JPS6130255B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a film cartridge for use in a still camera that uses synthetic resin instead of a conventional metal film cartridge and has an easily molded structure.

A conventional metal film cassette has a thin metal plate pressed into a cylindrical body, tongues are provided at both ends of the cylindrical body, and the pair of tongues form a film outlet guide opening. Circular metal caps with spool play holes are fitted to both axial ends of the cylindrical body to hold it in a cylindrical shape.
The structure is such that the spool fitted into the spool fitting hole is light-tight. The roll of photographic film wound around the spool is pulled out from the film outlet guide port.

In contrast to this metal film cartridge, a film cartridge using synthetic resin has been proposed, which has the same function but from the standpoint of mass production. For example, US Patent No. 3104846 and US Patent No. 3128058
There are numbers etc. Also in Japan, Jikko Sho 36-24752
The proposal has been disclosed in Japanese Patent Application Laid-open No. 50-33831 and the like. These are all different from metal film cartridges not only in material but also in structure.We studied the characteristics of the synthetic resin and the shape of the resin formed by the mold, and furthermore, we developed two resin parts.
In the case of splitting, many methods have been proposed for combining them. Most of them are constructed of a semi-cylindrical member divided into two parts in the axial direction, but none of them have been satisfactorily treated at both ends in the axial direction. In other words, in all of these proposals, the spool engagement hole on the axial end face of the cylinder is divided into two, and a semicircular spool engagement hole is provided in the semi-cylindrical member that has been divided into two. At first glance, the film cassette is divided into two parts in the axial direction, but considering light leakage at the joint, the structure of the semi-cylindrical member is complicated, the precision of the spool engagement hole is deteriorated, and the axial end face is There was a risk of light leakage.

The purpose of this invention is to solve the above-mentioned drawbacks.The purpose of this invention is to provide a semi-cylindrical member that is divided into two parts in the axial direction, and has an engaging part at one end of the side wall and a film guide tongue piece at the other end. and a semi-cylindrical member A having a side plate 5 with a film spool fitting hole bored in one end face of the side wall, an engaging portion at one end of the side wall, and the film lead-out guide tongue piece at the other end. A side plate 10 is provided, in which film outlet guide tongues forming film outlet guide openings are respectively formed, and a film spool engagement hole is bored in one end surface of the side wall to form a film spool receptacle together with the film spool engagement hole. The semi-cylindrical member A and the semi-cylindrical member B each have grooves that fit into the convex portion of the flange of the film spool at the portions of the inner circumference of each side plate that contact the side walls. This is achieved by a film cartridge made of synthetic resin that is fixedly held together with the joint portion of member B by engaging with it so as to maintain light-shielding properties.

That is, in this invention, a semi-cylindrical member divided into two parts in the axial direction is provided with an end face portion in which a film spool engagement hole is bored, and this invention improves the precision of the spool engagement hole, and Eliminates the risk of light leakage from the axial end face, and since the convex part on the outer edge of the spool's collar fits into the groove on the side plate, there is no need to worry about light leakage from the play hole. play.

Hereinafter, one embodiment of the present invention will be described in detail based on the drawings.

In FIG. 1, reference numeral 1 has a fitting groove 2 formed as an engaging part at one end of a side wall having a U-shaped cross section, and a film lead-out guide tongue 3 at the other end, and one end of the U-shaped side wall. It is a semi-cylindrical member A which can also be called a main body of a film storage chamber made of synthetic resin and has a side plate 5 with a film spool coupling hole 4 formed therein.

Reference numeral 6 has a fitting protrusion 7 (see Fig. 2) which is an engaging portion that engages with the fitting groove 2 at one end of the upper wall having an arcuate cross-section, and a film outlet guide opening together with the film outlet guide tongue 3 at the other end. A half-body, also called a lid of a film storage chamber, is made of synthetic resin and has a side plate 10 formed with film lead-out guide tongues 8 and a film spool engagement hole 9 formed at one end of the upper wall. This is a cylindrical member B.

11 is a spool with a pair of flanges 13, 13
Furthermore, circumferential protrusions 14, 14 (the circumferential protrusions 14 of one flange 13 is not shown) are formed on the outer surfaces of the tips of the flanges 13, 13.

The spool 11 is loaded into the semi-cylindrical member A1, and the shaft end 12 of the spool 11 is loosely engaged with the film spool engagement hole 4 of the semi-cylindrical member A1, and the semi-cylindrical member B2 is engaged with the semi-cylindrical member A1. The shaft end 1 of the spool 11 is inserted into the film spool coupling hole 9 of the cylindrical member B6.
2 are loosely engaged with each other, and the spool 11 is loosely rotated within a film storage chamber formed by the semi-cylindrical member A1 and the semi-cylindrical member B6.

Note that a circumferential groove 15 is formed inside the side plate 5 of the semi-cylindrical member A1. Also, the side plate 10 of the semi-cylindrical member B6
A circumferential groove 15 is also formed inside (the circumferential groove 15 is not shown). Further, a light-shielding material 16 such as a telescope is provided on the upper surface of the film lead-out guide tongue piece 3 of the semi-cylindrical member A1.
Paste. Further, a light shielding material 16 is attached to the lower surface of the lead-out guide tongue piece 8 of the semi-cylindrical member B6 (the light shielding material 16 is not shown).

First, a partially exposed film (not shown) is wound around the spool 11 in, for example, a dark room. Then, the spool 11 wound with the film is loaded onto the semi-cylindrical member B1. At this time, the shaft end 12 is inserted into the film spool fitting hole 4 so that the leading end of the film rests on the light shielding material 16. Note that the spool 11 may be loaded into the semi-cylindrical member A1 and the film may be wound thereon. Next, the fitting protrusion 7, which is the engaging part of the semi-cylindrical member B6, is inserted into the fitting groove 2, which is the engaging part of the semi-cylindrical member A1, and the semi-cylindrical member A1 and the semi-cylindrical member B6 are fitted together. do. Then, by welding using ultrasonic waves or the like, the two become integrated. Note that the film spool coupling holes 4 and 9 and the shaft end 1 of the spool 11 inserted into the holes
Light leakage from the gap between the flanges 13 and 12
13 and the circumferential grooves 15, 15 of the side plates 5, 10 (see FIG. 3). The film lead-out slit of the cartridge is shielded from light by light shielding materials 16, 16 such as telemp. In addition, in the embodiment, the fitting groove 2 was formed on the semi-cylindrical member A1, and the fitting protrusion 7 was formed on the semi-cylindrical member B6, but conversely, the fitting protrusion was formed on the semi-cylindrical member A1, and the fitting protrusion 7 was formed on the semi-cylindrical member B6.
A fitting groove may be formed in 6. In addition, the side plate 5 in which the film spool engagement hole 4 was formed was formed in the semi-cylindrical member A1, and the side plate 10 in which the film spool engagement hole 9 was formed in the semi-cylindrical member B6 was formed.
Conversely, the film spool engagement hole 9 is formed in the semi-cylindrical member A1.
Alternatively, the side plate 10 may be formed with a film spool coupling hole 4 formed in the semi-cylindrical member B6.

This invention, which divides the film storage chamber in this way, has a simpler synthetic resin molding shape than conventional ones, and reduces the risk of light leakage at the engaging part when the divided semi-cylindrical members are fixed and held as one unit. It has the advantage that the light-shielding material can be easily attached to the film lead-out guide tongue, the production thereof is extremely easy, and the work for installing the film inside is easy.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a perspective view of the film storage chamber main body, film suction chamber lid, and spool, and FIG. 2 is a perspective view of the semi-cylindrical member B taken along A-A The cross-sectional view, FIG. 3, is a cross-sectional view of the main part formed by loading the spool into the semi-cylindrical member A and fitting the semi-cylindrical member B into it. 1... Semi-cylindrical member A, 2... Fitting groove, 3, 8...
... Film lead-out guide tongue piece, 4, 9... Film spool fitting hole, 5, 10... Side plate, 6... Semi-cylindrical member B, 7... Fitting protrusion.

Claims (1)

[Claims] 1. A side plate which is a semi-cylindrical member divided into two in the axial direction, and has an engaging portion at one end of the side wall and a film lead-out guide tongue at the other end, and a film spool engagement hole is bored at one end surface of the side wall. 5, an engaging portion is formed at one end of one side wall, and a film lead-out guide tongue piece forming a film lead-out guide port together with the film lead-out guide tongue piece is formed at the other end of the side wall. It consists of a semi-cylindrical member B having a side plate 10 in which a film spool fitting hole forming the film spool fitting hole and a film spool receptacle is bored on one end surface, and a portion of the inner surface of each side plate in contact with the side wall. A groove is formed to fit into the convex portion of the brim portion of the film spool, and the engaging portions of the semi-cylindrical member A and the semi-cylindrical member B are engaged so as to maintain light shielding properties and are fixedly held together. Film cartridge made of synthetic resin.