JPH03154041A - Camera having remote control device - Google Patents

Abstract

PURPOSE:To execute the distance measurement by a photographer himself by providing a light emitting part for emitting an optical signal to an oscillator, and an acoustic wave emitting part for emitting an acoustic wave signal, providing a photodetecting part and an acoustic wave receiving part on a receiver and calculating a time difference of an optical signal and an acoustic wave signal, detecting a distance between a camera and a transmitter, based thereon and operating a focal mechanism. CONSTITUTION:A camera 10 whose power source is turned on is turned to an object to be photographed and placed in a suitable position, an oscillator 22 is removed from an installing part of a main body 11 and by operating an existance confirming switch, the mode is switched to a remote control priority mode. Subsequently, a photographer who becomes an object to be photographed goes in front of the camera and turns the oscillator 22 to the camera 10, turns on a release switch 26 and checks whether the release switch 26 is turned on or not by a microcomputer 18 of the oscillator 22 side. When the switch is turned on, an LED element 25 is allowed to emit light by sending a command signal from the microcomputer 18, and simultaneously, an ultrasonic wave is emitted from an ultrasonic emitter 23, a time difference of an LED light and the ultrasonic wave is calculated by a time difference arithmetic means 28, and a focus lens 12 is focused.

Description

TECHNICAL FIELD The present invention relates to a camera having a remote control device that detects the distance to a transmitter and drives an automatic focusing mechanism based on this distance data.

Furthermore, the present invention relates to a camera having a remote control device that determines whether a subject holding a transmitter is not within the angle of view.

"Prior art and its problems" In general, cameras with an automatic focus mechanism drive the focusing lens to the in-focus position based on distance data detected by a distance measuring device, and then turn on the release switch in this state.
By doing this, you can obtain a focused image.

By the way, when performing self-timer photography using this camera, if you want to measure the distance when there is no subject to focus on at the shooting position, it is best to measure the ground, etc. at the predetermined shooting position. After setting the self-timer, the photographer then goes to this shooting position.

However, when photographing using this method, it is only necessary that the photographer himself/herself can stand accurately at the photographing position measured in advance; however, if this is not the case, the photograph will be out of focus.

``Object of the Invention'' The present invention has been made in view of the above-mentioned conventional problems, and aims to provide a camera with a remote control device that allows a photographer to measure the distance to himself as a subject. The purpose is

A further object of the present invention is to provide a camera with a remote control device that can determine that the subject whose distance is to be measured by holding a transmitter is out of the field of view.

"Summary of the Invention" The present invention, which achieves the above object, is a camera having a remote control device consisting of a receiver provided in a camera body having an automatic focusing mechanism, and a transmitter configured separately from the camera body, A light emitting unit that emits an optical signal and a sonic wave emitting unit that emits a sound wave signal, which are provided in the transmitter; a light receiving unit that receives the optical signal, and a sound wave receiver that receives the sound wave signal, which are provided in the receiver; Time difference calculating means for calculating the time difference between the sound wave signal received by the sound wave receiving section and the optical signal received by the light receiving section; detecting the distance between the camera and the transmitter based on the calculated value, and based on the distance detection data. The present invention is characterized in that it includes: distance measurement control means for driving the automatic focusing mechanism.

The present invention also provides a camera having a remote control device consisting of a receiver provided on a camera body having an automatic focusing mechanism and a transmitter configured separately from the camera body, the camera having a remote control device configured to transmit radio wave signals a radio wave emitting unit that emits a radio wave and a sonic wave emitting unit that emits a sound wave signal; a radio wave receiving unit that receives a radio wave signal and a sonic wave receiving unit that receives a sound wave signal, which are provided in the receiver; a sonic wave signal that the sonic wave receiving unit receives; and a time difference calculation means for calculating the time difference between the signal and the radio wave signal received by the radio wave receiving section; detecting the distance between the camera and the transmitter based on the calculated value, and driving the automatic focusing mechanism based on the distance detection data. It is characterized in that it includes distance measurement control means.

Furthermore, the present invention provides a camera having a photographic lens and an automatic focusing mechanism, and further comprising a remote control device consisting of a receiver provided in the camera body and a transmitter configured separately from the camera body, a light emitting unit that emits an optical signal; a light receiving unit that receives the optical signal; a light receiving unit that is provided in the receiver;
Incident angle detection means for detecting the angle between the optical axis of the photographic lens and the center of the optical signal based on information from the light receiving section; Based on the detection information of the incident angle detection means, whether the transmitter is located at an angle at which photographing is possible with the photographic lens; It is characterized in that it includes an incident angle determining means for determining whether or not the incident angle is determined.

The present invention also provides a camera that has a photographic lens and an automatic focusing mechanism, and further includes a remote control device that includes a receiver provided in the camera body and a transmitter configured separately from the camera body, In addition, a sound wave emitting unit that emits a sound wave signal; two sound wave receiving units that constitute a receiver, which are provided on both sides of the optical axis of the photographing lens at equal distances from the optical axis; and the two sound wave receivers. The present invention is characterized in that it includes an incident angle determining means for determining whether or not the transmitter is located at an angle at which photographing is possible with the photographing lens, based on the output value of the sound wave signal received by each section.

"Embodiment of the Invention" A first embodiment of the present invention will be described below based on the illustrated embodiment. FIG. 2 is a perspective view showing a camera 10 equipped with a receiver of a remote control device according to the present invention and a transmitter 22 of the remote control device, and FIG. 3 is a plan view thereof.

The camera body 11 of the camera 10 has a photographic lens 12, a finder 13, a strobe 15, an AF front light receiver 16, an AF front light emitter 1-7, and a warning LED light emitting section 20. Furthermore, the camera body 11 has an ultrasonic receiving section 19 functioning as a receiver and an LED light D light receiver 1 such as a PSD element.

The transmitter 22 has a release switch 26, and furthermore, an ultrasonic emitter 23 and an LED element 25 are arranged side by side. When this release switch 26 is turned on, the LED light D of the camera body 11 is emitted from the LED element 25.
A distance measurement start signal is output toward the light receiver 1. Based on receiving this distance measurement start signal, the camera side starts distance measurement, and after the distance measurement is completed, automatically performs a release process.

The camera body 11 is formed with a mounting portion (not shown) into which a transmitter 22 is mounted when not in use. This mounting part is equipped with a presence confirmation switch (not shown).
When the transmitter 22 is not attached, this presence confirmation switch is 0F.
F (or ON), and remote control priority mode is set. In this remote control priority mode, switch operations on the transmitter 22 side have priority over switch operations on the camera 10 side.

Referring to FIG. 1, a control system for a remote control device according to this embodiment will be explained.

A microcomputer 18 built into the camera body 11 (
(hereinafter referred to as a microcomputer) has an AF destination light receiver 16, an AF light emitter 7, an ultrasonic receiver 19, and an L
An ED light D light receiver 1 is connected. Further, a drive motor 24 for driving an automatic focusing mechanism, a strobe 15, and a warning LED light emitting section 20 are connected to the output boat. Furthermore, the microcomputer 18 is provided with a time difference calculating means 28, a distance measuring control means 29, an incident angle detecting means 30, an incident angle determining means 52, and an out-of-view angle warning means 31.

The time difference calculation means 28 receives input data when the ultrasonic receiving unit 19 receives the ultrasonic waves from the ultrasonic emitter 23, and L
The input data when the ED light D light receiver 1 receives the LED light from the LED element 25 is taken in, compared and calculated.

The distance measurement control means 29 calculates the distance between the transmitter 22 and the camera 10 based on this calculated value, and controls the lens drive in accordance with this calculated value.

The incident angle detection means 30 detects the optical axis 0 (0
,) and the center of the incident LED light, θ, is the LED
Detection is performed based on information from the light receiving section 21.

The incident angle determining means 52 compares the incident angle data detected by the incident angle detecting means 30 and the photographable angle θ2 (angle of view) of the photographing lens 12, and determines whether the transmitter 22 is within this angle of view. do.

When the angle-of-view determining means 52 determines that the transmitter 22 is not at the photographable angle θ2, the out-of-view angle warning means 31 outputs a signal to the warning LED light emitting unit 20 based on the determination signal. Turn on the light.

Next, the operation of the remote control device of this embodiment will be explained along with the flowcharts of FIGS. 4 and 5.

Turn on the power of the camera 10 and place it at an appropriate position facing the subject. At this time, when the transmitter 22 is removed from the attachment part of the camera body 11, the presence confirmation switch is turned ON (or OFF).
F) The mode is switched to remote control priority mode (step SL).

S2).

Then, the photographer who is the subject goes in front of the camera with the transmitter 22, points the transmitter 22 at the camera 10, and turns on the release switch 26.

Then, the microcomputer on the transmitter 22 side releases the release switch 2.
Check whether or not 6 is turned on (step S3)
.

When it is determined that the release switch 26 has been turned on, an LED light carrying distance measurement start data (for example, 3XIQ'm/s) that instructs the microcomputer 18 to start distance measurement is emitted.
Light is emitted from the element 25, and at the same time ultrasonic waves (for example, 300 m
/s) is emitted from the ultrasonic emitter 23 (step S
4. S5).

Then, on the camera 10 side, the LED light D light receiving 1
When the D light is received, it is assumed that a reference signal to start measurement has been sent, and counting of the time difference is started (step S7.
8). Further, if no LED light is received by the LED light D light receiver 1, this step S7 is repeated.

In step S9, the incident angle detection means 30 detects the position of the center C (center of gravity position) of the incident LED light.

In step SIO, the angle θ1 of the incident angle detection means 3o center 0 with respect to the optical axis o (o+) is calculated.

Furthermore, in step Sll, this angle θ1 is compared with the photographing possible angle θ2 (-A to A).

As a result, if -A<θ,<A are not satisfied, it is assumed that the subject (transmitter 22) is not at a photographable angle, and the error process of step S12 is executed; if the conditions are satisfied, the process proceeds to step S13.

In step S13, it is checked whether the ultrasonic wave receiving section 19 has received an ultrasonic wave. As a result, if the ultrasonic wave is not received, the process proceeds to step S14, and if it is received, the process proceeds to step S15.

In step S15, the count started in step S8 is stopped.

In step S16, the time difference calculation means 28 calculates the time difference between the LED light and the ultrasound obtained in step S7 and step S13.

In step S17, the distance measurement control means 29 calculates the distance between the first transmitter 22 and the camera 1° based on this time difference data, and outputs a signal based on this distance data. This drives the drive motor 24 and operates the focusing lens to bring it into focus (step 318).

When this focusing operation is completed, a release signal is automatically output, and based on this, a release switch (not shown) is turned on and the shutter is released (step 51).
9).

In step S14, it is checked whether a timer for the time when ultrasound is not received has been started. If the timer has not been started, a timer start is executed in step S22, and if it has been started, the process jumps to step S23.

In step S23, it is checked whether or not the time has expired. As a result, if the time has not expired, the process returns to step S13. If the time is up again, step S2
Proceed to step 4.

In step S24, error processing such as issuing a warning with light or sound is executed.

Next, a second embodiment of the remote control device according to the present invention will be described. FIG. 6 is a control block diagram of this remote control device, and FIG. 7 is a plan view schematically showing this remote control device. The camera lO and transmitter 22 of this embodiment are roughly the same as those of the first embodiment described above, but the following parts are different.

That is, in addition to the release switch 26, a ranging start switch 27 is provided as an operation switch for the transmitter 22. Further, on the camera 10 side, an LED light D light receiver 0 consisting of a pin photodiode is installed. Since this pin photodiode has a faster response speed than a PSD element, it is possible to distinguish between the distance measurement start signal that is emitted when the distance measurement start switch 27 is turned on and the release signal that is emitted when the release switch 26 is turned on. Can be done. Further, on both sides of the photographic lens 12, ultrasonic receivers 35, 36 are provided, and these ultrasonic receivers 35, 36 are provided at a distance β to the left and right from the optical axis 0 of the photographic lens 12. There is. The receiving ports of these ultrasonic receivers 35 and 36 are each opened diagonally forward. This camera 10
The microcomputer 32 includes a counter 34, a distance measurement control means 33,
An incident angle determining means 41 and an outside angle of view warning means 42 are provided.

The counter 34 starts counting when the optical signal emitted from the LED element 25 is received by the LED light D light reception 0. Subsequently, the time required for each of the ultrasonic receivers 35 and 36 to receive the ultrasonic waves emitted from the ultrasonic emitter 23 is counted.

The distance measurement control means 33 calculates the average value C of the count values C, , C, of each of the receivers 35 and 36, and calculates the average value C corresponding to the average value C from the distance required for one count value input as distance information in advance. Calculate distance. Then, a signal based on the detected distance value is output to the drive motor 24, and the drive motor 24 is driven to operate the focusing lens to focus.

The incident angle determining means 41 calculates the output ratio X from the respective output values when the ultrasonic receivers 35 and 36 receive the ultrasonic waves emitted from the ultrasonic emitter 23. Then, this output ratio
It is determined whether the transmitter 22 is within this angle of view.

When the angle-of-view determining means 41 determines that the transmitter 22 is not at the photographable angle θ2, the out-of-view angle warning means 42 outputs a signal to the warning LED light emitting unit 20 based on the determination signal. Turn on the light.

This second step follows the flowcharts in Figures 8 and 9.
The operation of the embodiment will be explained.

Turn on the power of the camera 10 and place it at an appropriate position facing the subject (at this time, by removing the transmitter 22 from the attachment part of the camera body 11, the mode is switched to remote control priority mode (step S30, 531) .

The photographer who is the subject moves in front of the camera with the transmitter 22, points the transmitter 22 at the camera 10, and turns on the distance measurement start switch 27. Then, the microcomputer on the transmitter 22 side checks whether it is the release switch 26 or the ranging start switch 27 that has been turned on (step S32,
533).

If it is determined that it is the distance measurement start switch 27 that has been turned on, an LED light carrying distance measurement start data that commands the start of distance measurement is emitted from the LED element 25, and furthermore, the ultrasonic emitter 23 emits ultrasonic waves. A signal is emitted (step S3
4, 37).

On the camera 10 side, when the LED light is received at LED light D light reception 0, the counter 34 starts counting the time difference as a reference signal to start measurement has been sent (step S
35, 36).

Then, in step S38, it is checked whether the ultrasonic receiver 35 has received an ultrasonic wave. As a result, if it has not been received, the process advances to step S40, and if it has been received, the process advances to step S60.

In step S40, it is checked whether the timer has been started. If the timer has not been started, a timer start is executed in step S41, and if it has been started, the process jumps to step S42.

In step S42, it is checked whether or not the time has expired. As a result, if the time has not expired, the process returns to step 338. If the time is up again, step 34
Proceed to step 3. In step 343, error processing such as issuing a warning with light or sound is executed.

In step S60, a count value C1 from the start of counting until the ultrasonic receiver 35 receives ultrasonic waves is detected.

In step S39, it is checked whether or not the ultrasonic receiver 36 has received an ultrasonic wave. If the ultrasonic wave has not been received, the process proceeds to step S45, and if it has been received, the process proceeds to step S61.

In step S45, it is checked whether the timer has been started. If the timer has not been started, a timer start is executed in step S46, and if it has been started, the process jumps to step S47.

In step S47, it is checked whether or not the time has expired. As a result, if the time has not expired, the process returns to step S39. If the time is up again, step S4
Proceed to step 8. In step S48, error processing such as issuing a warning with light or sound is executed.

In step S61, a count value C2 from the start of counting until the ultrasonic receiver 36 receives ultrasonic waves is detected.

In step S49, the output value V of the ultrasonic receiver 35
The output ratio X is calculated from r and the output value V°C of the ultrasonic receiver 36 (X=Vr/V°C).

Then, in step S50, it is checked whether the relationship 1/a<X<a holds true. Figure 7
The range from 1/a to a is the possible shooting angle θ2 (
angle of view). As a result, unless the relationship 1/a < Therefore, error processing is executed in step S52,
Warning LED light emitting unit 2 via viewing angle out-of-range warning means 31
Lights up 0 and issues a warning. Further, if the above relationship is established, the process advances to step S51.

In step S51, the distance measurement control means 33 controls the receiver 35.
．． In step S53, the distance corresponding to the average value C is calculated from the distance corresponding to the one count value inputted in advance as distance information. Furthermore, a signal based on the calculated distance value is output to the drive motor 24, and the drive motor 24 is driven to operate the focusing lens to focus (step 554).

Thereafter, the microcomputer 32 checks whether a release signal is input (step 555).

Then, in step S56, the release switch 26
is turned on, and the LED light carrying the release data is turned on.
When the light is emitted from the element 25, a release process is executed in step S56, and the shutter is released.

In the second embodiment described above, the release switch 26 and the distance measurement start switch 27 are provided separately, but the distance measurement start switch 27 is operated by pressing the single switch (one step or half press) as in a normal camera. It is also possible to operate the release switch 26 by pressing the button twice and then fully pressing it.

Further, by pressing a single switch, the distance measurement start switch 27 function and the release switch 26 function may be automatically activated.

FIG. 10 is a flowchart showing this third embodiment. In this case, the operations corresponding to step 3338 and step S56 described in the flowchart of FIG. 9 are omitted. In other words, since it is a single switch, ON
There is no need to check whether it is the ranging start switch 27 that has been activated, and the release switch 26 must first be turned on.
Since the camera is automatically released after focusing, there is no need to send release data. This automatic release operation eliminates the need for the operation (judgment) corresponding to step S55 in FIG. 8.

Therefore, when using this remote control device, the transmitter 2
2 toward the camera lO, press the release switch 26 (
Or, when the distance measurement start switch 27) is turned on, the transmitter 22
The microcomputer on the side checks whether the release switch 26 has been turned on (step 557). As a result, an LED light carrying distance measurement start data is emitted from the LED element 25, and at the same time, an ultrasonic wave is emitted from the ultrasonic emitter 23 (step S58.59).

Subsequently, the operation is similar to the flowchart of FIG. 8 showing the second embodiment, and after the focusing lens is focused based on the distance measurement data, the shutter is automatically released.

Next, a third embodiment of the remote control device according to the present invention will be described. FIG. 11 is a control block diagram of this remote control device. The structures of the camera 10 and transmitter 22 of this embodiment are roughly the same as those of the first embodiment described above, but the following parts are different.

That is, in the first embodiment, the arrival time of the ultrasonic signal emitted from the transmitter 22 and the optical signal to the camera 10 was compared, and the distance was measured based on the time difference, but the third embodiment Then, the arrival times of the ultrasonic signal emitted from the transmitter 22 and the radio wave signal are compared, and the distance is measured based on the time difference.

Therefore, the transmitter 22 is provided with a radio wave emitter 45 instead of the LED element 25, and the camera body 11 is provided with a radio wave receiving section 46 that receives the radio signal emitted from the radio wave emitting section 45.

Furthermore, a microcomputer 44 mounted on the camera 10 includes a time difference calculation means 47, a distance measurement control means 48, and an incident angle detection means 49.
, an incident angle determining means 50 and an out-of-view angle warning means 51 are provided.

The time difference calculating means 47 is configured so that the radio wave receiving section 46 is connected to the radio wave transmitter 4.
5 and the input data when the ultrasonic receiver 19 receives the ultrasonic signal from the ultrasonic transmitter 23, and compare and calculate the input data.

The distance measurement control means 48 calculates the distance between the transmitter 22 and the camera 10 based on this calculated value, and controls the lens drive in accordance with this calculated value.

The incident angle detecting means 49 detects the angle between the optical axis of the photographing lens 12 and the radio signal based on information from the radio wave receiving section 46 .

The incident angle determining means 50 compares the detection data of the incident angle detecting means 49 with the photographable angle (angle of view) of the photographic lens 12, and determines whether the transmitter 22 is within this angle of view.

The viewing angle out-of-range warning means 51 detects when the incident angle determining means 50 determines that the transmitter 22 is not at a photographable angle.
Based on the discrimination signal, a signal is output to the warning LED light emitting section 20 to turn it on.

Therefore, when using this remote control device, the transmitter 22
While pointing the camera at the camera 10, turn the release switch 26 to O.
When the microcomputer on the transmitter 22 side checks that the release switch 26 has been turned on. This results in
A radio wave signal carrying distance measurement start data is sent to the radio wave emitter 45.
At the same time, an ultrasonic signal is emitted from the ultrasonic emitter 23.

The subsequent operation is substantially the same as that in the first embodiment, but in calculating the distance measurement data, the time difference calculation means 47 uses the input data when receiving the radio signal from the radio wave emitting unit 45 and the ultrasonic wave. The input data when receiving the ultrasonic signal from the emitter 23 is taken in, compared and calculated.

Then, based on the calculated distance data, the distance measurement control means 4
After 8 focuses the focusing lens, the shutter is automatically released.

"Effects of the Invention" As described above, the camera having the remote control device according to claim 1 of the present invention detects the distance to the transmitter based on calculating the time difference between the arrival times of the acoustic signal and the optical signal. By simply pointing the transmitter at the camera and performing simple operations, a photographer holding the transmitter can easily measure the distance to himself or herself and focus. Therefore, even when not in front of the camera, the photographer can accurately measure the distance of himself, for example with a mountain in the background,
Even when shooting from a position offset from the front of the camera,
You can reliably focus on yourself when taking pictures.

Furthermore, since the distance to the transmitter is measured based on the signal emitted directly from the transmitter toward the camera, there are no problems such as loss of reflected distance measurement light that occurs when measuring distance using conventional active methods, for example. (, distance measurement accuracy can be improved.

Further, since the camera having the remote control device according to claim 2 can detect the distance to the transmitter based on calculating the time difference between the arrival times of the radio wave signal and the sound wave signal, the camera having the remote control device according to claim 1 can detect the distance to the transmitter. It is possible to obtain the same effect as a camera with a remote control device.

Furthermore, the camera having the remote control device according to claim 3 can determine whether or not the transmitter is at an angle where photography is possible, based on the optical signal projected from the transmitter.
For example, if a warning is issued based on this discrimination data, a photographer who is holding a transmitter and trying to take a picture of himself will be warned.
It is possible to notify that the camera is within the photographable angle and that it is out of the maximum shadow angle.

The camera having the remote control device according to claim 4 is capable of determining whether or not the transmitter is located at an angle where photography is possible, based on the output values of the sound wave signals respectively received by the two sound wave receivers. Therefore, the same effect as the camera having the remote control device according to claim 3 can be obtained.

[Brief explanation of the drawing]

FIG. 1 shows a camera having a remote control device according to the present invention.
A control block diagram showing the first embodiment, Fig. 2 is a perspective view showing a camera equipped with a receiver and a transmitter, Fig. 3 is a plan view of Fig. 2, and Fig. 4 is a view of the camera body side. FIG. 5 is a flowchart showing the operation on the transmitter side of the remote control device; FIG. 6 is a second embodiment of the camera having the remote control device according to the present invention. FIG. 7 is a control block diagram showing the second
FIG. 8 is a flowchart showing the control operation on the camera body side, FIG. 9 is a flowchart showing the operation on the transmitter side, and FIG. 10 is a plan view showing the camera and receiver in the embodiment. FIG. 11 is a control block diagram showing a third embodiment of a camera having a remote control device according to the present invention. 10...Camera, 11...Camera body, 12...
Photographic lens, 18, 32. 44... Microcomputer, 19... Ultrasonic receiver (sound wave receiver), 21.
... LED light receiving section (light receiving section), 22 ... transmitter, 2
3... Ultrasonic emitter (sonic wave emitting part), 24... Drive motor, 25... LED element (light emitting part), 28.47
. . . Time difference calculation means, 29.33.48 . . . Distance measurement control means, 30.49 . . . Incident angle detection means, 34.
Counter, 35. 36... Ultrasonic receiver (sound wave receiving section), 40... LED light receiving section, 45... Radio wave emitter (radio wave emitting section), 46... Radio wave receiving section, 50. 52・
...Incidence angle determination means, C...Center of incident light, C,
, C, . . . count value, i . . . distance, 0.0.・・・
・Optical axis, θ1... Angle with the center, θ2... Shooting possible angle, vp, Vr... Output value, X... Output ratio.

Claims (4)

[Claims] (1) A camera having a remote control device consisting of a receiver provided in the camera body having an automatic focusing mechanism and a transmitter configured separately from the camera body, the transmitter being provided in the transmitter to emit an optical signal. a light emitting section that emits light and a sound wave emitting section that emits a sound wave signal; a light receiving section that receives a light signal and a sound wave receiving section that receives a sound wave signal, both of which are provided in the receiver; time difference calculating means for calculating the time difference between the optical signal received by the part; detecting the distance between the camera and the transmitter based on the calculated value;
A camera having a remote control device, comprising: distance measurement control means for driving the automatic focusing mechanism based on the distance detection data. (2) A camera having a remote control device consisting of a receiver provided on the camera body having an automatic focusing mechanism and a transmitter configured separately from the camera body, the camera having a remote control device that emits a radio wave signal provided in the transmitter. a radio wave emitting unit for emitting a radio wave signal and a sonic wave emitting unit for emitting a sonic signal; a radio wave receiving unit for receiving a radio wave signal and a sonic wave receiving unit for receiving a sound wave signal, which are provided in the receiver; a sonic wave signal received by the sonic wave receiving unit; time difference calculating means for calculating the time difference between the radio wave signal received by the radio wave receiving section; detecting the distance between the camera and the transmitter based on the calculated value;
A camera having a remote control device, comprising: distance measurement control means for driving the automatic focusing mechanism based on the distance detection data. (3) A camera that has a photographic lens and an automatic focus mechanism, and further has a remote control device consisting of a receiver installed in the camera body and a transmitter configured separately from the camera body, the camera having a remote control device installed in the transmitter. , a light emitting unit that emits an optical signal; a light receiving unit provided in the receiver that receives the optical signal; an incident angle detection means that detects the angle between the optical axis of the photographic lens and the center of the optical signal based on information from the light receiving unit; A camera having a remote control device, comprising: an incident angle determining means for determining whether or not a transmitter is located at an angle at which photographing is possible with the photographing lens based on detection information of the incident angle detecting means. (4) A camera having a photographic lens and an automatic focusing mechanism, and further having a remote control device consisting of a receiver provided in the camera body and a transmitter configured separately from the camera body, the camera having a remote control device provided in the transmitter, a sound wave emitting unit that emits a sound wave signal; two sound wave receiving units forming a receiver, each provided on both sides of the optical axis of the photographic lens and spaced apart from the optical axis by the same distance; each of the two sound wave receiving units A camera having a remote control device, comprising: an incident angle determining means for determining whether or not a transmitter is located at an angle at which photographing is possible with the photographing lens, based on an output value of a sound wave signal received by the camera.