JPH02199416A - Optical system controller for camera - Google Patents

Abstract

PURPOSE:To easily change a reference position and to improve focusing accuracy by outputting a position signal when a photographic lens in movement reaches the reference position, and counting a specific number of pulses after the reference position is reached and stopping the movement. CONSTITUTION:The photographic lens A is moved in the optical-axis direction by a motor which constitutes a lens moving means B and controlled with motor driver control signals LDL and LDR from a control means C. The control means C operates the movement quantity of the photographic lens according to the distance measurement information of a distance measuring means D to control the lens moving means B. The stop position of the photographic lens a is determined with the position signal from a lens position detecting means F and the lens driving signal from a pulse output means E and when the photographic lens A in movement reaches the reference position, the position signal is outputted to count a specific number of pulses after the reference position is reached, thereby stopping the movement. The stop position is determined by utilizing the position signal by a contact pattern provided on an electric circuit board to easily change the reference position.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an optical system control device for a camera that stops a photographic lens at a predetermined position.

[Prior Art] Some cameras automatically move a photographic lens from an initial position to a focusing position.

This movement of the photographic lens is performed by a lens moving means such as a motor. For example, as disclosed in JP-A-62-136626, the photographic lens is moved in the optical axis direction by a motor, and the rotation of the motor causes the There are devices that count the pulses that occur and stop the camera at the in-focus position.

[Problem to be solved by the invention] In such an autofocus camera, the pulses from the initial position of the photographing lens are counted and the lens is stopped at a predetermined focusing position, and this initial position determines the focusing accuracy. This is a major factor.

By the way, this initial position is the reference position when moving the photographing lens in the optical axis direction, and if this reference position is not accurate, the starting point for counting the number of pulses will be shifted, so it is difficult to obtain the desired focusing accuracy. Can not. For this reason, for example, if the reference position is provided by mechanical means such as a stopper, the structure becomes complicated, and furthermore, the reference position cannot be changed easily.

This invention was made in view of the above points, and it obtains positional information of the photographic lens, has a simple structure, makes it easy to change the reference position, and also accurately stops the photographic lens at a predetermined position to improve focusing accuracy. The object of the present invention is to provide a camera optical system control device that improves the optical system control device.

[Means for Solving the Problems] In order to solve the above-mentioned problems, an optical system control device for a camera according to the present invention includes a lens moving means for moving a photographing lens in the optical axis direction, and a pulse generating means by the operation of this lens moving means. pulse output means for outputting a pulse, lens position detection means for outputting a position signal when the photographing lens reaches a reference position, and control means for counting a predetermined number of pulses after detecting the position signal and stopping the movement of the photographing lens. It is characterized by having the following.

Further, the lens moving means has a motor, and the pulse output means generates pulses according to the rotation of the motor, and the control means counts a predetermined number of pulses after detecting the position signal and reverses the motor at high speed. The brake can be applied to cut off the power and stop the movement of the photographic lens.

[Function] In order to obtain the position information of the photographic lens, the camera optical system control device of the present invention outputs a position signal as soon as the moving photographic lens reaches the reference position, and outputs a position signal to obtain the position information of the photographic lens. Count the number of pulses and stop the movement. In this way, since the reference position is determined and the pulses are counted from this position, it is possible to accurately stop the lens at a predetermined position, and the focusing accuracy is improved. Furthermore, this stopping position is determined by a position signal from a contact pattern provided on the electric circuit board and by counting the pulses generated by the movement of the photographing lens. By changing the position of this pattern, the reference position of the photographing lens can be easily determined. can be changed.

Further, in this control means, the photographing lens is moved by the rotation of the motor of the moving means having a motor, and a predetermined number of pulses output by the rotation of this motor are counted after detecting the position signal from the position detecting means. Since the motor is reversed at high speed and then stopped by applying the brake and cutting off the power supply, it is possible to accurately stop the motor at a predetermined position without overrun or the like.

[Embodiments] Hereinafter, embodiments of the present invention will be described in detail based on the accompanying drawings.

FIG. 1 is a schematic block diagram of the optical system control device for a camera according to the present invention, FIG. 2 is a plan view showing the lens position detection means, and FIG. 3 is an operation time chart showing the movement of the photographing lens.

The photographic lens A of this camera is moved in the optical axis direction by a lens moving means B, and is automatically stopped at a focus position. This lens moving means B is composed of a motor, and the motor driver control signal L from the control means C is
Controlled by DL and LDR.

The control means C calculates the amount of movement of the photographic lens A based on distance measurement information from the distance measurement means, and controls the lens movement means B. From the operation of this lens moving means B, the pulse output means E outputs a pulsed lens drive signal AFC, and the stop position of the photographic lens A is determined by the lens position signal SEP from the lens position detection means F and the lens from the pulse output means E. Determined by drive signal AFC.

As shown in FIG. 2, this lens position detection means F includes a power supply contact pattern F2 and a switch contact pattern F3 on an electric circuit board F1. F4. F5 F6F7 are provided, and the respective contact patterns F2 to F7 are connected to the control means C via terminals F8 to F13. This contact pattern F
The switch contact piece F14 moves on the lenses 2 to F7 in conjunction with the photographing lens A, the photographing lens A is moved in the optical axis direction, and position information is sent to the control means C. When the switch contact piece F14 reaches the position of the switch contact pattern F3, the photographing lens A reaches the collapsing stop position Y1, the position of the switch contact pattern F4 is the initial position Y2 for normal shooting, and the position of the switch contact pattern F5 is the normal shooting position. The feed-out amount count base point Y3 for photography reaches the initial position Y4 for close-up photography at the position of the switch contact pattern F6, and the feed-out amount count base point Y5 for close-up photography is reached at the position of the switch contact pattern F7.

In order to store the photographic lens A and stop it at the collapsing stop position Y1, as shown in FIG. 3, the control means C sets the motor driver control signals LDL and LDR high to apply the brake and prepare for starting the motor. Then, the motor driver control signal LDL is set to high and the motor driver control signal LDR is set to low to rotate the motor at high speed and move the photographing lens A.

Then, the switch contact piece F14 is the switch contact pattern F.
When the reference position 3 is reached, the lens position signal SEP is output, and a predetermined number of AFC pulses are counted from this lens position signal SEP, and the motor driver control signal LDL is set low and the motor driver control signal LDR is set low to start the motor. Reverse high speed and reduce speed. Then, the motor driver control signals LDL and LDR are set high to apply the brakes, and the power hold signal PHM is
is set to low, the power is cut off, and the photographic lens A is stopped at the moving and collapsing stop position Y1.

In this way, since the reference position is determined and the predetermined pulses are counted from this position, the barrel can be accurately stopped at the predetermined collapsing stop position Y1, and by using this position as the reference position of the photographing lens A, focusing can be performed. Improves accuracy. Further, the collapsing stop position Y1 is determined by a contact pattern provided on the electric circuit board F1, and by moving the electric circuit board F1 and changing the position of the contact pattern, the position of the photographic lens A can be easily adjusted. Can be changed.

Embodiments to which the camera optical system control device of the present invention is applied will be described in more detail below.

4 to 9 show a camera to which the present invention is applied; FIG. 4 is a front view of the camera, FIG. 5 is a rear view of the camera, FIG. 6 is a plan view, and FIG. 8 is a view showing the display on the finder, and FIG. 9 is a view showing the display on the back cover.

Composition of the camera body As shown in FIG. 7, the camera includes a main body 10, a front cover 20,
It is composed of a decorative panel 30 and a back cover 40, and a front cover 2
A decorative panel 3o is engaged with the front side of the front cover 2.
0 is engaged and screwed so as to cover the main body 10. Back M
40 and the battery cover 41 are integrally assembled to a bearing portion 42a of a main body mounting body 42 via a hinge shaft 43, and the main body mounting body 42 is engaged with the main body 10 and further fixed with screws.

The main body 10 is formed with an unexposed film storage chamber 14 and an exposed film storage chamber 15 with an image frame section 13 in between. The cartridge 1 is stored in the unexposed film storage chamber 14 and the exposed film F is provided in the exposed film storage chamber 15 and is wound up by a roll 16.

A front base plate 17 is provided in the center of the main body 10, and a lens barrel frame 2 equipped with a photographing lens 5o is mounted on this front base plate 17.
2 is provided integrally with the lens barrel 51 and movable in the optical axis direction,
It is designed to collapse.

Further, the upper surface of the front cover 20 is provided with a release button 2, a close-up button 3, and a main switch button 4.

Photographing lens The photographing lens 50 is composed of four lenses in four groups, and is attached to the lens barrel frame 22 via supports 52 and 53, and the lens barrel frame 22 is attached to the lens barrel 51. This photographing lens 50 is of a between-win type in which a shutter 54 is disposed between the lenses.

The finder mechanism uses an Alvada type bright frame see-through finder.This finder 60
Displays as shown in Fig. 7 are provided, including shooting range frames 61, 62, AF frame 63, rough distance measurement completion (lit) and distance warning (blinking) displays 64, and close-up mode (lit). A display 65, a grit mark 66, etc. are provided.

During photographing, the focus adjustment mechanism changes the distance between the photographing lens 50 and the film surface according to the distance to the object, and adjusts the focus so that the image of the object is correctly focused on the film surface. As a distance measuring mechanism for this focus adjustment, a light emitting AF lens 70 and a light receiving AF lens 71 are provided on the upper part of the front base plate 17, and are covered with AF windows 72 and 73 of the decorative panel 30. distance is used. A lens barrel 51 holding a photographic lens 50 is extended by the drive of a motor 170, and the lens group is driven straight to perform focus adjustment. The lens barrel 51 has a photographing window 55 on the front side, and this photographing window 55 is covered with a lens barrier 140 to protect the photographing lens 50 inside.

222Ku2Hada 1 The shutter mechanism has the function of providing the necessary amount of exposure to the film over time and the function of blocking unnecessary light outside of the exposure time. A shutter mode 80 is driven to open and close the shutter 54, which is a program shutter and further uses a self-timer.

For the self-timer, operate the remote switching button SS1 (described later) to switch to self-timer mode, then press the release button 2.
It operates when you press the release button 2, and about 10 seconds after pressing the release button 2.
After seconds have elapsed, the shutter 54 opens and closes. When the self-timer is operating, the self-timer display light emitting diode 5
LED 214 lights up for about 7 seconds and then blinks for about 3 seconds.

When the opening/closing operation of the shutter 54 is completed, the self-timer mode is automatically canceled and the mode returns to the automatic strobe light emission mode. If it is desired to cancel the self-timer mode while the self-timer is operating, the main switch button 4 can be pressed.

Automatic Exposure Mechanism In order to give proper exposure to the film, it measures the brightness and darkness of the light that falls on the screen on the subject side and adjusts the amount of exposure. A CdS (cadmium sulfide) light receiving element 90 is used to convert an electrical signal according to the amount of incident light. This light receiving element 90 is attached to the front base plate 17 and covered by the AE light receiving window 91 of the front mounting panel 30. Exposure control interlocking range is film sensitivity 15O100
The EV value of the subject brightness is in the range of 5 to 17, and when the EV value is 9 or less, the flash is automatically switched to automatic flash emission.

This camera uses film in a cartridge with a DX code, and the film sensitivity is automatically set from 15O50 to 3200 as soon as the film is inserted into the camera.
All non-DX films are automatically set to a sensitivity of 15O100.

Strobe mechanism A flash tube 100 of the strobe mechanism is fixed above the unexposed film chamber 14 of the main body 10 and is covered by a window 101 of the decorative panel 30. In the automatic strobe light emission mode, the flash is automatically emitted when the subject brightness is lower than a predetermined value, and is always automatically charged, and the capacitor 7 of the charging circuit is arranged close to the exposure film storage chamber 15 of the main body 10.

Film Winding Mechanism The film winding mechanism uses an automatic winding method using a motor 110 and is driven via a winding unit 111. Autorot film rewinding mechanism that starts when the release button 2 is activated after closing the back cover 40.The film rewinding mechanism automatically rewinds when the last frame has been photographed, and automatically rewinds when the rewinding is complete. Stop at.

For rewinding, the film counter is decremented and the film feed mark is displayed in the opposite direction.

In the case of DX film, rewinding is automatically stopped after the leading edge of the film is wound into the cartridge, and in the case of non-DX film, rewinding is automatically stopped leaving the leading edge of the film intact.

■ The camera back 40 has a control display section 12 for auto date and shooting information.
0 is provided through the back cover base plate 44, and a film confirmation window 6 is roughly formed. Further, the LCD decorative plate 130 of the camera back 40 includes a date display section 121 and a shooting information display section 12.
2 is provided. Furthermore, mode switching button SS1
and a date moto switching button SS2, a correction point selection button SS3 for selecting a correction point for year, month, day, and hour, and an addition button SS4 for adding up the date display.

Each time the mode switching button SSI is pressed, the automatic light emission mode, forced light emission mode, non-light emission mode, and self-timer mode are cycled through in this order. In the automatic strobe light emission mode, the strobe automatically emits light when the subject brightness is below a predetermined brightness, and in the forced flash light mode, the strobe always emits light every time a photograph is taken.

In addition, in the non-emission mode, the mode switching button SSI
If you keep pressing , it will switch from self-timer mode to film rewind mode, and press mode switch button S81.
By pressing the release button 2 while pressing , rewinding of the film is started. When rewinding is complete, the camera automatically returns to automatic strobe firing mode.

υ One 3V lithium battery 8 is housed in the battery compartment 18 of the main body 10, and can be replaced by the user by opening and closing the battery cover 41. In addition, it functions as an autodate and also as a backup power source for the main power source.
One coin battery 9 is provided in the battery storage chamber 45 of the back cover 40.

Auto Date As an auto date, a digital clock with a liquid crystal display is built into the control display section 120, and the date display section 121 provided on the LCD section decorative plate 130 on the back M40 displays "year, month, day,"
"Month/Day/Year", "Day/Month/Year", "Date/Hour/Minute" or "rOFF mode" are displayed, and the above-mentioned date mode switching button S82 and correction location selection button SS3 for selecting the correction location for the year, month, day, and hour are displayed. , is adjusted by operating the addition button SS4 for adding the date display.

The photographing information display section 122 on the photographing information display back M40 includes a battery remaining amount display 122a and a film counter 12 as shown in FIG.
2b and a film feed indicator 122C.

In addition, a strobe charging mode 122d, a self-timer mode 122e, an automatic flash mode 122f, a forced flash mode 122g, and a non-flash mode 122h are switched and displayed, and all displays are liquid crystal displays.

"Block"! 11 Figure 10 is a cross-sectional view of the lens barrel, and Figure 11 is the XI of Figure 10.
-XI sectional view, FIG. 12 is a double-cut sectional view of FIG. 10, and FIG. 13 is a shop-to-store sectional view of FIG. 11.

As shown in FIG. 11, a support frame 21 is attached to the front base plate 17.
A lens barrel 51 is provided on the support frame 21 so as to be movable forward and backward in the optical axis direction, and the lens barrel 51 is collapsible. Furthermore, the lens barrel frame 22 is fixed to the lens barrel 51, and the two operate as one.

A support portion 22a formed at the lower end of the lens barrel frame 22 has a bearing 15.
7 on a guide shaft 158, and, as shown in FIG. 12, is movably supported on a drive shaft 160 via a female screw bearing 159. One end of the guide shaft 158 is attached to the presser plate 161, and the other end is attached to the front base plate 1.
7, and one end of the drive shaft 160 is fixed to the front base plate 17.
The other end is rotatably supported by a presser plate 161 fixed to the front base plate 17 via a bearing 162, and the rotation of the drive shaft 160 moves the lens barrel frame 22 in the optical axis direction. Make a straight movement. A tip 163a of a position regulating member 163 pushed through the front base plate 17 is in contact with the support portion 22a of the lens barrel frame 22, and this position regulating member 163 is supported by the front base plate 17 via a spring 164 and is not driven. Backlash between the shaft 160 and the female threaded bearing 159 of the lens barrel frame 22 is absorbed so that the lens barrel frame 22 can operate accurately. The female screw bearing 159 is supported by a presser plate 165 fixed to the support portion 22a of the lens barrel frame 22, and this presser plate 165 prevents the female screw bearing 159 from coming off from the lens barrel frame 22. .

The drive shaft 160 is provided with a drive gear 166, and as shown in FIG. 10, the drive gear 166 is connected to an intermediate gear 167.
Output gear 171 of motor 170 via 168, 169
When the motor 170 is driven, the power is transmitted to the drive gear 166 via these intermediate gears 167, 168, 169, thereby rotating the drive shaft 160.

The motor 170 is provided with a rotary blade 172, and the rotation speed is detected by a photocoupler 173 and used as control information for moving the lens barrel 51 in the optical axis direction. Note that a photocoupler is a detection element in which a light source and a light-receiving element are arranged facing each other, and detects whether or not there is an opaque object between the light source and the light-receiving element.

Further, as shown in FIG. 11, an operating member 174 is provided on the mounting portion 22a of the lens barrel frame 22, and this operating member 174
A contact piece 175 is provided. As shown in FIGS. 11 and 13, this contact piece 175 is adapted to slide on a control board 176 in conjunction with the lens barrel 51. This control board 176 is attached to the wall 17b of the front base plate 17, and the control board 176 is provided with a power supply contact 175b and camera body side contacts 175C to 175g.
When the contact piece 175 is extended in the optical axis direction, the contact piece 175 moves to the collapsing stop position Y1, the initial position Y2 for normal photography, the base point Y3 for counting the amount of advance for normal photography, the initial position Y4 for close-up photography, and the base point for counting the amount of advance for close-up photography. The information of Y5 is given to the control section, and these constitute a switch that detects the position of the photographic lens 50. This switch functions as a lens position switch or an AF trigger switch depending on the relationship with the contacts 1750 to 175g on the camera body side. This control board 176 has a protrusion 176a at one end engaged with a recess 17c of the front base plate 17, and a stopper 177 of the presser plate 161 fixed at the other end 176b to the front base plate 17.
．． 178, and is supported movably in the optical axis direction.

A position adjustment window 176C is formed in this control board 176, and an adjustment bolt 179 is screwed onto the wall 17b of the front base plate 17 through this position adjustment window 176C. This adjustment pole)・179 mounting shaft 179a
is located at a position offset from the center of the head 179b, and the control board 176 is moved in the optical axis direction by rotation of the adjustment bolt 179 to adjust the position.

As shown in FIG. 10, a shutter drive mechanism and the like are arranged inside this lens barrel 51, and a motor 80 is driven by operating the release button 2, and the power is transmitted from an output gear 81 to intermediate gears 82, 83, 84, . Shutter ring 8 through 85
6, the shutter ring 86 is rotated, and the three shutter blades 54c are opened and closed. Each of these shutter blades 54
C is rotatably supported by the lens barrel 51 via a support bin 87, and an engagement hole 54a is provided at the base of the shutter blade 54c.
An operating pin 88 fixed to a shutter ring 86 is engaged with the engagement hole 54a, and the rotation of the shutter ring 86 opens and closes the shutter blades 54c.

The shutter ring 86 always has its protrusion 86b aligned with the lens barrel 51.
It is set so as to come into contact with a stopper 89a fixed to the side, and the stopper 89b serves as a position control during the opening operation.

A contact piece 54b is formed on the shutter blade 54c, and the photocoupler 9 detects the operation of this contact piece 54b.
Performs shutter control time management and detects shutter abnormalities.

Parallax correction mechanism As shown in FIGS. 10 and 11, the light-receiving side AF lens 71 rotates in the direction of the arrow with respect to the front base plate 17 using the support bin 180 as a fulcrum as the photographing lens 50 is extended, thereby correcting parallax. Correction is possible. One side of the support bin 180 has a support portion 71a for the light-receiving side AF lens 71.
A spring 181 is installed between the support portion 71b and the front base plate 17, and a correction spring 183 is installed between the support portion 71b and the parallax correction bin 182 on the other side. The parallax correction bin 182 pushes the light receiving side AF lens 71 via the correction spring 183 by moving the lens barrel frame 22 together with the lens barrel 51 in the optical axis direction. On the upper part of the light-receiving side AF lens 71, there is a parallax, 2. An adjustment lever 185 is attached, and the protrusion 71C of the light-receiving side AF lens 71 comes into contact with this parallax adjustment lever 185 to regulate the rotation position, and the lens barrel 51 is moved between the initial position Y2 for normal photography and the initial position Y2 for close-up photography. Parallax correction for perspective switching is performed while moving between positions Y4.

Shooting mode change mechanism In the camera of this embodiment, when the release button 2 is pressed, a series of operations related to photographing start, and the exposed film winds up one frame and ends. Lullies switch s1
is turned ON, and in the subsequent stroke, the second release switch s2 is turned ON. The th Lurie's switch s1.

When the time reaches N, shooting preparation operations such as distance measurement to measure the subject distance and photometry to measure the subject brightness are performed, and when the second release switch s2 is turned on, the shutter opens and closes.
Photography and post-photography processing operations such as film winding are performed.

The closest shooting distance of general cameras is often set to about 0.6 to 1°2m, but with the camera of this example,
A normal photography mode and a close-up photography mode are provided in order to enable photographing of objects at a closer distance, so-called close-up photography, and to expand the photographable distance range. In the normal shooting mode, it is possible to shoot subjects from a predetermined normal shooting close distance to infinity (this range is called the normal shooting range), and in the close shooting mode, it is possible to shoot subjects from a predetermined normal shooting close distance to a predetermined close shooting distance. It is possible to photograph a subject up to a distance (this range is called a close-up shooting range), and the normal shooting range and the close-up shooting range are made to be continuous by matching the normal shooting range and the close-up shooting range. However, for example, three shooting modes, such as a close-range shooting mode, a medium-distance shooting mode, and a long-distance shooting mode, may be provided, or two shooting modes, such as a super close-up shooting mode, a close-up shooting mode, and a normal shooting mode, may be provided.
More than one shooting mode may be provided. The close-up button 3 is a button for switching shooting modes, and the close-up button 3 is a button for switching shooting modes.
When this button is pressed in the normal shooting mode where 1 is at the initial position Y2 for normal shooting, the close-up switch is turned on, the lens barrel 51 reaches the initial position Y4 for close-up shooting and stops, and the camera switches to the close-up shooting mode. Ru. When the camera is in close-up mode, press close-up button 3 to turn on the close-up switch.
Then, the lens barrel 51 retreats, reaches the initial position Y2 for normal photography, and stops, and the camera switches to the normal photography mode.

When the lens barrel 51 is at the collapsing stop position Y1 and the camera is in the carrying position, pressing the main switch button 4 turns the main switch ON, the power is excited, and the MAIN CPU 201, which will be described later, starts operating. A power hold is performed to maintain the excitation state of the power source, and the lens barrel 51 is extended and stops after reaching the initial position Y2 for normal photography, the camera enters the normal photography mode, and the power hold is released. When the camera is in the normal shooting mode or the close-up shooting mode, pressing the main switch button 4 turns the main switch ON, power is held in the same way as above, and the lens barrel 51 moves back and reaches the collapsing stop position Y1. It stops, Lamella assumes a mobile posture, and the power hold is released. Note that in conjunction with the extension of the lens barrel 51, the lens barrier 140 that covers the photographing window 55 opens, and the lens barrel 5
1, the lens barrier 140 closes to cover the photographing window and protect the photographing lens 5o.

Furthermore, when the camera is in the portable position, operations other than automatic film loading and film rewinding cannot be performed.

FIG. 14 is a schematic circuit block diagram of a camera to which the present invention is applied.

Cono camera has MAINCPU201 and 5UBCPU2
02 is used, and information is exchanged alternately through the serial interface. The MAINCPU 201 controls the drive system that requires a large current and executes the control sequence for the camera's shooting operation, and the 5UBCPU 202 drives the camera back unit 203f7) shooting information display section 122, and also provides switch information to the MAINCPU 201 to control the MAINCPU 201.
The PU 201 is made to perform various controls.

A power supply is connected to the DC-DC converter 204, and the DC-DC converter 204 is activated by power control from the 5UBCPU 202, which is activated when the main switch is turned on or the second release switch S2 is turned on. This causes the voltage Vdd to
201, and the MA I NCPU 201 is activated. A voltage Vcc is supplied from the DC-DC converter 204 to the control switches other than the release switches S1 and S2, the main switch, the close-up switch, and the mode selection switch, and a voltage Vdd is supplied as the power supply to each CPU, and the voltage of the lithium battery 8 is supplied. vb is 5UBCPU
202 and the strobe unit, and the voltage Vb' of the lithium battery 8 is a power source for a drive system that requires a large current. Furthermore, a DC-DC converter separate from the DC-DC converter 204 is provided in the strobe unit 205.

The activated MAIN CPU 201 contains analog information 20 including battery check information BC1, photometry information AV, temperature information TH for temperature compensation of the motor driver, and shutter trigger delay time information STD for correcting the shutter opening.
6 will be man-powered. This battery check information BC is transferred to the 5UBCPU 202 via a serial interface, and the 5UBCPU 202 displays this information as a battery remaining amount display 122a. Furthermore, MATNC
Switch information 207 of the DX switch, lens position switch, and AF trigger switch is input manually to the PU 201.

In addition, distance measurement information is captured as an analog signal from the AF unit 208, and if the distance measurement result is within the photographable distance range according to the shooting mode selected at that time,
A with F circle display control by MAINCPU201
The PLED is turned on, the CULED is turned on in the case of close-up shooting mode, and the LBLED is turned on when the subject brightness is below a predetermined value in the automatic flash mode, and these constitute the F white display 209. Then, a distance measurement completion and distance warning display 64, a close-up mode display 65, and a blip mark 66 are displayed in the finder. In addition, the AFLED blinks when the distance measurement result is outside the shooting distance range corresponding to the shooting mode selected at that time, and the LBLED lights up when the flash mode is on, and when the subject is not lit when the flash mode is off. Blinks when the brightness is below a predetermined value.

The MA I NCPU 201 is the second release switch S.
2 is turned ON, lens motor control is performed to control the lens motor driver 210 based on distance measurement information, and the motor 170 is driven to extend the photographic lens 50 and stop it at a predetermined position. At this time, the position of the photographing lens 50 is controlled based on the trigger information of the AF trigger switch, which is generated when the section 175 comes into contact with the main body side contact 175e or 175g, and the motor rotation speed information from the photocoupler 173. Since the photographic lens 50 is extended according to the distance measurement information, the trigger information from the AF trigger switch is used to set the base point Y3 or Y for the count of the amount of extension of the photographic lens 50.
5 (depending on the selected photographing mode), and control is performed to stop the motor 170 when it has rotated a predetermined amount from this counting base point Y3 or Y5. Then, according to the photometric information AV, shutter motor control is performed to control the shutter motor driver 211, and the motor 80 is driven to operate the shutter 54 and expose the film. At this time, the opening and closing of the shutter 54 is detected by the photocoupler 99.

When this exposure is completed, the lens motor driver 21
0 is driven, and the photographing lens 50 is set to the initial position Y2 or Y.
4 (depending on the selected shooting mode),
A film motor control is performed to control the film motor driver 212, and the motor 110 is driven to wind the film. At this time, while reading the switch information from the perforation switch 213, it is checked whether the film has been wound by one frame.

The 5UBCPU 202 sends a charging signal to the strobe unit 205, and the strobe unit 205 sends a charge completion signal to the 5UBCPU 202, thus performing EF control between the two. Light emission control of the strobe unit 205 is performed by the MAIN CPU 201, and the flash tube 100 emits light. The self-timer display 5 LED 214 is controlled by the external display control of the 5UBCPU 202.

The 5UBCPU 202 is driven by a coin battery disposed on the back cover 40, a voltage Vdd from the DC-DC converter 204, and a voltage vb from the lithium battery 8 via a backup circuit 215 and a reset circuit 216.

Further, switch information 217 such as a release switch, main switch, close-up switch, and back cover switch is input to the 5UBCPU 202, and a date module 218 is provided to the back cover unit 203, and this date module 218 includes a date mode switch, a select switch, etc. , switch information 219 from the set switch is input manually to drive the LCD to output a liquid crystal display drive signal for imprinting and displaying the date. Also 5UBC
The PU 202 outputs signals for driving the counter and other liquid crystal displays disposed on the back cover unit 203, and serves as a counter LCD drive.

In addition, the camera back unit 203 includes a mode selector switch 22.
0 is provided, and the mode can be switched manually.

Control circuit operation sequence Figure 15 shows the operation sequence of the circuit block of the present invention, including the sequence of MAIN CPU 201 and 5U.
It is divided into BCPU202 sequences.

The 5UBCPU 202 receives the IR by the reset signal ACL.
It is initialized in the subroutine, starts operating from the start, and monitors the input of information to the microcomputer from the MODE=1 determination. Then, when the 51-1 judgment turns on the Lurys switch S1, a film autoload error is determined by the flag ΦAL=1 judgment, and if the 51-1 judgment turns on and there is an autoload error, the ALS
The ub routine (2) displays an autoload error and ends. Also, the flag ΦREW-EN
If it is determined that D=1 and the film has finished rewinding, R
The process moves to the EWS u b routine (3), where the completion of film rewinding is displayed, and even if the first Lurie switch S1 is turned on, it will not operate unless the back cover is opened. Furthermore, if the flag Φ5TT=1 is determined and the shutter is abnormal, the process branches and does not accept the signal.

If these flags are not set, apply a power halt with PH←1 to start up the power, and then turn on the MAIN CPU.
Start 201. When the MAIN CPU 201 is started, the I10 port is set and the RAM is cleared using I10SET and RAMCLR, a battery check is performed in the BCSub routine, and DX switch information is read in the DXSub routine.

Read each of these pieces of information and use the serial interface on the SO to set the battery check information, DX switch information, and test information as 4-pit information.
Serially transferred to UBCPU202, BC display Sub
Display the remaining battery power in a routine. Here, if the remaining capacity of the battery 8 is less than a predetermined value, an error E is assumed and the operation is stopped.

If the remaining capacity of battery 8 exceeds a predetermined value, 5UB
So of CPU202, LD2 of MAINCPU201
In order to proceed to the Sub routine, information on the LD2Sub instruction is sent, and a branch 1 determination is made at the SI of the MAIN CPU 201. When the program moves to the LD2Sub routine, the lens position is checked and the collapsing stop position and the like are determined by flag φSEP.

In the LD2Sub routine, if the lens position is the initial position for normal shooting, the MAIN CPU 201
The process moves to branch 1 judgment. On the other hand, in the 5UBCPU 202, the lens position is the initial position for normal shooting, and the flag φ
If REW=1 is determined and rewinding is complete,
Then, the REWSub instruction information is transferred to the MAIN CPU 201 and the process ends.

If the camera back is open according to the camera back switch information in the 5b=o determination, the flag ΦALB is determined to be 1, and the process moves to the WSub routine where the MAIN CPU 201 determines the SI branch side.
Transfer WSub instruction information. If the counter is zero in the judgment of flag ΦC-0, it is judged whether the loaded film is a DX film or not by the judgment of flag φDX=1, and if it is a non-DX film, MAINC is set at SO.
The ALSub instruction information is transferred to the SI branch 2 determination of the PU 201, and the 5UBCPU 202 enters an autoload wait state, and the MAIN CPU 2C1l performs an autorot operation by the ALSub routine.

When the film is counted up, or when the counter is zero and it is a DX film, the information transferred by the LD2Sub lead is judged and the φ5EP
= 11, the lens barrel 51 is at the initial position for normal photography or close-up photography, so photography is possible, and when Φ5EP = OO, the lens barrel 51 is at the collapsing stop position, so the shooting ends and Φ5EP In the case of =01, the lens barrel 51 was extended but stopped at an undetermined position, so it is moved back and is at the retracted stop position, so the automatic light emission mode is returned to and the process ends.

When the lens barrel 51 is at the initial position for normal photography or close-up photography, the second release switch S2 is turned off in the 51-1 determination.
If it is F, charge the strobe main capacitor in the CHGSub routine, and if it is ON, the flag Φ
TEST=1 is determined, and if the test mode is set, test processing is performed, and if it is not the test mode, S.

transfer using the serial interface. Here,
MajnRout main routine instruction, flag φMO
The DE mode information and the counter information of the flag φC are 4-bit information and are transferred to the SI branch 2 determination of the MAIN CPU 201.

The 5UBCPU 202 is waiting in the AFSub routine, and the MAIN CPU 201 uses Sl to make a branch 2 determination, moves to the AESub routine, reads photometry information, further reads distance measurement information in the AFSub routine, and sends this distance measurement information to the 5UBCPU 202. AFSu
Transfer to routine b. This distance measurement information is R[AF] or R[CAF], where R[AF] is RAM information for distance measurement in normal shooting mode, and R[CAF] is RAM information for distance measurement in close-up shooting mode. The 4 bits are transferred twice.

Then, the 5UBCPU 202 waits for the second release switch S2 to be turned on with a 52-1 judgment, and the MAINCPU 201 uses the FLEDSub routine to turn on the AFLED for distance measurement, and also turns on the CULED in the case of close-up shooting mode. LBL when the subject brightness is lower than a predetermined value in lighting, automatic flash mode, or forced flash mode.
The ED will light up, and the APLED will blink if the distance measurement result is closer than the possible shooting distance range or if it is continuous, and the L
The BLED is in non-emission mode and blinks when the subject brightness is lower than a predetermined value.

When the second release switch S2 is turned ON by the 52=1 judgment of the 5UBCPU 202, the serial transfer port of 5in=1 changes the normal low state to the high state, and the 5in
Send in=1 information to MAINCPU201, 5UB
The CPU 202 waits 16m5 hours and sets Sin←O to ensure the transition from the FLEDSub routine of the MAIN CPU 201 to Sl, and then sets the flag Φ.
The MODE judgment determines whether the self-timer mode is active or not.

If not in self-timer mode, R[ST
D] Transfer the information to MAIN CPU 201 in 8 bits. This STD information is 8-bit information of the shutter trigger relay time film, and after winding the film,
Information is exchanged in the Sub routine, and the information is sent to M.
Read it with the W Sub routine of AINCPU201, transfer it to 5UBCPU202,
remembers this information and sends this information to MAINCP.
He is playing for U201. In the case of self-timer mode, transfer to 5ELFSub read-in and then transfer R[STD].

When this STD information is sent to MAINCPU201, S
After passing through I, the 5UBCPU 202 waits in the 5DSub routine, and the MAINCPU 201 determines whether or not the rso zone is 4 or higher, and if it is 15O400 or higher, DATET←1 is changed, and the lighting time for imprinting is changed. Then, DATEX←1 is set, and this signal is output for 5 ms as a signal for emitting light to imprint the date. When this signal is output, the light is emitted for about 10 ms and the date is imprinted.

When this is completed, initialize by setting DATEX←0 and DATET←0, and use the AFLDSub routine to initialize the shooting lens 5.
0 is fed out, and the shutter 54 is opened and closed in the 5DSub routine. If an activation signal for the shutter 54 is not received while the shutter 54 is opening or closing, a flag φSTT is output. If a failure occurs during the opening or closing process of the shutter, the flag Φ5TT=
1, and this information is sent to the 5UBCPU 202 to determine if there is a problem.

If there is no abnormality, the flag φ5TT is sent as 0, and MA
The INCPU 201 returns the photographing lens 50 in the LDRSub routine, moves to the WSub routine, and winds the film.

The 5UBCPU 202 uses the flag ΦMODE to determine whether or not it is in the self-time mode, and if it is not in the self-time mode, it shifts to the film winding of the WSub routine. In the case of self-timer Moto, the mode display is set to automatic light emission mode, the flag φMODE is set to automatic light emission mode, and then the process moves to winding of the WSub reachin film.

The operating sequence as described above takes place, but with 5 UBC
In the PU 202, when the PU202 starts operating from the start and before the second release switch S2 is pressed, it is determined whether the mode switch is ON or OFF in the MODE=1 determination, and if MODE is 1, that is, the mode switch is ON, the flag φ5TT=
1 judgment is used to determine shutter trouble, and in the event of an abnormality, no further signals will be accepted. If it is normal, the mode display is changed, and the mode information is also changed using the flag ΦMODE.The self-timer mode is determined using the flag ΦMODE.If it is not the self-timer mode, the mode switch is released when MODE=0. Wait for , and then return to the MODE=1 determination.

In the case of self-timer mode, set 1 to the timer with T”ls.
If the second is set and the mode switch is ON for 1 second or more when MODE=1 is determined, the feed display is evacuated when the Tover determination is made, the self display is set to 0FFL, and the rewind display is blinked. Then, in this blinking state, when the second release switch S2 is turned on with a judgment of 52=1, PH←1, Φ
As AL+-0, start the MAIN CPU 201, restore the feeding display, set the automatic light emission mode, turn off the feeding display, display a battery tick in the BC display sub routine, and set the Soi'REWSub instruction information to MA.
Serial transfer to INCPU201 and REWS u b
Manually rewind the film midway through the routine.

Furthermore, if the second release switch s2 is not turned on, if the MODE=1 determination indicates that the mode switch is OFF, the rewind display is turned off, the feed display is roughly restored, and the automatic flash mode is displayed. , flag ΦMOD
Set E to automatic flash mode and exit. If it is determined that MODE=1 and the mode switch is ON, it is waiting for the second release switch s2 to be turned ON.

Then, when the second release switch S2 is OFF in the 5UBCPU 202(7) S1=1 determination, when the main switch is turned ON and Scn+=1, the collapsing switch is performed. Here, the collapsible barrel switching flag ΦScu is 0, and the MAIN CPU 201 is activated by setting PH←1.

Also, turn on the close-up switch and 5cu=1
When this happens, close-up collapsing switching is performed and the sawdust switching flag is set to φScu←1.

MA I NCPU201 sends flag φBC1φDX,
After receiving the φTEST information, the BC display subroutine displays a battery check, and the So serial output displays the LD.
ISub instruction, flag φScu information is MAINCPU2
Transferred to 01. This information is the MAINCPU20
1+7) Sl(7) sent to branch 1 judgment, t, Dtsu
The lens barrel is driven in the b routine, and the flag φSEP information is transferred to the 5UBCPU 202, and the lens position is checked from this flag φSEP information in the LDISub routine. When the flag φ5EP=11, the lens barrel 51 is at the initial position for normal photography or close-up photography, and the strobe capacitor is charged in the CHGSub routine. When the flag φ5EP=OO, the lens barrel 51 is at the collapsing stop position, and when the flag Φ5EP=01, the lens barrel 51 has been extended but stopped at an undetermined position, so it has moved back and is at the collapsing stop position.
Normal shooting mode is selected, automatic flash mode is displayed,
The flag φMODE is set to automatic light emission mode and the process ends.

The 5BSub routine of the 5UBCPU 202 checks the status of the camera back at 1 second intervals, and monitors whether the camera camera back is opened based on the camera back switch information.

Next, the test mote will be explained. This test I mode is for checking the camera's performance, and tests are performed using the counter display on the back cover. Flag φTE
When ST=1 is determined, 5 LEDs are displayed in test mode←
By setting it to 1, the test mode is checked and 4 fi tests are performed: automatic flash mode, forced flash mode, non-flash mode, and self-timer mode. When the TEST1 information is transferred in automatic flash mode and the first Lurise switch S1 is ON, the zone information when metering is displayed, and when the second Lurise switch S2 is ON, the shutter is released and the automatic exposure mechanism is activated. Both photometric information and exposure amount information are tested.

TEST2 information is transferred in forced flash mode, and flashmatic is read from DX information. The DX information is displayed for each zone, and the aperture value can be controlled using Flashmatic according to the displayed information. In this test, the counter and feeding display are cleared and 5 LEDs are set to 0, and charging is performed using the CHGSub routine. In addition, the TEST3 information is transferred in the non-emission mode, the AF zone information is displayed with the second release switch S2, and the second release switch S2 drives the lens and extends it to the AF information. You can know the movement stroke.

TEST4 information is transferred in the self-timer mode, and a test is performed to see if the shutter is open using the Lullies switch S1.

These mode tests can be canceled with the mode switch.

Furthermore, in the 5tJBCPU202, when the flag φ5TT=1, the sequence of symbol C is entered, the transfer segment is saved, all segments are blinked for a predetermined period of time, and returned to lighting, and when 51=O judgment is made, the No. 1 Lurie's switch S1 is activated. Wait for it to finish.

Also, in the above operation sequence, the sequence from symbol 1 is to turn off power hold at PH←0 and wait for 200m5. rs 1 =O, MODE =O.

Finish with 5cn=0.5cu=O. Further, the sequence from symbol E is entered due to a battery abnormality, etc., and the flag ΦBC←oo is set to protect the battery, the battery is turned off, and the power hold is turned off in the same manner as described above, and the sequence ends.

Photographing Lens Flowchart FIG. 16 is an operation flowchart for moving the photographing lens, and FIG. 17 is a retraction time chart of the photographing lens.

Main switch 5 by operating main switch button 4
At WON, the power is held, the battery is checked, the DX code is read, and the data is transferred (
Steps 1-4). Then, a battery check is performed based on the battery information, and if the remaining battery level is less than a predetermined value, a battery warning is issued, the power halt is canceled, and the process ends (steps 5 to 7). If the remaining battery power exceeds a predetermined value, the remaining battery power is displayed and the lens barrel 5
A timer is set to limit the operation time of step 1, a hold signal PHM of the large current power source Vb' is outputted, and the lens barrel position is determined based on the value of the lens position signal SEP (steps 8 to 11).

When 5EP=1 and the lens barrel 51 is at the collapsing stop position, the lens barrel 51 is extended, and the timer is over before the lens barrel 51 reaches the initial position for normal shooting and the lens position signal SNP reaches 1. Then, turn off the Vb' power hold, power hold, and power hold to finish. When the lens position signal SNP becomes 1 within a predetermined time, a counter is set to determine the number of pulses, and a timer is further set to limit the pulse count time (steps 15 and 16). Then, from the output of the pulsed lens drive signal AFC by the photocube, AFC=1 and A
It is determined that FC=O, the number of pulses is counted, and when the set number of pulses is reached (steps 17 to 23), feeding is stopped (step 24). Next, turn vb' power hold to O.
The flash is turned FF, the main capacitor of the strobe is charged (steps 25 and 26), and the power is turned off.

Similarly, if AFC=1 or AFC=0 is not achieved within a predetermined time, feeding is also stopped. Next, the Vb' power supply hold is set to 0FFL/, the main capacitor of the strobe is charged, and the power is turned off to complete the process.

On the other hand, in step 11, when the lens barrel 51 is at a position other than the collapsing stop position in SEP 1, collapsing of the lens barrel 51 is started, the lens barrel 51 reaches the initial collapsing position, and the lens position signal is output. Move the photographing lens until SEP becomes 1. When the lens position signal SEP does not become 1 within a predetermined time, the process ends with (b) power hold and power hold OFF'. When the lens position signal SEP becomes 1 within a predetermined time (steps 27 to 29), a counter for setting the number of pulses is set, a timer is further set for limiting the pulse count time, and from the output of the lens drive signal AFC, Determine whether AFC=1 or AFC=0, count the number of pulses, and when the specified number of pulses is reached (
Steps 30 to 38), as shown in Fig. 17, rotate the motor in high-speed reverse direction, then apply the brake and cut off the power to stop collapsing and set the vb' power hold to 0FFI.
A predetermined initial mode is set and displayed, power hold is turned off, and the process ends (steps 39 to 41). If the AFC does not become 1 or 0 within the predetermined time, stop collapsing in the same way, turn off the vb' power hold, set and display the predetermined initial mode,
Release power hold and exit.

[Effects of the Invention] As mentioned above, the camera optical system control device of the present invention has the following effects:
The position information of the photographic lens is obtained, and when the moving photographic lens reaches the reference position, a position signal is output, and the movement is stopped after counting a predetermined number of pulses after reaching the reference position. Therefore, pulses can be counted from a predetermined reference position and accurately stopped at a predetermined position, and focusing accuracy is improved by using this position as the reference position of the photographing lens.

In addition, this stopping position is determined by counting the lens position signal generated by the contact pattern and the pulses generated by the movement of the photographing lens. By moving this electric circuit board and changing the position of the contact pattern, the photographing lens can be easily fixed. The reference position of can be changed.

Further, in this control means, the photographing lens is moved by the rotation of the motor of the moving means having a motor, and the pulses outputted by the rotation of the motor are counted by a predetermined number after detecting the position signal from the position detection means. If the motor of the lens moving means is reversed at high speed and then stopped by applying the brake and cutting off the power supply, it is possible to accurately stop the lens at a predetermined position without overrun or the like.

[Brief explanation of the drawing]

Fig. 1 is a schematic block diagram of the optical system control device of a camera according to the present invention, Fig. 2 is a plan view showing the lens position detection means, Fig. 3 is an operation time chart showing the movement of the photographing lens, and Figs. Fig. 9 shows a camera to which the present invention is applied, Fig. 4 is a front view of the camera, Fig. 5 is a rear view of the camera, and Fig. 6 is a rear view of the camera.
The figure is a plan view, Fig. 7 is a sectional view taken along the line ■-■ of Fig. 4, Fig. 8 is a view showing the finder display, Fig. 9 is a view showing the back cover display, and Fig. 10 is a view of the lens barrel. 11 is a cutting-judging surface view of FIG. 10, FIG. 12 is a cutting-judging surface diagram of FIG. 10, and FIG. is a schematic circuit block diagram of a camera to which this invention is applied, No. 15
The figure shows the operation sequence of the circuit block of this invention.
Figure 6 is an operation flowchart for moving the photographic lens, No. 17.
The figure is a storage time chart of the photographic lens. In the figure, reference symbol A is a photographing lens, B is a lens moving means, C is a control means, D is a distance measuring means, E is a pulse output means, and F is a lens position detecting means. Figure Figure Figure 12 Figure 13

Claims (1)

[Claims] 1. Lens moving means for moving the photographic lens in the optical axis direction, pulse output means for outputting pulses by the operation of the lens moving means, and a position signal for outputting a position signal when the photographing lens reaches a reference position. 1. An optical system control device for a camera, comprising: lens position detection means for outputting an output; and control means for counting a predetermined number of pulses after detecting a position signal and stopping movement of the photographing lens. 2. The lens moving means has a motor, and according to the rotation of the motor, pulses are generated from the pulse output means,
2. The camera according to claim 1, wherein the control means counts a predetermined number of pulses after detecting the position signal, reverses the motor at high speed, and then applies a brake to cut off the power to stop the movement of the photographic lens. Optical system control device.