JP2011142500A - Imaging apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an imaging apparatus that suppresses a heat release value due to emission of a light-emitting means. <P>SOLUTION: The imaging apparatus includes: an imaging means photographing a face of a driver of a vehicle; the light-emitting means that irradiates the face of the driver with light; a temperature detection means that detects temperature in the imaging means; and a control means that controls light-emission with a reduced current as temperature detected by the temperature detection means gets higher. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an imaging device, and more particularly to an imaging device that captures an image of the face of a driver of a vehicle.

  2. Description of the Related Art In recent years, a moving body such as an automobile is equipped with an image pickup device for picking up an image of a face in order to pick up an image of the surroundings of the vehicle and detect a driver's side look. As an example of such an image pickup apparatus, an in-vehicle camera auxiliary illumination device (hereinafter referred to as a conventional technique) described in Patent Document 1 is cited. In the prior art, an LED (Light Emitting Diode) is mounted as auxiliary illumination for imaging the rear of a vehicle with a CCD (Charge Coupled Device) camera. In the conventional technology, when the rear side of the vehicle is imaged by the CCD camera, the LED is not always turned on, but is repeatedly turned on and off in accordance with the timing of capturing the image of the CCD camera, thereby generating heat. The amount and power consumption are suppressed.

JP 2005-271836 A

  However, the above prior art has the following problems. That is, the vehicle travels in various environments where the ambient temperature changes, such as when traveling under hot weather or when traveling in a cold region. However, in the above-described conventional technology, the LED is repeatedly turned on and off based on the timing of capturing an image from the CCD camera without considering the ambient temperature. In some cases, the effects of heat generation on the surroundings cannot be suppressed.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide an imaging device capable of suppressing the amount of heat generated due to light emission of an LED.

In order to achieve the above object, the present invention has the following characteristics.
According to a first aspect of the present invention, there is provided an imaging unit that images a face of a driver of a vehicle, a light emitting unit that irradiates light on the driver's face, a temperature detection unit that detects a temperature inside the imaging unit, and a temperature detection unit. Control means for performing light emission control for causing the light emitting means to emit light with a current that is further decreased as the detected temperature becomes higher.

  The second invention is an invention subordinate to the first invention, wherein the operation guarantee temperature of the imaging means is not exceeded when the light emitting means is caused to emit light in association with the temperature detected by the temperature detecting means. And a storage means for storing a current table indicating a predetermined current magnitude so as to decrease as the temperature becomes higher, and a predetermined designated temperature. The light emitting means is caused to emit light with a current having a magnitude corresponding to the temperature detected by the detecting means by the current table.

  A third invention is an invention subordinate to the second invention, further comprising illuminance detection means for detecting illuminance around the driver's face, and the control means is a temperature detected by the temperature detection means. Is not lower than the specified temperature and the illuminance detected by the illuminance detection means is not higher than the predetermined illuminance, the light emission is controlled with the magnitude of the current associated with the current table.

  The fourth invention is an invention subordinate to the third invention, wherein the storage means associates a current value having a predetermined magnitude with a temperature equal to or lower than a specified temperature without considering the operation guarantee temperature. A current table further stored as the normal current is stored, and the control means performs light emission control for causing the light emitting means to emit light at the magnitude of the normal current when the temperature detected by the temperature detection means is equal to or lower than the specified temperature.

  The fifth invention is an invention subordinate to the fourth invention, wherein the light emission control is started when the ignition switch or accessory switch of the vehicle is turned on, and the temperature detected by the temperature detecting means is designated. After the temperature becomes lower than the temperature, the light emission means is caused to emit light with the magnitude of the normal current, and then the light emission control is terminated.

  A sixth invention is an invention dependent on the fifth invention, wherein the storage means uses the rated current of the light emitting means as a normal current as a current value having a predetermined magnitude without considering the operation guarantee temperature. Is stored as a current table.

  According to the first aspect of the invention, as the internal temperature of the imaging unit becomes higher, the amount of current flowing for causing the light emitting unit to emit light is adjusted to reduce the amount of light emission, and the light emission is performed. The accompanying calorific value can be suppressed. For example, it is possible to ensure good face recognition performance by turning on the light emitting means so that the heat generated by the light emission does not increase the temperature inside the imaging means and exceed the guaranteed operating temperature. it can.

  According to the second aspect of the invention, since the light emitting unit emits light with a current having a magnitude determined in advance by the current table, the light emitting unit can be controlled so that the temperature inside the imaging unit does not exceed the guaranteed operating temperature. .

  According to the third aspect of the present invention, even when the internal temperature of the image pickup means is a high temperature that is not lower than the specified temperature, the operation guaranteed temperature is exceeded while suppressing a decrease in accuracy when recognizing the driver's condition as much as possible. The camera 101 can be operated so that there is no such thing. According to the second aspect of the present invention, a face image that can recognize the state of the driver is captured even when the temperature inside the imaging means is a high temperature that is not lower than the specified temperature and the ambient illuminance including the driver is low. it can.

  According to the fourth aspect of the present invention, when the temperature inside the imaging means is equal to or lower than the specified temperature, the light emitting means can emit light by flowing a current having a magnitude irrespective of the guaranteed operating temperature.

  According to the fifth aspect of the present invention, even if the temperature inside the imaging means is a high temperature that is not lower than the specified temperature, the temperature inside the imaging means remains after the ignition switch or accessory switch of the vehicle is turned on. Light emission control can be continued until the temperature falls below the specified temperature.

  According to the sixth aspect of the present invention, when the temperature inside the image pickup means is equal to or lower than the specified temperature, the light emission means can be made to emit light with a rated current magnitude.

1 is a block diagram showing a schematic configuration of an imaging apparatus according to a first embodiment of the present invention. The front view of an example of the light emission imaging part of this invention The top view of an example of the light emission imaging part of this invention The figure which shows an example of the mounting position of the light emission imaging part of this invention The figure which shows an example of the current table of this invention The flowchart which shows the process of the control part which concerns on the 1st Embodiment of this invention. The block diagram which shows schematic structure of the imaging device which concerns on the 2nd Embodiment of this invention. The flowchart which shows the process of the control part which concerns on the 2nd Embodiment of this invention.

(First embodiment)
FIG. 1 is a diagram illustrating an example of a schematic configuration of an imaging apparatus 1 according to the first embodiment of the present invention. The imaging apparatus 1 according to the present embodiment includes a camera 101, a light source 102, a temperature sensor 103, and a control unit 104. In the description of the present embodiment, a case where the imaging device 1 captures an image of the face of a driver who drives the host vehicle will be described as an example.

  The camera 101 sequentially captures an image including the driver's face as a face image, and generates image data indicating the captured face image each time the face image is captured. The camera 101 is typically a near-infrared camera having relatively high sensitivity to light having a wavelength in the near-infrared region (hereinafter referred to as near-infrared light). The camera 101 may be a near-infrared camera that captures a face image with a charge coupled device (CCD) element or a complementary metal oxide semiconductor (CMOS) element.

  The light source 102 is installed in the vicinity of the camera 101 in the imaging direction of the camera 101 so that its optical axis and the optical axis (imaging direction) of the camera 101 are substantially parallel. The light source 102 according to the present embodiment includes an LED (Light Emitting Diode) that emits near-infrared light, and a current control circuit that supplies current to the LED with the magnitude of the LED current notified from the control unit 104 described later. It is mainly composed of. The LEDs constituting the light source 102 emit light with a light amount proportional to the magnitude of the current controlled by the current control circuit.

  2A and 2B are diagrams showing examples of the positional relationship between the camera 101 and the LEDs (hereinafter simply referred to as LEDs) that constitute the light source 102 according to the present embodiment. FIG. 2A is a front view of a light emitting imaging unit that incorporates the camera 101 and the LEDs that constitute the light source 102 as described above. 2B is a plan view of the light emitting imaging unit shown in FIG. 2A as viewed from above in the vertical direction. Note that FIG. 2B shows the imaging direction of the camera 101 and the irradiation direction of near-infrared light emitted from the LED for understanding the description.

  In this embodiment, as shown in FIG. 2A and FIG. 2B as an example, each of the four LEDs is built in the light emitting imaging unit so as to be positioned in the vicinity of both sides of the camera 101. In addition, as shown in FIG. 2B as an example, the camera 101 and the LED according to the present embodiment have optical axes that are substantially parallel to each other, and the imaging direction of the camera 101 and the irradiation direction of the LED substantially coincide. Built in the light emitting imaging unit.

  FIG. 3 is a diagram illustrating an example of a mounting location of the above-described light emitting imaging unit in the host vehicle. The light emitting imaging unit according to this embodiment is installed on the upper surface of the steering column of the host vehicle, as shown in FIG. 3 as an example. The light emitting imaging unit is installed toward the driver's seat so that a face image including the face of the driver seated in the driver's seat can be captured. By installing the light emitting imaging unit in this way, the camera 101 can capture a face image including the face of the driver of the host vehicle as described above. Since the camera 101 has high sensitivity to near-infrared light as described above, only the reflected light of the near-infrared light emitted from the LED is mainly received to capture a face image. Thereby, the camera 101 can capture a face image with reduced influence from disturbance light.

  The temperature sensor 103 is provided in a state of being floated upward at a predetermined interval from the surface of the substrate on which electronic components and the like configured inside the camera 101 are attached. The temperature sensor 103 sequentially detects the temperature inside the camera 101 and sequentially generates temperature information indicating the detected temperature. In the present embodiment, as described above, the camera 101 and the LED constituting the light source 102 are integrated and incorporated as a light emitting imaging unit, so that heat generated when the camera 101 operates and the LED emits light. Due to the heat generated by this, the temperature inside the camera 101 rises. Therefore, the imaging apparatus 1 according to the present embodiment detects the temperature inside the camera 101 using the temperature sensor 103.

  The control unit 104 acquires temperature information generated by the temperature sensor 103, and controls the current that flows through the LED based on the temperature indicated by the acquired temperature information. FIG. 4 is a diagram illustrating an example of a current table stored in a storage unit (not illustrated) by the control unit 104 according to the present embodiment.

  As shown in FIG. 4, the current table according to the present embodiment is a data table in which the temperature indicated by the temperature information and the LED current indicating the magnitude of the current flowing through the LED are associated with each other. The LED current indicated by the current table is, for example, the temperature inside the camera 101 that rises according to the amount of heat generated when a current having the magnitude indicated by the LED current is passed through the LED, and the operation of the camera 101 is guaranteed. It is predetermined so as to be the maximum size in a range not exceeding the temperature.

  In addition, the current table according to the present embodiment also includes an LED current indicating a normal current flowing through the LED when the temperature indicated by the temperature information is equal to or lower than a predetermined temperature. Is shown as Here, the normal current is a current having a magnitude determined as the rated current or the maximum current of the LEDs constituting the light source 102, and the vehicle interior of the host vehicle has an appropriate temperature as will be described later. Even if the current flowing through the LED is made to flow at a predetermined magnitude without considering the above-mentioned guaranteed operating temperature, such as the rated current or the maximum current, the temperature inside the camera 101 Is a current that flows when it is considered that the operation guaranteed temperature is not exceeded. Therefore, as described above, the specified temperature in the present embodiment does not exceed the operation guarantee temperature even if a current is passed at a predetermined magnitude without considering the operation guarantee temperature described above. It is good to predetermine as temperature which can be judged. The example shown in FIG. 4 shows a current table indicating that 49 ° is preset as the specified temperature, and a current of 3.0 A is passed as a normal current up to 49 °.

  In addition, the numerical value described in the current table shown in FIG. 4 is an example, and the LED current indicated by the current table is based on the results of simulations or experiments assuming various situations of the host vehicle. It may be an arbitrary numerical value determined in advance.

  The control unit 104 starts processing when the ignition switch or the accessory switch of the host vehicle is turned on, and whether or not the temperature indicated by the temperature information generated by the temperature sensor 103 is equal to or lower than the specified temperature. Determine whether. When the temperature indicated by the temperature information is not equal to or lower than the specified temperature, the control unit 104 refers to the LED current associated with the temperature by the current table and notifies the current control circuit configuring the photosource 102. On the other hand, when the temperature indicated by the temperature information is equal to or lower than the specified temperature, the control unit 104 refers to the LED current associated with the temperature as a normal current according to the current table, and controls the current that configures the light source 102. The circuit is notified and the process ends.

  Hereinafter, the flow of processing of the control unit 104 according to the present embodiment will be described with reference to the flowchart shown in FIG.

  The control unit 104 acquires temperature information generated by the temperature sensor 103 (step S101), and refers to the acquired temperature information to determine whether or not the temperature inside the camera 101 is equal to or lower than a specified temperature ( Step S102). When the temperature indicated by the temperature information is equal to or lower than the specified temperature (Yes in step S102), the control unit 104 recognizes the normal current with reference to the current table, and uses the recognized normal current as the LED current as the photocurrent. The current control circuit 102 is notified (step S103). On the other hand, when the temperature indicated by the temperature information is not equal to or lower than the specified temperature (No in step S102), the control unit 104 recognizes the LED current associated with the temperature indicated by the temperature information with reference to the current table. After notifying the current control circuit of the photon source 102, the process returns to step S101.

  The above is the description of the imaging device 1 according to the first embodiment of the present invention. For example, when the host vehicle is parked through a period when it is hot, the temperature inside the camera 101 attached to the upper surface of the steering column as described above may be a high temperature that is not lower than the specified temperature. is there. In such a case, when the ignition switch or accessory switch of the host vehicle is turned on and the camera 101 and the light source 102 are activated, heat is generated with the light emission of the LED, and the temperature inside the camera 101 is guaranteed to operate. The temperature may be exceeded. However, according to the imaging device 1 according to the present embodiment, when the ignition switch or the accessory switch of the host vehicle is turned on, the current determined in advance as described above in association with the temperature inside the camera 101. Is emitted to the LED so as not to exceed the guaranteed operating temperature of the camera 101 while suppressing the amount of heat generated by the light emission of the LED. Therefore, after the ignition switch or the accessory switch of the own vehicle is turned on, the air conditioning system of the own vehicle such as an air conditioner is activated, and the room temperature in the vehicle interior of the own vehicle becomes an appropriate temperature (for example, the above specified temperature or less). Without waiting for the camera 101 and the light source 102 to be operated when the ignition switch or the accessory switch of the host vehicle is turned on.

  For example, the face image captured by the imaging apparatus 1 according to the present embodiment recognizes the face of the driver (face recognition) based on the face image, and the driver is in a dangerous state (such as a side-by-side state or a doze state). Can be used by a conventionally well-known technique for recognizing. And according to the imaging device 1 which concerns on this embodiment, as mentioned above, without waiting for the room temperature of the vehicle interior of the own vehicle to become suitable temperature (for example, below the above-mentioned designated temperature), relatively early time Thus, the driver's face image can be captured, and it can be determined whether or not the driver is in a dangerous state based on the face image.

  Further, as described above, the LED current indicated by the current table in the imaging apparatus 1 according to the present embodiment rises when the current having the magnitude indicated by the LED current is supplied to the LED. Is predetermined so as to be the maximum in a range not exceeding the above-mentioned guaranteed operating temperature. For this reason, according to the imaging device 1 according to the present embodiment, the LED can be turned on with the maximum light amount in a range that does not exceed the guaranteed operating temperature, and good face recognition performance is ensured without exceeding the guaranteed operating temperature. can do.

  Further, in the imaging device 1 according to the present embodiment, the LED is turned on while controlling the current flowing through the LED even during a period from when the temperature is not higher than the specified temperature to when the temperature reaches the normal temperature not higher than the specified temperature. Therefore, in the imaging device 1 according to the present embodiment, when recognizing the dangerous state of the driver as described above, it is possible to always ensure the minimum required face recognition accuracy.

  In the description of the first embodiment described above, as illustrated in FIG. 1, as an example, the imaging device 1 configured to cause a processing unit (not illustrated) to acquire image data indicating a face image captured by the camera 101 is used. explained. However, the control unit 104 according to the present embodiment can execute a desired process on the above-described image data in parallel with the process described in this embodiment, and can perform a desired process on the image data in parallel. The unit 104 may be configured to acquire image data.

(Second Embodiment)
FIG. 6 is a block diagram showing a schematic configuration of the imaging apparatus 2 according to the second embodiment of the present invention. The imaging device 2 according to the present embodiment is different from the imaging device 1 according to the first embodiment in that an illuminance sensor 105 is further provided. Therefore, in the description of the present embodiment, only differences from the imaging device 1 according to the first embodiment will be described, and the description of the same points will be omitted because the description of the first embodiment is cited.

  The illuminance sensor 105 is typically a sensor that mainly includes a phototransistor or the like and detects the illuminance around the driver's face existing in the imaging range of the camera 101. The position where the illuminance sensor 105 is attached to the host vehicle may be any position as long as the illuminance around the driver's face included in the imaging range of the camera 101 can be detected as described above. The illuminance sensor 105 sequentially detects the illuminance around the driver, and sequentially generates illuminance information indicating the detected illuminance.

  The control unit 104 according to the present embodiment controls the magnitude of the current flowing through the LED based on the illuminance information generated by the illuminance sensor 105 as described above in addition to the temperature information generated by the temperature sensor 103. .

  More specifically, the control unit 104 according to the present embodiment acquires illuminance information from the illuminance sensor 105 when the temperature indicated by the temperature information is not equal to or lower than the specified temperature described in the first embodiment. The control unit 104 according to this embodiment has a predetermined illuminance set in advance. The designated illuminance is determined in advance in order to determine whether or not a face image can be captured with an image quality necessary for recognizing the driver's state as described in the first embodiment without causing the LED to emit light. Is the illuminance. When the illuminance information is acquired, the control unit 104 determines whether or not the illuminance indicated by the acquired illuminance information is greater than or equal to the specified illuminance. When it is determined that the illuminance indicated by the acquired illuminance information is greater than or equal to the specified illuminance, the control unit 104 generates an LED current indicating that the LED does not emit light, that is, a current of approximately zero magnitude as the first current. The LED current indicated as a value is notified to the current control circuit of the light source 102.

  On the other hand, when determining that the illuminance indicated by the acquired illuminance information is not equal to or greater than the specified illuminance, the control unit 104 notifies the current control circuit of the photosource 102 of the LED current indicating the second current value. Here, the second current value in the present embodiment will be described. When the illuminance indicated by the illuminance information is not equal to or greater than the specified illuminance, the face image cannot be captured with the image quality necessary for recognizing the state of the driver as described in the first embodiment unless the LED is caused to emit light. Is the time. In addition, as described above, the control unit 104 according to the present embodiment acquires the illuminance information when the temperature indicated by the temperature information is a high temperature that is not lower than the specified temperature. For this reason, the second current value in the present embodiment suppresses the temperature rise inside the camera 101 caused by causing the LED to emit light as much as possible, and the state of the driver as described in the first embodiment. Is determined in advance so as to be compatible with increasing the light emission amount of the LED to the extent that the face recognition performance as good as possible can be secured. It is assumed that the second current value in this embodiment is determined in advance by simulation or experiment so as to have such a magnitude.

  Hereinafter, the flow of processing of the control unit 104 according to the present embodiment will be described with reference to the flowchart shown in FIG. In the process shown in the flowchart of FIG. 7, the process shown in the flowchart of FIG. 5 that is the same as that of the control unit 104 according to the first embodiment is given the same reference numeral, and the description thereof is omitted.

  When the temperature indicated by the temperature information is not equal to or lower than the specified temperature (No in step S102), the control unit 104 according to the present embodiment acquires illuminance information from the illuminance sensor 105, and the illuminance indicated by the acquired illuminance information is specified. It is determined whether or not it is greater than or equal to the illuminance (step S201). When the illuminance indicated by the illuminance information is greater than or equal to the specified illuminance (Yes in step S201), the control unit 104 notifies the current control circuit of the photosource 102 of the first current value described above (step S202) and performs processing. Is returned to step S101. On the other hand, when the illuminance indicated by the illuminance information is not equal to or greater than the specified illuminance (No in step S201), the control unit 104 notifies the current control circuit of the photogen 102 of the second current value described above (step S203). The process returns to step S101.

  The above is the description of the imaging device 2 according to the second embodiment of the present invention. According to the imaging device 2 according to the present embodiment, even when the temperature inside the camera 101 is a high temperature that is not lower than the specified temperature, the accuracy of the driver's state is reduced when the driver's state is recognized (for example, the above-described face recognition). The camera 101 can be operated so as not to exceed the guaranteed operating temperature while suppressing as much as possible. Further, according to the imaging device 2 according to the present embodiment, the face that can recognize the driver's state even when the temperature inside the camera 101 is a high temperature that is not lower than the specified temperature and the ambient illuminance including the driver is low. An image can be taken.

  Further, for example, when a traveling vehicle enters a relatively dark place such as a tunnel from a place where the surroundings are relatively bright such as daytime, the illuminance around the driver's face instantaneously decreases. Even in such a case, according to the imaging device 2 according to the second embodiment, the temperature inside the camera 101 is guaranteed to operate based on the temperature inside the camera 101 and the ambient illuminance including the driver's face. A face image with good image quality can be taken without exceeding the temperature.

  Note that the control unit 104 according to the second embodiment does not refer to the current table unlike the control unit 104 according to the first embodiment. Therefore, the control unit 104 according to the second embodiment determines the magnitude of the normal current to be notified when performing the process of step S103 in the process illustrated in the flowchart of FIG. It shall be.

  In addition, as the illuminance sensor 105 according to the second embodiment, for example, when a system that detects the illuminance outside the vehicle and automatically controls the illuminance of the headlight according to the detected illuminance is mounted on the host vehicle. The illuminance around the face may be estimated based on the illuminance outside the vehicle, for example, by using a sensor mounted in the system.

  In the second embodiment, the current table is not referred to. However, in another embodiment, as an example, the second predetermined as described above according to the temperature inside the camera 101 is used. A second current indicated by the current table in association with the temperature indicated by the temperature information when the illuminance indicated by the illuminance information is not equal to or greater than the specified illuminance. An imaging device that combines the first embodiment and the second embodiment such that the value is notified to the current control circuit of the light source 102 may be employed.

  In the second embodiment, a current value of approximately zero is predetermined as the first current value. However, in another embodiment, an LED that does not increase the temperature inside the camera 101 is used. The magnitude of any current corresponding to the amount of emitted light may be determined in advance as the first current value.

  When a camera capable of controlling exposure is used as the camera 101, the camera exposure value is detected instead of the illuminance sensor 105 according to the second embodiment, and the camera is imaged based on the detected exposure value. You may use the process part which estimates the illumination intensity of a range.

  According to the present invention, the internal temperature of the camera can be controlled so as not to exceed the guaranteed operating temperature. For example, an imaging device used in an apparatus that recognizes the state of an operator who operates a moving body such as a vehicle based on an image Available to:

DESCRIPTION OF SYMBOLS 1, 2 Imaging device 101 Camera 102 Photogen 103 Temperature sensor 104 Control part 105 Illuminance sensor

Claims (6)

Imaging means for imaging the face of the driver of the vehicle;
Light emitting means for irradiating light on the driver's face;
Temperature detecting means for detecting the temperature inside the imaging means;
An imaging apparatus comprising: control means for performing light emission control for causing the light emitting means to emit light with a current that is further decreased as the temperature detected by the temperature detecting means becomes higher. Corresponding to the temperature detected by the temperature detecting means, the light emitting means emits light in advance so that it does not exceed the guaranteed operating temperature of the imaging means so as to decrease as the temperature increases. A storage means for storing a current table indicating the magnitude of the determined current and a predetermined designated temperature;
The imaging apparatus according to claim 1, wherein the control unit causes the light emitting unit to emit light with the current having a magnitude associated with the temperature detected by the temperature detecting unit by the current table. Illuminance detection means for detecting the illuminance around the driver's face is further provided,
The control means responds by the current table when the temperature detected by the temperature detecting means is not lower than the specified temperature and the illuminance detected by the illuminance detecting means is not higher than a predetermined specified illuminance. The imaging apparatus according to claim 2, wherein the light emission control is performed based on the magnitude of the attached current. The storage means stores the current table further indicating a current value of a predetermined magnitude without considering the operation guarantee temperature as a normal current associated with a temperature equal to or lower than the specified temperature,
The imaging device according to claim 3, wherein the control unit performs the light emission control to cause the light emitting unit to emit light at the magnitude of the normal current when the temperature detected by the temperature detection unit is equal to or lower than the specified temperature. .   The light emission control is started when an ignition switch or an accessory switch of the vehicle is turned on, and after the temperature detected by the temperature detecting means becomes equal to or lower than the specified temperature, the magnitude of the normal current is The imaging apparatus according to claim 4, wherein the light emission control is terminated after the light emitting unit emits light.   The said storage means memorize | stores the said current table which shows the rated current of the said light emission means as said normal current as an electric current value of a predetermined magnitude | size without considering the said operation | movement guarantee temperature. Imaging device.

Images