JP2875943B2 - Automatic film winding camera - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic film winding camera using a roll film such as a so-called brownie film.

[0002]

2. Description of the Related Art In recent years, there has been developed a camera using a roll film which employs an automatic winding system driven by a motor as a film winding system. In such an automatic film winding camera, a film winding lever or a winding knob is generally omitted.

[0003]

When a roll film is loaded into a camera, the spool is gradually rotated while inserting the leader of the film into the groove of the spool on the take-up side and pressing the back of the film. Then, the film is wound around the spool. In this film loading operation, it is necessary to delicately change the amount of turning the spool, the speed, and the like in accordance with how the film is pressed.

However, the conventional automatic film winding camera has a problem that it is difficult to load the film because it does not have a function of adjusting the rotation amount and the rotation speed of the spool.

In the case of a manual winding camera having a film winding lever and a knob, such a problem does not occur. However, it is unreasonable to provide a film winding lever or the like in the automatic winding camera only for loading a film. .

SUMMARY OF THE INVENTION An object of the present invention is to provide an automatic film wind-up camera capable of loading a roll film by the same operation as a manual wind-up camera.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to an automatic film winding type camera using a roll film, and a motor for rotating a spool receiving shaft to which a spool for winding a roll film is attached. A back cover opening / closing detecting means for detecting opening / closing of the back cover; a rotary switch for switching various modes such as a photographing mode; a rotation amount detecting means for detecting a rotation amount of an operation ring of the rotary switch; When it is recognized from the signal from the means that the back cover is opened, the rotation amount and the rotation speed of the operation ring of the rotary switch are recognized based on the signal from the rotation amount detection means, and the rotation amount and the rotation speed are determined. Control means for controlling the motor to rotate the spool receiving shaft at a corresponding rotation amount and rotation speed It is characterized in that it comprises.

[0008]

According to the present invention, a rotary switch is used as a switch for switching between various modes, and when the film is loaded, the operation ring is turned to rotate the film at a rotation amount and rotation speed corresponding to the rotation amount and rotation speed of the operation ring. The take-up spool is rotated. Therefore,
The operation ring of the rotary switch has the same function as the film winding knob or the winding lever of the manual winding type camera.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 shows an automatic winding camera for a roll film to which the present invention is applied. As shown in the figure, a spool (represented by a two-dot chain line) 1 for winding the roll film F is provided with a pair of spool receiving shafts (a lower spool in FIG. (Only the receiving shaft is shown).
Although not shown, the rotating shaft of the motor is connected to one of the upper and lower spool receiving shafts 3 via a gear transmission mechanism.

In the camera of the present invention, a rotary switch 4 is provided as a switch for switching between various modes such as a photographing mode such as a shutter speed priority mode, a manual mode, and an aperture priority mode. In this embodiment, the rotary switch 4 is
It comprises an operation ring 6 rotatably attached to the camera body 5, and a rotation amount detector 7 such as an encoder capable of detecting a rotation amount when the operation ring 6 is turned. Since this operation ring 6 is used as a film winding knob or lever when loading a film, it is preferably arranged above the film chamber 2 on the winding side as shown in FIG.

Further, the camera is provided with a back cover switch 9 for detecting whether the back cover 8 is open or closed. Although not clearly shown in FIG. 1, the back cover switch 9 is a conventional switch such as a limit switch.

In such a camera, the control means for controlling the film winding motor mainly comprises a CPU (so-called one-chip microcomputer) 10, as shown in FIG. The rotation amount detector 7 and the back cover switch 9 described above are connected to the CPU 10, and these output signals are input. A drive circuit 12 for a motor 11 is connected to the CPU 10.
The drive of the motor 11 is controlled according to a control signal output from 0.

Next, the control of loading the film by the CPU 10 having the above configuration will be described with reference to the flowchart of FIG. The operation ring 6 is turned only in the direction in which the film F is wound, that is, in the direction indicated by the arrow 13 in FIG.

First, the position data of the operation ring 6 at that time is read from the rotation amount detector 7, and the data value is set in the RAM as "A" (step 2).
0). Next, when it is detected in step 21 that the back cover switch 9 is OFF, it is determined that the back cover 8 is opened and the film F can be loaded, and the process proceeds to step 22. On the other hand, back cover switch 9 is ON
In this case, since the back cover 8 is closed, it is determined that the film cannot be loaded, and the process is terminated.

In step 22, the position data of the operation ring 6 is read again from the rotation amount detector 7, and the next step 2
At 3, the data value "A" is subtracted from the data value "B". This subtraction value is the rotation amount of the operation ring 6.

Next, the rotation amount of the rotating shaft of the motor 11 corresponding to the rotation amount is determined. Then, a control signal is issued to the motor drive circuit 12 to drive the motor 11 with the rotation amount for a preset time (step 24).

Thereafter, in step 25, the position data value "B" previously obtained in step 22 is set to "A" and RA
Set to M. This value “A” is used to determine the rotation amount of the operation ring 6 in the next loop processing.

In order to make the time required for one loop process constant, in other words, to make the sampling time of the rotation amount of the operation ring 6 constant, a timer process is performed (step 26), and step 21 is performed. Return to

By repeating the above steps, the rotating shaft of the motor 11, that is, the spool receiving shaft 3
Is rotated at a rotation amount and a rotation speed corresponding to the rotation amount and the rotation speed. As a result, the operation ring 6 for switching between various modes can be used like a conventional film winding knob or lever, and the loading of the roll film F can be performed by each user.

When the loading of the film F is completed and the back cover 8 is closed, the back cover switch 9 is turned on, and the camera enters a stand-by state capable of photographing (step 21).

The above-described film loading processing is an example, and it goes without saying that the contents of the processing are not limited to those described above, as long as the operation ring 6 of the rotary switch 4 has a function equivalent to that of the film winding knob. No.
The content and flow of the processing can be appropriately changed depending on the type of the rotation amount detector for detecting the rotation amount of the operation ring 6 of the rotary switch 4 and the like.

[0023]

As described above, the present invention utilizes a rotary switch for switching a mode normally provided in a camera, and provides an operation ring having the same function as a film winding knob or a film winding lever. I have. Therefore, even with a camera of the automatic film winding type using a motor, loading of a roll film can be performed with the same feeling as that of a conventional manual winding type camera. This enables the film loading operation according to the user's preference and habit, and also has the effect of suppressing the occurrence of thickening and unwinding.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of an automatic film winding camera to which the present invention is applied.

FIG. 2 is a block diagram showing a CPU serving as control means of a film winding motor of the camera according to the present invention, and its connection elements.

FIG. 3 is a flowchart illustrating an example of a film loading process.

[Explanation of symbols]

Reference numeral 1 denotes a film winding spool; 2 denotes a film chamber; 3 denotes a film chamber.
Spool receiving shaft, 4 ... Rotary switch, 5 ... Camera body, 6 ... Operation ring, 7 ... Rotation detector, 8 ... Back cover,
9 back cover switch, 10 CPU, 11 motor, 12
... Motor drive circuit.

Claims (1)

(57) [Claims] An automatic film winding type camera using a roll film, a motor for rotating a spool receiving shaft to which a spool for winding a roll film is attached, a back cover opening / closing detecting means for detecting opening / closing of a back cover, A rotary switch for switching between various modes such as a photographing mode; a rotation amount detecting means for detecting a rotation amount of an operation ring of the rotary switch; and a signal from the back cover opening / closing detecting means that the back cover is opened. In this case, the rotation amount and the rotation speed of the operation ring of the rotary switch are recognized based on a signal from the rotation amount detection means, and the spool receiving shaft is rotated at a rotation amount and a rotation speed corresponding to the rotation amount and the rotation speed. Control means adapted to control the motor to rotate the Roll-up camera.