JPH1078604A - Film unit with lens - Google Patents

Abstract

PROBLEM TO BE SOLVED: To optionally make light emission by a stroboscope impossible when photographing with strobe light is not performed by providing a switch for making the light emission by the stroboscope impossible in a stroboscopic circuit. SOLUTION: The stroboscopic circuit is provided with a light emission inhibiting switch SW1 being the switch for making the light emission by the stroboscope impossible and a charge inhibiting switch SW2 being the switch for making the light emission by the strobosocpe impossible by inhibiting a main capacitor C1 from being charged on a loop where the discharge current of a xenon discharge tube Xe flows. A light emission inhibiting switch button is constituted to turn off the switch SW1 in the stroboscopic circuit by depressing a release button in a state where the light emission inhibiting switch button is depressed in the case photographing with strobe light is not performed, so that the loop where the discharge current of the xenon discharge tube Xe flows is cut off and photographing is performed without making the stroboscope emit light.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a film unit with a lens, and more particularly to a film unit with a lens having a strobe.

[0002]

2. Description of the Related Art A lens-equipped film unit having a strobe is provided so that a power supply battery for emitting a strobe light is not wasted, and that a battery can be reused to reduce costs and prevent environmental pollution. Various improvements have been made so that a small battery can be used to make the camera body as small as possible.

For example, in order to prevent unnecessary consumption of the power battery due to forgetting to turn off the strobe switch when using the strobe, the strobe switch is a push button type and the strobe circuit is turned on only by pressing once, and the main capacitor of the strobe circuit is turned off. There is provided a film unit with a lens configured to automatically turn off a charging circuit when charged to a voltage at which a strobe can emit light. And such a film unit with lens,
When taking a picture, the strobe light is emitted and the picture is taken, but when the picture is taken, the main capacitor of the strobe circuit starts charging immediately, and it starts preparing for the next picture, and when the charge is completed, it is charged as described above The circuit will be turned off automatically.

[0004] By doing so, wasteful consumption of the battery is eliminated, so that it is not necessary to dispose of a large amount of the consumed battery, and it is possible to reuse the battery of the film unit with the photographed lens by recycling, so that the environment is environmentally friendly. And cost-effective results are being gained.
Further, such an improvement makes it possible to reduce the size of the power supply battery, thereby making the camera body compact.

[0005]

On the other hand, however, the above-described flash circuit performs flash photography in which the flash always emits light during photography. Therefore, flash photography is performed even in a bright place where it is not necessary to fire the flash,
That consumes the battery. In a place where flash photography is prohibited or where flash photography is not desired, the main capacitor must be discharged to turn off the neon tube indicating that charging has been completed, and the flash must not be emitted before photography can be performed. Further, in a factory for assembling a film unit with a lens, if an operator accidentally presses the strobe switch for a moment during the assembly line, or charging of the main capacitor is started for some electrical reason such as static electricity. In such a case, if the strobe emits light in some time, in the case of an unfinished film unit with a lens, there is a concern that the film may be covered.

In addition, lead in solder used for a circuit board of a film unit with a lens is harmful due to environmental pollution, and it is necessary to immediately switch to a lead-free solder.

The present invention has been made to solve the above problems. That is, when flash photography is not performed, the flash light emission is arbitrarily disabled, and charging of the main capacitor of the flash circuit is arbitrarily prohibited to disable the flash light emission, and lead-free solder that does not pollute the environment is used. It is an object of the present invention to provide a lens-equipped film unit having a flash circuit board as described above.

[0008]

The object of the present invention is achieved by adopting the following constitution.

That is, the charging of the main capacitor for emitting the strobe is started by turning on the charging start switch of the strobe circuit, and the charging state is continued even after the switch is turned off, and the voltage of the main capacitor causes the strobe to emit light. In a film unit with a lens having a strobe circuit for stopping the charging when the voltage becomes possible and synchronizing the shutter opening and closing operation with a strobe circuit,
A film unit with a lens, wherein a switch for disabling strobe light is provided in the strobe circuit.

[0010] A film unit with a lens, comprising a circuit mounted using lead-free solder.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described in detail with reference to FIGS. 1 to 7. First, an example of a film unit with a lens used in the present invention will be described with reference to FIGS.

FIG. 1 is a front view of a film unit with a lens, FIG. 2 is a cross-sectional view for explaining the internal structure of the film unit with a lens, FIG. 3 is an exploded perspective view of the film unit with a lens, and FIG. It is a perspective view of the exterior body attached to the outside of a unit and covering the film unit with a lens.

The lens-equipped film unit is a simple camera unit which is provided on the market with a photographic film (hereinafter referred to as a film) loaded therein. The film is loaded in an assembling process of the lens-equipped film unit. This eliminates the need for loading and rewinding, and allows for immediate shooting.

1, 2, 3, and 4, the present lens-fitted film unit 1 has a front cover 1
2 and the rear cover 13 are assembled from both sides. In the center of the unit main body 11, a photographing frame 14 is provided. A cartridge storing chamber 15 of a cartridge P which is a cartridge for storing a film in one of the left and right sides of the photographing frame 14 is provided. Is provided. A patrone P is stored in the patrone storage room 15, and a film F wound around a spool S is stored in the film roll storage room 16, and the film F is wound one by one by the winding mechanism 21 at the time of shooting. It is wound up.

The patrone or film used here may be a commonly used international standard ISO 100.
In addition to the 135 mm film cartridge (patrone) and the normal 135 mm film specified in No. 7, other Japanese Patent Application Laid-Open Nos. Hei 3-126029, Hei 2-272538 and Hei 3-179342 disclose. As disclosed, a cartridge capable of sending out a film housed inside by rotating the rotation shaft of the cartridge to the outside of the cartridge, and a film disclosed in JP-A-7-219146. good.

The hoisting mechanism 21 is composed of a hoisting knob 22 and other hoisting mechanism components, and is disposed from above the patrone storage chamber 15 to above the photographing frame 14. A lens L is provided. Further, a finder FD is arranged above the photographing frame 14.

The lens-equipped film unit 1 is provided with a strobe device E1. The strobe circuit board E2 of the strobe device E1 is assembled on the front side of the film roll storage chamber 16. A circuit element E3 is arranged on the strobe circuit board E2, and a discharge tube E7, which is a xenon discharge tube, is connected to an upper position. The discharge tube E7 faces the strobe light emission window 23 of the front cover 12.

A main capacitor E4 is connected to a position below the flash circuit board E2, and a battery E5 is connected to the flash circuit board E2 by a lead plate E6. Then, the discharge tube E7 is caused to emit light by the current charged in the main capacitor E4 from the battery E5. A strobe switch knob E8 is provided below the strobe light emission window 23, and the strobe switch knob E8 is used for flash photography.
Move 8 and turn on the power.

In the film unit with lens 1 thus constructed, its usage and precautions are described.
As shown in the figure, openings are formed at the locations required for the shooting function, such as the strobe light emission window hole, shooting lens hole, finder hole, counter hole, and strobe charge completion display hole, and the design etc. to clean the appearance is applied. In addition, a paper exterior body 19 for protecting the film unit with lens 1 from impact is covered. The material of the exterior body is not limited to paper, but may be a plastic sheet, or may be a seal-like material that is directly attached to the main body and fixed.

Next, an embodiment of the present invention will be described with reference to FIGS. 5 to 7, but the present invention is not limited to this embodiment.

FIG. 5 is a circuit diagram of a strobe light for explaining the present invention. FIG. 6 is a view for explaining operation buttons provided on a lens-equipped film unit for turning on / off a switch of a flash circuit of the present invention. FIG. 7 is a view showing a modification of the position where the grip switch button is provided in the lens-equipped film unit having the strobe switch of the grip switch.

Referring to FIG. 5, the flash circuit will be described first.

In the strobe circuit shown in FIG. 5, it is assumed that a light emission inhibition switch SW1 and a charge inhibition switch SW2 according to the present invention, which will be described in detail later, are both turned on.

To set the flash circuit in the flash photography mode, the flash switch SW is turned on. The strobe switch SW is a push button type switch, and is turned on by pushing the push button.

When a strobe switch SW serving as a charge start switch is turned on, a base current is supplied to a transistor Q2 serving as a second transistor through a resistor R1, and a collector current of the transistor Q2 is supplied to a base of an oscillation transistor Q1 serving as a first transistor. Since the current is supplied as a current, the oscillation transistor Q1 is turned on, and a current flows through the primary coil of the oscillation transformer TRA. This allows
A large voltage current according to the winding ratio flows through the secondary coil of the oscillation transformer TRA, and the main capacitor C1 is charged by the current rectified by the diode D1. When the current of the secondary coil increases, the base current of the oscillation transistor Q1 also increases via the transistor Q2, and accordingly, the collector current further increases, and the oscillation transistor Q1
Is in an oscillation state, and oscillation is continued by the back electromotive force of the secondary coil.

Once in the oscillation state, the oscillation of the oscillation transistor Q1 continues even if the strobe switch SW is turned off, and the main capacitor C1 is charged. The capacity of the main capacitor C1 is 80 to 120 μF.

When the main capacitor C1 is charged and the voltage of the neon tube Ne reaches 275-305V, the neon tube Ne is turned on. Further, as the charging of the main capacitor C1 proceeds, the voltage across the resistor R3 increases. When the voltage reaches a predetermined voltage, a Zener current flows through the Zener diode D2, and the base current of the transistor Q3 having a built-in resistor as the third transistor. Flows and the resistor built-in transistor Q3
Turns on, turning off the transistor Q2. Here, the voltage of the main capacitor C1 at which the oscillation stops is 295-
The zener voltage is set to 325V. For example, if the voltage between both ends of the neon tube Ne is 220 V, 90
This can be achieved by selecting a zener diode having a zener voltage of V. As a result, the oscillation transistor Q1 is also turned off to stop oscillation, and the current of the battery BT, which is a power supply, is also cut. Therefore, it is possible to prevent the battery voltage from being lowered due to forgetting to turn off the strobe switch.

As described above, once the strobe switch SW is pressed, the oscillation continues until the charging voltage required for strobe shooting is reached, and the oscillation stops when the voltage reaches the predetermined voltage, so that energy can be saved. I have.

When the oscillation of the oscillation transistor Q1 stops and the discharge of the electric charge of the main capacitor C1 progresses and the voltage decreases (after 5 to 15 minutes), the voltage of the neon tube Ne also decreases.
The neon tube Ne goes out. At the time of shooting, the neon tube Ne
When is turned off, the strobe switch SW may be turned on again.

When the camera is aimed at the subject and the shutter is released while the neon tube Ne is lit, the trigger switch TSW is turned on by the shutter opening / closing operation, and the trigger capacitor C3 is discharged through the primary coil of the trigger coil TRI. A high voltage is generated in the secondary coil of the TRI, and the xenon discharge tube Xe, which is a flash tube, emits light. When the xenon discharge tube Xe emits light, the base current of the oscillation transistor Q1 flows instantaneously due to the circuit voltage fluctuation due to the light emission current of the main capacitor C1, and re-oscillates. That is, continuous light emission can be performed without turning on the strobe switch SW.

Note that the resistor R2 is a charging resistor for the trigger capacitor C3, and the capacitor C2 prevents careless re-oscillation due to disturbance noise other than the emission current, for example, from a motor or relay near the camera. Things. Also, in the above-described component arrangement on the board incorporating the strobe circuit, the oscillation transistors Q1 and Q2 are arranged near the oscillation transformer TRA, and the Zener diode D2 and the transistor Q3 with the built-in resistor are arranged near the neon tube Ne. This leads to prevention of malfunction due to noise and stabilization of oscillation stop operation. The bypass capacitor C2 is connected to the oscillation transistor Q1 and the transistor Q1.
2 or near the Zener diode D2 and the transistor Q3 with a built-in resistor.

In this way, the present flash circuit forms a flash circuit for preventing battery consumption.

Next, the flash circuit of the present invention will be further described with reference to FIG.

The strobe circuit of the present invention includes a light emission prohibition switch SW1 which is a switch for disabling strobe light emission in a loop through which a discharge current of the xenon discharge tube Xe flows, and a strobe circuit for disabling charging of the main capacitor C1. It is provided with a charge prohibition switch SW2 that is a switch that disables light emission.

In the above description of the flash circuit, the light emission inhibition switch SW1 and the charge inhibition switch SW2
Has been described as being on, but in the strobe circuit of the present invention, both switches are used as follows.

First, the light emission inhibition switch SW1 is a push button switch that is always on, and is a switch that is turned off by the user pressing the push button when the strobe light is not emitted.

FIG. 6 is a view for explaining operation buttons provided on a film unit with a lens for turning on / off a strobe circuit of the present invention. A strobe switch button S for turning on a strobe switch SW of the strobe circuit is shown.
WB is provided on the entire surface of the film unit with the lens as shown in FIG.
By pressing B, the strobe switch S of the strobe circuit
W is configured to turn on, and the main capacitor C1 starts charging. Then, when charging is completed, the neon tube Ne of the strobe charging completion display hole lights up,
By pressing the release button, flash photography is performed.

When the flash photography is not performed, the release button is pressed while the light emission prohibition switch button SW1B on the side is pressed, so that the light emission prohibition switch button SW1B turns off the light emission prohibition switch SW1 of the flash circuit. As a result, the loop through which the discharge current of the xenon discharge tube Xe flows is broken, so that the photographing is performed without emitting the strobe light.

The strobe switch button SWB shown in FIG.
When holding the camera with both hands when shooting with a film unit with a lens, the middle finger of the left hand presses this button, and the light emission inhibition switch button SW1B is provided at a position convenient for the index finger to press. May be provided.

The position of the light emission prohibition switch SW1 may be set in a loop where the discharge current of the xenon discharge tube Xe flows or in a trigger circuit of the xenon discharge tube Xe. It is preferably provided at the location A in the drawing where no current flows or at B, C, D in the trigger circuit of the xenon discharge tube Xe.

Next, the charge prohibition switch SW2 is a slide switch which is turned on by sliding in one direction and turned off by sliding in the opposite direction. This is a switch for prohibiting charging of the main capacitor C1.

A film unit with a lens incorporating the strobe circuit of the present invention having such a charge prohibition switch SW2 is assembled on the assembly line with the charge prohibition switch SW2 turned off, and covered with an exterior body on the final assembly line. Immediately before, for example, the charge prohibition switch SW2 is slid to the ON state from a small hole formed in the front cover, and then the front cover is shipped with the small hole of the front cover covered with the exterior body. Thus, the operation of the charge inhibition switch SW2 from outside cannot be performed.

By providing such a charge prohibition switch SW2, even if an operator accidentally presses the strobe switch SW on the assembly line, the main capacitor C
1 is never charged. Therefore, there is no fear that the strobe emits light to cover the film.

The position of the charge prohibition switch SW2 is determined by a position where a charging current flows, for example, at positions E, F, and G shown in FIG.
It may be.

Next, as shown in FIG. 7, the oscillation transformer oscillates and charges the battery only when the strobe charge start switch is turned on. When the charge start switch is on, the oscillation transformer always oscillates and charging is continued. In a film unit with a lens provided with such a strobe circuit, a film unit with a lens using a grip switch as a strobe switch capable of preventing wasteful consumption of a battery as described above is shown.

FIG. 7 is a view showing a modification of the position where the grip switch button is provided in the film unit with lens having the strobe switch of the grip switch.
(A) is a view in which a grip switch button is provided below a strobe light emission window, (b) is a view in which a grip switch button is provided in the middle of a right grip portion of a film unit with a lens, (c) ) Is a diagram in which a grip switch button is provided above the right grip portion of the film unit with a lens, and (d) is a diagram in which a grip switch button is provided below the right grip portion of the film unit with a lens. is there.

In FIG. 7, the grip switch is a push button switch, and when the user grips, for example, the grip portion of the film unit with the lens, the finger presses the grip switch button GB to turn on the strobe switch. Therefore, when the user releases the lens-equipped film unit, the strobe switch is turned off naturally, and wasteful consumption of the battery due to forgetting to turn off the strobe switch can be prevented.

In (a), when the user holds the film unit with the lens, the index finger or the middle finger of the left hand pushes the grip switch button GB to turn on the strobe switch. In (b), when the user holds the film unit with the lens, the middle finger pushes the grip switch button GB on the right grip portion to turn on the strobe switch. In (c), the forefinger presses the grip switch button GB on the right grip, and the strobe switch is turned on. (D) The middle finger presses the grip switch button GB on the right grip,
The strobe switch will be turned on. In any case, if the film unit with the lens is released, the strobe switch is turned off naturally.

Next, the solder used when mounting the various electronic components and contacts of the above-mentioned strobe circuit on the circuit board is as follows:
A description will be given of an invention of mounting using harmful lead-free solder.

The lead-free solder is made of Ag instead of lead.
S using (silver), Zn (zinc), Bi (bismuth)
An n-Ag system, a Sn-Zn system, and a Sn-Bi system are preferred.
In particular, Sn-Ag type and Sn-Zn type have a melting point of at least 1.
It is preferable because the temperature is higher than 88 ° C., the mechanical strength is high, and the circuit board of the strobe can be reused.
That is, in addition to various electronic components, the strobe circuit board is a battery contact piece, a strobe switch as a main switch, a leaf switch for turning on a trigger circuit for emitting a strobe, a terminal of a xenon discharge tube for attaching a xenon discharge tube to the circuit board, and the like. There are many soldering spots that require strength. In many cases, the film unit with the lens is violently treated due to the nature thereof, and an impact is likely to be applied to a soldered portion. Therefore, mechanical strength of soldering is required. Furthermore, the strobe circuit is highly likely to be reused in terms of cost,
From this aspect, the mechanical strength of soldering is also required.

Therefore, it is preferable that Sn-Ag-based or Sn-Zn-based solder having a higher melting point and higher mechanical strength than lead-containing solder is used for mounting a strobe circuit board of a film unit with a lens. Furthermore, a circuit board mounted using solder that does not contain harmful lead does not adversely affect the environment when it is disposed of.

By using such a solder, a film unit with a lens free of environmental pollution by lead is provided to the user.

[0053]

According to the present invention, it is possible to arbitrarily charge the main capacitor of the strobe circuit without using the strobe light when the strobe shooting is not performed.
There is provided a lens-equipped film unit having a strobe circuit board using a lead-free solder which does not emit light and prevents a film fogging on an assembly line and which is free of environmental pollution.

[Brief description of the drawings]

FIG. 1 is a front view showing an outline of a film unit with a lens.

FIG. 2 is a cross-sectional view showing an internal configuration of a film unit with a lens.

FIG. 3 is an exploded perspective view showing an outline of a film unit with a lens.

FIG. 4 is a perspective view of an exterior body that covers the film unit with a lens.

FIG. 5 is a circuit diagram of a strobe light for explaining the present invention.

FIG. 6 is a diagram for explaining an operation button for turning on / off a switch of the strobe circuit of the present invention.

FIG. 7 is a diagram showing a modification of the position where the grip switch button of the strobe switch of the grip switch is provided.

[Explanation of symbols]

 BT, E5 Battery C1, E4 Main capacitor GB Grip switch button SW Strobe switch SWB Strobe switch button SW1 Emission inhibition switch SW1B Emission inhibition switch button SW2 Charge inhibition switch Xe Xenon discharge tube

Claims (10)

[Claims] 1. A main capacitor for emitting a strobe light is started by turning on a charge start switch of a strobe circuit, and the charging state is continued even after the switch is turned off, and the voltage of the main capacitor causes the strobe to emit light. In a film unit with a lens having a strobe circuit for stopping the charging when the voltage becomes possible and synchronizing with the shutter opening / closing operation, a switch for disabling the strobe light is provided in the strobe circuit. A film unit with a lens. 2. A switch for disabling strobe light emission is a light emission prohibition switch, wherein said light emission prohibition switch is provided in a loop through which a discharge current of a xenon discharge tube flows or a trigger circuit of the xenon discharge tube. Claim 1
The film unit with a lens according to 1. 3. The strobe circuit is a strobe circuit in which charging is automatically started after the strobe light is emitted. The switch for disabling the strobe light is a charge inhibition switch for inhibiting the charging of the main capacitor. The film unit with a lens according to claim 1, wherein the film unit has a lens. 4. The film unit with a lens according to claim 3, wherein the charge prohibition switch is a switch that cannot be operated externally. 5. A film unit with a lens, comprising a circuit mounted by using lead-free solder. 6. The film unit with a lens according to claim 5, wherein the circuit is a strobe circuit board. 7. The lens-fitted film unit according to claim 5, wherein the solder has a melting point of at least 188 ° C. or higher. 8. The film unit with a lens according to claim 5, wherein the solder is a Sn—Ag-based solder. 9. The film unit with a lens according to claim 5, wherein the solder is based on Sn—Zn. 10. The film unit with a lens according to claim 5, wherein the solder is a Sn—Bi-based solder.