JPS59147329A - Automatic focusing device - Google Patents

Abstract

PURPOSE:To perform automatic focusing without consuming the electric power of power source battery in a camera by powering on the electric circuit for focusing detection of the camera side by the large-capacity power source of a lens barrel side regardless of which operation member between the camera side and lens barrel side is operated. CONSTITUTION:When the switch 40 of the lens barrel side is turned on, the large-capacity power source 38 of the lens barrel side powers on the motor driving control circuit 46 for a motor 56 which moves a lens barrel for focusing and also powers on the focusing state detecting circuit 19 and sequence control circuit 15 of the electric circuit for focusing detection of the camera side. On the other hand, when the switch 10 of the camera side is turned on instantaneously associatively with a shutter, a hold voltage is generated at a terminal E of the circuit 15 by instantaneous power feed from the camera-side power source 8 to turn on transistors (TR) 42 and 39, so that the circuits 19 and 15 are powered on by the power source 38. This constitution performs the automatic focusing without using the power source battery in the camera body.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic focusing device, and more particularly, to a focusing camera that detects the image formation state of a focal point and obtains lens movement information for driving a photographing lens toward an in-focus point. , relates to an automatic focusing device that is combined with a lens barrel that moves a photographing lens by a motor based on lens movement information obtained from the focusing camera.

In conventional automatic focusing devices that combine the above-mentioned useless camera and lens barrel, operation switches are provided on the camera side and inside the lens barrel, and no matter which operation switch is turned on, the automatic focusing A device in which a focusing mechanism works has been proposed (Japanese Patent Laid-Open No. 57-49927). However, in this device, the power supply battery built into the camera is used to power the focus detection circuit on the camera side, and the power supply battery built into the lens barrel is used to power the motor drive circuit on the lens barrel side. For example, if the power supply battery on the camera side decreases in voltage due to exhaustion, the focus detection circuit will not be able to receive the normal operating voltage, and the autofocus mechanism will no longer work. However, there was a problem in that even if it worked, the operation would be unstable. In particular, power batteries on the camera side are generally used with small lids due to space considerations, so they wear out quickly.
Even though there is enough energy left in the power battery on the lens barrel side to operate the motor drive circuit, there is a high possibility that the focusing mechanism will not operate.

The purpose of the present invention is to address the above points, and to enable the automatic focusing mechanism to operate regardless of whether the operation switches provided on the camera side or the lens barrel are turned on, and to enable the automatic focusing mechanism to work even when the operation switches provided on the camera side and the lens barrel are turned on. Even if the voltage drops due to battery exhaustion, the power battery on the lens barrel side supplies power to the electric circuit for focus detection and the electric circuit for motor movement, allowing the automatic focusing mechanism to operate. We are here to provide the equipment.

Hereinafter, the present invention will be explained based on illustrated embodiments.

FIG. 1 is an electrical NyF6 diagram of an automatic focusing device showing one embodiment of the present invention. In Figure 1, the electric circuit for the camera is shown on the left, and the electric circuit for the lens barrel is shown on the right. Both electric circuits are connected to the electric contact terminals provided on the mounting surface between the camera and the lens barrel. 1 to 7 are connected.

In terms of the circuit configuration on the camera side, the positive terminal of the power supply battery 8 built into the camera is connected to the emitter of a PNP transistor 9 and also to the collector of the transistor 9 via a push button switch 10. . This operation switch is a switch that closes with the first stroke of pressing the shutter release button. The base of transistor 9 is connected to the collector of NPN transistor 12 via resistor 11. The emitter of the transistor 12 is connected to the earth line 13 connected to the negative terminal of the power supply battery 8.
Close to! The base of the transistor 120 is connected to the output terminal E of the sequence control circuit 15 via the resistor 14. When the switch 10 is turned on, the transistors 9 and 12 turn on the sequence control circuit jf! A self-holding circuit is formed which receives current from the terminal E of f15 and maintains the power supply until a series of automatic focusing operations are completed.

Further, the collector of the transistor 9 is a diode 16.
The cathode of the diode 16 is connected to the cand of the diode 170. The anode of this diode 17 is connected to the electrical contact terminal 1 in the power supply line from the lens barrel side.

A power supply terminal P of the sequence control circuit 15 and a terminal P of the focus state detection circuit 19 are connected to a contact point 18 between the cathodes of the diodes 16 and 17. Ground terminals G of the sequence control circuit 15 and the focus state detection circuit 19 are connected to the ground line 16. Power is supplied to the sequence control circuit 15 and the focus state detection circuit 19 from the power battery 8 on the camera side through the diode 16, and from the power battery 38 on the lens barrel side through the diode 17. The sequence control circuit 15 performs sequence control of circuit operations on the camera side and the lens barrel side, and the focus state detection circuit 19 detects the imaging state of the subject light image transmitted through the photographic lens. The output terminal BK of the sequence control circuit 15 is connected to the anode of a diode 20, and the cathode of the diode 20 is connected to the electrical contact terminal 2 and the collector of an NPN transistor 21. This transistor 21 is used to cut off the power supply from the sharp tube side when the power supply is no longer needed.The base of the transistor 21 is connected to the terminal F of the sequence control circuit 15, and the emitter is grounded. Connected to line 16. Sequence control circuit 150
The input terminal H is connected to the anode of the diode 16, and is also connected to the ground line 16 via a resistor 22. A reset terminal R of the sequence control circuit 15 is connected to the electrical contact terminal 6. The input terminal of the sequence control circuit 150 and the terminal VVi are connected to the output terminals T and C of the focus state detection circuit 19, respectively. The front bin phase output terminal 81 of the focus state detection circuit 19, the focus output terminal T, and the rear bin output terminal U are display light emitting diodes (hereinafter referred to as LEDs) provided in the finder.
．． 25 cathodes, and the anodes of these diodes are connected to the connection point 18. Output terminals A, B, and C of the focus state detection circuit 19 are connected to electrical contact terminals 5 and 4.5, respectively. Further, when the camera is open, a photometry/line control circuit 26 that measures the brightness of the subject and determines the location of the light as a result is connected between the connection point 18 and the ground line 13 to supply power. It is set up like this. Earth line 1 of the above camera measurement
6 is a power supply battery 6 on the lens barrel side through an electrical contact terminal 7.
It is connected to the ground line 67 connected to the ground line 8.

Regarding the circuit configuration on the lens barrel side, the positive terminal of the power supply battery 38 built into the lens barrel is connected to a PNP type transistor 6.
It is connected to the emitter of 9, and the pushbutton switch 4
0 to the collector of the transistor 69. Transistor 690 is connected to N through resistor 41.
A PN type transistor is connected to the collector of the star 42, and the emitter of the transistor 42 is connected to the ground line 37. The base of transistor 420 is connected to the cathode of diode 45 via resistors 43 and 44. The connection point between the resistors 43 and 44 is connected to the electrical contact terminal 2, and is connected to a power supply line 47 drawn out from the anode of the diode 45 and the collector of the transistor 59 and connected to the electrical contact terminal 1. has been done. The transistors 39 and 42 and the diode 45 form a self-holding circuit for maintaining the power supply from the power supply battery 38 when the switch 40 is turned on.
Geetance control Il when 0 is turned on! It is also operated by the output of the terminal E of the q circuit 15. A power supply terminal P of a motor drive control circuit 46 is connected to the power supply line 47, and a ground terminal q of the circuit 46 is connected to the power supply line 47.
is connected to the ground line 37. Input terminal J of motor drive control circuit 46.

K and L are connected to the electrical contact terminals 5 and 4.5, respectively, and the output terminal Q is connected to the electrical contact terminal 6. Motor drive control output terminal M for motor drive control 1 path 46;
N is also connected to the bases of NPNW transistors 48 and 49, respectively. The collectors of transistors 48, 49 are connected to the bases of PNP transistors 50, 51, and the emitters of transistors 48, 49 are connected to NPN transistors 54 through resistors 52, 55, respectively.
．． It is connected to the base of 55. The above transistor 5
0.51 is connected to the positive terminal of the power supply battery 38, and the emitters of the transistors 54 and 55 are connected to the ground line 37. The collectors of the transistor 50 and the transistor 55 are connected to one end of a motor 561 for driving a photographic lens, and the collectors of the transistor 51 and the transistor 54 are connected to the other end of the motor 56.

FIG. 2 is an electrical circuit diagram of the sequence control circuit 15 shown in FIG. 1 above. In the Silkens control outlet circuit 15 shown in FIG. 2, a resistor 61 and a capacitor 62 are connected in series between terminals P and Q, and the connection point between the resistor 61 and the capacitor 62 is connected to the power supply when the power is supplied. It is connected to an input terminal of a power-on reset circuit 630 that generates an on-reset pulse. Power-on reset circuit 63
consists of two seam trigger inverters 64 and 65 provided at the input and output terminals, a capacitor 66 inserted between the two inverters, one end of which is connected to both ends of the capacitor 66, and the other end connected to terminal G. connected resistor 67
, 68 and K. The output terminal of the power-on reset circuit 63 is a D-type flip-flop (hereinafter referred to as
D-FP) (59 clock terminal CLK, R8 type 7 lip 70 tube (hereinafter referred to as R8-FF) 70 reset terminal R
, Two three-person gates 71, 72 colors R8-F
The first input terminal on the set side of F73, OR gate 74
and the first input terminal on the reset side of R8-1i'I'' 77, which is composed of a three-person cutoff gate 75 and a two-person cutoff gate 76.
The input terminal 1) ATA of 69 is connected to the input terminal H of this sequence control circuit 150, and is also connected to the second input terminal on the set side of R8-FF77 via an inverter 78. The output terminal of R8-FF77 is connected to one input terminal of an OR gate 79, and the other negative logic input terminal of the OR gate 79 is connected to the input terminal D A.
'I' A is connected. The output terminal Q+ of the D-FF 69 is connected to one input terminal of the AND gate 80,
The output terminal Q of R8-FF70 above is an AND gate 80
is connected to the other negative logic input terminal. anime game
) 80 is connected to the output terminal EK of the sequence control circuit 15. The output terminal of the OR gate 79 is connected to one input terminal of an AND gate 81, and the other input terminal of the AND gate 81 is connected to the R8
The output terminal of the AND gate 81 is connected to the terminal V of the sequence control circuit 15 through the resistor 86.
This terminal V is connected to one negative logic input terminal of an AND gate 86, one input terminal of a NOR gate 84, and a clock terminal CLK of an n-ary counter 85. The n-ary counter 35 is for counting the number of times the focus adjustment operation is repeated toward the in-focus point, and when a predetermined number of times (n times) has been counted, the other input terminals of the AND gate 83 and the NOR gate 84 are connected to this sequence control circuit. It is connected to the No. 15 reset terminal. The output terminal of the AND gate 83 is connected to the second input terminal of the above R8-FF73 ff1ll, and the output terminal of the NOR gate 84 is connected to the second input terminal of the R8-FF73.
Reset of F73) is connected to the first input terminal of M.

The output terminal of the n-ary counter 85 is the R, 5-FF
73) 1l (the second input terminal of l, one input terminal of the OR gate 86, and the alarm input terminal ARK of the PCV drive circuit 87 are connected. The input terminal of this sequence control circuit 15 is connected to the inverter 8B. It is connected to the input terminal END of the PCv drive circuit 87, the other input terminal of the OR gate 86, and the other input terminal of the OR gate 74 via the PCv drive circuit 87.
The output terminal OU '1'' of this sequence control circuit 15
The above-mentioned terminal GK is connected to the terminal 89 of the terminal GK via an external PCV (piezo ceramic vibrator) 90. The output terminal of the OR gate 86 is the above R8-FF70
It is connected to the reset input terminal S, the reset side input terminal of the FF 77, and the terminal F of the sequence control circuit 15. The output terminal of the OR gate 74 is connected to the reset terminal RESET of the n-ary counter 85.

FIG. 3 is a block circuit diagram of the focus state detection circuit 19 in FIG. 1. Focus state detection circuit 1 shown in FIG.
9 includes a detector 101 consisting of a photoelectric conversion collector array that detects the imaging state of the subject light transmitted through the photographic lens as an electrical signal, and the output of the detector 101 is sent to the processing circuit 10.
2. A processing (b) circuit 102 converts the output of the detector 101 into a digital value corresponding to the amount of focus shift based on a predetermined evaluation function, converts this into a parallel signal, and sends it from the °C output terminal DOUT to the parallel-to-direct converter circuit 103 and the LED body. Input terminal DIN of focus determination circuit 104 for sea bream
It is sent to Terminal 5 of parallel-to-direct conversion circuit 103
TART is connected to the output terminal C of the focus state detection circuit 19, and the terminal END is connected to the terminal CK via the inverter 105. Parallel-to-direct conversion circuit 106 is connected to terminal 5
When the level of TART becomes H”, the processing circuit 102
The digital outputs generated in parallel are converted into series and a serial pulse is generated at the output terminal PAOUT or PBOUT in accordance with the focus shift. Output terminal P
A OUT and PBOUT are connected to output terminals A and H of this focus state detection circuit 19, respectively. The focus determination circuit 104 is a circuit that determines whether or not the focus state is based on the digital output of the processing N path 102, and outputs the output terminal T in the focused state, the output terminal S in the front focus state, In the rear bin state, the output terminals U are set to III and H levels, respectively. Output terminal S of focus determination time #6104.

T and U are the same as the above L of this focus state detection circuit 19.
Output terminal 3 to which ED 23.24.25 connects,
Ill.

It is U.

FIG. 4 is an electrical circuit diagram of the motor drive control path 46 in FIG. 1. Motor skeleton control circuit 4 shown in FIG.
6, the input terminal J is connected to the set side input terminal of the 5-FF 113 consisting of the two-person gate 111 and the three-person gate 112, and one input terminal of the OR gate 114, and the input terminal is connected to the two-person gate 1.
R8-FF11 consisting of 15 and Sannin Kaagate 116
7) is connected to the 1fttl input terminal and the other input terminal of the upper AD OR gate 114. R8-P
The output terminal of F115 is connected to one input terminal of AND gate 118, and the output terminal of R8-FP117 is connected to one input terminal of AND gate 119. The output terminals of the motor drive control circuit 46 are connected to the output terminals M and N of the motor drive control circuit 46, respectively. The other negative logic input terminal of 118 and 119 is connected to the input terminal of this motor drive control circuit 46.

This input terminal R is also connected to one input terminal of an AND gate 121 via an inverter 120 and R
It is connected to the first input terminal on the reset side of the 8-FFs 113 and 117. This one-shot multivibrator 122 is composed of a capacitor 126 connected between the input terminal 1 and the reset terminal RESET, and resistors 124 and 125 each having one end connected to both ends of the same capacitor 123 and the other end connected to the terminal G. has been done. In addition, the output terminal of this one-shot multi-by-break 122 is the reset terminal of the up/down color/re 126: aE8ET
is connected to the output terminal Q of the up/rerun counter 126. It is connected to the other input terminal of 121. The output terminal of the AND gate 121 is connected to one input terminal of an OR gate 128 via a one-shot multivibrator 127, and the output terminal of this OR gate 128 is connected to the R8-F'F 113,
117 on the reset side and the output terminal Q of this motor drive control circuit 46. Further, the power supply terminal P of the seven-point drive control circuit 46 is connected to a movable electric contact piece 130 that is integrally provided with the distance ring of the photographic lens.
When the distance ring moves (gI), the movable electric contact piece 130 can move in contact with a pattern of electric contacts provided on the fixed substrate 161.

Electrical contacts 161c and 161d at both ends on the fixed board 131
is connected to the other input terminal of the OR gate 128. Between the electrical contacts 131c and 131d, there are a number of electrical contacts 1at1b, 2a+2b* ”'* ”a+
'b are arranged in parallel, and among these, every other electrical contact ja, 2a, ..., na contact group is connected to the Noah gate 132.
and 136 are connected to the input terminal a of R8-1'F'134, and also connected to the ground terminal G via the resistor 135, and every other electrical contact jb, 2b ,...-, nb contact group is the above R8-
FF 13417) is connected to the reset side input terminal G, and is also connected to the ground terminal G via a resistor 166.

The output terminal of the R8-FF 154 is connected to the down count input terminal DOWN of the up/down counter 126. The output terminal of the OR gate 114 is connected to the input terminal UP for up counting of the up/down counter 126.

Next, we will explain the operation of the automatic focusing device configured as above.
This will be explained using the time chart shown in FIG.

First, the case where the push button switch 40 on the lens barrel side is pressed will be described. When the push button switch 40 is turned on, power is supplied from the power battery 38 on the lens barrel side to the power supply line 47 through the push button switch 40, as shown in R5 (A) and (B). A power supply voltage is applied between terminals PG of the motor drive control circuit 46.

Furthermore, the power supply line 4 on the lens barrel side
7 to the camera side diode 1 through the electrical contact terminal 1.
Since the power is also supplied to the camera 7, the power supply voltage is also applied between the terminals PG of the sequence control circuit 15 and the focus state detection circuit 19 in the camera. Moreover, once power is supplied to the power supply line 47, this power supply line 4
7 maybe diode 45. A current flows between the ground line 67 and the base-emitter of the transistor 420 through the resistor 44 and 43, turning on the transistor 42. Therefore, the self-holding circuit formed by the transistors 42 and 39 is connected to the transistor 69 through the resistor 41. For,
Power continues to be supplied to the power supply line 47 by the power supply battery 38 on the lens barrel side until the transistor 42 is turned off by the output from the sequence control circuit 15.

When power is supplied to the focus state detection circuit 19, the third
As shown in the figure, the output of the detector 101 that has detected the imaging state of the subject light image is passed through the processing circuit 102 to the compatibility determination circuit 1.
04, and output terminal S according to the focal state at this time.
, T, and U, the force t becomes the "L" level. For example, as shown in FIGS. 5(N) to (P), in the front focus state, the output terminal S2 is in focus, and the output terminal T is in the focused state, and in the rear focus state, the output terminal U is at L" level.For this reason, the display L
ED 23. Any one LED from 24°25
The user is informed of the focus state by emitting light, so that if the camera is not in focus, the display LED 23 will light up in the front focus state, and the LED 25 will light up in the back focus state.

When power is supplied to the sequence control circuit 15, current flows through the resistor 61 to the capacitor 62 as shown in FIG. As shown in C), a short width power-on reset pulse is generated, and this pulse is guided to the reset input terminal R of R8-FF70 and also to the clock terminal CLK of D-FF69. When R8-l1'F70 is reset, its output terminal Q2 becomes L" level and the negative logic input terminal of AND gate 80 also becomes L" level. D-FF69 is input terminal D
Input terminal H of sequence control circuit 15 led to ATA
The level of the above input terminal) is stored and outputted to the output terminal Q1 of the D-1i'F69 from the time of the rise of the power-on reset pulse guided to the clock terminal CLK. The terminal H is connected to the connection point between the push button switch 1o on the camera side and the resistor 22 outside the sequence control circuit 15, and at this time, the push button switch 10
is off, so the level of input terminal H is HLIll. Therefore, the output terminal Q of the above JJ-FF69.

becomes ``L'', and the level of the output terminal E becomes 0L'' through the AND gate 8o. That is, if the input terminal H is at the L'' level, the sequence control circuit 15 detects that the push button switch 1o is off, and similarly holds the output terminal E at the 'L'' level. Output terminal E is “L”
” level, so the sequence control (9
) The transistor 12 connected via the resistor 14 outside the line 15 is kept off, and the power supply battery 8 on the camera side t! The self-holding circuit for supplying the L source does not operate.

Further, the power-on reset pulse from the power-on reset circuit 63 is guided to the reset terminal RESET of the n-ary counter 85 through the OR gate 74, so that the n-ary counter 85 is reset and its output terminal Qn is at the "L" level. Furthermore, the above power-on reset pulse is R
Since it is applied to the first input terminal on the set side of 8-FF73 and 77, the outputs of R,5-FF73 and 77 are both “H”.
” level, and therefore the output of the AND gate 81 becomes H.
” level, and through the resistor 82, the terminal V becomes
) as shown in FIG. 1-, the terminal S'l'ART of the parallel-to-direct conversion circuit 103 becomes "H" level.Then, this parallel-to-direct conversion circuit 103 converts the digital information of the focus state led from the processing circuit 102 into parallel. - Directly convert the number of serial pulses corresponding to the focus deviation violet to the output terminal PAOUT (output terminal A) or output terminal P corresponding to the direction of mA deviation.
BOUT (output terminal B) K is output.

That is, after the terminal V becomes "H" level by the power-on reset pulse, in the case of the front focus, the focus state detection (b) path 19 is activated as shown in FIG. 5(F).
A serial pulse is generated from output terminal A in accordance with the deviation of the front pin state. This serial pulse is guided to the motor drive control circuit 460 input terminal J. In the case of rear focus, the focus state detection circuit 19 as shown in FIG. 5(G)
A serial pulse corresponding to the rear pin state is generated from the output terminal B of the motor drive control circuit 46, and this serial pulse is led to the input terminal KK of the motor drive control circuit 46.

On the other hand, the terminal V of the sequence control circuit 15 is "H" 1/
When the signal becomes A/K, the input terminal of the motor drive control N path 46 on the lens barrel side becomes "H" level through the electrical contact terminal 5, so at the rising edge, the one-shot multi-viprator 122 outputs the signal as shown in FIG. The Lt threshold shown in (B) occurs, and the same set bar/I/scar R8-FF 113
, 117 on the reset side and the up terminal.
The reset terminal RESETK of the down counter 126 is led. The count contents of the up/down counter 126 are reset by receiving a reset pulse. Subsequently, when a serial pulse corresponding to the amount of out-of-focus described above is led to input terminal J or K, this serial pulse is inputted to input terminal UP for up-counting of amplifier/down counter 126 through OR gate 114, and the serial pulse The number of pulses is counted. When the up/down counter 126 starts counting, the level of its output terminal Qo becomes L'', so at this time, the electric contact piece 130 on the distance ring connects the electric contacts 131c and 131 at both ends.
As long as it is not in contact with d, the output of OR gate 12B is also
L'' level available, R8-F'F113 or R8-FF
117 is the input terminal J, and l is set to a set state by a serial pulse from K. That is, from the output terminal A or B of the focus state detection circuit 19 to the motor drive control circuit 4.
When a serial pulse is introduced to input terminal J or K of 6, respectively, the upper Hel(.

The output of 5-FF 113 or 117 becomes H'' level.

However, in this case, the above input terminal may also be connected to the Android game)
Since the H" level is led to the negative logic input terminals 118 and 119, the output of the output terminals 118 and 119, that is, the level of the output terminals M and N is "L".

When the focus state detection circuit 19 finishes sending out serial pulses from the output terminal A or B according to the amount of focus shift,
At this time, the parallel-to-direct conversion circuit 10 in the focus state detection circuit 19
Since the terminal END of No. 6 is at the "H" level for a short time, the terminal C is forcibly set to the "L" level via the inverter 105. Once the terminal C of the focus state detection circuit 19 becomes "L" level, the terminal V of the sequence control circuit 15 also becomes "L" level.

Then, at this time, the output terminal Q of the motor drive control circuit 46 is also at L'' level, so the sequence control (9) path 15
Since the reset terminal R of R,9- is also at the "L" level, the output of the NOR gate 84 becomes the "H" level.
Since the FF 73U is reset and the output goes to the 'L' level, the output of the AND gate 81 goes to the 'L' level, and the output terminal V is continuously maintained at the 'L' level.

When the above-mentioned terminal V reaches the "L" level, this N(," level is led to the negative logic input terminal of the AND gate 118 or 119, so at this time, the output is as shown in FIG. 5 (H) and (I). AND gate 118 or Vi to terminal M or ViN
The output of R, 5-FF 11!l or 117, which has become "H" level due to the serial signal (Rus), is sent out through 119. Since one input terminal of the gate 121 becomes ")(" level, the same AND gate 1
Waits for the output terminal Q0 of the 21-up/down counter 126 to reach the "H" level.

When the output terminal M or N of the motor drive control circuit 46 is "H"
When the output reaches the "H" level, this output causes a drive current of kA to flow in the direction of the arrow a (or bO) in the motor 56 as shown in FIG. This turns on transistor 48, which turns on transistors 50 and 54, so that transistor 50 and motor 56 are removed from power supply battery 38.
．． A driving current vJ in the direction of the force indicated by the arrow aO flows through the motor 56 through the path of the transistor 54.

When a driving current in the direction of arrow a flows through the motor j 156, the distance ring is moved by the motor 56, and the photographing lens moves from the front bin position to the in-focus position. When the output terminal N reaches the NHI+ level, the transistor 49 is turned on, which turns on the L transistors 51 and 55, so that the motor is A drive current in the direction of the force indicated by the arrow bO flows through the motor 56.

When a driving current flows in the direction, the distance ring is rotated by the lens 56, and the photographing lens moves from the rear focus position to the focus position.

When the distance ring is driven by the motor 56, a movable electric contact piece 160 integrated with the distance ring is attached to the fixed base plate 161.
It moves over the pattern of electrical contacts above.

This is possible! By moving the klt air contact piece 130, the air contact piece 160
are electrical contacts 1allb, 2a12b+ ””+ ”ar
nb] direction or the opposite direction from appropriate positions, the movable electric contact piece 130 contacts the electric contact point 1a.
%) a, ..., na, an "H" level pulse is applied to the set side input terminal a of R8-FF 134 as shown in FIG. 5 (J), and the movable electric When the contact piece 130 contacts the electrical contacts 1b, 2b,..., nbK, R8-F'F as shown in FIG.
Since a high level pulse is applied to the reset side input terminal b of the R8-FF 134, the levels of the input terminals a and b become H'' level alternately, and the up/down counter 126 starts counting down from this R8-FF 134. Pulses are sent to the terminal DOWNK as shown in FIG. 5 (L). The up/down counter 126 has an input terminal DOW.
When pulses are led to N one by one, the count contents given from the up-counting terminal UP are counted one by one. Then, when the number of pulses equal to the count content given from the up-counting terminal UP is given to the input terminal DOWN, the output terminal Q of the up/down counter 126 is output from the up/down counter 126.
Since the level is null, at this time, the ``)1'' level is introduced to the one-shot multivibrator 127 through the AND gate 121, and the one-shot multivibrator 127
rr! As shown in FIG. 5 (2), the AND gate 121
A short pulse of NH11 level is generated at the rising edge of . Then, this 'H' level pulse passes through the OR gate 128 to the second reset side of R8-F'F113 and 117.
Since these R8-FF are reset by being guided to the input terminal of
13 or 117 enters the reset state, and its output becomes 'L.
” level. Therefore, output terminals M and N are “H”.
Since the output terminal, which had been at the level, becomes the 6L" level, the transistors 48, 50, 54 or 49,51° 55 are turned off, the power supply to the motor 56 is cut off, and the movement of the photographic lens is stopped. At the same time, , the short "H" level output pulse of the one-shot multivibrator 127 is led to the reset terminal R of the sequence control circuit 15 on the camera side through the output terminal Q of the Tanabata drive control circuit 46 through the OR gate 128. , at this time, since the terminal V is at the "L" level, the output of the AND gate 83 is at the "H" level, and the output of the NOR gate 84 is at the "L" level.
Therefore, R8-FF7S is sent, the AND gate 81 detects the H level, and the terminal V becomes the "Tr" level. That is, the sequence control circuit 15 changes the terminal R to H'' level after the terminal V goes to L'' level.
This means that one cycle of the series of distance adjustment operations toward the in-focus point has been completed, and the terminal V returns to the 1H" level again. This terminal V becomes the 'H" level and The n-ary counter 85 counts that the distance adjustment operation has completed a cycle.

When the terminal V returns to H'' level, focus state detection path 1
9 is the terminal 5TA of the parallel-to-direct converter circuit 103 through the terminal C.
Since RT becomes "H" level, a serial pulse is again generated at the output terminal A or [B according to the image formation shape 11, and after that, the above-mentioned operation is performed in the same way, and a series of pulses toward the in-focus point are generated. The distance adjustment operation is repeated. The number of times this series of operations is repeated is counted by the n-ary counter 85 in the sequence control circuit 15.

The series of distance adjustment operations described above are repeated, and when the focus state is reached less than a predetermined number of times predetermined by the upper Rer n-ary counter 85, the focus state detection circuit 19 is activated as shown in FIG. 5(0). Since the output terminal T of the focus judgment (b) path 104 becomes 'L' level, the display L B D24 emits light in the viewfinder at this time, and therefore the input terminal of the sequence control circuit 15 has the above 'L' level. '' level is led to the PCv drive circuit 870 input terminal END via the inverter 88 at the "H" level. Therefore, the PCV drive circuit 87 operates in the first mode to set the PCV 90 to 1. The device is driven to generate a short sound, "pitsu, beep," to inform the user that it is in focus. At this time, the output of the OR gate 74.86 becomes "H" level, so the n-ary counter 85 is reset, and the terminal F
becomes H" level as shown in FIG.
from diode 45. Resistance 44. A current flows through the electrical contact terminal 2 and the red circuit of the transistor 210, so that no base current flows through the transistor 42, and the transistor 42 and the transistor 59 are turned off. Therefore, at this time, if the push button switch 40 is not turned on, the power supply line 47 and the power battery 38 will be cut off, and the sequence control circuit 15. The power supply to the focus state detection circuit 19 and motor drive control circuit 46 is cut off.

If the push button switch 40 is still in the ON state, the sequence control circuit 15 and the focus state detection circuit 1 are
9. Power is supplied to the motor drive control circuit 46 and the trie
, kick. Therefore, if the subject or camera moves and goes out of focus after the shutter release, after the n-ary counter 85 is reset, the terminal ■ will go to the 'H' level. Therefore, the sequence control N path 15 returns to its initial state and the above-mentioned operation is restarted.In other words, when the subject or camera moves, the photographing lens can refocus on the aimed subject. continue to operate.

Also, for example, the subject is moving so fast that the photographic lens cannot follow it, and therefore, even if the n-ary counter 85 has counted the predetermined number of times, it will not be in focus. If not, the output terminal Qn of the n-ary counter 85 becomes H" level and the alarm input terminals A and RK of the PCV drive circuit 87 are led, so it operates in the mode of this PCv rotation circuit 872 and the PCV 90 with a long beep sound to inform the user that it is impossible to adjust the distance to the in-focus point.At this time, R8-FF75 is reset by the output of the n-ary counter 85, so the The output terminal side of the gate 81, that is, the terminal V is at the "L" level, and the gate 81 is at the "L" level.
6, the terminal F becomes "H level".

When the terminal F reaches the ``H'' level, the transistor 21 is turned on as described above, so the transistors 42 and 3 are turned on.
9 is turned off, and if the pushbutton switch 4° is not turned on at this time, the sequence control (b) path 15.9 by the power supply battery 68 is activated. The power supply to the focus state detection tkJ circuit 12° motor drive control circuit 46 is cut off.

If the push button switch 4o is still on, the sequence control circuit 15. Focal sadness detection circuit 1
9. Power continues to be supplied to the motor drive control circuit 46, but since the terminal V is at the ``L'' level, the focus state detection circuit 19 and the motor drive control circuit 46 drive the photographing lens to the in-focus position. The focusing operation is not performed, and only the focus state in the finder by the display LEDs 23 to 25 is continuously determined by the output terminal S-U of the focus state detection circuit 19 until the push button switch 40 is turned on.

As described above, when the push button switch 40 on the lens barrel side is turned on, the motor drive control circuit 4 inside the lens barrel
6 as well as the sequence control circuit 15 and focus state detection circuit 19 in the camera are powered by the power supply battery 38 on the lens barrel side.
In this case, the camera's power battery 8 may be depleted, or even if the battery 8 is not stored in the camera, normal operation may not occur. It is done. Please note that the in-camera photometry
The line control circuit 26 is also supplied with power by the '#L source battery 38, and by pressing down the shutter release button after operating the push button switch 40, the correct focus can be set after the focusing operation is completed. Shutter control is performed using the exposure value.

Next, a case will be described in which the push button switch 10 on the camera side is operated. This push button switch 10 is linked to the shutter release button, and the first push button switch 10 is linked to the shutter release button.
When this push button switch 10 is turned on by a stroke, at this time, the push button switch 1 is turned on from the power battery 8 on the camera side.
0 and the sequence control circuit 1 through the diode 16
5 and the focus state detection circuit 19 are supplied with power. When power is supplied to the sequence control circuit 15, as described above, the output pulse of the power-on reset circuit wI63 is guided to the D-FF69, so at this time, the level of the input terminal H is detected and outputted to the output terminal E. Send. That is, since the input terminal H becomes H'' level by turning on the push button switch 100, this is led to one input terminal of the ANDGOO) 80 by the D-FF 69, and at this time, the R8-F
Since F70 is reset by the power-on reset pulse, the other negative logic input terminal of AND gate 80 becomes "L" level. Therefore, the level of the upper output terminal E becomes "H".The level of the terminal E of the sequence control circuit 15 becomes "H".
When the level becomes H'', the transistor 12 is connected through the resistor 14.
The base current tak flows to turn on transistor 12, which in turn turns on transistor 9. From this power source battery 8, the transistor 9. Power is supplied to the sequence control circuit 15 and the focus state detection circuit 19 through the diode 16. Moreover, when the above terminal E becomes "H" level, the diode 20 and the resistor 4
Transistor 42i on the lens barrel side through 6/C
m current flows, the transistor 42 turns on, and then the transistor 59 turns on, so in this case, even if the push button switch 4o on the lens barrel side is not pressed, the power supply on the lens barrel side is turned on. Power supply line 4 from battery 68
7. Therefore, power is supplied to the motor drive control circuit 46, and the above t1! The '#IL source is supplied from the m supply line 47 to the sequence control circuit 15 and the focus state detection circuit 19 through the diode 17. That is, the motor drive control circuit 46 is supplied with power by the power supply battery 68, but the sequence control circuit 15 and the focus state detection circuit 19 are supplied with power from the higher voltage source battery 8 or 68 through the connection point 18. Power is supplied.

After this, the same operation as described above is performed, so the photographing lens is moved to the in-focus point by the
If the in-focus state is obtained by driving less than a predetermined number of times predetermined by the advance counter 85, or if the in-focus state is not obtained even by driving the predetermined number of times and it is determined that the distance adjustment is not MB, Since the output of the OR gate 86 of the sequence control circuit 15 becomes H" level, the terminal F becomes 611" level, and at the same time, R8-FF70 is sent, so the negative logic input terminal of the AND gate 80 becomes "H" level and output. Terminal E becomes "L" level. Terminal F becomes "'H".
When the terminal E becomes the L II level, the transistor 21 is turned on, and the transistor 42 is turned on, so the transistor 39 is turned off, and the connection between the power supply line 47 and the power supply battery 38 is cut off. Ru.

Therefore, the power supply to the motor drive control circuit 46 is cut off, and at the same time, the power supply to the sequence control circuit 15 and the focus state detection circuit 19 through the diode 17 is cut off. Furthermore, when the output terminal E goes to the "L" level, the transistor 12 is turned off, and then the transistor 9 is turned off, so that the transistor 1
The self-holding enclosure created by 2 and 9 no longer works. For this reason,
If the push button switch 10 is not turned on at this time,
The power supply battery 8 on the camera side and the diode 16 are cut off, and the supply of power from the power supply battery 8 to the sequence control circuit 15 and the focus state detection N path 19 is cut off. If the push button switch 10 is kept in the ON state, even after the terminal E goes to the "L" level and the terminal F goes to the "H" level, The above sequence control circuit 15. Power continues to be supplied to the focus state detection circuit 19. However, at this time, since the terminal H2F is at the 'H' level and the output of the AND gate 81 is at the 'L' level, the level of the terminal V of the sequence control circuit 15 is at the 'L' level. Terminal C also does not generate a serial pulse for controlling the photographic lens from the "L" level output terminals A and B, but a "L" level focus state signal is sent from any of the output terminals S, T, or U. The display of LBD 23 to 25 in the finder continues until the push button switch 10 is turned off.

After the camera is in focus, the shutter release button is pressed down to the second stroke to release the shutter, activate the photometry/exposure control N path 26, and perform shutter control at an appropriate exposure value.

As described above, according to the present invention, by operating the operation section on either the camera side or the lens barrel side, the focus detection electric circuit on the camera side is powered by the power battery of the large capacity lid on the lens barrel side. This reduces the amount of power consumed by the power supply battery inside the camera, and also allows for normal focusing even when the power supply battery inside the camera is exhausted. Demonstrate.

[Brief explanation of the drawing]

FIG. 1 is an electric circuit diagram of an automatic focusing device showing an embodiment of the present invention, FIG. 2 is an electric circuit diagram of a sequence control circuit shown in FIG. 1, and FIG. FIG. 4 is an electric circuit diagram of the motor drive control circuit shown in FIG. 1, and FIGS. It is a time chart showing the operation of each part. 8.38...Power battery 10, 40...Push button switch (operation member) 15
......Sequence control circuit (electrical circuit for focus detection) 19 ....Focus state detection circuit (electrical circuit for focus detection) 46 ...Motor drive control circuit (Electric circuit for motor drive) Patent Acquaintance Olympus Optical Industry Co., Ltd. Daikonto Fujikawa Nanabeba 3rd Ward - I Oi - Bald 4th Ward Tobi G Procedures Amendment (Spontaneous) April 1982
May 4th, Mr. Kazuo Wakasugi, Commissioner of the Japan Patent Office, 1, Indication of the case, Patent Application No. 20846, filed in 1982, 2
, Title of the invention Automatic focusing device 3, Relationship to the person making the correction Patent applicant location 2-43-2 Hatagaya, Shibuya-ku, Tokyo Name (037) Olympus Optical Industry Co., Ltd. 4,
Agent Address: 5-52-14-5 Matsubara, Setagaya-ku, Tokyo.
Summary of the "Detailed Description of the Invention" of the specification to be amended, Drawing 6, and contents of the amendment (1) "Resistance 83" in line 9 of page 11 of the specification is changed to "resistance 82." (2) "Terminal END" in the 6th line from the bottom of page 16
After that, there is an r open collector type output terminal.
Add the phrase. (3) Delete the text from ``It is done.'' in line 13 of page 15 to before ``this one-shot'' in line 6 at the bottom of the same page. (4)Amend Figure 4 of the drawings attached to the application as shown in the attached sheet.

Claims (1)

[Claims] A camera that detects the focal point state and outputs lens movement information to the lens barrel to drive the photographing lens toward the focal point, and a motor that takes pictures based on the lens movement information obtained from this camera. In combination with a lens barrel that moves the lens, the camera is provided with a first power battery and a first operating member, and the upper i-pillar lens barrel is provided with a second power battery and a second operating member. By operating the first operation member, power is supplied from the first power supply battery to the focus detection electric circuit in the camera and from the second power supply battery to the focus detection electric circuit. and a motor drive electric circuit in the lens barrel, and when the second operation member is operated, power is supplied from the second power supply battery to the focus detection electric circuit and the motor drive electric circuit. An automatic focusing device characterized by: