JP2014235206A - Imaging device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an imaging device capable of securing performance of a GPS and a wireless LAN, using an optimal heat radiation structure according to an operation mode, and capable of preventing temperature in the imaging device from increasing due to heat generation of a wireless LAN substrate and an LED strobe substrate.SOLUTION: Antenna parts of a GPS module and a wireless LAN module are disposed on positions above a camera and separated from a main substrate. Heat generated from the wireless LAN module and the LED strobe unit which generate much heat is brought into contact to the GPS module which generates less heat, for heat radiation.

Description

  The present invention relates to an imaging device including a GPS module, a wireless LAN module, and an LED strobe module that can acquire position information.

  In recent years, in imaging devices such as video cameras, digital cameras, and mobile phone terminals, an increasing number of imaging devices have a function of recording positional information obtained from signals from GPS satellites together with image data and a wireless communication function using radio waves. ing.

  In order to provide a GPS function and a wireless communication function, it is necessary to mount a GPS module and a wireless LAN module. However, in order to easily transmit and receive signals from GPS satellites and radio waves for wireless communication, the antenna of each module is used. Are often arranged on the upper surface or side surface of the imaging device main body. In addition, in the antenna arrangement of the GPS module and the wireless LAN module, a position where the photographer does not cover with the hand at the time of use is desirable.

  On the other hand, downsizing of an imaging apparatus has always been demanded. Therefore, there is a problem of an arrangement configuration that ensures the performance of the GPS module and the wireless LAN module without increasing the size of the imaging device itself. While arranging each module, miniaturization of parts itself is also performed. A common technique for miniaturization is to change the light emitting part of the strobe unit from a xenon tube to an LED.

  However, the brightness of the strobe light emitted from the LED as the light source of the strobe unit is weaker than that of the xenon tube, and it is necessary to apply more power to the LED in order to approach the same brightness. If a large amount of power is applied to the LED, the amount of heat generated by the LED increases, which is thermally disadvantageous. Therefore, the LED is more compact in size and wiring than the xenon tube, but since the amount of heat generated by the substrate is large, there is a possibility of adversely affecting elements and electric circuits on the LED strobe substrate.

  As a countermeasure, Patent Document 1 discloses a configuration in which a space is provided between the light emitting element and the lens covering the front opening of the reflector, and a plurality of heat radiation fins are formed on the inner side surface of the reflector.

JP 2012-93504 A

  However, in the prior art disclosed in Patent Document 1 described above, heat can be radiated from the light emitting element to the LED strobe substrate, but the LED strobe substrate itself becomes hot. Also, in the imaging device, the main wiring board is the first, and the wireless LAN board is also said to generate a large amount of heat at startup, so the internal temperature of the imaging device rises, which may adversely affect various elements and electrical circuits. Absent.

  However, unlike the main wiring board, the wireless LAN board and the LED strobe board are not always heated and heated during photographing. In many cases, the wireless communication function mainly selects an arbitrary photographed image in the reproduction mode and transmits / receives it to / from a PC or the like, while the LED strobe is often used in a dark place during photographing. Therefore, it is considered that the heat dissipation efficiency is good if there is a heat dissipation structure corresponding to the operation mode.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an image pickup that prevents an increase in internal temperature of an image pickup apparatus due to heat generation of a wireless LAN board or an LED strobe board by using an optimal heat dissipation structure corresponding to an operation mode while ensuring the performance of GPS and wireless LAN. Is to provide a device.

  In order to achieve the above object, the present invention generates a GPS module or a wireless LAN module antenna unit from the wireless LAN module and the LED strobe unit that generate a large amount of heat by disposing the antenna unit on the upper surface of the camera and at a position far from the main board. An imaging device characterized by a structure that dissipates heat by bringing the heat to be brought into contact with a GPS module that generates a small amount of heat.

  According to the present invention, an image pickup apparatus that prevents an increase in internal temperature of the image pickup apparatus due to heat generation of the wireless LAN board or the LED strobe board using an optimum heat dissipation structure according to the operation mode while ensuring the performance of the GPS and the wireless LAN. Can be provided.

(A) Appearance perspective view seen from the front, (b) Appearance perspective view seen from the back A perspective view showing the inside when the front cover is removed (A) Perspective view showing only parts related to the heat dissipation structure of the present invention (b) Exploded perspective view showing only parts related to the heat dissipation structure of the present invention Heat Dissipation Structure in Embodiment 2 of the Present Invention (a) Simplified view showing the switching mechanism in the camera body 1 (b-1) Schematic diagram showing the switching lever at the time of photographing and each board arrangement in the present invention (b-2) Photographing Sectional view showing switching lever at time and each substrate arrangement in the present invention (c-1) Switching lever at the time of reproduction and schematic diagram showing each board arrangement in the present invention (c-2) Switching lever at the time of reproduction and in the present invention Sectional view showing each board layout

[Example 1]
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  1A and 1B are external views according to an embodiment of the present invention. FIG. 1A is a perspective view seen from the front, and FIG. 1B is a perspective view seen from the back.

  In FIG. 1A, the camera body 1 is covered with a front cover 2 on the front surface, a back cover 3 on the back surface, and an upper cover 4 on the upper surface. At the center of the front surface of the camera body 1, there is a lens barrel 5 that holds a photographing lens composed of a plurality of lenses. The lens barrel 5 can change the zoom magnification and the focal length by moving the photographing lens in the optical axis direction. On the upper right side of the lens barrel 5, there is a light emission window 6 of a strobe composed of LEDs (light emitting diodes), which emit light as needed when the subject is dark.

  A power button 7 and a release button 8 are provided on the upper surface of the camera body 1.

  When the power button 6 is pressed, the digital camera comes out of the resting state, and the lens barrel 5 is extended a predetermined amount in the optical axis direction from the housed state shown in FIG. Further, when the camera is ready to shoot, pressing the release button 8 starts shooting.

  As shown in FIG. 1B, a liquid crystal display 9 is provided on the back of the camera body 1.

  The liquid crystal display 9 is used for confirming a subject image to be photographed and for reproducing and displaying the photographed image. An operation button group 10 is provided beside the liquid crystal display 9. The operation button group 10 also includes a cross key. The operation button group 10 is used for instructing functions such as changing shooting conditions, changing the display mode of the liquid crystal display, and switching to a playback screen. A terminal cover 11 that protects the external connection terminals is provided on the opposite side surface of the strobe of the camera body 1 to protect the external connection terminals from dust and the like.

  Examples of the external connection terminal include a connector for connection such as USB and HDMI (registered trademark). 12 can open and close a storage chamber for storing a main battery (not shown) including a rechargeable battery in addition to a single-use primary battery and a recording medium (not shown) on which a signal-processed subject image is recorded. It is a lid member. By opening the lid member 12, the opening of the storage chamber is opened, and each of the battery and the recording medium can be inserted and removed.

  Reference numeral 13 denotes a door member that opens to pull out a cord extending from the adapter to the outside of the camera body 1 when an adapter for supplying external power is accommodated instead of the battery.

  Next, the heat dissipation structure in the first embodiment of the present invention will be described with reference to FIGS. FIG. 2 is a perspective view showing the inside when the front cover 2 and the upper cover 4 are removed.

  FIG. 3A is a perspective view showing only parts related to the heat dissipation structure of the present invention, and FIG. 3B is an exploded perspective view thereof. For ease of explanation, the flexible printed circuit board is not shown in FIG. 2 and 3, reference numeral 14 denotes a main wiring board.

  A GPS module 15 records position information obtained from signals from GPS satellites together with image data. The GPS module 15 includes an antenna unit 151, a GPS substrate 152, and a GPS shield plate 153. The GPS module 15 is desirably arranged on the upper surface of the digital camera in order to improve the sensitivity of the antenna unit 151. In addition, it is better to arrange the lens barrel as far away from the main wiring board 14 as possible so that noise generated from the main wiring board 14 does not adversely affect elements (not shown) mounted on the GPS board 152. Is disposed at a position opposite to the main wiring board 14. In this embodiment, the GPS shield plate 153 is used to further protect the elements mounted on the GPS board 152.

  The GPS board 152 is fixed to the main chassis 18 with screws 15a and 15b together with the GPS shield plate 153. The heat generated by the GPS board 152 is transmitted through the GPS shield plate 153 and the main chassis 18 to radiate heat.

  Reference numeral 16 denotes a wireless LAN module which performs wireless communication using radio waves. The transmission / reception antenna unit 161 is arranged on the upper surface side of the wireless LAN substrate 162 so that communication radio waves can be easily transmitted and received, and all the elements other than the transmission / reception antenna unit 161 are mounted on the lower surface side of the wireless LAN substrate 162 (that is, the inside of the camera). Has been. Further, a heat conductive sheet 163 is attached to the upper surface side of the wireless LAN board 162.

  The wireless LAN module 16 is disposed on the substantially lower surface side of the GPS module 15. However, it is desirable that no other module or sheet metal be disposed near the upper surface of the antenna so as not to hinder communication in the transmission / reception antenna unit 161. Therefore, the GPS module is not arranged immediately above the transmission / reception antenna unit 161 of the wireless LAN module 16.

  The wireless LAN board 162 is fixed to the main chassis 18 with screws 16a and 16b. After the wireless LAN module 16 is attached, the GPS module 15 is attached. At this time, the heat conductive sheet 163 is preferably an elastic member for contacting the GPS shield plate 153. The heat generated by the wireless LAN board 162 is dispersed in the direction transmitted to the main chassis 18 via the screws 16a and 16b and the direction transmitted to the GPS shield plate 153 via the heat conductive sheet 163, which is advantageous for heat dissipation.

  Reference numeral 17 denotes an LED strobe unit, which is roughly composed of an LED (light emitting diode) 171 and an LED substrate 172. The LED board 172 is hooked on two hooks 153a provided on the GPS shield plate 153 and fixed with screws 15c. As a result, the back surface of the LED board 172 comes into contact with the GPS shield plate 153, and the heat generated by the LED board 172 is transmitted to the GPS shield plate 153 and radiated.

  In this way, the antenna part of the GPS module or wireless LAN module is arranged at a position far from the main wiring board on the upper surface of the camera, and the heat generated from the wireless LAN module and LED strobe unit that generate a large amount of heat is small. The contact with the GPS module can dissipate heat and prevent the temperature inside the camera from rising.

[Example 2]
This is a modification of the first embodiment. In many cases, the wireless communication function mainly selects an arbitrary photographed image in the reproduction mode and transmits / receives it to / from a PC or the like, while the LED strobe is often used in a dark place during photographing. That is, heat conduction to the GPS shield plate 153 may be performed only when the wireless LAN board 162 is reproduced and the LED board 172 is photographed.

With reference to FIG. 4, the heat dissipation structure in the 2nd Example of this invention is demonstrated. In FIG.
(A) In the camera main body 1, it is a simplified diagram which shows a switching mechanism.
(B-1) It is a schematic diagram which shows the switching lever at the time of imaging | photography, and each board | substrate arrangement | positioning in this invention.
(B-2) It is sectional drawing which shows the switching lever at the time of imaging | photography, and each board | substrate arrangement | positioning in this invention.
(C-1) It is a schematic diagram which shows the switching lever at the time of reproduction | regeneration, and each board | substrate arrangement | positioning in this invention.
(C-2) It is sectional drawing which shows the switching lever at the time of reproduction | regeneration, and each board | substrate arrangement | positioning in this invention.

  The wireless LAN board 162 is arranged so as not to cover the GPS module 15 in the height direction. A switching lever 19 that can be switched to a shooting mode or a playback mode is arranged on the upper surface of the camera body. The switching lever 19 that can be switched to a shooting mode and a playback mode with a switch (not shown) has a holding portion 19a. The holding part 19a is fitted with the fitting part 20a of the heat sink 20. Therefore, the heat sink 20 can be slid together with the switching lever 19.

  FIGS. 4B-1 and 4B-2 illustrate the shooting mode. In the shooting mode, the heat sink 20 slides between the GPS shield plate 153 and the LED sheet metal 173 that fixes the LED substrate 172, and contacts the GPS shield plate 153 and the LED sheet metal 173, respectively. For this reason, the heat generated in the LED substrate 172 is transferred to the GPS shield plate 153 via the heat sink 20.

  4 (c-1) and 4 (c-2) show the playback mode. In the reproduction mode, the heat sink 20 is in contact with the heat conductive sheet 163 attached on the wireless LAN board 16. At the same time, since it is also in contact with the GPS shield plate 153, the heat generated in the wireless LAN board 162 is transferred to the GPS shield plate 153 via the heat conductive sheet 163 and the heat radiating plate 20.

  In this way, by switching the heat transfer path according to the operation mode, it is possible to reliably move the heat to the GPS module side where the amount of heat generation is small, and to prevent the camera internal temperature from rising significantly. .

15 GPS module 153 GPS shield plate 16 Wireless LAN module 161 Antenna unit 162 Wireless LAN board 17 LED strobe unit 18 Main chassis 19 Switching lever 20 Heat sink

Claims (4)

A position receiving unit (15) for receiving information for calculating position information;
A transmission / reception unit (16) for transmitting and receiving radio waves for wireless communication;
A strobe board (17) on which the LED is mounted;
In an imaging apparatus having
The transmitting / receiving unit (16) is located on the inner side of the imaging device than the position receiving unit (15),
An image pickup apparatus comprising: a heat radiating plate (20) that enables the position receiving unit (15) to be thermally coupled to the transmitting / receiving unit (16) and the strobe board (17), respectively. According to the operation mode, a switching mechanism is provided that preferentially conducts heat to and from the position receiving unit (15) among the transmitting / receiving unit (16) and the strobe board (17) with a larger amount of heat generation. The imaging apparatus according to claim 1. The said position receiving part (15) is arrange | positioned in the upper surface side of a housing | casing (1), and is located in the position which pinches | interposes a lens drive part (5) between main boards (14). Or the imaging device of Claim 2. The imaging apparatus according to claim 1, wherein the transmitting / receiving antenna unit (161) is arranged at a position that does not overlap the position receiving unit (15) by projection.