JP2546207B2 - camera - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to a camera in which a lens barrel can be moved to a plurality of positions and one frame of film is wound up when one scene is photographed. .

B. Conventional Technology and Problems There are known multifocal cameras in which the lens barrel can be switched to three positions, for example, the most retracted position, the wide-angle position, and the telephoto position by driving the motor by a switch operation.

However, in the conventional multifocal camera of this type, for example, when the power supply battery is dropped while switching the lens barrel from the wide-angle position to the telephoto position, the lens barrel is moved between both positions, that is, at a position other than the original focal position. Even if the battery was stopped and a new battery was loaded, it did not switch to the predetermined position (telephoto position).
For this reason, if the image is taken as it is after the battery is reloaded, the images are not properly formed and an undesired photo is taken.

An object of the present invention is to provide a lens barrel drive control device for a multifocal camera, which solves the above-mentioned problems by driving a photographing lens barrel to a predetermined position after loading a battery, when the lens barrel is not at the predetermined position. Especially.

In a camera that winds one frame of film at the time of shooting one scene, if the power supply battery drops during winding, the film will stop during winding and the film will no longer be fed even if a new battery is installed. Multiple exposure occurs. It is another object of the present invention to provide a film feeding device which solves the above-mentioned problems by winding the film to the specified state when the film is not wound to the specified state when the battery is attached. .

C. Means for Solving Problems Referring to FIG. 1, which is a diagram corresponding to claims, according to the present invention, the lens driving means 105 sets the photographing lens barrel 101 to a plurality of stop positions, and It is applied to a camera that winds up one frame of film by the film feeding means 107 at the time when the photographing is completed.

And a loading operation detecting means for detecting the loading operation of the battery
103, position detection means 104 for detecting the position of the lens barrel 101 of the taking lens, film winding detection means 108 for detecting the film winding state, and position detection when the loading operation is detected by the loading operation detection means 103. The position of the taking lens barrel 101 is discriminated from the detection result of the means 104, and when the position is different from the predetermined stop position, the lens driving means 105 is controlled so as to drive to the predetermined stop position. Lens barrel drive control means 106 and loading operation detection means 103
When the loading operation is detected by the, the film winding state is confirmed from the detection result of the film winding detecting means 108, and when the above state is different from the predetermined state, when the lens driving means 105 is in the inoperative state. And a feeding control means 109 for controlling the film feeding means 107 so as to wind the film up to a predetermined state.
This solves the above problem.

D. Operation When the loading operation of the battery is detected, the position of the taking lens barrel 101 is discriminated. If the position is different from the predetermined stop position, it is driven to the predetermined stop position. On the other hand, when the loading operation of the battery is detected, the winding state of the film is confirmed, and if the state is different from the predetermined state, the film is wound up to the predetermined state when the lens is not driven. Is done.

E. Embodiment An embodiment of the present invention will be described with reference to FIGS. 2 and 3.

FIG. 2 shows a control block diagram, and 1 is a power supply battery for applying a voltage to the CPU 2 and the motor drive circuit 3. CP
A battery detection switch 4 for detecting whether or not the battery 1 is loaded in the camera is connected to U2. The switch 4 is turned on when the battery lid is closed after the battery is turned on, that is, when the battery loading operation is completed, and turned off when the battery lid is opened. The CPU 2 is also connected to switches 5 and 6 which form an encoder for detecting the position of the lens barrel 8. C
PU2 controls the motor drive circuit 3 according to the procedure described later based on the detection results of the switches 4, 5, and 6. A lens barrel drive motor 7 is driven by the motor drive circuit 3, and the lens barrel 8 is driven by this motor 7. The CPU 1 is also connected to a phase switch 11 which outputs a pulse signal each time the film is wound up one frame. A film winding motor 12 is driven by a motor drive signal from the motor drive circuit 3.

In the above embodiment, the motor drive circuit 3 and the lens barrel drive motor 7 are the lens drive means 105, and the motor drive circuit 3 and the film feed motor 12 are the film feed means 107.
The switch 4 is the loading operation effecting means 103, and the switches 5 and 6 are
Is a position detecting means 104, the switch 11 is a film winding detecting means 108, and the CPU 2 is a lens barrel drive controlling means 106 and a feeding controlling means 109.

Next, the processing procedure performed in the CPU 2 will be described with reference to the flowchart of FIG.

In FIG. 3, first, in step S1, the state of the switch 4 is detected to determine whether or not the loading operation of the battery 1 is completed. That is, if the switch 4 changes from off to on, it is determined that the loading operation of the battery 1 is completed, and the process proceeds to step S2. If the switch 4 remains off, the battery 1
It remains in step S1 until it is determined that the loading operation has been completed and is turned on, and then proceeds to step S2.

In step S2, the position of the lens barrel 8 is determined based on the detection results of the switches 5 and 6, and the process proceeds to step S3. In step S3, it is determined whether the lens barrel 8 is located at any one of a plurality of predetermined positions. The predetermined positions in this embodiment are the re-retraction position, the wide-angle position, and the telephoto position. If the lens barrel 8 is located at any one of the predetermined positions, the process is terminated. If not, the process proceeds to step S4 to move the lens barrel 8 toward any one of the predetermined positions. Step S3
Return to In step S4, the lens barrel 8 is moved so as to be set to the wide-angle position, for example. Hereinafter, the process of step S4 is repeated until it is determined in step S3 that the drive has been performed to the predetermined position, and if step S3 is positive, the process proceeds to step S5.

In step S5, the film winding state is recognized based on the detection result of the phase switch 11, and the process proceeds to step S6. In step S6, it is affirmed whether or not the film winding is completed, that is, whether or not the film is wound up by one frame. When it is determined that the winding is completed, the processing ends,
If it is determined that the winding is not completed, the process proceeds to step S7, the motor 12 is driven to wind the film, and then the process returns to step S6. Hereinafter, the process of step S7 is repeated until it is determined in step S6 that the winding is completed, and then the process ends.

According to the above control, when the lens barrel 8 is stopped at a position other than the predetermined position due to the dropping of the battery 1 while the lens barrel 8 is moving, a new battery 1 is loaded to drive the lens barrel 8 to the predetermined position to form a correct image. The optical system is set. The predetermined position in step S4 is not limited to the wide-angle position but may be the telephoto position or the re-retraction position. Further, in the case of a zoom lens, the re-retraction position is desirable.

With the above control, if the battery drops out while the lens barrel is moving or the film is being wound up, a new battery will be loaded to drive the lens barrel to the specified position, and the film will be secured for one frame. Rolled up. As a result, in addition to the above effects, overlapping exposure is prevented.

F. Effect of the Invention According to the present invention, when the loading operation detecting means detects the completion of battery loading, the position detecting means determines the position of the lens barrel, and the position is different from the predetermined stop position. In this case, since the lens barrel is driven to a predetermined stop position, the lens barrel is driven to the original focus position after the battery is reloaded, and an undesired photograph is taken as in the conventional case. Is prevented. When the loading operation detecting means detects the completion of loading of the battery, the film winding detecting means confirms the film winding state, and if the state is different from the predetermined state, the film is moved to the predetermined state. Since the film is wound up, the film is surely wound up to the specified state after the battery is reloaded, and the inconvenience such as overlapping exposure does not occur. Further, the film winding operation is performed when the lens driving means is in a non-operating state, in other words, the lens driving and the film winding are not performed at the same time after the battery is loaded. This can be prevented.

[Brief description of drawings]

FIG. 1 is a diagram corresponding to claims. 2 and 3 show an embodiment of the present invention, FIG. 2 is a block diagram of a camera, and FIG. 3 is a flowchart showing a processing procedure. 101: shooting lens barrel 102: battery 103: loading operation detecting means 104: position detecting means 105: lens driving means 106: lens barrel driving control means 107: film feeding means 108: film winding detection means 109: feeding control means

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-61-259240 (JP, A) Actually open 63-130747 (JP, U) Actually open 57-150845 (JP, U)

Claims (2)

(57) [Claims] 1. A camera in which a photographing lens barrel is set to a plurality of stop positions by a lens driving means and a film feeding means winds a film of one frame at a time point when photographing of one scene is completed. Loading operation detecting means for detecting the loading operation of the film, position detecting means for detecting the position of the lens barrel of the photographing lens, film winding detecting means for detecting the winding state of the film, and the loading operation detecting means for loading the film. When an operation is detected, the position of the photographing lens barrel is determined from the detection result of the position detection means, and if the position is different from the predetermined stop position, the drive is performed up to the predetermined stop position. When the loading operation is detected by the lens barrel drive control means for controlling the lens driving means and the loading operation detection means, Confirm the winding state of the film from the detection result of the film winding detection means, if the state is different from the pre-specified state, when the lens driving means is in the non-operating state, the film up to the pre-specified state And a feeding control means for controlling the film feeding means so as to wind the film. 2. The feeding control means confirms the winding state of the film in response to the detection of the loading operation by the loading operation detecting means, and when the winding of one frame of the film is not completed. 2. The camera according to claim 1, wherein the film feeding means is controlled so as to wind the film until the winding of one frame is completed.