JPH04289843A - Camera having magnetic head - Google Patents

Abstract

PURPOSE:To attain magnetic recording or reading by decreasing lateral directional size of a camera further without shading photographing light. CONSTITUTION:A feed means for supplying a film 22, magnetic head 10 for recording or reading information in or from a magnetic recording region provided on the film at supply time thereof, pad 11 made switchable to an advancing position (a) advanced into a photographic optical path and to a refuge position (b) taking refuge from the photographic optical path to press the magnetic recording region of the film to the magnetic head 10 in the advancing position and a drive control means for holding the pad 11 at the refuge position at least during the time of opening a shutter and also driving the pad 11 to the advancing position prior to action of the magnetic head 10 are provided.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera equipped with a magnetic head for recording information on or reading information from a magnetic recording area of a film.

0002

2. Description of the Related Art FIG. 5 is a perspective view of a conventional camera of this type. In FIG. 5, 5 is an aperture, 3 is a winding spool stored in the spool chamber 4, 21 is a cartridge loaded in the cartridge chamber 2, and 22 is this cartridge 21.
A magnetic recording area 22a is provided on this film 22. Further, 10 is a magnetic head for magnetic recording, and 11 is a pad placed opposite to the magnetic head 10 with the film 22 in between.Because this pad 11 is provided, the magnetic head 10 can be applied with a predetermined pressing force. It is possible to make contact with the magnetic recording area 22a while holding it. When one frame is photographed, the winding spool 3 is rotated to wind the film 22, and at this time the magnetic head 10 records information in the magnetic recording area 22a. The information to be recorded may include, for example, the exposure conditions at the time of photographing, the date of photographing, or trimming information specifying whether or not to perform trimming.

0003

[Problems to be Solved by the Invention] However, if such a magnetic head 10 and pad 11 were to be provided below the aperture 5, a part of the pad 11 would enter the photographing optical path, and the There is a risk that the light beam will be vignetted and an undesirable photograph will be taken. To prevent this, it is necessary to provide the magnetic head 10 and pad 11 between the aperture 5 and cartridge chamber 2, or between the aperture 5 and spool chamber 4, as shown in the figure. However, in this case, it is necessary to increase the distance between the aperture 5 and the cartridge chamber 2 or the distance between the aperture 5 and the spool chamber 4 by the width of the magnetic head 10 or pad 11. There is a problem that the lateral dimension becomes long.

SUMMARY OF THE INVENTION An object of the present invention is to provide a camera that has a magnetic head that can reduce the horizontal dimension of the camera and that can perform magnetic recording or reading without vignetting of photographic light.

[0005]

[Means for Solving the Problems] To explain one embodiment in conjunction with FIGS. 1 to 4, a camera having a magnetic head according to the invention of claim 1 has a feeding means 3 for feeding a film 22. , M2, a magnetic head 10 that records information in or reads information from a magnetic recording area 22a provided on the film 22 during film feeding, and an entry position (see Fig. 1(a)), and a pad 11 that can be switched to a retracted position (FIG. 1(b)) where it is retracted from the photographing optical path and presses the magnetic recording area 22a of the film 22 against the magnetic head 10 in the advanced position; Drive control means (control circuit 51, spring 32, cam 33, motor M1 and (consisting of gears G1 and G2), thereby solving the above problem. Further, in the camera having the magnetic head according to the invention of claim 2, the above-mentioned feeding means can be switched between an entry position where the magnetic head enters into the photographing optical path and a retracted position where the magnetic head is retracted from the photographic optical path. At least a magnetic head that records information in a magnetic recording area provided on the film as the film is fed or reads information from the magnetic recording area, and a pad that presses the magnetic recording area of the film against the magnetic head. The above-mentioned problem is solved by including drive control means that holds the magnetic head in the retracted position while the shutter is open and drives the magnetic head to the advanced position prior to operation of the magnetic head.

[0006]

[Operation] (1) The inventive pad 11 of claim 1 is located at an entry position where it enters into the photographing optical path (Fig. 1
(a)) and a retracted position (FIG. 1(b)) in which the camera is retracted from the photographing optical path. That is, pad 11
is provided, for example, at the bottom of the aperture 5 so as to be movable in the front-rear direction, thereby making it possible to shorten the lateral dimension of the camera. The drive control means holds the pad 11 at the retracted position at least while the shutter 9 is open. In this case, since the pad 11 is not present in the photographing optical path, the photographing light beam will not be vignetted. Here, since recording and reading by the magnetic head 10 are not performed when the shutter is open, there is no problem even if the pad 11 is retracted. Further, the drive control means includes the magnetic head 1
0, the pad 11 is driven to the entry position. This allows the magnetic head 10 to record information in the magnetic recording area 22a of the film 22 as the film is fed. (2) The magnetic head of the invention according to claim 2 is switchable between an entry position in which it enters into the photographing optical path and a retracted position in which it withdraws from the photographic optical path, and the drive control means is configured such that at least the shutter 9 is open. During this period, the magnetic head is held in the retracted position, and prior to operation of the magnetic head, the magnetic head is driven to the retracted position. This provides the same effect as described above.

[0007] In the section of the means and effects for solving the above-mentioned problems that explains the structure of the present invention, figures of embodiments are used to make the present invention easier to understand. It is not limited to.

[0008]

[Embodiment] An embodiment of the present invention will be explained with reference to FIGS. 1 to 4. Note that the same parts as in FIG. 5 are given the same reference numerals. Figure 2
3 is a perspective view from the rear of a camera having a magnetic head according to the present invention, and FIG. 3 is a side view in a central sectional view thereof. Inside the camera body 1, a cartridge chamber 2 in which a cartridge 21 is loaded is provided at one end, and a spool chamber 4 for storing a winding spool 3 is provided at the other end. 5 is provided. The camera body 1 also includes a magnetic head 10 for recording information below the aperture 5.
is fixedly provided, and a pad 11 is provided facing the magnetic head 10.

Here, since the magnetic head 10 and the pad 11 are provided below the aperture 5 as described above, the magnetic head 10 is placed between the aperture 5 and the cartridge chamber 2 as in the conventional case. Or aperture 5 and spool chamber 4
The lateral dimension of the camera can be shortened compared to the case where the camera is provided between the camera and the camera.

Patrone 2 loaded in cartridge chamber 2
The film 22 pulled out from the magnetic head 10 is passed between the magnetic head 10 and the pad 11, passes immediately after the aperture 5, and is wound around the winding spool 3. When the back cover (not shown) is closed, the upper and lower ends of the film 22 are pressed against the rails 1a and 1b by the pressure plate (provided on the back cover) 12 as shown in FIG. 3, and the film 22 maintains its flatness. In the hanging state, its central portion faces the aperture. Here, film 2
As shown in FIG. 2, a magnetic recording area 22a is provided at the bottom of the magnetic head 2, and the magnetic head 10 is brought into contact with this magnetic recording area 22a to record the information as described above. In addition, 6 is an outer cover that covers the camera body 1, 7 is a release button, and 8 in FIG.
9 is a photographing lens attached to the front of the camera body 1, and 9 is a lens shutter provided at the rear thereof.

Here, the pad 11 is moved by the drive mechanism shown in FIG. 1 in the front-rear direction of the camera between the position shown in FIG. 1(a) (entering position) and the retracted position shown in FIG. It is considered possible. At the entry position, the pad 11 presses the magnetic recording area 22a of the film 22 against the magnetic head 10, allowing the magnetic head 10 to perform magnetic recording. At this time, as shown by the solid line in FIG. A part of the pad 11 enters into the optical path L of the photographing light that passes through the aperture 5 and is guided to the film 22. On the other hand, in the retracted position, the pad 11 is retracted from the photographing optical path L as shown by the two-dot chain line in FIG. Magnetic recording by head 10 is impossible.

In FIG. 1, reference numeral 31 denotes a linear guide that supports the pad 11 so that it can move only in the front-back direction, and both ends of the spring 32 are attached to the protrusion 31a of the linear guide 31 and the protrusion 11a at the rear end of the pad 11. Each is hung. The pad 11 is always urged forward, that is, toward the magnetic head 10 side, by the urging force of the spring 32. 33
is a cam integrated with the gear G1, and the cam surface 33a of this cam 33 is capable of engaging with the protrusion 11b at the rear end of the pad 11. The gear G1 is meshed with a pinion gear G2 attached to the output shaft of the motor M1, and therefore, the rotation of the motor M1 causes the cam 33 to move through the gears G1 and G2.
rotates.

SW1 and SW2 are switches, and when the pad 11 is in the entry position (FIG. 1(a)), the cam 3
The switch SW1 is turned on by the lever 33b protruding from the pad 11 (at this time, the switch SW2 is turned off).
is in the retracted position (FIG. 1(b)), the pad 11
The protruding portion 11b turns on the switch SW2 (at this time, the switch SW1 is off).

FIG. 4 shows a control system, and the control circuit 51 includes the pad driving motor M1 and the hoisting motor M2.
A motor drive circuit 52 is connected thereto, and an exposure control circuit 53 that drives the shutter 9, a magnetic head 10, and a release switch SW3 that is turned on in conjunction with the operation of the above-mentioned switches SW1, SW2 and release button 7 are also connected. ing.

Next, the operation of the embodiment will be explained. Figure 1 (a
), the pad 11 presses the magnetic recording area 22a of the film 22 against the magnetic head 10 by the biasing force of the spring 32. In order to take a picture in this state, press release button 7.
When (FIG. 2) is pressed, the release switch SW3 is turned on, and accordingly, the control circuit 51 first rotates the motor M1 in the forward direction. The rotation of the motor M1 rotates the cam 33 in a counterclockwise direction via gears G2 and G1, so that the cam surface 33a of the cam 33 comes into contact with the protrusion 11b of the pad 11 and directs it toward the front of the camera. Press. Therefore, the pad 11 is guided by the straight guide 31 and the spring 32
The camera is driven forward against the urging force of.

When the position shown in FIG. 1(b) is reached, the switch SW2 is turned on, and in response, the control circuit 51 stops the motor M1 and opens the shutter 9. As a result, the subject light is transferred to the photographing lens 8 and the lens shutter 9.
Of this subject light, only the light that has passed through the aperture 5 reaches the film 22 and the film 22 is exposed. In this state, the pad 11 is evacuated from the optical path L of the photographing light passing through the aperture 5, as shown by the two-dot chain line in FIG.

When a predetermined shutter time has elapsed, the control circuit 51 closes the shutter 9 and reverses the motor M1, thereby causing the cam 33 to rotate through the gears G2 and G1.
is rotated in a clockwise direction. As a result, the cam surface 33a
Since the pad 11 is moved away from the rear part of the pad 11, the pad 11 is driven to the entry position shown in FIG.
Press the button to 0 to enable magnetic recording.

When this state is reached, the switch SW1 is turned on, and accordingly, the control circuit 51 stops the motor M1 and rotates the winding spool 3 by the winding motor M2, thereby loading one frame of the film 22. Start winding. At this time, the control circuit 51 drives the magnetic head 10, and the magnetic head 10 records information in the magnetic recording area 22a as the magnetic recording area 22a moves with the winding operation. Then, when the information recording is completed and the completion of winding of one frame of film is detected by a detection device (not shown),
Control circuit 51 stops hoisting motor M2.

In the configuration of the above embodiment, the hoisting motor M2 and the hoisting spool 3 serve as the feeding means, and the control circuit 51
, spring 32, cam 33, motor M1 and gears G1, G
2 constitute drive control means, respectively.

[0020] In the above, the pad is positioned at the retracted position only when the shutter is open, and is always held at the advanced position in other cases. However, for example, the pad may be moved to the advanced position only when performing magnetic recording However, in other cases, it may be held in the retracted position. That is, the magnetic head may be held at the retracted position at least while the shutter is open, and the magnetic head may be driven to the retracted position before the magnetic head is activated. Also, the magnetic recording area 22
The position of a is also not limited to the lower part of the film 22, and may be provided at the upper part of the film 22, for example.

Furthermore, although an example has been shown in which information is recorded by a magnetic head, the present invention can also be applied to a case where information is read from a magnetic recording area by a magnetic head. Furthermore, the content of the information to be recorded or read does not matter. It is also possible that the positional relationship between the magnetic head and the pad is opposite to each other (the magnetic head is on the front side of the camera and the pad is on the back side). In this case, the pad is fixed and the magnetic head is moved to the above-mentioned entry position The magnetic head may be held in the retracted position at least while the shutter is open, and the magnetic head may be driven to the retracted position before the magnetic head is activated.

[0022]

According to the invention as claimed in claim 1, the pad is switchable between an entry position where the pad enters into the photographing optical path and a retraction position where the pad is retracted, and which presses the magnetic recording area of the film against the magnetic head at the entry position. The pad is held in the retracted position at least while the shutter is open, and the pad is driven to the retracted position before the magnetic head is activated.
By placing it at the bottom of the camera, it is possible to shorten the lateral dimension of the camera and to perform magnetic recording or reading without vignetting the photographic light. According to the second aspect of the invention, the magnetic head is provided with a magnetic head that can be switched between an entry position for entering into the photographing optical path and a retraction position for retracting, and capable of magnetically recording the film in the entry position, and at least the shutter is open. Since the magnetic head is held at the retracted position while the magnetic head is moving, and the magnetic head is driven to the retracted position prior to the operation of the magnetic head, the same effect as described above can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a pad driving mechanism of a camera having a magnetic head according to an embodiment of the present invention.

FIG. 2 is a perspective view of the camera seen from the rear.

FIG. 3 is a side sectional view of the camera.

FIG. 4 is a block diagram of a control system.

FIG. 5 is a perspective view of a conventional camera.

[Explanation of symbols]

1 Camera body 2 Patrone room 3 Winding spool 4 Spool room 5 Aperture 7 Release button 10 Magnetic head 11 Pad 32 Spring 33 Cam 51 Control circuit 52 Motor drive circuit 53 Exposure control circuit G1, G2 Gear M1 Pad drive motor M2 Hoisting motor SW1, SW2 switch SW3 Release switch

Claims (2)

[Claims] 1. Feeding means for feeding a film, a magnetic head for recording information in a magnetic recording area provided on the film during the film feeding or reading information from the magnetic recording area, and a photographing optical path. the entry position into which the entry is made;
and a pad that can be switched to a retracted position for retracting from the photographing optical path, and that presses the magnetic recording area of the film against the magnetic head at the entering position, and a pad that is set to the retracted position at least while the shutter is open. A camera having a magnetic head, comprising drive control means for holding the pad and driving the pad to the entry position prior to actuation of the magnetic head. 2. A feeding means for feeding the film, which is switchable between an entry position where the film is entered into the photographing optical path and a retracted position where the film is withdrawn from the photographing optical path, and when the film is in the entry position, the film feeding means A magnetic head that records information in a magnetic recording area provided on the film as the film is being fed or reads information from the magnetic recording area, a pad that presses the magnetic recording area of the film against the magnetic head, and at least a shutter. A magnetic head characterized in that the magnetic head is provided with a drive control means that holds the magnetic head in the retracted position while the magnetic head is open and drives the magnetic head to the advanced position before operating the magnetic head. camera.