JPS61160729A - Waterproof device of camera - Google Patents

Abstract

PURPOSE:To obtain a waterproof device which can be operated with a force similar to the force required for a general camera, by forming a waterproof packing into a hollow shape and charging a fluid into the packing and making the pressure of the fluid at the cover closing time different from that after closing of the cover. CONSTITUTION:When a rear cover is opened, power is supplied to a coil 11 by a signal from a switch 1j, and a solenoid valve 8 is moved right in the figure. An exhaust port 6b is opened, and air in a packing tube 3 is connected to the external; and therefore, if the rear cover is pushed from the rear when the rear cover is closed after film loading, the packing tube is pushed by a projecting edge part 2b and is easily crushed, and a claw 2c pushes the outside inclining part of a lock claw 4a in the camera side to push it down against a spring 5, and the claw 4a is restored upward when the claw 2c gets over the claw 4a, and the rear cover is locked. When a notched gear 19 is rotated in the direction of an arrow, a piston 17 compresses air in a cylinder 14, and compressed air is sent into the packing tube 3 through tubes 12a and 6a.

Description

[Detailed description of the invention] (Application field) The present invention relates to a waterproof device for a camera.

(Prior Art) Gaskets such as Cζ0S/G have been used for the back cover of waterproof cameras, electric lids, and various knobs.

This is based on the idea of using the excessive elasticity of the O-ring to apply external pressure to it and crush it, filling small gaps with surrounding structural members with just the right amount of pressure. When closing the back cover of a camera like this, the force of crushing the above-mentioned gasket against the blade of a normal pressure plate spring is a force of Ω.
However, it required a large amount of power and was difficult to operate.

(Summary of the Invention) The present invention aims to solve the above-mentioned conventional drawbacks and provide a waterproof device that does not require a large force when closing the back flap and can be operated with the same force as a general camera. purpose.

For this reason, the present invention! In this case, a waterproof gasket provided at the joint between the camera body and the backrest or other opening/closing lid is formed hollow, and fluid is injected into the gasket, and the fluid is released when and after the lid is closed. It was configured in a way to change the pressure.

The present invention will be described in detail below based on the illustrated embodiments.

(Example) Figure 1 shows a camera equipped with the device of the present invention with its back cover open!
%n'), where l is the main body of the camera 2 including the camera 2 cover, la is the lens barrel, and lb is the hinge part. Reference numeral 2 denotes a back cover that is attached to the camera body so as to be openable and closable with a hinge 2a and holds a film pressure plate (not shown), a low tool, etc., and when the back cover is closed, its protruding edge 2b connects to the convex portion 1c of the camera body.
, ie, the lock claw 2c is engaged with the lock claw 4a on the camera side and locked. The lock lever 4 having a lock claw 4c is held slidably only in the vertical direction by a guide member 19, is urged upward by a spring 5I, and is moved to a locking position with the lock claw 2c on the back cover by a stopper (not shown). When the armature 4b fixed at the bottom is attracted by the electromagnet 1h, it descends against the spring 5I and the claw 4
The engagement between a and 2c is disengaged. if is a back cover opening/closing button provided on the top of the camera, the surface is sealed integrally with the cover with elastic rubber, and the
A power supply switch 1f to the electromagnet h is provided, and when the cough button 1f is pressed with a finger, the electromagnet is excited and the back cover is unlocked. Reference numeral 64 denotes a nitrogen feed switch that is pressed and closed by a projection 2d provided on the back cover.

3 is a waterproof pack / that fits into the groove 1a circle of the camera body,
It is made of a flexible material such as in-prene rubber and has a hollow chain shape, and a connecting pipe 3a is connected to the compressor unit via the 'ta pulp section 6, as shown in FIG.

In FIG. 2, the connecting pipe 3a of the para-chubby chain 3 is connected to the cylinder 6a of the electromagnetic pulp section 6 by a connector, and the pulp section is connected to the joint section 1 connected by the connector 13.
The outlet port 14a4C of the pump 14 is connected to the outlet port 14a4C via the outlet port 2. Reference numeral 8 designates an electromagnetic valve whose guide portion 8a is fitted with a structural member 10 and is slidably supported in the left-right direction in the figure, and is attached to the left by a spring 9 provided between the collar portion 8b and the structural member 10. The pulp 8e hits the impact portion 6C and blocks the discharge port 6b, and the pulp 8d maintains its airiness based on the guide portion opening 6d. The pulp 8 forms a plunger together with the amateur chair part 8C contained in the coil part 11, and when the coil 11 is energized, it slides to the right in the figure to open the discharge port 6b.

In the state shown in FIG. 2, the pulps 8e and 8d face each other and have approximately the same area, so that the air pressure in the pulp circles is evenly distributed in the left and right directions in the figure.

14 is a cylinder that forms a known pump together with a piston 17 and two fP15.16, and a valve 15 is rotatable around a shaft 15a at the discharge port 14a and is biased in the clockwise direction. A valve 16 is attached to the shaft 16 at the intake port 14b.
It is attached so that it can rotate around a and is biased counterclockwise.

The piston 17 is urged to the right in the figure by a spring 18,
A rack provided on the piston rod 17b meshes with a notched gear 19 and is driven by a motor to be described later. 17a is a piston ring. 20 is a clutch unit consisting of an electromagnetic clutch as shown in FIG. 3 and a reduction gear train (not shown), and 21 is a motor. 22 is a charging system for film winding, shutter, etc., which are all well known, so please read them in detail! Eleventh explanation will be omitted.

Figure 3 shows the clutch unit, and 25 is the shaft 25.
The sun gear 33 rotates around a, the arm 29alC of the lever 29 rotating coaxially is supported by a planetary gear that meshes with the sun gear 25, and the spring 3d and the tension washer 33
b gives an appropriate amount of friction to the threshold between the shaft portion 33a and the arm. 31 is a gear connected to the notched gear 19, 26 and 27 are charge system gears that rotate around a shaft 28, and 26 is always engaged with the sun gear 25, and the protrusions 26a and 27a j are engaged with each other. ing. The driving force from the motor is gear 2). 2nd gear 2
When the sun gear rotates in the direction of the arrow A, the lever 29 also rotates in the direction of the arrow A, causing the planetary gear 33 to mesh with the gear 31 and rotate the notch gear 19, causing the sun gear to rotate. When the lever 25 rotates in the opposite direction to the arrow, the lever 29 also rotates l in the same direction to disengage the planetary gear 33 and the gear 31. Reference numeral 32 denotes a glass/jar whose conduction is controlled by a circuit to be described later, and when energized, the iron core 32a engages with the poetry arm 29b inserted into the path of the narrow arm 29b of the lever 29, thereby preventing the lever 29 from rotating. .

Figure 4 shows the control circuit of the camera, and 51 is the power supply 5.
0 is an IC that controls the winding and compressors 14 to 17, 52 and 61 are transistors that rotate the motor in the winding direction, 54 and 59 are transistors that reverse the motor, and 21 is the counter electromotive force of the motor. Zener diodes 57 for absorption are connected in a parallel row.

53.55, 58, 60 are voltage drop resistors, 6
2.63 is an electric plate transistor which turns both poles of the motor 71- and is controlled by the winding control 1050 mentioned above.

1h is the above-mentioned back cover locking area magnet, and the transistor 68 is controlled by a signal from 1050 to perform excitation and demagnetization. 1j is a switch linked to the above-mentioned back cover opening/closing button, 64 is a known blank feed switch that detects the closing of the back cover and starts the blank feed operation of the film, and 66 is a graph/
The transistor 67 that controls the jar 32 is a known lO that controls the shutter and AP. Next, the operation of the non-device will be explained.

When the back cover is opened to load film into the camera 2, the coil 11 is energized by the signal from the switch 1j, and the TA pulp 8 shown in FIG. 2 moves to the right in the diagram. . As a result, the discharge port 6b opens and the packing tube 3
The air inside is in communication with the outside, so when you press the back cover from the rear when closing the back cover after loading the film, the packing chape is pushed against the protruding edge 2b, as shown in Figure 5(a). Easy IζTun: The aforementioned claw 2C presses the outer slope of the locking claw 4m of the camera hook and pushes it downward against the spring 5. When the claw 41 is overcome, the claw 41 returns upward and the back cover is locked. The force pushing the back cover at this time is as strong as that of a normal camera that does not have an O-ring etc.'w When the above-mentioned blank feed switch 64 is turned on by closing the cover, l
The signal from 050 turns on transistors 52 and 61, causing the motor 21 to rotate in the forward direction, that is, the winding direction, and turns off transistor 65, cutting off the current to the coil 11. Therefore, the electromagnetic pulp 8 is moved to the pressure shown in the figure by the force of the spring 9, and the discharge port 6b is closed as shown in FIG. By normal rotation of the motor 21, gears 2) to 25 shown in the third diagram are activated.
gears 26.2 that rotate in the directions of arrows and mesh with the gears 26.2 and 26.2.
7 also engages the missing circumferences 26a and 27a and rotates in the direction of the arrow, driving a film feeding mechanism (not shown) to feed the film 2.
At the same time, the lever 29 also rotates in the direction of the arrow λ, the planetary gear 33 meshes with the gear 31, and the rotation of the motor is transmitted to the notched gear 19. When the notched gear 19 rotates in the direction of the arrow from the position shown in FIG.
The piston 17 moves to the pressure against the pressure and compresses the air in the cylinder 14, so the valve 15 rotates counterclockwise against the spring and opens, and the compressed air is released with the valve 16 closed. is fed into the packing cheep 3 through the tubes 12a, 6a.

When the piston 17 moves a predetermined stroke, the notch of the gear 19 comes to the meshing position with the hook, so that the meshing between the two is released, and the piston 17 is quickly returned to the right by the spring 18. During this return process, the valve 15 is closed and the valve 16 is opened to suck the air inside the camera into the cylinder through the intake port 14b. When the piston 17 returns to the specified stroke, it engages again with the cutting gear 19 or 9 gear 17b, moving the piston to the left as described above to perform a compression operation. In this way, as the motor 21 rotates in the winding direction, the pressure of the air inside the packing chain 3 is increased by the compressor unit of the cylinder 14 and pin 17, as shown in Fig. 5 Φ). The gap between the mating part of the camera body and the back cover, that is, the gap between the body and the protrusion 2b of the back cover is filled by the internal pressure of the pump tube 3. At this time, the back cover 2 is closed by the claw 4a as described above. Since it is locked by engagement with 2C, the gap between it and the main body will not widen unless the back cover itself works, and if the rigidity of the back cover is made strong enough, the gap between the para chain and the surrounding wall will increase. The adhesion force increases in proportion to the pressure within the tape.

The internal pressure of the packing tube 3 can be freely set depending on the volume of the cylinder 14 and the reduction ratio of the switching wheel 19, so it can be set so as to obtain a predetermined waterproof pressure during a predetermined film feed operation. It is possible.

When the predetermined number of film feeds are completed, an end signal is generated from a detection mechanism (not shown), such as a sprocket or a counter, and the l050 turns off transistors 52 and 61, turns on transistors 54 and 56, and turns the motor to a predetermined value. Reverse briefly. Due to stiffness, gear 2) shown in the third figure
26 and 33 rotate in the opposite direction of the arrow, and the lever 29 also rotates in the opposite direction to the arrow and stops when it hits a stopper (not shown), and the gears 33 and 31 are disengaged. The gear 27 is designed to remain in the same position until the gear 26 rotates about one rotation and the protrusion 26a comes into contact with the protrusion 27a, but this reversal of the motor ends in the time it takes for the gear 26 to rotate approximately one hand. Therefore, it is not transmitted to the film feeding system. Thereafter, the transistors 54 and 59 are turned off, and the current to the motor is renewed to ns.The transistors 62 and 63 are turned on, and the motor is immediately stopped by applying an electric brake, thereby completing the preparation for photographing.

Next, the operation during shooting will be explained.

When the release button (not shown) is pressed to complete the exposure operation, a shutter completion signal is issued from the shutter 067 to the winding l050, transistors 52 and 61 are turned on, the motor starts rotating forward, and the transistor 66 is turned on.
is turned on, and the plunger 32 is also energized.

As the motor 21 rotates, the gears shown in wc3 rotate in the directions of the arrows, but the lever 29 is connected to the iron core 32 of the plunger 32.
Since a protrudes to the position indicated by the dotted line, it stops after only a slight rotation, and the gears 33 and 31 do not mesh with each other, so no power is transmitted to the piston I7fζ.

On the other hand, the driving force of the motor is transmitted to the film feeding system through the gears 26 and 27, and when the film is fed by one frame by a known winding mechanism, the winding completion signal from the known winding stop means etc. causes the machine 050 to stop. The motor is de-energized, transistors 62 and 63 are turned on to form a motor seat circuit, and the motor is braked to stop it.

Subsequent shots are taken sequentially in the same manner, and when the last frame of the film has been shot, a known auto-reverse mechanism is activated and, for example, if a winding completion signal is not received even after a predetermined period of time has elapsed from the start of winding, the 1050 will turn off the motor. Rewind the film by reversing it.

Thereafter, the l050 stops the motor in response to a film end signal issued from, for example, a film presence/absence detection switch, and film rewinding is completed.

Next, when the photographer presses the back cover opening/closing button 1f to remove the film from the camera, the switch 1j turns on and l050
energizes the coil 11 of the electromagnetic pulp 8 to move the pulp 8 to the right in the figure and open the discharge port 6b,
After sufficiently discharging the air in the loop and eliminating pressure on the engagement surface between the lock claws 4a and 2C, energize the magnet 1h to attract the claw lever 4. From this, the back cover is locked. Release. As a result, the back cover is lifted up by the force of a pressure plate spring (not shown), and when opened by hand, it returns to the state shown in FIG. 1.

Figures 5g and 6 show another embodiment of the present invention, in which the above-mentioned packing cheek and a known O-ring are used together. In the figure, 71 indicates an O-ring, 72 indicates a sub-tip, and the same members as in the above embodiment are indicated by the same reference numerals. - The subenamer 72 is made to have a size that allows it to slide within the groove ld of the camera body, and as described above, when pressurized air is injected into the packing chamber 3 and its volume increases,
Pushed by the chain, the O-ring 71 moves to the right in the figure and is squeezed between the O-ring 71 and the back N2b, thereby filling the gap and making it waterproof. In this case, the cross-section of the packing tip will have a cross-section along the wall formed by the main body groove and the spacer, and will not fit between the spacer and the wall.

In this example, the packing tube is used to compress the ()su/g, and waterproofing is done by an O-ring, so the packing tube does not come into contact with water, so it can also be made of a hydrophilic material. .

In addition, if the O-ring is made of silicone rubber and the main body and back cover are made of a material such as polyacetal (poM), it is possible to create a camera that can be placed not only in water but also in solvents.

In the example, 9 ki was added to the pakki gf and -p yen, but
It is also possible to use an inert gas or liquid material, and in this case, the inlet port 14 and the outlet port 6b shown in FIG.
Just connect it to the built-in tank.

(Effects of the Invention) As described above, according to the present invention, it is possible for women to open and close the back cover of a waterproof camera by simply pressing the back cover with the same small force as with conventional non-waterproof cameras. Now we can offer waterproof cameras that can be used for Furthermore, the water resistance can be increased to any degree by simply increasing the internal pressure of the packing cheep, and the depth of water at which the camera can take pictures can also be improved.

Although the present invention has been described in detail with respect to the back cover of a camera, it is not limited thereto, and the same effect can be obtained even if it is applied to other opening/closing covers such as a one-piece cover.

[Brief explanation of the drawing]

Figure 1 is a perspective view of the camera with its back cover open;
The figure is a perspective view showing the reduction gear and the two shafts, Figure 3 is an explanatory diagram of the compressor unit, Figure 4 is the circuit diagram, and Figure 5 is the waterproof parapet. In the cross-sectional views showing the state of /, (a) shows the state before pressurization, and (b) shows the state after knife pressure. FIG. 6 is a sectional view showing the state of the waterproof packing in another embodiment. l: Camera body, lbS section number, 1d: Body groove. l: back cover opening/closing door, ih: area magnet, 2: back cover 3: waterproof gasket, 4: lock claw lever, 6-17: compressor unit, 21: motor, 22: charging mechanism

Claims (3)

[Claims] (1) In a camera that has a waterproof packing at the joint between the camera body and the opening/closing lid, and the waterproof packing is compressed when the opening/closing lid is closed to maintain the airtightness of the camera body, the waterproof packing is made of hollow elastic material. 1. A waterproof device for a camera, characterized in that the device is formed of a body, and after closing an opening/closing lid, a fluid is injected under pressure into the waterproof packing. (2) The camera according to claim (1), which includes a built-in compressor, and operates the compressor based on the camera's shooting preparation operation to inject fluid under pressure into the waterproof packing. Waterproofing device. (3) The waterproof device for a camera according to claim (2), wherein the compressor operates in conjunction with the film feed operation of the camera.