JP2000098460A - Film unit with lens - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a film unit with a lens capable of realizing the reduction of cost and the improvement of stability in operation and diversifying the informing of a charging state. SOLUTION: This film unit is provided with a power source, a booster circuit 31 equipped with an oscillation transformer TR1 having a primary winding to a tertiary winding, an oscillation transistor Q connected to the primary winding of the transformer TR1 in series, and a main switch SW connected to the base of the transistor Q and a connection point between the secondary winding and the tertiary winding and increasing voltage from the power source, a strobe light emission circuit emitting light by supplying high voltage from the circuit 31 to a main capacitor MC connected in parallel with a strobe light emitting tube Xe so as to charge the capacitor MC and triggering the tube Xe to which the charge voltage of the capacitor MC is applied by a trigger circuit consisting of a trigger capacitor C, a trigger switch TSW and a trigger coil TR2 connected to the main switch SW in series, and a stroboscopic circuit 30 having a light emitting diode LED connected to both ends of the tertiary winding of the transformer TR1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens-equipped film unit having a flash unit integrated with a camera body.

[0002]

2. Description of the Related Art FIG. 7 shows an example of a strobe circuit constituting a strobe device in a conventional film unit with a lens.
The operation is described below. In the flash circuit shown in FIG. 7, BT is a power supply composed of, for example, an AA battery. When performing flash photography, an external operation member is operated to operate a main switch SW11 and a light emission stop switch SW1.
2 is turned on, the DC voltage from the power supply BT is supplied to the oscillation transistor Q, the oscillation transformer T11, and the resistor R11 via the main switch SW11 to perform an oscillation operation, and the low-voltage DC voltage is converted to a high-voltage AC voltage. Convert.

[0003] The AC voltage output from the oscillation transformer T11 is rectified by the diode D and becomes a DC voltage to charge the main capacitor C11. The resistance R12
, The trigger capacitor C12 is also charged. Then, when the voltage of the trigger capacitor C12 reaches a predetermined voltage, this voltage is applied to the resistor R13 and the neon tube Ne as an indicator lamp, and the neon tube Ne starts discharging and lights up.

After the neon tube Ne is turned on,
When a release button of a film unit with a lens (not shown) is pressed, the shutter blades open, and when fully opened, the trigger switch TSW is turned on. When the trigger switch TSW is turned on, the charge stored in the trigger capacitor C12 is transferred to the primary winding T12 of the trigger coil T12.
21 and a high voltage is induced in the secondary winding T22, and the high voltage triggers the trigger electrode G of the flash tube Xe.

As a result, the ionized xenon atoms in the flash tube Xe collide with the electrons ejected from the cathode and are excited, so that the flash tube Xe emits light.

When the main switch SW11 is turned off while the main capacitor C11 is charged and the neon tube Ne is lit, the oscillation operation of the oscillation transistor Q stops.

Since the light emission stop switch SW12 is also turned off at the same time, the neon tube Ne is turned off. Therefore, even if the release button is pressed to turn on the trigger switch TSW, the discharge path of the trigger capacitor C12 is cut off. , The flash tube Xe does not emit light.

[0008]

However, in the conventional circuit described above, the main capacitor C is not used when the strobe is used.
And a light emission stop switch SW12 for turning off the neon tube Ne and preventing the flash tube Xe from emitting light even when the main capacitor C11 is charged even when the strobe is not used.
And two switches were required. For this reason, the number of switches is large, so that the cost of the lens-fitted film unit cannot be reduced, and a malfunction of the switch causes malfunction of the strobe device.

Further, in the case of the conventional film unit with a lens, since the neon tube Ne is used as an indicator lamp for notifying the state of charge, the cost of parts is high.
In addition, since the emission color is also limited, there is a problem in that the degree of freedom regarding the notification of the state of charge of the film unit with a lens is limited.

[0010] The present invention has been made in view of the above-described problems, and by reducing the number of switches, it is possible to reduce the cost and improve the operation stability, and to diversify the notification of the state of charge. A lens-equipped film unit with a possible strobe circuit is provided.

[0011]

According to the first aspect of the present invention,
In a film unit with a lens, in which a strobe device is integrated with a camera body containing a film which has not been exposed beforehand, a DC power supply, an oscillation transformer having primary winding to tertiary winding, and a primary winding of the oscillation transformer A booster circuit for boosting a voltage from a DC power supply, having an oscillation transistor connected in series to a line, a main switch connected to the base of the oscillation transistor and a secondary winding, and turned on and off by manual operation; A high voltage from the circuit is supplied to a main capacitor connected in parallel with the strobe light emitting tube, and the main capacitor is charged, and a trigger capacitor, a trigger switch, connected in series with the main switch,
A strobe light emitting circuit that triggers the strobe light emitting tube to which the charging voltage of the main capacitor is applied by a trigger circuit including a trigger coil to emit light; and a light emitting diode connected to both ends of a tertiary winding of the oscillation transformer. A strobe circuit is provided.

According to the present invention, the boosting circuit and the strobe light emitting circuit are operated by turning on the single main switch, and the main capacitor is charged and the trigger capacitor is charged. The trigger preparation for the strobe light emitting tube of the circuit can be completed, and the cost can be reduced and the operation stability can be improved by reducing the number of switches. In addition, since the connected light emitting diodes are connected to both ends of the tertiary winding provided in the oscillation transformer, it is possible to diversify the notification of the charged state by selecting various emission colors of the light emitting diodes. Becomes

According to a second aspect of the present invention, in the film unit with the lens according to the first aspect, the DC power supply uses a AAA type battery.

According to the present invention, since a AAA battery is used, the space occupied by the power supply can be reduced.

According to a third aspect of the present invention, in the film unit with the lens according to the first or second aspect, the main capacitor is set to a capacitance value in a range of 30 to 90 μF.

According to the present invention, the main capacitor is 3
Since the capacitance value is set in the range of 0 to 90 μF,
A strobe circuit can be assembled by using a low-cost and easily available main capacitor without using a special capacitor as a main capacitor.

According to a fourth aspect of the present invention, there is provided a film unit with a lens including a strobe device and a light emitting diode for notifying a charging state of the strobe device in a camera body containing an unexposed film. An optical member for guiding the light in two directions, the object side and the upper side, is provided.

According to the present invention, the light of the light emitting diode for notifying the charging state of the strobe device can be visually recognized from the subject side and from above the camera body, so that both the subject and the photographer can use the light of the strobe device. The state of charge can be reported.

[0019]

FIG. 1 is a block diagram showing an embodiment of the present invention.
This will be described with reference to FIGS.

FIG. 1 is a perspective view of a film unit with a lens as viewed from the front, FIG. 2 is a perspective view of the film unit with a lens as viewed from the back, and FIG. It is a circuit diagram of a circuit.

In the film unit with lens according to the present embodiment shown in FIGS. 1 to 3, the front and rear portions of a main unit (not shown) having main components are covered with a front cover 11 and a rear cover 12 made of synthetic resin. The camera body 13 is provided with a strobe device provided with a fixed strobe light emitting section 14 at the right end of the upper surface of the camera body 13. The rear cover 12 has no back cover for attaching and detaching the film, and has a sealed structure in which the front cover 11 and the rear cover 12 cannot be disassembled without using a disassembly tool. .

The camera body 13 is provided with the above-mentioned strobe light-emitting portion 14, a photographing lens 16, a finder window 17 and a strobe switch operator 18 on the front, and a shutter release button 19 and a film counter window 20 on the top.
And a charging confirmation window 21 are provided.

As shown in FIG. 2, a dial-type film winding knob 22 and a finder eyepiece window 23 are provided on the rear surface of the camera body 13.
A power supply BT using AAA batteries is accommodated in a battery chamber (not shown) provided at the inner bottom of the battery.

The strobe switch activator 18 is of a slide type that moves laterally in a guide groove 24 below the strobe light emitting section 14.
At a position where the outer end protrudes from one side of the camera body 13, a main switch MSW provided in a strobe circuit 30 in the camera body 13 is turned on, and strobe charging is started.
Also, the strobe switch actuator 18 has the inner end formed with the guide groove 2.
In the position where the main switch MS is in contact with the inner side wall of the main switch MS4,
W is turned off to stop charging.

Inside the charge confirmation window 21, the camera body 1
A light-emitting diode LED mounted as an indicator lamp for notifying the charging state is provided in the strobe circuit 30 in 3, and the completion of strobe charging is notified by the light emission of the light-emitting diode LED.

The strobe light emitting section 14 accommodates a strobe light emitting tube (xenon tube) Xe.
The lighting of e and the lighting of the light emitting diode LED described above are:
The operation is performed by the operation of a flash circuit 30 mounted in the camera body 13.

Here, referring to FIG.
Will be described in detail.

A strobe circuit 30 shown in FIG. 3 includes a booster circuit 31 for boosting a DC voltage from a power supply BT using a AAA type dry cell to a required DC high voltage required for light emission of a flash tube Xe. The high voltage from the booster circuit 31 is supplied to a main capacitor MC set at a capacitance value in the range of 30 μF to 90 μF, which is easily available at a low price, and charges the main capacitor MC to emit a flash tube Xe. LE for lighting the strobe light emitting circuit 32 and the light emitting diode LED to indicate the state of charge to the main capacitor MC and to notify the user of forgetting to turn off the strobe switch operator 18
And a D lighting circuit 33.

The booster circuit 31 has an oscillation transformer TR1 having a primary winding W1, a secondary winding W2, and a tertiary winding W3, a collector connected to the primary winding W1 of the oscillation transformer TR1, and a power supply BT. , A rectifying diode D having a cathode connected to the secondary winding W2 of the oscillating transformer TR1, a base of the oscillating transistor Q, a secondary winding W2, and a tertiary winding. It has a main switch SW that is turned on and off by manual operation connected to the connection point of W3, and a resistor R1 connected to the connection point of the secondary winding W2 and the tertiary winding W3 and the anode of the power supply BT. are doing.

The tertiary winding W3 is not necessarily the secondary winding W
It is not necessary to be connected to 2 by a wire connection, but may be electromagnetically coupled. In this case, the oscillation transistor Q
, The main switch SW, and the resistor R1 are connected only to the secondary winding W2 without being connected to the tertiary winding W3.

The primary winding W1 of the oscillation transformer TR1 has four turns, the secondary winding W2 has 900 to 1000 turns,
The tertiary winding W3 is composed of 5 to 7 turns. The resistance value of the resistor R1 is 10KΩ to 100K.
It is set in the range of Ω.

The power supply BT is connected to the primary winding W1 of the oscillation transformer TR1 and the emitter of the oscillation transistor Q.

The strobe light emitting circuit 32 supplies the high voltage from the booster circuit 31 to a main capacitor MC connected in parallel with a strobe light emitting tube Xe using a xenon lamp, charges the main capacitor MC, and charges the main switch SW. Trigger capacitor C connected in series with
A trigger circuit including a trigger switch TSW and a trigger coil TR2 causes the charging voltage of the main capacitor MC to trigger the strobe light emitting tube Xe applied between the anode and the cathode to emit light.

A resistor R2 is connected between the anode of the diode D and the connection point of the trigger capacitor C and the trigger switch TSW. The resistance value of the resistor R2 is 1 MΩ
To 4.5 MΩ.

The capacitance value of the trigger capacitor C is set in a range from 0.022 μF to 0.033 μF.

The LED lighting circuit 33 includes a light emitting diode LED on both terminals of the tertiary winding W3 of the oscillation transformer TR1.
And a series circuit of a resistor R3. The resistance value of the resistor R3 is set in a range of 1Ω to 20Ω.

The strobe circuit 30 of the present embodiment is configured as described above. The main switch SW is closed by turning on the strobe switch operator 18, and the DC voltage from the DC power supply BT passes through the resistor R1. Is supplied to the base of the oscillation transistor Q, whereby the oscillation transistor Q is turned on and starts oscillating.

By the oscillating operation of the oscillating transistor Q, an AC high voltage is induced in the secondary winding W2 of the oscillating transformer TR1. The high voltage of the secondary winding W2 is rectified by the diode D and becomes a DC voltage to charge the main capacitor MC.

Further, the charging of the trigger capacitor C is started together with the charging of the main capacitor MC by the DC voltage.

The tertiary winding W3 of the oscillation transformer TR1
Also, a predetermined AC voltage is induced based on the number of windings. One peak voltage of the AC voltage generated in the tertiary winding W3 increases as the charging voltage of the main capacitor MC increases. A light emitting diode L mounted such that this increasing peak voltage is applied as a forward voltage
In the ED, when the peak voltage exceeds a predetermined value, the current starts flowing and the flowing current increases due to the increase in the peak voltage, and the light emitting diode LED of the LED lighting circuit 33 lights to notify the charging state.

After the light emitting diode LED emits light,
When the shutter is operated by pressing the shutter release button 19, the trigger switch TS is actuated by shutter blades.
When W is closed, the electric charge accumulated in the trigger capacitor C flows through the primary winding W11 of the trigger coil TR2 as an instantaneous current, and the instantaneous current causes a pulse-like voltage generated in the secondary winding W12 to change the gate voltage of the flash tube Xe. G is triggered, a high voltage is applied from the main capacitor MC to the strobe light emitting tube Xe, and the strobe light emitting tube Xe is turned on and emits light to perform strobe shooting.

As described above, the film unit with a lens according to the present embodiment includes a main switch SW, a trigger switch TSW, a trigger capacitor C, and a trigger coil T.
R2 is connected in series, one single pole single throw simple switch can be used as the main switch SW, the number of switches can be reduced compared to the conventional example, the strobe circuit can be reduced in cost, and the failure factor And the operation stability is improved.

Further, by only turning on the main switch SW, the main capacitor MC can be charged, and the trigger capacitor C can be charged.
The trigger preparation for the strobe light emitting tube Xe of the trigger circuit including the trigger switch TSW can be completed.

Further, the LED lighting circuit 33 has a configuration in which light emitting diodes LED, which are inexpensive as compared with a neon tube as in the conventional example, are connected to both terminals of the tertiary winding W3 of the oscillation transformer Q. Is a separate circuit, the lighting function of the light emitting diode LED can be set independently without affecting the charging characteristics of the main capacitor MC by the booster circuit 31, and the cost of the strobe circuit can be reduced. it can.

In addition, the light emitting diode LED can select elements of various luminescent colors, such as red and yellow, as compared with the neon tube, thereby making it possible to diversify the notification of the state of charge of the main capacitor MC.

Furthermore, since a AAA battery is used as the power supply BT, the space occupied by the power supply BT can be reduced.

Next, with reference to FIG. 4 to FIG. 6, a description will be given of a structure for notifying the charging state by the light emission of the light emitting diode LED13 attached to the camera body 13. FIG.

In the example shown in FIG. 4, a light emitting diode LED is mounted on a strobe board 40 arranged inside the front cover 11 of the camera body 13, and light from the light emitting diode LED is transmitted to two reflecting surfaces 41a, A prism 41 having a substantially L-shape as a whole having 41b is used to guide the light from the emission surface 41c to the front of the front cover 11, that is, to the subject (subject) side.

According to this structure, the state of charge of the main capacitor MC by the light emission of the light emitting diode LED13 can be notified to the object side, and the line of sight of the object can be reliably guided toward the film unit with the lens.

The example shown in FIGS. 5 and 6 is different from the prism 41 shown in FIG. 4 in that a vertical optical path 42 for guiding light from the light emitting diode LED right above is added.
1A, the light from the light emitting diode LED is guided from the light emitting surface 41c to the front of the front cover 11, and the light from the light emitting diode LED is also guided from the light emitting surface 42a to the upper surface side of the camera body 13. It is.

According to this structure, the subject can be notified of the state of charge of the main capacitor MC, and
The photographer of the film unit with the lens can also be notified of the state of charge of the main capacitor MC.

[0052]

According to the present invention, the number of switches can be reduced to reduce the cost and improve the operation stability.
It is possible to provide a lens-equipped film unit provided with a strobe circuit capable of diversifying notification of a charged state by selecting various emission colors of light-emitting diodes.

Further, according to the present invention, it is possible to provide a lens-fitted film unit capable of reducing the size and cost of a strobe circuit.

Further, according to the present invention, it is possible to provide a film unit with a lens capable of informing both the subject and the photographer of the charging state of the flash device.

[Brief description of the drawings]

FIG. 1 is a perspective view of a film unit with a lens according to an embodiment of the present invention as viewed from the front.

FIG. 2 is a perspective view of the lens-equipped film unit of the present embodiment as viewed from the back.

FIG. 3 is a circuit diagram of a strobe circuit constituting a strobe device of the film unit with a lens according to the present embodiment.

FIG. 4 is a schematic sectional view showing a structure for guiding light from a light emitting diode in the film unit with a lens according to the present embodiment.

FIG. 5 is a schematic sectional view showing a structure for guiding light from a light emitting diode in the film unit with a lens according to the present embodiment.

FIG. 6 is a perspective view of a prism constituting a light guiding structure used in FIG.

FIG. 7 is a circuit diagram of a flash circuit constituting a conventional flash device.

[Explanation of symbols]

 Reference Signs List 11 front cover 12 rear cover 13 camera body 14 strobe light emitting part 15 paper cover 16 photographing lens 18 strobe switch operator 19 shutter release button 20 film counter window 21 charge confirmation window 30 strobe circuit 31 booster circuit 32 strobe light emitting circuit 33 LED lighting circuit 41 Prism BT Power supply C Trigger capacitor D Diode LED Light emitting diode MC Main capacitor SW Main switch TR1 Oscillation transformer TR2 Trigger coil TSW Trigger switch Xe Strobe arc tube

Claims (4)

[Claims] 1. A lens-equipped film unit having a strobe device integrated with a camera body containing a film which has not been exposed beforehand, comprising: a DC power supply; an oscillating transformer having primary to tertiary windings; A booster for boosting a voltage from a DC power supply, having an oscillation transistor connected in series to a primary winding of a transformer, and a main switch connected to the base of the oscillation transistor and the secondary winding and turned on and off manually. Circuit, and a high voltage from the booster circuit is supplied to a main capacitor connected in parallel with the strobe light emitting tube to charge the main capacitor and a trigger comprising a trigger capacitor, a trigger switch, and a trigger coil connected in series with the main switch. The strobe light emitting tube to which the charging voltage of the main capacitor is applied by a circuit A film unit with a lens, comprising: a strobe light circuit having a strobe light emitting circuit for triggering light emission; and a light emitting diode connected to both ends of a tertiary winding of the oscillation transformer. 2. The film unit with a lens according to claim 1, wherein the DC power supply uses a AAA battery. 3. The main capacitor has a capacity of 30 to 90 μF.
2. The capacitance value is set in the range of
Or the film unit with a lens according to 2. 4. A lens-equipped film unit comprising a camera body containing an unexposed film and a strobe device and a light emitting diode for notifying a charging state of the strobe device, wherein light from the light emitting diode is transmitted to a subject side. A film unit with a lens, comprising an optical member for guiding in two directions, upper and lower.