DE1965161A1 - Shutter mechanism in a camera - Google Patents

Description

Pafenvanwalt

Dr. Helmut Späth 60 P 6

8200 Ro5o; ihc! In / 0hb.
Max-Josefs-Platz 6

Germany

ZENZA BROHICA KOGTO KABUSHIKI KAISHA / Tokyo / Japan

Shutter mechanism in a camera

The invention relates to a locking mechanism in one Camera.

The purpose of the invention is to create a locking mechanism of a focal plane shutter, the actuation time of the rear membrane following the actuation of the front membrane being positively controllable by a transistorized control circuit in association with the shutter mechanism.

A further purpose of the invention is to provide a closure mechanism of the type mentioned, in which the closure membrane can be actuated as soon as the actuation mechanism assigned to it comes into play in order to achieve the high-speed closure speeds.

Another object of the invention is to provide a shutter mechanism in which the mechanical contact between the shaft associated with the front diaphragm and the hollow shaft or drum associated with the rear diaphragm is eliminated to achieve a positive and accurate shutter speed even in that To achieve the case of shutters running at low speed.

009834/1264

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Another purpose of the invention is to create a locking mechanism, which can be used with advantage in connection with the electronic synchronization device.

Another purpose of the invention is to create a locking mechanism provided with a locking safety element, wherein the shutter operating mechanism does not come into play until the film winding and shutter tensioning is complete are.

The invention is erfc in more detail below with reference to the drawings purifies. Show it:

Fig. 1 shows an embodiment of a locking mechanism according to the invention in perspective representation,

2a shows a part of the closure

forming gear in operative connection with a front closure membrane in plan view,

Fig. 2b a part of the closure

according to Fig. 1 forming gear in wir-

) connection with a hin

teren sealing membrane,

3 shows a part of the closure

forming control circuit for controlling the actuation of the rear closure membrane,

Jig. 4 a diagram rare

the mode of action of the posture Fig. 3,

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BATH ORIGINAL

1965181

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a modified embodiment part of the rear membrane attachment device forming part of the closure in top

Fig. Δ "components of the closure according to

Figo 1 forming waves in association with the front and rear locking mechanism in an enlarged sectional view

steepness,

Fig. 7 essential parts of a one

safety device assigned to the closing button in perspective illustration 5

FIG. 8 shows the safety device according to FIG.

i ^ i ™ ^: ^ position when pressed by hand: -: "3." ^: "" ^: -. .luS button j

Fig. 9 the security ^, vcichtu.:..g according to Figo7

in the Betriebstei._ig, whereby the VersclilOßknopf released with regard to a pressure exerted by hand

is.

According to FIG. 1, a front sealing membrane 1 is wound around a winding drum 3 at one end and attached to a bracket arm 5 at the other end. A helical spring (not shown) surrounds the drum 5 and is normally pretensioned in the sense of executing a clockwise rotation under the unwinding force of the spring. The membrane 1 is pretensioned by belts 6, attached to the bracket arm 5 and wound around rollers 7 »7, which are attached to external shafts 4, which are smoothly two-sided for a rear closure.

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Membrane 2 is used = This latter is wound into a shaft 9 and pretensioned by belts 11, 11, which on another Bracket arm 10 are attached, which carries the free end of the membrane 2, as well as being wound on a drum by guide wheels 12, 12 which are arranged coaxially with drum 3 » The drum 8 surrounds a coil spring (not shown) and is normally in the sense of performing a clockwise rotation under the rewinding force of the spring in the same way as "above" with respect to the front closure membrane 1 described, preloaded.

A pinion 13 is a gear 14 attached to the shaft 4 meshes with the pinion 13 and has an engagement pin 18 on its upper surface »

The pin 18 cooperates with the front end part of a latching member 16 which is pivotably mounted on a pin 15 in the manner described below. A pinion 19 is attached to the shaft 9 and is in engagement with a gear 20, which is mounted coaxially with gear 14 «A protrusion 24 is attached to the upper surface of the gear 20 and serves to interact with a stop 22, which is attached to the * opposite side of the gear 14 is provided »A im essential L-shaped latching member 23 is pivotable about a Pin 24 mounted so that its one end normally with the projection 21 can come into engagement “An iron segment 26 is attached to the other end of the latch member 23 and is for attraction against an electromagnet 27 against the action a spring 28 determines when the electromagnet 27 has current flowing through it is »A curved connecting lever 29 is mounted pivotably about a pin 30 and has a projection 29a to be brought into engagement with the other end of the latching member 16. The connecting lever 29 has a raised Part 29b, which is designed to interact with a mirror drive unit 31 is determined ",

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BATH ORIGINAL

161

The raised rope 29b is offset) -and the lever 29 is in Meaning of performing a clockwise rotation, based on the Direction of view according to FIG. 1, biased when the mirror mounted in the camera housing is in a position inclined by 4-5 ° is brought «.

A switch S1 is a release lever 32 and a switch S2 one end of the lever 29 associated with a switch S3 is associated with one end of a pivot mounted about a pin Lever 34 - »the one at the other end with a projection 33 is engaged on the gear 14-. A switch S4- is in Assignment .zu a leaf spring 35, which with the projection 33 in Intervention is to be brought. A Sehalter S5 is assigned a leaf spring attached to the gear 20 with a Pin 36 is to be brought into engagement »

The control circuit according to FIG. 3 for the rear closure membrane is transistorized, whereby the membrane can be activated after a certain time interval has elapsed, for example from the time the front membrane 1 is activated. A capacitor 01 is located in the base circuit of a transistor T1. The aforementioned switch S3 is in series with the capacitor 01, which was charged by a variable resistor R1 when the switch S3 is open »The resistor R1 is mechanically assigned to a Ver circuit scale 37? as indicated by the dashed line in FIG.

The capacitor 01 is in series with the resistor RI. the Capacitor charging time. 01 can be changed by the resistance R1 is brought to a desired value.

A resistor B2 is in the collector circuit of the JEransiators T1 inserted. Transistors T2, T3 are connected to one another in such a way that that the transistor T2 is conductive and the transistor T3 become non-conductive when the potential difference across the two

009834/1254

Connections of the capacitor C1 equal to a certain value Vgs is »The already mentioned electromagnet 27 is in the collector circuit of the transistor T3 ° Sin switch S5 is in Series with an electrical power source E and switch S1, which in turn is parallel to switch 2 »The switch S4 is mechanically coupled to a switch SV to provide a Connection between a Σ-contact and a. Y-socket near · = si lead «

The operation of the shutter mechanism _s far described and explained below veranschaulichtj "

According to Figo 1, the shutter mechanism is in the operating position, wherein a film wound up and the shutter for the photographer! Older be tensioned "In the illustrated operative position, the switches SI, S1 ', S2, open S4, while the switches SJ ₁ S4- , S5 are switched on »

When the release lever 32 is pressed, the switches S1, S1 ^{1 are} closed. When the switch S3 is still in the "Abschalf" position, the transistors Ti, T2 are in the switched-off state. However, the transistor T3 is biased forward by the resistor R4, so that the electromagnet 27 carries current and the iron segment 26 together with the Latching member 23 is magnetically attracted against the electromagnet 27. The foremost part 25 of the latching member 23 strikes against the projection 21 on the gear 20 so that this is positively locked against rotation.

'During further pressing of the release lever 32, the mirror driving unit 31 comes into operation and a (not shown) begins to mirror from the light path zurückzusieliezu

When the mirror is completely removed from the light path, the will. Raised part 29b on the connecting lever 29 by means of the mirror drive unit 31 in the direction of the arrow ψοη fig. 1 in

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^: 'Ä-eiy * BADORIGINAL

1.96516

Rotation set, the connecting lever 29 clockwise is rotated against the force of the spring, namely to at the same time as switch S2 is closed »If the Switch S2 to the Sehalter Si in association with the release lever 32 is connected in parallel, the electromagnet is located 27 with the mentioned clockwise rotation of the lever 29 in Stromdurchflossenen'Zustand, wherein the latching member 16, which is with engages pin 29a, rotated counterclockwise so that the front sealing membrane 1 is now actuated by the pinion 13 * With the actuation of the front sealing membrane 1, the stop member 22 on the gear 14 is moved away from the projection 21 on the gear 20 «. Located at that time the latter is still engaged with the foremost Part 25 of the latching member 23 and is prevented from rotating, so that the rear closure membrane is also attached their activity is prevented «.

With the start of rotation; DES gear 14, the projection 33 egt to the latter from the engagement with the lever 34 in association with the switch S3 wegbetv ^T, xtan the lever 34 of the switch S3 is turned clockwise to the opening ₉ -so that the capacitor 01 in the transistorized control circuit according to FIG. 3 is charged with the current which is supplied from the current source E via the variable resistor R1.

When the potential difference between the connections of the capacitor G1 is equal to the value Vgs, the transistor T2 becomes conductive, while the transistor T3 becomes non-conductive, so that the electromagnet 27 is now switched off « -.

If the capacitance of the capacitor CI and the potential E of the Current source remain changed and the value Vgs is constant, the charging time of the capacitor changes with the change of the resistance value of the variable resistor R1 »Fig. shows the relationship between the change voltage and the charge time of the capacitor 01, where the variable resistance

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If Ei was set to values r1 -and r2 is set, if the variable resistance E1 is set to the value r1, the capacitor Ci is charged in a time ti to the value Vgs -... When the variable resistance Ei is set to If the value r2 is set, the capacitor 01 is charged to the value Ygs in a time t2 _D

As seen from Jig. 4- results, the shutter speed can be adjusted to the desired value by setting the ohmic resistance of the variable resistor E1 on the shutter speed scale to be brought"

When the solenoid 27 is turned off, the inlet member 23 rotated counterclockwise under the force of the spring and forced to move away from the projection 21 on the gear 20 so that the latter is forced to move into To rotate clockwise, and the reverse. Sealing membrane is actuated by the pinion 19. After the closure has been closed, the projection 36 on the gear 20 comes into stop contact with the switch S5>, so that it is switched off and the current from the current source E is no longer the Control circuit for the rear closure membrane is supplied »The above-mentioned operating cycle of the closure can be in in the same way as described above " will.

As can be seen from the preceding description, the application time of the electromagnet 27, which forms part of the actuation mechanism for the rear membrane, can be "due to the ability to switch switches S1 to S5 on and off in relation to the release lever and the mirror drive as well as." the front closure membrane can be adjusted as desired so that the operation of the closure mechanism can be carried out positively and accurately in comparison with a known mechanical control device »

009834/1254 - 9 -

BATH ORIGINAL

The various shutter speeds can be selected as desired on the locking scale according to the tapped position on the variable resistor R1 can be specified in a scale division, so that the shutter speed adjustment in the most simple Wise can be accomplished »The inventive method * · Locking mechanism can be used with advantage as a focal plane lock, which is used on a camera of large, medium, or small dimensions can be attached

According to FIG. 5, which the latching member 23 and the projection 21 shows on the gear 20 in association with the latching member 23, the foremost engagement part 25 of the latching member 23 is inclined at an acute angle α with respect to the tangential direction of the Cut off gear. The projection is similar 21 'cut obliquely on the gear 20 at the same angle, so that an inclined surface 21 'arises which is in contact with the obliquely cut foremost part 25 of the latching member 23 is to be brought. -

When the electromagnet 27 has current flowing through it and the foremost engagement part of the latching member 23 comes into engagement with the correspondingly beveled counter surface 21 'on the projection 21, the closure membrane 2 is prevented from being actuated. At this time, a component P acts tangentially and a component Q radially on the foremost part 25 of the latching member 23. When the electromagnet 27 is switched off after a certain time interval following the actuation of the front closure membrane, the latching member 23 is pivoted about the pin 24 · under the rewinding force of the spring 28. In this way, the foremost part 25 of the link 23 is moved out of contact with the inclined mating surface 21 \ on the projection 21. In this way, the gear 6 is forced to rotate and the sealing membrane 2 is now put into operation.

As can be seen from Fig. 5, the inclined surface 21 'strikes on the

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Protrusion 21 under pressure against the foremost engagement part 25 of the latching member 23. As long as the projection 21 is in engagement with the foremost engagement part 25 of the latching member 23, the component Q acts in the sense of a release of the the latter out of engagement with the projection 21 = When the Electromagnet 2? is switched off, the component Q acts of = art that the locking member 23 can be easily set in rotation, just as if the spring 28 "were not provided, and the rear membrane can be operated synchronously with the deactivation of the electromagnet 27 =

According to Figo 6, which is a detailed construction of Rear membrane guide shaft 2 and rollers 7 »7 in Attachment to the guide shaft 4 shows are bearings 38, 38 in one piece with tubular parts 39? 39 trained «, The hollow shaft 4 molded into a drum 4a is on rotatably attached to the tubular parts 39, 39 by the bearing elements in a manner not shown »a spindle 4b extends through the hollow interior of the guide shaft 4 and is attached to the rollers 7, 7 at both ends. The spindle 4b strikes the inner peripheral surfaces 39b, 39b of the tubular parts 39> 39 at. The pinion 13 is on the leftmost part of the spindle 4b attached.

When the lock is released, the belts 6, 6 _{unwind with the rotation of the rollers 7, 5,} 7 'attached to the spindle 4b which is rotated axially in sliding contact with the outer peripheral surfaces 39a, 39a of the bearings 38, 38. According to Fig. 6 there is no direct mechanical contact between the spindle 4b and the drum 4a, so that the actuation of the front and rear membrane is not adversely affected by the frictional contact of the moving parts in association with this and fluctuations in the shutter speed can be positively avoided The number of components can also be reduced and the camera can be miniaturized. .

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^ - ■ · '■ -. SAD ORIGINAL

. - / ■ 1965181

The locking safety device shown in Pig 7-9 serves to achieve a foolproof operation of the locking mechanism = a gear 4-1 meshes directly or through an intermediate gear with a gear 43, which is attached to an operating handle that is used to wind the film and tension the shutter An annular rib 44 is formed concentrically therewith on the top surface of gear 43 and is cut out 4-5 for engagement by one end 46 'of a three-armed lever 46 which is rotatably supported by a shaft 47 ο The end 46 "of the lever 46 is assigned to a leather 48, which tries to rotate the lever 4-6 around the shaft 4-7 in such a way that the end 46 'is moved out of engagement with the cutout 45 of the hip 44» One end 46 '"of the lever 46 is in engagement with the foremost part of the mentioned lever 40. An L-shaped lever 49 is pivotably mounted about a pin 51 and is counterclockwise rotation through the. Force of a spring 52 brought into stop contact with a projection 50 on the mentioned lever 40 "An Ir-shaped stop lever 53 has a stop pin 54 which can engage with a bent hand 4-9 * a hook surface 49" of the lever 49 « The foremost part of an arm 53a of the ÄnsG & l8. £ M ^ .Is 53 is designed by virtue of its arrangement to abut against the end part of the upstanding flange 40 "attached to the lever 40, or to slide against the lateral surface of the flange 40 '<. Another arm 52b of the lever 53 strikes a stop 57 by virtue of a corresponding arrangement and design. ₅ which is attached to the camera housing, under the force of a spring 56, while a foremost part 53'b rests on the hip 44- =

A release pin 58 protrudes from the safety gear 41 of the closure mounted within the annular lip 44. A guide pin 59 engages with a slot 60 and is designed to slide on the mentioned lever 40.

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lays. A movable stop 61 is the film winding mechanism assigned so that the stopper 61 is moved to the left when the film for photographing is wound, however, it can be raised to the chain-dotted position before the film is wound up to allow the movement of the three-armed Lever 46 and thus the operation of the ■ shutter operating mechanism to slow down.

When the handle 42 is rotated by hand to achieve full rotation of the gear 41 and the film is wound up are, the annular rib 44 on the gear 41 comes to a stop with the cutout 45 facing the End 46 'of the three-armed lever 46, as illustrated in FIG. 7. Then the lock button is pressed and the lever 40 assigned to this pushes the end 46 "'of lever 46 to the left (in the direction of view of FIG. 7). When the movable Stop 61 is moved to the position shown in FIG. 1 in solid lines, the lever 46 is free to move around the Rotate shaft 47, allowing depression of the release button. The lever can move freely to the left in the direction of view of Fig. 7, and the locking mechanism comes into operation, as can be seen in Fig. 8, where that discussed above Operating position of the locking mechanism is illustrated. When the operation of the shutter comes to an end is brought, there is a release of the lock button with respect to the pressure exerted by hand. Then the Lever 46 in the initial position under the force of spring 48 returned, and the lever is also turned back to the initial position. Here, the hook surface 49 ″ comes up the lever 49 engages the stop pin 54 on the lever 53) so that the lever 39 is locked and the shutter operating mechanism does not operate even if the lock button is pressed by hand as shown Fig. 9 shows where the aforementioned operating position of the locking mechanism is illustrated.

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On the other hand, the movable stop 61 is in the dash-dotted line Position according to Fig- 7 shifted when the PiIm is not being wound up straight.

When the handle 42 is carried out by hand in the aforementioned manner the film winding and shutter tensioning process of Hand is rotated, there is a rotation of the arm 53b of the L-shaped Lever 53 by engaging it with the release pin 58 so that the foremost part of the arm 53a on the L-shaped lever 53 is separated from its abutment contact with the end portion of the flange 40 'and the lever 40 and the lever 53 in the Position of FIG. 7 is returned.

The shutter mechanism does not operate while the film is being rewound, while the release button succeeds g & cannot be pressed for the release process. The film winding process cannot be carried out as long as the lock button is hand-printed. That way you can accidental errors in the operation of the shutter mechanism, for example a double exposure, prevented in a positive manner will. The shutter mechanism according to the invention can be adapted to a complex camera for use is formed with a so-called removable film cassette.

Claims

009834/1254

Claims (4)

- 14- claims: 1. Shutter mechanism in a camera, characterized by a switch (S1) in effective assignment to a release lever (32), a switch (S2) in effective assignment to a mirror drive unit (31)> which is connected in parallel to the same, a transistorized control circuit (Fig. 3) for a rear membrane, wherein the switch (S1) and the switch (S2) are in series with a power source (E), one Switch (S3) in effective assignment to a front sealing membrane, which is parallel to a capacitor (C1) contained in the control circuit, the switch (S3) being operated simultaneously with the actuation of the front closure membrane is switched off, which causes a charging of the capacitor, a variable resistor (R1) in the Circuit of the capacitor, which is mechanically connected to a locking dial (37), and one in the control circuit used electromagnet (27), which is to be switched off to release the rear closure membrane, the switch-off time of the electromagnet and thus the actuation time of the rear membrane due to the changes in the capacitor charging time can be controlled, which in turn can be controlled by changing the resistance value of the variable resistance (R1) are adjustable. 2. Closure according to claim 1, characterized in that a rotatable member (gear 20), which is used to release the rear membrane (2) by means of a tensioned helical spring and the like is set in rotation "u" with a protruding feil (projection 21) is provided in effective assignment »u the electromagnet (27) to the rear membrane to be actuated by a stop lever (23) after a certain time has elapsed, for example since the actuation of the front one Closure membrane (1), wherein the projection (21) is provided with a beveled engagement surface (25) which with the 009834/1254 - 15 - Bring engaging part of the stop lever (23) into contact is, and that the engagement surface is acute (angle α in Fig. 5) with respect to the tangential direction of the rotatable member (gear 20) is formed, the stop lever relative to the rotatable member out of engagement with the inclined surface the projection of the rotatable member is radially displaceable. 3. Closure according to claim 1, characterized in that the rear closure membrane (2) along the outer TJmfangsflache a drum (hollow shaft 4) is slidably guided, the inside of which along outer peripheral surfaces during rotation of the drum is guided by tubular parts (39) formed with bearing members for a pair of belt wheels or rollers (7) are to take along a pair of straps (6) or ribbons in association with the front closure membrane (1), and that a spindle (4b) at each end on the pulleys or Rollers rotatably attached herewith and passed through the inside of the drum without mechanical contact with the inner surface of the Drum is guided. 4. A shutter according to any one of claims 1-3, characterized by a safety gear (41) associated with the film winding and shutter tensioning mechanism, an annular rib (44) formed on the upper surface of the gear and having a cut-out portion (45) is provided, a lever (46) which ^{can be brought into engagement with its one end (46 1} ) with the cut-out part and is assigned to a further lever (40) which is displaceable when a locking button is pressed, an L-shaped lever ( 53) and an L-shaped stop lever (49) in effective connection with the second-mentioned lever, one end of the L-shaped stop lever (49) being effectively connected to the second-mentioned lever (46), while the other end is connected to a Is to be brought into engagement release pin (58) which is attached to the upper surface of the gear ο 0 0 9 8 3 * 4 7 1 ~ 2 5 4