JPH1164940A - Film unit with lens - Google Patents

Abstract

PROBLEM TO BE SOLVED: To use an operation member for inhibiting the emission of strobe light also as a stroboscope charging start operation member. SOLUTION: A stroboscopic circuit is provided with a charge starting switch for starting the charging of a main capacitor and a light emission inhibiting switch for inhibiting the electric discharge of a trigger capacitor 80. One of a pair of terminals constituting each switch becomes a common terminal. Terminals 69a and 69b constituting the charge starting switch and terminals 82a and 69b constituting the light emission inhibiting switch are exposedly provided in the front surface of a stroboscopic circuit board 50. A switching member 86 having three switching pieces 88b-88d for short-circuiting the respective terminals 69a, 69b and 82a, when the operation member 17 is operated to slide is held/fitted between these terminals 69a, 69b and 82a and the stroboscope charging start operation member 17 provided in a front cover.

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 an externally operated strobe light-inhibiting operation member.

[0002]

2. Description of the Related Art In order to make it easy for anyone to enjoy shooting, a film unit with a lens equipped with a strobe equipped with a simple exposure mechanism and a strobe circuit, and an unexposed photographic film and a cartridge previously loaded at the time of manufacture. Hereinafter, this is referred to as a “film unit”). In this film unit, a switch for starting flash charging at the time of flash shooting is provided externally. As the switch for starting charging, there is a switch using a slide switch in addition to a push button switch. In the case of a slide switch, the switch is operated between two positions, a charge start position and a charge stop position.

[0003] The strobe circuit of the film unit is composed of a boosting section and a charging light emitting section, and the charging start switch described above is provided in the boosting section. When the charge start switch is operated to the charge start position, power is supplied from the power supply battery for the strobe to the booster. The booster boosts the voltage of the power supply battery, and accumulates the boosted high voltage in the main capacitor and the trigger capacitor that constitute the charging light emitting unit. When the charging of the main capacitor is completed, the power supply to the booster is cut off. The charging light emitting unit monitors the charging voltage of the main capacitor,
When the specified charging voltage is reached, the charging of the main capacitor is stopped.

When the shutter is released, the shutter mechanism is operated, and the synchro switch is turned on in conjunction with the operation of the shutter mechanism. Synchro switch is ON
Then, the trigger capacitor is discharged, the discharge flows to the primary coil of the trigger transformer, and a high voltage is sent out from the secondary coil side of the trigger transformer. This high voltage is applied to the discharge tube as a trigger voltage. The discharge tube discharges by the electric charge stored in the main capacitor and emits a strobe light at the moment of application.

On the other hand, when taking a picture while prohibiting strobe light emission, the charging operation switch is slid toward the strobe charging stop position. As a result, since power from the power supply battery is not supplied to the booster, it is possible to perform shooting in which strobe light emission is prohibited.

However, depending on the timing at which the strobe charging switch is operated to the charging stop position, the main capacitor may be charged. In such a state, strobe light is emitted.

In order to solve such inconvenience, in the invention described in Japanese Patent Application No. 7-106051, a switch is provided on a circuit in which a trigger capacitor is discharged and a current flows through a primary coil of a trigger transformer. The operation member for strobe light emission prohibition provided in the above is linked to this switch.
Therefore, a strobe charging start operation member and a strobe light emission prohibition operation member are provided outside the film unit.

[0008]

By the way, since the above-mentioned film unit is provided with a charging start operation member and a strobe light emission prohibition operation member, an operation of turning on the charging start operation member firstly, Since it is necessary to perform the operation of selecting the flash emission by operating the light emission prohibiting operation member for each photographing, the operability is poor. In addition, even when the photographing is performed without the strobe light, the charging of the main capacitor is continued and the power battery is wasted because the operation member for starting the charging is ON.

SUMMARY OF THE INVENTION The object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide a film unit with a lens which is devised so that photographing can be performed while strobe light emission is surely inhibited.

[0010]

SUMMARY OF THE INVENTION In order to solve the above problems, according to the present invention, a charge start switch interlocked with the operation of an externally operable strobe charge start operation member and a charge start switch are provided. Power is supplied from a power supply battery through a closed circuit, and a booster that boosts the power, a main capacitor and a trigger capacitor that are charged with the high voltage boosted by the booster, and discharges the trigger capacitor in response to a shutter release. A synchro switch, a trigger transformer that sends out a high trigger voltage by discharging the trigger capacitor, and a trigger voltage are applied, and the strobe light is discharged by the charge accumulated in the main capacitor when the trigger voltage is applied. It is provided on the discharge circuit that emits light and the discharge circuit of the trigger capacitor, and is used for charging. Pitch is to open the discharge circuit of the trigger capacitor at open circuit, in which a Flash Off switch in conjunction with the operation of the flash charging start operation member.

According to the second aspect of the present invention, the charging start switch and the light emission prohibiting switch include three terminals each having one of a pair of terminals as a common terminal, and these three terminals. And three switch pieces for short-circuiting the terminals.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 2, a film unit 10 includes a photographing lens 13, a winding knob 14, a finder optical system 15, a strobe light emitting unit 16, a strobe charging start operating member 17, a print size changeover switch 18,
A number-of-photographs display window 19, a charge completion display window 20, a shutter button 21, and the like are provided in an exposed manner. On the left side of the front surface of the film unit, a grip portion 22 bulging in the front direction is formed. And the grip part 22
A bottom cover 23 that is opened when the cartridge containing the photographed photo film is taken out is disposed on the bottom surface of the camera.

A print size changeover switch 18 is provided on the outer periphery of the photographing lens 13 so as to be slidable along the periphery of the photographing lens, and selects three types of print sizes according to a subject to be photographed. By selecting these sizes, a field mask is inserted in front of the objective lens in the finder optical system in conjunction with this selection operation, and the finder field range has the same aspect ratio as the selected print size.

At the time of photographing, a mark indicating the type of the selected trimming range is imprinted outside the range of each photographed frame using external light. At the time of development, immediately before printing each photographed frame, a mark corresponding to each photographed frame is read, and a print photograph is created within a designated trimming range.

At the time of flash photography, the flash charging operation member 17 is slid. This operation member is ON
The slide operation is performed at two positions, a position and an OFF position. O
When operated to the N position, flash charging is started, and flash emission is always performed in conjunction with shutter release. In addition, by operating in this position, charging is automatically started until the next photographing, so that subsequent flash photographing can be performed instantaneously. On the other hand, when the switch is set to the OFF position, strobe charging is stopped and strobe light emission is prohibited during shooting.

The outer cover of the film unit 10 is shown in FIG.
As shown in FIG. 1, the front cover 25 and the rear cover 26 are provided. These covers 25 and 26 incorporate an exposure unit 27, a strobe unit 28, a photographic film cartridge 29, and a main body base 30 in a sandwich structure. These parts 25 to 30 are detachably attached to each other by nail coupling.

The exposure unit 27 includes a photographing lens 13, a shutter mechanism, a film unwinding mechanism, a film counter mechanism, a mechanism for imprinting a mark representing a print size,
And a unit component integrally incorporating the finder optical system 15 and the like. The front cover 25 has a built-in field mask switching mechanism on the inside, and exposure holes 31 and 32 for exposing the photographing lens 13 and the finder objective lens of the finder optical system 15 are provided on the front surface. . On the upper surface of the front cover 30, a shutter button 21 for operating a shutter mechanism is integrally provided.

As the photographic film cartridge 29 stored in the film unit 10, for example, a photographic film cartridge corresponding to the IX240 film cartridge is used. In addition, 1
A 35 type photographic film cartridge may be used. The photo film cartridge 29 contains the photo film 3
4 and a spool 3 around which the photo film 34 is wound.
5 and a cartridge 36 for rotatably storing the spool 35.

An aperture 37, which is an exposure opening, is formed in the center of the main body base 30, and a cartridge chamber 38 and a film roll chamber 39 are formed on both sides thereof. In the cartridge chamber 38 and the film roll chamber 39, a cartridge 36 and a film roll 34a obtained by rolling a photographic film 34 drawn from the cartridge 36 into a roll shape are stored. These rooms 3
8 and 39 are open at the bottom, and are light-tight by closing the bottom lids 23 and 40 of the rear cover 26. Further, a winding knob 14 is provided above the cartridge chamber 38. The wind-up knob 14 is engaged with a spool 35 and rotates the spool 35 in a film wind-up direction (the direction of the arrow shown in the figure) to constitute a film wind-up mechanism for winding a photographed photo film 34 into a cartridge 36. doing.

The rear cover 26 has a finder eyepiece window 4.
1 and a charge completion display window 20 are provided. Also,
At the upper end of the rear cover 26, an opening 42 for exposing a part of the periphery of the winding knob 14 to the outside is formed.

The strobe unit 28 includes a circuit board 50
The main component 51, the power supply battery 52, the synchro switch 53, the strobe light emitting section 16 and the like are integrally attached to form a unit component that constitutes a strobe circuit. The strobe unit 28 is attached to the film roll chamber 39 of the main body base 30 by positioning means, and is held by pawls.

FIG. 4 shows a strobe circuit built in the film unit 10. As shown in FIG. The strobe circuit is roughly divided into an imprint lamp lighting circuit 60, a booster 61, and a charging / light emitting unit 62. The imprint lamp lighting circuit 60 is a circuit that turns on the imprint LED 64 in conjunction with the synchro switch 63. The booster 61 includes a power supply battery 65 serving as a power supply source, an oscillation transistor 66, and an oscillation transformer 6.
7, charging diode 68, charging start switch 69,
Stop transistor 70 and charging completion display LED 7
9 and so on.

Oscillation transistor 66 and oscillation transformer 67
Constitutes a known blocking oscillation circuit. When the strobe charging start switch 69 is turned on, a base current flows into the oscillation transistor 66 and the oscillation transistor 66 starts operating. The oscillation transistor 66
When the operation is started, the oscillator oscillates by the positive feedback action from the oscillation transformer 67.

The secondary coil 72 includes an oscillation transistor 6
During the oscillation of 6, a high voltage electromotive force is generated according to the winding ratio between the primary coil 71 and the secondary coil 72. The charging diode 68 supplies only the secondary current flowing in one direction due to the electromotive force to the charging / light emitting unit 62.

The stop transistor 70 has a base terminal connected to the zener diode 75. The charging voltage of the main capacitor 51 is applied to the Zener diode 75, and a Zener current flows when the charging voltage reaches a specified charging voltage. When the Zener diode 75 does not flow the Zener current, the stop transistor 76 renders the emitter-collector non-conductive because the base current does not flow, but when the Zener diode 75 flows the Zener current. , A voltage higher than the operating voltage is applied between the emitter and the base, and a zener current flows as a base current. When the stop transistor 76 becomes like this, the base terminal and the emitter terminal of the oscillation transistor 66 become equipotential, and the oscillation of the oscillation transistor 66 is stopped. In addition, when the flash charging start switch 69 is ON,
When the charging voltage of the main capacitor 51 becomes equal to or lower than the specified charging voltage, the oscillation transistor 66 starts oscillating again. When the charging voltage of the main capacitor 51 reaches the specified charging voltage, the charging completion display LED 79 blinks, and the display window 20 is turned on via a light guide or the like provided in the exposure unit.
Will be displayed to the outside.

The charging / light-emitting unit 62 includes the main capacitor 5
1. It comprises a discharge tube 77, a trigger electrode 78, a trigger capacitor 80, a trigger transformer 81, a synchro switch 63, a light emission inhibiting switch 82, etc. provided inside the strobe light emitting section 16. The main capacitor 51 has both terminals connected to both electrodes of the discharge tube 77 and a negative terminal connected to the cathode of the charging diode 68.

The current (secondary current) supplied from the booster 62 charges the main capacitor 51 and the trigger capacitor 80. The synchro switch 63 is opened and closed in conjunction with the operation of the shutter, and is turned on when the shutter is fully opened. When the synchro switch 63 is turned on, the trigger capacitor 80 is discharged, and the discharged current flows through the primary coil 83 of the trigger transformer 81. As a result, a high trigger voltage is generated in the secondary coil 84. This trigger voltage is applied to the discharge tube 77 via the trigger electrode 78. By the application of the trigger voltage, the Xe gas inside the discharge tube 77 is ionized, the resistance between both electrodes of the discharge tube 77 is broken, the main capacitor 51 is discharged, and the discharge tube 77 emits light.

The light emission inhibition switch 82 includes a trigger capacitor 80, a primary coil 8 of a trigger transformer 81.
3 and a synchro switch 63 to open and close a discharge circuit 85 (loop shown by a thick line). This circuit 8
Reference numeral 5 is for discharging the trigger capacitor 80 in conjunction with the turning on of the synchro switch 63 and flowing this discharge current to the primary coil 83 of the transformer 81 for trigger. Therefore, by opening this circuit 85, the discharge of the trigger capacitor 80 is prohibited.

The light emission inhibition switch 82 is also arranged on a circuit for charging the main capacitor 51 and the trigger capacitor 80. Therefore, switch 8
When 2 is turned off, charging of the main capacitor 51 and the trigger capacitor 80 is also prohibited. Note that the charge start switch 69 and the light emission inhibition switch 82 have the minus terminal 69b as a common terminal.

As shown in FIG. 1, the charging start switch 69 and the light emission inhibiting switch 82 are connected to terminals 69a and 69, respectively.
b, 82a and a switch member 86 for opening and closing these terminals 69a, 69b, 82a. Terminal 69
Reference numerals a, 69b, and 82a are provided to be exposed on the front surface of the circuit board 50 of the strobe unit 28.

The switch member 86 is formed by bending a single conductive elastic plate, and includes a holding portion 87 having a U-shaped cross section, a switch portion 88, and a joint portion 89 connecting these. Have been. Holder 87
Is sandwiched between the front surface of the film roll chamber 39 and the back surface of the front cover 25. The switch section 88 includes three switch pieces 88b to 88d that are bent at a fixed angle from the top, bottom, and left sides of the rectangular vertical surface 88a toward the back.
Consists of The joint portion 89 has a shape bent at a predetermined angle so as to hold the switch portion 88 on the front side in the horizontal direction with respect to the holding portion 87. This allows
The tip of each of the switch pieces 88b to 88d is usually connected to the terminal 6
9a, 69b and 82a.

The flash charging start operating member 17 is slid in front of the switch section 88. A pressing portion 9 having a tapered surface 90a and a pressing surface 90b connected to the tapered surface 90a is provided on the back surface of the strobe charging start operation member 17.
0 is provided. The pressing surface 90b presses the vertical surface 88a of the switch unit 88 when the strobe charging start operation member 17 is operated to the ON position, and the switch pieces 88b to 88b.
88d is brought into contact with the terminals 69a, 69b, 82a. The tapered portion 90 a is for the pressing portion 90 to smoothly press the vertical surface 88 a of the switch portion 88.

As for the contact timing of the switch pieces 88b to 88d, it is necessary to secure the charging route of the main capacitor 51 first, and as the release timing, the main capacitor 5
1, the light emission prohibition switch 82 is turned on before the charge start switch 69, and the light emission prohibition switch 82 is turned on before the charge start switch 69.
The length of the switch pieces 88b and 88c that are in contact with the contacts 69b and 82a is longer than the length of the switch piece 88d so that the switch piece is turned off later. Therefore, switch piece 8
The ends of 8b and 88c are clearances approaching the terminals 69b and 82a, and the ends of the switch pieces 88b and 88c are terminals 6b and 88c.
The gap is more than the gap described above from 9a. Instead of changing the length of each of the switch pieces 88b to 88d, the gap described above may be changed by changing the bending angle of each of the switch pieces 88b to 88d.

Next, the operation of the above embodiment will be described. The photographer operates the winding knob 14 of the film unit 10.
When the film winding operation is performed by rotating the, the shutter film is wound and the shutter charge is performed. In the case of flash photography, the flash charging start operation member 17 is slid to the ON position.

In the process of operating the strobe charging start operating member 17 to the ON position, first, the vertical surface 88a of the switch portion 88 is gradually pressed on the tapered surface 90a, and when the ON position is reached, the pressing surface 90b is turned into the vertical surface 88a. Press. When the pressing surface 90b presses the vertical surface 88a, the switch pieces 88b and 88c are longer than the switch piece 88d.
a, 69b, and the switch piece 88d contacts the terminal 69a slightly later.

Therefore, the light emission inhibiting switch 82 is turned on first, and then the charging start switch 69 is turned on. When the charging start switch 69 is turned on, the oscillation transistor 66 starts operating, and the oscillation transistor 67 starts operating.
The oscillating operation is continuously performed by the blocking oscillation circuit composed of

The secondary current due to the high voltage electromotive force generated in the secondary coil 72 during the oscillating operation is supplied to the charging diode 6
Power is supplied to the charging / light-emitting unit 62 via the power supply 8, and the main condenser 51 and the trigger condenser 80 are charged here.

When the charging of the main capacitor 51 proceeds,
The voltage between the terminals of the main capacitor 51 increases. For this reason, the load on the secondary coil 72 is increased, so that the secondary current hardly flows, the voltage of the electromotive force and the back electromotive force of the secondary coil 72 decreases, and the oscillation frequency of the oscillation circuit increases. .

As a result, a reverse voltage is applied to the Zener diode 75. When the main capacitor 51 reaches the specified charging voltage, the Zener diode 75
, A Zener voltage flows, and a Zener current flows. Since this zener current flows as the base current of the stop transistor 76, the stop transistor 70 is turned on.
Becomes

When the stop transistor 70 is turned on, the base and the emitter of the oscillation transistor 66 are connected by the stop transistor 70 to have the same potential, and the oscillation transistor 66 is turned off. When the oscillation transistor 66 is turned off, no current flows through the primary coil 71 of the oscillation transformer 67, so that the charging of the main capacitor 51 is stopped.

When the main capacitor 51 is charged to the specified charging voltage, the charging completion display LED 79 blinks.
The photographer recognizes that strobe light emission is ready from this display, and after this recognition, performs framing and then presses down the shutter button 21.

The shutter operates in conjunction with the shutter release, and the synchro switch 63 is turned on at the moment when the shutter is fully opened. When the synchro switch 63 is turned on, the trigger capacitor 80 is discharged, and a current due to the discharge flows through the primary coil 83 of the trigger transformer 81 to generate a trigger voltage on the secondary coil 84. This trigger voltage is applied to the discharge tube 77 via the trigger electrode 78. As a result, the electric charge of the main capacitor 51 is discharged between both electrodes of the discharge tube 77, the discharge tube 77 emits light, and the strobe light is emitted from the strobe light emitting unit 16 toward the subject.

The light reflected from the subject passes through the taking lens 13 and is exposed to the photographic film 34 set in the aperture 37 to form a photographic frame. At the same time as the synchro switch 63 is turned on, the mark imprinting LED 64 is turned on for a certain period of time, and the mark indicating the print size selected at that time is imprinted outside the photographing frame range of the photo film 34.

After the photographing, if the strobe charging start operation member 17 is set to the ON position, charging starts automatically.

When taking a picture with strobe light emission prohibited, the strobe charge start member 17 is slid to the OFF position. In the process of operating the strobe charging start operating member 17 to the OFF position, first, the vertical surface 8
The engagement of the pressing portion 90 pressing the switch 8a changes from the pressing surface 90b to the tapered surface 90a, and the pressing of the switch 88 is gradually released. Then, the strobe charging start member 17
Reaches the OFF position, the pressing portion 90 comes out of the switch portion 88. At this time, the switch pieces 88b, 88c
Is longer than the switch piece 88d, the switch piece 88d separates from the terminal 69a first, and then the switch pieces 88b and 88c separate from the terminals 82a and 69b.

Therefore, the charging start switch 69 is turned off first, and then the light emission inhibition switch 82 is turned off.
I do. As a result, charging of the trigger capacitor 80 and the main capacitor 51 is stopped, and discharging of the trigger capacitor 80 is prohibited.

In such a state, even if the synchro switch 63 is turned on, since the discharge circuit 85 of the trigger capacitor 80 is open, the trigger voltage is applied to the discharge tube 77 even when the main capacitor 51 is charged. It is not applied.

The film unit 10 after completing the photographing for all the photographing frames is submitted to the developing laboratory. In the developing station, the bottom cover 23 is opened, the cartridge 36 taken out from the cartridge chamber 38 is taken out, and the developing and printing processes are carried out in the conventional manner.

In the above embodiment, the charging start switch 69
One of the pair of terminals of the switch 82 and the light emission prohibiting switch 82 is a common terminal, and a switch unit 88 having three switch pieces 88b to 88d contacting these three terminals is used. However, instead of using a common terminal, a switch unit having four terminals and four switch pieces may be used.

The switch 88 is pressed by the sliding operation of the strobe charging start operating member 17 to perform switching. However, the switch 88 is mounted behind the strobe charging start operating member 17 and the switch 88 is started to strobe charging. The switching may be performed by sliding along with the operation member 17.

[0051]

As described above, in the present invention, the switch for starting charging and the switch for inhibiting light emission are linked in conjunction with the operation of the strobe charging start operating member, so that the operation is simplified and the light emission for strobe light is inhibited. When the operation is performed, the charging of the main capacitor is automatically stopped. In another aspect of the invention, the charge start switch and the light emission prohibition switch include three terminals each having one of the pair of terminals as a common terminal, and three terminals for short-circuiting the three terminals. Since the switch is composed of the switch pieces, the cost is lower than providing two switches separately.

[Brief description of the drawings]

FIG. 1 is a perspective view of an essential part showing an internal structure of a strobe charging start operation member of the present invention.

FIG. 2 is a perspective view showing an appearance of a lens-fitted film unit having a built-in flash circuit.

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

FIG. 4 is a circuit diagram schematically showing a strobe circuit.

[Explanation of symbols]

 Reference Signs List 10 Film unit with lens 17 Strobe charge start operating member 28 Strobe unit 51 Main capacitor 66 Oscillation transistor 67 Oscillation transformer 69 Charge start switch 70 Stop transistor 77 Discharge tube 80 Trigger capacitor 81 Trigger transformer 82 Light emission inhibition switch

Claims (2)

[Claims] A power supply is supplied from a power supply battery through a charging start switch interlocked with the operation of an externally operable strobe charging start operation member, and the charging start switch is closed to boost the power supply. A booster unit, a main capacitor and a trigger capacitor that are charged with the high voltage boosted by the booster unit, a synchro switch that discharges the trigger capacitor in response to a shutter release, and a high-voltage trigger by discharging the trigger capacitor. A trigger transformer that sends out a voltage, a discharge tube that emits strobe light by applying the trigger voltage and discharges the electric charge accumulated in the main capacitor when the trigger voltage is applied, and discharge of the trigger capacitor. A trigger is provided when the charge start switch is open. A film unit with a lens, comprising: a light emission prohibition switch interlocked with the operation of the strobe charging start operation member so as to open the discharge circuit of the capacitor for use. 2. The switch for starting charging and the switch for inhibiting light emission include three terminals having one of a pair of terminals as a common terminal, and three switches for short-circuiting the three terminals. 2. The lens-fitted film unit according to claim 1, wherein the film unit comprises a piece.