JP2855876B2 - Camera with magnetic head - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera capable of recording information (for example, trimming information) on a film by a magnetic head.

[0002]

2. Description of the Related Art In a camera of this type, when a magnetic head is brought into contact with a film to record information, the magnetic head is brought into contact with a magnetic recording area with an appropriate pressure.
It is necessary to provide a pad at a position facing the magnetic head with the film interposed therebetween, and press the magnetic recording area against the magnetic head with the pad.

In a high-temperature environment, the performance of the magnetic head may deteriorate, or the magnetic head may adhere to a film, so that information may not be accurately recorded. Therefore, in this case, it is desirable not to perform magnetic recording and not to press the magnetic head against the film. However, when the magnetic head and the pad are fixedly mounted in the camera body, the magnetic head is always used. Is pressed against the film, and erroneous information may be recorded in a high-temperature environment. Further, even in a high humidity environment, erroneous information may be recorded as described above due to deterioration of the performance of the magnetic head.

An object of the present invention is to provide a camera having a magnetic head that prevents erroneous information from being recorded.

[0005]

FIG. 1 (a) is a diagram corresponding to the claims. A camera having a magnetic head according to the first aspect of the present invention is a film feeding means for feeding a frame of a film 101 after photographing. 102 and the film 101
A magnetic head 103 for recording information in a magnetic recording area provided on the film with the advance of the frame,
The magnetic recording area of the film 101 with the magnetic head 1
03, and a pad 104 that can be switched to a retreat position to retreat from the film 101, and in an environment below a predetermined temperature, the pad 104 is switched to the protruding position prior to the operation of the magnetic head 103, and a predetermined temperature is maintained. Under the above environment, there is provided a switching control means 105 for switching and holding the pad 104 at the retracted position, thereby solving the above problem. As shown in FIG. 1B, the camera having the magnetic head according to the second aspect of the present invention includes the above-described film feeding means 102 and a projecting position which comes into contact with a magnetic recording area provided on the film 101. A magnetic head 203 for recording trimming information in the magnetic recording area in accordance with the film frame feed when in the protruding position, and a magnetic recording area for the film 101. The pad 204 pressed against the head and the magnetic head 20
A switching control means 205 for switching the magnetic head 203 to the protruding position prior to the operation of Step 3 and switching and holding the magnetic head 203 to the retracted position under an environment of a predetermined temperature or more, thereby solving the above-mentioned problem. I do. Further, the camera having the magnetic head according to the third aspect of the present invention has the structure shown in FIG.
(A) The film feeding means 102 shown in FIG.
03 and a pad 104, and the switching control means 105 is configured as follows. That is, the switching control unit 105 controls the magnetic head 20 under an environment of less than the predetermined humidity.
Prior to the operation of Step 3, the magnetic head 203 is switched to the projecting position, and in an environment of a predetermined humidity or more, the magnetic head 203 is switched and held at the retracted position. Still further, a camera having a magnetic head according to the invention of claim 4 is a camera having
(B) the film feeding means 102 and the magnetic head 2
03 and a pad 204, and the switching control means 205 is configured as follows. That is, the switching control means 205 controls the magnetic head 20 under an environment of less than the predetermined humidity.
Prior to the operation of Step 3, the magnetic head 203 is switched to the projecting position, and in an environment of a predetermined humidity or more, the magnetic head 203 is switched and held at the retracted position.

[0006]

(1) The switching control means 105 switches the pad 104 to the protruding position prior to the operation of the magnetic head 103 in an environment below a predetermined temperature. This enables the recording of the information. On the other hand, when the temperature around the camera exceeds a predetermined value, that is, when erroneous information may be recorded,
The pad 104 is switched and held at the retracted position. This prevents the magnetic head 103 from adhering to the film or recording incorrect information. (2) The switching control means 205 switches the magnetic head 203 to the projecting position prior to the operation of the magnetic head 203 in an environment below a predetermined temperature. This enables the recording of the information. On the other hand, if the temperature around the camera exceeds a predetermined value,
That is, when there is a possibility that erroneous information is recorded, the magnetic head 203 is switched and held at the retracted position. Thereby, the same effect as described above can be obtained. (3) The switching control means 105 switches the pad 104 to the protruding position prior to the operation of the magnetic head 103 in an environment where the humidity is lower than the predetermined humidity. This enables the recording of the information. On the other hand, when the humidity around the camera exceeds a predetermined value, that is, when there is a possibility that incorrect information is recorded,
The pad 104 is switched and held at the retracted position. Thereby, the same effect as described above can be obtained. (4) The switching control means 205 switches the magnetic head 203 to the projecting position prior to the operation of the magnetic head 203 in an environment where the humidity is lower than the predetermined humidity. This enables the recording of the information. On the other hand, if the humidity around the camera exceeds a predetermined value,
That is, when there is a possibility that erroneous information is recorded, the magnetic head 203 is switched and held at the retracted position. Thereby, the same effect as described above can be obtained.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a camera capable of trimming photographing will be described with reference to FIGS. The trimming photographing is to record information (trimming information) for printing only a predetermined area (trimming area) in the exposure area formed on the film by the shutter release, for example, in a recording area of the film. The trimming information is read by the laboratory, and based on the read information, only the trimming area is enlarged and printed. Since the trimming area is smaller than the print area obtained by normal shooting, by performing the trimming shooting, a photograph equivalent to zooming can be obtained even with a single focus lens.

FIG. 2 is a perspective view of the camera according to the present invention as viewed from the rear, and FIG. 3 is a side sectional view thereof. A main switch 41 and a release button 42 are provided on the upper surface of the camera body 1, and a momentary trimming switch 43, a display LED 44, and a temperature sensor 45 for detecting the temperature around the camera are provided. The trimming switch 43 is for instructing a switch between the trimming shooting mode for performing the above-described trimming shooting and the normal shooting mode for performing the normal shooting, and is always urged in the A direction by a spring (not shown), and is normally operated. It is in the off position shown. In the off position, the normal photographing mode is commanded. When the switch 43 is turned to the ON position in the direction B against the urging force of the spring, a trimming photographing mode is commanded. When the operation is stopped, the switch 43 returns to the off state by the urging force of the spring. The LED 44 is turned on only when the switch 43 is in the ON position.

In FIG. 2, the camera body 1 includes
A patrone chamber 2 in which a patrone 21 is loaded is provided at one end, and a spool chamber 4 for accommodating a hoisting spool 3 is provided at the other end, and an aperture 5 is provided therebetween. A magnetic head 10 for recording information is fixed below the aperture 5, and a pad 11 is mounted to face the magnetic head 10.

The patrone 2 loaded in the patrone chamber 2
The film 22 pulled out from 1 is passed between the magnetic head 10 and the pad 11, passes immediately after the aperture 5, and is wound on 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. The center is aperture
Facing Cha. Here, a magnetic recording area 22a is provided below the film 22, as shown, and the magnetic head 10 is brought into contact with the magnetic recording area 22a to record trimming information. Numeral 6 denotes an outer cover for covering the camera body 1, numeral 8 in FIG. 2 denotes a photographing lens, and numeral 9 denotes a lens shutter provided at a rear portion thereof.

Here, the pad 11 is moved by the driving mechanism shown in FIG. 4 in the longitudinal direction of the camera between a position (projection position) shown in FIG. 4 (a) and a retracted position shown in FIG. 4 (b). It is possible. At the protruding position, the pad 11 presses the magnetic recording area 22a of the film 22 against the magnetic head 10 to enable the magnetic recording by the magnetic head 10. At this time, as shown by a solid line in FIG. A part of the pad 11 protrudes into the optical path L of the photographing light passing through the aperture 5 and guided to the film 22. on the other hand,
In the retracted position, as shown by a two-dot chain line in FIG.
Is retracted from the photographing optical path L, but in this state, the magnetic recording area 22a of the film 22 is not pressed against the magnetic head 10, so that magnetic recording by the magnetic head 10 is impossible.

In FIG. 4, reference numeral 31 denotes a rectilinear guide for supporting the pad 11 so as to be movable only in the front-rear direction. Both ends of a spring 32 are attached to the protrusion 31a of the rectilinear 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 by the urging force of the spring 32. 33
Is a cam integrated with the gear G1, and the cam surface 33a of the cam 33 can be engaged 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, so that the rotation of the motor M1 causes the cam 33 to rotate through the gears G1 and G2.
Rotates.

SW1 and SW2 are pad position detecting switches. When the pad 11 is in the protruding position (FIG. 4A), the switch SW1 is turned on by the lever 33b protruding from the cam 33 (at this time, the switch SW2). Is off), and when the pad 11 is in the retracted position (FIG. 4B), the switch SW2 is operated by the rear end 11b of the pad 11.
Is turned on (at this time, the switch SW1 is turned off).

FIG. 5 shows a control system. The control circuit 51 includes the pad driving motor M1 and the hoisting motor M2.
And an exposure control circuit 53 that drives the shutter 9, a magnetic head 10, and a display LED 44. Further, the pad position detection switches SW1 and SW2, the release button 4
Release switch SW5 that turns on in conjunction with the operation of step 2.
The main switch 41, the trimming switch 43 and the temperature sensor 45 are also connected to the control circuit 51, and the temperature sensor 4
5 and the ON / OFF state of each switch are input to the control circuit 51.

Next, the control procedure by the control circuit 51 will be described with reference to the flowcharts of FIGS. When the main switch 41 is turned on, the program is started. When it is determined in step S101 that the main switch 41 is turned on, the process proceeds to step S201. Step S201
Then, the temperature X around the camera detected by the temperature sensor 45 is read, and it is determined whether or not the temperature is equal to or more than a predetermined value X1.

In step S102, the on / off state of the trimming switch 43 is determined. If it is determined that the trimming switch 43 has been operated to the on position, the LED 44
Is turned on and the trimming shooting mode is set, and the flow advances to step S103 to determine the state of the release switch SW5. If the release switch SW5 is off, the process returns to step S101; if it is on, step S104.
Proceed to.

In step S104, it is determined from the state of the switch SW1 whether or not the pad 11 is at the projecting position.
If the switch SW1 is off, it is determined that it is not at the projecting position, that is, it is at the retracted position, and the process proceeds to step S106.
If the switch SW1 is on, it is determined that the pad 11 is at the projecting position, and the process proceeds to step S105, where the pad 11 is switched to the retracted position.

That is, the control circuit 51 rotates the motor M1 in a predetermined direction via the motor drive circuit 52,
2. The cam 33 is rotated counterclockwise through G1. As a result, the cam surface 33a of the cam 33 comes into contact with the rear end of the pad 11 and presses it toward the rear of the camera. Therefore, the pad 11 is guided by the linear guide 31 and resists the urging force of the spring 32. Driven behind the camera. When the pad 11 reaches the retracted position shown in FIG. 4B, the switch SW2 is turned on, and in response to this, the control circuit 5
1 stops the motor M1.

Next, in step S106, the shutter 9 is driven via the exposure control circuit 53 to perform photographing. Here, when the shutter 9 is opened, the subject light passes through the zoom lens 8 and the lens shutter 9 and is guided into the camera body 1, and only the light that has passed through the aperture 5 of the subject light reaches the film 22. The film 22 is exposed. In this state, as shown in FIG. 3, since the pad 11 is retracted from the optical path L of the photographing light passing through the aperture 5, this photographing light does not vignet on the pad 11.

After the photographing, in step S107, the pad 11 is driven to the projecting position. That is, the motor M1 is reversed, and the cam 33 rotates in the counterclockwise direction via the gears G2 and G1. As a result, since the cam surface 33a is separated from the rear portion of the pad 11, the pad 11 is driven to the projecting position shown in FIG.
The second magnetic recording area 22a is pressed against the magnetic head 10 to be in a magnetically recordable state. In this state, the switch SW1 is turned on, and accordingly, the control circuit 51 stops the motor M1.

Next, in step S108, the hoisting spool 3 is rotated by the hoisting motor M2, thereby starting to wind up one frame of the film 22, and in step S109, the magnetic head 10 is driven, and the magnetic force associated with the hoisting operation is performed. As the recording area 22a moves, the magnetic head 10 records trimming information in the magnetic recording area 22a. After the information recording is completed, when the completion of winding of one frame of the film is detected by a detecting device (not shown), the winding motor M2 is stopped in step S110, and the process returns to step S101.

If it is determined in step S102 that the trimming switch 43 is at the off position,
The ED 44 is turned off, the normal shooting mode is set, and the process proceeds to step S111 in FIG. If it is determined in step S111 that the pad 11 is in the protruding position (the switch SW2 is on), in step S112, the pad 1
1 is driven to the retreat position, and the process proceeds to step S113. If the pad 11 is at the retreat position, the process directly proceeds to step S113.

In step S113, the release switch SW
If 5 is determined to be off, the process returns to step S101; if determined to be on, the process proceeds to step S114. Step S1
At 14, the shutter 9 is driven to perform photographing, and then at step S115, the film 22 is wound up by one frame, and the process returns to step S101.

On the other hand, in step S201, the temperature sensor 45
Is determined to be equal to or higher than the predetermined value X1,
The process proceeds to step S202 in FIG. In step S202, the LED 44 is turned off, and then in step S203, it is determined whether the switch SW1 is on. If the switch SW1 is off, it is determined that the pad 11 is at the retreat position, and the process proceeds to step S113. If the switch SW1 is on, it is determined that the pad 11 is at the protruding position and the pad 11 is driven to the retreat position. Proceed to step S112.

According to the above procedure, when the temperature X around the camera is less than the predetermined value X1 when the trimming photographing mode is set, the pad 11 is switched to the projecting position after photographing, and the trimming information is recorded by the magnetic head 10. You. When the temperature X around the camera is equal to or higher than the predetermined value X1 (when there is a possibility that erroneous information may be recorded by the magnetic head 10), the pad 11 is forcibly switched to the retracted position and held temporarily. Even if the switch 43 is turned on, the LED 44 does not light up and the operation of the magnetic head 10, that is, the trimming photographing is prohibited. Therefore, erroneous trimming information is not recorded in a high-temperature environment, and an undesirable photograph is prevented.

In the above embodiment, the hoist motor M2 constitutes the film feeding means 102, and the temperature sensor 45, the control circuit 51, the motor M1, the cam 33 and the spring 32 constitute the switching control means 105.

In the above description, the pad 11 is switched to the projecting position only when the film frame is fed, that is, when the trimming information is recorded. However, even when the pad 11 is in the projecting position, the pad 11 does not enter the photographing optical path. Then, when the trimming shooting mode is set and the temperature X is lower than the predetermined value, the pad 11 may always be held at the projecting position.

In the above, the case where the trimming information is magnetically recorded on the film has been described. Another embodiment in which the photographed information is recorded instead of the trimming information will be described below. The photographed information is information indicating that photographing of the frame has been completed. This information is necessary when the film that has been photographed halfway is once rewound and then used again. That is, when the film is loaded again, the photographed information is read while the film is being wound, and when the frame in which the photographed information is not recorded is detected, the winding is stopped. The photographing can be resumed from the frame, so that the film is prevented from being wasted due to multiple exposure of the photographed frame and excessive winding.

FIG. 8 is a flowchart showing a control procedure in this embodiment. Steps similar to those in FIG. 6 described above are denoted by the same reference numerals. In FIG. 8, when it is determined that the main switch 41 is turned on in step S101, the process proceeds to step S201 in the same manner as described above, and it is determined whether the temperature X around the camera detected by the temperature sensor 45 is equal to or more than a predetermined value X1, If it is determined that the value is less than the predetermined value X1, the process proceeds to step S103. If it is determined in step S103 that the release switch SW5 is off, the process returns to step S101. If it is determined that the release switch SW5 is on, the above-described steps S106 to S106 are performed.
The process of step 108 is performed, and then, in step S301, the photographed information for the frame is recorded. Thereafter, when the winding of one frame is completed, the hoist motor M2 is stopped in step S110, and the process returns to step S101.

On the other hand, if it is determined in step S201 that the temperature X is equal to or higher than the predetermined value X1, the process proceeds to step S302. If it is determined that the switch SW1 is off, that is, if the pad 11 is in the retracted position, Step S3
Go to 04. When the switch SW1 is determined to be on,
That is, when it is determined that the pad 11 is at the projecting position, the pad 11 is driven to the retracted position in step S303, and the process proceeds to step S304. In step S304,
The shutter release is prohibited, and then, in step S101
Return to

According to the above procedure, the temperature X around the camera
Is greater than or equal to the predetermined value X1, the pad 11 is forcibly held at the evacuation position, and the photographing is prohibited even if the release button is operated at this time. Then, when the temperature X becomes less than the predetermined value X1, shooting is performed in accordance with the operation of the release button, and thereafter, recording of the shot information by the magnetic head 10 is performed together with the film frame advance. Therefore, erroneous photographed information is not recorded in a high-temperature environment, and when the film is once rewound and used again, multiple exposure and waste of the film are prevented.

FIG. 9 shows a modification of the pad driving mechanism, and the same reference numerals are given to the same portions as those in FIG. In this example, a wire (hereinafter, a shape memory wire) 61 made of a shape memory alloy is used as an actuator instead of the motor M1 and the cam 33 described above. One end of the shape memory wire 61 is fixed to a part of the camera body 1, and the other end is fixed to a rear end of the pad 11. Then, lead wires 62 connected to both ends of the shape memory wire 61
When power is supplied to the a and 62b, the wire 61 contracts, and the pad 11 is driven to the retracted position shown in FIG. 9B against the urging force of the spring 32. Also, the lead wires 62a, 62
When the power supply to b is cut off, the shape memory wire 61 is extended to the original state by the urging force of the spring 32, and the pad 11 is driven to the projecting position shown in FIG. .

If the shape memory wire 61 has a property of contracting in a high temperature environment of a predetermined value or more, a temperature sensor becomes unnecessary. That is, when the environmental temperature becomes a predetermined value or more and the shape memory wire 61 contracts in the state of FIG. 9A, the pad 11 is driven to the retracted position side, and the switch SW1 is turned off from on. When the switch SW1 is turned off, no recording is performed.

Here, as described above, there is a possibility that erroneous information may be recorded due to deterioration of the performance of the magnetic head 10 even in an environment where the humidity is equal to or higher than the predetermined humidity. In the environment described above, the pad 11 is switched to the protruding position prior to the operation of the magnetic head 10, and the pad 11 is switched to the retracted position in an environment of a predetermined humidity or more, thereby preventing erroneous information recording. You may.

It is also conceivable 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 rear side). In this case, the pad is fixed and the magnetic head is moved to the above projecting position. And the retracted position, the pad 11 is switched to the protruding position prior to the operation of the magnetic head 10 in an environment lower than a predetermined temperature (humidity), and the pad 11 is moved in an environment higher than the predetermined temperature (humidity). May be switched to the retracted position. Further, the position of the magnetic recording area 22a is not limited to the lower part of the film 22, but may be provided, for example, on the upper part of the film 22.

[0036]

According to the first aspect of the present invention, the pad is switched to the protruding position prior to the operation of the magnetic head in an environment lower than the predetermined temperature, and the pad is switched to the retracted position in an environment higher than the predetermined temperature. Therefore, in a high-temperature environment where the performance of the magnetic head is degraded or the magnetic head may adhere to the film, the magnetic head is not pressed against the film, thereby preventing erroneous information recording. According to the second aspect of the present invention, the magnetic head is switched to the protruding position prior to the operation of the magnetic head in an environment lower than the predetermined temperature, and the magnetic head is switched to the retracted position in an environment higher than the predetermined temperature. Therefore, the same effect as described above can be obtained. Further, according to the third aspect of the present invention, the pad is switched to the protruding position prior to the operation of the magnetic head in an environment lower than the predetermined humidity, and the pad is switched and held in the retracted position in an environment higher than the predetermined humidity. So
It is possible to prevent erroneous recording of information in a high humidity environment. Furthermore, according to the invention of claim 4, the magnetic head is switched to the protruding position prior to the operation of the magnetic head in an environment below a predetermined humidity, and the magnetic head is switched to the retracted position in an environment above the predetermined humidity. Since the holding is performed, the same effect as described above can be obtained.

[Brief description of the drawings]

FIG. 1 is a diagram corresponding to claims.

FIG. 2 is a perspective view of the camera according to the embodiment of the present invention as viewed from the rear.

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

FIG. 4 is a diagram illustrating an example of a pad driving mechanism.

FIG. 5 is a block diagram of a control system.

FIG. 6 is a flowchart of a processing procedure.

FIG. 7 is a flowchart following FIG. 6;

FIG. 8 is a flowchart showing another embodiment.

FIG. 9 is a view showing a modified example of a pad driving mechanism.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 camera body 8 shooting lens 9 lens shutter 10 magnetic head 11 pad 22 film 22 a magnetic recording area 32 spring 33 cam 41 main switch 42 release button 43 trimming switch 44 LED 45 temperature sensor 51 control circuit 52 motor drive circuit 61 shape memory wire 101 Film 102 Film feeding means 103, 203 Magnetic head 104, 204 Pad 105, 205 Switching control means M1 motor M2 hoisting motor

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G03B 31/00 G03B 17/24

Claims (4)

(57) [Claims] 1. A film feeding means for feeding a film after filming, a magnetic head for recording information in a magnetic recording area provided on the film in accordance with the film feeding, and a film sandwiching the film. A pad capable of switching a magnetic recording area of the film to a protruding position for pressing the magnetic head, and a retreat position for retreating from the film; and in an environment below a predetermined temperature, the pad is moved before the operation of the magnetic head. A camera having a magnetic head, comprising: switching control means for switching to a projecting position and switching and holding the pad to the retracted position under an environment of a predetermined temperature or higher. 2. A film feeding means for feeding a film after filming, a projecting position contacting a magnetic recording area provided on the film, and a retracting position retracting from the magnetic recording area. A magnetic head for recording information in the magnetic recording area in accordance with the film frame advance when in the projecting position; a pad for pressing the magnetic recording area of the film against the magnetic head; And switching control means for switching the magnetic head to the protruding position prior to the operation of the magnetic head, and for switching and holding the magnetic head to the retracted position under an environment of a predetermined temperature or higher. Having a magnetic head. 3. A film feeding means for feeding a film frame after photographing, a magnetic head for recording information in a magnetic recording area provided on the film in accordance with the film frame feeding, and a film head sandwiching the film. A pad capable of switching a magnetic recording area of the film to the magnetic head and a switchable position to a retreat position for retreating from the film, and in an environment of less than a predetermined humidity, the pad is moved before the operation of the magnetic head. A camera having a magnetic head, comprising: switching control means for switching to a projecting position and switching and holding the pad to the retracted position under an environment of a predetermined humidity or more. 4. A film feeding means for feeding a film after filming, a projecting position contacting a magnetic recording area provided on the film, and a retracting position retracting from the magnetic recording area. A magnetic head for recording information in the magnetic recording area in accordance with the film frame feed when in the projecting position; a pad for pressing the magnetic recording area of the film against the magnetic head; And switching control means for switching the magnetic head to the protruding position prior to the operation of the magnetic head and for switching and holding the magnetic head to the retracted position under an environment of a predetermined humidity or more. Having a magnetic head.