JPH0432086A - Camera for using film with magnetic storage part - Google Patents

Abstract

PURPOSE:To prevent the malfunction which occurs at the time of writing or reading out information by a magnetic head by covering a wiring part to the magnetic head with a head fixing member and a magnetic shielding member so that an external noise does not get on this part. CONSTITUTION:A flexible printed board 16 is constituted of a connecting part 16a to a magnetic head 11, an amplifying circuit mounting part 16b, and a wiring part 16c to a camera main body 1 side. A shielding plate 18 having a magnetic shielding effect has bend parts 18a - 18c for preventing a noise from going into the flexible printed board 16 to the utmost, and is fixed to a member 13 and 14 with a screws through the flexible printed board 16. Also, the flexible printed board 16 is covered with the shielding plates 12, 18 in a box shape, and a noise which gets on easily in the wiring part extending from the magnetic head 11 to its amplifying circuit part 17 is cut. In such a way, a malfunction which occurs at the time of writing or reading out information by the magnetic head can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Application of the Invention) The present invention relates to an improvement in a camera that uses a film with a magnetic storage section that has a magnetic head that writes information to or reads information from a magnetic storage section provided on the film. be.

(Background of the Invention) Conventionally, a camera that uses a magnetic head to write information to and read information from a magnetic storage section provided on a film has been disclosed in US Pat. No. 4,864,332 and the like. The applicant has also proposed various mechanical configurations for accurately operating the magnetic head in conjunction with film feeding.

However, the above conventional example had the following problems.

In other words, cameras in recent years have become smaller, and the magnetic head and film feeding motor are placed close together, but for this reason the wiring between the magnetic head and its amplifier circuit is quite large. Since the output of the magnetic head is very small, at least for a short period of time, noise from the motor etc. is likely to be applied to this portion, resulting in an inconvenience in that it causes malfunctions when writing or reading information.

(Object of the Invention) An object of the present invention is to provide a camera using a film with a magnetic storage unit that can solve the above-mentioned problems and prevent malfunctions when writing or reading information by a magnetic head.

(Features of the Invention) To achieve the above object, the present invention provides a magnetic shield in which at least the surface of a head fixing member is made of a material having a magnetic shielding effect, and a flexible printed circuit board is sandwiched between the head fixing member and the head fixing member. A member is provided, and the wiring portion to the magnetic head is covered with the head fixing member and the magnetic shielding member to prevent external noise from entering this portion.

(Embodiments of the Invention) Hereinafter, the present invention will be described in detail based on illustrated embodiments.

1 to 4 show a first embodiment of the present invention, in which FIG. 1 is a perspective view of the configuration of the main parts, FIG. 2 is a back view of the camera, and FIG. The sectional view of Figure 2 is taken from the 4th
The figures each show a sectional view taken along line BB in FIG.

In these figures, 1 is the camera body, 2 is the finder, 3 is the cartridge chamber, 4 is the fork, 5 is the spool chamber,
Reference numeral 6 indicates a film provided with a magnetic memory portion, and reference numeral 7 indicates a pressure plate having portions 7a and 7b on which the springs 9 and 10 are attached. 13.14
is a member that has the role of guiding the film 6 and also serves as a base plate of a flexible printed circuit board, which will be described later.
The spring hook of the spring 10 has a portion 13b, the member 14 has a protrusion 14a that comes into contact with the end of the film 6, the spring hook of the spring 9 has a portion 13b, and two protrusions 14c1, 14c2 and two. Screw hole 14c314C4 and head fixing hole 14c5
6 and 12 are shield plates having a magnetic shielding effect, and the members 13 and 14 are integrally formed at both ends thereof, and these are generally made by insert molding or the like. . The shield plate 12
A hole 12a is provided in the center of the camera body 1, and the camera body 1 is fixed to the camera body 1 via a hole 12a and a step 19.
Since the large size 12a is long, the shield plate 12 is a member 1.
3.14, it is not only rotatable around the stepped screw 19 but also vertically movable. Furthermore, said member 13.14
The spring hook is the spring 9.10 hooked on parts 13b and 14b.
Since the shield plate 12 is pulled by the film 6, the shield plate 12 always moves in accordance with the fluctuation of the film 6. Further, in the head fixing portion 12c of the member 14, a holding plate 15 holding the magnetic helad 11 is fitted into the protrusions 12c1, 12c2, positioned, and fixed with screws.

Reference numeral 16 designates a flexible printed circuit board for wiring the magnetic helad 11, its amplifier circuit section 17, and a control circuit section (not shown) on the side of the camera body 1, which includes a connection section 16a with the magnetic helad 11, and an amplifier circuit mounting section. It has a wiring part 16b and a wiring part 16c to the camera body 1 side. Reference numeral 18 denotes a shield plate having a magnetic shielding effect, which has bent portions 18a, 18b, and 18c to prevent noise from entering the flexible printed circuit board 16 as much as possible, as is clear from FIG. and 14 through the flexible printed circuit board 16 and fixed with screws.

As in the above embodiment, since the flexible printed circuit board 16 is covered in a box shape by the shield plates 12 and 16, noise that is easily picked up in the wiring section from the magnetic head 11 to its amplifier circuit section 17 is cut. becomes possible.

5 and 6 show a second embodiment of the present invention, FIG. 5 is a perspective view of the structure of the main part, and FIG.
A sectional view taken along line C-C is shown in each figure. The same parts as in the first embodiment are given the same reference numerals.

20 is the shield plate 12 and member 13.1 of the first embodiment
It is a shield plate where the part 4 is made of a single piece of plastic material, and because it is easy to pick up noise if it is simply made of plastic material, conductive coating is applied to the surface of black material containing carbon fiber or plastic material. things are used.

A shield plate 21 has a magnetic shielding effect and is fixed to the shield plate 20 with screws while sandwiching the flexible printed circuit board 16 therebetween.

Also in this second embodiment, since the flexible printed circuit board 16 is sandwiched between the shield plates 20 and 21, noise that is easily picked up in the wiring section from the magnetic head 11 to the amplifier circuit section 17 is cut. It becomes possible to do so.

Therefore, information can always be written and read accurately using the magnetic head.

(Correspondence between the invention and the embodiment) In this embodiment, the shield plate 121 member 1314 or the shield plate 20 corresponds to the head fixing member of the present invention, and the shield members 18 and 21 correspond to the magnetic shield member.

(Effects of the Invention) As described above, according to the present invention, at least the surface of the head fixing member is made of a material having a magnetic shielding effect, and the flexible printed circuit board is sandwiched between the head fixing member and the magnetic shield. Since the wiring part to the magnetic head is covered with the head fixing member and the magnetic shielding member to prevent external noise from entering this part, it is difficult to write or read information by the magnetic head. This makes it possible to prevent malfunctions at times.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the configuration of the main parts in the first embodiment of the present invention, FIG. 2 is a rear view of the camera, FIG. 3 is a sectional view taken along line A-A in FIG. 2, and FIG. Figure 2 B-B sectional view,
FIG. 5 is a perspective view of the configuration of main parts in a second embodiment of the present invention, and FIG. 6 is a sectional view taken along line CC in FIG. 1...Camera body, 7----pressing plate, 9.
10... Spring, 11... Magnetic head,
12.18.20゜21... Shield plate, 16
...Flexible printed circuit board, 17...
...Amplification circuit section.

Claims (1)

[Claims] (1) A magnetic head that writes information to or reads information from a magnetic storage section provided on the film; a head fixing member that holds the magnetic head and is configured to move to follow fluctuations in the film; and the head In a camera using a film with a magnetic storage unit, which includes a flexible printed circuit board for wiring the magnetic head held by a fixing member and other circuits, at least the surface of the head fixing member is made of a material having a magnetic shielding effect. What is claimed is: 1. A camera using a film with a magnetic memory section, characterized in that the camera is constructed of: a magnetic shielding member that sandwiches the flexible printed circuit board with the head fixing member;