JPH10319545A - Brownie film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a bar code from being erroneously read by preventing a joining tape used as the recording surface of the bar code from being extremely recessed and being made to a slope. SOLUTION: One end of a joining tape 7 is stuck to a film strip 4 and the other end is stuck to light shielding paper 3. Then, the tip of the strip 4 is fixed to the paper 3. Synthetic paper whose a base material is polystyrene, polyethylene terephthalate or the like is used for the joining tape 7 and the stiffness thereof is set within a range of 80-150 mgf by Gurley stiffness. When a Brownie film is left by being wound round a spool, the surface thereof is not extremely deformed and the level difference 7a thereof becomes a gentle slope because the joining tape 7 has the proper stiffness. In the case that the bar code recorded on the surface of the joining tape 7 is read by a photosensor 5 based on diffused reflection light, it can be conveniently read even when the bar code is recorded at the level difference 7a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a brownie film in which a light-shielding paper is combined with a film strip.

[0002]

2. Description of the Related Art Brownie films have a size of 12% depending on the type of light-shielding paper used together with the film strip.
There are two types, 0 and 220. 120 types
A light-shielding paper is used as a backing portion over the entire film strip, and a leader portion and a trailer portion are further provided at both ends of the backing portion.
These leader section and trailer section are wound so as to cover the outer peripheral side when the film strip is wound around the spool together with the light shielding paper after unused or after use,
The film strip is protected from external light. In the 220 type, the backing portion of the 120 type is omitted, and light-shielding paper corresponding to the above-described leader and trailer portions is bonded to the leading end and the trailing end of the filmstrip, respectively. .

[0003] These brownie films include, in addition to the 120 and 220 film types described above, monochrome and monochromatic films.
Color negative, reversal type, ISO sensitivity, and 1
For the 20 types, various types are prepared, such as a standard length and a half size of half the length. When a film is loaded in the camera, the position of the pressure plate and the film counter are switched according to the type and type of the film, and the ISO sensitivity is set.

In order to simplify or automate the setting operation of a camera using such a brownie film,
It is known from Japanese Patent Application Laid-Open No. 9-80695 or the like to record a bar code indicating a film type or type on the surface of a bonding tape in which the leading end of a film strip is attached to a light-shielding paper. This bar code is formed by alternately arranging thick / narrow white bars / black bars along the film feeding direction. After loading the film, the first frame is fed to the back of the exposure frame. During the period of transport, it is read by a reflective photosensor built into the camera.

A bar code is read by monitoring a change in a photoelectric signal output obtained from a photo sensor. First, it is necessary to accurately discriminate a white bar from a black bar based on the intensity of light reflected from each bar. Becomes In this case, if the surface of the joining tape is a glossy surface, the specular reflected light component becomes strong, and considerable reflected light from both the white bar and the black bar enters the light receiving portion of the photo sensor. It becomes difficult to do. For these reasons, the surface of the bonding tape can be made non-glossy (rough),
A device has been devised such that a light receiving optical axis is tilted to read a bar code using diffuse reflection light.

[0006]

However, the surface of the bonding tape serving as the barcode recording surface has extreme irregularities and inclined surfaces, and the light irradiated from the light projecting portion of the photosensor is greatly inclined and reflected. In some cases, it is difficult to receive the diffused reflected light by the photosensor light receiving unit, and it is found that a barcode reading error is likely to occur.

FIG. 6 shows a cross section of a bonding tape portion of a conventional brownie film. The joining tape 2 has one end attached to the light-shielding paper 3 and the other end attached to the film strip 4. Therefore, a step due to the thickness of the film strip 4 (about 100 to 120 μm) occurs at the leading edge 4 a of the film strip 4. In particular, triacetyl cellulose (TAC) or polyethylene terephthalate (PET) is often used as the base material of the film strip 4, but these base materials have a strong curl behavior when wound around a spool. It is known that is easy to come out. In addition, the curling behavior causes the leading edge 4a to have a tendency to rise from the light-shielding paper 3, and furthermore, the conventional joining tape 2 is made of paper having poor rigidity. The bonding tape 2 has an extreme step 2a
Easy to do.

In this state, the reflection type photosensor 5
Irradiating light from the light projecting portion 5a and receiving light reflected from the bonding tape 2 by the light receiving portion 5b, it can be said that the light is diffusely reflected at the stepped portion 2a, and most of the light is in the direction away from the light receiving portion 5b On the other hand, a large decrease in the amount of received light is inevitable. The solid line shown in FIG. 7 represents a photoelectric signal output obtained from the surface of the bonding tape 2 itself when no barcode is recorded, and the step 2a moves onto the photosensor 5 by film feeding. Then, the photoelectric signal output greatly decreases.

Therefore, when a bar code is recorded on the joining tape 2 and a white bar is located on the step 2a,
The diffuse reflection light from the white bar cannot be sufficiently received by the light receiving portion 5b, and the photoelectric signal output cannot rise to the original high level as shown by the broken line in FIG. Therefore, when the white bar / black bar is to be determined by comparing the photoelectric signal output with the threshold value Sv, the white bar is erroneously read as a black bar, or the wide white bar is erroneously read as a narrow white bar. There is a risk. Also, if the inclination of the stepped portion 2a is large, the length in the film feeding direction as viewed from the photosensor 5 is short, so that a thick bar with a narrow width is used for either a white bar or a black bar. It may lead to a situation where the width is misread or the narrow width cannot be detected.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is intended to prevent an extreme unevenness or an inclined surface from being formed on a joining tape which is pasted on a light-shielding paper at the leading end of a film strip, and recorded on the surface. An object of the present invention is to provide a brownie film in which a barcode is not misread.

[0011]

In order to achieve the above object, the present invention sets the Gurley stiffness, which represents the rigidity of the bonding tape, in the range of 80 to 150 mgf, has a higher rigidity than the conventional bonding tape, and has extreme irregularities. This prevents the brownie film from being generated, and allows the bending of the brownie film to be easily performed without a large resistance when wound around the spool. Furthermore, the use of polyethylene naphthalate (PEN) as the base material of the film strip makes it difficult for the film strip to have curl behavior, and also makes it difficult for the bonding tape to have extremely unevenness and inclination.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a 120-type brownie film using the present invention. Film strip 4
Is wound around the spool 6 in combination with the light-shielding paper 3. The light-shielding paper 3 includes a backing paper portion 3a covering the back surface of the film strip 4 over the entire length thereof, and a leader portion 3b further extended to the leading end side of the film strip 4.
And a trailer portion extended to the spool 6 side. The surface of the joining tape 7 that affixes the leading end of the film strip 4 to the light-shielding paper 3 is used as a recording surface of the barcode 8.

As shown in FIG. 2, for example, as shown in FIG. 2, two types of black bars of a wide width / narrow width are recorded on the surface of the joining tape 7 at two types of intervals of a wide width / a narrow width. The white background portion of the joining tape 2 becomes a white bar. In addition,
The expression of the white bar and the black bar is used to mean that the bar can be detected as a high reflection bar or a low reflection bar based on a photoelectric signal from a reflection type photosensor, and necessarily means only a white bar or a black bar. It does not do.

In the case of the bar code shown in FIG. 2, quiet zones 9a and 9b having predetermined widths are respectively provided on the front end side and the rear end side of the joining tape 7, and the first black bar (narrow width) to the last black bar (narrow width) are provided. Seven black bars up to (thick width) and six white bars between them constitute a 13-bit code array. The three bits (1) to (3) represent the difference between a 120/220 film and the two types of length (normal size / half size) in the case of a 120 film, and (4) to (1)
3) 10 bits indicate monochrome / color, negative / positive, and ISO sensitivity.

While the bonding tape 7 is moved by the film feeding, the change of the photoelectric signal obtained from the reflection type photo sensor is monitored, and the boundary between the white bar and the black bar is identified one after another. A wide / narrow array composed of bars is detected. By assigning the wide width / narrow width to “1” and “0” respectively, an array of binary codes “0” and “1” is read. The binary code array obtained in this way is stored in a table ROM built in the camera.
By collating with the above data, it is possible to decrypt the various film information described above.

The bonding tape 7 is made of, for example, polystyrene (P
S) or synthetic paper based on polyethylene terephthalate (PET), and the Gurley stiffness representing the degree of rigidity is in the range of 80 to 150 mgf.
Gurley stiffness is described in "J. TAPPI Paper and Pulp Test Method N"
o. The value obtained by the measurement by the Gurley method specified in “40”, the force is applied to the free end of a vertically held test specimen, and the bending moment that occurs when the test specimen is bent at a constant speed is calculated in mgf. It is a thing. The Gurley stiffness of 80 to 150 mgf is larger than the Gurley stiffness of the bonding tape of a conventional brownie film of 30 to 60 mgf.

The joining tape 7 is used for attaching the light-shielding paper 3 and the film strip 4 as shown in FIG. 3, and at the time of this attachment, an appropriate tension is applied to the joining tape 7 from the left and right directions. . Therefore, the step 7a formed by the leading edge 4a of the film strip 4 has a gentle slope.

The bonding tape 7 thus adhered has an appropriate rigidity even if it is wound around the spool 6 together with the light-shielding paper 3 and the film strip 4 at a radius of curvature of about 10 mm. No deformation. Therefore, when the bonding tape 7 is moved above the photosensor 5 by the initial feeding after being loaded into the camera, the step 7a is restored to a gentle inclination as shown in FIG.

In this state, the bar code is read by the photo sensor 5 based on the diffuse reflected light,
Looking at the photoelectric signal from, even if the white bar is located at the step 7a, the photoelectric signal output does not decrease extremely as indicated by the broken line in FIG.
The white bar / black bar can be reliably identified. Note that the waveform shown by the solid line in FIG. 5 is obtained when the surface of the bonding tape 7 itself on which the barcode is not recorded is read by the photosensor 5, and the output of the photoelectric signal does not extremely decrease due to the step 7a from this waveform. Can be confirmed.

FIG. 5 schematically shows the degree of curl habit remaining on the joining tape 7 when the brownie film using the joining tape 7 is wound around the spool 6 (having a diameter of the winding shaft of about 12 mm) and allowed to stand. . The curl habit with a radius of curvature of less than 40 mm remains when it is unwrapped immediately after being wound, whereas the curl habit with a radius of a little over 10 mm is expected to remain when left for 3 years or more. When the film is fed, the film is corrected into a flat shape by the film pressure plate, so that there is almost no effect on reading the bar code. In addition, the data for more than 3 years when left unattended is based on the temperature of 60 ° which is almost the same condition.
C, Data obtained by leaving the apparatus under an environment of 60% humidity for 2 days.

As described above, according to the present invention, since the bonding tape 7 has an appropriate rigidity, even if the brownie film is left wound on the spool 6 for a long time, the bonding tape 7 may have extremely unevenness. Even if the joining tape 7 is used as a barcode recording surface, a barcode can be detected without error. Further, when polyethylene naphthalate is used as the base material of the film strip 4 instead of the conventional TAC or PET, the curl behavior of the film strip 4 itself is less likely to occur. This is advantageous. Of course, the present invention can be applied not only to a 120 type but also to a 220 type brownie film.

[0022]

As described above, in the brownie film of the present invention, the rigidity of the bonding tape, which is applied to the light-shielding paper at the tip of the film strip, is increased by a Gurley stiffness of 8%.
Since it is 0 to 150 mgf and is more rigid than the conventional bonding tape, even when the brownie film is left wound around the spool, no extreme unevenness or inclined surface is formed on the bonding tape surface. Therefore, when a barcode is recorded on the surface of the joining tape and is read by a reflection type photosensor, reading error hardly occurs. As a result, various types of film information can be reliably and automatically input to the camera using the barcode.

[Brief description of the drawings]

FIG. 1 is an external view of a brownie film using the present invention.

FIG. 2 is an explanatory diagram of a bar code.

FIG. 3 is a sectional view of an essential part of a brownie film using the present invention.

4 is a schematic waveform diagram of a photoelectric signal output obtained from the bonding tape shown in FIG.

FIG. 5 is an explanatory diagram showing a tendency of curl habit remaining in the bonding tape of the brownie film of the present invention.

FIG. 6 is a sectional view of a main part of a conventional brownie film.

7 is a schematic waveform diagram of a photoelectric signal output obtained from the bonding tape shown in FIG.

[Explanation of symbols]

 2,7 joining tape 3 light shielding paper 4 film strip 6 spool 8 barcode

Claims (2)

[Claims] A barney is recorded on a surface of a sheet-like joining tape in which the leading end of a film strip is stuck to a light-shielding paper, and is used by being wound around a spool and loaded into a camera for use. The bonding tape has a Gurley stiffness in the range of 80 to 150 mgf. 2. The brownie film according to claim 1, wherein polyethylene naphthalate is used as a base material of the film strip.