JP2997752B2 - Camera focus control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens control device for a camera having a variable focus lens and a photographing lens whose focus position changes according to a change in focal length.

[0002]

2. Description of the Related Art In a camera comprising a variable focus lens and a photographing lens in which the focus position of the focus lens changes according to a change in focal length, zooming and focusing are controlled independently. In such a camera, zooming and focusing are simultaneously performed by operating a zoom operation member, for example, a zoom button.

[0003]

When the photographer selects a desired framing, the photographer may operate the zoom button continuously by 0N and 0FF to determine the photographing range. Each time the operation is performed, the focus lens is moved at the same time. For this reason, the focus lens reciprocates the same position many times, so that the drive of the focus lens is uselessly performed, and there is a problem that power consumption is increased.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide a camera lens control device that eliminates unnecessary movement of a focus lens and reduces power consumption.

[0005]

In order to solve the above-mentioned problems, a camera lens control apparatus according to the present invention comprises a photographic lens comprising a varifocal lens, wherein a focus position of the focus lens changes according to a change in an electrofocal distance. Zooming control means for driving the photographing lens to change the magnification by operating a zoom operation member, focal length detection means for detecting the focal length of the photographing lens after operating the zoom operation member, and elapse of a predetermined time based on the focal length A focus lens driving unit for changing the position of the focus lens later, wherein the operation of the zoom control unit is permitted during the operation of the zoom operation member, the operation of the focus lens driving unit is inhibited, and the operation of the zoom operation member is performed. The operation of the focus lens driving means is permitted later.

[0006]

According to the present invention, the focus lens after a lapse of a predetermined time (for example, about 0.5 seconds longer than the time required for the photographer to confirm the framing bear after the zoom operation and to perform the zoom operation again) Make a move. Therefore, since the focus lens is not moved at the same time as the zoom operation, useless movement of the focus lens is eliminated, and power consumption can be reduced.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. 1 to 3 show a camera to which the present invention is applied. FIG. 1 is a front view of the camera, FIG. 2 is a rear view of the camera, FIG. 3 is a plan view of the same, and FIG. is there. Camera Body A lens barrel 2 is provided at the center of the front of the camera 1, a finder 3 and a distance measuring and projecting window 4 are arranged above the lens barrel 2, and a strobe light emission window 5 is provided on a side of the finder 3. A distance measuring light receiving window 6 is arranged on a side of the distance measuring light projecting window 4. An LED display 15 is provided above the distance measuring light projecting window 4 and the finder 3.
The LED display unit 15 is blinked at a predetermined timing, for example, in order to notify the time at the time of self-photographing. Also, the LED in the direction corresponding to the distance measurement position of the distance measurement device
By turning on the display unit 15, the direction of the moving target can be confirmed from outside the camera. Also,
A photometric unit 16 is arranged above the lens barrel 2.

A large liquid crystal display unit 7 is provided on the upper part of the camera 1 so as to display a lot of photographing related information. Further, a main switch 8 and a release button 9 are provided. The switch S1 is turned on in the initial stroke of the release button 9 being pressed, and the switch S2 is turned on in the subsequent strokes. A back cover constituting the back of the camera 1 has a finder eyepiece window 10, a patrone confirmation window 11, various switch buttons 12 and operation buttons 1.
3 are provided. The operation button 13 moves the focal length of the zoom lens to the telephoto side by pressing the operation section 13a, and moves to the wide angle side by pressing the operation section 13b. The direction of the moving target is changed to the left side by pressing the operation unit 13d, and the direction of the moving target is changed to the right side by pressing the operation unit 13c. The operation button 13 is used for both of a zooming operation and a moving target operation.

[0009] The photographic lens photographic lens inner-focus type of zoom lens (Bali focus lens) is used. The lens configuration has a four-unit zoom. The zoom operation is an electric zoom drive system in which a zoom operation is automatically performed by pressing the operation button 13 described above.

A finder real image type zoom finder is used. Display in the viewfinder is performed by a display liquid crystal arranged on the real image plane in the viewfinder optical path, and a liquid crystal display method is used as shown in FIG. FIG. 4 shows a state in which all the segments are lit, and a field frame of automatic parallax correction for automatically setting a field of view based on focal length information of a photographing lens and subject distance information detected by a distance measuring operation. 20, a moving target mark 21, a strobe light emission mark 22, a distance measurement distance display 23, a camera shake warning mark 24, and the like for lighting a position corresponding to the distance measurement position of the distance measurement device capable of changing the distance measurement position are displayed.

[0011] As a focus adjustment distance measuring device, infrared light is projected from a light projecting element and is irradiated on a subject via a light projecting lens. 2. Description of the Related Art There is used an infrared active distance measuring device that receives reflected light from a subject via a light receiving lens to a light receiving element and detects a subject distance based on a light receiving position on the light receiving element. This distance measuring device can change the distance measurement position to the left and right with respect to the optical axis of the photographing lens. Such a method is called a moving target method.

When the switch S1 of the first-stage operation of the release button 9 is turned on, the distance measuring device is operated to hold the distance measurement result, and this distance measurement result is displayed on the distance measurement distance display 23 in the finder. When the distance is shorter than the predetermined distance, a warning display is displayed on the distance measurement display 23. When the switch S2 is ON, the focus lens is driven to focus on the basis of the distance measurement result. If the distance measurement result is shorter than a predetermined distance, the release lock is activated and the photographing operation is prohibited.

The light receiving section of the exposure control photometry device is composed of a two-division silicon photodiode, and has a spot photometry element for photometry at the center of the photographing screen and an average photometry element for photometry around the periphery other than the center. Exposure control suitable for a subject is performed based on subject brightness information and film sensitivity information detected by the two photometric elements.

The stroboscopic strobe device automatically accumulates the current boosted from the power supply in the capacitor by the completion of winding one frame of the film, turning on the main switch, and pressing the release button, and stops charging when the capacitor is charged to a predetermined voltage. The flash selection mode includes an automatic flash mode that determines whether or not the flash is fired based on the subject brightness information, a forced flash mode that fires the flash regardless of the brightness information of the subject, and a flash that fires regardless of the brightness information of the subject. There is a non-light emitting mode that is not performed.

The film feed feeding of the film is used the auto load method for a driving source known motor, the film feed is initiated and closing the back cover after film loading, perform preliminary feeding of the four frames. Also,
The film is fed by a spool drive system, and the number of frames is displayed on a counter in a sequential manner. The rewinding is automatically performed when the film tension at the time of feeding the film or when the end of photographing of the last frame is detected, or the rewinding is performed by manual operation of a single switch.

The lens barrel structure Figure 5 is a sectional view of a photographing lens barrel portion, FIG. 6 is a side view partially broken of the photographing lens barrel portion, FIG. 7 is a sectional view of a mechanism for driving the photographing lens, FIG. 8 is a sectional view taken along the line VIII-VIII in FIG. 5, FIG. 9 is a sectional view taken along the line IX-IX in FIG. 5, and FIG. 10 is a sectional view taken along the line XX in FIG.

The lens barrel 2 has a cylindrical fixed barrel 40 fixed to the front side of the body of the camera 1.
A plurality of sliding grooves 41 extending in the direction parallel to the lens optical axis α are formed on the inner peripheral surface of the lens 0. And this fixed lens barrel 4
0, a cylindrical front sliding frame 42 having a sliding projection 42a that can move in the direction of the lens optical axis α along the sliding groove 41 is disposed on the outer peripheral surface. Is fixed to a cylindrical movable lens barrel 43.

Similarly, a plurality of sliding grooves 4 extending in a direction parallel to the lens optical axis α are formed on the inner peripheral surface of the front sliding frame 42.
4 is formed. Inside the front sliding frame 42, a rear sliding frame 45 having a sliding protrusion 45a that can move in the direction of the lens optical axis α along the sliding groove 44 is projected on the outer peripheral surface. A fourth variable power lens group 46 composed of three lenses is incorporated inside the rear side of the rear sliding frame 45, and the fourth variable power lens group 46 is screwed to the inner periphery of the rear sliding frame 45. It is fixed with a ring screw 47.

Three lenses are attached to a partition 42b which partitions the inside of the front sliding frame 42.
Two lenses are attached to the rear side holder 48 which is arranged to face the lens, and these five lenses constitute a third zoom lens group 49a. A spring 50 is provided between the rear holder 48 and the rear sliding frame 45, and the rear sliding frame 45
The fourth variable power lens group 46 is always replaced by the third variable power lens group 49a.
Biased away from Two shutter blades 51 are interposed in the rear holder 48, and the shutter blades 51 are located between the third variable power lens groups 49a.

A front holder 52 is mounted inside the movable lens barrel 43, and a lens holder 53 is provided on the front side of the front holder 52 for fixing a first variable power lens group 49b composed of two lenses. It is screwed. The first variable power lens group 49b and the third variable power lens group 49a constitute a first to third variable power lens systems 49, which move together.

A guide groove 54 is formed inside the front holder 52 in the direction of the optical axis α of the lens.
Is engaged with a projection 56a of a lens holder 56 in which a second variable power lens group 55 composed of three lenses is incorporated. The support portion 56b of the lens holder 56 is slidably provided on the sleeve 57. The sleeve 57 is slidably inserted into a guide pin 58 made of stainless steel provided in the direction of the lens optical axis α, in a slidable manner,
This eliminates rattling of the lens and improves linearity. This guide pin 58 is used for the front side holder 5.
2 and a plate 66 supported by the front sliding frame 42.

A coil spring 59 inserted into a guide pin 58 is provided between the support portion 56b of the lens holder 56 and the tip of the front holder 52, and the second variable power lens group 5
5 is constantly biased in the direction of the third zoom lens group 49a.
A screw shaft 62 is rotatably supported between a bearing 60 provided on the front holder 52 and a bearing 61 provided on the partition 42 b of the front sliding frame 42.
Are parallel to the lens optical axis α direction. This screw shaft 6
A nut member 63 provided on a support portion 56b of the lens holder 56 is screwed to the lens holder 2 so that the second variable magnification lens group 55 can move in the lens optical axis α direction via the lens holder 56 by rotation of the screw shaft 52. Has become.

A small gear 64 is fixed to the screw shaft 62, and a large gear 65 is fixed to the shaft of the small gear 64. The large gear 65 meshes with a gear shaft 67 shown in FIG.
8 through the drive pinion 7 of the focusing motor 69
The second variable power lens group 55 is moved forward and backward in the direction of the lens optical axis α via the gear mechanism by driving of the focusing motor 69. On the other hand, a small gear 64 of the screw shaft 62 meshes with a large gear 72 provided on the gear shaft 71, and the gear shaft 71 engages a gear 73 a of a stopper member 73.
Are engaged with each other, and the stopper portion 73b of the concave portion 42c is formed in the partition portion 42b of the front sliding frame 42 in a fan shape about the axis of the stopper portion 73b.
The rotation of the second variable power lens group 55 is restricted by abutting on the end in the rotation direction. These gear mechanisms are supported between the plate 66 and the plate 75 on the partition 42b.

The rotating shaft 69a of the focusing motor 69
Are provided with three blades 76, and a pulse LDP1 is obtained by rotation of a focusing motor 69 by a photo interrupter 77 provided opposite to the three blades 76. A large gear 78 is provided on the shaft of the gear shaft 71, and a small gear 8 of a rotating shaft 80 rotatably provided on a plate 79.
The rotating shaft 80 is provided with a single blade 82. A photo interrupter 83 is provided at a position facing the single blade 82, and a focusing motor 69 is provided.
Pulse LDP2 is obtained by the rotation of.

The three blades 76 and the one blade 82 are formed of polyacetal which is a light-impermeable resin. By using polyacetal, it is possible to press-fit the rotary shaft 69a of the motor with light pressure, and it is also possible to easily adjust the position in the rotational direction after the press-fitting. FIG.
As shown in FIG.
The cam cylinder 90 is attached so as to be rotatable about zero.
A first correction cam groove 91 and a rear sliding frame 45 for extending the front sliding frame 42 and the movable barrel 43 in the direction of the lens optical axis α and correcting the extending amount according to the change in magnification.
A second correction cam groove 92 is formed for performing the extension in the direction of the lens optical axis α and the compensation of the extension amount according to the change in magnification. A front cam pin 93 projecting from the outer peripheral surface of the front sliding frame 42 has a lens optical axis formed on the peripheral wall of the fixed lens barrel 40 so as to be movable in the direction of the lens optical axis α in accordance with the rotational movement of the cam barrel 90. It penetrates a slot 94 parallel to α and projects into the first correction cam groove 91. Rear sliding frame 4
A rear cam pin 95 protruding from the outer peripheral surface of the lens barrel 5 is formed on the peripheral wall of the fixed lens barrel 40 in order to correct the difference between the amount of movement of the magnification adjusting lens of the viewfinder 3 and the amount of movement of the front sliding frame 42 and the movable lens barrel 43. The projection 96 passes through the slot 96 parallel to the lens optical axis α and the clearance groove 97 of the front sliding frame 42 and projects into the second correction cam groove 92.

A ring gear 98 is fixed to the outer peripheral surface near the base of the cam cylinder 90. A drive pinion 100 of a zoom drive motor 99 fixed to the camera body is connected to the ring gear 98 via a reduction gear train 101. Have been. Therefore, when the zoom operation is performed, the ring gear 98 and the cam barrel 90 are rotated to the wide-angle side or the telephoto side by the zoom drive motor 99 according to the operation direction, and the first to third variable power lens systems 49 are extended in the same direction. At the same time, the correction position of the fourth variable power lens group 46 according to the extension amount of the first to third variable power lens systems 49 is automatically determined.

The movable barrel 43 has a barrier 10 inside.
The movable lens barrel 43 is moved from the wide-angle end position to the storage position to move the barrier 103 from the open state shown in the figure to the closed state shown by a two-dot chain line, thereby protecting the photographing lens in the storage state. Perform Next, position control of an inner focus type lens (various focus lens) will be described in detail. This camera includes a zoom lens that changes the focal length of the focus lens by a zoom operation, moves the focus lens to a predetermined focus lens standby position after the zoom operation ends, and focuses after a predetermined time has elapsed from the end of the zoom operation. Control means for enabling the movement of the lens is provided. For this reason, the focus lens is not moved immediately after the zoom operation is completed, but is moved after a certain time elapses, and the zoom operation can be performed again before the certain time elapses. Therefore, when the photographer repeatedly operates the zoom button in a short period of time, the responsiveness of the zoom operation is improved, and the sound due to unnecessary movement of the focus lens is eliminated, and the power consumption can be reduced.

FIG. 11 shows a lens movement curve.
The horizontal axis shows the zoom rotation angle, and the vertical axis shows the distance from the focus plane. The first to third variable power lens systems 49 include a first variable power lens group 49b and a third variable power lens group 49a, both of which are connected and move integrally. The fourth variable power lens group 46 is located on the focus side, is linked with the first to third variable power lens systems 49 by the zoom cam mechanism, and extends the distance between them.

The second zoom lens group 55 is located between the first zoom lens group 49b and the third zoom lens group 49a.
It is moved by a focusing motor 69, which is a focusing actuator, and moves while changing the distance from the first to third variable power lens systems 49 or the fourth variable power lens group 46.
In the zooming control of the fourth variable power lens group 46, the rotation angle is 140 degrees from the wide-angle end to the telephoto end, and 24-step control is performed. One step is set to approximately 6 degrees.

FIG. 12 is a principle diagram of the zoom focus.
This figure shows the control of the focus lens of the second variable power lens group 55. The pulse LDP1 is obtained from the photo-interrupter 77 which detects the rotation of the three blades 76 as described above. This pulse LDP1 is used to maintain the precision of the feeding-out resolution of focusing, and to correct the pulse, for example, to adjust the focus position for each zoom. Is used to ultimately determine

The pulse LDP2 is obtained from a photo-interrupter 83 which detects the rotation of the single blade 82. This pulse LDP2 is used to determine a rough zoom zone to be moved by zooming, and is also a trigger pulse to start counting the pulse LDP1. Used as This pulse L
DP2 becomes 1 when 54 pulses of LDP1 are input.
A pulse is input.

A stop position for mechanically restricting the movement of the focus lens is set on both sides, and the focus lens moves during this time. In the retracted state, the focus lens is stopped at the front stopper position. The focusing motor 69 is controlled by the pulse LDP1 and the pulse LDP2, thereby performing focusing. In the drawing, movement to the left is motor reverse rotation, and movement to the right is motor forward rotation. The position indicated by the solid line of the focus lens is infinity wide-angle and infinity telephoto. The positions indicated by the broken lines are the wide angle 0.8 m and the telephoto 0.8 m, and the position indicated by the dashed line is the initial movement position, and is held at this position in the camera standby state.

Therefore, when the main switch is turned on,
The lens barrel in the housed state is zoomed to the wide end position, and the focusing motor 69 is energized in the reverse direction.
DP2 counts 5 pulses and stops. At that time, the camera enters the wide-angle shooting standby state from the stop position, which is the abutment in front of the focusing lens. As a result, the focus lens moves to the initial movement position for focusing indicated by the one-dot chain line. When the lens barrel is in the wide position, the focus is controlled forward from this position. When zoom drive is performed and the lens is moved to the telephoto end, the focus lens is zoom-focused from the initial position on the wide-angle side to the initial position on the telephoto side. When photographing is performed from this state, focus control is performed forward. In this embodiment, since the inner focus is used, the amount of movement of the focus lens differs between the telephoto side and the wide-angle side at the in-focus position with respect to the finite distance. Also,
When the focus lens is in the predetermined position on the wide angle side,
When the lens moves to the telephoto side, the position of the focus lens differs.

FIG. 13 is a diagram showing the principle of focus position correction. In the case of inner focus, focus position correction as shown in FIG. 13 is required. The subject distance is set to 0.8 m to infinity on the horizontal axis, and a numerical value for autofocus is set for the subject distance. The vertical axis shows the lens extension amount, about 160 pulses on the wide angle side and about 18 pulses on the telephoto side.
It is set with 0 pulse.

In this figure, the movement of the focus lens on the telephoto side is indicated by a solid line, and the movement on the wide angle side is indicated by a chain line. According to this, even if the infinity position is set on the wide-angle side and the telephoto side, when focusing on, for example, a 1.2 m subject, the amount of extension differs between the telephoto side and the wide-angle side. On the wide-angle side, the aperture is controlled in a narrowed state, and especially on the short distance side, in order to increase the resolution by controlling the aperture further, that is,
Since the position of the resolving power peak changes depending on the aperture value, the extension amount of the focus lens at the time of short-distance focusing aperture is supplemented.

The focus position correction is performed when the object distance is 1.2 m or more.
Until infinity, the drive pulse is P1 × AFZ / 128
When the object distance is in the range of 0.8 m to 1.2 m, the extension amount of the telephoto side drive pulse 1 is corrected by P1 + P2 (AFZ-128) / 64, and the wide angle side drive pulse is P1 + P2 ( The dispensing amount is corrected by (AFZ-128) / 64 + P3.

These pulse data are stored in the EEPROM at each of the 24 zooming stop positions from the wide angle side to the telephoto side. The infinite position is corrected by the pulse LDP2 and the shift pulse. FIG. 14 is a diagram showing an encoder for controlling the zoom position, and FIG. 15 is a timing chart of the zoom switch. FIG. 14 shows an encoder comprising a sliding resistance pattern for obtaining a signal for zoom control and a sliding contact piece.
The zoom position signal is obtained by using 0 and the sliding contact piece 310.

Sliding resistance pattern 300 and sliding contact piece 310
Is provided at a portion where the reduction gear train 101 for transmitting the power of the zoom drive motor 99 to the cam barrel 90 is arranged. The sliding contact piece 310 is fixed to the gear of the reduction gear train 101 to be rotatable, and the sliding resistance is reduced. The pattern 300 is disposed on the camera body side so as to face the sliding contact piece 310. Sliding contact piece 310
Rotates according to the extension of the lens, and slides on the sliding resistance pattern 300. The sliding resistance pattern 300 includes a first pattern 301, a second pattern 302, a third pattern 303, and a fourth pattern 304 from the inner peripheral side, and the sliding contact 310 includes a first contact 311, a second contact 312, Third contact piece 3
13 and a fourth contact piece 314.

The fourth pattern 304 is made of a sliding resistor, and the wide-angle end is set to GND and the telephoto end is set to 3 V. The first pattern 301 and the fourth pattern 3
04, the first contact piece 311 and the fourth contact piece 314 obtain an analog voltage zoom position signal ZI as shown in FIG.
The zoom position signal ZI is A / D converted, and the zoom zone ZZ is obtained from a table stored in an EEPROM as shown in Table 1. In this table, a zoom correction value FZ and a photometry correction value AE corresponding to the zoom zone ZZ are set.

A digital pattern is formed by the second pattern 302 and the third pattern 303, and the second contact piece 312 and the third contact piece 313 form a zoom close position signal ZC, as shown in FIG. A zoom wide-angle end signal ZW, a zoom telephoto end signal ZT, and a digital zoom movement pulse signal ZP are obtained. Therefore, when a zoom operation signal is input by operating the operation button 13, the zoom position signal ZI is A / D converted before the zoom operation for rotating the zoom drive motor 99, as shown in Table 1 below. Obtain the zoom zone ZZ. As a result, the current position of the focus lens is obtained, but the zoom wide-angle end signal ZW or the zoom telephoto end signal ZT is obtained.
Is input, the zone position [0] or [23] is obtained without A / D conversion.

Then, the zoom drive motor 99 is driven in response to the input of the zoom operation signal, and after the operation button 13 is released, stops at a predetermined position of the zoom movement pulse signal ZP. A / D conversion is performed on the zoom position signal ZI obtained at this time to obtain a zoom zone ZZ. The difference between the focus zone FZ of the zoom zone ZZ obtained before the zoom operation and the focus zone FZ of the zoom zone ZZ obtained after the zoom operation is obtained. Zoom focus is performed by the value obtained by this difference to change the focus lens position.

Table 1 ZI input table

[0043]

(A), (b), (c), (d) of FIG.
Is a timing chart of the zooming operation. FIG.
(A) and (b) of the drawing show timing charts at the time of zoom-up. FIG. 16A shows a zoom-up signal ZU by releasing the pressing operation of the operation unit 13a of the operation button 13 when the zoom movement pulse signal ZP is OFF.
Is turned from ON to OFF, the zoom movement pulse signal ZP
When the power is turned from OFF to ON, the energization of the zoom drive motor is switched from forward energization to reverse energization to stop the zoom drive motor at the ON position between the zoom movement pulse signals 3 and 4.

FIG. 16B shows a zoom-up signal ZU by releasing the pressing operation of the operation portion 13a of the operation button 13 when the zoom movement pulse signal ZP is ON.
Is turned from ON to OFF, the zoom movement pulse signal ZP
Wait for OFF, and when it turns from OFF to ON,
The energization of the zoom drive motor is changed from forward energization to reverse energization, and stop control is performed at an ON position between the zoom movement pulse signals 4 and 5.

FIGS. 16C and 16D are timing charts when zooming down. FIG. 16C shows the operation button 1 when the zoom movement pulse signal ZP is OFF.
When the zoom-down signal ZD changes from ON to OFF by releasing the pressing operation of the operation unit 13b of No. 3, the zoom drive motor energization switches from reverse energization to normal energization at the timing when the zoom movement pulse signal ZP changes from OFF to ON. And
At the timing when the next zoom movement pulse signal ZP changes from OFF to ON, the energization of the zoom drive motor is switched from forward energization to reverse energization, and the ON between the zoom movement pulse signals 8 and 9 is performed.
Stop control to the position.

FIG. 16D shows the zoom movement pulse signal Z.
By releasing the pressing operation of the operation unit 13b of the operation button 13 when P is ON, the zoom-down signal ZD is turned ON.
From OFF, the zoom movement pulse signal ZP is turned off.
F, the zoom drive motor is energized from the reverse rotation to the normal rotation at the timing from OFF to ON, and the zoom drive motor is energized from the normal rotation at the timing when the next zoom movement pulse signal ZP changes from OFF to ON. By turning on the reverse rotation, stop control is performed at the ON position between the zoom movement pulse signals 7 and 8.

As described above, the zoom stop is performed during the normal rotation drive by the zoom up signal ZU or the zoom down signal ZD.
Is input, the zoom movement pulse signal Z
As soon as P changes from OFF to ON, it stops. The accuracy of the zoom stop position can be improved by using only the position from the OFF state to the ON state in the normal rotation operation.

Before stopping the zoom, it is determined that the switch of the zoom movement pulse signal ZP is in the OFF state.
The motor control is performed at the timing of turning on, and chattering due to the control in the on state is eliminated. As a result, overrun of the zoom drive motor 99 during the chattering mask time can be reduced, thereby absorbing the moving speed dependency, the temperature dependency, and the individual difference of the mechanical mechanism. The stopping accuracy of the zoom drive motor 99 is improved.

During the reverse rotation, the motor is driven to the normal rotation side before stopping and then stopped. By performing this operation, the backlash generated in the mechanical mechanism can be absorbed and the motor is driven to the normal rotation side. Since the stroke has at least the pulse width of the zoom movement pulse signal ZP, the stroke for driving in the forward rotation direction is constant even if a voltage change occurs, and the motor stop accuracy can be improved.

Further, by applying a reverse current immediately before the stop, the brake is applied to reduce the overrun at the time of the stop, so that the temperature dependency can be absorbed. In addition, the battery voltage dependence due to the same potential in the forward and reverse directions can be absorbed. The time for igniting the reverse energization is controlled by the temperature of the outside air, the battery voltage, and the individual difference information. (A) and (b) of FIG.
(B) and (d) are auto-zoom timing charts showing the movement of the lens in the auto-zoom mode and moving the focal length by two pulses toward the telephoto side based on subject distance information. The zoom movement pulse signal ZP counts from OFF to ON. And plus one. FIG. 17A shows an example in which two pulses are moved to the normal rotation side. At the end of counting, a stop process is performed immediately as in the case of zooming up.

FIG. 17B shows an example in which two pulses are moved to the reverse rotation side. At the end of counting, as in the case of zooming down, the system waits for the zoom movement pulse signal ZP to be turned OFF, and turns OFF to OFF.
At the timing of N, the energization of the zoom drive motor is performed from the reverse rotation energization to the forward rotation energization, and the next zoom movement pulse signal ZP becomes O.
At the timing when the FF is turned on, the energization of the zoom drive motor is changed from forward energization to reverse energization and stopped.

Thus, by rotating the reverse side forward,
The same stop processing as that on the normal rotation side can be performed, and as described above, the zoom drive motor 99 is immediately stopped at the end of the pulse count without using a special chattering mask. It can be stopped, and overrun can be reduced. Therefore, the present invention is particularly suitable for an auto zoom in which a distance is automatically calculated and a zooming amount is changed according to the result.

FIG. 18 shows a focusing drive sequence. Focusing stop control is always performed in the direction in which the focus lens is extended forward, that is, the focusing motor 6.
It is activated and stopped on the forward rotation side of No. 9. The focusing motor 69 is driven to perform focusing, the count of the pulse LDP1 is started with the fall of the first pulse LDP2 as a trigger, and the stop control of the focusing motor 69 is started when the above-described predetermined pulse is input.

A short brake is applied to the focusing motor 69, a constant voltage reverse energization is performed for the reverse A time t1, and a constant voltage normal rotation energization is performed. Again, the short-circuit brake is applied, the constant voltage reverse energization is performed for the reverse B time t2, and the constant voltage normal energization is performed. further,
The constant voltage reverse energization is performed only for the reverse C time t3, and finally the motor is stopped for a predetermined time.

The reverse A time t1 depends on the number of control pulses. As shown in FIG. 13, the control pulse depends on the result of distance measurement, and the pulse LDP1 set as the motor rotation amount corresponding to the target rotation control amount depends on the shift pulse to obtain an infinite position. The setting of this control pulse differs between the telephoto side and the wide-angle side, and is set for each zoom zone ZZ. The reverse A time t1 becomes longer when there are many control pulses, and becomes shorter when there are few control pulses, and the reverse B time t2 and the reverse C time t
Numeral 3 sets a brake time according to the moving speed of the focus lens, performs stop control according to the moving speed of the focus lens, can always stop at a constant overrun, and reduces overrun.

As described above, the reverse A time t1 is set as shown in Table 2 depending on the control pulse. Table 2 Calculation of (t1)

[0058]

The reverse B time t2 is a short brake time, and the reverse A time t1 at which constant-voltage reverse rotation energization is performed.
In addition, it is set depending on the operation time of a constant, for example, 14 pulses (PA) input during the time of performing the constant voltage forward rotation energization. Further, the reverse C time t3 is set depending on the operation time of a constant, for example, 8 pulses (PB) input to the short brake time, the reverse B time t2 for performing the constant voltage reverse rotation energization, and the time for performing the constant voltage forward rotation energization. Is done.
The reverse B time t2 and the reverse C time t3 are as shown in Table 3, for example.

Table 3 Calculation of (t2) and (t3)

[0061]

The reverse A time t1 and the reverse B
The short brake time before the time t2 is, for example, 200 μm.
The brake time after the reverse time C is, for example, 200 m
In a second, the focusing motor 69 is set to be constant, and the focusing motor 69 is stopped in a shorter time by using the short brake.

As described above, the microcomputer 200
(FIG. 36) stop means for repeatedly stopping the focusing motor 69 by performing reverse braking and positive braking, and
Control means for setting the energizing time of the next brake based on the time required to energize a predetermined amount of movement by the reverse energizing and the positive energizing brakes, and perform the braking in accordance with the moving speed of the focus lens Therefore, the overrun amount can be made constant, and the focus lens can be stopped in a short time and with high accuracy.
The reverse A time t1, the reverse B time t2, and the reverse C time t3 are corrected based on temperature, power supply voltage, and individual difference information.

[0064] The shutter structure shutter structure, as shown in FIGS. 5 and 6, the photo-interrupter 102 for detecting the operation of the shutter blade 51 to the rear side holder 48 is provided, and the notch 51b~51e formed in the shutter blade 51 The first to fifth trigger signals are obtained with the tip 51f (FIG. 10).

As shown in FIG. 10, the shutter blade 51
It is designed to be driven by the operation of the operation pin 84,
The operating pin 84 is fixed to a lever 86 provided on a rotating shaft 85, and a tooth portion 86a formed on the lever 86 meshes with a drive pinion 88 of a shutter drive motor 87 constituted by a DC motor. When the shutter drive motor 87 is driven, the operating pin 84 is operated via the lever 86 to open and close the pair of shutter blades 51. Each of the shutter blades 51 is provided with a projection 89 of the front sliding frame 42.
The operating pin 84 is opened and closed by pushing its base 51a.

[0066] The shutter drive device Next, the drive of the shutter of the camera will be described in detail. FIG. 19 is an AE program diagram showing exposure control when a film having an ISO speed of 100 is used. Exposure control is performed based on two factors, shutter speed and aperture. The horizontal axis indicates the shutter speed, and the vertical axis indicates the aperture. When the film sensitivity is determined and the subject brightness is measured, an EV value which is an appropriate exposure value is determined, and a shutter speed and an aperture are set so as to obtain the EV value. In this program control, the EV value 3 to the EV value 18 are set in an interlocking range. is there. Since the zoom control is performed on this camera, when the focal length changes, the effective F-number changes, and F3.5 is obtained when the wide-angle side is fully opened, and F8.5 is obtained when the telephoto side is fully opened. On the wide angle side, a predetermined resolution cannot be obtained with F3.5, so F3.8 is used, and the wide angle side is not fully opened.

In this camera, an EV value of 18 or more cannot be measured by the capability of the photometric means.
Exposure control is carried out at a shutter speed of about 1/300 as 8; however, if a film having an ISO sensitivity of 400 is used, exposure control can be performed at a shutter speed of 1/500. Further, a range in which the strobe light emission control on the telephoto side and the wide-angle side is linked is indicated by a double line.

FIGS. 20 (a) to 20 (d) show the principle of automatic exposure amount correction. FIG. 20 (a) shows the exposure control of the standard shutter, and FIG. 20 (b) shows the operation of the shutter blades 51. FIG. 20C shows the exposure control of the standard shutter, and FIG. 20D shows the exposure control of the standard shutter.
Shows the exposure control when the operation of is slow. In (a) of FIG. 20, the shutter drive motor 87 composed of a DC motor that drives the shutter blades 51 by a release operation is reversely energized for a predetermined time t1 to remove the backlash of the machine and to move the shutter spring to the abutting position on the closed side. The shutter blades 51 are moved and energized at a high voltage for a predetermined time t2 to drive the shutter blades 51 in the opening direction, and thereafter energized at a low voltage for a predetermined time t3 to open the shutter blades 51. When the trigger signal ST is output when a predetermined aperture stop is obtained by the operation of the shutter blade 51, the shutter drive motor 87 is reversely energized for a predetermined time t4 to operate the shutter blade 51 in the closing direction. And stop. The opening area of the shutter blade 51 increases exponentially in accordance with the rotation amount of the shutter drive motor 87, and when a predetermined delay time t5 has elapsed from the reverse energization, the shutter blade 51 closes to obtain a predetermined exposure amount. it can.

By the way, as shown in FIG.
For example, when the rotation speed of the shutter drive motor 87 rises slowly, the operation of the shutter blades 51 slows down, so that the output of the trigger signal ST slows down, causing an error in the exposure amount. Therefore, as shown in FIGS. 20C and 20D, means for applying a high voltage and a low voltage when the shutter is opened to the shutter drive motor 87, and a plurality of triggers synchronized with the opening operation of the shutter blade 51. Means for obtaining a signal, and after the opening operation from the fully closed initial position by the first trigger signal ST0, after the opening operation from the fully closed initial position by the first trigger signal ST0 generated before the opening start point of the shutter blade. First
Means for supplying a high voltage until the falling of the first trigger signal ST0, and supplying a low voltage between the falling of the first trigger signal ST0 and the falling of the second trigger signal ST1. . The specific configuration of the means for obtaining a plurality of trigger signals in synchronization with the opening operation of the shutter blade 51 is shown in FIG. 10, and the first to fifth trigger signals ST are obtained.

Thus, as shown in FIG. 20C, for example, when the operation of the shutter blade 51 is standard,
The output time of the first trigger signal ST0 is short, and accordingly the energization time t2 at a high voltage is short. By the way, FIG.
As shown in (d), for example, when the operation of the shutter blade 51 is slow, the output time of the first trigger signal ST0 becomes long, and a high voltage is applied in accordance with the output of the first trigger signal ST0. The power is supplied at a low voltage for a predetermined time t3 until the power supply time t2 becomes longer and the reverse power is supplied by the fall of the second trigger signal ST1. As described above, by changing the energization time t2 of the high voltage applied to the shutter drive motor 87, a uniform exposure amount can be obtained. Therefore, variations in load due to individual differences such as the weight of the shutter blades 51 can be absorbed, and influences due to environmental factors such as temperature can be eliminated, and a highly accurate exposure amount can be obtained.

Further, the energizing time at a high voltage can be automatically set in accordance with the output of the first trigger signal ST0 obtained in synchronization with the opening operation of the shutter blade 51, and special adjusting means The exposure amount can be corrected by applying a high voltage corresponding to the shutter opening operation without using the shutter. FIG. 21 shows details of the correction of the exposure amount.
The solid line of 1 indicates the exposure amount of the standard shutter shown in FIG.
The broken line indicates the exposure amount when the operation of the shutter blade 51 in FIG. 20D is slow. In response to the output of the first trigger signal ST0, the high voltage energization time t2 of the DC motor is automatically adjusted, and the low voltage energization is performed at the fall of the first trigger signal ST0, and the second trigger Signal ST1
Reverse energization occurs at the falling edge of.

That is, when the load of the shutter drive motor 87 is large due to the exposure control by the shutter blade 51, the operation speed of the shutter blade 51 is slow, and the solid line shown in FIG. As compared with the case of the exposure control by the shutter blade 51 in (c), the slope of the exposure characteristic curve is gentler for both rising and falling, but the exposure is substantially the same by increasing the energization time t2 at a high voltage. Is corrected as follows.

FIGS. 22A to 22F show the shutter blades 5.
1 shows the operation state of the first embodiment. FIG. 22A shows a state when the motor is started, in which the first trigger signal ST0 is output, but the shutter drive motor 87 is not rotating, and the output of the first trigger signal ST0 is performed. , The shutter drive motor 87 is driven. In FIG. 22B, the shutter drive motor 87 rotates about 70 degrees, the lever 86 operates, and the shutter blade 51
Is activated, the second trigger signal ST1 is output, and the state immediately before the shutter opening is reached. In FIG. 22C, the shutter blade 51 is further operated to output a third trigger signal ST2, and the stop signal of the shutter blade 51 is controlled by using the trigger signal ST2 as a trigger, and the aperture is set to F5.6.
In (d) of FIG. 22, the shutter blade 51 further operates to output a fourth trigger signal ST3, and this trigger signal S
The stop control of the shutter blade 51 is performed using T3 as a trigger, and the aperture is set to F3.8.

In (e) of FIG. 22, the fifth trigger signal ST4
The stop signal of the shutter blade 51 is controlled using the trigger signal ST4 as a trigger to form an open aperture.
An aperture shown in FIG. 22F is obtained. By performing stop control of the shutter blades 51 at the time of full opening, it is possible to prevent the shutter blades 51 from bouncing at the time of full opening. can do. When the shutter blade 51 is fully opened, the shaft of the shutter drive motor 87 rotates about one rotation. The shutter drive motor 87 shown in this embodiment does not reach the saturation speed in about one rotation from the start, and the shutter opening operation depends on the start characteristics of the motor. Therefore, it can be used in a region with high responsiveness of forward rotation and reverse rotation.

FIGS. 23 (a) to 23 (d) show a shutter drive sequence, FIG. 24 (a) shows an energization time table, FIG. 24 (b) shows a braking time table, and FIG. The opening characteristic of the shutter blade 51 is shown. FIG. 23A shows the control at a high shutter speed.
9 shows shutter driving in areas A1 and A2 where the aperture value on the telephoto side and the wide-angle side and the shutter speed change. FIG. 23 (b) shows the shutter drive in a region B where the aperture value is constant at a short distance on the wide angle side and the shutter speed changes, and FIG. 23 (c) shows the aperture value at a long distance on the wide angle side. This shows shutter driving in a region C where the shutter speed is constant and changes. FIG. 23D illustrates shutter driving in a region D in which the aperture value is constant when the telephoto side is fully opened and the shutter speed changes.

The shutter drive motor 87 is shown in FIG.
It is driven by a trigger signal ST output from the shutter blade 51 as shown in (d). The shutter drive motor 87 is supplied with a high voltage from the start of the shutter drive, and is supplied with a low voltage at the falling edge of the first trigger signal ST0, and is switched to perform an opening operation. The exposure time control table energizing time t6 of the positive voltage applied to the shutter drive motor 87 is stored in, for example, a table 1 as shown in FIG.

In FIG. 23A, the second trigger signal ST
23, the falling of the third trigger signal ST2 in FIG. 23 (b), the falling of the fourth trigger signal ST3 in FIG. 23 (c), and the falling of the fourth trigger signal ST3 in FIG. 23 (d). Exposure control is performed using the fall of the trigger signal ST4 of No. 5 as a trigger. In (a) of FIG. 23, the reverse energization is performed for a predetermined time t7 after the elapse of the time of the table 2 using the falling of the second trigger signal ST1 as a trigger signal, and the predetermined time t8
The shutter blade is braked to obtain an opening characteristic X1 of the shutter blade having a triangular waveform as shown in FIG.

In FIGS. 23 (b) to 23 (d), stop control is performed, the trigger signal ST is counted, and adjustment is performed at the falling of the third, fourth, and fifth trigger signals ST2, ST3, and ST4. At time t9, reverse energization is performed to perform braking for a predetermined time t10, and then reversely energized for a predetermined time t11, and braking is performed again for a predetermined time t12, thereby obtaining opening characteristics X2, X3, and X4 of the shutter blade 51 having a trapezoidal waveform as shown in FIG.

The adjustment time t9 for reverse energization at the falling of the third, fourth, and fifth trigger signals is written in a storage means such as an EEPROM, and the adjustment time t9 differs for each F value. For the predetermined time t10 of the braking performed after the adjustment time t9, for example, as shown in FIG. 24B, a table 2 of a memory stored in advance is used, and the table 2 corresponds to each aperture. The exposure time table is shifted and used to simplify the information.

Further, the first trigger signal ST0 shown in FIGS. 23A to 23D is used as the flash timing of the flash control, and the interrupt control is performed from the first trigger signal ST0, so that the flash emission is performed. Done. The flash timing of the strobe is shown in FIGS. 23 (a) to (d), for example, the second, third, fourth and fifth trigger signals ST.
1, ST2, ST3, and ST4. 23A to 23D and the shutter blade opening characteristics X1, X2, X in FIG.
As indicated by 3 and X4, the triangular waveform is controlled by the time from the first trigger signal ST0, and the trapezoidal waveform is controlled by the subsequent trigger signals, whereby the exposure amount is controlled.

Means for obtaining a trigger signal ST corresponding to the aperture value in synchronization with the opening operation of the shutter blade 51, and detecting the trigger signal ST generated at the time of opening the shutter as aperture value information to stop driving the shutter drive motor 87. And a means for controlling the shutter blade 51 to close by a predetermined time after the drive of the shutter drive motor 87 of the DC motor is stopped. Therefore,
Trigger signals ST1, ST2, ST3, ST generated during opening of the shutter by driving the shutter drive motor 87
4 is detected as aperture value information, and the shutter drive motor 87
Is stopped to form an aperture, and after a predetermined time, reverse energization is performed to control the closing of the shutter blades.

By controlling the triangular waveform based on the time from the first trigger signal ST0, the table 1 storing the time is stored.
23, and as shown in FIGS. 23B and 23C, even if the F-number of the aperture increases, the time may be set in accordance with the F-number. can do. Further, by controlling the triangular waveform from the time from the first trigger signal ST0 and controlling the trapezoidal waveform by the time of braking or reverse energization by the subsequent trigger signal, program control of exposure priority or aperture priority is performed. And the exposure accuracy can be improved.

The stop control of the shutter blades 51 is shown in FIG.
6 (a) to 6 (c) may be adopted. In order to stop the shutter blade 51 accurately and stably, the braking effect is provided by changing the adjustment time and the energizing voltage. FIG. 26A shows adjustment times t14 and t15 of reverse energization.
FIG. 26 (b) is a graph in which the reverse energization voltage E1 is lowered. In FIG. 26 (c), the voltage E2 of the first reverse energization is increased, and the voltage E3 of the second reverse energization is decreased. In other words, a large variation may occur due to the acceleration at the time of sudden braking,
A gentle stop control can be performed by lowering the voltage E3 of the second reverse energization.

The distance measuring device of the camera has a variable distance measuring point, and the direction of distance measurement can be changed stepwise to the left or right by pressing an operation button. The photometric device also changes the photometric direction integrally with the distance measuring device. FIG. 27 is a plan view of the distance measuring photometer, and FIG. 28 is a cross-sectional view taken along line AA ′ of the distance measuring photometer.

A distance measuring light projecting unit 501, a distance measuring light receiving unit 502, and a light measuring unit 503 are provided near the front cover 500 of the camera, and each is attached to a distance measuring base 504. The distance measuring base 504 is inserted into a support shaft 506 provided on a moving target base 505 fixedly held on the main body, and is rotatable in the left-right direction with the support shaft 506 as a fulcrum. The directions of the distance measuring light projecting unit 501, the distance measuring light receiving unit 502, and the light measuring unit 503 are changed. The support shaft 506 is provided with a position regulating spring 507. One end 507a is engaged with a stopper 508 fixed to the moving target base 505, and the other end 507b is engaged with the distance measuring base 504. The play in the circumferential direction and the axial direction of the support shaft 506 is suppressed.

The distance measuring base 504 is provided with a connecting pin 509, which is engaged with a concave portion 510 a of the adjusting plate 510. The adjustment plate 510 is fixed to the drum 511, and when the drum 511 rotates left and right around the support shaft 524 as a fulcrum, the distance measurement base 504 is rotated by a predetermined angle in conjunction therewith. A long hole 510b is formed in the adjustment plate 510 in a circumferential direction around the support shaft 524 of the drum 511. A pin 511f of the drum 511 is inserted into the long hole 510b, and the positional relationship is adjusted by an eccentric pin 511g. The distance measurement position can be adjusted by changing the mounting position during assembly.

The operation groove 5 is provided at a position facing the drum 511.
11a and 511b are formed in two steps.
1a and 511b include a moving target base 50.
5 and a feed pawl 513, which is rotatably mounted on shafts provided at both ends 512a, 512b of a moving target lever 512 rotatably provided on the support shaft 523 of the fifth embodiment.
514, fixed claws 517 rotatably provided on the support shafts 515, 516 of the moving target base 505,
518 engage. Moving target lever 512
When one of them is pressed, the other feed claws 513, 5
Reference numeral 14 denotes an engagement portion with the action grooves 511a and 511b, and retreats and rises 517 of the fixed claws 517 and 518.
b, 518b are pressed, and the fixed claw also releases and retracts from the action groove.

The fixed claws 517, 518 are formed with downward stopper portions 517a, 518a on the drum side, and the non-drum side are formed with upward rising portions 517b, 518b. Springs 519 and 520 are provided on the support shafts 515 and 516, and one ends 519a and 520a thereof are fixed to the fixed claws 51.
7, 518, and the other end portions 519b, 520b are stoppers 521, 52 provided on the moving target base 505.
2 and the fixed claws 517 and 518
It is urged to engage with one of the action grooves 511a, 511b.

The moving target lever 512 is rotatably provided on a support shaft 523 of the moving target base 505. A return spring 528 is attached to the mounting shaft 550 screwed to the support shaft 523, and both ends 528 a of the return spring 528 are stoppers formed on the shaft 551 c of the mounting shaft 551 screwed to the support shaft 524. Part 5
The moving target lever 512 is always urged to return to the initial position via the stopper portion 512c.

A concave portion 511e is formed on the outer peripheral portion of the drum 511, and a center click plate 526 is formed in the concave portion 511e.
Are engaged with each other. The center click plate 526 is a moving target base 505.
To the center click plate 526
As a result, the drum 511 is held at the initial position, and the distance measuring light projecting unit 501, the distance measuring light receiving unit 502, and the light measuring unit 503 are at the center positions where they do not rotate.

On the other hand, the return spring 5 is provided on the shaft of the drum 511.
25, and both ends 525a of the return spring 525.
Is engaged with the shaft of the moving target lever 512, and the return spring 528 urges the drum 511 to always return to the initial position via the stopper 511c. The feed claws 513 and 514 urged by the springs 519 and 520 in the direction of the drum 511 so as to be rotatable at both ends of the moving target lever 512 are moved to the action grooves 511 a and 511 b of the drum 511 by the left and right rotation of the moving target lever 512. Engage the drum 511 by 1
Rotate step by step. Fixed claws 517, 518 are located below the feed claws 513, 514.

The moving target lever 512 is rotated left and right around the support shaft 523 by the operation button 13, and the rotation of the moving target lever 512 causes the feed pawls 513 and 514 in the rotation direction to rotate in the action grooves 511 a and 511 a of the drum 511. 511b is engaged and pushed. As a result, the drum 511 rotates and the fixed claws 517 and 51 in the rotation direction are rotated.
8 engages with the next action groove 511a, 511b of the drum 511, and moves the drum 511 to one-step action groove 511a, 511b.
Rotate for a minute and hold. At this time, the feed claws 513 and 514 in the non-rotational direction are raised by the rotation of the moving target lever 512 and the rising portions 517 b and 5 of the fixed claws 517 and 518.
18b, and the fixed claws 517, 518 are
520, the action groove 511a in the non-rotational direction
The engagement with 511b is released, and the drum 511 is made rotatable. When the moving target lever 512 returns to the initial position, the fixed claws 517 and 518
14 is released, the action groove 511 of the next stage is released.
a, 511b to restrict the rotation of the drum 511.

The protrusions 13e, 1 above and below the operation button 13
3f is provided with mounting portions 13g and 13h on the left and right, so that two operations of a zooming operation and a moving target operation are shared. That is, by pressing the operation portion 13a of the operation button 13, the protrusion 13e presses the contact piece 552a of the switch 552 formed of the elastic conductive rubber provided on the moving target base 505, and the control portion on the main body side. The pattern of the connected flexible printed circuit board is made conductive, and the focal length of the zoom lens is moved to the telephoto side.

On the other hand, when the operation portion 13b of the operation button 13 is pushed, the projection 13f presses the contact piece portion 552b to make the pattern of the flexible printed circuit board connected to the control portion on the main body conductive. Move the focal length of the zoom lens to the wide angle side. By pressing the operation section 13d of the operation button 13, the mounting section 13h is pressed.
Then, the left side of the moving target lever 512 is pushed, and the drum 511 rotates rightward via the feed claw 514, and the distance measurement base 504 rotates leftward, thereby changing the distance measurement and light measurement directions.

When the operation portion 13c of the operation button 13 is pressed, the right side of the moving target lever 512 is pushed by the mounting portion 13g, and
The drum 511 is rotated to the left via 13, and the ranging base 504 is rotated to the right, and the ranging and photometric directions are changed to the right. A recess 530a of a position detection lever 530 is engaged with a pin 529 provided on the drum 511, and the position detection lever 530 is rotatably provided on the support shaft 531. Reference numeral 532 slides on a pattern (not shown) to output rotation information of the drum 511, and obtain position information of the distance measurement base 504 in distance measurement control.

A release lever 533 is also provided on the support shaft 531 so as to be rotatable.
4 is provided, and operates in conjunction with the operation of the main switch 8 which can be taken by clicking two positions. A shaft portion 533a provided on the release lever 533 is engaged with a concave portion 535a of a release plate 535 rotatably provided on the shaft portion 511c of the drum 511, and the release plate 535 is rotated by operating the release lever 533. Rotates counterclockwise.

Therefore, when the main switch 8 is turned off, the operation of the main switch 8 causes the release lever 533 to rotate clockwise. Thus, when the release plate 535 rotates counterclockwise, the operating portions 535b and 535c
Are stoppers 517a, 518a of fixed claws 517, 518
Abuts and pushes. For this reason, the fixed claws 517, 518
Are springs 519 and 52 with support shafts 515 and 516 as fulcrums.
Rotating in the direction away from the action grooves 511a, 511b of the drum 511 against the zero. Thereby, the drum 511
Is released, the drum 511 is returned to the center initial position by the return spring 525, and the drum 51 is returned.
The click portion 526a of the center click plate 526 is engaged with the one concave portion 511e, and is held at this initial position. Therefore, when the main switch 8 is turned off, the moving target is always automatically returned to the center position, and preparation for the next photographing can be performed without performing any special operation.

[0098] distance measurement control Next, a description will be given of a moving target information set. FIG. 29 is a schematic diagram for obtaining moving target information from the distance measuring apparatus shown in FIGS. 27 and 28. FIG.
7 by the rotation of the drum 511 shown in FIG.
When the contact pieces 532 of the position detection lever 530 are connected to the patterns 0 to 4 in FIG. 29, the analog voltage MVI is obtained according to the patterns 0 to 4. This analog voltage MVI is A / D converted and this A / D
Distance measurement direction position information MVZ is obtained from the D value.

In this embodiment, the distance measurement direction position information MVZ
Is 6.6 degrees to the left when is 0, 3.3 degrees to the left when MVZ is 1
When MVZ is 2, center, when MVZ is 3, right 3.3 degrees,
When the MVZ is 4, it can be detected that the swing angle of the distance measuring device is 6.6 degrees to the right. The moving target position information MV is selected from the moving target table shown in Table 4 based on the distance measurement direction position information MVZ and the focal length information ZZ.

Table-4

[0101]

Based on the selected moving target position information MV, the display in the finder shown in FIG. 4 is turned on by selecting one of the 1 to 13 LCDs from the left. In this way, by performing display in the viewfinder, it is possible to easily confirm which position is being measured from outside. In this embodiment, the swing angle of the distance measuring device can be switched in two steps left and right around the optical axis of the taking lens.
By moving the photographic lens optical system by zooming,
At a deflection angle other than the optical axis center, a deviation occurs between the moving target frame display in the viewfinder and the distance measuring point of the distance measuring device. This shift occurs because the magnification in the finder also changes with the change in the focal length due to zooming, but the deflection angle of the distance measuring device does not change. This correction is performed by changing the display position of the moving target mark 21 in the finder. By changing the distance, the distance measurement point and the display of the moving target mark 21 can be made to correspond to each other, thereby making it possible to eliminate a change in the distance measurement range in telephoto and wide-angle.

Further, an information set for parallax correction will be described. The parallax correction corrects that the shooting range of the shooting lens does not match the shooting range of the viewfinder. The parallax correction is performed by turning on a plurality of field frames 20 corresponding to shooting distances arranged in the viewfinder optical system and a light source. When the photographing distance is measured by the finder display means for displaying the field of view frame 20 and the distance measuring means, the lighting display means is driven from the distance measuring zone information AFZ and the focal length information ZZ to drive the field of view frame 2
And control means for selecting and displaying 0. Under the condition that only the focal length information ZZ is inputted, the control means selects a field frame 20 having a small display change due to a change in the focal length among a plurality of field frames 20. It is configured to be displayed.

(1) to (3) of FIG. 30 show the display in the finder when three view frames are provided.
The parallax display state in which the visual field range is controlled by the blinking of 20b is obtained by obtaining distance measurement zone information AFZ based on the object distance information X, and using the distance measurement zone information AFZ and the focal length information ZZ as parameters in Table-5. It is selected from the flux correction table.

Table-5

[0106]

That is, when the distance measurement zone information AFZ is 0 to 63, the correction of (1) in FIG. 30 is performed irrespective of the focal length information ZZ, and the distance measurement zone information AFZ is 64 to 127.
30 when the focal length information ZZ is on the telephoto side,
Is corrected, and the AFZ information AFZ is set to 1
In the case of 28 to 192, the correction of (2) in FIG. 30 is performed when the focal length information ZZ is 8 to 15, and when the focal length information ZZ is 16 to 23, the correction in (3) of FIG. Correction is performed.

As described above, the plurality of field frames 20a and 20b corresponding to the photographing distances arranged in the finder optical system,
Display means in the viewfinder for turning on the light source to display the field frames 20a and 20b, and control means for driving the display means in the viewfinder from the distance measuring zone information AFZ and the focal length information ZZ when the photographing distance is measured by the distance measuring means. And distance measuring zone information AFZ based on the subject distance information X.
And the distance measurement zone information AFZ and the focal length information Z
Z is selected from the parallax correction table in Table-5. However, under the condition that only the focal length information ZZ is input, for example, when the focal length information ZZ is 0 to 7, the field frame (1) in FIG. 30 is selected, and the focal length information ZZ is selected.
Is 8 to 15, the field frame (1) in FIG. 30 is selected. If the focal length information ZZ is 16 to 23, the field frame (2) in FIG. 30 is selected, and a plurality of field frames (1) are selected. )-(3)
Of these, a field frame having a small display change due to a change in focal length is selected and displayed.

The conditions under which only the focal length information ZZ is input include, for example, when the main switch is turned ON, or until the switch S1 of the release button is pressed after zooming. FIG. 31 shows a method for correcting a distance measurement error due to a change in the refraction angle of the distance measurement light transmitted through the dustproof panel surface by changing the distance measurement direction. A dustproof panel 600 for protecting the distance measuring unit and the like is provided in front of the distance measuring device. The dustproof panel 600 is fixed to the camera case side and does not move due to a change in the distance measuring point. Therefore, as shown in FIG. 31, the ranging light projected from the light emitting element 601 to the subject 602 is:
The refraction when transmitting through the dustproof panel 600 changes depending on the shake angle α in the distance measurement direction. Due to this, the AF lens 6
An error x occurs on the PSD distance measurement surface of the light receiving element 604 via the light receiving element 03, and accurate distance measurement results cannot be obtained.

For this reason, as shown in FIG. 31, changes in the error x due to the deflection angles θ and α are obtained in advance and stored in a table as described below.

[0111]

Here, t 'is the distance between the optical axis and the AF lens.

[0113]

Obtained by Next, when the refraction angle θ ′ of the dustproof panel 600 is obtained,

[0115]

Here, n is the refractive index of the dustproof panel 600, for example, about n = about 1.5. This dustproof panel 6
The error x0 due to the refraction of 00 is

[0117]

Is obtained. Further, the distance x1 between the distance measuring light due to refraction in the dustproof panel 600 and the distance measuring light that does not refract is:

[0119]

Obtained by Therefore, the PS of the light receiving element 604
The error x on the D ranging surface is

[0121]

Is obtained. In this way, means for obtaining position information in the distance measurement direction and means for correcting the distance measurement information based on the position information in the distance measurement direction are provided, and are stored in advance based on the position information in the distance measurement direction. By correcting the distance measurement information from the table, the distance measurement error caused by the change in the refraction of the distance measurement light transmitted through the dustproof panel due to the deflection angle in the distance measurement direction can be removed, and accurate distance measurement results can be obtained. obtain. The light flux of the light projected by the distance measuring device is also refracted by the dustproof panel 600. This correction may be performed by adjusting the moving target mark 21 in the viewfinder in advance by the amount of deviation of the light beam caused by the refraction.

Photometric Control Next, photometric control will be described. FIG. 32 is a timing chart of photometry. As shown in FIG. 32, the photometric control is performed by controlling a spot / average photometric switching signal S / A, a measurement start command signal CA, a measurement start signal CB, and a measurement stop signal AEI. And the average time AVT.

In this photometric control, spot photometry is performed when the spot / average photometric switching signal S / A is at the L level, and average photometry is performed when the spot / average photometric switching signal S / A is at the H level. When the operation of the routine before the photometry routine ends, the photometry routine starts, and after a predetermined time for stabilizing the power supply voltage, the measurement start signal CB becomes H level, and the discharge of the capacitor set to the reference voltage is performed for a predetermined time. After the lapse of time, the measurement start command signal CA is set to the H level, the timer T is operated, and the charging of the capacitor whose charging time is changed according to the amount of light received by the photometric element for spot photometry is started. When the reference voltage is reached, the measurement stop signal AEI becomes H level, and the spot photometry time SPT is measured by the number of loops of the timer T during this time.

Next, the spot / average photometry switching signal S / A is set to the H level, and after a predetermined time for stabilizing the power supply voltage, the measurement start signal CB is set to the H level, and the capacitance of the capacitor set to the reference voltage is set. The discharge is performed for a predetermined time, and after the elapse of this time, when the measurement start command signal CA becomes H level, the timer T is activated and the charging time changes according to the amount of light received by the average photometry element. By starting charging and detecting that the reference voltage has been reached, the measurement stop signal AEI is set to the H level, and the average time AVT is measured by the number of loops of the timer T during this time.

Next, the photometric calculation correction will be described. The spot photometry time SPT and the average photometry time AVT are proportional to the brightness.
If it is short, it is determined to be bright, and this photometric characteristic is shown in the graph of FIG. 33 for the average photometric time AVT, for example.
In FIG. 33, the value of EVAV calculated by multiplying the EV value calculated from the number of loops of the timer T by 5 to determine the EVAV is set on the vertical axis, and the average photometry time AVT is set on the horizontal axis. It can be shown by the standard characteristics of the solid line.

By the way, if an error characteristic shown by a dashed-dotted line or a two-dot dashed line may occur due to a variation in an external resistor, a capacitor, or the like of the photometric IC, the error characteristic is adjusted to the standard characteristic. Photometric calculation correction is performed.
However, photometric correction to match this error characteristic to the standard characteristic is difficult to correct by hardware such as providing a resistor for correction, because the number of parts increases, automation is difficult, and adjustment man-hours are required. There is a problem.

The average photometry time A in FIG.
Since the relationship between VT and the number of loops of the timer T is as shown in the graph, the error characteristic can be matched with the standard characteristic by selecting the loop time of the timer T for measuring the average photometry time AVT. . That is, in order to measure the average time AVT, 248 is used for one loop standard.
By turning on the timer of μsec, the average photometry time AV
The measurement is performed by the number of loops in which the timer T rotates during T.
For this reason, for example, a timer of 232 μsec per loop is selected for the error characteristic of the one-dot chain line in FIG. 34, and a timer of 264 μsec is selected for the error characteristic of the two-dot chain line.

Thereby, the EVAV and the timer T shown in FIG.
Can be adjusted to the control characteristic as shown in the graph of the relationship of the number of loops. This photometric control is performed using a table in which the control characteristics shown in FIG. 35 are obtained. The control characteristics are obtained from the average photometric value EVAV based on the photometric time AVT as follows.
Seeking. EVAV = EVSFT−the number of loops of the timer T Here, EVSFT indicates the shift amount and E
The data (0 to 127) in the EPROM is used to shift-adjust the vertical deviation from the standard characteristic. Timer T is stored in EEPROM as shown in Table-6.
Is determined by the data EVLEN. Table-
6

[0130]

Therefore, by selecting EVLEN, the error of the inclination characteristic can be corrected, and by selecting EVSFT, the error of the vertical shift characteristic can be corrected. For example, as shown in FIG. When the error characteristic shown in FIG.
When μsec sometimes has an error characteristic as indicated by a two-dot chain line, the timer T264 μsec is selected and corrected.

As described above, even if the average photometry time AVT may deviate from the standard photometry characteristics, the loop time of the timer T may be changed to match the standard photometry characteristics without adjusting the hardware. , Standard photometric characteristics can be obtained. Also, the EV stored in the memory
Since the error of the inclination characteristic is corrected by selecting the LEN data, and the error of the vertical shift characteristic is corrected by selecting the EVSFT data in the same manner, the photometric characteristic shown in FIG. 35 is obtained. Often, there are advantages such as a reduction in memory capacity and a reduction in processing time.

Circuit Configuration of Camera FIG. 36 is a schematic block diagram of a camera. This camera uses a microcomputer 200 and a battery 201.
From the drive voltage. A storage means 202 capable of rewriting information is connected to the microcomputer 200,
Further, various switches and peripheral devices are connected to the microcomputer 200. As various switches,
There are a main switch 8, a moving switch 203 operated by the operation button 13, a tele side contact 204a and a wide side contact 204b of the zoom switch 204 operated by the operation button 13, a switch S1 and a switch S2 of the release button 9, and the like. In addition, as peripheral devices, display means 205 in the finder, photometric means 206, distance measuring means 207,
There are a zoom control unit 208, a lens barrel position detection unit 209, a lens control unit 210, a lens position detection unit 211, a shutter control unit 212, a feeding unit 213, and the like.

FIG. 37 is a flowchart showing the operation of the camera. In step 1-a, the input of the main switch 8 is determined. When the main switch 8 is turned on, zooming is performed by the zoom control unit 208 to move to the wide position (step 1-b).
With the drive of 5, the display of the field frame 20 with little change and the display of the moving target mark 21 on the liquid crystal display A are performed (step 1-c). Then, when the input state of the main switch 8 is determined and turned off (step 1-d), the camera is zoomed and moved to the closed position (step 1).
-E) Similarly, the liquid crystal display A is displayed, and step 1 is performed.
The process moves to -a (step 1-f).

In step 1-d, if the main switch 8 is ON, the input state of the zoom switch 204 is determined (step 1-g), and the zoom switch 204 is turned on.
Is turned on, the zoom control means 208 performs a zoom operation (step 1-h). Zoom switch 204 is off
When this is done (Step 1-i), the field frame 20 and the moving target mark 21 with little change are displayed on the liquid crystal display D (Step 1-j), and a predetermined time is set by a timer (Step 1-k). , The zoom switch 204 is O
When N is reached (step 1-1), the flow shifts to step 1-h to perform a zoom operation.

In step 1-1, if the time set by the timer elapses without turning on the zoom switch 204 (step 1-m), the focus lens is moved (step 1-n). -D
Move to. As described above, after the zoom operation is completed, the focus lens is not moved immediately, but is moved after a lapse of a predetermined time, and the zoom operation can be performed again before the lapse of the predetermined time. Therefore, when the photographer repeatedly operates the zoom button in a short period of time, the responsiveness of the zoom operation is improved, and the sound due to unnecessary movement of the focus lens is eliminated, and the power consumption can be reduced.

If the zoom switch 204 is OFF in step 1-g, the switch S1 of the release button 9 is
When N is reached (switch 1-o), photometry is performed by the photometry means 206 (step 1-p), distance measurement is performed by the distance measurement means 207 (step 1-q), and distance measurement information is stored (step 1-p).
r), furthermore, display of the field frame 20 and the moving target mark 21 by the distance measurement zone information AFZ and the focal length information ZZ on the liquid crystal display B in the viewfinder, furthermore, the flash emission mark 22, the distance measurement distance display 23, and the camera shake warning mark 2
4 is performed (step 1-s), and the input of the switch S2 of the release button 9 is determined (switch 1-t). If the switch S2 is not input, the display of the field frame 20 and the moving target mark 21 of the liquid crystal display B on the liquid crystal display C is continued (step 1-u), and the process proceeds to step d.

When the switch S2 of the release button 9 is inputted in step 1-t, focusing is performed by the lens control means 210 (step 1-v), and shutter opening / closing is controlled by the shutter control means 212. (Step 1-w) When the exposure is completed, the film is wound up by the feeding means 213 (Step 1-w).
x) Similarly, the liquid crystal display C is performed (step 1-u),
Move to step 1-d.

[0139]

As described above, the present invention includes the focus lens driving means for changing the position of the focus lens after a predetermined time has elapsed based on the focal length, and permits the operation of the zooming control means during the operation of the zoom operation member. The operation of the focus lens driving means is prohibited and the operation of the focus lens driving means is allowed after the zoom operation member is dried, and the focus lens can be moved after a predetermined time has elapsed from the end of the zoom operation of the photographer Therefore, the focus lens is not moved at the same time as the zoom operation.
Useless movement of the focus lens is eliminated, and power consumption can be reduced.

[Brief description of the drawings]

FIG. 1 is a front view of a camera.

FIG. 2 is a rear view of the camera.

FIG. 3 is a plan view of the camera.

FIG. 4 is a view showing a display in a finder.

FIG. 5 is a sectional view of a photographing lens barrel.

FIG. 6 is a side view in which a part of the photographing lens barrel is broken.

FIG. 7 is a cross-sectional view of a mechanism for driving a photographing lens.

FIG. 8 is a sectional view taken along line VIII-VIII of FIG. 5;

FIG. 9 is a sectional view taken along line IX-IX of FIG. 5;

FIG. 10 is a sectional view taken along the line XX of FIG. 5, showing signal detection means for controlling the shutter blades.

FIG. 11 is a diagram showing a lens movement curve.

FIG. 12 is a diagram illustrating the principle of zoom focus.

FIG. 13 is a diagram illustrating the principle of focus position correction.

FIG. 14 is a diagram illustrating an encoder for zoom position control.

FIG. 15 is a timing chart of a zoom switch.

FIGS. 16A to 16D are timing charts of a zooming operation.

FIGS. 17 (a) and (b) are diagrams showing the movement of the lens in the auto zoom mode of FIGS. 16 (b) and (d).

FIG. 18 is a diagram illustrating a focusing drive sequence.

FIG. 19 is an AE program diagram.

FIGS. 20A to 20D are principle views of the automatic exposure amount correction.

FIG. 21 is a diagram illustrating correction of an exposure amount in detail.

FIGS. 22 (a) to (f) are diagrams showing operating states of shutter blades.

FIGS. 23A to 23D are diagrams showing shutter drive sequences. FIGS.

24A is a diagram illustrating an energization time table, and FIG. 24B is a diagram illustrating a braking time table.

FIG. 25 is a diagram illustrating aperture characteristics of shutter blades.

FIGS. 26A to 26C are diagrams illustrating stop control of shutter blades.

FIG. 27 is a plan view of a distance measuring photometer.

FIG. 28 is a sectional view taken along the line AA ′ of the distance measuring / photometric device of FIG.

FIG. 29 is a schematic diagram of obtaining moving target information from the distance measuring apparatus shown in FIGS. 27 and 28.

FIGS. 30 (1) to (3) are views showing a field frame in a finder.

FIG. 31 is a diagram showing a structure for correcting distance measurement information by changing a distance measurement direction.

FIG. 32 is a timing chart of photometry.

FIG. 33 is a diagram showing average photometry characteristics.

FIG. 34 is a diagram showing the relationship between the average photometry time AVT and the number of loops of the timer T.

FIG. 35 is a diagram showing a relationship between EVAV and the number of loops of a timer T.

FIG. 36 is a schematic circuit block diagram of a camera.

FIG. 37 is an operation flowchart of the camera.

[Explanation of symbols]

 2 Lens barrel 8 Main switch 9 Release button 13 Operation button 200 Microcomputer 204 Zoom switch 206 Photometric means 207 Distance measuring means 208 Zoom control means 209 Lens barrel position detecting means 210 Lens control means 212 Lens position detecting means

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G02B 7/08 G02B 7/10 G02B 7/28

Claims (1)

(57) [Claims] A photographing lens comprising a variable focus lens, wherein a focus position of the focus lens changes in accordance with a change in focal length; a zooming control means for driving a magnification of the photographing lens by operating a zoom operation member; A focal length detecting unit configured to detect a focal length of the photographing lens after operating a zoom operating member; and a focus lens driving unit configured to change a position of the focus lens after a predetermined time has elapsed based on the focal length. The lens control of the camera, wherein during the drying operation, the operation of the focus control unit is prohibited by permitting the operation of the zoom control unit, and the operation of the focus lens drive unit is permitted after the operation of the zoom operation member. apparatus.