JP2805738B2 - Camera and camera control device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera that can use a film with a magnetic storage unit, and a control device for the camera.

(Background of the Invention) In recent years, a film having a magnetic storage unit has been used, and photographing information such as shutter time, aperture value, date, title, and the like are written into the magnetic storage unit by a magnetic head, and if necessary, this information is written. U.S. Patent No.
It is proposed in 4864332 and others.

Also, US Pat. No. 4,780,075 proposes the following.

After the photographing (exposure) is completed, the information to be "exposed" is written into the magnetic storage unit corresponding to each frame by the magnetic head, and the film cartridge is rewound once in the middle of the film, and the film cartridge is re-mounted. When the camera is used by loading it into a camera, whether the frame is exposed or unexposed is detected based on whether the "exposed information" has been written or not, and the photographing from the unexposed frame is performed. The unexposed frame is located at the aperture position.

Also, in U.S. Pat.No. 4,878,075, it is proposed that magnetic information is used to read out film information such as ISO information and the number of film frames pre-written on the film, and various controls of the camera are automatically performed based on the information. .

However, when trying to realize a camera having both the function proposed in the aforementioned US Pat. No. 4,864,332 and the function proposed in the aforementioned US Pat. No. 4,878,075, there are the following problems.

In other words, the read output of the magnetic head increases in proportion to the speed of the film. Therefore, if the film feed speed is slowed down for some reason, such as a decrease in the power supply voltage of the camera or an increase in the film feed load, the data is written on the film. In the case of reading the embedded magnetic information, the read output of the magnetic head is small or unstable. For this reason, for example, unexposed frames cannot be detected (beginning), and some frames will be double-exposed, or the ISO information of the film will be incorrectly input, and an appropriate exposure will not be obtained.
There was a risk that the camera would malfunction.

(Object of the Invention) The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a camera capable of using a film from a magnetic storage unit of a film and a control device of the camera.

(Features of the Invention) In order to achieve the above object, the present invention relates to a camera capable of using a film with a magnetic storage unit, comprising: a magnetic information reading unit for reading information from a magnetic storage unit of the film; Determining means for determining the state of the information, and determining means for determining whether or not to perform an operation involving reading of information from the magnetic storage portion of the film by the magnetic information reading means according to the determination result of the determining means. A camera.

According to another aspect of the present invention, there is provided a camera control device capable of using a film with a magnetic storage unit, comprising: a magnetic information reading unit that reads information from a magnetic storage unit of the film; Determining means for determining the state of the camera, and determining means for determining whether or not to cause the camera to perform an operation involving reading of information from the magnetic storage unit of the film by the magnetic information reading means according to the determination result of the determining means. And a camera control device having the following.

(Embodiment of the Invention) FIGS. 1 to 3 show a first embodiment of the present invention.

FIG. 3 shows a film feeding speed mechanism. Reference numeral 1 denotes a film provided with a magnetic storage unit, which is fed in a direction indicated by an arrow A or in a direction opposite thereto by a known mechanism using a motor or the like. 2
Is a roller member, which is mounted on a camera body (not shown) so that the roller portion 2a comes into contact with the film 1 and rotates in the direction of arrow B when the film 1 is fed in the direction of arrow A. 3
Is a pulse board fixed to the fixed portion 2b of the roller member 2 and rotated integrally with the roller member 2, and includes a conductive portion 3a and a non-conductive portion 3b.
And Reference numerals 4 and 5 denote contact pieces attached to the camera body (not shown). The contact pieces 4 and 5 are conducted by the conduction portion 3a of the pulse plate 3, and the number of rotations of the pulse plate 3 for a predetermined time is measured by the contact pieces 4 and , The feeding speed of the film is detected by a circuit described later. Reference numeral 6 denotes a magnetic head which is attached to a camera body (not shown) and which comes into pressure contact with the magnetic storage portion of the film 1 to read out previously written information or write new information.

In addition, as a method of detecting the film feeding speed, various other methods such as a method of reading the perforation of the film by using a photo interrupter and the like can be considered.

FIG. 1 is a circuit block diagram of a camera provided with a film feed speed detecting mechanism as described above. In FIG. 1, reference numeral 16 denotes a microcomputer or the like,
A control circuit for various camera controls, a film feed drive circuit 17 for driving a film feed motor (not shown), and an AF / AE control circuit 18 for controlling focusing of a photographing lens and operation of an exposure control shutter. , 19 are switches which are turned on by the first stroke of the release button. When this switch is turned on, the release of the camera is started. Reference numeral 20 denotes a cartridge loading switch that is turned on when a film cartridge (not shown) containing the film 1 is loaded into the camera.
Is a back cover switch that is turned on when the back cover is closed, these switches 20 and 21 are connected in series, and when both switches are turned on, a signal to that effect enters the control circuit 16, and the control circuit 16 When this signal is input, the cueing operation of the film 1 to the first frame (the empty film feeding operation) is started via the film feeding drive circuit 17 and the film feeding motor.

Reference numeral 22 denotes a magnetic head drive circuit that controls the write operation and read operation of the magnetic head 6, and 23 denotes a warning display circuit that has display means using LEDs, sounds, liquid crystal displays, and the like, and drives them by a signal from the control circuit 16. is there.

Next, the operation of the control circuit 16 will be described with reference to the flowchart of FIG.

"Step 101" When it is detected that the film cartridge is loaded in the camera and the cartridge loading switch 20 is turned on, and that the back cover is closed and the back cover switch 21 is turned on, the process proceeds to step 102.

"Step 102" Winding of the film is started via the film feed driving circuit 17 and the film driving motor (not shown) so that the first frame of the film 1 comes to the aperture position of the camera.

"Step 103" During the film feeding, the pulse plate 3,
The film feeding speed ν at this time is detected from the pulse signals generated by the contact pieces 4 and 5.

Stably compared with the readable limit velocity v ₁ information in "Step 104" The above film feeding speed v and the magnetic head 6, if a relationship of "v ≧ v _1", the flow proceeds to step 107, If the relation “v <v ₁ ” is satisfied, the process proceeds to step 105.

[Step 105] In order to prevent the camera from malfunctioning by reading the film information erroneously, the warning display circuit 23 is driven to warn the user that the normal reading of the film information is impossible.

[Step 106] A series of operations of the camera are stopped.

As described above, when the relation “v ≧ v ₁ ” is satisfied, the operation proceeds to step 107.

[Step 107] The magnetic head drive circuit 22 is driven to read out the film information, for example, the ISO sensitivity, the number of film frames, the exposed information, etc., stored in advance in the magnetic storage unit of the film 1 by the magnetic head 6. Is stored.

"Step 108" It is determined whether or not the first frame has arrived at the aperture position of the camera. If not, the process returns to step 102, and if so, the process proceeds to step 109.

"Step 109" It is determined whether or not the camera has been released based on the state of the switch 19. If the switch is ON, the process proceeds to step 110.

[Step 110] The AF / AE control circuit 18 is driven to perform a photographing operation such as an exposure operation by focusing a photographing lens and opening and closing a shutter suitable for the ISO sensitivity read out in Step 107.

"Step 111" It is determined whether or not there is a remaining frame in the film 1, and if not, the process proceeds to step 112.
Proceed to 15.

[Step 112] Rewinding of the film 1 is started via the film feed drive circuit 17 and a film drive motor (not shown).

"Step 113" It is determined whether or not the rewinding of the film 1 to the film cartridge has been completed.

[Step 114] A series of operations of the camera are stopped.

If there are remaining frames on the film 1, the process proceeds to step 115 as described above.

"Step 115" Winding of one frame of the film 1 is started via the film feed drive circuit 17 and a film drive motor (not shown).

[Step 116] The pulse plate 3, 3
The film feed speed v at this time is detected from the pulse signals generated by the contact pieces 4 and 5.

"Step 117" The above is compared with the film feeding speed v and stably readable limit velocity information v ₁ by the magnetic head 6, "v <v _1" step 105 already described in the case where the relationship of Returning to step 118, if there is a relationship of “v ≧ v ₁ ”, the process proceeds to step 118.

[Step 118] The magnetic head drive circuit 22 is driven to write (or read information as necessary) shutter time, exposed information, and the like to the magnetic storage unit of the film 1 by the magnetic head 6.

"Step 119" It is determined whether or not the next frame to be photographed has reached the aperture position of the camera. If not, the process returns to step 115.

FIG. 4 is a flowchart showing the operation in the second embodiment of the present invention. The circuit configuration is the same as that in FIG. 1, and the difference is a part of the operation of the control circuit 16.

"Step 201" The process proceeds to step 202 by detecting that the film cartridge is loaded in the camera and the cartridge loading switch 20 is turned on, and that the back cover is closed and the back cover switch 21 is turned on.

[Step 202] Winding of the film is started via the film feed drive circuit 17 and a film driving motor (not shown) so that the first frame of the film 1 comes to the aperture position of the camera.

"Step 203" During the film feeding, the pulse plate 3,
The film feed speed v at this time is detected from the pulse signals generated by the contact pieces 4 and 5.

Stably compared with the readable limit velocity v ₁ information in "Step 204" The above film feeding speed v and the magnetic head 6, if a relationship of "v ≧ v _1", the flow proceeds to step 208, When the relation “v <v ₁ ” is satisfied, the process proceeds to step 205.

"Step 205" It is determined whether or not the first frame has arrived at the aperture position of the camera. If not, the process returns to step 202, and if so, the process proceeds to step 206.

[Step 206] In order to prevent the camera from malfunctioning by reading the film information erroneously, the warning display circuit 23 is driven to warn the user that the reading of the film information is impossible.

"Step 207" The film information is set in the camera as a predetermined value.

Here, the predetermined value is a common value, that is, IS
This is a value such as "ISO = 100" in terms of O sensitivity, "negative" film in terms of film type, and "24 sheets" or "36 sheets" in film frames.

As described above, if the relation “v ≧ v ₁ ” is satisfied, the operation proceeds to step 208.

[Step 208] The magnetic head drive circuit 22 is driven to read out the film information, for example, the ISO sensitivity, the number of film frames, the exposed information, etc., stored in advance in the magnetic storage unit of the film 1 by the magnetic head 6. Is stored.

"Step 209" It is determined whether or not the first frame has arrived at the aperture position of the camera. If not, the process returns to step 102, and if so, the process proceeds to step 210.

[Step 210] It is determined whether or not the camera has been released based on the state of the switch 19. If the switch has been turned on, the process proceeds to Step 211.

[Step 211] The AF / AE control circuit 18 is driven to perform a photographing operation such as an exposure operation by focusing a photographing lens or opening and closing a shutter suitable for the ISO sensitivity read in step 107.

"Step 212" It is determined whether or not there is a remaining frame in the film 1 based on the film information read in step 208 or the regular film information set in step 207, and the like.
If not, proceed to step 213; otherwise, proceed to step 216.

[Step 213] Rewinding of the film 1 is started via the film feed drive circuit 17 and a film drive motor (not shown).

"Step 214" It is determined whether or not the rewinding of the film 1 into the film cartridge has been completed.

[Step 215] A series of operations of the camera are stopped.

If there are remaining frames on the film 1, the process proceeds to step 216 as described above.

"Step 216" Winding of one frame of the film 1 is started via the film feed drive circuit 17 and a film drive motor (not shown).

"Step 217" During the above-mentioned film feeding, the pulse plate 3,
The film feed speed v at this time is detected from the pulse signals generated by the contact pieces 4 and 5.

Stably compared with the readable limit velocity v ₁ information in "Step 218" The above film feeding speed v and the magnetic head 6, if a relationship of "v <v _1", the flow proceeds to step 219, If the relation “v ≧ v ₁ ” is satisfied, the process proceeds to step 220.

"Step 219" It is determined whether or not the next frame to be photographed has reached the aperture position of the camera.
Return to

[Step 220] The magnetic head drive circuit 22 is driven to write (or read information as necessary) shutter time, exposed information, and the like to the magnetic storage unit of the film 1 by the magnetic head 6.

"Step 221" It is determined whether or not the next frame to be photographed has reached the aperture position of the camera. If not, the process returns to step 216.

FIG. 5 is a circuit block diagram of a camera showing a third embodiment of the present invention, and the same parts as those in FIG. 1 are denoted by the same reference numerals.

In FIG. 5, 24 is a film information manual setting unit, 25 is a changeover switch for turning on and off by a signal from the control circuit 16 and inputting information from the film information manual setting circuit to the control circuit 24 when turned on, and 26 is a micro switch. It is a control circuit which is constituted by a computer or the like and controls various operations of the camera.

The operation of the control circuit 26 will be described with reference to the flowchart shown in FIG.

"Step 301" The process proceeds to step 302 by detecting that the film cartridge is loaded in the camera and the cartridge loading switch 20 is turned on, and that the back cover is closed and the back cover switch 21 is turned on.

"Step 302" Winding of the film is started via the film feed drive circuit 17 and the film driving motor (not shown) so that the first frame of the film 1 comes to the aperture position of the camera.

"Step 303" During the film feeding, the pulse plate 3,
The film feed speed v at this time is detected from the pulse signals generated by the contact pieces 4 and 5.

Stably compared with the readable limit velocity v ₁ information in "Step 304" The above film feeding speed v and the magnetic head 6, if a relationship of "v <v _1", the flow proceeds to step 305, If the relation of “v ≧ v ₁ ” is satisfied, the process proceeds to step 308.

"Step 305" It is determined whether or not the first frame has arrived at the aperture position of the camera. If not, the process returns to step 302, and if so, the process proceeds to step 306.

[Step 306] In order to prevent the camera from malfunctioning by reading the film information erroneously, the warning display circuit 23 is driven to warn the user that the reading of the film information is impossible.

"Step 307" The changeover switch 25 is turned on, and the film information from the film information setting section 24 is input. A method for manually setting the film information, for example, the ISO sensitivity and the number of film frames, will be described later.

As described above, in the case of “v ≧ v ₁ ”, the operation proceeds to step 308.

[Step 308] The magnetic head drive circuit 22 is driven to read out the film information, for example, the ISO sensitivity, the number of film frames, the exposed information, etc., stored in advance in the magnetic storage unit of the film 1 by the magnetic head 6, and Is stored.

"Step 309" It is determined whether or not the first frame has arrived at the aperture position of the camera. If not, the process returns to step 302, and if so, the process proceeds to step 310.

"Step 310" It is determined whether or not the camera has been released based on the state of the switch 19. If the switch has been turned on, the process proceeds to step 311.

[Step 311] The AF / AE control circuit 18 is driven to perform a photographing operation such as an exposure operation by focusing a photographing lens or opening and closing a shutter suitable for the ISO sensitivity read in step 107.

[Step 312] Based on the film information read in step 208 or the film information manually set in step 207, it is determined whether or not there is a remaining frame in the film 1,
If not, proceed to step 313; otherwise, proceed to step 316.

[Step 313] Rewinding of the film 1 is started via the film feed drive circuit 17 and a film drive motor (not shown).

"Step 314" It is determined whether or not the rewinding of the film 1 to the film cartridge has been completed.

[Step 315] A series of operations of the camera are stopped.

If there are remaining frames on the film 1, the process proceeds to step 316 as described above.

"Step 316" Winding of one frame of the film 1 is started via the film feed drive circuit 17 and a film drive motor (not shown).

"Step 317" Pulse plate 3,
The film feed speed v at this time is detected from the pulse signals generated by the contact pieces 4 and 5.

Stably compared with the readable limit velocity v ₁ information in "Step 318" The above film feeding speed v and the magnetic head 6, if a relationship of "v <v _1", the flow proceeds to step 319, If the relation “v ≧ v ₁ ” is satisfied, the process proceeds to step 320.

[Step 319] It is determined whether or not the next frame to be photographed has reached the aperture position of the camera.
Return to

[Step 320] The magnetic head driving circuit 22 is driven to write (or read information as necessary) shutter time, exposed information, and the like to the magnetic storage unit of the film 1 by the magnetic head 6.

"Step 321" It is determined whether or not the next frame to be photographed has reached the aperture position of the camera. If not, the process returns to step 316.

Here, the manual setting method will be described by taking an example of inputting the ISO sensitivity.

7 is a perspective view of the camera, 10 is a camera body, 11 is a photographing lens, 12 is a finder, 13 is a release button, 14 is a manual setting knob (corresponding to the film information manual setting section in FIG. 5), 15 Is a display unit.

8 and 9 are enlarged views of the display unit 15 and the manual setting knob 14. FIG.

The manual setting knob 14 can be moved in the direction of arrow C (see FIG. 8), and can be stopped at some positions by clicking or the like.

Also, a switch (not shown) turns on in conjunction with the movement,
Although the signal to the control circuit 26 of the camera is input, it is only when there is a relationship of as already mentioned "v <v _1", "v ≧ v _1" when there of the relationship changeover switch 25 But
Since it is OFF, it is not input to the control circuit 26. Therefore, in the case of the relation of “v <v ₁ ”, the ISO sensitivity is displayed by a liquid crystal display or the like as shown in FIG. 8, and the index 14a of the manual setting knob 14 is set to the index of the film using the same. By adjusting the ISO sensitivity, a switch (not shown) is turned on, and the information is input to the control circuit 26.

When the display section 15 has a relation of “v ≧ v ₁ ”, the liquid crystal display is not performed.

According to each of the above embodiments, the film feeding speed is detected, and when the speed is slower than a predetermined value and reading of the film information cannot be performed normally by the magnetic head, 1) the operation of the camera is prohibited. Give a warning.

2) A warning is issued and the film information is set as a normal value, and this is used as film information for controlling the camera.

3) A warning is issued and information set manually is set as film information for controlling the camera.

Thus, there is an effect that the malfunction of the camera due to the erroneous reading of the film information is eliminated.

(Effects of the Invention) As described above, according to the present invention, it is possible to use a film with a magnetic storage unit that prevents information from being read out from the magnetic storage unit of the film from being performed properly and malfunctioning. A camera and a control device for the camera can be provided.

[Brief description of the drawings]

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 a control circuit shown in FIG. 1, and FIG. 3 is a film in the first embodiment of the present invention. FIG. 4 is a perspective view showing an example of a feeding mechanism. FIG. 4 is a flowchart showing the operation of the second embodiment of the present invention.
FIG. 7 is a circuit block diagram of a camera showing a third embodiment of the present invention. FIG. 6 is a flowchart showing the operation of a control circuit shown in FIG. 5. FIG. 7 is a camera showing a third embodiment of the present invention. FIGS. 8 and 9 are enlarged views of the manual setting knob and the display unit shown in FIG. 1 ... Film with magnetic storage unit, 3 ... Pulse plate, 4,5 ...
… Contact piece, 6… Magnetic head, 14… Manual setting knob, 15
... Display unit, 16 control circuit, 22 magnetic head drive circuit, 23 warning display circuit, 24 film information manual setting unit, 25 switch, 26 control circuit.

Claims (2)

(57) [Claims] 1. A camera that can use a film with a magnetic storage unit, a magnetic information reading unit that reads information from a magnetic storage unit of the film, a determination unit that determines a state of a film feed speed, and the determination unit. A determination unit for determining whether or not to perform an operation involving reading of information from the magnetic storage unit of the film by the magnetic information reading unit in accordance with the determination result. 2. A control device for a camera capable of using a film with a magnetic storage unit, comprising: a magnetic information reading unit that reads information from a magnetic storage unit of the film; a determination unit that determines a state of a film feeding speed; Determining means for determining whether or not to cause the camera to perform an operation involving reading of information from the magnetic storage section of the film by the magnetic information reading means in accordance with the result of the determination by the determining means. Control device.