JP2887002B2 - Camera and magnetic head control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film with a magnetic storage unit, comprising: a magnetic head for writing or reading information to or from a magnetic storage unit provided on the film, and a motor for feeding the film. A camera that can be used, and
The present invention relates to improvement of a magnetic head control device applied to the film.

[0002]

2. Description of the Related Art Conventionally, in a film feeding apparatus for a camera, a leading end of a film (a so-called leader) protruding from a film cartridge is engaged with a sprocket or a film take-up spool of the camera. In this state, the film was loaded by driving the sprocket or the film take-up spool. However, this type of film is not only troublesome because a person must set the leading edge of the film, but if the position of the leading edge of the film is set incorrectly, the film will not be loaded properly or the leading edge of the film will be careless. The drawback is that the film is exposed and becomes unusable. Therefore, in recent years, the following has been proposed in US Pat. No. 4,832,406 as a new type of film cartridge.

A film passing slit, a film fixed at one end to a supply spool, and wound around the supply spool,
A pressing member disposed coaxially with the supply spool and restricting the radial expansion of the outermost periphery of the film by the regulating portion, and preventing the outermost periphery of the film from substantially contacting the inner wall of the film cartridge; A release part that deforms a part of the pressing member, continuously releases the outermost peripheral portion of the film from the restriction in the radial direction of the pressing member, and a guiding part that guides the part of the film released from the restriction to the film passage slit. The outer periphery of the film and the pressing member are prevented from slipping by the expansion of the outermost periphery due to the loosening of the film caused by the rotation of the supply spool in the film pushing direction, and a driving force is applied to the film in the pushing direction by applying the driving force to the film. It allows for extrusion of the film from the cartridge. Hereinafter, this type of film cartridge capable of discharging the film by rotation of the supply spool will be referred to as an extrusion-type film cartridge.

If this extruded film cartridge is used, after loading into the camera, the supply spool of the cartridge is rotated by a fork to discharge the film, and the film is taken up by the film take-up spool of the camera. The film can be extruded until it is wound around the film and then fed by the film take-up spool, so that the user does not need to touch the leading edge of the film. The disadvantages are gone.

In recent years, using a film having a magnetic storage unit, photographic information such as a shutter time, an aperture value, and a photographic date has been written into the magnetic storage unit of a photographic frame. A camera for reading information is disclosed in U.S. Pat. No. 4,864,332 and the like.

[0006]

By the way, film is usually fed by a motor, but it takes some time from the start of driving until the rotation of the motor stabilizes. Therefore, the rotation of the motor fluctuates at the time of startup and thereafter, and as a result, the film feeding speed fluctuates. Therefore, when the photographing information as described above is written (or read) at the time of winding of the next frame after the photographing of a certain frame is completed, writing of erroneous information (or reading error).
In some cases.

In view of the above, an object of the present invention is to provide a camera that can use a film with a magnetic storage unit and that can properly write or read information during a feeding operation of a photographed frame, and An object of the present invention is to provide a magnetic head control device applied to the film.

[0008]

To achieve the above object, the present invention provides a magnetic head for writing or reading information to or from a magnetic storage unit provided on a film, and a motor for feeding the film. In a camera which can use a film with a magnetic storage unit provided with a motor, the feeding operation is stabilized from the start of the feeding operation of the photographed frame by the motor.
A timer means for counting a predetermined time required, by which the predetermined time is timed by said timer means, a camera can be used with magnetic storage portions film having a drive control means for driving the magnetic head Is what you do. Similarly, to achieve the above object, the present invention provides
A magnetic head for writing or reading information to or from a magnetic storage unit provided on the film, and a motor for feeding the film.
A magnetic head control device applied to a film with a magnetic storage unit provided with a motor, for measuring a predetermined time required for the feeding operation to stabilize from the start of the feeding operation of the photographed frame by the motor. A magnetic head control device applied to a film with a magnetic storage unit, comprising: timer means for performing the measurement , and the predetermined time being measured by the timer means, and drive control means for driving the magnetic head. Is what you do.

[0009]

[0010]

1 to 11 show a first embodiment of the present invention.

2 to 8 are views showing a mechanical structure according to the present invention. FIG. 2 is a cross-sectional view of a main part of the camera, and FIG.
4 is a perspective view of a film feeding mechanism, FIG. 4 is a plan view of a gear train when the film is wound up, FIG. 5 is a plan view of a gear train when the film is rewound, and FIG. 6 is a rear view of the camera without a back cover. 7 is a sectional view of FIG. 6A-A, and FIG. 8 is a sectional view of FIG. 6BB.

In these figures, reference numeral 1 denotes a film feeding motor, which rotates forward when the film is wound (arrow B in FIG. 4).
Direction), and reverse when rewinding the film (the direction of arrow C in FIG. 5). Reference numeral 2 denotes a pinion gear fixed to the rotation shaft of the motor 1. Reference numeral 3 denotes a first sun gear which meshes with the pinion gear 2. Reference numeral 4 denotes a first planetary gear, which meshes with the first sun gear 3. 5 connects the first sun gear 3 and the first planetary gear 4 and holds the first planetary gear rotatably while generating a frictional force between the first sun gear 3 and the first planetary gear 4; A first connection lever in which the first planetary gear 4 revolves around the first sun gear 3 when the first sun gear 3 rotates.
It is. The first sun gear 3, first planetary gear 4, and first connecting lever 5 constitute a known planetary gear mechanism. Reference numeral 6 denotes a spool gear which meshes with the first planetary gear 4 only when the film feed motor 1 rotates forward. Reference numeral 7 denotes a film take-up spool which is fixed to the spool gear 6 and moves integrally.

Reference numeral 8 denotes a first idler gear that always meshes with the first sun gear 3, and 9 denotes a large gear portion 9a and a small gear portion 9b.
A first two-stage gear in which a large gear portion 9a meshes with the first idler gear 8; a second idler gear in mesh with a small gear portion 9b of the first two-stage gear 9; A third idler gear meshing with the idler gear 10 of the first embodiment is a second idler gear meshing with the third idler gear 11 of the second embodiment.
The sun gear 13 is a second planetary gear that meshes with the second sun gear 12. Reference numeral 14 denotes a third planetary gear, which meshes with the second sun gear, similarly to the second planetary gear 13. Numeral 15 connects the second sun gear 12, the second planetary gear 13, and the third planetary gear 14 with arms 15a and 15b, respectively, and holds each planetary gear rotatably while generating frictional force. The second connection lever is such that the second planetary gear 13 and the third planetary gear 14 revolve around the second sun gear 12 as a center of rotation by rotation of the second sun gear 12. . The second sun gear 1
2nd and 2nd and 3rd planetary gears 13 and 14 and 2nd connection lever
15 constitutes a known planetary gear mechanism.

Reference numeral 16 denotes a fourth idler gear. When the film feeding motor 1 is rotated forward, the second connecting lever 15 rotates leftward about the second sun gear 12 around the second sun gear 12 to rotate the second idler gear. The second planetary gear 13 meshes with the third planetary gear 13 but does not mesh with the third planetary gear 14. When the motor 1 rotates in the reverse direction, the second coupling lever 15 rotates rightward to mesh with the third planetary gear, thereby forming the second planetary gear. The gear 13 is a gear that does not mesh. 17 has a large gear portion 17a and a small gear portion 17b, and the large gear portion 17a is the fourth gear portion.
The second two-stage gear 18 meshing with the idler 16 of the first embodiment has a large gear portion 18a and a small gear portion 18b, and has a large gear portion 18a.
The third two-stage gear meshes with the small gear portion 17b of the second two-stage gear 17, 19 is a fork gear meshed with the small gear portion 18b of the third two-stage gear 18, and 20 is the fork gear.
The fork which rotates integrally with the gear 19 rotates a supply spool (not shown) in the film cartridge 33 (see FIG. 2), thereby pushing the film 27 out of the cartridge 33. And roll-in.

Reference numeral 21 denotes a camera main body (see FIG. 6), reference numeral 22 denotes a cartridge chamber, and reference numerals 23 and 24 denote support shafts having both ends fixed to appropriate positions of the camera main body 21.
Are arranged parallel to each other and perpendicular to the running direction of the film 27. Note that the support shafts 23 and 24 in the present embodiment have a columnar shape with a circular cross section as shown in FIG.

Reference numeral 25 denotes a pressure plate, and a pair of locking portions 25a and 25b are provided on the upper surface (the surface opposite to the surface in contact with the film 27) as shown in FIG. The locking part 25
Reference numerals a and 25b each include a vertical portion perpendicular to the pressure plate 25 and a horizontal portion bent outward at a right angle from the vertical portion.
It is shaped like a letter and projects as a whole in the optical axis direction. As shown in FIG. 6, the locking portions 25a and 25b are arranged in an arc shape at a symmetrical position about a substantially central portion of the pressure plate 25 in plan view.

Here, the distance L2 (see FIG. 7) between the outer sides of the vertical portions of the locking portions 25a and 25b is determined by the distance between the support shafts 23 and 24.
The support shafts 23 and 24 are located in a concave space between the vertical and horizontal portions of the locking portions 25a and 25b and the pressure plate 25. It is supposed to. Therefore, the pressure plate 25 is supported by the support shaft 2.
6 can be moved in the vertical direction in FIG. As shown in FIG. 7, the horizontal portions of the locking portions 25a and 25b sandwich the support shafts 23 and 24 and regulate the front and rear positions of the pressure plate 25 in the optical axis direction.

The pressure plate 25 is provided with guide members 25c and 25d integrally at both lower corners on the rear side as shown in FIG. 6, and at a lower position on the rear side as shown in FIG. The magnetic head 26 is fixed.
The head gap is perpendicular to the film running direction.

Reference numerals 28 and 29 denote springs, which are respectively disposed on the cartridge chamber 22 side and the film take-up spool 7 side with the rotation center of the pressure plate 25 interposed therebetween. And urges the pressure plate 25 in a direction of pulling it upward. As a result, the guide members 25c and 25d provided on the pressure plate 25 come into pressure contact with the end face of the film 27, and the positional relationship of the pressure plate 25 with respect to the film 27 is always constant. A magnetic storage unit (not shown) is formed on the surface of the film 27 on the pressure plate 25 side, and various information relating to photographing is written (or read) by the magnetic head 26. . Reference numeral 30 denotes an outer rail (see FIG. 8), which regulates the upward position of the film 27.

As shown in FIG. 6, the guide members 25c and 25d have tapered surfaces extending toward the cartridge chamber 22, respectively, so that the film cartridge 33 housed in the cartridge chamber 22 is formed. The film 27 extruded from the second member smoothly pushes down the guide members 25c and 25d against the urging forces of the springs 28 and 29.

Reference numeral 31 denotes a dowel 5 of the camera body 21 which is disposed at a position facing the magnetic head 26 with the film 27 interposed therebetween.
The film 27 is attached to the magnetic head 26 by a spring 32 attached to the camera body 21 at one end with a pressing lever (see FIG. 2) fitted and slidably fitted in the slots 9 and 60 with the elongated holes 31a and 31b. The pressing portion 31c is urged to press. Reference numeral 61 denotes a roller plate made of a flexible material which has one end attached to the inner wall of the spool chamber 62 and presses the film take-up spool 7 at its 61a portion (see FIG. 2). When the film 27 is auto-loaded, the film 27 is spun up.
This is to make it easy to wind around the file 7.

Referring to the film cartridge 33, a configuration of this kind of film cartridge is disclosed in US Pat. No. 4,834,306. The film cartridge has a film passing slit and a supply spool at one end. And a film wound around the supply spool and a coaxial arrangement of the supply spool and a radial portion of the outermost periphery of the film regulated by a regulating portion. A pressing member that prevents substantial contact with the inner wall of the pressing member, a releasing portion that deforms a part of the pressing member, and continuously releases the outermost peripheral portion of the film from the restriction in the radial direction of the pressing member, and releases the restriction. And a guiding portion for guiding a portion of the formed film to the film passing slit. The outermost portion of the outermost periphery due to loosening of the film caused by rotation of the supply spool in the film pushing direction is provided. Rising by a state without slip between the outer peripheral and the pressing member of the film, giving the extrusion direction of the driving force to the film, the film force - which enables the extrusion of film from cartridge.

This extruded film cartridge 33
When the cartridge is loaded into the camera, the fork 20 can be used to set the cartridge supply spool 33b without troublesome work such as setting the leading end of the film in a predetermined manner.
Is rotated to eject the film 27, extrude the film 27 until the film 27 is wound around the film take-up spool 7, and then feed the film 27 by the film take-up spool 7. Configuration can be taken.

In the above configuration, after the film cartridge 33 is loaded in the cartridge chamber 22, the film feed motor 1 (pinion gear 2) is rotated in the direction of arrow B as shown in FIG. (When turned forward), the first
Of the sun gear 3 rotates clockwise, and the first planetary gear 4 is rotated by the action of the first connecting lever 5.
Revolve clockwise about the sun gear 3 of the first rotation, and eventually mesh with the spool gear 6, the driving force of the film feed motor 1 is transmitted to the spool gear 6, and the film take-up spool 7 It starts to rotate clockwise.

The driving force is transmitted via an idler gear 8 which is another gear meshing with the first sun gear 3 via a first two-stage gear 9, a second idler gear 10, and a third idler gear 11. To the second sun gear 12. Therefore, since the second sun gear rotates counterclockwise, the second planetary gear 13 and the third planetary gear 14 rotate about the second sun gear by the action of the second coupling lever 15. Revolving in the counterclockwise direction, the second planetary gear 13 eventually meshes with the fourth idler gear 16. As a result, the driving force of the film feeding motor 1 in the direction B is transmitted to the fourth idler gear 16 as a driving force in the counterclockwise direction, and further, the second two-stage gear 17 and the third two-stage gear 18 are provided. To the fork gear 19 via the
The clock 20 rotates clockwise.

Here, the gear ratio of the gear train is configured as follows.

The peripheral speed of the film take-up spool 7 is set to “V
1 ", assuming that the speed of the film 27 extruded from the film cartridge 33 by the fork 20 is" V2 ",
There is a relationship of “V1> V2”.

When the film 27 is extruded from the film cartridge 33 by the clockwise rotation of the fork 20, the leading end of the film enters the gap between the pressure plate 25 and the camera body 21. Further film 27
6 moves to the right in FIG. 6, the leading end of the film comes into contact with the guide member 25 d, and pushes down the spring 29 against the urging force of the spring 29. Thereby, the spring 29
The position of the left side of the film 27 and the pressure plate 25 is regulated by the guide member 25d. Further, when the film 27 moves, the leading end of the film approaches the position of the magnetic head 26. Since the pressing lever 31 is configured to always press the film 27 against the magnetic head 26 by the spring 32, the leading end of the film 31 is pressed by the pressing lever 31.
The magnetic head 26 abuts against the magnetic head 26 and enters between the magnetic head 26 and the magnetic head 26 against the urging force of the spring 32. When the film 27 moves further, the leading end of the film 27 comes into contact with the guide member 25c, and pushes down the urging force of the spring 28 against it. Thus, the right position of the film 27 and the pressure plate 25 is regulated by the spring 28 and the guide portion 25c. At this point, since the magnetic head 26 and the magnetic storage unit (not shown) of the film 27 are already in sliding contact with each other as described above, writing or reading of photographing information can be performed. FIG. 9 shows the state thus far. Finally, the leading end of the film is wound around the film take-up spool 7. Thereafter, the film 27 is wound only by the rotation of the film take-up spool 7 by the film feeding motor 1, for the following reason.

According to the relationship "V1>V2", when the film take-up spool 7 is wound, the film take-up spool 7
The gear 7 is transmitted through the film 27 in the order of the fork gear 19, the third two-stage gear 18, the second two-stage gear 17, and the fourth idler gear 16, and the second planetary gear 13 rotates clockwise. The rotation speed of the fourth idler gear 16 in the counterclockwise direction is higher than that of the fourth idler gear 1.
6 jumps off the second planetary gear 13, the meshing between the second planetary gear 13 and the fourth idler gear 16 is momentarily released, and the speed difference is absorbed.

Therefore, when the film 27 is wound around the film take-up spool 7, the film speed is changed from "V2" to "V1". As a method of winding the film 27 around the film take-up spool 7, a well-known means (for example, hooking the perforation of the film 27 with a claw provided on the film take-up spool 7, or using a camera) This is performed by a roller plate 61 provided on the main body and pressing the film 27 against the film take-up spool 7).

Even if the film 27 undulates during the feeding of the film, the pressure plate 25 can move in the direction perpendicular to the film running direction with respect to the camera body 21 and can rotate on a plane parallel to the film 27 surface. And the spring 2
8, 29, guide members 25c, 25d of the pressure plate 25
Is pressed against the film end face, so that the undulation can be accurately followed. At this time, the magnetic head 26 is integral with the pressure plate 25, and the guide members 25 c and 25 d provided on the pressure plate 25 by the springs 28 and 29 are in contact with the lower end of the film 27. (Not shown) can always be slid into contact with the magnetic storage section of the film 27 perpendicularly to the film running direction.

Thereafter, cueing and photographing of the first frame, film winding to the next frame, and the like are performed. This will be described later, and the operation at the time of film rewind will be described next.

This operation will be described with reference to FIG. 5. When the film feed motor 1 is rotated in the direction of the arrow C, the first connecting lever 5 and the first planetary gear 4 become the first sun gear 3 Is revolved counterclockwise around the center of rotation until the end 5a of the first connection lever 5 comes into contact with the stopper 28. Therefore, the engagement between the first planetary gear 4 and the spool gear 6 is released.

At this time, the second sun gear 12 rotates clockwise, whereby the second planetary gear 13 and the third planetary gear 14 are rotated by the action of the second connecting lever 15. Revolve clockwise around the gear 12 as the center of rotation.
The idler gear 16 and the second planetary gear 13 are disengaged from each other, and the fourth idler gear 16 and the third planetary gear 14 are engaged instead. Accordingly, the fork gear 19 rotates counterclockwise, the fork 20 causes the supply spool 33b in the film cartridge 33 to rotate in the reverse direction, and the film 27 is wound into the cartridge 33.

FIG. 1 is an electric block diagram according to one embodiment of the present invention.

In this figure, reference numeral 63 denotes a control circuit for controlling the operation of the whole camera, and 64 includes a distance measuring circuit and a photometric circuit for measuring the distance to the subject. An AF / AE control circuit 65 for opening and closing a shutter for controlling exposure of the film 27 in accordance with the luminance, drives a magnetic head 26, and drives a magnetic head 26 to write or read information to or from a magnetic storage unit of the film 27. This is a head drive circuit. 66 is a film feed control circuit for controlling the rotation of the film feed motor 1, 68 is a cartridge detection switch which is turned on when the film cartridge 33 is loaded in the cartridge chamber 22, 69
Is a release switch connected in series with the cartridge lid open / close switch 53, and is turned on by manual operation to start release of the camera.

Next, the operation of the control circuit 63 will be described with reference to the flowcharts shown in FIGS. [Step 100] When the film cartridge 33 is loaded into the cartridge chamber 22 and the cartridge lid 51 is closed, the cartridge lid open / close switch 53 and the cartridge detection switch 68 are both turned on. When the cartridge detection switch 68 is turned on, the control circuit 63 determines that the camera is loaded with the film cartridge 33, and proceeds to step 101. [Step 101] The internal timer is reset. "Step 102" Since the film cartridge 33 has been loaded, a winding start signal is sent to the film feed control circuit 66 here. As a result, the film feeding motor 1 rotates in the direction of arrow B as shown in FIG. 4, and the extrusion of the film 27 from the film cartridge 33 via the gear train described above is started. "Step 103" Immediately after sending the winding start signal to the film feeding control circuit 66, the counting operation of the timer is started.

In step 102, the film feed control circuit 66 is driven to drive the film feed motor 1.
Starts rotating, the film cartridge 3
The film 27 is extruded from the inside of the motor 3. The rising characteristics of the motor 1, the inertia of the gear train, the backlash of the gear train, the fork 20 and the supply spool in the film cartridge 1 are removed. It is assumed that a time Ta is required after the winding start signal is sent until the film feeding speed becomes a stable steady speed due to backlash or the like. The time Ta is naturally longer than the time required for the film 27 to pass through the position of the magnetic head 26. [Step 104] It is determined whether or not the timer has reached a predetermined time T1 (however, T1 ≧ Ta). If not, the process returns to Step 102, and if the predetermined time T1 has elapsed, the process proceeds to Step 105. [Step 105] The counting operation of the timer is stopped. "Step 106" At this point, as is apparent from the above description, since the film feed speed is in a stable state, information on the film recorded in the magnetic storage unit of the film 27, for example, The film sensitivity, film type, and the like are read by the magnetic head 26 (or information is written as necessary). "Step 107" Here, the film feed amount is calculated by counting the performance (not shown) of the film 27 by a photointerrupter (not shown), for example, or the film is pressed against the film 27 (not shown). The number of rotations of the roller is counted by a pulse plate or the like to calculate the film feeding amount, or the film feeding amount is calculated based on the driving time of the film feeding motor 1, for example.
It is determined whether the first frame has arrived at the cha portion, and film feeding is continued until the first frame reaches the portion. When it is determined that the first frame has reached the aperture portion, step 1 is executed.
Proceed to 08. "Step 108" Here, the film feed control circuit 6
The drive of the film drive motor 1 is stopped via 6 and the film winding is stopped.

When the above operation is completed, the flow proceeds to FIG.
To step 109 shown in FIG. "Step 109" Here, it is determined whether or not the first stroke of the release button (not shown) has been performed and the switch 69 has been turned on, and the process proceeds to step 110 by determining that the switch 69 has been turned on. [Step 110] The AF / AE control circuit 64 is operated to measure the brightness of the subject, calculate distance information to the subject (distance measurement information), and focus an unillustrated photographing lens based on the information. An operation and a photographing operation such as an exposure operation by shutter control are performed. [Step 111] A comparison is made between the number of times of release, the film feed amount, etc., and the specified number of frames of the film read in step 106, and it is determined whether or not there are any remaining frames. As a result, if there are no remaining frames, the process proceeds to step 119, and if there are no remaining frames, the process proceeds to step 112. [Step 112] The film feed control circuit 66 is driven to start winding the next frame. "Step 113" The internal timer is started. "Step 114" It is determined whether or not the timer has reached a predetermined time T1 (however, T1≥Ta). If not, the process remains at this step, and if it has reached the predetermined time T1, the process proceeds to step 115. This is because, as described above, the rising characteristics of the film feeding motor 1, the inertia of the gear train, the backlash of the gear train, the fork 20 and the supply spool in the film cartridge 1. This is because the magnetic head 26 is driven after the film feeding speed becomes a stable steady speed due to play or the like. [Step 115] The counting operation of the timer is stopped. "Step 116" As the film 27 is wound onto the next frame, the magnetic head 2
6 is moved to the magnetic storage section of
The shooting information (information such as shutter speed, aperture value, date, etc.) at 0 is written. "Step 117" As described above, the film 27 is measured by, for example, counting the performance of the film 27 with a photo interrupter (not shown) or counting the number of rotations of a roller pressed against the film 27. It is determined whether or not one frame has been wound. When one frame is wound up, the process proceeds to step 118. "Step 118" Here, the film feed control circuit 6
The drive of the film feeding motor 1 is stopped via 6, the winding of the film 27 is stopped, and the process returns to step 109. "Step 119" Here, since there is no remaining frame of the film 27, the film feeding mode is started via the film feeding control circuit 66 to start the rewinding (winding into the film cartridge 33) of the film 27. -Data 1 is indicated by arrow C in FIG.
In the direction (film rewinding direction). "Step 120" The internal timer is started. "Step 121" It is determined whether or not the timer has reached a predetermined time T1 (however, T1≥Ta). If not, the process remains in this step. If the predetermined time T1 has come, the process proceeds to step 122. This, as before,
The film feeding speed is stabilized by the rising characteristics of the film feeding motor 1, the inertia of the gear train, the backlash of the gear train, the play of the fork 20 and the supply spool in the film cartridge 1, and the like. This is because the magnetic head 26 is driven after the steady speed is reached. [Step 122] The counting operation of the timer is stopped. [Step 123] The magnetic head drive circuit 65 is operated in accordance with the operation of rewinding the film 27 to the film cartridge 33.
To drive the magnetic head 26 to write the photographing information (information on the shutter speed, aperture value, date, etc.) in the step 110 in the magnetic storage section of the last photographing frame of the film 27. "Step 124" The film 27 is rewound into the film cartridge 33, and it is not shown by a known means, for example, a user's judgment that the film 27 has been completely rewound into the film cartridge 33. When it is determined that a signal has been input from the input means, that a predetermined time has elapsed since the film was rewound, or that it was detected by the above-described method of detecting the position of the film 27 by the photocoupler, the process proceeds to step 125. . If not detected, the process returns to step 119. [Step 125] The driving of the film feeding motor 1 is stopped via the film feeding control circuit 66, and thereafter the operation of the entire camera is stopped.

FIGS. 12 and 13 show the mechanical structure of the main part in the second embodiment of the present invention.

In these figures, reference numeral 26 denotes a magnetic head similar to that of the first embodiment for recording information on and reading information from the magnetic storage section of the film 27 running in the direction of arrow A in FIG. It is attached to a camera body, a main plate, a film pressure plate, or the like as shown. 26a is a head gap, 103 is a projection 10 provided on a main plate (not shown).
This pressing lever is configured such that its long holes 103a and 103b are fitted into 9a and 109b and are slidable in the direction of arrow B in FIG. 104 is 10 for pressing lever 103
4a, which are attached at 4a and which move in conjunction with the pressing lever 103,
4b, 104c and 104d, the film contact portion 10
4b is formed in a concave shape, and 104c and 104d are formed in a convex shape.
04b and 104d have a substantially U-shape.

Reference numeral 105 denotes a spring, one end of which is located on a main plate (not shown), and the other end of which is a spring hook 103c of a pressing lever 103.
The pressing lever 103 is urged upward in FIG. 106 is a projection 10 of the main plate (not shown).
The rack levers 9c and 109d are fitted with the elongated holes 106a and 106b so as to be slidable in the direction of arrow B in FIG.
3 can be engaged with the arm 103d. 107
A worm member rotatably mounted on a base plate (not shown) comprises a worm wheel portion 107a meshed with a rack portion 106d of the rack lever 106 and a gear portion 107b. 108 is the gear portion 10 of the worm member 106
7b, and is fixed to the rotating shaft of a pad driving motor 110 mounted on a base plate (not shown).

The pad driving motor 110 can rotate forward and reverse, and the rack lever 106 can rotate forward and backward in FIG.
2 is configured to move in an upward direction and to move in a reverse direction in a downward direction.

Reference numeral 111 denotes a switch mounted on a main plate (not shown), and the contact piece 111a is connected to the arm 106 of the rack lever 106.
e, and the contact pieces 111a and 111b are electrically connected, so that the rack lever-1 of the pad driving motor 110
06 is prohibited to move downward in the figure. 11
Reference numeral 2 denotes a switch mounted on a base plate (not shown).
2a can be brought into contact with the arm portion 106e of the lock lever 106, and when the contact pieces 112a and 112b conduct,
The rotation of the pad driving motor 110 for moving the rack lever 106 upward in the drawing is prohibited.

In the above configuration, FIG. 12 shows the positional relationship between the members when the magnetic head 26 is not driven.
In this case, since the arm 106c of the rack lever 106 and the arm 103d of the pressing lever 103 are engaged with each other, the upward movement of the pressing lever 103 in FIG. It is not in contact with the pad 104 and does not adversely affect the flatness of the film 27 and the like. At this time, the contact pieces 111a and 111b are conducting, prohibiting the rack lever 106 from further moving up and down.

FIG. 13 shows the film 2 by the magnetic head 26.
7 shows the positional relationship of each member when writing or reading information to or from the magnetic storage unit (not shown). By rotating the pad driving motor 110 forward from the state shown in FIG. State. That is, the pad driving motor 1
When the rack 10 rotates forward, the rack lever 106 moves upward in FIG. 12 via the worm member 107, whereby the pressing lever 103 is released from the position restriction by the rack lever 106, and the spring 105 is attached. It moves upward according to the force, and stops in a state where the pad 104 rotatably attached to the leading end presses the film 27 against the magnetic head 26. In this state, the power supply to the pad driving motor 110 is cut off based on, for example, a power supply time or a change in the state of a switch that operates in conjunction with the movement of the rack lever 106. The rack lever 106 stops, and accordingly, the rack lever 106 also stops.

In this state, the film 27 is
6, it is possible to reliably write and read information to and from the magnetic storage section of the film 27. When writing or reading this information, it goes without saying that the film 27 is fed in the direction of the arrow A in FIG.

When the writing and reading of the information are completed,
Reverse conduction to the pad driving motor 110 is performed. As a result, the motor 110 is rotated in the reverse direction, and the rack lever 106 starts to move downward in FIG. 13, whereby the arm 106c of the rack lever 106 engages with the arm 103 of the pressing lever 103. Therefore, the pressing lever 103 also starts to move downward in FIG. 13 similarly to the urging force of the spring 105. Therefore, pad 104
Is separated from the film 27 surface. Thereafter, the power supply to the motor 110 is cut off by changing the state of a switch for detecting the initial position of the rack lever 106 or the pad 104 or controlling the power supply time to the motor 110 for driving the pad. The state returns to state 12.

With such a configuration, when the film is wound up, the leading end of the film 27 does not buckle or break when passing through the position of the magnetic head 26.

FIG. 14 is a diagram showing a circuit configuration according to the second embodiment of the present invention, and portions having the same functions as those in FIG. 1 are denoted by the same reference numerals.

In FIG. 14, reference numeral 113 denotes a pad driving motor control circuit for controlling the driving of the pad driving motor 110.

FIG. 15 is a flowchart showing a main part of the operation of the control circuit 63 shown in FIG.
Of the second embodiment are mainly shown. "Step 105" The counting operation of the timer is stopped, and the process proceeds to step 201. "Step 201" Here, the pad driving motor 110 is rotated forward through the pad driving motor control circuit 113, and the film 104 is moved by the pad 104 as shown in FIG.
7 is pressed against the magnetic head 26. And step 106
Proceed to. "Step 106" At this point, since the film feeding speed is in a stable state, the information on the film recorded in the magnetic storage unit of the film 27, for example, the number of specified frames, the film sensitivity, the film type, etc. The data is read by the head 26 (or information is written as necessary). Further, since the film 27 is pressed against the magnetic head 26 by the pad 104 in this manner, information is read (or written) accurately. "Step 107" Here, the film feed amount is calculated by counting the performance (not shown) of the film 27 by a photointerrupter (not shown), for example, or the film is pressed against the film 27 (not shown). The number of rotations of the roller is counted by a pulse plate or the like to calculate the film feeding amount, or the film feeding amount is calculated based on the driving time of the film feeding motor 1, for example.
It is determined whether the first frame has arrived at the cha portion, and film feeding is continued until the first frame reaches the portion. When it is determined that the first frame has reached the aperture portion, step 2 is executed.
Go to 02. "Step 202" Here, the pad driving motor 110 is reversed through the pad driving motor control circuit 113 to return from the state of FIG. 13 to the state of FIG. That is, the pad 104 is retracted from the surface of the film 27. Then, the process proceeds to step 108.

Although not shown, the same operation as in step 201 is performed before step 116 in FIG. 11, and the operation in step 202 is performed after step 116. Further, before step 122 in FIG.
After step 2, the operation of step 202 is performed.

According to each of the above-described embodiments, writing (or reading) of shooting information such as shutter time is performed at the time of film winding after the end of shooting, but writing (or reading) of this information is performed by film feeding. Since the magnetic head is driven when the rotation of the feeding motor 1 is stabilized and the film feeding speed is stabilized, an information reading error occurs.
Or writing incorrect information. (Correspondence between the invention and the embodiment) In the above embodiment, the magnetic head 26 corresponds to the magnetic head of the present invention, the film feeding motor 1 corresponds to the motor for feeding the film of the present invention, This timer corresponds to timer means of the present invention, and the magnetic head drive circuit 65 corresponds to drive control means of the present invention.

(Modification) In this embodiment, a case is shown in which an extruded film cartridge is used, but an ordinary film cartridge may be used.

[0056]

As described above, according to the present invention, a camera that can use a film with a magnetic storage unit, can write or read information properly at the time of film winding, and It is possible to provide a magnetic head control device applied to a film.

[Brief description of the drawings]

FIG. 1 is an electric block diagram of a camera according to a first embodiment of the present invention.

FIG. 2 is a plan view showing a main part of the camera according to the first embodiment of the present invention.

FIG. 3 is a perspective view of a film feeding mechanism of the camera according to the first embodiment of the present invention.

FIG. 4 is a plan view showing a gear train at the time of film winding of the camera according to the first embodiment of the present invention.

FIG. 5 is a plan view showing a gear train when rewinding the film of the camera in the first embodiment of the present invention.

FIG. 6 is a rear view showing the camera according to the first embodiment of the present invention with the back cover omitted;

FIG. 7 is a sectional view taken along line AA of FIG. 6;

FIG. 8 is a sectional view taken along line BB of FIG. 6;

FIG. 9 is a rear view of the camera according to the first embodiment of the present invention, in which the back cover is omitted while the film is being fed.

FIG. 10 is a flowchart showing a part of the operation of the control circuit of FIG. 1;

FIG. 11 is a flowchart showing a continuation of the operation in FIG. 10;

FIG. 12 is a plan view showing a state of each member when a magnetic head is not driven in a second embodiment of the present invention.

FIG. 13 is a plan view showing a state of each member when a magnetic head is driven in a second embodiment of the present invention.

FIG. 14 is a block diagram of a camera according to a second embodiment of the present invention.

FIG. 15 is a flowchart showing the operation of the main part of the control circuit of FIG. 14;

[Description of sign]

 DESCRIPTION OF SYMBOLS 1 Film feeding motor 7 Film take-up spool 26 Magnetic head 27 Film 33 Film cartridge 63 Control circuit

Claims (2)

(57) [Claims] 1. A camera which can use a film with a magnetic storage unit having a magnetic head for writing or reading information to or from a magnetic storage unit provided on the film, and a motor for feeding the film. From the start of the feeding operation of the photographed frame by the motor to the time when the feeding operation is stabilized.
A timer means for counting a predetermined time, by which the predetermined time is timed by said timer means, used with magnetic storage portions film characterized by having a drive control means for driving the magnetic head Camera that can. 2. A magnetic head applied to a film with a magnetic storage unit, comprising: a magnetic head for writing or reading information to or from a magnetic storage unit provided on the film, and a motor for feeding the film. In the control device, the feed operation is stabilized from the start of the feed operation of the photographed frame by the motor .
A timer means for counting a predetermined time required for, by which the predetermined time is timed by said timer means, the attached magnetic storage unit film characterized by having a drive control means for driving the magnetic head Applied magnetic head control device.