JPH05127239A - Winding-up device for camera - Google Patents

Abstract

PURPOSE:To reduce the feeding noise of a film when a speed light is used, to quickly charge the speed light at a consecutive photographing time and to eliminate complexity in the selection of a film feeding mode. CONSTITUTION:A film feeding device 106 for automatically winding up the film, a film feeding control means 105 which controls the feeding speed of the film, a speed light emission detection means 103 which outputs a detection signal in response to the light emitting action or the light emission preparing action of a speed light device 104 and the feeding control means 105 which commands the film feeding means to feed the film at a low speed when the detection signal is received from the detection means 103 are provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film winding apparatus for controlling a film feeding speed when a speedlight is used.

[0002]

2. Description of the Related Art Conventionally, in a camera having a film feeding device for automatically winding a film, the film automatic winding speed, that is, the film feeding speed is constant, and when a speedlight for illuminating a subject emits light. And the film feeding speed at the time of non-emission was the same. Moreover, the feeding speed was set to be as high as possible in order to quickly respond to the next shooting.

[0003]

The conventional camera as described above has the following problems. That is, the speedlight is mainly used for shooting at night or indoors, but at that time, the film is wound up at a high speed, so that the feeding sound becomes loud and annoy the surroundings.

Further, during continuous shooting, if the light emission amount of the speedlight increases, it takes time to charge for the next light emission, which may hinder the shooting of the next frame.

Further, although a camera capable of selecting the film feeding speed to either a high speed mode or a low speed mode has been proposed, it has been pointed out that the mode selection may be erroneous and the mode selection itself is complicated. There is.

Therefore, a first object of the present invention is to reduce the film feeding sound when a speedlight is used.
A second object of the present invention is to secure the charge time of the speedlight during continuous shooting. Further, a third object of the present invention is to eliminate the complexity of selecting a film feeding mode.

[0007]

In order to solve the above problems, a film winding apparatus according to the present invention controls a film feeding device (106) for automatically winding a film and a film feeding speed. Film feeding control means (10
5), a speedlight emission detection means (103) for outputting a detection signal in response to a light emission operation or a light emission preparation operation of the speedlight device, and to the film feeding means when the detection signal is received from the light emission detection means. A feeding control means (10) for instructing the film feeding to be slow feeding.
1, S2).

The hoisting device for a camera according to the present invention is
A film feeding device (106) for automatically winding a film, a film feeding control means (105) for controlling the film feeding speed, a photometric means (107) for measuring the light quantity of the object field, and the photometry. And a feeding control means (101, S12) for instructing the film feeding means to slow down the film feeding when a signal indicating that the light amount is determined to be less than or equal to a predetermined value is received from the means. It is as a configuration.

In these cases, when the charge state of the speedlight device after light emission is observed and it is detected that the speedlight device has been charged, the charge state detection is instructed to the film feeding control means. Means (1
08), and the film feeding control means may be configured to instruct the film feeding means to set the film feeding to high speed feeding based on the instruction (S25). ..

[0010]

According to the present invention, when the detection signal from the speedlight emission detection means is received, the feeding control means instructs the film feeding means to set the film feeding to the low speed feeding. Therefore, the film feeding speed becomes low, the feeding noise is reduced, and the charging time of the speedlight device can be secured.

Further, when a signal indicating that the amount of light is less than or equal to a predetermined value is received from the photometry means, the feeding control means instructs the film feeding means to set the film feeding to the low speed feeding. At night or when shooting indoors when the surroundings are dark,
The film feeding speed automatically becomes low, the feeding noise is reduced, and the charging time of the speedlight device can be secured.

Further, by providing a charge state detecting means for detecting the charge state of the speedlight device and for instructing the film feeding means to set the film feeding to high speed feeding when the charging of the speedlight device is completed, It is possible to speed up the film winding while preventing the charge delay of the speedlight device.

[0013]

EXAMPLES The present invention will be described in more detail based on the following examples. 1 is a block diagram showing an embodiment of a hoisting device for a camera according to the present invention, FIG. 2 is a diagram showing an embodiment of the processing procedure of the arithmetic circuit of FIG. 1, and FIG. 3 is another processing procedure of the arithmetic circuit of FIG. FIG. 4 is a diagram showing another embodiment of the processing procedure of the arithmetic circuit of FIG.

In FIG. 1, a release button 102 is a button for performing a standby operation or a shooting start operation of the camera by its half-press or full-press operation, and transmits its instruction signal to the arithmetic circuit 101. The speedlight 104 is a light emitting device built in the camera body or externally attached as an accessory. The speedlight emission detection means 103 is means for electrically or optically detecting the light emission operation of the speedlight 104, and transmits the result to the arithmetic circuit 101. The speedlight emission detection unit 103 may detect the charging completion of the speedlight 104 before light emission, that is, the light emission preparation operation.

The photometric means 107 is means for measuring the amount of light in the object field, and transmits the result to the arithmetic circuit 101.
The charge state detection means 108 is the speedlight 104.
Is a means for detecting the state of charge after the light emission of
The result is transmitted to the arithmetic circuit 101.

The film feeding control means 105 is a means for controlling the rotation of a film feeding motor (not shown) of the film feeding device 106 and its speed based on the calculation result of the calculation circuit 101. The film feeding device 106 is a device that feeds and winds the film by the film feeding motor according to a command from the film feeding control means 105.

FIG. 2 shows an example of the processing procedure of the arithmetic circuit 101 shown in FIG. 1. In particular, in the case of controlling the film feeding speed by detecting the light emission of the speedlight 104 by the speedlight light emission detecting means 103. The processing procedure is shown.

In S1, when the release button 102 releases the shutter, the process proceeds to S2. In S2, the light emission of the speedlight 104 is observed by the speedlight light emission detection means 103, and if light emission is detected, the process proceeds to S3, and if not detected, the process proceeds to S4.

When light emission is detected, that is, in S3, the film feeding device 106 is operated at a low speed based on the command of the film feeding control means 105, and the film is fed at a low speed. This low-speed operation can be performed by duty-driving the feeding motor, using a mechanical speed reducer, or the like.

If no light emission is detected, that is, in S4,
The film is fed in the preset film feeding mode. The film feeding mode means changing the film feeding speed.

Next, the processing procedure shown in FIG. 3 will be described. FIG. 3 shows an example of the processing procedure of the arithmetic circuit 101 of FIG. 1, but there is a difference in that the film feeding speed is controlled by the brightness of the surroundings as described below.

In step S11, when the release button 102 is pressed to release, the process proceeds to step S12. In S12, the light amount of the subject is measured by the photometric means 107, and if the darkness of the surroundings is equal to or greater than a preset value, the process proceeds to S13, and if not, the process proceeds to S14. In S13 and S14, the same processes as S3 and S4 in FIG. 2 are performed, respectively.

Next, the processing procedure shown in FIG. 4 will be described. FIG. 4 shows an example of the processing procedure of the arithmetic circuit 101 of FIG. 1, but as described below, the speedlight 10
There is a difference in that the film feeding speed can be controlled depending on the charge state after light emission of No. 4.

In S21, when the release button 102 presses the release button, the process proceeds to S22. In S22, the light emission of the speedlight 104 is observed by the speedlight light emission detection means 103, and if light emission is detected, S2
3, the process proceeds to S24 if not detected.

When the light emission is detected, in S23, the film feeding device 106 is operated at a low speed based on the command of the film feeding control means 105, and the film is fed at a low speed. This low-speed operation can be performed by duty-driving the feeding motor as described above or by using a mechanical speed reducer or the like.

If no light emission is detected in S22, S2
In 4, the film is fed in the preset film feeding mode until the completion of the film feeding is detected in the next step S27. If completion is detected, this flow ends.

In S25, the charge state of the speedlight 104 is observed by the charge detection means 108. If the charge is sufficient, the process proceeds to S24, and the film is fed in the preset film feeding mode. .. On the other hand, if the charge is insufficient, the program of S23 to S27 is repeated until the completion of the film feeding is detected in S26.

According to the processing procedure shown in FIG. 4, when the charging state of the speedlight is detected and the charging is completed,
Since the film feeding is switched from low speed to high speed, it is possible to speed up the film winding while preventing the charge delay of the speedlight device.

[0029]

As described above in detail, according to the present invention, the film feeding immediately after the flashing of the speedlight is automatically switched to the low-speed feeding at the time of shooting using the speedlight at night, indoors, etc. It is possible to reduce the noise and perform quiet shooting without disturbing the surroundings.

Further, according to the present invention, during continuous shooting using a speedlight, for example, normal continuous shooting or continuous shooting during auto-bracketing, the film is fed at a low speed so that the speedlight for the next light emission can be obtained. The charge time can be secured. In particular, auto bracketing is effective because it continuously shoots at least 3 frames.

Further, since the film feeding speed is automatically changed, the photographer does not have to set the feeding speed.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a hoisting device for a camera according to the present invention.

FIG. 2 is a diagram showing an example of a processing procedure of the arithmetic circuit of FIG.

FIG. 3 is a diagram showing another example of the processing procedure of the arithmetic circuit of FIG.

FIG. 4 is a diagram showing still another example of the processing procedure of the arithmetic circuit of FIG.

[Explanation of symbols]

 101 arithmetic circuit 102 release button 103 speedlight emission detection means 104 speedlight 105 film feeding control means 106 film feeding device 107 photometric means 108 charge state detection means

Claims (3)

[Claims] 1. A film feeding device for automatically winding a film, a film feeding control means for controlling a film feeding speed, and a detection signal output in response to a light emission operation or a light emission preparation operation of a speedlight device. Speed light emission detection means, and a feed control means for instructing the film feed means to feed the film at a low speed when a detection signal is received from the light emission detection means. Hoisting device for camera. 2. A film feeding device for automatically winding a film, a film feeding control means for controlling a film feeding speed, and a photometric means for measuring a light quantity of a field.
And a feeding control means for instructing the film feeding means to set the film feeding to a low speed feeding when receiving a signal from the photometric means to the effect that the light amount is determined to be a predetermined value or less. A characteristic hoisting device for cameras. 3. When the charge state of the speedlight device after light emission is observed and it is detected that the charge of the speedlight device is completed, a charge state detection means for instructing the film feed control means is provided. 3. The camera according to claim 1, wherein the film feeding control unit instructs the film feeding unit to set the film feeding to high speed feeding based on the command. Hoisting device.