JPH04172431A - Camera of prewind type using film with magnetic storage portion - Google Patents

Abstract

PURPOSE:To prevent the end of a film from being hanged by separating a magnetic head and the magnetic storage portion of the film from each other as the film is wound, the head and the storage portion being pressed into contact with each other by a pressure contact member, and adjusting the position of the pressure contact member as the film is rewound. CONSTITUTION:When a film feed motor is rotated in the direction in which to wind a film a release gear 7 is rotated in the direction indicated by the arrow C and the rack portion 8d of a release lever 8 ends and does not move in the D direction. Since a pushing lever 13 has its arm 13c engaged with the pin 8c of the release lever 8, the pad 17 is also allowed to escape outside of the travel track of a film 4 and does not obstruct the travel of the film 4. When the feed motor is rotated in the direction in which to wind the film the film 4 is further fed and wound on a receiving spool 3 and when the film 4 is stretched at the end of winding the feed motor is reversed and the release gear 7 is rotated in the direction opposite to the arrow C and the pad 17 pushes the film 4 and presses a magnetic head 6 into contact with the film 4 so that movement of the film 4 is stopped.

Description

Detailed Description of the Invention (Field of Application of the Invention) The present invention provides a magnetic head for writing information to or reading information from a magnetic storage section provided on a film, and a magnetic head and a magnetic storage section of the film that are brought into pressure contact with each other. The present invention relates to an improvement of a prewind type camera using a film with a magnetic storage unit, which is equipped with a pressure contact member and a film feeding motor.

Note that the above-mentioned prewind method refers to a method in which the entire film is once wound onto the film take-up spool of the camera, and then the film is rewound into the film cartridge and photographed frame by frame.

(Background of the Invention) Conventionally, in a camera film feeding device, a film leading end portion (so-called leader portion) protruding from a film cartridge is engaged with a sprocket or take-up spool of the camera, and the sprocket or take-up spool is Film was loaded by driving. However, with this type of film, the leading edge of the film must be set by a person, which is not only troublesome, but also causes the film to not be loaded properly if the leading edge of the film is set in the wrong position. This has the drawback that the film is exposed to light and becomes unusable if it is pulled.

In view of this point, in recent years, the following film cartridge has been proposed in US Pat. No. 4,834,306 as a new type of film cartridge.

Figures 10 to 12 show film cartridges of this type, with Figure 10 being a longitudinal sectional view, and Figure 11 being a longitudinal sectional view.
The figure is a cross-sectional view, and FIG. 12 is a side view of the main parts.

This has a film passage slit 37, a film 34 whose one end is fixed to a recess 38a of a film spool 38, and a film 34 wound around the film spool 38. The expansion of the outer circumference in the radial direction is restricted by the restriction portion 39a, and the film 3
A holding member 39 prevents the outermost periphery of the film from substantially contacting the inner wall 35a of the film cartridge 35, and a part of the holding member 39 is deformed, and the outermost periphery of the film is prevented from being restricted in the radial direction by the holding member 39. A release member 40 that continuously releases the restriction, and a guide member 41 that is integrally formed with the release member 40 and guides the portion of the film 34 released from the restriction to the film passing slit 37. Due to the expansion of the outermost periphery due to loosening of the film 34 caused by rotation in the film extrusion direction, there is no slippage between the outer periphery of the film 34 and the presser member 39, a force is applied to the film 34 in the extrusion direction, and the film 34 is released from the film cartridge 35. This allows the film 34 to be ejected.

If this type of film cartridge 35 (this type is called a thrust type film cartridge) is used, after loading it into the camera, the film spool 38 of the film cartridge 35 is rotated by a fork to eject the film 34. It is possible to adopt a configuration in which the film 34 is fed until it is wrapped around the film spool of the camera, and then the film 34 is fed by the film spool of the camera, so that the user can
It is no longer necessary to touch the tip of the device, eliminating the drawbacks of the conventional method.

In addition, in recent years, it has become possible to use film having a magnetic storage section, write photographic information such as shutter speed, aperture value, year, month, title, etc. into this magnetic storage section using a magnetic head, and read out this photographic information as necessary. This camera was awarded U.S. Patent No. 48.
It has been proposed in No. 64332, etc.

Furthermore, a camera in which the magnetic head writes information to the magnetic storage section of the film only when winding the film to the next frame after the film has been exposed is disclosed in W o 90104203 (PCT
/US89104343).

By the way, when writing or reading information to or from a film with a magnetic storage section as described above using a magnetic head, in order to do this accurately, the magnetic storage section of the film and the magnetic head must be pressed together with a certain pressure to ensure that the magnetic head is It is necessary to have a structure in which the head and the magnetic storage section are in contact with each other. For this purpose, it is necessary to arrange film pressing means such as a pressing pad at a position facing the magnetic head with the film sandwiched therebetween. When this film with a magnetic storage section is used in the above-mentioned thrust type film cartridge, the following problems arise.

1) If the film pressing means is in advance pressed against the magnetic head by an elastic member such as a spring, when the film extrusion operation is performed, the leading edge of the film gets caught by the film pressing means or the magnetic head, and further film extrusion operation is prevented. It becomes impossible.

2) Make the film pressure contact means or magnetic head movable in the thickness direction of the film by a dedicated motor, etc., and move the film pressure contact means or magnetic head until the leading edge of the film passes through the magnetic head and film pressure contact means by the film extrusion operation. If the head is moved in the direction of the thickness of the film, a new drive source such as a dedicated motor is required, which increases the cost. Furthermore, the timing for press-contacting the film to the magnetic head becomes complicated, and the electrical circuit becomes complicated.

(Objective of the Invention) The object of the present invention is to solve the above-mentioned problems, and to prevent the leading edge of the film from getting caught in the magnetic head or the pressure contact member, making further film feeding impossible. Moreover, it is an object of the present invention to provide a prewind type camera using a film with a magnetic storage section, which eliminates the need for an expensive drive source for changing the position of a magnetic head or a pressure contact member.

(Features of the Invention) In order to achieve the above object, the present invention is arranged between a film feeding motor and a pressure contact member, and the film feeding motor is arranged in a direction in which the film is wound onto a film take-up spool of a camera. In conjunction with the rotation, the pressure contact between the magnetic head and the magnetic storage portion of the film by the pressure contact member is released.
A variable position member is provided, which moves as the film feeding motor rotates in a direction to rewind the film into the film cartridge, and causes the pressure member to press the magnetic head and the magnetic storage portion of the film. The output of the film feeding motor is used to adjust the position of the pressure contact member, and
The present invention is characterized in that the pressure contact member is positioned so that the pressure contact between the magnetic head and the magnetic storage portion of the film is released when the film is taken out from the film cartridge.

(Embodiment of the invention) FIGS. 1 to 7 show a first embodiment of the invention.

In FIG. 1, 1 is a camera body, 2 is a thrust type film cartridge, and a film tube (not shown) inside the film cartridge is engaged with a fork (not shown) fixed to the camera body 1. As shown in FIG. 3 is a film take-up spool, and this film take-up spool 3 and the fork (not shown) are driven by a drive mechanism to be described later.

4 is a film equipped with a magnetic storage section, and the film cartridge 2 is inserted into the film cartridge 2 by rotating a fork (not shown) in the direction of the arrow.
It is discharged and driven from inside in the direction of arrow B. Reference numeral 5 denotes a film pressure plate, which is attached to the camera body 1 while maintaining a predetermined distance from the film rail surface 1a of the camera body 1. A magnetic head 6 is fixed to the film pressure plate 5 and is pressed against the magnetic storage portion of the film 4 to read or write information.

7 is a release gear, and when the film feeding motor (not shown) rotates to wind up the film, that is, rotate a fork (not shown) in the direction A, the release gear 7 is decelerated by the motor so that it rotates in the direction C. They are connected via a gear train. Reference numeral 8 denotes a release lever whose elongated holes 8a and 8b are slidably fitted into bins 9 and 10 provided in the camera body 1, and which has a rack portion 8d and can be engaged with the release gear 7. . 11.12 is a spring, one end of which is attached to the camera body 1, the other end of which is attached to the release lever 8;
1 biases the release lever 8 in the direction opposite to the direction of the arrow, and a spring 12 biases the release lever 8 in the direction of the arrow.

Here, FIGS. 2 and 3 show the release gear 7, release lever 8. Spring 11. This is an enlarged view of the spring 12. In the state shown in FIGS. 1 and 2, the combined force of the springs 11 and 12 urges the release lever 8 in the direction of arrow E, and in the state shown in FIGS. The combined force of 11 and 12 urges the release lever 8 in the direction of the arrow.

Numeral 13 is a pressing lever, and its elongated holes 13a and 13b are slidably fitted into bins 14 and 15 provided in the camera body l. Reference numeral 16 denotes a spring, one end of which is attached to the camera body 1 and the other end of which is attached to the lever 13, and which urges the lever 13 in the direction of arrow E. A pressing pad 17 is attached to the lever 13 and is used to press the film 4 and bring the film 4 and the magnetic head 6 into pressure contact.

The camera of this embodiment winds the entire film 4 on the film winding spool 3 in advance, then feeds the film 4 into the film cartridge 2 in the direction of rewinding, indexes one frame, and takes a picture. This is a so-called prewind camera, and is driven by a known sequence.

In the state shown in FIG. 1, the film feeding motor (not shown) is rotating in the film winding direction, and the release gear 7 is rotating in the direction of arrow C. However, even if the release gear 7 rotates in the direction of arrow C, the rack portion 8d of the release lever 8 is immediately interrupted, so the release lever 8 does not move any further in the direction D. Since the arm 13c is configured to engage with the arm 8c,
In this pressing, the lever 13 is held at the position shown in FIG. 1, and the pad 17 also escapes out of the traveling trajectory of the film 4 as shown in FIG. 1, preventing the film 4 from traveling even if the leading edge of the film passes. There isn't.

Thereafter, the film 4 is further fed by rotation of a film feeding motor (not shown) in the film winding direction, and is wound around the film take-up spool 3 by known means such as rubber rollers or claws. When the film 4 is fully wound around the film take-up spool 3 and the film 4 is stretched, a film rewind mode is entered by known means, and the film feeding motor is reversed.

As a result, the release gear 7 rotates in the direction opposite to the arrow C.
Since the release lever 8 is urged in the E direction by the combined urging force of the spring 11.1.2 and the urging force of the spring 16 which urges the lever 17, the rack portion 8d and the release gear 7 are engaged. , the release lever 8 moves in the E direction. Therefore, due to the biasing force of the spring 16, the pressing lever 13 also moves in the E direction, the pad 17 pushes the film 4, the magnetic head 6 and the film 4 come into pressure contact, and the movement stops (see FIG. 4). Further, when the pin 8c of the release lever 8 is pressed, the rack portion 8d is interrupted after the contact with the arm 13c of the lever 13 is released, so the release lever 8
does not move beyond the position shown in FIGS. 3 and 4.

Since the film feeding motor (not shown) is connected to the release gear 7 via a reduction gear train, the springs 11 and 12 are connected even when the motor is stopped in the state shown in FIGS. 3 and 4.
The release lever 8 does not move in the D direction depending on the combined urging force. Therefore, one frame photography continues in the direction of rewinding the film 4 into the film cartridge 2, but during this time the pad 17 is always pushing the film 4 to keep the magnetic head 6 and the magnetic storage part of the film 4 in pressure contact. This ensures that a large amount of information can be written (or read) into the magnetic head 6 when rewinding one frame after photographing is completed.

Next, the film feeding mechanism of this camera will be explained.

5 to 7 are plan views of the gear train, and 18 is a pinion gear directly connected to a film feeding motor (not shown);
9 is a first gear that meshes with the pinion gear 18. 20
is a second gear, which meshes with the first gear 19 at a large gear portion 20a. Reference numeral 7 designates the above-mentioned release gear, the large gear part 7a meshing with the small gear part 20b of the second gear 20, and the small gear part 7b meshing with the rack part 8d of the release lever 8 mentioned above.

These gear trains sufficiently reduce the rotational speed of a film feeding motor (not shown) and transmit it to the release gear 7.

21 is a spool first gear, and a large gear portion 21a meshes with the first gear 19. 22 is a spool second gear that meshes with the small gear portion 21b of the spool first gear 21. 23
is a spool planetary gear, which meshes with the spool second gear 22. Reference numeral 24 connects the spool second gear 22 and the spool planetary gear 23, and is rotatable about a portion 24a as the rotation center, and holds the spool planetary gear 23 rotatably while generating frictional force, similar to the known planetary gear mechanism. However, depending on the rotation direction of the spool second gear 22, the spool planetary gear 2
3 is a spool planetary connection lever that revolves around the spool second gear 22 as its center of rotation.

Reference numeral 25 denotes a stopper provided on the camera body, which restricts clockwise rotation of the spool planetary connecting lever 24. 2
Reference numeral 6 designates a spool third gear that can mesh with the spool planetary gear and is directly connected to the film take-up spool 3 shown in FIG. A fork sun gear 27 meshes with the first gear 19.

28 and 29 are a fork first planetary gear and a fork second planetary gear that mesh with the fork sun gear 27. 30 is rotatable at the center of the fork sun gear 27, and as in the known planetary gear mechanism, the fork first planetary gear 28. Fork second planetary gear 29
This is a fork planetary coupling lever that holds a fork first planetary gear 28 and a fork second planetary gear 29 so as to revolve around the fork sun gear 27, with the fork sun gear 27 as the center of rotation.

31 is a fork first gear, and a large gear portion 31a can mesh with one of the fork first planetary gear 28 and the fork second planetary gear 29, respectively. 32 is a fork second gear directly connected to a fork (not shown), and the fork first gear 31
It meshes with the pinion gear part 31b.

FIG. 5 shows a state in which the film feeding motor (not shown) is rotating in the direction in which the film 4 is ejected from the film cartridge 2 and taken up on the film take-up spool 3, similar to the state shown in FIG. , and each gear is rotating as shown by the arrow.

Here, if the winding speed of the film 4 by the film take-up spool 3 is vl, and the speed at which the film 4 is ejected from the film cartridge 2 by the fork is v2, it is set that Vl>V2, and the film 4 is When it is wound onto the take-up spool 3, the force is transmitted through the film 4 to the fork second gear 32. Although an attempt is made to rotate the fork first gear 31 faster than the rotational speed transmitted from a film feeding motor (not shown), the fork first gear 31 jumps the fork first planetary gear 28, and as shown in FIG. It momentarily disengages and absorbs the speed difference.

FIG. 7 shows a state in which the film feeding motor (not shown) is rotating in the direction in which the film 4 is stored in the film cartridge 2, as in the state shown in FIG. 4, and each gear is It rotates as shown by the arrow.

8 and 9 are cross-sectional views of a camera showing a second embodiment of the present invention. In the first embodiment, the film feed motor was rotated to move the pad. In the second embodiment, the pad is fixed and the magnetic head is moved by the rotation of a film feeding motor.

In FIG. 8, 101 is a camera body, and 102 is a pad fixed to the camera body 101, which serves to support the film 121 that is pressed against the magnetic head 105. 10
3 is an interlocking lever rotatably attached to the camera body 101, 104 is a film pressure plate, 105 is the aforementioned magnetic head, 1°6 is a mounting plate to which the magnetic head 105 is fixed,
107 is a holding stand fixed to the film pressure plate 104, and the sleeve 10 of the mounting plate 106 is attached to the shafts 107a and 107b.
6a and 106b are slidably fitted together. A holding rod 108 is fixed to the mounting plate 106, and its tip 108a can come into contact with the arm 13b of the interlocking lever 103. 1
09, the magnetic head 105 and mounting plate 106 are placed in the direction of arrow G;
In other words, it is a compression spring that presses against the film 121 side.

110 is a release gear similar to the first embodiment, 111 is a release lever whose long holes 110a and 110b are slidably fitted into bins 112 and 113 provided in the camera body 101, and has a rack portion 110d. The release gear 11
It is possible to mesh with 0. Reference numerals 114 and 115 designate springs with one end attached to the camera body 101 and the other end attached to the release lever 111. 116 is a long hole 116a in a bin 117, 118 provided in the camera body 101.

116b is slidably fitted with a lever, the arm portion 116c of which engages with the pin 111c of the release lever 111, and the pin 116d of which engages with the groove 103 of the interlocking lever 103.
It is slidably fitted into a. 119 is a spring,
One end is attached to the camera body 1, and the other end is attached to the lever 116, and the pusher urges the lever 116 toward the film 121 side. 120 is a thrust type film cartridge, and 122 is a film take-up spool.

Incidentally, since the film feeding mechanism is the same as that in the first embodiment, the drawing and explanation thereof will be omitted here.

In the state shown in FIG. 8, the release gear 110 is in a state where the film feeding motor (not shown) is rotating in the film winding direction.
is rotating in the direction of arrow C, and the release lever 111 is rotated in the direction of arrow C.
Stop moving in the D direction at the position shown in the figure. Also, press lever 1
16 is the pin 1 of the release lever 111;
6C is configured to engage, it is held in the position shown in FIG. 8, and the interlocking lever 103 in which the bin 116d and the groove 103a are fitted is locked in the state shown in FIG. Therefore, the tip 108 of the interlocking lever 103 is
Since the position of the holding rod 108, that is, the mounting plate]
06, the magnetic head 105 is maintained in a retracted state outside the film running trajectory against the biasing force of the compression spring 109.

After that, the film feeding motor (not shown) moves to the film winding E.
By rotating in the winding direction, the film 4 is further fed and wound around the film take-up spool 122 by known means such as rubber rollers or claws. When the film 121 is completely wound around the film take-up spool 122 and the film 121 is stretched, the film rewind mode is established by known means, and the film feeding motor is reversely rotated. As a result, the release gear 110 moves to the arrow C
The release lever 111 and the pressing lever 116 move in the direction of arrow E to the position shown in FIG. 9, as in the first embodiment.

Therefore, the interlocking lever 103 rotates counterclockwise from the state shown in FIG. 8 as shown in FIG. 9, and the holding rod 108. The mounting plate 106 moves in the direction of arrow G according to the bias of the compression spring 10'7. As a result, the magnetic head 105 is in a state where the surface of the film 121 is pressed against the pad 102 side as shown in FIG.
A pressure contact state of 05 is formed.

According to each of the above embodiments, in a prewind type camera, the pad or magnetic head is moved around the film in conjunction with the rotation of the film feeding motor in the direction of winding the film onto the film winding spool of the camera. Since the film is retracted out of the traveling trajectory, there is no problem that the leading end of the film gets caught in a bat or magnetic head, making further film feeding (film extrusion) impossible. In addition, when photographing one frame at a time while rewinding the film into the cartridge, the pad or magnetic head is moved into the travel path of the film in conjunction with the rotation of the film feeding motor in the rewinding direction. Therefore, pressure contact between the magnetic head and the film can be realized at low cost without requiring a special driving source.

In addition, since the magnetic head is in pressure contact with the film when rewinding the film, if the pad or magnetic head is retracted out of the film travel path or inserted into the film travel path each time the film is fed, In comparison, a large amount of information can be written to or read from the magnetic storage section of the film without waste, and the camera sequence can also be simplified.

(Effects of the Invention) As explained above, according to the present invention, the film feeding motor is disposed between the film feeding motor and the pressure contact member, and the film feeding motor winds the film onto the film winding spool of the camera. In conjunction with the rotation, the pressure contact between the magnetic head and the magnetic storage portion of the film by the pressure contact member is released.
When the film feeding motor rotates in the direction of loading/rewinding the film into the film cartridge, a variable position member is provided for causing a pressure contact member to press the magnetic head and the magnetic storage portion of the film. Therefore, the output of the film feeding motor is used to adjust the position of the pressure contact member, and when the film is removed from the film cartridge, the pressure contact between the magnetic head and the magnetic storage portion of the film is released. The present invention is characterized in that the pressure contact member is positioned so as to It is possible to prevent the leading edge of the film from getting caught in the magnetic head or pressure contact member, making further film feeding impossible, and there is no need for an expensive drive source to change the position of the magnetic head or pressure contact member. It can be done.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing the main structure of the camera during film winding in the first embodiment of the present invention, and FIG. 2 is a plan view showing an enlarged view of the release gear and release lever in the state shown in FIG. 1. Figure 3 is an enlarged plan view showing the release gear and release lever in the state shown in Figure 4, Figure 4 is a cross-sectional view showing the main structure of the camera during film rewinding, and Figure 5. 7 to 7 are plan views showing the film feeding mechanism, FIG. 8 is a cross-sectional view showing the configuration of main parts of the camera during film winding in the second embodiment of the present invention, and FIG. 9 is a plan view showing the film feeding mechanism.
10 is a longitudinal sectional view of the thrust-type film cartridge used in this embodiment, and FIG. 11 is a lateral sectional view thereof. FIG. 12 is a side view of the main parts. 2... Thrust type film cartridge, 4.
... Film with magnetic memory unit, 6 ... Magnetic head, 7 ... Release gear, 8 ... Release lever, 11.12 ... Spring, 13...
...Pushing is done by lever, 17... Bat, 18
...Pinion gear, 19...First gear, 20...Second gear, 102...Pad, 103...Interlocking lever, 105・・・・・・
・Magnetic head, 106...Mounting plate, 108...
...Holding rod, 109...Compression spring,
110... Release gear, 111... Release lever, 114, 115... Spring, 11
6...Pushing is done using a lever.

Claims (1)

[Claims] (1) A magnetic head that writes or reads information to a magnetic storage section provided on a film, a pressure contact member that presses the magnetic head and the magnetic storage section of the film, and a film feeding motor. In a prewind camera using a film with a magnetic storage unit, the film is disposed between the film feeding motor and the pressure contact member, and the film feeding motor is arranged in a direction in which the film is wound onto a film take-up spool of the camera. In conjunction with the rotation, the pressure contact member releases the pressure contact between the magnetic head and the magnetic storage portion of the film, and the film feeding motor rotates in a direction to rewind the film into the film cartridge. A prewind type camera using a film with a magnetic storage section, characterized in that a variable position member is provided which causes the pressure contact member to press the magnetic head and the magnetic storage section of the film in conjunction with each other.