JPH04178638A - Camera using film provided with magnetic storing part - Google Patents

Abstract

PURPOSE:To prevent the leading edge of a film from being caught by a guide member at the time of extruding a film from a film cartridge by providing a cartridge detecting means, a means for detecting the leading edge of the film and a position controlling means and inhibiting that the guide member is brought into press-contact with the edge surface of the film in its width direction by a press-contact means until it can be detected that the leading edge of the film is positioned at a prescribed position. CONSTITUTION:The film cartridge is loaded in a cartridge chamber 2, and when a back cover is closed, a cartridge detecting lever 21 is rotated to the left, and a controlling lever 20 is rotated to the right, but the right rotation is stopped by a film detecting lever 17. In this case, a pressure plate 7 is still positioned while being pushed downward since a releasing lever 13 is moved just a little in a direction shown by an arrow C, so that the film can be fed without any troubles. When the leading edge of the film 9 abuts on the arm part 17a of the lever 17, the lever 13 is moved in the direction shown by the arrow C, the guide part of the pressure plate 7 is made to press-contact with the lower end surface of the film, then, the readout/writing of the information from/to the magnetic storing part on the prescribed position of the film by the magnetic head can be accomplished.

Description

Detailed Description of the Invention (Field of Application of the Invention) The present invention relates to a magnetic head for writing or reading information to or from a magnetic storage section provided on a film, and a magnetic head configured integrally with the magnetic head, a guide member that regulates the position of the widthwise end face; a pressure contact unit that presses the guide member against the widthwise end face of the film; and a film leading edge detection unit that detects whether the leading end of the film is at a predetermined position. The present invention relates to an improvement of a camera using a film with a magnetic storage unit, which is equipped with a cartridge detection means for detecting whether or not a film cartridge is loaded into the camera.

(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 has been proposed as a new type of film cartridge in US Pat. No. 4,834,306.

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 is arranged coaxially with the film passing slit 37, the film 34 which is fixed at one end to the recess 38a of the film spool 38, and is wound around the film spool 38, and is arranged coaxially with 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 cartridge 35 from substantially contacting the inner wall 35a of the film cartridge 35, and a part of the holding member 39 is deformed to prevent the film from being restricted in the radial direction. The film spool includes a release member 40 that continuously releases the outer peripheral part, 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. The expansion of the outermost periphery due to loosening of the film 34 caused by the rotation of the film 38 in the film extrusion direction prevents slippage between the outer periphery of the film 34 and the holding member 39, applies force in the extrusion direction to the film 34, and causes the film cartridge 35 to This allows the film 34 to be ejected from the container.

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.
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 with a magnetic storage section, write photographic information such as shutter speed, aperture value, year, month and day, title, etc. in 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.

The above-mentioned magnetic storage section is arranged at a predetermined position parallel to the longitudinal direction of the film, and as the amount of information being written and read increases, the magnetic head must always be accurately positioned at the predetermined position on the film. be.

As a camera suitable for this purpose, the applicant has proposed
According to No. 4801, a pressure plate that fixes a magnetic head, is movable perpendicularly to the running direction of the film, is rotatable on a plane parallel to the film surface, and is equipped with a guide part that regulates the position of the film in the width direction. The previous patent application proposed a structure in which the pressure plate was pressed against the end surface in the width direction of the film using an elastic member such as a spring so that the magnetic head and the magnetic memory part of the film could be precisely positioned. are doing.

However, with the above structure, there are the following problems in the case of a camera using the above-mentioned thrust type cartridge.

In other words, when the film is pushed out, the leading edge of the film pushes down the guide member against the biasing force of an elastic member such as a spring, and then the guide member comes into contact with the end surface of the film. The film buckles due to the load when moving against the urging force of the member,
Otherwise, there is a possibility that the film may get caught there, making further film extrusion impossible.

(Object of the Invention) An object of the present invention is to solve the above-mentioned problems, and to solve the problem that when the film is extruded from the film cartridge, the leading edge of the film gets caught in the guide member and the film cannot be fed any further. It is an object of the present invention to provide a camera that uses a film with a magnetic storage section and uses a thrust type film cartridge that can prevent the above problems.

(Characteristics of the Invention) In order to achieve the above object, the present invention provides that when the cartridge detection means detects that a film cartridge is not loaded, the pressure contact means press-contacts the guide member to the end surface in the width direction of the film. If the cartridge detecting means detects that a film cartridge is loaded and the film leading edge detecting means detects that the leading edge of the film is at a predetermined position, the film width of the guide member is A position control means is provided that allows pressure contact to the end face in the width direction of the film, and the pressure contact means is prohibited from contacting the guide member with the end face in the width direction of the film until it is detected that the leading edge of the film is in a predetermined position. It is also characterized by the following:

(Embodiment of the Invention) Figures 1 to 7 show an embodiment of the present invention, and Figures 1, 4, and 6 are rear views of the camera with the back cover omitted; Figure 2 is a cross-sectional view of Figure 1 A-△, Figure 3 is Figure 1 B
-B sectional view, FIG. 5 is a sectional view of FIG. 4A and -A, and FIG. 7 is a sectional view of FIG. 6 A-A.

In these figures, 1 is a camera body, 2 is a cartridge chamber for storing a film cartridge 32 (described later), 3 is a film feeding fork that engages with the shaft (not shown) of the film car I-ridge 32, and 4 is a cartridge chamber for storing a film cartridge 32 (described later). Reference numeral 5.6 denotes a film spool for winding up the film 9, and support shafts 5.6 and 5.6 each have both ends fixed to appropriate positions on the camera body 1.
6 are arranged parallel to each other and perpendicular to the running direction of the film 9. The support shaft 5.6 in this embodiment has a cylindrical shape with a circular cross section as shown in FIG.

7 is a pressure plate, and its upper surface (the surface opposite to the surface that contacts the film 9) has a pair of locking portions 7a, 7 as shown in FIG.
b is provided. The locking portions 7a, 7b are composed of a vertical portion perpendicular to the pressure plate 7 and a horizontal portion bent outward at a right angle from the vertical portion, and have an oval cross-sectional shape, and project in the optical axis direction as a whole. Note that, as shown in FIG. 1, the locking portions 7a and 7b are arranged in a circular arc shape at symmetrical positions about the approximate center of the pressure plate 7 when viewed from above.

Here, the distance between the outer vertical parts of the locking parts 7a and 7b is 12
(See Figure 2) is the distance β between the inner sides of the support shafts 5.6
1 (see Fig. 1), and the support shaft 5.6 is connected to the vertical and horizontal parts of the locking parts 7a and 7b and the pressure plate 7.
It is located in a concave space between.

Therefore, the pressure plate 7 is movable in the vertical direction in FIG. ing. Further, the horizontal portions of the engaging portions 7a, 7b sandwich the support shaft 5.6 and regulate the front and rear positions of the pressure plate 7 in the optical axis direction, as shown in FIG.

Further, the pressure plate 7 is integrally provided with guide members 7c and 7d at both lower corners of the back side as shown in FIG. head 8
is fixed, and the magnetic gap of the magnetic head 8 is configured to be perpendicular to the film running direction.

1.0.11 is a spring which is a pressure contact means, and is arranged on the cartridge chamber 2 side and the film spool 4 side, respectively, with the center of rotation of the pressure plate 7 in between, and the negative end is attached to the camera body 1;
The other end is fixed to the pressure plate 7, and urges the pressure plate 7 upward in FIG. As a result, the guide members 7c and 7d provided on the pressure plate 7 are brought into pressure contact with the end surface of the film 9, so that the positional relationship of the pressure plate 7 with respect to the film 9 is always constant. A magnetic storage section (not shown) is formed horizontally in the longitudinal direction on the surface of the film 9 facing the pressure plate 7, and various information regarding photography is written (or read out) by the magnetic head 8. ). Reference numeral 12 denotes an outer rail (see FIG. 3), which regulates the upward position of the film 9.

13 is the dowel 14.1.5 of the camera body 1 and its elongated hole 1.
3a and 1.3b are slidably fitted release levers, and in the state shown in FIG.
Dowels 7e and 7f of the pressure plate 7 are placed on the flat parts 1.3d and 13g of f.
is locked, and the pressure plate 7 is in a depressed position. A spring 16 is fixed at one end to the release lever 13 and at the other end to the camera body 1, and biases the release lever 13 in the direction of arrow C in FIG.

] 7 is a film detection lever which is a means for detecting the leading edge of the film, and is rotatably attached to the camera body 1, and its arm 17a is used to detect when a part of the lever enters or withdraws from the film travel path. It is possible. A spring 18 has one end fixed to the film detection lever 17 and the other end fixed to the camera body 1, which applies an urging force to the film detection lever 17 to rotate it counterclockwise. Reference numeral 19 denotes a stopper provided on the camera body 1, which regulates the position of the film detection lever 17 when it is rotated to the left. A control lever 20 is rotatably attached to the camera body 1, and its arm 20b is connected to the arm 13i of the release lever 13, and its arm 20c is connected to the film detection lever 17.
It is possible to engage with the vertically bent portion 17c.

Reference numeral 21 denotes a cartridge detection lever rotatably attached to the camera body 1, one end 21a of which can be engaged with the arm 20a of the control lever, and the arm 21b movable into and out of the cartridge chamber 2. It has become. A spring 22 is attached at one end to the cartridge detection lever 21 and at the other end to the camera body 1, and provides a biasing force for clockwise rotation to the cartridge detection lever 21. Reference numeral 23 denotes a stopper provided on the camera body 1, which regulates the position of the cartridge detection lever 21 in clockwise rotation.

Note that the urging force of the spring 22 is the same as that of the control lever 20.
This is sufficiently larger than the biasing force of the spring 16 acting on the spring 16.

In the above configuration, the back cover (not shown) is opened by the photographer, and the thrust type film cartridge 32 is loaded into the cartridge chamber 2. As shown, when not in use, the entire film piece including the film league portion is stored in the cartridge 31, and the cartridge 32 is loaded into the camera body 1.
The film 9 is not moved into the cartridge 3 until the back cover 27 is closed and the driving force is transmitted from the film feeding fork 3.
2. It is configured to be pushed out.

When the film cartridge 32 is loaded into the cartridge chamber 2 and the back cover (not shown) is closed, the cartridge 32 comes into contact with the arm 21b of the cartridge detection lever 21 as the film cartridge 32 is loaded, and the cartridge detection lever 21 is activated. It rotates counterclockwise against the biasing force of the spring 22 as shown in FIG. Along with this, the control lever 20
The arm portion 20a is released from contact with the one end portion 21a of the cartridge detection lever 21 and attempts to rotate clockwise due to the biasing force of the spring 16, but the arm portion 20c touches the upright portion 17c of the film detection lever 17. Because they engage, clockwise rotation stops. In this case, since the release lever 13 moves only slightly in the direction of arrow C, its flat parts 13d and 13g remain in contact with the dowels 7e and 7f of the pressure plate 7, and the pressure plate 7
is still in the depressed position (as shown in Figure 1).

In the above-described state, when the film feeding fork 3 is rotated clockwise in FIG. 2 by a motor (not shown), the film cartridge 3 engaged with the fork 3 is rotated.
The two axes (not shown) rotate in the same direction. Therefore, the film 9 is pushed out of the film cartridge 32, and its leader portion enters the gap between the pressure plate 7 and the camera body 1. At this time, the lower end surface of the film 9 and the guide portion 7c
, 7d, there is a gap of a length, and the film is fed without any hindrance. This state is shown in FIGS. 4 and 5.

When the film 9 further moves to the right in FIG. It is rotated clockwise against the biasing force of the spring 18 to disengage the upright portion 17c from the control lever 20c (see FIG. 7). Here, since the spring 18 is for maintaining the engagement between the upright portion 17e and the arm portion 20e, a weak biasing force is sufficient. Therefore, the load required to rotate the film detection lever 17 clockwise at the leading end of the film 9 is small.

The vertical portion 17c of the film detection lever 17 and the control lever 2
0 disengages from the arm portion 20c, the release lever 13
is moved in the direction of arrow C by the biasing force of the spring 16. Then, the flat part] 36.13g and the dowel 7 of the pressure plate 7
The engagement with e and 7f is released as shown in FIG. 7, and the pressure plate 7
are urged upward in FIG. 6 by springs 10 and 11 so as to press the guide portions 7c and 7d against the lower end surface of the film, positioning the magnetic head 8 and the film, and positioning the film at a predetermined position by the magnetic head 8. It becomes possible to read or write information to the magnetic storage section.

Thereafter, the film 9 is further fed and wound around the film spool 4 by known means such as rubber rollers or claws, and normal photographing and the like are performed.

After shooting, insert film 9 into film cartridge 3.
1, the vertical part 1 of the film detection lever 17
7c contacts the circumferential portion 20d of the control lever 20.

Next, the film cartridge 32 is removed from the cartridge chamber 2.
When the cartridge is removed, the cartridge detection lever 21 is rotated clockwise by the biasing force of the spring 22, the control lever 20 is rotated counterclockwise, and the release lever 13 is moved leftward against the biasing force of the spring 16. At that time, the arm portion 13c of the release lever 13.

The slope parts 13e and 13f of 13f are the dowels 7e and 7 of the pressure plate 7.
f, presses down the pressure plate 7 against the biasing force of the spring 10.11, and presses the dowel 7 with the flat parts 13ci and 13g.
e and 7f, and holds the pressure plate 7 in the depressed position. This means that the state shown in FIG. 1 has been restored.

FIG. 8 shows a second embodiment of the present invention, and shows a first embodiment of the present invention.
The same parts as in FIGS. 7 to 7 are given the same reference numerals.

In FIG. 8, reference numeral 24 denotes a leaf spring whose one end is fixed to the camera body 1, which presses a film (not shown in FIG. 8) against the film spool 4 and assists in the loading of the film. Reference numeral 33 denotes a film detection lever, which is a means for detecting the leading edge of the film, and is rotatably attached to the camera body 1. Its arm 33a can come into contact with the leaf spring 24, and the film detection lever 33 is a film detection lever that is a means for detecting the leading edge of the film. The film detection lever 33 is configured to rotate clockwise as the leaf spring 24 deforms in the direction of the arrow.

With this configuration, after the film is wrapped around the film spool 4, the film detection lever 33 rotates clockwise, and the guide members 7c and 7d (not shown in FIG. 1) provided on the pressure plate 7
(not shown in FIG. 8) comes into pressure contact with the lower end surface of the film, so that the leading edge of the film or the guide member 7C comes into contact with the lower end surface of the film.

It won't get caught on 7d.

The camera of this embodiment uses the so-called briwinding method, in which the film is wound in advance on the film spool 4, and after the winding is completed, the film is rewound into the film cartridge while indexing the frame and photographing each frame. The method is assumed.

FIG. 9 shows a third embodiment of the present invention, and shows a first embodiment of the present invention.
The same parts as in FIGS. 8 through 8 are given the same reference numerals.

In FIG. 9, 25 is a photointerrupter for detecting the leading edge of the film. 26 is coil 2
6a is a plunger device equipped with a movable iron core 26b, and is a known device in which the movable iron core 26b is drawn into the coil 26a by energizing the coil 26a. 34 is a film detection lever which is a means for detecting the leading edge of the film;
It is rotatably attached to the camera body 1, and the bin 26c provided on the movable core 26b and the groove 34e provided in the arm portion 34d of the film detection lever are slidably fitted, and the movable core 26 It is configured to work in conjunction with.

When the leading edge of the film is detected by the photointerrupter 25, an electric control circuit (not shown) starts energizing the coil 26a, and the movable core 26b is drawn into the film 26a. Along with this, the film detection lever 34 rotates clockwise, and the guide members 7c, 7 shown in FIG.
d (not shown in FIG. 8) comes into pressure contact with the lower end surface of the film, so the leading end of the film will not be caught by the guide members 7c and 7d during film extrusion.

In this way, the leading edge of the film may be detected optically, or by releasing the control lever 20, that is, by releasing the guide member 7 of the pressure plate 7.
The start of pressure contact with the end face of the film c and 7d may be performed using a driving source such as a plunger device.

According to each of the above embodiments, when the film cartridge is not loaded, the guide member is retracted out of the travel trajectory of the film, and when the film cartridge is loaded, the leading edge of the film is pushed out from the cartridge to a predetermined position (e.g. After passing through the guide member (position where the guide member is placed), the guide member is pressed against the end face in the width direction of the film. The problem of film feeding becoming impossible is eliminated.

(Correspondence between the invention and the embodiments) In this embodiment, the guide members 7c and 7d correspond to the guide members of the present invention, the springs 10 and 11 correspond to the pressure contact means, and the release lever 3 corresponds to the position control means.

(Effects of the Invention) As explained above, according to the present invention, when the cartridge detection means detects that a film cartridge is not loaded, the pressure contact means press-contacts the guide member to the end surface in the width direction of the film. When the cartridge detecting means detects that a film cartridge is loaded and the film leading edge detecting means detects that the leading edge of the film is at a predetermined position, the film width of the guide member is A position control means is provided to allow the guide member to be pressed against the end surface in the width direction of the film, and the pressure contact means is prohibited from pressing the guide member against the end surface in the width direction of the film until it is detected that the leading edge of the film is at a predetermined position. Therefore, when the film is extruded from the film cartridge, it is possible to prevent the leading end of the film from getting caught in the guide member and making it impossible to further feed the film.

[Brief explanation of the drawing]

1, 4, and 6 are rear views of the camera according to the first embodiment of the present invention, with the back cover omitted; FIG. 2 is a sectional view taken along line A-A in FIG. 1; and FIG. FIG. 1 is a sectional view taken along line B-B, FIG. 5 is a sectional view taken along line AA in FIG. 4, FIG. 7 is a sectional view taken along line AA in FIG. 9 is a cross-sectional view of a camera according to a third embodiment of the present invention, FIG. 10 is a vertical cross-sectional view of a film cartridge used in an embodiment of the present invention, and FIG. 11 is a cross-sectional view of the same. Similarly, FIG. 12 is a side view thereof. 1...Camera body, 3...Fork,
4...Film fork, 7...Press plate, 7c, 7d...Guide member, 8...
Magnetic head, 9... film, bling, 13
...Release lever, 17...Film detection lever, 20...Control lever, 21...
...Cartridge detection lever, 32...Thrust type film cartridge, 33.34...Film detection lever.

Claims (1)

[Claims] (1) a magnetic head disposed movably at least in a direction perpendicular to the film running direction on the same plane as the film running direction, and for writing or reading information to or from a magnetic storage section provided on the film; a guide member configured integrally with the magnetic head and regulating the position of the end surface in the width direction of the film; a pressure contact means for pressing the guide member against the end surface in the width direction of the film; In a camera using a film with a magnetic storage unit, the camera is equipped with a film leading edge detecting means for detecting whether a film cartridge is loaded into the camera, and a cartridge detecting means for detecting whether a thrust-type film cartridge is loaded in the camera. If the means detects that the film cartridge is not loaded, prohibiting the pressing means from pressing the guide member against the end surface in the width direction of the film;
When the cartridge detecting means detects that a film cartridge is loaded and the film leading edge detecting means detects that the leading edge of the film is at a predetermined position, the film width of the guide member is determined by the pressure contacting means. 1. A camera using a film with a magnetic memory section, characterized in that it is provided with a position control means that allows pressure contact with a directional end surface.