JP3472011B2 - camera - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera in which information can be written in or read from a magnetic recording portion of a film by a magnetic head, and more particularly to a structure for fixing the magnetic head to a pressure plate.

[0002]

2. Description of the Related Art A camera has been proposed in which a transparent magnetic material is coated on a photographic film and information for identifying the film and information for identifying an image printed on the film can be magnetically recorded. For example, when a film is loaded into a camera and a picture is taken, the picture-taking conditions are recorded by a recording head provided in the camera, which can be used as a reference at the time of a printing process on photographic paper.

A fixing structure of a magnetic head for performing magnetic recording on this film is described in, for example, USP5005031. In this fixed structure, the film to be fed is pressed against the aperture part of the main body that determines the shooting screen size of the camera, and a pressure plate that maintains flatness is provided with a hole of a size equivalent to the head part, and the head part of the recording head is fixed. After the insertion, the adhesive was applied from the back side to the periphery of the holes of the recording head and the pressure plate and fixed.

6 and 7 are views showing a fixed state of a conventional recording head, FIG. 6 is a schematic sectional view of an aperture portion of a camera body, and FIG. 7 is an enlarged view of a recording head fixing portion.

A film 21 is loaded in the camera body 20. The recording head 22 is provided with a hole 23a that is slightly larger than the recording head 22 provided on the pressure plate 23, and
The second head portion 22 a is in contact with the back surface of the film 21.

The film 21 includes a spring 2 from the front side of the camera.
It is pressed against the head portion 22a by the pad 24 fixed to the unit 5. The recording head 22 is adhesively fixed to the pressure plate 23 by an adhesive 26 on its side surface.

[0007]

In the structure of the fixed portion of the recording head as in the above-mentioned conventional example, the hole 23a of the pressure plate 23 adjusts the recording head 22 with respect to the film 21 in the X and Y directions. It is formed to be larger than the outer shape of the head 22. For this reason, at the time of bonding, the adhesive easily flows out from the gap between the hole 23a of the pressure plate 23 and the recording head 22 to the film side, so that the amount of the adhesive 26 applied tends to be small and the adhesive strength of the recording head 22 may be weakened. Conceivable.

The applied adhesive 26 may also stick out to the film surface side, so that the adhesive work is carefully performed in order to prevent scratches on the film due to this and to prevent erroneous writing of recorded information. It has been necessary to increase the work time and increase the defective rate after bonding.

Further, it is possible to prevent erroneous writing of data due to static electricity generated by rubbing of the film and the pressure plate when the film is fed at the end of photographing, an external magnetic field, or an external electric field.
Or, to reduce it, by adding a shield member,
It led to an increase in cost.

An object of the invention according to the present application is to provide a camera in which a magnetic head is fixed to a pressure plate so that magnetic information written by such a recording head can be written on a film more reliably.

[0011]

A structure for realizing the object of the invention according to the present application is a magnetic recording element for recording or reading magnetic information on a film, and a film on which the magnetic recording element is held and fixed. A pressure plate for ensuring the flatness of the film, and around the at least part of the mounting hole of the same shape as the magnetic recording element on which the magnetic recording element formed on the pressure plate is mounted, the film side and Forms a wall portion extending to the opposite side and bonds the wall portion and the magnetic recording element to each other.
Using an adhesive agent, and attach it to the mounting hole of the pressure plate as described above.
A camera is characterized by fixing a magnetic recording element .

[0012] In the above configuration, the pressure plate is formed of a metal, characterized in that the piezoelectric plate is grounded.

With the above structure, the magnetic recording element such as the recording head is fixed to the magnetic recording element such as the recording head more steadily by increasing the adhesive and the bonding area between the pressure plate and the magnetic recording element.
It is possible to secure a strong adhesive force that can withstand the load such as the pressing force of the pad that presses the film against the magnetic recording element such as the recording head.

Further, by grounding the metal pressure plate,
By covering the periphery of the side surface of the magnetic recording element such as the recording head with a metal wall, the recording head can be shielded from static electricity and the like generated by film feeding and the like, and a magnetic information writing error can be prevented.

[0015]

DETAILED DESCRIPTION OF THE INVENTION

(First Embodiment) FIGS. 1 to 5 show a first embodiment.

FIG. 1 is a perspective view showing a recording head and a pressure plate, FIG. 2 is a front view of a pressure plate to which the recording head is fixed, FIG. 3 is a sectional view of a recording head fixing portion, and FIG. 4 is an enlarged sectional view of the recording head fixing portion. FIG. 5 shows a magnetically recorded film.

Reference numeral 1 denotes a magnetic head for writing individual photographing information on a film 3 having a back surface coated with a transparent magnetic material. Reference numeral 2 denotes a photographing position of the film 3 so that the film 3 is perpendicular to the optical axis. A pressure plate for correcting the curl, 4 is a camera body, 5 is a pad for pressing the film 3 against the recording head 1 while preventing the increase of the feeding load and film scratches when the film 3 is fed, 6 Is a spring which is fixed to the pad and generates a pressing force of the pad 5 against the film 3, and 7a, 7b and 7c are photographing screens photographed on the film 3.

Reference numerals 8a, 8b and 8c denote magnetic data writing portions for photographing information of the respective photographing screens 7a to 7c written by the magnetic head 1 on the transparent magnetic body on the back surface of the film of FIG. Perforation holes 3a, 3b, 3c that determine the stop position of the film 3 with respect to the aperture 4a that determines the shooting screen size of the camera body 4.
have. An adhesive 10 fixes the recording head 1 to the pressure plate 2. 11 is a pressure plate 2 and a ground pattern substrate 1
It is a ground screw that fastens 2 together with the main body.

With the above structure, the mounting hole 2e of the recording head 1 of the pressure plate 2 is provided with the bent portions 2a, 2b, 2c and 2d extending to the opposite side to the surface contacting the film 3.

The recording head 1 is inserted into the mounting hole 2e so as to expose the writing portion 1a of the recording head 1 which contacts the film 3. Then, with respect to the reference hole 2f of the pressure plate 2 and the front surface of the pressure plate 2, the recording head 1 is moved to X,
Adjustment in the Y, Z, and θ directions is performed with a dedicated tool (not shown), and adhesively fixed.

The pressure plate 2 to which the recording head 1 is adhered and fixed is
A plurality of screws (not shown) fix the camera body 4 with screws. Ground screw 1 which is one of these screws
1, the screw holes of the pressure plate 2 and the screw holes 12a of the circuit board 12 arranged on the back surface side of the pressure plate 2 are fastened together to the camera body 4, and the ground pattern 12a exposed on the surface of the circuit board 12 and the pressure plate 2 are exposed. Are electrically connected, and the entire pressure plate 2 is grounded.

When the pressure plate 2 is grounded, the recording head 1 is provided with a shield effect by the surrounding bent portions 2a, 2b, 2c and 2d, and thereafter the pad 5 fixed to the spring 6 is recorded from the front side of the camera body 4. It is arranged so as to be pressed against the front surface of the head 1 with a slight force.

After the camera is completed, when the film 3 having the back surface coated with the transparent magnetic material in a predetermined range is loaded into the camera,
The film 3 is fed by a film feeding mechanism (not shown), and the film is stopped at a predetermined position by detecting the perforation holes 3a and 3b, and the preparation for photographing is completed.

Next, an image is exposed on the photographing screen 7a (7b, 7c) of the film 3 by a photographing start operation, and photographing information at the time of exposure is stored in the camera. After shooting, one frame of film 3 is fed in preparation for the next shooting. The magnetic head 1 interlocks with this feeding operation to write the magnetic data stored in the camera into a band-shaped magnetic data. Part 8a,
It is written in 8b and 8c. The film 3 is pressed against the magnetic head 1 by a spring 6 and a pad 5 so that magnetic recording is surely performed.

In this embodiment, the standing bending portion 2 of the pressure plate 2 is
a, 2b, 2c, the recording head 1 in the 2d by bonding as in FIG. 4, the adhesive 10, the bending height of the vertical folded portion 2a, 2b, 2c, 2d with respect to the front surface of the pressure plate 2 Since they can be bonded at a distance apart, the adhesive 10 can be applied sufficiently,
The adhesive strength between the recording head 1 and the pressure plate 2 can be enhanced, and the adhesive 10 is used to attach the recording head 1 and the pressure plate 2 to the mounting holes 2.
There is less concern that it will flow out from the gap e to the front surface of the pressure plate 2 in contact with the film, and the process work will be very easy.

Further, the circuit board 1 is provided with the ground screw 11.
Since the grounding pattern 12a of 2 and the pressure plate 2 are electrically connected, the entire pressure plate 2 is grounded, and the bent portion 2a of the pressure plate 2 is
The recording head 1 surrounded by 2b, 2c and 2d is shielded from internal static electricity, external magnetic field and external electric field.

(Relationship between Configuration of Embodiment and Claims) The magnetic head 1 in the embodiment corresponds to the magnetic recording element in the claims, the pressure plate 2 corresponds to a pressure plate, and the mounting holes 2e are mounting holes. The bent portions 2a, 2b,
2c and 2d correspond to walls.

The present invention is applicable to various types of cameras such as single-lens reflex cameras, lens shutter cameras, video cameras,
Furthermore, for optical devices and other devices other than cameras, further for those cameras, optical devices and other devices, and for devices applied to those cameras, optical devices and other devices, or for elements constituting these. Can also be applied.

Further, the present invention is such that the whole or part of the configuration of the claims or the embodiments forms one device and is combined with another device. It may be present or may be an element constituting the device.

[0030]

According to the inventions of claims 1 and 2, the first
The it is possible to improve the adhesive strength for bonding the magnetic recording element in the pressure plate to planarize the photographic film, static electricity generated when the second film feeding and the external magnetic field, the magnetic recording data due to the influence of an external electric field The erroneous recording prevents the erroneous recording of the magnetic recording data by the shield effect of the bent portion of the metal pressure plate.

As a result, the magnetic recording data written on the photographic film can be made highly reliable.

When the magnetic recording element is bonded to the pressure plate,
The workability of the adhesive application process is greatly improved, the man-hours can be reduced, and the defective rate of the adhesive protruding to the pressure plate film side can be significantly reduced. In addition, internally generated electric field and external electric field,
The magnetic field shield can also be effective without adding any special parts or electric parts, and thus can greatly reduce the cost.

[Brief description of drawings]

FIG. 1 is a perspective view showing an arrangement of a pressure plate and a recording head in a camera according to a first embodiment of the present invention.

FIG. 2 is a front view in which a recording head is fixed to a pressure plate in the camera of the first embodiment.

FIG. 3 is a sectional view of the mounting portion of the recording head in the camera of the first embodiment.

FIG. 4 is an enlarged cross-sectional view of a recording head mounting portion in the camera of the first embodiment.

FIG. 5 is a plan view of a film used in the camera of the first embodiment.

FIG. 6 is a sectional view of a mounting portion of a conventional recording head.

FIG. 7 is an enlarged cross-sectional view of a mounting portion of a conventional recording head.

[Explanation of symbols]

1 ... Recording head 2 ... Pressure plate 3 ... film 4 ... Camera body 5 ... Pad 6 ... Spring 8a, 8b, 8c ... Magnetic recording data writing section 10 ... Adhesive 11 ... Ground screw 12 ... Ground pattern substrate

Continuation of the front page (56) Reference JP-A-4-285941 (JP, A) JP-A-6-118500 (JP, A) JP-A-4-114137 (JP, A) JP-A-7-64168 (JP , A) JP-A-8-122904 (JP, A) JP-A-3-504421 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) G03B 17/24 GAP

Claims (2)

(57) [Claims] 1. A magnetic recording element for recording or reading magnetic information on a film, and a pressure plate for ensuring the flatness of the film on which the magnetic recording element is held and fixed. around at least a portion of the mounting hole portion of the magnetic recording element having substantially the same shape formed magnetic recording element is mounted, and the film side to form a wall portion extending to the opposite side, the said wall portion magnetic Adhesive with recording element using adhesive
The magnetic recording element in the mounting hole of the pressure plate.
A camera characterized by being fixed . 2. The method of claim 1, a camera, characterized in that the pressure plate is formed of metal and grounded piezoelectric plate.