JPH0538337Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a synchronization contact unit for obtaining a synchronization signal for causing a strobe to synchronously emit light.

[Conventional technology]

Most modern single-lens reflex cameras and compact cameras are equipped with a synchronization contact that eliminates a shutter synchronization signal for flash photography so that photography can be taken under low illumination conditions, such as indoors.
On the other hand, in the case of a lens-equipped film unit (hereinafter referred to as a film unit), which is provided at a very low price by incorporating a simple photographing mechanism into a container containing film, in order to reduce costs as much as possible, It is not equipped with a film exchange mechanism or an exposure control mechanism that changes the aperture and shutter speed, and is manufactured with limited shooting conditions such that it can only shoot within a certain brightness range, for example outdoors under clear skies. , no consideration was given to flash photography.

[Problem that the invention attempts to solve]

However, if you want to use the above film unit to take pictures under low illumination, for example indoors,
The illuminance differs by about 10 EV compared to outdoors under clear skies, and with a film unit that does not have an exposure adjustment mechanism to change the aperture or shutter speed, even if you use a high-sensitivity film with a wide latitude, for example, it will not work with a strobe or other light source. Without supplemental lighting, it is difficult to take satisfactory photographs.

[Purpose of invention]

The present invention was devised in view of the above-mentioned problems, and it is an object of the present invention to easily synchronize and emit strobes at a minimum cost in order to enable photography under low illumination even with the above-mentioned low-cost film unit. The purpose of this invention is to provide a synchro contact unit that enables

[Means for solving problems]

In order to achieve the above object, the synchronizing contact unit of the present invention is attached via a mounting member provided at the front of the main body base equipped with shutter blades for opening and closing the exposure aperture, and one end is attached to the front part of the main body base. A pair of elongated contact pieces installed in the movement path of the shutter blade and having the other end exposed to the mounting portion of the strobe device, and a support that holds the pair of contact pieces in a separated state and is attached to the mounting member. The contact piece is closed by being pressed by a shutter blade when the exposure aperture is fully opened.

[Effect]

According to the above mechanism, the pair of contact pieces, which are normally held apart by the support member, come into contact with each other by the shutter blade itself when the shutter blade is fully opened, and this signal is transmitted. The light is directly sent from the other end of the pair of contact pieces to the strobe device, and the X contact in the strobe device is short-circuited.

Embodiments of the present invention will be described below with reference to the drawings.

〔Example〕

Film unit 1 using the present invention and strobe 50 attached to this film unit 1
5, a film unit 1 is covered with a paper box 2, which exposes a photographing lens 4, a viewfinder opening 5a, a release button 6, a film counter display window 7, and a winding knob 15. Holes are provided to allow operation through these holes.

On the other hand, the main body 51 of the strobe 50 is made of plastic, and a transparent plastic cover 53 is attached to the upper front surface, and a charging switch 54 for charging the strobe is arranged below this cover 53. . Further, the side surface of the main body portion 51 is integrally formed with a T-shaped protrusion 51a as shown in the figure, and this T-shaped protrusion 51a has a contact point 5.
6,57 is molded.

As shown in FIG. 3, the film unit 1 includes a front cover 10 made by molding black light-shielding plastic, a main body base 11 in which a cartridge chamber 22 and a film roll chamber 23 are formed.
For example, 135 film 21 loaded in the cartridge chamber 22 and the film roll chamber 23, and the main body base 11.
and a back plate 12 that optically closes the opening on the back side of the holder, and FIG. 3 shows the state before these are assembled.

The front cover 10 has a front surface in which a photographing lens opening 4a and a viewfinder opening 5a are formed, an upper surface in which a hole 6a for a release button 6, a hole 7a for a film counter display, and a strobe 50.
T-shaped groove 10c into which the T-shaped protrusion 51a is inserted
The main body has a side surface formed with a projection 16a, and a protrusion 16a placed on the bottom and serving as an engaging part with the base of the main body. Inside the T-shaped groove 10c, there are slits 10 through which synchro contacts 84 and 85, which will be described later, are inserted.
a and 10b have been established. Further, the left and right side surfaces of the front cover 10 are engaged with the side surfaces of the main body base to form both side surfaces of the unit main body.

At the top of the cartridge chamber 22, there is a winding knob 1.
5 and other winding mechanisms, a shutter charge lever 72 and a lock lever 17 that locks it.
Adjacent to the right side of the shutter charging mechanism and interlocking with the shutter charging mechanism are a film counter mechanism including a film counter display plate 7b, and other parts used in the self-loading mechanism.

Note that the film unit 1 is not provided with a rewind mechanism for the following reasons. That is, when the user purchases the film unit 1, all the films 21 are pulled out from the cartridge 20 and wound into a roll in the film roll chamber. When the user rotates the winding knob 15 each time the user operates the release button 6 to take a photograph, the exposed film 21 is wound into the cartridge 20 one after another. Therefore, the exposed film unit 1 returned to the photofinishing laboratory can be taken out together with the cartridge 20 in a bright room.

The back plate 12 is designed to wrap around the back and bottom of the film unit 1 and tightly shield the film 21 placed therein along with the main body base 11 from light, so that the film 21 is exposed only when the shutter blade 70 is opened. It is starting to be granted. Further, a concave film support portion 27 for holding the film surface under pressure at the exposure position is also integrally molded with the back plate. In addition, a hole 15b for the window eyepiece 5b and the film winding knob 15 is provided.
is also provided on the upper part of the back plate 12. In order to simplify the work of taking out the cartridge 20 in the photofinishing laboratory, a pull-top type opening 28 for taking out the cartridge is formed at the bottom of the back plate 12.

The plastic parts, which are roughly divided into three parts as described above, are each fitted with an accessory part. For example, in the front cover 10, a release button 6 is attached to the release button hole 6a, and an interlocking mechanism (not shown) for transmitting the pressure of the release button 6 to the shutter blade mechanism is attached to the back surface of the front part. The front cover 10 thus formed is placed over the front surface of the main body base 11 equipped with a film winding mechanism, a film counter mechanism, and a self-tacking mechanism. On the other hand, the film 21 is loaded onto the main body base 11 assembled as described above before the back plate 12 is attached. After loading the film 21, the back plate 12 is placed on the main body base 11 by pressing it from the back side, and is fixed to the main body base 11 and the front cover 10 by ultrasonic welding. Thereafter, the unit body 1 is covered with a paper box 2, and the manufacturing process is completed.

In FIG. 2, which is an enlarged view of the main part of the main body base 11, a shutter base 71 integrally formed with the main body base 11 is provided at the center of the main body base 11. Pins 71a to 71g are molded on. A shutter blade 70 is rotatably attached to the pin 71a, and is urged counterclockwise by a spring 74 applied between one end of the shutter blade 70 and the pin 71e. The pin 71b is used as a stopper for the shutter blade 70, and the pin 71c is used as a stopper for the shutter blade 70, and the pin 71c is used as a stopper for the shutter blade 70, and the pin 71c is used as a stopper for the shutter blade 70.
b, and is used to attach the lens board 18 to the shutter base 71. pin 71
d serves as a stopper when the shutter blade 7 is fully opened. Further, the pins 71f and 71g define the rotation range of the shutter operating lever 72.

An exposure opening 75 is provided in the center of the shutter base 71, and normally the shutter blade 70 is provided with an opening 75 for exposure.
Closed by. A groove 76 is provided below this opening 75, in which contact pieces 82 and 83 of a synchro contact unit 80 of the present invention are accommodated. This synchro contact unit 80 includes elongated contact pieces 82 and 83 made of conductive metal, and the contact pieces 82 and 83 made of conductive metal.
2 and 83, and a support member 81 molded with plastic to hold the parts 2 and 83 in a separated state.

The tip of the contact piece 82 is bent toward the contact piece 83, so that the tip of the contact piece 82 reliably contacts the contact piece 83 when the shutter blade 70 is fully opened.
The spacing between the contact pieces 82 and 83 is adjusted. The support member 81 is formed with recesses 81a and 81b, and these recesses 81a and 81b are engaged with hook-shaped protrusions 90 and 91 formed on the outer wall of the film roll chamber 23, so that the bottom of the support member 81 is connected to the film roll chamber 23. The support member 81 is fixed to the main body base 11 by being restricted by the convex portion 92 on the outer wall of the roll chamber 23 .

The ends 82a, 83a of the contact pieces 82, 83 have a shape as shown in the figure, and when the strobe 50 is attached to the side surface of the front cover 10, the contacts 56, 57 of the strobe 50 have a large area. Consideration is given to contact. These ends 82a, 83a
are inserted into the slits 10a and 10b formed on the side surface of the front cover 10 when the front cover 10 is attached to the main body base 11, and are inserted into the T-shaped groove 10.
It is slightly protruded into the inside of c.

In FIG. 4 showing the internal structure of the strobe 50, the charging switch 54 has a covering part 5 formed of soft plastic on the surface to prevent electric shock.
5. It is composed of a resilient metal convex contact piece 56, an insulating washer 57, and a metal plate-shaped contact piece 58 that are closely placed behind it, and when the covering portion 55 is pressed, the convex contact piece 56 is recessed as shown by the broken line and comes into contact with the dish-shaped contact piece 58. The signal from the contact between the convex contact piece 56 and the dish-shaped contact piece 58 is input to the strobe circuit 59, and as a result, the capacitor provided in the strobe circuit 59 receives power from the AA batteries 60. It will be charged.

A neon lamp 61 is attached to the upper part of the rear wall of the main body section 51, which lights up when the strobe is fully charged to notify that the flash is ready. In addition, the main body 5
A discharge tube storage chamber 51a having an umbrella-shaped cross section as shown in the figure is formed integrally with the main body 51 on the upper part of the front wall of 1, and the inside thereof is plated with metal to give a mirror finish. A discharge tube 52 filled with xenon gas (Xe) is attached to the discharge tube storage chamber 51a, and is connected to a strobe circuit. The cover 53 is fitted around the discharge tube storage chamber 51a to protect the discharge tube 52 and to flatten the light distribution characteristics of the discharge tube 52. Although not shown in Fig. 4,
The contacts 56 and 57 are connected to a trigger circuit in a strobe circuit 59.

Next, the operation of the present invention will be explained. First, from the front of film unit 1, flash 5
0 of T-shaped protrusion 51a of film unit 1.
If you slide it into the letter-shaped groove 10c and push it in,
As shown in FIG. 1, contact 5 on the strobe 50 side
6 and 57 are brought into contact with the ends 82a and 83a of the contact pieces 82 and 83 of the synchro contact unit 80 incorporated in the film unit 1, respectively, and the strobe 5
0 is attached to the side of the film unit 1.

When the charging switch 54 is pressed with the left index finger, the convex contact piece 56 is recessed as shown by the broken line in FIG. It starts to flow. When sufficient charge is accumulated in this capacitor, a neon lamp 61 lights up, indicating that charging is complete.

When the winding knob 15 is rotated to wind up the film 21 by one frame, the shutter operating lever 72
resists a strong spring (not shown), climbs over the protrusion 70a of the shutter blade 70, rotates from the pin 71g side to the pin 71f side, and is locked by the locking lever 17. When the release button 6 is pressed, the shutter operating lever 72 rotates vigorously from the pin 71f side to the pin 71g side while pressing the protrusion 70a. Then, the shutter blade 70 is rotated to the position shown by the dotted line in FIGS. 1 and 2, and the opening 75 is fully opened. At the same time, the tip of the shutter blade 70 presses the contact piece 82, and the tip of the contact piece 82 contacts the contact piece 83.

At this moment, the ends 82a, 83 of the contact pieces 82, 83
A short-circuit signal is supplied to the trigger circuit in the strobe circuit 59 via the strobe circuit 59, and the high-voltage charge stored in the capacitor flows into the discharge tube 52 to emit light, providing auxiliary illumination to the subject. At the next moment, the projection 70a of the shutter blade 70 comes off the shutter charge lever 72, and the spring 7
4. Then, the shutter blade 70 comes into contact with the stopper 71b and stops, and the opening 7
5 is closed. Note that the neon lamp 61 is turned off at the same time as the discharge tube 52 is discharged and emitted light, and is not turned on until the capacitor is charged again. When the pressing of the charging switch 54 is stopped, the convex contact piece 56
returns to the position shown by the solid line in FIG. 4, and charging of the strobe circuit 59 is stopped.

Although the example in which the synchronizing contact unit 80 of the present invention is incorporated into the lens-fitted film unit 1 has been described above, the present invention can be similarly applied to inexpensive cameras not equipped with a synchronizing contact mechanism.

In the embodiments described above, a shutter blade is used as a means for pressing and closing the contact piece of the synchro contact unit of the present invention. It may also be by means of releasing the

[Effect of idea]

As described above, the synchronizing contact unit of the present invention has an extremely simple structure consisting of a pair of elongated contact pieces and a support member that holds the pair of contact pieces in a separated state. Then, attach this to the front part of the main body base where the shutter blade is incorporated,
By simply installing one contact piece in the travel path of the shutter blade of the film unit and exposing the other contact piece to the mounting part of the strobe device, it is possible to obtain a synchronization signal when the shutter blade is fully opened. This makes it possible to take flash photography without increasing the cost of a film unit with a lens or an inexpensive camera.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an embodiment of the present invention in which a strobe is attached and the main parts are cut away and shown. FIG. 2 is a schematic diagram of essential parts of an embodiment of the present invention. FIG. 3 is an exploded perspective view showing one embodiment of the present invention. FIG. 4 is a sectional view of the strobe. FIG. 5 is an external view of an embodiment of the present invention and a strobe attached thereto. 1...Film unit, 4...Photographing lens,
10...Front cover, 10c...T-shaped groove, 11
...Main body base, 12...Back plate, 20...Patrone, 21...Film, 7...Shaft blade, 8
0... Synchro contact unit, 82, 83... Contact piece, 90, 91... Hook-shaped projection.

Claims (1)

[Claims for Utility Model Registration] (1) The main body base is equipped with a shutter blade for opening and closing the exposure aperture through a mounting member provided at the front of the main body base, and one end thereof is the shutter blade or means for opening the shutter blade. installed on the travel route of
It is composed of a pair of elongated contact pieces whose other ends are exposed to the mounting portion of the strobe device, and a support member that holds the pair of contact pieces in a separated state and is attached to the attachment member, and A synchro contact unit characterized in that the contact piece is pressed and closed when the exposure opening is fully opened. (2) A utility model registration request characterized in that a groove is provided in the front part of the main body base between the exposure opening and the bottom of the camera, and the contact is housed in the groove. A synchro contact unit as described in scope 1. (3) The synchro contact unit according to claim 1, wherein the support member is integrally molded with the contact piece by plastic molding. (4) The synchro contact unit according to claim 3, wherein the support member is attached to the attachment member by fitting.