JP5146669B2 - Lighting device - Google Patents

Description

  The present invention relates to a lighting device that lights a semiconductor light emitting element with an external power source such as a battery.

  Conventionally, for example, in camera photography outdoors, a portable illumination device that is lit by an external power source such as a battery is used to illuminate a subject.

  In such a portable lighting device, a housing having an opening for emitting light on the front surface and a handle protruding from the housing are generally provided, and an incandescent bulb or LED is provided in the housing. A light source such as a reflector or the like that reflects the light from the light source forward is disposed.

There is also a portable lighting device in which a lighting circuit for lighting a light source is arranged in the handle (see, for example, Patent Document 1).
Utility Model Registration No. 3114446 (4th page, FIG. 3)

  In such a portable lighting device, when an incandescent light bulb is used as a light source, if the voltage of the battery as an external power source decreases, the color temperature of the irradiating light decreases or the illuminance decreases. Since it can be seen during use that the voltage of the battery is decreasing, it is possible to stop use or replace the battery before the battery is destroyed due to overdischarge of the battery.

  However, when a semiconductor light-emitting element is used as the light source, the phenomenon that the amount of light emission also decreases due to the voltage drop of the external power supply as in the case of an incandescent bulb does not occur, so the battery as the external power supply is overdischarged and damaged There is a problem that is easy to do.

  Therefore, it is conceivable to add an overdischarge prevention function that automatically stops the lighting of the semiconductor light-emitting element by detecting a decrease in the voltage of the external power supply to the lighting circuit, but the lighting circuit becomes larger and thereby lighting The place for storing the lighting circuit of the device is also enlarged. In addition, overdischarge prevention components such as a semiconductor light emitting element that generates heat or lighting components of a lighting circuit may be thermally affected, and the overdischarge prevention function may fail or malfunction.

  The present invention has been made in view of the above points, and can be provided with an overdischarge prevention function of an external power supply without being increased in size. Further, the overdischarge prevention circuit is separated from the heat-emitting semiconductor light emitting element and the lighting circuit. It is an object of the present invention to provide an illumination device that can prevent over-discharge prevention circuit failures and malfunctions due to thermal effects.

The illumination device according to claim 1; a housing in which the semiconductor light emitting element is disposed; a reflector that is disposed in the housing and reflects the light of the semiconductor light emitting element in a shape expanded toward the light emitting direction; A handle provided protruding from the housing and provided with a connection portion with an external power source at the tip; a lighting circuit disposed on the bottom of the housing on the lower side of the reflector, and for turning on the semiconductor light emitting element by the external power An overdischarge prevention circuit which is disposed in the handle and detects a decrease in the voltage of the external power supply and stops the lighting circuit.

  The external power source is a battery such as a primary battery or a rechargeable secondary battery. It may be a fuel cell. Includes those whose power supply characteristics deteriorate due to overdischarge. The battery may be disposed outside or inside the lighting device. When the battery is disposed outside the lighting device, the battery is connected by a cable that supplies power to the lighting device.

  Examples of the semiconductor light emitting element include an LED and an organic EL, and a plurality of semiconductor light emitting elements may be arranged in a planar shape on a substrate to form a planar light source.

  In addition to the semiconductor light emitting element and the lighting circuit, for example, a reflector may be disposed in the housing.

  The handle only needs to have a size and shape that can be grasped by the hand.

  The lighting circuit supplies a predetermined lighting current to the semiconductor light emitting element by an external power source such as a battery.

  The overdischarge prevention circuit includes, for example, a function for detecting the voltage of the battery, a function for comparing the detected voltage with a preset reference voltage, a function for notifying when the battery voltage falls below the reference voltage, and a lighting circuit after the notification. It may include a function of stopping the lighting circuit by cutting off the power supply.

In addition, since the reflector has a shape that expands in the light emitting direction, a space is generated between the reflector and the housing, and a lighting circuit can be arranged using this space. .

Lighting apparatus of claim 2, wherein, in the illumination apparatus according to claim 1 Symbol placement, the handle, the operation switch and overdischarge preventing circuit is provided, this operation switch, power supply lines are wired from the connecting portion The output line of the operation switch is wired to the overdischarge prevention circuit.

  The operation switch may be one for turning on / off the semiconductor light emitting element and adjusting the brightness.

  For example, a cable is used for the wiring, but it may be a wiring board or a flexible board.

According to the lighting device of the first aspect, since the lighting circuit and the overdischarge prevention circuit are separated, the lighting circuit is arranged in the housing, and the overdischarge prevention circuit is arranged in the handle, the size of the lighting device is increased. Without over-discharge prevention function of external power supply, and furthermore, the over-discharge prevention circuit can be separated from the heat-emitting semiconductor light-emitting element and lighting circuit, so that the over-discharge prevention circuit can be damaged or malfunction due to thermal effects. Can be prevented. Furthermore , since the lighting circuit is arranged at the bottom of the housing under the reflector having a shape that expands in the light emitting direction, the lighting circuit can be hardly affected by the thermal effects of the semiconductor light emitting element. Can be prevented from malfunctioning or malfunctioning.

According to the illumination device according to claim 2, in addition to the effects of the lighting device according to claim 1 Symbol placement, the feed line is wired from the connection to the operation switch, the output line of the operation switch to the over-discharge protection circuit For wiring, the overdischarge prevention circuit is arranged in the handle, thereby facilitating wiring work.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a cross-sectional view of the lighting device, FIG. 2 is a partial cross-sectional view of the lighting device viewed from the plane, and FIG. 3 is a block diagram of the lighting device.

  As shown in FIG. 1, reference numeral 11 denotes a portable lighting device. The lighting device 11 includes a lighting device body 12 that can be carried by hand and a battery as an external power source that can be carried. B and a cable 13 which is a power supply line for connecting the lighting device main body 12 and the battery B are provided.

  The illuminating device main body 12 has a housing 16 formed in a substantially cylindrical shape having a front opening 15 on the front end surface, and a handle 17 that can be gripped with a hand protrudes from the rear lower portion of the housing 16 Has been.

  A planar light source unit 18 and a moving mechanism 19 are disposed on the rear side in the casing 16, and a reflector 20 and a translucent cover 21 are disposed on the front side in the casing 16. An attachment ring 22 for attaching the reflector 20 and the translucent cover 21 to the housing 16 is attached to the front end.

  Further, the planar light source unit 18 includes a planar light source 25, a heat dissipation device 26 disposed in contact with the back side of the planar light source 25, and a light control body 27 provided on the front side of the planar light source 25. And a diffusive filter F is disposed on the front side. The moving mechanism 19 can be moved integrally in the front-rear direction and in the optical axis direction perpendicular to the planar light source 25.

  The planar light source 25 is configured such that a plurality of semiconductor light emitting elements 29 such as LEDs are densely arranged on the front surface of a circular substrate 28 to form a planar light source, and a desired brightness is obtained.

  The heat radiating device 26 uses, for example, an aluminum heat sink 30 that contacts the back side of the substrate 28 of the planar light source 25 and radiates the heat of the planar light source 25 to the outside by natural convection.

  The light control body 27 is composed of a cylindrical reflection member 31 that opens in the front-rear direction, and is formed so that the rear end of the reflection member 31 is supported on the heat sink 30 side and the front end side of the reflection member 31 expands forward. Has been.

  As shown in FIGS. 1 and 2, the moving mechanism 19 includes rails 35 arranged on both sides of the planar light source unit 18 in parallel with the optical axis direction by support members 34 attached to the housing 16. A slide member 36 that moves in the optical axis direction along the rail 35 is provided, and the planar light source unit 18 is mounted on the slide member 36.

  On the lower side of the slide member 36, a semi-disc-shaped focus lever 38 is rotatably attached to the housing 16 with a screw 37, and the focus lever 38 protrudes from the rear surface of the housing 16 to the rear of the focus lever 38. An operating portion 39 is provided so as to be able to rotate. A pin 40 protrudes from the upper surface of one end of the focus lever 38, and an engagement hole 41 for engaging the pin 40 is formed in the slide member 36 as a long hole that is long in a direction perpendicular to the optical axis direction. Yes. Then, the slide member 36 and the planar light source unit 18 move in the optical axis direction through the engagement between the pin 40 and the engagement hole 41 by the rotation operation of the focus lever 38.

  The reflector 20 has a cylindrical shape that opens in the optical axis direction. The reflector 20 is provided with an emission opening 44 that emits light from the planar light source 25 on the front side, and the reflecting member 31 of the planar light source unit 18 on the back side. Is provided with a light source side opening 45 sized to be movable in the optical axis direction. A flange portion 46 is formed at the front end of the reflector 20 to be attached to the front end portion of the housing 16.

  Further, as shown in FIG. 1, the cover 21 is formed in a disk shape having diffusibility and translucency, and is disposed at the front end portion of the housing 16 with the flange portion 46 of the reflector 20 interposed therebetween. A mounting ring 22 attached to the body 16 is sandwiched and fixed together with the reflector 20 between the front end of the housing 16.

  The mounting ring 22 is formed with a circular window 49 through which light that has passed through the cover 21 is emitted.

  On the back side of the handle 17, an operation switch 52 (hereinafter simply referred to as a switch 52) for turning on and off the semiconductor light emitting element 29 of the planar light source 25, and lighting or blinking that the voltage of the battery B has decreased. A voltage drop warning lamp 53 to be displayed is arranged.

  Further, an overdischarge prevention circuit 56 that detects the voltage of the battery B and prevents the occurrence of overdischarge is disposed inside the handle 17, and the bottom of the casing 16 below the reflector 20 inside the casing 16. Is provided with a lighting circuit 57 for lighting the semiconductor light emitting element 29 of the planar light source 25 with the power supplied from the battery B via the overdischarge prevention circuit 56.

  A connecting portion 58 into which the cable 13 connected to the battery B is introduced is provided at the lower portion of the handle 17, and the cable 13 is connected from the connecting portion 58 to the switch 52, and the output line of the switch 52 is prevented from overdischarge. Wired to the circuit 56, wired from the overdischarge prevention circuit 56 to the lighting circuit 57 in the housing 16, and wired from the lighting circuit 57 to the semiconductor light emitting element 29 of the planar light source 25 in the housing 16.

  Next, as shown in FIG. 3, the overdischarge prevention circuit 56 includes an overdischarge prevention substrate 61 provided with the overdischarge prevention circuit 56, and the overdischarge prevention circuit 56 is provided on both surfaces of the overdischarge prevention substrate 61. Each component such as an IC, a capacitor, and a relay is mounted. The overdischarge prevention board 61 is connected to a power supply line between the switch 52 and the lighting circuit 57 and detects that the polarity of the battery B is reversely connected. A substrate power supply unit 63 connected to a power supply line through 62 to supply power to the overdischarge prevention substrate 61, a reference voltage unit 64 for holding a reference voltage for judging a voltage drop of the battery B, and a reverse connection prevention circuit unit 62 A power supply voltage detecting unit 65 connected to the power supply line via the power supply line to detect the voltage of the battery B, a control unit 66 for comparing and controlling the reference voltage and the voltage of the battery B, and a relay switch 67 for opening and closing the power supply line ing. Then, the control unit 66 compares the reference voltage with the voltage of the battery B, and if it is determined that the voltage of the battery B has dropped below the reference voltage, first, the voltage drop warning lamp 53 is lit or blinked to notify, After a predetermined time, the relay switch 67 is turned off to open the power line.

  The lighting circuit 57 includes a lighting circuit board 71 provided with the lighting circuit 57, and each component constituting the lighting circuit 57 is mounted on the lighting circuit board 71.

  Next, the operation of the illumination device 11 will be described.

  When the switch 52 is off, the relay switch 67 is off.

  By turning on the switch 52, the power from the battery B is supplied to the power line of the overdischarge prevention circuit 56.

  If the reverse connection prevention circuit unit 62 detects that the polarity of the battery B is reverse connection, the relay switch 67 is kept off and prevents the semiconductor light emitting element 29 from being damaged by the reverse connection of the battery B. .

  When the reverse connection prevention circuit unit 62 detects that the polarity of the battery B is not reverse connection, the power supply voltage detection unit 65 detects the voltage of the battery B, and the control unit 66 determines the voltage of the battery B and the reference voltage. Compare.

  As a result of comparison in the control unit 66, when it is determined that the voltage of the battery B is higher than the reference voltage, the relay switch 67 is turned on, the power of the battery B is supplied to the lighting circuit 57, and the lighting circuit 57 emits semiconductor light. The element 29 is turned on.

  Further, by turning off the switch 52, the power supply to the lighting circuit 57 is cut off, and the semiconductor light emitting element 29 is turned off.

  If the control unit 66 determines that the voltage of the battery B has dropped below the reference voltage while the semiconductor light emitting element 29 with the switch 52 turned on is turned on, the voltage drop warning lamp 53 is first turned on or blinked to notify the user. To do. At this time, a function of simultaneously generating sound or vibrating may be provided. By this notification, it is possible to notify the user in advance that the semiconductor display element 29 is forcibly turned off due to the voltage drop of the battery B.

  When a predetermined time elapses without the switch 52 being turned off, the relay switch 67 is turned off, the power supply to the lighting circuit 57 is cut off, and the semiconductor display element 29 is forcibly turned off. Thereby, it is possible to reliably prevent the battery B from being overdischarged.

  As described above, in the lighting device 11, the lighting circuit 57 and the overdischarge prevention circuit 56 are separated, the lighting circuit 57 is disposed in the housing 16, and the overdischarge prevention circuit 56 is disposed in the handle 17. 11 can be provided with an overdischarge prevention function of the battery B without increasing the size, and further, the overdischarge prevention circuit 56 can be separated from the semiconductor light emitting element 29 and the lighting circuit 57 that generate heat, and overdischarge due to thermal influence The prevention circuit 56 can be prevented from malfunctioning or malfunctioning.

  In addition, since the lighting circuit 57 is disposed at the bottom of the casing 16 below the reflector 20 having a shape expanded toward the light emission direction, the lighting circuit 57 is thermally connected to the semiconductor light emitting element 29. It is difficult to be affected, and the failure of the lighting circuit 57 and the occurrence of malfunction can be prevented.

  Further, a power supply line from the battery B is wired to the switch 52 from the connection portion 58, and the output line of the switch 52 is wired to the overdischarge prevention circuit 56 in the handle 17, so that the overdischarge prevention circuit 56 is connected from the battery B. Wiring work can be facilitated by arranging the handle 17 on the wiring side.

It is sectional drawing of the illuminating device which shows one embodiment of this invention. It is a fragmentary sectional view seen from the plane direction of an illuminating device same as the above. It is a block diagram of an illuminating device same as the above.

11 Lighting equipment
16 housing
17 Toride
20 Reflector
29 Semiconductor light emitting devices
52 Operation switch
56 Overdischarge prevention circuit
57 Lighting circuit
58 Connection B Battery as an external power source

Claims (2)

A housing in which a semiconductor light emitting element is disposed;
A reflector that is disposed in the housing and reflects the light of the semiconductor light emitting element in a shape that expands in the light emitting direction;
A handle provided protruding from the housing and provided with a connection portion with an external power source at the tip;
A lighting circuit disposed at the bottom of the lower housing of the reflector and lighting the semiconductor light emitting element by the external power source;
An overdischarge prevention circuit which is disposed in the handle and detects a drop in the voltage of the external power supply to stop the lighting circuit;
Lighting apparatus characterized in that it comprises a. The handle is provided with an operation switch and an overdischarge prevention circuit.
This operation switch, the feed line is wired from the connection unit, according to claim 1 Symbol mounting lighting device, characterized in that the output line of the operation switch is wired to the overdischarge prevention circuit.

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