JP2880738B2 - Camera with remote control device - Google Patents

Description

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

Further, the present invention relates to a camera having a remote control device for determining that a subject having a transmitter is not within an angle of view.

"Prior art and its problems" Generally, a camera having an automatic focusing mechanism drives a focusing lens to a focusing position based on distance data detected by a distance device, and turns on a release switch in this state.
By doing so, a focused image is obtained.

By the way, when performing self-timer shooting using this camera, when performing distance measurement in a state where there is no subject to be focused on at the shooting position, measure the ground or the like at a predetermined shooting position. The self-timer was set, and the photographer was then going to this position.

However, in the case of photographing by this method, it is sufficient that the photographer himself can stand exactly at the photographing position measured in advance, but otherwise, the photograph is out of focus.

[Object of the Invention] The present invention has been made in view of the above-described conventional problems, and has an object to obtain a camera having a remote control device that allows a photographer to measure a distance of himself / herself as a subject. The purpose is.

Furthermore, the present invention can determine that the subject whose distance is to be measured with the receiver is out of the angle of view,
It is intended to obtain a camera having a remote control device.

[Summary of the Invention] The invention according to claim 1, which achieves the above object, comprises a photographing lens and an automatic focusing mechanism, a receiver provided on a camera body, and a transmitter configured separately from the camera body. A light-emitting unit that emits an optical signal and a sound-wave emitting unit that emits a sound signal provided in a receiver; a light-receiving unit that receives an optical signal, provided in the receiver; Two sound wave receiving units provided on both sides of the optical axis of the photographing lens at equal distances from the optical axis; based on output values of sound wave signals respectively received by the two sound wave receiving units, the photographing lens Incident angle discriminating means for discriminating whether or not the transmitter is within the photographable angle of the camera; time difference calculating means for calculating a time difference between a sound wave signal received by the sound wave receiving unit and a light signal received by the light receiving unit; Based on the calculated value Distance measuring means for detecting the distance between the camera and the transmitter, and driving the automatic focusing mechanism based on the distance detection data; and the time calculating means and the distance measuring control means comprise: the incident angle discriminating means. However, it is characterized in that the above calculation and driving are executed on condition that it is determined that the transmitter is within the photographable angle of the photographing lens.

The present invention is also directed to a camera having a receiver provided on a camera body having an autofocus mechanism and a remote control device comprising a receiver formed separately from the camera body, wherein a radio signal provided on a transmitter is provided. A radio wave emitting unit that emits a sound wave and a sound wave emitting unit that emits a sound wave signal; provided in a receiver;
A radio wave receiving unit for receiving a radio wave signal and a sound wave receiving unit for receiving a sound wave signal; time difference calculating means for calculating a time difference between a sound wave signal received by the sound wave receiving unit and a radio wave signal received by the radio wave reception; Distance measuring means for detecting the distance between the camera and the transmitter based on the distance detection data and driving the automatic focusing mechanism based on the distance detection data.

The present invention further provides a camera having a photographing lens and an automatic focusing mechanism, and further including a receiver provided on the camera main body and a remote control device including a transmitter configured separately from the camera main body. A light emitting unit for projecting an optical signal; a light receiving unit for receiving an optical signal provided in a receiver; an incident angle detection for detecting an angle between an optical axis of a photographing lens and a center of the optical signal based on information of the light receiving unit. Means; an incident angle determining means for determining whether or not a transmitter is located at a photographable angle of the photographing lens based on detection information of the incident angle detecting means;
It is characterized by having.

The present invention is directed to a camera having a photographing lens and an automatic focusing mechanism, and further including a receiver provided in the camera body and a remote control device including a receiver formed separately from the camera body, provided in the transmitter. A sound wave emitting unit that emits a sound wave signal; two sound wave receiving units constituting a receiver provided on both sides of an optical axis of the photographing lens at equal distances from the optical axis; Is characterized by including an incident angle determining means for determining whether or not the transmitter is located at the photographable angle of the photographing lens based on the output value of the received sound wave signal.

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

The camera body 11 of the camera 10 has a photographing lens 12, a finder 13, a strobe 15, an AF light receiving unit 16, an AF light projecting unit 17, and a warning LED light emitting unit 20. Further camera body 11
Has an ultrasonic receiving section 19 functioning as a receiver and an LED light receiving section 21 such as a PSD element.

The transmitter 22 has a release switch 26, and furthermore, an ultrasonic transmitter 23 and an LED element 25 are arranged side by side. When the release switch 26 is turned ON, a distance measurement start signal is output from the LED element 25 to the LED light receiving section 21 of the camera body 11. Based on the reception of the distance measurement start signal, the camera starts distance measurement, and automatically performs release processing after the distance measurement is completed.

The camera body 11 has a mounting portion (not shown) for mounting the transmitter 22 when not in use. This attachment portion is provided with a presence / absence confirmation switch (not shown). When the transmitter 22 is not attached, the presence / absence confirmation switch is turned off (or turned on), and the remote control priority mode is set. In the remote control priority mode, a switch operation on the transmitter 22 has priority over a switch operation on the camera 10.

With reference to FIG. 1, a control system of the remote controller of the present embodiment will be described.

A microcomputer 18 (hereinafter referred to as “microcomputer”) built into the camera body 11 has an AF light receiving unit 1
6, AF light emitter 17, ultrasonic receiver 19 and LED light receiver 21
Is connected. A drive motor 24 for driving the automatic focusing mechanism, a strobe 15, and a warning LED light emitting unit 20 are connected to the output port. Further, 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 discriminating means 52 and an out-of-view-range warning means 31.

The time difference calculating unit 28 is configured such that the ultrasonic receiving unit 19
The input data when receiving the ultrasonic wave from 23 and the input data when the LED light receiving unit 21 receives the LED light from the LED element 25 are fetched, compared and calculated.

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

The incident angle detecting means 30 detects the angle θ ₁ between the optical axis o (o ₁ ) of the taking lens 12 and the center c of the incident LED light based on the information of the LED light receiving section 21.

The incident angle determining means 52 compares the detected incident angle data of the incident angle detecting means 30 with the photographable angle θ ₂ (angle of view) of the photographing lens 12 to determine whether or not the transmitter 22 is within this angle of view. Determine.

The out-of-angle range warning unit 31 is provided by the incident angle determination unit 52.
When transmitter 22 is determined to not to photographable angle theta _2,
Based on the discrimination signal, a signal is output to the warning LED light-emitting unit 20 to light it.

Next, the operation of the remote controller of the present embodiment will be described with reference to the flowcharts of FIGS.

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 detached from the mounting portion of the camera body 11, the presence / absence confirmation switch is turned ON (or OFF) and the mode is switched to the remote control priority mode (steps S1 and S2).

Then, the photographer who becomes the subject goes forward of the camera with the transmitter 22, turns the transmitter 22 toward the camera 10, and turns on the release switch 26. Then, the microcomputer on the transmitter 22 side,
It is checked whether or not the release switch 26 has been turned on (step S3).

If it is determined that the release switch 26 has been turned ON, an LED light (for example, 3 × 10 ⁸ m / s) is emitted from the LED element 25 on which distance measurement start data for instructing the microcomputer 18 to start distance measurement is emitted.
At the same time, an ultrasonic wave (for example, 300 m / s) is emitted from the ultrasonic emitter 23 (Steps S4 and S5).

Then, when the LED light receiving section 21 receives the LED light on the camera 10, the counting of the time difference is started assuming that the measurement start reference signal has been sent (steps S7, S8). Also LED
If LED light is not received by the light receiving section 21, this step S
Repeat 7.

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

In step S10, the incident angle detecting means 30 calculates the angle θ ₁ of the center c with respect to the optical axis o (o ₁ ).

Further, in step S11, the angle theta _1, compared photographable angle theta ₂ and (-A~A). As a result, if −A <θ ₁ <A is not satisfied, it is determined that the subject (transmitter 22) is not at the photographable angle, and the error process of step S12 is executed. If the condition is satisfied, the process proceeds to step S13.

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

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

In step S16, the time difference calculating means 28
And the time difference between the LED light obtained in step S13 and the ultrasonic wave is calculated.

In step S17, the distance measurement control unit 29 calculates the distance between the transmitter 22 and the camera 10 based on the time difference data,
A signal is output based on the distance data. As a result, the drive motor 24 is driven, and the focusing lens is operated to focus (step S18).

When the 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 S1).
9).

In the above step S14, it is checked whether or not the timer at the time of non-reception of ultrasonic waves has been started. If it has not been started, the timer start of step S22 is executed. If it has been started, the process jumps to step S23.

In step S23, it is checked whether the time is up. As a result, if the time has not elapsed, the process returns to step S13. If the time is up, the process proceeds to step S24.

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

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 the remote controller, and FIG. 7 is a plan view schematically showing the remote controller. The camera 10 and the transmitter 22 of this embodiment are substantially the same as those of the above-described first embodiment, but are different from the first embodiment.

That is, a distance measurement start switch 27 is provided as an operation switch of the transmitter 22 in addition to the release switch 26. Further, on the camera 10 side, an LED light receiving unit 40 composed of a pin photodiode is installed. Since this pin photodiode has a faster response speed than the PSD element, it is necessary to distinguish between the distance measurement start signal emitted when the distance measurement start switch 27 is turned on and the release signal emitted when the release switch 26 is turned on. Can be. Further, on both sides of the photographing lens 12, there are provided ultrasonic receiving sections 35 and 36, and these ultrasonic receiving sections 35 and 36 are provided at a distance 1 left and right from the optical axis o of the photographing lens 12. I have. These ultrasonic receivers 3
Each of the 5,36 receiving ports is opened obliquely forward. The microcomputer 32 of the camera 10 includes a counter 34, a distance measurement control unit 33, an incident angle determination unit 41, and an out-of-view-range warning unit.
42 are provided.

The counter 34 outputs the light signal emitted from the LED element 25
The count starts when the light is received by the light receiving unit 40. Subsequently, the time until the ultrasonic receivers 35 and 36 receive the ultrasonic waves emitted from the ultrasonic emitter 23 is counted.

The distance measurement control means 33 obtains the average value C of the count values C ₁ and C ₂ of the receivers 35 and 36, and corresponds to the average value C from the distance required for one count value previously input as distance information. Calculate the 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 an output ratio X from each output value when the ultrasonic receiving units 35 and 36 receive the ultrasonic waves emitted from the ultrasonic emitter 23, and calculates the output ratio X. Then, it is compared with the values 1 / a and a set in correspondence with the photographable angle θ ₂ (view angle) of the photographing lens 12 to determine whether or not the transmitter 22 is within this view angle.

Angle range warning means 42 when the transmitter 22 by the incident angle determining means 41 is determined to not to photographable angle theta _2, based on the determination signal, and outputs a signal to the warning LED units 20 Turn on.

The operation of the second embodiment will be described with reference to the flowcharts of FIGS.

Turn on the power of the camera 10 and place it at an appropriate position facing the subject. At this time, the mode is switched to the remote control priority mode by removing the transmitter 22 from the mounting portion of the camera body 11 (steps S30 and S31).

The photographer who is the subject holds the transmitter 22 and goes forward of the camera, points the transmitter 22 at the camera 10, and starts the distance measurement switch 27.
Turn ON. Then, the microcomputer of the transmitter 22 checks whether the release switch 26 or the distance measurement start switch 27 is turned on (steps S32 and S33).

If it is determined that the distance measurement start switch 27 has been turned ON, the LE on which the distance measurement start data for instructing the start of the distance measurement is placed.
An ultrasonic signal is emitted from the D element 25, and an ultrasonic signal is emitted from the ultrasonic emitter 23 (steps S34 and S37).

On the camera 10 side, when the LED light receiving unit 40 receives the LED light, the counter 34 determines that the reference signal for starting the measurement has been sent.
Starts counting the time difference (steps S35 and S36).

Then, in step S38, it is checked whether or not the ultrasonic wave receiving unit 35 has received the ultrasonic wave. As a result, if not received, the process proceeds to step S40, and if received, the process proceeds to step S60.

In the step S40, it is checked whether or not the timer has been started. If the timer has not been started, the timer is started in step S41. If the timer has been started, the process jumps to step S42.

In step S42, it is checked whether or not the time is up. As a result, if the time has not elapsed, the process returns to step S38. If the time is up, the process proceeds to step S43. In step S43, error processing such as issuing a warning by light or sound is performed.

In step S60, the ultrasonic receiver 35 from the count is started to detect the count value C ₁ to the reception of the ultrasonic waves.

In step S39, it is checked whether or not the ultrasonic wave receiving unit 36 has received an ultrasonic wave.
Proceed to S45, and if received, proceed to step S61.

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

In step S47, it is checked whether or not the time is up. As a result, if the time has not elapsed, the process returns to step S39. If the time is up, the process proceeds to step S48. In step S48, error processing such as issuing a warning by light or sound is performed.

In step S61, the count from the starts ultrasonic receiver 36 detects the count value C ₂ to the reception of the ultrasonic waves.

In step S49, an output ratio X is calculated from the output value Vr of the ultrasonic receiver 35 and the output value Vl of the ultrasonic receiver 36 (X
= Vr / Vl).

Then, in step S50, it is checked whether or not the relationship 1 / a <X <a holds. In FIG.
The range from 1 / a to a indicates the photographable angle θ ₂ (angle of view). As a result, 1 / a <X <If a the relationship is established, the transmitter 22, that the subject will be in a position deviated from the photographable angle theta _2. Therefore, in step S52, an error process is executed, the warning LED light-emitting unit 20 is turned on via the out-of-view-range warning unit 31, and a warning is issued. If the above relationship is established, the process proceeds to step S51.

In step S51, the distance measurement control means 33 obtains an average value C of the count values C ₁ and C ₂ of the receivers 35 and 36, respectively.
In S53, a distance corresponding to the average value C is calculated from a distance corresponding to one count value previously input as distance information. Further, a signal based on the calculated distance value is output to the drive motor 24, the drive motor 24 is driven, and the focusing lens is operated for focusing (step
S54).

Thereafter, the microcomputer 32 checks whether or not a release signal has been input (step S55).

Then, in step S56, the release switch 26 is
N, when the LED light on which the release data is loaded is emitted from the LED element 25, the release process is executed in step S56, and the shutter is released.

As described above, in the second embodiment, the release switch 26 and the distance measurement start switch 27 are provided separately. However, as in a normal camera, the distance measurement start switch 27 is operated by pressing a single switch one step (half-press). Then, the release switch 26 can be operated by double-pressing (full-pressing).

Further, by pressing a single switch, the function of the distance measurement start switch 27 and the function of the release switch 26 may be automatically activated. FIG. 10 is a flowchart showing the third embodiment. In this case, the operations corresponding to steps S33 and S56 described in the flowchart of FIG. 9 are omitted. In other words, since it is a single switch, it is not necessary to check whether the distance measurement start switch 27 has been turned on or not. Since it is released, there is no need to send release data. And
By the automatic operation of the release, step S55 in FIG.
The operation (judgment) corresponding to (1) is not required.

Therefore, when using this remote control device, the transmitter
When the release switch 26 (or the distance measurement start switch 27) is turned on while pointing the camera 22 at the camera 10, the microcomputer of the transmitter 22 checks that the release switch 26 is turned on (step S57). As a result, the LED light on which the distance measurement start data is placed is transmitted from the LED element 25, and at the same time, the ultrasonic waves are emitted from the ultrasonic emitter 23 (steps S58 and 59).

The subsequent operation is the same as that of the flowchart of FIG. 8 showing the second embodiment. After the focusing lens is focused on the basis of 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 the remote controller. The structure of the camera 10 and the transmitter 22 of this embodiment is as follows.
The second embodiment is almost the same as the first embodiment, but differs in the next step.

In other words, in the first embodiment, the arrival time of the ultrasonic signal emitted from the transmitter 22 and the arrival time of the optical signal to the camera 10 are compared, and the distance is measured based on the time difference. Then, the arrival time of the ultrasonic signal emitted from the transmitter 22 and the arrival time of the radio signal are compared, and the distance is measured based on the time difference. Therefore, the transmitter 22 is provided with a radio transmitter 45 instead of the LED element 25, and the camera body 11 is provided with a radio receiver 46 for receiving the radio signal emitted from the radio transmitter 45.

Further, the microcomputer 44 mounted on the camera 10 is provided with a time difference calculating means 47, a distance measuring control means 48, an incident angle detecting means 49, an incident angle discriminating means 50 and an out-of-angle range warning means 51.

The time difference calculating means 47 receives the input data when the radio wave receiving unit 46 receives the radio signal from the radio wave emitter 45 and the input when the ultrasonic receiver 19 receives the ultrasonic signal from the ultrasonic emitter 23. Import, compare and calculate data.

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

The incident angle detecting means 49 detects the angle between the optical axis of the photographing lens 12 and the radio wave signal based on information of the radio wave receiving unit 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 photographing lens 12 to determine whether or not the transmitter 22 is within this angle of view.

The out-of-angle range warning means 51 is provided by the incident angle determination means 50.
When it is determined that the transmitter 22 is not at the photographable angle, a signal is output to the warning LED light-emitting unit 20 and turned on based on the determination signal.

Therefore, when this remote control device is used, the transmitter 22
When the release switch 26 is turned on while aiming at the camera 10, the microcomputer of the transmitter 22 checks that the release switch 26 is turned on. As a result, a radio signal carrying the distance measurement start data is transmitted from the radio transmitter 45, and at the same time, an ultrasonic signal is transmitted from the ultrasonic transmitter 23.

The subsequent operation is substantially the same as that of the first embodiment,
In calculating the ranging data, the time difference calculating means 47 takes in the input data when receiving the radio signal from the radio wave emitter 45 and the input data when receiving the ultrasonic signal from the ultrasonic wave transmitter 23. Compare and calculate.

And a distance control means based on the calculated distance data.
After the 48 focuses the focusing lens, the shutter is automatically released.

[Effect of the Invention] As described above, the camera having the remote controller according to claim 1 of the present invention detects the distance to the transmitter based on the calculation of the time difference between the arrival of the sound wave signal and the light signal. The photographer with the transmitter can easily measure the distance to himself and focus on the camera simply by pointing the transmitter at the camera and performing a simple operation. Therefore, even when not in front of the camera, the photographer can accurately measure the distance to himself.For example, even when shooting in a position shifted from the front of the camera against a mountain background, the photographer can surely focus on himself. Can be taken together. Furthermore, since distance measurement to this transmitter is performed based on a signal directly emitted from the transmitter to the camera, there is a problem in that, for example, in conventional distance measurement by an active method, reflected distance measurement light causes a loss or the like. In addition, the distance measurement accuracy can be improved.

Also, 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 of the radio wave signal and the sound wave signal. The same effect as that of the camera having the remote control device can be obtained.

Further, the camera having the remote control device according to claim 2 can determine whether or not the transmitter is located at the photographable angle based on the optical signal emitted from the transmitter. Is issued, the photographer who is trying to photograph himself with the transmitter can be notified that he is within the photographable angle and that he is out of the photographable angle.

The camera having the remote controller according to the first and second aspects determines whether or not the transmitter is at the photographable angle 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 controller according to the second aspect can be obtained.

[Brief description of the drawings]

FIG. 1 shows a camera having a remote controller according to the present invention.
FIG. 2 is a control block diagram showing a 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. 5 is a flowchart showing the control operation of the remote control device of FIG. 5, FIG. 5 is a flowchart showing the operation of the remote control device on the transmitter side, and FIG. 6 is a second embodiment of the camera having the remote control device of the present invention. FIG. 7 is a plan view showing a camera and a receiver in the second embodiment, FIG. 8 is a flowchart showing a control operation on the camera body side, and FIG. FIG. 10 is a flowchart showing the operation when the transmitter has only a single operation switch. FIG. 11 is a flowchart showing the operation of the camera having the remote controller according to the present invention. Example of It is a control block diagram. 10… Camera, 11… Camera body, 12… Shooting lens, 18,32,
44… Microcomputer, 19… Ultrasonic receiver (sound receiving unit), 21… LED light receiving unit (light receiving unit), 22… Transmitter, 23
… Ultrasonic transmitter (Sound emitting unit), 24… Drive motor, 25…
LED element (light emitting part), 28…, 47… Time difference calculating means, 29,33,
48: distance measurement control means, 30, 49: incident angle detection means, 34: counter, 35, 36: ultrasonic receiver (sound wave receiver), 40: LED light receiver, 45: radio wave emitter (radio wave emitter) ), 46: radio wave receiving section, 50, 52: incident angle discriminating means, c: center of incident light, C
₁ , C ₂ ... count value, l ... distance, o, o ₁ ... optical axis, θ ₁ ... angle with center, θ ₂ ... photographable angle, Vl, Vr ... output value, X
... output ratio.

Continuation of the front page (56) References JP-A-60-139998 (JP, A) JP-A-63-137674 (JP, A) JP-A-63-191133 (JP, A) JP-A-1-109871 (JP) JP-A-3-98032 (JP, A) JP-A 64-54030 (JP, U) JP-A 57-57430 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB G02B 7/28 G03B 17/02 G03B 17/56 G03B 17/38

Claims (3)

(57) [Claims] 1. A camera having a photographing lens and an automatic focusing mechanism, a receiver provided on a camera body, and a remote control device comprising a transmitter separately formed from the camera body. A light-emitting unit for projecting an optical signal and a sound-wave emitting unit for emitting a sound signal provided on a receiver; a light-receiving unit for receiving an optical signal and a light-receiving unit provided on a receiver; Two sound wave receiving units provided at an equal distance from each other; based on output values of sound wave signals respectively received by the two sound wave receiving units, it is determined whether or not a transmitter is within a photographable angle of the photographing lens. Incident angle discriminating means for discriminating; Time difference calculating means for calculating a time difference between a sound wave signal received by the sound wave receiving unit and an optical signal received by the light receiving unit; and a distance between the camera and the transmitter based on the calculated value. Detect
Distance measuring control means for driving the automatic focusing mechanism based on the distance detection data; wherein the time calculating means and the distance measuring control means are arranged such that the incident angle discriminating means sets a transmitter within a photographable angle of the photographing lens. A camera having a remote control device, wherein the calculation and the driving are executed on condition that it is determined that there is a remote controller. 2. A camera having a photographing lens and an automatic focusing mechanism, further comprising a receiver provided on a camera body, and a remote controller comprising a transmitter separately formed from the camera body. A light emitting unit for projecting an optical signal and a sound wave emitting unit for emitting a sound wave signal provided; a light receiving unit for receiving a light signal and a sound wave receiving unit for receiving a sound wave signal provided in a receiver; Incident angle detecting means for detecting the angle between the axis and the center of the optical signal based on information of the light receiving section; based on the detected information of the incident angle detecting means, it is determined whether or not the transmitter is within the photographable angle of the photographing lens. Incident angle discriminating means for discriminating; Time difference calculating means for calculating a time difference between a sound wave signal received by the sound wave receiving unit and an optical signal received by the light receiving unit; and a distance between a camera and a transmitter based on the calculated value. Distance measuring control means for driving the automatic focusing mechanism based on the distance detection data, wherein the time calculating means and the distance measuring control means are arranged such that the incident angle discriminating means is located within a photographable angle of the photographing lens. A camera having a remote control device, wherein the calculation and the driving are performed on condition that it is determined that a transmitter is present. 3. A camera having a photographing lens and an automatic focusing mechanism, further comprising a receiver provided on a camera body, and a remote controller comprising a transmitter separately formed from the camera body. A radio wave emitting unit that emits a radio signal and a sound wave emitting unit that emits a sound wave signal; a radio wave receiving unit that receives a radio signal, and a radio wave receiving unit that is provided in a receiver. Two sound wave receiving units provided at an equal distance from each other; based on output values of sound wave signals respectively received by the two sound wave receiving units, whether or not a transmitter is within a photographable angle of the photographing lens, Angle difference calculating means for calculating a time difference between a sound wave signal received by the sound wave receiving section and a radio wave received by the radio wave receiving section; and between the camera and the transmitter based on the calculated value. Distance to calculate the,
Distance measuring control means for driving the automatic focusing mechanism based on the distance detection data; wherein the time calculating means and the distance measuring control means are arranged such that the incident angle discriminating means sets a transmitter within a photographable angle of the photographing lens. A camera having a remote control device, wherein the calculation and the driving are executed on condition that it is determined that there is a remote controller.