JPH0486637A - Camera using film with magnetic storage part - Google Patents

Abstract

PURPOSE:To carry out the writhing or reading of information at proper timing by judging that the winding of a film on a film taking-up spool is carried out by means of the detection of a great speed change with a speed detecting means and immediately driving a magnetic head. CONSTITUTION:A film feeding means 23 arranged near by an aperture and feeding the film 34 at speed later than film feeding speed by the film taking up spool 7 while the feeding of the film 34 by the film taking up spool 7 is started, and a speed detecting means 108 detecting the moving speed of the film 34 from the rotation of the film feeding means 23, are provided. Further, a magnetic head control means 112 driving the magnetic head 48 by discriminating the detection of the great speed change on the speed detecting means 108, after the winding of the film is started, is provided. When the great speed change is detected by the speed detecting means 108, it is judged that the winding of the film on the taking up spool 7 is carried out, and immediately the magnetic head 48 is driven to start the writing or reading of the information. Thus, the writing or reading of the information is carried out at the proper timing.

Description

Detailed Description of the Invention (Field of Application of the Invention) The present invention relates to a magnetic head that writes information to or reads information from a magnetic storage section provided on a film, and a magnetic head that winds the film by transmitting driving force. The present invention relates to an improvement in a camera using a film with a magnetic storage unit and a film take-up spool.

(Background of the Invention) Conventionally, in a camera film feeding device, when the leading end of the film protruding from the film cartridge (so-called leader part) is engaged with the sprocket or film take-up spool of the camera, the sprocket or Film was loaded by driving the film take-up spool. However, with this type of film, the leading edge of the film must be manually set, which is not only cumbersome, but if the leading edge of the film is set in the wrong position, the film may not be loaded properly, or the leading edge of the film may be pulled carelessly. This had the disadvantage of exposing the film to light and rendering it unusable.

Therefore, in recent years, the following new type of film cartridge has been proposed in US Pat. No. 4,834,306.

A film passing slit, a film fixed to a supply spool at one end and wound around the supply spool, and a regulating part regulating the radial expansion of the outermost periphery of the film arranged coaxially with the supply spool; a holding member that prevents the film from substantially contacting the inner wall of the film cartridge; a release portion that deforms a portion of the holding member to continuously release the outermost peripheral portion of the film from the radial restriction of the holding member; It is equipped with a guiding part that guides the part of the film released from regulation to the film passing slit, and prevents slipping between the outer periphery of the film and the holding member due to the expansion of the outermost periphery due to loosening of the film caused by rotation of the supply spool in the film extrusion direction. The drive force is applied to the film in the extrusion direction, thereby making it possible to extrude the film from the film cartridge. Hereinafter, this type of film cartridge in which the film can be ejected by rotating the supply spool will be referred to as a push-out film cartridge.

Figures 24 to 26 are views showing this extruded film cartridge, with Figure 24 being a longitudinal cross-sectional view, Figure 25 a cross-sectional view, and Figure 26 a side view of the main parts.

In these figures, 301 is a film, 302 is an extruded film cartridge, 303 is a film passing slit, 304 is a supply spool, and 304a is a film 30.
A fixing part for fixing one end of 1, 305 is a holding member, 305
306 is a release portion, and 307 is a guide portion.

If this extrusion type film cartridge 302 is used, after loading it into the camera, the supply spool 304 of the cartridge 302 is rotated with a fork, and the film 3]
1, the film 301 is pushed out until it is wound around the camera's film take-up spool, and then the re-film 301 is fed to the film take-up spool. Since there is no need to touch the tip of 301, the drawbacks of the conventional method are eliminated.

In recent years, some films housed in this type of film cartridge are equipped with a magnetic storage section on which information can be written or read by a magnetic head. An example of this is a camera that uses a magnetic head to write shooting information such as shutter speed, aperture value, date, title, etc. into the magnetic storage section, or to read out film sensitivity, etc. that has already been written, and is patented in the United States. No. 4864332
Disclosed in the issue etc.

By the way, for example, when writing or reading information unique to each photographic frame of the film, the film has already been pushed out sufficiently from the film cartridge, so no problem occurs in carrying out the above operation. However,
When reading information from a film that is not unique to each frame but is common to a single film, such as film sensitivity, film number information, or film unused/used information, there are the following problems. Ta.

It is desirable that the information common to one film is recorded near the leading edge of the film before the photographic frame. In this case, it is possible to physically make a hole or the like on the film to make the dedicated location of the above information known, but considering that information can be written magnetically even before that, it is possible to make the magnetic recording part of the film known. seems to be not being used effectively. Furthermore, a means for detecting holes, etc. is also required, which leads to an unnecessary increase in costs. Furthermore, when considering the timing of pressing the magnetic head against the film surface using a pad or the like, and considering the mechanical time lag, a read error may occur from the time the hole is detected to the time when the magnetic head is pressed. On the other hand, if pressure is applied too quickly, before the film is wound around the film take-up spool, the extrusion load on the film will increase and there is a possibility that film feeding will fail.

(Objective of the Invention) The object of the present invention is to solve the above-mentioned problems, and to make it possible not only to effectively use the magnetic storage section provided in the film, but also to write or read information at an appropriate timing. It is an object of the present invention to provide a camera using a film with a magnetic storage unit capable of performing the following.

(Features of the Invention) To achieve the above object, the present invention is arranged near an aperture, and while the film take-up spool starts feeding the film, the film is fed at a speed slower than the film feeding speed. A film feeding means for feeding, a speed detection means for detecting the moving speed of the film from the rotation of the film feeding means, and a large speed change detected by the speed detection means after film winding is started. and a magnetic head control means for driving the magnetic head by determining that the film has been wound on the film take-up spool by detecting a large speed change by the speed detection means. Accordingly, the magnetic head is immediately driven to start writing or reading information.

(Embodiments of the Invention) Hereinafter, the present invention will be described in detail based on illustrated embodiments.

11 to 16 are diagrams showing a mechanical configuration according to an embodiment of the present invention, in which FIG. 11 is a perspective view of a film feeding mechanism, FIG. 12 is a plan view of a gear train at the time of film winding, Fig. 13 is a plan view of the gear train during film rewinding, Fig. 14 is a longitudinal cross-sectional view of the one-way clutch section, Fig. 15 is a cross-sectional view thereof, and Fig. 16 is a cross-sectional view of the main parts of the camera. .

In these figures, reference numeral 1 denotes a film drive motor, which rotates in the normal direction (in the direction of arrow C in FIG. 13) when winding the film and rotates in the reverse direction (in the direction of arrow C in FIG. 13) when rewinding the film. 2 is a pinion gear fixed to the rotating shaft of the motor 1. 3 is a first sun gear, which is connected to the pinion gear 2;
It meshes with the. 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 rotatably holds the first planetary gear while generating frictional force between the first planetary gear 4 and the first planetary gear 4; This is a first connection lever in which the rotation of the first sun gear 3 causes the first planetary gear 4 to revolve around the first sun gear 3 as the rotation center. The first sun gear 3, first planetary gear 4, and first connection lever 5 constitute a known planetary gear mechanism.

Reference numeral 6 denotes a spool gear that meshes with the first planetary gear 4 only when the film drive motor 1 rotates normally. A film take-up spool 7 is fixed to the spool gear 6 and moves integrally with the spool gear 6.

8 is a first idler gear that always meshes with the first sun gear 3; 9 is a first two-stage gear that has a large gear portion 9a and a small gear portion 9b, and the large gear portion 9a meshes with the first idler gear 8; , 10 is a small gear portion 9b of the first two-stage gear 9
11 is a third idler gear that meshes with the second idler gear 10; 12 is a second sun gear that meshes with the third idler gear 11;
13 is a second planetary gear that meshes with the second sun gear 12. 14 is a third planetary gear, which, like the second planetary gear 13, meshes with the second sun gear. 15
The second sun gear 12, second planetary gear 13, and third planetary gear 14 are connected by arms 15a and 15b, respectively, and each planetary gear is held rotatably while generating frictional force. This is a second coupling lever in which the rotation of the second sun gear 12 causes the second planetary gear 13 and the third planetary gear 14 to revolve around the second sun gear 12 with the second sun gear 12 as the rotation center. Said second sun gear 12 and 2.3
With the planetary gears 13, 14 and the second connecting lever 15,
It constitutes a known planetary gear mechanism.

16 is the fourth idler gear, which is connected to the film drive motor 1.
During normal rotation, the second sun gear 12 of the second coupling lever 15
When the motor 1 rotates in the left direction around , it engages with the second planetary gear 13 and does not engage with the third planetary gear 14. When the motor 1 rotates in reverse, the third coupling lever 15 rotates in the right direction. It meshes with the planetary gear 14 and the second planetary gear 13
The gears do not mesh with each other. 17 is a second two-stage gear which has a large gear part 17a and a small gear part 17b, and the large gear part 17a meshes with the fourth idler 16; 18 is a large gear part 18
a and a small gear part 18b, the large gear part 18a meshes with the small gear part 17b of the second two-stage gear 17; 19 is the small gear of the third two-stage gear 18; Part 18
a fork gear meshing with b; 20 is the fork gear 1;
A fork that rotates integrally with the fork 9 rotates the supply spool in the film cartridge 33 (see FIG. 16), thereby extruding and winding the film 34 from the cartridge 33.

21.22.29 (see Figure 14) is a one-way clutch, 21 is a gear that meshes with the second sun gear 12, 2
As shown in FIG. 15, 2 is a ratchet gear in which a full-circumference pawl portion 22a is formed on the inside and a gear 22b is formed on the outside; 29 is a ratchet pawl member, and the pawl portion 29 has elasticity;
b, and its claw portion 29b engages with the claw portion 22a of the ratchet gear 22. The relative speed of the ratchet pawl member 29 with respect to the ratchet gear 22 is in the direction of the arrow (12th
(see figure), this ratchet pawl member 29
When the relative speed is opposite to the direction of the arrow, the pawl portion 29b bends and slides on the pawl portion 22a, and the ratchet pawl member 29 transmits the driving force to the ratchet gear 22. I can't tell you. The ratchet pawl member 29 has a pin 29a as shown in FIG. 14, and the pin 29a fits into the hole 21c of the gear 21.
The ratchet pawl member 29 and the gear 21 always rotate together. Reference numeral 30 denotes a base plate (not shown), on which the gear 21, ratchet claw member 29, and ratchet gear 22 (21b, 29c, 22c) are rotatably fitted, respectively, as shown in FIG. 23 is a roller member fixed to the ratchet gear 22, and the outer peripheral portion 23'a has a structure such as rubber or knurling to prevent slipping.

24 is a pulse gear, and the gear portion 22 of the ratchet gear 22
meshes with b. A pulse plate 25 has a conductive part 25a and a non-conductive part 25b, and is fixed on the pulse gear 24. 26 and 27 are contact pieces, which connect the conductive portion 25 of the pulse plate 25.
This is a contact piece for detecting pulses corresponding to the amount of rotation of the roller member 23 using the non-conducting portion 25a and the non-conducting portion 25b.

Reference numeral 28 denotes a stopper (see FIG. 13) fixed to a base (not shown), which restricts the counterclockwise rotational position of the first connecting lever 5 by coming into contact with the end 5a of the first connecting lever 5. There are things.

31 is a main body (see FIG. 16), 32 is a pressure plate, 35 is a cartridge chamber, and 36 is a spool chamber.

A magnetic head 48 is attached to the pressure plate 32.

The roller member 23 mentioned above is arranged as shown in FIG.
In order to stably contact the magnetic head 48 (the magnetic gap portion thereof), the magnetic head 48 is attached in advance so as to apply a predetermined pressure, or the film 34 is attached between the magnetic head 48 and the roller member 23. When passing between the magnetic head 48 and the roller member 2, a predetermined pressure is applied to the magnetic head 48 depending on the thickness of the film 34.
It is installed with a gap between it and 3. As can be seen from the above, the roller member 23 constitutes one film feeding system, and rotates as the film 34 moves, and in conjunction with this, the pulse plate 25 also rotates through the gear 22. The contact pieces 26 and 27 generate pulse signals.

In the above configuration, after the film cartridge 33 is loaded into the cartridge chamber 35, when the film drive motor 1 (pinion gear 2) is rotated in the direction of arrow B (normally rotated) as shown in FIG. The first sun gear 3 rotates clockwise, and the first planetary gear 4 revolves clockwise around the first sun gear 3 due to the action of the first coupling lever 5. Eventually, it meshes with the spool gear 6, the driving force of the film drive motor 1 is transmitted to the spool gear 6, and the film take-up spool 7 begins to rotate clockwise.

Further, the driving force is transmitted through an idler gear 8, which is another gear that meshes with the first sun gear 3, to a second gear through a first two-stage gear 9, a second idler gear 10, and a third idler gear 11. is transmitted to the sun gear 12. Therefore, since the second sun gear rotates counterclockwise, the action of the second coupling lever 15 causes the second planetary gear 13,
The third planetary gear 14 revolves counterclockwise around the second sun gear, and soon the second planetary gear 13 moves to the fourth planetary gear.
It comes to mesh with the idler gear 16 of. As a result, the driving force of the film driving motor 1 in the B direction is
The driving force is transmitted to the idler gear 16 as a counterclockwise driving force, and is further transmitted to the fork gear 19 via the second two-stage gear 17 and the third two-stage gear 18, so that the fork 2o rotates clockwise.

Furthermore, as the second sun gear rotates as described above, a driving force in the clockwise direction (in the direction of the arrow) is applied to the gear 21 that meshes with the second sun gear 12, so that the film is wound on the spool 7. Gear 21 until it arrives. Ratchet gear 22. Due to the action of the one-way clutch composed of the ratchet pawl member 29, the one-way clutch rotates integrally (details will be described later), and accordingly, the roller member 2
3 will also rotate clockwise. As the ratchet gear 22 rotates, the pulse gear 24 meshing with it also rotates, and the pulse plate 25 and contact pieces 27, 26 generate a pulse signal corresponding to the amount of rotation of the roller member 23, as shown in FIG. Encoder circuit shown in (described later)
The rotational speed and amount of rotation of the roller member 23 at that time (feeding speed and amount of the film 34), etc. are determined.

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

If the peripheral speed of the film take-up spool 7 is "■1", the peripheral speed of the roller member 23 is rV2J, and the speed of the film 34 pushed out from the film cartridge 33 by the fork 20 is "v3", then rV 1 >V2>V3J There is a relationship between

When the film 34 is pushed out from the film cartridge 33 by the clockwise rotation of the fork 20,
Since the roller member 23 is configured to constantly press the magnetic storage portion of the film 34 against the magnetic head 48,
The leading edge of the film contacts the roller member 23 and the magnetic head 48.

Here, according to the configuration of this embodiment, since the roller member 23 is rotating clockwise, the film 34 and the roller member 2
The frictional force of 3 allows the leading edge of the film to be smoothly fed from the cloth to the left in FIG. Moreover, since the rotational speed is configured as rV2>V3J, when the film 34 is fed out by the roller member 23 after this,
The driving force (speed) is transmitted through the film 34 to the fork gear 19, the third two-stage gear 18, the second two-stage gear 17, and the fourth idler gear 16 in this order, and then to the second planetary gear 1.
3 clockwise rotational speed than the fourth idler gear 16
The rotation speed in the counterclockwise direction becomes faster, but at this time, the fourth idler gear 16 jumps the second planetary gear 13,
The second planetary gear 13 and the fourth idler gear 16 are momentarily disengaged, and the speed difference is absorbed.

The film 34 is further fed out, and the film 34
When the film 34 is wound around the film take-up spool 7 by hooking the perforations of the main body or pressing the film 34 against the film take-up spool 7 provided on the main body side, due to the relationship rV 1 > V 2 > V 3 J. The roller member 23 is rotated by the frictional force with the film 34, and the roller member 23 rotates faster than the gear 21. However, due to the action of the one-way clutch mentioned above, the rotational force of the roller member 23 is rotated faster than the gear 21. Also, at this time, the pulse plate 25 and contact pieces 26, 2
Based on the pulse signals generated at 7 and 7, the feeding amount, speed, etc. of the film 34 can be determined by the encoder circuit shown in FIG. Furthermore, since the relationship rV 1 >V2J exists, the feeding speed changes greatly when the film 34 is wound around the film take-up spool 7. By focusing on this speed change, it is possible to determine whether autoloading has finished or not. It is also possible to determine whether or not.

Next, the operation when rewinding the film will be explained.

To explain this operation with reference to FIG. 13, when the film drive motor l is rotated in the direction of arrow C, the first connecting lever 5
The first planetary gear 4 revolves around the first sun gear 3 in a counterclockwise direction until the end 5a of the first connecting lever 5 comes into contact with the stopper 28. Therefore, the first planetary gear 4 and the spool gear 6 are disengaged.

Also, at this time, the second sun gear 12 rotates clockwise,
As a result, the second planetary gear 13 and the third planetary gear 14 are connected to the second sun gear 12 by the action of the second connection lever 15.
The fourth idler gear 16 and the second planetary gear 13 are disengaged, and the fourth idler gear 16 and the third planetary gear 14 are engaged instead.

Therefore, the fork gear 19 rotates counterclockwise, and the fork 20 causes a supply spool (not shown) inside the film cartridge 33 to rotate in the opposite direction, so that the film 34 is wound into the cartridge 33.

At this time, the roller member 23 is rotated counterclockwise by the film 34, but the second sun gear 12
Since the speed at which the gear 21 is rotated counterclockwise is high, the relative speed of the gear 21 to the ratchet gear 22 is counterclockwise (
(in the opposite direction to the direction of the arrow), the driving force is not transmitted from the ratchet gear 22 to the gear 21 due to the one-way clutch mechanism.

As the film 34 is wound into the film cartridge 33 in this way, the leading edge of the film eventually passes through the roller member 23 and the roller member stops rotating, so there is no pulse between the pulse plate 25 and the contact piece 2627. After the signal is no longer generated and the film rewinding operation continues for a certain predetermined time, the motor is stopped and the film rewinding operation is completed (details will be described later).

The results of detecting the feed amount and speed of the film 34 are used, for example, to synchronize with the magnetic head 48 during magnetic recording and to perform desired magnetic storage at a predetermined position in the magnetic storage section. Furthermore, it can also be used to control the feeding of one frame of film 34 and to write information using optical means such as LEDs.

FIGS. 17 and 18 are diagrams showing other configuration examples of the one-way clutch mechanism consisting of the aforementioned 21.2229. FIG. 17 shows the state during film winding, and FIG. 18 shows the state during film rewind. FIG. 3 is a plan view showing a gear train.

In these figures, 42 is a third sun gear that meshes with the second sun gear 12, and 43 is a fourth planetary gear that meshes with the third sun gear 42.

44 connects the third sun gear 42 and the fourth planetary gear 43, and when the third sun gear 42 rotates counterclockwise, the fourth planetary gear 43 connects the third sun gear 42. The third sun gear 42 revolves counterclockwise as the rotation center.
This is a third connecting lever that causes the fourth planetary gear 43 to revolve clockwise when rotated clockwise. 45 is a gear that meshes with the fourth planetary gear 43, and the roller member 2
3 are integrally attached. Further, this gear 45 meshes with the pulse gear 24. 46 is a stopper that restricts the counterclockwise rotation of the third connecting lever 44.

As in the above-described embodiment, the circumferential speed of the film take-up spool 7 and the roller member 23 and the speed of the film 34 pushed out by the fork 2o are set as rV 1 >V2>V3J.
is wound on the film winding Lisbourg 7, the gear 45 receives a driving force in a clockwise direction through the roller member 23 at a speed higher than that transmitted from the third sun gear 42, but at this time, the gear 45 receives a driving force from the fourth planetary gear. 43 in the direction of the arrow, the speed difference is absorbed.

When rewinding the film, the third sun gear 42
Since the meshing between the planetary gear 43 and the gear 45 is released (
18), the film 34 is wound into the film cartridge 33 by the fork gear 19.

Furthermore, in FIG. 19, the film feeding amount is detected using the pulse plate 25 and the contact piece 2627, but here an example is shown in which the film feeding amount is detected optically using a photointerrupter or the like using the pulse gear 24. ing.

In FIG. 19, 48 is a photointerrupter, 47 is a slit disk made of a light-shielding material, and is fixed to the pulse gear 24, and has a slit 47a formed therein.

In the above configuration, the photointerrupter 47 detects the slit 47a and generates a pulse signal according to the amount of rotation of the roller member 23.

Further, the shape and mounting position of the roller member 23 as a film pressing member are desirable as described below.

FIG. 20 is a cross-sectional view of the magnetic head 48 and the roller member 23, where 48a is the magnetic gap, 48b is the core, and 48c is the magnetic gap.
is the coil.

That is, in this embodiment, since the roller member 23 is configured to rotate even when the film 34 is not on the 1iff air head 48, the dust (shavings) generated at that time may be removed from the magnetic gap 48a of the magnetic head 48. Since it is conceivable that the magnetic gap 48a may get stuck or the magnetic gap 48a may cause friction, it is preferable to use a shape as shown in FIG. 21, for example.

FIG. 21 is a diagram showing a longitudinal section, and 49 is a roller member, which is composed of a large diameter part 49a and a small diameter part 49b, and the large diameter part 49a
The small diameter portion 49b is in contact with a portion other than the core 48b of the magnetic head 48 or the magnetic gap 48a provided at its tip, that is, the magnetic gap 48a, the core 4
A portion facing 8b is a small diameter portion 49c to prevent direct contact between the roller member and the magnetic gap.

Further, as shown in FIG. 22, the roller member 50 is arranged so that the roller member 50 comes into contact with the magnetic gap 48a at a location other than the magnetic gap 48a.
0 and the magnetic gap 48a may be shifted by an interval.

Furthermore, if the installation is in the position shown in Figure 22 above,
As shown in FIG. 23, the roller member 50 is urged in the direction of the magnetic head 48 by an elastic means such as a spring so as to press the magnetic storage portion of the film 34 against the magnetic head 48 with a stable force. This is desirable.

In FIG. 23, 51 is a fourth coupling lever that is rotatable around the second sun gear 12 and that rotatably holds the gear 21 and engages the gear 21 and the second sun gear 12. It can operate completely independently of the second connection lever 15. 52 has one end attached to a ground (not shown) and the other end attached to the fourth interlocking lever 51, and pushes the roller member 50, gear 21, etc. in the direction of arrow E, that is, the roller member 5o against the magnetic head 48 with a constant force. It is biased to attach.

FIG. 1 is a block diagram showing one embodiment of the present invention.

In FIG. 1, reference numeral 101 denotes a photometer for measuring the brightness of a subject to be photographed, and numeral 102 denotes a distance measuring means for measuring the distance to the subject in order to focus the photographic lens.

A microcomputer (hereinafter referred to as microcomputer) 103 controls the operations of various circuits. Reference numeral 104 denotes a switch that is turned on in conjunction with the first stroke of a release button of a camera (not shown), and is hereinafter referred to as switch sw1. 105 is a switch that is turned on in conjunction with the second stroke of the release button, and hereinafter this will be referred to as release switch SW2. 1.6 is a back cover switch that is linked to the opening and closing of the back cover, and 107 is a cartridge presence/absence switch whose state changes depending on whether or not the film cartridge 33 is loaded in the cartridge chamber 35.

108 is the pulse plate 25 and contact piece 26 shown in FIG.
This is an encoder circuit that detects the pulse signal generated by the roller member 27, and is used as information for determining the rotational speed and amount of rotation of the roller member 23 (feeding amount of the film 34). 109 is a motor control means for controlling the rotation of the film feeding motor 1;
The film is wound up by normal rotation (rotation in the direction of arrow C in FIG. 13), and the film is rewound by reverse rotation (rotation in the direction of arrow C in FIG. 13). 110 is a shutter control means;
Controls exposure to film. Reference numeral 111 denotes a lens control means, which controls the lens barrel based on information from the distance measuring means 102 so that the subject is in focus. 112
11 is a head control means for controlling the writing or reading of information into or from a magnetic storage section (not shown) provided on the film 34 using the magnetic head 48 shown in FIG. 11 and the like.

FIG. 2-1 and FIG. 2-2 are flowcharts showing the operation of the microcomputer 103, and the operation will be explained below according to these.

"Step 1" It is determined whether the back cover of the camera is closed based on the state of the back cover switch 106, and when it is determined that the back cover is closed, the process proceeds to step 2.

"Step 2" The film cartridge 33 is inserted into the cartridge chamber 35 according to the state of the cartridge presence/absence switch 107.
It is determined whether or not it has been loaded, and by determining that it has been loaded, the process proceeds to step 3.

"Step 3" Since the film cartridge 33 has been loaded, a winding start signal is sent to the motor control means 109 here. This causes the film drive motor 1 to switch to the first
As shown in FIG.
Extrusion from No. 3 is started.

"Step 4" By inputting a pulse signal corresponding to the rotation of the roller member 23 from the encoder circuit 108 and performing calculations with an internal clock signal, the roller member 23
The rotational speed V and acceleration of where N is the number of counts of the pulse signal in a predetermined period of time. Alternatively, if the time interval between pulse signals is T, then the following equation is obtained.

"Step 5" It is determined whether or not the rotational acceleration of the roller member 23 obtained in step 4 above is changing rapidly. Determine that it has been rolled up and proceed to step 1
Go to 00.

Here, due to the sudden change in the rotational acceleration of the roller member 23, the film 34 is moved to the film take-up spool 7.
The reason why it is determined that it has been wound up will be explained below.

The relationship between the feeding speed of the film 34 and the rotational speed of the roller member 23 is shown in FIG.

In FIG. 3, film winding (extrusion) is started at time T after the film cartridge 33 is loaded. The portion shown by a thin solid line is the rotational speed of the roller member 23, and the portion shown by a broken line is the moving speed of the leading end of the film during extrusion by the fork drive. In reality, there is some speed fluctuation due to load fluctuations, but this is not shown in the diagram as it can be ignored from the perspective of the whole.

The period from time T0 to T1 is the period of film extrusion,
A delay ('rt') occurs in the start of movement due to absorption of loosening of the film 34 within the film cartridge 33. The period from time T1' to T1 is the period during which the fork 20 actually pushes out the film 34, and the rotational speed of the fork 20 determines the film feeding speed during this period. During this time,
The roller member 23 rotates at a speed determined by the rotation of the film drive motor 1 and the gear ratio of the driving force transmission gear train up to the roller member 23.

The leading edge of the film reaches the roller member 23 at time T1, and thereafter the film 23 is drawn out according to the rotational speed of the roller member 23 until it reaches the film take-up spool 7. At this time, as mentioned above, the fork 20
The film extrusion drive will be invalidated.

The leading edge of the film is fed to the film take-up spool 7 from time T1 to T2, and the film 34 is wound around the film take-up spool 7 at time T2. That is, a sudden change in the speed of the roller member 23 means that the film 34 is wound around the film take-up spool 7 and begins to rotate at a speed according to the spool 7. Thereafter, the film is wound up to a predetermined position (the position where the first frame reaches the aperture portion) according to the rotational speed of the film take-up spool 7. At this time, the driving force of the roller member 23 also becomes invalid.

When the first frame reaches a predetermined position, the motor control means 109 stops winding the film, and at time T3, the film take-up spool 7 also stops. Further, when the shooting of the first frame is completed, winding of the film starts from time T4 toward the second frame.

Further, in this step 5, when the rotational speed of the roller member 23 is not changing rapidly, the process proceeds to step 6.

"Step 6" The rotation speed ■ of the roller member 23 is approximately r
It is determined whether it is OJ or not, and if it is "o", it is determined that the leading end of the film is caught somewhere and the rotation of the motor 1 has stopped, and that the fork 20 and roller member 23 are not rotating. Proceed to step 8. Further, if rotation of the roller member 23 is confirmed, the process proceeds to step 7.

"Step 7" It is determined whether or not a predetermined time ta has elapsed since the start of film winding. If the predetermined time ta has not been exceeded, the process returns to step 4. On the other hand, if no increase in the rotational speed of the roller member 23 due to the winding of the film around the film take-up spool 7 is detected even after the predetermined time ta has elapsed, the process proceeds to step 8. Note that the predetermined time ta is the third
This time is slightly longer than the time interval between time T and time T2 in the figure. In other words, this is the time expected to be sufficient from the start of film extrusion until the film is wound around the film take-up spool 7. That is, if the predetermined time ta or longer is exceeded, it may be considered that autoloading has failed.

"Step 8" In order to try film winding (extrusion) again, the film 34 is temporarily moved to the film cartridge 33.
Begin the action of rolling inward. That is, the motor control means 1
09 to start rewinding the film. Then return to step 3.

Further, in step 5, if the rotational speed of the roller member 23 suddenly changes (the state at time T2 in FIG. 3), the process proceeds to step 100 as described above.

"Step 100" In order to read information such as the specified number of films and film sensitivity written in the magnetic storage section of the film 34, the magnetic head 48 is driven via the head control means 112 to start reading or writing information. .

"Step 9" The encoder circuit 108 detects the value of the pulse signal that is counted.

"Step 10" Here, the encoder circuit 108
Based on the count contents, it is determined whether the first frame has arrived at the aperture area or not, and the process continues in step 9 until the first frame reaches the aperture area.
Repeat step 10. When it is determined that the first frame has reached the aperture portion, the process proceeds to step 11.

"Step 11" Here, the drive of the film drive motor 1 is stopped via the motor control means 109, and the winding of the film is stopped.

When the above operations are completed, the flow advances to step 12 in FIG. 2-2.

"Step 12" Here, it is determined whether the first stroke of the release button has been made and the switch SWI has been turned on. The process proceeds to step 13 by determining whether the switch SWI is on.

"Step 13" Drive the photometric means 101 to measure the brightness of the subject (obtain photometric information).

"Step 14" The distance measuring means 102 is driven to calculate distance information (distance measurement information) to the subject.

"Step 15" Here, it is determined whether the second stroke of the release button has been made and the release switch SW2 has been turned on. If it is determined that the release switch SW2 is turned on, the process proceeds to step 17, and if it remains off, the process proceeds to step 16.

"Step 16" Here, as in step 12, it is determined whether the switch SWI is on or not. If it is off, the process returns to step 12, and if it remains on, step 15
The process returns to and waits for the release switch SW2 to be turned on.

[Step 17J: Drive the lens control means 111 based on the ranging information obtained in step 14 above to move the photographing lens to the in-focus position.

"Step 18" Based on the photometric information obtained in step 13, the shutter control means 110 is driven to control exposure to the film 34.

"Step 19" In order to position the next frame in the aperture area, winding of the film is started via the motor control means 109 and the film drive motor 1.

"Step 20J: A pulse signal is input from the encoder circuit 108, and the rotation speed V and rotation amount (film feeding amount) of the roller member 23 are calculated.

"Step 21" Determine whether the rotational speed of the roller member 23 obtained in step 20 above is approximately rOJ,
If it is not "o", that is, if the film is in the middle of being wound, the process advances to step 22.

"Step 22" It is determined whether the count in the encoder circuit 108 has reached the amount of feeding one frame of film. If not, the process proceeds to step 101.

"Step 101" Here, the writing frequency for recording information to the photographic frame is determined based on the pulse signal from the encoder circuit 108 (details will be described later).

"Step 1o2" Information is written into the magnetic storage portion of the film 34 being fed by the magnetic head 48 via the head control means 112 in accordance with the above writing frequency.

Further, in step 22, the encoder circuit 10
If it is determined that the count at step 8 has reached one frame of film, the process advances to step 23.

"Step 23" The drive of the film drive motor 1 is stopped via the motor control means 109, and the winding of the film is stopped. Step 1 to prepare for the next shoot
Return to 2.

Further, in step 21, if the rotational speed of the roller member 23 is approximately 0, it is assumed that the film has finished and has been stretched, and that all frames have been photographed, and the process proceeds to step 24.

"Step 24" The drive of the film drive motor 1 is stopped via the motor control means 109, and the winding of the film is stopped.

"Step 25" Here, in order to start rewinding the film (winding it into the film cartridge 33), the film drive motor 1 is driven in the direction of arrow C in FIG. 13 via the motor control means 109.

"Step 26" A pulse signal is input from the encoder circuit 108, and the rotational speed V of the roller member 23 is calculated.

"Step 27" It is determined whether the absolute value of the rotational speed V of the roller member 23 obtained in the above step 26 is greater than "0", and if it is low OJ, the process returns to the step 26 and the roller member 23 is again Calculate the rotation speed V of No. 23. Thereafter, if the rotation of the roller member 23 is detected to be larger than rOJ, the process proceeds to step 28.

The determination flow in step 27 is provided because if the film 34 wound around the film take-up spool 7 is loosened during initial rewinding, the roller member 2
3, because there is a delay in the movement of the film 34 being transmitted,
This is to avoid confusing this with the end of film rewinding.

"Step 28" A pulse signal is input from the encoder circuit 108, and the rotation speed V of the roller member 23 is calculated.

"Step 29" Determine whether the rotational speed V of the roller member 23 obtained in step 28 is "0" or not, and if it is not "O", return to step 28 and repeat the same operation until rOJ is reached. repeat.

Thereafter, if it is determined that the rotation speed V of the roller member 23 is "0", that is, the rotation of the roller member 23 has stopped, it is determined that the leading edge of the film has passed the position of the roller member 23, and the process proceeds to step 30.

"Step 30" Here, a timer that counts a predetermined time tc is started.

"Step 31" Film rewinding is stopped by confirming that the predetermined time tc has elapsed.

"Step 32" It is determined whether or not the film cartridge 33 has been taken out from the cartridge chamber 35 based on the state of the cartridge presence/absence switch 127. When it is determined that the film cartridge 33 has been taken out, the process returns to step 1 in FIG. 2-2.

FIG. 4 is a diagram in which the rotational speed of the roller member 23 during film rewinding is shown as a solid line.Rewinding starts at time T5, and the leading edge of the film has passed the position of the roller member 23 at time T. In the film rewinding direction, the roller member 23 immediately stops due to the friction with the opposing surface. The broken line is the moving speed of the leading edge of the film.

Figure 5 shows that in step 5 of Figure 2-1, it was determined whether autoloading was successful by looking at the change in acceleration, but as a modification of this, the determination can be made based on the change in average speed. Indicates when to do so.

In FIG. 6, step 3' is provided between step 3 and step 4 in FIG. This is another example in which erroneous determination due to changes in acceleration or speed of the film drive motor 1 at startup is avoided.

FIG. 7 is a circuit diagram showing a specific example of the configuration of the head control means 112 shown in FIG. 1.

In FIG. 7, 2301 is a switching means for connecting the magnetic head 48 to an information reading circuit system or a writing circuit system, and is controlled by an R/W signal. This R/
The W signal is sent from the microcomputer 103,
It is at a high level when reading information. 2302
is a differential amplifier for reading information, and the magnetic head 48
The voltage generated by the 8th
It outputs signals F and G as shown in the figure. 2303 is the signal F.

G is human power, and the output is a signal H9■ as shown in Figure 8.
This is a comparator that generates a digital signal, and is composed of a comparator with hysteresis. 2304
shapes the output signal HI of the comparator 2303 into the signal waveform shown in J in FIG.
This is a waveform shaping circuit that outputs as ATA. 2305 is a driver for writing information, which sends WRITE DATA (signal K) from the microcomputer 103 to the magnetic head 48.
This is a circuit that changes the write current to .

FIG. 9 shows the output signal M of the driver 2305 in response to WRITE DATA (signal K) and the R/W signal that controls the switching means 2301.

FIG. 10 is a circuit diagram for explaining in terms of hardware the method for determining the write frequency performed in step 101 of FIG. 2-2.

In FIG. 10, 2601 is an oscillator that determines the write frequency, and the frequency is controlled by the output of a latch 2602.

The information recording method here is a self-clocking method, and to explain it with the signal in FIG. 9, a rising edge is a clock signal and indicates a division of information. In other words, the falling edge is a data signal, and if the high-level pulse width is less than 1/2 for one cycle of the clock signal, it is one logic level, and if it is greater than 1/2, it is the opposite logic level. It shows the level of logic. Therefore, the ninth
The signal in the figure includes, for example, the time series WR of ro 111J.
This means that the ITE DATE signal has been input.

The latch 2602 samples the signal obtained by processing the output of the encoder circuit 108 at the timing of the latch 2603. That is, after the reset signal of the AND gate 2607 is output, the output terminal Q of the counter 26o6
1 becomes a high level. Actually, it is latched when the reset signal rises. This is because the reset signal is synchronized with the rise of the clock signal, which is one cycle of the write signal, and if the write frequency is higher than the synchronization of the output of the encoder circuit 108, the frequency change within one cycle is This is because errors are likely to occur in the signal.

The counter 2606 counts the pulses of the oscillator 2601, and the output terminals Qn and Qn+ of the counter 2606 count the pulses of the oscillator 2601.
The logical product of 1 is output from the AND gate 2607, and this is used as the CLO for writing information, for example, to advance the RAM address.
It is used as CK, as a reset signal for latch 2611, and also as the rising edge of WRITEDATA in latch 2611. The falling edge is, for example, RAM
Depending on whether DATA is at high level or low level, either one of 2608 and 2609 is selected, and the timing of the output terminals Qn and Qn+1 is selected, respectively, and the latch 2611 is set through the OR gate 2610, so that the falling edge The position of is controlled. Assuming that the logical result of the outputs of output terminals Qn and Qn+1 is "1", Qn has a width of 1/3 and Qn+1 has a width of 2/3.

According to this embodiment, a roller member 23 is provided as one of the film feeding means, and the roller member 23 feeds the film at a speed slower than the film feeding speed by the film take-up spool 7. In other words, film 3
Means for detecting the moving speed of 4 (pulse plate 25, contact piece 26
, 27, encoder circuit 108) is obtained by interlocking with the rotation of the roller member 23, and by this means, the film feeding speed is suddenly changed, so that the film winding spool 7
Since the magnetic head 48 immediately starts writing information when the film 34 is successfully wound, it is possible to effectively use the magnetic storage section provided in the film 34. Furthermore, this allows the magnetic head 48 to write or read information at appropriate timing.

(Modification) According to this embodiment, a type (hereinafter referred to as FR5 drive system) in which the fork, roller member, and film take-up spool are each driven as shown in FIG. 11 is shown. It is not limited to this, but the same effect can be obtained even with a type in which the fork and film take-up spool are driven to feed the film (this is generally called an FS drive system). I can do it. At this time, no driving force is transmitted to the roller member, and the film rotates due to the frictional force generated when the film contacts the roller member and moves.

In addition, this does not pose a problem when the roller member forms part of the film feeding system as in this embodiment, but in the case of a configuration in which the magnetic head and the film are brought into contact only when writing or reading information, for example, when the magnetic head is in contact with the film, The head can move forward and backward with respect to the film surface, and therefore, if the timing of driving the magnetic head is too early, the film feeding load will increase, but this problem is eliminated. Note that in this case, it is assumed that a normal film cartridge is used instead of a push-out type film cartridge. .

(Effects of the Invention) As explained above, according to the present invention, the film is disposed near the aperture, and while the film take-up spool starts feeding the film, the film is fed at a speed slower than the film feeding speed. A film feeding means for feeding, a speed detection means for detecting the moving speed of the film from the rotation of the film feeding means, and a large speed change detected by the speed detection means after film winding is started. and a magnetic head control means for driving the magnetic head by determining that the film has been wound on the film take-up spool by detecting a large speed change by the speed detection means. As a result, the magnetic head is immediately driven to start writing or reading information, which not only makes it possible to effectively use the magnetic storage section of the film, but also allows information to be read at the appropriate timing. It becomes possible to write or read.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a first embodiment of the present invention;
Figure-1 and Figure 2-2 are flowcharts showing the same operation, Figure 3 is a diagram showing the leading edge of the film and the speed of the roller member during autoloading, and Figure 4 is the leading edge of the film and the speed of the roller member during film rewinding. 5 and 6 are flowcharts showing a partial modification of FIG. 2-1, and FIG. 7 is a circuit showing a specific configuration example of the head control means shown in FIG. 1. 8 and 9 are diagrams showing the output waveforms of each part in FIG. 7, and FIG. 10 is a diagram showing the output waveform of each part in FIG. FIG. 11 is a perspective view showing the film feeding mechanism used in the embodiment of the present invention, FIG. 12 is a plan view showing the gear train when winding the film, and FIG. 13 is the same as the film winding mechanism. 14 is a plan view showing the gear train at the time of return, FIG. 14 is a vertical sectional view showing the one-way clutch mechanism shown in FIG. 11, and FIG. FIG. 16 is a cross-sectional view showing the configuration of the main parts of the camera according to the embodiment of the present invention, FIGS. 17 and 18 are plan views showing other examples of the roller member drive gear train, and FIGS.
FIG. 9 is a vertical cross-sectional view showing another configuration of the pulse signal generation part;
FIG. 20 is a plan view showing the positional relationship between the magnetic head and the roller member shown in FIG. 11, FIG. 21 is a longitudinal sectional view showing another positional relationship between the magnetic head and the roller member, and FIG. FIG. 23 is a plan view showing an example of the configuration of the film feeding gear train in the case of the positional relationship shown in FIG. 22; FIG. 24 is a plan view showing another positional relationship of the members; FIG. FIG. 25 is a longitudinal cross-sectional view of the extruded film cartridge, FIG. 25 is a cross-sectional view, and FIG. 26 is a side view. l...Film drive motor, 7...
Film winding spool, 20...fork,
23...Roller member, 24...Pulse gear, 25...Pulse plate, 25.26...
... Contact piece, 33 ... Extrusion type 7 type% ... Magnetic head, 49.50 ... Roller member, 1o3 ... Microcomputer, 108 ...・・・
... Encoder circuit, 109 ... Motor control means, 112 ... Head control means. 2-1 Figure 1 Figure 3 ToT+' ■1 6 I'm sad 'IT Figure 4 TfuB! Fig. 8 Fig. 9 Fig. 14 Fig. 15 Fig. 16 Fig. 48c Fig. 21 Fig. 22

Claims (1)

[Claims] (1) A film with a magnetic storage section that is equipped with a magnetic head that writes or reads information into a magnetic storage section of the film, and a film winding spool that winds up the film by transmitting driving force. a film feeding means disposed near the aperture and feeding the film at a speed slower than the film feeding speed while the film take-up spool starts feeding the film; A speed detection means detects the moving speed of the film from the rotation of the film feeding means, and the magnetic head 1. A camera using a film with a magnetic storage section, characterized in that it is provided with a magnetic head control means for driving the magnetic head.