JP2006308775A - Light source device and camera - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent heat generated from a light source from being accumulated in a reflector. <P>SOLUTION: Fins 70 are integrally formed on the backside of the reflector 68. Accordingly, the heat of an LED-mounted substrate 64 is dissipated from the backside of the reflector 86 by the fins 70. Then, this prevents erroneous operations of electronic components disposed near the LED-mounted substrate 64. In addition, since the fins 70 are integrally formed with the reflector 68, the need to increase mounting cost is obviated. Further, the reflector 68 is attached to a housing 12, in which a hole 78 is made for introducing outside air to the backside of the reflector 68. Thus, heat dissipated by the fins 70 formed on the reflector 68 is emitted outside of the housing 12 from the hole 78. This prevents heat from being accumulated in the housing 12. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a light source device and a camera equipped with the light source device.

  For example, a light emitting diode (LED) is used in an AF light emitting device that is mounted on a digital camera or the like and emits AF (Automatic Focus) auxiliary light for measuring a distance from a photographing lens to a subject. (See Patent Document 1).

In patent document 1, LED is attached to the reflector through the insulator. At this time, the reflector is heated by the light emission of the LED. Moreover, when the projection port of a reflector is obstruct | occluded with glass etc., heat will remain in a reflector. As a result, there is a risk that an electronic component arranged in the vicinity of the reflector may malfunction.
JP 2003-59306 A

  In view of the above fact, an object of the present invention is to prevent the heat generated from the light source from being stored in the reflector.

  In the light source device according to claim 1, a light source device including a light source and a reflection member provided with a reflection surface so as to surround the light source and reflecting light emitted from the light source is provided on a back surface of the reflection surface. The first heat dissipating means is formed integrally with the reflecting member.

  According to the first aspect of the present invention, the reflecting member is provided with the first heat radiation means integrally on the back surface. Thereby, the air of the reflective member heated by the light source is radiated outside the back surface of the reflective surface by the first heat radiating means. Therefore, there is no possibility of causing malfunction of an electronic component near the reflecting member.

  Moreover, since the 1st heat radiating means is provided integrally with the reflecting member, there is no fear that the attachment cost will increase.

  The invention according to claim 2 is characterized in that an opening for introducing outside air to the first heat radiating means is formed in the housing to which the reflecting member is attached.

  According to the second aspect of the present invention, the reflecting member is attached to the casing, and the casing is formed with an opening hole for introducing outside air into the first heat radiating member. Thereby, since the heat dissipated by the first heat dissipating means provided in the reflecting member is released from the opening hole to the outside air, the heat does not remain in the housing. Therefore, the heat dissipation effect is improved.

  The invention according to claim 3 is characterized in that the first heat radiating means is a plurality of heat radiating plates formed on the reflecting member.

  According to the third aspect of the present invention, the plurality of heat sinks are formed on the back surface of the reflecting surface of the reflecting member. Since the surface area of the back surface of the reflecting member can be easily increased by this heat radiating plate, the heat radiation amount of the reflecting member can be easily adjusted.

  According to a fourth aspect of the present invention, there is provided a light source device comprising: a light source; and a reflection member provided with a reflection surface so as to surround the light source, and reflecting light emitted from the light source. Is characterized by being covered with a second heat radiating means capable of transmitting light.

  According to the fourth aspect of the present invention, in the second heat radiating means capable of transmitting light to the projection port of the reflecting member, the heat of the reflecting member heated by the light source is dissipated and the reflecting member does not accumulate heat. .

  The invention according to claim 5 is characterized in that the second heat radiating means is composed of a plurality of plate members arranged at a predetermined interval.

  According to the invention described in claim 5, a plurality of gaps are formed at the projection port of the reflecting member by arranging the plurality of plate members at a predetermined interval. Thereby, the air of the reflecting member heated by the light source is easily radiated to the outside of the light source device, and heat is not trapped in the reflecting member.

  In a sixth aspect of the present invention, the second heat dissipating means is composed of a shield member that closes the projection opening and transmits light, and a plurality of grooves formed on the outer surface of the shield member. It is characterized by.

  According to the sixth aspect of the present invention, the projection port of the reflecting member is closed by the shield member capable of transmitting light having a plurality of grooves formed on the outer surface. The surface area of the outer surface of the reflecting member is expanded by the groove, and the heat of the reflecting member heated by the light source is radiated to the outer surface.

  The invention according to claim 7 is characterized in that a plurality of the light sources are arranged on the reflecting member.

  According to the seventh aspect of the present invention, when a plurality of light sources are arranged on the reflecting member, the heat generated from the light source is removed from the reflecting member by the first heat dissipating means or the second heat dissipating means provided on the reflecting member. Is released.

  The invention according to claim 8 is characterized in that a plurality of the reflecting members are arranged, and the light sources are arranged on the reflecting members, respectively.

  According to the eighth aspect of the present invention, when each of the plurality of reflecting members is provided with a light source, heat generated from each light source is provided with the first heat radiating means provided on each reflecting member. Alternatively, it is discharged out of the reflecting member by the second heat radiating means.

  The invention according to claim 9 is characterized in that the light source is an LED.

  According to the ninth aspect of the present invention, if an LED (light emitting diode) is used as the light source, the power consumption can be reduced, and since the amount of heat generation is small, the possibility of the influence of heat generation on the periphery is reduced.

  The invention according to claim 10 is characterized in that the light source is composed of a substrate attached to the first heat radiation means and an LED mounted on the substrate and surrounded by a reflective surface. .

  According to invention of Claim 10, the 1st thermal radiation means is attached to the board | substrate with which LED surrounded by the reflective surface was mounted. Thereby, since the heat | fever of the board | substrate which is easy to generate | occur | produces is thermally radiated from a 1st thermal radiation means, a heat | fever does not remain in a reflecting member.

  A camera according to an eleventh aspect includes the light source device according to any one of the first to tenth aspects.

  Since the present invention has the above configuration, the heat generated from the light source does not stay in the reflector.

  The light source device (strobe 44) according to the first embodiment of the present invention will be described below with reference to the drawings. First, an external configuration of the digital camera 10 on which the strobe 44 is mounted will be described with reference to FIG.

  In front of the digital camera 10, a lens 21 for forming a subject image, a strobe 44 that emits light to irradiate the subject when necessary, and a viewfinder used to determine the composition of the subject to be photographed. 20 is provided. The configuration of the strobe 44 will be described later in detail.

  Further, on the upper surface of the digital camera 10, a release button (so-called shutter) 56A that is pressed when performing shooting and a power switch 56B are provided.

  Note that the release button 56A of the digital camera 10 according to the present embodiment is pressed down to an intermediate position (hereinafter referred to as “half-pressed state”) and to a final pressed position beyond the intermediate position. A two-stage pressing operation of a state (hereinafter referred to as a “fully pressed state”) can be detected.

  In the digital camera 10, the release button 56A is pressed halfway to activate the AE (Automatic Exposure) function to set the exposure state (shutter speed, aperture state), and then AF (Auto Focus). , Automatic focusing) function is performed to control focusing, and then exposure (photographing) is performed when the button is fully pressed.

  On the other hand, on the back of the digital camera 10, an eyepiece of the above-described finder 20, a liquid crystal display (hereinafter referred to as “LCD”) 38 for displaying a photographed subject image, a menu screen, and the like are photographed. There is provided a mode changeover switch 56C that is slid and operated when setting a shooting mode that is a mode to be performed and a reproduction mode that is a mode for reproducing a subject image on the LCD 38.

  Further, on the back surface of the digital camera 10, a cross cursor button 56D and a forced light emission switch 56E that is pressed when setting the forced light emission mode, which is a mode for forcibly causing the flash 44 to emit light during photographing, are further provided. It has been.

  The cross-cursor button 56D has a total of five arrow keys indicating four upward, downward, left, and right directions of movement in the display area of the LCD 38 and a determination key positioned at the center of the four arrow keys. Consists of two keys.

  Next, the configuration of the electrical system of the digital camera 10 according to the present embodiment will be described with reference to FIG.

  The digital camera 10 includes an optical unit 22 including the lens 21 described above, a charge coupled device (hereinafter referred to as “CCD”) 24 disposed behind the optical axis of the lens 21, and an input analog. And an analog signal processing unit 26 that performs various analog signal processing on the signal.

  The digital camera 10 also performs an analog / digital converter (hereinafter referred to as “ADC”) 28 that converts an input analog signal into digital data, and performs various digital signal processing on the input digital data. And a digital signal processing unit 30.

  The digital signal processing unit 30 has a built-in line buffer having a predetermined capacity, and also performs control to directly store the input digital data in a predetermined area of the memory 48 described later.

  The output terminal of the CCD 24 is connected to the input terminal of the analog signal processing unit 26, the output terminal of the analog signal processing unit 26 is connected to the input terminal of the ADC 28, and the output terminal of the ADC 28 is connected to the input terminal of the digital signal processing unit 30. . Accordingly, the analog signal indicating the subject image output from the CCD 24 is subjected to predetermined analog signal processing by the analog signal processing unit 26, converted into digital image data by the ADC 28, and then input to the digital signal processing unit 30.

  On the other hand, the digital camera 10 generates a signal for displaying a subject image, a menu screen or the like on the LCD 38 and supplies the signal to the LCD 38, and a CPU (Central Processing Unit) 40 that controls the operation of the entire digital camera 10. A memory 48 for storing digital image data obtained by photographing, and a memory interface 46 for controlling access to the memory 48 are included.

  Further, the digital camera 10 includes an external memory interface 50 for enabling the portable memory card 52 to be accessed by the digital camera 10, and a compression / decompression processing circuit 54 for performing compression processing and decompression processing on the digital image data. It is configured to include.

  In the digital camera 10 of the present embodiment, a VRAM (Video RAM) is used as the memory 48 and a smart media (Smart Media (registered trademark)) is used as the memory card 52.

  The digital signal processing unit 30, the LCD interface 36, the CPU 40, the memory interface 46, the external memory interface 50, and the compression / decompression processing circuit 54 are connected to each other via a system bus BUS. Therefore, the CPU 40 controls the operation of the digital signal processing unit 30 and the compression / decompression processing circuit 54, displays various information via the LCD interface 36 to the LCD 38, the memory interface 46 to the memory 48 and the memory card 52, and the external memory interface. 50 can be accessed each.

  On the other hand, the digital camera 10 includes a timing generator 32 that mainly generates a timing signal for driving the CCD 24 and supplies the timing signal to the CCD 24, and the driving of the CCD 24 is controlled by the CPU 40 via the timing generator 32.

  Further, the digital camera 10 is provided with a motor drive unit 34, and driving of a focus adjustment motor, a zoom motor, and an aperture drive motor (not shown) provided in the optical unit 22 is also controlled by the CPU 40 via the motor drive unit 34. The

  In other words, the lens 21 according to the present embodiment has a plurality of lenses, is configured as a zoom lens that can change (magnify) the focal length, and includes a lens driving mechanism (not shown). The lens drive mechanism includes the focus adjustment motor, the zoom motor, and the aperture drive motor, and these motors are each driven by a drive signal supplied from the motor drive unit 34 under the control of the CPU 40.

  Further, the release button 56A, the power switch 56B, the mode changeover switch 56C, the cross cursor button 56D, and the forced light emission switch 56E (generally referred to as “operation unit 56” in the figure) are connected to the CPU 40, and the CPU 40. Can always grasp the operation state of the operation unit 56.

  In addition, the digital camera 10 includes a charging unit 42 that is interposed between the strobe 44 and the CPU 40 and charges power for causing the strobe 44 to emit light under the control of the CPU 40. Further, the strobe 44 is also connected to the CPU 40, and the light emission of the strobe 44 is controlled by the CPU 40.

  Next, an overall operation at the time of shooting of the digital camera 10 according to the present embodiment will be briefly described.

  First, the CCD 24 performs imaging through the optical unit 22 and sequentially outputs analog signals for R (red), G (green), and B (blue) indicating the subject image to the analog signal processing unit 26. The analog signal processing unit 26 performs analog signal processing such as correlated double sampling processing on the analog signal input from the CCD 24 and sequentially outputs the analog signal to the ADC 28.

  The ADC 28 converts the R, G, and B analog signals input from the analog signal processing unit 26 into 12-bit R, G, and B signals (digital image data) and sequentially outputs them to the digital signal processing unit 30. To do. The digital signal processing unit 30 accumulates digital image data sequentially input from the ADC 28 in a built-in line buffer and temporarily stores the digital image data directly in a predetermined area of the memory 48.

  The digital image data stored in a predetermined area of the memory 48 is read out by the digital signal processing unit 30 under the control of the CPU 40, and white balance adjustment is performed by applying a digital gain according to a predetermined physical quantity. Processing and sharpness processing are performed to generate 8-bit digital image data.

  The digital signal processing unit 30 performs YC signal processing on the generated 8-bit digital image data to generate a luminance signal Y and chroma signals Cr and Cb (hereinafter referred to as “YC signal”), and the YC signal. Are stored in an area different from the predetermined area of the memory 48.

  The LCD 38 is configured to display a moving image (through image) obtained by continuous imaging by the CCD 24 and can be used as a finder. When the LCD 38 is used as a finder, the LCD 38 is generated. The YC signals thus output are sequentially output to the LCD 38 via the LCD interface 36. As a result, a through image is displayed on the LCD 38.

  Here, when the release button 56A is half-pressed by the user, after the AE function is activated and the exposure state is set as described above, the AF function is activated and focus control is performed, and then the fully-pressed state is continued. In this case, the YC signal stored in the memory 48 at this time is compressed in a predetermined compression format (in this embodiment, JPEG format) by the compression / decompression processing circuit 54 and then passed through the external memory interface 50. To the memory card 52.

  Next, the strobe 44 will be described.

  As shown in FIG. 3, the strobe 44 includes a light emitting diode (LED) 62. The LED 62 is mounted on the LED mounting board 64.

  The LED mounting board 64 is attached to the reflector 68. The reflector 68 has a truncated cone shape having a wide opening 68A, and a circular opening 74 is formed on the bottom surface facing the wide opening 68A. The LED 74 mounted on the LED mounting board 64 is inserted into the opening 74, and the LED mounting board 64 is attached to the back surface of the reflector 68 (the back surface of the reflection surface).

  As shown in FIG. 4, a plurality of fins 70 are integrally formed on the back surface of the reflector 68 at regular intervals. Thus, since the surface area of the back surface of the reflector 68 is increased by forming the plurality of fins 70, the heat generated in the LED mounting substrate 64 by causing the LED 62 to emit light is easily radiated from the back surface of the reflector 68.

  As shown in FIG. 5, the housing 12 of the digital camera 10 (see FIG. 1) is positioned on the wide opening 68 </ b> A side of the reflector 68. The casing 12 is formed with a circular opening 72 having the same size as the wide opening 68 </ b> A of the reflector 68, and a cover glass 76 is fitted into the opening 72. Thereby, the light emitted from the LED 62 is reflected by the reflector 68, passes through the cover glass 76, and is irradiated to the subject.

  Six holes 78 are formed in the vicinity of the opening 72 of the housing 12. Then, as shown in FIG. 6, heat radiated from the back surface of the reflector 68 and trapped in the space closed by the reflector 68 and the housing 12 is released from the hole 78 to the outside of the housing 12. Yes.

  In the present embodiment, the six holes 78 are provided in the vicinity of the opening 72, but the number of the holes 78 is not limited to six. Further, a hole 78 is formed near the opening 72 of the housing 12 (near the cover glass 76 is fitted), and the heat accumulated in the space closed by the reflector 68 and the housing 12 is formed on the emission direction side of the LED 62. Although it is configured to dissipate heat, a hole may be formed in the wall surface orthogonal to the emission direction of the LED 62. That is, the direction in which the heat radiated from the reflector 68 is released does not necessarily match the emission direction of the LED 62.

  Next, the operation of the first embodiment of the present invention will be described.

  In the strobe 44 on which the LED 62 is mounted, since the LED 62 has a long time to emit light, the LED mounting board 64 on which the LED 62 is mounted has heat. Therefore, a plurality of fins 70 are formed on the back surface of the reflector 68 at regular intervals. Thereby, the heat of the LED mounting substrate 64 is radiated from the back surface of the reflector 86 by the fins 70. Therefore, there is no possibility that an electronic component near the LED mounting board 64 will malfunction. Further, since the fin 70 is provided integrally with the reflector 68, there is no fear that the mounting cost will increase.

  Further, the reflector 68 is attached to the housing 12, and the housing 12 is formed with a hole 78 for introducing outside air to the back surface of the reflector 68. Thereby, the heat radiated from the fins 70 provided in the reflector 68 is released from the hole 78 to the outside of the housing 12, so that the heat is not stored in the housing 12.

  Next, a light source device (strobe 80) according to a second embodiment of the present invention will be described. In addition, the description about the part similar to 1st Embodiment is omitted.

  Instead of the cover glass 76 of the first embodiment, in the second embodiment, a plurality of plate-like members 82 are attached to the opening 72 of the housing 12 with a predetermined interval. That is, the opening 72 is in a state in which a plurality of gaps are formed, and the heat in the reflector 68 heated by causing the LED 62 to emit light is released from the gap to the outside of the reflector 68 (see FIG. 3). It has become so. Thereby, heat is not trapped in the reflector 68.

  In the present embodiment, the plurality of plate-like members 82 are provided in the opening 72 at a predetermined interval. However, the opening 72 is covered with a light-transmitting shield member, and the shield member faces the LED 62. You may form a some groove | channel in the surface (outer surface) on the opposite side to a side. Thereby, since the surface area of the outer surface of the shield member is increased, the heat heated by the light emission of the LED 62 can be efficiently radiated to the outside of the housing 12.

  In the present embodiment, a strobe is taken as an example of the light source device, and a case where only one LED is mounted on the LED mounting board 64 has been described. However, a plurality of LEDs are mounted on the LED mounting board. In the case of the light source device, by providing each LED with a reflector having fins formed on the back surface, the heat generated on the LED mounting substrate due to the light emission of the LED can be efficiently dissipated through each reflector. can do.

  Further, in the present embodiment, the strobe that uses the LED is described as the light source device, but an incandescent bulb or a laser diode (LD) is used as a light source, and a reflecting mirror (reflector) is provided so as to cover the light source. The present invention can be applied to any light source device.

It is an external view which shows the external appearance of the camera by which the light source device which concerns on the 1st Embodiment of this invention is mounted. It is a block diagram which shows the structure of the electric system of the camera by which the light source device which concerns on the 1st Embodiment of this invention is mounted. It is a disassembled perspective view which shows the light source device which concerns on the 1st Embodiment of this invention. It is the perspective view which looked at the light source device which concerns on the 1st Embodiment of this invention from the back side. It is a perspective view which shows the state which attaches the light source device which concerns on the 1st Embodiment of this invention to the housing | casing of a camera. It is sectional drawing of the state which attached the light source device which concerns on the 1st Embodiment of this invention to the housing | casing of the camera. It is a perspective view which shows the light source device which concerns on the 2nd Embodiment of this invention.

Explanation of symbols

10 Digital camera (camera)
12 Housing 44 Flash (light source device)
62 LED
64 LED mounting board (board)
68 Reflector (reflective member)
68A Wide mouth opening (opening)
70 fins (first heat dissipation means)
76 Cover glass (shield member)
78 holes (open holes)
80 light source device 82 plate-like member (second heat radiation means)

Claims (11)

In a light source device having a light source and a reflection member provided with a reflection surface so as to surround the light source and reflecting light emitted from the light source,
A light source device comprising a first heat radiating unit formed integrally with the reflecting member on a back surface of the reflecting surface.   The light source device according to claim 1, wherein an opening hole for introducing outside air to the first heat radiating unit is formed in a housing to which the reflection member is attached.   The light source device according to claim 1, wherein the first heat radiating unit is a plurality of heat radiating plates formed on the reflecting member. In a light source device having a light source and a reflection member provided with a reflection surface so as to surround the light source and reflecting light emitted from the light source,
The light source device, wherein the projection port of the reflecting member is covered with a second heat radiating means capable of transmitting light.   5. The light source device according to claim 4, wherein the second heat dissipating unit includes a plurality of plate members arranged at predetermined intervals.   The said 2nd thermal radiation means is comprised by the shield member which can close the said projection opening, and can permeate | transmit light, and the several groove | channel formed in the outer surface of the said shield member, The Claim 4 characterized by the above-mentioned. Light source device.   The light source device according to claim 1, wherein a plurality of the light sources are arranged on the reflection member.   The light source device according to claim 1, wherein a plurality of the reflecting members are arranged, and the light sources are arranged on the reflecting members, respectively.   The light source device according to claim 1, wherein the light source is an LED.   The said light source is comprised by the board | substrate attached to the said 1st thermal radiation means, and LED mounted in the said board | substrate, and is enclosed by the reflective surface, The one of Claims 1-8 characterized by the above-mentioned. The light source device according to Item 1.   A camera comprising the light source device according to any one of claims 1 to 10.

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