US3821757A - Camera having an electric shutter - Google Patents

Camera having an electric shutter Download PDF

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Publication number
US3821757A
US3821757A US00234932A US23493272A US3821757A US 3821757 A US3821757 A US 3821757A US 00234932 A US00234932 A US 00234932A US 23493272 A US23493272 A US 23493272A US 3821757 A US3821757 A US 3821757A
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Prior art keywords
exposure
lever
locking
shutter
mechanical
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Expired - Lifetime
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US00234932A
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English (en)
Inventor
T Kobori
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Minolta Co Ltd
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Minolta Co Ltd
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Priority claimed from JP5390271A external-priority patent/JPS5610608B1/ja
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B19/00—Cameras
    • G03B19/02—Still-picture cameras
    • G03B19/12—Reflex cameras with single objective and a movable reflector or a partly-transmitting mirror
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B7/00—Control of exposure by setting shutters, diaphragms or filters, separately or conjointly
    • G03B7/08—Control effected solely on the basis of the response, to the intensity of the light received by the camera, of a built-in light-sensitive device
    • G03B7/081—Analogue circuits
    • G03B7/083—Analogue circuits for control of exposure time
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B9/00—Exposure-making shutters; Diaphragms
    • G03B9/58—Means for varying duration of "open" period of shutter

Definitions

  • a shutter control apparatus of the type having leading and trailing members which are biased to move from respective cocked positions to respective rest positions for respectively initiating and temiinating exposure includes apparatus for selecting either automatic electric exposure or mechanical exposure control.
  • the apparatus includes means for retaining the trailing member at its cocked position and means'for moving the retaining structure to a retracted position when the leading member is moved from its cocked position to its rest position.
  • Structure is also provided for restraining the retaining structure in its operating position and an electrical timing circuit controls the time period during which the restraining structure is operative.
  • Locking structure locks the retaining structure in its retaining position and is released by a device which is responsive to the movement of the leading member vfrom its cocked position to its rest position. The locking structure is maintained in an inoperative position when the apparatus is set to any one of a number of automatic exposure setting positions.
  • the shutter control apparatus also is capable of carryingout bulb exposures either using a combined mechanical and electrical exposure control, or in a modified embodiment. the bulb exposure is completely effected by mechanical mechanism only.
  • the presentinvention relates to camera types which are provided with an'electric shutter capable of setting automatic or manual exposure time by means of an electromagnet actuated by the output of an electric exposure control circuit.
  • a mechanical shutter speed control mechanism is operated independently of the electric exposure control circuit, and there is also a mechanism which is additionally capable of controlling the bulb exposure, whereby, the exposure time can be selectably controlled by either electrical or mechanical means by means of a selection member.
  • Electric shutters have been widely used because of the advantageous features that the exposure time thereof can be. automatically controlled, that they are mechanically durable against vibrations or the like, and that the accuracy of the shutter speed control is high. Nevertheless, they have the disadvantage that, when their power source cells are consumed, then shutter speed controlling accuracy is rapidly degraded such that in the'worst case, for instance, in the case where the shutter is closed by an excited electromagnet, the
  • the present invention comprises a shutter speed setting member operable as a selection member which is selectively shiftable to an automatic and manual exposure time setting position electrically controlling the shutter, or to a mechanical shutter speed position.
  • a mechanical exposure control locking member is operated by a member responsive to shutter opening motion and controls a shutter closing motion acting member.
  • the shutter closing motion acting member which is controlled either by the operation of an electromagnet or by the mechanical exposure control locking member corresponding to the shutter speed setting in accordance with either the automatic or manual exposure control by means of the electric control circuit or the mechanical control mechanism.
  • the mechanical shutter control device is advantageous in that the control can'be carried into effect merely by the change-over of a single shutter speed settingtmember, if a simple mechanism is added to the mechanism'which is used in the electrical control apparatus.
  • the present invention further provides various means for mechanically regulating the shutter speed of the mechanical shutter control device.
  • the mechanical exposure control locking member and the shutter closing motion acting member are respectively shaped into a novel and unique form in order that they are individually operable appropriately in response to the electrical control and to the mechanical control.
  • a bulb exposure control in a camera having an electric shutter, not only the mechanical control as described above can be carried out but also a bulb exposure control can be additionally carried into effect.
  • a position for the bulb exposure control is provided on the shutter speed setting member, and by adding a bulb locking member thereto in the mechanical mechanism, and further by selecting either the mechanical exposure control time or the electric exposure control time by the mechanical and electrical mechanisms, the bulb exposure control can be simply carried into effect.
  • FIG. l is a perspective view showing a first embodimentof a camera having an electric shutter in accordance with the present invention for obtaining mechan ical shutter speed control
  • FIG. 2 is a circuit diagram showing an electric exposure control circuit illustrating the operation of the present invention
  • FIG. 3 is a perspective view showing a second embodiment of the present invention in which a portion of the first embodiment shown in FIG. 1 has been modified
  • FIG. 4 is a perspective view showing a third embodiment of the present invention in which a part of the embodiment shown in FIG. I has been modified
  • FIG. 5 is a perspective view showing a fourth embodiment of a camera having en electric shutter in accordance with the present invention, wherein, the mechanical shutter speed control and the bulb exposure control can be both carried into effect,
  • FIG. 6 is a perspective view showing a fifth embodiment of the present invention in which a part of the fourth embodiment shown in FIG. has been modified.
  • FIG. 7 is a detail view of the locking lever structure of FIG. 6.
  • FIG. 1 shows a first embodiment of the invention, in which the electric circuit for controlling automatic or manual exposure time and the curtain shutter section shown in the lower part below the chain line Z Z are constructed in'accordance with a known electrically controlled curtain shutter.
  • the reference numeral 1 denotes a shutter release member which is biased by a spring (notshown in the drawing) to a'raised position, and the lower end of shutter release member 1 is in contact with transmital plate 2 having transmital rod 3.
  • the lower end of transmital rod 3 is in contact with one end of lever 4, and other end of the lever 4 is kept in contact with another lever 5 which is biased to turn about axis 5a in the clockwise direction W
  • the lever S engages through a lever 7, lever 8 which is biased in the counterclockwise direction W and lever 8 is pivotally mounted to one end of a'spindle 9 on which mirror 10 is rigidly mounted.
  • the lever 8 is engageable with a lever 11 which is in turn engaged with an opening curtain locking lever 12, and a pawl 12a is engaged with a cam 13 which is fixed to the lower end of a spindle 14.
  • the spindle 14 is provided with a switch operating piece 17 which opens a trigger switch S in an electric control circuit at the time when the spindle 14 starts to turn.
  • the trigger switch S is provided across delay capacitor C in the exposure time control circuit shown inFIG. 2.
  • the numeral 18 denotes a closing curtain operating lever which is switched, in the case where the electric control circuit for the automatic or manual exposure time shown in FIG. 2 is used, to contact b connecting a light receiving photoconductive cell R, with the capacitor C through a change-over switch S when the automatic exposure time is set as is well known, and is switched to contacts (1,, a a etc. connecting variable resistors R R R etc. with the capacitor C through the change-over switch S when the manual exposure time is set.
  • a switch S in FIG. 2 is a setting switch which is connected in series with a power source switch S and which is closed in relation to the depression of the release button. Setting switch S is kept closed when a shutter speed setting dial 28 described hereinafter is set for electric exposure control.
  • an arm portion 18b is kept engaged with a pin 20a erected on a gear 20 so as to lock the closing curtain 22 against its running-out tendency.
  • the electromagnet M is demagnetized and the closing curtain operating lever 18 is clockwise turned by spring 19. Closing curtain 22 is unlocked so as to movement of the closing curtain to be started.
  • the numeral 28 denotes a shutter speed setting dial, and on the top face thereof are provided three types of scales which include an electrical automatic exposure control scale B, an electric manual exposure control scale m consisting of such numerals as 30, 60, 125, 250, etc., and a mechanical exposure time control scale X. Also, provided bodily and coaxially with the shutter speed setting dial 28 is a setting cam plate 30 having a concave segment 30b and a pin 30a which controls the open and closing motion of the setting switch S in the exposure control circuit. When the scale E or any one of numerals of the scale m on the shutter speed setting dial 28 is brought coincident with an index 29, the pin 30a on the setting cam plate 30 is disengaged from the setting switch S so that the switch is closed.
  • Concave segment 30b is also kept disengaged from a pin 310 provided on a mechanical exposure control locking lever 31 which is endowed with a clockwise turning tendency by spring 39.
  • the mechanical exposure control locking lever 31 having a clockwise turning tendency due to the spring 39, is turned clockwise until the pin 31a erected thereon is brought into engagement with concave segment 30b of the setting cam plate 30.
  • Locking arm 31b of the locking lever 31 is thereby turned against the bias of the spring 19 until it is engaged with a pin 18a erected on the closing curtain operating lever 18 which is then located at a position arresting the closing curtain from its being released.
  • a winding lever 34 is turned counterclockwise in order to cock the shutter, the opening curtain gear 15 is rotated clockwise via gears 35, 36, 37 and 38, and opening curtain 21 is accordingly cocked through the gear 16. Since a connection pin 2%, formed on the under face of the closing curtain gear 20, is then pushed by a connection pin 15a, formed on the upper face of the opening curtain gear 15, the closing curtain gear 20 is also rotated so that the closing curtain 22 is also charged simultaneously.
  • Toothed portion 310 formed on one end of the mechanical exposure control locking lever 31 is meshed with a gear 32 fixed on the shaft of an inertia wheel 32a. Consequently, in the operation of closing curtain 22 when the shutter speed is mechanically controlled, the pin 15a on the gear 15 rotated counterclockwise together with the opening motion of the opening curtain 21 is going to escape from the pin 2012 on the closing curtain gear 20, and closing curtain gear 20 is thereby going to turn counterclockwise as does opening curtain gear 15.
  • the pin 18a at one end of the closing curtain operating lever 18 is kept in contact with the mechanical exposure control lever 31 having a clockwise turning tendency, and the inertia wheel 32a is interlocked via the gear 32 with the end portion of the lever 31. Therefore, the turning tendency of the gear as aforesaid is appropriately braked by the inertia wheel 32a in such a manner that the pin 20a is disengaged from the arm portion 1812 when a certain definite time has passedafter the opening curtain 21 was released. Because of this operation, the running motion of the closing curtain is started after a definite delay time and the shutter is thereby closed.
  • the first embodiment of the present invention operates as described hereinbelow.
  • the radially larger segment of the setting cam plate pushes aside the operating pin 31a of the mechanical exposure control locking lever 31 in the counterclockwise direction against the clockwise turning tendency due to the spring 39.
  • locking arm 31b isdisengaged from the pin 18a of the closing curtain operating lever 18.
  • the setting switch S is not engaged with the pin 30a of the setting cam plate 30, and therefore is kept closed, the operating condition of the exposure control circuit is maintained.
  • the charging of capacitor C in the circuit shown in FIG. 2 is commenced selectively via either the photoconductive cell R or one of resistors R R R etc., and that selection is accomplished by the changeover switch S
  • the electromagnet M is demagnetized so as to allow the closing curtain operating lever 18 and armature 24, which has been retained by electromagnet M to be turned clockwise by the bias of the spring 19.
  • the pin 20a formed on the closing curtain gear 20 is disengaged from the arm portion 18b of the closing curtain operating lever 18', thereby, the closing curtain gear 20, which is idly fitted on the spindle 14, allows the shutter closing curtain 22 to commence running.
  • the shutter can be thereby closed corresponding to the brightness of any object field or the setting of any exposure time.
  • the scale X of the shutter speed setting dial 28 must be brought coincident with the index 29.
  • the setting switch S in the exposure control circuit is opened by the pin 30a of the setting cam plate 30, the circuit is not operable. But opmatic control or the manual setting.
  • the connection pin 15a of the opening curtain gear 15 is retracted from the connection pin 20b of the closing curtain gear 21), thereby the closing curtain gear 20 is also free to rotate counterclockwise as is gear 15.
  • the inertia wheel 32a is interlocked with the closing curtain operating lever 18 via the mechanical exposure control locking lever 31, therefore,
  • Closing curtain gear 20 is thereby rotated so as to allow the closing curtain 22 to move.
  • FIG. 3 illustrates the second embodiment of the present invention. The operation thereof in the case of the automatic control or the manual setting is thoroughly similar to that of the first embodiment.
  • an inertia wheel as is used in the first embodiment is not provided therein, that mechanism is constructed such that, when the mechanical exposure control locking lever 31 is turned counterclockwise, edge 31b and pin 18a produce a frictional resistance.
  • the clockwise turning of the closing curtain operating lever 18 is realized at the moment after a definite time has passed subsequent to the opening of opening curtain 21 by operations such as the bias of the spring 39 which forces the mechanical exposure con trol locking lever 31 to turn clockwise, the frictional resistance generated between the pin 18a and one edge of the arm portion 31b, and the like. Consequently, the closing curtain is released after a definite delay time from the release of the opening curtain.
  • FIG. 4 illustrates the third embodiment of the present invention which is similar to that shown in FIG. 3 wherein the shutter speed is mechanically controlled.
  • the mechanical exposure control locking lever 31 is formed as an inertia weight, and thus, when the opening curtain 21 is released, the closing curtain gear 20 is also counterclockwise rotated simultaneously with the rotation of the opening curtain gear 15. Pin 20a tends to be disengaged from the arm portion 18b of the closing curtain operating lever 18.
  • FIG. illustrates the fourth embodiment of the present invention, wherein, a shutter release member 101, movable vertically with respect to the main body of the camera, is biased to a raised position.
  • Operative slant surface 101a is formed on the side face of the shutter release member 101, which is interlocked with a starting motion locking lever 102 via a mechanism such as, for example, a lever system 2 through 11 shown in FIG. 1.
  • the starting motion locking lever 102 is pivotally mounted to the camera body and biased with a clockwise turning tendency.
  • control plate 103 is turned counterclockwise interlocking with the shutter winding operation against the bias of spring 104, one end portion 102a of the starting motion lockinglever 102 is engaged with claw 103s of the control plate 103.
  • the starting motion locking lever 102 is turned counterclockwise interlocking with the depressed movement of the shutter release member 101, so that the control plate 103 is disengaged from the starting locking lever 102 and clockwise turned about an axle A by the bias of the spring 104.
  • the control plate 103 is also provided with, operating arm 103a having a pin l03b protruding thereunder, angled arm 1030 engagedwith a drive lever 110 which will be described hereinlater, and cocking arm 103d.
  • Pin 103b is engaged with a fork portion l08b of a switch lever 108, and a sliding contact 108a is formed on the other arm of the switch lever 108.
  • the switch lever 108 is engaged with engaging pin 105a protruding from opening curtain locking lever 105, and lug 105b, formed on another arm of the opening curtain locking lever 105, is engageable, in the cocked condition ofthe shutter, with a click portion 106!) of a cam plate 106a which is fixed to the opening curtain spindle 106.
  • Sliding contact 108a is kept in sliding contact with pring base plate 109.
  • An opening curtain 107 is fixed to and wound on the opening curtain spindle 106.
  • the print base plate 109 is made of a conductive material and an insulator face 109a is printed on the top surface thereof. Accordingly, when the control plate 103 is turned clockwise so as to have the switch lever 108 turned counterclockwise, the sliding contact 108a is shifted from the conductive face of the print base plate 109 to the insulator face 109a.
  • a well known trigger switch S (FIG. 2) in parallel with a delay capacitor C of the electric exposure control circuit is thereby opened so as to permit the timing circuit to commence its delaying operation.
  • Electromagnet M is demagnetized due to the reversal of the switching circuit after a certain definite time has passed.
  • the drive lever 110 engaged with angled arm 1036 of the control plate 103 is composed of a sleeve 110a fitted on the axle A and two levers 110k and 1100 which are formed respectively on the upper and lower ends of the sleeve 110a.
  • a cut-out portion of the lower lever 110a is engaged with angled arm 103C, and drive pin 110d is projected upwardly from the upper lever 11%.
  • Drive lever 110 is biased with a clockwise turning tendency by spring 112 which is bridged between the drive pin 110a and the camera body.
  • Closing curtain operating lever 111 is pivotally supported on the axle A and provided with an armature 113 fixed to a pin 111b on one end thereof, and also is provided with an engaging claw 1110 on the other end thereof. Armature 113 confronts electromagnet M in the electric exposure control circuit, and the engaging claw lllc is engageable with a mechanical exposure control locking lever 119 which will be described hereinafter.
  • Side face 111d of the closing curtain operating lever 111 is kept engaged with a pin 114a of the closing curtain locking lever 114 which is pivotally supported to the camera body.
  • Closing curtain locking lever 114 is provided with pin 114a on one end thereof.
  • the shutter speed setting member comprises a shutter speed setting dial 120 and a setting cam plate 121 bodily and coaxially constructed with the dial 120 and having a concave segment 121a provided thereon.
  • Dial 120 is provided with four types of scales arranged on the upper surface thereof so as to confront index 125.
  • the scales comprising automatic exposure time control scale E, a manual exposure time setting scale m which includes a plurality of numerals 1, 2, 4, etc., a mechanical exposure time control scale X, and a bulb scale B.
  • Contact 1211b is projected from setting cam plate 121 so that, in the case where the shutter is electrically controlled by the automatic or manual exposure time setting, and in the case where it is controlled by the bulb exposure setting, the change-over switch S of the electric control circuit as shown in FIG. 2 is thereby made operative.
  • the setting switch S of the electric exposure control circuit is opened as shown in FIG. 1, and an operating toucher 119a, provided on the mechanical exposure control locking lever 119 which is biased with a clockwise turning tendency by spring 122, enters concave segment 121a of the setting cam plate 121.
  • the mechanical exposure control locking lever 119 is also provided with fork-shaped arms consisting of a locking arm 11% and an unlocking arm 1190, and one of the side faces of the locking arm 11% is in contact with slant face 101a of the shutter release member 101.
  • the extreme end of the locking arm 11% is engageable with the engaging claw lllc of the closing curtain operating lever 111 at the time when the locking lever 119 is turned clockwise.
  • Unlocking arm 1190 is then engaged with unlocking cam 124 fixed on the top end of opening curtain spindle 106.
  • a click member 1240 of the unlocking cam 124 is engaged with the unlocking arm 1l9c, the mechanical exposure control locking lever 119 is counterclockwise turned against the bias of aspring' 122 (not shown), thereby, the engaging claw 1110 is disengaged from the locking arm 11%.
  • the contact 121b constituting the change-over switch 8; comes into contact with a contact capable of carrying out the highest or next highest speed exposure control.
  • the high speed exposure can be controlled by means of the electric exposure control circuit.
  • the operation thereof is once interrupted by the mechanical exposure control, and the mechanical exposure control is thereafter made operative.
  • a projection 117a is formed on winding gear 117 which is necessary for film winding and shutter cocking.
  • winding gear 117 When winding gear 117 is rotated clockwise, the projection 1170 is engaged with cocking arm 103a and pushes the control plate 103 to be rotated counterclockwise against the bias of a spring 104 until the claw 103e thereof is engaged with the starting motion locking lever 102.
  • the scale E or any one of numerals of the scale m on the shutter speed setting dial 120 is first of all brought coincident with the index 120.
  • the radially large segment of the setting cam plate 121 pushes the operating arm 119a of the mechanical exposure control locking lever 11 9 counterclockwise against the bias of the spring 122.
  • locking lever 119 is released from engagement with the slant face 101a of the release member 101 by the release of locking arm with claw 1110.
  • unlocking arm 11% is separated from the turning radius of the unlocking cam 124.
  • the settingswitch S is closed by the contact 121b, so that the electric exposure control circuit is made operable.
  • the sliding contact 108a is shifted from the conductive face of base plate 109 to insulated face 109a, and trigger switch (S in FIG. 2) is thereby opened and the electric exposure control circuit is accordingly started. Consequently, even though the control plate 103 is turned clockwise as described above, and angled arm 103a is released from engagement with drive lever 110, the drive lever 1110 is not rotated be cause the closing curtain operating lever 111 is kept stationary regardless of the bias of the spring 112 by virtue of the magnetized electromagnet M which holds the armature 113 stationary.
  • the closing curtain operating lever 111 is turned clockwise together with the drive lever pulled by the bias of the spring 112. Thereby, the side face 111d forces the closing curtain locking lever 114 to be turned clockwise, so that the closing curtain 116 starts to run, and the shutter is accordingly closed.
  • the scale X of the shutter speed setting dial 120 is brought coincident with the index 125.
  • the electric exposure control circuit is not operable, because the setting switch S (refer to FIG. 1 and FIG. 2) of the circuit is then opened by the contact 121b of the setting cam plate 121.
  • Operating arm 119a of the mechanical exposure control locking lever 119 moves into the concave segment 121a
  • mechanical exposure control locking lever 119 is turned clockwise so as to permit the locking arm 1119b thereof to come into contact with the slant face 101a of the release member 101.
  • the clockwise rotation of the locking lever 119 by the bias of the spring 122 being obstructed by its contact with the slant face 101a.
  • the closing curtain operating lever 111 is locked by its engagement with the locking arm 11% therefore, even though angled arm 1030 releases drive lever 110, the clockwise turning of the operating lever 111 by the bias of the spring 112 is still restrained by the locking arm 11%.
  • the exposure time in this case is determined by the time from the start of the unlocking of cam 124 to the moment when click member 124a pushes the unlocking arm 11%, which time is, determined by the initialv location of the click member 124a.
  • the speed is set at one-sixtieth seconds which is available for both flash photography and
  • the drive lever 110 is turned counterclockwise by angled arm 1030 against the bias of the spring 112, so that the closing curtain operating lever 111 is turned to the position where the armature 113, fixed to the closing curtain operating lever 111, comes into contact with the electromagnet M.
  • the apparatus is as shown in FIG. 5, which is a completed condition ready for the subsequent photographing.
  • the scale B of the shutter speed setting dial 120 is aligned with index 125, thereby the setting switch S (FIG. 2) of the electric exposure control circuit is closed by the contact l21b.
  • the variable resistance of the electric exposure control circuit is concurrently set at a time, for instance, at one-thirty seconds which is longer than the mechanical exposure control time, for example, one-sixty seconds, and the operating arm 1190 faces concave segment 121a of the setting cam 121.
  • the closing curtain operating lever 111 and the drive lever 110 are two separate members, it is however apparent that both members can be constructed as one body,
  • FIG. 6 shows the fifth embodiment of the present invention which is a modification of the fourth embodiment shown in FIG. 5.
  • the bulb exposure is completely effected by mechanical means only.
  • Concave segment 221a corresponding to the mechanical exposure time control and another concave segment 2211c corresponding to the bulb exposure, the latter concave segment being deeper than the former concave segment, are formed on setting cam 221.
  • An operating toucher 126a engageable with the setting cam 221 is integrally formed by shaft 126C and bulb exposure locking lever 126.
  • Formed on the extreme end of the bulb locking lever 126 is a locking arm l26b on which angled arm 126d is located at a position where a slant face 101a of a release member 101 comes into contact with the locking arm 126b.
  • a mechanical exposure control locking lever 127 is rotatably fitted onto shaft 126a on top of the bulb exposure locking lever 126, and is biased by means of a spring or the like not shown in the drawing so that its edge is kept in contact with angled arm 126d.
  • the mechanical exposure control locking lever 127 is shaped in a fork-like form consisting of a locking arm l27b and an unlocking arm 1270 which confronts unlocking cam 124 fixed to the opening curtain-spindle 106.
  • the engaging claw lllc on the extreme end of the closing curtain operating lever 111 is engageable with locking arms 126b and 1271).
  • locking arms 1261) and 127! are both located at a position spaced from the engaging claw 1110 because of the operating toucher 126a which is brought into contact with the radially large segment of the cam plate 221.
  • the scale X of the shutter speed setting dial 120 is brought coincident with the index 125, accordingly, the operating toucher 126a moves into the concave segment 221a of the setting cam plate 221, and bulb exposure locking lever 126 is thereby turned clockwise until its angled arm 1260' comes into contact with the slant face 1111a.
  • the opening curtain spindle 106 is rotated so as to have the shutter opened similarly as in the case of the fourth embodiment, and at the moment when the unlocking arm 1270 is pushed by the click member 124a, the engaging claw lllc is unlocked from the locking arm 1271) so as to allow the closing curtain opexposure control circuit is opened to render the 'circuit non-operable as compared to the fourth embodiment shown in FIG. 5.
  • the operating toucher 126a confronts concave segment 2210 which is deeper than the concave segment 221a.
  • the closing curtain operating lever 111 and the drive lever 111) are two separate members, but these members can be formed into one body similar to the fourth embodiment as described above.
  • the locking arms 126band 1127b can be arranged so that both are engaged with and disengaged from the drive lever 1111 with the identical relationship therebetween with that described above.
  • Shutter control apparatus for a camera having a leading member biased to move from a cocked position to a rest position for initiating exposure and a trailing I member biased to move from a cocked position to a rest position for terminating the exposure, and wherein said trailing member is restrained in the cocked position with said leading member in the cocked position, comprising:
  • a manual member settable to at least any one of a number of electrical exposure setting positions and a mechanical exposure position
  • said means for locking including a second rotatable lever rotated for engagement with said locking lever, said second locking lever including said means for engaging with said responsive means, and said first and second rotatable levers are engaged with said locking lever with said means for selecting set to said bulb exposure position.
  • Shutter control apparatus as in claim 2 wherein one position of said multi-position switch provides a time delay greater than the time delay provided by said timing cam.
  • Shutter control apparatus as in claim 2 wherein said manual member is also settable to a bulb exposure position. a position of said multi-position switch provides a time delay with said manual member at said bulb exposure position greater than the time delay of said timing cam, said means for locking is operative with the release of said locking lever by said rotatable timing cam, and said means for restraining further includes means for reengaging said arm with said locking lever whereby said means for locking is operative with said electric circuit actuated, and said arm is disengaged from said locking lever with the return of the camera shutter release member to initiate. closing of said trailing member.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Shutters For Cameras (AREA)
  • Shutter-Related Mechanisms (AREA)
US00234932A 1971-03-17 1972-03-15 Camera having an electric shutter Expired - Lifetime US3821757A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP1803571 1971-03-17
JP5390271A JPS5610608B1 (de) 1971-07-21 1971-07-21

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US3821757A true US3821757A (en) 1974-06-28

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US00234932A Expired - Lifetime US3821757A (en) 1971-03-17 1972-03-15 Camera having an electric shutter

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3930263A (en) * 1973-08-27 1975-12-30 Asahi Optical Co Ltd Camera having a shutter mechanism controlled to remain closed as a failure warning
US3990089A (en) * 1974-11-02 1976-11-02 Asahi Kogaku Kogyo Kabushiki Kaisha Camera shutter multi-mode controller providing in one mode a power-saving interval
US3990086A (en) * 1973-05-15 1976-11-02 Asahi Kogaku Kogyo Kabushiki Kaisha Shutter control circuit for cameras
US4024553A (en) * 1974-06-06 1977-05-17 Olympus Optical Co., Ltd. Electrical focal plane shutter with mechanical control mechanism operative upon electromagnetic failure
US4051498A (en) * 1969-12-16 1977-09-27 Seiko Koki Kabushiki Kaisha Camera electric shutter with mechanical delay device
US4053913A (en) * 1975-04-19 1977-10-11 Nippon Kogaku K.K. Electric shutter device for a focal plane shutter
US4099195A (en) * 1974-12-27 1978-07-04 Asahi Kogaku Kogyo Kabushiki Kaisha Camera having automatic and manual exposure-time determination
US4268152A (en) * 1978-12-28 1981-05-19 Canon Kabushiki Kaisha Bulb photography control system for camera

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5848887B2 (ja) * 1975-05-21 1983-10-31 アサヒコウガクコウギヨウ カブシキガイシヤ 後幕係止部材の係止位置復帰機構

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3303766A (en) * 1964-04-28 1967-02-14 Asahi Optical Co Ltd Camera shutter arrangement responsive to both photoelectric and mechanical time control systems
DE1919670A1 (de) * 1968-07-26 1970-02-26 Asahi Optical Co Ltd Verschlusssteuerung fuer photographische Kameras

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4051498A (en) * 1969-12-16 1977-09-27 Seiko Koki Kabushiki Kaisha Camera electric shutter with mechanical delay device
US3990086A (en) * 1973-05-15 1976-11-02 Asahi Kogaku Kogyo Kabushiki Kaisha Shutter control circuit for cameras
US3930263A (en) * 1973-08-27 1975-12-30 Asahi Optical Co Ltd Camera having a shutter mechanism controlled to remain closed as a failure warning
US4024553A (en) * 1974-06-06 1977-05-17 Olympus Optical Co., Ltd. Electrical focal plane shutter with mechanical control mechanism operative upon electromagnetic failure
US3990089A (en) * 1974-11-02 1976-11-02 Asahi Kogaku Kogyo Kabushiki Kaisha Camera shutter multi-mode controller providing in one mode a power-saving interval
US4099195A (en) * 1974-12-27 1978-07-04 Asahi Kogaku Kogyo Kabushiki Kaisha Camera having automatic and manual exposure-time determination
US4053913A (en) * 1975-04-19 1977-10-11 Nippon Kogaku K.K. Electric shutter device for a focal plane shutter
US4268152A (en) * 1978-12-28 1981-05-19 Canon Kabushiki Kaisha Bulb photography control system for camera

Also Published As

Publication number Publication date
DE2212673C2 (de) 1984-04-26
DE2212673A1 (de) 1972-10-12

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