CN1260612C - Automatic focus regulator - Google Patents
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- CN1260612C CN1260612C CN03136023.8A CN03136023A CN1260612C CN 1260612 C CN1260612 C CN 1260612C CN 03136023 A CN03136023 A CN 03136023A CN 1260612 C CN1260612 C CN 1260612C
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Abstract
The invention provides an automatic focusing system which can find a focusing point at high speed and whose main body does not become large-sized. An optical part 2 guides light from an object 1 to a photodetection part 3 and this photodetection part 3 images the object 1 as a digital image. A movable split image prism 4 is arranged between a position right before a photodetection surface of the photodetection part 3 in the optical path of the optical part 2 and a position outside the optical path of the optical part 2. Then a control part 9 detects the deviation quantity of a video signal based upon a light beam passing through the split image prism 4 to adjust the focus of the optical part 2 according to the deviation quantity.
Description
Technical field
The present invention relates to a kind of automatic focus-regulating device.
Background technology
Digital camera has the picture pick-up device that can electrically detect vision signal by photographic lens.The known technology that has a kind of about digital camera, it utilizes from the monochrome information of the vision signal of this picture pick-up device output and focuses to obtain correct focus state.
This technology is a kind of photographic lens to be finely tuned technology in the hope of the good lens position of the contrast of the picture of sening as an envoy to, because its control photographic lens moves to the high-contrast position, so be commonly referred to as sharpness detection mode (contrast mode) AF.
On the other hand, at roll film camera (Silver salt カ メ ラ) single lens reflex in, the general AF that adopts according to TTL (Through The Lens) phase differential mode.By photographic lens be taken into from the light beam of subject by movable mirror reflects, be directed (Polaroid) to the face of equal value (Polaroid face) of film.Then, by the lens secondary imaging on the face of equal value that is arranged on above-mentioned film, above-mentioned light beam is directed on the sensor of AF (automatic focus) usefulness, becomes secondary imaging face.AF according to TTL phase differential mode is exactly by moving the lens on Polaroid while the position of measuring this secondary imaging face, making Polaroid face become the control of focal position.
In addition, AF according to TTL phase differential mode utilizes dialyte lens that the beam separation of above-mentioned secondary imaging optical system is become two parts (pupil is cut apart), and be directed on the linear sensor, obtain focal position by the skew between comparison and the predetermined setting.
But, though the sensor of using from AF also can be also used as the sensor this point of the usefulness of photographing, the AF of above-mentioned contrast mode is favourable to the miniaturization of camera body, but because to move photographic lens to obtain focal position, so can't go out the regulated quantity of focal adjustments and regulate direction to the good direction of the contrast of picture with a sensing detection.Therefore, have following problem: the travelling shot lens need the time, and so-called release delay is elongated in the camera technology.
On the other hand, because the AF of TTL phase differential mode only obtains focal position based on the skew with respect to setting, can obtain focal position in moment.That is, can shorten release delay.But, there is following problem: because must have the secondary imaging optical system that is used to release and carries out that pupil is cut apart and then carry out imaging again from the part of the light beam of subject, so the part number increases, cost increase, camera body itself also becomes big simultaneously.
Summary of the invention
For addressing the above problem, the object of the invention is to provide a kind of automatic focus-regulating device that can obtain focus point apace.Another purpose is to provide a kind of body volume that can not make to become big automatic focus-regulating device.
That is, first invention is characterised in that to possess with lower member: light receiving component, and its subject shooting is digital picture; Optics, it is used for the light from subject is directed to above-mentioned light receiving component; Separating prism (split image prism), it can move between the position outside the light path of the position of the sensitive surface front of the above-mentioned light receiving component in the light path of above-mentioned optics and above-mentioned optics; Control assembly, it detects the side-play amount based on the vision signal of the light by above-mentioned separating prism, and according to this side-play amount, carries out the focal adjustments of above-mentioned optics.
In addition, second invention is characterised in that, comprises with lower member: light receiving component, and its subject shooting is digital picture; Optics, it is used for the light from subject is directed to above-mentioned light receiving component; Separating prism, it is arranged on the light path position outward of the sensitive surface front of above-mentioned light receiving component, above-mentioned optics; Deflection component, it can enter or withdraw from the light path of above-mentioned optics, and the part from the light beam of subject is directed to above-mentioned separating prism; Control assembly, it detects the side-play amount based on the vision signal of the light by above-mentioned separating prism, and according to this side-play amount, carries out the focal adjustments of above-mentioned optics.
According to the automatic focus-regulating device of first invention, by optics the light from subject is directed on the light receiving component, be above-mentioned subject shooting digital picture by this light receiving component.Between the position outside the light path of the position of the sensitive surface front of the above-mentioned light receiving component in the light path at above-mentioned optics and above-mentioned optics, dispose transportable separating prism.Detect side-play amount by control assembly, carry out the focal adjustments of above-mentioned optics according to this side-play amount based on the vision signal of the light by above-mentioned separating prism.
According to the automatic focus-regulating device of second invention,, be above-mentioned subject shooting digital picture by this light receiving component by the light from subject being directed on the light receiving component by optics.On the position outside the light path of the sensitive surface front of above-mentioned optics, above-mentioned optics separating prism is set.And then by can entering or withdraw from the deflection component of the light path of above-mentioned optics, the part from the light beam of subject is directed to above-mentioned separating prism.Then, detect side-play amount, carry out the focal adjustments of above-mentioned optics according to this side-play amount based on the vision signal of the light by above-mentioned separating prism by control assembly.
Description of drawings
Fig. 1 illustrates the structure of first embodiment of the present invention, and the block scheme of the basic structure of automatic focus-regulating device is shown.
Fig. 2 is the outward appearance skeleton view that the structure of separating prism 4 is shown.
Fig. 3 is the exterior view that the position of the separating prism 4 on the light accepting part 3 is shown.
Fig. 4 illustrates the relation of separating prism and focus condition, the state of the separating prism when (a) being explanation focusing and the picture of subject.(b) example of the diopter (See ぇ side) of the picture of subject under (a) state is shown.
Fig. 5 illustrates the relation of separating prism and focus condition, (a) be that explanation is under the situation of the picture of the subject of separating prism the place ahead imaging (prefocusing) wire, the accompanying drawing of the state of the picture of separating prism and subject (b) illustrates the example of diopter of the picture of the subject under (a) state.
Fig. 6 illustrates the relation of separating prism and focus condition, (a) be under the situation of explanation by the picture of separating prism imaging in the wings (back focuses on) wire subject, the accompanying drawing of the state of the picture of separating prism and subject (b) illustrates the example of diopter of the picture of the subject under (a) state.
Fig. 7 illustrates the relation of focal shift and vision signal skew, (a) is exterior view, (b) is the focus deviation (defocus amount) that detection is shown and the outboard profile of amount of bias.
Fig. 8 illustrates in order to detect the side-play amount of vision signal, only from vision signal, extract the example of the signal of handling out, (a) picture of the back focusing on the separating prism on the valid pixel is shown, this valid pixel is made up of a plurality of pixels that are arranged on the transverse direction, each pixel that (a) (b) is shown be black and white (promptly, the example of the pixel output in absence color filter), each pixel that (a) (c) is shown is that (ベ イ ヤ one: the example of the pixel output of bayer) arranging, each pixel that (a) (d) is shown are other examples that the pixel of the Bayer arrangement of RGB primary colors is exported to the Bayer of RGB primary colors.
Fig. 9 is focal adjustments action in explanation first embodiment of the present invention and the accompanying drawing that the surveyed area in the valid pixel is shown.
Figure 10 is the process flow diagram that action describes to the focal adjustments in first embodiment of the present invention.
Figure 11 is the accompanying drawing that is used to illustrate according to the error of the sloping portion of vision signal.
Figure 12 is the process flow diagram that the focal adjustments action of having considered according to the error of the sloping portion of vision signal is described.
Figure 13 is the accompanying drawing that is used to illustrate the rotation error of separating prism.
Figure 14 is the process flow diagram that action describes to the focal adjustments of the rotation error of having considered separating prism.
Figure 15 illustrates the structure of second embodiment of this invention, and the block scheme of the basic structure of automatic focus-regulating device is shown.
Figure 16 illustrates the exterior view of the position of the separating prism 4 on the light accepting part 3 in second embodiment.
Embodiment
Following with reference to accompanying drawing, embodiments of the invention are described.
Fig. 1 illustrates the structure of first embodiment of the present invention, and the basic structure block scheme of automatic focus-regulating device is shown.
Among Fig. 1, be directed into light accepting part 3 through optic 2 from the photography light beam of subject 1.Front face at this light accepting part 3 is provided with separating prism 4.Above-mentioned light accepting part 3 and above-mentioned optic 2 by first drive division 6 and second drive division 7, are carried out drive controlling by control part 9 respectively.
Above-mentioned separating prism 4 carries out drive controlling by the 3rd drive division 8 by control part 9, moves along diagram arrow A direction.That is, by control part 9 and the 3rd drive division 8, separating prism 4 can plug on the face of light accepting part 3.
And above-mentioned first drive division 6 is made of the driver part of image-signal processing system, and the second and the 3rd drive division 7 and 8 driver parts by mechanical system constitute.
Fig. 2 illustrates the outward appearance skeleton view of the structure of separating prism 4.
Illustrate as Fig. 2, separating prism 4 with two semicircle prism wedges that tilt to mutually opposite direction up and down or tilted configuration constitute.
Fig. 3 is the exterior view that the position of the separating prism 4 on the light accepting part 3 is shown.
Fig. 4～Fig. 6 illustrates the relation of separating prism and focus condition.Because the pass of this separating prism and focus condition ties up to " カ メ ラ skill Intraoperative Ha Application De Block ッ Network (camera technical manual) " (distribution on July 15th, 1979 of the industrial publishing house of (strain) description, wood love three works) in the 108th page～111 pages detailed record is arranged, here just based on this ground simple in structure principle of specification.
Separating prism is typically up and down as consistent formula prism, and the intersection point that wherein is positioned at two prism wedges on the optical axis of photographic lens 16 is a focusing surface, in the boundary portion of prism, as skew occurring.
The figure of the state of the separating prism when Fig. 4 (a) is explanation focusing and the picture of subject.(b) example of diopter of the picture of the subject under (a) state is shown.
Because imaging is by the picture of the subject of photographic lens 16 resulting wire on the intersecting lens O of two prism wedges up and down of separating prism 4, so can be equally on the identical position O ' of two prism wedges up and down (O "), obtain looking like.At this moment, shown in Fig. 4 (b), by eyepiece 17 in user's eyes 18, on roll off the production line (picture of subject) seem into a line.
Fig. 5 (a) is the separating prism of explanation under the situation of the picture (prefocusing) of the subject of separating prism the place ahead imaging wire and the accompanying drawing of the state of the picture of subject, and the example of diopter of the picture of the subject under (a) state (b) is shown.
In this case, because up and down prism wedge makes light to opposite mutually direction refraction, will see that picture is divided right and left shown in O ' (O ").
Fig. 6 (a) is the separating prism of explanation under the situation of the picture of separating prism rear imaging wire subject (back focuses on) and the accompanying drawing of the state of the picture of subject, and the example of diopter of the picture of the subject under (a) state (b) is shown.
In this case, as being offset along the direction opposite with the picture shown in Fig. 5.
Have, in Fig. 5 (a), α is the angle of wedge of separating prism 4 again, and fe is the focal length of eyepiece 17, and Δ p is minimum focusing fuzzy quantity, and δ p is the fractional dose of picture.
Like this, in separating prism, when prefocusing and back focused on, as offset direction difference up and down can be adjusted the sense of rotation of photographic lens usually to the less direction of the skew of picture.
Fig. 7 illustrates the relation of focal shift in first embodiment and vision signal skew, (a) is exterior view, and the focus deviation (defocus amount) of detection and the outboard profile of amount of bias (b) are shown.
Now, suppose with above-mentioned contrast mode, with focal adjustments on the sensitive surface of light accepting part 3.And, suppose that under this focus state insert separating prism 4 in the front of the sensitive surface of light accepting part 3, image space is displaced to the position of present sensitive surface 19 from sensitive surface 3.
At this moment, if detect by inserting the side-play amount of separating prism 4 resulting vision signals, then the side-play amount of this vision signal is equivalent to the biasing part (distance between separating prism face 4a and sensitive surface 3a) of defocus amount.Therefore, if with this as adjusted value, then can correctly carry out focal adjustments.This biasing part is because the required slit of mobile for example optical low-pass filter, protect image glass, separating prism etc. etc. produce.
According to above-mentioned adjusted value, drive photographic lens 16, making becomes the picture (with reference to Fig. 4 (b)) of a wire along the picture 14 (with reference to Fig. 6 (a)) of transverse direction skew, promptly focus on.Here, set the angle of wedge of separating prism, make this prism can not cover the light that incides light accepting part 3, and satisfy the desired accuracy of detection of focal adjustments.
Fig. 8 illustrates in order to detect the side-play amount of vision signal, only extracts the example of the signal of handling from vision signal out, and the picture of the back focusing on the separating prism on the valid pixel (a) is shown, and this valid pixel is made up of a plurality of pixels that are arranged on the transverse direction.Each pixel that (a) (b) is shown is the example of the pixel output in the absence of black and white (that is color filter).Each pixel that (a) (c) is shown is the example that the pixel of the Bayer arrangement of RGB primary colors is exported, and each pixel that (a) (d) is shown is other examples that the pixel of the Bayer arrangement of RGB primary colors is exported.
Have, the R among the figure, G, B represent to have redness respectively, the sensor of green, blue color filter again.
In addition, in the present embodiment, along transverse direction, promptly the sensor array that constitutes of the sensor of the horizontal direction pixel of arranging is considered as many along longitudinal direction with each pixel of light accepting part 3 (subject shooting is digital picture), i.e. the sensor arranged of vertical direction.
Shown in Fig. 8 (a), under the situation that the valid pixel 13 of two-dimensional arrangements is made of a plurality of black and white sensor arraies, the part of vision signal skew for example, is used shown in Fig. 8 (b) along two sensor arraies of longitudinal direction adjacency and is represented.In this case, extract picture up and down out, the side-play amount of vision signal is carried out the phase differential computing, obtain the focal position of picture with illustrated side-play amount.
Under the situation that the valid pixel 13 shown in Fig. 8 (a) is made of the sensor array of a plurality of colours, the picture 14 of video signal generating skew for example, is used along two sensor arraies of longitudinal direction arrangement as Fig. 8 (c) with (d) and to be represented.That is, because for example dispose the sensor array of identical color matching, so, utilize sensor array every the identical color matching of a row arrangement in order to compare picture up and down every row.Then, the side-play amount of Fig. 8 (c) and the vision signal that (d) illustrates is carried out the phase differential computing, obtain the focal position of picture.
Have, because assembly error and driving error, the position of division set positions on valid pixel 13 of separating prism 4 is also uncertain again.Therefore, extract the vision signal up and down of a plurality of row out, carry out focal adjustments according to the side-play amount of detected vision signal.
Next, with reference to Fig. 9 and Figure 10, action describes to the focal adjustments in first embodiment of this invention.
Fig. 9 is the accompanying drawing that the surveyed area in the valid pixel is shown, and Figure 10 is the process flow diagram that action describes to the focal adjustments in first embodiment.This action is by control part 9 controls.
In case enter focal adjustments action, at first obtain origin coordinates as the horizontal direction of the surveyed area in the valid pixel 13 20 at step S1.Meanwhile, obtain origin coordinates at step S2 as the vertical direction of above-mentioned surveyed area 20.
Next, obtain width W at step S3 as the horizontal direction of the surveyed area shown in Fig. 9 20.Then, obtain height 4h at step S4 as the vertical direction of above-mentioned surveyed area 20.Then, in step 5,0 of the begin column of the linear sensor of expression in the valid pixel 13 is set to n.
At step S6, obtain view data from the capable X of Y+2n to X+W.Then, at step S7, obtain view data from the X of Y+2 (n+1) to X+W.Obtain first row and the second capable view data in the even number line in the surveyed area 20 with this.Then,, carry out the phase differential computing, the result is write the storage area F (2n) of not shown storage part according to the view data that above-mentioned steps S6 and S7 obtain at step S8.
In addition, in step S9, obtain y+2n+1 capable in view data from x to x+w.Then, at step S10, obtain the view data from x to x+w in y+2 (n+1)+1 row.With this, obtain first row and second view data of going in the odd-numbered line in the surveyed area 20.Then,, carry out the phase differential computing, the result is write the storage area F (2n+1) of not shown storage part according to the view data that above-mentioned steps S9 and S10 obtain at step S11.
Next, increase progressively at step S12 after the value of n, in step S13, judge the value of n.Because obtain even number line and odd-numbered line each two row, the view data of four lines altogether respectively at above-mentioned steps S6, S7, S9, S10, so whether four lines has been reached height h judge, exactly all row in the surveyed area 20 (height 4h) are judged.Therefore, in this step S13, repeat above-mentioned steps S6～S13, till n=h.
Then, if obtain all view data in the surveyed area 20, just enter step S14, extraction does not become 0 F (*) in F (0)～F (2h).Here, if below specified amount, then be made as 0.But so-called specified amount is based on noise level and predefined value.The part of F (*)=0 is the part that does not have separated picture on separating prism, and the part of F (*)=0 is positioned at the division position that above-mentioned picture separates.
Therefore, in the value of step S15, calculate the driving direction and the drive amount of lens according to the F (*) that extracts out by above-mentioned steps S14.In step S16, according to driving direction of calculating and drive amount, drive photographic lens here, carry out focal adjustments.
Figure 11 is the accompanying drawing that is used to illustrate according to the error of the sloping portion of vision signal.
In Fig. 7 and Fig. 8, to only producing the vision signal skew in the top and the bottom of the division portion of clamping separating prism 4, and other parts do not produce basic kine bias under the situation of skew and move and be illustrated.But, only almost do not have in the reality to produce the skew of vision signal and other parts do not produce the situation of skew in the top and the bottom of the division portion of clamping separating prism 4.Therefore,,, produce the example of the situation that kine bias moves obliquely, describe clamping above-mentioned division portion with reference to Figure 11 and Figure 12.
Figure 12 carries out the process flow diagram that the action of focal adjustments describes to the error that the sloping portion of considering by vision signal causes.This action is by control part 9 controls.
In case enter the focal adjustments action, at first the origin coordinates x of the horizontal direction of surveyed area 20 in step S21 obtains as valid pixel 13.Simultaneously, obtain origin coordinates y at step S22 as the vertical direction of above-mentioned surveyed area 20.
Next, obtain the width w of horizontal direction as surveyed area 20 shown in Figure 9 at step S23.Obtain height 4h at step S24 then as the vertical direction of above-mentioned surveyed area 20.Then, step S25 n is made as the sensor array of expression in the valid pixel 13 begin column 0.
In step S26, obtain y+2n capable in view data from x to x+w.Then, at step S27, obtain the view data from x to x+w in y+2 (n+1) row.With this, obtain first row and second view data of going in the even number line in the surveyed area 20.Then,, carry out the phase differential computing, the result is write the storage area F (2n) of not shown storage part from the view data that obtains by above-mentioned steps S26 and S27 at step S28.
In addition, in step S29, obtain y+2n+1 capable in view data from x to x+w.Then, at step S30, obtain the view data from x to x+w in y+2 (n+1)+1 row.With this, obtain first row and second view data of going in the odd-numbered line in the surveyed area 20.Then,, carry out the phase differential computing, the result is write the storage area F (2n+1) of not shown storage part according to the view data that obtains by above-mentioned steps S29 and S30 at step S31.
Next, increase progressively at step S32 after the value of n, in step S33, judge the value of n.Because obtain even number line and each two row of odd-numbered line difference at above-mentioned rapid S26, S27, S29, S30, the view data of four lines so whether four lines has been reached height h is judged altogether, exactly all row in the surveyed area 20 (highly 4h) is judged.Therefore, in this step S33, repeat above-mentioned steps S26～S33, till n=h.
Then,, just enter step S34, from F (0)～F (2h), extract maximal value and minimum value out if obtain all view data in the surveyed area 20.
Next, in step S35, calculate the maximal value that in above-mentioned steps S34, obtains and the intermediate value of minimum value.
Then, in step S36, obtain the mean value of the value more than the intermediate value among above-mentioned F (0)～F (2h), write the storage area F of above-mentioned storage part.Then, obtain mean value, write the storage area Δ F of above-mentioned storage part less than the value of the intermediate value among above-mentioned F (0)～F (2h) at step S37.
In step S38,, calculate the driving direction and the drive amount of lens according to the value of poor (the F-Δ F) of two mean values that obtain by above-mentioned steps S36 and S37.With this, at step S39, drive photographic lens according to driving direction of calculating and drive amount, carry out focal adjustments.
Next, the focal adjustments action to the rotation error of having considered separating prism describes.
As mentioned above, separating prism 4 can plug on light accepting part 3 by the 3rd drive division 8.Here, separating prism 4 not necessarily correctly is configured on the valid pixel 13 of light accepting part 3.
Figure 13 is the accompanying drawing that is used to illustrate the rotation error of such separating prism.
Owing to assembly error, under the situation of the direction of the pixel column of light accepting part and the cleavage direction of separating prism generation error, adopt this countermeasure.
Now, shown in Figure 13 (a), under the situation of the division portion of separating prism 4 with respect to 14 inclinations of two pictures, the part of the vision signal of adjacent sensor array can cause producing following misunderstanding: as 14 skew has taken place in the reality, but shown in Figure 13 (b), there is not the signal of skew as obtaining three image signals.
Therefore, get the part of vision signal of two sensor arraies of row every appointment (being two row in this example).The part of the vision signal that Figure 13 (c) expression obtains like this can be seen about generation being offset.
Next, with reference to the process flow diagram of Figure 14, the focal adjustments action of the rotation error of having considered separating prism is described.This action is controlled by control part 9.
In case enter the focal adjustments action, at first the origin coordinates x of the horizontal direction of surveyed area 20 in step S41 obtains as valid pixel 13.Simultaneously, obtain origin coordinates y at step S42 as the vertical direction of above-mentioned surveyed area 20.And then in the width W that obtains at step S43 as the horizontal direction of the surveyed area shown in Fig. 9 20.
Then, obtain amount of bias k at step S44 as the error countermeasure of mechanical system (the 3rd drive division 8).Wherein, suppose that this amount of bias k is an even number.In addition, in step S45, obtain height 4h+k as the vertical direction of above-mentioned surveyed area 20.And then step S46 n is made as the sensor array of expression in the valid pixel 13 begin column 0.
In step S47, obtain y+2n capable in view data from x to x+w.Then, at step S48, obtain the view data from x to x+w during y+2 (n+1)+k is capable.With this, obtain the view data in the even number line in the surveyed area 20.Then,, carry out the phase differential computing in the view data that obtains according to above-mentioned steps S47 and S48, the result is write the storage area F (2n) of not shown storage part at step S49.
In addition, in step S50, obtain y+2n+1 capable in view data from x to x+w.Then, use step S51, obtain the view data from x to x+w during y+2 (n+1)+1+k is capable.With this, obtain the view data in the odd-numbered line in the inspection area 20.Like this,, carry out the phase differential computing, the result is write the storage area F (2n+1) of not shown storage part from the view data that obtains by above-mentioned steps S50 and S51 at step S52.
Next, increase progressively at step S53 after the value of n, in step S54, judge the value of n.Because above-mentioned steps S47, S48, S50, S51 obtain even number line and odd-numbered line each two row respectively, whether the view data of four lines has reached height h so judge four lines altogether, exactly all row in the surveyed area 20 (height 4h) is judged.Therefore, in this step S54, repeat above-mentioned steps S47～S54, till n=h.
Like this, if obtain all view data in the surveyed area 20, just enter step S55, extraction does not become 0 F (*) in F (0)～F (2h).Then, in step S56,, calculate the driving direction and the drive amount of lens according to the value of the F (*) that extracts out by above-mentioned steps S55.
Have, F (*) then is made as 0 if below specified amount again.Wherein, so-called specified amount is based on the predefined value of noise level, and the part that has produced operation mistake is excluded.
According to driving direction of calculating like this and drive amount, drive photographic lens at step S57, carry out focal adjustments.
In addition,,, then vision signal can't be clearly obtained, the side-play amount of vision signal can not be detected if focus deviation (defocus amount) is excessive though do not illustrate.In this case, preferably take following countermeasure.One general in contrast mode and phase differential mode uses, as the lens inspection (scan) of known technology.(defocus amount) is very big even another is focus deviation, also can dwindle optical system, makes that clearly obtaining vision signal detects.
Have again, in above-mentioned Fig. 1,, be not limited thereto, also can move this separating prism with plugging with respect to light accepting part 3 though separating prism is moved along the arrow A direction.
Next, second embodiment to this invention describes.
In the above-described first embodiment, though separating prism 4 can be configured on the sensitive surface of light accepting part 3 by first drive division 6 with plugging, in the time of in second embodiment, also can switching AF and the light path in when photography by deflection component.
Figure 15 illustrates the structure of second embodiment of the present invention, and the block scheme of the basic structure of automatic focus-regulating device is shown.
In Figure 15, be directed into light accepting part 3 through optic 2 and deflector 11 from the photography light beam of subject 1.Above-mentioned light accepting part 3 and above-mentioned optic 2 are respectively by first drive division 6 and second drive division 7, by control part 9 drive controlling.
Configuration can be carried out the deflector 11 that light path is switched between above-mentioned optic 2 and light accepting part 3.Because this deflector 11 by the 3rd drive division 3, by control part 9 controls, so insert when AF in the light path, is kept out of the way outside this light path when shooting.
Figure 16 is the exterior view that the position of the separating prism 4 on the light accepting part 3 is shown.
Use light area when like this, the use light area when AF is with photography is different.One of them direction of the orientation of pixel (vertical or horizontal) probably equals the cleavage direction of separating prism.Have, the separating prism of each embodiment is not limited thereto so long as have the optical component of said function and get final product again.
In addition, in Figure 16,, can there be inactive pixels though be inactive pixels (OB (=Optical Black) pixel) between the valid pixel yet.
In addition, in this second embodiment, though not shown, amount of bias be since deflector 11 have or not the poor of caused optical path length.
In addition, adjusted value can be got drive amount poor of the optic when adopting the contrast mode and utilizing separating prism.
According to aforesaid the present invention, a kind of automatic focus-regulating device can be provided, it can not make body volume become big when obtaining focus point fast.
Claims (7)
1. an automatic focus-regulating device is characterized in that, comprises with lower member:
Light receiving component, its subject shooting is digital picture;
Optics, it is used for the light from subject is directed to above-mentioned light receiving component;
Separating prism, it can move between the position outside the light path of the position of the sensitive surface front of the above-mentioned light receiving component in the light path of above-mentioned optics and above-mentioned optics;
Control assembly, it detects the side-play amount based on the vision signal of the light by above-mentioned separating prism, and according to this side-play amount, carries out the focal adjustments of above-mentioned optics.
2. automatic focus-regulating device according to claim 1, it is characterized in that, will be parallel with the cleavage direction of above-mentioned separating prism, have the two row sensitive device arrays at predetermined interval as one group in the above-mentioned light receiving component, side-play amount to a plurality of groups above-mentioned vision signals detects, and, carry out the focal adjustments of above-mentioned optics according to these a plurality of side-play amounts.
3. an automatic focus-regulating device is characterized in that, comprises with lower member:
Light receiving component, its subject shooting is digital picture;
Optics, it is used for the light from subject is directed to above-mentioned light receiving component;
Separating prism, it is arranged on the light path position outward of the sensitive surface front of above-mentioned light receiving component, above-mentioned optics;
Deflection component, it can enter or withdraw from the light path of above-mentioned optics, and the part from the light beam of subject is directed to above-mentioned separating prism;
Control assembly, it detects the side-play amount based on the vision signal of the light by above-mentioned separating prism, and according to this side-play amount, carries out the focal adjustments of above-mentioned optics.
4. automatic focus-regulating device according to claim 3, it is characterized in that, will be parallel with the cleavage direction of above-mentioned separating prism, go up following sensitive device array in the above-mentioned light receiving component as one group, side-play amount to a plurality of groups above-mentioned vision signals detects, according to these a plurality of side-play amounts, carry out the focal adjustments of above-mentioned optics.
5. automatic focus-regulating device according to claim 4 is characterized in that, the focal adjustments of carrying out above-mentioned optics makes the side-play amount of all above-mentioned a plurality of vision signals all in predetermined scope.
6. automatic focus-regulating device according to claim 5, it is characterized in that, above-mentioned predetermined scope is: utilize based on the vision signal of the above-mentioned light receiving component of the light by above-mentioned separating prism not, after adopting the contrast mode to carry out the focal adjustments of above-mentioned optics, based on the mean value of the side-play amount of above-mentioned a plurality of vision signals of the light by above-mentioned separating prism; And this automatic focus-regulating device has the memory unit of this mean value being stored preservation as adjusted value.
7. automatic focus-regulating device according to claim 3, it is characterized in that, will be parallel with the cleavage direction of above-mentioned separating prism, have the two row sensitive device arrays at predetermined interval as one group in the above-mentioned light receiving component, side-play amount to a plurality of groups above-mentioned vision signals detects, and, carry out the focal adjustments of above-mentioned optics according to these a plurality of side-play amounts.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP142699/2002 | 2002-05-17 | ||
| JP2002142699 | 2002-05-17 |
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| CN1460888A CN1460888A (en) | 2003-12-10 |
| CN1260612C true CN1260612C (en) | 2006-06-21 |
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| CN03136023.8A Expired - Fee Related CN1260612C (en) | 2002-05-17 | 2003-05-16 | Automatic focus regulator |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR101415872B1 (en) * | 2007-09-14 | 2014-07-11 | 삼성전기주식회사 | Method and apparatus for auto focusing of image capturing |
| JP5297222B2 (en) * | 2009-02-17 | 2013-09-25 | キヤノン株式会社 | Focus adjustment device and focus adjustment method |
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