JPH10148881A - Film feeding mechanism for camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a film feeding mechanism for a camera capable of preventing the adverse effect of a fine feed load fluctuation during a film feeding operation from being given to the recording/reproducing operation of a magnetic head and capable of reducing the occurrence of a magnetic recording miss. SOLUTION: As for the film feeding mechanism for the camera, a follower roller 13 which is rotated cooperatively with the film feeding operation at magnetically recording/reproducing is arranged on the upper stream side Su of the magnetic head 21 in the film feeding direction D, that is, the roller 13 is arranged on the side of a film cartridge 2, then, the film is pressed down by the follower roller 13 so that the adverse effect of the feed load unevenness in the film cartridge 2 may not be given to the magnetic head 21, and the occurrence of sagging is suppressed between the follower roller 13 and the magnetic head 21, thus, the magnetic recording miss is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film feeding mechanism for a camera which uses a film having a magnetic recording layer and magnetically records and / or reproduces photographing information and the like on the film. Regarding the configuration.

[0002]

2. Description of the Related Art In recent years, there has been proposed a camera system which uses a photographic film in which a transparent magnetic recording layer is formed on a part of a silver halide film and is capable of recording and reproducing various information on the magnetic recording layer. I have. In this type of camera, photographing data is magnetically recorded by a magnetic head built in the camera during one frame advance of the film after photographing. As a recording method, there is a digital recording method using a combination of binary values of data "1" and "0" so as to be less affected by noise.

FIG. 8 is a time chart showing the relationship between recording data "1" and "0" and a magnetic recording signal and the like in the digital recording system. The synchronous clock signal for magnetic recording shown in FIG. 8 is a signal generated by dividing a driven roller output signal output in synchronization with the film feeding movement into 32 parts. In the magnetic recording apparatus incorporated in the camera of Japanese Patent Application Laid-Open No. Hei 8-29857 proposed by the present applicant, magnetic recording is performed in synchronization with the above-described synchronous clock for magnetic recording, and one recording cycle T in the magnetic recording is performed. Applies a cycle of three synchronous recording clock signals for magnetic recording. The value of the recording data is represented by whether the time from the falling “↓” to the rising “↑” of the recording signal in one recording cycle T is longer or shorter than の of one recording cycle T. . That is, the pulse width t1 (off period) of the magnetic recording signal at data "1" is t1> T / 2 (1), and the pulse width t2 of the magnetic recording signal at data "0" (2) The off period is t2 <T / 2 (2).

As shown in FIG. 8, a magnetic head performs magnetic recording by generating magnetic fields "N" and "S" alternately in response to the magnetic recording signal, and a magnetic pole is formed on a magnetic recording layer on a photographic film. “N” and “S” are recorded.

Therefore, the data "1" and the data "0"
It is necessary to maintain the film feeding speed constant to perform magnetic recording that can accurately identify the feeding speed, or to accurately detect the feeding speed and create a synchronous clock for magnetic recording according to the feeding condition There is. However, it is extremely difficult to keep the feeding speed constant at all times in a situation where a compact camera and a low cost camera are required.

On the other hand, the magnetic recording method of a magnetic recording apparatus for a camera disclosed in Japanese Patent Application Laid-Open No. Hei 7-270892, which has been proposed as an application of a method for detecting the feeding speed, has a constant rate of change of the film feeding speed. When it exceeds the value, it is determined that jitter has occurred, and the film is rewound once,
This is a method for performing processing to perform magnetic recording.

Further, the magnetic recording method in a magnetic recording apparatus for a camera disclosed in Japanese Patent Application Laid-Open No. 7-219021 requires that when the film feeding speed is equal to or less than a reference value, the feeding speed fluctuates due to jitter. In this case, a method is adopted in which the magnetic recording density is reduced to prevent a recording error due to bit inversion from occurring.

Here, the structure of the above-described conventional camera or a film cartridge applied to a camera having a built-in film feeding mechanism according to an embodiment of the present invention, which will be described later, will be described with reference to FIGS. The photographic film (hereinafter, referred to as film) 1 accommodated in the film cartridge (hereinafter, referred to as cartridge) 2 includes:
A silver halide film provided with a magnetic recording layer, which is housed in a cartridge 2 up to a leader portion of the film 1 when the camera is not loaded, the film is fed out when the cartridge is loaded, and a take-up spool shaft on the camera side. It is a type of film that can be wound up.

FIG. 9 is an exploded perspective view of the cartridge, FIG. 10 is a sectional view of the cartridge, and FIG. 11 is a sectional view taken along line AA 'of FIG. FIG.
FIG. 4 is a development view of a film accommodated in the cartridge. As shown in FIG. 9, in the cartridge 2, the upper case 31 and the lower case 32
A pair of ribs 34 are formed on the inner walls of the upper case 31 and the lower case 32. The rib 34 is in contact with the outermost periphery of the film 1 to prevent loosening from the cartridge shaft 30. The upper case 31 and the lower case 32 have a port portion 31.
a, 32a are provided, and a film passage port 36 is formed at the joint of the ports 31a, 32a. Each port 3
A light-shielding lid 37 is incorporated between 1a and 32a.

The light-shielding lid 37 is rotatably supported by a rotation support portion 37a with both ends parallel to the cartridge shaft 30. A key groove 38 is provided at one end of the rotation support portion 37a, and is exposed on the side surface of the cartridge 2. The light-shielding cover opening / closing member 39 is engaged with the key groove 38 from the outside and is rotated, so that the film passage opening 3 is formed.
The light-shielding lid 37 can be rotated between a position where the shutter 6 is opened and a position where the shutter 6 is closed.

The cartridge shaft 30 has a shaft 42
Elastic flanges 41a and 41b are attached to the film 1, and one elastic flange 41a urges the film 1 in the longitudinal direction of the cartridge shaft 30 and is attached rotatably. The other elastic flange 41b sandwiches and biases the film 1 with the elastic flange 41a, and rotates integrally with the cartridge shaft 30 in the direction of feeding the film to the cartridge shaft 30, and becomes free to rotate in the opposite direction. It is so-called a one-way clutch.

The film reader 1d of the film 1 (FIG. 1)
When the cartridge shaft 30 is rotated in the film feeding direction while the cartridge shaft 30 is stored in the cartridge 2,
The film 1 sandwiched between the elastic flanges 41a and 41b is sent out of the cartridge 2 through the film passage port 36, and after engaging with a take-up spool shaft (not shown) on the camera side, the film 1 on the take-up spool side The film 1 is pulled out by the winding operation.

The cartridge shaft 30 has upper and lower shaft portions 43,
And a film insertion port 45 between the upper and lower shafts.
Are formed. The upper shaft portion 43 is separated at a center portion, and a pair of holding ribs 46 are integrally formed at a separated end portion. The holding rib 46 can move up and down by the elasticity of the resin forming the upper shaft 43. Lower shaft part 44
A pair of locking claws 47 located outside the holding rib 46
Are integrally formed, and the locking claws 47 also protrude into the film insertion opening 45.

A pair of locking holes 1 are provided at the rear end of the film 1.
b is provided. The rear end of the film 1 is inserted into the film insertion opening 45, and the locking claw 47 is engaged with the locking hole 1b, and is locked by the cartridge shaft 30 (see FIGS. 10 and 11). Then, the pressing rib 46 presses the film 1 so as not to come off from the locking claw 47 so that the rear end of the film does not come off. Therefore, the film insertion slot 4
5 does not come off even if a force is applied in the direction of pulling out the film 1. A locking hole 4 is provided at the rear end of the film 1.
A hole 49 is formed inside 8, and this hole 49 is used when the film 1 is inserted into the film insertion slot 45.

The above-described structure for preventing the film from coming off and the winding start state will be described with reference to FIG. 10 and FIG.
7 is formed, and the holding rib 46 is formed so as to face the locking claw 47 from the upper shaft portion 43. Therefore, the film 1 is pressed by the holding rib 46, and the film 1 is prevented from coming off.

The film 1 is wound around the cartridge 2,
To accommodate, insert the rear end of the film 1 into the film
5 and the locking claw 47 is engaged with the locking hole 1b.
The film 1 locked by the locking claws 47 starts to be wound around the lower shaft portion 44 of the cartridge shaft 30. The film 1
As shown in FIG. 11, the winding start portion 50 inflates due to the bending rigidity of the film. That is, the film 1 pressed by the holding rib 46 is formed at a lower angle with the lower shaft portion 4 at a more acute angle than the portion of the film 1 locked by the locking claw 47.
4, the winding start portion 50 bulges into a substantially elliptical “distorted” state due to the bending rigidity of the film.

FIG. 1 is a development view of the film 1.
As shown in FIG. 2, there is a magnetic recording area 4 formed of a magnetic recording layer on the upper side of the photographing screen 3 of the film 1, and on the lower side,
The photographing screen 3 is provided with a pair of perforations 5 and 6. A notch 1a used at the time of feeding is provided in a leader portion at the leading end of the film 1, and the leading end is inclined so that the film 1 has a shape that is easy to feed.

FIGS. 13 and 14 are cross-sectional views of the cartridge showing the state in which the film 1 in the cartridge 2 is wound. In the winding start portion of the film 1 when the film 1 is wound many times as shown in FIG. 13, the film is overlapped and wound around the outside a large number of times, so that the “winding” of the film winding start portion 50 is reduced. No impact has occurred. However, FIG.
When the film is pulled out as shown in FIG. 4 and, for example, in the case of a cartridge for taking 40 sheets, when the number of photographed images is reduced from about 20 to the latter half, the “abnormality” of the above-mentioned film winding start section 50 becomes out of the film winding state. It begins to occur on the radial side, and the amount of pull-out force of the film 1 is not constant, and light and heavy times are alternately repeated. Then, unevenness in the amount of pull-out force of the film 1 causes unevenness in feeding load and uneven feeding speed.

[0019]

SUMMARY OF THE INVENTION The above-mentioned Japanese Patent Laid-Open No. 7-27 is disclosed.
No. 0892 or a magnetic recording method of an apparatus disclosed in Japanese Patent Application Laid-Open No. 7-219021 does not describe a method for keeping a film feeding speed constant, and a fluctuation in the feeding speed was recognized. The above correction method is adopted.

For example, in the time chart of FIG. 8, when magnetic recording of data "1" and "0" is performed, one recording cycle T and the rise of the recording signal are performed based on the magnetic recording synchronization clock. Timings t1 and t2 are determined. If jitter occurs immediately after the first recording data "1" is recorded and the film feeding speed is warmly increased, t2> T where data "0" should be recorded. / 2. In this case, data that should be data "0" is inverted to data "1" is recorded, resulting in a write error. As described above, a problem that data is inverted due to jitter occurs.

Now, one recording cycle T is 1 bit cell, and for example, the recording density of the film is 21 bit cells / m.
m, film 1 frame winding time 500msec-700
msec, 1 when the length of one frame is 31.7 mm
Considering the bit cell frequency F, the frequency F of the one bit cell is as follows: F = 21 / ((0.5 to 0.7) /31.7) = 951 to 1331 Hz. Assuming that the 1-bit cell is divided into three to determine t1 and t2, the frequency is 3 × F = 2853 to 3994.2 Hz.

The frequency F of the 1-bit cell is 951 to 1
At 331 Hz, if the frequency of the jitter becomes the above-mentioned value, 3 × F = 2853 to 3994.2 Hz, the data may be inverted and a write error may occur. Even at lower frequencies, data may be inverted due to higher harmonics.

If the jitter is synchronized with a film driven roller signal that rotates following the movement of the film, the jitter can be absorbed by correcting the recording density. Write errors due to jitter cannot be corrected.

The causes of the above-mentioned jitter are as follows: (1) Jitter due to uneven rotation of the film feed motor of the camera at the time of magnetic recording and reproduction; (2) Film feed gear of the camera at the time of magnetic recording or reproduction. Jitter due to train (3) Jitter due to load fluctuation of the film feeding system of the camera at the time of magnetic recording or reproduction can be considered.

The jitter generated in the cartridge as the jitter due to the load fluctuation of the above item (3) is the jitter generated in the cartridge. Among them, the first jitter is extracted from the film in the cartridge shown in FIGS. 15 (A), (B) and (C). This will be described with reference to a schematic diagram of the state. As described above, when the winding start portion 50 is formed into an elliptical “abnormality”, the film drawing portion 51 is drawn out on the long side of the ellipse of the winding start portion 50 as shown in FIG. In this state, the cartridge shaft 30 rotates relatively slowly.

In a state where the film 1 is pulled out on the short side of the ellipse of the winding start portion 50 as shown in FIG. , The cartridge shaft 30 does not rotate.
However, when the film 1 is tightly wound as shown in FIG. 15C, a phenomenon occurs in which the cartridge shaft 30 rotates rapidly. This occurs even when the outer periphery of the film is not in contact with the case of the cartridge 2 when the film winding start portion 50 is in the “abnormal” state.

The above-mentioned change in the state is one cause of uneven feeding load and uneven feeding speed. This uneven feeding speed causes jitter in a magnetic recording type film. For example, in the case of a 40-sheet film, the feeding speed unevenness appears as a phenomenon in which jitter deteriorates after a 20-sheet film is formed, and the magnetic recording type is an important problem for the film.

As the second jitter due to the load fluctuation, there is a jitter particularly generated when the cartridge 2 of the type shown in FIG. That is, in the cartridge 2, the elastic flanges 41a, 41 for holding the film 1 from both sides when the film is fed out at the initial stage of loading.
b (see FIG. 9). When a certain amount of feeding is completed and the film is wound frame by frame by the winding spool on the camera side, a constant load is applied to the film 1 because the film is sandwiched by the elastic flanges 41a and 41b. However, as described above, the cartridge shaft 30 has the speed unevenness as described above, and particularly when the cartridge shaft 30 is temporarily stopped or rapidly rotated, the load of the film 1 by the elastic flanges 41a and 41b fluctuates. ,
This was a major cause of jitter generation. The above two types of jitter can be considered as jitter occurring in the cartridge 2.

The behavior of the film during feeding when the above-mentioned jitter occurs in a camera with a built-in conventional magnetic recording apparatus will be described with reference to FIGS. FIG. 16 is a state diagram showing film behavior during film feeding on a film path in the conventional camera. FIG. 17 shows a back tension B0 which is a tension generated on the upstream side SU in the feeding direction with respect to the magnetic head of the film during the film feeding, that is, on the side opposite to the feeding direction D.
It is a figure showing a change of. However, the looseness of the film is shown in an enlarged and emphasized manner.

As shown in FIG. 16, the film 1 sent out from the cartridge 2 passes on the film feed path behind the lens 101 and takes up the spool spool 1 of the camera.
02, it is wound up in the feeding direction D. A magnetic head 105 is provided on the spool shaft 102 side, and is adjacent to the magnetic head 105 and located on the downstream side S in the film feeding direction.
D, that is, a driven roller 103 that rotates in accordance with the film feeding urged by the spring member 104 is provided on the forward side in the feeding direction.

When the film 1 is being wound up by the spool shaft 102 and the film feeding load fluctuates as described above and tends to increase, as shown in FIG. 17, the back tension B0 is in the plus side region. is there. However, when the load suddenly decreases and the cartridge shaft rotates rapidly, the cartridge is fed out faster than the winding speed, the upstream side SU of the magnetic head 105 is slackened, and the back tension B0 is shifted to the minus side area. Then, the slack reaches the magnetic head 105. Then, it becomes a jitter on the magnetic recording, causing a recording or reproduction error.

The present invention has been made in order to solve the above-mentioned problems, and a fine feeding load variation during film feeding does not adversely affect a recording / reproducing operation of a magnetic head.
It is an object of the present invention to propose a film feeding mechanism for a camera capable of reducing jitter and reducing occurrence of magnetic recording errors.

[0033]

According to a first aspect of the present invention, there is provided a camera film feeding mechanism for performing magnetic recording and / or reproduction while feeding a film with a magnetic recording layer stored in a film cartridge. In a film feeding mechanism of a camera having a magnetic head in the film feeding path, a driven roller provided in the film feeding path, abutting on the film surface, and rotating according to the film feeding movement, Biasing means for biasing a driven roller in a direction in which the driven roller comes into contact with the film surface; the driven roller is disposed between the magnetic head and the film cartridge in the film feeding path. In the film feeding mechanism of the camera, when the film is fed, the film sent from the film cartridge is wound up through the driven roller and the magnetic head.

According to a second aspect of the present invention, there is provided a film feeding mechanism for a camera according to the first aspect of the present invention, wherein a pulse is generated in response to rotation of the driven roller driven by the film feeding movement. A pulse generating means for generating a signal is provided. In the film feeding mechanism of the camera, when the film is fed, the feeding movement amount of the film sent from the film cartridge is detected by the pulse generating means when passing through the driven roller, and the detection is performed. Magnetic recording based on the signal, and / or
Alternatively, reproduction is performed.

According to a third aspect of the present invention, there is provided a camera film feeding mechanism for performing magnetic recording and / or reproduction while feeding a film with a magnetic recording layer. A magnetic head provided in the path for performing magnetic recording and / or reproduction on the magnetic recording layer of the film while feeding the film in a predetermined film feeding direction, and a magnetic recording and / or reproduction And a driven roller that is arranged in contact with the film surface in a feeding path upstream of the magnetic head with respect to the predetermined film feeding direction and that rotates in accordance with the film feeding movement. In the film feeding mechanism of the camera, the film fed from the film cartridge when feeding the film by performing the magnetic recording and / or reproducing passes through the driven roller and then passes through the magnetic head. And rolled up.

[0036]

Embodiments of the present invention will be described below with reference to the drawings. Prior to a detailed description of a camera having a built-in film feeding mechanism according to an embodiment of the present invention, an outline of the film feeding mechanism will be described.
The film feeding mechanism of the camera uses a film with a magnetic recording layer, and magnetically records and / or reproduces photographing information and the like on a photographic film (hereinafter, referred to as a film). Focusing on jitter due to load fluctuation, particularly jitter due to feeding load fluctuation in a film cartridge (hereinafter, referred to as a cartridge), stabilize film feeding on a magnetic head,
This is a mechanism that suppresses fluctuations in film feeding speed to reduce jitter.

That is, the present film feeding mechanism performs magnetic recording for generating a synchronous clock for magnetic recording, or
By disposing a driven roller that rotates in conjunction with the film feed during playback, upstream of the magnetic head in the film feed direction, that is, on the cartridge side, uneven feeding load in the cartridge adversely affects the magnetic head. The film is pressed by a film driven roller so as not to cause the jitter, and the jitter is reduced.

The outline of the film feeding mechanism of the camera will be described with reference to FIG. 1, FIG. 2 or FIG. FIG. 1 is a state diagram showing the behavior of a film having a built-in film feeding mechanism during film feeding on a film path of a camera. As shown in the figure, a magnetic head 21 and a driven roller 13 urged by a spring are provided on a film feeding path between the cartridge 2 and the take-up spool shaft 11 on the camera side. A driven roller 13 is disposed on the upstream side SU in the film feeding direction D.
In FIG. 1, the looseness of the film is shown enlarged and emphasized.

FIGS. 2A, 2B, and 2C are diagrams showing a change in the frictional force due to the back tension which is the tension generated during the film feeding or the pressing of the driven roller 13. FIG. 2A shows the change in the back tension B1 on the upstream side SU 'in the feeding direction D from the driven roller 13, and FIG. 2B shows the change in the back tension B1 by the spring member 23 (see FIG. 5). Frictional force FR of the driven roller 13
FIG. 2C shows the resultant tension of the tension B1 and the friction force FR.
The change of the back tension B2 which occurs in the SU upstream from 1 is shown. The frictional force FR due to the spring urging force shown in FIG. 2B is set to be larger than the negative value of the back tension B1 of the cartridge 2 in FIG. 2A.

Film 1 is taken up by the camera side spool 1
The behavior of the film in the cartridge 2 when the film is wound up in step 1 is caused by the "abnormality" of the film wound around the cartridge shaft 30 as already described with reference to FIGS. 15 (A), (B) and (C). As a result, the cartridge shaft 30 does not rotate at a constant speed, causing film feeding unevenness.
The back tension B1 on the upstream side SU 'of the driven roller 13 pulsates as shown in FIG. Then, when the cartridge shaft 30 rotates rapidly as in the case of FIG.
1 becomes a minus side, and it becomes a state where it is fed faster than the winding speed. However, the slack is not the slack of the film that can be clearly seen with the naked eye, but the slack of the film at the jitter level of magnetic recording.

In the present film feeding mechanism, when the film 1 is loosened, a driven roller 13 is disposed on the upstream side SU of the film feeding of the magnetic head 21 as shown in FIG. The frictional force FR due to the spring bias of the driven roller 13 causes the back tension B of the cartridge 2 to increase.
1 is set larger than the minus side (Fig. 2
(See (A) and (B)).

Therefore, as shown in FIG. 2C, the back tension B2 of the film 1 at the upstream side SU in the feed direction of the magnetic head 21 does not become a negative value, and the absolute value itself of the width of the fluctuation of friction is Although not changed, the film 1 supplied from the cartridge 2 is pressed by the driven roller 13 so that the film 1 can be prevented from becoming loose near the magnetic head 21, eliminating friction unevenness and reducing jitter. it can.

Hereinafter, a camera incorporating a film feeding mechanism according to an embodiment of the present invention will be described in detail. FIG. 3 is a block diagram showing a film feeding system and a magnetic recording system of the camera according to the embodiment. FIG.
FIG. 4 is a plan view showing an arrangement of a film feeding system and a magnetic recording system of the camera of FIG. FIG. 5 is a side view showing a mounted state of the driven roller.

As shown in FIG. 3, the film feeding system and the magnetic recording system in the above-mentioned camera mainly control the entire camera, and incorporate control means for controlling magnetic recording and / or reproduction on the film. CPU 20, a motor control circuit 9 for controlling the driving of the film feeding motor, and the motor control circuit 9 provided in the take-up spool shaft 11.
, A feed / wind-up gear train 7 and a rewind gear train 8 driven by the feed motor 12, and a cartridge spool shaft 30 driven by the feed / wind-up gear train 7. The fork gear 10 and the spool gear 11a of the take-up spool shaft 11 are fixed to the slit plate 13a,
The driven roller 13 pressed in the film direction by a spring member 23 serving as an urging means, and a photo interrupter (hereinafter, referred to as a pulse generating means) detecting a rotation amount of the slit plate 13a.
PI, a photoreflector (hereinafter, referred to as PR) 17 as perforation detecting means, a magnetic head 21, a driven roller rotation detecting circuit 15 for taking in a driven roller signal as an output signal of the PI 14, It has a magnetic data write circuit 16 for outputting a write signal to the magnetic head 21 and a perforation detection circuit 18 for receiving an output signal of the PR 17.

The film 1 applied to the camera is housed in a cartridge 2 and two perforations 5 and 6 are provided for each photographing frame 3. A track 4 is provided. When the cartridge 2 is loaded in the camera, the R fork gear 10 is engaged with the cartridge spool shaft 30, and the rotation of the R fork gear 10 causes the film 1 to be sent out. After the photographing is completed, the film is rewound from the camera-side spool shaft 11 to the cartridge 2 side.

As shown in FIGS. 3 and 4, both the driven roller 13 and the magnetic head 21 are disposed on the forward side of the feeding direction D on the film feeding path adjacent to the photographing opening 19, that is, on the downstream side. A magnetic head 21 is also provided, and is similarly adjacent to the photographing opening 19 and on the opposite side to the feeding direction D, that is,
A driven roller 13 is provided on the upstream side. Accordingly, the driven roller 13 is disposed upstream of the magnetic head 21 in the feeding direction SU, and the cartridge 2 is positioned upstream of the driven roller 13 in the feeding direction SU '. Become.

Further, the driven roller 13 is rotatably supported while being pressed against the surface of the film 1 by a spring member 23, so that the driven roller 13 is accurately driven by the feeding of the film 1. The pressed state is the driven roller 13 shown in FIG.
Is shown in a side view showing a film contact state. The driven roller 13 is fixed to a rotatable roller shaft 13b, and is in pressure contact with the film 1 at a vertical position in the width direction. Further, a pulse generating slit plate 13a is fixed to the roller shaft 13b. PI1 across the slit plate 13a
4 are provided. The driven roller 13 is located at a position where the driven roller 13 is always pressed against the surface of the film 1. As a modified example, the driven roller 13 can be moved to a retracted position separated from the pressed position with respect to the film surface. It is also possible to propose one with a structure that does.

The driven roller 13 is provided with the spring member 2.
The amount of pressing force of the spring member 23, which rotates with the movement of the film while pressed against the film 3, pushes the film feeding load unevenness even slightly to the magnetic head 21 downstream of the film feeding load in the forward direction. It is set to a value that does not exist. That is, the value of the spring member pressing force amount is a force amount that generates the friction force FR described in FIG. 2B as the friction force of the driven roller 13 generated by the pressing of the spring member 23.

The film feed motor 12 can be engaged with the feeding / winding gear train 7 depending on the rotation direction, or can be engaged with the rewind gear train 8 by rotating in the reverse direction. Then, the R fork gear 10 or the spool gear 11a is driven through the gear train, and the film 1 is fed and unwound from the cartridge 2, and the film 1 is wound and spooled.
Roll up.

In the film feeding mechanism of the present camera having the above-described configuration, first, when the cartridge 2 is loaded, the film 1 is sent out, and passes through the film driven roller 13 which rotates following the movement of the film. After passing through the photographing opening 19 and passing through the PR 17 and the magnetic head 21, it is taken up by the take-up spool 11. Once the leading end of the film is wound on the take-up spool 11, the film 1 is wound up one frame at a time by the winding gear train 7, and photographing is performed.

Next, the one-frame winding operation of the camera,
Regarding the magnetic recording writing operation, the flowchart of the one-frame winding process in FIG. 6, the time chart for forming the magnetic recording synchronous clock at the time of film feeding in FIG. 7, the recording data "1" and "0" and the magnetic recording. This will be described with reference to a time chart of FIG. 8 showing the relationship with signals and the like. When exposure for one frame is completed and winding of one frame starts (step S1), pulse counting of a driven roller signal, which is an output signal of the PI 14 corresponding to the film feed amount, is started (slap S2). 32 pulses of driven roller signal
A synchronous clock for magnetic recording is generated by division, and magnetic data writing is performed based on the clock (step S
3).

Subsequently, the PR signal, which is the output signal of the PR 17, is checked and the arrival of the perforation 5 is waited (step S 4). If the perforation is detected, the pulse number of the driven roller signal obtained is determined by a predetermined number. Compare with the value (step S5). If it is not less than the predetermined value, that is, if the number of pulses corresponds to one frame, the film feeding motor 12 is decelerated and braked to stop the film feeding (step S8), and the next frame is stopped. Move on to the shooting operation.

If the pulse number of the driven roller signal is equal to or less than a predetermined value, it is determined that the film end has been reached,
The arrival at the film end is stored in the memory (step S6). Then, after the arrival of perforation (step S7), the film feed motor 12 is decelerated,
Then, the film feeding is stopped by applying the braking, that is, applying the short brake and the reverse rotation brake (Step S).
8) End the shooting.

The method of generating the clock signal for magnetic recording by dividing the pulse of the driven roller signal described above is described in the camera disclosed in Japanese Patent Application Laid-Open No. HEI 8-29857. Since the number of pulses is generated according to the film movement amount, even if a relatively large frequency unevenness occurs at the film feeding speed, the pulses of the driven roller signal follow, so that the pulses are magnetically spaced at equal intervals to the film. It is possible to record.

According to the time chart shown in FIG. 7, when the winding of one frame starts, the PR 17 outputs a perforation detection PR signal, and the PI 14 outputs a driven roller signal corresponding to the film feed amount. If the pulse period of the immediately preceding driven roller signal after the output of the driven roller signal by a predetermined number of pulses is TA and the pulse period of the driven roller signal at the current time is TB, the magnetic field at this time is assumed. The period TS1 of the recording synchronous clock is obtained by averaging and dividing by the number of divisions M. TS1 = ((TA + TB) / 2) / M (3)

The pulse period TB at the current time is
Assuming that the pulse period of the driven roller signal following the driven roller signal is TC, the period TS2 of the magnetic recording synchronous clock at this time is similarly TS2 = ((TB + TC) / 2) / M (4) Becomes

If the pulse period of the driven roller signal, which is an arbitrary time and follows the driven roller signal of the preceding pulse period Tn-1, is Tn, the period of the magnetic recording synchronous clock at this time is Tn. Similarly, TSn is given by TSn = ((Tn-1 + Tn) / 2) / M (5) The division number M for dividing the average value of the period before and after the driven roller signal is, for example, 32 in the example of the above-mentioned Japanese Patent Application Laid-Open No. 8-29857.

Each data is magnetically recorded in synchronization with a predetermined number of pulses of the magnetic recording synchronous clock, for example, three pulses. That is, the rising timing t1 or t2 is synchronized with the magnetic recording synchronization clock, and the recording data "1" is obtained as shown in FIG.
The N and S states are magnetically recorded on the film corresponding to "0".

In the film feeding mechanism of the present camera,
As shown in FIG. 1, the film feeding direction D of the magnetic head 21
The driven roller 13 is disposed on the upstream side SU, and the cartridge 2 is disposed on the upstream side SU 'of the driven roller 13. Further, as described with reference to FIG.
The frictional force FR due to the urging of the spring 3 is set to be larger than the negative value of the back tension B1 generated in the cartridge 2. Therefore, the magnetic head 2
Film 1 at the upstream side SU in the feeding direction of the portion adjacent to the film 1
Of the magnetic head 21 and the driven roller 13 during the film feeding.
There is no slack in the film 1 between them.

As described above, according to the film feeding mechanism of the present camera, the film supplied from the cartridge 2 is held down by the driven roller 13 so that the driven roller 13 which is the upstream side SU in the feeding direction of the magnetic head 21 and the driven roller 13 are magnetically driven. The transmission of the slack of the film 1 generated in the cartridge 2 between the heads 21 is regulated, and the fluctuation of the feeding speed on the magnetic head 21 is suppressed. Further, since the film 1 does not slack on the upstream side SU in the feeding direction, the driven roller 13
The amount of film feeding and moving through the magnetic head 21 surely matches the amount of film feeding and moving through the magnetic head 21, and the driven roller signal from the PI 14 corresponds to the amount of film feeding and moving on the magnetic head 21 with high accuracy. You will be in a state to Since magnetic recording is performed by the synchronous clock for magnetic recording based on the driven roller signal output in this manner, even if a load change occurs in the cartridge 2, magnetic recording without erroneous recording is performed.

(Supplementary Note) Based on the above-described embodiment of the present invention, it is possible to propose a film feeding mechanism for a camera having the following configuration. That is, (1) magnetic recording while feeding a film with a magnetic recording layer stored in a film cartridge, and / or
In a film feeding mechanism of a camera having a magnetic head for performing reproduction, a driven roller that rotates according to a film feeding movement and detects a film movement amount is provided, and the driven roller is rotatably brought into contact with the film surface. And a biasing means for biasing the driven roller, wherein the driven roller is disposed in a feeding path between the magnetic head and the film cartridge. According to the film feeding mechanism of the camera, even if a load fluctuation of the film feeding occurs in the film cartridge, the film passing through the magnetic head is prevented from being slackened by pressing with the driven roller, recording, and /
Alternatively, reproduction mistakes can be eliminated.

(2) In a film feed mechanism of a camera having a magnetic head for performing magnetic recording and / or reproduction while feeding a film with a magnetic recording layer stored in a film cartridge in a film feed path. A driven roller that detects the amount of film movement by rotating in accordance with the film feeding movement, and biasing means that biases the driven roller to abut on the film surface in a rotatable manner,
A film feeding mechanism for a camera, wherein the driven roller is disposed in a feeding path upstream of the magnetic head with respect to a film feeding direction during magnetic recording and / or reproduction. . According to the film feeding mechanism of the camera, even when the feeding load in the film cartridge fluctuates, the film is held down by the driven roller to prevent the film from being loosened between the driven roller and the magnetic head. High-precision magnetic recording and / or reproduction can be performed by reducing the fluctuation of the film feeding speed passing through the magnetic head and reducing the fluctuation.

(3) In additions (1) and (2), further, a pulse generating means for generating a pulse signal according to the rotation of the driven roller, and a pulse signal to the film in response to the pulse signal from the pulse generating means. Control means for controlling the magnetic recording and / or reproduction of the camera. In the film feeding mechanism of the camera, in addition to the effect of the film feeding mechanism of the camera described in the appendix (1) or (2), the rotation of the driven roller is more accurately detected by the pulse generation means,
There is also an effect that highly accurate magnetic recording and / or reproduction can be performed based on the detection signal.

(4) In additions (1) and (2), further, a pulse generating means for generating a pulse signal in accordance with the rotation of the driven roller, and a perforation detecting means for detecting the perforation of the film. A film feed mechanism for a camera, wherein the film feed mechanism is provided, and the film feed drive is controlled by the pulse signal generated by the pulse generating means and the perforation detecting means. In the film feeding mechanism of the camera, in addition to the effect of the film feeding mechanism of the camera described in (1) or (2), the rotation of the driven roller is more accurately detected by the pulse generation means, and Since the perforation position is accurately detected by the perforation detection means, high-precision magnetic recording and / or high-precision magnetic recording is performed at a position corresponding to the photographing frame based on the detection signals.
Alternatively, there is an effect that reproduction can be performed.

(5) In a film feeding mechanism of a camera for performing magnetic recording and / or reproduction while feeding a film with a magnetic recording layer, the film is provided in a film feeding path, and is provided in a predetermined film feeding direction. While feeding
A magnetic head for performing magnetic recording and / or reproduction on the magnetic recording layer of the film, and a feeding path upstream of the magnetic head with respect to the predetermined film feeding direction during magnetic recording and / or reproduction A driven roller that is movably disposed therein and rotates in accordance with the film feeding movement while being in contact with the film surface; and a biasing unit that biases the driven roller to be in contact with the film surface. A film feeding mechanism for a camera. According to the film feeding mechanism of the camera, according to the film feeding mechanism of the camera, even if the feeding load in the film cartridge fluctuates, the driven roller presses the film with the driven roller, and the driven roller High-precision magnetic recording and / or reproduction can be performed by reducing the occurrence of slack in the film between the magnetic heads and reducing fluctuations in the film feeding speed passing through the magnetic head. Further, since the driven roller can move forward and backward, the driven roller can be brought into contact with the film surface only in a shooting state, during magnetic recording, or only during reproduction, and the magnetic force can be applied when feeding or rewinding the film. By setting the driven roller in the contact state only at the time of recording or at the time of reproduction, it is possible to facilitate the operation of feeding and rewinding the film.

(6) A film feeding mechanism for a camera according to (5), wherein the urging means applies a frictional force of a predetermined force or more in the film feeding direction. The film feeding mechanism of the camera can apply an appropriate frictional force to the driven roller by the urging means in addition to the effect of the appendix (5), thereby reliably reducing the occurrence of the film slack. It also has the effect that it can be done.

(7) In addition (6), the frictional force equal to or greater than a predetermined force by the urging means is larger than the force for feeding the film in the feeding direction due to the back tension generated on the film cartridge side during the film feeding. A film feeding mechanism for a camera, which is set large. According to the film feeding mechanism of the camera, in addition to the effect of the above (6), the urging means with respect to the driven roller applies a frictional force larger than an amount of force for feeding the film in a feeding direction. This also has the effect that the occurrence of slack can be reliably reduced.

(8) In the supplementary note (6), the driven roller urged by the urging means may cause the film slack generated on the film cartridge side during the film feeding to cause the film feeding movement speed on the magnetic head side. A film feed mechanism for a camera, wherein the film feed mechanism does not affect the image. The film feeding mechanism of the camera has a high precision in addition to the effect of appendix (6), so that the slack generated on the cartridge side by the driven roller does not affect the film feeding state on the magnetic head side. There is also an effect that magnetic recording and / or reproduction can be performed.

[0069]

As described above, according to the film feeding mechanism of the camera according to the first aspect of the present invention, the film is held down by the driven roller even if the feeding load in the film cartridge fluctuates. To perform high-precision magnetic recording and / or reproduction by reducing the occurrence of slack in the film between the driven roller and the magnetic head and reducing fluctuations in the film feeding speed passing through the magnetic head. Can be.

According to the film feeding mechanism of the camera according to the second aspect of the present invention, in addition to the effect of the film feeding mechanism of the camera according to the first aspect, the rotation of the driven roller is performed by the pulse generating means. Is more accurately detected, and based on the detection signal, high-precision magnetic recording, and / or
There is also an effect that reproduction can be performed.

According to the film feeding mechanism of the camera according to the third aspect of the present invention, the film is pressed by the driven roller even if the feeding load in the film cartridge fluctuates, so that the driven roller The occurrence of slack in the film between the magnetic head and the magnetic head is reduced, and the fluctuation of the film feeding speed passing through the magnetic head is reduced, whereby highly accurate magnetic recording and / or reproduction can be performed.

[Brief description of the drawings]

FIG. 1 is a state diagram showing a film behavior during film feeding on a film path of a camera including a film feeding mechanism according to an embodiment of the present invention.

FIG. 2 is a diagram showing a back tension generated in a film in a film feeding mechanism of the camera of FIG. 1 and a change in friction force caused by pressing of a driven roller;
FIG. 2A shows the change in the back tension on the upstream side in the feeding direction from the driven roller, and FIG. 2B shows the frictional force FR of the driven roller pressed by the spring member.
Is a composite tension of the tension and the frictional force, and indicates a change in the back tension generated upstream of the magnetic head.

FIG. 3 is a block diagram showing a film feeding system and a magnetic recording system in the camera shown in FIG. 1;

FIG. 4 is a plan view showing an arrangement of a film feeding system and a magnetic recording system in the camera of FIG.

FIG. 5 is a side view showing a mounted state of a driven roller in the camera of FIG. 1;

FIG. 6 is a flowchart of a one-frame winding process in the camera of FIG. 1;

FIG. 7 is a time chart for forming a synchronous clock for magnetic recording during film feeding in the camera of FIG. 1;

FIG. 8 shows recording data “1” and “0” in the conventional or digital recording method in the camera according to the embodiment of the present invention.
Chart showing the relationship between the data and the magnetic recording signal.

FIG. 9 is an exploded perspective view of a film cartridge applied to the camera according to the related art or the embodiment of the present invention.

FIG. 10 is a sectional view of the film cartridge of FIG. 9;

FIG. 11 is a sectional view taken along line AA ′ of FIG. 10;

FIG. 12 is a development view of a film housed in the film cartridge of FIG. 9;

FIG. 13 is a sectional view showing a state where the film is wound many times in the film cartridge of FIG. 9;

14 is a cross-sectional view of the film cartridge of FIG. 9 in a state where the number of times of winding the film is reduced.

15A and 15B are schematic diagrams illustrating a state in which the film is pulled out from the film cartridge in FIG. 9; FIG. 15A is a schematic diagram illustrating a state where the film drawer is on the long side of the “abnormal” ellipse; FIG. 15B is a schematic diagram showing a state where the film drawer is on the short side of the “abnormal” ellipse, and FIG.
(C) is a schematic diagram of a state where the film is tightly wound.

FIG. 16 is a view showing a behavior of a film on a film feeding path in a conventional film feeding mechanism of a camera.

FIG. 17 is a diagram showing a change in back tension during film feeding in the film feeding mechanism of the camera in FIG. 16;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Film (film with a magnetic recording layer) 2 ... Film cartridge 13 ... Driving roller 14 ... PI (pulse generation means) 21 ... Magnetic head 23 ... Spring member (biasing means) D ... Film supply Feeding direction SU …… Upstream of the film feeding direction

Claims (3)

[Claims] 1. A magnetic recording device for feeding a film with a magnetic recording layer stored in a film cartridge, and / or
Alternatively, in a film feed mechanism of a camera having a magnetic head for performing reproduction in a film feed path, a driven mechanism that is provided in the film feed path and abuts on the film surface and rotates according to the film feed movement. And a biasing means for biasing the driven roller in a direction in which the driven roller comes into contact with the film surface.The driven roller is disposed between the magnetic head and the film cartridge in the film feeding path. A film feeding mechanism for a camera, wherein the film feeding mechanism is arranged. 2. A film feeding mechanism according to claim 1, further comprising a pulse generating means for generating a pulse signal in accordance with the rotation of said driven roller driven by said film feeding movement. 3. A film feeding mechanism for a camera which performs magnetic recording and / or reproduction while feeding a film with a magnetic recording layer, provided in a film feeding path, and feeds the film in a predetermined film feeding direction. A magnetic head for performing magnetic recording and / or reproduction on the magnetic recording layer of the film while feeding, and upstream of the magnetic head with respect to the predetermined film feeding direction during magnetic recording and / or reproduction. And a driven roller that is disposed in contact with the film surface in the side feeding path and that rotates in accordance with the film feeding movement.