JPH02139509A - Camera with automatic focus adjusting device - Google Patents

Abstract

PURPOSE:To make photographing operation mode convenient by actuating a motor for automatic focusing whichever of a lens operation member on the side of a camera main body and an operation member on the side of a lens barrel is operated. CONSTITUTION:A specific pin to which a release signal from the camera side is sent when an exclusively-used lens is mounted on the camera is provided to the mount surface of the fixed frame 1 of the lens barrel. Further, an operation plate 17 which has a mode changeover switch 15 and two upper and lower operation buttons 16A and 16B is provided on the outside surface of the case 14 of the lens barrel. Then, when the switch is at a position SIN, AF, or SEQ.AF, a distance ring 9 is rotated to a focusing position whichever of the buttons 16A and 16B is operated to perform operation AFSTAT, so AF operation is performed not only on the camera side, but also on the lens barrel side and the operation is made more convenient.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a camera having an automatic focus adjustment device, and more particularly, an automatic focus camera having a lens drive motor that receives a signal from a focus detection means and moves a photographing lens to a focusing position. The present invention relates to a camera with an adjustment device.

In this type of conventional camera with automatic focus adjustment device,
The autofocus (AF) operation is started by operating a release operation member. However, when shooting while chasing a subject while holding the lens barrel horizontally, it would be more convenient to have an operating member on the lens barrel side in addition to the release operating member provided on the camera body. .

Additionally, in addition to the AF device, cameras that have a so-called power focus (PF) device, which adjusts the focus of the photographic lens by operating a lens drive motor according to the operator's instructions, usually do not start AF. It starts by pressing the release member, but when PF mode is selected,
It is necessary to avoid this AF start and eliminate the contradiction of AF even though it is in PF mode.

The present invention has been made in view of the above points, and includes an operation member for driving a lens drive motor of an automatic focusing device on the lens barrel side as well as a release operation when the PF mode is selected. It is an object of the present invention to provide a camera having an automatic focus adjustment device in which the automatic focus adjustment device is not driven by a member and an operation member provided on the lens barrel side is used as a power focus rotation direction indicating member.

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

1 to 4 are a perspective view, a back view, a side view, and a schematic cross-sectional view of a lens barrel in a camera having an automatic focus adjustment device showing one embodiment of the present invention.

1 to 4, a zoom ring 2 is rotatably provided on a fixed frame 1 of a lens barrel, and as the zoom ring 2 rotates, a pin 4.5 engages with a cam groove of a cam barrel 3. It moves in the direction along the optical axis O. The pin 4 is implanted in a cylindrical body 7 which is helicoidally screwed together with the front lens frame 6, and the pin 5 is implanted in the rear lens frame 8. Therefore, when the zoom ring 2 is rotated, the front group lens frame 6 and the rear group lens frame 8 move along the optical axis O according to the shape of the cam groove so that the focal length changes from wide angle to telephoto. Front group lens frame 6
A distance ring 9 is screwed together with a helicoid screw, so that when the distance ring 9 is rotated, the front group lens frame 6 rotates and moves along the optical axis O. At this time, fixed frame 1
The distance is displayed in an index window 18 provided in the outer cylinder 1a according to the rotation of the distance ring 9. An aperture ring 10 is provided near the rear end of the fixed frame 1, and rotation of the aperture ring 10 causes an aperture stage setting lever 11 (see Figure 2) to rotate, thereby determining the number of aperture stages. . The aperture blades 12 provided in the rear group lens frame 8 are stopped down by an aperture lever 13, which is controlled by the camera.

A case 14 is provided integrally with the outer tube 1a of the fixed frame 1 at the lower part of the main body of the lens barrel. A mode selector switch 15 is provided on one outer surface of the case 14, and switching between P and F is possible by switching the switch 15.
, (power focus), OFF (power off),
SIN, AF (single autofocus), SEQ
, AF (Sea Fence Auto Focus) and BAT
.

Each mode of C (battery check) can be selected. An operation plate 17 having two upper and lower operation buttons 16A and 16B is provided between the case 14 and the outer tube 1a of the fixed frame 1 on the same outer surface, that is, at a middle height position that is easy to operate with this lens barrel. It is being Operation button 16A
, 16B are for P, F, UP which, when the mode selector switch 15 is in the P, F position, presses these buttons 16A, 16B to rotate the distance ring 9 toward the short distance side by the motor, respectively. , P to rotate to the far side
, F, and DN, and when the mode changeover switch 15 is in the SIN, AF, SEQ, and AF positions, these buttons 16A.

16B is an operation button for AF 5TAT (focus start) which rotates the distance ring 9 to the focusing position, regardless of which button is pressed, and the operation buttons are shared between the PF mode and the AF mode. It has simple operability and appearance.

An in-focus trigger socket 19 is provided on the opposite side surface of the case 14. The trigger socket 19 is connected to the photographing lens 2 of the front group lens frame 6 by rotating the distance ring 9.
This socket 19 is used to take out this whitefish signal to the outside when the camera zero reaches the in-focus position.A motor drive device or winder is connected to the same socket 19 by a cord, and the remote drive device or winder shade is activated by the above whitefish signal. It can be triggered. Further, a sound switch 21 is provided on the back of the case 14, and when the switch 21 is turned upward, the switch is turned on and various warnings are emitted by sound, and the warning sound is muted. If you wish to do so, switch to the lower silent side and turn off the switch. A signal pin 22 is installed on the mount surface of the fixed frame 1 of the lens barrel to identify the camera when it is attached to a dedicated camera and to transmit a release signal.

As shown in FIG. 4, a flexible substrate 26 having a motor 23, IC chips 24, 25, etc. is housed inside the case 14.

The motor 23 is meshed and connected to the outer periphery of the distance ring 9 through a gear train 27, and the rotation of the motor 23 rotates the distance ring 9, thereby driving the photographing lens 20. At a predetermined position above the rear part of the case 14, a focus sensor 28 made of a CCD is mounted on the flexible substrate 26. Light that passes through the photographic lens 20, is reflected by a half mirror 30 of two prisms, passes through the two prisms, and is further reflected by a reflection mirror 31 is guided to the light receiving surface of the focus sensor 28. The light receiving surface of this sensor 28 is located at a position conjugate with the film surface. Therefore, distance measurement is performed using TTL incident light.

Four brush-shaped contact pieces 32 to 35 are attached to the fixed frame 1 surrounded by the case 14, and the contact pieces are wired to the board 26. The contact pieces 32 to 35 are the fifth
As shown in the figure, it comes into sliding contact with the rear outer periphery of the distance ring 9. A conductive pattern 37 is formed on the rear outer periphery of the distance ring 9.

The conductive pattern 37 has two strips 37 as shown in the figure.
a, 37b, and a comb tooth portion 37c continuous to the band portion 37b. Contact pieces 32 to 35 are contact pieces for zone 1, zone 2, common, and ADR (address), respectively. Therefore, contact pieces 32 and 34, and 33 and 34 are contact pieces for zone 1, zone 2, common, and ADR (address), respectively. A second zone switch 38, 39 is formed, and contacts 35 and 34 form an ADR switch 40. Contact piece 3
2 to 34, when the distance ring 9 is in a rotational position corresponding to the middle distance zone, the contact pieces 32 to 35 are attached to the strip portion 37a and the insulating portion 9a, respectively, at the position Po of the conductive pattern 37, respectively. , strip portion 37b.

It faces the comb tooth portion 37c. Since the contact pieces 34 and 35 always come into contact with the strip portion 37b and the comb tooth portion 37c when the distance ring 9 is rotated, the ADH switch 40 is turned on and off for each IADR when the distance ring 9 is rotated. The state of contact between the contact pieces 32 and 33 with the conductive pattern 37 differs depending on the rotational position of the distance ring 9, and when the distance ring 9 reaches the closest position, the contact pieces 32 and 3
3 is a position P on the conductive pattern 37 common to the contact piece 34.
Therefore, at the same position, the zone switch 38°3
9 are both on, and at the above position PO, the first zone switch 38 is on and the second zone switch 39 is off. Further, when the distance ring 9 is rotated to a position immediately before reaching the infinite position, the contact pieces 32 to 35 correspond to the position Pr, and a strip portion 37a is formed at the same position. Not yet.

Therefore, both zone switches 38 and 39 are off at the same position. Further, when the distance ring 9 is rotated to the infinite position, the contact pieces 32 to 35 correspond to the position poo,
Although the strip portion 37a is not present at the same position, the insulating portion 9
Since the conductive part 37d integrated with the strip part 37b is formed at the extended position of a, the first zone switch 3
8 is off, and the second zone switch 39 is on. In the end, the rotational position of the distance ring 9 is converted into a gray code by the zone switch 38, 39, and the ON of the zone switch 38, 39 is set to 0. If off is set to 1, the zone signal is (00) in the zone of the above-mentioned closest position Pn,
In the zone of position PO (01).

In the zone of the far position Pf (11), the infinite position Po.

The rotational position state of the distance ring 9 can be determined by reading these signals. In this lens barrel, when the zone switch is in the zone of the above position Po, the rotation of the motor is maintained at high speed, and when the zone switch reaches the zone of the above position Pr from the same state, the motor is made to rotate at a low speed.
The motor stops rotating when it reaches zone o. Further, the rotation of the motor also stops when the zone at the position Po reaches the zone at the position Pn. The above far position P'
By slowing down the rotation of the motor in the zone, the distance ring 9 will smoothly stop in the infinite position P2 zone, and will stop immediately before colliding with the stopper. Note that, similarly to the far position Pr, the motor may be rotated at a low speed even before reaching the zone from the position Po to the close position Pn, but this is particularly frequently used at the infinitely far position P, and its effectiveness is is large.

Further, a brush-shaped contact piece 41 is provided on the outer periphery of the zoom ring 2 in a portion surrounded by the case 14.
As shown in an enlarged view in FIG. 6, a zoom information detector 42 is configured together with a conductive pattern 45 formed on a zoom substrate 44 that is integrated with the case 14. The conductive pattern 45 includes an integrated conductive part 45a that contacts the contact piece 41 and the zoom ring 2 regardless of the rotation angle, and a conductive part 45b that is divided into multiple parts in the moving direction so that the position can be determined according to the rotation angle. Each of the conductive parts 45b is composed of a resistive part 45c connected to each other by a resistor, and each of the conductive parts 45b is connected to the contact piece 45c.
The pattern is slanted so that either side can always come into contact with 1. This zoom information detector 42 is connected to the zoom ring 2
This is to ensure that distance adjustment is always performed no matter what rotational position the zoom information detector 42 is in, and a signal corresponding to focal length information is obtained from the zoom information detector 42.

The aperture ring 46 integrated with the aperture lever 13 has a shape shown in FIG.
As shown in (B), a substrate 48 having a conductive pattern 47 is integrally fixed to the aperture lever 1.
3 is not narrowed down, as shown in the same figure (^), at least one of the fixed contact pieces 49 and 50 extending to the board 48 contacts the insulating part of the board 48 and indirectly Although the pieces 49 and 50 are kept in a non-conducting state, when the aperture lever 13 is narrowed down even slightly and the aperture ring 46 is rotated in the direction of the arrow as shown in FIG. 46, so the contact piece 49
．． 50 both contact the conductive pattern 47 and become electrically conductive. That is, the contact pieces 49 and 50 constitute an aperture interlocking switch 51 for detecting the start of aperture, and the switch 51 determines whether the lens barrel is installed in a camera before shooting or during shooting. It is possible to detect whether there is The aperture interlocking switch 51 is used to prevent the photographic lens from being driven during release, and to prevent the necessary light from entering the focus sensor 28 when the aperture is closed, which can cause malfunctions. This is to do so.

The lens barrel is configured to have the above-mentioned structure and various functions, and will be explained in more detail with reference to the drawings from FIG. 8 onwards.

FIG. 8 is a circuit diagram of an electric circuit constructed within the case 14 of the lens barrel. This electric circuit includes a power supply circuit 60, a CPU (central processing unit) 61, and a
An oscillation circuit 62 externally attached to the PU 61, an A/D converter 63 coupled to the CPU 61 via a pass line, the focus sensor 28 that sends a CCD output to the A/D converter 63, and the A/D converter 63. The zoom information detector 42 connected to the input terminal 2 of the A/D converter 63, and the input terminal 1 of the A/D converter 63. The battery voltage detection circuit 64 is connected to the output terminals 07 to 0□ of the CPU 61. The motor drive circuit 65 connected to the input terminal 1 of the CPU 61
The switch circuit 66 connected to 1 to ■8 and the CPU 61
a warning display circuit 67 connected to output terminals 01 to 03 of the CPU 61; a power holding circuit 68 connected to the output terminal 04 of the CPU 61; an in-focus trigger circuit 69 connected to the (Ilo) terminal of the CPU 61; Output terminal 0
5, and an ADR switch circuit 71 connected to an input terminal 110 of the CPU 61.

The power supply circuit 60 includes a power switch 74, a battery 75, transistors 76 to 82, and a phototransistor 83.
, DC/DC converter 84, diodes 85, 86,
Capacitors 87-89, choke coil 90, resistor 92
-99 and switches 100-102. The terminal 103 is for guiding a release signal from the camera body, and corresponds to the signal pin 22 described above. terminal 1
04 is a terminal for supplying a power supply voltage of -5V to the CPU 61 and the circuit connected to this CPU 61; terminal 10;
5 is a terminal for supplying a power supply voltage of -3 to -4.5V to the motor drive circuit 65, battery voltage detection circuit 64, etc.

The operation of this power supply circuit 60 is as shown in the flowchart shown in FIG. The power switch 74 is linked to the mode changeover switch 15 shown in FIG. 1, and turns on when the changeover switch I5 is changed to a mode position other than OFF. After this, transistor 78. When any of the switches 100 to 102 is turned on, the transistors 79 and 80 are turned on, the DC/DC converter 84 is activated, and a power supply voltage is generated at the terminals 104 and 105. The transistor 78 is turned on when a release signal is introduced from the camera to the terminal 103. The switch 100 is a switch that is turned on when the mode selector switch 15 is set to the SAT or C (battery check) mode position, and the switches 101 and 102 are the first switch.
These are switches that respectively operate in conjunction with the operation buttons 16A and 16B shown in the figure. Note that when the release signal from the camera is guided to the terminal 103, the transistor 76 is turned on, thereby turning on the transistor 78, but at this time, the transistors 81 and 82 are turned on,
A REL (release) signal is led to the input terminal 3 of the CPU 61.

When the power supply voltage is supplied to the CPU 61 from the power supply circuit 60, the CPU 61 is reset and then starts a program. At this time, in order to prevent the CPU 61 from malfunctioning due to noise when the power is turned on, the power holding circuit 68 is activated after a certain wait time. In the power supply holding circuit 68, when an "L" signal is issued from the output terminal 04 of the CPU 61 through the resistor 106, the transistor 107 is turned on, and the LED (light emitting diode) 109 of the photocoupler 108 emits light. LED
109 emits light, this light is received by the phototransistor 83 of the power supply circuit 60, which turns on the phototransistor 83, which turns on the transistor 77. When transistor 77 is turned on, the initially turned on transistor 78 . Even when the switches 100 to 102 are turned off, the transistors 79 and 80 are kept on, and power continues to be supplied thereafter. Note that the power supply holding circuit 6
Reference numeral 116 in 8 is a resistance.

The oscillation circuit 62 includes a crystal oscillator 110° oscillator capacitors 111, 112 . It consists of a capacitor 113 for P'7-on IJ set. Further, the A/D converter 63 is connected between the CPU 61 and the I10 terminal by a pass line, and is operated by the system clock from the CPU 61. This A/D converter 6
Reference numeral 3 inputs a signal corresponding to the focal length information from the zoom information detector 42 and a battery monitor voltage VBAT from the battery voltage detection circuit 64 to an input terminal 11° 2 for A/D conversion. The battery voltage detection circuit 64 uses variable resistors 114 and 115 to set the voltage vBAT according to the battery 75. The A/D converter 63 A/D converts the output of the focus sensor 28, and sends a CCD drive clock and a CCD control signal to the focus sensor 28 to drive and control the sensor 28.

The motor drive circuit 65 is connected to the motor 23. transistor 1
17-124, diode 125, 1213, resistor 12
7 to 138, and is driven and controlled by the output of the CPU 61. Describing the operation of this motor drive circuit 65, the output terminal o7 of the CPU 61. Since the transistors 117 and 124 are turned on when o9 reaches the "L° level," the transistors 119 and 122 are turned on at this time, and the motor 23 rotates to rotate the distance ring 9 toward the short distance. Furthermore, when the output terminals 08 and 01o become "L", the transistors 118 and 1.23 are turned on, which turns on the transistors 120 and 121, and the motor 23 rotates in the opposite direction to the above, moving the distance ring 9 far away. Rotate the distance. Further, when the output terminals 08 and 09 both go to the "L" level while the motor 23 is rotating, the transistors 118 and 124 are turned on, which turns on the transistors 120 and 122, thereby applying a brake to the motor 23. That is, at this time, a back electromotive force is applied between both terminals of the motor 23 by the transistor 120 and the diode 126, or the transistor 122 and the diode 125, and the motor 23 suddenly comes to a halt.

The switch circuit 66 is connected to the input terminal 11 of the CPU 61.
, 12.14 to I8, respectively.
It consists of groups 1 to 147. Switches 141 and 142 are mode switches for determining each mode state other than OFF of the mode changeover switch 15 shown in FIG.
P and F by turning on and off switches 141 and 142
, , SIN, AF, SEQ, AF, BAT, C
The state of each mode is determined. Switches 143, 144
are switches that are respectively closed by operating buttons 16A and 16B shown in FIG. Further, the switches 145 and 146 are the first and second switches shown in FIG. 5, respectively. This is the second zone switch 38,39. Furthermore, the switch 147 is the aperture interlocking switch 51 shown in FIGS. 7(A) and 7(B) above.

The warning display circuit 67 includes transistors 151 to 153;
It consists of LEDs 154-156 and resistors 157-162. Each of the transistors 151-153 is turned on when the output terminals 01, 02, 03 of the CPU 61 reach the "L" level, and at this time, each of the LEDs 154-156 becomes a display state by emitting light. The first LED 154 displays a warning about subject movement, and when the subject is moving so fast that the focusing operation cannot follow the movement of the subject, this LED 154 emits light to warn the user. In addition, the second LED 155 is used to display a warning about the short distance limit, and when the photographic lens approaches the subject too close to the subject and distance adjustment becomes impossible, this LED 155
5 emits light. The third LED 156 is for displaying a low contrast warning, and when the contrast of the subject is extremely reduced and distance adjustment becomes difficult, this LED 156 emits light in the extreme contrast state. In addition, the first
．． When the second LEDs 154 and 155 are turned on at the same time, a low light warning is issued. That is, if the background is very dark and a sufficient amount of light does not enter the focus sensor 28, accurate focusing will not be possible. The second LEDs 154, 155 both illuminate to alert the user of this. In this way, the warning display circuit 67 displays four types of warnings using the three LEDs 154 to 156. These warning displays are internal displays that the user can see when looking through the camera's viewfinder.

The in-focus trigger circuit 69 includes a selector switch 164 and a transistor 165. connected to the terminal (Ilo) of the CPU[il. Resistors 166 to 168 and contacts 19 of the in-focus trigger socket 19 shown in FIG. 3 above.
It consists of a and 19b. An in-focus trigger cord 170 is connected to contacts 19a and 19b of the in-focus trigger socket 19 by insertion into the socket 19, so that a motor trigger circuit 171 of the winder is connected via the trigger cord 170. The above changeover switch 164 has an upper three socket 191 and a trigger cord 170.
When the trigger cord 170 is not inserted, the switch 164 is switched to the contact 164a side, and when the trigger cord 170 is inserted, the changeover switch 164 is switched to the contact 164b side by the tip of the plug of the trigger cord 170, and the transistor 165 is switched to the contact 164b side. (Ilo). The switching state of this changeover switch 164 is detected by the CPU 61. Therefore, when the winder is connected by the trigger code 170, the transistor 16
5 is turned on in the focused state, and at this time, when the LED 173 of the photocapsule 172 of the trigger code 170 emits light, the phototransistor 174 is turned on, and then the transistors 175 and 176 are turned on, and the winder's motor trigger circuit +71 is turned on. The winder releases the shutter and winds the winding. Note that the reference numeral 177 in the trigger code 170 is a resistor.

The sound generation circuit 70 includes a transistor 180. PCV (piezo ceramic vibrator)] 81 and resistor 182,
It consists of 183. Transistor 180 is CPU6
When an "L" level signal is introduced from output terminal 05 of No. 1, the PCV 181 is turned on and the PCV 181 is activated to generate a warning sound. This warning sound can also be prevented from sounding by using the sound switch 21 shown in FIG. 2 above. In this case, the sound switch 21 connected to the input terminal 9 of the CPU 61 is opened.

The ADH switch circuit 71 is the AD switch circuit 71 shown in FIG.
It consists of an R switch 40, a resistor 185 to 187°, a chattering prevention capacitor 188, and a waveform shaping comparator 189, and the output terminal of the comparator 189 is C
It is connected to the input terminal I of the PU61. The input terminal '10 is the ADR counter 19 configured in the CPU 61.
0 input terminal. Therefore, when the distance ring 9 rotates, the ADR switch 40 is
When turning on and off for each DH, the ADR counter 190 counts the number of pulses (ADH) corresponding to the rotation angle of the distance ring 9, and the amount of rotation of the distance ring 9 is counted by the counter 19.
Detected by 0.

As described above, the main electric circuit inside the case 14 of the lens barrel is configured.

Next, a more detailed operation of the electric circuit of the lens barrel will be explained in accordance with a program installed in the CPU 61, with reference to the flowcharts shown in FIG. 10 and subsequent figures. First, when the mode selector switch 15 on the lens barrel is set to a mode other than OFF, the power switch 74 is turned on as described above. When turned on, the circuit enters a reset state, which initializes the CPU 61 and clears all flags.Then, after waiting to prevent malfunction until the power is stabilized, the power is maintained, and the power is maintained. The LED 109 of the circuit 68 turns on. After this, the system clock is supplied from the output terminal 06 of the CPU 61 to the input terminal 4 of the A/D converter 63. After this, it is determined which mode has been selected by the mode changeover switch 15. The mode switches 141 and 142 of the switch circuit 66 are turned on,
By turning off, BAT, C mode is (00), P, F,
Mode is (01), S IN, AF mode is (10)
, SEQ, , AF mode corresponds to code (11), so BAT.

If in C mode, battery check BCHKl, P
, F, mode, power focus operation POWE
If the mode is R, S IN, and AF mode, the routine goes to AFSINI and SEQ for single API operation, and in the AF mode, the routine goes to AFSEQ for sequence AF operation. below,
The operation will be explained for each mode.

(1) When in BAT, C (battery check) mode.

When in the BAT or C mode, the CPU 61 first performs the INBATT operation, as shown in FIG.

That is, the monitor voltage VB from the battery voltage detection circuit 64
The A/D converted result of AT is taken into the CPU 81. After this, the above voltage VBAT and a certain constant voltage
11'''I, (V, ,>V, ,) is compared, and if the voltage VBAT is higher than the voltage VI+ that can be driven sufficiently, the issuing circuit 70 generates a continuous tone and the voltage V!3
If the AT is higher than the minimum voltage VL to drive the AT lower than the above voltage I+, an intermittent sound is generated. By listening to the issuing status at this time, the user can know whether the voltage of the battery 75 is sufficient or whether it is time to replace the battery 75. The above monitor voltage V13AT is VBAT
When the voltage is VL, there is a risk of operation, so the power is turned off at this time. This power off
When the level of the output terminal 04 of 61 becomes H, the power supply holding circuit 68 becomes inactive and the LED 109 stops emitting light.

(2) When in P, F, (power focus) mode.

When in the P, F mode, as is clear from FIG. 10, the routine goes to the POWER routine shown in FIG. 12, so the battery check BCHK2 operation is performed first. The operation of this battery check BCHK2 is as shown in FIG. 16. After the operation of INBATT, the battery check BCHK2 compares the monitor voltage
If BAT≦Vt and BAT L, the power is turned off as in the above BAT and C mode, and if vBAT>V, the voltages V and V further increase.
Compare and find that ■11〉VBAT and AT
If I+, that is, VL<VBAT and Vll, then DUTY
(Duty) flag is set to 1, VII≦V13
If it is AT, clear the DUTY flag and return.

After this, returning to FIG. 12, it is determined whether or not the P, F, UP operation buttons 16A and the P, F, DN operation buttons 16B have been pressed. First, switch 1
43 (P, F, UP) is on, switch 144 (
P, F, DN) are off, the distance ring 9 rotates in the near direction, so it is determined whether the close range position Pn has been reached as shown in FIG. (referred to as a limit). When the near limit is reached, the limit warning LMTAL shown in Fig. 15 is activated.
M is performed. For the limit warning LMTALM, if the sound switch 21 is turned on as shown in the routine of oscillation gp c V 2 in FIG. After sounding a warning in the mode, it waits and returns to the AI. At this time, a warning display is also performed by emitting light from the LED 155 shown in FIG. 8 above.

If the near limit has not been reached, the pronunciation P shown in Figure 33
When the CVI routine is entered and the sound switch 21 is turned on, the sound generation circuit 70 is activated and the PCV 18 is activated.
1 makes a "beep" sound in the manner of oscillation 1. If the sound switch 21 is off, no sound is produced and the process returns. After this, the direction flag is cleared and the motor drive MDRI
The routine moves to VI (see Figure 27), where the motor is driven by IADH at a short distance, and then AD is driven.
After the count number N is set in the R counter 190,
It is again determined whether the switch 143 is on or off. If it is off, it returns to A1, and if it is on, after a wait, a count of (N-1) is performed, which becomes N-0.
is repeated until . If it becomes N-0, it is again determined whether the limit is near or not. That is, N-
If the switch 143 is turned off before the value reaches 0, the state returns to AI, and if the switch 143 continues to be on even after reaching N-0, the next near limit determination is performed. After this, if the limit is near, the above limit warning L
MTALM, and if the near limit has not been reached, wait after motor drive MDRIv1, then P, F.

While UP is being performed, motor drive MDRIVI is operated until reaching the near limit.

Now, to describe the operation of the motor drive MDRIVI, as shown in Fig. 27, the battery check BCHK
2 is performed, it is determined whether the direction flag is 1 (infinite) or 0 (close). If the direction flag is 1, the far direction drive MDI routine (second
(See Figure 8). If the direction flag is O, AD
It is determined whether the output of the R switch circuit 71 (hereinafter referred to as ADR output) is at H level. If the ADR output is at the L level, the motor brake will be applied if it is at the near limit, but if it is not at the near limit, the near direction I will be applied.
After the operation of ADR drive MDSI (see Figure 29), A11
Return to If the ADR output is at H level, at this time,
The above MDSI operation is repeated until the ADR output reaches the L level. When the ADR output reaches the L level, the motor brake is applied, and after a wait, the motor returns.

Regarding the near direction IADR drive MDSI, as shown in FIG. 29, first, the motor drive flag is inverted, and it is determined whether the motor drive flag is at H level or not. Assuming that the motor drive flag is currently at H level, for example,
The motor 23 is driven in the near direction, waits, and then turns off and returns. In Fig. 27, ADR
This operation of MDSL is repeated until the output reaches the L level, so in the second operation, the motor drive flag goes to the L level and the motor is braked.

Then, it is determined whether the DUTY flag is 1 or O, and if it is 1, then Vll>VDAT, so after two operations, the motor is turned off, and if it is 0, VI+≦BA
Since it is T, the motor is turned off after one wait.

That is, the on/off duty ratio of the motor is changed in accordance with the voltage of the battery 75 to vary the time during which the brake is applied. After all, in the operation of MDRIVI in FIG. 12, the motor repeats on and off operations in the near direction in MDSI to drive for IADR.

In other words, by performing the above-mentioned operations, when the P, F, and UP pushbuttons 16A in FIG. , each time the operation is performed, a sound is generated in the form of oscillation 1.

When the push button 16A is continuously pressed, the distance ring 9 will rotate continuously. When the near limit is reached, a sound is generated in the oscillation 2 mode to warn the user of the near limit, and at the same time, the motor is braked to stop the distance ring 9 from rotating.

Next, returning to FIG. 12 again, switch 143°144,
That is, when P, F, UP, P, F, and DN are all off, if the REL (release) signal is being led, it returns to AI, and if it is not being led, the power is turned off. When switch 143 is off, switch 144
is on, the distance ring 9 rotates in the far direction, so the first
The routine moves to the infinite limit check FL CHK 1 shown in FIG.

In FLCHKI shown in FIG. 13, a long distance limit (hereinafter referred to as a long limit) is first determined. If the far limit is reached, the limit warning LMTALM is performed, but if the far limit is not reached, the PCVI operates to generate a sound in the oscillation 1 mode, and the direction flag is set to the infinite direction (1
).

After this, the program operation of the motor drive MDRIVI is started. The operation of MDRIVI at this time is the 28th
As shown in the figure, since this is a programming operation of the far-direction drive MDI, it is first determined whether or not the ADH output is at the L level. If the ADR output is at H level and reaches the far limit, the brake operation BRKI is performed, but if it has not reached the far limit, the far direction I ADR drive MDS
After operation 2 (see FIG. 30), the process returns to A12. A.D.
When the R output is at H level, far direction IADR drive M
After DS2, when the ADR output goes to H level, it is determined whether or not it is at the far limit, and if it is at the far limit, the brake operation goes to BRK 1, but if it is not at the far limit, the above-mentioned operation continues until the ADR output goes to L level. The operation of MDS2 is performed, and when the ADH output becomes L level, the above-mentioned braking operation is performed.

In this way, after the above MDRIVI operation, A
A count number N is set in the DR counter 190. After this, if the switch 144 is off, it returns to At, and if the switch 144 is on, it waits and returns to (N-1).
is counted, and this is repeated until it reaches N-0.

If N-0, as shown in FIG. 14, the far limit is determined, and if it is the far limit, the above LMTALM
If a warning is issued and the far limit has not been reached, as long as the switch 144 is on, the MDRIVI and then wait operations are repeated until the far limit is reached.

Therefore, when operating the push buttons IGB of P, F, and DN in Fig. 1, the distance ring 9 rotates by a small angle in the long distance direction, and each time the operation is performed, the distance ring 9 oscillates. Pronounce it in the manner of 1. When the push button 1ftB is kept pressed, the distance ring 9 will rotate continuously. and,
When the far limit is reached, a sound is generated in the mode of oscillation 2 to warn the user of the far limit, and at the same time the motor is braked to stop the distance ring 9.

Now, regarding the far direction IADR drive MDS2 in the far direction drive MDI, as shown in FIG. A determination is made. When the motor drive flag is at H level, the motor 23 is driven in the far direction, and after waiting, the motor 23 is turned off.

When the motor drive flag is at L level, the motor 23 is braked. At this time, if the DUTY flag is 1, the motor 23 is turned off after two waits, and if it is 0, the motor 23 is turned off after one wait. That is, even in the case of this far-direction drive, the time during which the brake is applied differs depending on the state of the battery monitor voltage VBAT.

(3) When in SIN, AF (single autofocus) mode.

In the SIN, AF mode, as is clear from FIG. 10, the AFSINI program operation shown in FIG. 17 is performed. In AFSINI, after battery check BCHK2, it is determined whether the REL signal is on or off.
If it is on, the power is turned off after the operation of AFSIN2 shown in FIG. 18, and if the REL signal is off, the AFSTAT pushbuttons 16A, 16B,
If the switches 143, 144 are off, the power is off, and if any of the AFSTAT switches 143, 144 is on, the power is off after the operation of AFSIN2.

The operation of the upper 1dAFsIN2 is as shown in FIG.
After the operation of AFSIN3 (see FIG. 20), it is determined whether the LL (low light) flag is 1 or 0, and if it is low light (=1), the first LE of the '3 notice display circuit 67
Both D154 and the second LED 155 are turned on and a low light warning is displayed. If it is not lowlight (-
0), it is determined whether the AF status flag is 0 or not. If the AF status flag is not 0,
That is, if any one of the short distance flag, subject movement flag, and low contrast flag is 1, the warning operation of POY3 is performed, and the short distance warning, subject movement warning, and low contrast warning are issued. and return. These warnings are also issued by the warning display circuit 67. If the AF status flag is 0, the PCV
After the I sound is performed to inform the user that it is a royal palace, the process returns after the WIND action.

The operation of WIND is as shown in Figure 19.
or a motor drive device) is connected, an output to turn on the winder is generated.

Now, to describe the operation of AFSIN3 in FIG. 18, as shown in FIG. 20, after the RETRY flag is cleared, the AF small loop AF count number is set. Thereafter, after the AF status flag is cleared, routine AF operation for A11 distance is performed. This AF program operation is performed by converting the CCD output from the focus sensor 28 into an A/D converter as shown in FIG.
Import the converted results into the CPU 61 (INCCD)
, we will convert this into an algorithm and perform a low contrast test. After this, return to Figure 20 and if the contrast is low, subtract 1 from the AF small loop count number and
Return to and repeat this until the AF small loop count is 0.
When this occurs, a low contrast warning display will be displayed. This warning display is made by the LED 156. If the contrast is not low, the ADH shown in Figure 32
The following actions are performed. As is clear from FIG. 32, this ADR operation is based on the A/D output from the zoom information detector 42.
The results after e-conversion are imported into the CPU 61 (INZOOM
), motor 23 (distance ring 9) considering this zoom factor
The number of ADRs to be driven is calculated. If the ADR value thus calculated is smaller than a certain maximum value MAX, the ADR value is left unchanged, but if the ADR value>MAX, this ADR value is forcibly set to ADR value - MAX. After this, a comparison is made between the ADR value and the PCALL value. The PCALL value is a threshold for determining whether autofocus is in the extremely accurate δIIJ distance state. If the amount of movement from the focus plane is Δd, then the number of pulses required to move this Δd is be. ADH
If <PCALL, the motor is driven by low-speed pulses by MDRIV8 shown in FIG. ADR≧P
If it is a CALL, the RETRY flag is 0 at the time of the first distance measurement calculation, so after the RETRY flag is set at this time, it goes to A3 shown in Figure 21 and the ADR value this time is 2.
The light is turned on, and the motor is driven at high speed by the FvI DRIV4 shown in FIG. 24, which will be described later. Then, 1 is subtracted from the AF small loop count number, the process returns to A4, and the ADR value is calculated again based on the distance measurement AF. After this, RE
Since the TRY flag is set to 1, go to 5IN32.

By repeating such operations, the current ADR value and the previous ADR value are compared at S1NB2. This time A
If the DR value≧the previous ADR value, it means that the focusing operation of the photographic lens cannot follow the subject movement speed at this time, so the subject movement flag is set and a warning display of the subject movement is performed. This warning display of subject movement is performed by emitting light from the LED 154 in the warning display circuit 67 in FIG.

If the current ADR value is the previous ADR value, now [i! J.A.D.
The R value is stored, and the operations below MDRIV4 are repeated until ADH<PCALL.

Note that the determination of the warning display for subject movement is not necessarily limited to comparing the current ADR value and the previous ADR value as described above, but, for example, comparing the previous ADR value X (1/2) and the current ADR value. After comparison, if the current ADR value is not within 50% of the previous ADR value, the above warning may be displayed.

Here, to describe the motor low-speed pulse drive MDRIV8 in the routine of AFSIN3, the second
As shown in Figure 2, after performing battery check BCHK2, it is determined whether the above ADR value is 0 or not, and if the ADR value is -0, the AF status flag is cleared, and the ADR value must be -0. For example, ADR counter 190
Set the above ADR value to . After this, if the direction flag is 0 (closest direction), the motor 23 is driven in the short distance direction, and if the direction flag is 1 (infinite direction), the FDRIV
The routine moves to I and is driven in the far direction. From the ADR value set in the ADR counter 190 by driving this motor 23, the IA from the ADH switch 71 is determined.
Subtraction is performed in hardware for each DR pulse or manual effort.

If the direction flag is O and the near limit is reached, motor 2-3
After the brake is applied and the weight is applied, the ADR value -0
When this happens, the process returns to AI and the AF status flag is cleared. At this time, if ADH[kiO], the short distance flag among the AF status flags is set, and the LED 155 of the warning display circuit 67 displays a short distance W'6.

When the above direction flag is 1 and the state shifts to FDRIVl (complex direction drive), this FDRIVI is at the far limit, as shown in Fig. 23, one motor is braked, and after a wait, the upper shift is applied. Returning to AI in FIG. 22, the AF status flag is cleared. If the far limit has not been reached, the motor is driven in the far direction, and after weighting, the remaining ADH (when Q is 5 ADR or more, returns to A in Fig. 22, and is further driven in the far direction,
When the remaining 4 ADR is reached, the motor is braked, and after a wait, A8 is reached. Then, the motor is driven in the far direction until the count ends, and the remaining ADR value is 2AD.
Even when R or IADR is reached, the brake is applied in the same way each time, and the motor is driven by low-speed pulses. And A
When the ADR value set in the DR counter 190 finishes counting, the motor brake is activated. After the wait, if the overshoot exceeds the predetermined position, the amount of overshoot is set in the ADR counter 190, the direction flag is inverted, and the process shifts to step 11j and MDRI V8 motor drive.

Furthermore, during the operation of the above MDRIV8, when the direction flag is O and the motor is driven in the near direction, the process shifts to A6 in FIG. The motor is driven in the near direction until it reaches 4 ADR, and when the remaining 4 ADR is reached, the motor is intermittently braked and decelerated, and stops at the end of the count. At this time, if there is an over amount, the direction flag is similarly inverted and the MDRIV
8 is performed.

Regarding the operation of the motor drive MDRIV4 in FIG. 21, as shown in FIG. 24, first a battery check BCHK2 is performed, and then the stored ADRti
A value obtained by subtracting the P minus value from P is set in the ADR counter 190. The P-minus value is a value predicted in consideration of overshoot. As a result, ADR counter 1
If the set value of 90 is not 0, determine the direction flag,
When the direction flag is 0 (closest direction), the motor is driven in the near direction. When the motor is driven in the near direction and the set value of the ADR counter 190 becomes O, the brake operation B shown in FIG.
RKI is performed, and the motor 23 is braked to stop the lens drive. Even if the set value of the counter 190 does not reach O, if it reaches the near limit, the motor is braked at this time as well. Further, when the direction flag is 1 (infinite direction), the program proceeds to the far direction limit check DLEFTI program operation.

The operation of the far direction limit check DLEFTI is as follows.
As shown in the figure, it is first determined whether the far limit is reached, and if the far limit is reached, the brake BRKI is operated, but if the far limit is not reached, the low speed zone (position P in Fig. 5) is performed. It is determined by the gray-coded signals from the zone switches 38 (145) and 39 (146) whether the motor is in the low speed zone or not. When the low speed zone is reached, the motor 23 is braked by shifting to the far direction drive of the IADR of MDRI V 1, and after waiting, the ALo
Return to Then, the value set in the counter 190 is 0.
, the above BRKI operation is performed and the motor 23 1
01 rotation stops 1]. Therefore, when the photographing lens is driven in the infinity direction and reaches the zone at the above-mentioned position Pr, the lens drive shifts from a high speed state to a low speed state and the brake is applied, so that the lens is stopped smoothly at the position Poo. becomes.

(4) When in SEQ, AF (Sea Fence Auto Focus) mode.

In the SEQ, AF mode, as is clear from FIG. 10, the AFSEQ routine shown in FIG. 35 is performed. In AFSEQ, battery check B
After CHK2, it is determined whether the REL signal is on or off, and if it is on, the operation shifts to AFSIN2 (see FIG. 18).

That is, in this SEQ and AF mode, when a release signal from the camera is input, SIN.

AF mode operation is performed. When the REL signal is off or after the above AFS IN2 operation is performed, the AF status flag is cleared and the AFSTA
When either of the T switches 143, 144 is turned on, the operation of AFSIN3 (see FIG. 20) is performed. After this, it is checked whether all the AF status flags are cleared, that is, whether the low contrast, close distance, limb movement, and low contrast flags are cleared. If they are cleared, it is determined that the focus is OK. After the determination is made, the PCVI operation, that is, the sound of oscillation mode 1 is performed to notify the user that the focus has been achieved, and the WIND operation is performed. After this, the process returns to A13, so while either of the switches 143 and 144 are turned on, the focusing operation will continue, and each time the focus is achieved, the above sound will be generated and the winder will be connected. If so, trigger outputs are sequentially sent to the winder.

When both AFSTAT switches 143 and 144 are turned off, the above-mentioned focus OK check is performed, and if focus is OK, it is determined whether the REL signal is on or off, and if No. 15 is off, the REL signal is checked. Power off. After turning off the switches 143 and 144, if the focus is not OK, the PCV2 operates, that is, the sound of oscillation mode 2 is performed to warn the user and the power is turned off.

As described above, according to the present invention, the following excellent effects are exhibited.

The operation section for performing the camera's AF operation is provided not only on the camera body side but also on the lens barrel side, making shooting operations even more convenient. Also, when the PF mode is selected, the operation of the AP device is prohibited. , and since the lens barrel side operating member is used as the PF rotation direction indicating member, very efficient operation can be performed.

[Brief explanation of the drawing]

1 to 4 are a perspective view, a back view, a side view, and a schematic cross-sectional view, respectively, of a lens barrel in a camera having an automatic focus adjustment device showing one embodiment of the present invention, and FIG. Oblique R of the distance ring in Fig. 1 above, ! 6 is a perspective view of the zoom information detector in FIG. 4 above, and FIGS. 7(A) and (I3) are views of the aperture interlocking switch in FIG. 4 above before and after the aperture operation, respectively. 8 is a front view of the lens barrel shown in FIG. 1 above; 7 is a circuit diagram; FIG. 9 is a flowchart showing the operation of the power supply circuit in FIG. 8; 10 is a front view during aperture operation; 35 are flowcharts showing the program operation of the CPU in FIG. 8 above. 15 (141, 142)...The mode is set by switching (
mode switch) 18A, 18B (143, 144)...Operation button 38.39...Zone switch (zone signal generating member) 20......Photography Lens 21...
......Sound switch 22.103...
...Signal pin 23 for release...
·motor

Claims (2)

[Claims] (1) In a camera having an automatic focus adjustment device having a lens drive motor that receives a signal from a focus detection means and moves the lens to a focus position, a release operation member provided on the camera body and a lens barrel are provided. a lens barrel-side operating member disposed above; and a starting means for starting a lens drive motor of the automatic focusing device when either the release operating member or the lens barrel-side operating member is operated. A camera having an automatic focus adjustment device, comprising: (2) The camera having the automatic focus adjustment device further includes a power focus device that drives the lens drive motor to adjust the focus of the photographing lens according to an operator's instructions, and when the power focus device is selected, , wherein driving of the automatic focus adjustment device by the start of operation of the release operation member is prohibited, and the lens barrel side operation member is used as a power focus rotation direction indicating member. Camera with automatic focusing device.