CN1218160C - Regulator and regulation method of distometer - Google Patents

Abstract

To provide an adjusting device for range finder capable of precisely adjusting an active type range finder and reducing its size without impairing regulation precision. SOLUTION: When the range finder is adjusted for long-range measurement by means of this adjusting device 120, signal light, which is supposed to be reflected at an imaginary long-range third 112 set in a long-range position, is lighted in a light quantity adjusted condition by means of a long-range IRED 106 at a point (a) positioned by computing in a close-range first chart 107, and the signal light is received by means of a PSD 105 in the range finder for measuring a distance. According to this result, an inclination coefficient of a conversion line is found for finding an inverse number 1/L of an object distance and writing it in an EEPROM 101b inside a camera 101. In distance measurement by the camera 101, the inclination coefficient is read from the EEPROM 101b, and the object distance on the long-range side is found.

Description

The adjusting gear of distance measuring equipment

Technical field

The present invention relates to adjusting gear and method of adjustment that the deviation of the range-finding optical system of the distance measuring equipment of active mode and signal processing circuit etc. is adjusted.

Background technology

So-called initiatively (active) mode is meant: have light projector device and the infrared rays receiver of accepting by the flashlight of above-mentioned subject reflection to subject superframe signal light, detect the mode of subject distance according to the output of above-mentioned infrared rays receiver.

In the past, as the adjusting gear that the deviation of the optical system of the distance measuring equipment that carries out active mode and signal processing circuit etc. is adjusted, had the open communique spy of Jap.P. and opened the device that is disclosed in the flat 2-208508 communique.In order to carry out miniaturization, this device by the light projector device different with light projector device built-in in distance measuring equipment, goes up the projection flashlight to adjusting with figure under the situation that the distance measuring equipment of imaginary subject distance is adjusted.By with this projection light position as from the light path of the flashlight of actual range and the position of intersecting point of closely adjusting with figure, obtain imaginary ranging data, adjust.

Open in the method that is disclosed in the flat 2-208508 communique above-mentioned spy, adjust error and become big, can not carry out the problem that high precision is adjusted and exist.

Summary of the invention

In order to address the above problem, the present invention relates to the adjusting gear of distance measuring equipment, can not make the high-precision adjusting of carrying out the distance measuring equipment of active mode under the situation of adjusting deterioration in accuracy, and, can seek miniaturization.

The adjusting gear of distance measuring equipment of the present invention, have light projector device and the infrared rays receiver of accepting by the flashlight of above-mentioned subject reflection to subject superframe signal light, deviation to the optical system of the distance measuring equipment of obtaining the subject distance according to the incoming position of the flashlight on the light receiving position detecting element that constitutes above-mentioned infrared rays receiver and signal processing circuit etc. is adjusted, it is characterized in that

Closely the adjustment of side is to carry out with the actual data of finding range of distance of figure according to arrival being configured in closely adjusting on the above-mentioned adjusting gear, the adjustment of remote side is to carry out according to the data of using simulating signal light to find range, and this simulating signal only comes comfortablely to use on the intersection point of figure than closely adjusting to adjust at a distance with the light path of the flashlight of figure and adjustment closely with the figure imaginary imagination of preset distance far away.

Described adjusting gear is characterized in that, the light intensity of above-mentioned simulating signal light is the light quantity that inferred by the light light quantity during from the adjustment of side closely, and it is adjusted to above-mentioned imagination adjusted at a distance and is subjected to the light light quantity when finding range with figure.

Described adjusting gear is characterized in that, the light source that above-mentioned simulating signal light takes place is arranged on above-mentioned closely the adjustment with the movable pointolite on the figure.

Described adjusting gear is characterized in that, the light source that above-mentioned simulating signal light takes place is arranged on above-mentioned closely the adjustment with a plurality of pointolites on the figure.

Described adjusting gear is characterized in that, the light source that above-mentioned simulating signal light takes place is gone up projection simulating signal light to above-mentioned closely the adjustment with figure, and is different with the light projector device of above-mentioned distance measuring equipment, the light projector device that launching position is variable.

Described adjusting gear, it is characterized in that, closely adjusting with the position on the figure of above-mentioned simulating signal light taken place, and is according to when sending the ranging data of simulating signal light launching position detection when finding range with flashlight with the reference position on the figure and calculate from closely adjusting.

Description of drawings

Fig. 1 is the block scheme that constitutes of the camera of the adjusting gear of the expression first embodiment of the present invention and the built-in distance measuring equipment adjusted by above-mentioned adjusting gear;

Fig. 2 be expression first embodiment that is used for illustrating above-mentioned Fig. 1 adjusting gear method of adjustment camera projection/connect light accepting part and adjust with closely adjusting with figure (チ ヤ one ト) and the remote mode chart of adjusting with the allocation position of figure of imagination;

Fig. 3 is the figure of the relation of the incident luminous point centre of gravity place on the PSD (light receiving position detecting element) in the adjusting gear of above-mentioned first embodiment of expression and the inverse of subject distance;

Fig. 4 is the conversion characteristics line chart of relation of the inverse of the AF data obtained of the adjusting gear of first embodiment of expression by above-mentioned Fig. 1 and subject distance;

Fig. 5 comprises the adjustment of adjusting gear of first embodiment that is used for above-mentioned Fig. 1 with the figure of an example of the I/F circuit of the driving circuit of IRED;

Fig. 6 is the process flow diagram that the adjustment in the adjusting gear of first embodiment of above-mentioned Fig. 1 is handled;

Fig. 7 is the block scheme that constitutes of the camera of the adjusting gear of the expression second embodiment of the present invention and the built-in distance measuring equipment adjusted by above-mentioned adjusting gear;

Fig. 8 is the block scheme that constitutes of the camera of the adjusting gear of the expression third embodiment of the present invention and the built-in distance measuring equipment adjusted by above-mentioned adjusting gear;

Fig. 9 is used to illustrate the initiatively mode chart of the principle of the range of triangle mode of one of distance measuring method of conduct;

Figure 10 is the family curve of the relation of the AF data of the reality in the above-mentioned distance measuring equipment shown in Figure 9 of expression and subject distance.

The specific embodiment of invention

At first, as one of distance measuring equipment of active mode, use the mode chart of principle of the expression range of triangle of Fig. 9 to come the range of triangle mode is described.

As shown in Figure 9, sensitive lens has principal point 4, optical axis 3 and focal distance f.The distance of the IRED1 of projection element and sensitive lens optical axis 3 is base length S.Distance from the sensitive lens optical axis 3 on the PSD2 of photo detector to the centre of gravity place of signal luminous point is t, and the distance from the remote side of PSD2 to sensitive lens optical axis 3 is t ∞.Output current from the closely side of PSD2 is In.Output current from the remote side of PSD2 is If.The subject distance is L.

In above-mentioned distance measuring equipment, pass through the light projector lens to subject 5 superframe signal light from IRED1, reflected by subject 5.The above-mentioned flashlight that reflects by sensitive lens the lens axis on the sensitive surface of distance PSD2 3 apart from the position of t on imaging be the signal luminous point.From the centre of gravity place corresponding electric current of this PSD2 output with above-mentioned signal luminous point.

Therefore, as can be seen from Figure 9: the focal distance f of base length s, sensitive lens, subject distance L, to from the signal luminous point centre of gravity place of the sensitive lens optical axis 3 on the PSD2 apart from t between, the relation of following formula (11) is set up:

L/s＝f/t ……(11)

In above-mentioned formula (11), base length s, focal distance f are known value, therefore, if obtain apart from t, just can obtain the subject distance L.Generally, the overhang z of the photographic lens of camera has the reciprocal proportional tendency with the subject distance L.Therefore, the formula that has the above-mentioned formula of distortion (11):

1/L＝t/(s×f) ……(12)

Thus, calculate the overhang z of photographic lens.

The value of above-mentioned overhang z is carried out simulation trial by two output current In, If to PSD2 and is obtained.Specifically, the technology by known log-compressed waits the In/ (In+If) that obtains as the AF data.From recently the obtaining of the length of PSD2 and above-mentioned output current (t+t ∞).If deduct t ∞ from the value of this (t+t ∞), just can obtain value apart from t, and, can calculate overhang z.

The focal distance f of above-mentioned base length s, sensitive lens, has deviation apart from t ∞ owing to the outward appearance and the assembly precision of parts from the remote side of PSD2 to sensitive lens optical axis 3.Therefore, when the manufacturing of camera, measure the some position in the subject distance more than 2 apart from m, obtain the straight line arithmetic expression of expression subject distance and the relation of distance tn.This straight line arithmetic expression is stored in each camera in the nonvolatile memories such as EEPROM, when reality is found range, uses this straight line arithmetic expression to calculate the 1/L reciprocal of subject distance.

In the distance measuring equipment of reality, because the minimizing of the signal light quantity on remote, such as in shown in the family curve of the relation of actual AF data and the subject distance of expression Figure 10, the relation of the inverse of subject distance L and AF data is not desirable straight line Pa0.Along with the variation of above-mentioned signal light quantity, the straight line of expression above-mentioned relation departs from from above-mentioned straight line Pa0, is changed to curve Pb0 or Pc0.This variation has produced the adjustment error.

Use accompanying drawing to come embodiments of the invention are described below.

Fig. 1 is the block scheme that constitutes of the camera of the adjusting gear of the expression first embodiment of the present invention and the built-in distance measuring equipment adjusted by above-mentioned adjusting gear.Fig. 2 be expression first embodiment that is used for illustrating above-mentioned Fig. 1 adjusting gear method of adjustment camera projection/connect light accepting part and adjust with closely adjust with figure and imagination remote adjust with figure (the mode chart of allocation position.Fig. 3 is the figure of the relation of the incident luminous point centre of gravity place on the PSD (light receiving position detecting element) in the adjusting gear of above-mentioned first embodiment of expression and the inverse of subject distance.Fig. 4 is the conversion characteristics line chart of relation of the inverse of the AF data obtained of the adjusting gear of first embodiment of expression by above-mentioned Fig. 1 and subject distance.Fig. 5 comprises the adjustment of adjusting gear of first embodiment that is used for above-mentioned Fig. 1 with the figure of an example of the I/F circuit of the driving circuit of IRED.

The camera 101 of built-in above-mentioned distance measuring equipment has: photographic lens lens barrel 101d; CPU 101a carries out the control of camera, and, carry out the control of distance measuring equipment; EEPROM101b, storage data relevant with the range finding of adjusted value etc. be used for the data that camera is controlled; As IRED (infrared light-emitting component) 104 of the light projector device of the key element that constitutes distance measuring equipment and the light projector lens 102 of range-finding optical system; As PSD (the light receiving position detecting element) 105 of infrared rays receiver and the sensitive lens 103 of range-finding optical system; AFIC101c as the signal processing circuit that is used to find range.Above-mentioned photographic lens lens barrel 101d, above-mentioned light projector lens 102 and sensitive lens 103 are in the front of camera 101, are configured on the not overlapped position.

In the distance measuring equipment of camera 101, the flashlight that sends from above-mentioned IRED104 throws to subject by light projector lens 102.Flashlight by the subject reflection is taken into by sensitive lens 103, and imaging is the signal luminous point on PSD105.On PSD105, be taken into range finding with the corresponding current value of centre of gravity place of the signal luminous point of institute imaging and handle and use AFIC101c, be exported to CPU 101a as the AF data.CPU 101a adjusts data according to above-mentioned AF data and with reference to the range finding of storage in advance in EEPROM 101b, obtains the subject distance by computing.

Above-mentioned adjusting gear 120 is the devices that are used for adjusting the deviation of range-finding optical system (light projector lens 102, sensitive lens 103 etc.) in the distance measuring equipment that is built in above-mentioned camera 101 and distance measuring signal treatment circuit (AFIC101c) etc.This adjusting gear 120 has: closely adjust with first chart 107, be arranged on from the principal point of the sensitive lens 103 of camera 101 and leave on the position of distance L 1; Closely adjust with second chart 108, be arranged on from the principal point of the sensitive lens 103 of camera 101 and leave on the position of distance L 2; Adjust with PC (personal computer) 110, camera 101 is carried out the adjustment of distance measuring equipment and the computing of adjusted value etc.; The remote adjustment used IRED106, when remote the adjustment, to the light accepting part projective module analog signal light of camera 101; Veil 112 when closely adjusting, moves to the front of above-mentioned light projector lens 102, and shelter from flashlight from above-mentioned IRED104, when remote the adjustment, retreat from the front of above-mentioned light projector lens 102, forwards throw flashlight from above-mentioned IRED104; I/F circuit 109, as by come self-adjusting with the signal of PC110 carry out first chart 107 driving up and down (driving of the A direction in Fig. 1), remote adjust with drive about IRED106 (driving of the B direction in Fig. 1), veil 112 about drive the control device of (driving of the C direction in Fig. 1) and light emitting control etc.; Be used to drive the power supply unit 111 of camera.

And above-mentioned veil 112 is not limited on left and right directions and drives, and also can be to use the shutter of liquid crystal display cells etc.

Above-mentioned remote adjustment IRED106 can send simulating signal light by adjusting the pointolite that is bearing in movably on the position, the left and right sides indicated with PC 110 on first chart 107 on this shift position.Detect the input point position of above-mentioned simulating signal light by PSD105, and, its amount of emitted light detected.This luminous light intensity is controlled so as to and considers that to adjust the light that is reflected with the 3rd chart at a distance by imagination described later identical.

Above-mentioned I/F circuit 109 has: carrying out shown in Figure 5 adjusted the IRED driver 120 with the break-make of IRED106 at a distance; Adjust variable resistor 121 at a distance with the drive current restriction of IRED106, the resistance value of regulating variable resistor 121 is adjusted the current control circuit 122 of the control of the drive current of using IRED106 at a distance, connect and disconnect the emission control circuit 123 that IRED driver 120 is adjusted the light emitting control of using IRED106 at a distance, carry out moving up and down of first chart 107, remote chart/IRED mobile control division 124 of adjusting with the move left and right of IRED106 and veil 112.

Wherein, come the distance of the incident luminous point centre of gravity place on PSD105 relation and the remote relation of putting with shift position and the incident light point detecting position of IRED106 of adjusting with the inverse of subject distance L described by Fig. 2, Fig. 3.

As shown in Figure 2, PSD105 exports and passes through the corresponding electric current of centre of gravity place of each signal luminous point of 103 imaging of sensitive lens.And, closely adjust to be arranged on from the principal point 114 of the sensitive lens 103 of camera 101 and leave on the position of distance L 1 with first chart 107.Closely adjust to be arranged on from the principal point 114 of the sensitive lens 103 of camera 101 and leave on the position of distance L 2 with second chart 108.Imaginary remote adjustment is the charts that are used to adjust at a distance with the 3rd chart 112, in fact do not exist, but being assumed to is than distance L 1, L2 distance far away, is set on the position of the distance L 3 of the principal point 114 of the sensitive lens 103 of camera 101.And, the optical axis of sensitive lens 103 as optical axis 113.

Under situation about by IRED104 and light projector lens 102 flashlight being incident upon on first chart 107, by sensitive lens 103 imaging the centre of gravity place of the signal luminous point on the PSD105 be positioned at apart from the remote side of PSD105 apart from t1 on.And, under situation about by IRED104 and light projector lens 102 flashlight being incident upon on second chart 108, by sensitive lens 103 imaging the centre of gravity place of the signal luminous point on the PSD105 be positioned at apart from the remote side of PSD105 apart from t2 on.And, when being assumed to when flashlight being incident upon on imaginary the 3rd chart 112 by IRED104 and light projector lens 102, by sensitive lens 103 imaging the centre of gravity place of the signal luminous point on the PSD105 be positioned at apart from the remote side of PSD105 apart from t3 on.

Become the position on the optical axis 113 of sensitive lens 103 of imaging surface of PSD105 from the centre of gravity place of the signal luminous point of infinity subject, be positioned at ∞ apart from t from the remote side of PSD105.And, become the focal distance f of sensitive lens 103.

Pressing characteristic straight line P0 shown in Figure 3 with each of the centre of gravity place of signal luminous point on the corresponding PSD105 of above-mentioned each subject distance L apart from relation of the inverse of t and each subject distance L changes like that point-blank.

On the other hand, as shown in Figure 2, when being assumed to when flashlight being incident upon on imaginary the 3rd chart 112 by IRED104 and light projector lens 102, between the remote side of the centre of gravity place of above-mentioned signal luminous point and PSD105 apart from t3, can by by between the remote side of the centre of gravity place of the signal luminous point on the PSD105 that reflected light produced of above-mentioned first, second chart 107,108 and PSD105 apart from t1, t2; To the distance L 1 of above-mentioned first, second chart 107,108, L2 and to the distance L 3 of imaginary the 3rd chart (チ ヤ one ト) 112 and calculate with formula described later (15).

And, as shown in Figure 2, the track of the flashlight of IRED104 imaging flashlight on PSD105 and intersection point that first chart 107 intersects by 112 reflections of imaginary the 3rd chart as a point.This a point becomes the position of the simulating signal light on first chart 107 that produces when adjusting at a distance.

And, at the optical axis 113 of the sensitive lens 103 on first chart 107 and the point between the above-mentioned a point as b point and c point.This b point and c point are the reference positions that the flashlight that simulating signal light light projector position probing uses takes place in order to calculate the position on first chart 107 that above-mentioned simulating signal light takes place.

Therefore, from the above-mentioned b point superframe signal light time, by the sensitive lens 103 imaging distance between the remote side of the centre of gravity place of the signal luminous point on the PSD105 and PSD105 is become apart from tb when on first chart 107, making IRED106 move to the b point.And, from the above-mentioned c point superframe signal light time, by the sensitive lens 103 imaging distance between the remote side of the centre of gravity place of the signal luminous point on the PSD105 and PSD105 is become apart from tc when on first chart 107, making IRED106 move to the c point.

The a point of reference position during above-mentioned remote adjust, first chart 107 and the distance * a between the above-mentioned c point can be by the distance * b between above-mentioned b point and the c point, calculating apart from t3, tb, tc formula described later (16) as the each point centre of gravity place of the incoming position of above-mentioned PSD105.As described later, when remote adjustment, make remote adjustment move to this a point and come luminous with IRED106.Luminous by this, finish the such adjustment of aftermentioned to remote range finding.

The adjusting gear 120 that use has above-mentioned formation appends the adjustment that following order is carried out the distance measuring equipment of above-mentioned camera, that is:

(1), at first, flashlight is projected respectively from the IRED104 of camera 101 be positioned at subject distance L 1, first chart 107 on the L2, on second chart 108, PC110 measures light quantity data I 1, the I2 as the light quantity output signal (current signal) of the output terminal of PSD105.

When closely adjusting with the 108 upslide light time of second chart to above-mentioned, by the control of I/F circuit 109, mobile above-mentioned first chart 107 becomes the appearance that the flashlight from IRED104 is not blocked.And, when light projector, veil 112 is retreated from the optical axis of light projector lens 102.

And, PC110 by following formula (13), formula (14) come from AFD1, AFD2 as the AF data calculate incoming position (some centre of gravity place) to the flashlight of PSD105 apart from t1, t2 (with reference to Fig. 2).That is:

t1＝t0×AFD1/AFDmax……(13)

t2＝t0×AFD2/AFDmax……(14)

Wherein, above-mentioned is the length (with reference to Fig. 2) of the light accepting part of PSD1 05 apart from t0, and AFDmax represents the .AF data maximal value (dynamic range) of PSD105.And, obtain according to light quantity output signal I1, I2 I1/ (I1+I2) or I2/ (I1+I2) as AFD1, the AFD2 of AF data.

(2) the inverse of subject distance L and as to the incoming position of the some centre of gravity place of the flashlight of PSD105 apart from t between, utilization has such proportionate relationship shown in Figure 3, PC110 use by above-mentioned (1) incoming position of measuring apart from t1, t2, and calculate the remote incoming position t3 that adjusts when throwing flashlight on the 3rd chart 112 of imagination on being arranged in the subject distance L of representing by Fig. 2 dotted line 3 to the flashlight of PSD105 by following formula (15).

t3＝(t1-t2)/(1/L1-1/L2)×(1/L3)

+(t2/L1-t1/12)/(1/L1-1/L2) ……(15)

(3) under the state of the front of the light projector lens 102 that shelter from camera 101 with veil 112, PC110 makes the IRED104 that adjusts with PC110 luminous, make simultaneously on the position (with reference to Fig. 2) that remote adjustment order with the c of IRED106 on first chart 107 luminous, measure incoming position apart from tc.

(4) under the state of the front of the light projector lens 102 that shelter from camera 101 with veil 112, PC110 makes the IRED104 that adjusts with PC110 luminous, it is simultaneously remote that to adjust the position (with reference to Fig. 2) of order with the b of IRED106 on first chart 107 upward luminous, measure incoming position apart from tb.

(5) PC110 use incoming position apart from the distance * b between t3, tb, tc and b-c point and the a-c dot spacing of calculating the distance of ordering by following formula (16) as a of remote analog light source position when adjusting the remote adjustment of using IRED106 from * a.That is:

In Xa=L1 * (t-tc)/f, substitution f=(tb-tc) * L1/Xb,

Xa＝Xb×(t3-tc)/(tb-tc) ……(16)

Thus, obtain Xa.That is, closely adjusting with the position on the figure of simulating signal light being taken place calculates according to the ranging data when adjustment is closely sent flashlight that simulating signal light light projector position probing uses and found range with the reference position on the figure.

(6) PC110 uses by (2) the light quantity data I 1 measured or I2 and also calculates the light quantity data I 3 of adjusting the light quantity output signal of usefulness as remote by following formula (17) or (17 '):

I3＝11×(L1/L3) ² ……(17)

I3＝12×(L2/L3) ² ……(17’)

(7) adjust by PC110 and be positioned at remote adjustment that a orders luminous quantity, so that incide signal light quantity on the PSD105 for above-mentioned (a 6) I3 that obtains with IRED106.That is, make the resistance value of the variable resistor 121 of the I/F circuit 109 among Fig. 5, change, thus, regulate the luminous quantity of above-mentioned IRED106 by current control circuit 122.When the adjusting of the luminous quantity that does not carry out this IRED106, become the value on the extended line of straight line Pa1 of Fig. 4 as the AFD3 of the AF data of the remote side that is produced with the imaginary chart 112 measured of (8) described later item, become big with the error of the AF data of reality on curve Pb1.Therefore, the adjustment of the luminous quantity by carrying out above-mentioned IRED106, as the AFD3 of the AF data of the remote survey of Fig. 4 by on the approximate adjustment straight line Pc1 that is in close proximity to curve Pb1.And the adjusting of the luminous quantity of above-mentioned IRED106 is not limited in the method for using driving circuit shown in Figure 5, also can use other driving circuits and optical light filter etc.

(8) under the state of the front of the light projector lens 102 that sheltered from camera 101 with veil 112, PC110 makes the IRED104 of camera 101 luminous, simultaneously, make the remote adjustment that a orders luminous, measure the AF data AFD3 of slope of the adjustment straight line Pc1 of the remote survey that is used to calculate Fig. 4 with IRED106.At this, resemble the IRED104 that carries out camera 101 above-mentioned luminous be condition in order to make along with the realistic range finding of conditions such as the fluctuation of the interior power supply of the luminous camera 101 of IRED104 and noise.

Use the AF data AFD1, AFD2, the AFD3 that measure to the order of (8) item by above-mentioned (1) item, PC110 calculates as the closely side of adjusted value and data conversion straight line Pa1, slope coefficient AFK1, the AFK2 of Pc1 of the 1/L reciprocal of remote AF data of surveying and subject distance by following formula (18), formula (19):

AFK1＝(1/L1-1/L2)/(AFD1-AFD2) ……(18)

AFK2＝(1/L2-1/L3)/(AFD2-AFD3) ……(19)

The AFD2 of above-mentioned AF data and slope coefficient AFK1, AFK2 write in the presumptive address of the nonvolatile memories such as EEPROM 101b that are built in the camera 101 by PC110.And, in the distance measuring equipment of the camera 101 of reality, be to use the AFD2 of the AF data that distance L 2 are set, produced by second chart of above-mentioned slope coefficient AFK1, AFK2 and second chart 108 to carry out to the conversion of the 1/L data reciprocal of subject distance from the AFD of the AF data measured.That is, the value of the AFD by said determination AF data is selected following formula (20) or formula (21), the 1/L reciprocal that calculates the subject distance.

That is, in side closely, when AFD 〉=AFD2,

1/L＝AFK1×(AFD-AFD2)+1/L2 ……(20)

In remote survey, when AFD＜AFD2,

1/L＝AFK2×(AFD-AFD2)+1/L2 ……(21)

Thus, calculate the 1/L reciprocal of subject distance.

And in the above description, the remote adjustment is arranged on first chart 107 with IRED106, still, also can be arranged on second chart 108.And, in the above description, be light quantity data I 1, I2 from first chart 107, second chart 108, remote adjustment when obtaining the AF data AFD3 that measures imaginary chart 112 luminous quantity of IRED106, but this luminous quantity can be the fixed value of the distance of having considered imaginary chart 112 in advance, emissivity etc.And, in the above description, imagined an imaginary chart 112, become two straight line Pa1, the Pc1 of broken line that are used for obtaining the 1/L reciprocal of subject distance by adjusting to obtain like that by shown in Figure 4 from the AF data, but, also it is contemplated that a plurality of imaginary charts, obtain the adjustment of the straight line more than three.

The adjustment order of the distance measuring equipment of the camera 101 in the adjusting gear 120 of above-mentioned first embodiment is described below by the process flow diagram of Fig. 6.

This processing is undertaken by the control of PC110.At first, in S101, by the control of PC110, the CPU 101a of process camera 101, finds range to first chart, 107 superframe signal light from IRED104.PC110 measures AFD1, by above-mentioned formula (13) calculate flashlight to the incoming position of PSD105 apart from t1.

In step S102, to second chart, 108 superframe signal light, find range from the IRED104 of camera 101.PC110 measures AFD2 and signal light quantity I2, by above-mentioned formula (14) calculate flashlight to the incoming position of PSD105 apart from t2.

In step S103, PC110 use distance L 1, L2, the L3 of first chart 107, second chart 108, imaginary the 3rd chart 112 and the incoming position in step S101, S102, obtained apart from t1, t2, by above-mentioned formula (15) calculate when imaginary the 3rd chart 112 found range flashlight to the incoming position of PSD105 apart from t3.

In step S104, the state that is blocked based on the front of the light projector lens 102 of camera 101, PC110 makes remote adjustment luminous with IRED106 at the c of Fig. 2 point, find range, identical with the processing of step S101, S102, from the AF data of this moment calculate flashlight to the incoming position of PSD105 apart from tc.

In step S105, the state that is blocked based on the front of the light projector lens 102 of camera 101, PC110 makes remote adjustment luminous with IRED106 at the b of Fig. 2 point, find range, identical with the processing of step S101, S102, from the AF data of this moment calculate flashlight to the incoming position of PSD105 apart from tb.

In step S106, PC110 carries out the computing of simulating signal light occurrence positions.Promptly, what use was obtained in step S103, S104, S105 calculates distance X a between action a-c point apart from the distance X b between t3, tb, tc and b-c point and by above-mentioned formula (16), the luminous position (a point) when obtaining the remote adjustment of remote adjustment usefulness IRED106.

In step S107, PC110 uses the light quantity data I 2 measure in step S102, and calculates the light quantity data I 3 of the flashlight when imaginary the 3rd chart 112 found range by following formula (17 ').

In step S108, PC110 carries out the light intensity of simulating signal light and regulates processing.That is, become the light quantity data I of in step S107, obtaining 3, and make the resistance change of the variable resistor 121 of Fig. 5 regulate remote adjustment on a point with the luminous quantity of IRED106 in order to make the signal light quantity that incides among the PSD105.

In step S109, under the state that is blocked in the front of the light projector lens 102 of camera 101, PC110 carries out remote imaginary range finding is handled.That is, make the IRED104 of camera 101 and move to the remote adjustment that a order luminous, measure the AFD3 of AF data of the slope of the remote survey adjustment straight line Pc1 that is used to calculate Fig. 4 with IRED106.

In step S110, PC110 is by using AFD1, AFD2, AFD3 and first chart 107, second chart 108, the distance L 1 of imaginary the 3rd chart 112, L2, the L3 that obtains in above-mentioned steps S101, S102, S109, calculate conversion straight line Pa1 as the AF data and the 1/L data of adjusted value, slope coefficient AFK1, the AFK2 of Pc1 with above-mentioned formula (18), (19).

In step S111, PC110 finishes the processing of this program to writing in the presumptive address of the nonvolatile memories such as EEPROM 101b that are built in the camera 101 as the AFD2 of benchmark AF data and slope coefficient AFK1, the AFK2 that obtains of measuring in step S110 in step S102.

More than, adjusting gear 120 according to first embodiment that illustrates, even the 3rd chart 112 that is not provided for adjusting at a distance, also can measure the AFD3 of the AF data identical with actual AF data when the 3rd chart 112 is found range, therefore, can not make the miniaturization of seeking adjusting gear under the situation of adjusting deterioration in accuracy.

The block scheme of use Fig. 7 illustrates the adjusting gear of the second embodiment of the present invention below.

The adjusting gear 220 of this second embodiment, the remote adjustment that can move on first chart is relative with the scheme of IRED with using in the adjusting gear 120 of above-mentioned first embodiment, as shown in Figure 7, remote adjustment IRED array 206 is set on first chart 207, by switching each element of luminous IRED, can carry out the adjustment identical with the adjusting gear 120 of above-mentioned first embodiment.The computings of adjustment in this adjusting gear 220 order, adjusted value etc. are identical with the situation of above-mentioned first embodiment, below mainly different piece described.And, though the formation identical with the veil 112 of Fig. 1 exist,, omitted in the diagram.

The camera 201 of the built-in distance measuring equipment of being adjusted by this adjusting gear 220 is identical with the situation of first embodiment, as shown in Figure 7, has: to the light projector lens 202 of subject projection from the flashlight that IRED204 sent; The sensitive lens 203 of flashlight imaging on PSD205 by the subject reflection; Generation is to the IRED204 of the flashlight of subject projection; The PSD205 of output corresponding electric current of centre of gravity place of the signal luminous point of imaging with passing through sensitive lens 203; Handle the AFIC of the output of PSD; The photographic lens lens barrel; Carry out the control of camera and the CPU that carries out the control of distance measuring equipment; The data that storage is relevant with range finding and the EEPROM of the data of the control that is used for camera etc.

This adjusting gear 220 has: closely adjust with first chart 207, be arranged on from the principal point of the sensitive lens 203 of camera 201 and leave on the position of distance L 1; Closely adjust with second chart 208, be arranged on from the principal point of the sensitive lens 203 of camera 201 and leave on the position of distance L 2; The remote adjustment used IRED206, is arranged on first chart 207; Adjust and use PC210, carry out the control of the camera of adjusting 201 and the computing of adjusted value etc.; I/F circuit 209 is as by coming self-adjusting to carry out driving up and down of first chart 207 and the remote control device of adjusting with the light emitting control of IRED array 206 etc. with the signal of PC210; Be used to drive the power supply unit 211 of camera 201.

And above-mentioned remote adjustment is to switch a plurality of pointolites of each IRED to the light accepting part superframe signal light of camera 201 when adjusting at a distance with IRED array 206.And above-mentioned I/F circuit 209 is not used in the mobile control division of remote adjustment with IRED.And, become distance L 1, distance L 2 from the principal point of the sensitive lens 203 of camera 201 to second chart 208 from the principal point of the sensitive lens 203 of camera 201 to first chart 207.

In the adjusting gear 120 of above-mentioned first embodiment, when adjusting action, remote adjustment is moved with IRED106, but, in this adjusting gear 220, next luminous from remote adjustment when adjusting distance measuring equipment by PC210 with selecting specific I RED to come the IRED array 206, the luminous position of computing simulating signal light and light quantity intensity, determine, carry out the adjustment of distance measuring equipment.

According to the adjusting gear 220 of above-mentioned second embodiment, use the IRED array use IRED as remote the adjustment, therefore, do not need to make the mechanism that IRED moves and move the used time, can enough simpler formations carry out the adjustment of high speed.And, if a plurality of remote adjustment with IRED array bidimensional be configured on the chart, the configuration that can be used in the light projector light accepting part in the camera 201 is a situation and carry out the adjusting gear of the distance measuring equipment of the many AF of bidimensional longitudinally.

The block scheme of use Fig. 8 illustrates the adjusting gear of the third embodiment of the present invention below.

The adjusting gear 320 of the 3rd embodiment, the remote adjustment that can move on first chart is relative with the scheme of IRED with using in the adjusting gear 120 of above-mentioned first embodiment, as shown in Figure 8, the light projector device 312 of the remote adjustment usefulness of the light projector position changeable of use flashlight, on being arranged on position with the light-projecting portion equivalence of camera 301 apart from the distance of first chart 307, thus, can carry out the adjustment identical with first embodiment.The computings of adjustment in this adjusting gear 320 order, adjusted value etc. are identical with the situation of above-mentioned first embodiment, below mainly different piece described.And, though the formation identical with the veil 112 of Fig. 1 exist,, omitted in the diagram.

The camera 301 of the built-in distance measuring equipment of being adjusted by this adjusting gear 320 is identical with the situation of first embodiment, as shown in Figure 8, has: to the light projector lens 302 of subject projection from the flashlight that IRED304 sent; The sensitive lens 303 of flashlight imaging on PSD305 by the subject reflection; Generation is to the IRED304 of the flashlight of subject projection; The PSD305 of output corresponding electric current of centre of gravity place of the signal luminous point of imaging with passing through sensitive lens 303; Handle the AFIC of the output of PSD; The photographic lens lens barrel; Carry out the control of camera and the CPU that carries out the control of distance measuring equipment; The data that storage is relevant with range finding and the EEPROM of the data of the control that is used for camera etc.

This adjusting gear 320 has: closely adjust with first chart 307, be arranged on from the principal point of the sensitive lens 303 of camera 301 and leave on the position of distance L 1; Closely adjust with second chart 308, be arranged on from the principal point of the sensitive lens 303 of camera 301 and leave on the position of distance L 2; Adjust and use PC310, carry out the control of the camera of adjusting 301 and the computing of adjusted value etc.; I/F circuit 309, during as remote adjust by coming self-adjusting to carry out the control device of the light projector position control, light emitting control etc. of the light projector device 312 of driving up and down of first chart 307 and remote adjustment usefulness with the signal of PC310; Light projector device 312, be set at position with the light-projecting portion equivalence of camera 301 apart from the distance of chart on, as the light projector device of the remote adjustment usefulness of the projecting direction of flashlight, light projector position changeable; Be used to drive the power supply unit 311 of camera.

Above-mentioned light projector device 312 has: throw from the remote adjustment light projector lens 313 of remote adjustment with the simulating signal light that IRED314 sent to adjusting with first chart 307 when remote the adjustment; Become the remote adjustment IRED314 of the pointolite that above-mentioned simulating signal light takes place, control light projector position and amount of emitted light on first chart 307 of above-mentioned simulating signal light by I/F circuit 309.

In the adjusting gear 120 of above-mentioned first embodiment, when adjusting action, remote adjustment is moved with IRED106, but, in this adjusting gear 320, by PC310, when adjusting distance measuring equipment, light projector device 312 is driven, projecting on first chart 307 from the simulating signal light of remote adjustment with IRED314.The launching position of above-mentioned simulating signal light and light quantity intensity are carried out computing by PC310 and are decided, and carry out the adjustment of distance measuring equipment.

Adjusting gear according to above-mentioned the 3rd embodiment, use the variable remote adjustment light projector device of launching position of flashlight, the luminous point that is subjected to of equivalence resembles imaging on PSD305 when in fact finding range with camera 301 and make, therefore, the error of the centre of gravity place on the caused PSD305 of shape difference of the point image of existence generation possibility can not produce among first, second embodiment of use pointolite when adjusting at a distance, therefore, can carry out more high-precision adjustment.And, if as the remote light projector device 312 of adjusting usefulness, use the projecting direction of simulating signal light, the scheme that launching position can change two-dimensionally, the configuration that can be used in the light projector light accepting part in the camera 301 is a situation and carry out the adjusting gear of the distance measuring equipment of the many AF of bidimensional longitudinally.

Adjusting gear or method of adjustment according to above-mentioned each embodiment, a kind of adjusting gear of distance measuring equipment is provided, only carry out the change of the processing mode (program) of adjusting gear, accept the different distance measuring equipments and the adjusting gear that carries out the distance measuring equipment of multiple point distance measurement of configuration of light with regard to realizing projection.

Effect of the present invention:

As described above, according to the present invention, can not make in the situation of adjusting deterioration in accuracy Seek to carry out the initiatively miniaturization of the adjusting device of the adjustment of the range unit of mode.

Claims (6)

1. the adjusting gear of a distance measuring equipment, have light projector device and the infrared rays receiver of accepting by the flashlight of above-mentioned subject reflection to subject superframe signal light, deviation to the optical system of the distance measuring equipment of obtaining the subject distance according to the incoming position of the flashlight on the light receiving position detecting element that constitutes above-mentioned infrared rays receiver and signal processing circuit etc. is adjusted, it is characterized in that

Closely the adjustment of side is to carry out with the actual data of finding range of distance of figure according to arrival being configured in closely adjusting on the above-mentioned adjusting gear, the adjustment of remote side is to carry out according to the data of using simulating signal light to find range, and this simulating signal only comes comfortablely to use on the intersection point of figure than closely adjusting to adjust at a distance with the light path of the flashlight of figure and adjustment closely with the figure imaginary imagination of preset distance far away.

2. adjusting gear according to claim 1, it is characterized in that, the light intensity of above-mentioned simulating signal light is the light quantity that inferred by the light light quantity during from the adjustment of side closely, and it is adjusted to above-mentioned imagination adjusted at a distance and is subjected to the light light quantity when finding range with figure.

3. adjusting gear according to claim 1 is characterized in that, the light source that above-mentioned simulating signal light takes place is arranged on above-mentioned closely the adjustment with the movable pointolite on the figure.

4. adjusting gear according to claim 1 is characterized in that, the light source that above-mentioned simulating signal light takes place is arranged on above-mentioned closely the adjustment with a plurality of pointolites on the figure.

5. adjusting gear according to claim 1, it is characterized in that, the light source that above-mentioned simulating signal light takes place is gone up projection simulating signal light to above-mentioned closely the adjustment with figure, and is different with the light projector device of above-mentioned distance measuring equipment, the light projector device that launching position is variable.

6. adjusting gear according to claim 1, it is characterized in that, closely adjusting with the position on the figure of above-mentioned simulating signal light taken place, and is according to when sending the ranging data of simulating signal light launching position detection when finding range with flashlight with the reference position on the figure and calculate from closely adjusting.

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