JPH05134307A - Camera with information recorder - Google Patents

Abstract

PURPOSE:To obtain a camera provided with an information recorder which can be reused thereafter without strictly positioning between film and the information recorder as for the camera having such a form that photographing information is written on the film on which film information is previously written. CONSTITUTION:In the camera provided with a feeding means (c) which feeds the film (a) obtained by previously writing the film information in an information recording area (b) and an information recording means (d) which records the photographing information at least at one part of the area (b), an erasing means (e) which erases the film information written in the area (b) and a control means (f) which allows the recording means (d) to write the photographing information at least at one part of the area (b) after the film (a) is fed by the feeding means (c) after the finish of an exposure action and the film information previously written in the area (b) is erased by the erasing means (e) are provided.

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 recording device for recording photographing information in an information recording area provided on a film.

[0002]

2. Description of the Related Art A camera having a function of providing a recording area for recording information on a part of a film, writing information relating to photographing in the recording area, and reproducing the information when the film is fed is well known ( For example, U.S. Patent Publication No. 4,878,07
No. 5)

The one disclosed in US Pat. No. 4,878,075 relates to a camera device having a so-called prewinding mechanism. The film loaded in this camera is provided with an exposed information recording area at a portion corresponding to each frame, and at the time of exposure, information indicating exposed is written in the display area. Then, when the film is rewound and then shot again with this film, the information in the display area is reproduced in the prewind mode to search for the area in which the information indicating that the film has been exposed is written, and from this point, only one frame is recorded. The film is rewound to search for unexposed frames.

On the other hand, it is conceivable that the film sensitivity information previously written on the film is erased at the time of exposure and the unexposed frame is searched for by searching the area where the information is erased when the film is reused. Be done.

Writing information regarding photographing is equivalent to erasing film sensitivity information and the like. That is,
When film sensitivity information and the like are recorded in advance in the information recording area of the film, the information related to shooting is recorded (overwritten) in this information recording area, so that information related to shooting is recorded when the film is reused. Detecting the area where the film sensitivity information is erased is exactly the same as detecting the area where the film speed information is erased.

[0006] The point to be noted when reusing a film used halfway in this way is that the film used in that camera is not always reloaded into the camera used for halfway shooting, and therefore, When a relative displacement between the information recording device such as a magnetic head and the film occurs depending on the model, the area in which the information is written or erased cannot always be detected accurately. Therefore, in order to share the same film among a plurality of models, it is necessary to strictly position the information recording device and the film.

[0007]

However, in order to strictly position the information recording device and the film,
Since the mechanism of the film running system and the mount system of the information recording apparatus becomes sturdy, precise, and complicated, and it may not be practical in terms of cost, positioning is not always strictly performed in all cameras. Therefore, when a film used in a camera with a loose positioning accuracy is reloaded in a camera of a different model, and the information writing section or the information erasing section is in a position deviating from the original standard, the information reproducing apparatus of this camera However, it may not be possible to reliably detect the information writing section and the like, and search for unexposed frames may become impossible. To prevent this, in a camera that cannot reliably erase or record information at a predetermined recording position, once the film is loaded into the camera, it is considered that the film is already exposed even if it is halfway exposed. It was set so that As a result, there is a problem that even if only a few films have been shot, it is difficult to use the films thereafter.

An object of the present invention is to enable reuse in a camera of a type in which shooting information is written on a film in which film information is written in advance, without strict positioning of the film and the information recording device. Another object of the present invention is to provide a camera having a portable information recording device.

[0009]

The present invention will be described with reference to FIG. 1, which is a claim correspondence diagram, and a feeding means c for feeding a film a in which film information is previously written in an information recording area b. It is applied to a camera provided with an information recording means d for recording photographing information in at least a part of the information recording area b. And, the above-mentioned purpose is to erase means e for erasing the film information written in the information recording area b.
And a control means f for feeding the film a by the feeding means c after the end of the exposure operation, erasing the film information by the erasing means e, and then recording the photographing information by the information recording means c. It is achieved by providing.

[0010]

The control means f controls the feeding means c after the exposure operation is completed.
The film a is fed by the erasing means to erase the film information previously written in the information recording area b by the erasing means e, and then the photographing information is recorded in at least a part of the information recording area b by the information recording means c. ..

[0011]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 2 is a block diagram showing a circuit configuration of a first embodiment of a camera having an information recording device according to the present invention.

First, the film loaded in the camera of this embodiment will be described. A film 20 as shown in FIG. 3 is loaded in the camera of this embodiment. This film 2
Reference numeral 0 has a plurality of video recording areas 21 in which video information is recorded by photographing, and a magnetic recording area 22 extending below the video recording areas 21 along the longitudinal direction thereof. In the magnetic recording area 22, for example, the IS of the film 20 is
Film information such as information about O sensitivity (ISO information) 2
3 is recorded in advance. In addition, the magnetic recording area 22
In some of them, shooting information 24 such as shooting conditions such as an exposure value and a shutter speed value is written (details will be described later).

Two perforations 25 are provided on the upper portion of the film 20 at positions corresponding to the front and rear (left and right in FIG. 3) of each video recording area 21. The camera of this embodiment is a camera having a so-called normal winding mechanism in which the film 20 is wound and moved from left to right each time a frame feed / exposure operation is performed.

The film 20 of this embodiment is housed in a cartridge 30 as shown in FIG. 4 (Japanese Patent Application No. 2-1).
89994). The periphery of the upper end surface of the cartridge 30 is divided into four, and "1 (unused)" for displaying the usage state of the film 20 in the cartridge 30 in the three areas.
Display symbols 31a, 31b, 31c of "2 (taken out halfway)" and "3 (photographed)" are provided. Further, the spool 32 provided in the cartridge 30 is
An index 32a is provided at a position facing these three areas, and one of the display symbols 31a to 31c is indicated by the rotation stop position of the spool 32 so that the usage state of the film 20 is displayed in three stages. It is configured.
The rotation position of the spool 32 is provided in the camera,
It is changed by a not-shown fork that engages with the spool 32. However, the rotation preventing mechanism (not shown) prevents the spool 32 from rotating except when the spool 32 is loaded in the camera, thereby preventing a malfunction.

Returning to FIG. 2, reference numeral 1 is a control circuit which incorporates a microcomputer for controlling the entire camera and other peripheral circuits, and is provided with a memory, a judgment circuit, an arithmetic circuit, a timer and the like. Reference numeral 2 is a focus detection device including a photoelectric conversion element and the like, and 3 is a photometric device including an element for TTL photometry. An exposure control circuit 4 includes a shutter mechanism section and a diaphragm mechanism section (not shown).

Reference numeral 5 denotes a perforation detecting section, which comprises a photosensor 6 provided at a position opposite to the perforation 25 of the film 20, and a photoelectric conversion circuit 7 for converting a signal from the photosensor 6 into an electric signal. ing.

Reference numeral 8 is an information recording circuit, 9 is a recording magnetic head drive circuit, and this recording magnetic head drive circuit 9 is
With the film 20 loaded in the camera, the recording magnetic head 10 is brought into contact (touch) with the magnetic recording area 22 of the film 20. The information recording circuit 8 sends a signal for writing the photographing information 24 to the magnetic recording area 22 to the magnetic head 10 when the recording magnetic head 10 comes into contact.

Reference numeral 11 denotes an information erasing element drive circuit, and this information erasing element drive circuit 11 is provided in the camera with a film 20.
The information erasing element 12 is brought into contact with (touched) the magnetic recording area 22 of the film 20 in a state where is loaded, and the film information 23 previously recorded in the magnetic recording area 22 is erased.

Numeral 13 is a winding motor drive circuit. This winding motor drive circuit 13 drives the film winding motor 14 to rotate in response to a command from the control circuit 1 to drive the film 20 loaded in the camera. Wind up. Reference numeral 15 denotes a rewinding motor drive circuit. The rewinding motor drive circuit 15 rotationally drives the film rewinding motor 16 in accordance with a command from the control circuit to rewind the film 20 loaded in the camera. At the same time, the rotational position of the spool 32 is changed.
Reference numeral 18 is a frame number counter for counting the number of frames to be photographed.

SW1 and SW2 are half-push and full-push switches interlocked with the release button of the camera body. The switch SW1 is turned on by the first stroke of the release button, and the switch SW2 is turned on by the second stroke of the release button. To do. SW3 is a switch for instructing to take out the film halfway, and SW4 is a fork encoder for detecting the rotational position of the above-mentioned fork (not shown).

FIG. 5 is a diagram showing the positions of the recording magnetic head and the like in the camera. In FIG. 5, AP is an aperture (opening) of the camera that passes forward in a state where the films 20 face each other. Above this aperture AP, a photo sensor is located at a position facing the perforations 25 of the film 20. 6 is provided. Also,
Below the aperture AP, the recording magnetic head 10 and the information erasing element 12 are provided at positions facing the magnetic recording area 22 of the film 20. More specifically,
The photo sensor 6 and the recording magnetic head 10 are provided on the downstream side in the film winding direction (the direction from left to right in FIG. 5), and the information erasing element 12 is provided on the upstream side in the film winding direction. ..

The information erasing element 12 is a film 20.
It is necessary that the film information 23 recorded in the magnetic recording area 22 has a sufficient width in the width direction. Examples of the information erasing element 12 include an ordinary erasing magnetic head and a simple electromagnet.
Alternatively, a permanent magnet may be used. However, when a permanent magnet is used, if the permanent magnet is brought into contact with the film 20 at any time other than the information erasing operation, the surrounding unnecessary information may be erased. Therefore, the permanent magnet is used only during the erasing operation. Must be brought into contact with the film 20.

Further, as shown in FIG. 6, the recording magnetic head 10 is configured to record the same photographing information 24 in three areas 22a to 22c at intervals in the vertical direction.

Next, the operation of the camera of this embodiment will be described with reference to the flow charts of FIGS. (1) Shooting Sequence When the power switch of the camera (not shown) is turned on, the program shown in FIG. 7 starts. First, step S10
At 1, the half press switch SW1 is awaited for ON determination, and after waiting for the ON determination, the program proceeds to step S102. In step S102, the focus detection device 2 and the photometric device 3 perform distance measurement / photometric operations. Step S1
In 03, the on-determination of the full-press switch SW2 is waited, and after waiting the on-determination, the program proceeds to step S104, and the exposure control circuit 4 executes the exposure operation. The above operation is well known.

In step S105, the control circuit 1 instructs the film winding motor drive circuit 13 to wind the film by the film winding motor 14, and the film winding motor drive circuit 13 is instructed.
Causes the film winding motor 14 to wind the film 20. In step S106, the information erasing element 1
The control circuit 1 instructs the information erasing element driving circuit 11 to erase the film information 23 by the information erasing method 2, and the information erasing element driving circuit 11 brings the information erasing element 12 into contact with the magnetic recording area 22 of the film 20. The film information 23 previously recorded in 22 is erased.

In step S107, a predetermined delay time is given, and in step S108, the recording magnetic head 10 is used.
The control circuit 1 instructs the information recording circuit 8 and the recording magnetic head drive circuit 9 to write the photographing information 24 by the head drive circuit 9 which causes the recording magnetic head 10 to move to the film 20.
The magnetic recording area 8 is brought into contact with the magnetic recording area 22 of the information recording circuit 8.
Write in. The delay time in step S107 is for delaying the writing of the photographing information 24 until the film feeding speed becomes stable in consideration of the rising characteristics of the film winding motor 14.

In step S109, the photosensor 6 waits for the perforation 25 to be detected. If the perforation 25 is detected, the program proceeds to step S110.
Move to. It should be noted that the perforation 25 detected here is the video recording area 2 of which the photographing is completed in FIG.
The perforation 25 is located on the upper left side of 1.

In step S110, the control circuit 1 finishes writing the photographing information 24 by the recording magnetic head 10.
To information recording circuit 8 and recording magnetic head drive circuit 9
The information recording circuit 8 finishes the writing operation of the photographing information 24 by the magnetic head 10, and the head drive circuit 9 retracts the recording magnetic head 10 from the magnetic recording area 22 of the film 20. In step S111, intermittent driving of the film winding motor 14, that is, duty driving is started. This duty driving is to reduce the feeding speed of the film 20 before the film 20 is stopped in consideration of the inertia of the motor 14.

In step S112, the photo sensor 6 is again used.
Waits for perforation 25 to be detected, and if perforation 25 is detected, the program proceeds to step S1
Move to 13. The perforation 25 detected here is the perforation 2 located on the upper right side of the video recording area 21 to be photographed next in FIG.
It is 5.

In step S113, the information erasing element 12
The control circuit 1 instructs the information erasing element drive circuit 11 to end the erasing operation of the film information 23 by the information erasing element drive circuit 11, and the information erasing element drive circuit 11 evacuates the information erasing element 12 from the magnetic recording area 22 of the film 20 to erase the information. The erasing operation of the film information 23 by the element 12 is completed. In step S114, the end of duty driving of the film winding motor 14 is instructed. In step S115, the control circuit 1 instructs the winding motor driving circuit 13 to stop film winding by the film winding motor 14, and the winding motor driving circuit 13 is instructed. Stops the winding operation of the film 20.

Thereafter, in step S116, it is determined based on a signal from the frame number counter 18 whether the film 20 has been wound up to the last frame. If the determination is affirmative, the program shifts to the flow chart shown in FIG. If the determination is negative, the shooting sequence ends.

(2) Film take-out The program shown in FIG. 9 is started after the on-judgment of the film mid-take-out switch SW3. First, in step S201, the control circuit 1 commands the rewinding motor drive circuit 15 to rewind the film by the film rewinding motor 16, and the rewinding motor drive circuit 15 causes the film rewinding motor 16 to rewind the film 20. I do. In step S202, the determination of the rewinding completion of the film 20 by the frame number counter 18 is waited, and when the rewinding completion is determined, the program proceeds to step S203.

In step S203, it is determined whether or not all frames of the currently loaded film 20 have been photographed. If the determination is affirmative, the program proceeds to step S204, and if the determination is negative, the step is determined. S20
Go to 5. Although the determination method is arbitrary, in the present embodiment, when the determination in step S116 in FIG. 8 is affirmative and the program starts, it can be determined that all the frames have been photographed, and the switch SW3 is determined to be on. Thus, when the program starts, it can be determined that all the frames have not been shot.

In step S204, the rotation position of the spool 32 is referred to by the signal from the fork encoder SW4, and the film rewinding motor 16 is rotated to display "3" by the spool index 32a. Instructed by the motor drive circuit 15, the rewind motor drive circuit 15 causes the film rewind motor 16 to rotate the spool 32 by a predetermined angle and displays "3" by the index 32a. Similarly, in step S205, the spool 32 is output by the signal from the fork encoder SW4.
Is referred to, the control circuit 1 instructs the rewinding motor drive circuit 15 to rotate the film rewinding motor 16 and display "2" by the spool index 32a,
The rewinding motor drive circuit 15 rotates the spool 32 by a predetermined angle by the film rewinding motor 16 and displays "2" by the index 32a. After this, the program ends.

FIG. 10 is a time chart showing the above operation. In the figure, (a) shows the film feeding motor 14
Drive waveform, (b) is a drive waveform of the information erasing element 12, (c)
Is a drive waveform of the recording magnetic head 10 and (d) is a detection waveform of the photosensor 6. At the time t ₁ , the film feeding and the information erasing start simultaneously, and the delay time Δt
Information recording starts at a time t _{2 which} is only delayed. At time t ₃ when the perforation 25 is first detected after the film is fed, the information recording is finished, and at the same time, the duty driving of the film winding motor 14 is started. Furthermore, the time t _{4 when the} perforation 25 is detected again
After erasing information, the film winding motor 14
Also stop.

As described above, according to this embodiment, the film 2
Since the recording magnetic head 10 and the information recording element 12 are operated in association with the feeding of 0, as shown in FIG. 3, prior to the writing of the photographing information 24 by the magnetic head 10,
One piece of film information 23 recorded in advance in the magnetic recording area 22 is completely erased by the information erasing element 12. Therefore, when the film 20 photographed by the camera of the present embodiment is reused by a camera having another information reproducing apparatus, the area where the film information 23 is erased (the photographing information 2 is recorded in this area)
4 is also included), the unexposed frame can be reliably detected, and the film 20 can be reused. On the contrary, since the unexposed frame can be surely detected without strict positioning of the recording magnetic head 10 for writing the photographing information 24 and the film 20, the accuracy of the positioning of the magnetic head 10 is loosened to reduce the cost. It is possible to plan. Moreover, since the structure is such that only the information erasing element 12 is added, the intended purpose can be achieved with a simple structure.

The details of the camera having the information recording apparatus of the present invention are not limited to the above-mentioned one embodiment, and various modifications are possible. As an example, a camera having the information recording apparatus of the present invention is a so-called pre-recorder of a type in which when a film is loaded into the camera, the entire amount of the film is once wound on a spool, and then the exposed film is sequentially stored in a cartridge. It can also be applied to a winding camera. Further, the distance between the recording magnetic head 10 and the information erasing element 12 is arbitrary, and the information erasing element 12 is the recording magnetic head 1.
The effect of the present invention can be obtained if it is located on the upstream side of 0 in the film feeding direction accompanying the exposure operation.
Furthermore, the structure for displaying the usage status on the film cartridge is not limited to the above-described embodiment, and the usage status can be omitted.

[0038]

As described above in detail, according to the present invention, the photographic information is recorded by the information recording means after the film information previously written on the film is erased by the erasing means. It is possible to reliably detect an unexposed frame by a camera having another information reproducing device without strictly positioning the means and the film,
The film can be reused.

[Brief description of drawings]

FIG. 1 is a diagram corresponding to a claim of the present invention.

FIG. 2 is a block diagram showing a circuit configuration of a camera having an information recording apparatus which is an embodiment of the present invention.

FIG. 3 is a plan view showing a film used in the camera of the embodiment.

FIG. 4 is a plan view showing a cartridge used in the camera of the embodiment.

FIG. 5 is a diagram showing mounting positions of a photo sensor, a magnetic head, and an information erasing element.

FIG. 6 is a plan view showing recording of photographing information on a film.

FIG. 7 is a flowchart for explaining a shooting sequence operation according to an embodiment.

FIG. 8 is a flowchart similar to FIG.

FIG. 9 is a flowchart for explaining the film take-out operation of the embodiment.

FIG. 10 is a time chart for explaining the operation of the embodiment.

[Explanation of symbols]

 1 Control Circuit 8 Information Recording Circuit 9 Recording Magnetic Head Driving Circuit 10 Recording Magnetic Head 11 Information Erasing Element Driving Circuit 12 Information Erasing Element 13 Winding Motor Driving Circuit 14 Film Winding Motor 15 Rewinding Motor Driving Circuit 16 Film Rewinding Motor 20 Film 21 Video recording area 22 Magnetic recording area 23 Film information 24 Shooting information

Claims (1)

[Claims] 1. A camera provided with a feeding means for feeding a film in which film information is previously written in an information recording area, and an information recording means for recording photographing information in at least a part of the information recording area, Erasing means for erasing the film information written in the information recording area, and the information recording means after the film is fed by the feeding means after the exposure operation is finished and the film information is erased by the erasing means. A camera having an information recording device, characterized by comprising: