JPS5986034A - Motor-driven camera capable of automatic focusing adjustment - Google Patents

Abstract

PURPOSE:To improve release possibility in an in-focus state by providing an automatic focus adjusting device which places automatically a photographic lens in the in-focus state, and detecting the operation of an automatic focus adjusting device and increasing an interval of release automatically during the operation. CONSTITUTION:A camera body C, lens barrel L, and motor driving device MD are provided. The camera body C is provided with an automatic focus adjusting circuit 1, shutter release control circuit 2, and photographic condition introducing circuit 3. The circuit 1 applies a driving signal to the lens barrel L to move the lens 7 to an in-focus position. A resistance VRf is varied according to focal length and the circuit 3 generates a voltage output corresponding to subject brightness and the focal length. The release interval control circuit 10 of the device MD has the timer circuit consisting of resistances R1-R8, capacitors C1 and C2, transistors (TR) Q1 and Q2, and a comparator CP, and the output of the circuit 3 is inputted to output a release inhibition signal to a motor driving control circuit 8. When the circuit 1 is in operation, the release interval is increased.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is directed to an electrically driven camera equipped with an automatic focusing device.

Conventionally, a camera is known in which a motor drive device 1' is attached to the camera to release the shirt at predetermined time intervals.

My father, on the other hand, uses a motor to drive the projection lens and automatically focuses m1.
Cameras that perform Al nri are also known.

Therefore, a camera capable of both continuous tA and i shadowing by the motor drive device 4 and focusing by the automatic focusing device 51 and 9 can be considered.

However, the motor drive device does not complete the focus imaginary part between releases because the successive releases are performed at predetermined time intervals according to a predetermined sequence.

There may be cases where the camera is released while adjusting the focus.

Especially in the combination of a motor drive device with a short release interval and an automatic focus adjustment device.

Except under certain limited conditions (for example, when the subject is moving very slowly), tracking is not possible because the time required for focusing does not fit within the release interval of the motor drive device.

Even if it has a built-in automatic focus adjustment device, it may not be able to take advantage of its benefits, and in some cases, you may end up taking out-of-focus photos on Tuesday.

The present invention is an electric 7j, 77 drive device 1 point (and automatic 2 point i)
When performing JTJ using an automatic focus adjustment device in a camera equipped with an R or 'J node device, the electric drive device automatically lengthens the release λ interval, so that the release is released after 6 focus rotations are completed. The purpose of this invention is to prevent the above-mentioned failures in continuous shooting during automatic focus adjustment.

FIG. 1 shows an embodiment of the invention.

゛Rorokku L, C, and MD are automatic focus adjustment circuits, respectively, and mirrors (AP resin).

The camera body (AF camera body), which is an automatic focus adjustment circuit, and the motor drive device are shown.

The camera body C includes an automatic focus adjustment circuit 1. Shutter release control circuit 2. And photography condition introduction circuit, '1lj4
．． and power switch sw.

including. The self-IIJ focal point 1 node circuit 1 is operated by being supplied with power from a power source 4 via a switch SW.

Auto focus jl+! I Ili circuit 1 has terminals T,,T,'
;T.

A lens drive signal is applied to the AF resin L via T3/. Switch SW is turned on.

While the automatic focus adjustment circuit 1 is in operation, the power is supplied from the power supply 4 via the switch SW1 to the terminals T5. .

An H level signal is generated every T. This signal is referred to as the focus adjustment circuit 1111 operation signal 2. Switch SW is OFF
F, and when automatic focus adjustment circuit 1 is inactive, terminal T
II, an L level signal is generated at T11'. This is called a focus adjustment circuit disable signal. The release control circuit 2 is powered by a power source 4. motor drive equipment fn
When the MD is not attached to the camera body C.

The release control circuit 2 controls the sequence from pressing a release button on the C side of the camera body (not shown) to rear cloth running (or mirror down). In addition, motor drive equipment [: M
When D is attached to the camera body C, there is a terminal T l!
+ T6' r T7゜']','; T,, T8
GND, trailing curtain running signal, photometry start signal, and release signal are exchanged between the camera body C and the motor drive device F=, MD via T, , 'l', and the motor drive device fff Eleven sequences, such as shutter release, are exported from the MD side. block 6
is constant TM flow source 5. Operational amplifier A Hr A 1 +
It includes a photodiode PI), a diode I), ,D.

The AF resin L is connected to the lens drive circuit 6. Focus+i! ,! +
It includes a nodal lens 7 and a variable resistor V.

f The Al'' lens L of this embodiment is a zoom lens, and as the focal length becomes longer, the resistance value of the variable resistor V□1f increases, and as the focal length becomes shorter, the value of the resistor □1f decreases. Operational amplifier A, c, terminal T4+”'4
'The resistance value of variable resistor vRf, Zunawaji lens L
Since the photodiode circle receives the subject light and generates an output according to the subject's brightness, the operational amplifier A generates an output according to the subject's brightness and focal length. Generates voltage output. The jinsu removal circuit 6 in the jinsu L has terminals T+ + 'r+' + 'l'l
Power is supplied from the camera body C via HTe+' (GND), and the
Input the lens distance 4h number through 1', , T,' and move the fish point adjustment lens 7 to the focus position 1 white.
Ru. The motor drive control circuit 8 receives a 1N supply from a battery 9 in the motor drive device (MD) and sends a measurement/light start signal that causes the motor drive 4 to start photometry in response to depression of the release button in the +KMD; A release signal to start the shutter release sequence of the camera is sent to the terminal T,,T,';T,,T,', and the end of exposure on the camera body C side is sent to the terminal T,.

It is detected by the trailing curtain running signal from T and 7 and starts the second winding. Terminal 'r6t T6' is GND on camera C side
and GND on the motor drive device side.

Further, the control circuit 8 outputs a constant voltage that does not depend on the power supply voltage of the battery 9 from the terminal P1.

The circuit 8 sends out a signal from the terminal P indicating that winding is in progress. This signal generates an L level output only during winding, and at other times generates an output of 1 level approximately equal to the voltage of the battery 9. Terminal P8 is the input terminal for the release prohibition signal, and while the L output appears on it.

Sending of the release signal from the motor drive control circuit 8 to the release control circuit 2 is prohibited.

Circuit block 10 is a release interval control circuit, and terminals P3 . Power is supplied from a constant voltage source output from

Receives the hoisting signal at terminal P. Resistance It, ~R.

Capacitor C5=Ct, l' transistor Q5. The Qt comparison gcP and the 5-contact switch SW constitute a timer circuit. Resistance. 〜几、、Transistors Q and 〜Q represent a release prohibition signal generation circuit, and the collector voltage of the transistor Qs, which is the output thereof, is a motor drive system a11.
It is applied to terminal P8 of circuit 8. The output voltage of the photographing condition introducing circuit 3 in the camera body C is the terminal 'IO+ T In.
' is applied to the terminal el of the switch SW, and the focus adjustment box 1 operation signal is applied to the terminal TIl + Tll'
is applied to one end of the resistor R through the resistor R. A resistor connected between terminals P1 and 1, -1. Terminals P, and b (7)
The resistors R1-8 connected between the resistors R, .

Switch SW is manually connected to terminal al J CHd+e
By switching to either one, the reference voltage applied to the non-inverting input terminal of the comparator CP is set.

Next is Honji 1ti! The operation of example i will be explained.

(11 to 4" automatic) 1 Ih operation when point adjustment circuit 1 is inactive is explained. Switch SW, QF
By setting F, the automatic focus adjustment circuit 1 becomes inactive. In this case, operate the operation member (not shown) by hand.
This drives the lens 7 and brings it into focus. On the other hand, switch SW, 01i'l'
This turns transistor Q8 off, and transistor Q becomes terminal P.

It is always turned on by the output of . Therefore, transistors Q and l are always OFF regardless of the output of the timer circuit.
Retain state.

That is, the release prohibition signal G is not transmitted to the control circuit 8 from the release prohibition signal generation circuit. In this state, if you press the release button on the motor drive device fii1MD side slightly, the control circuit 8 will send the terminals 'r, , 'r,'
The side light b(.1 first count) is transmitted to the control circuit 2 via the.

Light metering is performed on the camera body C. When the release button is further pressed, a release signal is sent to the control circuit 2 via the terminals T, ', and T, and the shutter in the camera body C is released by this II7 control circuit 2. When the trailing curtain runs, control circuit 2 connects terminal IJI.
A trailing curtain running signal is transmitted to the control circuit 8 via , , Ill, /. When the trailing curtain run signal is transmitted, the control circuit 8 causes the motor drive device 1! r: M
The motor (not shown) in D is moved away and an even portion of the film in the camera body C is wound up.If the above-mentioned release button is kept pressed, each of the -equal portions of film is wound up. Then, the command ηili 1 circuit 2 is transmitted again from the arsenal control circuit 8, and the shirt shutter release is released.As long as the button 11 is held down, the shirt shutter release is repeated at regular intervals. Continuous shooting is performed.When the automatic focus adjustment circuit 1 is malfunctioning, the release interval is determined by the shutter release time in the release control circuit 2 of the camera body and the film winding evenly by the motor drive control circuit 8. The time required for winding is determined by the time required for winding, but the normal shutter speed is so small that it can be ignored compared to the winding time.

If this release interval is determined only by the winding time of the motor drive 1ljlN1 circuit 8, it can be said that d''.Therefore, in this embodiment, the release interval when the focus adjustment circuit 1 is not activated is fixed and is determined as described above. The release is repeated at regular time intervals as shown in 11i1 below.
The release interval determined by the 1N1 circuit 8 is referred to as the "shortest release interval."

(2) Next, the automatic focus adjustment circuit 1 is activated, and switch SW is connected to terminals a and b.

The case where either c or d is selected will be explained. When the switch SWI is turned ONζ, the automatic focus adjustment circuit 1 is activated, and the lens 7 is automatically brought into focus by the lens drive circuit 6. And this lens drive circuit 6
moves to follow the subject and bring the lens 7 into focus. Further, by turning on the switch SW, the focal submuscular circuit motion signal is transmitted to the base of the transistor Q.

Transistor Qs, or ONT Q4, is OFF.

Therefore, Q is in the state 6.1 where it can be turned ON. However, this tli, '+! The capacitor C2 is already sufficiently charged by the current output from the l'drI terminal p of the i control circuit 8, and the inverting input of the comparator CP is higher than its non-inverting input. In other words, comparison zr6 CI' emits an L output.

Therefore, the transistor Q5 is in the OFF state jt,L.

, and the release prohibition signal is not transmitted to the terminal P3. In this state, when the release button on the motor drive device M I) is slightly pressed, the terminal T from the II control circuit 8 is released.
Side light 131 to control times hr, l, 2 via 8zT@'
The 4th start signal was transmitted.

When the release button is pressed further, a release signal is transmitted to the control circuit 2 through the terminals TOrT and /, and the shutter is released. When the trailing curtain is started to run, the film is immediately wound up as described above (11).At the same time as this film winding starts, the output of the terminal P becomes L, and the transistor Q is turned on. Kinaru.Transistor QI
When current flows through capacitor CI, resistor R4, It,
Transistor Q is turned ON for a moment via Q!, and the charge in capacitor C1 is transferred to this transistor Q! is completely discharged through the transistor Q8 while it is ON. Then, immediately after that, transistor Q returns to OFF,
Charging of capacitor C3 is started via resistor IL6. At this time, it is assumed that the five-contact switch SWI is connected to one of terminals a, b, and c. Then, when transistor Q is turned on for a moment, the terminal Narita of capacitor C3 (inverting input terminal voltage of comparator CP) becomes each terminal A,
Resistor R connected to b, c? -1e 几、-1、
几 becomes lower than the reference voltage (input terminal voltage of comparator CP) determined by ~S, comparator CP begins to output I (output), and capacitor C8 is charged by the start of ilm winding. As time passes, the voltage at the terminals of capacitor C1 becomes higher than the reference voltage.
Comparator CP changes state to issue an L output.

From the start of winding, the voltage at the capacitor C3 becomes rQ
x Th) I l-, the time taken to reach #III of the timer circuit! The timer 1 Samurai m1 outputs the output of the comparator CP4iH during one hour of this timer, while the transistor Q4 becomes UFFL/ due to the turning on of the transistor Q8 by the focusing circuit 1 (Fi), so in the end the transistor Q , is ON for only one hour of the timer. During that time, release prohibition No. 48 is transmitted to terminal Ps. Since the time constant determined by capacitor C1 and resistor R6 is constant, switch SW is connected to terminals a, b, and c. Depending on which one you switch to, i.e. resistance?
1e FL? -1' + R7S, the reference voltage of the comparator CP can be changed, and the timer 1 hour can be changed accordingly. When one hour of this timer has elapsed, the transmission of the release prohibition signal is completed, and the release signal is transmitted from the control circuit 8 to the control circuit 2 of 714, the shutter is released again, and the shutter release is repeated. In this embodiment, it is the time interval from the shutter release to the end of the one-hour timer.

In other words, the release interval is the switch SW.

Regardless of whether the terminal is switched to terminal a, b, or c, the release interval will be longer than the shortest release interval mentioned above. Simplified, it is as follows. When the shirt release is performed, the film is wound in the same time as in (11) above, and after a certain time (timer one hour - film winding time), the timer is started. The one-hour clock ends.The release is prohibited while the timer is counting one hour from the start of film winding, but when the timer finishes counting one hour, the release prohibition is canceled and the shutter is released again. .When the automatic focus adjustment circuit 1 is operating as described above, the H
They can make the release interval longer than when this circuit 1 is not operating.

In this embodiment, the switch SW- can also be switched to the terminal d which is in the oven state. When this y;- child is added to the cut 1, the M, ilA voltage of the comparator CP becomes the (4 always zero fall, 1)th.

Comparison "5CP always emits a positive output. Therefore, transistor Q always becomes (JFF).

The release prohibition signal is not transmitted to terminal P3.

The shutter can be released at the shortest release interval determined by the control circuit 8.

(:31 Next, we will explain the case where the focus i1.'if node circuit 1 is activated and the switch SWt is connected to the terminal e. In this case, the automatic focus adjustment is the same as described in (2) above. The lens 7 is brought into focus by the circuit 1 and the lens drive circuit 6. Then, when the release button is pressed, the shirt release and film winding are performed as described above (2).
) is done in the same way. However, in this case, the comparison circuit CPOIK quasi-voltage is controlled by the output of the photographing condition introduction circuit 6 connected to the terminal e. Therefore, the timer time varies depending on the focal length and subject brightness. That is, when the focal length is long or when the subject brightness is low, the timer becomes longer by one hour. During this one hour timer, a release prohibition signal is transmitted and the shutter release is 1u.
1J is stopped, and when the timer elapses one hour, a release is made in the same way as in the case of +21. If the focal length is long or the subject brightness is low, it will take longer to obtain the combined pressure and condition due to an increase in the amount of jinsun or a decrease in the response speed of the focus detection light-receiving condenser, but two shots will be taken. If the interval of the shirt release is controlled according to the focal length and subject brightness as in the example, the possibility that the shirt release will be released in an in-focus state will be higher. Of course, in this case (, j), the release interval is always the shortest release If′ mentioned above.
Needless to say, it is longer than the 41st interval. The circuit is constructed in this way.

The processing for time h=6 in FIG. 1 is as described above. Note that this circuit performs automatic focus adjustment by means not shown during the period from 10 when the shirt release signal is transmitted to the '+l++ control circuit 2 until the control circuit 2 issues the trailing curtain run signal, that is, during the flashlight. This is to stop lens driving by circuit 1 and lens driving circuit B. Further, in this embodiment, when the release button is pressed, the lens 7 is brought into focus, and the shutter can be released regardless of whether it is in focus or not.

Next, the appearance of the above camera will be explained using Figure 2. FIG. 2 shows a front view of the camera,
A camera body C is shown with a motor drive device RMD installed therein. The camera body C has the aforementioned focus adjustment circuit 1, release control circuit 2, etc. built-in, while the lens L has a built-in lens drive circuit 〇, etc. Both are electrical signal contacts (not shown, 'r, , 'r,' in Figure 1;...: +1+ , , T
, / ) perform automatic focus adjustment by sending and receiving electrical signals. In addition, the motor drive device F Ben MD has a motor drive control circuit 8 and a release interval control circuit 10.
etc. are built in, and transmission and reception of air signals with the circuit on the C side of the camera body is done at the contact point 20.20'11'1 in Figure 1.
l+T6'i...'TII+Tll'). The switching dial 21 provided on the motor drive device 〆cMD is the 5-contact switch SW shown in Fig. 1.
, is interlocked with the i'J motion intercepts, and when the dial 21 is set to ff& in the A position, terminal e is selected, and when the automatic focus adjustment circuit 1 is activated, it is automatically released depending on the subject brightness, etc. It works to lengthen the interval. dial 21
When it is set to the M position, terminal d is selected and the motor drive device it_M operates at the shortest release interval at any time. Then turn the dial 21 to the number 6.
When set to ~1, terminals c, b, and a are selected, and the motor drive device M operates at each release interval longer than the shortest release interval.

The above is the explanation of Fig. 2.
A camera with Q'MD built into the camera body C, or a camera body C and a motor drive device [AMD
A magnetic signal connection is provided for the release interval of 1lIlth I
The U circuit 10 can be removed (also scraped).

Further, in the present invention, the time from the camera's shirt release to the rear curtain running, that is, the time when the light is illuminated, may be set by the shutter dial, or may be set by the shutter dial, or by setting the time from the camera's shirt release to the trailing curtain movement, or by setting the time from the shutter release to the trailing curtain movement, or by setting the time from the camera's shirt release to the trailing curtain movement. Of course, it may be automatically controlled.

As detailed above, according to the present invention, it is possible to detect the operation of the automatic focus adjustment device and automatically lengthen the release interval, thereby increasing the ability to release the shutter release in the in-focus state. can.

[Brief explanation of drawings]

FIG. 1 shows a circuit according to an embodiment of the present invention. FIG. 2 is a diagram showing the appearance of the camera of the above embodiment. [Explanation of symbols of main parts] Motor drive device... MD automatic focus adjustment device... 1,6 rel interval control device...... 10- 18(

Claims (1)

[Claims] 1. In an electrically driven camera that continuously repeats the shutter release, an automatic focus adjustment device that automatically brings the photographing lens into focus, and detects the operation of the automatic focus adjustment device, An electrically driven camera capable of automatic focus adjustment, characterized in that it is equipped with a release interval control device N that automatically lengthens the interval between the releases at the time of t″l:′@. In the camera according to item 1 of the scope, the camera is capable of automatic focus adjustment, wherein the release interval control device inputs brightness information of a subject, and the lower the subject brightness is, the longer the release interval is.'3.Patent. 1. The camera according to claim 1.The release interval control device f1 receives point distance information from the photographing lens 1, and the automatic release interval control device f1 is characterized in that the longer the focal length is, the longer the release interval is. (1 camera with 9 points that cannot be adjusted.