CN1080407A - The autofocus mechanism of camera - Google Patents
The autofocus mechanism of camera Download PDFInfo
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- CN1080407A CN1080407A CN 92104988 CN92104988A CN1080407A CN 1080407 A CN1080407 A CN 1080407A CN 92104988 CN92104988 CN 92104988 CN 92104988 A CN92104988 A CN 92104988A CN 1080407 A CN1080407 A CN 1080407A
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Abstract
The present invention relates to a kind of exploitation of autofocus mechanism, reduce mechanicalness interlinked mechanism wherein as far as possible, it is helped being installed in the camera and reduce production costs, and reduce the consumption of battery electric power, and can control closely focusing and remote focusing automatically.This mechanism be by can making the lens head move to the spring part of the location in focusing position closely and the remote focusing position, and makes lens in the one location move to his electromagnetic mechanism of location to constitute.In addition, electromagnetic mechanism is to do the initial stage action by the discharge current of capacitor, thereafter, accepts the battery supply electric current to continue action by the electric current limiting resistance.
Description
The present invention relates to the autofocus mechanism of a kind of use at compact camera.
Go up mutually at traditional minicomputer, the simple and easy autofocus mechanism that lens is moved is arranged at in-plant focusing position and on two positions of remote focusing position.
Be the structural map of the embodiment of this autofocus mechanism as shown in Figure 7, lens 11 receives the strength of turn left often owing to the effect of spring 12.And this lens 11 is because of its protruded arm 11a's so be subjected to trace 13 to push clockwise direction to rotate, and makes it be still in the position of touching electromagnetic mechanism 15 to the armature 14 that is located at protruded arm 11a as shown in the figure.
Said lens camera lens 11 is being positioned at the moving shown position of dextrorotation and to the direction of leaving egative film advance mobile (being the direction on the paper at Fig. 7), and become closely focusing position, and this lens 11 is moving revolving when running into retaining pin 16 in a left side, promptly becomes to retreat to move to form remote focusing position.
Though wherein trace 13 receives the left-handed strength that causes owing to spring 17, also with the pressing action interlock of release lever 18 and do the action of turn to the right.
The autofocus mechanism of above-mentioned camera, when selecting closely signal according to range-measuring circuit, electromagnetic mechanism 15 promptly can be excitatory and be held armature 14.
Therefore, as with 18 times press operations of release lever the time, promptly have and have only trace 13 turn to the right as shown in Figure 8,11 of lens remain on the closely focusing position that advances after moving, and shutter is action in this state then.
When selecting distant signal according to range-measuring circuit, 15 of electromagnetic mechanisms are kept non-excitatory state, and the result is owing to make trace 13 turn to the right, lens 11 turn as shown in Figure 9 and to the right during 18 times press operations of release lever.Therefore, lens 1 is just made shutter action at the remote focusing position that retreats after moving.
According to the autofocus mechanism of above-mentioned camera, its lens 11 will advance in rotation or retreat and move to focusing position, therefore must make the structure that can rotate freely to lens 11, and only this structure also just becomes complicated problems.
In addition since lens 11 mat traces 13 and with the structure of release lever 18 interlocks, therefore will become the mechanicalness interlinked mechanism that necessity such as comprising trace 13 or spring 17 is arranged, this moment, the structure of camera also just became complicated problem.
The present invention is because above-mentioned truth, and its purpose is to develop a kind ofly avoids mechanical interlinked mechanism and with the autofocus mechanism of the camera of driven by power lens 11.
In order to reach above-mentioned purpose, the present invention is in the 1st invention, photographic lens is moved in the 1st position of advancing and the 2nd position that retreats and make on the autofocus mechanism of focus to whole camera, proposal moves to the spring part of any one position of the 1st position or the 2nd position with photographic lens, and the distance measuring signal that satisfies certain condition makes corresponding action, and the photographic lens in a location is moved to the autofocus mechanism of the electromagnetic mechanism of the opposing party position as the camera of its feature.
In the 2nd invention of the present invention, proposal is to possess above-mentioned electromagnetic mechanism and to be located at the electric current limiting resistance of current supply circuit, and capacitor that can pre-charge, make electromagnetic mechanism just interim in action, discharge current by above-mentioned capacitor is driven, then by the power supply of electric current limiting resistance, and keep the automatic focusing mechanism of the formation of action owing to the electric current of battery supply as the camera of its feature.
In the common time, photographic lens is owing to the elastic force that is subjected to spring part moves to either party position of the 1st, the 2nd position, just at focusing position closely or at remote focusing position.
Therefore, electromagnetic mechanism can be in the photography of the position of above-mentioned photographic lens when non-action.
When electromagnetic mechanism when the distance measuring signal that satisfies certain condition is made corresponding action, photographic lens moves to the opposing party's position from an above-mentioned side's position, just move to remote focusing position, or move to closely focusing position from remote focusing position from focusing position closely.
Like this when electromagnetic mechanism moves, it will be subjected to the discharge current of capacitor and produce excitatory action and lens 11 is driven mobile, then, be subjected to the electric current of the battery supply that flow through by the electric current limiting resistance and continue excitatory action, to keep the shift position of photographic lens.
Fig. 1 is the sectional view of lens part of autofocus mechanism of the camera of the 1st embodiment of the present invention;
Fig. 2 is the front view (FV) of said lens camera lens;
Fig. 3 is the driving circuit figure of autofocus mechanism;
Fig. 4 is the lens sectional view partly of the autofocus mechanism of the 2nd embodiment of the present invention;
Fig. 5 is the lens sectional view partly of the autofocus mechanism of the 3rd embodiment of the present invention;
Fig. 6 is the front view (FV) of the lens part of the 3rd embodiment of the present invention;
Fig. 7 is the structural map of existing autofocus mechanism;
Fig. 8 is the structural map of the low coverage focusing action of existing autofocus mechanism;
Fig. 9 is the structural map of the remote focusing action of existing autofocus mechanism.
Next, will be illustrated together with accompanying drawing embodiments of the invention.Details are as follows for it:
Fig. 1 is the lens sectional view partly that possesses the autofocus mechanism of camera of the present invention;
Fig. 2 is the front view (FV) of this lens part.
In above-mentioned drawing, 21 is lens, 22a, 22b is the guid arm that becomes one with the annulus 23 that is fixed on lens 21,24a, 24b is the outstanding guiding pillar that forms in camera substrate 25,26 is volute spring, 27 for the side that is positioned at supporter 28 is fixed in the electromagnetic mechanism of camera substrate 25, and 29 is the drive plate of electromagnetic mechanism 27.
In this embodiment, lens 21 is because the diffusion strength of volute spring 26 and being pressed, and when the place ahead that advances to camera (in Fig. 1 above), promptly becomes closely focusing position as shown in the figure.And, in this state, guid arm 22a just and be located at the stop collar 30(of guiding pillar 24a leading section such as E and encircle etc.) contact.
In addition, electromagnetic mechanism 27 is powered and drive plate 29 when depressing guid arm 22a, and it is mobile that lens 21 retreats to the substrate 25 of camera from illustrated position, at this moment, then contacts with the substrate 25 of camera with the front portion of the tube 31 of guid arm 22a one.When lens 21 retreats like this, remote focusing position.
Fig. 3 is to the range-measuring circuit figure of above-mentioned electromagnetic mechanism 27 according to the distance measuring signal power supply.
In this drawing, 32 is the electric current limiting resistance, and 33 is the capacitor of pre-charge before range finding, 34 coupled switchs for closing with the pressing action interlock of shutter release button.
36 is driving circuit, and it is to make infrared light-emitting diode 37 luminous along with the connection of coupled switch 34.
38,39 is photodiode, and its accepts to export distance measuring signal from the emitted reflected light of light after subject reflects of above-mentioned infrared light-emitting diode 37 according to the principle of triangulation.
In addition, 40,41 is amplifying circuit, and 42 is comparer, and 43 is signal selecting circuit.
When depressing shutter release button, the coupled switch 34 that presses down interlock with its stage casing will be connected, and infrared light-emitting diode 37 will be luminous.
The light-emitting line of infrared light-emitting diode 37 is reflected by subject, and this reflected light is subjected to light by photodiode 38,39, and carries out the range finding of triangulation with the known method of the people who is familiar with this skill.
The distance measuring signal of photodiode 38,39 outputs is compared device 42 again and compares after amplifying circuit 40,41 amplifies.
It is selected by signal selecting circuit 43 to be subjected to comparer 42 distance measuring signal relatively.That is to say the distance measuring signal that is subjected to comparison as for person closely the time, this signal selecting circuit 43 just can not exported, and will export as for remote person the time to make transistor 35 be the admittance state.
Therefore, distance measuring signal be judged as closely and transistor 35 still when the off-state, 27 of electromagnetic mechanisms still maintain non-excitatory state, thus lens 21 as shown in Figure 1 be forward travel state, that is be at in-plant focusing position.In this state, because shutter release button can be pressed down to terminal section, so shutter will move.
Distance measuring signal is as being judged to be broken into when remote, owing to the output of signal selecting circuit 43 makes transistor 35 be the admittance state.
For this reason, the discharge current of capacitor 33 will flow into electromagnetic mechanism 27 at one stroke, and this electromagnetic mechanism 27 will attract drive plate 29 with very strong strength.
Thereby retreating rapidly is mobile owing to depressing of drive plate 29 drives for lens 21, and moves on to remote focusing position.
Be used as after the above-mentioned action, electromagnetic mechanism 27 is owing to the electric current that is subjected to flowing through from battery supply 44 electric current limiting resistance 32, coupled switch 34, transistor 35 causes excitatory effect, and makes lens 21 remain on going-back position.
In this state, shutter release button can be pressed down to terminal section, so shutter can move.
As Fig. 4 demonstration is the sectional view of the lens part with autofocus mechanism of the present invention the 2nd embodiment.
In the present embodiment, have toroidal core 46 around the lens 45 by U font section, electromagnetic mechanism 48 with the coil 47 that is located in this U font section is formed in addition, is installed with the discoideus movable iron 49 that can be attracted driving by toroidal core 46 on lens 45.
When lens 45 was subjected to advancing strength owing to spring 50, when common, the lip portions 45a of lens 45 then became on the progressive position that contacts with the section shape 46a of portion of the inner peripheral surface of toroidal core 46.
When distance measuring signal became closely as judging, the same with the foregoing description 1, electromagnetic mechanism 48 still was non-excitatory state, and 45 of lens are generally advanced as shown and become closely focusing position.
When remote, because the excitatory effect of electromagnetic mechanism 48, movable iron 49 is attracted distance measuring signal as judging into, and 45 of lens retreat and move to remote focusing position.
Shown in Figure 5 then is the sectional view partly of the lens with autofocus mechanism of the present invention's the 3rd embodiment, and Fig. 6 is the front view (FV) of this lens part.
In this embodiment, it has formed a side of the electromagnetic mechanism 53 that is made of the iron core 51 of U font section and coil 52 being located at lens 54, simultaneously being fixed on the such formation of lens 54 by the movable iron 55 that this electromagnetic mechanism 53 attracts.
In addition, lens 54 is guided pillar 56,57 guidings, and owing to be subjected to the strength of advancing such as spring 58, becomes closely focusing position in normality.
And at this closely on the focusing position, the teat 54a of lens 54 then contacts with the section shape 51a of portion of unshakable in one's determination 51.
So the action of this embodiment is identical with the 2nd embodiment shown in Figure 4.
In each above-mentioned embodiment, we become closely focusing position for can mat spring strength lens being advanced, the mat electromagnetic mechanism makes it retreat the structure that drives and move to remote focusing position to be described again, but it also retreats lens to make mat spring strength, make the remote focusing position of being everlasting at that time, when electromagnetic mechanism moves, make before it and then move to the closely structure of focusing position with this driving force.
In addition, also some camera is by a slice lens that move in the lens that possesses plural lens it to be focused automatically.This camera can the mobile lens camera lens, makes its structure of focusing automatically and make only mobile focal length with lens.
Have as described above, the autofocus mechanism relevant with the present invention is the spring part by any one position that lens is moved to the 1st position or the 2nd position, with make lens move to his electromagnetic mechanism of location to constitute in a side position, therefore lens is kept not rotate and advanced and retreat, and needn't install mechanical interlinked mechanism and make it become electric driving structure, so that the present invention reaches in being installed in camera on the problem such as production cost is very favourable.
In addition, the present invention's electromagnetic mechanism is with the discharge current of supplying with capacitor it to be done after the initial stage action, the structure that electric current is flowed by the electric current limiting resistance again, so it becomes the few a kind of autofocus mechanism of power consumption of battery supply.
Claims (2)
1, a kind of autofocus mechanism of camera, photographic lens is moved in the 1st position of advancing and the 2nd position that retreats and make focusing whole, it is characterized in that, this mechanism is by the spring part that photographic lens is moved to any one position of the 1st position or the 2nd position, with carry out corresponding action with the distance measuring signal that satisfies certain condition, the electromagnetic mechanism that makes photographic lens in a side position move to another position constitutes.
2, the autofocus mechanism of camera according to claim 1, it is characterized in that, above-mentioned electromagnetic mechanism has the electric current limiting resistance that is located in the current supply circuit, with capacitor that can pre-charge, make electromagnetic mechanism just interim, driven by the discharge current of capacitor, thereafter in action, be powered by the electric current limiting resistance, and keep action by the battery supply electric current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92104988 CN1080407A (en) | 1992-06-19 | 1992-06-19 | The autofocus mechanism of camera |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92104988 CN1080407A (en) | 1992-06-19 | 1992-06-19 | The autofocus mechanism of camera |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1080407A true CN1080407A (en) | 1994-01-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 92104988 Pending CN1080407A (en) | 1992-06-19 | 1992-06-19 | The autofocus mechanism of camera |
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|---|---|
| CN (1) | CN1080407A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100412596C (en) * | 2004-02-24 | 2008-08-20 | 精工电子有限公司 | Optical module and camera module |
| CN100462766C (en) * | 2005-11-22 | 2009-02-18 | 株式会社卡西欧日立移动通信 | Imaging apparatus and lens movement control method |
| US7650067B2 (en) | 2006-02-17 | 2010-01-19 | Hon Hai Precision Industry Co., Ltd. | Lens module with focusing mechanism |
| CN101046597B (en) * | 2006-03-30 | 2010-10-06 | 光宝科技股份有限公司 | Electronic zooming device and method for camera |
| CN1749839B (en) * | 2002-07-09 | 2011-04-20 | 佳能株式会社 | Image pickup apparatus and power supply control method therefor |
| CN102591099A (en) * | 2000-07-31 | 2012-07-18 | 三洋电机株式会社 | Electronic camera and focus controlling method |
| CN103415806A (en) * | 2011-03-21 | 2013-11-27 | 卡尔斯特里姆保健公司 | Autofocus method using liquid lens |
-
1992
- 1992-06-19 CN CN 92104988 patent/CN1080407A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102591099A (en) * | 2000-07-31 | 2012-07-18 | 三洋电机株式会社 | Electronic camera and focus controlling method |
| CN1749839B (en) * | 2002-07-09 | 2011-04-20 | 佳能株式会社 | Image pickup apparatus and power supply control method therefor |
| CN100412596C (en) * | 2004-02-24 | 2008-08-20 | 精工电子有限公司 | Optical module and camera module |
| CN100462766C (en) * | 2005-11-22 | 2009-02-18 | 株式会社卡西欧日立移动通信 | Imaging apparatus and lens movement control method |
| US7650067B2 (en) | 2006-02-17 | 2010-01-19 | Hon Hai Precision Industry Co., Ltd. | Lens module with focusing mechanism |
| CN101046597B (en) * | 2006-03-30 | 2010-10-06 | 光宝科技股份有限公司 | Electronic zooming device and method for camera |
| CN103415806A (en) * | 2011-03-21 | 2013-11-27 | 卡尔斯特里姆保健公司 | Autofocus method using liquid lens |
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