JP2001257921A - Digital camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a digital camera which can increase the luminance of a light source for auxiliary light to be used for a display device as much as possible and can prevent deterioration as much as possible with a configuration small in occupancy space and low in cost. SOLUTION: This digital camera is provided with an LCD display part 122, an auxiliary optical lamp 123 for emitting the auxiliary light of the LCD display part 122, an auxiliary optical lamp driving circuit 124 for driving the auxiliary optical lamp 123 by supplying power, a temperature sensor 140 for detecting a temperature and a controller 121 for controlling the luminance of the auxiliary optical lamp by controlling the auxiliary optical lamp driving circuit 124 on the basis of the detected result of the temperature sensor 140. The temperature sensor 140 is used also for controlling the temperature of an LED lamp 142 or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a digital camera, and more particularly, to a digital camera provided with a display device using auxiliary light.

[0002]

2. Description of the Related Art Conventionally, fluorescent tubes have been used as illumination means for LCDs. The fluorescent tube for the LCD illumination needs to be driven at a high pressure in order to increase the brightness at the same time as being small. For this reason, a special circuit for high voltage, that is, an inverter for generating high voltage is required, and further, an inverter transformer, parts considering high voltage, and a PCB pattern are required. is there.

In order to solve the above-mentioned problem of the fluorescent tube, lighting means using a white LED has been devised. White LE
In D, since the brightness is small by itself, in order to increase the brightness, increase the number of LEDs as much as possible.
For example, a method of increasing the input power by the number of the input powers can be considered.

[0004] Since the above-mentioned method requires a large cost space, it is advantageous to increase the input voltage by the above-mentioned method. However, in the method described above, there is a possibility that a problem such as deterioration of the durability of the LED may occur at a high temperature.

[0005] Hereinafter, a technique related to the illumination of an LCD that has been conventionally proposed will be described. For example, Japanese Utility Model Laid-Open No. 5-55187
In the liquid crystal display device disclosed in Japanese Patent Application Laid-Open No. H10-209, a liquid crystal display device having a structure in which a backlight (fluorescent tube) is arranged on the back surface of a liquid crystal panel is equipped with a temperature sensor attached to the liquid crystal panel and measuring the temperature, A system memory with a dimmer table for dimming that limits the maximum value of the duty ratio of the dimming pulse output, an analog device that inputs the LCD panel temperature measured by the backlight brightness adjustment means and the temperature sensor and converts it into a digital signal. A control comprising a digital conversion circuit and a microprocessor having a function of subjecting an input signal to predetermined arithmetic processing of data in a system memory or performing an arithmetic operation based on a signal of a luminance adjusting means and outputting the result as a control signal Circuit and
A dimming circuit controlled by a control signal from the control circuit;
There is disclosed a technology including an inverter circuit that drives a backlight with a dimming circuit.

In the flat fluorescent lamp disclosed in Japanese Utility Model Laid-Open No. 5-43129, in a flat fluorescent lamp used as a backlight of a liquid crystal display device, a liquid crystal panel is brought into contact with the front surface and a nearby conductor is placed on the rear surface. A light emitting unit, a driving circuit printed circuit board disposed on the rear surface side of the light emitting unit, and a light receiving element disposed on a side surface of the light emitting unit, and a driving circuit of the light emitting unit based on an output signal of the light receiving element. A technique for controlling and adjusting the luminance is disclosed.

[0007] Recently, a camera equipped with a temperature sensor is also known. For example, in the "camera with a battery check device" disclosed in Japanese Utility Model Laid-Open No. 5-34383, a battery check is performed based on voltage data from the voltage detector, a temperature detector that detects a temperature, and a temperature detector that detects a temperature. Control means for performing a warning when the value of the voltage of the power supply is equal to or less than a predetermined value as a result of the battery check, wherein the control means controls the temperature detected by the temperature detection means to be equal to or less than the predetermined temperature. At this time, there is disclosed a technique for continuously performing a battery check at predetermined intervals based on voltage data.

[0008]

However, the "liquid crystal display device" disclosed in Japanese Utility Model Laid-Open No. 5-55187 has a problem that it contributes to the stabilization of luminance but cannot control the temperature, so that it is difficult to drive at the maximum power. There is. In addition, actual Kaihei 5
In the "flat fluorescent lamp" of JP-A-43129, LC
Although a temperature sensor is attached to the D panel, this method has a problem that it is difficult to use it for temperature compensation of the distance measuring means due to heat generation. In addition, 5-343
No. 83, "Camera with battery check device" has a configuration in which a temperature sensor is used only for the battery check, and thus there is a problem that power control of a temperature-dependent auxiliary light lamp or the like cannot be performed.

SUMMARY OF THE INVENTION The present invention has been made in view of the above, and has a space-saving and low-cost configuration to increase the brightness of an auxiliary light source used in a display device as much as possible and to minimize deterioration. It is an object of the present invention to provide a digital camera capable of preventing a digital camera.

[0010]

According to a first aspect of the present invention, there is provided a digital camera having a display device using an auxiliary light, the light source emitting the auxiliary light, Light source driving means for supplying and driving electric power, temperature detecting means for detecting a temperature, control means for controlling the light source driving means based on the detection result of the temperature detecting means to adjust the brightness of the light source, And the temperature detecting means is also used for other controls.

According to the above invention, the light source driving means supplies power to and drives the light source which emits auxiliary light of the display device, the temperature detecting means detects the temperature, and the control means based on the detection result of the temperature detecting means. By controlling the light source driving means to adjust the brightness of the light source, the temperature detecting means is also used for other controls.

[0012] The invention according to claim 2 is based on claim 1.
In the present invention, the display device is an LCD. According to the above invention, the LCD is used as a display device.

[0013] The invention according to claim 3 is based on claim 1.
According to the invention, the light source is an LED. According to the above invention, an LED is used as a light source.

[0014] The invention according to claim 4 is based on claim 1.
In the invention according to any one of the first to third aspects, the temperature detecting means is disposed substantially near a distance measuring means for measuring a distance to a subject. According to the above invention, the temperature detecting means is disposed substantially near the distance measuring means for measuring the distance to the subject.

The invention according to claim 5 is the invention according to claim 4.
In the invention according to the above, the control means corrects the temporal and positional deviation of the detection result of the temperature detection means,
The light source driving means is controlled to adjust the brightness of the light source. According to the invention, the control means corrects the temporal and spatial deviation of the detection result of the temperature detecting means, and controls the light source driving means to adjust the brightness of the light source based on the corrected detection result.

The invention according to claim 6 is the invention according to claim 4.
Alternatively, in the invention according to claim 5, further comprising: a second light source that emits auxiliary light to the distance measuring unit;
And a second light source driving unit that supplies power to and drives the second light source, and wherein the control unit controls the second light source driving unit based on a detection result of the temperature detection unit to control the second light source. The brightness of the light source is adjusted.

According to the invention, the second light source driving means supplies power to the second light source which emits auxiliary light to the distance measuring means to drive the second light source. The brightness of the second light source is adjusted by controlling the second light source driving means based on the second light source driving means.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a digital camera according to the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 is a block diagram of a digital camera according to the present invention. In FIG. 1, reference numeral 100 denotes a digital camera. The digital camera 100 includes a lens system 101, a mechanical mechanism 102 including an aperture / filter unit, and the like.
CCD 103, CDS circuit 104, variable gain amplifier (A
GC amplifier) 105, A / D converter 106, IPP10
7, DCT108, coder 109, MCC110, D
RAM 111, PC card interface 112, controller 121, LCD display unit 122, auxiliary light lamp 123, auxiliary light lamp drive circuit 124, operation unit 125,
SG (control signal generation) unit 126, strobe device 127,
Battery 128, DC-DC converter 129, flash memory 130, focus driver 131, pulse motor 132, zoom driver 133, pulse motor 1
34, a motor driver 135, a temperature sensor 140, a distance measurement sensor 141, an LED lamp 142, and an LED lamp drive circuit 143. Also, PC
PC detachable via card interface 112
Card 150 is connected.

The lens unit includes a mechanical system 102 including a lens system 101, a diaphragm and a filter unit, and the mechanical shutter of the mechanical system 102 performs simultaneous exposure of two fields. The lens system 101 is formed of, for example, a varifocal lens, and includes a focus lens system 101a and a zoom lens system 101b.

The focus driver 131 is connected to the CPU 12
1 according to the control signal supplied from the
2 to move the focus lens system 101a in the optical axis direction. The zoom driver 133 includes a CPU 121
Pulse motor 134 according to a control signal supplied from
To move the zoom lens system 101b in the optical axis direction. In addition, the motor driver 135 includes the CPU 121
The mechanical mechanism 102 is driven in accordance with a control signal supplied from the controller, and for example, an aperture value of the aperture is set.

The CCD (Charge Coupled Device) 103 converts an image input through the lens unit into an electric signal (analog image data). The CDS (correlated double sampling) circuit 104 is a circuit for reducing noise in the CCD type image pickup device.

The AGC amplifier 105 corrects the level of the signal correlated double-sampled by the CDS circuit 104. The gain of the AGC amplifier 105 is determined by the CPU 1
According to 21, the setting data (control voltage) is set in the AGC amplifier 105 via the D / A converter built in the AGC amplifier 105. Further, the A / D converter 106 converts analog image data input from the CCD 103 via the AGC amplifier 105 into digital image data. That is, the output signal of the CCD 103 is transmitted to the CDS circuit 104 and the AGC amplifier 105.
And the A / D converter 106 converts the digital signal into a digital signal at an optimum sampling frequency (for example, an integral multiple of the subcarrier frequency of the NTSC signal).

The digital signal processor IPP
(Image Pre-Processor) 107, DCT (Discrete Cos
ine Transform) 108 and coder (Huffman Enco
A der / Decoder) 109 performs various processes on the digital image data input from the A / D converter 106 into color difference (Cb, Cr) and luminance (Y), and performs data processing for correction and image compression / decompression. Apply. The DCT 108 and the coder 109 perform, for example, orthogonal transformation / inverse orthogonal transformation, which is a process of image compression / decompression conforming to JPEG, and JPEG
Huffman coding, which is a process of image compression and decompression based on
Perform decryption and the like.

Further, an MCC (Memory Card Controlle)
r) 110, temporarily stores the compressed image and stores the compressed image in the PC card 150 via the PC card interface 112.
Or read from the PC card 150.

The LCD display unit 122 displays image data, operation menus, and the like. The auxiliary light lamp 123 is an LCD
A front light for illuminating the display unit 122,
For example, it consists of a white LCD. Auxiliary light lamp drive circuit 12
4 outputs a drive current to the auxiliary light lamp 123 under the control of the controller 121 to turn on the auxiliary light lamp 123. The controller 121 controls the drive current output from the auxiliary light lamp drive circuit 124 to the auxiliary light lamp 123 based on the temperature detected by the temperature sensor 140, as described later, to reduce the brightness of the auxiliary light lamp 123. Control.

The operation unit 125 includes a release key for giving a photographing instruction, a power switch, an LCD switch, an auxiliary light lamp switch, and buttons for externally performing function selection and other various settings.

The distance measuring sensor 141 is composed of, for example, an active distance measuring sensor. The distance from the object is measured based on the light emitted from the LED lamp 142 and reflected by the object, and the detection result is obtained. Controller 1
21. This distance measuring sensor 141 is used at the time of AF control. The LED lamp driving circuit 143 controls the LED lamp 142 based on the control of the controller 121.
And the LED lamp 142 is turned on. The controller 121 controls the drive current output from the LED lamp drive circuit 143 to the LED lamp 142 based on the temperature detected by the temperature sensor 140, and controls the brightness of the LED lamp 142.

The temperature sensor 140 is a distance measuring sensor 14.
1, and detects the temperature and outputs the detected temperature to the controller 121. The strobe circuit 114 emits strobe light under the control of the controller 121. The battery 128 is used as a camera power supply, and includes, for example, a nickel metal hydride battery, a lithium ion battery, a nickel cadmium (NiCd) battery, an alkaline battery, and the like, and is provided inside the digital camera 100 via the DC-DC converter 129. Supplied. The DC-DC converter 129 has a built-in switch circuit for turning on / off various power supplies output to the inside of the digital camera under the control of the controller 121.

The controller 121 includes a CPU, a ROM,
The RAM comprises a RAM, and in accordance with an instruction from the operation unit 125 or an external operation instruction such as a remote controller (not shown),
In accordance with the control program stored in M, the entire device of the digital camera 100 is controlled using the RAM as a work area. Specifically, the controller 121
Controls an imaging operation, an automatic exposure (AE) operation, an automatic white balance (AWB) adjustment operation, an AF operation, and the like.

The controller 121 performs control based on the detection result of the temperature sensor 140 when performing various controls. For example, the controller 121 changes the check voltage of the battery 128 based on the detection result of the temperature sensor 140, and also changes the driving current of the auxiliary light lamp 123 and the LED lamp 142 to the detection result of the temperature sensor 140 as described above. Control based on.

The controller 121 includes a recording mode for recording image data obtained by capturing an image of a subject on the PC card 150, a display mode for displaying image data recorded on the PC card 150, and a monitoring mode for capturing the captured monitoring image. A monitoring mode for directly displaying on the LCD display unit 122 is provided.

Various parameters and data of the digital camera are recorded in the flash memory 130. For example, a temperature-current table shown in FIG. 2 and a temperature correction table shown in FIG. 3 are stored as data. FIG. 2 is a diagram illustrating an example of the temperature-current table. This temperature-current table is used when the controller 121 calculates the drive current of the auxiliary light lamp (white LED) 123. In the figure, the horizontal axis represents the temperature, and the vertical axis represents the drive current of the auxiliary light lamp 123 appropriate (to obtain the maximum luminance) with respect to the temperature. As shown in the figure, when the temperature rises, the driving current for obtaining the maximum brightness of the auxiliary light lamp 123 decreases. On the other hand, even if the temperature rises, the auxiliary light lamp 12
3 will be degraded. In the present embodiment, even if the temperature rises using this temperature-current table,
The maximum brightness of the auxiliary light lamp 123 is obtained, and the auxiliary light lamp 123 is prevented from being deteriorated.

FIG. 3 shows an example of the temperature correction table. This temperature correction table is used by the controller 121 for temperature correction when calculating the drive current of the auxiliary light lamp 123. As described above, the temperature sensor 140
Since it is arranged near the distance measuring sensor 141, the temperature detected by the temperature sensor 140 and the auxiliary light lamp 123
Are different in the vicinity of. Further, in the vicinity of the auxiliary light lamp 123, when the auxiliary light lamp 123 is turned on, the temperature rises with time. Therefore, the temperature sensor 140
This temperature correction table is used to correct the positional and temporal deviations of the temperature measured in. In the figure, the horizontal axis represents time, and the vertical axis represents the temperature in the vicinity of the auxiliary light lamp 123. The temperature measured by the temperature sensor 140 as a start temperature is the time when the auxiliary light lamp 123 is turned on. A temperature rise in the vicinity of the auxiliary light lamp 123 over time is shown. Although FIG. 3 shows only the temperature rise near the auxiliary light lamp 123 when the start point is set to a certain temperature, the temperature correction table shows a plurality of start temperatures (for example, 0 ° C. to 40 ° C.). The temperature rise near the auxiliary light lamp 123 is recorded. Further, as shown in the figure, when a certain time has elapsed after the auxiliary light lamp 123 is turned on, the heat generation of the auxiliary light lamp 123 and the heat generation of the case are balanced, and the temperature near the auxiliary light lamp 123 becomes the equilibrium temperature. Become.

Next, control of the driving current of the auxiliary light lamp 123 in the digital camera having the above configuration will be described.
FIG. 4 is a flowchart illustrating the control of the driving current of the auxiliary light lamp 123 of the LCD display unit 122.

In FIG. 4, when the power switch of the operation unit 125 is turned on (step S1), the controller 121 causes the temperature sensor 140 to start detecting the temperature, and the temperature sensor 140 sends the detected temperature to the controller 121. Output (Step S2). Temperature sensor 14
0 outputs the temperature detected at predetermined time intervals to the controller 121 while the power is on.

When the LCD switch of the operation unit 125 is turned on (step S3), the display of a monitoring image on the LCD display unit 122 is started (step S4).
When the auxiliary light lamp switch of the operation unit 125 is turned on (step S5), the controller 121 refers to the temperature-current table (see FIG. 2) stored in the flash memory 130 and controls the temperature sensor 140. An auxiliary light lamp driving current corresponding to the detected temperature is calculated (step S6). Then, the controller 121 uses the calculated auxiliary light lamp driving current to generate the auxiliary light lamp driving circuit 1.
24 drives the auxiliary light lamp 123 (step S
7). Thus, the auxiliary light lamp 123 is driven by the auxiliary light lamp drive current calculated by the controller 121 to be turned on.

Further, the controller 121 starts measuring the time after the auxiliary light lamp 123 is turned on (step S8). Next, the auxiliary light lamp switch is turned off.
It is determined whether or not the auxiliary light lamp switch has been turned off (step S9). If the auxiliary light lamp switch has been turned off, the flow ends. If the auxiliary light lamp switch has not been turned off, the process proceeds to step S10. Then, with reference to the temperature correction table (see FIG. 3) stored in the flash memory 130, the temperature near the auxiliary light lamp 123 corresponding to the measured time after the auxiliary light lamp 123 is turned on is calculated. .

Subsequently, the controller 121 refers to the temperature-current table (see FIG. 2) stored in the flash memory 130 and calculates the calculated auxiliary light lamp 1.
An auxiliary light lamp driving current corresponding to the temperature near 23 is calculated (step S11). And the controller 12
1 causes the auxiliary light lamp drive circuit 124 to change the auxiliary light lamp drive current to the auxiliary light lamp drive current calculated in step S11.
The auxiliary light lamp 1 is calculated based on the auxiliary light lamp drive current calculated in step 11.
23 is driven (step S12). Thereafter, the process proceeds to step S9, and the processes of steps S10 to S12 are repeatedly performed until the auxiliary light lamp switch of the operation unit 125 is turned off. Thereby, the auxiliary light lamp 12
When the temperature near 3 increases, the auxiliary light lamp 123 can be prevented from deteriorating by lowering the auxiliary light lamp drive current.

As described above, in the present embodiment, the temperature sensor 140 used for controlling the temperature of the LED lamp 142 and the battery 128 is also used for controlling the auxiliary light lamp 123 of the LCD display unit 122. Therefore, the temperature of the auxiliary light lamp 123 can be controlled, and the space and cost can be reduced. In addition, since the temperature of the auxiliary light lamp 123 is controlled, it is possible to increase the luminance as much as possible while preventing deterioration in durability. This makes it possible to reduce the number of LEDs and improve visibility.

In this embodiment, since the LCD is used as the display device, the space can be further reduced. In addition, white LE as an auxiliary light lamp
Since D is used, further space saving and cost reduction are possible.

In this embodiment, since the temperature sensor 140 is disposed substantially near the distance measuring sensor 141, the temperature of the outside air can be measured almost without being affected by heat generation. , Accurate temperature can be measured.

In this embodiment, the positional and temporal deviation between the detection result of the temperature sensor 140 and the temperature in the vicinity of the auxiliary light lamp 123 is corrected by the temperature correction table. Auxiliary light lamp 12
3 can be controlled.

In the present embodiment, the LED lamp 142 for the distance measuring sensor 141 is
Since the control is performed based on the detection result of 0, it is possible to improve the ranging accuracy of the ranging sensor 141.

It should be noted that the present invention is not limited to the above-described embodiment, and can be carried out with appropriate modifications without departing from the spirit of the invention.

[0046]

As described above, in order to solve the above-mentioned problems, according to the digital camera of the first aspect, the light source driving means supplies power to and drives the light source which emits auxiliary light of the display device. The temperature detecting means detects the temperature, the control means controls the light source driving means based on the detection result of the temperature detecting means to adjust the brightness of the light source, and uses the temperature detecting means for other controls. Therefore, it is possible to provide a digital camera capable of increasing the luminance of the light source of the auxiliary light used in the display device as much as possible and preventing deterioration as much as possible with a space-saving and low-cost configuration.

According to the digital camera of the second aspect, in the digital camera of the first aspect,
Since the CD is used as the display device, it is possible to further save the space in addition to the effect of the digital camera according to the first aspect.

According to the digital camera of the third aspect, in the digital camera of the first aspect, L
Since the ED is used as the light source, in addition to the effect of the digital camera according to the first aspect, further space saving and cost reduction can be achieved.

According to the digital camera of the fourth aspect, in the digital camera of any one of the first to third aspects, the digital camera of any one of the first to third aspects is provided. In addition to the effect described above, since the temperature detecting means is arranged substantially in the vicinity of the distance measuring means for measuring the distance to the subject, the temperature detecting means is hardly affected by heat generation.
Almost the temperature of the outside air can be measured, and an accurate temperature can be measured.

According to the digital camera of the fifth aspect, in the digital camera of the fourth aspect, the control means corrects the time and location deviation of the detection result of the temperature detection means, and performs the corrected detection. Based on the result, the light source driving means was controlled to adjust the brightness of the light source,
In addition to the effect of the digital camera according to the fourth aspect, more accurate temperature control of the light source can be performed.

The invention according to claim 6 is based on claim 4.
Alternatively, in the invention according to claim 5, according to the invention, the second light source driving unit supplies power to and drives the second light source that emits auxiliary light to the distance measuring unit, and the control unit includes:
Since the brightness of the second light source is adjusted by controlling the second light source driving means based on the detection result of the temperature detecting means, in addition to the effects of the invention according to claim 4 or 5, Distance accuracy can be improved.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration example of a digital camera according to an embodiment.

FIG. 2 is a diagram illustrating an example of a temperature-current table.

FIG. 3 is a diagram illustrating an example of a temperature correction table.

FIG. 4 is a flowchart illustrating control of a driving current of an auxiliary light lamp of an LCD.

[Explanation of symbols]

 REFERENCE SIGNS LIST 100 Digital camera 101 Lens system 101 a Focus lens system 101 b Zoom lens system 102 Mechanical mechanism including autofocus 103 CCD (charge coupled device) 104 CDS (correlated double sampling) circuit 105 Variable gain amplifier (AGC amplifier) 106 A / D Transducer 107 IPP (Image Pre-Processor) 108 DCT (Discrete Cosine Transform) 109 Coder (Huffman Encoder / Decoder) 110 MCC (Memory Card Controller) 111 RAM (Internal Memory) 112 PC Card Interface 121 Controller 122 LCD Display 123 Assist Light lamp 124 Auxiliary light lamp drive circuit 125 Operation unit 126 SG unit 127 Strobe 128 Battery 129 DC-DC converter 130 EEPROM 131 Focus driver 132 Pal Smart motor 133 Zoom driver 134 Pulse motor 135 Motor driver 136 External AF sensor 140 Temperature sensor 141 Distance measuring sensor 142 LED lamp 143 LED lamp drive circuit 150 PC card

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G09G 3/20 680 G09G 3/34 J 3/34 3/36 3/36 H04N 5/235 H04N 5/235 G02F 1/1335 530 F-term (reference) 2H091 FA45Z FD02 FD12 FD22 LA03 LA18 MA10 2H093 NC02 NC42 NC49 NC57 NC90 ND08 ND39 NE10 NG20 5C006 AF62 AF78 BB11 BF38 EA01 FA19 5C022 AA13 AB15 AC01 AC69 AC30 EB DD DD080 JJ02 JJ05 JJ07 KK43

Claims (6)

[Claims] 1. A digital camera provided with a display device using auxiliary light, a light source that emits the auxiliary light, a light source driving unit that supplies power to the light source to drive the light source, and a temperature detection unit that detects a temperature. Control means for controlling the light source driving means based on the detection result of the temperature detection means to adjust the brightness of the light source, wherein the temperature detection means is also used for other controls. And a digital camera. 2. The digital camera according to claim 1, wherein the display device is an LCD. 3. The digital camera according to claim 1, wherein the light source is an LED. 4. The digital device according to claim 1, wherein said temperature detecting means is disposed substantially near a distance measuring means for measuring a distance to a subject. camera. 5. The method according to claim 1, wherein the control unit corrects a temporal and a positional deviation of a detection result of the temperature detecting unit, and controls the light source driving unit to adjust the luminance of the light source based on the correction result. The digital camera according to claim 4, wherein: 6. The control device further comprising: a second light source that emits auxiliary light to the distance measuring unit; and a second light source driving unit that supplies electric power to the second light source to drive the second light source. The digital device according to claim 4, wherein the control unit controls the second light source driving unit based on a detection result of the temperature detection unit to adjust the luminance of the second light source. camera.