JPH03181932A - Camera using film with magnetic storing part - Google Patents

Abstract

PURPOSE:To detect the feed quantity of the film with simple constitution according to read information by driving a magnetic head for writing in synchronism with the read of the information by a magnetic head for reading. CONSTITUTION:The camera is equipped with the magnetic head 6 for writing which writes information on magnetic storing parts 3 and 4 provided on the film 1 and the magnetic head 7 for reading which is arranged at a specific interval with the magnetic head 6 for writing and reads the written information out. Further, the camera is provided with a driving means which drives the magnetic head 6 for writing an synchronism with the read of the information by the magnetic head 7 for reading and a feeding quantity detecting means which detects ta film feeding quantity according to the information read out by the magnetic head 7 for reading. Thus, information is written at specific intervals and the feeding quantity of the film 1 is found from the number of read pieces of information to detect the feeding quantity of the film with the simple constitution.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Application of the Invention) The present invention relates to a camera using a film with a magnetic storage section, each of which has a magnetic head for writing and reading information.

(Background of the Invention) Conventionally, film feed amount has been detected mechanically or optically. In other words, for example, by connecting a sprocket to the perforations of the film and detecting the rotational position of the sprocket, the amount of film feed can be detected, or by irradiating light onto the film and determining the amount of feed of the perforations on the film based on the presence or absence of the reflected light. was used to detect the position of the film. Therefore, there was a problem that the configuration became complicated.

(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 storage unit that can detect the amount of film feed with a simple configuration.

(Features of the Invention) In order to achieve the above object, the present invention includes a write magnetic head for writing information into a magnetic storage section provided on a film, a write magnetic head disposed at a predetermined interval from the write magnetic head, and a a reading magnetic head for reading information written on the part; a driving means for driving the writing magnetic head in synchronization with the reading of information by the reading magnetic head; and a driving means for driving the writing magnetic head in synchronization with the reading of information by the reading magnetic head. and a feed amount detection means for detecting the film feed amount based on the information read out by the apparatus, and is configured to write information at predetermined intervals and calculate the film feed amount from the number of times the information is read. It is characterized by the following.

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

1 and 2 show an embodiment of the present invention, FIG. 1 shows a circuit configuration, and FIGS. 2(a) to 2(c) show a magnetic storage section used in the present invention. FIG. 3 is a diagram showing the positions of a film and magnetic heads for writing and reading, respectively.

In these figures, 1 is a film on which a magnetic layer is formed, 2 is a perforation, and 3.4 is a magnetic storage part (
(recording track), 5 is a photosensitive surface, 6 is a magnetic head for writing, 7 is a magnetic head for reading, 8.9 is a presser pad, 10
is a capacitor, 11 is a resistor, 12 is a reference voltage source, 13 is a voltage comparison circuit, 14 is an OR gate, 15, 16.18 is a D flip-flop, 17.19 is an AND gate, 20
21 is an NPN transistor, 21 is a PNP transistor, and 22 is a microcomputer that performs various controls.

As shown in FIGS. 2(b) and 2(c), the write magnetic head 6 and the read magnetic head 7 are arranged at a distance xO with respect to the magnetic storage section 3. It is assumed that the film 1 is moved in the direction of arrow C by a motor (not shown).

Next, the operation will be explained using FIGS. 1 and 3. still,
CK in FIG. 3 is a system clock signal supplied from an oscillation circuit (not shown), and START is a write start signal output from the microcomputer 22.

When the write start signal S tart is applied, the data input signal D ata of the D flip-flop 15 via the OR gate 14 becomes the write start signal S tart.
It becomes "1" like t. Then, D flip-flop 15.16, AND gate 17, D flip-flop 1
The write signal Drive output from the AND gate 19 via the AND gate 8 is synchronized with the system clock signal CK and becomes a signal for two shots of the system clock signal CK (the third
(see figure). By generating the signal Drive, PN
P transistor 20 is on, NPN transistor 21
is turned off, a write current flows through the write magnetic head 6, a magnetic flux is generated, and "1" is written on the magnetic recording track 3.

Since the film 1 is driven by a motor (not shown), the portion where "1" is written on the magnetic storage section 3 comes into contact with the reading magnetic head 7 thereafter. Then, since the voltage passing through the capacitor 10 and the resistor 11 is configured to be higher than the reference voltage input from the reference voltage source 12, the output signal Co of the voltage comparison circuit 13
mp becomes "1". Therefore, the data input signal D ata applied to the data input terminal of the D flip-flop 15
becomes "1", and the write signal Drive output from the AND gate 19 also becomes rlJ. As a result, "1" is written on the magnetic storage section again.

Therefore, "1" is written on the magnetic recording track 3 of the film 1 at every interval (distance Xo) between the write magnetic head 6 and the read magnetic head 7, and "0" is written in all other areas. Therefore, by counting how many times this signal has been written by the microcomputer 22, the film feed amount can be detected.

Note that in order to synchronize with the system clock CK, the film 1 may be moved by an additional ΔX as shown in FIG. 3, but since the system clock CK is sufficiently fast, the ΔX relative to the distance XQ can be ignored.

FIG. 4 shows another embodiment of the present invention, in which:
23 is a microcomputer.

Further, the same parts as in FIG. 1 are given the same reference numerals.

The difference from the embodiment described above is that the data written on the magnetic storage section 3 is a pulse signal in FIG. 1, whereas in this embodiment it is serial data. Below, the fifth
The operation will be explained using the flowchart shown in the figure.

[Step 1] Set the counter N in the microcomputer 23 to rOJ. At the same time, a motor (not shown) for feeding the film is turned on.

[Step 2] For example, a hexadecimal number A (rloloJ in binary) is output as the write signal Drive. Then, when the write signal Drive is "1", the NPN transistor 20 is turned on, and when the write signal Drive is rOJ, the PNP I-transistor 21 is turned on, and each of the four signals is written on the magnetic recording track 3.

[Step 3: Read the serial data input from the voltage comparison circuit 13.

[Step 4] Compare the serial data read from the voltage comparison circuit 13 with the serial data output as the write signal Drive. If they match, the process proceeds to step 5; if they do not match, the process returns to step 3.

[Step 5] Increment internal counter N by 1.

[Step 6] The internal counter N compares with a constant M determined by one screen in the photograph and the distance between the magnetic heads 6 and 7 (distance X◇). As a result, if they match, the process proceeds to step 7; if they do not match, the process returns to step 2.

[Step 7] Turn off the motor (not shown) and stop film feeding.

According to this embodiment, the magnetic write head and the magnetic read head are arranged at a certain interval, and these heads repeatedly write and read information as the film moves, so the film position can be detected. There is no need to arrange containers, etc., and the configuration becomes simple. Furthermore, each of the heads is also used for writing and reading photographic information, so there is an advantage that the heads can be shared.

(Effects of the Invention) As described above, according to the present invention, there is provided a magnetic write head for writing information into a magnetic storage section provided on a film, and a write magnetic head disposed at a predetermined interval from the magnetic storage section provided on the film. a reading magnetic head for reading information written on the part; a driving means for driving the writing magnetic head in synchronization with the reading of information by the reading magnetic head; and a driving means for driving the writing magnetic head in synchronization with the reading of information by the reading magnetic head. and a feed amount detection means for detecting the film feed amount based on the information read out by the apparatus, and is configured to write information at predetermined intervals and calculate the film feed amount from the number of times the information is read. Therefore, it becomes possible to detect the film feed amount with a simple configuration.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing one embodiment of the present invention, FIG. 2 is a diagram showing a film having a magnetic storage section used in the present invention and the positions of magnetic heads for writing and reading in this embodiment, and FIG. The figure is a time chart in one embodiment of the present invention, FIG. 4 is a circuit diagram showing another embodiment of the present invention, and FIG. 5 is a flow chart showing its operation. 1...Film having a magnetic storage section, 6...
...Magnetic head for writing, 7...Magnetic head for reading, 10...Capacitor, ■1...
...Resistance, 12...Reference voltage source, 13...
...Voltage comparator circuit, 15,16°18...D flip-flop, 17.19...AND gate, 20.21...Transistor, 22.23...
...Microcomputer.

Claims (1)

[Claims] (1) A write magnetic head that writes information to a magnetic storage section provided on a film, and a read magnetic head that is arranged at a predetermined distance from the write magnetic head and reads information written in the magnetic storage section. and a driving means for driving the write magnetic head in synchronization with the reading of information by the read magnetic head.
A camera using a film with a magnetic storage unit, comprising a feed amount detection means for detecting a film feed amount based on information read by the reading magnetic head.