JPH11218833A - Camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a camera equipped with a roller arm guiding film fed to a film take-up chamber from a film cartridge loaded in a cartridge chamber to a take-up shaft, where a control circuit controlling a magnetic head for recording and reading magnetic information on/from the film is protected from magnetic noise produced from a motor in the take-up shaft without providing a shield by disposing the control circuit to be opposed to the take-up shaft through the roller arm. SOLUTION: An MRC circuit 23 controlling a signal read from the film by the magnetic head 22 is disposed at a position where it is opposed to the take-up shaft 16 of the film take-up chamber 13 through the arm part 19b of the roller arm 19. The magnetic noise from the motor in the shaft 16 is intercepted by the arm part 19b. Thus, the MRC circuit 23 is protected from the magnetic noise without providing the shield.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera for photographing using magnetically recordable film.

[0002]

2. Description of the Related Art In recent years, a film cartridge containing a film capable of recording information such as a photographing condition and a photographing date as magnetic information has been proposed. The film cartridge has a film outlet and a light-shielding door for opening and closing the film outlet. When the light-shielding door is closed, the film is housed in the film cartridge in a state where the film is wound around the spool up to its leading end. When the light-shielding door is opened, the photographic film can be taken in and out from the film feeding port (for example, US Pat. No. 5,025,274).

On the other hand, various cameras using such a film cartridge have been proposed. This type of camera engages with a cartridge chamber for accommodating a film cartridge and a spool of the film cartridge accommodated in the cartridge chamber, and is driven to rotate in a forward or reverse direction by a motor when feeding or rewinding the film. A spool drive member for rotating and driving the spool, a film take-up chamber having a take-up shaft that is disposed at a position separated from the cartridge chamber with the film path interposed therebetween and takes up the film sent from the film cartridge. In the film path, there is provided a magnetic head for recording magnetic information on the film or reading magnetic information recorded on the film, and a control circuit for controlling the driving of the magnetic head. A motor is provided in the winding shaft of the film winding chamber, and the motor rotates the winding shaft of the film winding chamber. The control circuit is mounted on a flexible printed circuit board and is arranged between the camera body and the back cover.

[0004] The film winding chamber is provided with a roller arm for guiding the film fed into the film winding chamber to a winding shaft. The roller arm includes a roller having a rotation axis parallel to the rotation axis of the winding shaft, and an arm portion made of a leaf spring for pressing the roller against the winding shaft.

In such a camera, a control circuit for driving the magnetic head is provided with an amplifier for amplifying a signal read from the magnetic head or a signal representing information to be written on the magnetic head. Such an amplifier is very susceptible to magnetic noise and detects even a small amount of magnetic noise, so that noise may be mixed into a signal read from a film or a signal representing information to be recorded on the film. Since such magnetic noise is particularly generated by a motor disposed in the winding shaft of the film winding chamber, a shield is provided between the film winding chamber and the control circuit to block the magnetic noise. Have been.

[0006]

However, since the above-mentioned shield is provided between the film winding chamber and a control circuit provided on the rear side of the camera, the thickness of the camera is increased. The camera cannot be made compact. Further, since the shield needs to be provided as a separate component, the number of components is increased and the cost of the camera is increased.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide a camera which can be formed compact and which is inexpensive.

[0008]

The camera according to the present invention comprises:
A cartridge chamber in which a film cartridge accommodating a magnetically recordable film is loaded, a winding shaft for winding the film sent from the film cartridge and located at a position separated from the cartridge chamber by a film path, and a winding shaft for winding the film. A film winding chamber provided inside the winding shaft and having a motor for driving the winding shaft, a magnetic head for recording and / or reading the magnetic information on the film, and controlling the magnetic head The control circuit includes a roller unit provided in the film winding chamber, the roller unit having a rotation axis parallel to the rotation axis of the winding shaft, and a plate-shaped arm unit pressing the roller unit toward the winding shaft. A roller arm for guiding a film inserted into the film winding chamber to the winding shaft, Control circuitry, through the roller arm, is characterized in that shall become disposed at a position facing the winding shaft.

It is preferable that the roller arm is provided so as to cover substantially the entire control circuit with respect to the winding shaft.

Preferably, the roller arm is subjected to a surface treatment capable of being soldered.

Further, the control circuit may be arranged in a space between the film winding chamber and a rear cover of the camera in a state facing the film winding chamber. preferable.

[0012]

According to the camera of the present invention, the control circuit is provided so as to be opposed to the winding shaft via the roller arm, and the roller arm has a function as a shield. The magnetic noise generated from the motor is cut off by the roller arm and does not reach the control circuit. Therefore, it is possible to prevent the magnetic noise generated from the motor in the winding shaft from reaching the control circuit without providing a shield, thereby reducing the number of parts and reducing the cost of the camera. . Further, since there is no need to provide a shield between the control circuit and the film winding chamber, the size of the camera in the thickness direction can be reduced and the camera can be made thinner.

Further, by disposing the roller arm so as to cover substantially the entire control circuit with respect to the winding shaft, the control circuit can be more reliably shielded from magnetic noise generated from a motor inside the winding shaft. Can be.

Further, by applying a solderable surface treatment to the roller arm, the roller arm can be grounded, thereby preventing the charging of the roller arm.

Further, by providing the control circuit in the space between the film winding chamber and the back cover of the camera, the space in the camera can be effectively used to reduce the thickness of the camera. Thus, the camera can be made more compact.

[0016]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an exploded perspective view showing the structure of a camera according to an embodiment of the present invention, FIG. 2 is a sectional view taken along the line II of FIG. 1, and FIG. 3 is a perspective view showing the structure of a film cartridge.

A camera body 10 constituting a skeleton of the camera is provided with a photographing section 11 having an aperture at the center, and a cartridge chamber 12 and a film winding chamber 13 are provided with the photographing section 11 interposed therebetween. The film cartridge 1 is loaded into the cartridge chamber 12, and insertion and removal are performed by opening and closing a bottom cover (not shown) provided on the bottom surface of the camera body 10.

As shown in FIG. 3, the film cartridge 1 has a photographic film F on which a magnetic information can be recorded on a spool 3 disposed inside a cartridge body 2 formed by joining divided cases made of a resin molded product. Is wound and housed in a roll shape. A slit-shaped film outlet 4 is formed on the side surface of the cartridge body 2, and a light-shielding door 5 for opening and closing the film outlet 4 is rotatable within an angle range of approximately 90 ° inside the film outlet 4. Supported. The light-shielding door 5 is rotatably provided around an axis parallel to the axis of the spool 3, and has a shaft end 5 a exposed on an end face 2 a inserted into the interior of the cartridge chamber 12 for opening and closing the shaft. A notch 5b is provided, and this shaft end 5a
An opening / closing member (not shown) provided at the bottom of the cartridge chamber 12 is engaged with and rotated to open and close.

In the cartridge chamber 12 of the camera body 10, a spool drive shaft 14 is provided at the back from the top of the camera downward.
A key portion (not shown) is provided at the end of the cartridge cartridge 1. The loaded film cartridge 1 is engaged with the end of the spool drive shaft 14, and is accommodated in the film cartridge 1 by the forward or reverse rotation drive of the spool shaft 3. The film F is driven so as to perform feeding and rewinding.

On the other hand, a hollow cylindrical winding shaft 16 is provided in the film winding chamber 13, and a motor 17 for feeding and driving the film F is installed inside the winding shaft 16. The driving force of the motor 17 is controlled by a film feed mechanism (not shown) to drive the spool drive shaft 14 and the take-up shaft 16.
Is transmitted to Further, the film winding chamber 13 has first and second roller arms 1 for guiding the film F sent to the film winding chamber 13 to the winding shaft 16.
8, 19 are provided. First roller arm 18
Is a roller portion 18a having a rotation axis parallel to the rotation axis of the winding shaft 16, and an arm portion 18b made of a stainless steel leaf spring for pressing the roller portion 18a against the winding shaft 16.
One end of the arm 18b is fixed to the vicinity of the photographing unit 11 of the camera body 10. The second roller arm 19 includes a roller portion 19 a having a rotation axis parallel to the rotation axis of the winding shaft 16, and an arm made of a stainless steel leaf spring for pressing the roller portion 19 a against the winding shaft 16. And part 19b. And, as shown in FIG.
The second roller arm 19 has a mounting portion 19c extending from the arm portion 19b fixed to a side wall member 13a constituting a side wall of the film winding chamber 13, and is fixed to the rear side of the camera body 10 together with the side wall member 13a.

A flexible printed circuit board 21 mounted with a control circuit for controlling the driving of the camera via a pressure plate 20 is disposed on the back side of the photographing section 11. The flexible printed circuit board 21 includes a magnetic head 22 for reading magnetic information recorded on the film F, and an M for controlling a signal representing the magnetic information read by the magnetic head 22.
The RC (Mid Roll Change) circuit 23 is connected to the camera body 10.
It is implemented to face the side. The MRC circuit 23 reads the magnetic information recorded on the film F by the magnetic head 22 when using the film cartridge 1 photographed up to the middle frame, and can start the photographing from the frame where the photographing is not performed. That's what we do.

Such a flexible printed circuit board 21
Is disposed between the camera body 10 and the rear cover 24 of the camera via the pressure plate 20. The magnetic head 22 can read magnetic information recorded on the film F as shown in FIG. In addition, it is exposed to the film passage 11a of the photographing unit 11 through an opening 20a formed in the pressure plate 20. The MRC circuit 23 is disposed in a space between the film winding chamber 13 and the back cover 24 in a state facing the film winding chamber 13. Thereby, MRC
An arm 19b of the second roller arm 19 is interposed between the circuit 23 and the winding shaft 16 in the film winding chamber 13, whereby the arm 19b is connected to the winding shaft 16 by an MRC circuit. 23 is covered.

As described above, in the present embodiment, the MR
The C circuit 23 is connected to the arm 19 of the second roller arm 19.
b, the magnetic noise emitted from the motor 17 provided in the winding shaft 16 is cut off by the arm 19b.
It does not reach the RC circuit 23. Therefore,
The signal representing the magnetic information read from the magnetic head 22 is not mixed with the magnetic noise from the motor 17, so that the magnetic information can be read stably. Further, the magnetic noise generated from the motor 17 in the winding shaft 16 without providing a shield is generated by the MRC circuit 23.
Can be prevented, so that the number of parts can be reduced and the cost of the camera can be reduced.
Further, since there is no need to provide a shield between the MRC circuit 23 and the film winding chamber 13, the size of the camera in the thickness direction can be reduced, and the camera can be made thinner.

Further, since the MRC circuit 23 is disposed in the space between the film winding chamber 13 and the back cover 24, the space in the camera can be effectively used.
As a result, the thickness of the camera can be reduced and the camera can be made more compact.

In the above embodiment, the arm 19b of the second roller arm 19 may be subjected to a surface treatment such as nickel plating so that the arm 19b can be soldered. Thus, the ground can be taken from the arm 19b, and the arm 19b can be prevented from being charged by magnetic noise generated from the motor 17.

In the above embodiment, the magnetic head 22 reads the magnetic information recorded on the film F, and the signal representing the magnetic information is controlled by the MRC circuit 23. It is needless to say that the present invention can be applied to a device provided with a circuit for recording magnetic information on the film F through the intermediary, or a device provided with a circuit for performing both reading and recording. .

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a configuration of a camera according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line II of FIG. 1;

FIG. 3 is a perspective view showing a configuration of a film cartridge.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Film cartridge 10 Camera main body 11 Imaging part 12 Cartridge chamber 13 Film winding chamber 16 Winding shaft 17 Motor 18, 19 Roller arm 18a, 19a Roller part 18b, 19b Arm part 20 Pressure plate 21 Flexible printed circuit board 23 MRC circuit

Claims (4)

[Claims] 1. A cartridge chamber in which a film cartridge accommodating a magnetically recordable film is loaded, and a winding chamber which is located at a position separated from the cartridge chamber with a film path interposed therebetween and winds up the film sent from the film cartridge. A film winding chamber having a winding shaft and a motor provided inside the winding shaft and driving the winding shaft; a magnetic head for recording and / or reading the magnetic information on the film; A control circuit for controlling the magnetic head, a roller portion provided in the film winding chamber and having a rotation axis parallel to the rotation axis of the winding shaft, and a plate-shaped member for pressing the roller portion toward the winding shaft. And a roller arm for guiding the film inserted into the film winding chamber to the winding shaft. In the camera said control circuit, through said roller arm, and characterized by being arranged at a position facing the winding shaft. 2. The camera according to claim 1, wherein the roller arm is disposed so as to cover substantially the entire control circuit with respect to the winding shaft. 3. The camera according to claim 1, wherein the roller arm has been subjected to a solderable surface treatment. 4. The control circuit is arranged in a space between the film take-up chamber and a rear cover of the camera in a state facing the film take-up chamber. The camera according to claim 1.