JPS59159142A - Strobe device - Google Patents

Abstract

PURPOSE:To simplify the constitution of the titled device, to reduce the size and to cool efficiently a voltage boosting circuit by arranging a circuit board so as to be contained vertically in a box provided with air inflow holes which is fitted to the upper part side of a grip pivotally and freely turnably supporting a light emitting part main body. CONSTITUTION:The armored box 17 is fitted to the upper part of the grip 15 pivotally and freely turnably supporting the light emitting part body 11 through a shaft 12. The air inflow holes 17a, 17b are formed on the upper and lower walls of the box 17 and the circuit substrates 19a, 19b including power source voltage boosting circuits 18 are fitted so as to be vertically contained in the box 17. Consequently, the constitution of the strobe device is simplified and reduced and the built-in voltage boosting circuit can be efficiently cooled.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a strobe device, and more particularly to a so-called bounce-type strobe device in which a light emitting section body is rotatable with respect to a grip section.

Generally, in a strobe device equipped with a grip,
A power battery was housed inside the grip, and the power from the battery was used to photoelectrically power the main capacitor. However, a strobe device/mine equipped with a grip part,
Since the guide nano-yo is a large strobe device and is equipped with a large-capacity main capacitor, it takes a long time to generate the photoelectric power using only the power from the power battery stored in the grip, and the quick shooting performance of strobe photography is affected. There was a problem with the lack of . In order to alleviate these problems to some extent, conventionally, a separate power source such as a stacked pack or a power pack is prepared, and the power from this separate power source is used to supplement the photoelectric power of the main capacitor, thereby reducing the charging time. I was trying to shorten the time.

However, separate power supplies such as laminated packs and power packs require the user to carry them around on their shoulders, which has the drawback of poor portability and cumbersomeness.

In order to overcome the above-mentioned drawbacks of the prior art, it is possible to accommodate more power batteries in the grip of the strobe device and at the same time increase the output of the power booster circuit. However, when attempting to increase the output of the power booster circuit, the power booster circuit becomes larger and heavier, and in conventional strobe devices, the power booster circuit is usually located inside the light emitting unit. However, there was a problem in that the main body of the light emitting unit had to be large and heavy. 9q. In bounce-type strobe devices where the light emitting unit can be rotated relative to the gristle part, the light emitting unit is large because the light emitting unit can be rotated to the bounce position or locked at the bounce position. In addition, the bounce mechanism, nine-rotation mechanism, lock mechanism, etc. must be made larger and more robust to compensate for the increased size, and there is a risk that the strobe device will become even larger and heavier.

Therefore, this goes against the original purpose of reducing the burden on the user by eliminating the need to carry a separate power source such as a laminated bag or power bag.

Therefore, in order to increase the output of the power booster circuit and at the same time prevent the light emitting unit from becoming too large and bulky, the power booster circuit should not be placed inside the light emitting unit itself. It is only necessary to arrange the grating part so that it is fixed in place. In this way, the light emitting unit itself can be made smaller and lighter, the bounce mechanism, locking mechanism, etc. of the light emitting unit can be made smaller and lighter, and the grip can be made larger due to the role of the power boost circuit. This offsets the burden on the user as a whole.

However, even if the power booster circuit is placed next to the grip, the circuit board 2 with the power booster circuit 1 mounted thereon must be placed horizontally inside the outer box 3, as shown in FIG. If the power supply booster circuit 1 is operated, the heat dissipation effect of the heat generated during operation of the power supply booster circuit 1 will deteriorate.
There was a time when the degree of heat accumulation increased.In particular, if you increase the output of the power supply booster circuit l and shorten the charging time, it is natural that the light emission interval may become shorter, and in this case However, as shown in FIG. If the accumulation of heat in 1 becomes too large, it may lead to destruction of components such as transistors due to heat or metamorphosis due to adhesion of evaporated flux, which may make the power supply booster circuit 1 inoperable. In order to increase the effectiveness, it becomes necessary to provide ventilation inside the box body 3, but if the side walls of the box body 3 are made with through holes, foreign matter will not be able to enter from the outside ((therefore, the power supply voltage will increase). The circuit 1 is prone to failure, and if metal wires, etc. are completely inserted from the outside, there will be a problem that it is dangerous.In addition, air circulation holes 3a are provided in the upper and lower walls of the box 3, and the circuit board 2 It is possible to increase the heat dissipation effect by drilling through holes in the board itself, but the back side of the board 2 is covered with a circuit pattern, and there are restrictions on the size of the through holes and the number of seven positions. It is not possible to obtain a sufficient cooling effect.If you try to obtain a cooling effect equivalent to the amount of light, you will have to reduce the effective area of the substrate 2.
This greatly impairs the freedom of wiring on the board 2.

In view of the above-mentioned points, an object of the present invention is to vertically mount a circuit board on which a power booster circuit is attached in a box body provided at the upper part of a grip part and having air circulation holes in the upper and lower walls. To provide a strobe device arranged so as to be oriented in the same direction.

Hereinafter, the present invention will be explained based on illustrated embodiments.

FIG. 3 shows a strobe device showing one embodiment of the present invention. This strobe device has light emitting windows 11a and 1 on the front.
1b, a light emitting unit main body 11'f, a base part 13 arranged to be slightly rotatable about a horizontal support shaft 12, and this base part 13. A power supply booster circuit housing part 14 that supports the rotating part so as to be slightly rotatable about a vertical axis (not shown) below, and a grip part 15 that fixes this power supply booster circuit housing part 14 to the upper end part.
The main body consists of

The light-emitting windows 11a and 11b are formed of rectangular transparent windows connected below, and inside thereof are parabolically curved original reflection plates 16a and 16b, and flash discharge tubes. F
L, , PL, are arranged respectively.

The main capacitors CM, , CM, (see Fig. 6) that supply m currents of discharge to the flash discharge tubes PL, , PL, are:
It is disposed within the light emitting section main body 11. Further, bearing members 13a and 13b for supporting the support shaft 12 are fixed to both sides of the base portion 13E, and as shown in FIG. A through hole 13c communicating with is bored.

As shown in FIG. 4, the power supply booster circuit housing section 14 includes
An exterior box 17 having a square plate-like appearance, and a circuit board vertically disposed within the exterior box 17 so that the surfaces on which the power supply booster circuit 18 is mounted face each other and are widely spaced apart. 19a and 19b, and the box body 17
Large air circulation holes 17a and 17b are bored in the center of the upper and lower walls, respectively, so as to face each other. Therefore, as shown in FIG.
It communicates with the inside of the base part 13 through the communication hole 17.
It communicates with the inside of the grip portion 15 through b and f. Note that in FIGS. 1 and 2, reference numeral 17c indicates a light receiving window in which a photometric charge conversion element (not shown) is disposed correspondingly.

- As shown in FIG. 3, a power storage pack 21 containing a number of power supply batteries (not shown) is removably attached to the grip part 5. As shown in FIG. 5, a through hole 21a is formed in the upper and lower walls of the lower end bulging portion 21, allowing communication between the inside of the grip portion 15 and the inside of the bank 21. In addition, power storage pack 21
There is a through hole 2 in the lower wall of the pack 21 that communicates the inside of the pack 21 with the outside.
1b is drilled.

7. The through hole 13c of the base portion 13 and the through hole 21b of the power supply storage pack 21 are bent to prevent foreign matter from entering from the outside.

FIG. 6 shows an electric circuit of the strobe device shown in FIG. 3 above. The electric circuit of this strobe device includes a first r, (4th DC power supply E, . . .
4 having the same configuration, each driven separately by E4
There are four DC-DC controllers (1) CC, ~DCC, and these four controllers (1) CC.

~ Two main capacitors CM, through DCC4i.

0M2 is charged to cause two flash discharge tubes PL, FL2 to emit flash light.

The above DC-DCC set -TaDeC,~L)CO, is explained by taking the converter (-Ta1)CC as an example.A step-up transformer lr, a P, NP type feedback transistor Q1, NPN type main transistor Q21Qa and NP
It is composed of an N-type switching transistor Q, a current superimposition capacitor C1, a back electromotive force absorption capacitor C2, rectifying diodes I), D2, and a resistor R1.

The above-mentioned first DC power supply J (, is connected to the common ground line L.K at its positive terminal, and the main transistor Q, at its negative terminal).
, Q, respectively.

In the step-up transformer T1, one end of the primary winding P is connected to the common ground line lo, the other end is connected to the collector of the main transistor Q21Q, and one end of the secondary winding P is connected to the base of the feedback transistor Q1 and the switching The emitter of the transistor Q4 and the other end are connected to the anode of the rectifying diode J]1, respectively. The feedback transistor Q1 connects its emitter to the operating voltage supply line h
, the collector is connected to the main transistor Q2 through the resistor R1.
The bases of Q, K - t ft , are connected by sore.

Also, connect the base to the resistance axis by 1+ & main transistor Q2.
．． are connected to the emitters of Q, respectively, and
It is also connected to line 12 via capacitor C2k. Main transistor Q2. A resistor R3 is inserted between the base and emitter of Qs, and a current superimposition capacitor C
+ [, connected between the emitters of the main transistors Q, , Q, and line 12. In addition, the collector of the switching transistor Q4 is connected to all lines 1ltK, and the base is connected to the emitter of the transistor Q4 through a resistor R4. It is connected.

Further, the cathode of the rectifying diode D is connected to the anode of the rectifying diode D.

The cathode of the rectifying diode D2, which serves as the output end of the DC-DCC set, is connected to one end of the photoelectric voltage detection capacitor C8, respectively.

At the same time, a diode Da'e is connected to one end of the main capacitor CM through the diodes D, , and D4.
The two main capacitors CM and CM are respectively connected to one end of the other main capacitor CM. The above charging voltage detection capacitor Cs
t/'i, the main capacitor C connected at the other end to the common ground line 16 and at the other end to the line l.
It is designed to be charged to the same voltage as M, , 0M2. A voltage dividing circuit consisting of a series circuit of resistors R6 and R7 is connected in parallel to the capacitor C6, and the other end of the neon rung Net is connected to the connection point between the resistors R♂ and R2. The photoelectric voltage of capacitor C8 is resistor R
,, the voltage is divided by R7 and the voltage applied to the resistor f<,7 is f
f! When the voltage exceeds the light emission starting voltage of the neon lamp Ne1, the load stored in the capacitor C3 follows the resistor R6 and the neon lamp Ne+, and flows into the base of the switching transistor Q4 of the DC-DC converter DCC, ~DCC4. , each transistor Q4 is turned on, and each feedback transistor Q1 is turned off.

Therefore, D C-1) C converter DCC.

~Dcc, +i stops operating. The capacitance of capacitor C1 is set to be extremely small compared to the capacitance of main capacitors CM, CM2, and therefore capacitor Cs01 immediately discharges and starts operating again when the neon lamp Net turns off. 1) C-DC converter 1) C
It will be photoelectronized again by O1~DCC. In this way, the capacitor 03 repeatedly charges and discharges, works in cooperation with the neon lamp Ne+, ) transistor Q1, etc., to maintain the charging voltage of the main capacitors CM, CM2O to approximately the specified voltage.

Ki1 and a power switch SW are provided between the operating voltage supply line 12 and the common ground line 1o. This power switch SWI is formed by a changeover switch, and the movable contact terminal C is connected to line l. is connected to −
Fixed terminal A of 10,000 is connected to line l. Therefore, when switching the movable contact piece to fixed terminal A, switch SW
, connect 7% between line lo, it through h, each DC
-DC near y /< -I DCC, ~L) An operating voltage is supplied to CC4. Further, the other fixed terminal B of the switch swI is connected to one of the light emission control circuits ICC.

When the movable contact piece is connected to the fixed terminal B and the fixed terminal B is connected to the customer j) C-DC converter D CC',
~The operating voltage is no longer supplied to DCC4, and its operation stops, and at the same time, a light emission prevention signal is manually input to the light emission control circuit IOC, and the flash 1! Pipe F4. ．． , P.L.
is in a state where the light emission is blocked.

The operating voltage supply line 4 and the common ground line l are drawn out from one end of the above-mentioned main capacitor CMI. One light emission control circuit IOC is connected between the line 11 and this light emission control circuit ICO.
A parallel circuit of a coil LI and a diode 1) 6 is connected to a series circuit of one flashlight 1.i: a tube FJ, . In addition, the operating voltage supply line l drawn out from one end of the other main capacitor CM2 and the common ground line 1
The other light emission control circuit CC2 is connected between the line 13 and the light emission control circuit IOC, and a coil L3. Diode D.

A parallel circuit of the flash discharge tube FL and a series circuit of the other flash discharge tube FL are connected. Note that the trigger electrodes FL and PL of the flash discharge tubes FL and FL (4, respectively a) are connected to one of the light emission control circuits IOC, and the flash light emission is started based on the output of the same circuit IOC. It has become so.

In addition, in parallel with the above -10,000 main capacitor CM,
Resistance ratio 8.几. A series circuit of a synchronizing contact SW2 and a synchronizing contact SW2 arranged next to the camera is connected. Further, a resistor R0° is connected in parallel to the synchro contact 8W, and a connection point between the resistor R9 and the contact SW2 is connected to the light emission control circuit CC1. Therefore, luminous! IWhat circuit I
CO, is triggered by the closing of contact SW, and starts the flash light emission of flash discharge tubes F'L,, PL,.

Furthermore, between the above lines l, , and zo, there is a photometric circuit P.
MC, is connected. This photometric circuit PMC has a photoelectric conversion element (not shown) for both parties, and integrates the 1xi current generated in this photoelectric conversion element to set the light emission control circuit IOC at a predetermined exposure level. , Ice, and Krx to output an automatic dimming signal to them.

In the strobe device circuit configured as described above, when the power switch SWl is switched to the fixed terminal A, a DC power source G is supplied to each DC-DCC set DCC, to DCC4 through the operating voltage supply line 12. , -E4 are supplied with operating voltage, and the converters DCC, ~DCC.

starts operating. Each DC-DCC set-taDCC, ~
Since the operation of DCC, is the same, converter DC
C. For all examples, first, current flows through the emitter-base of the feedback transistor Q1 and the resistor Rye, turning on the transistor Q1.

At the same time, a light current flows through the current superimposition capacitor CI, and the capacitor C8 is connected to the line! , photoelectricity is applied with Gawa as positive. When the transistor Q1 is turned on, the main transistors Q2 and Q3 are turned on, and the sum of the current flowing out from the DC power supply E and the electric charge charged in the capacitor C2 flows through the primary winding P of the step-up transformer T1.

When the primary winding current flows through the step-up transformer T1, a high induced voltage is generated in the secondary winding S of the transformer '■゛1.
A positive feedback current flows through the main capacitors C, M, CM, etc., and the primary winding current further increases.

Then, when the primary winding current increases to a certain degree and once begins to decrease, the back electromotive force generated in the secondary winding S is applied to the base of the feedback transistor Q1, turning off the transistor Q1. At this time, the back electromotive force generated in the secondary winding S is
Buffered by capacitor C2, transistor Q is prevented from being destroyed. When transistor Q1 turns off, main transistor Q2. Q is also turned off, and the energy stored in the primary winding P is generated as a back electromotive force. With the generation of this back electromotive voltage, an LC oscillation circuit is formed between the winding and various distributed capacitors existing between the common lines, and vibration starts. This oscillating voltage is also transmitted from the primary winding P to the secondary winding S, but in the cycle in which the transistor Q1 is positively biased, the transistors are again looked at, and the main transistor Q2. Turn Qs on. The oscillation is repeated by pressing the button in the same manner.

Other 1) The C-DC converters DCC2 to Dcc4 self-oscillate in the same way as the converter DCC described above, but when they self-oscillate, the main capacitors CM1, CM1, . The positive feedback current flows through CM2, and the capacitors CM, CM, and CM are charged. In addition, each DC-DC converter DCC,
~ Even if the phase of the oscillation of DCC4 is shifted, each converter D
There is no possibility that circulating current will flow between CC and DCC. Then, when the photoelectric voltage of the main capacitors CM, , CM, reaches the specified voltage, the neon lamp Ne+ for indicating completion of charging is lit, and this lighting current turns on the switching transistor Q, and the DC-DC converter D is turned on.
The operations of CC, ~DCC, are temporarily stopped.

As described above, the strobe device of the present invention is configured. According to this strobe device, the circuit boards 19a and 19b to which the power booster circuit 18 is attached are provided on the upper part of the grip part 15, and Flow holes 17a, 17 on the face wall
Since it is disposed vertically in the box 17 in which the holes b are perforated, an air flow as shown by the arrow in FIG. When the power booster circuit 18 operates and generates heat, the air inside the box body 17 is warmed and expands, rising into the base 13 through the circulation hole 17a and being discharged to the outside through the through hole 13c. At the same time, cold air from the outside flows through the through hole 21b.

21a and flow hole 17b fi) into the box body 17. Therefore, air does not stagnate near the power supply booster circuit 18, and heat accumulation can be minimized. Therefore, it is possible to prevent performance degradation and failure of the strobe device due to heat generation in the power booster circuit 18.

In the above embodiment, only one pair of large communication holes 17a and t7b are formed in the box body 17, but as shown in FIG. 7, a small communication hole 17d is provided.

It goes without saying that even if a plurality of pairs of holes 17e are bored in the upper and lower walls, the same depth of action and effect can be obtained.

As described above, according to the present invention, the cooling effect of the power supply booster circuit can be obtained by the air flow, so that the present invention is small and lightweight and eliminates the conventional drawbacks mentioned in the specification.
However, it is possible to provide a bounce-type strobe device that requires a short charging time.

[Brief explanation of drawings]

FIG. 1 is an enlarged perspective view showing the configuration of a typical circuit board; FIG. 2 is a diagram showing the relationship between the maximum rated power of a transistor and the ambient temperature; FIG. FIG. 4 is an enlarged perspective view showing how the circuit board is arranged in the strobe device shown in FIG. 3, and FIG. 5 is a perspective view of the strobe device shown in FIG. 3 above. 6 is an electrical circuit diagram of the strobe device shown in FIG. 3 above, and FIG. 7 shows the air circulation holes shown in FIG. FIG. 1 is a diagram illustrating an example of the arrangement of the board. , 17d, 17e - Distribution hole 18
...... Power boost circuit 19a, 19b...Circuit board

Claims (1)

[Scope of Claims] A strobe device in which a main body of a light emitting part can be rotated relative to a grip part, wherein a circuit board to which a power booster circuit is attached is provided above the grip part; A strobe device characterized in that it is arranged vertically inside a box body with air circulation holes formed in the upper and lower walls.