JPH05142679A - Camera provided with information reproducing device - Google Patents

Abstract

PURPOSE:To improve the reliability of information reproduced by an information reproducing head while cost is kept low and the miniaturization of a device is maintained. CONSTITUTION:This camera is equipped with a 1st motor 12 for feeding film where information recording area is provided, which is not a noise producing source, and an information reproducing head 16 for reproducing information previously recorded on the information recording area while the film is fed by the motor 12. It is also provided with a 2nd motor 14 which is provided separately from the motor 12 and which is the noise producing source, and an inhibition means (motor driving control means) 11 for inhibiting the actuation of the motor 14 while the information is reproduced by the head 16.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera having an information reproducing apparatus configured to reproduce film information or the like previously recorded in an information recording area of a film as the film is fed.

[0002]

2. Description of the Related Art In areas other than the video recording area of film,
For example, an information recording area including a magnetic layer is provided, and film information such as ISO sensitivity and the number of frames is previously recorded in this information recording area, and this film information is provided on the camera side with the film feeding. The structure for reproducing is well known (see, for example, US Pat. No. 4,878,075). As such an information reproducing apparatus, one having a magnetic head provided at a position facing the magnetic information recording area and a pad provided at a position facing the magnetic head across the magnetic recording area of the film. is there. When reproducing magnetic information with this information reproducing device, the pad is brought into contact with the magnetic head,
The magnetic information is reproduced by the magnetic head while the film is fed by sandwiching the film by the pad and the magnetic head. The state of the pad during this reproduction is called the touch state.
When the magnetic information is not reproduced, the pad is retracted from the magnetic head and the magnetic head and the film are brought into a non-contact state. This state is called the detached state. The movement of the pad is usually performed by a motor or the like provided separately from the film feeding motor.

In a camera having such an information reproducing apparatus, since a magnetic head reproduces information while feeding a film, a motor with less noise such as a so-called coreless motor is used as a film feeding motor. When using or using a motor in which generation of noise is unavoidable, magnetic shielding is performed using a magnetic shield plate to prevent the influence of noise when reproducing magnetic information.

In a camera capable of reproducing magnetic information as described above, a camera body is used for charging a shutter or driving a zoom lens barrel, in addition to a motor for film feeding (winding and rewinding). It is known that a dedicated motor is provided inside.

When a plurality of motors such as a charging motor and a zoom driving motor are provided in the camera in addition to the film feeding motor, the motors that can be driven simultaneously should be at the same time as much as possible in order to shorten the time required for the photographing sequence. The entire camera is controlled to drive.

[0006]

Assuming that shutter charging is performed in parallel with reproduction of magnetic information in order to shorten the sequence time of the camera, electromagnetic noise generated from the shutter charging motor will be considered. It is necessary to avoid the influence on the information reproduction by. Therefore, it is conceivable to use a coreless motor in which the direction of noise generation is determined by the rotation angle as the shutter charging motor, use the motor only at the rotation angle with the least noise, or use the magnetic shield plate. However, the coreless motor itself is expensive, and the burden on the cost of the entire camera is large, and the use of the magnetic shielding plate may increase the cost and the size of the camera, which is not preferable.

In order to solve such a problem, the motor is arranged so that the distance between the information reproducing device and the shutter charging motor is as large as possible (information reproduction in relation to the information recording area of the film). Since the position of the device is determined to some extent, it is possible to have a relatively large degree of freedom of arrangement on the side of the motor.) Is difficult to place, especially
This is a very difficult subject under the demand for miniaturization of cameras.

An object of the present invention is to provide a camera having an information reproducing apparatus capable of improving the reliability of information reproduced by an information reproducing head while maintaining a low cost and miniaturization.

[0009]

When the invention according to claim 1 is described with reference to FIG. 1 which is a claim correspondence diagram, as shown in FIG. 1A, a film provided with an information recording area is supplied. The first motor 12 for sending, and this first motor 1
The present invention is applied to a camera provided with an information reproducing head 16 which reproduces the information previously recorded in the information recording area while feeding the film according to 2. Then, the second motor 14 provided separately from the first motor 12 and the operation of the second motor 14 are prohibited while the information reproducing head 16 is reproducing information, and the operation of the first motor 12 is prohibited. Is provided with a motor drive control means 11 for permitting, thereby achieving the above-mentioned object. According to a second aspect of the present invention, a first motor 22 that sends out a film provided with an information recording area from a film cartridge, and a second motor that is rotated by the first motor 22 to wind the film sent out from the film cartridge around a spool. It is applied to a camera provided with a motor 24 and an information reproducing head 16 for reproducing information previously recorded in an information recording area while feeding a film. And
After the film reaches the spool, the first motor 22 is stopped and the motor drive control means 21A for controlling the motor to feed the film only by the second motor 24 and the first motor 22 The information reproducing head 16 is prohibited from reproducing information during feeding, and the information reproducing head 16 reproduces information during the operation of winding the film on the spool by the second motor 24. To achieve.

[0010]

According to the first aspect of the present invention, when the information reproducing head 16 reproduces information while feeding the film by the first motor 12, the operation of the second motor 14 is prohibited. Therefore, there is no possibility that noise generated from the second motor 14 adversely affects the information reproducing operation. Claim 2
In the invention, when the delivery motor 22 delivers the film to the spool, the delivery motor 22 is stopped. Then, while the spool is driven to rotate by the second motor 24 to wind the film around the spool, the reproducing head 16 reproduces the information. Therefore, there is no possibility that noise from the delivery motor 22 will adversely affect the information reproducing operation.

Incidentally, in the section of means and action for solving the above problems for explaining the constitution of the present invention, the reference numerals of the embodiments are used to make the present invention easy to understand. It is not limited to.

[0012]

【Example】

-First Example- A first example will be described with reference to FIGS. In FIG. 2, reference numeral 11 denotes a control circuit including a CPU, ROM, RAM, and other peripheral circuits, a drive circuit 13 for a film feeding motor (first motor) 12, a motor for charging a shutter and an aperture. The drive circuit 15 of the (second motor) 14 is connected. Here, it is preferable to use a motor that does not generate much noise as the film feeding motor 12, but when using the motor 12 that cannot suppress the generation of noise, a magnetic shield plate is provided to prevent the generation of noise. Shall be prevented. Further, as the charging motor 14, a motor that cannot suppress the generation of noise is used, and no magnetic shield plate is provided.

Reference numeral 16 is a magnetic head, which magnetically stores various kinds of photographing information (film sensitivity information, information indicating an unexposed frame when a film taken up to an intermediate shooting frame is taken out) on a shooting recording medium such as a film. The magnetic head 16 is used for recording various information on the recording medium or reproducing the various magnetic information recorded on the recording medium.
The drive is controlled by 7. Note that a pad facing the magnetic head 16 is provided, and the pad is driven into a touch state during reproduction and recording as in the conventional case. Further, in FIG. 2, reference numeral 18 denotes a back lid opening / closing switch that is turned on / off according to the opened / closed state of the back lid, 19 is a half-push switch that is turned on in conjunction with a half-push operation of the release button, 2
Reference numeral 0 is a full-push switch that is turned on in synchronization with the full-push operation of the release button.

FIG. 3 shows a control procedure of the camera thus constructed. When it is detected in step S1 that the back cover opening / closing switch 18 has closed the back cover, the process proceeds to step S2. In step S2, the film feeding motor 12 is activated through the drive circuit 13 to feed the film. Further, in step S3, the magnetic head 16 is caused to perform the information reproducing operation through the drive circuit 17, and various magnetic recording information recorded in advance in the magnetic recording area of the film is read out. Next, in step S4, it is determined whether or not the reproduction operation is completed. When it is determined that the reproduction is completed, the process proceeds to step S5.

Next, in step S5, the shutter and aperture charging motor 14 is driven to charge the shutter and aperture, and in step S6 it is determined whether the operation is completed. When the charging operation is completed, the process proceeds from step S6 to step S7, and it is determined whether the initial feeding when the film is loaded is completed. When it is determined in step S7 that the initial feeding of the film has been completed, this procedure ends.
After that, distance measurement and photometry are performed in response to the half-push switch 19 being turned on by a procedure (not shown), and when the full-push switch 20 is turned on, the shutter is operated to perform photographing. After the photographing is finished, the film is wound by the film feeding motor 12.

FIG. 4 shows an operation sequence for driving the two motors with a time difference as described above. FIG. 4A shows that the film feeding motor 12 is turned on.
A waveform diagram showing the off state, FIG. 4B shows the magnetic head 16
4C is a waveform diagram showing the presence or absence of the reproduction operation by FIG. 4, and FIG. 4C is a waveform diagram showing the ON / OFF state of the charging motor 14. Time points t1 to t2 are operation periods of the film feeding motor 12 when the film is loaded, time points t3 to t4 are periods during which magnetic information is reproduced by the magnetic head 16 while feeding the film, and time points t4 to t5 are the charging motor 14. Shows the operating period of. As can be seen from FIGS. 4A to 4C, while the magnetic information is being reproduced by the magnetic head 16, the operation of the charging motor 14 is prohibited so that the charging motor 14 generates the magnetic information at the time of reproducing the magnetic information. The reproduced noise is not affected. Then, after reproducing the information, the charging motor 14 is activated to charge the shutter and the diaphragm.

Second Embodiment In this embodiment, when the film shaft of the film cartridge is rotationally driven by the camera when the film cartridge is loaded in the camera, the film is sent out from the inside of the cartridge, and the spool shaft is rotated by the motor. Then, it is applied to a camera in which a film is wound around a spool shaft. Even when the film is taken out halfway, the film is completely stored in the cartridge chamber.

FIG. 5 is a block diagram of a control system according to the second embodiment, and FIG. 6 is a flow chart showing a control procedure. The same parts as those in FIGS. Will be explained. The control circuit 21 including a CPU, a ROM and the like includes a drive circuit 23 for a film delivery motor (first motor) 22 and a spool drive motor 24 for rotating the spool in the spool chamber in synchronization with the delivery motor 22. Drive circuit 25 is connected. Here, it is preferable to use a motor that generates less noise as the spool driving motor 24, but if a motor that cannot suppress noise generation is used, a magnetic shield plate is provided to prevent noise generation. I shall. Further, as the feeding motor 22, a motor that cannot suppress the generation of noise is used, and no magnetic shield plate is provided. Further, reference numeral 26 is a cartridge switch for detecting opening / closing of the cartridge lid for opening / closing the film cartridge chamber.

FIG. 6 shows a control procedure of the camera thus constructed. In FIG. 6, step S11
When it is detected by the cartridge switch 26 that the cartridge lid is closed, the process proceeds to step S12, and the feed motor 22 is driven to feed the film from the cartridge. Next, in step S13, when the photo sensor arranged in the film feeding path detects that the leading end of the film has been fed to the spool shaft, in step S14, the feeding motor 22 is stopped and the spool rotation motor 24 is turned on. To drive. Although the film feeding speed changes with the activation of the spool rotation motor 24, the feeding motor 22 may be stopped by detecting the change in the film feeding speed. Then, step S
After waiting for a predetermined time at 15, the process proceeds to step S16, and reproduction of magnetic information by the magnetic head 16 is started. When the completion of reproduction is detected in step S17, the process proceeds to step S18. When it is determined in step S18 that the initial feeding of the film is completed, this procedure ends. The subsequent photographing procedure is similar to that of the first embodiment.

FIG. 7 shows a sequence of the film initial feeding operation executed in such a procedure. 7A is a waveform diagram showing the ON / OFF state of the film feeding motor 22, FIG. 7B is a waveform diagram showing the ON / OFF state of the spool rotation motor 24, and FIG. 7C. FIG. 6 is a waveform diagram showing whether or not a reproducing operation is performed by the magnetic head 16. Time points t11 to t12 are the operation period of the film feeding motor 22 when the film is loaded, time points t12 to t13 are the operation period of the spool rotation motor 24, and the time points t14 to t.
Reference numeral 15 indicates a period during which magnetic information is reproduced by the magnetic head 16 while the film is being fed.

As can be seen from FIGS. 7 (a) to 7 (c), reproduction of magnetic information by the magnetic head 16 is prohibited during operation of the sending motor 22 which generates noise, and after the sending motor 22 is stopped. , The magnetic head 16 during film feeding by the spool rotation motor 24 that does not generate noise
The magnetic information on the film is reproduced by the
The noise generated from 2 does not affect the reproducing operation. Note that, as shown by the broken line in FIG.
The spool rotation motor 24 may be activated in synchronization with the film feeding motor 22 starting the film feeding. Although not shown, the shutter and diaphragm are charged by the charging motor 14 after information reproduction.

Although the case where the magnetically recorded information is reproduced by the magnetic head has been described above, the present invention can be applied to the case where various information recorded on the film is reproduced by a method other than the magnetic method. For example, it is possible to reproduce optically recorded information or so-called magneto-optically recorded information with a corresponding head.

[0023]

As described in detail above, according to the present invention, when the information recorded on the recording medium is reproduced by the head, the driving of the motor which is a noise source is prohibited,
On the contrary, since the information reproducing operation is prohibited while the motor, which is a noise source, is driven, the motor driven at the time of reproducing information should be a motor with less noise generation, or a means for shielding noise should be provided. It is possible to avoid adverse effects on the information reproduction due to the noise generated from the motor, without having to separate it from the reproducing head, which contributes to cost reduction and downsizing of the camera.

[Brief description of drawings]

[Fig. 1] Claim correspondence diagram

FIG. 2 is a block diagram showing a control system of the first embodiment.

FIG. 3 is a flowchart showing the procedure of the first embodiment.

FIG. 4 is a waveform diagram showing operation timing and information reproduction timing of the motor of the first embodiment.

FIG. 5 is a block diagram showing a control system of a second embodiment.

FIG. 6 is a flowchart showing the procedure of the second embodiment.

FIG. 7 is a waveform diagram showing the operation timing and information reproduction timing of the motor of the second embodiment.

[Explanation of symbols]

11, 21 Control Circuit 12 Film Feeding Motor 14 Charging Motor 16 Magnetic Head 18 Back Lid Opening / Closing Switch 22 Feeding Motor 24 Spool Rotating Motor 26 Cartridge Lid Opening / Closing Switch

Claims (4)

[Claims] 1. A first motor for feeding a film having an information recording area, and information for reproducing information prerecorded in the information recording area while feeding the film by the first motor. In a camera provided with a reproducing head, a second motor provided separately from the first motor, and prohibiting the operation of the second motor during reproduction of information by the information reproducing head, A camera having an information reproducing apparatus, comprising: a motor drive control means for permitting operation of the first motor. 2. A first motor for feeding a film provided with an information recording area from a film cartridge, and a second motor rotated by the first motor for winding the film fed from the film cartridge on a spool. A camera having an information reproducing head for reproducing the information previously recorded in the information recording area while feeding the film, the second motor being stopped by stopping the first motor after the film reaches the spool. A motor drive control means for controlling the motor so that the film is fed only by the motor,
Control means for prohibiting reproduction of information by the information reproducing head while the film is being sent out by the motor, and causing the information reproducing head to reproduce information during the operation of winding the film around the spool by the second motor. A camera having an information reproducing device. 3. A camera having an information reproducing apparatus according to claim 2, wherein the second motor is a motor with less noise generation. 4. A camera having an information reproducing apparatus according to claim 2, further comprising shielding means for shielding noise generated from the second motor.