JPH04285944A - Camera using film with magnetic storage part - Google Patents

Abstract

PURPOSE:To achieve the miniaturization of a camera and simultaneously to eliminate the generation of unpleasant noise produced at the time of the pressurized-contact of a film with a magnetic head and the releasing by using no motor so that the conditions of a pressurized-contact means are changed by using a shape memory alloy instead of a motor. CONSTITUTION:The camera is provided with an elastic member 9 or the shape memory alloy 10 for allowing the pressurized-contact means 3, 4, 6 and 7 to be changed in a first condition so that the film 1 is in pressurized-contact with the magnetic head 2, and for allowing the pressing means to be changed in a second condition from the first condition so that the pressurized-contact of the film with the magnetic head is released and an energization control means for controlling the energizing of the shape memory alloy when the conditions of the pressurized-contact means are changed.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a magnetic storage unit comprising a magnetic head for writing information to or reading information from a magnetic storage unit provided on a film, and pressure contact means for pressing the film and the magnetic head together. This invention relates to a camera that uses attached film.

0002

[Prior Art] In recent years, films having a magnetic storage area have been used, and information such as date, shutter speed, aperture value, etc., can be written on the magnetic storage area using a magnetic head, and this information can be written as needed. A camera that can read information and read out information that has been written since the beginning was published in U.S. Patent No. 4.
It has been proposed in No. 864332, etc.

[0003] In this type of camera, since there is a possibility that information cannot be reliably written to or read out from the film, the applicant of the present application has developed a method for pressing a pad (pressing member) made of an elastic material against the film surface. The pad is configured to move forward and backward, and when reading or writing information, the pad is advanced into the film surface and the film surface is brought into pressure contact with the magnetic head,
An earlier patent application (patent application No. 2003) that solved the above problems was developed
-76965).

0004

However, in the camera constructed as described above, since a motor is used to drive the pad that brings the film into pressure contact with the magnetic head, there are the following problems.

1) Since the motor is quite expensive and has a considerable volume, it leads to an increase in the size of the camera.

2) In order to drive the pad, a reduction gear system must be incorporated instead of a motor alone, which also leads to an increase in the size of the camera.

3) The motor is noisy.

An object of the present invention is to achieve downsizing of the camera, to be able to reliably press and release the film and the magnetic head, and to avoid the noise that is bothersome when the film and the magnetic head are pressed and released. It is an object of the present invention to provide a camera using a film with a magnetic storage section that does not generate.

[0009]

[Means for Solving the Problems] The present invention provides an elastic member or a shape memory alloy for changing the pressure contact means to a first state so as to press the film and the magnetic head, and a film and the magnetic head. A shape memory alloy or an elastic member for changing the pressure contact means from the first state to the second state so as to release the pressure contact, and energization to the shape memory alloy when changing the state of the pressure contact means. An energization control means for performing control is provided.

0010

[Operation] When changing the state of the pressure welding means, the energization control means controls the energization to the shape memory alloy, thereby changing the shape of the shape memory alloy by utilizing the temperature difference generated in the shape memory alloy. Depending on the relationship between the elastic member and the shape memory alloy, the state of the pressure contact means is changed from the first state to the second state, or from the second state to the first state. In other words, releasing the pressure contact between the film and the magnetic head,
The structure is such that the film and the magnetic head are brought into pressure contact.

[0011]

[Embodiment] FIGS. 1 to 4 show a first embodiment of the present invention. FIG. 3 is a plan view showing the positional relationship of each member when the magnetic head is not driven, and FIG. 4 is a plan view when the magnetic head is driven. It is a top view showing the positional relationship of each member.

In FIGS. 3 and 4, 1 is a film having a magnetic storage section, 2 is a magnetic head for reading information from and writing information into the magnetic storage section, and 3 is an elastic member. It is a pad made of aluminum, and the surface that comes into contact with the film is extremely slippery.

4 has fixing pins 5a, 4b in the long holes 4a, 4b.
5b is a lever that is fitted and configured to be slidable in the vertical direction in FIG. The lever 4 has protrusions 4c and 4d, and a spring 6 is applied to the protrusion 4c, so that the lever 4 is always
is biased upward. Further, in the state shown in FIG. 3, the protruding portion 4d is in contact with the arm portion 7 of the lever 7, which will be described later, so that the lever 4 is prevented from moving in the direction of the arrow by the spring 6.

7 has fixing pins 8a, 7b in its long holes 7a, 7b.
8b is a lever that is fitted and configured to be slidable in the vertical direction in FIG. 3, and is always urged downward in FIG. 3 by a spring 9. Further, the downward biasing of FIG. 3 by the spring 9 is regulated by the fixing pin 8a.

10 is a shape memory alloy provided between the end 7c of the lever 7 and the camera body, and both ends thereof are
The wires are wired by lead wires 11a and 11b. Figure 4 is Figure 3
Lead wires 11a, 11b to the shape memory alloy 10
When electricity is applied through the shape memory alloy 10 and the temperature rises, the shape memory alloy 10
FIG. 3 shows the shape memory alloy 1 when it has returned to its original length.
When the current is removed from the spring 9 and the temperature drops, the spring 9 is in a stretched state.

In the above configuration, when the magnetic head 2 is not writing or reading information to or from the magnetic storage portion of the film 1, the shape memory alloy 10 is not energized, and therefore each member is not energized as shown in FIG. The situation is as follows.

When writing or reading information to or from the magnetic storage portion of the film 1 using the magnetic head 2, the shape memory alloy 10 is energized through the lead wires 11a and 11b. Then, as shown in FIG. 4, the shape memory alloy 10 returns to its original length, so the lever 7 is moved upward in FIG. 4 against the force of the spring 9. become. When the lever 7 moves upward in FIG. 4 in this way, the position of the lever 4 is no longer restricted by the arm 7f of the lever 7, so the lever 4 also follows the biasing force of the spring 6 as shown in FIG. moves upward, and the pad 3 fixed to the tip comes into contact with the film 1. At this time, since lever 7 has a larger movement distance than lever 4, film 1
A predetermined pressure is applied by the spring 6 to the magnetic head 2.
and film 1 are pressed together (state shown in Figure 4)
.

When the pad 3 is to be separated from the film 1 again, the current supply to the shape memory alloy 10 may be stopped.

FIG. 1 shows a circuit block in a first embodiment of the present invention.

In FIG. 1, 50 is a control circuit for controlling various operations of the camera, 51 is a photometry circuit, 52 is a distance measurement circuit,
53 is a shutter control circuit that controls opening and closing of the shutter;
4 is a head drive circuit that drives the magnetic head 2 to read information from or write information to the magnetic storage section provided on the film 1; 55 is a feeding module that winds or rewinds the film 1; - a feeding motor drive circuit that controls the forward and reverse rotation of the motor 56; and a pad position control circuit 57 that controls energization of the shape memory alloy 10 to move the pad 3 into or out of one surface of the film; Shape memory alloy drive circuit for
SW1 is a switch that is turned on by the first stroke of a release button (not shown), and SW2 is a switch that is turned on by the second stroke of the release button.

Next, the control circuit 50 in the first embodiment
The operation will be explained using the flowchart of FIG. “Step 101” Press the first release button (not shown)
It is determined whether the switch SW1, which is turned ON by the stroke, is ON or not, and when it is determined that the switch SW1 is ON, the process proceeds to step 102. "Step 102" The photometry circuit 51 is driven to obtain photometry information, and the distance measurement circuit 52 is driven to obtain distance information (distance measurement information) to the subject. “Step 103” Press the second release button (not shown)
It is determined whether the switch SW2, which is turned ON by the stroke, is ON or not, and when it is determined that the switch SW2 is ON, the process proceeds to step 104. If it is not turned on, the process returns to step 101. "Step 104" The focus of the photographing lens is adjusted based on the distance measurement information obtained in step 102, and the opening and closing of the shutter is controlled via the shutter control circuit 53 based on the photometry information. In other words, an exposure operation is performed. "Step 105" Electricity is applied to the shape memory alloy 10 via the shape memory alloy drive circuit 57, and the shape memory alloy 10 is shrunk as shown in FIG. As a result, the pad 3 fixed to the tip of the lever 4 moves upward in FIG. 4 as described above, and brings the film 1 surface (magnetic storage section) into pressure contact with the magnetic head 2. "Step 106" The feed motor 56 is driven via the feed motor drive circuit 54 to start winding one frame of the film 1. "Step 107" During the above-mentioned film feeding, photographing information such as shutter speed, aperture value, photographing date, etc. is sent to the magnetic head 2 via the head drive circuit 54, and the film 1 is
(or read information as necessary). At this time, as already mentioned, since the surface of the film is pressed against the magnetic head 2 by the pad 3, information can be written accurately. "Step 108" It is determined whether writing of the necessary photographic information has been completed, and upon completion, the process proceeds to step 109. Also, if it is not finished, step 1
Return to 07. "Step 109" The drive of the magnetic head 2 is stopped via the head drive circuit 54. "Step 110" It is determined whether or not the film winding for one frame has been completed, and upon determining that it has been completed, the process proceeds to step 111. If the process has not been completed, the process remains at step 107. "Step 111" The drive of the feed motor 56 is stopped via the feed motor drive circuit 54. This completes the winding of the film 1. “Step 112” The power supply to the shape memory alloy 10 via the shape memory alloy drive circuit 57 is stopped. As a result, the shape memory alloy 10 is stretched by the spring 9, and the levers 7 and 4 move downward in FIG. situation).

5 to 8 show a second embodiment of the present invention, FIG. 7 is a plan view showing the positional relationship of each member when the magnetic head is not driven, and FIG. 8 is a plan view when the magnetic head is driven. It is a top view showing the positional relationship of each member. Parts that move in the same way as in FIGS. 3 and 4 are given the same reference numerals.

12 is constructed such that fixing pins 16a and 16b are fitted into elongated holes 12a and 12b so that it can slide in the left-right direction in FIG. has a shape. Further, the lever 12 has arm portions 12d and 12e.

13 is the camera body and the arm 12 of the lever 12.
The lever 12 is biased to the left in FIG. 7 by a spring disposed between e, and movement in this direction is prohibited by the contact between the pin 16a and the elongated hole 12b as shown in FIG. has been done.

Reference numeral 14 indicates the camera body and the arm portion 12 of the lever 12.
d, and both ends of the shape memory alloy are provided between the
It is wired by wires 15a and 15b. Figure 8 is Figure 7
Lead wires 15a, 15b to the shape memory alloy 14
When electricity is applied through the shape memory alloy 14 and the temperature rises, the shape memory alloy 14
FIG. 7 shows the shape memory alloy 1 when it has returned to its original length.
4 is de-energized and the temperature drops, causing the spring 13 to
It is in a stretched state according to the bias of.

In the above configuration, when the shape memory alloy 10 is energized, the shape memory alloy 10 contracts in the same manner as described above, and the lever 7 moves upward in FIG. -4 also moves in the same direction, and the pad 3 brings the first surface of the film into pressure contact with the magnetic head 2. Also,
When the lever 7 moves upward in FIG.
The arm 7g of the lever 12 comes into contact with the tip 12c of the lever 12, pushes the lever 12 to the right in FIG.
The lever 12 is moved by the spring 13 at the place where the arm 7g has passed as shown in Fig. 7.
7g of the lever 7 and the tip 12c of the lever 12 come into contact with each other (the state shown in FIG. 8). Therefore, even if the current supply to the shape memory alloy 10 is stopped in this state, the lever 7 will be locked at this position. Therefore, the pressing state of the film 1 surface against the magnetic head 2 by the pad 3 is maintained, and a power saving effect can be obtained.

When the pad 3 is separated from the surface of the film, the shape memory alloy 14 is energized to remove the shape memory alloy 14.
is contracted as shown in FIG. 7, so the lever 12 moves to the right in FIG.
The lever 7 returns to its original position under the bias of the spring 9, and at this time the lever 4 is biased downward in FIG. becomes.

FIG. 5 shows a circuit block in a second embodiment of the present invention. Parts having the same functions as in FIG. 1 are given the same reference numerals.

In FIG. 5, 58 is the shape memory alloy 1
Shape memory alloy drive for controlling the energization to 4 to decide whether to keep the lever 7 in the state shown in FIG. It is a circuit.

Next, the operation of the control circuit 50 in this second embodiment will be explained using the flowchart of FIG. “Step 201” Press the first release button (not shown)
It is determined whether or not the switch SW1, which is turned on by the stroke, is turned on, and when it is determined that it is turned on, the process proceeds to step 202. "Step 202" The photometry circuit 51 is driven to obtain photometry information, and the distance measurement circuit 52 is driven to obtain distance information (distance measurement information) to the subject. "Step 203" Press the second release button (not shown)
It is determined whether the switch SW2, which is turned ON by the stroke, is ON or not, and when it is determined that the switch SW2 is ON, the process proceeds to step 204. If it is not turned on, the process returns to step 201. "Step 204" The focus of the photographing lens is adjusted based on the distance measurement information obtained in step 202, and the opening and closing of the shutter is controlled via the shutter control circuit 53 based on the photometry information. In other words, an exposure operation is performed. "Step 205" Electricity is applied to the shape memory alloy 10 via the shape memory alloy drive circuit 57, and the shape memory alloy 10 is shrunk as shown in FIG. As a result, the pad 3 fixed to the tip of the lever 4 as described above moves upward in FIG.
It will come into pressure contact with the "Step 206" Here, it is determined whether a predetermined time has elapsed for the lever 7 to move to the state shown in FIG. 8. When the predetermined time has elapsed, the process advances to step 207. “Step 207” The power supply to the shape memory alloy 10 via the shape memory alloy drive circuit 57 is stopped. Even if the current supply is stopped in this manner, the state shown in FIG. 8, that is, the state in which the pad 3 presses the surface of the film against the magnetic head 2 is maintained as described above. "Step 208" The feed motor 56 is driven via the feed motor drive circuit 54 to start winding one frame of the film 1. "Step 209" During the film feeding described above, photographing information such as shutter speed, aperture value, photographing date, etc. is sent to the magnetic head 2 through the head drive circuit 54, and the film 1 is
(or read information as necessary). At this time, as already mentioned, since the surface of the film is pressed against the magnetic head 2 by the pad 3, information can be written accurately. "Step 210" It is determined whether writing of the necessary photographic information has been completed, and upon completion, the process proceeds to step 211. Also, if it is not finished, step 2
Return to 09. "Step 211" The drive of the magnetic head 2 is stopped via the head drive circuit 54. "Step 212" It is determined whether or not the film winding for one frame has been completed, and upon determining that it has been completed, the process proceeds to step 213. If the process has not been completed, the process remains at step 212. "Step 213" The drive of the feed motor 56 is stopped via the feed motor drive circuit 54. This completes the winding of the film 1. “Step 214” The shape memory alloy 14 is energized via the shape memory alloy drive circuit 58. As a result, the shape memory alloy 14 gradually shrinks to its original state. "Step 215" Here, lever 7 and lever 12
It is determined whether or not a predetermined period of time has elapsed during which the locking state between the terminal and the terminal is released. When the predetermined time has elapsed, the process advances to step 216.

At this point, the shape memory alloy 14 has completely shrunk to its original state;
0 is not energized, so levers 7 and 1
2 is released and the levers 7 and 4 move downward in FIG. 7 under the bias of the spring 9, so that the pad 3 is separated from the surface of the film 1 ( state in Figure 7). “Step 216” The power supply to the shape memory alloy 14 via the shape memory alloy drive circuit 58 is stopped.

According to each of the above embodiments, the shape memory alloy 1 is used instead of the motor to retract the pad 3 from one surface of the film.
Since 0 is used, the following effects can be obtained.

1) Space becomes very small.

2) Cost is reduced because reduction gears and the like are not required.

3) Unlike the motor, pad 3 is connected to film 1.
There is no sound when entering or retreating from a surface.

Further, as in the second embodiment, the shape memory alloy 14 and the lever 13 that moves by the expansion and contraction of the shape memory alloy 14 are further provided.
By adopting a structure that includes the following, it becomes possible to obtain further power saving effects.

(Modifications) In each of the above embodiments, the pad 3 was made movable relative to the film 1 surface in order to bring the film 1 and the magnetic head into pressure contact, but the magnetic head 2
It may be configured to be able to move forward and backward.

In addition, the shape memory alloy 10 is used as a means for advancing the pad 3 into the first surface of the film, and the spring 9 is used as a means for retracting the pad 3 from the first surface of the film, but this structure is reversed. You can also do it. At this time, the urging direction of the spring 6 and the engagement position of the lever 4 and the lever 7 are reversed in the vertical direction in FIG. 3, for example, and the spring pressure balance between the spring 6 and the spring 9 needs to be taken into consideration. Needless to say.

[0039]

[Effects of the Invention] As explained above, according to the present invention,
an elastic member or a shape memory alloy for changing the pressure contact means to the first state so as to press the film and the magnetic head; and a pressure contact means for changing the pressure contact means to the first state so as to release the pressure contact between the film and the magnetic head. A shape memory alloy or an elastic member for changing the state from one state to a second state, and an energization control means for controlling energization to the shape memory alloy when changing the state of the pressure welding means are provided, and the pressure welding means is When changing the state, the power supply to the shape memory alloy is controlled, and the shape of the shape memory alloy is changed by using the temperature difference generated in the shape memory alloy, and the relationship between the elastic member and the shape memory alloy is changed. , the pressure contact means is changed from the first state to the second state, or from the second state to the first state. That is, the pressure contact between the film and the magnetic head is released, or the film and the magnetic head are brought into pressure contact. Therefore, since there is no need to use a motor as in the conventional case, the camera can be made smaller. Similarly, since no motor is used, there is no need to worry about the generation of noise when the film and magnetic head are brought into contact with each other and released.

[Brief explanation of the drawing]

FIG. 1 is a circuit block diagram of a camera showing a first embodiment of the present invention.

FIG. 2 is a flowchart showing the operation of the control circuit of FIG. 1;

FIG. 3 is a plan view showing the positional relationship of each member when the magnetic head is not driven in the first embodiment of the present invention.

FIG. 4 is a plan view showing the positional relationship of each member during driving of the magnetic head in the first embodiment of the present invention.

FIG. 5 is a circuit block diagram of a camera showing a second embodiment of the present invention.

FIG. 6 is a flowchart showing the operation of the control circuit of FIG. 5;

FIG. 7 is a plan view showing the positional relationship of each member when the magnetic head is not driven in a second embodiment of the present invention.

FIG. 8 is a plan view showing the positional relationship of each member when driving a magnetic head in a second embodiment of the present invention.

[Explanation of sign]

1 Magnetic head 2 Film 3 Pad 4,7 Lever 9 Spring 10 Shape memory alloy 12 Lever 13 Spring 14 Shape memory alloy 50 Control circuit 57, 58 Shape memory alloy drive circuit

Claims (1)

[Claims] 1. In a camera using a film with a magnetic storage section, the camera is equipped with a magnetic head for writing or reading information into a magnetic storage section provided on the film, and a pressure contact means for pressing the film and the magnetic head into contact with each other. , an elastic member or a shape memory alloy for changing the pressure contact means to the first state so as to press the film and the magnetic head; A shape memory alloy or an elastic member for changing the state from the first state to the second state, and an energization control means for controlling energization to the shape memory alloy when changing the state of the pressure contact means. A camera using a film with a magnetic memory section.