JPH08313976A - Camera - Google Patents

Abstract

PURPOSE: To detect artificial light by serving also as a remote control receiving circuit in order to suppress cost-up and to prevent a mounting space from being increased. CONSTITUTION: The light of a remote control signal for controlling the action of a camera 2 from the outside is received by a remote control signal receiving circuit 4 incorporating a band-pass filter 3 from a remote control transmitter 1. Besides, the camera 2 is set to the receiving mode of the light of the remote control signal by a remote control receiving mode set part 6. According to the waveform of the signal outputted from the receiving circuit 4, the existence of the remote control signal is decided by a remote control signal decision part 7 and the existence of the artifical light whose frequency is different from the remote control signal is decided by an artifical light decision part 8. Then, the filter 3 is controlled by a control part 5 based on the outputs of the set part 6 and the decision part 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera for automatically emitting strobe light, and more particularly to a camera having a function of detecting artificial light by using remote control signal light.

[0002]

2. Description of the Related Art Generally, in photography, when a copy is illuminated with artificial light, for example, with a fluorescent lamp, the resulting photograph has a strong green color and an unnatural color balance. Will be things. In addition, a condition of being illuminated by a fluorescent lamp or the like is usually low in a normal room, and flash photography is performed by the low-luminance automatic light emission function of the camera. Then, the color balance is corrected in the range reached by the flash light.

However, due to the widespread use of high-sensitivity films in recent years, the amount of light is judged to be sufficient even in a room illuminated by a fluorescent lamp, and flash photography is not performed, resulting in a photograph with poor color balance. It's coming.

Therefore, it is possible to correct the color balance by detecting artificial light and performing control such as flashing. As a method of detecting artificial light, for example, in Japanese Patent Publication No. 58-53327, a method of detecting natural light or artificial light having a plurality of light receiving means having sensitivities in different wavelength ranges and detecting the amount of received light and the presence or absence of flicker. Is disclosed.

Further, Japanese Utility Model Laid-Open No. 3-63129 discloses that
A method is described in which the output of a light receiving element is passed through a filter whose extraction frequency can be switched to detect that a large amount of fluorescent lamp light is present.

[0006]

However, the above-mentioned method disclosed in Japanese Patent Publication No. 58-53327 has a plurality of special light receiving means, which leads to an increase in cost and a mounting space. It is also inconvenient for downsizing the camera.

Further, the contents disclosed in Japanese Utility Model Laid-Open No. Sho 63-63129 do not show a concrete plan for extracting a predetermined frequency, and its feasibility is unknown. The present invention has been made in view of the above problems, with the minimum cost increase,
Moreover, it is an object of the present invention to provide a camera capable of detecting artificial light without increasing the mounting space.

[0008]

That is, according to the present invention, a remote control signal receiving means for receiving a remote control signal light for externally controlling the operation of the camera body, and the camera body are set in a reception mode state of the remote control signal light. Remote control signal receiving mode setting means, remote control signal determining means for determining the presence or absence of a remote control signal based on the output signal waveform of the remote control signal receiving means, and artificial light having a frequency different from that of the remote control signal depending on the output signal waveform of the remote control signal receiving means. And a control means for controlling the band-pass filter means provided in the remote control signal receiving means by the outputs of the remote control signal receiving mode setting means and the remote control signal determining means. It is characterized by

[0009]

In the camera of the present invention, the remote control signal light for externally controlling the operation of the camera body is received by the remote control signal receiving means, and the camera body receives the remote control signal light by the remote control receiving mode setting means. Set to mode state. Then, the presence or absence of the remote control signal is determined by the remote control signal determination means based on the output signal waveform of the remote control signal reception means. Also, the presence or absence of artificial light having a frequency different from that of the remote control signal is determined by the artificial light determination means based on the output signal waveform of the remote control signal reception means. Then, the bandpass filter means provided in the remote control signal receiving means is controlled by the control means by the outputs of the remote control receiving mode setting means and the remote control signal determining means.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a schematic configuration of a camera and a remote controller according to the present invention.

A remote control signal light is sent from the remote control transmitter 1 toward the camera 2. The camera 2 has a remote control receiving circuit 4 having a bandpass filter (BPF) 3, a control unit 5 for controlling the frequency of the bandpass filter 3, and the control unit 5 in the remote control signal light reception mode. A remote control signal reception mode setting unit 6 that outputs the following information, a remote control signal determination unit 7 that receives the output of the remote control signal reception circuit 4 and determines the presence / absence of a remote control signal to the control unit 5, and outputs the remote control signal reception circuit 4. It is configured by an artificial light determination unit 8 which receives and determines the presence or absence of artificial light.

In such a configuration, the remote control signal light transmitted from the remote control transmitter 1 is received by the remote control receiving circuit 4 built in the camera 2. The subject light and the illumination light that illuminates the subject are also input to the remote control receiving circuit 4.

The band pass filter 3 inside the remote control receiving circuit 4 can switch the frequency (center frequency) to be extracted. The center frequency can be switched according to the carrier frequency of the remote control signal and the frequencies of some kinds of artificial light sources. The signal in which only the set center frequency component is extracted is supplied to the remote control signal determination unit 7 and the artificial light determination unit 8, and the presence or absence of the remote control signal and the presence or absence of artificial light are respectively determined.

On the other hand, in the bandpass filter 3, the control unit 5 sets the center frequency. The control unit 5 determines the center frequency of the bandpass filter 3 to be set based on the determination result of the remote control signal determination unit 7 and the information set by the remote control reception mode setting unit 6.

That is, the center frequency of the bandpass filter 3 of the remote control receiving circuit 4 of the camera 2 can be switched by the control unit 5. Further, the presence or absence of artificial light is determined from the output of the remote control receiving circuit 4.

FIG. 2 shows an example of the configuration of the remote control receiver circuit shown in FIG. 1. FIG. 2 (a) is a block diagram of the remote control receiver circuit capable of detecting artificial light, and FIG. FIG. 3 is a block diagram of a remote control receiving circuit that can be used also for.

In FIG. 2A, the remote control receiving circuit 10a is amplified by a light receiving section 11 for receiving remote control signal light and object light, and a preamplifier 12 for amplifying a signal from the light receiving section 11. A switch 13 for switching the output destination of the signal and a bandpass filter (BPF) for remote control
14 and artificial light bandpass filter (BPF) 15
, A detection integration circuit 16 and a waveform shaping circuit 17. Incidentally, 18 is a C for controlling the switching of the switch 13.
It is PU.

The remote control signal light and the subject light emitted from a remote control transmitter (not shown) are received by the light receiving section 11, and the signals received here are voltage-converted and amplified by the preamplifier 12. The switch 13 switches the output destination of the amplified signal, and is operated by the CPU 18.

In the remote control reception waiting mode, the switch 1
3 is switched to the remote control band pass filter 14 side, and the signal is transmitted to the remote control band pass filter 14. The remote control bandpass filter 14 extracts and outputs only the frequency component of the remote control signal from the input signal. The remote control signal extracted here is output as a rectangular wave of the remote control signal through the detection integration circuit 16 and the waveform shaping circuit 17. The above configuration is basically the same as the conventional remote control receiving circuit.

On the other hand, in the artificial light detection mode, CP
The switch 13 is switched to the artificial light bandpass filter 15 side by U18, and the signal amplified by the preamplifier 12 is transmitted to the artificial light bandpass filter 15.

The bandpass filter 15 for artificial light is
Different from the characteristic of passing a specific frequency like the remote control bandpass filter 14, it is designed to pass a signal of a wide frequency such as a commercial frequency of artificial light and an inverter type fluorescent lamp. When the signal contains a frequency component that passes through the artificial light bandpass filter 15, that is, when the artificial light component is included, the signal is sent to the detection integration circuit 16 and the waveform shaping circuit 17 in the subsequent stage. Is transmitted and an artificial light detection signal is output.

In the circuit shown in FIG. 2A, a bandpass filter corresponding to the frequency of artificial light (mainly a lighting device using a commercial power source and an inverter-controlled fluorescent lamp) is added to the conventional remote control receiving circuit. Other than the band pass filter, the remote control circuit is shared. That is, the remote control reception and the artificial light detection can be switched by selectively using the two band pass filters.

On the other hand, the remote control receiver circuit 10b shown in FIG. 2B has variable characteristics instead of the switch 13, the remote control bandpass filter 14 and the artificial light bandpass filter 15 shown in FIG. 2A. It is configured using a bandpass filter (BPF) 19.

That is, in FIG. 2B, the remote control signal light and the subject light emitted from the remote control transmitter (not shown) are received by the light receiving section 11, and the signals received here are converted in voltage to the preamplifier 12. Is amplified.

The amplified signal is input to the variable characteristic band pass filter 19 which is controlled by the CPU 18 and can pass only an arbitrary frequency component. The signal in which only the arbitrary frequency component is extracted by the variable characteristic band pass filter 19 is detected by the detection integration circuit 16 in the subsequent stage.
It is transmitted to the waveform shaping circuit 17 and detected as a remote control signal or an artificial light detection signal.

For example, when the variable characteristic bandpass filter 19 is controlled by the CPU 18 and only the frequency component of the remote control signal is set to pass, it is possible to determine whether or not the signal is the remote control signal by the signal obtained from the output terminal. it can.

Further, when only the commercial frequency component of 50 to 60 Hz is set to pass, it is possible to determine whether or not artificial light illumination is performed with an incandescent lamp or the like. 40 kHz to 100
When set to pass the frequency component of kHz,
It is possible to determine whether or not the fluorescent lamp is controlled by an inverter.

FIG. 3 schematically shows a circuit for changing the frequency characteristic of the variable characteristic bandpass filter 19 shown in FIG. 2 (b). FIG. 3A is a diagram showing an example in which the variable characteristic bandpass filter 19 is configured by an operational amplifier and a transistor.

In the figure, the variable characteristic bandpass filter 19 has a reference current circuit therein, and the frequency characteristic of the bandpass filter is determined by the amount of reference current (I _ref ) output from the variable current bandpass filter 19. Is determined.

The reference current circuit is composed of an operational amplifier 21, a transistor 22 and an external resistor R, to which a reference voltage (V _ref ) is input from the outside. Operational amplifier 2
1 is used as a voltage follower, I _ref
The reference current (I _ref ) determined by the relational expression of = V _ref / R is output. The frequency characteristic of the bandpass filter can be changed by changing the resistance R and the reference voltage V _ref .

FIG. 3B shows the reference voltage (V _ref ) in the variable characteristic bandpass filter 19 of FIG. 3A.
It is a block diagram of a circuit that can be changed. FIG.
A programmable voltage source 23 is connected to the variable characteristic bandpass filter 19 of (a) as a reference voltage source,
By externally controlling this, the reference voltage (V _ref ) is changed and the frequency characteristic of the band pass filter is changed. The programmable voltage source 23
Specifically, a D / A converter is used.

FIG. 3C shows a configuration in which the reference current circuit itself shown in FIG. 3A is configured as a programmable current source. Voltage follower connected operational amplifier 2
In the output stage of 4, a plurality of transistors 25 (in this case 3
Transistors 26, 27, 28 are connected in parallel. Then, the switches (SW) 30, 31 are connected to the outputs (collectors) of the transistors 26, 27, 28, respectively.
32 is connected and is switched by the CPU 18.

Here, when the switches 30 to 32 are connected to the left side in the figure, the output currents 26 to 28 of the transistors are output as I _ref ′. On the other hand, the switch 30
When .about.32 are connected to the right side in the drawing, the output currents of the transistors 26 to 28 are connected to the bypass lines and are not used as the reference current of the bandpass filter. That is, the switch 30 to 32 I _ref increases when increases the number to be connected to the left side in the figure, I _ref is reduced when increasing the number to be connected to the right.

The maximum I that the reference current circuit can output
_ref is determined by the relational expression of I _ref ′ = V _ref / R. If four output transistors 25 to 28 are connected in parallel as shown and the output current ratio of each transistor is 1: 1: 1: 1, if all three switches are connected to the right side, I _ref = (1/4) × (V _ref /
R). Similarly, if all switches are connected to the left side, then I _ref = (4/4) × (V _ref / R).

Here, assuming that the number of switches connected to the left side is n, I _ref = ((n + 1) / 4) × (V
_The reference current I _ref can be changed by the relational expression _ref / R).

Further, the output current ratio of the transistors connected in parallel may be changed to give a weighted design to widen the dynamic range of I _ref which can be changed. Furthermore,
By increasing the number of transistors connected in parallel,
The dynamic range and resolution of I _ref may be improved.

As described above, with the circuit configuration as shown in FIGS. 1 to 3, it becomes possible to add an artificial light detecting function to the remote control receiving circuit. FIG. 4 shows an example of waveforms of output signals of the remote control receiving circuit and the artificial light detecting circuit described above.

FIG. 4A shows an output waveform when no optical signal is input to the circuit or only natural light is input. It can be determined that the remote control signal is not received in the remote control reception mode, the artificial light is not illuminated in the artificial light detection mode, or only natural light is illuminated. it can.

FIG. 4B shows a waveform when a remote control signal is input to the above circuit. The remote control signal is an optical signal (carrier) of a specific frequency modulated into a specific pattern. This is a waveform obtained from the output terminal when a remote control signal is received with the bandpass filter switched to the remote control reception mode in which the carrier frequency of the remote control signal is set.

The waveform is shown in FIG. 4 in the remote control reception mode.
When it is recognized that the pattern is peculiar to the remote control signal as shown in (b), it can be determined that the remote control signal is generated. FIG.
(C) is a waveform when strong (high brightness) artificial light enters the above circuit. When the circuit is set to the artificial light detection mode and strong artificial light always enters, the output terminal is always at "L (low)" level. This requires that the bandpass filter settings and the artificial light frequency match.

FIG. 4D shows a waveform when weak (low luminance) artificial light enters the above circuit. Even if the setting of the bandpass filter and the frequency of the artificial light match, if the incident artificial light is weak, a stable "L" level output cannot be obtained and the pulse becomes discontinuous.

FIG. 4E shows a waveform when noise is introduced into the above circuit. Various types of noise sources are conceivable. For example, very weak artificial light is also a noise source. However, artificial light that is weak to this extent rarely affects photography and is indistinguishable from other noise sources. Therefore, the circuit output is almost "H".
When a signal with a very narrow pulse width is occasionally output at the (high) level, it is determined that there is no remote control signal and no artificial light is incident.

The above can be summarized as follows. In the state where the above circuit is set to the remote control reception mode, if the waveform as shown in FIG. 4 (b) is obtained, it is judged that the remote control signal is received, and if the waveform is other than that, the remote control is received. It is determined that the signal is not received.

In the state where the artificial light detection mode is set, when the waveform is as shown in FIG. 4A, no artificial light is incident, that is, natural light is incident unless it is dark. It is determined that it has been done.

In the state where the artificial light detection mode is set, when the waveforms shown in FIGS. 4C and 4D are obtained, it is judged that the artificial light is incident. It In this example, since strong artificial light and weak artificial light can be distinguished, it is possible to perform exposure control such as changing the strobe light emission amount according to the strength of the artificial light.

Further, in the state where the artificial light detection mode is set, when the waveforms shown in FIGS. 4 (b) and 4 (e) are obtained, it is determined that no artificial light is incident. To be judged.

Next, the processing operation for detecting artificial light with the waveform shown in FIG. 4 using the remote control receiving circuit capable of detecting artificial light shown in FIG. It will be described with reference to FIG.

In order to perform the artificial light detection process, first, in step S1, the variable characteristic bandpass filter 19 is controlled by the CPU 18 of FIG. 2B to initialize the center frequency. For example, the variable characteristic bandpass filter 19
Is set to the lowest frequency in the set frequency range.

Next, in step S2, the waveform at the output terminal of the circuit is read. The presence or absence of artificial light is determined according to the determination method based on the waveform shown in FIG. Here, if there is artificial light, the process is branched to perform the processing when there is artificial light. On the other hand, if there is no artificial light, the process proceeds to step S3, and since the artificial light is not detected at the center frequency in the initial setting, the center frequency is changed (if the lowest frequency is set in the initial setting, Changed to a higher frequency).

Next, in step S4, it is determined whether or not the center frequency of the variable characteristic bandpass filter 19 is set to the limit. In the artificial light detection process, the central frequency of the variable characteristic band pass filter 19 is changed and then the presence or absence of artificial light is determined. When exceeds the settable frequency range, it is determined that the limit of the set frequency of the bandpass filter has been reached.

In step S4, if the set center frequency has not reached the limit yet, the above step S2 is performed.
Then, the artificial light determination is performed again, and the same operation as above is repeated. On the other hand, when the set center frequency reaches the limit, processing without artificial light is performed.

In this way, the artificial light detection processing is performed. By the way, when actually mounting a remote control reception and artificial light detection circuit as shown in FIGS. 2 (a) and 2 (b) on a camera, it is necessary to devise a circuit switching procedure in the remote control mode.

The camera has a remote control mode used when waiting for remote control reception. The artificial light is detected in both the remote control mode and the remote control mode to control the exposure and flash device. At this time, the operation of using the remote control receiving circuit for artificial light detection will be described with reference to the flowchart of FIG.

Initially, the camera is in a power-on state.
Then, in step S11, it is determined whether or not the current operating state of the camera is the remote control mode. If the remote control mode is not set, the process proceeds to step S12 and artificial light detection processing is performed. This artificial light detection process is shown in FIG.
The presence or absence of artificial light is determined by the operation as shown in the flow chart.

When the presence or absence of artificial light is determined in step S12, it is then checked in step S13 whether the camera operation switch has been operated (key operation). Next, at step S14, as a result of the step S13, it is determined whether or not the release switch has been operated. Here, if the release operation has not been performed, the process returns to step S12 and the check of the artificial light detection process is repeated. When the release operation is performed in step S14, the process proceeds to step S15, and the release process, that is, the exposure operation is performed.

The exposure control in this exposure operation is performed based on the result of the artificial light detection processing performed in step S12. If the remote control mode is selected in step S11, the process proceeds to step S16, and a remote control signal detection process is performed. Then, in step S17, as a result of the processing in step S16, it is determined whether or not the remote control signal is detected, that is, whether or not the remote control signal is received. If the remote control signal is not received, step S
Returning to step 16, the remote control signal detection process is repeated. On the other hand, when the remote control signal is received, the process proceeds to step S18, where artificial light detection processing is performed.

When the artificial light is detected, step S
In step 19, the interval time until the release operation is performed after receiving the remote control is counted. In this example, the remote controller interval is counted after the artificial light detection process is completed, but the artificial light detection process and the remote controller interval count may be overlapped.

When the remote controller interval count is completed, the process proceeds to step S15, and the release process based on the result of the artificial light detection process of step S18 is performed. Briefly described above, when not in the remote control mode, the remote control reception and artificial light detection circuit works only as an artificial light detection circuit.In the remote control mode, the remote control reception circuit until the remote control signal is received, and the artificial light detection after the remote control reception. Artificial light detection is performed by switching to the light detection circuit.

According to the embodiment of the present invention as described in detail above, the following constitution can be obtained. That is, (1) remote control signal receiving means for receiving a remote control signal light for externally controlling the operation of the camera body, remote control reception mode setting means for setting the camera body in the reception mode state of the remote control signal light, and Remote control signal determining means for determining the presence or absence of a remote control signal based on the output signal waveform of the remote control signal receiving means, and artificial light determining means for determining the presence or absence of artificial light having a frequency different from that of the remote control signal based on the output signal waveform of the remote control signal receiving means. And a control means for controlling the bandpass filter means provided in the remote control signal reception means by the outputs of the remote control reception mode setting means and the remote control signal determination means.

(2) By setting the remote control reception mode by the remote control reception mode setting means,
The camera according to (1) above, wherein the bandpass filter means is switched for remote control reception, and after the remote control signal is received, the bandpass filter means is switched for artificial light detection.

(3) Remote control signal receiving means for receiving remote control signal light for externally controlling the operation of the camera body, and remote control signal determining means for determining the presence or absence of a remote control signal based on the output signal waveform of the remote control signal receiving means. A camera comprising: and determining the presence or absence of artificial light using the output of the remote control signal receiving means.

(4) Remote control signal receiving means for receiving remote control signal light for externally controlling the operation of the camera body, and remote control signal determining means for determining the presence or absence of a remote control signal based on the output signal waveform of the remote control signal receiving means. And an artificial light judging means for judging the presence or absence of artificial light having a frequency different from that of the remote controller signal according to the output signal waveform of the remote controller signal receiving means.

(5) Light receiving means for receiving the light incident from the outside of the camera body and outputting it through the bandpass filter means, and for operating the camera from the outside based on the output signal waveform of the light receiving means. A remote control signal determining means for determining the presence or absence of a remote control signal, an artificial light determining means for determining the presence or absence of artificial light having a frequency different from that of the remote control signal based on the output signal waveform of the light receiving means, and a band in the light receiving means. And a control unit for changing the frequency characteristic of the pass filter unit.

(6) The bandpass filter means is
The camera according to (1) or (5) above, which has a bandpass filter for receiving a remote control signal and a bandpass filter for detecting artificial light.

(7) The remote control signal receiving band pass filter and the artificial light detecting band pass filter are:
The camera according to (6) above, wherein the operation is switched by the control means.

(8) The bandpass filter means is
The camera according to any one of (1) and (5) above, wherein the control circuit is configured to change the center frequency.

(9) The bandpass filter means is
The changeable frequency range includes a carrier frequency of a remote control signal and a frequency peculiar to artificiality (8)
The camera described in.

[0068]

As described above, according to the present invention, the artificial light detection can be performed only by improving the bandpass filter in the remote control receiving circuit, so that the cost increase is negligible.
It does not increase the mounting space. In addition, since the artificial light determination means can be realized by software, there is no increase in cost and mounting space. As a result, it is possible to provide a camera with an artificial light detection function that does not increase the size of the camera with a slight increase in cost.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic configuration of a camera and a remote controller according to the present invention.

2A and 2B show configuration examples of the remote control receiving circuit in FIG. 1, where FIG. 2A is a block diagram of a remote control receiving circuit capable of detecting artificial light, and FIG. FIG. 3 is a block diagram of a remote control reception circuit that does.

FIG. 3 is a schematic diagram showing a circuit for changing the frequency characteristic of the variable characteristic bandpass filter 19 shown in FIG. 2B. FIG. 3A shows the variable characteristic bandpass filter 19 composed of an operational amplifier and a transistor. Figure showing an example, (b)
Is a block diagram of a circuit in which the reference voltage (V _ref ) can be changed in the variable characteristic bandpass filter 19 of FIG. 7A, and FIG. 7C is the reference current circuit itself of FIG. It is a circuit diagram comprised as a programmable current source.

FIG. 4 shows an example of waveforms of output signals of a remote control reception circuit and an artificial light detection circuit. FIG. 4A shows an output when no optical signal enters the above circuit or when only natural light enters. Waveform diagram, (b) is a waveform diagram when a remote control signal is input to the circuit, (c) is a waveform diagram when a strong artificial light is input to the circuit, and (d) is a weak artificial light to the circuit. FIG. 6E is a waveform diagram when noise is included in the circuit, and FIG.

5 is a flowchart illustrating a processing operation of performing artificial light detection with the waveform shown in FIG. 4, using the remote control receiving circuit capable of detecting artificial light shown in FIG. 2 (b).

FIG. 6 is a flowchart illustrating an operation of a camera that uses a remote control reception circuit for artificial light detection.

[Explanation of symbols]

1 ... Remote control transmitter, 2 ... Camera, 3 ... Band pass filter (BPF), 4 ... Remote control receiving circuit, 5 ... Control part,
6 ... Remote control reception mode setting section, 7 ... Remote control signal determination section, 8 ... Artificial light determination section, 10a, 10b ... Remote control receiving circuit, 11 ... Light receiving section, 12 ... Preamplifier, 13 ... Switch, 14 ... Remote control bandpass filter (BPF),
15 ... Bandpass filter (BPF) for artificial light, 16 ...
Detection integrator circuit, 17 ... Waveform shaping circuit, 18 ... CPU, 1
9 ... Variable characteristic band pass filter (BPF).

Claims (3)

[Claims] 1. A remote control signal receiving means for receiving a remote control signal light for externally controlling the operation of the camera body, a remote control reception mode setting means for setting the camera body in a reception mode state of the remote control signal light, Remote control signal determining means for determining the presence or absence of a remote control signal based on the output signal waveform of the remote control signal receiving means, and artificial light determining means for determining the presence or absence of artificial light having a frequency different from that of the remote control signal based on the output signal waveform of the remote control signal receiving means. And a control means for controlling the bandpass filter means provided in the remote control signal receiving means by the outputs of the remote control signal receiving mode setting means and the remote control signal determining means. 2. The bandpass filter means includes a remote control signal receiving bandpass filter and an artificial light detection bandpass filter, and the remote control signal receiving bandpass filter and artificial light detection bandpass. The camera according to claim 1, wherein the pass filter is switched by the control means. 3. The band pass filter means is configured such that the center frequency can be changed by the control circuit.
The variable frequency range includes a carrier frequency of a remote control signal and a frequency peculiar to artificial light.
The camera described in.