JPH0524897Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a film information detection device, and particularly to a film information detection device for detecting a film information pattern on the outer periphery of a film cartridge.

<Prior Art> Conventionally, as this type of device, various types of constituent means consisting of a contact member, a spring member, and a flexible printed circuit board are known. For example, one type thereof is the configuration described in Japanese Patent Application Laid-open No. 158424/1983.

In this conventional example, a cap-shaped contact member is movable by being biased by a conductive spring member, and both ends of this spring member are configured to contact the contact member and the pattern portion of the flexible printed circuit board, respectively. There is.

<Problems to be solved by the invention> However, in the configuration of the conventional example described above, the end face of the movable contact member may come into direct contact with the pattern part of the flexible printed circuit board, causing damage to the pattern part. The end face of the spring member on the pattern side may be misaligned, causing poor contact or hindering the movement of the contact member, resulting in a lack of reliability.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the drawbacks of the prior art and provide a film information detection device with a simple structure and high reliability.

<Means for solving the problems> The structure of the present invention to achieve the above-mentioned purpose is as follows:
This will be explained using FIG. 1 and FIG. 2 which correspond to the embodiment.

The present invention is a film information detection device for detecting a film information pattern on the outer periphery of a film cartridge. a spring regulating member that comes into contact with the spring 6 and the flexible printed circuit board 8, regulates displacement of the compression coil spring 6, and prevents the rear end portion 5d of the contact member 5 from coming into direct contact with the flexible printed circuit board 8; It is composed of 7.

<Function> A coil spring 6 for biasing the cap-shaped contact member 5 is provided on the front surface of the flexible printed circuit board 8, so that when the contact member 5 is pushed in when loading the film cartridge, the rear end 5d Since the contact member 5 contacts the spring regulating member 7 and does not directly contact the flexible printed circuit board 8, there is no risk of damaging the pattern portion.

In addition, since the coil spring 6 has the effect of regulating the displacement of the contact end point with the pattern portion of the flexible printed circuit board 8 by the spring regulating member 7, it is effective in terms of the reliability of electrical continuity and the reliability of the movement of the contact member 5. It is.

<Example> Hereinafter, an example of the present invention will be described based on FIGS. 1 to 4.

The film information detection device is composed of a holding frame 3, a contact holding member 4, a contact member 5, a compression coil spring 6, a spring regulating member 7, a flexible printed circuit board 8, and a holding plate 9 as a unit.

The inner surface of the holding frame 3 has an arcuate surface that matches the inner surface of the cartridge chamber of the camera body 11, and a sliding opening 3a into which the contact holding part 4a of the contact holding member 4 is fitted is provided in the middle part thereof. On the outer surface thereof, engaging protrusions 3b are provided at the four corners, and positioning bosses 3c are provided on both the upper and lower sides. The contact holding member 4 is made of an insulating material, and a plurality of (six in the illustrated example) contact holding holes 4b are arranged in a line in the contact holding portion 4a. The contact member 5 is formed into a cap shape by drawing a metal plate, and has a ring-shaped protrusion 5a and a recess 5b having a substantially rounded shape at its tip, and has an outer end where the compression coil spring 6 enters and an open end. A plurality of bent rear end portions 5d (six in the illustrated example) are provided. The spring regulating member 7 is made of an insulating material, and has a positioning hole 7a that fits with the positioning boss 3c of the holding frame 3 and a plurality of (six in the illustrated example) spring regulating holes 7 at both upper and lower ends thereof.
b are arranged in a row. The flexible printed circuit board 8 has a pattern portion 8a and a pair of mounting holes 8b at one end thereof, and the pair of mounting holes 8b form a pair of protrusions 9 protruding from one end of the inner surface of the holding plate 9.
It is positioned at point a and bonded to the holding plate 9. The holding plate 9 is made of a thin metal plate, and the projections 9a
is formed by half-blanking, and an engaging portion 9b and a positioning hole 9c are formed on both upper and lower sides of one end thereof, with which the engaging protrusion 3b and positioning boss 3c of the holding frame 3 engage, respectively. There are screw holes 9d for attaching to the camera body 11 with screws 10 and positioning bosses 11 for the camera body 11.
A positioning hole 9e that engages with the hole 9a is provided.

Therefore, in the assembly structure of this film information detection device, a contact holding member 4 is inserted into the sliding opening 3a of the holding frame 3.
The contact holding portions 4a are fitted, and the contact members 5 are respectively inserted into the six contact member holding holes 4b.
Next, the positioning boss 3c of the holding frame 3 and the positioning hole 7a of the spring regulating member 7 are aligned, the spring regulating member 7 is attached, and the hollow part 5c of the contact member 5 is passed through the six spring regulating holes 7b of the spring regulating member 7. Insert coil spring 6 into each. In this case, the mounting height of the spring regulating member 7 is regulated by the holding frame 3, and its plate thickness is set larger than the pitch of the coil spring 6, so that the spring 6 is not inserted into the spring regulating hole 7b.
The length of the spring 6 is set so that one end of the spring 6 protrudes outward from the spring regulating hole 7c. Note that the spring regulating hole 7b is slightly larger than the outer diameter of the coil spring 6, but the rear end 5 of the contact member 5
Since it is set smaller than d, insertion of the coil spring 6 is possible, but insertion of the contact member 5 is prohibited, and contact between the flexible printed circuit board 8 and the contact member 5 can be prevented.

Next, the holding plate 9 to which the flexible printed circuit board 8 is adhered is positioned by its positioning hole 9c and the positioning boss 3c of the holding frame 3, and is attached to the holding frame 3. In this case, the spring 6 is compressed and the holding frame 3
The engaging protrusion 3b is elastically deformed by contact with the engaging part 9b of the holding plate 9, and when pushed to a predetermined position, the engagement between the engaging protrusion 3b and the engaging part 9b is completed and the unit is formed. . This unit is installed so that the holding frame 3 fits into the opening 11b of the cartridge chamber of the camera body 11, and is positioned using the positioning boss 11a of the camera body 11 and the positioning hole 9e of the holding plate 9, and screwed with the screw 10. It is fixed to the camera body 11 through the hole 9d, and the assembly is completed as shown in FIG.

In the attached state of the camera body 11 shown in FIG. The contact member 5 is urged by a coil spring 6 to protrude toward the center of the cartridge chamber of the camera body 11, and one end of the coil spring 6 is connected to a hollow portion 5c of the contact member 5.
The flexible printed circuit board 8 is in contact with the end surface of the flexible printed circuit board 8, and is positioned with a predetermined gap in the radial direction.
It abuts on the pattern portion 8a and is held by the rigidity of the retaining plate 9, and its displacement in the radial direction is regulated by the spring regulating hole 7b of the spring regulating member 7.

Therefore, when the film cartridge 1 shown in FIG. 5 is loaded in the cartridge chamber of the camera body 11 as shown in FIG. It is pushed in by the partial outer periphery of pattern 2. At this time, the contact holding member 4 regulates the amount of protrusion of the contact member 5 when the film cartridge is not loaded as shown in FIG. 1, but is designed to prevent the contact member 5 from being caught when the film cartridge is loaded. Then, the contact holding member 4 and the rear end portion 5d of the contact member 5 are pushed into the spring regulating member 7, respectively.
There is no risk of damage to the pattern portion 8a due to direct contact with the flexible printed circuit board 8. Further, the spring regulating hole 7b of the spring regulating member 7 is connected to the pattern portion 8a of the coil spring 6.
Since it has the effect of regulating the displacement of the abutting end with the contact member 5, it is effective in terms of the reliability of electrical continuity and the reliability of the movement of the contact member 5. Further, the electrical conduction system is connected to the film information pattern 2→contact member 5→coil spring 6→pattern portion 8a, and a required film information signal is transmitted.

Here, the contact state between the film information pattern 2 portion of the film cartridge 1 and the contact member 5 is the fourth.
As shown in Figures a and b, a spring 6 is in contact with the inner surface of a ring-shaped protrusion 5a at the tip of the contact member 5, and the ring-shaped protrusion 5a and the film information pattern are connected to the contact points _P1 and _P2 . There is a two-point contact. Therefore, by providing play in the contact member 5 and the contact holding portion 4a of the contact holding member 4, even if an error factor such as the tilt of the film cartridge 1 occurs, the contact will not be lost.
Two-point contact between P ₁ and P ₂ can be ensured, and since the ring-shaped protrusion 5a of the contact member 5 has an R shape, the reliability of signal transmission can be improved without damaging the film information pattern of the film cassette 1. It becomes possible to improve the performance.

<Effect of the invention> As explained above, the present invention prevents the contact member from damaging the pattern part of the flexible printed circuit board by providing a spring regulating member on the front surface of the flexible printed circuit board, and ensures that the end face of the coil spring is misaligned. This has the effect of preventing electrical conduction, ensuring smooth movement of contact members, increasing reliability, and ensuring reliable assembly.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a main part of an embodiment of the film information detection device for a camera according to the present invention, FIG. 2 is an exploded perspective view thereof, FIG. 3 is a sectional view of a main part when a film cartridge is loaded into the camera, Figures a and b are explanatory diagrams of the state of contact between the film cartridge and the contact member, where a is a cross-sectional view, b is a cross-sectional view taken along the line A-A of a, and Figure 5 shows a film information pattern to be used in the present invention. FIG. 3 is a perspective view of the film cartridge. DESCRIPTION OF SYMBOLS 1... Film cartridge, 2... Film information pattern, 3... Holding frame, 4... Contact holding member, 5... Contact member, 5d... Rear end portion, 6... Compression coil spring, 7... Spring Regulation member, 7b... Spring regulation hole, 8... Flexible printed circuit board, 9
...Holding plate, 11...Camera body.

Claims (1)

[Scope of utility model registration request] In a film information detection device for detecting a film information pattern on the outer periphery of a film cassette, a contact member in contact with the outer periphery of the film cassette and a printed circuit board are electrically connected to each other, and the contact member is connected to the outer periphery of the film cassette. a coil spring that presses against the outer periphery; and a spring regulating member that is arranged to overlap the printed circuit board and has a regulating hole that allows insertion of the coil spring but prohibits insertion of the rear end of the contact member. A film characterized in that when the contact member moves in the direction of the printed circuit board, it is possible to restrict displacement of the coil spring in the radial direction and prevent contact between the contact member and the printed circuit board. Information detection device.