JP2788975B2 - Camera magnetic recording and playback device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a magnetic recording / reproducing of a camera for recording various information on a film coated with a magnetic material or reproducing the information recorded on the film. It concerns the device.

[Prior Art] Conventionally, a magnetic head is always kept in contact with a film in order to read information on the film or write information on the film. There is a problem that recording and reproduction cannot be performed accurately. For this reason, a method of contacting a magnetic head with a film only when necessary has been considered. That is, for example, a method of touching the head in conjunction with a first stroke by pressing a release button for taking an image, or a means for operating an actuator such as a solenoid when necessary is employed.

[Problems to be Solved by the Invention] However, such a conventional method of head touching in conjunction with the first stroke of the release button of the magnetic recording / reproducing apparatus requires an extra load when pressing this button, and a light touch. And could not be pressed, resulting in poor operability. Further, providing a means for operating an actuator such as a solenoid is disadvantageous in that it is uneconomical and the camera cannot be miniaturized.

[Means for Solving the Problems] In order to solve such problems, a magnetic recording / reproducing apparatus for a camera according to the present invention includes a head driving unit for abutting or retracting a magnetic head on a film, The camera includes a setting unit that moves to the position of the two photographing states and determines whether or not photographing is possible, and a setting position information transmission unit that moves the head driving unit according to the position of the setting unit.

[Operation] The magnetic head is brought into contact with or retracted from the film in accordance with the state position of the setting section, and as a result, the magnetic head can be brought into contact with the film as necessary to record information.

Example Next, the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view showing one embodiment of a magnetic recording / reproducing apparatus for a camera according to the present invention. This figure particularly shows the relationship between the lens barrel and the magnetic head. In the figure,
F is a film which is pulled out from the cartridge P and wound on a spool S. Reference numeral 1 denotes a magnetic head which records information (exposure information, trimming information, photographing date and time, etc.) corresponding to a photographed frame 13 on a magnetic portion 14 provided in advance on the film F or an ISO previously recorded on the film F. The information and the number-of-frames information are reproduced. Reference numeral 2 denotes a lever that fixes the magnetic head 1 and swings so that the magnetic head 1 comes into contact with or retracts from the film F, 3 denotes a pin fixed to the lever 2, and 4 denotes one end 4a of a lens barrel. The head drive lever 5 which is in contact with a part, 5 is the drive lever 4
Is a torsion spring for urging the lever 2 and the lever 4 toward each other.
A pressure pad described later is provided at a position facing the magnetic head 1 with the film F interposed therebetween.

Reference numeral 7 denotes a lens barrel (setting unit) which has a two-group type zoom lens configuration in the present embodiment. However, this lens may be a single focus type or a bifocal type. The lens barrel 7 has a cam 7 for driving the second group lens.
a, 7b are provided, and a gear portion 7c is provided for driving these, which is engaged with a gear 11 connected to a motor described later. Further, step cams 7d, 7e, 7f are provided at positions where they contact the drive lever 4. Reference numeral 8 denotes a first group lens chamber of the zoom lens, and a pin 9 partially provided therein.
Is guided by the cam 7a of the lens barrel 7, and the lens of the first group moves. Reference numeral 12 denotes a photo interrupter which detects a perforation or the like on the film F and detects a moving amount of the film F.

FIG. 2 is a conceptual diagram illustrating the concept of the present invention. The film detecting means 101 detects the presence or absence of the film F, and the back cover detecting means 103 detects the open / close state of the back cover. Further, the frame number detecting means 102 determines the feed amount of one frame and adds or subtracts the sent amount. Then, based on the information, the control means 10
4 operates the film feeding means 105 and the lens driving means 106 in association with each other, and the recording / reproducing means 107 exchanges information with the film F.

FIG. 3 is a configuration diagram showing one embodiment of a circuit configuration of the magnetic recording / reproducing apparatus of the camera of the present invention. The details of the circuit configuration will be described with reference to FIG.

Back cover open / close switch SW1, film presence / absence detection switch SW2
The main switch SW3 is connected to the CPU 110.
Also. Focal length encoder 26 (set position information transmission section)
Outputs signals of the focal length, the retracted state of the lens, and the state of the magnetic head 1 according to the state in which the lens is squeezed out.
The photo interrupter 12 transmits the passage information of the film F to the CPU 1.
The CPU 110 performs addition and subtraction of the feed amount of one frame and the movement amount of the film F based on the output. Reference numeral 111 denotes a recording / reproducing circuit (head driving unit), and reference numeral 19 denotes a lens barrel driving motor, which is driven by the lens barrel driving circuit 113. Also, 116
Denotes a film feed motor, and a film feed circuit 11
Driven by 5

Next, FIG. 4 is a central sectional view of a camera provided with the magnetic recording / reproducing apparatus, and shows a state where the lens is collapsed. This figure particularly shows the structure of the lens barrel 7 and the state of the magnetic head 1. The first lens chamber 8 does not protrude from the camera body cover 21, and a pair of lens covers 16, 17 is closed by a mechanism (not shown) and is in a state where photographing is not possible.
Is retracted from the film F by the swing lever 2. Incidentally, reference numeral 28 denotes the above-mentioned pressure bonding pad.

The first group lens chamber 8 holds one end 8a of the first group lens 15 and performs focusing by a focusing mechanism (not shown). A pin 9 is implanted in the flange 8b, and is engaged with the cam 7a of the lens barrel 7. In the second group lens chamber 25, the second group lens 10 is fixed, and a pin 24 is implanted on the outer peripheral portion similarly to the first group lens chamber 8, and is engaged with the cam 7b.

A portion 23 projecting annularly from the camera body 20 is related to the cams 7a and 7b and the pins 9 and 24, and rotates the lens barrel 7 by transmitting the lens barrel motor 19 and the gears 18, 11, and 7c. In order to move the first group lens chamber 8 and the second group lens chamber 25 straight, a long straight hole serving as a guide for straightly moving the pins 9 and 24 without rotating them is formed. Also, the focal length encoder 26
In this case, the rotational position of the lens barrel 7 with respect to the camera body 20 is detected by the relative displacement between the brush and the print pattern. 27 is a film pressure plate.

Next, FIG. 5 is a central cross-sectional view when the camera is in a use state. In this state, each lens group is extended to a predetermined position, the lens covers 16 and 17 are opened, the magnetic head 1 is in contact with the film F, and the film F is sandwiched between the magnetic head 1 and the pressure pad 28.

Next, FIG. 6 is a development view of the lens cam ring for explaining the positional relationship between the position of the lens in each state and the one end 4a of the head drive lever. A, B, C, D in the figure indicate the position of a characteristic state in a series of lens movements, a, b, c
Indicates the stroke of the lens barrel 7 for performing various tasks. Then, the state position A indicates the reset state of the lens barrel as shown in FIG. 4, and at this time, the first group lens chamber 8 is in the collapsed state, so that the lens covers 16 and 17 are closed, The head 1 is retracted from the film F, and the camera does not operate.

The state position B is at the head touch position, and the positional relationship on the lens side is the same as the state position A, but is the position where the magnetic head 1 is in contact with the film F. This is because the rotation of the lens barrel 7 causes the one end 4a of the head drive lever 4 to face the portion 7d lower than the high portion 7f of the step cam, so that the spring 5 shown in FIG. The drive lever 4 rotates counterclockwise, the torsion spring 6 rotates the swing lever 2 to follow, and the magnetic head 1 contacts the film F.

Further, the state position C indicates a state in which the lens covers 16 and 17 are opened and the photographing is possible with the lens barrel 7 rotated, and the magnetic head 1 is kept in contact with the film F at this time. The focal length of the lens corresponds to wide, and at this time, a mechanism (not shown) operates to open the lens covers 16 and 17.

The state position D is a position where the focal length is in the telephoto state.

Here, as a conventional problem, there has been a problem that information cannot be accurately recorded / reproduced due to so-called pressure fog.
The pressure fogging varies depending on the rigidity of the film F, the degree of deformation of the film F due to the pressure of the magnetic head 1 and the density of the recorded information. In a situation where the head 1 may be slightly in contact with the film F,
The present invention proposes a method for retracting the magnetic head 1.
As a result, the conventional problem can be solved without using a new actuator and without impairing operability.

Also, in the case of the still camera, unlike the case of the cine camera, since the rewinding operation of the film F is added, it is not necessary to perform all recording and reproduction during the feeding of the film F.
In this sense, the present invention proposes a method for abutting and retracting the magnetic head 1 on the film F of the magnetic head 1 suitable for a still camera.

Hereinafter, the operation of the magnetic recording / reproducing apparatus for a camera according to the present invention will be described in detail. FIG. 7 is a flow chart for explaining the operation of recording / reproducing information on the film when the camera is idlely feeding the film. Here, it is assumed that the ISO information and the number-of-frames information recorded in advance on the film F are read during the idle film feeding.

First, in step 201, the start state of this flowchart is defined as before film loading, and the back cover is opened. Accordingly, in step 202, the lens barrel 7 is reset, the first group lens chamber 8 is collapsed, the lens covers 16, 17 are closed, and the magnetic head 1 is retracted from the film F to a state as shown in FIG. It has become. Next, in step 203, it is determined whether or not the back cover is open.
Returning to step 2, when the back cover is closed, the result is "N", and the presence or absence of the film F is determined in step 204.

If there is no film F, the processing becomes "N" in step 204 and the processing is terminated. If there is a film F, the processing becomes "Y". In step 205, the idle feeding operation of the film F is started. In step 206, the film F is sent, and in step 207, the feed amount is
Via two measures, the feed amount in step 208 it is determined whether reached x _1.

If "N" in step 208, further continues the idle feeding of the film F back to step 206, when the feeding amount of the film F reaches the value x ₁ becomes "Y", the lens barrel drive circuit in step 209 At 113, the lens barrel 7 is operated from the reset position (the state position A in FIG. 6). Then, in step 210, it is determined whether or not the lens barrel 7 has reached the head touch position (state position B in FIG. 6) by detecting the output of the focal length encoder 26. Although the feeding of the film F is continued during this time, a method of slightly decelerating the head so as to prepare for a head touch or temporarily stopping the feeding of the film may be considered.

When the lens barrel 7 is "Y" in step 210 and arrives at the head touch position, the feeding amount at step 211 it is determined whether reached x _2. Thus, when the feed amount is determined as "Y" in step 211 reaches the x _2, so here is information in advance of the film F is written, step 212
To drive the recording / reproducing circuit 111, and at step 213, the film F
Incorporation into the camera reads the information, the amount of feed in step 214 it is determined whether reached x _3. Then, that the feed amount has reached the idle feed end position becomes the "Y" reached x _3, terminates the idle feeding of the film F in step 215, it is determined the closing of the main switch SW3 at step 216.

Next, if the main switch SW3 is turned on and "Y" is determined in step 216, the lens barrel 7 is driven in step 217, and it is determined in step 218 whether the lens covers 16, 17 are open or not. The output of the encoder 26 is detected and determined. When the output is opened and becomes "Y", the drive of the lens barrel 7 is stopped in step 219 (this stop position is the state position C in FIG. 6). Then, when the release button is depressed for photographing, it is determined that there is a release in step 220 and the result is “Y”, and in step 221 a photographing process is performed.

On the other hand, if the ON state of the main switch SW3 cannot be detected in step 216 and becomes "N", the lens barrel 7 is driven in step 222, and subsequently, in step 223, it is determined whether or not the driven lens barrel 7 has reached the reset position. When the determination is made and the reset position is reached, the drive of the lens barrel 7 is stopped in step 224. When shooting here, the main switch SW3
Is turned on, and the lens is moved from the state position A to the state C by the lens barrel drive in step 226.
At step 7, the magnetic head 1 is brought into contact with the film F.
Then, the lens cover is opened, and in step 229, the lens barrel driving is stopped, and the camera is ready for photographing. Next, when the release button is pressed in step 230, shooting is performed.

Next, FIG. 8 is a flowchart for explaining the operations of film feeding and head touch during normal photographing.

Since the magnetic head 1 is in contact with the film F during photographing, the method of retracting the magnetic head 1 depends on the main switch SW3. First, in step 301, it is determined whether or not there is a release by pressing the release button. And
When the release button is pressed and turned on, step 301
And “Y”, and then, in step 302, shooting is performed. Then, when the photographing is completed, winding of the film F is started in step 303, and step 304 is performed while the film F is being moved.
Then, magnetic recording (information may be reproduced at this time) is performed on the film F, and the winding is completed in step 305.

Then, it is determined in step 306 that the main switch SW3 is on, and when this is turned off and becomes "N", step 30
7, the lens barrel 7 is driven, the lens is retracted to the retracted position, and the magnetic head 1 is also retracted.
Then, the reset position of the lens barrel 7 is determined based on the output of the focal length encoder 26, and when the reset position is detected and becomes "Y", the drive of the lens barrel 7 is stopped in step 309 (FIG. 6). State position A).

And then, in order to shoot again from the collapsed state,
When the main switch SW3 is turned on, this is determined in step 310 to be "Y", and in step 311, the lens barrel 7 is driven, the lens covers 16 and 17 are opened, and the magnetic head 1 is brought into contact with the film (FIG. 6). Then, in step 312, it is determined whether or not the lens covers 16, 17 are opened.
Then, it is determined that the release button has been pressed, and the photographing process is performed.

In step 306, if the main switch SW3 remains on, the result is "Y". In this case, the operation is the same as that of a normal camera. In step 313, it is determined that the release button has been pressed. When it is determined to be "Y", the photographing is performed again in step 302.

Next, FIG. 9 is a flowchart for explaining the film rewinding operation. Regarding the rewinding, the end of the film F may be automatically detected, or the rewinding may be started manually.

First, in the rewind mode of the film F in step 401, the lens becomes unnecessary, so that the motor 19 for driving the lens barrel 7 is rotated in step 402 to drive the lens barrel so as to collapse. In step 403, the output of the focal length encoder 26 is detected to determine whether or not the lens barrel 7 has come to the reset position. When the lens barrel 7 comes to the reset position and becomes "Y" (the state shown in FIG. 6). Position A), film F at step 404
Rewind. Then, at this time, the feed amount of the film F is measured in step 405. This is performed in order to determine the information writing position before the end of the rewinding of the film F. The information to be written here is information on photographed frames, information on whether or not trimming has been performed, and the like.

Then, the amount of feed in step 406 it is determined whether reaches x _4, when the "Y" in step 406 the write position have had not a close, the magnetic head 1 has been retracted far in step 407 The lens barrel 7 is driven so as to make contact with the film F, and it is determined in step 408 whether or not the head touch position has been reached. Then, when this comes to the head touch position and becomes “Y”, rewinding is further performed, and step 40
When the amount of the feed 9 is determined to reach the x ₅ "Y", it writes information on the film F in step 410 that came to writing position.

Then, in order to detect the end of rewinding of the film F, the presence or absence of the film F is determined in step 411, and when the film runs out and becomes "N", the rewinding is stopped in step 412, and then the magnetic head 1 is moved to the film position. In step 413, the lens barrel 7 is driven in order to retreat from the lens F. If the lens barrel 7 reaches the reset position and if "Y" is determined in step 414, the rewinding process of the film F is terminated.

Thus, the magnetic recording / reproducing device of the camera of the present invention
In order to perform the operation of the magnetic head 1 suitable for a still camera without impairing operability and without using a new actuator, the operation of the magnetic head 1 is linked to the lens barrel operation when the taking lens is retracted. It is configured so that

That is, in a compact camera with a zoom lens, the range in which a lens barrel or the like is operated in a range where it is not possible to actually shoot is limited for the purpose of shortening the overall length of the camera and opening / closing a lens barrier for protecting the lens. is there.
If the magnetic head 1 is touched / detached (contacted / evacuated) in coordination with this operation, it can be linked with the actual use of the camera, and there is no time loss and there is no uncomfortable feeling in the operation.

In addition, since the operating range of the lens barrel driving member after the lens collapse is increased and the magnetic head 1 is operated during that time, the head is not unnecessarily exposed during idle feeding or rewinding without unnecessarily exposing the lens. Because it can be connected and evacuated, safety is improved, and operability is excellent without uncertainty. Further, since the magnetic head 1 is brought into contact with the film F when necessary, wear of the magnetic head 1 due to sliding of the film F is reduced.

In the present embodiment, the contact and retreat of the magnetic head 1 with respect to the film F are controlled by detecting the state position of the lens barrel 7, but this is controlled by opening / closing the barrier or opening / closing the main switch SW3. You may make it link with on / off.

[Effects of the Invention] As described above, the magnetic recording / reproducing apparatus for a camera according to the present invention is configured so that the magnetic head comes into contact with or retracts from the film according to the state position of the setting unit. This makes it possible to record information by bringing a magnetic head into contact with the film, and to provide a compact and economical camera with good operability.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a magnetic recording / reproducing apparatus for a camera according to the present invention. FIG. 2 is a conceptual view for explaining the concept of this apparatus. FIG. 3 is a circuit configuration diagram of this apparatus. FIG. 5 is a central sectional view of a camera to which the apparatus is applied, FIG. 6 is a developed view of a lens cam ring, and FIGS. 7 to 9 are flowcharts for explaining the operation of the apparatus. 1 ... magnetic head, 2,4 ... lever, 3 ... pin, 5 ...
… Spring, 6… torsion spring, 7… lens barrel, 7a, 7b
… Cam, 8… First lens room, 9,24… Pin, 10…
… 2 group lens, 12… Photo interrupter, 15… 1 group lens, 16,17 …… Lens cover, 19 …… Mounting motor, 20 …… Camera body, 21 …… Body cover part, 25… …
Second group lens chamber, 26 focal length encoder, 27
Film pressure plate, 28 ... Crimping pad, 110 ... CPU, 111 ...
... Recording / reproducing circuit, 113 ... Barrel drive circuit, 115 ... Film feeding circuit, 116 ... Film feeding motor, F ... Film, SW1 ... Back cover open / close switch, SW2 ... Film presence / absence detection Switch, SW3 …… Main switch.

Claims (1)

(57) [Claims] 1. A magnetic recording / reproducing apparatus for a camera having a magnetic head for recording information on a film or reading information recorded on the film, wherein the magnetic head is brought into contact with or retracted from the film. A drive unit, a setting unit that moves to at least two states of a shooting state and a non-shooting state and determines whether or not shooting is possible, and a setting position information transmission unit that moves the head driving unit according to the position of the setting unit. A magnetic recording / reproducing device for a camera comprising: