JPH0228630A - Remote controller for camera - Google Patents

Abstract

PURPOSE:To surely operate releasing by inputting a transmission signal from a remote control transmitter, generating a release signal and providing a holding circuit which holds such signal and a reset circuit which resets the holding conditions of the holding circuit by a shutter operation signal. CONSTITUTION:A latch circuit 13 latches the output leading edge of a decoder 12, and the release signal 4 to a camera control part 15 is held. When the release signal 4 comes and the shutter is released, the shutter operation signal 6 is output, and the latch circuit 13 is reset by such signal. When the shutter operation signal 6 does not come back, and when a timer 17 counts the previously decided time, the output 18 is output, the latch circuit 13 is reset, and a display circuit 20 is operated. Then, the title controller informs to a remote controller operator that the controller has received the transmission signal but the shutter is not released. Thus, the operation of the camera is fed back to the remote controlled receiver, and the release signal is efficiently and surely outputted.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a camera remote control that ensures reliable release operation.

[Prior Art] Conventionally, a camera remote control system is as shown in Fig. 5.
Transmission signal 2 from remote control transmitter 1 is sent to remote control receiver 3
A release signal 4 is transmitted from the remote control receiver 3 to the camera 5 by hand, and the signal flow is only in one direction. When you release the camera using the remote control, the camera performs photometering and distance measurement before releasing the camera.
The release signal from the remote control receiver 3 must be held for a certain period of time or more.

In a conventional remote control, when receiving a command signal from the transmitter 1, the receiver 3 either holds the release signal to the camera for a predetermined period of time in one shot, or releases the command signal from the transmitter 1 while pressing the command key on the remote control transmitter 1. The receiver 3 held the release signal to the camera while receiving the signal from the transmitter 1.

On the other hand, with a camera that has a function that automatically starts flash photography in a dark place, even if you press the camera's release button when flash photography starts automatically, the shutter will not release until the strobe's main capacitor is fully charged. Many of them are designed not to be released. In this case, the time it takes to complete charging is determined by the state of the main capacitor and battery, and is not always a constant value. Generally it takes about 5 seconds, a fast one takes about 2 seconds, and one in bad condition takes 10 seconds.
It may take more than a second.

Therefore, even if you try to release such a camera using the remote control receiver 3 that sends the release signal to the camera in one shot as described above, if it automatically starts flash shooting, the charging time of the main capacitor of the flash will take a while. If the duration is longer than the shot release signal retention time, the shutter will not release. In other words, even though the signal is certainly reaching the receiver 3 from the remote control transmitter 1, the shutter does not operate.

On the other hand, in the remote control receiver 3 which holds the release signal to the camera while the receiver 3 receives continuous signals from the transmitter 1, the remote control operator can release the shutter while looking at the camera. By continuing to press the command key of the transmitter 1 and sending command signals until the shutter is released, the shutter can be reliably released.

However, when the camera automatically starts flash photography, if the release signal is kept from the receiver 3 to the camera, the shutter will be released when the strobe's main capacitor is fully charged, but the shutter will be released until the charging is complete. Since the time is unknown, the remote control operator must hold down the command key on the remote control transmitter 1 and wait patiently for several seconds until the shutter is released, which is more inconvenient than using a self-timer.

Therefore, if you use a conventional remote control to release a camera where the predetermined time required to release the shutter changes depending on the situation at the time, the operability will be very poor or the shutter may not be released. There was a fear that

[Object of the Invention] The present invention has been made in view of the above circumstances, and includes an input circuit that generates a release signal by inputting a transmission signal from a remote control transmitter, and a release signal that is output from the input circuit. An object of the present invention is to provide a camera remote control that ensures the release operation of a camera by including a holding circuit and a reset circuit that resets the holding state of the holding circuit using a shutter operation signal.

[Example〕 An embodiment of the present invention will be described below with reference to the drawings.

Figure 1 schematically shows the remote control system.
Parts that are the same as those in the figures are given the same reference numerals.

1 is a remote control transmitter, 2 is a transmission signal, 3 is a remote control receiver, 4 is a release signal, 6 is a shutter operation signal, and 5 is a camera body. As the medium of the second transmission signal, sound waves,
Possible sources include ultrasound, radio waves, and light. The difference from the conventional one shown in FIG. 5 is that a shutter operation signal 6 is sent from the camera 5 to the remote control receiver 3.

FIG. 2 shows the remote control receiver 3 shown in FIG. 1, where 11 is a preamplifier, 12 is a decoder that decodes the command of the transmitted signal, 13 is a latch circuit that holds the output of the decoder, 4 is a release signal, 15 is a camera control unit, 6 is a shutter operation signal, which is connected to one input of an OR gate 16, and the other is connected to an output 18 of a timer 17. The output 19 of the OR gate 16 is the latch circuit 13
This is the signal to reset the . 20 is a display circuit, which is operated by the output 18 of the timer.

Next, the operation of the above configuration will be explained. A transmission signal from a remote control transmitter (not shown) is amplified by a preamplifier 11 and decoded by a decoder 12. This is because the remote control normally transmits signals in various forms to prevent disturbance noise and malfunction with other remote controls, and the receiving side must select one of them.

The latch circuit 13 latches the rising edge of the output of the decoder 12 shown in FIG. 3(a), and holds the release signal 4 sent to the camera control section 15 as shown in FIG. 3(b). When the release (No. 3 4) comes and the shutter is released, the shutter operation signal 6 shown in FIG. 3 (C) is output, and this signal resets the latch circuit 13. The case is shown in Figure 3.

On the other hand, when the release signal 4 is output, the timer 17 starts operating as shown in FIG. 4(e).

When the shutter operation signal 6 returns, the latch circuit 13 is reset and the release signal is no longer output, so the timer 17 also returns to its original state. When the specified time comes, the output 18 is outputted as shown in FIG. 4(f), and the latch circuit 13 is reset. Further, the display circuit 20 is operated as shown in FIG. 4(g) based on the timer output 18. Display circuit 2
If the 0 display element is based on light, for example, a light emitting diode or the like is attached to the entire surface of the remote control receiver to inform the remote control operator that the transmitted signal has been received but the shutter has not been released.

In the above embodiment, it is assumed that the remote control receiver and the camera are connected separately, but a circuit as shown in FIG. 2 may be incorporated inside the camera body. In that case, the display circuit may be one that is present in the camera, such as a self-timer display circuit.

As described in detail above, according to the present invention, by obtaining the shutter operation signal from the camera side, that is, by feeding back the camera operation to the Risocon receiver, it is possible to output the release signal efficiently and reliably. can.

Furthermore, by providing a timer and a display device, even if the predetermined time required for shutter release, such as the time required for photometry or distance measurement, changes, the operability will not deteriorate. This is a fully automatic camera with a built-in strobe, and it is not only a camera that automatically uses strobe photography in dark places, but also an eye reflex camera that uses pudge-even autofocus, and depending on the contrast of the subject, it may find the focal point. It is also effective when remotely controlling a camera that cannot be accessed using a remote control.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a camera remote control showing an embodiment of the present invention, FIG. 2 is a detailed diagram of the remote control receiver shown in FIG. 1,
3 is a time chart of each part of FIG. 2 during shutter operation, FIG. 4 is a time chart of each part of FIG. 2 during shutter release operation, and FIG. 5 is a schematic diagram of a conventional camera remote control. DESCRIPTION OF SYMBOLS 1... Remote control transmitter, 3... Remote control receiver, 11... Preamplifier, 12... Decoder, 13... Latch circuit, 15... Camera control part, 17... Timer, 20 ...Display circuit.

Claims (1)

[Claims] An input circuit that generates a release signal by inputting a transmission signal from a remote control transmitter, a holding circuit that holds the release signal output from the input circuit, and a holding state of the holding circuit that is reset by a shutter operation signal. A camera remote control characterized by comprising a reset circuit.