WO2008034439A2 - Spiegelantrieb für eine kamera - Google Patents
Spiegelantrieb für eine kamera Download PDFInfo
- Publication number
- WO2008034439A2 WO2008034439A2 PCT/DE2007/001732 DE2007001732W WO2008034439A2 WO 2008034439 A2 WO2008034439 A2 WO 2008034439A2 DE 2007001732 W DE2007001732 W DE 2007001732W WO 2008034439 A2 WO2008034439 A2 WO 2008034439A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- mirror
- coil
- magnet system
- drive according
- mirror drive
- Prior art date
Links
Classifications
-
- 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
Definitions
- the invention relates to a mirror drive for a camera, in particular medium format camera.
- SLR cameras are known to be constructed so that the beam path from the lens falls directly onto the surface to be exposed in the form of an exposable film, a digital sensor o.
- the exposure time is controlled in the usual way by a shutter.
- the optical path to the photosensitive sensor or film is shut off with an auxiliary shutter and then folded a mirror with which the targeted by the lens motif for performing a viewfinder function is deflected so that in a cubic housing, the viewfinder on the top or on the Side wall of the housing can be arranged.
- the auxiliary shutter In the rest position, the auxiliary shutter is unfolded to prevent passage of light to the photosensitive receiving member.
- the mirror is folded into the beam path in order to be able to use the viewfinder function to aim the desired object through the objective.
- a shutter button is pressed. Apart from the shutter control takes place for the parts of interest here, namely the auxiliary shutter and the mirror, a defined sequence instead.
- the mirror is folded up. Once this has been done, the auxiliary shutter is also folded away, so that - apart from the exposure shutter - the beam path from the lens to the photosensitive receiving part is free. After the exposure for the recording, the auxiliary shutter is first folded back into the beam path and then the mirror pivoted back to its original position to enable the viewfinder function again.
- the present invention has for its object to make thedocsab- run for the pivoting of the auxiliary shutter and the mirror when triggering a recording with a simplified arrangement with fewer items feasible and so reduce the cost of the mirror drive.
- the mirror drive according to the invention is formed with a motor with a coil and a magnet system, in which the auxiliary shutter with the coil and the mirror is directly coupled to the magnet system.
- a motor formed of a coil and a magnet system is known.
- the current flow through the coil creates a magnetic field which interacts with the magnetic field of the magnet system and, depending on the flow direction of the current flowing through the coil, produces a force. right to the field and current direction generated in both directions.
- the magnet system with the mirror and the auxiliary shutter with the coil to form a direct drive is directly coupled.
- the current flow through the coil leads to a relative movement of the coil in the magnet system.
- the auxiliary shutter is movable when the magnet system is fixed. Since the magnet system is directly coupled to the mirror for direct drive, in another phase the magnet system is moved relative to the coil, with the coil fixed to allow movement for direct drive of the mirror.
- the magnet system and the coil are pivotally mounted about the same pivot point. Consequently, both the magnet system and the coil perform a pivoting movement about this pivot point.
- the magnet system and the coil are provided with control arms, one of which is coupled to the mirror and the other with the auxiliary shutter.
- the current direction is reversed by the coil and held the coil or the magnetic system in order to realize the required relative movement.
- the detention of the magnet system or of the coil or of the associated control arm associated with the magnet system or the coil is preferably effected by a moving control element whose movement is caused by the movement of the control arms by means of entrainment elements and control sections.
- the control is preferably rotatable back and forth by a limited angle of rotation.
- the control arms may preferably be designed as two-armed levers whose pivot point coincides with the pivot point of the bearing of the magnet system or the coil and beyond the pivot point has a slot guide for engaging in the slot associated pin, wherein the pin is attached to an actuating arm, the is connected to the mirror or the auxiliary shutter to form the direct drive.
- the mirror and the auxiliary shutter in an initial position are pivoted into the direct beam path to allow the viewfinder function.
- the coil is first energized with current in a first current direction and the coil is held with the auxiliary shutter, so that the magnet system is pivoted relative to the coil and the mirror folds out of the beam path.
- the current direction is reversed by the coil and the magnet system is held in the assumed position together with the mirror, so that thereby the auxiliary shutter flap is pivoted out of the beam path.
- the coil with the auxiliary shutter is first pivoted by re-reversing the current direction in the first direction and by maintaining the detention of the magnet system with the mirror and then by re-reversing the current direction and holding the coil with the auxiliary shutter, the magnet system with the Mirror pivoted to the starting position.
- the magnet system is preferably controlled in the opposite direction, wherein the mass of the magnet system approximately corresponds to the mass of the mirror.
- momentum and weight compensation are carried out, since the movements of the approximately equal mass parts of the mirror and magnet system cancel each other out.
- the coil for pivoting the auxiliary shutter in one direction is controlled in the opposite direction, wherein the mass of the coil corresponds approximately to the mass of the auxiliary shutter.
- the mass of the auxiliary shutter is much smaller than the mass of the mirror.
- the movement of the control arms by means of light barriers and in the direction of movement successively arranged cam can be queried and influenced by controlling the current through the coil position-dependent. In this way, it can be achieved, for example, that at the end of the movement no jerky braking of the magnet system takes place, but at the end of the path, a gradual deceleration takes place, whereby the movement is much quieter executable.
- the dynamic behavior of the mirror stop can be influenced
- a further advantage is an arrangement of cams, which enables the detection of the two end positions.
- control arm connected to the magnet system is connected to a rotatably mounted actuating arm for the mirror via a slot-pin guide such that the pin in the slot in the slot in the transition from one end position of the magnet system into the other a back and forth Herbeweg performs and when the pin is additionally connected to the control arm via a spring which presses the mirror in two corresponding to the end positions of the magnet system defined positions.
- the spring is compressed by the forward movement until a maximum compression state is exceeded. Then the spring supports by their relaxation, the movement of the magnet system in the other end position.
- control arm connected to the coil is preferably also connected to a corresponding actuating arm of the auxiliary closure flap, wherein a corresponding bistable spring is provided, which ensures that the auxiliary closure flap assumes its completely open or completely closed end position.
- Figure 1 is a plan view of the mirror drive according to the invention, which is located in a side wall of the camera body;
- FIG. 2 shows a section with a sectional plane lying parallel to the side wall through the mirror drive
- Figure 3 is a perspective view of the (partially open) camera body with an attached shaft finder and, alternatively, with an attached prism viewfinder;
- Figure 4 is a view of the magnet system with the molded control arms, shown here in engagement with a pin of a
- Actuating arm which is rotatably connected to the mirror
- Figure 5 is a view of the magnet system with the control arms (without driven mirror) from below;
- Figure 6 is a view of the wound flat coil with molded actuating arms and attached connecting lines from above;
- Figure 7 is a view of the arrangement shown in Figure 6 from below;
- FIG. 8 shows a combination of the drive formed by the magnet system and the coil with the respective control arms, which acts on actuating arms of the mirror and the auxiliary closure flap, in an initial position in which the mirror and auxiliary closure flap are pivoted into the direct beam path;
- Figure 9 shows a first step in the triggering of a recording in which the magnet system is pivoted while held coil to pivot the mirror out of the beam path;
- Figure 10 shows a state after the execution of the next moving step, in which the coil is pivoted in the detained magnet system to pivot away the auxiliary shutter flap from the beam path.
- Figure 11 shows a state after a first movement step after performing a recording, with which the auxiliary shutter flap has been pivoted back into the beam path. By a subsequent pivoting of the magnet system, the initial state of Figure 8 is reached again.
- FIG. 1 shows a camera housing 1 of a medium-format camera with a front side 2, which serves to receive lenses (not shown).
- a bottom 3 has feet 4 for parking the camera on a ground.
- the functional rear wall can be formed for example by a film magazine or by a digital sensor.
- the housing is completed by (not shown) side walls, of which for the representation of Figure 1, a side wall is removed to release the view of a drive according to the invention.
- FIG. 1 shows behind the removed side wall a mounting plate 7 and a printed circuit board 8 held thereon.
- the drive assembly is separated by a wall 9 from the interior of the camera.
- the illustrated drive comprises a motor 10 in the form of a flat coil 11 wound in a trapezoidal shape and movable in a magnet system 12 between two positions.
- the coil is provided with a coil carrier 23 (FIG. 6), which is connected in one piece with a control arm arrangement 13.
- the control arm assembly is mounted at a pivot point 14, so that the coil 11 is pivotable about the pivot point 14.
- the magnet system 12 has, in a known manner, two pairs of opposing magnets of different polarity, so that a drive force is formed perpendicular to the field direction and to the current direction for both coil sections located in the air gap. If the current direction is reversed by the coil 11, the coil 11 moves in the opposite direction relative to the magnet system 12, whereby the two end positions of the coil 11 are achieved.
- the magnet system 12 is fixed in the region of the end positions by end caps 15.
- the magnet system 12 has a control arm assembly 16 which is also rotatably mounted about the pivot point 14.
- the control arm assembly 16 is formed integrally with the end pieces 15.
- the Steuerarman extract 13 of the coil 11 has a control arm 17, seen from the coil 11 from beyond the pivot point 14 at the free end a longitudinal slot 18 in which a mounted on a pivotable actuating lever 19 pin 20 is slidably held.
- the pivotable actuating lever 19 is non-rotatably connected to an auxiliary shutter flap (not shown) of the camera, with which the open rear side 5 can be closed off in a light-impermeable manner.
- the Steuerarman extract 16 of the magnet system 12 is connected to an actuating arm of the mirror of the camera, which is pivotally mounted and is articulated through an arcuate slot portion 21 in the mounting plate 7 and the wall 9 through the mirror.
- Figure 1 can still recognize a release button 22 at the bottom of the side wall, with a locking of the attached function wall 6 is detachable, so that, for example, a film magazine can be easily and quickly replaced by a digital back wall.
- the sectional view in Figure 2 is chosen so that the cutting plane passes through the winding of the coil 11 so that a coil carrier carrying the coil 23 is seen in section.
- the coil carrier 23 is provided with a circular arc-shaped slot 24 in which a pin 25 fixedly connected to the magnet system 12 is guided.
- the pin longitudinal slot arrangement 24, 25 thus limits the relative movement between coil 11 and magnet system 12, wherein the ends of the longitudinal slot 24 define the end positions.
- FIG. 2 shows that the control arm arrangement 13 of the spool 11 has an arcuate extension 26 which carries cams 27 arranged one behind the other in the longitudinal direction. These pass through a light barrier 28 as a function of the pivoting movement of the coil 11, so that the arrangement of light barrier 28 and cam 27 makes it possible to determine the momentary position of the coil 11 from one end position to the other.
- control arm assembly 16 of the magnet system 12 on an arcuate projection 29 which carries correspondingly arranged cam 30, which serve together with a light barrier 31 for determining the position of the pivotally mounted magnet system 12.
- FIGS. 1 and 2 further show a control disk 32 which is mounted about a central axis of rotation perpendicular to the disk plane and which is rotated in the one and the other direction by a certain angle of rotation due to the movement of the control arm arrangements 13, 16
- Control disk 32 with cams 33 and stored in their spring pins 34 is formed so that the desired sequence of movements, as described in more detail below, is met and, for example, a unwanted movement is blocked back to a previous phase of the expiration.
- Figure 3 shows the camera body, seen obliquely from the front.
- the top 35 of the camera body is provided with a viewfinder screen, so that on top of a viewfinder slot 36 or a prism searcher 37 can be placed, which allows the viewfinder function in the direction behind the camera.
- a lens with a bayonet lock can be used.
- Figures 4 and 5 show in a single representation, the magnet system 12 with the associated control arm assembly 16 and a coupled therewith actuator arm 39, which causes the pivoting movement of the mirror 40 of the SLR camera.
- the control arm assembly 16 extends from the arcuate magnet system 12 to a tapered portion 41 to the pivot point 14.
- the integrally formed control arm assembly 16 extends beyond the pivot 14 with a control arm 42 away from the magnet system 12.
- a longitudinal slot 43 which is open towards the free end.
- a pin 44 of the actuating lever 39 is guided.
- the actuating lever 39 is rotatably mounted on a rotation axis 45 on which the mirror 40 is pivotally mounted.
- the operating lever 39 has an arm portion 46 adjacent to and below the control arm 42, which has a through hole 47 through which a bolt 48 connected to the mirror 40 projects allowing angular adjustment between the operating lever 39 and the mirror 40.
- Figure 4 illustrates by the dashed line drawn 49, that the magnet system 12 is pivotable about the pivot point 14 by a certain angle.
- the control arm arrangement 16 has, viewed from the magnet system 12, the arcuate projection 29 at the end of a connecting arm 50 beyond the pivot point 14, whose radius of curvature corresponds to the distance of the projection 29 from the pivot point 14.
- the representation of the underside in Figure 5 illustrates that on the underside of the projection 29, the cams 30 are arranged, with which in cooperation with the light barrier 31, the instantaneous position of the magnet system 12 is detectable.
- Figures 6 and 7 show the item which comprises the bobbin 23, on which the coil 11 is wound, the control arm 17 with the arcuate projection 26 and another, cooperating with the control disk 32 control arm 51. Shown are furthermore two lines 52, via which the coil 11 can be supplied with power in the two different current directions.
- the view of the bottom in Figure 7 illustrates the position of the cam 27 on the arcuate projection 26. Further, bevels 53 with locking edges 54 can be seen, which cooperate with the spring pins 34 of the control disc to the locking of the control arm assembly 16 or 13 and the rotational movement of the Control disc 32 in conjunction with the cam 33 to effect.
- a leg spring 55 with two end arms 56, 57 is also mounted in the region of the pivot point 12. While one end arm 56 serves to support the coil spring, the other end arm 57 protrudes from the contour of the control arm assembly 13 and acts as a driver for the control arm assembly 16 of the magnet system 12.
- FIGS. 8 to 11 four phases of the control of the mirror and the auxiliary shutter in the tripping operation for taking an image are shown.
- Figure 8 shows the arrangement of magnetic system 12 with the associated control assembly 16, coil 11 with the associated control arm assembly 13 and the control disk 32, which controls the movement, in a first phase, which corresponds to the rest position of the camera.
- a viewfinder function is possible because the mirror 40 is pivoted into the beam path of the camera (from the front side 2 to the rear side 5).
- the auxiliary shutter flap is pivoted down so as to block the beam path from the front 2 to 5 back of the camera.
- the magnet system 12 is located in Figure 8 in an upwardly pivoted position. About the control arm 42, the actuating arm 39 is pivoted for the mirror down.
- the coil 11 is located relative to the magnet system 12 in a lower end position, which corresponds to the upper end position of the coil 11 with respect to the possible Verschwenkungswinkels the coil 11.
- the magnet system 12 moves downwards in its pivoting path, as shown in FIG the coil 11 remains unchanged. Accordingly, the mirror 40 is pivoted by the now pivoted upwardly actuating arm 39 upwards, so moved out of the direct beam path of the camera.
- the control arm arrangement 16 connected to the magnet system 12 runs at the end of this movement with a lug 16 'against the end arm 57 of the leg spring 55 and deflects it slightly, which is indicated by broken lines in FIG. indicates.
- the movement of the magnet system is slowed down shortly before reaching its end position and, on the other hand, the following movement of the coil 11, which is caused by a time-synchronized reversal of the current through the coil 11, is supported by an initial acceleration.
- the control disk 32 has been moved so that it now prevents the magnet system 12 from moving. By reversing the polarity of the current direction through the coil 11, this moves in the magnet system 12 downwards, whereby an associated with her actuator arm 58 is pivoted upward, as shown in Figure 10.
- the actuating arm is directly coupled to the auxiliary shutter, so that it is now also pivoted out of the beam path. As a result, the camera is ready for recording. The exposure is controlled in the usual way by the shutter of the camera.
- the spool 11 After carrying out the exposure, the spool 11 is moved upwardly in the magnet system 12 which is still held in place, as shown in FIG. As a result, the actuating arm 58 pivots down about its axis of rotation 59 so that the auxiliary shutter flap again blocks the beam path in the camera. Subsequently, the magnetic system 12 is shifted by reversing the polarity of the current direction in the coil 11 and holding the coil 11 upwards, whereby the mirror 40 is folded into the beam path and the starting position of Figure 8 is reached, in which a viewfinder function is possible.
- the end arm 57 of the leg spring 55 runs against the lug 16 'and is articulated slightly. As a result, the movement of the spool 11 is slowed down shortly before reaching its end position and at the same time gives the magnet system 12 an initial acceleration for the subsequent movement into the initial state.
- a U-shaped spring 60 is clamped between the control arm 17 and the pin 25 of the actuating arm 59, which pushes the pin 25 from the control arm 17. Since the actuating arm 58 extends on a circular path which intersects the circular path of the actuating arm and since the end positions of the actuating arm 58 shown in Figure 11 and Figure 10 causes a maximum distance of the pin 25 in the longitudinal slot 24, the spring 60 supports the correct assumption of the end positions the actuating arm 58 and thus the auxiliary shutter.
- a corresponding spring 61 is effective for the corresponding bistable control of the actuating arm 39 for the mirror 40, so that it is ensured by the spring 61 that the mirror 40 is always positioned correctly in its end positions.
- a similar function has a similar spring 62, which protrudes in Figures 9 and 11 under the control disk 32 and acting as a rocker control disk 32 each presses in one of its two end positions.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Cameras In General (AREA)
- Reciprocating, Oscillating Or Vibrating Motors (AREA)
- Studio Devices (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP07817574A EP2064593A2 (de) | 2006-09-21 | 2007-09-21 | Spiegelantrieb für eine kamera |
US12/442,412 US20100027984A1 (en) | 2006-09-21 | 2007-09-21 | Mirror drive for a camera |
DE112007002841T DE112007002841A5 (de) | 2006-09-21 | 2007-09-21 | Spiegelantrieb für eine Kamera |
JP2009528596A JP2010504542A (ja) | 2006-09-21 | 2007-09-21 | カメラ用のミラードライブ |
IL197457A IL197457A0 (en) | 2006-09-21 | 2009-03-08 | Mirror drive for a camera |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102006045599 | 2006-09-21 | ||
DE102006045599.1 | 2006-09-21 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2008034439A2 true WO2008034439A2 (de) | 2008-03-27 |
WO2008034439A3 WO2008034439A3 (de) | 2008-05-08 |
Family
ID=39106218
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE2007/001732 WO2008034439A2 (de) | 2006-09-21 | 2007-09-21 | Spiegelantrieb für eine kamera |
Country Status (7)
Country | Link |
---|---|
US (1) | US20100027984A1 (de) |
EP (1) | EP2064593A2 (de) |
JP (1) | JP2010504542A (de) |
CN (1) | CN101517478A (de) |
DE (1) | DE112007002841A5 (de) |
IL (1) | IL197457A0 (de) |
WO (1) | WO2008034439A2 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8796622B2 (en) * | 2007-09-06 | 2014-08-05 | Testo Ag | Thermal imaging camera comprising a cover plate |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2018189770A (ja) * | 2017-05-01 | 2018-11-29 | キヤノン株式会社 | 撮像装置 |
CN109491181B (zh) * | 2019-01-02 | 2024-03-19 | 昆山丘钛微电子科技股份有限公司 | 相机模组及其制造方法 |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS53127671A (en) * | 1977-04-13 | 1978-11-08 | Olympus Optical Co | Electromagnetic control device for operation of rotation |
JPS5655929A (en) * | 1979-10-15 | 1981-05-16 | Canon Inc | Camera having electromagnetic driving source |
JPS6488530A (en) * | 1987-09-30 | 1989-04-03 | Kyocera Corp | Mirror driving mechanism for camera |
US4839679A (en) * | 1987-06-18 | 1989-06-13 | General Electric Corp. | Dual voice coil shutter |
US6123466A (en) * | 1997-02-06 | 2000-09-26 | Victor Hasselblad Ab | Electromagnetic displacement means |
US20050238346A1 (en) * | 2004-04-23 | 2005-10-27 | Nikon Corporation | Electronic camera |
-
2007
- 2007-09-21 WO PCT/DE2007/001732 patent/WO2008034439A2/de active Application Filing
- 2007-09-21 DE DE112007002841T patent/DE112007002841A5/de not_active Withdrawn
- 2007-09-21 EP EP07817574A patent/EP2064593A2/de not_active Withdrawn
- 2007-09-21 CN CNA200780035167XA patent/CN101517478A/zh active Pending
- 2007-09-21 JP JP2009528596A patent/JP2010504542A/ja active Pending
- 2007-09-21 US US12/442,412 patent/US20100027984A1/en not_active Abandoned
-
2009
- 2009-03-08 IL IL197457A patent/IL197457A0/en unknown
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS53127671A (en) * | 1977-04-13 | 1978-11-08 | Olympus Optical Co | Electromagnetic control device for operation of rotation |
JPS5655929A (en) * | 1979-10-15 | 1981-05-16 | Canon Inc | Camera having electromagnetic driving source |
US4839679A (en) * | 1987-06-18 | 1989-06-13 | General Electric Corp. | Dual voice coil shutter |
JPS6488530A (en) * | 1987-09-30 | 1989-04-03 | Kyocera Corp | Mirror driving mechanism for camera |
US6123466A (en) * | 1997-02-06 | 2000-09-26 | Victor Hasselblad Ab | Electromagnetic displacement means |
US20050238346A1 (en) * | 2004-04-23 | 2005-10-27 | Nikon Corporation | Electronic camera |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8796622B2 (en) * | 2007-09-06 | 2014-08-05 | Testo Ag | Thermal imaging camera comprising a cover plate |
Also Published As
Publication number | Publication date |
---|---|
DE112007002841A5 (de) | 2009-09-10 |
IL197457A0 (en) | 2009-12-24 |
JP2010504542A (ja) | 2010-02-12 |
US20100027984A1 (en) | 2010-02-04 |
WO2008034439A3 (de) | 2008-05-08 |
EP2064593A2 (de) | 2009-06-03 |
CN101517478A (zh) | 2009-08-26 |
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