JPH0553188A - Camera - Google Patents

Abstract

PURPOSE:To prevent the deformation of a film and the deterioration of a head caused by the defective feeding of the film by providing a means for retreating a magnetic head from a film surface in the case of detecting the defective feeding of the film. CONSTITUTION:As to this camera provided with a feeding motor for taking up and rewinding the film and a magnetic head 5 for writing and reading information with reference to the aforesaid magnetic recording part, this camera is provided with a head retreating means constituted of a lever 6, oblong hole parts 6a and 6b, projecting parts 6c and 6d, an erect part 6e, pins 7 and 8, a spring 9, a lever 11, oblong hole parts 11a and 11b, pins 12 and 13, a worm gear 14, a motor 15 and a head retreating means driving circuit 29 in order to accomplish a 1st state where the magnetic head 5 is made to abut on the film surface, or a 2nd state where the magnetic head 5 is retreated from the film surface, a defective film feeding detection circuit 31 for detecting the defective feeding of the film by the feeding motor 32 and a controlling means for switching the head retreating means to the 2nd state in the case that the defective feeding of the film is detected by the defective film feeding detection circuit 31.

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 recording / reproducing means for a loaded film having a magnetic recording portion.

[0002]

2. Description of the Related Art Hitherto, there has been proposed a camera using a film with a magnetic storage portion, which is provided with a film feeding failure detecting means for detecting a film feeding failure. This is to rewind the film and write or read information again when the film feeding failure detection means detects the film feeding failure.

Further, in a camera provided with a speed detecting means for detecting a film feeding speed, when it is judged that the detected film feeding speed is slower than a predetermined speed, the operation of the camera is prohibited. A configuration including means is also proposed.

[0004]

However, in the case of the above-mentioned prior art, in the former case, the defective film feeding is often caused by the tension of the film or the breakage of the film, which makes it impossible to rewind the film. In many cases. Therefore, the camera becomes inoperable with the magnetic head in contact with the film surface. If the camera is left in this state, the film may be deformed by the magnetic head, the contact surface of the magnetic head may get wet, the film may deteriorate, or part of the film surface may adhere to the head. However, there is a drawback that the film and head cannot be reused.

In the latter case, when the film feeding speed is slower than a predetermined speed, the operation is prohibited as it is, and the magnetic head remains in contact with the film surface.
It has the same drawbacks as the former.

SUMMARY OF THE INVENTION An object of the present invention is to provide a camera capable of preventing film deformation and head deterioration due to defective film feeding, in view of the above-mentioned conventional circumstances. ..

[0007]

In order to achieve the above-mentioned object, the present invention provides a feeding motor for winding and rewinding a film having a magnetic recording portion, and information for the magnetic recording portion. In a camera having a magnetic head for writing and reading data, a head retracting means capable of realizing a first state in which the magnetic head is in contact with a film surface or a second state in which the magnetic head is retracted from the film surface. A film feeding defect detecting means for detecting a defective film feeding by the feeding motor, and a control means for switching the head retracting means to the second state when the defective film feeding is detected by the means. And is set.

[0008]

According to the above-mentioned means, when the defective film feeding is detected by the defective film feeding detecting means, the magnetic head is retracted from the film surface by the head retracting means, and then the camera is made inoperative. .. Therefore,
The magnetic head will not be left in contact with the film surface for a long time, and deformation of the film and deterioration of the head can be prevented.

[0009]

Embodiment 1 FIG. 1 is a block diagram showing an electric system of a camera according to the present invention, and FIG. 2 is a perspective view showing a structure of a main part of the camera according to the present invention. 3 and 4 are flowcharts showing the processing of the camera according to the present invention.

First, the configuration of FIG. 2 will be described. In the figure, reference numeral 1 denotes a film cartridge, which accommodates all of the film 2 provided with a magnetic recording portion (not shown) and a perforation 2a (until the start of auto loading). The film cartridge 1 is inserted into a cartridge chamber (not shown) of the camera. 4 is a film pressing pad made of an elastic material such as rubber, and 5 is information read in the magnetic recording portion of the film 2 (for example, ISO information, film frame number information, etc.), and information is recorded in this magnetic recording portion. Is a magnetic head for writing.

Reference numeral 6 is a standing portion 6e for holding the magnetic head 5,
A lever having elongated holes 6a and 6b slidably fitted to pins 7 and 8 provided on the main body side and protrusions 6c and 6d, respectively. The other end of the protrusion 6c is a fixing member 10 on the main body side.
It is hooked by a spring 9 attached to the film 2, and is always urged in the surface direction of the film 2. Reference numeral 11 denotes a rack which meshes with elongated holes 11a and 11b slidably fitted to pins 12 and 13 provided on the camera body side, a protrusion 11c with which the abutting portion 6d of the lever 6 abuts, and a worm gear described later. A lever having a portion 11d, 14 is a worm gear fixed to the output shaft of the motor 15 and transmitting the output to the lever 11, and the magnetic head 5 is connected to the film 2 via the levers 6 and 11 by the forward rotation of the motor 15. Move in the plane direction. Reference numeral 4 denotes a film pressing pad made of an elastic material such as rubber. The contact surface with the film 2 is as smooth and smooth as possible, and is fixed to the camera body. Reference numeral 16 is a taking lens, and 17 is a film winding spool.

A roller member 18 is attached to a camera body (not shown) so that the roller portion 18a contacts the film 2 and is rotated by feeding the film 2. 19
Is a pulse substrate fixed to the fixing portion 18b of the roller member 18 and rotating integrally with the roller member 18.
9b and the non-conducting part 19a. Reference numerals 20 and 21 are contact pieces attached to the camera body (not shown), and are the pulse board 1
By detecting the number of revolutions of 9 for a predetermined time by the contact pieces 20 and 21, the film feed amount is detected by a circuit described later.

Next, the structure of the circuit block shown in FIG. 1 will be described.

In the figure, reference numeral 22 denotes a control circuit which is constituted by a microcomputer or the like and generalizes various controls of the camera, and the following members are connected to the control circuit 22. Reference numeral 23 is a film feeding motor drive circuit for driving the film feeding motor 32, and 24 is an AF / A for controlling the focusing of the photographing lens and the operation of the exposure control shutter.
An E control circuit 25 is a switch which is turned on by the first stroke of the release button, and when the switch 25 is turned on, release of the camera is started.

Reference numeral 26 is turned on when the film cartridge 1 containing the film 2 is loaded into the camera.
The cartridge loading switch 27 is a back cover switch that is turned on when the back cover is closed. These switches 26 and 27 are connected in series, and when both switches are turned ON, a signal to that effect is input to the control circuit 22, and the control circuit 22 receives the signal to input the film feed motor drive circuit 23 and the film. Through the feeding motor 32, the cueing operation (film idling operation) to the first frame of the film 2 is started. Reference numeral 28 denotes a magnetic head drive circuit that controls writing and reading operations of the magnetic head 5.
Reference numeral 9 is a head retracting means drive circuit for driving a head retracting means for switching the magnetic head between a first state in which it is in contact with the film 2 surface and a second state in which it is retracted from the film 2 surface, and 30 is a pulse plate 19 and a contact piece. A film feed amount detection circuit for detecting the film feed amount based on the number of revolutions of the pulse plate 19 detected by 20, 21 and 31, a film feed amount detection means 3
With the signal from 0, the film feeding speed is detected by detecting the film feeding amount for a predetermined time, and by comparing this film feeding speed with the predetermined feeding speed,
A film feeding failure detection circuit for detecting a film feeding failure.

Next, the operation of the control circuit 22 will be described with reference to FIG.
4 and the flow chart of FIG. 4 (processing subsequent to FIG. 3).

When the film cartridge 1 is loaded in the camera, the cartridge loading switch 26 is turned on, and it is determined that the loading is completed (S101). Further, when it is detected that the back cover is closed and the back cover switch 27 is turned on, the film feeding motor drive circuit 23 and the film feeding motor (not shown) cause the first frame of the film 2 to move to the camera. The film is wound so as to come to the aperture position (S102). Next, the film feed amount detection circuit 30 determines whether or not a predetermined amount of film has been fed (S103). Here, the predetermined feeding amount is a feeding amount required until the leading end of the film is wound around the film winding spool 17 of the camera. At this time, the magnetic head 5 is driven by the head retracting means drive circuit 2
Since it is in the second state of being retracted from the surface of the film 2 by 9, the leading end of the film 2 is pushed out from the cartridge 1 and is not caught by the magnetic head 5 in the course of winding the film winding spool 17.

When it is determined in step 103 that a predetermined amount of film has been fed, the head retracting means drive circuit 29
The motor 15 rotates forward for a predetermined time (S104). When the motor 15 rotates in the forward direction, the lever 11 moves in the direction of the film 2 via the worm gear 14 shown in FIG. 2, and the position regulation by the protruding portion 11C of the lever 11 is released accordingly. The lever 6 also moves in the direction of the film 2 in accordance with the depression of 9 and eventually the magnetic head 5 fixed to the standing portion 6e is pressed against the surface of the film 2. The moving stroke of the lever 6 at this time is larger than the moving stroke of the lever 11. Needless to say, this is to ensure that the magnetic head 5 and the film 2 surface are pressed against the film pressing pad 4.

During the film feeding process, the film feeding amount detection circuit 30 outputs a signal corresponding to the feeding amount. The film feeding failure detection circuit 31 detects the film feeding speed V (S105). The film feeding speed V and the limit speed V _{1 at} which information can be stably read by the magnetic head 5 are compared by the control circuit 22 (S106), and if there is a relationship of V ≧ V ₁ , step 1
10. If there is a relationship of V <V ₁ , go to step 1
Proceed to 07.

When V <V ₁ , the head retracting means driving circuit 29 reversely rotates the motor 15 for a predetermined time (S107). As the motor 15 rotates in the reverse direction,
The lever 11 moves in the direction away from the surface of the film 2 via the worm gear 14 shown in FIG. 1, and accordingly, the protrusion 6d of the lever 6 is pushed by the protrusion 11c of the lever 11, so that the spring 9 is not biased. The magnetic head 5 withdraws from the surface of the film 2 in due course. Then, the film feeding motor drive circuit 23 stops the film feeding motor 32 (S10).
8) Then, a series of operations of the camera are stopped to make them inoperative (S109).

On the other hand, in the case of V ≧ V ₁ , the magnetic head drive circuit 28 is driven to drive the magnetic head 5 to record film information previously recorded in the magnetic recording portion of the film 2 (for example, ISO sensitivity, number of film frames). , Exposed information, etc.)
Is read (S110) and stored. Further, the film feed amount detection circuit 30 determines whether or not the predetermined feed amount, that is, the first frame or the aperture position of the camera has been reached (S111).
Return to 3. If the first frame is at the aperture position, the film feeding motor drive circuit 23 stops the film feeding motor 32 (S112). Then, step 1
The same operation as in 07 is performed to retract the magnetic head 5 from the film 2 surface (S113).

Further, it is determined whether the release of the camera is pushed or not by the state of the switch 25 (S114).
If the release is ON, the AF / AE control circuit 24 is driven to perform the photographing operation such as the focusing operation of the photographing lens 16 and the exposure operation by opening and closing the shutter suitable for the ISO sensitivity read in step 110 (S115). ). Then,
It is determined whether or not there are remaining frames on the film 2 (S11).
6). Further, the rewinding of the film 2 is started via the film feeding motor drive circuit 23 and the film feeding motor 32 (S117). Next, it is judged whether or not the rewinding of the film 2 into the film cartridge 1 is completed (S1
18), if completed, film feed motor drive circuit 2
The film feeding motor 32 is stopped by driving 3 (S119).

On the other hand, when there is a remaining frame on the film 2, the film feeding motor drive circuit 23 is driven to drive the film feeding motor 32 to start winding one frame of the film 2 (S120). Here, the same operation as step 104 is performed (S121), and the magnetic head 5 is moved to the film 2
Abut the surface. Furthermore, the same operation as step 105 is executed (S122), and then V
And V ₁ are compared (S123), and if V <V ₁ , the process returns to step 107. On the other hand, when V ≧ V ₁ , the magnetic head drive circuit 28 is driven to drive the magnetic head 5
Thus, the shutter time, exposed information, and the like are written (or information is read if necessary) in the magnetic recording portion of the film 2 (S124). Further, the film feed amount detection circuit 30 determines whether or not the feed amount required until the next frame to be photographed comes to the aperture position of the camera has been fed (S125), and the required feed amount is fed. If sent, the process returns to step 112 to re-execute the subsequent processes, and if denied, returns to step 122 to execute the subsequent processes.

[0024]

Second Embodiment FIG. 5 is a block diagram showing another example of the electric system of the second embodiment of the present invention. FIG. 6 is a perspective view showing another example of the structure of the main part of the second embodiment of the present invention. In FIGS. 5 and 6, the same reference numerals are used for the same components as those in FIGS. 1 and 2, and redundant description will be omitted below.

The difference between this embodiment and the above embodiment is the method of detecting the film feed amount. In the figure, reference numeral 50 denotes a photo reflector which is arranged at a position where the perforations 2a of the film 2 pass and which detects a feeding state of the film,
Reference numeral 51 is a photoreflector drive circuit for driving the photoreflector 50, 52 is a film feed amount detection circuit for detecting the film feed amount by counting the signals from the photoreflector 50, and 53 is the film feed unit of FIG. This is the same film feeding failure detection circuit as the failure detection circuit 31. The flow chart showing the operation of this configuration is the same as that of the flow chart (FIGS. 3 and 4) of the first embodiment, and therefore its explanation is omitted.

[0026]

Third Embodiment FIG. 7 is a flowchart showing the processing of the third embodiment of the present invention. In FIG. 7, steps that perform the same operations as in FIG. 4 are omitted and only the steps before and after the added processing (steps 201 and 202) are shown. The timer T is a timer provided in the control circuit 22 and is set to be slightly longer than the time required to wind one frame, and is executed after the winding start process (S120) (S20).
1). This is a known timer used in a conventional camera to detect that the film has stretched for some reason. Further, it is judged whether or not the timer T has timed out before the film feeding is completed for one frame (S202).
Returning to step 107, on the other hand, if the time is not over, the process proceeds to step 125.

In the above embodiment, the warning means when a defective film feeding is detected is not particularly described, but it is possible to use the conventionally known warning means as it is.

[0028]

As described above, according to the present invention, a feeding motor that winds and rewinds a film having a magnetic recording portion, and a magnetic motor that writes and reads information to and from the magnetic recording portion. In a camera provided with a head, a head retracting means capable of implementing a first state in which the magnetic head is brought into contact with the film surface or a second state in which the magnetic head is retracted from the film surface, and the feeding motor are provided. A film feeding defect detecting means for detecting a defective film feeding, and the head retracting means for detecting the defective film feeding by the second means.
Since the magnetic head is not left in contact with the film surface for a long time, the film can be prevented from being deformed and the head from being deteriorated.

[Brief description of drawings]

FIG. 1 is a block diagram showing an electric system of a camera of the present invention.

FIG. 2 is a perspective view showing a configuration of a main part of the camera of the present invention.

FIG. 3 is a flowchart showing a processing example of a camera according to the present invention.

FIG. 4 is a flowchart showing a process that follows the process of FIG.

FIG. 5 is a block diagram showing another example of the electric system of the second embodiment of the present invention.

FIG. 6 is a perspective view showing another example of the configuration of the main part of the second embodiment of the present invention.

FIG. 7 is a flowchart showing a process of a third embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 film cartridge 2 film 5 magnetic head 18 roller member 19 pulse board 20, 21 contact piece 22 control circuit 23 film feeding motor drive circuit 28 magnetic head drive circuit 29 head retraction means drive circuit 30 film feed amount detection circuit 31 film feed Feeding failure detection circuit 32 Feeding motor

Claims (1)

[Claims] 1. A camera comprising a feeding motor for winding and rewinding a film on which a magnetic recording portion is formed, and a magnetic head for writing and reading information to and from the magnetic recording portion. A head retracting means capable of realizing a first state in which the head is brought into contact with the film surface or a second state in which the magnetic head is retracted from the film surface, and a film for detecting a defective film feeding by the feeding motor. A camera provided with a feeding failure detection means and a control means for switching the head retracting means to the second state when the means detects a film feeding failure.