JP2002148764A - Lens-fitted photo film unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform exposure control only by the pressing operation of a release button. SOLUTION: A light control circuit and a diaphragm control circuit are provided on the circuit board 50 of a stroboscopic device 17. At the time of photographing with strobe light, a metallic armature 54 is turned on by operating to slide a stroboscope charging button 8. By operating the release button 11, shutter release action is performed. At the time of releasing a shutter, the luminance of a subject is measured by a CdS 10, and whether or not a diaphragm is switched is selected by a diaphragm control circuit. Strobe light emission is performed with the kicking of a shutter blade by a shutter lever, and reflected light being the strobe light is received by a phototransistor 75. The quantity of emitted strobe light is controlled by the light control circuit.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, exposure control of a film unit with a lens.

[0002]

2. Description of the Related Art Conventionally, an exposure control used in a camera includes an external light control method in which the amount of external light is controlled by an aperture mechanism built in the camera, and a strobe light control method in which the amount of light emitted by the camera itself is controlled. Is mentioned. As the external light control method, a method using a selenium photocell without using a power battery, a method using a power battery and CdS, a method using a power battery and SP
There is a method using a D (silicon photodiode), a GPD (gallium-arsenic-phosphorous photodiode), and a signal amplification amplifier. The exposure amount is detected by using these methods, and the aperture is automatically controlled.

For automatic control of the aperture, an ammeter, a motor, an electromagnet and the like are used alone or in combination. In the flash light control method, a well-known light control circuit is incorporated in a flash device, and the amount of light emitted from the subject can be controlled by detecting reflected light from a subject when the flash is emitted. For example, when the external light control system is used, in a dark environment such as at night, the aperture is opened so that the background other than the subject is not blackened. In the case of using the flash light control method, the flash light is controlled so that the subject image does not fly white in close-up shooting.

[0004]

However, when shooting is performed in a dark environment using a strobe light control method, the strobe light emits full light, but when the subject image is separated by a predetermined distance or more, the amount of light in the subject image decreases. In some cases, resulting in an underexposed photograph. Conversely, when taking a picture in a bright environment, the strobe light is not emitted, but when the light quantity exceeds a predetermined light quantity, the light quantity of the subject image increases,
The photograph is overexposed.

In the case of using the external light control method, when photographing is performed in a dark environment, the aperture becomes large and the structure is such that much light is taken in. In this state, if an image is taken using a strobe device in a short-range shooting, an overexposed photograph is obtained. Also,
When taking a picture in a bright environment, for example, in a backlight state, the aperture becomes a small aperture. In this case, if no strobe light is emitted, the amount of light in the subject image itself is reduced, resulting in a photo with underexposure. In this state, if the amount of strobe light is large, an overexposed photograph is obtained.

In the case of a film unit with a lens having an aperture switching mechanism, the aperture is switched in conjunction with a strobe charging switch, and the aperture is switched to a large aperture when flash photography is performed. Overexposure may occur. In addition, there is a case where the strobe is not used even when performing nighttime photographing, but in this case, conversely, the light amount becomes insufficient. To solve these problems,
It is necessary to provide an external operation member and operate according to the shooting conditions.However, providing such a new operation member in a film unit with a lens that can be easily taken by anyone can complicate the shooting operation itself. Not only to make things
The cost of the film unit with lens provided at a low price is increased.

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above problems, and has as its object to provide a lens-fitted film unit in which the exposure amount can be controlled only by pressing a release button.

[0008]

In order to achieve the above object, a film unit with a lens according to the present invention is provided on a diaphragm plate by turning on and off a solenoid by photometry of subject brightness performed in conjunction with a shutter release operation. The presence or absence of an operation is determined by an automatic aperture switching device that positions one of the aperture stops having two different diameters on the optical axis, and an operation member provided outside. And a light control strobe device that emits strobe light in conjunction with opening and closing of the shutter blades at the time, receives the reflected light, and controls the amount of emitted strobe light.

[0009]

FIG. 1 is a perspective view showing the external appearance of the front of a lens-fitted film unit embodying the present invention. On the front surface of the unit main body 3, a photographing lens 5, an object-side finder window 6, a strobe light emitting unit 7, a strobe charge switch 8, a light receiving window 9 for a light receiving element, a CdS 10, and the like are provided. On the upper surface of the unit body 3, a release button 11, a counter window 12 for displaying the number of remaining photographable frames, and a light guide 13 for strobe charging display are formed. Further, on the back side of the unit main body 2, a winding knob 14 and an eyepiece side finder window which are rotated each time one frame is shot are exposed.

As shown in FIG. 2, the unit main body 3 includes a main body base 19 into which the exposure device 16 and the strobe device 17 are incorporated, a front cover 20 and a rear cover 21. The front cover 20 has an opening for exposing the photographing lens 5, the strobe light emitting unit 7, the strobe charging switch 8, and the like. The front cover 20 is assembled so as to cover from the front of the main body base 19 to which each unit component is attached.

The rear cover 21 covers the back of the main body base 19, and forms a film passage from the film roll chamber 23 through the back of the aperture to the cartridge chamber 22 with the main body base 19. The photographic film 24 passes through the film passage from the film roll chamber 23 to the film cartridge 2 loaded into the cartridge chamber 22.
5 In addition, bottom covers 21a and 21b are formed at the bottom of the rear cover 21, and these bottom covers 2a and 2b are formed.
The bottoms of the cartridge chamber 22 and the film roll chamber 23 are light-tightly closed by 1a and 21b. The bottom cover 21a of the cartridge chamber 22 is openable and closable, and the film cartridge 2 containing all the photographed films 24 already photographed.
Also serves as a take-out lid when taking out 5.

A cartridge chamber 22 and a film roll chamber 23 are integrally formed on the left and right sides of the main body base 19, and an exposure device 16 is provided between them. A strobe device 17 is attached between the exposure device 16 and the film roll chamber 23 by nail coupling. Cartridge chamber 2
2 and the film roll chamber 23 are loaded with a film cartridge 25 and a film roll 24a which is a roll of the photographic film 24. A winding knob 14 is rotatably disposed above the cartridge chamber 22, and a shaft member provided integrally therewith is engaged with a spool of a film cartridge 25 stored in the film cartridge 22. By rotating the winding knob 14 in the counterclockwise direction in the drawing, the photographed photo film 24 is wound inside the film cartridge 25.

The exposure device 16 is formed substantially at the center of the main body base 19. The exposure device 16 is a unit in which a shutter mechanism, a film stopping mechanism, a counter mechanism for displaying the number of remaining photographable frames, a finder, and the like are assembled in the dark box 30. As shown in FIG. 3, an exposure opening 30a is provided in the center of the front surface of the dark box 30.
On the front surface of the dark box 30, a shutter blade 31 and a lens holder 32 are attached in this order.

The shutter blade 31 is composed of one sector blade, and is rotatably attached to a pin 33 formed in the dark box 30. Shutter blade 31
The blade 31a is moved by the urging of the spring 34
0a is held in a closed position. At the time of photographing, the tip of the mounting portion 31b is kicked off by a shutter lever (described later) that operates in conjunction with the pressing of the release button 11, and rotates to an open position (clockwise in the drawing) that opens the photographing opening 30a. Then, the shutter blades 3 are biased by the springs 34.
1 returns to the closed position, the shutter opening 30a is opened during the rotation of the shutter blade 31, and exposure is performed. A pressing piece 31c is formed on the shutter blade 31. When the shutter blade 31 reaches a fully open position where the shutter opening 30a is fully opened, the pressing piece 31c turns on the synchro switch 53.

The lens holder 32 holds the taking lens 5 inside the lens barrel 32a, and has an opening 35 behind it.
Are formed. The taking lens 5 includes a first lens 36,
The second lens 37 is composed of two lenses, and an aperture plate 40 is disposed between them. As the first lens 36, a meniscus lens having a convex surface on the object side is used, and as the second lens 37, a biconvex lens is used. In addition, lens barrel 3
A lens cover 38 is attached to the front of 2a. The lens cover 38 holds down the outer peripheral portion of the first lens 36, and the photographing lens 5 is sandwiched and held between the lens holder 32 and the lens cover 38. The lens barrel 32a is provided with notches 32b and 32c, and the aperture plate 4 is provided through the notches 32b and 32c.
A part of 0 is held in the lens barrel 32a.

The aperture plate 40 is formed in a substantially L shape.
A small stop aperture 41 having a small diameter and a large stop aperture 42 having a large diameter are formed at the tip. This diaphragm plate 40
Is located between the first lens 36 and the second lens 37. When the shutter is charged, the large aperture 42 is positioned on the photographing optical axis. The aperture plate 40 is urged by a spring 43 in a counterclockwise direction around the rotation axis of the aperture lever 45 in the drawing.

The aperture lever 45 is provided with a mounting portion 45b and a pressing portion 45c on a shaft member 45a. The aperture lever 45 is rotatably attached to a pin 46 formed on the main body base 19. The aperture plate 40 is fixed to the mounting portion 45b, and the iron piece 47 is mounted to the pressing portion 45c. The aperture lever 45 abuts a latch solenoid 48 described later when the shutter is charged, and is held so that the large aperture 42 of the aperture plate 40 is positioned on the optical axis.

The latch solenoid 48 includes an iron core 48a,
A coil (not shown) wound around the iron core 48a is formed. The latch solenoid 48 is of a type that generates a magnetic force by energizing a coil. Further, the latch solenoid 48 is connected to a diaphragm control circuit 57 described later, and after the photometry by the CdS 10, the energization of the coil is selectively performed.

As shown in FIG. 2, the strobe device 17 is
A strobe light emitting unit 7 and a main capacitor 5 are mounted on a circuit board 50.
1, a battery 52, a synchro switch 53 and the like are assembled into a unit. When the strobe charging switch 8 is slid upward, the metal contact piece 54 provided on the circuit board 50 is turned on, and charging of the main capacitor 51 is started. In this strobe device 17, the synchro switch 53 is short-circuited by the pressing piece 31c of the shutter blade 31 that is movable when the shutter mechanism is operated, and emits strobe light.

As shown in FIGS. 4 and 5, the circuit arranged on the circuit board 50 includes a strobe circuit 55, a dimming circuit 56, an aperture control circuit 57, a main capacitor 51, a strobe discharge tube 58, and a battery 52. You. The strobe circuit 55 includes an oscillation transformer 60, an oscillation transistor 61, and the like. The oscillating transformer 60 and the oscillating transistor 61 constitute a known blocking circuit, and convert a voltage into a high voltage of about 300V. Note that reference numerals 59a and 59b are connection points.

The oscillation transformer 60 includes a primary coil 60a, a secondary coil 60b, and a tertiary coil 60c, each of which is inductively coupled. One end of the primary coil 60 a is connected to the positive electrode of the battery 52, and the other end is connected to the collector terminal of the oscillation transistor 61. Secondary coil 60b
Is connected to the anode of the rectifying diode 62,
The other end is connected to the positive electrode of the battery 52 together with one end of the tertiary coil 60c. The other end of the tertiary coil 60c is connected to the metal contact piece 54 through the resistor 63.

The cathode of the rectifier diode 62 is connected via a resistor 65 to one end of a trigger capacitor 66 and one end (plus side) of a main capacitor 51. The other end of the trigger capacitor 66 is connected to the metal contact piece 54. The emitter terminal of the oscillation transistor 61 is connected to the battery 5
The base terminal is connected to the metal contact piece 54 via the resistor 64.

The trigger capacitor 66 is charged with an output current from the oscillation transformer 60, similarly to the main capacitor 51. The synchro switch 53 is provided for the shutter blade 31.
It is turned on and off in synchronization with the opening and closing of. When the shutter blade 31 is fully opened and the synchro switch 53 is turned on, the charged trigger capacitor 66 causes a discharge current to flow through the primary coil 67 a of the trigger coil 67. Primary coil 67a
When a discharge current flows through the strobe discharge tube 5 via the trigger electrode 68, a trigger voltage is generated in the secondary coil 67b.
8. Thus, the flash emission is started at the moment when the shutter blade 31 is fully opened.

Reference numeral 70 denotes the display light guide 1.
3, an anode and a cathode are connected to both terminals of the tertiary coil 60c. When the charging voltage of the main capacitor 51 reaches the specified charging voltage, the voltage between both terminals of the tertiary coil 60c exceeds a predetermined value, and the light emitting diode 70 turns on.

Each electrode of the strobe discharge tube 58 is directly connected between the terminals of the main capacitor 51. The strobe discharge tube 58 is disposed inside the strobe light emitting unit 7, and when a trigger voltage is applied to the trigger electrode 68, the insulation between the electrodes is broken, and the electric charge of the main capacitor 51 is discharged between the electrodes. Emits light.

The dimming circuit 56 is configured to be connected to the main capacitor 51 in parallel with the slobo discharge tube 58 and to both terminals of the main capacitor 51. The capacitor 72, the resistor 73, and the zener diode 74 constitute an operating voltage generation circuit. The capacitor 72 is charged by the output current (300 V) of the oscillation transformer 60 when the main capacitor 51 is charged, and is saturated (400 V,
0.022 μF), charging stops. When the main capacitor 51 starts discharging through the strobe discharge tube 58,
The capacitor 72 discharges through the strobe discharge tube 58, the zener diode 74, and the resistor 73.

Phototransistor 75, capacitor 76
Thus, a light receiving portion is formed. Phototransistor 7
5 has its collector terminal connected to the cathode of the Zener diode 74 via a resistor 77. The emitter terminal of the phototransistor 75 and the Zener diode 7
The resistors 78 and 79 and the capacitor 76 are connected in series between the anode 5 and the anode 5.

The phototransistor 75 is arranged at a position facing the light receiving window 9 on the front surface of the unit main body 3, and flows a photoelectric current corresponding to the intensity of the light received from the subject. The capacitor 76 is charged by the photoelectric current from the phototransistor 75, and the charging voltage increases. That is,
The capacitor 76 converts the amount of reflected light from the subject received by the phototransistor 75 into a voltage. Note that a photodiode or the like may be used instead of the phototransistor 75.

The switching unit 80 comprises transistors 81 and 82. The base terminal of the transistor 81 and the collector terminal of the transistor 82
8 and a connection point of the resistor 79. The collector terminal of the transistor 81 is connected to the base terminal of the transistor 82, and the emitter terminal of the transistor 81 is connected to the anode of the Zener diode 74. The emitter terminal of the transistor 82 is connected to the cathode of the Zener diode 74 via the resistor 77.

When the charging voltage of the capacitor 76 reaches a predetermined voltage, the switching unit 80 turns on the transistor 81 and the transistor 82, respectively.
The switching unit 80 itself is turned on. In this example, turning on of the switching unit 80 is a light emission stop signal.

The capacitor 84 and the resistor 85 constitute an on-voltage generation circuit. One end of the capacitor 84 is connected to the anode of the Zener diode 74, and one end of the resistor 85 is connected to the cathode of the Zener diode 74.
The capacitor 84 is charged via a resistor 85 by a voltage generated across the Zener diode 74. When the switching unit 80 is turned on, the capacitor 84 discharges through the resistor 85, the resistor 77, and the switching unit 80. At this time, a gate voltage for turning on the thyristor 86 is generated between the terminals of the resistor 85. I do.

The thyristor 86 has a gate and a cathode connected to both ends of the resistor 85, and an anode and a cathode connected to both ends of the main capacitor 51. That is, the charging voltage of the main capacitor 51 is applied between the anode and the cathode of the thyristor 86, and the voltage between the terminals of the resistor 85 generated when the capacitor 84 is discharged is applied between the gate and the cathode. Reference numeral 87 denotes a coil.

As shown in FIG. 5, the aperture control circuit 57
A photometric unit including CdS 10, a resistor 88, a diode 89, and transistors 90 and 91; an aperture switching unit including a transistor 92, a transistor 93, a transistor 94, and a solenoid 48;
97, and a charging stop unit. The aperture control circuit 57 is connected to the flash circuit 55 via connection points 59a and 59b.

One end of the CdS 10 is connected to the negative electrode side of the battery 52, and the other end is connected to the base terminal of the transistor 92. One end of the resistor 88 is connected in series with a variable resistor 98, and the other end is connected to the base terminal of the transistor 91. The transistors 90 and 91 have the same characteristics of a PNP type, and their emitter terminals are common terminals. The collector terminal of the transistor 90 is connected to the base terminal of the transistor 91, and the collector terminal of the transistor 91 is connected to the base terminal of the transistor 90.

The variable resistor 98 is provided for adjusting the brightness of the subject as a reference for switching the aperture. When the film unit 2 with the lens is manufactured, the resistance value of the CdS 10 when the light of the reference luminance is irradiated on the CdS 10 is measured, and the sum of the resistance values of the resistor 88 and the variable resistor 98 is CdS 1
The resistance value of the variable resistor 98 is adjusted so as to be equal to zero.

When the subject brightness is smaller than the reference brightness,
Since the resistance value of CdS10 is larger than the sum of the resistance 88 and the variable resistance 98, the base current flowing through the transistor 90 decreases, and the emitter-collector voltage of the transistor 90 increases. Therefore, the voltage between the emitter and the base of the transistor 91 also increases, so that the base current of the transistor 91 increases. Then, the emitter-collector voltage of the transistor 90 decreases, so that the base current of the transistor 90 further decreases. Thus, the transistor 91 is turned on and the transistor 90 is turned off. On the other hand, when the subject brightness is equal to or more than a certain value, C
Since the resistance value of dS10 becomes small, the transistor 90
, The base current flowing therethrough increases. Then, by the operation opposite to the above, the transistor 90 is turned on and the transistor 91 is turned off.

The collector terminal of the transistor 91 is connected to the resistor 9
9 is connected to the transistor 92. As described above, when a current flows between the emitter and collector terminals of the transistor 91, a base current flows to the transistor 92 and the transistor 92 is turned on. The transistor 9
When 2 is turned on, a base current flows from the battery 52 to the transistor 93, and the transistor 93 is turned on. Also,
Since the base current also flows through the transistor 94, the latch solenoid 48 is turned on, and the fixed iron core 48a is excited.

When the photometric switch 100 is turned on, the stop transistor 95 is turned on by the current discharged from the battery 52, short-circuiting the base and emitter terminals of the oscillation transistor 61, and stopping the oscillation transistor 61. . Thus, when the main capacitor 51 is charged to the specified charging voltage, the operation of the blocking oscillation circuit stops, and the charging of the main capacitor 51 stops.

The reason that the battery 52 is connected to the solenoid 48 is that the series resistance of the solenoid 48 is very small, and when the solenoid 48 is operated, the electric charge stored in the storage capacitor 101 disappears in a short time. That's why. Even in this case, unless the transistor 92 is turned on, the transistor 94 is not turned on.
8 also does not work. Therefore, useless consumption of the battery 52 can be suppressed.

As shown in FIG. 6, the shutter mechanism is installed above the exposure device 16. This shutter mechanism includes a stop lever 105, a shutter lever 106, a shutter lever holder 107, a delay lever 108, a charge lever 109, a cam 110, and a governor mechanism 111. The cam 110 is provided with a circular plate 112 and a semi-circular first cam 113 and a second circular cam 114 below the circular plate 112. The locking piece 10 of the winding stop lever 105 is
A notch 112a for locking 5a is formed. The first cam 113 has a shutter lever 10
No. 6 hook 106b abuts. The second cam 114 is the first
It is formed at a predetermined interval from the cam 113, and the second
A shoulder 107b of the shutter lever holder 107 and a shoulder 108d of the delay lever abut on the outer periphery of the cam 114. The cam 110 is provided with a boss 1 formed on the exposure device 16.
16 is arranged so that the lowermost end of the shaft portion 110a is engaged with the engagement hole 117a of the sprocket 117. That is, when the photographed photo film 24 is stored in the film cartridge 25, the sprocket 117 engages with the perforations formed on the photo film 24, rotates counterclockwise in the drawing, and rotates the cam 110.
Also rotates. At the same time, the counter plate for displaying the remaining number rotates.

The shutter lever 106 is rotatably attached to a pin 119 provided on the dark box 40. The shutter lever 106 includes a kick arm 106 a for kicking the tip of the shutter blade 31 and a first
It comprises a hook 106b which comes into contact with the cam 113, and a projection 106c which is locked by the shutter lever holder 107. A torsion spring 120 is provided above the shutter lever 106.
20, the shutter lever 106 is urged counterclockwise in the figure.

The shutter lever holder 107 is rotatably mounted on the upper part of the dark box 40. A U-shaped notch 107a is formed at one end of the shutter lever holder 107. Shoulder 10 near notch 107a
7b is pressed against the outer periphery of the second cam 114 of the cam 110, and rotates in the clockwise direction in FIG.
The other end of the shutter lever holder 107 is provided with a protrusion 106 of the shutter lever 106 set at the charging position.
The shutter lever 106 is held at the charging position by locking with the shutter lever c.

The charge lever 109 is formed in a substantially L shape, and has a pin 109a and a projection 109b formed on the lower surface thereof. A torsion spring 121 is attached to the charge lever 109 and is urged clockwise in FIG.
This pin 109a engages with a notch 107a formed in the shutter lever holder 107, and
Following the rotation of 07, it rotates counterclockwise in the figure. On the other hand, the locking projection 109b is the projection 1 of the delay lever 108.
08b and is held at the charge position. The charge lever 109 is provided with a substantially L-shaped pressing lever 122. The pressing lever 122 is formed from a metal member. The pressing lever 122 is the charge lever 10
9 and rotates together with the pressing portion 45 of the aperture lever 45.
abuts on c. Then, the user presses the stop lever 45 to set the large stop opening 42 of the movable stop plate 40 to the photographing optical axis.

The stop lever 105 is provided with a locking claw 105a,
Projection 105b, release part 105c, stop part 105d
, And is rotatably attached to a shaft 123 provided in the dark box 40. A torsion spring 124 is attached to the winding stop lever 105 and is urged clockwise in the drawing. The protrusion 105b of the winding stop lever 105 is disposed so as to abut the locking piece 108c of the delay lever 108. The locking claw 105a is a notch 11 of the cam 110.
2a is provided. Winding stop 105
When the release lever 106 rotates clockwise in the drawing, it engages with a groove formed on the outer periphery of the hoist knob 14 to lock the rotation of the hoist knob 14. Release part 1
When the release button 11 is pressed, 05c is pressed by a pressing piece 11a formed below the release button 11, and rotates counterclockwise in the figure.

The delay lever 108 is mounted on the upper part of the dark box 40 so as to be rotatable.
1 together with the delay mechanism. This delay lever 1
08 is formed with a gear 108a at one end.
8a is in mesh with the switch gear 127. An arc-shaped projection 108b is formed near the gear 108a, and this projection 108b engages with a projection 109b formed on the lower surface of the charge lever 109. A locking piece 108c is formed on the upper surface of the delay lever 108. The locking piece 108c locks with the projection 105b of the winding lever 105. In addition, the shoulder 105d is the cam 11
Abuts on the second cam 114 of No. 0. This delay lever 1
A torsion spring 125 is attached to 08 and is urged counterclockwise in the figure.

The governor mechanism 111 includes a switch gear 127
And an ankle 128, which are respectively arranged above the dark box 40. The rotation speed of the switch gear 127 is adjusted by the pallet fork 128. As described above, the switch gear 127 is engaged with the gear 108a of the delay lever 108, and follows the rotation of the delay lever 108. Therefore, the governor mechanism 111 operates as a speed adjusting mechanism for adjusting the rotation speed of the delay lever 108. As shown in FIG. 7, a fan-shaped rib 129 is formed below the switch gear 127, and the rib 129 contacts the photometric switch 100 by rotating the rib 129 to turn on the photometric switch 100. The governor mechanism 111 delays kicking of the shutter blades 31 by the shutter lever 106, during which time photometry by the CdS 10 is performed and switching of the aperture is reliably performed.

Next, the operation of the present embodiment will be described. The photographer performs shutter operation by rotating the winding knob. When the photo film 24 is wound up by the winding knob 14, the cam 110 rotates counterclockwise in the figure together with the sprocket 117 as shown in FIG. And
The shutter lever 10 is moved by the first cam 113 of the cam 110.
6 is pressed, and the shutter lever 106 is pressed.
Rotates clockwise in the figure to start shutter charging.

When the photographic film 24 is wound up, the cam 1
When 10 rotates, the second cam 114 presses the shoulder 107b of the shutter lever holder 107, and the shutter lever holder 107 rotates clockwise in the figure. Since the notch 107a of the shutter lever retainer 107 and the pin 109a of the charge lever 109 are engaged, the shutter lever retainer 1
With the rotation of 07, the charge lever 109 rotates counterclockwise. Then, the other end of the shutter lever holder 107 engages with the projection 106c of the shutter lever 106.

On the other hand, as shown in FIG. 10, the rotation of the charge lever 109 causes the pressing lever 122 provided on the charge lever 109 and the pressing piece 45 c of the aperture lever 45 to move.
And abut. Subsequently, when the charge lever 109 is rotated and the shutter charge is completed, as shown in FIG.
Is pressed to bring the iron piece 47 into contact with the iron core 48a of the latch solenoid 48. Since the position of the latch solenoid 48 is determined so that the aperture plate 45 is in the large aperture position, when the iron core 48a contacts the iron piece 47, the aperture plate 4
5 large stop apertures 42 are held on the optical axis.

With the rotation of the shutter lever holder 107,
The second cam 114 is a shoulder 108d of the delay lever 108.
Also press. Thus, the delay lever 108 starts rotating clockwise. Then, as shown in FIG. 9, when the delay lever 108 rotates a predetermined amount, the locking piece 108 c of the delay lever 108 and the protrusion 1
05b is released, and the winding stop lever 105 rotates a predetermined amount clockwise. When the winding of one frame of the photo film 24 is completed, the locking claw 105a
Is a notch 112a formed in the disc 112 of the cam 110
Get into it.

At the same time, the winding stop 105 d enters the groove 14 a formed on the outer peripheral portion of the winding knob 14, and prevents the rotation of the winding knob 14. The delay lever 10
8 tries to rotate in the counterclockwise direction by the bias of the spring 125, but its rotation is prevented by the locking between the projection 105b of the locking lever 105 and the locking piece 108c. On the other hand, the charge lever 109 is urged clockwise by a spring 121, but its rotation is prevented by the engagement between the arc-shaped projection 108b formed on the delay lever 108 and the projection 109b. As described above, shutter charge is performed. On the other hand, since the pressing lever 122 holds the aperture lever 45 at the large aperture position by the spring force, the aperture is not switched even if there is vibration in the charged state.

The photographer performs flash photography according to the photography conditions. In this case, the strobe charging switch 8 is slid to turn on the metal contact piece 54. When the metal contact piece 54 is turned on, current is discharged from the battery 52 toward the primary coil 60a of the oscillation transformer 60. When a current flows through the primary coil 60a, a high voltage is generated in the secondary coil 60b, and charging of the main capacitor 51 and the trigger capacitor 61 via the rectifying diode 62 is started. Secondary coil 6
When the voltage is amplified by 0b, the current flowing through the tertiary coil 60c increases, and the light emitting diode 70 emits light.
The photographer confirms the end of charging with the light guide 13 and shoots.

When the release button 11 is pressed while the shutter is charged, the pressing piece 11 a formed below the release button 11 presses the release portion 105 d of the stop lever 105. This causes the stop lever 105 to rotate clockwise in FIG. 9 against the bias of the spring 120. The locking piece 10 of the delay lever 108
8c and the projection 105b of the winding stop lever 105 are released. The delay lever 108 rotates counterclockwise by the bias of the spring 125. Due to this rotation, the switch gear 127 of the governor mechanism 111 rotates, and the rib 129 contacts the photometric switch 100, so that photometric measurement of the subject image by the CdS 10 is performed.

When the delay lever 108 rotates counterclockwise, the protrusion 108 b
Since the charge lever 109 deviates from the rotation trajectory 09b, the charge lever 109 rotates clockwise by the bias of the spring 121. Accordingly, the shutter lever presser 107 is driven to rotate counterclockwise. As a result, the engagement between the projection 106c of the shutter lever 106 and the other end of the shutter lever holder 107 is released, and the bias of the spring 120 causes the shutter lever 106 to rotate counterclockwise, thereby causing the kicking lever 10 to move.
The kicking of the shutter blade 31 by 6a is performed.

At this time, if the photometric value obtained by the CdS 10 is smaller than a predetermined value, the transistor 91 conducts, the transistors 92 to 94 of the aperture switching unit are turned on, and the latch solenoid 48 is turned on. Thus, the iron core 48a of the latch solenoid 48 is excited, and the diaphragm plate 4
Numeral 0 indicates that the large aperture 42 is held on the optical axis against the bias of the spring 43. On the other hand, when the photometric value obtained by the CdS 10 is large, the latch solenoid 48 is not turned on, so that the aperture plate 40 is rotated by the bias of the spring 43, and the small aperture 41 is located on the optical axis.

Then, the strobe discharge tube 58 emits light and irradiates the subject image. The reflected light of this strobe light is
The light is received by the phototransistor 75 and the capacitor 7
6 is charged. This charging time varies depending on the amount of light reflected from the subject image. When the charging of the capacitors 76 and 84 is completed, the discharging of the switching unit 80 is started by the capacitor 76, and the capacitor 84 is discharged at the same time. The thyristor 86 is turned on by the discharge of the capacitor 84. Discharge is performed from the main capacitor 51 to both the strobe discharge tube 58 and the thyristor 86. Since the resistance of the strobe discharge tube 58 is larger than the resistance of the thyristor 86, the main capacitor 5
The first discharge is performed through the coil 87 toward the thyristor 86. Thus, the flash emission ends. If shooting is not performed without firing the flash, Cd
Measurement of the subject brightness and switching of the aperture in S110 are performed. This makes it possible to prevent overexposure during short-range shooting, underexposure during backlighting, and insufficient light quantity in a dark environment, etc., simply by operating the strobe charging button and the release button.

[0057]

As described above, according to the film unit with the lens of the present invention, the luminance of the subject is measured by the photometric circuit at the time of photographing, and the reflected light from the subject image is received at the time of flash emission by receiving the light of the flash. Since the amount of emitted light is controlled, an optimal photograph can be taken regardless of the shooting conditions at the time of shooting, simply by operating the release button, without the photographer setting.

[Brief description of the drawings]

FIG. 1 is a perspective view showing the appearance of a film unit with a lens embodying the present invention.

FIG. 2 is an exploded perspective view showing a configuration of a film unit with a lens.

FIG. 3 is an exploded perspective view showing a configuration of an aperture switching mechanism.

FIG. 4 is a circuit diagram showing a configuration of a strobe circuit and a dimming circuit.

FIG. 5 is a circuit diagram showing a configuration of an aperture control circuit.

FIG. 6 is a perspective view showing an exploded configuration of a shutter mechanism.

FIG. 7 is an explanatory diagram of a shutter mechanism at a release position.

FIG. 8 is an explanatory diagram illustrating a state in which a shutter lever is rotated to a charge position.

FIG. 9 is an explanatory diagram of a shutter mechanism at a charging position.

FIG. 10 is an explanatory diagram of an aperture switching mechanism at the time of a small aperture.

FIG. 11 is an explanatory diagram of an aperture switching mechanism at the time of a large aperture.

[Explanation of symbols]

 2 Film unit with lens 8 Strobe charge button 10 CdS 40 Aperture plate 51 Main capacitor 55 Strobe circuit 56 Dimming circuit 57 Aperture control circuit 58 Strobe discharge tube 75 Phototransistor

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G03B 9/02 G03B 9/02 B 9/04 9/04 15/03 15/03 H J 15/05 15 / 05 17/02 17/02 17/04 17/04 F term (reference) 2H002 AB04 AB05 CC28 CD06 CD08 CD09 CD11 CD12 DB05 FB21 FB24 HA11 JA05 2H053 AA01 AA09 AB03 AB04 AD11 AD13 AD14 AD21 BA51 BA55 BA67 CA41 CA45 2H080 AA19 AA64 CC05 2H100 BB06 BB07 BB08 2H101 AA01

Claims (1)

[Claims] A solenoid is turned on / off by photometry of subject brightness performed in conjunction with a shutter release operation, and one of aperture stops formed in a diaphragm plate and having two different diameters is positioned at an optical axis. The presence or absence of operation is determined by an automatic aperture switching device to be operated, and an operation member provided outside. In operation, a strobe light is emitted in conjunction with opening and closing of a shutter blade at the time of the shutter release operation, and the reflected light is emitted. And a dimming strobe device that receives light and controls the amount of strobe light emitted, and a film unit with a lens.