JPH08262556A - Camera - Google Patents

Abstract

PURPOSE: To provide a camera constituted so that the optimum voltage condition of a battery can be set according to the type of a film or an exposure state and magnetic information can be surely read. CONSTITUTION: A PRS is a control circuit controlling the action sequence of the whole of the camera and an MDR 1 is a motor driver. An S1 is a sensor and the output thereof is inputted to the control circuit PRS. Then, the output of the sensor S1 is monitored by the control circuit PRS and the movement and the stop position of the film are recognized. An HCK is a magnetic information control circuit amplifying write-in information or read-out information with respect to a magnetic head H. An S2 is a sensor and the output thereof is inputted to the control circuit PRS, Then, the output of the sensor S2 is monitored by the control circuit PRS and the type of the film and a photographing state are recognized. An MDR 2 is a motor driver for driving a second motor M2 and an LM is a photometry means. By the control circuit PRS, the luminance information of an object is obtained by reading the output of the photometry means LM.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera using a film having a magnetic recording portion.

[0002]

2. Description of the Related Art In recent years, a photographic film is provided with a magnetic recording portion, and a camera writes data and the like at the time of photographing in this magnetic recording portion, and this information is read out in a later process of development or printing. A photographic system has been proposed for use (eg US Pat. No. 4,864,3).
No. 32). Further, a technique has been proposed in which a film taken halfway using such magnetic recording information is once rewound, then re-loaded, and automatically fed to an unexposed frame to continue shooting (for example, US Patent No. 4,878,
075, or JP-A-4-172432).
On the other hand, in such a photographic system, a disk-shaped recording member that records information such as film type, sensitivity, and the number of shots is provided on the film cartridge, and a technology is also proposed that indicates the shooting state of the film by the stop position of the disk. (For example, see Japanese Patent Laid-Open No. 5-313233).

[0003]

By the way, when the camera tries to read the magnetic recording information recorded in the magnetic recording portion provided on the photographic film, it is disclosed in Japanese Patent Laid-Open No. 5-7261.
As described in No. 0, the reproduction level of the magnetic reproduction signal becomes extremely low under the condition that the reversal film having a low density of the magnetic layer is used and the feeding speed of the film becomes slow, It is known that accurate reading of magnetically recorded information becomes difficult. There are several conditions that slow down the film feeding speed in the camera, such as changes in the film drawing force due to changes in operating temperature and variations depending on the type of film, but the biggest factor is the battery, which is the power source. To do. If the battery is new, has a high open circuit voltage, and has a low internal resistance, sufficient current is supplied to the motor, so the film feeding speed will hardly slow down. Generally, the feeding speed of the film is gradually reduced. Therefore, it is possible to provide a means for detecting the voltage of the battery inside the camera and permit the operation of the camera only when it is within the voltage range of the battery that guarantees the predetermined film feeding speed. Has been done.

However, conventionally, the voltage condition of the battery has been determined so that a predetermined film feeding speed is guaranteed regardless of the type of film. In such cases,
For example, if the voltage condition of the battery is determined according to a reversal film having a low magnetic layer density, it is a battery that can operate in a negative film that can read magnetic recording information even at a slower film feeding speed. Nevertheless, the operation of the camera is prohibited and the battery cannot be used up to the end. vice versa,
Magnetic recording information can be read even at a slow film feeding speed If the voltage condition of the battery is determined according to the negative film etc., the magnetic recording information cannot be read correctly when using the reversal film and malfunction may occur. There was a problem that the sex became large.

The present invention has been made in order to solve such a conventional problem, and it is possible to set an optimum battery voltage condition according to the type of film and the exposure state, and to reliably read magnetic information. The purpose is to provide a camera that can.

[0006]

The structure for realizing the object of the invention according to the present application is, as described in claims 1 to 3, an information display member indicating the kind of the film in the cartridge portion and the exposure of the film. With an information display member showing the state,
In a camera using a film having a magnetic recording section in the film section, first information reading means for reading information indicating the type of film from the information display member indicating the type of film, and an information display member indicating the exposure state of the film. Second information reading means for reading information representing the exposure state of the film, power supply voltage detection means, storage means for storing a plurality of power supply voltage reference levels in advance, the first information reading means and the first information reading means. Selecting means for selecting one power supply voltage reference level from the plurality of power supply voltage reference levels stored in the storage means upon receiving the output of the second information reading means; and one power supply selected by the selecting means. Comparison means for comparing a voltage reference level with the power supply voltage detected by the power supply voltage detection means, and a comparison result of the comparison means And to set the voltage condition of optimal cell combined let a determination means for determining whether or not to permit loading of the film to the type and exposure condition of the film.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a perspective view showing the structure of a film cartridge, a film and its peripheral portion in a camera which is an embodiment of the present invention. In the figure, CT is a film cartridge, K is an opening / closing member for opening and closing the light-shielding lid at the film exit of the film cartridge CT, and DD is a type of film according to a black and white pattern,
Information display member for displaying information such as sensitivity and number of shots, FK
Is a fork for feeding and rewinding the film by rotating the shaft of the cartridge. The information display member DD is a disk-shaped member similar to the technique described in the above-mentioned Japanese Patent Laid-Open No. 5-313233, and is a fork F.
It is rotated by the rotation of K, and the stop position of this disk also represents the filming state of the film, that is, information such as unexposed, partial exposed, or exposed all frames. S20
Information reading means S21 and S21 are constituted by, for example, a photo reflector, and are for reading the black and white pattern while rotating the information display member DD.

SW40 and SW41 are film cartridge presence / absence detection switch contacts that are short-circuited when the film cartridge CT is loaded in the camera, KT is an opening / closing drive member for driving the opening / closing member K, and SW30 and SW31 are light-shielding. A light-shielding lid opening / closing detection switch contact piece for detecting the opening / closing of the lid, and when the opening / closing drive member KT drives the opening / closing member K and is in the open position of the light-shielding lid, by the conduction portion SW32 on the opening / closing drive member KT. It is detected that the light blocking lid is driven to the open position by being short-circuited.

FM is a film, T is a film FM
The upper magnetic tracks, P0 to P3, are perforations for positioning the photographing screen. S10 and S1
Reference numeral 1 is a sensor for detecting the movement and stop position of the film by monitoring the perforations P0 to P3, and is constituted by, for example, a photo reflector.
H is a magnetic head for reading and writing magnetic information on the magnetic track T, and PA is a pad for pressing the magnetic track T on the film FM against the magnetic head H. M1 is a first motor for winding and rewinding the film, G1 is a gear train for connecting the motor M1 to the fork FK and the film winding spool, and M2 is for driving the opening / closing drive member KT. G2 is a second motor for operating the motor M2 and the opening / closing drive member K.
It is a gear train for connecting with T.

FIG. 2 shows an electric circuit configuration of a camera which is an embodiment of the present invention. In the figure, PRS is a control circuit for controlling the operation sequence of the entire camera, and is composed of, for example, a microcomputer. A description of a specific operation sequence of the control circuit PRS will be given later. BCK is a battery check circuit serving as a power supply voltage detection means, and is composed of, for example, a circuit for A / D converting the voltage of the battery, and outputs the conversion result to the control circuit PRS. The MEM is a memory circuit that serves as a storage means, and is composed of, for example, a ROM or an EEPROM. A plurality of power supply voltage reference levels necessary for guaranteeing the operation of the camera are written and stored in the memory circuit MEM in advance.
More readable. Here, three types of power supply voltage reference levels are prepared, which will be referred to as reference level 1, reference level 2, and reference level 3, respectively. Comparing the respective reference levels, the reference level 1 is the highest voltage level, the reference level 2 is the next highest voltage level, and the reference level 3 is the lowest voltage level. In other words, the voltage of the battery of reference level 1 or higher is required under the condition that the film must be fed at the earliest, and conversely, if the film can be fed because it is the minimum speed, the reference A battery voltage of level 3 or higher will be required.

MDR1 is a motor driver for driving the first motor M1 described in FIG. 1, and is controlled by the control circuit PRS to drive the motor M1 for forward rotation, reverse rotation, braking and the like. S1 is the sensors S10 and S11 described in FIG. 1, the outputs of which are input to the control circuit PRS, and the control circuit PRS can know the movement of the film and its stop position by monitoring the outputs of these sensors. it can. HCK is a magnetic information control circuit that outputs write information to the magnetic head H described in FIG. 1 and amplifies read information from the magnetic head H. The control circuit PRS outputs necessary information to the magnetic information control circuit HCK when recording magnetic information on the film, and monitors the output of the magnetic information control circuit HCK when reading magnetic information from the film. S
Reference numeral 2 denotes the sensors S20 and S21 described in FIG. 1, the outputs of which are input to the control circuit PRS.
Can monitor the output of these sensors to know the film type and shooting condition. Figure 1 for MDR2
It is a motor driver for driving the second motor M2 described above, and is controlled by the control circuit PRS to drive the motor M2 in forward rotation, reverse rotation, braking, and the like.

SW1 is a release switch of the camera and is input to the control circuit PRS. SW2 is a switch for detecting opening / closing of a lid of a film cartridge storage chamber (not shown), and is input to the control circuit PRS. SW3 is a switch composed of the light-shielding lid open / closed detection switch contacts SW30 and SW31 and the conducting portion SW32 described in FIG.
Input to S. SW4 is a switch composed of the cartridge presence / absence detection switch contacts SW40 and SW41 described in FIG. 1, and is input to the control circuit PRS as a cartridge presence / absence detection switch.

The LM is a photometric means composed of, for example, a phototransistor, and its output is the control circuit PR.
Input to S. The control circuit PRS can obtain the brightness information of the subject by reading the output of the photometric means LM. DM is a distance measuring means composed of, for example, a CCD line sensor, and its output is input to the control circuit PRS. The control circuit PRS can obtain information on the distance to the subject by reading the output of the distance measuring means DM. SH is an exposure control unit including, for example, a shutter and a diaphragm, and exposes the film based on a signal output by the control circuit PRS. The LDR is a lens driving unit including, for example, a motor, a drive circuit thereof, a transmission mechanism, and the like, and drives the lens based on a signal output by the control circuit PRS. The DSP is a display unit including, for example, an LED or an LCD, and performs various displays based on the signal output by the control circuit PRS.

Next, a specific operation sequence of the control circuit PRS will be described with reference to the flowcharts of FIGS. 3 and 4. When the power switch (not shown) is turned on and the control circuit PRS becomes operable, the control circuit PRS operates by following each step from step 1 in FIG. It should be noted that the step in each operation below is abbreviated as “#”.

First, the control circuit PRS initializes memory and ports (# 1).

Next, the state of the cartridge presence / absence switch SW4 is checked (# 2). If off,
Since the cartridge is absent, that is, the film cartridge is not inserted in the camera, the apparatus waits for the film cartridge to be inserted. When the film cartridge is inserted into the camera and SW4 is turned on, the process proceeds to # 3.

Next, the state of the switch SW2 for detecting the opening / closing of the lid of the film cartridge storage chamber is checked (# 3). If it is off, the lid of the film cartridge storage chamber is still open, so wait for it to be closed. When the lid of the film cartridge storage chamber is closed, when SW2 is turned on, the process proceeds to # 4.

Then, the reference level 3 which is the lowest voltage level from the memory circuit MEM is input (# 4). This is enough to guarantee that the opening / closing drive member KT is driven to open the light-shielding cover and the information display member DD is rotated.

Next, information on the battery voltage is input from the battery check circuit BCK (# 5). Then, the input reference level 3 is compared with the battery voltage information (#
6). If the voltage of the battery is equal to or higher than the reference level 3, the opening / closing driving member KT is driven, or the information display member DD
Can be rotated, proceed to # 7, motor driver MD
A control signal is output to R2 to start driving the second motor M2 (# 7).

Next, the information of the light shielding lid opening / closing detecting switch SW3 is input to indicate that the light shielding lid is opened.
It waits until the ON state of is detected (# 8). When the on state of the switch SW3 is detected, the motor driver M
A control signal is output to DR2 to stop driving the second motor M2 (# 9). Further, a control signal is output to the motor driver MDR1 to start driving the first motor M1.
As a result, the rotation of the information display member DD is started (#
10).

Then, the signal from the sensor S2 is input to read the information by the information display member DD (# 11). As a result, information on the type of film and the exposure state can be obtained. After that, when the information reading from the information display member DD is completed, a control signal is output to the motor driver MDR1 to output the first signal.
The drive of the motor M1 is stopped (# 12).

If the voltage of the battery is lower than the reference level 3 in the above step # 6, # 1
Since the voltage of the battery is insufficient for driving the motor in step 3, a signal is output to the display means DSP to display a warning indicating that the battery is defective (# 13).

When step # 12 in FIG. 3 is completed, the process proceeds to step # 14 in FIG. 4, and it is checked whether, of the information read in step # 11, the information on the exposure state of the film is information indicating partial exposure ( # 14). If it is not partial exposure, the process proceeds to step # 15.

Then, similarly, it is checked whether or not the information on the exposure state of the film is information indicating unexposed (#
15). If it is not unexposed, the process proceeds to step # 16.

If the information on the exposure state of the film is neither partially exposed nor unexposed, it means that the film which has been exposed or developed for all frames has been inserted into the camera. Since it is not possible to shoot with such a film, a control signal is output to the motor driver MDR2 to close the light-shielding cover to start driving the second motor M2 (#
16).

Next, the information of the light shielding lid opening / closing detecting switch SW3 is inputted, and the switch SW3 indicating that the light shielding lid is closed is inputted.
It waits to detect the off state of (# 17). Switch S
When the off state of W3 is detected, a control signal is output to the motor driver MDR2 to stop the driving of the second motor M2 (# 18). Then, a signal is output to the display means DSP to display a warning so as to prompt the user to take out the film (#
19).

Next, the state of the switch SW2 for detecting the opening and closing of the lid of the film cartridge storage chamber is checked (# 20). When SW2 is turned off, which indicates that the lid of the film cartridge storage chamber is opened, it is determined that the film is taken out, and the process returns to # 1 in FIG.

If it is determined in step # 15 that the information regarding the exposure state of the film indicates that the film has not been exposed, the process proceeds to step # 21.

Then, the reference level 3 which is the lowest voltage level from the memory circuit MEM is input (# 21). When the unexposed film is loaded, the magnetic signal is not read out, so it is sufficient if the motor drive can be guaranteed.
Then, information on the battery voltage is input from the battery check circuit BCK (# 22). Then, the reference level input and the information on the battery voltage are compared (# 23). If it is determined that the battery voltage is lower than the reference level, the process proceeds to step # 13 described above to display a warning, but if not, the process proceeds to step # 24.

In step # 24, a control signal is output to the motor driver MDR1 to start driving the first motor M1.
This starts the film loading. When the film is loaded, rewound, or the information display member DD is rotated by one motor M1, the power transmission mechanism may need to be switched by some means. However, the description thereof is omitted because it is not related to the gist of the present application.

Next, of the information read in the step of # 11, it is checked whether the information on the exposure state of the film is information indicating partial exposure (# 25). In this case, since partial exposure is not performed but unexposed, the process proceeds to step # 26. Then, the output of the sensor S1 is monitored to wait for the film to be fed to the position of the first frame (# 2).
6). When it is detected that the image has been sent to the position of the first frame, the process proceeds to # 27, where a control signal is output to the motor driver MDR1 to stop the driving of the first motor M1 (# 2).
7). This completes film loading.

If it is determined in step # 14 that the information on the exposure state of the film is information indicating partial exposure, the process proceeds to step # 28, and the information read in step # 11 is read. It is checked whether or not the information on the type of film is information indicating a reversal film (# 28). If the information does not represent the reversal film, the process proceeds to # 29.

In # 29, the reference level 2 which is the second highest voltage level from the memory circuit MEM is input (# 2).
9). When a partially exposed film is loaded, the magnetic signal is read, so the film feed speed necessary to ensure this can be secured. It is necessary to compare the battery voltage with a higher voltage level.

Thereafter, the process proceeds to step # 22 described above, the reference level 2 is compared with the voltage of the battery, and if the voltage of the battery is higher, the process proceeds to step # 24 to start the film loading. Since this is a partially exposed film, the process proceeds from # 25 to # 30.

In step # 30, the magnetic information recorded on the film is read by monitoring the output of the magnetic information control circuit HCK, and while the output of the sensor S1 is monitored, the frame portion already photographed is continuously sent, and Wait until the exposure frame portion is detected (# 30). A frame that has already been photographed and a frame that has not been exposed are distinguished from each other by determining that a frame for which it is possible to determine from the magnetic information that information indicating that the frame has already been photographed has been written on the magnetic track is already photographed.
When the unexposed frame portion is detected, the process proceeds to step # 27 to end the film loading.

If it is determined in step # 28 that the information regarding the type of film is information indicating a reversal film, the process proceeds to step # 31.

At # 31, the reference level 1 which is the highest voltage level than the memory circuit MEM is input (# 31).
When a partially exposed film is loaded, the magnetic signal is read, so the film feed speed necessary to ensure this can be secured. As mentioned above, it is necessary to compare the voltage of the battery with the higher voltage level, but in the reversal film, since the density of the magnetic layer is low, the highest voltage level and the battery of the battery are increased so that the film feeding speed is further increased. It is necessary to compare the voltages. Thereafter, the process proceeds to step # 22 described above, the reference level 3 is compared with the voltage of the battery, and if the voltage of the battery is higher, the process proceeds to step # 24 to start the film loading. After that, the process proceeds from # 25 to # 30, and the loading ends at # 27, as described above.

When the loading of the film is completed, the camera is ready to take a picture, but the description of the subsequent operations is omitted because they are all known techniques.

(Correspondence between invention and embodiment) The information display member described in the claims corresponds to the information display member DD described in the embodiments, and the first information reading means described in the claims. The second information reading means corresponds to the sensor S2 including the sensors S20 and S21 described in the embodiments. Further, the power supply voltage detection means described in the claims corresponds to the battery check circuit BCK described in the embodiment, the storage means described in the claims corresponds to the memory circuit MEM, respectively. The selection means described are # 14, # 15, # of the operations of the control circuit PRS described in the embodiment.
21. # 28, # 29, and # 31 correspond to the respective steps, and the comparison means described in the claims corresponds to the step # 23 in the operation of the control circuit PRS described in the embodiment. Corresponding to the above, the determination means described in the claims corresponds to # 23 in the operation of the control circuit PRS described in the embodiment.
To the steps # 24 to # 24.

The above is the correspondence relationship between each configuration of the embodiments and each configuration of the present invention, but the present invention is not limited to the configurations of these embodiments, and the functions shown in the claims or It goes without saying that any structure may be used as long as the functions of the structure of the embodiment can be achieved.

Further, the present invention may be combined with each of the above embodiments or their technical elements as required.

Further, the present invention is applied to various forms of cameras such as a single-lens reflex camera and a lens shutter camera, further to optical devices and other devices other than the cameras, and further to those cameras and optical devices and other devices. The present invention can also be applied to the device or the constituent elements thereof.

[0043]

As described above, according to the first aspect of the invention, the cartridge portion is provided with the information display member indicating the type of film and the information display member indicating the exposure state of the film, and the film portion is provided with the magnetic recording portion. In a camera using a film having, a first information reading means for reading information representing a film type from an information display member representing the film type, and an exposure state of the film being displayed from an information display member representing an exposure state of the film. Second information reading means for reading information, power supply voltage detecting means, storage means for storing a plurality of power supply voltage reference levels in advance, outputs of the first information reading means and the second information reading means are input. Selecting means for selecting one power supply voltage reference level from the plurality of power supply voltage reference levels stored in the storage means, and the selecting means. Comparing means for comparing one selected power supply voltage reference level with the power supply voltage detected by the power supply voltage detecting means, and determining whether to permit film loading based on the comparison result of the comparing means. By making it possible to set the optimum battery voltage condition according to the type of film and the exposure state, it is possible to read the magnetic information reliably, and it is possible to reliably load the film. .

Further, according to the invention described in claims 2 and 3, it is possible to compare with the optimum reference voltage level according to the type of film and the exposure state.

[Brief description of drawings]

FIG. 1 is a perspective view showing a configuration of a film cartridge and a film of a camera according to an embodiment of the present invention, and a peripheral portion thereof.

FIG. 2 is an electric circuit configuration of a camera embodying the present invention.

FIG. 3 is a flowchart showing an operation of the control circuit shown in FIG.

FIG. 4 is a flowchart showing an operation of the control circuit shown in FIG.

[Explanation of symbols]

 CT film cartridge DD information display member S20, S21 information reading means T magnetic track H magnetic head M1 first motor M2 second motor PRS control circuit BCK battery check circuit MEM storage means DSP display means

Claims (3)

[Claims] 1. A camera using a film having an information display member showing a film type in a cartridge part and an information display member showing an exposure state of the film, and using a film having a magnetic recording part in the film part, showing the kind of the film. First information reading means for reading information indicating the type of film from the information display member, second information reading means for reading information indicating the exposure state of the film from the information display member showing the exposure state of the film, and power supply voltage Detection means; storage means for storing a plurality of power supply voltage reference levels in advance; and outputs stored in the storage means by inputting outputs of the first information reading means and the second information reading means. Selection means for selecting one power supply voltage reference level from a plurality of power supply voltage reference levels, and one power supply voltage selected by the selection means Comparing means for comparing a reference level with the power supply voltage detected by the power supply voltage detecting means, and judging means for judging whether or not to permit film loading based on the comparison result of the comparing means. Characteristic camera. 2. The power supply voltage reference level selected from the plurality of power supply voltage reference levels according to whether or not the output of the first information reading means is recognized as information representing a reversal film. The camera according to claim 1, wherein the cameras are different. 3. The power supply voltage reference level selected from the plurality of power supply voltage reference levels according to whether or not the output of the second information reading means is recognized as information indicating partial exposure. The camera according to claim 1 or 2, wherein the cameras are different from each other.