JPH09113970A - Film unit with lens provided with built-in flash and diaphragm type switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize miniaturization by adding an automatic charge stop circuit to a stroboscope and efficiently arranging additional parts which are increased in space formed by the outer walls of a battery chamber and a roll film chamber and the inner wall of a front cover. SOLUTION: A photographing part 5, the roll film chamber 7 and the battery chamber 9 are disposed in order in the body 1 of the title unit coated with the front cover 2 and a back cover 3; and a printed circuit board 21 on which stroboscopic components are mounted is arranged in the space surrounded by the front parts of the part 5 and the chambers 7 and 9 and the inner wall of the front cover 2. Then, a trigger coil, an oscillation transistor and an oscillation transformer are housed in the 1st space 11 formed by the outer wall of the chamber 9, the outer wall 1b of the chamber 7 and the inner wall 2a of the front cover 2; and a transistor with a built-in resistance, a capacitor and a trigger capacitor, which are comparatively tall components, are housed in the 2nd space 12 formed by the outer wall 1b of the chamber 7, the outer wall 1a of the photographing part 5 and the inner wall 2a of the front cover 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film unit with a lens having a built-in automatic charge stop strobe and a diaphragm type switch.

[0002]

2. Description of the Related Art Conventionally, film units with a lens having a built-in strobe are commercially available from various companies. The strobe circuit requires a larger current than other electronic circuits, so if you leave the switch on for charging, the battery will be drained drastically and the recycling time will be unacceptably long or it will be built-in. Before the shooting of all frames of the film is completed, it becomes impossible to use the strobe. In the case of a film unit with a lens, the user cannot replace the battery, so that special consideration must be given to battery consumption.

For this reason, various companies have devised the main switch of the strobe, such that the fingertip always presses the operating member of the main switch during charging, or the operating member of the main switch is a slide member and slides during charging. A configuration is used in which the member is projected laterally, and it is possible to visually recognize that charging is being performed from the other five surfaces except for the side surface opposite to the side surface from which the slide member is projected.

[0004] However, the former has a trouble that the operating member must be constantly pressed during charging, and the latter has a problem that when the battery is stored in a bag or the like without noticing the state in which the slide member is protruded, the battery becomes exhausted. There is a problem of exhaustion.

[0005] In order to solve such a problem, a film unit with a lens employing an automatic charging stop strobe similar to a strobe used in a lens shutter camera has begun to be marketed.

Also, a diaphragm type switch suitable for a main switch of a strobe is commercially available. In this switch, a plurality of legs provided at the ends are preliminarily brought into contact with the first pattern of the printed circuit board and stretched. Then, by pressing the protruding central part, the central part is moved to the second part of the printed circuit board.
The pattern was touched with the pattern, and the entire switch was fixed with cellophane tape.

[0007]

When the automatic charge stop strobe described above is built in, a transistor, a capacitor, a diode and the like are added to the conventional strobe. Also, these additional parts are not very small. For this reason, in commercially available film units with a lens with a built-in automatic charging stop strobe, the film is exposed by the taking lens, and the outer wall of the photographing unit that forms the photographing screen and the roll film chamber where the film is wound in advance. A large space is formed between the outer wall and the inner wall of the front cover, and most strobe parts are mounted in this space, and a battery chamber is provided at a position between the space and the roll film to store the battery. ing. As a result, the size of the camera in the lateral direction is enlarged, which hinders its compactness. Also,
On the printed circuit board for mounting each strobe component,
Since a double-sided board having a large area is used, the cost is increased.

In view of the above problem, a film unit with a lens with a built-in strobe is proposed in which an automatic charging stop circuit is added to the strobe so as to efficiently dispose an increasing number of additional parts so as not to hinder miniaturization. This is the first object of the present invention.

Further, the diaphragm type switch described above is
Although it is suitable as a main switch of an automatic charging stop strobe, it is difficult to position it on the pattern of the printed circuit board. Therefore, it is a second object of the present invention to propose a diaphragm type switch that can be easily positioned on the pattern of the printed circuit board. It is an issue.

[0010]

[Means for Solving the Problems] The first problem is that the film is exposed by a taking lens to form an image-taking screen, and a roll film pre-wound or a film is taken up at every shooting. A roll film chamber for storing any of the cartridges and a battery chamber for storing the battery of the power supply for the strobe are arranged in order, and the subject side of the photographing unit, the roll film chamber and the battery chamber is covered by the front cover. A first cover formed by an outer wall of the battery chamber, an outer wall of the roll film chamber and an inner wall of the front cover.
And a second space formed by the outer wall of the roll film chamber, the outer wall of the photographing section, and the inner wall of the front cover, a film unit with a lens with a built-in strobe, in which mounted components for an automatic charging stop strobe are arranged. In the first space, at least an oscillating transformer and a second transistor for stopping charging by stopping operation of a first transistor for oscillating the oscillating transformer are arranged, and at least the second transistor is provided in the second space. This is solved by a film unit with a lens with a built-in strobe, characterized in that a third transistor for stopping the operation of the transistor is arranged and a neon tube is arranged above the second space.

The second problem is that the plurality of legs provided at the ends are brought into contact with the first pattern of the printed circuit board in advance,
In a diaphragm type switch that presses the central portion that is stretched and protrudes to bring the central portion into contact with the second pattern of the printed circuit board, the leg portion that diagonally opposes the hole formed in the printed circuit board. This is solved by a diaphragm type switch characterized by insertion.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a film unit with a lens with a built-in strobe according to the present invention will be described in detail with reference to FIGS.

First, a circuit diagram of an automatic charging stop strobe will be described with reference to FIG.

To enter the flash photography mode, the main switch MSW is turned on. The main switch MSW is a diaphragm switch, and is turned on by pressing an operation button (not shown). Main switch MS
When W is turned on, the base current is supplied to the transistor Q102 which is the second transistor through the resistor R101, and the collector current of the transistor Q102 is supplied as the base current to the oscillation transistor Q101 which is the first transistor. Therefore, the oscillation transistor Q101 Is O
N, the current flows through the primary coil of the oscillation transformer TRA. As a result, a large current according to the winding ratio flows through the secondary coil of the oscillation transformer TRA, and the diode D101
Main capacitor C101 by the current rectified by
Is charged. When the current of the secondary coil increases, the base current of the oscillating transistor Q101 also increases via the transistor Q102, the collector current further increases accordingly, and the oscillating transistor Q101 enters an oscillating state.
Oscillation is continued by the back electromotive force of the secondary coil. one time,
In the oscillation state, the oscillation of the oscillation transistor Q101 is continued even if the main switch MSW is turned off, and the main capacitor C101 is charged.

When the main capacitor C101 is charged and the voltage of the neon tube Ne reaches 260 to 270V, the neon tube Ne is turned on. Further, the main capacitor C101
As the charging of the resistor R103 increases, the voltage across the resistor R103 increases, and when it reaches a predetermined voltage, the Zener diode D10
A Zener current flows through 2 and a base current of the transistor Q103 with a built-in resistor, which is a third transistor, flows, the transistor Q103 with a built-in resistor is turned on, and the transistor Q102 is turned off. As a result, the oscillation transistor Q101 is also turned off and the oscillation is stopped, and the battery B, which is the power source,
Also cuts the current. Therefore, it is possible to prevent the battery voltage from being lowered due to forgetting to turn off the main switch as in a conventional strobe.

As described above, when the main switch is pushed once, the oscillation continues until the charging voltage becomes necessary for stroboscopic photography, and the oscillation is stopped when the voltage reaches a predetermined voltage, so that the circuit is an energy saving circuit.

When the oscillation of the oscillation transistor Q101 is stopped and the charge of the main capacitor C101 is discharged to lower the voltage, the voltage of the neon tube Ne also drops after 5 to 15 minutes and the neon tube Ne is turned off. When the neon tube Ne is turned off at the time of photographing, the main switch MSW may be turned on again.

When the camera is aimed at the subject and the shutter is released with the neon tube Ne lit, the trigger switch TSW is turned on by the shutter opening operation, the trigger capacitor C103 is discharged through the primary coil of the trigger coil TRI, and the trigger coil TRI is released. A high voltage is generated in the secondary coil, and the xenon tube Xe, which is a strobe arc tube, emits light. When the xenon tube Xe emits light, the base voltage of the oscillation transistor Q101 instantaneously flows due to the circuit voltage fluctuation due to the light emission current of the main capacitor C101,
Re-oscillate. That is, continuous light emission can be performed without turning on the main switch MSW.

The resistor R102 is a trigger capacitor C.
The capacitor C102 is a charging resistance to 103, and prevents accidental re-oscillation due to disturbance noise from a motor or relay near the camera other than the light emission current.

Further, in the above-mentioned arrangement of components in the board incorporating the strobe circuit, the oscillation transistor Q101 and the transistor Q102 are arranged near the oscillation transformer TRA, and the Zener diode D102 and the resistor built-in transistor Q103 are connected to the neon tube Ne. Arranging them in the vicinity helps prevent malfunction due to noise and stabilizes the oscillation stop operation. The bypass capacitor C102 may be near the oscillation transistor Q101 and the transistor Q102, or near the Zener diode D102 and the resistor built-in transistor Q103.

Next, a state in which the automatic charging stop strobe circuit described above is mounted and built in the lens-fitted film unit will be described with reference to FIGS. 2 to 5.

FIG. 2 is a cross-sectional view of the main part of the lens-equipped film unit to which the automatic charging stop strobe unit is attached.

Reference numeral 1 denotes a main body, which is equipped with various mechanisms (not shown) for performing photographing. The front of the main body 1 is covered with a front cover 2 and the rear is covered with a back cover 3 in a light-tight state. ing. Reference numeral L denotes a photographing lens, which forms an image of the subject light on the film F when the shutter 4 is opened and exposes the film. In the present application, the part where the image is captured in this way is referred to as the image capturing part 5.

In the film unit with lens,
The unexposed film F is wound on the spool 6 in advance in the manufacturing process, and is wound up one frame at a time in each photographing in the arrow direction. In this application, the portion where the film F is wound is referred to as the roll film chamber 7.

Next to the roll film chamber 7, there is provided a battery chamber 9 for accommodating the battery 8 which is the power source of the strobe.

As described above, the photographing section 5, the roll film chamber 7 and the battery chamber 9 are arranged in order, and the mounted strobe component is printed in the space surrounded by the front of these and the inner wall of the front cover 2. It is mounted and arranged on the substrate 21. Here, the space formed by the outer wall of the battery chamber 9, the outer wall 1b of the roll film chamber 7, and the inner wall 2a of the front cover 2 is referred to as a first space 11. Further, the outer wall 1b of the roll film chamber 7, the outer wall 1a of the photographing unit 5, and the inner wall 2a of the front cover 2 are provided.
The inverted triangular space formed by and is referred to as a second space 12.

As is apparent from FIG. 2, the space formed by the central portion of the arc of the outer wall 1b of the roll film chamber 7 and the inner wall 2a of the front cover 2 is narrow, except for the flat main switch which will be described later. Is difficult to implement. However, since there is sufficient space in the first space 11 and the second space 12, even if the automatic charging stop function is added by appropriately disposing each part of the strobe unit in both spaces,
There is no loss in miniaturization.

The roll film chamber 7 does not necessarily have to be a portion for winding the film in advance as described above, but may be a portion for storing a cartridge for winding the film at the time of winding.

Further, since the battery chamber does not need to be light-tight, the battery chamber may be cut out if necessary so that the electric parts can be further projected so as not to hit the battery.

FIG. 3 is a view of the strobe unit as seen from the side where the parts are mounted, FIG. 4 is a pattern diagram of the printed circuit board as seen from the side where the strobe unit is mounted for easy comparison with FIG. 3, and FIG. It is the figure which drew the pattern of the printed circuit board on the figure which mounted.

The strobe unit will be described with reference to the above figures.

With respect to the names of mounted parts, the same parts as those in the strobe circuit diagram of FIG. 1 are designated by the same reference numerals. Note that 22
Is a reflecting mirror viewed from the back side, and holds the xenon tube Xe. Reference numeral 23 is a negative contact piece of the battery 8 and 24 is a positive contact piece of the battery 8. Both contact pieces hold the battery. Printed circuit board 2
The main switch MSW located on the front cover 2 side at approximately the center of 1 is a switch having a diaphragm contact described later.

The first space 11 described with reference to FIG. 2 accommodates the trigger coil TRI, the oscillating transistor Q101, the transistor Q102, the oscillating transformer TRA and the like as relatively tall parts, and the second space 12 is accommodated therein. A transistor Q103 with a built-in resistor, a capacitor C102, and a trigger capacitor C103 are housed as relatively tall parts.

The neon tube Ne is housed in a position extending upward from the inverted triangular space which is the second space, the reflecting mirror 22 and the xenon tube Xe are housed in the upper part of the roll film chamber 7, and the main condenser C101. Is stored in the lower part of the photographing unit 5.

The parts added for the automatic charge stop strobe are a transistor Q102 and a capacitor C10.
2. A transistor Q103 with a built-in resistor and a Zener diode D102, among which a tall transistor Q1
By disposing 02 in the first space 11 and disposing the resistor built-in transistor Q103 in the second space 12, it is possible to dispose efficiently.

Further, since the neon tube Ne is easily visible near a finder (not shown), it is inevitably located in the lens-fitted film unit from the center, and the neon tube Ne is located above the second space 12. To do. In this case, arranging the transistor Q103 with a built-in resistor near the neon tube Ne leads to prevention of malfunction due to noise and stabilization of the oscillation stop operation. Further, the Zener diode D102 is preferably arranged near the neon tube Ne for the same reason, but the degree of freedom of arrangement is large because the shape is small.

The capacitor C102 may be arranged in either the first space 11 or the second space 12 due to the pattern design.

Further, in order to efficiently design the pattern of the printed board 21, it is desirable to dispose the oscillation transistor Q101 and the transistor Q102 between the trigger coil TRI and the oscillation transformer TRA in the first space. Moreover, it leads to prevention of malfunction due to noise and stabilization of oscillation stop operation.

If the transistor Q103 with a built-in resistor is forcedly arranged in the first space, the space between the components will be narrowed and it will be difficult to automatically insert the components during mounting.

Next, a method of mounting the trigger switch TSW will be described with reference to FIG. FIG. 6 is a view in which the trigger switch TSW is mounted on the printed board 21, and is a view seen from the side opposite to the views shown in FIGS. 3 and 5.

The trigger switch TSW comprises a base 31, which is made of an insulating resin, a movable contact piece 32, and a fixed contact piece 33. The movable contact piece 32 and the fixed contact piece 33 are outserted to the base body 31. When a shutter blade (not shown) is opened, the movable contact piece 32 is pressed by the drive portion or the shutter blade itself to contact the fixed contact piece 33. Base 3
1 is composed of a first base 31a and a second base 31b,
The first base 31a is mounted on the side of the printed board 21,
The second base 31b is mounted on the printed circuit board 21 from the back surface of FIG. Two protrusions 31c are provided on the second base 31b, and protrude from the holes 21a formed in the printed board 21 to position the trigger switch TSW. Further, the movable contact piece 32 and the fixed contact piece 33 have terminal portions 32a and 33a projecting upward from the plane of the drawing, and projecting from a hole 21b formed in the printed circuit board 21 to provide a view on the printed circuit board 21. Solder with patterns not shown. In this way, the trigger switch TSW is fixed to the printed board 21.

In this figure, in order to further improve the mounting accuracy of the trigger switch TSW on the printed board 21, the first base 31 of the trigger switch TSW is provided.
a side surface 31d of the printed circuit board 21 is cut away from the side portion 2
The side surface 31e of the 1c is brought into contact with the side portion 21d so as to prevent backlash.

Next, a diaphragm type switch suitable for the main switch and the like will be described with reference to FIGS. 7 to 9.

FIG. 7 is a diagram of a conventional diaphragm type switch. The diaphragm type switch 41 is flatly formed by punching out a phosphor bronze plate or the like, and has four leg portions 41a at four end portions. The central portion 41b is stretched and protrudes above the plane of the drawing. Diaphragm switch 4 in this state
1 The whole is fixed to a printed circuit board with cellophane tape.
Therefore, normally, the four leg portions 41a contact the first pattern 42 of the printed circuit board, but the central portion 41b does not contact the second pattern 43. Central part 4 in this state
When 1b is pressed, it contacts the second pattern 43,
The pattern 42 and the second pattern 43 are electrically connected.

However, in such a conventional diaphragm type switch, the first pattern 4 on the printed circuit board is used.
Since there is no positioning between the second pattern 43 and the second pattern 43, the central portion 41b may be positioned at a position displaced from the second pattern 43, resulting in insufficient contact.

FIG. 8 shows a diaphragm type switch of the present invention which solves the above problems.

Leg portion 51a of diaphragm type switch 51
Although there are two, the central portion 51b comes into contact with the pattern 53 when it comes into contact with the pattern 52 of the printed circuit board and is pressed, like the diaphragm type switch described above. However, the other two legs 51c that are diagonally opposed to each other
Of the hole 54 formed in the printed circuit board is slightly larger than the width of the tip of the leg portion 51c.
Since the tips of the leg portions 51c are inserted into the upper part, the diaphragm-type switch 51 is positioned, and the problem that the central portion 51b is displaced by the second pattern 53 and the contact is insufficient does not occur. Further, the entire diaphragm type switch 51 is fixed with cellophane tape as in the conventional case.

FIG. 9 shows the diaphragm type switch 51 of FIG.
It is a figure of the diaphragm type switch 61 of the modified form, and the leg part 61a extended a little is soldered to the pattern 62. The tips of the two leg portions 61c are bent downward in the plane of the drawing, and the tips of the leg portions 61c are inserted into the holes 64 formed in the printed circuit board slightly larger than the widths of the tips of the leg portions 61c to perform positioning. The points are the same as described above.
In this embodiment, the diaphragm type switch 61
Is soldered to the printed circuit board, so it is not necessary to fix it with cellophane tape. Further, in the diaphragm type switch shown in FIGS. 7 and 8, it is necessary to perform gold plating on the leg portion and the central portion which come into contact with the pattern, but in FIG. 9, only the central portion may be plated with gold. Inexpensive nickel plating is sufficient for the soldered parts.

[0049]

According to the film unit with a lens with a built-in strobe according to the present invention, even if an automatic charge stop circuit is added to the strobe, the transistor, which is an additional component, can be efficiently arranged. It does not hinder the downsizing of the overall size, and can prevent malfunction due to noise and perform stable oscillation stop operation.

According to the film unit with a lens with a built-in strobe according to claim 2, the pattern of the printed circuit board can be efficiently arranged and the trigger contact piece can be shortened to prevent the trigger from jumping, which causes an accidental light emission.

According to the film unit with a lens with a built-in strobe according to claim 3, the flat diaphragm type switch is arranged as a main switch in the central portion of the printed circuit board where there is no space and other electric parts cannot be mounted. In addition to good mounting, the component mounting surface of the printed circuit board is held in the roll film chamber when the diaphragm type switch is pressed, so that reliable switch operation can be performed.

According to the diaphragm type switch of the fourth aspect, the positioning with respect to the printed circuit board is accurately performed, and the problem of insufficient contact during operation does not occur.

According to the diaphragm type switch of the fifth aspect, the contact failure is eliminated, and it is not necessary to fix the diaphragm type switch with the cellophane tape.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of an automatic charging stop strobe.

FIG. 2 is a cross-sectional view of a main part of a film unit with a lens to which an automatic charging stop strobe unit is attached.

FIG. 3 is a view of the strobe unit as viewed from a side on which components are mounted.

FIG. 4 is a pattern diagram of a printed circuit board viewed from a mounting side for easy comparison with FIG.

FIG. 5 is a diagram in which a pattern of a printed circuit board is drawn on a diagram in which components are mounted on a strobe unit.

FIG. 6 is a diagram in which a trigger switch is mounted on a printed circuit board.

FIG. 7 is a diagram of a conventional diaphragm type switch.

FIG. 8 is a diagram of a diaphragm type switch of the present invention.

9 is a diagram of a diaphragm type switch in a modified form of FIG.

[Explanation of symbols]

 MSW Main switch Q101 Oscillation transistor Q102 Transistor Q103 Transistor with built-in resistor C102 Capacitor D102 Zener diode TRA Oscillation transformer TRI Trigger coil 2 Front cover 5 Photographing section 7 Roll film room 9 Battery room 11 First space 12 Second space 21 Printed circuit board 41 , 51, 61 Diaphragm type switch

Claims (5)

[Claims] 1. A photographing unit for exposing a film by a photographing lens to form a photographing screen, and a roll film chamber for accommodating either a roll film wound in advance or a patrone for winding the film for each photographing. , A battery chamber accommodating a battery for a strobe power source is sequentially arranged, and the subject side of the photographing unit, the roll film chamber and the battery chamber is covered with a front cover, the outer wall of the battery chamber, the roll The first space formed by the outer wall of the film chamber and the inner wall of the front cover, and the second space formed by the outer wall of the roll film chamber, the outer wall of the photographing unit and the inner wall of the front cover are automatically In a film unit with a lens with a built-in strobe, in which components for mounting a charge stop strobe are arranged, at least the oscillation transformer and the oscillation transformer are provided in the first space. A second transistor that stops the operation of the first transistor that oscillates the charge and stops charging, and a third transistor that stops the operation of at least the second transistor in the second space; A film unit with a lens having a built-in strobe, wherein a neon tube is arranged above the second space. 2. A trigger coil is arranged in the first space close to a strobe arc tube, and the first transistor and the second transistor are mounted between the oscillation transformer and the trigger coil. The film unit with a lens with a built-in strobe according to claim 1, wherein: 3. The film with a lens with a built-in strobe according to claim 1 or 2, wherein a diaphragm type switch is arranged as a main switch substantially at the center of the substrate on which the parts for the automatic charging stop strobe are mounted. unit. 4. The plurality of leg portions provided at the end portions are brought into contact with the first pattern of the printed circuit board in advance, and the stretched and protruded central portion is pressed to move the central portion to the first printed circuit board. 2. A diaphragm type switch which is brought into contact with a pattern of 2, wherein said leg portions which are diagonally opposed to each other are inserted into holes formed in a printed circuit board. 5. The diaphragm switch according to claim 4, wherein one leg that is not inserted into the printed circuit board is soldered to the first pattern.