JP4384836B2 - camera - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a light emitting device, and more particularly to a light emitting device capable of controlling a light emission time.
[0002]
[Prior art]
Conventionally, when a moving subject is imaged, a method has been used in which the exposure time is set to a slow shutter of 1/15 second and the image is taken so that a part or the whole of the subject is blurred. .
[0003]
In addition, a light-emitting device that is easy to carry (a flash device such as a flash) that can compensate for a shortage of the light amount of the subject by irradiating auxiliary light to the subject being exposed is generally used.
[0004]
[Problems to be solved by the invention]
When slow shutter imaging is performed using a conventional light emitting device, the relationship between the exposure brightness (light emission intensity) in the camera and the light emission brightness emitted by the light emitting device is as shown in FIG. Therefore, when the light emitting device emits light during the exposure by the slow shutter and the subject is imaged, for example, an image as shown in FIG. 10 is obtained.
[0005]
The image shown in FIG. 10 is an image obtained by capturing a person against the background of a moving train. However, since the light amount of the entire subject is insufficient, auxiliary light is emitted during exposure. Since the auxiliary light emission time Tf0 (usually about 200 μs) is extremely short compared with the exposure time Ts0 (seconds), the background train as well as the person is mostly exposed during this light emission time Ts0. Resulting in. Therefore, the moving train is also stopped and picked up, so that the effect of moving feeling due to picking up with the slow shutter is not expressed at all.
[0006]
In addition, since LEDs used for pilot lamps and the like have been designed for the purpose of emitting light continuously, countermeasures for improving the light emission luminance when light is emitted almost instantaneously like a light emitting device in a camera are taken. However, when used as a light emitting device of a camera, the potential capability inherent in the LED element could not be fully exhibited.
[0007]
The present invention has been made in view of such circumstances, and an object of the present invention is to provide a light emitting device capable of obtaining a dynamic imaging effect by a slow shutter even when a subject is dark.
[0008]
Further, according to the present invention, the light emission brightness is adjusted based on the acquired information on the distance between the camera and the main subject, so that when the person existing in the vicinity of the camera is imaged, the anti-glare effect is applied to the subject person. It is possible to provide a light emitting device having the following.
[0009]
[Means for Solving the Problems]
  In order to achieve the above object, a camera according to the first aspect of the present invention includes an imaging unit that captures an image, a photometric unit that divides and measures light from a subject,Distance information acquisition means for acquiring information about the distance between the camera and the target, and the light emitting diode or organic ELComprising semiconductor light emitting means,During slow shutter imaging by the imaging means,When acquiring information instructing light emission of the semiconductor light emitting means,in frontThe semiconductor light emitting means is synchronized with the shutter timing of the imaging means.With constant light emissionLight emitting device that continues to emit lightIn the case where the target is located near the camera, the luminance is reduced based on the information on the distance between the camera and the target obtained from the distance information obtaining unit, and the target is located far from the camera. A light-emitting device that emits light from the semiconductor light-emitting means at a current value that increases the light emission luminance, or a duty ratio of the current;When a slow shutter image is taken by the imaging means, and the target is measured by the photometry means, and the amount of light obtained from the target reaches a specified value.,in frontControl means for executing processing for closing the shutter of the imaging meansThe exposure time of the camera at the time of the slow shutter imaging, the semiconductor light emitting means continues to emit lightIt is characterized by that.
[0010]
According to the present invention, when the information for instructing light emission is acquired, the semiconductor light emitting means continues to emit light for a predetermined time based on the exposure time of the camera. A certain imaging effect can be obtained.
[0011]
Invention 2 of the present application, in the camera according to Invention 1 of the present application, when the light emitting device acquires information instructing light emission, the semiconductor light emitting device emits light with a predetermined current based on the light emission amount or the light emission luminance to be emitted by the semiconductor light emitting device. It is characterized by doing.
[0012]
According to the present invention, when the information instructing light emission is acquired, the semiconductor light emitting device emits light with a predetermined current based on the light emission amount or the light emission luminance to be emitted by the semiconductor light emitting device. It is possible to freely adjust the amount of emitted light, and even when the subject is dark, it is possible to obtain a moving imaging effect with a slow shutter.
[0014]
According to the present invention, when the information for instructing light emission is acquired, if the main subject exists near the camera based on the acquired information on the distance between the camera and the main subject, the light emission luminance is reduced and the main subject is reduced. Since the semiconductor light emitting means emits light with a current value that increases the light emission luminance or a duty ratio of the current when it is in the distance of the camera, the object of the subject when shooting a person in the vicinity of the camera Demonstrate anti-glare effect on people.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of a light emitting device according to the present invention will be described in detail with reference to the accompanying drawings.
[0016]
FIG. 1 is a diagram illustrating a state in which slow shutter imaging is performed by a camera with a light emitting device.
[0017]
As shown in the figure, the user performs slow shutter imaging of a person against a background of a moving train using the camera 100. The camera 100 includes a shutter release button 102 for a user to input an imaging instruction, a finder 103 for a user to check a subject image at the time of imaging, a photographing lens 110 that forms the subject image on an imaging surface, and a camera at the time of imaging. A light emitting device 146 that emits auxiliary light to the subject is provided. Note that the light-emitting device 146 is a light-emitting device using a semiconductor light-emitting element such as an LED, an organic EL, or a plasma light emitter, and can continuously emit light.
[0018]
FIG. 2 is a block diagram of a signal processing system of the camera with a light emitting device according to the present invention.
[0019]
The subject image formed on the light receiving surface of the solid-state image sensor (CCD) 114 via the photographing lens 110 and the shutter / aperture 112 is converted into an amount of signal charge corresponding to the amount of incident light. The charge of the image signal accumulated in the solid-state image sensor 114 for a predetermined exposure time is output to the shift register by the read gate pulse applied from the CCD drive circuit 116, and sequentially output as a voltage signal corresponding to the signal charge by the register transfer pulse. Is done. The solid-state imaging device 114 may have a so-called electronic shutter function that can sweep out the accumulated signal charge by a shutter gate pulse and thereby control the charge accumulation time (exposure time).
[0020]
The voltage signal of the image sequentially read out from the solid-state imaging device 114 is applied to a correlated double sampling circuit (CDS circuit) 118, where the R, G, B signals for each pixel are sampled and held, and A / D Applied to the converter 120. The A / D converter 120 converts the R, G, B signals sequentially added from the correlated double sampling circuit 118 into digital R, G, B signals and outputs them. The CCD drive circuit 116, the correlated double sampling circuit 118, and the A / D converter 120 are driven in synchronization with a timing signal applied from the timing generation circuit 122.
[0021]
The R, G, B signals output from the A / D converter 120 are temporarily stored in the memory 124, and then the R, G, B signals stored in the memory 124 are added to the digital signal processing circuit 126. . The digital signal processing circuit 126 includes a synchronization circuit 128, a white balance adjustment circuit 130, a gamma correction circuit 132, a YC signal generation circuit 134, a memory 136, and the like.
[0022]
The synchronization circuit 128 converts the dot-sequential R, G, and B signals read from the memory 124 into a simultaneous expression, and outputs the R, G, and B signals to the white balance adjustment circuit 130 at the same time. The white balance adjustment circuit 130 includes multipliers 130R, 130G, and 130B for increasing and decreasing the digital values of the R, G, and B signals. The R, G, and B signals are respectively multiplied by the multipliers 130R, 130G, and 130B, respectively. Added to 130B.
[0023]
A white balance correction value (gain value) for white balance control is added from the central processing unit (CPU) 138 to other inputs of the multipliers 130R, 130G, and 130B. The multipliers 130R, 130G, and 130B Each of the two inputs is multiplied, and R ′, G ′, and B ′ signals that have undergone white balance adjustment by this multiplication are output to the gamma correction circuit 132.
[0024]
The gamma correction circuit 132 changes the input / output characteristics so that the white balance adjusted R ′, G ′, and B ′ signals have desired gamma characteristics, and outputs them to the YC signal generation circuit 134. The YC signal creation circuit 134 creates a luminance signal Y and chroma signals Cr and Cb from the gamma-corrected R, G, and B signals. These luminance signal Y and chroma signals Cr and Cb (YC signal) are stored in the memory 136 in the same memory space as the memory 124.
[0025]
Here, by reading the YC signal in the memory 136 and outputting it to the liquid crystal monitor 152, a through image, a captured still image, or the like can be displayed on the liquid crystal monitor 152.
[0026]
The YC signal after imaging is compressed into a predetermined format by the compression / expansion circuit 154 and then recorded on a recording medium such as a memory card by the recording unit 156. Further, in the reproduction mode, image data recorded on a memory card or the like is decompressed by the compression / decompression circuit 154 and then output to the liquid crystal monitor 152 so that the reproduced image is displayed on the liquid crystal monitor 152. .
[0027]
The central processing unit 138 controls each circuit based on input information from a camera operation unit 140 (input means) including a mode dial, a shutter release button 102, a cross key, and the like, as well as autofocus, automatic exposure control, white Control balance and so on. This autofocus control is, for example, contrast AF that moves the photographing lens 110 so that the high-frequency component of the G signal is maximized, and the drive unit so that the high-frequency component of the G signal is maximized when the shutter release button 102 is half-pressed. The photographing lens 110 is moved to the in-focus position via 142.
[0028]
In the automatic exposure control, R, G, and B signals are taken, subject luminance is obtained based on an integrated value obtained by integrating these R, G, and B signals, and an aperture value and a shutter speed at the time of imaging are calculated based on the subject luminance. To decide.
[0029]
When aperture priority, shutter speed priority, or other imaging conditions are input from the user via the camera operation unit 140, imaging is performed with the aperture value and shutter speed based on the input instruction. Further, when the light amount of the subject is insufficient or when the light emission of the light emitting device 146 is instructed via the camera operation unit 140, auxiliary light is emitted from the semiconductor light emitting means based on an instruction from the user as appropriate. An instruction to emit light is output.
[0030]
When the exposure value determined from the aperture value and the shutter speed set in the camera 100 is EV, and the appropriate exposure is Lx, the light amount SV that the light emitting device 146 should emit is SV = Lx−EV · k (k is (Constant).
[0031]
When the user performs an operation of fully pressing the shutter release button 102, the camera 100 enters a mode for performing imaging. At the time of imaging, the central processing unit 138 drives the aperture portion of the shutter / aperture 112 via the aperture drive unit 144 so that the determined aperture value is obtained, and the determined exposure time (shutter speed) is obtained. Then, the charge accumulation time is controlled by an electronic shutter to capture one frame of image data, and after predetermined signal processing, it is recorded on a recording medium.
[0032]
Note that the amount of auxiliary light emitted by the light emitting device 146 needs to be adjusted as appropriate according to the brightness of the subject and the distance to the subject. Since it is harsh to force the user to perform this adjustment process, the necessary light emission luminance is calculated according to the brightness of the subject measured on the camera 100 side, the distance to the subject, and the exposure time. On the other hand, the light emission brightness adjusted based on the light quantity information input via the camera operation unit 140 as the seasoning of the image by the user may be instructed to emit light from the light emitting device 146.
[0033]
Note that the central processing unit 138 has shutter release timing information, distance information to the main subject (focus position information during autofocus), subject brightness information, auxiliary light emission luminance information, and auxiliary light emission light quantity information. Various other information can be transmitted to the light emitting device 146 via a serial communication means or I / O.
[0034]
In the above description, the embodiment in which the camera 100 is an electronic camera has been described. However, the present invention is not limited to the electronic camera, and the present invention is applicable to a silver salt camera that exposes a subject image on a silver salt film. It is possible to achieve the object of the invention.
[0035]
Next, a method for controlling the light emitting device 146 according to the present invention will be described.
[0036]
FIG. 3 is a block diagram of a signal processing system of the light emitting device 146 built in the camera 100.
[0037]
The light emitting device 146 records information such as the light emission time, light emission amount, light emission luminance corresponding to the shutter speed, the light emission time corresponding to the specified light emission color temperature, the light emission amount, light emission luminance, etc. according to the distance to the subject. ROM 25, light-receiving sensor 34 for adjusting the amount of emitted light, battery 40, voltage variable circuit 42 that outputs voltage and current for adjusting the light emission luminance of semiconductor light-emitting element 38 (current supplied to semiconductor light-emitting element 38) And a system controller 52 (exposure time information acquisition means, light emission information acquisition means, light emission control) that outputs a light emission luminance adjustment command and light emission timing of the semiconductor light emitting element 38. And a function of a light emission amount information acquisition unit, a distance information acquisition unit, and a supply current calculation unit).
[0038]
The system controller 52 performs overall control of the light emitting device 146.
[0039]
The system controller 52 (distance information acquisition means) can acquire information related to the distance between the camera and the main subject from the central processing unit 138 of the camera 100 or the like.
[0040]
The system controller 52 (light emission information acquisition means) can acquire information instructing light emission of the semiconductor light emitting element 38 (semiconductor light emission means) from the central processing unit 138 of the camera 100 or the like.
[0041]
Further, the system controller 52 (supply current calculation means) darkens the light emission luminance when the main subject exists near the camera based on the information recorded in the ROM 25 or the like and the acquired distance information. Is present in the distance of the camera, it is possible to calculate the supply current value for the semiconductor light emitting means for increasing the light emission luminance or the duty ratio of the supplied current.
[0042]
Further, when the system controller 52 (light emission control means) obtains light emission information from the central processing unit 138 or the like of the camera 100, the color of the auxiliary light emitted from the semiconductor light emitting element 38 to the voltage variable circuit 42 and the auxiliary light emitted. It is possible to output a command for the calculated current value for adjusting the luminance of the current.
[0043]
When the system controller 52 (light emission control means) acquires the light emission information information, the system controller 52 issues a light emission instruction based on the duty ratio of the current supplied to the semiconductor light emitting element 38 via the control circuit (a transistor in the example shown in FIG. 3). It is possible to output to the semiconductor light emitting element 38. As described above, the system controller 52 can instruct the semiconductor light emitting element 38 with the light emission timing, the light emission time, and the light emission amount information such as the light emission luminance or the light emission amount. Since the semiconductor light emitting element 38 starts to emit light immediately when a current is supplied, it is possible to stop the light emission and the light emission in synchronization with the shutter timing of the camera.
[0044]
In the above-described embodiment, the central processing unit 138 and the system controller 52 have been described separately. However, the present invention is not limited to this, and the central processing unit 138 (exposure) The function executed by the system controller may be included in the functions of time information acquisition means, light emission information acquisition means, light emission control means, light emission quantity information acquisition means, distance information acquisition means, and supply current calculation means). It is possible to achieve the object of the present invention.
[0045]
Further, when the light emission amount of the semiconductor light emitting element 38 varies depending on the environmental temperature and the physical properties of the semiconductor light emitting means, a temperature sensor 56 for detecting the ambient temperature is provided in the vicinity of the semiconductor light emitting element 38, and the system controller 52. The light emission quantity and emission luminance of the semiconductor light emitting element 38 can be adjusted based on the ambient temperature detected by the temperature sensor 56 so that the required light emission quantity can be obtained regardless of the ambient temperature. .
[0046]
When the user presses the shutter release button 102 halfway for imaging, the system controller 52 performs processing for reading information for determining the light emission amount and the light emission luminance from the ROM 25 such as the guide number of the light emitting device 146. When the auxiliary light emission mode is set to the auto mode, the brightness of the subject is read from the light receiving sensor 34 or the like to control the light emission amount of the auxiliary light. When the auxiliary light emission mode is set to the manual mode, the setting information (emission light emission) such as the exposure time, aperture opening, light emission amount, or light emission luminance input and set by the user via the camera operation unit 140 is set. Light quantity information) is read from the central processing unit 138. Even when auxiliary light emission is placed under the control of the camera 100, setting information relating to light emission such as exposure time, aperture opening, light emission amount, and light emission luminance is read from the central processing unit 138.
[0047]
The system controller 52 adjusts information (R, G) for obtaining a predetermined light emission amount or luminance based on the read brightness information, exposure information, light emission amount, light emission luminance and other setting information relating to light emission. , B current information supplied to each LED) is output to the voltage variable circuit 42.
[0048]
Next, when the user fully presses the shutter release button 102 and inputs an imaging instruction, the camera 100 opens the shutter based on the instruction from the central processing unit 138 and starts imaging. The central processing unit 138 outputs light emission information (information for instructing light emission of the semiconductor light emitting means) to the system controller 52 in synchronization with the timing at which the shutter is opened. The system controller 52 that has acquired the light emission information outputs a light emission instruction signal to the control circuit (transistor in the example shown in FIG. 3) of each semiconductor light emitting means. As a result, the auxiliary light having the brightness and light amount set from the semiconductor light emitting element 38 is emitted.
[0049]
The relationship between the distance to the main subject image and the amount of light emitted by the light emitting device 146 at that time may be created and recorded in the ROM 25 as a table. Further, a table or an arithmetic expression indicating the relationship between the voltage value output from the voltage variable circuit 42 and the light amount may be created, and the semiconductor light emitting element 38 may emit light by changing the light amount in synchronization with the shutter speed. Further, the shutter of the camera 100 may be opened in accordance with the timing at which the light emitting device 146 emits auxiliary light. Further, the control is the same as the above control, and only the target is measured by split photometry, and the process of stopping the light emission of the light emitting device 146 when the light quantity reaches a specified value or the process of closing the shutter of the camera 100 is performed. Good.
[0050]
In the above description, the embodiment in which the light emitting unit 146 is built in the camera 100 has been described. However, the present invention is not limited to this, and the light emitting unit 146 may be an independent light emitting device separate from the camera. The object of the present invention can be achieved. In that case, the transmission of information between the central processing unit provided in the camera and the system controller provided in a separate light-emitting device is a contact terminal of an accessory shoe provided in many cameras. It is good to carry out through. Also, the object of the present invention can be achieved by transmitting various types of information via a dedicated communication cable.
[0051]
FIG. 4 is a diagram showing the relationship between the exposure brightness of the camera and the light emission luminance emitted by the light emitting device when the slow shutter imaging is performed using the light emitting device according to the present invention.
[0052]
When the user instructs slow shutter imaging, the shutter starts to open from time T0, and from time T1, the semiconductor light emitting means starts light emission for the light emission time Tf in accordance with the exposure luminance. The exposure time Ts is defined as T0 to T4, and the light emission time Tf is defined as T1 to T3. In the figure, T0 and T1 and T4 and T5 are set at different times, but the present invention is not limited to this embodiment, and T0 and T1 and T4 and T5 are at the same time. Even if it exists, it becomes possible to achieve the objective of this invention. Also, T0 and T2, T1 and T2, T3 and T4, and T3 and T5 may be the same time. In any case, it is possible to emit auxiliary light for a time equivalent to the shutter speed.
[0053]
FIG. 5 is an image captured under the imaging conditions shown in FIG.
[0054]
As shown in the figure, the captured image is captured because the person is stationary, but the background train is moving (if the exposure time and emission time are 1/15 seconds) , About 0.8 to 1.5 m). Therefore, even when imaging is performed using auxiliary light, it is possible to depict the dynamic feeling of the slow shutter in the image.
[0055]
6 to 8 show the relationship between the current value supplied to the semiconductor light emitting element and the time.
[0056]
In the example shown in FIG. 6, the current value supplied to each of the R, G, and B semiconductor light emitting elements 38 is set to a constant current value during the light emission time Tf. This current value is set as a result of instructing the voltage variable circuit 42 by the supply current value calculated by the system controller 52 (supply current calculation means) based on the distance information to the subject and the brightness information of the subject. It is. The current value is determined based on the voltage output from the voltage variable circuit 42 and the resistance connected to each semiconductor light emitting element 38. In addition, each control circuit (transistor in the example shown in FIG. 3) of the semiconductor light emitting element 38 not only passes and blocks the current supplied to the semiconductor light emitting element 38, but also controls the current value supplied to the semiconductor light emitting element 38. It may be.
[0057]
In the example shown in FIG. 7, the current values supplied to the R, G, and B semiconductor light emitting elements 38 are constant, and the currents supplied to the semiconductor light emitting elements 38 by the control circuits of the semiconductor light emitting elements 38 are passed and blocked. The light emission luminance of each semiconductor light emitting element 38 is set. The supply current is passed and cut off by pulse driving that is repeated at a predetermined interval (duty ratio). Note that the light emission luminance of each semiconductor light emitting element 38 may be set by combining the pulse drive shown in FIG. 7 and the drive that varies the current value shown in FIG.
[0058]
In the example shown in FIG. 8, the light emission luminance of each semiconductor light emitting element 38 is adjusted by repeating light emission by pulse driving of each R, G, B color semiconductor light emitting element 38 and interruption of the light emission. Further, the object of the present invention can be achieved even when the driving shown in FIG. 8 and the driving for changing the current value shown in FIG.
[0059]
For example, assuming that the current flowing through the green semiconductor light emitting means is Ig, the light emission efficiency of the semiconductor light emitting means is ηg, the light emission pulse width is T0N, and the light emission cycle time is Tx, the amount of light Lg emitted by the green semiconductor light emitting means. Can be calculated by Lg = T0N × Ig × ηg × Tf / Tx.
[0060]
According to the present invention, a good image can be obtained by continuously emitting auxiliary light even during high-speed shutter imaging at or above the shutter speed of the X contact in a camera having a focal plane shutter mechanism. In the conventional flash-type light emitting device, at a high shutter speed at which the shutter of the focal plane shutter is not fully opened, the slit formed by the front curtain and the rear curtain of the shutter moves (1/90 depending on the capability of the focal plane shutter). (For about 1/250 seconds) The flash was emitted several times to respond. However, in the flash type light emitting device, since the light emission luminance cannot be set finely, there is a problem that imaging conditions such as the aperture of the aperture are limited.
[0061]
However, according to the present invention, the light emission brightness of the semiconductor light emitting means can be freely changed. Therefore, the light emission brightness can be changed at any shutter speed (when the shutter curtain slit width is set to a high speed shutter speed which is narrow). It is possible to set an appropriate light emission luminance for all apertures.
[0062]
The light emitting device according to the present invention is capable of continuously adjusting the light emission luminance of the auxiliary light from the slow shutter to the high speed shutter and tuned at high speed, as well as the main capacitor and its charging like the conventional flash light emitting device. Since there is no need to provide a means, it is possible to provide a small and inexpensive light emitting device.
[0063]
Note that according to the present invention, the light emitting device 146 can emit light only while the camera is performing exposure for capturing one frame of the moving image when capturing a moving image. The power consumption of 146 can be reduced.
[0064]
【The invention's effect】
As described above, according to the light emitting device of the present invention, when the information instructing the light emission is acquired, the semiconductor light emitting means continues to emit light for a predetermined time based on the exposure time of the camera. Even in such a case, it is possible to obtain a moving imaging effect due to the slow shutter.
[0065]
According to another aspect of the invention, when the information instructing light emission is acquired, the semiconductor light emitting unit emits light with a predetermined current based on the light emission amount or the light emission luminance to be emitted by the semiconductor light emitting unit. It is possible to freely adjust the amount of light emitted at the time of shutter imaging, and it is possible to obtain a dynamic imaging effect by the slow shutter even when the subject is dark.
[0066]
According to the present invention, when the information for instructing light emission is acquired, if the main subject exists near the camera based on the acquired information on the distance between the camera and the main subject, the light emission luminance is reduced and the main subject is reduced. Since the semiconductor light emitting means emits light with a current value that increases the light emission luminance or a duty ratio of the current when it is in the distance of the camera, the object of the subject when shooting a person in the vicinity of the camera Demonstrate anti-glare effect on people.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating a state in which slow shutter imaging is performed by a camera with a light emitting device.
FIG. 2 is a block diagram of a signal processing system of a camera with a light emitting device according to the present invention.
FIG. 3 is a block diagram of a signal processing system of a light emitting device built in the camera.
FIG. 4 is a diagram showing the relationship between the exposure brightness of a camera and the light emission luminance emitted from the light emitting device when slow shutter imaging is performed using the light emitting device according to the present invention.
5 is an image obtained by imaging under the imaging conditions shown in FIG.
FIG. 6 shows an example of a relationship between a current value supplied to a semiconductor light emitting element and time.
FIG. 7 shows another embodiment showing the relationship between the current value supplied to the semiconductor light emitting device and the time.
FIG. 8 shows another embodiment showing the relationship between the current value supplied to the semiconductor light emitting device and the time.
FIG. 9 is a diagram showing the relationship between the exposure brightness of a camera and the light emission luminance emitted from the light emitting device when slow shutter imaging is performed using a conventional light emitting device.
10 is an image obtained by imaging under the conventional imaging condition shown in FIG.
[Explanation of symbols]
25 ... ROM, 34 ... light receiving sensor, 38 ... semiconductor light emitting element, 40 ... battery, 42 ... voltage variable circuit, 52 ... system controller, 54 ... light control circuit, 56 ... temperature sensor, 100 ... camera, 110 ... photographing lens, DESCRIPTION OF SYMBOLS 112 ... Shutter / aperture, 114 ... Solid-state image sensor, 126 ... Digital signal processing circuit, 138 ... Central processing unit, 140 ... Camera operation part, 146 ... Light-emitting device

Claims (2)

An imaging means for capturing an image;
A photometric means for dividing and metering light from the subject;
Distance information acquisition means for acquiring information about the distance between the camera and the target;
Comprising a semiconductor light-emitting device of the light-emitting diode or an organic EL, when the slow shutter captured by the imaging means, the semiconductor acquires the information indicating the light emission of the light emitting means, before Symbol synchronized time the semiconductor light emitting unit to the shutter timing of the image pickup means Based on the information about the distance between the camera and the target acquired from the distance information acquisition unit , the light emission brightness is reduced when the target is close to the camera. A light emitting device that emits light from the semiconductor light emitting means at a current value that brightens the light emission luminance when the target is located far from the camera, or a duty ratio of the current;
When carrying out the slow shutter captured by the imaging unit, and photometric target by said photometry means, when the amount of light obtained from the target reaches a specified value, the control for executing the shutter closing processing before Symbol imaging means and means, the,
A camera characterized in that the semiconductor light emitting means continues to emit light for the exposure time of the camera during the slow shutter imaging .   2. The camera according to claim 1, wherein the light emitting device emits light from the semiconductor light emitting means at a predetermined current based on a light emission amount or light emission luminance to be emitted by the semiconductor light emitting means when acquiring information instructing light emission. .

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