JP2825686B2 - camera - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera, and more particularly, to a camera film feeder.

[0002]

2. Description of the Related Art Heretofore, sensitivity information of a film set in a camera body has been read by using a contact piece or the like, and the film is automatically fed (e.g.,
Over door loading) to perform is known. In many cases, these are controlled in combination with a signal such as a switch for detecting whether the back cover of the camera is open or closed (hereinafter, the switch is abbreviated as SW).

FIG. 3 shows this conventional example. Z1 is a SW that changes according to the opening and closing of the back cover.
Level) and closed (off (L level)). When this signal is at the L level in the feed control circuit Z2, no power is supplied to the film feeding motor Z4. In this example, the sensitivity information of the film is read by three contact pieces SW of ISO3 to 1. If at least one of these SWs is in a conductive state, the information is transmitted through an inverter (Z5 to 7) and an OR gate Z8. The film presence signal FILM is set to the H level. The feed control circuit Z confirms that the FILM terminal is at the H level and the back cover SW signal is off.
When 2 is detected, energization of the motor Z4 is started, a signal from the film feed amount detecting means Z9 is monitored, and a film stop process is performed when a predetermined amount of film has been wound.

[0004]

In this prior art, sensitivity information of a film is read by three switches and is used as film presence / absence information. This is because the number of SW pieces that can be installed needs to be reduced due to the restrictions on the structure of the camera and the manufacturing cost, and a new SW etc. for detecting the presence or absence of the film storage patrone is provided. This is because it is difficult. In this embodiment, three SWs
Eight types depending on the combination of the contact state, that is, no film, ISO50, 100, 200, 400, and 80
0, 1600 and 3200 can be distinguished. However, when an ISO25 film or a film without a so-called DX code is loaded, it cannot be distinguished from a case without a film, so that it is impossible to automatically feed the film as described above.

Therefore, it is configured such that, even if film sensitivity information is not detected, when a photographing operation is performed, a winding operation for one frame of film is always performed, and the photographing operation is performed a predetermined number of times (for example, four frames) (empty). There is also known a camera which can be used in the same manner as when a film having film sensitivity information is used if the winding operation is normally performed. However, it is necessary to release the film a predetermined number of times and the operation is troublesome.

In addition, when a beginner loads a film from which sensitivity information cannot be read, if a beginner does not know that an empty release is necessary, shooting is started even if the film is not sent to a predetermined position where shooting is possible. It is easy to misunderstand. Further, in the worst case, when the film is not loaded properly due to the above-described winding operation for one frame, the photographer has wound up even though the film has not been wound up at all. I get the illusion of something and end up shooting nothing.
These are fatal problems for the photographer in that what he / she wants to photograph cannot be photographed.

On the other hand, in order to prevent such a fatal accident, an automatic film feeding mechanism is provided whenever the back cover is closed based on only a signal corresponding to the opening and closing of the back cover, regardless of the film sensitivity information. One that activates is also known. However, in this case, even if no film is loaded, the film feeding operation is automatically performed when the back cover is closed, so that wasteful power is consumed. Furthermore, at this time, if the system is configured to prohibit the photographing operation unless a normal film index signal is received, the operation check when no film is loaded cannot be performed. turn into.

An object of the present invention is to solve the various problems described above in conventional camera points, rather easy to use than the prior art, it is to provide a camera having an improved film transport device.

[0009]

According to a construction for realizing the object of the invention according to the present invention, a film sensitivity information reading means is provided by a flash.
Based on the ability to read the film sensitivity information,
Judge whether film is loaded in the
In a camera that performs a loading operation,
Lum sensitivity information reading means reads film sensitivity information
If not, drive the film feed motor and
Film feed that can detect whether or not
Film is output to the camera based on the output of the
Judge whether it is loaded, and based on the result,
The automatic loading operation is started.
This configuration does not require the photographer to perform cumbersome operations.
And no extra film automatic feed operation is performed.
If the film is not sent normally,
Can be prohibited and the photographer can be warned appropriately .

[0010]

FIG. 1 shows an embodiment of the present invention. Reference numeral 1 denotes a switch that changes according to the opening and closing of the back cover.
(H level) and off (L level) when closed. If this signal is at the L level in the feed control circuit 2, the motor 4 for feeding the film is not energized. In this example, the sensitivity information of the film is read by three contact pieces SW of ISO 3 to 1, and if at least one of these switches is in a conductive state, the film is present via the inverters 5 to 7 and the OR gate 8. The signal FILM is set to the H level. The FILM terminal is at the H level and the back lid S
When the feeding control means 2 detects that the W signal is off, the power supply to the motor 4 is started, and the signal from the film feeding amount detecting means 9 is monitored, and a predetermined amount (often 3 to 3) is supplied.
When the film (4 frames) is wound up, the film stop processing is performed. This is similar to the conventional example shown in FIG.

On the other hand, all the contact pieces SW of ISO3 to 1 are of
In the case of f, when the photographing operation completion signal AE_AND from the exposure control means 10 is input to the feed control circuit 2, the power supply to the motor 4 is started, and the film feed amount detection means 9 is started.
Monitor the signal from. Then, when a detection signal of at least a film movement amount detectable by the film feeding state detection means 9 is output, the output signal FILM of the signal change counter 11 becomes active. This FILM signal and IS
AND gate 12 using SW signal of O3-1 as input signal
Becomes H level. The output signal of the AND gate 12 is input to the feed control circuit 2. If this signal is active, the film feed operation is further performed by a predetermined amount. This operation is performed only when the output of AND gate 12 is active.

In this way, even if the film cannot be detected by the film sensitivity reading means, if the photographer performs a single photographing operation after loading the film, the film is automatically moved to a predetermined photographable position. Can be sent to In addition, when the film is not actually loaded, the output signal FILM of the signal change counter 11 is not activated, so that the output signal of the AND gate 12 is not activated, and the output signal FILM becomes a predetermined time, for example, 0.5 second. After about time elapses, it is output from the timer 13 to the feed control circuit,
In response, the power supply to the motor is stopped. Therefore,
There is no need to perform extra long-time energization.

If the output of the AND gate 12 is active and the film is fed further, and if a predetermined amount of film cannot be fed, the output of the timer 14 is output for a predetermined time (for example, 3 seconds). Becomes H level,
A signal having this signal and the output of the AND gate 12 as input signals
The output of the ND gate 15 becomes active,
When input to the gate 16, a change in the state of the shooting operation switch 17 is not input to the exposure control means 10, so that the shooting operation is prohibited. In this way, the filming operation is not accepted unless the film is normally sent, so that even if the film is not normally at the predetermined position, the photographer may mistakenly determine that the photographer is taking a picture. Can be prevented.

When the back cover SW signal is turned on, the output signal of the AND gate 12 and the timer is reset. Therefore,
Once the back lid is opened, the prohibited state of the photographing operation is released.

[Other Embodiments] In the embodiment described above, the film sensitivity information reading SW, the back cover SW, and the logic gate are combined. If used as a circuit, it can also be realized by incorporating software (program) according to the flowchart shown in FIG. 2 into the ROM of the microprocessor.

The description of this flowchart is omitted.

[0017]

As described above , according to the present invention ,
For example, even if the film loaded in the camera cannot be determined by the film sensitivity information reading means, the photographer does not need to perform cumbersome operations and does not perform an extra automatic film feeding operation. A camera was realized.

[Brief description of the drawings]

[1] Overview schematic representation of a control system of an embodiment of a camera film feed device of the present invention.

FIG. 2 is a flowchart in a case where an operation performed in the configuration shown in FIG. 1 is realized by software;

FIG. 3 is a schematic diagram of a conventional control system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Back cover SW 2 ... Feed control device 4 ... Feed motor 5-7 ... Inverter 8 ... OR gate 9 ... Feed amount detection means 10 ... Exposure control device 17 ... Photographing SW

Claims (1)

(57) [Claims] 1. A film sensitivity information reading means comprising :
Camera based on the ability to read the
Determine whether the film is loaded and
In the camera which performs the reading operation, the film sensitivity information reading means may include the film sensitivity information.
If you cannot read the image, drive the film feed motor
To detect whether the film is being fed.
The camera feeds to the camera based on the output of the
To determine if the film is loaded, and
Starts auto loading operation based on
And the camera.