in the film feeding direction, and the film passage is closed at the closed position. And a lid member rotatable between an open position and an open position. By rotating the lid member to the closed position, external light is prevented from passing through the film passage and into the cartridge body. In the photographic film cartridge, the light incident at 75
When the reflectance in the regular reflection direction is A% on the surface of the lid member and B% on the inner wall surface of the film passage, A × B is about 15%.
By the following, it is possible to prevent outside light that internally reflects the surface of the lid member and the inner wall surface of the film passage from reaching the inside of the cartridge body.

[Brief description of drawings]

FIG. 1 is a side view of a main part of a photographic film patone of the present invention.

FIG. 2 is an exploded perspective view showing a photographic film cartridge of the present invention.

FIG. 3 is a side view of a main part of a conventional photographic film cartridge.

[Explanation of symbols]

 2 Photo film Patrone 3 Upper case 4 Lower case 5 Spool 6 Photo film 7 Patrone body 12 Light-shielding lid 14 Film passage

Claims (2)

[Claims] 1. A photographic film cartridge for feeding a photographic film out of a cartridge main body through a film passage by rotating a spool in a film feeding direction, wherein the film passage has a closed position and an open position for opening the film passage. And a lid member that is rotatable between the lid member and the lid member. By rotating the lid member to the closed position, external light is prevented from passing through the film passage and reaching the inside of the Patrone body. In the film cartridge, when the reflectance of light incident at an angle of 75 degrees in the regular reflection direction of 75 degrees is A% on the surface of the lid member and B% on the inner wall surface of the film passage, A × B is omitted. A photographic film patrone characterized by being 15% or less. 2. The photographic film cartridge according to claim 1, wherein at least one of the inner wall surface of the film passage and the surface of the light shielding lid is roughened.