JPH03181931A - Camera using film with magnetic memory - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Application of the Invention) The present invention relates to a camera that uses a film with a magnetic storage unit and is equipped with a magnetic head for writing and reading information.

(Background of the invention) Conventional examples of this type are shown in FIGS. 6 and 7.

In FIGS. 6 and 7, 1 is a film with a magnetic layer 2 formed on the back surface, 3 is a photoreceptor layer & base film, and 4 is a film with a magnetic layer 2 formed on the back side.
．． 5 is a magnetic storage section (recording track) on which information is written using a magnetic head, which will be described later; 6 is a perforation;
7 is a photosensitive surface, 8 is information writing on the film I (sixth
(in the direction of the arrow in the figure) and a magnetic head that performs reading,
It is arranged on the magnetic storage sections 4 and 5.

The film 1 having the magnetic storage sections 4 and 5 is loaded so that the magnetic layer 2 faces the camera back cover side and the photoreceptor layer & base film 3 faces the camera body side. Therefore, the magnetic head 8 is disposed on the back cover side, and since the back cover has almost no thickness, the magnetic head 8 has a protruding shape.

In this way, because the magnetic head 8 is placed on the back cover side,
Conventionally, there was a problem in that a protrusion appeared on the back cover side.

(Objective of the Invention) An object of the present invention is to solve the above-mentioned problems and to provide a camera using a film with a magnetic memory section that can be shaped without a protrusion on the back cover side.

(Features of the Invention) In order to achieve the above object, the present invention provides a magnetic head that is arranged on the photosensitive surface side of the film surface and records information by magnetizing perpendicularly to a magnetic storage section provided on the film. The present invention is characterized in that the magnetic head is disposed on the photosensitive surface side of the film surface, which already has a protrusion due to the arrangement of various members such as a photographic lens.

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

1 and 2 show a first embodiment of the present invention, FIG. 1 is a diagram showing the arrangement of the magnetic head, and FIG. 2 is a circuit diagram for controlling the writing and reading of the magnetic head. . 6th
．． The same parts as in FIG. 7 are given the same reference numerals.

In these figures, 9 is a magnetic body used as a part of forming a magnetic path placed on the back cover side, 10 is a magnetic head placed on the camera body side, 11 is a capacitor, 1
2 is a resistor, 13 is a reference voltage source that generates a reference voltage, 14
1 is a voltage comparator, 15 is a microcomputer in charge of various controls, 16 is a PNP l-transistor, and 17 is an NPN transistor.

As shown in FIG. 1, the magnetic body 9 and the magnetic head 10 are arranged to sandwich the film 1 (a magnetic storage section not shown in FIG. 1).

Next, the operation will be explained.

First, when writing information such as shutter speed and aperture, the microcomputer 15 turns on and off the PNP l-transistor 16 according to the information to be written. When the PNP l-transistor 16 is turned on in response, a write current flows through the magnetic head 10, a magnetic flux as shown by the arrow in FIG. 1 is generated, and a portion of the magnetic storage section is magnetized. As a result, the information rlJ is written on the magnetic storage section (see FIG. 7), which is not shown in FIG.

Further, when reading information from the magnetic storage section, the microcomputer 15 uses a PNP transistor 16 and an N
Both PN transistors 17 are turned off. Then, when the film 1 on which information has been written is moved by a feeding means (not shown) and the magnetized part (the part with information "1") comes onto the magnetic head 10, the voltage comparator 14 is non-inverted. The voltage applied to the input terminal via the capacitor 11 and resistor 12 becomes higher than the reference voltage input to the inverting input terminal, and a signal of "1" is input from the voltage comparator 14 to the microcomputer 15. The microcomputer 15 reads out information by reading the input signal.

FIG. 3 shows a second embodiment of the present invention, in which the shape of the magnetic body placed on the back cover side is changed as shown in 18,
The magnetic body 18 is prevented from coming into close contact with the film 1 so that the magnetized area is small (narrow range).

FIG. 4 shows a third embodiment of the present invention, in which a magnetic body 19 on the back cover side is made of a flexible magnetic material, and a film is formed between the magnetic body 19 and the magnetic head 10 on the main body side. 1 is sandwiched between the two to prevent the formation of spaces, thereby improving magnetic permeability.

FIG. 5 shows a fourth embodiment of the present invention, in which 2
0 is a magnetic head disposed on the main body side, 21 is a magnetic body, and in the first to third embodiments, writing is performed in two places at the same time, but in this embodiment, writing and writing are performed simultaneously. Only one part is used for reading.

According to this embodiment, since information is written by magnetizing the film perpendicularly to one surface, there is no need to arrange a magnetic head on the back cover side (although a magnetic body is arranged).
This is a thin plate shape), making it possible to eliminate the protrusion on the back lid side.

(Effects of the Invention) As explained above, according to the present invention, since the magnetic head is disposed on the photosensitive surface side of the film surface, which already has a protrusion due to the arrangement of various components such as the photographic lens, the back cover It can be shaped without side protrusions.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the arrangement of a magnetic head in a first embodiment of the present invention, FIG. 2 is a circuit diagram also showing a write and read control system of the magnetic head, and FIG. 3 is a diagram showing a second embodiment of the present invention. FIG. 4 is a diagram showing the arrangement of the magnetic head in the third embodiment of the present invention, and FIG. 5 is a diagram showing the arrangement of the magnetic head in the fourth embodiment of the present invention. FIG. 6 is a diagram showing the arrangement of a conventional magnetic head, and FIG. 7 is a diagram showing a part of a film having a magnetic storage section. 1...Film, 2...Magnetic layer, 4
．． 5...Magnetic storage section, 9...Magnetic material,
10...Magnetic head.

Claims (1)

[Claims] (1) A magnetic head that is disposed on the photosensitive surface side of the film surface and records information by perpendicularly magnetizing a magnetic storage section provided on the film, and a control means that controls the drive of the magnetic head. A camera that uses film with magnetic storage.