CN101261423A - Anti-dazzling screen and focusing lens location judging system - Google Patents
Anti-dazzling screen and focusing lens location judging system Download PDFInfo
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- CN101261423A CN101261423A CNA2007100877352A CN200710087735A CN101261423A CN 101261423 A CN101261423 A CN 101261423A CN A2007100877352 A CNA2007100877352 A CN A2007100877352A CN 200710087735 A CN200710087735 A CN 200710087735A CN 101261423 A CN101261423 A CN 101261423A
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Abstract
The invention relates to a shade chip and a judging system for a focusing lens position. The system comprises the shade chip, a light interrupter and a processing module. The shade chip comprises a first area and a second area. The length of each sub-area which is shaded in the first area is first length and the length of each un-shaded sub-area gradually increases from the center of the shade chip to a first borderline of the shade chip. The length of each un-shaded sub-area in the second area is a second length and the length of each shaded sub-area in the second area gradually increases for the center of the shade chip to the borderline of the shade chip. The light interrupter moves within the focusing scope and the shade chip produces a high signal and a low signal. The processing module judges the focusing lens position according to the high signal and the low signal.
Description
Technical field
The present invention relates to a kind of focusing system and method, and particularly a kind of anti-dazzling screen and can judge the system of focus lens position.
Background technology
Along with the evolution in epoch, the development of camera is developed into by image sensing unit by the camera of traditional egative film formula, as the digital camera of Charged Coupled Device (CCD) or complementary matal-oxide semiconductor (CMOS) replacement egative film.The digital photos that goes out owing to digital camera is captured can be easily at relevant apparatus, and as inspecting in the computer system and handling, therefore, digital camera has become one of necessary article in modern's life.
The function of automatic focusing is provided in the digital camera usually.Fig. 1 shows the relation of anti-dazzling screen and Photo Interrupter in the known automatic focusing.In known automatic focus process, owing to can't directly judge the position of focus lens, therefore, Photo Interrupter 1 must playback earlier to mechanical origin (11 or 12), as optic infinitely long-range (∞) or near-end (NEAR).Afterwards, the action that begins again to focus automatically and search.When Photo Interrupter 1 was mobile in focusing range, Photo Interrupter 1 can produce different height (High) low (Low) signal according to the design of anti-dazzling screen 2.When the subregion that rayed covers to anti-dazzling screen 2, as 21 o'clock, Photo Interrupter 1 can detect low signal, when rayed to anti-dazzling screen 2 unshaded subregions, as 22 o'clock, Photo Interrupter 1 can detect high signal.
Just as above-mentioned, known automatic focusing method is to set the length unanimity of each subregion that covers on the anti-dazzling screen 2, and the length of each unshaded subregion is also consistent, its shortcoming is that digital camera is when each start or replacement, Photo Interrupter 1 all must playback earlier to mechanical origin (11 or 12), to guarantee the reference position of Photo Interrupter 1.
In addition, in the process that automatically focusing is searched, when driving drive unit that Photo Interrupter 1 moves and take off the phenomenon of accent, will cause focusing automatically to be failed.Photo Interrupter 1 even may run out of outside the scope of anti-dazzling screen 2 is because detecting is less than anti-dazzling screen 2 and then cause and work as machine.In addition, in known automatic focusing method, if when the electronic system of digital camera inside when machine or drive unit the inlay card fault took place momently, Photo Interrupter 1 also all must return to mechanical origin (11 or 12), to guarantee the reference position of Photo Interrupter 1 once more more again.So, digital camera will be wasted the too much time and repeat to return to the action of mechanical origin (11 or 12) at Photo Interrupter 1.
Summary of the invention
Therefore, the technical problem to be solved in the present invention is, at the above-mentioned defective of prior art, provides a kind of anti-dazzling screen and the focus lens location judging system that can fast and effeciently determine the focus lens position.
The technical solution adopted for the present invention to solve the technical problems is, a kind of anti-dazzling screen is provided, and comprising:
The first area, the length of each subregion that covers in the described first area gradually changes according to the border, first border to the second of first function by described first area, and the length of unshaded each subregion gradually changes according to described first border to described second border of second function by described first area in the described first area; And
Second area, the length of unshaded each subregion gradually changes according to four borders, the 3rd border to the of the 3rd function by described second area in the described second area, and the length of each subregion that covers in the described second area gradually changes according to four borders, the 3rd border to the of the 4th function by described second area.
In anti-dazzling screen of the present invention, the length of these subregions that cover in the described first area is the first set step number, and the length of unshaded these subregions is incremented to first end of described anti-dazzling screen gradually according to described second function in the described first area by the center of described anti-dazzling screen.
In anti-dazzling screen of the present invention, the length of unshaded these subregions is the second set step number in the described second area, and the length of these subregions that cover in the described second area is incremented to second end of described anti-dazzling screen gradually by the center of described anti-dazzling screen according to described the 4th function.
In anti-dazzling screen of the present invention, more comprise at least one borderline region, at least comprise unshaded subregion and the subregion that covers in the described borderline region, and the length of described unshaded subregion is the 3rd set step number, the length of the described subregion that covers is the 4th set step number.
The present invention also provides a kind of focus lens location judging system, comprising:
Anti-dazzling screen, comprise first area and second area, the length of each subregion that covers in the wherein said first area gradually changes according to the border, first border to the second of first function by described first area, and the length of unshaded each subregion gradually changes according to the border, first border to the second of second function by described first area in the described first area, the length of unshaded each subregion gradually changes according to four borders, the 3rd border to the of the 3rd function by described second area in the described second area, and the length of each subregion that covers in the described second area gradually changes according to four borders, the 3rd border to the of the 4th function by described second area;
The Photo Interrupter that moves in the focusing range of described anti-dazzling screen is used for obtaining high and low signal respectively when light beam irradiates extremely during these subregions that do not cover and cover of described anti-dazzling screen; And
Processing module is used for low signal and the lasting corresponding step number time that occurs of high signal according to described Photo Interrupter generation, judges the position of focus lens.
In focus lens location judging system of the present invention, the length of these subregions that cover in the described first area is the first both measured length, and the length of unshaded these subregions is incremented to first end of described anti-dazzling screen gradually in the described first area by the center of described anti-dazzling screen according to described second function.
In focus lens location judging system of the present invention, described processing module comprises:
The first area judge module is used to judge corresponding step number time that described low signal occurs whether corresponding to the described first both measured length, thereby judges whether focus lens is positioned at the first area of described anti-dazzling screen; And
The primary importance judge module is used for the corresponding step number time according to described high signal appearance, determines that focus lens is positioned at described first area and the corresponding position of described high signal.
In focus lens location judging system of the present invention, the length of unshaded these subregions is the second both measured length in the described second area, and the length of these subregions that cover in the described second area is incremented to second end of described anti-dazzling screen gradually by the center of described anti-dazzling screen according to described the 4th function.
In focus lens location judging system of the present invention, described processing module also comprises:
The second area judge module is used to judge corresponding step number time that described high signal occurs whether corresponding to the described second both measured length, thereby judges whether focus lens is positioned at the second area of described anti-dazzling screen; And
Second place judge module is used for the corresponding step number time according to described low signal appearance, determines that focus lens is positioned at described second area and the corresponding position of described low signal.
In focus lens location judging system of the present invention, described anti-dazzling screen also comprises at least one borderline region, at least comprise unshaded subregion and the subregion that covers, wherein, the length of unshaded described subregion is the 3rd both measured length, the length of the described subregion that covers is the 4th both measured length, and
Described processing module also comprises: the borderline region judge module, be used to judge corresponding step number time that these high signals and low signal occur respectively whether corresponding to the described the 3rd both both measured length of measured length and the 4th, thereby judge whether described camera lens is positioned at described borderline region.
Implement anti-dazzling screen of the present invention and focus lens location judging system, have following beneficial effect: the present invention can more fast and effeciently determine the position of focus lens after the position of focus lens is determined by the asymmetric openings anti-dazzling screen of particular design, the search operation of can focusing automatically immediately.In addition, the present invention does not need extra border to detect switch can to confirm that just boundary position runs out of outside the border to avoid Photo Interrupter or focus lens.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is the synoptic diagram that concerns of the anti-dazzling screen of known automatic focusing and Photo Interrupter;
Fig. 2 is the synoptic diagram according to the focus lens location judging system of the embodiment of the invention;
Fig. 3 is the synoptic diagram according to the anti-dazzling screen of the embodiment of the invention;
Fig. 4 is the process flow diagram according to the focus lens position decision method of the embodiment of the invention;
Fig. 5 is the process flow diagram according to the focus lens position decision method of the embodiment of the invention;
Fig. 6 is the synoptic diagram of focus lens location determination example; And
Fig. 7 is the synoptic diagram according to the left margin zone of the anti-dazzling screen of the embodiment of the invention.
The drawing reference numeral explanation:
1～Photo Interrupter; 11,12～mechanical origin;
∞～infinitely long-range; NEAR～near-end;
200～focus lens location judging system; 210～processing module;
220～step motor, 230～anti-dazzling screen;
FR～focusing range; Zone, 231～left side;
232～right zone; C～center;
2310～left margin zone; 2320～right margin zone;
2301～left margin; 2302～right margin;
101,102～position;
2311,2312,2313,2314,2315,2316,2317,2318,2321,2322,2323,2324,2325,2326,2327,2328, the subregion of 2310a, 2310c～cover;
2319,23110,23111,23112,23113,23114,23115,23116,2329,23210,23211,23212,23213,23214,23215,23216,2310b, 2310d～unshaded subregion.
Embodiment
Fig. 2 shows the focus lens location judging system according to the embodiment of the invention.
Focus lens location judging system 200 comprises a processing module 210, a step motor 220, an anti-dazzling screen 230 and a Photo Interrupter 1 at least.Focus lens location judging system 200 can be that camera head such as digital camera, digital telescope or other need be made the machinery and equipment that the position is adjusted.Step motor 220 is used to drive Photo Interrupter 1 and moves in focusing range FR.Photo Interrupter 1 can produce different high-low signals according to the particular design of anti-dazzling screen 230.When rayed during to subregion that anti-dazzling screen 230 covers, Photo Interrupter 1 can detect low signal, and when rayed during to anti-dazzling screen 230 unshaded subregions, Photo Interrupter 1 can detect high signal.Wherein, the details of anti-dazzling screen 230 will in after describe.Processing module 210 can receive the signal that Photo Interrupter 1 is produced, and learns the step number that Photo Interrupter 1 moves, and carries out according to focus lens position decision method of the present invention.
Fig. 3 shows the anti-dazzling screen according to the embodiment of the invention.As shown in the figure, anti-dazzling screen 230 has the design of asymmetric opening.Divide with center C, anti-dazzling screen 230 has first area and second area, i.e. 231 and one right zone 232, zone, a left side.
Zone, a left side 231 comprises 2311,2312,2313,2314,2315,2316,2317 and 2318 and 8 unshaded subregions 2319,23110,23111,23112,23113,23114,23115 and 23116 of 8 subregions that cover.Wherein, (as, left margin 2301) gradually changes the length of each subregion that covers in the left side zone 231 to second border by first border in zone, a left side (as, center C) according to first function.Preferably, the length of each subregion that covers in the zone, a left side 231 is one first set step number, as 10 steps.What must remind is, length in this embodiment represents that with step number on behalf of step motor, it move the transportable length of this step number, but not in order to limit the present invention.(as, center C) (as, left margin 2301) gradually changes the length of unshaded each subregion to second border from first border in zone, a left side according to second function in the left side zone 231.Preferably, unshaded subregion length is all inequality in the left side zone 231, and the length of unshaded each subregion is incremented to the left margin 2301 (being first end of anti-dazzling screen) of anti-dazzling screen gradually in the zone 231, a left side by the center of anti-dazzling screen.For instance, unshaded subregion 2319,23110,23111,23112,23113,23114,23115 and 23116 length were respectively for 12,15,18,20,22,25,28 and 30 steps.
Right zone 232 comprises 2321,2322,2323,2324,2325,2326,2327 and 2328 and 8 unshaded subregions 2329,23210,23211,23212,23213,23214,23215 and 23216 of 8 subregions that cover.Wherein, in the right zone 232 length of unshaded each subregion (as, right margin 2302) gradually changes to the 4th border by the 3rd border in right zone (as, center C) according to the 3rd function.Preferably, the length of each subregion that covers in the right zone 232 is one second set step number, as 10 steps.(as, center C) (as, right margin 2302) gradually changes the length of each subregion that covers in the right zone 232 to the 4th border from the 3rd border in right zone according to the 4th function.Preferably, the subregion length that covers in the right zone 232 is all inequality, and the length of each subregion that covers in the right zone is incremented to the right margin 2302 (being second end of anti-dazzling screen) of anti-dazzling screen gradually by the center of anti-dazzling screen.For instance, subregion 2321,2322,2323,2324,2325,2326,2327 that covers and 2328 length were respectively for 12,15,18,20,22,25,28 and 30 steps.
In addition, zone, a left side 231 more comprises a left margin zone 2310, and it has at least one group of subregion that does not cover and cover, and the length of this unshaded subregion is the 3rd set step number, and the length of the subregion that this covers is the 4th set step number; And the length of each subregion in the left margin zone 2310 is all less than the length of each subregion that covers in the left side zone 231.Similarly, right zone 232 more comprises a right margin zone 2320, and it has at least one group and covers and unshaded subregion, and its similar is in left margin zone 2310; And the length of each subregion in the right margin zone 2320 is all less than the length of unshaded each subregion in the right zone 232.The details of borderline region will in after describe.Mandatory declaration be, the length of each subregion that covers in the length of unshaded each subregion and the right zone in the above-mentioned first set step number, the second set step number, the zone 231, a left side only is the example in the present embodiment, the present invention is not limited thereto.In addition, the face shaping of anti-dazzling screen can be straight long strip type or circumference type.
Fig. 4 shows the focus lens position decision method according to the embodiment of the invention, is applicable to the anti-dazzling screen device with asymmetric opening, as digital camera and digital telescope etc.Wherein, anti-dazzling screen has first area and second area, i.e. a zone, a left side and a right zone.(as, left margin) gradually changes the length of each subregion that a left side covers in the zone to second border by first border in zone, a left side (as, center) according to first function.Preferably, the length of each subregion that covers in the left zone is one first set step number.And (as, center) (as, left margin) gradually changes the length of unshaded each subregion to second border from first border in left side zone according to second function in the left zone.Preferably, the length of unshaded each subregion is incremented to the left margin of anti-dazzling screen gradually in the left zone by the center of anti-dazzling screen.Correspondingly, described processing module comprises: the first area judge module is used to judge corresponding step number time that described low signal occurs whether corresponding to the described first both measured length, thereby judges whether focus lens is positioned at the first area of described anti-dazzling screen; And the primary importance judge module, be used for the corresponding step number time according to described high signal appearance, determine that focus lens is positioned at described first area and the corresponding position of described high signal.
(as, right margin) gradually changes the length of unshaded each subregion to the 4th border by the 3rd border in right zone (as, center) according to the 3rd function in the right zone.Preferably, the length of unshaded each subregion is one second set step number in the right zone.And (as, center C) (as, right margin) gradually changes the length of each subregion that covers in the right zone to the 4th border from the 3rd border in right zone according to the 4th function.Preferably, the length of each subregion that covers in the right zone is incremented to the right margin of anti-dazzling screen gradually by the center of anti-dazzling screen.Correspondingly, described processing module also comprises: the second area judge module is used to judge corresponding step number time that described high signal occurs whether corresponding to the described second both measured length, thereby judges whether focus lens is positioned at the second area of described anti-dazzling screen; And second place judge module, be used for the corresponding step number time according to described low signal appearance, determine that focus lens is positioned at described second area and the corresponding position of described low signal.
At first, as step S410, move Photo Interrupter by step motor.Simultaneously, Photo Interrupter utilizes anti-dazzling screen to produce high-low signal.Wherein, when each subregion that rayed to anti-dazzling screen covers, Photo Interrupter can obtain low signal, and when rayed during to unshaded each subregion of anti-dazzling screen, Photo Interrupter can obtain high signal.As step S420, the low signal and the high signal that produce according to Photo Interrupter continue to occur the corresponding step number of institute, judge the position of focus lens.
Fig. 5 shows the focus lens position decision method according to the embodiment of the invention.
As step S510, judge that low signal continues the corresponding step number of time of occurrence institute and whether equals the first set step number, as 10 steps.Corresponding step number is the first set step number if low signal continues time of occurrence institute, as step S520, continues the corresponding step number of time of occurrence institute according to high signal, judges that focus lens is positioned at an ad-hoc location in the zone, a left side of anti-dazzling screen.Corresponding step number is not to be the first set step number if low signal continues time of occurrence institute, as step S530, judges that high signal continues the corresponding step number of time of occurrence institute and whether equals the second set step number, as 10 steps.Corresponding step number is the second set step number if high signal continues time of occurrence institute, as step S540, continues the corresponding step number of time of occurrence institute according to low signal, judges that focus lens is positioned at an ad-hoc location in the right zone of anti-dazzling screen.Corresponding step number is not to be the second set step number if high signal continues time of occurrence institute, and then flow process is got back to step S510.
Mandatory declaration be when low signal continues the corresponding step number of time of occurrence institute and is the first set step number, can judge that then focus lens is arranged in the left zone of anti-dazzling screen.Because the length of each subregion that does not cover in the left zone is all inequality, therefore can according to high signal continue time of occurrence institute accordingly step number judge that focus lens is arranged in the ad-hoc location in the left zone of anti-dazzling screen.Similarly, when the corresponding step number of the lasting time of occurrence of high signal institute is the second set step number, can judge that then focus lens is arranged in the right zone of anti-dazzling screen.Because the length of each subregion that covers in the right zone is neither identical, therefore can according to low signal continue time of occurrence institute accordingly step number judge that focus lens is arranged in the ad-hoc location in the right zone of anti-dazzling screen.
Fig. 6 shows a focus lens location determination example.In this example, when Photo Interrupter 1 was moved to 102 process by position 101 in, Photo Interrupter 1 can detect high signals, the low signals in 10 steps and the 22 high signals that go on foot in 12 steps successively.When detecting the low signal in 10 steps, can judge that just focus lens is arranged in the left zone of anti-dazzling screen.And when detecting the high signal in 22 steps,, therefore can judge that focus lens is arranged in an ad-hoc location in the left zone of anti-dazzling screen according to " 22 " because the length of unshaded each subregion is all different in the left zone.Therefore, in this example, Photo Interrupter 1 just can be known the position of focus lens as long as moved for 44 steps (12+10+22=44).After the position of knowing focus lens, the search operation of just can directly focusing automatically.In known method, Photo Interrupter 1 must must playback earlier to optic infinitely long-range (∞) or near-end (NEAR) before the focusing automatically in each, and it must move for 409 steps (500 (total length)-91 (Photo Interrupter 1 present position)=409).The embodiment of the invention can be saved the time in 365 steps (409-44=365) than known method.
Refer again to Fig. 3, as previously mentioned, left side zone 231 more comprises left margin zone 2310, and it has at least one group and covers and unshaded subregion, and the length of this unshaded subregion is the 3rd set step number, and the length of the subregion that this covers is the 4th set step number; And the length of each subregion that the length of each subregion in the left margin zone 2310 all covers in the left side zone 231.Fig. 7 shows the left margin zone according to the anti-dazzling screen of the embodiment of the invention.Left margin zone 2310 has first group and covers and unshaded subregion 2310a and 2310b.In addition, left margin zone 2310 has second group and covers and unshaded subregion 2310c and 2310d.In this embodiment, first group of length that covers with unshaded subregion 2310a and 2310b is that 2, the second groups of length that cover with unshaded subregion 2310c and 2310d are 5.The length (10) of each subregion that the length of each subregion in the left margin zone 2310 (2 or 5) all covers in the left side zone 231.Similarly, right zone 232 can comprise right margin zone 2320, and its structure can be similar to left margin zone 2310.Because when Photo Interrupter 1 and focus lens move, must confirm that it can not run out of outside the border.Therefore, anti-dazzling screen must have above-mentioned design, and processing module also comprises the borderline region judge module, be used to judge corresponding step number time that these high signals and low signal occur respectively whether corresponding to the described the 3rd both both measured length of measured length and the 4th, thereby judge whether described camera lens is positioned at described borderline region.Be that processing module can judge whether Photo Interrupter 1 has arrived borderline region according to the signal that Photo Interrupter 1 is detected.
When low signal continues the corresponding step number of time of occurrence institute is 2 and high signal when continuing the corresponding step number of time of occurrence institute and being 2, judges that Photo Interrupter 1 has arrived the left margin zone.When high signal continues the corresponding step number of time of occurrence institute is 2 and low signal when continuing the corresponding step number of time of occurrence institute and being 5, judges that Photo Interrupter 1 has arrived the left margin zone.When low signal continues the corresponding step number of time of occurrence institute is 5 and high signal when continuing the corresponding step number of time of occurrence institute and being 5, judges that Photo Interrupter 1 has arrived the left margin zone.Be 2 when low signal continues the corresponding step number of time of occurrence institute, high signal continue the corresponding step number of time of occurrence institute be 2, after, low signal continue again the corresponding step number of time of occurrence institute be 5 and high signal to continue the corresponding step number of time of occurrence institute again be 5 o'clock, judge that Photo Interrupter 1 has arrived the left margin zone.Or, when changing institute, the height of any signal continues to occur the corresponding step number of institute respectively all less than 10 the time, judge that Photo Interrupter 1 has arrived the left margin zone.
In addition, be 2 and low signal when continuing the corresponding step number of time of occurrence institute and being 2 when high signal continues the corresponding step number of time of occurrence institute, judge that Photo Interrupter 1 has arrived the right margin zone.When low signal continues the corresponding step number of time of occurrence institute is 2 and high signal when continuing the corresponding step number of time of occurrence institute and being 5, judges that Photo Interrupter 1 has arrived the right margin zone.When high signal continues the corresponding step number of time of occurrence institute is 5 and low signal when continuing the corresponding step number of time of occurrence institute and being 5, judges that Photo Interrupter 1 has arrived the right margin zone.Be 2 when high signal continues the corresponding step number of time of occurrence institute, low signal continue the corresponding step number of time of occurrence institute be 2, after, high signal continue again the corresponding step number of time of occurrence institute be 5 and low signal to continue the corresponding step number of time of occurrence institute again be 5 o'clock, judge that Photo Interrupter 1 has arrived the right margin zone.Or, when changing institute, the height of any signal continues to occur the corresponding step number of institute respectively all less than 10 the time, judge that Photo Interrupter 1 has arrived the right margin zone.
Therefore, the present invention can more fast and effeciently determine the position of focus lens by the asymmetric openings anti-dazzling screen of particular design, after the position of focus lens is determined, and the search operation of can focusing automatically immediately.In addition, the present invention does not need extra border to detect switch just can confirm boundary position, runs out of outside the border to avoid Photo Interrupter 1 or focus lens.
Method of the present invention, or specific kenel or its part, can be contained in tangible media with the kenel of program code, get (as embodied on computer readable) Storage Media as floppy disk, discs, hard disk or any other machine readable, wherein, when program code by machine, when loading and carrying out as computing machine, this machine becomes in order to participate in device of the present invention.Method and apparatus of the present invention also can be with the program code kenel by some transfer mediums, transmit as electric wire or cable, optical fiber or any transmission kenel, wherein, when program code by machine, when receiving, loading and carrying out as computing machine, this machine becomes in order to participate in device of the present invention.When the general service processor is done in fact, the program code associative processor provides a class of operation to be similar to the unique apparatus of using particular logic circuit.
Though the present invention discloses as above with preferred embodiment; right its is not in order to qualification the present invention, those skilled in the art, without departing from the spirit and scope of the present invention; change and retouching when doing some, thus protection scope of the present invention when with claim the person of being defined be as the criterion.
Claims (10)
1. an anti-dazzling screen is characterized in that, comprising:
The first area, the length of each subregion that covers in the described first area gradually changes according to the border, first border to the second of first function by described first area, and the length of unshaded each subregion gradually changes according to described first border to described second border of second function by described first area in the described first area; And
Second area, the length of unshaded each subregion gradually changes according to four borders, the 3rd border to the of the 3rd function by described second area in the described second area, and the length of each subregion that covers in the described second area gradually changes according to four borders, the 3rd border to the of the 4th function by described second area.
2. anti-dazzling screen as claimed in claim 1, it is characterized in that, the length of these subregions that cover in the described first area is the first set step number, and the length of unshaded these subregions is incremented to first end of described anti-dazzling screen gradually according to described second function in the described first area by the center of described anti-dazzling screen.
3. anti-dazzling screen as claimed in claim 2, it is characterized in that, the length of unshaded these subregions is the second set step number in the described second area, and the length of these subregions that cover in the described second area is incremented to second end of described anti-dazzling screen gradually by the center of described anti-dazzling screen according to described the 4th function.
4. anti-dazzling screen as claimed in claim 3, it is characterized in that, more comprise at least one borderline region, at least comprise unshaded subregion and the subregion that covers in the described borderline region, and the length of described unshaded subregion is the 3rd set step number, and the length of the described subregion that covers is the 4th set step number.
5. a focus lens location judging system is characterized in that, comprising:
Anti-dazzling screen, comprise first area and second area, the length of each subregion that covers in the wherein said first area gradually changes according to the border, first border to the second of first function by described first area, and the length of unshaded each subregion gradually changes according to the border, first border to the second of second function by described first area in the described first area, the length of unshaded each subregion gradually changes according to four borders, the 3rd border to the of the 3rd function by described second area in the described second area, and the length of each subregion that covers in the described second area gradually changes according to four borders, the 3rd border to the of the 4th function by described second area;
The Photo Interrupter that moves in the focusing range of described anti-dazzling screen is used for obtaining high and low signal respectively when light beam irradiates extremely during these subregions that do not cover and cover of described anti-dazzling screen; And
Processing module is used for low signal and the lasting corresponding step number time that occurs of high signal according to described Photo Interrupter generation, judges the position of focus lens.
6. focus lens location judging system as claimed in claim 5, it is characterized in that, the length of these subregions that cover in the described first area is the first both measured length, and the length of unshaded these subregions is incremented to first end of described anti-dazzling screen gradually in the described first area by the center of described anti-dazzling screen according to described second function.
7. focus lens location judging system as claimed in claim 6 is characterized in that, described processing module comprises:
The first area judge module is used to judge corresponding step number time that described low signal occurs whether corresponding to the described first both measured length, thereby judges whether focus lens is positioned at the first area of described anti-dazzling screen; And
The primary importance judge module is used for the corresponding step number time according to described high signal appearance, determines that focus lens is positioned at described first area and the corresponding position of described high signal.
8. focus lens location judging system as claimed in claim 6, it is characterized in that, the length of unshaded these subregions is the second both measured length in the described second area, and the length of these subregions that cover in the described second area is incremented to second end of described anti-dazzling screen gradually by the center of described anti-dazzling screen according to described the 4th function.
9. focus lens location judging system as claimed in claim 8 is characterized in that, described processing module also comprises:
The second area judge module is used to judge corresponding step number time that described high signal occurs whether corresponding to the described second both measured length, thereby judges whether focus lens is positioned at the second area of described anti-dazzling screen; And
Second place judge module is used for the corresponding step number time according to described low signal appearance, determines that focus lens is positioned at described second area and the corresponding position of described low signal.
10. focus lens location judging system as claimed in claim 7, it is characterized in that, described anti-dazzling screen also comprises at least one borderline region, at least comprise unshaded subregion and the subregion that covers, wherein, the length of unshaded described subregion is the 3rd both measured length, and the length of the described subregion that covers is the 4th both measured length, and
Described processing module also comprises: the borderline region judge module, be used to judge corresponding step number time that these high signals and low signal occur respectively whether corresponding to the described the 3rd both both measured length of measured length and the 4th, thereby judge whether described camera lens is positioned at described borderline region.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710087735A CN100592188C (en) | 2007-03-07 | 2007-03-07 | Anti-dazzling screen and focusing lens location judging system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710087735A CN100592188C (en) | 2007-03-07 | 2007-03-07 | Anti-dazzling screen and focusing lens location judging system |
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| Publication Number | Publication Date |
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| CN101261423A true CN101261423A (en) | 2008-09-10 |
| CN100592188C CN100592188C (en) | 2010-02-24 |
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| CN200710087735A Expired - Fee Related CN100592188C (en) | 2007-03-07 | 2007-03-07 | Anti-dazzling screen and focusing lens location judging system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102798958A (en) * | 2011-05-27 | 2012-11-28 | 亚洲光学股份有限公司 | Focusing detection mechanism of lens |
| CN109240022A (en) * | 2017-07-11 | 2019-01-18 | 光芒光学股份有限公司 | Zoom lens |
| CN109839786A (en) * | 2017-11-29 | 2019-06-04 | 扬明光学股份有限公司 | Camera lens and its manufacturing method |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI432871B (en) * | 2011-03-01 | 2014-04-01 | Altek Corp | Auto focusing lens module and calibrating method thereof |
-
2007
- 2007-03-07 CN CN200710087735A patent/CN100592188C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102798958A (en) * | 2011-05-27 | 2012-11-28 | 亚洲光学股份有限公司 | Focusing detection mechanism of lens |
| CN109240022A (en) * | 2017-07-11 | 2019-01-18 | 光芒光学股份有限公司 | Zoom lens |
| CN109839786A (en) * | 2017-11-29 | 2019-06-04 | 扬明光学股份有限公司 | Camera lens and its manufacturing method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100592188C (en) | 2010-02-24 |
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